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	diff --git a/sys/contrib/openzfs/.github/ISSUE_TEMPLATE/bug_report.md b/sys/contrib/openzfs/.github/ISSUE_TEMPLATE/bug_report.md
	index 1dbb5f6edb55..92d0e03a9b9c 100644
	--- a/sys/contrib/openzfs/.github/ISSUE_TEMPLATE/bug_report.md
	+++ b/sys/contrib/openzfs/.github/ISSUE_TEMPLATE/bug_report.md
	@@ -1,53 +1,55 @@
	---
	name: Bug report
	about: Create a report to help us improve OpenZFS
	title: ''
	-labels: 'Type: Defect, Status: Triage Needed'
	+labels: 'Type: Defect'
	assignees: ''

	---

	<!-- Please fill out the following template, which will help other contributors address your issue. -->

	<!--
	Thank you for reporting an issue.

	IMPORTANT - Please check our issue tracker before opening a new issue.
	Additional valuable information can be found in the OpenZFS documentation
	and mailing list archives.

	Please fill in as much of the template as possible.
	-->

	### System information
	<!-- add version after "\|" character -->
	Type \| Version/Name
	--- \| ---
	Distribution Name \|
	Distribution Version \|
	-Linux Kernel \|
	+Kernel Version \|
	Architecture \|
	-ZFS Version \|
	-SPL Version \|
	+OpenZFS Version \|
	<!--
	-Commands to find ZFS/SPL versions:
	-modinfo zfs \| grep -iw version
	-modinfo spl \| grep -iw version
	+Command to find OpenZFS version:
	+zfs version
	+
	+Commands to find kernel version:
	+uname -r # Linux
	+freebsd-version -r # FreeBSD
	-->

	### Describe the problem you're observing

	### Describe how to reproduce the problem

	### Include any warning/errors/backtraces from the system logs
	<!--
	IMPORTANT - Please mark logs and text output from terminal commands
	or else Github will not display them correctly.
	An example is provided below.

	Example:
	```
	this is an example how log text should be marked (wrap it with ```)
	```
	-->

	diff --git a/sys/contrib/openzfs/.github/workflows/checkstyle.yaml b/sys/contrib/openzfs/.github/workflows/checkstyle.yaml
	index 8dcd5047a748..14a921099e30 100644
	--- a/sys/contrib/openzfs/.github/workflows/checkstyle.yaml
	+++ b/sys/contrib/openzfs/.github/workflows/checkstyle.yaml
	@@ -1,36 +1,50 @@
	name: checkstyle

	on:
	push:
	pull_request:

	jobs:
	checkstyle:
	runs-on: ubuntu-18.04
	steps:
	- uses: actions/checkout@v2
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	- name: Install dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install --yes -qq build-essential autoconf libtool gawk alien fakeroot linux-headers-$(uname -r)
	sudo apt-get install --yes -qq zlib1g-dev uuid-dev libattr1-dev libblkid-dev libselinux-dev libudev-dev libssl-dev python-dev python-setuptools python-cffi python3 python3-dev python3-setuptools python3-cffi
	# packages for tests
	sudo apt-get install --yes -qq parted lsscsi ksh attr acl nfs-kernel-server fio
	- sudo apt-get install --yes -qq mandoc cppcheck pax-utils devscripts abigail-tools
	+ sudo apt-get install --yes -qq mandoc cppcheck pax-utils devscripts
	sudo -E pip --quiet install flake8
	- name: Prepare
	run: \|
	sh ./autogen.sh
	./configure
	make -j$(nproc)
	- name: Checkstyle
	run: \|
	make checkstyle
	- name: Lint
	run: \|
	make lint
	- name: CheckABI
	+ id: CheckABI
	run: \|
	- make checkabi
	+ sudo docker run -v $(pwd):/source ghcr.io/openzfs/libabigail make checkabi
	+ - name: StoreABI
	+ if: failure() && steps.CheckABI.outcome == 'failure'
	+ run: \|
	+ sudo docker run -v $(pwd):/source ghcr.io/openzfs/libabigail make storeabi
	+ - name: Prepare artifacts
	+ if: failure() && steps.CheckABI.outcome == 'failure'
	+ run: \|
	+ find -name *.abi \| tar -cf abi_files.tar -T -
	+ - uses: actions/upload-artifact@v2
	+ if: failure() && steps.CheckABI.outcome == 'failure'
	+ with:
	+ name: New ABI files (use only if you're sure about interface changes)
	+ path: abi_files.tar
	diff --git a/sys/contrib/openzfs/.github/workflows/zloop.yml b/sys/contrib/openzfs/.github/workflows/zloop.yml
	index 30785b14507a..22c02b76e395 100644
	--- a/sys/contrib/openzfs/.github/workflows/zloop.yml
	+++ b/sys/contrib/openzfs/.github/workflows/zloop.yml
	@@ -1,67 +1,67 @@
	name: zloop

	on:
	push:
	pull_request:

	jobs:
	tests:
	runs-on: ubuntu-latest
	env:
	TEST_DIR: /var/tmp/zloop
	steps:
	- uses: actions/checkout@v2
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	- name: Install dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install --yes -qq build-essential autoconf libtool gdb \
	git alien fakeroot \
	zlib1g-dev uuid-dev libblkid-dev libselinux-dev \
	xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
	libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
	libpam0g-dev \
	python-dev python-setuptools python-cffi \
	python3 python3-dev python3-setuptools python3-cffi
	- name: Autogen.sh
	run: \|
	sh autogen.sh
	- name: Configure
	run: \|
	./configure --enable-debug --enable-debuginfo
	- name: Make
	run: \|
	make --no-print-directory -s pkg-utils pkg-kmod
	- name: Install
	run: \|
	sudo dpkg -i *.deb
	# Update order of directories to search for modules, otherwise
	# Ubuntu will load kernel-shipped ones.
	sudo sed -i.bak 's/updates/extra updates/' /etc/depmod.d/ubuntu.conf
	sudo depmod
	sudo modprobe zfs
	- name: Tests
	run: \|
	sudo mkdir -p $TEST_DIR
	# run for 20 minutes to have a total runner time of 30 minutes
	- sudo /usr/share/zfs/zloop.sh -t 1200 -l -m1
	+ sudo /usr/share/zfs/zloop.sh -t 1200 -l -m1 -- -T 120 -P 60
	- name: Prepare artifacts
	if: failure()
	run: \|
	sudo chmod +r -R $TEST_DIR/
	- uses: actions/upload-artifact@v2
	if: failure()
	with:
	name: Logs
	path: \|
	/var/tmp/zloop/*/
	!/var/tmp/zloop/*/vdev/
	if-no-files-found: ignore
	- uses: actions/upload-artifact@v2
	if: failure()
	with:
	name: Pool files
	path: \|
	/var/tmp/zloop/*/vdev/
	if-no-files-found: ignore
	diff --git a/sys/contrib/openzfs/META b/sys/contrib/openzfs/META
	index 9a39b0a59032..51218270a4ad 100644
	--- a/sys/contrib/openzfs/META
	+++ b/sys/contrib/openzfs/META
	@@ -1,10 +1,10 @@
	Meta: 1
	Name: zfs
	Branch: 1.0
	-Version: 2.1.0
	+Version: 2.1.1
	Release: 1
	Release-Tags: relext
	License: CDDL
	Author: OpenZFS
	-Linux-Maximum: 5.13
	+Linux-Maximum: 5.14
	Linux-Minimum: 3.10
	diff --git a/sys/contrib/openzfs/Makefile.am b/sys/contrib/openzfs/Makefile.am
	index 4e7e29589fc0..060729642533 100644
	--- a/sys/contrib/openzfs/Makefile.am
	+++ b/sys/contrib/openzfs/Makefile.am
	@@ -1,225 +1,235 @@
	include $(top_srcdir)/config/Shellcheck.am

	ACLOCAL_AMFLAGS = -I config

	SUBDIRS = include
	if BUILD_LINUX
	SUBDIRS += rpm
	endif

	if CONFIG_USER
	SUBDIRS += man scripts lib tests cmd etc contrib
	if BUILD_LINUX
	SUBDIRS += udev
	endif
	endif
	if CONFIG_KERNEL
	SUBDIRS += module

	extradir = $(prefix)/src/zfs-$(VERSION)
	extra_HEADERS = zfs.release.in zfs_config.h.in

	if BUILD_LINUX
	kerneldir = $(prefix)/src/zfs-$(VERSION)/$(LINUX_VERSION)
	nodist_kernel_HEADERS = zfs.release zfs_config.h module/$(LINUX_SYMBOLS)
	endif
	endif

	AUTOMAKE_OPTIONS = foreign
	EXTRA_DIST = autogen.sh copy-builtin
	EXTRA_DIST += config/config.awk config/rpm.am config/deb.am config/tgz.am
	EXTRA_DIST += AUTHORS CODE_OF_CONDUCT.md COPYRIGHT LICENSE META NEWS NOTICE
	EXTRA_DIST += README.md RELEASES.md
	EXTRA_DIST += module/lua/README.zfs module/os/linux/spl/README.md

	# Include all the extra licensing information for modules
	EXTRA_DIST += module/icp/algs/skein/THIRDPARTYLICENSE
	EXTRA_DIST += module/icp/algs/skein/THIRDPARTYLICENSE.descrip
	EXTRA_DIST += module/icp/asm-x86_64/aes/THIRDPARTYLICENSE.gladman
	EXTRA_DIST += module/icp/asm-x86_64/aes/THIRDPARTYLICENSE.gladman.descrip
	EXTRA_DIST += module/icp/asm-x86_64/aes/THIRDPARTYLICENSE.openssl
	EXTRA_DIST += module/icp/asm-x86_64/aes/THIRDPARTYLICENSE.openssl.descrip
	EXTRA_DIST += module/icp/asm-x86_64/modes/THIRDPARTYLICENSE.cryptogams
	EXTRA_DIST += module/icp/asm-x86_64/modes/THIRDPARTYLICENSE.cryptogams.descrip
	EXTRA_DIST += module/icp/asm-x86_64/modes/THIRDPARTYLICENSE.openssl
	EXTRA_DIST += module/icp/asm-x86_64/modes/THIRDPARTYLICENSE.openssl.descrip
	EXTRA_DIST += module/os/linux/spl/THIRDPARTYLICENSE.gplv2
	EXTRA_DIST += module/os/linux/spl/THIRDPARTYLICENSE.gplv2.descrip
	EXTRA_DIST += module/zfs/THIRDPARTYLICENSE.cityhash
	EXTRA_DIST += module/zfs/THIRDPARTYLICENSE.cityhash.descrip

	@CODE_COVERAGE_RULES@

	GITREV = include/zfs_gitrev.h

	PHONY = gitrev
	gitrev:
	$(AM_V_GEN)$(top_srcdir)/scripts/make_gitrev.sh $(GITREV)

	all: gitrev

	# Double-colon rules are allowed; there are multiple independent definitions.
	maintainer-clean-local::
	-$(RM) $(GITREV)

	distclean-local::
	-$(RM) -R autom4te*.cache build
	-find . \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
	-o -name .pc -o -name .hg -o -name .git \) -prune -o \
	\( -name '.orig' -o -name '.rej' -o -name '*~' \
	-o -name '.bak' -o -name '##' -o -name '.*.orig' \
	-o -name '..rej' -o -size 0 -o -name '%' -o -name '.*.cmd' \
	-o -name 'core' -o -name 'Makefile' -o -name 'Module.symvers' \
	-o -name '.order' -o -name '.markers' -o -name '*.gcda' \
	-o -name '*.gcno' \) \
	-type f -print \| xargs $(RM)

	all-local:
	-[ -x ${top_builddir}/scripts/zfs-tests.sh ] && \
	${top_builddir}/scripts/zfs-tests.sh -c

	dist-hook:
	$(AM_V_GEN)$(top_srcdir)/scripts/make_gitrev.sh -D $(distdir) $(GITREV)
	$(SED) ${ac_inplace} -e 's/Release:[[:print:]]*/Release: $(RELEASE)/' \
	$(distdir)/META

	if BUILD_LINUX
	# For compatibility, create a matching spl-x.y.z directly which contains
	# symlinks to the updated header and object file locations. These
	# compatibility links will be removed in the next major release.
	if CONFIG_KERNEL
	install-data-hook:
	rm -rf $(DESTDIR)$(prefix)/src/spl-$(VERSION) && \
	mkdir $(DESTDIR)$(prefix)/src/spl-$(VERSION) && \
	cd $(DESTDIR)$(prefix)/src/spl-$(VERSION) && \
	ln -s ../zfs-$(VERSION)/include/spl include && \
	ln -s ../zfs-$(VERSION)/$(LINUX_VERSION) $(LINUX_VERSION) && \
	ln -s ../zfs-$(VERSION)/zfs_config.h.in spl_config.h.in && \
	ln -s ../zfs-$(VERSION)/zfs.release.in spl.release.in && \
	cd $(DESTDIR)$(prefix)/src/zfs-$(VERSION)/$(LINUX_VERSION) && \
	ln -fs zfs_config.h spl_config.h && \
	ln -fs zfs.release spl.release
	endif
	endif

	PHONY += codecheck
	codecheck: cstyle shellcheck checkbashisms flake8 mancheck testscheck vcscheck

	PHONY += checkstyle
	checkstyle: codecheck commitcheck

	PHONY += commitcheck
	commitcheck:
	@if git rev-parse --git-dir > /dev/null 2>&1; then \
	${top_srcdir}/scripts/commitcheck.sh; \
	fi

	PHONY += cstyle
	cstyle:
	@find ${top_srcdir} -name build -prune \
	-o -type f -name '*.[hc]' \
	! -name 'zfs_config.' ! -name '.mod.c' \
	! -name 'opt_global.h' ! -name '_if.h' \
	! -path './module/zstd/lib/*' \
	-exec ${top_srcdir}/scripts/cstyle.pl -cpP {} \+

	filter_executable = -exec test -x '{}' \; -print

	SHELLCHECKDIRS = cmd contrib etc scripts tests
	SHELLCHECKSCRIPTS = autogen.sh

	PHONY += checkabi storeabi
	-checkabi: lib
	+
	+checklibabiversion:
	+ libabiversion=`abidw -v \| $(SED) 's/[^0-9]//g'`; \
	+ if test $$libabiversion -lt "180"; then \
	+ /bin/echo -e "\n" \
	+ "*** Please use libabigail 1.8.0 version or newer;\n" \
	+ "*** otherwise results are not consistent!\n"; \
	+ exit 1; \
	+ fi;
	+
	+checkabi: checklibabiversion lib
	$(MAKE) -C lib checkabi

	-storeabi: lib
	+storeabi: checklibabiversion lib
	$(MAKE) -C lib storeabi

	PHONY += mancheck
	mancheck:
	${top_srcdir}/scripts/mancheck.sh ${top_srcdir}/man ${top_srcdir}/tests/test-runner/man

	if BUILD_LINUX
	stat_fmt = -c '%A %n'
	else
	stat_fmt = -f '%Sp %N'
	endif

	PHONY += testscheck
	testscheck:
	@find ${top_srcdir}/tests/zfs-tests -type f \
	$ -name '*.ksh' -not ${filter_executable} $ -o \
	$ -name '*.kshlib' ${filter_executable} $ -o \
	$ -name '*.shlib' ${filter_executable} $ -o \
	$ -name '*.cfg' ${filter_executable} $ \| \
	xargs -r stat ${stat_fmt} \| \
	awk '{c++; print} END {if(c>0) exit 1}'

	PHONY += vcscheck
	vcscheck:
	@if git rev-parse --git-dir > /dev/null 2>&1; then \
	git ls-files . --exclude-standard --others \| \
	awk '{c++; print} END {if(c>0) exit 1}' ; \
	fi

	PHONY += lint
	lint: cppcheck paxcheck

	CPPCHECKDIRS = cmd lib module
	PHONY += cppcheck
	cppcheck: $(CPPCHECKDIRS)
	@if test -n "$(CPPCHECK)"; then \
	set -e ; for dir in $(CPPCHECKDIRS) ; do \
	$(MAKE) -C $$dir cppcheck ; \
	done \
	else \
	echo "skipping cppcheck because cppcheck is not installed"; \
	fi

	PHONY += paxcheck
	paxcheck:
	@if type scanelf > /dev/null 2>&1; then \
	${top_srcdir}/scripts/paxcheck.sh ${top_builddir}; \
	else \
	echo "skipping paxcheck because scanelf is not installed"; \
	fi

	PHONY += flake8
	flake8:
	@if type flake8 > /dev/null 2>&1; then \
	flake8 ${top_srcdir}; \
	else \
	echo "skipping flake8 because flake8 is not installed"; \
	fi

	PHONY += ctags
	ctags:
	$(RM) tags
	find $(top_srcdir) -name '.?*' -prune \
	-o -type f -name '*.[hcS]' -print \| xargs ctags -a

	PHONY += etags
	etags:
	$(RM) TAGS
	find $(top_srcdir) -name '.?*' -prune \
	-o -type f -name '*.[hcS]' -print \| xargs etags -a

	PHONY += cscopelist
	cscopelist:
	find $(top_srcdir) -name '.?*' -prune \
	-o -type f -name '*.[hc]' -print >cscope.files

	PHONY += tags
	tags: ctags etags

	PHONY += pkg pkg-dkms pkg-kmod pkg-utils
	pkg: @DEFAULT_PACKAGE@
	pkg-dkms: @DEFAULT_PACKAGE@-dkms
	pkg-kmod: @DEFAULT_PACKAGE@-kmod
	pkg-utils: @DEFAULT_PACKAGE@-utils

	include config/rpm.am
	include config/deb.am
	include config/tgz.am

	.PHONY: $(PHONY)
	diff --git a/sys/contrib/openzfs/cmd/vdev_id/vdev_id b/sys/contrib/openzfs/cmd/vdev_id/vdev_id
	index d349ba43ca90..cad59c93f078 100755
	--- a/sys/contrib/openzfs/cmd/vdev_id/vdev_id
	+++ b/sys/contrib/openzfs/cmd/vdev_id/vdev_id
	@@ -1,788 +1,789 @@
	#!/bin/sh
	#
	# vdev_id: udev helper to generate user-friendly names for JBOD disks
	#
	# This script parses the file /etc/zfs/vdev_id.conf to map a
	# physical path in a storage topology to a channel name. The
	# channel name is combined with a disk enclosure slot number to
	# create an alias that reflects the physical location of the drive.
	# This is particularly helpful when it comes to tasks like replacing
	# failed drives. Slot numbers may also be re-mapped in case the
	# default numbering is unsatisfactory. The drive aliases will be
	# created as symbolic links in /dev/disk/by-vdev.
	#
	# The currently supported topologies are sas_direct and sas_switch.
	# A multipath mode is supported in which dm-mpath devices are
	# handled by examining the first-listed running component disk. In
	# multipath mode the configuration file should contain a channel
	# definition with the same name for each path to a given enclosure.
	#
	# The alias keyword provides a simple way to map already-existing
	# device symlinks to more convenient names. It is suitable for
	# small, static configurations or for sites that have some automated
	# way to generate the mapping file.
	#
	#
	# Some example configuration files are given below.

	# #
	# # Example vdev_id.conf - sas_direct.
	# #
	#
	# multipath no
	# topology sas_direct
	# phys_per_port 4
	# slot bay
	#
	# # PCI_ID HBA PORT CHANNEL NAME
	# channel 85:00.0 1 A
	# channel 85:00.0 0 B
	# channel 86:00.0 1 C
	# channel 86:00.0 0 D
	#
	# # Custom mapping for Channel A
	#
	# # Linux Mapped
	# # Slot Slot Channel
	# slot 1 7 A
	# slot 2 10 A
	# slot 3 3 A
	# slot 4 6 A
	#
	# # Default mapping for B, C, and D
	# slot 1 4
	# slot 2 2
	# slot 3 1
	# slot 4 3

	# #
	# # Example vdev_id.conf - sas_switch
	# #
	#
	# topology sas_switch
	#
	# # SWITCH PORT CHANNEL NAME
	# channel 1 A
	# channel 2 B
	# channel 3 C
	# channel 4 D

	# #
	# # Example vdev_id.conf - multipath
	# #
	#
	# multipath yes
	#
	# # PCI_ID HBA PORT CHANNEL NAME
	# channel 85:00.0 1 A
	# channel 85:00.0 0 B
	# channel 86:00.0 1 A
	# channel 86:00.0 0 B

	# #
	# # Example vdev_id.conf - multipath / multijbod-daisychaining
	# #
	#
	# multipath yes
	# multijbod yes
	#
	# # PCI_ID HBA PORT CHANNEL NAME
	# channel 85:00.0 1 A
	# channel 85:00.0 0 B
	# channel 86:00.0 1 A
	# channel 86:00.0 0 B

	# #
	# # Example vdev_id.conf - multipath / mixed
	# #
	#
	# multipath yes
	# slot mix
	#
	# # PCI_ID HBA PORT CHANNEL NAME
	# channel 85:00.0 3 A
	# channel 85:00.0 2 B
	# channel 86:00.0 3 A
	# channel 86:00.0 2 B
	# channel af:00.0 0 C
	# channel af:00.0 1 C

	# #
	# # Example vdev_id.conf - alias
	# #
	#
	# # by-vdev
	# # name fully qualified or base name of device link
	# alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca
	# alias d2 wwn-0x5000c5002def789e

	PATH=/bin:/sbin:/usr/bin:/usr/sbin
	CONFIG=/etc/zfs/vdev_id.conf
	PHYS_PER_PORT=
	DEV=
	TOPOLOGY=
	BAY=
	ENCL_ID=""
	UNIQ_ENCL_ID=""

	usage() {
	cat << EOF
	Usage: vdev_id [-h]
	vdev_id <-d device> [-c config_file] [-p phys_per_port]
	[-g sas_direct\|sas_switch\|scsi] [-m]

	-c specify name of an alternative config file [default=$CONFIG]
	-d specify basename of device (i.e. sda)
	-e Create enclose device symlinks only (/dev/by-enclosure)
	-g Storage network topology [default="$TOPOLOGY"]
	-m Run in multipath mode
	-j Run in multijbod mode
	-p number of phy's per switch port [default=$PHYS_PER_PORT]
	-h show this summary
	EOF
	- exit 0
	+ exit 1
	+ # exit with error to avoid processing usage message by a udev rule
	}

	map_slot() {
	LINUX_SLOT=$1
	CHANNEL=$2

	MAPPED_SLOT=$(awk -v linux_slot="$LINUX_SLOT" -v channel="$CHANNEL" \
	'$1 == "slot" && $2 == linux_slot && \
	($4 ~ "^"channel"$" \|\| $4 ~ /^$/) { print $3; exit}' $CONFIG)
	if [ -z "$MAPPED_SLOT" ] ; then
	MAPPED_SLOT=$LINUX_SLOT
	fi
	printf "%d" "${MAPPED_SLOT}"
	}

	map_channel() {
	MAPPED_CHAN=
	PCI_ID=$1
	PORT=$2

	case $TOPOLOGY in
	"sas_switch")
	MAPPED_CHAN=$(awk -v port="$PORT" \
	'$1 == "channel" && $2 == port \
	{ print $3; exit }' $CONFIG)
	;;
	"sas_direct"\|"scsi")
	MAPPED_CHAN=$(awk -v pciID="$PCI_ID" -v port="$PORT" \
	'$1 == "channel" && $2 == pciID && $3 == port \
	{print $4}' $CONFIG)
	;;
	esac
	printf "%s" "${MAPPED_CHAN}"
	}

	get_encl_id() {
	set -- $(echo $1)
	count=$#

	i=1
	while [ $i -le $count ] ; do
	d=$(eval echo '$'{$i})
	id=$(cat "/sys/class/enclosure/${d}/id")
	ENCL_ID="${ENCL_ID} $id"
	i=$((i + 1))
	done
	}

	get_uniq_encl_id() {
	for uuid in ${ENCL_ID}; do
	found=0

	for count in ${UNIQ_ENCL_ID}; do
	if [ $count = $uuid ]; then
	found=1
	break
	fi
	done

	if [ $found -eq 0 ]; then
	UNIQ_ENCL_ID="${UNIQ_ENCL_ID} $uuid"
	fi
	done
	}

	# map_jbod explainer: The bsg driver knows the difference between a SAS
	# expander and fanout expander. Use hostX instance along with top-level
	# (whole enclosure) expander instances in /sys/class/enclosure and
	# matching a field in an array of expanders, using the index of the
	# matched array field as the enclosure instance, thereby making jbod IDs
	# dynamic. Avoids reliance on high overhead userspace commands like
	# multipath and lsscsi and instead uses existing sysfs data. $HOSTCHAN
	# variable derived from devpath gymnastics in sas_handler() function.
	map_jbod() {
	DEVEXP=$(ls -l "/sys/block/$DEV/device/" \| grep enclos \| awk -F/ '{print $(NF-1) }')
	DEV=$1

	# Use "set --" to create index values (Arrays)
	set -- $(ls -l /sys/class/enclosure \| grep -v "^total" \| awk '{print $9}')
	# Get count of total elements
	JBOD_COUNT=$#
	JBOD_ITEM=$*

	# Build JBODs (enclosure) id from sys/class/enclosure/<dev>/id
	get_encl_id "$JBOD_ITEM"
	# Different expander instances for each paths.
	# Filter out and keep only unique id.
	get_uniq_encl_id

	# Identify final 'mapped jbod'
	j=0
	for count in ${UNIQ_ENCL_ID}; do
	i=1
	j=$((j + 1))
	while [ $i -le $JBOD_COUNT ] ; do
	d=$(eval echo '$'{$i})
	id=$(cat "/sys/class/enclosure/${d}/id")
	if [ "$d" = "$DEVEXP" ] && [ $id = $count ] ; then
	MAPPED_JBOD=$j
	break
	fi
	i=$((i + 1))
	done
	done

	printf "%d" "${MAPPED_JBOD}"
	}

	sas_handler() {
	if [ -z "$PHYS_PER_PORT" ] ; then
	PHYS_PER_PORT=$(awk '$1 == "phys_per_port" \
	{print $2; exit}' $CONFIG)
	fi
	PHYS_PER_PORT=${PHYS_PER_PORT:-4}

	if ! echo "$PHYS_PER_PORT" \| grep -q -E '^[0-9]+$' ; then
	echo "Error: phys_per_port value $PHYS_PER_PORT is non-numeric"
	exit 1
	fi

	if [ -z "$MULTIPATH_MODE" ] ; then
	MULTIPATH_MODE=$(awk '$1 == "multipath" \
	{print $2; exit}' $CONFIG)
	fi

	if [ -z "$MULTIJBOD_MODE" ] ; then
	MULTIJBOD_MODE=$(awk '$1 == "multijbod" \
	{print $2; exit}' $CONFIG)
	fi

	# Use first running component device if we're handling a dm-mpath device
	if [ "$MULTIPATH_MODE" = "yes" ] ; then
	# If udev didn't tell us the UUID via DM_NAME, check /dev/mapper
	if [ -z "$DM_NAME" ] ; then
	DM_NAME=$(ls -l --full-time /dev/mapper \|
	grep "$DEV"$ \| awk '{print $9}')
	fi

	# For raw disks udev exports DEVTYPE=partition when
	# handling partitions, and the rules can be written to
	# take advantage of this to append a -part suffix. For
	# dm devices we get DEVTYPE=disk even for partitions so
	# we have to append the -part suffix directly in the
	# helper.
	if [ "$DEVTYPE" != "partition" ] ; then
	# Match p[number], remove the 'p' and prepend "-part"
	PART=$(echo "$DM_NAME" \|
	awk 'match($0,/p[0-9]+$/) {print "-part"substr($0,RSTART+1,RLENGTH-1)}')
	fi

	# Strip off partition information.
	DM_NAME=$(echo "$DM_NAME" \| sed 's/p[0-9][0-9]*$//')
	if [ -z "$DM_NAME" ] ; then
	return
	fi

	# Utilize DM device name to gather subordinate block devices
	# using sysfs to avoid userspace utilities

	# If our DEVNAME is something like /dev/dm-177, then we may be
	# able to get our DMDEV from it.
	DMDEV=$(echo $DEVNAME \| sed 's;/dev/;;g')
	if [ ! -e /sys/block/$DMDEV/slaves/* ] ; then
	# It's not there, try looking in /dev/mapper
	DMDEV=$(ls -l --full-time /dev/mapper \| grep $DM_NAME \|
	awk '{gsub("../", " "); print $NF}')
	fi

	# Use sysfs pointers in /sys/block/dm-X/slaves because using
	# userspace tools creates lots of overhead and should be avoided
	# whenever possible. Use awk to isolate lowest instance of
	# sd device member in dm device group regardless of string
	# length.
	DEV=$(ls "/sys/block/$DMDEV/slaves" \| awk '
	{ len=sprintf ("%20s",length($0)); gsub(/ /,0,str); a[NR]=len "_" $0; }
	END {
	asort(a)
	print substr(a[1],22)
	}')

	if [ -z "$DEV" ] ; then
	return
	fi
	fi

	if echo "$DEV" \| grep -q ^/devices/ ; then
	sys_path=$DEV
	else
	sys_path=$(udevadm info -q path -p "/sys/block/$DEV" 2>/dev/null)
	fi

	# Use positional parameters as an ad-hoc array
	set -- $(echo "$sys_path" \| tr / ' ')
	num_dirs=$#
	scsi_host_dir="/sys"

	# Get path up to /sys/.../hostX
	i=1

	while [ $i -le "$num_dirs" ] ; do
	d=$(eval echo '$'{$i})
	scsi_host_dir="$scsi_host_dir/$d"
	echo "$d" \| grep -q -E '^host[0-9]+$' && break
	i=$((i + 1))
	done

	# Lets grab the SAS host channel number and save it for JBOD sorting later
	HOSTCHAN=$(echo "$d" \| awk -F/ '{ gsub("host","",$NF); print $NF}')

	if [ $i = "$num_dirs" ] ; then
	return
	fi

	PCI_ID=$(eval echo '$'{$((i -1))} \| awk -F: '{print $2":"$3}')

	# In sas_switch mode, the directory four levels beneath
	# /sys/.../hostX contains symlinks to phy devices that reveal
	# the switch port number. In sas_direct mode, the phy links one
	# directory down reveal the HBA port.
	port_dir=$scsi_host_dir

	case $TOPOLOGY in
	"sas_switch") j=$((i + 4)) ;;
	"sas_direct") j=$((i + 1)) ;;
	esac

	i=$((i + 1))

	while [ $i -le $j ] ; do
	port_dir="$port_dir/$(eval echo '$'{$i})"
	i=$((i + 1))
	done

	PHY=$(ls -d "$port_dir"/phy* 2>/dev/null \| head -1 \| awk -F: '{print $NF}')
	if [ -z "$PHY" ] ; then
	PHY=0
	fi
	PORT=$((PHY / PHYS_PER_PORT))

	# Look in /sys/.../sas_device/end_device-X for the bay_identifier
	# attribute.
	end_device_dir=$port_dir

	while [ $i -lt "$num_dirs" ] ; do
	d=$(eval echo '$'{$i})
	end_device_dir="$end_device_dir/$d"
	if echo "$d" \| grep -q '^end_device' ; then
	end_device_dir="$end_device_dir/sas_device/$d"
	break
	fi
	i=$((i + 1))
	done

	# Add 'mix' slot type for environments where dm-multipath devices
	# include end-devices connected via SAS expanders or direct connection
	# to SAS HBA. A mixed connectivity environment such as pool devices
	# contained in a SAS JBOD and spare drives or log devices directly
	# connected in a server backplane without expanders in the I/O path.
	SLOT=

	case $BAY in
	"bay")
	SLOT=$(cat "$end_device_dir/bay_identifier" 2>/dev/null)
	;;
	"mix")
	if [ $(cat "$end_device_dir/bay_identifier" 2>/dev/null) ] ; then
	SLOT=$(cat "$end_device_dir/bay_identifier" 2>/dev/null)
	else
	SLOT=$(cat "$end_device_dir/phy_identifier" 2>/dev/null)
	fi
	;;
	"phy")
	SLOT=$(cat "$end_device_dir/phy_identifier" 2>/dev/null)
	;;
	"port")
	d=$(eval echo '$'{$i})
	SLOT=$(echo "$d" \| sed -e 's/^.*://')
	;;
	"id")
	i=$((i + 1))
	d=$(eval echo '$'{$i})
	SLOT=$(echo "$d" \| sed -e 's/^.*://')
	;;
	"lun")
	i=$((i + 2))
	d=$(eval echo '$'{$i})
	SLOT=$(echo "$d" \| sed -e 's/^.*://')
	;;
	"ses")
	# look for this SAS path in all SCSI Enclosure Services
	# (SES) enclosures
	sas_address=$(cat "$end_device_dir/sas_address" 2>/dev/null)
	enclosures=$(lsscsi -g \| \
	sed -n -e '/enclosu/s/^.* $[^ ][^ ]$ $/\1/p')
	for enclosure in $enclosures; do
	set -- $(sg_ses -p aes "$enclosure" \| \
	awk "/device slot number:/{slot=\$12} \
	/SAS address: $sas_address/\
	{print slot}")
	SLOT=$1
	if [ -n "$SLOT" ] ; then
	break
	fi
	done
	;;
	esac
	if [ -z "$SLOT" ] ; then
	return
	fi

	if [ "$MULTIJBOD_MODE" = "yes" ] ; then
	CHAN=$(map_channel "$PCI_ID" "$PORT")
	SLOT=$(map_slot "$SLOT" "$CHAN")
	JBOD=$(map_jbod "$DEV")

	if [ -z "$CHAN" ] ; then
	return
	fi
	echo "${CHAN}"-"${JBOD}"-"${SLOT}${PART}"
	else
	CHAN=$(map_channel "$PCI_ID" "$PORT")
	SLOT=$(map_slot "$SLOT" "$CHAN")

	if [ -z "$CHAN" ] ; then
	return
	fi
	echo "${CHAN}${SLOT}${PART}"
	fi
	}

	scsi_handler() {
	if [ -z "$FIRST_BAY_NUMBER" ] ; then
	FIRST_BAY_NUMBER=$(awk '$1 == "first_bay_number" \
	{print $2; exit}' $CONFIG)
	fi
	FIRST_BAY_NUMBER=${FIRST_BAY_NUMBER:-0}

	if [ -z "$PHYS_PER_PORT" ] ; then
	PHYS_PER_PORT=$(awk '$1 == "phys_per_port" \
	{print $2; exit}' $CONFIG)
	fi
	PHYS_PER_PORT=${PHYS_PER_PORT:-4}

	if ! echo "$PHYS_PER_PORT" \| grep -q -E '^[0-9]+$' ; then
	echo "Error: phys_per_port value $PHYS_PER_PORT is non-numeric"
	exit 1
	fi

	if [ -z "$MULTIPATH_MODE" ] ; then
	MULTIPATH_MODE=$(awk '$1 == "multipath" \
	{print $2; exit}' $CONFIG)
	fi

	# Use first running component device if we're handling a dm-mpath device
	if [ "$MULTIPATH_MODE" = "yes" ] ; then
	# If udev didn't tell us the UUID via DM_NAME, check /dev/mapper
	if [ -z "$DM_NAME" ] ; then
	DM_NAME=$(ls -l --full-time /dev/mapper \|
	grep "$DEV"$ \| awk '{print $9}')
	fi

	# For raw disks udev exports DEVTYPE=partition when
	# handling partitions, and the rules can be written to
	# take advantage of this to append a -part suffix. For
	# dm devices we get DEVTYPE=disk even for partitions so
	# we have to append the -part suffix directly in the
	# helper.
	if [ "$DEVTYPE" != "partition" ] ; then
	# Match p[number], remove the 'p' and prepend "-part"
	PART=$(echo "$DM_NAME" \|
	awk 'match($0,/p[0-9]+$/) {print "-part"substr($0,RSTART+1,RLENGTH-1)}')
	fi

	# Strip off partition information.
	DM_NAME=$(echo "$DM_NAME" \| sed 's/p[0-9][0-9]*$//')
	if [ -z "$DM_NAME" ] ; then
	return
	fi

	# Get the raw scsi device name from multipath -ll. Strip off
	# leading pipe symbols to make field numbering consistent.
	DEV=$(multipath -ll "$DM_NAME" \|
	awk '/running/{gsub("^[\|]"," "); print $3 ; exit}')
	if [ -z "$DEV" ] ; then
	return
	fi
	fi

	if echo "$DEV" \| grep -q ^/devices/ ; then
	sys_path=$DEV
	else
	sys_path=$(udevadm info -q path -p "/sys/block/$DEV" 2>/dev/null)
	fi

	# expect sys_path like this, for example:
	# /devices/pci0000:00/0000:00:0b.0/0000:09:00.0/0000:0a:05.0/0000:0c:00.0/host3/target3:1:0/3:1:0:21/block/sdv

	# Use positional parameters as an ad-hoc array
	set -- $(echo "$sys_path" \| tr / ' ')
	num_dirs=$#
	scsi_host_dir="/sys"

	# Get path up to /sys/.../hostX
	i=1

	while [ $i -le "$num_dirs" ] ; do
	d=$(eval echo '$'{$i})
	scsi_host_dir="$scsi_host_dir/$d"

	echo "$d" \| grep -q -E '^host[0-9]+$' && break
	i=$((i + 1))
	done

	if [ $i = "$num_dirs" ] ; then
	return
	fi

	PCI_ID=$(eval echo '$'{$((i -1))} \| awk -F: '{print $2":"$3}')

	# In scsi mode, the directory two levels beneath
	# /sys/.../hostX reveals the port and slot.
	port_dir=$scsi_host_dir
	j=$((i + 2))

	i=$((i + 1))
	while [ $i -le $j ] ; do
	port_dir="$port_dir/$(eval echo '$'{$i})"
	i=$((i + 1))
	done

	set -- $(echo "$port_dir" \| sed -e 's/^.:$[^:]$:$[^:]*$$/\1 \2/')
	PORT=$1
	SLOT=$(($2 + FIRST_BAY_NUMBER))

	if [ -z "$SLOT" ] ; then
	return
	fi

	CHAN=$(map_channel "$PCI_ID" "$PORT")
	SLOT=$(map_slot "$SLOT" "$CHAN")

	if [ -z "$CHAN" ] ; then
	return
	fi
	echo "${CHAN}${SLOT}${PART}"
	}

	# Figure out the name for the enclosure symlink
	enclosure_handler () {
	# We get all the info we need from udev's DEVPATH variable:
	#
	# DEVPATH=/sys/devices/pci0000:00/0000:00:03.0/0000:05:00.0/host0/subsystem/devices/0:0:0:0/scsi_generic/sg0

	# Get the enclosure ID ("0:0:0:0")
	ENC=$(basename $(readlink -m "/sys/$DEVPATH/../.."))
	if [ ! -d "/sys/class/enclosure/$ENC" ] ; then
	# Not an enclosure, bail out
	return
	fi

	# Get the long sysfs device path to our enclosure. Looks like:
	# /devices/pci0000:00/0000:00:03.0/0000:05:00.0/host0/port-0:0/ ... /enclosure/0:0:0:0

	ENC_DEVICE=$(readlink "/sys/class/enclosure/$ENC")

	# Grab the full path to the hosts port dir:
	# /devices/pci0000:00/0000:00:03.0/0000:05:00.0/host0/port-0:0
	PORT_DIR=$(echo "$ENC_DEVICE" \| grep -Eo '.+host[0-9]+/port-[0-9]+:[0-9]+')

	# Get the port number
	PORT_ID=$(echo "$PORT_DIR" \| grep -Eo "[0-9]+$")

	# The PCI directory is two directories up from the port directory
	# /sys/devices/pci0000:00/0000:00:03.0/0000:05:00.0
	PCI_ID_LONG=$(basename $(readlink -m "/sys/$PORT_DIR/../.."))

	# Strip down the PCI address from 0000:05:00.0 to 05:00.0
	PCI_ID=$(echo "$PCI_ID_LONG" \| sed -r 's/^[0-9]+://g')

	# Name our device according to vdev_id.conf (like "L0" or "U1").
	NAME=$(awk '/channel/{if ($1 == "channel" && $2 == "$PCI_ID" && \
	$3 == "$PORT_ID") {print ${4}int(count[$4])}; count[$4]++}' $CONFIG)

	echo "${NAME}"
	}

	alias_handler () {
	# Special handling is needed to correctly append a -part suffix
	# to partitions of device mapper devices. The DEVTYPE attribute
	# is normally set to "disk" instead of "partition" in this case,
	# so the udev rules won't handle that for us as they do for
	# "plain" block devices.
	#
	# For example, we may have the following links for a device and its
	# partitions,
	#
	# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0 -> ../../dm-0
	# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0p1 -> ../../dm-1
	# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0p2 -> ../../dm-3
	#
	# and the following alias in vdev_id.conf.
	#
	# alias A0 dm-name-isw_dibgbfcije_ARRAY0
	#
	# The desired outcome is for the following links to be created
	# without having explicitly defined aliases for the partitions.
	#
	# /dev/disk/by-vdev/A0 -> ../../dm-0
	# /dev/disk/by-vdev/A0-part1 -> ../../dm-1
	# /dev/disk/by-vdev/A0-part2 -> ../../dm-3
	#
	# Warning: The following grep pattern will misidentify whole-disk
	# devices whose names end with 'p' followed by a string of
	# digits as partitions, causing alias creation to fail. This
	# ambiguity seems unavoidable, so devices using this facility
	# must not use such names.
	DM_PART=
	if echo "$DM_NAME" \| grep -q -E 'p[0-9][0-9]*$' ; then
	if [ "$DEVTYPE" != "partition" ] ; then
	# Match p[number], remove the 'p' and prepend "-part"
	DM_PART=$(echo "$DM_NAME" \|
	awk 'match($0,/p[0-9]+$/) {print "-part"substr($0,RSTART+1,RLENGTH-1)}')
	fi
	fi

	# DEVLINKS attribute must have been populated by already-run udev rules.
	for link in $DEVLINKS ; do
	# Remove partition information to match key of top-level device.
	if [ -n "$DM_PART" ] ; then
	link=$(echo "$link" \| sed 's/p[0-9][0-9]*$//')
	fi
	# Check both the fully qualified and the base name of link.
	for l in $link $(basename "$link") ; do
	if [ ! -z "$l" ]; then
	alias=$(awk -v var="$l" '($1 == "alias") && \
	($3 == var) \
	{ print $2; exit }' $CONFIG)
	if [ -n "$alias" ] ; then
	echo "${alias}${DM_PART}"
	return
	fi
	fi
	done
	done
	}

	# main
	while getopts 'c:d:eg:jmp:h' OPTION; do
	case ${OPTION} in
	c)
	CONFIG=${OPTARG}
	;;
	d)
	DEV=${OPTARG}
	;;
	e)
	# When udev sees a scsi_generic device, it calls this script with -e to
	# create the enclosure device symlinks only. We also need
	# "enclosure_symlinks yes" set in vdev_id.config to actually create the
	# symlink.
	ENCLOSURE_MODE=$(awk '{if ($1 == "enclosure_symlinks") \
	print $2}' "$CONFIG")

	if [ "$ENCLOSURE_MODE" != "yes" ] ; then
	exit 0
	fi
	;;
	g)
	TOPOLOGY=$OPTARG
	;;
	p)
	PHYS_PER_PORT=${OPTARG}
	;;
	j)
	MULTIJBOD_MODE=yes
	;;
	m)
	MULTIPATH_MODE=yes
	;;
	h)
	usage
	;;
	esac
	done

	if [ ! -r "$CONFIG" ] ; then
	echo "Error: Config file \"$CONFIG\" not found"
	- exit 0
	+ exit 1
	fi

	if [ -z "$DEV" ] && [ -z "$ENCLOSURE_MODE" ] ; then
	echo "Error: missing required option -d"
	exit 1
	fi

	if [ -z "$TOPOLOGY" ] ; then
	TOPOLOGY=$(awk '($1 == "topology") {print $2; exit}' "$CONFIG")
	fi

	if [ -z "$BAY" ] ; then
	BAY=$(awk '($1 == "slot") {print $2; exit}' "$CONFIG")
	fi

	TOPOLOGY=${TOPOLOGY:-sas_direct}

	# Should we create /dev/by-enclosure symlinks?
	if [ "$ENCLOSURE_MODE" = "yes" ] && [ "$TOPOLOGY" = "sas_direct" ] ; then
	ID_ENCLOSURE=$(enclosure_handler)
	if [ -z "$ID_ENCLOSURE" ] ; then
	exit 0
	fi

	# Just create the symlinks to the enclosure devices and then exit.
	ENCLOSURE_PREFIX=$(awk '/enclosure_symlinks_prefix/{print $2}' "$CONFIG")
	if [ -z "$ENCLOSURE_PREFIX" ] ; then
	ENCLOSURE_PREFIX="enc"
	fi
	echo "ID_ENCLOSURE=$ID_ENCLOSURE"
	echo "ID_ENCLOSURE_PATH=by-enclosure/$ENCLOSURE_PREFIX-$ID_ENCLOSURE"
	exit 0
	fi

	# First check if an alias was defined for this device.
	ID_VDEV=$(alias_handler)

	if [ -z "$ID_VDEV" ] ; then
	BAY=${BAY:-bay}
	case $TOPOLOGY in
	sas_direct\|sas_switch)
	ID_VDEV=$(sas_handler)
	;;
	scsi)
	ID_VDEV=$(scsi_handler)
	;;
	*)
	echo "Error: unknown topology $TOPOLOGY"
	exit 1
	;;
	esac
	fi

	if [ -n "$ID_VDEV" ] ; then
	echo "ID_VDEV=${ID_VDEV}"
	echo "ID_VDEV_PATH=disk/by-vdev/${ID_VDEV}"
	fi
	diff --git a/sys/contrib/openzfs/cmd/zdb/zdb.c b/sys/contrib/openzfs/cmd/zdb/zdb.c
	index c548936bcce5..e964e3ba8acf 100644
	--- a/sys/contrib/openzfs/cmd/zdb/zdb.c
	+++ b/sys/contrib/openzfs/cmd/zdb/zdb.c
	@@ -1,8771 +1,8773 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	* Copyright 2016 Nexenta Systems, Inc.
	* Copyright (c) 2017, 2018 Lawrence Livermore National Security, LLC.
	* Copyright (c) 2015, 2017, Intel Corporation.
	* Copyright (c) 2020 Datto Inc.
	* Copyright (c) 2020, The FreeBSD Foundation [1]
	*
	* [1] Portions of this software were developed by Allan Jude
	* under sponsorship from the FreeBSD Foundation.
	* Copyright (c) 2021 Allan Jude
	*/

	#include <stdio.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <ctype.h>
	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/dmu.h>
	#include <sys/zap.h>
	#include <sys/fs/zfs.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_sa.h>
	#include <sys/sa.h>
	#include <sys/sa_impl.h>
	#include <sys/vdev.h>
	#include <sys/vdev_impl.h>
	#include <sys/metaslab_impl.h>
	#include <sys/dmu_objset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_bookmark.h>
	#include <sys/dbuf.h>
	#include <sys/zil.h>
	#include <sys/zil_impl.h>
	#include <sys/stat.h>
	#include <sys/resource.h>
	#include <sys/dmu_send.h>
	#include <sys/dmu_traverse.h>
	#include <sys/zio_checksum.h>
	#include <sys/zio_compress.h>
	#include <sys/zfs_fuid.h>
	#include <sys/arc.h>
	#include <sys/arc_impl.h>
	#include <sys/ddt.h>
	#include <sys/zfeature.h>
	#include <sys/abd.h>
	#include <sys/blkptr.h>
	#include <sys/dsl_crypt.h>
	#include <sys/dsl_scan.h>
	#include <sys/btree.h>
	#include <zfs_comutil.h>
	#include <sys/zstd/zstd.h>

	#include <libnvpair.h>
	#include <libzutil.h>

	#include "zdb.h"

	#define ZDB_COMPRESS_NAME(idx) ((idx) < ZIO_COMPRESS_FUNCTIONS ? \
	zio_compress_table[(idx)].ci_name : "UNKNOWN")
	#define ZDB_CHECKSUM_NAME(idx) ((idx) < ZIO_CHECKSUM_FUNCTIONS ? \
	zio_checksum_table[(idx)].ci_name : "UNKNOWN")
	#define ZDB_OT_TYPE(idx) ((idx) < DMU_OT_NUMTYPES ? (idx) : \
	(idx) == DMU_OTN_ZAP_DATA \|\| (idx) == DMU_OTN_ZAP_METADATA ? \
	DMU_OT_ZAP_OTHER : \
	(idx) == DMU_OTN_UINT64_DATA \|\| (idx) == DMU_OTN_UINT64_METADATA ? \
	DMU_OT_UINT64_OTHER : DMU_OT_NUMTYPES)

	static char *
	zdb_ot_name(dmu_object_type_t type)
	{
	if (type < DMU_OT_NUMTYPES)
	return (dmu_ot[type].ot_name);
	else if ((type & DMU_OT_NEWTYPE) &&
	((type & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS))
	return (dmu_ot_byteswap[type & DMU_OT_BYTESWAP_MASK].ob_name);
	else
	return ("UNKNOWN");
	}

	extern int reference_tracking_enable;
	extern int zfs_recover;
	extern unsigned long zfs_arc_meta_min, zfs_arc_meta_limit;
	extern int zfs_vdev_async_read_max_active;
	extern boolean_t spa_load_verify_dryrun;
	extern int zfs_reconstruct_indirect_combinations_max;
	extern int zfs_btree_verify_intensity;

	static const char cmdname[] = "zdb";
	uint8_t dump_opt[256];

	typedef void object_viewer_t(objset_t , uint64_t, void data, size_t size);

	uint64_t *zopt_metaslab = NULL;
	static unsigned zopt_metaslab_args = 0;

	typedef struct zopt_object_range {
	uint64_t zor_obj_start;
	uint64_t zor_obj_end;
	uint64_t zor_flags;
	} zopt_object_range_t;
	zopt_object_range_t *zopt_object_ranges = NULL;
	static unsigned zopt_object_args = 0;

	static int flagbits[256];

	#define ZOR_FLAG_PLAIN_FILE 0x0001
	#define ZOR_FLAG_DIRECTORY 0x0002
	#define ZOR_FLAG_SPACE_MAP 0x0004
	#define ZOR_FLAG_ZAP 0x0008
	#define ZOR_FLAG_ALL_TYPES -1
	#define ZOR_SUPPORTED_FLAGS (ZOR_FLAG_PLAIN_FILE \| \
	ZOR_FLAG_DIRECTORY \| \
	ZOR_FLAG_SPACE_MAP \| \
	ZOR_FLAG_ZAP)

	#define ZDB_FLAG_CHECKSUM 0x0001
	#define ZDB_FLAG_DECOMPRESS 0x0002
	#define ZDB_FLAG_BSWAP 0x0004
	#define ZDB_FLAG_GBH 0x0008
	#define ZDB_FLAG_INDIRECT 0x0010
	#define ZDB_FLAG_RAW 0x0020
	#define ZDB_FLAG_PRINT_BLKPTR 0x0040
	#define ZDB_FLAG_VERBOSE 0x0080

	uint64_t max_inflight_bytes = 256 * 1024 * 1024; /* 256MB */
	static int leaked_objects = 0;
	static range_tree_t *mos_refd_objs;

	static void snprintf_blkptr_compact(char , size_t, const blkptr_t ,
	boolean_t);
	static void mos_obj_refd(uint64_t);
	static void mos_obj_refd_multiple(uint64_t);
	static int dump_bpobj_cb(void arg, const blkptr_t bp, boolean_t free,
	dmu_tx_t *tx);

	typedef struct sublivelist_verify {
	/* FREE's that haven't yet matched to an ALLOC, in one sub-livelist */
	zfs_btree_t sv_pair;

	/* ALLOC's without a matching FREE, accumulates across sub-livelists */
	zfs_btree_t sv_leftover;
	} sublivelist_verify_t;

	static int
	livelist_compare(const void larg, const void rarg)
	{
	const blkptr_t *l = larg;
	const blkptr_t *r = rarg;

	/* Sort them according to dva[0] */
	uint64_t l_dva0_vdev, r_dva0_vdev;
	l_dva0_vdev = DVA_GET_VDEV(&l->blk_dva[0]);
	r_dva0_vdev = DVA_GET_VDEV(&r->blk_dva[0]);
	if (l_dva0_vdev < r_dva0_vdev)
	return (-1);
	else if (l_dva0_vdev > r_dva0_vdev)
	return (+1);

	/* if vdevs are equal, sort by offsets. */
	uint64_t l_dva0_offset;
	uint64_t r_dva0_offset;
	l_dva0_offset = DVA_GET_OFFSET(&l->blk_dva[0]);
	r_dva0_offset = DVA_GET_OFFSET(&r->blk_dva[0]);
	if (l_dva0_offset < r_dva0_offset) {
	return (-1);
	} else if (l_dva0_offset > r_dva0_offset) {
	return (+1);
	}

	/*
	* Since we're storing blkptrs without cancelling FREE/ALLOC pairs,
	* it's possible the offsets are equal. In that case, sort by txg
	*/
	if (l->blk_birth < r->blk_birth) {
	return (-1);
	} else if (l->blk_birth > r->blk_birth) {
	return (+1);
	}
	return (0);
	}

	typedef struct sublivelist_verify_block {
	dva_t svb_dva;

	/*
	* We need this to check if the block marked as allocated
	* in the livelist was freed (and potentially reallocated)
	* in the metaslab spacemaps at a later TXG.
	*/
	uint64_t svb_allocated_txg;
	} sublivelist_verify_block_t;

	static void zdb_print_blkptr(const blkptr_t *bp, int flags);

	typedef struct sublivelist_verify_block_refcnt {
	/* block pointer entry in livelist being verified */
	blkptr_t svbr_blk;

	/*
	* Refcount gets incremented to 1 when we encounter the first
	* FREE entry for the svfbr block pointer and a node for it
	* is created in our ZDB verification/tracking metadata.
	*
	* As we encounter more FREE entries we increment this counter
	* and similarly decrement it whenever we find the respective
	* ALLOC entries for this block.
	*
	* When the refcount gets to 0 it means that all the FREE and
	* ALLOC entries of this block have paired up and we no longer
	* need to track it in our verification logic (e.g. the node
	* containing this struct in our verification data structure
	* should be freed).
	*
	* [refer to sublivelist_verify_blkptr() for the actual code]
	*/
	uint32_t svbr_refcnt;
	} sublivelist_verify_block_refcnt_t;

	static int
	sublivelist_block_refcnt_compare(const void larg, const void rarg)
	{
	const sublivelist_verify_block_refcnt_t *l = larg;
	const sublivelist_verify_block_refcnt_t *r = rarg;
	return (livelist_compare(&l->svbr_blk, &r->svbr_blk));
	}

	static int
	sublivelist_verify_blkptr(void arg, const blkptr_t bp, boolean_t free,
	dmu_tx_t *tx)
	{
	ASSERT3P(tx, ==, NULL);
	struct sublivelist_verify *sv = arg;
	sublivelist_verify_block_refcnt_t current = {
	.svbr_blk = *bp,

	/*
	* Start with 1 in case this is the first free entry.
	* This field is not used for our B-Tree comparisons
	* anyway.
	*/
	.svbr_refcnt = 1,
	};

	zfs_btree_index_t where;
	sublivelist_verify_block_refcnt_t *pair =
	zfs_btree_find(&sv->sv_pair, &current, &where);
	if (free) {
	if (pair == NULL) {
	/* first free entry for this block pointer */
	zfs_btree_add(&sv->sv_pair, &current);
	} else {
	pair->svbr_refcnt++;
	}
	} else {
	if (pair == NULL) {
	/* block that is currently marked as allocated */
	for (int i = 0; i < SPA_DVAS_PER_BP; i++) {
	if (DVA_IS_EMPTY(&bp->blk_dva[i]))
	break;
	sublivelist_verify_block_t svb = {
	.svb_dva = bp->blk_dva[i],
	.svb_allocated_txg = bp->blk_birth
	};

	if (zfs_btree_find(&sv->sv_leftover, &svb,
	&where) == NULL) {
	zfs_btree_add_idx(&sv->sv_leftover,
	&svb, &where);
	}
	}
	} else {
	/* alloc matches a free entry */
	pair->svbr_refcnt--;
	if (pair->svbr_refcnt == 0) {
	/* all allocs and frees have been matched */
	zfs_btree_remove_idx(&sv->sv_pair, &where);
	}
	}
	}

	return (0);
	}

	static int
	sublivelist_verify_func(void args, dsl_deadlist_entry_t dle)
	{
	int err;
	struct sublivelist_verify *sv = args;

	zfs_btree_create(&sv->sv_pair, sublivelist_block_refcnt_compare,
	sizeof (sublivelist_verify_block_refcnt_t));

	err = bpobj_iterate_nofree(&dle->dle_bpobj, sublivelist_verify_blkptr,
	sv, NULL);

	sublivelist_verify_block_refcnt_t *e;
	zfs_btree_index_t *cookie = NULL;
	while ((e = zfs_btree_destroy_nodes(&sv->sv_pair, &cookie)) != NULL) {
	char blkbuf[BP_SPRINTF_LEN];
	snprintf_blkptr_compact(blkbuf, sizeof (blkbuf),
	&e->svbr_blk, B_TRUE);
	(void) printf("\tERROR: %d unmatched FREE(s): %s\n",
	e->svbr_refcnt, blkbuf);
	}
	zfs_btree_destroy(&sv->sv_pair);

	return (err);
	}

	static int
	livelist_block_compare(const void larg, const void rarg)
	{
	const sublivelist_verify_block_t *l = larg;
	const sublivelist_verify_block_t *r = rarg;

	if (DVA_GET_VDEV(&l->svb_dva) < DVA_GET_VDEV(&r->svb_dva))
	return (-1);
	else if (DVA_GET_VDEV(&l->svb_dva) > DVA_GET_VDEV(&r->svb_dva))
	return (+1);

	if (DVA_GET_OFFSET(&l->svb_dva) < DVA_GET_OFFSET(&r->svb_dva))
	return (-1);
	else if (DVA_GET_OFFSET(&l->svb_dva) > DVA_GET_OFFSET(&r->svb_dva))
	return (+1);

	if (DVA_GET_ASIZE(&l->svb_dva) < DVA_GET_ASIZE(&r->svb_dva))
	return (-1);
	else if (DVA_GET_ASIZE(&l->svb_dva) > DVA_GET_ASIZE(&r->svb_dva))
	return (+1);

	return (0);
	}

	/*
	* Check for errors in a livelist while tracking all unfreed ALLOCs in the
	* sublivelist_verify_t: sv->sv_leftover
	*/
	static void
	livelist_verify(dsl_deadlist_t dl, void arg)
	{
	sublivelist_verify_t *sv = arg;
	dsl_deadlist_iterate(dl, sublivelist_verify_func, sv);
	}

	/*
	* Check for errors in the livelist entry and discard the intermediary
	* data structures
	*/
	/* ARGSUSED */
	static int
	sublivelist_verify_lightweight(void args, dsl_deadlist_entry_t dle)
	{
	sublivelist_verify_t sv;
	zfs_btree_create(&sv.sv_leftover, livelist_block_compare,
	sizeof (sublivelist_verify_block_t));
	int err = sublivelist_verify_func(&sv, dle);
	zfs_btree_clear(&sv.sv_leftover);
	zfs_btree_destroy(&sv.sv_leftover);
	return (err);
	}

	typedef struct metaslab_verify {
	/*
	* Tree containing all the leftover ALLOCs from the livelists
	* that are part of this metaslab.
	*/
	zfs_btree_t mv_livelist_allocs;

	/*
	* Metaslab information.
	*/
	uint64_t mv_vdid;
	uint64_t mv_msid;
	uint64_t mv_start;
	uint64_t mv_end;

	/*
	* What's currently allocated for this metaslab.
	*/
	range_tree_t *mv_allocated;
	} metaslab_verify_t;

	typedef void ll_iter_t(dsl_deadlist_t ll, void arg);

	typedef int (zdb_log_sm_cb_t)(spa_t spa, space_map_entry_t *sme, uint64_t txg,
	void *arg);

	typedef struct unflushed_iter_cb_arg {
	spa_t *uic_spa;
	uint64_t uic_txg;
	void *uic_arg;
	zdb_log_sm_cb_t uic_cb;
	} unflushed_iter_cb_arg_t;

	static int
	iterate_through_spacemap_logs_cb(space_map_entry_t sme, void arg)
	{
	unflushed_iter_cb_arg_t *uic = arg;
	return (uic->uic_cb(uic->uic_spa, sme, uic->uic_txg, uic->uic_arg));
	}

	static void
	iterate_through_spacemap_logs(spa_t spa, zdb_log_sm_cb_t cb, void arg)
	{
	if (!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))
	return;

	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	for (spa_log_sm_t *sls = avl_first(&spa->spa_sm_logs_by_txg);
	sls; sls = AVL_NEXT(&spa->spa_sm_logs_by_txg, sls)) {
	space_map_t *sm = NULL;
	VERIFY0(space_map_open(&sm, spa_meta_objset(spa),
	sls->sls_sm_obj, 0, UINT64_MAX, SPA_MINBLOCKSHIFT));

	unflushed_iter_cb_arg_t uic = {
	.uic_spa = spa,
	.uic_txg = sls->sls_txg,
	.uic_arg = arg,
	.uic_cb = cb
	};
	VERIFY0(space_map_iterate(sm, space_map_length(sm),
	iterate_through_spacemap_logs_cb, &uic));
	space_map_close(sm);
	}
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	}

	static void
	verify_livelist_allocs(metaslab_verify_t *mv, uint64_t txg,
	uint64_t offset, uint64_t size)
	{
	sublivelist_verify_block_t svb;
	DVA_SET_VDEV(&svb.svb_dva, mv->mv_vdid);
	DVA_SET_OFFSET(&svb.svb_dva, offset);
	DVA_SET_ASIZE(&svb.svb_dva, size);
	zfs_btree_index_t where;
	uint64_t end_offset = offset + size;

	/*
	* Look for an exact match for spacemap entry in the livelist entries.
	* Then, look for other livelist entries that fall within the range
	* of the spacemap entry as it may have been condensed
	*/
	sublivelist_verify_block_t *found =
	zfs_btree_find(&mv->mv_livelist_allocs, &svb, &where);
	if (found == NULL) {
	found = zfs_btree_next(&mv->mv_livelist_allocs, &where, &where);
	}
	for (; found != NULL && DVA_GET_VDEV(&found->svb_dva) == mv->mv_vdid &&
	DVA_GET_OFFSET(&found->svb_dva) < end_offset;
	found = zfs_btree_next(&mv->mv_livelist_allocs, &where, &where)) {
	if (found->svb_allocated_txg <= txg) {
	(void) printf("ERROR: Livelist ALLOC [%llx:%llx] "
	"from TXG %llx FREED at TXG %llx\n",
	(u_longlong_t)DVA_GET_OFFSET(&found->svb_dva),
	(u_longlong_t)DVA_GET_ASIZE(&found->svb_dva),
	(u_longlong_t)found->svb_allocated_txg,
	(u_longlong_t)txg);
	}
	}
	}

	static int
	metaslab_spacemap_validation_cb(space_map_entry_t sme, void arg)
	{
	metaslab_verify_t *mv = arg;
	uint64_t offset = sme->sme_offset;
	uint64_t size = sme->sme_run;
	uint64_t txg = sme->sme_txg;

	if (sme->sme_type == SM_ALLOC) {
	if (range_tree_contains(mv->mv_allocated,
	offset, size)) {
	(void) printf("ERROR: DOUBLE ALLOC: "
	"%llu [%llx:%llx] "
	"%llu:%llu LOG_SM\n",
	(u_longlong_t)txg, (u_longlong_t)offset,
	(u_longlong_t)size, (u_longlong_t)mv->mv_vdid,
	(u_longlong_t)mv->mv_msid);
	} else {
	range_tree_add(mv->mv_allocated,
	offset, size);
	}
	} else {
	if (!range_tree_contains(mv->mv_allocated,
	offset, size)) {
	(void) printf("ERROR: DOUBLE FREE: "
	"%llu [%llx:%llx] "
	"%llu:%llu LOG_SM\n",
	(u_longlong_t)txg, (u_longlong_t)offset,
	(u_longlong_t)size, (u_longlong_t)mv->mv_vdid,
	(u_longlong_t)mv->mv_msid);
	} else {
	range_tree_remove(mv->mv_allocated,
	offset, size);
	}
	}

	if (sme->sme_type != SM_ALLOC) {
	/*
	* If something is freed in the spacemap, verify that
	* it is not listed as allocated in the livelist.
	*/
	verify_livelist_allocs(mv, txg, offset, size);
	}
	return (0);
	}

	static int
	spacemap_check_sm_log_cb(spa_t spa, space_map_entry_t sme,
	uint64_t txg, void *arg)
	{
	metaslab_verify_t *mv = arg;
	uint64_t offset = sme->sme_offset;
	uint64_t vdev_id = sme->sme_vdev;

	vdev_t *vd = vdev_lookup_top(spa, vdev_id);

	/* skip indirect vdevs */
	if (!vdev_is_concrete(vd))
	return (0);

	if (vdev_id != mv->mv_vdid)
	return (0);

	metaslab_t *ms = vd->vdev_ms[offset >> vd->vdev_ms_shift];
	if (ms->ms_id != mv->mv_msid)
	return (0);

	if (txg < metaslab_unflushed_txg(ms))
	return (0);


	ASSERT3U(txg, ==, sme->sme_txg);
	return (metaslab_spacemap_validation_cb(sme, mv));
	}

	static void
	spacemap_check_sm_log(spa_t spa, metaslab_verify_t mv)
	{
	iterate_through_spacemap_logs(spa, spacemap_check_sm_log_cb, mv);
	}

	static void
	spacemap_check_ms_sm(space_map_t sm, metaslab_verify_t mv)
	{
	if (sm == NULL)
	return;

	VERIFY0(space_map_iterate(sm, space_map_length(sm),
	metaslab_spacemap_validation_cb, mv));
	}

	static void iterate_deleted_livelists(spa_t spa, ll_iter_t func, void arg);

	/*
	* Transfer blocks from sv_leftover tree to the mv_livelist_allocs if
	* they are part of that metaslab (mv_msid).
	*/
	static void
	mv_populate_livelist_allocs(metaslab_verify_t mv, sublivelist_verify_t sv)
	{
	zfs_btree_index_t where;
	sublivelist_verify_block_t *svb;
	ASSERT3U(zfs_btree_numnodes(&mv->mv_livelist_allocs), ==, 0);
	for (svb = zfs_btree_first(&sv->sv_leftover, &where);
	svb != NULL;
	svb = zfs_btree_next(&sv->sv_leftover, &where, &where)) {
	if (DVA_GET_VDEV(&svb->svb_dva) != mv->mv_vdid)
	continue;

	if (DVA_GET_OFFSET(&svb->svb_dva) < mv->mv_start &&
	(DVA_GET_OFFSET(&svb->svb_dva) +
	DVA_GET_ASIZE(&svb->svb_dva)) > mv->mv_start) {
	(void) printf("ERROR: Found block that crosses "
	"metaslab boundary: <%llu:%llx:%llx>\n",
	(u_longlong_t)DVA_GET_VDEV(&svb->svb_dva),
	(u_longlong_t)DVA_GET_OFFSET(&svb->svb_dva),
	(u_longlong_t)DVA_GET_ASIZE(&svb->svb_dva));
	continue;
	}

	if (DVA_GET_OFFSET(&svb->svb_dva) < mv->mv_start)
	continue;

	if (DVA_GET_OFFSET(&svb->svb_dva) >= mv->mv_end)
	continue;

	if ((DVA_GET_OFFSET(&svb->svb_dva) +
	DVA_GET_ASIZE(&svb->svb_dva)) > mv->mv_end) {
	(void) printf("ERROR: Found block that crosses "
	"metaslab boundary: <%llu:%llx:%llx>\n",
	(u_longlong_t)DVA_GET_VDEV(&svb->svb_dva),
	(u_longlong_t)DVA_GET_OFFSET(&svb->svb_dva),
	(u_longlong_t)DVA_GET_ASIZE(&svb->svb_dva));
	continue;
	}

	zfs_btree_add(&mv->mv_livelist_allocs, svb);
	}

	for (svb = zfs_btree_first(&mv->mv_livelist_allocs, &where);
	svb != NULL;
	svb = zfs_btree_next(&mv->mv_livelist_allocs, &where, &where)) {
	zfs_btree_remove(&sv->sv_leftover, svb);
	}
	}

	/*
	* [Livelist Check]
	* Iterate through all the sublivelists and:
	* - report leftover frees (**)
	* - record leftover ALLOCs together with their TXG [see Cross Check]
	*
	* (**) Note: Double ALLOCs are valid in datasets that have dedup
	* enabled. Similarly double FREEs are allowed as well but
	* only if they pair up with a corresponding ALLOC entry once
	* we our done with our sublivelist iteration.
	*
	* [Spacemap Check]
	* for each metaslab:
	* - iterate over spacemap and then the metaslab's entries in the
	* spacemap log, then report any double FREEs and ALLOCs (do not
	* blow up).
	*
	* [Cross Check]
	* After finishing the Livelist Check phase and while being in the
	* Spacemap Check phase, we find all the recorded leftover ALLOCs
	* of the livelist check that are part of the metaslab that we are
	* currently looking at in the Spacemap Check. We report any entries
	* that are marked as ALLOCs in the livelists but have been actually
	* freed (and potentially allocated again) after their TXG stamp in
	* the spacemaps. Also report any ALLOCs from the livelists that
	* belong to indirect vdevs (e.g. their vdev completed removal).
	*
	* Note that this will miss Log Spacemap entries that cancelled each other
	* out before being flushed to the metaslab, so we are not guaranteed
	* to match all erroneous ALLOCs.
	*/
	static void
	livelist_metaslab_validate(spa_t *spa)
	{
	(void) printf("Verifying deleted livelist entries\n");

	sublivelist_verify_t sv;
	zfs_btree_create(&sv.sv_leftover, livelist_block_compare,
	sizeof (sublivelist_verify_block_t));
	iterate_deleted_livelists(spa, livelist_verify, &sv);

	(void) printf("Verifying metaslab entries\n");
	vdev_t *rvd = spa->spa_root_vdev;
	for (uint64_t c = 0; c < rvd->vdev_children; c++) {
	vdev_t *vd = rvd->vdev_child[c];

	if (!vdev_is_concrete(vd))
	continue;

	for (uint64_t mid = 0; mid < vd->vdev_ms_count; mid++) {
	metaslab_t *m = vd->vdev_ms[mid];

	(void) fprintf(stderr,
	"\rverifying concrete vdev %llu, "
	"metaslab %llu of %llu ...",
	(longlong_t)vd->vdev_id,
	(longlong_t)mid,
	(longlong_t)vd->vdev_ms_count);

	uint64_t shift, start;
	range_seg_type_t type =
	metaslab_calculate_range_tree_type(vd, m,
	&start, &shift);
	metaslab_verify_t mv;
	mv.mv_allocated = range_tree_create(NULL,
	type, NULL, start, shift);
	mv.mv_vdid = vd->vdev_id;
	mv.mv_msid = m->ms_id;
	mv.mv_start = m->ms_start;
	mv.mv_end = m->ms_start + m->ms_size;
	zfs_btree_create(&mv.mv_livelist_allocs,
	livelist_block_compare,
	sizeof (sublivelist_verify_block_t));

	mv_populate_livelist_allocs(&mv, &sv);

	spacemap_check_ms_sm(m->ms_sm, &mv);
	spacemap_check_sm_log(spa, &mv);

	range_tree_vacate(mv.mv_allocated, NULL, NULL);
	range_tree_destroy(mv.mv_allocated);
	zfs_btree_clear(&mv.mv_livelist_allocs);
	zfs_btree_destroy(&mv.mv_livelist_allocs);
	}
	}
	(void) fprintf(stderr, "\n");

	/*
	* If there are any segments in the leftover tree after we walked
	* through all the metaslabs in the concrete vdevs then this means
	* that we have segments in the livelists that belong to indirect
	* vdevs and are marked as allocated.
	*/
	if (zfs_btree_numnodes(&sv.sv_leftover) == 0) {
	zfs_btree_destroy(&sv.sv_leftover);
	return;
	}
	(void) printf("ERROR: Found livelist blocks marked as allocated "
	"for indirect vdevs:\n");

	zfs_btree_index_t *where = NULL;
	sublivelist_verify_block_t *svb;
	while ((svb = zfs_btree_destroy_nodes(&sv.sv_leftover, &where)) !=
	NULL) {
	int vdev_id = DVA_GET_VDEV(&svb->svb_dva);
	ASSERT3U(vdev_id, <, rvd->vdev_children);
	vdev_t *vd = rvd->vdev_child[vdev_id];
	ASSERT(!vdev_is_concrete(vd));
	(void) printf("<%d:%llx:%llx> TXG %llx\n",
	vdev_id, (u_longlong_t)DVA_GET_OFFSET(&svb->svb_dva),
	(u_longlong_t)DVA_GET_ASIZE(&svb->svb_dva),
	(u_longlong_t)svb->svb_allocated_txg);
	}
	(void) printf("\n");
	zfs_btree_destroy(&sv.sv_leftover);
	}

	/*
	* These libumem hooks provide a reasonable set of defaults for the allocator's
	* debugging facilities.
	*/
	const char *
	_umem_debug_init(void)
	{
	return ("default,verbose"); /* $UMEM_DEBUG setting */
	}

	const char *
	_umem_logging_init(void)
	{
	return ("fail,contents"); /* $UMEM_LOGGING setting */
	}

	static void
	usage(void)
	{
	(void) fprintf(stderr,
	"Usage:\t%s [-AbcdDFGhikLMPsvXy] [-e [-V] [-p <path> ...]] "
	"[-I <inflight I/Os>]\n"
	"\t\t[-o <var>=<value>]... [-t <txg>] [-U <cache>] [-x <dumpdir>]\n"
	"\t\t[<poolname>[/<dataset \| objset id>] [<object \| range> ...]]\n"
	"\t%s [-AdiPv] [-e [-V] [-p <path> ...]] [-U <cache>]\n"
	"\t\t[<poolname>[/<dataset \| objset id>] [<object \| range> ...]\n"
	"\t%s [-v] <bookmark>\n"
	"\t%s -C [-A] [-U <cache>]\n"
	"\t%s -l [-Aqu] <device>\n"
	"\t%s -m [-AFLPX] [-e [-V] [-p <path> ...]] [-t <txg>] "
	"[-U <cache>]\n\t\t<poolname> [<vdev> [<metaslab> ...]]\n"
	"\t%s -O <dataset> <path>\n"
	"\t%s -r <dataset> <path> <destination>\n"
	"\t%s -R [-A] [-e [-V] [-p <path> ...]] [-U <cache>]\n"
	"\t\t<poolname> <vdev>:<offset>:<size>[:<flags>]\n"
	"\t%s -E [-A] word0:word1:...:word15\n"
	"\t%s -S [-AP] [-e [-V] [-p <path> ...]] [-U <cache>] "
	"<poolname>\n\n",
	cmdname, cmdname, cmdname, cmdname, cmdname, cmdname, cmdname,
	cmdname, cmdname, cmdname, cmdname);

	(void) fprintf(stderr, " Dataset name must include at least one "
	"separator character '/' or '@'\n");
	(void) fprintf(stderr, " If dataset name is specified, only that "
	"dataset is dumped\n");
	(void) fprintf(stderr, " If object numbers or object number "
	"ranges are specified, only those\n"
	" objects or ranges are dumped.\n\n");
	(void) fprintf(stderr,
	" Object ranges take the form <start>:<end>[:<flags>]\n"
	" start Starting object number\n"
	" end Ending object number, or -1 for no upper bound\n"
	" flags Optional flags to select object types:\n"
	" A All objects (this is the default)\n"
	" d ZFS directories\n"
	" f ZFS files \n"
	" m SPA space maps\n"
	" z ZAPs\n"
	" - Negate effect of next flag\n\n");
	(void) fprintf(stderr, " Options to control amount of output:\n");
	(void) fprintf(stderr, " -b block statistics\n");
	(void) fprintf(stderr, " -c checksum all metadata (twice for "
	"all data) blocks\n");
	(void) fprintf(stderr, " -C config (or cachefile if alone)\n");
	(void) fprintf(stderr, " -d dataset(s)\n");
	(void) fprintf(stderr, " -D dedup statistics\n");
	(void) fprintf(stderr, " -E decode and display block from an "
	"embedded block pointer\n");
	(void) fprintf(stderr, " -h pool history\n");
	(void) fprintf(stderr, " -i intent logs\n");
	(void) fprintf(stderr, " -l read label contents\n");
	(void) fprintf(stderr, " -k examine the checkpointed state "
	"of the pool\n");
	(void) fprintf(stderr, " -L disable leak tracking (do not "
	"load spacemaps)\n");
	(void) fprintf(stderr, " -m metaslabs\n");
	(void) fprintf(stderr, " -M metaslab groups\n");
	(void) fprintf(stderr, " -O perform object lookups by path\n");
	(void) fprintf(stderr, " -r copy an object by path to file\n");
	(void) fprintf(stderr, " -R read and display block from a "
	"device\n");
	(void) fprintf(stderr, " -s report stats on zdb's I/O\n");
	(void) fprintf(stderr, " -S simulate dedup to measure effect\n");
	(void) fprintf(stderr, " -v verbose (applies to all "
	"others)\n");
	(void) fprintf(stderr, " -y perform livelist and metaslab "
	"validation on any livelists being deleted\n\n");
	(void) fprintf(stderr, " Below options are intended for use "
	"with other options:\n");
	(void) fprintf(stderr, " -A ignore assertions (-A), enable "
	"panic recovery (-AA) or both (-AAA)\n");
	(void) fprintf(stderr, " -e pool is exported/destroyed/"
	"has altroot/not in a cachefile\n");
	(void) fprintf(stderr, " -F attempt automatic rewind within "
	"safe range of transaction groups\n");
	(void) fprintf(stderr, " -G dump zfs_dbgmsg buffer before "
	"exiting\n");
	(void) fprintf(stderr, " -I <number of inflight I/Os> -- "
	"specify the maximum number of\n "
	"checksumming I/Os [default is 200]\n");
	(void) fprintf(stderr, " -o <variable>=<value> set global "
	"variable to an unsigned 32-bit integer\n");
	(void) fprintf(stderr, " -p <path> -- use one or more with "
	"-e to specify path to vdev dir\n");
	(void) fprintf(stderr, " -P print numbers in parseable form\n");
	(void) fprintf(stderr, " -q don't print label contents\n");
	(void) fprintf(stderr, " -t <txg> -- highest txg to use when "
	"searching for uberblocks\n");
	(void) fprintf(stderr, " -u uberblock\n");
	(void) fprintf(stderr, " -U <cachefile_path> -- use alternate "
	"cachefile\n");
	(void) fprintf(stderr, " -V do verbatim import\n");
	(void) fprintf(stderr, " -x <dumpdir> -- "
	"dump all read blocks into specified directory\n");
	(void) fprintf(stderr, " -X attempt extreme rewind (does not "
	"work with dataset)\n");
	(void) fprintf(stderr, " -Y attempt all reconstruction "
	"combinations for split blocks\n");
	(void) fprintf(stderr, " -Z show ZSTD headers \n");
	(void) fprintf(stderr, "Specify an option more than once (e.g. -bb) "
	"to make only that option verbose\n");
	(void) fprintf(stderr, "Default is to dump everything non-verbosely\n");
	exit(1);
	}

	static void
	dump_debug_buffer(void)
	{
	if (dump_opt['G']) {
	(void) printf("\n");
	(void) fflush(stdout);
	zfs_dbgmsg_print("zdb");
	}
	}

	/*
	* Called for usage errors that are discovered after a call to spa_open(),
	* dmu_bonus_hold(), or pool_match(). abort() is called for other errors.
	*/

	static void
	fatal(const char *fmt, ...)
	{
	va_list ap;

	va_start(ap, fmt);
	(void) fprintf(stderr, "%s: ", cmdname);
	(void) vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void) fprintf(stderr, "\n");

	dump_debug_buffer();

	exit(1);
	}

	/* ARGSUSED */
	static void
	dump_packed_nvlist(objset_t os, uint64_t object, void data, size_t size)
	{
	nvlist_t *nv;
	size_t nvsize = (uint64_t )data;
	char *packed = umem_alloc(nvsize, UMEM_NOFAIL);

	VERIFY(0 == dmu_read(os, object, 0, nvsize, packed, DMU_READ_PREFETCH));

	VERIFY(nvlist_unpack(packed, nvsize, &nv, 0) == 0);

	umem_free(packed, nvsize);

	dump_nvlist(nv, 8);

	nvlist_free(nv);
	}

	/* ARGSUSED */
	static void
	dump_history_offsets(objset_t os, uint64_t object, void data, size_t size)
	{
	spa_history_phys_t *shp = data;

	if (shp == NULL)
	return;

	(void) printf("\t\tpool_create_len = %llu\n",
	(u_longlong_t)shp->sh_pool_create_len);
	(void) printf("\t\tphys_max_off = %llu\n",
	(u_longlong_t)shp->sh_phys_max_off);
	(void) printf("\t\tbof = %llu\n",
	(u_longlong_t)shp->sh_bof);
	(void) printf("\t\teof = %llu\n",
	(u_longlong_t)shp->sh_eof);
	(void) printf("\t\trecords_lost = %llu\n",
	(u_longlong_t)shp->sh_records_lost);
	}

	static void
	zdb_nicenum(uint64_t num, char *buf, size_t buflen)
	{
	if (dump_opt['P'])
	(void) snprintf(buf, buflen, "%llu", (longlong_t)num);
	else
	nicenum(num, buf, sizeof (buf));
	}

	static const char histo_stars[] = "****************************************";
	static const uint64_t histo_width = sizeof (histo_stars) - 1;

	static void
	dump_histogram(const uint64_t *histo, int size, int offset)
	{
	int i;
	int minidx = size - 1;
	int maxidx = 0;
	uint64_t max = 0;

	for (i = 0; i < size; i++) {
	if (histo[i] > max)
	max = histo[i];
	if (histo[i] > 0 && i > maxidx)
	maxidx = i;
	if (histo[i] > 0 && i < minidx)
	minidx = i;
	}

	if (max < histo_width)
	max = histo_width;

	for (i = minidx; i <= maxidx; i++) {
	(void) printf("\t\t\t%3u: %6llu %s\n",
	i + offset, (u_longlong_t)histo[i],
	&histo_stars[(max - histo[i]) * histo_width / max]);
	}
	}

	static void
	dump_zap_stats(objset_t *os, uint64_t object)
	{
	int error;
	zap_stats_t zs;

	error = zap_get_stats(os, object, &zs);
	if (error)
	return;

	if (zs.zs_ptrtbl_len == 0) {
	ASSERT(zs.zs_num_blocks == 1);
	(void) printf("\tmicrozap: %llu bytes, %llu entries\n",
	(u_longlong_t)zs.zs_blocksize,
	(u_longlong_t)zs.zs_num_entries);
	return;
	}

	(void) printf("\tFat ZAP stats:\n");

	(void) printf("\t\tPointer table:\n");
	(void) printf("\t\t\t%llu elements\n",
	(u_longlong_t)zs.zs_ptrtbl_len);
	(void) printf("\t\t\tzt_blk: %llu\n",
	(u_longlong_t)zs.zs_ptrtbl_zt_blk);
	(void) printf("\t\t\tzt_numblks: %llu\n",
	(u_longlong_t)zs.zs_ptrtbl_zt_numblks);
	(void) printf("\t\t\tzt_shift: %llu\n",
	(u_longlong_t)zs.zs_ptrtbl_zt_shift);
	(void) printf("\t\t\tzt_blks_copied: %llu\n",
	(u_longlong_t)zs.zs_ptrtbl_blks_copied);
	(void) printf("\t\t\tzt_nextblk: %llu\n",
	(u_longlong_t)zs.zs_ptrtbl_nextblk);

	(void) printf("\t\tZAP entries: %llu\n",
	(u_longlong_t)zs.zs_num_entries);
	(void) printf("\t\tLeaf blocks: %llu\n",
	(u_longlong_t)zs.zs_num_leafs);
	(void) printf("\t\tTotal blocks: %llu\n",
	(u_longlong_t)zs.zs_num_blocks);
	(void) printf("\t\tzap_block_type: 0x%llx\n",
	(u_longlong_t)zs.zs_block_type);
	(void) printf("\t\tzap_magic: 0x%llx\n",
	(u_longlong_t)zs.zs_magic);
	(void) printf("\t\tzap_salt: 0x%llx\n",
	(u_longlong_t)zs.zs_salt);

	(void) printf("\t\tLeafs with 2^n pointers:\n");
	dump_histogram(zs.zs_leafs_with_2n_pointers, ZAP_HISTOGRAM_SIZE, 0);

	(void) printf("\t\tBlocks with n*5 entries:\n");
	dump_histogram(zs.zs_blocks_with_n5_entries, ZAP_HISTOGRAM_SIZE, 0);

	(void) printf("\t\tBlocks n/10 full:\n");
	dump_histogram(zs.zs_blocks_n_tenths_full, ZAP_HISTOGRAM_SIZE, 0);

	(void) printf("\t\tEntries with n chunks:\n");
	dump_histogram(zs.zs_entries_using_n_chunks, ZAP_HISTOGRAM_SIZE, 0);

	(void) printf("\t\tBuckets with n entries:\n");
	dump_histogram(zs.zs_buckets_with_n_entries, ZAP_HISTOGRAM_SIZE, 0);
	}

	/ARGSUSED/
	static void
	dump_none(objset_t os, uint64_t object, void data, size_t size)
	{
	}

	/ARGSUSED/
	static void
	dump_unknown(objset_t os, uint64_t object, void data, size_t size)
	{
	(void) printf("\tUNKNOWN OBJECT TYPE\n");
	}

	/ARGSUSED/
	static void
	dump_uint8(objset_t os, uint64_t object, void data, size_t size)
	{
	}

	/ARGSUSED/
	static void
	dump_uint64(objset_t os, uint64_t object, void data, size_t size)
	{
	uint64_t *arr;
	uint64_t oursize;
	if (dump_opt['d'] < 6)
	return;

	if (data == NULL) {
	dmu_object_info_t doi;

	VERIFY0(dmu_object_info(os, object, &doi));
	size = doi.doi_max_offset;
	/*
	* We cap the size at 1 mebibyte here to prevent
	* allocation failures and nigh-infinite printing if the
	* object is extremely large.
	*/
	oursize = MIN(size, 1 << 20);
	arr = kmem_alloc(oursize, KM_SLEEP);

	int err = dmu_read(os, object, 0, oursize, arr, 0);
	if (err != 0) {
	(void) printf("got error %u from dmu_read\n", err);
	kmem_free(arr, oursize);
	return;
	}
	} else {
	/*
	* Even though the allocation is already done in this code path,
	* we still cap the size to prevent excessive printing.
	*/
	oursize = MIN(size, 1 << 20);
	arr = data;
	}

	if (size == 0) {
	(void) printf("\t\t[]\n");
	return;
	}

	(void) printf("\t\t[%0llx", (u_longlong_t)arr[0]);
	for (size_t i = 1; i * sizeof (uint64_t) < oursize; i++) {
	if (i % 4 != 0)
	(void) printf(", %0llx", (u_longlong_t)arr[i]);
	else
	(void) printf(",\n\t\t%0llx", (u_longlong_t)arr[i]);
	}
	if (oursize != size)
	(void) printf(", ... ");
	(void) printf("]\n");

	if (data == NULL)
	kmem_free(arr, oursize);
	}

	/ARGSUSED/
	static void
	dump_zap(objset_t os, uint64_t object, void data, size_t size)
	{
	zap_cursor_t zc;
	zap_attribute_t attr;
	void *prop;
	unsigned i;

	dump_zap_stats(os, object);
	(void) printf("\n");

	for (zap_cursor_init(&zc, os, object);
	zap_cursor_retrieve(&zc, &attr) == 0;
	zap_cursor_advance(&zc)) {
	(void) printf("\t\t%s = ", attr.za_name);
	if (attr.za_num_integers == 0) {
	(void) printf("\n");
	continue;
	}
	prop = umem_zalloc(attr.za_num_integers *
	attr.za_integer_length, UMEM_NOFAIL);
	(void) zap_lookup(os, object, attr.za_name,
	attr.za_integer_length, attr.za_num_integers, prop);
	if (attr.za_integer_length == 1) {
	if (strcmp(attr.za_name,
	DSL_CRYPTO_KEY_MASTER_KEY) == 0 \|\|
	strcmp(attr.za_name,
	DSL_CRYPTO_KEY_HMAC_KEY) == 0 \|\|
	strcmp(attr.za_name, DSL_CRYPTO_KEY_IV) == 0 \|\|
	strcmp(attr.za_name, DSL_CRYPTO_KEY_MAC) == 0 \|\|
	strcmp(attr.za_name, DMU_POOL_CHECKSUM_SALT) == 0) {
	uint8_t *u8 = prop;

	for (i = 0; i < attr.za_num_integers; i++) {
	(void) printf("%02x", u8[i]);
	}
	} else {
	(void) printf("%s", (char *)prop);
	}
	} else {
	for (i = 0; i < attr.za_num_integers; i++) {
	switch (attr.za_integer_length) {
	case 2:
	(void) printf("%u ",
	((uint16_t *)prop)[i]);
	break;
	case 4:
	(void) printf("%u ",
	((uint32_t *)prop)[i]);
	break;
	case 8:
	(void) printf("%lld ",
	(u_longlong_t)((int64_t *)prop)[i]);
	break;
	}
	}
	}
	(void) printf("\n");
	umem_free(prop, attr.za_num_integers * attr.za_integer_length);
	}
	zap_cursor_fini(&zc);
	}

	static void
	dump_bpobj(objset_t os, uint64_t object, void data, size_t size)
	{
	bpobj_phys_t *bpop = data;
	uint64_t i;
	char bytes[32], comp[32], uncomp[32];

	/* make sure the output won't get truncated */
	CTASSERT(sizeof (bytes) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (comp) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (uncomp) >= NN_NUMBUF_SZ);

	if (bpop == NULL)
	return;

	zdb_nicenum(bpop->bpo_bytes, bytes, sizeof (bytes));
	zdb_nicenum(bpop->bpo_comp, comp, sizeof (comp));
	zdb_nicenum(bpop->bpo_uncomp, uncomp, sizeof (uncomp));

	(void) printf("\t\tnum_blkptrs = %llu\n",
	(u_longlong_t)bpop->bpo_num_blkptrs);
	(void) printf("\t\tbytes = %s\n", bytes);
	if (size >= BPOBJ_SIZE_V1) {
	(void) printf("\t\tcomp = %s\n", comp);
	(void) printf("\t\tuncomp = %s\n", uncomp);
	}
	if (size >= BPOBJ_SIZE_V2) {
	(void) printf("\t\tsubobjs = %llu\n",
	(u_longlong_t)bpop->bpo_subobjs);
	(void) printf("\t\tnum_subobjs = %llu\n",
	(u_longlong_t)bpop->bpo_num_subobjs);
	}
	if (size >= sizeof (*bpop)) {
	(void) printf("\t\tnum_freed = %llu\n",
	(u_longlong_t)bpop->bpo_num_freed);
	}

	if (dump_opt['d'] < 5)
	return;

	for (i = 0; i < bpop->bpo_num_blkptrs; i++) {
	char blkbuf[BP_SPRINTF_LEN];
	blkptr_t bp;

	int err = dmu_read(os, object,
	i * sizeof (bp), sizeof (bp), &bp, 0);
	if (err != 0) {
	(void) printf("got error %u from dmu_read\n", err);
	break;
	}
	snprintf_blkptr_compact(blkbuf, sizeof (blkbuf), &bp,
	BP_GET_FREE(&bp));
	(void) printf("\t%s\n", blkbuf);
	}
	}

	/* ARGSUSED */
	static void
	dump_bpobj_subobjs(objset_t os, uint64_t object, void data, size_t size)
	{
	dmu_object_info_t doi;
	int64_t i;

	VERIFY0(dmu_object_info(os, object, &doi));
	uint64_t *subobjs = kmem_alloc(doi.doi_max_offset, KM_SLEEP);

	int err = dmu_read(os, object, 0, doi.doi_max_offset, subobjs, 0);
	if (err != 0) {
	(void) printf("got error %u from dmu_read\n", err);
	kmem_free(subobjs, doi.doi_max_offset);
	return;
	}

	int64_t last_nonzero = -1;
	for (i = 0; i < doi.doi_max_offset / 8; i++) {
	if (subobjs[i] != 0)
	last_nonzero = i;
	}

	for (i = 0; i <= last_nonzero; i++) {
	(void) printf("\t%llu\n", (u_longlong_t)subobjs[i]);
	}
	kmem_free(subobjs, doi.doi_max_offset);
	}

	/ARGSUSED/
	static void
	dump_ddt_zap(objset_t os, uint64_t object, void data, size_t size)
	{
	dump_zap_stats(os, object);
	/* contents are printed elsewhere, properly decoded */
	}

	/ARGSUSED/
	static void
	dump_sa_attrs(objset_t os, uint64_t object, void data, size_t size)
	{
	zap_cursor_t zc;
	zap_attribute_t attr;

	dump_zap_stats(os, object);
	(void) printf("\n");

	for (zap_cursor_init(&zc, os, object);
	zap_cursor_retrieve(&zc, &attr) == 0;
	zap_cursor_advance(&zc)) {
	(void) printf("\t\t%s = ", attr.za_name);
	if (attr.za_num_integers == 0) {
	(void) printf("\n");
	continue;
	}
	(void) printf(" %llx : [%d:%d:%d]\n",
	(u_longlong_t)attr.za_first_integer,
	(int)ATTR_LENGTH(attr.za_first_integer),
	(int)ATTR_BSWAP(attr.za_first_integer),
	(int)ATTR_NUM(attr.za_first_integer));
	}
	zap_cursor_fini(&zc);
	}

	/ARGSUSED/
	static void
	dump_sa_layouts(objset_t os, uint64_t object, void data, size_t size)
	{
	zap_cursor_t zc;
	zap_attribute_t attr;
	uint16_t *layout_attrs;
	unsigned i;

	dump_zap_stats(os, object);
	(void) printf("\n");

	for (zap_cursor_init(&zc, os, object);
	zap_cursor_retrieve(&zc, &attr) == 0;
	zap_cursor_advance(&zc)) {
	(void) printf("\t\t%s = [", attr.za_name);
	if (attr.za_num_integers == 0) {
	(void) printf("\n");
	continue;
	}

	VERIFY(attr.za_integer_length == 2);
	layout_attrs = umem_zalloc(attr.za_num_integers *
	attr.za_integer_length, UMEM_NOFAIL);

	VERIFY(zap_lookup(os, object, attr.za_name,
	attr.za_integer_length,
	attr.za_num_integers, layout_attrs) == 0);

	for (i = 0; i != attr.za_num_integers; i++)
	(void) printf(" %d ", (int)layout_attrs[i]);
	(void) printf("]\n");
	umem_free(layout_attrs,
	attr.za_num_integers * attr.za_integer_length);
	}
	zap_cursor_fini(&zc);
	}

	/ARGSUSED/
	static void
	dump_zpldir(objset_t os, uint64_t object, void data, size_t size)
	{
	zap_cursor_t zc;
	zap_attribute_t attr;
	const char *typenames[] = {
	/* 0 */ "not specified",
	/* 1 */ "FIFO",
	/* 2 */ "Character Device",
	/* 3 */ "3 (invalid)",
	/* 4 */ "Directory",
	/* 5 */ "5 (invalid)",
	/* 6 */ "Block Device",
	/* 7 */ "7 (invalid)",
	/* 8 */ "Regular File",
	/* 9 */ "9 (invalid)",
	/* 10 */ "Symbolic Link",
	/* 11 */ "11 (invalid)",
	/* 12 */ "Socket",
	/* 13 */ "Door",
	/* 14 */ "Event Port",
	/* 15 */ "15 (invalid)",
	};

	dump_zap_stats(os, object);
	(void) printf("\n");

	for (zap_cursor_init(&zc, os, object);
	zap_cursor_retrieve(&zc, &attr) == 0;
	zap_cursor_advance(&zc)) {
	(void) printf("\t\t%s = %lld (type: %s)\n",
	attr.za_name, ZFS_DIRENT_OBJ(attr.za_first_integer),
	typenames[ZFS_DIRENT_TYPE(attr.za_first_integer)]);
	}
	zap_cursor_fini(&zc);
	}

	static int
	get_dtl_refcount(vdev_t *vd)
	{
	int refcount = 0;

	if (vd->vdev_ops->vdev_op_leaf) {
	space_map_t *sm = vd->vdev_dtl_sm;

	if (sm != NULL &&
	sm->sm_dbuf->db_size == sizeof (space_map_phys_t))
	return (1);
	return (0);
	}

	for (unsigned c = 0; c < vd->vdev_children; c++)
	refcount += get_dtl_refcount(vd->vdev_child[c]);
	return (refcount);
	}

	static int
	get_metaslab_refcount(vdev_t *vd)
	{
	int refcount = 0;

	if (vd->vdev_top == vd) {
	for (uint64_t m = 0; m < vd->vdev_ms_count; m++) {
	space_map_t *sm = vd->vdev_ms[m]->ms_sm;

	if (sm != NULL &&
	sm->sm_dbuf->db_size == sizeof (space_map_phys_t))
	refcount++;
	}
	}
	for (unsigned c = 0; c < vd->vdev_children; c++)
	refcount += get_metaslab_refcount(vd->vdev_child[c]);

	return (refcount);
	}

	static int
	get_obsolete_refcount(vdev_t *vd)
	{
	uint64_t obsolete_sm_object;
	int refcount = 0;

	VERIFY0(vdev_obsolete_sm_object(vd, &obsolete_sm_object));
	if (vd->vdev_top == vd && obsolete_sm_object != 0) {
	dmu_object_info_t doi;
	VERIFY0(dmu_object_info(vd->vdev_spa->spa_meta_objset,
	obsolete_sm_object, &doi));
	if (doi.doi_bonus_size == sizeof (space_map_phys_t)) {
	refcount++;
	}
	} else {
	ASSERT3P(vd->vdev_obsolete_sm, ==, NULL);
	ASSERT3U(obsolete_sm_object, ==, 0);
	}
	for (unsigned c = 0; c < vd->vdev_children; c++) {
	refcount += get_obsolete_refcount(vd->vdev_child[c]);
	}

	return (refcount);
	}

	static int
	get_prev_obsolete_spacemap_refcount(spa_t *spa)
	{
	uint64_t prev_obj =
	spa->spa_condensing_indirect_phys.scip_prev_obsolete_sm_object;
	if (prev_obj != 0) {
	dmu_object_info_t doi;
	VERIFY0(dmu_object_info(spa->spa_meta_objset, prev_obj, &doi));
	if (doi.doi_bonus_size == sizeof (space_map_phys_t)) {
	return (1);
	}
	}
	return (0);
	}

	static int
	get_checkpoint_refcount(vdev_t *vd)
	{
	int refcount = 0;

	if (vd->vdev_top == vd && vd->vdev_top_zap != 0 &&
	zap_contains(spa_meta_objset(vd->vdev_spa),
	vd->vdev_top_zap, VDEV_TOP_ZAP_POOL_CHECKPOINT_SM) == 0)
	refcount++;

	for (uint64_t c = 0; c < vd->vdev_children; c++)
	refcount += get_checkpoint_refcount(vd->vdev_child[c]);

	return (refcount);
	}

	static int
	get_log_spacemap_refcount(spa_t *spa)
	{
	return (avl_numnodes(&spa->spa_sm_logs_by_txg));
	}

	static int
	verify_spacemap_refcounts(spa_t *spa)
	{
	uint64_t expected_refcount = 0;
	uint64_t actual_refcount;

	(void) feature_get_refcount(spa,
	&spa_feature_table[SPA_FEATURE_SPACEMAP_HISTOGRAM],
	&expected_refcount);
	actual_refcount = get_dtl_refcount(spa->spa_root_vdev);
	actual_refcount += get_metaslab_refcount(spa->spa_root_vdev);
	actual_refcount += get_obsolete_refcount(spa->spa_root_vdev);
	actual_refcount += get_prev_obsolete_spacemap_refcount(spa);
	actual_refcount += get_checkpoint_refcount(spa->spa_root_vdev);
	actual_refcount += get_log_spacemap_refcount(spa);

	if (expected_refcount != actual_refcount) {
	(void) printf("space map refcount mismatch: expected %lld != "
	"actual %lld\n",
	(longlong_t)expected_refcount,
	(longlong_t)actual_refcount);
	return (2);
	}
	return (0);
	}

	static void
	dump_spacemap(objset_t os, space_map_t sm)
	{
	const char *ddata[] = { "ALLOC", "FREE", "CONDENSE", "INVALID",
	"INVALID", "INVALID", "INVALID", "INVALID" };

	if (sm == NULL)
	return;

	(void) printf("space map object %llu:\n",
	(longlong_t)sm->sm_object);
	(void) printf(" smp_length = 0x%llx\n",
	(longlong_t)sm->sm_phys->smp_length);
	(void) printf(" smp_alloc = 0x%llx\n",
	(longlong_t)sm->sm_phys->smp_alloc);

	if (dump_opt['d'] < 6 && dump_opt['m'] < 4)
	return;

	/*
	* Print out the freelist entries in both encoded and decoded form.
	*/
	uint8_t mapshift = sm->sm_shift;
	int64_t alloc = 0;
	uint64_t word, entry_id = 0;
	for (uint64_t offset = 0; offset < space_map_length(sm);
	offset += sizeof (word)) {

	VERIFY0(dmu_read(os, space_map_object(sm), offset,
	sizeof (word), &word, DMU_READ_PREFETCH));

	if (sm_entry_is_debug(word)) {
	uint64_t de_txg = SM_DEBUG_TXG_DECODE(word);
	uint64_t de_sync_pass = SM_DEBUG_SYNCPASS_DECODE(word);
	if (de_txg == 0) {
	(void) printf(
	"\t [%6llu] PADDING\n",
	(u_longlong_t)entry_id);
	} else {
	(void) printf(
	"\t [%6llu] %s: txg %llu pass %llu\n",
	(u_longlong_t)entry_id,
	ddata[SM_DEBUG_ACTION_DECODE(word)],
	(u_longlong_t)de_txg,
	(u_longlong_t)de_sync_pass);
	}
	entry_id++;
	continue;
	}

	uint8_t words;
	char entry_type;
	uint64_t entry_off, entry_run, entry_vdev = SM_NO_VDEVID;

	if (sm_entry_is_single_word(word)) {
	entry_type = (SM_TYPE_DECODE(word) == SM_ALLOC) ?
	'A' : 'F';
	entry_off = (SM_OFFSET_DECODE(word) << mapshift) +
	sm->sm_start;
	entry_run = SM_RUN_DECODE(word) << mapshift;
	words = 1;
	} else {
	/* it is a two-word entry so we read another word */
	ASSERT(sm_entry_is_double_word(word));

	uint64_t extra_word;
	offset += sizeof (extra_word);
	VERIFY0(dmu_read(os, space_map_object(sm), offset,
	sizeof (extra_word), &extra_word,
	DMU_READ_PREFETCH));

	ASSERT3U(offset, <=, space_map_length(sm));

	entry_run = SM2_RUN_DECODE(word) << mapshift;
	entry_vdev = SM2_VDEV_DECODE(word);
	entry_type = (SM2_TYPE_DECODE(extra_word) == SM_ALLOC) ?
	'A' : 'F';
	entry_off = (SM2_OFFSET_DECODE(extra_word) <<
	mapshift) + sm->sm_start;
	words = 2;
	}

	(void) printf("\t [%6llu] %c range:"
	" %010llx-%010llx size: %06llx vdev: %06llu words: %u\n",
	(u_longlong_t)entry_id,
	entry_type, (u_longlong_t)entry_off,
	(u_longlong_t)(entry_off + entry_run),
	(u_longlong_t)entry_run,
	(u_longlong_t)entry_vdev, words);

	if (entry_type == 'A')
	alloc += entry_run;
	else
	alloc -= entry_run;
	entry_id++;
	}
	if (alloc != space_map_allocated(sm)) {
	(void) printf("space_map_object alloc (%lld) INCONSISTENT "
	"with space map summary (%lld)\n",
	(longlong_t)space_map_allocated(sm), (longlong_t)alloc);
	}
	}

	static void
	dump_metaslab_stats(metaslab_t *msp)
	{
	char maxbuf[32];
	range_tree_t *rt = msp->ms_allocatable;
	zfs_btree_t *t = &msp->ms_allocatable_by_size;
	int free_pct = range_tree_space(rt) * 100 / msp->ms_size;

	/* max sure nicenum has enough space */
	CTASSERT(sizeof (maxbuf) >= NN_NUMBUF_SZ);

	zdb_nicenum(metaslab_largest_allocatable(msp), maxbuf, sizeof (maxbuf));

	(void) printf("\t %25s %10lu %7s %6s %4s %4d%%\n",
	"segments", zfs_btree_numnodes(t), "maxsize", maxbuf,
	"freepct", free_pct);
	(void) printf("\tIn-memory histogram:\n");
	dump_histogram(rt->rt_histogram, RANGE_TREE_HISTOGRAM_SIZE, 0);
	}

	static void
	dump_metaslab(metaslab_t *msp)
	{
	vdev_t *vd = msp->ms_group->mg_vd;
	spa_t *spa = vd->vdev_spa;
	space_map_t *sm = msp->ms_sm;
	char freebuf[32];

	zdb_nicenum(msp->ms_size - space_map_allocated(sm), freebuf,
	sizeof (freebuf));

	(void) printf(
	"\tmetaslab %6llu offset %12llx spacemap %6llu free %5s\n",
	(u_longlong_t)msp->ms_id, (u_longlong_t)msp->ms_start,
	(u_longlong_t)space_map_object(sm), freebuf);

	if (dump_opt['m'] > 2 && !dump_opt['L']) {
	mutex_enter(&msp->ms_lock);
	VERIFY0(metaslab_load(msp));
	range_tree_stat_verify(msp->ms_allocatable);
	dump_metaslab_stats(msp);
	metaslab_unload(msp);
	mutex_exit(&msp->ms_lock);
	}

	if (dump_opt['m'] > 1 && sm != NULL &&
	spa_feature_is_active(spa, SPA_FEATURE_SPACEMAP_HISTOGRAM)) {
	/*
	* The space map histogram represents free space in chunks
	* of sm_shift (i.e. bucket 0 refers to 2^sm_shift).
	*/
	(void) printf("\tOn-disk histogram:\t\tfragmentation %llu\n",
	(u_longlong_t)msp->ms_fragmentation);
	dump_histogram(sm->sm_phys->smp_histogram,
	SPACE_MAP_HISTOGRAM_SIZE, sm->sm_shift);
	}

	if (vd->vdev_ops == &vdev_draid_ops)
	ASSERT3U(msp->ms_size, <=, 1ULL << vd->vdev_ms_shift);
	else
	ASSERT3U(msp->ms_size, ==, 1ULL << vd->vdev_ms_shift);

	dump_spacemap(spa->spa_meta_objset, msp->ms_sm);

	if (spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP)) {
	(void) printf("\tFlush data:\n\tunflushed txg=%llu\n\n",
	(u_longlong_t)metaslab_unflushed_txg(msp));
	}
	}

	static void
	print_vdev_metaslab_header(vdev_t *vd)
	{
	vdev_alloc_bias_t alloc_bias = vd->vdev_alloc_bias;
	const char *bias_str = "";
	if (alloc_bias == VDEV_BIAS_LOG \|\| vd->vdev_islog) {
	bias_str = VDEV_ALLOC_BIAS_LOG;
	} else if (alloc_bias == VDEV_BIAS_SPECIAL) {
	bias_str = VDEV_ALLOC_BIAS_SPECIAL;
	} else if (alloc_bias == VDEV_BIAS_DEDUP) {
	bias_str = VDEV_ALLOC_BIAS_DEDUP;
	}

	uint64_t ms_flush_data_obj = 0;
	if (vd->vdev_top_zap != 0) {
	int error = zap_lookup(spa_meta_objset(vd->vdev_spa),
	vd->vdev_top_zap, VDEV_TOP_ZAP_MS_UNFLUSHED_PHYS_TXGS,
	sizeof (uint64_t), 1, &ms_flush_data_obj);
	if (error != ENOENT) {
	ASSERT0(error);
	}
	}

	(void) printf("\tvdev %10llu %s",
	(u_longlong_t)vd->vdev_id, bias_str);

	if (ms_flush_data_obj != 0) {
	(void) printf(" ms_unflushed_phys object %llu",
	(u_longlong_t)ms_flush_data_obj);
	}

	(void) printf("\n\t%-10s%5llu %-19s %-15s %-12s\n",
	"metaslabs", (u_longlong_t)vd->vdev_ms_count,
	"offset", "spacemap", "free");
	(void) printf("\t%15s %19s %15s %12s\n",
	"---------------", "-------------------",
	"---------------", "------------");
	}

	static void
	dump_metaslab_groups(spa_t *spa)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	metaslab_class_t *mc = spa_normal_class(spa);
	uint64_t fragmentation;

	metaslab_class_histogram_verify(mc);

	for (unsigned c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];
	metaslab_group_t *mg = tvd->vdev_mg;

	if (mg == NULL \|\| mg->mg_class != mc)
	continue;

	metaslab_group_histogram_verify(mg);
	mg->mg_fragmentation = metaslab_group_fragmentation(mg);

	(void) printf("\tvdev %10llu\t\tmetaslabs%5llu\t\t"
	"fragmentation",
	(u_longlong_t)tvd->vdev_id,
	(u_longlong_t)tvd->vdev_ms_count);
	if (mg->mg_fragmentation == ZFS_FRAG_INVALID) {
	(void) printf("%3s\n", "-");
	} else {
	(void) printf("%3llu%%\n",
	(u_longlong_t)mg->mg_fragmentation);
	}
	dump_histogram(mg->mg_histogram, RANGE_TREE_HISTOGRAM_SIZE, 0);
	}

	(void) printf("\tpool %s\tfragmentation", spa_name(spa));
	fragmentation = metaslab_class_fragmentation(mc);
	if (fragmentation == ZFS_FRAG_INVALID)
	(void) printf("\t%3s\n", "-");
	else
	(void) printf("\t%3llu%%\n", (u_longlong_t)fragmentation);
	dump_histogram(mc->mc_histogram, RANGE_TREE_HISTOGRAM_SIZE, 0);
	}

	static void
	print_vdev_indirect(vdev_t *vd)
	{
	vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
	vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
	vdev_indirect_births_t *vib = vd->vdev_indirect_births;

	if (vim == NULL) {
	ASSERT3P(vib, ==, NULL);
	return;
	}

	ASSERT3U(vdev_indirect_mapping_object(vim), ==,
	vic->vic_mapping_object);
	ASSERT3U(vdev_indirect_births_object(vib), ==,
	vic->vic_births_object);

	(void) printf("indirect births obj %llu:\n",
	(longlong_t)vic->vic_births_object);
	(void) printf(" vib_count = %llu\n",
	(longlong_t)vdev_indirect_births_count(vib));
	for (uint64_t i = 0; i < vdev_indirect_births_count(vib); i++) {
	vdev_indirect_birth_entry_phys_t *cur_vibe =
	&vib->vib_entries[i];
	(void) printf("\toffset %llx -> txg %llu\n",
	(longlong_t)cur_vibe->vibe_offset,
	(longlong_t)cur_vibe->vibe_phys_birth_txg);
	}
	(void) printf("\n");

	(void) printf("indirect mapping obj %llu:\n",
	(longlong_t)vic->vic_mapping_object);
	(void) printf(" vim_max_offset = 0x%llx\n",
	(longlong_t)vdev_indirect_mapping_max_offset(vim));
	(void) printf(" vim_bytes_mapped = 0x%llx\n",
	(longlong_t)vdev_indirect_mapping_bytes_mapped(vim));
	(void) printf(" vim_count = %llu\n",
	(longlong_t)vdev_indirect_mapping_num_entries(vim));

	if (dump_opt['d'] <= 5 && dump_opt['m'] <= 3)
	return;

	uint32_t *counts = vdev_indirect_mapping_load_obsolete_counts(vim);

	for (uint64_t i = 0; i < vdev_indirect_mapping_num_entries(vim); i++) {
	vdev_indirect_mapping_entry_phys_t *vimep =
	&vim->vim_entries[i];
	(void) printf("\t<%llx:%llx:%llx> -> "
	"<%llx:%llx:%llx> (%x obsolete)\n",
	(longlong_t)vd->vdev_id,
	(longlong_t)DVA_MAPPING_GET_SRC_OFFSET(vimep),
	(longlong_t)DVA_GET_ASIZE(&vimep->vimep_dst),
	(longlong_t)DVA_GET_VDEV(&vimep->vimep_dst),
	(longlong_t)DVA_GET_OFFSET(&vimep->vimep_dst),
	(longlong_t)DVA_GET_ASIZE(&vimep->vimep_dst),
	counts[i]);
	}
	(void) printf("\n");

	uint64_t obsolete_sm_object;
	VERIFY0(vdev_obsolete_sm_object(vd, &obsolete_sm_object));
	if (obsolete_sm_object != 0) {
	objset_t *mos = vd->vdev_spa->spa_meta_objset;
	(void) printf("obsolete space map object %llu:\n",
	(u_longlong_t)obsolete_sm_object);
	ASSERT(vd->vdev_obsolete_sm != NULL);
	ASSERT3U(space_map_object(vd->vdev_obsolete_sm), ==,
	obsolete_sm_object);
	dump_spacemap(mos, vd->vdev_obsolete_sm);
	(void) printf("\n");
	}
	}

	static void
	dump_metaslabs(spa_t *spa)
	{
	vdev_t vd, rvd = spa->spa_root_vdev;
	uint64_t m, c = 0, children = rvd->vdev_children;

	(void) printf("\nMetaslabs:\n");

	if (!dump_opt['d'] && zopt_metaslab_args > 0) {
	c = zopt_metaslab[0];

	if (c >= children)
	(void) fatal("bad vdev id: %llu", (u_longlong_t)c);

	if (zopt_metaslab_args > 1) {
	vd = rvd->vdev_child[c];
	print_vdev_metaslab_header(vd);

	for (m = 1; m < zopt_metaslab_args; m++) {
	if (zopt_metaslab[m] < vd->vdev_ms_count)
	dump_metaslab(
	vd->vdev_ms[zopt_metaslab[m]]);
	else
	(void) fprintf(stderr, "bad metaslab "
	"number %llu\n",
	(u_longlong_t)zopt_metaslab[m]);
	}
	(void) printf("\n");
	return;
	}
	children = c + 1;
	}
	for (; c < children; c++) {
	vd = rvd->vdev_child[c];
	print_vdev_metaslab_header(vd);

	print_vdev_indirect(vd);

	for (m = 0; m < vd->vdev_ms_count; m++)
	dump_metaslab(vd->vdev_ms[m]);
	(void) printf("\n");
	}
	}

	static void
	dump_log_spacemaps(spa_t *spa)
	{
	if (!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))
	return;

	(void) printf("\nLog Space Maps in Pool:\n");
	for (spa_log_sm_t *sls = avl_first(&spa->spa_sm_logs_by_txg);
	sls; sls = AVL_NEXT(&spa->spa_sm_logs_by_txg, sls)) {
	space_map_t *sm = NULL;
	VERIFY0(space_map_open(&sm, spa_meta_objset(spa),
	sls->sls_sm_obj, 0, UINT64_MAX, SPA_MINBLOCKSHIFT));

	(void) printf("Log Spacemap object %llu txg %llu\n",
	(u_longlong_t)sls->sls_sm_obj, (u_longlong_t)sls->sls_txg);
	dump_spacemap(spa->spa_meta_objset, sm);
	space_map_close(sm);
	}
	(void) printf("\n");
	}

	static void
	dump_dde(const ddt_t ddt, const ddt_entry_t dde, uint64_t index)
	{
	const ddt_phys_t *ddp = dde->dde_phys;
	const ddt_key_t *ddk = &dde->dde_key;
	const char *types[4] = { "ditto", "single", "double", "triple" };
	char blkbuf[BP_SPRINTF_LEN];
	blkptr_t blk;
	int p;

	for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
	if (ddp->ddp_phys_birth == 0)
	continue;
	ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
	snprintf_blkptr(blkbuf, sizeof (blkbuf), &blk);
	(void) printf("index %llx refcnt %llu %s %s\n",
	(u_longlong_t)index, (u_longlong_t)ddp->ddp_refcnt,
	types[p], blkbuf);
	}
	}

	static void
	dump_dedup_ratio(const ddt_stat_t *dds)
	{
	double rL, rP, rD, D, dedup, compress, copies;

	if (dds->dds_blocks == 0)
	return;

	rL = (double)dds->dds_ref_lsize;
	rP = (double)dds->dds_ref_psize;
	rD = (double)dds->dds_ref_dsize;
	D = (double)dds->dds_dsize;

	dedup = rD / D;
	compress = rL / rP;
	copies = rD / rP;

	(void) printf("dedup = %.2f, compress = %.2f, copies = %.2f, "
	"dedup * compress / copies = %.2f\n\n",
	dedup, compress, copies, dedup * compress / copies);
	}

	static void
	dump_ddt(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
	{
	char name[DDT_NAMELEN];
	ddt_entry_t dde;
	uint64_t walk = 0;
	dmu_object_info_t doi;
	uint64_t count, dspace, mspace;
	int error;

	error = ddt_object_info(ddt, type, class, &doi);

	if (error == ENOENT)
	return;
	ASSERT(error == 0);

	error = ddt_object_count(ddt, type, class, &count);
	ASSERT(error == 0);
	if (count == 0)
	return;

	dspace = doi.doi_physical_blocks_512 << 9;
	mspace = doi.doi_fill_count * doi.doi_data_block_size;

	ddt_object_name(ddt, type, class, name);

	(void) printf("%s: %llu entries, size %llu on disk, %llu in core\n",
	name,
	(u_longlong_t)count,
	(u_longlong_t)(dspace / count),
	(u_longlong_t)(mspace / count));

	if (dump_opt['D'] < 3)
	return;

	zpool_dump_ddt(NULL, &ddt->ddt_histogram[type][class]);

	if (dump_opt['D'] < 4)
	return;

	if (dump_opt['D'] < 5 && class == DDT_CLASS_UNIQUE)
	return;

	(void) printf("%s contents:\n\n", name);

	while ((error = ddt_object_walk(ddt, type, class, &walk, &dde)) == 0)
	dump_dde(ddt, &dde, walk);

	ASSERT3U(error, ==, ENOENT);

	(void) printf("\n");
	}

	static void
	dump_all_ddts(spa_t *spa)
	{
	ddt_histogram_t ddh_total;
	ddt_stat_t dds_total;

	bzero(&ddh_total, sizeof (ddh_total));
	bzero(&dds_total, sizeof (dds_total));

	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
	ddt_t *ddt = spa->spa_ddt[c];
	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
	for (enum ddt_class class = 0; class < DDT_CLASSES;
	class++) {
	dump_ddt(ddt, type, class);
	}
	}
	}

	ddt_get_dedup_stats(spa, &dds_total);

	if (dds_total.dds_blocks == 0) {
	(void) printf("All DDTs are empty\n");
	return;
	}

	(void) printf("\n");

	if (dump_opt['D'] > 1) {
	(void) printf("DDT histogram (aggregated over all DDTs):\n");
	ddt_get_dedup_histogram(spa, &ddh_total);
	zpool_dump_ddt(&dds_total, &ddh_total);
	}

	dump_dedup_ratio(&dds_total);
	}

	static void
	dump_dtl_seg(void *arg, uint64_t start, uint64_t size)
	{
	char *prefix = arg;

	(void) printf("%s [%llu,%llu) length %llu\n",
	prefix,
	(u_longlong_t)start,
	(u_longlong_t)(start + size),
	(u_longlong_t)(size));
	}

	static void
	dump_dtl(vdev_t *vd, int indent)
	{
	spa_t *spa = vd->vdev_spa;
	boolean_t required;
	const char *name[DTL_TYPES] = { "missing", "partial", "scrub",
	"outage" };
	char prefix[256];

	spa_vdev_state_enter(spa, SCL_NONE);
	required = vdev_dtl_required(vd);
	(void) spa_vdev_state_exit(spa, NULL, 0);

	if (indent == 0)
	(void) printf("\nDirty time logs:\n\n");

	(void) printf("\t%*s%s [%s]\n", indent, "",
	vd->vdev_path ? vd->vdev_path :
	vd->vdev_parent ? vd->vdev_ops->vdev_op_type : spa_name(spa),
	required ? "DTL-required" : "DTL-expendable");

	for (int t = 0; t < DTL_TYPES; t++) {
	range_tree_t *rt = vd->vdev_dtl[t];
	if (range_tree_space(rt) == 0)
	continue;
	(void) snprintf(prefix, sizeof (prefix), "\t%*s%s",
	indent + 2, "", name[t]);
	range_tree_walk(rt, dump_dtl_seg, prefix);
	if (dump_opt['d'] > 5 && vd->vdev_children == 0)
	dump_spacemap(spa->spa_meta_objset,
	vd->vdev_dtl_sm);
	}

	for (unsigned c = 0; c < vd->vdev_children; c++)
	dump_dtl(vd->vdev_child[c], indent + 4);
	}

	static void
	dump_history(spa_t *spa)
	{
	nvlist_t **events = NULL;
	char *buf;
	uint64_t resid, len, off = 0;
	uint_t num = 0;
	int error;
	time_t tsec;
	struct tm t;
	char tbuf[30];
	char internalstr[MAXPATHLEN];

	if ((buf = malloc(SPA_OLD_MAXBLOCKSIZE)) == NULL) {
	(void) fprintf(stderr, "%s: unable to allocate I/O buffer\n",
	__func__);
	return;
	}

	do {
	len = SPA_OLD_MAXBLOCKSIZE;

	if ((error = spa_history_get(spa, &off, &len, buf)) != 0) {
	(void) fprintf(stderr, "Unable to read history: "
	"error %d\n", error);
	free(buf);
	return;
	}

	if (zpool_history_unpack(buf, len, &resid, &events, &num) != 0)
	break;

	off -= resid;
	} while (len != 0);

	(void) printf("\nHistory:\n");
	for (unsigned i = 0; i < num; i++) {
	uint64_t time, txg, ievent;
	char cmd, intstr;
	boolean_t printed = B_FALSE;

	if (nvlist_lookup_uint64(events[i], ZPOOL_HIST_TIME,
	&time) != 0)
	goto next;
	if (nvlist_lookup_string(events[i], ZPOOL_HIST_CMD,
	&cmd) != 0) {
	if (nvlist_lookup_uint64(events[i],
	ZPOOL_HIST_INT_EVENT, &ievent) != 0)
	goto next;
	verify(nvlist_lookup_uint64(events[i],
	ZPOOL_HIST_TXG, &txg) == 0);
	verify(nvlist_lookup_string(events[i],
	ZPOOL_HIST_INT_STR, &intstr) == 0);
	if (ievent >= ZFS_NUM_LEGACY_HISTORY_EVENTS)
	goto next;

	(void) snprintf(internalstr,
	sizeof (internalstr),
	"[internal %s txg:%lld] %s",
	zfs_history_event_names[ievent],
	(longlong_t)txg, intstr);
	cmd = internalstr;
	}
	tsec = time;
	(void) localtime_r(&tsec, &t);
	(void) strftime(tbuf, sizeof (tbuf), "%F.%T", &t);
	(void) printf("%s %s\n", tbuf, cmd);
	printed = B_TRUE;

	next:
	if (dump_opt['h'] > 1) {
	if (!printed)
	(void) printf("unrecognized record:\n");
	dump_nvlist(events[i], 2);
	}
	}
	free(buf);
	}

	/ARGSUSED/
	static void
	dump_dnode(objset_t os, uint64_t object, void data, size_t size)
	{
	}

	static uint64_t
	blkid2offset(const dnode_phys_t dnp, const blkptr_t bp,
	const zbookmark_phys_t *zb)
	{
	if (dnp == NULL) {
	ASSERT(zb->zb_level < 0);
	if (zb->zb_object == 0)
	return (zb->zb_blkid);
	return (zb->zb_blkid * BP_GET_LSIZE(bp));
	}

	ASSERT(zb->zb_level >= 0);

	return ((zb->zb_blkid <<
	(zb->zb_level * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) *
	dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
	}

	static void
	snprintf_zstd_header(spa_t spa, char blkbuf, size_t buflen,
	const blkptr_t *bp)
	{
	abd_t *pabd;
	void *buf;
	zio_t *zio;
	zfs_zstdhdr_t zstd_hdr;
	int error;

	if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_ZSTD)
	return;

	if (BP_IS_HOLE(bp))
	return;

	if (BP_IS_EMBEDDED(bp)) {
	buf = malloc(SPA_MAXBLOCKSIZE);
	if (buf == NULL) {
	(void) fprintf(stderr, "out of memory\n");
	exit(1);
	}
	decode_embedded_bp_compressed(bp, buf);
	memcpy(&zstd_hdr, buf, sizeof (zstd_hdr));
	free(buf);
	zstd_hdr.c_len = BE_32(zstd_hdr.c_len);
	zstd_hdr.raw_version_level = BE_32(zstd_hdr.raw_version_level);
	(void) snprintf(blkbuf + strlen(blkbuf),
	buflen - strlen(blkbuf),
	" ZSTD:size=%u:version=%u:level=%u:EMBEDDED",
	- zstd_hdr.c_len, zstd_hdr.version, zstd_hdr.level);
	+ zstd_hdr.c_len, zfs_get_hdrversion(&zstd_hdr),
	+ zfs_get_hdrlevel(&zstd_hdr));
	return;
	}

	pabd = abd_alloc_for_io(SPA_MAXBLOCKSIZE, B_FALSE);
	zio = zio_root(spa, NULL, NULL, 0);

	/* Decrypt but don't decompress so we can read the compression header */
	zio_nowait(zio_read(zio, spa, bp, pabd, BP_GET_PSIZE(bp), NULL, NULL,
	ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL \| ZIO_FLAG_RAW_COMPRESS,
	NULL));
	error = zio_wait(zio);
	if (error) {
	(void) fprintf(stderr, "read failed: %d\n", error);
	return;
	}
	buf = abd_borrow_buf_copy(pabd, BP_GET_LSIZE(bp));
	memcpy(&zstd_hdr, buf, sizeof (zstd_hdr));
	zstd_hdr.c_len = BE_32(zstd_hdr.c_len);
	zstd_hdr.raw_version_level = BE_32(zstd_hdr.raw_version_level);

	(void) snprintf(blkbuf + strlen(blkbuf),
	buflen - strlen(blkbuf),
	" ZSTD:size=%u:version=%u:level=%u:NORMAL",
	- zstd_hdr.c_len, zstd_hdr.version, zstd_hdr.level);
	+ zstd_hdr.c_len, zfs_get_hdrversion(&zstd_hdr),
	+ zfs_get_hdrlevel(&zstd_hdr));

	abd_return_buf_copy(pabd, buf, BP_GET_LSIZE(bp));
	}

	static void
	snprintf_blkptr_compact(char blkbuf, size_t buflen, const blkptr_t bp,
	boolean_t bp_freed)
	{
	const dva_t *dva = bp->blk_dva;
	int ndvas = dump_opt['d'] > 5 ? BP_GET_NDVAS(bp) : 1;
	int i;

	if (dump_opt['b'] >= 6) {
	snprintf_blkptr(blkbuf, buflen, bp);
	if (bp_freed) {
	(void) snprintf(blkbuf + strlen(blkbuf),
	buflen - strlen(blkbuf), " %s", "FREE");
	}
	return;
	}

	if (BP_IS_EMBEDDED(bp)) {
	(void) sprintf(blkbuf,
	"EMBEDDED et=%u %llxL/%llxP B=%llu",
	(int)BPE_GET_ETYPE(bp),
	(u_longlong_t)BPE_GET_LSIZE(bp),
	(u_longlong_t)BPE_GET_PSIZE(bp),
	(u_longlong_t)bp->blk_birth);
	return;
	}

	blkbuf[0] = '\0';

	for (i = 0; i < ndvas; i++)
	(void) snprintf(blkbuf + strlen(blkbuf),
	buflen - strlen(blkbuf), "%llu:%llx:%llx ",
	(u_longlong_t)DVA_GET_VDEV(&dva[i]),
	(u_longlong_t)DVA_GET_OFFSET(&dva[i]),
	(u_longlong_t)DVA_GET_ASIZE(&dva[i]));

	if (BP_IS_HOLE(bp)) {
	(void) snprintf(blkbuf + strlen(blkbuf),
	buflen - strlen(blkbuf),
	"%llxL B=%llu",
	(u_longlong_t)BP_GET_LSIZE(bp),
	(u_longlong_t)bp->blk_birth);
	} else {
	(void) snprintf(blkbuf + strlen(blkbuf),
	buflen - strlen(blkbuf),
	"%llxL/%llxP F=%llu B=%llu/%llu",
	(u_longlong_t)BP_GET_LSIZE(bp),
	(u_longlong_t)BP_GET_PSIZE(bp),
	(u_longlong_t)BP_GET_FILL(bp),
	(u_longlong_t)bp->blk_birth,
	(u_longlong_t)BP_PHYSICAL_BIRTH(bp));
	if (bp_freed)
	(void) snprintf(blkbuf + strlen(blkbuf),
	buflen - strlen(blkbuf), " %s", "FREE");
	(void) snprintf(blkbuf + strlen(blkbuf),
	buflen - strlen(blkbuf), " cksum=%llx:%llx:%llx:%llx",
	(u_longlong_t)bp->blk_cksum.zc_word[0],
	(u_longlong_t)bp->blk_cksum.zc_word[1],
	(u_longlong_t)bp->blk_cksum.zc_word[2],
	(u_longlong_t)bp->blk_cksum.zc_word[3]);
	}
	}

	static void
	print_indirect(spa_t spa, blkptr_t bp, const zbookmark_phys_t *zb,
	const dnode_phys_t *dnp)
	{
	char blkbuf[BP_SPRINTF_LEN];
	int l;

	if (!BP_IS_EMBEDDED(bp)) {
	ASSERT3U(BP_GET_TYPE(bp), ==, dnp->dn_type);
	ASSERT3U(BP_GET_LEVEL(bp), ==, zb->zb_level);
	}

	(void) printf("%16llx ", (u_longlong_t)blkid2offset(dnp, bp, zb));

	ASSERT(zb->zb_level >= 0);

	for (l = dnp->dn_nlevels - 1; l >= -1; l--) {
	if (l == zb->zb_level) {
	(void) printf("L%llx", (u_longlong_t)zb->zb_level);
	} else {
	(void) printf(" ");
	}
	}

	snprintf_blkptr_compact(blkbuf, sizeof (blkbuf), bp, B_FALSE);
	if (dump_opt['Z'] && BP_GET_COMPRESS(bp) == ZIO_COMPRESS_ZSTD)
	snprintf_zstd_header(spa, blkbuf, sizeof (blkbuf), bp);
	(void) printf("%s\n", blkbuf);
	}

	static int
	visit_indirect(spa_t spa, const dnode_phys_t dnp,
	blkptr_t bp, const zbookmark_phys_t zb)
	{
	int err = 0;

	if (bp->blk_birth == 0)
	return (0);

	print_indirect(spa, bp, zb, dnp);

	if (BP_GET_LEVEL(bp) > 0 && !BP_IS_HOLE(bp)) {
	arc_flags_t flags = ARC_FLAG_WAIT;
	int i;
	blkptr_t *cbp;
	int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
	arc_buf_t *buf;
	uint64_t fill = 0;
	ASSERT(!BP_IS_REDACTED(bp));

	err = arc_read(NULL, spa, bp, arc_getbuf_func, &buf,
	ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
	if (err)
	return (err);
	ASSERT(buf->b_data);

	/* recursively visit blocks below this */
	cbp = buf->b_data;
	for (i = 0; i < epb; i++, cbp++) {
	zbookmark_phys_t czb;

	SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
	zb->zb_level - 1,
	zb->zb_blkid * epb + i);
	err = visit_indirect(spa, dnp, cbp, &czb);
	if (err)
	break;
	fill += BP_GET_FILL(cbp);
	}
	if (!err)
	ASSERT3U(fill, ==, BP_GET_FILL(bp));
	arc_buf_destroy(buf, &buf);
	}

	return (err);
	}

	/ARGSUSED/
	static void
	dump_indirect(dnode_t *dn)
	{
	dnode_phys_t *dnp = dn->dn_phys;
	int j;
	zbookmark_phys_t czb;

	(void) printf("Indirect blocks:\n");

	SET_BOOKMARK(&czb, dmu_objset_id(dn->dn_objset),
	dn->dn_object, dnp->dn_nlevels - 1, 0);
	for (j = 0; j < dnp->dn_nblkptr; j++) {
	czb.zb_blkid = j;
	(void) visit_indirect(dmu_objset_spa(dn->dn_objset), dnp,
	&dnp->dn_blkptr[j], &czb);
	}

	(void) printf("\n");
	}

	/ARGSUSED/
	static void
	dump_dsl_dir(objset_t os, uint64_t object, void data, size_t size)
	{
	dsl_dir_phys_t *dd = data;
	time_t crtime;
	char nice[32];

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (nice) >= NN_NUMBUF_SZ);

	if (dd == NULL)
	return;

	ASSERT3U(size, >=, sizeof (dsl_dir_phys_t));

	crtime = dd->dd_creation_time;
	(void) printf("\t\tcreation_time = %s", ctime(&crtime));
	(void) printf("\t\thead_dataset_obj = %llu\n",
	(u_longlong_t)dd->dd_head_dataset_obj);
	(void) printf("\t\tparent_dir_obj = %llu\n",
	(u_longlong_t)dd->dd_parent_obj);
	(void) printf("\t\torigin_obj = %llu\n",
	(u_longlong_t)dd->dd_origin_obj);
	(void) printf("\t\tchild_dir_zapobj = %llu\n",
	(u_longlong_t)dd->dd_child_dir_zapobj);
	zdb_nicenum(dd->dd_used_bytes, nice, sizeof (nice));
	(void) printf("\t\tused_bytes = %s\n", nice);
	zdb_nicenum(dd->dd_compressed_bytes, nice, sizeof (nice));
	(void) printf("\t\tcompressed_bytes = %s\n", nice);
	zdb_nicenum(dd->dd_uncompressed_bytes, nice, sizeof (nice));
	(void) printf("\t\tuncompressed_bytes = %s\n", nice);
	zdb_nicenum(dd->dd_quota, nice, sizeof (nice));
	(void) printf("\t\tquota = %s\n", nice);
	zdb_nicenum(dd->dd_reserved, nice, sizeof (nice));
	(void) printf("\t\treserved = %s\n", nice);
	(void) printf("\t\tprops_zapobj = %llu\n",
	(u_longlong_t)dd->dd_props_zapobj);
	(void) printf("\t\tdeleg_zapobj = %llu\n",
	(u_longlong_t)dd->dd_deleg_zapobj);
	(void) printf("\t\tflags = %llx\n",
	(u_longlong_t)dd->dd_flags);

	#define DO(which) \
	zdb_nicenum(dd->dd_used_breakdown[DD_USED_ ## which], nice, \
	sizeof (nice)); \
	(void) printf("\t\tused_breakdown[" #which "] = %s\n", nice)
	DO(HEAD);
	DO(SNAP);
	DO(CHILD);
	DO(CHILD_RSRV);
	DO(REFRSRV);
	#undef DO
	(void) printf("\t\tclones = %llu\n",
	(u_longlong_t)dd->dd_clones);
	}

	/ARGSUSED/
	static void
	dump_dsl_dataset(objset_t os, uint64_t object, void data, size_t size)
	{
	dsl_dataset_phys_t *ds = data;
	time_t crtime;
	char used[32], compressed[32], uncompressed[32], unique[32];
	char blkbuf[BP_SPRINTF_LEN];

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (used) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (compressed) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (uncompressed) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (unique) >= NN_NUMBUF_SZ);

	if (ds == NULL)
	return;

	ASSERT(size == sizeof (*ds));
	crtime = ds->ds_creation_time;
	zdb_nicenum(ds->ds_referenced_bytes, used, sizeof (used));
	zdb_nicenum(ds->ds_compressed_bytes, compressed, sizeof (compressed));
	zdb_nicenum(ds->ds_uncompressed_bytes, uncompressed,
	sizeof (uncompressed));
	zdb_nicenum(ds->ds_unique_bytes, unique, sizeof (unique));
	snprintf_blkptr(blkbuf, sizeof (blkbuf), &ds->ds_bp);

	(void) printf("\t\tdir_obj = %llu\n",
	(u_longlong_t)ds->ds_dir_obj);
	(void) printf("\t\tprev_snap_obj = %llu\n",
	(u_longlong_t)ds->ds_prev_snap_obj);
	(void) printf("\t\tprev_snap_txg = %llu\n",
	(u_longlong_t)ds->ds_prev_snap_txg);
	(void) printf("\t\tnext_snap_obj = %llu\n",
	(u_longlong_t)ds->ds_next_snap_obj);
	(void) printf("\t\tsnapnames_zapobj = %llu\n",
	(u_longlong_t)ds->ds_snapnames_zapobj);
	(void) printf("\t\tnum_children = %llu\n",
	(u_longlong_t)ds->ds_num_children);
	(void) printf("\t\tuserrefs_obj = %llu\n",
	(u_longlong_t)ds->ds_userrefs_obj);
	(void) printf("\t\tcreation_time = %s", ctime(&crtime));
	(void) printf("\t\tcreation_txg = %llu\n",
	(u_longlong_t)ds->ds_creation_txg);
	(void) printf("\t\tdeadlist_obj = %llu\n",
	(u_longlong_t)ds->ds_deadlist_obj);
	(void) printf("\t\tused_bytes = %s\n", used);
	(void) printf("\t\tcompressed_bytes = %s\n", compressed);
	(void) printf("\t\tuncompressed_bytes = %s\n", uncompressed);
	(void) printf("\t\tunique = %s\n", unique);
	(void) printf("\t\tfsid_guid = %llu\n",
	(u_longlong_t)ds->ds_fsid_guid);
	(void) printf("\t\tguid = %llu\n",
	(u_longlong_t)ds->ds_guid);
	(void) printf("\t\tflags = %llx\n",
	(u_longlong_t)ds->ds_flags);
	(void) printf("\t\tnext_clones_obj = %llu\n",
	(u_longlong_t)ds->ds_next_clones_obj);
	(void) printf("\t\tprops_obj = %llu\n",
	(u_longlong_t)ds->ds_props_obj);
	(void) printf("\t\tbp = %s\n", blkbuf);
	}

	/* ARGSUSED */
	static int
	dump_bptree_cb(void arg, const blkptr_t bp, dmu_tx_t *tx)
	{
	char blkbuf[BP_SPRINTF_LEN];

	if (bp->blk_birth != 0) {
	snprintf_blkptr(blkbuf, sizeof (blkbuf), bp);
	(void) printf("\t%s\n", blkbuf);
	}
	return (0);
	}

	static void
	dump_bptree(objset_t os, uint64_t obj, const char name)
	{
	char bytes[32];
	bptree_phys_t *bt;
	dmu_buf_t *db;

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (bytes) >= NN_NUMBUF_SZ);

	if (dump_opt['d'] < 3)
	return;

	VERIFY3U(0, ==, dmu_bonus_hold(os, obj, FTAG, &db));
	bt = db->db_data;
	zdb_nicenum(bt->bt_bytes, bytes, sizeof (bytes));
	(void) printf("\n %s: %llu datasets, %s\n",
	name, (unsigned long long)(bt->bt_end - bt->bt_begin), bytes);
	dmu_buf_rele(db, FTAG);

	if (dump_opt['d'] < 5)
	return;

	(void) printf("\n");

	(void) bptree_iterate(os, obj, B_FALSE, dump_bptree_cb, NULL, NULL);
	}

	/* ARGSUSED */
	static int
	dump_bpobj_cb(void arg, const blkptr_t bp, boolean_t bp_freed, dmu_tx_t *tx)
	{
	char blkbuf[BP_SPRINTF_LEN];

	ASSERT(bp->blk_birth != 0);
	snprintf_blkptr_compact(blkbuf, sizeof (blkbuf), bp, bp_freed);
	(void) printf("\t%s\n", blkbuf);
	return (0);
	}

	static void
	dump_full_bpobj(bpobj_t bpo, const char name, int indent)
	{
	char bytes[32];
	char comp[32];
	char uncomp[32];
	uint64_t i;

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (bytes) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (comp) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (uncomp) >= NN_NUMBUF_SZ);

	if (dump_opt['d'] < 3)
	return;

	zdb_nicenum(bpo->bpo_phys->bpo_bytes, bytes, sizeof (bytes));
	if (bpo->bpo_havesubobj && bpo->bpo_phys->bpo_subobjs != 0) {
	zdb_nicenum(bpo->bpo_phys->bpo_comp, comp, sizeof (comp));
	zdb_nicenum(bpo->bpo_phys->bpo_uncomp, uncomp, sizeof (uncomp));
	if (bpo->bpo_havefreed) {
	(void) printf(" %*s: object %llu, %llu local "
	"blkptrs, %llu freed, %llu subobjs in object %llu, "
	"%s (%s/%s comp)\n",
	indent * 8, name,
	(u_longlong_t)bpo->bpo_object,
	(u_longlong_t)bpo->bpo_phys->bpo_num_blkptrs,
	(u_longlong_t)bpo->bpo_phys->bpo_num_freed,
	(u_longlong_t)bpo->bpo_phys->bpo_num_subobjs,
	(u_longlong_t)bpo->bpo_phys->bpo_subobjs,
	bytes, comp, uncomp);
	} else {
	(void) printf(" %*s: object %llu, %llu local "
	"blkptrs, %llu subobjs in object %llu, "
	"%s (%s/%s comp)\n",
	indent * 8, name,
	(u_longlong_t)bpo->bpo_object,
	(u_longlong_t)bpo->bpo_phys->bpo_num_blkptrs,
	(u_longlong_t)bpo->bpo_phys->bpo_num_subobjs,
	(u_longlong_t)bpo->bpo_phys->bpo_subobjs,
	bytes, comp, uncomp);
	}

	for (i = 0; i < bpo->bpo_phys->bpo_num_subobjs; i++) {
	uint64_t subobj;
	bpobj_t subbpo;
	int error;
	VERIFY0(dmu_read(bpo->bpo_os,
	bpo->bpo_phys->bpo_subobjs,
	i * sizeof (subobj), sizeof (subobj), &subobj, 0));
	error = bpobj_open(&subbpo, bpo->bpo_os, subobj);
	if (error != 0) {
	(void) printf("ERROR %u while trying to open "
	"subobj id %llu\n",
	error, (u_longlong_t)subobj);
	continue;
	}
	dump_full_bpobj(&subbpo, "subobj", indent + 1);
	bpobj_close(&subbpo);
	}
	} else {
	if (bpo->bpo_havefreed) {
	(void) printf(" %*s: object %llu, %llu blkptrs, "
	"%llu freed, %s\n",
	indent * 8, name,
	(u_longlong_t)bpo->bpo_object,
	(u_longlong_t)bpo->bpo_phys->bpo_num_blkptrs,
	(u_longlong_t)bpo->bpo_phys->bpo_num_freed,
	bytes);
	} else {
	(void) printf(" %*s: object %llu, %llu blkptrs, "
	"%s\n",
	indent * 8, name,
	(u_longlong_t)bpo->bpo_object,
	(u_longlong_t)bpo->bpo_phys->bpo_num_blkptrs,
	bytes);
	}
	}

	if (dump_opt['d'] < 5)
	return;


	if (indent == 0) {
	(void) bpobj_iterate_nofree(bpo, dump_bpobj_cb, NULL, NULL);
	(void) printf("\n");
	}
	}

	static int
	dump_bookmark(dsl_pool_t dp, char name, boolean_t print_redact,
	boolean_t print_list)
	{
	int err = 0;
	zfs_bookmark_phys_t prop;
	objset_t *mos = dp->dp_spa->spa_meta_objset;
	err = dsl_bookmark_lookup(dp, name, NULL, &prop);

	if (err != 0) {
	return (err);
	}

	(void) printf("\t#%s: ", strchr(name, '#') + 1);
	(void) printf("{guid: %llx creation_txg: %llu creation_time: "
	"%llu redaction_obj: %llu}\n", (u_longlong_t)prop.zbm_guid,
	(u_longlong_t)prop.zbm_creation_txg,
	(u_longlong_t)prop.zbm_creation_time,
	(u_longlong_t)prop.zbm_redaction_obj);

	IMPLY(print_list, print_redact);
	if (!print_redact \|\| prop.zbm_redaction_obj == 0)
	return (0);

	redaction_list_t *rl;
	VERIFY0(dsl_redaction_list_hold_obj(dp,
	prop.zbm_redaction_obj, FTAG, &rl));

	redaction_list_phys_t *rlp = rl->rl_phys;
	(void) printf("\tRedacted:\n\t\tProgress: ");
	if (rlp->rlp_last_object != UINT64_MAX \|\|
	rlp->rlp_last_blkid != UINT64_MAX) {
	(void) printf("%llu %llu (incomplete)\n",
	(u_longlong_t)rlp->rlp_last_object,
	(u_longlong_t)rlp->rlp_last_blkid);
	} else {
	(void) printf("complete\n");
	}
	(void) printf("\t\tSnapshots: [");
	for (unsigned int i = 0; i < rlp->rlp_num_snaps; i++) {
	if (i > 0)
	(void) printf(", ");
	(void) printf("%0llu",
	(u_longlong_t)rlp->rlp_snaps[i]);
	}
	(void) printf("]\n\t\tLength: %llu\n",
	(u_longlong_t)rlp->rlp_num_entries);

	if (!print_list) {
	dsl_redaction_list_rele(rl, FTAG);
	return (0);
	}

	if (rlp->rlp_num_entries == 0) {
	dsl_redaction_list_rele(rl, FTAG);
	(void) printf("\t\tRedaction List: []\n\n");
	return (0);
	}

	redact_block_phys_t *rbp_buf;
	uint64_t size;
	dmu_object_info_t doi;

	VERIFY0(dmu_object_info(mos, prop.zbm_redaction_obj, &doi));
	size = doi.doi_max_offset;
	rbp_buf = kmem_alloc(size, KM_SLEEP);

	err = dmu_read(mos, prop.zbm_redaction_obj, 0, size,
	rbp_buf, 0);
	if (err != 0) {
	dsl_redaction_list_rele(rl, FTAG);
	kmem_free(rbp_buf, size);
	return (err);
	}

	(void) printf("\t\tRedaction List: [{object: %llx, offset: "
	"%llx, blksz: %x, count: %llx}",
	(u_longlong_t)rbp_buf[0].rbp_object,
	(u_longlong_t)rbp_buf[0].rbp_blkid,
	(uint_t)(redact_block_get_size(&rbp_buf[0])),
	(u_longlong_t)redact_block_get_count(&rbp_buf[0]));

	for (size_t i = 1; i < rlp->rlp_num_entries; i++) {
	(void) printf(",\n\t\t{object: %llx, offset: %llx, "
	"blksz: %x, count: %llx}",
	(u_longlong_t)rbp_buf[i].rbp_object,
	(u_longlong_t)rbp_buf[i].rbp_blkid,
	(uint_t)(redact_block_get_size(&rbp_buf[i])),
	(u_longlong_t)redact_block_get_count(&rbp_buf[i]));
	}
	dsl_redaction_list_rele(rl, FTAG);
	kmem_free(rbp_buf, size);
	(void) printf("]\n\n");
	return (0);
	}

	static void
	dump_bookmarks(objset_t *os, int verbosity)
	{
	zap_cursor_t zc;
	zap_attribute_t attr;
	dsl_dataset_t *ds = dmu_objset_ds(os);
	dsl_pool_t *dp = spa_get_dsl(os->os_spa);
	objset_t *mos = os->os_spa->spa_meta_objset;
	if (verbosity < 4)
	return;
	dsl_pool_config_enter(dp, FTAG);

	for (zap_cursor_init(&zc, mos, ds->ds_bookmarks_obj);
	zap_cursor_retrieve(&zc, &attr) == 0;
	zap_cursor_advance(&zc)) {
	char osname[ZFS_MAX_DATASET_NAME_LEN];
	char buf[ZFS_MAX_DATASET_NAME_LEN];
	dmu_objset_name(os, osname);
	VERIFY3S(0, <=, snprintf(buf, sizeof (buf), "%s#%s", osname,
	attr.za_name));
	(void) dump_bookmark(dp, buf, verbosity >= 5, verbosity >= 6);
	}
	zap_cursor_fini(&zc);
	dsl_pool_config_exit(dp, FTAG);
	}

	static void
	bpobj_count_refd(bpobj_t *bpo)
	{
	mos_obj_refd(bpo->bpo_object);

	if (bpo->bpo_havesubobj && bpo->bpo_phys->bpo_subobjs != 0) {
	mos_obj_refd(bpo->bpo_phys->bpo_subobjs);
	for (uint64_t i = 0; i < bpo->bpo_phys->bpo_num_subobjs; i++) {
	uint64_t subobj;
	bpobj_t subbpo;
	int error;
	VERIFY0(dmu_read(bpo->bpo_os,
	bpo->bpo_phys->bpo_subobjs,
	i * sizeof (subobj), sizeof (subobj), &subobj, 0));
	error = bpobj_open(&subbpo, bpo->bpo_os, subobj);
	if (error != 0) {
	(void) printf("ERROR %u while trying to open "
	"subobj id %llu\n",
	error, (u_longlong_t)subobj);
	continue;
	}
	bpobj_count_refd(&subbpo);
	bpobj_close(&subbpo);
	}
	}
	}

	static int
	dsl_deadlist_entry_count_refd(void arg, dsl_deadlist_entry_t dle)
	{
	spa_t *spa = arg;
	uint64_t empty_bpobj = spa->spa_dsl_pool->dp_empty_bpobj;
	if (dle->dle_bpobj.bpo_object != empty_bpobj)
	bpobj_count_refd(&dle->dle_bpobj);
	return (0);
	}

	static int
	dsl_deadlist_entry_dump(void arg, dsl_deadlist_entry_t dle)
	{
	ASSERT(arg == NULL);
	if (dump_opt['d'] >= 5) {
	char buf[128];
	(void) snprintf(buf, sizeof (buf),
	"mintxg %llu -> obj %llu",
	(longlong_t)dle->dle_mintxg,
	(longlong_t)dle->dle_bpobj.bpo_object);

	dump_full_bpobj(&dle->dle_bpobj, buf, 0);
	} else {
	(void) printf("mintxg %llu -> obj %llu\n",
	(longlong_t)dle->dle_mintxg,
	(longlong_t)dle->dle_bpobj.bpo_object);
	}
	return (0);
	}

	static void
	dump_blkptr_list(dsl_deadlist_t dl, char name)
	{
	char bytes[32];
	char comp[32];
	char uncomp[32];
	char entries[32];
	spa_t *spa = dmu_objset_spa(dl->dl_os);
	uint64_t empty_bpobj = spa->spa_dsl_pool->dp_empty_bpobj;

	if (dl->dl_oldfmt) {
	if (dl->dl_bpobj.bpo_object != empty_bpobj)
	bpobj_count_refd(&dl->dl_bpobj);
	} else {
	mos_obj_refd(dl->dl_object);
	dsl_deadlist_iterate(dl, dsl_deadlist_entry_count_refd, spa);
	}

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (bytes) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (comp) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (uncomp) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (entries) >= NN_NUMBUF_SZ);

	if (dump_opt['d'] < 3)
	return;

	if (dl->dl_oldfmt) {
	dump_full_bpobj(&dl->dl_bpobj, "old-format deadlist", 0);
	return;
	}

	zdb_nicenum(dl->dl_phys->dl_used, bytes, sizeof (bytes));
	zdb_nicenum(dl->dl_phys->dl_comp, comp, sizeof (comp));
	zdb_nicenum(dl->dl_phys->dl_uncomp, uncomp, sizeof (uncomp));
	zdb_nicenum(avl_numnodes(&dl->dl_tree), entries, sizeof (entries));
	(void) printf("\n %s: %s (%s/%s comp), %s entries\n",
	name, bytes, comp, uncomp, entries);

	if (dump_opt['d'] < 4)
	return;

	(void) printf("\n");

	dsl_deadlist_iterate(dl, dsl_deadlist_entry_dump, NULL);
	}

	static int
	verify_dd_livelist(objset_t *os)
	{
	uint64_t ll_used, used, ll_comp, comp, ll_uncomp, uncomp;
	dsl_pool_t *dp = spa_get_dsl(os->os_spa);
	dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;

	ASSERT(!dmu_objset_is_snapshot(os));
	if (!dsl_deadlist_is_open(&dd->dd_livelist))
	return (0);

	/* Iterate through the livelist to check for duplicates */
	dsl_deadlist_iterate(&dd->dd_livelist, sublivelist_verify_lightweight,
	NULL);

	dsl_pool_config_enter(dp, FTAG);
	dsl_deadlist_space(&dd->dd_livelist, &ll_used,
	&ll_comp, &ll_uncomp);

	dsl_dataset_t *origin_ds;
	ASSERT(dsl_pool_config_held(dp));
	VERIFY0(dsl_dataset_hold_obj(dp,
	dsl_dir_phys(dd)->dd_origin_obj, FTAG, &origin_ds));
	VERIFY0(dsl_dataset_space_written(origin_ds, os->os_dsl_dataset,
	&used, &comp, &uncomp));
	dsl_dataset_rele(origin_ds, FTAG);
	dsl_pool_config_exit(dp, FTAG);
	/*
	* It's possible that the dataset's uncomp space is larger than the
	* livelist's because livelists do not track embedded block pointers
	*/
	if (used != ll_used \|\| comp != ll_comp \|\| uncomp < ll_uncomp) {
	char nice_used[32], nice_comp[32], nice_uncomp[32];
	(void) printf("Discrepancy in space accounting:\n");
	zdb_nicenum(used, nice_used, sizeof (nice_used));
	zdb_nicenum(comp, nice_comp, sizeof (nice_comp));
	zdb_nicenum(uncomp, nice_uncomp, sizeof (nice_uncomp));
	(void) printf("dir: used %s, comp %s, uncomp %s\n",
	nice_used, nice_comp, nice_uncomp);
	zdb_nicenum(ll_used, nice_used, sizeof (nice_used));
	zdb_nicenum(ll_comp, nice_comp, sizeof (nice_comp));
	zdb_nicenum(ll_uncomp, nice_uncomp, sizeof (nice_uncomp));
	(void) printf("livelist: used %s, comp %s, uncomp %s\n",
	nice_used, nice_comp, nice_uncomp);
	return (1);
	}
	return (0);
	}

	static avl_tree_t idx_tree;
	static avl_tree_t domain_tree;
	static boolean_t fuid_table_loaded;
	static objset_t *sa_os = NULL;
	static sa_attr_type_t *sa_attr_table = NULL;

	static int
	open_objset(const char path, void tag, objset_t **osp)
	{
	int err;
	uint64_t sa_attrs = 0;
	uint64_t version = 0;

	VERIFY3P(sa_os, ==, NULL);
	/*
	* We can't own an objset if it's redacted. Therefore, we do this
	* dance: hold the objset, then acquire a long hold on its dataset, then
	* release the pool (which is held as part of holding the objset).
	*/
	err = dmu_objset_hold(path, tag, osp);
	if (err != 0) {
	(void) fprintf(stderr, "failed to hold dataset '%s': %s\n",
	path, strerror(err));
	return (err);
	}
	dsl_dataset_long_hold(dmu_objset_ds(*osp), tag);
	dsl_pool_rele(dmu_objset_pool(*osp), tag);

	if (dmu_objset_type(osp) == DMU_OST_ZFS && !(osp)->os_encrypted) {
	(void) zap_lookup(*osp, MASTER_NODE_OBJ, ZPL_VERSION_STR,
	8, 1, &version);
	if (version >= ZPL_VERSION_SA) {
	(void) zap_lookup(*osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS,
	8, 1, &sa_attrs);
	}
	err = sa_setup(*osp, sa_attrs, zfs_attr_table, ZPL_END,
	&sa_attr_table);
	if (err != 0) {
	(void) fprintf(stderr, "sa_setup failed: %s\n",
	strerror(err));
	dsl_dataset_long_rele(dmu_objset_ds(*osp), tag);
	dsl_dataset_rele(dmu_objset_ds(*osp), tag);
	*osp = NULL;
	}
	}
	sa_os = *osp;

	return (0);
	}

	static void
	close_objset(objset_t os, void tag)
	{
	VERIFY3P(os, ==, sa_os);
	if (os->os_sa != NULL)
	sa_tear_down(os);
	dsl_dataset_long_rele(dmu_objset_ds(os), tag);
	dsl_dataset_rele(dmu_objset_ds(os), tag);
	sa_attr_table = NULL;
	sa_os = NULL;
	}

	static void
	fuid_table_destroy(void)
	{
	if (fuid_table_loaded) {
	zfs_fuid_table_destroy(&idx_tree, &domain_tree);
	fuid_table_loaded = B_FALSE;
	}
	}

	/*
	* print uid or gid information.
	* For normal POSIX id just the id is printed in decimal format.
	* For CIFS files with FUID the fuid is printed in hex followed by
	* the domain-rid string.
	*/
	static void
	print_idstr(uint64_t id, const char *id_type)
	{
	if (FUID_INDEX(id)) {
	char *domain;

	domain = zfs_fuid_idx_domain(&idx_tree, FUID_INDEX(id));
	(void) printf("\t%s %llx [%s-%d]\n", id_type,
	(u_longlong_t)id, domain, (int)FUID_RID(id));
	} else {
	(void) printf("\t%s %llu\n", id_type, (u_longlong_t)id);
	}

	}

	static void
	dump_uidgid(objset_t *os, uint64_t uid, uint64_t gid)
	{
	uint32_t uid_idx, gid_idx;

	uid_idx = FUID_INDEX(uid);
	gid_idx = FUID_INDEX(gid);

	/* Load domain table, if not already loaded */
	if (!fuid_table_loaded && (uid_idx \|\| gid_idx)) {
	uint64_t fuid_obj;

	/* first find the fuid object. It lives in the master node */
	VERIFY(zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES,
	8, 1, &fuid_obj) == 0);
	zfs_fuid_avl_tree_create(&idx_tree, &domain_tree);
	(void) zfs_fuid_table_load(os, fuid_obj,
	&idx_tree, &domain_tree);
	fuid_table_loaded = B_TRUE;
	}

	print_idstr(uid, "uid");
	print_idstr(gid, "gid");
	}

	static void
	dump_znode_sa_xattr(sa_handle_t *hdl)
	{
	nvlist_t *sa_xattr;
	nvpair_t *elem = NULL;
	int sa_xattr_size = 0;
	int sa_xattr_entries = 0;
	int error;
	char *sa_xattr_packed;

	error = sa_size(hdl, sa_attr_table[ZPL_DXATTR], &sa_xattr_size);
	if (error \|\| sa_xattr_size == 0)
	return;

	sa_xattr_packed = malloc(sa_xattr_size);
	if (sa_xattr_packed == NULL)
	return;

	error = sa_lookup(hdl, sa_attr_table[ZPL_DXATTR],
	sa_xattr_packed, sa_xattr_size);
	if (error) {
	free(sa_xattr_packed);
	return;
	}

	error = nvlist_unpack(sa_xattr_packed, sa_xattr_size, &sa_xattr, 0);
	if (error) {
	free(sa_xattr_packed);
	return;
	}

	while ((elem = nvlist_next_nvpair(sa_xattr, elem)) != NULL)
	sa_xattr_entries++;

	(void) printf("\tSA xattrs: %d bytes, %d entries\n\n",
	sa_xattr_size, sa_xattr_entries);
	while ((elem = nvlist_next_nvpair(sa_xattr, elem)) != NULL) {
	uchar_t *value;
	uint_t cnt, idx;

	(void) printf("\t\t%s = ", nvpair_name(elem));
	nvpair_value_byte_array(elem, &value, &cnt);
	for (idx = 0; idx < cnt; ++idx) {
	if (isprint(value[idx]))
	(void) putchar(value[idx]);
	else
	(void) printf("\\%3.3o", value[idx]);
	}
	(void) putchar('\n');
	}

	nvlist_free(sa_xattr);
	free(sa_xattr_packed);
	}

	static void
	dump_znode_symlink(sa_handle_t *hdl)
	{
	int sa_symlink_size = 0;
	char linktarget[MAXPATHLEN];
	linktarget[0] = '\0';
	int error;

	error = sa_size(hdl, sa_attr_table[ZPL_SYMLINK], &sa_symlink_size);
	if (error \|\| sa_symlink_size == 0) {
	return;
	}
	if (sa_lookup(hdl, sa_attr_table[ZPL_SYMLINK],
	&linktarget, sa_symlink_size) == 0)
	(void) printf("\ttarget %s\n", linktarget);
	}

	/ARGSUSED/
	static void
	dump_znode(objset_t os, uint64_t object, void data, size_t size)
	{
	char path[MAXPATHLEN * 2]; /* allow for xattr and failure prefix */
	sa_handle_t *hdl;
	uint64_t xattr, rdev, gen;
	uint64_t uid, gid, mode, fsize, parent, links;
	uint64_t pflags;
	uint64_t acctm[2], modtm[2], chgtm[2], crtm[2];
	time_t z_crtime, z_atime, z_mtime, z_ctime;
	sa_bulk_attr_t bulk[12];
	int idx = 0;
	int error;

	VERIFY3P(os, ==, sa_os);
	if (sa_handle_get(os, object, NULL, SA_HDL_PRIVATE, &hdl)) {
	(void) printf("Failed to get handle for SA znode\n");
	return;
	}

	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_UID], NULL, &uid, 8);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_GID], NULL, &gid, 8);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_LINKS], NULL,
	&links, 8);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_GEN], NULL, &gen, 8);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_MODE], NULL,
	&mode, 8);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_PARENT],
	NULL, &parent, 8);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_SIZE], NULL,
	&fsize, 8);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_ATIME], NULL,
	acctm, 16);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_MTIME], NULL,
	modtm, 16);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_CRTIME], NULL,
	crtm, 16);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_CTIME], NULL,
	chgtm, 16);
	SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_FLAGS], NULL,
	&pflags, 8);

	if (sa_bulk_lookup(hdl, bulk, idx)) {
	(void) sa_handle_destroy(hdl);
	return;
	}

	z_crtime = (time_t)crtm[0];
	z_atime = (time_t)acctm[0];
	z_mtime = (time_t)modtm[0];
	z_ctime = (time_t)chgtm[0];

	if (dump_opt['d'] > 4) {
	error = zfs_obj_to_path(os, object, path, sizeof (path));
	if (error == ESTALE) {
	(void) snprintf(path, sizeof (path), "on delete queue");
	} else if (error != 0) {
	leaked_objects++;
	(void) snprintf(path, sizeof (path),
	"path not found, possibly leaked");
	}
	(void) printf("\tpath %s\n", path);
	}

	if (S_ISLNK(mode))
	dump_znode_symlink(hdl);
	dump_uidgid(os, uid, gid);
	(void) printf("\tatime %s", ctime(&z_atime));
	(void) printf("\tmtime %s", ctime(&z_mtime));
	(void) printf("\tctime %s", ctime(&z_ctime));
	(void) printf("\tcrtime %s", ctime(&z_crtime));
	(void) printf("\tgen %llu\n", (u_longlong_t)gen);
	(void) printf("\tmode %llo\n", (u_longlong_t)mode);
	(void) printf("\tsize %llu\n", (u_longlong_t)fsize);
	(void) printf("\tparent %llu\n", (u_longlong_t)parent);
	(void) printf("\tlinks %llu\n", (u_longlong_t)links);
	(void) printf("\tpflags %llx\n", (u_longlong_t)pflags);
	if (dmu_objset_projectquota_enabled(os) && (pflags & ZFS_PROJID)) {
	uint64_t projid;

	if (sa_lookup(hdl, sa_attr_table[ZPL_PROJID], &projid,
	sizeof (uint64_t)) == 0)
	(void) printf("\tprojid %llu\n", (u_longlong_t)projid);
	}
	if (sa_lookup(hdl, sa_attr_table[ZPL_XATTR], &xattr,
	sizeof (uint64_t)) == 0)
	(void) printf("\txattr %llu\n", (u_longlong_t)xattr);
	if (sa_lookup(hdl, sa_attr_table[ZPL_RDEV], &rdev,
	sizeof (uint64_t)) == 0)
	(void) printf("\trdev 0x%016llx\n", (u_longlong_t)rdev);
	dump_znode_sa_xattr(hdl);
	sa_handle_destroy(hdl);
	}

	/ARGSUSED/
	static void
	dump_acl(objset_t os, uint64_t object, void data, size_t size)
	{
	}

	/ARGSUSED/
	static void
	dump_dmu_objset(objset_t os, uint64_t object, void data, size_t size)
	{
	}

	static object_viewer_t *object_viewer[DMU_OT_NUMTYPES + 1] = {
	dump_none, /* unallocated */
	dump_zap, /* object directory */
	dump_uint64, /* object array */
	dump_none, /* packed nvlist */
	dump_packed_nvlist, /* packed nvlist size */
	dump_none, /* bpobj */
	dump_bpobj, /* bpobj header */
	dump_none, /* SPA space map header */
	dump_none, /* SPA space map */
	dump_none, /* ZIL intent log */
	dump_dnode, /* DMU dnode */
	dump_dmu_objset, /* DMU objset */
	dump_dsl_dir, /* DSL directory */
	dump_zap, /* DSL directory child map */
	dump_zap, /* DSL dataset snap map */
	dump_zap, /* DSL props */
	dump_dsl_dataset, /* DSL dataset */
	dump_znode, /* ZFS znode */
	dump_acl, /* ZFS V0 ACL */
	dump_uint8, /* ZFS plain file */
	dump_zpldir, /* ZFS directory */
	dump_zap, /* ZFS master node */
	dump_zap, /* ZFS delete queue */
	dump_uint8, /* zvol object */
	dump_zap, /* zvol prop */
	dump_uint8, /* other uint8[] */
	dump_uint64, /* other uint64[] */
	dump_zap, /* other ZAP */
	dump_zap, /* persistent error log */
	dump_uint8, /* SPA history */
	dump_history_offsets, /* SPA history offsets */
	dump_zap, /* Pool properties */
	dump_zap, /* DSL permissions */
	dump_acl, /* ZFS ACL */
	dump_uint8, /* ZFS SYSACL */
	dump_none, /* FUID nvlist */
	dump_packed_nvlist, /* FUID nvlist size */
	dump_zap, /* DSL dataset next clones */
	dump_zap, /* DSL scrub queue */
	dump_zap, /* ZFS user/group/project used */
	dump_zap, /* ZFS user/group/project quota */
	dump_zap, /* snapshot refcount tags */
	dump_ddt_zap, /* DDT ZAP object */
	dump_zap, /* DDT statistics */
	dump_znode, /* SA object */
	dump_zap, /* SA Master Node */
	dump_sa_attrs, /* SA attribute registration */
	dump_sa_layouts, /* SA attribute layouts */
	dump_zap, /* DSL scrub translations */
	dump_none, /* fake dedup BP */
	dump_zap, /* deadlist */
	dump_none, /* deadlist hdr */
	dump_zap, /* dsl clones */
	dump_bpobj_subobjs, /* bpobj subobjs */
	dump_unknown, /* Unknown type, must be last */
	};

	static boolean_t
	match_object_type(dmu_object_type_t obj_type, uint64_t flags)
	{
	boolean_t match = B_TRUE;

	switch (obj_type) {
	case DMU_OT_DIRECTORY_CONTENTS:
	if (!(flags & ZOR_FLAG_DIRECTORY))
	match = B_FALSE;
	break;
	case DMU_OT_PLAIN_FILE_CONTENTS:
	if (!(flags & ZOR_FLAG_PLAIN_FILE))
	match = B_FALSE;
	break;
	case DMU_OT_SPACE_MAP:
	if (!(flags & ZOR_FLAG_SPACE_MAP))
	match = B_FALSE;
	break;
	default:
	if (strcmp(zdb_ot_name(obj_type), "zap") == 0) {
	if (!(flags & ZOR_FLAG_ZAP))
	match = B_FALSE;
	break;
	}

	/*
	* If all bits except some of the supported flags are
	* set, the user combined the all-types flag (A) with
	* a negated flag to exclude some types (e.g. A-f to
	* show all object types except plain files).
	*/
	if ((flags \| ZOR_SUPPORTED_FLAGS) != ZOR_FLAG_ALL_TYPES)
	match = B_FALSE;

	break;
	}

	return (match);
	}

	static void
	dump_object(objset_t *os, uint64_t object, int verbosity,
	boolean_t print_header, uint64_t dnode_slots_used, uint64_t flags)
	{
	dmu_buf_t *db = NULL;
	dmu_object_info_t doi;
	dnode_t *dn;
	boolean_t dnode_held = B_FALSE;
	void *bonus = NULL;
	size_t bsize = 0;
	char iblk[32], dblk[32], lsize[32], asize[32], fill[32], dnsize[32];
	char bonus_size[32];
	char aux[50];
	int error;

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (iblk) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (dblk) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (lsize) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (asize) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (bonus_size) >= NN_NUMBUF_SZ);

	if (*print_header) {
	(void) printf("\n%10s %3s %5s %5s %5s %6s %5s %6s %s\n",
	"Object", "lvl", "iblk", "dblk", "dsize", "dnsize",
	"lsize", "%full", "type");
	*print_header = 0;
	}

	if (object == 0) {
	dn = DMU_META_DNODE(os);
	dmu_object_info_from_dnode(dn, &doi);
	} else {
	/*
	* Encrypted datasets will have sensitive bonus buffers
	* encrypted. Therefore we cannot hold the bonus buffer and
	* must hold the dnode itself instead.
	*/
	error = dmu_object_info(os, object, &doi);
	if (error)
	fatal("dmu_object_info() failed, errno %u", error);

	if (os->os_encrypted &&
	DMU_OT_IS_ENCRYPTED(doi.doi_bonus_type)) {
	error = dnode_hold(os, object, FTAG, &dn);
	if (error)
	fatal("dnode_hold() failed, errno %u", error);
	dnode_held = B_TRUE;
	} else {
	error = dmu_bonus_hold(os, object, FTAG, &db);
	if (error)
	fatal("dmu_bonus_hold(%llu) failed, errno %u",
	object, error);
	bonus = db->db_data;
	bsize = db->db_size;
	dn = DB_DNODE((dmu_buf_impl_t *)db);
	}
	}

	/*
	* Default to showing all object types if no flags were specified.
	*/
	if (flags != 0 && flags != ZOR_FLAG_ALL_TYPES &&
	!match_object_type(doi.doi_type, flags))
	goto out;

	if (dnode_slots_used)
	*dnode_slots_used = doi.doi_dnodesize / DNODE_MIN_SIZE;

	zdb_nicenum(doi.doi_metadata_block_size, iblk, sizeof (iblk));
	zdb_nicenum(doi.doi_data_block_size, dblk, sizeof (dblk));
	zdb_nicenum(doi.doi_max_offset, lsize, sizeof (lsize));
	zdb_nicenum(doi.doi_physical_blocks_512 << 9, asize, sizeof (asize));
	zdb_nicenum(doi.doi_bonus_size, bonus_size, sizeof (bonus_size));
	zdb_nicenum(doi.doi_dnodesize, dnsize, sizeof (dnsize));
	(void) sprintf(fill, "%6.2f", 100.0 * doi.doi_fill_count *
	doi.doi_data_block_size / (object == 0 ? DNODES_PER_BLOCK : 1) /
	doi.doi_max_offset);

	aux[0] = '\0';

	if (doi.doi_checksum != ZIO_CHECKSUM_INHERIT \|\| verbosity >= 6) {
	(void) snprintf(aux + strlen(aux), sizeof (aux) - strlen(aux),
	" (K=%s)", ZDB_CHECKSUM_NAME(doi.doi_checksum));
	}

	if (doi.doi_compress == ZIO_COMPRESS_INHERIT &&
	ZIO_COMPRESS_HASLEVEL(os->os_compress) && verbosity >= 6) {
	const char *compname = NULL;
	if (zfs_prop_index_to_string(ZFS_PROP_COMPRESSION,
	ZIO_COMPRESS_RAW(os->os_compress, os->os_complevel),
	&compname) == 0) {
	(void) snprintf(aux + strlen(aux),
	sizeof (aux) - strlen(aux), " (Z=inherit=%s)",
	compname);
	} else {
	(void) snprintf(aux + strlen(aux),
	sizeof (aux) - strlen(aux),
	" (Z=inherit=%s-unknown)",
	ZDB_COMPRESS_NAME(os->os_compress));
	}
	} else if (doi.doi_compress == ZIO_COMPRESS_INHERIT && verbosity >= 6) {
	(void) snprintf(aux + strlen(aux), sizeof (aux) - strlen(aux),
	" (Z=inherit=%s)", ZDB_COMPRESS_NAME(os->os_compress));
	} else if (doi.doi_compress != ZIO_COMPRESS_INHERIT \|\| verbosity >= 6) {
	(void) snprintf(aux + strlen(aux), sizeof (aux) - strlen(aux),
	" (Z=%s)", ZDB_COMPRESS_NAME(doi.doi_compress));
	}

	(void) printf("%10lld %3u %5s %5s %5s %6s %5s %6s %s%s\n",
	(u_longlong_t)object, doi.doi_indirection, iblk, dblk,
	asize, dnsize, lsize, fill, zdb_ot_name(doi.doi_type), aux);

	if (doi.doi_bonus_type != DMU_OT_NONE && verbosity > 3) {
	(void) printf("%10s %3s %5s %5s %5s %5s %5s %6s %s\n",
	"", "", "", "", "", "", bonus_size, "bonus",
	zdb_ot_name(doi.doi_bonus_type));
	}

	if (verbosity >= 4) {
	(void) printf("\tdnode flags: %s%s%s%s\n",
	(dn->dn_phys->dn_flags & DNODE_FLAG_USED_BYTES) ?
	"USED_BYTES " : "",
	(dn->dn_phys->dn_flags & DNODE_FLAG_USERUSED_ACCOUNTED) ?
	"USERUSED_ACCOUNTED " : "",
	(dn->dn_phys->dn_flags & DNODE_FLAG_USEROBJUSED_ACCOUNTED) ?
	"USEROBJUSED_ACCOUNTED " : "",
	(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR) ?
	"SPILL_BLKPTR" : "");
	(void) printf("\tdnode maxblkid: %llu\n",
	(longlong_t)dn->dn_phys->dn_maxblkid);

	if (!dnode_held) {
	object_viewer[ZDB_OT_TYPE(doi.doi_bonus_type)](os,
	object, bonus, bsize);
	} else {
	(void) printf("\t\t(bonus encrypted)\n");
	}

	if (!os->os_encrypted \|\| !DMU_OT_IS_ENCRYPTED(doi.doi_type)) {
	object_viewer[ZDB_OT_TYPE(doi.doi_type)](os, object,
	NULL, 0);
	} else {
	(void) printf("\t\t(object encrypted)\n");
	}

	*print_header = B_TRUE;
	}

	if (verbosity >= 5)
	dump_indirect(dn);

	if (verbosity >= 5) {
	/*
	* Report the list of segments that comprise the object.
	*/
	uint64_t start = 0;
	uint64_t end;
	uint64_t blkfill = 1;
	int minlvl = 1;

	if (dn->dn_type == DMU_OT_DNODE) {
	minlvl = 0;
	blkfill = DNODES_PER_BLOCK;
	}

	for (;;) {
	char segsize[32];
	/* make sure nicenum has enough space */
	CTASSERT(sizeof (segsize) >= NN_NUMBUF_SZ);
	error = dnode_next_offset(dn,
	0, &start, minlvl, blkfill, 0);
	if (error)
	break;
	end = start;
	error = dnode_next_offset(dn,
	DNODE_FIND_HOLE, &end, minlvl, blkfill, 0);
	zdb_nicenum(end - start, segsize, sizeof (segsize));
	(void) printf("\t\tsegment [%016llx, %016llx)"
	" size %5s\n", (u_longlong_t)start,
	(u_longlong_t)end, segsize);
	if (error)
	break;
	start = end;
	}
	}

	out:
	if (db != NULL)
	dmu_buf_rele(db, FTAG);
	if (dnode_held)
	dnode_rele(dn, FTAG);
	}

	static void
	count_dir_mos_objects(dsl_dir_t *dd)
	{
	mos_obj_refd(dd->dd_object);
	mos_obj_refd(dsl_dir_phys(dd)->dd_child_dir_zapobj);
	mos_obj_refd(dsl_dir_phys(dd)->dd_deleg_zapobj);
	mos_obj_refd(dsl_dir_phys(dd)->dd_props_zapobj);
	mos_obj_refd(dsl_dir_phys(dd)->dd_clones);

	/*
	* The dd_crypto_obj can be referenced by multiple dsl_dir's.
	* Ignore the references after the first one.
	*/
	mos_obj_refd_multiple(dd->dd_crypto_obj);
	}

	static void
	count_ds_mos_objects(dsl_dataset_t *ds)
	{
	mos_obj_refd(ds->ds_object);
	mos_obj_refd(dsl_dataset_phys(ds)->ds_next_clones_obj);
	mos_obj_refd(dsl_dataset_phys(ds)->ds_props_obj);
	mos_obj_refd(dsl_dataset_phys(ds)->ds_userrefs_obj);
	mos_obj_refd(dsl_dataset_phys(ds)->ds_snapnames_zapobj);
	mos_obj_refd(ds->ds_bookmarks_obj);

	if (!dsl_dataset_is_snapshot(ds)) {
	count_dir_mos_objects(ds->ds_dir);
	}
	}

	static const char *objset_types[DMU_OST_NUMTYPES] = {
	"NONE", "META", "ZPL", "ZVOL", "OTHER", "ANY" };

	/*
	* Parse a string denoting a range of object IDs of the form
	* <start>[:<end>[:flags]], and store the results in zor.
	* Return 0 on success. On error, return 1 and update the msg
	* pointer to point to a descriptive error message.
	*/
	static int
	parse_object_range(char range, zopt_object_range_t zor, char **msg)
	{
	uint64_t flags = 0;
	char p, s, dup, flagstr;
	size_t len;
	int i;
	int rc = 0;

	if (strchr(range, ':') == NULL) {
	zor->zor_obj_start = strtoull(range, &p, 0);
	if (*p != '\0') {
	*msg = "Invalid characters in object ID";
	rc = 1;
	}
	zor->zor_obj_end = zor->zor_obj_start;
	return (rc);
	}

	if (strchr(range, ':') == range) {
	*msg = "Invalid leading colon";
	rc = 1;
	return (rc);
	}

	len = strlen(range);
	if (range[len - 1] == ':') {
	*msg = "Invalid trailing colon";
	rc = 1;
	return (rc);
	}

	dup = strdup(range);
	s = strtok(dup, ":");
	zor->zor_obj_start = strtoull(s, &p, 0);

	if (*p != '\0') {
	*msg = "Invalid characters in start object ID";
	rc = 1;
	goto out;
	}

	s = strtok(NULL, ":");
	zor->zor_obj_end = strtoull(s, &p, 0);

	if (*p != '\0') {
	*msg = "Invalid characters in end object ID";
	rc = 1;
	goto out;
	}

	if (zor->zor_obj_start > zor->zor_obj_end) {
	*msg = "Start object ID may not exceed end object ID";
	rc = 1;
	goto out;
	}

	s = strtok(NULL, ":");
	if (s == NULL) {
	zor->zor_flags = ZOR_FLAG_ALL_TYPES;
	goto out;
	} else if (strtok(NULL, ":") != NULL) {
	*msg = "Invalid colon-delimited field after flags";
	rc = 1;
	goto out;
	}

	flagstr = s;
	for (i = 0; flagstr[i]; i++) {
	int bit;
	boolean_t negation = (flagstr[i] == '-');

	if (negation) {
	i++;
	if (flagstr[i] == '\0') {
	*msg = "Invalid trailing negation operator";
	rc = 1;
	goto out;
	}
	}
	bit = flagbits[(uchar_t)flagstr[i]];
	if (bit == 0) {
	*msg = "Invalid flag";
	rc = 1;
	goto out;
	}
	if (negation)
	flags &= ~bit;
	else
	flags \|= bit;
	}
	zor->zor_flags = flags;

	out:
	free(dup);
	return (rc);
	}

	static void
	dump_objset(objset_t *os)
	{
	dmu_objset_stats_t dds = { 0 };
	uint64_t object, object_count;
	uint64_t refdbytes, usedobjs, scratch;
	char numbuf[32];
	char blkbuf[BP_SPRINTF_LEN + 20];
	char osname[ZFS_MAX_DATASET_NAME_LEN];
	const char *type = "UNKNOWN";
	int verbosity = dump_opt['d'];
	boolean_t print_header;
	unsigned i;
	int error;
	uint64_t total_slots_used = 0;
	uint64_t max_slot_used = 0;
	uint64_t dnode_slots;
	uint64_t obj_start;
	uint64_t obj_end;
	uint64_t flags;

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (numbuf) >= NN_NUMBUF_SZ);

	dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
	dmu_objset_fast_stat(os, &dds);
	dsl_pool_config_exit(dmu_objset_pool(os), FTAG);

	print_header = B_TRUE;

	if (dds.dds_type < DMU_OST_NUMTYPES)
	type = objset_types[dds.dds_type];

	if (dds.dds_type == DMU_OST_META) {
	dds.dds_creation_txg = TXG_INITIAL;
	usedobjs = BP_GET_FILL(os->os_rootbp);
	refdbytes = dsl_dir_phys(os->os_spa->spa_dsl_pool->dp_mos_dir)->
	dd_used_bytes;
	} else {
	dmu_objset_space(os, &refdbytes, &scratch, &usedobjs, &scratch);
	}

	ASSERT3U(usedobjs, ==, BP_GET_FILL(os->os_rootbp));

	zdb_nicenum(refdbytes, numbuf, sizeof (numbuf));

	if (verbosity >= 4) {
	(void) snprintf(blkbuf, sizeof (blkbuf), ", rootbp ");
	(void) snprintf_blkptr(blkbuf + strlen(blkbuf),
	sizeof (blkbuf) - strlen(blkbuf), os->os_rootbp);
	} else {
	blkbuf[0] = '\0';
	}

	dmu_objset_name(os, osname);

	(void) printf("Dataset %s [%s], ID %llu, cr_txg %llu, "
	"%s, %llu objects%s%s\n",
	osname, type, (u_longlong_t)dmu_objset_id(os),
	(u_longlong_t)dds.dds_creation_txg,
	numbuf, (u_longlong_t)usedobjs, blkbuf,
	(dds.dds_inconsistent) ? " (inconsistent)" : "");

	for (i = 0; i < zopt_object_args; i++) {
	obj_start = zopt_object_ranges[i].zor_obj_start;
	obj_end = zopt_object_ranges[i].zor_obj_end;
	flags = zopt_object_ranges[i].zor_flags;

	object = obj_start;
	if (object == 0 \|\| obj_start == obj_end)
	dump_object(os, object, verbosity, &print_header, NULL,
	flags);
	else
	object--;

	while ((dmu_object_next(os, &object, B_FALSE, 0) == 0) &&
	object <= obj_end) {
	dump_object(os, object, verbosity, &print_header, NULL,
	flags);
	}
	}

	if (zopt_object_args > 0) {
	(void) printf("\n");
	return;
	}

	if (dump_opt['i'] != 0 \|\| verbosity >= 2)
	dump_intent_log(dmu_objset_zil(os));

	if (dmu_objset_ds(os) != NULL) {
	dsl_dataset_t *ds = dmu_objset_ds(os);
	dump_blkptr_list(&ds->ds_deadlist, "Deadlist");
	if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
	!dmu_objset_is_snapshot(os)) {
	dump_blkptr_list(&ds->ds_dir->dd_livelist, "Livelist");
	if (verify_dd_livelist(os) != 0)
	fatal("livelist is incorrect");
	}

	if (dsl_dataset_remap_deadlist_exists(ds)) {
	(void) printf("ds_remap_deadlist:\n");
	dump_blkptr_list(&ds->ds_remap_deadlist, "Deadlist");
	}
	count_ds_mos_objects(ds);
	}

	if (dmu_objset_ds(os) != NULL)
	dump_bookmarks(os, verbosity);

	if (verbosity < 2)
	return;

	if (BP_IS_HOLE(os->os_rootbp))
	return;

	dump_object(os, 0, verbosity, &print_header, NULL, 0);
	object_count = 0;
	if (DMU_USERUSED_DNODE(os) != NULL &&
	DMU_USERUSED_DNODE(os)->dn_type != 0) {
	dump_object(os, DMU_USERUSED_OBJECT, verbosity, &print_header,
	NULL, 0);
	dump_object(os, DMU_GROUPUSED_OBJECT, verbosity, &print_header,
	NULL, 0);
	}

	if (DMU_PROJECTUSED_DNODE(os) != NULL &&
	DMU_PROJECTUSED_DNODE(os)->dn_type != 0)
	dump_object(os, DMU_PROJECTUSED_OBJECT, verbosity,
	&print_header, NULL, 0);

	object = 0;
	while ((error = dmu_object_next(os, &object, B_FALSE, 0)) == 0) {
	dump_object(os, object, verbosity, &print_header, &dnode_slots,
	0);
	object_count++;
	total_slots_used += dnode_slots;
	max_slot_used = object + dnode_slots - 1;
	}

	(void) printf("\n");

	(void) printf(" Dnode slots:\n");
	(void) printf("\tTotal used: %10llu\n",
	(u_longlong_t)total_slots_used);
	(void) printf("\tMax used: %10llu\n",
	(u_longlong_t)max_slot_used);
	(void) printf("\tPercent empty: %10lf\n",
	(double)(max_slot_used - total_slots_used)*100 /
	(double)max_slot_used);
	(void) printf("\n");

	if (error != ESRCH) {
	(void) fprintf(stderr, "dmu_object_next() = %d\n", error);
	abort();
	}

	ASSERT3U(object_count, ==, usedobjs);

	if (leaked_objects != 0) {
	(void) printf("%d potentially leaked objects detected\n",
	leaked_objects);
	leaked_objects = 0;
	}
	}

	static void
	dump_uberblock(uberblock_t ub, const char header, const char *footer)
	{
	time_t timestamp = ub->ub_timestamp;

	(void) printf("%s", header ? header : "");
	(void) printf("\tmagic = %016llx\n", (u_longlong_t)ub->ub_magic);
	(void) printf("\tversion = %llu\n", (u_longlong_t)ub->ub_version);
	(void) printf("\ttxg = %llu\n", (u_longlong_t)ub->ub_txg);
	(void) printf("\tguid_sum = %llu\n", (u_longlong_t)ub->ub_guid_sum);
	(void) printf("\ttimestamp = %llu UTC = %s",
	(u_longlong_t)ub->ub_timestamp, asctime(localtime(&timestamp)));

	(void) printf("\tmmp_magic = %016llx\n",
	(u_longlong_t)ub->ub_mmp_magic);
	if (MMP_VALID(ub)) {
	(void) printf("\tmmp_delay = %0llu\n",
	(u_longlong_t)ub->ub_mmp_delay);
	if (MMP_SEQ_VALID(ub))
	(void) printf("\tmmp_seq = %u\n",
	(unsigned int) MMP_SEQ(ub));
	if (MMP_FAIL_INT_VALID(ub))
	(void) printf("\tmmp_fail = %u\n",
	(unsigned int) MMP_FAIL_INT(ub));
	if (MMP_INTERVAL_VALID(ub))
	(void) printf("\tmmp_write = %u\n",
	(unsigned int) MMP_INTERVAL(ub));
	/* After MMP_* to make summarize_uberblock_mmp cleaner */
	(void) printf("\tmmp_valid = %x\n",
	(unsigned int) ub->ub_mmp_config & 0xFF);
	}

	if (dump_opt['u'] >= 4) {
	char blkbuf[BP_SPRINTF_LEN];
	snprintf_blkptr(blkbuf, sizeof (blkbuf), &ub->ub_rootbp);
	(void) printf("\trootbp = %s\n", blkbuf);
	}
	(void) printf("\tcheckpoint_txg = %llu\n",
	(u_longlong_t)ub->ub_checkpoint_txg);
	(void) printf("%s", footer ? footer : "");
	}

	static void
	dump_config(spa_t *spa)
	{
	dmu_buf_t *db;
	size_t nvsize = 0;
	int error = 0;


	error = dmu_bonus_hold(spa->spa_meta_objset,
	spa->spa_config_object, FTAG, &db);

	if (error == 0) {
	nvsize = (uint64_t )db->db_data;
	dmu_buf_rele(db, FTAG);

	(void) printf("\nMOS Configuration:\n");
	dump_packed_nvlist(spa->spa_meta_objset,
	spa->spa_config_object, (void *)&nvsize, 1);
	} else {
	(void) fprintf(stderr, "dmu_bonus_hold(%llu) failed, errno %d",
	(u_longlong_t)spa->spa_config_object, error);
	}
	}

	static void
	dump_cachefile(const char *cachefile)
	{
	int fd;
	struct stat64 statbuf;
	char *buf;
	nvlist_t *config;

	if ((fd = open64(cachefile, O_RDONLY)) < 0) {
	(void) printf("cannot open '%s': %s\n", cachefile,
	strerror(errno));
	exit(1);
	}

	if (fstat64(fd, &statbuf) != 0) {
	(void) printf("failed to stat '%s': %s\n", cachefile,
	strerror(errno));
	exit(1);
	}

	if ((buf = malloc(statbuf.st_size)) == NULL) {
	(void) fprintf(stderr, "failed to allocate %llu bytes\n",
	(u_longlong_t)statbuf.st_size);
	exit(1);
	}

	if (read(fd, buf, statbuf.st_size) != statbuf.st_size) {
	(void) fprintf(stderr, "failed to read %llu bytes\n",
	(u_longlong_t)statbuf.st_size);
	exit(1);
	}

	(void) close(fd);

	if (nvlist_unpack(buf, statbuf.st_size, &config, 0) != 0) {
	(void) fprintf(stderr, "failed to unpack nvlist\n");
	exit(1);
	}

	free(buf);

	dump_nvlist(config, 0);

	nvlist_free(config);
	}

	/*
	* ZFS label nvlist stats
	*/
	typedef struct zdb_nvl_stats {
	int zns_list_count;
	int zns_leaf_count;
	size_t zns_leaf_largest;
	size_t zns_leaf_total;
	nvlist_t *zns_string;
	nvlist_t *zns_uint64;
	nvlist_t *zns_boolean;
	} zdb_nvl_stats_t;

	static void
	collect_nvlist_stats(nvlist_t nvl, zdb_nvl_stats_t stats)
	{
	nvlist_t list, *array;
	nvpair_t *nvp = NULL;
	char *name;
	uint_t i, items;

	stats->zns_list_count++;

	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
	name = nvpair_name(nvp);

	switch (nvpair_type(nvp)) {
	case DATA_TYPE_STRING:
	fnvlist_add_string(stats->zns_string, name,
	fnvpair_value_string(nvp));
	break;
	case DATA_TYPE_UINT64:
	fnvlist_add_uint64(stats->zns_uint64, name,
	fnvpair_value_uint64(nvp));
	break;
	case DATA_TYPE_BOOLEAN:
	fnvlist_add_boolean(stats->zns_boolean, name);
	break;
	case DATA_TYPE_NVLIST:
	if (nvpair_value_nvlist(nvp, &list) == 0)
	collect_nvlist_stats(list, stats);
	break;
	case DATA_TYPE_NVLIST_ARRAY:
	if (nvpair_value_nvlist_array(nvp, &array, &items) != 0)
	break;

	for (i = 0; i < items; i++) {
	collect_nvlist_stats(array[i], stats);

	/* collect stats on leaf vdev */
	if (strcmp(name, "children") == 0) {
	size_t size;

	(void) nvlist_size(array[i], &size,
	NV_ENCODE_XDR);
	stats->zns_leaf_total += size;
	if (size > stats->zns_leaf_largest)
	stats->zns_leaf_largest = size;
	stats->zns_leaf_count++;
	}
	}
	break;
	default:
	(void) printf("skip type %d!\n", (int)nvpair_type(nvp));
	}
	}
	}

	static void
	dump_nvlist_stats(nvlist_t *nvl, size_t cap)
	{
	zdb_nvl_stats_t stats = { 0 };
	size_t size, sum = 0, total;
	size_t noise;

	/* requires nvlist with non-unique names for stat collection */
	VERIFY0(nvlist_alloc(&stats.zns_string, 0, 0));
	VERIFY0(nvlist_alloc(&stats.zns_uint64, 0, 0));
	VERIFY0(nvlist_alloc(&stats.zns_boolean, 0, 0));
	VERIFY0(nvlist_size(stats.zns_boolean, &noise, NV_ENCODE_XDR));

	(void) printf("\n\nZFS Label NVList Config Stats:\n");

	VERIFY0(nvlist_size(nvl, &total, NV_ENCODE_XDR));
	(void) printf(" %d bytes used, %d bytes free (using %4.1f%%)\n\n",
	(int)total, (int)(cap - total), 100.0 * total / cap);

	collect_nvlist_stats(nvl, &stats);

	VERIFY0(nvlist_size(stats.zns_uint64, &size, NV_ENCODE_XDR));
	size -= noise;
	sum += size;
	(void) printf("%12s %4d %6d bytes (%5.2f%%)\n", "integers:",
	(int)fnvlist_num_pairs(stats.zns_uint64),
	(int)size, 100.0 * size / total);

	VERIFY0(nvlist_size(stats.zns_string, &size, NV_ENCODE_XDR));
	size -= noise;
	sum += size;
	(void) printf("%12s %4d %6d bytes (%5.2f%%)\n", "strings:",
	(int)fnvlist_num_pairs(stats.zns_string),
	(int)size, 100.0 * size / total);

	VERIFY0(nvlist_size(stats.zns_boolean, &size, NV_ENCODE_XDR));
	size -= noise;
	sum += size;
	(void) printf("%12s %4d %6d bytes (%5.2f%%)\n", "booleans:",
	(int)fnvlist_num_pairs(stats.zns_boolean),
	(int)size, 100.0 * size / total);

	size = total - sum; /* treat remainder as nvlist overhead */
	(void) printf("%12s %4d %6d bytes (%5.2f%%)\n\n", "nvlists:",
	stats.zns_list_count, (int)size, 100.0 * size / total);

	if (stats.zns_leaf_count > 0) {
	size_t average = stats.zns_leaf_total / stats.zns_leaf_count;

	(void) printf("%12s %4d %6d bytes average\n", "leaf vdevs:",
	stats.zns_leaf_count, (int)average);
	(void) printf("%24d bytes largest\n",
	(int)stats.zns_leaf_largest);

	if (dump_opt['l'] >= 3 && average > 0)
	(void) printf(" space for %d additional leaf vdevs\n",
	(int)((cap - total) / average));
	}
	(void) printf("\n");

	nvlist_free(stats.zns_string);
	nvlist_free(stats.zns_uint64);
	nvlist_free(stats.zns_boolean);
	}

	typedef struct cksum_record {
	zio_cksum_t cksum;
	boolean_t labels[VDEV_LABELS];
	avl_node_t link;
	} cksum_record_t;

	static int
	cksum_record_compare(const void x1, const void x2)
	{
	const cksum_record_t l = (cksum_record_t )x1;
	const cksum_record_t r = (cksum_record_t )x2;
	int arraysize = ARRAY_SIZE(l->cksum.zc_word);
	int difference;

	for (int i = 0; i < arraysize; i++) {
	difference = TREE_CMP(l->cksum.zc_word[i], r->cksum.zc_word[i]);
	if (difference)
	break;
	}

	return (difference);
	}

	static cksum_record_t *
	cksum_record_alloc(zio_cksum_t *cksum, int l)
	{
	cksum_record_t *rec;

	rec = umem_zalloc(sizeof (*rec), UMEM_NOFAIL);
	rec->cksum = *cksum;
	rec->labels[l] = B_TRUE;

	return (rec);
	}

	static cksum_record_t *
	cksum_record_lookup(avl_tree_t tree, zio_cksum_t cksum)
	{
	cksum_record_t lookup = { .cksum = *cksum };
	avl_index_t where;

	return (avl_find(tree, &lookup, &where));
	}

	static cksum_record_t *
	cksum_record_insert(avl_tree_t tree, zio_cksum_t cksum, int l)
	{
	cksum_record_t *rec;

	rec = cksum_record_lookup(tree, cksum);
	if (rec) {
	rec->labels[l] = B_TRUE;
	} else {
	rec = cksum_record_alloc(cksum, l);
	avl_add(tree, rec);
	}

	return (rec);
	}

	static int
	first_label(cksum_record_t *rec)
	{
	for (int i = 0; i < VDEV_LABELS; i++)
	if (rec->labels[i])
	return (i);

	return (-1);
	}

	static void
	print_label_numbers(char prefix, cksum_record_t rec)
	{
	printf("%s", prefix);
	for (int i = 0; i < VDEV_LABELS; i++)
	if (rec->labels[i] == B_TRUE)
	printf("%d ", i);
	printf("\n");
	}

	#define MAX_UBERBLOCK_COUNT (VDEV_UBERBLOCK_RING >> UBERBLOCK_SHIFT)

	typedef struct zdb_label {
	vdev_label_t label;
	nvlist_t *config_nv;
	cksum_record_t *config;
	cksum_record_t *uberblocks[MAX_UBERBLOCK_COUNT];
	boolean_t header_printed;
	boolean_t read_failed;
	} zdb_label_t;

	static void
	print_label_header(zdb_label_t *label, int l)
	{

	if (dump_opt['q'])
	return;

	if (label->header_printed == B_TRUE)
	return;

	(void) printf("------------------------------------\n");
	(void) printf("LABEL %d\n", l);
	(void) printf("------------------------------------\n");

	label->header_printed = B_TRUE;
	}

	static void
	print_l2arc_header(void)
	{
	(void) printf("------------------------------------\n");
	(void) printf("L2ARC device header\n");
	(void) printf("------------------------------------\n");
	}

	static void
	print_l2arc_log_blocks(void)
	{
	(void) printf("------------------------------------\n");
	(void) printf("L2ARC device log blocks\n");
	(void) printf("------------------------------------\n");
	}

	static void
	dump_l2arc_log_entries(uint64_t log_entries,
	l2arc_log_ent_phys_t *le, uint64_t i)
	{
	for (int j = 0; j < log_entries; j++) {
	dva_t dva = le[j].le_dva;
	(void) printf("lb[%4llu]\tle[%4d]\tDVA asize: %llu, "
	"vdev: %llu, offset: %llu\n",
	(u_longlong_t)i, j + 1,
	(u_longlong_t)DVA_GET_ASIZE(&dva),
	(u_longlong_t)DVA_GET_VDEV(&dva),
	(u_longlong_t)DVA_GET_OFFSET(&dva));
	(void) printf("\|\t\t\t\tbirth: %llu\n",
	(u_longlong_t)le[j].le_birth);
	(void) printf("\|\t\t\t\tlsize: %llu\n",
	(u_longlong_t)L2BLK_GET_LSIZE((&le[j])->le_prop));
	(void) printf("\|\t\t\t\tpsize: %llu\n",
	(u_longlong_t)L2BLK_GET_PSIZE((&le[j])->le_prop));
	(void) printf("\|\t\t\t\tcompr: %llu\n",
	(u_longlong_t)L2BLK_GET_COMPRESS((&le[j])->le_prop));
	(void) printf("\|\t\t\t\tcomplevel: %llu\n",
	(u_longlong_t)(&le[j])->le_complevel);
	(void) printf("\|\t\t\t\ttype: %llu\n",
	(u_longlong_t)L2BLK_GET_TYPE((&le[j])->le_prop));
	(void) printf("\|\t\t\t\tprotected: %llu\n",
	(u_longlong_t)L2BLK_GET_PROTECTED((&le[j])->le_prop));
	(void) printf("\|\t\t\t\tprefetch: %llu\n",
	(u_longlong_t)L2BLK_GET_PREFETCH((&le[j])->le_prop));
	(void) printf("\|\t\t\t\taddress: %llu\n",
	(u_longlong_t)le[j].le_daddr);
	(void) printf("\|\t\t\t\tARC state: %llu\n",
	(u_longlong_t)L2BLK_GET_STATE((&le[j])->le_prop));
	(void) printf("\|\n");
	}
	(void) printf("\n");
	}

	static void
	dump_l2arc_log_blkptr(l2arc_log_blkptr_t lbps)
	{
	(void) printf("\|\t\tdaddr: %llu\n", (u_longlong_t)lbps.lbp_daddr);
	(void) printf("\|\t\tpayload_asize: %llu\n",
	(u_longlong_t)lbps.lbp_payload_asize);
	(void) printf("\|\t\tpayload_start: %llu\n",
	(u_longlong_t)lbps.lbp_payload_start);
	(void) printf("\|\t\tlsize: %llu\n",
	(u_longlong_t)L2BLK_GET_LSIZE((&lbps)->lbp_prop));
	(void) printf("\|\t\tasize: %llu\n",
	(u_longlong_t)L2BLK_GET_PSIZE((&lbps)->lbp_prop));
	(void) printf("\|\t\tcompralgo: %llu\n",
	(u_longlong_t)L2BLK_GET_COMPRESS((&lbps)->lbp_prop));
	(void) printf("\|\t\tcksumalgo: %llu\n",
	(u_longlong_t)L2BLK_GET_CHECKSUM((&lbps)->lbp_prop));
	(void) printf("\|\n\n");
	}

	static void
	dump_l2arc_log_blocks(int fd, l2arc_dev_hdr_phys_t l2dhdr,
	l2arc_dev_hdr_phys_t *rebuild)
	{
	l2arc_log_blk_phys_t this_lb;
	uint64_t asize;
	l2arc_log_blkptr_t lbps[2];
	abd_t *abd;
	zio_cksum_t cksum;
	int failed = 0;
	l2arc_dev_t dev;

	if (!dump_opt['q'])
	print_l2arc_log_blocks();
	bcopy((&l2dhdr)->dh_start_lbps, lbps, sizeof (lbps));

	dev.l2ad_evict = l2dhdr.dh_evict;
	dev.l2ad_start = l2dhdr.dh_start;
	dev.l2ad_end = l2dhdr.dh_end;

	if (l2dhdr.dh_start_lbps[0].lbp_daddr == 0) {
	/* no log blocks to read */
	if (!dump_opt['q']) {
	(void) printf("No log blocks to read\n");
	(void) printf("\n");
	}
	return;
	} else {
	dev.l2ad_hand = lbps[0].lbp_daddr +
	L2BLK_GET_PSIZE((&lbps[0])->lbp_prop);
	}

	dev.l2ad_first = !!(l2dhdr.dh_flags & L2ARC_DEV_HDR_EVICT_FIRST);

	for (;;) {
	if (!l2arc_log_blkptr_valid(&dev, &lbps[0]))
	break;

	/* L2BLK_GET_PSIZE returns aligned size for log blocks */
	asize = L2BLK_GET_PSIZE((&lbps[0])->lbp_prop);
	if (pread64(fd, &this_lb, asize, lbps[0].lbp_daddr) != asize) {
	if (!dump_opt['q']) {
	(void) printf("Error while reading next log "
	"block\n\n");
	}
	break;
	}

	fletcher_4_native_varsize(&this_lb, asize, &cksum);
	if (!ZIO_CHECKSUM_EQUAL(cksum, lbps[0].lbp_cksum)) {
	failed++;
	if (!dump_opt['q']) {
	(void) printf("Invalid cksum\n");
	dump_l2arc_log_blkptr(lbps[0]);
	}
	break;
	}

	switch (L2BLK_GET_COMPRESS((&lbps[0])->lbp_prop)) {
	case ZIO_COMPRESS_OFF:
	break;
	default:
	abd = abd_alloc_for_io(asize, B_TRUE);
	abd_copy_from_buf_off(abd, &this_lb, 0, asize);
	zio_decompress_data(L2BLK_GET_COMPRESS(
	(&lbps[0])->lbp_prop), abd, &this_lb,
	asize, sizeof (this_lb), NULL);
	abd_free(abd);
	break;
	}

	if (this_lb.lb_magic == BSWAP_64(L2ARC_LOG_BLK_MAGIC))
	byteswap_uint64_array(&this_lb, sizeof (this_lb));
	if (this_lb.lb_magic != L2ARC_LOG_BLK_MAGIC) {
	if (!dump_opt['q'])
	(void) printf("Invalid log block magic\n\n");
	break;
	}

	rebuild->dh_lb_count++;
	rebuild->dh_lb_asize += asize;
	if (dump_opt['l'] > 1 && !dump_opt['q']) {
	(void) printf("lb[%4llu]\tmagic: %llu\n",
	(u_longlong_t)rebuild->dh_lb_count,
	(u_longlong_t)this_lb.lb_magic);
	dump_l2arc_log_blkptr(lbps[0]);
	}

	if (dump_opt['l'] > 2 && !dump_opt['q'])
	dump_l2arc_log_entries(l2dhdr.dh_log_entries,
	this_lb.lb_entries,
	rebuild->dh_lb_count);

	if (l2arc_range_check_overlap(lbps[1].lbp_payload_start,
	lbps[0].lbp_payload_start, dev.l2ad_evict) &&
	!dev.l2ad_first)
	break;

	lbps[0] = lbps[1];
	lbps[1] = this_lb.lb_prev_lbp;
	}

	if (!dump_opt['q']) {
	(void) printf("log_blk_count:\t %llu with valid cksum\n",
	(u_longlong_t)rebuild->dh_lb_count);
	(void) printf("\t\t %d with invalid cksum\n", failed);
	(void) printf("log_blk_asize:\t %llu\n\n",
	(u_longlong_t)rebuild->dh_lb_asize);
	}
	}

	static int
	dump_l2arc_header(int fd)
	{
	l2arc_dev_hdr_phys_t l2dhdr, rebuild;
	int error = B_FALSE;

	bzero(&l2dhdr, sizeof (l2dhdr));
	bzero(&rebuild, sizeof (rebuild));

	if (pread64(fd, &l2dhdr, sizeof (l2dhdr),
	VDEV_LABEL_START_SIZE) != sizeof (l2dhdr)) {
	error = B_TRUE;
	} else {
	if (l2dhdr.dh_magic == BSWAP_64(L2ARC_DEV_HDR_MAGIC))
	byteswap_uint64_array(&l2dhdr, sizeof (l2dhdr));

	if (l2dhdr.dh_magic != L2ARC_DEV_HDR_MAGIC)
	error = B_TRUE;
	}

	if (error) {
	(void) printf("L2ARC device header not found\n\n");
	/* Do not return an error here for backward compatibility */
	return (0);
	} else if (!dump_opt['q']) {
	print_l2arc_header();

	(void) printf(" magic: %llu\n",
	(u_longlong_t)l2dhdr.dh_magic);
	(void) printf(" version: %llu\n",
	(u_longlong_t)l2dhdr.dh_version);
	(void) printf(" pool_guid: %llu\n",
	(u_longlong_t)l2dhdr.dh_spa_guid);
	(void) printf(" flags: %llu\n",
	(u_longlong_t)l2dhdr.dh_flags);
	(void) printf(" start_lbps[0]: %llu\n",
	(u_longlong_t)
	l2dhdr.dh_start_lbps[0].lbp_daddr);
	(void) printf(" start_lbps[1]: %llu\n",
	(u_longlong_t)
	l2dhdr.dh_start_lbps[1].lbp_daddr);
	(void) printf(" log_blk_ent: %llu\n",
	(u_longlong_t)l2dhdr.dh_log_entries);
	(void) printf(" start: %llu\n",
	(u_longlong_t)l2dhdr.dh_start);
	(void) printf(" end: %llu\n",
	(u_longlong_t)l2dhdr.dh_end);
	(void) printf(" evict: %llu\n",
	(u_longlong_t)l2dhdr.dh_evict);
	(void) printf(" lb_asize_refcount: %llu\n",
	(u_longlong_t)l2dhdr.dh_lb_asize);
	(void) printf(" lb_count_refcount: %llu\n",
	(u_longlong_t)l2dhdr.dh_lb_count);
	(void) printf(" trim_action_time: %llu\n",
	(u_longlong_t)l2dhdr.dh_trim_action_time);
	(void) printf(" trim_state: %llu\n\n",
	(u_longlong_t)l2dhdr.dh_trim_state);
	}

	dump_l2arc_log_blocks(fd, l2dhdr, &rebuild);
	/*
	* The total aligned size of log blocks and the number of log blocks
	* reported in the header of the device may be less than what zdb
	* reports by dump_l2arc_log_blocks() which emulates l2arc_rebuild().
	* This happens because dump_l2arc_log_blocks() lacks the memory
	* pressure valve that l2arc_rebuild() has. Thus, if we are on a system
	* with low memory, l2arc_rebuild will exit prematurely and dh_lb_asize
	* and dh_lb_count will be lower to begin with than what exists on the
	* device. This is normal and zdb should not exit with an error. The
	* opposite case should never happen though, the values reported in the
	* header should never be higher than what dump_l2arc_log_blocks() and
	* l2arc_rebuild() report. If this happens there is a leak in the
	* accounting of log blocks.
	*/
	if (l2dhdr.dh_lb_asize > rebuild.dh_lb_asize \|\|
	l2dhdr.dh_lb_count > rebuild.dh_lb_count)
	return (1);

	return (0);
	}

	static void
	dump_config_from_label(zdb_label_t *label, size_t buflen, int l)
	{
	if (dump_opt['q'])
	return;

	if ((dump_opt['l'] < 3) && (first_label(label->config) != l))
	return;

	print_label_header(label, l);
	dump_nvlist(label->config_nv, 4);
	print_label_numbers(" labels = ", label->config);

	if (dump_opt['l'] >= 2)
	dump_nvlist_stats(label->config_nv, buflen);
	}

	#define ZDB_MAX_UB_HEADER_SIZE 32

	static void
	dump_label_uberblocks(zdb_label_t *label, uint64_t ashift, int label_num)
	{

	vdev_t vd;
	char header[ZDB_MAX_UB_HEADER_SIZE];

	vd.vdev_ashift = ashift;
	vd.vdev_top = &vd;

	for (int i = 0; i < VDEV_UBERBLOCK_COUNT(&vd); i++) {
	uint64_t uoff = VDEV_UBERBLOCK_OFFSET(&vd, i);
	uberblock_t ub = (void )((char *)&label->label + uoff);
	cksum_record_t *rec = label->uberblocks[i];

	if (rec == NULL) {
	if (dump_opt['u'] >= 2) {
	print_label_header(label, label_num);
	(void) printf(" Uberblock[%d] invalid\n", i);
	}
	continue;
	}

	if ((dump_opt['u'] < 3) && (first_label(rec) != label_num))
	continue;

	if ((dump_opt['u'] < 4) &&
	(ub->ub_mmp_magic == MMP_MAGIC) && ub->ub_mmp_delay &&
	(i >= VDEV_UBERBLOCK_COUNT(&vd) - MMP_BLOCKS_PER_LABEL))
	continue;

	print_label_header(label, label_num);
	(void) snprintf(header, ZDB_MAX_UB_HEADER_SIZE,
	" Uberblock[%d]\n", i);
	dump_uberblock(ub, header, "");
	print_label_numbers(" labels = ", rec);
	}
	}

	static char curpath[PATH_MAX];

	/*
	* Iterate through the path components, recursively passing
	* current one's obj and remaining path until we find the obj
	* for the last one.
	*/
	static int
	dump_path_impl(objset_t os, uint64_t obj, char name, uint64_t *retobj)
	{
	int err;
	boolean_t header = B_TRUE;
	uint64_t child_obj;
	char *s;
	dmu_buf_t *db;
	dmu_object_info_t doi;

	if ((s = strchr(name, '/')) != NULL)
	*s = '\0';
	err = zap_lookup(os, obj, name, 8, 1, &child_obj);

	(void) strlcat(curpath, name, sizeof (curpath));

	if (err != 0) {
	(void) fprintf(stderr, "failed to lookup %s: %s\n",
	curpath, strerror(err));
	return (err);
	}

	child_obj = ZFS_DIRENT_OBJ(child_obj);
	err = sa_buf_hold(os, child_obj, FTAG, &db);
	if (err != 0) {
	(void) fprintf(stderr,
	"failed to get SA dbuf for obj %llu: %s\n",
	(u_longlong_t)child_obj, strerror(err));
	return (EINVAL);
	}
	dmu_object_info_from_db(db, &doi);
	sa_buf_rele(db, FTAG);

	if (doi.doi_bonus_type != DMU_OT_SA &&
	doi.doi_bonus_type != DMU_OT_ZNODE) {
	(void) fprintf(stderr, "invalid bonus type %d for obj %llu\n",
	doi.doi_bonus_type, (u_longlong_t)child_obj);
	return (EINVAL);
	}

	if (dump_opt['v'] > 6) {
	(void) printf("obj=%llu %s type=%d bonustype=%d\n",
	(u_longlong_t)child_obj, curpath, doi.doi_type,
	doi.doi_bonus_type);
	}

	(void) strlcat(curpath, "/", sizeof (curpath));

	switch (doi.doi_type) {
	case DMU_OT_DIRECTORY_CONTENTS:
	if (s != NULL && *(s + 1) != '\0')
	return (dump_path_impl(os, child_obj, s + 1, retobj));
	/FALLTHROUGH/
	case DMU_OT_PLAIN_FILE_CONTENTS:
	if (retobj != NULL) {
	*retobj = child_obj;
	} else {
	dump_object(os, child_obj, dump_opt['v'], &header,
	NULL, 0);
	}
	return (0);
	default:
	(void) fprintf(stderr, "object %llu has non-file/directory "
	"type %d\n", (u_longlong_t)obj, doi.doi_type);
	break;
	}

	return (EINVAL);
	}

	/*
	* Dump the blocks for the object specified by path inside the dataset.
	*/
	static int
	dump_path(char ds, char path, uint64_t *retobj)
	{
	int err;
	objset_t *os;
	uint64_t root_obj;

	err = open_objset(ds, FTAG, &os);
	if (err != 0)
	return (err);

	err = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, &root_obj);
	if (err != 0) {
	(void) fprintf(stderr, "can't lookup root znode: %s\n",
	strerror(err));
	close_objset(os, FTAG);
	return (EINVAL);
	}

	(void) snprintf(curpath, sizeof (curpath), "dataset=%s path=/", ds);

	err = dump_path_impl(os, root_obj, path, retobj);

	close_objset(os, FTAG);
	return (err);
	}

	static int
	zdb_copy_object(objset_t os, uint64_t srcobj, char destfile)
	{
	int err = 0;
	uint64_t size, readsize, oursize, offset;
	ssize_t writesize;
	sa_handle_t *hdl;

	(void) printf("Copying object %" PRIu64 " to file %s\n", srcobj,
	destfile);

	VERIFY3P(os, ==, sa_os);
	if ((err = sa_handle_get(os, srcobj, NULL, SA_HDL_PRIVATE, &hdl))) {
	(void) printf("Failed to get handle for SA znode\n");
	return (err);
	}
	if ((err = sa_lookup(hdl, sa_attr_table[ZPL_SIZE], &size, 8))) {
	(void) sa_handle_destroy(hdl);
	return (err);
	}
	(void) sa_handle_destroy(hdl);

	(void) printf("Object %" PRIu64 " is %" PRIu64 " bytes\n", srcobj,
	size);
	if (size == 0) {
	return (EINVAL);
	}

	int fd = open(destfile, O_WRONLY \| O_CREAT \| O_TRUNC, 0644);
	/*
	* We cap the size at 1 mebibyte here to prevent
	* allocation failures and nigh-infinite printing if the
	* object is extremely large.
	*/
	oursize = MIN(size, 1 << 20);
	offset = 0;
	char *buf = kmem_alloc(oursize, KM_NOSLEEP);
	if (buf == NULL) {
	return (ENOMEM);
	}

	while (offset < size) {
	readsize = MIN(size - offset, 1 << 20);
	err = dmu_read(os, srcobj, offset, readsize, buf, 0);
	if (err != 0) {
	(void) printf("got error %u from dmu_read\n", err);
	kmem_free(buf, oursize);
	return (err);
	}
	if (dump_opt['v'] > 3) {
	(void) printf("Read offset=%" PRIu64 " size=%" PRIu64
	" error=%d\n", offset, readsize, err);
	}

	writesize = write(fd, buf, readsize);
	if (writesize < 0) {
	err = errno;
	break;
	} else if (writesize != readsize) {
	/* Incomplete write */
	(void) fprintf(stderr, "Short write, only wrote %llu of"
	" %" PRIu64 " bytes, exiting...\n",
	(u_longlong_t)writesize, readsize);
	break;
	}

	offset += readsize;
	}

	(void) close(fd);

	if (buf != NULL)
	kmem_free(buf, oursize);

	return (err);
	}

	static int
	dump_label(const char *dev)
	{
	char path[MAXPATHLEN];
	zdb_label_t labels[VDEV_LABELS];
	uint64_t psize, ashift, l2cache;
	struct stat64 statbuf;
	boolean_t config_found = B_FALSE;
	boolean_t error = B_FALSE;
	boolean_t read_l2arc_header = B_FALSE;
	avl_tree_t config_tree;
	avl_tree_t uberblock_tree;
	void node, cookie;
	int fd;

	bzero(labels, sizeof (labels));

	/*
	* Check if we were given absolute path and use it as is.
	* Otherwise if the provided vdev name doesn't point to a file,
	* try prepending expected disk paths and partition numbers.
	*/
	(void) strlcpy(path, dev, sizeof (path));
	if (dev[0] != '/' && stat64(path, &statbuf) != 0) {
	int error;

	error = zfs_resolve_shortname(dev, path, MAXPATHLEN);
	if (error == 0 && zfs_dev_is_whole_disk(path)) {
	if (zfs_append_partition(path, MAXPATHLEN) == -1)
	error = ENOENT;
	}

	if (error \|\| (stat64(path, &statbuf) != 0)) {
	(void) printf("failed to find device %s, try "
	"specifying absolute path instead\n", dev);
	return (1);
	}
	}

	if ((fd = open64(path, O_RDONLY)) < 0) {
	(void) printf("cannot open '%s': %s\n", path, strerror(errno));
	exit(1);
	}

	if (fstat64_blk(fd, &statbuf) != 0) {
	(void) printf("failed to stat '%s': %s\n", path,
	strerror(errno));
	(void) close(fd);
	exit(1);
	}

	if (S_ISBLK(statbuf.st_mode) && zfs_dev_flush(fd) != 0)
	(void) printf("failed to invalidate cache '%s' : %s\n", path,
	strerror(errno));

	avl_create(&config_tree, cksum_record_compare,
	sizeof (cksum_record_t), offsetof(cksum_record_t, link));
	avl_create(&uberblock_tree, cksum_record_compare,
	sizeof (cksum_record_t), offsetof(cksum_record_t, link));

	psize = statbuf.st_size;
	psize = P2ALIGN(psize, (uint64_t)sizeof (vdev_label_t));
	ashift = SPA_MINBLOCKSHIFT;

	/*
	* 1. Read the label from disk
	* 2. Unpack the configuration and insert in config tree.
	* 3. Traverse all uberblocks and insert in uberblock tree.
	*/
	for (int l = 0; l < VDEV_LABELS; l++) {
	zdb_label_t *label = &labels[l];
	char *buf = label->label.vl_vdev_phys.vp_nvlist;
	size_t buflen = sizeof (label->label.vl_vdev_phys.vp_nvlist);
	nvlist_t *config;
	cksum_record_t *rec;
	zio_cksum_t cksum;
	vdev_t vd;

	if (pread64(fd, &label->label, sizeof (label->label),
	vdev_label_offset(psize, l, 0)) != sizeof (label->label)) {
	if (!dump_opt['q'])
	(void) printf("failed to read label %d\n", l);
	label->read_failed = B_TRUE;
	error = B_TRUE;
	continue;
	}

	label->read_failed = B_FALSE;

	if (nvlist_unpack(buf, buflen, &config, 0) == 0) {
	nvlist_t *vdev_tree = NULL;
	size_t size;

	if ((nvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0) \|\|
	(nvlist_lookup_uint64(vdev_tree,
	ZPOOL_CONFIG_ASHIFT, &ashift) != 0))
	ashift = SPA_MINBLOCKSHIFT;

	if (nvlist_size(config, &size, NV_ENCODE_XDR) != 0)
	size = buflen;

	/* If the device is a cache device clear the header. */
	if (!read_l2arc_header) {
	if (nvlist_lookup_uint64(config,
	ZPOOL_CONFIG_POOL_STATE, &l2cache) == 0 &&
	l2cache == POOL_STATE_L2CACHE) {
	read_l2arc_header = B_TRUE;
	}
	}

	fletcher_4_native_varsize(buf, size, &cksum);
	rec = cksum_record_insert(&config_tree, &cksum, l);

	label->config = rec;
	label->config_nv = config;
	config_found = B_TRUE;
	} else {
	error = B_TRUE;
	}

	vd.vdev_ashift = ashift;
	vd.vdev_top = &vd;

	for (int i = 0; i < VDEV_UBERBLOCK_COUNT(&vd); i++) {
	uint64_t uoff = VDEV_UBERBLOCK_OFFSET(&vd, i);
	uberblock_t ub = (void )((char *)label + uoff);

	if (uberblock_verify(ub))
	continue;

	fletcher_4_native_varsize(ub, sizeof (*ub), &cksum);
	rec = cksum_record_insert(&uberblock_tree, &cksum, l);

	label->uberblocks[i] = rec;
	}
	}

	/*
	* Dump the label and uberblocks.
	*/
	for (int l = 0; l < VDEV_LABELS; l++) {
	zdb_label_t *label = &labels[l];
	size_t buflen = sizeof (label->label.vl_vdev_phys.vp_nvlist);

	if (label->read_failed == B_TRUE)
	continue;

	if (label->config_nv) {
	dump_config_from_label(label, buflen, l);
	} else {
	if (!dump_opt['q'])
	(void) printf("failed to unpack label %d\n", l);
	}

	if (dump_opt['u'])
	dump_label_uberblocks(label, ashift, l);

	nvlist_free(label->config_nv);
	}

	/*
	* Dump the L2ARC header, if existent.
	*/
	if (read_l2arc_header)
	error \|= dump_l2arc_header(fd);

	cookie = NULL;
	while ((node = avl_destroy_nodes(&config_tree, &cookie)) != NULL)
	umem_free(node, sizeof (cksum_record_t));

	cookie = NULL;
	while ((node = avl_destroy_nodes(&uberblock_tree, &cookie)) != NULL)
	umem_free(node, sizeof (cksum_record_t));

	avl_destroy(&config_tree);
	avl_destroy(&uberblock_tree);

	(void) close(fd);

	return (config_found == B_FALSE ? 2 :
	(error == B_TRUE ? 1 : 0));
	}

	static uint64_t dataset_feature_count[SPA_FEATURES];
	static uint64_t global_feature_count[SPA_FEATURES];
	static uint64_t remap_deadlist_count = 0;

	/ARGSUSED/
	static int
	dump_one_objset(const char dsname, void arg)
	{
	int error;
	objset_t *os;
	spa_feature_t f;

	error = open_objset(dsname, FTAG, &os);
	if (error != 0)
	return (0);

	for (f = 0; f < SPA_FEATURES; f++) {
	if (!dsl_dataset_feature_is_active(dmu_objset_ds(os), f))
	continue;
	ASSERT(spa_feature_table[f].fi_flags &
	ZFEATURE_FLAG_PER_DATASET);
	dataset_feature_count[f]++;
	}

	if (dsl_dataset_remap_deadlist_exists(dmu_objset_ds(os))) {
	remap_deadlist_count++;
	}

	for (dsl_bookmark_node_t *dbn =
	avl_first(&dmu_objset_ds(os)->ds_bookmarks); dbn != NULL;
	dbn = AVL_NEXT(&dmu_objset_ds(os)->ds_bookmarks, dbn)) {
	mos_obj_refd(dbn->dbn_phys.zbm_redaction_obj);
	if (dbn->dbn_phys.zbm_redaction_obj != 0)
	global_feature_count[SPA_FEATURE_REDACTION_BOOKMARKS]++;
	if (dbn->dbn_phys.zbm_flags & ZBM_FLAG_HAS_FBN)
	global_feature_count[SPA_FEATURE_BOOKMARK_WRITTEN]++;
	}

	if (dsl_deadlist_is_open(&dmu_objset_ds(os)->ds_dir->dd_livelist) &&
	!dmu_objset_is_snapshot(os)) {
	global_feature_count[SPA_FEATURE_LIVELIST]++;
	}

	dump_objset(os);
	close_objset(os, FTAG);
	fuid_table_destroy();
	return (0);
	}

	/*
	* Block statistics.
	*/
	#define PSIZE_HISTO_SIZE (SPA_OLD_MAXBLOCKSIZE / SPA_MINBLOCKSIZE + 2)
	typedef struct zdb_blkstats {
	uint64_t zb_asize;
	uint64_t zb_lsize;
	uint64_t zb_psize;
	uint64_t zb_count;
	uint64_t zb_gangs;
	uint64_t zb_ditto_samevdev;
	uint64_t zb_ditto_same_ms;
	uint64_t zb_psize_histogram[PSIZE_HISTO_SIZE];
	} zdb_blkstats_t;

	/*
	* Extended object types to report deferred frees and dedup auto-ditto blocks.
	*/
	#define ZDB_OT_DEFERRED (DMU_OT_NUMTYPES + 0)
	#define ZDB_OT_DITTO (DMU_OT_NUMTYPES + 1)
	#define ZDB_OT_OTHER (DMU_OT_NUMTYPES + 2)
	#define ZDB_OT_TOTAL (DMU_OT_NUMTYPES + 3)

	static const char *zdb_ot_extname[] = {
	"deferred free",
	"dedup ditto",
	"other",
	"Total",
	};

	#define ZB_TOTAL DN_MAX_LEVELS
	#define SPA_MAX_FOR_16M (SPA_MAXBLOCKSHIFT+1)

	typedef struct zdb_cb {
	zdb_blkstats_t zcb_type[ZB_TOTAL + 1][ZDB_OT_TOTAL + 1];
	uint64_t zcb_removing_size;
	uint64_t zcb_checkpoint_size;
	uint64_t zcb_dedup_asize;
	uint64_t zcb_dedup_blocks;
	uint64_t zcb_psize_count[SPA_MAX_FOR_16M];
	uint64_t zcb_lsize_count[SPA_MAX_FOR_16M];
	uint64_t zcb_asize_count[SPA_MAX_FOR_16M];
	uint64_t zcb_psize_len[SPA_MAX_FOR_16M];
	uint64_t zcb_lsize_len[SPA_MAX_FOR_16M];
	uint64_t zcb_asize_len[SPA_MAX_FOR_16M];
	uint64_t zcb_psize_total;
	uint64_t zcb_lsize_total;
	uint64_t zcb_asize_total;
	uint64_t zcb_embedded_blocks[NUM_BP_EMBEDDED_TYPES];
	uint64_t zcb_embedded_histogram[NUM_BP_EMBEDDED_TYPES]
	[BPE_PAYLOAD_SIZE + 1];
	uint64_t zcb_start;
	hrtime_t zcb_lastprint;
	uint64_t zcb_totalasize;
	uint64_t zcb_errors[256];
	int zcb_readfails;
	int zcb_haderrors;
	spa_t *zcb_spa;
	uint32_t **zcb_vd_obsolete_counts;
	} zdb_cb_t;

	/* test if two DVA offsets from same vdev are within the same metaslab */
	static boolean_t
	same_metaslab(spa_t *spa, uint64_t vdev, uint64_t off1, uint64_t off2)
	{
	vdev_t *vd = vdev_lookup_top(spa, vdev);
	uint64_t ms_shift = vd->vdev_ms_shift;

	return ((off1 >> ms_shift) == (off2 >> ms_shift));
	}

	/*
	* Used to simplify reporting of the histogram data.
	*/
	typedef struct one_histo {
	char *name;
	uint64_t *count;
	uint64_t *len;
	uint64_t cumulative;
	} one_histo_t;

	/*
	* The number of separate histograms processed for psize, lsize and asize.
	*/
	#define NUM_HISTO 3

	/*
	* This routine will create a fixed column size output of three different
	* histograms showing by blocksize of 512 - 2^ SPA_MAX_FOR_16M
	* the count, length and cumulative length of the psize, lsize and
	* asize blocks.
	*
	* All three types of blocks are listed on a single line
	*
	* By default the table is printed in nicenumber format (e.g. 123K) but
	* if the '-P' parameter is specified then the full raw number (parseable)
	* is printed out.
	*/
	static void
	dump_size_histograms(zdb_cb_t *zcb)
	{
	/*
	* A temporary buffer that allows us to convert a number into
	* a string using zdb_nicenumber to allow either raw or human
	* readable numbers to be output.
	*/
	char numbuf[32];

	/*
	* Define titles which are used in the headers of the tables
	* printed by this routine.
	*/
	const char blocksize_title1[] = "block";
	const char blocksize_title2[] = "size";
	const char count_title[] = "Count";
	const char length_title[] = "Size";
	const char cumulative_title[] = "Cum.";

	/*
	* Setup the histogram arrays (psize, lsize, and asize).
	*/
	one_histo_t parm_histo[NUM_HISTO];

	parm_histo[0].name = "psize";
	parm_histo[0].count = zcb->zcb_psize_count;
	parm_histo[0].len = zcb->zcb_psize_len;
	parm_histo[0].cumulative = 0;

	parm_histo[1].name = "lsize";
	parm_histo[1].count = zcb->zcb_lsize_count;
	parm_histo[1].len = zcb->zcb_lsize_len;
	parm_histo[1].cumulative = 0;

	parm_histo[2].name = "asize";
	parm_histo[2].count = zcb->zcb_asize_count;
	parm_histo[2].len = zcb->zcb_asize_len;
	parm_histo[2].cumulative = 0;


	(void) printf("\nBlock Size Histogram\n");
	/*
	* Print the first line titles
	*/
	if (dump_opt['P'])
	(void) printf("\n%s\t", blocksize_title1);
	else
	(void) printf("\n%7s ", blocksize_title1);

	for (int j = 0; j < NUM_HISTO; j++) {
	if (dump_opt['P']) {
	if (j < NUM_HISTO - 1) {
	(void) printf("%s\t\t\t", parm_histo[j].name);
	} else {
	/* Don't print trailing spaces */
	(void) printf(" %s", parm_histo[j].name);
	}
	} else {
	if (j < NUM_HISTO - 1) {
	/* Left aligned strings in the output */
	(void) printf("%-7s ",
	parm_histo[j].name);
	} else {
	/* Don't print trailing spaces */
	(void) printf("%s", parm_histo[j].name);
	}
	}
	}
	(void) printf("\n");

	/*
	* Print the second line titles
	*/
	if (dump_opt['P']) {
	(void) printf("%s\t", blocksize_title2);
	} else {
	(void) printf("%7s ", blocksize_title2);
	}

	for (int i = 0; i < NUM_HISTO; i++) {
	if (dump_opt['P']) {
	(void) printf("%s\t%s\t%s\t",
	count_title, length_title, cumulative_title);
	} else {
	(void) printf("%7s%7s%7s",
	count_title, length_title, cumulative_title);
	}
	}
	(void) printf("\n");

	/*
	* Print the rows
	*/
	for (int i = SPA_MINBLOCKSHIFT; i < SPA_MAX_FOR_16M; i++) {

	/*
	* Print the first column showing the blocksize
	*/
	zdb_nicenum((1ULL << i), numbuf, sizeof (numbuf));

	if (dump_opt['P']) {
	printf("%s", numbuf);
	} else {
	printf("%7s:", numbuf);
	}

	/*
	* Print the remaining set of 3 columns per size:
	* for psize, lsize and asize
	*/
	for (int j = 0; j < NUM_HISTO; j++) {
	parm_histo[j].cumulative += parm_histo[j].len[i];

	zdb_nicenum(parm_histo[j].count[i],
	numbuf, sizeof (numbuf));
	if (dump_opt['P'])
	(void) printf("\t%s", numbuf);
	else
	(void) printf("%7s", numbuf);

	zdb_nicenum(parm_histo[j].len[i],
	numbuf, sizeof (numbuf));
	if (dump_opt['P'])
	(void) printf("\t%s", numbuf);
	else
	(void) printf("%7s", numbuf);

	zdb_nicenum(parm_histo[j].cumulative,
	numbuf, sizeof (numbuf));
	if (dump_opt['P'])
	(void) printf("\t%s", numbuf);
	else
	(void) printf("%7s", numbuf);
	}
	(void) printf("\n");
	}
	}

	static void
	zdb_count_block(zdb_cb_t zcb, zilog_t zilog, const blkptr_t *bp,
	dmu_object_type_t type)
	{
	uint64_t refcnt = 0;
	int i;

	ASSERT(type < ZDB_OT_TOTAL);

	if (zilog && zil_bp_tree_add(zilog, bp) != 0)
	return;

	spa_config_enter(zcb->zcb_spa, SCL_CONFIG, FTAG, RW_READER);

	for (i = 0; i < 4; i++) {
	int l = (i < 2) ? BP_GET_LEVEL(bp) : ZB_TOTAL;
	int t = (i & 1) ? type : ZDB_OT_TOTAL;
	int equal;
	zdb_blkstats_t *zb = &zcb->zcb_type[l][t];

	zb->zb_asize += BP_GET_ASIZE(bp);
	zb->zb_lsize += BP_GET_LSIZE(bp);
	zb->zb_psize += BP_GET_PSIZE(bp);
	zb->zb_count++;

	/*
	* The histogram is only big enough to record blocks up to
	* SPA_OLD_MAXBLOCKSIZE; larger blocks go into the last,
	* "other", bucket.
	*/
	unsigned idx = BP_GET_PSIZE(bp) >> SPA_MINBLOCKSHIFT;
	idx = MIN(idx, SPA_OLD_MAXBLOCKSIZE / SPA_MINBLOCKSIZE + 1);
	zb->zb_psize_histogram[idx]++;

	zb->zb_gangs += BP_COUNT_GANG(bp);

	switch (BP_GET_NDVAS(bp)) {
	case 2:
	if (DVA_GET_VDEV(&bp->blk_dva[0]) ==
	DVA_GET_VDEV(&bp->blk_dva[1])) {
	zb->zb_ditto_samevdev++;

	if (same_metaslab(zcb->zcb_spa,
	DVA_GET_VDEV(&bp->blk_dva[0]),
	DVA_GET_OFFSET(&bp->blk_dva[0]),
	DVA_GET_OFFSET(&bp->blk_dva[1])))
	zb->zb_ditto_same_ms++;
	}
	break;
	case 3:
	equal = (DVA_GET_VDEV(&bp->blk_dva[0]) ==
	DVA_GET_VDEV(&bp->blk_dva[1])) +
	(DVA_GET_VDEV(&bp->blk_dva[0]) ==
	DVA_GET_VDEV(&bp->blk_dva[2])) +
	(DVA_GET_VDEV(&bp->blk_dva[1]) ==
	DVA_GET_VDEV(&bp->blk_dva[2]));
	if (equal != 0) {
	zb->zb_ditto_samevdev++;

	if (DVA_GET_VDEV(&bp->blk_dva[0]) ==
	DVA_GET_VDEV(&bp->blk_dva[1]) &&
	same_metaslab(zcb->zcb_spa,
	DVA_GET_VDEV(&bp->blk_dva[0]),
	DVA_GET_OFFSET(&bp->blk_dva[0]),
	DVA_GET_OFFSET(&bp->blk_dva[1])))
	zb->zb_ditto_same_ms++;
	else if (DVA_GET_VDEV(&bp->blk_dva[0]) ==
	DVA_GET_VDEV(&bp->blk_dva[2]) &&
	same_metaslab(zcb->zcb_spa,
	DVA_GET_VDEV(&bp->blk_dva[0]),
	DVA_GET_OFFSET(&bp->blk_dva[0]),
	DVA_GET_OFFSET(&bp->blk_dva[2])))
	zb->zb_ditto_same_ms++;
	else if (DVA_GET_VDEV(&bp->blk_dva[1]) ==
	DVA_GET_VDEV(&bp->blk_dva[2]) &&
	same_metaslab(zcb->zcb_spa,
	DVA_GET_VDEV(&bp->blk_dva[1]),
	DVA_GET_OFFSET(&bp->blk_dva[1]),
	DVA_GET_OFFSET(&bp->blk_dva[2])))
	zb->zb_ditto_same_ms++;
	}
	break;
	}
	}

	spa_config_exit(zcb->zcb_spa, SCL_CONFIG, FTAG);

	if (BP_IS_EMBEDDED(bp)) {
	zcb->zcb_embedded_blocks[BPE_GET_ETYPE(bp)]++;
	zcb->zcb_embedded_histogram[BPE_GET_ETYPE(bp)]
	[BPE_GET_PSIZE(bp)]++;
	return;
	}
	/*
	* The binning histogram bins by powers of two up to
	* SPA_MAXBLOCKSIZE rather than creating bins for
	* every possible blocksize found in the pool.
	*/
	int bin = highbit64(BP_GET_PSIZE(bp)) - 1;

	zcb->zcb_psize_count[bin]++;
	zcb->zcb_psize_len[bin] += BP_GET_PSIZE(bp);
	zcb->zcb_psize_total += BP_GET_PSIZE(bp);

	bin = highbit64(BP_GET_LSIZE(bp)) - 1;

	zcb->zcb_lsize_count[bin]++;
	zcb->zcb_lsize_len[bin] += BP_GET_LSIZE(bp);
	zcb->zcb_lsize_total += BP_GET_LSIZE(bp);

	bin = highbit64(BP_GET_ASIZE(bp)) - 1;

	zcb->zcb_asize_count[bin]++;
	zcb->zcb_asize_len[bin] += BP_GET_ASIZE(bp);
	zcb->zcb_asize_total += BP_GET_ASIZE(bp);

	if (dump_opt['L'])
	return;

	if (BP_GET_DEDUP(bp)) {
	ddt_t *ddt;
	ddt_entry_t *dde;

	ddt = ddt_select(zcb->zcb_spa, bp);
	ddt_enter(ddt);
	dde = ddt_lookup(ddt, bp, B_FALSE);

	if (dde == NULL) {
	refcnt = 0;
	} else {
	ddt_phys_t *ddp = ddt_phys_select(dde, bp);
	ddt_phys_decref(ddp);
	refcnt = ddp->ddp_refcnt;
	if (ddt_phys_total_refcnt(dde) == 0)
	ddt_remove(ddt, dde);
	}
	ddt_exit(ddt);
	}

	VERIFY3U(zio_wait(zio_claim(NULL, zcb->zcb_spa,
	refcnt ? 0 : spa_min_claim_txg(zcb->zcb_spa),
	bp, NULL, NULL, ZIO_FLAG_CANFAIL)), ==, 0);
	}

	static void
	zdb_blkptr_done(zio_t *zio)
	{
	spa_t *spa = zio->io_spa;
	blkptr_t *bp = zio->io_bp;
	int ioerr = zio->io_error;
	zdb_cb_t *zcb = zio->io_private;
	zbookmark_phys_t *zb = &zio->io_bookmark;

	mutex_enter(&spa->spa_scrub_lock);
	spa->spa_load_verify_bytes -= BP_GET_PSIZE(bp);
	cv_broadcast(&spa->spa_scrub_io_cv);

	if (ioerr && !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) {
	char blkbuf[BP_SPRINTF_LEN];

	zcb->zcb_haderrors = 1;
	zcb->zcb_errors[ioerr]++;

	if (dump_opt['b'] >= 2)
	snprintf_blkptr(blkbuf, sizeof (blkbuf), bp);
	else
	blkbuf[0] = '\0';

	(void) printf("zdb_blkptr_cb: "
	"Got error %d reading "
	"<%llu, %llu, %lld, %llx> %s -- skipping\n",
	ioerr,
	(u_longlong_t)zb->zb_objset,
	(u_longlong_t)zb->zb_object,
	(u_longlong_t)zb->zb_level,
	(u_longlong_t)zb->zb_blkid,
	blkbuf);
	}
	mutex_exit(&spa->spa_scrub_lock);

	abd_free(zio->io_abd);
	}

	static int
	zdb_blkptr_cb(spa_t spa, zilog_t zilog, const blkptr_t *bp,
	const zbookmark_phys_t zb, const dnode_phys_t dnp, void *arg)
	{
	zdb_cb_t *zcb = arg;
	dmu_object_type_t type;
	boolean_t is_metadata;

	if (zb->zb_level == ZB_DNODE_LEVEL)
	return (0);

	if (dump_opt['b'] >= 5 && bp->blk_birth > 0) {
	char blkbuf[BP_SPRINTF_LEN];
	snprintf_blkptr(blkbuf, sizeof (blkbuf), bp);
	(void) printf("objset %llu object %llu "
	"level %lld offset 0x%llx %s\n",
	(u_longlong_t)zb->zb_objset,
	(u_longlong_t)zb->zb_object,
	(longlong_t)zb->zb_level,
	(u_longlong_t)blkid2offset(dnp, bp, zb),
	blkbuf);
	}

	if (BP_IS_HOLE(bp) \|\| BP_IS_REDACTED(bp))
	return (0);

	type = BP_GET_TYPE(bp);

	zdb_count_block(zcb, zilog, bp,
	(type & DMU_OT_NEWTYPE) ? ZDB_OT_OTHER : type);

	is_metadata = (BP_GET_LEVEL(bp) != 0 \|\| DMU_OT_IS_METADATA(type));

	if (!BP_IS_EMBEDDED(bp) &&
	(dump_opt['c'] > 1 \|\| (dump_opt['c'] && is_metadata))) {
	size_t size = BP_GET_PSIZE(bp);
	abd_t *abd = abd_alloc(size, B_FALSE);
	int flags = ZIO_FLAG_CANFAIL \| ZIO_FLAG_SCRUB \| ZIO_FLAG_RAW;

	/* If it's an intent log block, failure is expected. */
	if (zb->zb_level == ZB_ZIL_LEVEL)
	flags \|= ZIO_FLAG_SPECULATIVE;

	mutex_enter(&spa->spa_scrub_lock);
	while (spa->spa_load_verify_bytes > max_inflight_bytes)
	cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock);
	spa->spa_load_verify_bytes += size;
	mutex_exit(&spa->spa_scrub_lock);

	zio_nowait(zio_read(NULL, spa, bp, abd, size,
	zdb_blkptr_done, zcb, ZIO_PRIORITY_ASYNC_READ, flags, zb));
	}

	zcb->zcb_readfails = 0;

	/* only call gethrtime() every 100 blocks */
	static int iters;
	if (++iters > 100)
	iters = 0;
	else
	return (0);

	if (dump_opt['b'] < 5 && gethrtime() > zcb->zcb_lastprint + NANOSEC) {
	uint64_t now = gethrtime();
	char buf[10];
	uint64_t bytes = zcb->zcb_type[ZB_TOTAL][ZDB_OT_TOTAL].zb_asize;
	int kb_per_sec =
	1 + bytes / (1 + ((now - zcb->zcb_start) / 1000 / 1000));
	int sec_remaining =
	(zcb->zcb_totalasize - bytes) / 1024 / kb_per_sec;

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (buf) >= NN_NUMBUF_SZ);

	zfs_nicebytes(bytes, buf, sizeof (buf));
	(void) fprintf(stderr,
	"\r%5s completed (%4dMB/s) "
	"estimated time remaining: %uhr %02umin %02usec ",
	buf, kb_per_sec / 1024,
	sec_remaining / 60 / 60,
	sec_remaining / 60 % 60,
	sec_remaining % 60);

	zcb->zcb_lastprint = now;
	}

	return (0);
	}

	static void
	zdb_leak(void *arg, uint64_t start, uint64_t size)
	{
	vdev_t *vd = arg;

	(void) printf("leaked space: vdev %llu, offset 0x%llx, size %llu\n",
	(u_longlong_t)vd->vdev_id, (u_longlong_t)start, (u_longlong_t)size);
	}

	static metaslab_ops_t zdb_metaslab_ops = {
	NULL /* alloc */
	};

	/* ARGSUSED */
	static int
	load_unflushed_svr_segs_cb(spa_t spa, space_map_entry_t sme,
	uint64_t txg, void *arg)
	{
	spa_vdev_removal_t *svr = arg;

	uint64_t offset = sme->sme_offset;
	uint64_t size = sme->sme_run;

	/* skip vdevs we don't care about */
	if (sme->sme_vdev != svr->svr_vdev_id)
	return (0);

	vdev_t *vd = vdev_lookup_top(spa, sme->sme_vdev);
	metaslab_t *ms = vd->vdev_ms[offset >> vd->vdev_ms_shift];
	ASSERT(sme->sme_type == SM_ALLOC \|\| sme->sme_type == SM_FREE);

	if (txg < metaslab_unflushed_txg(ms))
	return (0);

	if (sme->sme_type == SM_ALLOC)
	range_tree_add(svr->svr_allocd_segs, offset, size);
	else
	range_tree_remove(svr->svr_allocd_segs, offset, size);

	return (0);
	}

	/* ARGSUSED */
	static void
	claim_segment_impl_cb(uint64_t inner_offset, vdev_t *vd, uint64_t offset,
	uint64_t size, void *arg)
	{
	/*
	* This callback was called through a remap from
	* a device being removed. Therefore, the vdev that
	* this callback is applied to is a concrete
	* vdev.
	*/
	ASSERT(vdev_is_concrete(vd));

	VERIFY0(metaslab_claim_impl(vd, offset, size,
	spa_min_claim_txg(vd->vdev_spa)));
	}

	static void
	claim_segment_cb(void *arg, uint64_t offset, uint64_t size)
	{
	vdev_t *vd = arg;

	vdev_indirect_ops.vdev_op_remap(vd, offset, size,
	claim_segment_impl_cb, NULL);
	}

	/*
	* After accounting for all allocated blocks that are directly referenced,
	* we might have missed a reference to a block from a partially complete
	* (and thus unused) indirect mapping object. We perform a secondary pass
	* through the metaslabs we have already mapped and claim the destination
	* blocks.
	*/
	static void
	zdb_claim_removing(spa_t spa, zdb_cb_t zcb)
	{
	if (dump_opt['L'])
	return;

	if (spa->spa_vdev_removal == NULL)
	return;

	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);

	spa_vdev_removal_t *svr = spa->spa_vdev_removal;
	vdev_t *vd = vdev_lookup_top(spa, svr->svr_vdev_id);
	vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;

	ASSERT0(range_tree_space(svr->svr_allocd_segs));

	range_tree_t *allocs = range_tree_create(NULL, RANGE_SEG64, NULL, 0, 0);
	for (uint64_t msi = 0; msi < vd->vdev_ms_count; msi++) {
	metaslab_t *msp = vd->vdev_ms[msi];

	ASSERT0(range_tree_space(allocs));
	if (msp->ms_sm != NULL)
	VERIFY0(space_map_load(msp->ms_sm, allocs, SM_ALLOC));
	range_tree_vacate(allocs, range_tree_add, svr->svr_allocd_segs);
	}
	range_tree_destroy(allocs);

	iterate_through_spacemap_logs(spa, load_unflushed_svr_segs_cb, svr);

	/*
	* Clear everything past what has been synced,
	* because we have not allocated mappings for
	* it yet.
	*/
	range_tree_clear(svr->svr_allocd_segs,
	vdev_indirect_mapping_max_offset(vim),
	vd->vdev_asize - vdev_indirect_mapping_max_offset(vim));

	zcb->zcb_removing_size += range_tree_space(svr->svr_allocd_segs);
	range_tree_vacate(svr->svr_allocd_segs, claim_segment_cb, vd);

	spa_config_exit(spa, SCL_CONFIG, FTAG);
	}

	/* ARGSUSED */
	static int
	increment_indirect_mapping_cb(void arg, const blkptr_t bp, boolean_t bp_freed,
	dmu_tx_t *tx)
	{
	zdb_cb_t *zcb = arg;
	spa_t *spa = zcb->zcb_spa;
	vdev_t *vd;
	const dva_t *dva = &bp->blk_dva[0];

	ASSERT(!bp_freed);
	ASSERT(!dump_opt['L']);
	ASSERT3U(BP_GET_NDVAS(bp), ==, 1);

	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
	vd = vdev_lookup_top(zcb->zcb_spa, DVA_GET_VDEV(dva));
	ASSERT3P(vd, !=, NULL);
	spa_config_exit(spa, SCL_VDEV, FTAG);

	ASSERT(vd->vdev_indirect_config.vic_mapping_object != 0);
	ASSERT3P(zcb->zcb_vd_obsolete_counts[vd->vdev_id], !=, NULL);

	vdev_indirect_mapping_increment_obsolete_count(
	vd->vdev_indirect_mapping,
	DVA_GET_OFFSET(dva), DVA_GET_ASIZE(dva),
	zcb->zcb_vd_obsolete_counts[vd->vdev_id]);

	return (0);
	}

	static uint32_t *
	zdb_load_obsolete_counts(vdev_t *vd)
	{
	vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
	spa_t *spa = vd->vdev_spa;
	spa_condensing_indirect_phys_t *scip =
	&spa->spa_condensing_indirect_phys;
	uint64_t obsolete_sm_object;
	uint32_t *counts;

	VERIFY0(vdev_obsolete_sm_object(vd, &obsolete_sm_object));
	EQUIV(obsolete_sm_object != 0, vd->vdev_obsolete_sm != NULL);
	counts = vdev_indirect_mapping_load_obsolete_counts(vim);
	if (vd->vdev_obsolete_sm != NULL) {
	vdev_indirect_mapping_load_obsolete_spacemap(vim, counts,
	vd->vdev_obsolete_sm);
	}
	if (scip->scip_vdev == vd->vdev_id &&
	scip->scip_prev_obsolete_sm_object != 0) {
	space_map_t *prev_obsolete_sm = NULL;
	VERIFY0(space_map_open(&prev_obsolete_sm, spa->spa_meta_objset,
	scip->scip_prev_obsolete_sm_object, 0, vd->vdev_asize, 0));
	vdev_indirect_mapping_load_obsolete_spacemap(vim, counts,
	prev_obsolete_sm);
	space_map_close(prev_obsolete_sm);
	}
	return (counts);
	}

	static void
	zdb_ddt_leak_init(spa_t spa, zdb_cb_t zcb)
	{
	ddt_bookmark_t ddb;
	ddt_entry_t dde;
	int error;
	int p;

	ASSERT(!dump_opt['L']);

	bzero(&ddb, sizeof (ddb));
	while ((error = ddt_walk(spa, &ddb, &dde)) == 0) {
	blkptr_t blk;
	ddt_phys_t *ddp = dde.dde_phys;

	if (ddb.ddb_class == DDT_CLASS_UNIQUE)
	return;

	ASSERT(ddt_phys_total_refcnt(&dde) > 1);

	for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
	if (ddp->ddp_phys_birth == 0)
	continue;
	ddt_bp_create(ddb.ddb_checksum,
	&dde.dde_key, ddp, &blk);
	if (p == DDT_PHYS_DITTO) {
	zdb_count_block(zcb, NULL, &blk, ZDB_OT_DITTO);
	} else {
	zcb->zcb_dedup_asize +=
	BP_GET_ASIZE(&blk) * (ddp->ddp_refcnt - 1);
	zcb->zcb_dedup_blocks++;
	}
	}
	ddt_t *ddt = spa->spa_ddt[ddb.ddb_checksum];
	ddt_enter(ddt);
	VERIFY(ddt_lookup(ddt, &blk, B_TRUE) != NULL);
	ddt_exit(ddt);
	}

	ASSERT(error == ENOENT);
	}

	typedef struct checkpoint_sm_exclude_entry_arg {
	vdev_t *cseea_vd;
	uint64_t cseea_checkpoint_size;
	} checkpoint_sm_exclude_entry_arg_t;

	static int
	checkpoint_sm_exclude_entry_cb(space_map_entry_t sme, void arg)
	{
	checkpoint_sm_exclude_entry_arg_t *cseea = arg;
	vdev_t *vd = cseea->cseea_vd;
	metaslab_t *ms = vd->vdev_ms[sme->sme_offset >> vd->vdev_ms_shift];
	uint64_t end = sme->sme_offset + sme->sme_run;

	ASSERT(sme->sme_type == SM_FREE);

	/*
	* Since the vdev_checkpoint_sm exists in the vdev level
	* and the ms_sm space maps exist in the metaslab level,
	* an entry in the checkpoint space map could theoretically
	* cross the boundaries of the metaslab that it belongs.
	*
	* In reality, because of the way that we populate and
	* manipulate the checkpoint's space maps currently,
	* there shouldn't be any entries that cross metaslabs.
	* Hence the assertion below.
	*
	* That said, there is no fundamental requirement that
	* the checkpoint's space map entries should not cross
	* metaslab boundaries. So if needed we could add code
	* that handles metaslab-crossing segments in the future.
	*/
	VERIFY3U(sme->sme_offset, >=, ms->ms_start);
	VERIFY3U(end, <=, ms->ms_start + ms->ms_size);

	/*
	* By removing the entry from the allocated segments we
	* also verify that the entry is there to begin with.
	*/
	mutex_enter(&ms->ms_lock);
	range_tree_remove(ms->ms_allocatable, sme->sme_offset, sme->sme_run);
	mutex_exit(&ms->ms_lock);

	cseea->cseea_checkpoint_size += sme->sme_run;
	return (0);
	}

	static void
	zdb_leak_init_vdev_exclude_checkpoint(vdev_t vd, zdb_cb_t zcb)
	{
	spa_t *spa = vd->vdev_spa;
	space_map_t *checkpoint_sm = NULL;
	uint64_t checkpoint_sm_obj;

	/*
	* If there is no vdev_top_zap, we are in a pool whose
	* version predates the pool checkpoint feature.
	*/
	if (vd->vdev_top_zap == 0)
	return;

	/*
	* If there is no reference of the vdev_checkpoint_sm in
	* the vdev_top_zap, then one of the following scenarios
	* is true:
	*
	* 1] There is no checkpoint
	* 2] There is a checkpoint, but no checkpointed blocks
	* have been freed yet
	* 3] The current vdev is indirect
	*
	* In these cases we return immediately.
	*/
	if (zap_contains(spa_meta_objset(spa), vd->vdev_top_zap,
	VDEV_TOP_ZAP_POOL_CHECKPOINT_SM) != 0)
	return;

	VERIFY0(zap_lookup(spa_meta_objset(spa), vd->vdev_top_zap,
	VDEV_TOP_ZAP_POOL_CHECKPOINT_SM, sizeof (uint64_t), 1,
	&checkpoint_sm_obj));

	checkpoint_sm_exclude_entry_arg_t cseea;
	cseea.cseea_vd = vd;
	cseea.cseea_checkpoint_size = 0;

	VERIFY0(space_map_open(&checkpoint_sm, spa_meta_objset(spa),
	checkpoint_sm_obj, 0, vd->vdev_asize, vd->vdev_ashift));

	VERIFY0(space_map_iterate(checkpoint_sm,
	space_map_length(checkpoint_sm),
	checkpoint_sm_exclude_entry_cb, &cseea));
	space_map_close(checkpoint_sm);

	zcb->zcb_checkpoint_size += cseea.cseea_checkpoint_size;
	}

	static void
	zdb_leak_init_exclude_checkpoint(spa_t spa, zdb_cb_t zcb)
	{
	ASSERT(!dump_opt['L']);

	vdev_t *rvd = spa->spa_root_vdev;
	for (uint64_t c = 0; c < rvd->vdev_children; c++) {
	ASSERT3U(c, ==, rvd->vdev_child[c]->vdev_id);
	zdb_leak_init_vdev_exclude_checkpoint(rvd->vdev_child[c], zcb);
	}
	}

	static int
	count_unflushed_space_cb(spa_t spa, space_map_entry_t sme,
	uint64_t txg, void *arg)
	{
	int64_t *ualloc_space = arg;

	uint64_t offset = sme->sme_offset;
	uint64_t vdev_id = sme->sme_vdev;

	vdev_t *vd = vdev_lookup_top(spa, vdev_id);
	if (!vdev_is_concrete(vd))
	return (0);

	metaslab_t *ms = vd->vdev_ms[offset >> vd->vdev_ms_shift];
	ASSERT(sme->sme_type == SM_ALLOC \|\| sme->sme_type == SM_FREE);

	if (txg < metaslab_unflushed_txg(ms))
	return (0);

	if (sme->sme_type == SM_ALLOC)
	*ualloc_space += sme->sme_run;
	else
	*ualloc_space -= sme->sme_run;

	return (0);
	}

	static int64_t
	get_unflushed_alloc_space(spa_t *spa)
	{
	if (dump_opt['L'])
	return (0);

	int64_t ualloc_space = 0;
	iterate_through_spacemap_logs(spa, count_unflushed_space_cb,
	&ualloc_space);
	return (ualloc_space);
	}

	static int
	load_unflushed_cb(spa_t spa, space_map_entry_t sme, uint64_t txg, void *arg)
	{
	maptype_t *uic_maptype = arg;

	uint64_t offset = sme->sme_offset;
	uint64_t size = sme->sme_run;
	uint64_t vdev_id = sme->sme_vdev;

	vdev_t *vd = vdev_lookup_top(spa, vdev_id);

	/* skip indirect vdevs */
	if (!vdev_is_concrete(vd))
	return (0);

	metaslab_t *ms = vd->vdev_ms[offset >> vd->vdev_ms_shift];

	ASSERT(sme->sme_type == SM_ALLOC \|\| sme->sme_type == SM_FREE);
	ASSERT(uic_maptype == SM_ALLOC \|\| uic_maptype == SM_FREE);

	if (txg < metaslab_unflushed_txg(ms))
	return (0);

	if (*uic_maptype == sme->sme_type)
	range_tree_add(ms->ms_allocatable, offset, size);
	else
	range_tree_remove(ms->ms_allocatable, offset, size);

	return (0);
	}

	static void
	load_unflushed_to_ms_allocatables(spa_t *spa, maptype_t maptype)
	{
	iterate_through_spacemap_logs(spa, load_unflushed_cb, &maptype);
	}

	static void
	load_concrete_ms_allocatable_trees(spa_t *spa, maptype_t maptype)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	for (uint64_t i = 0; i < rvd->vdev_children; i++) {
	vdev_t *vd = rvd->vdev_child[i];

	ASSERT3U(i, ==, vd->vdev_id);

	if (vd->vdev_ops == &vdev_indirect_ops)
	continue;

	for (uint64_t m = 0; m < vd->vdev_ms_count; m++) {
	metaslab_t *msp = vd->vdev_ms[m];

	(void) fprintf(stderr,
	"\rloading concrete vdev %llu, "
	"metaslab %llu of %llu ...",
	(longlong_t)vd->vdev_id,
	(longlong_t)msp->ms_id,
	(longlong_t)vd->vdev_ms_count);

	mutex_enter(&msp->ms_lock);
	range_tree_vacate(msp->ms_allocatable, NULL, NULL);

	/*
	* We don't want to spend the CPU manipulating the
	* size-ordered tree, so clear the range_tree ops.
	*/
	msp->ms_allocatable->rt_ops = NULL;

	if (msp->ms_sm != NULL) {
	VERIFY0(space_map_load(msp->ms_sm,
	msp->ms_allocatable, maptype));
	}
	if (!msp->ms_loaded)
	msp->ms_loaded = B_TRUE;
	mutex_exit(&msp->ms_lock);
	}
	}

	load_unflushed_to_ms_allocatables(spa, maptype);
	}

	/*
	* vm_idxp is an in-out parameter which (for indirect vdevs) is the
	* index in vim_entries that has the first entry in this metaslab.
	* On return, it will be set to the first entry after this metaslab.
	*/
	static void
	load_indirect_ms_allocatable_tree(vdev_t vd, metaslab_t msp,
	uint64_t *vim_idxp)
	{
	vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;

	mutex_enter(&msp->ms_lock);
	range_tree_vacate(msp->ms_allocatable, NULL, NULL);

	/*
	* We don't want to spend the CPU manipulating the
	* size-ordered tree, so clear the range_tree ops.
	*/
	msp->ms_allocatable->rt_ops = NULL;

	for (; *vim_idxp < vdev_indirect_mapping_num_entries(vim);
	(*vim_idxp)++) {
	vdev_indirect_mapping_entry_phys_t *vimep =
	&vim->vim_entries[*vim_idxp];
	uint64_t ent_offset = DVA_MAPPING_GET_SRC_OFFSET(vimep);
	uint64_t ent_len = DVA_GET_ASIZE(&vimep->vimep_dst);
	ASSERT3U(ent_offset, >=, msp->ms_start);
	if (ent_offset >= msp->ms_start + msp->ms_size)
	break;

	/*
	* Mappings do not cross metaslab boundaries,
	* because we create them by walking the metaslabs.
	*/
	ASSERT3U(ent_offset + ent_len, <=,
	msp->ms_start + msp->ms_size);
	range_tree_add(msp->ms_allocatable, ent_offset, ent_len);
	}

	if (!msp->ms_loaded)
	msp->ms_loaded = B_TRUE;
	mutex_exit(&msp->ms_lock);
	}

	static void
	zdb_leak_init_prepare_indirect_vdevs(spa_t spa, zdb_cb_t zcb)
	{
	ASSERT(!dump_opt['L']);

	vdev_t *rvd = spa->spa_root_vdev;
	for (uint64_t c = 0; c < rvd->vdev_children; c++) {
	vdev_t *vd = rvd->vdev_child[c];

	ASSERT3U(c, ==, vd->vdev_id);

	if (vd->vdev_ops != &vdev_indirect_ops)
	continue;

	/*
	* Note: we don't check for mapping leaks on
	* removing vdevs because their ms_allocatable's
	* are used to look for leaks in allocated space.
	*/
	zcb->zcb_vd_obsolete_counts[c] = zdb_load_obsolete_counts(vd);

	/*
	* Normally, indirect vdevs don't have any
	* metaslabs. We want to set them up for
	* zio_claim().
	*/
	vdev_metaslab_group_create(vd);
	VERIFY0(vdev_metaslab_init(vd, 0));

	vdev_indirect_mapping_t *vim __maybe_unused =
	vd->vdev_indirect_mapping;
	uint64_t vim_idx = 0;
	for (uint64_t m = 0; m < vd->vdev_ms_count; m++) {

	(void) fprintf(stderr,
	"\rloading indirect vdev %llu, "
	"metaslab %llu of %llu ...",
	(longlong_t)vd->vdev_id,
	(longlong_t)vd->vdev_ms[m]->ms_id,
	(longlong_t)vd->vdev_ms_count);

	load_indirect_ms_allocatable_tree(vd, vd->vdev_ms[m],
	&vim_idx);
	}
	ASSERT3U(vim_idx, ==, vdev_indirect_mapping_num_entries(vim));
	}
	}

	static void
	zdb_leak_init(spa_t spa, zdb_cb_t zcb)
	{
	zcb->zcb_spa = spa;

	if (dump_opt['L'])
	return;

	dsl_pool_t *dp = spa->spa_dsl_pool;
	vdev_t *rvd = spa->spa_root_vdev;

	/*
	* We are going to be changing the meaning of the metaslab's
	* ms_allocatable. Ensure that the allocator doesn't try to
	* use the tree.
	*/
	spa->spa_normal_class->mc_ops = &zdb_metaslab_ops;
	spa->spa_log_class->mc_ops = &zdb_metaslab_ops;
	spa->spa_embedded_log_class->mc_ops = &zdb_metaslab_ops;

	zcb->zcb_vd_obsolete_counts =
	umem_zalloc(rvd->vdev_children * sizeof (uint32_t *),
	UMEM_NOFAIL);

	/*
	* For leak detection, we overload the ms_allocatable trees
	* to contain allocated segments instead of free segments.
	* As a result, we can't use the normal metaslab_load/unload
	* interfaces.
	*/
	zdb_leak_init_prepare_indirect_vdevs(spa, zcb);
	load_concrete_ms_allocatable_trees(spa, SM_ALLOC);

	/*
	* On load_concrete_ms_allocatable_trees() we loaded all the
	* allocated entries from the ms_sm to the ms_allocatable for
	* each metaslab. If the pool has a checkpoint or is in the
	* middle of discarding a checkpoint, some of these blocks
	* may have been freed but their ms_sm may not have been
	* updated because they are referenced by the checkpoint. In
	* order to avoid false-positives during leak-detection, we
	* go through the vdev's checkpoint space map and exclude all
	* its entries from their relevant ms_allocatable.
	*
	* We also aggregate the space held by the checkpoint and add
	* it to zcb_checkpoint_size.
	*
	* Note that at this point we are also verifying that all the
	* entries on the checkpoint_sm are marked as allocated in
	* the ms_sm of their relevant metaslab.
	* [see comment in checkpoint_sm_exclude_entry_cb()]
	*/
	zdb_leak_init_exclude_checkpoint(spa, zcb);
	ASSERT3U(zcb->zcb_checkpoint_size, ==, spa_get_checkpoint_space(spa));

	/* for cleaner progress output */
	(void) fprintf(stderr, "\n");

	if (bpobj_is_open(&dp->dp_obsolete_bpobj)) {
	ASSERT(spa_feature_is_enabled(spa,
	SPA_FEATURE_DEVICE_REMOVAL));
	(void) bpobj_iterate_nofree(&dp->dp_obsolete_bpobj,
	increment_indirect_mapping_cb, zcb, NULL);
	}

	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	zdb_ddt_leak_init(spa, zcb);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	}

	static boolean_t
	zdb_check_for_obsolete_leaks(vdev_t vd, zdb_cb_t zcb)
	{
	boolean_t leaks = B_FALSE;
	vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
	uint64_t total_leaked = 0;
	boolean_t are_precise = B_FALSE;

	ASSERT(vim != NULL);

	for (uint64_t i = 0; i < vdev_indirect_mapping_num_entries(vim); i++) {
	vdev_indirect_mapping_entry_phys_t *vimep =
	&vim->vim_entries[i];
	uint64_t obsolete_bytes = 0;
	uint64_t offset = DVA_MAPPING_GET_SRC_OFFSET(vimep);
	metaslab_t *msp = vd->vdev_ms[offset >> vd->vdev_ms_shift];

	/*
	* This is not very efficient but it's easy to
	* verify correctness.
	*/
	for (uint64_t inner_offset = 0;
	inner_offset < DVA_GET_ASIZE(&vimep->vimep_dst);
	inner_offset += 1 << vd->vdev_ashift) {
	if (range_tree_contains(msp->ms_allocatable,
	offset + inner_offset, 1 << vd->vdev_ashift)) {
	obsolete_bytes += 1 << vd->vdev_ashift;
	}
	}

	int64_t bytes_leaked = obsolete_bytes -
	zcb->zcb_vd_obsolete_counts[vd->vdev_id][i];
	ASSERT3U(DVA_GET_ASIZE(&vimep->vimep_dst), >=,
	zcb->zcb_vd_obsolete_counts[vd->vdev_id][i]);

	VERIFY0(vdev_obsolete_counts_are_precise(vd, &are_precise));
	if (bytes_leaked != 0 && (are_precise \|\| dump_opt['d'] >= 5)) {
	(void) printf("obsolete indirect mapping count "
	"mismatch on %llu:%llx:%llx : %llx bytes leaked\n",
	(u_longlong_t)vd->vdev_id,
	(u_longlong_t)DVA_MAPPING_GET_SRC_OFFSET(vimep),
	(u_longlong_t)DVA_GET_ASIZE(&vimep->vimep_dst),
	(u_longlong_t)bytes_leaked);
	}
	total_leaked += ABS(bytes_leaked);
	}

	VERIFY0(vdev_obsolete_counts_are_precise(vd, &are_precise));
	if (!are_precise && total_leaked > 0) {
	int pct_leaked = total_leaked * 100 /
	vdev_indirect_mapping_bytes_mapped(vim);
	(void) printf("cannot verify obsolete indirect mapping "
	"counts of vdev %llu because precise feature was not "
	"enabled when it was removed: %d%% (%llx bytes) of mapping"
	"unreferenced\n",
	(u_longlong_t)vd->vdev_id, pct_leaked,
	(u_longlong_t)total_leaked);
	} else if (total_leaked > 0) {
	(void) printf("obsolete indirect mapping count mismatch "
	"for vdev %llu -- %llx total bytes mismatched\n",
	(u_longlong_t)vd->vdev_id,
	(u_longlong_t)total_leaked);
	leaks \|= B_TRUE;
	}

	vdev_indirect_mapping_free_obsolete_counts(vim,
	zcb->zcb_vd_obsolete_counts[vd->vdev_id]);
	zcb->zcb_vd_obsolete_counts[vd->vdev_id] = NULL;

	return (leaks);
	}

	static boolean_t
	zdb_leak_fini(spa_t spa, zdb_cb_t zcb)
	{
	if (dump_opt['L'])
	return (B_FALSE);

	boolean_t leaks = B_FALSE;
	vdev_t *rvd = spa->spa_root_vdev;
	for (unsigned c = 0; c < rvd->vdev_children; c++) {
	vdev_t *vd = rvd->vdev_child[c];

	if (zcb->zcb_vd_obsolete_counts[c] != NULL) {
	leaks \|= zdb_check_for_obsolete_leaks(vd, zcb);
	}

	for (uint64_t m = 0; m < vd->vdev_ms_count; m++) {
	metaslab_t *msp = vd->vdev_ms[m];
	ASSERT3P(msp->ms_group, ==, (msp->ms_group->mg_class ==
	spa_embedded_log_class(spa)) ?
	vd->vdev_log_mg : vd->vdev_mg);

	/*
	* ms_allocatable has been overloaded
	* to contain allocated segments. Now that
	* we finished traversing all blocks, any
	* block that remains in the ms_allocatable
	* represents an allocated block that we
	* did not claim during the traversal.
	* Claimed blocks would have been removed
	* from the ms_allocatable. For indirect
	* vdevs, space remaining in the tree
	* represents parts of the mapping that are
	* not referenced, which is not a bug.
	*/
	if (vd->vdev_ops == &vdev_indirect_ops) {
	range_tree_vacate(msp->ms_allocatable,
	NULL, NULL);
	} else {
	range_tree_vacate(msp->ms_allocatable,
	zdb_leak, vd);
	}
	if (msp->ms_loaded) {
	msp->ms_loaded = B_FALSE;
	}
	}
	}

	umem_free(zcb->zcb_vd_obsolete_counts,
	rvd->vdev_children * sizeof (uint32_t *));
	zcb->zcb_vd_obsolete_counts = NULL;

	return (leaks);
	}

	/* ARGSUSED */
	static int
	count_block_cb(void arg, const blkptr_t bp, dmu_tx_t *tx)
	{
	zdb_cb_t *zcb = arg;

	if (dump_opt['b'] >= 5) {
	char blkbuf[BP_SPRINTF_LEN];
	snprintf_blkptr(blkbuf, sizeof (blkbuf), bp);
	(void) printf("[%s] %s\n",
	"deferred free", blkbuf);
	}
	zdb_count_block(zcb, NULL, bp, ZDB_OT_DEFERRED);
	return (0);
	}

	/*
	* Iterate over livelists which have been destroyed by the user but
	* are still present in the MOS, waiting to be freed
	*/
	static void
	iterate_deleted_livelists(spa_t spa, ll_iter_t func, void arg)
	{
	objset_t *mos = spa->spa_meta_objset;
	uint64_t zap_obj;
	int err = zap_lookup(mos, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_DELETED_CLONES, sizeof (uint64_t), 1, &zap_obj);
	if (err == ENOENT)
	return;
	ASSERT0(err);

	zap_cursor_t zc;
	zap_attribute_t attr;
	dsl_deadlist_t ll;
	/* NULL out os prior to dsl_deadlist_open in case it's garbage */
	ll.dl_os = NULL;
	for (zap_cursor_init(&zc, mos, zap_obj);
	zap_cursor_retrieve(&zc, &attr) == 0;
	(void) zap_cursor_advance(&zc)) {
	dsl_deadlist_open(&ll, mos, attr.za_first_integer);
	func(&ll, arg);
	dsl_deadlist_close(&ll);
	}
	zap_cursor_fini(&zc);
	}

	static int
	bpobj_count_block_cb(void arg, const blkptr_t bp, boolean_t bp_freed,
	dmu_tx_t *tx)
	{
	ASSERT(!bp_freed);
	return (count_block_cb(arg, bp, tx));
	}

	static int
	livelist_entry_count_blocks_cb(void args, dsl_deadlist_entry_t dle)
	{
	zdb_cb_t *zbc = args;
	bplist_t blks;
	bplist_create(&blks);
	/* determine which blocks have been alloc'd but not freed */
	VERIFY0(dsl_process_sub_livelist(&dle->dle_bpobj, &blks, NULL, NULL));
	/* count those blocks */
	(void) bplist_iterate(&blks, count_block_cb, zbc, NULL);
	bplist_destroy(&blks);
	return (0);
	}

	static void
	livelist_count_blocks(dsl_deadlist_t ll, void arg)
	{
	dsl_deadlist_iterate(ll, livelist_entry_count_blocks_cb, arg);
	}

	/*
	* Count the blocks in the livelists that have been destroyed by the user
	* but haven't yet been freed.
	*/
	static void
	deleted_livelists_count_blocks(spa_t spa, zdb_cb_t zbc)
	{
	iterate_deleted_livelists(spa, livelist_count_blocks, zbc);
	}

	static void
	dump_livelist_cb(dsl_deadlist_t ll, void arg)
	{
	ASSERT3P(arg, ==, NULL);
	global_feature_count[SPA_FEATURE_LIVELIST]++;
	dump_blkptr_list(ll, "Deleted Livelist");
	dsl_deadlist_iterate(ll, sublivelist_verify_lightweight, NULL);
	}

	/*
	* Print out, register object references to, and increment feature counts for
	* livelists that have been destroyed by the user but haven't yet been freed.
	*/
	static void
	deleted_livelists_dump_mos(spa_t *spa)
	{
	uint64_t zap_obj;
	objset_t *mos = spa->spa_meta_objset;
	int err = zap_lookup(mos, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_DELETED_CLONES, sizeof (uint64_t), 1, &zap_obj);
	if (err == ENOENT)
	return;
	mos_obj_refd(zap_obj);
	iterate_deleted_livelists(spa, dump_livelist_cb, NULL);
	}

	static int
	dump_block_stats(spa_t *spa)
	{
	zdb_cb_t zcb;
	zdb_blkstats_t zb, tzb;
	uint64_t norm_alloc, norm_space, total_alloc, total_found;
	int flags = TRAVERSE_PRE \| TRAVERSE_PREFETCH_METADATA \|
	TRAVERSE_NO_DECRYPT \| TRAVERSE_HARD;
	boolean_t leaks = B_FALSE;
	int e, c, err;
	bp_embedded_type_t i;

	bzero(&zcb, sizeof (zcb));
	(void) printf("\nTraversing all blocks %s%s%s%s%s...\n\n",
	(dump_opt['c'] \|\| !dump_opt['L']) ? "to verify " : "",
	(dump_opt['c'] == 1) ? "metadata " : "",
	dump_opt['c'] ? "checksums " : "",
	(dump_opt['c'] && !dump_opt['L']) ? "and verify " : "",
	!dump_opt['L'] ? "nothing leaked " : "");

	/*
	* When leak detection is enabled we load all space maps as SM_ALLOC
	* maps, then traverse the pool claiming each block we discover. If
	* the pool is perfectly consistent, the segment trees will be empty
	* when we're done. Anything left over is a leak; any block we can't
	* claim (because it's not part of any space map) is a double
	* allocation, reference to a freed block, or an unclaimed log block.
	*
	* When leak detection is disabled (-L option) we still traverse the
	* pool claiming each block we discover, but we skip opening any space
	* maps.
	*/
	bzero(&zcb, sizeof (zdb_cb_t));
	zdb_leak_init(spa, &zcb);

	/*
	* If there's a deferred-free bplist, process that first.
	*/
	(void) bpobj_iterate_nofree(&spa->spa_deferred_bpobj,
	bpobj_count_block_cb, &zcb, NULL);

	if (spa_version(spa) >= SPA_VERSION_DEADLISTS) {
	(void) bpobj_iterate_nofree(&spa->spa_dsl_pool->dp_free_bpobj,
	bpobj_count_block_cb, &zcb, NULL);
	}

	zdb_claim_removing(spa, &zcb);

	if (spa_feature_is_active(spa, SPA_FEATURE_ASYNC_DESTROY)) {
	VERIFY3U(0, ==, bptree_iterate(spa->spa_meta_objset,
	spa->spa_dsl_pool->dp_bptree_obj, B_FALSE, count_block_cb,
	&zcb, NULL));
	}

	deleted_livelists_count_blocks(spa, &zcb);

	if (dump_opt['c'] > 1)
	flags \|= TRAVERSE_PREFETCH_DATA;

	zcb.zcb_totalasize = metaslab_class_get_alloc(spa_normal_class(spa));
	zcb.zcb_totalasize += metaslab_class_get_alloc(spa_special_class(spa));
	zcb.zcb_totalasize += metaslab_class_get_alloc(spa_dedup_class(spa));
	zcb.zcb_totalasize +=
	metaslab_class_get_alloc(spa_embedded_log_class(spa));
	zcb.zcb_start = zcb.zcb_lastprint = gethrtime();
	err = traverse_pool(spa, 0, flags, zdb_blkptr_cb, &zcb);

	/*
	* If we've traversed the data blocks then we need to wait for those
	* I/Os to complete. We leverage "The Godfather" zio to wait on
	* all async I/Os to complete.
	*/
	if (dump_opt['c']) {
	for (c = 0; c < max_ncpus; c++) {
	(void) zio_wait(spa->spa_async_zio_root[c]);
	spa->spa_async_zio_root[c] = zio_root(spa, NULL, NULL,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE \|
	ZIO_FLAG_GODFATHER);
	}
	}
	ASSERT0(spa->spa_load_verify_bytes);

	/*
	* Done after zio_wait() since zcb_haderrors is modified in
	* zdb_blkptr_done()
	*/
	zcb.zcb_haderrors \|= err;

	if (zcb.zcb_haderrors) {
	(void) printf("\nError counts:\n\n");
	(void) printf("\t%5s %s\n", "errno", "count");
	for (e = 0; e < 256; e++) {
	if (zcb.zcb_errors[e] != 0) {
	(void) printf("\t%5d %llu\n",
	e, (u_longlong_t)zcb.zcb_errors[e]);
	}
	}
	}

	/*
	* Report any leaked segments.
	*/
	leaks \|= zdb_leak_fini(spa, &zcb);

	tzb = &zcb.zcb_type[ZB_TOTAL][ZDB_OT_TOTAL];

	norm_alloc = metaslab_class_get_alloc(spa_normal_class(spa));
	norm_space = metaslab_class_get_space(spa_normal_class(spa));

	total_alloc = norm_alloc +
	metaslab_class_get_alloc(spa_log_class(spa)) +
	metaslab_class_get_alloc(spa_embedded_log_class(spa)) +
	metaslab_class_get_alloc(spa_special_class(spa)) +
	metaslab_class_get_alloc(spa_dedup_class(spa)) +
	get_unflushed_alloc_space(spa);
	total_found = tzb->zb_asize - zcb.zcb_dedup_asize +
	zcb.zcb_removing_size + zcb.zcb_checkpoint_size;

	if (total_found == total_alloc && !dump_opt['L']) {
	(void) printf("\n\tNo leaks (block sum matches space"
	" maps exactly)\n");
	} else if (!dump_opt['L']) {
	(void) printf("block traversal size %llu != alloc %llu "
	"(%s %lld)\n",
	(u_longlong_t)total_found,
	(u_longlong_t)total_alloc,
	(dump_opt['L']) ? "unreachable" : "leaked",
	(longlong_t)(total_alloc - total_found));
	leaks = B_TRUE;
	}

	if (tzb->zb_count == 0)
	return (2);

	(void) printf("\n");
	(void) printf("\t%-16s %14llu\n", "bp count:",
	(u_longlong_t)tzb->zb_count);
	(void) printf("\t%-16s %14llu\n", "ganged count:",
	(longlong_t)tzb->zb_gangs);
	(void) printf("\t%-16s %14llu avg: %6llu\n", "bp logical:",
	(u_longlong_t)tzb->zb_lsize,
	(u_longlong_t)(tzb->zb_lsize / tzb->zb_count));
	(void) printf("\t%-16s %14llu avg: %6llu compression: %6.2f\n",
	"bp physical:", (u_longlong_t)tzb->zb_psize,
	(u_longlong_t)(tzb->zb_psize / tzb->zb_count),
	(double)tzb->zb_lsize / tzb->zb_psize);
	(void) printf("\t%-16s %14llu avg: %6llu compression: %6.2f\n",
	"bp allocated:", (u_longlong_t)tzb->zb_asize,
	(u_longlong_t)(tzb->zb_asize / tzb->zb_count),
	(double)tzb->zb_lsize / tzb->zb_asize);
	(void) printf("\t%-16s %14llu ref>1: %6llu deduplication: %6.2f\n",
	"bp deduped:", (u_longlong_t)zcb.zcb_dedup_asize,
	(u_longlong_t)zcb.zcb_dedup_blocks,
	(double)zcb.zcb_dedup_asize / tzb->zb_asize + 1.0);
	(void) printf("\t%-16s %14llu used: %5.2f%%\n", "Normal class:",
	(u_longlong_t)norm_alloc, 100.0 * norm_alloc / norm_space);

	if (spa_special_class(spa)->mc_allocator[0].mca_rotor != NULL) {
	uint64_t alloc = metaslab_class_get_alloc(
	spa_special_class(spa));
	uint64_t space = metaslab_class_get_space(
	spa_special_class(spa));

	(void) printf("\t%-16s %14llu used: %5.2f%%\n",
	"Special class", (u_longlong_t)alloc,
	100.0 * alloc / space);
	}

	if (spa_dedup_class(spa)->mc_allocator[0].mca_rotor != NULL) {
	uint64_t alloc = metaslab_class_get_alloc(
	spa_dedup_class(spa));
	uint64_t space = metaslab_class_get_space(
	spa_dedup_class(spa));

	(void) printf("\t%-16s %14llu used: %5.2f%%\n",
	"Dedup class", (u_longlong_t)alloc,
	100.0 * alloc / space);
	}

	if (spa_embedded_log_class(spa)->mc_allocator[0].mca_rotor != NULL) {
	uint64_t alloc = metaslab_class_get_alloc(
	spa_embedded_log_class(spa));
	uint64_t space = metaslab_class_get_space(
	spa_embedded_log_class(spa));

	(void) printf("\t%-16s %14llu used: %5.2f%%\n",
	"Embedded log class", (u_longlong_t)alloc,
	100.0 * alloc / space);
	}

	for (i = 0; i < NUM_BP_EMBEDDED_TYPES; i++) {
	if (zcb.zcb_embedded_blocks[i] == 0)
	continue;
	(void) printf("\n");
	(void) printf("\tadditional, non-pointer bps of type %u: "
	"%10llu\n",
	i, (u_longlong_t)zcb.zcb_embedded_blocks[i]);

	if (dump_opt['b'] >= 3) {
	(void) printf("\t number of (compressed) bytes: "
	"number of bps\n");
	dump_histogram(zcb.zcb_embedded_histogram[i],
	sizeof (zcb.zcb_embedded_histogram[i]) /
	sizeof (zcb.zcb_embedded_histogram[i][0]), 0);
	}
	}

	if (tzb->zb_ditto_samevdev != 0) {
	(void) printf("\tDittoed blocks on same vdev: %llu\n",
	(longlong_t)tzb->zb_ditto_samevdev);
	}
	if (tzb->zb_ditto_same_ms != 0) {
	(void) printf("\tDittoed blocks in same metaslab: %llu\n",
	(longlong_t)tzb->zb_ditto_same_ms);
	}

	for (uint64_t v = 0; v < spa->spa_root_vdev->vdev_children; v++) {
	vdev_t *vd = spa->spa_root_vdev->vdev_child[v];
	vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;

	if (vim == NULL) {
	continue;
	}

	char mem[32];
	zdb_nicenum(vdev_indirect_mapping_num_entries(vim),
	mem, vdev_indirect_mapping_size(vim));

	(void) printf("\tindirect vdev id %llu has %llu segments "
	"(%s in memory)\n",
	(longlong_t)vd->vdev_id,
	(longlong_t)vdev_indirect_mapping_num_entries(vim), mem);
	}

	if (dump_opt['b'] >= 2) {
	int l, t, level;
	(void) printf("\nBlocks\tLSIZE\tPSIZE\tASIZE"
	"\t avg\t comp\t%%Total\tType\n");

	for (t = 0; t <= ZDB_OT_TOTAL; t++) {
	char csize[32], lsize[32], psize[32], asize[32];
	char avg[32], gang[32];
	const char *typename;

	/* make sure nicenum has enough space */
	CTASSERT(sizeof (csize) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (lsize) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (psize) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (asize) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (avg) >= NN_NUMBUF_SZ);
	CTASSERT(sizeof (gang) >= NN_NUMBUF_SZ);

	if (t < DMU_OT_NUMTYPES)
	typename = dmu_ot[t].ot_name;
	else
	typename = zdb_ot_extname[t - DMU_OT_NUMTYPES];

	if (zcb.zcb_type[ZB_TOTAL][t].zb_asize == 0) {
	(void) printf("%6s\t%5s\t%5s\t%5s"
	"\t%5s\t%5s\t%6s\t%s\n",
	"-",
	"-",
	"-",
	"-",
	"-",
	"-",
	"-",
	typename);
	continue;
	}

	for (l = ZB_TOTAL - 1; l >= -1; l--) {
	level = (l == -1 ? ZB_TOTAL : l);
	zb = &zcb.zcb_type[level][t];

	if (zb->zb_asize == 0)
	continue;

	if (dump_opt['b'] < 3 && level != ZB_TOTAL)
	continue;

	if (level == 0 && zb->zb_asize ==
	zcb.zcb_type[ZB_TOTAL][t].zb_asize)
	continue;

	zdb_nicenum(zb->zb_count, csize,
	sizeof (csize));
	zdb_nicenum(zb->zb_lsize, lsize,
	sizeof (lsize));
	zdb_nicenum(zb->zb_psize, psize,
	sizeof (psize));
	zdb_nicenum(zb->zb_asize, asize,
	sizeof (asize));
	zdb_nicenum(zb->zb_asize / zb->zb_count, avg,
	sizeof (avg));
	zdb_nicenum(zb->zb_gangs, gang, sizeof (gang));

	(void) printf("%6s\t%5s\t%5s\t%5s\t%5s"
	"\t%5.2f\t%6.2f\t",
	csize, lsize, psize, asize, avg,
	(double)zb->zb_lsize / zb->zb_psize,
	100.0 * zb->zb_asize / tzb->zb_asize);

	if (level == ZB_TOTAL)
	(void) printf("%s\n", typename);
	else
	(void) printf(" L%d %s\n",
	level, typename);

	if (dump_opt['b'] >= 3 && zb->zb_gangs > 0) {
	(void) printf("\t number of ganged "
	"blocks: %s\n", gang);
	}

	if (dump_opt['b'] >= 4) {
	(void) printf("psize "
	"(in 512-byte sectors): "
	"number of blocks\n");
	dump_histogram(zb->zb_psize_histogram,
	PSIZE_HISTO_SIZE, 0);
	}
	}
	}

	/* Output a table summarizing block sizes in the pool */
	if (dump_opt['b'] >= 2) {
	dump_size_histograms(&zcb);
	}
	}

	(void) printf("\n");

	if (leaks)
	return (2);

	if (zcb.zcb_haderrors)
	return (3);

	return (0);
	}

	typedef struct zdb_ddt_entry {
	ddt_key_t zdde_key;
	uint64_t zdde_ref_blocks;
	uint64_t zdde_ref_lsize;
	uint64_t zdde_ref_psize;
	uint64_t zdde_ref_dsize;
	avl_node_t zdde_node;
	} zdb_ddt_entry_t;

	/* ARGSUSED */
	static int
	zdb_ddt_add_cb(spa_t spa, zilog_t zilog, const blkptr_t *bp,
	const zbookmark_phys_t zb, const dnode_phys_t dnp, void *arg)
	{
	avl_tree_t *t = arg;
	avl_index_t where;
	zdb_ddt_entry_t *zdde, zdde_search;

	if (zb->zb_level == ZB_DNODE_LEVEL \|\| BP_IS_HOLE(bp) \|\|
	BP_IS_EMBEDDED(bp))
	return (0);

	if (dump_opt['S'] > 1 && zb->zb_level == ZB_ROOT_LEVEL) {
	(void) printf("traversing objset %llu, %llu objects, "
	"%lu blocks so far\n",
	(u_longlong_t)zb->zb_objset,
	(u_longlong_t)BP_GET_FILL(bp),
	avl_numnodes(t));
	}

	if (BP_IS_HOLE(bp) \|\| BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_OFF \|\|
	BP_GET_LEVEL(bp) > 0 \|\| DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))
	return (0);

	ddt_key_fill(&zdde_search.zdde_key, bp);

	zdde = avl_find(t, &zdde_search, &where);

	if (zdde == NULL) {
	zdde = umem_zalloc(sizeof (*zdde), UMEM_NOFAIL);
	zdde->zdde_key = zdde_search.zdde_key;
	avl_insert(t, zdde, where);
	}

	zdde->zdde_ref_blocks += 1;
	zdde->zdde_ref_lsize += BP_GET_LSIZE(bp);
	zdde->zdde_ref_psize += BP_GET_PSIZE(bp);
	zdde->zdde_ref_dsize += bp_get_dsize_sync(spa, bp);

	return (0);
	}

	static void
	dump_simulated_ddt(spa_t *spa)
	{
	avl_tree_t t;
	void *cookie = NULL;
	zdb_ddt_entry_t *zdde;
	ddt_histogram_t ddh_total;
	ddt_stat_t dds_total;

	bzero(&ddh_total, sizeof (ddh_total));
	bzero(&dds_total, sizeof (dds_total));
	avl_create(&t, ddt_entry_compare,
	sizeof (zdb_ddt_entry_t), offsetof(zdb_ddt_entry_t, zdde_node));

	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);

	(void) traverse_pool(spa, 0, TRAVERSE_PRE \| TRAVERSE_PREFETCH_METADATA \|
	TRAVERSE_NO_DECRYPT, zdb_ddt_add_cb, &t);

	spa_config_exit(spa, SCL_CONFIG, FTAG);

	while ((zdde = avl_destroy_nodes(&t, &cookie)) != NULL) {
	ddt_stat_t dds;
	uint64_t refcnt = zdde->zdde_ref_blocks;
	ASSERT(refcnt != 0);

	dds.dds_blocks = zdde->zdde_ref_blocks / refcnt;
	dds.dds_lsize = zdde->zdde_ref_lsize / refcnt;
	dds.dds_psize = zdde->zdde_ref_psize / refcnt;
	dds.dds_dsize = zdde->zdde_ref_dsize / refcnt;

	dds.dds_ref_blocks = zdde->zdde_ref_blocks;
	dds.dds_ref_lsize = zdde->zdde_ref_lsize;
	dds.dds_ref_psize = zdde->zdde_ref_psize;
	dds.dds_ref_dsize = zdde->zdde_ref_dsize;

	ddt_stat_add(&ddh_total.ddh_stat[highbit64(refcnt) - 1],
	&dds, 0);

	umem_free(zdde, sizeof (*zdde));
	}

	avl_destroy(&t);

	ddt_histogram_stat(&dds_total, &ddh_total);

	(void) printf("Simulated DDT histogram:\n");

	zpool_dump_ddt(&dds_total, &ddh_total);

	dump_dedup_ratio(&dds_total);
	}

	static int
	verify_device_removal_feature_counts(spa_t *spa)
	{
	uint64_t dr_feature_refcount = 0;
	uint64_t oc_feature_refcount = 0;
	uint64_t indirect_vdev_count = 0;
	uint64_t precise_vdev_count = 0;
	uint64_t obsolete_counts_object_count = 0;
	uint64_t obsolete_sm_count = 0;
	uint64_t obsolete_counts_count = 0;
	uint64_t scip_count = 0;
	uint64_t obsolete_bpobj_count = 0;
	int ret = 0;

	spa_condensing_indirect_phys_t *scip =
	&spa->spa_condensing_indirect_phys;
	if (scip->scip_next_mapping_object != 0) {
	vdev_t *vd = spa->spa_root_vdev->vdev_child[scip->scip_vdev];
	ASSERT(scip->scip_prev_obsolete_sm_object != 0);
	ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);

	(void) printf("Condensing indirect vdev %llu: new mapping "
	"object %llu, prev obsolete sm %llu\n",
	(u_longlong_t)scip->scip_vdev,
	(u_longlong_t)scip->scip_next_mapping_object,
	(u_longlong_t)scip->scip_prev_obsolete_sm_object);
	if (scip->scip_prev_obsolete_sm_object != 0) {
	space_map_t *prev_obsolete_sm = NULL;
	VERIFY0(space_map_open(&prev_obsolete_sm,
	spa->spa_meta_objset,
	scip->scip_prev_obsolete_sm_object,
	0, vd->vdev_asize, 0));
	dump_spacemap(spa->spa_meta_objset, prev_obsolete_sm);
	(void) printf("\n");
	space_map_close(prev_obsolete_sm);
	}

	scip_count += 2;
	}

	for (uint64_t i = 0; i < spa->spa_root_vdev->vdev_children; i++) {
	vdev_t *vd = spa->spa_root_vdev->vdev_child[i];
	vdev_indirect_config_t *vic = &vd->vdev_indirect_config;

	if (vic->vic_mapping_object != 0) {
	ASSERT(vd->vdev_ops == &vdev_indirect_ops \|\|
	vd->vdev_removing);
	indirect_vdev_count++;

	if (vd->vdev_indirect_mapping->vim_havecounts) {
	obsolete_counts_count++;
	}
	}

	boolean_t are_precise;
	VERIFY0(vdev_obsolete_counts_are_precise(vd, &are_precise));
	if (are_precise) {
	ASSERT(vic->vic_mapping_object != 0);
	precise_vdev_count++;
	}

	uint64_t obsolete_sm_object;
	VERIFY0(vdev_obsolete_sm_object(vd, &obsolete_sm_object));
	if (obsolete_sm_object != 0) {
	ASSERT(vic->vic_mapping_object != 0);
	obsolete_sm_count++;
	}
	}

	(void) feature_get_refcount(spa,
	&spa_feature_table[SPA_FEATURE_DEVICE_REMOVAL],
	&dr_feature_refcount);
	(void) feature_get_refcount(spa,
	&spa_feature_table[SPA_FEATURE_OBSOLETE_COUNTS],
	&oc_feature_refcount);

	if (dr_feature_refcount != indirect_vdev_count) {
	ret = 1;
	(void) printf("Number of indirect vdevs (%llu) " \
	"does not match feature count (%llu)\n",
	(u_longlong_t)indirect_vdev_count,
	(u_longlong_t)dr_feature_refcount);
	} else {
	(void) printf("Verified device_removal feature refcount " \
	"of %llu is correct\n",
	(u_longlong_t)dr_feature_refcount);
	}

	if (zap_contains(spa_meta_objset(spa), DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_OBSOLETE_BPOBJ) == 0) {
	obsolete_bpobj_count++;
	}


	obsolete_counts_object_count = precise_vdev_count;
	obsolete_counts_object_count += obsolete_sm_count;
	obsolete_counts_object_count += obsolete_counts_count;
	obsolete_counts_object_count += scip_count;
	obsolete_counts_object_count += obsolete_bpobj_count;
	obsolete_counts_object_count += remap_deadlist_count;

	if (oc_feature_refcount != obsolete_counts_object_count) {
	ret = 1;
	(void) printf("Number of obsolete counts objects (%llu) " \
	"does not match feature count (%llu)\n",
	(u_longlong_t)obsolete_counts_object_count,
	(u_longlong_t)oc_feature_refcount);
	(void) printf("pv:%llu os:%llu oc:%llu sc:%llu "
	"ob:%llu rd:%llu\n",
	(u_longlong_t)precise_vdev_count,
	(u_longlong_t)obsolete_sm_count,
	(u_longlong_t)obsolete_counts_count,
	(u_longlong_t)scip_count,
	(u_longlong_t)obsolete_bpobj_count,
	(u_longlong_t)remap_deadlist_count);
	} else {
	(void) printf("Verified indirect_refcount feature refcount " \
	"of %llu is correct\n",
	(u_longlong_t)oc_feature_refcount);
	}
	return (ret);
	}

	static void
	zdb_set_skip_mmp(char *target)
	{
	spa_t *spa;

	/*
	* Disable the activity check to allow examination of
	* active pools.
	*/
	mutex_enter(&spa_namespace_lock);
	if ((spa = spa_lookup(target)) != NULL) {
	spa->spa_import_flags \|= ZFS_IMPORT_SKIP_MMP;
	}
	mutex_exit(&spa_namespace_lock);
	}

	#define BOGUS_SUFFIX "_CHECKPOINTED_UNIVERSE"
	/*
	* Import the checkpointed state of the pool specified by the target
	* parameter as readonly. The function also accepts a pool config
	* as an optional parameter, else it attempts to infer the config by
	* the name of the target pool.
	*
	* Note that the checkpointed state's pool name will be the name of
	* the original pool with the above suffix appended to it. In addition,
	* if the target is not a pool name (e.g. a path to a dataset) then
	* the new_path parameter is populated with the updated path to
	* reflect the fact that we are looking into the checkpointed state.
	*
	* The function returns a newly-allocated copy of the name of the
	* pool containing the checkpointed state. When this copy is no
	* longer needed it should be freed with free(3C). Same thing
	* applies to the new_path parameter if allocated.
	*/
	static char *
	import_checkpointed_state(char target, nvlist_t cfg, char **new_path)
	{
	int error = 0;
	char poolname, bogus_name = NULL;
	boolean_t freecfg = B_FALSE;

	/* If the target is not a pool, the extract the pool name */
	char *path_start = strchr(target, '/');
	if (path_start != NULL) {
	size_t poolname_len = path_start - target;
	poolname = strndup(target, poolname_len);
	} else {
	poolname = target;
	}

	if (cfg == NULL) {
	zdb_set_skip_mmp(poolname);
	error = spa_get_stats(poolname, &cfg, NULL, 0);
	if (error != 0) {
	fatal("Tried to read config of pool \"%s\" but "
	"spa_get_stats() failed with error %d\n",
	poolname, error);
	}
	freecfg = B_TRUE;
	}

	if (asprintf(&bogus_name, "%s%s", poolname, BOGUS_SUFFIX) == -1)
	return (NULL);
	fnvlist_add_string(cfg, ZPOOL_CONFIG_POOL_NAME, bogus_name);

	error = spa_import(bogus_name, cfg, NULL,
	ZFS_IMPORT_MISSING_LOG \| ZFS_IMPORT_CHECKPOINT \|
	ZFS_IMPORT_SKIP_MMP);
	if (freecfg)
	nvlist_free(cfg);
	if (error != 0) {
	fatal("Tried to import pool \"%s\" but spa_import() failed "
	"with error %d\n", bogus_name, error);
	}

	if (new_path != NULL && path_start != NULL) {
	if (asprintf(new_path, "%s%s", bogus_name, path_start) == -1) {
	if (path_start != NULL)
	free(poolname);
	return (NULL);
	}
	}

	if (target != poolname)
	free(poolname);

	return (bogus_name);
	}

	typedef struct verify_checkpoint_sm_entry_cb_arg {
	vdev_t *vcsec_vd;

	/* the following fields are only used for printing progress */
	uint64_t vcsec_entryid;
	uint64_t vcsec_num_entries;
	} verify_checkpoint_sm_entry_cb_arg_t;

	#define ENTRIES_PER_PROGRESS_UPDATE 10000

	static int
	verify_checkpoint_sm_entry_cb(space_map_entry_t sme, void arg)
	{
	verify_checkpoint_sm_entry_cb_arg_t *vcsec = arg;
	vdev_t *vd = vcsec->vcsec_vd;
	metaslab_t *ms = vd->vdev_ms[sme->sme_offset >> vd->vdev_ms_shift];
	uint64_t end = sme->sme_offset + sme->sme_run;

	ASSERT(sme->sme_type == SM_FREE);

	if ((vcsec->vcsec_entryid % ENTRIES_PER_PROGRESS_UPDATE) == 0) {
	(void) fprintf(stderr,
	"\rverifying vdev %llu, space map entry %llu of %llu ...",
	(longlong_t)vd->vdev_id,
	(longlong_t)vcsec->vcsec_entryid,
	(longlong_t)vcsec->vcsec_num_entries);
	}
	vcsec->vcsec_entryid++;

	/*
	* See comment in checkpoint_sm_exclude_entry_cb()
	*/
	VERIFY3U(sme->sme_offset, >=, ms->ms_start);
	VERIFY3U(end, <=, ms->ms_start + ms->ms_size);

	/*
	* The entries in the vdev_checkpoint_sm should be marked as
	* allocated in the checkpointed state of the pool, therefore
	* their respective ms_allocateable trees should not contain them.
	*/
	mutex_enter(&ms->ms_lock);
	range_tree_verify_not_present(ms->ms_allocatable,
	sme->sme_offset, sme->sme_run);
	mutex_exit(&ms->ms_lock);

	return (0);
	}

	/*
	* Verify that all segments in the vdev_checkpoint_sm are allocated
	* according to the checkpoint's ms_sm (i.e. are not in the checkpoint's
	* ms_allocatable).
	*
	* Do so by comparing the checkpoint space maps (vdev_checkpoint_sm) of
	* each vdev in the current state of the pool to the metaslab space maps
	* (ms_sm) of the checkpointed state of the pool.
	*
	* Note that the function changes the state of the ms_allocatable
	* trees of the current spa_t. The entries of these ms_allocatable
	* trees are cleared out and then repopulated from with the free
	* entries of their respective ms_sm space maps.
	*/
	static void
	verify_checkpoint_vdev_spacemaps(spa_t checkpoint, spa_t current)
	{
	vdev_t *ckpoint_rvd = checkpoint->spa_root_vdev;
	vdev_t *current_rvd = current->spa_root_vdev;

	load_concrete_ms_allocatable_trees(checkpoint, SM_FREE);

	for (uint64_t c = 0; c < ckpoint_rvd->vdev_children; c++) {
	vdev_t *ckpoint_vd = ckpoint_rvd->vdev_child[c];
	vdev_t *current_vd = current_rvd->vdev_child[c];

	space_map_t *checkpoint_sm = NULL;
	uint64_t checkpoint_sm_obj;

	if (ckpoint_vd->vdev_ops == &vdev_indirect_ops) {
	/*
	* Since we don't allow device removal in a pool
	* that has a checkpoint, we expect that all removed
	* vdevs were removed from the pool before the
	* checkpoint.
	*/
	ASSERT3P(current_vd->vdev_ops, ==, &vdev_indirect_ops);
	continue;
	}

	/*
	* If the checkpoint space map doesn't exist, then nothing
	* here is checkpointed so there's nothing to verify.
	*/
	if (current_vd->vdev_top_zap == 0 \|\|
	zap_contains(spa_meta_objset(current),
	current_vd->vdev_top_zap,
	VDEV_TOP_ZAP_POOL_CHECKPOINT_SM) != 0)
	continue;

	VERIFY0(zap_lookup(spa_meta_objset(current),
	current_vd->vdev_top_zap, VDEV_TOP_ZAP_POOL_CHECKPOINT_SM,
	sizeof (uint64_t), 1, &checkpoint_sm_obj));

	VERIFY0(space_map_open(&checkpoint_sm, spa_meta_objset(current),
	checkpoint_sm_obj, 0, current_vd->vdev_asize,
	current_vd->vdev_ashift));

	verify_checkpoint_sm_entry_cb_arg_t vcsec;
	vcsec.vcsec_vd = ckpoint_vd;
	vcsec.vcsec_entryid = 0;
	vcsec.vcsec_num_entries =
	space_map_length(checkpoint_sm) / sizeof (uint64_t);
	VERIFY0(space_map_iterate(checkpoint_sm,
	space_map_length(checkpoint_sm),
	verify_checkpoint_sm_entry_cb, &vcsec));
	if (dump_opt['m'] > 3)
	dump_spacemap(current->spa_meta_objset, checkpoint_sm);
	space_map_close(checkpoint_sm);
	}

	/*
	* If we've added vdevs since we took the checkpoint, ensure
	* that their checkpoint space maps are empty.
	*/
	if (ckpoint_rvd->vdev_children < current_rvd->vdev_children) {
	for (uint64_t c = ckpoint_rvd->vdev_children;
	c < current_rvd->vdev_children; c++) {
	vdev_t *current_vd = current_rvd->vdev_child[c];
	VERIFY3P(current_vd->vdev_checkpoint_sm, ==, NULL);
	}
	}

	/* for cleaner progress output */
	(void) fprintf(stderr, "\n");
	}

	/*
	* Verifies that all space that's allocated in the checkpoint is
	* still allocated in the current version, by checking that everything
	* in checkpoint's ms_allocatable (which is actually allocated, not
	* allocatable/free) is not present in current's ms_allocatable.
	*
	* Note that the function changes the state of the ms_allocatable
	* trees of both spas when called. The entries of all ms_allocatable
	* trees are cleared out and then repopulated from their respective
	* ms_sm space maps. In the checkpointed state we load the allocated
	* entries, and in the current state we load the free entries.
	*/
	static void
	verify_checkpoint_ms_spacemaps(spa_t checkpoint, spa_t current)
	{
	vdev_t *ckpoint_rvd = checkpoint->spa_root_vdev;
	vdev_t *current_rvd = current->spa_root_vdev;

	load_concrete_ms_allocatable_trees(checkpoint, SM_ALLOC);
	load_concrete_ms_allocatable_trees(current, SM_FREE);

	for (uint64_t i = 0; i < ckpoint_rvd->vdev_children; i++) {
	vdev_t *ckpoint_vd = ckpoint_rvd->vdev_child[i];
	vdev_t *current_vd = current_rvd->vdev_child[i];

	if (ckpoint_vd->vdev_ops == &vdev_indirect_ops) {
	/*
	* See comment in verify_checkpoint_vdev_spacemaps()
	*/
	ASSERT3P(current_vd->vdev_ops, ==, &vdev_indirect_ops);
	continue;
	}

	for (uint64_t m = 0; m < ckpoint_vd->vdev_ms_count; m++) {
	metaslab_t *ckpoint_msp = ckpoint_vd->vdev_ms[m];
	metaslab_t *current_msp = current_vd->vdev_ms[m];

	(void) fprintf(stderr,
	"\rverifying vdev %llu of %llu, "
	"metaslab %llu of %llu ...",
	(longlong_t)current_vd->vdev_id,
	(longlong_t)current_rvd->vdev_children,
	(longlong_t)current_vd->vdev_ms[m]->ms_id,
	(longlong_t)current_vd->vdev_ms_count);

	/*
	* We walk through the ms_allocatable trees that
	* are loaded with the allocated blocks from the
	* ms_sm spacemaps of the checkpoint. For each
	* one of these ranges we ensure that none of them
	* exists in the ms_allocatable trees of the
	* current state which are loaded with the ranges
	* that are currently free.
	*
	* This way we ensure that none of the blocks that
	* are part of the checkpoint were freed by mistake.
	*/
	range_tree_walk(ckpoint_msp->ms_allocatable,
	(range_tree_func_t *)range_tree_verify_not_present,
	current_msp->ms_allocatable);
	}
	}

	/* for cleaner progress output */
	(void) fprintf(stderr, "\n");
	}

	static void
	verify_checkpoint_blocks(spa_t *spa)
	{
	ASSERT(!dump_opt['L']);

	spa_t *checkpoint_spa;
	char *checkpoint_pool;
	int error = 0;

	/*
	* We import the checkpointed state of the pool (under a different
	* name) so we can do verification on it against the current state
	* of the pool.
	*/
	checkpoint_pool = import_checkpointed_state(spa->spa_name, NULL,
	NULL);
	ASSERT(strcmp(spa->spa_name, checkpoint_pool) != 0);

	error = spa_open(checkpoint_pool, &checkpoint_spa, FTAG);
	if (error != 0) {
	fatal("Tried to open pool \"%s\" but spa_open() failed with "
	"error %d\n", checkpoint_pool, error);
	}

	/*
	* Ensure that ranges in the checkpoint space maps of each vdev
	* are allocated according to the checkpointed state's metaslab
	* space maps.
	*/
	verify_checkpoint_vdev_spacemaps(checkpoint_spa, spa);

	/*
	* Ensure that allocated ranges in the checkpoint's metaslab
	* space maps remain allocated in the metaslab space maps of
	* the current state.
	*/
	verify_checkpoint_ms_spacemaps(checkpoint_spa, spa);

	/*
	* Once we are done, we get rid of the checkpointed state.
	*/
	spa_close(checkpoint_spa, FTAG);
	free(checkpoint_pool);
	}

	static void
	dump_leftover_checkpoint_blocks(spa_t *spa)
	{
	vdev_t *rvd = spa->spa_root_vdev;

	for (uint64_t i = 0; i < rvd->vdev_children; i++) {
	vdev_t *vd = rvd->vdev_child[i];

	space_map_t *checkpoint_sm = NULL;
	uint64_t checkpoint_sm_obj;

	if (vd->vdev_top_zap == 0)
	continue;

	if (zap_contains(spa_meta_objset(spa), vd->vdev_top_zap,
	VDEV_TOP_ZAP_POOL_CHECKPOINT_SM) != 0)
	continue;

	VERIFY0(zap_lookup(spa_meta_objset(spa), vd->vdev_top_zap,
	VDEV_TOP_ZAP_POOL_CHECKPOINT_SM,
	sizeof (uint64_t), 1, &checkpoint_sm_obj));

	VERIFY0(space_map_open(&checkpoint_sm, spa_meta_objset(spa),
	checkpoint_sm_obj, 0, vd->vdev_asize, vd->vdev_ashift));
	dump_spacemap(spa->spa_meta_objset, checkpoint_sm);
	space_map_close(checkpoint_sm);
	}
	}

	static int
	verify_checkpoint(spa_t *spa)
	{
	uberblock_t checkpoint;
	int error;

	if (!spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT))
	return (0);

	error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t),
	sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint);

	if (error == ENOENT && !dump_opt['L']) {
	/*
	* If the feature is active but the uberblock is missing
	* then we must be in the middle of discarding the
	* checkpoint.
	*/
	(void) printf("\nPartially discarded checkpoint "
	"state found:\n");
	if (dump_opt['m'] > 3)
	dump_leftover_checkpoint_blocks(spa);
	return (0);
	} else if (error != 0) {
	(void) printf("lookup error %d when looking for "
	"checkpointed uberblock in MOS\n", error);
	return (error);
	}
	dump_uberblock(&checkpoint, "\nCheckpointed uberblock found:\n", "\n");

	if (checkpoint.ub_checkpoint_txg == 0) {
	(void) printf("\nub_checkpoint_txg not set in checkpointed "
	"uberblock\n");
	error = 3;
	}

	if (error == 0 && !dump_opt['L'])
	verify_checkpoint_blocks(spa);

	return (error);
	}

	/* ARGSUSED */
	static void
	mos_leaks_cb(void *arg, uint64_t start, uint64_t size)
	{
	for (uint64_t i = start; i < size; i++) {
	(void) printf("MOS object %llu referenced but not allocated\n",
	(u_longlong_t)i);
	}
	}

	static void
	mos_obj_refd(uint64_t obj)
	{
	if (obj != 0 && mos_refd_objs != NULL)
	range_tree_add(mos_refd_objs, obj, 1);
	}

	/*
	* Call on a MOS object that may already have been referenced.
	*/
	static void
	mos_obj_refd_multiple(uint64_t obj)
	{
	if (obj != 0 && mos_refd_objs != NULL &&
	!range_tree_contains(mos_refd_objs, obj, 1))
	range_tree_add(mos_refd_objs, obj, 1);
	}

	static void
	mos_leak_vdev_top_zap(vdev_t *vd)
	{
	uint64_t ms_flush_data_obj;
	int error = zap_lookup(spa_meta_objset(vd->vdev_spa),
	vd->vdev_top_zap, VDEV_TOP_ZAP_MS_UNFLUSHED_PHYS_TXGS,
	sizeof (ms_flush_data_obj), 1, &ms_flush_data_obj);
	if (error == ENOENT)
	return;
	ASSERT0(error);

	mos_obj_refd(ms_flush_data_obj);
	}

	static void
	mos_leak_vdev(vdev_t *vd)
	{
	mos_obj_refd(vd->vdev_dtl_object);
	mos_obj_refd(vd->vdev_ms_array);
	mos_obj_refd(vd->vdev_indirect_config.vic_births_object);
	mos_obj_refd(vd->vdev_indirect_config.vic_mapping_object);
	mos_obj_refd(vd->vdev_leaf_zap);
	if (vd->vdev_checkpoint_sm != NULL)
	mos_obj_refd(vd->vdev_checkpoint_sm->sm_object);
	if (vd->vdev_indirect_mapping != NULL) {
	mos_obj_refd(vd->vdev_indirect_mapping->
	vim_phys->vimp_counts_object);
	}
	if (vd->vdev_obsolete_sm != NULL)
	mos_obj_refd(vd->vdev_obsolete_sm->sm_object);

	for (uint64_t m = 0; m < vd->vdev_ms_count; m++) {
	metaslab_t *ms = vd->vdev_ms[m];
	mos_obj_refd(space_map_object(ms->ms_sm));
	}

	if (vd->vdev_top_zap != 0) {
	mos_obj_refd(vd->vdev_top_zap);
	mos_leak_vdev_top_zap(vd);
	}

	for (uint64_t c = 0; c < vd->vdev_children; c++) {
	mos_leak_vdev(vd->vdev_child[c]);
	}
	}

	static void
	mos_leak_log_spacemaps(spa_t *spa)
	{
	uint64_t spacemap_zap;
	int error = zap_lookup(spa_meta_objset(spa),
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_LOG_SPACEMAP_ZAP,
	sizeof (spacemap_zap), 1, &spacemap_zap);
	if (error == ENOENT)
	return;
	ASSERT0(error);

	mos_obj_refd(spacemap_zap);
	for (spa_log_sm_t *sls = avl_first(&spa->spa_sm_logs_by_txg);
	sls; sls = AVL_NEXT(&spa->spa_sm_logs_by_txg, sls))
	mos_obj_refd(sls->sls_sm_obj);
	}

	static int
	dump_mos_leaks(spa_t *spa)
	{
	int rv = 0;
	objset_t *mos = spa->spa_meta_objset;
	dsl_pool_t *dp = spa->spa_dsl_pool;

	/* Visit and mark all referenced objects in the MOS */

	mos_obj_refd(DMU_POOL_DIRECTORY_OBJECT);
	mos_obj_refd(spa->spa_pool_props_object);
	mos_obj_refd(spa->spa_config_object);
	mos_obj_refd(spa->spa_ddt_stat_object);
	mos_obj_refd(spa->spa_feat_desc_obj);
	mos_obj_refd(spa->spa_feat_enabled_txg_obj);
	mos_obj_refd(spa->spa_feat_for_read_obj);
	mos_obj_refd(spa->spa_feat_for_write_obj);
	mos_obj_refd(spa->spa_history);
	mos_obj_refd(spa->spa_errlog_last);
	mos_obj_refd(spa->spa_errlog_scrub);
	mos_obj_refd(spa->spa_all_vdev_zaps);
	mos_obj_refd(spa->spa_dsl_pool->dp_bptree_obj);
	mos_obj_refd(spa->spa_dsl_pool->dp_tmp_userrefs_obj);
	mos_obj_refd(spa->spa_dsl_pool->dp_scan->scn_phys.scn_queue_obj);
	bpobj_count_refd(&spa->spa_deferred_bpobj);
	mos_obj_refd(dp->dp_empty_bpobj);
	bpobj_count_refd(&dp->dp_obsolete_bpobj);
	bpobj_count_refd(&dp->dp_free_bpobj);
	mos_obj_refd(spa->spa_l2cache.sav_object);
	mos_obj_refd(spa->spa_spares.sav_object);

	if (spa->spa_syncing_log_sm != NULL)
	mos_obj_refd(spa->spa_syncing_log_sm->sm_object);
	mos_leak_log_spacemaps(spa);

	mos_obj_refd(spa->spa_condensing_indirect_phys.
	scip_next_mapping_object);
	mos_obj_refd(spa->spa_condensing_indirect_phys.
	scip_prev_obsolete_sm_object);
	if (spa->spa_condensing_indirect_phys.scip_next_mapping_object != 0) {
	vdev_indirect_mapping_t *vim =
	vdev_indirect_mapping_open(mos,
	spa->spa_condensing_indirect_phys.scip_next_mapping_object);
	mos_obj_refd(vim->vim_phys->vimp_counts_object);
	vdev_indirect_mapping_close(vim);
	}
	deleted_livelists_dump_mos(spa);

	if (dp->dp_origin_snap != NULL) {
	dsl_dataset_t *ds;

	dsl_pool_config_enter(dp, FTAG);
	VERIFY0(dsl_dataset_hold_obj(dp,
	dsl_dataset_phys(dp->dp_origin_snap)->ds_next_snap_obj,
	FTAG, &ds));
	count_ds_mos_objects(ds);
	dump_blkptr_list(&ds->ds_deadlist, "Deadlist");
	dsl_dataset_rele(ds, FTAG);
	dsl_pool_config_exit(dp, FTAG);

	count_ds_mos_objects(dp->dp_origin_snap);
	dump_blkptr_list(&dp->dp_origin_snap->ds_deadlist, "Deadlist");
	}
	count_dir_mos_objects(dp->dp_mos_dir);
	if (dp->dp_free_dir != NULL)
	count_dir_mos_objects(dp->dp_free_dir);
	if (dp->dp_leak_dir != NULL)
	count_dir_mos_objects(dp->dp_leak_dir);

	mos_leak_vdev(spa->spa_root_vdev);

	for (uint64_t class = 0; class < DDT_CLASSES; class++) {
	for (uint64_t type = 0; type < DDT_TYPES; type++) {
	for (uint64_t cksum = 0;
	cksum < ZIO_CHECKSUM_FUNCTIONS; cksum++) {
	ddt_t *ddt = spa->spa_ddt[cksum];
	mos_obj_refd(ddt->ddt_object[type][class]);
	}
	}
	}

	/*
	* Visit all allocated objects and make sure they are referenced.
	*/
	uint64_t object = 0;
	while (dmu_object_next(mos, &object, B_FALSE, 0) == 0) {
	if (range_tree_contains(mos_refd_objs, object, 1)) {
	range_tree_remove(mos_refd_objs, object, 1);
	} else {
	dmu_object_info_t doi;
	const char *name;
	dmu_object_info(mos, object, &doi);
	if (doi.doi_type & DMU_OT_NEWTYPE) {
	dmu_object_byteswap_t bswap =
	DMU_OT_BYTESWAP(doi.doi_type);
	name = dmu_ot_byteswap[bswap].ob_name;
	} else {
	name = dmu_ot[doi.doi_type].ot_name;
	}

	(void) printf("MOS object %llu (%s) leaked\n",
	(u_longlong_t)object, name);
	rv = 2;
	}
	}
	(void) range_tree_walk(mos_refd_objs, mos_leaks_cb, NULL);
	if (!range_tree_is_empty(mos_refd_objs))
	rv = 2;
	range_tree_vacate(mos_refd_objs, NULL, NULL);
	range_tree_destroy(mos_refd_objs);
	return (rv);
	}

	typedef struct log_sm_obsolete_stats_arg {
	uint64_t lsos_current_txg;

	uint64_t lsos_total_entries;
	uint64_t lsos_valid_entries;

	uint64_t lsos_sm_entries;
	uint64_t lsos_valid_sm_entries;
	} log_sm_obsolete_stats_arg_t;

	static int
	log_spacemap_obsolete_stats_cb(spa_t spa, space_map_entry_t sme,
	uint64_t txg, void *arg)
	{
	log_sm_obsolete_stats_arg_t *lsos = arg;

	uint64_t offset = sme->sme_offset;
	uint64_t vdev_id = sme->sme_vdev;

	if (lsos->lsos_current_txg == 0) {
	/* this is the first log */
	lsos->lsos_current_txg = txg;
	} else if (lsos->lsos_current_txg < txg) {
	/* we just changed log - print stats and reset */
	(void) printf("%-8llu valid entries out of %-8llu - txg %llu\n",
	(u_longlong_t)lsos->lsos_valid_sm_entries,
	(u_longlong_t)lsos->lsos_sm_entries,
	(u_longlong_t)lsos->lsos_current_txg);
	lsos->lsos_valid_sm_entries = 0;
	lsos->lsos_sm_entries = 0;
	lsos->lsos_current_txg = txg;
	}
	ASSERT3U(lsos->lsos_current_txg, ==, txg);

	lsos->lsos_sm_entries++;
	lsos->lsos_total_entries++;

	vdev_t *vd = vdev_lookup_top(spa, vdev_id);
	if (!vdev_is_concrete(vd))
	return (0);

	metaslab_t *ms = vd->vdev_ms[offset >> vd->vdev_ms_shift];
	ASSERT(sme->sme_type == SM_ALLOC \|\| sme->sme_type == SM_FREE);

	if (txg < metaslab_unflushed_txg(ms))
	return (0);
	lsos->lsos_valid_sm_entries++;
	lsos->lsos_valid_entries++;
	return (0);
	}

	static void
	dump_log_spacemap_obsolete_stats(spa_t *spa)
	{
	if (!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))
	return;

	log_sm_obsolete_stats_arg_t lsos;
	bzero(&lsos, sizeof (lsos));

	(void) printf("Log Space Map Obsolete Entry Statistics:\n");

	iterate_through_spacemap_logs(spa,
	log_spacemap_obsolete_stats_cb, &lsos);

	/* print stats for latest log */
	(void) printf("%-8llu valid entries out of %-8llu - txg %llu\n",
	(u_longlong_t)lsos.lsos_valid_sm_entries,
	(u_longlong_t)lsos.lsos_sm_entries,
	(u_longlong_t)lsos.lsos_current_txg);

	(void) printf("%-8llu valid entries out of %-8llu - total\n\n",
	(u_longlong_t)lsos.lsos_valid_entries,
	(u_longlong_t)lsos.lsos_total_entries);
	}

	static void
	dump_zpool(spa_t *spa)
	{
	dsl_pool_t *dp = spa_get_dsl(spa);
	int rc = 0;

	if (dump_opt['y']) {
	livelist_metaslab_validate(spa);
	}

	if (dump_opt['S']) {
	dump_simulated_ddt(spa);
	return;
	}

	if (!dump_opt['e'] && dump_opt['C'] > 1) {
	(void) printf("\nCached configuration:\n");
	dump_nvlist(spa->spa_config, 8);
	}

	if (dump_opt['C'])
	dump_config(spa);

	if (dump_opt['u'])
	dump_uberblock(&spa->spa_uberblock, "\nUberblock:\n", "\n");

	if (dump_opt['D'])
	dump_all_ddts(spa);

	if (dump_opt['d'] > 2 \|\| dump_opt['m'])
	dump_metaslabs(spa);
	if (dump_opt['M'])
	dump_metaslab_groups(spa);
	if (dump_opt['d'] > 2 \|\| dump_opt['m']) {
	dump_log_spacemaps(spa);
	dump_log_spacemap_obsolete_stats(spa);
	}

	if (dump_opt['d'] \|\| dump_opt['i']) {
	spa_feature_t f;
	mos_refd_objs = range_tree_create(NULL, RANGE_SEG64, NULL, 0,
	0);
	dump_objset(dp->dp_meta_objset);

	if (dump_opt['d'] >= 3) {
	dsl_pool_t *dp = spa->spa_dsl_pool;
	dump_full_bpobj(&spa->spa_deferred_bpobj,
	"Deferred frees", 0);
	if (spa_version(spa) >= SPA_VERSION_DEADLISTS) {
	dump_full_bpobj(&dp->dp_free_bpobj,
	"Pool snapshot frees", 0);
	}
	if (bpobj_is_open(&dp->dp_obsolete_bpobj)) {
	ASSERT(spa_feature_is_enabled(spa,
	SPA_FEATURE_DEVICE_REMOVAL));
	dump_full_bpobj(&dp->dp_obsolete_bpobj,
	"Pool obsolete blocks", 0);
	}

	if (spa_feature_is_active(spa,
	SPA_FEATURE_ASYNC_DESTROY)) {
	dump_bptree(spa->spa_meta_objset,
	dp->dp_bptree_obj,
	"Pool dataset frees");
	}
	dump_dtl(spa->spa_root_vdev, 0);
	}

	for (spa_feature_t f = 0; f < SPA_FEATURES; f++)
	global_feature_count[f] = UINT64_MAX;
	global_feature_count[SPA_FEATURE_REDACTION_BOOKMARKS] = 0;
	global_feature_count[SPA_FEATURE_BOOKMARK_WRITTEN] = 0;
	global_feature_count[SPA_FEATURE_LIVELIST] = 0;

	(void) dmu_objset_find(spa_name(spa), dump_one_objset,
	NULL, DS_FIND_SNAPSHOTS \| DS_FIND_CHILDREN);

	if (rc == 0 && !dump_opt['L'])
	rc = dump_mos_leaks(spa);

	for (f = 0; f < SPA_FEATURES; f++) {
	uint64_t refcount;

	uint64_t *arr;
	if (!(spa_feature_table[f].fi_flags &
	ZFEATURE_FLAG_PER_DATASET)) {
	if (global_feature_count[f] == UINT64_MAX)
	continue;
	if (!spa_feature_is_enabled(spa, f)) {
	ASSERT0(global_feature_count[f]);
	continue;
	}
	arr = global_feature_count;
	} else {
	if (!spa_feature_is_enabled(spa, f)) {
	ASSERT0(dataset_feature_count[f]);
	continue;
	}
	arr = dataset_feature_count;
	}
	if (feature_get_refcount(spa, &spa_feature_table[f],
	&refcount) == ENOTSUP)
	continue;
	if (arr[f] != refcount) {
	(void) printf("%s feature refcount mismatch: "
	"%lld consumers != %lld refcount\n",
	spa_feature_table[f].fi_uname,
	(longlong_t)arr[f], (longlong_t)refcount);
	rc = 2;
	} else {
	(void) printf("Verified %s feature refcount "
	"of %llu is correct\n",
	spa_feature_table[f].fi_uname,
	(longlong_t)refcount);
	}
	}

	if (rc == 0)
	rc = verify_device_removal_feature_counts(spa);
	}

	if (rc == 0 && (dump_opt['b'] \|\| dump_opt['c']))
	rc = dump_block_stats(spa);

	if (rc == 0)
	rc = verify_spacemap_refcounts(spa);

	if (dump_opt['s'])
	show_pool_stats(spa);

	if (dump_opt['h'])
	dump_history(spa);

	if (rc == 0)
	rc = verify_checkpoint(spa);

	if (rc != 0) {
	dump_debug_buffer();
	exit(rc);
	}
	}

	#define ZDB_FLAG_CHECKSUM 0x0001
	#define ZDB_FLAG_DECOMPRESS 0x0002
	#define ZDB_FLAG_BSWAP 0x0004
	#define ZDB_FLAG_GBH 0x0008
	#define ZDB_FLAG_INDIRECT 0x0010
	#define ZDB_FLAG_RAW 0x0020
	#define ZDB_FLAG_PRINT_BLKPTR 0x0040
	#define ZDB_FLAG_VERBOSE 0x0080

	static int flagbits[256];
	static char flagbitstr[16];

	static void
	zdb_print_blkptr(const blkptr_t *bp, int flags)
	{
	char blkbuf[BP_SPRINTF_LEN];

	if (flags & ZDB_FLAG_BSWAP)
	byteswap_uint64_array((void *)bp, sizeof (blkptr_t));

	snprintf_blkptr(blkbuf, sizeof (blkbuf), bp);
	(void) printf("%s\n", blkbuf);
	}

	static void
	zdb_dump_indirect(blkptr_t *bp, int nbps, int flags)
	{
	int i;

	for (i = 0; i < nbps; i++)
	zdb_print_blkptr(&bp[i], flags);
	}

	static void
	zdb_dump_gbh(void *buf, int flags)
	{
	zdb_dump_indirect((blkptr_t *)buf, SPA_GBH_NBLKPTRS, flags);
	}

	static void
	zdb_dump_block_raw(void *buf, uint64_t size, int flags)
	{
	if (flags & ZDB_FLAG_BSWAP)
	byteswap_uint64_array(buf, size);
	VERIFY(write(fileno(stdout), buf, size) == size);
	}

	static void
	zdb_dump_block(char label, void buf, uint64_t size, int flags)
	{
	uint64_t d = (uint64_t )buf;
	unsigned nwords = size / sizeof (uint64_t);
	int do_bswap = !!(flags & ZDB_FLAG_BSWAP);
	unsigned i, j;
	const char *hdr;
	char *c;


	if (do_bswap)
	hdr = " 7 6 5 4 3 2 1 0 f e d c b a 9 8";
	else
	hdr = " 0 1 2 3 4 5 6 7 8 9 a b c d e f";

	(void) printf("\n%s\n%6s %s 0123456789abcdef\n", label, "", hdr);

	#ifdef _LITTLE_ENDIAN
	/* correct the endianness */
	do_bswap = !do_bswap;
	#endif
	for (i = 0; i < nwords; i += 2) {
	(void) printf("%06llx: %016llx %016llx ",
	(u_longlong_t)(i * sizeof (uint64_t)),
	(u_longlong_t)(do_bswap ? BSWAP_64(d[i]) : d[i]),
	(u_longlong_t)(do_bswap ? BSWAP_64(d[i + 1]) : d[i + 1]));

	c = (char *)&d[i];
	for (j = 0; j < 2 * sizeof (uint64_t); j++)
	(void) printf("%c", isprint(c[j]) ? c[j] : '.');
	(void) printf("\n");
	}
	}

	/*
	* There are two acceptable formats:
	* leaf_name - For example: c1t0d0 or /tmp/ztest.0a
	* child[.child]* - For example: 0.1.1
	*
	* The second form can be used to specify arbitrary vdevs anywhere
	* in the hierarchy. For example, in a pool with a mirror of
	* RAID-Zs, you can specify either RAID-Z vdev with 0.0 or 0.1 .
	*/
	static vdev_t *
	zdb_vdev_lookup(vdev_t vdev, const char path)
	{
	char s, p, *q;
	unsigned i;

	if (vdev == NULL)
	return (NULL);

	/* First, assume the x.x.x.x format */
	i = strtoul(path, &s, 10);
	if (s == path \|\| (s && s != '.' && s != '\0'))
	goto name;
	if (i >= vdev->vdev_children)
	return (NULL);

	vdev = vdev->vdev_child[i];
	if (s && *s == '\0')
	return (vdev);
	return (zdb_vdev_lookup(vdev, s+1));

	name:
	for (i = 0; i < vdev->vdev_children; i++) {
	vdev_t *vc = vdev->vdev_child[i];

	if (vc->vdev_path == NULL) {
	vc = zdb_vdev_lookup(vc, path);
	if (vc == NULL)
	continue;
	else
	return (vc);
	}

	p = strrchr(vc->vdev_path, '/');
	p = p ? p + 1 : vc->vdev_path;
	q = &vc->vdev_path[strlen(vc->vdev_path) - 2];

	if (strcmp(vc->vdev_path, path) == 0)
	return (vc);
	if (strcmp(p, path) == 0)
	return (vc);
	if (strcmp(q, "s0") == 0 && strncmp(p, path, q - p) == 0)
	return (vc);
	}

	return (NULL);
	}

	static int
	name_from_objset_id(spa_t spa, uint64_t objset_id, char outstr)
	{
	dsl_dataset_t *ds;

	dsl_pool_config_enter(spa->spa_dsl_pool, FTAG);
	int error = dsl_dataset_hold_obj(spa->spa_dsl_pool, objset_id,
	NULL, &ds);
	if (error != 0) {
	(void) fprintf(stderr, "failed to hold objset %llu: %s\n",
	(u_longlong_t)objset_id, strerror(error));
	dsl_pool_config_exit(spa->spa_dsl_pool, FTAG);
	return (error);
	}
	dsl_dataset_name(ds, outstr);
	dsl_dataset_rele(ds, NULL);
	dsl_pool_config_exit(spa->spa_dsl_pool, FTAG);
	return (0);
	}

	static boolean_t
	zdb_parse_block_sizes(char sizes, uint64_t lsize, uint64_t *psize)
	{
	char s0, s1;

	if (sizes == NULL)
	return (B_FALSE);

	s0 = strtok(sizes, "/");
	if (s0 == NULL)
	return (B_FALSE);
	s1 = strtok(NULL, "/");
	*lsize = strtoull(s0, NULL, 16);
	psize = s1 ? strtoull(s1, NULL, 16) : lsize;
	return (lsize >= psize && *psize > 0);
	}

	#define ZIO_COMPRESS_MASK(alg) (1ULL << (ZIO_COMPRESS_##alg))

	static boolean_t
	zdb_decompress_block(abd_t pabd, void buf, void *lbuf, uint64_t lsize,
	uint64_t psize, int flags)
	{
	boolean_t exceeded = B_FALSE;
	/*
	* We don't know how the data was compressed, so just try
	* every decompress function at every inflated blocksize.
	*/
	void *lbuf2 = umem_alloc(SPA_MAXBLOCKSIZE, UMEM_NOFAIL);
	int cfuncs[ZIO_COMPRESS_FUNCTIONS] = { 0 };
	int *cfuncp = cfuncs;
	uint64_t maxlsize = SPA_MAXBLOCKSIZE;
	uint64_t mask = ZIO_COMPRESS_MASK(ON) \| ZIO_COMPRESS_MASK(OFF) \|
	ZIO_COMPRESS_MASK(INHERIT) \| ZIO_COMPRESS_MASK(EMPTY) \|
	(getenv("ZDB_NO_ZLE") ? ZIO_COMPRESS_MASK(ZLE) : 0);
	*cfuncp++ = ZIO_COMPRESS_LZ4;
	*cfuncp++ = ZIO_COMPRESS_LZJB;
	mask \|= ZIO_COMPRESS_MASK(LZ4) \| ZIO_COMPRESS_MASK(LZJB);
	for (int c = 0; c < ZIO_COMPRESS_FUNCTIONS; c++)
	if (((1ULL << c) & mask) == 0)
	*cfuncp++ = c;

	/*
	* On the one hand, with SPA_MAXBLOCKSIZE at 16MB, this
	* could take a while and we should let the user know
	* we are not stuck. On the other hand, printing progress
	* info gets old after a while. User can specify 'v' flag
	* to see the progression.
	*/
	if (lsize == psize)
	lsize += SPA_MINBLOCKSIZE;
	else
	maxlsize = lsize;
	for (; lsize <= maxlsize; lsize += SPA_MINBLOCKSIZE) {
	for (cfuncp = cfuncs; *cfuncp; cfuncp++) {
	if (flags & ZDB_FLAG_VERBOSE) {
	(void) fprintf(stderr,
	"Trying %05llx -> %05llx (%s)\n",
	(u_longlong_t)psize,
	(u_longlong_t)lsize,
	zio_compress_table[*cfuncp].\
	ci_name);
	}

	/*
	* We randomize lbuf2, and decompress to both
	* lbuf and lbuf2. This way, we will know if
	* decompression fill exactly to lsize.
	*/
	VERIFY0(random_get_pseudo_bytes(lbuf2, lsize));

	if (zio_decompress_data(*cfuncp, pabd,
	lbuf, psize, lsize, NULL) == 0 &&
	zio_decompress_data(*cfuncp, pabd,
	lbuf2, psize, lsize, NULL) == 0 &&
	bcmp(lbuf, lbuf2, lsize) == 0)
	break;
	}
	if (*cfuncp != 0)
	break;
	}
	umem_free(lbuf2, SPA_MAXBLOCKSIZE);

	if (lsize > maxlsize) {
	exceeded = B_TRUE;
	}
	buf = lbuf;
	if (*cfuncp == ZIO_COMPRESS_ZLE) {
	printf("\nZLE decompression was selected. If you "
	"suspect the results are wrong,\ntry avoiding ZLE "
	"by setting and exporting ZDB_NO_ZLE=\"true\"\n");
	}

	return (exceeded);
	}

	/*
	* Read a block from a pool and print it out. The syntax of the
	* block descriptor is:
	*
	* pool:vdev_specifier:offset:[lsize/]psize[:flags]
	*
	* pool - The name of the pool you wish to read from
	* vdev_specifier - Which vdev (see comment for zdb_vdev_lookup)
	* offset - offset, in hex, in bytes
	* size - Amount of data to read, in hex, in bytes
	* flags - A string of characters specifying options
	* b: Decode a blkptr at given offset within block
	* c: Calculate and display checksums
	* d: Decompress data before dumping
	* e: Byteswap data before dumping
	* g: Display data as a gang block header
	* i: Display as an indirect block
	* r: Dump raw data to stdout
	* v: Verbose
	*
	*/
	static void
	zdb_read_block(char thing, spa_t spa)
	{
	blkptr_t blk, *bp = &blk;
	dva_t *dva = bp->blk_dva;
	int flags = 0;
	uint64_t offset = 0, psize = 0, lsize = 0, blkptr_offset = 0;
	zio_t *zio;
	vdev_t *vd;
	abd_t *pabd;
	void lbuf, buf;
	char s, p, dup, vdev, flagstr, sizes;
	int i, error;
	boolean_t borrowed = B_FALSE, found = B_FALSE;

	dup = strdup(thing);
	s = strtok(dup, ":");
	vdev = s ? s : "";
	s = strtok(NULL, ":");
	offset = strtoull(s ? s : "", NULL, 16);
	sizes = strtok(NULL, ":");
	s = strtok(NULL, ":");
	flagstr = strdup(s ? s : "");

	s = NULL;
	if (!zdb_parse_block_sizes(sizes, &lsize, &psize))
	s = "invalid size(s)";
	if (!IS_P2ALIGNED(psize, DEV_BSIZE) \|\| !IS_P2ALIGNED(lsize, DEV_BSIZE))
	s = "size must be a multiple of sector size";
	if (!IS_P2ALIGNED(offset, DEV_BSIZE))
	s = "offset must be a multiple of sector size";
	if (s) {
	(void) printf("Invalid block specifier: %s - %s\n", thing, s);
	goto done;
	}

	for (s = strtok(flagstr, ":"); s; s = strtok(NULL, ":")) {
	for (i = 0; i < strlen(flagstr); i++) {
	int bit = flagbits[(uchar_t)flagstr[i]];

	if (bit == 0) {
	(void) printf("***Ignoring flag: %c\n",
	(uchar_t)flagstr[i]);
	continue;
	}
	found = B_TRUE;
	flags \|= bit;

	p = &flagstr[i + 1];
	if (p != ':' && p != '\0') {
	int j = 0, nextbit = flagbits[(uchar_t)*p];
	char *end, offstr[8] = { 0 };
	if ((bit == ZDB_FLAG_PRINT_BLKPTR) &&
	(nextbit == 0)) {
	/* look ahead to isolate the offset */
	while (nextbit == 0 &&
	strchr(flagbitstr, *p) == NULL) {
	offstr[j] = *p;
	j++;
	if (i + j > strlen(flagstr))
	break;
	p++;
	nextbit = flagbits[(uchar_t)*p];
	}
	blkptr_offset = strtoull(offstr, &end,
	16);
	i += j;
	} else if (nextbit == 0) {
	(void) printf("***Ignoring flag arg:"
	" '%c'\n", (uchar_t)*p);
	}
	}
	}
	}
	if (blkptr_offset % sizeof (blkptr_t)) {
	printf("Block pointer offset 0x%llx "
	"must be divisible by 0x%x\n",
	(longlong_t)blkptr_offset, (int)sizeof (blkptr_t));
	goto done;
	}
	if (found == B_FALSE && strlen(flagstr) > 0) {
	printf("Invalid flag arg: '%s'\n", flagstr);
	goto done;
	}

	vd = zdb_vdev_lookup(spa->spa_root_vdev, vdev);
	if (vd == NULL) {
	(void) printf("***Invalid vdev: %s\n", vdev);
	free(dup);
	return;
	} else {
	if (vd->vdev_path)
	(void) fprintf(stderr, "Found vdev: %s\n",
	vd->vdev_path);
	else
	(void) fprintf(stderr, "Found vdev type: %s\n",
	vd->vdev_ops->vdev_op_type);
	}

	pabd = abd_alloc_for_io(SPA_MAXBLOCKSIZE, B_FALSE);
	lbuf = umem_alloc(SPA_MAXBLOCKSIZE, UMEM_NOFAIL);

	BP_ZERO(bp);

	DVA_SET_VDEV(&dva[0], vd->vdev_id);
	DVA_SET_OFFSET(&dva[0], offset);
	DVA_SET_GANG(&dva[0], !!(flags & ZDB_FLAG_GBH));
	DVA_SET_ASIZE(&dva[0], vdev_psize_to_asize(vd, psize));

	BP_SET_BIRTH(bp, TXG_INITIAL, TXG_INITIAL);

	BP_SET_LSIZE(bp, lsize);
	BP_SET_PSIZE(bp, psize);
	BP_SET_COMPRESS(bp, ZIO_COMPRESS_OFF);
	BP_SET_CHECKSUM(bp, ZIO_CHECKSUM_OFF);
	BP_SET_TYPE(bp, DMU_OT_NONE);
	BP_SET_LEVEL(bp, 0);
	BP_SET_DEDUP(bp, 0);
	BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);

	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
	zio = zio_root(spa, NULL, NULL, 0);

	if (vd == vd->vdev_top) {
	/*
	* Treat this as a normal block read.
	*/
	zio_nowait(zio_read(zio, spa, bp, pabd, psize, NULL, NULL,
	ZIO_PRIORITY_SYNC_READ,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_RAW, NULL));
	} else {
	/*
	* Treat this as a vdev child I/O.
	*/
	zio_nowait(zio_vdev_child_io(zio, bp, vd, offset, pabd,
	psize, ZIO_TYPE_READ, ZIO_PRIORITY_SYNC_READ,
	ZIO_FLAG_DONT_CACHE \| ZIO_FLAG_DONT_PROPAGATE \|
	ZIO_FLAG_DONT_RETRY \| ZIO_FLAG_CANFAIL \| ZIO_FLAG_RAW \|
	ZIO_FLAG_OPTIONAL, NULL, NULL));
	}

	error = zio_wait(zio);
	spa_config_exit(spa, SCL_STATE, FTAG);

	if (error) {
	(void) printf("Read of %s failed, error: %d\n", thing, error);
	goto out;
	}

	uint64_t orig_lsize = lsize;
	buf = lbuf;
	if (flags & ZDB_FLAG_DECOMPRESS) {
	boolean_t failed = zdb_decompress_block(pabd, buf, lbuf,
	lsize, psize, flags);
	if (failed) {
	(void) printf("Decompress of %s failed\n", thing);
	goto out;
	}
	} else {
	buf = abd_borrow_buf_copy(pabd, lsize);
	borrowed = B_TRUE;
	}
	/*
	* Try to detect invalid block pointer. If invalid, try
	* decompressing.
	*/
	if ((flags & ZDB_FLAG_PRINT_BLKPTR \|\| flags & ZDB_FLAG_INDIRECT) &&
	!(flags & ZDB_FLAG_DECOMPRESS)) {
	const blkptr_t b = (const blkptr_t )(void *)
	((uintptr_t)buf + (uintptr_t)blkptr_offset);
	if (zfs_blkptr_verify(spa, b, B_FALSE, BLK_VERIFY_ONLY) ==
	B_FALSE) {
	abd_return_buf_copy(pabd, buf, lsize);
	borrowed = B_FALSE;
	buf = lbuf;
	boolean_t failed = zdb_decompress_block(pabd, buf,
	lbuf, lsize, psize, flags);
	b = (const blkptr_t )(void )
	((uintptr_t)buf + (uintptr_t)blkptr_offset);
	if (failed \|\| zfs_blkptr_verify(spa, b, B_FALSE,
	BLK_VERIFY_LOG) == B_FALSE) {
	printf("invalid block pointer at this DVA\n");
	goto out;
	}
	}
	}

	if (flags & ZDB_FLAG_PRINT_BLKPTR)
	zdb_print_blkptr((blkptr_t )(void )
	((uintptr_t)buf + (uintptr_t)blkptr_offset), flags);
	else if (flags & ZDB_FLAG_RAW)
	zdb_dump_block_raw(buf, lsize, flags);
	else if (flags & ZDB_FLAG_INDIRECT)
	zdb_dump_indirect((blkptr_t *)buf,
	orig_lsize / sizeof (blkptr_t), flags);
	else if (flags & ZDB_FLAG_GBH)
	zdb_dump_gbh(buf, flags);
	else
	zdb_dump_block(thing, buf, lsize, flags);

	/*
	* If :c was specified, iterate through the checksum table to
	* calculate and display each checksum for our specified
	* DVA and length.
	*/
	if ((flags & ZDB_FLAG_CHECKSUM) && !(flags & ZDB_FLAG_RAW) &&
	!(flags & ZDB_FLAG_GBH)) {
	zio_t *czio;
	(void) printf("\n");
	for (enum zio_checksum ck = ZIO_CHECKSUM_LABEL;
	ck < ZIO_CHECKSUM_FUNCTIONS; ck++) {

	if ((zio_checksum_table[ck].ci_flags &
	ZCHECKSUM_FLAG_EMBEDDED) \|\|
	ck == ZIO_CHECKSUM_NOPARITY) {
	continue;
	}
	BP_SET_CHECKSUM(bp, ck);
	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
	czio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL);
	czio->io_bp = bp;

	if (vd == vd->vdev_top) {
	zio_nowait(zio_read(czio, spa, bp, pabd, psize,
	NULL, NULL,
	ZIO_PRIORITY_SYNC_READ,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_RAW \|
	ZIO_FLAG_DONT_RETRY, NULL));
	} else {
	zio_nowait(zio_vdev_child_io(czio, bp, vd,
	offset, pabd, psize, ZIO_TYPE_READ,
	ZIO_PRIORITY_SYNC_READ,
	ZIO_FLAG_DONT_CACHE \|
	ZIO_FLAG_DONT_PROPAGATE \|
	ZIO_FLAG_DONT_RETRY \|
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_RAW \|
	ZIO_FLAG_SPECULATIVE \|
	ZIO_FLAG_OPTIONAL, NULL, NULL));
	}
	error = zio_wait(czio);
	if (error == 0 \|\| error == ECKSUM) {
	zio_t *ck_zio = zio_root(spa, NULL, NULL, 0);
	ck_zio->io_offset =
	DVA_GET_OFFSET(&bp->blk_dva[0]);
	ck_zio->io_bp = bp;
	zio_checksum_compute(ck_zio, ck, pabd, lsize);
	printf("%12s\tcksum=%llx:%llx:%llx:%llx\n",
	zio_checksum_table[ck].ci_name,
	(u_longlong_t)bp->blk_cksum.zc_word[0],
	(u_longlong_t)bp->blk_cksum.zc_word[1],
	(u_longlong_t)bp->blk_cksum.zc_word[2],
	(u_longlong_t)bp->blk_cksum.zc_word[3]);
	zio_wait(ck_zio);
	} else {
	printf("error %d reading block\n", error);
	}
	spa_config_exit(spa, SCL_STATE, FTAG);
	}
	}

	if (borrowed)
	abd_return_buf_copy(pabd, buf, lsize);

	out:
	abd_free(pabd);
	umem_free(lbuf, SPA_MAXBLOCKSIZE);
	done:
	free(flagstr);
	free(dup);
	}

	static void
	zdb_embedded_block(char *thing)
	{
	blkptr_t bp;
	unsigned long long words = (void )&bp;
	char *buf;
	int err;

	bzero(&bp, sizeof (bp));
	err = sscanf(thing, "%llx:%llx:%llx:%llx:%llx:%llx:%llx:%llx:"
	"%llx:%llx:%llx:%llx:%llx:%llx:%llx:%llx",
	words + 0, words + 1, words + 2, words + 3,
	words + 4, words + 5, words + 6, words + 7,
	words + 8, words + 9, words + 10, words + 11,
	words + 12, words + 13, words + 14, words + 15);
	if (err != 16) {
	(void) fprintf(stderr, "invalid input format\n");
	exit(1);
	}
	ASSERT3U(BPE_GET_LSIZE(&bp), <=, SPA_MAXBLOCKSIZE);
	buf = malloc(SPA_MAXBLOCKSIZE);
	if (buf == NULL) {
	(void) fprintf(stderr, "out of memory\n");
	exit(1);
	}
	err = decode_embedded_bp(&bp, buf, BPE_GET_LSIZE(&bp));
	if (err != 0) {
	(void) fprintf(stderr, "decode failed: %u\n", err);
	exit(1);
	}
	zdb_dump_block_raw(buf, BPE_GET_LSIZE(&bp), 0);
	free(buf);
	}

	int
	main(int argc, char **argv)
	{
	int c;
	struct rlimit rl = { 1024, 1024 };
	spa_t *spa = NULL;
	objset_t *os = NULL;
	int dump_all = 1;
	int verbose = 0;
	int error = 0;
	char **searchdirs = NULL;
	int nsearch = 0;
	char target, target_pool, dsname[ZFS_MAX_DATASET_NAME_LEN];
	nvlist_t *policy = NULL;
	uint64_t max_txg = UINT64_MAX;
	int64_t objset_id = -1;
	uint64_t object;
	int flags = ZFS_IMPORT_MISSING_LOG;
	int rewind = ZPOOL_NEVER_REWIND;
	char spa_config_path_env, objset_str;
	boolean_t target_is_spa = B_TRUE, dataset_lookup = B_FALSE;
	nvlist_t *cfg = NULL;

	(void) setrlimit(RLIMIT_NOFILE, &rl);
	(void) enable_extended_FILE_stdio(-1, -1);

	dprintf_setup(&argc, argv);

	/*
	* If there is an environment variable SPA_CONFIG_PATH it overrides
	* default spa_config_path setting. If -U flag is specified it will
	* override this environment variable settings once again.
	*/
	spa_config_path_env = getenv("SPA_CONFIG_PATH");
	if (spa_config_path_env != NULL)
	spa_config_path = spa_config_path_env;

	/*
	* For performance reasons, we set this tunable down. We do so before
	* the arg parsing section so that the user can override this value if
	* they choose.
	*/
	zfs_btree_verify_intensity = 3;

	while ((c = getopt(argc, argv,
	"AbcCdDeEFGhiI:klLmMo:Op:PqrRsSt:uU:vVx:XYyZ")) != -1) {
	switch (c) {
	case 'b':
	case 'c':
	case 'C':
	case 'd':
	case 'D':
	case 'E':
	case 'G':
	case 'h':
	case 'i':
	case 'l':
	case 'm':
	case 'M':
	case 'O':
	case 'r':
	case 'R':
	case 's':
	case 'S':
	case 'u':
	case 'y':
	case 'Z':
	dump_opt[c]++;
	dump_all = 0;
	break;
	case 'A':
	case 'e':
	case 'F':
	case 'k':
	case 'L':
	case 'P':
	case 'q':
	case 'X':
	dump_opt[c]++;
	break;
	case 'Y':
	zfs_reconstruct_indirect_combinations_max = INT_MAX;
	zfs_deadman_enabled = 0;
	break;
	/* NB: Sort single match options below. */
	case 'I':
	max_inflight_bytes = strtoull(optarg, NULL, 0);
	if (max_inflight_bytes == 0) {
	(void) fprintf(stderr, "maximum number "
	"of inflight bytes must be greater "
	"than 0\n");
	usage();
	}
	break;
	case 'o':
	error = set_global_var(optarg);
	if (error != 0)
	usage();
	break;
	case 'p':
	if (searchdirs == NULL) {
	searchdirs = umem_alloc(sizeof (char *),
	UMEM_NOFAIL);
	} else {
	char *tmp = umem_alloc((nsearch + 1)
	sizeof (char *), UMEM_NOFAIL);
	bcopy(searchdirs, tmp, nsearch *
	sizeof (char *));
	umem_free(searchdirs,
	nsearch * sizeof (char *));
	searchdirs = tmp;
	}
	searchdirs[nsearch++] = optarg;
	break;
	case 't':
	max_txg = strtoull(optarg, NULL, 0);
	if (max_txg < TXG_INITIAL) {
	(void) fprintf(stderr, "incorrect txg "
	"specified: %s\n", optarg);
	usage();
	}
	break;
	case 'U':
	spa_config_path = optarg;
	if (spa_config_path[0] != '/') {
	(void) fprintf(stderr,
	"cachefile must be an absolute path "
	"(i.e. start with a slash)\n");
	usage();
	}
	break;
	case 'v':
	verbose++;
	break;
	case 'V':
	flags = ZFS_IMPORT_VERBATIM;
	break;
	case 'x':
	vn_dumpdir = optarg;
	break;
	default:
	usage();
	break;
	}
	}

	if (!dump_opt['e'] && searchdirs != NULL) {
	(void) fprintf(stderr, "-p option requires use of -e\n");
	usage();
	}
	if (dump_opt['d'] \|\| dump_opt['r']) {
	/* <pool>[/<dataset \| objset id> is accepted */
	if (argv[2] && (objset_str = strchr(argv[2], '/')) != NULL &&
	objset_str++ != NULL) {
	char *endptr;
	errno = 0;
	objset_id = strtoull(objset_str, &endptr, 0);
	/* dataset 0 is the same as opening the pool */
	if (errno == 0 && endptr != objset_str &&
	objset_id != 0) {
	target_is_spa = B_FALSE;
	dataset_lookup = B_TRUE;
	} else if (objset_id != 0) {
	printf("failed to open objset %s "
	"%llu %s", objset_str,
	(u_longlong_t)objset_id,
	strerror(errno));
	exit(1);
	}
	/* normal dataset name not an objset ID */
	if (endptr == objset_str) {
	objset_id = -1;
	}
	}
	}

	#if defined(_LP64)
	/*
	* ZDB does not typically re-read blocks; therefore limit the ARC
	* to 256 MB, which can be used entirely for metadata.
	*/
	zfs_arc_min = zfs_arc_meta_min = 2ULL << SPA_MAXBLOCKSHIFT;
	zfs_arc_max = zfs_arc_meta_limit = 256 * 1024 * 1024;
	#endif

	/*
	* "zdb -c" uses checksum-verifying scrub i/os which are async reads.
	* "zdb -b" uses traversal prefetch which uses async reads.
	* For good performance, let several of them be active at once.
	*/
	zfs_vdev_async_read_max_active = 10;

	/*
	* Disable reference tracking for better performance.
	*/
	reference_tracking_enable = B_FALSE;

	/*
	* Do not fail spa_load when spa_load_verify fails. This is needed
	* to load non-idle pools.
	*/
	spa_load_verify_dryrun = B_TRUE;

	kernel_init(SPA_MODE_READ);

	if (dump_all)
	verbose = MAX(verbose, 1);

	for (c = 0; c < 256; c++) {
	if (dump_all && strchr("AeEFklLOPrRSXy", c) == NULL)
	dump_opt[c] = 1;
	if (dump_opt[c])
	dump_opt[c] += verbose;
	}

	aok = (dump_opt['A'] == 1) \|\| (dump_opt['A'] > 2);
	zfs_recover = (dump_opt['A'] > 1);

	argc -= optind;
	argv += optind;
	if (argc < 2 && dump_opt['R'])
	usage();

	if (dump_opt['E']) {
	if (argc != 1)
	usage();
	zdb_embedded_block(argv[0]);
	return (0);
	}

	if (argc < 1) {
	if (!dump_opt['e'] && dump_opt['C']) {
	dump_cachefile(spa_config_path);
	return (0);
	}
	usage();
	}

	if (dump_opt['l'])
	return (dump_label(argv[0]));

	if (dump_opt['O']) {
	if (argc != 2)
	usage();
	dump_opt['v'] = verbose + 3;
	return (dump_path(argv[0], argv[1], NULL));
	}
	if (dump_opt['r']) {
	if (argc != 3)
	usage();
	dump_opt['v'] = verbose;
	error = dump_path(argv[0], argv[1], &object);
	}

	if (dump_opt['X'] \|\| dump_opt['F'])
	rewind = ZPOOL_DO_REWIND \|
	(dump_opt['X'] ? ZPOOL_EXTREME_REWIND : 0);

	if (nvlist_alloc(&policy, NV_UNIQUE_NAME_TYPE, 0) != 0 \|\|
	nvlist_add_uint64(policy, ZPOOL_LOAD_REQUEST_TXG, max_txg) != 0 \|\|
	nvlist_add_uint32(policy, ZPOOL_LOAD_REWIND_POLICY, rewind) != 0)
	fatal("internal error: %s", strerror(ENOMEM));

	error = 0;
	target = argv[0];

	if (strpbrk(target, "/@") != NULL) {
	size_t targetlen;

	target_pool = strdup(target);
	*strpbrk(target_pool, "/@") = '\0';

	target_is_spa = B_FALSE;
	targetlen = strlen(target);
	if (targetlen && target[targetlen - 1] == '/')
	target[targetlen - 1] = '\0';
	} else {
	target_pool = target;
	}

	if (dump_opt['e']) {
	importargs_t args = { 0 };

	args.paths = nsearch;
	args.path = searchdirs;
	args.can_be_active = B_TRUE;

	error = zpool_find_config(NULL, target_pool, &cfg, &args,
	&libzpool_config_ops);

	if (error == 0) {

	if (nvlist_add_nvlist(cfg,
	ZPOOL_LOAD_POLICY, policy) != 0) {
	fatal("can't open '%s': %s",
	target, strerror(ENOMEM));
	}

	if (dump_opt['C'] > 1) {
	(void) printf("\nConfiguration for import:\n");
	dump_nvlist(cfg, 8);
	}

	/*
	* Disable the activity check to allow examination of
	* active pools.
	*/
	error = spa_import(target_pool, cfg, NULL,
	flags \| ZFS_IMPORT_SKIP_MMP);
	}
	}

	if (searchdirs != NULL) {
	umem_free(searchdirs, nsearch * sizeof (char *));
	searchdirs = NULL;
	}

	/*
	* import_checkpointed_state makes the assumption that the
	* target pool that we pass it is already part of the spa
	* namespace. Because of that we need to make sure to call
	* it always after the -e option has been processed, which
	* imports the pool to the namespace if it's not in the
	* cachefile.
	*/
	char *checkpoint_pool = NULL;
	char *checkpoint_target = NULL;
	if (dump_opt['k']) {
	checkpoint_pool = import_checkpointed_state(target, cfg,
	&checkpoint_target);

	if (checkpoint_target != NULL)
	target = checkpoint_target;
	}

	if (cfg != NULL) {
	nvlist_free(cfg);
	cfg = NULL;
	}

	if (target_pool != target)
	free(target_pool);

	if (error == 0) {
	if (dump_opt['k'] && (target_is_spa \|\| dump_opt['R'])) {
	ASSERT(checkpoint_pool != NULL);
	ASSERT(checkpoint_target == NULL);

	error = spa_open(checkpoint_pool, &spa, FTAG);
	if (error != 0) {
	fatal("Tried to open pool \"%s\" but "
	"spa_open() failed with error %d\n",
	checkpoint_pool, error);
	}

	} else if (target_is_spa \|\| dump_opt['R'] \|\| objset_id == 0) {
	zdb_set_skip_mmp(target);
	error = spa_open_rewind(target, &spa, FTAG, policy,
	NULL);
	if (error) {
	/*
	* If we're missing the log device then
	* try opening the pool after clearing the
	* log state.
	*/
	mutex_enter(&spa_namespace_lock);
	if ((spa = spa_lookup(target)) != NULL &&
	spa->spa_log_state == SPA_LOG_MISSING) {
	spa->spa_log_state = SPA_LOG_CLEAR;
	error = 0;
	}
	mutex_exit(&spa_namespace_lock);

	if (!error) {
	error = spa_open_rewind(target, &spa,
	FTAG, policy, NULL);
	}
	}
	} else if (strpbrk(target, "#") != NULL) {
	dsl_pool_t *dp;
	error = dsl_pool_hold(target, FTAG, &dp);
	if (error != 0) {
	fatal("can't dump '%s': %s", target,
	strerror(error));
	}
	error = dump_bookmark(dp, target, B_TRUE, verbose > 1);
	dsl_pool_rele(dp, FTAG);
	if (error != 0) {
	fatal("can't dump '%s': %s", target,
	strerror(error));
	}
	return (error);
	} else {
	zdb_set_skip_mmp(target);
	if (dataset_lookup == B_TRUE) {
	/*
	* Use the supplied id to get the name
	* for open_objset.
	*/
	error = spa_open(target, &spa, FTAG);
	if (error == 0) {
	error = name_from_objset_id(spa,
	objset_id, dsname);
	spa_close(spa, FTAG);
	if (error == 0)
	target = dsname;
	}
	}
	if (error == 0)
	error = open_objset(target, FTAG, &os);
	if (error == 0)
	spa = dmu_objset_spa(os);
	}
	}
	nvlist_free(policy);

	if (error)
	fatal("can't open '%s': %s", target, strerror(error));

	/*
	* Set the pool failure mode to panic in order to prevent the pool
	* from suspending. A suspended I/O will have no way to resume and
	* can prevent the zdb(8) command from terminating as expected.
	*/
	if (spa != NULL)
	spa->spa_failmode = ZIO_FAILURE_MODE_PANIC;

	argv++;
	argc--;
	if (dump_opt['r']) {
	error = zdb_copy_object(os, object, argv[1]);
	} else if (!dump_opt['R']) {
	flagbits['d'] = ZOR_FLAG_DIRECTORY;
	flagbits['f'] = ZOR_FLAG_PLAIN_FILE;
	flagbits['m'] = ZOR_FLAG_SPACE_MAP;
	flagbits['z'] = ZOR_FLAG_ZAP;
	flagbits['A'] = ZOR_FLAG_ALL_TYPES;

	if (argc > 0 && dump_opt['d']) {
	zopt_object_args = argc;
	zopt_object_ranges = calloc(zopt_object_args,
	sizeof (zopt_object_range_t));
	for (unsigned i = 0; i < zopt_object_args; i++) {
	int err;
	char *msg = NULL;

	err = parse_object_range(argv[i],
	&zopt_object_ranges[i], &msg);
	if (err != 0)
	fatal("Bad object or range: '%s': %s\n",
	argv[i], msg ? msg : "");
	}
	} else if (argc > 0 && dump_opt['m']) {
	zopt_metaslab_args = argc;
	zopt_metaslab = calloc(zopt_metaslab_args,
	sizeof (uint64_t));
	for (unsigned i = 0; i < zopt_metaslab_args; i++) {
	errno = 0;
	zopt_metaslab[i] = strtoull(argv[i], NULL, 0);
	if (zopt_metaslab[i] == 0 && errno != 0)
	fatal("bad number %s: %s", argv[i],
	strerror(errno));
	}
	}
	if (os != NULL) {
	dump_objset(os);
	} else if (zopt_object_args > 0 && !dump_opt['m']) {
	dump_objset(spa->spa_meta_objset);
	} else {
	dump_zpool(spa);
	}
	} else {
	flagbits['b'] = ZDB_FLAG_PRINT_BLKPTR;
	flagbits['c'] = ZDB_FLAG_CHECKSUM;
	flagbits['d'] = ZDB_FLAG_DECOMPRESS;
	flagbits['e'] = ZDB_FLAG_BSWAP;
	flagbits['g'] = ZDB_FLAG_GBH;
	flagbits['i'] = ZDB_FLAG_INDIRECT;
	flagbits['r'] = ZDB_FLAG_RAW;
	flagbits['v'] = ZDB_FLAG_VERBOSE;

	for (int i = 0; i < argc; i++)
	zdb_read_block(argv[i], spa);
	}

	if (dump_opt['k']) {
	free(checkpoint_pool);
	if (!target_is_spa)
	free(checkpoint_target);
	}

	if (os != NULL) {
	close_objset(os, FTAG);
	} else {
	spa_close(spa, FTAG);
	}

	fuid_table_destroy();

	dump_debug_buffer();

	kernel_fini();

	return (error);
	}
	diff --git a/sys/contrib/openzfs/cmd/zed/agents/zfs_mod.c b/sys/contrib/openzfs/cmd/zed/agents/zfs_mod.c
	index b564f2b12a26..3bcdf6e1d718 100644
	--- a/sys/contrib/openzfs/cmd/zed/agents/zfs_mod.c
	+++ b/sys/contrib/openzfs/cmd/zed/agents/zfs_mod.c
	@@ -1,963 +1,991 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012 by Delphix. All rights reserved.
	* Copyright 2014 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2016, 2017, Intel Corporation.
	* Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
	*/

	/*
	* ZFS syseventd module.
	*
	* file origin: openzfs/usr/src/cmd/syseventd/modules/zfs_mod/zfs_mod.c
	*
	* The purpose of this module is to identify when devices are added to the
	* system, and appropriately online or replace the affected vdevs.
	*
	* When a device is added to the system:
	*
	* 1. Search for any vdevs whose devid matches that of the newly added
	* device.
	*
	* 2. If no vdevs are found, then search for any vdevs whose udev path
	* matches that of the new device.
	*
	* 3. If no vdevs match by either method, then ignore the event.
	*
	* 4. Attempt to online the device with a flag to indicate that it should
	* be unspared when resilvering completes. If this succeeds, then the
	* same device was inserted and we should continue normally.
	*
	* 5. If the pool does not have the 'autoreplace' property set, attempt to
	* online the device again without the unspare flag, which will
	* generate a FMA fault.
	*
	* 6. If the pool has the 'autoreplace' property set, and the matching vdev
	* is a whole disk, then label the new disk and attempt a 'zpool
	* replace'.
	*
	* The module responds to EC_DEV_ADD events. The special ESC_ZFS_VDEV_CHECK
	* event indicates that a device failed to open during pool load, but the
	* autoreplace property was set. In this case, we deferred the associated
	* FMA fault until our module had a chance to process the autoreplace logic.
	* If the device could not be replaced, then the second online attempt will
	* trigger the FMA fault that we skipped earlier.
	*
	* On Linux udev provides a disk insert for both the disk and the partition.
	*/

	#include <ctype.h>
	#include <fcntl.h>
	#include <libnvpair.h>
	#include <libzfs.h>
	#include <libzutil.h>
	#include <limits.h>
	#include <stddef.h>
	#include <stdlib.h>
	#include <string.h>
	#include <syslog.h>
	#include <sys/list.h>
	#include <sys/sunddi.h>
	#include <sys/sysevent/eventdefs.h>
	#include <sys/sysevent/dev.h>
	#include <thread_pool.h>
	#include <pthread.h>
	#include <unistd.h>
	#include <errno.h>
	#include "zfs_agents.h"
	#include "../zed_log.h"

	#define DEV_BYID_PATH "/dev/disk/by-id/"
	#define DEV_BYPATH_PATH "/dev/disk/by-path/"
	#define DEV_BYVDEV_PATH "/dev/disk/by-vdev/"

	typedef void (zfs_process_func_t)(zpool_handle_t , nvlist_t *, boolean_t);

	libzfs_handle_t *g_zfshdl;
	list_t g_pool_list; /* list of unavailable pools at initialization */
	list_t g_device_list; /* list of disks with asynchronous label request */
	tpool_t *g_tpool;
	boolean_t g_enumeration_done;
	pthread_t g_zfs_tid; /* zfs_enum_pools() thread */

	typedef struct unavailpool {
	zpool_handle_t *uap_zhp;
	list_node_t uap_node;
	} unavailpool_t;

	typedef struct pendingdev {
	char pd_physpath[128];
	list_node_t pd_node;
	} pendingdev_t;

	static int
	zfs_toplevel_state(zpool_handle_t *zhp)
	{
	nvlist_t *nvroot;
	vdev_stat_t *vs;
	unsigned int c;

	verify(nvlist_lookup_nvlist(zpool_get_config(zhp, NULL),
	ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
	verify(nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &c) == 0);
	return (vs->vs_state);
	}

	static int
	zfs_unavail_pool(zpool_handle_t zhp, void data)
	{
	zed_log_msg(LOG_INFO, "zfs_unavail_pool: examining '%s' (state %d)",
	zpool_get_name(zhp), (int)zfs_toplevel_state(zhp));

	if (zfs_toplevel_state(zhp) < VDEV_STATE_DEGRADED) {
	unavailpool_t *uap;
	uap = malloc(sizeof (unavailpool_t));
	uap->uap_zhp = zhp;
	list_insert_tail((list_t *)data, uap);
	} else {
	zpool_close(zhp);
	}
	return (0);
	}

	/*
	* Two stage replace on Linux
	* since we get disk notifications
	* we can wait for partitioned disk slice to show up!
	*
	* First stage tags the disk, initiates async partitioning, and returns
	* Second stage finds the tag and proceeds to ZFS labeling/replace
	*
	* disk-add --> label-disk + tag-disk --> partition-add --> zpool_vdev_attach
	*
	* 1. physical match with no fs, no partition
	* tag it top, partition disk
	*
	* 2. physical match again, see partition and tag
	*
	*/

	/*
	* The device associated with the given vdev (either by devid or physical path)
	* has been added to the system. If 'isdisk' is set, then we only attempt a
	* replacement if it's a whole disk. This also implies that we should label the
	* disk first.
	*
	* First, we attempt to online the device (making sure to undo any spare
	* operation when finished). If this succeeds, then we're done. If it fails,
	* and the new state is VDEV_CANT_OPEN, it indicates that the device was opened,
	* but that the label was not what we expected. If the 'autoreplace' property
	* is enabled, then we relabel the disk (if specified), and attempt a 'zpool
	* replace'. If the online is successful, but the new state is something else
	* (REMOVED or FAULTED), it indicates that we're out of sync or in some sort of
	* race, and we should avoid attempting to relabel the disk.
	*
	* Also can arrive here from a ESC_ZFS_VDEV_CHECK event
	*/
	static void
	zfs_process_add(zpool_handle_t zhp, nvlist_t vdev, boolean_t labeled)
	{
	char *path;
	vdev_state_t newstate;
	nvlist_t nvroot, newvd;
	pendingdev_t *device;
	uint64_t wholedisk = 0ULL;
	uint64_t offline = 0ULL;
	uint64_t guid = 0ULL;
	char physpath = NULL, new_devid = NULL, *enc_sysfs_path = NULL;
	char rawpath[PATH_MAX], fullpath[PATH_MAX];
	char devpath[PATH_MAX];
	int ret;
	boolean_t is_dm = B_FALSE;
	boolean_t is_sd = B_FALSE;
	uint_t c;
	vdev_stat_t *vs;

	if (nvlist_lookup_string(vdev, ZPOOL_CONFIG_PATH, &path) != 0)
	return;

	/* Skip healthy disks */
	verify(nvlist_lookup_uint64_array(vdev, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &c) == 0);
	if (vs->vs_state == VDEV_STATE_HEALTHY) {
	zed_log_msg(LOG_INFO, "%s: %s is already healthy, skip it.",
	__func__, path);
	return;
	}

	(void) nvlist_lookup_string(vdev, ZPOOL_CONFIG_PHYS_PATH, &physpath);
	(void) nvlist_lookup_string(vdev, ZPOOL_CONFIG_VDEV_ENC_SYSFS_PATH,
	&enc_sysfs_path);
	(void) nvlist_lookup_uint64(vdev, ZPOOL_CONFIG_WHOLE_DISK, &wholedisk);
	(void) nvlist_lookup_uint64(vdev, ZPOOL_CONFIG_OFFLINE, &offline);
	(void) nvlist_lookup_uint64(vdev, ZPOOL_CONFIG_GUID, &guid);

	if (offline)
	return; /* don't intervene if it was taken offline */

	is_dm = zfs_dev_is_dm(path);
	zed_log_msg(LOG_INFO, "zfs_process_add: pool '%s' vdev '%s', phys '%s'"
	" wholedisk %d, %s dm (guid %llu)", zpool_get_name(zhp), path,
	physpath ? physpath : "NULL", wholedisk, is_dm ? "is" : "not",
	(long long unsigned int)guid);

	/*
	* The VDEV guid is preferred for identification (gets passed in path)
	*/
	if (guid != 0) {
	(void) snprintf(fullpath, sizeof (fullpath), "%llu",
	(long long unsigned int)guid);
	} else {
	/*
	* otherwise use path sans partition suffix for whole disks
	*/
	(void) strlcpy(fullpath, path, sizeof (fullpath));
	if (wholedisk) {
	char *spath = zfs_strip_partition(fullpath);
	if (!spath) {
	zed_log_msg(LOG_INFO, "%s: Can't alloc",
	__func__);
	return;
	}

	(void) strlcpy(fullpath, spath, sizeof (fullpath));
	free(spath);
	}
	}

	/*
	* Attempt to online the device.
	*/
	if (zpool_vdev_online(zhp, fullpath,
	ZFS_ONLINE_CHECKREMOVE \| ZFS_ONLINE_UNSPARE, &newstate) == 0 &&
	(newstate == VDEV_STATE_HEALTHY \|\|
	newstate == VDEV_STATE_DEGRADED)) {
	zed_log_msg(LOG_INFO, " zpool_vdev_online: vdev %s is %s",
	fullpath, (newstate == VDEV_STATE_HEALTHY) ?
	"HEALTHY" : "DEGRADED");
	return;
	}

	/*
	* vdev_id alias rule for using scsi_debug devices (FMA automated
	* testing)
	*/
	if (physpath != NULL && strcmp("scsidebug", physpath) == 0)
	is_sd = B_TRUE;

	/*
	* If the pool doesn't have the autoreplace property set, then use
	* vdev online to trigger a FMA fault by posting an ereport.
	*/
	if (!zpool_get_prop_int(zhp, ZPOOL_PROP_AUTOREPLACE, NULL) \|\|
	!(wholedisk \|\| is_dm) \|\| (physpath == NULL)) {
	(void) zpool_vdev_online(zhp, fullpath, ZFS_ONLINE_FORCEFAULT,
	&newstate);
	zed_log_msg(LOG_INFO, "Pool's autoreplace is not enabled or "
	"not a whole disk for '%s'", fullpath);
	return;
	}

	/*
	* Convert physical path into its current device node. Rawpath
	* needs to be /dev/disk/by-vdev for a scsi_debug device since
	* /dev/disk/by-path will not be present.
	*/
	(void) snprintf(rawpath, sizeof (rawpath), "%s%s",
	is_sd ? DEV_BYVDEV_PATH : DEV_BYPATH_PATH, physpath);

	if (realpath(rawpath, devpath) == NULL && !is_dm) {
	zed_log_msg(LOG_INFO, " realpath: %s failed (%s)",
	rawpath, strerror(errno));

	(void) zpool_vdev_online(zhp, fullpath, ZFS_ONLINE_FORCEFAULT,
	&newstate);

	zed_log_msg(LOG_INFO, " zpool_vdev_online: %s FORCEFAULT (%s)",
	fullpath, libzfs_error_description(g_zfshdl));
	return;
	}

	/* Only autoreplace bad disks */
	if ((vs->vs_state != VDEV_STATE_DEGRADED) &&
	(vs->vs_state != VDEV_STATE_FAULTED) &&
	(vs->vs_state != VDEV_STATE_CANT_OPEN)) {
	return;
	}

	nvlist_lookup_string(vdev, "new_devid", &new_devid);

	if (is_dm) {
	/* Don't label device mapper or multipath disks. */
	} else if (!labeled) {
	/*
	* we're auto-replacing a raw disk, so label it first
	*/
	char *leafname;

	/*
	* If this is a request to label a whole disk, then attempt to
	* write out the label. Before we can label the disk, we need
	* to map the physical string that was matched on to the under
	* lying device node.
	*
	* If any part of this process fails, then do a force online
	* to trigger a ZFS fault for the device (and any hot spare
	* replacement).
	*/
	leafname = strrchr(devpath, '/') + 1;

	/*
	* If this is a request to label a whole disk, then attempt to
	* write out the label.
	*/
	if (zpool_label_disk(g_zfshdl, zhp, leafname) != 0) {
	zed_log_msg(LOG_INFO, " zpool_label_disk: could not "
	"label '%s' (%s)", leafname,
	libzfs_error_description(g_zfshdl));

	(void) zpool_vdev_online(zhp, fullpath,
	ZFS_ONLINE_FORCEFAULT, &newstate);
	return;
	}

	/*
	* The disk labeling is asynchronous on Linux. Just record
	* this label request and return as there will be another
	* disk add event for the partition after the labeling is
	* completed.
	*/
	device = malloc(sizeof (pendingdev_t));
	(void) strlcpy(device->pd_physpath, physpath,
	sizeof (device->pd_physpath));
	list_insert_tail(&g_device_list, device);

	zed_log_msg(LOG_INFO, " zpool_label_disk: async '%s' (%llu)",
	leafname, (u_longlong_t)guid);

	return; /* resumes at EC_DEV_ADD.ESC_DISK for partition */

	} else /* labeled */ {
	boolean_t found = B_FALSE;
	/*
	* match up with request above to label the disk
	*/
	for (device = list_head(&g_device_list); device != NULL;
	device = list_next(&g_device_list, device)) {
	if (strcmp(physpath, device->pd_physpath) == 0) {
	list_remove(&g_device_list, device);
	free(device);
	found = B_TRUE;
	break;
	}
	zed_log_msg(LOG_INFO, "zpool_label_disk: %s != %s",
	physpath, device->pd_physpath);
	}
	if (!found) {
	/* unexpected partition slice encountered */
	zed_log_msg(LOG_INFO, "labeled disk %s unexpected here",
	fullpath);
	(void) zpool_vdev_online(zhp, fullpath,
	ZFS_ONLINE_FORCEFAULT, &newstate);
	return;
	}

	zed_log_msg(LOG_INFO, " zpool_label_disk: resume '%s' (%llu)",
	physpath, (u_longlong_t)guid);

	(void) snprintf(devpath, sizeof (devpath), "%s%s",
	DEV_BYID_PATH, new_devid);
	}

	/*
	* Construct the root vdev to pass to zpool_vdev_attach(). While adding
	* the entire vdev structure is harmless, we construct a reduced set of
	* path/physpath/wholedisk to keep it simple.
	*/
	if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0) {
	zed_log_msg(LOG_WARNING, "zfs_mod: nvlist_alloc out of memory");
	return;
	}
	if (nvlist_alloc(&newvd, NV_UNIQUE_NAME, 0) != 0) {
	zed_log_msg(LOG_WARNING, "zfs_mod: nvlist_alloc out of memory");
	nvlist_free(nvroot);
	return;
	}

	if (nvlist_add_string(newvd, ZPOOL_CONFIG_TYPE, VDEV_TYPE_DISK) != 0 \|\|
	nvlist_add_string(newvd, ZPOOL_CONFIG_PATH, path) != 0 \|\|
	nvlist_add_string(newvd, ZPOOL_CONFIG_DEVID, new_devid) != 0 \|\|
	(physpath != NULL && nvlist_add_string(newvd,
	ZPOOL_CONFIG_PHYS_PATH, physpath) != 0) \|\|
	(enc_sysfs_path != NULL && nvlist_add_string(newvd,
	ZPOOL_CONFIG_VDEV_ENC_SYSFS_PATH, enc_sysfs_path) != 0) \|\|
	nvlist_add_uint64(newvd, ZPOOL_CONFIG_WHOLE_DISK, wholedisk) != 0 \|\|
	nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, VDEV_TYPE_ROOT) != 0 \|\|
	nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, &newvd,
	1) != 0) {
	zed_log_msg(LOG_WARNING, "zfs_mod: unable to add nvlist pairs");
	nvlist_free(newvd);
	nvlist_free(nvroot);
	return;
	}

	nvlist_free(newvd);

	/*
	* Wait for udev to verify the links exist, then auto-replace
	* the leaf disk at same physical location.
	*/
	if (zpool_label_disk_wait(path, 3000) != 0) {
	zed_log_msg(LOG_WARNING, "zfs_mod: expected replacement "
	"disk %s is missing", path);
	nvlist_free(nvroot);
	return;
	}

	/*
	* Prefer sequential resilvering when supported (mirrors and dRAID),
	* otherwise fallback to a traditional healing resilver.
	*/
	ret = zpool_vdev_attach(zhp, fullpath, path, nvroot, B_TRUE, B_TRUE);
	if (ret != 0) {
	ret = zpool_vdev_attach(zhp, fullpath, path, nvroot,
	B_TRUE, B_FALSE);
	}

	zed_log_msg(LOG_INFO, " zpool_vdev_replace: %s with %s (%s)",
	fullpath, path, (ret == 0) ? "no errors" :
	libzfs_error_description(g_zfshdl));

	nvlist_free(nvroot);
	}

	/*
	* Utility functions to find a vdev matching given criteria.
	*/
	typedef struct dev_data {
	const char *dd_compare;
	const char *dd_prop;
	zfs_process_func_t dd_func;
	boolean_t dd_found;
	boolean_t dd_islabeled;
	uint64_t dd_pool_guid;
	uint64_t dd_vdev_guid;
	const char *dd_new_devid;
	} dev_data_t;

	static void
	zfs_iter_vdev(zpool_handle_t zhp, nvlist_t nvl, void *data)
	{
	dev_data_t *dp = data;
	char *path = NULL;
	uint_t c, children;
	nvlist_t **child;

	/*
	* First iterate over any children.
	*/
	if (nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN,
	&child, &children) == 0) {
	for (c = 0; c < children; c++)
	zfs_iter_vdev(zhp, child[c], data);
	}

	/*
	* Iterate over any spares and cache devices
	*/
	if (nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_SPARES,
	&child, &children) == 0) {
	for (c = 0; c < children; c++)
	zfs_iter_vdev(zhp, child[c], data);
	}
	if (nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_L2CACHE,
	&child, &children) == 0) {
	for (c = 0; c < children; c++)
	zfs_iter_vdev(zhp, child[c], data);
	}

	/* once a vdev was matched and processed there is nothing left to do */
	if (dp->dd_found)
	return;

	/*
	* Match by GUID if available otherwise fallback to devid or physical
	*/
	if (dp->dd_vdev_guid != 0) {
	uint64_t guid;

	if (nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_GUID,
	&guid) != 0 \|\| guid != dp->dd_vdev_guid) {
	return;
	}
	zed_log_msg(LOG_INFO, " zfs_iter_vdev: matched on %llu", guid);
	dp->dd_found = B_TRUE;

	} else if (dp->dd_compare != NULL) {
	/*
	* NOTE: On Linux there is an event for partition, so unlike
	* illumos, substring matching is not required to accommodate
	* the partition suffix. An exact match will be present in
	* the dp->dd_compare value.
	*/
	if (nvlist_lookup_string(nvl, dp->dd_prop, &path) != 0 \|\|
	strcmp(dp->dd_compare, path) != 0)
	return;

	zed_log_msg(LOG_INFO, " zfs_iter_vdev: matched %s on %s",
	dp->dd_prop, path);
	dp->dd_found = B_TRUE;

	/* pass the new devid for use by replacing code */
	if (dp->dd_new_devid != NULL) {
	(void) nvlist_add_string(nvl, "new_devid",
	dp->dd_new_devid);
	}
	}

	(dp->dd_func)(zhp, nvl, dp->dd_islabeled);
	}

	static void
	zfs_enable_ds(void *arg)
	{
	unavailpool_t pool = (unavailpool_t )arg;

	(void) zpool_enable_datasets(pool->uap_zhp, NULL, 0);
	zpool_close(pool->uap_zhp);
	free(pool);
	}

	static int
	zfs_iter_pool(zpool_handle_t zhp, void data)
	{
	nvlist_t config, nvl;
	dev_data_t *dp = data;
	uint64_t pool_guid;
	unavailpool_t *pool;

	zed_log_msg(LOG_INFO, "zfs_iter_pool: evaluating vdevs on %s (by %s)",
	zpool_get_name(zhp), dp->dd_vdev_guid ? "GUID" : dp->dd_prop);

	/*
	* For each vdev in this pool, look for a match to apply dd_func
	*/
	if ((config = zpool_get_config(zhp, NULL)) != NULL) {
	if (dp->dd_pool_guid == 0 \|\|
	(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	&pool_guid) == 0 && pool_guid == dp->dd_pool_guid)) {
	(void) nvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_VDEV_TREE, &nvl);
	zfs_iter_vdev(zhp, nvl, data);
	}
	}

	/*
	* if this pool was originally unavailable,
	* then enable its datasets asynchronously
	*/
	if (g_enumeration_done) {
	for (pool = list_head(&g_pool_list); pool != NULL;
	pool = list_next(&g_pool_list, pool)) {

	if (strcmp(zpool_get_name(zhp),
	zpool_get_name(pool->uap_zhp)))
	continue;
	if (zfs_toplevel_state(zhp) >= VDEV_STATE_DEGRADED) {
	list_remove(&g_pool_list, pool);
	(void) tpool_dispatch(g_tpool, zfs_enable_ds,
	pool);
	break;
	}
	}
	}

	zpool_close(zhp);
	return (dp->dd_found); /* cease iteration after a match */
	}

	/*
	* Given a physical device location, iterate over all
	* (pool, vdev) pairs which correspond to that location.
	*/
	static boolean_t
	devphys_iter(const char physical, const char devid, zfs_process_func_t func,
	boolean_t is_slice)
	{
	dev_data_t data = { 0 };

	data.dd_compare = physical;
	data.dd_func = func;
	data.dd_prop = ZPOOL_CONFIG_PHYS_PATH;
	data.dd_found = B_FALSE;
	data.dd_islabeled = is_slice;
	data.dd_new_devid = devid; /* used by auto replace code */

	(void) zpool_iter(g_zfshdl, zfs_iter_pool, &data);

	return (data.dd_found);
	}

	/*
	* Given a device identifier, find any vdevs with a matching devid.
	* On Linux we can match devid directly which is always a whole disk.
	*/
	static boolean_t
	devid_iter(const char *devid, zfs_process_func_t func, boolean_t is_slice)
	{
	dev_data_t data = { 0 };

	data.dd_compare = devid;
	data.dd_func = func;
	data.dd_prop = ZPOOL_CONFIG_DEVID;
	data.dd_found = B_FALSE;
	data.dd_islabeled = is_slice;
	data.dd_new_devid = devid;

	(void) zpool_iter(g_zfshdl, zfs_iter_pool, &data);

	return (data.dd_found);
	}

	+/*
	+ * Given a device guid, find any vdevs with a matching guid.
	+ */
	+static boolean_t
	+guid_iter(uint64_t pool_guid, uint64_t vdev_guid, const char *devid,
	+ zfs_process_func_t func, boolean_t is_slice)
	+{
	+ dev_data_t data = { 0 };
	+
	+ data.dd_func = func;
	+ data.dd_found = B_FALSE;
	+ data.dd_pool_guid = pool_guid;
	+ data.dd_vdev_guid = vdev_guid;
	+ data.dd_islabeled = is_slice;
	+ data.dd_new_devid = devid;
	+
	+ (void) zpool_iter(g_zfshdl, zfs_iter_pool, &data);
	+
	+ return (data.dd_found);
	+}
	+
	/*
	* Handle a EC_DEV_ADD.ESC_DISK event.
	*
	* illumos
	* Expects: DEV_PHYS_PATH string in schema
	* Matches: vdev's ZPOOL_CONFIG_PHYS_PATH or ZPOOL_CONFIG_DEVID
	*
	* path: '/dev/dsk/c0t1d0s0' (persistent)
	* devid: 'id1,sd@SATA_____Hitachi_HDS72101______JP2940HZ3H74MC/a'
	* phys_path: '/pci@0,0/pci103c,1609@11/disk@1,0:a'
	*
	* linux
	* provides: DEV_PHYS_PATH and DEV_IDENTIFIER strings in schema
	* Matches: vdev's ZPOOL_CONFIG_PHYS_PATH or ZPOOL_CONFIG_DEVID
	*
	* path: '/dev/sdc1' (not persistent)
	* devid: 'ata-SAMSUNG_HD204UI_S2HGJD2Z805891-part1'
	* phys_path: 'pci-0000:04:00.0-sas-0x4433221106000000-lun-0'
	*/
	static int
	zfs_deliver_add(nvlist_t *nvl, boolean_t is_lofi)
	{
	char devpath = NULL, devid;
	+ uint64_t pool_guid = 0, vdev_guid = 0;
	boolean_t is_slice;

	/*
	- * Expecting a devid string and an optional physical location
	+ * Expecting a devid string and an optional physical location and guid
	*/
	if (nvlist_lookup_string(nvl, DEV_IDENTIFIER, &devid) != 0)
	return (-1);

	(void) nvlist_lookup_string(nvl, DEV_PHYS_PATH, &devpath);
	+ (void) nvlist_lookup_uint64(nvl, ZFS_EV_POOL_GUID, &pool_guid);
	+ (void) nvlist_lookup_uint64(nvl, ZFS_EV_VDEV_GUID, &vdev_guid);

	is_slice = (nvlist_lookup_boolean(nvl, DEV_IS_PART) == 0);

	zed_log_msg(LOG_INFO, "zfs_deliver_add: adding %s (%s) (is_slice %d)",
	devid, devpath ? devpath : "NULL", is_slice);

	/*
	* Iterate over all vdevs looking for a match in the following order:
	* 1. ZPOOL_CONFIG_DEVID (identifies the unique disk)
	* 2. ZPOOL_CONFIG_PHYS_PATH (identifies disk physical location).
	- *
	- * For disks, we only want to pay attention to vdevs marked as whole
	- * disks or are a multipath device.
	+ * 3. ZPOOL_CONFIG_GUID (identifies unique vdev).
	*/
	- if (!devid_iter(devid, zfs_process_add, is_slice) && devpath != NULL)
	- (void) devphys_iter(devpath, devid, zfs_process_add, is_slice);
	+ if (devid_iter(devid, zfs_process_add, is_slice))
	+ return (0);
	+ if (devpath != NULL && devphys_iter(devpath, devid, zfs_process_add,
	+ is_slice))
	+ return (0);
	+ if (vdev_guid != 0)
	+ (void) guid_iter(pool_guid, vdev_guid, devid, zfs_process_add,
	+ is_slice);

	return (0);
	}

	/*
	* Called when we receive a VDEV_CHECK event, which indicates a device could not
	* be opened during initial pool open, but the autoreplace property was set on
	* the pool. In this case, we treat it as if it were an add event.
	*/
	static int
	zfs_deliver_check(nvlist_t *nvl)
	{
	dev_data_t data = { 0 };

	if (nvlist_lookup_uint64(nvl, ZFS_EV_POOL_GUID,
	&data.dd_pool_guid) != 0 \|\|
	nvlist_lookup_uint64(nvl, ZFS_EV_VDEV_GUID,
	&data.dd_vdev_guid) != 0 \|\|
	data.dd_vdev_guid == 0)
	return (0);

	zed_log_msg(LOG_INFO, "zfs_deliver_check: pool '%llu', vdev %llu",
	data.dd_pool_guid, data.dd_vdev_guid);

	data.dd_func = zfs_process_add;

	(void) zpool_iter(g_zfshdl, zfs_iter_pool, &data);

	return (0);
	}

	static int
	zfsdle_vdev_online(zpool_handle_t zhp, void data)
	{
	char *devname = data;
	boolean_t avail_spare, l2cache;
	nvlist_t *tgt;
	int error;

	zed_log_msg(LOG_INFO, "zfsdle_vdev_online: searching for '%s' in '%s'",
	devname, zpool_get_name(zhp));

	if ((tgt = zpool_find_vdev_by_physpath(zhp, devname,
	&avail_spare, &l2cache, NULL)) != NULL) {
	char *path, fullpath[MAXPATHLEN];
	uint64_t wholedisk;

	error = nvlist_lookup_string(tgt, ZPOOL_CONFIG_PATH, &path);
	if (error) {
	zpool_close(zhp);
	return (0);
	}

	error = nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_WHOLE_DISK,
	&wholedisk);
	if (error)
	wholedisk = 0;

	if (wholedisk) {
	path = strrchr(path, '/');
	if (path != NULL) {
	path = zfs_strip_partition(path + 1);
	if (path == NULL) {
	zpool_close(zhp);
	return (0);
	}
	} else {
	zpool_close(zhp);
	return (0);
	}

	(void) strlcpy(fullpath, path, sizeof (fullpath));
	free(path);

	/*
	* We need to reopen the pool associated with this
	* device so that the kernel can update the size of
	* the expanded device. When expanding there is no
	* need to restart the scrub from the beginning.
	*/
	boolean_t scrub_restart = B_FALSE;
	(void) zpool_reopen_one(zhp, &scrub_restart);
	} else {
	(void) strlcpy(fullpath, path, sizeof (fullpath));
	}

	if (zpool_get_prop_int(zhp, ZPOOL_PROP_AUTOEXPAND, NULL)) {
	vdev_state_t newstate;

	if (zpool_get_state(zhp) != POOL_STATE_UNAVAIL) {
	error = zpool_vdev_online(zhp, fullpath, 0,
	&newstate);
	zed_log_msg(LOG_INFO, "zfsdle_vdev_online: "
	"setting device '%s' to ONLINE state "
	"in pool '%s': %d", fullpath,
	zpool_get_name(zhp), error);
	}
	}
	zpool_close(zhp);
	return (1);
	}
	zpool_close(zhp);
	return (0);
	}

	/*
	* This function handles the ESC_DEV_DLE device change event. Use the
	* provided vdev guid when looking up a disk or partition, when the guid
	* is not present assume the entire disk is owned by ZFS and append the
	* expected -part1 partition information then lookup by physical path.
	*/
	static int
	zfs_deliver_dle(nvlist_t *nvl)
	{
	char *devname, name[MAXPATHLEN];
	uint64_t guid;

	if (nvlist_lookup_uint64(nvl, ZFS_EV_VDEV_GUID, &guid) == 0) {
	sprintf(name, "%llu", (u_longlong_t)guid);
	} else if (nvlist_lookup_string(nvl, DEV_PHYS_PATH, &devname) == 0) {
	strlcpy(name, devname, MAXPATHLEN);
	zfs_append_partition(name, MAXPATHLEN);
	} else {
	zed_log_msg(LOG_INFO, "zfs_deliver_dle: no guid or physpath");
	}

	if (zpool_iter(g_zfshdl, zfsdle_vdev_online, name) != 1) {
	zed_log_msg(LOG_INFO, "zfs_deliver_dle: device '%s' not "
	"found", name);
	return (1);
	}

	return (0);
	}

	/*
	* syseventd daemon module event handler
	*
	* Handles syseventd daemon zfs device related events:
	*
	* EC_DEV_ADD.ESC_DISK
	* EC_DEV_STATUS.ESC_DEV_DLE
	* EC_ZFS.ESC_ZFS_VDEV_CHECK
	*
	* Note: assumes only one thread active at a time (not thread safe)
	*/
	static int
	zfs_slm_deliver_event(const char class, const char subclass, nvlist_t *nvl)
	{
	int ret;
	boolean_t is_lofi = B_FALSE, is_check = B_FALSE, is_dle = B_FALSE;

	if (strcmp(class, EC_DEV_ADD) == 0) {
	/*
	* We're mainly interested in disk additions, but we also listen
	* for new loop devices, to allow for simplified testing.
	*/
	if (strcmp(subclass, ESC_DISK) == 0)
	is_lofi = B_FALSE;
	else if (strcmp(subclass, ESC_LOFI) == 0)
	is_lofi = B_TRUE;
	else
	return (0);

	is_check = B_FALSE;
	} else if (strcmp(class, EC_ZFS) == 0 &&
	strcmp(subclass, ESC_ZFS_VDEV_CHECK) == 0) {
	/*
	* This event signifies that a device failed to open
	* during pool load, but the 'autoreplace' property was
	* set, so we should pretend it's just been added.
	*/
	is_check = B_TRUE;
	} else if (strcmp(class, EC_DEV_STATUS) == 0 &&
	strcmp(subclass, ESC_DEV_DLE) == 0) {
	is_dle = B_TRUE;
	} else {
	return (0);
	}

	if (is_dle)
	ret = zfs_deliver_dle(nvl);
	else if (is_check)
	ret = zfs_deliver_check(nvl);
	else
	ret = zfs_deliver_add(nvl, is_lofi);

	return (ret);
	}

	/ARGSUSED/
	static void *
	zfs_enum_pools(void *arg)
	{
	(void) zpool_iter(g_zfshdl, zfs_unavail_pool, (void *)&g_pool_list);
	/*
	* Linux - instead of using a thread pool, each list entry
	* will spawn a thread when an unavailable pool transitions
	* to available. zfs_slm_fini will wait for these threads.
	*/
	g_enumeration_done = B_TRUE;
	return (NULL);
	}

	/*
	* called from zed daemon at startup
	*
	* sent messages from zevents or udev monitor
	*
	* For now, each agent has its own libzfs instance
	*/
	int
	zfs_slm_init()
	{
	if ((g_zfshdl = libzfs_init()) == NULL)
	return (-1);

	/*
	* collect a list of unavailable pools (asynchronously,
	* since this can take a while)
	*/
	list_create(&g_pool_list, sizeof (struct unavailpool),
	offsetof(struct unavailpool, uap_node));

	if (pthread_create(&g_zfs_tid, NULL, zfs_enum_pools, NULL) != 0) {
	list_destroy(&g_pool_list);
	libzfs_fini(g_zfshdl);
	return (-1);
	}

	pthread_setname_np(g_zfs_tid, "enum-pools");
	list_create(&g_device_list, sizeof (struct pendingdev),
	offsetof(struct pendingdev, pd_node));

	return (0);
	}

	void
	zfs_slm_fini()
	{
	unavailpool_t *pool;
	pendingdev_t *device;

	/* wait for zfs_enum_pools thread to complete */
	(void) pthread_join(g_zfs_tid, NULL);
	/* destroy the thread pool */
	if (g_tpool != NULL) {
	tpool_wait(g_tpool);
	tpool_destroy(g_tpool);
	}

	while ((pool = (list_head(&g_pool_list))) != NULL) {
	list_remove(&g_pool_list, pool);
	zpool_close(pool->uap_zhp);
	free(pool);
	}
	list_destroy(&g_pool_list);

	while ((device = (list_head(&g_device_list))) != NULL) {
	list_remove(&g_device_list, device);
	free(device);
	}
	list_destroy(&g_device_list);

	libzfs_fini(g_zfshdl);
	}

	void
	zfs_slm_event(const char class, const char subclass, nvlist_t *nvl)
	{
	zed_log_msg(LOG_INFO, "zfs_slm_event: %s.%s", class, subclass);
	(void) zfs_slm_deliver_event(class, subclass, nvl);
	}
	diff --git a/sys/contrib/openzfs/cmd/zed/zed_disk_event.c b/sys/contrib/openzfs/cmd/zed/zed_disk_event.c
	index 6ec566cff3ca..94e24236063c 100644
	--- a/sys/contrib/openzfs/cmd/zed/zed_disk_event.c
	+++ b/sys/contrib/openzfs/cmd/zed/zed_disk_event.c
	@@ -1,417 +1,419 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License Version 1.0 (CDDL-1.0).
	* You can obtain a copy of the license from the top-level file
	* "OPENSOLARIS.LICENSE" or at <http://opensource.org/licenses/CDDL-1.0>.
	* You may not use this file except in compliance with the license.
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2016, 2017, Intel Corporation.
	*/

	#ifdef HAVE_LIBUDEV

	#include <errno.h>
	#include <fcntl.h>
	#include <libnvpair.h>
	#include <libudev.h>
	#include <libzfs.h>
	#include <libzutil.h>
	#include <pthread.h>
	#include <stdlib.h>
	#include <string.h>

	#include <sys/sysevent/eventdefs.h>
	#include <sys/sysevent/dev.h>

	#include "zed_log.h"
	#include "zed_disk_event.h"
	#include "agents/zfs_agents.h"

	/*
	* Portions of ZED need to see disk events for disks belonging to ZFS pools.
	* A libudev monitor is established to monitor block device actions and pass
	* them on to internal ZED logic modules. Initially, zfs_mod.c is the only
	* consumer and is the Linux equivalent for the illumos syseventd ZFS SLM
	* module responsible for handling disk events for ZFS.
	*/

	pthread_t g_mon_tid;
	struct udev *g_udev;
	struct udev_monitor *g_mon;


	#define DEV_BYID_PATH "/dev/disk/by-id/"

	/* 64MB is minimum usable disk for ZFS */
	#define MINIMUM_SECTORS 131072


	/*
	* Post disk event to SLM module
	*
	* occurs in the context of monitor thread
	*/
	static void
	zed_udev_event(const char class, const char subclass, nvlist_t *nvl)
	{
	char *strval;
	uint64_t numval;

	zed_log_msg(LOG_INFO, "zed_disk_event:");
	zed_log_msg(LOG_INFO, "\tclass: %s", class);
	zed_log_msg(LOG_INFO, "\tsubclass: %s", subclass);
	if (nvlist_lookup_string(nvl, DEV_NAME, &strval) == 0)
	zed_log_msg(LOG_INFO, "\t%s: %s", DEV_NAME, strval);
	if (nvlist_lookup_string(nvl, DEV_PATH, &strval) == 0)
	zed_log_msg(LOG_INFO, "\t%s: %s", DEV_PATH, strval);
	if (nvlist_lookup_string(nvl, DEV_IDENTIFIER, &strval) == 0)
	zed_log_msg(LOG_INFO, "\t%s: %s", DEV_IDENTIFIER, strval);
	+ if (nvlist_lookup_boolean(nvl, DEV_IS_PART) == B_TRUE)
	+ zed_log_msg(LOG_INFO, "\t%s: B_TRUE", DEV_IS_PART);
	if (nvlist_lookup_string(nvl, DEV_PHYS_PATH, &strval) == 0)
	zed_log_msg(LOG_INFO, "\t%s: %s", DEV_PHYS_PATH, strval);
	if (nvlist_lookup_uint64(nvl, DEV_SIZE, &numval) == 0)
	zed_log_msg(LOG_INFO, "\t%s: %llu", DEV_SIZE, numval);
	if (nvlist_lookup_uint64(nvl, ZFS_EV_POOL_GUID, &numval) == 0)
	zed_log_msg(LOG_INFO, "\t%s: %llu", ZFS_EV_POOL_GUID, numval);
	if (nvlist_lookup_uint64(nvl, ZFS_EV_VDEV_GUID, &numval) == 0)
	zed_log_msg(LOG_INFO, "\t%s: %llu", ZFS_EV_VDEV_GUID, numval);

	(void) zfs_agent_post_event(class, subclass, nvl);
	}

	/*
	* dev_event_nvlist: place event schema into an nv pair list
	*
	* NAME VALUE (example)
	* -------------- --------------------------------------------------------
	* DEV_NAME /dev/sdl
	* DEV_PATH /devices/pci0000:00/0000:00:03.0/0000:04:00.0/host0/...
	* DEV_IDENTIFIER ata-Hitachi_HTS725050A9A362_100601PCG420VLJ37DMC
	* DEV_PHYS_PATH pci-0000:04:00.0-sas-0x4433221101000000-lun-0
	* DEV_IS_PART ---
	* DEV_SIZE 500107862016
	* ZFS_EV_POOL_GUID 17523635698032189180
	* ZFS_EV_VDEV_GUID 14663607734290803088
	*/
	static nvlist_t *
	dev_event_nvlist(struct udev_device *dev)
	{
	nvlist_t *nvl;
	char strval[128];
	const char value, path;
	uint64_t guid;

	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
	return (NULL);

	if (zfs_device_get_devid(dev, strval, sizeof (strval)) == 0)
	(void) nvlist_add_string(nvl, DEV_IDENTIFIER, strval);
	if (zfs_device_get_physical(dev, strval, sizeof (strval)) == 0)
	(void) nvlist_add_string(nvl, DEV_PHYS_PATH, strval);
	if ((path = udev_device_get_devnode(dev)) != NULL)
	(void) nvlist_add_string(nvl, DEV_NAME, path);
	if ((value = udev_device_get_devpath(dev)) != NULL)
	(void) nvlist_add_string(nvl, DEV_PATH, value);
	value = udev_device_get_devtype(dev);
	if ((value != NULL && strcmp("partition", value) == 0) \|\|
	(udev_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER")
	!= NULL)) {
	(void) nvlist_add_boolean(nvl, DEV_IS_PART);
	}
	if ((value = udev_device_get_sysattr_value(dev, "size")) != NULL) {
	uint64_t numval = DEV_BSIZE;

	numval *= strtoull(value, NULL, 10);
	(void) nvlist_add_uint64(nvl, DEV_SIZE, numval);
	}

	/*
	* Grab the pool and vdev guids from blkid cache
	*/
	value = udev_device_get_property_value(dev, "ID_FS_UUID");
	if (value != NULL && (guid = strtoull(value, NULL, 10)) != 0)
	(void) nvlist_add_uint64(nvl, ZFS_EV_POOL_GUID, guid);

	value = udev_device_get_property_value(dev, "ID_FS_UUID_SUB");
	if (value != NULL && (guid = strtoull(value, NULL, 10)) != 0)
	(void) nvlist_add_uint64(nvl, ZFS_EV_VDEV_GUID, guid);

	/*
	* Either a vdev guid or a devid must be present for matching
	*/
	if (!nvlist_exists(nvl, DEV_IDENTIFIER) &&
	!nvlist_exists(nvl, ZFS_EV_VDEV_GUID)) {
	nvlist_free(nvl);
	return (NULL);
	}

	return (nvl);
	}

	/*
	* Listen for block device uevents
	*/
	static void *
	zed_udev_monitor(void *arg)
	{
	struct udev_monitor *mon = arg;
	char tmp, tmp2;

	zed_log_msg(LOG_INFO, "Waiting for new udev disk events...");

	while (1) {
	struct udev_device *dev;
	const char action, type, part, sectors;
	const char bus, uuid;
	const char class, subclass;
	nvlist_t *nvl;
	boolean_t is_zfs = B_FALSE;

	/* allow a cancellation while blocked (recvmsg) */
	pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);

	/* blocks at recvmsg until an event occurs */
	if ((dev = udev_monitor_receive_device(mon)) == NULL) {
	zed_log_msg(LOG_WARNING, "zed_udev_monitor: receive "
	"device error %d", errno);
	continue;
	}

	/* allow all steps to complete before a cancellation */
	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);

	/*
	* Strongly typed device is the preferred filter
	*/
	type = udev_device_get_property_value(dev, "ID_FS_TYPE");
	if (type != NULL && type[0] != '\0') {
	if (strcmp(type, "zfs_member") == 0) {
	is_zfs = B_TRUE;
	} else {
	/* not ours, so skip */
	zed_log_msg(LOG_INFO, "zed_udev_monitor: skip "
	"%s (in use by %s)",
	udev_device_get_devnode(dev), type);
	udev_device_unref(dev);
	continue;
	}
	}

	/*
	* if this is a disk and it is partitioned, then the
	* zfs label will reside in a DEVTYPE=partition and
	* we can skip passing this event
	*/
	type = udev_device_get_property_value(dev, "DEVTYPE");
	part = udev_device_get_property_value(dev,
	"ID_PART_TABLE_TYPE");
	if (type != NULL && type[0] != '\0' &&
	strcmp(type, "disk") == 0 &&
	part != NULL && part[0] != '\0') {
	/* skip and wait for partition event */
	udev_device_unref(dev);
	continue;
	}

	/*
	* ignore small partitions
	*/
	sectors = udev_device_get_property_value(dev,
	"ID_PART_ENTRY_SIZE");
	if (sectors == NULL)
	sectors = udev_device_get_sysattr_value(dev, "size");
	if (sectors != NULL &&
	strtoull(sectors, NULL, 10) < MINIMUM_SECTORS) {
	udev_device_unref(dev);
	continue;
	}

	/*
	* If the blkid probe didn't find ZFS, then a persistent
	* device id string is required in the message schema
	* for matching with vdevs. Preflight here for expected
	* udev information.
	*/
	bus = udev_device_get_property_value(dev, "ID_BUS");
	uuid = udev_device_get_property_value(dev, "DM_UUID");
	if (!is_zfs && (bus == NULL && uuid == NULL)) {
	zed_log_msg(LOG_INFO, "zed_udev_monitor: %s no devid "
	"source", udev_device_get_devnode(dev));
	udev_device_unref(dev);
	continue;
	}

	action = udev_device_get_action(dev);
	if (strcmp(action, "add") == 0) {
	class = EC_DEV_ADD;
	subclass = ESC_DISK;
	} else if (strcmp(action, "remove") == 0) {
	class = EC_DEV_REMOVE;
	subclass = ESC_DISK;
	} else if (strcmp(action, "change") == 0) {
	class = EC_DEV_STATUS;
	subclass = ESC_DEV_DLE;
	} else {
	zed_log_msg(LOG_WARNING, "zed_udev_monitor: %s unknown",
	action);
	udev_device_unref(dev);
	continue;
	}

	/*
	* Special case an EC_DEV_ADD for multipath devices
	*
	* When a multipath device is created, udev reports the
	* following:
	*
	* 1. "add" event of the dm device for the multipath device
	* (like /dev/dm-3).
	* 2. "change" event to create the actual multipath device
	* symlink (like /dev/mapper/mpatha). The event also
	* passes back the relevant DM vars we care about, like
	* DM_UUID.
	* 3. Another "change" event identical to #2 (that we ignore).
	*
	* To get the behavior we want, we treat the "change" event
	* in #2 as a "add" event; as if "/dev/mapper/mpatha" was
	* a new disk being added.
	*/
	if (strcmp(class, EC_DEV_STATUS) == 0 &&
	udev_device_get_property_value(dev, "DM_UUID") &&
	udev_device_get_property_value(dev, "MPATH_SBIN_PATH")) {
	tmp = (char *)udev_device_get_devnode(dev);
	tmp2 = zfs_get_underlying_path(tmp);
	if (tmp && tmp2 && (strcmp(tmp, tmp2) != 0)) {
	/*
	* We have a real underlying device, which
	* means that this multipath "change" event is
	* an "add" event.
	*
	* If the multipath device and the underlying
	* dev are the same name (i.e. /dev/dm-5), then
	* there is no real underlying disk for this
	* multipath device, and so this "change" event
	* really is a multipath removal.
	*/
	class = EC_DEV_ADD;
	subclass = ESC_DISK;
	} else {
	tmp = (char *)
	udev_device_get_property_value(dev,
	"DM_NR_VALID_PATHS");
	/* treat as a multipath remove */
	if (tmp != NULL && strcmp(tmp, "0") == 0) {
	class = EC_DEV_REMOVE;
	subclass = ESC_DISK;
	}
	}
	free(tmp2);
	}

	/*
	* Special case an EC_DEV_ADD for scsi_debug devices
	*
	* These devices require a udevadm trigger command after
	* creation in order to register the vdev_id scsidebug alias
	* rule (adds a persistent path (phys_path) used for fault
	* management automated tests in the ZFS test suite.
	*
	* After udevadm trigger command, event registers as a "change"
	* event but needs to instead be handled as another "add" event
	* to allow for disk labeling and partitioning to occur.
	*/
	if (strcmp(class, EC_DEV_STATUS) == 0 &&
	udev_device_get_property_value(dev, "ID_VDEV") &&
	udev_device_get_property_value(dev, "ID_MODEL")) {
	const char id_model, id_model_sd = "scsi_debug";

	id_model = udev_device_get_property_value(dev,
	"ID_MODEL");
	if (strcmp(id_model, id_model_sd) == 0) {
	class = EC_DEV_ADD;
	subclass = ESC_DISK;
	}
	}

	if ((nvl = dev_event_nvlist(dev)) != NULL) {
	zed_udev_event(class, subclass, nvl);
	nvlist_free(nvl);
	}

	udev_device_unref(dev);
	}

	return (NULL);
	}

	int
	zed_disk_event_init()
	{
	int fd, fflags;

	if ((g_udev = udev_new()) == NULL) {
	zed_log_msg(LOG_WARNING, "udev_new failed (%d)", errno);
	return (-1);
	}

	/* Set up a udev monitor for block devices */
	g_mon = udev_monitor_new_from_netlink(g_udev, "udev");
	udev_monitor_filter_add_match_subsystem_devtype(g_mon, "block", "disk");
	udev_monitor_filter_add_match_subsystem_devtype(g_mon, "block",
	"partition");
	udev_monitor_enable_receiving(g_mon);

	/* Make sure monitoring socket is blocking */
	fd = udev_monitor_get_fd(g_mon);
	if ((fflags = fcntl(fd, F_GETFL)) & O_NONBLOCK)
	(void) fcntl(fd, F_SETFL, fflags & ~O_NONBLOCK);

	/* spawn a thread to monitor events */
	if (pthread_create(&g_mon_tid, NULL, zed_udev_monitor, g_mon) != 0) {
	udev_monitor_unref(g_mon);
	udev_unref(g_udev);
	zed_log_msg(LOG_WARNING, "pthread_create failed");
	return (-1);
	}

	pthread_setname_np(g_mon_tid, "udev monitor");
	zed_log_msg(LOG_INFO, "zed_disk_event_init");

	return (0);
	}

	void
	zed_disk_event_fini()
	{
	/* cancel monitor thread at recvmsg() */
	(void) pthread_cancel(g_mon_tid);
	(void) pthread_join(g_mon_tid, NULL);

	/* cleanup udev resources */
	udev_monitor_unref(g_mon);
	udev_unref(g_udev);

	zed_log_msg(LOG_INFO, "zed_disk_event_fini");
	}

	#else

	#include "zed_disk_event.h"

	int
	zed_disk_event_init()
	{
	return (0);
	}

	void
	zed_disk_event_fini()
	{
	}

	#endif /* HAVE_LIBUDEV */
	diff --git a/sys/contrib/openzfs/cmd/zfs/zfs_main.c b/sys/contrib/openzfs/cmd/zfs/zfs_main.c
	index cabf7189223b..7806d86398a9 100644
	--- a/sys/contrib/openzfs/cmd/zfs/zfs_main.c
	+++ b/sys/contrib/openzfs/cmd/zfs/zfs_main.c
	@@ -1,8802 +1,8802 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	* Copyright 2012 Milan Jurik. All rights reserved.
	* Copyright (c) 2012, Joyent, Inc. All rights reserved.
	* Copyright (c) 2013 Steven Hartland. All rights reserved.
	* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
	* Copyright 2016 Nexenta Systems, Inc.
	* Copyright (c) 2019 Datto Inc.
	* Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>
	* Copyright 2019 Joyent, Inc.
	* Copyright (c) 2019, 2020 by Christian Schwarz. All rights reserved.
	*/

	#include <assert.h>
	#include <ctype.h>
	#include <sys/debug.h>
	#include <errno.h>
	#include <getopt.h>
	#include <libgen.h>
	#include <libintl.h>
	#include <libuutil.h>
	#include <libnvpair.h>
	#include <locale.h>
	#include <stddef.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <strings.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <zone.h>
	#include <grp.h>
	#include <pwd.h>
	#include <signal.h>
	#include <sys/list.h>
	#include <sys/mkdev.h>
	#include <sys/mntent.h>
	#include <sys/mnttab.h>
	#include <sys/mount.h>
	#include <sys/stat.h>
	#include <sys/fs/zfs.h>
	#include <sys/systeminfo.h>
	#include <sys/types.h>
	#include <time.h>
	#include <sys/zfs_project.h>

	#include <libzfs.h>
	#include <libzfs_core.h>
	#include <zfs_prop.h>
	#include <zfs_deleg.h>
	#include <libzutil.h>
	#ifdef HAVE_IDMAP
	#include <aclutils.h>
	#include <directory.h>
	#endif /* HAVE_IDMAP */

	#include "zfs_iter.h"
	#include "zfs_util.h"
	#include "zfs_comutil.h"
	#include "libzfs_impl.h"
	#include "zfs_projectutil.h"

	libzfs_handle_t *g_zfs;

	static FILE *mnttab_file;
	static char history_str[HIS_MAX_RECORD_LEN];
	static boolean_t log_history = B_TRUE;

	static int zfs_do_clone(int argc, char **argv);
	static int zfs_do_create(int argc, char **argv);
	static int zfs_do_destroy(int argc, char **argv);
	static int zfs_do_get(int argc, char **argv);
	static int zfs_do_inherit(int argc, char **argv);
	static int zfs_do_list(int argc, char **argv);
	static int zfs_do_mount(int argc, char **argv);
	static int zfs_do_rename(int argc, char **argv);
	static int zfs_do_rollback(int argc, char **argv);
	static int zfs_do_set(int argc, char **argv);
	static int zfs_do_upgrade(int argc, char **argv);
	static int zfs_do_snapshot(int argc, char **argv);
	static int zfs_do_unmount(int argc, char **argv);
	static int zfs_do_share(int argc, char **argv);
	static int zfs_do_unshare(int argc, char **argv);
	static int zfs_do_send(int argc, char **argv);
	static int zfs_do_receive(int argc, char **argv);
	static int zfs_do_promote(int argc, char **argv);
	static int zfs_do_userspace(int argc, char **argv);
	static int zfs_do_allow(int argc, char **argv);
	static int zfs_do_unallow(int argc, char **argv);
	static int zfs_do_hold(int argc, char **argv);
	static int zfs_do_holds(int argc, char **argv);
	static int zfs_do_release(int argc, char **argv);
	static int zfs_do_diff(int argc, char **argv);
	static int zfs_do_bookmark(int argc, char **argv);
	static int zfs_do_channel_program(int argc, char **argv);
	static int zfs_do_load_key(int argc, char **argv);
	static int zfs_do_unload_key(int argc, char **argv);
	static int zfs_do_change_key(int argc, char **argv);
	static int zfs_do_project(int argc, char **argv);
	static int zfs_do_version(int argc, char **argv);
	static int zfs_do_redact(int argc, char **argv);
	static int zfs_do_wait(int argc, char **argv);

	#ifdef __FreeBSD__
	static int zfs_do_jail(int argc, char **argv);
	static int zfs_do_unjail(int argc, char **argv);
	#endif

	/*
	* Enable a reasonable set of defaults for libumem debugging on DEBUG builds.
	*/

	#ifdef DEBUG
	const char *
	_umem_debug_init(void)
	{
	return ("default,verbose"); /* $UMEM_DEBUG setting */
	}

	const char *
	_umem_logging_init(void)
	{
	return ("fail,contents"); /* $UMEM_LOGGING setting */
	}
	#endif

	typedef enum {
	HELP_CLONE,
	HELP_CREATE,
	HELP_DESTROY,
	HELP_GET,
	HELP_INHERIT,
	HELP_UPGRADE,
	HELP_LIST,
	HELP_MOUNT,
	HELP_PROMOTE,
	HELP_RECEIVE,
	HELP_RENAME,
	HELP_ROLLBACK,
	HELP_SEND,
	HELP_SET,
	HELP_SHARE,
	HELP_SNAPSHOT,
	HELP_UNMOUNT,
	HELP_UNSHARE,
	HELP_ALLOW,
	HELP_UNALLOW,
	HELP_USERSPACE,
	HELP_GROUPSPACE,
	HELP_PROJECTSPACE,
	HELP_PROJECT,
	HELP_HOLD,
	HELP_HOLDS,
	HELP_RELEASE,
	HELP_DIFF,
	HELP_BOOKMARK,
	HELP_CHANNEL_PROGRAM,
	HELP_LOAD_KEY,
	HELP_UNLOAD_KEY,
	HELP_CHANGE_KEY,
	HELP_VERSION,
	HELP_REDACT,
	HELP_JAIL,
	HELP_UNJAIL,
	HELP_WAIT,
	} zfs_help_t;

	typedef struct zfs_command {
	const char *name;
	int (func)(int argc, char *argv);
	zfs_help_t usage;
	} zfs_command_t;

	/*
	* Master command table. Each ZFS command has a name, associated function, and
	* usage message. The usage messages need to be internationalized, so we have
	* to have a function to return the usage message based on a command index.
	*
	* These commands are organized according to how they are displayed in the usage
	* message. An empty command (one with a NULL name) indicates an empty line in
	* the generic usage message.
	*/
	static zfs_command_t command_table[] = {
	{ "version", zfs_do_version, HELP_VERSION },
	{ NULL },
	{ "create", zfs_do_create, HELP_CREATE },
	{ "destroy", zfs_do_destroy, HELP_DESTROY },
	{ NULL },
	{ "snapshot", zfs_do_snapshot, HELP_SNAPSHOT },
	{ "rollback", zfs_do_rollback, HELP_ROLLBACK },
	{ "clone", zfs_do_clone, HELP_CLONE },
	{ "promote", zfs_do_promote, HELP_PROMOTE },
	{ "rename", zfs_do_rename, HELP_RENAME },
	{ "bookmark", zfs_do_bookmark, HELP_BOOKMARK },
	{ "program", zfs_do_channel_program, HELP_CHANNEL_PROGRAM },
	{ NULL },
	{ "list", zfs_do_list, HELP_LIST },
	{ NULL },
	{ "set", zfs_do_set, HELP_SET },
	{ "get", zfs_do_get, HELP_GET },
	{ "inherit", zfs_do_inherit, HELP_INHERIT },
	{ "upgrade", zfs_do_upgrade, HELP_UPGRADE },
	{ NULL },
	{ "userspace", zfs_do_userspace, HELP_USERSPACE },
	{ "groupspace", zfs_do_userspace, HELP_GROUPSPACE },
	{ "projectspace", zfs_do_userspace, HELP_PROJECTSPACE },
	{ NULL },
	{ "project", zfs_do_project, HELP_PROJECT },
	{ NULL },
	{ "mount", zfs_do_mount, HELP_MOUNT },
	{ "unmount", zfs_do_unmount, HELP_UNMOUNT },
	{ "share", zfs_do_share, HELP_SHARE },
	{ "unshare", zfs_do_unshare, HELP_UNSHARE },
	{ NULL },
	{ "send", zfs_do_send, HELP_SEND },
	{ "receive", zfs_do_receive, HELP_RECEIVE },
	{ NULL },
	{ "allow", zfs_do_allow, HELP_ALLOW },
	{ NULL },
	{ "unallow", zfs_do_unallow, HELP_UNALLOW },
	{ NULL },
	{ "hold", zfs_do_hold, HELP_HOLD },
	{ "holds", zfs_do_holds, HELP_HOLDS },
	{ "release", zfs_do_release, HELP_RELEASE },
	{ "diff", zfs_do_diff, HELP_DIFF },
	{ "load-key", zfs_do_load_key, HELP_LOAD_KEY },
	{ "unload-key", zfs_do_unload_key, HELP_UNLOAD_KEY },
	{ "change-key", zfs_do_change_key, HELP_CHANGE_KEY },
	{ "redact", zfs_do_redact, HELP_REDACT },
	{ "wait", zfs_do_wait, HELP_WAIT },

	#ifdef __FreeBSD__
	{ "jail", zfs_do_jail, HELP_JAIL },
	{ "unjail", zfs_do_unjail, HELP_UNJAIL },
	#endif
	};

	#define NCOMMAND (sizeof (command_table) / sizeof (command_table[0]))

	zfs_command_t *current_command;

	static const char *
	get_usage(zfs_help_t idx)
	{
	switch (idx) {
	case HELP_CLONE:
	return (gettext("\tclone [-p] [-o property=value] ... "
	"<snapshot> <filesystem\|volume>\n"));
	case HELP_CREATE:
	return (gettext("\tcreate [-Pnpuv] [-o property=value] ... "
	"<filesystem>\n"
	"\tcreate [-Pnpsv] [-b blocksize] [-o property=value] ... "
	"-V <size> <volume>\n"));
	case HELP_DESTROY:
	return (gettext("\tdestroy [-fnpRrv] <filesystem\|volume>\n"
	"\tdestroy [-dnpRrv] "
	"<filesystem\|volume>@<snap>[%<snap>][,...]\n"
	"\tdestroy <filesystem\|volume>#<bookmark>\n"));
	case HELP_GET:
	return (gettext("\tget [-rHp] [-d max] "
	"[-o \"all\" \| field[,...]]\n"
	"\t [-t type[,...]] [-s source[,...]]\n"
	"\t <\"all\" \| property[,...]> "
	"[filesystem\|volume\|snapshot\|bookmark] ...\n"));
	case HELP_INHERIT:
	return (gettext("\tinherit [-rS] <property> "
	"<filesystem\|volume\|snapshot> ...\n"));
	case HELP_UPGRADE:
	return (gettext("\tupgrade [-v]\n"
	"\tupgrade [-r] [-V version] <-a \| filesystem ...>\n"));
	case HELP_LIST:
	return (gettext("\tlist [-Hp] [-r\|-d max] [-o property[,...]] "
	"[-s property]...\n\t [-S property]... [-t type[,...]] "
	"[filesystem\|volume\|snapshot] ...\n"));
	case HELP_MOUNT:
	return (gettext("\tmount\n"
	"\tmount [-flvO] [-o opts] <-a \| filesystem>\n"));
	case HELP_PROMOTE:
	return (gettext("\tpromote <clone-filesystem>\n"));
	case HELP_RECEIVE:
	return (gettext("\treceive [-vMnsFhu] "
	"[-o <property>=<value>] ... [-x <property>] ...\n"
	"\t <filesystem\|volume\|snapshot>\n"
	"\treceive [-vMnsFhu] [-o <property>=<value>] ... "
	"[-x <property>] ... \n"
	"\t [-d \| -e] <filesystem>\n"
	"\treceive -A <filesystem\|volume>\n"));
	case HELP_RENAME:
	return (gettext("\trename [-f] <filesystem\|volume\|snapshot> "
	"<filesystem\|volume\|snapshot>\n"
	"\trename -p [-f] <filesystem\|volume> <filesystem\|volume>\n"
	"\trename -u [-f] <filesystem> <filesystem>\n"
	"\trename -r <snapshot> <snapshot>\n"));
	case HELP_ROLLBACK:
	return (gettext("\trollback [-rRf] <snapshot>\n"));
	case HELP_SEND:
	return (gettext("\tsend [-DnPpRvLecwhb] [-[i\|I] snapshot] "
	"<snapshot>\n"
	- "\tsend [-nvPLecw] [-i snapshot\|bookmark] "
	+ "\tsend [-DnvPLecw] [-i snapshot\|bookmark] "
	"<filesystem\|volume\|snapshot>\n"
	"\tsend [-DnPpvLec] [-i bookmark\|snapshot] "
	"--redact <bookmark> <snapshot>\n"
	"\tsend [-nvPe] -t <receive_resume_token>\n"
	"\tsend [-Pnv] --saved filesystem\n"));
	case HELP_SET:
	return (gettext("\tset <property=value> ... "
	"<filesystem\|volume\|snapshot> ...\n"));
	case HELP_SHARE:
	return (gettext("\tshare [-l] <-a [nfs\|smb] \| filesystem>\n"));
	case HELP_SNAPSHOT:
	return (gettext("\tsnapshot [-r] [-o property=value] ... "
	"<filesystem\|volume>@<snap> ...\n"));
	case HELP_UNMOUNT:
	return (gettext("\tunmount [-fu] "
	"<-a \| filesystem\|mountpoint>\n"));
	case HELP_UNSHARE:
	return (gettext("\tunshare "
	"<-a [nfs\|smb] \| filesystem\|mountpoint>\n"));
	case HELP_ALLOW:
	return (gettext("\tallow <filesystem\|volume>\n"
	"\tallow [-ldug] "
	"<\"everyone\"\|user\|group>[,...] <perm\|@setname>[,...]\n"
	"\t <filesystem\|volume>\n"
	"\tallow [-ld] -e <perm\|@setname>[,...] "
	"<filesystem\|volume>\n"
	"\tallow -c <perm\|@setname>[,...] <filesystem\|volume>\n"
	"\tallow -s @setname <perm\|@setname>[,...] "
	"<filesystem\|volume>\n"));
	case HELP_UNALLOW:
	return (gettext("\tunallow [-rldug] "
	"<\"everyone\"\|user\|group>[,...]\n"
	"\t [<perm\|@setname>[,...]] <filesystem\|volume>\n"
	"\tunallow [-rld] -e [<perm\|@setname>[,...]] "
	"<filesystem\|volume>\n"
	"\tunallow [-r] -c [<perm\|@setname>[,...]] "
	"<filesystem\|volume>\n"
	"\tunallow [-r] -s @setname [<perm\|@setname>[,...]] "
	"<filesystem\|volume>\n"));
	case HELP_USERSPACE:
	return (gettext("\tuserspace [-Hinp] [-o field[,...]] "
	"[-s field] ...\n"
	"\t [-S field] ... [-t type[,...]] "
	"<filesystem\|snapshot\|path>\n"));
	case HELP_GROUPSPACE:
	return (gettext("\tgroupspace [-Hinp] [-o field[,...]] "
	"[-s field] ...\n"
	"\t [-S field] ... [-t type[,...]] "
	"<filesystem\|snapshot\|path>\n"));
	case HELP_PROJECTSPACE:
	return (gettext("\tprojectspace [-Hp] [-o field[,...]] "
	"[-s field] ... \n"
	"\t [-S field] ... <filesystem\|snapshot\|path>\n"));
	case HELP_PROJECT:
	return (gettext("\tproject [-d\|-r] <directory\|file ...>\n"
	"\tproject -c [-0] [-d\|-r] [-p id] <directory\|file ...>\n"
	"\tproject -C [-k] [-r] <directory ...>\n"
	"\tproject [-p id] [-r] [-s] <directory ...>\n"));
	case HELP_HOLD:
	return (gettext("\thold [-r] <tag> <snapshot> ...\n"));
	case HELP_HOLDS:
	return (gettext("\tholds [-rH] <snapshot> ...\n"));
	case HELP_RELEASE:
	return (gettext("\trelease [-r] <tag> <snapshot> ...\n"));
	case HELP_DIFF:
	return (gettext("\tdiff [-FHt] <snapshot> "
	"[snapshot\|filesystem]\n"));
	case HELP_BOOKMARK:
	return (gettext("\tbookmark <snapshot\|bookmark> "
	"<newbookmark>\n"));
	case HELP_CHANNEL_PROGRAM:
	return (gettext("\tprogram [-jn] [-t <instruction limit>] "
	"[-m <memory limit (b)>]\n"
	"\t <pool> <program file> [lua args...]\n"));
	case HELP_LOAD_KEY:
	return (gettext("\tload-key [-rn] [-L <keylocation>] "
	"<-a \| filesystem\|volume>\n"));
	case HELP_UNLOAD_KEY:
	return (gettext("\tunload-key [-r] "
	"<-a \| filesystem\|volume>\n"));
	case HELP_CHANGE_KEY:
	return (gettext("\tchange-key [-l] [-o keyformat=<value>]\n"
	"\t [-o keylocation=<value>] [-o pbkdf2iters=<value>]\n"
	"\t <filesystem\|volume>\n"
	"\tchange-key -i [-l] <filesystem\|volume>\n"));
	case HELP_VERSION:
	return (gettext("\tversion\n"));
	case HELP_REDACT:
	return (gettext("\tredact <snapshot> <bookmark> "
	"<redaction_snapshot> ...\n"));
	case HELP_JAIL:
	return (gettext("\tjail <jailid\|jailname> <filesystem>\n"));
	case HELP_UNJAIL:
	return (gettext("\tunjail <jailid\|jailname> <filesystem>\n"));
	case HELP_WAIT:
	return (gettext("\twait [-t <activity>] <filesystem>\n"));
	}

	abort();
	/* NOTREACHED */
	}

	void
	nomem(void)
	{
	(void) fprintf(stderr, gettext("internal error: out of memory\n"));
	exit(1);
	}

	/*
	* Utility function to guarantee malloc() success.
	*/

	void *
	safe_malloc(size_t size)
	{
	void *data;

	if ((data = calloc(1, size)) == NULL)
	nomem();

	return (data);
	}

	static void *
	safe_realloc(void *data, size_t size)
	{
	void *newp;
	if ((newp = realloc(data, size)) == NULL) {
	free(data);
	nomem();
	}

	return (newp);
	}

	static char *
	safe_strdup(char *str)
	{
	char *dupstr = strdup(str);

	if (dupstr == NULL)
	nomem();

	return (dupstr);
	}

	/*
	* Callback routine that will print out information for each of
	* the properties.
	*/
	static int
	usage_prop_cb(int prop, void *cb)
	{
	FILE *fp = cb;

	(void) fprintf(fp, "\t%-15s ", zfs_prop_to_name(prop));

	if (zfs_prop_readonly(prop))
	(void) fprintf(fp, " NO ");
	else
	(void) fprintf(fp, "YES ");

	if (zfs_prop_inheritable(prop))
	(void) fprintf(fp, " YES ");
	else
	(void) fprintf(fp, " NO ");

	if (zfs_prop_values(prop) == NULL)
	(void) fprintf(fp, "-\n");
	else
	(void) fprintf(fp, "%s\n", zfs_prop_values(prop));

	return (ZPROP_CONT);
	}

	/*
	* Display usage message. If we're inside a command, display only the usage for
	* that command. Otherwise, iterate over the entire command table and display
	* a complete usage message.
	*/
	static void
	usage(boolean_t requested)
	{
	int i;
	boolean_t show_properties = B_FALSE;
	FILE *fp = requested ? stdout : stderr;

	if (current_command == NULL) {

	(void) fprintf(fp, gettext("usage: zfs command args ...\n"));
	(void) fprintf(fp,
	gettext("where 'command' is one of the following:\n\n"));

	for (i = 0; i < NCOMMAND; i++) {
	if (command_table[i].name == NULL)
	(void) fprintf(fp, "\n");
	else
	(void) fprintf(fp, "%s",
	get_usage(command_table[i].usage));
	}

	(void) fprintf(fp, gettext("\nEach dataset is of the form: "
	"pool/[dataset/]*dataset[@name]\n"));
	} else {
	(void) fprintf(fp, gettext("usage:\n"));
	(void) fprintf(fp, "%s", get_usage(current_command->usage));
	}

	if (current_command != NULL &&
	(strcmp(current_command->name, "set") == 0 \|\|
	strcmp(current_command->name, "get") == 0 \|\|
	strcmp(current_command->name, "inherit") == 0 \|\|
	strcmp(current_command->name, "list") == 0))
	show_properties = B_TRUE;

	if (show_properties) {
	(void) fprintf(fp,
	gettext("\nThe following properties are supported:\n"));

	(void) fprintf(fp, "\n\t%-14s %s %s %s\n\n",
	"PROPERTY", "EDIT", "INHERIT", "VALUES");

	/* Iterate over all properties */
	(void) zprop_iter(usage_prop_cb, fp, B_FALSE, B_TRUE,
	ZFS_TYPE_DATASET);

	(void) fprintf(fp, "\t%-15s ", "userused@...");
	(void) fprintf(fp, " NO NO <size>\n");
	(void) fprintf(fp, "\t%-15s ", "groupused@...");
	(void) fprintf(fp, " NO NO <size>\n");
	(void) fprintf(fp, "\t%-15s ", "projectused@...");
	(void) fprintf(fp, " NO NO <size>\n");
	(void) fprintf(fp, "\t%-15s ", "userobjused@...");
	(void) fprintf(fp, " NO NO <size>\n");
	(void) fprintf(fp, "\t%-15s ", "groupobjused@...");
	(void) fprintf(fp, " NO NO <size>\n");
	(void) fprintf(fp, "\t%-15s ", "projectobjused@...");
	(void) fprintf(fp, " NO NO <size>\n");
	(void) fprintf(fp, "\t%-15s ", "userquota@...");
	(void) fprintf(fp, "YES NO <size> \| none\n");
	(void) fprintf(fp, "\t%-15s ", "groupquota@...");
	(void) fprintf(fp, "YES NO <size> \| none\n");
	(void) fprintf(fp, "\t%-15s ", "projectquota@...");
	(void) fprintf(fp, "YES NO <size> \| none\n");
	(void) fprintf(fp, "\t%-15s ", "userobjquota@...");
	(void) fprintf(fp, "YES NO <size> \| none\n");
	(void) fprintf(fp, "\t%-15s ", "groupobjquota@...");
	(void) fprintf(fp, "YES NO <size> \| none\n");
	(void) fprintf(fp, "\t%-15s ", "projectobjquota@...");
	(void) fprintf(fp, "YES NO <size> \| none\n");
	(void) fprintf(fp, "\t%-15s ", "written@<snap>");
	(void) fprintf(fp, " NO NO <size>\n");
	(void) fprintf(fp, "\t%-15s ", "written#<bookmark>");
	(void) fprintf(fp, " NO NO <size>\n");

	(void) fprintf(fp, gettext("\nSizes are specified in bytes "
	"with standard units such as K, M, G, etc.\n"));
	(void) fprintf(fp, gettext("\nUser-defined properties can "
	"be specified by using a name containing a colon (:).\n"));
	(void) fprintf(fp, gettext("\nThe {user\|group\|project}"
	"[obj]{used\|quota}@ properties must be appended with\n"
	"a user\|group\|project specifier of one of these forms:\n"
	" POSIX name (eg: \"matt\")\n"
	" POSIX id (eg: \"126829\")\n"
	" SMB name@domain (eg: \"matt@sun\")\n"
	" SMB SID (eg: \"S-1-234-567-89\")\n"));
	} else {
	(void) fprintf(fp,
	gettext("\nFor the property list, run: %s\n"),
	"zfs set\|get");
	(void) fprintf(fp,
	gettext("\nFor the delegated permission list, run: %s\n"),
	"zfs allow\|unallow");
	}

	/*
	* See comments at end of main().
	*/
	if (getenv("ZFS_ABORT") != NULL) {
	(void) printf("dumping core by request\n");
	abort();
	}

	exit(requested ? 0 : 2);
	}

	/*
	* Take a property=value argument string and add it to the given nvlist.
	* Modifies the argument inplace.
	*/
	static boolean_t
	parseprop(nvlist_t props, char propname)
	{
	char *propval;

	if ((propval = strchr(propname, '=')) == NULL) {
	(void) fprintf(stderr, gettext("missing "
	"'=' for property=value argument\n"));
	return (B_FALSE);
	}
	*propval = '\0';
	propval++;
	if (nvlist_exists(props, propname)) {
	(void) fprintf(stderr, gettext("property '%s' "
	"specified multiple times\n"), propname);
	return (B_FALSE);
	}
	if (nvlist_add_string(props, propname, propval) != 0)
	nomem();
	return (B_TRUE);
	}

	/*
	* Take a property name argument and add it to the given nvlist.
	* Modifies the argument inplace.
	*/
	static boolean_t
	parsepropname(nvlist_t props, char propname)
	{
	if (strchr(propname, '=') != NULL) {
	(void) fprintf(stderr, gettext("invalid character "
	"'=' in property argument\n"));
	return (B_FALSE);
	}
	if (nvlist_exists(props, propname)) {
	(void) fprintf(stderr, gettext("property '%s' "
	"specified multiple times\n"), propname);
	return (B_FALSE);
	}
	if (nvlist_add_boolean(props, propname) != 0)
	nomem();
	return (B_TRUE);
	}

	static int
	parse_depth(char opt, int flags)
	{
	char *tmp;
	int depth;

	depth = (int)strtol(opt, &tmp, 0);
	if (*tmp) {
	(void) fprintf(stderr,
	gettext("%s is not an integer\n"), optarg);
	usage(B_FALSE);
	}
	if (depth < 0) {
	(void) fprintf(stderr,
	gettext("Depth can not be negative.\n"));
	usage(B_FALSE);
	}
	*flags \|= (ZFS_ITER_DEPTH_LIMIT\|ZFS_ITER_RECURSE);
	return (depth);
	}

	#define PROGRESS_DELAY 2 /* seconds */

	static char *pt_reverse = "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b";
	static time_t pt_begin;
	static char *pt_header = NULL;
	static boolean_t pt_shown;

	static void
	start_progress_timer(void)
	{
	pt_begin = time(NULL) + PROGRESS_DELAY;
	pt_shown = B_FALSE;
	}

	static void
	set_progress_header(char *header)
	{
	assert(pt_header == NULL);
	pt_header = safe_strdup(header);
	if (pt_shown) {
	(void) printf("%s: ", header);
	(void) fflush(stdout);
	}
	}

	static void
	update_progress(char *update)
	{
	if (!pt_shown && time(NULL) > pt_begin) {
	int len = strlen(update);

	(void) printf("%s: %s%.s", pt_header, update, len, len,
	pt_reverse);
	(void) fflush(stdout);
	pt_shown = B_TRUE;
	} else if (pt_shown) {
	int len = strlen(update);

	(void) printf("%s%.s", update, len, len, pt_reverse);
	(void) fflush(stdout);
	}
	}

	static void
	finish_progress(char *done)
	{
	if (pt_shown) {
	(void) printf("%s\n", done);
	(void) fflush(stdout);
	}
	free(pt_header);
	pt_header = NULL;
	}

	/* This function checks if the passed fd refers to /dev/null or /dev/zero */
	#ifdef __linux__
	static boolean_t
	is_dev_nullzero(int fd)
	{
	struct stat st;
	fstat(fd, &st);
	return (major(st.st_rdev) == 1 && (minor(st.st_rdev) == 3 /* null */ \|\|
	minor(st.st_rdev) == 5 /* zero */));
	}
	#endif

	static void
	note_dev_error(int err, int fd)
	{
	#ifdef __linux__
	if (err == EINVAL && is_dev_nullzero(fd)) {
	(void) fprintf(stderr,
	gettext("Error: Writing directly to /dev/{null,zero} files"
	" on certain kernels is not currently implemented.\n"
	"(As a workaround, "
	"try \"zfs send [...] \| cat > /dev/null\")\n"));
	}
	#endif
	}

	static int
	zfs_mount_and_share(libzfs_handle_t hdl, const char dataset, zfs_type_t type)
	{
	zfs_handle_t *zhp = NULL;
	int ret = 0;

	zhp = zfs_open(hdl, dataset, type);
	if (zhp == NULL)
	return (1);

	/*
	* Volumes may neither be mounted or shared. Potentially in the
	* future filesystems detected on these volumes could be mounted.
	*/
	if (zfs_get_type(zhp) == ZFS_TYPE_VOLUME) {
	zfs_close(zhp);
	return (0);
	}

	/*
	* Mount and/or share the new filesystem as appropriate. We provide a
	* verbose error message to let the user know that their filesystem was
	* in fact created, even if we failed to mount or share it.
	*
	* If the user doesn't want the dataset automatically mounted, then
	* skip the mount/share step
	*/
	if (zfs_prop_valid_for_type(ZFS_PROP_CANMOUNT, type, B_FALSE) &&
	zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON) {
	if (zfs_mount_delegation_check()) {
	(void) fprintf(stderr, gettext("filesystem "
	"successfully created, but it may only be "
	"mounted by root\n"));
	ret = 1;
	} else if (zfs_mount(zhp, NULL, 0) != 0) {
	(void) fprintf(stderr, gettext("filesystem "
	"successfully created, but not mounted\n"));
	ret = 1;
	} else if (zfs_share(zhp) != 0) {
	(void) fprintf(stderr, gettext("filesystem "
	"successfully created, but not shared\n"));
	ret = 1;
	}
	zfs_commit_all_shares();
	}

	zfs_close(zhp);

	return (ret);
	}

	/*
	* zfs clone [-p] [-o prop=value] ... <snap> <fs \| vol>
	*
	* Given an existing dataset, create a writable copy whose initial contents
	* are the same as the source. The newly created dataset maintains a
	* dependency on the original; the original cannot be destroyed so long as
	* the clone exists.
	*
	* The '-p' flag creates all the non-existing ancestors of the target first.
	*/
	static int
	zfs_do_clone(int argc, char **argv)
	{
	zfs_handle_t *zhp = NULL;
	boolean_t parents = B_FALSE;
	nvlist_t *props;
	int ret = 0;
	int c;

	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
	nomem();

	/* check options */
	while ((c = getopt(argc, argv, "o:p")) != -1) {
	switch (c) {
	case 'o':
	if (!parseprop(props, optarg)) {
	nvlist_free(props);
	return (1);
	}
	break;
	case 'p':
	parents = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	goto usage;
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing source dataset "
	"argument\n"));
	goto usage;
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing target dataset "
	"argument\n"));
	goto usage;
	}
	if (argc > 2) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	goto usage;
	}

	/* open the source dataset */
	if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL) {
	nvlist_free(props);
	return (1);
	}

	if (parents && zfs_name_valid(argv[1], ZFS_TYPE_FILESYSTEM \|
	ZFS_TYPE_VOLUME)) {
	/*
	* Now create the ancestors of the target dataset. If the
	* target already exists and '-p' option was used we should not
	* complain.
	*/
	if (zfs_dataset_exists(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM \|
	ZFS_TYPE_VOLUME)) {
	zfs_close(zhp);
	nvlist_free(props);
	return (0);
	}
	if (zfs_create_ancestors(g_zfs, argv[1]) != 0) {
	zfs_close(zhp);
	nvlist_free(props);
	return (1);
	}
	}

	/* pass to libzfs */
	ret = zfs_clone(zhp, argv[1], props);

	/* create the mountpoint if necessary */
	if (ret == 0) {
	if (log_history) {
	(void) zpool_log_history(g_zfs, history_str);
	log_history = B_FALSE;
	}

	ret = zfs_mount_and_share(g_zfs, argv[1], ZFS_TYPE_DATASET);
	}

	zfs_close(zhp);
	nvlist_free(props);

	return (!!ret);

	usage:
	ASSERT3P(zhp, ==, NULL);
	nvlist_free(props);
	usage(B_FALSE);
	return (-1);
	}

	/*
	* Return a default volblocksize for the pool which always uses more than
	* half of the data sectors. This primarily applies to dRAID which always
	* writes full stripe widths.
	*/
	static uint64_t
	default_volblocksize(zpool_handle_t zhp, nvlist_t props)
	{
	uint64_t volblocksize, asize = SPA_MINBLOCKSIZE;
	nvlist_t tree, *vdevs;
	uint_t nvdevs;

	nvlist_t *config = zpool_get_config(zhp, NULL);

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &tree) != 0 \|\|
	nvlist_lookup_nvlist_array(tree, ZPOOL_CONFIG_CHILDREN,
	&vdevs, &nvdevs) != 0) {
	return (ZVOL_DEFAULT_BLOCKSIZE);
	}

	for (int i = 0; i < nvdevs; i++) {
	nvlist_t *nv = vdevs[i];
	uint64_t ashift, ndata, nparity;

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &ashift) != 0)
	continue;

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DRAID_NDATA,
	&ndata) == 0) {
	/* dRAID minimum allocation width */
	asize = MAX(asize, ndata * (1ULL << ashift));
	} else if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY,
	&nparity) == 0) {
	/* raidz minimum allocation width */
	if (nparity == 1)
	asize = MAX(asize, 2 * (1ULL << ashift));
	else
	asize = MAX(asize, 4 * (1ULL << ashift));
	} else {
	/* mirror or (non-redundant) leaf vdev */
	asize = MAX(asize, 1ULL << ashift);
	}
	}

	/*
	* Calculate the target volblocksize such that more than half
	* of the asize is used. The following table is for 4k sectors.
	*
	* n asize blksz used \| n asize blksz used
	* -------------------------+---------------------------------
	* 1 4,096 8,192 100% \| 9 36,864 32,768 88%
	* 2 8,192 8,192 100% \| 10 40,960 32,768 80%
	* 3 12,288 8,192 66% \| 11 45,056 32,768 72%
	* 4 16,384 16,384 100% \| 12 49,152 32,768 66%
	* 5 20,480 16,384 80% \| 13 53,248 32,768 61%
	* 6 24,576 16,384 66% \| 14 57,344 32,768 57%
	* 7 28,672 16,384 57% \| 15 61,440 32,768 53%
	* 8 32,768 32,768 100% \| 16 65,536 65,636 100%
	*
	* This is primarily a concern for dRAID which always allocates
	* a full stripe width. For dRAID the default stripe width is
	* n=8 in which case the volblocksize is set to 32k. Ignoring
	* compression there are no unused sectors. This same reasoning
	* applies to raidz[2,3] so target 4 sectors to minimize waste.
	*/
	uint64_t tgt_volblocksize = ZVOL_DEFAULT_BLOCKSIZE;
	while (tgt_volblocksize * 2 <= asize)
	tgt_volblocksize *= 2;

	const char *prop = zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE);
	if (nvlist_lookup_uint64(props, prop, &volblocksize) == 0) {

	/* Issue a warning when a non-optimal size is requested. */
	if (volblocksize < ZVOL_DEFAULT_BLOCKSIZE) {
	(void) fprintf(stderr, gettext("Warning: "
	"volblocksize (%llu) is less than the default "
	"minimum block size (%llu).\nTo reduce wasted "
	"space a volblocksize of %llu is recommended.\n"),
	(u_longlong_t)volblocksize,
	(u_longlong_t)ZVOL_DEFAULT_BLOCKSIZE,
	(u_longlong_t)tgt_volblocksize);
	} else if (volblocksize < tgt_volblocksize) {
	(void) fprintf(stderr, gettext("Warning: "
	"volblocksize (%llu) is much less than the "
	"minimum allocation\nunit (%llu), which wastes "
	"at least %llu%% of space. To reduce wasted "
	"space,\nuse a larger volblocksize (%llu is "
	"recommended), fewer dRAID data disks\n"
	"per group, or smaller sector size (ashift).\n"),
	(u_longlong_t)volblocksize, (u_longlong_t)asize,
	(u_longlong_t)((100 * (asize - volblocksize)) /
	asize), (u_longlong_t)tgt_volblocksize);
	}
	} else {
	volblocksize = tgt_volblocksize;
	fnvlist_add_uint64(props, prop, volblocksize);
	}

	return (volblocksize);
	}

	/*
	* zfs create [-Pnpv] [-o prop=value] ... fs
	* zfs create [-Pnpsv] [-b blocksize] [-o prop=value] ... -V vol size
	*
	* Create a new dataset. This command can be used to create filesystems
	* and volumes. Snapshot creation is handled by 'zfs snapshot'.
	* For volumes, the user must specify a size to be used.
	*
	* The '-s' flag applies only to volumes, and indicates that we should not try
	* to set the reservation for this volume. By default we set a reservation
	* equal to the size for any volume. For pools with SPA_VERSION >=
	* SPA_VERSION_REFRESERVATION, we set a refreservation instead.
	*
	* The '-p' flag creates all the non-existing ancestors of the target first.
	*
	* The '-n' flag is no-op (dry run) mode. This will perform a user-space sanity
	* check of arguments and properties, but does not check for permissions,
	* available space, etc.
	*
	* The '-u' flag prevents the newly created file system from being mounted.
	*
	* The '-v' flag is for verbose output.
	*
	* The '-P' flag is used for parseable output. It implies '-v'.
	*/
	static int
	zfs_do_create(int argc, char **argv)
	{
	zfs_type_t type = ZFS_TYPE_FILESYSTEM;
	zpool_handle_t *zpool_handle = NULL;
	nvlist_t *real_props = NULL;
	uint64_t volsize = 0;
	int c;
	boolean_t noreserve = B_FALSE;
	boolean_t bflag = B_FALSE;
	boolean_t parents = B_FALSE;
	boolean_t dryrun = B_FALSE;
	boolean_t nomount = B_FALSE;
	boolean_t verbose = B_FALSE;
	boolean_t parseable = B_FALSE;
	int ret = 1;
	nvlist_t *props;
	uint64_t intval;
	char *strval;

	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
	nomem();

	/* check options */
	while ((c = getopt(argc, argv, ":PV:b:nso:puv")) != -1) {
	switch (c) {
	case 'V':
	type = ZFS_TYPE_VOLUME;
	if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
	(void) fprintf(stderr, gettext("bad volume "
	"size '%s': %s\n"), optarg,
	libzfs_error_description(g_zfs));
	goto error;
	}

	if (nvlist_add_uint64(props,
	zfs_prop_to_name(ZFS_PROP_VOLSIZE), intval) != 0)
	nomem();
	volsize = intval;
	break;
	case 'P':
	verbose = B_TRUE;
	parseable = B_TRUE;
	break;
	case 'p':
	parents = B_TRUE;
	break;
	case 'b':
	bflag = B_TRUE;
	if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
	(void) fprintf(stderr, gettext("bad volume "
	"block size '%s': %s\n"), optarg,
	libzfs_error_description(g_zfs));
	goto error;
	}

	if (nvlist_add_uint64(props,
	zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
	intval) != 0)
	nomem();
	break;
	case 'n':
	dryrun = B_TRUE;
	break;
	case 'o':
	if (!parseprop(props, optarg))
	goto error;
	break;
	case 's':
	noreserve = B_TRUE;
	break;
	case 'u':
	nomount = B_TRUE;
	break;
	case 'v':
	verbose = B_TRUE;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing size "
	"argument\n"));
	goto badusage;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	goto badusage;
	}
	}

	if ((bflag \|\| noreserve) && type != ZFS_TYPE_VOLUME) {
	(void) fprintf(stderr, gettext("'-s' and '-b' can only be "
	"used when creating a volume\n"));
	goto badusage;
	}
	if (nomount && type != ZFS_TYPE_FILESYSTEM) {
	(void) fprintf(stderr, gettext("'-u' can only be "
	"used when creating a filesystem\n"));
	goto badusage;
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc == 0) {
	(void) fprintf(stderr, gettext("missing %s argument\n"),
	zfs_type_to_name(type));
	goto badusage;
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	goto badusage;
	}

	if (dryrun \|\| type == ZFS_TYPE_VOLUME) {
	char msg[ZFS_MAX_DATASET_NAME_LEN * 2];
	char *p;

	if ((p = strchr(argv[0], '/')) != NULL)
	*p = '\0';
	zpool_handle = zpool_open(g_zfs, argv[0]);
	if (p != NULL)
	*p = '/';
	if (zpool_handle == NULL)
	goto error;

	(void) snprintf(msg, sizeof (msg),
	dryrun ? gettext("cannot verify '%s'") :
	gettext("cannot create '%s'"), argv[0]);
	if (props && (real_props = zfs_valid_proplist(g_zfs, type,
	props, 0, NULL, zpool_handle, B_TRUE, msg)) == NULL) {
	zpool_close(zpool_handle);
	goto error;
	}
	}

	if (type == ZFS_TYPE_VOLUME) {
	const char *prop = zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE);
	uint64_t volblocksize = default_volblocksize(zpool_handle,
	real_props);

	if (volblocksize != ZVOL_DEFAULT_BLOCKSIZE &&
	nvlist_lookup_string(props, prop, &strval) != 0) {
	if (asprintf(&strval, "%llu",
	(u_longlong_t)volblocksize) == -1)
	nomem();
	nvlist_add_string(props, prop, strval);
	free(strval);
	}

	/*
	* If volsize is not a multiple of volblocksize, round it
	* up to the nearest multiple of the volblocksize.
	*/
	if (volsize % volblocksize) {
	volsize = P2ROUNDUP_TYPED(volsize, volblocksize,
	uint64_t);

	if (nvlist_add_uint64(props,
	zfs_prop_to_name(ZFS_PROP_VOLSIZE), volsize) != 0) {
	nvlist_free(props);
	nomem();
	}
	}
	}

	if (type == ZFS_TYPE_VOLUME && !noreserve) {
	uint64_t spa_version;
	zfs_prop_t resv_prop;

	spa_version = zpool_get_prop_int(zpool_handle,
	ZPOOL_PROP_VERSION, NULL);
	if (spa_version >= SPA_VERSION_REFRESERVATION)
	resv_prop = ZFS_PROP_REFRESERVATION;
	else
	resv_prop = ZFS_PROP_RESERVATION;

	volsize = zvol_volsize_to_reservation(zpool_handle, volsize,
	real_props);

	if (nvlist_lookup_string(props, zfs_prop_to_name(resv_prop),
	&strval) != 0) {
	if (nvlist_add_uint64(props,
	zfs_prop_to_name(resv_prop), volsize) != 0) {
	nvlist_free(props);
	nomem();
	}
	}
	}
	if (zpool_handle != NULL) {
	zpool_close(zpool_handle);
	nvlist_free(real_props);
	}

	if (parents && zfs_name_valid(argv[0], type)) {
	/*
	* Now create the ancestors of target dataset. If the target
	* already exists and '-p' option was used we should not
	* complain.
	*/
	if (zfs_dataset_exists(g_zfs, argv[0], type)) {
	ret = 0;
	goto error;
	}
	if (verbose) {
	(void) printf(parseable ? "create_ancestors\t%s\n" :
	dryrun ? "would create ancestors of %s\n" :
	"create ancestors of %s\n", argv[0]);
	}
	if (!dryrun) {
	if (zfs_create_ancestors(g_zfs, argv[0]) != 0) {
	goto error;
	}
	}
	}

	if (verbose) {
	nvpair_t *nvp = NULL;
	(void) printf(parseable ? "create\t%s\n" :
	dryrun ? "would create %s\n" : "create %s\n", argv[0]);
	while ((nvp = nvlist_next_nvpair(props, nvp)) != NULL) {
	uint64_t uval;
	char *sval;

	switch (nvpair_type(nvp)) {
	case DATA_TYPE_UINT64:
	VERIFY0(nvpair_value_uint64(nvp, &uval));
	(void) printf(parseable ?
	"property\t%s\t%llu\n" : "\t%s=%llu\n",
	nvpair_name(nvp), (u_longlong_t)uval);
	break;
	case DATA_TYPE_STRING:
	VERIFY0(nvpair_value_string(nvp, &sval));
	(void) printf(parseable ?
	"property\t%s\t%s\n" : "\t%s=%s\n",
	nvpair_name(nvp), sval);
	break;
	default:
	(void) fprintf(stderr, "property '%s' "
	"has illegal type %d\n",
	nvpair_name(nvp), nvpair_type(nvp));
	abort();
	}
	}
	}
	if (dryrun) {
	ret = 0;
	goto error;
	}

	/* pass to libzfs */
	if (zfs_create(g_zfs, argv[0], type, props) != 0)
	goto error;

	if (log_history) {
	(void) zpool_log_history(g_zfs, history_str);
	log_history = B_FALSE;
	}

	if (nomount) {
	ret = 0;
	goto error;
	}

	ret = zfs_mount_and_share(g_zfs, argv[0], ZFS_TYPE_DATASET);
	error:
	nvlist_free(props);
	return (ret);
	badusage:
	nvlist_free(props);
	usage(B_FALSE);
	return (2);
	}

	/*
	* zfs destroy [-rRf] <fs, vol>
	* zfs destroy [-rRd] <snap>
	*
	* -r Recursively destroy all children
	* -R Recursively destroy all dependents, including clones
	* -f Force unmounting of any dependents
	* -d If we can't destroy now, mark for deferred destruction
	*
	* Destroys the given dataset. By default, it will unmount any filesystems,
	* and refuse to destroy a dataset that has any dependents. A dependent can
	* either be a child, or a clone of a child.
	*/
	typedef struct destroy_cbdata {
	boolean_t cb_first;
	boolean_t cb_force;
	boolean_t cb_recurse;
	boolean_t cb_error;
	boolean_t cb_doclones;
	zfs_handle_t *cb_target;
	boolean_t cb_defer_destroy;
	boolean_t cb_verbose;
	boolean_t cb_parsable;
	boolean_t cb_dryrun;
	nvlist_t *cb_nvl;
	nvlist_t *cb_batchedsnaps;

	/* first snap in contiguous run */
	char *cb_firstsnap;
	/* previous snap in contiguous run */
	char *cb_prevsnap;
	int64_t cb_snapused;
	char *cb_snapspec;
	char *cb_bookmark;
	uint64_t cb_snap_count;
	} destroy_cbdata_t;

	/*
	* Check for any dependents based on the '-r' or '-R' flags.
	*/
	static int
	destroy_check_dependent(zfs_handle_t zhp, void data)
	{
	destroy_cbdata_t *cbp = data;
	const char *tname = zfs_get_name(cbp->cb_target);
	const char *name = zfs_get_name(zhp);

	if (strncmp(tname, name, strlen(tname)) == 0 &&
	(name[strlen(tname)] == '/' \|\| name[strlen(tname)] == '@')) {
	/*
	* This is a direct descendant, not a clone somewhere else in
	* the hierarchy.
	*/
	if (cbp->cb_recurse)
	goto out;

	if (cbp->cb_first) {
	(void) fprintf(stderr, gettext("cannot destroy '%s': "
	"%s has children\n"),
	zfs_get_name(cbp->cb_target),
	zfs_type_to_name(zfs_get_type(cbp->cb_target)));
	(void) fprintf(stderr, gettext("use '-r' to destroy "
	"the following datasets:\n"));
	cbp->cb_first = B_FALSE;
	cbp->cb_error = B_TRUE;
	}

	(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
	} else {
	/*
	* This is a clone. We only want to report this if the '-r'
	* wasn't specified, or the target is a snapshot.
	*/
	if (!cbp->cb_recurse &&
	zfs_get_type(cbp->cb_target) != ZFS_TYPE_SNAPSHOT)
	goto out;

	if (cbp->cb_first) {
	(void) fprintf(stderr, gettext("cannot destroy '%s': "
	"%s has dependent clones\n"),
	zfs_get_name(cbp->cb_target),
	zfs_type_to_name(zfs_get_type(cbp->cb_target)));
	(void) fprintf(stderr, gettext("use '-R' to destroy "
	"the following datasets:\n"));
	cbp->cb_first = B_FALSE;
	cbp->cb_error = B_TRUE;
	cbp->cb_dryrun = B_TRUE;
	}

	(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
	}

	out:
	zfs_close(zhp);
	return (0);
	}

	static int
	destroy_batched(destroy_cbdata_t *cb)
	{
	int error = zfs_destroy_snaps_nvl(g_zfs,
	cb->cb_batchedsnaps, B_FALSE);
	fnvlist_free(cb->cb_batchedsnaps);
	cb->cb_batchedsnaps = fnvlist_alloc();
	return (error);
	}

	static int
	destroy_callback(zfs_handle_t zhp, void data)
	{
	destroy_cbdata_t *cb = data;
	const char *name = zfs_get_name(zhp);
	int error;

	if (cb->cb_verbose) {
	if (cb->cb_parsable) {
	(void) printf("destroy\t%s\n", name);
	} else if (cb->cb_dryrun) {
	(void) printf(gettext("would destroy %s\n"),
	name);
	} else {
	(void) printf(gettext("will destroy %s\n"),
	name);
	}
	}

	/*
	* Ignore pools (which we've already flagged as an error before getting
	* here).
	*/
	if (strchr(zfs_get_name(zhp), '/') == NULL &&
	zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
	zfs_close(zhp);
	return (0);
	}
	if (cb->cb_dryrun) {
	zfs_close(zhp);
	return (0);
	}

	/*
	* We batch up all contiguous snapshots (even of different
	* filesystems) and destroy them with one ioctl. We can't
	* simply do all snap deletions and then all fs deletions,
	* because we must delete a clone before its origin.
	*/
	if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT) {
	cb->cb_snap_count++;
	fnvlist_add_boolean(cb->cb_batchedsnaps, name);
	if (cb->cb_snap_count % 10 == 0 && cb->cb_defer_destroy)
	error = destroy_batched(cb);
	} else {
	error = destroy_batched(cb);
	if (error != 0 \|\|
	zfs_unmount(zhp, NULL, cb->cb_force ? MS_FORCE : 0) != 0 \|\|
	zfs_destroy(zhp, cb->cb_defer_destroy) != 0) {
	zfs_close(zhp);
	/*
	* When performing a recursive destroy we ignore errors
	* so that the recursive destroy could continue
	* destroying past problem datasets
	*/
	if (cb->cb_recurse) {
	cb->cb_error = B_TRUE;
	return (0);
	}
	return (-1);
	}
	}

	zfs_close(zhp);
	return (0);
	}

	static int
	destroy_print_cb(zfs_handle_t zhp, void arg)
	{
	destroy_cbdata_t *cb = arg;
	const char *name = zfs_get_name(zhp);
	int err = 0;

	if (nvlist_exists(cb->cb_nvl, name)) {
	if (cb->cb_firstsnap == NULL)
	cb->cb_firstsnap = strdup(name);
	if (cb->cb_prevsnap != NULL)
	free(cb->cb_prevsnap);
	/* this snap continues the current range */
	cb->cb_prevsnap = strdup(name);
	if (cb->cb_firstsnap == NULL \|\| cb->cb_prevsnap == NULL)
	nomem();
	if (cb->cb_verbose) {
	if (cb->cb_parsable) {
	(void) printf("destroy\t%s\n", name);
	} else if (cb->cb_dryrun) {
	(void) printf(gettext("would destroy %s\n"),
	name);
	} else {
	(void) printf(gettext("will destroy %s\n"),
	name);
	}
	}
	} else if (cb->cb_firstsnap != NULL) {
	/* end of this range */
	uint64_t used = 0;
	err = lzc_snaprange_space(cb->cb_firstsnap,
	cb->cb_prevsnap, &used);
	cb->cb_snapused += used;
	free(cb->cb_firstsnap);
	cb->cb_firstsnap = NULL;
	free(cb->cb_prevsnap);
	cb->cb_prevsnap = NULL;
	}
	zfs_close(zhp);
	return (err);
	}

	static int
	destroy_print_snapshots(zfs_handle_t fs_zhp, destroy_cbdata_t cb)
	{
	int err;
	assert(cb->cb_firstsnap == NULL);
	assert(cb->cb_prevsnap == NULL);
	err = zfs_iter_snapshots_sorted(fs_zhp, destroy_print_cb, cb, 0, 0);
	if (cb->cb_firstsnap != NULL) {
	uint64_t used = 0;
	if (err == 0) {
	err = lzc_snaprange_space(cb->cb_firstsnap,
	cb->cb_prevsnap, &used);
	}
	cb->cb_snapused += used;
	free(cb->cb_firstsnap);
	cb->cb_firstsnap = NULL;
	free(cb->cb_prevsnap);
	cb->cb_prevsnap = NULL;
	}
	return (err);
	}

	static int
	snapshot_to_nvl_cb(zfs_handle_t zhp, void arg)
	{
	destroy_cbdata_t *cb = arg;
	int err = 0;

	/* Check for clones. */
	if (!cb->cb_doclones && !cb->cb_defer_destroy) {
	cb->cb_target = zhp;
	cb->cb_first = B_TRUE;
	err = zfs_iter_dependents(zhp, B_TRUE,
	destroy_check_dependent, cb);
	}

	if (err == 0) {
	if (nvlist_add_boolean(cb->cb_nvl, zfs_get_name(zhp)))
	nomem();
	}
	zfs_close(zhp);
	return (err);
	}

	static int
	gather_snapshots(zfs_handle_t zhp, void arg)
	{
	destroy_cbdata_t *cb = arg;
	int err = 0;

	err = zfs_iter_snapspec(zhp, cb->cb_snapspec, snapshot_to_nvl_cb, cb);
	if (err == ENOENT)
	err = 0;
	if (err != 0)
	goto out;

	if (cb->cb_verbose) {
	err = destroy_print_snapshots(zhp, cb);
	if (err != 0)
	goto out;
	}

	if (cb->cb_recurse)
	err = zfs_iter_filesystems(zhp, gather_snapshots, cb);

	out:
	zfs_close(zhp);
	return (err);
	}

	static int
	destroy_clones(destroy_cbdata_t *cb)
	{
	nvpair_t *pair;
	for (pair = nvlist_next_nvpair(cb->cb_nvl, NULL);
	pair != NULL;
	pair = nvlist_next_nvpair(cb->cb_nvl, pair)) {
	zfs_handle_t *zhp = zfs_open(g_zfs, nvpair_name(pair),
	ZFS_TYPE_SNAPSHOT);
	if (zhp != NULL) {
	boolean_t defer = cb->cb_defer_destroy;
	int err;

	/*
	* We can't defer destroy non-snapshots, so set it to
	* false while destroying the clones.
	*/
	cb->cb_defer_destroy = B_FALSE;
	err = zfs_iter_dependents(zhp, B_FALSE,
	destroy_callback, cb);
	cb->cb_defer_destroy = defer;
	zfs_close(zhp);
	if (err != 0)
	return (err);
	}
	}
	return (0);
	}

	static int
	zfs_do_destroy(int argc, char **argv)
	{
	destroy_cbdata_t cb = { 0 };
	int rv = 0;
	int err = 0;
	int c;
	zfs_handle_t *zhp = NULL;
	char at, pound;
	zfs_type_t type = ZFS_TYPE_DATASET;

	/* check options */
	while ((c = getopt(argc, argv, "vpndfrR")) != -1) {
	switch (c) {
	case 'v':
	cb.cb_verbose = B_TRUE;
	break;
	case 'p':
	cb.cb_verbose = B_TRUE;
	cb.cb_parsable = B_TRUE;
	break;
	case 'n':
	cb.cb_dryrun = B_TRUE;
	break;
	case 'd':
	cb.cb_defer_destroy = B_TRUE;
	type = ZFS_TYPE_SNAPSHOT;
	break;
	case 'f':
	cb.cb_force = B_TRUE;
	break;
	case 'r':
	cb.cb_recurse = B_TRUE;
	break;
	case 'R':
	cb.cb_recurse = B_TRUE;
	cb.cb_doclones = B_TRUE;
	break;
	case '?':
	default:
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc == 0) {
	(void) fprintf(stderr, gettext("missing dataset argument\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	at = strchr(argv[0], '@');
	pound = strchr(argv[0], '#');
	if (at != NULL) {

	/* Build the list of snaps to destroy in cb_nvl. */
	cb.cb_nvl = fnvlist_alloc();

	*at = '\0';
	zhp = zfs_open(g_zfs, argv[0],
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL) {
	nvlist_free(cb.cb_nvl);
	return (1);
	}

	cb.cb_snapspec = at + 1;
	if (gather_snapshots(zfs_handle_dup(zhp), &cb) != 0 \|\|
	cb.cb_error) {
	rv = 1;
	goto out;
	}

	if (nvlist_empty(cb.cb_nvl)) {
	(void) fprintf(stderr, gettext("could not find any "
	"snapshots to destroy; check snapshot names.\n"));
	rv = 1;
	goto out;
	}

	if (cb.cb_verbose) {
	char buf[16];
	zfs_nicebytes(cb.cb_snapused, buf, sizeof (buf));
	if (cb.cb_parsable) {
	(void) printf("reclaim\t%llu\n",
	(u_longlong_t)cb.cb_snapused);
	} else if (cb.cb_dryrun) {
	(void) printf(gettext("would reclaim %s\n"),
	buf);
	} else {
	(void) printf(gettext("will reclaim %s\n"),
	buf);
	}
	}

	if (!cb.cb_dryrun) {
	if (cb.cb_doclones) {
	cb.cb_batchedsnaps = fnvlist_alloc();
	err = destroy_clones(&cb);
	if (err == 0) {
	err = zfs_destroy_snaps_nvl(g_zfs,
	cb.cb_batchedsnaps, B_FALSE);
	}
	if (err != 0) {
	rv = 1;
	goto out;
	}
	}
	if (err == 0) {
	err = zfs_destroy_snaps_nvl(g_zfs, cb.cb_nvl,
	cb.cb_defer_destroy);
	}
	}

	if (err != 0)
	rv = 1;
	} else if (pound != NULL) {
	int err;
	nvlist_t *nvl;

	if (cb.cb_dryrun) {
	(void) fprintf(stderr,
	"dryrun is not supported with bookmark\n");
	return (-1);
	}

	if (cb.cb_defer_destroy) {
	(void) fprintf(stderr,
	"defer destroy is not supported with bookmark\n");
	return (-1);
	}

	if (cb.cb_recurse) {
	(void) fprintf(stderr,
	"recursive is not supported with bookmark\n");
	return (-1);
	}

	/*
	* Unfortunately, zfs_bookmark() doesn't honor the
	* casesensitivity setting. However, we can't simply
	* remove this check, because lzc_destroy_bookmarks()
	* ignores non-existent bookmarks, so this is necessary
	* to get a proper error message.
	*/
	if (!zfs_bookmark_exists(argv[0])) {
	(void) fprintf(stderr, gettext("bookmark '%s' "
	"does not exist.\n"), argv[0]);
	return (1);
	}

	nvl = fnvlist_alloc();
	fnvlist_add_boolean(nvl, argv[0]);

	err = lzc_destroy_bookmarks(nvl, NULL);
	if (err != 0) {
	(void) zfs_standard_error(g_zfs, err,
	"cannot destroy bookmark");
	}

	nvlist_free(nvl);

	return (err);
	} else {
	/* Open the given dataset */
	if ((zhp = zfs_open(g_zfs, argv[0], type)) == NULL)
	return (1);

	cb.cb_target = zhp;

	/*
	* Perform an explicit check for pools before going any further.
	*/
	if (!cb.cb_recurse && strchr(zfs_get_name(zhp), '/') == NULL &&
	zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
	(void) fprintf(stderr, gettext("cannot destroy '%s': "
	"operation does not apply to pools\n"),
	zfs_get_name(zhp));
	(void) fprintf(stderr, gettext("use 'zfs destroy -r "
	"%s' to destroy all datasets in the pool\n"),
	zfs_get_name(zhp));
	(void) fprintf(stderr, gettext("use 'zpool destroy %s' "
	"to destroy the pool itself\n"), zfs_get_name(zhp));
	rv = 1;
	goto out;
	}

	/*
	* Check for any dependents and/or clones.
	*/
	cb.cb_first = B_TRUE;
	if (!cb.cb_doclones &&
	zfs_iter_dependents(zhp, B_TRUE, destroy_check_dependent,
	&cb) != 0) {
	rv = 1;
	goto out;
	}

	if (cb.cb_error) {
	rv = 1;
	goto out;
	}
	cb.cb_batchedsnaps = fnvlist_alloc();
	if (zfs_iter_dependents(zhp, B_FALSE, destroy_callback,
	&cb) != 0) {
	rv = 1;
	goto out;
	}

	/*
	* Do the real thing. The callback will close the
	* handle regardless of whether it succeeds or not.
	*/
	err = destroy_callback(zhp, &cb);
	zhp = NULL;
	if (err == 0) {
	err = zfs_destroy_snaps_nvl(g_zfs,
	cb.cb_batchedsnaps, cb.cb_defer_destroy);
	}
	if (err != 0 \|\| cb.cb_error == B_TRUE)
	rv = 1;
	}

	out:
	fnvlist_free(cb.cb_batchedsnaps);
	fnvlist_free(cb.cb_nvl);
	if (zhp != NULL)
	zfs_close(zhp);
	return (rv);
	}

	static boolean_t
	is_recvd_column(zprop_get_cbdata_t *cbp)
	{
	int i;
	zfs_get_column_t col;

	for (i = 0; i < ZFS_GET_NCOLS &&
	(col = cbp->cb_columns[i]) != GET_COL_NONE; i++)
	if (col == GET_COL_RECVD)
	return (B_TRUE);
	return (B_FALSE);
	}

	/*
	* zfs get [-rHp] [-o all \| field[,field]...] [-s source[,source]...]
	* < all \| property[,property]... > < fs \| snap \| vol > ...
	*
	* -r recurse over any child datasets
	* -H scripted mode. Headers are stripped, and fields are separated
	* by tabs instead of spaces.
	* -o Set of fields to display. One of "name,property,value,
	* received,source". Default is "name,property,value,source".
	* "all" is an alias for all five.
	* -s Set of sources to allow. One of
	* "local,default,inherited,received,temporary,none". Default is
	* all six.
	* -p Display values in parsable (literal) format.
	*
	* Prints properties for the given datasets. The user can control which
	* columns to display as well as which property types to allow.
	*/

	/*
	* Invoked to display the properties for a single dataset.
	*/
	static int
	get_callback(zfs_handle_t zhp, void data)
	{
	char buf[ZFS_MAXPROPLEN];
	char rbuf[ZFS_MAXPROPLEN];
	zprop_source_t sourcetype;
	char source[ZFS_MAX_DATASET_NAME_LEN];
	zprop_get_cbdata_t *cbp = data;
	nvlist_t *user_props = zfs_get_user_props(zhp);
	zprop_list_t *pl = cbp->cb_proplist;
	nvlist_t *propval;
	char *strval;
	char *sourceval;
	boolean_t received = is_recvd_column(cbp);

	for (; pl != NULL; pl = pl->pl_next) {
	char *recvdval = NULL;
	/*
	* Skip the special fake placeholder. This will also skip over
	* the name property when 'all' is specified.
	*/
	if (pl->pl_prop == ZFS_PROP_NAME &&
	pl == cbp->cb_proplist)
	continue;

	if (pl->pl_prop != ZPROP_INVAL) {
	if (zfs_prop_get(zhp, pl->pl_prop, buf,
	sizeof (buf), &sourcetype, source,
	sizeof (source),
	cbp->cb_literal) != 0) {
	if (pl->pl_all)
	continue;
	if (!zfs_prop_valid_for_type(pl->pl_prop,
	ZFS_TYPE_DATASET, B_FALSE)) {
	(void) fprintf(stderr,
	gettext("No such property '%s'\n"),
	zfs_prop_to_name(pl->pl_prop));
	continue;
	}
	sourcetype = ZPROP_SRC_NONE;
	(void) strlcpy(buf, "-", sizeof (buf));
	}

	if (received && (zfs_prop_get_recvd(zhp,
	zfs_prop_to_name(pl->pl_prop), rbuf, sizeof (rbuf),
	cbp->cb_literal) == 0))
	recvdval = rbuf;

	zprop_print_one_property(zfs_get_name(zhp), cbp,
	zfs_prop_to_name(pl->pl_prop),
	buf, sourcetype, source, recvdval);
	} else if (zfs_prop_userquota(pl->pl_user_prop)) {
	sourcetype = ZPROP_SRC_LOCAL;

	if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
	buf, sizeof (buf), cbp->cb_literal) != 0) {
	sourcetype = ZPROP_SRC_NONE;
	(void) strlcpy(buf, "-", sizeof (buf));
	}

	zprop_print_one_property(zfs_get_name(zhp), cbp,
	pl->pl_user_prop, buf, sourcetype, source, NULL);
	} else if (zfs_prop_written(pl->pl_user_prop)) {
	sourcetype = ZPROP_SRC_LOCAL;

	if (zfs_prop_get_written(zhp, pl->pl_user_prop,
	buf, sizeof (buf), cbp->cb_literal) != 0) {
	sourcetype = ZPROP_SRC_NONE;
	(void) strlcpy(buf, "-", sizeof (buf));
	}

	zprop_print_one_property(zfs_get_name(zhp), cbp,
	pl->pl_user_prop, buf, sourcetype, source, NULL);
	} else {
	if (nvlist_lookup_nvlist(user_props,
	pl->pl_user_prop, &propval) != 0) {
	if (pl->pl_all)
	continue;
	sourcetype = ZPROP_SRC_NONE;
	strval = "-";
	} else {
	verify(nvlist_lookup_string(propval,
	ZPROP_VALUE, &strval) == 0);
	verify(nvlist_lookup_string(propval,
	ZPROP_SOURCE, &sourceval) == 0);

	if (strcmp(sourceval,
	zfs_get_name(zhp)) == 0) {
	sourcetype = ZPROP_SRC_LOCAL;
	} else if (strcmp(sourceval,
	ZPROP_SOURCE_VAL_RECVD) == 0) {
	sourcetype = ZPROP_SRC_RECEIVED;
	} else {
	sourcetype = ZPROP_SRC_INHERITED;
	(void) strlcpy(source,
	sourceval, sizeof (source));
	}
	}

	if (received && (zfs_prop_get_recvd(zhp,
	pl->pl_user_prop, rbuf, sizeof (rbuf),
	cbp->cb_literal) == 0))
	recvdval = rbuf;

	zprop_print_one_property(zfs_get_name(zhp), cbp,
	pl->pl_user_prop, strval, sourcetype,
	source, recvdval);
	}
	}

	return (0);
	}

	static int
	zfs_do_get(int argc, char **argv)
	{
	zprop_get_cbdata_t cb = { 0 };
	int i, c, flags = ZFS_ITER_ARGS_CAN_BE_PATHS;
	int types = ZFS_TYPE_DATASET \| ZFS_TYPE_BOOKMARK;
	char value, fields;
	int ret = 0;
	int limit = 0;
	zprop_list_t fake_name = { 0 };

	/*
	* Set up default columns and sources.
	*/
	cb.cb_sources = ZPROP_SRC_ALL;
	cb.cb_columns[0] = GET_COL_NAME;
	cb.cb_columns[1] = GET_COL_PROPERTY;
	cb.cb_columns[2] = GET_COL_VALUE;
	cb.cb_columns[3] = GET_COL_SOURCE;
	cb.cb_type = ZFS_TYPE_DATASET;

	/* check options */
	while ((c = getopt(argc, argv, ":d:o:s:rt:Hp")) != -1) {
	switch (c) {
	case 'p':
	cb.cb_literal = B_TRUE;
	break;
	case 'd':
	limit = parse_depth(optarg, &flags);
	break;
	case 'r':
	flags \|= ZFS_ITER_RECURSE;
	break;
	case 'H':
	cb.cb_scripted = B_TRUE;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case 'o':
	/*
	* Process the set of columns to display. We zero out
	* the structure to give us a blank slate.
	*/
	bzero(&cb.cb_columns, sizeof (cb.cb_columns));
	i = 0;
	while (*optarg != '\0') {
	static char *col_subopts[] =
	{ "name", "property", "value", "received",
	"source", "all", NULL };

	if (i == ZFS_GET_NCOLS) {
	(void) fprintf(stderr, gettext("too "
	"many fields given to -o "
	"option\n"));
	usage(B_FALSE);
	}

	switch (getsubopt(&optarg, col_subopts,
	&value)) {
	case 0:
	cb.cb_columns[i++] = GET_COL_NAME;
	break;
	case 1:
	cb.cb_columns[i++] = GET_COL_PROPERTY;
	break;
	case 2:
	cb.cb_columns[i++] = GET_COL_VALUE;
	break;
	case 3:
	cb.cb_columns[i++] = GET_COL_RECVD;
	flags \|= ZFS_ITER_RECVD_PROPS;
	break;
	case 4:
	cb.cb_columns[i++] = GET_COL_SOURCE;
	break;
	case 5:
	if (i > 0) {
	(void) fprintf(stderr,
	gettext("\"all\" conflicts "
	"with specific fields "
	"given to -o option\n"));
	usage(B_FALSE);
	}
	cb.cb_columns[0] = GET_COL_NAME;
	cb.cb_columns[1] = GET_COL_PROPERTY;
	cb.cb_columns[2] = GET_COL_VALUE;
	cb.cb_columns[3] = GET_COL_RECVD;
	cb.cb_columns[4] = GET_COL_SOURCE;
	flags \|= ZFS_ITER_RECVD_PROPS;
	i = ZFS_GET_NCOLS;
	break;
	default:
	(void) fprintf(stderr,
	gettext("invalid column name "
	"'%s'\n"), value);
	usage(B_FALSE);
	}
	}
	break;

	case 's':
	cb.cb_sources = 0;
	while (*optarg != '\0') {
	static char *source_subopts[] = {
	"local", "default", "inherited",
	"received", "temporary", "none",
	NULL };

	switch (getsubopt(&optarg, source_subopts,
	&value)) {
	case 0:
	cb.cb_sources \|= ZPROP_SRC_LOCAL;
	break;
	case 1:
	cb.cb_sources \|= ZPROP_SRC_DEFAULT;
	break;
	case 2:
	cb.cb_sources \|= ZPROP_SRC_INHERITED;
	break;
	case 3:
	cb.cb_sources \|= ZPROP_SRC_RECEIVED;
	break;
	case 4:
	cb.cb_sources \|= ZPROP_SRC_TEMPORARY;
	break;
	case 5:
	cb.cb_sources \|= ZPROP_SRC_NONE;
	break;
	default:
	(void) fprintf(stderr,
	gettext("invalid source "
	"'%s'\n"), value);
	usage(B_FALSE);
	}
	}
	break;

	case 't':
	types = 0;
	flags &= ~ZFS_ITER_PROP_LISTSNAPS;
	while (*optarg != '\0') {
	static char *type_subopts[] = { "filesystem",
	"volume", "snapshot", "snap", "bookmark",
	"all", NULL };

	switch (getsubopt(&optarg, type_subopts,
	&value)) {
	case 0:
	types \|= ZFS_TYPE_FILESYSTEM;
	break;
	case 1:
	types \|= ZFS_TYPE_VOLUME;
	break;
	case 2:
	case 3:
	types \|= ZFS_TYPE_SNAPSHOT;
	break;
	case 4:
	types \|= ZFS_TYPE_BOOKMARK;
	break;
	case 5:
	types = ZFS_TYPE_DATASET \|
	ZFS_TYPE_BOOKMARK;
	break;

	default:
	(void) fprintf(stderr,
	gettext("invalid type '%s'\n"),
	value);
	usage(B_FALSE);
	}
	}
	break;

	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing property "
	"argument\n"));
	usage(B_FALSE);
	}

	fields = argv[0];

	/*
	* Handle users who want to get all snapshots or bookmarks
	* of a dataset (ex. 'zfs get -t snapshot refer <dataset>').
	*/
	if ((types == ZFS_TYPE_SNAPSHOT \|\| types == ZFS_TYPE_BOOKMARK) &&
	argc > 1 && (flags & ZFS_ITER_RECURSE) == 0 && limit == 0) {
	flags \|= (ZFS_ITER_DEPTH_LIMIT \| ZFS_ITER_RECURSE);
	limit = 1;
	}

	if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
	!= 0)
	usage(B_FALSE);

	argc--;
	argv++;

	/*
	* As part of zfs_expand_proplist(), we keep track of the maximum column
	* width for each property. For the 'NAME' (and 'SOURCE') columns, we
	* need to know the maximum name length. However, the user likely did
	* not specify 'name' as one of the properties to fetch, so we need to
	* make sure we always include at least this property for
	* print_get_headers() to work properly.
	*/
	if (cb.cb_proplist != NULL) {
	fake_name.pl_prop = ZFS_PROP_NAME;
	fake_name.pl_width = strlen(gettext("NAME"));
	fake_name.pl_next = cb.cb_proplist;
	cb.cb_proplist = &fake_name;
	}

	cb.cb_first = B_TRUE;

	/* run for each object */
	ret = zfs_for_each(argc, argv, flags, types, NULL,
	&cb.cb_proplist, limit, get_callback, &cb);

	if (cb.cb_proplist == &fake_name)
	zprop_free_list(fake_name.pl_next);
	else
	zprop_free_list(cb.cb_proplist);

	return (ret);
	}

	/*
	* inherit [-rS] <property> <fs\|vol> ...
	*
	* -r Recurse over all children
	* -S Revert to received value, if any
	*
	* For each dataset specified on the command line, inherit the given property
	* from its parent. Inheriting a property at the pool level will cause it to
	* use the default value. The '-r' flag will recurse over all children, and is
	* useful for setting a property on a hierarchy-wide basis, regardless of any
	* local modifications for each dataset.
	*/

	typedef struct inherit_cbdata {
	const char *cb_propname;
	boolean_t cb_received;
	} inherit_cbdata_t;

	static int
	inherit_recurse_cb(zfs_handle_t zhp, void data)
	{
	inherit_cbdata_t *cb = data;
	zfs_prop_t prop = zfs_name_to_prop(cb->cb_propname);

	/*
	* If we're doing it recursively, then ignore properties that
	* are not valid for this type of dataset.
	*/
	if (prop != ZPROP_INVAL &&
	!zfs_prop_valid_for_type(prop, zfs_get_type(zhp), B_FALSE))
	return (0);

	return (zfs_prop_inherit(zhp, cb->cb_propname, cb->cb_received) != 0);
	}

	static int
	inherit_cb(zfs_handle_t zhp, void data)
	{
	inherit_cbdata_t *cb = data;

	return (zfs_prop_inherit(zhp, cb->cb_propname, cb->cb_received) != 0);
	}

	static int
	zfs_do_inherit(int argc, char **argv)
	{
	int c;
	zfs_prop_t prop;
	inherit_cbdata_t cb = { 0 };
	char *propname;
	int ret = 0;
	int flags = 0;
	boolean_t received = B_FALSE;

	/* check options */
	while ((c = getopt(argc, argv, "rS")) != -1) {
	switch (c) {
	case 'r':
	flags \|= ZFS_ITER_RECURSE;
	break;
	case 'S':
	received = B_TRUE;
	break;
	case '?':
	default:
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing property argument\n"));
	usage(B_FALSE);
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing dataset argument\n"));
	usage(B_FALSE);
	}

	propname = argv[0];
	argc--;
	argv++;

	if ((prop = zfs_name_to_prop(propname)) != ZPROP_INVAL) {
	if (zfs_prop_readonly(prop)) {
	(void) fprintf(stderr, gettext(
	"%s property is read-only\n"),
	propname);
	return (1);
	}
	if (!zfs_prop_inheritable(prop) && !received) {
	(void) fprintf(stderr, gettext("'%s' property cannot "
	"be inherited\n"), propname);
	if (prop == ZFS_PROP_QUOTA \|\|
	prop == ZFS_PROP_RESERVATION \|\|
	prop == ZFS_PROP_REFQUOTA \|\|
	prop == ZFS_PROP_REFRESERVATION) {
	(void) fprintf(stderr, gettext("use 'zfs set "
	"%s=none' to clear\n"), propname);
	(void) fprintf(stderr, gettext("use 'zfs "
	"inherit -S %s' to revert to received "
	"value\n"), propname);
	}
	return (1);
	}
	if (received && (prop == ZFS_PROP_VOLSIZE \|\|
	prop == ZFS_PROP_VERSION)) {
	(void) fprintf(stderr, gettext("'%s' property cannot "
	"be reverted to a received value\n"), propname);
	return (1);
	}
	} else if (!zfs_prop_user(propname)) {
	(void) fprintf(stderr, gettext("invalid property '%s'\n"),
	propname);
	usage(B_FALSE);
	}

	cb.cb_propname = propname;
	cb.cb_received = received;

	if (flags & ZFS_ITER_RECURSE) {
	ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
	NULL, NULL, 0, inherit_recurse_cb, &cb);
	} else {
	ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
	NULL, NULL, 0, inherit_cb, &cb);
	}

	return (ret);
	}

	typedef struct upgrade_cbdata {
	uint64_t cb_numupgraded;
	uint64_t cb_numsamegraded;
	uint64_t cb_numfailed;
	uint64_t cb_version;
	boolean_t cb_newer;
	boolean_t cb_foundone;
	char cb_lastfs[ZFS_MAX_DATASET_NAME_LEN];
	} upgrade_cbdata_t;

	static int
	same_pool(zfs_handle_t zhp, const char name)
	{
	int len1 = strcspn(name, "/@");
	const char *zhname = zfs_get_name(zhp);
	int len2 = strcspn(zhname, "/@");

	if (len1 != len2)
	return (B_FALSE);
	return (strncmp(name, zhname, len1) == 0);
	}

	static int
	upgrade_list_callback(zfs_handle_t zhp, void data)
	{
	upgrade_cbdata_t *cb = data;
	int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);

	/* list if it's old/new */
	if ((!cb->cb_newer && version < ZPL_VERSION) \|\|
	(cb->cb_newer && version > ZPL_VERSION)) {
	char *str;
	if (cb->cb_newer) {
	str = gettext("The following filesystems are "
	"formatted using a newer software version and\n"
	"cannot be accessed on the current system.\n\n");
	} else {
	str = gettext("The following filesystems are "
	"out of date, and can be upgraded. After being\n"
	"upgraded, these filesystems (and any 'zfs send' "
	"streams generated from\n"
	"subsequent snapshots) will no longer be "
	"accessible by older software versions.\n\n");
	}

	if (!cb->cb_foundone) {
	(void) puts(str);
	(void) printf(gettext("VER FILESYSTEM\n"));
	(void) printf(gettext("--- ------------\n"));
	cb->cb_foundone = B_TRUE;
	}

	(void) printf("%2u %s\n", version, zfs_get_name(zhp));
	}

	return (0);
	}

	static int
	upgrade_set_callback(zfs_handle_t zhp, void data)
	{
	upgrade_cbdata_t *cb = data;
	int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
	int needed_spa_version;
	int spa_version;

	if (zfs_spa_version(zhp, &spa_version) < 0)
	return (-1);

	needed_spa_version = zfs_spa_version_map(cb->cb_version);

	if (needed_spa_version < 0)
	return (-1);

	if (spa_version < needed_spa_version) {
	/* can't upgrade */
	(void) printf(gettext("%s: can not be "
	"upgraded; the pool version needs to first "
	"be upgraded\nto version %d\n\n"),
	zfs_get_name(zhp), needed_spa_version);
	cb->cb_numfailed++;
	return (0);
	}

	/* upgrade */
	if (version < cb->cb_version) {
	char verstr[16];
	(void) snprintf(verstr, sizeof (verstr),
	"%llu", (u_longlong_t)cb->cb_version);
	if (cb->cb_lastfs[0] && !same_pool(zhp, cb->cb_lastfs)) {
	/*
	* If they did "zfs upgrade -a", then we could
	* be doing ioctls to different pools. We need
	* to log this history once to each pool, and bypass
	* the normal history logging that happens in main().
	*/
	(void) zpool_log_history(g_zfs, history_str);
	log_history = B_FALSE;
	}
	if (zfs_prop_set(zhp, "version", verstr) == 0)
	cb->cb_numupgraded++;
	else
	cb->cb_numfailed++;
	(void) strcpy(cb->cb_lastfs, zfs_get_name(zhp));
	} else if (version > cb->cb_version) {
	/* can't downgrade */
	(void) printf(gettext("%s: can not be downgraded; "
	"it is already at version %u\n"),
	zfs_get_name(zhp), version);
	cb->cb_numfailed++;
	} else {
	cb->cb_numsamegraded++;
	}
	return (0);
	}

	/*
	* zfs upgrade
	* zfs upgrade -v
	* zfs upgrade [-r] [-V <version>] <-a \| filesystem>
	*/
	static int
	zfs_do_upgrade(int argc, char **argv)
	{
	boolean_t all = B_FALSE;
	boolean_t showversions = B_FALSE;
	int ret = 0;
	upgrade_cbdata_t cb = { 0 };
	int c;
	int flags = ZFS_ITER_ARGS_CAN_BE_PATHS;

	/* check options */
	while ((c = getopt(argc, argv, "rvV:a")) != -1) {
	switch (c) {
	case 'r':
	flags \|= ZFS_ITER_RECURSE;
	break;
	case 'v':
	showversions = B_TRUE;
	break;
	case 'V':
	if (zfs_prop_string_to_index(ZFS_PROP_VERSION,
	optarg, &cb.cb_version) != 0) {
	(void) fprintf(stderr,
	gettext("invalid version %s\n"), optarg);
	usage(B_FALSE);
	}
	break;
	case 'a':
	all = B_TRUE;
	break;
	case '?':
	default:
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if ((!all && !argc) && ((flags & ZFS_ITER_RECURSE) \| cb.cb_version))
	usage(B_FALSE);
	if (showversions && (flags & ZFS_ITER_RECURSE \|\| all \|\|
	cb.cb_version \|\| argc))
	usage(B_FALSE);
	if ((all \|\| argc) && (showversions))
	usage(B_FALSE);
	if (all && argc)
	usage(B_FALSE);

	if (showversions) {
	/* Show info on available versions. */
	(void) printf(gettext("The following filesystem versions are "
	"supported:\n\n"));
	(void) printf(gettext("VER DESCRIPTION\n"));
	(void) printf("--- -----------------------------------------"
	"---------------\n");
	(void) printf(gettext(" 1 Initial ZFS filesystem version\n"));
	(void) printf(gettext(" 2 Enhanced directory entries\n"));
	(void) printf(gettext(" 3 Case insensitive and filesystem "
	"user identifier (FUID)\n"));
	(void) printf(gettext(" 4 userquota, groupquota "
	"properties\n"));
	(void) printf(gettext(" 5 System attributes\n"));
	(void) printf(gettext("\nFor more information on a particular "
	"version, including supported releases,\n"));
	(void) printf("see the ZFS Administration Guide.\n\n");
	ret = 0;
	} else if (argc \|\| all) {
	/* Upgrade filesystems */
	if (cb.cb_version == 0)
	cb.cb_version = ZPL_VERSION;
	ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_FILESYSTEM,
	NULL, NULL, 0, upgrade_set_callback, &cb);
	(void) printf(gettext("%llu filesystems upgraded\n"),
	(u_longlong_t)cb.cb_numupgraded);
	if (cb.cb_numsamegraded) {
	(void) printf(gettext("%llu filesystems already at "
	"this version\n"),
	(u_longlong_t)cb.cb_numsamegraded);
	}
	if (cb.cb_numfailed != 0)
	ret = 1;
	} else {
	/* List old-version filesystems */
	boolean_t found;
	(void) printf(gettext("This system is currently running "
	"ZFS filesystem version %llu.\n\n"), ZPL_VERSION);

	flags \|= ZFS_ITER_RECURSE;
	ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
	NULL, NULL, 0, upgrade_list_callback, &cb);

	found = cb.cb_foundone;
	cb.cb_foundone = B_FALSE;
	cb.cb_newer = B_TRUE;

	ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
	NULL, NULL, 0, upgrade_list_callback, &cb);

	if (!cb.cb_foundone && !found) {
	(void) printf(gettext("All filesystems are "
	"formatted with the current version.\n"));
	}
	}

	return (ret);
	}

	/*
	* zfs userspace [-Hinp] [-o field[,...]] [-s field [-s field]...]
	* [-S field [-S field]...] [-t type[,...]]
	* filesystem \| snapshot \| path
	* zfs groupspace [-Hinp] [-o field[,...]] [-s field [-s field]...]
	* [-S field [-S field]...] [-t type[,...]]
	* filesystem \| snapshot \| path
	* zfs projectspace [-Hp] [-o field[,...]] [-s field [-s field]...]
	* [-S field [-S field]...] filesystem \| snapshot \| path
	*
	* -H Scripted mode; elide headers and separate columns by tabs.
	* -i Translate SID to POSIX ID.
	* -n Print numeric ID instead of user/group name.
	* -o Control which fields to display.
	* -p Use exact (parsable) numeric output.
	* -s Specify sort columns, descending order.
	* -S Specify sort columns, ascending order.
	* -t Control which object types to display.
	*
	* Displays space consumed by, and quotas on, each user in the specified
	* filesystem or snapshot.
	*/

	/* us_field_types, us_field_hdr and us_field_names should be kept in sync */
	enum us_field_types {
	USFIELD_TYPE,
	USFIELD_NAME,
	USFIELD_USED,
	USFIELD_QUOTA,
	USFIELD_OBJUSED,
	USFIELD_OBJQUOTA
	};
	static char *us_field_hdr[] = { "TYPE", "NAME", "USED", "QUOTA",
	"OBJUSED", "OBJQUOTA" };
	static char *us_field_names[] = { "type", "name", "used", "quota",
	"objused", "objquota" };
	#define USFIELD_LAST (sizeof (us_field_names) / sizeof (char *))

	#define USTYPE_PSX_GRP (1 << 0)
	#define USTYPE_PSX_USR (1 << 1)
	#define USTYPE_SMB_GRP (1 << 2)
	#define USTYPE_SMB_USR (1 << 3)
	#define USTYPE_PROJ (1 << 4)
	#define USTYPE_ALL \
	(USTYPE_PSX_GRP \| USTYPE_PSX_USR \| USTYPE_SMB_GRP \| USTYPE_SMB_USR \| \
	USTYPE_PROJ)

	static int us_type_bits[] = {
	USTYPE_PSX_GRP,
	USTYPE_PSX_USR,
	USTYPE_SMB_GRP,
	USTYPE_SMB_USR,
	USTYPE_ALL
	};
	static char *us_type_names[] = { "posixgroup", "posixuser", "smbgroup",
	"smbuser", "all" };

	typedef struct us_node {
	nvlist_t *usn_nvl;
	uu_avl_node_t usn_avlnode;
	uu_list_node_t usn_listnode;
	} us_node_t;

	typedef struct us_cbdata {
	nvlist_t **cb_nvlp;
	uu_avl_pool_t *cb_avl_pool;
	uu_avl_t *cb_avl;
	boolean_t cb_numname;
	boolean_t cb_nicenum;
	boolean_t cb_sid2posix;
	zfs_userquota_prop_t cb_prop;
	zfs_sort_column_t *cb_sortcol;
	size_t cb_width[USFIELD_LAST];
	} us_cbdata_t;

	static boolean_t us_populated = B_FALSE;

	typedef struct {
	zfs_sort_column_t *si_sortcol;
	boolean_t si_numname;
	} us_sort_info_t;

	static int
	us_field_index(char *field)
	{
	int i;

	for (i = 0; i < USFIELD_LAST; i++) {
	if (strcmp(field, us_field_names[i]) == 0)
	return (i);
	}

	return (-1);
	}

	static int
	us_compare(const void larg, const void rarg, void *unused)
	{
	const us_node_t *l = larg;
	const us_node_t *r = rarg;
	us_sort_info_t si = (us_sort_info_t )unused;
	zfs_sort_column_t *sortcol = si->si_sortcol;
	boolean_t numname = si->si_numname;
	nvlist_t *lnvl = l->usn_nvl;
	nvlist_t *rnvl = r->usn_nvl;
	int rc = 0;
	boolean_t lvb, rvb;

	for (; sortcol != NULL; sortcol = sortcol->sc_next) {
	char *lvstr = "";
	char *rvstr = "";
	uint32_t lv32 = 0;
	uint32_t rv32 = 0;
	uint64_t lv64 = 0;
	uint64_t rv64 = 0;
	zfs_prop_t prop = sortcol->sc_prop;
	const char *propname = NULL;
	boolean_t reverse = sortcol->sc_reverse;

	switch (prop) {
	case ZFS_PROP_TYPE:
	propname = "type";
	(void) nvlist_lookup_uint32(lnvl, propname, &lv32);
	(void) nvlist_lookup_uint32(rnvl, propname, &rv32);
	if (rv32 != lv32)
	rc = (rv32 < lv32) ? 1 : -1;
	break;
	case ZFS_PROP_NAME:
	propname = "name";
	if (numname) {
	compare_nums:
	(void) nvlist_lookup_uint64(lnvl, propname,
	&lv64);
	(void) nvlist_lookup_uint64(rnvl, propname,
	&rv64);
	if (rv64 != lv64)
	rc = (rv64 < lv64) ? 1 : -1;
	} else {
	if ((nvlist_lookup_string(lnvl, propname,
	&lvstr) == ENOENT) \|\|
	(nvlist_lookup_string(rnvl, propname,
	&rvstr) == ENOENT)) {
	goto compare_nums;
	}
	rc = strcmp(lvstr, rvstr);
	}
	break;
	case ZFS_PROP_USED:
	case ZFS_PROP_QUOTA:
	if (!us_populated)
	break;
	if (prop == ZFS_PROP_USED)
	propname = "used";
	else
	propname = "quota";
	(void) nvlist_lookup_uint64(lnvl, propname, &lv64);
	(void) nvlist_lookup_uint64(rnvl, propname, &rv64);
	if (rv64 != lv64)
	rc = (rv64 < lv64) ? 1 : -1;
	break;

	default:
	break;
	}

	if (rc != 0) {
	if (rc < 0)
	return (reverse ? 1 : -1);
	else
	return (reverse ? -1 : 1);
	}
	}

	/*
	* If entries still seem to be the same, check if they are of the same
	* type (smbentity is added only if we are doing SID to POSIX ID
	* translation where we can have duplicate type/name combinations).
	*/
	if (nvlist_lookup_boolean_value(lnvl, "smbentity", &lvb) == 0 &&
	nvlist_lookup_boolean_value(rnvl, "smbentity", &rvb) == 0 &&
	lvb != rvb)
	return (lvb < rvb ? -1 : 1);

	return (0);
	}

	static boolean_t
	zfs_prop_is_user(unsigned p)
	{
	return (p == ZFS_PROP_USERUSED \|\| p == ZFS_PROP_USERQUOTA \|\|
	p == ZFS_PROP_USEROBJUSED \|\| p == ZFS_PROP_USEROBJQUOTA);
	}

	static boolean_t
	zfs_prop_is_group(unsigned p)
	{
	return (p == ZFS_PROP_GROUPUSED \|\| p == ZFS_PROP_GROUPQUOTA \|\|
	p == ZFS_PROP_GROUPOBJUSED \|\| p == ZFS_PROP_GROUPOBJQUOTA);
	}

	static boolean_t
	zfs_prop_is_project(unsigned p)
	{
	return (p == ZFS_PROP_PROJECTUSED \|\| p == ZFS_PROP_PROJECTQUOTA \|\|
	p == ZFS_PROP_PROJECTOBJUSED \|\| p == ZFS_PROP_PROJECTOBJQUOTA);
	}

	static inline const char *
	us_type2str(unsigned field_type)
	{
	switch (field_type) {
	case USTYPE_PSX_USR:
	return ("POSIX User");
	case USTYPE_PSX_GRP:
	return ("POSIX Group");
	case USTYPE_SMB_USR:
	return ("SMB User");
	case USTYPE_SMB_GRP:
	return ("SMB Group");
	case USTYPE_PROJ:
	return ("Project");
	default:
	return ("Undefined");
	}
	}

	static int
	userspace_cb(void arg, const char domain, uid_t rid, uint64_t space)
	{
	us_cbdata_t cb = (us_cbdata_t )arg;
	zfs_userquota_prop_t prop = cb->cb_prop;
	char *name = NULL;
	char *propname;
	char sizebuf[32];
	us_node_t *node;
	uu_avl_pool_t *avl_pool = cb->cb_avl_pool;
	uu_avl_t *avl = cb->cb_avl;
	uu_avl_index_t idx;
	nvlist_t *props;
	us_node_t *n;
	zfs_sort_column_t *sortcol = cb->cb_sortcol;
	unsigned type = 0;
	const char *typestr;
	size_t namelen;
	size_t typelen;
	size_t sizelen;
	int typeidx, nameidx, sizeidx;
	us_sort_info_t sortinfo = { sortcol, cb->cb_numname };
	boolean_t smbentity = B_FALSE;

	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
	nomem();
	node = safe_malloc(sizeof (us_node_t));
	uu_avl_node_init(node, &node->usn_avlnode, avl_pool);
	node->usn_nvl = props;

	if (domain != NULL && domain[0] != '\0') {
	#ifdef HAVE_IDMAP
	/* SMB */
	char sid[MAXNAMELEN + 32];
	uid_t id;
	uint64_t classes;
	int err;
	directory_error_t e;

	smbentity = B_TRUE;

	(void) snprintf(sid, sizeof (sid), "%s-%u", domain, rid);

	if (prop == ZFS_PROP_GROUPUSED \|\| prop == ZFS_PROP_GROUPQUOTA) {
	type = USTYPE_SMB_GRP;
	err = sid_to_id(sid, B_FALSE, &id);
	} else {
	type = USTYPE_SMB_USR;
	err = sid_to_id(sid, B_TRUE, &id);
	}

	if (err == 0) {
	rid = id;
	if (!cb->cb_sid2posix) {
	e = directory_name_from_sid(NULL, sid, &name,
	&classes);
	if (e != NULL)
	directory_error_free(e);
	if (name == NULL)
	name = sid;
	}
	}
	#else
	nvlist_free(props);
	free(node);

	return (-1);
	#endif /* HAVE_IDMAP */
	}

	if (cb->cb_sid2posix \|\| domain == NULL \|\| domain[0] == '\0') {
	/* POSIX or -i */
	if (zfs_prop_is_group(prop)) {
	type = USTYPE_PSX_GRP;
	if (!cb->cb_numname) {
	struct group *g;

	if ((g = getgrgid(rid)) != NULL)
	name = g->gr_name;
	}
	} else if (zfs_prop_is_user(prop)) {
	type = USTYPE_PSX_USR;
	if (!cb->cb_numname) {
	struct passwd *p;

	if ((p = getpwuid(rid)) != NULL)
	name = p->pw_name;
	}
	} else {
	type = USTYPE_PROJ;
	}
	}

	/*
	* Make sure that the type/name combination is unique when doing
	* SID to POSIX ID translation (hence changing the type from SMB to
	* POSIX).
	*/
	if (cb->cb_sid2posix &&
	nvlist_add_boolean_value(props, "smbentity", smbentity) != 0)
	nomem();

	/* Calculate/update width of TYPE field */
	typestr = us_type2str(type);
	typelen = strlen(gettext(typestr));
	typeidx = us_field_index("type");
	if (typelen > cb->cb_width[typeidx])
	cb->cb_width[typeidx] = typelen;
	if (nvlist_add_uint32(props, "type", type) != 0)
	nomem();

	/* Calculate/update width of NAME field */
	if ((cb->cb_numname && cb->cb_sid2posix) \|\| name == NULL) {
	if (nvlist_add_uint64(props, "name", rid) != 0)
	nomem();
	namelen = snprintf(NULL, 0, "%u", rid);
	} else {
	if (nvlist_add_string(props, "name", name) != 0)
	nomem();
	namelen = strlen(name);
	}
	nameidx = us_field_index("name");
	if (nameidx >= 0 && namelen > cb->cb_width[nameidx])
	cb->cb_width[nameidx] = namelen;

	/*
	* Check if this type/name combination is in the list and update it;
	* otherwise add new node to the list.
	*/
	if ((n = uu_avl_find(avl, node, &sortinfo, &idx)) == NULL) {
	uu_avl_insert(avl, node, idx);
	} else {
	nvlist_free(props);
	free(node);
	node = n;
	props = node->usn_nvl;
	}

	/* Calculate/update width of USED/QUOTA fields */
	if (cb->cb_nicenum) {
	if (prop == ZFS_PROP_USERUSED \|\| prop == ZFS_PROP_GROUPUSED \|\|
	prop == ZFS_PROP_USERQUOTA \|\| prop == ZFS_PROP_GROUPQUOTA \|\|
	prop == ZFS_PROP_PROJECTUSED \|\|
	prop == ZFS_PROP_PROJECTQUOTA) {
	zfs_nicebytes(space, sizebuf, sizeof (sizebuf));
	} else {
	zfs_nicenum(space, sizebuf, sizeof (sizebuf));
	}
	} else {
	(void) snprintf(sizebuf, sizeof (sizebuf), "%llu",
	(u_longlong_t)space);
	}
	sizelen = strlen(sizebuf);
	if (prop == ZFS_PROP_USERUSED \|\| prop == ZFS_PROP_GROUPUSED \|\|
	prop == ZFS_PROP_PROJECTUSED) {
	propname = "used";
	if (!nvlist_exists(props, "quota"))
	(void) nvlist_add_uint64(props, "quota", 0);
	} else if (prop == ZFS_PROP_USERQUOTA \|\| prop == ZFS_PROP_GROUPQUOTA \|\|
	prop == ZFS_PROP_PROJECTQUOTA) {
	propname = "quota";
	if (!nvlist_exists(props, "used"))
	(void) nvlist_add_uint64(props, "used", 0);
	} else if (prop == ZFS_PROP_USEROBJUSED \|\|
	prop == ZFS_PROP_GROUPOBJUSED \|\| prop == ZFS_PROP_PROJECTOBJUSED) {
	propname = "objused";
	if (!nvlist_exists(props, "objquota"))
	(void) nvlist_add_uint64(props, "objquota", 0);
	} else if (prop == ZFS_PROP_USEROBJQUOTA \|\|
	prop == ZFS_PROP_GROUPOBJQUOTA \|\|
	prop == ZFS_PROP_PROJECTOBJQUOTA) {
	propname = "objquota";
	if (!nvlist_exists(props, "objused"))
	(void) nvlist_add_uint64(props, "objused", 0);
	} else {
	return (-1);
	}
	sizeidx = us_field_index(propname);
	if (sizeidx >= 0 && sizelen > cb->cb_width[sizeidx])
	cb->cb_width[sizeidx] = sizelen;

	if (nvlist_add_uint64(props, propname, space) != 0)
	nomem();

	return (0);
	}

	static void
	print_us_node(boolean_t scripted, boolean_t parsable, int *fields, int types,
	size_t width, us_node_t node)
	{
	nvlist_t *nvl = node->usn_nvl;
	char valstr[MAXNAMELEN];
	boolean_t first = B_TRUE;
	int cfield = 0;
	int field;
	uint32_t ustype;

	/* Check type */
	(void) nvlist_lookup_uint32(nvl, "type", &ustype);
	if (!(ustype & types))
	return;

	while ((field = fields[cfield]) != USFIELD_LAST) {
	nvpair_t *nvp = NULL;
	data_type_t type;
	uint32_t val32;
	uint64_t val64;
	char *strval = "-";

	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
	if (strcmp(nvpair_name(nvp),
	us_field_names[field]) == 0)
	break;
	}

	type = nvp == NULL ? DATA_TYPE_UNKNOWN : nvpair_type(nvp);
	switch (type) {
	case DATA_TYPE_UINT32:
	(void) nvpair_value_uint32(nvp, &val32);
	break;
	case DATA_TYPE_UINT64:
	(void) nvpair_value_uint64(nvp, &val64);
	break;
	case DATA_TYPE_STRING:
	(void) nvpair_value_string(nvp, &strval);
	break;
	case DATA_TYPE_UNKNOWN:
	break;
	default:
	(void) fprintf(stderr, "invalid data type\n");
	}

	switch (field) {
	case USFIELD_TYPE:
	if (type == DATA_TYPE_UINT32)
	strval = (char *)us_type2str(val32);
	break;
	case USFIELD_NAME:
	if (type == DATA_TYPE_UINT64) {
	(void) sprintf(valstr, "%llu",
	(u_longlong_t)val64);
	strval = valstr;
	}
	break;
	case USFIELD_USED:
	case USFIELD_QUOTA:
	if (type == DATA_TYPE_UINT64) {
	if (parsable) {
	(void) sprintf(valstr, "%llu",
	(u_longlong_t)val64);
	strval = valstr;
	} else if (field == USFIELD_QUOTA &&
	val64 == 0) {
	strval = "none";
	} else {
	zfs_nicebytes(val64, valstr,
	sizeof (valstr));
	strval = valstr;
	}
	}
	break;
	case USFIELD_OBJUSED:
	case USFIELD_OBJQUOTA:
	if (type == DATA_TYPE_UINT64) {
	if (parsable) {
	(void) sprintf(valstr, "%llu",
	(u_longlong_t)val64);
	strval = valstr;
	} else if (field == USFIELD_OBJQUOTA &&
	val64 == 0) {
	strval = "none";
	} else {
	zfs_nicenum(val64, valstr,
	sizeof (valstr));
	strval = valstr;
	}
	}
	break;
	}

	if (!first) {
	if (scripted)
	(void) printf("\t");
	else
	(void) printf(" ");
	}
	if (scripted)
	(void) printf("%s", strval);
	else if (field == USFIELD_TYPE \|\| field == USFIELD_NAME)
	(void) printf("%-*s", (int)width[field], strval);
	else
	(void) printf("%*s", (int)width[field], strval);

	first = B_FALSE;
	cfield++;
	}

	(void) printf("\n");
	}

	static void
	print_us(boolean_t scripted, boolean_t parsable, int *fields, int types,
	size_t width, boolean_t rmnode, uu_avl_t avl)
	{
	us_node_t *node;
	const char *col;
	int cfield = 0;
	int field;

	if (!scripted) {
	boolean_t first = B_TRUE;

	while ((field = fields[cfield]) != USFIELD_LAST) {
	col = gettext(us_field_hdr[field]);
	if (field == USFIELD_TYPE \|\| field == USFIELD_NAME) {
	(void) printf(first ? "%-s" : " %-s",
	(int)width[field], col);
	} else {
	(void) printf(first ? "%s" : " %s",
	(int)width[field], col);
	}
	first = B_FALSE;
	cfield++;
	}
	(void) printf("\n");
	}

	for (node = uu_avl_first(avl); node; node = uu_avl_next(avl, node)) {
	print_us_node(scripted, parsable, fields, types, width, node);
	if (rmnode)
	nvlist_free(node->usn_nvl);
	}
	}

	static int
	zfs_do_userspace(int argc, char **argv)
	{
	zfs_handle_t *zhp;
	zfs_userquota_prop_t p;
	uu_avl_pool_t *avl_pool;
	uu_avl_t *avl_tree;
	uu_avl_walk_t *walk;
	char *delim;
	char deffields[] = "type,name,used,quota,objused,objquota";
	char *ofield = NULL;
	char *tfield = NULL;
	int cfield = 0;
	int fields[256];
	int i;
	boolean_t scripted = B_FALSE;
	boolean_t prtnum = B_FALSE;
	boolean_t parsable = B_FALSE;
	boolean_t sid2posix = B_FALSE;
	int ret = 0;
	int c;
	zfs_sort_column_t *sortcol = NULL;
	int types = USTYPE_PSX_USR \| USTYPE_SMB_USR;
	us_cbdata_t cb;
	us_node_t *node;
	us_node_t *rmnode;
	uu_list_pool_t *listpool;
	uu_list_t *list;
	uu_avl_index_t idx = 0;
	uu_list_index_t idx2 = 0;

	if (argc < 2)
	usage(B_FALSE);

	if (strcmp(argv[0], "groupspace") == 0) {
	/* Toggle default group types */
	types = USTYPE_PSX_GRP \| USTYPE_SMB_GRP;
	} else if (strcmp(argv[0], "projectspace") == 0) {
	types = USTYPE_PROJ;
	prtnum = B_TRUE;
	}

	while ((c = getopt(argc, argv, "nHpo:s:S:t:i")) != -1) {
	switch (c) {
	case 'n':
	if (types == USTYPE_PROJ) {
	(void) fprintf(stderr,
	gettext("invalid option 'n'\n"));
	usage(B_FALSE);
	}
	prtnum = B_TRUE;
	break;
	case 'H':
	scripted = B_TRUE;
	break;
	case 'p':
	parsable = B_TRUE;
	break;
	case 'o':
	ofield = optarg;
	break;
	case 's':
	case 'S':
	if (zfs_add_sort_column(&sortcol, optarg,
	c == 's' ? B_FALSE : B_TRUE) != 0) {
	(void) fprintf(stderr,
	gettext("invalid field '%s'\n"), optarg);
	usage(B_FALSE);
	}
	break;
	case 't':
	if (types == USTYPE_PROJ) {
	(void) fprintf(stderr,
	gettext("invalid option 't'\n"));
	usage(B_FALSE);
	}
	tfield = optarg;
	break;
	case 'i':
	if (types == USTYPE_PROJ) {
	(void) fprintf(stderr,
	gettext("invalid option 'i'\n"));
	usage(B_FALSE);
	}
	sid2posix = B_TRUE;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing dataset name\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	/* Use default output fields if not specified using -o */
	if (ofield == NULL)
	ofield = deffields;
	do {
	if ((delim = strchr(ofield, ',')) != NULL)
	*delim = '\0';
	if ((fields[cfield++] = us_field_index(ofield)) == -1) {
	(void) fprintf(stderr, gettext("invalid type '%s' "
	"for -o option\n"), ofield);
	return (-1);
	}
	if (delim != NULL)
	ofield = delim + 1;
	} while (delim != NULL);
	fields[cfield] = USFIELD_LAST;

	/* Override output types (-t option) */
	if (tfield != NULL) {
	types = 0;

	do {
	boolean_t found = B_FALSE;

	if ((delim = strchr(tfield, ',')) != NULL)
	*delim = '\0';
	for (i = 0; i < sizeof (us_type_bits) / sizeof (int);
	i++) {
	if (strcmp(tfield, us_type_names[i]) == 0) {
	found = B_TRUE;
	types \|= us_type_bits[i];
	break;
	}
	}
	if (!found) {
	(void) fprintf(stderr, gettext("invalid type "
	"'%s' for -t option\n"), tfield);
	return (-1);
	}
	if (delim != NULL)
	tfield = delim + 1;
	} while (delim != NULL);
	}

	if ((zhp = zfs_path_to_zhandle(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM \|
	ZFS_TYPE_SNAPSHOT)) == NULL)
	return (1);
	if (zhp->zfs_head_type != ZFS_TYPE_FILESYSTEM) {
	(void) fprintf(stderr, gettext("operation is only applicable "
	"to filesystems and their snapshots\n"));
	zfs_close(zhp);
	return (1);
	}

	if ((avl_pool = uu_avl_pool_create("us_avl_pool", sizeof (us_node_t),
	offsetof(us_node_t, usn_avlnode), us_compare, UU_DEFAULT)) == NULL)
	nomem();
	if ((avl_tree = uu_avl_create(avl_pool, NULL, UU_DEFAULT)) == NULL)
	nomem();

	/* Always add default sorting columns */
	(void) zfs_add_sort_column(&sortcol, "type", B_FALSE);
	(void) zfs_add_sort_column(&sortcol, "name", B_FALSE);

	cb.cb_sortcol = sortcol;
	cb.cb_numname = prtnum;
	cb.cb_nicenum = !parsable;
	cb.cb_avl_pool = avl_pool;
	cb.cb_avl = avl_tree;
	cb.cb_sid2posix = sid2posix;

	for (i = 0; i < USFIELD_LAST; i++)
	cb.cb_width[i] = strlen(gettext(us_field_hdr[i]));

	for (p = 0; p < ZFS_NUM_USERQUOTA_PROPS; p++) {
	if ((zfs_prop_is_user(p) &&
	!(types & (USTYPE_PSX_USR \| USTYPE_SMB_USR))) \|\|
	(zfs_prop_is_group(p) &&
	!(types & (USTYPE_PSX_GRP \| USTYPE_SMB_GRP))) \|\|
	(zfs_prop_is_project(p) && types != USTYPE_PROJ))
	continue;

	cb.cb_prop = p;
	if ((ret = zfs_userspace(zhp, p, userspace_cb, &cb)) != 0) {
	zfs_close(zhp);
	return (ret);
	}
	}
	zfs_close(zhp);

	/* Sort the list */
	if ((node = uu_avl_first(avl_tree)) == NULL)
	return (0);

	us_populated = B_TRUE;

	listpool = uu_list_pool_create("tmplist", sizeof (us_node_t),
	offsetof(us_node_t, usn_listnode), NULL, UU_DEFAULT);
	list = uu_list_create(listpool, NULL, UU_DEFAULT);
	uu_list_node_init(node, &node->usn_listnode, listpool);

	while (node != NULL) {
	rmnode = node;
	node = uu_avl_next(avl_tree, node);
	uu_avl_remove(avl_tree, rmnode);
	if (uu_list_find(list, rmnode, NULL, &idx2) == NULL)
	uu_list_insert(list, rmnode, idx2);
	}

	for (node = uu_list_first(list); node != NULL;
	node = uu_list_next(list, node)) {
	us_sort_info_t sortinfo = { sortcol, cb.cb_numname };

	if (uu_avl_find(avl_tree, node, &sortinfo, &idx) == NULL)
	uu_avl_insert(avl_tree, node, idx);
	}

	uu_list_destroy(list);
	uu_list_pool_destroy(listpool);

	/* Print and free node nvlist memory */
	print_us(scripted, parsable, fields, types, cb.cb_width, B_TRUE,
	cb.cb_avl);

	zfs_free_sort_columns(sortcol);

	/* Clean up the AVL tree */
	if ((walk = uu_avl_walk_start(cb.cb_avl, UU_WALK_ROBUST)) == NULL)
	nomem();

	while ((node = uu_avl_walk_next(walk)) != NULL) {
	uu_avl_remove(cb.cb_avl, node);
	free(node);
	}

	uu_avl_walk_end(walk);
	uu_avl_destroy(avl_tree);
	uu_avl_pool_destroy(avl_pool);

	return (ret);
	}

	/*
	* list [-Hp][-r\|-d max] [-o property[,...]] [-s property] ... [-S property]
	* [-t type[,...]] [filesystem\|volume\|snapshot] ...
	*
	* -H Scripted mode; elide headers and separate columns by tabs
	* -p Display values in parsable (literal) format.
	* -r Recurse over all children
	* -d Limit recursion by depth.
	* -o Control which fields to display.
	* -s Specify sort columns, descending order.
	* -S Specify sort columns, ascending order.
	* -t Control which object types to display.
	*
	* When given no arguments, list all filesystems in the system.
	* Otherwise, list the specified datasets, optionally recursing down them if
	* '-r' is specified.
	*/
	typedef struct list_cbdata {
	boolean_t cb_first;
	boolean_t cb_literal;
	boolean_t cb_scripted;
	zprop_list_t *cb_proplist;
	} list_cbdata_t;

	/*
	* Given a list of columns to display, output appropriate headers for each one.
	*/
	static void
	print_header(list_cbdata_t *cb)
	{
	zprop_list_t *pl = cb->cb_proplist;
	char headerbuf[ZFS_MAXPROPLEN];
	const char *header;
	int i;
	boolean_t first = B_TRUE;
	boolean_t right_justify;

	for (; pl != NULL; pl = pl->pl_next) {
	if (!first) {
	(void) printf(" ");
	} else {
	first = B_FALSE;
	}

	right_justify = B_FALSE;
	if (pl->pl_prop != ZPROP_INVAL) {
	header = zfs_prop_column_name(pl->pl_prop);
	right_justify = zfs_prop_align_right(pl->pl_prop);
	} else {
	for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
	headerbuf[i] = toupper(pl->pl_user_prop[i]);
	headerbuf[i] = '\0';
	header = headerbuf;
	}

	if (pl->pl_next == NULL && !right_justify)
	(void) printf("%s", header);
	else if (right_justify)
	(void) printf("%*s", (int)pl->pl_width, header);
	else
	(void) printf("%-*s", (int)pl->pl_width, header);
	}

	(void) printf("\n");
	}

	/*
	* Given a dataset and a list of fields, print out all the properties according
	* to the described layout.
	*/
	static void
	print_dataset(zfs_handle_t zhp, list_cbdata_t cb)
	{
	zprop_list_t *pl = cb->cb_proplist;
	boolean_t first = B_TRUE;
	char property[ZFS_MAXPROPLEN];
	nvlist_t *userprops = zfs_get_user_props(zhp);
	nvlist_t *propval;
	char *propstr;
	boolean_t right_justify;

	for (; pl != NULL; pl = pl->pl_next) {
	if (!first) {
	if (cb->cb_scripted)
	(void) printf("\t");
	else
	(void) printf(" ");
	} else {
	first = B_FALSE;
	}

	if (pl->pl_prop == ZFS_PROP_NAME) {
	(void) strlcpy(property, zfs_get_name(zhp),
	sizeof (property));
	propstr = property;
	right_justify = zfs_prop_align_right(pl->pl_prop);
	} else if (pl->pl_prop != ZPROP_INVAL) {
	if (zfs_prop_get(zhp, pl->pl_prop, property,
	sizeof (property), NULL, NULL, 0,
	cb->cb_literal) != 0)
	propstr = "-";
	else
	propstr = property;
	right_justify = zfs_prop_align_right(pl->pl_prop);
	} else if (zfs_prop_userquota(pl->pl_user_prop)) {
	if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
	property, sizeof (property), cb->cb_literal) != 0)
	propstr = "-";
	else
	propstr = property;
	right_justify = B_TRUE;
	} else if (zfs_prop_written(pl->pl_user_prop)) {
	if (zfs_prop_get_written(zhp, pl->pl_user_prop,
	property, sizeof (property), cb->cb_literal) != 0)
	propstr = "-";
	else
	propstr = property;
	right_justify = B_TRUE;
	} else {
	if (nvlist_lookup_nvlist(userprops,
	pl->pl_user_prop, &propval) != 0)
	propstr = "-";
	else
	verify(nvlist_lookup_string(propval,
	ZPROP_VALUE, &propstr) == 0);
	right_justify = B_FALSE;
	}

	/*
	* If this is being called in scripted mode, or if this is the
	* last column and it is left-justified, don't include a width
	* format specifier.
	*/
	if (cb->cb_scripted \|\| (pl->pl_next == NULL && !right_justify))
	(void) printf("%s", propstr);
	else if (right_justify)
	(void) printf("%*s", (int)pl->pl_width, propstr);
	else
	(void) printf("%-*s", (int)pl->pl_width, propstr);
	}

	(void) printf("\n");
	}

	/*
	* Generic callback function to list a dataset or snapshot.
	*/
	static int
	list_callback(zfs_handle_t zhp, void data)
	{
	list_cbdata_t *cbp = data;

	if (cbp->cb_first) {
	if (!cbp->cb_scripted)
	print_header(cbp);
	cbp->cb_first = B_FALSE;
	}

	print_dataset(zhp, cbp);

	return (0);
	}

	static int
	zfs_do_list(int argc, char **argv)
	{
	int c;
	static char default_fields[] =
	"name,used,available,referenced,mountpoint";
	int types = ZFS_TYPE_DATASET;
	boolean_t types_specified = B_FALSE;
	char *fields = NULL;
	list_cbdata_t cb = { 0 };
	char *value;
	int limit = 0;
	int ret = 0;
	zfs_sort_column_t *sortcol = NULL;
	int flags = ZFS_ITER_PROP_LISTSNAPS \| ZFS_ITER_ARGS_CAN_BE_PATHS;

	/* check options */
	while ((c = getopt(argc, argv, "HS:d:o:prs:t:")) != -1) {
	switch (c) {
	case 'o':
	fields = optarg;
	break;
	case 'p':
	cb.cb_literal = B_TRUE;
	flags \|= ZFS_ITER_LITERAL_PROPS;
	break;
	case 'd':
	limit = parse_depth(optarg, &flags);
	break;
	case 'r':
	flags \|= ZFS_ITER_RECURSE;
	break;
	case 'H':
	cb.cb_scripted = B_TRUE;
	break;
	case 's':
	if (zfs_add_sort_column(&sortcol, optarg,
	B_FALSE) != 0) {
	(void) fprintf(stderr,
	gettext("invalid property '%s'\n"), optarg);
	usage(B_FALSE);
	}
	break;
	case 'S':
	if (zfs_add_sort_column(&sortcol, optarg,
	B_TRUE) != 0) {
	(void) fprintf(stderr,
	gettext("invalid property '%s'\n"), optarg);
	usage(B_FALSE);
	}
	break;
	case 't':
	types = 0;
	types_specified = B_TRUE;
	flags &= ~ZFS_ITER_PROP_LISTSNAPS;
	while (*optarg != '\0') {
	static char *type_subopts[] = { "filesystem",
	"volume", "snapshot", "snap", "bookmark",
	"all", NULL };

	switch (getsubopt(&optarg, type_subopts,
	&value)) {
	case 0:
	types \|= ZFS_TYPE_FILESYSTEM;
	break;
	case 1:
	types \|= ZFS_TYPE_VOLUME;
	break;
	case 2:
	case 3:
	types \|= ZFS_TYPE_SNAPSHOT;
	break;
	case 4:
	types \|= ZFS_TYPE_BOOKMARK;
	break;
	case 5:
	types = ZFS_TYPE_DATASET \|
	ZFS_TYPE_BOOKMARK;
	break;
	default:
	(void) fprintf(stderr,
	gettext("invalid type '%s'\n"),
	value);
	usage(B_FALSE);
	}
	}
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (fields == NULL)
	fields = default_fields;

	/*
	* If we are only going to list snapshot names and sort by name,
	* then we can use faster version.
	*/
	if (strcmp(fields, "name") == 0 && zfs_sort_only_by_name(sortcol))
	flags \|= ZFS_ITER_SIMPLE;

	/*
	* If "-o space" and no types were specified, don't display snapshots.
	*/
	if (strcmp(fields, "space") == 0 && types_specified == B_FALSE)
	types &= ~ZFS_TYPE_SNAPSHOT;

	/*
	* Handle users who want to list all snapshots or bookmarks
	* of the current dataset (ex. 'zfs list -t snapshot <dataset>').
	*/
	if ((types == ZFS_TYPE_SNAPSHOT \|\| types == ZFS_TYPE_BOOKMARK) &&
	argc > 0 && (flags & ZFS_ITER_RECURSE) == 0 && limit == 0) {
	flags \|= (ZFS_ITER_DEPTH_LIMIT \| ZFS_ITER_RECURSE);
	limit = 1;
	}

	/*
	* If the user specifies '-o all', the zprop_get_list() doesn't
	* normally include the name of the dataset. For 'zfs list', we always
	* want this property to be first.
	*/
	if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
	!= 0)
	usage(B_FALSE);

	cb.cb_first = B_TRUE;

	ret = zfs_for_each(argc, argv, flags, types, sortcol, &cb.cb_proplist,
	limit, list_callback, &cb);

	zprop_free_list(cb.cb_proplist);
	zfs_free_sort_columns(sortcol);

	if (ret == 0 && cb.cb_first && !cb.cb_scripted)
	(void) fprintf(stderr, gettext("no datasets available\n"));

	return (ret);
	}

	/*
	* zfs rename [-fu] <fs \| snap \| vol> <fs \| snap \| vol>
	* zfs rename [-f] -p <fs \| vol> <fs \| vol>
	* zfs rename [-u] -r <snap> <snap>
	*
	* Renames the given dataset to another of the same type.
	*
	* The '-p' flag creates all the non-existing ancestors of the target first.
	* The '-u' flag prevents file systems from being remounted during rename.
	*/
	/* ARGSUSED */
	static int
	zfs_do_rename(int argc, char **argv)
	{
	zfs_handle_t *zhp;
	renameflags_t flags = { 0 };
	int c;
	int ret = 0;
	int types;
	boolean_t parents = B_FALSE;

	/* check options */
	while ((c = getopt(argc, argv, "pruf")) != -1) {
	switch (c) {
	case 'p':
	parents = B_TRUE;
	break;
	case 'r':
	flags.recursive = B_TRUE;
	break;
	case 'u':
	flags.nounmount = B_TRUE;
	break;
	case 'f':
	flags.forceunmount = B_TRUE;
	break;
	case '?':
	default:
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing source dataset "
	"argument\n"));
	usage(B_FALSE);
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing target dataset "
	"argument\n"));
	usage(B_FALSE);
	}
	if (argc > 2) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	if (flags.recursive && parents) {
	(void) fprintf(stderr, gettext("-p and -r options are mutually "
	"exclusive\n"));
	usage(B_FALSE);
	}

	if (flags.nounmount && parents) {
	(void) fprintf(stderr, gettext("-u and -p options are mutually "
	"exclusive\n"));
	usage(B_FALSE);
	}

	if (flags.recursive && strchr(argv[0], '@') == 0) {
	(void) fprintf(stderr, gettext("source dataset for recursive "
	"rename must be a snapshot\n"));
	usage(B_FALSE);
	}

	if (flags.nounmount)
	types = ZFS_TYPE_FILESYSTEM;
	else if (parents)
	types = ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME;
	else
	types = ZFS_TYPE_DATASET;

	if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL)
	return (1);

	/* If we were asked and the name looks good, try to create ancestors. */
	if (parents && zfs_name_valid(argv[1], zfs_get_type(zhp)) &&
	zfs_create_ancestors(g_zfs, argv[1]) != 0) {
	zfs_close(zhp);
	return (1);
	}

	ret = (zfs_rename(zhp, argv[1], flags) != 0);

	zfs_close(zhp);
	return (ret);
	}

	/*
	* zfs promote <fs>
	*
	* Promotes the given clone fs to be the parent
	*/
	/* ARGSUSED */
	static int
	zfs_do_promote(int argc, char **argv)
	{
	zfs_handle_t *zhp;
	int ret = 0;

	/* check options */
	if (argc > 1 && argv[1][0] == '-') {
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	argv[1][1]);
	usage(B_FALSE);
	}

	/* check number of arguments */
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing clone filesystem"
	" argument\n"));
	usage(B_FALSE);
	}
	if (argc > 2) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL)
	return (1);

	ret = (zfs_promote(zhp) != 0);


	zfs_close(zhp);
	return (ret);
	}

	static int
	zfs_do_redact(int argc, char **argv)
	{
	char *snap = NULL;
	char *bookname = NULL;
	char **rsnaps = NULL;
	int numrsnaps = 0;
	argv++;
	argc--;
	if (argc < 3) {
	(void) fprintf(stderr, gettext("too few arguments\n"));
	usage(B_FALSE);
	}

	snap = argv[0];
	bookname = argv[1];
	rsnaps = argv + 2;
	numrsnaps = argc - 2;

	nvlist_t *rsnapnv = fnvlist_alloc();

	for (int i = 0; i < numrsnaps; i++) {
	fnvlist_add_boolean(rsnapnv, rsnaps[i]);
	}

	int err = lzc_redact(snap, bookname, rsnapnv);
	fnvlist_free(rsnapnv);

	switch (err) {
	case 0:
	break;
	case ENOENT:
	(void) fprintf(stderr,
	gettext("provided snapshot %s does not exist\n"), snap);
	break;
	case EEXIST:
	(void) fprintf(stderr, gettext("specified redaction bookmark "
	"(%s) provided already exists\n"), bookname);
	break;
	case ENAMETOOLONG:
	(void) fprintf(stderr, gettext("provided bookmark name cannot "
	"be used, final name would be too long\n"));
	break;
	case E2BIG:
	(void) fprintf(stderr, gettext("too many redaction snapshots "
	"specified\n"));
	break;
	case EINVAL:
	if (strchr(bookname, '#') != NULL)
	(void) fprintf(stderr, gettext(
	"redaction bookmark name must not contain '#'\n"));
	else
	(void) fprintf(stderr, gettext(
	"redaction snapshot must be descendent of "
	"snapshot being redacted\n"));
	break;
	case EALREADY:
	(void) fprintf(stderr, gettext("attempted to redact redacted "
	"dataset or with respect to redacted dataset\n"));
	break;
	case ENOTSUP:
	(void) fprintf(stderr, gettext("redaction bookmarks feature "
	"not enabled\n"));
	break;
	case EXDEV:
	(void) fprintf(stderr, gettext("potentially invalid redaction "
	"snapshot; full dataset names required\n"));
	break;
	default:
	(void) fprintf(stderr, gettext("internal error: %s\n"),
	strerror(errno));
	}

	return (err);
	}

	/*
	* zfs rollback [-rRf] <snapshot>
	*
	* -r Delete any intervening snapshots before doing rollback
	* -R Delete any snapshots and their clones
	* -f ignored for backwards compatibility
	*
	* Given a filesystem, rollback to a specific snapshot, discarding any changes
	* since then and making it the active dataset. If more recent snapshots exist,
	* the command will complain unless the '-r' flag is given.
	*/
	typedef struct rollback_cbdata {
	uint64_t cb_create;
	uint8_t cb_younger_ds_printed;
	boolean_t cb_first;
	int cb_doclones;
	char *cb_target;
	int cb_error;
	boolean_t cb_recurse;
	} rollback_cbdata_t;

	static int
	rollback_check_dependent(zfs_handle_t zhp, void data)
	{
	rollback_cbdata_t *cbp = data;

	if (cbp->cb_first && cbp->cb_recurse) {
	(void) fprintf(stderr, gettext("cannot rollback to "
	"'%s': clones of previous snapshots exist\n"),
	cbp->cb_target);
	(void) fprintf(stderr, gettext("use '-R' to "
	"force deletion of the following clones and "
	"dependents:\n"));
	cbp->cb_first = 0;
	cbp->cb_error = 1;
	}

	(void) fprintf(stderr, "%s\n", zfs_get_name(zhp));

	zfs_close(zhp);
	return (0);
	}


	/*
	* Report some snapshots/bookmarks more recent than the one specified.
	* Used when '-r' is not specified. We reuse this same callback for the
	* snapshot dependents - if 'cb_dependent' is set, then this is a
	* dependent and we should report it without checking the transaction group.
	*/
	static int
	rollback_check(zfs_handle_t zhp, void data)
	{
	rollback_cbdata_t *cbp = data;
	/*
	* Max number of younger snapshots and/or bookmarks to display before
	* we stop the iteration.
	*/
	const uint8_t max_younger = 32;

	if (cbp->cb_doclones) {
	zfs_close(zhp);
	return (0);
	}

	if (zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) > cbp->cb_create) {
	if (cbp->cb_first && !cbp->cb_recurse) {
	(void) fprintf(stderr, gettext("cannot "
	"rollback to '%s': more recent snapshots "
	"or bookmarks exist\n"),
	cbp->cb_target);
	(void) fprintf(stderr, gettext("use '-r' to "
	"force deletion of the following "
	"snapshots and bookmarks:\n"));
	cbp->cb_first = 0;
	cbp->cb_error = 1;
	}

	if (cbp->cb_recurse) {
	if (zfs_iter_dependents(zhp, B_TRUE,
	rollback_check_dependent, cbp) != 0) {
	zfs_close(zhp);
	return (-1);
	}
	} else {
	(void) fprintf(stderr, "%s\n",
	zfs_get_name(zhp));
	cbp->cb_younger_ds_printed++;
	}
	}
	zfs_close(zhp);

	if (cbp->cb_younger_ds_printed == max_younger) {
	/*
	* This non-recursive rollback is going to fail due to the
	* presence of snapshots and/or bookmarks that are younger than
	* the rollback target.
	* We printed some of the offending objects, now we stop
	* zfs_iter_snapshot/bookmark iteration so we can fail fast and
	* avoid iterating over the rest of the younger objects
	*/
	(void) fprintf(stderr, gettext("Output limited to %d "
	"snapshots/bookmarks\n"), max_younger);
	return (-1);
	}
	return (0);
	}

	static int
	zfs_do_rollback(int argc, char **argv)
	{
	int ret = 0;
	int c;
	boolean_t force = B_FALSE;
	rollback_cbdata_t cb = { 0 };
	zfs_handle_t zhp, snap;
	char parentname[ZFS_MAX_DATASET_NAME_LEN];
	char *delim;
	uint64_t min_txg = 0;

	/* check options */
	while ((c = getopt(argc, argv, "rRf")) != -1) {
	switch (c) {
	case 'r':
	cb.cb_recurse = 1;
	break;
	case 'R':
	cb.cb_recurse = 1;
	cb.cb_doclones = 1;
	break;
	case 'f':
	force = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing dataset argument\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	/* open the snapshot */
	if ((snap = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
	return (1);

	/* open the parent dataset */
	(void) strlcpy(parentname, argv[0], sizeof (parentname));
	verify((delim = strrchr(parentname, '@')) != NULL);
	*delim = '\0';
	if ((zhp = zfs_open(g_zfs, parentname, ZFS_TYPE_DATASET)) == NULL) {
	zfs_close(snap);
	return (1);
	}

	/*
	* Check for more recent snapshots and/or clones based on the presence
	* of '-r' and '-R'.
	*/
	cb.cb_target = argv[0];
	cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
	cb.cb_first = B_TRUE;
	cb.cb_error = 0;

	if (cb.cb_create > 0)
	min_txg = cb.cb_create;

	if ((ret = zfs_iter_snapshots(zhp, B_FALSE, rollback_check, &cb,
	min_txg, 0)) != 0)
	goto out;
	if ((ret = zfs_iter_bookmarks(zhp, rollback_check, &cb)) != 0)
	goto out;

	if ((ret = cb.cb_error) != 0)
	goto out;

	/*
	* Rollback parent to the given snapshot.
	*/
	ret = zfs_rollback(zhp, snap, force);

	out:
	zfs_close(snap);
	zfs_close(zhp);

	if (ret == 0)
	return (0);
	else
	return (1);
	}

	/*
	* zfs set property=value ... { fs \| snap \| vol } ...
	*
	* Sets the given properties for all datasets specified on the command line.
	*/

	static int
	set_callback(zfs_handle_t zhp, void data)
	{
	nvlist_t *props = data;

	if (zfs_prop_set_list(zhp, props) != 0) {
	switch (libzfs_errno(g_zfs)) {
	case EZFS_MOUNTFAILED:
	(void) fprintf(stderr, gettext("property may be set "
	"but unable to remount filesystem\n"));
	break;
	case EZFS_SHARENFSFAILED:
	(void) fprintf(stderr, gettext("property may be set "
	"but unable to reshare filesystem\n"));
	break;
	}
	return (1);
	}
	return (0);
	}

	static int
	zfs_do_set(int argc, char **argv)
	{
	nvlist_t *props = NULL;
	int ds_start = -1; /* argv idx of first dataset arg */
	int ret = 0;
	int i;

	/* check for options */
	if (argc > 1 && argv[1][0] == '-') {
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	argv[1][1]);
	usage(B_FALSE);
	}

	/* check number of arguments */
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing arguments\n"));
	usage(B_FALSE);
	}
	if (argc < 3) {
	if (strchr(argv[1], '=') == NULL) {
	(void) fprintf(stderr, gettext("missing property=value "
	"argument(s)\n"));
	} else {
	(void) fprintf(stderr, gettext("missing dataset "
	"name(s)\n"));
	}
	usage(B_FALSE);
	}

	/* validate argument order: prop=val args followed by dataset args */
	for (i = 1; i < argc; i++) {
	if (strchr(argv[i], '=') != NULL) {
	if (ds_start > 0) {
	/* out-of-order prop=val argument */
	(void) fprintf(stderr, gettext("invalid "
	"argument order\n"));
	usage(B_FALSE);
	}
	} else if (ds_start < 0) {
	ds_start = i;
	}
	}
	if (ds_start < 0) {
	(void) fprintf(stderr, gettext("missing dataset name(s)\n"));
	usage(B_FALSE);
	}

	/* Populate a list of property settings */
	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
	nomem();
	for (i = 1; i < ds_start; i++) {
	if (!parseprop(props, argv[i])) {
	ret = -1;
	goto error;
	}
	}

	ret = zfs_for_each(argc - ds_start, argv + ds_start, 0,
	ZFS_TYPE_DATASET, NULL, NULL, 0, set_callback, props);

	error:
	nvlist_free(props);
	return (ret);
	}

	typedef struct snap_cbdata {
	nvlist_t *sd_nvl;
	boolean_t sd_recursive;
	const char *sd_snapname;
	} snap_cbdata_t;

	static int
	zfs_snapshot_cb(zfs_handle_t zhp, void arg)
	{
	snap_cbdata_t *sd = arg;
	char *name;
	int rv = 0;
	int error;

	if (sd->sd_recursive &&
	zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) != 0) {
	zfs_close(zhp);
	return (0);
	}

	error = asprintf(&name, "%s@%s", zfs_get_name(zhp), sd->sd_snapname);
	if (error == -1)
	nomem();
	fnvlist_add_boolean(sd->sd_nvl, name);
	free(name);

	if (sd->sd_recursive)
	rv = zfs_iter_filesystems(zhp, zfs_snapshot_cb, sd);
	zfs_close(zhp);
	return (rv);
	}

	/*
	* zfs snapshot [-r] [-o prop=value] ... <fs@snap>
	*
	* Creates a snapshot with the given name. While functionally equivalent to
	* 'zfs create', it is a separate command to differentiate intent.
	*/
	static int
	zfs_do_snapshot(int argc, char **argv)
	{
	int ret = 0;
	int c;
	nvlist_t *props;
	snap_cbdata_t sd = { 0 };
	boolean_t multiple_snaps = B_FALSE;

	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
	nomem();
	if (nvlist_alloc(&sd.sd_nvl, NV_UNIQUE_NAME, 0) != 0)
	nomem();

	/* check options */
	while ((c = getopt(argc, argv, "ro:")) != -1) {
	switch (c) {
	case 'o':
	if (!parseprop(props, optarg)) {
	nvlist_free(sd.sd_nvl);
	nvlist_free(props);
	return (1);
	}
	break;
	case 'r':
	sd.sd_recursive = B_TRUE;
	multiple_snaps = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	goto usage;
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing snapshot argument\n"));
	goto usage;
	}

	if (argc > 1)
	multiple_snaps = B_TRUE;
	for (; argc > 0; argc--, argv++) {
	char *atp;
	zfs_handle_t *zhp;

	atp = strchr(argv[0], '@');
	if (atp == NULL)
	goto usage;
	*atp = '\0';
	sd.sd_snapname = atp + 1;
	zhp = zfs_open(g_zfs, argv[0],
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL)
	goto usage;
	if (zfs_snapshot_cb(zhp, &sd) != 0)
	goto usage;
	}

	ret = zfs_snapshot_nvl(g_zfs, sd.sd_nvl, props);
	nvlist_free(sd.sd_nvl);
	nvlist_free(props);
	if (ret != 0 && multiple_snaps)
	(void) fprintf(stderr, gettext("no snapshots were created\n"));
	return (ret != 0);

	usage:
	nvlist_free(sd.sd_nvl);
	nvlist_free(props);
	usage(B_FALSE);
	return (-1);
	}


	/*
	* Send a backup stream to stdout.
	*/
	static int
	zfs_do_send(int argc, char **argv)
	{
	char *fromname = NULL;
	char *toname = NULL;
	char *resume_token = NULL;
	char *cp;
	zfs_handle_t *zhp;
	sendflags_t flags = { 0 };
	int c, err;
	nvlist_t *dbgnv = NULL;
	char *redactbook = NULL;

	struct option long_options[] = {
	{"replicate", no_argument, NULL, 'R'},
	{"skip-missing", no_argument, NULL, 's'},
	{"redact", required_argument, NULL, 'd'},
	{"props", no_argument, NULL, 'p'},
	{"parsable", no_argument, NULL, 'P'},
	{"dedup", no_argument, NULL, 'D'},
	{"verbose", no_argument, NULL, 'v'},
	{"dryrun", no_argument, NULL, 'n'},
	{"large-block", no_argument, NULL, 'L'},
	{"embed", no_argument, NULL, 'e'},
	{"resume", required_argument, NULL, 't'},
	{"compressed", no_argument, NULL, 'c'},
	{"raw", no_argument, NULL, 'w'},
	{"backup", no_argument, NULL, 'b'},
	{"holds", no_argument, NULL, 'h'},
	{"saved", no_argument, NULL, 'S'},
	{0, 0, 0, 0}
	};

	/* check options */
	while ((c = getopt_long(argc, argv, ":i:I:RsDpvnPLeht:cwbd:S",
	long_options, NULL)) != -1) {
	switch (c) {
	case 'i':
	if (fromname)
	usage(B_FALSE);
	fromname = optarg;
	break;
	case 'I':
	if (fromname)
	usage(B_FALSE);
	fromname = optarg;
	flags.doall = B_TRUE;
	break;
	case 'R':
	flags.replicate = B_TRUE;
	break;
	case 's':
	flags.skipmissing = B_TRUE;
	break;
	case 'd':
	redactbook = optarg;
	break;
	case 'p':
	flags.props = B_TRUE;
	break;
	case 'b':
	flags.backup = B_TRUE;
	break;
	case 'h':
	flags.holds = B_TRUE;
	break;
	case 'P':
	flags.parsable = B_TRUE;
	break;
	case 'v':
	flags.verbosity++;
	flags.progress = B_TRUE;
	break;
	case 'D':
	(void) fprintf(stderr,
	gettext("WARNING: deduplicated send is no "
	"longer supported. A regular,\n"
	"non-deduplicated stream will be generated.\n\n"));
	break;
	case 'n':
	flags.dryrun = B_TRUE;
	break;
	case 'L':
	flags.largeblock = B_TRUE;
	break;
	case 'e':
	flags.embed_data = B_TRUE;
	break;
	case 't':
	resume_token = optarg;
	break;
	case 'c':
	flags.compress = B_TRUE;
	break;
	case 'w':
	flags.raw = B_TRUE;
	flags.compress = B_TRUE;
	flags.embed_data = B_TRUE;
	flags.largeblock = B_TRUE;
	break;
	case 'S':
	flags.saved = B_TRUE;
	break;
	case ':':
	/*
	* If a parameter was not passed, optopt contains the
	* value that would normally lead us into the
	* appropriate case statement. If it's > 256, then this
	* must be a longopt and we should look at argv to get
	* the string. Otherwise it's just the character, so we
	* should use it directly.
	*/
	if (optopt <= UINT8_MAX) {
	(void) fprintf(stderr,
	gettext("missing argument for '%c' "
	"option\n"), optopt);
	} else {
	(void) fprintf(stderr,
	gettext("missing argument for '%s' "
	"option\n"), argv[optind - 1]);
	}
	usage(B_FALSE);
	break;
	case '?':
	/FALLTHROUGH/
	default:
	/*
	* If an invalid flag was passed, optopt contains the
	* character if it was a short flag, or 0 if it was a
	* longopt.
	*/
	if (optopt != 0) {
	(void) fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	} else {
	(void) fprintf(stderr,
	gettext("invalid option '%s'\n"),
	argv[optind - 1]);

	}
	usage(B_FALSE);
	}
	}

	if (flags.parsable && flags.verbosity == 0)
	flags.verbosity = 1;

	argc -= optind;
	argv += optind;

	if (resume_token != NULL) {
	if (fromname != NULL \|\| flags.replicate \|\| flags.props \|\|
	flags.backup \|\| flags.holds \|\|
	flags.saved \|\| redactbook != NULL) {
	(void) fprintf(stderr,
	gettext("invalid flags combined with -t\n"));
	usage(B_FALSE);
	}
	if (argc > 0) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}
	} else {
	if (argc < 1) {
	(void) fprintf(stderr,
	gettext("missing snapshot argument\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}
	}

	if (flags.saved) {
	if (fromname != NULL \|\| flags.replicate \|\| flags.props \|\|
	flags.doall \|\| flags.backup \|\|
	flags.holds \|\| flags.largeblock \|\| flags.embed_data \|\|
	flags.compress \|\| flags.raw \|\| redactbook != NULL) {
	(void) fprintf(stderr, gettext("incompatible flags "
	"combined with saved send flag\n"));
	usage(B_FALSE);
	}
	if (strchr(argv[0], '@') != NULL) {
	(void) fprintf(stderr, gettext("saved send must "
	"specify the dataset with partially-received "
	"state\n"));
	usage(B_FALSE);
	}
	}

	if (flags.raw && redactbook != NULL) {
	(void) fprintf(stderr,
	gettext("Error: raw sends may not be redacted.\n"));
	return (1);
	}

	if (!flags.dryrun && isatty(STDOUT_FILENO)) {
	(void) fprintf(stderr,
	gettext("Error: Stream can not be written to a terminal.\n"
	"You must redirect standard output.\n"));
	return (1);
	}

	if (flags.saved) {
	zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET);
	if (zhp == NULL)
	return (1);

	err = zfs_send_saved(zhp, &flags, STDOUT_FILENO,
	resume_token);
	if (err != 0)
	note_dev_error(errno, STDOUT_FILENO);
	zfs_close(zhp);
	return (err != 0);
	} else if (resume_token != NULL) {
	err = zfs_send_resume(g_zfs, &flags, STDOUT_FILENO,
	resume_token);
	if (err != 0)
	note_dev_error(errno, STDOUT_FILENO);
	return (err);
	}

	if (flags.skipmissing && !flags.replicate) {
	(void) fprintf(stderr,
	gettext("skip-missing flag can only be used in "
	"conjunction with replicate\n"));
	usage(B_FALSE);
	}

	/*
	* For everything except -R and -I, use the new, cleaner code path.
	*/
	if (!(flags.replicate \|\| flags.doall)) {
	char frombuf[ZFS_MAX_DATASET_NAME_LEN];

	if (fromname != NULL && (strchr(fromname, '#') == NULL &&
	strchr(fromname, '@') == NULL)) {
	/*
	* Neither bookmark or snapshot was specified. Print a
	* warning, and assume snapshot.
	*/
	(void) fprintf(stderr, "Warning: incremental source "
	"didn't specify type, assuming snapshot. Use '@' "
	"or '#' prefix to avoid ambiguity.\n");
	(void) snprintf(frombuf, sizeof (frombuf), "@%s",
	fromname);
	fromname = frombuf;
	}
	if (fromname != NULL &&
	(fromname[0] == '#' \|\| fromname[0] == '@')) {
	/*
	* Incremental source name begins with # or @.
	* Default to same fs as target.
	*/
	char tmpbuf[ZFS_MAX_DATASET_NAME_LEN];
	(void) strlcpy(tmpbuf, fromname, sizeof (tmpbuf));
	(void) strlcpy(frombuf, argv[0], sizeof (frombuf));
	cp = strchr(frombuf, '@');
	if (cp != NULL)
	*cp = '\0';
	(void) strlcat(frombuf, tmpbuf, sizeof (frombuf));
	fromname = frombuf;
	}

	zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET);
	if (zhp == NULL)
	return (1);
	err = zfs_send_one(zhp, fromname, STDOUT_FILENO, &flags,
	redactbook);
	zfs_close(zhp);
	if (err != 0)
	note_dev_error(errno, STDOUT_FILENO);
	return (err != 0);
	}

	if (fromname != NULL && strchr(fromname, '#')) {
	(void) fprintf(stderr,
	gettext("Error: multiple snapshots cannot be "
	"sent from a bookmark.\n"));
	return (1);
	}

	if (redactbook != NULL) {
	(void) fprintf(stderr, gettext("Error: multiple snapshots "
	"cannot be sent redacted.\n"));
	return (1);
	}

	if ((cp = strchr(argv[0], '@')) == NULL) {
	(void) fprintf(stderr, gettext("Error: "
	"Unsupported flag with filesystem or bookmark.\n"));
	return (1);
	}
	*cp = '\0';
	toname = cp + 1;
	zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL)
	return (1);

	/*
	* If they specified the full path to the snapshot, chop off
	* everything except the short name of the snapshot, but special
	* case if they specify the origin.
	*/
	if (fromname && (cp = strchr(fromname, '@')) != NULL) {
	char origin[ZFS_MAX_DATASET_NAME_LEN];
	zprop_source_t src;

	(void) zfs_prop_get(zhp, ZFS_PROP_ORIGIN,
	origin, sizeof (origin), &src, NULL, 0, B_FALSE);

	if (strcmp(origin, fromname) == 0) {
	fromname = NULL;
	flags.fromorigin = B_TRUE;
	} else {
	*cp = '\0';
	if (cp != fromname && strcmp(argv[0], fromname)) {
	(void) fprintf(stderr,
	gettext("incremental source must be "
	"in same filesystem\n"));
	usage(B_FALSE);
	}
	fromname = cp + 1;
	if (strchr(fromname, '@') \|\| strchr(fromname, '/')) {
	(void) fprintf(stderr,
	gettext("invalid incremental source\n"));
	usage(B_FALSE);
	}
	}
	}

	if (flags.replicate && fromname == NULL)
	flags.doall = B_TRUE;

	err = zfs_send(zhp, fromname, toname, &flags, STDOUT_FILENO, NULL, 0,
	flags.verbosity >= 3 ? &dbgnv : NULL);

	if (flags.verbosity >= 3 && dbgnv != NULL) {
	/*
	* dump_nvlist prints to stdout, but that's been
	* redirected to a file. Make it print to stderr
	* instead.
	*/
	(void) dup2(STDERR_FILENO, STDOUT_FILENO);
	dump_nvlist(dbgnv, 0);
	nvlist_free(dbgnv);
	}
	zfs_close(zhp);
	note_dev_error(errno, STDOUT_FILENO);

	return (err != 0);
	}

	/*
	* Restore a backup stream from stdin.
	*/
	static int
	zfs_do_receive(int argc, char **argv)
	{
	int c, err = 0;
	recvflags_t flags = { 0 };
	boolean_t abort_resumable = B_FALSE;
	nvlist_t *props;

	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
	nomem();

	/* check options */
	while ((c = getopt(argc, argv, ":o:x:dehMnuvFsA")) != -1) {
	switch (c) {
	case 'o':
	if (!parseprop(props, optarg)) {
	nvlist_free(props);
	usage(B_FALSE);
	}
	break;
	case 'x':
	if (!parsepropname(props, optarg)) {
	nvlist_free(props);
	usage(B_FALSE);
	}
	break;
	case 'd':
	if (flags.istail) {
	(void) fprintf(stderr, gettext("invalid option "
	"combination: -d and -e are mutually "
	"exclusive\n"));
	usage(B_FALSE);
	}
	flags.isprefix = B_TRUE;
	break;
	case 'e':
	if (flags.isprefix) {
	(void) fprintf(stderr, gettext("invalid option "
	"combination: -d and -e are mutually "
	"exclusive\n"));
	usage(B_FALSE);
	}
	flags.istail = B_TRUE;
	break;
	case 'h':
	flags.skipholds = B_TRUE;
	break;
	case 'M':
	flags.forceunmount = B_TRUE;
	break;
	case 'n':
	flags.dryrun = B_TRUE;
	break;
	case 'u':
	flags.nomount = B_TRUE;
	break;
	case 'v':
	flags.verbose = B_TRUE;
	break;
	case 's':
	flags.resumable = B_TRUE;
	break;
	case 'F':
	flags.force = B_TRUE;
	break;
	case 'A':
	abort_resumable = B_TRUE;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* zfs recv -e (use "tail" name) implies -d (remove dataset "head") */
	if (flags.istail)
	flags.isprefix = B_TRUE;

	/* check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing snapshot argument\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	if (abort_resumable) {
	if (flags.isprefix \|\| flags.istail \|\| flags.dryrun \|\|
	flags.resumable \|\| flags.nomount) {
	(void) fprintf(stderr, gettext("invalid option\n"));
	usage(B_FALSE);
	}

	char namebuf[ZFS_MAX_DATASET_NAME_LEN];
	(void) snprintf(namebuf, sizeof (namebuf),
	"%s/%%recv", argv[0]);

	if (zfs_dataset_exists(g_zfs, namebuf,
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME)) {
	zfs_handle_t *zhp = zfs_open(g_zfs,
	namebuf, ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL) {
	nvlist_free(props);
	return (1);
	}
	err = zfs_destroy(zhp, B_FALSE);
	zfs_close(zhp);
	} else {
	zfs_handle_t *zhp = zfs_open(g_zfs,
	argv[0], ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL)
	usage(B_FALSE);
	if (!zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) \|\|
	zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
	NULL, 0, NULL, NULL, 0, B_TRUE) == -1) {
	(void) fprintf(stderr,
	gettext("'%s' does not have any "
	"resumable receive state to abort\n"),
	argv[0]);
	nvlist_free(props);
	zfs_close(zhp);
	return (1);
	}
	err = zfs_destroy(zhp, B_FALSE);
	zfs_close(zhp);
	}
	nvlist_free(props);
	return (err != 0);
	}

	if (isatty(STDIN_FILENO)) {
	(void) fprintf(stderr,
	gettext("Error: Backup stream can not be read "
	"from a terminal.\n"
	"You must redirect standard input.\n"));
	nvlist_free(props);
	return (1);
	}
	err = zfs_receive(g_zfs, argv[0], props, &flags, STDIN_FILENO, NULL);
	nvlist_free(props);

	return (err != 0);
	}

	/*
	* allow/unallow stuff
	*/
	/* copied from zfs/sys/dsl_deleg.h */
	#define ZFS_DELEG_PERM_CREATE "create"
	#define ZFS_DELEG_PERM_DESTROY "destroy"
	#define ZFS_DELEG_PERM_SNAPSHOT "snapshot"
	#define ZFS_DELEG_PERM_ROLLBACK "rollback"
	#define ZFS_DELEG_PERM_CLONE "clone"
	#define ZFS_DELEG_PERM_PROMOTE "promote"
	#define ZFS_DELEG_PERM_RENAME "rename"
	#define ZFS_DELEG_PERM_MOUNT "mount"
	#define ZFS_DELEG_PERM_SHARE "share"
	#define ZFS_DELEG_PERM_SEND "send"
	#define ZFS_DELEG_PERM_RECEIVE "receive"
	#define ZFS_DELEG_PERM_ALLOW "allow"
	#define ZFS_DELEG_PERM_USERPROP "userprop"
	#define ZFS_DELEG_PERM_VSCAN "vscan" /* ??? */
	#define ZFS_DELEG_PERM_USERQUOTA "userquota"
	#define ZFS_DELEG_PERM_GROUPQUOTA "groupquota"
	#define ZFS_DELEG_PERM_USERUSED "userused"
	#define ZFS_DELEG_PERM_GROUPUSED "groupused"
	#define ZFS_DELEG_PERM_USEROBJQUOTA "userobjquota"
	#define ZFS_DELEG_PERM_GROUPOBJQUOTA "groupobjquota"
	#define ZFS_DELEG_PERM_USEROBJUSED "userobjused"
	#define ZFS_DELEG_PERM_GROUPOBJUSED "groupobjused"

	#define ZFS_DELEG_PERM_HOLD "hold"
	#define ZFS_DELEG_PERM_RELEASE "release"
	#define ZFS_DELEG_PERM_DIFF "diff"
	#define ZFS_DELEG_PERM_BOOKMARK "bookmark"
	#define ZFS_DELEG_PERM_LOAD_KEY "load-key"
	#define ZFS_DELEG_PERM_CHANGE_KEY "change-key"

	#define ZFS_DELEG_PERM_PROJECTUSED "projectused"
	#define ZFS_DELEG_PERM_PROJECTQUOTA "projectquota"
	#define ZFS_DELEG_PERM_PROJECTOBJUSED "projectobjused"
	#define ZFS_DELEG_PERM_PROJECTOBJQUOTA "projectobjquota"

	#define ZFS_NUM_DELEG_NOTES ZFS_DELEG_NOTE_NONE

	static zfs_deleg_perm_tab_t zfs_deleg_perm_tbl[] = {
	{ ZFS_DELEG_PERM_ALLOW, ZFS_DELEG_NOTE_ALLOW },
	{ ZFS_DELEG_PERM_CLONE, ZFS_DELEG_NOTE_CLONE },
	{ ZFS_DELEG_PERM_CREATE, ZFS_DELEG_NOTE_CREATE },
	{ ZFS_DELEG_PERM_DESTROY, ZFS_DELEG_NOTE_DESTROY },
	{ ZFS_DELEG_PERM_DIFF, ZFS_DELEG_NOTE_DIFF},
	{ ZFS_DELEG_PERM_HOLD, ZFS_DELEG_NOTE_HOLD },
	{ ZFS_DELEG_PERM_MOUNT, ZFS_DELEG_NOTE_MOUNT },
	{ ZFS_DELEG_PERM_PROMOTE, ZFS_DELEG_NOTE_PROMOTE },
	{ ZFS_DELEG_PERM_RECEIVE, ZFS_DELEG_NOTE_RECEIVE },
	{ ZFS_DELEG_PERM_RELEASE, ZFS_DELEG_NOTE_RELEASE },
	{ ZFS_DELEG_PERM_RENAME, ZFS_DELEG_NOTE_RENAME },
	{ ZFS_DELEG_PERM_ROLLBACK, ZFS_DELEG_NOTE_ROLLBACK },
	{ ZFS_DELEG_PERM_SEND, ZFS_DELEG_NOTE_SEND },
	{ ZFS_DELEG_PERM_SHARE, ZFS_DELEG_NOTE_SHARE },
	{ ZFS_DELEG_PERM_SNAPSHOT, ZFS_DELEG_NOTE_SNAPSHOT },
	{ ZFS_DELEG_PERM_BOOKMARK, ZFS_DELEG_NOTE_BOOKMARK },
	{ ZFS_DELEG_PERM_LOAD_KEY, ZFS_DELEG_NOTE_LOAD_KEY },
	{ ZFS_DELEG_PERM_CHANGE_KEY, ZFS_DELEG_NOTE_CHANGE_KEY },

	{ ZFS_DELEG_PERM_GROUPQUOTA, ZFS_DELEG_NOTE_GROUPQUOTA },
	{ ZFS_DELEG_PERM_GROUPUSED, ZFS_DELEG_NOTE_GROUPUSED },
	{ ZFS_DELEG_PERM_USERPROP, ZFS_DELEG_NOTE_USERPROP },
	{ ZFS_DELEG_PERM_USERQUOTA, ZFS_DELEG_NOTE_USERQUOTA },
	{ ZFS_DELEG_PERM_USERUSED, ZFS_DELEG_NOTE_USERUSED },
	{ ZFS_DELEG_PERM_USEROBJQUOTA, ZFS_DELEG_NOTE_USEROBJQUOTA },
	{ ZFS_DELEG_PERM_USEROBJUSED, ZFS_DELEG_NOTE_USEROBJUSED },
	{ ZFS_DELEG_PERM_GROUPOBJQUOTA, ZFS_DELEG_NOTE_GROUPOBJQUOTA },
	{ ZFS_DELEG_PERM_GROUPOBJUSED, ZFS_DELEG_NOTE_GROUPOBJUSED },
	{ ZFS_DELEG_PERM_PROJECTUSED, ZFS_DELEG_NOTE_PROJECTUSED },
	{ ZFS_DELEG_PERM_PROJECTQUOTA, ZFS_DELEG_NOTE_PROJECTQUOTA },
	{ ZFS_DELEG_PERM_PROJECTOBJUSED, ZFS_DELEG_NOTE_PROJECTOBJUSED },
	{ ZFS_DELEG_PERM_PROJECTOBJQUOTA, ZFS_DELEG_NOTE_PROJECTOBJQUOTA },
	{ NULL, ZFS_DELEG_NOTE_NONE }
	};

	/* permission structure */
	typedef struct deleg_perm {
	zfs_deleg_who_type_t dp_who_type;
	const char *dp_name;
	boolean_t dp_local;
	boolean_t dp_descend;
	} deleg_perm_t;

	/* */
	typedef struct deleg_perm_node {
	deleg_perm_t dpn_perm;

	uu_avl_node_t dpn_avl_node;
	} deleg_perm_node_t;

	typedef struct fs_perm fs_perm_t;

	/* permissions set */
	typedef struct who_perm {
	zfs_deleg_who_type_t who_type;
	const char who_name; / id */
	char who_ug_name[256]; /* user/group name */
	fs_perm_t who_fsperm; / uplink */

	uu_avl_t who_deleg_perm_avl; / permissions */
	} who_perm_t;

	/* */
	typedef struct who_perm_node {
	who_perm_t who_perm;
	uu_avl_node_t who_avl_node;
	} who_perm_node_t;

	typedef struct fs_perm_set fs_perm_set_t;
	/* fs permissions */
	struct fs_perm {
	const char *fsp_name;

	uu_avl_t fsp_sc_avl; / sets,create */
	uu_avl_t fsp_uge_avl; / user,group,everyone */

	fs_perm_set_t fsp_set; / uplink */
	};

	/* */
	typedef struct fs_perm_node {
	fs_perm_t fspn_fsperm;
	uu_avl_t *fspn_avl;

	uu_list_node_t fspn_list_node;
	} fs_perm_node_t;

	/* top level structure */
	struct fs_perm_set {
	uu_list_pool_t *fsps_list_pool;
	uu_list_t fsps_list; / list of fs_perms */

	uu_avl_pool_t *fsps_named_set_avl_pool;
	uu_avl_pool_t *fsps_who_perm_avl_pool;
	uu_avl_pool_t *fsps_deleg_perm_avl_pool;
	};

	static inline const char *
	deleg_perm_type(zfs_deleg_note_t note)
	{
	/* subcommands */
	switch (note) {
	/* SUBCOMMANDS */
	/* OTHER */
	case ZFS_DELEG_NOTE_GROUPQUOTA:
	case ZFS_DELEG_NOTE_GROUPUSED:
	case ZFS_DELEG_NOTE_USERPROP:
	case ZFS_DELEG_NOTE_USERQUOTA:
	case ZFS_DELEG_NOTE_USERUSED:
	case ZFS_DELEG_NOTE_USEROBJQUOTA:
	case ZFS_DELEG_NOTE_USEROBJUSED:
	case ZFS_DELEG_NOTE_GROUPOBJQUOTA:
	case ZFS_DELEG_NOTE_GROUPOBJUSED:
	case ZFS_DELEG_NOTE_PROJECTUSED:
	case ZFS_DELEG_NOTE_PROJECTQUOTA:
	case ZFS_DELEG_NOTE_PROJECTOBJUSED:
	case ZFS_DELEG_NOTE_PROJECTOBJQUOTA:
	/* other */
	return (gettext("other"));
	default:
	return (gettext("subcommand"));
	}
	}

	static int
	who_type2weight(zfs_deleg_who_type_t who_type)
	{
	int res;
	switch (who_type) {
	case ZFS_DELEG_NAMED_SET_SETS:
	case ZFS_DELEG_NAMED_SET:
	res = 0;
	break;
	case ZFS_DELEG_CREATE_SETS:
	case ZFS_DELEG_CREATE:
	res = 1;
	break;
	case ZFS_DELEG_USER_SETS:
	case ZFS_DELEG_USER:
	res = 2;
	break;
	case ZFS_DELEG_GROUP_SETS:
	case ZFS_DELEG_GROUP:
	res = 3;
	break;
	case ZFS_DELEG_EVERYONE_SETS:
	case ZFS_DELEG_EVERYONE:
	res = 4;
	break;
	default:
	res = -1;
	}

	return (res);
	}

	/* ARGSUSED */
	static int
	who_perm_compare(const void larg, const void rarg, void *unused)
	{
	const who_perm_node_t *l = larg;
	const who_perm_node_t *r = rarg;
	zfs_deleg_who_type_t ltype = l->who_perm.who_type;
	zfs_deleg_who_type_t rtype = r->who_perm.who_type;
	int lweight = who_type2weight(ltype);
	int rweight = who_type2weight(rtype);
	int res = lweight - rweight;
	if (res == 0)
	res = strncmp(l->who_perm.who_name, r->who_perm.who_name,
	ZFS_MAX_DELEG_NAME-1);

	if (res == 0)
	return (0);
	if (res > 0)
	return (1);
	else
	return (-1);
	}

	/* ARGSUSED */
	static int
	deleg_perm_compare(const void larg, const void rarg, void *unused)
	{
	const deleg_perm_node_t *l = larg;
	const deleg_perm_node_t *r = rarg;
	int res = strncmp(l->dpn_perm.dp_name, r->dpn_perm.dp_name,
	ZFS_MAX_DELEG_NAME-1);

	if (res == 0)
	return (0);

	if (res > 0)
	return (1);
	else
	return (-1);
	}

	static inline void
	fs_perm_set_init(fs_perm_set_t *fspset)
	{
	bzero(fspset, sizeof (fs_perm_set_t));

	if ((fspset->fsps_list_pool = uu_list_pool_create("fsps_list_pool",
	sizeof (fs_perm_node_t), offsetof(fs_perm_node_t, fspn_list_node),
	NULL, UU_DEFAULT)) == NULL)
	nomem();
	if ((fspset->fsps_list = uu_list_create(fspset->fsps_list_pool, NULL,
	UU_DEFAULT)) == NULL)
	nomem();

	if ((fspset->fsps_named_set_avl_pool = uu_avl_pool_create(
	"named_set_avl_pool", sizeof (who_perm_node_t), offsetof(
	who_perm_node_t, who_avl_node), who_perm_compare,
	UU_DEFAULT)) == NULL)
	nomem();

	if ((fspset->fsps_who_perm_avl_pool = uu_avl_pool_create(
	"who_perm_avl_pool", sizeof (who_perm_node_t), offsetof(
	who_perm_node_t, who_avl_node), who_perm_compare,
	UU_DEFAULT)) == NULL)
	nomem();

	if ((fspset->fsps_deleg_perm_avl_pool = uu_avl_pool_create(
	"deleg_perm_avl_pool", sizeof (deleg_perm_node_t), offsetof(
	deleg_perm_node_t, dpn_avl_node), deleg_perm_compare, UU_DEFAULT))
	== NULL)
	nomem();
	}

	static inline void fs_perm_fini(fs_perm_t *);
	static inline void who_perm_fini(who_perm_t *);

	static inline void
	fs_perm_set_fini(fs_perm_set_t *fspset)
	{
	fs_perm_node_t *node = uu_list_first(fspset->fsps_list);

	while (node != NULL) {
	fs_perm_node_t *next_node =
	uu_list_next(fspset->fsps_list, node);
	fs_perm_t *fsperm = &node->fspn_fsperm;
	fs_perm_fini(fsperm);
	uu_list_remove(fspset->fsps_list, node);
	free(node);
	node = next_node;
	}

	uu_avl_pool_destroy(fspset->fsps_named_set_avl_pool);
	uu_avl_pool_destroy(fspset->fsps_who_perm_avl_pool);
	uu_avl_pool_destroy(fspset->fsps_deleg_perm_avl_pool);
	}

	static inline void
	deleg_perm_init(deleg_perm_t *deleg_perm, zfs_deleg_who_type_t type,
	const char *name)
	{
	deleg_perm->dp_who_type = type;
	deleg_perm->dp_name = name;
	}

	static inline void
	who_perm_init(who_perm_t who_perm, fs_perm_t fsperm,
	zfs_deleg_who_type_t type, const char *name)
	{
	uu_avl_pool_t *pool;
	pool = fsperm->fsp_set->fsps_deleg_perm_avl_pool;

	bzero(who_perm, sizeof (who_perm_t));

	if ((who_perm->who_deleg_perm_avl = uu_avl_create(pool, NULL,
	UU_DEFAULT)) == NULL)
	nomem();

	who_perm->who_type = type;
	who_perm->who_name = name;
	who_perm->who_fsperm = fsperm;
	}

	static inline void
	who_perm_fini(who_perm_t *who_perm)
	{
	deleg_perm_node_t *node = uu_avl_first(who_perm->who_deleg_perm_avl);

	while (node != NULL) {
	deleg_perm_node_t *next_node =
	uu_avl_next(who_perm->who_deleg_perm_avl, node);

	uu_avl_remove(who_perm->who_deleg_perm_avl, node);
	free(node);
	node = next_node;
	}

	uu_avl_destroy(who_perm->who_deleg_perm_avl);
	}

	static inline void
	fs_perm_init(fs_perm_t fsperm, fs_perm_set_t fspset, const char *fsname)
	{
	uu_avl_pool_t *nset_pool = fspset->fsps_named_set_avl_pool;
	uu_avl_pool_t *who_pool = fspset->fsps_who_perm_avl_pool;

	bzero(fsperm, sizeof (fs_perm_t));

	if ((fsperm->fsp_sc_avl = uu_avl_create(nset_pool, NULL, UU_DEFAULT))
	== NULL)
	nomem();

	if ((fsperm->fsp_uge_avl = uu_avl_create(who_pool, NULL, UU_DEFAULT))
	== NULL)
	nomem();

	fsperm->fsp_set = fspset;
	fsperm->fsp_name = fsname;
	}

	static inline void
	fs_perm_fini(fs_perm_t *fsperm)
	{
	who_perm_node_t *node = uu_avl_first(fsperm->fsp_sc_avl);
	while (node != NULL) {
	who_perm_node_t *next_node = uu_avl_next(fsperm->fsp_sc_avl,
	node);
	who_perm_t *who_perm = &node->who_perm;
	who_perm_fini(who_perm);
	uu_avl_remove(fsperm->fsp_sc_avl, node);
	free(node);
	node = next_node;
	}

	node = uu_avl_first(fsperm->fsp_uge_avl);
	while (node != NULL) {
	who_perm_node_t *next_node = uu_avl_next(fsperm->fsp_uge_avl,
	node);
	who_perm_t *who_perm = &node->who_perm;
	who_perm_fini(who_perm);
	uu_avl_remove(fsperm->fsp_uge_avl, node);
	free(node);
	node = next_node;
	}

	uu_avl_destroy(fsperm->fsp_sc_avl);
	uu_avl_destroy(fsperm->fsp_uge_avl);
	}

	static void
	set_deleg_perm_node(uu_avl_t avl, deleg_perm_node_t node,
	zfs_deleg_who_type_t who_type, const char *name, char locality)
	{
	uu_avl_index_t idx = 0;

	deleg_perm_node_t *found_node = NULL;
	deleg_perm_t *deleg_perm = &node->dpn_perm;

	deleg_perm_init(deleg_perm, who_type, name);

	if ((found_node = uu_avl_find(avl, node, NULL, &idx))
	== NULL)
	uu_avl_insert(avl, node, idx);
	else {
	node = found_node;
	deleg_perm = &node->dpn_perm;
	}


	switch (locality) {
	case ZFS_DELEG_LOCAL:
	deleg_perm->dp_local = B_TRUE;
	break;
	case ZFS_DELEG_DESCENDENT:
	deleg_perm->dp_descend = B_TRUE;
	break;
	case ZFS_DELEG_NA:
	break;
	default:
	assert(B_FALSE); /* invalid locality */
	}
	}

	static inline int
	parse_who_perm(who_perm_t who_perm, nvlist_t nvl, char locality)
	{
	nvpair_t *nvp = NULL;
	fs_perm_set_t *fspset = who_perm->who_fsperm->fsp_set;
	uu_avl_t *avl = who_perm->who_deleg_perm_avl;
	zfs_deleg_who_type_t who_type = who_perm->who_type;

	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
	const char *name = nvpair_name(nvp);
	data_type_t type = nvpair_type(nvp);
	uu_avl_pool_t *avl_pool = fspset->fsps_deleg_perm_avl_pool;
	deleg_perm_node_t *node =
	safe_malloc(sizeof (deleg_perm_node_t));

	VERIFY(type == DATA_TYPE_BOOLEAN);

	uu_avl_node_init(node, &node->dpn_avl_node, avl_pool);
	set_deleg_perm_node(avl, node, who_type, name, locality);
	}

	return (0);
	}

	static inline int
	parse_fs_perm(fs_perm_t fsperm, nvlist_t nvl)
	{
	nvpair_t *nvp = NULL;
	fs_perm_set_t *fspset = fsperm->fsp_set;

	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
	nvlist_t *nvl2 = NULL;
	const char *name = nvpair_name(nvp);
	uu_avl_t *avl = NULL;
	uu_avl_pool_t *avl_pool = NULL;
	zfs_deleg_who_type_t perm_type = name[0];
	char perm_locality = name[1];
	const char *perm_name = name + 3;
	who_perm_t *who_perm = NULL;

	assert('$' == name[2]);

	if (nvpair_value_nvlist(nvp, &nvl2) != 0)
	return (-1);

	switch (perm_type) {
	case ZFS_DELEG_CREATE:
	case ZFS_DELEG_CREATE_SETS:
	case ZFS_DELEG_NAMED_SET:
	case ZFS_DELEG_NAMED_SET_SETS:
	avl_pool = fspset->fsps_named_set_avl_pool;
	avl = fsperm->fsp_sc_avl;
	break;
	case ZFS_DELEG_USER:
	case ZFS_DELEG_USER_SETS:
	case ZFS_DELEG_GROUP:
	case ZFS_DELEG_GROUP_SETS:
	case ZFS_DELEG_EVERYONE:
	case ZFS_DELEG_EVERYONE_SETS:
	avl_pool = fspset->fsps_who_perm_avl_pool;
	avl = fsperm->fsp_uge_avl;
	break;

	default:
	assert(!"unhandled zfs_deleg_who_type_t");
	}

	who_perm_node_t *found_node = NULL;
	who_perm_node_t *node = safe_malloc(
	sizeof (who_perm_node_t));
	who_perm = &node->who_perm;
	uu_avl_index_t idx = 0;

	uu_avl_node_init(node, &node->who_avl_node, avl_pool);
	who_perm_init(who_perm, fsperm, perm_type, perm_name);

	if ((found_node = uu_avl_find(avl, node, NULL, &idx))
	== NULL) {
	if (avl == fsperm->fsp_uge_avl) {
	uid_t rid = 0;
	struct passwd *p = NULL;
	struct group *g = NULL;
	const char *nice_name = NULL;

	switch (perm_type) {
	case ZFS_DELEG_USER_SETS:
	case ZFS_DELEG_USER:
	rid = atoi(perm_name);
	p = getpwuid(rid);
	if (p)
	nice_name = p->pw_name;
	break;
	case ZFS_DELEG_GROUP_SETS:
	case ZFS_DELEG_GROUP:
	rid = atoi(perm_name);
	g = getgrgid(rid);
	if (g)
	nice_name = g->gr_name;
	break;

	default:
	break;
	}

	if (nice_name != NULL) {
	(void) strlcpy(
	node->who_perm.who_ug_name,
	nice_name, 256);
	} else {
	/* User or group unknown */
	(void) snprintf(
	node->who_perm.who_ug_name,
	sizeof (node->who_perm.who_ug_name),
	"(unknown: %d)", rid);
	}
	}

	uu_avl_insert(avl, node, idx);
	} else {
	node = found_node;
	who_perm = &node->who_perm;
	}

	assert(who_perm != NULL);
	(void) parse_who_perm(who_perm, nvl2, perm_locality);
	}

	return (0);
	}

	static inline int
	parse_fs_perm_set(fs_perm_set_t fspset, nvlist_t nvl)
	{
	nvpair_t *nvp = NULL;
	uu_avl_index_t idx = 0;

	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
	nvlist_t *nvl2 = NULL;
	const char *fsname = nvpair_name(nvp);
	data_type_t type = nvpair_type(nvp);
	fs_perm_t *fsperm = NULL;
	fs_perm_node_t *node = safe_malloc(sizeof (fs_perm_node_t));
	if (node == NULL)
	nomem();

	fsperm = &node->fspn_fsperm;

	VERIFY(DATA_TYPE_NVLIST == type);

	uu_list_node_init(node, &node->fspn_list_node,
	fspset->fsps_list_pool);

	idx = uu_list_numnodes(fspset->fsps_list);
	fs_perm_init(fsperm, fspset, fsname);

	if (nvpair_value_nvlist(nvp, &nvl2) != 0)
	return (-1);

	(void) parse_fs_perm(fsperm, nvl2);

	uu_list_insert(fspset->fsps_list, node, idx);
	}

	return (0);
	}

	static inline const char *
	deleg_perm_comment(zfs_deleg_note_t note)
	{
	const char *str = "";

	/* subcommands */
	switch (note) {
	/* SUBCOMMANDS */
	case ZFS_DELEG_NOTE_ALLOW:
	str = gettext("Must also have the permission that is being"
	"\n\t\t\t\tallowed");
	break;
	case ZFS_DELEG_NOTE_CLONE:
	str = gettext("Must also have the 'create' ability and 'mount'"
	"\n\t\t\t\tability in the origin file system");
	break;
	case ZFS_DELEG_NOTE_CREATE:
	str = gettext("Must also have the 'mount' ability");
	break;
	case ZFS_DELEG_NOTE_DESTROY:
	str = gettext("Must also have the 'mount' ability");
	break;
	case ZFS_DELEG_NOTE_DIFF:
	str = gettext("Allows lookup of paths within a dataset;"
	"\n\t\t\t\tgiven an object number. Ordinary users need this"
	"\n\t\t\t\tin order to use zfs diff");
	break;
	case ZFS_DELEG_NOTE_HOLD:
	str = gettext("Allows adding a user hold to a snapshot");
	break;
	case ZFS_DELEG_NOTE_MOUNT:
	str = gettext("Allows mount/umount of ZFS datasets");
	break;
	case ZFS_DELEG_NOTE_PROMOTE:
	str = gettext("Must also have the 'mount'\n\t\t\t\tand"
	" 'promote' ability in the origin file system");
	break;
	case ZFS_DELEG_NOTE_RECEIVE:
	str = gettext("Must also have the 'mount' and 'create'"
	" ability");
	break;
	case ZFS_DELEG_NOTE_RELEASE:
	str = gettext("Allows releasing a user hold which\n\t\t\t\t"
	"might destroy the snapshot");
	break;
	case ZFS_DELEG_NOTE_RENAME:
	str = gettext("Must also have the 'mount' and 'create'"
	"\n\t\t\t\tability in the new parent");
	break;
	case ZFS_DELEG_NOTE_ROLLBACK:
	str = gettext("");
	break;
	case ZFS_DELEG_NOTE_SEND:
	str = gettext("");
	break;
	case ZFS_DELEG_NOTE_SHARE:
	str = gettext("Allows sharing file systems over NFS or SMB"
	"\n\t\t\t\tprotocols");
	break;
	case ZFS_DELEG_NOTE_SNAPSHOT:
	str = gettext("");
	break;
	case ZFS_DELEG_NOTE_LOAD_KEY:
	str = gettext("Allows loading or unloading an encryption key");
	break;
	case ZFS_DELEG_NOTE_CHANGE_KEY:
	str = gettext("Allows changing or adding an encryption key");
	break;
	/*
	* case ZFS_DELEG_NOTE_VSCAN:
	* str = gettext("");
	* break;
	*/
	/* OTHER */
	case ZFS_DELEG_NOTE_GROUPQUOTA:
	str = gettext("Allows accessing any groupquota@... property");
	break;
	case ZFS_DELEG_NOTE_GROUPUSED:
	str = gettext("Allows reading any groupused@... property");
	break;
	case ZFS_DELEG_NOTE_USERPROP:
	str = gettext("Allows changing any user property");
	break;
	case ZFS_DELEG_NOTE_USERQUOTA:
	str = gettext("Allows accessing any userquota@... property");
	break;
	case ZFS_DELEG_NOTE_USERUSED:
	str = gettext("Allows reading any userused@... property");
	break;
	case ZFS_DELEG_NOTE_USEROBJQUOTA:
	str = gettext("Allows accessing any userobjquota@... property");
	break;
	case ZFS_DELEG_NOTE_GROUPOBJQUOTA:
	str = gettext("Allows accessing any \n\t\t\t\t"
	"groupobjquota@... property");
	break;
	case ZFS_DELEG_NOTE_GROUPOBJUSED:
	str = gettext("Allows reading any groupobjused@... property");
	break;
	case ZFS_DELEG_NOTE_USEROBJUSED:
	str = gettext("Allows reading any userobjused@... property");
	break;
	case ZFS_DELEG_NOTE_PROJECTQUOTA:
	str = gettext("Allows accessing any projectquota@... property");
	break;
	case ZFS_DELEG_NOTE_PROJECTOBJQUOTA:
	str = gettext("Allows accessing any \n\t\t\t\t"
	"projectobjquota@... property");
	break;
	case ZFS_DELEG_NOTE_PROJECTUSED:
	str = gettext("Allows reading any projectused@... property");
	break;
	case ZFS_DELEG_NOTE_PROJECTOBJUSED:
	str = gettext("Allows accessing any \n\t\t\t\t"
	"projectobjused@... property");
	break;
	/* other */
	default:
	str = "";
	}

	return (str);
	}

	struct allow_opts {
	boolean_t local;
	boolean_t descend;
	boolean_t user;
	boolean_t group;
	boolean_t everyone;
	boolean_t create;
	boolean_t set;
	boolean_t recursive; /* unallow only */
	boolean_t prt_usage;

	boolean_t prt_perms;
	char *who;
	char *perms;
	const char *dataset;
	};

	static inline int
	prop_cmp(const void a, const void b)
	{
	const char str1 = (const char **)a;
	const char str2 = (const char **)b;
	return (strcmp(str1, str2));
	}

	static void
	allow_usage(boolean_t un, boolean_t requested, const char *msg)
	{
	const char *opt_desc[] = {
	"-h", gettext("show this help message and exit"),
	"-l", gettext("set permission locally"),
	"-d", gettext("set permission for descents"),
	"-u", gettext("set permission for user"),
	"-g", gettext("set permission for group"),
	"-e", gettext("set permission for everyone"),
	"-c", gettext("set create time permission"),
	"-s", gettext("define permission set"),
	/* unallow only */
	"-r", gettext("remove permissions recursively"),
	};
	size_t unallow_size = sizeof (opt_desc) / sizeof (char *);
	size_t allow_size = unallow_size - 2;
	const char *props[ZFS_NUM_PROPS];
	int i;
	size_t count = 0;
	FILE *fp = requested ? stdout : stderr;
	zprop_desc_t *pdtbl = zfs_prop_get_table();
	const char *fmt = gettext("%-16s %-14s\t%s\n");

	(void) fprintf(fp, gettext("Usage: %s\n"), get_usage(un ? HELP_UNALLOW :
	HELP_ALLOW));
	(void) fprintf(fp, gettext("Options:\n"));
	for (i = 0; i < (un ? unallow_size : allow_size); i += 2) {
	const char *opt = opt_desc[i];
	const char *optdsc = opt_desc[i + 1];
	(void) fprintf(fp, gettext(" %-10s %s\n"), opt, optdsc);
	}

	(void) fprintf(fp, gettext("\nThe following permissions are "
	"supported:\n\n"));
	(void) fprintf(fp, fmt, gettext("NAME"), gettext("TYPE"),
	gettext("NOTES"));
	for (i = 0; i < ZFS_NUM_DELEG_NOTES; i++) {
	const char *perm_name = zfs_deleg_perm_tbl[i].z_perm;
	zfs_deleg_note_t perm_note = zfs_deleg_perm_tbl[i].z_note;
	const char *perm_type = deleg_perm_type(perm_note);
	const char *perm_comment = deleg_perm_comment(perm_note);
	(void) fprintf(fp, fmt, perm_name, perm_type, perm_comment);
	}

	for (i = 0; i < ZFS_NUM_PROPS; i++) {
	zprop_desc_t *pd = &pdtbl[i];
	if (pd->pd_visible != B_TRUE)
	continue;

	if (pd->pd_attr == PROP_READONLY)
	continue;

	props[count++] = pd->pd_name;
	}
	props[count] = NULL;

	qsort(props, count, sizeof (char *), prop_cmp);

	for (i = 0; i < count; i++)
	(void) fprintf(fp, fmt, props[i], gettext("property"), "");

	if (msg != NULL)
	(void) fprintf(fp, gettext("\nzfs: error: %s"), msg);

	exit(requested ? 0 : 2);
	}

	static inline const char *
	munge_args(int argc, char **argv, boolean_t un, size_t expected_argc,
	char **permsp)
	{
	if (un && argc == expected_argc - 1)
	*permsp = NULL;
	else if (argc == expected_argc)
	*permsp = argv[argc - 2];
	else
	allow_usage(un, B_FALSE,
	gettext("wrong number of parameters\n"));

	return (argv[argc - 1]);
	}

	static void
	parse_allow_args(int argc, char *argv, boolean_t un, struct allow_opts opts)
	{
	int uge_sum = opts->user + opts->group + opts->everyone;
	int csuge_sum = opts->create + opts->set + uge_sum;
	int ldcsuge_sum = csuge_sum + opts->local + opts->descend;
	int all_sum = un ? ldcsuge_sum + opts->recursive : ldcsuge_sum;

	if (uge_sum > 1)
	allow_usage(un, B_FALSE,
	gettext("-u, -g, and -e are mutually exclusive\n"));

	if (opts->prt_usage) {
	if (argc == 0 && all_sum == 0)
	allow_usage(un, B_TRUE, NULL);
	else
	usage(B_FALSE);
	}

	if (opts->set) {
	if (csuge_sum > 1)
	allow_usage(un, B_FALSE,
	gettext("invalid options combined with -s\n"));

	opts->dataset = munge_args(argc, argv, un, 3, &opts->perms);
	if (argv[0][0] != '@')
	allow_usage(un, B_FALSE,
	gettext("invalid set name: missing '@' prefix\n"));
	opts->who = argv[0];
	} else if (opts->create) {
	if (ldcsuge_sum > 1)
	allow_usage(un, B_FALSE,
	gettext("invalid options combined with -c\n"));
	opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
	} else if (opts->everyone) {
	if (csuge_sum > 1)
	allow_usage(un, B_FALSE,
	gettext("invalid options combined with -e\n"));
	opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
	} else if (uge_sum == 0 && argc > 0 && strcmp(argv[0], "everyone")
	== 0) {
	opts->everyone = B_TRUE;
	argc--;
	argv++;
	opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
	} else if (argc == 1 && !un) {
	opts->prt_perms = B_TRUE;
	opts->dataset = argv[argc-1];
	} else {
	opts->dataset = munge_args(argc, argv, un, 3, &opts->perms);
	opts->who = argv[0];
	}

	if (!opts->local && !opts->descend) {
	opts->local = B_TRUE;
	opts->descend = B_TRUE;
	}
	}

	static void
	store_allow_perm(zfs_deleg_who_type_t type, boolean_t local, boolean_t descend,
	const char who, char perms, nvlist_t *top_nvl)
	{
	int i;
	char ld[2] = { '\0', '\0' };
	char who_buf[MAXNAMELEN + 32];
	char base_type = '\0';
	char set_type = '\0';
	nvlist_t *base_nvl = NULL;
	nvlist_t *set_nvl = NULL;
	nvlist_t *nvl;

	if (nvlist_alloc(&base_nvl, NV_UNIQUE_NAME, 0) != 0)
	nomem();
	if (nvlist_alloc(&set_nvl, NV_UNIQUE_NAME, 0) != 0)
	nomem();

	switch (type) {
	case ZFS_DELEG_NAMED_SET_SETS:
	case ZFS_DELEG_NAMED_SET:
	set_type = ZFS_DELEG_NAMED_SET_SETS;
	base_type = ZFS_DELEG_NAMED_SET;
	ld[0] = ZFS_DELEG_NA;
	break;
	case ZFS_DELEG_CREATE_SETS:
	case ZFS_DELEG_CREATE:
	set_type = ZFS_DELEG_CREATE_SETS;
	base_type = ZFS_DELEG_CREATE;
	ld[0] = ZFS_DELEG_NA;
	break;
	case ZFS_DELEG_USER_SETS:
	case ZFS_DELEG_USER:
	set_type = ZFS_DELEG_USER_SETS;
	base_type = ZFS_DELEG_USER;
	if (local)
	ld[0] = ZFS_DELEG_LOCAL;
	if (descend)
	ld[1] = ZFS_DELEG_DESCENDENT;
	break;
	case ZFS_DELEG_GROUP_SETS:
	case ZFS_DELEG_GROUP:
	set_type = ZFS_DELEG_GROUP_SETS;
	base_type = ZFS_DELEG_GROUP;
	if (local)
	ld[0] = ZFS_DELEG_LOCAL;
	if (descend)
	ld[1] = ZFS_DELEG_DESCENDENT;
	break;
	case ZFS_DELEG_EVERYONE_SETS:
	case ZFS_DELEG_EVERYONE:
	set_type = ZFS_DELEG_EVERYONE_SETS;
	base_type = ZFS_DELEG_EVERYONE;
	if (local)
	ld[0] = ZFS_DELEG_LOCAL;
	if (descend)
	ld[1] = ZFS_DELEG_DESCENDENT;
	break;

	default:
	assert(set_type != '\0' && base_type != '\0');
	}

	if (perms != NULL) {
	char *curr = perms;
	char *end = curr + strlen(perms);

	while (curr < end) {
	char *delim = strchr(curr, ',');
	if (delim == NULL)
	delim = end;
	else
	*delim = '\0';

	if (curr[0] == '@')
	nvl = set_nvl;
	else
	nvl = base_nvl;

	(void) nvlist_add_boolean(nvl, curr);
	if (delim != end)
	*delim = ',';
	curr = delim + 1;
	}

	for (i = 0; i < 2; i++) {
	char locality = ld[i];
	if (locality == 0)
	continue;

	if (!nvlist_empty(base_nvl)) {
	if (who != NULL)
	(void) snprintf(who_buf,
	sizeof (who_buf), "%c%c$%s",
	base_type, locality, who);
	else
	(void) snprintf(who_buf,
	sizeof (who_buf), "%c%c$",
	base_type, locality);

	(void) nvlist_add_nvlist(top_nvl, who_buf,
	base_nvl);
	}


	if (!nvlist_empty(set_nvl)) {
	if (who != NULL)
	(void) snprintf(who_buf,
	sizeof (who_buf), "%c%c$%s",
	set_type, locality, who);
	else
	(void) snprintf(who_buf,
	sizeof (who_buf), "%c%c$",
	set_type, locality);

	(void) nvlist_add_nvlist(top_nvl, who_buf,
	set_nvl);
	}
	}
	} else {
	for (i = 0; i < 2; i++) {
	char locality = ld[i];
	if (locality == 0)
	continue;

	if (who != NULL)
	(void) snprintf(who_buf, sizeof (who_buf),
	"%c%c$%s", base_type, locality, who);
	else
	(void) snprintf(who_buf, sizeof (who_buf),
	"%c%c$", base_type, locality);
	(void) nvlist_add_boolean(top_nvl, who_buf);

	if (who != NULL)
	(void) snprintf(who_buf, sizeof (who_buf),
	"%c%c$%s", set_type, locality, who);
	else
	(void) snprintf(who_buf, sizeof (who_buf),
	"%c%c$", set_type, locality);
	(void) nvlist_add_boolean(top_nvl, who_buf);
	}
	}
	}

	static int
	construct_fsacl_list(boolean_t un, struct allow_opts opts, nvlist_t *nvlp)
	{
	if (nvlist_alloc(nvlp, NV_UNIQUE_NAME, 0) != 0)
	nomem();

	if (opts->set) {
	store_allow_perm(ZFS_DELEG_NAMED_SET, opts->local,
	opts->descend, opts->who, opts->perms, *nvlp);
	} else if (opts->create) {
	store_allow_perm(ZFS_DELEG_CREATE, opts->local,
	opts->descend, NULL, opts->perms, *nvlp);
	} else if (opts->everyone) {
	store_allow_perm(ZFS_DELEG_EVERYONE, opts->local,
	opts->descend, NULL, opts->perms, *nvlp);
	} else {
	char *curr = opts->who;
	char *end = curr + strlen(curr);

	while (curr < end) {
	const char *who;
	zfs_deleg_who_type_t who_type = ZFS_DELEG_WHO_UNKNOWN;
	char *endch;
	char *delim = strchr(curr, ',');
	char errbuf[256];
	char id[64];
	struct passwd *p = NULL;
	struct group *g = NULL;

	uid_t rid;
	if (delim == NULL)
	delim = end;
	else
	*delim = '\0';

	rid = (uid_t)strtol(curr, &endch, 0);
	if (opts->user) {
	who_type = ZFS_DELEG_USER;
	if (*endch != '\0')
	p = getpwnam(curr);
	else
	p = getpwuid(rid);

	if (p != NULL)
	rid = p->pw_uid;
	else if (*endch != '\0') {
	(void) snprintf(errbuf, 256, gettext(
	"invalid user %s\n"), curr);
	allow_usage(un, B_TRUE, errbuf);
	}
	} else if (opts->group) {
	who_type = ZFS_DELEG_GROUP;
	if (*endch != '\0')
	g = getgrnam(curr);
	else
	g = getgrgid(rid);

	if (g != NULL)
	rid = g->gr_gid;
	else if (*endch != '\0') {
	(void) snprintf(errbuf, 256, gettext(
	"invalid group %s\n"), curr);
	allow_usage(un, B_TRUE, errbuf);
	}
	} else {
	if (*endch != '\0') {
	p = getpwnam(curr);
	} else {
	p = getpwuid(rid);
	}

	if (p == NULL) {
	if (*endch != '\0') {
	g = getgrnam(curr);
	} else {
	g = getgrgid(rid);
	}
	}

	if (p != NULL) {
	who_type = ZFS_DELEG_USER;
	rid = p->pw_uid;
	} else if (g != NULL) {
	who_type = ZFS_DELEG_GROUP;
	rid = g->gr_gid;
	} else {
	(void) snprintf(errbuf, 256, gettext(
	"invalid user/group %s\n"), curr);
	allow_usage(un, B_TRUE, errbuf);
	}
	}

	(void) sprintf(id, "%u", rid);
	who = id;

	store_allow_perm(who_type, opts->local,
	opts->descend, who, opts->perms, *nvlp);
	curr = delim + 1;
	}
	}

	return (0);
	}

	static void
	print_set_creat_perms(uu_avl_t *who_avl)
	{
	const char *sc_title[] = {
	gettext("Permission sets:\n"),
	gettext("Create time permissions:\n"),
	NULL
	};
	who_perm_node_t *who_node = NULL;
	int prev_weight = -1;

	for (who_node = uu_avl_first(who_avl); who_node != NULL;
	who_node = uu_avl_next(who_avl, who_node)) {
	uu_avl_t *avl = who_node->who_perm.who_deleg_perm_avl;
	zfs_deleg_who_type_t who_type = who_node->who_perm.who_type;
	const char *who_name = who_node->who_perm.who_name;
	int weight = who_type2weight(who_type);
	boolean_t first = B_TRUE;
	deleg_perm_node_t *deleg_node;

	if (prev_weight != weight) {
	(void) printf("%s", sc_title[weight]);
	prev_weight = weight;
	}

	if (who_name == NULL \|\| strnlen(who_name, 1) == 0)
	(void) printf("\t");
	else
	(void) printf("\t%s ", who_name);

	for (deleg_node = uu_avl_first(avl); deleg_node != NULL;
	deleg_node = uu_avl_next(avl, deleg_node)) {
	if (first) {
	(void) printf("%s",
	deleg_node->dpn_perm.dp_name);
	first = B_FALSE;
	} else
	(void) printf(",%s",
	deleg_node->dpn_perm.dp_name);
	}

	(void) printf("\n");
	}
	}

	static void
	print_uge_deleg_perms(uu_avl_t *who_avl, boolean_t local, boolean_t descend,
	const char *title)
	{
	who_perm_node_t *who_node = NULL;
	boolean_t prt_title = B_TRUE;
	uu_avl_walk_t *walk;

	if ((walk = uu_avl_walk_start(who_avl, UU_WALK_ROBUST)) == NULL)
	nomem();

	while ((who_node = uu_avl_walk_next(walk)) != NULL) {
	const char *who_name = who_node->who_perm.who_name;
	const char *nice_who_name = who_node->who_perm.who_ug_name;
	uu_avl_t *avl = who_node->who_perm.who_deleg_perm_avl;
	zfs_deleg_who_type_t who_type = who_node->who_perm.who_type;
	char delim = ' ';
	deleg_perm_node_t *deleg_node;
	boolean_t prt_who = B_TRUE;

	for (deleg_node = uu_avl_first(avl);
	deleg_node != NULL;
	deleg_node = uu_avl_next(avl, deleg_node)) {
	if (local != deleg_node->dpn_perm.dp_local \|\|
	descend != deleg_node->dpn_perm.dp_descend)
	continue;

	if (prt_who) {
	const char *who = NULL;
	if (prt_title) {
	prt_title = B_FALSE;
	(void) printf("%s", title);
	}

	switch (who_type) {
	case ZFS_DELEG_USER_SETS:
	case ZFS_DELEG_USER:
	who = gettext("user");
	if (nice_who_name)
	who_name = nice_who_name;
	break;
	case ZFS_DELEG_GROUP_SETS:
	case ZFS_DELEG_GROUP:
	who = gettext("group");
	if (nice_who_name)
	who_name = nice_who_name;
	break;
	case ZFS_DELEG_EVERYONE_SETS:
	case ZFS_DELEG_EVERYONE:
	who = gettext("everyone");
	who_name = NULL;
	break;

	default:
	assert(who != NULL);
	}

	prt_who = B_FALSE;
	if (who_name == NULL)
	(void) printf("\t%s", who);
	else
	(void) printf("\t%s %s", who, who_name);
	}

	(void) printf("%c%s", delim,
	deleg_node->dpn_perm.dp_name);
	delim = ',';
	}

	if (!prt_who)
	(void) printf("\n");
	}

	uu_avl_walk_end(walk);
	}

	static void
	print_fs_perms(fs_perm_set_t *fspset)
	{
	fs_perm_node_t *node = NULL;
	char buf[MAXNAMELEN + 32];
	const char *dsname = buf;

	for (node = uu_list_first(fspset->fsps_list); node != NULL;
	node = uu_list_next(fspset->fsps_list, node)) {
	uu_avl_t *sc_avl = node->fspn_fsperm.fsp_sc_avl;
	uu_avl_t *uge_avl = node->fspn_fsperm.fsp_uge_avl;
	int left = 0;

	(void) snprintf(buf, sizeof (buf),
	gettext("---- Permissions on %s "),
	node->fspn_fsperm.fsp_name);
	(void) printf("%s", dsname);
	left = 70 - strlen(buf);
	while (left-- > 0)
	(void) printf("-");
	(void) printf("\n");

	print_set_creat_perms(sc_avl);
	print_uge_deleg_perms(uge_avl, B_TRUE, B_FALSE,
	gettext("Local permissions:\n"));
	print_uge_deleg_perms(uge_avl, B_FALSE, B_TRUE,
	gettext("Descendent permissions:\n"));
	print_uge_deleg_perms(uge_avl, B_TRUE, B_TRUE,
	gettext("Local+Descendent permissions:\n"));
	}
	}

	static fs_perm_set_t fs_perm_set = { NULL, NULL, NULL, NULL };

	struct deleg_perms {
	boolean_t un;
	nvlist_t *nvl;
	};

	static int
	set_deleg_perms(zfs_handle_t zhp, void data)
	{
	struct deleg_perms perms = (struct deleg_perms )data;
	zfs_type_t zfs_type = zfs_get_type(zhp);

	if (zfs_type != ZFS_TYPE_FILESYSTEM && zfs_type != ZFS_TYPE_VOLUME)
	return (0);

	return (zfs_set_fsacl(zhp, perms->un, perms->nvl));
	}

	static int
	zfs_do_allow_unallow_impl(int argc, char **argv, boolean_t un)
	{
	zfs_handle_t *zhp;
	nvlist_t *perm_nvl = NULL;
	nvlist_t *update_perm_nvl = NULL;
	int error = 1;
	int c;
	struct allow_opts opts = { 0 };

	const char *optstr = un ? "ldugecsrh" : "ldugecsh";

	/* check opts */
	while ((c = getopt(argc, argv, optstr)) != -1) {
	switch (c) {
	case 'l':
	opts.local = B_TRUE;
	break;
	case 'd':
	opts.descend = B_TRUE;
	break;
	case 'u':
	opts.user = B_TRUE;
	break;
	case 'g':
	opts.group = B_TRUE;
	break;
	case 'e':
	opts.everyone = B_TRUE;
	break;
	case 's':
	opts.set = B_TRUE;
	break;
	case 'c':
	opts.create = B_TRUE;
	break;
	case 'r':
	opts.recursive = B_TRUE;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case 'h':
	opts.prt_usage = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* check arguments */
	parse_allow_args(argc, argv, un, &opts);

	/* try to open the dataset */
	if ((zhp = zfs_open(g_zfs, opts.dataset, ZFS_TYPE_FILESYSTEM \|
	ZFS_TYPE_VOLUME)) == NULL) {
	(void) fprintf(stderr, "Failed to open dataset: %s\n",
	opts.dataset);
	return (-1);
	}

	if (zfs_get_fsacl(zhp, &perm_nvl) != 0)
	goto cleanup2;

	fs_perm_set_init(&fs_perm_set);
	if (parse_fs_perm_set(&fs_perm_set, perm_nvl) != 0) {
	(void) fprintf(stderr, "Failed to parse fsacl permissions\n");
	goto cleanup1;
	}

	if (opts.prt_perms)
	print_fs_perms(&fs_perm_set);
	else {
	(void) construct_fsacl_list(un, &opts, &update_perm_nvl);
	if (zfs_set_fsacl(zhp, un, update_perm_nvl) != 0)
	goto cleanup0;

	if (un && opts.recursive) {
	struct deleg_perms data = { un, update_perm_nvl };
	if (zfs_iter_filesystems(zhp, set_deleg_perms,
	&data) != 0)
	goto cleanup0;
	}
	}

	error = 0;

	cleanup0:
	nvlist_free(perm_nvl);
	nvlist_free(update_perm_nvl);
	cleanup1:
	fs_perm_set_fini(&fs_perm_set);
	cleanup2:
	zfs_close(zhp);

	return (error);
	}

	static int
	zfs_do_allow(int argc, char **argv)
	{
	return (zfs_do_allow_unallow_impl(argc, argv, B_FALSE));
	}

	static int
	zfs_do_unallow(int argc, char **argv)
	{
	return (zfs_do_allow_unallow_impl(argc, argv, B_TRUE));
	}

	static int
	zfs_do_hold_rele_impl(int argc, char **argv, boolean_t holding)
	{
	int errors = 0;
	int i;
	const char *tag;
	boolean_t recursive = B_FALSE;
	const char *opts = holding ? "rt" : "r";
	int c;

	/* check options */
	while ((c = getopt(argc, argv, opts)) != -1) {
	switch (c) {
	case 'r':
	recursive = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc < 2)
	usage(B_FALSE);

	tag = argv[0];
	--argc;
	++argv;

	if (holding && tag[0] == '.') {
	/* tags starting with '.' are reserved for libzfs */
	(void) fprintf(stderr, gettext("tag may not start with '.'\n"));
	usage(B_FALSE);
	}

	for (i = 0; i < argc; ++i) {
	zfs_handle_t *zhp;
	char parent[ZFS_MAX_DATASET_NAME_LEN];
	const char *delim;
	char *path = argv[i];

	delim = strchr(path, '@');
	if (delim == NULL) {
	(void) fprintf(stderr,
	gettext("'%s' is not a snapshot\n"), path);
	++errors;
	continue;
	}
	(void) strncpy(parent, path, delim - path);
	parent[delim - path] = '\0';

	zhp = zfs_open(g_zfs, parent,
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL) {
	++errors;
	continue;
	}
	if (holding) {
	if (zfs_hold(zhp, delim+1, tag, recursive, -1) != 0)
	++errors;
	} else {
	if (zfs_release(zhp, delim+1, tag, recursive) != 0)
	++errors;
	}
	zfs_close(zhp);
	}

	return (errors != 0);
	}

	/*
	* zfs hold [-r] [-t] <tag> <snap> ...
	*
	* -r Recursively hold
	*
	* Apply a user-hold with the given tag to the list of snapshots.
	*/
	static int
	zfs_do_hold(int argc, char **argv)
	{
	return (zfs_do_hold_rele_impl(argc, argv, B_TRUE));
	}

	/*
	* zfs release [-r] <tag> <snap> ...
	*
	* -r Recursively release
	*
	* Release a user-hold with the given tag from the list of snapshots.
	*/
	static int
	zfs_do_release(int argc, char **argv)
	{
	return (zfs_do_hold_rele_impl(argc, argv, B_FALSE));
	}

	typedef struct holds_cbdata {
	boolean_t cb_recursive;
	const char *cb_snapname;
	nvlist_t **cb_nvlp;
	size_t cb_max_namelen;
	size_t cb_max_taglen;
	} holds_cbdata_t;

	#define STRFTIME_FMT_STR "%a %b %e %H:%M %Y"
	#define DATETIME_BUF_LEN (32)
	/*
	*
	*/
	static void
	print_holds(boolean_t scripted, int nwidth, int tagwidth, nvlist_t *nvl)
	{
	int i;
	nvpair_t *nvp = NULL;
	char *hdr_cols[] = { "NAME", "TAG", "TIMESTAMP" };
	const char *col;

	if (!scripted) {
	for (i = 0; i < 3; i++) {
	col = gettext(hdr_cols[i]);
	if (i < 2)
	(void) printf("%-*s ", i ? tagwidth : nwidth,
	col);
	else
	(void) printf("%s\n", col);
	}
	}

	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
	char *zname = nvpair_name(nvp);
	nvlist_t *nvl2;
	nvpair_t *nvp2 = NULL;
	(void) nvpair_value_nvlist(nvp, &nvl2);
	while ((nvp2 = nvlist_next_nvpair(nvl2, nvp2)) != NULL) {
	char tsbuf[DATETIME_BUF_LEN];
	char *tagname = nvpair_name(nvp2);
	uint64_t val = 0;
	time_t time;
	struct tm t;

	(void) nvpair_value_uint64(nvp2, &val);
	time = (time_t)val;
	(void) localtime_r(&time, &t);
	(void) strftime(tsbuf, DATETIME_BUF_LEN,
	gettext(STRFTIME_FMT_STR), &t);

	if (scripted) {
	(void) printf("%s\t%s\t%s\n", zname,
	tagname, tsbuf);
	} else {
	(void) printf("%-s %-s %s\n", nwidth,
	zname, tagwidth, tagname, tsbuf);
	}
	}
	}
	}

	/*
	* Generic callback function to list a dataset or snapshot.
	*/
	static int
	holds_callback(zfs_handle_t zhp, void data)
	{
	holds_cbdata_t *cbp = data;
	nvlist_t top_nvl = cbp->cb_nvlp;
	nvlist_t *nvl = NULL;
	nvpair_t *nvp = NULL;
	const char *zname = zfs_get_name(zhp);
	size_t znamelen = strlen(zname);

	if (cbp->cb_recursive) {
	const char *snapname;
	char *delim = strchr(zname, '@');
	if (delim == NULL)
	return (0);

	snapname = delim + 1;
	if (strcmp(cbp->cb_snapname, snapname))
	return (0);
	}

	if (zfs_get_holds(zhp, &nvl) != 0)
	return (-1);

	if (znamelen > cbp->cb_max_namelen)
	cbp->cb_max_namelen = znamelen;

	while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
	const char *tag = nvpair_name(nvp);
	size_t taglen = strlen(tag);
	if (taglen > cbp->cb_max_taglen)
	cbp->cb_max_taglen = taglen;
	}

	return (nvlist_add_nvlist(top_nvl, zname, nvl));
	}

	/*
	* zfs holds [-rH] <snap> ...
	*
	* -r Lists holds that are set on the named snapshots recursively.
	* -H Scripted mode; elide headers and separate columns by tabs.
	*/
	static int
	zfs_do_holds(int argc, char **argv)
	{
	int errors = 0;
	int c;
	int i;
	boolean_t scripted = B_FALSE;
	boolean_t recursive = B_FALSE;
	const char *opts = "rH";
	nvlist_t *nvl;

	int types = ZFS_TYPE_SNAPSHOT;
	holds_cbdata_t cb = { 0 };

	int limit = 0;
	int ret = 0;
	int flags = 0;

	/* check options */
	while ((c = getopt(argc, argv, opts)) != -1) {
	switch (c) {
	case 'r':
	recursive = B_TRUE;
	break;
	case 'H':
	scripted = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	if (recursive) {
	types \|= ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME;
	flags \|= ZFS_ITER_RECURSE;
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc < 1)
	usage(B_FALSE);

	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
	nomem();

	for (i = 0; i < argc; ++i) {
	char *snapshot = argv[i];
	const char *delim;
	const char *snapname;

	delim = strchr(snapshot, '@');
	if (delim == NULL) {
	(void) fprintf(stderr,
	gettext("'%s' is not a snapshot\n"), snapshot);
	++errors;
	continue;
	}
	snapname = delim + 1;
	if (recursive)
	snapshot[delim - snapshot] = '\0';

	cb.cb_recursive = recursive;
	cb.cb_snapname = snapname;
	cb.cb_nvlp = &nvl;

	/*
	* 1. collect holds data, set format options
	*/
	ret = zfs_for_each(argc, argv, flags, types, NULL, NULL, limit,
	holds_callback, &cb);
	if (ret != 0)
	++errors;
	}

	/*
	* 2. print holds data
	*/
	print_holds(scripted, cb.cb_max_namelen, cb.cb_max_taglen, nvl);

	if (nvlist_empty(nvl))
	(void) fprintf(stderr, gettext("no datasets available\n"));

	nvlist_free(nvl);

	return (0 != errors);
	}

	#define CHECK_SPINNER 30
	#define SPINNER_TIME 3 /* seconds */
	#define MOUNT_TIME 1 /* seconds */

	typedef struct get_all_state {
	boolean_t ga_verbose;
	get_all_cb_t *ga_cbp;
	} get_all_state_t;

	static int
	get_one_dataset(zfs_handle_t zhp, void data)
	{
	static char *spin[] = { "-", "\\", "\|", "/" };
	static int spinval = 0;
	static int spincheck = 0;
	static time_t last_spin_time = (time_t)0;
	get_all_state_t *state = data;
	zfs_type_t type = zfs_get_type(zhp);

	if (state->ga_verbose) {
	if (--spincheck < 0) {
	time_t now = time(NULL);
	if (last_spin_time + SPINNER_TIME < now) {
	update_progress(spin[spinval++ % 4]);
	last_spin_time = now;
	}
	spincheck = CHECK_SPINNER;
	}
	}

	/*
	* Iterate over any nested datasets.
	*/
	if (zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
	zfs_close(zhp);
	return (1);
	}

	/*
	* Skip any datasets whose type does not match.
	*/
	if ((type & ZFS_TYPE_FILESYSTEM) == 0) {
	zfs_close(zhp);
	return (0);
	}
	libzfs_add_handle(state->ga_cbp, zhp);
	assert(state->ga_cbp->cb_used <= state->ga_cbp->cb_alloc);

	return (0);
	}

	static void
	get_all_datasets(get_all_cb_t *cbp, boolean_t verbose)
	{
	get_all_state_t state = {
	.ga_verbose = verbose,
	.ga_cbp = cbp
	};

	if (verbose)
	set_progress_header(gettext("Reading ZFS config"));
	(void) zfs_iter_root(g_zfs, get_one_dataset, &state);

	if (verbose)
	finish_progress(gettext("done."));
	}

	/*
	* Generic callback for sharing or mounting filesystems. Because the code is so
	* similar, we have a common function with an extra parameter to determine which
	* mode we are using.
	*/
	typedef enum { OP_SHARE, OP_MOUNT } share_mount_op_t;

	typedef struct share_mount_state {
	share_mount_op_t sm_op;
	boolean_t sm_verbose;
	int sm_flags;
	char *sm_options;
	char sm_proto; / only valid for OP_SHARE */
	pthread_mutex_t sm_lock; /* protects the remaining fields */
	uint_t sm_total; /* number of filesystems to process */
	uint_t sm_done; /* number of filesystems processed */
	int sm_status; /* -1 if any of the share/mount operations failed */
	} share_mount_state_t;

	/*
	* Share or mount a dataset.
	*/
	static int
	share_mount_one(zfs_handle_t zhp, int op, int flags, char protocol,
	boolean_t explicit, const char *options)
	{
	char mountpoint[ZFS_MAXPROPLEN];
	char shareopts[ZFS_MAXPROPLEN];
	char smbshareopts[ZFS_MAXPROPLEN];
	const char *cmdname = op == OP_SHARE ? "share" : "mount";
	struct mnttab mnt;
	uint64_t zoned, canmount;
	boolean_t shared_nfs, shared_smb;

	assert(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM);

	/*
	* Check to make sure we can mount/share this dataset. If we
	* are in the global zone and the filesystem is exported to a
	* local zone, or if we are in a local zone and the
	* filesystem is not exported, then it is an error.
	*/
	zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);

	if (zoned && getzoneid() == GLOBAL_ZONEID) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot %s '%s': "
	"dataset is exported to a local zone\n"), cmdname,
	zfs_get_name(zhp));
	return (1);

	} else if (!zoned && getzoneid() != GLOBAL_ZONEID) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot %s '%s': "
	"permission denied\n"), cmdname,
	zfs_get_name(zhp));
	return (1);
	}

	/*
	* Ignore any filesystems which don't apply to us. This
	* includes those with a legacy mountpoint, or those with
	* legacy share options.
	*/
	verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
	sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
	verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
	sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
	verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshareopts,
	sizeof (smbshareopts), NULL, NULL, 0, B_FALSE) == 0);

	if (op == OP_SHARE && strcmp(shareopts, "off") == 0 &&
	strcmp(smbshareopts, "off") == 0) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot share '%s': "
	"legacy share\n"), zfs_get_name(zhp));
	(void) fprintf(stderr, gettext("use exports(5) or "
	"smb.conf(5) to share this filesystem, or set "
	"the sharenfs or sharesmb property\n"));
	return (1);
	}

	/*
	* We cannot share or mount legacy filesystems. If the
	* shareopts is non-legacy but the mountpoint is legacy, we
	* treat it as a legacy share.
	*/
	if (strcmp(mountpoint, "legacy") == 0) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot %s '%s': "
	"legacy mountpoint\n"), cmdname, zfs_get_name(zhp));
	(void) fprintf(stderr, gettext("use %s(8) to "
	"%s this filesystem\n"), cmdname, cmdname);
	return (1);
	}

	if (strcmp(mountpoint, "none") == 0) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot %s '%s': no "
	"mountpoint set\n"), cmdname, zfs_get_name(zhp));
	return (1);
	}

	/*
	* canmount explicit outcome
	* on no pass through
	* on yes pass through
	* off no return 0
	* off yes display error, return 1
	* noauto no return 0
	* noauto yes pass through
	*/
	canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
	if (canmount == ZFS_CANMOUNT_OFF) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot %s '%s': "
	"'canmount' property is set to 'off'\n"), cmdname,
	zfs_get_name(zhp));
	return (1);
	} else if (canmount == ZFS_CANMOUNT_NOAUTO && !explicit) {
	/*
	* When performing a 'zfs mount -a', we skip any mounts for
	* datasets that have 'noauto' set. Sharing a dataset with
	* 'noauto' set is only allowed if it's mounted.
	*/
	if (op == OP_MOUNT)
	return (0);
	if (op == OP_SHARE && !zfs_is_mounted(zhp, NULL)) {
	/* also purge it from existing exports */
	zfs_unshareall_bypath(zhp, mountpoint);
	return (0);
	}
	}

	/*
	* If this filesystem is encrypted and does not have
	* a loaded key, we can not mount it.
	*/
	if ((flags & MS_CRYPT) == 0 &&
	zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF &&
	zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS) ==
	ZFS_KEYSTATUS_UNAVAILABLE) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot %s '%s': "
	"encryption key not loaded\n"), cmdname, zfs_get_name(zhp));
	return (1);
	}

	/*
	* If this filesystem is inconsistent and has a receive resume
	* token, we can not mount it.
	*/
	if (zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) &&
	zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
	NULL, 0, NULL, NULL, 0, B_TRUE) == 0) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot %s '%s': "
	"Contains partially-completed state from "
	"\"zfs receive -s\", which can be resumed with "
	"\"zfs send -t\"\n"),
	cmdname, zfs_get_name(zhp));
	return (1);
	}

	if (zfs_prop_get_int(zhp, ZFS_PROP_REDACTED) && !(flags & MS_FORCE)) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot %s '%s': "
	"Dataset is not complete, was created by receiving "
	"a redacted zfs send stream.\n"), cmdname,
	zfs_get_name(zhp));
	return (1);
	}

	/*
	* At this point, we have verified that the mountpoint and/or
	* shareopts are appropriate for auto management. If the
	* filesystem is already mounted or shared, return (failing
	* for explicit requests); otherwise mount or share the
	* filesystem.
	*/
	switch (op) {
	case OP_SHARE:

	shared_nfs = zfs_is_shared_nfs(zhp, NULL);
	shared_smb = zfs_is_shared_smb(zhp, NULL);

	if ((shared_nfs && shared_smb) \|\|
	(shared_nfs && strcmp(shareopts, "on") == 0 &&
	strcmp(smbshareopts, "off") == 0) \|\|
	(shared_smb && strcmp(smbshareopts, "on") == 0 &&
	strcmp(shareopts, "off") == 0)) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot share "
	"'%s': filesystem already shared\n"),
	zfs_get_name(zhp));
	return (1);
	}

	if (!zfs_is_mounted(zhp, NULL) &&
	zfs_mount(zhp, NULL, flags) != 0)
	return (1);

	if (protocol == NULL) {
	if (zfs_shareall(zhp) != 0)
	return (1);
	} else if (strcmp(protocol, "nfs") == 0) {
	if (zfs_share_nfs(zhp))
	return (1);
	} else if (strcmp(protocol, "smb") == 0) {
	if (zfs_share_smb(zhp))
	return (1);
	} else {
	(void) fprintf(stderr, gettext("cannot share "
	"'%s': invalid share type '%s' "
	"specified\n"),
	zfs_get_name(zhp), protocol);
	return (1);
	}

	break;

	case OP_MOUNT:
	if (options == NULL)
	mnt.mnt_mntopts = "";
	else
	mnt.mnt_mntopts = (char *)options;

	if (!hasmntopt(&mnt, MNTOPT_REMOUNT) &&
	zfs_is_mounted(zhp, NULL)) {
	if (!explicit)
	return (0);

	(void) fprintf(stderr, gettext("cannot mount "
	"'%s': filesystem already mounted\n"),
	zfs_get_name(zhp));
	return (1);
	}

	if (zfs_mount(zhp, options, flags) != 0)
	return (1);
	break;
	}

	return (0);
	}

	/*
	* Reports progress in the form "(current/total)". Not thread-safe.
	*/
	static void
	report_mount_progress(int current, int total)
	{
	static time_t last_progress_time = 0;
	time_t now = time(NULL);
	char info[32];

	/* display header if we're here for the first time */
	if (current == 1) {
	set_progress_header(gettext("Mounting ZFS filesystems"));
	} else if (current != total && last_progress_time + MOUNT_TIME >= now) {
	/* too soon to report again */
	return;
	}

	last_progress_time = now;

	(void) sprintf(info, "(%d/%d)", current, total);

	if (current == total)
	finish_progress(info);
	else
	update_progress(info);
	}

	/*
	* zfs_foreach_mountpoint() callback that mounts or shares one filesystem and
	* updates the progress meter.
	*/
	static int
	share_mount_one_cb(zfs_handle_t zhp, void arg)
	{
	share_mount_state_t *sms = arg;
	int ret;

	ret = share_mount_one(zhp, sms->sm_op, sms->sm_flags, sms->sm_proto,
	B_FALSE, sms->sm_options);

	pthread_mutex_lock(&sms->sm_lock);
	if (ret != 0)
	sms->sm_status = ret;
	sms->sm_done++;
	if (sms->sm_verbose)
	report_mount_progress(sms->sm_done, sms->sm_total);
	pthread_mutex_unlock(&sms->sm_lock);
	return (ret);
	}

	static void
	append_options(char mntopts, char newopts)
	{
	int len = strlen(mntopts);

	/* original length plus new string to append plus 1 for the comma */
	if (len + 1 + strlen(newopts) >= MNT_LINE_MAX) {
	(void) fprintf(stderr, gettext("the opts argument for "
	"'%s' option is too long (more than %d chars)\n"),
	"-o", MNT_LINE_MAX);
	usage(B_FALSE);
	}

	if (*mntopts)
	mntopts[len++] = ',';

	(void) strcpy(&mntopts[len], newopts);
	}

	static int
	share_mount(int op, int argc, char **argv)
	{
	int do_all = 0;
	boolean_t verbose = B_FALSE;
	int c, ret = 0;
	char *options = NULL;
	int flags = 0;

	/* check options */
	while ((c = getopt(argc, argv, op == OP_MOUNT ? ":alvo:Of" : "al"))
	!= -1) {
	switch (c) {
	case 'a':
	do_all = 1;
	break;
	case 'v':
	verbose = B_TRUE;
	break;
	case 'l':
	flags \|= MS_CRYPT;
	break;
	case 'o':
	if (*optarg == '\0') {
	(void) fprintf(stderr, gettext("empty mount "
	"options (-o) specified\n"));
	usage(B_FALSE);
	}

	if (options == NULL)
	options = safe_malloc(MNT_LINE_MAX + 1);

	/* option validation is done later */
	append_options(options, optarg);
	break;
	case 'O':
	flags \|= MS_OVERLAY;
	break;
	case 'f':
	flags \|= MS_FORCE;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (do_all) {
	char *protocol = NULL;

	if (op == OP_SHARE && argc > 0) {
	if (strcmp(argv[0], "nfs") != 0 &&
	strcmp(argv[0], "smb") != 0) {
	(void) fprintf(stderr, gettext("share type "
	"must be 'nfs' or 'smb'\n"));
	usage(B_FALSE);
	}
	protocol = argv[0];
	argc--;
	argv++;
	}

	if (argc != 0) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	start_progress_timer();
	get_all_cb_t cb = { 0 };
	get_all_datasets(&cb, verbose);

	if (cb.cb_used == 0) {
	if (options != NULL)
	free(options);
	return (0);
	}

	share_mount_state_t share_mount_state = { 0 };
	share_mount_state.sm_op = op;
	share_mount_state.sm_verbose = verbose;
	share_mount_state.sm_flags = flags;
	share_mount_state.sm_options = options;
	share_mount_state.sm_proto = protocol;
	share_mount_state.sm_total = cb.cb_used;
	pthread_mutex_init(&share_mount_state.sm_lock, NULL);

	/*
	* libshare isn't mt-safe, so only do the operation in parallel
	* if we're mounting. Additionally, the key-loading option must
	* be serialized so that we can prompt the user for their keys
	* in a consistent manner.
	*/
	zfs_foreach_mountpoint(g_zfs, cb.cb_handles, cb.cb_used,
	share_mount_one_cb, &share_mount_state,
	op == OP_MOUNT && !(flags & MS_CRYPT));
	zfs_commit_all_shares();

	ret = share_mount_state.sm_status;

	for (int i = 0; i < cb.cb_used; i++)
	zfs_close(cb.cb_handles[i]);
	free(cb.cb_handles);
	} else if (argc == 0) {
	struct mnttab entry;

	if ((op == OP_SHARE) \|\| (options != NULL)) {
	(void) fprintf(stderr, gettext("missing filesystem "
	"argument (specify -a for all)\n"));
	usage(B_FALSE);
	}

	/*
	* When mount is given no arguments, go through
	* /proc/self/mounts and display any active ZFS mounts.
	* We hide any snapshots, since they are controlled
	* automatically.
	*/

	/* Reopen MNTTAB to prevent reading stale data from open file */
	if (freopen(MNTTAB, "r", mnttab_file) == NULL) {
	if (options != NULL)
	free(options);
	return (ENOENT);
	}

	while (getmntent(mnttab_file, &entry) == 0) {
	if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 \|\|
	strchr(entry.mnt_special, '@') != NULL)
	continue;

	(void) printf("%-30s %s\n", entry.mnt_special,
	entry.mnt_mountp);
	}

	} else {
	zfs_handle_t *zhp;

	if (argc > 1) {
	(void) fprintf(stderr,
	gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	if ((zhp = zfs_open(g_zfs, argv[0],
	ZFS_TYPE_FILESYSTEM)) == NULL) {
	ret = 1;
	} else {
	ret = share_mount_one(zhp, op, flags, NULL, B_TRUE,
	options);
	zfs_commit_all_shares();
	zfs_close(zhp);
	}
	}

	if (options != NULL)
	free(options);

	return (ret);
	}

	/*
	* zfs mount -a [nfs]
	* zfs mount filesystem
	*
	* Mount all filesystems, or mount the given filesystem.
	*/
	static int
	zfs_do_mount(int argc, char **argv)
	{
	return (share_mount(OP_MOUNT, argc, argv));
	}

	/*
	* zfs share -a [nfs \| smb]
	* zfs share filesystem
	*
	* Share all filesystems, or share the given filesystem.
	*/
	static int
	zfs_do_share(int argc, char **argv)
	{
	return (share_mount(OP_SHARE, argc, argv));
	}

	typedef struct unshare_unmount_node {
	zfs_handle_t *un_zhp;
	char *un_mountp;
	uu_avl_node_t un_avlnode;
	} unshare_unmount_node_t;

	/* ARGSUSED */
	static int
	unshare_unmount_compare(const void larg, const void rarg, void *unused)
	{
	const unshare_unmount_node_t *l = larg;
	const unshare_unmount_node_t *r = rarg;

	return (strcmp(l->un_mountp, r->un_mountp));
	}

	/*
	* Convenience routine used by zfs_do_umount() and manual_unmount(). Given an
	* absolute path, find the entry /proc/self/mounts, verify that it's a
	* ZFS filesystem, and unmount it appropriately.
	*/
	static int
	unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
	{
	zfs_handle_t *zhp;
	int ret = 0;
	struct stat64 statbuf;
	struct extmnttab entry;
	const char *cmdname = (op == OP_SHARE) ? "unshare" : "unmount";
	ino_t path_inode;

	/*
	* Search for the given (major,minor) pair in the mount table.
	*/

	/* Reopen MNTTAB to prevent reading stale data from open file */
	if (freopen(MNTTAB, "r", mnttab_file) == NULL)
	return (ENOENT);

	if (getextmntent(path, &entry, &statbuf) != 0) {
	if (op == OP_SHARE) {
	(void) fprintf(stderr, gettext("cannot %s '%s': not "
	"currently mounted\n"), cmdname, path);
	return (1);
	}
	(void) fprintf(stderr, gettext("warning: %s not in"
	"/proc/self/mounts\n"), path);
	if ((ret = umount2(path, flags)) != 0)
	(void) fprintf(stderr, gettext("%s: %s\n"), path,
	strerror(errno));
	return (ret != 0);
	}
	path_inode = statbuf.st_ino;

	if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) {
	(void) fprintf(stderr, gettext("cannot %s '%s': not a ZFS "
	"filesystem\n"), cmdname, path);
	return (1);
	}

	if ((zhp = zfs_open(g_zfs, entry.mnt_special,
	ZFS_TYPE_FILESYSTEM)) == NULL)
	return (1);

	ret = 1;
	if (stat64(entry.mnt_mountp, &statbuf) != 0) {
	(void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
	cmdname, path, strerror(errno));
	goto out;
	} else if (statbuf.st_ino != path_inode) {
	(void) fprintf(stderr, gettext("cannot "
	"%s '%s': not a mountpoint\n"), cmdname, path);
	goto out;
	}

	if (op == OP_SHARE) {
	char nfs_mnt_prop[ZFS_MAXPROPLEN];
	char smbshare_prop[ZFS_MAXPROPLEN];

	verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, nfs_mnt_prop,
	sizeof (nfs_mnt_prop), NULL, NULL, 0, B_FALSE) == 0);
	verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshare_prop,
	sizeof (smbshare_prop), NULL, NULL, 0, B_FALSE) == 0);

	if (strcmp(nfs_mnt_prop, "off") == 0 &&
	strcmp(smbshare_prop, "off") == 0) {
	(void) fprintf(stderr, gettext("cannot unshare "
	"'%s': legacy share\n"), path);
	(void) fprintf(stderr, gettext("use exportfs(8) "
	"or smbcontrol(1) to unshare this filesystem\n"));
	} else if (!zfs_is_shared(zhp)) {
	(void) fprintf(stderr, gettext("cannot unshare '%s': "
	"not currently shared\n"), path);
	} else {
	ret = zfs_unshareall_bypath(zhp, path);
	zfs_commit_all_shares();
	}
	} else {
	char mtpt_prop[ZFS_MAXPROPLEN];

	verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mtpt_prop,
	sizeof (mtpt_prop), NULL, NULL, 0, B_FALSE) == 0);

	if (is_manual) {
	ret = zfs_unmount(zhp, NULL, flags);
	} else if (strcmp(mtpt_prop, "legacy") == 0) {
	(void) fprintf(stderr, gettext("cannot unmount "
	"'%s': legacy mountpoint\n"),
	zfs_get_name(zhp));
	(void) fprintf(stderr, gettext("use umount(8) "
	"to unmount this filesystem\n"));
	} else {
	ret = zfs_unmountall(zhp, flags);
	}
	}

	out:
	zfs_close(zhp);

	return (ret != 0);
	}

	/*
	* Generic callback for unsharing or unmounting a filesystem.
	*/
	static int
	unshare_unmount(int op, int argc, char **argv)
	{
	int do_all = 0;
	int flags = 0;
	int ret = 0;
	int c;
	zfs_handle_t *zhp;
	char nfs_mnt_prop[ZFS_MAXPROPLEN];
	char sharesmb[ZFS_MAXPROPLEN];

	/* check options */
	while ((c = getopt(argc, argv, op == OP_SHARE ? ":a" : "afu")) != -1) {
	switch (c) {
	case 'a':
	do_all = 1;
	break;
	case 'f':
	flags \|= MS_FORCE;
	break;
	case 'u':
	flags \|= MS_CRYPT;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (do_all) {
	/*
	* We could make use of zfs_for_each() to walk all datasets in
	* the system, but this would be very inefficient, especially
	* since we would have to linearly search /proc/self/mounts for
	* each one. Instead, do one pass through /proc/self/mounts
	* looking for zfs entries and call zfs_unmount() for each one.
	*
	* Things get a little tricky if the administrator has created
	* mountpoints beneath other ZFS filesystems. In this case, we
	* have to unmount the deepest filesystems first. To accomplish
	* this, we place all the mountpoints in an AVL tree sorted by
	* the special type (dataset name), and walk the result in
	* reverse to make sure to get any snapshots first.
	*/
	struct mnttab entry;
	uu_avl_pool_t *pool;
	uu_avl_t *tree = NULL;
	unshare_unmount_node_t *node;
	uu_avl_index_t idx;
	uu_avl_walk_t *walk;
	char *protocol = NULL;

	if (op == OP_SHARE && argc > 0) {
	if (strcmp(argv[0], "nfs") != 0 &&
	strcmp(argv[0], "smb") != 0) {
	(void) fprintf(stderr, gettext("share type "
	"must be 'nfs' or 'smb'\n"));
	usage(B_FALSE);
	}
	protocol = argv[0];
	argc--;
	argv++;
	}

	if (argc != 0) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	if (((pool = uu_avl_pool_create("unmount_pool",
	sizeof (unshare_unmount_node_t),
	offsetof(unshare_unmount_node_t, un_avlnode),
	unshare_unmount_compare, UU_DEFAULT)) == NULL) \|\|
	((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL))
	nomem();

	/* Reopen MNTTAB to prevent reading stale data from open file */
	if (freopen(MNTTAB, "r", mnttab_file) == NULL)
	return (ENOENT);

	while (getmntent(mnttab_file, &entry) == 0) {

	/* ignore non-ZFS entries */
	if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
	continue;

	/* ignore snapshots */
	if (strchr(entry.mnt_special, '@') != NULL)
	continue;

	if ((zhp = zfs_open(g_zfs, entry.mnt_special,
	ZFS_TYPE_FILESYSTEM)) == NULL) {
	ret = 1;
	continue;
	}

	/*
	* Ignore datasets that are excluded/restricted by
	* parent pool name.
	*/
	if (zpool_skip_pool(zfs_get_pool_name(zhp))) {
	zfs_close(zhp);
	continue;
	}

	switch (op) {
	case OP_SHARE:
	verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
	nfs_mnt_prop,
	sizeof (nfs_mnt_prop),
	NULL, NULL, 0, B_FALSE) == 0);
	if (strcmp(nfs_mnt_prop, "off") != 0)
	break;
	verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
	nfs_mnt_prop,
	sizeof (nfs_mnt_prop),
	NULL, NULL, 0, B_FALSE) == 0);
	if (strcmp(nfs_mnt_prop, "off") == 0)
	continue;
	break;
	case OP_MOUNT:
	/* Ignore legacy mounts */
	verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
	nfs_mnt_prop,
	sizeof (nfs_mnt_prop),
	NULL, NULL, 0, B_FALSE) == 0);
	if (strcmp(nfs_mnt_prop, "legacy") == 0)
	continue;
	/* Ignore canmount=noauto mounts */
	if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) ==
	ZFS_CANMOUNT_NOAUTO)
	continue;
	default:
	break;
	}

	node = safe_malloc(sizeof (unshare_unmount_node_t));
	node->un_zhp = zhp;
	node->un_mountp = safe_strdup(entry.mnt_mountp);

	uu_avl_node_init(node, &node->un_avlnode, pool);

	if (uu_avl_find(tree, node, NULL, &idx) == NULL) {
	uu_avl_insert(tree, node, idx);
	} else {
	zfs_close(node->un_zhp);
	free(node->un_mountp);
	free(node);
	}
	}

	/*
	* Walk the AVL tree in reverse, unmounting each filesystem and
	* removing it from the AVL tree in the process.
	*/
	if ((walk = uu_avl_walk_start(tree,
	UU_WALK_REVERSE \| UU_WALK_ROBUST)) == NULL)
	nomem();

	while ((node = uu_avl_walk_next(walk)) != NULL) {
	const char *mntarg = NULL;

	uu_avl_remove(tree, node);
	switch (op) {
	case OP_SHARE:
	if (zfs_unshareall_bytype(node->un_zhp,
	node->un_mountp, protocol) != 0)
	ret = 1;
	break;

	case OP_MOUNT:
	if (zfs_unmount(node->un_zhp,
	mntarg, flags) != 0)
	ret = 1;
	break;
	}

	zfs_close(node->un_zhp);
	free(node->un_mountp);
	free(node);
	}

	if (op == OP_SHARE)
	zfs_commit_shares(protocol);

	uu_avl_walk_end(walk);
	uu_avl_destroy(tree);
	uu_avl_pool_destroy(pool);

	} else {
	if (argc != 1) {
	if (argc == 0)
	(void) fprintf(stderr,
	gettext("missing filesystem argument\n"));
	else
	(void) fprintf(stderr,
	gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	/*
	* We have an argument, but it may be a full path or a ZFS
	* filesystem. Pass full paths off to unmount_path() (shared by
	* manual_unmount), otherwise open the filesystem and pass to
	* zfs_unmount().
	*/
	if (argv[0][0] == '/')
	return (unshare_unmount_path(op, argv[0],
	flags, B_FALSE));

	if ((zhp = zfs_open(g_zfs, argv[0],
	ZFS_TYPE_FILESYSTEM)) == NULL)
	return (1);

	verify(zfs_prop_get(zhp, op == OP_SHARE ?
	ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
	nfs_mnt_prop, sizeof (nfs_mnt_prop), NULL,
	NULL, 0, B_FALSE) == 0);

	switch (op) {
	case OP_SHARE:
	verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
	nfs_mnt_prop,
	sizeof (nfs_mnt_prop),
	NULL, NULL, 0, B_FALSE) == 0);
	verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
	sharesmb, sizeof (sharesmb), NULL, NULL,
	0, B_FALSE) == 0);

	if (strcmp(nfs_mnt_prop, "off") == 0 &&
	strcmp(sharesmb, "off") == 0) {
	(void) fprintf(stderr, gettext("cannot "
	"unshare '%s': legacy share\n"),
	zfs_get_name(zhp));
	(void) fprintf(stderr, gettext("use "
	"exports(5) or smb.conf(5) to unshare "
	"this filesystem\n"));
	ret = 1;
	} else if (!zfs_is_shared(zhp)) {
	(void) fprintf(stderr, gettext("cannot "
	"unshare '%s': not currently "
	"shared\n"), zfs_get_name(zhp));
	ret = 1;
	} else if (zfs_unshareall(zhp) != 0) {
	ret = 1;
	}
	break;

	case OP_MOUNT:
	if (strcmp(nfs_mnt_prop, "legacy") == 0) {
	(void) fprintf(stderr, gettext("cannot "
	"unmount '%s': legacy "
	"mountpoint\n"), zfs_get_name(zhp));
	(void) fprintf(stderr, gettext("use "
	"umount(8) to unmount this "
	"filesystem\n"));
	ret = 1;
	} else if (!zfs_is_mounted(zhp, NULL)) {
	(void) fprintf(stderr, gettext("cannot "
	"unmount '%s': not currently "
	"mounted\n"),
	zfs_get_name(zhp));
	ret = 1;
	} else if (zfs_unmountall(zhp, flags) != 0) {
	ret = 1;
	}
	break;
	}

	zfs_close(zhp);
	}

	return (ret);
	}

	/*
	* zfs unmount [-fu] -a
	* zfs unmount [-fu] filesystem
	*
	* Unmount all filesystems, or a specific ZFS filesystem.
	*/
	static int
	zfs_do_unmount(int argc, char **argv)
	{
	return (unshare_unmount(OP_MOUNT, argc, argv));
	}

	/*
	* zfs unshare -a
	* zfs unshare filesystem
	*
	* Unshare all filesystems, or a specific ZFS filesystem.
	*/
	static int
	zfs_do_unshare(int argc, char **argv)
	{
	return (unshare_unmount(OP_SHARE, argc, argv));
	}

	static int
	find_command_idx(char command, int idx)
	{
	int i;

	for (i = 0; i < NCOMMAND; i++) {
	if (command_table[i].name == NULL)
	continue;

	if (strcmp(command, command_table[i].name) == 0) {
	*idx = i;
	return (0);
	}
	}
	return (1);
	}

	static int
	zfs_do_diff(int argc, char **argv)
	{
	zfs_handle_t *zhp;
	int flags = 0;
	char *tosnap = NULL;
	char *fromsnap = NULL;
	char atp, copy;
	int err = 0;
	int c;
	struct sigaction sa;

	while ((c = getopt(argc, argv, "FHt")) != -1) {
	switch (c) {
	case 'F':
	flags \|= ZFS_DIFF_CLASSIFY;
	break;
	case 'H':
	flags \|= ZFS_DIFF_PARSEABLE;
	break;
	case 't':
	flags \|= ZFS_DIFF_TIMESTAMP;
	break;
	default:
	(void) fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr,
	gettext("must provide at least one snapshot name\n"));
	usage(B_FALSE);
	}

	if (argc > 2) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	fromsnap = argv[0];
	tosnap = (argc == 2) ? argv[1] : NULL;

	copy = NULL;
	if (*fromsnap != '@')
	copy = strdup(fromsnap);
	else if (tosnap)
	copy = strdup(tosnap);
	if (copy == NULL)
	usage(B_FALSE);

	if ((atp = strchr(copy, '@')) != NULL)
	*atp = '\0';

	if ((zhp = zfs_open(g_zfs, copy, ZFS_TYPE_FILESYSTEM)) == NULL) {
	free(copy);
	return (1);
	}
	free(copy);

	/*
	* Ignore SIGPIPE so that the library can give us
	* information on any failure
	*/
	if (sigemptyset(&sa.sa_mask) == -1) {
	err = errno;
	goto out;
	}
	sa.sa_flags = 0;
	sa.sa_handler = SIG_IGN;
	if (sigaction(SIGPIPE, &sa, NULL) == -1) {
	err = errno;
	goto out;
	}

	err = zfs_show_diffs(zhp, STDOUT_FILENO, fromsnap, tosnap, flags);
	out:
	zfs_close(zhp);

	return (err != 0);
	}

	/*
	* zfs bookmark <fs@source>\|<fs#source> <fs#bookmark>
	*
	* Creates a bookmark with the given name from the source snapshot
	* or creates a copy of an existing source bookmark.
	*/
	static int
	zfs_do_bookmark(int argc, char **argv)
	{
	char source, bookname;
	char expbuf[ZFS_MAX_DATASET_NAME_LEN];
	int source_type;
	nvlist_t *nvl;
	int ret = 0;
	int c;

	/* check options */
	while ((c = getopt(argc, argv, "")) != -1) {
	switch (c) {
	case '?':
	(void) fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	goto usage;
	}
	}

	argc -= optind;
	argv += optind;

	/* check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing source argument\n"));
	goto usage;
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing bookmark argument\n"));
	goto usage;
	}

	source = argv[0];
	bookname = argv[1];

	if (strchr(source, '@') == NULL && strchr(source, '#') == NULL) {
	(void) fprintf(stderr,
	gettext("invalid source name '%s': "
	"must contain a '@' or '#'\n"), source);
	goto usage;
	}
	if (strchr(bookname, '#') == NULL) {
	(void) fprintf(stderr,
	gettext("invalid bookmark name '%s': "
	"must contain a '#'\n"), bookname);
	goto usage;
	}

	/*
	* expand source or bookname to full path:
	* one of them may be specified as short name
	*/
	{
	char **expand;
	char source_short, bookname_short;
	source_short = strpbrk(source, "@#");
	bookname_short = strpbrk(bookname, "#");
	if (source_short == source &&
	bookname_short == bookname) {
	(void) fprintf(stderr, gettext(
	"either source or bookmark must be specified as "
	"full dataset paths"));
	goto usage;
	} else if (source_short != source &&
	bookname_short != bookname) {
	expand = NULL;
	} else if (source_short != source) {
	strlcpy(expbuf, source, sizeof (expbuf));
	expand = &bookname;
	} else if (bookname_short != bookname) {
	strlcpy(expbuf, bookname, sizeof (expbuf));
	expand = &source;
	} else {
	abort();
	}
	if (expand != NULL) {
	strpbrk(expbuf, "@#") = '\0'; / dataset name in buf */
	(void) strlcat(expbuf, *expand, sizeof (expbuf));
	*expand = expbuf;
	}
	}

	/* determine source type */
	switch (*strpbrk(source, "@#")) {
	case '@': source_type = ZFS_TYPE_SNAPSHOT; break;
	case '#': source_type = ZFS_TYPE_BOOKMARK; break;
	default: abort();
	}

	/* test the source exists */
	zfs_handle_t *zhp;
	zhp = zfs_open(g_zfs, source, source_type);
	if (zhp == NULL)
	goto usage;
	zfs_close(zhp);

	nvl = fnvlist_alloc();
	fnvlist_add_string(nvl, bookname, source);
	ret = lzc_bookmark(nvl, NULL);
	fnvlist_free(nvl);

	if (ret != 0) {
	const char *err_msg = NULL;
	char errbuf[1024];

	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN,
	"cannot create bookmark '%s'"), bookname);

	switch (ret) {
	case EXDEV:
	err_msg = "bookmark is in a different pool";
	break;
	case ZFS_ERR_BOOKMARK_SOURCE_NOT_ANCESTOR:
	err_msg = "source is not an ancestor of the "
	"new bookmark's dataset";
	break;
	case EEXIST:
	err_msg = "bookmark exists";
	break;
	case EINVAL:
	err_msg = "invalid argument";
	break;
	case ENOTSUP:
	err_msg = "bookmark feature not enabled";
	break;
	case ENOSPC:
	err_msg = "out of space";
	break;
	case ENOENT:
	err_msg = "dataset does not exist";
	break;
	default:
	(void) zfs_standard_error(g_zfs, ret, errbuf);
	break;
	}
	if (err_msg != NULL) {
	(void) fprintf(stderr, "%s: %s\n", errbuf,
	dgettext(TEXT_DOMAIN, err_msg));
	}
	}

	return (ret != 0);

	usage:
	usage(B_FALSE);
	return (-1);
	}

	static int
	zfs_do_channel_program(int argc, char **argv)
	{
	int ret, fd, c;
	char progbuf, filename, *poolname;
	size_t progsize, progread;
	nvlist_t *outnvl = NULL;
	uint64_t instrlimit = ZCP_DEFAULT_INSTRLIMIT;
	uint64_t memlimit = ZCP_DEFAULT_MEMLIMIT;
	boolean_t sync_flag = B_TRUE, json_output = B_FALSE;
	zpool_handle_t *zhp;

	/* check options */
	while ((c = getopt(argc, argv, "nt:m:j")) != -1) {
	switch (c) {
	case 't':
	case 'm': {
	uint64_t arg;
	char *endp;

	errno = 0;
	arg = strtoull(optarg, &endp, 0);
	if (errno != 0 \|\| *endp != '\0') {
	(void) fprintf(stderr, gettext(
	"invalid argument "
	"'%s': expected integer\n"), optarg);
	goto usage;
	}

	if (c == 't') {
	instrlimit = arg;
	} else {
	ASSERT3U(c, ==, 'm');
	memlimit = arg;
	}
	break;
	}
	case 'n': {
	sync_flag = B_FALSE;
	break;
	}
	case 'j': {
	json_output = B_TRUE;
	break;
	}
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	goto usage;
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 2) {
	(void) fprintf(stderr,
	gettext("invalid number of arguments\n"));
	goto usage;
	}

	poolname = argv[0];
	filename = argv[1];
	if (strcmp(filename, "-") == 0) {
	fd = 0;
	filename = "standard input";
	} else if ((fd = open(filename, O_RDONLY)) < 0) {
	(void) fprintf(stderr, gettext("cannot open '%s': %s\n"),
	filename, strerror(errno));
	return (1);
	}

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL) {
	(void) fprintf(stderr, gettext("cannot open pool '%s'\n"),
	poolname);
	if (fd != 0)
	(void) close(fd);
	return (1);
	}
	zpool_close(zhp);

	/*
	* Read in the channel program, expanding the program buffer as
	* necessary.
	*/
	progread = 0;
	progsize = 1024;
	progbuf = safe_malloc(progsize);
	do {
	ret = read(fd, progbuf + progread, progsize - progread);
	progread += ret;
	if (progread == progsize && ret > 0) {
	progsize *= 2;
	progbuf = safe_realloc(progbuf, progsize);
	}
	} while (ret > 0);

	if (fd != 0)
	(void) close(fd);
	if (ret < 0) {
	free(progbuf);
	(void) fprintf(stderr,
	gettext("cannot read '%s': %s\n"),
	filename, strerror(errno));
	return (1);
	}
	progbuf[progread] = '\0';

	/*
	* Any remaining arguments are passed as arguments to the lua script as
	* a string array:
	* {
	* "argv" -> [ "arg 1", ... "arg n" ],
	* }
	*/
	nvlist_t *argnvl = fnvlist_alloc();
	fnvlist_add_string_array(argnvl, ZCP_ARG_CLIARGV, argv + 2, argc - 2);

	if (sync_flag) {
	ret = lzc_channel_program(poolname, progbuf,
	instrlimit, memlimit, argnvl, &outnvl);
	} else {
	ret = lzc_channel_program_nosync(poolname, progbuf,
	instrlimit, memlimit, argnvl, &outnvl);
	}

	if (ret != 0) {
	/*
	* On error, report the error message handed back by lua if one
	* exists. Otherwise, generate an appropriate error message,
	* falling back on strerror() for an unexpected return code.
	*/
	char *errstring = NULL;
	const char *msg = gettext("Channel program execution failed");
	uint64_t instructions = 0;
	if (outnvl != NULL && nvlist_exists(outnvl, ZCP_RET_ERROR)) {
	(void) nvlist_lookup_string(outnvl,
	ZCP_RET_ERROR, &errstring);
	if (errstring == NULL)
	errstring = strerror(ret);
	if (ret == ETIME) {
	(void) nvlist_lookup_uint64(outnvl,
	ZCP_ARG_INSTRLIMIT, &instructions);
	}
	} else {
	switch (ret) {
	case EINVAL:
	errstring =
	"Invalid instruction or memory limit.";
	break;
	case ENOMEM:
	errstring = "Return value too large.";
	break;
	case ENOSPC:
	errstring = "Memory limit exhausted.";
	break;
	case ETIME:
	errstring = "Timed out.";
	break;
	case EPERM:
	errstring = "Permission denied. Channel "
	"programs must be run as root.";
	break;
	default:
	(void) zfs_standard_error(g_zfs, ret, msg);
	}
	}
	if (errstring != NULL)
	(void) fprintf(stderr, "%s:\n%s\n", msg, errstring);

	if (ret == ETIME && instructions != 0)
	(void) fprintf(stderr,
	gettext("%llu Lua instructions\n"),
	(u_longlong_t)instructions);
	} else {
	if (json_output) {
	(void) nvlist_print_json(stdout, outnvl);
	} else if (nvlist_empty(outnvl)) {
	(void) fprintf(stdout, gettext("Channel program fully "
	"executed and did not produce output.\n"));
	} else {
	(void) fprintf(stdout, gettext("Channel program fully "
	"executed and produced output:\n"));
	dump_nvlist(outnvl, 4);
	}
	}

	free(progbuf);
	fnvlist_free(outnvl);
	fnvlist_free(argnvl);
	return (ret != 0);

	usage:
	usage(B_FALSE);
	return (-1);
	}


	typedef struct loadkey_cbdata {
	boolean_t cb_loadkey;
	boolean_t cb_recursive;
	boolean_t cb_noop;
	char *cb_keylocation;
	uint64_t cb_numfailed;
	uint64_t cb_numattempted;
	} loadkey_cbdata_t;

	static int
	load_key_callback(zfs_handle_t zhp, void data)
	{
	int ret;
	boolean_t is_encroot;
	loadkey_cbdata_t *cb = data;
	uint64_t keystatus = zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS);

	/*
	* If we are working recursively, we want to skip loading / unloading
	* keys for non-encryption roots and datasets whose keys are already
	* in the desired end-state.
	*/
	if (cb->cb_recursive) {
	ret = zfs_crypto_get_encryption_root(zhp, &is_encroot, NULL);
	if (ret != 0)
	return (ret);
	if (!is_encroot)
	return (0);

	if ((cb->cb_loadkey && keystatus == ZFS_KEYSTATUS_AVAILABLE) \|\|
	(!cb->cb_loadkey && keystatus == ZFS_KEYSTATUS_UNAVAILABLE))
	return (0);
	}

	cb->cb_numattempted++;

	if (cb->cb_loadkey)
	ret = zfs_crypto_load_key(zhp, cb->cb_noop, cb->cb_keylocation);
	else
	ret = zfs_crypto_unload_key(zhp);

	if (ret != 0) {
	cb->cb_numfailed++;
	return (ret);
	}

	return (0);
	}

	static int
	load_unload_keys(int argc, char **argv, boolean_t loadkey)
	{
	int c, ret = 0, flags = 0;
	boolean_t do_all = B_FALSE;
	loadkey_cbdata_t cb = { 0 };

	cb.cb_loadkey = loadkey;

	while ((c = getopt(argc, argv, "anrL:")) != -1) {
	/* noop and alternate keylocations only apply to zfs load-key */
	if (loadkey) {
	switch (c) {
	case 'n':
	cb.cb_noop = B_TRUE;
	continue;
	case 'L':
	cb.cb_keylocation = optarg;
	continue;
	default:
	break;
	}
	}

	switch (c) {
	case 'a':
	do_all = B_TRUE;
	cb.cb_recursive = B_TRUE;
	break;
	case 'r':
	flags \|= ZFS_ITER_RECURSE;
	cb.cb_recursive = B_TRUE;
	break;
	default:
	(void) fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (!do_all && argc == 0) {
	(void) fprintf(stderr,
	gettext("Missing dataset argument or -a option\n"));
	usage(B_FALSE);
	}

	if (do_all && argc != 0) {
	(void) fprintf(stderr,
	gettext("Cannot specify dataset with -a option\n"));
	usage(B_FALSE);
	}

	if (cb.cb_recursive && cb.cb_keylocation != NULL &&
	strcmp(cb.cb_keylocation, "prompt") != 0) {
	(void) fprintf(stderr, gettext("alternate keylocation may only "
	"be 'prompt' with -r or -a\n"));
	usage(B_FALSE);
	}

	ret = zfs_for_each(argc, argv, flags,
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME, NULL, NULL, 0,
	load_key_callback, &cb);

	if (cb.cb_noop \|\| (cb.cb_recursive && cb.cb_numattempted != 0)) {
	(void) printf(gettext("%llu / %llu key(s) successfully %s\n"),
	(u_longlong_t)(cb.cb_numattempted - cb.cb_numfailed),
	(u_longlong_t)cb.cb_numattempted,
	loadkey ? (cb.cb_noop ? "verified" : "loaded") :
	"unloaded");
	}

	if (cb.cb_numfailed != 0)
	ret = -1;

	return (ret);
	}

	static int
	zfs_do_load_key(int argc, char **argv)
	{
	return (load_unload_keys(argc, argv, B_TRUE));
	}


	static int
	zfs_do_unload_key(int argc, char **argv)
	{
	return (load_unload_keys(argc, argv, B_FALSE));
	}

	static int
	zfs_do_change_key(int argc, char **argv)
	{
	int c, ret;
	uint64_t keystatus;
	boolean_t loadkey = B_FALSE, inheritkey = B_FALSE;
	zfs_handle_t *zhp = NULL;
	nvlist_t *props = fnvlist_alloc();

	while ((c = getopt(argc, argv, "lio:")) != -1) {
	switch (c) {
	case 'l':
	loadkey = B_TRUE;
	break;
	case 'i':
	inheritkey = B_TRUE;
	break;
	case 'o':
	if (!parseprop(props, optarg)) {
	nvlist_free(props);
	return (1);
	}
	break;
	default:
	(void) fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	usage(B_FALSE);
	}
	}

	if (inheritkey && !nvlist_empty(props)) {
	(void) fprintf(stderr,
	gettext("Properties not allowed for inheriting\n"));
	usage(B_FALSE);
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("Missing dataset argument\n"));
	usage(B_FALSE);
	}

	if (argc > 1) {
	(void) fprintf(stderr, gettext("Too many arguments\n"));
	usage(B_FALSE);
	}

	zhp = zfs_open(g_zfs, argv[argc - 1],
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL)
	usage(B_FALSE);

	if (loadkey) {
	keystatus = zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS);
	if (keystatus != ZFS_KEYSTATUS_AVAILABLE) {
	ret = zfs_crypto_load_key(zhp, B_FALSE, NULL);
	if (ret != 0) {
	nvlist_free(props);
	zfs_close(zhp);
	return (-1);
	}
	}

	/* refresh the properties so the new keystatus is visible */
	zfs_refresh_properties(zhp);
	}

	ret = zfs_crypto_rewrap(zhp, props, inheritkey);
	if (ret != 0) {
	nvlist_free(props);
	zfs_close(zhp);
	return (-1);
	}

	nvlist_free(props);
	zfs_close(zhp);
	return (0);
	}

	/*
	* 1) zfs project [-d\|-r] <file\|directory ...>
	* List project ID and inherit flag of file(s) or directories.
	* -d: List the directory itself, not its children.
	* -r: List subdirectories recursively.
	*
	* 2) zfs project -C [-k] [-r] <file\|directory ...>
	* Clear project inherit flag and/or ID on the file(s) or directories.
	* -k: Keep the project ID unchanged. If not specified, the project ID
	* will be reset as zero.
	* -r: Clear on subdirectories recursively.
	*
	* 3) zfs project -c [-0] [-d\|-r] [-p id] <file\|directory ...>
	* Check project ID and inherit flag on the file(s) or directories,
	* report the outliers.
	* -0: Print file name followed by a NUL instead of newline.
	* -d: Check the directory itself, not its children.
	* -p: Specify the referenced ID for comparing with the target file(s)
	* or directories' project IDs. If not specified, the target (top)
	* directory's project ID will be used as the referenced one.
	* -r: Check subdirectories recursively.
	*
	* 4) zfs project [-p id] [-r] [-s] <file\|directory ...>
	* Set project ID and/or inherit flag on the file(s) or directories.
	* -p: Set the project ID as the given id.
	* -r: Set on subdirectories recursively. If not specify "-p" option,
	* it will use top-level directory's project ID as the given id,
	* then set both project ID and inherit flag on all descendants
	* of the top-level directory.
	* -s: Set project inherit flag.
	*/
	static int
	zfs_do_project(int argc, char **argv)
	{
	zfs_project_control_t zpc = {
	.zpc_expected_projid = ZFS_INVALID_PROJID,
	.zpc_op = ZFS_PROJECT_OP_DEFAULT,
	.zpc_dironly = B_FALSE,
	.zpc_keep_projid = B_FALSE,
	.zpc_newline = B_TRUE,
	.zpc_recursive = B_FALSE,
	.zpc_set_flag = B_FALSE,
	};
	int ret = 0, c;

	if (argc < 2)
	usage(B_FALSE);

	while ((c = getopt(argc, argv, "0Ccdkp:rs")) != -1) {
	switch (c) {
	case '0':
	zpc.zpc_newline = B_FALSE;
	break;
	case 'C':
	if (zpc.zpc_op != ZFS_PROJECT_OP_DEFAULT) {
	(void) fprintf(stderr, gettext("cannot "
	"specify '-C' '-c' '-s' together\n"));
	usage(B_FALSE);
	}

	zpc.zpc_op = ZFS_PROJECT_OP_CLEAR;
	break;
	case 'c':
	if (zpc.zpc_op != ZFS_PROJECT_OP_DEFAULT) {
	(void) fprintf(stderr, gettext("cannot "
	"specify '-C' '-c' '-s' together\n"));
	usage(B_FALSE);
	}

	zpc.zpc_op = ZFS_PROJECT_OP_CHECK;
	break;
	case 'd':
	zpc.zpc_dironly = B_TRUE;
	/* overwrite "-r" option */
	zpc.zpc_recursive = B_FALSE;
	break;
	case 'k':
	zpc.zpc_keep_projid = B_TRUE;
	break;
	case 'p': {
	char *endptr;

	errno = 0;
	zpc.zpc_expected_projid = strtoull(optarg, &endptr, 0);
	if (errno != 0 \|\| *endptr != '\0') {
	(void) fprintf(stderr,
	gettext("project ID must be less than "
	"%u\n"), UINT32_MAX);
	usage(B_FALSE);
	}
	if (zpc.zpc_expected_projid >= UINT32_MAX) {
	(void) fprintf(stderr,
	gettext("invalid project ID\n"));
	usage(B_FALSE);
	}
	break;
	}
	case 'r':
	zpc.zpc_recursive = B_TRUE;
	/* overwrite "-d" option */
	zpc.zpc_dironly = B_FALSE;
	break;
	case 's':
	if (zpc.zpc_op != ZFS_PROJECT_OP_DEFAULT) {
	(void) fprintf(stderr, gettext("cannot "
	"specify '-C' '-c' '-s' together\n"));
	usage(B_FALSE);
	}

	zpc.zpc_set_flag = B_TRUE;
	zpc.zpc_op = ZFS_PROJECT_OP_SET;
	break;
	default:
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	if (zpc.zpc_op == ZFS_PROJECT_OP_DEFAULT) {
	if (zpc.zpc_expected_projid != ZFS_INVALID_PROJID)
	zpc.zpc_op = ZFS_PROJECT_OP_SET;
	else
	zpc.zpc_op = ZFS_PROJECT_OP_LIST;
	}

	switch (zpc.zpc_op) {
	case ZFS_PROJECT_OP_LIST:
	if (zpc.zpc_keep_projid) {
	(void) fprintf(stderr,
	gettext("'-k' is only valid together with '-C'\n"));
	usage(B_FALSE);
	}
	if (!zpc.zpc_newline) {
	(void) fprintf(stderr,
	gettext("'-0' is only valid together with '-c'\n"));
	usage(B_FALSE);
	}
	break;
	case ZFS_PROJECT_OP_CHECK:
	if (zpc.zpc_keep_projid) {
	(void) fprintf(stderr,
	gettext("'-k' is only valid together with '-C'\n"));
	usage(B_FALSE);
	}
	break;
	case ZFS_PROJECT_OP_CLEAR:
	if (zpc.zpc_dironly) {
	(void) fprintf(stderr,
	gettext("'-d' is useless together with '-C'\n"));
	usage(B_FALSE);
	}
	if (!zpc.zpc_newline) {
	(void) fprintf(stderr,
	gettext("'-0' is only valid together with '-c'\n"));
	usage(B_FALSE);
	}
	if (zpc.zpc_expected_projid != ZFS_INVALID_PROJID) {
	(void) fprintf(stderr,
	gettext("'-p' is useless together with '-C'\n"));
	usage(B_FALSE);
	}
	break;
	case ZFS_PROJECT_OP_SET:
	if (zpc.zpc_dironly) {
	(void) fprintf(stderr,
	gettext("'-d' is useless for set project ID and/or "
	"inherit flag\n"));
	usage(B_FALSE);
	}
	if (zpc.zpc_keep_projid) {
	(void) fprintf(stderr,
	gettext("'-k' is only valid together with '-C'\n"));
	usage(B_FALSE);
	}
	if (!zpc.zpc_newline) {
	(void) fprintf(stderr,
	gettext("'-0' is only valid together with '-c'\n"));
	usage(B_FALSE);
	}
	break;
	default:
	ASSERT(0);
	break;
	}

	argv += optind;
	argc -= optind;
	if (argc == 0) {
	(void) fprintf(stderr,
	gettext("missing file or directory target(s)\n"));
	usage(B_FALSE);
	}

	for (int i = 0; i < argc; i++) {
	int err;

	err = zfs_project_handle(argv[i], &zpc);
	if (err && !ret)
	ret = err;
	}

	return (ret);
	}

	static int
	zfs_do_wait(int argc, char **argv)
	{
	boolean_t enabled[ZFS_WAIT_NUM_ACTIVITIES];
	int error, i;
	int c;

	/* By default, wait for all types of activity. */
	for (i = 0; i < ZFS_WAIT_NUM_ACTIVITIES; i++)
	enabled[i] = B_TRUE;

	while ((c = getopt(argc, argv, "t:")) != -1) {
	switch (c) {
	case 't':
	{
	static char *col_subopts[] = { "deleteq", NULL };
	char *value;

	/* Reset activities array */
	bzero(&enabled, sizeof (enabled));
	while (*optarg != '\0') {
	int activity = getsubopt(&optarg, col_subopts,
	&value);

	if (activity < 0) {
	(void) fprintf(stderr,
	gettext("invalid activity '%s'\n"),
	value);
	usage(B_FALSE);
	}

	enabled[activity] = B_TRUE;
	}
	break;
	}
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argv += optind;
	argc -= optind;
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing 'filesystem' "
	"argument\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	zfs_handle_t *zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM);
	if (zhp == NULL)
	return (1);

	for (;;) {
	boolean_t missing = B_FALSE;
	boolean_t any_waited = B_FALSE;

	for (int i = 0; i < ZFS_WAIT_NUM_ACTIVITIES; i++) {
	boolean_t waited;

	if (!enabled[i])
	continue;

	error = zfs_wait_status(zhp, i, &missing, &waited);
	if (error != 0 \|\| missing)
	break;

	any_waited = (any_waited \|\| waited);
	}

	if (error != 0 \|\| missing \|\| !any_waited)
	break;
	}

	zfs_close(zhp);

	return (error);
	}

	/*
	* Display version message
	*/
	static int
	zfs_do_version(int argc, char **argv)
	{
	if (zfs_version_print() == -1)
	return (1);

	return (0);
	}

	int
	main(int argc, char **argv)
	{
	int ret = 0;
	int i = 0;
	char *cmdname;
	char **newargv;

	(void) setlocale(LC_ALL, "");
	(void) setlocale(LC_NUMERIC, "C");
	(void) textdomain(TEXT_DOMAIN);

	opterr = 0;

	/*
	* Make sure the user has specified some command.
	*/
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing command\n"));
	usage(B_FALSE);
	}

	cmdname = argv[1];

	/*
	* The 'umount' command is an alias for 'unmount'
	*/
	if (strcmp(cmdname, "umount") == 0)
	cmdname = "unmount";

	/*
	* The 'recv' command is an alias for 'receive'
	*/
	if (strcmp(cmdname, "recv") == 0)
	cmdname = "receive";

	/*
	* The 'snap' command is an alias for 'snapshot'
	*/
	if (strcmp(cmdname, "snap") == 0)
	cmdname = "snapshot";

	/*
	* Special case '-?'
	*/
	if ((strcmp(cmdname, "-?") == 0) \|\|
	(strcmp(cmdname, "--help") == 0))
	usage(B_TRUE);

	/*
	* Special case '-V\|--version'
	*/
	if ((strcmp(cmdname, "-V") == 0) \|\| (strcmp(cmdname, "--version") == 0))
	return (zfs_do_version(argc, argv));

	if ((g_zfs = libzfs_init()) == NULL) {
	(void) fprintf(stderr, "%s\n", libzfs_error_init(errno));
	return (1);
	}

	mnttab_file = g_zfs->libzfs_mnttab;

	zfs_save_arguments(argc, argv, history_str, sizeof (history_str));

	libzfs_print_on_error(g_zfs, B_TRUE);

	/*
	* Many commands modify input strings for string parsing reasons.
	* We create a copy to protect the original argv.
	*/
	newargv = malloc((argc + 1) * sizeof (newargv[0]));
	for (i = 0; i < argc; i++)
	newargv[i] = strdup(argv[i]);
	newargv[argc] = NULL;

	/*
	* Run the appropriate command.
	*/
	libzfs_mnttab_cache(g_zfs, B_TRUE);
	if (find_command_idx(cmdname, &i) == 0) {
	current_command = &command_table[i];
	ret = command_table[i].func(argc - 1, newargv + 1);
	} else if (strchr(cmdname, '=') != NULL) {
	verify(find_command_idx("set", &i) == 0);
	current_command = &command_table[i];
	ret = command_table[i].func(argc, newargv);
	} else {
	(void) fprintf(stderr, gettext("unrecognized "
	"command '%s'\n"), cmdname);
	usage(B_FALSE);
	ret = 1;
	}

	for (i = 0; i < argc; i++)
	free(newargv[i]);
	free(newargv);

	if (ret == 0 && log_history)
	(void) zpool_log_history(g_zfs, history_str);

	libzfs_fini(g_zfs);

	/*
	* The 'ZFS_ABORT' environment variable causes us to dump core on exit
	* for the purposes of running ::findleaks.
	*/
	if (getenv("ZFS_ABORT") != NULL) {
	(void) printf("dumping core by request\n");
	abort();
	}

	return (ret);
	}

	#ifdef __FreeBSD__
	#include <sys/jail.h>
	#include <jail.h>
	/*
	* Attach/detach the given dataset to/from the given jail
	*/
	/* ARGSUSED */
	static int
	zfs_do_jail_impl(int argc, char **argv, boolean_t attach)
	{
	zfs_handle_t *zhp;
	int jailid, ret;

	/* check number of arguments */
	if (argc < 3) {
	(void) fprintf(stderr, gettext("missing argument(s)\n"));
	usage(B_FALSE);
	}
	if (argc > 3) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	jailid = jail_getid(argv[1]);
	if (jailid < 0) {
	(void) fprintf(stderr, gettext("invalid jail id or name\n"));
	usage(B_FALSE);
	}

	zhp = zfs_open(g_zfs, argv[2], ZFS_TYPE_FILESYSTEM);
	if (zhp == NULL)
	return (1);

	ret = (zfs_jail(zhp, jailid, attach) != 0);

	zfs_close(zhp);
	return (ret);
	}

	/*
	* zfs jail jailid filesystem
	*
	* Attach the given dataset to the given jail
	*/
	/* ARGSUSED */
	static int
	zfs_do_jail(int argc, char **argv)
	{
	return (zfs_do_jail_impl(argc, argv, B_TRUE));
	}

	/*
	* zfs unjail jailid filesystem
	*
	* Detach the given dataset from the given jail
	*/
	/* ARGSUSED */
	static int
	zfs_do_unjail(int argc, char **argv)
	{
	return (zfs_do_jail_impl(argc, argv, B_FALSE));
	}
	#endif
	diff --git a/sys/contrib/openzfs/cmd/zpool/zpool.d/media b/sys/contrib/openzfs/cmd/zpool/zpool.d/media
	index 05bc15918bc9..5683cdc3c023 100755
	--- a/sys/contrib/openzfs/cmd/zpool/zpool.d/media
	+++ b/sys/contrib/openzfs/cmd/zpool/zpool.d/media
	@@ -1,27 +1,34 @@
	#!/bin/sh
	#
	# Print out the type of device
	#

	if [ "$1" = "-h" ] ; then
	- echo "Show whether a vdev is a file, hdd, or ssd."
	+ echo "Show whether a vdev is a file, hdd, ssd, or iscsi."
	exit
	fi

	if [ -b "$VDEV_UPATH" ]; then
	device=$(basename "$VDEV_UPATH")
	val=$(cat "/sys/block/$device/queue/rotational" 2>/dev/null)
	if [ "$val" = "0" ]; then
	MEDIA="ssd"
	fi

	if [ "$val" = "1" ]; then
	MEDIA="hdd"
	fi
	+
	+ vpd_pg83="/sys/block/$device/device/vpd_pg83"
	+ if [ -f "$vpd_pg83" ]; then
	+ if grep -q --binary "iqn." "$vpd_pg83"; then
	+ MEDIA="iscsi"
	+ fi
	+ fi
	else
	if [ -f "$VDEV_UPATH" ]; then
	MEDIA="file"
	fi
	fi

	echo "media=$MEDIA"
	diff --git a/sys/contrib/openzfs/cmd/zpool/zpool_main.c b/sys/contrib/openzfs/cmd/zpool/zpool_main.c
	index a8c3aedc03b0..f95aece9561d 100644
	--- a/sys/contrib/openzfs/cmd/zpool/zpool_main.c
	+++ b/sys/contrib/openzfs/cmd/zpool/zpool_main.c
	@@ -1,10747 +1,10783 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2012 by Frederik Wessels. All rights reserved.
	* Copyright (c) 2012 by Cyril Plisko. All rights reserved.
	* Copyright (c) 2013 by Prasad Joshi (sTec). All rights reserved.
	* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
	* Copyright (c) 2017 Datto Inc.
	* Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
	* Copyright (c) 2017, Intel Corporation.
	* Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>
	* Copyright (c) 2021, Colm Buckley <colm@tuatha.org>
	* Copyright [2021] Hewlett Packard Enterprise Development LP
	*/

	#include <assert.h>
	#include <ctype.h>
	#include <dirent.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <getopt.h>
	#include <libgen.h>
	#include <libintl.h>
	#include <libuutil.h>
	#include <locale.h>
	#include <pthread.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <strings.h>
	#include <time.h>
	#include <unistd.h>
	#include <pwd.h>
	#include <zone.h>
	#include <sys/wait.h>
	#include <zfs_prop.h>
	#include <sys/fs/zfs.h>
	#include <sys/stat.h>
	#include <sys/systeminfo.h>
	#include <sys/fm/fs/zfs.h>
	#include <sys/fm/util.h>
	#include <sys/fm/protocol.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/mount.h>
	#include <sys/sysmacros.h>

	#include <math.h>

	#include <libzfs.h>
	#include <libzutil.h>

	#include "zpool_util.h"
	#include "zfs_comutil.h"
	#include "zfeature_common.h"

	#include "statcommon.h"

	libzfs_handle_t *g_zfs;

	static int zpool_do_create(int, char **);
	static int zpool_do_destroy(int, char **);

	static int zpool_do_add(int, char **);
	static int zpool_do_remove(int, char **);
	static int zpool_do_labelclear(int, char **);

	static int zpool_do_checkpoint(int, char **);

	static int zpool_do_list(int, char **);
	static int zpool_do_iostat(int, char **);
	static int zpool_do_status(int, char **);

	static int zpool_do_online(int, char **);
	static int zpool_do_offline(int, char **);
	static int zpool_do_clear(int, char **);
	static int zpool_do_reopen(int, char **);

	static int zpool_do_reguid(int, char **);

	static int zpool_do_attach(int, char **);
	static int zpool_do_detach(int, char **);
	static int zpool_do_replace(int, char **);
	static int zpool_do_split(int, char **);

	static int zpool_do_initialize(int, char **);
	static int zpool_do_scrub(int, char **);
	static int zpool_do_resilver(int, char **);
	static int zpool_do_trim(int, char **);

	static int zpool_do_import(int, char **);
	static int zpool_do_export(int, char **);

	static int zpool_do_upgrade(int, char **);

	static int zpool_do_history(int, char **);
	static int zpool_do_events(int, char **);

	static int zpool_do_get(int, char **);
	static int zpool_do_set(int, char **);

	static int zpool_do_sync(int, char **);

	static int zpool_do_version(int, char **);

	static int zpool_do_wait(int, char **);

	static zpool_compat_status_t zpool_do_load_compat(
	const char , boolean_t );

	/*
	* These libumem hooks provide a reasonable set of defaults for the allocator's
	* debugging facilities.
	*/

	#ifdef DEBUG
	const char *
	_umem_debug_init(void)
	{
	return ("default,verbose"); /* $UMEM_DEBUG setting */
	}

	const char *
	_umem_logging_init(void)
	{
	return ("fail,contents"); /* $UMEM_LOGGING setting */
	}
	#endif

	typedef enum {
	HELP_ADD,
	HELP_ATTACH,
	HELP_CLEAR,
	HELP_CREATE,
	HELP_CHECKPOINT,
	HELP_DESTROY,
	HELP_DETACH,
	HELP_EXPORT,
	HELP_HISTORY,
	HELP_IMPORT,
	HELP_IOSTAT,
	HELP_LABELCLEAR,
	HELP_LIST,
	HELP_OFFLINE,
	HELP_ONLINE,
	HELP_REPLACE,
	HELP_REMOVE,
	HELP_INITIALIZE,
	HELP_SCRUB,
	HELP_RESILVER,
	HELP_TRIM,
	HELP_STATUS,
	HELP_UPGRADE,
	HELP_EVENTS,
	HELP_GET,
	HELP_SET,
	HELP_SPLIT,
	HELP_SYNC,
	HELP_REGUID,
	HELP_REOPEN,
	HELP_VERSION,
	HELP_WAIT
	} zpool_help_t;


	/*
	* Flags for stats to display with "zpool iostats"
	*/
	enum iostat_type {
	IOS_DEFAULT = 0,
	IOS_LATENCY = 1,
	IOS_QUEUES = 2,
	IOS_L_HISTO = 3,
	IOS_RQ_HISTO = 4,
	IOS_COUNT, /* always last element */
	};

	/* iostat_type entries as bitmasks */
	#define IOS_DEFAULT_M (1ULL << IOS_DEFAULT)
	#define IOS_LATENCY_M (1ULL << IOS_LATENCY)
	#define IOS_QUEUES_M (1ULL << IOS_QUEUES)
	#define IOS_L_HISTO_M (1ULL << IOS_L_HISTO)
	#define IOS_RQ_HISTO_M (1ULL << IOS_RQ_HISTO)

	/* Mask of all the histo bits */
	#define IOS_ANYHISTO_M (IOS_L_HISTO_M \| IOS_RQ_HISTO_M)

	/*
	* Lookup table for iostat flags to nvlist names. Basically a list
	* of all the nvlists a flag requires. Also specifies the order in
	* which data gets printed in zpool iostat.
	*/
	static const char *vsx_type_to_nvlist[IOS_COUNT][13] = {
	[IOS_L_HISTO] = {
	ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_SYNC_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_SYNC_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_ASYNC_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_ASYNC_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_SCRUB_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_TRIM_LAT_HISTO,
	NULL},
	[IOS_LATENCY] = {
	ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_TRIM_LAT_HISTO,
	NULL},
	[IOS_QUEUES] = {
	ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_TRIM_ACTIVE_QUEUE,
	NULL},
	[IOS_RQ_HISTO] = {
	ZPOOL_CONFIG_VDEV_SYNC_IND_R_HISTO,
	ZPOOL_CONFIG_VDEV_SYNC_AGG_R_HISTO,
	ZPOOL_CONFIG_VDEV_SYNC_IND_W_HISTO,
	ZPOOL_CONFIG_VDEV_SYNC_AGG_W_HISTO,
	ZPOOL_CONFIG_VDEV_ASYNC_IND_R_HISTO,
	ZPOOL_CONFIG_VDEV_ASYNC_AGG_R_HISTO,
	ZPOOL_CONFIG_VDEV_ASYNC_IND_W_HISTO,
	ZPOOL_CONFIG_VDEV_ASYNC_AGG_W_HISTO,
	ZPOOL_CONFIG_VDEV_IND_SCRUB_HISTO,
	ZPOOL_CONFIG_VDEV_AGG_SCRUB_HISTO,
	ZPOOL_CONFIG_VDEV_IND_TRIM_HISTO,
	ZPOOL_CONFIG_VDEV_AGG_TRIM_HISTO,
	NULL},
	};


	/*
	* Given a cb->cb_flags with a histogram bit set, return the iostat_type.
	* Right now, only one histo bit is ever set at one time, so we can
	* just do a highbit64(a)
	*/
	#define IOS_HISTO_IDX(a) (highbit64(a & IOS_ANYHISTO_M) - 1)

	typedef struct zpool_command {
	const char *name;
	int (func)(int, char *);
	zpool_help_t usage;
	} zpool_command_t;

	/*
	* Master command table. Each ZFS command has a name, associated function, and
	* usage message. The usage messages need to be internationalized, so we have
	* to have a function to return the usage message based on a command index.
	*
	* These commands are organized according to how they are displayed in the usage
	* message. An empty command (one with a NULL name) indicates an empty line in
	* the generic usage message.
	*/
	static zpool_command_t command_table[] = {
	{ "version", zpool_do_version, HELP_VERSION },
	{ NULL },
	{ "create", zpool_do_create, HELP_CREATE },
	{ "destroy", zpool_do_destroy, HELP_DESTROY },
	{ NULL },
	{ "add", zpool_do_add, HELP_ADD },
	{ "remove", zpool_do_remove, HELP_REMOVE },
	{ NULL },
	{ "labelclear", zpool_do_labelclear, HELP_LABELCLEAR },
	{ NULL },
	{ "checkpoint", zpool_do_checkpoint, HELP_CHECKPOINT },
	{ NULL },
	{ "list", zpool_do_list, HELP_LIST },
	{ "iostat", zpool_do_iostat, HELP_IOSTAT },
	{ "status", zpool_do_status, HELP_STATUS },
	{ NULL },
	{ "online", zpool_do_online, HELP_ONLINE },
	{ "offline", zpool_do_offline, HELP_OFFLINE },
	{ "clear", zpool_do_clear, HELP_CLEAR },
	{ "reopen", zpool_do_reopen, HELP_REOPEN },
	{ NULL },
	{ "attach", zpool_do_attach, HELP_ATTACH },
	{ "detach", zpool_do_detach, HELP_DETACH },
	{ "replace", zpool_do_replace, HELP_REPLACE },
	{ "split", zpool_do_split, HELP_SPLIT },
	{ NULL },
	{ "initialize", zpool_do_initialize, HELP_INITIALIZE },
	{ "resilver", zpool_do_resilver, HELP_RESILVER },
	{ "scrub", zpool_do_scrub, HELP_SCRUB },
	{ "trim", zpool_do_trim, HELP_TRIM },
	{ NULL },
	{ "import", zpool_do_import, HELP_IMPORT },
	{ "export", zpool_do_export, HELP_EXPORT },
	{ "upgrade", zpool_do_upgrade, HELP_UPGRADE },
	{ "reguid", zpool_do_reguid, HELP_REGUID },
	{ NULL },
	{ "history", zpool_do_history, HELP_HISTORY },
	{ "events", zpool_do_events, HELP_EVENTS },
	{ NULL },
	{ "get", zpool_do_get, HELP_GET },
	{ "set", zpool_do_set, HELP_SET },
	{ "sync", zpool_do_sync, HELP_SYNC },
	{ NULL },
	{ "wait", zpool_do_wait, HELP_WAIT },
	};

	#define NCOMMAND (ARRAY_SIZE(command_table))

	#define VDEV_ALLOC_CLASS_LOGS "logs"

	static zpool_command_t *current_command;
	static char history_str[HIS_MAX_RECORD_LEN];
	static boolean_t log_history = B_TRUE;
	static uint_t timestamp_fmt = NODATE;

	static const char *
	get_usage(zpool_help_t idx)
	{
	switch (idx) {
	case HELP_ADD:
	return (gettext("\tadd [-fgLnP] [-o property=value] "
	"<pool> <vdev> ...\n"));
	case HELP_ATTACH:
	return (gettext("\tattach [-fsw] [-o property=value] "
	"<pool> <device> <new-device>\n"));
	case HELP_CLEAR:
	return (gettext("\tclear [-nF] <pool> [device]\n"));
	case HELP_CREATE:
	return (gettext("\tcreate [-fnd] [-o property=value] ... \n"
	"\t [-O file-system-property=value] ... \n"
	"\t [-m mountpoint] [-R root] <pool> <vdev> ...\n"));
	case HELP_CHECKPOINT:
	return (gettext("\tcheckpoint [-d [-w]] <pool> ...\n"));
	case HELP_DESTROY:
	return (gettext("\tdestroy [-f] <pool>\n"));
	case HELP_DETACH:
	return (gettext("\tdetach <pool> <device>\n"));
	case HELP_EXPORT:
	return (gettext("\texport [-af] <pool> ...\n"));
	case HELP_HISTORY:
	return (gettext("\thistory [-il] [<pool>] ...\n"));
	case HELP_IMPORT:
	return (gettext("\timport [-d dir] [-D]\n"
	"\timport [-o mntopts] [-o property=value] ... \n"
	"\t [-d dir \| -c cachefile] [-D] [-l] [-f] [-m] [-N] "
	"[-R root] [-F [-n]] -a\n"
	"\timport [-o mntopts] [-o property=value] ... \n"
	"\t [-d dir \| -c cachefile] [-D] [-l] [-f] [-m] [-N] "
	"[-R root] [-F [-n]]\n"
	"\t [--rewind-to-checkpoint] <pool \| id> [newpool]\n"));
	case HELP_IOSTAT:
	return (gettext("\tiostat [[[-c [script1,script2,...]"
	"[-lq]]\|[-rw]] [-T d \| u] [-ghHLpPvy]\n"
	"\t [[pool ...]\|[pool vdev ...]\|[vdev ...]]"
	" [[-n] interval [count]]\n"));
	case HELP_LABELCLEAR:
	return (gettext("\tlabelclear [-f] <vdev>\n"));
	case HELP_LIST:
	return (gettext("\tlist [-gHLpPv] [-o property[,...]] "
	"[-T d\|u] [pool] ... \n"
	"\t [interval [count]]\n"));
	case HELP_OFFLINE:
	return (gettext("\toffline [-f] [-t] <pool> <device> ...\n"));
	case HELP_ONLINE:
	return (gettext("\tonline [-e] <pool> <device> ...\n"));
	case HELP_REPLACE:
	return (gettext("\treplace [-fsw] [-o property=value] "
	"<pool> <device> [new-device]\n"));
	case HELP_REMOVE:
	return (gettext("\tremove [-npsw] <pool> <device> ...\n"));
	case HELP_REOPEN:
	return (gettext("\treopen [-n] <pool>\n"));
	case HELP_INITIALIZE:
	return (gettext("\tinitialize [-c \| -s] [-w] <pool> "
	"[<device> ...]\n"));
	case HELP_SCRUB:
	return (gettext("\tscrub [-s \| -p] [-w] <pool> ...\n"));
	case HELP_RESILVER:
	return (gettext("\tresilver <pool> ...\n"));
	case HELP_TRIM:
	return (gettext("\ttrim [-dw] [-r <rate>] [-c \| -s] <pool> "
	"[<device> ...]\n"));
	case HELP_STATUS:
	return (gettext("\tstatus [-c [script1,script2,...]] "
	"[-igLpPstvxD] [-T d\|u] [pool] ... \n"
	"\t [interval [count]]\n"));
	case HELP_UPGRADE:
	return (gettext("\tupgrade\n"
	"\tupgrade -v\n"
	"\tupgrade [-V version] <-a \| pool ...>\n"));
	case HELP_EVENTS:
	return (gettext("\tevents [-vHf [pool] \| -c]\n"));
	case HELP_GET:
	return (gettext("\tget [-Hp] [-o \"all\" \| field[,...]] "
	"<\"all\" \| property[,...]> <pool> ...\n"));
	case HELP_SET:
	return (gettext("\tset <property=value> <pool> \n"));
	case HELP_SPLIT:
	return (gettext("\tsplit [-gLnPl] [-R altroot] [-o mntopts]\n"
	"\t [-o property=value] <pool> <newpool> "
	"[<device> ...]\n"));
	case HELP_REGUID:
	return (gettext("\treguid <pool>\n"));
	case HELP_SYNC:
	return (gettext("\tsync [pool] ...\n"));
	case HELP_VERSION:
	return (gettext("\tversion\n"));
	case HELP_WAIT:
	return (gettext("\twait [-Hp] [-T d\|u] [-t <activity>[,...]] "
	"<pool> [interval]\n"));
	}

	abort();
	/* NOTREACHED */
	}

	static void
	zpool_collect_leaves(zpool_handle_t zhp, nvlist_t nvroot, nvlist_t *res)
	{
	uint_t children = 0;
	nvlist_t **child;
	uint_t i;

	(void) nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	&child, &children);

	if (children == 0) {
	char *path = zpool_vdev_name(g_zfs, zhp, nvroot,
	VDEV_NAME_PATH);

	if (strcmp(path, VDEV_TYPE_INDIRECT) != 0 &&
	strcmp(path, VDEV_TYPE_HOLE) != 0)
	fnvlist_add_boolean(res, path);

	free(path);
	return;
	}

	for (i = 0; i < children; i++) {
	zpool_collect_leaves(zhp, child[i], res);
	}
	}

	/*
	* Callback routine that will print out a pool property value.
	*/
	static int
	print_prop_cb(int prop, void *cb)
	{
	FILE *fp = cb;

	(void) fprintf(fp, "\t%-19s ", zpool_prop_to_name(prop));

	if (zpool_prop_readonly(prop))
	(void) fprintf(fp, " NO ");
	else
	(void) fprintf(fp, " YES ");

	if (zpool_prop_values(prop) == NULL)
	(void) fprintf(fp, "-\n");
	else
	(void) fprintf(fp, "%s\n", zpool_prop_values(prop));

	return (ZPROP_CONT);
	}

	/*
	* Display usage message. If we're inside a command, display only the usage for
	* that command. Otherwise, iterate over the entire command table and display
	* a complete usage message.
	*/
	static void
	usage(boolean_t requested)
	{
	FILE *fp = requested ? stdout : stderr;

	if (current_command == NULL) {
	int i;

	(void) fprintf(fp, gettext("usage: zpool command args ...\n"));
	(void) fprintf(fp,
	gettext("where 'command' is one of the following:\n\n"));

	for (i = 0; i < NCOMMAND; i++) {
	if (command_table[i].name == NULL)
	(void) fprintf(fp, "\n");
	else
	(void) fprintf(fp, "%s",
	get_usage(command_table[i].usage));
	}
	} else {
	(void) fprintf(fp, gettext("usage:\n"));
	(void) fprintf(fp, "%s", get_usage(current_command->usage));
	}

	if (current_command != NULL &&
	((strcmp(current_command->name, "set") == 0) \|\|
	(strcmp(current_command->name, "get") == 0) \|\|
	(strcmp(current_command->name, "list") == 0))) {

	(void) fprintf(fp,
	gettext("\nthe following properties are supported:\n"));

	(void) fprintf(fp, "\n\t%-19s %s %s\n\n",
	"PROPERTY", "EDIT", "VALUES");

	/* Iterate over all properties */
	(void) zprop_iter(print_prop_cb, fp, B_FALSE, B_TRUE,
	ZFS_TYPE_POOL);

	(void) fprintf(fp, "\t%-19s ", "feature@...");
	(void) fprintf(fp, "YES disabled \| enabled \| active\n");

	(void) fprintf(fp, gettext("\nThe feature@ properties must be "
	"appended with a feature name.\nSee zpool-features(7).\n"));
	}

	/*
	* See comments at end of main().
	*/
	if (getenv("ZFS_ABORT") != NULL) {
	(void) printf("dumping core by request\n");
	abort();
	}

	exit(requested ? 0 : 2);
	}

	/*
	* zpool initialize [-c \| -s] [-w] <pool> [<vdev> ...]
	* Initialize all unused blocks in the specified vdevs, or all vdevs in the pool
	* if none specified.
	*
	* -c Cancel. Ends active initializing.
	* -s Suspend. Initializing can then be restarted with no flags.
	* -w Wait. Blocks until initializing has completed.
	*/
	int
	zpool_do_initialize(int argc, char **argv)
	{
	int c;
	char *poolname;
	zpool_handle_t *zhp;
	nvlist_t *vdevs;
	int err = 0;
	boolean_t wait = B_FALSE;

	struct option long_options[] = {
	{"cancel", no_argument, NULL, 'c'},
	{"suspend", no_argument, NULL, 's'},
	{"wait", no_argument, NULL, 'w'},
	{0, 0, 0, 0}
	};

	pool_initialize_func_t cmd_type = POOL_INITIALIZE_START;
	while ((c = getopt_long(argc, argv, "csw", long_options, NULL)) != -1) {
	switch (c) {
	case 'c':
	if (cmd_type != POOL_INITIALIZE_START &&
	cmd_type != POOL_INITIALIZE_CANCEL) {
	(void) fprintf(stderr, gettext("-c cannot be "
	"combined with other options\n"));
	usage(B_FALSE);
	}
	cmd_type = POOL_INITIALIZE_CANCEL;
	break;
	case 's':
	if (cmd_type != POOL_INITIALIZE_START &&
	cmd_type != POOL_INITIALIZE_SUSPEND) {
	(void) fprintf(stderr, gettext("-s cannot be "
	"combined with other options\n"));
	usage(B_FALSE);
	}
	cmd_type = POOL_INITIALIZE_SUSPEND;
	break;
	case 'w':
	wait = B_TRUE;
	break;
	case '?':
	if (optopt != 0) {
	(void) fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	} else {
	(void) fprintf(stderr,
	gettext("invalid option '%s'\n"),
	argv[optind - 1]);
	}
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	usage(B_FALSE);
	return (-1);
	}

	if (wait && (cmd_type != POOL_INITIALIZE_START)) {
	(void) fprintf(stderr, gettext("-w cannot be used with -c or "
	"-s\n"));
	usage(B_FALSE);
	}

	poolname = argv[0];
	zhp = zpool_open(g_zfs, poolname);
	if (zhp == NULL)
	return (-1);

	vdevs = fnvlist_alloc();
	if (argc == 1) {
	/* no individual leaf vdevs specified, so add them all */
	nvlist_t *config = zpool_get_config(zhp, NULL);
	nvlist_t *nvroot = fnvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_VDEV_TREE);
	zpool_collect_leaves(zhp, nvroot, vdevs);
	} else {
	for (int i = 1; i < argc; i++) {
	fnvlist_add_boolean(vdevs, argv[i]);
	}
	}

	if (wait)
	err = zpool_initialize_wait(zhp, cmd_type, vdevs);
	else
	err = zpool_initialize(zhp, cmd_type, vdevs);

	fnvlist_free(vdevs);
	zpool_close(zhp);

	return (err);
	}

	/*
	* print a pool vdev config for dry runs
	*/
	static void
	print_vdev_tree(zpool_handle_t zhp, const char name, nvlist_t *nv, int indent,
	const char *match, int name_flags)
	{
	nvlist_t **child;
	uint_t c, children;
	char *vname;
	boolean_t printed = B_FALSE;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0) {
	if (name != NULL)
	(void) printf("\t%*s%s\n", indent, "", name);
	return;
	}

	for (c = 0; c < children; c++) {
	uint64_t is_log = B_FALSE, is_hole = B_FALSE;
	char *class = "";

	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE,
	&is_hole);

	if (is_hole == B_TRUE) {
	continue;
	}

	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
	&is_log);
	if (is_log)
	class = VDEV_ALLOC_BIAS_LOG;
	(void) nvlist_lookup_string(child[c],
	ZPOOL_CONFIG_ALLOCATION_BIAS, &class);
	if (strcmp(match, class) != 0)
	continue;

	if (!printed && name != NULL) {
	(void) printf("\t%*s%s\n", indent, "", name);
	printed = B_TRUE;
	}
	vname = zpool_vdev_name(g_zfs, zhp, child[c], name_flags);
	print_vdev_tree(zhp, vname, child[c], indent + 2, "",
	name_flags);
	free(vname);
	}
	}

	/*
	* Print the list of l2cache devices for dry runs.
	*/
	static void
	print_cache_list(nvlist_t *nv, int indent)
	{
	nvlist_t **child;
	uint_t c, children;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
	&child, &children) == 0 && children > 0) {
	(void) printf("\t%*s%s\n", indent, "", "cache");
	} else {
	return;
	}
	for (c = 0; c < children; c++) {
	char *vname;

	vname = zpool_vdev_name(g_zfs, NULL, child[c], 0);
	(void) printf("\t%*s%s\n", indent + 2, "", vname);
	free(vname);
	}
	}

	/*
	* Print the list of spares for dry runs.
	*/
	static void
	print_spare_list(nvlist_t *nv, int indent)
	{
	nvlist_t **child;
	uint_t c, children;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
	&child, &children) == 0 && children > 0) {
	(void) printf("\t%*s%s\n", indent, "", "spares");
	} else {
	return;
	}
	for (c = 0; c < children; c++) {
	char *vname;

	vname = zpool_vdev_name(g_zfs, NULL, child[c], 0);
	(void) printf("\t%*s%s\n", indent + 2, "", vname);
	free(vname);
	}
	}

	static boolean_t
	prop_list_contains_feature(nvlist_t *proplist)
	{
	nvpair_t *nvp;
	for (nvp = nvlist_next_nvpair(proplist, NULL); NULL != nvp;
	nvp = nvlist_next_nvpair(proplist, nvp)) {
	if (zpool_prop_feature(nvpair_name(nvp)))
	return (B_TRUE);
	}
	return (B_FALSE);
	}

	/*
	* Add a property pair (name, string-value) into a property nvlist.
	*/
	static int
	add_prop_list(const char propname, char propval, nvlist_t **props,
	boolean_t poolprop)
	{
	zpool_prop_t prop = ZPOOL_PROP_INVAL;
	nvlist_t *proplist;
	const char *normnm;
	char *strval;

	if (*props == NULL &&
	nvlist_alloc(props, NV_UNIQUE_NAME, 0) != 0) {
	(void) fprintf(stderr,
	gettext("internal error: out of memory\n"));
	return (1);
	}

	proplist = *props;

	if (poolprop) {
	const char *vname = zpool_prop_to_name(ZPOOL_PROP_VERSION);
	const char *cname =
	zpool_prop_to_name(ZPOOL_PROP_COMPATIBILITY);

	if ((prop = zpool_name_to_prop(propname)) == ZPOOL_PROP_INVAL &&
	!zpool_prop_feature(propname)) {
	(void) fprintf(stderr, gettext("property '%s' is "
	"not a valid pool property\n"), propname);
	return (2);
	}

	/*
	* feature@ properties and version should not be specified
	* at the same time.
	*/
	if ((prop == ZPOOL_PROP_INVAL && zpool_prop_feature(propname) &&
	nvlist_exists(proplist, vname)) \|\|
	(prop == ZPOOL_PROP_VERSION &&
	prop_list_contains_feature(proplist))) {
	(void) fprintf(stderr, gettext("'feature@' and "
	"'version' properties cannot be specified "
	"together\n"));
	return (2);
	}

	/*
	* if version is specified, only "legacy" compatibility
	* may be requested
	*/
	if ((prop == ZPOOL_PROP_COMPATIBILITY &&
	strcmp(propval, ZPOOL_COMPAT_LEGACY) != 0 &&
	nvlist_exists(proplist, vname)) \|\|
	(prop == ZPOOL_PROP_VERSION &&
	nvlist_exists(proplist, cname) &&
	strcmp(fnvlist_lookup_string(proplist, cname),
	ZPOOL_COMPAT_LEGACY) != 0)) {
	(void) fprintf(stderr, gettext("when 'version' is "
	"specified, the 'compatibility' feature may only "
	"be set to '" ZPOOL_COMPAT_LEGACY "'\n"));
	return (2);
	}

	if (zpool_prop_feature(propname))
	normnm = propname;
	else
	normnm = zpool_prop_to_name(prop);
	} else {
	zfs_prop_t fsprop = zfs_name_to_prop(propname);

	if (zfs_prop_valid_for_type(fsprop, ZFS_TYPE_FILESYSTEM,
	B_FALSE)) {
	normnm = zfs_prop_to_name(fsprop);
	} else if (zfs_prop_user(propname) \|\|
	zfs_prop_userquota(propname)) {
	normnm = propname;
	} else {
	(void) fprintf(stderr, gettext("property '%s' is "
	"not a valid filesystem property\n"), propname);
	return (2);
	}
	}

	if (nvlist_lookup_string(proplist, normnm, &strval) == 0 &&
	prop != ZPOOL_PROP_CACHEFILE) {
	(void) fprintf(stderr, gettext("property '%s' "
	"specified multiple times\n"), propname);
	return (2);
	}

	if (nvlist_add_string(proplist, normnm, propval) != 0) {
	(void) fprintf(stderr, gettext("internal "
	"error: out of memory\n"));
	return (1);
	}

	return (0);
	}

	/*
	* Set a default property pair (name, string-value) in a property nvlist
	*/
	static int
	add_prop_list_default(const char propname, char propval, nvlist_t **props,
	boolean_t poolprop)
	{
	char *pval;

	if (nvlist_lookup_string(*props, propname, &pval) == 0)
	return (0);

	return (add_prop_list(propname, propval, props, B_TRUE));
	}

	/*
	* zpool add [-fgLnP] [-o property=value] <pool> <vdev> ...
	*
	* -f Force addition of devices, even if they appear in use
	* -g Display guid for individual vdev name.
	* -L Follow links when resolving vdev path name.
	* -n Do not add the devices, but display the resulting layout if
	* they were to be added.
	* -o Set property=value.
	* -P Display full path for vdev name.
	*
	* Adds the given vdevs to 'pool'. As with create, the bulk of this work is
	* handled by make_root_vdev(), which constructs the nvlist needed to pass to
	* libzfs.
	*/
	int
	zpool_do_add(int argc, char **argv)
	{
	boolean_t force = B_FALSE;
	boolean_t dryrun = B_FALSE;
	int name_flags = 0;
	int c;
	nvlist_t *nvroot;
	char *poolname;
	int ret;
	zpool_handle_t *zhp;
	nvlist_t *config;
	nvlist_t *props = NULL;
	char *propval;

	/* check options */
	while ((c = getopt(argc, argv, "fgLno:P")) != -1) {
	switch (c) {
	case 'f':
	force = B_TRUE;
	break;
	case 'g':
	name_flags \|= VDEV_NAME_GUID;
	break;
	case 'L':
	name_flags \|= VDEV_NAME_FOLLOW_LINKS;
	break;
	case 'n':
	dryrun = B_TRUE;
	break;
	case 'o':
	if ((propval = strchr(optarg, '=')) == NULL) {
	(void) fprintf(stderr, gettext("missing "
	"'=' for -o option\n"));
	usage(B_FALSE);
	}
	*propval = '\0';
	propval++;

	if ((strcmp(optarg, ZPOOL_CONFIG_ASHIFT) != 0) \|\|
	(add_prop_list(optarg, propval, &props, B_TRUE)))
	usage(B_FALSE);
	break;
	case 'P':
	name_flags \|= VDEV_NAME_PATH;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	usage(B_FALSE);
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing vdev specification\n"));
	usage(B_FALSE);
	}

	poolname = argv[0];

	argc--;
	argv++;

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
	return (1);

	if ((config = zpool_get_config(zhp, NULL)) == NULL) {
	(void) fprintf(stderr, gettext("pool '%s' is unavailable\n"),
	poolname);
	zpool_close(zhp);
	return (1);
	}

	/* unless manually specified use "ashift" pool property (if set) */
	if (!nvlist_exists(props, ZPOOL_CONFIG_ASHIFT)) {
	int intval;
	zprop_source_t src;
	char strval[ZPOOL_MAXPROPLEN];

	intval = zpool_get_prop_int(zhp, ZPOOL_PROP_ASHIFT, &src);
	if (src != ZPROP_SRC_DEFAULT) {
	(void) sprintf(strval, "%" PRId32, intval);
	verify(add_prop_list(ZPOOL_CONFIG_ASHIFT, strval,
	&props, B_TRUE) == 0);
	}
	}

	/* pass off to make_root_vdev for processing */
	nvroot = make_root_vdev(zhp, props, force, !force, B_FALSE, dryrun,
	argc, argv);
	if (nvroot == NULL) {
	zpool_close(zhp);
	return (1);
	}

	if (dryrun) {
	nvlist_t *poolnvroot;
	nvlist_t l2child, sparechild;
	uint_t l2children, sparechildren, c;
	char *vname;
	boolean_t hadcache = B_FALSE, hadspare = B_FALSE;

	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	&poolnvroot) == 0);

	(void) printf(gettext("would update '%s' to the following "
	"configuration:\n\n"), zpool_get_name(zhp));

	/* print original main pool and new tree */
	print_vdev_tree(zhp, poolname, poolnvroot, 0, "",
	name_flags \| VDEV_NAME_TYPE_ID);
	print_vdev_tree(zhp, NULL, nvroot, 0, "", name_flags);

	/* print other classes: 'dedup', 'special', and 'log' */
	if (zfs_special_devs(poolnvroot, VDEV_ALLOC_BIAS_DEDUP)) {
	print_vdev_tree(zhp, "dedup", poolnvroot, 0,
	VDEV_ALLOC_BIAS_DEDUP, name_flags);
	print_vdev_tree(zhp, NULL, nvroot, 0,
	VDEV_ALLOC_BIAS_DEDUP, name_flags);
	} else if (zfs_special_devs(nvroot, VDEV_ALLOC_BIAS_DEDUP)) {
	print_vdev_tree(zhp, "dedup", nvroot, 0,
	VDEV_ALLOC_BIAS_DEDUP, name_flags);
	}

	if (zfs_special_devs(poolnvroot, VDEV_ALLOC_BIAS_SPECIAL)) {
	print_vdev_tree(zhp, "special", poolnvroot, 0,
	VDEV_ALLOC_BIAS_SPECIAL, name_flags);
	print_vdev_tree(zhp, NULL, nvroot, 0,
	VDEV_ALLOC_BIAS_SPECIAL, name_flags);
	} else if (zfs_special_devs(nvroot, VDEV_ALLOC_BIAS_SPECIAL)) {
	print_vdev_tree(zhp, "special", nvroot, 0,
	VDEV_ALLOC_BIAS_SPECIAL, name_flags);
	}

	if (num_logs(poolnvroot) > 0) {
	print_vdev_tree(zhp, "logs", poolnvroot, 0,
	VDEV_ALLOC_BIAS_LOG, name_flags);
	print_vdev_tree(zhp, NULL, nvroot, 0,
	VDEV_ALLOC_BIAS_LOG, name_flags);
	} else if (num_logs(nvroot) > 0) {
	print_vdev_tree(zhp, "logs", nvroot, 0,
	VDEV_ALLOC_BIAS_LOG, name_flags);
	}

	/* Do the same for the caches */
	if (nvlist_lookup_nvlist_array(poolnvroot, ZPOOL_CONFIG_L2CACHE,
	&l2child, &l2children) == 0 && l2children) {
	hadcache = B_TRUE;
	(void) printf(gettext("\tcache\n"));
	for (c = 0; c < l2children; c++) {
	vname = zpool_vdev_name(g_zfs, NULL,
	l2child[c], name_flags);
	(void) printf("\t %s\n", vname);
	free(vname);
	}
	}
	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
	&l2child, &l2children) == 0 && l2children) {
	if (!hadcache)
	(void) printf(gettext("\tcache\n"));
	for (c = 0; c < l2children; c++) {
	vname = zpool_vdev_name(g_zfs, NULL,
	l2child[c], name_flags);
	(void) printf("\t %s\n", vname);
	free(vname);
	}
	}
	/* And finally the spares */
	if (nvlist_lookup_nvlist_array(poolnvroot, ZPOOL_CONFIG_SPARES,
	&sparechild, &sparechildren) == 0 && sparechildren > 0) {
	hadspare = B_TRUE;
	(void) printf(gettext("\tspares\n"));
	for (c = 0; c < sparechildren; c++) {
	vname = zpool_vdev_name(g_zfs, NULL,
	sparechild[c], name_flags);
	(void) printf("\t %s\n", vname);
	free(vname);
	}
	}
	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
	&sparechild, &sparechildren) == 0 && sparechildren > 0) {
	if (!hadspare)
	(void) printf(gettext("\tspares\n"));
	for (c = 0; c < sparechildren; c++) {
	vname = zpool_vdev_name(g_zfs, NULL,
	sparechild[c], name_flags);
	(void) printf("\t %s\n", vname);
	free(vname);
	}
	}

	ret = 0;
	} else {
	ret = (zpool_add(zhp, nvroot) != 0);
	}

	nvlist_free(props);
	nvlist_free(nvroot);
	zpool_close(zhp);

	return (ret);
	}

	/*
	* zpool remove [-npsw] <pool> <vdev> ...
	*
	* Removes the given vdev from the pool.
	*/
	int
	zpool_do_remove(int argc, char **argv)
	{
	char *poolname;
	int i, ret = 0;
	zpool_handle_t *zhp = NULL;
	boolean_t stop = B_FALSE;
	int c;
	boolean_t noop = B_FALSE;
	boolean_t parsable = B_FALSE;
	boolean_t wait = B_FALSE;

	/* check options */
	while ((c = getopt(argc, argv, "npsw")) != -1) {
	switch (c) {
	case 'n':
	noop = B_TRUE;
	break;
	case 'p':
	parsable = B_TRUE;
	break;
	case 's':
	stop = B_TRUE;
	break;
	case 'w':
	wait = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	usage(B_FALSE);
	}

	poolname = argv[0];

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
	return (1);

	if (stop && noop) {
	(void) fprintf(stderr, gettext("stop request ignored\n"));
	return (0);
	}

	if (stop) {
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}
	if (zpool_vdev_remove_cancel(zhp) != 0)
	ret = 1;
	if (wait) {
	(void) fprintf(stderr, gettext("invalid option "
	"combination: -w cannot be used with -s\n"));
	usage(B_FALSE);
	}
	} else {
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing device\n"));
	usage(B_FALSE);
	}

	for (i = 1; i < argc; i++) {
	if (noop) {
	uint64_t size;

	if (zpool_vdev_indirect_size(zhp, argv[i],
	&size) != 0) {
	ret = 1;
	break;
	}
	if (parsable) {
	(void) printf("%s %llu\n",
	argv[i], (unsigned long long)size);
	} else {
	char valstr[32];
	zfs_nicenum(size, valstr,
	sizeof (valstr));
	(void) printf("Memory that will be "
	"used after removing %s: %s\n",
	argv[i], valstr);
	}
	} else {
	if (zpool_vdev_remove(zhp, argv[i]) != 0)
	ret = 1;
	}
	}

	if (ret == 0 && wait)
	ret = zpool_wait(zhp, ZPOOL_WAIT_REMOVE);
	}
	zpool_close(zhp);

	return (ret);
	}

	+/*
	+ * Return 1 if a vdev is active (being used in a pool)
	+ * Return 0 if a vdev is inactive (offlined or faulted, or not in active pool)
	+ *
	+ * This is useful for checking if a disk in an active pool is offlined or
	+ * faulted.
	+ */
	+static int
	+vdev_is_active(char *vdev_path)
	+{
	+ int fd;
	+ fd = open(vdev_path, O_EXCL);
	+ if (fd < 0) {
	+ return (1); /* cant open O_EXCL - disk is active */
	+ }
	+
	+ close(fd);
	+ return (0); /* disk is inactive in the pool */
	+}
	+
	/*
	* zpool labelclear [-f] <vdev>
	*
	* -f Force clearing the label for the vdevs which are members of
	* the exported or foreign pools.
	*
	* Verifies that the vdev is not active and zeros out the label information
	* on the device.
	*/
	int
	zpool_do_labelclear(int argc, char **argv)
	{
	char vdev[MAXPATHLEN];
	char *name = NULL;
	struct stat st;
	int c, fd = -1, ret = 0;
	nvlist_t *config;
	pool_state_t state;
	boolean_t inuse = B_FALSE;
	boolean_t force = B_FALSE;

	/* check options */
	while ((c = getopt(argc, argv, "f")) != -1) {
	switch (c) {
	case 'f':
	force = B_TRUE;
	break;
	default:
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* get vdev name */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing vdev name\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	/*
	* Check if we were given absolute path and use it as is.
	* Otherwise if the provided vdev name doesn't point to a file,
	* try prepending expected disk paths and partition numbers.
	*/
	(void) strlcpy(vdev, argv[0], sizeof (vdev));
	if (vdev[0] != '/' && stat(vdev, &st) != 0) {
	int error;

	error = zfs_resolve_shortname(argv[0], vdev, MAXPATHLEN);
	if (error == 0 && zfs_dev_is_whole_disk(vdev)) {
	if (zfs_append_partition(vdev, MAXPATHLEN) == -1)
	error = ENOENT;
	}

	if (error \|\| (stat(vdev, &st) != 0)) {
	(void) fprintf(stderr, gettext(
	"failed to find device %s, try specifying absolute "
	"path instead\n"), argv[0]);
	return (1);
	}
	}

	if ((fd = open(vdev, O_RDWR)) < 0) {
	(void) fprintf(stderr, gettext("failed to open %s: %s\n"),
	vdev, strerror(errno));
	return (1);
	}

	/*
	* Flush all dirty pages for the block device. This should not be
	* fatal when the device does not support BLKFLSBUF as would be the
	* case for a file vdev.
	*/
	if ((zfs_dev_flush(fd) != 0) && (errno != ENOTTY))
	(void) fprintf(stderr, gettext("failed to invalidate "
	"cache for %s: %s\n"), vdev, strerror(errno));

	if (zpool_read_label(fd, &config, NULL) != 0) {
	(void) fprintf(stderr,
	gettext("failed to read label from %s\n"), vdev);
	ret = 1;
	goto errout;
	}
	nvlist_free(config);

	ret = zpool_in_use(g_zfs, fd, &state, &name, &inuse);
	if (ret != 0) {
	(void) fprintf(stderr,
	gettext("failed to check state for %s\n"), vdev);
	ret = 1;
	goto errout;
	}

	if (!inuse)
	goto wipe_label;

	switch (state) {
	default:
	case POOL_STATE_ACTIVE:
	case POOL_STATE_SPARE:
	case POOL_STATE_L2CACHE:
	+ /*
	+ * We allow the user to call 'zpool offline -f'
	+ * on an offlined disk in an active pool. We can check if
	+ * the disk is online by calling vdev_is_active().
	+ */
	+ if (force && !vdev_is_active(vdev))
	+ break;
	+
	(void) fprintf(stderr, gettext(
	- "%s is a member (%s) of pool \"%s\"\n"),
	+ "%s is a member (%s) of pool \"%s\""),
	vdev, zpool_pool_state_to_name(state), name);
	+
	+ if (force) {
	+ (void) fprintf(stderr, gettext(
	+ ". Offline the disk first to clear its label."));
	+ }
	+ printf("\n");
	ret = 1;
	goto errout;

	case POOL_STATE_EXPORTED:
	if (force)
	break;
	(void) fprintf(stderr, gettext(
	"use '-f' to override the following error:\n"
	"%s is a member of exported pool \"%s\"\n"),
	vdev, name);
	ret = 1;
	goto errout;

	case POOL_STATE_POTENTIALLY_ACTIVE:
	if (force)
	break;
	(void) fprintf(stderr, gettext(
	"use '-f' to override the following error:\n"
	"%s is a member of potentially active pool \"%s\"\n"),
	vdev, name);
	ret = 1;
	goto errout;

	case POOL_STATE_DESTROYED:
	/* inuse should never be set for a destroyed pool */
	assert(0);
	break;
	}

	wipe_label:
	ret = zpool_clear_label(fd);
	if (ret != 0) {
	(void) fprintf(stderr,
	gettext("failed to clear label for %s\n"), vdev);
	}

	errout:
	free(name);
	(void) close(fd);

	return (ret);
	}

	/*
	* zpool create [-fnd] [-o property=value] ...
	* [-O file-system-property=value] ...
	* [-R root] [-m mountpoint] <pool> <dev> ...
	*
	* -f Force creation, even if devices appear in use
	* -n Do not create the pool, but display the resulting layout if it
	* were to be created.
	* -R Create a pool under an alternate root
	* -m Set default mountpoint for the root dataset. By default it's
	* '/<pool>'
	* -o Set property=value.
	* -o Set feature@feature=enabled\|disabled.
	* -d Don't automatically enable all supported pool features
	* (individual features can be enabled with -o).
	* -O Set fsproperty=value in the pool's root file system
	*
	* Creates the named pool according to the given vdev specification. The
	* bulk of the vdev processing is done in make_root_vdev() in zpool_vdev.c.
	* Once we get the nvlist back from make_root_vdev(), we either print out the
	* contents (if '-n' was specified), or pass it to libzfs to do the creation.
	*/
	int
	zpool_do_create(int argc, char **argv)
	{
	boolean_t force = B_FALSE;
	boolean_t dryrun = B_FALSE;
	boolean_t enable_pool_features = B_TRUE;

	int c;
	nvlist_t *nvroot = NULL;
	char *poolname;
	char *tname = NULL;
	int ret = 1;
	char *altroot = NULL;
	char *compat = NULL;
	char *mountpoint = NULL;
	nvlist_t *fsprops = NULL;
	nvlist_t *props = NULL;
	char *propval;

	/* check options */
	while ((c = getopt(argc, argv, ":fndR:m:o:O:t:")) != -1) {
	switch (c) {
	case 'f':
	force = B_TRUE;
	break;
	case 'n':
	dryrun = B_TRUE;
	break;
	case 'd':
	enable_pool_features = B_FALSE;
	break;
	case 'R':
	altroot = optarg;
	if (add_prop_list(zpool_prop_to_name(
	ZPOOL_PROP_ALTROOT), optarg, &props, B_TRUE))
	goto errout;
	if (add_prop_list_default(zpool_prop_to_name(
	ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
	goto errout;
	break;
	case 'm':
	/* Equivalent to -O mountpoint=optarg */
	mountpoint = optarg;
	break;
	case 'o':
	if ((propval = strchr(optarg, '=')) == NULL) {
	(void) fprintf(stderr, gettext("missing "
	"'=' for -o option\n"));
	goto errout;
	}
	*propval = '\0';
	propval++;

	if (add_prop_list(optarg, propval, &props, B_TRUE))
	goto errout;

	/*
	* If the user is creating a pool that doesn't support
	* feature flags, don't enable any features.
	*/
	if (zpool_name_to_prop(optarg) == ZPOOL_PROP_VERSION) {
	char *end;
	u_longlong_t ver;

	ver = strtoull(propval, &end, 10);
	if (*end == '\0' &&
	ver < SPA_VERSION_FEATURES) {
	enable_pool_features = B_FALSE;
	}
	}
	if (zpool_name_to_prop(optarg) == ZPOOL_PROP_ALTROOT)
	altroot = propval;
	if (zpool_name_to_prop(optarg) ==
	ZPOOL_PROP_COMPATIBILITY)
	compat = propval;
	break;
	case 'O':
	if ((propval = strchr(optarg, '=')) == NULL) {
	(void) fprintf(stderr, gettext("missing "
	"'=' for -O option\n"));
	goto errout;
	}
	*propval = '\0';
	propval++;

	/*
	* Mountpoints are checked and then added later.
	* Uniquely among properties, they can be specified
	* more than once, to avoid conflict with -m.
	*/
	if (0 == strcmp(optarg,
	zfs_prop_to_name(ZFS_PROP_MOUNTPOINT))) {
	mountpoint = propval;
	} else if (add_prop_list(optarg, propval, &fsprops,
	B_FALSE)) {
	goto errout;
	}
	break;
	case 't':
	/*
	* Sanity check temporary pool name.
	*/
	if (strchr(optarg, '/') != NULL) {
	(void) fprintf(stderr, gettext("cannot create "
	"'%s': invalid character '/' in temporary "
	"name\n"), optarg);
	(void) fprintf(stderr, gettext("use 'zfs "
	"create' to create a dataset\n"));
	goto errout;
	}

	if (add_prop_list(zpool_prop_to_name(
	ZPOOL_PROP_TNAME), optarg, &props, B_TRUE))
	goto errout;
	if (add_prop_list_default(zpool_prop_to_name(
	ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
	goto errout;
	tname = optarg;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	goto badusage;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	goto badusage;
	}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	goto badusage;
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing vdev specification\n"));
	goto badusage;
	}

	poolname = argv[0];

	/*
	* As a special case, check for use of '/' in the name, and direct the
	* user to use 'zfs create' instead.
	*/
	if (strchr(poolname, '/') != NULL) {
	(void) fprintf(stderr, gettext("cannot create '%s': invalid "
	"character '/' in pool name\n"), poolname);
	(void) fprintf(stderr, gettext("use 'zfs create' to "
	"create a dataset\n"));
	goto errout;
	}

	/* pass off to make_root_vdev for bulk processing */
	nvroot = make_root_vdev(NULL, props, force, !force, B_FALSE, dryrun,
	argc - 1, argv + 1);
	if (nvroot == NULL)
	goto errout;

	/* make_root_vdev() allows 0 toplevel children if there are spares */
	if (!zfs_allocatable_devs(nvroot)) {
	(void) fprintf(stderr, gettext("invalid vdev "
	"specification: at least one toplevel vdev must be "
	"specified\n"));
	goto errout;
	}

	if (altroot != NULL && altroot[0] != '/') {
	(void) fprintf(stderr, gettext("invalid alternate root '%s': "
	"must be an absolute path\n"), altroot);
	goto errout;
	}

	/*
	* Check the validity of the mountpoint and direct the user to use the
	* '-m' mountpoint option if it looks like its in use.
	*/
	if (mountpoint == NULL \|\|
	(strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) != 0 &&
	strcmp(mountpoint, ZFS_MOUNTPOINT_NONE) != 0)) {
	char buf[MAXPATHLEN];
	DIR *dirp;

	if (mountpoint && mountpoint[0] != '/') {
	(void) fprintf(stderr, gettext("invalid mountpoint "
	"'%s': must be an absolute path, 'legacy', or "
	"'none'\n"), mountpoint);
	goto errout;
	}

	if (mountpoint == NULL) {
	if (altroot != NULL)
	(void) snprintf(buf, sizeof (buf), "%s/%s",
	altroot, poolname);
	else
	(void) snprintf(buf, sizeof (buf), "/%s",
	poolname);
	} else {
	if (altroot != NULL)
	(void) snprintf(buf, sizeof (buf), "%s%s",
	altroot, mountpoint);
	else
	(void) snprintf(buf, sizeof (buf), "%s",
	mountpoint);
	}

	if ((dirp = opendir(buf)) == NULL && errno != ENOENT) {
	(void) fprintf(stderr, gettext("mountpoint '%s' : "
	"%s\n"), buf, strerror(errno));
	(void) fprintf(stderr, gettext("use '-m' "
	"option to provide a different default\n"));
	goto errout;
	} else if (dirp) {
	int count = 0;

	while (count < 3 && readdir(dirp) != NULL)
	count++;
	(void) closedir(dirp);

	if (count > 2) {
	(void) fprintf(stderr, gettext("mountpoint "
	"'%s' exists and is not empty\n"), buf);
	(void) fprintf(stderr, gettext("use '-m' "
	"option to provide a "
	"different default\n"));
	goto errout;
	}
	}
	}

	/*
	* Now that the mountpoint's validity has been checked, ensure that
	* the property is set appropriately prior to creating the pool.
	*/
	if (mountpoint != NULL) {
	ret = add_prop_list(zfs_prop_to_name(ZFS_PROP_MOUNTPOINT),
	mountpoint, &fsprops, B_FALSE);
	if (ret != 0)
	goto errout;
	}

	ret = 1;
	if (dryrun) {
	/*
	* For a dry run invocation, print out a basic message and run
	* through all the vdevs in the list and print out in an
	* appropriate hierarchy.
	*/
	(void) printf(gettext("would create '%s' with the "
	"following layout:\n\n"), poolname);

	print_vdev_tree(NULL, poolname, nvroot, 0, "", 0);
	print_vdev_tree(NULL, "dedup", nvroot, 0,
	VDEV_ALLOC_BIAS_DEDUP, 0);
	print_vdev_tree(NULL, "special", nvroot, 0,
	VDEV_ALLOC_BIAS_SPECIAL, 0);
	print_vdev_tree(NULL, "logs", nvroot, 0,
	VDEV_ALLOC_BIAS_LOG, 0);
	print_cache_list(nvroot, 0);
	print_spare_list(nvroot, 0);

	ret = 0;
	} else {
	/*
	* Load in feature set.
	* Note: if compatibility property not given, we'll have
	* NULL, which means 'all features'.
	*/
	boolean_t requested_features[SPA_FEATURES];
	if (zpool_do_load_compat(compat, requested_features) !=
	ZPOOL_COMPATIBILITY_OK)
	goto errout;

	/*
	* props contains list of features to enable.
	* For each feature:
	* - remove it if feature@name=disabled
	* - leave it there if feature@name=enabled
	* - add it if:
	* - enable_pool_features (ie: no '-d' or '-o version')
	* - it's supported by the kernel module
	* - it's in the requested feature set
	* - warn if it's enabled but not in compat
	*/
	for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
	char propname[MAXPATHLEN];
	char *propval;
	zfeature_info_t *feat = &spa_feature_table[i];

	(void) snprintf(propname, sizeof (propname),
	"feature@%s", feat->fi_uname);

	if (!nvlist_lookup_string(props, propname, &propval)) {
	if (strcmp(propval, ZFS_FEATURE_DISABLED) == 0)
	(void) nvlist_remove_all(props,
	propname);
	if (strcmp(propval,
	ZFS_FEATURE_ENABLED) == 0 &&
	!requested_features[i])
	(void) fprintf(stderr, gettext(
	"Warning: feature \"%s\" enabled "
	"but is not in specified "
	"'compatibility' feature set.\n"),
	feat->fi_uname);
	} else if (
	enable_pool_features &&
	feat->fi_zfs_mod_supported &&
	requested_features[i]) {
	ret = add_prop_list(propname,
	ZFS_FEATURE_ENABLED, &props, B_TRUE);
	if (ret != 0)
	goto errout;
	}
	}

	ret = 1;
	if (zpool_create(g_zfs, poolname,
	nvroot, props, fsprops) == 0) {
	zfs_handle_t *pool = zfs_open(g_zfs,
	tname ? tname : poolname, ZFS_TYPE_FILESYSTEM);
	if (pool != NULL) {
	if (zfs_mount(pool, NULL, 0) == 0) {
	ret = zfs_shareall(pool);
	zfs_commit_all_shares();
	}
	zfs_close(pool);
	}
	} else if (libzfs_errno(g_zfs) == EZFS_INVALIDNAME) {
	(void) fprintf(stderr, gettext("pool name may have "
	"been omitted\n"));
	}
	}

	errout:
	nvlist_free(nvroot);
	nvlist_free(fsprops);
	nvlist_free(props);
	return (ret);
	badusage:
	nvlist_free(fsprops);
	nvlist_free(props);
	usage(B_FALSE);
	return (2);
	}

	/*
	* zpool destroy <pool>
	*
	* -f Forcefully unmount any datasets
	*
	* Destroy the given pool. Automatically unmounts any datasets in the pool.
	*/
	int
	zpool_do_destroy(int argc, char **argv)
	{
	boolean_t force = B_FALSE;
	int c;
	char *pool;
	zpool_handle_t *zhp;
	int ret;

	/* check options */
	while ((c = getopt(argc, argv, "f")) != -1) {
	switch (c) {
	case 'f':
	force = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* check arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool argument\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	pool = argv[0];

	if ((zhp = zpool_open_canfail(g_zfs, pool)) == NULL) {
	/*
	* As a special case, check for use of '/' in the name, and
	* direct the user to use 'zfs destroy' instead.
	*/
	if (strchr(pool, '/') != NULL)
	(void) fprintf(stderr, gettext("use 'zfs destroy' to "
	"destroy a dataset\n"));
	return (1);
	}

	if (zpool_disable_datasets(zhp, force) != 0) {
	(void) fprintf(stderr, gettext("could not destroy '%s': "
	"could not unmount datasets\n"), zpool_get_name(zhp));
	zpool_close(zhp);
	return (1);
	}

	/* The history must be logged as part of the export */
	log_history = B_FALSE;

	ret = (zpool_destroy(zhp, history_str) != 0);

	zpool_close(zhp);

	return (ret);
	}

	typedef struct export_cbdata {
	boolean_t force;
	boolean_t hardforce;
	} export_cbdata_t;

	/*
	* Export one pool
	*/
	static int
	zpool_export_one(zpool_handle_t zhp, void data)
	{
	export_cbdata_t *cb = data;

	if (zpool_disable_datasets(zhp, cb->force) != 0)
	return (1);

	/* The history must be logged as part of the export */
	log_history = B_FALSE;

	if (cb->hardforce) {
	if (zpool_export_force(zhp, history_str) != 0)
	return (1);
	} else if (zpool_export(zhp, cb->force, history_str) != 0) {
	return (1);
	}

	return (0);
	}

	/*
	* zpool export [-f] <pool> ...
	*
	* -a Export all pools
	* -f Forcefully unmount datasets
	*
	* Export the given pools. By default, the command will attempt to cleanly
	* unmount any active datasets within the pool. If the '-f' flag is specified,
	* then the datasets will be forcefully unmounted.
	*/
	int
	zpool_do_export(int argc, char **argv)
	{
	export_cbdata_t cb;
	boolean_t do_all = B_FALSE;
	boolean_t force = B_FALSE;
	boolean_t hardforce = B_FALSE;
	int c, ret;

	/* check options */
	while ((c = getopt(argc, argv, "afF")) != -1) {
	switch (c) {
	case 'a':
	do_all = B_TRUE;
	break;
	case 'f':
	force = B_TRUE;
	break;
	case 'F':
	hardforce = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	cb.force = force;
	cb.hardforce = hardforce;
	argc -= optind;
	argv += optind;

	if (do_all) {
	if (argc != 0) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	return (for_each_pool(argc, argv, B_TRUE, NULL,
	B_FALSE, zpool_export_one, &cb));
	}

	/* check arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool argument\n"));
	usage(B_FALSE);
	}

	ret = for_each_pool(argc, argv, B_TRUE, NULL, B_FALSE, zpool_export_one,
	&cb);

	return (ret);
	}

	/*
	* Given a vdev configuration, determine the maximum width needed for the device
	* name column.
	*/
	static int
	max_width(zpool_handle_t zhp, nvlist_t nv, int depth, int max,
	int name_flags)
	{
	char *name;
	nvlist_t **child;
	uint_t c, children;
	int ret;

	name = zpool_vdev_name(g_zfs, zhp, nv, name_flags);
	if (strlen(name) + depth > max)
	max = strlen(name) + depth;

	free(name);

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
	&child, &children) == 0) {
	for (c = 0; c < children; c++)
	if ((ret = max_width(zhp, child[c], depth + 2,
	max, name_flags)) > max)
	max = ret;
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
	&child, &children) == 0) {
	for (c = 0; c < children; c++)
	if ((ret = max_width(zhp, child[c], depth + 2,
	max, name_flags)) > max)
	max = ret;
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) == 0) {
	for (c = 0; c < children; c++)
	if ((ret = max_width(zhp, child[c], depth + 2,
	max, name_flags)) > max)
	max = ret;
	}

	return (max);
	}

	typedef struct spare_cbdata {
	uint64_t cb_guid;
	zpool_handle_t *cb_zhp;
	} spare_cbdata_t;

	static boolean_t
	find_vdev(nvlist_t *nv, uint64_t search)
	{
	uint64_t guid;
	nvlist_t **child;
	uint_t c, children;

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0 &&
	search == guid)
	return (B_TRUE);

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) == 0) {
	for (c = 0; c < children; c++)
	if (find_vdev(child[c], search))
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	static int
	find_spare(zpool_handle_t zhp, void data)
	{
	spare_cbdata_t *cbp = data;
	nvlist_t config, nvroot;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	&nvroot) == 0);

	if (find_vdev(nvroot, cbp->cb_guid)) {
	cbp->cb_zhp = zhp;
	return (1);
	}

	zpool_close(zhp);
	return (0);
	}

	typedef struct status_cbdata {
	int cb_count;
	int cb_name_flags;
	int cb_namewidth;
	boolean_t cb_allpools;
	boolean_t cb_verbose;
	boolean_t cb_literal;
	boolean_t cb_explain;
	boolean_t cb_first;
	boolean_t cb_dedup_stats;
	boolean_t cb_print_status;
	boolean_t cb_print_slow_ios;
	boolean_t cb_print_vdev_init;
	boolean_t cb_print_vdev_trim;
	vdev_cmd_data_list_t *vcdl;
	} status_cbdata_t;

	/* Return 1 if string is NULL, empty, or whitespace; return 0 otherwise. */
	static int
	is_blank_str(char *str)
	{
	while (str != NULL && *str != '\0') {
	if (!isblank(*str))
	return (0);
	str++;
	}
	return (1);
	}

	/* Print command output lines for specific vdev in a specific pool */
	static void
	zpool_print_cmd(vdev_cmd_data_list_t vcdl, const char pool, char *path)
	{
	vdev_cmd_data_t *data;
	int i, j;
	char *val;

	for (i = 0; i < vcdl->count; i++) {
	if ((strcmp(vcdl->data[i].path, path) != 0) \|\|
	(strcmp(vcdl->data[i].pool, pool) != 0)) {
	/* Not the vdev we're looking for */
	continue;
	}

	data = &vcdl->data[i];
	/* Print out all the output values for this vdev */
	for (j = 0; j < vcdl->uniq_cols_cnt; j++) {
	val = NULL;
	/* Does this vdev have values for this column? */
	for (int k = 0; k < data->cols_cnt; k++) {
	if (strcmp(data->cols[k],
	vcdl->uniq_cols[j]) == 0) {
	/* yes it does, record the value */
	val = data->lines[k];
	break;
	}
	}
	/*
	* Mark empty values with dashes to make output
	* awk-able.
	*/
	if (val == NULL \|\| is_blank_str(val))
	val = "-";

	printf("%*s", vcdl->uniq_cols_width[j], val);
	if (j < vcdl->uniq_cols_cnt - 1)
	printf(" ");
	}

	/* Print out any values that aren't in a column at the end */
	for (j = data->cols_cnt; j < data->lines_cnt; j++) {
	/* Did we have any columns? If so print a spacer. */
	if (vcdl->uniq_cols_cnt > 0)
	printf(" ");

	val = data->lines[j];
	printf("%s", val ? val : "");
	}
	break;
	}
	}

	/*
	* Print vdev initialization status for leaves
	*/
	static void
	print_status_initialize(vdev_stat_t *vs, boolean_t verbose)
	{
	if (verbose) {
	if ((vs->vs_initialize_state == VDEV_INITIALIZE_ACTIVE \|\|
	vs->vs_initialize_state == VDEV_INITIALIZE_SUSPENDED \|\|
	vs->vs_initialize_state == VDEV_INITIALIZE_COMPLETE) &&
	!vs->vs_scan_removing) {
	char zbuf[1024];
	char tbuf[256];
	struct tm zaction_ts;

	time_t t = vs->vs_initialize_action_time;
	int initialize_pct = 100;
	if (vs->vs_initialize_state !=
	VDEV_INITIALIZE_COMPLETE) {
	initialize_pct = (vs->vs_initialize_bytes_done *
	100 / (vs->vs_initialize_bytes_est + 1));
	}

	(void) localtime_r(&t, &zaction_ts);
	(void) strftime(tbuf, sizeof (tbuf), "%c", &zaction_ts);

	switch (vs->vs_initialize_state) {
	case VDEV_INITIALIZE_SUSPENDED:
	(void) snprintf(zbuf, sizeof (zbuf), ", %s %s",
	gettext("suspended, started at"), tbuf);
	break;
	case VDEV_INITIALIZE_ACTIVE:
	(void) snprintf(zbuf, sizeof (zbuf), ", %s %s",
	gettext("started at"), tbuf);
	break;
	case VDEV_INITIALIZE_COMPLETE:
	(void) snprintf(zbuf, sizeof (zbuf), ", %s %s",
	gettext("completed at"), tbuf);
	break;
	}

	(void) printf(gettext(" (%d%% initialized%s)"),
	initialize_pct, zbuf);
	} else {
	(void) printf(gettext(" (uninitialized)"));
	}
	} else if (vs->vs_initialize_state == VDEV_INITIALIZE_ACTIVE) {
	(void) printf(gettext(" (initializing)"));
	}
	}

	/*
	* Print vdev TRIM status for leaves
	*/
	static void
	print_status_trim(vdev_stat_t *vs, boolean_t verbose)
	{
	if (verbose) {
	if ((vs->vs_trim_state == VDEV_TRIM_ACTIVE \|\|
	vs->vs_trim_state == VDEV_TRIM_SUSPENDED \|\|
	vs->vs_trim_state == VDEV_TRIM_COMPLETE) &&
	!vs->vs_scan_removing) {
	char zbuf[1024];
	char tbuf[256];
	struct tm zaction_ts;

	time_t t = vs->vs_trim_action_time;
	int trim_pct = 100;
	if (vs->vs_trim_state != VDEV_TRIM_COMPLETE) {
	trim_pct = (vs->vs_trim_bytes_done *
	100 / (vs->vs_trim_bytes_est + 1));
	}

	(void) localtime_r(&t, &zaction_ts);
	(void) strftime(tbuf, sizeof (tbuf), "%c", &zaction_ts);

	switch (vs->vs_trim_state) {
	case VDEV_TRIM_SUSPENDED:
	(void) snprintf(zbuf, sizeof (zbuf), ", %s %s",
	gettext("suspended, started at"), tbuf);
	break;
	case VDEV_TRIM_ACTIVE:
	(void) snprintf(zbuf, sizeof (zbuf), ", %s %s",
	gettext("started at"), tbuf);
	break;
	case VDEV_TRIM_COMPLETE:
	(void) snprintf(zbuf, sizeof (zbuf), ", %s %s",
	gettext("completed at"), tbuf);
	break;
	}

	(void) printf(gettext(" (%d%% trimmed%s)"),
	trim_pct, zbuf);
	} else if (vs->vs_trim_notsup) {
	(void) printf(gettext(" (trim unsupported)"));
	} else {
	(void) printf(gettext(" (untrimmed)"));
	}
	} else if (vs->vs_trim_state == VDEV_TRIM_ACTIVE) {
	(void) printf(gettext(" (trimming)"));
	}
	}

	/*
	* Return the color associated with a health string. This includes returning
	* NULL for no color change.
	*/
	static char *
	health_str_to_color(const char *health)
	{
	if (strcmp(health, gettext("FAULTED")) == 0 \|\|
	strcmp(health, gettext("SUSPENDED")) == 0 \|\|
	strcmp(health, gettext("UNAVAIL")) == 0) {
	return (ANSI_RED);
	}

	if (strcmp(health, gettext("OFFLINE")) == 0 \|\|
	strcmp(health, gettext("DEGRADED")) == 0 \|\|
	strcmp(health, gettext("REMOVED")) == 0) {
	return (ANSI_YELLOW);
	}

	return (NULL);
	}

	/*
	* Print out configuration state as requested by status_callback.
	*/
	static void
	print_status_config(zpool_handle_t zhp, status_cbdata_t cb, const char *name,
	nvlist_t nv, int depth, boolean_t isspare, vdev_rebuild_stat_t vrs)
	{
	nvlist_t *child, root;
	uint_t c, i, vsc, children;
	pool_scan_stat_t *ps = NULL;
	vdev_stat_t *vs;
	char rbuf[6], wbuf[6], cbuf[6];
	char *vname;
	uint64_t notpresent;
	spare_cbdata_t spare_cb;
	const char *state;
	char *type;
	char *path = NULL;
	char rcolor = NULL, wcolor = NULL, *ccolor = NULL;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	children = 0;

	verify(nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &vsc) == 0);

	verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);

	if (strcmp(type, VDEV_TYPE_INDIRECT) == 0)
	return;

	state = zpool_state_to_name(vs->vs_state, vs->vs_aux);

	if (isspare) {
	/*
	* For hot spares, we use the terms 'INUSE' and 'AVAILABLE' for
	* online drives.
	*/
	if (vs->vs_aux == VDEV_AUX_SPARED)
	state = gettext("INUSE");
	else if (vs->vs_state == VDEV_STATE_HEALTHY)
	state = gettext("AVAIL");
	}

	printf_color(health_str_to_color(state),
	"\t%s%-s %-8s", depth, "", cb->cb_namewidth - depth,
	name, state);

	if (!isspare) {
	if (vs->vs_read_errors)
	rcolor = ANSI_RED;

	if (vs->vs_write_errors)
	wcolor = ANSI_RED;

	if (vs->vs_checksum_errors)
	ccolor = ANSI_RED;

	if (cb->cb_literal) {
	printf(" ");
	printf_color(rcolor, "%5llu",
	(u_longlong_t)vs->vs_read_errors);
	printf(" ");
	printf_color(wcolor, "%5llu",
	(u_longlong_t)vs->vs_write_errors);
	printf(" ");
	printf_color(ccolor, "%5llu",
	(u_longlong_t)vs->vs_checksum_errors);
	} else {
	zfs_nicenum(vs->vs_read_errors, rbuf, sizeof (rbuf));
	zfs_nicenum(vs->vs_write_errors, wbuf, sizeof (wbuf));
	zfs_nicenum(vs->vs_checksum_errors, cbuf,
	sizeof (cbuf));
	printf(" ");
	printf_color(rcolor, "%5s", rbuf);
	printf(" ");
	printf_color(wcolor, "%5s", wbuf);
	printf(" ");
	printf_color(ccolor, "%5s", cbuf);
	}
	if (cb->cb_print_slow_ios) {
	if (children == 0) {
	/* Only leafs vdevs have slow IOs */
	zfs_nicenum(vs->vs_slow_ios, rbuf,
	sizeof (rbuf));
	} else {
	snprintf(rbuf, sizeof (rbuf), "-");
	}

	if (cb->cb_literal)
	printf(" %5llu", (u_longlong_t)vs->vs_slow_ios);
	else
	printf(" %5s", rbuf);
	}
	}

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
	&notpresent) == 0) {
	verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
	(void) printf(" %s %s", gettext("was"), path);
	} else if (vs->vs_aux != 0) {
	(void) printf(" ");
	color_start(ANSI_RED);
	switch (vs->vs_aux) {
	case VDEV_AUX_OPEN_FAILED:
	(void) printf(gettext("cannot open"));
	break;

	case VDEV_AUX_BAD_GUID_SUM:
	(void) printf(gettext("missing device"));
	break;

	case VDEV_AUX_NO_REPLICAS:
	(void) printf(gettext("insufficient replicas"));
	break;

	case VDEV_AUX_VERSION_NEWER:
	(void) printf(gettext("newer version"));
	break;

	case VDEV_AUX_UNSUP_FEAT:
	(void) printf(gettext("unsupported feature(s)"));
	break;

	case VDEV_AUX_ASHIFT_TOO_BIG:
	(void) printf(gettext("unsupported minimum blocksize"));
	break;

	case VDEV_AUX_SPARED:
	verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID,
	&spare_cb.cb_guid) == 0);
	if (zpool_iter(g_zfs, find_spare, &spare_cb) == 1) {
	if (strcmp(zpool_get_name(spare_cb.cb_zhp),
	zpool_get_name(zhp)) == 0)
	(void) printf(gettext("currently in "
	"use"));
	else
	(void) printf(gettext("in use by "
	"pool '%s'"),
	zpool_get_name(spare_cb.cb_zhp));
	zpool_close(spare_cb.cb_zhp);
	} else {
	(void) printf(gettext("currently in use"));
	}
	break;

	case VDEV_AUX_ERR_EXCEEDED:
	(void) printf(gettext("too many errors"));
	break;

	case VDEV_AUX_IO_FAILURE:
	(void) printf(gettext("experienced I/O failures"));
	break;

	case VDEV_AUX_BAD_LOG:
	(void) printf(gettext("bad intent log"));
	break;

	case VDEV_AUX_EXTERNAL:
	(void) printf(gettext("external device fault"));
	break;

	case VDEV_AUX_SPLIT_POOL:
	(void) printf(gettext("split into new pool"));
	break;

	case VDEV_AUX_ACTIVE:
	(void) printf(gettext("currently in use"));
	break;

	case VDEV_AUX_CHILDREN_OFFLINE:
	(void) printf(gettext("all children offline"));
	break;

	case VDEV_AUX_BAD_LABEL:
	(void) printf(gettext("invalid label"));
	break;

	default:
	(void) printf(gettext("corrupted data"));
	break;
	}
	color_end();
	} else if (children == 0 && !isspare &&
	getenv("ZPOOL_STATUS_NON_NATIVE_ASHIFT_IGNORE") == NULL &&
	VDEV_STAT_VALID(vs_physical_ashift, vsc) &&
	vs->vs_configured_ashift < vs->vs_physical_ashift) {
	(void) printf(
	gettext(" block size: %dB configured, %dB native"),
	1 << vs->vs_configured_ashift, 1 << vs->vs_physical_ashift);
	}

	/* The root vdev has the scrub/resilver stats */
	root = fnvlist_lookup_nvlist(zpool_get_config(zhp, NULL),
	ZPOOL_CONFIG_VDEV_TREE);
	(void) nvlist_lookup_uint64_array(root, ZPOOL_CONFIG_SCAN_STATS,
	(uint64_t **)&ps, &c);

	if (ps != NULL && ps->pss_state == DSS_SCANNING && children == 0) {
	if (vs->vs_scan_processed != 0) {
	(void) printf(gettext(" (%s)"),
	(ps->pss_func == POOL_SCAN_RESILVER) ?
	"resilvering" : "repairing");
	} else if (vs->vs_resilver_deferred) {
	(void) printf(gettext(" (awaiting resilver)"));
	}
	}

	/* The top-level vdevs have the rebuild stats */
	if (vrs != NULL && vrs->vrs_state == VDEV_REBUILD_ACTIVE &&
	children == 0) {
	if (vs->vs_rebuild_processed != 0) {
	(void) printf(gettext(" (resilvering)"));
	}
	}

	if (cb->vcdl != NULL) {
	if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0) {
	printf(" ");
	zpool_print_cmd(cb->vcdl, zpool_get_name(zhp), path);
	}
	}

	/* Display vdev initialization and trim status for leaves. */
	if (children == 0) {
	print_status_initialize(vs, cb->cb_print_vdev_init);
	print_status_trim(vs, cb->cb_print_vdev_trim);
	}

	(void) printf("\n");

	for (c = 0; c < children; c++) {
	uint64_t islog = B_FALSE, ishole = B_FALSE;

	/* Don't print logs or holes here */
	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
	&islog);
	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE,
	&ishole);
	if (islog \|\| ishole)
	continue;
	/* Only print normal classes here */
	if (nvlist_exists(child[c], ZPOOL_CONFIG_ALLOCATION_BIAS))
	continue;

	/* Provide vdev_rebuild_stats to children if available */
	if (vrs == NULL) {
	(void) nvlist_lookup_uint64_array(nv,
	ZPOOL_CONFIG_REBUILD_STATS,
	(uint64_t **)&vrs, &i);
	}

	vname = zpool_vdev_name(g_zfs, zhp, child[c],
	cb->cb_name_flags \| VDEV_NAME_TYPE_ID);
	print_status_config(zhp, cb, vname, child[c], depth + 2,
	isspare, vrs);
	free(vname);
	}
	}

	/*
	* Print the configuration of an exported pool. Iterate over all vdevs in the
	* pool, printing out the name and status for each one.
	*/
	static void
	print_import_config(status_cbdata_t cb, const char name, nvlist_t *nv,
	int depth)
	{
	nvlist_t **child;
	uint_t c, children;
	vdev_stat_t *vs;
	char type, vname;

	verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
	if (strcmp(type, VDEV_TYPE_MISSING) == 0 \|\|
	strcmp(type, VDEV_TYPE_HOLE) == 0)
	return;

	verify(nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &c) == 0);

	(void) printf("\t%s%-s", depth, "", cb->cb_namewidth - depth, name);
	(void) printf(" %s", zpool_state_to_name(vs->vs_state, vs->vs_aux));

	if (vs->vs_aux != 0) {
	(void) printf(" ");

	switch (vs->vs_aux) {
	case VDEV_AUX_OPEN_FAILED:
	(void) printf(gettext("cannot open"));
	break;

	case VDEV_AUX_BAD_GUID_SUM:
	(void) printf(gettext("missing device"));
	break;

	case VDEV_AUX_NO_REPLICAS:
	(void) printf(gettext("insufficient replicas"));
	break;

	case VDEV_AUX_VERSION_NEWER:
	(void) printf(gettext("newer version"));
	break;

	case VDEV_AUX_UNSUP_FEAT:
	(void) printf(gettext("unsupported feature(s)"));
	break;

	case VDEV_AUX_ERR_EXCEEDED:
	(void) printf(gettext("too many errors"));
	break;

	case VDEV_AUX_ACTIVE:
	(void) printf(gettext("currently in use"));
	break;

	case VDEV_AUX_CHILDREN_OFFLINE:
	(void) printf(gettext("all children offline"));
	break;

	case VDEV_AUX_BAD_LABEL:
	(void) printf(gettext("invalid label"));
	break;

	default:
	(void) printf(gettext("corrupted data"));
	break;
	}
	}
	(void) printf("\n");

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	return;

	for (c = 0; c < children; c++) {
	uint64_t is_log = B_FALSE;

	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
	&is_log);
	if (is_log)
	continue;
	if (nvlist_exists(child[c], ZPOOL_CONFIG_ALLOCATION_BIAS))
	continue;

	vname = zpool_vdev_name(g_zfs, NULL, child[c],
	cb->cb_name_flags \| VDEV_NAME_TYPE_ID);
	print_import_config(cb, vname, child[c], depth + 2);
	free(vname);
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
	&child, &children) == 0) {
	(void) printf(gettext("\tcache\n"));
	for (c = 0; c < children; c++) {
	vname = zpool_vdev_name(g_zfs, NULL, child[c],
	cb->cb_name_flags);
	(void) printf("\t %s\n", vname);
	free(vname);
	}
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
	&child, &children) == 0) {
	(void) printf(gettext("\tspares\n"));
	for (c = 0; c < children; c++) {
	vname = zpool_vdev_name(g_zfs, NULL, child[c],
	cb->cb_name_flags);
	(void) printf("\t %s\n", vname);
	free(vname);
	}
	}
	}

	/*
	* Print specialized class vdevs.
	*
	* These are recorded as top level vdevs in the main pool child array
	* but with "is_log" set to 1 or an "alloc_bias" string. We use either
	* print_status_config() or print_import_config() to print the top level
	* class vdevs then any of their children (eg mirrored slogs) are printed
	* recursively - which works because only the top level vdev is marked.
	*/
	static void
	print_class_vdevs(zpool_handle_t zhp, status_cbdata_t cb, nvlist_t *nv,
	const char *class)
	{
	uint_t c, children;
	nvlist_t **child;
	boolean_t printed = B_FALSE;

	assert(zhp != NULL \|\| !cb->cb_verbose);

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, &child,
	&children) != 0)
	return;

	for (c = 0; c < children; c++) {
	uint64_t is_log = B_FALSE;
	char *bias = NULL;
	char *type = NULL;

	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
	&is_log);

	if (is_log) {
	bias = VDEV_ALLOC_CLASS_LOGS;
	} else {
	(void) nvlist_lookup_string(child[c],
	ZPOOL_CONFIG_ALLOCATION_BIAS, &bias);
	(void) nvlist_lookup_string(child[c],
	ZPOOL_CONFIG_TYPE, &type);
	}

	if (bias == NULL \|\| strcmp(bias, class) != 0)
	continue;
	if (!is_log && strcmp(type, VDEV_TYPE_INDIRECT) == 0)
	continue;

	if (!printed) {
	(void) printf("\t%s\t\n", gettext(class));
	printed = B_TRUE;
	}

	char *name = zpool_vdev_name(g_zfs, zhp, child[c],
	cb->cb_name_flags \| VDEV_NAME_TYPE_ID);
	if (cb->cb_print_status)
	print_status_config(zhp, cb, name, child[c], 2,
	B_FALSE, NULL);
	else
	print_import_config(cb, name, child[c], 2);
	free(name);
	}
	}

	/*
	* Display the status for the given pool.
	*/
	static int
	show_import(nvlist_t *config, boolean_t report_error)
	{
	uint64_t pool_state;
	vdev_stat_t *vs;
	char *name;
	uint64_t guid;
	uint64_t hostid = 0;
	char *msgid;
	char *hostname = "unknown";
	nvlist_t nvroot, nvinfo;
	zpool_status_t reason;
	zpool_errata_t errata;
	const char *health;
	uint_t vsc;
	char *comment;
	status_cbdata_t cb = { 0 };

	verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
	&name) == 0);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	&guid) == 0);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
	&pool_state) == 0);
	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	&nvroot) == 0);

	verify(nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &vsc) == 0);
	health = zpool_state_to_name(vs->vs_state, vs->vs_aux);

	reason = zpool_import_status(config, &msgid, &errata);

	/*
	* If we're importing using a cachefile, then we won't report any
	* errors unless we are in the scan phase of the import.
	*/
	if (reason != ZPOOL_STATUS_OK && !report_error)
	return (reason);

	(void) printf(gettext(" pool: %s\n"), name);
	(void) printf(gettext(" id: %llu\n"), (u_longlong_t)guid);
	(void) printf(gettext(" state: %s"), health);
	if (pool_state == POOL_STATE_DESTROYED)
	(void) printf(gettext(" (DESTROYED)"));
	(void) printf("\n");

	switch (reason) {
	case ZPOOL_STATUS_MISSING_DEV_R:
	case ZPOOL_STATUS_MISSING_DEV_NR:
	case ZPOOL_STATUS_BAD_GUID_SUM:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices are "
	"missing from the system.\n"));
	break;

	case ZPOOL_STATUS_CORRUPT_LABEL_R:
	case ZPOOL_STATUS_CORRUPT_LABEL_NR:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices contains"
	" corrupted data.\n"));
	break;

	case ZPOOL_STATUS_CORRUPT_DATA:
	(void) printf(
	gettext(" status: The pool data is corrupted.\n"));
	break;

	case ZPOOL_STATUS_OFFLINE_DEV:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices "
	"are offlined.\n"));
	break;

	case ZPOOL_STATUS_CORRUPT_POOL:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool metadata is "
	"corrupted.\n"));
	break;

	case ZPOOL_STATUS_VERSION_OLDER:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool is formatted using "
	"a legacy on-disk version.\n"));
	break;

	case ZPOOL_STATUS_VERSION_NEWER:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool is formatted using "
	"an incompatible version.\n"));
	break;

	case ZPOOL_STATUS_FEAT_DISABLED:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("Some supported "
	"features are not enabled on the pool.\n\t"
	"(Note that they may be intentionally disabled "
	"if the\n\t'compatibility' property is set.)\n"));
	break;

	case ZPOOL_STATUS_COMPATIBILITY_ERR:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("Error reading or parsing "
	"the file(s) indicated by the 'compatibility'\n"
	"property.\n"));
	break;

	case ZPOOL_STATUS_INCOMPATIBLE_FEAT:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more features "
	"are enabled on the pool despite not being\n"
	"requested by the 'compatibility' property.\n"));
	break;

	case ZPOOL_STATUS_UNSUP_FEAT_READ:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool uses the following "
	"feature(s) not supported on this system:\n"));
	color_start(ANSI_YELLOW);
	zpool_print_unsup_feat(config);
	color_end();
	break;

	case ZPOOL_STATUS_UNSUP_FEAT_WRITE:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool can only be "
	"accessed in read-only mode on this system. It\n\tcannot be"
	" accessed in read-write mode because it uses the "
	"following\n\tfeature(s) not supported on this system:\n"));
	color_start(ANSI_YELLOW);
	zpool_print_unsup_feat(config);
	color_end();
	break;

	case ZPOOL_STATUS_HOSTID_ACTIVE:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool is currently "
	"imported by another system.\n"));
	break;

	case ZPOOL_STATUS_HOSTID_REQUIRED:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool has the "
	"multihost property on. It cannot\n\tbe safely imported "
	"when the system hostid is not set.\n"));
	break;

	case ZPOOL_STATUS_HOSTID_MISMATCH:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool was last accessed "
	"by another system.\n"));
	break;

	case ZPOOL_STATUS_FAULTED_DEV_R:
	case ZPOOL_STATUS_FAULTED_DEV_NR:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices are "
	"faulted.\n"));
	break;

	case ZPOOL_STATUS_BAD_LOG:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("An intent log record cannot "
	"be read.\n"));
	break;

	case ZPOOL_STATUS_RESILVERING:
	case ZPOOL_STATUS_REBUILDING:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices were "
	"being resilvered.\n"));
	break;

	case ZPOOL_STATUS_ERRATA:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("Errata #%d detected.\n"),
	errata);
	break;

	case ZPOOL_STATUS_NON_NATIVE_ASHIFT:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices are "
	"configured to use a non-native block size.\n"
	"\tExpect reduced performance.\n"));
	break;

	default:
	/*
	* No other status can be seen when importing pools.
	*/
	assert(reason == ZPOOL_STATUS_OK);
	}

	/*
	* Print out an action according to the overall state of the pool.
	*/
	if (vs->vs_state == VDEV_STATE_HEALTHY) {
	if (reason == ZPOOL_STATUS_VERSION_OLDER \|\|
	reason == ZPOOL_STATUS_FEAT_DISABLED) {
	(void) printf(gettext(" action: The pool can be "
	"imported using its name or numeric identifier, "
	"though\n\tsome features will not be available "
	"without an explicit 'zpool upgrade'.\n"));
	} else if (reason == ZPOOL_STATUS_COMPATIBILITY_ERR) {
	(void) printf(gettext(" action: The pool can be "
	"imported using its name or numeric\n\tidentifier, "
	"though the file(s) indicated by its "
	"'compatibility'\n\tproperty cannot be parsed at "
	"this time.\n"));
	} else if (reason == ZPOOL_STATUS_HOSTID_MISMATCH) {
	(void) printf(gettext(" action: The pool can be "
	"imported using its name or numeric "
	"identifier and\n\tthe '-f' flag.\n"));
	} else if (reason == ZPOOL_STATUS_ERRATA) {
	switch (errata) {
	case ZPOOL_ERRATA_NONE:
	break;

	case ZPOOL_ERRATA_ZOL_2094_SCRUB:
	(void) printf(gettext(" action: The pool can "
	"be imported using its name or numeric "
	"identifier,\n\thowever there is a compat"
	"ibility issue which should be corrected"
	"\n\tby running 'zpool scrub'\n"));
	break;

	case ZPOOL_ERRATA_ZOL_2094_ASYNC_DESTROY:
	(void) printf(gettext(" action: The pool can"
	"not be imported with this version of ZFS "
	"due to\n\tan active asynchronous destroy. "
	"Revert to an earlier version\n\tand "
	"allow the destroy to complete before "
	"updating.\n"));
	break;

	case ZPOOL_ERRATA_ZOL_6845_ENCRYPTION:
	(void) printf(gettext(" action: Existing "
	"encrypted datasets contain an on-disk "
	"incompatibility, which\n\tneeds to be "
	"corrected. Backup these datasets to new "
	"encrypted datasets\n\tand destroy the "
	"old ones.\n"));
	break;

	case ZPOOL_ERRATA_ZOL_8308_ENCRYPTION:
	(void) printf(gettext(" action: Existing "
	"encrypted snapshots and bookmarks contain "
	"an on-disk\n\tincompatibility. This may "
	"cause on-disk corruption if they are used"
	"\n\twith 'zfs recv'. To correct the "
	"issue, enable the bookmark_v2 feature.\n\t"
	"No additional action is needed if there "
	"are no encrypted snapshots or\n\t"
	"bookmarks. If preserving the encrypted "
	"snapshots and bookmarks is\n\trequired, "
	"use a non-raw send to backup and restore "
	"them. Alternately,\n\tthey may be removed"
	" to resolve the incompatibility.\n"));
	break;
	default:
	/*
	* All errata must contain an action message.
	*/
	assert(0);
	}
	} else {
	(void) printf(gettext(" action: The pool can be "
	"imported using its name or numeric "
	"identifier.\n"));
	}
	} else if (vs->vs_state == VDEV_STATE_DEGRADED) {
	(void) printf(gettext(" action: The pool can be imported "
	"despite missing or damaged devices. The\n\tfault "
	"tolerance of the pool may be compromised if imported.\n"));
	} else {
	switch (reason) {
	case ZPOOL_STATUS_VERSION_NEWER:
	(void) printf(gettext(" action: The pool cannot be "
	"imported. Access the pool on a system running "
	"newer\n\tsoftware, or recreate the pool from "
	"backup.\n"));
	break;
	case ZPOOL_STATUS_UNSUP_FEAT_READ:
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("The pool cannot be "
	"imported. Access the pool on a system that "
	"supports\n\tthe required feature(s), or recreate "
	"the pool from backup.\n"));
	break;
	case ZPOOL_STATUS_UNSUP_FEAT_WRITE:
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("The pool cannot be "
	"imported in read-write mode. Import the pool "
	"with\n"
	"\t\"-o readonly=on\", access the pool on a system "
	"that supports the\n\trequired feature(s), or "
	"recreate the pool from backup.\n"));
	break;
	case ZPOOL_STATUS_MISSING_DEV_R:
	case ZPOOL_STATUS_MISSING_DEV_NR:
	case ZPOOL_STATUS_BAD_GUID_SUM:
	(void) printf(gettext(" action: The pool cannot be "
	"imported. Attach the missing\n\tdevices and try "
	"again.\n"));
	break;
	case ZPOOL_STATUS_HOSTID_ACTIVE:
	VERIFY0(nvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_LOAD_INFO, &nvinfo));

	if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_HOSTNAME))
	hostname = fnvlist_lookup_string(nvinfo,
	ZPOOL_CONFIG_MMP_HOSTNAME);

	if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_HOSTID))
	hostid = fnvlist_lookup_uint64(nvinfo,
	ZPOOL_CONFIG_MMP_HOSTID);

	(void) printf(gettext(" action: The pool must be "
	"exported from %s (hostid=%lx)\n\tbefore it "
	"can be safely imported.\n"), hostname,
	(unsigned long) hostid);
	break;
	case ZPOOL_STATUS_HOSTID_REQUIRED:
	(void) printf(gettext(" action: Set a unique system "
	"hostid with the zgenhostid(8) command.\n"));
	break;
	default:
	(void) printf(gettext(" action: The pool cannot be "
	"imported due to damaged devices or data.\n"));
	}
	}

	/* Print the comment attached to the pool. */
	if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0)
	(void) printf(gettext("comment: %s\n"), comment);

	/*
	* If the state is "closed" or "can't open", and the aux state
	* is "corrupt data":
	*/
	if (((vs->vs_state == VDEV_STATE_CLOSED) \|\|
	(vs->vs_state == VDEV_STATE_CANT_OPEN)) &&
	(vs->vs_aux == VDEV_AUX_CORRUPT_DATA)) {
	if (pool_state == POOL_STATE_DESTROYED)
	(void) printf(gettext("\tThe pool was destroyed, "
	"but can be imported using the '-Df' flags.\n"));
	else if (pool_state != POOL_STATE_EXPORTED)
	(void) printf(gettext("\tThe pool may be active on "
	"another system, but can be imported using\n\t"
	"the '-f' flag.\n"));
	}

	if (msgid != NULL) {
	(void) printf(gettext(
	" see: https://openzfs.github.io/openzfs-docs/msg/%s\n"),
	msgid);
	}

	(void) printf(gettext(" config:\n\n"));

	cb.cb_namewidth = max_width(NULL, nvroot, 0, strlen(name),
	VDEV_NAME_TYPE_ID);
	if (cb.cb_namewidth < 10)
	cb.cb_namewidth = 10;

	print_import_config(&cb, name, nvroot, 0);

	print_class_vdevs(NULL, &cb, nvroot, VDEV_ALLOC_BIAS_DEDUP);
	print_class_vdevs(NULL, &cb, nvroot, VDEV_ALLOC_BIAS_SPECIAL);
	print_class_vdevs(NULL, &cb, nvroot, VDEV_ALLOC_CLASS_LOGS);

	if (reason == ZPOOL_STATUS_BAD_GUID_SUM) {
	(void) printf(gettext("\n\tAdditional devices are known to "
	"be part of this pool, though their\n\texact "
	"configuration cannot be determined.\n"));
	}
	return (0);
	}

	static boolean_t
	zfs_force_import_required(nvlist_t *config)
	{
	uint64_t state;
	uint64_t hostid = 0;
	nvlist_t *nvinfo;

	state = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE);
	(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID, &hostid);

	if (state != POOL_STATE_EXPORTED && hostid != get_system_hostid())
	return (B_TRUE);

	nvinfo = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO);
	if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_STATE)) {
	mmp_state_t mmp_state = fnvlist_lookup_uint64(nvinfo,
	ZPOOL_CONFIG_MMP_STATE);

	if (mmp_state != MMP_STATE_INACTIVE)
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	/*
	* Perform the import for the given configuration. This passes the heavy
	* lifting off to zpool_import_props(), and then mounts the datasets contained
	* within the pool.
	*/
	static int
	do_import(nvlist_t config, const char newname, const char *mntopts,
	nvlist_t *props, int flags)
	{
	int ret = 0;
	zpool_handle_t *zhp;
	char *name;
	uint64_t version;

	name = fnvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME);
	version = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION);

	if (!SPA_VERSION_IS_SUPPORTED(version)) {
	(void) fprintf(stderr, gettext("cannot import '%s': pool "
	"is formatted using an unsupported ZFS version\n"), name);
	return (1);
	} else if (zfs_force_import_required(config) &&
	!(flags & ZFS_IMPORT_ANY_HOST)) {
	mmp_state_t mmp_state = MMP_STATE_INACTIVE;
	nvlist_t *nvinfo;

	nvinfo = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO);
	if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_STATE))
	mmp_state = fnvlist_lookup_uint64(nvinfo,
	ZPOOL_CONFIG_MMP_STATE);

	if (mmp_state == MMP_STATE_ACTIVE) {
	char *hostname = "<unknown>";
	uint64_t hostid = 0;

	if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_HOSTNAME))
	hostname = fnvlist_lookup_string(nvinfo,
	ZPOOL_CONFIG_MMP_HOSTNAME);

	if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_HOSTID))
	hostid = fnvlist_lookup_uint64(nvinfo,
	ZPOOL_CONFIG_MMP_HOSTID);

	(void) fprintf(stderr, gettext("cannot import '%s': "
	"pool is imported on %s (hostid: "
	"0x%lx)\nExport the pool on the other system, "
	"then run 'zpool import'.\n"),
	name, hostname, (unsigned long) hostid);
	} else if (mmp_state == MMP_STATE_NO_HOSTID) {
	(void) fprintf(stderr, gettext("Cannot import '%s': "
	"pool has the multihost property on and the\n"
	"system's hostid is not set. Set a unique hostid "
	"with the zgenhostid(8) command.\n"), name);
	} else {
	char *hostname = "<unknown>";
	uint64_t timestamp = 0;
	uint64_t hostid = 0;

	if (nvlist_exists(config, ZPOOL_CONFIG_HOSTNAME))
	hostname = fnvlist_lookup_string(config,
	ZPOOL_CONFIG_HOSTNAME);

	if (nvlist_exists(config, ZPOOL_CONFIG_TIMESTAMP))
	timestamp = fnvlist_lookup_uint64(config,
	ZPOOL_CONFIG_TIMESTAMP);

	if (nvlist_exists(config, ZPOOL_CONFIG_HOSTID))
	hostid = fnvlist_lookup_uint64(config,
	ZPOOL_CONFIG_HOSTID);

	(void) fprintf(stderr, gettext("cannot import '%s': "
	"pool was previously in use from another system.\n"
	"Last accessed by %s (hostid=%lx) at %s"
	"The pool can be imported, use 'zpool import -f' "
	"to import the pool.\n"), name, hostname,
	(unsigned long)hostid, ctime((time_t *)&timestamp));
	}

	return (1);
	}

	if (zpool_import_props(g_zfs, config, newname, props, flags) != 0)
	return (1);

	if (newname != NULL)
	name = (char *)newname;

	if ((zhp = zpool_open_canfail(g_zfs, name)) == NULL)
	return (1);

	/*
	* Loading keys is best effort. We don't want to return immediately
	* if it fails but we do want to give the error to the caller.
	*/
	if (flags & ZFS_IMPORT_LOAD_KEYS) {
	ret = zfs_crypto_attempt_load_keys(g_zfs, name);
	if (ret != 0)
	ret = 1;
	}

	if (zpool_get_state(zhp) != POOL_STATE_UNAVAIL &&
	!(flags & ZFS_IMPORT_ONLY) &&
	zpool_enable_datasets(zhp, mntopts, 0) != 0) {
	zpool_close(zhp);
	return (1);
	}

	zpool_close(zhp);
	return (ret);
	}

	static int
	import_pools(nvlist_t pools, nvlist_t props, char *mntopts, int flags,
	char orig_name, char new_name,
	boolean_t do_destroyed, boolean_t pool_specified, boolean_t do_all,
	importargs_t *import)
	{
	nvlist_t *config = NULL;
	nvlist_t *found_config = NULL;
	uint64_t pool_state;

	/*
	* At this point we have a list of import candidate configs. Even if
	* we were searching by pool name or guid, we still need to
	* post-process the list to deal with pool state and possible
	* duplicate names.
	*/
	int err = 0;
	nvpair_t *elem = NULL;
	boolean_t first = B_TRUE;
	while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {

	verify(nvpair_value_nvlist(elem, &config) == 0);

	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
	&pool_state) == 0);
	if (!do_destroyed && pool_state == POOL_STATE_DESTROYED)
	continue;
	if (do_destroyed && pool_state != POOL_STATE_DESTROYED)
	continue;

	verify(nvlist_add_nvlist(config, ZPOOL_LOAD_POLICY,
	import->policy) == 0);

	if (!pool_specified) {
	if (first)
	first = B_FALSE;
	else if (!do_all)
	(void) printf("\n");

	if (do_all) {
	err \|= do_import(config, NULL, mntopts,
	props, flags);
	} else {
	/*
	* If we're importing from cachefile, then
	* we don't want to report errors until we
	* are in the scan phase of the import. If
	* we get an error, then we return that error
	* to invoke the scan phase.
	*/
	if (import->cachefile && !import->scan)
	err = show_import(config, B_FALSE);
	else
	(void) show_import(config, B_TRUE);
	}
	} else if (import->poolname != NULL) {
	char *name;

	/*
	* We are searching for a pool based on name.
	*/
	verify(nvlist_lookup_string(config,
	ZPOOL_CONFIG_POOL_NAME, &name) == 0);

	if (strcmp(name, import->poolname) == 0) {
	if (found_config != NULL) {
	(void) fprintf(stderr, gettext(
	"cannot import '%s': more than "
	"one matching pool\n"),
	import->poolname);
	(void) fprintf(stderr, gettext(
	"import by numeric ID instead\n"));
	err = B_TRUE;
	}
	found_config = config;
	}
	} else {
	uint64_t guid;

	/*
	* Search for a pool by guid.
	*/
	verify(nvlist_lookup_uint64(config,
	ZPOOL_CONFIG_POOL_GUID, &guid) == 0);

	if (guid == import->guid)
	found_config = config;
	}
	}

	/*
	* If we were searching for a specific pool, verify that we found a
	* pool, and then do the import.
	*/
	if (pool_specified && err == 0) {
	if (found_config == NULL) {
	(void) fprintf(stderr, gettext("cannot import '%s': "
	"no such pool available\n"), orig_name);
	err = B_TRUE;
	} else {
	err \|= do_import(found_config, new_name,
	mntopts, props, flags);
	}
	}

	/*
	* If we were just looking for pools, report an error if none were
	* found.
	*/
	if (!pool_specified && first)
	(void) fprintf(stderr,
	gettext("no pools available to import\n"));
	return (err);
	}

	typedef struct target_exists_args {
	const char *poolname;
	uint64_t poolguid;
	} target_exists_args_t;

	static int
	name_or_guid_exists(zpool_handle_t zhp, void data)
	{
	target_exists_args_t *args = data;
	nvlist_t *config = zpool_get_config(zhp, NULL);
	int found = 0;

	if (config == NULL)
	return (0);

	if (args->poolname != NULL) {
	char *pool_name;

	verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
	&pool_name) == 0);
	if (strcmp(pool_name, args->poolname) == 0)
	found = 1;
	} else {
	uint64_t pool_guid;

	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	&pool_guid) == 0);
	if (pool_guid == args->poolguid)
	found = 1;
	}
	zpool_close(zhp);

	return (found);
	}
	/*
	* zpool checkpoint <pool>
	* checkpoint --discard <pool>
	*
	* -d Discard the checkpoint from a checkpointed
	* --discard pool.
	*
	* -w Wait for discarding a checkpoint to complete.
	* --wait
	*
	* Checkpoints the specified pool, by taking a "snapshot" of its
	* current state. A pool can only have one checkpoint at a time.
	*/
	int
	zpool_do_checkpoint(int argc, char **argv)
	{
	boolean_t discard, wait;
	char *pool;
	zpool_handle_t *zhp;
	int c, err;

	struct option long_options[] = {
	{"discard", no_argument, NULL, 'd'},
	{"wait", no_argument, NULL, 'w'},
	{0, 0, 0, 0}
	};

	discard = B_FALSE;
	wait = B_FALSE;
	while ((c = getopt_long(argc, argv, ":dw", long_options, NULL)) != -1) {
	switch (c) {
	case 'd':
	discard = B_TRUE;
	break;
	case 'w':
	wait = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	if (wait && !discard) {
	(void) fprintf(stderr, gettext("--wait only valid when "
	"--discard also specified\n"));
	usage(B_FALSE);
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool argument\n"));
	usage(B_FALSE);
	}

	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	pool = argv[0];

	if ((zhp = zpool_open(g_zfs, pool)) == NULL) {
	/* As a special case, check for use of '/' in the name */
	if (strchr(pool, '/') != NULL)
	(void) fprintf(stderr, gettext("'zpool checkpoint' "
	"doesn't work on datasets. To save the state "
	"of a dataset from a specific point in time "
	"please use 'zfs snapshot'\n"));
	return (1);
	}

	if (discard) {
	err = (zpool_discard_checkpoint(zhp) != 0);
	if (err == 0 && wait)
	err = zpool_wait(zhp, ZPOOL_WAIT_CKPT_DISCARD);
	} else {
	err = (zpool_checkpoint(zhp) != 0);
	}

	zpool_close(zhp);

	return (err);
	}

	#define CHECKPOINT_OPT 1024

	/*
	* zpool import [-d dir] [-D]
	* import [-o mntopts] [-o prop=value] ... [-R root] [-D] [-l]
	* [-d dir \| -c cachefile \| -s] [-f] -a
	* import [-o mntopts] [-o prop=value] ... [-R root] [-D] [-l]
	* [-d dir \| -c cachefile \| -s] [-f] [-n] [-F] <pool \| id>
	* [newpool]
	*
	* -c Read pool information from a cachefile instead of searching
	* devices. If importing from a cachefile config fails, then
	* fallback to searching for devices only in the directories that
	* exist in the cachefile.
	*
	* -d Scan in a specific directory, other than /dev/. More than
	* one directory can be specified using multiple '-d' options.
	*
	* -D Scan for previously destroyed pools or import all or only
	* specified destroyed pools.
	*
	* -R Temporarily import the pool, with all mountpoints relative to
	* the given root. The pool will remain exported when the machine
	* is rebooted.
	*
	* -V Import even in the presence of faulted vdevs. This is an
	* intentionally undocumented option for testing purposes, and
	* treats the pool configuration as complete, leaving any bad
	* vdevs in the FAULTED state. In other words, it does verbatim
	* import.
	*
	* -f Force import, even if it appears that the pool is active.
	*
	* -F Attempt rewind if necessary.
	*
	* -n See if rewind would work, but don't actually rewind.
	*
	* -N Import the pool but don't mount datasets.
	*
	* -T Specify a starting txg to use for import. This option is
	* intentionally undocumented option for testing purposes.
	*
	* -a Import all pools found.
	*
	* -l Load encryption keys while importing.
	*
	* -o Set property=value and/or temporary mount options (without '=').
	*
	* -s Scan using the default search path, the libblkid cache will
	* not be consulted.
	*
	* --rewind-to-checkpoint
	* Import the pool and revert back to the checkpoint.
	*
	* The import command scans for pools to import, and import pools based on pool
	* name and GUID. The pool can also be renamed as part of the import process.
	*/
	int
	zpool_do_import(int argc, char **argv)
	{
	char **searchdirs = NULL;
	char env, envdup = NULL;
	int nsearch = 0;
	int c;
	int err = 0;
	nvlist_t *pools = NULL;
	boolean_t do_all = B_FALSE;
	boolean_t do_destroyed = B_FALSE;
	char *mntopts = NULL;
	uint64_t searchguid = 0;
	char *searchname = NULL;
	char *propval;
	nvlist_t *policy = NULL;
	nvlist_t *props = NULL;
	int flags = ZFS_IMPORT_NORMAL;
	uint32_t rewind_policy = ZPOOL_NO_REWIND;
	boolean_t dryrun = B_FALSE;
	boolean_t do_rewind = B_FALSE;
	boolean_t xtreme_rewind = B_FALSE;
	boolean_t do_scan = B_FALSE;
	boolean_t pool_exists = B_FALSE;
	boolean_t pool_specified = B_FALSE;
	uint64_t txg = -1ULL;
	char *cachefile = NULL;
	importargs_t idata = { 0 };
	char *endptr;

	struct option long_options[] = {
	{"rewind-to-checkpoint", no_argument, NULL, CHECKPOINT_OPT},
	{0, 0, 0, 0}
	};

	/* check options */
	while ((c = getopt_long(argc, argv, ":aCc:d:DEfFlmnNo:R:stT:VX",
	long_options, NULL)) != -1) {
	switch (c) {
	case 'a':
	do_all = B_TRUE;
	break;
	case 'c':
	cachefile = optarg;
	break;
	case 'd':
	if (searchdirs == NULL) {
	searchdirs = safe_malloc(sizeof (char *));
	} else {
	char *tmp = safe_malloc((nsearch + 1)
	sizeof (char *));
	bcopy(searchdirs, tmp, nsearch *
	sizeof (char *));
	free(searchdirs);
	searchdirs = tmp;
	}
	searchdirs[nsearch++] = optarg;
	break;
	case 'D':
	do_destroyed = B_TRUE;
	break;
	case 'f':
	flags \|= ZFS_IMPORT_ANY_HOST;
	break;
	case 'F':
	do_rewind = B_TRUE;
	break;
	case 'l':
	flags \|= ZFS_IMPORT_LOAD_KEYS;
	break;
	case 'm':
	flags \|= ZFS_IMPORT_MISSING_LOG;
	break;
	case 'n':
	dryrun = B_TRUE;
	break;
	case 'N':
	flags \|= ZFS_IMPORT_ONLY;
	break;
	case 'o':
	if ((propval = strchr(optarg, '=')) != NULL) {
	*propval = '\0';
	propval++;
	if (add_prop_list(optarg, propval,
	&props, B_TRUE))
	goto error;
	} else {
	mntopts = optarg;
	}
	break;
	case 'R':
	if (add_prop_list(zpool_prop_to_name(
	ZPOOL_PROP_ALTROOT), optarg, &props, B_TRUE))
	goto error;
	if (add_prop_list_default(zpool_prop_to_name(
	ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
	goto error;
	break;
	case 's':
	do_scan = B_TRUE;
	break;
	case 't':
	flags \|= ZFS_IMPORT_TEMP_NAME;
	if (add_prop_list_default(zpool_prop_to_name(
	ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
	goto error;
	break;

	case 'T':
	errno = 0;
	txg = strtoull(optarg, &endptr, 0);
	if (errno != 0 \|\| *endptr != '\0') {
	(void) fprintf(stderr,
	gettext("invalid txg value\n"));
	usage(B_FALSE);
	}
	rewind_policy = ZPOOL_DO_REWIND \| ZPOOL_EXTREME_REWIND;
	break;
	case 'V':
	flags \|= ZFS_IMPORT_VERBATIM;
	break;
	case 'X':
	xtreme_rewind = B_TRUE;
	break;
	case CHECKPOINT_OPT:
	flags \|= ZFS_IMPORT_CHECKPOINT;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (cachefile && nsearch != 0) {
	(void) fprintf(stderr, gettext("-c is incompatible with -d\n"));
	usage(B_FALSE);
	}

	if (cachefile && do_scan) {
	(void) fprintf(stderr, gettext("-c is incompatible with -s\n"));
	usage(B_FALSE);
	}

	if ((flags & ZFS_IMPORT_LOAD_KEYS) && (flags & ZFS_IMPORT_ONLY)) {
	(void) fprintf(stderr, gettext("-l is incompatible with -N\n"));
	usage(B_FALSE);
	}

	if ((flags & ZFS_IMPORT_LOAD_KEYS) && !do_all && argc == 0) {
	(void) fprintf(stderr, gettext("-l is only meaningful during "
	"an import\n"));
	usage(B_FALSE);
	}

	if ((dryrun \|\| xtreme_rewind) && !do_rewind) {
	(void) fprintf(stderr,
	gettext("-n or -X only meaningful with -F\n"));
	usage(B_FALSE);
	}
	if (dryrun)
	rewind_policy = ZPOOL_TRY_REWIND;
	else if (do_rewind)
	rewind_policy = ZPOOL_DO_REWIND;
	if (xtreme_rewind)
	rewind_policy \|= ZPOOL_EXTREME_REWIND;

	/* In the future, we can capture further policy and include it here */
	if (nvlist_alloc(&policy, NV_UNIQUE_NAME, 0) != 0 \|\|
	nvlist_add_uint64(policy, ZPOOL_LOAD_REQUEST_TXG, txg) != 0 \|\|
	nvlist_add_uint32(policy, ZPOOL_LOAD_REWIND_POLICY,
	rewind_policy) != 0)
	goto error;

	/* check argument count */
	if (do_all) {
	if (argc != 0) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}
	} else {
	if (argc > 2) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}
	}

	/*
	* Check for the effective uid. We do this explicitly here because
	* otherwise any attempt to discover pools will silently fail.
	*/
	if (argc == 0 && geteuid() != 0) {
	(void) fprintf(stderr, gettext("cannot "
	"discover pools: permission denied\n"));
	if (searchdirs != NULL)
	free(searchdirs);

	nvlist_free(props);
	nvlist_free(policy);
	return (1);
	}

	/*
	* Depending on the arguments given, we do one of the following:
	*
	* <none> Iterate through all pools and display information about
	* each one.
	*
	* -a Iterate through all pools and try to import each one.
	*
	* <id> Find the pool that corresponds to the given GUID/pool
	* name and import that one.
	*
	* -D Above options applies only to destroyed pools.
	*/
	if (argc != 0) {
	char *endptr;

	errno = 0;
	searchguid = strtoull(argv[0], &endptr, 10);
	if (errno != 0 \|\| *endptr != '\0') {
	searchname = argv[0];
	searchguid = 0;
	}
	pool_specified = B_TRUE;

	/*
	* User specified a name or guid. Ensure it's unique.
	*/
	target_exists_args_t search = {searchname, searchguid};
	pool_exists = zpool_iter(g_zfs, name_or_guid_exists, &search);
	}

	/*
	* Check the environment for the preferred search path.
	*/
	if ((searchdirs == NULL) && (env = getenv("ZPOOL_IMPORT_PATH"))) {
	char *dir;

	envdup = strdup(env);

	dir = strtok(envdup, ":");
	while (dir != NULL) {
	if (searchdirs == NULL) {
	searchdirs = safe_malloc(sizeof (char *));
	} else {
	char *tmp = safe_malloc((nsearch + 1)
	sizeof (char *));
	bcopy(searchdirs, tmp, nsearch *
	sizeof (char *));
	free(searchdirs);
	searchdirs = tmp;
	}
	searchdirs[nsearch++] = dir;
	dir = strtok(NULL, ":");
	}
	}

	idata.path = searchdirs;
	idata.paths = nsearch;
	idata.poolname = searchname;
	idata.guid = searchguid;
	idata.cachefile = cachefile;
	idata.scan = do_scan;
	idata.policy = policy;

	pools = zpool_search_import(g_zfs, &idata, &libzfs_config_ops);

	if (pools != NULL && pool_exists &&
	(argc == 1 \|\| strcmp(argv[0], argv[1]) == 0)) {
	(void) fprintf(stderr, gettext("cannot import '%s': "
	"a pool with that name already exists\n"),
	argv[0]);
	(void) fprintf(stderr, gettext("use the form '%s "
	"<pool \| id> <newpool>' to give it a new name\n"),
	"zpool import");
	err = 1;
	} else if (pools == NULL && pool_exists) {
	(void) fprintf(stderr, gettext("cannot import '%s': "
	"a pool with that name is already created/imported,\n"),
	argv[0]);
	(void) fprintf(stderr, gettext("and no additional pools "
	"with that name were found\n"));
	err = 1;
	} else if (pools == NULL) {
	if (argc != 0) {
	(void) fprintf(stderr, gettext("cannot import '%s': "
	"no such pool available\n"), argv[0]);
	}
	err = 1;
	}

	if (err == 1) {
	if (searchdirs != NULL)
	free(searchdirs);
	if (envdup != NULL)
	free(envdup);
	nvlist_free(policy);
	nvlist_free(pools);
	nvlist_free(props);
	return (1);
	}

	- err = import_pools(pools, props, mntopts, flags, argv[0],
	- argc == 1 ? NULL : argv[1], do_destroyed, pool_specified,
	- do_all, &idata);
	+ err = import_pools(pools, props, mntopts, flags,
	+ argc >= 1 ? argv[0] : NULL,
	+ argc >= 2 ? argv[1] : NULL,
	+ do_destroyed, pool_specified, do_all, &idata);

	/*
	* If we're using the cachefile and we failed to import, then
	* fallback to scanning the directory for pools that match
	* those in the cachefile.
	*/
	if (err != 0 && cachefile != NULL) {
	(void) printf(gettext("cachefile import failed, retrying\n"));

	/*
	* We use the scan flag to gather the directories that exist
	* in the cachefile. If we need to fallback to searching for
	* the pool config, we will only search devices in these
	* directories.
	*/
	idata.scan = B_TRUE;
	nvlist_free(pools);
	pools = zpool_search_import(g_zfs, &idata, &libzfs_config_ops);

	- err = import_pools(pools, props, mntopts, flags, argv[0],
	- argc == 1 ? NULL : argv[1], do_destroyed, pool_specified,
	- do_all, &idata);
	+ err = import_pools(pools, props, mntopts, flags,
	+ argc >= 1 ? argv[0] : NULL,
	+ argc >= 2 ? argv[1] : NULL,
	+ do_destroyed, pool_specified, do_all, &idata);
	}

	error:
	nvlist_free(props);
	nvlist_free(pools);
	nvlist_free(policy);
	if (searchdirs != NULL)
	free(searchdirs);
	if (envdup != NULL)
	free(envdup);

	return (err ? 1 : 0);
	}

	/*
	* zpool sync [-f] [pool] ...
	*
	* -f (undocumented) force uberblock (and config including zpool cache file)
	* update.
	*
	* Sync the specified pool(s).
	* Without arguments "zpool sync" will sync all pools.
	* This command initiates TXG sync(s) and will return after the TXG(s) commit.
	*
	*/
	static int
	zpool_do_sync(int argc, char **argv)
	{
	int ret;
	boolean_t force = B_FALSE;

	/* check options */
	while ((ret = getopt(argc, argv, "f")) != -1) {
	switch (ret) {
	case 'f':
	force = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* if argc == 0 we will execute zpool_sync_one on all pools */
	ret = for_each_pool(argc, argv, B_FALSE, NULL, B_FALSE, zpool_sync_one,
	&force);

	return (ret);
	}

	typedef struct iostat_cbdata {
	uint64_t cb_flags;
	int cb_name_flags;
	int cb_namewidth;
	int cb_iteration;
	char *cb_vdev_names; / Only show these vdevs */
	unsigned int cb_vdev_names_count;
	boolean_t cb_verbose;
	boolean_t cb_literal;
	boolean_t cb_scripted;
	zpool_list_t *cb_list;
	vdev_cmd_data_list_t *vcdl;
	} iostat_cbdata_t;

	/* iostat labels */
	typedef struct name_and_columns {
	const char name; / Column name */
	unsigned int columns; /* Center name to this number of columns */
	} name_and_columns_t;

	#define IOSTAT_MAX_LABELS 13 /* Max number of labels on one line */

	static const name_and_columns_t iostat_top_labels[][IOSTAT_MAX_LABELS] =
	{
	[IOS_DEFAULT] = {{"capacity", 2}, {"operations", 2}, {"bandwidth", 2},
	{NULL}},
	[IOS_LATENCY] = {{"total_wait", 2}, {"disk_wait", 2}, {"syncq_wait", 2},
	{"asyncq_wait", 2}, {"scrub", 1}, {"trim", 1}, {NULL}},
	[IOS_QUEUES] = {{"syncq_read", 2}, {"syncq_write", 2},
	{"asyncq_read", 2}, {"asyncq_write", 2}, {"scrubq_read", 2},
	{"trimq_write", 2}, {NULL}},
	[IOS_L_HISTO] = {{"total_wait", 2}, {"disk_wait", 2}, {"syncq_wait", 2},
	{"asyncq_wait", 2}, {NULL}},
	[IOS_RQ_HISTO] = {{"sync_read", 2}, {"sync_write", 2},
	{"async_read", 2}, {"async_write", 2}, {"scrub", 2},
	{"trim", 2}, {NULL}},
	};

	/* Shorthand - if "columns" field not set, default to 1 column */
	static const name_and_columns_t iostat_bottom_labels[][IOSTAT_MAX_LABELS] =
	{
	[IOS_DEFAULT] = {{"alloc"}, {"free"}, {"read"}, {"write"}, {"read"},
	{"write"}, {NULL}},
	[IOS_LATENCY] = {{"read"}, {"write"}, {"read"}, {"write"}, {"read"},
	{"write"}, {"read"}, {"write"}, {"wait"}, {"wait"}, {NULL}},
	[IOS_QUEUES] = {{"pend"}, {"activ"}, {"pend"}, {"activ"}, {"pend"},
	{"activ"}, {"pend"}, {"activ"}, {"pend"}, {"activ"},
	{"pend"}, {"activ"}, {NULL}},
	[IOS_L_HISTO] = {{"read"}, {"write"}, {"read"}, {"write"}, {"read"},
	{"write"}, {"read"}, {"write"}, {"scrub"}, {"trim"}, {NULL}},
	[IOS_RQ_HISTO] = {{"ind"}, {"agg"}, {"ind"}, {"agg"}, {"ind"}, {"agg"},
	{"ind"}, {"agg"}, {"ind"}, {"agg"}, {"ind"}, {"agg"}, {NULL}},
	};

	static const char *histo_to_title[] = {
	[IOS_L_HISTO] = "latency",
	[IOS_RQ_HISTO] = "req_size",
	};

	/*
	* Return the number of labels in a null-terminated name_and_columns_t
	* array.
	*
	*/
	static unsigned int
	label_array_len(const name_and_columns_t *labels)
	{
	int i = 0;

	while (labels[i].name)
	i++;

	return (i);
	}

	/*
	* Return the number of strings in a null-terminated string array.
	* For example:
	*
	* const char foo[] = {"bar", "baz", NULL}
	*
	* returns 2
	*/
	static uint64_t
	str_array_len(const char *array[])
	{
	uint64_t i = 0;
	while (array[i])
	i++;

	return (i);
	}


	/*
	* Return a default column width for default/latency/queue columns. This does
	* not include histograms, which have their columns autosized.
	*/
	static unsigned int
	default_column_width(iostat_cbdata_t *cb, enum iostat_type type)
	{
	unsigned long column_width = 5; /* Normal niceprint */
	static unsigned long widths[] = {
	/*
	* Choose some sane default column sizes for printing the
	* raw numbers.
	*/
	[IOS_DEFAULT] = 15, /* 1PB capacity */
	[IOS_LATENCY] = 10, /* 1B ns = 10sec */
	[IOS_QUEUES] = 6, /* 1M queue entries */
	[IOS_L_HISTO] = 10, /* 1B ns = 10sec */
	[IOS_RQ_HISTO] = 6, /* 1M queue entries */
	};

	if (cb->cb_literal)
	column_width = widths[type];

	return (column_width);
	}

	/*
	* Print the column labels, i.e:
	*
	* capacity operations bandwidth
	* alloc free read write read write ...
	*
	* If force_column_width is set, use it for the column width. If not set, use
	* the default column width.
	*/
	static void
	print_iostat_labels(iostat_cbdata_t *cb, unsigned int force_column_width,
	const name_and_columns_t labels[][IOSTAT_MAX_LABELS])
	{
	int i, idx, s;
	int text_start, rw_column_width, spaces_to_end;
	uint64_t flags = cb->cb_flags;
	uint64_t f;
	unsigned int column_width = force_column_width;

	/* For each bit set in flags */
	for (f = flags; f; f &= ~(1ULL << idx)) {
	idx = lowbit64(f) - 1;
	if (!force_column_width)
	column_width = default_column_width(cb, idx);
	/* Print our top labels centered over "read write" label. */
	for (i = 0; i < label_array_len(labels[idx]); i++) {
	const char *name = labels[idx][i].name;
	/*
	* We treat labels[][].columns == 0 as shorthand
	* for one column. It makes writing out the label
	* tables more concise.
	*/
	unsigned int columns = MAX(1, labels[idx][i].columns);
	unsigned int slen = strlen(name);

	rw_column_width = (column_width * columns) +
	(2 * (columns - 1));

	text_start = (int)((rw_column_width) / columns -
	slen / columns);
	if (text_start < 0)
	text_start = 0;

	printf(" "); /* Two spaces between columns */

	/* Space from beginning of column to label */
	for (s = 0; s < text_start; s++)
	printf(" ");

	printf("%s", name);

	/* Print space after label to end of column */
	spaces_to_end = rw_column_width - text_start - slen;
	if (spaces_to_end < 0)
	spaces_to_end = 0;

	for (s = 0; s < spaces_to_end; s++)
	printf(" ");
	}
	}
	}


	/*
	* print_cmd_columns - Print custom column titles from -c
	*
	* If the user specified the "zpool status\|iostat -c" then print their custom
	* column titles in the header. For example, print_cmd_columns() would print
	* the " col1 col2" part of this:
	*
	* $ zpool iostat -vc 'echo col1=val1; echo col2=val2'
	* ...
	* capacity operations bandwidth
	* pool alloc free read write read write col1 col2
	* ---------- ----- ----- ----- ----- ----- ----- ---- ----
	* mypool 269K 1008M 0 0 107 946
	* mirror 269K 1008M 0 0 107 946
	* sdb - - 0 0 102 473 val1 val2
	* sdc - - 0 0 5 473 val1 val2
	* ---------- ----- ----- ----- ----- ----- ----- ---- ----
	*/
	static void
	print_cmd_columns(vdev_cmd_data_list_t *vcdl, int use_dashes)
	{
	int i, j;
	vdev_cmd_data_t *data = &vcdl->data[0];

	if (vcdl->count == 0 \|\| data == NULL)
	return;

	/*
	* Each vdev cmd should have the same column names unless the user did
	* something weird with their cmd. Just take the column names from the
	* first vdev and assume it works for all of them.
	*/
	for (i = 0; i < vcdl->uniq_cols_cnt; i++) {
	printf(" ");
	if (use_dashes) {
	for (j = 0; j < vcdl->uniq_cols_width[i]; j++)
	printf("-");
	} else {
	printf_color(ANSI_BOLD, "%*s", vcdl->uniq_cols_width[i],
	vcdl->uniq_cols[i]);
	}
	}
	}


	/*
	* Utility function to print out a line of dashes like:
	*
	* -------------------------------- ----- ----- ----- ----- -----
	*
	* ...or a dashed named-row line like:
	*
	* logs - - - - -
	*
	* @cb: iostat data
	*
	* @force_column_width If non-zero, use the value as the column width.
	* Otherwise use the default column widths.
	*
	* @name: Print a dashed named-row line starting
	* with @name. Otherwise, print a regular
	* dashed line.
	*/
	static void
	print_iostat_dashes(iostat_cbdata_t *cb, unsigned int force_column_width,
	const char *name)
	{
	int i;
	unsigned int namewidth;
	uint64_t flags = cb->cb_flags;
	uint64_t f;
	int idx;
	const name_and_columns_t *labels;
	const char *title;


	if (cb->cb_flags & IOS_ANYHISTO_M) {
	title = histo_to_title[IOS_HISTO_IDX(cb->cb_flags)];
	} else if (cb->cb_vdev_names_count) {
	title = "vdev";
	} else {
	title = "pool";
	}

	namewidth = MAX(MAX(strlen(title), cb->cb_namewidth),
	name ? strlen(name) : 0);


	if (name) {
	printf("%-*s", namewidth, name);
	} else {
	for (i = 0; i < namewidth; i++)
	(void) printf("-");
	}

	/* For each bit in flags */
	for (f = flags; f; f &= ~(1ULL << idx)) {
	unsigned int column_width;
	idx = lowbit64(f) - 1;
	if (force_column_width)
	column_width = force_column_width;
	else
	column_width = default_column_width(cb, idx);

	labels = iostat_bottom_labels[idx];
	for (i = 0; i < label_array_len(labels); i++) {
	if (name)
	printf(" %*s-", column_width - 1, " ");
	else
	printf(" %.*s", column_width,
	"--------------------");
	}
	}
	}


	static void
	print_iostat_separator_impl(iostat_cbdata_t *cb,
	unsigned int force_column_width)
	{
	print_iostat_dashes(cb, force_column_width, NULL);
	}

	static void
	print_iostat_separator(iostat_cbdata_t *cb)
	{
	print_iostat_separator_impl(cb, 0);
	}

	static void
	print_iostat_header_impl(iostat_cbdata_t *cb, unsigned int force_column_width,
	const char *histo_vdev_name)
	{
	unsigned int namewidth;
	const char *title;

	if (cb->cb_flags & IOS_ANYHISTO_M) {
	title = histo_to_title[IOS_HISTO_IDX(cb->cb_flags)];
	} else if (cb->cb_vdev_names_count) {
	title = "vdev";
	} else {
	title = "pool";
	}

	namewidth = MAX(MAX(strlen(title), cb->cb_namewidth),
	histo_vdev_name ? strlen(histo_vdev_name) : 0);

	if (histo_vdev_name)
	printf("%-*s", namewidth, histo_vdev_name);
	else
	printf("%*s", namewidth, "");


	print_iostat_labels(cb, force_column_width, iostat_top_labels);
	printf("\n");

	printf("%-*s", namewidth, title);

	print_iostat_labels(cb, force_column_width, iostat_bottom_labels);
	if (cb->vcdl != NULL)
	print_cmd_columns(cb->vcdl, 0);

	printf("\n");

	print_iostat_separator_impl(cb, force_column_width);

	if (cb->vcdl != NULL)
	print_cmd_columns(cb->vcdl, 1);

	printf("\n");
	}

	static void
	print_iostat_header(iostat_cbdata_t *cb)
	{
	print_iostat_header_impl(cb, 0, NULL);
	}


	/*
	* Display a single statistic.
	*/
	static void
	print_one_stat(uint64_t value, enum zfs_nicenum_format format,
	unsigned int column_size, boolean_t scripted)
	{
	char buf[64];

	zfs_nicenum_format(value, buf, sizeof (buf), format);

	if (scripted)
	printf("\t%s", buf);
	else
	printf(" %*s", column_size, buf);
	}

	/*
	* Calculate the default vdev stats
	*
	* Subtract oldvs from newvs, apply a scaling factor, and save the resulting
	* stats into calcvs.
	*/
	static void
	calc_default_iostats(vdev_stat_t oldvs, vdev_stat_t newvs,
	vdev_stat_t *calcvs)
	{
	int i;

	memcpy(calcvs, newvs, sizeof (*calcvs));
	for (i = 0; i < ARRAY_SIZE(calcvs->vs_ops); i++)
	calcvs->vs_ops[i] = (newvs->vs_ops[i] - oldvs->vs_ops[i]);

	for (i = 0; i < ARRAY_SIZE(calcvs->vs_bytes); i++)
	calcvs->vs_bytes[i] = (newvs->vs_bytes[i] - oldvs->vs_bytes[i]);
	}

	/*
	* Internal representation of the extended iostats data.
	*
	* The extended iostat stats are exported in nvlists as either uint64_t arrays
	* or single uint64_t's. We make both look like arrays to make them easier
	* to process. In order to make single uint64_t's look like arrays, we set
	* __data to the stat data, and then set *data = &__data with count = 1. Then,
	* we can just use *data and count.
	*/
	struct stat_array {
	uint64_t *data;
	uint_t count; /* Number of entries in data[] */
	uint64_t __data; /* Only used when data is a single uint64_t */
	};

	static uint64_t
	stat_histo_max(struct stat_array *nva, unsigned int len)
	{
	uint64_t max = 0;
	int i;
	for (i = 0; i < len; i++)
	max = MAX(max, array64_max(nva[i].data, nva[i].count));

	return (max);
	}

	/*
	* Helper function to lookup a uint64_t array or uint64_t value and store its
	* data as a stat_array. If the nvpair is a single uint64_t value, then we make
	* it look like a one element array to make it easier to process.
	*/
	static int
	nvpair64_to_stat_array(nvlist_t nvl, const char name,
	struct stat_array *nva)
	{
	nvpair_t *tmp;
	int ret;

	verify(nvlist_lookup_nvpair(nvl, name, &tmp) == 0);
	switch (nvpair_type(tmp)) {
	case DATA_TYPE_UINT64_ARRAY:
	ret = nvpair_value_uint64_array(tmp, &nva->data, &nva->count);
	break;
	case DATA_TYPE_UINT64:
	ret = nvpair_value_uint64(tmp, &nva->__data);
	nva->data = &nva->__data;
	nva->count = 1;
	break;
	default:
	/* Not a uint64_t */
	ret = EINVAL;
	break;
	}

	return (ret);
	}

	/*
	* Given a list of nvlist names, look up the extended stats in newnv and oldnv,
	* subtract them, and return the results in a newly allocated stat_array.
	* You must free the returned array after you are done with it with
	* free_calc_stats().
	*
	* Additionally, you can set "oldnv" to NULL if you simply want the newnv
	* values.
	*/
	static struct stat_array *
	calc_and_alloc_stats_ex(const char *names, unsigned int len, nvlist_t oldnv,
	nvlist_t *newnv)
	{
	nvlist_t oldnvx = NULL, newnvx;
	struct stat_array oldnva, newnva, *calcnva;
	int i, j;
	unsigned int alloc_size = (sizeof (struct stat_array)) * len;

	/* Extract our extended stats nvlist from the main list */
	verify(nvlist_lookup_nvlist(newnv, ZPOOL_CONFIG_VDEV_STATS_EX,
	&newnvx) == 0);
	if (oldnv) {
	verify(nvlist_lookup_nvlist(oldnv, ZPOOL_CONFIG_VDEV_STATS_EX,
	&oldnvx) == 0);
	}

	newnva = safe_malloc(alloc_size);
	oldnva = safe_malloc(alloc_size);
	calcnva = safe_malloc(alloc_size);

	for (j = 0; j < len; j++) {
	verify(nvpair64_to_stat_array(newnvx, names[j],
	&newnva[j]) == 0);
	calcnva[j].count = newnva[j].count;
	alloc_size = calcnva[j].count * sizeof (calcnva[j].data[0]);
	calcnva[j].data = safe_malloc(alloc_size);
	memcpy(calcnva[j].data, newnva[j].data, alloc_size);

	if (oldnvx) {
	verify(nvpair64_to_stat_array(oldnvx, names[j],
	&oldnva[j]) == 0);
	for (i = 0; i < oldnva[j].count; i++)
	calcnva[j].data[i] -= oldnva[j].data[i];
	}
	}
	free(newnva);
	free(oldnva);
	return (calcnva);
	}

	static void
	free_calc_stats(struct stat_array *nva, unsigned int len)
	{
	int i;
	for (i = 0; i < len; i++)
	free(nva[i].data);

	free(nva);
	}

	static void
	print_iostat_histo(struct stat_array *nva, unsigned int len,
	iostat_cbdata_t *cb, unsigned int column_width, unsigned int namewidth,
	double scale)
	{
	int i, j;
	char buf[6];
	uint64_t val;
	enum zfs_nicenum_format format;
	unsigned int buckets;
	unsigned int start_bucket;

	if (cb->cb_literal)
	format = ZFS_NICENUM_RAW;
	else
	format = ZFS_NICENUM_1024;

	/* All these histos are the same size, so just use nva[0].count */
	buckets = nva[0].count;

	if (cb->cb_flags & IOS_RQ_HISTO_M) {
	/* Start at 512 - req size should never be lower than this */
	start_bucket = 9;
	} else {
	start_bucket = 0;
	}

	for (j = start_bucket; j < buckets; j++) {
	/* Print histogram bucket label */
	if (cb->cb_flags & IOS_L_HISTO_M) {
	/* Ending range of this bucket */
	val = (1UL << (j + 1)) - 1;
	zfs_nicetime(val, buf, sizeof (buf));
	} else {
	/* Request size (starting range of bucket) */
	val = (1UL << j);
	zfs_nicenum(val, buf, sizeof (buf));
	}

	if (cb->cb_scripted)
	printf("%llu", (u_longlong_t)val);
	else
	printf("%-*s", namewidth, buf);

	/* Print the values on the line */
	for (i = 0; i < len; i++) {
	print_one_stat(nva[i].data[j] * scale, format,
	column_width, cb->cb_scripted);
	}
	printf("\n");
	}
	}

	static void
	print_solid_separator(unsigned int length)
	{
	while (length--)
	printf("-");
	printf("\n");
	}

	static void
	print_iostat_histos(iostat_cbdata_t cb, nvlist_t oldnv,
	nvlist_t newnv, double scale, const char name)
	{
	unsigned int column_width;
	unsigned int namewidth;
	unsigned int entire_width;
	enum iostat_type type;
	struct stat_array *nva;
	const char **names;
	unsigned int names_len;

	/* What type of histo are we? */
	type = IOS_HISTO_IDX(cb->cb_flags);

	/* Get NULL-terminated array of nvlist names for our histo */
	names = vsx_type_to_nvlist[type];
	names_len = str_array_len(names); /* num of names */

	nva = calc_and_alloc_stats_ex(names, names_len, oldnv, newnv);

	if (cb->cb_literal) {
	column_width = MAX(5,
	(unsigned int) log10(stat_histo_max(nva, names_len)) + 1);
	} else {
	column_width = 5;
	}

	namewidth = MAX(cb->cb_namewidth,
	strlen(histo_to_title[IOS_HISTO_IDX(cb->cb_flags)]));

	/*
	* Calculate the entire line width of what we're printing. The
	* +2 is for the two spaces between columns:
	*/
	/* read write */
	/* ----- ----- */
	/* \|___\| <---------- column_width */
	/* */
	/* \|__________\| <--- entire_width */
	/* */
	entire_width = namewidth + (column_width + 2) *
	label_array_len(iostat_bottom_labels[type]);

	if (cb->cb_scripted)
	printf("%s\n", name);
	else
	print_iostat_header_impl(cb, column_width, name);

	print_iostat_histo(nva, names_len, cb, column_width,
	namewidth, scale);

	free_calc_stats(nva, names_len);
	if (!cb->cb_scripted)
	print_solid_separator(entire_width);
	}

	/*
	* Calculate the average latency of a power-of-two latency histogram
	*/
	static uint64_t
	single_histo_average(uint64_t *histo, unsigned int buckets)
	{
	int i;
	uint64_t count = 0, total = 0;

	for (i = 0; i < buckets; i++) {
	/*
	* Our buckets are power-of-two latency ranges. Use the
	* midpoint latency of each bucket to calculate the average.
	* For example:
	*
	* Bucket Midpoint
	* 8ns-15ns: 12ns
	* 16ns-31ns: 24ns
	* ...
	*/
	if (histo[i] != 0) {
	total += histo[i] * (((1UL << i) + ((1UL << i)/2)));
	count += histo[i];
	}
	}

	/* Prevent divide by zero */
	return (count == 0 ? 0 : total / count);
	}

	static void
	print_iostat_queues(iostat_cbdata_t cb, nvlist_t oldnv,
	nvlist_t *newnv)
	{
	int i;
	uint64_t val;
	const char *names[] = {
	ZPOOL_CONFIG_VDEV_SYNC_R_PEND_QUEUE,
	ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_SYNC_W_PEND_QUEUE,
	ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_ASYNC_R_PEND_QUEUE,
	ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_ASYNC_W_PEND_QUEUE,
	ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_SCRUB_PEND_QUEUE,
	ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE,
	ZPOOL_CONFIG_VDEV_TRIM_PEND_QUEUE,
	ZPOOL_CONFIG_VDEV_TRIM_ACTIVE_QUEUE,
	};

	struct stat_array *nva;

	unsigned int column_width = default_column_width(cb, IOS_QUEUES);
	enum zfs_nicenum_format format;

	nva = calc_and_alloc_stats_ex(names, ARRAY_SIZE(names), NULL, newnv);

	if (cb->cb_literal)
	format = ZFS_NICENUM_RAW;
	else
	format = ZFS_NICENUM_1024;

	for (i = 0; i < ARRAY_SIZE(names); i++) {
	val = nva[i].data[0];
	print_one_stat(val, format, column_width, cb->cb_scripted);
	}

	free_calc_stats(nva, ARRAY_SIZE(names));
	}

	static void
	print_iostat_latency(iostat_cbdata_t cb, nvlist_t oldnv,
	nvlist_t *newnv)
	{
	int i;
	uint64_t val;
	const char *names[] = {
	ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_SYNC_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_SYNC_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_ASYNC_R_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_ASYNC_W_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_SCRUB_LAT_HISTO,
	ZPOOL_CONFIG_VDEV_TRIM_LAT_HISTO,
	};
	struct stat_array *nva;

	unsigned int column_width = default_column_width(cb, IOS_LATENCY);
	enum zfs_nicenum_format format;

	nva = calc_and_alloc_stats_ex(names, ARRAY_SIZE(names), oldnv, newnv);

	if (cb->cb_literal)
	format = ZFS_NICENUM_RAWTIME;
	else
	format = ZFS_NICENUM_TIME;

	/* Print our avg latencies on the line */
	for (i = 0; i < ARRAY_SIZE(names); i++) {
	/* Compute average latency for a latency histo */
	val = single_histo_average(nva[i].data, nva[i].count);
	print_one_stat(val, format, column_width, cb->cb_scripted);
	}
	free_calc_stats(nva, ARRAY_SIZE(names));
	}

	/*
	* Print default statistics (capacity/operations/bandwidth)
	*/
	static void
	print_iostat_default(vdev_stat_t vs, iostat_cbdata_t cb, double scale)
	{
	unsigned int column_width = default_column_width(cb, IOS_DEFAULT);
	enum zfs_nicenum_format format;
	char na; /* char to print for "not applicable" values */

	if (cb->cb_literal) {
	format = ZFS_NICENUM_RAW;
	na = '0';
	} else {
	format = ZFS_NICENUM_1024;
	na = '-';
	}

	/* only toplevel vdevs have capacity stats */
	if (vs->vs_space == 0) {
	if (cb->cb_scripted)
	printf("\t%c\t%c", na, na);
	else
	printf(" %c %c", column_width, na, column_width,
	na);
	} else {
	print_one_stat(vs->vs_alloc, format, column_width,
	cb->cb_scripted);
	print_one_stat(vs->vs_space - vs->vs_alloc, format,
	column_width, cb->cb_scripted);
	}

	print_one_stat((uint64_t)(vs->vs_ops[ZIO_TYPE_READ] * scale),
	format, column_width, cb->cb_scripted);
	print_one_stat((uint64_t)(vs->vs_ops[ZIO_TYPE_WRITE] * scale),
	format, column_width, cb->cb_scripted);
	print_one_stat((uint64_t)(vs->vs_bytes[ZIO_TYPE_READ] * scale),
	format, column_width, cb->cb_scripted);
	print_one_stat((uint64_t)(vs->vs_bytes[ZIO_TYPE_WRITE] * scale),
	format, column_width, cb->cb_scripted);
	}

	static const char *class_name[] = {
	VDEV_ALLOC_BIAS_DEDUP,
	VDEV_ALLOC_BIAS_SPECIAL,
	VDEV_ALLOC_CLASS_LOGS
	};

	/*
	* Print out all the statistics for the given vdev. This can either be the
	* toplevel configuration, or called recursively. If 'name' is NULL, then this
	* is a verbose output, and we don't want to display the toplevel pool stats.
	*
	* Returns the number of stat lines printed.
	*/
	static unsigned int
	print_vdev_stats(zpool_handle_t zhp, const char name, nvlist_t *oldnv,
	nvlist_t newnv, iostat_cbdata_t cb, int depth)
	{
	nvlist_t oldchild, newchild;
	uint_t c, children, oldchildren;
	vdev_stat_t oldvs, newvs, *calcvs;
	vdev_stat_t zerovs = { 0 };
	char *vname;
	int i;
	int ret = 0;
	uint64_t tdelta;
	double scale;

	if (strcmp(name, VDEV_TYPE_INDIRECT) == 0)
	return (ret);

	calcvs = safe_malloc(sizeof (*calcvs));

	if (oldnv != NULL) {
	verify(nvlist_lookup_uint64_array(oldnv,
	ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&oldvs, &c) == 0);
	} else {
	oldvs = &zerovs;
	}

	/* Do we only want to see a specific vdev? */
	for (i = 0; i < cb->cb_vdev_names_count; i++) {
	/* Yes we do. Is this the vdev? */
	if (strcmp(name, cb->cb_vdev_names[i]) == 0) {
	/*
	* This is our vdev. Since it is the only vdev we
	* will be displaying, make depth = 0 so that it
	* doesn't get indented.
	*/
	depth = 0;
	break;
	}
	}

	if (cb->cb_vdev_names_count && (i == cb->cb_vdev_names_count)) {
	/* Couldn't match the name */
	goto children;
	}


	verify(nvlist_lookup_uint64_array(newnv, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&newvs, &c) == 0);

	/*
	* Print the vdev name unless it's is a histogram. Histograms
	* display the vdev name in the header itself.
	*/
	if (!(cb->cb_flags & IOS_ANYHISTO_M)) {
	if (cb->cb_scripted) {
	printf("%s", name);
	} else {
	if (strlen(name) + depth > cb->cb_namewidth)
	(void) printf("%*s%s", depth, "", name);
	else
	(void) printf("%s%s%s", depth, "", name,
	(int)(cb->cb_namewidth - strlen(name) -
	depth), "");
	}
	}

	/* Calculate our scaling factor */
	tdelta = newvs->vs_timestamp - oldvs->vs_timestamp;
	if ((oldvs->vs_timestamp == 0) && (cb->cb_flags & IOS_ANYHISTO_M)) {
	/*
	* If we specify printing histograms with no time interval, then
	* print the histogram numbers over the entire lifetime of the
	* vdev.
	*/
	scale = 1;
	} else {
	if (tdelta == 0)
	scale = 1.0;
	else
	scale = (double)NANOSEC / tdelta;
	}

	if (cb->cb_flags & IOS_DEFAULT_M) {
	calc_default_iostats(oldvs, newvs, calcvs);
	print_iostat_default(calcvs, cb, scale);
	}
	if (cb->cb_flags & IOS_LATENCY_M)
	print_iostat_latency(cb, oldnv, newnv);
	if (cb->cb_flags & IOS_QUEUES_M)
	print_iostat_queues(cb, oldnv, newnv);
	if (cb->cb_flags & IOS_ANYHISTO_M) {
	printf("\n");
	print_iostat_histos(cb, oldnv, newnv, scale, name);
	}

	if (cb->vcdl != NULL) {
	char *path;
	if (nvlist_lookup_string(newnv, ZPOOL_CONFIG_PATH,
	&path) == 0) {
	printf(" ");
	zpool_print_cmd(cb->vcdl, zpool_get_name(zhp), path);
	}
	}

	if (!(cb->cb_flags & IOS_ANYHISTO_M))
	printf("\n");

	ret++;

	children:

	free(calcvs);

	if (!cb->cb_verbose)
	return (ret);

	if (nvlist_lookup_nvlist_array(newnv, ZPOOL_CONFIG_CHILDREN,
	&newchild, &children) != 0)
	return (ret);

	if (oldnv) {
	if (nvlist_lookup_nvlist_array(oldnv, ZPOOL_CONFIG_CHILDREN,
	&oldchild, &oldchildren) != 0)
	return (ret);

	children = MIN(oldchildren, children);
	}

	/*
	* print normal top-level devices
	*/
	for (c = 0; c < children; c++) {
	uint64_t ishole = B_FALSE, islog = B_FALSE;

	(void) nvlist_lookup_uint64(newchild[c], ZPOOL_CONFIG_IS_HOLE,
	&ishole);

	(void) nvlist_lookup_uint64(newchild[c], ZPOOL_CONFIG_IS_LOG,
	&islog);

	if (ishole \|\| islog)
	continue;

	if (nvlist_exists(newchild[c], ZPOOL_CONFIG_ALLOCATION_BIAS))
	continue;

	vname = zpool_vdev_name(g_zfs, zhp, newchild[c],
	cb->cb_name_flags);
	ret += print_vdev_stats(zhp, vname, oldnv ? oldchild[c] : NULL,
	newchild[c], cb, depth + 2);
	free(vname);
	}

	/*
	* print all other top-level devices
	*/
	for (uint_t n = 0; n < 3; n++) {
	boolean_t printed = B_FALSE;

	for (c = 0; c < children; c++) {
	uint64_t islog = B_FALSE;
	char *bias = NULL;
	char *type = NULL;

	(void) nvlist_lookup_uint64(newchild[c],
	ZPOOL_CONFIG_IS_LOG, &islog);
	if (islog) {
	bias = VDEV_ALLOC_CLASS_LOGS;
	} else {
	(void) nvlist_lookup_string(newchild[c],
	ZPOOL_CONFIG_ALLOCATION_BIAS, &bias);
	(void) nvlist_lookup_string(newchild[c],
	ZPOOL_CONFIG_TYPE, &type);
	}
	if (bias == NULL \|\| strcmp(bias, class_name[n]) != 0)
	continue;
	if (!islog && strcmp(type, VDEV_TYPE_INDIRECT) == 0)
	continue;

	if (!printed) {
	if ((!(cb->cb_flags & IOS_ANYHISTO_M)) &&
	!cb->cb_scripted && !cb->cb_vdev_names) {
	print_iostat_dashes(cb, 0,
	class_name[n]);
	}
	printf("\n");
	printed = B_TRUE;
	}

	vname = zpool_vdev_name(g_zfs, zhp, newchild[c],
	cb->cb_name_flags);
	ret += print_vdev_stats(zhp, vname, oldnv ?
	oldchild[c] : NULL, newchild[c], cb, depth + 2);
	free(vname);
	}
	}

	/*
	* Include level 2 ARC devices in iostat output
	*/
	if (nvlist_lookup_nvlist_array(newnv, ZPOOL_CONFIG_L2CACHE,
	&newchild, &children) != 0)
	return (ret);

	if (oldnv) {
	if (nvlist_lookup_nvlist_array(oldnv, ZPOOL_CONFIG_L2CACHE,
	&oldchild, &oldchildren) != 0)
	return (ret);

	children = MIN(oldchildren, children);
	}

	if (children > 0) {
	if ((!(cb->cb_flags & IOS_ANYHISTO_M)) && !cb->cb_scripted &&
	!cb->cb_vdev_names) {
	print_iostat_dashes(cb, 0, "cache");
	}
	printf("\n");

	for (c = 0; c < children; c++) {
	vname = zpool_vdev_name(g_zfs, zhp, newchild[c],
	cb->cb_name_flags);
	ret += print_vdev_stats(zhp, vname, oldnv ? oldchild[c]
	: NULL, newchild[c], cb, depth + 2);
	free(vname);
	}
	}

	return (ret);
	}

	static int
	refresh_iostat(zpool_handle_t zhp, void data)
	{
	iostat_cbdata_t *cb = data;
	boolean_t missing;

	/*
	* If the pool has disappeared, remove it from the list and continue.
	*/
	if (zpool_refresh_stats(zhp, &missing) != 0)
	return (-1);

	if (missing)
	pool_list_remove(cb->cb_list, zhp);

	return (0);
	}

	/*
	* Callback to print out the iostats for the given pool.
	*/
	static int
	print_iostat(zpool_handle_t zhp, void data)
	{
	iostat_cbdata_t *cb = data;
	nvlist_t oldconfig, newconfig;
	nvlist_t oldnvroot, newnvroot;
	int ret;

	newconfig = zpool_get_config(zhp, &oldconfig);

	if (cb->cb_iteration == 1)
	oldconfig = NULL;

	verify(nvlist_lookup_nvlist(newconfig, ZPOOL_CONFIG_VDEV_TREE,
	&newnvroot) == 0);

	if (oldconfig == NULL)
	oldnvroot = NULL;
	else
	verify(nvlist_lookup_nvlist(oldconfig, ZPOOL_CONFIG_VDEV_TREE,
	&oldnvroot) == 0);

	ret = print_vdev_stats(zhp, zpool_get_name(zhp), oldnvroot, newnvroot,
	cb, 0);
	if ((ret != 0) && !(cb->cb_flags & IOS_ANYHISTO_M) &&
	!cb->cb_scripted && cb->cb_verbose && !cb->cb_vdev_names_count) {
	print_iostat_separator(cb);
	if (cb->vcdl != NULL) {
	print_cmd_columns(cb->vcdl, 1);
	}
	printf("\n");
	}

	return (ret);
	}

	static int
	get_columns(void)
	{
	struct winsize ws;
	int columns = 80;
	int error;

	if (isatty(STDOUT_FILENO)) {
	error = ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
	if (error == 0)
	columns = ws.ws_col;
	} else {
	columns = 999;
	}

	return (columns);
	}

	/*
	* Return the required length of the pool/vdev name column. The minimum
	* allowed width and output formatting flags must be provided.
	*/
	static int
	get_namewidth(zpool_handle_t *zhp, int min_width, int flags, boolean_t verbose)
	{
	nvlist_t config, nvroot;
	int width = min_width;

	if ((config = zpool_get_config(zhp, NULL)) != NULL) {
	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	&nvroot) == 0);
	unsigned int poolname_len = strlen(zpool_get_name(zhp));
	if (verbose == B_FALSE) {
	width = MAX(poolname_len, min_width);
	} else {
	width = MAX(poolname_len,
	max_width(zhp, nvroot, 0, min_width, flags));
	}
	}

	return (width);
	}

	/*
	* Parse the input string, get the 'interval' and 'count' value if there is one.
	*/
	static void
	get_interval_count(int argcp, char argv, float iv,
	unsigned long *cnt)
	{
	float interval = 0;
	unsigned long count = 0;
	int argc = *argcp;

	/*
	* Determine if the last argument is an integer or a pool name
	*/
	if (argc > 0 && zfs_isnumber(argv[argc - 1])) {
	char *end;

	errno = 0;
	interval = strtof(argv[argc - 1], &end);

	if (*end == '\0' && errno == 0) {
	if (interval == 0) {
	(void) fprintf(stderr, gettext(
	"interval cannot be zero\n"));
	usage(B_FALSE);
	}
	/*
	* Ignore the last parameter
	*/
	argc--;
	} else {
	/*
	* If this is not a valid number, just plow on. The
	* user will get a more informative error message later
	* on.
	*/
	interval = 0;
	}
	}

	/*
	* If the last argument is also an integer, then we have both a count
	* and an interval.
	*/
	if (argc > 0 && zfs_isnumber(argv[argc - 1])) {
	char *end;

	errno = 0;
	count = interval;
	interval = strtof(argv[argc - 1], &end);

	if (*end == '\0' && errno == 0) {
	if (interval == 0) {
	(void) fprintf(stderr, gettext(
	"interval cannot be zero\n"));
	usage(B_FALSE);
	}

	/*
	* Ignore the last parameter
	*/
	argc--;
	} else {
	interval = 0;
	}
	}

	*iv = interval;
	*cnt = count;
	*argcp = argc;
	}

	static void
	get_timestamp_arg(char c)
	{
	if (c == 'u')
	timestamp_fmt = UDATE;
	else if (c == 'd')
	timestamp_fmt = DDATE;
	else
	usage(B_FALSE);
	}

	/*
	* Return stat flags that are supported by all pools by both the module and
	* zpool iostat. "*data" should be initialized to all 0xFFs before running.
	* It will get ANDed down until only the flags that are supported on all pools
	* remain.
	*/
	static int
	get_stat_flags_cb(zpool_handle_t zhp, void data)
	{
	uint64_t *mask = data;
	nvlist_t config, nvroot, *nvx;
	uint64_t flags = 0;
	int i, j;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	&nvroot) == 0);

	/* Default stats are always supported, but for completeness.. */
	if (nvlist_exists(nvroot, ZPOOL_CONFIG_VDEV_STATS))
	flags \|= IOS_DEFAULT_M;

	/* Get our extended stats nvlist from the main list */
	if (nvlist_lookup_nvlist(nvroot, ZPOOL_CONFIG_VDEV_STATS_EX,
	&nvx) != 0) {
	/*
	* No extended stats; they're probably running an older
	* module. No big deal, we support that too.
	*/
	goto end;
	}

	/* For each extended stat, make sure all its nvpairs are supported */
	for (j = 0; j < ARRAY_SIZE(vsx_type_to_nvlist); j++) {
	if (!vsx_type_to_nvlist[j][0])
	continue;

	/* Start off by assuming the flag is supported, then check */
	flags \|= (1ULL << j);
	for (i = 0; vsx_type_to_nvlist[j][i]; i++) {
	if (!nvlist_exists(nvx, vsx_type_to_nvlist[j][i])) {
	/* flag isn't supported */
	flags = flags & ~(1ULL << j);
	break;
	}
	}
	}
	end:
	mask = mask & flags;
	return (0);
	}

	/*
	* Return a bitmask of stats that are supported on all pools by both the module
	* and zpool iostat.
	*/
	static uint64_t
	get_stat_flags(zpool_list_t *list)
	{
	uint64_t mask = -1;

	/*
	* get_stat_flags_cb() will lop off bits from "mask" until only the
	* flags that are supported on all pools remain.
	*/
	pool_list_iter(list, B_FALSE, get_stat_flags_cb, &mask);
	return (mask);
	}

	/*
	* Return 1 if cb_data->cb_vdev_names[0] is this vdev's name, 0 otherwise.
	*/
	static int
	is_vdev_cb(zpool_handle_t zhp, nvlist_t nv, void *cb_data)
	{
	iostat_cbdata_t *cb = cb_data;
	char *name = NULL;
	int ret = 0;

	name = zpool_vdev_name(g_zfs, zhp, nv, cb->cb_name_flags);

	if (strcmp(name, cb->cb_vdev_names[0]) == 0)
	ret = 1; /* match */
	free(name);

	return (ret);
	}

	/*
	* Returns 1 if cb_data->cb_vdev_names[0] is a vdev name, 0 otherwise.
	*/
	static int
	is_vdev(zpool_handle_t zhp, void cb_data)
	{
	return (for_each_vdev(zhp, is_vdev_cb, cb_data));
	}

	/*
	* Check if vdevs are in a pool
	*
	* Return 1 if all argv[] strings are vdev names in pool "pool_name". Otherwise
	* return 0. If pool_name is NULL, then search all pools.
	*/
	static int
	are_vdevs_in_pool(int argc, char *argv, char pool_name,
	iostat_cbdata_t *cb)
	{
	char **tmp_name;
	int ret = 0;
	int i;
	int pool_count = 0;

	if ((argc == 0) \|\| !*argv)
	return (0);

	if (pool_name)
	pool_count = 1;

	/* Temporarily hijack cb_vdev_names for a second... */
	tmp_name = cb->cb_vdev_names;

	/* Go though our list of prospective vdev names */
	for (i = 0; i < argc; i++) {
	cb->cb_vdev_names = argv + i;

	/* Is this name a vdev in our pools? */
	ret = for_each_pool(pool_count, &pool_name, B_TRUE, NULL,
	B_FALSE, is_vdev, cb);
	if (!ret) {
	/* No match */
	break;
	}
	}

	cb->cb_vdev_names = tmp_name;

	return (ret);
	}

	static int
	is_pool_cb(zpool_handle_t zhp, void data)
	{
	char *name = data;
	if (strcmp(name, zpool_get_name(zhp)) == 0)
	return (1);

	return (0);
	}

	/*
	* Do we have a pool named *name? If so, return 1, otherwise 0.
	*/
	static int
	is_pool(char *name)
	{
	return (for_each_pool(0, NULL, B_TRUE, NULL, B_FALSE, is_pool_cb,
	name));
	}

	/* Are all our argv[] strings pool names? If so return 1, 0 otherwise. */
	static int
	are_all_pools(int argc, char **argv)
	{
	if ((argc == 0) \|\| !*argv)
	return (0);

	while (--argc >= 0)
	if (!is_pool(argv[argc]))
	return (0);

	return (1);
	}

	/*
	* Helper function to print out vdev/pool names we can't resolve. Used for an
	* error message.
	*/
	static void
	error_list_unresolved_vdevs(int argc, char *argv, char pool_name,
	iostat_cbdata_t *cb)
	{
	int i;
	char *name;
	char *str;
	for (i = 0; i < argc; i++) {
	name = argv[i];

	if (is_pool(name))
	str = gettext("pool");
	else if (are_vdevs_in_pool(1, &name, pool_name, cb))
	str = gettext("vdev in this pool");
	else if (are_vdevs_in_pool(1, &name, NULL, cb))
	str = gettext("vdev in another pool");
	else
	str = gettext("unknown");

	fprintf(stderr, "\t%s (%s)\n", name, str);
	}
	}

	/*
	* Same as get_interval_count(), but with additional checks to not misinterpret
	* guids as interval/count values. Assumes VDEV_NAME_GUID is set in
	* cb.cb_name_flags.
	*/
	static void
	get_interval_count_filter_guids(int argc, char argv, float interval,
	unsigned long count, iostat_cbdata_t cb)
	{
	char **tmpargv = argv;
	int argc_for_interval = 0;

	/* Is the last arg an interval value? Or a guid? */
	if (argc >= 1 && !are_vdevs_in_pool(1, &argv[argc - 1], NULL, cb)) {
	/*
	* The last arg is not a guid, so it's probably an
	* interval value.
	*/
	argc_for_interval++;

	if (*argc >= 2 &&
	!are_vdevs_in_pool(1, &argv[*argc - 2], NULL, cb)) {
	/*
	* The 2nd to last arg is not a guid, so it's probably
	* an interval value.
	*/
	argc_for_interval++;
	}
	}

	/* Point to our list of possible intervals */
	tmpargv = &argv[*argc - argc_for_interval];

	argc = argc - argc_for_interval;
	get_interval_count(&argc_for_interval, tmpargv,
	interval, count);
	}

	/*
	* Floating point sleep(). Allows you to pass in a floating point value for
	* seconds.
	*/
	static void
	fsleep(float sec)
	{
	struct timespec req;
	req.tv_sec = floor(sec);
	req.tv_nsec = (sec - (float)req.tv_sec) * NANOSEC;
	nanosleep(&req, NULL);
	}

	/*
	* Terminal height, in rows. Returns -1 if stdout is not connected to a TTY or
	* if we were unable to determine its size.
	*/
	static int
	terminal_height(void)
	{
	struct winsize win;

	if (isatty(STDOUT_FILENO) == 0)
	return (-1);

	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) != -1 && win.ws_row > 0)
	return (win.ws_row);

	return (-1);
	}

	/*
	* Run one of the zpool status/iostat -c scripts with the help (-h) option and
	* print the result.
	*
	* name: Short name of the script ('iostat').
	* path: Full path to the script ('/usr/local/etc/zfs/zpool.d/iostat');
	*/
	static void
	print_zpool_script_help(char name, char path)
	{
	char *argv[] = {path, "-h", NULL};
	char **lines = NULL;
	int lines_cnt = 0;
	int rc;

	rc = libzfs_run_process_get_stdout_nopath(path, argv, NULL, &lines,
	&lines_cnt);
	if (rc != 0 \|\| lines == NULL \|\| lines_cnt <= 0) {
	if (lines != NULL)
	libzfs_free_str_array(lines, lines_cnt);
	return;
	}

	for (int i = 0; i < lines_cnt; i++)
	if (!is_blank_str(lines[i]))
	printf(" %-14s %s\n", name, lines[i]);

	libzfs_free_str_array(lines, lines_cnt);
	}

	/*
	* Go though the zpool status/iostat -c scripts in the user's path, run their
	* help option (-h), and print out the results.
	*/
	static void
	print_zpool_dir_scripts(char *dirpath)
	{
	DIR *dir;
	struct dirent *ent;
	char fullpath[MAXPATHLEN];
	struct stat dir_stat;

	if ((dir = opendir(dirpath)) != NULL) {
	/* print all the files and directories within directory */
	while ((ent = readdir(dir)) != NULL) {
	sprintf(fullpath, "%s/%s", dirpath, ent->d_name);

	/* Print the scripts */
	if (stat(fullpath, &dir_stat) == 0)
	if (dir_stat.st_mode & S_IXUSR &&
	S_ISREG(dir_stat.st_mode))
	print_zpool_script_help(ent->d_name,
	fullpath);
	}
	closedir(dir);
	}
	}

	/*
	* Print out help text for all zpool status/iostat -c scripts.
	*/
	static void
	print_zpool_script_list(char *subcommand)
	{
	char dir, sp;

	printf(gettext("Available 'zpool %s -c' commands:\n"), subcommand);

	sp = zpool_get_cmd_search_path();
	if (sp == NULL)
	return;

	dir = strtok(sp, ":");
	while (dir != NULL) {
	print_zpool_dir_scripts(dir);
	dir = strtok(NULL, ":");
	}

	free(sp);
	}

	/*
	* Set the minimum pool/vdev name column width. The width must be at least 10,
	* but may be as large as the column width - 42 so it still fits on one line.
	* NOTE: 42 is the width of the default capacity/operations/bandwidth output
	*/
	static int
	get_namewidth_iostat(zpool_handle_t zhp, void data)
	{
	iostat_cbdata_t *cb = data;
	int width, available_width;

	/*
	* get_namewidth() returns the maximum width of any name in that column
	* for any pool/vdev/device line that will be output.
	*/
	width = get_namewidth(zhp, cb->cb_namewidth, cb->cb_name_flags,
	cb->cb_verbose);

	/*
	* The width we are calculating is the width of the header and also the
	* padding width for names that are less than maximum width. The stats
	* take up 42 characters, so the width available for names is:
	*/
	available_width = get_columns() - 42;

	/*
	* If the maximum width fits on a screen, then great! Make everything
	* line up by justifying all lines to the same width. If that max
	* width is larger than what's available, the name plus stats won't fit
	* on one line, and justifying to that width would cause every line to
	* wrap on the screen. We only want lines with long names to wrap.
	* Limit the padding to what won't wrap.
	*/
	if (width > available_width)
	width = available_width;

	/*
	* And regardless of whatever the screen width is (get_columns can
	* return 0 if the width is not known or less than 42 for a narrow
	* terminal) have the width be a minimum of 10.
	*/
	if (width < 10)
	width = 10;

	/* Save the calculated width */
	cb->cb_namewidth = width;

	return (0);
	}

	/*
	* zpool iostat [[-c [script1,script2,...]] [-lq]\|[-rw]] [-ghHLpPvy] [-n name]
	* [-T d\|u] [[ pool ...]\|[pool vdev ...]\|[vdev ...]]
	* [interval [count]]
	*
	* -c CMD For each vdev, run command CMD
	* -g Display guid for individual vdev name.
	* -L Follow links when resolving vdev path name.
	* -P Display full path for vdev name.
	* -v Display statistics for individual vdevs
	* -h Display help
	* -p Display values in parsable (exact) format.
	* -H Scripted mode. Don't display headers, and separate properties
	* by a single tab.
	* -l Display average latency
	* -q Display queue depths
	* -w Display latency histograms
	* -r Display request size histogram
	* -T Display a timestamp in date(1) or Unix format
	* -n Only print headers once
	*
	* This command can be tricky because we want to be able to deal with pool
	* creation/destruction as well as vdev configuration changes. The bulk of this
	* processing is handled by the pool_list_* routines in zpool_iter.c. We rely
	* on pool_list_update() to detect the addition of new pools. Configuration
	* changes are all handled within libzfs.
	*/
	int
	zpool_do_iostat(int argc, char **argv)
	{
	int c;
	int ret;
	int npools;
	float interval = 0;
	unsigned long count = 0;
	int winheight = 24;
	zpool_list_t *list;
	boolean_t verbose = B_FALSE;
	boolean_t latency = B_FALSE, l_histo = B_FALSE, rq_histo = B_FALSE;
	boolean_t queues = B_FALSE, parsable = B_FALSE, scripted = B_FALSE;
	boolean_t omit_since_boot = B_FALSE;
	boolean_t guid = B_FALSE;
	boolean_t follow_links = B_FALSE;
	boolean_t full_name = B_FALSE;
	boolean_t headers_once = B_FALSE;
	iostat_cbdata_t cb = { 0 };
	char *cmd = NULL;

	/* Used for printing error message */
	const char flag_to_arg[] = {[IOS_LATENCY] = 'l', [IOS_QUEUES] = 'q',
	[IOS_L_HISTO] = 'w', [IOS_RQ_HISTO] = 'r'};

	uint64_t unsupported_flags;

	/* check options */
	while ((c = getopt(argc, argv, "c:gLPT:vyhplqrwnH")) != -1) {
	switch (c) {
	case 'c':
	if (cmd != NULL) {
	fprintf(stderr,
	gettext("Can't set -c flag twice\n"));
	exit(1);
	}

	if (getenv("ZPOOL_SCRIPTS_ENABLED") != NULL &&
	!libzfs_envvar_is_set("ZPOOL_SCRIPTS_ENABLED")) {
	fprintf(stderr, gettext(
	"Can't run -c, disabled by "
	"ZPOOL_SCRIPTS_ENABLED.\n"));
	exit(1);
	}

	if ((getuid() <= 0 \|\| geteuid() <= 0) &&
	!libzfs_envvar_is_set("ZPOOL_SCRIPTS_AS_ROOT")) {
	fprintf(stderr, gettext(
	"Can't run -c with root privileges "
	"unless ZPOOL_SCRIPTS_AS_ROOT is set.\n"));
	exit(1);
	}
	cmd = optarg;
	verbose = B_TRUE;
	break;
	case 'g':
	guid = B_TRUE;
	break;
	case 'L':
	follow_links = B_TRUE;
	break;
	case 'P':
	full_name = B_TRUE;
	break;
	case 'T':
	get_timestamp_arg(*optarg);
	break;
	case 'v':
	verbose = B_TRUE;
	break;
	case 'p':
	parsable = B_TRUE;
	break;
	case 'l':
	latency = B_TRUE;
	break;
	case 'q':
	queues = B_TRUE;
	break;
	case 'H':
	scripted = B_TRUE;
	break;
	case 'w':
	l_histo = B_TRUE;
	break;
	case 'r':
	rq_histo = B_TRUE;
	break;
	case 'y':
	omit_since_boot = B_TRUE;
	break;
	case 'n':
	headers_once = B_TRUE;
	break;
	case 'h':
	usage(B_FALSE);
	break;
	case '?':
	if (optopt == 'c') {
	print_zpool_script_list("iostat");
	exit(0);
	} else {
	fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	}
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	cb.cb_literal = parsable;
	cb.cb_scripted = scripted;

	if (guid)
	cb.cb_name_flags \|= VDEV_NAME_GUID;
	if (follow_links)
	cb.cb_name_flags \|= VDEV_NAME_FOLLOW_LINKS;
	if (full_name)
	cb.cb_name_flags \|= VDEV_NAME_PATH;
	cb.cb_iteration = 0;
	cb.cb_namewidth = 0;
	cb.cb_verbose = verbose;

	/* Get our interval and count values (if any) */
	if (guid) {
	get_interval_count_filter_guids(&argc, argv, &interval,
	&count, &cb);
	} else {
	get_interval_count(&argc, argv, &interval, &count);
	}

	if (argc == 0) {
	/* No args, so just print the defaults. */
	} else if (are_all_pools(argc, argv)) {
	/* All the args are pool names */
	} else if (are_vdevs_in_pool(argc, argv, NULL, &cb)) {
	/* All the args are vdevs */
	cb.cb_vdev_names = argv;
	cb.cb_vdev_names_count = argc;
	argc = 0; /* No pools to process */
	} else if (are_all_pools(1, argv)) {
	/* The first arg is a pool name */
	if (are_vdevs_in_pool(argc - 1, argv + 1, argv[0], &cb)) {
	/* ...and the rest are vdev names */
	cb.cb_vdev_names = argv + 1;
	cb.cb_vdev_names_count = argc - 1;
	argc = 1; /* One pool to process */
	} else {
	fprintf(stderr, gettext("Expected either a list of "));
	fprintf(stderr, gettext("pools, or list of vdevs in"));
	fprintf(stderr, " \"%s\", ", argv[0]);
	fprintf(stderr, gettext("but got:\n"));
	error_list_unresolved_vdevs(argc - 1, argv + 1,
	argv[0], &cb);
	fprintf(stderr, "\n");
	usage(B_FALSE);
	return (1);
	}
	} else {
	/*
	* The args don't make sense. The first arg isn't a pool name,
	* nor are all the args vdevs.
	*/
	fprintf(stderr, gettext("Unable to parse pools/vdevs list.\n"));
	fprintf(stderr, "\n");
	return (1);
	}

	if (cb.cb_vdev_names_count != 0) {
	/*
	* If user specified vdevs, it implies verbose.
	*/
	cb.cb_verbose = B_TRUE;
	}

	/*
	* Construct the list of all interesting pools.
	*/
	ret = 0;
	if ((list = pool_list_get(argc, argv, NULL, parsable, &ret)) == NULL)
	return (1);

	if (pool_list_count(list) == 0 && argc != 0) {
	pool_list_free(list);
	return (1);
	}

	if (pool_list_count(list) == 0 && interval == 0) {
	pool_list_free(list);
	(void) fprintf(stderr, gettext("no pools available\n"));
	return (1);
	}

	if ((l_histo \|\| rq_histo) && (cmd != NULL \|\| latency \|\| queues)) {
	pool_list_free(list);
	(void) fprintf(stderr,
	gettext("[-r\|-w] isn't allowed with [-c\|-l\|-q]\n"));
	usage(B_FALSE);
	return (1);
	}

	if (l_histo && rq_histo) {
	pool_list_free(list);
	(void) fprintf(stderr,
	gettext("Only one of [-r\|-w] can be passed at a time\n"));
	usage(B_FALSE);
	return (1);
	}

	/*
	* Enter the main iostat loop.
	*/
	cb.cb_list = list;

	if (l_histo) {
	/*
	* Histograms tables look out of place when you try to display
	* them with the other stats, so make a rule that you can only
	* print histograms by themselves.
	*/
	cb.cb_flags = IOS_L_HISTO_M;
	} else if (rq_histo) {
	cb.cb_flags = IOS_RQ_HISTO_M;
	} else {
	cb.cb_flags = IOS_DEFAULT_M;
	if (latency)
	cb.cb_flags \|= IOS_LATENCY_M;
	if (queues)
	cb.cb_flags \|= IOS_QUEUES_M;
	}

	/*
	* See if the module supports all the stats we want to display.
	*/
	unsupported_flags = cb.cb_flags & ~get_stat_flags(list);
	if (unsupported_flags) {
	uint64_t f;
	int idx;
	fprintf(stderr,
	gettext("The loaded zfs module doesn't support:"));

	/* for each bit set in unsupported_flags */
	for (f = unsupported_flags; f; f &= ~(1ULL << idx)) {
	idx = lowbit64(f) - 1;
	fprintf(stderr, " -%c", flag_to_arg[idx]);
	}

	fprintf(stderr, ". Try running a newer module.\n");
	pool_list_free(list);

	return (1);
	}

	for (;;) {
	if ((npools = pool_list_count(list)) == 0)
	(void) fprintf(stderr, gettext("no pools available\n"));
	else {
	/*
	* If this is the first iteration and -y was supplied
	* we skip any printing.
	*/
	boolean_t skip = (omit_since_boot &&
	cb.cb_iteration == 0);

	/*
	* Refresh all statistics. This is done as an
	* explicit step before calculating the maximum name
	* width, so that any * configuration changes are
	* properly accounted for.
	*/
	(void) pool_list_iter(list, B_FALSE, refresh_iostat,
	&cb);

	/*
	* Iterate over all pools to determine the maximum width
	* for the pool / device name column across all pools.
	*/
	cb.cb_namewidth = 0;
	(void) pool_list_iter(list, B_FALSE,
	get_namewidth_iostat, &cb);

	if (timestamp_fmt != NODATE)
	print_timestamp(timestamp_fmt);

	if (cmd != NULL && cb.cb_verbose &&
	!(cb.cb_flags & IOS_ANYHISTO_M)) {
	cb.vcdl = all_pools_for_each_vdev_run(argc,
	argv, cmd, g_zfs, cb.cb_vdev_names,
	cb.cb_vdev_names_count, cb.cb_name_flags);
	} else {
	cb.vcdl = NULL;
	}


	/*
	* Check terminal size so we can print headers
	* even when terminal window has its height
	* changed.
	*/
	winheight = terminal_height();
	/*
	* Are we connected to TTY? If not, headers_once
	* should be true, to avoid breaking scripts.
	*/
	if (winheight < 0)
	headers_once = B_TRUE;

	/*
	* If it's the first time and we're not skipping it,
	* or either skip or verbose mode, print the header.
	*
	* The histogram code explicitly prints its header on
	* every vdev, so skip this for histograms.
	*/
	if (((++cb.cb_iteration == 1 && !skip) \|\|
	(skip != verbose) \|\|
	(!headers_once &&
	(cb.cb_iteration % winheight) == 0)) &&
	(!(cb.cb_flags & IOS_ANYHISTO_M)) &&
	!cb.cb_scripted)
	print_iostat_header(&cb);

	if (skip) {
	(void) fsleep(interval);
	continue;
	}

	pool_list_iter(list, B_FALSE, print_iostat, &cb);

	/*
	* If there's more than one pool, and we're not in
	* verbose mode (which prints a separator for us),
	* then print a separator.
	*
	* In addition, if we're printing specific vdevs then
	* we also want an ending separator.
	*/
	if (((npools > 1 && !verbose &&
	!(cb.cb_flags & IOS_ANYHISTO_M)) \|\|
	(!(cb.cb_flags & IOS_ANYHISTO_M) &&
	cb.cb_vdev_names_count)) &&
	!cb.cb_scripted) {
	print_iostat_separator(&cb);
	if (cb.vcdl != NULL)
	print_cmd_columns(cb.vcdl, 1);
	printf("\n");
	}

	if (cb.vcdl != NULL)
	free_vdev_cmd_data_list(cb.vcdl);

	}

	/*
	* Flush the output so that redirection to a file isn't buffered
	* indefinitely.
	*/
	(void) fflush(stdout);

	if (interval == 0)
	break;

	if (count != 0 && --count == 0)
	break;

	(void) fsleep(interval);
	}

	pool_list_free(list);

	return (ret);
	}

	typedef struct list_cbdata {
	boolean_t cb_verbose;
	int cb_name_flags;
	int cb_namewidth;
	boolean_t cb_scripted;
	zprop_list_t *cb_proplist;
	boolean_t cb_literal;
	} list_cbdata_t;


	/*
	* Given a list of columns to display, output appropriate headers for each one.
	*/
	static void
	print_header(list_cbdata_t *cb)
	{
	zprop_list_t *pl = cb->cb_proplist;
	char headerbuf[ZPOOL_MAXPROPLEN];
	const char *header;
	boolean_t first = B_TRUE;
	boolean_t right_justify;
	size_t width = 0;

	for (; pl != NULL; pl = pl->pl_next) {
	width = pl->pl_width;
	if (first && cb->cb_verbose) {
	/*
	* Reset the width to accommodate the verbose listing
	* of devices.
	*/
	width = cb->cb_namewidth;
	}

	if (!first)
	(void) printf(" ");
	else
	first = B_FALSE;

	right_justify = B_FALSE;
	if (pl->pl_prop != ZPROP_INVAL) {
	header = zpool_prop_column_name(pl->pl_prop);
	right_justify = zpool_prop_align_right(pl->pl_prop);
	} else {
	int i;

	for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
	headerbuf[i] = toupper(pl->pl_user_prop[i]);
	headerbuf[i] = '\0';
	header = headerbuf;
	}

	if (pl->pl_next == NULL && !right_justify)
	(void) printf("%s", header);
	else if (right_justify)
	(void) printf("%*s", (int)width, header);
	else
	(void) printf("%-*s", (int)width, header);
	}

	(void) printf("\n");
	}

	/*
	* Given a pool and a list of properties, print out all the properties according
	* to the described layout. Used by zpool_do_list().
	*/
	static void
	print_pool(zpool_handle_t zhp, list_cbdata_t cb)
	{
	zprop_list_t *pl = cb->cb_proplist;
	boolean_t first = B_TRUE;
	char property[ZPOOL_MAXPROPLEN];
	char *propstr;
	boolean_t right_justify;
	size_t width;

	for (; pl != NULL; pl = pl->pl_next) {

	width = pl->pl_width;
	if (first && cb->cb_verbose) {
	/*
	* Reset the width to accommodate the verbose listing
	* of devices.
	*/
	width = cb->cb_namewidth;
	}

	if (!first) {
	if (cb->cb_scripted)
	(void) printf("\t");
	else
	(void) printf(" ");
	} else {
	first = B_FALSE;
	}

	right_justify = B_FALSE;
	if (pl->pl_prop != ZPROP_INVAL) {
	if (zpool_get_prop(zhp, pl->pl_prop, property,
	sizeof (property), NULL, cb->cb_literal) != 0)
	propstr = "-";
	else
	propstr = property;

	right_justify = zpool_prop_align_right(pl->pl_prop);
	} else if ((zpool_prop_feature(pl->pl_user_prop) \|\|
	zpool_prop_unsupported(pl->pl_user_prop)) &&
	zpool_prop_get_feature(zhp, pl->pl_user_prop, property,
	sizeof (property)) == 0) {
	propstr = property;
	} else {
	propstr = "-";
	}


	/*
	* If this is being called in scripted mode, or if this is the
	* last column and it is left-justified, don't include a width
	* format specifier.
	*/
	if (cb->cb_scripted \|\| (pl->pl_next == NULL && !right_justify))
	(void) printf("%s", propstr);
	else if (right_justify)
	(void) printf("%*s", (int)width, propstr);
	else
	(void) printf("%-*s", (int)width, propstr);
	}

	(void) printf("\n");
	}

	static void
	print_one_column(zpool_prop_t prop, uint64_t value, const char *str,
	boolean_t scripted, boolean_t valid, enum zfs_nicenum_format format)
	{
	char propval[64];
	boolean_t fixed;
	size_t width = zprop_width(prop, &fixed, ZFS_TYPE_POOL);

	switch (prop) {
	case ZPOOL_PROP_EXPANDSZ:
	case ZPOOL_PROP_CHECKPOINT:
	case ZPOOL_PROP_DEDUPRATIO:
	if (value == 0)
	(void) strlcpy(propval, "-", sizeof (propval));
	else
	zfs_nicenum_format(value, propval, sizeof (propval),
	format);
	break;
	case ZPOOL_PROP_FRAGMENTATION:
	if (value == ZFS_FRAG_INVALID) {
	(void) strlcpy(propval, "-", sizeof (propval));
	} else if (format == ZFS_NICENUM_RAW) {
	(void) snprintf(propval, sizeof (propval), "%llu",
	(unsigned long long)value);
	} else {
	(void) snprintf(propval, sizeof (propval), "%llu%%",
	(unsigned long long)value);
	}
	break;
	case ZPOOL_PROP_CAPACITY:
	/* capacity value is in parts-per-10,000 (aka permyriad) */
	if (format == ZFS_NICENUM_RAW)
	(void) snprintf(propval, sizeof (propval), "%llu",
	(unsigned long long)value / 100);
	else
	(void) snprintf(propval, sizeof (propval),
	value < 1000 ? "%1.2f%%" : value < 10000 ?
	"%2.1f%%" : "%3.0f%%", value / 100.0);
	break;
	case ZPOOL_PROP_HEALTH:
	width = 8;
	(void) strlcpy(propval, str, sizeof (propval));
	break;
	default:
	zfs_nicenum_format(value, propval, sizeof (propval), format);
	}

	if (!valid)
	(void) strlcpy(propval, "-", sizeof (propval));

	if (scripted)
	(void) printf("\t%s", propval);
	else
	(void) printf(" %*s", (int)width, propval);
	}

	/*
	* print static default line per vdev
	* not compatible with '-o' <proplist> option
	*/
	static void
	print_list_stats(zpool_handle_t zhp, const char name, nvlist_t *nv,
	list_cbdata_t *cb, int depth, boolean_t isspare)
	{
	nvlist_t **child;
	vdev_stat_t *vs;
	uint_t c, children;
	char *vname;
	boolean_t scripted = cb->cb_scripted;
	uint64_t islog = B_FALSE;
	char dashes = "%-s - - - - "
	"- - - - -\n";

	verify(nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &c) == 0);

	if (name != NULL) {
	boolean_t toplevel = (vs->vs_space != 0);
	uint64_t cap;
	enum zfs_nicenum_format format;
	const char *state;

	if (cb->cb_literal)
	format = ZFS_NICENUM_RAW;
	else
	format = ZFS_NICENUM_1024;

	if (strcmp(name, VDEV_TYPE_INDIRECT) == 0)
	return;

	if (scripted)
	(void) printf("\t%s", name);
	else if (strlen(name) + depth > cb->cb_namewidth)
	(void) printf("%*s%s", depth, "", name);
	else
	(void) printf("%s%s%s", depth, "", name,
	(int)(cb->cb_namewidth - strlen(name) - depth), "");

	/*
	* Print the properties for the individual vdevs. Some
	* properties are only applicable to toplevel vdevs. The
	* 'toplevel' boolean value is passed to the print_one_column()
	* to indicate that the value is valid.
	*/
	print_one_column(ZPOOL_PROP_SIZE, vs->vs_space, NULL, scripted,
	toplevel, format);
	print_one_column(ZPOOL_PROP_ALLOCATED, vs->vs_alloc, NULL,
	scripted, toplevel, format);
	print_one_column(ZPOOL_PROP_FREE, vs->vs_space - vs->vs_alloc,
	NULL, scripted, toplevel, format);
	print_one_column(ZPOOL_PROP_CHECKPOINT,
	vs->vs_checkpoint_space, NULL, scripted, toplevel, format);
	print_one_column(ZPOOL_PROP_EXPANDSZ, vs->vs_esize, NULL,
	scripted, B_TRUE, format);
	print_one_column(ZPOOL_PROP_FRAGMENTATION,
	vs->vs_fragmentation, NULL, scripted,
	(vs->vs_fragmentation != ZFS_FRAG_INVALID && toplevel),
	format);
	cap = (vs->vs_space == 0) ? 0 :
	(vs->vs_alloc * 10000 / vs->vs_space);
	print_one_column(ZPOOL_PROP_CAPACITY, cap, NULL,
	scripted, toplevel, format);
	print_one_column(ZPOOL_PROP_DEDUPRATIO, 0, NULL,
	scripted, toplevel, format);
	state = zpool_state_to_name(vs->vs_state, vs->vs_aux);
	if (isspare) {
	if (vs->vs_aux == VDEV_AUX_SPARED)
	state = "INUSE";
	else if (vs->vs_state == VDEV_STATE_HEALTHY)
	state = "AVAIL";
	}
	print_one_column(ZPOOL_PROP_HEALTH, 0, state, scripted,
	B_TRUE, format);
	(void) printf("\n");
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	return;

	/* list the normal vdevs first */
	for (c = 0; c < children; c++) {
	uint64_t ishole = B_FALSE;

	if (nvlist_lookup_uint64(child[c],
	ZPOOL_CONFIG_IS_HOLE, &ishole) == 0 && ishole)
	continue;

	if (nvlist_lookup_uint64(child[c],
	ZPOOL_CONFIG_IS_LOG, &islog) == 0 && islog)
	continue;

	if (nvlist_exists(child[c], ZPOOL_CONFIG_ALLOCATION_BIAS))
	continue;

	vname = zpool_vdev_name(g_zfs, zhp, child[c],
	cb->cb_name_flags);
	print_list_stats(zhp, vname, child[c], cb, depth + 2, B_FALSE);
	free(vname);
	}

	/* list the classes: 'logs', 'dedup', and 'special' */
	for (uint_t n = 0; n < 3; n++) {
	boolean_t printed = B_FALSE;

	for (c = 0; c < children; c++) {
	char *bias = NULL;
	char *type = NULL;

	if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
	&islog) == 0 && islog) {
	bias = VDEV_ALLOC_CLASS_LOGS;
	} else {
	(void) nvlist_lookup_string(child[c],
	ZPOOL_CONFIG_ALLOCATION_BIAS, &bias);
	(void) nvlist_lookup_string(child[c],
	ZPOOL_CONFIG_TYPE, &type);
	}
	if (bias == NULL \|\| strcmp(bias, class_name[n]) != 0)
	continue;
	if (!islog && strcmp(type, VDEV_TYPE_INDIRECT) == 0)
	continue;

	if (!printed) {
	/* LINTED E_SEC_PRINTF_VAR_FMT */
	(void) printf(dashes, cb->cb_namewidth,
	class_name[n]);
	printed = B_TRUE;
	}
	vname = zpool_vdev_name(g_zfs, zhp, child[c],
	cb->cb_name_flags);
	print_list_stats(zhp, vname, child[c], cb, depth + 2,
	B_FALSE);
	free(vname);
	}
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
	&child, &children) == 0 && children > 0) {
	/* LINTED E_SEC_PRINTF_VAR_FMT */
	(void) printf(dashes, cb->cb_namewidth, "cache");
	for (c = 0; c < children; c++) {
	vname = zpool_vdev_name(g_zfs, zhp, child[c],
	cb->cb_name_flags);
	print_list_stats(zhp, vname, child[c], cb, depth + 2,
	B_FALSE);
	free(vname);
	}
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES, &child,
	&children) == 0 && children > 0) {
	/* LINTED E_SEC_PRINTF_VAR_FMT */
	(void) printf(dashes, cb->cb_namewidth, "spare");
	for (c = 0; c < children; c++) {
	vname = zpool_vdev_name(g_zfs, zhp, child[c],
	cb->cb_name_flags);
	print_list_stats(zhp, vname, child[c], cb, depth + 2,
	B_TRUE);
	free(vname);
	}
	}
	}

	/*
	* Generic callback function to list a pool.
	*/
	static int
	list_callback(zpool_handle_t zhp, void data)
	{
	list_cbdata_t *cbp = data;

	print_pool(zhp, cbp);

	if (cbp->cb_verbose) {
	nvlist_t config, nvroot;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	&nvroot) == 0);
	print_list_stats(zhp, NULL, nvroot, cbp, 0, B_FALSE);
	}

	return (0);
	}

	/*
	* Set the minimum pool/vdev name column width. The width must be at least 9,
	* but may be as large as needed.
	*/
	static int
	get_namewidth_list(zpool_handle_t zhp, void data)
	{
	list_cbdata_t *cb = data;
	int width;

	width = get_namewidth(zhp, cb->cb_namewidth, cb->cb_name_flags,
	cb->cb_verbose);

	if (width < 9)
	width = 9;

	cb->cb_namewidth = width;

	return (0);
	}

	/*
	* zpool list [-gHLpP] [-o prop[,prop]*] [-T d\|u] [pool] ... [interval [count]]
	*
	* -g Display guid for individual vdev name.
	* -H Scripted mode. Don't display headers, and separate properties
	* by a single tab.
	* -L Follow links when resolving vdev path name.
	* -o List of properties to display. Defaults to
	* "name,size,allocated,free,expandsize,fragmentation,capacity,"
	* "dedupratio,health,altroot"
	* -p Display values in parsable (exact) format.
	* -P Display full path for vdev name.
	* -T Display a timestamp in date(1) or Unix format
	*
	* List all pools in the system, whether or not they're healthy. Output space
	* statistics for each one, as well as health status summary.
	*/
	int
	zpool_do_list(int argc, char **argv)
	{
	int c;
	int ret = 0;
	list_cbdata_t cb = { 0 };
	static char default_props[] =
	"name,size,allocated,free,checkpoint,expandsize,fragmentation,"
	"capacity,dedupratio,health,altroot";
	char *props = default_props;
	float interval = 0;
	unsigned long count = 0;
	zpool_list_t *list;
	boolean_t first = B_TRUE;

	/* check options */
	while ((c = getopt(argc, argv, ":gHLo:pPT:v")) != -1) {
	switch (c) {
	case 'g':
	cb.cb_name_flags \|= VDEV_NAME_GUID;
	break;
	case 'H':
	cb.cb_scripted = B_TRUE;
	break;
	case 'L':
	cb.cb_name_flags \|= VDEV_NAME_FOLLOW_LINKS;
	break;
	case 'o':
	props = optarg;
	break;
	case 'P':
	cb.cb_name_flags \|= VDEV_NAME_PATH;
	break;
	case 'p':
	cb.cb_literal = B_TRUE;
	break;
	case 'T':
	get_timestamp_arg(*optarg);
	break;
	case 'v':
	cb.cb_verbose = B_TRUE;
	cb.cb_namewidth = 8; /* 8 until precalc is avail */
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	get_interval_count(&argc, argv, &interval, &count);

	if (zprop_get_list(g_zfs, props, &cb.cb_proplist, ZFS_TYPE_POOL) != 0)
	usage(B_FALSE);

	for (;;) {
	if ((list = pool_list_get(argc, argv, &cb.cb_proplist,
	cb.cb_literal, &ret)) == NULL)
	return (1);

	if (pool_list_count(list) == 0)
	break;

	cb.cb_namewidth = 0;
	(void) pool_list_iter(list, B_FALSE, get_namewidth_list, &cb);

	if (timestamp_fmt != NODATE)
	print_timestamp(timestamp_fmt);

	if (!cb.cb_scripted && (first \|\| cb.cb_verbose)) {
	print_header(&cb);
	first = B_FALSE;
	}
	ret = pool_list_iter(list, B_TRUE, list_callback, &cb);

	if (interval == 0)
	break;

	if (count != 0 && --count == 0)
	break;

	pool_list_free(list);
	(void) fsleep(interval);
	}

	if (argc == 0 && !cb.cb_scripted && pool_list_count(list) == 0) {
	(void) printf(gettext("no pools available\n"));
	ret = 0;
	}

	pool_list_free(list);
	zprop_free_list(cb.cb_proplist);
	return (ret);
	}

	static int
	zpool_do_attach_or_replace(int argc, char **argv, int replacing)
	{
	boolean_t force = B_FALSE;
	boolean_t rebuild = B_FALSE;
	boolean_t wait = B_FALSE;
	int c;
	nvlist_t *nvroot;
	char poolname, old_disk, *new_disk;
	zpool_handle_t *zhp;
	nvlist_t *props = NULL;
	char *propval;
	int ret;

	/* check options */
	while ((c = getopt(argc, argv, "fo:sw")) != -1) {
	switch (c) {
	case 'f':
	force = B_TRUE;
	break;
	case 'o':
	if ((propval = strchr(optarg, '=')) == NULL) {
	(void) fprintf(stderr, gettext("missing "
	"'=' for -o option\n"));
	usage(B_FALSE);
	}
	*propval = '\0';
	propval++;

	if ((strcmp(optarg, ZPOOL_CONFIG_ASHIFT) != 0) \|\|
	(add_prop_list(optarg, propval, &props, B_TRUE)))
	usage(B_FALSE);
	break;
	case 's':
	rebuild = B_TRUE;
	break;
	case 'w':
	wait = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	usage(B_FALSE);
	}

	poolname = argv[0];

	if (argc < 2) {
	(void) fprintf(stderr,
	gettext("missing <device> specification\n"));
	usage(B_FALSE);
	}

	old_disk = argv[1];

	if (argc < 3) {
	if (!replacing) {
	(void) fprintf(stderr,
	gettext("missing <new_device> specification\n"));
	usage(B_FALSE);
	}
	new_disk = old_disk;
	argc -= 1;
	argv += 1;
	} else {
	new_disk = argv[2];
	argc -= 2;
	argv += 2;
	}

	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL) {
	nvlist_free(props);
	return (1);
	}

	if (zpool_get_config(zhp, NULL) == NULL) {
	(void) fprintf(stderr, gettext("pool '%s' is unavailable\n"),
	poolname);
	zpool_close(zhp);
	nvlist_free(props);
	return (1);
	}

	/* unless manually specified use "ashift" pool property (if set) */
	if (!nvlist_exists(props, ZPOOL_CONFIG_ASHIFT)) {
	int intval;
	zprop_source_t src;
	char strval[ZPOOL_MAXPROPLEN];

	intval = zpool_get_prop_int(zhp, ZPOOL_PROP_ASHIFT, &src);
	if (src != ZPROP_SRC_DEFAULT) {
	(void) sprintf(strval, "%" PRId32, intval);
	verify(add_prop_list(ZPOOL_CONFIG_ASHIFT, strval,
	&props, B_TRUE) == 0);
	}
	}

	nvroot = make_root_vdev(zhp, props, force, B_FALSE, replacing, B_FALSE,
	argc, argv);
	if (nvroot == NULL) {
	zpool_close(zhp);
	nvlist_free(props);
	return (1);
	}

	ret = zpool_vdev_attach(zhp, old_disk, new_disk, nvroot, replacing,
	rebuild);

	if (ret == 0 && wait)
	ret = zpool_wait(zhp,
	replacing ? ZPOOL_WAIT_REPLACE : ZPOOL_WAIT_RESILVER);

	nvlist_free(props);
	nvlist_free(nvroot);
	zpool_close(zhp);

	return (ret);
	}

	/*
	* zpool replace [-fsw] [-o property=value] <pool> <device> <new_device>
	*
	* -f Force attach, even if <new_device> appears to be in use.
	* -s Use sequential instead of healing reconstruction for resilver.
	* -o Set property=value.
	* -w Wait for replacing to complete before returning
	*
	* Replace <device> with <new_device>.
	*/
	/* ARGSUSED */
	int
	zpool_do_replace(int argc, char **argv)
	{
	return (zpool_do_attach_or_replace(argc, argv, B_TRUE));
	}

	/*
	* zpool attach [-fsw] [-o property=value] <pool> <device> <new_device>
	*
	* -f Force attach, even if <new_device> appears to be in use.
	* -s Use sequential instead of healing reconstruction for resilver.
	* -o Set property=value.
	* -w Wait for resilvering to complete before returning
	*
	* Attach <new_device> to the mirror containing <device>. If <device> is not
	* part of a mirror, then <device> will be transformed into a mirror of
	* <device> and <new_device>. In either case, <new_device> will begin life
	* with a DTL of [0, now], and will immediately begin to resilver itself.
	*/
	int
	zpool_do_attach(int argc, char **argv)
	{
	return (zpool_do_attach_or_replace(argc, argv, B_FALSE));
	}

	/*
	* zpool detach [-f] <pool> <device>
	*
	* -f Force detach of <device>, even if DTLs argue against it
	* (not supported yet)
	*
	* Detach a device from a mirror. The operation will be refused if <device>
	* is the last device in the mirror, or if the DTLs indicate that this device
	* has the only valid copy of some data.
	*/
	/* ARGSUSED */
	int
	zpool_do_detach(int argc, char **argv)
	{
	int c;
	char poolname, path;
	zpool_handle_t *zhp;
	int ret;

	/* check options */
	while ((c = getopt(argc, argv, "")) != -1) {
	switch (c) {
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	usage(B_FALSE);
	}

	if (argc < 2) {
	(void) fprintf(stderr,
	gettext("missing <device> specification\n"));
	usage(B_FALSE);
	}

	poolname = argv[0];
	path = argv[1];

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
	return (1);

	ret = zpool_vdev_detach(zhp, path);

	zpool_close(zhp);

	return (ret);
	}

	/*
	* zpool split [-gLnP] [-o prop=val] ...
	* [-o mntopt] ...
	* [-R altroot] <pool> <newpool> [<device> ...]
	*
	* -g Display guid for individual vdev name.
	* -L Follow links when resolving vdev path name.
	* -n Do not split the pool, but display the resulting layout if
	* it were to be split.
	* -o Set property=value, or set mount options.
	* -P Display full path for vdev name.
	* -R Mount the split-off pool under an alternate root.
	* -l Load encryption keys while importing.
	*
	* Splits the named pool and gives it the new pool name. Devices to be split
	* off may be listed, provided that no more than one device is specified
	* per top-level vdev mirror. The newly split pool is left in an exported
	* state unless -R is specified.
	*
	* Restrictions: the top-level of the pool pool must only be made up of
	* mirrors; all devices in the pool must be healthy; no device may be
	* undergoing a resilvering operation.
	*/
	int
	zpool_do_split(int argc, char **argv)
	{
	char srcpool, newpool, *propval;
	char *mntopts = NULL;
	splitflags_t flags;
	int c, ret = 0;
	boolean_t loadkeys = B_FALSE;
	zpool_handle_t *zhp;
	nvlist_t config, props = NULL;

	flags.dryrun = B_FALSE;
	flags.import = B_FALSE;
	flags.name_flags = 0;

	/* check options */
	while ((c = getopt(argc, argv, ":gLR:lno:P")) != -1) {
	switch (c) {
	case 'g':
	flags.name_flags \|= VDEV_NAME_GUID;
	break;
	case 'L':
	flags.name_flags \|= VDEV_NAME_FOLLOW_LINKS;
	break;
	case 'R':
	flags.import = B_TRUE;
	if (add_prop_list(
	zpool_prop_to_name(ZPOOL_PROP_ALTROOT), optarg,
	&props, B_TRUE) != 0) {
	nvlist_free(props);
	usage(B_FALSE);
	}
	break;
	case 'l':
	loadkeys = B_TRUE;
	break;
	case 'n':
	flags.dryrun = B_TRUE;
	break;
	case 'o':
	if ((propval = strchr(optarg, '=')) != NULL) {
	*propval = '\0';
	propval++;
	if (add_prop_list(optarg, propval,
	&props, B_TRUE) != 0) {
	nvlist_free(props);
	usage(B_FALSE);
	}
	} else {
	mntopts = optarg;
	}
	break;
	case 'P':
	flags.name_flags \|= VDEV_NAME_PATH;
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	break;
	}
	}

	if (!flags.import && mntopts != NULL) {
	(void) fprintf(stderr, gettext("setting mntopts is only "
	"valid when importing the pool\n"));
	usage(B_FALSE);
	}

	if (!flags.import && loadkeys) {
	(void) fprintf(stderr, gettext("loading keys is only "
	"valid when importing the pool\n"));
	usage(B_FALSE);
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("Missing pool name\n"));
	usage(B_FALSE);
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("Missing new pool name\n"));
	usage(B_FALSE);
	}

	srcpool = argv[0];
	newpool = argv[1];

	argc -= 2;
	argv += 2;

	if ((zhp = zpool_open(g_zfs, srcpool)) == NULL) {
	nvlist_free(props);
	return (1);
	}

	config = split_mirror_vdev(zhp, newpool, props, flags, argc, argv);
	if (config == NULL) {
	ret = 1;
	} else {
	if (flags.dryrun) {
	(void) printf(gettext("would create '%s' with the "
	"following layout:\n\n"), newpool);
	print_vdev_tree(NULL, newpool, config, 0, "",
	flags.name_flags);
	print_vdev_tree(NULL, "dedup", config, 0,
	VDEV_ALLOC_BIAS_DEDUP, 0);
	print_vdev_tree(NULL, "special", config, 0,
	VDEV_ALLOC_BIAS_SPECIAL, 0);
	}
	}

	zpool_close(zhp);

	if (ret != 0 \|\| flags.dryrun \|\| !flags.import) {
	nvlist_free(config);
	nvlist_free(props);
	return (ret);
	}

	/*
	* The split was successful. Now we need to open the new
	* pool and import it.
	*/
	if ((zhp = zpool_open_canfail(g_zfs, newpool)) == NULL) {
	nvlist_free(config);
	nvlist_free(props);
	return (1);
	}

	if (loadkeys) {
	ret = zfs_crypto_attempt_load_keys(g_zfs, newpool);
	if (ret != 0)
	ret = 1;
	}

	if (zpool_get_state(zhp) != POOL_STATE_UNAVAIL &&
	zpool_enable_datasets(zhp, mntopts, 0) != 0) {
	ret = 1;
	(void) fprintf(stderr, gettext("Split was successful, but "
	"the datasets could not all be mounted\n"));
	(void) fprintf(stderr, gettext("Try doing '%s' with a "
	"different altroot\n"), "zpool import");
	}
	zpool_close(zhp);
	nvlist_free(config);
	nvlist_free(props);

	return (ret);
	}



	/*
	* zpool online <pool> <device> ...
	*/
	int
	zpool_do_online(int argc, char **argv)
	{
	int c, i;
	char *poolname;
	zpool_handle_t *zhp;
	int ret = 0;
	vdev_state_t newstate;
	int flags = 0;

	/* check options */
	while ((c = getopt(argc, argv, "e")) != -1) {
	switch (c) {
	case 'e':
	flags \|= ZFS_ONLINE_EXPAND;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name\n"));
	usage(B_FALSE);
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing device name\n"));
	usage(B_FALSE);
	}

	poolname = argv[0];

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
	return (1);

	for (i = 1; i < argc; i++) {
	if (zpool_vdev_online(zhp, argv[i], flags, &newstate) == 0) {
	if (newstate != VDEV_STATE_HEALTHY) {
	(void) printf(gettext("warning: device '%s' "
	"onlined, but remains in faulted state\n"),
	argv[i]);
	if (newstate == VDEV_STATE_FAULTED)
	(void) printf(gettext("use 'zpool "
	"clear' to restore a faulted "
	"device\n"));
	else
	(void) printf(gettext("use 'zpool "
	"replace' to replace devices "
	"that are no longer present\n"));
	}
	} else {
	ret = 1;
	}
	}

	zpool_close(zhp);

	return (ret);
	}

	/*
	* zpool offline [-ft] <pool> <device> ...
	*
	* -f Force the device into a faulted state.
	*
	* -t Only take the device off-line temporarily. The offline/faulted
	* state will not be persistent across reboots.
	*/
	/* ARGSUSED */
	int
	zpool_do_offline(int argc, char **argv)
	{
	int c, i;
	char *poolname;
	zpool_handle_t *zhp;
	int ret = 0;
	boolean_t istmp = B_FALSE;
	boolean_t fault = B_FALSE;

	/* check options */
	while ((c = getopt(argc, argv, "ft")) != -1) {
	switch (c) {
	case 'f':
	fault = B_TRUE;
	break;
	case 't':
	istmp = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name\n"));
	usage(B_FALSE);
	}
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing device name\n"));
	usage(B_FALSE);
	}

	poolname = argv[0];

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
	return (1);

	for (i = 1; i < argc; i++) {
	if (fault) {
	uint64_t guid = zpool_vdev_path_to_guid(zhp, argv[i]);
	vdev_aux_t aux;
	if (istmp == B_FALSE) {
	/* Force the fault to persist across imports */
	aux = VDEV_AUX_EXTERNAL_PERSIST;
	} else {
	aux = VDEV_AUX_EXTERNAL;
	}

	if (guid == 0 \|\| zpool_vdev_fault(zhp, guid, aux) != 0)
	ret = 1;
	} else {
	if (zpool_vdev_offline(zhp, argv[i], istmp) != 0)
	ret = 1;
	}
	}

	zpool_close(zhp);

	return (ret);
	}

	/*
	* zpool clear <pool> [device]
	*
	* Clear all errors associated with a pool or a particular device.
	*/
	int
	zpool_do_clear(int argc, char **argv)
	{
	int c;
	int ret = 0;
	boolean_t dryrun = B_FALSE;
	boolean_t do_rewind = B_FALSE;
	boolean_t xtreme_rewind = B_FALSE;
	uint32_t rewind_policy = ZPOOL_NO_REWIND;
	nvlist_t *policy = NULL;
	zpool_handle_t *zhp;
	char pool, device;

	/* check options */
	while ((c = getopt(argc, argv, "FnX")) != -1) {
	switch (c) {
	case 'F':
	do_rewind = B_TRUE;
	break;
	case 'n':
	dryrun = B_TRUE;
	break;
	case 'X':
	xtreme_rewind = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name\n"));
	usage(B_FALSE);
	}

	if (argc > 2) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	if ((dryrun \|\| xtreme_rewind) && !do_rewind) {
	(void) fprintf(stderr,
	gettext("-n or -X only meaningful with -F\n"));
	usage(B_FALSE);
	}
	if (dryrun)
	rewind_policy = ZPOOL_TRY_REWIND;
	else if (do_rewind)
	rewind_policy = ZPOOL_DO_REWIND;
	if (xtreme_rewind)
	rewind_policy \|= ZPOOL_EXTREME_REWIND;

	/* In future, further rewind policy choices can be passed along here */
	if (nvlist_alloc(&policy, NV_UNIQUE_NAME, 0) != 0 \|\|
	nvlist_add_uint32(policy, ZPOOL_LOAD_REWIND_POLICY,
	rewind_policy) != 0) {
	return (1);
	}

	pool = argv[0];
	device = argc == 2 ? argv[1] : NULL;

	if ((zhp = zpool_open_canfail(g_zfs, pool)) == NULL) {
	nvlist_free(policy);
	return (1);
	}

	if (zpool_clear(zhp, device, policy) != 0)
	ret = 1;

	zpool_close(zhp);

	nvlist_free(policy);

	return (ret);
	}

	/*
	* zpool reguid <pool>
	*/
	int
	zpool_do_reguid(int argc, char **argv)
	{
	int c;
	char *poolname;
	zpool_handle_t *zhp;
	int ret = 0;

	/* check options */
	while ((c = getopt(argc, argv, "")) != -1) {
	switch (c) {
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name\n"));
	usage(B_FALSE);
	}

	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	poolname = argv[0];
	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
	return (1);

	ret = zpool_reguid(zhp);

	zpool_close(zhp);
	return (ret);
	}


	/*
	* zpool reopen <pool>
	*
	* Reopen the pool so that the kernel can update the sizes of all vdevs.
	*/
	int
	zpool_do_reopen(int argc, char **argv)
	{
	int c;
	int ret = 0;
	boolean_t scrub_restart = B_TRUE;

	/* check options */
	while ((c = getopt(argc, argv, "n")) != -1) {
	switch (c) {
	case 'n':
	scrub_restart = B_FALSE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	/* if argc == 0 we will execute zpool_reopen_one on all pools */
	ret = for_each_pool(argc, argv, B_TRUE, NULL, B_FALSE, zpool_reopen_one,
	&scrub_restart);

	return (ret);
	}

	typedef struct scrub_cbdata {
	int cb_type;
	pool_scrub_cmd_t cb_scrub_cmd;
	} scrub_cbdata_t;

	static boolean_t
	zpool_has_checkpoint(zpool_handle_t *zhp)
	{
	nvlist_t config, nvroot;

	config = zpool_get_config(zhp, NULL);

	if (config != NULL) {
	pool_checkpoint_stat_t *pcs = NULL;
	uint_t c;

	nvroot = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE);
	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_CHECKPOINT_STATS, (uint64_t **)&pcs, &c);

	if (pcs == NULL \|\| pcs->pcs_state == CS_NONE)
	return (B_FALSE);

	assert(pcs->pcs_state == CS_CHECKPOINT_EXISTS \|\|
	pcs->pcs_state == CS_CHECKPOINT_DISCARDING);
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	static int
	scrub_callback(zpool_handle_t zhp, void data)
	{
	scrub_cbdata_t *cb = data;
	int err;

	/*
	* Ignore faulted pools.
	*/
	if (zpool_get_state(zhp) == POOL_STATE_UNAVAIL) {
	(void) fprintf(stderr, gettext("cannot scan '%s': pool is "
	"currently unavailable\n"), zpool_get_name(zhp));
	return (1);
	}

	err = zpool_scan(zhp, cb->cb_type, cb->cb_scrub_cmd);

	if (err == 0 && zpool_has_checkpoint(zhp) &&
	cb->cb_type == POOL_SCAN_SCRUB) {
	(void) printf(gettext("warning: will not scrub state that "
	"belongs to the checkpoint of pool '%s'\n"),
	zpool_get_name(zhp));
	}

	return (err != 0);
	}

	static int
	wait_callback(zpool_handle_t zhp, void data)
	{
	zpool_wait_activity_t *act = data;
	return (zpool_wait(zhp, *act));
	}

	/*
	* zpool scrub [-s \| -p] [-w] <pool> ...
	*
	* -s Stop. Stops any in-progress scrub.
	* -p Pause. Pause in-progress scrub.
	* -w Wait. Blocks until scrub has completed.
	*/
	int
	zpool_do_scrub(int argc, char **argv)
	{
	int c;
	scrub_cbdata_t cb;
	boolean_t wait = B_FALSE;
	int error;

	cb.cb_type = POOL_SCAN_SCRUB;
	cb.cb_scrub_cmd = POOL_SCRUB_NORMAL;

	/* check options */
	while ((c = getopt(argc, argv, "spw")) != -1) {
	switch (c) {
	case 's':
	cb.cb_type = POOL_SCAN_NONE;
	break;
	case 'p':
	cb.cb_scrub_cmd = POOL_SCRUB_PAUSE;
	break;
	case 'w':
	wait = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	if (cb.cb_type == POOL_SCAN_NONE &&
	cb.cb_scrub_cmd == POOL_SCRUB_PAUSE) {
	(void) fprintf(stderr, gettext("invalid option combination: "
	"-s and -p are mutually exclusive\n"));
	usage(B_FALSE);
	}

	if (wait && (cb.cb_type == POOL_SCAN_NONE \|\|
	cb.cb_scrub_cmd == POOL_SCRUB_PAUSE)) {
	(void) fprintf(stderr, gettext("invalid option combination: "
	"-w cannot be used with -p or -s\n"));
	usage(B_FALSE);
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	usage(B_FALSE);
	}

	error = for_each_pool(argc, argv, B_TRUE, NULL, B_FALSE,
	scrub_callback, &cb);

	if (wait && !error) {
	zpool_wait_activity_t act = ZPOOL_WAIT_SCRUB;
	error = for_each_pool(argc, argv, B_TRUE, NULL, B_FALSE,
	wait_callback, &act);
	}

	return (error);
	}

	/*
	* zpool resilver <pool> ...
	*
	* Restarts any in-progress resilver
	*/
	int
	zpool_do_resilver(int argc, char **argv)
	{
	int c;
	scrub_cbdata_t cb;

	cb.cb_type = POOL_SCAN_RESILVER;
	cb.cb_scrub_cmd = POOL_SCRUB_NORMAL;

	/* check options */
	while ((c = getopt(argc, argv, "")) != -1) {
	switch (c) {
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	usage(B_FALSE);
	}

	return (for_each_pool(argc, argv, B_TRUE, NULL, B_FALSE,
	scrub_callback, &cb));
	}

	/*
	* zpool trim [-d] [-r <rate>] [-c \| -s] <pool> [<device> ...]
	*
	* -c Cancel. Ends any in-progress trim.
	* -d Secure trim. Requires kernel and device support.
	* -r <rate> Sets the TRIM rate in bytes (per second). Supports
	* adding a multiplier suffix such as 'k' or 'm'.
	* -s Suspend. TRIM can then be restarted with no flags.
	* -w Wait. Blocks until trimming has completed.
	*/
	int
	zpool_do_trim(int argc, char **argv)
	{
	struct option long_options[] = {
	{"cancel", no_argument, NULL, 'c'},
	{"secure", no_argument, NULL, 'd'},
	{"rate", required_argument, NULL, 'r'},
	{"suspend", no_argument, NULL, 's'},
	{"wait", no_argument, NULL, 'w'},
	{0, 0, 0, 0}
	};

	pool_trim_func_t cmd_type = POOL_TRIM_START;
	uint64_t rate = 0;
	boolean_t secure = B_FALSE;
	boolean_t wait = B_FALSE;

	int c;
	while ((c = getopt_long(argc, argv, "cdr:sw", long_options, NULL))
	!= -1) {
	switch (c) {
	case 'c':
	if (cmd_type != POOL_TRIM_START &&
	cmd_type != POOL_TRIM_CANCEL) {
	(void) fprintf(stderr, gettext("-c cannot be "
	"combined with other options\n"));
	usage(B_FALSE);
	}
	cmd_type = POOL_TRIM_CANCEL;
	break;
	case 'd':
	if (cmd_type != POOL_TRIM_START) {
	(void) fprintf(stderr, gettext("-d cannot be "
	"combined with the -c or -s options\n"));
	usage(B_FALSE);
	}
	secure = B_TRUE;
	break;
	case 'r':
	if (cmd_type != POOL_TRIM_START) {
	(void) fprintf(stderr, gettext("-r cannot be "
	"combined with the -c or -s options\n"));
	usage(B_FALSE);
	}
	if (zfs_nicestrtonum(NULL, optarg, &rate) == -1) {
	(void) fprintf(stderr,
	gettext("invalid value for rate\n"));
	usage(B_FALSE);
	}
	break;
	case 's':
	if (cmd_type != POOL_TRIM_START &&
	cmd_type != POOL_TRIM_SUSPEND) {
	(void) fprintf(stderr, gettext("-s cannot be "
	"combined with other options\n"));
	usage(B_FALSE);
	}
	cmd_type = POOL_TRIM_SUSPEND;
	break;
	case 'w':
	wait = B_TRUE;
	break;
	case '?':
	if (optopt != 0) {
	(void) fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	} else {
	(void) fprintf(stderr,
	gettext("invalid option '%s'\n"),
	argv[optind - 1]);
	}
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing pool name argument\n"));
	usage(B_FALSE);
	return (-1);
	}

	if (wait && (cmd_type != POOL_TRIM_START)) {
	(void) fprintf(stderr, gettext("-w cannot be used with -c or "
	"-s\n"));
	usage(B_FALSE);
	}

	char *poolname = argv[0];
	zpool_handle_t *zhp = zpool_open(g_zfs, poolname);
	if (zhp == NULL)
	return (-1);

	trimflags_t trim_flags = {
	.secure = secure,
	.rate = rate,
	.wait = wait,
	};

	nvlist_t *vdevs = fnvlist_alloc();
	if (argc == 1) {
	/* no individual leaf vdevs specified, so add them all */
	nvlist_t *config = zpool_get_config(zhp, NULL);
	nvlist_t *nvroot = fnvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_VDEV_TREE);
	zpool_collect_leaves(zhp, nvroot, vdevs);
	trim_flags.fullpool = B_TRUE;
	} else {
	trim_flags.fullpool = B_FALSE;
	for (int i = 1; i < argc; i++) {
	fnvlist_add_boolean(vdevs, argv[i]);
	}
	}

	int error = zpool_trim(zhp, cmd_type, vdevs, &trim_flags);

	fnvlist_free(vdevs);
	zpool_close(zhp);

	return (error);
	}

	/*
	* Converts a total number of seconds to a human readable string broken
	* down in to days/hours/minutes/seconds.
	*/
	static void
	secs_to_dhms(uint64_t total, char *buf)
	{
	uint64_t days = total / 60 / 60 / 24;
	uint64_t hours = (total / 60 / 60) % 24;
	uint64_t mins = (total / 60) % 60;
	uint64_t secs = (total % 60);

	if (days > 0) {
	(void) sprintf(buf, "%llu days %02llu:%02llu:%02llu",
	(u_longlong_t)days, (u_longlong_t)hours,
	(u_longlong_t)mins, (u_longlong_t)secs);
	} else {
	(void) sprintf(buf, "%02llu:%02llu:%02llu",
	(u_longlong_t)hours, (u_longlong_t)mins,
	(u_longlong_t)secs);
	}
	}

	/*
	* Print out detailed scrub status.
	*/
	static void
	print_scan_scrub_resilver_status(pool_scan_stat_t *ps)
	{
	time_t start, end, pause;
	uint64_t pass_scanned, scanned, pass_issued, issued, total;
	uint64_t elapsed, scan_rate, issue_rate;
	double fraction_done;
	char processed_buf[7], scanned_buf[7], issued_buf[7], total_buf[7];
	char srate_buf[7], irate_buf[7], time_buf[32];

	printf(" ");
	printf_color(ANSI_BOLD, gettext("scan:"));
	printf(" ");

	/* If there's never been a scan, there's not much to say. */
	if (ps == NULL \|\| ps->pss_func == POOL_SCAN_NONE \|\|
	ps->pss_func >= POOL_SCAN_FUNCS) {
	(void) printf(gettext("none requested\n"));
	return;
	}

	start = ps->pss_start_time;
	end = ps->pss_end_time;
	pause = ps->pss_pass_scrub_pause;

	zfs_nicebytes(ps->pss_processed, processed_buf, sizeof (processed_buf));

	assert(ps->pss_func == POOL_SCAN_SCRUB \|\|
	ps->pss_func == POOL_SCAN_RESILVER);

	/* Scan is finished or canceled. */
	if (ps->pss_state == DSS_FINISHED) {
	secs_to_dhms(end - start, time_buf);

	if (ps->pss_func == POOL_SCAN_SCRUB) {
	(void) printf(gettext("scrub repaired %s "
	"in %s with %llu errors on %s"), processed_buf,
	time_buf, (u_longlong_t)ps->pss_errors,
	ctime(&end));
	} else if (ps->pss_func == POOL_SCAN_RESILVER) {
	(void) printf(gettext("resilvered %s "
	"in %s with %llu errors on %s"), processed_buf,
	time_buf, (u_longlong_t)ps->pss_errors,
	ctime(&end));
	}
	return;
	} else if (ps->pss_state == DSS_CANCELED) {
	if (ps->pss_func == POOL_SCAN_SCRUB) {
	(void) printf(gettext("scrub canceled on %s"),
	ctime(&end));
	} else if (ps->pss_func == POOL_SCAN_RESILVER) {
	(void) printf(gettext("resilver canceled on %s"),
	ctime(&end));
	}
	return;
	}

	assert(ps->pss_state == DSS_SCANNING);

	/* Scan is in progress. Resilvers can't be paused. */
	if (ps->pss_func == POOL_SCAN_SCRUB) {
	if (pause == 0) {
	(void) printf(gettext("scrub in progress since %s"),
	ctime(&start));
	} else {
	(void) printf(gettext("scrub paused since %s"),
	ctime(&pause));
	(void) printf(gettext("\tscrub started on %s"),
	ctime(&start));
	}
	} else if (ps->pss_func == POOL_SCAN_RESILVER) {
	(void) printf(gettext("resilver in progress since %s"),
	ctime(&start));
	}

	scanned = ps->pss_examined;
	pass_scanned = ps->pss_pass_exam;
	issued = ps->pss_issued;
	pass_issued = ps->pss_pass_issued;
	total = ps->pss_to_examine;

	/* we are only done with a block once we have issued the IO for it */
	fraction_done = (double)issued / total;

	/* elapsed time for this pass, rounding up to 1 if it's 0 */
	elapsed = time(NULL) - ps->pss_pass_start;
	elapsed -= ps->pss_pass_scrub_spent_paused;
	elapsed = (elapsed != 0) ? elapsed : 1;

	scan_rate = pass_scanned / elapsed;
	issue_rate = pass_issued / elapsed;
	uint64_t total_secs_left = (issue_rate != 0 && total >= issued) ?
	((total - issued) / issue_rate) : UINT64_MAX;
	secs_to_dhms(total_secs_left, time_buf);

	/* format all of the numbers we will be reporting */
	zfs_nicebytes(scanned, scanned_buf, sizeof (scanned_buf));
	zfs_nicebytes(issued, issued_buf, sizeof (issued_buf));
	zfs_nicebytes(total, total_buf, sizeof (total_buf));
	zfs_nicebytes(scan_rate, srate_buf, sizeof (srate_buf));
	zfs_nicebytes(issue_rate, irate_buf, sizeof (irate_buf));

	/* do not print estimated time if we have a paused scrub */
	if (pause == 0) {
	(void) printf(gettext("\t%s scanned at %s/s, "
	"%s issued at %s/s, %s total\n"),
	scanned_buf, srate_buf, issued_buf, irate_buf, total_buf);
	} else {
	(void) printf(gettext("\t%s scanned, %s issued, %s total\n"),
	scanned_buf, issued_buf, total_buf);
	}

	if (ps->pss_func == POOL_SCAN_RESILVER) {
	(void) printf(gettext("\t%s resilvered, %.2f%% done"),
	processed_buf, 100 * fraction_done);
	} else if (ps->pss_func == POOL_SCAN_SCRUB) {
	(void) printf(gettext("\t%s repaired, %.2f%% done"),
	processed_buf, 100 * fraction_done);
	}

	if (pause == 0) {
	if (total_secs_left != UINT64_MAX &&
	issue_rate >= 10 * 1024 * 1024) {
	(void) printf(gettext(", %s to go\n"), time_buf);
	} else {
	(void) printf(gettext(", no estimated "
	"completion time\n"));
	}
	} else {
	(void) printf(gettext("\n"));
	}
	}

	static void
	print_rebuild_status_impl(vdev_rebuild_stat_t vrs, char vdev_name)
	{
	if (vrs == NULL \|\| vrs->vrs_state == VDEV_REBUILD_NONE)
	return;

	printf(" ");
	printf_color(ANSI_BOLD, gettext("scan:"));
	printf(" ");

	uint64_t bytes_scanned = vrs->vrs_bytes_scanned;
	uint64_t bytes_issued = vrs->vrs_bytes_issued;
	uint64_t bytes_rebuilt = vrs->vrs_bytes_rebuilt;
	uint64_t bytes_est = vrs->vrs_bytes_est;
	uint64_t scan_rate = (vrs->vrs_pass_bytes_scanned /
	(vrs->vrs_pass_time_ms + 1)) * 1000;
	uint64_t issue_rate = (vrs->vrs_pass_bytes_issued /
	(vrs->vrs_pass_time_ms + 1)) * 1000;
	double scan_pct = MIN((double)bytes_scanned * 100 /
	(bytes_est + 1), 100);

	/* Format all of the numbers we will be reporting */
	char bytes_scanned_buf[7], bytes_issued_buf[7];
	char bytes_rebuilt_buf[7], bytes_est_buf[7];
	char scan_rate_buf[7], issue_rate_buf[7], time_buf[32];
	zfs_nicebytes(bytes_scanned, bytes_scanned_buf,
	sizeof (bytes_scanned_buf));
	zfs_nicebytes(bytes_issued, bytes_issued_buf,
	sizeof (bytes_issued_buf));
	zfs_nicebytes(bytes_rebuilt, bytes_rebuilt_buf,
	sizeof (bytes_rebuilt_buf));
	zfs_nicebytes(bytes_est, bytes_est_buf, sizeof (bytes_est_buf));
	zfs_nicebytes(scan_rate, scan_rate_buf, sizeof (scan_rate_buf));
	zfs_nicebytes(issue_rate, issue_rate_buf, sizeof (issue_rate_buf));

	time_t start = vrs->vrs_start_time;
	time_t end = vrs->vrs_end_time;

	/* Rebuild is finished or canceled. */
	if (vrs->vrs_state == VDEV_REBUILD_COMPLETE) {
	secs_to_dhms(vrs->vrs_scan_time_ms / 1000, time_buf);
	(void) printf(gettext("resilvered (%s) %s in %s "
	"with %llu errors on %s"), vdev_name, bytes_rebuilt_buf,
	time_buf, (u_longlong_t)vrs->vrs_errors, ctime(&end));
	return;
	} else if (vrs->vrs_state == VDEV_REBUILD_CANCELED) {
	(void) printf(gettext("resilver (%s) canceled on %s"),
	vdev_name, ctime(&end));
	return;
	} else if (vrs->vrs_state == VDEV_REBUILD_ACTIVE) {
	(void) printf(gettext("resilver (%s) in progress since %s"),
	vdev_name, ctime(&start));
	}

	assert(vrs->vrs_state == VDEV_REBUILD_ACTIVE);

	secs_to_dhms(MAX((int64_t)bytes_est - (int64_t)bytes_scanned, 0) /
	MAX(scan_rate, 1), time_buf);

	(void) printf(gettext("\t%s scanned at %s/s, %s issued %s/s, "
	"%s total\n"), bytes_scanned_buf, scan_rate_buf,
	bytes_issued_buf, issue_rate_buf, bytes_est_buf);
	(void) printf(gettext("\t%s resilvered, %.2f%% done"),
	bytes_rebuilt_buf, scan_pct);

	if (vrs->vrs_state == VDEV_REBUILD_ACTIVE) {
	if (scan_rate >= 10 * 1024 * 1024) {
	(void) printf(gettext(", %s to go\n"), time_buf);
	} else {
	(void) printf(gettext(", no estimated "
	"completion time\n"));
	}
	} else {
	(void) printf(gettext("\n"));
	}
	}

	/*
	* Print rebuild status for top-level vdevs.
	*/
	static void
	print_rebuild_status(zpool_handle_t zhp, nvlist_t nvroot)
	{
	nvlist_t **child;
	uint_t children;

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	children = 0;

	for (uint_t c = 0; c < children; c++) {
	vdev_rebuild_stat_t *vrs;
	uint_t i;

	if (nvlist_lookup_uint64_array(child[c],
	ZPOOL_CONFIG_REBUILD_STATS, (uint64_t **)&vrs, &i) == 0) {
	char *name = zpool_vdev_name(g_zfs, zhp,
	child[c], VDEV_NAME_TYPE_ID);
	print_rebuild_status_impl(vrs, name);
	free(name);
	}
	}
	}

	/*
	* As we don't scrub checkpointed blocks, we want to warn the user that we
	* skipped scanning some blocks if a checkpoint exists or existed at any
	* time during the scan. If a sequential instead of healing reconstruction
	* was performed then the blocks were reconstructed. However, their checksums
	* have not been verified so we still print the warning.
	*/
	static void
	print_checkpoint_scan_warning(pool_scan_stat_t ps, pool_checkpoint_stat_t pcs)
	{
	if (ps == NULL \|\| pcs == NULL)
	return;

	if (pcs->pcs_state == CS_NONE \|\|
	pcs->pcs_state == CS_CHECKPOINT_DISCARDING)
	return;

	assert(pcs->pcs_state == CS_CHECKPOINT_EXISTS);

	if (ps->pss_state == DSS_NONE)
	return;

	if ((ps->pss_state == DSS_FINISHED \|\| ps->pss_state == DSS_CANCELED) &&
	ps->pss_end_time < pcs->pcs_start_time)
	return;

	if (ps->pss_state == DSS_FINISHED \|\| ps->pss_state == DSS_CANCELED) {
	(void) printf(gettext(" scan warning: skipped blocks "
	"that are only referenced by the checkpoint.\n"));
	} else {
	assert(ps->pss_state == DSS_SCANNING);
	(void) printf(gettext(" scan warning: skipping blocks "
	"that are only referenced by the checkpoint.\n"));
	}
	}

	/*
	* Returns B_TRUE if there is an active rebuild in progress. Otherwise,
	* B_FALSE is returned and 'rebuild_end_time' is set to the end time for
	* the last completed (or cancelled) rebuild.
	*/
	static boolean_t
	check_rebuilding(nvlist_t nvroot, uint64_t rebuild_end_time)
	{
	nvlist_t **child;
	uint_t children;
	boolean_t rebuilding = B_FALSE;
	uint64_t end_time = 0;

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	children = 0;

	for (uint_t c = 0; c < children; c++) {
	vdev_rebuild_stat_t *vrs;
	uint_t i;

	if (nvlist_lookup_uint64_array(child[c],
	ZPOOL_CONFIG_REBUILD_STATS, (uint64_t **)&vrs, &i) == 0) {

	if (vrs->vrs_end_time > end_time)
	end_time = vrs->vrs_end_time;

	if (vrs->vrs_state == VDEV_REBUILD_ACTIVE) {
	rebuilding = B_TRUE;
	end_time = 0;
	break;
	}
	}
	}

	if (rebuild_end_time != NULL)
	*rebuild_end_time = end_time;

	return (rebuilding);
	}

	/*
	* Print the scan status.
	*/
	static void
	print_scan_status(zpool_handle_t zhp, nvlist_t nvroot)
	{
	uint64_t rebuild_end_time = 0, resilver_end_time = 0;
	boolean_t have_resilver = B_FALSE, have_scrub = B_FALSE;
	boolean_t active_resilver = B_FALSE;
	pool_checkpoint_stat_t *pcs = NULL;
	pool_scan_stat_t *ps = NULL;
	uint_t c;

	if (nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_SCAN_STATS,
	(uint64_t **)&ps, &c) == 0) {
	if (ps->pss_func == POOL_SCAN_RESILVER) {
	resilver_end_time = ps->pss_end_time;
	active_resilver = (ps->pss_state == DSS_SCANNING);
	}

	have_resilver = (ps->pss_func == POOL_SCAN_RESILVER);
	have_scrub = (ps->pss_func == POOL_SCAN_SCRUB);
	}

	boolean_t active_rebuild = check_rebuilding(nvroot, &rebuild_end_time);
	boolean_t have_rebuild = (active_rebuild \|\| (rebuild_end_time > 0));

	/* Always print the scrub status when available. */
	if (have_scrub)
	print_scan_scrub_resilver_status(ps);

	/*
	* When there is an active resilver or rebuild print its status.
	* Otherwise print the status of the last resilver or rebuild.
	*/
	if (active_resilver \|\| (!active_rebuild && have_resilver &&
	resilver_end_time && resilver_end_time > rebuild_end_time)) {
	print_scan_scrub_resilver_status(ps);
	} else if (active_rebuild \|\| (!active_resilver && have_rebuild &&
	rebuild_end_time && rebuild_end_time > resilver_end_time)) {
	print_rebuild_status(zhp, nvroot);
	}

	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_CHECKPOINT_STATS, (uint64_t **)&pcs, &c);
	print_checkpoint_scan_warning(ps, pcs);
	}

	/*
	* Print out detailed removal status.
	*/
	static void
	print_removal_status(zpool_handle_t zhp, pool_removal_stat_t prs)
	{
	char copied_buf[7], examined_buf[7], total_buf[7], rate_buf[7];
	time_t start, end;
	nvlist_t config, nvroot;
	nvlist_t **child;
	uint_t children;
	char *vdev_name;

	if (prs == NULL \|\| prs->prs_state == DSS_NONE)
	return;

	/*
	* Determine name of vdev.
	*/
	config = zpool_get_config(zhp, NULL);
	nvroot = fnvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_VDEV_TREE);
	verify(nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	&child, &children) == 0);
	assert(prs->prs_removing_vdev < children);
	vdev_name = zpool_vdev_name(g_zfs, zhp,
	child[prs->prs_removing_vdev], B_TRUE);

	printf_color(ANSI_BOLD, gettext("remove: "));

	start = prs->prs_start_time;
	end = prs->prs_end_time;
	zfs_nicenum(prs->prs_copied, copied_buf, sizeof (copied_buf));

	/*
	* Removal is finished or canceled.
	*/
	if (prs->prs_state == DSS_FINISHED) {
	uint64_t minutes_taken = (end - start) / 60;

	(void) printf(gettext("Removal of vdev %llu copied %s "
	"in %lluh%um, completed on %s"),
	(longlong_t)prs->prs_removing_vdev,
	copied_buf,
	(u_longlong_t)(minutes_taken / 60),
	(uint_t)(minutes_taken % 60),
	ctime((time_t *)&end));
	} else if (prs->prs_state == DSS_CANCELED) {
	(void) printf(gettext("Removal of %s canceled on %s"),
	vdev_name, ctime(&end));
	} else {
	uint64_t copied, total, elapsed, mins_left, hours_left;
	double fraction_done;
	uint_t rate;

	assert(prs->prs_state == DSS_SCANNING);

	/*
	* Removal is in progress.
	*/
	(void) printf(gettext(
	"Evacuation of %s in progress since %s"),
	vdev_name, ctime(&start));

	copied = prs->prs_copied > 0 ? prs->prs_copied : 1;
	total = prs->prs_to_copy;
	fraction_done = (double)copied / total;

	/* elapsed time for this pass */
	elapsed = time(NULL) - prs->prs_start_time;
	elapsed = elapsed > 0 ? elapsed : 1;
	rate = copied / elapsed;
	rate = rate > 0 ? rate : 1;
	mins_left = ((total - copied) / rate) / 60;
	hours_left = mins_left / 60;

	zfs_nicenum(copied, examined_buf, sizeof (examined_buf));
	zfs_nicenum(total, total_buf, sizeof (total_buf));
	zfs_nicenum(rate, rate_buf, sizeof (rate_buf));

	/*
	* do not print estimated time if hours_left is more than
	* 30 days
	*/
	(void) printf(gettext(
	"\t%s copied out of %s at %s/s, %.2f%% done"),
	examined_buf, total_buf, rate_buf, 100 * fraction_done);
	if (hours_left < (30 * 24)) {
	(void) printf(gettext(", %lluh%um to go\n"),
	(u_longlong_t)hours_left, (uint_t)(mins_left % 60));
	} else {
	(void) printf(gettext(
	", (copy is slow, no estimated time)\n"));
	}
	}
	free(vdev_name);

	if (prs->prs_mapping_memory > 0) {
	char mem_buf[7];
	zfs_nicenum(prs->prs_mapping_memory, mem_buf, sizeof (mem_buf));
	(void) printf(gettext(
	"\t%s memory used for removed device mappings\n"),
	mem_buf);
	}
	}

	static void
	print_checkpoint_status(pool_checkpoint_stat_t *pcs)
	{
	time_t start;
	char space_buf[7];

	if (pcs == NULL \|\| pcs->pcs_state == CS_NONE)
	return;

	(void) printf(gettext("checkpoint: "));

	start = pcs->pcs_start_time;
	zfs_nicenum(pcs->pcs_space, space_buf, sizeof (space_buf));

	if (pcs->pcs_state == CS_CHECKPOINT_EXISTS) {
	char *date = ctime(&start);

	/*
	* ctime() adds a newline at the end of the generated
	* string, thus the weird format specifier and the
	* strlen() call used to chop it off from the output.
	*/
	(void) printf(gettext("created %.*s, consumes %s\n"),
	(int)(strlen(date) - 1), date, space_buf);
	return;
	}

	assert(pcs->pcs_state == CS_CHECKPOINT_DISCARDING);

	(void) printf(gettext("discarding, %s remaining.\n"),
	space_buf);
	}

	static void
	print_error_log(zpool_handle_t *zhp)
	{
	nvlist_t *nverrlist = NULL;
	nvpair_t *elem;
	char *pathname;
	size_t len = MAXPATHLEN * 2;

	if (zpool_get_errlog(zhp, &nverrlist) != 0)
	return;

	(void) printf("errors: Permanent errors have been "
	"detected in the following files:\n\n");

	pathname = safe_malloc(len);
	elem = NULL;
	while ((elem = nvlist_next_nvpair(nverrlist, elem)) != NULL) {
	nvlist_t *nv;
	uint64_t dsobj, obj;

	verify(nvpair_value_nvlist(elem, &nv) == 0);
	verify(nvlist_lookup_uint64(nv, ZPOOL_ERR_DATASET,
	&dsobj) == 0);
	verify(nvlist_lookup_uint64(nv, ZPOOL_ERR_OBJECT,
	&obj) == 0);
	zpool_obj_to_path(zhp, dsobj, obj, pathname, len);
	(void) printf("%7s %s\n", "", pathname);
	}
	free(pathname);
	nvlist_free(nverrlist);
	}

	static void
	print_spares(zpool_handle_t zhp, status_cbdata_t cb, nvlist_t **spares,
	uint_t nspares)
	{
	uint_t i;
	char *name;

	if (nspares == 0)
	return;

	(void) printf(gettext("\tspares\n"));

	for (i = 0; i < nspares; i++) {
	name = zpool_vdev_name(g_zfs, zhp, spares[i],
	cb->cb_name_flags);
	print_status_config(zhp, cb, name, spares[i], 2, B_TRUE, NULL);
	free(name);
	}
	}

	static void
	print_l2cache(zpool_handle_t zhp, status_cbdata_t cb, nvlist_t **l2cache,
	uint_t nl2cache)
	{
	uint_t i;
	char *name;

	if (nl2cache == 0)
	return;

	(void) printf(gettext("\tcache\n"));

	for (i = 0; i < nl2cache; i++) {
	name = zpool_vdev_name(g_zfs, zhp, l2cache[i],
	cb->cb_name_flags);
	print_status_config(zhp, cb, name, l2cache[i], 2,
	B_FALSE, NULL);
	free(name);
	}
	}

	static void
	print_dedup_stats(nvlist_t *config)
	{
	ddt_histogram_t *ddh;
	ddt_stat_t *dds;
	ddt_object_t *ddo;
	uint_t c;
	char dspace[6], mspace[6];

	/*
	* If the pool was faulted then we may not have been able to
	* obtain the config. Otherwise, if we have anything in the dedup
	* table continue processing the stats.
	*/
	if (nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_DDT_OBJ_STATS,
	(uint64_t **)&ddo, &c) != 0)
	return;

	(void) printf("\n");
	(void) printf(gettext(" dedup: "));
	if (ddo->ddo_count == 0) {
	(void) printf(gettext("no DDT entries\n"));
	return;
	}

	zfs_nicebytes(ddo->ddo_dspace, dspace, sizeof (dspace));
	zfs_nicebytes(ddo->ddo_mspace, mspace, sizeof (mspace));
	(void) printf("DDT entries %llu, size %s on disk, %s in core\n",
	(u_longlong_t)ddo->ddo_count,
	dspace,
	mspace);

	verify(nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_DDT_STATS,
	(uint64_t **)&dds, &c) == 0);
	verify(nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_DDT_HISTOGRAM,
	(uint64_t **)&ddh, &c) == 0);
	zpool_dump_ddt(dds, ddh);
	}

	/*
	* Display a summary of pool status. Displays a summary such as:
	*
	* pool: tank
	* status: DEGRADED
	* reason: One or more devices ...
	* see: https://openzfs.github.io/openzfs-docs/msg/ZFS-xxxx-01
	* config:
	* mirror DEGRADED
	* c1t0d0 OK
	* c2t0d0 UNAVAIL
	*
	* When given the '-v' option, we print out the complete config. If the '-e'
	* option is specified, then we print out error rate information as well.
	*/
	static int
	status_callback(zpool_handle_t zhp, void data)
	{
	status_cbdata_t *cbp = data;
	nvlist_t config, nvroot;
	char *msgid;
	zpool_status_t reason;
	zpool_errata_t errata;
	const char *health;
	uint_t c;
	vdev_stat_t *vs;

	config = zpool_get_config(zhp, NULL);
	reason = zpool_get_status(zhp, &msgid, &errata);

	cbp->cb_count++;

	/*
	* If we were given 'zpool status -x', only report those pools with
	* problems.
	*/
	if (cbp->cb_explain &&
	(reason == ZPOOL_STATUS_OK \|\|
	reason == ZPOOL_STATUS_VERSION_OLDER \|\|
	reason == ZPOOL_STATUS_FEAT_DISABLED \|\|
	reason == ZPOOL_STATUS_COMPATIBILITY_ERR \|\|
	reason == ZPOOL_STATUS_INCOMPATIBLE_FEAT)) {
	if (!cbp->cb_allpools) {
	(void) printf(gettext("pool '%s' is healthy\n"),
	zpool_get_name(zhp));
	if (cbp->cb_first)
	cbp->cb_first = B_FALSE;
	}
	return (0);
	}

	if (cbp->cb_first)
	cbp->cb_first = B_FALSE;
	else
	(void) printf("\n");

	nvroot = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE);
	verify(nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &c) == 0);

	health = zpool_get_state_str(zhp);

	printf(" ");
	printf_color(ANSI_BOLD, gettext("pool:"));
	printf(" %s\n", zpool_get_name(zhp));
	printf(" ");
	printf_color(ANSI_BOLD, gettext("state: "));

	printf_color(health_str_to_color(health), "%s", health);

	printf("\n");

	switch (reason) {
	case ZPOOL_STATUS_MISSING_DEV_R:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices could "
	"not be opened. Sufficient replicas exist for\n\tthe pool "
	"to continue functioning in a degraded state.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Attach the missing device "
	"and online it using 'zpool online'.\n"));
	break;

	case ZPOOL_STATUS_MISSING_DEV_NR:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices could "
	"not be opened. There are insufficient\n\treplicas for the"
	" pool to continue functioning.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Attach the missing device "
	"and online it using 'zpool online'.\n"));
	break;

	case ZPOOL_STATUS_CORRUPT_LABEL_R:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices could "
	"not be used because the label is missing or\n\tinvalid. "
	"Sufficient replicas exist for the pool to continue\n\t"
	"functioning in a degraded state.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Replace the device using "
	"'zpool replace'.\n"));
	break;

	case ZPOOL_STATUS_CORRUPT_LABEL_NR:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices could "
	"not be used because the label is missing \n\tor invalid. "
	"There are insufficient replicas for the pool to "
	"continue\n\tfunctioning.\n"));
	zpool_explain_recover(zpool_get_handle(zhp),
	zpool_get_name(zhp), reason, config);
	break;

	case ZPOOL_STATUS_FAILING_DEV:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices has "
	"experienced an unrecoverable error. An\n\tattempt was "
	"made to correct the error. Applications are "
	"unaffected.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Determine if the "
	"device needs to be replaced, and clear the errors\n\tusing"
	" 'zpool clear' or replace the device with 'zpool "
	"replace'.\n"));
	break;

	case ZPOOL_STATUS_OFFLINE_DEV:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices has "
	"been taken offline by the administrator.\n\tSufficient "
	"replicas exist for the pool to continue functioning in "
	"a\n\tdegraded state.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Online the device "
	"using 'zpool online' or replace the device with\n\t'zpool "
	"replace'.\n"));
	break;

	case ZPOOL_STATUS_REMOVED_DEV:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices has "
	"been removed by the administrator.\n\tSufficient "
	"replicas exist for the pool to continue functioning in "
	"a\n\tdegraded state.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Online the device "
	"using zpool online' or replace the device with\n\t'zpool "
	"replace'.\n"));
	break;

	case ZPOOL_STATUS_RESILVERING:
	case ZPOOL_STATUS_REBUILDING:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices is "
	"currently being resilvered. The pool will\n\tcontinue "
	"to function, possibly in a degraded state.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Wait for the resilver to "
	"complete.\n"));
	break;

	case ZPOOL_STATUS_REBUILD_SCRUB:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices have "
	"been sequentially resilvered, scrubbing\n\tthe pool "
	"is recommended.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Use 'zpool scrub' to "
	"verify all data checksums.\n"));
	break;

	case ZPOOL_STATUS_CORRUPT_DATA:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices has "
	"experienced an error resulting in data\n\tcorruption. "
	"Applications may be affected.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Restore the file in question"
	" if possible. Otherwise restore the\n\tentire pool from "
	"backup.\n"));
	break;

	case ZPOOL_STATUS_CORRUPT_POOL:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool metadata is "
	"corrupted and the pool cannot be opened.\n"));
	zpool_explain_recover(zpool_get_handle(zhp),
	zpool_get_name(zhp), reason, config);
	break;

	case ZPOOL_STATUS_VERSION_OLDER:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool is formatted using "
	"a legacy on-disk format. The pool can\n\tstill be used, "
	"but some features are unavailable.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Upgrade the pool using "
	"'zpool upgrade'. Once this is done, the\n\tpool will no "
	"longer be accessible on software that does not support\n\t"
	"feature flags.\n"));
	break;

	case ZPOOL_STATUS_VERSION_NEWER:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool has been upgraded "
	"to a newer, incompatible on-disk version.\n\tThe pool "
	"cannot be accessed on this system.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Access the pool from a "
	"system running more recent software, or\n\trestore the "
	"pool from backup.\n"));
	break;

	case ZPOOL_STATUS_FEAT_DISABLED:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("Some supported and "
	"requested features are not enabled on the pool.\n\t"
	"The pool can still be used, but some features are "
	"unavailable.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Enable all features using "
	"'zpool upgrade'. Once this is done,\n\tthe pool may no "
	"longer be accessible by software that does not support\n\t"
	"the features. See zpool-features(7) for details.\n"));
	break;

	case ZPOOL_STATUS_COMPATIBILITY_ERR:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("This pool has a "
	"compatibility list specified, but it could not be\n\t"
	"read/parsed at this time. The pool can still be used, "
	"but this\n\tshould be investigated.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Check the value of the "
	"'compatibility' property against the\n\t"
	"appropriate file in " ZPOOL_SYSCONF_COMPAT_D " or "
	ZPOOL_DATA_COMPAT_D ".\n"));
	break;

	case ZPOOL_STATUS_INCOMPATIBLE_FEAT:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more features "
	"are enabled on the pool despite not being\n\t"
	"requested by the 'compatibility' property.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Consider setting "
	"'compatibility' to an appropriate value, or\n\t"
	"adding needed features to the relevant file in\n\t"
	ZPOOL_SYSCONF_COMPAT_D " or " ZPOOL_DATA_COMPAT_D ".\n"));
	break;

	case ZPOOL_STATUS_UNSUP_FEAT_READ:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool cannot be accessed "
	"on this system because it uses the\n\tfollowing feature(s)"
	" not supported on this system:\n"));
	zpool_print_unsup_feat(config);
	(void) printf("\n");
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Access the pool from a "
	"system that supports the required feature(s),\n\tor "
	"restore the pool from backup.\n"));
	break;

	case ZPOOL_STATUS_UNSUP_FEAT_WRITE:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool can only be "
	"accessed in read-only mode on this system. It\n\tcannot be"
	" accessed in read-write mode because it uses the "
	"following\n\tfeature(s) not supported on this system:\n"));
	zpool_print_unsup_feat(config);
	(void) printf("\n");
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("The pool cannot be accessed "
	"in read-write mode. Import the pool with\n"
	"\t\"-o readonly=on\", access the pool from a system that "
	"supports the\n\trequired feature(s), or restore the "
	"pool from backup.\n"));
	break;

	case ZPOOL_STATUS_FAULTED_DEV_R:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices are "
	"faulted in response to persistent errors.\n\tSufficient "
	"replicas exist for the pool to continue functioning "
	"in a\n\tdegraded state.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Replace the faulted device, "
	"or use 'zpool clear' to mark the device\n\trepaired.\n"));
	break;

	case ZPOOL_STATUS_FAULTED_DEV_NR:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices are "
	"faulted in response to persistent errors. There are "
	"insufficient replicas for the pool to\n\tcontinue "
	"functioning.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Destroy and re-create the "
	"pool from a backup source. Manually marking the device\n"
	"\trepaired using 'zpool clear' may allow some data "
	"to be recovered.\n"));
	break;

	case ZPOOL_STATUS_IO_FAILURE_MMP:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("The pool is suspended "
	"because multihost writes failed or were delayed;\n\t"
	"another system could import the pool undetected.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Make sure the pool's devices"
	" are connected, then reboot your system and\n\timport the "
	"pool.\n"));
	break;

	case ZPOOL_STATUS_IO_FAILURE_WAIT:
	case ZPOOL_STATUS_IO_FAILURE_CONTINUE:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("One or more devices are "
	"faulted in response to IO failures.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Make sure the affected "
	"devices are connected, then run 'zpool clear'.\n"));
	break;

	case ZPOOL_STATUS_BAD_LOG:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("An intent log record "
	"could not be read.\n"
	"\tWaiting for administrator intervention to fix the "
	"faulted pool.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Either restore the affected "
	"device(s) and run 'zpool online',\n"
	"\tor ignore the intent log records by running "
	"'zpool clear'.\n"));
	break;

	case ZPOOL_STATUS_NON_NATIVE_ASHIFT:
	(void) printf(gettext("status: One or more devices are "
	"configured to use a non-native block size.\n"
	"\tExpect reduced performance.\n"));
	(void) printf(gettext("action: Replace affected devices with "
	"devices that support the\n\tconfigured block size, or "
	"migrate data to a properly configured\n\tpool.\n"));
	break;

	case ZPOOL_STATUS_HOSTID_MISMATCH:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("Mismatch between pool hostid"
	" and system hostid on imported pool.\n\tThis pool was "
	"previously imported into a system with a different "
	"hostid,\n\tand then was verbatim imported into this "
	"system.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("Export this pool on all "
	"systems on which it is imported.\n"
	"\tThen import it to correct the mismatch.\n"));
	break;

	case ZPOOL_STATUS_ERRATA:
	printf_color(ANSI_BOLD, gettext("status: "));
	printf_color(ANSI_YELLOW, gettext("Errata #%d detected.\n"),
	errata);

	switch (errata) {
	case ZPOOL_ERRATA_NONE:
	break;

	case ZPOOL_ERRATA_ZOL_2094_SCRUB:
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("To correct the issue"
	" run 'zpool scrub'.\n"));
	break;

	case ZPOOL_ERRATA_ZOL_6845_ENCRYPTION:
	(void) printf(gettext("\tExisting encrypted datasets "
	"contain an on-disk incompatibility\n\twhich "
	"needs to be corrected.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("To correct the issue"
	" backup existing encrypted datasets to new\n\t"
	"encrypted datasets and destroy the old ones. "
	"'zfs mount -o ro' can\n\tbe used to temporarily "
	"mount existing encrypted datasets readonly.\n"));
	break;

	case ZPOOL_ERRATA_ZOL_8308_ENCRYPTION:
	(void) printf(gettext("\tExisting encrypted snapshots "
	"and bookmarks contain an on-disk\n\tincompat"
	"ibility. This may cause on-disk corruption if "
	"they are used\n\twith 'zfs recv'.\n"));
	printf_color(ANSI_BOLD, gettext("action: "));
	printf_color(ANSI_YELLOW, gettext("To correct the"
	"issue, enable the bookmark_v2 feature. No "
	"additional\n\taction is needed if there are no "
	"encrypted snapshots or bookmarks.\n\tIf preserving"
	"the encrypted snapshots and bookmarks is required,"
	" use\n\ta non-raw send to backup and restore them."
	" Alternately, they may be\n\tremoved to resolve "
	"the incompatibility.\n"));
	break;

	default:
	/*
	* All errata which allow the pool to be imported
	* must contain an action message.
	*/
	assert(0);
	}
	break;

	default:
	/*
	* The remaining errors can't actually be generated, yet.
	*/
	assert(reason == ZPOOL_STATUS_OK);
	}

	if (msgid != NULL) {
	printf(" ");
	printf_color(ANSI_BOLD, gettext("see:"));
	printf(gettext(
	" https://openzfs.github.io/openzfs-docs/msg/%s\n"),
	msgid);
	}

	if (config != NULL) {
	uint64_t nerr;
	nvlist_t spares, l2cache;
	uint_t nspares, nl2cache;
	pool_checkpoint_stat_t *pcs = NULL;
	pool_removal_stat_t *prs = NULL;

	print_scan_status(zhp, nvroot);

	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_REMOVAL_STATS, (uint64_t **)&prs, &c);
	print_removal_status(zhp, prs);

	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_CHECKPOINT_STATS, (uint64_t **)&pcs, &c);
	print_checkpoint_status(pcs);

	cbp->cb_namewidth = max_width(zhp, nvroot, 0, 0,
	cbp->cb_name_flags \| VDEV_NAME_TYPE_ID);
	if (cbp->cb_namewidth < 10)
	cbp->cb_namewidth = 10;

	color_start(ANSI_BOLD);
	(void) printf(gettext("config:\n\n"));
	(void) printf(gettext("\t%-*s %-8s %5s %5s %5s"),
	cbp->cb_namewidth, "NAME", "STATE", "READ", "WRITE",
	"CKSUM");
	color_end();

	if (cbp->cb_print_slow_ios) {
	printf_color(ANSI_BOLD, " %5s", gettext("SLOW"));
	}

	if (cbp->vcdl != NULL)
	print_cmd_columns(cbp->vcdl, 0);

	printf("\n");

	print_status_config(zhp, cbp, zpool_get_name(zhp), nvroot, 0,
	B_FALSE, NULL);

	print_class_vdevs(zhp, cbp, nvroot, VDEV_ALLOC_BIAS_DEDUP);
	print_class_vdevs(zhp, cbp, nvroot, VDEV_ALLOC_BIAS_SPECIAL);
	print_class_vdevs(zhp, cbp, nvroot, VDEV_ALLOC_CLASS_LOGS);

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
	&l2cache, &nl2cache) == 0)
	print_l2cache(zhp, cbp, l2cache, nl2cache);

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
	&spares, &nspares) == 0)
	print_spares(zhp, cbp, spares, nspares);

	if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_ERRCOUNT,
	&nerr) == 0) {
	nvlist_t *nverrlist = NULL;

	/*
	* If the approximate error count is small, get a
	* precise count by fetching the entire log and
	* uniquifying the results.
	*/
	if (nerr > 0 && nerr < 100 && !cbp->cb_verbose &&
	zpool_get_errlog(zhp, &nverrlist) == 0) {
	nvpair_t *elem;

	elem = NULL;
	nerr = 0;
	while ((elem = nvlist_next_nvpair(nverrlist,
	elem)) != NULL) {
	nerr++;
	}
	}
	nvlist_free(nverrlist);

	(void) printf("\n");

	if (nerr == 0)
	(void) printf(gettext("errors: No known data "
	"errors\n"));
	else if (!cbp->cb_verbose)
	(void) printf(gettext("errors: %llu data "
	"errors, use '-v' for a list\n"),
	(u_longlong_t)nerr);
	else
	print_error_log(zhp);
	}

	if (cbp->cb_dedup_stats)
	print_dedup_stats(config);
	} else {
	(void) printf(gettext("config: The configuration cannot be "
	"determined.\n"));
	}

	return (0);
	}

	/*
	* zpool status [-c [script1,script2,...]] [-igLpPstvx] [-T d\|u] [pool] ...
	* [interval [count]]
	*
	* -c CMD For each vdev, run command CMD
	* -i Display vdev initialization status.
	* -g Display guid for individual vdev name.
	* -L Follow links when resolving vdev path name.
	* -p Display values in parsable (exact) format.
	* -P Display full path for vdev name.
	* -s Display slow IOs column.
	* -v Display complete error logs
	* -x Display only pools with potential problems
	* -D Display dedup status (undocumented)
	* -t Display vdev TRIM status.
	* -T Display a timestamp in date(1) or Unix format
	*
	* Describes the health status of all pools or some subset.
	*/
	int
	zpool_do_status(int argc, char **argv)
	{
	int c;
	int ret;
	float interval = 0;
	unsigned long count = 0;
	status_cbdata_t cb = { 0 };
	char *cmd = NULL;

	/* check options */
	while ((c = getopt(argc, argv, "c:igLpPsvxDtT:")) != -1) {
	switch (c) {
	case 'c':
	if (cmd != NULL) {
	fprintf(stderr,
	gettext("Can't set -c flag twice\n"));
	exit(1);
	}

	if (getenv("ZPOOL_SCRIPTS_ENABLED") != NULL &&
	!libzfs_envvar_is_set("ZPOOL_SCRIPTS_ENABLED")) {
	fprintf(stderr, gettext(
	"Can't run -c, disabled by "
	"ZPOOL_SCRIPTS_ENABLED.\n"));
	exit(1);
	}

	if ((getuid() <= 0 \|\| geteuid() <= 0) &&
	!libzfs_envvar_is_set("ZPOOL_SCRIPTS_AS_ROOT")) {
	fprintf(stderr, gettext(
	"Can't run -c with root privileges "
	"unless ZPOOL_SCRIPTS_AS_ROOT is set.\n"));
	exit(1);
	}
	cmd = optarg;
	break;
	case 'i':
	cb.cb_print_vdev_init = B_TRUE;
	break;
	case 'g':
	cb.cb_name_flags \|= VDEV_NAME_GUID;
	break;
	case 'L':
	cb.cb_name_flags \|= VDEV_NAME_FOLLOW_LINKS;
	break;
	case 'p':
	cb.cb_literal = B_TRUE;
	break;
	case 'P':
	cb.cb_name_flags \|= VDEV_NAME_PATH;
	break;
	case 's':
	cb.cb_print_slow_ios = B_TRUE;
	break;
	case 'v':
	cb.cb_verbose = B_TRUE;
	break;
	case 'x':
	cb.cb_explain = B_TRUE;
	break;
	case 'D':
	cb.cb_dedup_stats = B_TRUE;
	break;
	case 't':
	cb.cb_print_vdev_trim = B_TRUE;
	break;
	case 'T':
	get_timestamp_arg(*optarg);
	break;
	case '?':
	if (optopt == 'c') {
	print_zpool_script_list("status");
	exit(0);
	} else {
	fprintf(stderr,
	gettext("invalid option '%c'\n"), optopt);
	}
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	get_interval_count(&argc, argv, &interval, &count);

	if (argc == 0)
	cb.cb_allpools = B_TRUE;

	cb.cb_first = B_TRUE;
	cb.cb_print_status = B_TRUE;

	for (;;) {
	if (timestamp_fmt != NODATE)
	print_timestamp(timestamp_fmt);

	if (cmd != NULL)
	cb.vcdl = all_pools_for_each_vdev_run(argc, argv, cmd,
	NULL, NULL, 0, 0);

	ret = for_each_pool(argc, argv, B_TRUE, NULL, cb.cb_literal,
	status_callback, &cb);

	if (cb.vcdl != NULL)
	free_vdev_cmd_data_list(cb.vcdl);

	if (argc == 0 && cb.cb_count == 0)
	(void) fprintf(stderr, gettext("no pools available\n"));
	else if (cb.cb_explain && cb.cb_first && cb.cb_allpools)
	(void) printf(gettext("all pools are healthy\n"));

	if (ret != 0)
	return (ret);

	if (interval == 0)
	break;

	if (count != 0 && --count == 0)
	break;

	(void) fsleep(interval);
	}

	return (0);
	}

	typedef struct upgrade_cbdata {
	int cb_first;
	int cb_argc;
	uint64_t cb_version;
	char **cb_argv;
	} upgrade_cbdata_t;

	static int
	check_unsupp_fs(zfs_handle_t zhp, void unsupp_fs)
	{
	int zfs_version = (int)zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
	int count = (int )unsupp_fs;

	if (zfs_version > ZPL_VERSION) {
	(void) printf(gettext("%s (v%d) is not supported by this "
	"implementation of ZFS.\n"),
	zfs_get_name(zhp), zfs_version);
	(*count)++;
	}

	zfs_iter_filesystems(zhp, check_unsupp_fs, unsupp_fs);

	zfs_close(zhp);

	return (0);
	}

	static int
	upgrade_version(zpool_handle_t *zhp, uint64_t version)
	{
	int ret;
	nvlist_t *config;
	uint64_t oldversion;
	int unsupp_fs = 0;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
	&oldversion) == 0);

	char compat[ZFS_MAXPROPLEN];
	if (zpool_get_prop(zhp, ZPOOL_PROP_COMPATIBILITY, compat,
	ZFS_MAXPROPLEN, NULL, B_FALSE) != 0)
	compat[0] = '\0';

	assert(SPA_VERSION_IS_SUPPORTED(oldversion));
	assert(oldversion < version);

	ret = zfs_iter_root(zpool_get_handle(zhp), check_unsupp_fs, &unsupp_fs);
	if (ret != 0)
	return (ret);

	if (unsupp_fs) {
	(void) fprintf(stderr, gettext("Upgrade not performed due "
	"to %d unsupported filesystems (max v%d).\n"),
	unsupp_fs, (int)ZPL_VERSION);
	return (1);
	}

	if (strcmp(compat, ZPOOL_COMPAT_LEGACY) == 0) {
	(void) fprintf(stderr, gettext("Upgrade not performed because "
	"'compatibility' property set to '"
	ZPOOL_COMPAT_LEGACY "'.\n"));
	return (1);
	}

	ret = zpool_upgrade(zhp, version);
	if (ret != 0)
	return (ret);

	if (version >= SPA_VERSION_FEATURES) {
	(void) printf(gettext("Successfully upgraded "
	"'%s' from version %llu to feature flags.\n"),
	zpool_get_name(zhp), (u_longlong_t)oldversion);
	} else {
	(void) printf(gettext("Successfully upgraded "
	"'%s' from version %llu to version %llu.\n"),
	zpool_get_name(zhp), (u_longlong_t)oldversion,
	(u_longlong_t)version);
	}

	return (0);
	}

	static int
	upgrade_enable_all(zpool_handle_t zhp, int countp)
	{
	int i, ret, count;
	boolean_t firstff = B_TRUE;
	nvlist_t *enabled = zpool_get_features(zhp);

	char compat[ZFS_MAXPROPLEN];
	if (zpool_get_prop(zhp, ZPOOL_PROP_COMPATIBILITY, compat,
	ZFS_MAXPROPLEN, NULL, B_FALSE) != 0)
	compat[0] = '\0';

	boolean_t requested_features[SPA_FEATURES];
	if (zpool_do_load_compat(compat, requested_features) !=
	ZPOOL_COMPATIBILITY_OK)
	return (-1);

	count = 0;
	for (i = 0; i < SPA_FEATURES; i++) {
	const char *fname = spa_feature_table[i].fi_uname;
	const char *fguid = spa_feature_table[i].fi_guid;

	if (!spa_feature_table[i].fi_zfs_mod_supported)
	continue;

	if (!nvlist_exists(enabled, fguid) && requested_features[i]) {
	char *propname;
	verify(-1 != asprintf(&propname, "feature@%s", fname));
	ret = zpool_set_prop(zhp, propname,
	ZFS_FEATURE_ENABLED);
	if (ret != 0) {
	free(propname);
	return (ret);
	}
	count++;

	if (firstff) {
	(void) printf(gettext("Enabled the "
	"following features on '%s':\n"),
	zpool_get_name(zhp));
	firstff = B_FALSE;
	}
	(void) printf(gettext(" %s\n"), fname);
	free(propname);
	}
	}

	if (countp != NULL)
	*countp = count;
	return (0);
	}

	static int
	upgrade_cb(zpool_handle_t zhp, void arg)
	{
	upgrade_cbdata_t *cbp = arg;
	nvlist_t *config;
	uint64_t version;
	boolean_t modified_pool = B_FALSE;
	int ret;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
	&version) == 0);

	assert(SPA_VERSION_IS_SUPPORTED(version));

	if (version < cbp->cb_version) {
	cbp->cb_first = B_FALSE;
	ret = upgrade_version(zhp, cbp->cb_version);
	if (ret != 0)
	return (ret);
	modified_pool = B_TRUE;

	/*
	* If they did "zpool upgrade -a", then we could
	* be doing ioctls to different pools. We need
	* to log this history once to each pool, and bypass
	* the normal history logging that happens in main().
	*/
	(void) zpool_log_history(g_zfs, history_str);
	log_history = B_FALSE;
	}

	if (cbp->cb_version >= SPA_VERSION_FEATURES) {
	int count;
	ret = upgrade_enable_all(zhp, &count);
	if (ret != 0)
	return (ret);

	if (count > 0) {
	cbp->cb_first = B_FALSE;
	modified_pool = B_TRUE;
	}
	}

	if (modified_pool) {
	(void) printf("\n");
	(void) after_zpool_upgrade(zhp);
	}

	return (0);
	}

	static int
	upgrade_list_older_cb(zpool_handle_t zhp, void arg)
	{
	upgrade_cbdata_t *cbp = arg;
	nvlist_t *config;
	uint64_t version;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
	&version) == 0);

	assert(SPA_VERSION_IS_SUPPORTED(version));

	if (version < SPA_VERSION_FEATURES) {
	if (cbp->cb_first) {
	(void) printf(gettext("The following pools are "
	"formatted with legacy version numbers and can\n"
	"be upgraded to use feature flags. After "
	"being upgraded, these pools\nwill no "
	"longer be accessible by software that does not "
	"support feature\nflags.\n\n"
	"Note that setting a pool's 'compatibility' "
	"feature to '" ZPOOL_COMPAT_LEGACY "' will\n"
	"inhibit upgrades.\n\n"));
	(void) printf(gettext("VER POOL\n"));
	(void) printf(gettext("--- ------------\n"));
	cbp->cb_first = B_FALSE;
	}

	(void) printf("%2llu %s\n", (u_longlong_t)version,
	zpool_get_name(zhp));
	}

	return (0);
	}

	static int
	upgrade_list_disabled_cb(zpool_handle_t zhp, void arg)
	{
	upgrade_cbdata_t *cbp = arg;
	nvlist_t *config;
	uint64_t version;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
	&version) == 0);

	if (version >= SPA_VERSION_FEATURES) {
	int i;
	boolean_t poolfirst = B_TRUE;
	nvlist_t *enabled = zpool_get_features(zhp);

	for (i = 0; i < SPA_FEATURES; i++) {
	const char *fguid = spa_feature_table[i].fi_guid;
	const char *fname = spa_feature_table[i].fi_uname;

	if (!spa_feature_table[i].fi_zfs_mod_supported)
	continue;

	if (!nvlist_exists(enabled, fguid)) {
	if (cbp->cb_first) {
	(void) printf(gettext("\nSome "
	"supported features are not "
	"enabled on the following pools. "
	"Once a\nfeature is enabled the "
	"pool may become incompatible with "
	"software\nthat does not support "
	"the feature. See "
	"zpool-features(7) for "
	"details.\n\n"
	"Note that the pool "
	"'compatibility' feature can be "
	"used to inhibit\nfeature "
	"upgrades.\n\n"));
	(void) printf(gettext("POOL "
	"FEATURE\n"));
	(void) printf(gettext("------"
	"---------\n"));
	cbp->cb_first = B_FALSE;
	}

	if (poolfirst) {
	(void) printf(gettext("%s\n"),
	zpool_get_name(zhp));
	poolfirst = B_FALSE;
	}

	(void) printf(gettext(" %s\n"), fname);
	}
	/*
	* If they did "zpool upgrade -a", then we could
	* be doing ioctls to different pools. We need
	* to log this history once to each pool, and bypass
	* the normal history logging that happens in main().
	*/
	(void) zpool_log_history(g_zfs, history_str);
	log_history = B_FALSE;
	}
	}

	return (0);
	}

	/* ARGSUSED */
	static int
	upgrade_one(zpool_handle_t zhp, void data)
	{
	boolean_t modified_pool = B_FALSE;
	upgrade_cbdata_t *cbp = data;
	uint64_t cur_version;
	int ret;

	if (strcmp("log", zpool_get_name(zhp)) == 0) {
	(void) fprintf(stderr, gettext("'log' is now a reserved word\n"
	"Pool 'log' must be renamed using export and import"
	" to upgrade.\n"));
	return (1);
	}

	cur_version = zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL);
	if (cur_version > cbp->cb_version) {
	(void) printf(gettext("Pool '%s' is already formatted "
	"using more current version '%llu'.\n\n"),
	zpool_get_name(zhp), (u_longlong_t)cur_version);
	return (0);
	}

	if (cbp->cb_version != SPA_VERSION && cur_version == cbp->cb_version) {
	(void) printf(gettext("Pool '%s' is already formatted "
	"using version %llu.\n\n"), zpool_get_name(zhp),
	(u_longlong_t)cbp->cb_version);
	return (0);
	}

	if (cur_version != cbp->cb_version) {
	modified_pool = B_TRUE;
	ret = upgrade_version(zhp, cbp->cb_version);
	if (ret != 0)
	return (ret);
	}

	if (cbp->cb_version >= SPA_VERSION_FEATURES) {
	int count = 0;
	ret = upgrade_enable_all(zhp, &count);
	if (ret != 0)
	return (ret);

	if (count != 0) {
	modified_pool = B_TRUE;
	} else if (cur_version == SPA_VERSION) {
	(void) printf(gettext("Pool '%s' already has all "
	"supported and requested features enabled.\n"),
	zpool_get_name(zhp));
	}
	}

	if (modified_pool) {
	(void) printf("\n");
	(void) after_zpool_upgrade(zhp);
	}

	return (0);
	}

	/*
	* zpool upgrade
	* zpool upgrade -v
	* zpool upgrade [-V version] <-a \| pool ...>
	*
	* With no arguments, display downrev'd ZFS pool available for upgrade.
	* Individual pools can be upgraded by specifying the pool, and '-a' will
	* upgrade all pools.
	*/
	int
	zpool_do_upgrade(int argc, char **argv)
	{
	int c;
	upgrade_cbdata_t cb = { 0 };
	int ret = 0;
	boolean_t showversions = B_FALSE;
	boolean_t upgradeall = B_FALSE;
	char *end;


	/* check options */
	while ((c = getopt(argc, argv, ":avV:")) != -1) {
	switch (c) {
	case 'a':
	upgradeall = B_TRUE;
	break;
	case 'v':
	showversions = B_TRUE;
	break;
	case 'V':
	cb.cb_version = strtoll(optarg, &end, 10);
	if (*end != '\0' \|\|
	!SPA_VERSION_IS_SUPPORTED(cb.cb_version)) {
	(void) fprintf(stderr,
	gettext("invalid version '%s'\n"), optarg);
	usage(B_FALSE);
	}
	break;
	case ':':
	(void) fprintf(stderr, gettext("missing argument for "
	"'%c' option\n"), optopt);
	usage(B_FALSE);
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	cb.cb_argc = argc;
	cb.cb_argv = argv;
	argc -= optind;
	argv += optind;

	if (cb.cb_version == 0) {
	cb.cb_version = SPA_VERSION;
	} else if (!upgradeall && argc == 0) {
	(void) fprintf(stderr, gettext("-V option is "
	"incompatible with other arguments\n"));
	usage(B_FALSE);
	}

	if (showversions) {
	if (upgradeall \|\| argc != 0) {
	(void) fprintf(stderr, gettext("-v option is "
	"incompatible with other arguments\n"));
	usage(B_FALSE);
	}
	} else if (upgradeall) {
	if (argc != 0) {
	(void) fprintf(stderr, gettext("-a option should not "
	"be used along with a pool name\n"));
	usage(B_FALSE);
	}
	}

	(void) printf(gettext("This system supports ZFS pool feature "
	"flags.\n\n"));
	if (showversions) {
	int i;

	(void) printf(gettext("The following features are "
	"supported:\n\n"));
	(void) printf(gettext("FEAT DESCRIPTION\n"));
	(void) printf("----------------------------------------------"
	"---------------\n");
	for (i = 0; i < SPA_FEATURES; i++) {
	zfeature_info_t *fi = &spa_feature_table[i];
	if (!fi->fi_zfs_mod_supported)
	continue;
	const char *ro =
	(fi->fi_flags & ZFEATURE_FLAG_READONLY_COMPAT) ?
	" (read-only compatible)" : "";

	(void) printf("%-37s%s\n", fi->fi_uname, ro);
	(void) printf(" %s\n", fi->fi_desc);
	}
	(void) printf("\n");

	(void) printf(gettext("The following legacy versions are also "
	"supported:\n\n"));
	(void) printf(gettext("VER DESCRIPTION\n"));
	(void) printf("--- -----------------------------------------"
	"---------------\n");
	(void) printf(gettext(" 1 Initial ZFS version\n"));
	(void) printf(gettext(" 2 Ditto blocks "
	"(replicated metadata)\n"));
	(void) printf(gettext(" 3 Hot spares and double parity "
	"RAID-Z\n"));
	(void) printf(gettext(" 4 zpool history\n"));
	(void) printf(gettext(" 5 Compression using the gzip "
	"algorithm\n"));
	(void) printf(gettext(" 6 bootfs pool property\n"));
	(void) printf(gettext(" 7 Separate intent log devices\n"));
	(void) printf(gettext(" 8 Delegated administration\n"));
	(void) printf(gettext(" 9 refquota and refreservation "
	"properties\n"));
	(void) printf(gettext(" 10 Cache devices\n"));
	(void) printf(gettext(" 11 Improved scrub performance\n"));
	(void) printf(gettext(" 12 Snapshot properties\n"));
	(void) printf(gettext(" 13 snapused property\n"));
	(void) printf(gettext(" 14 passthrough-x aclinherit\n"));
	(void) printf(gettext(" 15 user/group space accounting\n"));
	(void) printf(gettext(" 16 stmf property support\n"));
	(void) printf(gettext(" 17 Triple-parity RAID-Z\n"));
	(void) printf(gettext(" 18 Snapshot user holds\n"));
	(void) printf(gettext(" 19 Log device removal\n"));
	(void) printf(gettext(" 20 Compression using zle "
	"(zero-length encoding)\n"));
	(void) printf(gettext(" 21 Deduplication\n"));
	(void) printf(gettext(" 22 Received properties\n"));
	(void) printf(gettext(" 23 Slim ZIL\n"));
	(void) printf(gettext(" 24 System attributes\n"));
	(void) printf(gettext(" 25 Improved scrub stats\n"));
	(void) printf(gettext(" 26 Improved snapshot deletion "
	"performance\n"));
	(void) printf(gettext(" 27 Improved snapshot creation "
	"performance\n"));
	(void) printf(gettext(" 28 Multiple vdev replacements\n"));
	(void) printf(gettext("\nFor more information on a particular "
	"version, including supported releases,\n"));
	(void) printf(gettext("see the ZFS Administration Guide.\n\n"));
	} else if (argc == 0 && upgradeall) {
	cb.cb_first = B_TRUE;
	ret = zpool_iter(g_zfs, upgrade_cb, &cb);
	if (ret == 0 && cb.cb_first) {
	if (cb.cb_version == SPA_VERSION) {
	(void) printf(gettext("All pools are already "
	"formatted using feature flags.\n\n"));
	(void) printf(gettext("Every feature flags "
	"pool already has all supported and "
	"requested features enabled.\n"));
	} else {
	(void) printf(gettext("All pools are already "
	"formatted with version %llu or higher.\n"),
	(u_longlong_t)cb.cb_version);
	}
	}
	} else if (argc == 0) {
	cb.cb_first = B_TRUE;
	ret = zpool_iter(g_zfs, upgrade_list_older_cb, &cb);
	assert(ret == 0);

	if (cb.cb_first) {
	(void) printf(gettext("All pools are formatted "
	"using feature flags.\n\n"));
	} else {
	(void) printf(gettext("\nUse 'zpool upgrade -v' "
	"for a list of available legacy versions.\n"));
	}

	cb.cb_first = B_TRUE;
	ret = zpool_iter(g_zfs, upgrade_list_disabled_cb, &cb);
	assert(ret == 0);

	if (cb.cb_first) {
	(void) printf(gettext("Every feature flags pool has "
	"all supported and requested features enabled.\n"));
	} else {
	(void) printf(gettext("\n"));
	}
	} else {
	ret = for_each_pool(argc, argv, B_FALSE, NULL, B_FALSE,
	upgrade_one, &cb);
	}

	return (ret);
	}

	typedef struct hist_cbdata {
	boolean_t first;
	boolean_t longfmt;
	boolean_t internal;
	} hist_cbdata_t;

	static void
	print_history_records(nvlist_t nvhis, hist_cbdata_t cb)
	{
	nvlist_t **records;
	uint_t numrecords;
	int i;

	verify(nvlist_lookup_nvlist_array(nvhis, ZPOOL_HIST_RECORD,
	&records, &numrecords) == 0);
	for (i = 0; i < numrecords; i++) {
	nvlist_t *rec = records[i];
	char tbuf[64] = "";

	if (nvlist_exists(rec, ZPOOL_HIST_TIME)) {
	time_t tsec;
	struct tm t;

	tsec = fnvlist_lookup_uint64(records[i],
	ZPOOL_HIST_TIME);
	(void) localtime_r(&tsec, &t);
	(void) strftime(tbuf, sizeof (tbuf), "%F.%T", &t);
	}

	if (nvlist_exists(rec, ZPOOL_HIST_ELAPSED_NS)) {
	uint64_t elapsed_ns = fnvlist_lookup_int64(records[i],
	ZPOOL_HIST_ELAPSED_NS);
	(void) snprintf(tbuf + strlen(tbuf),
	sizeof (tbuf) - strlen(tbuf),
	" (%lldms)", (long long)elapsed_ns / 1000 / 1000);
	}

	if (nvlist_exists(rec, ZPOOL_HIST_CMD)) {
	(void) printf("%s %s", tbuf,
	fnvlist_lookup_string(rec, ZPOOL_HIST_CMD));
	} else if (nvlist_exists(rec, ZPOOL_HIST_INT_EVENT)) {
	int ievent =
	fnvlist_lookup_uint64(rec, ZPOOL_HIST_INT_EVENT);
	if (!cb->internal)
	continue;
	if (ievent >= ZFS_NUM_LEGACY_HISTORY_EVENTS) {
	(void) printf("%s unrecognized record:\n",
	tbuf);
	dump_nvlist(rec, 4);
	continue;
	}
	(void) printf("%s [internal %s txg:%lld] %s", tbuf,
	zfs_history_event_names[ievent],
	(longlong_t)fnvlist_lookup_uint64(
	rec, ZPOOL_HIST_TXG),
	fnvlist_lookup_string(rec, ZPOOL_HIST_INT_STR));
	} else if (nvlist_exists(rec, ZPOOL_HIST_INT_NAME)) {
	if (!cb->internal)
	continue;
	(void) printf("%s [txg:%lld] %s", tbuf,
	(longlong_t)fnvlist_lookup_uint64(
	rec, ZPOOL_HIST_TXG),
	fnvlist_lookup_string(rec, ZPOOL_HIST_INT_NAME));
	if (nvlist_exists(rec, ZPOOL_HIST_DSNAME)) {
	(void) printf(" %s (%llu)",
	fnvlist_lookup_string(rec,
	ZPOOL_HIST_DSNAME),
	(u_longlong_t)fnvlist_lookup_uint64(rec,
	ZPOOL_HIST_DSID));
	}
	(void) printf(" %s", fnvlist_lookup_string(rec,
	ZPOOL_HIST_INT_STR));
	} else if (nvlist_exists(rec, ZPOOL_HIST_IOCTL)) {
	if (!cb->internal)
	continue;
	(void) printf("%s ioctl %s\n", tbuf,
	fnvlist_lookup_string(rec, ZPOOL_HIST_IOCTL));
	if (nvlist_exists(rec, ZPOOL_HIST_INPUT_NVL)) {
	(void) printf(" input:\n");
	dump_nvlist(fnvlist_lookup_nvlist(rec,
	ZPOOL_HIST_INPUT_NVL), 8);
	}
	if (nvlist_exists(rec, ZPOOL_HIST_OUTPUT_NVL)) {
	(void) printf(" output:\n");
	dump_nvlist(fnvlist_lookup_nvlist(rec,
	ZPOOL_HIST_OUTPUT_NVL), 8);
	}
	if (nvlist_exists(rec, ZPOOL_HIST_OUTPUT_SIZE)) {
	(void) printf(" output nvlist omitted; "
	"original size: %lldKB\n",
	(longlong_t)fnvlist_lookup_int64(rec,
	ZPOOL_HIST_OUTPUT_SIZE) / 1024);
	}
	if (nvlist_exists(rec, ZPOOL_HIST_ERRNO)) {
	(void) printf(" errno: %lld\n",
	(longlong_t)fnvlist_lookup_int64(rec,
	ZPOOL_HIST_ERRNO));
	}
	} else {
	if (!cb->internal)
	continue;
	(void) printf("%s unrecognized record:\n", tbuf);
	dump_nvlist(rec, 4);
	}

	if (!cb->longfmt) {
	(void) printf("\n");
	continue;
	}
	(void) printf(" [");
	if (nvlist_exists(rec, ZPOOL_HIST_WHO)) {
	uid_t who = fnvlist_lookup_uint64(rec, ZPOOL_HIST_WHO);
	struct passwd *pwd = getpwuid(who);
	(void) printf("user %d ", (int)who);
	if (pwd != NULL)
	(void) printf("(%s) ", pwd->pw_name);
	}
	if (nvlist_exists(rec, ZPOOL_HIST_HOST)) {
	(void) printf("on %s",
	fnvlist_lookup_string(rec, ZPOOL_HIST_HOST));
	}
	if (nvlist_exists(rec, ZPOOL_HIST_ZONE)) {
	(void) printf(":%s",
	fnvlist_lookup_string(rec, ZPOOL_HIST_ZONE));
	}

	(void) printf("]");
	(void) printf("\n");
	}
	}

	/*
	* Print out the command history for a specific pool.
	*/
	static int
	get_history_one(zpool_handle_t zhp, void data)
	{
	nvlist_t *nvhis;
	int ret;
	hist_cbdata_t cb = (hist_cbdata_t )data;
	uint64_t off = 0;
	boolean_t eof = B_FALSE;

	cb->first = B_FALSE;

	(void) printf(gettext("History for '%s':\n"), zpool_get_name(zhp));

	while (!eof) {
	if ((ret = zpool_get_history(zhp, &nvhis, &off, &eof)) != 0)
	return (ret);

	print_history_records(nvhis, cb);
	nvlist_free(nvhis);
	}
	(void) printf("\n");

	return (ret);
	}

	/*
	* zpool history <pool>
	*
	* Displays the history of commands that modified pools.
	*/
	int
	zpool_do_history(int argc, char **argv)
	{
	hist_cbdata_t cbdata = { 0 };
	int ret;
	int c;

	cbdata.first = B_TRUE;
	/* check options */
	while ((c = getopt(argc, argv, "li")) != -1) {
	switch (c) {
	case 'l':
	cbdata.longfmt = B_TRUE;
	break;
	case 'i':
	cbdata.internal = B_TRUE;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}
	argc -= optind;
	argv += optind;

	ret = for_each_pool(argc, argv, B_FALSE, NULL, B_FALSE, get_history_one,
	&cbdata);

	if (argc == 0 && cbdata.first == B_TRUE) {
	(void) fprintf(stderr, gettext("no pools available\n"));
	return (0);
	}

	return (ret);
	}

	typedef struct ev_opts {
	int verbose;
	int scripted;
	int follow;
	int clear;
	char poolname[ZFS_MAX_DATASET_NAME_LEN];
	} ev_opts_t;

	static void
	zpool_do_events_short(nvlist_t nvl, ev_opts_t opts)
	{
	char ctime_str[26], str[32], *ptr;
	int64_t *tv;
	uint_t n;

	verify(nvlist_lookup_int64_array(nvl, FM_EREPORT_TIME, &tv, &n) == 0);
	memset(str, ' ', 32);
	(void) ctime_r((const time_t *)&tv[0], ctime_str);
	(void) memcpy(str, ctime_str+4, 6); /* 'Jun 30' */
	(void) memcpy(str+7, ctime_str+20, 4); /* '1993' */
	(void) memcpy(str+12, ctime_str+11, 8); /* '21:49:08' */
	(void) sprintf(str+20, ".%09lld", (longlong_t)tv[1]); /* '.123456789' */
	if (opts->scripted)
	(void) printf(gettext("%s\t"), str);
	else
	(void) printf(gettext("%s "), str);

	verify(nvlist_lookup_string(nvl, FM_CLASS, &ptr) == 0);
	(void) printf(gettext("%s\n"), ptr);
	}

	static void
	zpool_do_events_nvprint(nvlist_t *nvl, int depth)
	{
	nvpair_t *nvp;

	for (nvp = nvlist_next_nvpair(nvl, NULL);
	nvp != NULL; nvp = nvlist_next_nvpair(nvl, nvp)) {

	data_type_t type = nvpair_type(nvp);
	const char *name = nvpair_name(nvp);

	boolean_t b;
	uint8_t i8;
	uint16_t i16;
	uint32_t i32;
	uint64_t i64;
	char *str;
	nvlist_t *cnv;

	printf(gettext("%*s%s = "), depth, "", name);

	switch (type) {
	case DATA_TYPE_BOOLEAN:
	printf(gettext("%s"), "1");
	break;

	case DATA_TYPE_BOOLEAN_VALUE:
	(void) nvpair_value_boolean_value(nvp, &b);
	printf(gettext("%s"), b ? "1" : "0");
	break;

	case DATA_TYPE_BYTE:
	(void) nvpair_value_byte(nvp, &i8);
	printf(gettext("0x%x"), i8);
	break;

	case DATA_TYPE_INT8:
	(void) nvpair_value_int8(nvp, (void *)&i8);
	printf(gettext("0x%x"), i8);
	break;

	case DATA_TYPE_UINT8:
	(void) nvpair_value_uint8(nvp, &i8);
	printf(gettext("0x%x"), i8);
	break;

	case DATA_TYPE_INT16:
	(void) nvpair_value_int16(nvp, (void *)&i16);
	printf(gettext("0x%x"), i16);
	break;

	case DATA_TYPE_UINT16:
	(void) nvpair_value_uint16(nvp, &i16);
	printf(gettext("0x%x"), i16);
	break;

	case DATA_TYPE_INT32:
	(void) nvpair_value_int32(nvp, (void *)&i32);
	printf(gettext("0x%x"), i32);
	break;

	case DATA_TYPE_UINT32:
	(void) nvpair_value_uint32(nvp, &i32);
	printf(gettext("0x%x"), i32);
	break;

	case DATA_TYPE_INT64:
	(void) nvpair_value_int64(nvp, (void *)&i64);
	printf(gettext("0x%llx"), (u_longlong_t)i64);
	break;

	case DATA_TYPE_UINT64:
	(void) nvpair_value_uint64(nvp, &i64);
	/*
	* translate vdev state values to readable
	* strings to aide zpool events consumers
	*/
	if (strcmp(name,
	FM_EREPORT_PAYLOAD_ZFS_VDEV_STATE) == 0 \|\|
	strcmp(name,
	FM_EREPORT_PAYLOAD_ZFS_VDEV_LASTSTATE) == 0) {
	printf(gettext("\"%s\" (0x%llx)"),
	zpool_state_to_name(i64, VDEV_AUX_NONE),
	(u_longlong_t)i64);
	} else {
	printf(gettext("0x%llx"), (u_longlong_t)i64);
	}
	break;

	case DATA_TYPE_HRTIME:
	(void) nvpair_value_hrtime(nvp, (void *)&i64);
	printf(gettext("0x%llx"), (u_longlong_t)i64);
	break;

	case DATA_TYPE_STRING:
	(void) nvpair_value_string(nvp, &str);
	printf(gettext("\"%s\""), str ? str : "<NULL>");
	break;

	case DATA_TYPE_NVLIST:
	printf(gettext("(embedded nvlist)\n"));
	(void) nvpair_value_nvlist(nvp, &cnv);
	zpool_do_events_nvprint(cnv, depth + 8);
	printf(gettext("%*s(end %s)"), depth, "", name);
	break;

	case DATA_TYPE_NVLIST_ARRAY: {
	nvlist_t **val;
	uint_t i, nelem;

	(void) nvpair_value_nvlist_array(nvp, &val, &nelem);
	printf(gettext("(%d embedded nvlists)\n"), nelem);
	for (i = 0; i < nelem; i++) {
	printf(gettext("%*s%s[%d] = %s\n"),
	depth, "", name, i, "(embedded nvlist)");
	zpool_do_events_nvprint(val[i], depth + 8);
	printf(gettext("%*s(end %s[%i])\n"),
	depth, "", name, i);
	}
	printf(gettext("%*s(end %s)\n"), depth, "", name);
	}
	break;

	case DATA_TYPE_INT8_ARRAY: {
	int8_t *val;
	uint_t i, nelem;

	(void) nvpair_value_int8_array(nvp, &val, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("0x%x "), val[i]);

	break;
	}

	case DATA_TYPE_UINT8_ARRAY: {
	uint8_t *val;
	uint_t i, nelem;

	(void) nvpair_value_uint8_array(nvp, &val, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("0x%x "), val[i]);

	break;
	}

	case DATA_TYPE_INT16_ARRAY: {
	int16_t *val;
	uint_t i, nelem;

	(void) nvpair_value_int16_array(nvp, &val, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("0x%x "), val[i]);

	break;
	}

	case DATA_TYPE_UINT16_ARRAY: {
	uint16_t *val;
	uint_t i, nelem;

	(void) nvpair_value_uint16_array(nvp, &val, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("0x%x "), val[i]);

	break;
	}

	case DATA_TYPE_INT32_ARRAY: {
	int32_t *val;
	uint_t i, nelem;

	(void) nvpair_value_int32_array(nvp, &val, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("0x%x "), val[i]);

	break;
	}

	case DATA_TYPE_UINT32_ARRAY: {
	uint32_t *val;
	uint_t i, nelem;

	(void) nvpair_value_uint32_array(nvp, &val, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("0x%x "), val[i]);

	break;
	}

	case DATA_TYPE_INT64_ARRAY: {
	int64_t *val;
	uint_t i, nelem;

	(void) nvpair_value_int64_array(nvp, &val, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("0x%llx "),
	(u_longlong_t)val[i]);

	break;
	}

	case DATA_TYPE_UINT64_ARRAY: {
	uint64_t *val;
	uint_t i, nelem;

	(void) nvpair_value_uint64_array(nvp, &val, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("0x%llx "),
	(u_longlong_t)val[i]);

	break;
	}

	case DATA_TYPE_STRING_ARRAY: {
	char **str;
	uint_t i, nelem;

	(void) nvpair_value_string_array(nvp, &str, &nelem);
	for (i = 0; i < nelem; i++)
	printf(gettext("\"%s\" "),
	str[i] ? str[i] : "<NULL>");

	break;
	}

	case DATA_TYPE_BOOLEAN_ARRAY:
	case DATA_TYPE_BYTE_ARRAY:
	case DATA_TYPE_DOUBLE:
	case DATA_TYPE_DONTCARE:
	case DATA_TYPE_UNKNOWN:
	printf(gettext("<unknown>"));
	break;
	}

	printf(gettext("\n"));
	}
	}

	static int
	zpool_do_events_next(ev_opts_t *opts)
	{
	nvlist_t *nvl;
	int zevent_fd, ret, dropped;
	char *pool;

	zevent_fd = open(ZFS_DEV, O_RDWR);
	VERIFY(zevent_fd >= 0);

	if (!opts->scripted)
	(void) printf(gettext("%-30s %s\n"), "TIME", "CLASS");

	while (1) {
	ret = zpool_events_next(g_zfs, &nvl, &dropped,
	(opts->follow ? ZEVENT_NONE : ZEVENT_NONBLOCK), zevent_fd);
	if (ret \|\| nvl == NULL)
	break;

	if (dropped > 0)
	(void) printf(gettext("dropped %d events\n"), dropped);

	if (strlen(opts->poolname) > 0 &&
	nvlist_lookup_string(nvl, FM_FMRI_ZFS_POOL, &pool) == 0 &&
	strcmp(opts->poolname, pool) != 0)
	continue;

	zpool_do_events_short(nvl, opts);

	if (opts->verbose) {
	zpool_do_events_nvprint(nvl, 8);
	printf(gettext("\n"));
	}
	(void) fflush(stdout);

	nvlist_free(nvl);
	}

	VERIFY(0 == close(zevent_fd));

	return (ret);
	}

	static int
	zpool_do_events_clear(ev_opts_t *opts)
	{
	int count, ret;

	ret = zpool_events_clear(g_zfs, &count);
	if (!ret)
	(void) printf(gettext("cleared %d events\n"), count);

	return (ret);
	}

	/*
	* zpool events [-vHf [pool] \| -c]
	*
	* Displays events logs by ZFS.
	*/
	int
	zpool_do_events(int argc, char **argv)
	{
	ev_opts_t opts = { 0 };
	int ret;
	int c;

	/* check options */
	while ((c = getopt(argc, argv, "vHfc")) != -1) {
	switch (c) {
	case 'v':
	opts.verbose = 1;
	break;
	case 'H':
	opts.scripted = 1;
	break;
	case 'f':
	opts.follow = 1;
	break;
	case 'c':
	opts.clear = 1;
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}
	argc -= optind;
	argv += optind;

	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	} else if (argc == 1) {
	(void) strlcpy(opts.poolname, argv[0], sizeof (opts.poolname));
	if (!zfs_name_valid(opts.poolname, ZFS_TYPE_POOL)) {
	(void) fprintf(stderr,
	gettext("invalid pool name '%s'\n"), opts.poolname);
	usage(B_FALSE);
	}
	}

	if ((argc == 1 \|\| opts.verbose \|\| opts.scripted \|\| opts.follow) &&
	opts.clear) {
	(void) fprintf(stderr,
	gettext("invalid options combined with -c\n"));
	usage(B_FALSE);
	}

	if (opts.clear)
	ret = zpool_do_events_clear(&opts);
	else
	ret = zpool_do_events_next(&opts);

	return (ret);
	}

	static int
	get_callback(zpool_handle_t zhp, void data)
	{
	zprop_get_cbdata_t cbp = (zprop_get_cbdata_t )data;
	char value[MAXNAMELEN];
	zprop_source_t srctype;
	zprop_list_t *pl;

	for (pl = cbp->cb_proplist; pl != NULL; pl = pl->pl_next) {

	/*
	* Skip the special fake placeholder. This will also skip
	* over the name property when 'all' is specified.
	*/
	if (pl->pl_prop == ZPOOL_PROP_NAME &&
	pl == cbp->cb_proplist)
	continue;

	if (pl->pl_prop == ZPROP_INVAL &&
	(zpool_prop_feature(pl->pl_user_prop) \|\|
	zpool_prop_unsupported(pl->pl_user_prop))) {
	srctype = ZPROP_SRC_LOCAL;

	if (zpool_prop_get_feature(zhp, pl->pl_user_prop,
	value, sizeof (value)) == 0) {
	zprop_print_one_property(zpool_get_name(zhp),
	cbp, pl->pl_user_prop, value, srctype,
	NULL, NULL);
	}
	} else {
	if (zpool_get_prop(zhp, pl->pl_prop, value,
	sizeof (value), &srctype, cbp->cb_literal) != 0)
	continue;

	zprop_print_one_property(zpool_get_name(zhp), cbp,
	zpool_prop_to_name(pl->pl_prop), value, srctype,
	NULL, NULL);
	}
	}
	return (0);
	}

	/*
	* zpool get [-Hp] [-o "all" \| field[,...]] <"all" \| property[,...]> <pool> ...
	*
	* -H Scripted mode. Don't display headers, and separate properties
	* by a single tab.
	* -o List of columns to display. Defaults to
	* "name,property,value,source".
	* -p Display values in parsable (exact) format.
	*
	* Get properties of pools in the system. Output space statistics
	* for each one as well as other attributes.
	*/
	int
	zpool_do_get(int argc, char **argv)
	{
	zprop_get_cbdata_t cb = { 0 };
	zprop_list_t fake_name = { 0 };
	int ret;
	int c, i;
	char *value;

	cb.cb_first = B_TRUE;

	/*
	* Set up default columns and sources.
	*/
	cb.cb_sources = ZPROP_SRC_ALL;
	cb.cb_columns[0] = GET_COL_NAME;
	cb.cb_columns[1] = GET_COL_PROPERTY;
	cb.cb_columns[2] = GET_COL_VALUE;
	cb.cb_columns[3] = GET_COL_SOURCE;
	cb.cb_type = ZFS_TYPE_POOL;

	/* check options */
	while ((c = getopt(argc, argv, ":Hpo:")) != -1) {
	switch (c) {
	case 'p':
	cb.cb_literal = B_TRUE;
	break;
	case 'H':
	cb.cb_scripted = B_TRUE;
	break;
	case 'o':
	bzero(&cb.cb_columns, sizeof (cb.cb_columns));
	i = 0;
	while (*optarg != '\0') {
	static char *col_subopts[] =
	{ "name", "property", "value", "source",
	"all", NULL };

	if (i == ZFS_GET_NCOLS) {
	(void) fprintf(stderr, gettext("too "
	"many fields given to -o "
	"option\n"));
	usage(B_FALSE);
	}

	switch (getsubopt(&optarg, col_subopts,
	&value)) {
	case 0:
	cb.cb_columns[i++] = GET_COL_NAME;
	break;
	case 1:
	cb.cb_columns[i++] = GET_COL_PROPERTY;
	break;
	case 2:
	cb.cb_columns[i++] = GET_COL_VALUE;
	break;
	case 3:
	cb.cb_columns[i++] = GET_COL_SOURCE;
	break;
	case 4:
	if (i > 0) {
	(void) fprintf(stderr,
	gettext("\"all\" conflicts "
	"with specific fields "
	"given to -o option\n"));
	usage(B_FALSE);
	}
	cb.cb_columns[0] = GET_COL_NAME;
	cb.cb_columns[1] = GET_COL_PROPERTY;
	cb.cb_columns[2] = GET_COL_VALUE;
	cb.cb_columns[3] = GET_COL_SOURCE;
	i = ZFS_GET_NCOLS;
	break;
	default:
	(void) fprintf(stderr,
	gettext("invalid column name "
	"'%s'\n"), value);
	usage(B_FALSE);
	}
	}
	break;
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing property "
	"argument\n"));
	usage(B_FALSE);
	}

	if (zprop_get_list(g_zfs, argv[0], &cb.cb_proplist,
	ZFS_TYPE_POOL) != 0)
	usage(B_FALSE);

	argc--;
	argv++;

	if (cb.cb_proplist != NULL) {
	fake_name.pl_prop = ZPOOL_PROP_NAME;
	fake_name.pl_width = strlen(gettext("NAME"));
	fake_name.pl_next = cb.cb_proplist;
	cb.cb_proplist = &fake_name;
	}

	ret = for_each_pool(argc, argv, B_TRUE, &cb.cb_proplist, cb.cb_literal,
	get_callback, &cb);

	if (cb.cb_proplist == &fake_name)
	zprop_free_list(fake_name.pl_next);
	else
	zprop_free_list(cb.cb_proplist);

	return (ret);
	}

	typedef struct set_cbdata {
	char *cb_propname;
	char *cb_value;
	boolean_t cb_any_successful;
	} set_cbdata_t;

	static int
	set_callback(zpool_handle_t zhp, void data)
	{
	int error;
	set_cbdata_t cb = (set_cbdata_t )data;

	/* Check if we have out-of-bounds features */
	if (strcmp(cb->cb_propname, ZPOOL_CONFIG_COMPATIBILITY) == 0) {
	boolean_t features[SPA_FEATURES];
	if (zpool_do_load_compat(cb->cb_value, features) !=
	ZPOOL_COMPATIBILITY_OK)
	return (-1);

	nvlist_t *enabled = zpool_get_features(zhp);
	spa_feature_t i;
	for (i = 0; i < SPA_FEATURES; i++) {
	const char *fguid = spa_feature_table[i].fi_guid;
	if (nvlist_exists(enabled, fguid) && !features[i])
	break;
	}
	if (i < SPA_FEATURES)
	(void) fprintf(stderr, gettext("Warning: one or "
	"more features already enabled on pool '%s'\n"
	"are not present in this compatibility set.\n"),
	zpool_get_name(zhp));
	}

	/* if we're setting a feature, check it's in compatibility set */
	if (zpool_prop_feature(cb->cb_propname) &&
	strcmp(cb->cb_value, ZFS_FEATURE_ENABLED) == 0) {
	char *fname = strchr(cb->cb_propname, '@') + 1;
	spa_feature_t f;

	if (zfeature_lookup_name(fname, &f) == 0) {
	char compat[ZFS_MAXPROPLEN];
	if (zpool_get_prop(zhp, ZPOOL_PROP_COMPATIBILITY,
	compat, ZFS_MAXPROPLEN, NULL, B_FALSE) != 0)
	compat[0] = '\0';

	boolean_t features[SPA_FEATURES];
	if (zpool_do_load_compat(compat, features) !=
	ZPOOL_COMPATIBILITY_OK) {
	(void) fprintf(stderr, gettext("Error: "
	"cannot enable feature '%s' on pool '%s'\n"
	"because the pool's 'compatibility' "
	"property cannot be parsed.\n"),
	fname, zpool_get_name(zhp));
	return (-1);
	}

	if (!features[f]) {
	(void) fprintf(stderr, gettext("Error: "
	"cannot enable feature '%s' on pool '%s'\n"
	"as it is not specified in this pool's "
	"current compatibility set.\n"
	"Consider setting 'compatibility' to a "
	"less restrictive set, or to 'off'.\n"),
	fname, zpool_get_name(zhp));
	return (-1);
	}
	}
	}

	error = zpool_set_prop(zhp, cb->cb_propname, cb->cb_value);

	if (!error)
	cb->cb_any_successful = B_TRUE;

	return (error);
	}

	int
	zpool_do_set(int argc, char **argv)
	{
	set_cbdata_t cb = { 0 };
	int error;

	if (argc > 1 && argv[1][0] == '-') {
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	argv[1][1]);
	usage(B_FALSE);
	}

	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing property=value "
	"argument\n"));
	usage(B_FALSE);
	}

	if (argc < 3) {
	(void) fprintf(stderr, gettext("missing pool name\n"));
	usage(B_FALSE);
	}

	if (argc > 3) {
	(void) fprintf(stderr, gettext("too many pool names\n"));
	usage(B_FALSE);
	}

	cb.cb_propname = argv[1];
	cb.cb_value = strchr(cb.cb_propname, '=');
	if (cb.cb_value == NULL) {
	(void) fprintf(stderr, gettext("missing value in "
	"property=value argument\n"));
	usage(B_FALSE);
	}

	*(cb.cb_value) = '\0';
	cb.cb_value++;

	error = for_each_pool(argc - 2, argv + 2, B_TRUE, NULL, B_FALSE,
	set_callback, &cb);

	return (error);
	}

	/* Add up the total number of bytes left to initialize/trim across all vdevs */
	static uint64_t
	vdev_activity_remaining(nvlist_t *nv, zpool_wait_activity_t activity)
	{
	uint64_t bytes_remaining;
	nvlist_t **child;
	uint_t c, children;
	vdev_stat_t *vs;

	assert(activity == ZPOOL_WAIT_INITIALIZE \|\|
	activity == ZPOOL_WAIT_TRIM);

	verify(nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &c) == 0);

	if (activity == ZPOOL_WAIT_INITIALIZE &&
	vs->vs_initialize_state == VDEV_INITIALIZE_ACTIVE)
	bytes_remaining = vs->vs_initialize_bytes_est -
	vs->vs_initialize_bytes_done;
	else if (activity == ZPOOL_WAIT_TRIM &&
	vs->vs_trim_state == VDEV_TRIM_ACTIVE)
	bytes_remaining = vs->vs_trim_bytes_est -
	vs->vs_trim_bytes_done;
	else
	bytes_remaining = 0;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	children = 0;

	for (c = 0; c < children; c++)
	bytes_remaining += vdev_activity_remaining(child[c], activity);

	return (bytes_remaining);
	}

	/* Add up the total number of bytes left to rebuild across top-level vdevs */
	static uint64_t
	vdev_activity_top_remaining(nvlist_t *nv)
	{
	uint64_t bytes_remaining = 0;
	nvlist_t **child;
	uint_t children;
	int error;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	children = 0;

	for (uint_t c = 0; c < children; c++) {
	vdev_rebuild_stat_t *vrs;
	uint_t i;

	error = nvlist_lookup_uint64_array(child[c],
	ZPOOL_CONFIG_REBUILD_STATS, (uint64_t **)&vrs, &i);
	if (error == 0) {
	if (vrs->vrs_state == VDEV_REBUILD_ACTIVE) {
	bytes_remaining += (vrs->vrs_bytes_est -
	vrs->vrs_bytes_rebuilt);
	}
	}
	}

	return (bytes_remaining);
	}

	/* Whether any vdevs are 'spare' or 'replacing' vdevs */
	static boolean_t
	vdev_any_spare_replacing(nvlist_t *nv)
	{
	nvlist_t **child;
	uint_t c, children;
	char *vdev_type;

	(void) nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &vdev_type);

	if (strcmp(vdev_type, VDEV_TYPE_REPLACING) == 0 \|\|
	strcmp(vdev_type, VDEV_TYPE_SPARE) == 0 \|\|
	strcmp(vdev_type, VDEV_TYPE_DRAID_SPARE) == 0) {
	return (B_TRUE);
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	children = 0;

	for (c = 0; c < children; c++) {
	if (vdev_any_spare_replacing(child[c]))
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	typedef struct wait_data {
	char *wd_poolname;
	boolean_t wd_scripted;
	boolean_t wd_exact;
	boolean_t wd_headers_once;
	boolean_t wd_should_exit;
	/* Which activities to wait for */
	boolean_t wd_enabled[ZPOOL_WAIT_NUM_ACTIVITIES];
	float wd_interval;
	pthread_cond_t wd_cv;
	pthread_mutex_t wd_mutex;
	} wait_data_t;

	/*
	* Print to stdout a single line, containing one column for each activity that
	* we are waiting for specifying how many bytes of work are left for that
	* activity.
	*/
	static void
	print_wait_status_row(wait_data_t wd, zpool_handle_t zhp, int row)
	{
	nvlist_t config, nvroot;
	uint_t c;
	int i;
	pool_checkpoint_stat_t *pcs = NULL;
	pool_scan_stat_t *pss = NULL;
	pool_removal_stat_t *prs = NULL;
	char *headers[] = {"DISCARD", "FREE", "INITIALIZE", "REPLACE",
	"REMOVE", "RESILVER", "SCRUB", "TRIM"};
	int col_widths[ZPOOL_WAIT_NUM_ACTIVITIES];

	/* Calculate the width of each column */
	for (i = 0; i < ZPOOL_WAIT_NUM_ACTIVITIES; i++) {
	/*
	* Make sure we have enough space in the col for pretty-printed
	* numbers and for the column header, and then leave a couple
	* spaces between cols for readability.
	*/
	col_widths[i] = MAX(strlen(headers[i]), 6) + 2;
	}

	/* Print header if appropriate */
	int term_height = terminal_height();
	boolean_t reprint_header = (!wd->wd_headers_once && term_height > 0 &&
	row % (term_height-1) == 0);
	if (!wd->wd_scripted && (row == 0 \|\| reprint_header)) {
	for (i = 0; i < ZPOOL_WAIT_NUM_ACTIVITIES; i++) {
	if (wd->wd_enabled[i])
	(void) printf("%*s", col_widths[i], headers[i]);
	}
	(void) printf("\n");
	}

	/* Bytes of work remaining in each activity */
	int64_t bytes_rem[ZPOOL_WAIT_NUM_ACTIVITIES] = {0};

	bytes_rem[ZPOOL_WAIT_FREE] =
	zpool_get_prop_int(zhp, ZPOOL_PROP_FREEING, NULL);

	config = zpool_get_config(zhp, NULL);
	nvroot = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE);

	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_CHECKPOINT_STATS, (uint64_t **)&pcs, &c);
	if (pcs != NULL && pcs->pcs_state == CS_CHECKPOINT_DISCARDING)
	bytes_rem[ZPOOL_WAIT_CKPT_DISCARD] = pcs->pcs_space;

	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_REMOVAL_STATS, (uint64_t **)&prs, &c);
	if (prs != NULL && prs->prs_state == DSS_SCANNING)
	bytes_rem[ZPOOL_WAIT_REMOVE] = prs->prs_to_copy -
	prs->prs_copied;

	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_SCAN_STATS, (uint64_t **)&pss, &c);
	if (pss != NULL && pss->pss_state == DSS_SCANNING &&
	pss->pss_pass_scrub_pause == 0) {
	int64_t rem = pss->pss_to_examine - pss->pss_issued;
	if (pss->pss_func == POOL_SCAN_SCRUB)
	bytes_rem[ZPOOL_WAIT_SCRUB] = rem;
	else
	bytes_rem[ZPOOL_WAIT_RESILVER] = rem;
	} else if (check_rebuilding(nvroot, NULL)) {
	bytes_rem[ZPOOL_WAIT_RESILVER] =
	vdev_activity_top_remaining(nvroot);
	}

	bytes_rem[ZPOOL_WAIT_INITIALIZE] =
	vdev_activity_remaining(nvroot, ZPOOL_WAIT_INITIALIZE);
	bytes_rem[ZPOOL_WAIT_TRIM] =
	vdev_activity_remaining(nvroot, ZPOOL_WAIT_TRIM);

	/*
	* A replace finishes after resilvering finishes, so the amount of work
	* left for a replace is the same as for resilvering.
	*
	* It isn't quite correct to say that if we have any 'spare' or
	* 'replacing' vdevs and a resilver is happening, then a replace is in
	* progress, like we do here. When a hot spare is used, the faulted vdev
	* is not removed after the hot spare is resilvered, so parent 'spare'
	* vdev is not removed either. So we could have a 'spare' vdev, but be
	* resilvering for a different reason. However, we use it as a heuristic
	* because we don't have access to the DTLs, which could tell us whether
	* or not we have really finished resilvering a hot spare.
	*/
	if (vdev_any_spare_replacing(nvroot))
	bytes_rem[ZPOOL_WAIT_REPLACE] = bytes_rem[ZPOOL_WAIT_RESILVER];

	if (timestamp_fmt != NODATE)
	print_timestamp(timestamp_fmt);

	for (i = 0; i < ZPOOL_WAIT_NUM_ACTIVITIES; i++) {
	char buf[64];
	if (!wd->wd_enabled[i])
	continue;

	if (wd->wd_exact)
	(void) snprintf(buf, sizeof (buf), "%" PRIi64,
	bytes_rem[i]);
	else
	zfs_nicenum(bytes_rem[i], buf, sizeof (buf));

	if (wd->wd_scripted)
	(void) printf(i == 0 ? "%s" : "\t%s", buf);
	else
	(void) printf(" %*s", col_widths[i] - 1, buf);
	}
	(void) printf("\n");
	(void) fflush(stdout);
	}

	static void *
	wait_status_thread(void *arg)
	{
	wait_data_t wd = (wait_data_t )arg;
	zpool_handle_t *zhp;

	if ((zhp = zpool_open(g_zfs, wd->wd_poolname)) == NULL)
	return (void *)(1);

	for (int row = 0; ; row++) {
	boolean_t missing;
	struct timespec timeout;
	int ret = 0;
	(void) clock_gettime(CLOCK_REALTIME, &timeout);

	if (zpool_refresh_stats(zhp, &missing) != 0 \|\| missing \|\|
	zpool_props_refresh(zhp) != 0) {
	zpool_close(zhp);
	return (void *)(uintptr_t)(missing ? 0 : 1);
	}

	print_wait_status_row(wd, zhp, row);

	timeout.tv_sec += floor(wd->wd_interval);
	long nanos = timeout.tv_nsec +
	(wd->wd_interval - floor(wd->wd_interval)) * NANOSEC;
	if (nanos >= NANOSEC) {
	timeout.tv_sec++;
	timeout.tv_nsec = nanos - NANOSEC;
	} else {
	timeout.tv_nsec = nanos;
	}
	pthread_mutex_lock(&wd->wd_mutex);
	if (!wd->wd_should_exit)
	ret = pthread_cond_timedwait(&wd->wd_cv, &wd->wd_mutex,
	&timeout);
	pthread_mutex_unlock(&wd->wd_mutex);
	if (ret == 0) {
	break; /* signaled by main thread */
	} else if (ret != ETIMEDOUT) {
	(void) fprintf(stderr, gettext("pthread_cond_timedwait "
	"failed: %s\n"), strerror(ret));
	zpool_close(zhp);
	return (void *)(uintptr_t)(1);
	}
	}

	zpool_close(zhp);
	return (void *)(0);
	}

	int
	zpool_do_wait(int argc, char **argv)
	{
	boolean_t verbose = B_FALSE;
	int c;
	char *value;
	int i;
	unsigned long count;
	pthread_t status_thr;
	int error = 0;
	zpool_handle_t *zhp;

	wait_data_t wd;
	wd.wd_scripted = B_FALSE;
	wd.wd_exact = B_FALSE;
	wd.wd_headers_once = B_FALSE;
	wd.wd_should_exit = B_FALSE;

	pthread_mutex_init(&wd.wd_mutex, NULL);
	pthread_cond_init(&wd.wd_cv, NULL);

	/* By default, wait for all types of activity. */
	for (i = 0; i < ZPOOL_WAIT_NUM_ACTIVITIES; i++)
	wd.wd_enabled[i] = B_TRUE;

	while ((c = getopt(argc, argv, "HpT:t:")) != -1) {
	switch (c) {
	case 'H':
	wd.wd_scripted = B_TRUE;
	break;
	case 'n':
	wd.wd_headers_once = B_TRUE;
	break;
	case 'p':
	wd.wd_exact = B_TRUE;
	break;
	case 'T':
	get_timestamp_arg(*optarg);
	break;
	case 't':
	{
	static char *col_subopts[] = { "discard", "free",
	"initialize", "replace", "remove", "resilver",
	"scrub", "trim", NULL };

	/* Reset activities array */
	bzero(&wd.wd_enabled, sizeof (wd.wd_enabled));
	while (*optarg != '\0') {
	int activity = getsubopt(&optarg, col_subopts,
	&value);

	if (activity < 0) {
	(void) fprintf(stderr,
	gettext("invalid activity '%s'\n"),
	value);
	usage(B_FALSE);
	}

	wd.wd_enabled[activity] = B_TRUE;
	}
	break;
	}
	case '?':
	(void) fprintf(stderr, gettext("invalid option '%c'\n"),
	optopt);
	usage(B_FALSE);
	}
	}

	argc -= optind;
	argv += optind;

	get_interval_count(&argc, argv, &wd.wd_interval, &count);
	if (count != 0) {
	/* This subcmd only accepts an interval, not a count */
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	if (wd.wd_interval != 0)
	verbose = B_TRUE;

	if (argc < 1) {
	(void) fprintf(stderr, gettext("missing 'pool' argument\n"));
	usage(B_FALSE);
	}
	if (argc > 1) {
	(void) fprintf(stderr, gettext("too many arguments\n"));
	usage(B_FALSE);
	}

	wd.wd_poolname = argv[0];

	if ((zhp = zpool_open(g_zfs, wd.wd_poolname)) == NULL)
	return (1);

	if (verbose) {
	/*
	* We use a separate thread for printing status updates because
	* the main thread will call lzc_wait(), which blocks as long
	* as an activity is in progress, which can be a long time.
	*/
	if (pthread_create(&status_thr, NULL, wait_status_thread, &wd)
	!= 0) {
	(void) fprintf(stderr, gettext("failed to create status"
	"thread: %s\n"), strerror(errno));
	zpool_close(zhp);
	return (1);
	}
	}

	/*
	* Loop over all activities that we are supposed to wait for until none
	* of them are in progress. Note that this means we can end up waiting
	* for more activities to complete than just those that were in progress
	* when we began waiting; if an activity we are interested in begins
	* while we are waiting for another activity, we will wait for both to
	* complete before exiting.
	*/
	for (;;) {
	boolean_t missing = B_FALSE;
	boolean_t any_waited = B_FALSE;

	for (i = 0; i < ZPOOL_WAIT_NUM_ACTIVITIES; i++) {
	boolean_t waited;

	if (!wd.wd_enabled[i])
	continue;

	error = zpool_wait_status(zhp, i, &missing, &waited);
	if (error != 0 \|\| missing)
	break;

	any_waited = (any_waited \|\| waited);
	}

	if (error != 0 \|\| missing \|\| !any_waited)
	break;
	}

	zpool_close(zhp);

	if (verbose) {
	uintptr_t status;
	pthread_mutex_lock(&wd.wd_mutex);
	wd.wd_should_exit = B_TRUE;
	pthread_cond_signal(&wd.wd_cv);
	pthread_mutex_unlock(&wd.wd_mutex);
	(void) pthread_join(status_thr, (void *)&status);
	if (status != 0)
	error = status;
	}

	pthread_mutex_destroy(&wd.wd_mutex);
	pthread_cond_destroy(&wd.wd_cv);
	return (error);
	}

	static int
	find_command_idx(char command, int idx)
	{
	int i;

	for (i = 0; i < NCOMMAND; i++) {
	if (command_table[i].name == NULL)
	continue;

	if (strcmp(command, command_table[i].name) == 0) {
	*idx = i;
	return (0);
	}
	}
	return (1);
	}

	/*
	* Display version message
	*/
	static int
	zpool_do_version(int argc, char **argv)
	{
	if (zfs_version_print() == -1)
	return (1);

	return (0);
	}

	/*
	* Do zpool_load_compat() and print error message on failure
	*/
	static zpool_compat_status_t
	zpool_do_load_compat(const char compat, boolean_t list)
	{
	char report[1024];

	zpool_compat_status_t ret;

	ret = zpool_load_compat(compat, list, report, 1024);
	switch (ret) {

	case ZPOOL_COMPATIBILITY_OK:
	break;

	case ZPOOL_COMPATIBILITY_NOFILES:
	case ZPOOL_COMPATIBILITY_BADFILE:
	case ZPOOL_COMPATIBILITY_BADTOKEN:
	(void) fprintf(stderr, "Error: %s\n", report);
	break;

	case ZPOOL_COMPATIBILITY_WARNTOKEN:
	(void) fprintf(stderr, "Warning: %s\n", report);
	ret = ZPOOL_COMPATIBILITY_OK;
	break;
	}
	return (ret);
	}

	int
	main(int argc, char **argv)
	{
	int ret = 0;
	int i = 0;
	char *cmdname;
	char **newargv;

	(void) setlocale(LC_ALL, "");
	(void) setlocale(LC_NUMERIC, "C");
	(void) textdomain(TEXT_DOMAIN);
	srand(time(NULL));

	opterr = 0;

	/*
	* Make sure the user has specified some command.
	*/
	if (argc < 2) {
	(void) fprintf(stderr, gettext("missing command\n"));
	usage(B_FALSE);
	}

	cmdname = argv[1];

	/*
	* Special case '-?'
	*/
	if ((strcmp(cmdname, "-?") == 0) \|\| strcmp(cmdname, "--help") == 0)
	usage(B_TRUE);

	/*
	* Special case '-V\|--version'
	*/
	if ((strcmp(cmdname, "-V") == 0) \|\| (strcmp(cmdname, "--version") == 0))
	return (zpool_do_version(argc, argv));

	if ((g_zfs = libzfs_init()) == NULL) {
	(void) fprintf(stderr, "%s\n", libzfs_error_init(errno));
	return (1);
	}

	libzfs_print_on_error(g_zfs, B_TRUE);

	zfs_save_arguments(argc, argv, history_str, sizeof (history_str));

	/*
	* Many commands modify input strings for string parsing reasons.
	* We create a copy to protect the original argv.
	*/
	newargv = malloc((argc + 1) * sizeof (newargv[0]));
	for (i = 0; i < argc; i++)
	newargv[i] = strdup(argv[i]);
	newargv[argc] = NULL;

	/*
	* Run the appropriate command.
	*/
	if (find_command_idx(cmdname, &i) == 0) {
	current_command = &command_table[i];
	ret = command_table[i].func(argc - 1, newargv + 1);
	} else if (strchr(cmdname, '=')) {
	verify(find_command_idx("set", &i) == 0);
	current_command = &command_table[i];
	ret = command_table[i].func(argc, newargv);
	} else if (strcmp(cmdname, "freeze") == 0 && argc == 3) {
	/*
	* 'freeze' is a vile debugging abomination, so we treat
	* it as such.
	*/
	zfs_cmd_t zc = {"\0"};

	(void) strlcpy(zc.zc_name, argv[2], sizeof (zc.zc_name));
	ret = zfs_ioctl(g_zfs, ZFS_IOC_POOL_FREEZE, &zc);
	if (ret != 0) {
	(void) fprintf(stderr,
	gettext("failed to freeze pool: %d\n"), errno);
	ret = 1;
	}

	log_history = 0;
	} else {
	(void) fprintf(stderr, gettext("unrecognized "
	"command '%s'\n"), cmdname);
	usage(B_FALSE);
	ret = 1;
	}

	for (i = 0; i < argc; i++)
	free(newargv[i]);
	free(newargv);

	if (ret == 0 && log_history)
	(void) zpool_log_history(g_zfs, history_str);

	libzfs_fini(g_zfs);

	/*
	* The 'ZFS_ABORT' environment variable causes us to dump core on exit
	* for the purposes of running ::findleaks.
	*/
	if (getenv("ZFS_ABORT") != NULL) {
	(void) printf("dumping core by request\n");
	abort();
	}

	return (ret);
	}
	diff --git a/sys/contrib/openzfs/cmd/zpool_influxdb/zpool_influxdb.c b/sys/contrib/openzfs/cmd/zpool_influxdb/zpool_influxdb.c
	index 71ffcb25381a..35c4770a1c14 100644
	--- a/sys/contrib/openzfs/cmd/zpool_influxdb/zpool_influxdb.c
	+++ b/sys/contrib/openzfs/cmd/zpool_influxdb/zpool_influxdb.c
	@@ -1,843 +1,842 @@
	/*
	* Gather top-level ZFS pool and resilver/scan statistics and print using
	* influxdb line protocol
	* usage: [options] [pool_name]
	* where options are:
	* --execd, -e run in telegraf execd input plugin mode, [CR] on
	* stdin causes a sample to be printed and wait for
	* the next [CR]
	* --no-histograms, -n don't print histogram data (reduces cardinality
	* if you don't care about histograms)
	* --sum-histogram-buckets, -s sum histogram bucket values
	*
	* To integrate into telegraf use one of:
	* 1. the `inputs.execd` plugin with the `--execd` option
	* 2. the `inputs.exec` plugin to simply run with no options
	*
	* NOTE: libzfs is an unstable interface. YMMV.
	*
	* The design goals of this software include:
	* + be as lightweight as possible
	* + reduce the number of external dependencies as far as possible, hence
	* there is no dependency on a client library for managing the metric
	* collection -- info is printed, KISS
	* + broken pools or kernel bugs can cause this process to hang in an
	* unkillable state. For this reason, it is best to keep the damage limited
	* to a small process like zpool_influxdb rather than a larger collector.
	*
	* Copyright 2018-2020 Richard Elling
	*
	* This software is dual-licensed MIT and CDDL.
	*
	* The MIT License (MIT)
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License Version 1.0 (CDDL-1.0).
	* You can obtain a copy of the license from the top-level file
	* "OPENSOLARIS.LICENSE" or at <http://opensource.org/licenses/CDDL-1.0>.
	* You may not use this file except in compliance with the license.
	*
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* CDDL HEADER END
	*/
	#include <string.h>
	#include <getopt.h>
	#include <stdio.h>
	#include <stdint.h>
	#include <inttypes.h>
	#include <libzfs_impl.h>

	#define POOL_MEASUREMENT "zpool_stats"
	#define SCAN_MEASUREMENT "zpool_scan_stats"
	#define VDEV_MEASUREMENT "zpool_vdev_stats"
	#define POOL_LATENCY_MEASUREMENT "zpool_latency"
	#define POOL_QUEUE_MEASUREMENT "zpool_vdev_queue"
	#define MIN_LAT_INDEX 10 /* minimum latency index 10 = 1024ns */
	#define POOL_IO_SIZE_MEASUREMENT "zpool_io_size"
	#define MIN_SIZE_INDEX 9 /* minimum size index 9 = 512 bytes */

	/* global options */
	int execd_mode = 0;
	int no_histograms = 0;
	int sum_histogram_buckets = 0;
	char metric_data_type = 'u';
	uint64_t metric_value_mask = UINT64_MAX;
	uint64_t timestamp = 0;
	int complained_about_sync = 0;
	char *tags = "";

	typedef int (stat_printer_f)(nvlist_t , const char , const char );

	/*
	* influxdb line protocol rules for escaping are important because the
	* zpool name can include characters that need to be escaped
	*
	* caller is responsible for freeing result
	*/
	static char *
	escape_string(char *s)
	{
	char c, d;
	char t = (char )malloc(ZFS_MAX_DATASET_NAME_LEN * 2);
	if (t == NULL) {
	fprintf(stderr, "error: cannot allocate memory\n");
	exit(1);
	}

	for (c = s, d = t; *c != '\0'; c++, d++) {
	switch (*c) {
	case ' ':
	case ',':
	case '=':
	case '\\':
	*d++ = '\\';
	default:
	d = c;
	}
	}
	*d = '\0';
	return (t);
	}

	/*
	* print key=value where value is a uint64_t
	*/
	static void
	print_kv(char *key, uint64_t value)
	{
	printf("%s=%llu%c", key,
	(u_longlong_t)value & metric_value_mask, metric_data_type);
	}

	/*
	* print_scan_status() prints the details as often seen in the "zpool status"
	* output. However, unlike the zpool command, which is intended for humans,
	* this output is suitable for long-term tracking in influxdb.
	* TODO: update to include issued scan data
	*/
	static int
	print_scan_status(nvlist_t nvroot, const char pool_name)
	{
	uint_t c;
	int64_t elapsed;
	uint64_t examined, pass_exam, paused_time, paused_ts, rate;
	uint64_t remaining_time;
	pool_scan_stat_t *ps = NULL;
	double pct_done;
	char *state[DSS_NUM_STATES] = {
	"none", "scanning", "finished", "canceled"};
	char *func;

	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_SCAN_STATS,
	(uint64_t **)&ps, &c);

	/*
	* ignore if there are no stats
	*/
	if (ps == NULL)
	return (0);

	/*
	* return error if state is bogus
	*/
	if (ps->pss_state >= DSS_NUM_STATES \|\|
	ps->pss_func >= POOL_SCAN_FUNCS) {
	if (complained_about_sync % 1000 == 0) {
	fprintf(stderr, "error: cannot decode scan stats: "
	"ZFS is out of sync with compiled zpool_influxdb");
	complained_about_sync++;
	}
	return (1);
	}

	switch (ps->pss_func) {
	case POOL_SCAN_NONE:
	func = "none_requested";
	break;
	case POOL_SCAN_SCRUB:
	func = "scrub";
	break;
	case POOL_SCAN_RESILVER:
	func = "resilver";
	break;
	#ifdef POOL_SCAN_REBUILD
	case POOL_SCAN_REBUILD:
	func = "rebuild";
	break;
	#endif
	default:
	func = "scan";
	}

	/* overall progress */
	examined = ps->pss_examined ? ps->pss_examined : 1;
	pct_done = 0.0;
	if (ps->pss_to_examine > 0)
	pct_done = 100.0 * examined / ps->pss_to_examine;

	#ifdef EZFS_SCRUB_PAUSED
	paused_ts = ps->pss_pass_scrub_pause;
	paused_time = ps->pss_pass_scrub_spent_paused;
	#else
	paused_ts = 0;
	paused_time = 0;
	#endif

	/* calculations for this pass */
	if (ps->pss_state == DSS_SCANNING) {
	elapsed = (int64_t)time(NULL) - (int64_t)ps->pss_pass_start -
	(int64_t)paused_time;
	elapsed = (elapsed > 0) ? elapsed : 1;
	pass_exam = ps->pss_pass_exam ? ps->pss_pass_exam : 1;
	rate = pass_exam / elapsed;
	rate = (rate > 0) ? rate : 1;
	remaining_time = ps->pss_to_examine - examined / rate;
	} else {
	elapsed =
	(int64_t)ps->pss_end_time - (int64_t)ps->pss_pass_start -
	(int64_t)paused_time;
	elapsed = (elapsed > 0) ? elapsed : 1;
	pass_exam = ps->pss_pass_exam ? ps->pss_pass_exam : 1;
	rate = pass_exam / elapsed;
	remaining_time = 0;
	}
	rate = rate ? rate : 1;

	/* influxdb line protocol format: "tags metrics timestamp" */
	printf("%s%s,function=%s,name=%s,state=%s ",
	SCAN_MEASUREMENT, tags, func, pool_name, state[ps->pss_state]);
	print_kv("end_ts", ps->pss_end_time);
	print_kv(",errors", ps->pss_errors);
	print_kv(",examined", examined);
	print_kv(",issued", ps->pss_issued);
	print_kv(",pass_examined", pass_exam);
	print_kv(",pass_issued", ps->pss_pass_issued);
	print_kv(",paused_ts", paused_ts);
	print_kv(",paused_t", paused_time);
	printf(",pct_done=%.2f", pct_done);
	print_kv(",processed", ps->pss_processed);
	print_kv(",rate", rate);
	print_kv(",remaining_t", remaining_time);
	print_kv(",start_ts", ps->pss_start_time);
	print_kv(",to_examine", ps->pss_to_examine);
	print_kv(",to_process", ps->pss_to_process);
	printf(" %llu\n", (u_longlong_t)timestamp);
	return (0);
	}

	/*
	* get a vdev name that corresponds to the top-level vdev names
	* printed by `zpool status`
	*/
	static char *
	get_vdev_name(nvlist_t nvroot, const char parent_name)
	{
	static char vdev_name[256];
	char *vdev_type = NULL;
	uint64_t vdev_id = 0;

	if (nvlist_lookup_string(nvroot, ZPOOL_CONFIG_TYPE,
	&vdev_type) != 0) {
	vdev_type = "unknown";
	}
	if (nvlist_lookup_uint64(
	nvroot, ZPOOL_CONFIG_ID, &vdev_id) != 0) {
	vdev_id = UINT64_MAX;
	}
	if (parent_name == NULL) {
	(void) snprintf(vdev_name, sizeof (vdev_name), "%s",
	vdev_type);
	} else {
	(void) snprintf(vdev_name, sizeof (vdev_name),
	"%s/%s-%llu",
	parent_name, vdev_type, (u_longlong_t)vdev_id);
	}
	return (vdev_name);
	}

	/*
	* get a string suitable for an influxdb tag that describes this vdev
	*
	* By default only the vdev hierarchical name is shown, separated by '/'
	* If the vdev has an associated path, which is typical of leaf vdevs,
	* then the path is added.
	* It would be nice to have the devid instead of the path, but under
	* Linux we cannot be sure a devid will exist and we'd rather have
	* something than nothing, so we'll use path instead.
	*/
	static char *
	get_vdev_desc(nvlist_t nvroot, const char parent_name)
	{
	static char vdev_desc[2 * MAXPATHLEN];
	char *vdev_type = NULL;
	uint64_t vdev_id = 0;
	char vdev_value[MAXPATHLEN];
	char *vdev_path = NULL;
	char s, t;

	if (nvlist_lookup_string(nvroot, ZPOOL_CONFIG_TYPE, &vdev_type) != 0) {
	vdev_type = "unknown";
	}
	if (nvlist_lookup_uint64(nvroot, ZPOOL_CONFIG_ID, &vdev_id) != 0) {
	vdev_id = UINT64_MAX;
	}
	if (nvlist_lookup_string(
	nvroot, ZPOOL_CONFIG_PATH, &vdev_path) != 0) {
	vdev_path = NULL;
	}

	if (parent_name == NULL) {
	s = escape_string(vdev_type);
	(void) snprintf(vdev_value, sizeof (vdev_value), "vdev=%s", s);
	free(s);
	} else {
	s = escape_string((char *)parent_name);
	t = escape_string(vdev_type);
	(void) snprintf(vdev_value, sizeof (vdev_value),
	"vdev=%s/%s-%llu", s, t, (u_longlong_t)vdev_id);
	free(s);
	free(t);
	}
	if (vdev_path == NULL) {
	(void) snprintf(vdev_desc, sizeof (vdev_desc), "%s",
	vdev_value);
	} else {
	s = escape_string(vdev_path);
	(void) snprintf(vdev_desc, sizeof (vdev_desc), "path=%s,%s",
	s, vdev_value);
	free(s);
	}
	return (vdev_desc);
	}

	/*
	* vdev summary stats are a combination of the data shown by
	* `zpool status` and `zpool list -v`
	*/
	static int
	print_summary_stats(nvlist_t nvroot, const char pool_name,
	const char *parent_name)
	{
	uint_t c;
	vdev_stat_t *vs;
	char *vdev_desc = NULL;
	vdev_desc = get_vdev_desc(nvroot, parent_name);
	if (nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &c) != 0) {
	return (1);
	}
	printf("%s%s,name=%s,state=%s,%s ", POOL_MEASUREMENT, tags,
	pool_name, zpool_state_to_name((vdev_state_t)vs->vs_state,
	(vdev_aux_t)vs->vs_aux), vdev_desc);
	print_kv("alloc", vs->vs_alloc);
	print_kv(",free", vs->vs_space - vs->vs_alloc);
	print_kv(",size", vs->vs_space);
	print_kv(",read_bytes", vs->vs_bytes[ZIO_TYPE_READ]);
	print_kv(",read_errors", vs->vs_read_errors);
	print_kv(",read_ops", vs->vs_ops[ZIO_TYPE_READ]);
	print_kv(",write_bytes", vs->vs_bytes[ZIO_TYPE_WRITE]);
	print_kv(",write_errors", vs->vs_write_errors);
	print_kv(",write_ops", vs->vs_ops[ZIO_TYPE_WRITE]);
	print_kv(",checksum_errors", vs->vs_checksum_errors);
	print_kv(",fragmentation", vs->vs_fragmentation);
	printf(" %llu\n", (u_longlong_t)timestamp);
	return (0);
	}

	/*
	* vdev latency stats are histograms stored as nvlist arrays of uint64.
	* Latency stats include the ZIO scheduler classes plus lower-level
	* vdev latencies.
	*
	* In many cases, the top-level "root" view obscures the underlying
	* top-level vdev operations. For example, if a pool has a log, special,
	* or cache device, then each can behave very differently. It is useful
	* to see how each is responding.
	*/
	static int
	print_vdev_latency_stats(nvlist_t nvroot, const char pool_name,
	const char *parent_name)
	{
	uint_t c, end = 0;
	nvlist_t *nv_ex;
	char *vdev_desc = NULL;

	/* short_names become part of the metric name and are influxdb-ready */
	struct lat_lookup {
	char *name;
	char *short_name;
	uint64_t sum;
	uint64_t *array;
	};
	struct lat_lookup lat_type[] = {
	{ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO, "total_read", 0},
	{ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO, "total_write", 0},
	{ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO, "disk_read", 0},
	{ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO, "disk_write", 0},
	{ZPOOL_CONFIG_VDEV_SYNC_R_LAT_HISTO, "sync_read", 0},
	{ZPOOL_CONFIG_VDEV_SYNC_W_LAT_HISTO, "sync_write", 0},
	{ZPOOL_CONFIG_VDEV_ASYNC_R_LAT_HISTO, "async_read", 0},
	{ZPOOL_CONFIG_VDEV_ASYNC_W_LAT_HISTO, "async_write", 0},
	{ZPOOL_CONFIG_VDEV_SCRUB_LAT_HISTO, "scrub", 0},
	#ifdef ZPOOL_CONFIG_VDEV_TRIM_LAT_HISTO
	{ZPOOL_CONFIG_VDEV_TRIM_LAT_HISTO, "trim", 0},
	#endif
	{NULL, NULL}
	};

	if (nvlist_lookup_nvlist(nvroot,
	ZPOOL_CONFIG_VDEV_STATS_EX, &nv_ex) != 0) {
	return (6);
	}

	vdev_desc = get_vdev_desc(nvroot, parent_name);

	for (int i = 0; lat_type[i].name; i++) {
	if (nvlist_lookup_uint64_array(nv_ex,
	lat_type[i].name, &lat_type[i].array, &c) != 0) {
	fprintf(stderr, "error: can't get %s\n",
	lat_type[i].name);
	return (3);
	}
	/* end count count, all of the arrays are the same size */
	end = c - 1;
	}

	for (int bucket = 0; bucket <= end; bucket++) {
	if (bucket < MIN_LAT_INDEX) {
	/* don't print, but collect the sum */
	for (int i = 0; lat_type[i].name; i++) {
	lat_type[i].sum += lat_type[i].array[bucket];
	}
	continue;
	}
	if (bucket < end) {
	printf("%s%s,le=%0.6f,name=%s,%s ",
	POOL_LATENCY_MEASUREMENT, tags,
	(float)(1ULL << bucket) * 1e-9,
	pool_name, vdev_desc);
	} else {
	printf("%s%s,le=+Inf,name=%s,%s ",
	POOL_LATENCY_MEASUREMENT, tags, pool_name,
	vdev_desc);
	}
	for (int i = 0; lat_type[i].name; i++) {
	if (bucket <= MIN_LAT_INDEX \|\| sum_histogram_buckets) {
	lat_type[i].sum += lat_type[i].array[bucket];
	} else {
	lat_type[i].sum = lat_type[i].array[bucket];
	}
	print_kv(lat_type[i].short_name, lat_type[i].sum);
	if (lat_type[i + 1].name != NULL) {
	printf(",");
	}
	}
	printf(" %llu\n", (u_longlong_t)timestamp);
	}
	return (0);
	}

	/*
	* vdev request size stats are histograms stored as nvlist arrays of uint64.
	* Request size stats include the ZIO scheduler classes plus lower-level
	* vdev sizes. Both independent (ind) and aggregated (agg) sizes are reported.
	*
	* In many cases, the top-level "root" view obscures the underlying
	* top-level vdev operations. For example, if a pool has a log, special,
	* or cache device, then each can behave very differently. It is useful
	* to see how each is responding.
	*/
	static int
	print_vdev_size_stats(nvlist_t nvroot, const char pool_name,
	const char *parent_name)
	{
	uint_t c, end = 0;
	nvlist_t *nv_ex;
	char *vdev_desc = NULL;

	/* short_names become the field name */
	struct size_lookup {
	char *name;
	char *short_name;
	uint64_t sum;
	uint64_t *array;
	};
	struct size_lookup size_type[] = {
	{ZPOOL_CONFIG_VDEV_SYNC_IND_R_HISTO, "sync_read_ind"},
	{ZPOOL_CONFIG_VDEV_SYNC_IND_W_HISTO, "sync_write_ind"},
	{ZPOOL_CONFIG_VDEV_ASYNC_IND_R_HISTO, "async_read_ind"},
	{ZPOOL_CONFIG_VDEV_ASYNC_IND_W_HISTO, "async_write_ind"},
	{ZPOOL_CONFIG_VDEV_IND_SCRUB_HISTO, "scrub_read_ind"},
	{ZPOOL_CONFIG_VDEV_SYNC_AGG_R_HISTO, "sync_read_agg"},
	{ZPOOL_CONFIG_VDEV_SYNC_AGG_W_HISTO, "sync_write_agg"},
	{ZPOOL_CONFIG_VDEV_ASYNC_AGG_R_HISTO, "async_read_agg"},
	{ZPOOL_CONFIG_VDEV_ASYNC_AGG_W_HISTO, "async_write_agg"},
	{ZPOOL_CONFIG_VDEV_AGG_SCRUB_HISTO, "scrub_read_agg"},
	#ifdef ZPOOL_CONFIG_VDEV_IND_TRIM_HISTO
	{ZPOOL_CONFIG_VDEV_IND_TRIM_HISTO, "trim_write_ind"},
	{ZPOOL_CONFIG_VDEV_AGG_TRIM_HISTO, "trim_write_agg"},
	#endif
	{NULL, NULL}
	};

	if (nvlist_lookup_nvlist(nvroot,
	ZPOOL_CONFIG_VDEV_STATS_EX, &nv_ex) != 0) {
	return (6);
	}

	vdev_desc = get_vdev_desc(nvroot, parent_name);

	for (int i = 0; size_type[i].name; i++) {
	if (nvlist_lookup_uint64_array(nv_ex, size_type[i].name,
	&size_type[i].array, &c) != 0) {
	fprintf(stderr, "error: can't get %s\n",
	size_type[i].name);
	return (3);
	}
	/* end count count, all of the arrays are the same size */
	end = c - 1;
	}

	for (int bucket = 0; bucket <= end; bucket++) {
	if (bucket < MIN_SIZE_INDEX) {
	/* don't print, but collect the sum */
	for (int i = 0; size_type[i].name; i++) {
	size_type[i].sum += size_type[i].array[bucket];
	}
	continue;
	}

	if (bucket < end) {
	printf("%s%s,le=%llu,name=%s,%s ",
	POOL_IO_SIZE_MEASUREMENT, tags, 1ULL << bucket,
	pool_name, vdev_desc);
	} else {
	printf("%s%s,le=+Inf,name=%s,%s ",
	POOL_IO_SIZE_MEASUREMENT, tags, pool_name,
	vdev_desc);
	}
	for (int i = 0; size_type[i].name; i++) {
	if (bucket <= MIN_SIZE_INDEX \|\| sum_histogram_buckets) {
	size_type[i].sum += size_type[i].array[bucket];
	} else {
	size_type[i].sum = size_type[i].array[bucket];
	}
	print_kv(size_type[i].short_name, size_type[i].sum);
	if (size_type[i + 1].name != NULL) {
	printf(",");
	}
	}
	printf(" %llu\n", (u_longlong_t)timestamp);
	}
	return (0);
	}

	/*
	* ZIO scheduler queue stats are stored as gauges. This is unfortunate
	* because the values can change very rapidly and any point-in-time
	* value will quickly be obsoleted. It is also not easy to downsample.
	* Thus only the top-level queue stats might be beneficial... maybe.
	*/
	static int
	print_queue_stats(nvlist_t nvroot, const char pool_name,
	const char *parent_name)
	{
	nvlist_t *nv_ex;
	uint64_t value;

	/* short_names are used for the field name */
	struct queue_lookup {
	char *name;
	char *short_name;
	};
	struct queue_lookup queue_type[] = {
	{ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE, "sync_r_active"},
	{ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE, "sync_w_active"},
	{ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE, "async_r_active"},
	{ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE, "async_w_active"},
	{ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE, "async_scrub_active"},
	{ZPOOL_CONFIG_VDEV_SYNC_R_PEND_QUEUE, "sync_r_pend"},
	{ZPOOL_CONFIG_VDEV_SYNC_W_PEND_QUEUE, "sync_w_pend"},
	{ZPOOL_CONFIG_VDEV_ASYNC_R_PEND_QUEUE, "async_r_pend"},
	{ZPOOL_CONFIG_VDEV_ASYNC_W_PEND_QUEUE, "async_w_pend"},
	{ZPOOL_CONFIG_VDEV_SCRUB_PEND_QUEUE, "async_scrub_pend"},
	{NULL, NULL}
	};

	if (nvlist_lookup_nvlist(nvroot,
	ZPOOL_CONFIG_VDEV_STATS_EX, &nv_ex) != 0) {
	return (6);
	}

	printf("%s%s,name=%s,%s ", POOL_QUEUE_MEASUREMENT, tags, pool_name,
	get_vdev_desc(nvroot, parent_name));
	for (int i = 0; queue_type[i].name; i++) {
	if (nvlist_lookup_uint64(nv_ex,
	queue_type[i].name, &value) != 0) {
	fprintf(stderr, "error: can't get %s\n",
	queue_type[i].name);
	return (3);
	}
	print_kv(queue_type[i].short_name, value);
	if (queue_type[i + 1].name != NULL) {
	printf(",");
	}
	}
	printf(" %llu\n", (u_longlong_t)timestamp);
	return (0);
	}

	/*
	* top-level vdev stats are at the pool level
	*/
	static int
	print_top_level_vdev_stats(nvlist_t nvroot, const char pool_name)
	{
	nvlist_t *nv_ex;
	uint64_t value;

	/* short_names become part of the metric name */
	struct queue_lookup {
	char *name;
	char *short_name;
	};
	struct queue_lookup queue_type[] = {
	{ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE, "sync_r_active_queue"},
	{ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE, "sync_w_active_queue"},
	{ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE, "async_r_active_queue"},
	{ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE, "async_w_active_queue"},
	{ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE, "async_scrub_active_queue"},
	{ZPOOL_CONFIG_VDEV_SYNC_R_PEND_QUEUE, "sync_r_pend_queue"},
	{ZPOOL_CONFIG_VDEV_SYNC_W_PEND_QUEUE, "sync_w_pend_queue"},
	{ZPOOL_CONFIG_VDEV_ASYNC_R_PEND_QUEUE, "async_r_pend_queue"},
	{ZPOOL_CONFIG_VDEV_ASYNC_W_PEND_QUEUE, "async_w_pend_queue"},
	{ZPOOL_CONFIG_VDEV_SCRUB_PEND_QUEUE, "async_scrub_pend_queue"},
	{NULL, NULL}
	};

	if (nvlist_lookup_nvlist(nvroot,
	ZPOOL_CONFIG_VDEV_STATS_EX, &nv_ex) != 0) {
	return (6);
	}

	printf("%s%s,name=%s,vdev=root ", VDEV_MEASUREMENT, tags,
	pool_name);
	for (int i = 0; queue_type[i].name; i++) {
	if (nvlist_lookup_uint64(nv_ex,
	queue_type[i].name, &value) != 0) {
	fprintf(stderr, "error: can't get %s\n",
	queue_type[i].name);
	return (3);
	}
	if (i > 0)
	printf(",");
	print_kv(queue_type[i].short_name, value);
	}

	printf(" %llu\n", (u_longlong_t)timestamp);
	return (0);
	}

	/*
	* recursive stats printer
	*/
	static int
	print_recursive_stats(stat_printer_f func, nvlist_t *nvroot,
	const char pool_name, const char parent_name, int descend)
	{
	uint_t c, children;
	nvlist_t **child;
	char vdev_name[256];
	int err;

	err = func(nvroot, pool_name, parent_name);
	if (err)
	return (err);

	if (descend && nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	&child, &children) == 0) {
	- (void) strncpy(vdev_name, get_vdev_name(nvroot, parent_name),
	+ (void) strlcpy(vdev_name, get_vdev_name(nvroot, parent_name),
	sizeof (vdev_name));
	- vdev_name[sizeof (vdev_name) - 1] = '\0';

	for (c = 0; c < children; c++) {
	print_recursive_stats(func, child[c], pool_name,
	vdev_name, descend);
	}
	}
	return (0);
	}

	/*
	* call-back to print the stats from the pool config
	*
	* Note: if the pool is broken, this can hang indefinitely and perhaps in an
	* unkillable state.
	*/
	static int
	print_stats(zpool_handle_t zhp, void data)
	{
	uint_t c;
	int err;
	boolean_t missing;
	nvlist_t config, nvroot;
	vdev_stat_t *vs;
	struct timespec tv;
	char *pool_name;

	/* if not this pool return quickly */
	if (data &&
	strncmp(data, zhp->zpool_name, ZFS_MAX_DATASET_NAME_LEN) != 0) {
	zpool_close(zhp);
	return (0);
	}

	if (zpool_refresh_stats(zhp, &missing) != 0) {
	zpool_close(zhp);
	return (1);
	}

	config = zpool_get_config(zhp, NULL);
	if (clock_gettime(CLOCK_REALTIME, &tv) != 0)
	timestamp = (uint64_t)time(NULL) * 1000000000;
	else
	timestamp =
	((uint64_t)tv.tv_sec * 1000000000) + (uint64_t)tv.tv_nsec;

	if (nvlist_lookup_nvlist(
	config, ZPOOL_CONFIG_VDEV_TREE, &nvroot) != 0) {
	zpool_close(zhp);
	return (2);
	}
	if (nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &c) != 0) {
	zpool_close(zhp);
	return (3);
	}

	pool_name = escape_string(zhp->zpool_name);
	err = print_recursive_stats(print_summary_stats, nvroot,
	pool_name, NULL, 1);
	/* if any of these return an error, skip the rest */
	if (err == 0)
	err = print_top_level_vdev_stats(nvroot, pool_name);

	if (no_histograms == 0) {
	if (err == 0)
	err = print_recursive_stats(print_vdev_latency_stats, nvroot,
	pool_name, NULL, 1);
	if (err == 0)
	err = print_recursive_stats(print_vdev_size_stats, nvroot,
	pool_name, NULL, 1);
	if (err == 0)
	err = print_recursive_stats(print_queue_stats, nvroot,
	pool_name, NULL, 0);
	}
	if (err == 0)
	err = print_scan_status(nvroot, pool_name);

	free(pool_name);
	zpool_close(zhp);
	return (err);
	}

	static void
	usage(char *name)
	{
	fprintf(stderr, "usage: %s [--execd][--no-histograms]"
	"[--sum-histogram-buckets] [--signed-int] [poolname]\n", name);
	exit(EXIT_FAILURE);
	}

	int
	main(int argc, char *argv[])
	{
	int opt;
	int ret = 8;
	char *line = NULL;
	size_t len, tagslen = 0;
	struct option long_options[] = {
	{"execd", no_argument, NULL, 'e'},
	{"help", no_argument, NULL, 'h'},
	{"no-histograms", no_argument, NULL, 'n'},
	{"signed-int", no_argument, NULL, 'i'},
	{"sum-histogram-buckets", no_argument, NULL, 's'},
	{"tags", required_argument, NULL, 't'},
	{0, 0, 0, 0}
	};
	while ((opt = getopt_long(
	argc, argv, "ehinst:", long_options, NULL)) != -1) {
	switch (opt) {
	case 'e':
	execd_mode = 1;
	break;
	case 'i':
	metric_data_type = 'i';
	metric_value_mask = INT64_MAX;
	break;
	case 'n':
	no_histograms = 1;
	break;
	case 's':
	sum_histogram_buckets = 1;
	break;
	case 't':
	tagslen = strlen(optarg) + 2;
	tags = calloc(tagslen, 1);
	if (tags == NULL) {
	fprintf(stderr,
	"error: cannot allocate memory "
	"for tags\n");
	exit(1);
	}
	(void) snprintf(tags, tagslen, ",%s", optarg);
	break;
	default:
	usage(argv[0]);
	}
	}

	libzfs_handle_t *g_zfs;
	if ((g_zfs = libzfs_init()) == NULL) {
	fprintf(stderr,
	"error: cannot initialize libzfs. "
	"Is the zfs module loaded or zrepl running?\n");
	exit(EXIT_FAILURE);
	}
	if (execd_mode == 0) {
	ret = zpool_iter(g_zfs, print_stats, argv[optind]);
	return (ret);
	}
	while (getline(&line, &len, stdin) != -1) {
	ret = zpool_iter(g_zfs, print_stats, argv[optind]);
	fflush(stdout);
	}
	return (ret);
	}
	diff --git a/sys/contrib/openzfs/cmd/zvol_id/zvol_id_main.c b/sys/contrib/openzfs/cmd/zvol_id/zvol_id_main.c
	index 4a2d74cc203c..22f2e848cba1 100644
	--- a/sys/contrib/openzfs/cmd/zvol_id/zvol_id_main.c
	+++ b/sys/contrib/openzfs/cmd/zvol_id/zvol_id_main.c
	@@ -1,110 +1,114 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2011, Fajar A. Nugraha. All rights reserved.
	* Use is subject to license terms.
	*/

	#include <ctype.h>
	#include <string.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <linux/ioctl.h>
	#include <sys/stat.h>
	#include <sys/ioctl.h>
	#include <sys/zfs_znode.h>
	#include <sys/fs/zfs.h>

	static int
	ioctl_get_msg(char *var, int fd)
	{
	- int error = 0;
	+ int ret;
	char msg[ZFS_MAX_DATASET_NAME_LEN];

	- error = ioctl(fd, BLKZNAME, msg);
	- if (error < 0) {
	- return (error);
	+ ret = ioctl(fd, BLKZNAME, msg);
	+ if (ret < 0) {
	+ return (ret);
	}

	snprintf(var, ZFS_MAX_DATASET_NAME_LEN, "%s", msg);
	- return (error);
	+ return (ret);
	}

	int
	main(int argc, char **argv)
	{
	- int fd, error = 0;
	+ int fd = -1, ret = 0, status = EXIT_FAILURE;
	char zvol_name[ZFS_MAX_DATASET_NAME_LEN];
	char *zvol_name_part = NULL;
	char *dev_name;
	struct stat64 statbuf;
	int dev_minor, dev_part;
	int i;
	- int rc;

	if (argc < 2) {
	- printf("Usage: %s /dev/zvol_device_node\n", argv[0]);
	- return (EINVAL);
	+ fprintf(stderr, "Usage: %s /dev/zvol_device_node\n", argv[0]);
	+ goto fail;
	}

	dev_name = argv[1];
	- error = stat64(dev_name, &statbuf);
	- if (error != 0) {
	- printf("Unable to access device file: %s\n", dev_name);
	- return (errno);
	+ ret = stat64(dev_name, &statbuf);
	+ if (ret != 0) {
	+ fprintf(stderr, "Unable to access device file: %s\n", dev_name);
	+ goto fail;
	}

	dev_minor = minor(statbuf.st_rdev);
	dev_part = dev_minor % ZVOL_MINORS;

	fd = open(dev_name, O_RDONLY);
	if (fd < 0) {
	- printf("Unable to open device file: %s\n", dev_name);
	- return (errno);
	+ fprintf(stderr, "Unable to open device file: %s\n", dev_name);
	+ goto fail;
	}

	- error = ioctl_get_msg(zvol_name, fd);
	- if (error < 0) {
	- printf("ioctl_get_msg failed:%s\n", strerror(errno));
	- return (errno);
	+ ret = ioctl_get_msg(zvol_name, fd);
	+ if (ret < 0) {
	+ fprintf(stderr, "ioctl_get_msg failed: %s\n", strerror(errno));
	+ goto fail;
	}
	if (dev_part > 0)
	- rc = asprintf(&zvol_name_part, "%s-part%d", zvol_name,
	+ ret = asprintf(&zvol_name_part, "%s-part%d", zvol_name,
	dev_part);
	else
	- rc = asprintf(&zvol_name_part, "%s", zvol_name);
	+ ret = asprintf(&zvol_name_part, "%s", zvol_name);

	- if (rc == -1 \|\| zvol_name_part == NULL)
	- goto error;
	+ if (ret == -1 \|\| zvol_name_part == NULL)
	+ goto fail;

	for (i = 0; i < strlen(zvol_name_part); i++) {
	if (isblank(zvol_name_part[i]))
	zvol_name_part[i] = '+';
	}

	printf("%s\n", zvol_name_part);
	- free(zvol_name_part);
	-error:
	- close(fd);
	- return (error);
	+ status = EXIT_SUCCESS;
	+
	+fail:
	+ if (zvol_name_part)
	+ free(zvol_name_part);
	+ if (fd >= 0)
	+ close(fd);
	+
	+ return (status);
	}
	diff --git a/sys/contrib/openzfs/config/Abigail.am b/sys/contrib/openzfs/config/Abigail.am
	index 599f611942b0..94687b90eef2 100644
	--- a/sys/contrib/openzfs/config/Abigail.am
	+++ b/sys/contrib/openzfs/config/Abigail.am
	@@ -1,29 +1,33 @@
	#
	# When performing an ABI check the following options are applied:
	#
	# --no-unreferenced-symbols: Exclude symbols which are not referenced by
	# any debug information. Without this _init() and _fini() are incorrectly
	# reported on CentOS7 for libuutil.so.
	#
	# --headers-dir1: Limit ABI checks to public OpenZFS headers, otherwise
	# changes in public system headers are also reported.
	#
	# --suppressions: Honor a suppressions file for each library to provide
	# a mechanism for suppressing harmless warnings.
	#

	PHONY += checkabi storeabi

	checkabi:
	for lib in $(lib_LTLIBRARIES) ; do \
	abidiff --no-unreferenced-symbols \
	--headers-dir1 ../../include \
	--suppressions $${lib%.la}.suppr \
	$${lib%.la}.abi .libs/$${lib%.la}.so ; \
	done

	storeabi:
	cd .libs ; \
	for lib in $(lib_LTLIBRARIES) ; do \
	- abidw $${lib%.la}.so > ../$${lib%.la}.abi ; \
	+ abidw --no-show-locs \
	+ --no-corpus-path \
	+ --no-comp-dir-path \
	+ --type-id-style hash \
	+ $${lib%.la}.so > ../$${lib%.la}.abi ; \
	done
	diff --git a/sys/contrib/openzfs/config/kernel-acl.m4 b/sys/contrib/openzfs/config/kernel-acl.m4
	index c6da4df24eb9..a155b59d006a 100644
	--- a/sys/contrib/openzfs/config/kernel-acl.m4
	+++ b/sys/contrib/openzfs/config/kernel-acl.m4
	@@ -1,310 +1,331 @@
	dnl #
	dnl # Check if posix_acl_release can be used from a ZFS_META_LICENSED
	dnl # module. The is_owner_or_cap macro was replaced by
	dnl # inode_owner_or_capable
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_POSIX_ACL_RELEASE], [
	ZFS_LINUX_TEST_SRC([posix_acl_release], [
	#include <linux/cred.h>
	#include <linux/fs.h>
	#include <linux/posix_acl.h>
	], [
	struct posix_acl *tmp = posix_acl_alloc(1, 0);
	posix_acl_release(tmp);
	], [], [ZFS_META_LICENSE])
	])

	AC_DEFUN([ZFS_AC_KERNEL_POSIX_ACL_RELEASE], [
	AC_MSG_CHECKING([whether posix_acl_release() is available])
	ZFS_LINUX_TEST_RESULT([posix_acl_release], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_POSIX_ACL_RELEASE, 1,
	[posix_acl_release() is available])

	AC_MSG_CHECKING([whether posix_acl_release() is GPL-only])
	ZFS_LINUX_TEST_RESULT([posix_acl_release_license], [
	AC_MSG_RESULT(no)
	],[
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_POSIX_ACL_RELEASE_GPL_ONLY, 1,
	[posix_acl_release() is GPL-only])
	])
	],[
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # 3.14 API change,
	dnl # set_cached_acl() and forget_cached_acl() changed from inline to
	dnl # EXPORT_SYMBOL. In the former case, they may not be usable because of
	dnl # posix_acl_release. In the latter case, we can always use them.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_SET_CACHED_ACL_USABLE], [
	ZFS_LINUX_TEST_SRC([set_cached_acl], [
	#include <linux/cred.h>
	#include <linux/fs.h>
	#include <linux/posix_acl.h>
	], [
	struct inode *ip = NULL;
	struct posix_acl *acl = posix_acl_alloc(1, 0);
	set_cached_acl(ip, ACL_TYPE_ACCESS, acl);
	forget_cached_acl(ip, ACL_TYPE_ACCESS);
	], [], [ZFS_META_LICENSE])
	])

	AC_DEFUN([ZFS_AC_KERNEL_SET_CACHED_ACL_USABLE], [
	AC_MSG_CHECKING([whether set_cached_acl() is usable])
	ZFS_LINUX_TEST_RESULT([set_cached_acl_license], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_SET_CACHED_ACL_USABLE, 1,
	[set_cached_acl() is usable])
	],[
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # 3.1 API change,
	dnl # posix_acl_chmod() was added as the preferred interface.
	dnl #
	dnl # 3.14 API change,
	dnl # posix_acl_chmod() was changed to __posix_acl_chmod()
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_POSIX_ACL_CHMOD], [
	ZFS_LINUX_TEST_SRC([posix_acl_chmod], [
	#include <linux/fs.h>
	#include <linux/posix_acl.h>
	],[
	posix_acl_chmod(NULL, 0, 0)
	])

	ZFS_LINUX_TEST_SRC([__posix_acl_chmod], [
	#include <linux/fs.h>
	#include <linux/posix_acl.h>
	],[
	__posix_acl_chmod(NULL, 0, 0)
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_POSIX_ACL_CHMOD], [
	AC_MSG_CHECKING([whether __posix_acl_chmod exists])
	ZFS_LINUX_TEST_RESULT([__posix_acl_chmod], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE___POSIX_ACL_CHMOD, 1,
	[__posix_acl_chmod() exists])
	],[
	AC_MSG_RESULT(no)

	AC_MSG_CHECKING([whether posix_acl_chmod exists])
	ZFS_LINUX_TEST_RESULT([posix_acl_chmod], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_POSIX_ACL_CHMOD, 1,
	[posix_acl_chmod() exists])
	],[
	ZFS_LINUX_TEST_ERROR([posix_acl_chmod()])
	])
	])
	])

	dnl #
	dnl # 3.1 API change,
	dnl # posix_acl_equiv_mode now wants an umode_t instead of a mode_t
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T], [
	ZFS_LINUX_TEST_SRC([posix_acl_equiv_mode], [
	#include <linux/fs.h>
	#include <linux/posix_acl.h>
	],[
	umode_t tmp;
	posix_acl_equiv_mode(NULL, &tmp);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T], [
	AC_MSG_CHECKING([whether posix_acl_equiv_mode() wants umode_t])
	ZFS_LINUX_TEST_RESULT([posix_acl_equiv_mode], [
	AC_MSG_RESULT(yes)
	],[
	ZFS_LINUX_TEST_ERROR([posix_acl_equiv_mode()])
	])
	])

	dnl #
	dnl # 4.8 API change,
	dnl # The function posix_acl_valid now must be passed a namespace.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_POSIX_ACL_VALID_WITH_NS], [
	ZFS_LINUX_TEST_SRC([posix_acl_valid_with_ns], [
	#include <linux/fs.h>
	#include <linux/posix_acl.h>
	],[
	struct user_namespace *user_ns = NULL;
	const struct posix_acl *acl = NULL;
	int error;

	error = posix_acl_valid(user_ns, acl);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_POSIX_ACL_VALID_WITH_NS], [
	AC_MSG_CHECKING([whether posix_acl_valid() wants user namespace])
	ZFS_LINUX_TEST_RESULT([posix_acl_valid_with_ns], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_POSIX_ACL_VALID_WITH_NS, 1,
	[posix_acl_valid() wants user namespace])
	],[
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # 3.1 API change,
	dnl # Check if inode_operations contains the function get_acl
	dnl #
	+dnl # 5.15 API change,
	+dnl # Added the bool rcu argument to get_acl for rcu path walk.
	+dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_GET_ACL], [
	ZFS_LINUX_TEST_SRC([inode_operations_get_acl], [
	#include <linux/fs.h>

	struct posix_acl get_acl_fn(struct inode inode, int type)
	{ return NULL; }

	static const struct inode_operations
	iops __attribute__ ((unused)) = {
	.get_acl = get_acl_fn,
	};
	],[])
	+
	+ ZFS_LINUX_TEST_SRC([inode_operations_get_acl_rcu], [
	+ #include <linux/fs.h>
	+
	+ struct posix_acl get_acl_fn(struct inode inode, int type,
	+ bool rcu) { return NULL; }
	+
	+ static const struct inode_operations
	+ iops __attribute__ ((unused)) = {
	+ .get_acl = get_acl_fn,
	+ };
	+ ],[])
	])

	AC_DEFUN([ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL], [
	AC_MSG_CHECKING([whether iops->get_acl() exists])
	ZFS_LINUX_TEST_RESULT([inode_operations_get_acl], [
	AC_MSG_RESULT(yes)
	+ AC_DEFINE(HAVE_GET_ACL, 1, [iops->get_acl() exists])
	],[
	- ZFS_LINUX_TEST_ERROR([iops->get_acl()])
	+ ZFS_LINUX_TEST_RESULT([inode_operations_get_acl_rcu], [
	+ AC_MSG_RESULT(yes)
	+ AC_DEFINE(HAVE_GET_ACL_RCU, 1, [iops->get_acl() takes rcu])
	+ ],[
	+ ZFS_LINUX_TEST_ERROR([iops->get_acl()])
	+ ])
	])
	])

	dnl #
	dnl # 3.14 API change,
	dnl # Check if inode_operations contains the function set_acl
	dnl #
	dnl # 5.12 API change,
	dnl # set_acl() added a user_namespace* parameter first
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_SET_ACL], [
	ZFS_LINUX_TEST_SRC([inode_operations_set_acl_userns], [
	#include <linux/fs.h>

	int set_acl_fn(struct user_namespace *userns,
	struct inode inode, struct posix_acl acl,
	int type) { return 0; }

	static const struct inode_operations
	iops __attribute__ ((unused)) = {
	.set_acl = set_acl_fn,
	};
	],[])
	ZFS_LINUX_TEST_SRC([inode_operations_set_acl], [
	#include <linux/fs.h>

	int set_acl_fn(struct inode inode, struct posix_acl acl,
	int type) { return 0; }

	static const struct inode_operations
	iops __attribute__ ((unused)) = {
	.set_acl = set_acl_fn,
	};
	],[])
	])

	AC_DEFUN([ZFS_AC_KERNEL_INODE_OPERATIONS_SET_ACL], [
	AC_MSG_CHECKING([whether iops->set_acl() exists])
	ZFS_LINUX_TEST_RESULT([inode_operations_set_acl_userns], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_SET_ACL, 1, [iops->set_acl() exists])
	AC_DEFINE(HAVE_SET_ACL_USERNS, 1, [iops->set_acl() takes 4 args])
	],[
	ZFS_LINUX_TEST_RESULT([inode_operations_set_acl], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_SET_ACL, 1, [iops->set_acl() exists, takes 3 args])
	],[
	AC_MSG_RESULT(no)
	])
	])
	])

	dnl #
	dnl # 4.7 API change,
	dnl # The kernel get_acl will now check cache before calling i_op->get_acl and
	dnl # do set_cached_acl after that, so i_op->get_acl don't need to do that
	dnl # anymore.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_GET_ACL_HANDLE_CACHE], [
	ZFS_LINUX_TEST_SRC([get_acl_handle_cache], [
	#include <linux/fs.h>
	],[
	void *sentinel __attribute__ ((unused)) =
	uncached_acl_sentinel(NULL);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_GET_ACL_HANDLE_CACHE], [
	AC_MSG_CHECKING([whether uncached_acl_sentinel() exists])
	ZFS_LINUX_TEST_RESULT([get_acl_handle_cache], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_KERNEL_GET_ACL_HANDLE_CACHE, 1,
	[uncached_acl_sentinel() exists])
	],[
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # 4.16 kernel: check if struct posix_acl acl.a_refcount is a refcount_t.
	dnl # It's an atomic_t on older kernels.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_ACL_HAS_REFCOUNT], [
	ZFS_LINUX_TEST_SRC([acl_refcount], [
	#include <linux/backing-dev.h>
	#include <linux/refcount.h>
	#include <linux/posix_acl.h>
	],[
	struct posix_acl acl;
	refcount_t *r __attribute__ ((unused)) = &acl.a_refcount;
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_ACL_HAS_REFCOUNT], [
	AC_MSG_CHECKING([whether posix_acl has refcount_t])
	ZFS_LINUX_TEST_RESULT([acl_refcount], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_ACL_REFCOUNT, 1, [posix_acl has refcount_t])
	],[
	AC_MSG_RESULT(no)
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_SRC_ACL], [
	ZFS_AC_KERNEL_SRC_POSIX_ACL_RELEASE
	ZFS_AC_KERNEL_SRC_SET_CACHED_ACL_USABLE
	ZFS_AC_KERNEL_SRC_POSIX_ACL_CHMOD
	ZFS_AC_KERNEL_SRC_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T
	ZFS_AC_KERNEL_SRC_POSIX_ACL_VALID_WITH_NS
	ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_GET_ACL
	ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_SET_ACL
	ZFS_AC_KERNEL_SRC_GET_ACL_HANDLE_CACHE
	ZFS_AC_KERNEL_SRC_ACL_HAS_REFCOUNT
	])

	AC_DEFUN([ZFS_AC_KERNEL_ACL], [
	ZFS_AC_KERNEL_POSIX_ACL_RELEASE
	ZFS_AC_KERNEL_SET_CACHED_ACL_USABLE
	ZFS_AC_KERNEL_POSIX_ACL_CHMOD
	ZFS_AC_KERNEL_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T
	ZFS_AC_KERNEL_POSIX_ACL_VALID_WITH_NS
	ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL
	ZFS_AC_KERNEL_INODE_OPERATIONS_SET_ACL
	ZFS_AC_KERNEL_GET_ACL_HANDLE_CACHE
	ZFS_AC_KERNEL_ACL_HAS_REFCOUNT
	])
	diff --git a/sys/contrib/openzfs/config/kernel-blk-queue.m4 b/sys/contrib/openzfs/config/kernel-blk-queue.m4
	index 1dced82ce686..ff5d2d370e98 100644
	--- a/sys/contrib/openzfs/config/kernel-blk-queue.m4
	+++ b/sys/contrib/openzfs/config/kernel-blk-queue.m4
	@@ -1,302 +1,342 @@
	dnl #
	dnl # 2.6.39 API change,
	dnl # blk_start_plug() and blk_finish_plug()
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_PLUG], [
	ZFS_LINUX_TEST_SRC([blk_plug], [
	#include <linux/blkdev.h>
	],[
	struct blk_plug plug __attribute__ ((unused));

	blk_start_plug(&plug);
	blk_finish_plug(&plug);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_PLUG], [
	AC_MSG_CHECKING([whether struct blk_plug is available])
	ZFS_LINUX_TEST_RESULT([blk_plug], [
	AC_MSG_RESULT(yes)
	],[
	ZFS_LINUX_TEST_ERROR([blk_plug])
	])
	])

	dnl #
	dnl # 2.6.32 - 4.11: statically allocated bdi in request_queue
	dnl # 4.12: dynamically allocated bdi in request_queue
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_BDI], [
	ZFS_LINUX_TEST_SRC([blk_queue_bdi], [
	#include <linux/blkdev.h>
	],[
	struct request_queue q;
	struct backing_dev_info bdi;
	q.backing_dev_info = &bdi;
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_BDI], [
	AC_MSG_CHECKING([whether blk_queue bdi is dynamic])
	ZFS_LINUX_TEST_RESULT([blk_queue_bdi], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_BDI_DYNAMIC, 1,
	[blk queue backing_dev_info is dynamic])
	],[
	AC_MSG_RESULT(no)
	])
	])

	+dnl #
	+dnl # 5.9: added blk_queue_update_readahead(),
	+dnl # 5.15: renamed to disk_update_readahead()
	+dnl #
	+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_UPDATE_READAHEAD], [
	+ ZFS_LINUX_TEST_SRC([blk_queue_update_readahead], [
	+ #include <linux/blkdev.h>
	+ ],[
	+ struct request_queue q;
	+ blk_queue_update_readahead(&q);
	+ ])
	+
	+ ZFS_LINUX_TEST_SRC([disk_update_readahead], [
	+ #include <linux/blkdev.h>
	+ ],[
	+ struct gendisk disk;
	+ disk_update_readahead(&disk);
	+ ])
	+])
	+
	+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_UPDATE_READAHEAD], [
	+ AC_MSG_CHECKING([whether blk_queue_update_readahead() exists])
	+ ZFS_LINUX_TEST_RESULT([blk_queue_update_readahead], [
	+ AC_MSG_RESULT(yes)
	+ AC_DEFINE(HAVE_BLK_QUEUE_UPDATE_READAHEAD, 1,
	+ [blk_queue_update_readahead() exists])
	+ ],[
	+ AC_MSG_CHECKING([whether disk_update_readahead() exists])
	+ ZFS_LINUX_TEST_RESULT([disk_update_readahead], [
	+ AC_MSG_RESULT(yes)
	+ AC_DEFINE(HAVE_DISK_UPDATE_READAHEAD, 1,
	+ [disk_update_readahead() exists])
	+ ],[
	+ AC_MSG_RESULT(no)
	+ ])
	+ ])
	+])
	+
	dnl #
	dnl # 2.6.32 API,
	dnl # blk_queue_discard()
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_DISCARD], [
	ZFS_LINUX_TEST_SRC([blk_queue_discard], [
	#include <linux/blkdev.h>
	],[
	struct request_queue *q __attribute__ ((unused)) = NULL;
	int value __attribute__ ((unused));
	value = blk_queue_discard(q);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_DISCARD], [
	AC_MSG_CHECKING([whether blk_queue_discard() is available])
	ZFS_LINUX_TEST_RESULT([blk_queue_discard], [
	AC_MSG_RESULT(yes)
	],[
	ZFS_LINUX_TEST_ERROR([blk_queue_discard])
	])
	])

	dnl #
	dnl # 4.8 API,
	dnl # blk_queue_secure_erase()
	dnl #
	dnl # 2.6.36 - 4.7 API,
	dnl # blk_queue_secdiscard()
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_SECURE_ERASE], [
	ZFS_LINUX_TEST_SRC([blk_queue_secure_erase], [
	#include <linux/blkdev.h>
	],[
	struct request_queue *q __attribute__ ((unused)) = NULL;
	int value __attribute__ ((unused));
	value = blk_queue_secure_erase(q);
	])

	ZFS_LINUX_TEST_SRC([blk_queue_secdiscard], [
	#include <linux/blkdev.h>
	],[
	struct request_queue *q __attribute__ ((unused)) = NULL;
	int value __attribute__ ((unused));
	value = blk_queue_secdiscard(q);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_SECURE_ERASE], [
	AC_MSG_CHECKING([whether blk_queue_secure_erase() is available])
	ZFS_LINUX_TEST_RESULT([blk_queue_secure_erase], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_SECURE_ERASE, 1,
	[blk_queue_secure_erase() is available])
	],[
	AC_MSG_RESULT(no)

	AC_MSG_CHECKING([whether blk_queue_secdiscard() is available])
	ZFS_LINUX_TEST_RESULT([blk_queue_secdiscard], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_SECDISCARD, 1,
	[blk_queue_secdiscard() is available])
	],[
	ZFS_LINUX_TEST_ERROR([blk_queue_secure_erase])
	])
	])
	])

	dnl #
	dnl # 4.16 API change,
	dnl # Introduction of blk_queue_flag_set and blk_queue_flag_clear
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLAG_SET], [
	ZFS_LINUX_TEST_SRC([blk_queue_flag_set], [
	#include <linux/kernel.h>
	#include <linux/blkdev.h>
	],[
	struct request_queue *q = NULL;
	blk_queue_flag_set(0, q);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLAG_SET], [
	AC_MSG_CHECKING([whether blk_queue_flag_set() exists])
	ZFS_LINUX_TEST_RESULT([blk_queue_flag_set], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_FLAG_SET, 1,
	[blk_queue_flag_set() exists])
	],[
	AC_MSG_RESULT(no)
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLAG_CLEAR], [
	ZFS_LINUX_TEST_SRC([blk_queue_flag_clear], [
	#include <linux/kernel.h>
	#include <linux/blkdev.h>
	],[
	struct request_queue *q = NULL;
	blk_queue_flag_clear(0, q);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLAG_CLEAR], [
	AC_MSG_CHECKING([whether blk_queue_flag_clear() exists])
	ZFS_LINUX_TEST_RESULT([blk_queue_flag_clear], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_FLAG_CLEAR, 1,
	[blk_queue_flag_clear() exists])
	],[
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # 2.6.36 API change,
	dnl # Added blk_queue_flush() interface, while the previous interface
	dnl # was available to all the new one is GPL-only. Thus in addition to
	dnl # detecting if this function is available we determine if it is
	dnl # GPL-only. If the GPL-only interface is there we implement our own
	dnl # compatibility function, otherwise we use the function. The hope
	dnl # is that long term this function will be opened up.
	dnl #
	dnl # 4.7 API change,
	dnl # Replace blk_queue_flush with blk_queue_write_cache
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLUSH], [
	ZFS_LINUX_TEST_SRC([blk_queue_flush], [
	#include <linux/blkdev.h>
	], [
	struct request_queue *q = NULL;
	(void) blk_queue_flush(q, REQ_FLUSH);
	], [$NO_UNUSED_BUT_SET_VARIABLE], [ZFS_META_LICENSE])

	ZFS_LINUX_TEST_SRC([blk_queue_write_cache], [
	#include <linux/kernel.h>
	#include <linux/blkdev.h>
	], [
	struct request_queue *q = NULL;
	blk_queue_write_cache(q, true, true);
	], [$NO_UNUSED_BUT_SET_VARIABLE], [ZFS_META_LICENSE])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLUSH], [
	AC_MSG_CHECKING([whether blk_queue_flush() is available])
	ZFS_LINUX_TEST_RESULT([blk_queue_flush], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_FLUSH, 1,
	[blk_queue_flush() is available])

	AC_MSG_CHECKING([whether blk_queue_flush() is GPL-only])
	ZFS_LINUX_TEST_RESULT([blk_queue_flush_license], [
	AC_MSG_RESULT(no)
	],[
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY, 1,
	[blk_queue_flush() is GPL-only])
	])
	],[
	AC_MSG_RESULT(no)
	])

	dnl #
	dnl # 4.7 API change
	dnl # Replace blk_queue_flush with blk_queue_write_cache
	dnl #
	AC_MSG_CHECKING([whether blk_queue_write_cache() exists])
	ZFS_LINUX_TEST_RESULT([blk_queue_write_cache], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_WRITE_CACHE, 1,
	[blk_queue_write_cache() exists])

	AC_MSG_CHECKING([whether blk_queue_write_cache() is GPL-only])
	ZFS_LINUX_TEST_RESULT([blk_queue_write_cache_license], [
	AC_MSG_RESULT(no)
	],[
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLK_QUEUE_WRITE_CACHE_GPL_ONLY, 1,
	[blk_queue_write_cache() is GPL-only])
	])
	],[
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # 2.6.34 API change
	dnl # blk_queue_max_hw_sectors() replaces blk_queue_max_sectors().
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_MAX_HW_SECTORS], [
	ZFS_LINUX_TEST_SRC([blk_queue_max_hw_sectors], [
	#include <linux/blkdev.h>
	], [
	struct request_queue *q = NULL;
	(void) blk_queue_max_hw_sectors(q, BLK_SAFE_MAX_SECTORS);
	], [$NO_UNUSED_BUT_SET_VARIABLE])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS], [
	AC_MSG_CHECKING([whether blk_queue_max_hw_sectors() is available])
	ZFS_LINUX_TEST_RESULT([blk_queue_max_hw_sectors], [
	AC_MSG_RESULT(yes)
	],[
	ZFS_LINUX_TEST_ERROR([blk_queue_max_hw_sectors])
	])
	])

	dnl #
	dnl # 2.6.34 API change
	dnl # blk_queue_max_segments() consolidates blk_queue_max_hw_segments()
	dnl # and blk_queue_max_phys_segments().
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_MAX_SEGMENTS], [
	ZFS_LINUX_TEST_SRC([blk_queue_max_segments], [
	#include <linux/blkdev.h>
	], [
	struct request_queue *q = NULL;
	(void) blk_queue_max_segments(q, BLK_MAX_SEGMENTS);
	], [$NO_UNUSED_BUT_SET_VARIABLE])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS], [
	AC_MSG_CHECKING([whether blk_queue_max_segments() is available])
	ZFS_LINUX_TEST_RESULT([blk_queue_max_segments], [
	AC_MSG_RESULT(yes)
	], [
	ZFS_LINUX_TEST_ERROR([blk_queue_max_segments])
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE], [
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_PLUG
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_BDI
	+ ZFS_AC_KERNEL_SRC_BLK_QUEUE_UPDATE_READAHEAD
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_DISCARD
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_SECURE_ERASE
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLAG_SET
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLAG_CLEAR
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLUSH
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_MAX_HW_SECTORS
	ZFS_AC_KERNEL_SRC_BLK_QUEUE_MAX_SEGMENTS
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE], [
	ZFS_AC_KERNEL_BLK_QUEUE_PLUG
	ZFS_AC_KERNEL_BLK_QUEUE_BDI
	+ ZFS_AC_KERNEL_BLK_QUEUE_UPDATE_READAHEAD
	ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
	ZFS_AC_KERNEL_BLK_QUEUE_SECURE_ERASE
	ZFS_AC_KERNEL_BLK_QUEUE_FLAG_SET
	ZFS_AC_KERNEL_BLK_QUEUE_FLAG_CLEAR
	ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
	ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
	ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
	])
	diff --git a/sys/contrib/openzfs/config/kernel-blkdev.m4 b/sys/contrib/openzfs/config/kernel-blkdev.m4
	index 4b80d4dd29a5..61e66421f8ec 100644
	--- a/sys/contrib/openzfs/config/kernel-blkdev.m4
	+++ b/sys/contrib/openzfs/config/kernel-blkdev.m4
	@@ -1,321 +1,321 @@
	dnl #
	dnl # 2.6.38 API change,
	dnl # Added blkdev_get_by_path()
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH], [
	ZFS_LINUX_TEST_SRC([blkdev_get_by_path], [
	#include <linux/fs.h>
	#include <linux/blkdev.h>
	], [
	struct block_device *bdev __attribute__ ((unused)) = NULL;
	const char *path = "path";
	fmode_t mode = 0;
	void *holder = NULL;

	bdev = blkdev_get_by_path(path, mode, holder);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH], [
	AC_MSG_CHECKING([whether blkdev_get_by_path() exists])
	ZFS_LINUX_TEST_RESULT([blkdev_get_by_path], [
	AC_MSG_RESULT(yes)
	], [
	ZFS_LINUX_TEST_ERROR([blkdev_get_by_path()])
	])
	])

	dnl #
	dnl # 2.6.38 API change,
	dnl # Added blkdev_put()
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_PUT], [
	ZFS_LINUX_TEST_SRC([blkdev_put], [
	#include <linux/fs.h>
	#include <linux/blkdev.h>
	], [
	struct block_device *bdev = NULL;
	fmode_t mode = 0;

	blkdev_put(bdev, mode);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_PUT], [
	AC_MSG_CHECKING([whether blkdev_put() exists])
	ZFS_LINUX_TEST_RESULT([blkdev_put], [
	AC_MSG_RESULT(yes)
	], [
	ZFS_LINUX_TEST_ERROR([blkdev_put()])
	])
	])

	dnl #
	dnl # 4.1 API, exported blkdev_reread_part() symbol, back ported to the
	dnl # 3.10.0 CentOS 7.x enterprise kernels.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_REREAD_PART], [
	ZFS_LINUX_TEST_SRC([blkdev_reread_part], [
	#include <linux/fs.h>
	#include <linux/blkdev.h>
	], [
	struct block_device *bdev = NULL;
	int error;

	error = blkdev_reread_part(bdev);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_REREAD_PART], [
	AC_MSG_CHECKING([whether blkdev_reread_part() exists])
	ZFS_LINUX_TEST_RESULT([blkdev_reread_part], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BLKDEV_REREAD_PART, 1,
	[blkdev_reread_part() exists])
	], [
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # check_disk_change() was removed in 5.10
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_CHECK_DISK_CHANGE], [
	ZFS_LINUX_TEST_SRC([check_disk_change], [
	#include <linux/fs.h>
	#include <linux/blkdev.h>
	], [
	struct block_device *bdev = NULL;
	bool error;

	error = check_disk_change(bdev);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_CHECK_DISK_CHANGE], [
	AC_MSG_CHECKING([whether check_disk_change() exists])
	ZFS_LINUX_TEST_RESULT([check_disk_change], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_CHECK_DISK_CHANGE, 1,
	[check_disk_change() exists])
	], [
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # 5.10 API, check_disk_change() is removed, in favor of
	dnl # bdev_check_media_change(), which doesn't force revalidation
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_CHECK_MEDIA_CHANGE], [
	ZFS_LINUX_TEST_SRC([bdev_check_media_change], [
	#include <linux/fs.h>
	#include <linux/blkdev.h>
	], [
	struct block_device *bdev = NULL;
	int error;

	error = bdev_check_media_change(bdev);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_CHECK_MEDIA_CHANGE], [
	- AC_MSG_CHECKING([whether bdev_disk_changed() exists])
	+ AC_MSG_CHECKING([whether bdev_check_media_change() exists])
	ZFS_LINUX_TEST_RESULT([bdev_check_media_change], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BDEV_CHECK_MEDIA_CHANGE, 1,
	[bdev_check_media_change() exists])
	], [
	AC_MSG_RESULT(no)
	])
	])

	dnl #
	dnl # 2.6.22 API change
	dnl # Single argument invalidate_bdev()
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_INVALIDATE_BDEV], [
	ZFS_LINUX_TEST_SRC([invalidate_bdev], [
	#include <linux/buffer_head.h>
	#include <linux/blkdev.h>
	],[
	struct block_device *bdev = NULL;
	invalidate_bdev(bdev);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_INVALIDATE_BDEV], [
	AC_MSG_CHECKING([whether invalidate_bdev() exists])
	ZFS_LINUX_TEST_RESULT([invalidate_bdev], [
	AC_MSG_RESULT(yes)
	],[
	ZFS_LINUX_TEST_ERROR([invalidate_bdev()])
	])
	])

	dnl #
	dnl # 5.11 API, lookup_bdev() takes dev_t argument.
	dnl # 2.6.27 API, lookup_bdev() was first exported.
	dnl # 4.4.0-6.21 API, lookup_bdev() on Ubuntu takes mode argument.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_LOOKUP_BDEV], [
	ZFS_LINUX_TEST_SRC([lookup_bdev_devt], [
	#include <linux/blkdev.h>
	], [
	int error __attribute__ ((unused));
	const char path[] = "/example/path";
	dev_t dev;

	error = lookup_bdev(path, &dev);
	])

	ZFS_LINUX_TEST_SRC([lookup_bdev_1arg], [
	#include <linux/fs.h>
	#include <linux/blkdev.h>
	], [
	struct block_device *bdev __attribute__ ((unused));
	const char path[] = "/example/path";

	bdev = lookup_bdev(path);
	])

	ZFS_LINUX_TEST_SRC([lookup_bdev_mode], [
	#include <linux/fs.h>
	], [
	struct block_device *bdev __attribute__ ((unused));
	const char path[] = "/example/path";

	bdev = lookup_bdev(path, FMODE_READ);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_LOOKUP_BDEV], [
	AC_MSG_CHECKING([whether lookup_bdev() wants dev_t arg])
	ZFS_LINUX_TEST_RESULT_SYMBOL([lookup_bdev_devt],
	[lookup_bdev], [fs/block_dev.c], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_DEVT_LOOKUP_BDEV, 1,
	[lookup_bdev() wants dev_t arg])
	], [
	AC_MSG_RESULT(no)

	AC_MSG_CHECKING([whether lookup_bdev() wants 1 arg])
	ZFS_LINUX_TEST_RESULT_SYMBOL([lookup_bdev_1arg],
	[lookup_bdev], [fs/block_dev.c], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_1ARG_LOOKUP_BDEV, 1,
	[lookup_bdev() wants 1 arg])
	], [
	AC_MSG_RESULT(no)

	AC_MSG_CHECKING([whether lookup_bdev() wants mode arg])
	ZFS_LINUX_TEST_RESULT_SYMBOL([lookup_bdev_mode],
	[lookup_bdev], [fs/block_dev.c], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_MODE_LOOKUP_BDEV, 1,
	[lookup_bdev() wants mode arg])
	], [
	ZFS_LINUX_TEST_ERROR([lookup_bdev()])
	])
	])
	])
	])

	dnl #
	dnl # 2.6.30 API change
	dnl #
	dnl # The bdev_physical_block_size() interface was added to provide a way
	dnl # to determine the smallest write which can be performed without a
	dnl # read-modify-write operation.
	dnl #
	dnl # Unfortunately, this interface isn't entirely reliable because
	dnl # drives are sometimes known to misreport this value.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE], [
	ZFS_LINUX_TEST_SRC([bdev_physical_block_size], [
	#include <linux/blkdev.h>
	],[
	struct block_device *bdev __attribute__ ((unused)) = NULL;
	bdev_physical_block_size(bdev);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE], [
	AC_MSG_CHECKING([whether bdev_physical_block_size() is available])
	ZFS_LINUX_TEST_RESULT([bdev_physical_block_size], [
	AC_MSG_RESULT(yes)
	],[
	ZFS_LINUX_TEST_ERROR([bdev_physical_block_size()])
	])
	])

	dnl #
	dnl # 2.6.30 API change
	dnl # Added bdev_logical_block_size().
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE], [
	ZFS_LINUX_TEST_SRC([bdev_logical_block_size], [
	#include <linux/blkdev.h>
	],[
	struct block_device *bdev __attribute__ ((unused)) = NULL;
	bdev_logical_block_size(bdev);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE], [
	AC_MSG_CHECKING([whether bdev_logical_block_size() is available])
	ZFS_LINUX_TEST_RESULT([bdev_logical_block_size], [
	AC_MSG_RESULT(yes)
	],[
	ZFS_LINUX_TEST_ERROR([bdev_logical_block_size()])
	])
	])

	dnl #
	dnl # 5.11 API change
	dnl # Added bdev_whole() helper.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_WHOLE], [
	ZFS_LINUX_TEST_SRC([bdev_whole], [
	#include <linux/blkdev.h>
	],[
	struct block_device *bdev = NULL;
	bdev = bdev_whole(bdev);
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_WHOLE], [
	AC_MSG_CHECKING([whether bdev_whole() is available])
	ZFS_LINUX_TEST_RESULT([bdev_whole], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BDEV_WHOLE, 1, [bdev_whole() is available])
	],[
	AC_MSG_RESULT(no)
	])
	])

	AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
	ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH
	ZFS_AC_KERNEL_SRC_BLKDEV_PUT
	ZFS_AC_KERNEL_SRC_BLKDEV_REREAD_PART
	ZFS_AC_KERNEL_SRC_BLKDEV_INVALIDATE_BDEV
	ZFS_AC_KERNEL_SRC_BLKDEV_LOOKUP_BDEV
	ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE
	ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE
	ZFS_AC_KERNEL_SRC_BLKDEV_CHECK_DISK_CHANGE
	ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_CHECK_MEDIA_CHANGE
	ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_WHOLE
	])

	AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
	ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
	ZFS_AC_KERNEL_BLKDEV_PUT
	ZFS_AC_KERNEL_BLKDEV_REREAD_PART
	ZFS_AC_KERNEL_BLKDEV_INVALIDATE_BDEV
	ZFS_AC_KERNEL_BLKDEV_LOOKUP_BDEV
	ZFS_AC_KERNEL_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE
	ZFS_AC_KERNEL_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE
	ZFS_AC_KERNEL_BLKDEV_CHECK_DISK_CHANGE
	ZFS_AC_KERNEL_BLKDEV_BDEV_CHECK_MEDIA_CHANGE
	ZFS_AC_KERNEL_BLKDEV_BDEV_WHOLE
	])
	diff --git a/sys/contrib/openzfs/config/kernel-make-request-fn.m4 b/sys/contrib/openzfs/config/kernel-make-request-fn.m4
	index 290ef6b8da7d..86b202a7a272 100644
	--- a/sys/contrib/openzfs/config/kernel-make-request-fn.m4
	+++ b/sys/contrib/openzfs/config/kernel-make-request-fn.m4
	@@ -1,140 +1,160 @@
	dnl #
	dnl # Check for make_request_fn interface.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN], [
	ZFS_LINUX_TEST_SRC([make_request_fn_void], [
	#include <linux/blkdev.h>
	void make_request(struct request_queue *q,
	struct bio *bio) { return; }
	],[
	blk_queue_make_request(NULL, &make_request);
	])

	ZFS_LINUX_TEST_SRC([make_request_fn_blk_qc_t], [
	#include <linux/blkdev.h>
	blk_qc_t make_request(struct request_queue *q,
	struct bio *bio) { return (BLK_QC_T_NONE); }
	],[
	blk_queue_make_request(NULL, &make_request);
	])

	ZFS_LINUX_TEST_SRC([blk_alloc_queue_request_fn], [
	#include <linux/blkdev.h>
	blk_qc_t make_request(struct request_queue *q,
	struct bio *bio) { return (BLK_QC_T_NONE); }
	],[
	struct request_queue *q __attribute__ ((unused));
	q = blk_alloc_queue(make_request, NUMA_NO_NODE);
	])

	ZFS_LINUX_TEST_SRC([blk_alloc_queue_request_fn_rh], [
	#include <linux/blkdev.h>
	blk_qc_t make_request(struct request_queue *q,
	struct bio *bio) { return (BLK_QC_T_NONE); }
	],[
	struct request_queue *q __attribute__ ((unused));
	q = blk_alloc_queue_rh(make_request, NUMA_NO_NODE);
	])

	ZFS_LINUX_TEST_SRC([block_device_operations_submit_bio], [
	#include <linux/blkdev.h>
	],[
	struct block_device_operations o;
	o.submit_bio = NULL;
	])
	+
	+ ZFS_LINUX_TEST_SRC([blk_alloc_disk], [
	+ #include <linux/blkdev.h>
	+ ],[
	+ struct gendisk *disk __attribute__ ((unused));
	+ disk = blk_alloc_disk(NUMA_NO_NODE);
	+ ])
	])

	AC_DEFUN([ZFS_AC_KERNEL_MAKE_REQUEST_FN], [
	dnl # Checked as part of the blk_alloc_queue_request_fn test
	dnl #
	dnl # Linux 5.9 API Change
	dnl # make_request_fn was moved into block_device_operations->submit_bio
	dnl #
	AC_MSG_CHECKING([whether submit_bio is member of struct block_device_operations])
	ZFS_LINUX_TEST_RESULT([block_device_operations_submit_bio], [
	AC_MSG_RESULT(yes)

	AC_DEFINE(HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS, 1,
	[submit_bio is member of struct block_device_operations])
	+
	+ dnl #
	+ dnl # Linux 5.14 API Change:
	+ dnl # blk_alloc_queue() + alloc_disk() combo replaced by
	+ dnl # a single call to blk_alloc_disk().
	+ dnl #
	+ AC_MSG_CHECKING([whether blk_alloc_disk() exists])
	+ ZFS_LINUX_TEST_RESULT([blk_alloc_disk], [
	+ AC_MSG_RESULT(yes)
	+ AC_DEFINE([HAVE_BLK_ALLOC_DISK], 1, [blk_alloc_disk() exists])
	+ ], [
	+ AC_MSG_RESULT(no)
	+ ])
	],[
	AC_MSG_RESULT(no)

	dnl # Checked as part of the blk_alloc_queue_request_fn test
	dnl #
	dnl # Linux 5.7 API Change
	dnl # blk_alloc_queue() expects request function.
	dnl #
	AC_MSG_CHECKING([whether blk_alloc_queue() expects request function])
	ZFS_LINUX_TEST_RESULT([blk_alloc_queue_request_fn], [
	AC_MSG_RESULT(yes)

	dnl # This is currently always the case.
	AC_MSG_CHECKING([whether make_request_fn() returns blk_qc_t])
	AC_MSG_RESULT(yes)

	AC_DEFINE(HAVE_BLK_ALLOC_QUEUE_REQUEST_FN, 1,
	[blk_alloc_queue() expects request function])
	AC_DEFINE(MAKE_REQUEST_FN_RET, blk_qc_t,
	[make_request_fn() return type])
	AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_QC, 1,
	[Noting that make_request_fn() returns blk_qc_t])
	],[
	dnl #
	dnl # CentOS Stream 4.18.0-257 API Change
	dnl # The Linux 5.7 blk_alloc_queue() change was back-
	dnl # ported and the symbol renamed blk_alloc_queue_rh().
	dnl # As of this kernel version they're not providing
	dnl # any compatibility code in the kernel for this.
	dnl #
	ZFS_LINUX_TEST_RESULT([blk_alloc_queue_request_fn_rh], [
	AC_MSG_RESULT(yes)

	dnl # This is currently always the case.
	AC_MSG_CHECKING([whether make_request_fn_rh() returns blk_qc_t])
	AC_MSG_RESULT(yes)

	AC_DEFINE(HAVE_BLK_ALLOC_QUEUE_REQUEST_FN_RH, 1,
	[blk_alloc_queue_rh() expects request function])
	AC_DEFINE(MAKE_REQUEST_FN_RET, blk_qc_t,
	[make_request_fn() return type])
	AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_QC, 1,
	[Noting that make_request_fn() returns blk_qc_t])
	],[
	AC_MSG_RESULT(no)

	dnl #
	dnl # Linux 3.2 API Change
	dnl # make_request_fn returns void.
	dnl #
	AC_MSG_CHECKING(
	[whether make_request_fn() returns void])
	ZFS_LINUX_TEST_RESULT([make_request_fn_void], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(MAKE_REQUEST_FN_RET, void,
	[make_request_fn() return type])
	AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_VOID, 1,
	[Noting that make_request_fn() returns void])
	],[
	AC_MSG_RESULT(no)

	dnl #
	dnl # Linux 4.4 API Change
	dnl # make_request_fn returns blk_qc_t.
	dnl #
	AC_MSG_CHECKING(
	[whether make_request_fn() returns blk_qc_t])
	ZFS_LINUX_TEST_RESULT([make_request_fn_blk_qc_t], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(MAKE_REQUEST_FN_RET, blk_qc_t,
	[make_request_fn() return type])
	AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_QC, 1,
	[Noting that make_request_fn() ]
	[returns blk_qc_t])
	],[
	ZFS_LINUX_TEST_ERROR([make_request_fn])
	])
	])
	])
	])
	])
	])
	diff --git a/sys/contrib/openzfs/config/kernel-stdarg.m4 b/sys/contrib/openzfs/config/kernel-stdarg.m4
	new file mode 100644
	index 000000000000..5bc8dd859d6b
	--- /dev/null
	+++ b/sys/contrib/openzfs/config/kernel-stdarg.m4
	@@ -0,0 +1,32 @@
	+dnl #
	+dnl # Linux 5.15 gets rid of -isystem and external <stdarg.h> inclusion
	+dnl # and ships its own <linux/stdarg.h>. Check if this header file does
	+dnl # exist and provide all necessary definitions for variable argument
	+dnl # functions. Adjust the inclusion of <stdarg.h> according to the
	+dnl # results.
	+dnl #
	+AC_DEFUN([ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG], [
	+ ZFS_LINUX_TEST_SRC([has_standalone_linux_stdarg], [
	+ #include <linux/stdarg.h>
	+
	+ #if !defined(va_start) \|\| !defined(va_end) \|\| \
	+ !defined(va_arg) \|\| !defined(va_copy)
	+ #error "<linux/stdarg.h> is invalid"
	+ #endif
	+ ],[])
	+])
	+
	+AC_DEFUN([ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG], [
	+ dnl #
	+ dnl # Linux 5.15 ships its own stdarg.h and doesn't allow to
	+ dnl # include compiler headers.
	+ dnl #
	+ AC_MSG_CHECKING([whether standalone <linux/stdarg.h> exists])
	+ ZFS_LINUX_TEST_RESULT([has_standalone_linux_stdarg], [
	+ AC_MSG_RESULT([yes])
	+ AC_DEFINE(HAVE_STANDALONE_LINUX_STDARG, 1,
	+ [standalone <linux/stdarg.h> exists])
	+ ],[
	+ AC_MSG_RESULT([no])
	+ ])
	+])
	diff --git a/sys/contrib/openzfs/config/kernel-vfs-set_page_dirty.m4 b/sys/contrib/openzfs/config/kernel-vfs-set_page_dirty.m4
	new file mode 100644
	index 000000000000..a9d252e4e01e
	--- /dev/null
	+++ b/sys/contrib/openzfs/config/kernel-vfs-set_page_dirty.m4
	@@ -0,0 +1,34 @@
	+dnl #
	+dnl # Linux 5.14 adds a change to require set_page_dirty to be manually
	+dnl # wired up in struct address_space_operations. Determine if this needs
	+dnl # to be done. This patch set also introduced __set_page_dirty_nobuffers
	+dnl # declaration in linux/pagemap.h, so these tests look for the presence
	+dnl # of that function to tell the compiler to assign set_page_dirty in
	+dnl # module/os/linux/zfs/zpl_file.c
	+dnl #
	+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS], [
	+ ZFS_LINUX_TEST_SRC([vfs_has_set_page_dirty_nobuffers], [
	+ #include <linux/pagemap.h>
	+ #include <linux/fs.h>
	+
	+ static const struct address_space_operations
	+ aops __attribute__ ((unused)) = {
	+ .set_page_dirty = __set_page_dirty_nobuffers,
	+ };
	+ ],[])
	+])
	+
	+AC_DEFUN([ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS], [
	+ dnl #
	+ dnl # Linux 5.14 change requires set_page_dirty() to be assigned
	+ dnl # in address_space_operations()
	+ dnl #
	+ AC_MSG_CHECKING([__set_page_dirty_nobuffers exists])
	+ ZFS_LINUX_TEST_RESULT([vfs_has_set_page_dirty_nobuffers], [
	+ AC_MSG_RESULT([yes])
	+ AC_DEFINE(HAVE_VFS_SET_PAGE_DIRTY_NOBUFFERS, 1,
	+ [__set_page_dirty_nobuffers exists])
	+ ],[
	+ AC_MSG_RESULT([no])
	+ ])
	+])
	diff --git a/sys/contrib/openzfs/config/kernel.m4 b/sys/contrib/openzfs/config/kernel.m4
	index 7196e66ca28a..0b94f3bd9cb6 100644
	--- a/sys/contrib/openzfs/config/kernel.m4
	+++ b/sys/contrib/openzfs/config/kernel.m4
	@@ -1,887 +1,891 @@
	dnl #
	dnl # Default ZFS kernel configuration
	dnl #
	AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	AM_COND_IF([BUILD_LINUX], [
	dnl # Setup the kernel build environment.
	ZFS_AC_KERNEL
	ZFS_AC_QAT

	dnl # Sanity checks for module building and CONFIG_* defines
	ZFS_AC_KERNEL_TEST_MODULE
	ZFS_AC_KERNEL_CONFIG_DEFINED

	dnl # Sequential ZFS_LINUX_TRY_COMPILE tests
	ZFS_AC_KERNEL_FPU_HEADER
	ZFS_AC_KERNEL_OBJTOOL_HEADER
	ZFS_AC_KERNEL_WAIT_QUEUE_ENTRY_T
	ZFS_AC_KERNEL_MISC_MINOR
	ZFS_AC_KERNEL_DECLARE_EVENT_CLASS

	dnl # Parallel ZFS_LINUX_TEST_SRC / ZFS_LINUX_TEST_RESULT tests
	ZFS_AC_KERNEL_TEST_SRC
	ZFS_AC_KERNEL_TEST_RESULT

	AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
	KERNEL_MAKE="$KERNEL_MAKE O=$LINUX_OBJ"
	])

	AC_SUBST(KERNEL_MAKE)
	])
	])

	dnl #
	dnl # Generate and compile all of the kernel API test cases to determine
	dnl # which interfaces are available. By invoking the kernel build system
	dnl # only once the compilation can be done in parallel significantly
	dnl # speeding up the process.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
	ZFS_AC_KERNEL_SRC_OBJTOOL
	ZFS_AC_KERNEL_SRC_GLOBAL_PAGE_STATE
	ZFS_AC_KERNEL_SRC_ACCESS_OK_TYPE
	ZFS_AC_KERNEL_SRC_PDE_DATA
	ZFS_AC_KERNEL_SRC_FALLOCATE
	ZFS_AC_KERNEL_SRC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
	ZFS_AC_KERNEL_SRC_RWSEM
	ZFS_AC_KERNEL_SRC_SCHED
	ZFS_AC_KERNEL_SRC_USLEEP_RANGE
	ZFS_AC_KERNEL_SRC_KMEM_CACHE
	ZFS_AC_KERNEL_SRC_KVMALLOC
	ZFS_AC_KERNEL_SRC_VMALLOC_PAGE_KERNEL
	ZFS_AC_KERNEL_SRC_WAIT
	ZFS_AC_KERNEL_SRC_INODE_TIMES
	ZFS_AC_KERNEL_SRC_INODE_LOCK
	ZFS_AC_KERNEL_SRC_GROUP_INFO_GID
	ZFS_AC_KERNEL_SRC_RW
	ZFS_AC_KERNEL_SRC_TIMER_SETUP
	ZFS_AC_KERNEL_SRC_SUPER_USER_NS
	ZFS_AC_KERNEL_SRC_PROC_OPERATIONS
	ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS
	ZFS_AC_KERNEL_SRC_BIO
	ZFS_AC_KERNEL_SRC_BLKDEV
	ZFS_AC_KERNEL_SRC_BLK_QUEUE
	ZFS_AC_KERNEL_SRC_REVALIDATE_DISK
	ZFS_AC_KERNEL_SRC_GET_DISK_RO
	ZFS_AC_KERNEL_SRC_GENERIC_READLINK_GLOBAL
	ZFS_AC_KERNEL_SRC_DISCARD_GRANULARITY
	ZFS_AC_KERNEL_SRC_INODE_OWNER_OR_CAPABLE
	ZFS_AC_KERNEL_SRC_XATTR
	ZFS_AC_KERNEL_SRC_ACL
	ZFS_AC_KERNEL_SRC_INODE_GETATTR
	ZFS_AC_KERNEL_SRC_INODE_SET_FLAGS
	ZFS_AC_KERNEL_SRC_INODE_SET_IVERSION
	ZFS_AC_KERNEL_SRC_SHOW_OPTIONS
	ZFS_AC_KERNEL_SRC_FILE_INODE
	ZFS_AC_KERNEL_SRC_FILE_DENTRY
	ZFS_AC_KERNEL_SRC_FSYNC
	ZFS_AC_KERNEL_SRC_AIO_FSYNC
	ZFS_AC_KERNEL_SRC_EVICT_INODE
	ZFS_AC_KERNEL_SRC_DIRTY_INODE
	ZFS_AC_KERNEL_SRC_SHRINKER
	ZFS_AC_KERNEL_SRC_MKDIR
	ZFS_AC_KERNEL_SRC_LOOKUP_FLAGS
	ZFS_AC_KERNEL_SRC_CREATE
	ZFS_AC_KERNEL_SRC_GET_LINK
	ZFS_AC_KERNEL_SRC_PUT_LINK
	ZFS_AC_KERNEL_SRC_TMPFILE
	ZFS_AC_KERNEL_SRC_AUTOMOUNT
	ZFS_AC_KERNEL_SRC_ENCODE_FH_WITH_INODE
	ZFS_AC_KERNEL_SRC_COMMIT_METADATA
	ZFS_AC_KERNEL_SRC_CLEAR_INODE
	ZFS_AC_KERNEL_SRC_SETATTR_PREPARE
	ZFS_AC_KERNEL_SRC_INSERT_INODE_LOCKED
	ZFS_AC_KERNEL_SRC_DENTRY
	ZFS_AC_KERNEL_SRC_TRUNCATE_SETSIZE
	ZFS_AC_KERNEL_SRC_SECURITY_INODE
	ZFS_AC_KERNEL_SRC_FST_MOUNT
	ZFS_AC_KERNEL_SRC_BDI
	ZFS_AC_KERNEL_SRC_SET_NLINK
	ZFS_AC_KERNEL_SRC_SGET
	ZFS_AC_KERNEL_SRC_LSEEK_EXECUTE
	ZFS_AC_KERNEL_SRC_VFS_GETATTR
	ZFS_AC_KERNEL_SRC_VFS_FSYNC_2ARGS
	ZFS_AC_KERNEL_SRC_VFS_ITERATE
	ZFS_AC_KERNEL_SRC_VFS_DIRECT_IO
	ZFS_AC_KERNEL_SRC_VFS_RW_ITERATE
	ZFS_AC_KERNEL_SRC_VFS_GENERIC_WRITE_CHECKS
	ZFS_AC_KERNEL_SRC_VFS_IOV_ITER
	ZFS_AC_KERNEL_SRC_KMAP_ATOMIC_ARGS
	ZFS_AC_KERNEL_SRC_FOLLOW_DOWN_ONE
	ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN
	ZFS_AC_KERNEL_SRC_GENERIC_IO_ACCT
	ZFS_AC_KERNEL_SRC_FPU
	ZFS_AC_KERNEL_SRC_FMODE_T
	ZFS_AC_KERNEL_SRC_KUIDGID_T
	ZFS_AC_KERNEL_SRC_KUID_HELPERS
	ZFS_AC_KERNEL_SRC_MODULE_PARAM_CALL_CONST
	ZFS_AC_KERNEL_SRC_RENAME
	ZFS_AC_KERNEL_SRC_CURRENT_TIME
	ZFS_AC_KERNEL_SRC_USERNS_CAPABILITIES
	ZFS_AC_KERNEL_SRC_IN_COMPAT_SYSCALL
	ZFS_AC_KERNEL_SRC_KTIME
	ZFS_AC_KERNEL_SRC_TOTALRAM_PAGES_FUNC
	ZFS_AC_KERNEL_SRC_TOTALHIGH_PAGES
	ZFS_AC_KERNEL_SRC_KSTRTOUL
	ZFS_AC_KERNEL_SRC_PERCPU
	ZFS_AC_KERNEL_SRC_CPU_HOTPLUG
	ZFS_AC_KERNEL_SRC_GENERIC_FILLATTR_USERNS
	ZFS_AC_KERNEL_SRC_MKNOD
	ZFS_AC_KERNEL_SRC_SYMLINK
	ZFS_AC_KERNEL_SRC_BIO_MAX_SEGS
	ZFS_AC_KERNEL_SRC_SIGNAL_STOP
	ZFS_AC_KERNEL_SRC_SIGINFO
	ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE
	+ ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS
	+ ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG

	AC_MSG_CHECKING([for available kernel interfaces])
	ZFS_LINUX_TEST_COMPILE_ALL([kabi])
	AC_MSG_RESULT([done])
	])

	dnl #
	dnl # Check results of kernel interface tests.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
	ZFS_AC_KERNEL_ACCESS_OK_TYPE
	ZFS_AC_KERNEL_GLOBAL_PAGE_STATE
	ZFS_AC_KERNEL_OBJTOOL
	ZFS_AC_KERNEL_PDE_DATA
	ZFS_AC_KERNEL_FALLOCATE
	ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
	ZFS_AC_KERNEL_RWSEM
	ZFS_AC_KERNEL_SCHED
	ZFS_AC_KERNEL_USLEEP_RANGE
	ZFS_AC_KERNEL_KMEM_CACHE
	ZFS_AC_KERNEL_KVMALLOC
	ZFS_AC_KERNEL_VMALLOC_PAGE_KERNEL
	ZFS_AC_KERNEL_WAIT
	ZFS_AC_KERNEL_INODE_TIMES
	ZFS_AC_KERNEL_INODE_LOCK
	ZFS_AC_KERNEL_GROUP_INFO_GID
	ZFS_AC_KERNEL_RW
	ZFS_AC_KERNEL_TIMER_SETUP
	ZFS_AC_KERNEL_SUPER_USER_NS
	ZFS_AC_KERNEL_PROC_OPERATIONS
	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS
	ZFS_AC_KERNEL_BIO
	ZFS_AC_KERNEL_BLKDEV
	ZFS_AC_KERNEL_BLK_QUEUE
	ZFS_AC_KERNEL_REVALIDATE_DISK
	ZFS_AC_KERNEL_GET_DISK_RO
	ZFS_AC_KERNEL_GENERIC_READLINK_GLOBAL
	ZFS_AC_KERNEL_DISCARD_GRANULARITY
	ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE
	ZFS_AC_KERNEL_XATTR
	ZFS_AC_KERNEL_ACL
	ZFS_AC_KERNEL_INODE_GETATTR
	ZFS_AC_KERNEL_INODE_SET_FLAGS
	ZFS_AC_KERNEL_INODE_SET_IVERSION
	ZFS_AC_KERNEL_SHOW_OPTIONS
	ZFS_AC_KERNEL_FILE_INODE
	ZFS_AC_KERNEL_FILE_DENTRY
	ZFS_AC_KERNEL_FSYNC
	ZFS_AC_KERNEL_AIO_FSYNC
	ZFS_AC_KERNEL_EVICT_INODE
	ZFS_AC_KERNEL_DIRTY_INODE
	ZFS_AC_KERNEL_SHRINKER
	ZFS_AC_KERNEL_MKDIR
	ZFS_AC_KERNEL_LOOKUP_FLAGS
	ZFS_AC_KERNEL_CREATE
	ZFS_AC_KERNEL_GET_LINK
	ZFS_AC_KERNEL_PUT_LINK
	ZFS_AC_KERNEL_TMPFILE
	ZFS_AC_KERNEL_AUTOMOUNT
	ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
	ZFS_AC_KERNEL_COMMIT_METADATA
	ZFS_AC_KERNEL_CLEAR_INODE
	ZFS_AC_KERNEL_SETATTR_PREPARE
	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
	ZFS_AC_KERNEL_DENTRY
	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
	ZFS_AC_KERNEL_SECURITY_INODE
	ZFS_AC_KERNEL_FST_MOUNT
	ZFS_AC_KERNEL_BDI
	ZFS_AC_KERNEL_SET_NLINK
	ZFS_AC_KERNEL_SGET
	ZFS_AC_KERNEL_LSEEK_EXECUTE
	ZFS_AC_KERNEL_VFS_GETATTR
	ZFS_AC_KERNEL_VFS_FSYNC_2ARGS
	ZFS_AC_KERNEL_VFS_ITERATE
	ZFS_AC_KERNEL_VFS_DIRECT_IO
	ZFS_AC_KERNEL_VFS_RW_ITERATE
	ZFS_AC_KERNEL_VFS_GENERIC_WRITE_CHECKS
	ZFS_AC_KERNEL_VFS_IOV_ITER
	ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
	ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
	ZFS_AC_KERNEL_MAKE_REQUEST_FN
	ZFS_AC_KERNEL_GENERIC_IO_ACCT
	ZFS_AC_KERNEL_FPU
	ZFS_AC_KERNEL_FMODE_T
	ZFS_AC_KERNEL_KUIDGID_T
	ZFS_AC_KERNEL_KUID_HELPERS
	ZFS_AC_KERNEL_MODULE_PARAM_CALL_CONST
	ZFS_AC_KERNEL_RENAME
	ZFS_AC_KERNEL_CURRENT_TIME
	ZFS_AC_KERNEL_USERNS_CAPABILITIES
	ZFS_AC_KERNEL_IN_COMPAT_SYSCALL
	ZFS_AC_KERNEL_KTIME
	ZFS_AC_KERNEL_TOTALRAM_PAGES_FUNC
	ZFS_AC_KERNEL_TOTALHIGH_PAGES
	ZFS_AC_KERNEL_KSTRTOUL
	ZFS_AC_KERNEL_PERCPU
	ZFS_AC_KERNEL_CPU_HOTPLUG
	ZFS_AC_KERNEL_GENERIC_FILLATTR_USERNS
	ZFS_AC_KERNEL_MKNOD
	ZFS_AC_KERNEL_SYMLINK
	ZFS_AC_KERNEL_BIO_MAX_SEGS
	ZFS_AC_KERNEL_SIGNAL_STOP
	ZFS_AC_KERNEL_SIGINFO
	ZFS_AC_KERNEL_SET_SPECIAL_STATE
	+ ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS
	+ ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG
	])

	dnl #
	dnl # Detect name used for Module.symvers file in kernel
	dnl #
	AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	modpost=$LINUX/scripts/Makefile.modpost
	AC_MSG_CHECKING([kernel file name for module symbols])
	AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
	AS_IF([grep -q Modules.symvers $modpost], [
	LINUX_SYMBOLS=Modules.symvers
	], [
	LINUX_SYMBOLS=Module.symvers
	])

	AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
	AC_MSG_ERROR([
	*** Please make sure the kernel devel package for your distribution
	*** is installed. If you are building with a custom kernel, make sure
	*** the kernel is configured, built, and the '--with-linux=PATH'
	*** configure option refers to the location of the kernel source.
	])
	])
	], [
	LINUX_SYMBOLS=NONE
	])
	AC_MSG_RESULT($LINUX_SYMBOLS)
	AC_SUBST(LINUX_SYMBOLS)
	])

	dnl #
	dnl # Detect the kernel to be built against
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL], [
	AC_ARG_WITH([linux],
	AS_HELP_STRING([--with-linux=PATH],
	[Path to kernel source]),
	[kernelsrc="$withval"])

	AC_ARG_WITH(linux-obj,
	AS_HELP_STRING([--with-linux-obj=PATH],
	[Path to kernel build objects]),
	[kernelbuild="$withval"])

	AC_MSG_CHECKING([kernel source directory])
	AS_IF([test -z "$kernelsrc"], [
	AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
	headersdir="/lib/modules/$(uname -r)/source"
	sourcelink=$(readlink -f "$headersdir")
	], [test -e "/lib/modules/$(uname -r)/build"], [
	headersdir="/lib/modules/$(uname -r)/build"
	sourcelink=$(readlink -f "$headersdir")
	], [
	sourcelink=$(ls -1d /usr/src/kernels/* \
	/usr/src/linux-* \
	2>/dev/null \| grep -v obj \| tail -1)
	])

	AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
	kernelsrc=`readlink -f ${sourcelink}`
	], [
	kernelsrc="[Not found]"
	])
	], [
	AS_IF([test "$kernelsrc" = "NONE"], [
	kernsrcver=NONE
	])
	withlinux=yes
	])

	AC_MSG_RESULT([$kernelsrc])
	AS_IF([test ! -d "$kernelsrc"], [
	AC_MSG_ERROR([
	*** Please make sure the kernel devel package for your distribution
	*** is installed and then try again. If that fails, you can specify the
	*** location of the kernel source with the '--with-linux=PATH' option.])
	])

	AC_MSG_CHECKING([kernel build directory])
	AS_IF([test -z "$kernelbuild"], [
	AS_IF([test x$withlinux != xyes -a -e "/lib/modules/$(uname -r)/build"], [
	kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
	], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
	kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
	], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
	kernelbuild=${kernelsrc}-obj/${target_cpu}/default
	], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
	kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
	], [
	kernelbuild=${kernelsrc}
	])
	])
	AC_MSG_RESULT([$kernelbuild])

	AC_MSG_CHECKING([kernel source version])
	utsrelease1=$kernelbuild/include/linux/version.h
	utsrelease2=$kernelbuild/include/linux/utsrelease.h
	utsrelease3=$kernelbuild/include/generated/utsrelease.h
	AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
	utsrelease=$utsrelease1
	], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
	utsrelease=$utsrelease2
	], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
	utsrelease=$utsrelease3
	])

	AS_IF([test -n "$utsrelease"], [
	kernsrcver=$($AWK '/UTS_RELEASE/ { gsub(/"/, "", $[3]); print $[3] }' $utsrelease)
	AS_IF([test -z "$kernsrcver"], [
	AC_MSG_RESULT([Not found])
	AC_MSG_ERROR([
	*** Cannot determine kernel version.
	])
	])
	], [
	AC_MSG_RESULT([Not found])
	if test "x$enable_linux_builtin" != xyes; then
	AC_MSG_ERROR([
	*** Cannot find UTS_RELEASE definition.
	])
	else
	AC_MSG_ERROR([
	*** Cannot find UTS_RELEASE definition.
	*** Please run 'make prepare' inside the kernel source tree.])
	fi
	])

	AC_MSG_RESULT([$kernsrcver])

	AS_VERSION_COMPARE([$kernsrcver], [$ZFS_META_KVER_MIN], [
	AC_MSG_ERROR([
	*** Cannot build against kernel version $kernsrcver.
	*** The minimum supported kernel version is $ZFS_META_KVER_MIN.
	])
	])

	LINUX=${kernelsrc}
	LINUX_OBJ=${kernelbuild}
	LINUX_VERSION=${kernsrcver}

	AC_SUBST(LINUX)
	AC_SUBST(LINUX_OBJ)
	AC_SUBST(LINUX_VERSION)

	ZFS_AC_MODULE_SYMVERS
	])

	dnl #
	dnl # Detect the QAT module to be built against, QAT provides hardware
	dnl # acceleration for data compression:
	dnl #
	dnl # https://01.org/intel-quickassist-technology
	dnl #
	dnl # 1) Download and install QAT driver from the above link
	dnl # 2) Start QAT driver in your system:
	dnl # service qat_service start
	dnl # 3) Enable QAT in ZFS, e.g.:
	dnl # ./configure --with-qat=<qat-driver-path>/QAT1.6
	dnl # make
	dnl # 4) Set GZIP compression in ZFS dataset:
	dnl # zfs set compression = gzip <dataset>
	dnl #
	dnl # Then the data written to this ZFS pool is compressed by QAT accelerator
	dnl # automatically, and de-compressed by QAT when read from the pool.
	dnl #
	dnl # 1) Get QAT hardware statistics with:
	dnl # cat /proc/icp_dh895xcc_dev/qat
	dnl # 2) To disable QAT:
	dnl # insmod zfs.ko zfs_qat_disable=1
	dnl #
	AC_DEFUN([ZFS_AC_QAT], [
	AC_ARG_WITH([qat],
	AS_HELP_STRING([--with-qat=PATH],
	[Path to qat source]),
	AS_IF([test "$withval" = "yes"],
	AC_MSG_ERROR([--with-qat=PATH requires a PATH]),
	[qatsrc="$withval"]))

	AC_ARG_WITH([qat-obj],
	AS_HELP_STRING([--with-qat-obj=PATH],
	[Path to qat build objects]),
	[qatbuild="$withval"])

	AS_IF([test ! -z "${qatsrc}"], [
	AC_MSG_CHECKING([qat source directory])
	AC_MSG_RESULT([$qatsrc])
	QAT_SRC="${qatsrc}/quickassist"
	AS_IF([ test ! -e "$QAT_SRC/include/cpa.h"], [
	AC_MSG_ERROR([
	*** Please make sure the qat driver package is installed
	*** and specify the location of the qat source with the
	*** '--with-qat=PATH' option then try again. Failed to
	*** find cpa.h in:
	${QAT_SRC}/include])
	])
	])

	AS_IF([test ! -z "${qatsrc}"], [
	AC_MSG_CHECKING([qat build directory])
	AS_IF([test -z "$qatbuild"], [
	qatbuild="${qatsrc}/build"
	])

	AC_MSG_RESULT([$qatbuild])
	QAT_OBJ=${qatbuild}
	AS_IF([ ! test -e "$QAT_OBJ/icp_qa_al.ko" && ! test -e "$QAT_OBJ/qat_api.ko"], [
	AC_MSG_ERROR([
	*** Please make sure the qat driver is installed then try again.
	*** Failed to find icp_qa_al.ko or qat_api.ko in:
	$QAT_OBJ])
	])

	AC_SUBST(QAT_SRC)
	AC_SUBST(QAT_OBJ)

	AC_DEFINE(HAVE_QAT, 1,
	[qat is enabled and existed])
	])

	dnl #
	dnl # Detect the name used for the QAT Module.symvers file.
	dnl #
	AS_IF([test ! -z "${qatsrc}"], [
	AC_MSG_CHECKING([qat file for module symbols])
	QAT_SYMBOLS=$QAT_SRC/lookaside/access_layer/src/Module.symvers

	AS_IF([test -r $QAT_SYMBOLS], [
	AC_MSG_RESULT([$QAT_SYMBOLS])
	AC_SUBST(QAT_SYMBOLS)
	],[
	AC_MSG_ERROR([
	*** Please make sure the qat driver is installed then try again.
	*** Failed to find Module.symvers in:
	$QAT_SYMBOLS
	])
	])
	])
	])

	dnl #
	dnl # Basic toolchain sanity check.
	dnl #
	AC_DEFUN([ZFS_AC_KERNEL_TEST_MODULE], [
	AC_MSG_CHECKING([whether modules can be built])
	ZFS_LINUX_TRY_COMPILE([], [], [
	AC_MSG_RESULT([yes])
	],[
	AC_MSG_RESULT([no])
	if test "x$enable_linux_builtin" != xyes; then
	AC_MSG_ERROR([
	*** Unable to build an empty module.
	])
	else
	AC_MSG_ERROR([
	*** Unable to build an empty module.
	*** Please run 'make scripts' inside the kernel source tree.])
	fi
	])
	])

	dnl #
	dnl # ZFS_LINUX_CONFTEST_H
	dnl #
	AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
	test -d build/$2 \|\| mkdir -p build/$2
	cat - <<_ACEOF >build/$2/$2.h
	$1
	_ACEOF
	])

	dnl #
	dnl # ZFS_LINUX_CONFTEST_C
	dnl #
	AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
	test -d build/$2 \|\| mkdir -p build/$2
	cat confdefs.h - <<_ACEOF >build/$2/$2.c
	$1
	_ACEOF
	])

	dnl #
	dnl # ZFS_LINUX_CONFTEST_MAKEFILE
	dnl #
	dnl # $1 - test case name
	dnl # $2 - add to top-level Makefile
	dnl # $3 - additional build flags
	dnl #
	AC_DEFUN([ZFS_LINUX_CONFTEST_MAKEFILE], [
	test -d build \|\| mkdir -p build
	test -d build/$1 \|\| mkdir -p build/$1

	file=build/$1/Makefile

	dnl # Example command line to manually build source.
	cat - <<_ACEOF >$file
	# Example command line to manually build source
	# make modules -C $LINUX_OBJ $ARCH_UM M=$PWD/build/$1

	ccflags-y := -Werror $FRAME_LARGER_THAN
	_ACEOF

	dnl # Additional custom CFLAGS as requested.
	m4_ifval($3, [echo "ccflags-y += $3" >>$file], [])

	dnl # Test case source
	echo "obj-m := $1.o" >>$file

	AS_IF([test "x$2" = "xyes"], [echo "obj-m += $1/" >>build/Makefile], [])
	])

	dnl #
	dnl # ZFS_LINUX_TEST_PROGRAM(C)([PROLOGUE], [BODY])
	dnl #
	m4_define([ZFS_LINUX_TEST_PROGRAM], [
	#include <linux/module.h>
	$1

	int
	main (void)
	{
	$2
	;
	return 0;
	}

	MODULE_DESCRIPTION("conftest");
	MODULE_AUTHOR(ZFS_META_AUTHOR);
	MODULE_VERSION(ZFS_META_VERSION "-" ZFS_META_RELEASE);
	MODULE_LICENSE($3);
	])

	dnl #
	dnl # ZFS_LINUX_TEST_REMOVE
	dnl #
	dnl # Removes the specified test source and results.
	dnl #
	AC_DEFUN([ZFS_LINUX_TEST_REMOVE], [
	test -d build/$1 && rm -Rf build/$1
	test -f build/Makefile && sed '/$1/d' build/Makefile
	])

	dnl #
	dnl # ZFS_LINUX_COMPILE
	dnl #
	dnl # $1 - build dir
	dnl # $2 - test command
	dnl # $3 - pass command
	dnl # $4 - fail command
	dnl # $5 - set KBUILD_MODPOST_NOFINAL='yes'
	dnl # $6 - set KBUILD_MODPOST_WARN='yes'
	dnl #
	dnl # Used internally by ZFS_LINUX_TEST_{COMPILE,MODPOST}
	dnl #
	AC_DEFUN([ZFS_LINUX_COMPILE], [
	AC_TRY_COMMAND([
	KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
	make modules -k -j$TEST_JOBS -C $LINUX_OBJ $ARCH_UM
	M=$PWD/$1 >$1/build.log 2>&1])
	AS_IF([AC_TRY_COMMAND([$2])], [$3], [$4])
	])

	dnl #
	dnl # ZFS_LINUX_TEST_COMPILE
	dnl #
	dnl # Perform a full compile excluding the final modpost phase.
	dnl #
	AC_DEFUN([ZFS_LINUX_TEST_COMPILE], [
	ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
	mv $2/Makefile $2/Makefile.compile.$1
	mv $2/build.log $2/build.log.$1
	],[
	AC_MSG_ERROR([
	*** Unable to compile test source to determine kernel interfaces.])
	], [yes], [])
	])

	dnl #
	dnl # ZFS_LINUX_TEST_MODPOST
	dnl #
	dnl # Perform a full compile including the modpost phase. This may
	dnl # be an incremental build if the objects have already been built.
	dnl #
	AC_DEFUN([ZFS_LINUX_TEST_MODPOST], [
	ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
	mv $2/Makefile $2/Makefile.modpost.$1
	cat $2/build.log >>build/build.log.$1
	],[
	AC_MSG_ERROR([
	*** Unable to modpost test source to determine kernel interfaces.])
	], [], [yes])
	])

	dnl #
	dnl # Perform the compilation of the test cases in two phases.
	dnl #
	dnl # Phase 1) attempt to build the object files for all of the tests
	dnl # defined by the ZFS_LINUX_TEST_SRC macro. But do not
	dnl # perform the final modpost stage.
	dnl #
	dnl # Phase 2) disable all tests which failed the initial compilation,
	dnl # then invoke the final modpost step for the remaining tests.
	dnl #
	dnl # This allows us efficiently build the test cases in parallel while
	dnl # remaining resilient to build failures which are expected when
	dnl # detecting the available kernel interfaces.
	dnl #
	dnl # The maximum allowed parallelism can be controlled by setting the
	dnl # TEST_JOBS environment variable. Otherwise, it default to $(nproc).
	dnl #
	AC_DEFUN([ZFS_LINUX_TEST_COMPILE_ALL], [
	dnl # Phase 1 - Compilation only, final linking is skipped.
	ZFS_LINUX_TEST_COMPILE([$1], [build])

	dnl #
	dnl # Phase 2 - When building external modules disable test cases
	dnl # which failed to compile and invoke modpost to verify the
	dnl # final linking.
	dnl #
	dnl # Test names suffixed with '_license' call modpost independently
	dnl # to ensure that a single incompatibility does not result in the
	dnl # modpost phase exiting early. This check is not performed on
	dnl # every symbol since the majority are compatible and doing so
	dnl # would significantly slow down this phase.
	dnl #
	dnl # When configuring for builtin (--enable-linux-builtin)
	dnl # fake the linking step artificially create the expected .ko
	dnl # files for tests which did compile. This is required for
	dnl # kernels which do not have loadable module support or have
	dnl # not yet been built.
	dnl #
	AS_IF([test "x$enable_linux_builtin" = "xno"], [
	for dir in $(awk '/^obj-m/ { print [$]3 }' \
	build/Makefile.compile.$1); do
	name=${dir%/}
	AS_IF([test -f build/$name/$name.o], [
	AS_IF([test "${name##*_}" = "license"], [
	ZFS_LINUX_TEST_MODPOST([$1],
	[build/$name])
	echo "obj-n += $dir" >>build/Makefile
	], [
	echo "obj-m += $dir" >>build/Makefile
	])
	], [
	echo "obj-n += $dir" >>build/Makefile
	])
	done

	ZFS_LINUX_TEST_MODPOST([$1], [build])
	], [
	for dir in $(awk '/^obj-m/ { print [$]3 }' \
	build/Makefile.compile.$1); do
	name=${dir%/}
	AS_IF([test -f build/$name/$name.o], [
	touch build/$name/$name.ko
	])
	done
	])
	])

	dnl #
	dnl # ZFS_LINUX_TEST_SRC
	dnl #
	dnl # $1 - name
	dnl # $2 - global
	dnl # $3 - source
	dnl # $4 - extra cflags
	dnl # $5 - check license-compatibility
	dnl #
	dnl # Check if the test source is buildable at all and then if it is
	dnl # license compatible.
	dnl #
	dnl # N.B because all of the test cases are compiled in parallel they
	dnl # must never depend on the results of previous tests. Each test
	dnl # needs to be entirely independent.
	dnl #
	AC_DEFUN([ZFS_LINUX_TEST_SRC], [
	ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM([[$2]], [[$3]],
	[["Dual BSD/GPL"]])], [$1])
	ZFS_LINUX_CONFTEST_MAKEFILE([$1], [yes], [$4])

	AS_IF([ test -n "$5" ], [
	ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM(
	[[$2]], [[$3]], [[$5]])], [$1_license])
	ZFS_LINUX_CONFTEST_MAKEFILE([$1_license], [yes], [$4])
	])
	])

	dnl #
	dnl # ZFS_LINUX_TEST_RESULT
	dnl #
	dnl # $1 - name of a test source (ZFS_LINUX_TEST_SRC)
	dnl # $2 - run on success (valid .ko generated)
	dnl # $3 - run on failure (unable to compile)
	dnl #
	AC_DEFUN([ZFS_LINUX_TEST_RESULT], [
	AS_IF([test -d build/$1], [
	AS_IF([test -f build/$1/$1.ko], [$2], [$3])
	], [
	AC_MSG_ERROR([
	*** No matching source for the "$1" test, check that
	*** both the test source and result macros refer to the same name.
	])
	])
	])

	dnl #
	dnl # ZFS_LINUX_TEST_ERROR
	dnl #
	dnl # Generic error message which can be used when none of the expected
	dnl # kernel interfaces were detected.
	dnl #
	AC_DEFUN([ZFS_LINUX_TEST_ERROR], [
	AC_MSG_ERROR([
	*** None of the expected "$1" interfaces were detected.
	*** This may be because your kernel version is newer than what is
	*** supported, or you are using a patched custom kernel with
	*** incompatible modifications.
	***
	*** ZFS Version: $ZFS_META_ALIAS
	*** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
	])
	])

	dnl #
	dnl # ZFS_LINUX_TEST_RESULT_SYMBOL
	dnl #
	dnl # Like ZFS_LINUX_TEST_RESULT except ZFS_CHECK_SYMBOL_EXPORT is called to
	dnl # verify symbol exports, unless --enable-linux-builtin was provided to
	dnl # configure.
	dnl #
	AC_DEFUN([ZFS_LINUX_TEST_RESULT_SYMBOL], [
	AS_IF([ ! test -f build/$1/$1.ko], [
	$5
	], [
	AS_IF([test "x$enable_linux_builtin" != "xyes"], [
	ZFS_CHECK_SYMBOL_EXPORT([$2], [$3], [$4], [$5])
	], [
	$4
	])
	])
	])

	dnl #
	dnl # ZFS_LINUX_COMPILE_IFELSE
	dnl #
	AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	ZFS_LINUX_TEST_REMOVE([conftest])

	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST_C([$1], [conftest])])
	m4_ifvaln([$5], [ZFS_LINUX_CONFTEST_H([$5], [conftest])],
	[ZFS_LINUX_CONFTEST_H([], [conftest])])

	ZFS_LINUX_CONFTEST_MAKEFILE([conftest], [no],
	[m4_ifvaln([$5], [-I$PWD/build/conftest], [])])
	ZFS_LINUX_COMPILE([build/conftest], [$2], [$3], [$4], [], [])
	])

	dnl #
	dnl # ZFS_LINUX_TRY_COMPILE
	dnl #
	dnl # $1 - global
	dnl # $2 - source
	dnl # $3 - run on success (valid .ko generated)
	dnl # $4 - run on failure (unable to compile)
	dnl #
	dnl # When configuring as builtin (--enable-linux-builtin) for kernels
	dnl # without loadable module support (CONFIG_MODULES=n) only the object
	dnl # file is created. See ZFS_LINUX_TEST_COMPILE_ALL for details.
	dnl #
	AC_DEFUN([ZFS_LINUX_TRY_COMPILE], [
	AS_IF([test "x$enable_linux_builtin" = "xyes"], [
	ZFS_LINUX_COMPILE_IFELSE(
	[ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
	[[ZFS_META_LICENSE]])],
	[test -f build/conftest/conftest.o], [$3], [$4])
	], [
	ZFS_LINUX_COMPILE_IFELSE(
	[ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
	[[ZFS_META_LICENSE]])],
	[test -f build/conftest/conftest.ko], [$3], [$4])
	])
	])

	dnl #
	dnl # ZFS_CHECK_SYMBOL_EXPORT
	dnl #
	dnl # Check if a symbol is exported on not by consulting the symbols
	dnl # file, or optionally the source code.
	dnl #
	AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
	$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
	rc=$?
	if test $rc -ne 0; then
	export=0
	for file in $2; do
	grep -q -E "EXPORT_SYMBOL.*($1)" \
	"$LINUX/$file" 2>/dev/null
	rc=$?
	if test $rc -eq 0; then
	export=1
	break;
	fi
	done
	if test $export -eq 0; then :
	$4
	else :
	$3
	fi
	else :
	$3
	fi
	])

	dnl #
	dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
	dnl #
	dnl # Like ZFS_LINUX_TRY_COMPILER except ZFS_CHECK_SYMBOL_EXPORT is called
	dnl # to verify symbol exports, unless --enable-linux-builtin was provided
	dnl # to configure.
	dnl #
	AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
	ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
	if test $rc -ne 0; then :
	$6
	else
	if test "x$enable_linux_builtin" != xyes; then
	ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
	fi
	if test $rc -ne 0; then :
	$6
	else :
	$5
	fi
	fi
	])

	dnl #
	dnl # ZFS_LINUX_TRY_COMPILE_HEADER
	dnl # like ZFS_LINUX_TRY_COMPILE, except the contents conftest.h are
	dnl # provided via the fifth parameter
	dnl #
	AC_DEFUN([ZFS_LINUX_TRY_COMPILE_HEADER], [
	ZFS_LINUX_COMPILE_IFELSE(
	[ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]], [[ZFS_META_LICENSE]])],
	[test -f build/conftest/conftest.ko],
	[$3], [$4], [$5])
	])
	diff --git a/sys/contrib/openzfs/config/user-libatomic.m4 b/sys/contrib/openzfs/config/user-libatomic.m4
	index 14a60bbea9d0..d15069f9c445 100644
	--- a/sys/contrib/openzfs/config/user-libatomic.m4
	+++ b/sys/contrib/openzfs/config/user-libatomic.m4
	@@ -1,34 +1,28 @@
	dnl #
	-dnl # If -latomic exists, it's needed for __atomic intrinsics.
	-dnl #
	-dnl # Some systems (like FreeBSD 13) don't have a libatomic at all because
	-dnl # their toolchain doesn't ship it – they obviously don't need it.
	-dnl #
	-dnl # Others (like sufficiently ancient CentOS) have one,
	-dnl # but terminally broken or unlinkable (e.g. it's a dangling symlink,
	-dnl # or a linker script that points to a nonexistent file) –
	-dnl # most arches affected by this don't actually need -latomic (and if they do,
	-dnl # then they should have libatomic that actually exists and links,
	-dnl # so don't fall into this category).
	-dnl #
	-dnl # Technically, we could check if the platform actually needs -latomic,
	-dnl # or if it has native support for all the intrinsics we use,
	-dnl # but it /really/ doesn't matter, and C11 recommends to always link it.
	+dnl # If -latomic exists and atomic.c doesn't link without it,
	+dnl # it's needed for __atomic intrinsics.
	dnl #
	AC_DEFUN([ZFS_AC_CONFIG_USER_LIBATOMIC], [
	- AC_MSG_CHECKING([whether -latomic is present])
	+ AC_MSG_CHECKING([whether -latomic is required])

	saved_libs="$LIBS"
	LIBS="$LIBS -latomic"
	+ LIBATOMIC_LIBS=""

	AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
	- LIBATOMIC_LIBS="-latomic"
	+ LIBS="$saved_libs"
	+ saved_cflags="$CFLAGS"
	+ CFLAGS="$CFLAGS -isystem lib/libspl/include"
	+ AC_LINK_IFELSE([AC_LANG_PROGRAM([#include "lib/libspl/atomic.c"], [])], [], [LIBATOMIC_LIBS="-latomic"])
	+ CFLAGS="$saved_cflags"
	+ ])
	+
	+ if test -n "$LIBATOMIC_LIBS"; then
	AC_MSG_RESULT([yes])
	- ], [
	- LIBATOMIC_LIBS=""
	+ else
	AC_MSG_RESULT([no])
	- ])
	+ fi

	LIBS="$saved_libs"
	AC_SUBST([LIBATOMIC_LIBS])
	])
	diff --git a/sys/contrib/openzfs/configure.ac b/sys/contrib/openzfs/configure.ac
	index 27409c82f396..6f34b210d2b7 100644
	--- a/sys/contrib/openzfs/configure.ac
	+++ b/sys/contrib/openzfs/configure.ac
	@@ -1,416 +1,417 @@
	/*
	* This file is part of the ZFS Linux port.
	*
	* Copyright (c) 2009 Lawrence Livermore National Security, LLC.
	* Produced at Lawrence Livermore National Laboratory
	* Written by:
	* Brian Behlendorf <behlendorf1@llnl.gov>,
	* Herb Wartens <wartens2@llnl.gov>,
	* Jim Garlick <garlick@llnl.gov>
	* LLNL-CODE-403049
	*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License, Version 1.0 only
	* (the "License"). You may not use this file except in compliance
	* with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	AC_INIT(m4_esyscmd(grep ^Name: META \| cut -d ':' -f 2 \| tr -d ' \n'),
	m4_esyscmd(grep ^Version: META \| cut -d ':' -f 2 \| tr -d ' \n'))
	AC_LANG(C)
	ZFS_AC_META
	AC_CONFIG_AUX_DIR([config])
	AC_CONFIG_MACRO_DIR([config])
	AC_CANONICAL_TARGET
	AM_MAINTAINER_MODE
	m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
	AM_INIT_AUTOMAKE([subdir-objects])
	AC_CONFIG_HEADERS([zfs_config.h], [
	(mv zfs_config.h zfs_config.h.tmp &&
	awk -f ${ac_srcdir}/config/config.awk zfs_config.h.tmp >zfs_config.h &&
	rm zfs_config.h.tmp) \|\| exit 1])

	LT_INIT
	AC_PROG_INSTALL
	AC_PROG_CC
	AC_PROG_LN_S
	PKG_PROG_PKG_CONFIG
	AM_PROG_AS
	AM_PROG_CC_C_O
	AX_CODE_COVERAGE
	_AM_PROG_TAR(pax)

	ZFS_AC_LICENSE
	ZFS_AC_CONFIG
	ZFS_AC_PACKAGE
	ZFS_AC_DEBUG
	ZFS_AC_DEBUGINFO
	ZFS_AC_DEBUG_KMEM
	ZFS_AC_DEBUG_KMEM_TRACKING
	ZFS_AC_DEBUG_INVARIANTS

	AC_CONFIG_FILES([
	Makefile
	cmd/Makefile
	cmd/arc_summary/Makefile
	cmd/arcstat/Makefile
	cmd/dbufstat/Makefile
	cmd/fsck_zfs/Makefile
	cmd/mount_zfs/Makefile
	cmd/raidz_test/Makefile
	cmd/vdev_id/Makefile
	cmd/zdb/Makefile
	cmd/zed/Makefile
	cmd/zed/zed.d/Makefile
	cmd/zfs/Makefile
	cmd/zfs_ids_to_path/Makefile
	cmd/zgenhostid/Makefile
	cmd/zhack/Makefile
	cmd/zinject/Makefile
	cmd/zpool/Makefile
	cmd/zstream/Makefile
	cmd/ztest/Makefile
	cmd/zvol_id/Makefile
	cmd/zvol_wait/Makefile
	cmd/zpool_influxdb/Makefile
	contrib/Makefile
	contrib/bash_completion.d/Makefile
	contrib/bpftrace/Makefile
	contrib/dracut/02zfsexpandknowledge/Makefile
	contrib/dracut/90zfs/Makefile
	contrib/dracut/Makefile
	contrib/initramfs/Makefile
	contrib/initramfs/conf.d/Makefile
	contrib/initramfs/conf-hooks.d/Makefile
	contrib/initramfs/hooks/Makefile
	contrib/initramfs/scripts/Makefile
	contrib/initramfs/scripts/local-top/Makefile
	contrib/pam_zfs_key/Makefile
	contrib/pyzfs/Makefile
	contrib/pyzfs/setup.py
	contrib/zcp/Makefile
	etc/Makefile
	etc/default/Makefile
	etc/init.d/Makefile
	etc/modules-load.d/Makefile
	etc/sudoers.d/Makefile
	etc/systemd/Makefile
	etc/systemd/system-generators/Makefile
	etc/systemd/system/Makefile
	etc/zfs/Makefile
	include/Makefile
	include/os/Makefile
	include/os/freebsd/Makefile
	include/os/freebsd/linux/Makefile
	include/os/freebsd/spl/Makefile
	include/os/freebsd/spl/acl/Makefile
	include/os/freebsd/spl/rpc/Makefile
	include/os/freebsd/spl/sys/Makefile
	include/os/freebsd/zfs/Makefile
	include/os/freebsd/zfs/sys/Makefile
	include/os/linux/Makefile
	include/os/linux/kernel/Makefile
	include/os/linux/kernel/linux/Makefile
	include/os/linux/spl/Makefile
	include/os/linux/spl/rpc/Makefile
	include/os/linux/spl/sys/Makefile
	include/os/linux/zfs/Makefile
	include/os/linux/zfs/sys/Makefile
	include/sys/Makefile
	include/sys/crypto/Makefile
	include/sys/fm/Makefile
	include/sys/fm/fs/Makefile
	include/sys/fs/Makefile
	include/sys/lua/Makefile
	include/sys/sysevent/Makefile
	include/sys/zstd/Makefile
	lib/Makefile
	lib/libavl/Makefile
	lib/libefi/Makefile
	lib/libicp/Makefile
	lib/libnvpair/Makefile
	lib/libshare/Makefile
	lib/libspl/Makefile
	lib/libspl/include/Makefile
	lib/libspl/include/ia32/Makefile
	lib/libspl/include/ia32/sys/Makefile
	lib/libspl/include/os/Makefile
	lib/libspl/include/os/freebsd/Makefile
	lib/libspl/include/os/freebsd/sys/Makefile
	lib/libspl/include/os/linux/Makefile
	lib/libspl/include/os/linux/sys/Makefile
	lib/libspl/include/rpc/Makefile
	lib/libspl/include/sys/Makefile
	lib/libspl/include/sys/dktp/Makefile
	lib/libspl/include/util/Makefile
	lib/libtpool/Makefile
	lib/libunicode/Makefile
	lib/libuutil/Makefile
	lib/libzfs/Makefile
	lib/libzfs/libzfs.pc
	lib/libzfsbootenv/Makefile
	lib/libzfsbootenv/libzfsbootenv.pc
	lib/libzfs_core/Makefile
	lib/libzfs_core/libzfs_core.pc
	lib/libzpool/Makefile
	lib/libzstd/Makefile
	lib/libzutil/Makefile
	man/Makefile
	module/Kbuild
	module/Makefile
	module/avl/Makefile
	module/icp/Makefile
	module/lua/Makefile
	module/nvpair/Makefile
	module/os/linux/spl/Makefile
	module/os/linux/zfs/Makefile
	module/spl/Makefile
	module/unicode/Makefile
	module/zcommon/Makefile
	module/zfs/Makefile
	module/zstd/Makefile
	rpm/Makefile
	rpm/generic/Makefile
	rpm/generic/zfs-dkms.spec
	rpm/generic/zfs-kmod.spec
	rpm/generic/zfs.spec
	rpm/redhat/Makefile
	rpm/redhat/zfs-dkms.spec
	rpm/redhat/zfs-kmod.spec
	rpm/redhat/zfs.spec
	scripts/Makefile
	tests/Makefile
	tests/runfiles/Makefile
	tests/test-runner/Makefile
	tests/test-runner/bin/Makefile
	tests/test-runner/include/Makefile
	tests/test-runner/man/Makefile
	tests/zfs-tests/Makefile
	tests/zfs-tests/callbacks/Makefile
	tests/zfs-tests/cmd/Makefile
	tests/zfs-tests/cmd/badsend/Makefile
	tests/zfs-tests/cmd/btree_test/Makefile
	tests/zfs-tests/cmd/chg_usr_exec/Makefile
	tests/zfs-tests/cmd/devname2devid/Makefile
	tests/zfs-tests/cmd/draid/Makefile
	tests/zfs-tests/cmd/dir_rd_update/Makefile
	tests/zfs-tests/cmd/file_check/Makefile
	tests/zfs-tests/cmd/file_trunc/Makefile
	tests/zfs-tests/cmd/file_write/Makefile
	tests/zfs-tests/cmd/get_diff/Makefile
	tests/zfs-tests/cmd/largest_file/Makefile
	tests/zfs-tests/cmd/libzfs_input_check/Makefile
	tests/zfs-tests/cmd/mkbusy/Makefile
	tests/zfs-tests/cmd/mkfile/Makefile
	tests/zfs-tests/cmd/mkfiles/Makefile
	tests/zfs-tests/cmd/mktree/Makefile
	tests/zfs-tests/cmd/mmap_exec/Makefile
	tests/zfs-tests/cmd/mmap_libaio/Makefile
	tests/zfs-tests/cmd/mmapwrite/Makefile
	tests/zfs-tests/cmd/nvlist_to_lua/Makefile
	tests/zfs-tests/cmd/randfree_file/Makefile
	tests/zfs-tests/cmd/randwritecomp/Makefile
	tests/zfs-tests/cmd/readmmap/Makefile
	tests/zfs-tests/cmd/rename_dir/Makefile
	tests/zfs-tests/cmd/rm_lnkcnt_zero_file/Makefile
	tests/zfs-tests/cmd/send_doall/Makefile
	tests/zfs-tests/cmd/stride_dd/Makefile
	tests/zfs-tests/cmd/threadsappend/Makefile
	tests/zfs-tests/cmd/user_ns_exec/Makefile
	tests/zfs-tests/cmd/xattrtest/Makefile
	tests/zfs-tests/include/Makefile
	tests/zfs-tests/tests/Makefile
	tests/zfs-tests/tests/functional/Makefile
	tests/zfs-tests/tests/functional/acl/Makefile
	tests/zfs-tests/tests/functional/acl/off/Makefile
	tests/zfs-tests/tests/functional/acl/posix/Makefile
	tests/zfs-tests/tests/functional/acl/posix-sa/Makefile
	tests/zfs-tests/tests/functional/alloc_class/Makefile
	tests/zfs-tests/tests/functional/arc/Makefile
	tests/zfs-tests/tests/functional/atime/Makefile
	tests/zfs-tests/tests/functional/bootfs/Makefile
	tests/zfs-tests/tests/functional/btree/Makefile
	tests/zfs-tests/tests/functional/cache/Makefile
	tests/zfs-tests/tests/functional/cachefile/Makefile
	tests/zfs-tests/tests/functional/casenorm/Makefile
	tests/zfs-tests/tests/functional/channel_program/Makefile
	tests/zfs-tests/tests/functional/channel_program/lua_core/Makefile
	tests/zfs-tests/tests/functional/channel_program/synctask_core/Makefile
	tests/zfs-tests/tests/functional/chattr/Makefile
	tests/zfs-tests/tests/functional/checksum/Makefile
	tests/zfs-tests/tests/functional/clean_mirror/Makefile
	tests/zfs-tests/tests/functional/cli_root/Makefile
	tests/zfs-tests/tests/functional/cli_root/zdb/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_bookmark/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_change-key/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_clone/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_copies/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_create/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_destroy/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_diff/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_get/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_ids_to_path/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_inherit/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_jail/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_load-key/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_mount/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_program/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_promote/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_property/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_receive/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_rename/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_reservation/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_rollback/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_send/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_set/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_share/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_snapshot/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_sysfs/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_unload-key/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_unmount/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_unshare/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_upgrade/Makefile
	tests/zfs-tests/tests/functional/cli_root/zfs_wait/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_add/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_attach/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_clear/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_create/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_destroy/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_detach/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_events/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_expand/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_export/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_get/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_history/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_import/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_import/blockfiles/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_initialize/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_labelclear/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_offline/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_online/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_remove/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_reopen/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_replace/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_resilver/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_scrub/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_set/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_split/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_status/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_sync/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_trim/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_upgrade/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_upgrade/blockfiles/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_wait/Makefile
	tests/zfs-tests/tests/functional/cli_root/zpool_wait/scan/Makefile
	tests/zfs-tests/tests/functional/cli_user/Makefile
	tests/zfs-tests/tests/functional/cli_user/misc/Makefile
	tests/zfs-tests/tests/functional/cli_user/zfs_list/Makefile
	tests/zfs-tests/tests/functional/cli_user/zpool_iostat/Makefile
	tests/zfs-tests/tests/functional/cli_user/zpool_list/Makefile
	tests/zfs-tests/tests/functional/cli_user/zpool_status/Makefile
	tests/zfs-tests/tests/functional/compression/Makefile
	tests/zfs-tests/tests/functional/cp_files/Makefile
	+ tests/zfs-tests/tests/functional/crtime/Makefile
	tests/zfs-tests/tests/functional/ctime/Makefile
	tests/zfs-tests/tests/functional/deadman/Makefile
	tests/zfs-tests/tests/functional/delegate/Makefile
	tests/zfs-tests/tests/functional/devices/Makefile
	tests/zfs-tests/tests/functional/events/Makefile
	tests/zfs-tests/tests/functional/exec/Makefile
	tests/zfs-tests/tests/functional/fallocate/Makefile
	tests/zfs-tests/tests/functional/fault/Makefile
	tests/zfs-tests/tests/functional/features/Makefile
	tests/zfs-tests/tests/functional/features/async_destroy/Makefile
	tests/zfs-tests/tests/functional/features/large_dnode/Makefile
	tests/zfs-tests/tests/functional/grow/Makefile
	tests/zfs-tests/tests/functional/history/Makefile
	tests/zfs-tests/tests/functional/hkdf/Makefile
	tests/zfs-tests/tests/functional/inheritance/Makefile
	tests/zfs-tests/tests/functional/inuse/Makefile
	tests/zfs-tests/tests/functional/io/Makefile
	tests/zfs-tests/tests/functional/l2arc/Makefile
	tests/zfs-tests/tests/functional/large_files/Makefile
	tests/zfs-tests/tests/functional/largest_pool/Makefile
	tests/zfs-tests/tests/functional/libzfs/Makefile
	tests/zfs-tests/tests/functional/limits/Makefile
	tests/zfs-tests/tests/functional/link_count/Makefile
	tests/zfs-tests/tests/functional/log_spacemap/Makefile
	tests/zfs-tests/tests/functional/migration/Makefile
	tests/zfs-tests/tests/functional/mmap/Makefile
	tests/zfs-tests/tests/functional/mmp/Makefile
	tests/zfs-tests/tests/functional/mount/Makefile
	tests/zfs-tests/tests/functional/mv_files/Makefile
	tests/zfs-tests/tests/functional/nestedfs/Makefile
	tests/zfs-tests/tests/functional/no_space/Makefile
	tests/zfs-tests/tests/functional/nopwrite/Makefile
	tests/zfs-tests/tests/functional/online_offline/Makefile
	tests/zfs-tests/tests/functional/pam/Makefile
	tests/zfs-tests/tests/functional/pool_checkpoint/Makefile
	tests/zfs-tests/tests/functional/pool_names/Makefile
	tests/zfs-tests/tests/functional/poolversion/Makefile
	tests/zfs-tests/tests/functional/privilege/Makefile
	tests/zfs-tests/tests/functional/procfs/Makefile
	tests/zfs-tests/tests/functional/projectquota/Makefile
	tests/zfs-tests/tests/functional/pyzfs/Makefile
	tests/zfs-tests/tests/functional/quota/Makefile
	tests/zfs-tests/tests/functional/raidz/Makefile
	tests/zfs-tests/tests/functional/redacted_send/Makefile
	tests/zfs-tests/tests/functional/redundancy/Makefile
	tests/zfs-tests/tests/functional/refquota/Makefile
	tests/zfs-tests/tests/functional/refreserv/Makefile
	tests/zfs-tests/tests/functional/removal/Makefile
	tests/zfs-tests/tests/functional/rename_dirs/Makefile
	tests/zfs-tests/tests/functional/replacement/Makefile
	tests/zfs-tests/tests/functional/reservation/Makefile
	tests/zfs-tests/tests/functional/rootpool/Makefile
	tests/zfs-tests/tests/functional/rsend/Makefile
	tests/zfs-tests/tests/functional/scrub_mirror/Makefile
	tests/zfs-tests/tests/functional/slog/Makefile
	tests/zfs-tests/tests/functional/snapshot/Makefile
	tests/zfs-tests/tests/functional/snapused/Makefile
	tests/zfs-tests/tests/functional/sparse/Makefile
	tests/zfs-tests/tests/functional/suid/Makefile
	tests/zfs-tests/tests/functional/threadsappend/Makefile
	tests/zfs-tests/tests/functional/tmpfile/Makefile
	tests/zfs-tests/tests/functional/trim/Makefile
	tests/zfs-tests/tests/functional/truncate/Makefile
	tests/zfs-tests/tests/functional/upgrade/Makefile
	tests/zfs-tests/tests/functional/user_namespace/Makefile
	tests/zfs-tests/tests/functional/userquota/Makefile
	tests/zfs-tests/tests/functional/vdev_zaps/Makefile
	tests/zfs-tests/tests/functional/write_dirs/Makefile
	tests/zfs-tests/tests/functional/xattr/Makefile
	tests/zfs-tests/tests/functional/zpool_influxdb/Makefile
	tests/zfs-tests/tests/functional/zvol/Makefile
	tests/zfs-tests/tests/functional/zvol/zvol_ENOSPC/Makefile
	tests/zfs-tests/tests/functional/zvol/zvol_cli/Makefile
	tests/zfs-tests/tests/functional/zvol/zvol_misc/Makefile
	tests/zfs-tests/tests/functional/zvol/zvol_swap/Makefile
	tests/zfs-tests/tests/perf/Makefile
	tests/zfs-tests/tests/perf/fio/Makefile
	tests/zfs-tests/tests/perf/regression/Makefile
	tests/zfs-tests/tests/perf/scripts/Makefile
	tests/zfs-tests/tests/stress/Makefile
	udev/Makefile
	udev/rules.d/Makefile
	zfs.release
	])


	AC_OUTPUT
	diff --git a/sys/contrib/openzfs/include/os/freebsd/spl/sys/mod_os.h b/sys/contrib/openzfs/include/os/freebsd/spl/sys/mod_os.h
	index 5b3b3271e39e..5695abee7b85 100644
	--- a/sys/contrib/openzfs/include/os/freebsd/spl/sys/mod_os.h
	+++ b/sys/contrib/openzfs/include/os/freebsd/spl/sys/mod_os.h
	@@ -1,118 +1,124 @@
	/*
	* Copyright (c) 2020 iXsystems, Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	* $FreeBSD$
	*/

	#ifndef _SPL_MOD_H
	#define _SPL_MOD_H

	#include <sys/sysctl.h>

	#define ZFS_MODULE_DESCRIPTION(s)
	#define ZFS_MODULE_AUTHOR(s)
	#define ZFS_MODULE_LICENSE(s)
	#define ZFS_MODULE_VERSION(s)

	#define EXPORT_SYMBOL(x)
	#define module_param(a, b, c)
	#define MODULE_PARM_DESC(a, b)

	#define ZMOD_RW CTLFLAG_RWTUN
	#define ZMOD_RD CTLFLAG_RDTUN

	/* BEGIN CSTYLED */
	#define ZFS_MODULE_PARAM(scope_prefix, name_prefix, name, type, perm, desc) \
	SYSCTL_DECL(_vfs_ ## scope_prefix); \
	SYSCTL_##type(_vfs_ ## scope_prefix, OID_AUTO, name, perm, &name_prefix ## name, 0, desc)

	#define ZFS_MODULE_PARAM_ARGS SYSCTL_HANDLER_ARGS

	#define ZFS_MODULE_PARAM_CALL_IMPL(parent, name, perm, args, desc) \
	SYSCTL_DECL(parent); \
	SYSCTL_PROC(parent, OID_AUTO, name, perm \| args, desc)

	#define ZFS_MODULE_PARAM_CALL(scope_prefix, name_prefix, name, func, _, perm, desc) \
	ZFS_MODULE_PARAM_CALL_IMPL(_vfs_ ## scope_prefix, name, perm, func ## _args(name_prefix ## name), desc)

	#define ZFS_MODULE_VIRTUAL_PARAM_CALL ZFS_MODULE_PARAM_CALL

	#define param_set_arc_long_args(var) \
	CTLTYPE_ULONG, &var, 0, param_set_arc_long, "LU"

	+#define param_set_arc_min_args(var) \
	+ CTLTYPE_ULONG, &var, 0, param_set_arc_min, "LU"
	+
	+#define param_set_arc_max_args(var) \
	+ CTLTYPE_ULONG, &var, 0, param_set_arc_max, "LU"
	+
	#define param_set_arc_int_args(var) \
	CTLTYPE_INT, &var, 0, param_set_arc_int, "I"

	#define param_set_deadman_failmode_args(var) \
	CTLTYPE_STRING, NULL, 0, param_set_deadman_failmode, "A"

	#define param_set_deadman_synctime_args(var) \
	CTLTYPE_ULONG, NULL, 0, param_set_deadman_synctime, "LU"

	#define param_set_deadman_ziotime_args(var) \
	CTLTYPE_ULONG, NULL, 0, param_set_deadman_ziotime, "LU"

	#define param_set_multihost_interval_args(var) \
	CTLTYPE_ULONG, &var, 0, param_set_multihost_interval, "LU"

	#define param_set_slop_shift_args(var) \
	CTLTYPE_INT, &var, 0, param_set_slop_shift, "I"

	#define param_set_min_auto_ashift_args(var) \
	CTLTYPE_U64, &var, 0, param_set_min_auto_ashift, "QU"

	#define param_set_max_auto_ashift_args(var) \
	CTLTYPE_U64, &var, 0, param_set_max_auto_ashift, "QU"

	#define fletcher_4_param_set_args(var) \
	CTLTYPE_STRING, NULL, 0, fletcher_4_param, "A"

	#include <sys/kernel.h>
	#define module_init(fn) \
	static void \
	wrap_ ## fn(void *dummy __unused) \
	{ \
	fn(); \
	} \
	SYSINIT(zfs_ ## fn, SI_SUB_LAST, SI_ORDER_FIRST, wrap_ ## fn, NULL)

	#define module_init_early(fn) \
	static void \
	wrap_ ## fn(void *dummy __unused) \
	{ \
	fn(); \
	} \
	SYSINIT(zfs_ ## fn, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, wrap_ ## fn, NULL)

	#define module_exit(fn) \
	static void \
	wrap_ ## fn(void *dummy __unused) \
	{ \
	fn(); \
	} \
	SYSUNINIT(zfs_ ## fn, SI_SUB_LAST, SI_ORDER_FIRST, wrap_ ## fn, NULL)
	/* END CSTYLED */

	#endif /* SPL_MOD_H */
	diff --git a/sys/contrib/openzfs/include/os/freebsd/spl/sys/random.h b/sys/contrib/openzfs/include/os/freebsd/spl/sys/random.h
	index b3c9115f5305..7583166e727b 100644
	--- a/sys/contrib/openzfs/include/os/freebsd/spl/sys/random.h
	+++ b/sys/contrib/openzfs/include/os/freebsd/spl/sys/random.h
	@@ -1,48 +1,70 @@
	/*
	* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	* $FreeBSD$
	*/

	#ifndef _OPENSOLARIS_SYS_RANDOM_H_
	#define _OPENSOLARIS_SYS_RANDOM_H_

	#include_next <sys/random.h>
	+#if __FreeBSD_version >= 1300108
	+#include <sys/prng.h>
	+#endif

	static inline int
	random_get_bytes(uint8_t *p, size_t s)
	{
	arc4rand(p, (int)s, 0);
	return (0);
	}

	static inline int
	random_get_pseudo_bytes(uint8_t *p, size_t s)
	{
	arc4rand(p, (int)s, 0);
	return (0);
	}

	+static inline uint32_t
	+random_in_range(uint32_t range)
	+{
	+#if defined(_KERNEL) && __FreeBSD_version >= 1300108
	+ return (prng32_bounded(range));
	+#else
	+ uint32_t r;
	+
	+ ASSERT(range != 0);
	+
	+ if (range == 1)
	+ return (0);
	+
	+ (void) random_get_pseudo_bytes((uint8_t *)&r, sizeof (r));
	+
	+ return (r % range);
	+#endif
	+}
	+
	#endif /* !_OPENSOLARIS_SYS_RANDOM_H_ */
	diff --git a/sys/contrib/openzfs/include/os/linux/kernel/linux/blkdev_compat.h b/sys/contrib/openzfs/include/os/linux/kernel/linux/blkdev_compat.h
	index 87d541072015..019d5390adec 100644
	--- a/sys/contrib/openzfs/include/os/linux/kernel/linux/blkdev_compat.h
	+++ b/sys/contrib/openzfs/include/os/linux/kernel/linux/blkdev_compat.h
	@@ -1,579 +1,582 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
	* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
	* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
	* LLNL-CODE-403049.
	*/

	#ifndef _ZFS_BLKDEV_H
	#define _ZFS_BLKDEV_H

	#include <linux/blkdev.h>
	#include <linux/elevator.h>
	#include <linux/backing-dev.h>
	#include <linux/hdreg.h>
	#include <linux/msdos_fs.h> /* for SECTOR_* */

	#ifndef HAVE_BLK_QUEUE_FLAG_SET
	static inline void
	blk_queue_flag_set(unsigned int flag, struct request_queue *q)
	{
	queue_flag_set(flag, q);
	}
	#endif

	#ifndef HAVE_BLK_QUEUE_FLAG_CLEAR
	static inline void
	blk_queue_flag_clear(unsigned int flag, struct request_queue *q)
	{
	queue_flag_clear(flag, q);
	}
	#endif

	/*
	* 4.7 API,
	* The blk_queue_write_cache() interface has replaced blk_queue_flush()
	* interface. However, the new interface is GPL-only thus we implement
	* our own trivial wrapper when the GPL-only version is detected.
	*
	* 2.6.36 - 4.6 API,
	* The blk_queue_flush() interface has replaced blk_queue_ordered()
	* interface. However, while the old interface was available to all the
	* new one is GPL-only. Thus if the GPL-only version is detected we
	* implement our own trivial helper.
	*/
	static inline void
	blk_queue_set_write_cache(struct request_queue *q, bool wc, bool fua)
	{
	#if defined(HAVE_BLK_QUEUE_WRITE_CACHE_GPL_ONLY)
	if (wc)
	blk_queue_flag_set(QUEUE_FLAG_WC, q);
	else
	blk_queue_flag_clear(QUEUE_FLAG_WC, q);
	if (fua)
	blk_queue_flag_set(QUEUE_FLAG_FUA, q);
	else
	blk_queue_flag_clear(QUEUE_FLAG_FUA, q);
	#elif defined(HAVE_BLK_QUEUE_WRITE_CACHE)
	blk_queue_write_cache(q, wc, fua);
	#elif defined(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY)
	if (wc)
	q->flush_flags \|= REQ_FLUSH;
	if (fua)
	q->flush_flags \|= REQ_FUA;
	#elif defined(HAVE_BLK_QUEUE_FLUSH)
	blk_queue_flush(q, (wc ? REQ_FLUSH : 0) \| (fua ? REQ_FUA : 0));
	#else
	#error "Unsupported kernel"
	#endif
	}

	static inline void
	blk_queue_set_read_ahead(struct request_queue *q, unsigned long ra_pages)
	{
	+#if !defined(HAVE_BLK_QUEUE_UPDATE_READAHEAD) && \
	+ !defined(HAVE_DISK_UPDATE_READAHEAD)
	#ifdef HAVE_BLK_QUEUE_BDI_DYNAMIC
	q->backing_dev_info->ra_pages = ra_pages;
	#else
	q->backing_dev_info.ra_pages = ra_pages;
	#endif
	+#endif
	}

	#ifdef HAVE_BIO_BVEC_ITER
	#define BIO_BI_SECTOR(bio) (bio)->bi_iter.bi_sector
	#define BIO_BI_SIZE(bio) (bio)->bi_iter.bi_size
	#define BIO_BI_IDX(bio) (bio)->bi_iter.bi_idx
	#define BIO_BI_SKIP(bio) (bio)->bi_iter.bi_bvec_done
	#define bio_for_each_segment4(bv, bvp, b, i) \
	bio_for_each_segment((bv), (b), (i))
	typedef struct bvec_iter bvec_iterator_t;
	#else
	#define BIO_BI_SECTOR(bio) (bio)->bi_sector
	#define BIO_BI_SIZE(bio) (bio)->bi_size
	#define BIO_BI_IDX(bio) (bio)->bi_idx
	#define BIO_BI_SKIP(bio) (0)
	#define bio_for_each_segment4(bv, bvp, b, i) \
	bio_for_each_segment((bvp), (b), (i))
	typedef int bvec_iterator_t;
	#endif

	static inline void
	bio_set_flags_failfast(struct block_device bdev, int flags)
	{
	#ifdef CONFIG_BUG
	/*
	* Disable FAILFAST for loopback devices because of the
	* following incorrect BUG_ON() in loop_make_request().
	* This support is also disabled for md devices because the
	* test suite layers md devices on top of loopback devices.
	* This may be removed when the loopback driver is fixed.
	*
	* BUG_ON(!lo \|\| (rw != READ && rw != WRITE));
	*/
	if ((MAJOR(bdev->bd_dev) == LOOP_MAJOR) \|\|
	(MAJOR(bdev->bd_dev) == MD_MAJOR))
	return;

	#ifdef BLOCK_EXT_MAJOR
	if (MAJOR(bdev->bd_dev) == BLOCK_EXT_MAJOR)
	return;
	#endif /* BLOCK_EXT_MAJOR */
	#endif /* CONFIG_BUG */

	*flags \|= REQ_FAILFAST_MASK;
	}

	/*
	* Maximum disk label length, it may be undefined for some kernels.
	*/
	#if !defined(DISK_NAME_LEN)
	#define DISK_NAME_LEN 32
	#endif /* DISK_NAME_LEN */

	#ifdef HAVE_BIO_BI_STATUS
	static inline int
	bi_status_to_errno(blk_status_t status)
	{
	switch (status) {
	case BLK_STS_OK:
	return (0);
	case BLK_STS_NOTSUPP:
	return (EOPNOTSUPP);
	case BLK_STS_TIMEOUT:
	return (ETIMEDOUT);
	case BLK_STS_NOSPC:
	return (ENOSPC);
	case BLK_STS_TRANSPORT:
	return (ENOLINK);
	case BLK_STS_TARGET:
	return (EREMOTEIO);
	case BLK_STS_NEXUS:
	return (EBADE);
	case BLK_STS_MEDIUM:
	return (ENODATA);
	case BLK_STS_PROTECTION:
	return (EILSEQ);
	case BLK_STS_RESOURCE:
	return (ENOMEM);
	case BLK_STS_AGAIN:
	return (EAGAIN);
	case BLK_STS_IOERR:
	return (EIO);
	default:
	return (EIO);
	}
	}

	static inline blk_status_t
	errno_to_bi_status(int error)
	{
	switch (error) {
	case 0:
	return (BLK_STS_OK);
	case EOPNOTSUPP:
	return (BLK_STS_NOTSUPP);
	case ETIMEDOUT:
	return (BLK_STS_TIMEOUT);
	case ENOSPC:
	return (BLK_STS_NOSPC);
	case ENOLINK:
	return (BLK_STS_TRANSPORT);
	case EREMOTEIO:
	return (BLK_STS_TARGET);
	case EBADE:
	return (BLK_STS_NEXUS);
	case ENODATA:
	return (BLK_STS_MEDIUM);
	case EILSEQ:
	return (BLK_STS_PROTECTION);
	case ENOMEM:
	return (BLK_STS_RESOURCE);
	case EAGAIN:
	return (BLK_STS_AGAIN);
	case EIO:
	return (BLK_STS_IOERR);
	default:
	return (BLK_STS_IOERR);
	}
	}
	#endif /* HAVE_BIO_BI_STATUS */

	/*
	* 4.3 API change
	* The bio_endio() prototype changed slightly. These are helper
	* macro's to ensure the prototype and invocation are handled.
	*/
	#ifdef HAVE_1ARG_BIO_END_IO_T
	#ifdef HAVE_BIO_BI_STATUS
	#define BIO_END_IO_ERROR(bio) bi_status_to_errno(bio->bi_status)
	#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x)
	#define BIO_END_IO(bio, error) bio_set_bi_status(bio, error)
	static inline void
	bio_set_bi_status(struct bio *bio, int error)
	{
	ASSERT3S(error, <=, 0);
	bio->bi_status = errno_to_bi_status(-error);
	bio_endio(bio);
	}
	#else
	#define BIO_END_IO_ERROR(bio) (-(bio->bi_error))
	#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x)
	#define BIO_END_IO(bio, error) bio_set_bi_error(bio, error)
	static inline void
	bio_set_bi_error(struct bio *bio, int error)
	{
	ASSERT3S(error, <=, 0);
	bio->bi_error = error;
	bio_endio(bio);
	}
	#endif /* HAVE_BIO_BI_STATUS */

	#else
	#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x, int z)
	#define BIO_END_IO(bio, error) bio_endio(bio, error);
	#endif /* HAVE_1ARG_BIO_END_IO_T */

	/*
	* 4.1 API,
	* 3.10.0 CentOS 7.x API,
	* blkdev_reread_part()
	*
	* For older kernels trigger a re-reading of the partition table by calling
	* check_disk_change() which calls flush_disk() to invalidate the device.
	*
	* For newer kernels (as of 5.10), bdev_check_media_change is used, in favor of
	* check_disk_change(), with the modification that invalidation is no longer
	* forced.
	*/
	#ifdef HAVE_CHECK_DISK_CHANGE
	#define zfs_check_media_change(bdev) check_disk_change(bdev)
	#ifdef HAVE_BLKDEV_REREAD_PART
	#define vdev_bdev_reread_part(bdev) blkdev_reread_part(bdev)
	#else
	#define vdev_bdev_reread_part(bdev) check_disk_change(bdev)
	#endif /* HAVE_BLKDEV_REREAD_PART */
	#else
	#ifdef HAVE_BDEV_CHECK_MEDIA_CHANGE
	static inline int
	zfs_check_media_change(struct block_device *bdev)
	{
	#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
	struct gendisk *gd = bdev->bd_disk;
	const struct block_device_operations *bdo = gd->fops;
	#endif

	if (!bdev_check_media_change(bdev))
	return (0);

	#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
	/*
	* Force revalidation, to mimic the old behavior of
	* check_disk_change()
	*/
	if (bdo->revalidate_disk)
	bdo->revalidate_disk(gd);
	#endif

	return (0);
	}
	#define vdev_bdev_reread_part(bdev) zfs_check_media_change(bdev)
	#else
	/*
	* This is encountered if check_disk_change() and bdev_check_media_change()
	* are not available in the kernel - likely due to an API change that needs
	* to be chased down.
	*/
	#error "Unsupported kernel: no usable disk change check"
	#endif /* HAVE_BDEV_CHECK_MEDIA_CHANGE */
	#endif /* HAVE_CHECK_DISK_CHANGE */

	/*
	* 2.6.27 API change
	* The function was exported for use, prior to this it existed but the
	* symbol was not exported.
	*
	* 4.4.0-6.21 API change for Ubuntu
	* lookup_bdev() gained a second argument, FMODE_*, to check inode permissions.
	*
	* 5.11 API change
	* Changed to take a dev_t argument which is set on success and return a
	* non-zero error code on failure.
	*/
	static inline int
	vdev_lookup_bdev(const char path, dev_t dev)
	{
	#if defined(HAVE_DEVT_LOOKUP_BDEV)
	return (lookup_bdev(path, dev));
	#elif defined(HAVE_1ARG_LOOKUP_BDEV)
	struct block_device *bdev = lookup_bdev(path);
	if (IS_ERR(bdev))
	return (PTR_ERR(bdev));

	*dev = bdev->bd_dev;
	bdput(bdev);

	return (0);
	#elif defined(HAVE_MODE_LOOKUP_BDEV)
	struct block_device *bdev = lookup_bdev(path, FMODE_READ);
	if (IS_ERR(bdev))
	return (PTR_ERR(bdev));

	*dev = bdev->bd_dev;
	bdput(bdev);

	return (0);
	#else
	#error "Unsupported kernel"
	#endif
	}

	/*
	* Kernels without bio_set_op_attrs use bi_rw for the bio flags.
	*/
	#if !defined(HAVE_BIO_SET_OP_ATTRS)
	static inline void
	bio_set_op_attrs(struct bio *bio, unsigned rw, unsigned flags)
	{
	bio->bi_rw \|= rw \| flags;
	}
	#endif

	/*
	* bio_set_flush - Set the appropriate flags in a bio to guarantee
	* data are on non-volatile media on completion.
	*
	* 2.6.37 - 4.8 API,
	* Introduce WRITE_FLUSH, WRITE_FUA, and WRITE_FLUSH_FUA flags as a
	* replacement for WRITE_BARRIER to allow expressing richer semantics
	* to the block layer. It's up to the block layer to implement the
	* semantics correctly. Use the WRITE_FLUSH_FUA flag combination.
	*
	* 4.8 - 4.9 API,
	* REQ_FLUSH was renamed to REQ_PREFLUSH. For consistency with previous
	* OpenZFS releases, prefer the WRITE_FLUSH_FUA flag set if it's available.
	*
	* 4.10 API,
	* The read/write flags and their modifiers, including WRITE_FLUSH,
	* WRITE_FUA and WRITE_FLUSH_FUA were removed from fs.h in
	* torvalds/linux@70fd7614 and replaced by direct flag modification
	* of the REQ_ flags in bio->bi_opf. Use REQ_PREFLUSH.
	*/
	static inline void
	bio_set_flush(struct bio *bio)
	{
	#if defined(HAVE_REQ_PREFLUSH) /* >= 4.10 */
	bio_set_op_attrs(bio, 0, REQ_PREFLUSH);
	#elif defined(WRITE_FLUSH_FUA) /* >= 2.6.37 and <= 4.9 */
	bio_set_op_attrs(bio, 0, WRITE_FLUSH_FUA);
	#else
	#error "Allowing the build will cause bio_set_flush requests to be ignored."
	#endif
	}

	/*
	* 4.8 API,
	* REQ_OP_FLUSH
	*
	* 4.8-rc0 - 4.8-rc1,
	* REQ_PREFLUSH
	*
	* 2.6.36 - 4.7 API,
	* REQ_FLUSH
	*
	* in all cases but may have a performance impact for some kernels. It
	* has the advantage of minimizing kernel specific changes in the zvol code.
	*
	*/
	static inline boolean_t
	bio_is_flush(struct bio *bio)
	{
	#if defined(HAVE_REQ_OP_FLUSH) && defined(HAVE_BIO_BI_OPF)
	return ((bio_op(bio) == REQ_OP_FLUSH) \|\| (bio->bi_opf & REQ_PREFLUSH));
	#elif defined(HAVE_REQ_PREFLUSH) && defined(HAVE_BIO_BI_OPF)
	return (bio->bi_opf & REQ_PREFLUSH);
	#elif defined(HAVE_REQ_PREFLUSH) && !defined(HAVE_BIO_BI_OPF)
	return (bio->bi_rw & REQ_PREFLUSH);
	#elif defined(HAVE_REQ_FLUSH)
	return (bio->bi_rw & REQ_FLUSH);
	#else
	#error "Unsupported kernel"
	#endif
	}

	/*
	* 4.8 API,
	* REQ_FUA flag moved to bio->bi_opf
	*
	* 2.6.x - 4.7 API,
	* REQ_FUA
	*/
	static inline boolean_t
	bio_is_fua(struct bio *bio)
	{
	#if defined(HAVE_BIO_BI_OPF)
	return (bio->bi_opf & REQ_FUA);
	#elif defined(REQ_FUA)
	return (bio->bi_rw & REQ_FUA);
	#else
	#error "Allowing the build will cause fua requests to be ignored."
	#endif
	}

	/*
	* 4.8 API,
	* REQ_OP_DISCARD
	*
	* 2.6.36 - 4.7 API,
	* REQ_DISCARD
	*
	* In all cases the normal I/O path is used for discards. The only
	* difference is how the kernel tags individual I/Os as discards.
	*/
	static inline boolean_t
	bio_is_discard(struct bio *bio)
	{
	#if defined(HAVE_REQ_OP_DISCARD)
	return (bio_op(bio) == REQ_OP_DISCARD);
	#elif defined(HAVE_REQ_DISCARD)
	return (bio->bi_rw & REQ_DISCARD);
	#else
	#error "Unsupported kernel"
	#endif
	}

	/*
	* 4.8 API,
	* REQ_OP_SECURE_ERASE
	*
	* 2.6.36 - 4.7 API,
	* REQ_SECURE
	*/
	static inline boolean_t
	bio_is_secure_erase(struct bio *bio)
	{
	#if defined(HAVE_REQ_OP_SECURE_ERASE)
	return (bio_op(bio) == REQ_OP_SECURE_ERASE);
	#elif defined(REQ_SECURE)
	return (bio->bi_rw & REQ_SECURE);
	#else
	return (0);
	#endif
	}

	/*
	* 2.6.33 API change
	* Discard granularity and alignment restrictions may now be set. For
	* older kernels which do not support this it is safe to skip it.
	*/
	static inline void
	blk_queue_discard_granularity(struct request_queue *q, unsigned int dg)
	{
	q->limits.discard_granularity = dg;
	}

	/*
	* 4.8 API,
	* blk_queue_secure_erase()
	*
	* 2.6.36 - 4.7 API,
	* blk_queue_secdiscard()
	*/
	static inline int
	blk_queue_discard_secure(struct request_queue *q)
	{
	#if defined(HAVE_BLK_QUEUE_SECURE_ERASE)
	return (blk_queue_secure_erase(q));
	#elif defined(HAVE_BLK_QUEUE_SECDISCARD)
	return (blk_queue_secdiscard(q));
	#else
	return (0);
	#endif
	}

	/*
	* A common holder for vdev_bdev_open() is used to relax the exclusive open
	* semantics slightly. Internal vdev disk callers may pass VDEV_HOLDER to
	* allow them to open the device multiple times. Other kernel callers and
	* user space processes which don't pass this value will get EBUSY. This is
	* currently required for the correct operation of hot spares.
	*/
	#define VDEV_HOLDER ((void *)0x2401de7)

	static inline unsigned long
	blk_generic_start_io_acct(struct request_queue *q __attribute__((unused)),
	struct gendisk *disk __attribute__((unused)),
	int rw __attribute__((unused)), struct bio *bio)
	{
	#if defined(HAVE_DISK_IO_ACCT)
	return (disk_start_io_acct(disk, bio_sectors(bio), bio_op(bio)));
	#elif defined(HAVE_BIO_IO_ACCT)
	return (bio_start_io_acct(bio));
	#elif defined(HAVE_GENERIC_IO_ACCT_3ARG)
	unsigned long start_time = jiffies;
	generic_start_io_acct(rw, bio_sectors(bio), &disk->part0);
	return (start_time);
	#elif defined(HAVE_GENERIC_IO_ACCT_4ARG)
	unsigned long start_time = jiffies;
	generic_start_io_acct(q, rw, bio_sectors(bio), &disk->part0);
	return (start_time);
	#else
	/* Unsupported */
	return (0);
	#endif
	}

	static inline void
	blk_generic_end_io_acct(struct request_queue *q __attribute__((unused)),
	struct gendisk *disk __attribute__((unused)),
	int rw __attribute__((unused)), struct bio *bio, unsigned long start_time)
	{
	#if defined(HAVE_DISK_IO_ACCT)
	disk_end_io_acct(disk, bio_op(bio), start_time);
	#elif defined(HAVE_BIO_IO_ACCT)
	bio_end_io_acct(bio, start_time);
	#elif defined(HAVE_GENERIC_IO_ACCT_3ARG)
	generic_end_io_acct(rw, &disk->part0, start_time);
	#elif defined(HAVE_GENERIC_IO_ACCT_4ARG)
	generic_end_io_acct(q, rw, &disk->part0, start_time);
	#endif
	}

	#ifndef HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS
	static inline struct request_queue *
	blk_generic_alloc_queue(make_request_fn make_request, int node_id)
	{
	#if defined(HAVE_BLK_ALLOC_QUEUE_REQUEST_FN)
	return (blk_alloc_queue(make_request, node_id));
	#elif defined(HAVE_BLK_ALLOC_QUEUE_REQUEST_FN_RH)
	return (blk_alloc_queue_rh(make_request, node_id));
	#else
	struct request_queue *q = blk_alloc_queue(GFP_KERNEL);
	if (q != NULL)
	blk_queue_make_request(q, make_request);

	return (q);
	#endif
	}
	#endif /* !HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS */

	#endif /* _ZFS_BLKDEV_H */
	diff --git a/sys/contrib/openzfs/include/os/linux/spl/sys/cmn_err.h b/sys/contrib/openzfs/include/os/linux/spl/sys/cmn_err.h
	index 314bbbaf9e95..f46efdefa9bd 100644
	--- a/sys/contrib/openzfs/include/os/linux/spl/sys/cmn_err.h
	+++ b/sys/contrib/openzfs/include/os/linux/spl/sys/cmn_err.h
	@@ -1,41 +1,45 @@
	/*
	* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
	* Copyright (C) 2007 The Regents of the University of California.
	* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
	* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
	* UCRL-CODE-235197
	*
	* This file is part of the SPL, Solaris Porting Layer.
	*
	* The SPL is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	* The SPL is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with the SPL. If not, see <http://www.gnu.org/licenses/>.
	*/

	#ifndef _SPL_CMN_ERR_H
	#define _SPL_CMN_ERR_H

	+#if defined(_KERNEL) && defined(HAVE_STANDALONE_LINUX_STDARG)
	+#include <linux/stdarg.h>
	+#else
	#include <stdarg.h>
	+#endif

	#define CE_CONT 0 /* continuation */
	#define CE_NOTE 1 /* notice */
	#define CE_WARN 2 /* warning */
	#define CE_PANIC 3 /* panic */
	#define CE_IGNORE 4 /* print nothing */

	extern void cmn_err(int, const char *, ...);
	extern void vcmn_err(int, const char *, va_list);
	extern void vpanic(const char *, va_list);

	#define fm_panic panic

	#endif /* SPL_CMN_ERR_H */
	diff --git a/sys/contrib/openzfs/include/os/linux/spl/sys/random.h b/sys/contrib/openzfs/include/os/linux/spl/sys/random.h
	index 1b8cb60d094f..52e97e1ce068 100644
	--- a/sys/contrib/openzfs/include/os/linux/spl/sys/random.h
	+++ b/sys/contrib/openzfs/include/os/linux/spl/sys/random.h
	@@ -1,39 +1,54 @@
	/*
	* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
	* Copyright (C) 2007 The Regents of the University of California.
	* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
	* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
	* UCRL-CODE-235197
	*
	* This file is part of the SPL, Solaris Porting Layer.
	*
	* The SPL is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	* The SPL is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with the SPL. If not, see <http://www.gnu.org/licenses/>.
	*/

	#ifndef _SPL_RANDOM_H
	#define _SPL_RANDOM_H

	#include <linux/module.h>
	#include <linux/random.h>

	static __inline__ int
	random_get_bytes(uint8_t *ptr, size_t len)
	{
	get_random_bytes((void *)ptr, (int)len);
	return (0);
	}

	extern int random_get_pseudo_bytes(uint8_t *ptr, size_t len);

	+static __inline__ uint32_t
	+random_in_range(uint32_t range)
	+{
	+ uint32_t r;
	+
	+ ASSERT(range != 0);
	+
	+ if (range == 1)
	+ return (0);
	+
	+ (void) random_get_pseudo_bytes((uint8_t *)&r, sizeof (r));
	+
	+ return (r % range);
	+}
	+
	#endif /* _SPL_RANDOM_H */
	diff --git a/sys/contrib/openzfs/include/os/linux/zfs/sys/trace_arc.h b/sys/contrib/openzfs/include/os/linux/zfs/sys/trace_arc.h
	index 3df491f8b392..d3410bc07a32 100644
	--- a/sys/contrib/openzfs/include/os/linux/zfs/sys/trace_arc.h
	+++ b/sys/contrib/openzfs/include/os/linux/zfs/sys/trace_arc.h
	@@ -1,419 +1,419 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	#include <sys/list.h>

	#if defined(_KERNEL)
	#if defined(HAVE_DECLARE_EVENT_CLASS)

	#undef TRACE_SYSTEM
	#define TRACE_SYSTEM zfs

	#undef TRACE_SYSTEM_VAR
	#define TRACE_SYSTEM_VAR zfs_arc

	#if !defined(_TRACE_ARC_H) \|\| defined(TRACE_HEADER_MULTI_READ)
	#define _TRACE_ARC_H

	#include <linux/tracepoint.h>
	#include <sys/types.h>
	#include <sys/trace_common.h> /* For ZIO macros */

	/*
	* Generic support for one argument tracepoints of the form:
	*
	* DTRACE_PROBE1(...,
	* arc_buf_hdr_t *, ...);
	*/
	/* BEGIN CSTYLED */
	DECLARE_EVENT_CLASS(zfs_arc_buf_hdr_class,
	TP_PROTO(arc_buf_hdr_t *ab),
	TP_ARGS(ab),
	TP_STRUCT__entry(
	__array(uint64_t, hdr_dva_word, 2)
	__field(uint64_t, hdr_birth)
	__field(uint32_t, hdr_flags)
	__field(uint32_t, hdr_bufcnt)
	__field(arc_buf_contents_t, hdr_type)
	__field(uint16_t, hdr_psize)
	__field(uint16_t, hdr_lsize)
	__field(uint64_t, hdr_spa)
	__field(arc_state_type_t, hdr_state_type)
	__field(clock_t, hdr_access)
	__field(uint32_t, hdr_mru_hits)
	__field(uint32_t, hdr_mru_ghost_hits)
	__field(uint32_t, hdr_mfu_hits)
	__field(uint32_t, hdr_mfu_ghost_hits)
	__field(uint32_t, hdr_l2_hits)
	__field(int64_t, hdr_refcount)
	),
	TP_fast_assign(
	__entry->hdr_dva_word[0] = ab->b_dva.dva_word[0];
	__entry->hdr_dva_word[1] = ab->b_dva.dva_word[1];
	__entry->hdr_birth = ab->b_birth;
	__entry->hdr_flags = ab->b_flags;
	__entry->hdr_bufcnt = ab->b_l1hdr.b_bufcnt;
	__entry->hdr_psize = ab->b_psize;
	__entry->hdr_lsize = ab->b_lsize;
	__entry->hdr_spa = ab->b_spa;
	__entry->hdr_state_type = ab->b_l1hdr.b_state->arcs_state;
	__entry->hdr_access = ab->b_l1hdr.b_arc_access;
	__entry->hdr_mru_hits = ab->b_l1hdr.b_mru_hits;
	__entry->hdr_mru_ghost_hits = ab->b_l1hdr.b_mru_ghost_hits;
	__entry->hdr_mfu_hits = ab->b_l1hdr.b_mfu_hits;
	__entry->hdr_mfu_ghost_hits = ab->b_l1hdr.b_mfu_ghost_hits;
	- __entry->hdr_l2_hits = ab->b_l1hdr.b_l2_hits;
	+ __entry->hdr_l2_hits = ab->b_l2hdr.b_hits;
	__entry->hdr_refcount = ab->b_l1hdr.b_refcnt.rc_count;
	),
	TP_printk("hdr { dva 0x%llx:0x%llx birth %llu "
	"flags 0x%x bufcnt %u type %u psize %u lsize %u spa %llu "
	"state_type %u access %lu mru_hits %u mru_ghost_hits %u "
	"mfu_hits %u mfu_ghost_hits %u l2_hits %u refcount %lli }",
	__entry->hdr_dva_word[0], __entry->hdr_dva_word[1],
	__entry->hdr_birth, __entry->hdr_flags,
	__entry->hdr_bufcnt, __entry->hdr_type, __entry->hdr_psize,
	__entry->hdr_lsize, __entry->hdr_spa, __entry->hdr_state_type,
	__entry->hdr_access, __entry->hdr_mru_hits,
	__entry->hdr_mru_ghost_hits, __entry->hdr_mfu_hits,
	__entry->hdr_mfu_ghost_hits, __entry->hdr_l2_hits,
	__entry->hdr_refcount)
	);
	/* END CSTYLED */

	/* BEGIN CSTYLED */
	#define DEFINE_ARC_BUF_HDR_EVENT(name) \
	DEFINE_EVENT(zfs_arc_buf_hdr_class, name, \
	TP_PROTO(arc_buf_hdr_t *ab), \
	TP_ARGS(ab))
	/* END CSTYLED */
	DEFINE_ARC_BUF_HDR_EVENT(zfs_arc__hit);
	DEFINE_ARC_BUF_HDR_EVENT(zfs_arc__evict);
	DEFINE_ARC_BUF_HDR_EVENT(zfs_arc__delete);
	DEFINE_ARC_BUF_HDR_EVENT(zfs_new_state__mru);
	DEFINE_ARC_BUF_HDR_EVENT(zfs_new_state__mfu);
	DEFINE_ARC_BUF_HDR_EVENT(zfs_arc__async__upgrade__sync);
	DEFINE_ARC_BUF_HDR_EVENT(zfs_arc__demand__hit__predictive__prefetch);
	DEFINE_ARC_BUF_HDR_EVENT(zfs_l2arc__hit);
	DEFINE_ARC_BUF_HDR_EVENT(zfs_l2arc__miss);

	/*
	* Generic support for two argument tracepoints of the form:
	*
	* DTRACE_PROBE2(...,
	* vdev_t *, ...,
	* zio_t *, ...);
	*/
	/* BEGIN CSTYLED */
	DECLARE_EVENT_CLASS(zfs_l2arc_rw_class,
	TP_PROTO(vdev_t vd, zio_t zio),
	TP_ARGS(vd, zio),
	TP_STRUCT__entry(
	__field(uint64_t, vdev_id)
	__field(uint64_t, vdev_guid)
	__field(uint64_t, vdev_state)
	ZIO_TP_STRUCT_ENTRY
	),
	TP_fast_assign(
	__entry->vdev_id = vd->vdev_id;
	__entry->vdev_guid = vd->vdev_guid;
	__entry->vdev_state = vd->vdev_state;
	ZIO_TP_FAST_ASSIGN
	),
	TP_printk("vdev { id %llu guid %llu state %llu } "
	ZIO_TP_PRINTK_FMT, __entry->vdev_id, __entry->vdev_guid,
	__entry->vdev_state, ZIO_TP_PRINTK_ARGS)
	);
	/* END CSTYLED */

	/* BEGIN CSTYLED */
	#define DEFINE_L2ARC_RW_EVENT(name) \
	DEFINE_EVENT(zfs_l2arc_rw_class, name, \
	TP_PROTO(vdev_t vd, zio_t zio), \
	TP_ARGS(vd, zio))
	/* END CSTYLED */
	DEFINE_L2ARC_RW_EVENT(zfs_l2arc__read);
	DEFINE_L2ARC_RW_EVENT(zfs_l2arc__write);


	/*
	* Generic support for two argument tracepoints of the form:
	*
	* DTRACE_PROBE2(...,
	* zio_t *, ...,
	* l2arc_write_callback_t *, ...);
	*/
	/* BEGIN CSTYLED */
	DECLARE_EVENT_CLASS(zfs_l2arc_iodone_class,
	TP_PROTO(zio_t zio, l2arc_write_callback_t cb),
	TP_ARGS(zio, cb),
	TP_STRUCT__entry(ZIO_TP_STRUCT_ENTRY),
	TP_fast_assign(ZIO_TP_FAST_ASSIGN),
	TP_printk(ZIO_TP_PRINTK_FMT, ZIO_TP_PRINTK_ARGS)
	);
	/* END CSTYLED */

	/* BEGIN CSTYLED */
	#define DEFINE_L2ARC_IODONE_EVENT(name) \
	DEFINE_EVENT(zfs_l2arc_iodone_class, name, \
	TP_PROTO(zio_t zio, l2arc_write_callback_t cb), \
	TP_ARGS(zio, cb))
	/* END CSTYLED */
	DEFINE_L2ARC_IODONE_EVENT(zfs_l2arc__iodone);


	/*
	* Generic support for four argument tracepoints of the form:
	*
	* DTRACE_PROBE4(...,
	* arc_buf_hdr_t *, ...,
	* const blkptr_t *,
	* uint64_t,
	* const zbookmark_phys_t *);
	*/
	/* BEGIN CSTYLED */
	DECLARE_EVENT_CLASS(zfs_arc_miss_class,
	TP_PROTO(arc_buf_hdr_t *hdr,
	const blkptr_t bp, uint64_t size, const zbookmark_phys_t zb),
	TP_ARGS(hdr, bp, size, zb),
	TP_STRUCT__entry(
	__array(uint64_t, hdr_dva_word, 2)
	__field(uint64_t, hdr_birth)
	__field(uint32_t, hdr_flags)
	__field(uint32_t, hdr_bufcnt)
	__field(arc_buf_contents_t, hdr_type)
	__field(uint16_t, hdr_psize)
	__field(uint16_t, hdr_lsize)
	__field(uint64_t, hdr_spa)
	__field(arc_state_type_t, hdr_state_type)
	__field(clock_t, hdr_access)
	__field(uint32_t, hdr_mru_hits)
	__field(uint32_t, hdr_mru_ghost_hits)
	__field(uint32_t, hdr_mfu_hits)
	__field(uint32_t, hdr_mfu_ghost_hits)
	__field(uint32_t, hdr_l2_hits)
	__field(int64_t, hdr_refcount)

	__array(uint64_t, bp_dva0, 2)
	__array(uint64_t, bp_dva1, 2)
	__array(uint64_t, bp_dva2, 2)
	__array(uint64_t, bp_cksum, 4)

	__field(uint64_t, bp_lsize)

	__field(uint64_t, zb_objset)
	__field(uint64_t, zb_object)
	__field(int64_t, zb_level)
	__field(uint64_t, zb_blkid)
	),
	TP_fast_assign(
	__entry->hdr_dva_word[0] = hdr->b_dva.dva_word[0];
	__entry->hdr_dva_word[1] = hdr->b_dva.dva_word[1];
	__entry->hdr_birth = hdr->b_birth;
	__entry->hdr_flags = hdr->b_flags;
	__entry->hdr_bufcnt = hdr->b_l1hdr.b_bufcnt;
	__entry->hdr_psize = hdr->b_psize;
	__entry->hdr_lsize = hdr->b_lsize;
	__entry->hdr_spa = hdr->b_spa;
	__entry->hdr_state_type = hdr->b_l1hdr.b_state->arcs_state;
	__entry->hdr_access = hdr->b_l1hdr.b_arc_access;
	__entry->hdr_mru_hits = hdr->b_l1hdr.b_mru_hits;
	__entry->hdr_mru_ghost_hits = hdr->b_l1hdr.b_mru_ghost_hits;
	__entry->hdr_mfu_hits = hdr->b_l1hdr.b_mfu_hits;
	__entry->hdr_mfu_ghost_hits = hdr->b_l1hdr.b_mfu_ghost_hits;
	- __entry->hdr_l2_hits = hdr->b_l1hdr.b_l2_hits;
	+ __entry->hdr_l2_hits = hdr->b_l2hdr.b_hits;
	__entry->hdr_refcount = hdr->b_l1hdr.b_refcnt.rc_count;

	__entry->bp_dva0[0] = bp->blk_dva[0].dva_word[0];
	__entry->bp_dva0[1] = bp->blk_dva[0].dva_word[1];
	__entry->bp_dva1[0] = bp->blk_dva[1].dva_word[0];
	__entry->bp_dva1[1] = bp->blk_dva[1].dva_word[1];
	__entry->bp_dva2[0] = bp->blk_dva[2].dva_word[0];
	__entry->bp_dva2[1] = bp->blk_dva[2].dva_word[1];
	__entry->bp_cksum[0] = bp->blk_cksum.zc_word[0];
	__entry->bp_cksum[1] = bp->blk_cksum.zc_word[1];
	__entry->bp_cksum[2] = bp->blk_cksum.zc_word[2];
	__entry->bp_cksum[3] = bp->blk_cksum.zc_word[3];

	__entry->bp_lsize = size;

	__entry->zb_objset = zb->zb_objset;
	__entry->zb_object = zb->zb_object;
	__entry->zb_level = zb->zb_level;
	__entry->zb_blkid = zb->zb_blkid;
	),
	TP_printk("hdr { dva 0x%llx:0x%llx birth %llu "
	"flags 0x%x bufcnt %u psize %u lsize %u spa %llu state_type %u "
	"access %lu mru_hits %u mru_ghost_hits %u mfu_hits %u "
	"mfu_ghost_hits %u l2_hits %u refcount %lli } "
	"bp { dva0 0x%llx:0x%llx dva1 0x%llx:0x%llx dva2 "
	"0x%llx:0x%llx cksum 0x%llx:0x%llx:0x%llx:0x%llx "
	"lsize %llu } zb { objset %llu object %llu level %lli "
	"blkid %llu }",
	__entry->hdr_dva_word[0], __entry->hdr_dva_word[1],
	__entry->hdr_birth, __entry->hdr_flags,
	__entry->hdr_bufcnt, __entry->hdr_psize, __entry->hdr_lsize,
	__entry->hdr_spa, __entry->hdr_state_type, __entry->hdr_access,
	__entry->hdr_mru_hits, __entry->hdr_mru_ghost_hits,
	__entry->hdr_mfu_hits, __entry->hdr_mfu_ghost_hits,
	__entry->hdr_l2_hits, __entry->hdr_refcount,
	__entry->bp_dva0[0], __entry->bp_dva0[1],
	__entry->bp_dva1[0], __entry->bp_dva1[1],
	__entry->bp_dva2[0], __entry->bp_dva2[1],
	__entry->bp_cksum[0], __entry->bp_cksum[1],
	__entry->bp_cksum[2], __entry->bp_cksum[3],
	__entry->bp_lsize, __entry->zb_objset, __entry->zb_object,
	__entry->zb_level, __entry->zb_blkid)
	);
	/* END CSTYLED */

	/* BEGIN CSTYLED */
	#define DEFINE_ARC_MISS_EVENT(name) \
	DEFINE_EVENT(zfs_arc_miss_class, name, \
	TP_PROTO(arc_buf_hdr_t *hdr, \
	const blkptr_t bp, uint64_t size, const zbookmark_phys_t zb), \
	TP_ARGS(hdr, bp, size, zb))
	/* END CSTYLED */
	DEFINE_ARC_MISS_EVENT(zfs_arc__miss);

	/*
	* Generic support for four argument tracepoints of the form:
	*
	* DTRACE_PROBE4(...,
	* l2arc_dev_t *, ...,
	* list_t *, ...,
	* uint64_t, ...,
	* boolean_t, ...);
	*/
	/* BEGIN CSTYLED */
	DECLARE_EVENT_CLASS(zfs_l2arc_evict_class,
	TP_PROTO(l2arc_dev_t *dev,
	list_t *buflist, uint64_t taddr, boolean_t all),
	TP_ARGS(dev, buflist, taddr, all),
	TP_STRUCT__entry(
	__field(uint64_t, vdev_id)
	__field(uint64_t, vdev_guid)
	__field(uint64_t, vdev_state)

	__field(uint64_t, l2ad_hand)
	__field(uint64_t, l2ad_start)
	__field(uint64_t, l2ad_end)
	__field(boolean_t, l2ad_first)
	__field(boolean_t, l2ad_writing)

	__field(uint64_t, taddr)
	__field(boolean_t, all)
	),
	TP_fast_assign(
	__entry->vdev_id = dev->l2ad_vdev->vdev_id;
	__entry->vdev_guid = dev->l2ad_vdev->vdev_guid;
	__entry->vdev_state = dev->l2ad_vdev->vdev_state;

	__entry->l2ad_hand = dev->l2ad_hand;
	__entry->l2ad_start = dev->l2ad_start;
	__entry->l2ad_end = dev->l2ad_end;
	__entry->l2ad_first = dev->l2ad_first;
	__entry->l2ad_writing = dev->l2ad_writing;

	__entry->taddr = taddr;
	__entry->all = all;
	),
	TP_printk("l2ad { vdev { id %llu guid %llu state %llu } "
	"hand %llu start %llu end %llu "
	"first %d writing %d } taddr %llu all %d",
	__entry->vdev_id, __entry->vdev_guid, __entry->vdev_state,
	__entry->l2ad_hand, __entry->l2ad_start,
	__entry->l2ad_end, __entry->l2ad_first, __entry->l2ad_writing,
	__entry->taddr, __entry->all)
	);
	/* END CSTYLED */

	/* BEGIN CSTYLED */
	#define DEFINE_L2ARC_EVICT_EVENT(name) \
	DEFINE_EVENT(zfs_l2arc_evict_class, name, \
	TP_PROTO(l2arc_dev_t *dev, \
	list_t *buflist, uint64_t taddr, boolean_t all), \
	TP_ARGS(dev, buflist, taddr, all))
	/* END CSTYLED */
	DEFINE_L2ARC_EVICT_EVENT(zfs_l2arc__evict);

	/*
	* Generic support for three argument tracepoints of the form:
	*
	* DTRACE_PROBE3(...,
	* uint64_t, ...,
	* uint64_t, ...,
	* uint64_t, ...);
	*/
	/* BEGIN CSTYLED */
	DECLARE_EVENT_CLASS(zfs_arc_wait_for_eviction_class,
	TP_PROTO(uint64_t amount, uint64_t arc_evict_count, uint64_t aew_count),
	TP_ARGS(amount, arc_evict_count, aew_count),
	TP_STRUCT__entry(
	__field(uint64_t, amount)
	__field(uint64_t, arc_evict_count)
	__field(uint64_t, aew_count)
	),
	TP_fast_assign(
	__entry->amount = amount;
	__entry->arc_evict_count = arc_evict_count;
	__entry->aew_count = aew_count;
	),
	TP_printk("amount %llu arc_evict_count %llu aew_count %llu",
	__entry->amount, __entry->arc_evict_count, __entry->aew_count)
	);
	/* END CSTYLED */

	/* BEGIN CSTYLED */
	#define DEFINE_ARC_WAIT_FOR_EVICTION_EVENT(name) \
	DEFINE_EVENT(zfs_arc_wait_for_eviction_class, name, \
	TP_PROTO(uint64_t amount, uint64_t arc_evict_count, uint64_t aew_count), \
	TP_ARGS(amount, arc_evict_count, aew_count))
	/* END CSTYLED */
	DEFINE_ARC_WAIT_FOR_EVICTION_EVENT(zfs_arc__wait__for__eviction);

	#endif /* _TRACE_ARC_H */

	#undef TRACE_INCLUDE_PATH
	#undef TRACE_INCLUDE_FILE
	#define TRACE_INCLUDE_PATH sys
	#define TRACE_INCLUDE_FILE trace_arc
	#include <trace/define_trace.h>

	#else

	DEFINE_DTRACE_PROBE1(arc__hit);
	DEFINE_DTRACE_PROBE1(arc__evict);
	DEFINE_DTRACE_PROBE1(arc__delete);
	DEFINE_DTRACE_PROBE1(new_state__mru);
	DEFINE_DTRACE_PROBE1(new_state__mfu);
	DEFINE_DTRACE_PROBE1(arc__async__upgrade__sync);
	DEFINE_DTRACE_PROBE1(arc__demand__hit__predictive__prefetch);
	DEFINE_DTRACE_PROBE1(l2arc__hit);
	DEFINE_DTRACE_PROBE1(l2arc__miss);
	DEFINE_DTRACE_PROBE2(l2arc__read);
	DEFINE_DTRACE_PROBE2(l2arc__write);
	DEFINE_DTRACE_PROBE2(l2arc__iodone);
	DEFINE_DTRACE_PROBE3(arc__wait__for__eviction);
	DEFINE_DTRACE_PROBE4(arc__miss);
	DEFINE_DTRACE_PROBE4(l2arc__evict);

	#endif /* HAVE_DECLARE_EVENT_CLASS */
	#endif /* _KERNEL */
	diff --git a/sys/contrib/openzfs/include/os/linux/zfs/sys/zfs_znode_impl.h b/sys/contrib/openzfs/include/os/linux/zfs/sys/zfs_znode_impl.h
	index be211c5b51da..0a6273442b71 100644
	--- a/sys/contrib/openzfs/include/os/linux/zfs/sys/zfs_znode_impl.h
	+++ b/sys/contrib/openzfs/include/os/linux/zfs/sys/zfs_znode_impl.h
	@@ -1,182 +1,182 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	* Copyright 2016 Nexenta Systems, Inc. All rights reserved.
	*/

	#ifndef _SYS_ZFS_ZNODE_IMPL_H
	#define _SYS_ZFS_ZNODE_IMPL_H

	#ifndef _KERNEL
	#error "no user serviceable parts within"
	#endif

	#include <sys/isa_defs.h>
	#include <sys/types32.h>
	#include <sys/list.h>
	#include <sys/dmu.h>
	#include <sys/sa.h>
	+#include <sys/time.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/rrwlock.h>
	#include <sys/zfs_sa.h>
	#include <sys/zfs_stat.h>
	#include <sys/zfs_rlock.h>

	-
	#ifdef __cplusplus
	extern "C" {
	#endif

	#define ZNODE_OS_FIELDS \
	+ inode_timespec_t z_btime; /* creation/birth time (cached) */ \
	struct inode z_inode;

	-
	/*
	* Convert between znode pointers and inode pointers
	*/
	#define ZTOI(znode) (&((znode)->z_inode))
	#define ITOZ(inode) (container_of((inode), znode_t, z_inode))
	#define ZTOZSB(znode) ((zfsvfs_t *)(ZTOI(znode)->i_sb->s_fs_info))
	#define ITOZSB(inode) ((zfsvfs_t *)((inode)->i_sb->s_fs_info))

	#define ZTOTYPE(zp) (ZTOI(zp)->i_mode)
	#define ZTOGID(zp) (ZTOI(zp)->i_gid)
	#define ZTOUID(zp) (ZTOI(zp)->i_uid)
	#define ZTONLNK(zp) (ZTOI(zp)->i_nlink)

	#define Z_ISBLK(type) S_ISBLK(type)
	#define Z_ISCHR(type) S_ISCHR(type)
	#define Z_ISLNK(type) S_ISLNK(type)
	#define Z_ISDEV(type) (S_ISCHR(type) \|\| S_ISBLK(type) \|\| S_ISFIFO(type))
	#define Z_ISDIR(type) S_ISDIR(type)

	#define zn_has_cached_data(zp) ((zp)->z_is_mapped)
	#define zn_rlimit_fsize(zp, uio) (0)

	/*
	* zhold() wraps igrab() on Linux, and igrab() may fail when the
	* inode is in the process of being deleted. As zhold() must only be
	* called when a ref already exists - so the inode cannot be
	* mid-deletion - we VERIFY() this.
	*/
	#define zhold(zp) VERIFY3P(igrab(ZTOI((zp))), !=, NULL)
	#define zrele(zp) iput(ZTOI((zp)))

	/* Called on entry to each ZFS inode and vfs operation. */
	#define ZFS_ENTER_ERROR(zfsvfs, error) \
	do { \
	ZFS_TEARDOWN_ENTER_READ(zfsvfs, FTAG); \
	if (unlikely((zfsvfs)->z_unmounted)) { \
	ZFS_TEARDOWN_EXIT_READ(zfsvfs, FTAG); \
	return (error); \
	} \
	} while (0)
	#define ZFS_ENTER(zfsvfs) ZFS_ENTER_ERROR(zfsvfs, EIO)
	#define ZPL_ENTER(zfsvfs) ZFS_ENTER_ERROR(zfsvfs, -EIO)

	/* Must be called before exiting the operation. */
	#define ZFS_EXIT(zfsvfs) \
	do { \
	zfs_exit_fs(zfsvfs); \
	ZFS_TEARDOWN_EXIT_READ(zfsvfs, FTAG); \
	} while (0)

	#define ZPL_EXIT(zfsvfs) \
	do { \
	rrm_exit(&(zfsvfs)->z_teardown_lock, FTAG); \
	} while (0)

	/* Verifies the znode is valid. */
	#define ZFS_VERIFY_ZP_ERROR(zp, error) \
	do { \
	if (unlikely((zp)->z_sa_hdl == NULL)) { \
	ZFS_EXIT(ZTOZSB(zp)); \
	return (error); \
	} \
	} while (0)
	#define ZFS_VERIFY_ZP(zp) ZFS_VERIFY_ZP_ERROR(zp, EIO)
	#define ZPL_VERIFY_ZP(zp) ZFS_VERIFY_ZP_ERROR(zp, -EIO)

	/*
	* Macros for dealing with dmu_buf_hold
	*/
	#define ZFS_OBJ_MTX_SZ 64
	#define ZFS_OBJ_MTX_MAX (1024 * 1024)
	#define ZFS_OBJ_HASH(zfsvfs, obj) ((obj) & ((zfsvfs->z_hold_size) - 1))

	extern unsigned int zfs_object_mutex_size;

	/*
	* Encode ZFS stored time values from a struct timespec / struct timespec64.
	*/
	#define ZFS_TIME_ENCODE(tp, stmp) \
	do { \
	(stmp)[0] = (uint64_t)(tp)->tv_sec; \
	(stmp)[1] = (uint64_t)(tp)->tv_nsec; \
	} while (0)

	#if defined(HAVE_INODE_TIMESPEC64_TIMES)
	/*
	* Decode ZFS stored time values to a struct timespec64
	* 4.18 and newer kernels.
	*/
	#define ZFS_TIME_DECODE(tp, stmp) \
	do { \
	(tp)->tv_sec = (time64_t)(stmp)[0]; \
	(tp)->tv_nsec = (long)(stmp)[1]; \
	} while (0)
	#else
	/*
	* Decode ZFS stored time values to a struct timespec
	* 4.17 and older kernels.
	*/
	#define ZFS_TIME_DECODE(tp, stmp) \
	do { \
	(tp)->tv_sec = (time_t)(stmp)[0]; \
	(tp)->tv_nsec = (long)(stmp)[1]; \
	} while (0)
	#endif /* HAVE_INODE_TIMESPEC64_TIMES */

	#define ZFS_ACCESSTIME_STAMP(zfsvfs, zp)

	struct znode;

	extern int zfs_sync(struct super_block , int, cred_t );
	extern int zfs_inode_alloc(struct super_block , struct inode *ip);
	extern void zfs_inode_destroy(struct inode *);
	extern void zfs_mark_inode_dirty(struct inode *);
	extern boolean_t zfs_relatime_need_update(const struct inode *);

	#if defined(HAVE_UIO_RW)
	extern caddr_t zfs_map_page(page_t *, enum seg_rw);
	extern void zfs_unmap_page(page_t *, caddr_t);
	#endif /* HAVE_UIO_RW */

	extern zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE];
	extern int zfsfstype;

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_ZFS_ZNODE_IMPL_H */
	diff --git a/sys/contrib/openzfs/include/os/linux/zfs/sys/zpl.h b/sys/contrib/openzfs/include/os/linux/zfs/sys/zpl.h
	index 54f3fa0fdb0f..ff86e027bbe2 100644
	--- a/sys/contrib/openzfs/include/os/linux/zfs/sys/zpl.h
	+++ b/sys/contrib/openzfs/include/os/linux/zfs/sys/zpl.h
	@@ -1,197 +1,201 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
	*/

	#ifndef _SYS_ZPL_H
	#define _SYS_ZPL_H

	#include <sys/mntent.h>
	#include <sys/vfs.h>
	#include <linux/aio.h>
	#include <linux/dcache_compat.h>
	#include <linux/exportfs.h>
	#include <linux/falloc.h>
	#include <linux/parser.h>
	#include <linux/task_io_accounting_ops.h>
	#include <linux/vfs_compat.h>
	#include <linux/writeback.h>
	#include <linux/xattr_compat.h>

	/* zpl_inode.c */
	extern void zpl_vap_init(vattr_t vap, struct inode dir,
	umode_t mode, cred_t *cr);

	extern const struct inode_operations zpl_inode_operations;
	extern const struct inode_operations zpl_dir_inode_operations;
	extern const struct inode_operations zpl_symlink_inode_operations;
	extern const struct inode_operations zpl_special_inode_operations;
	extern dentry_operations_t zpl_dentry_operations;
	extern const struct address_space_operations zpl_address_space_operations;
	extern const struct file_operations zpl_file_operations;
	extern const struct file_operations zpl_dir_file_operations;

	/* zpl_super.c */
	extern void zpl_prune_sb(int64_t nr_to_scan, void *arg);

	extern const struct super_operations zpl_super_operations;
	extern const struct export_operations zpl_export_operations;
	extern struct file_system_type zpl_fs_type;

	/* zpl_xattr.c */
	extern ssize_t zpl_xattr_list(struct dentry dentry, char buf, size_t size);
	extern int zpl_xattr_security_init(struct inode ip, struct inode dip,
	const struct qstr *qstr);
	#if defined(CONFIG_FS_POSIX_ACL)
	#if defined(HAVE_SET_ACL)
	#if defined(HAVE_SET_ACL_USERNS)
	extern int zpl_set_acl(struct user_namespace userns, struct inode ip,
	struct posix_acl *acl, int type);
	#else
	extern int zpl_set_acl(struct inode ip, struct posix_acl acl, int type);
	#endif /* HAVE_SET_ACL_USERNS */
	#endif /* HAVE_SET_ACL */
	+#if defined(HAVE_GET_ACL_RCU)
	+extern struct posix_acl zpl_get_acl(struct inode ip, int type, bool rcu);
	+#elif defined(HAVE_GET_ACL)
	extern struct posix_acl zpl_get_acl(struct inode ip, int type);
	+#endif
	extern int zpl_init_acl(struct inode ip, struct inode dir);
	extern int zpl_chmod_acl(struct inode *ip);
	#else
	static inline int
	zpl_init_acl(struct inode ip, struct inode dir)
	{
	return (0);
	}

	static inline int
	zpl_chmod_acl(struct inode *ip)
	{
	return (0);
	}
	#endif /* CONFIG_FS_POSIX_ACL */

	extern xattr_handler_t *zpl_xattr_handlers[];

	/* zpl_ctldir.c */
	extern const struct file_operations zpl_fops_root;
	extern const struct inode_operations zpl_ops_root;

	extern const struct file_operations zpl_fops_snapdir;
	extern const struct inode_operations zpl_ops_snapdir;
	extern const struct dentry_operations zpl_dops_snapdirs;

	extern const struct file_operations zpl_fops_shares;
	extern const struct inode_operations zpl_ops_shares;

	#if defined(HAVE_VFS_ITERATE) \|\| defined(HAVE_VFS_ITERATE_SHARED)

	#define ZPL_DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
	.actor = _actor, \
	.pos = _pos, \
	}

	typedef struct dir_context zpl_dir_context_t;

	#define zpl_dir_emit dir_emit
	#define zpl_dir_emit_dot dir_emit_dot
	#define zpl_dir_emit_dotdot dir_emit_dotdot
	#define zpl_dir_emit_dots dir_emit_dots

	#else

	typedef struct zpl_dir_context {
	void *dirent;
	const filldir_t actor;
	loff_t pos;
	} zpl_dir_context_t;

	#define ZPL_DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
	.dirent = _dirent, \
	.actor = _actor, \
	.pos = _pos, \
	}

	static inline bool
	zpl_dir_emit(zpl_dir_context_t ctx, const char name, int namelen,
	uint64_t ino, unsigned type)
	{
	return (!ctx->actor(ctx->dirent, name, namelen, ctx->pos, ino, type));
	}

	static inline bool
	zpl_dir_emit_dot(struct file file, zpl_dir_context_t ctx)
	{
	return (ctx->actor(ctx->dirent, ".", 1, ctx->pos,
	file_inode(file)->i_ino, DT_DIR) == 0);
	}

	static inline bool
	zpl_dir_emit_dotdot(struct file file, zpl_dir_context_t ctx)
	{
	return (ctx->actor(ctx->dirent, "..", 2, ctx->pos,
	parent_ino(file_dentry(file)), DT_DIR) == 0);
	}

	static inline bool
	zpl_dir_emit_dots(struct file file, zpl_dir_context_t ctx)
	{
	if (ctx->pos == 0) {
	if (!zpl_dir_emit_dot(file, ctx))
	return (false);
	ctx->pos = 1;
	}
	if (ctx->pos == 1) {
	if (!zpl_dir_emit_dotdot(file, ctx))
	return (false);
	ctx->pos = 2;
	}
	return (true);
	}
	#endif /* HAVE_VFS_ITERATE */

	#if defined(HAVE_INODE_TIMESTAMP_TRUNCATE)
	#define zpl_inode_timestamp_truncate(ts, ip) timestamp_truncate(ts, ip)
	#elif defined(HAVE_INODE_TIMESPEC64_TIMES)
	#define zpl_inode_timestamp_truncate(ts, ip) \
	timespec64_trunc(ts, (ip)->i_sb->s_time_gran)
	#else
	#define zpl_inode_timestamp_truncate(ts, ip) \
	timespec_trunc(ts, (ip)->i_sb->s_time_gran)
	#endif

	#if defined(HAVE_INODE_OWNER_OR_CAPABLE)
	#define zpl_inode_owner_or_capable(ns, ip) inode_owner_or_capable(ip)
	#elif defined(HAVE_INODE_OWNER_OR_CAPABLE_IDMAPPED)
	#define zpl_inode_owner_or_capable(ns, ip) inode_owner_or_capable(ns, ip)
	#else
	#error "Unsupported kernel"
	#endif

	#ifdef HAVE_SETATTR_PREPARE_USERNS
	#define zpl_setattr_prepare(ns, dentry, ia) setattr_prepare(ns, dentry, ia)
	#else
	/*
	* Use kernel-provided version, or our own from
	* linux/vfs_compat.h
	*/
	#define zpl_setattr_prepare(ns, dentry, ia) setattr_prepare(dentry, ia)
	#endif

	#endif /* _SYS_ZPL_H */
	diff --git a/sys/contrib/openzfs/include/sys/abd.h b/sys/contrib/openzfs/include/sys/abd.h
	index a7eee89ca916..6903e0c0e713 100644
	--- a/sys/contrib/openzfs/include/sys/abd.h
	+++ b/sys/contrib/openzfs/include/sys/abd.h
	@@ -1,221 +1,220 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
	* Copyright (c) 2016, 2019 by Delphix. All rights reserved.
	*/

	#ifndef _ABD_H
	#define _ABD_H

	#include <sys/isa_defs.h>
	#include <sys/debug.h>
	#include <sys/zfs_refcount.h>
	#include <sys/uio.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	typedef enum abd_flags {
	ABD_FLAG_LINEAR = 1 << 0, /* is buffer linear (or scattered)? */
	ABD_FLAG_OWNER = 1 << 1, /* does it own its data buffers? */
	ABD_FLAG_META = 1 << 2, /* does this represent FS metadata? */
	ABD_FLAG_MULTI_ZONE = 1 << 3, /* pages split over memory zones */
	ABD_FLAG_MULTI_CHUNK = 1 << 4, /* pages split over multiple chunks */
	ABD_FLAG_LINEAR_PAGE = 1 << 5, /* linear but allocd from page */
	ABD_FLAG_GANG = 1 << 6, /* mult ABDs chained together */
	ABD_FLAG_GANG_FREE = 1 << 7, /* gang ABD is responsible for mem */
	ABD_FLAG_ZEROS = 1 << 8, /* ABD for zero-filled buffer */
	ABD_FLAG_ALLOCD = 1 << 9, /* we allocated the abd_t */
	} abd_flags_t;

	typedef struct abd {
	abd_flags_t abd_flags;
	uint_t abd_size; /* excludes scattered abd_offset */
	list_node_t abd_gang_link;
	#ifdef ZFS_DEBUG
	struct abd *abd_parent;
	zfs_refcount_t abd_children;
	#endif
	kmutex_t abd_mtx;
	union {
	struct abd_scatter {
	uint_t abd_offset;
	#if defined(__FreeBSD__) && defined(_KERNEL)
	- uint_t abd_chunk_size;
	void abd_chunks[1]; / actually variable-length */
	#else
	uint_t abd_nents;
	struct scatterlist *abd_sgl;
	#endif
	} abd_scatter;
	struct abd_linear {
	void *abd_buf;
	struct scatterlist abd_sgl; / for LINEAR_PAGE */
	} abd_linear;
	struct abd_gang {
	list_t abd_gang_chain;
	} abd_gang;
	} abd_u;
	} abd_t;

	typedef int abd_iter_func_t(void buf, size_t len, void priv);
	typedef int abd_iter_func2_t(void bufa, void bufb, size_t len, void *priv);

	extern int zfs_abd_scatter_enabled;

	/*
	* Allocations and deallocations
	*/

	abd_t *abd_alloc(size_t, boolean_t);
	abd_t *abd_alloc_linear(size_t, boolean_t);
	abd_t *abd_alloc_gang(void);
	abd_t *abd_alloc_for_io(size_t, boolean_t);
	abd_t abd_alloc_sametype(abd_t , size_t);
	void abd_gang_add(abd_t , abd_t , boolean_t);
	void abd_free(abd_t *);
	abd_t abd_get_offset(abd_t , size_t);
	abd_t abd_get_offset_size(abd_t , size_t, size_t);
	abd_t abd_get_offset_struct(abd_t , abd_t *, size_t, size_t);
	abd_t *abd_get_zeros(size_t);
	abd_t abd_get_from_buf(void , size_t);
	void abd_cache_reap_now(void);

	/*
	* Conversion to and from a normal buffer
	*/

	void abd_to_buf(abd_t );
	void abd_borrow_buf(abd_t , size_t);
	void abd_borrow_buf_copy(abd_t , size_t);
	void abd_return_buf(abd_t , void , size_t);
	void abd_return_buf_copy(abd_t , void , size_t);
	void abd_take_ownership_of_buf(abd_t *, boolean_t);
	void abd_release_ownership_of_buf(abd_t *);

	/*
	* ABD operations
	*/

	int abd_iterate_func(abd_t , size_t, size_t, abd_iter_func_t , void *);
	int abd_iterate_func2(abd_t , abd_t , size_t, size_t, size_t,
	abd_iter_func2_t , void );
	void abd_copy_off(abd_t , abd_t , size_t, size_t, size_t);
	void abd_copy_from_buf_off(abd_t , const void , size_t, size_t);
	void abd_copy_to_buf_off(void , abd_t , size_t, size_t);
	int abd_cmp(abd_t , abd_t );
	int abd_cmp_buf_off(abd_t , const void , size_t, size_t);
	void abd_zero_off(abd_t *, size_t, size_t);
	void abd_verify(abd_t *);

	void abd_raidz_gen_iterate(abd_t *cabds, abd_t dabd,
	ssize_t csize, ssize_t dsize, const unsigned parity,
	void (func_raidz_gen)(void , const void , size_t, size_t));
	void abd_raidz_rec_iterate(abd_t cabds, abd_t tabds,
	ssize_t tsize, const unsigned parity,
	void (func_raidz_rec)(void t, const size_t tsize, void *c,
	const unsigned *mul),
	const unsigned *mul);

	/*
	* Wrappers for calls with offsets of 0
	*/

	static inline void
	abd_copy(abd_t dabd, abd_t sabd, size_t size)
	{
	abd_copy_off(dabd, sabd, 0, 0, size);
	}

	static inline void
	abd_copy_from_buf(abd_t abd, const void buf, size_t size)
	{
	abd_copy_from_buf_off(abd, buf, 0, size);
	}

	static inline void
	abd_copy_to_buf(void* buf, abd_t *abd, size_t size)
	{
	abd_copy_to_buf_off(buf, abd, 0, size);
	}

	static inline int
	abd_cmp_buf(abd_t abd, const void buf, size_t size)
	{
	return (abd_cmp_buf_off(abd, buf, 0, size));
	}

	static inline void
	abd_zero(abd_t *abd, size_t size)
	{
	abd_zero_off(abd, 0, size);
	}

	/*
	* ABD type check functions
	*/
	static inline boolean_t
	abd_is_linear(abd_t *abd)
	{
	return ((abd->abd_flags & ABD_FLAG_LINEAR) ? B_TRUE : B_FALSE);
	}

	static inline boolean_t
	abd_is_linear_page(abd_t *abd)
	{
	return ((abd->abd_flags & ABD_FLAG_LINEAR_PAGE) ? B_TRUE : B_FALSE);
	}

	static inline boolean_t
	abd_is_gang(abd_t *abd)
	{
	return ((abd->abd_flags & ABD_FLAG_GANG) ? B_TRUE : B_FALSE);
	}

	static inline uint_t
	abd_get_size(abd_t *abd)
	{
	return (abd->abd_size);
	}

	/*
	* Module lifecycle
	* Defined in each specific OS's abd_os.c
	*/

	void abd_init(void);
	void abd_fini(void);

	/*
	* Linux ABD bio functions
	*/
	#if defined(__linux__) && defined(_KERNEL)
	unsigned int abd_bio_map_off(struct bio , abd_t , unsigned int, size_t);
	unsigned long abd_nr_pages_off(abd_t *, unsigned int, size_t);
	#endif

	#ifdef __cplusplus
	}
	#endif

	#endif /* _ABD_H */
	diff --git a/sys/contrib/openzfs/include/sys/abd_impl.h b/sys/contrib/openzfs/include/sys/abd_impl.h
	index 6bce08cfa343..113700cd72b1 100644
	--- a/sys/contrib/openzfs/include/sys/abd_impl.h
	+++ b/sys/contrib/openzfs/include/sys/abd_impl.h
	@@ -1,112 +1,112 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
	* Copyright (c) 2016, 2019 by Delphix. All rights reserved.
	*/

	#ifndef _ABD_IMPL_H
	#define _ABD_IMPL_H

	#include <sys/abd.h>
	#include <sys/wmsum.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	typedef enum abd_stats_op {
	ABDSTAT_INCR, /* Increase abdstat values */
	ABDSTAT_DECR /* Decrease abdstat values */
	} abd_stats_op_t;

	struct scatterlist; /* forward declaration */

	struct abd_iter {
	/* public interface */
	void iter_mapaddr; / addr corresponding to iter_pos */
	size_t iter_mapsize; /* length of data valid at mapaddr */

	/* private */
	abd_t iter_abd; / ABD being iterated through */
	size_t iter_pos;
	size_t iter_offset; /* offset in current sg/abd_buf, */
	/* abd_offset included */
	struct scatterlist iter_sg; / current sg */
	};

	extern abd_t *abd_zero_scatter;

	abd_t abd_gang_get_offset(abd_t , size_t *);
	abd_t *abd_alloc_struct(size_t);
	void abd_free_struct(abd_t *);

	/*
	* OS specific functions
	*/

	abd_t *abd_alloc_struct_impl(size_t);
	-abd_t abd_get_offset_scatter(abd_t , abd_t *, size_t);
	+abd_t abd_get_offset_scatter(abd_t , abd_t *, size_t, size_t);
	void abd_free_struct_impl(abd_t *);
	void abd_alloc_chunks(abd_t *, size_t);
	void abd_free_chunks(abd_t *);
	boolean_t abd_size_alloc_linear(size_t);
	void abd_update_scatter_stats(abd_t *, abd_stats_op_t);
	void abd_update_linear_stats(abd_t *, abd_stats_op_t);
	void abd_verify_scatter(abd_t *);
	void abd_free_linear_page(abd_t *);
	/* OS specific abd_iter functions */
	void abd_iter_init(struct abd_iter , abd_t );
	boolean_t abd_iter_at_end(struct abd_iter *);
	void abd_iter_advance(struct abd_iter *, size_t);
	void abd_iter_map(struct abd_iter *);
	void abd_iter_unmap(struct abd_iter *);

	/*
	* Helper macros
	*/
	#define ABDSTAT_INCR(stat, val) \
	wmsum_add(&abd_sums.stat, (val))
	#define ABDSTAT_BUMP(stat) ABDSTAT_INCR(stat, 1)
	#define ABDSTAT_BUMPDOWN(stat) ABDSTAT_INCR(stat, -1)

	#define ABD_SCATTER(abd) (abd->abd_u.abd_scatter)
	#define ABD_LINEAR_BUF(abd) (abd->abd_u.abd_linear.abd_buf)
	#define ABD_GANG(abd) (abd->abd_u.abd_gang)

	#if defined(_KERNEL)
	#if defined(__FreeBSD__)
	#define abd_enter_critical(flags) critical_enter()
	#define abd_exit_critical(flags) critical_exit()
	#else
	#define abd_enter_critical(flags) local_irq_save(flags)
	#define abd_exit_critical(flags) local_irq_restore(flags)
	#endif
	#else /* !_KERNEL */
	#define abd_enter_critical(flags) ((void)0)
	#define abd_exit_critical(flags) ((void)0)
	#endif

	#ifdef __cplusplus
	}
	#endif

	#endif /* _ABD_IMPL_H */
	diff --git a/sys/contrib/openzfs/include/sys/arc.h b/sys/contrib/openzfs/include/sys/arc.h
	index f58fa53b6003..a3241f3685a6 100644
	--- a/sys/contrib/openzfs/include/sys/arc.h
	+++ b/sys/contrib/openzfs/include/sys/arc.h
	@@ -1,341 +1,348 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
	* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	* Copyright (c) 2019, Allan Jude
	* Copyright (c) 2019, Klara Inc.
	*/

	#ifndef _SYS_ARC_H
	#define _SYS_ARC_H

	#include <sys/zfs_context.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	#include <sys/zio.h>
	#include <sys/dmu.h>
	#include <sys/spa.h>
	#include <sys/zfs_refcount.h>

	/*
	* Used by arc_flush() to inform arc_evict_state() that it should evict
	* all available buffers from the arc state being passed in.
	*/
	-#define ARC_EVICT_ALL -1ULL
	+#define ARC_EVICT_ALL UINT64_MAX
	+
	+/*
	+ * ZFS gets very unhappy when the maximum ARC size is smaller than the maximum
	+ * block size and a larger block is written. To leave some safety margin, we
	+ * limit the minimum for zfs_arc_max to the maximium transaction size.
	+ */
	+#define MIN_ARC_MAX DMU_MAX_ACCESS

	#define HDR_SET_LSIZE(hdr, x) do { \
	ASSERT(IS_P2ALIGNED(x, 1U << SPA_MINBLOCKSHIFT)); \
	(hdr)->b_lsize = ((x) >> SPA_MINBLOCKSHIFT); \
	_NOTE(CONSTCOND) } while (0)

	#define HDR_SET_PSIZE(hdr, x) do { \
	ASSERT(IS_P2ALIGNED((x), 1U << SPA_MINBLOCKSHIFT)); \
	(hdr)->b_psize = ((x) >> SPA_MINBLOCKSHIFT); \
	_NOTE(CONSTCOND) } while (0)

	#define HDR_GET_LSIZE(hdr) ((hdr)->b_lsize << SPA_MINBLOCKSHIFT)
	#define HDR_GET_PSIZE(hdr) ((hdr)->b_psize << SPA_MINBLOCKSHIFT)

	typedef struct arc_buf_hdr arc_buf_hdr_t;
	typedef struct arc_buf arc_buf_t;
	typedef struct arc_prune arc_prune_t;

	/*
	* Because the ARC can store encrypted data, errors (not due to bugs) may arise
	* while transforming data into its desired format - specifically, when
	* decrypting, the key may not be present, or the HMAC may not be correct
	* which signifies deliberate tampering with the on-disk state
	* (assuming that the checksum was correct). If any error occurs, the "buf"
	* parameter will be NULL.
	*/
	typedef void arc_read_done_func_t(zio_t zio, const zbookmark_phys_t zb,
	const blkptr_t bp, arc_buf_t buf, void *priv);
	typedef void arc_write_done_func_t(zio_t zio, arc_buf_t buf, void *priv);
	typedef void arc_prune_func_t(int64_t bytes, void *priv);

	/* Shared module parameters */
	extern int zfs_arc_average_blocksize;

	/* generic arc_done_func_t's which you can use */
	arc_read_done_func_t arc_bcopy_func;
	arc_read_done_func_t arc_getbuf_func;

	/* generic arc_prune_func_t wrapper for callbacks */
	struct arc_prune {
	arc_prune_func_t *p_pfunc;
	void *p_private;
	uint64_t p_adjust;
	list_node_t p_node;
	zfs_refcount_t p_refcnt;
	};

	typedef enum arc_strategy {
	ARC_STRATEGY_META_ONLY = 0, /* Evict only meta data buffers */
	ARC_STRATEGY_META_BALANCED = 1, /* Evict data buffers if needed */
	} arc_strategy_t;

	typedef enum arc_flags
	{
	/*
	* Public flags that can be passed into the ARC by external consumers.
	*/
	ARC_FLAG_WAIT = 1 << 0, /* perform sync I/O */
	ARC_FLAG_NOWAIT = 1 << 1, /* perform async I/O */
	ARC_FLAG_PREFETCH = 1 << 2, /* I/O is a prefetch */
	ARC_FLAG_CACHED = 1 << 3, /* I/O was in cache */
	ARC_FLAG_L2CACHE = 1 << 4, /* cache in L2ARC */
	ARC_FLAG_PREDICTIVE_PREFETCH = 1 << 5, /* I/O from zfetch */
	ARC_FLAG_PRESCIENT_PREFETCH = 1 << 6, /* long min lifespan */

	/*
	* Private ARC flags. These flags are private ARC only flags that
	* will show up in b_flags in the arc_hdr_buf_t. These flags should
	* only be set by ARC code.
	*/
	ARC_FLAG_IN_HASH_TABLE = 1 << 7, /* buffer is hashed */
	ARC_FLAG_IO_IN_PROGRESS = 1 << 8, /* I/O in progress */
	ARC_FLAG_IO_ERROR = 1 << 9, /* I/O failed for buf */
	ARC_FLAG_INDIRECT = 1 << 10, /* indirect block */
	/* Indicates that block was read with ASYNC priority. */
	ARC_FLAG_PRIO_ASYNC_READ = 1 << 11,
	ARC_FLAG_L2_WRITING = 1 << 12, /* write in progress */
	ARC_FLAG_L2_EVICTED = 1 << 13, /* evicted during I/O */
	ARC_FLAG_L2_WRITE_HEAD = 1 << 14, /* head of write list */
	/*
	* Encrypted or authenticated on disk (may be plaintext in memory).
	* This header has b_crypt_hdr allocated. Does not include indirect
	* blocks with checksums of MACs which will also have their X
	* (encrypted) bit set in the bp.
	*/
	ARC_FLAG_PROTECTED = 1 << 15,
	/* data has not been authenticated yet */
	ARC_FLAG_NOAUTH = 1 << 16,
	/* indicates that the buffer contains metadata (otherwise, data) */
	ARC_FLAG_BUFC_METADATA = 1 << 17,

	/* Flags specifying whether optional hdr struct fields are defined */
	ARC_FLAG_HAS_L1HDR = 1 << 18,
	ARC_FLAG_HAS_L2HDR = 1 << 19,

	/*
	* Indicates the arc_buf_hdr_t's b_pdata matches the on-disk data.
	* This allows the l2arc to use the blkptr's checksum to verify
	* the data without having to store the checksum in the hdr.
	*/
	ARC_FLAG_COMPRESSED_ARC = 1 << 20,
	ARC_FLAG_SHARED_DATA = 1 << 21,

	/*
	* Fail this arc_read() (with ENOENT) if the data is not already present
	* in cache.
	*/
	ARC_FLAG_CACHED_ONLY = 1 << 22,

	/*
	* Don't instantiate an arc_buf_t for arc_read_done.
	*/
	ARC_FLAG_NO_BUF = 1 << 23,

	/*
	* The arc buffer's compression mode is stored in the top 7 bits of the
	* flags field, so these dummy flags are included so that MDB can
	* interpret the enum properly.
	*/
	ARC_FLAG_COMPRESS_0 = 1 << 24,
	ARC_FLAG_COMPRESS_1 = 1 << 25,
	ARC_FLAG_COMPRESS_2 = 1 << 26,
	ARC_FLAG_COMPRESS_3 = 1 << 27,
	ARC_FLAG_COMPRESS_4 = 1 << 28,
	ARC_FLAG_COMPRESS_5 = 1 << 29,
	ARC_FLAG_COMPRESS_6 = 1 << 30

	} arc_flags_t;

	typedef enum arc_buf_flags {
	ARC_BUF_FLAG_SHARED = 1 << 0,
	ARC_BUF_FLAG_COMPRESSED = 1 << 1,
	/*
	* indicates whether this arc_buf_t is encrypted, regardless of
	* state on-disk
	*/
	ARC_BUF_FLAG_ENCRYPTED = 1 << 2
	} arc_buf_flags_t;

	struct arc_buf {
	arc_buf_hdr_t *b_hdr;
	arc_buf_t *b_next;
	kmutex_t b_evict_lock;
	void *b_data;
	arc_buf_flags_t b_flags;
	};

	typedef enum arc_buf_contents {
	ARC_BUFC_INVALID, /* invalid type */
	ARC_BUFC_DATA, /* buffer contains data */
	ARC_BUFC_METADATA, /* buffer contains metadata */
	ARC_BUFC_NUMTYPES
	} arc_buf_contents_t;

	/*
	* The following breakdowns of arc_size exist for kstat only.
	*/
	typedef enum arc_space_type {
	ARC_SPACE_DATA,
	ARC_SPACE_META,
	ARC_SPACE_HDRS,
	ARC_SPACE_L2HDRS,
	ARC_SPACE_DBUF,
	ARC_SPACE_DNODE,
	ARC_SPACE_BONUS,
	ARC_SPACE_ABD_CHUNK_WASTE,
	ARC_SPACE_NUMTYPES
	} arc_space_type_t;

	typedef enum arc_state_type {
	ARC_STATE_ANON,
	ARC_STATE_MRU,
	ARC_STATE_MRU_GHOST,
	ARC_STATE_MFU,
	ARC_STATE_MFU_GHOST,
	ARC_STATE_L2C_ONLY,
	ARC_STATE_NUMTYPES
	} arc_state_type_t;

	typedef struct arc_buf_info {
	arc_state_type_t abi_state_type;
	arc_buf_contents_t abi_state_contents;
	uint32_t abi_flags;
	uint32_t abi_bufcnt;
	uint64_t abi_size;
	uint64_t abi_spa;
	uint64_t abi_access;
	uint32_t abi_mru_hits;
	uint32_t abi_mru_ghost_hits;
	uint32_t abi_mfu_hits;
	uint32_t abi_mfu_ghost_hits;
	uint32_t abi_l2arc_hits;
	uint32_t abi_holds;
	uint64_t abi_l2arc_dattr;
	uint64_t abi_l2arc_asize;
	enum zio_compress abi_l2arc_compress;
	} arc_buf_info_t;

	void arc_space_consume(uint64_t space, arc_space_type_t type);
	void arc_space_return(uint64_t space, arc_space_type_t type);
	boolean_t arc_is_metadata(arc_buf_t *buf);
	boolean_t arc_is_encrypted(arc_buf_t *buf);
	boolean_t arc_is_unauthenticated(arc_buf_t *buf);
	enum zio_compress arc_get_compression(arc_buf_t *buf);
	void arc_get_raw_params(arc_buf_t buf, boolean_t byteorder, uint8_t *salt,
	uint8_t iv, uint8_t mac);
	int arc_untransform(arc_buf_t buf, spa_t spa, const zbookmark_phys_t *zb,
	boolean_t in_place);
	void arc_convert_to_raw(arc_buf_t *buf, uint64_t dsobj, boolean_t byteorder,
	dmu_object_type_t ot, const uint8_t salt, const uint8_t iv,
	const uint8_t *mac);
	arc_buf_t arc_alloc_buf(spa_t spa, void *tag, arc_buf_contents_t type,
	int32_t size);
	arc_buf_t arc_alloc_compressed_buf(spa_t spa, void *tag,
	uint64_t psize, uint64_t lsize, enum zio_compress compression_type,
	uint8_t complevel);
	arc_buf_t arc_alloc_raw_buf(spa_t spa, void *tag, uint64_t dsobj,
	boolean_t byteorder, const uint8_t salt, const uint8_t iv,
	const uint8_t *mac, dmu_object_type_t ot, uint64_t psize, uint64_t lsize,
	enum zio_compress compression_type, uint8_t complevel);
	uint8_t arc_get_complevel(arc_buf_t *buf);
	arc_buf_t arc_loan_buf(spa_t spa, boolean_t is_metadata, int size);
	arc_buf_t arc_loan_compressed_buf(spa_t spa, uint64_t psize, uint64_t lsize,
	enum zio_compress compression_type, uint8_t complevel);
	arc_buf_t arc_loan_raw_buf(spa_t spa, uint64_t dsobj, boolean_t byteorder,
	const uint8_t salt, const uint8_t iv, const uint8_t *mac,
	dmu_object_type_t ot, uint64_t psize, uint64_t lsize,
	enum zio_compress compression_type, uint8_t complevel);
	void arc_return_buf(arc_buf_t buf, void tag);
	void arc_loan_inuse_buf(arc_buf_t buf, void tag);
	void arc_buf_destroy(arc_buf_t buf, void tag);
	void arc_buf_info(arc_buf_t buf, arc_buf_info_t abi, int state_index);
	uint64_t arc_buf_size(arc_buf_t *buf);
	uint64_t arc_buf_lsize(arc_buf_t *buf);
	void arc_buf_access(arc_buf_t *buf);
	void arc_release(arc_buf_t buf, void tag);
	int arc_released(arc_buf_t *buf);
	void arc_buf_sigsegv(int sig, siginfo_t si, void unused);
	void arc_buf_freeze(arc_buf_t *buf);
	void arc_buf_thaw(arc_buf_t *buf);
	#ifdef ZFS_DEBUG
	int arc_referenced(arc_buf_t *buf);
	#endif

	int arc_read(zio_t pio, spa_t spa, const blkptr_t *bp,
	arc_read_done_func_t done, void priv, zio_priority_t priority,
	int flags, arc_flags_t arc_flags, const zbookmark_phys_t zb);
	zio_t arc_write(zio_t pio, spa_t *spa, uint64_t txg,
	blkptr_t bp, arc_buf_t buf, boolean_t l2arc, const zio_prop_t *zp,
	arc_write_done_func_t ready, arc_write_done_func_t child_ready,
	arc_write_done_func_t physdone, arc_write_done_func_t done,
	void *priv, zio_priority_t priority, int zio_flags,
	const zbookmark_phys_t *zb);

	arc_prune_t arc_add_prune_callback(arc_prune_func_t func, void *priv);
	void arc_remove_prune_callback(arc_prune_t *p);
	void arc_freed(spa_t spa, const blkptr_t bp);

	void arc_flush(spa_t *spa, boolean_t retry);
	void arc_tempreserve_clear(uint64_t reserve);
	int arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg);

	uint64_t arc_all_memory(void);
	uint64_t arc_default_max(uint64_t min, uint64_t allmem);
	uint64_t arc_target_bytes(void);
	void arc_set_limits(uint64_t);
	void arc_init(void);
	void arc_fini(void);

	/*
	* Level 2 ARC
	*/

	void l2arc_add_vdev(spa_t spa, vdev_t vd);
	void l2arc_remove_vdev(vdev_t *vd);
	boolean_t l2arc_vdev_present(vdev_t *vd);
	void l2arc_rebuild_vdev(vdev_t *vd, boolean_t reopen);
	boolean_t l2arc_range_check_overlap(uint64_t bottom, uint64_t top,
	uint64_t check);
	void l2arc_init(void);
	void l2arc_fini(void);
	void l2arc_start(void);
	void l2arc_stop(void);
	void l2arc_spa_rebuild_start(spa_t *spa);

	#ifndef _KERNEL
	extern boolean_t arc_watch;
	#endif

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_ARC_H */
	diff --git a/sys/contrib/openzfs/include/sys/arc_impl.h b/sys/contrib/openzfs/include/sys/arc_impl.h
	index 1f341ec94faf..43818d4104c4 100644
	--- a/sys/contrib/openzfs/include/sys/arc_impl.h
	+++ b/sys/contrib/openzfs/include/sys/arc_impl.h
	@@ -1,1015 +1,1021 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2013, Delphix. All rights reserved.
	* Copyright (c) 2013, Saso Kiselkov. All rights reserved.
	* Copyright (c) 2013, Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2020, George Amanakis. All rights reserved.
	*/

	#ifndef _SYS_ARC_IMPL_H
	#define _SYS_ARC_IMPL_H

	#include <sys/arc.h>
	#include <sys/zio_crypt.h>
	#include <sys/zthr.h>
	#include <sys/aggsum.h>
	#include <sys/wmsum.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* Note that buffers can be in one of 6 states:
	* ARC_anon - anonymous (discussed below)
	* ARC_mru - recently used, currently cached
	* ARC_mru_ghost - recently used, no longer in cache
	* ARC_mfu - frequently used, currently cached
	* ARC_mfu_ghost - frequently used, no longer in cache
	* ARC_l2c_only - exists in L2ARC but not other states
	* When there are no active references to the buffer, they are
	* are linked onto a list in one of these arc states. These are
	* the only buffers that can be evicted or deleted. Within each
	* state there are multiple lists, one for meta-data and one for
	* non-meta-data. Meta-data (indirect blocks, blocks of dnodes,
	* etc.) is tracked separately so that it can be managed more
	* explicitly: favored over data, limited explicitly.
	*
	* Anonymous buffers are buffers that are not associated with
	* a DVA. These are buffers that hold dirty block copies
	* before they are written to stable storage. By definition,
	* they are "ref'd" and are considered part of arc_mru
	* that cannot be freed. Generally, they will acquire a DVA
	* as they are written and migrate onto the arc_mru list.
	*
	* The ARC_l2c_only state is for buffers that are in the second
	* level ARC but no longer in any of the ARC_m* lists. The second
	* level ARC itself may also contain buffers that are in any of
	* the ARC_m* states - meaning that a buffer can exist in two
	* places. The reason for the ARC_l2c_only state is to keep the
	* buffer header in the hash table, so that reads that hit the
	* second level ARC benefit from these fast lookups.
	*/

	typedef struct arc_state {
	/*
	* list of evictable buffers
	*/
	multilist_t arcs_list[ARC_BUFC_NUMTYPES];
	/*
	* supports the "dbufs" kstat
	*/
	arc_state_type_t arcs_state;
	/*
	* total amount of evictable data in this state
	*/
	zfs_refcount_t arcs_esize[ARC_BUFC_NUMTYPES] ____cacheline_aligned;
	/*
	* total amount of data in this state; this includes: evictable,
	* non-evictable, ARC_BUFC_DATA, and ARC_BUFC_METADATA.
	*/
	zfs_refcount_t arcs_size;
	} arc_state_t;

	typedef struct arc_callback arc_callback_t;

	struct arc_callback {
	void *acb_private;
	arc_read_done_func_t *acb_done;
	arc_buf_t *acb_buf;
	boolean_t acb_encrypted;
	boolean_t acb_compressed;
	boolean_t acb_noauth;
	boolean_t acb_nobuf;
	zbookmark_phys_t acb_zb;
	zio_t *acb_zio_dummy;
	zio_t *acb_zio_head;
	arc_callback_t *acb_next;
	};

	typedef struct arc_write_callback arc_write_callback_t;

	struct arc_write_callback {
	void *awcb_private;
	arc_write_done_func_t *awcb_ready;
	arc_write_done_func_t *awcb_children_ready;
	arc_write_done_func_t *awcb_physdone;
	arc_write_done_func_t *awcb_done;
	arc_buf_t *awcb_buf;
	};

	/*
	* ARC buffers are separated into multiple structs as a memory saving measure:
	* - Common fields struct, always defined, and embedded within it:
	* - L2-only fields, always allocated but undefined when not in L2ARC
	* - L1-only fields, only allocated when in L1ARC
	*
	* Buffer in L1 Buffer only in L2
	* +------------------------+ +------------------------+
	* \| arc_buf_hdr_t \| \| arc_buf_hdr_t \|
	* \| \| \| \|
	* \| \| \| \|
	* \| \| \| \|
	* +------------------------+ +------------------------+
	* \| l2arc_buf_hdr_t \| \| l2arc_buf_hdr_t \|
	* \| (undefined if L1-only) \| \| \|
	* +------------------------+ +------------------------+
	* \| l1arc_buf_hdr_t \|
	* \| \|
	* \| \|
	* \| \|
	* \| \|
	* +------------------------+
	*
	* Because it's possible for the L2ARC to become extremely large, we can wind
	* up eating a lot of memory in L2ARC buffer headers, so the size of a header
	* is minimized by only allocating the fields necessary for an L1-cached buffer
	* when a header is actually in the L1 cache. The sub-headers (l1arc_buf_hdr and
	* l2arc_buf_hdr) are embedded rather than allocated separately to save a couple
	* words in pointers. arc_hdr_realloc() is used to switch a header between
	* these two allocation states.
	*/
	typedef struct l1arc_buf_hdr {
	kmutex_t b_freeze_lock;
	zio_cksum_t *b_freeze_cksum;

	- arc_buf_t *b_buf;
	- uint32_t b_bufcnt;
	- /* for waiting on writes to complete */
	+ /* for waiting on reads to complete */
	kcondvar_t b_cv;
	uint8_t b_byteswap;

	-
	/* protected by arc state mutex */
	arc_state_t *b_state;
	multilist_node_t b_arc_node;

	- /* updated atomically */
	+ /* protected by hash lock */
	clock_t b_arc_access;
	uint32_t b_mru_hits;
	uint32_t b_mru_ghost_hits;
	uint32_t b_mfu_hits;
	uint32_t b_mfu_ghost_hits;
	- uint32_t b_l2_hits;
	+ uint32_t b_bufcnt;
	+ arc_buf_t *b_buf;

	/* self protecting */
	zfs_refcount_t b_refcnt;

	arc_callback_t *b_acb;
	abd_t *b_pabd;
	} l1arc_buf_hdr_t;

	typedef enum l2arc_dev_hdr_flags_t {
	L2ARC_DEV_HDR_EVICT_FIRST = (1 << 0) /* mirror of l2ad_first */
	} l2arc_dev_hdr_flags_t;

	/*
	* Pointer used in persistent L2ARC (for pointing to log blocks).
	*/
	typedef struct l2arc_log_blkptr {
	/*
	* Offset of log block within the device, in bytes
	*/
	uint64_t lbp_daddr;
	/*
	* Aligned payload size (in bytes) of the log block
	*/
	uint64_t lbp_payload_asize;
	/*
	* Offset in bytes of the first buffer in the payload
	*/
	uint64_t lbp_payload_start;
	/*
	* lbp_prop has the following format:
	* * logical size (in bytes)
	* * aligned (after compression) size (in bytes)
	* * compression algorithm (we always LZ4-compress l2arc logs)
	* * checksum algorithm (used for lbp_cksum)
	*/
	uint64_t lbp_prop;
	zio_cksum_t lbp_cksum; /* checksum of log */
	} l2arc_log_blkptr_t;

	/*
	* The persistent L2ARC device header.
	* Byte order of magic determines whether 64-bit bswap of fields is necessary.
	*/
	typedef struct l2arc_dev_hdr_phys {
	uint64_t dh_magic; /* L2ARC_DEV_HDR_MAGIC */
	uint64_t dh_version; /* Persistent L2ARC version */

	/*
	* Global L2ARC device state and metadata.
	*/
	uint64_t dh_spa_guid;
	uint64_t dh_vdev_guid;
	uint64_t dh_log_entries; /* mirror of l2ad_log_entries */
	uint64_t dh_evict; /* evicted offset in bytes */
	uint64_t dh_flags; /* l2arc_dev_hdr_flags_t */
	/*
	* Used in zdb.c for determining if a log block is valid, in the same
	* way that l2arc_rebuild() does.
	*/
	uint64_t dh_start; /* mirror of l2ad_start */
	uint64_t dh_end; /* mirror of l2ad_end */
	/*
	* Start of log block chain. [0] -> newest log, [1] -> one older (used
	* for initiating prefetch).
	*/
	l2arc_log_blkptr_t dh_start_lbps[2];
	/*
	* Aligned size of all log blocks as accounted by vdev_space_update().
	*/
	uint64_t dh_lb_asize; /* mirror of l2ad_lb_asize */
	uint64_t dh_lb_count; /* mirror of l2ad_lb_count */
	/*
	* Mirrors of vdev_trim_action_time and vdev_trim_state, used to
	* display when the cache device was fully trimmed for the last
	* time.
	*/
	uint64_t dh_trim_action_time;
	uint64_t dh_trim_state;
	const uint64_t dh_pad[30]; /* pad to 512 bytes */
	zio_eck_t dh_tail;
	} l2arc_dev_hdr_phys_t;
	CTASSERT_GLOBAL(sizeof (l2arc_dev_hdr_phys_t) == SPA_MINBLOCKSIZE);

	/*
	* A single ARC buffer header entry in a l2arc_log_blk_phys_t.
	*/
	typedef struct l2arc_log_ent_phys {
	dva_t le_dva; /* dva of buffer */
	uint64_t le_birth; /* birth txg of buffer */
	/*
	* le_prop has the following format:
	* * logical size (in bytes)
	* * physical (compressed) size (in bytes)
	* * compression algorithm
	* * object type (used to restore arc_buf_contents_t)
	* * protected status (used for encryption)
	* * prefetch status (used in l2arc_read_done())
	*/
	uint64_t le_prop;
	uint64_t le_daddr; /* buf location on l2dev */
	uint64_t le_complevel;
	/*
	* We pad the size of each entry to a power of 2 so that the size of
	* l2arc_log_blk_phys_t is power-of-2 aligned with SPA_MINBLOCKSHIFT,
	* because of the L2ARC_SET_*SIZE macros.
	*/
	const uint64_t le_pad[2]; /* pad to 64 bytes */
	} l2arc_log_ent_phys_t;

	#define L2ARC_LOG_BLK_MAX_ENTRIES (1022)

	/*
	* A log block of up to 1022 ARC buffer log entries, chained into the
	* persistent L2ARC metadata linked list. Byte order of magic determines
	* whether 64-bit bswap of fields is necessary.
	*/
	typedef struct l2arc_log_blk_phys {
	uint64_t lb_magic; /* L2ARC_LOG_BLK_MAGIC */
	/*
	* There are 2 chains (headed by dh_start_lbps[2]), and this field
	* points back to the previous block in this chain. We alternate
	* which chain we append to, so they are time-wise and offset-wise
	* interleaved, but that is an optimization rather than for
	* correctness.
	*/
	l2arc_log_blkptr_t lb_prev_lbp; /* pointer to prev log block */
	/*
	* Pad header section to 128 bytes
	*/
	uint64_t lb_pad[7];
	/* Payload */
	l2arc_log_ent_phys_t lb_entries[L2ARC_LOG_BLK_MAX_ENTRIES];
	} l2arc_log_blk_phys_t; /* 64K total */

	/*
	* The size of l2arc_log_blk_phys_t has to be power-of-2 aligned with
	* SPA_MINBLOCKSHIFT because of L2BLK_SET_*SIZE macros.
	*/
	CTASSERT_GLOBAL(IS_P2ALIGNED(sizeof (l2arc_log_blk_phys_t),
	1ULL << SPA_MINBLOCKSHIFT));
	CTASSERT_GLOBAL(sizeof (l2arc_log_blk_phys_t) >= SPA_MINBLOCKSIZE);
	CTASSERT_GLOBAL(sizeof (l2arc_log_blk_phys_t) <= SPA_MAXBLOCKSIZE);

	/*
	* These structures hold in-flight abd buffers for log blocks as they're being
	* written to the L2ARC device.
	*/
	typedef struct l2arc_lb_abd_buf {
	abd_t *abd;
	list_node_t node;
	} l2arc_lb_abd_buf_t;

	/*
	* These structures hold pointers to log blocks present on the L2ARC device.
	*/
	typedef struct l2arc_lb_ptr_buf {
	l2arc_log_blkptr_t *lb_ptr;
	list_node_t node;
	} l2arc_lb_ptr_buf_t;

	/* Macros for setting fields in le_prop and lbp_prop */
	#define L2BLK_GET_LSIZE(field) \
	BF64_GET_SB((field), 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1)
	#define L2BLK_SET_LSIZE(field, x) \
	BF64_SET_SB((field), 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x)
	#define L2BLK_GET_PSIZE(field) \
	BF64_GET_SB((field), 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1)
	#define L2BLK_SET_PSIZE(field, x) \
	BF64_SET_SB((field), 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x)
	#define L2BLK_GET_COMPRESS(field) \
	BF64_GET((field), 32, SPA_COMPRESSBITS)
	#define L2BLK_SET_COMPRESS(field, x) \
	BF64_SET((field), 32, SPA_COMPRESSBITS, x)
	#define L2BLK_GET_PREFETCH(field) BF64_GET((field), 39, 1)
	#define L2BLK_SET_PREFETCH(field, x) BF64_SET((field), 39, 1, x)
	#define L2BLK_GET_CHECKSUM(field) BF64_GET((field), 40, 8)
	#define L2BLK_SET_CHECKSUM(field, x) BF64_SET((field), 40, 8, x)
	#define L2BLK_GET_TYPE(field) BF64_GET((field), 48, 8)
	#define L2BLK_SET_TYPE(field, x) BF64_SET((field), 48, 8, x)
	#define L2BLK_GET_PROTECTED(field) BF64_GET((field), 56, 1)
	#define L2BLK_SET_PROTECTED(field, x) BF64_SET((field), 56, 1, x)
	#define L2BLK_GET_STATE(field) BF64_GET((field), 57, 4)
	#define L2BLK_SET_STATE(field, x) BF64_SET((field), 57, 4, x)

	#define PTR_SWAP(x, y) \
	do { \
	void *tmp = (x);\
	x = y; \
	y = tmp; \
	_NOTE(CONSTCOND)\
	} while (0)

	#define L2ARC_DEV_HDR_MAGIC 0x5a46534341434845LLU /* ASCII: "ZFSCACHE" */
	#define L2ARC_LOG_BLK_MAGIC 0x4c4f47424c4b4844LLU /* ASCII: "LOGBLKHD" */

	/*
	* L2ARC Internals
	*/
	typedef struct l2arc_dev {
	vdev_t l2ad_vdev; / vdev */
	spa_t l2ad_spa; / spa */
	uint64_t l2ad_hand; /* next write location */
	uint64_t l2ad_start; /* first addr on device */
	uint64_t l2ad_end; /* last addr on device */
	boolean_t l2ad_first; /* first sweep through */
	boolean_t l2ad_writing; /* currently writing */
	kmutex_t l2ad_mtx; /* lock for buffer list */
	list_t l2ad_buflist; /* buffer list */
	list_node_t l2ad_node; /* device list node */
	zfs_refcount_t l2ad_alloc; /* allocated bytes */
	/*
	* Persistence-related stuff
	*/
	l2arc_dev_hdr_phys_t l2ad_dev_hdr; / persistent device header */
	uint64_t l2ad_dev_hdr_asize; /* aligned hdr size */
	l2arc_log_blk_phys_t l2ad_log_blk; /* currently open log block */
	int l2ad_log_ent_idx; /* index into cur log blk */
	/* Number of bytes in current log block's payload */
	uint64_t l2ad_log_blk_payload_asize;
	/*
	* Offset (in bytes) of the first buffer in current log block's
	* payload.
	*/
	uint64_t l2ad_log_blk_payload_start;
	/* Flag indicating whether a rebuild is scheduled or is going on */
	boolean_t l2ad_rebuild;
	boolean_t l2ad_rebuild_cancel;
	boolean_t l2ad_rebuild_began;
	uint64_t l2ad_log_entries; /* entries per log blk */
	uint64_t l2ad_evict; /* evicted offset in bytes */
	/* List of pointers to log blocks present in the L2ARC device */
	list_t l2ad_lbptr_list;
	/*
	* Aligned size of all log blocks as accounted by vdev_space_update().
	*/
	zfs_refcount_t l2ad_lb_asize;
	/*
	* Number of log blocks present on the device.
	*/
	zfs_refcount_t l2ad_lb_count;
	boolean_t l2ad_trim_all; /* TRIM whole device */
	} l2arc_dev_t;

	/*
	* Encrypted blocks will need to be stored encrypted on the L2ARC
	* disk as they appear in the main pool. In order for this to work we
	* need to pass around the encryption parameters so they can be used
	* to write data to the L2ARC. This struct is only defined in the
	* arc_buf_hdr_t if the L1 header is defined and has the ARC_FLAG_ENCRYPTED
	* flag set.
	*/
	typedef struct arc_buf_hdr_crypt {
	abd_t b_rabd; / raw encrypted data */
	dmu_object_type_t b_ot; /* object type */
	uint32_t b_ebufcnt; /* count of encrypted buffers */

	/* dsobj for looking up encryption key for l2arc encryption */
	uint64_t b_dsobj;

	/* encryption parameters */
	uint8_t b_salt[ZIO_DATA_SALT_LEN];
	uint8_t b_iv[ZIO_DATA_IV_LEN];

	/*
	* Technically this could be removed since we will always be able to
	* get the mac from the bp when we need it. However, it is inconvenient
	* for callers of arc code to have to pass a bp in all the time. This
	* also allows us to assert that L2ARC data is properly encrypted to
	* match the data in the main storage pool.
	*/
	uint8_t b_mac[ZIO_DATA_MAC_LEN];
	} arc_buf_hdr_crypt_t;

	typedef struct l2arc_buf_hdr {
	/* protected by arc_buf_hdr mutex */
	l2arc_dev_t b_dev; / L2ARC device */
	uint64_t b_daddr; /* disk address, offset byte */
	uint32_t b_hits;
	arc_state_type_t b_arcs_state;
	list_node_t b_l2node;
	} l2arc_buf_hdr_t;

	typedef struct l2arc_write_callback {
	l2arc_dev_t l2wcb_dev; / device info */
	arc_buf_hdr_t l2wcb_head; / head of write buflist */
	/* in-flight list of log blocks */
	list_t l2wcb_abd_list;
	} l2arc_write_callback_t;

	struct arc_buf_hdr {
	/* protected by hash lock */
	dva_t b_dva;
	uint64_t b_birth;

	arc_buf_contents_t b_type;
	uint8_t b_complevel;
	uint8_t b_reserved1; /* used for 4 byte alignment */
	uint16_t b_reserved2; /* used for 4 byte alignment */
	arc_buf_hdr_t *b_hash_next;
	arc_flags_t b_flags;

	/*
	* This field stores the size of the data buffer after
	* compression, and is set in the arc's zio completion handlers.
	* It is in units of SPA_MINBLOCKSIZE (e.g. 1 == 512 bytes).
	*
	* While the block pointers can store up to 32MB in their psize
	* field, we can only store up to 32MB minus 512B. This is due
	* to the bp using a bias of 1, whereas we use a bias of 0 (i.e.
	* a field of zeros represents 512B in the bp). We can't use a
	* bias of 1 since we need to reserve a psize of zero, here, to
	* represent holes and embedded blocks.
	*
	* This isn't a problem in practice, since the maximum size of a
	* buffer is limited to 16MB, so we never need to store 32MB in
	* this field. Even in the upstream illumos code base, the
	* maximum size of a buffer is limited to 16MB.
	*/
	uint16_t b_psize;

	/*
	* This field stores the size of the data buffer before
	* compression, and cannot change once set. It is in units
	* of SPA_MINBLOCKSIZE (e.g. 2 == 1024 bytes)
	*/
	uint16_t b_lsize; /* immutable */
	uint64_t b_spa; /* immutable */

	/* L2ARC fields. Undefined when not in L2ARC. */
	l2arc_buf_hdr_t b_l2hdr;
	/* L1ARC fields. Undefined when in l2arc_only state */
	l1arc_buf_hdr_t b_l1hdr;
	/*
	* Encryption parameters. Defined only when ARC_FLAG_ENCRYPTED
	* is set and the L1 header exists.
	*/
	arc_buf_hdr_crypt_t b_crypt_hdr;
	};

	typedef struct arc_stats {
	kstat_named_t arcstat_hits;
	kstat_named_t arcstat_misses;
	kstat_named_t arcstat_demand_data_hits;
	kstat_named_t arcstat_demand_data_misses;
	kstat_named_t arcstat_demand_metadata_hits;
	kstat_named_t arcstat_demand_metadata_misses;
	kstat_named_t arcstat_prefetch_data_hits;
	kstat_named_t arcstat_prefetch_data_misses;
	kstat_named_t arcstat_prefetch_metadata_hits;
	kstat_named_t arcstat_prefetch_metadata_misses;
	kstat_named_t arcstat_mru_hits;
	kstat_named_t arcstat_mru_ghost_hits;
	kstat_named_t arcstat_mfu_hits;
	kstat_named_t arcstat_mfu_ghost_hits;
	kstat_named_t arcstat_deleted;
	/*
	* Number of buffers that could not be evicted because the hash lock
	* was held by another thread. The lock may not necessarily be held
	* by something using the same buffer, since hash locks are shared
	* by multiple buffers.
	*/
	kstat_named_t arcstat_mutex_miss;
	/*
	* Number of buffers skipped when updating the access state due to the
	* header having already been released after acquiring the hash lock.
	*/
	kstat_named_t arcstat_access_skip;
	/*
	* Number of buffers skipped because they have I/O in progress, are
	* indirect prefetch buffers that have not lived long enough, or are
	* not from the spa we're trying to evict from.
	*/
	kstat_named_t arcstat_evict_skip;
	/*
	* Number of times arc_evict_state() was unable to evict enough
	* buffers to reach its target amount.
	*/
	kstat_named_t arcstat_evict_not_enough;
	kstat_named_t arcstat_evict_l2_cached;
	kstat_named_t arcstat_evict_l2_eligible;
	kstat_named_t arcstat_evict_l2_eligible_mfu;
	kstat_named_t arcstat_evict_l2_eligible_mru;
	kstat_named_t arcstat_evict_l2_ineligible;
	kstat_named_t arcstat_evict_l2_skip;
	kstat_named_t arcstat_hash_elements;
	kstat_named_t arcstat_hash_elements_max;
	kstat_named_t arcstat_hash_collisions;
	kstat_named_t arcstat_hash_chains;
	kstat_named_t arcstat_hash_chain_max;
	kstat_named_t arcstat_p;
	kstat_named_t arcstat_c;
	kstat_named_t arcstat_c_min;
	kstat_named_t arcstat_c_max;
	kstat_named_t arcstat_size;
	/*
	* Number of compressed bytes stored in the arc_buf_hdr_t's b_pabd.
	* Note that the compressed bytes may match the uncompressed bytes
	* if the block is either not compressed or compressed arc is disabled.
	*/
	kstat_named_t arcstat_compressed_size;
	/*
	* Uncompressed size of the data stored in b_pabd. If compressed
	* arc is disabled then this value will be identical to the stat
	* above.
	*/
	kstat_named_t arcstat_uncompressed_size;
	/*
	* Number of bytes stored in all the arc_buf_t's. This is classified
	* as "overhead" since this data is typically short-lived and will
	* be evicted from the arc when it becomes unreferenced unless the
	* zfs_keep_uncompressed_metadata or zfs_keep_uncompressed_level
	* values have been set (see comment in dbuf.c for more information).
	*/
	kstat_named_t arcstat_overhead_size;
	/*
	* Number of bytes consumed by internal ARC structures necessary
	* for tracking purposes; these structures are not actually
	* backed by ARC buffers. This includes arc_buf_hdr_t structures
	* (allocated via arc_buf_hdr_t_full and arc_buf_hdr_t_l2only
	* caches), and arc_buf_t structures (allocated via arc_buf_t
	* cache).
	*/
	kstat_named_t arcstat_hdr_size;
	/*
	* Number of bytes consumed by ARC buffers of type equal to
	* ARC_BUFC_DATA. This is generally consumed by buffers backing
	* on disk user data (e.g. plain file contents).
	*/
	kstat_named_t arcstat_data_size;
	/*
	* Number of bytes consumed by ARC buffers of type equal to
	* ARC_BUFC_METADATA. This is generally consumed by buffers
	* backing on disk data that is used for internal ZFS
	* structures (e.g. ZAP, dnode, indirect blocks, etc).
	*/
	kstat_named_t arcstat_metadata_size;
	/*
	* Number of bytes consumed by dmu_buf_impl_t objects.
	*/
	kstat_named_t arcstat_dbuf_size;
	/*
	* Number of bytes consumed by dnode_t objects.
	*/
	kstat_named_t arcstat_dnode_size;
	/*
	* Number of bytes consumed by bonus buffers.
	*/
	kstat_named_t arcstat_bonus_size;
	#if defined(COMPAT_FREEBSD11)
	/*
	* Sum of the previous three counters, provided for compatibility.
	*/
	kstat_named_t arcstat_other_size;
	#endif

	/*
	* Total number of bytes consumed by ARC buffers residing in the
	* arc_anon state. This includes all buffers in the arc_anon
	* state; e.g. data, metadata, evictable, and unevictable buffers
	* are all included in this value.
	*/
	kstat_named_t arcstat_anon_size;
	/*
	* Number of bytes consumed by ARC buffers that meet the
	* following criteria: backing buffers of type ARC_BUFC_DATA,
	* residing in the arc_anon state, and are eligible for eviction
	* (e.g. have no outstanding holds on the buffer).
	*/
	kstat_named_t arcstat_anon_evictable_data;
	/*
	* Number of bytes consumed by ARC buffers that meet the
	* following criteria: backing buffers of type ARC_BUFC_METADATA,
	* residing in the arc_anon state, and are eligible for eviction
	* (e.g. have no outstanding holds on the buffer).
	*/
	kstat_named_t arcstat_anon_evictable_metadata;
	/*
	* Total number of bytes consumed by ARC buffers residing in the
	* arc_mru state. This includes all buffers in the arc_mru
	* state; e.g. data, metadata, evictable, and unevictable buffers
	* are all included in this value.
	*/
	kstat_named_t arcstat_mru_size;
	/*
	* Number of bytes consumed by ARC buffers that meet the
	* following criteria: backing buffers of type ARC_BUFC_DATA,
	* residing in the arc_mru state, and are eligible for eviction
	* (e.g. have no outstanding holds on the buffer).
	*/
	kstat_named_t arcstat_mru_evictable_data;
	/*
	* Number of bytes consumed by ARC buffers that meet the
	* following criteria: backing buffers of type ARC_BUFC_METADATA,
	* residing in the arc_mru state, and are eligible for eviction
	* (e.g. have no outstanding holds on the buffer).
	*/
	kstat_named_t arcstat_mru_evictable_metadata;
	/*
	* Total number of bytes that would have been consumed by ARC
	* buffers in the arc_mru_ghost state. The key thing to note
	* here, is the fact that this size doesn't actually indicate
	* RAM consumption. The ghost lists only consist of headers and
	* don't actually have ARC buffers linked off of these headers.
	* Thus, if the headers had associated ARC buffers, these
	* buffers would have consumed this number of bytes.
	*/
	kstat_named_t arcstat_mru_ghost_size;
	/*
	* Number of bytes that would have been consumed by ARC
	* buffers that are eligible for eviction, of type
	* ARC_BUFC_DATA, and linked off the arc_mru_ghost state.
	*/
	kstat_named_t arcstat_mru_ghost_evictable_data;
	/*
	* Number of bytes that would have been consumed by ARC
	* buffers that are eligible for eviction, of type
	* ARC_BUFC_METADATA, and linked off the arc_mru_ghost state.
	*/
	kstat_named_t arcstat_mru_ghost_evictable_metadata;
	/*
	* Total number of bytes consumed by ARC buffers residing in the
	* arc_mfu state. This includes all buffers in the arc_mfu
	* state; e.g. data, metadata, evictable, and unevictable buffers
	* are all included in this value.
	*/
	kstat_named_t arcstat_mfu_size;
	/*
	* Number of bytes consumed by ARC buffers that are eligible for
	* eviction, of type ARC_BUFC_DATA, and reside in the arc_mfu
	* state.
	*/
	kstat_named_t arcstat_mfu_evictable_data;
	/*
	* Number of bytes consumed by ARC buffers that are eligible for
	* eviction, of type ARC_BUFC_METADATA, and reside in the
	* arc_mfu state.
	*/
	kstat_named_t arcstat_mfu_evictable_metadata;
	/*
	* Total number of bytes that would have been consumed by ARC
	* buffers in the arc_mfu_ghost state. See the comment above
	* arcstat_mru_ghost_size for more details.
	*/
	kstat_named_t arcstat_mfu_ghost_size;
	/*
	* Number of bytes that would have been consumed by ARC
	* buffers that are eligible for eviction, of type
	* ARC_BUFC_DATA, and linked off the arc_mfu_ghost state.
	*/
	kstat_named_t arcstat_mfu_ghost_evictable_data;
	/*
	* Number of bytes that would have been consumed by ARC
	* buffers that are eligible for eviction, of type
	* ARC_BUFC_METADATA, and linked off the arc_mru_ghost state.
	*/
	kstat_named_t arcstat_mfu_ghost_evictable_metadata;
	kstat_named_t arcstat_l2_hits;
	kstat_named_t arcstat_l2_misses;
	/*
	* Allocated size (in bytes) of L2ARC cached buffers by ARC state.
	*/
	kstat_named_t arcstat_l2_prefetch_asize;
	kstat_named_t arcstat_l2_mru_asize;
	kstat_named_t arcstat_l2_mfu_asize;
	/*
	* Allocated size (in bytes) of L2ARC cached buffers by buffer content
	* type.
	*/
	kstat_named_t arcstat_l2_bufc_data_asize;
	kstat_named_t arcstat_l2_bufc_metadata_asize;
	kstat_named_t arcstat_l2_feeds;
	kstat_named_t arcstat_l2_rw_clash;
	kstat_named_t arcstat_l2_read_bytes;
	kstat_named_t arcstat_l2_write_bytes;
	kstat_named_t arcstat_l2_writes_sent;
	kstat_named_t arcstat_l2_writes_done;
	kstat_named_t arcstat_l2_writes_error;
	kstat_named_t arcstat_l2_writes_lock_retry;
	kstat_named_t arcstat_l2_evict_lock_retry;
	kstat_named_t arcstat_l2_evict_reading;
	kstat_named_t arcstat_l2_evict_l1cached;
	kstat_named_t arcstat_l2_free_on_write;
	kstat_named_t arcstat_l2_abort_lowmem;
	kstat_named_t arcstat_l2_cksum_bad;
	kstat_named_t arcstat_l2_io_error;
	kstat_named_t arcstat_l2_lsize;
	kstat_named_t arcstat_l2_psize;
	kstat_named_t arcstat_l2_hdr_size;
	/*
	* Number of L2ARC log blocks written. These are used for restoring the
	* L2ARC. Updated during writing of L2ARC log blocks.
	*/
	kstat_named_t arcstat_l2_log_blk_writes;
	/*
	* Moving average of the aligned size of the L2ARC log blocks, in
	* bytes. Updated during L2ARC rebuild and during writing of L2ARC
	* log blocks.
	*/
	kstat_named_t arcstat_l2_log_blk_avg_asize;
	/* Aligned size of L2ARC log blocks on L2ARC devices. */
	kstat_named_t arcstat_l2_log_blk_asize;
	/* Number of L2ARC log blocks present on L2ARC devices. */
	kstat_named_t arcstat_l2_log_blk_count;
	/*
	* Moving average of the aligned size of L2ARC restored data, in bytes,
	* to the aligned size of their metadata in L2ARC, in bytes.
	* Updated during L2ARC rebuild and during writing of L2ARC log blocks.
	*/
	kstat_named_t arcstat_l2_data_to_meta_ratio;
	/*
	* Number of times the L2ARC rebuild was successful for an L2ARC device.
	*/
	kstat_named_t arcstat_l2_rebuild_success;
	/*
	* Number of times the L2ARC rebuild failed because the device header
	* was in an unsupported format or corrupted.
	*/
	kstat_named_t arcstat_l2_rebuild_abort_unsupported;
	/*
	* Number of times the L2ARC rebuild failed because of IO errors
	* while reading a log block.
	*/
	kstat_named_t arcstat_l2_rebuild_abort_io_errors;
	/*
	* Number of times the L2ARC rebuild failed because of IO errors when
	* reading the device header.
	*/
	kstat_named_t arcstat_l2_rebuild_abort_dh_errors;
	/*
	* Number of L2ARC log blocks which failed to be restored due to
	* checksum errors.
	*/
	kstat_named_t arcstat_l2_rebuild_abort_cksum_lb_errors;
	/*
	* Number of times the L2ARC rebuild was aborted due to low system
	* memory.
	*/
	kstat_named_t arcstat_l2_rebuild_abort_lowmem;
	/* Logical size of L2ARC restored data, in bytes. */
	kstat_named_t arcstat_l2_rebuild_size;
	/* Aligned size of L2ARC restored data, in bytes. */
	kstat_named_t arcstat_l2_rebuild_asize;
	/*
	* Number of L2ARC log entries (buffers) that were successfully
	* restored in ARC.
	*/
	kstat_named_t arcstat_l2_rebuild_bufs;
	/*
	* Number of L2ARC log entries (buffers) already cached in ARC. These
	* were not restored again.
	*/
	kstat_named_t arcstat_l2_rebuild_bufs_precached;
	/*
	* Number of L2ARC log blocks that were restored successfully. Each
	* log block may hold up to L2ARC_LOG_BLK_MAX_ENTRIES buffers.
	*/
	kstat_named_t arcstat_l2_rebuild_log_blks;
	kstat_named_t arcstat_memory_throttle_count;
	kstat_named_t arcstat_memory_direct_count;
	kstat_named_t arcstat_memory_indirect_count;
	kstat_named_t arcstat_memory_all_bytes;
	kstat_named_t arcstat_memory_free_bytes;
	kstat_named_t arcstat_memory_available_bytes;
	kstat_named_t arcstat_no_grow;
	kstat_named_t arcstat_tempreserve;
	kstat_named_t arcstat_loaned_bytes;
	kstat_named_t arcstat_prune;
	kstat_named_t arcstat_meta_used;
	kstat_named_t arcstat_meta_limit;
	kstat_named_t arcstat_dnode_limit;
	kstat_named_t arcstat_meta_max;
	kstat_named_t arcstat_meta_min;
	kstat_named_t arcstat_async_upgrade_sync;
	kstat_named_t arcstat_demand_hit_predictive_prefetch;
	kstat_named_t arcstat_demand_hit_prescient_prefetch;
	kstat_named_t arcstat_need_free;
	kstat_named_t arcstat_sys_free;
	kstat_named_t arcstat_raw_size;
	kstat_named_t arcstat_cached_only_in_progress;
	kstat_named_t arcstat_abd_chunk_waste_size;
	} arc_stats_t;

	typedef struct arc_sums {
	wmsum_t arcstat_hits;
	wmsum_t arcstat_misses;
	wmsum_t arcstat_demand_data_hits;
	wmsum_t arcstat_demand_data_misses;
	wmsum_t arcstat_demand_metadata_hits;
	wmsum_t arcstat_demand_metadata_misses;
	wmsum_t arcstat_prefetch_data_hits;
	wmsum_t arcstat_prefetch_data_misses;
	wmsum_t arcstat_prefetch_metadata_hits;
	wmsum_t arcstat_prefetch_metadata_misses;
	wmsum_t arcstat_mru_hits;
	wmsum_t arcstat_mru_ghost_hits;
	wmsum_t arcstat_mfu_hits;
	wmsum_t arcstat_mfu_ghost_hits;
	wmsum_t arcstat_deleted;
	wmsum_t arcstat_mutex_miss;
	wmsum_t arcstat_access_skip;
	wmsum_t arcstat_evict_skip;
	wmsum_t arcstat_evict_not_enough;
	wmsum_t arcstat_evict_l2_cached;
	wmsum_t arcstat_evict_l2_eligible;
	wmsum_t arcstat_evict_l2_eligible_mfu;
	wmsum_t arcstat_evict_l2_eligible_mru;
	wmsum_t arcstat_evict_l2_ineligible;
	wmsum_t arcstat_evict_l2_skip;
	wmsum_t arcstat_hash_collisions;
	wmsum_t arcstat_hash_chains;
	aggsum_t arcstat_size;
	wmsum_t arcstat_compressed_size;
	wmsum_t arcstat_uncompressed_size;
	wmsum_t arcstat_overhead_size;
	wmsum_t arcstat_hdr_size;
	wmsum_t arcstat_data_size;
	wmsum_t arcstat_metadata_size;
	wmsum_t arcstat_dbuf_size;
	aggsum_t arcstat_dnode_size;
	wmsum_t arcstat_bonus_size;
	wmsum_t arcstat_l2_hits;
	wmsum_t arcstat_l2_misses;
	wmsum_t arcstat_l2_prefetch_asize;
	wmsum_t arcstat_l2_mru_asize;
	wmsum_t arcstat_l2_mfu_asize;
	wmsum_t arcstat_l2_bufc_data_asize;
	wmsum_t arcstat_l2_bufc_metadata_asize;
	wmsum_t arcstat_l2_feeds;
	wmsum_t arcstat_l2_rw_clash;
	wmsum_t arcstat_l2_read_bytes;
	wmsum_t arcstat_l2_write_bytes;
	wmsum_t arcstat_l2_writes_sent;
	wmsum_t arcstat_l2_writes_done;
	wmsum_t arcstat_l2_writes_error;
	wmsum_t arcstat_l2_writes_lock_retry;
	wmsum_t arcstat_l2_evict_lock_retry;
	wmsum_t arcstat_l2_evict_reading;
	wmsum_t arcstat_l2_evict_l1cached;
	wmsum_t arcstat_l2_free_on_write;
	wmsum_t arcstat_l2_abort_lowmem;
	wmsum_t arcstat_l2_cksum_bad;
	wmsum_t arcstat_l2_io_error;
	wmsum_t arcstat_l2_lsize;
	wmsum_t arcstat_l2_psize;
	aggsum_t arcstat_l2_hdr_size;
	wmsum_t arcstat_l2_log_blk_writes;
	wmsum_t arcstat_l2_log_blk_asize;
	wmsum_t arcstat_l2_log_blk_count;
	wmsum_t arcstat_l2_rebuild_success;
	wmsum_t arcstat_l2_rebuild_abort_unsupported;
	wmsum_t arcstat_l2_rebuild_abort_io_errors;
	wmsum_t arcstat_l2_rebuild_abort_dh_errors;
	wmsum_t arcstat_l2_rebuild_abort_cksum_lb_errors;
	wmsum_t arcstat_l2_rebuild_abort_lowmem;
	wmsum_t arcstat_l2_rebuild_size;
	wmsum_t arcstat_l2_rebuild_asize;
	wmsum_t arcstat_l2_rebuild_bufs;
	wmsum_t arcstat_l2_rebuild_bufs_precached;
	wmsum_t arcstat_l2_rebuild_log_blks;
	wmsum_t arcstat_memory_throttle_count;
	wmsum_t arcstat_memory_direct_count;
	wmsum_t arcstat_memory_indirect_count;
	wmsum_t arcstat_prune;
	aggsum_t arcstat_meta_used;
	wmsum_t arcstat_async_upgrade_sync;
	wmsum_t arcstat_demand_hit_predictive_prefetch;
	wmsum_t arcstat_demand_hit_prescient_prefetch;
	wmsum_t arcstat_raw_size;
	wmsum_t arcstat_cached_only_in_progress;
	wmsum_t arcstat_abd_chunk_waste_size;
	} arc_sums_t;

	typedef struct arc_evict_waiter {
	list_node_t aew_node;
	kcondvar_t aew_cv;
	uint64_t aew_count;
	} arc_evict_waiter_t;

	#define ARCSTAT(stat) (arc_stats.stat.value.ui64)

	#define ARCSTAT_INCR(stat, val) \
	wmsum_add(&arc_sums.stat, (val))

	#define ARCSTAT_BUMP(stat) ARCSTAT_INCR(stat, 1)
	#define ARCSTAT_BUMPDOWN(stat) ARCSTAT_INCR(stat, -1)

	#define arc_no_grow ARCSTAT(arcstat_no_grow) /* do not grow cache size */
	#define arc_p ARCSTAT(arcstat_p) /* target size of MRU */
	#define arc_c ARCSTAT(arcstat_c) /* target size of cache */
	#define arc_c_min ARCSTAT(arcstat_c_min) /* min target cache size */
	#define arc_c_max ARCSTAT(arcstat_c_max) /* max target cache size */
	#define arc_sys_free ARCSTAT(arcstat_sys_free) /* target system free bytes */

	+#define arc_anon (&ARC_anon)
	+#define arc_mru (&ARC_mru)
	+#define arc_mru_ghost (&ARC_mru_ghost)
	+#define arc_mfu (&ARC_mfu)
	+#define arc_mfu_ghost (&ARC_mfu_ghost)
	+#define arc_l2c_only (&ARC_l2c_only)
	+
	extern taskq_t *arc_prune_taskq;
	extern arc_stats_t arc_stats;
	extern arc_sums_t arc_sums;
	extern hrtime_t arc_growtime;
	extern boolean_t arc_warm;
	extern int arc_grow_retry;
	extern int arc_no_grow_shift;
	extern int arc_shrink_shift;
	extern kmutex_t arc_prune_mtx;
	extern list_t arc_prune_list;
	-extern arc_state_t *arc_mfu;
	-extern arc_state_t *arc_mru;
	+extern arc_state_t ARC_mfu;
	+extern arc_state_t ARC_mru;
	extern uint_t zfs_arc_pc_percent;
	extern int arc_lotsfree_percent;
	extern unsigned long zfs_arc_min;
	extern unsigned long zfs_arc_max;

	extern void arc_reduce_target_size(int64_t to_free);
	extern boolean_t arc_reclaim_needed(void);
	extern void arc_kmem_reap_soon(void);
	-extern boolean_t arc_is_overflowing(void);
	-extern void arc_wait_for_eviction(uint64_t);
	+extern void arc_wait_for_eviction(uint64_t, boolean_t);

	extern void arc_lowmem_init(void);
	extern void arc_lowmem_fini(void);
	extern void arc_prune_async(int64_t);
	extern int arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg);
	extern uint64_t arc_free_memory(void);
	extern int64_t arc_available_memory(void);
	extern void arc_tuning_update(boolean_t);
	extern void arc_register_hotplug(void);
	extern void arc_unregister_hotplug(void);

	extern int param_set_arc_long(ZFS_MODULE_PARAM_ARGS);
	extern int param_set_arc_int(ZFS_MODULE_PARAM_ARGS);
	+extern int param_set_arc_min(ZFS_MODULE_PARAM_ARGS);
	+extern int param_set_arc_max(ZFS_MODULE_PARAM_ARGS);

	/* used in zdb.c */
	boolean_t l2arc_log_blkptr_valid(l2arc_dev_t *dev,
	const l2arc_log_blkptr_t *lbp);

	/* used in vdev_trim.c */
	void l2arc_dev_hdr_update(l2arc_dev_t *dev);
	l2arc_dev_t l2arc_vdev_get(vdev_t vd);

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_ARC_IMPL_H */
	diff --git a/sys/contrib/openzfs/include/sys/dbuf.h b/sys/contrib/openzfs/include/sys/dbuf.h
	index d221eac4c816..d2c175af649c 100644
	--- a/sys/contrib/openzfs/include/sys/dbuf.h
	+++ b/sys/contrib/openzfs/include/sys/dbuf.h
	@@ -1,503 +1,503 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	*/

	#ifndef _SYS_DBUF_H
	#define _SYS_DBUF_H

	#include <sys/dmu.h>
	#include <sys/spa.h>
	#include <sys/txg.h>
	#include <sys/zio.h>
	#include <sys/arc.h>
	#include <sys/zfs_context.h>
	#include <sys/zfs_refcount.h>
	#include <sys/zrlock.h>
	#include <sys/multilist.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	#define IN_DMU_SYNC 2

	/*
	* define flags for dbuf_read
	*/

	#define DB_RF_MUST_SUCCEED (1 << 0)
	#define DB_RF_CANFAIL (1 << 1)
	#define DB_RF_HAVESTRUCT (1 << 2)
	#define DB_RF_NOPREFETCH (1 << 3)
	#define DB_RF_NEVERWAIT (1 << 4)
	#define DB_RF_CACHED (1 << 5)
	#define DB_RF_NO_DECRYPT (1 << 6)

	/*
	* The simplified state transition diagram for dbufs looks like:
	*
	* +----> READ ----+
	* \| \|
	* \| V
	* (alloc)-->UNCACHED CACHED-->EVICTING-->(free)
	* \| ^ ^
	* \| \| \|
	* +----> FILL ----+ \|
	* \| \|
	* \| \|
	* +--------> NOFILL -------+
	*
	* DB_SEARCH is an invalid state for a dbuf. It is used by dbuf_free_range
	* to find all dbufs in a range of a dnode and must be less than any other
	* dbuf_states_t (see comment on dn_dbufs in dnode.h).
	*/
	typedef enum dbuf_states {
	DB_SEARCH = -1,
	DB_UNCACHED,
	DB_FILL,
	DB_NOFILL,
	DB_READ,
	DB_CACHED,
	DB_EVICTING
	} dbuf_states_t;

	typedef enum dbuf_cached_state {
	DB_NO_CACHE = -1,
	DB_DBUF_CACHE,
	DB_DBUF_METADATA_CACHE,
	DB_CACHE_MAX
	} dbuf_cached_state_t;

	struct dnode;
	struct dmu_tx;

	/*
	* level = 0 means the user data
	* level = 1 means the single indirect block
	* etc.
	*/

	struct dmu_buf_impl;

	typedef enum override_states {
	DR_NOT_OVERRIDDEN,
	DR_IN_DMU_SYNC,
	DR_OVERRIDDEN
	} override_states_t;

	typedef enum db_lock_type {
	DLT_NONE,
	DLT_PARENT,
	DLT_OBJSET
	} db_lock_type_t;

	typedef struct dbuf_dirty_record {
	/* link on our parents dirty list */
	list_node_t dr_dirty_node;

	/* transaction group this data will sync in */
	uint64_t dr_txg;

	/* zio of outstanding write IO */
	zio_t *dr_zio;

	/* pointer back to our dbuf */
	struct dmu_buf_impl *dr_dbuf;

	/* list link for dbuf dirty records */
	list_node_t dr_dbuf_node;

	/*
	* The dnode we are part of. Note that the dnode can not be moved or
	* evicted due to the hold that's added by dnode_setdirty() or
	* dmu_objset_sync_dnodes(), and released by dnode_rele_task() or
	* userquota_updates_task(). This hold is necessary for
	* dirty_lightweight_leaf-type dirty records, which don't have a hold
	* on a dbuf.
	*/
	dnode_t *dr_dnode;

	/* pointer to parent dirty record */
	struct dbuf_dirty_record *dr_parent;

	/* How much space was changed to dsl_pool_dirty_space() for this? */
	unsigned int dr_accounted;

	/* A copy of the bp that points to us */
	blkptr_t dr_bp_copy;

	union dirty_types {
	struct dirty_indirect {

	/* protect access to list */
	kmutex_t dr_mtx;

	/* Our list of dirty children */
	list_t dr_children;
	} di;
	struct dirty_leaf {

	/*
	* dr_data is set when we dirty the buffer
	* so that we can retain the pointer even if it
	* gets COW'd in a subsequent transaction group.
	*/
	arc_buf_t *dr_data;
	blkptr_t dr_overridden_by;
	override_states_t dr_override_state;
	uint8_t dr_copies;
	boolean_t dr_nopwrite;
	boolean_t dr_has_raw_params;

	/*
	* If dr_has_raw_params is set, the following crypt
	* params will be set on the BP that's written.
	*/
	boolean_t dr_byteorder;
	uint8_t dr_salt[ZIO_DATA_SALT_LEN];
	uint8_t dr_iv[ZIO_DATA_IV_LEN];
	uint8_t dr_mac[ZIO_DATA_MAC_LEN];
	} dl;
	struct dirty_lightweight_leaf {
	/*
	* This dirty record refers to a leaf (level=0)
	* block, whose dbuf has not been instantiated for
	* performance reasons.
	*/
	uint64_t dr_blkid;
	abd_t *dr_abd;
	zio_prop_t dr_props;
	enum zio_flag dr_flags;
	} dll;
	} dt;
	} dbuf_dirty_record_t;

	typedef struct dmu_buf_impl {
	/*
	* The following members are immutable, with the exception of
	* db.db_data, which is protected by db_mtx.
	*/

	/* the publicly visible structure */
	dmu_buf_t db;

	/* the objset we belong to */
	struct objset *db_objset;

	/*
	* handle to safely access the dnode we belong to (NULL when evicted)
	*/
	struct dnode_handle *db_dnode_handle;

	/*
	* our parent buffer; if the dnode points to us directly,
	* db_parent == db_dnode_handle->dnh_dnode->dn_dbuf
	* only accessed by sync thread ???
	* (NULL when evicted)
	* May change from NULL to non-NULL under the protection of db_mtx
	* (see dbuf_check_blkptr())
	*/
	struct dmu_buf_impl *db_parent;

	/*
	* link for hash table of all dmu_buf_impl_t's
	*/
	struct dmu_buf_impl *db_hash_next;

	/*
	* Our link on the owner dnodes's dn_dbufs list.
	* Protected by its dn_dbufs_mtx. Should be on the same cache line
	* as db_level and db_blkid for the best avl_add() performance.
	*/
	avl_node_t db_link;

	/* our block number */
	uint64_t db_blkid;

	/*
	* Pointer to the blkptr_t which points to us. May be NULL if we
	* don't have one yet. (NULL when evicted)
	*/
	blkptr_t *db_blkptr;

	/*
	* Our indirection level. Data buffers have db_level==0.
	* Indirect buffers which point to data buffers have
	* db_level==1. etc. Buffers which contain dnodes have
	* db_level==0, since the dnodes are stored in a file.
	*/
	uint8_t db_level;

	/*
	* Protects db_buf's contents if they contain an indirect block or data
	* block of the meta-dnode. We use this lock to protect the structure of
	* the block tree. This means that when modifying this dbuf's data, we
	* grab its rwlock. When modifying its parent's data (including the
	* blkptr to this dbuf), we grab the parent's rwlock. The lock ordering
	* for this lock is:
	* 1) dn_struct_rwlock
	* 2) db_rwlock
	* We don't currently grab multiple dbufs' db_rwlocks at once.
	*/
	krwlock_t db_rwlock;

	/* buffer holding our data */
	arc_buf_t *db_buf;

	/* db_mtx protects the members below */
	kmutex_t db_mtx;

	/*
	* Current state of the buffer
	*/
	dbuf_states_t db_state;

	/*
	* Refcount accessed by dmu_buf_{hold,rele}.
	* If nonzero, the buffer can't be destroyed.
	* Protected by db_mtx.
	*/
	zfs_refcount_t db_holds;

	kcondvar_t db_changed;
	dbuf_dirty_record_t *db_data_pending;

	/* List of dirty records for the buffer sorted newest to oldest. */
	list_t db_dirty_records;

	/* Link in dbuf_cache or dbuf_metadata_cache */
	multilist_node_t db_cache_link;

	/* Tells us which dbuf cache this dbuf is in, if any */
	dbuf_cached_state_t db_caching_status;

	/* Data which is unique to data (leaf) blocks: */

	/* User callback information. */
	dmu_buf_user_t *db_user;

	/*
	* Evict user data as soon as the dirty and reference
	* counts are equal.
	*/
	uint8_t db_user_immediate_evict;

	/*
	* This block was freed while a read or write was
	* active.
	*/
	uint8_t db_freed_in_flight;

	/*
	* dnode_evict_dbufs() or dnode_evict_bonus() tried to
	* evict this dbuf, but couldn't due to outstanding
	* references. Evict once the refcount drops to 0.
	*/
	uint8_t db_pending_evict;

	uint8_t db_dirtycnt;
	} dmu_buf_impl_t;

	/* Note: the dbuf hash table is exposed only for the mdb module */
	-#define DBUF_MUTEXES 8192
	+#define DBUF_MUTEXES 2048
	#define DBUF_HASH_MUTEX(h, idx) (&(h)->hash_mutexes[(idx) & (DBUF_MUTEXES-1)])
	typedef struct dbuf_hash_table {
	uint64_t hash_table_mask;
	dmu_buf_impl_t **hash_table;
	- kmutex_t hash_mutexes[DBUF_MUTEXES];
	+ kmutex_t hash_mutexes[DBUF_MUTEXES] ____cacheline_aligned;
	} dbuf_hash_table_t;

	typedef void (dbuf_prefetch_fn)(void , boolean_t);

	uint64_t dbuf_whichblock(const struct dnode *di, const int64_t level,
	const uint64_t offset);

	void dbuf_create_bonus(struct dnode *dn);
	int dbuf_spill_set_blksz(dmu_buf_t db, uint64_t blksz, dmu_tx_t tx);

	void dbuf_rm_spill(struct dnode dn, dmu_tx_t tx);

	dmu_buf_impl_t dbuf_hold(struct dnode dn, uint64_t blkid, void *tag);
	dmu_buf_impl_t dbuf_hold_level(struct dnode dn, int level, uint64_t blkid,
	void *tag);
	int dbuf_hold_impl(struct dnode *dn, uint8_t level, uint64_t blkid,
	boolean_t fail_sparse, boolean_t fail_uncached,
	void tag, dmu_buf_impl_t *dbp);

	int dbuf_prefetch_impl(struct dnode *dn, int64_t level, uint64_t blkid,
	zio_priority_t prio, arc_flags_t aflags, dbuf_prefetch_fn cb,
	void *arg);
	int dbuf_prefetch(struct dnode *dn, int64_t level, uint64_t blkid,
	zio_priority_t prio, arc_flags_t aflags);

	void dbuf_add_ref(dmu_buf_impl_t db, void tag);
	boolean_t dbuf_try_add_ref(dmu_buf_t db, objset_t os, uint64_t obj,
	uint64_t blkid, void *tag);
	uint64_t dbuf_refcount(dmu_buf_impl_t *db);

	void dbuf_rele(dmu_buf_impl_t db, void tag);
	void dbuf_rele_and_unlock(dmu_buf_impl_t db, void tag, boolean_t evicting);

	dmu_buf_impl_t dbuf_find(struct objset os, uint64_t object, uint8_t level,
	uint64_t blkid);

	int dbuf_read(dmu_buf_impl_t db, zio_t zio, uint32_t flags);
	void dmu_buf_will_not_fill(dmu_buf_t db, dmu_tx_t tx);
	void dmu_buf_will_fill(dmu_buf_t db, dmu_tx_t tx);
	void dmu_buf_fill_done(dmu_buf_t db, dmu_tx_t tx);
	void dbuf_assign_arcbuf(dmu_buf_impl_t db, arc_buf_t buf, dmu_tx_t *tx);
	dbuf_dirty_record_t dbuf_dirty(dmu_buf_impl_t db, dmu_tx_t *tx);
	dbuf_dirty_record_t dbuf_dirty_lightweight(dnode_t dn, uint64_t blkid,
	dmu_tx_t *tx);
	arc_buf_t dbuf_loan_arcbuf(dmu_buf_impl_t db);
	void dmu_buf_write_embedded(dmu_buf_t dbuf, void data,
	bp_embedded_type_t etype, enum zio_compress comp,
	int uncompressed_size, int compressed_size, int byteorder, dmu_tx_t *tx);

	int dmu_lightweight_write_by_dnode(dnode_t dn, uint64_t offset, abd_t abd,
	const struct zio_prop zp, enum zio_flag flags, dmu_tx_t tx);

	void dmu_buf_redact(dmu_buf_t dbuf, dmu_tx_t tx);
	void dbuf_destroy(dmu_buf_impl_t *db);

	void dbuf_unoverride(dbuf_dirty_record_t *dr);
	void dbuf_sync_list(list_t list, int level, dmu_tx_t tx);
	void dbuf_release_bp(dmu_buf_impl_t *db);
	db_lock_type_t dmu_buf_lock_parent(dmu_buf_impl_t db, krw_t rw, void tag);
	void dmu_buf_unlock_parent(dmu_buf_impl_t db, db_lock_type_t type, void tag);

	void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,
	struct dmu_tx *);

	void dbuf_new_size(dmu_buf_impl_t db, int size, dmu_tx_t tx);

	void dbuf_stats_init(dbuf_hash_table_t *hash);
	void dbuf_stats_destroy(void);

	int dbuf_dnode_findbp(dnode_t *dn, uint64_t level, uint64_t blkid,
	blkptr_t bp, uint16_t datablkszsec, uint8_t *indblkshift);

	#define DB_DNODE(_db) ((_db)->db_dnode_handle->dnh_dnode)
	#define DB_DNODE_LOCK(_db) ((_db)->db_dnode_handle->dnh_zrlock)
	#define DB_DNODE_ENTER(_db) (zrl_add(&DB_DNODE_LOCK(_db)))
	#define DB_DNODE_EXIT(_db) (zrl_remove(&DB_DNODE_LOCK(_db)))
	#define DB_DNODE_HELD(_db) (!zrl_is_zero(&DB_DNODE_LOCK(_db)))

	void dbuf_init(void);
	void dbuf_fini(void);

	boolean_t dbuf_is_metadata(dmu_buf_impl_t *db);

	static inline dbuf_dirty_record_t *
	dbuf_find_dirty_lte(dmu_buf_impl_t *db, uint64_t txg)
	{
	dbuf_dirty_record_t *dr;

	for (dr = list_head(&db->db_dirty_records);
	dr != NULL && dr->dr_txg > txg;
	dr = list_next(&db->db_dirty_records, dr))
	continue;
	return (dr);
	}

	static inline dbuf_dirty_record_t *
	dbuf_find_dirty_eq(dmu_buf_impl_t *db, uint64_t txg)
	{
	dbuf_dirty_record_t *dr;

	dr = dbuf_find_dirty_lte(db, txg);
	if (dr && dr->dr_txg == txg)
	return (dr);
	return (NULL);
	}

	#define DBUF_GET_BUFC_TYPE(_db) \
	(dbuf_is_metadata(_db) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)

	#define DBUF_IS_CACHEABLE(_db) \
	((_db)->db_objset->os_primary_cache == ZFS_CACHE_ALL \|\| \
	(dbuf_is_metadata(_db) && \
	((_db)->db_objset->os_primary_cache == ZFS_CACHE_METADATA)))

	#define DBUF_IS_L2CACHEABLE(_db) \
	((_db)->db_objset->os_secondary_cache == ZFS_CACHE_ALL \|\| \
	(dbuf_is_metadata(_db) && \
	((_db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA)))

	#define DNODE_LEVEL_IS_L2CACHEABLE(_dn, _level) \
	((_dn)->dn_objset->os_secondary_cache == ZFS_CACHE_ALL \|\| \
	(((_level) > 0 \|\| \
	DMU_OT_IS_METADATA((_dn)->dn_handle->dnh_dnode->dn_type)) && \
	((_dn)->dn_objset->os_secondary_cache == ZFS_CACHE_METADATA)))

	#ifdef ZFS_DEBUG

	/*
	* There should be a ## between the string literal and fmt, to make it
	* clear that we're joining two strings together, but gcc does not
	* support that preprocessor token.
	*/
	#define dprintf_dbuf(dbuf, fmt, ...) do { \
	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	char __db_buf[32]; \
	uint64_t __db_obj = (dbuf)->db.db_object; \
	if (__db_obj == DMU_META_DNODE_OBJECT) \
	- (void) strcpy(__db_buf, "mdn"); \
	+ (void) strlcpy(__db_buf, "mdn", sizeof (__db_buf)); \
	else \
	(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
	(u_longlong_t)__db_obj); \
	dprintf_ds((dbuf)->db_objset->os_dsl_dataset, \
	"obj=%s lvl=%u blkid=%lld " fmt, \
	__db_buf, (dbuf)->db_level, \
	(u_longlong_t)(dbuf)->db_blkid, __VA_ARGS__); \
	} \
	_NOTE(CONSTCOND) } while (0)

	#define dprintf_dbuf_bp(db, bp, fmt, ...) do { \
	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \
	snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, bp); \
	dprintf_dbuf(db, fmt " %s\n", __VA_ARGS__, __blkbuf); \
	kmem_free(__blkbuf, BP_SPRINTF_LEN); \
	} \
	_NOTE(CONSTCOND) } while (0)

	#define DBUF_VERIFY(db) dbuf_verify(db)

	#else

	#define dprintf_dbuf(db, fmt, ...)
	#define dprintf_dbuf_bp(db, bp, fmt, ...)
	#define DBUF_VERIFY(db)

	#endif


	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_DBUF_H */
	diff --git a/sys/contrib/openzfs/include/sys/dnode.h b/sys/contrib/openzfs/include/sys/dnode.h
	index de6492bb7618..2cdc5b8798ad 100644
	--- a/sys/contrib/openzfs/include/sys/dnode.h
	+++ b/sys/contrib/openzfs/include/sys/dnode.h
	@@ -1,627 +1,627 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	*/

	#ifndef _SYS_DNODE_H
	#define _SYS_DNODE_H

	#include <sys/zfs_context.h>
	#include <sys/avl.h>
	#include <sys/spa.h>
	#include <sys/txg.h>
	#include <sys/zio.h>
	#include <sys/zfs_refcount.h>
	#include <sys/dmu_zfetch.h>
	#include <sys/zrlock.h>
	#include <sys/multilist.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* dnode_hold() flags.
	*/
	#define DNODE_MUST_BE_ALLOCATED 1
	#define DNODE_MUST_BE_FREE 2
	#define DNODE_DRY_RUN 4

	/*
	* dnode_next_offset() flags.
	*/
	#define DNODE_FIND_HOLE 1
	#define DNODE_FIND_BACKWARDS 2
	#define DNODE_FIND_HAVELOCK 4

	/*
	* Fixed constants.
	*/
	#define DNODE_SHIFT 9 /* 512 bytes */
	#define DN_MIN_INDBLKSHIFT 12 /* 4k */
	/*
	* If we ever increase this value beyond 20, we need to revisit all logic that
	* does x << level * ebps to handle overflow. With a 1M indirect block size,
	* 4 levels of indirect blocks would not be able to guarantee addressing an
	* entire object, so 5 levels will be used, but 5 * (20 - 7) = 65.
	*/
	#define DN_MAX_INDBLKSHIFT 17 /* 128k */
	#define DNODE_BLOCK_SHIFT 14 /* 16k */
	#define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
	#define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
	#define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */

	/*
	* dnode id flags
	*
	* Note: a file will never ever have its ids moved from bonus->spill
	*/
	#define DN_ID_CHKED_BONUS 0x1
	#define DN_ID_CHKED_SPILL 0x2
	#define DN_ID_OLD_EXIST 0x4
	#define DN_ID_NEW_EXIST 0x8

	/*
	* Derived constants.
	*/
	#define DNODE_MIN_SIZE (1 << DNODE_SHIFT)
	#define DNODE_MAX_SIZE (1 << DNODE_BLOCK_SHIFT)
	#define DNODE_BLOCK_SIZE (1 << DNODE_BLOCK_SHIFT)
	#define DNODE_MIN_SLOTS (DNODE_MIN_SIZE >> DNODE_SHIFT)
	#define DNODE_MAX_SLOTS (DNODE_MAX_SIZE >> DNODE_SHIFT)
	#define DN_BONUS_SIZE(dnsize) ((dnsize) - DNODE_CORE_SIZE - \
	(1 << SPA_BLKPTRSHIFT))
	#define DN_SLOTS_TO_BONUSLEN(slots) DN_BONUS_SIZE((slots) << DNODE_SHIFT)
	#define DN_OLD_MAX_BONUSLEN (DN_BONUS_SIZE(DNODE_MIN_SIZE))
	#define DN_MAX_NBLKPTR ((DNODE_MIN_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
	#define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
	#define DN_ZERO_BONUSLEN (DN_BONUS_SIZE(DNODE_MAX_SIZE) + 1)
	#define DN_KILL_SPILLBLK (1)

	#define DN_SLOT_UNINIT ((void )NULL) / Uninitialized */
	#define DN_SLOT_FREE ((void )1UL) / Free slot */
	#define DN_SLOT_ALLOCATED ((void )2UL) / Allocated slot */
	#define DN_SLOT_INTERIOR ((void )3UL) / Interior allocated slot */
	#define DN_SLOT_IS_PTR(dn) ((void *)dn > DN_SLOT_INTERIOR)
	#define DN_SLOT_IS_VALID(dn) ((void *)dn != NULL)

	#define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
	#define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)

	/*
	* This is inaccurate if the indblkshift of the particular object is not the
	* max. But it's only used by userland to calculate the zvol reservation.
	*/
	#define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
	#define DNODES_PER_LEVEL (1ULL << DNODES_PER_LEVEL_SHIFT)

	#define DN_MAX_LEVELS (DIV_ROUND_UP(DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT, \
	DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT) + 1)

	#define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \
	(((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
	#define DN_MAX_BONUS_LEN(dnp) \
	((dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) ? \
	(uint8_t )DN_SPILL_BLKPTR(dnp) - (uint8_t )DN_BONUS(dnp) : \
	(uint8_t )(dnp + (dnp->dn_extra_slots + 1)) - (uint8_t )DN_BONUS(dnp))

	#define DN_USED_BYTES(dnp) (((dnp)->dn_flags & DNODE_FLAG_USED_BYTES) ? \
	(dnp)->dn_used : (dnp)->dn_used << SPA_MINBLOCKSHIFT)

	#define EPB(blkshift, typeshift) (1 << (blkshift - typeshift))

	struct dmu_buf_impl;
	struct objset;
	struct zio;

	enum dnode_dirtycontext {
	DN_UNDIRTIED,
	DN_DIRTY_OPEN,
	DN_DIRTY_SYNC
	};

	/* Is dn_used in bytes? if not, it's in multiples of SPA_MINBLOCKSIZE */
	#define DNODE_FLAG_USED_BYTES (1 << 0)
	#define DNODE_FLAG_USERUSED_ACCOUNTED (1 << 1)

	/* Does dnode have a SA spill blkptr in bonus? */
	#define DNODE_FLAG_SPILL_BLKPTR (1 << 2)

	/* User/Group/Project dnode accounting */
	#define DNODE_FLAG_USEROBJUSED_ACCOUNTED (1 << 3)

	/*
	* This mask defines the set of flags which are "portable", meaning
	* that they can be preserved when doing a raw encrypted zfs send.
	* Flags included in this mask will be protected by AAD when the block
	* of dnodes is encrypted.
	*/
	#define DNODE_CRYPT_PORTABLE_FLAGS_MASK (DNODE_FLAG_SPILL_BLKPTR)

	/*
	* VARIABLE-LENGTH (LARGE) DNODES
	*
	* The motivation for variable-length dnodes is to eliminate the overhead
	* associated with using spill blocks. Spill blocks are used to store
	* system attribute data (i.e. file metadata) that does not fit in the
	* dnode's bonus buffer. By allowing a larger bonus buffer area the use of
	* a spill block can be avoided. Spill blocks potentially incur an
	* additional read I/O for every dnode in a dnode block. As a worst case
	* example, reading 32 dnodes from a 16k dnode block and all of the spill
	* blocks could issue 33 separate reads. Now suppose those dnodes have size
	* 1024 and therefore don't need spill blocks. Then the worst case number
	* of blocks read is reduced from 33 to two--one per dnode block.
	*
	* ZFS-on-Linux systems that make heavy use of extended attributes benefit
	* from this feature. In particular, ZFS-on-Linux supports the xattr=sa
	* dataset property which allows file extended attribute data to be stored
	* in the dnode bonus buffer as an alternative to the traditional
	* directory-based format. Workloads such as SELinux and the Lustre
	* distributed filesystem often store enough xattr data to force spill
	* blocks when xattr=sa is in effect. Large dnodes may therefore provide a
	* performance benefit to such systems. Other use cases that benefit from
	* this feature include files with large ACLs and symbolic links with long
	* target names.
	*
	* The size of a dnode may be a multiple of 512 bytes up to the size of a
	* dnode block (currently 16384 bytes). The dn_extra_slots field of the
	* on-disk dnode_phys_t structure describes the size of the physical dnode
	* on disk. The field represents how many "extra" dnode_phys_t slots a
	* dnode consumes in its dnode block. This convention results in a value of
	* 0 for 512 byte dnodes which preserves on-disk format compatibility with
	* older software which doesn't support large dnodes.
	*
	* Similarly, the in-memory dnode_t structure has a dn_num_slots field
	* to represent the total number of dnode_phys_t slots consumed on disk.
	* Thus dn->dn_num_slots is 1 greater than the corresponding
	* dnp->dn_extra_slots. This difference in convention was adopted
	* because, unlike on-disk structures, backward compatibility is not a
	* concern for in-memory objects, so we used a more natural way to
	* represent size for a dnode_t.
	*
	* The default size for newly created dnodes is determined by the value of
	* the "dnodesize" dataset property. By default the property is set to
	* "legacy" which is compatible with older software. Setting the property
	* to "auto" will allow the filesystem to choose the most suitable dnode
	* size. Currently this just sets the default dnode size to 1k, but future
	* code improvements could dynamically choose a size based on observed
	* workload patterns. Dnodes of varying sizes can coexist within the same
	* dataset and even within the same dnode block.
	*/

	typedef struct dnode_phys {
	uint8_t dn_type; /* dmu_object_type_t */
	uint8_t dn_indblkshift; /* ln2(indirect block size) */
	uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
	uint8_t dn_nblkptr; /* length of dn_blkptr */
	uint8_t dn_bonustype; /* type of data in bonus buffer */
	uint8_t dn_checksum; /* ZIO_CHECKSUM type */
	uint8_t dn_compress; /* ZIO_COMPRESS type */
	uint8_t dn_flags; /* DNODE_FLAG_* */
	uint16_t dn_datablkszsec; /* data block size in 512b sectors */
	uint16_t dn_bonuslen; /* length of dn_bonus */
	uint8_t dn_extra_slots; /* # of subsequent slots consumed */
	uint8_t dn_pad2[3];

	/* accounting is protected by dn_dirty_mtx */
	uint64_t dn_maxblkid; /* largest allocated block ID */
	uint64_t dn_used; /* bytes (or sectors) of disk space */

	/*
	* Both dn_pad2 and dn_pad3 are protected by the block's MAC. This
	* allows us to protect any fields that might be added here in the
	* future. In either case, developers will want to check
	* zio_crypt_init_uios_dnode() and zio_crypt_do_dnode_hmac_updates()
	* to ensure the new field is being protected and updated properly.
	*/
	uint64_t dn_pad3[4];

	/*
	* The tail region is 448 bytes for a 512 byte dnode, and
	* correspondingly larger for larger dnode sizes. The spill
	* block pointer, when present, is always at the end of the tail
	* region. There are three ways this space may be used, using
	* a 512 byte dnode for this diagram:
	*
	* 0 64 128 192 256 320 384 448 (offset)
	* +---------------+---------------+---------------+-------+
	* \| dn_blkptr[0] \| dn_blkptr[1] \| dn_blkptr[2] \| / \|
	* +---------------+---------------+---------------+-------+
	* \| dn_blkptr[0] \| dn_bonus[0..319] \|
	* +---------------+-----------------------+---------------+
	* \| dn_blkptr[0] \| dn_bonus[0..191] \| dn_spill \|
	* +---------------+-----------------------+---------------+
	*/
	union {
	blkptr_t dn_blkptr[1+DN_OLD_MAX_BONUSLEN/sizeof (blkptr_t)];
	struct {
	blkptr_t __dn_ignore1;
	uint8_t dn_bonus[DN_OLD_MAX_BONUSLEN];
	};
	struct {
	blkptr_t __dn_ignore2;
	uint8_t __dn_ignore3[DN_OLD_MAX_BONUSLEN -
	sizeof (blkptr_t)];
	blkptr_t dn_spill;
	};
	};
	} dnode_phys_t;

	#define DN_SPILL_BLKPTR(dnp) ((blkptr_t )((char )(dnp) + \
	(((dnp)->dn_extra_slots + 1) << DNODE_SHIFT) - (1 << SPA_BLKPTRSHIFT)))

	struct dnode {
	/*
	* Protects the structure of the dnode, including the number of levels
	* of indirection (dn_nlevels), dn_maxblkid, and dn_next_*
	*/
	krwlock_t dn_struct_rwlock;

	/* Our link on dn_objset->os_dnodes list; protected by os_lock. */
	list_node_t dn_link;

	/* immutable: */
	struct objset *dn_objset;
	uint64_t dn_object;
	struct dmu_buf_impl *dn_dbuf;
	struct dnode_handle *dn_handle;
	dnode_phys_t dn_phys; / pointer into dn->dn_dbuf->db.db_data */

	/*
	* Copies of stuff in dn_phys. They're valid in the open
	* context (eg. even before the dnode is first synced).
	* Where necessary, these are protected by dn_struct_rwlock.
	*/
	dmu_object_type_t dn_type; /* object type */
	uint16_t dn_bonuslen; /* bonus length */
	uint8_t dn_bonustype; /* bonus type */
	uint8_t dn_nblkptr; /* number of blkptrs (immutable) */
	uint8_t dn_checksum; /* ZIO_CHECKSUM type */
	uint8_t dn_compress; /* ZIO_COMPRESS type */
	uint8_t dn_nlevels;
	uint8_t dn_indblkshift;
	uint8_t dn_datablkshift; /* zero if blksz not power of 2! */
	uint8_t dn_moved; /* Has this dnode been moved? */
	uint16_t dn_datablkszsec; /* in 512b sectors */
	uint32_t dn_datablksz; /* in bytes */
	uint64_t dn_maxblkid;
	uint8_t dn_next_type[TXG_SIZE];
	uint8_t dn_num_slots; /* metadnode slots consumed on disk */
	uint8_t dn_next_nblkptr[TXG_SIZE];
	uint8_t dn_next_nlevels[TXG_SIZE];
	uint8_t dn_next_indblkshift[TXG_SIZE];
	uint8_t dn_next_bonustype[TXG_SIZE];
	uint8_t dn_rm_spillblk[TXG_SIZE]; /* for removing spill blk */
	uint16_t dn_next_bonuslen[TXG_SIZE];
	uint32_t dn_next_blksz[TXG_SIZE]; /* next block size in bytes */
	uint64_t dn_next_maxblkid[TXG_SIZE]; /* next maxblkid in bytes */

	/* protected by dn_dbufs_mtx; declared here to fill 32-bit hole */
	uint32_t dn_dbufs_count; /* count of dn_dbufs */

	/* protected by os_lock: */
	multilist_node_t dn_dirty_link[TXG_SIZE]; /* next on dataset's dirty */

	/* protected by dn_mtx: */
	kmutex_t dn_mtx;
	list_t dn_dirty_records[TXG_SIZE];
	struct range_tree *dn_free_ranges[TXG_SIZE];
	uint64_t dn_allocated_txg;
	uint64_t dn_free_txg;
	uint64_t dn_assigned_txg;
	uint64_t dn_dirty_txg; /* txg dnode was last dirtied */
	kcondvar_t dn_notxholds;
	kcondvar_t dn_nodnholds;
	enum dnode_dirtycontext dn_dirtyctx;
	void dn_dirtyctx_firstset; / dbg: contents meaningless */

	/* protected by own devices */
	zfs_refcount_t dn_tx_holds;
	zfs_refcount_t dn_holds;

	kmutex_t dn_dbufs_mtx;
	/*
	* Descendent dbufs, ordered by dbuf_compare. Note that dn_dbufs
	* can contain multiple dbufs of the same (level, blkid) when a
	* dbuf is marked DB_EVICTING without being removed from
	* dn_dbufs. To maintain the avl invariant that there cannot be
	* duplicate entries, we order the dbufs by an arbitrary value -
	* their address in memory. This means that dn_dbufs cannot be used to
	* directly look up a dbuf. Instead, callers must use avl_walk, have
	* a reference to the dbuf, or look up a non-existent node with
	* db_state = DB_SEARCH (see dbuf_free_range for an example).
	*/
	avl_tree_t dn_dbufs;

	/* protected by dn_struct_rwlock */
	struct dmu_buf_impl dn_bonus; / bonus buffer dbuf */

	boolean_t dn_have_spill; /* have spill or are spilling */

	/* parent IO for current sync write */
	zio_t *dn_zio;

	/* used in syncing context */
	uint64_t dn_oldused; /* old phys used bytes */
	uint64_t dn_oldflags; /* old phys dn_flags */
	uint64_t dn_olduid, dn_oldgid, dn_oldprojid;
	uint64_t dn_newuid, dn_newgid, dn_newprojid;
	int dn_id_flags;

	/* holds prefetch structure */
	struct zfetch dn_zfetch;
	};

	/*
	* Since AVL already has embedded element counter, use dn_dbufs_count
	* only for dbufs not counted there (bonus buffers) and just add them.
	*/
	#define DN_DBUFS_COUNT(dn) ((dn)->dn_dbufs_count + \
	avl_numnodes(&(dn)->dn_dbufs))

	/*
	* We use this (otherwise unused) bit to indicate if the value of
	* dn_next_maxblkid[txgoff] is valid to use in dnode_sync().
	*/
	#define DMU_NEXT_MAXBLKID_SET (1ULL << 63)

	/*
	* Adds a level of indirection between the dbuf and the dnode to avoid
	* iterating descendent dbufs in dnode_move(). Handles are not allocated
	* individually, but as an array of child dnodes in dnode_hold_impl().
	*/
	typedef struct dnode_handle {
	/* Protects dnh_dnode from modification by dnode_move(). */
	zrlock_t dnh_zrlock;
	dnode_t *dnh_dnode;
	} dnode_handle_t;

	typedef struct dnode_children {
	dmu_buf_user_t dnc_dbu; /* User evict data */
	size_t dnc_count; /* number of children */
	dnode_handle_t dnc_children[]; /* sized dynamically */
	} dnode_children_t;

	typedef struct free_range {
	avl_node_t fr_node;
	uint64_t fr_blkid;
	uint64_t fr_nblks;
	} free_range_t;

	void dnode_special_open(struct objset dd, dnode_phys_t dnp,
	uint64_t object, dnode_handle_t *dnh);
	void dnode_special_close(dnode_handle_t *dnh);

	void dnode_setbonuslen(dnode_t dn, int newsize, dmu_tx_t tx);
	void dnode_setbonus_type(dnode_t dn, dmu_object_type_t, dmu_tx_t tx);
	void dnode_rm_spill(dnode_t dn, dmu_tx_t tx);

	int dnode_hold(struct objset *dd, uint64_t object,
	void ref, dnode_t *dnp);
	int dnode_hold_impl(struct objset *dd, uint64_t object, int flag, int dn_slots,
	void ref, dnode_t *dnp);
	boolean_t dnode_add_ref(dnode_t dn, void ref);
	void dnode_rele(dnode_t dn, void ref);
	void dnode_rele_and_unlock(dnode_t dn, void tag, boolean_t evicting);
	int dnode_try_claim(objset_t *os, uint64_t object, int slots);
	void dnode_setdirty(dnode_t dn, dmu_tx_t tx);
	void dnode_set_dirtyctx(dnode_t dn, dmu_tx_t tx, void *tag);
	void dnode_sync(dnode_t dn, dmu_tx_t tx);
	void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs,
	dmu_object_type_t bonustype, int bonuslen, int dn_slots, dmu_tx_t *tx);
	void dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize,
	dmu_object_type_t bonustype, int bonuslen, int dn_slots,
	boolean_t keep_spill, dmu_tx_t *tx);
	void dnode_free(dnode_t dn, dmu_tx_t tx);
	void dnode_byteswap(dnode_phys_t *dnp);
	void dnode_buf_byteswap(void *buf, size_t size);
	void dnode_verify(dnode_t *dn);
	int dnode_set_nlevels(dnode_t dn, int nlevels, dmu_tx_t tx);
	int dnode_set_blksz(dnode_t dn, uint64_t size, int ibs, dmu_tx_t tx);
	void dnode_free_range(dnode_t dn, uint64_t off, uint64_t len, dmu_tx_t tx);
	void dnode_diduse_space(dnode_t *dn, int64_t space);
	void dnode_new_blkid(dnode_t dn, uint64_t blkid, dmu_tx_t tx,
	boolean_t have_read, boolean_t force);
	uint64_t dnode_block_freed(dnode_t *dn, uint64_t blkid);
	void dnode_init(void);
	void dnode_fini(void);
	int dnode_next_offset(dnode_t dn, int flags, uint64_t off,
	int minlvl, uint64_t blkfill, uint64_t txg);
	void dnode_evict_dbufs(dnode_t *dn);
	void dnode_evict_bonus(dnode_t *dn);
	void dnode_free_interior_slots(dnode_t *dn);

	#define DNODE_IS_DIRTY(_dn) \
	((_dn)->dn_dirty_txg >= spa_syncing_txg((_dn)->dn_objset->os_spa))

	#define DNODE_IS_CACHEABLE(_dn) \
	((_dn)->dn_objset->os_primary_cache == ZFS_CACHE_ALL \|\| \
	(DMU_OT_IS_METADATA((_dn)->dn_type) && \
	(_dn)->dn_objset->os_primary_cache == ZFS_CACHE_METADATA))

	#define DNODE_META_IS_CACHEABLE(_dn) \
	((_dn)->dn_objset->os_primary_cache == ZFS_CACHE_ALL \|\| \
	(_dn)->dn_objset->os_primary_cache == ZFS_CACHE_METADATA)

	/*
	* Used for dnodestats kstat.
	*/
	typedef struct dnode_stats {
	/*
	* Number of failed attempts to hold a meta dnode dbuf.
	*/
	kstat_named_t dnode_hold_dbuf_hold;
	/*
	* Number of failed attempts to read a meta dnode dbuf.
	*/
	kstat_named_t dnode_hold_dbuf_read;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) was able
	* to hold the requested object number which was allocated. This is
	* the common case when looking up any allocated object number.
	*/
	kstat_named_t dnode_hold_alloc_hits;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) was not
	* able to hold the request object number because it was not allocated.
	*/
	kstat_named_t dnode_hold_alloc_misses;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) was not
	* able to hold the request object number because the object number
	* refers to an interior large dnode slot.
	*/
	kstat_named_t dnode_hold_alloc_interior;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) needed
	* to retry acquiring slot zrl locks due to contention.
	*/
	kstat_named_t dnode_hold_alloc_lock_retry;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) did not
	* need to create the dnode because another thread did so after
	* dropping the read lock but before acquiring the write lock.
	*/
	kstat_named_t dnode_hold_alloc_lock_misses;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_ALLOCATED) found
	* a free dnode instantiated by dnode_create() but not yet allocated
	* by dnode_allocate().
	*/
	kstat_named_t dnode_hold_alloc_type_none;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_FREE) was able
	* to hold the requested range of free dnode slots.
	*/
	kstat_named_t dnode_hold_free_hits;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_FREE) was not
	* able to hold the requested range of free dnode slots because
	* at least one slot was allocated.
	*/
	kstat_named_t dnode_hold_free_misses;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_FREE) was not
	* able to hold the requested range of free dnode slots because
	* after acquiring the zrl lock at least one slot was allocated.
	*/
	kstat_named_t dnode_hold_free_lock_misses;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_FREE) needed
	* to retry acquiring slot zrl locks due to contention.
	*/
	kstat_named_t dnode_hold_free_lock_retry;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_FREE) requested
	* a range of dnode slots which were held by another thread.
	*/
	kstat_named_t dnode_hold_free_refcount;
	/*
	* Number of times dnode_hold(..., DNODE_MUST_BE_FREE) requested
	* a range of dnode slots which would overflow the dnode_phys_t.
	*/
	kstat_named_t dnode_hold_free_overflow;
	/*
	* Number of times dnode_free_interior_slots() needed to retry
	* acquiring a slot zrl lock due to contention.
	*/
	kstat_named_t dnode_free_interior_lock_retry;
	/*
	* Number of new dnodes allocated by dnode_allocate().
	*/
	kstat_named_t dnode_allocate;
	/*
	* Number of dnodes re-allocated by dnode_reallocate().
	*/
	kstat_named_t dnode_reallocate;
	/*
	* Number of meta dnode dbufs evicted.
	*/
	kstat_named_t dnode_buf_evict;
	/*
	* Number of times dmu_object_alloc*() reached the end of the existing
	* object ID chunk and advanced to a new one.
	*/
	kstat_named_t dnode_alloc_next_chunk;
	/*
	* Number of times multiple threads attempted to allocate a dnode
	* from the same block of free dnodes.
	*/
	kstat_named_t dnode_alloc_race;
	/*
	* Number of times dmu_object_alloc*() was forced to advance to the
	* next meta dnode dbuf due to an error from dmu_object_next().
	*/
	kstat_named_t dnode_alloc_next_block;
	/*
	* Statistics for tracking dnodes which have been moved.
	*/
	kstat_named_t dnode_move_invalid;
	kstat_named_t dnode_move_recheck1;
	kstat_named_t dnode_move_recheck2;
	kstat_named_t dnode_move_special;
	kstat_named_t dnode_move_handle;
	kstat_named_t dnode_move_rwlock;
	kstat_named_t dnode_move_active;
	} dnode_stats_t;

	extern dnode_stats_t dnode_stats;

	#define DNODE_STAT_INCR(stat, val) \
	atomic_add_64(&dnode_stats.stat.value.ui64, (val));
	#define DNODE_STAT_BUMP(stat) \
	DNODE_STAT_INCR(stat, 1);

	#ifdef ZFS_DEBUG

	#define dprintf_dnode(dn, fmt, ...) do { \
	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	char __db_buf[32]; \
	uint64_t __db_obj = (dn)->dn_object; \
	if (__db_obj == DMU_META_DNODE_OBJECT) \
	- (void) strcpy(__db_buf, "mdn"); \
	+ (void) strlcpy(__db_buf, "mdn", sizeof (__db_buf)); \
	else \
	(void) snprintf(__db_buf, sizeof (__db_buf), "%lld", \
	(u_longlong_t)__db_obj);\
	dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \
	__db_buf, __VA_ARGS__); \
	} \
	_NOTE(CONSTCOND) } while (0)

	#define DNODE_VERIFY(dn) dnode_verify(dn)
	#define FREE_VERIFY(db, start, end, tx) free_verify(db, start, end, tx)

	#else

	#define dprintf_dnode(db, fmt, ...)
	#define DNODE_VERIFY(dn)
	#define FREE_VERIFY(db, start, end, tx)

	#endif

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_DNODE_H */
	diff --git a/sys/contrib/openzfs/include/sys/dsl_dir.h b/sys/contrib/openzfs/include/sys/dsl_dir.h
	index 7cf5093c2c30..d635b3140423 100644
	--- a/sys/contrib/openzfs/include/sys/dsl_dir.h
	+++ b/sys/contrib/openzfs/include/sys/dsl_dir.h
	@@ -1,227 +1,230 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2014, Joyent, Inc. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	*/

	#ifndef _SYS_DSL_DIR_H
	#define _SYS_DSL_DIR_H

	#include <sys/dmu.h>
	#include <sys/dsl_deadlist.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_synctask.h>
	#include <sys/zfs_refcount.h>
	#include <sys/zfs_context.h>
	#include <sys/dsl_crypt.h>
	#include <sys/bplist.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	struct dsl_dataset;
	struct zthr;
	/*
	* DD_FIELD_* are strings that are used in the "extensified" dsl_dir zap object.
	* They should be of the format <reverse-dns>:<field>.
	*/

	#define DD_FIELD_FILESYSTEM_COUNT "com.joyent:filesystem_count"
	#define DD_FIELD_SNAPSHOT_COUNT "com.joyent:snapshot_count"
	#define DD_FIELD_CRYPTO_KEY_OBJ "com.datto:crypto_key_obj"
	#define DD_FIELD_LIVELIST "com.delphix:livelist"

	typedef enum dd_used {
	DD_USED_HEAD,
	DD_USED_SNAP,
	DD_USED_CHILD,
	DD_USED_CHILD_RSRV,
	DD_USED_REFRSRV,
	DD_USED_NUM
	} dd_used_t;

	#define DD_FLAG_USED_BREAKDOWN (1<<0)

	typedef struct dsl_dir_phys {
	uint64_t dd_creation_time; /* not actually used */
	uint64_t dd_head_dataset_obj;
	uint64_t dd_parent_obj;
	uint64_t dd_origin_obj;
	uint64_t dd_child_dir_zapobj;
	/*
	* how much space our children are accounting for; for leaf
	* datasets, == physical space used by fs + snaps
	*/
	uint64_t dd_used_bytes;
	uint64_t dd_compressed_bytes;
	uint64_t dd_uncompressed_bytes;
	/* Administrative quota setting */
	uint64_t dd_quota;
	/* Administrative reservation setting */
	uint64_t dd_reserved;
	uint64_t dd_props_zapobj;
	uint64_t dd_deleg_zapobj; /* dataset delegation permissions */
	uint64_t dd_flags;
	uint64_t dd_used_breakdown[DD_USED_NUM];
	uint64_t dd_clones; /* dsl_dir objects */
	uint64_t dd_pad[13]; /* pad out to 256 bytes for good measure */
	} dsl_dir_phys_t;

	struct dsl_dir {
	dmu_buf_user_t dd_dbu;

	/* These are immutable; no lock needed: */
	uint64_t dd_object;
	uint64_t dd_crypto_obj;
	dsl_pool_t *dd_pool;

	/* Stable until user eviction; no lock needed: */
	dmu_buf_t *dd_dbuf;

	/* protected by lock on pool's dp_dirty_dirs list */
	txg_node_t dd_dirty_link;

	/* protected by dp_config_rwlock */
	dsl_dir_t *dd_parent;

	/* Protected by dd_lock */
	kmutex_t dd_lock;
	list_t dd_props; /* list of dsl_prop_record_t's */
	inode_timespec_t dd_snap_cmtime; /* last snapshot namespace change */
	uint64_t dd_origin_txg;

	/* gross estimate of space used by in-flight tx's */
	uint64_t dd_tempreserved[TXG_SIZE];
	/* amount of space we expect to write; == amount of dirty data */
	int64_t dd_space_towrite[TXG_SIZE];

	dsl_deadlist_t dd_livelist;
	bplist_t dd_pending_frees;
	bplist_t dd_pending_allocs;

	kmutex_t dd_activity_lock;
	kcondvar_t dd_activity_cv;
	boolean_t dd_activity_cancelled;
	uint64_t dd_activity_waiters;

	/* protected by dd_lock; keep at end of struct for better locality */
	char dd_myname[ZFS_MAX_DATASET_NAME_LEN];
	};

	static inline dsl_dir_phys_t *
	dsl_dir_phys(dsl_dir_t *dd)
	{
	return (dd->dd_dbuf->db_data);
	}

	void dsl_dir_rele(dsl_dir_t dd, void tag);
	void dsl_dir_async_rele(dsl_dir_t dd, void tag);
	int dsl_dir_hold(dsl_pool_t dp, const char name, void *tag,
	dsl_dir_t , const char tail);
	int dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
	const char tail, void tag, dsl_dir_t **);
	void dsl_dir_name(dsl_dir_t dd, char buf);
	int dsl_dir_namelen(dsl_dir_t *dd);
	uint64_t dsl_dir_create_sync(dsl_pool_t dp, dsl_dir_t pds,
	const char name, dmu_tx_t tx);

	uint64_t dsl_dir_get_used(dsl_dir_t *dd);
	uint64_t dsl_dir_get_compressed(dsl_dir_t *dd);
	uint64_t dsl_dir_get_quota(dsl_dir_t *dd);
	uint64_t dsl_dir_get_reservation(dsl_dir_t *dd);
	uint64_t dsl_dir_get_compressratio(dsl_dir_t *dd);
	uint64_t dsl_dir_get_logicalused(dsl_dir_t *dd);
	uint64_t dsl_dir_get_usedsnap(dsl_dir_t *dd);
	uint64_t dsl_dir_get_usedds(dsl_dir_t *dd);
	uint64_t dsl_dir_get_usedrefreserv(dsl_dir_t *dd);
	uint64_t dsl_dir_get_usedchild(dsl_dir_t *dd);
	void dsl_dir_get_origin(dsl_dir_t dd, char buf);
	int dsl_dir_get_filesystem_count(dsl_dir_t dd, uint64_t count);
	int dsl_dir_get_snapshot_count(dsl_dir_t dd, uint64_t count);

	void dsl_dir_stats(dsl_dir_t dd, nvlist_t nv);
	uint64_t dsl_dir_space_available(dsl_dir_t *dd,
	dsl_dir_t *ancestor, int64_t delta, int ondiskonly);
	void dsl_dir_dirty(dsl_dir_t dd, dmu_tx_t tx);
	void dsl_dir_sync(dsl_dir_t dd, dmu_tx_t tx);
	int dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t mem,
	uint64_t asize, boolean_t netfree, void *tr_cookiep, dmu_tx_t tx);
	void dsl_dir_tempreserve_clear(void tr_cookie, dmu_tx_t tx);
	void dsl_dir_willuse_space(dsl_dir_t dd, int64_t space, dmu_tx_t tx);
	void dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
	int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx);
	void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
	dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
	+void dsl_dir_diduse_transfer_space(dsl_dir_t *dd, int64_t used,
	+ int64_t compressed, int64_t uncompressed, int64_t tonew,
	+ dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
	int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
	uint64_t quota);
	int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
	uint64_t reservation);
	int dsl_dir_activate_fs_ss_limit(const char *);
	int dsl_fs_ss_limit_check(dsl_dir_t , uint64_t, zfs_prop_t, dsl_dir_t ,
	cred_t , proc_t );
	void dsl_fs_ss_count_adjust(dsl_dir_t , int64_t, const char , dmu_tx_t *);
	int dsl_dir_rename(const char oldname, const char newname);
	int dsl_dir_transfer_possible(dsl_dir_t sdd, dsl_dir_t tdd,
	uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t , proc_t );
	boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
	void dsl_dir_new_refreservation(dsl_dir_t dd, struct dsl_dataset ds,
	uint64_t reservation, cred_t cr, dmu_tx_t tx);
	void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
	inode_timespec_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
	void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value,
	dmu_tx_t *tx);
	void dsl_dir_zapify(dsl_dir_t dd, dmu_tx_t tx);
	boolean_t dsl_dir_is_zapified(dsl_dir_t *dd);
	void dsl_dir_livelist_open(dsl_dir_t *dd, uint64_t obj);
	void dsl_dir_livelist_close(dsl_dir_t *dd);
	void dsl_dir_remove_livelist(dsl_dir_t dd, dmu_tx_t tx, boolean_t total);
	int dsl_dir_wait(dsl_dir_t dd, dsl_dataset_t ds, zfs_wait_activity_t activity,
	boolean_t *waited);
	void dsl_dir_cancel_waiters(dsl_dir_t *dd);

	/* internal reserved dir name */
	#define MOS_DIR_NAME "$MOS"
	#define ORIGIN_DIR_NAME "$ORIGIN"
	#define FREE_DIR_NAME "$FREE"
	#define LEAK_DIR_NAME "$LEAK"

	#ifdef ZFS_DEBUG
	#define dprintf_dd(dd, fmt, ...) do { \
	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \
	dsl_dir_name(dd, __ds_name); \
	dprintf("dd=%s " fmt, __ds_name, __VA_ARGS__); \
	kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \
	} \
	_NOTE(CONSTCOND) } while (0)
	#else
	#define dprintf_dd(dd, fmt, ...)
	#endif

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_DSL_DIR_H */
	diff --git a/sys/contrib/openzfs/include/sys/fm/util.h b/sys/contrib/openzfs/include/sys/fm/util.h
	index 56ba8798beb0..5fb6d1d6072b 100644
	--- a/sys/contrib/openzfs/include/sys/fm/util.h
	+++ b/sys/contrib/openzfs/include/sys/fm/util.h
	@@ -1,120 +1,121 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
	*/

	#ifndef _SYS_FM_UTIL_H
	#define _SYS_FM_UTIL_H

	#ifdef __cplusplus
	extern "C" {
	#endif

	#include <sys/nvpair.h>
	+#include <sys/zfs_file.h>

	/*
	* Shared user/kernel definitions for class length, error channel name,
	* and kernel event publisher string.
	*/
	#define FM_MAX_CLASS 100
	#define FM_ERROR_CHAN "com.sun:fm:error"
	#define FM_PUB "fm"

	/*
	* ereport dump device transport support
	*
	* Ereports are written out to the dump device at a proscribed offset from the
	* end, similar to in-transit log messages. The ereports are represented as a
	* erpt_dump_t header followed by ed_size bytes of packed native nvlist data.
	*
	* NOTE: All of these constants and the header must be defined so they have the
	* same representation for both 32-bit and 64-bit producers and consumers.
	*/
	#define ERPT_MAGIC 0xf00d4eddU
	#define ERPT_MAX_ERRS 16
	#define ERPT_DATA_SZ (6 * 1024)
	#define ERPT_EVCH_MAX 256
	#define ERPT_HIWAT 64

	typedef struct erpt_dump {
	uint32_t ed_magic; /* ERPT_MAGIC or zero to indicate end */
	uint32_t ed_chksum; /* checksum32() of packed nvlist data */
	uint32_t ed_size; /* ereport (nvl) fixed buf size */
	uint32_t ed_pad; /* reserved for future use */
	hrtime_t ed_hrt_nsec; /* hrtime of this ereport */
	hrtime_t ed_hrt_base; /* hrtime sample corresponding to ed_tod_base */
	struct {
	uint64_t sec; /* seconds since gettimeofday() Epoch */
	uint64_t nsec; /* nanoseconds past ed_tod_base.sec */
	} ed_tod_base;
	} erpt_dump_t;

	#ifdef _KERNEL

	#define ZEVENT_SHUTDOWN 0x1

	typedef void zevent_cb_t(nvlist_t , nvlist_t );

	typedef struct zevent_s {
	nvlist_t ev_nvl; / protected by the zevent_lock */
	nvlist_t ev_detector; / " */
	list_t ev_ze_list; /* " */
	list_node_t ev_node; /* " */
	zevent_cb_t ev_cb; / " */
	uint64_t ev_eid;
	} zevent_t;

	typedef struct zfs_zevent {
	zevent_t ze_zevent; / protected by the zevent_lock */
	list_node_t ze_node; /* " */
	uint64_t ze_dropped; /* " */
	} zfs_zevent_t;

	extern void fm_init(void);
	extern void fm_fini(void);
	extern void zfs_zevent_post_cb(nvlist_t nvl, nvlist_t detector);
	extern int zfs_zevent_post(nvlist_t , nvlist_t , zevent_cb_t *);
	extern void zfs_zevent_drain_all(int *);
	-extern int zfs_zevent_fd_hold(int, minor_t , zfs_zevent_t *);
	-extern void zfs_zevent_fd_rele(int);
	+extern zfs_file_t zfs_zevent_fd_hold(int, minor_t , zfs_zevent_t **);
	+extern void zfs_zevent_fd_rele(zfs_file_t *);
	extern int zfs_zevent_next(zfs_zevent_t , nvlist_t , uint64_t , uint64_t *);
	extern int zfs_zevent_wait(zfs_zevent_t *);
	extern int zfs_zevent_seek(zfs_zevent_t *, uint64_t);
	extern void zfs_zevent_init(zfs_zevent_t **);
	extern void zfs_zevent_destroy(zfs_zevent_t *);

	extern void zfs_zevent_track_duplicate(void);
	extern void zfs_ereport_init(void);
	extern void zfs_ereport_fini(void);
	#else

	static inline void fm_init(void) { }
	static inline void fm_fini(void) { }

	#endif /* _KERNEL */

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_FM_UTIL_H */
	diff --git a/sys/contrib/openzfs/include/sys/metaslab_impl.h b/sys/contrib/openzfs/include/sys/metaslab_impl.h
	index 9924c3ba0eaa..adf4c03a20db 100644
	--- a/sys/contrib/openzfs/include/sys/metaslab_impl.h
	+++ b/sys/contrib/openzfs/include/sys/metaslab_impl.h
	@@ -1,572 +1,572 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	/*
	* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
	*/

	#ifndef _SYS_METASLAB_IMPL_H
	#define _SYS_METASLAB_IMPL_H

	#include <sys/metaslab.h>
	#include <sys/space_map.h>
	#include <sys/range_tree.h>
	#include <sys/vdev.h>
	#include <sys/txg.h>
	#include <sys/avl.h>
	#include <sys/multilist.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* Metaslab allocation tracing record.
	*/
	typedef struct metaslab_alloc_trace {
	list_node_t mat_list_node;
	metaslab_group_t *mat_mg;
	metaslab_t *mat_msp;
	uint64_t mat_size;
	uint64_t mat_weight;
	uint32_t mat_dva_id;
	uint64_t mat_offset;
	int mat_allocator;
	} metaslab_alloc_trace_t;

	/*
	* Used by the metaslab allocation tracing facility to indicate
	* error conditions. These errors are stored to the offset member
	* of the metaslab_alloc_trace_t record and displayed by mdb.
	*/
	typedef enum trace_alloc_type {
	TRACE_ALLOC_FAILURE = -1ULL,
	TRACE_TOO_SMALL = -2ULL,
	TRACE_FORCE_GANG = -3ULL,
	TRACE_NOT_ALLOCATABLE = -4ULL,
	TRACE_GROUP_FAILURE = -5ULL,
	TRACE_ENOSPC = -6ULL,
	TRACE_CONDENSING = -7ULL,
	TRACE_VDEV_ERROR = -8ULL,
	TRACE_DISABLED = -9ULL,
	} trace_alloc_type_t;

	#define METASLAB_WEIGHT_PRIMARY (1ULL << 63)
	#define METASLAB_WEIGHT_SECONDARY (1ULL << 62)
	#define METASLAB_WEIGHT_CLAIM (1ULL << 61)
	#define METASLAB_WEIGHT_TYPE (1ULL << 60)
	#define METASLAB_ACTIVE_MASK \
	(METASLAB_WEIGHT_PRIMARY \| METASLAB_WEIGHT_SECONDARY \| \
	METASLAB_WEIGHT_CLAIM)

	/*
	* The metaslab weight is used to encode the amount of free space in a
	* metaslab, such that the "best" metaslab appears first when sorting the
	* metaslabs by weight. The weight (and therefore the "best" metaslab) can
	* be determined in two different ways: by computing a weighted sum of all
	* the free space in the metaslab (a space based weight) or by counting only
	* the free segments of the largest size (a segment based weight). We prefer
	* the segment based weight because it reflects how the free space is
	* comprised, but we cannot always use it -- legacy pools do not have the
	* space map histogram information necessary to determine the largest
	* contiguous regions. Pools that have the space map histogram determine
	* the segment weight by looking at each bucket in the histogram and
	* determining the free space whose size in bytes is in the range:
	* [2^i, 2^(i+1))
	* We then encode the largest index, i, that contains regions into the
	* segment-weighted value.
	*
	* Space-based weight:
	*
	* 64 56 48 40 32 24 16 8 0
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* \|PSC1\| weighted-free space \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	*
	* PS - indicates primary and secondary activation
	* C - indicates activation for claimed block zio
	* space - the fragmentation-weighted space
	*
	* Segment-based weight:
	*
	* 64 56 48 40 32 24 16 8 0
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* \|PSC0\| idx\| count of segments in region \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	*
	* PS - indicates primary and secondary activation
	* C - indicates activation for claimed block zio
	* idx - index for the highest bucket in the histogram
	* count - number of segments in the specified bucket
	*/
	#define WEIGHT_GET_ACTIVE(weight) BF64_GET((weight), 61, 3)
	#define WEIGHT_SET_ACTIVE(weight, x) BF64_SET((weight), 61, 3, x)

	#define WEIGHT_IS_SPACEBASED(weight) \
	((weight) == 0 \|\| BF64_GET((weight), 60, 1))
	#define WEIGHT_SET_SPACEBASED(weight) BF64_SET((weight), 60, 1, 1)

	/*
	* These macros are only applicable to segment-based weighting.
	*/
	#define WEIGHT_GET_INDEX(weight) BF64_GET((weight), 54, 6)
	#define WEIGHT_SET_INDEX(weight, x) BF64_SET((weight), 54, 6, x)
	#define WEIGHT_GET_COUNT(weight) BF64_GET((weight), 0, 54)
	#define WEIGHT_SET_COUNT(weight, x) BF64_SET((weight), 0, 54, x)

	/*
	* Per-allocator data structure.
	*/
	typedef struct metaslab_class_allocator {
	metaslab_group_t *mca_rotor;
	uint64_t mca_aliquot;

	/*
	* The allocation throttle works on a reservation system. Whenever
	* an asynchronous zio wants to perform an allocation it must
	* first reserve the number of blocks that it wants to allocate.
	* If there aren't sufficient slots available for the pending zio
	* then that I/O is throttled until more slots free up. The current
	* number of reserved allocations is maintained by the mca_alloc_slots
	* refcount. The mca_alloc_max_slots value determines the maximum
	* number of allocations that the system allows. Gang blocks are
	* allowed to reserve slots even if we've reached the maximum
	* number of allocations allowed.
	*/
	uint64_t mca_alloc_max_slots;
	zfs_refcount_t mca_alloc_slots;
	-} metaslab_class_allocator_t;
	+} ____cacheline_aligned metaslab_class_allocator_t;

	/*
	* A metaslab class encompasses a category of allocatable top-level vdevs.
	* Each top-level vdev is associated with a metaslab group which defines
	* the allocatable region for that vdev. Examples of these categories include
	* "normal" for data block allocations (i.e. main pool allocations) or "log"
	* for allocations designated for intent log devices (i.e. slog devices).
	* When a block allocation is requested from the SPA it is associated with a
	* metaslab_class_t, and only top-level vdevs (i.e. metaslab groups) belonging
	* to the class can be used to satisfy that request. Allocations are done
	* by traversing the metaslab groups that are linked off of the mca_rotor field.
	* This rotor points to the next metaslab group where allocations will be
	* attempted. Allocating a block is a 3 step process -- select the metaslab
	* group, select the metaslab, and then allocate the block. The metaslab
	* class defines the low-level block allocator that will be used as the
	* final step in allocation. These allocators are pluggable allowing each class
	* to use a block allocator that best suits that class.
	*/
	struct metaslab_class {
	kmutex_t mc_lock;
	spa_t *mc_spa;
	metaslab_ops_t *mc_ops;

	/*
	* Track the number of metaslab groups that have been initialized
	* and can accept allocations. An initialized metaslab group is
	* one has been completely added to the config (i.e. we have
	* updated the MOS config and the space has been added to the pool).
	*/
	uint64_t mc_groups;

	/*
	* Toggle to enable/disable the allocation throttle.
	*/
	boolean_t mc_alloc_throttle_enabled;

	uint64_t mc_alloc_groups; /* # of allocatable groups */

	uint64_t mc_alloc; /* total allocated space */
	uint64_t mc_deferred; /* total deferred frees */
	uint64_t mc_space; /* total space (alloc + free) */
	uint64_t mc_dspace; /* total deflated space */
	uint64_t mc_histogram[RANGE_TREE_HISTOGRAM_SIZE];

	/*
	* List of all loaded metaslabs in the class, sorted in order of most
	* recent use.
	*/
	multilist_t mc_metaslab_txg_list;

	metaslab_class_allocator_t mc_allocator[];
	};

	/*
	* Per-allocator data structure.
	*/
	typedef struct metaslab_group_allocator {
	uint64_t mga_cur_max_alloc_queue_depth;
	zfs_refcount_t mga_alloc_queue_depth;
	metaslab_t *mga_primary;
	metaslab_t *mga_secondary;
	} metaslab_group_allocator_t;

	/*
	* Metaslab groups encapsulate all the allocatable regions (i.e. metaslabs)
	* of a top-level vdev. They are linked together to form a circular linked
	* list and can belong to only one metaslab class. Metaslab groups may become
	* ineligible for allocations for a number of reasons such as limited free
	* space, fragmentation, or going offline. When this happens the allocator will
	* simply find the next metaslab group in the linked list and attempt
	* to allocate from that group instead.
	*/
	struct metaslab_group {
	kmutex_t mg_lock;
	avl_tree_t mg_metaslab_tree;
	uint64_t mg_aliquot;
	boolean_t mg_allocatable; /* can we allocate? */
	uint64_t mg_ms_ready;

	/*
	* A metaslab group is considered to be initialized only after
	* we have updated the MOS config and added the space to the pool.
	* We only allow allocation attempts to a metaslab group if it
	* has been initialized.
	*/
	boolean_t mg_initialized;

	uint64_t mg_free_capacity; /* percentage free */
	int64_t mg_bias;
	int64_t mg_activation_count;
	metaslab_class_t *mg_class;
	vdev_t *mg_vd;
	taskq_t *mg_taskq;
	metaslab_group_t *mg_prev;
	metaslab_group_t *mg_next;

	/*
	* In order for the allocation throttle to function properly, we cannot
	* have too many IOs going to each disk by default; the throttle
	* operates by allocating more work to disks that finish quickly, so
	* allocating larger chunks to each disk reduces its effectiveness.
	* However, if the number of IOs going to each allocator is too small,
	* we will not perform proper aggregation at the vdev_queue layer,
	* also resulting in decreased performance. Therefore, we will use a
	* ramp-up strategy.
	*
	* Each allocator in each metaslab group has a current queue depth
	* (mg_alloc_queue_depth[allocator]) and a current max queue depth
	* (mga_cur_max_alloc_queue_depth[allocator]), and each metaslab group
	* has an absolute max queue depth (mg_max_alloc_queue_depth). We
	* add IOs to an allocator until the mg_alloc_queue_depth for that
	* allocator hits the cur_max. Every time an IO completes for a given
	* allocator on a given metaslab group, we increment its cur_max until
	* it reaches mg_max_alloc_queue_depth. The cur_max resets every txg to
	* help protect against disks that decrease in performance over time.
	*
	* It's possible for an allocator to handle more allocations than
	* its max. This can occur when gang blocks are required or when other
	* groups are unable to handle their share of allocations.
	*/
	uint64_t mg_max_alloc_queue_depth;

	/*
	* A metalab group that can no longer allocate the minimum block
	* size will set mg_no_free_space. Once a metaslab group is out
	* of space then its share of work must be distributed to other
	* groups.
	*/
	boolean_t mg_no_free_space;

	uint64_t mg_allocations;
	uint64_t mg_failed_allocations;
	uint64_t mg_fragmentation;
	uint64_t mg_histogram[RANGE_TREE_HISTOGRAM_SIZE];

	int mg_ms_disabled;
	boolean_t mg_disabled_updating;
	kmutex_t mg_ms_disabled_lock;
	kcondvar_t mg_ms_disabled_cv;

	int mg_allocators;
	metaslab_group_allocator_t mg_allocator[];
	};

	/*
	* This value defines the number of elements in the ms_lbas array. The value
	* of 64 was chosen as it covers all power of 2 buckets up to UINT64_MAX.
	* This is the equivalent of highbit(UINT64_MAX).
	*/
	#define MAX_LBAS 64

	/*
	* Each metaslab maintains a set of in-core trees to track metaslab
	* operations. The in-core free tree (ms_allocatable) contains the list of
	* free segments which are eligible for allocation. As blocks are
	* allocated, the allocated segment are removed from the ms_allocatable and
	* added to a per txg allocation tree (ms_allocating). As blocks are
	* freed, they are added to the free tree (ms_freeing). These trees
	* allow us to process all allocations and frees in syncing context
	* where it is safe to update the on-disk space maps. An additional set
	* of in-core trees is maintained to track deferred frees
	* (ms_defer). Once a block is freed it will move from the
	* ms_freed to the ms_defer tree. A deferred free means that a block
	* has been freed but cannot be used by the pool until TXG_DEFER_SIZE
	* transactions groups later. For example, a block that is freed in txg
	* 50 will not be available for reallocation until txg 52 (50 +
	* TXG_DEFER_SIZE). This provides a safety net for uberblock rollback.
	* A pool could be safely rolled back TXG_DEFERS_SIZE transactions
	* groups and ensure that no block has been reallocated.
	*
	* The simplified transition diagram looks like this:
	*
	*
	* ALLOCATE
	* \|
	* V
	* free segment (ms_allocatable) -> ms_allocating[4] -> (write to space map)
	* ^
	* \| ms_freeing <--- FREE
	* \| \|
	* \| v
	* \| ms_freed
	* \| \|
	* +-------- ms_defer[2] <-------+-------> (write to space map)
	*
	*
	* Each metaslab's space is tracked in a single space map in the MOS,
	* which is only updated in syncing context. Each time we sync a txg,
	* we append the allocs and frees from that txg to the space map. The
	* pool space is only updated once all metaslabs have finished syncing.
	*
	* To load the in-core free tree we read the space map from disk. This
	* object contains a series of alloc and free records that are combined
	* to make up the list of all free segments in this metaslab. These
	* segments are represented in-core by the ms_allocatable and are stored
	* in an AVL tree.
	*
	* As the space map grows (as a result of the appends) it will
	* eventually become space-inefficient. When the metaslab's in-core
	* free tree is zfs_condense_pct/100 times the size of the minimal
	* on-disk representation, we rewrite it in its minimized form. If a
	* metaslab needs to condense then we must set the ms_condensing flag to
	* ensure that allocations are not performed on the metaslab that is
	* being written.
	*/
	struct metaslab {
	/*
	* This is the main lock of the metaslab and its purpose is to
	* coordinate our allocations and frees [e.g metaslab_block_alloc(),
	* metaslab_free_concrete(), ..etc] with our various syncing
	* procedures [e.g. metaslab_sync(), metaslab_sync_done(), ..etc].
	*
	* The lock is also used during some miscellaneous operations like
	* using the metaslab's histogram for the metaslab group's histogram
	* aggregation, or marking the metaslab for initialization.
	*/
	kmutex_t ms_lock;

	/*
	* Acquired together with the ms_lock whenever we expect to
	* write to metaslab data on-disk (i.e flushing entries to
	* the metaslab's space map). It helps coordinate readers of
	* the metaslab's space map [see spa_vdev_remove_thread()]
	* with writers [see metaslab_sync() or metaslab_flush()].
	*
	* Note that metaslab_load(), even though a reader, uses
	* a completely different mechanism to deal with the reading
	* of the metaslab's space map based on ms_synced_length. That
	* said, the function still uses the ms_sync_lock after it
	* has read the ms_sm [see relevant comment in metaslab_load()
	* as to why].
	*/
	kmutex_t ms_sync_lock;

	kcondvar_t ms_load_cv;
	space_map_t *ms_sm;
	uint64_t ms_id;
	uint64_t ms_start;
	uint64_t ms_size;
	uint64_t ms_fragmentation;

	range_tree_t *ms_allocating[TXG_SIZE];
	range_tree_t *ms_allocatable;
	uint64_t ms_allocated_this_txg;
	uint64_t ms_allocating_total;

	/*
	* The following range trees are accessed only from syncing context.
	* ms_free*tree only have entries while syncing, and are empty
	* between syncs.
	*/
	range_tree_t ms_freeing; / to free this syncing txg */
	range_tree_t ms_freed; / already freed this syncing txg */
	range_tree_t *ms_defer[TXG_DEFER_SIZE];
	range_tree_t ms_checkpointing; / to add to the checkpoint */

	/*
	* The ms_trim tree is the set of allocatable segments which are
	* eligible for trimming. (When the metaslab is loaded, it's a
	* subset of ms_allocatable.) It's kept in-core as long as the
	* autotrim property is set and is not vacated when the metaslab
	* is unloaded. Its purpose is to aggregate freed ranges to
	* facilitate efficient trimming.
	*/
	range_tree_t *ms_trim;

	boolean_t ms_condensing; /* condensing? */
	boolean_t ms_condense_wanted;

	/*
	* The number of consumers which have disabled the metaslab.
	*/
	uint64_t ms_disabled;

	/*
	* We must always hold the ms_lock when modifying ms_loaded
	* and ms_loading.
	*/
	boolean_t ms_loaded;
	boolean_t ms_loading;
	kcondvar_t ms_flush_cv;
	boolean_t ms_flushing;

	/*
	* The following histograms count entries that are in the
	* metaslab's space map (and its histogram) but are not in
	* ms_allocatable yet, because they are in ms_freed, ms_freeing,
	* or ms_defer[].
	*
	* When the metaslab is not loaded, its ms_weight needs to
	* reflect what is allocatable (i.e. what will be part of
	* ms_allocatable if it is loaded). The weight is computed from
	* the spacemap histogram, but that includes ranges that are
	* not yet allocatable (because they are in ms_freed,
	* ms_freeing, or ms_defer[]). Therefore, when calculating the
	* weight, we need to remove those ranges.
	*
	* The ranges in the ms_freed and ms_defer[] range trees are all
	* present in the spacemap. However, the spacemap may have
	* multiple entries to represent a contiguous range, because it
	* is written across multiple sync passes, but the changes of
	* all sync passes are consolidated into the range trees.
	* Adjacent ranges that are freed in different sync passes of
	* one txg will be represented separately (as 2 or more entries)
	* in the space map (and its histogram), but these adjacent
	* ranges will be consolidated (represented as one entry) in the
	* ms_freed/ms_defer[] range trees (and their histograms).
	*
	* When calculating the weight, we can not simply subtract the
	* range trees' histograms from the spacemap's histogram,
	* because the range trees' histograms may have entries in
	* higher buckets than the spacemap, due to consolidation.
	* Instead we must subtract the exact entries that were added to
	* the spacemap's histogram. ms_synchist and ms_deferhist[]
	* represent these exact entries, so we can subtract them from
	* the spacemap's histogram when calculating ms_weight.
	*
	* ms_synchist represents the same ranges as ms_freeing +
	* ms_freed, but without consolidation across sync passes.
	*
	* ms_deferhist[i] represents the same ranges as ms_defer[i],
	* but without consolidation across sync passes.
	*/
	uint64_t ms_synchist[SPACE_MAP_HISTOGRAM_SIZE];
	uint64_t ms_deferhist[TXG_DEFER_SIZE][SPACE_MAP_HISTOGRAM_SIZE];

	/*
	* Tracks the exact amount of allocated space of this metaslab
	* (and specifically the metaslab's space map) up to the most
	* recently completed sync pass [see usage in metaslab_sync()].
	*/
	uint64_t ms_allocated_space;
	int64_t ms_deferspace; /* sum of ms_defermap[] space */
	uint64_t ms_weight; /* weight vs. others in group */
	uint64_t ms_activation_weight; /* activation weight */

	/*
	* Track of whenever a metaslab is selected for loading or allocation.
	* We use this value to determine how long the metaslab should
	* stay cached.
	*/
	uint64_t ms_selected_txg;
	/*
	* ms_load/unload_time can be used for performance monitoring
	* (e.g. by dtrace or mdb).
	*/
	hrtime_t ms_load_time; /* time last loaded */
	hrtime_t ms_unload_time; /* time last unloaded */
	hrtime_t ms_selected_time; /* time last allocated from */

	uint64_t ms_alloc_txg; /* last successful alloc (debug only) */
	uint64_t ms_max_size; /* maximum allocatable size */

	/*
	* -1 if it's not active in an allocator, otherwise set to the allocator
	* this metaslab is active for.
	*/
	int ms_allocator;
	boolean_t ms_primary; /* Only valid if ms_allocator is not -1 */

	/*
	* The metaslab block allocators can optionally use a size-ordered
	* range tree and/or an array of LBAs. Not all allocators use
	* this functionality. The ms_allocatable_by_size should always
	* contain the same number of segments as the ms_allocatable. The
	* only difference is that the ms_allocatable_by_size is ordered by
	* segment sizes.
	*/
	zfs_btree_t ms_allocatable_by_size;
	zfs_btree_t ms_unflushed_frees_by_size;
	uint64_t ms_lbas[MAX_LBAS];

	metaslab_group_t ms_group; / metaslab group */
	avl_node_t ms_group_node; /* node in metaslab group tree */
	txg_node_t ms_txg_node; /* per-txg dirty metaslab links */
	avl_node_t ms_spa_txg_node; /* node in spa_metaslabs_by_txg */
	/*
	* Node in metaslab class's selected txg list
	*/
	multilist_node_t ms_class_txg_node;

	/*
	* Allocs and frees that are committed to the vdev log spacemap but
	* not yet to this metaslab's spacemap.
	*/
	range_tree_t *ms_unflushed_allocs;
	range_tree_t *ms_unflushed_frees;

	/*
	* We have flushed entries up to but not including this TXG. In
	* other words, all changes from this TXG and onward should not
	* be in this metaslab's space map and must be read from the
	* log space maps.
	*/
	uint64_t ms_unflushed_txg;

	/* updated every time we are done syncing the metaslab's space map */
	uint64_t ms_synced_length;

	boolean_t ms_new;
	};

	typedef struct metaslab_unflushed_phys {
	/* on-disk counterpart of ms_unflushed_txg */
	uint64_t msp_unflushed_txg;
	} metaslab_unflushed_phys_t;

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_METASLAB_IMPL_H */
	diff --git a/sys/contrib/openzfs/include/sys/spa.h b/sys/contrib/openzfs/include/sys/spa.h
	index 9dd47a1ebece..532926e12487 100644
	--- a/sys/contrib/openzfs/include/sys/spa.h
	+++ b/sys/contrib/openzfs/include/sys/spa.h
	@@ -1,1231 +1,1230 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2021 by Delphix. All rights reserved.
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	* Copyright 2013 Saso Kiselkov. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	* Copyright 2017 Joyent, Inc.
	* Copyright (c) 2017, 2019, Datto Inc. All rights reserved.
	* Copyright (c) 2017, Intel Corporation.
	* Copyright (c) 2019, Allan Jude
	* Copyright (c) 2019, Klara Inc.
	*/

	#ifndef _SYS_SPA_H
	#define _SYS_SPA_H

	#include <sys/avl.h>
	#include <sys/zfs_context.h>
	#include <sys/kstat.h>
	#include <sys/nvpair.h>
	#include <sys/sysmacros.h>
	#include <sys/types.h>
	#include <sys/fs/zfs.h>
	#include <sys/spa_checksum.h>
	#include <sys/dmu.h>
	#include <sys/space_map.h>
	#include <sys/bitops.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* Forward references that lots of things need.
	*/
	typedef struct spa spa_t;
	typedef struct vdev vdev_t;
	typedef struct metaslab metaslab_t;
	typedef struct metaslab_group metaslab_group_t;
	typedef struct metaslab_class metaslab_class_t;
	typedef struct zio zio_t;
	typedef struct zilog zilog_t;
	typedef struct spa_aux_vdev spa_aux_vdev_t;
	typedef struct ddt ddt_t;
	typedef struct ddt_entry ddt_entry_t;
	typedef struct zbookmark_phys zbookmark_phys_t;

	struct bpobj;
	struct bplist;
	struct dsl_pool;
	struct dsl_dataset;
	struct dsl_crypto_params;

	/*
	* We currently support block sizes from 512 bytes to 16MB.
	* The benefits of larger blocks, and thus larger IO, need to be weighed
	* against the cost of COWing a giant block to modify one byte, and the
	* large latency of reading or writing a large block.
	*
	* Note that although blocks up to 16MB are supported, the recordsize
	* property can not be set larger than zfs_max_recordsize (default 1MB).
	* See the comment near zfs_max_recordsize in dsl_dataset.c for details.
	*
	* Note that although the LSIZE field of the blkptr_t can store sizes up
	* to 32MB, the dnode's dn_datablkszsec can only store sizes up to
	* 32MB - 512 bytes. Therefore, we limit SPA_MAXBLOCKSIZE to 16MB.
	*/
	#define SPA_MINBLOCKSHIFT 9
	#define SPA_OLD_MAXBLOCKSHIFT 17
	#define SPA_MAXBLOCKSHIFT 24
	#define SPA_MINBLOCKSIZE (1ULL << SPA_MINBLOCKSHIFT)
	#define SPA_OLD_MAXBLOCKSIZE (1ULL << SPA_OLD_MAXBLOCKSHIFT)
	#define SPA_MAXBLOCKSIZE (1ULL << SPA_MAXBLOCKSHIFT)

	/*
	* Alignment Shift (ashift) is an immutable, internal top-level vdev property
	* which can only be set at vdev creation time. Physical writes are always done
	* according to it, which makes 2^ashift the smallest possible IO on a vdev.
	*
	* We currently allow values ranging from 512 bytes (2^9 = 512) to 64 KiB
	* (2^16 = 65,536).
	*/
	#define ASHIFT_MIN 9
	#define ASHIFT_MAX 16

	/*
	* Size of block to hold the configuration data (a packed nvlist)
	*/
	#define SPA_CONFIG_BLOCKSIZE (1ULL << 14)

	/*
	* The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
	* The ASIZE encoding should be at least 64 times larger (6 more bits)
	* to support up to 4-way RAID-Z mirror mode with worst-case gang block
	* overhead, three DVAs per bp, plus one more bit in case we do anything
	* else that expands the ASIZE.
	*/
	#define SPA_LSIZEBITS 16 /* LSIZE up to 32M (2^16 * 512) */
	#define SPA_PSIZEBITS 16 /* PSIZE up to 32M (2^16 * 512) */
	#define SPA_ASIZEBITS 24 /* ASIZE up to 64 times larger */

	#define SPA_COMPRESSBITS 7
	#define SPA_VDEVBITS 24
	#define SPA_COMPRESSMASK ((1U << SPA_COMPRESSBITS) - 1)

	/*
	* All SPA data is represented by 128-bit data virtual addresses (DVAs).
	* The members of the dva_t should be considered opaque outside the SPA.
	*/
	typedef struct dva {
	uint64_t dva_word[2];
	} dva_t;


	/*
	* Some checksums/hashes need a 256-bit initialization salt. This salt is kept
	* secret and is suitable for use in MAC algorithms as the key.
	*/
	typedef struct zio_cksum_salt {
	uint8_t zcs_bytes[32];
	} zio_cksum_salt_t;

	/*
	* Each block is described by its DVAs, time of birth, checksum, etc.
	* The word-by-word, bit-by-bit layout of the blkptr is as follows:
	*
	* 64 56 48 40 32 24 16 8 0
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 0 \| pad \| vdev1 \| GRID \| ASIZE \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 1 \|G\| offset1 \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 2 \| pad \| vdev2 \| GRID \| ASIZE \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 3 \|G\| offset2 \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 4 \| pad \| vdev3 \| GRID \| ASIZE \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 5 \|G\| offset3 \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 6 \|BDX\|lvl\| type \| cksum \|E\| comp\| PSIZE \| LSIZE \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 7 \| padding \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 8 \| padding \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 9 \| physical birth txg \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* a \| logical birth txg \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* b \| fill count \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* c \| checksum[0] \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* d \| checksum[1] \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* e \| checksum[2] \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* f \| checksum[3] \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	*
	* Legend:
	*
	* vdev virtual device ID
	* offset offset into virtual device
	* LSIZE logical size
	* PSIZE physical size (after compression)
	* ASIZE allocated size (including RAID-Z parity and gang block headers)
	* GRID RAID-Z layout information (reserved for future use)
	* cksum checksum function
	* comp compression function
	* G gang block indicator
	* B byteorder (endianness)
	* D dedup
	* X encryption
	* E blkptr_t contains embedded data (see below)
	* lvl level of indirection
	* type DMU object type
	* phys birth txg when dva[0] was written; zero if same as logical birth txg
	* note that typically all the dva's would be written in this
	* txg, but they could be different if they were moved by
	* device removal.
	* log. birth transaction group in which the block was logically born
	* fill count number of non-zero blocks under this bp
	* checksum[4] 256-bit checksum of the data this bp describes
	*/

	/*
	* The blkptr_t's of encrypted blocks also need to store the encryption
	* parameters so that the block can be decrypted. This layout is as follows:
	*
	* 64 56 48 40 32 24 16 8 0
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 0 \| vdev1 \| GRID \| ASIZE \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 1 \|G\| offset1 \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 2 \| vdev2 \| GRID \| ASIZE \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 3 \|G\| offset2 \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 4 \| salt \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 5 \| IV1 \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 6 \|BDX\|lvl\| type \| cksum \|E\| comp\| PSIZE \| LSIZE \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 7 \| padding \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 8 \| padding \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 9 \| physical birth txg \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* a \| logical birth txg \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* b \| IV2 \| fill count \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* c \| checksum[0] \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* d \| checksum[1] \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* e \| MAC[0] \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* f \| MAC[1] \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	*
	* Legend:
	*
	* salt Salt for generating encryption keys
	* IV1 First 64 bits of encryption IV
	* X Block requires encryption handling (set to 1)
	* E blkptr_t contains embedded data (set to 0, see below)
	* fill count number of non-zero blocks under this bp (truncated to 32 bits)
	* IV2 Last 32 bits of encryption IV
	* checksum[2] 128-bit checksum of the data this bp describes
	* MAC[2] 128-bit message authentication code for this data
	*
	* The X bit being set indicates that this block is one of 3 types. If this is
	* a level 0 block with an encrypted object type, the block is encrypted
	* (see BP_IS_ENCRYPTED()). If this is a level 0 block with an unencrypted
	* object type, this block is authenticated with an HMAC (see
	* BP_IS_AUTHENTICATED()). Otherwise (if level > 0), this bp will use the MAC
	* words to store a checksum-of-MACs from the level below (see
	* BP_HAS_INDIRECT_MAC_CKSUM()). For convenience in the code, BP_IS_PROTECTED()
	* refers to both encrypted and authenticated blocks and BP_USES_CRYPT()
	* refers to any of these 3 kinds of blocks.
	*
	* The additional encryption parameters are the salt, IV, and MAC which are
	* explained in greater detail in the block comment at the top of zio_crypt.c.
	* The MAC occupies half of the checksum space since it serves a very similar
	* purpose: to prevent data corruption on disk. The only functional difference
	* is that the checksum is used to detect on-disk corruption whether or not the
	* encryption key is loaded and the MAC provides additional protection against
	* malicious disk tampering. We use the 3rd DVA to store the salt and first
	* 64 bits of the IV. As a result encrypted blocks can only have 2 copies
	* maximum instead of the normal 3. The last 32 bits of the IV are stored in
	* the upper bits of what is usually the fill count. Note that only blocks at
	* level 0 or -2 are ever encrypted, which allows us to guarantee that these
	* 32 bits are not trampled over by other code (see zio_crypt.c for details).
	* The salt and IV are not used for authenticated bps or bps with an indirect
	* MAC checksum, so these blocks can utilize all 3 DVAs and the full 64 bits
	* for the fill count.
	*/

	/*
	* "Embedded" blkptr_t's don't actually point to a block, instead they
	* have a data payload embedded in the blkptr_t itself. See the comment
	* in blkptr.c for more details.
	*
	* The blkptr_t is laid out as follows:
	*
	* 64 56 48 40 32 24 16 8 0
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 0 \| payload \|
	* 1 \| payload \|
	* 2 \| payload \|
	* 3 \| payload \|
	* 4 \| payload \|
	* 5 \| payload \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 6 \|BDX\|lvl\| type \| etype \|E\| comp\| PSIZE\| LSIZE \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* 7 \| payload \|
	* 8 \| payload \|
	* 9 \| payload \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* a \| logical birth txg \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* b \| payload \|
	* c \| payload \|
	* d \| payload \|
	* e \| payload \|
	* f \| payload \|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	*
	* Legend:
	*
	* payload contains the embedded data
	* B (byteorder) byteorder (endianness)
	* D (dedup) padding (set to zero)
	* X encryption (set to zero)
	* E (embedded) set to one
	* lvl indirection level
	* type DMU object type
	* etype how to interpret embedded data (BP_EMBEDDED_TYPE_*)
	* comp compression function of payload
	* PSIZE size of payload after compression, in bytes
	* LSIZE logical size of payload, in bytes
	* note that 25 bits is enough to store the largest
	* "normal" BP's LSIZE (2^16 * 2^9) in bytes
	* log. birth transaction group in which the block was logically born
	*
	* Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
	* bp's they are stored in units of SPA_MINBLOCKSHIFT.
	* Generally, the generic BP_GET_*() macros can be used on embedded BP's.
	* The B, D, X, lvl, type, and comp fields are stored the same as with normal
	* BP's so the BP_SET_* macros can be used with them. etype, PSIZE, LSIZE must
	* be set with the BPE_SET_* macros. BP_SET_EMBEDDED() should be called before
	* other macros, as they assert that they are only used on BP's of the correct
	* "embedded-ness". Encrypted blkptr_t's cannot be embedded because they use
	* the payload space for encryption parameters (see the comment above on
	* how encryption parameters are stored).
	*/

	#define BPE_GET_ETYPE(bp) \
	(ASSERT(BP_IS_EMBEDDED(bp)), \
	BF64_GET((bp)->blk_prop, 40, 8))
	#define BPE_SET_ETYPE(bp, t) do { \
	ASSERT(BP_IS_EMBEDDED(bp)); \
	BF64_SET((bp)->blk_prop, 40, 8, t); \
	_NOTE(CONSTCOND) } while (0)

	#define BPE_GET_LSIZE(bp) \
	(ASSERT(BP_IS_EMBEDDED(bp)), \
	BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
	#define BPE_SET_LSIZE(bp, x) do { \
	ASSERT(BP_IS_EMBEDDED(bp)); \
	BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
	_NOTE(CONSTCOND) } while (0)

	#define BPE_GET_PSIZE(bp) \
	(ASSERT(BP_IS_EMBEDDED(bp)), \
	BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
	#define BPE_SET_PSIZE(bp, x) do { \
	ASSERT(BP_IS_EMBEDDED(bp)); \
	BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
	_NOTE(CONSTCOND) } while (0)

	typedef enum bp_embedded_type {
	BP_EMBEDDED_TYPE_DATA,
	BP_EMBEDDED_TYPE_RESERVED, /* Reserved for Delphix byteswap feature. */
	BP_EMBEDDED_TYPE_REDACTED,
	NUM_BP_EMBEDDED_TYPES
	} bp_embedded_type_t;

	#define BPE_NUM_WORDS 14
	#define BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
	#define BPE_IS_PAYLOADWORD(bp, wp) \
	((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)

	#define SPA_BLKPTRSHIFT 7 /* blkptr_t is 128 bytes */
	#define SPA_DVAS_PER_BP 3 /* Number of DVAs in a bp */
	#define SPA_SYNC_MIN_VDEVS 3 /* min vdevs to update during sync */

	/*
	* A block is a hole when it has either 1) never been written to, or
	* 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads
	* without physically allocating disk space. Holes are represented in the
	* blkptr_t structure by zeroed blk_dva. Correct checking for holes is
	* done through the BP_IS_HOLE macro. For holes, the logical size, level,
	* DMU object type, and birth times are all also stored for holes that
	* were written to at some point (i.e. were punched after having been filled).
	*/
	typedef struct blkptr {
	dva_t blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
	uint64_t blk_prop; /* size, compression, type, etc */
	uint64_t blk_pad[2]; /* Extra space for the future */
	uint64_t blk_phys_birth; /* txg when block was allocated */
	uint64_t blk_birth; /* transaction group at birth */
	uint64_t blk_fill; /* fill count */
	zio_cksum_t blk_cksum; /* 256-bit checksum */
	} blkptr_t;

	/*
	* Macros to get and set fields in a bp or DVA.
	*/

	/*
	* Note, for gang blocks, DVA_GET_ASIZE() is the total space allocated for
	* this gang DVA including its children BP's. The space allocated at this
	* DVA's vdev/offset is vdev_gang_header_asize(vdev).
	*/
	#define DVA_GET_ASIZE(dva) \
	BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
	#define DVA_SET_ASIZE(dva, x) \
	BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
	SPA_MINBLOCKSHIFT, 0, x)

	#define DVA_GET_GRID(dva) BF64_GET((dva)->dva_word[0], 24, 8)
	#define DVA_SET_GRID(dva, x) BF64_SET((dva)->dva_word[0], 24, 8, x)

	#define DVA_GET_VDEV(dva) BF64_GET((dva)->dva_word[0], 32, SPA_VDEVBITS)
	#define DVA_SET_VDEV(dva, x) \
	BF64_SET((dva)->dva_word[0], 32, SPA_VDEVBITS, x)

	#define DVA_GET_OFFSET(dva) \
	BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
	#define DVA_SET_OFFSET(dva, x) \
	BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)

	#define DVA_GET_GANG(dva) BF64_GET((dva)->dva_word[1], 63, 1)
	#define DVA_SET_GANG(dva, x) BF64_SET((dva)->dva_word[1], 63, 1, x)

	#define BP_GET_LSIZE(bp) \
	(BP_IS_EMBEDDED(bp) ? \
	(BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
	BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
	#define BP_SET_LSIZE(bp, x) do { \
	ASSERT(!BP_IS_EMBEDDED(bp)); \
	BF64_SET_SB((bp)->blk_prop, \
	0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
	_NOTE(CONSTCOND) } while (0)

	#define BP_GET_PSIZE(bp) \
	(BP_IS_EMBEDDED(bp) ? 0 : \
	BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1))
	#define BP_SET_PSIZE(bp, x) do { \
	ASSERT(!BP_IS_EMBEDDED(bp)); \
	BF64_SET_SB((bp)->blk_prop, \
	16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
	_NOTE(CONSTCOND) } while (0)

	#define BP_GET_COMPRESS(bp) \
	BF64_GET((bp)->blk_prop, 32, SPA_COMPRESSBITS)
	#define BP_SET_COMPRESS(bp, x) \
	BF64_SET((bp)->blk_prop, 32, SPA_COMPRESSBITS, x)

	#define BP_IS_EMBEDDED(bp) BF64_GET((bp)->blk_prop, 39, 1)
	#define BP_SET_EMBEDDED(bp, x) BF64_SET((bp)->blk_prop, 39, 1, x)

	#define BP_GET_CHECKSUM(bp) \
	(BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \
	BF64_GET((bp)->blk_prop, 40, 8))
	#define BP_SET_CHECKSUM(bp, x) do { \
	ASSERT(!BP_IS_EMBEDDED(bp)); \
	BF64_SET((bp)->blk_prop, 40, 8, x); \
	_NOTE(CONSTCOND) } while (0)

	#define BP_GET_TYPE(bp) BF64_GET((bp)->blk_prop, 48, 8)
	#define BP_SET_TYPE(bp, x) BF64_SET((bp)->blk_prop, 48, 8, x)

	#define BP_GET_LEVEL(bp) BF64_GET((bp)->blk_prop, 56, 5)
	#define BP_SET_LEVEL(bp, x) BF64_SET((bp)->blk_prop, 56, 5, x)

	/* encrypted, authenticated, and MAC cksum bps use the same bit */
	#define BP_USES_CRYPT(bp) BF64_GET((bp)->blk_prop, 61, 1)
	#define BP_SET_CRYPT(bp, x) BF64_SET((bp)->blk_prop, 61, 1, x)

	#define BP_IS_ENCRYPTED(bp) \
	(BP_USES_CRYPT(bp) && \
	BP_GET_LEVEL(bp) <= 0 && \
	DMU_OT_IS_ENCRYPTED(BP_GET_TYPE(bp)))

	#define BP_IS_AUTHENTICATED(bp) \
	(BP_USES_CRYPT(bp) && \
	BP_GET_LEVEL(bp) <= 0 && \
	!DMU_OT_IS_ENCRYPTED(BP_GET_TYPE(bp)))

	#define BP_HAS_INDIRECT_MAC_CKSUM(bp) \
	(BP_USES_CRYPT(bp) && BP_GET_LEVEL(bp) > 0)

	#define BP_IS_PROTECTED(bp) \
	(BP_IS_ENCRYPTED(bp) \|\| BP_IS_AUTHENTICATED(bp))

	#define BP_GET_DEDUP(bp) BF64_GET((bp)->blk_prop, 62, 1)
	#define BP_SET_DEDUP(bp, x) BF64_SET((bp)->blk_prop, 62, 1, x)

	#define BP_GET_BYTEORDER(bp) BF64_GET((bp)->blk_prop, 63, 1)
	#define BP_SET_BYTEORDER(bp, x) BF64_SET((bp)->blk_prop, 63, 1, x)

	#define BP_GET_FREE(bp) BF64_GET((bp)->blk_fill, 0, 1)
	#define BP_SET_FREE(bp, x) BF64_SET((bp)->blk_fill, 0, 1, x)

	#define BP_PHYSICAL_BIRTH(bp) \
	(BP_IS_EMBEDDED(bp) ? 0 : \
	(bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)

	#define BP_SET_BIRTH(bp, logical, physical) \
	{ \
	ASSERT(!BP_IS_EMBEDDED(bp)); \
	(bp)->blk_birth = (logical); \
	(bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
	}

	#define BP_GET_FILL(bp) \
	((BP_IS_ENCRYPTED(bp)) ? BF64_GET((bp)->blk_fill, 0, 32) : \
	((BP_IS_EMBEDDED(bp)) ? 1 : (bp)->blk_fill))

	#define BP_SET_FILL(bp, fill) \
	{ \
	if (BP_IS_ENCRYPTED(bp)) \
	BF64_SET((bp)->blk_fill, 0, 32, fill); \
	else \
	(bp)->blk_fill = fill; \
	}

	#define BP_GET_IV2(bp) \
	(ASSERT(BP_IS_ENCRYPTED(bp)), \
	BF64_GET((bp)->blk_fill, 32, 32))
	#define BP_SET_IV2(bp, iv2) \
	{ \
	ASSERT(BP_IS_ENCRYPTED(bp)); \
	BF64_SET((bp)->blk_fill, 32, 32, iv2); \
	}

	#define BP_IS_METADATA(bp) \
	(BP_GET_LEVEL(bp) > 0 \|\| DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))

	#define BP_GET_ASIZE(bp) \
	(BP_IS_EMBEDDED(bp) ? 0 : \
	DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
	DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
	(DVA_GET_ASIZE(&(bp)->blk_dva[2]) * !BP_IS_ENCRYPTED(bp)))

	#define BP_GET_UCSIZE(bp) \
	(BP_IS_METADATA(bp) ? BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp))

	#define BP_GET_NDVAS(bp) \
	(BP_IS_EMBEDDED(bp) ? 0 : \
	!!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
	!!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
	(!!DVA_GET_ASIZE(&(bp)->blk_dva[2]) * !BP_IS_ENCRYPTED(bp)))

	#define BP_COUNT_GANG(bp) \
	(BP_IS_EMBEDDED(bp) ? 0 : \
	(DVA_GET_GANG(&(bp)->blk_dva[0]) + \
	DVA_GET_GANG(&(bp)->blk_dva[1]) + \
	(DVA_GET_GANG(&(bp)->blk_dva[2]) * !BP_IS_ENCRYPTED(bp))))

	#define DVA_EQUAL(dva1, dva2) \
	((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
	(dva1)->dva_word[0] == (dva2)->dva_word[0])

	#define BP_EQUAL(bp1, bp2) \
	(BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) && \
	(bp1)->blk_birth == (bp2)->blk_birth && \
	DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) && \
	DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) && \
	DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))


	#define DVA_IS_VALID(dva) (DVA_GET_ASIZE(dva) != 0)

	#define BP_IDENTITY(bp) (ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0])
	#define BP_IS_GANG(bp) \
	(BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp)))
	#define DVA_IS_EMPTY(dva) ((dva)->dva_word[0] == 0ULL && \
	(dva)->dva_word[1] == 0ULL)
	#define BP_IS_HOLE(bp) \
	(!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp)))

	#define BP_SET_REDACTED(bp) \
	{ \
	BP_SET_EMBEDDED(bp, B_TRUE); \
	BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_REDACTED); \
	}
	#define BP_IS_REDACTED(bp) \
	(BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_REDACTED)

	/* BP_IS_RAIDZ(bp) assumes no block compression */
	#define BP_IS_RAIDZ(bp) (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
	BP_GET_PSIZE(bp))

	#define BP_ZERO(bp) \
	{ \
	(bp)->blk_dva[0].dva_word[0] = 0; \
	(bp)->blk_dva[0].dva_word[1] = 0; \
	(bp)->blk_dva[1].dva_word[0] = 0; \
	(bp)->blk_dva[1].dva_word[1] = 0; \
	(bp)->blk_dva[2].dva_word[0] = 0; \
	(bp)->blk_dva[2].dva_word[1] = 0; \
	(bp)->blk_prop = 0; \
	(bp)->blk_pad[0] = 0; \
	(bp)->blk_pad[1] = 0; \
	(bp)->blk_phys_birth = 0; \
	(bp)->blk_birth = 0; \
	(bp)->blk_fill = 0; \
	ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \
	}

	#ifdef _ZFS_BIG_ENDIAN
	#define ZFS_HOST_BYTEORDER (0ULL)
	#else
	#define ZFS_HOST_BYTEORDER (1ULL)
	#endif

	#define BP_SHOULD_BYTESWAP(bp) (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)

	#define BP_SPRINTF_LEN 400

	/*
	* This macro allows code sharing between zfs, libzpool, and mdb.
	* 'func' is either snprintf() or mdb_snprintf().
	* 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line.
	*/

	#define SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \
	{ \
	static const char *copyname[] = \
	{ "zero", "single", "double", "triple" }; \
	int len = 0; \
	int copies = 0; \
	const char *crypt_type; \
	if (bp != NULL) { \
	if (BP_IS_ENCRYPTED(bp)) { \
	crypt_type = "encrypted"; \
	/* LINTED E_SUSPICIOUS_COMPARISON */ \
	} else if (BP_IS_AUTHENTICATED(bp)) { \
	crypt_type = "authenticated"; \
	} else if (BP_HAS_INDIRECT_MAC_CKSUM(bp)) { \
	crypt_type = "indirect-MAC"; \
	} else { \
	crypt_type = "unencrypted"; \
	} \
	} \
	if (bp == NULL) { \
	len += func(buf + len, size - len, "<NULL>"); \
	} else if (BP_IS_HOLE(bp)) { \
	len += func(buf + len, size - len, \
	"HOLE [L%llu %s] " \
	"size=%llxL birth=%lluL", \
	(u_longlong_t)BP_GET_LEVEL(bp), \
	type, \
	(u_longlong_t)BP_GET_LSIZE(bp), \
	(u_longlong_t)bp->blk_birth); \
	} else if (BP_IS_EMBEDDED(bp)) { \
	len = func(buf + len, size - len, \
	"EMBEDDED [L%llu %s] et=%u %s " \
	"size=%llxL/%llxP birth=%lluL", \
	(u_longlong_t)BP_GET_LEVEL(bp), \
	type, \
	(int)BPE_GET_ETYPE(bp), \
	compress, \
	(u_longlong_t)BPE_GET_LSIZE(bp), \
	(u_longlong_t)BPE_GET_PSIZE(bp), \
	(u_longlong_t)bp->blk_birth); \
	} else if (BP_IS_REDACTED(bp)) { \
	len += func(buf + len, size - len, \
	"REDACTED [L%llu %s] size=%llxL birth=%lluL", \
	(u_longlong_t)BP_GET_LEVEL(bp), \
	type, \
	(u_longlong_t)BP_GET_LSIZE(bp), \
	(u_longlong_t)bp->blk_birth); \
	} else { \
	for (int d = 0; d < BP_GET_NDVAS(bp); d++) { \
	const dva_t *dva = &bp->blk_dva[d]; \
	if (DVA_IS_VALID(dva)) \
	copies++; \
	len += func(buf + len, size - len, \
	"DVA[%d]=<%llu:%llx:%llx>%c", d, \
	(u_longlong_t)DVA_GET_VDEV(dva), \
	(u_longlong_t)DVA_GET_OFFSET(dva), \
	(u_longlong_t)DVA_GET_ASIZE(dva), \
	ws); \
	} \
	if (BP_IS_ENCRYPTED(bp)) { \
	len += func(buf + len, size - len, \
	"salt=%llx iv=%llx:%llx%c", \
	(u_longlong_t)bp->blk_dva[2].dva_word[0], \
	(u_longlong_t)bp->blk_dva[2].dva_word[1], \
	(u_longlong_t)BP_GET_IV2(bp), \
	ws); \
	} \
	if (BP_IS_GANG(bp) && \
	DVA_GET_ASIZE(&bp->blk_dva[2]) <= \
	DVA_GET_ASIZE(&bp->blk_dva[1]) / 2) \
	copies--; \
	len += func(buf + len, size - len, \
	"[L%llu %s] %s %s %s %s %s %s %s%c" \
	"size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c" \
	"cksum=%llx:%llx:%llx:%llx", \
	(u_longlong_t)BP_GET_LEVEL(bp), \
	type, \
	checksum, \
	compress, \
	crypt_type, \
	BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE", \
	BP_IS_GANG(bp) ? "gang" : "contiguous", \
	BP_GET_DEDUP(bp) ? "dedup" : "unique", \
	copyname[copies], \
	ws, \
	(u_longlong_t)BP_GET_LSIZE(bp), \
	(u_longlong_t)BP_GET_PSIZE(bp), \
	(u_longlong_t)bp->blk_birth, \
	(u_longlong_t)BP_PHYSICAL_BIRTH(bp), \
	(u_longlong_t)BP_GET_FILL(bp), \
	ws, \
	(u_longlong_t)bp->blk_cksum.zc_word[0], \
	(u_longlong_t)bp->blk_cksum.zc_word[1], \
	(u_longlong_t)bp->blk_cksum.zc_word[2], \
	(u_longlong_t)bp->blk_cksum.zc_word[3]); \
	} \
	ASSERT(len < size); \
	}

	#define BP_GET_BUFC_TYPE(bp) \
	(BP_IS_METADATA(bp) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)

	typedef enum spa_import_type {
	SPA_IMPORT_EXISTING,
	SPA_IMPORT_ASSEMBLE
	} spa_import_type_t;

	typedef enum spa_mode {
	SPA_MODE_UNINIT = 0,
	SPA_MODE_READ = 1,
	SPA_MODE_WRITE = 2,
	} spa_mode_t;

	/*
	* Send TRIM commands in-line during normal pool operation while deleting.
	* OFF: no
	* ON: yes
	* NB: IN_FREEBSD_BASE is defined within the FreeBSD sources.
	*/
	typedef enum {
	SPA_AUTOTRIM_OFF = 0, /* default */
	SPA_AUTOTRIM_ON,
	#ifdef IN_FREEBSD_BASE
	SPA_AUTOTRIM_DEFAULT = SPA_AUTOTRIM_ON,
	#else
	SPA_AUTOTRIM_DEFAULT = SPA_AUTOTRIM_OFF,
	#endif
	} spa_autotrim_t;

	/*
	* Reason TRIM command was issued, used internally for accounting purposes.
	*/
	typedef enum trim_type {
	TRIM_TYPE_MANUAL = 0,
	TRIM_TYPE_AUTO = 1,
	TRIM_TYPE_SIMPLE = 2
	} trim_type_t;

	/* state manipulation functions */
	extern int spa_open(const char pool, spa_t , void tag);
	extern int spa_open_rewind(const char pool, spa_t , void tag,
	nvlist_t policy, nvlist_t *config);
	extern int spa_get_stats(const char pool, nvlist_t config, char altroot,
	size_t buflen);
	extern int spa_create(const char pool, nvlist_t nvroot, nvlist_t *props,
	nvlist_t zplprops, struct dsl_crypto_params dcp);
	extern int spa_import(char pool, nvlist_t config, nvlist_t *props,
	uint64_t flags);
	extern nvlist_t spa_tryimport(nvlist_t tryconfig);
	extern int spa_destroy(const char *pool);
	extern int spa_checkpoint(const char *pool);
	extern int spa_checkpoint_discard(const char *pool);
	extern int spa_export(const char pool, nvlist_t *oldconfig, boolean_t force,
	boolean_t hardforce);
	extern int spa_reset(const char *pool);
	extern void spa_async_request(spa_t *spa, int flag);
	extern void spa_async_unrequest(spa_t *spa, int flag);
	extern void spa_async_suspend(spa_t *spa);
	extern void spa_async_resume(spa_t *spa);
	extern int spa_async_tasks(spa_t *spa);
	extern spa_t spa_inject_addref(char pool);
	extern void spa_inject_delref(spa_t *spa);
	extern void spa_scan_stat_init(spa_t *spa);
	extern int spa_scan_get_stats(spa_t spa, pool_scan_stat_t ps);
	extern int bpobj_enqueue_alloc_cb(void arg, const blkptr_t bp, dmu_tx_t *tx);
	extern int bpobj_enqueue_free_cb(void arg, const blkptr_t bp, dmu_tx_t *tx);

	#define SPA_ASYNC_CONFIG_UPDATE 0x01
	#define SPA_ASYNC_REMOVE 0x02
	#define SPA_ASYNC_PROBE 0x04
	#define SPA_ASYNC_RESILVER_DONE 0x08
	#define SPA_ASYNC_RESILVER 0x10
	#define SPA_ASYNC_AUTOEXPAND 0x20
	#define SPA_ASYNC_REMOVE_DONE 0x40
	#define SPA_ASYNC_REMOVE_STOP 0x80
	#define SPA_ASYNC_INITIALIZE_RESTART 0x100
	#define SPA_ASYNC_TRIM_RESTART 0x200
	#define SPA_ASYNC_AUTOTRIM_RESTART 0x400
	#define SPA_ASYNC_L2CACHE_REBUILD 0x800
	#define SPA_ASYNC_L2CACHE_TRIM 0x1000
	#define SPA_ASYNC_REBUILD_DONE 0x2000

	/* device manipulation */
	extern int spa_vdev_add(spa_t spa, nvlist_t nvroot);
	extern int spa_vdev_attach(spa_t spa, uint64_t guid, nvlist_t nvroot,
	int replacing, int rebuild);
	extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
	int replace_done);
	extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
	extern boolean_t spa_vdev_remove_active(spa_t *spa);
	extern int spa_vdev_initialize(spa_t spa, nvlist_t nv, uint64_t cmd_type,
	nvlist_t *vdev_errlist);
	extern int spa_vdev_trim(spa_t spa, nvlist_t nv, uint64_t cmd_type,
	uint64_t rate, boolean_t partial, boolean_t secure, nvlist_t *vdev_errlist);
	extern int spa_vdev_setpath(spa_t spa, uint64_t guid, const char newpath);
	extern int spa_vdev_setfru(spa_t spa, uint64_t guid, const char newfru);
	extern int spa_vdev_split_mirror(spa_t spa, char newname, nvlist_t *config,
	nvlist_t *props, boolean_t exp);

	/* spare state (which is global across all pools) */
	extern void spa_spare_add(vdev_t *vd);
	extern void spa_spare_remove(vdev_t *vd);
	extern boolean_t spa_spare_exists(uint64_t guid, uint64_t pool, int refcnt);
	extern void spa_spare_activate(vdev_t *vd);

	/* L2ARC state (which is global across all pools) */
	extern void spa_l2cache_add(vdev_t *vd);
	extern void spa_l2cache_remove(vdev_t *vd);
	extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
	extern void spa_l2cache_activate(vdev_t *vd);
	extern void spa_l2cache_drop(spa_t *spa);

	/* scanning */
	extern int spa_scan(spa_t *spa, pool_scan_func_t func);
	extern int spa_scan_stop(spa_t *spa);
	extern int spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t flag);

	/* spa syncing */
	extern void spa_sync(spa_t spa, uint64_t txg); / only for DMU use */
	extern void spa_sync_allpools(void);

	extern int zfs_sync_pass_deferred_free;

	/* spa namespace global mutex */
	extern kmutex_t spa_namespace_lock;

	/*
	* SPA configuration functions in spa_config.c
	*/

	#define SPA_CONFIG_UPDATE_POOL 0
	#define SPA_CONFIG_UPDATE_VDEVS 1

	extern void spa_write_cachefile(spa_t *, boolean_t, boolean_t);
	extern void spa_config_load(void);
	extern nvlist_t spa_all_configs(uint64_t );
	extern void spa_config_set(spa_t spa, nvlist_t config);
	extern nvlist_t spa_config_generate(spa_t spa, vdev_t *vd, uint64_t txg,
	int getstats);
	extern void spa_config_update(spa_t *spa, int what);
	extern int spa_config_parse(spa_t spa, vdev_t vdp, nvlist_t nv,
	vdev_t *parent, uint_t id, int atype);


	/*
	* Miscellaneous SPA routines in spa_misc.c
	*/

	/* Namespace manipulation */
	extern spa_t spa_lookup(const char name);
	extern spa_t spa_add(const char name, nvlist_t config, const char altroot);
	extern void spa_remove(spa_t *spa);
	extern spa_t spa_next(spa_t prev);

	/* Refcount functions */
	extern void spa_open_ref(spa_t spa, void tag);
	extern void spa_close(spa_t spa, void tag);
	extern void spa_async_close(spa_t spa, void tag);
	extern boolean_t spa_refcount_zero(spa_t *spa);

	#define SCL_NONE 0x00
	#define SCL_CONFIG 0x01
	#define SCL_STATE 0x02
	#define SCL_L2ARC 0x04 /* hack until L2ARC 2.0 */
	#define SCL_ALLOC 0x08
	#define SCL_ZIO 0x10
	#define SCL_FREE 0x20
	#define SCL_VDEV 0x40
	#define SCL_LOCKS 7
	#define SCL_ALL ((1 << SCL_LOCKS) - 1)
	#define SCL_STATE_ALL (SCL_STATE \| SCL_L2ARC \| SCL_ZIO)

	/* Historical pool statistics */
	typedef struct spa_history_kstat {
	kmutex_t lock;
	uint64_t count;
	uint64_t size;
	kstat_t *kstat;
	void *priv;
	list_t list;
	} spa_history_kstat_t;

	typedef struct spa_history_list {
	uint64_t size;
	procfs_list_t procfs_list;
	} spa_history_list_t;

	typedef struct spa_stats {
	spa_history_list_t read_history;
	spa_history_list_t txg_history;
	spa_history_kstat_t tx_assign_histogram;
	spa_history_list_t mmp_history;
	spa_history_kstat_t state; /* pool state */
	spa_history_kstat_t iostats;
	} spa_stats_t;

	typedef enum txg_state {
	TXG_STATE_BIRTH = 0,
	TXG_STATE_OPEN = 1,
	TXG_STATE_QUIESCED = 2,
	TXG_STATE_WAIT_FOR_SYNC = 3,
	TXG_STATE_SYNCED = 4,
	TXG_STATE_COMMITTED = 5,
	} txg_state_t;

	typedef struct txg_stat {
	vdev_stat_t vs1;
	vdev_stat_t vs2;
	uint64_t txg;
	uint64_t ndirty;
	} txg_stat_t;

	/* Assorted pool IO kstats */
	typedef struct spa_iostats {
	kstat_named_t trim_extents_written;
	kstat_named_t trim_bytes_written;
	kstat_named_t trim_extents_skipped;
	kstat_named_t trim_bytes_skipped;
	kstat_named_t trim_extents_failed;
	kstat_named_t trim_bytes_failed;
	kstat_named_t autotrim_extents_written;
	kstat_named_t autotrim_bytes_written;
	kstat_named_t autotrim_extents_skipped;
	kstat_named_t autotrim_bytes_skipped;
	kstat_named_t autotrim_extents_failed;
	kstat_named_t autotrim_bytes_failed;
	kstat_named_t simple_trim_extents_written;
	kstat_named_t simple_trim_bytes_written;
	kstat_named_t simple_trim_extents_skipped;
	kstat_named_t simple_trim_bytes_skipped;
	kstat_named_t simple_trim_extents_failed;
	kstat_named_t simple_trim_bytes_failed;
	} spa_iostats_t;

	extern void spa_stats_init(spa_t *spa);
	extern void spa_stats_destroy(spa_t *spa);
	extern void spa_read_history_add(spa_t spa, const zbookmark_phys_t zb,
	uint32_t aflags);
	extern void spa_txg_history_add(spa_t *spa, uint64_t txg, hrtime_t birth_time);
	extern int spa_txg_history_set(spa_t *spa, uint64_t txg,
	txg_state_t completed_state, hrtime_t completed_time);
	extern txg_stat_t spa_txg_history_init_io(spa_t , uint64_t,
	struct dsl_pool *);
	extern void spa_txg_history_fini_io(spa_t , txg_stat_t );
	extern void spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs);
	extern int spa_mmp_history_set_skip(spa_t *spa, uint64_t mmp_kstat_id);
	extern int spa_mmp_history_set(spa_t *spa, uint64_t mmp_kstat_id, int io_error,
	hrtime_t duration);
	extern void spa_mmp_history_add(spa_t *spa, uint64_t txg, uint64_t timestamp,
	uint64_t mmp_delay, vdev_t *vd, int label, uint64_t mmp_kstat_id,
	int error);
	extern void spa_iostats_trim_add(spa_t *spa, trim_type_t type,
	uint64_t extents_written, uint64_t bytes_written,
	uint64_t extents_skipped, uint64_t bytes_skipped,
	uint64_t extents_failed, uint64_t bytes_failed);
	extern void spa_import_progress_add(spa_t *spa);
	extern void spa_import_progress_remove(uint64_t spa_guid);
	extern int spa_import_progress_set_mmp_check(uint64_t pool_guid,
	uint64_t mmp_sec_remaining);
	extern int spa_import_progress_set_max_txg(uint64_t pool_guid,
	uint64_t max_txg);
	extern int spa_import_progress_set_state(uint64_t pool_guid,
	spa_load_state_t spa_load_state);

	/* Pool configuration locks */
	extern int spa_config_tryenter(spa_t spa, int locks, void tag, krw_t rw);
	extern void spa_config_enter(spa_t spa, int locks, const void tag, krw_t rw);
	extern void spa_config_exit(spa_t spa, int locks, const void tag);
	extern int spa_config_held(spa_t *spa, int locks, krw_t rw);

	/* Pool vdev add/remove lock */
	extern uint64_t spa_vdev_enter(spa_t *spa);
	extern uint64_t spa_vdev_detach_enter(spa_t *spa, uint64_t guid);
	extern uint64_t spa_vdev_config_enter(spa_t *spa);
	extern void spa_vdev_config_exit(spa_t spa, vdev_t vd, uint64_t txg,
	int error, char *tag);
	extern int spa_vdev_exit(spa_t spa, vdev_t vd, uint64_t txg, int error);

	/* Pool vdev state change lock */
	extern void spa_vdev_state_enter(spa_t *spa, int oplock);
	extern int spa_vdev_state_exit(spa_t spa, vdev_t vd, int error);

	/* Log state */
	typedef enum spa_log_state {
	SPA_LOG_UNKNOWN = 0, /* unknown log state */
	SPA_LOG_MISSING, /* missing log(s) */
	SPA_LOG_CLEAR, /* clear the log(s) */
	SPA_LOG_GOOD, /* log(s) are good */
	} spa_log_state_t;

	extern spa_log_state_t spa_get_log_state(spa_t *spa);
	extern void spa_set_log_state(spa_t *spa, spa_log_state_t state);
	extern int spa_reset_logs(spa_t *spa);

	/* Log claim callback */
	extern void spa_claim_notify(zio_t *zio);
	extern void spa_deadman(void *);

	/* Accessor functions */
	extern boolean_t spa_shutting_down(spa_t *spa);
	extern struct dsl_pool spa_get_dsl(spa_t spa);
	extern boolean_t spa_is_initializing(spa_t *spa);
	extern boolean_t spa_indirect_vdevs_loaded(spa_t *spa);
	extern blkptr_t spa_get_rootblkptr(spa_t spa);
	extern void spa_set_rootblkptr(spa_t spa, const blkptr_t bp);
	extern void spa_altroot(spa_t , char , size_t);
	extern int spa_sync_pass(spa_t *spa);
	extern char spa_name(spa_t spa);
	extern uint64_t spa_guid(spa_t *spa);
	extern uint64_t spa_load_guid(spa_t *spa);
	extern uint64_t spa_last_synced_txg(spa_t *spa);
	extern uint64_t spa_first_txg(spa_t *spa);
	extern uint64_t spa_syncing_txg(spa_t *spa);
	extern uint64_t spa_final_dirty_txg(spa_t *spa);
	extern uint64_t spa_version(spa_t *spa);
	extern pool_state_t spa_state(spa_t *spa);
	extern spa_load_state_t spa_load_state(spa_t *spa);
	extern uint64_t spa_freeze_txg(spa_t *spa);
	extern uint64_t spa_get_worst_case_asize(spa_t *spa, uint64_t lsize);
	extern uint64_t spa_get_dspace(spa_t *spa);
	extern uint64_t spa_get_checkpoint_space(spa_t *spa);
	extern uint64_t spa_get_slop_space(spa_t *spa);
	extern void spa_update_dspace(spa_t *spa);
	extern uint64_t spa_version(spa_t *spa);
	extern boolean_t spa_deflate(spa_t *spa);
	extern metaslab_class_t spa_normal_class(spa_t spa);
	extern metaslab_class_t spa_log_class(spa_t spa);
	extern metaslab_class_t spa_embedded_log_class(spa_t spa);
	extern metaslab_class_t spa_special_class(spa_t spa);
	extern metaslab_class_t spa_dedup_class(spa_t spa);
	extern metaslab_class_t spa_preferred_class(spa_t spa, uint64_t size,
	dmu_object_type_t objtype, uint_t level, uint_t special_smallblk);

	extern void spa_evicting_os_register(spa_t , objset_t os);
	extern void spa_evicting_os_deregister(spa_t , objset_t os);
	extern void spa_evicting_os_wait(spa_t *spa);
	extern int spa_max_replication(spa_t *spa);
	extern int spa_prev_software_version(spa_t *spa);
	extern uint64_t spa_get_failmode(spa_t *spa);
	extern uint64_t spa_get_deadman_failmode(spa_t *spa);
	extern void spa_set_deadman_failmode(spa_t spa, const char failmode);
	extern boolean_t spa_suspended(spa_t *spa);
	extern uint64_t spa_bootfs(spa_t *spa);
	extern uint64_t spa_delegation(spa_t *spa);
	extern objset_t spa_meta_objset(spa_t spa);
	extern space_map_t spa_syncing_log_sm(spa_t spa);
	extern uint64_t spa_deadman_synctime(spa_t *spa);
	extern uint64_t spa_deadman_ziotime(spa_t *spa);
	extern uint64_t spa_dirty_data(spa_t *spa);
	extern spa_autotrim_t spa_get_autotrim(spa_t *spa);

	/* Miscellaneous support routines */
	extern void spa_load_failed(spa_t spa, const char fmt, ...);
	extern void spa_load_note(spa_t spa, const char fmt, ...);
	extern void spa_activate_mos_feature(spa_t spa, const char feature,
	dmu_tx_t *tx);
	extern void spa_deactivate_mos_feature(spa_t spa, const char feature);
	extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid);
	extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
	extern char spa_strdup(const char );
	extern void spa_strfree(char *);
	-extern uint64_t spa_get_random(uint64_t range);
	extern uint64_t spa_generate_guid(spa_t *spa);
	extern void snprintf_blkptr(char buf, size_t buflen, const blkptr_t bp);
	extern void spa_freeze(spa_t *spa);
	extern int spa_change_guid(spa_t *spa);
	extern void spa_upgrade(spa_t *spa, uint64_t version);
	extern void spa_evict_all(void);
	extern vdev_t spa_lookup_by_guid(spa_t spa, uint64_t guid,
	boolean_t l2cache);
	extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
	extern uint64_t dva_get_dsize_sync(spa_t spa, const dva_t dva);
	extern uint64_t bp_get_dsize_sync(spa_t spa, const blkptr_t bp);
	extern uint64_t bp_get_dsize(spa_t spa, const blkptr_t bp);
	extern boolean_t spa_has_slogs(spa_t *spa);
	extern boolean_t spa_is_root(spa_t *spa);
	extern boolean_t spa_writeable(spa_t *spa);
	extern boolean_t spa_has_pending_synctask(spa_t *spa);
	extern int spa_maxblocksize(spa_t *spa);
	extern int spa_maxdnodesize(spa_t *spa);
	extern boolean_t spa_has_checkpoint(spa_t *spa);
	extern boolean_t spa_importing_readonly_checkpoint(spa_t *spa);
	extern boolean_t spa_suspend_async_destroy(spa_t *spa);
	extern uint64_t spa_min_claim_txg(spa_t *spa);
	extern boolean_t zfs_dva_valid(spa_t spa, const dva_t dva,
	const blkptr_t *bp);
	typedef void (*spa_remap_cb_t)(uint64_t vdev, uint64_t offset, uint64_t size,
	void *arg);
	extern boolean_t spa_remap_blkptr(spa_t spa, blkptr_t bp,
	spa_remap_cb_t callback, void *arg);
	extern uint64_t spa_get_last_removal_txg(spa_t *spa);
	extern boolean_t spa_trust_config(spa_t *spa);
	extern uint64_t spa_missing_tvds_allowed(spa_t *spa);
	extern void spa_set_missing_tvds(spa_t *spa, uint64_t missing);
	extern boolean_t spa_top_vdevs_spacemap_addressable(spa_t *spa);
	extern uint64_t spa_total_metaslabs(spa_t *spa);
	extern boolean_t spa_multihost(spa_t *spa);
	extern uint32_t spa_get_hostid(spa_t *spa);
	extern void spa_activate_allocation_classes(spa_t , dmu_tx_t );
	extern boolean_t spa_livelist_delete_check(spa_t *spa);

	extern spa_mode_t spa_mode(spa_t *spa);
	extern uint64_t zfs_strtonum(const char str, char *nptr);

	extern char *spa_his_ievent_table[];

	extern void spa_history_create_obj(spa_t spa, dmu_tx_t tx);
	extern int spa_history_get(spa_t spa, uint64_t offset, uint64_t *len_read,
	char *his_buf);
	extern int spa_history_log(spa_t spa, const char his_buf);
	extern int spa_history_log_nvl(spa_t spa, nvlist_t nvl);
	extern void spa_history_log_version(spa_t spa, const char operation,
	dmu_tx_t *tx);
	extern void spa_history_log_internal(spa_t spa, const char operation,
	dmu_tx_t tx, const char fmt, ...) __printflike(4, 5);
	extern void spa_history_log_internal_ds(struct dsl_dataset ds, const char op,
	dmu_tx_t tx, const char fmt, ...) __printflike(4, 5);
	extern void spa_history_log_internal_dd(dsl_dir_t dd, const char operation,
	dmu_tx_t tx, const char fmt, ...) __printflike(4, 5);

	extern const char spa_state_to_name(spa_t spa);

	/* error handling */
	struct zbookmark_phys;
	extern void spa_log_error(spa_t spa, const zbookmark_phys_t zb);
	extern int zfs_ereport_post(const char clazz, spa_t spa, vdev_t *vd,
	const zbookmark_phys_t zb, zio_t zio, uint64_t state);
	extern boolean_t zfs_ereport_is_valid(const char clazz, spa_t spa, vdev_t *vd,
	zio_t *zio);
	extern void zfs_ereport_taskq_fini(void);
	extern void zfs_ereport_clear(spa_t spa, vdev_t vd);
	extern nvlist_t zfs_event_create(spa_t spa, vdev_t vd, const char type,
	const char name, nvlist_t aux);
	extern void zfs_post_remove(spa_t spa, vdev_t vd);
	extern void zfs_post_state_change(spa_t spa, vdev_t vd, uint64_t laststate);
	extern void zfs_post_autoreplace(spa_t spa, vdev_t vd);
	extern uint64_t spa_get_errlog_size(spa_t *spa);
	extern int spa_get_errlog(spa_t spa, void uaddr, size_t *count);
	extern void spa_errlog_rotate(spa_t *spa);
	extern void spa_errlog_drain(spa_t *spa);
	extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
	extern void spa_get_errlists(spa_t spa, avl_tree_t last, avl_tree_t *scrub);

	/* vdev cache */
	extern void vdev_cache_stat_init(void);
	extern void vdev_cache_stat_fini(void);

	/* vdev mirror */
	extern void vdev_mirror_stat_init(void);
	extern void vdev_mirror_stat_fini(void);

	/* Initialization and termination */
	extern void spa_init(spa_mode_t mode);
	extern void spa_fini(void);
	extern void spa_boot_init(void);

	/* properties */
	extern int spa_prop_set(spa_t spa, nvlist_t nvp);
	extern int spa_prop_get(spa_t spa, nvlist_t *nvp);
	extern void spa_prop_clear_bootfs(spa_t spa, uint64_t obj, dmu_tx_t tx);
	extern void spa_configfile_set(spa_t , nvlist_t , boolean_t);

	/* asynchronous event notification */
	extern void spa_event_notify(spa_t spa, vdev_t vdev, nvlist_t *hist_nvl,
	const char *name);

	/* waiting for pool activities to complete */
	extern int spa_wait(const char *pool, zpool_wait_activity_t activity,
	boolean_t *waited);
	extern int spa_wait_tag(const char *name, zpool_wait_activity_t activity,
	uint64_t tag, boolean_t *waited);
	extern void spa_notify_waiters(spa_t *spa);
	extern void spa_wake_waiters(spa_t *spa);

	/* module param call functions */
	int param_set_deadman_ziotime(ZFS_MODULE_PARAM_ARGS);
	int param_set_deadman_synctime(ZFS_MODULE_PARAM_ARGS);
	int param_set_slop_shift(ZFS_MODULE_PARAM_ARGS);
	int param_set_deadman_failmode(ZFS_MODULE_PARAM_ARGS);

	#ifdef ZFS_DEBUG
	#define dprintf_bp(bp, fmt, ...) do { \
	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \
	snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp)); \
	dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf); \
	kmem_free(__blkbuf, BP_SPRINTF_LEN); \
	} \
	_NOTE(CONSTCOND) } while (0)
	#else
	#define dprintf_bp(bp, fmt, ...)
	#endif

	extern spa_mode_t spa_mode_global;
	extern int zfs_deadman_enabled;
	extern unsigned long zfs_deadman_synctime_ms;
	extern unsigned long zfs_deadman_ziotime_ms;
	extern unsigned long zfs_deadman_checktime_ms;

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_SPA_H */
	diff --git a/sys/contrib/openzfs/include/sys/spa_impl.h b/sys/contrib/openzfs/include/sys/spa_impl.h
	index bc88cfa15e8e..cb2c49e5852a 100644
	--- a/sys/contrib/openzfs/include/sys/spa_impl.h
	+++ b/sys/contrib/openzfs/include/sys/spa_impl.h
	@@ -1,462 +1,465 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	* Copyright 2013 Saso Kiselkov. All rights reserved.
	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	* Copyright (c) 2017 Datto Inc.
	* Copyright (c) 2017, Intel Corporation.
	*/

	#ifndef _SYS_SPA_IMPL_H
	#define _SYS_SPA_IMPL_H

	#include <sys/spa.h>
	#include <sys/spa_checkpoint.h>
	#include <sys/spa_log_spacemap.h>
	#include <sys/vdev.h>
	#include <sys/vdev_rebuild.h>
	#include <sys/vdev_removal.h>
	#include <sys/metaslab.h>
	#include <sys/dmu.h>
	#include <sys/dsl_pool.h>
	#include <sys/uberblock_impl.h>
	#include <sys/zfs_context.h>
	#include <sys/avl.h>
	#include <sys/zfs_refcount.h>
	#include <sys/bplist.h>
	#include <sys/bpobj.h>
	#include <sys/dsl_crypt.h>
	#include <sys/zfeature.h>
	#include <sys/zthr.h>
	#include <sys/dsl_deadlist.h>
	#include <zfeature_common.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	+typedef struct spa_alloc {
	+ kmutex_t spaa_lock;
	+ avl_tree_t spaa_tree;
	+} ____cacheline_aligned spa_alloc_t;
	+
	typedef struct spa_error_entry {
	zbookmark_phys_t se_bookmark;
	char *se_name;
	avl_node_t se_avl;
	} spa_error_entry_t;

	typedef struct spa_history_phys {
	uint64_t sh_pool_create_len; /* ending offset of zpool create */
	uint64_t sh_phys_max_off; /* physical EOF */
	uint64_t sh_bof; /* logical BOF */
	uint64_t sh_eof; /* logical EOF */
	uint64_t sh_records_lost; /* num of records overwritten */
	} spa_history_phys_t;

	/*
	* All members must be uint64_t, for byteswap purposes.
	*/
	typedef struct spa_removing_phys {
	uint64_t sr_state; /* dsl_scan_state_t */

	/*
	* The vdev ID that we most recently attempted to remove,
	* or -1 if no removal has been attempted.
	*/
	uint64_t sr_removing_vdev;

	/*
	* The vdev ID that we most recently successfully removed,
	* or -1 if no devices have been removed.
	*/
	uint64_t sr_prev_indirect_vdev;

	uint64_t sr_start_time;
	uint64_t sr_end_time;

	/*
	* Note that we can not use the space map's or indirect mapping's
	* accounting as a substitute for these values, because we need to
	* count frees of not-yet-copied data as though it did the copy.
	* Otherwise, we could get into a situation where copied > to_copy,
	* or we complete before copied == to_copy.
	*/
	uint64_t sr_to_copy; /* bytes that need to be copied */
	uint64_t sr_copied; /* bytes that have been copied or freed */
	} spa_removing_phys_t;

	/*
	* This struct is stored as an entry in the DMU_POOL_DIRECTORY_OBJECT
	* (with key DMU_POOL_CONDENSING_INDIRECT). It is present if a condense
	* of an indirect vdev's mapping object is in progress.
	*/
	typedef struct spa_condensing_indirect_phys {
	/*
	* The vdev ID of the indirect vdev whose indirect mapping is
	* being condensed.
	*/
	uint64_t scip_vdev;

	/*
	* The vdev's old obsolete spacemap. This spacemap's contents are
	* being integrated into the new mapping.
	*/
	uint64_t scip_prev_obsolete_sm_object;

	/*
	* The new mapping object that is being created.
	*/
	uint64_t scip_next_mapping_object;
	} spa_condensing_indirect_phys_t;

	struct spa_aux_vdev {
	uint64_t sav_object; /* MOS object for device list */
	nvlist_t sav_config; / cached device config */
	vdev_t *sav_vdevs; / devices */
	int sav_count; /* number devices */
	boolean_t sav_sync; /* sync the device list */
	nvlist_t *sav_pending; / pending device additions */
	uint_t sav_npending; /* # pending devices */
	};

	typedef struct spa_config_lock {
	kmutex_t scl_lock;
	kthread_t *scl_writer;
	int scl_write_wanted;
	kcondvar_t scl_cv;
	zfs_refcount_t scl_count;
	} spa_config_lock_t;

	typedef struct spa_config_dirent {
	list_node_t scd_link;
	char *scd_path;
	} spa_config_dirent_t;

	typedef enum zio_taskq_type {
	ZIO_TASKQ_ISSUE = 0,
	ZIO_TASKQ_ISSUE_HIGH,
	ZIO_TASKQ_INTERRUPT,
	ZIO_TASKQ_INTERRUPT_HIGH,
	ZIO_TASKQ_TYPES
	} zio_taskq_type_t;

	/*
	* State machine for the zpool-poolname process. The states transitions
	* are done as follows:
	*
	* From To Routine
	* PROC_NONE -> PROC_CREATED spa_activate()
	* PROC_CREATED -> PROC_ACTIVE spa_thread()
	* PROC_ACTIVE -> PROC_DEACTIVATE spa_deactivate()
	* PROC_DEACTIVATE -> PROC_GONE spa_thread()
	* PROC_GONE -> PROC_NONE spa_deactivate()
	*/
	typedef enum spa_proc_state {
	SPA_PROC_NONE, /* spa_proc = &p0, no process created */
	SPA_PROC_CREATED, /* spa_activate() has proc, is waiting */
	SPA_PROC_ACTIVE, /* taskqs created, spa_proc set */
	SPA_PROC_DEACTIVATE, /* spa_deactivate() requests process exit */
	SPA_PROC_GONE /* spa_thread() is exiting, spa_proc = &p0 */
	} spa_proc_state_t;

	typedef struct spa_taskqs {
	uint_t stqs_count;
	taskq_t **stqs_taskq;
	} spa_taskqs_t;

	typedef enum spa_all_vdev_zap_action {
	AVZ_ACTION_NONE = 0,
	AVZ_ACTION_DESTROY, /* Destroy all per-vdev ZAPs and the AVZ. */
	AVZ_ACTION_REBUILD, /* Populate the new AVZ, see spa_avz_rebuild */
	AVZ_ACTION_INITIALIZE
	} spa_avz_action_t;

	typedef enum spa_config_source {
	SPA_CONFIG_SRC_NONE = 0,
	SPA_CONFIG_SRC_SCAN, /* scan of path (default: /dev/dsk) */
	SPA_CONFIG_SRC_CACHEFILE, /* any cachefile */
	SPA_CONFIG_SRC_TRYIMPORT, /* returned from call to tryimport */
	SPA_CONFIG_SRC_SPLIT, /* new pool in a pool split */
	SPA_CONFIG_SRC_MOS /* MOS, but not always from right txg */
	} spa_config_source_t;

	struct spa {
	/*
	* Fields protected by spa_namespace_lock.
	*/
	char spa_name[ZFS_MAX_DATASET_NAME_LEN]; /* pool name */
	char spa_comment; / comment */
	avl_node_t spa_avl; /* node in spa_namespace_avl */
	nvlist_t spa_config; / last synced config */
	nvlist_t spa_config_syncing; / currently syncing config */
	nvlist_t spa_config_splitting; / config for splitting */
	nvlist_t spa_load_info; / info and errors from load */
	uint64_t spa_config_txg; /* txg of last config change */
	int spa_sync_pass; /* iterate-to-convergence */
	pool_state_t spa_state; /* pool state */
	int spa_inject_ref; /* injection references */
	uint8_t spa_sync_on; /* sync threads are running */
	spa_load_state_t spa_load_state; /* current load operation */
	boolean_t spa_indirect_vdevs_loaded; /* mappings loaded? */
	boolean_t spa_trust_config; /* do we trust vdev tree? */
	boolean_t spa_is_splitting; /* in the middle of a split? */
	spa_config_source_t spa_config_source; /* where config comes from? */
	uint64_t spa_import_flags; /* import specific flags */
	spa_taskqs_t spa_zio_taskq[ZIO_TYPES][ZIO_TASKQ_TYPES];
	dsl_pool_t *spa_dsl_pool;
	boolean_t spa_is_initializing; /* true while opening pool */
	boolean_t spa_is_exporting; /* true while exporting pool */
	metaslab_class_t spa_normal_class; / normal data class */
	metaslab_class_t spa_log_class; / intent log data class */
	metaslab_class_t spa_embedded_log_class; / log on normal vdevs */
	metaslab_class_t spa_special_class; / special allocation class */
	metaslab_class_t spa_dedup_class; / dedup allocation class */
	uint64_t spa_first_txg; /* first txg after spa_open() */
	uint64_t spa_final_txg; /* txg of export/destroy */
	uint64_t spa_freeze_txg; /* freeze pool at this txg */
	uint64_t spa_load_max_txg; /* best initial ub_txg */
	uint64_t spa_claim_max_txg; /* highest claimed birth txg */
	inode_timespec_t spa_loaded_ts; /* 1st successful open time */
	objset_t spa_meta_objset; / copy of dp->dp_meta_objset */
	kmutex_t spa_evicting_os_lock; /* Evicting objset list lock */
	list_t spa_evicting_os_list; /* Objsets being evicted. */
	kcondvar_t spa_evicting_os_cv; /* Objset Eviction Completion */
	txg_list_t spa_vdev_txg_list; /* per-txg dirty vdev list */
	vdev_t spa_root_vdev; / top-level vdev container */
	uint64_t spa_min_ashift; /* of vdevs in normal class */
	uint64_t spa_max_ashift; /* of vdevs in normal class */
	uint64_t spa_min_alloc; /* of vdevs in normal class */
	uint64_t spa_config_guid; /* config pool guid */
	uint64_t spa_load_guid; /* spa_load initialized guid */
	uint64_t spa_last_synced_guid; /* last synced guid */
	list_t spa_config_dirty_list; /* vdevs with dirty config */
	list_t spa_state_dirty_list; /* vdevs with dirty state */
	/*
	- * spa_alloc_locks and spa_alloc_trees are arrays, whose lengths are
	- * stored in spa_alloc_count. There is one tree and one lock for each
	- * allocator, to help improve allocation performance in write-heavy
	- * workloads.
	+ * spa_allocs is an array, whose lengths is stored in spa_alloc_count.
	+ * There is one tree and one lock for each allocator, to help improve
	+ * allocation performance in write-heavy workloads.
	*/
	- kmutex_t *spa_alloc_locks;
	- avl_tree_t *spa_alloc_trees;
	+ spa_alloc_t *spa_allocs;
	int spa_alloc_count;

	spa_aux_vdev_t spa_spares; /* hot spares */
	spa_aux_vdev_t spa_l2cache; /* L2ARC cache devices */
	nvlist_t spa_label_features; / Features for reading MOS */
	uint64_t spa_config_object; /* MOS object for pool config */
	uint64_t spa_config_generation; /* config generation number */
	uint64_t spa_syncing_txg; /* txg currently syncing */
	bpobj_t spa_deferred_bpobj; /* deferred-free bplist */
	bplist_t spa_free_bplist[TXG_SIZE]; /* bplist of stuff to free */
	zio_cksum_salt_t spa_cksum_salt; /* secret salt for cksum */
	/* checksum context templates */
	kmutex_t spa_cksum_tmpls_lock;
	void *spa_cksum_tmpls[ZIO_CHECKSUM_FUNCTIONS];
	uberblock_t spa_ubsync; /* last synced uberblock */
	uberblock_t spa_uberblock; /* current uberblock */
	boolean_t spa_extreme_rewind; /* rewind past deferred frees */
	kmutex_t spa_scrub_lock; /* resilver/scrub lock */
	uint64_t spa_scrub_inflight; /* in-flight scrub bytes */

	/* in-flight verification bytes */
	uint64_t spa_load_verify_bytes;
	kcondvar_t spa_scrub_io_cv; /* scrub I/O completion */
	uint8_t spa_scrub_active; /* active or suspended? */
	uint8_t spa_scrub_type; /* type of scrub we're doing */
	uint8_t spa_scrub_finished; /* indicator to rotate logs */
	uint8_t spa_scrub_started; /* started since last boot */
	uint8_t spa_scrub_reopen; /* scrub doing vdev_reopen */
	uint64_t spa_scan_pass_start; /* start time per pass/reboot */
	uint64_t spa_scan_pass_scrub_pause; /* scrub pause time */
	uint64_t spa_scan_pass_scrub_spent_paused; /* total paused */
	uint64_t spa_scan_pass_exam; /* examined bytes per pass */
	uint64_t spa_scan_pass_issued; /* issued bytes per pass */

	/*
	* We are in the middle of a resilver, and another resilver
	* is needed once this one completes. This is set iff any
	* vdev_resilver_deferred is set.
	*/
	boolean_t spa_resilver_deferred;
	kmutex_t spa_async_lock; /* protect async state */
	kthread_t spa_async_thread; / thread doing async task */
	int spa_async_suspended; /* async tasks suspended */
	kcondvar_t spa_async_cv; /* wait for thread_exit() */
	uint16_t spa_async_tasks; /* async task mask */
	uint64_t spa_missing_tvds; /* unopenable tvds on load */
	uint64_t spa_missing_tvds_allowed; /* allow loading spa? */

	spa_removing_phys_t spa_removing_phys;
	spa_vdev_removal_t *spa_vdev_removal;

	spa_condensing_indirect_phys_t spa_condensing_indirect_phys;
	spa_condensing_indirect_t *spa_condensing_indirect;
	zthr_t spa_condense_zthr; / zthr doing condense. */

	uint64_t spa_checkpoint_txg; /* the txg of the checkpoint */
	spa_checkpoint_info_t spa_checkpoint_info; /* checkpoint accounting */
	zthr_t *spa_checkpoint_discard_zthr;

	space_map_t spa_syncing_log_sm; / current log space map */
	avl_tree_t spa_sm_logs_by_txg;
	kmutex_t spa_flushed_ms_lock; /* for metaslabs_by_flushed */
	avl_tree_t spa_metaslabs_by_flushed;
	spa_unflushed_stats_t spa_unflushed_stats;
	list_t spa_log_summary;
	uint64_t spa_log_flushall_txg;

	zthr_t spa_livelist_delete_zthr; / deleting livelists */
	zthr_t spa_livelist_condense_zthr; / condensing livelists */
	uint64_t spa_livelists_to_delete; /* set of livelists to free */
	livelist_condense_entry_t spa_to_condense; /* next to condense */

	char spa_root; / alternate root directory */
	uint64_t spa_ena; /* spa-wide ereport ENA */
	int spa_last_open_failed; /* error if last open failed */
	uint64_t spa_last_ubsync_txg; /* "best" uberblock txg */
	uint64_t spa_last_ubsync_txg_ts; /* timestamp from that ub */
	uint64_t spa_load_txg; /* ub txg that loaded */
	uint64_t spa_load_txg_ts; /* timestamp from that ub */
	uint64_t spa_load_meta_errors; /* verify metadata err count */
	uint64_t spa_load_data_errors; /* verify data err count */
	uint64_t spa_verify_min_txg; /* start txg of verify scrub */
	kmutex_t spa_errlog_lock; /* error log lock */
	uint64_t spa_errlog_last; /* last error log object */
	uint64_t spa_errlog_scrub; /* scrub error log object */
	kmutex_t spa_errlist_lock; /* error list/ereport lock */
	avl_tree_t spa_errlist_last; /* last error list */
	avl_tree_t spa_errlist_scrub; /* scrub error list */
	uint64_t spa_deflate; /* should we deflate? */
	uint64_t spa_history; /* history object */
	kmutex_t spa_history_lock; /* history lock */
	vdev_t spa_pending_vdev; / pending vdev additions */
	kmutex_t spa_props_lock; /* property lock */
	uint64_t spa_pool_props_object; /* object for properties */
	uint64_t spa_bootfs; /* default boot filesystem */
	uint64_t spa_failmode; /* failure mode for the pool */
	uint64_t spa_deadman_failmode; /* failure mode for deadman */
	uint64_t spa_delegation; /* delegation on/off */
	list_t spa_config_list; /* previous cache file(s) */
	/* per-CPU array of root of async I/O: */
	zio_t **spa_async_zio_root;
	zio_t spa_suspend_zio_root; / root of all suspended I/O */
	zio_t spa_txg_zio[TXG_SIZE]; / spa_sync() waits for this */
	kmutex_t spa_suspend_lock; /* protects suspend_zio_root */
	kcondvar_t spa_suspend_cv; /* notification of resume */
	zio_suspend_reason_t spa_suspended; /* pool is suspended */
	uint8_t spa_claiming; /* pool is doing zil_claim() */
	boolean_t spa_is_root; /* pool is root */
	int spa_minref; /* num refs when first opened */
	spa_mode_t spa_mode; /* SPA_MODE_{READ\|WRITE} */
	spa_log_state_t spa_log_state; /* log state */
	uint64_t spa_autoexpand; /* lun expansion on/off */
	ddt_t spa_ddt[ZIO_CHECKSUM_FUNCTIONS]; / in-core DDTs */
	uint64_t spa_ddt_stat_object; /* DDT statistics */
	uint64_t spa_dedup_dspace; /* Cache get_dedup_dspace() */
	uint64_t spa_dedup_checksum; /* default dedup checksum */
	uint64_t spa_dspace; /* dspace in normal class */
	kmutex_t spa_vdev_top_lock; /* dueling offline/remove */
	kmutex_t spa_proc_lock; /* protects spa_proc* */
	kcondvar_t spa_proc_cv; /* spa_proc_state transitions */
	spa_proc_state_t spa_proc_state; /* see definition */
	proc_t spa_proc; / "zpool-poolname" process */
	uintptr_t spa_did; /* if procp != p0, did of t1 */
	boolean_t spa_autoreplace; /* autoreplace set in open */
	int spa_vdev_locks; /* locks grabbed */
	uint64_t spa_creation_version; /* version at pool creation */
	uint64_t spa_prev_software_version; /* See ub_software_version */
	uint64_t spa_feat_for_write_obj; /* required to write to pool */
	uint64_t spa_feat_for_read_obj; /* required to read from pool */
	uint64_t spa_feat_desc_obj; /* Feature descriptions */
	uint64_t spa_feat_enabled_txg_obj; /* Feature enabled txg */
	kmutex_t spa_feat_stats_lock; /* protects spa_feat_stats */
	nvlist_t spa_feat_stats; / Cache of enabled features */
	/* cache feature refcounts */
	uint64_t spa_feat_refcount_cache[SPA_FEATURES];
	taskqid_t spa_deadman_tqid; /* Task id */
	uint64_t spa_deadman_calls; /* number of deadman calls */
	hrtime_t spa_sync_starttime; /* starting time of spa_sync */
	uint64_t spa_deadman_synctime; /* deadman sync expiration */
	uint64_t spa_deadman_ziotime; /* deadman zio expiration */
	uint64_t spa_all_vdev_zaps; /* ZAP of per-vd ZAP obj #s */
	spa_avz_action_t spa_avz_action; /* destroy/rebuild AVZ? */
	uint64_t spa_autotrim; /* automatic background trim? */
	uint64_t spa_errata; /* errata issues detected */
	spa_stats_t spa_stats; /* assorted spa statistics */
	spa_keystore_t spa_keystore; /* loaded crypto keys */

	/* arc_memory_throttle() parameters during low memory condition */
	uint64_t spa_lowmem_page_load; /* memory load during txg */
	uint64_t spa_lowmem_last_txg; /* txg window start */

	hrtime_t spa_ccw_fail_time; /* Conf cache write fail time */
	taskq_t spa_zvol_taskq; / Taskq for minor management */
	taskq_t spa_prefetch_taskq; / Taskq for prefetch threads */
	uint64_t spa_multihost; /* multihost aware (mmp) */
	mmp_thread_t spa_mmp; /* multihost mmp thread */
	list_t spa_leaf_list; /* list of leaf vdevs */
	uint64_t spa_leaf_list_gen; /* track leaf_list changes */
	uint32_t spa_hostid; /* cached system hostid */

	/* synchronization for threads in spa_wait */
	kmutex_t spa_activities_lock;
	kcondvar_t spa_activities_cv;
	kcondvar_t spa_waiters_cv;
	int spa_waiters; /* number of waiting threads */
	boolean_t spa_waiters_cancel; /* waiters should return */

	char spa_compatibility; / compatibility file(s) */

	/*
	* spa_refcount & spa_config_lock must be the last elements
	* because zfs_refcount_t changes size based on compilation options.
	* In order for the MDB module to function correctly, the other
	* fields must remain in the same location.
	*/
	spa_config_lock_t spa_config_lock[SCL_LOCKS]; /* config changes */
	zfs_refcount_t spa_refcount; /* number of opens */

	taskq_t spa_upgrade_taskq; / taskq for upgrade jobs */
	};

	extern char *spa_config_path;
	extern char *zfs_deadman_failmode;
	extern int spa_slop_shift;
	extern void spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
	task_func_t func, void arg, uint_t flags, taskq_ent_t *ent);
	extern void spa_taskq_dispatch_sync(spa_t *, zio_type_t t, zio_taskq_type_t q,
	task_func_t func, void arg, uint_t flags);
	extern void spa_load_spares(spa_t *spa);
	extern void spa_load_l2cache(spa_t *spa);
	extern sysevent_t spa_event_create(spa_t spa, vdev_t vd, nvlist_t hist_nvl,
	const char *name);
	extern void spa_event_post(sysevent_t *ev);
	extern int param_set_deadman_failmode_common(const char *val);
	extern void spa_set_deadman_synctime(hrtime_t ns);
	extern void spa_set_deadman_ziotime(hrtime_t ns);
	extern const char *spa_history_zone(void);

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_SPA_IMPL_H */
	diff --git a/sys/contrib/openzfs/include/sys/zfs_context.h b/sys/contrib/openzfs/include/sys/zfs_context.h
	index ffb20e1fefad..e430d17a5f9b 100644
	--- a/sys/contrib/openzfs/include/sys/zfs_context.h
	+++ b/sys/contrib/openzfs/include/sys/zfs_context.h
	@@ -1,772 +1,787 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2012, Joyent, Inc. All rights reserved.
	*/

	#ifndef _SYS_ZFS_CONTEXT_H
	#define _SYS_ZFS_CONTEXT_H

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* This code compiles in three different contexts. When __KERNEL__ is defined,
	* the code uses "unix-like" kernel interfaces. When _STANDALONE is defined, the
	* code is running in a reduced capacity environment of the boot loader which is
	* generally a subset of both POSIX and kernel interfaces (with a few unique
	* interfaces too). When neither are defined, it's in a userland POSIX or
	* similar environment.
	*/
	#if defined(__KERNEL__) \|\| defined(_STANDALONE)
	#include <sys/note.h>
	#include <sys/types.h>
	#include <sys/atomic.h>
	#include <sys/sysmacros.h>
	#include <sys/vmsystm.h>
	#include <sys/condvar.h>
	#include <sys/cmn_err.h>
	#include <sys/kmem.h>
	#include <sys/kmem_cache.h>
	#include <sys/vmem.h>
	#include <sys/taskq.h>
	#include <sys/param.h>
	#include <sys/disp.h>
	#include <sys/debug.h>
	#include <sys/random.h>
	#include <sys/strings.h>
	#include <sys/byteorder.h>
	#include <sys/list.h>
	#include <sys/time.h>
	#include <sys/zone.h>
	#include <sys/kstat.h>
	#include <sys/zfs_debug.h>
	#include <sys/sysevent.h>
	#include <sys/sysevent/eventdefs.h>
	#include <sys/zfs_delay.h>
	#include <sys/sunddi.h>
	#include <sys/ctype.h>
	#include <sys/disp.h>
	#include <sys/trace.h>
	#include <sys/procfs_list.h>
	#include <sys/mod.h>
	#include <sys/uio_impl.h>
	#include <sys/zfs_context_os.h>
	#else /* _KERNEL \|\| _STANDALONE */

	#define _SYS_MUTEX_H
	#define _SYS_RWLOCK_H
	#define _SYS_CONDVAR_H
	#define _SYS_VNODE_H
	#define _SYS_VFS_H
	#define _SYS_SUNDDI_H
	#define _SYS_CALLB_H

	#include <stdio.h>
	#include <stdlib.h>
	#include <stddef.h>
	#include <stdarg.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <errno.h>
	#include <string.h>
	#include <strings.h>
	#include <pthread.h>
	#include <setjmp.h>
	#include <assert.h>
	#include <umem.h>
	#include <limits.h>
	#include <atomic.h>
	#include <dirent.h>
	#include <time.h>
	#include <ctype.h>
	#include <signal.h>
	#include <sys/mman.h>
	#include <sys/note.h>
	#include <sys/types.h>
	#include <sys/cred.h>
	#include <sys/sysmacros.h>
	#include <sys/resource.h>
	#include <sys/byteorder.h>
	#include <sys/list.h>
	#include <sys/mod.h>
	#include <sys/uio.h>
	#include <sys/zfs_debug.h>
	#include <sys/kstat.h>
	#include <sys/u8_textprep.h>
	#include <sys/sysevent.h>
	#include <sys/sysevent/eventdefs.h>
	#include <sys/sunddi.h>
	#include <sys/debug.h>
	#include <sys/utsname.h>
	#include <sys/trace_zfs.h>

	#include <sys/zfs_context_os.h>

	/*
	* Stack
	*/

	#define noinline __attribute__((noinline))
	#define likely(x) __builtin_expect((x), 1)
	#define unlikely(x) __builtin_expect((x), 0)

	/*
	* Debugging
	*/

	/*
	* Note that we are not using the debugging levels.
	*/

	#define CE_CONT 0 /* continuation */
	#define CE_NOTE 1 /* notice */
	#define CE_WARN 2 /* warning */
	#define CE_PANIC 3 /* panic */
	#define CE_IGNORE 4 /* print nothing */

	/*
	* ZFS debugging
	*/

	extern void dprintf_setup(int argc, char *argv);

	extern void cmn_err(int, const char *, ...);
	extern void vcmn_err(int, const char *, va_list);
	extern void panic(const char *, ...) __NORETURN;
	extern void vpanic(const char *, va_list) __NORETURN;

	#define fm_panic panic

	extern int aok;

	/*
	* DTrace SDT probes have different signatures in userland than they do in
	* the kernel. If they're being used in kernel code, re-define them out of
	* existence for their counterparts in libzpool.
	*
	* Here's an example of how to use the set-error probes in userland:
	* zfs$target:::set-error /arg0 == EBUSY/ {stack();}
	*
	* Here's an example of how to use DTRACE_PROBE probes in userland:
	* If there is a probe declared as follows:
	* DTRACE_PROBE2(zfs__probe_name, uint64_t, blkid, dnode_t *, dn);
	* Then you can use it as follows:
	* zfs$target:::probe2 /copyinstr(arg0) == "zfs__probe_name"/
	* {printf("%u %p\n", arg1, arg2);}
	*/

	#ifdef DTRACE_PROBE
	#undef DTRACE_PROBE
	#endif /* DTRACE_PROBE */
	#define DTRACE_PROBE(a)

	#ifdef DTRACE_PROBE1
	#undef DTRACE_PROBE1
	#endif /* DTRACE_PROBE1 */
	#define DTRACE_PROBE1(a, b, c)

	#ifdef DTRACE_PROBE2
	#undef DTRACE_PROBE2
	#endif /* DTRACE_PROBE2 */
	#define DTRACE_PROBE2(a, b, c, d, e)

	#ifdef DTRACE_PROBE3
	#undef DTRACE_PROBE3
	#endif /* DTRACE_PROBE3 */
	#define DTRACE_PROBE3(a, b, c, d, e, f, g)

	#ifdef DTRACE_PROBE4
	#undef DTRACE_PROBE4
	#endif /* DTRACE_PROBE4 */
	#define DTRACE_PROBE4(a, b, c, d, e, f, g, h, i)

	/*
	* Tunables.
	*/
	typedef struct zfs_kernel_param {
	const char name; / unused stub */
	} zfs_kernel_param_t;

	#define ZFS_MODULE_PARAM(scope_prefix, name_prefix, name, type, perm, desc)
	#define ZFS_MODULE_PARAM_ARGS void
	#define ZFS_MODULE_PARAM_CALL(scope_prefix, name_prefix, name, setfunc, \
	getfunc, perm, desc)

	/*
	* Threads.
	*/
	typedef pthread_t kthread_t;

	#define TS_RUN 0x00000002
	#define TS_JOINABLE 0x00000004

	#define curthread ((void *)(uintptr_t)pthread_self())
	#define kpreempt(x) yield()
	#define getcomm() "unknown"

	#define thread_create_named(name, stk, stksize, func, arg, len, \
	pp, state, pri) \
	zk_thread_create(func, arg, stksize, state)
	#define thread_create(stk, stksize, func, arg, len, pp, state, pri) \
	zk_thread_create(func, arg, stksize, state)
	#define thread_exit() pthread_exit(NULL)
	#define thread_join(t) pthread_join((pthread_t)(t), NULL)

	#define newproc(f, a, cid, pri, ctp, pid) (ENOSYS)

	/* in libzpool, p0 exists only to have its address taken */
	typedef struct proc {
	uintptr_t this_is_never_used_dont_dereference_it;
	} proc_t;

	extern struct proc p0;
	#define curproc (&p0)

	#define PS_NONE -1

	extern kthread_t zk_thread_create(void (func)(void ), void arg,
	size_t stksize, int state);

	#define issig(why) (FALSE)
	#define ISSIG(thr, why) (FALSE)

	#define kpreempt_disable() ((void)0)
	#define kpreempt_enable() ((void)0)
	#define cond_resched() sched_yield()

	/*
	* Mutexes
	*/
	typedef struct kmutex {
	pthread_mutex_t m_lock;
	pthread_t m_owner;
	} kmutex_t;

	#define MUTEX_DEFAULT 0
	#define MUTEX_NOLOCKDEP MUTEX_DEFAULT
	#define MUTEX_HELD(mp) pthread_equal((mp)->m_owner, pthread_self())
	#define MUTEX_NOT_HELD(mp) !MUTEX_HELD(mp)

	extern void mutex_init(kmutex_t mp, char name, int type, void *cookie);
	extern void mutex_destroy(kmutex_t *mp);
	extern void mutex_enter(kmutex_t *mp);
	extern void mutex_exit(kmutex_t *mp);
	extern int mutex_tryenter(kmutex_t *mp);

	#define NESTED_SINGLE 1
	#define mutex_enter_nested(mp, class) mutex_enter(mp)
	/*
	* RW locks
	*/
	typedef struct krwlock {
	pthread_rwlock_t rw_lock;
	pthread_t rw_owner;
	uint_t rw_readers;
	} krwlock_t;

	typedef int krw_t;

	#define RW_READER 0
	#define RW_WRITER 1
	#define RW_DEFAULT RW_READER
	#define RW_NOLOCKDEP RW_READER

	#define RW_READ_HELD(rw) ((rw)->rw_readers > 0)
	#define RW_WRITE_HELD(rw) pthread_equal((rw)->rw_owner, pthread_self())
	#define RW_LOCK_HELD(rw) (RW_READ_HELD(rw) \|\| RW_WRITE_HELD(rw))

	extern void rw_init(krwlock_t rwlp, char name, int type, void *arg);
	extern void rw_destroy(krwlock_t *rwlp);
	extern void rw_enter(krwlock_t *rwlp, krw_t rw);
	extern int rw_tryenter(krwlock_t *rwlp, krw_t rw);
	extern int rw_tryupgrade(krwlock_t *rwlp);
	extern void rw_exit(krwlock_t *rwlp);
	#define rw_downgrade(rwlp) do { } while (0)

	/*
	* Credentials
	*/
	extern uid_t crgetuid(cred_t *cr);
	extern uid_t crgetruid(cred_t *cr);
	extern gid_t crgetgid(cred_t *cr);
	extern int crgetngroups(cred_t *cr);
	extern gid_t crgetgroups(cred_t cr);

	/*
	* Condition variables
	*/
	typedef pthread_cond_t kcondvar_t;

	#define CV_DEFAULT 0
	#define CALLOUT_FLAG_ABSOLUTE 0x2

	extern void cv_init(kcondvar_t cv, char name, int type, void *arg);
	extern void cv_destroy(kcondvar_t *cv);
	extern void cv_wait(kcondvar_t cv, kmutex_t mp);
	extern int cv_wait_sig(kcondvar_t cv, kmutex_t mp);
	extern int cv_timedwait(kcondvar_t cv, kmutex_t mp, clock_t abstime);
	extern int cv_timedwait_hires(kcondvar_t cvp, kmutex_t mp, hrtime_t tim,
	hrtime_t res, int flag);
	extern void cv_signal(kcondvar_t *cv);
	extern void cv_broadcast(kcondvar_t *cv);

	#define cv_timedwait_io(cv, mp, at) cv_timedwait(cv, mp, at)
	#define cv_timedwait_idle(cv, mp, at) cv_timedwait(cv, mp, at)
	#define cv_timedwait_sig(cv, mp, at) cv_timedwait(cv, mp, at)
	#define cv_wait_io(cv, mp) cv_wait(cv, mp)
	#define cv_wait_idle(cv, mp) cv_wait(cv, mp)
	#define cv_wait_io_sig(cv, mp) cv_wait_sig(cv, mp)
	#define cv_timedwait_sig_hires(cv, mp, t, r, f) \
	cv_timedwait_hires(cv, mp, t, r, f)
	#define cv_timedwait_idle_hires(cv, mp, t, r, f) \
	cv_timedwait_hires(cv, mp, t, r, f)

	/*
	* Thread-specific data
	*/
	#define tsd_get(k) pthread_getspecific(k)
	#define tsd_set(k, v) pthread_setspecific(k, v)
	#define tsd_create(kp, d) pthread_key_create((pthread_key_t *)kp, d)
	#define tsd_destroy(kp) /* nothing */
	#ifdef __FreeBSD__
	typedef off_t loff_t;
	#endif

	/*
	* kstat creation, installation and deletion
	*/
	extern kstat_t kstat_create(const char , int,
	const char , const char , uchar_t, ulong_t, uchar_t);
	extern void kstat_install(kstat_t *);
	extern void kstat_delete(kstat_t *);
	extern void kstat_set_raw_ops(kstat_t *ksp,
	int (headers)(char buf, size_t size),
	int (data)(char buf, size_t size, void *data),
	void (addr)(kstat_t *ksp, loff_t index));

	/*
	* procfs list manipulation
	*/

	typedef struct procfs_list {
	void *pl_private;
	kmutex_t pl_lock;
	list_t pl_list;
	uint64_t pl_next_id;
	size_t pl_node_offset;
	} procfs_list_t;

	#ifndef __cplusplus
	struct seq_file { };
	void seq_printf(struct seq_file m, const char fmt, ...);

	typedef struct procfs_list_node {
	list_node_t pln_link;
	uint64_t pln_id;
	} procfs_list_node_t;

	void procfs_list_install(const char *module,
	const char *submodule,
	const char *name,
	mode_t mode,
	procfs_list_t *procfs_list,
	int (show)(struct seq_file f, void *p),
	int (show_header)(struct seq_file f),
	int (clear)(procfs_list_t procfs_list),
	size_t procfs_list_node_off);
	void procfs_list_uninstall(procfs_list_t *procfs_list);
	void procfs_list_destroy(procfs_list_t *procfs_list);
	void procfs_list_add(procfs_list_t procfs_list, void p);
	#endif

	/*
	* Kernel memory
	*/
	#define KM_SLEEP UMEM_NOFAIL
	#define KM_PUSHPAGE KM_SLEEP
	#define KM_NOSLEEP UMEM_DEFAULT
	#define KM_NORMALPRI 0 /* not needed with UMEM_DEFAULT */
	#define KMC_NODEBUG UMC_NODEBUG
	#define KMC_KVMEM 0x0
	#define kmem_alloc(_s, _f) umem_alloc(_s, _f)
	#define kmem_zalloc(_s, _f) umem_zalloc(_s, _f)
	#define kmem_free(_b, _s) umem_free(_b, _s)
	#define vmem_alloc(_s, _f) kmem_alloc(_s, _f)
	#define vmem_zalloc(_s, _f) kmem_zalloc(_s, _f)
	#define vmem_free(_b, _s) kmem_free(_b, _s)
	#define kmem_cache_create(_a, _b, _c, _d, _e, _f, _g, _h, _i) \
	umem_cache_create(_a, _b, _c, _d, _e, _f, _g, _h, _i)
	#define kmem_cache_destroy(_c) umem_cache_destroy(_c)
	#define kmem_cache_alloc(_c, _f) umem_cache_alloc(_c, _f)
	#define kmem_cache_free(_c, _b) umem_cache_free(_c, _b)
	#define kmem_debugging() 0
	#define kmem_cache_reap_now(_c) umem_cache_reap_now(_c);
	#define kmem_cache_set_move(_c, _cb) /* nothing */
	#define POINTER_INVALIDATE(_pp) /* nothing */
	#define POINTER_IS_VALID(_p) 0

	typedef umem_cache_t kmem_cache_t;

	typedef enum kmem_cbrc {
	KMEM_CBRC_YES,
	KMEM_CBRC_NO,
	KMEM_CBRC_LATER,
	KMEM_CBRC_DONT_NEED,
	KMEM_CBRC_DONT_KNOW
	} kmem_cbrc_t;

	/*
	* Task queues
	*/

	#define TASKQ_NAMELEN 31

	typedef uintptr_t taskqid_t;
	typedef void (task_func_t)(void *);

	typedef struct taskq_ent {
	struct taskq_ent *tqent_next;
	struct taskq_ent *tqent_prev;
	task_func_t *tqent_func;
	void *tqent_arg;
	uintptr_t tqent_flags;
	} taskq_ent_t;

	typedef struct taskq {
	char tq_name[TASKQ_NAMELEN + 1];
	kmutex_t tq_lock;
	krwlock_t tq_threadlock;
	kcondvar_t tq_dispatch_cv;
	kcondvar_t tq_wait_cv;
	kthread_t **tq_threadlist;
	int tq_flags;
	int tq_active;
	int tq_nthreads;
	int tq_nalloc;
	int tq_minalloc;
	int tq_maxalloc;
	kcondvar_t tq_maxalloc_cv;
	int tq_maxalloc_wait;
	taskq_ent_t *tq_freelist;
	taskq_ent_t tq_task;
	} taskq_t;

	#define TQENT_FLAG_PREALLOC 0x1 /* taskq_dispatch_ent used */

	#define TASKQ_PREPOPULATE 0x0001
	#define TASKQ_CPR_SAFE 0x0002 /* Use CPR safe protocol */
	#define TASKQ_DYNAMIC 0x0004 /* Use dynamic thread scheduling */
	#define TASKQ_THREADS_CPU_PCT 0x0008 /* Scale # threads by # cpus */
	#define TASKQ_DC_BATCH 0x0010 /* Mark threads as batch */

	#define TQ_SLEEP KM_SLEEP /* Can block for memory */
	#define TQ_NOSLEEP KM_NOSLEEP /* cannot block for memory; may fail */
	#define TQ_NOQUEUE 0x02 /* Do not enqueue if can't dispatch */
	#define TQ_FRONT 0x08 /* Queue in front */

	#define TASKQID_INVALID ((taskqid_t)0)

	extern taskq_t *system_taskq;
	extern taskq_t *system_delay_taskq;

	extern taskq_t taskq_create(const char , int, pri_t, int, int, uint_t);
	#define taskq_create_proc(a, b, c, d, e, p, f) \
	(taskq_create(a, b, c, d, e, f))
	#define taskq_create_sysdc(a, b, d, e, p, dc, f) \
	(taskq_create(a, b, maxclsyspri, d, e, f))
	extern taskqid_t taskq_dispatch(taskq_t , task_func_t, void , uint_t);
	extern taskqid_t taskq_dispatch_delay(taskq_t , task_func_t, void , uint_t,
	clock_t);
	extern void taskq_dispatch_ent(taskq_t , task_func_t, void , uint_t,
	taskq_ent_t *);
	extern int taskq_empty_ent(taskq_ent_t *);
	extern void taskq_init_ent(taskq_ent_t *);
	extern void taskq_destroy(taskq_t *);
	extern void taskq_wait(taskq_t *);
	extern void taskq_wait_id(taskq_t *, taskqid_t);
	extern void taskq_wait_outstanding(taskq_t *, taskqid_t);
	extern int taskq_member(taskq_t , kthread_t );
	extern taskq_t *taskq_of_curthread(void);
	extern int taskq_cancel_id(taskq_t *, taskqid_t);
	extern void system_taskq_init(void);
	extern void system_taskq_fini(void);

	#define XVA_MAPSIZE 3
	#define XVA_MAGIC 0x78766174

	extern char *vn_dumpdir;
	#define AV_SCANSTAMP_SZ 32 /* length of anti-virus scanstamp */

	typedef struct xoptattr {
	inode_timespec_t xoa_createtime; /* Create time of file */
	uint8_t xoa_archive;
	uint8_t xoa_system;
	uint8_t xoa_readonly;
	uint8_t xoa_hidden;
	uint8_t xoa_nounlink;
	uint8_t xoa_immutable;
	uint8_t xoa_appendonly;
	uint8_t xoa_nodump;
	uint8_t xoa_settable;
	uint8_t xoa_opaque;
	uint8_t xoa_av_quarantined;
	uint8_t xoa_av_modified;
	uint8_t xoa_av_scanstamp[AV_SCANSTAMP_SZ];
	uint8_t xoa_reparse;
	uint8_t xoa_offline;
	uint8_t xoa_sparse;
	} xoptattr_t;

	typedef struct vattr {
	uint_t va_mask; /* bit-mask of attributes */
	u_offset_t va_size; /* file size in bytes */
	} vattr_t;


	typedef struct xvattr {
	vattr_t xva_vattr; /* Embedded vattr structure */
	uint32_t xva_magic; /* Magic Number */
	uint32_t xva_mapsize; /* Size of attr bitmap (32-bit words) */
	uint32_t xva_rtnattrmapp; / Ptr to xva_rtnattrmap[] */
	uint32_t xva_reqattrmap[XVA_MAPSIZE]; /* Requested attrs */
	uint32_t xva_rtnattrmap[XVA_MAPSIZE]; /* Returned attrs */
	xoptattr_t xva_xoptattrs; /* Optional attributes */
	} xvattr_t;

	typedef struct vsecattr {
	uint_t vsa_mask; /* See below */
	int vsa_aclcnt; /* ACL entry count */
	void vsa_aclentp; / pointer to ACL entries */
	int vsa_dfaclcnt; /* default ACL entry count */
	void vsa_dfaclentp; / pointer to default ACL entries */
	size_t vsa_aclentsz; /* ACE size in bytes of vsa_aclentp */
	} vsecattr_t;

	#define AT_MODE 0x00002
	#define AT_UID 0x00004
	#define AT_GID 0x00008
	#define AT_FSID 0x00010
	#define AT_NODEID 0x00020
	#define AT_NLINK 0x00040
	#define AT_SIZE 0x00080
	#define AT_ATIME 0x00100
	#define AT_MTIME 0x00200
	#define AT_CTIME 0x00400
	#define AT_RDEV 0x00800
	#define AT_BLKSIZE 0x01000
	#define AT_NBLOCKS 0x02000
	#define AT_SEQ 0x08000
	#define AT_XVATTR 0x10000

	#define CRCREAT 0

	#define F_FREESP 11
	#define FIGNORECASE 0x80000 /* request case-insensitive lookups */

	/*
	* Random stuff
	*/
	#define ddi_get_lbolt() (gethrtime() >> 23)
	#define ddi_get_lbolt64() (gethrtime() >> 23)
	#define hz 119 /* frequency when using gethrtime() >> 23 for lbolt */

	#define ddi_time_before(a, b) (a < b)
	#define ddi_time_after(a, b) ddi_time_before(b, a)
	#define ddi_time_before_eq(a, b) (!ddi_time_after(a, b))
	#define ddi_time_after_eq(a, b) ddi_time_before_eq(b, a)

	#define ddi_time_before64(a, b) (a < b)
	#define ddi_time_after64(a, b) ddi_time_before64(b, a)
	#define ddi_time_before_eq64(a, b) (!ddi_time_after64(a, b))
	#define ddi_time_after_eq64(a, b) ddi_time_before_eq64(b, a)

	extern void delay(clock_t ticks);

	#define SEC_TO_TICK(sec) ((sec) * hz)
	#define MSEC_TO_TICK(msec) (howmany((hrtime_t)(msec) * hz, MILLISEC))
	#define USEC_TO_TICK(usec) (howmany((hrtime_t)(usec) * hz, MICROSEC))
	#define NSEC_TO_TICK(nsec) (howmany((hrtime_t)(nsec) * hz, NANOSEC))

	#define max_ncpus 64
	#define boot_ncpus (sysconf(_SC_NPROCESSORS_ONLN))

	/*
	* Process priorities as defined by setpriority(2) and getpriority(2).
	*/
	#define minclsyspri 19
	#define maxclsyspri -20
	#define defclsyspri 0

	#define CPU_SEQID ((uintptr_t)pthread_self() & (max_ncpus - 1))
	#define CPU_SEQID_UNSTABLE CPU_SEQID

	#define kcred NULL
	#define CRED() NULL

	#define ptob(x) ((x) * PAGESIZE)

	#define NN_DIVISOR_1000 (1U << 0)
	#define NN_NUMBUF_SZ (6)

	extern uint64_t physmem;
	extern const char *random_path;
	extern const char *urandom_path;

	extern int highbit64(uint64_t i);
	extern int lowbit64(uint64_t i);
	extern int random_get_bytes(uint8_t *ptr, size_t len);
	extern int random_get_pseudo_bytes(uint8_t *ptr, size_t len);

	+static __inline__ uint32_t
	+random_in_range(uint32_t range)
	+{
	+ uint32_t r;
	+
	+ ASSERT(range != 0);
	+
	+ if (range == 1)
	+ return (0);
	+
	+ (void) random_get_pseudo_bytes((uint8_t *)&r, sizeof (r));
	+
	+ return (r % range);
	+}
	+
	extern void kernel_init(int mode);
	extern void kernel_fini(void);
	extern void random_init(void);
	extern void random_fini(void);

	struct spa;
	extern void show_pool_stats(struct spa *);
	extern int set_global_var(char const *arg);

	typedef struct callb_cpr {
	kmutex_t *cc_lockp;
	} callb_cpr_t;

	#define CALLB_CPR_INIT(cp, lockp, func, name) { \
	(cp)->cc_lockp = lockp; \
	}

	#define CALLB_CPR_SAFE_BEGIN(cp) { \
	ASSERT(MUTEX_HELD((cp)->cc_lockp)); \
	}

	#define CALLB_CPR_SAFE_END(cp, lockp) { \
	ASSERT(MUTEX_HELD((cp)->cc_lockp)); \
	}

	#define CALLB_CPR_EXIT(cp) { \
	ASSERT(MUTEX_HELD((cp)->cc_lockp)); \
	mutex_exit((cp)->cc_lockp); \
	}

	#define zone_dataset_visible(x, y) (1)
	#define INGLOBALZONE(z) (1)
	extern uint32_t zone_get_hostid(void *zonep);

	extern char kmem_vasprintf(const char fmt, va_list adx);
	extern char kmem_asprintf(const char fmt, ...);
	#define kmem_strfree(str) kmem_free((str), strlen(str) + 1)
	#define kmem_strdup(s) strdup(s)

	/*
	* Hostname information
	*/
	extern char hw_serial[]; /* for userland-emulated hostid access */
	extern int ddi_strtoul(const char str, char *nptr, int base,
	unsigned long *result);

	extern int ddi_strtoull(const char str, char *nptr, int base,
	u_longlong_t *result);

	typedef struct utsname utsname_t;
	extern utsname_t *utsname(void);

	/* ZFS Boot Related stuff. */

	struct _buf {
	intptr_t _fd;
	};

	struct bootstat {
	uint64_t st_size;
	};

	typedef struct ace_object {
	uid_t a_who;
	uint32_t a_access_mask;
	uint16_t a_flags;
	uint16_t a_type;
	uint8_t a_obj_type[16];
	uint8_t a_inherit_obj_type[16];
	} ace_object_t;


	#define ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE 0x05
	#define ACE_ACCESS_DENIED_OBJECT_ACE_TYPE 0x06
	#define ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE 0x07
	#define ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE 0x08

	extern int zfs_secpolicy_snapshot_perms(const char name, cred_t cr);
	extern int zfs_secpolicy_rename_perms(const char from, const char to,
	cred_t *cr);
	extern int zfs_secpolicy_destroy_perms(const char name, cred_t cr);
	extern int secpolicy_zfs(const cred_t *cr);
	extern int secpolicy_zfs_proc(const cred_t cr, proc_t proc);
	extern zoneid_t getzoneid(void);

	/* SID stuff */
	typedef struct ksiddomain {
	uint_t kd_ref;
	uint_t kd_len;
	char *kd_name;
	} ksiddomain_t;

	ksiddomain_t ksid_lookupdomain(const char );
	void ksiddomain_rele(ksiddomain_t *);

	#define DDI_SLEEP KM_SLEEP
	#define ddi_log_sysevent(_a, _b, _c, _d, _e, _f, _g) \
	sysevent_post_event(_c, _d, _b, "libzpool", _e, _f)

	#define zfs_sleep_until(wakeup) \
	do { \
	hrtime_t delta = wakeup - gethrtime(); \
	struct timespec ts; \
	ts.tv_sec = delta / NANOSEC; \
	ts.tv_nsec = delta % NANOSEC; \
	(void) nanosleep(&ts, NULL); \
	} while (0)

	typedef int fstrans_cookie_t;

	extern fstrans_cookie_t spl_fstrans_mark(void);
	extern void spl_fstrans_unmark(fstrans_cookie_t);
	extern int __spl_pf_fstrans_check(void);
	extern int kmem_cache_reap_active(void);

	#define ____cacheline_aligned

	/*
	* Kernel modules
	*/
	#define __init
	#define __exit

	#endif /* _KERNEL \|\| _STANDALONE */

	#ifdef __cplusplus
	};
	#endif

	#endif /* _SYS_ZFS_CONTEXT_H */
	diff --git a/sys/contrib/openzfs/include/sys/zfs_file.h b/sys/contrib/openzfs/include/sys/zfs_file.h
	index d117933a6e4c..02cd1a6f041a 100644
	--- a/sys/contrib/openzfs/include/sys/zfs_file.h
	+++ b/sys/contrib/openzfs/include/sys/zfs_file.h
	@@ -1,62 +1,64 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	#ifndef _SYS_ZFS_FILE_H
	#define _SYS_ZFS_FILE_H

	+#include <sys/zfs_context.h>
	+
	#ifndef _KERNEL
	typedef struct zfs_file {
	int f_fd;
	int f_dump_fd;
	} zfs_file_t;
	#elif defined(__linux__) \|\| defined(__FreeBSD__)
	typedef struct file zfs_file_t;
	#else
	#error "unknown OS"
	#endif

	typedef struct zfs_file_attr {
	uint64_t zfa_size; /* file size */
	mode_t zfa_mode; /* file type */
	} zfs_file_attr_t;

	int zfs_file_open(const char path, int flags, int mode, zfs_file_t *fp);
	void zfs_file_close(zfs_file_t *fp);

	int zfs_file_write(zfs_file_t fp, const void buf, size_t len, ssize_t *resid);
	int zfs_file_pwrite(zfs_file_t fp, const void buf, size_t len, loff_t off,
	ssize_t *resid);
	int zfs_file_read(zfs_file_t fp, void buf, size_t len, ssize_t *resid);
	int zfs_file_pread(zfs_file_t fp, void buf, size_t len, loff_t off,
	ssize_t *resid);

	int zfs_file_seek(zfs_file_t fp, loff_t offp, int whence);
	int zfs_file_getattr(zfs_file_t fp, zfs_file_attr_t zfattr);
	int zfs_file_fsync(zfs_file_t *fp, int flags);
	int zfs_file_fallocate(zfs_file_t *fp, int mode, loff_t offset, loff_t len);
	loff_t zfs_file_off(zfs_file_t *fp);
	int zfs_file_unlink(const char *);

	-int zfs_file_get(int fd, zfs_file_t **fp);
	-void zfs_file_put(int fd);
	+zfs_file_t *zfs_file_get(int fd);
	+void zfs_file_put(zfs_file_t *fp);
	void zfs_file_private(zfs_file_t fp);

	#endif /* _SYS_ZFS_FILE_H */
	diff --git a/sys/contrib/openzfs/include/sys/zfs_ioctl.h b/sys/contrib/openzfs/include/sys/zfs_ioctl.h
	index 8834c52990d0..1ca3f211b56d 100644
	--- a/sys/contrib/openzfs/include/sys/zfs_ioctl.h
	+++ b/sys/contrib/openzfs/include/sys/zfs_ioctl.h
	@@ -1,581 +1,581 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2020 by Delphix. All rights reserved.
	* Copyright 2016 RackTop Systems.
	* Copyright (c) 2017, Intel Corporation.
	*/

	#ifndef _SYS_ZFS_IOCTL_H
	#define _SYS_ZFS_IOCTL_H

	#include <sys/cred.h>
	#include <sys/dmu.h>
	#include <sys/zio.h>
	#include <sys/dsl_deleg.h>
	#include <sys/spa.h>
	#include <sys/zfs_stat.h>

	#ifdef _KERNEL
	#include <sys/nvpair.h>
	#endif /* _KERNEL */

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* The structures in this file are passed between userland and the
	* kernel. Userland may be running a 32-bit process, while the kernel
	* is 64-bit. Therefore, these structures need to compile the same in
	* 32-bit and 64-bit. This means not using type "long", and adding
	* explicit padding so that the 32-bit structure will not be packed more
	* tightly than the 64-bit structure (which requires 64-bit alignment).
	*/

	/*
	* Property values for snapdir
	*/
	#define ZFS_SNAPDIR_HIDDEN 0
	#define ZFS_SNAPDIR_VISIBLE 1

	/*
	* Property values for snapdev
	*/
	#define ZFS_SNAPDEV_HIDDEN 0
	#define ZFS_SNAPDEV_VISIBLE 1
	/*
	* Property values for acltype
	*/
	#define ZFS_ACLTYPE_OFF 0
	#define ZFS_ACLTYPE_POSIX 1
	#define ZFS_ACLTYPE_NFSV4 2

	/*
	* Field manipulation macros for the drr_versioninfo field of the
	* send stream header.
	*/

	/*
	* Header types for zfs send streams.
	*/
	typedef enum drr_headertype {
	DMU_SUBSTREAM = 0x1,
	DMU_COMPOUNDSTREAM = 0x2
	} drr_headertype_t;

	#define DMU_GET_STREAM_HDRTYPE(vi) BF64_GET((vi), 0, 2)
	#define DMU_SET_STREAM_HDRTYPE(vi, x) BF64_SET((vi), 0, 2, x)

	#define DMU_GET_FEATUREFLAGS(vi) BF64_GET((vi), 2, 30)
	#define DMU_SET_FEATUREFLAGS(vi, x) BF64_SET((vi), 2, 30, x)

	/*
	* Feature flags for zfs send streams (flags in drr_versioninfo)
	*/

	#define DMU_BACKUP_FEATURE_DEDUP (1 << 0)
	#define DMU_BACKUP_FEATURE_DEDUPPROPS (1 << 1)
	#define DMU_BACKUP_FEATURE_SA_SPILL (1 << 2)
	/* flags #3 - #15 are reserved for incompatible closed-source implementations */
	#define DMU_BACKUP_FEATURE_EMBED_DATA (1 << 16)
	#define DMU_BACKUP_FEATURE_LZ4 (1 << 17)
	/* flag #18 is reserved for a Delphix feature */
	#define DMU_BACKUP_FEATURE_LARGE_BLOCKS (1 << 19)
	#define DMU_BACKUP_FEATURE_RESUMING (1 << 20)
	#define DMU_BACKUP_FEATURE_REDACTED (1 << 21)
	#define DMU_BACKUP_FEATURE_COMPRESSED (1 << 22)
	#define DMU_BACKUP_FEATURE_LARGE_DNODE (1 << 23)
	#define DMU_BACKUP_FEATURE_RAW (1 << 24)
	#define DMU_BACKUP_FEATURE_ZSTD (1 << 25)
	#define DMU_BACKUP_FEATURE_HOLDS (1 << 26)
	/*
	* The SWITCH_TO_LARGE_BLOCKS feature indicates that we can receive
	* incremental LARGE_BLOCKS streams (those with WRITE records of >128KB) even
	* if the previous send did not use LARGE_BLOCKS, and thus its large blocks
	* were split into multiple 128KB WRITE records. (See
	* flush_write_batch_impl() and receive_object()). Older software that does
	* not support this flag may encounter a bug when switching to large blocks,
	* which causes files to incorrectly be zeroed.
	*
	* This flag is currently not set on any send streams. In the future, we
	* intend for incremental send streams of snapshots that have large blocks to
	* use LARGE_BLOCKS by default, and these streams will also have the
	* SWITCH_TO_LARGE_BLOCKS feature set. This ensures that streams from the
	* default use of "zfs send" won't encounter the bug mentioned above.
	*/
	#define DMU_BACKUP_FEATURE_SWITCH_TO_LARGE_BLOCKS (1 << 27)

	/*
	* Mask of all supported backup features
	*/
	#define DMU_BACKUP_FEATURE_MASK (DMU_BACKUP_FEATURE_SA_SPILL \| \
	DMU_BACKUP_FEATURE_EMBED_DATA \| DMU_BACKUP_FEATURE_LZ4 \| \
	DMU_BACKUP_FEATURE_RESUMING \| DMU_BACKUP_FEATURE_LARGE_BLOCKS \| \
	DMU_BACKUP_FEATURE_COMPRESSED \| DMU_BACKUP_FEATURE_LARGE_DNODE \| \
	DMU_BACKUP_FEATURE_RAW \| DMU_BACKUP_FEATURE_HOLDS \| \
	DMU_BACKUP_FEATURE_REDACTED \| DMU_BACKUP_FEATURE_SWITCH_TO_LARGE_BLOCKS \| \
	DMU_BACKUP_FEATURE_ZSTD)

	/* Are all features in the given flag word currently supported? */
	#define DMU_STREAM_SUPPORTED(x) (!((x) & ~DMU_BACKUP_FEATURE_MASK))

	typedef enum dmu_send_resume_token_version {
	ZFS_SEND_RESUME_TOKEN_VERSION = 1
	} dmu_send_resume_token_version_t;

	/*
	* The drr_versioninfo field of the dmu_replay_record has the
	* following layout:
	*
	* 64 56 48 40 32 24 16 8 0
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	* \| reserved \| feature-flags \|C\|S\|
	* +-------+-------+-------+-------+-------+-------+-------+-------+
	*
	* The low order two bits indicate the header type: SUBSTREAM (0x1)
	* or COMPOUNDSTREAM (0x2). Using two bits for this is historical:
	* this field used to be a version number, where the two version types
	* were 1 and 2. Using two bits for this allows earlier versions of
	* the code to be able to recognize send streams that don't use any
	* of the features indicated by feature flags.
	*/

	#define DMU_BACKUP_MAGIC 0x2F5bacbacULL

	/*
	* Send stream flags. Bits 24-31 are reserved for vendor-specific
	* implementations and should not be used.
	*/
	#define DRR_FLAG_CLONE (1<<0)
	#define DRR_FLAG_CI_DATA (1<<1)
	/*
	* This send stream, if it is a full send, includes the FREE and FREEOBJECT
	* records that are created by the sending process. This means that the send
	* stream can be received as a clone, even though it is not an incremental.
	* This is not implemented as a feature flag, because the receiving side does
	* not need to have implemented it to receive this stream; it is fully backwards
	* compatible. We need a flag, though, because full send streams without it
	* cannot necessarily be received as a clone correctly.
	*/
	#define DRR_FLAG_FREERECORDS (1<<2)
	/*
	* When DRR_FLAG_SPILL_BLOCK is set it indicates the DRR_OBJECT_SPILL
	* and DRR_SPILL_UNMODIFIED flags are meaningful in the send stream.
	*
	* When DRR_FLAG_SPILL_BLOCK is set, DRR_OBJECT records will have
	* DRR_OBJECT_SPILL set if and only if they should have a spill block
	* (either an existing one, or a new one in the send stream). When clear
	* the object does not have a spill block and any existing spill block
	* should be freed.
	*
	* Similarly, when DRR_FLAG_SPILL_BLOCK is set, DRR_SPILL records will
	* have DRR_SPILL_UNMODIFIED set if and only if they were included for
	* backward compatibility purposes, and can be safely ignored by new versions
	* of zfs receive. Previous versions of ZFS which do not understand the
	* DRR_FLAG_SPILL_BLOCK will process this record and recreate any missing
	* spill blocks.
	*/
	#define DRR_FLAG_SPILL_BLOCK (1<<3)

	/*
	* flags in the drr_flags field in the DRR_WRITE, DRR_SPILL, DRR_OBJECT,
	* DRR_WRITE_BYREF, and DRR_OBJECT_RANGE blocks
	*/
	#define DRR_CHECKSUM_DEDUP (1<<0) /* not used for SPILL records */
	#define DRR_RAW_BYTESWAP (1<<1)
	#define DRR_OBJECT_SPILL (1<<2) /* OBJECT record has a spill block */
	#define DRR_SPILL_UNMODIFIED (1<<2) /* SPILL record for unmodified block */

	#define DRR_IS_DEDUP_CAPABLE(flags) ((flags) & DRR_CHECKSUM_DEDUP)
	#define DRR_IS_RAW_BYTESWAPPED(flags) ((flags) & DRR_RAW_BYTESWAP)
	#define DRR_OBJECT_HAS_SPILL(flags) ((flags) & DRR_OBJECT_SPILL)
	#define DRR_SPILL_IS_UNMODIFIED(flags) ((flags) & DRR_SPILL_UNMODIFIED)

	/* deal with compressed drr_write replay records */
	#define DRR_WRITE_COMPRESSED(drrw) ((drrw)->drr_compressiontype != 0)
	#define DRR_WRITE_PAYLOAD_SIZE(drrw) \
	(DRR_WRITE_COMPRESSED(drrw) ? (drrw)->drr_compressed_size : \
	(drrw)->drr_logical_size)
	#define DRR_SPILL_PAYLOAD_SIZE(drrs) \
	((drrs)->drr_compressed_size ? \
	(drrs)->drr_compressed_size : (drrs)->drr_length)
	#define DRR_OBJECT_PAYLOAD_SIZE(drro) \
	((drro)->drr_raw_bonuslen != 0 ? \
	(drro)->drr_raw_bonuslen : P2ROUNDUP((drro)->drr_bonuslen, 8))

	/*
	* zfs ioctl command structure
	*/

	/* Header is used in C++ so can't forward declare untagged struct */
	struct drr_begin {
	uint64_t drr_magic;
	uint64_t drr_versioninfo; /* was drr_version */
	uint64_t drr_creation_time;
	dmu_objset_type_t drr_type;
	uint32_t drr_flags;
	uint64_t drr_toguid;
	uint64_t drr_fromguid;
	char drr_toname[MAXNAMELEN];
	};

	typedef struct dmu_replay_record {
	enum {
	DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS,
	DRR_WRITE, DRR_FREE, DRR_END, DRR_WRITE_BYREF,
	DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_OBJECT_RANGE, DRR_REDACT,
	DRR_NUMTYPES
	} drr_type;
	uint32_t drr_payloadlen;
	union {
	struct drr_begin drr_begin;
	struct drr_end {
	zio_cksum_t drr_checksum;
	uint64_t drr_toguid;
	} drr_end;
	struct drr_object {
	uint64_t drr_object;
	dmu_object_type_t drr_type;
	dmu_object_type_t drr_bonustype;
	uint32_t drr_blksz;
	uint32_t drr_bonuslen;
	uint8_t drr_checksumtype;
	uint8_t drr_compress;
	uint8_t drr_dn_slots;
	uint8_t drr_flags;
	uint32_t drr_raw_bonuslen;
	uint64_t drr_toguid;
	/* only (possibly) nonzero for raw streams */
	uint8_t drr_indblkshift;
	uint8_t drr_nlevels;
	uint8_t drr_nblkptr;
	uint8_t drr_pad[5];
	uint64_t drr_maxblkid;
	/* bonus content follows */
	} drr_object;
	struct drr_freeobjects {
	uint64_t drr_firstobj;
	uint64_t drr_numobjs;
	uint64_t drr_toguid;
	} drr_freeobjects;
	struct drr_write {
	uint64_t drr_object;
	dmu_object_type_t drr_type;
	uint32_t drr_pad;
	uint64_t drr_offset;
	uint64_t drr_logical_size;
	uint64_t drr_toguid;
	uint8_t drr_checksumtype;
	uint8_t drr_flags;
	uint8_t drr_compressiontype;
	uint8_t drr_pad2[5];
	/* deduplication key */
	ddt_key_t drr_key;
	/* only nonzero if drr_compressiontype is not 0 */
	uint64_t drr_compressed_size;
	/* only nonzero for raw streams */
	uint8_t drr_salt[ZIO_DATA_SALT_LEN];
	uint8_t drr_iv[ZIO_DATA_IV_LEN];
	uint8_t drr_mac[ZIO_DATA_MAC_LEN];
	/* content follows */
	} drr_write;
	struct drr_free {
	uint64_t drr_object;
	uint64_t drr_offset;
	uint64_t drr_length;
	uint64_t drr_toguid;
	} drr_free;
	struct drr_write_byref {
	/* where to put the data */
	uint64_t drr_object;
	uint64_t drr_offset;
	uint64_t drr_length;
	uint64_t drr_toguid;
	/* where to find the prior copy of the data */
	uint64_t drr_refguid;
	uint64_t drr_refobject;
	uint64_t drr_refoffset;
	/* properties of the data */
	uint8_t drr_checksumtype;
	uint8_t drr_flags;
	uint8_t drr_pad2[6];
	ddt_key_t drr_key; /* deduplication key */
	} drr_write_byref;
	struct drr_spill {
	uint64_t drr_object;
	uint64_t drr_length;
	uint64_t drr_toguid;
	uint8_t drr_flags;
	uint8_t drr_compressiontype;
	uint8_t drr_pad[6];
	/* only nonzero for raw streams */
	uint64_t drr_compressed_size;
	uint8_t drr_salt[ZIO_DATA_SALT_LEN];
	uint8_t drr_iv[ZIO_DATA_IV_LEN];
	uint8_t drr_mac[ZIO_DATA_MAC_LEN];
	dmu_object_type_t drr_type;
	/* spill data follows */
	} drr_spill;
	struct drr_write_embedded {
	uint64_t drr_object;
	uint64_t drr_offset;
	/* logical length, should equal blocksize */
	uint64_t drr_length;
	uint64_t drr_toguid;
	uint8_t drr_compression;
	uint8_t drr_etype;
	uint8_t drr_pad[6];
	uint32_t drr_lsize; /* uncompressed size of payload */
	uint32_t drr_psize; /* compr. (real) size of payload */
	/* (possibly compressed) content follows */
	} drr_write_embedded;
	struct drr_object_range {
	uint64_t drr_firstobj;
	uint64_t drr_numslots;
	uint64_t drr_toguid;
	uint8_t drr_salt[ZIO_DATA_SALT_LEN];
	uint8_t drr_iv[ZIO_DATA_IV_LEN];
	uint8_t drr_mac[ZIO_DATA_MAC_LEN];
	uint8_t drr_flags;
	uint8_t drr_pad[3];
	} drr_object_range;
	struct drr_redact {
	uint64_t drr_object;
	uint64_t drr_offset;
	uint64_t drr_length;
	uint64_t drr_toguid;
	} drr_redact;

	/*
	* Note: drr_checksum is overlaid with all record types
	* except DRR_BEGIN. Therefore its (non-pad) members
	* must not overlap with members from the other structs.
	* We accomplish this by putting its members at the very
	* end of the struct.
	*/
	struct drr_checksum {
	uint64_t drr_pad[34];
	/*
	* fletcher-4 checksum of everything preceding the
	* checksum.
	*/
	zio_cksum_t drr_checksum;
	} drr_checksum;
	} drr_u;
	} dmu_replay_record_t;

	/* diff record range types */
	typedef enum diff_type {
	DDR_NONE = 0x1,
	DDR_INUSE = 0x2,
	DDR_FREE = 0x4
	} diff_type_t;

	/*
	* The diff reports back ranges of free or in-use objects.
	*/
	typedef struct dmu_diff_record {
	uint64_t ddr_type;
	uint64_t ddr_first;
	uint64_t ddr_last;
	} dmu_diff_record_t;

	typedef struct zinject_record {
	uint64_t zi_objset;
	uint64_t zi_object;
	uint64_t zi_start;
	uint64_t zi_end;
	uint64_t zi_guid;
	uint32_t zi_level;
	uint32_t zi_error;
	uint64_t zi_type;
	uint32_t zi_freq;
	uint32_t zi_failfast;
	char zi_func[MAXNAMELEN];
	uint32_t zi_iotype;
	int32_t zi_duration;
	uint64_t zi_timer;
	uint64_t zi_nlanes;
	uint32_t zi_cmd;
	uint32_t zi_dvas;
	} zinject_record_t;

	#define ZINJECT_NULL 0x1
	#define ZINJECT_FLUSH_ARC 0x2
	#define ZINJECT_UNLOAD_SPA 0x4
	#define ZINJECT_CALC_RANGE 0x8

	#define ZEVENT_NONE 0x0
	#define ZEVENT_NONBLOCK 0x1
	#define ZEVENT_SIZE 1024

	#define ZEVENT_SEEK_START 0
	#define ZEVENT_SEEK_END UINT64_MAX

	/* scaled frequency ranges */
	#define ZI_PERCENTAGE_MIN 4294UL
	#define ZI_PERCENTAGE_MAX UINT32_MAX

	#define ZI_NO_DVA (-1)

	typedef enum zinject_type {
	ZINJECT_UNINITIALIZED,
	ZINJECT_DATA_FAULT,
	ZINJECT_DEVICE_FAULT,
	ZINJECT_LABEL_FAULT,
	ZINJECT_IGNORED_WRITES,
	ZINJECT_PANIC,
	ZINJECT_DELAY_IO,
	ZINJECT_DECRYPT_FAULT,
	} zinject_type_t;

	typedef struct zfs_share {
	uint64_t z_exportdata;
	uint64_t z_sharedata;
	uint64_t z_sharetype; /* 0 = share, 1 = unshare */
	uint64_t z_sharemax; /* max length of share string */
	} zfs_share_t;

	/*
	* ZFS file systems may behave the usual, POSIX-compliant way, where
	* name lookups are case-sensitive. They may also be set up so that
	* all the name lookups are case-insensitive, or so that only some
	* lookups, the ones that set an FIGNORECASE flag, are case-insensitive.
	*/
	typedef enum zfs_case {
	ZFS_CASE_SENSITIVE,
	ZFS_CASE_INSENSITIVE,
	ZFS_CASE_MIXED
	} zfs_case_t;

	/*
	* Note: this struct must have the same layout in 32-bit and 64-bit, so
	* that 32-bit processes (like /sbin/zfs) can pass it to the 64-bit
	* kernel. Therefore, we add padding to it so that no "hidden" padding
	* is automatically added on 64-bit (but not on 32-bit).
	*/
	typedef struct zfs_cmd {
	char zc_name[MAXPATHLEN]; /* name of pool or dataset */
	uint64_t zc_nvlist_src; /* really (char ) /
	uint64_t zc_nvlist_src_size;
	uint64_t zc_nvlist_dst; /* really (char ) /
	uint64_t zc_nvlist_dst_size;
	boolean_t zc_nvlist_dst_filled; /* put an nvlist in dst? */
	int zc_pad2;

	/*
	* The following members are for legacy ioctls which haven't been
	* converted to the new method.
	*/
	uint64_t zc_history; /* really (char ) /
	char zc_value[MAXPATHLEN * 2];
	char zc_string[MAXNAMELEN];
	uint64_t zc_guid;
	uint64_t zc_nvlist_conf; /* really (char ) /
	uint64_t zc_nvlist_conf_size;
	uint64_t zc_cookie;
	uint64_t zc_objset_type;
	uint64_t zc_perm_action;
	uint64_t zc_history_len;
	uint64_t zc_history_offset;
	uint64_t zc_obj;
	uint64_t zc_iflags; /* internal to zfs(7fs) */
	zfs_share_t zc_share;
	dmu_objset_stats_t zc_objset_stats;
	struct drr_begin zc_begin_record;
	zinject_record_t zc_inject_record;
	uint32_t zc_defer_destroy;
	uint32_t zc_flags;
	uint64_t zc_action_handle;
	int zc_cleanup_fd;
	uint8_t zc_simple;
	uint8_t zc_pad[3]; /* alignment */
	uint64_t zc_sendobj;
	uint64_t zc_fromobj;
	uint64_t zc_createtxg;
	zfs_stat_t zc_stat;
	uint64_t zc_zoneid;
	} zfs_cmd_t;

	typedef struct zfs_useracct {
	char zu_domain[256];
	uid_t zu_rid;
	uint32_t zu_pad;
	uint64_t zu_space;
	} zfs_useracct_t;

	#define ZFSDEV_MAX_MINOR (1 << 16)

	#define ZPOOL_EXPORT_AFTER_SPLIT 0x1

	#ifdef _KERNEL
	struct objset;
	struct zfsvfs;

	typedef struct zfs_creat {
	nvlist_t *zct_zplprops;
	nvlist_t *zct_props;
	} zfs_creat_t;

	extern int zfs_secpolicy_snapshot_perms(const char , cred_t );
	extern int zfs_secpolicy_rename_perms(const char , const char , cred_t *);
	extern int zfs_secpolicy_destroy_perms(const char , cred_t );
	extern void zfs_unmount_snap(const char *);
	extern void zfs_destroy_unmount_origin(const char *);
	extern int getzfsvfs_impl(struct objset , struct zfsvfs *);
	extern int getzfsvfs(const char , struct zfsvfs *);

	enum zfsdev_state_type {
	ZST_ONEXIT,
	ZST_ZEVENT,
	ZST_ALL,
	};

	/*
	* The zfsdev_state_t structure is managed as a singly-linked list
	* from which items are never deleted. This allows for lock-free
	* reading of the list so long as assignments to the zs_next and
	* reads from zs_minor are performed atomically. Empty items are
	* indicated by storing -1 into zs_minor.
	*/
	typedef struct zfsdev_state {
	struct zfsdev_state zs_next; / next zfsdev_state_t link */
	minor_t zs_minor; /* made up minor number */
	void zs_onexit; / onexit data */
	void zs_zevent; / zevent data */
	} zfsdev_state_t;

	extern void *zfsdev_get_state(minor_t minor, enum zfsdev_state_type which);
	-extern int zfsdev_getminor(int fd, minor_t *minorp);
	+extern int zfsdev_getminor(zfs_file_t fp, minor_t minorp);
	extern minor_t zfsdev_minor_alloc(void);

	extern uint_t zfs_fsyncer_key;
	extern uint_t zfs_allow_log_key;

	#endif /* _KERNEL */

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_ZFS_IOCTL_H */
	diff --git a/sys/contrib/openzfs/include/sys/zfs_onexit.h b/sys/contrib/openzfs/include/sys/zfs_onexit.h
	index 0fab23ff849b..fd3030e3ac2d 100644
	--- a/sys/contrib/openzfs/include/sys/zfs_onexit.h
	+++ b/sys/contrib/openzfs/include/sys/zfs_onexit.h
	@@ -1,63 +1,63 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2020 by Delphix. All rights reserved.
	*/

	#ifndef _SYS_ZFS_ONEXIT_H
	#define _SYS_ZFS_ONEXIT_H

	#include <sys/zfs_context.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	#ifdef _KERNEL

	typedef struct zfs_onexit {
	kmutex_t zo_lock;
	list_t zo_actions;
	} zfs_onexit_t;

	typedef struct zfs_onexit_action_node {
	list_node_t za_link;
	void (za_func)(void );
	void *za_data;
	} zfs_onexit_action_node_t;

	extern void zfs_onexit_init(zfs_onexit_t **zo);
	extern void zfs_onexit_destroy(zfs_onexit_t *zo);

	#endif

	-extern int zfs_onexit_fd_hold(int fd, minor_t *minorp);
	-extern void zfs_onexit_fd_rele(int fd);
	+extern zfs_file_t zfs_onexit_fd_hold(int fd, minor_t minorp);
	+extern void zfs_onexit_fd_rele(zfs_file_t *);
	extern int zfs_onexit_add_cb(minor_t minor, void (func)(void ), void *data,
	uint64_t *action_handle);

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_ZFS_ONEXIT_H */
	diff --git a/sys/contrib/openzfs/include/sys/zfs_refcount.h b/sys/contrib/openzfs/include/sys/zfs_refcount.h
	index fc0cbea1cf7c..1e6449472e38 100644
	--- a/sys/contrib/openzfs/include/sys/zfs_refcount.h
	+++ b/sys/contrib/openzfs/include/sys/zfs_refcount.h
	@@ -1,126 +1,126 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
	*/

	#ifndef _SYS_ZFS_REFCOUNT_H
	#define _SYS_ZFS_REFCOUNT_H

	#include <sys/inttypes.h>
	#include <sys/list.h>
	#include <sys/zfs_context.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* If the reference is held only by the calling function and not any
	* particular object, use FTAG (which is a string) for the holder_tag.
	* Otherwise, use the object that holds the reference.
	*/
	#define FTAG ((char *)(uintptr_t)__func__)

	#ifdef ZFS_DEBUG
	typedef struct reference {
	list_node_t ref_link;
	const void *ref_holder;
	uint64_t ref_number;
	uint8_t *ref_removed;
	} reference_t;

	typedef struct refcount {
	kmutex_t rc_mtx;
	boolean_t rc_tracked;
	list_t rc_list;
	list_t rc_removed;
	uint64_t rc_count;
	uint64_t rc_removed_count;
	} zfs_refcount_t;

	/*
	* Note: zfs_refcount_t must be initialized with
	* refcount_create[_untracked]()
	*/

	void zfs_refcount_create(zfs_refcount_t *);
	void zfs_refcount_create_untracked(zfs_refcount_t *);
	void zfs_refcount_create_tracked(zfs_refcount_t *);
	void zfs_refcount_destroy(zfs_refcount_t *);
	void zfs_refcount_destroy_many(zfs_refcount_t *, uint64_t);
	int zfs_refcount_is_zero(zfs_refcount_t *);
	int64_t zfs_refcount_count(zfs_refcount_t *);
	int64_t zfs_refcount_add(zfs_refcount_t , const void );
	int64_t zfs_refcount_remove(zfs_refcount_t , const void );
	int64_t zfs_refcount_add_many(zfs_refcount_t , uint64_t, const void );
	int64_t zfs_refcount_remove_many(zfs_refcount_t , uint64_t, const void );
	void zfs_refcount_transfer(zfs_refcount_t , zfs_refcount_t );
	void zfs_refcount_transfer_ownership(zfs_refcount_t , const void ,
	const void *);
	void zfs_refcount_transfer_ownership_many(zfs_refcount_t *, uint64_t,
	const void , const void );
	boolean_t zfs_refcount_held(zfs_refcount_t , const void );
	boolean_t zfs_refcount_not_held(zfs_refcount_t , const void );

	void zfs_refcount_init(void);
	void zfs_refcount_fini(void);

	#else /* ZFS_DEBUG */

	typedef struct refcount {
	uint64_t rc_count;
	} zfs_refcount_t;

	#define zfs_refcount_create(rc) ((rc)->rc_count = 0)
	#define zfs_refcount_create_untracked(rc) ((rc)->rc_count = 0)
	#define zfs_refcount_create_tracked(rc) ((rc)->rc_count = 0)
	#define zfs_refcount_destroy(rc) ((rc)->rc_count = 0)
	#define zfs_refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
	-#define zfs_refcount_is_zero(rc) ((rc)->rc_count == 0)
	-#define zfs_refcount_count(rc) ((rc)->rc_count)
	+#define zfs_refcount_is_zero(rc) (zfs_refcount_count(rc) == 0)
	+#define zfs_refcount_count(rc) atomic_load_64(&(rc)->rc_count)
	#define zfs_refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count)
	#define zfs_refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count)
	#define zfs_refcount_add_many(rc, number, holder) \
	atomic_add_64_nv(&(rc)->rc_count, number)
	#define zfs_refcount_remove_many(rc, number, holder) \
	atomic_add_64_nv(&(rc)->rc_count, -number)
	#define zfs_refcount_transfer(dst, src) { \
	- uint64_t __tmp = (src)->rc_count; \
	+ uint64_t __tmp = zfs_refcount_count(src); \
	atomic_add_64(&(src)->rc_count, -__tmp); \
	atomic_add_64(&(dst)->rc_count, __tmp); \
	}
	#define zfs_refcount_transfer_ownership(rc, ch, nh) ((void)0)
	#define zfs_refcount_transfer_ownership_many(rc, nr, ch, nh) ((void)0)
	-#define zfs_refcount_held(rc, holder) ((rc)->rc_count > 0)
	+#define zfs_refcount_held(rc, holder) (zfs_refcount_count(rc) > 0)
	#define zfs_refcount_not_held(rc, holder) (B_TRUE)

	#define zfs_refcount_init()
	#define zfs_refcount_fini()

	#endif /* ZFS_DEBUG */

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_REFCOUNT_H */
	diff --git a/sys/contrib/openzfs/include/sys/zio.h b/sys/contrib/openzfs/include/sys/zio.h
	index 3728550134ba..97bd1a26ad40 100644
	--- a/sys/contrib/openzfs/include/sys/zio.h
	+++ b/sys/contrib/openzfs/include/sys/zio.h
	@@ -1,707 +1,707 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2012, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	* Copyright (c) 2013, Joyent, Inc. All rights reserved.
	* Copyright 2016 Toomas Soome <tsoome@me.com>
	* Copyright (c) 2019, Allan Jude
	* Copyright (c) 2019, Klara Inc.
	* Copyright (c) 2019-2020, Michael Niewöhner
	*/

	#ifndef _ZIO_H
	#define _ZIO_H

	#include <sys/zio_priority.h>
	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/txg.h>
	#include <sys/avl.h>
	#include <sys/fs/zfs.h>
	#include <sys/zio_impl.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* Embedded checksum
	*/
	#define ZEC_MAGIC 0x210da7ab10c7a11ULL

	typedef struct zio_eck {
	uint64_t zec_magic; /* for validation, endianness */
	zio_cksum_t zec_cksum; /* 256-bit checksum */
	} zio_eck_t;

	/*
	* Gang block headers are self-checksumming and contain an array
	* of block pointers.
	*/
	#define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE
	#define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \
	sizeof (zio_eck_t)) / sizeof (blkptr_t))
	#define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \
	sizeof (zio_eck_t) - \
	(SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
	sizeof (uint64_t))

	typedef struct zio_gbh {
	blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
	uint64_t zg_filler[SPA_GBH_FILLER];
	zio_eck_t zg_tail;
	} zio_gbh_phys_t;

	enum zio_checksum {
	ZIO_CHECKSUM_INHERIT = 0,
	ZIO_CHECKSUM_ON,
	ZIO_CHECKSUM_OFF,
	ZIO_CHECKSUM_LABEL,
	ZIO_CHECKSUM_GANG_HEADER,
	ZIO_CHECKSUM_ZILOG,
	ZIO_CHECKSUM_FLETCHER_2,
	ZIO_CHECKSUM_FLETCHER_4,
	ZIO_CHECKSUM_SHA256,
	ZIO_CHECKSUM_ZILOG2,
	ZIO_CHECKSUM_NOPARITY,
	ZIO_CHECKSUM_SHA512,
	ZIO_CHECKSUM_SKEIN,
	#if !defined(__FreeBSD__)
	ZIO_CHECKSUM_EDONR,
	#endif
	ZIO_CHECKSUM_FUNCTIONS
	};

	/*
	* The number of "legacy" compression functions which can be set on individual
	* objects.
	*/
	#define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2

	#define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
	#define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON

	#define ZIO_CHECKSUM_MASK 0xffULL
	#define ZIO_CHECKSUM_VERIFY (1 << 8)

	#define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256

	/* supported encryption algorithms */
	enum zio_encrypt {
	ZIO_CRYPT_INHERIT = 0,
	ZIO_CRYPT_ON,
	ZIO_CRYPT_OFF,
	ZIO_CRYPT_AES_128_CCM,
	ZIO_CRYPT_AES_192_CCM,
	ZIO_CRYPT_AES_256_CCM,
	ZIO_CRYPT_AES_128_GCM,
	ZIO_CRYPT_AES_192_GCM,
	ZIO_CRYPT_AES_256_GCM,
	ZIO_CRYPT_FUNCTIONS
	};

	#define ZIO_CRYPT_ON_VALUE ZIO_CRYPT_AES_256_GCM
	#define ZIO_CRYPT_DEFAULT ZIO_CRYPT_OFF

	/* macros defining encryption lengths */
	#define ZIO_OBJSET_MAC_LEN 32
	#define ZIO_DATA_IV_LEN 12
	#define ZIO_DATA_SALT_LEN 8
	#define ZIO_DATA_MAC_LEN 16

	/*
	* The number of "legacy" compression functions which can be set on individual
	* objects.
	*/
	#define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4

	/*
	* The meaning of "compress = on" selected by the compression features enabled
	* on a given pool.
	*/
	#define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB
	#define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4

	#define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF

	#define BOOTFS_COMPRESS_VALID(compress) \
	((compress) == ZIO_COMPRESS_LZJB \|\| \
	(compress) == ZIO_COMPRESS_LZ4 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_1 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_2 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_3 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_4 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_5 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_6 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_7 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_8 \|\| \
	(compress) == ZIO_COMPRESS_GZIP_9 \|\| \
	(compress) == ZIO_COMPRESS_ZLE \|\| \
	(compress) == ZIO_COMPRESS_ZSTD \|\| \
	(compress) == ZIO_COMPRESS_ON \|\| \
	(compress) == ZIO_COMPRESS_OFF)


	#define ZIO_COMPRESS_ALGO(x) (x & SPA_COMPRESSMASK)
	#define ZIO_COMPRESS_LEVEL(x) ((x & ~SPA_COMPRESSMASK) >> SPA_COMPRESSBITS)
	#define ZIO_COMPRESS_RAW(type, level) (type \| ((level) << SPA_COMPRESSBITS))

	#define ZIO_COMPLEVEL_ZSTD(level) \
	ZIO_COMPRESS_RAW(ZIO_COMPRESS_ZSTD, level)

	#define ZIO_FAILURE_MODE_WAIT 0
	#define ZIO_FAILURE_MODE_CONTINUE 1
	#define ZIO_FAILURE_MODE_PANIC 2

	typedef enum zio_suspend_reason {
	ZIO_SUSPEND_NONE = 0,
	ZIO_SUSPEND_IOERR,
	ZIO_SUSPEND_MMP,
	} zio_suspend_reason_t;

	enum zio_flag {
	/*
	* Flags inherited by gang, ddt, and vdev children,
	* and that must be equal for two zios to aggregate
	*/
	ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
	ZIO_FLAG_IO_REPAIR = 1 << 1,
	ZIO_FLAG_SELF_HEAL = 1 << 2,
	ZIO_FLAG_RESILVER = 1 << 3,
	ZIO_FLAG_SCRUB = 1 << 4,
	ZIO_FLAG_SCAN_THREAD = 1 << 5,
	ZIO_FLAG_PHYSICAL = 1 << 6,

	#define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)

	/*
	* Flags inherited by ddt, gang, and vdev children.
	*/
	ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */
	ZIO_FLAG_SPECULATIVE = 1 << 8,
	ZIO_FLAG_CONFIG_WRITER = 1 << 9,
	ZIO_FLAG_DONT_RETRY = 1 << 10,
	ZIO_FLAG_DONT_CACHE = 1 << 11,
	ZIO_FLAG_NODATA = 1 << 12,
	ZIO_FLAG_INDUCE_DAMAGE = 1 << 13,
	ZIO_FLAG_IO_ALLOCATING = 1 << 14,

	#define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
	#define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)

	/*
	* Flags inherited by vdev children.
	*/
	ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */
	ZIO_FLAG_PROBE = 1 << 16,
	ZIO_FLAG_TRYHARD = 1 << 17,
	ZIO_FLAG_OPTIONAL = 1 << 18,

	#define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)

	/*
	* Flags not inherited by any children.
	*/
	ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */
	ZIO_FLAG_DONT_PROPAGATE = 1 << 20,
	ZIO_FLAG_IO_BYPASS = 1 << 21,
	ZIO_FLAG_IO_REWRITE = 1 << 22,
	ZIO_FLAG_RAW_COMPRESS = 1 << 23,
	ZIO_FLAG_RAW_ENCRYPT = 1 << 24,
	ZIO_FLAG_GANG_CHILD = 1 << 25,
	ZIO_FLAG_DDT_CHILD = 1 << 26,
	ZIO_FLAG_GODFATHER = 1 << 27,
	ZIO_FLAG_NOPWRITE = 1 << 28,
	ZIO_FLAG_REEXECUTED = 1 << 29,
	ZIO_FLAG_DELEGATED = 1 << 30,
	ZIO_FLAG_FASTWRITE = 1 << 31,
	};

	#define ZIO_FLAG_MUSTSUCCEED 0
	#define ZIO_FLAG_RAW (ZIO_FLAG_RAW_COMPRESS \| ZIO_FLAG_RAW_ENCRYPT)

	#define ZIO_DDT_CHILD_FLAGS(zio) \
	(((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) \| \
	ZIO_FLAG_DDT_CHILD \| ZIO_FLAG_CANFAIL)

	#define ZIO_GANG_CHILD_FLAGS(zio) \
	(((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) \| \
	ZIO_FLAG_GANG_CHILD \| ZIO_FLAG_CANFAIL)

	#define ZIO_VDEV_CHILD_FLAGS(zio) \
	(((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) \| \
	ZIO_FLAG_DONT_PROPAGATE \| ZIO_FLAG_CANFAIL)

	#define ZIO_CHILD_BIT(x) (1 << (x))
	#define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1 << (x)))

	enum zio_child {
	ZIO_CHILD_VDEV = 0,
	ZIO_CHILD_GANG,
	ZIO_CHILD_DDT,
	ZIO_CHILD_LOGICAL,
	ZIO_CHILD_TYPES
	};

	#define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV)
	#define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG)
	#define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT)
	#define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL)
	#define ZIO_CHILD_ALL_BITS \
	(ZIO_CHILD_VDEV_BIT \| ZIO_CHILD_GANG_BIT \| \
	ZIO_CHILD_DDT_BIT \| ZIO_CHILD_LOGICAL_BIT)

	enum zio_wait_type {
	ZIO_WAIT_READY = 0,
	ZIO_WAIT_DONE,
	ZIO_WAIT_TYPES
	};

	typedef void zio_done_func_t(zio_t *zio);

	extern int zio_exclude_metadata;
	extern int zio_dva_throttle_enabled;
	extern const char *zio_type_name[ZIO_TYPES];

	/*
	* A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
	* identifies any block in the pool. By convention, the meta-objset (MOS)
	* is objset 0, and the meta-dnode is object 0. This covers all blocks
	* except root blocks and ZIL blocks, which are defined as follows:
	*
	* Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
	* ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
	* dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
	* dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
	*
	* Note: this structure is called a bookmark because its original purpose
	* was to remember where to resume a pool-wide traverse.
	*
	* Note: this structure is passed between userland and the kernel, and is
	* stored on disk (by virtue of being incorporated into other on-disk
	* structures, e.g. dsl_scan_phys_t).
	*/
	struct zbookmark_phys {
	uint64_t zb_objset;
	uint64_t zb_object;
	int64_t zb_level;
	uint64_t zb_blkid;
	};

	#define SET_BOOKMARK(zb, objset, object, level, blkid) \
	{ \
	(zb)->zb_objset = objset; \
	(zb)->zb_object = object; \
	(zb)->zb_level = level; \
	(zb)->zb_blkid = blkid; \
	}

	#define ZB_DESTROYED_OBJSET (-1ULL)

	#define ZB_ROOT_OBJECT (0ULL)
	#define ZB_ROOT_LEVEL (-1LL)
	#define ZB_ROOT_BLKID (0ULL)

	#define ZB_ZIL_OBJECT (0ULL)
	#define ZB_ZIL_LEVEL (-2LL)

	#define ZB_DNODE_LEVEL (-3LL)
	#define ZB_DNODE_BLKID (0ULL)

	#define ZB_IS_ZERO(zb) \
	((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
	(zb)->zb_level == 0 && (zb)->zb_blkid == 0)
	#define ZB_IS_ROOT(zb) \
	((zb)->zb_object == ZB_ROOT_OBJECT && \
	(zb)->zb_level == ZB_ROOT_LEVEL && \
	(zb)->zb_blkid == ZB_ROOT_BLKID)

	typedef struct zio_prop {
	enum zio_checksum zp_checksum;
	enum zio_compress zp_compress;
	uint8_t zp_complevel;
	dmu_object_type_t zp_type;
	uint8_t zp_level;
	uint8_t zp_copies;
	boolean_t zp_dedup;
	boolean_t zp_dedup_verify;
	boolean_t zp_nopwrite;
	boolean_t zp_encrypt;
	boolean_t zp_byteorder;
	uint8_t zp_salt[ZIO_DATA_SALT_LEN];
	uint8_t zp_iv[ZIO_DATA_IV_LEN];
	uint8_t zp_mac[ZIO_DATA_MAC_LEN];
	uint32_t zp_zpl_smallblk;
	} zio_prop_t;

	typedef struct zio_cksum_report zio_cksum_report_t;

	typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
	const abd_t *good_data);
	typedef void zio_cksum_free_f(void *cbdata, size_t size);

	struct zio_bad_cksum; /* defined in zio_checksum.h */
	struct dnode_phys;
	struct abd;

	struct zio_cksum_report {
	struct zio_cksum_report *zcr_next;
	nvlist_t *zcr_ereport;
	nvlist_t *zcr_detector;
	void *zcr_cbdata;
	size_t zcr_cbinfo; /* passed to zcr_free() */
	uint64_t zcr_sector;
	uint64_t zcr_align;
	uint64_t zcr_length;
	zio_cksum_finish_f *zcr_finish;
	zio_cksum_free_f *zcr_free;

	/* internal use only */
	struct zio_bad_cksum zcr_ckinfo; / information from failure */
	};

	typedef struct zio_vsd_ops {
	zio_done_func_t *vsd_free;
	} zio_vsd_ops_t;

	typedef struct zio_gang_node {
	zio_gbh_phys_t *gn_gbh;
	struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
	} zio_gang_node_t;

	typedef zio_t zio_gang_issue_func_t(zio_t zio, blkptr_t *bp,
	zio_gang_node_t gn, struct abd data, uint64_t offset);

	typedef void zio_transform_func_t(zio_t zio, struct abd data, uint64_t size);

	typedef struct zio_transform {
	struct abd *zt_orig_abd;
	uint64_t zt_orig_size;
	uint64_t zt_bufsize;
	zio_transform_func_t *zt_transform;
	struct zio_transform *zt_next;
	} zio_transform_t;

	typedef zio_t zio_pipe_stage_t(zio_t zio);

	/*
	* The io_reexecute flags are distinct from io_flags because the child must
	* be able to propagate them to the parent. The normal io_flags are local
	* to the zio, not protected by any lock, and not modifiable by children;
	* the reexecute flags are protected by io_lock, modifiable by children,
	* and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
	*/
	#define ZIO_REEXECUTE_NOW 0x01
	#define ZIO_REEXECUTE_SUSPEND 0x02

	/*
	* The io_trim flags are used to specify the type of TRIM to perform. They
	* only apply to ZIO_TYPE_TRIM zios are distinct from io_flags.
	*/
	enum trim_flag {
	ZIO_TRIM_SECURE = 1 << 0,
	};

	typedef struct zio_alloc_list {
	list_t zal_list;
	uint64_t zal_size;
	} zio_alloc_list_t;

	typedef struct zio_link {
	zio_t *zl_parent;
	zio_t *zl_child;
	list_node_t zl_parent_node;
	list_node_t zl_child_node;
	} zio_link_t;

	struct zio {
	/* Core information about this I/O */
	zbookmark_phys_t io_bookmark;
	zio_prop_t io_prop;
	zio_type_t io_type;
	enum zio_child io_child_type;
	enum trim_flag io_trim_flags;
	int io_cmd;
	zio_priority_t io_priority;
	uint8_t io_reexecute;
	uint8_t io_state[ZIO_WAIT_TYPES];
	uint64_t io_txg;
	spa_t *io_spa;
	blkptr_t *io_bp;
	blkptr_t *io_bp_override;
	blkptr_t io_bp_copy;
	list_t io_parent_list;
	list_t io_child_list;
	zio_t *io_logical;
	zio_transform_t *io_transform_stack;

	/* Callback info */
	zio_done_func_t *io_ready;
	zio_done_func_t *io_children_ready;
	zio_done_func_t *io_physdone;
	zio_done_func_t *io_done;
	void *io_private;
	int64_t io_prev_space_delta; /* DMU private */
	blkptr_t io_bp_orig;
	/* io_lsize != io_orig_size iff this is a raw write */
	uint64_t io_lsize;

	/* Data represented by this I/O */
	struct abd *io_abd;
	struct abd *io_orig_abd;
	uint64_t io_size;
	uint64_t io_orig_size;

	/* Stuff for the vdev stack */
	vdev_t *io_vd;
	void *io_vsd;
	const zio_vsd_ops_t *io_vsd_ops;
	metaslab_class_t io_metaslab_class; / dva throttle class */

	uint64_t io_offset;
	hrtime_t io_timestamp; /* submitted at */
	hrtime_t io_queued_timestamp;
	hrtime_t io_target_timestamp;
	hrtime_t io_delta; /* vdev queue service delta */
	hrtime_t io_delay; /* Device access time (disk or */
	/* file). */
	avl_node_t io_queue_node;
	avl_node_t io_offset_node;
	avl_node_t io_alloc_node;
	zio_alloc_list_t io_alloc_list;

	/* Internal pipeline state */
	enum zio_flag io_flags;
	enum zio_stage io_stage;
	enum zio_stage io_pipeline;
	enum zio_flag io_orig_flags;
	enum zio_stage io_orig_stage;
	enum zio_stage io_orig_pipeline;
	enum zio_stage io_pipeline_trace;
	int io_error;
	int io_child_error[ZIO_CHILD_TYPES];
	uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
	uint64_t io_child_count;
	uint64_t io_phys_children;
	uint64_t io_parent_count;
	uint64_t *io_stall;
	zio_t *io_gang_leader;
	zio_gang_node_t *io_gang_tree;
	void *io_executor;
	void *io_waiter;
	void *io_bio;
	kmutex_t io_lock;
	kcondvar_t io_cv;
	int io_allocator;

	/* FMA state */
	zio_cksum_report_t *io_cksum_report;
	uint64_t io_ena;

	/* Taskq dispatching state */
	taskq_ent_t io_tqent;
	};

	enum blk_verify_flag {
	BLK_VERIFY_ONLY,
	BLK_VERIFY_LOG,
	BLK_VERIFY_HALT
	};

	extern int zio_bookmark_compare(const void , const void );

	extern zio_t zio_null(zio_t pio, spa_t spa, vdev_t vd,
	zio_done_func_t done, void priv, enum zio_flag flags);

	extern zio_t zio_root(spa_t spa,
	zio_done_func_t done, void priv, enum zio_flag flags);

	extern zio_t zio_read(zio_t pio, spa_t spa, const blkptr_t bp,
	struct abd data, uint64_t lsize, zio_done_func_t done, void *priv,
	zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);

	extern zio_t zio_write(zio_t pio, spa_t spa, uint64_t txg, blkptr_t bp,
	struct abd data, uint64_t size, uint64_t psize, const zio_prop_t zp,
	zio_done_func_t ready, zio_done_func_t children_ready,
	zio_done_func_t physdone, zio_done_func_t done,
	void *priv, zio_priority_t priority, enum zio_flag flags,
	const zbookmark_phys_t *zb);

	extern zio_t zio_rewrite(zio_t pio, spa_t spa, uint64_t txg, blkptr_t bp,
	struct abd data, uint64_t size, zio_done_func_t done, void *priv,
	zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);

	extern void zio_write_override(zio_t zio, blkptr_t bp, int copies,
	boolean_t nopwrite);

	extern void zio_free(spa_t spa, uint64_t txg, const blkptr_t bp);

	extern zio_t zio_claim(zio_t pio, spa_t *spa, uint64_t txg,
	const blkptr_t *bp,
	zio_done_func_t done, void priv, enum zio_flag flags);

	extern zio_t zio_ioctl(zio_t pio, spa_t spa, vdev_t vd, int cmd,
	zio_done_func_t done, void priv, enum zio_flag flags);

	extern zio_t zio_trim(zio_t pio, vdev_t *vd, uint64_t offset, uint64_t size,
	zio_done_func_t done, void priv, zio_priority_t priority,
	enum zio_flag flags, enum trim_flag trim_flags);

	extern zio_t zio_read_phys(zio_t pio, vdev_t *vd, uint64_t offset,
	uint64_t size, struct abd *data, int checksum,
	zio_done_func_t done, void priv, zio_priority_t priority,
	enum zio_flag flags, boolean_t labels);

	extern zio_t zio_write_phys(zio_t pio, vdev_t *vd, uint64_t offset,
	uint64_t size, struct abd *data, int checksum,
	zio_done_func_t done, void priv, zio_priority_t priority,
	enum zio_flag flags, boolean_t labels);

	extern zio_t zio_free_sync(zio_t pio, spa_t *spa, uint64_t txg,
	const blkptr_t *bp, enum zio_flag flags);

	extern int zio_alloc_zil(spa_t spa, objset_t os, uint64_t txg,
	blkptr_t new_bp, uint64_t size, boolean_t slog);
	extern void zio_flush(zio_t zio, vdev_t vd);
	extern void zio_shrink(zio_t *zio, uint64_t size);

	extern int zio_wait(zio_t *zio);
	extern void zio_nowait(zio_t *zio);
	-extern void zio_execute(zio_t *zio);
	-extern void zio_interrupt(zio_t *zio);
	+extern void zio_execute(void *zio);
	+extern void zio_interrupt(void *zio);
	extern void zio_delay_init(zio_t *zio);
	extern void zio_delay_interrupt(zio_t *zio);
	extern void zio_deadman(zio_t zio, char tag);

	extern zio_t zio_walk_parents(zio_t cio, zio_link_t **);
	extern zio_t zio_walk_children(zio_t pio, zio_link_t **);
	extern zio_t zio_unique_parent(zio_t cio);
	extern void zio_add_child(zio_t pio, zio_t cio);

	extern void *zio_buf_alloc(size_t size);
	extern void zio_buf_free(void *buf, size_t size);
	extern void *zio_data_buf_alloc(size_t size);
	extern void zio_data_buf_free(void *buf, size_t size);

	extern void zio_push_transform(zio_t zio, struct abd abd, uint64_t size,
	uint64_t bufsize, zio_transform_func_t *transform);
	extern void zio_pop_transforms(zio_t *zio);

	extern void zio_resubmit_stage_async(void *);

	extern zio_t zio_vdev_child_io(zio_t zio, blkptr_t bp, vdev_t vd,
	uint64_t offset, struct abd *data, uint64_t size, int type,
	zio_priority_t priority, enum zio_flag flags,
	zio_done_func_t done, void priv);

	extern zio_t zio_vdev_delegated_io(vdev_t vd, uint64_t offset,
	struct abd *data, uint64_t size, zio_type_t type, zio_priority_t priority,
	enum zio_flag flags, zio_done_func_t done, void priv);

	extern void zio_vdev_io_bypass(zio_t *zio);
	extern void zio_vdev_io_reissue(zio_t *zio);
	extern void zio_vdev_io_redone(zio_t *zio);

	extern void zio_change_priority(zio_t *pio, zio_priority_t priority);

	extern void zio_checksum_verified(zio_t *zio);
	extern int zio_worst_error(int e1, int e2);

	extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
	enum zio_checksum parent);
	extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
	enum zio_checksum child, enum zio_checksum parent);
	extern enum zio_compress zio_compress_select(spa_t *spa,
	enum zio_compress child, enum zio_compress parent);
	extern uint8_t zio_complevel_select(spa_t *spa, enum zio_compress compress,
	uint8_t child, uint8_t parent);

	extern void zio_suspend(spa_t spa, zio_t zio, zio_suspend_reason_t);
	extern int zio_resume(spa_t *spa);
	extern void zio_resume_wait(spa_t *spa);

	extern boolean_t zfs_blkptr_verify(spa_t spa, const blkptr_t bp,
	boolean_t config_held, enum blk_verify_flag blk_verify);

	/*
	* Initial setup and teardown.
	*/
	extern void zio_init(void);
	extern void zio_fini(void);

	/*
	* Fault injection
	*/
	struct zinject_record;
	extern uint32_t zio_injection_enabled;
	extern int zio_inject_fault(char name, int flags, int id,
	struct zinject_record *record);
	extern int zio_inject_list_next(int id, char name, size_t buflen,
	struct zinject_record *record);
	extern int zio_clear_fault(int id);
	extern void zio_handle_panic_injection(spa_t spa, char tag, uint64_t type);
	extern int zio_handle_decrypt_injection(spa_t spa, const zbookmark_phys_t zb,
	uint64_t type, int error);
	extern int zio_handle_fault_injection(zio_t *zio, int error);
	extern int zio_handle_device_injection(vdev_t vd, zio_t zio, int error);
	extern int zio_handle_device_injections(vdev_t vd, zio_t zio, int err1,
	int err2);
	extern int zio_handle_label_injection(zio_t *zio, int error);
	extern void zio_handle_ignored_writes(zio_t *zio);
	extern hrtime_t zio_handle_io_delay(zio_t *zio);

	/*
	* Checksum ereport functions
	*/
	extern int zfs_ereport_start_checksum(spa_t spa, vdev_t vd,
	const zbookmark_phys_t zb, struct zio zio, uint64_t offset,
	uint64_t length, struct zio_bad_cksum *info);
	extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
	const abd_t good_data, const abd_t bad_data, boolean_t drop_if_identical);

	extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);

	/* If we have the good data in hand, this function can be used */
	extern int zfs_ereport_post_checksum(spa_t spa, vdev_t vd,
	const zbookmark_phys_t zb, struct zio zio, uint64_t offset,
	uint64_t length, const abd_t good_data, const abd_t bad_data,
	struct zio_bad_cksum *info);

	void zio_vsd_default_cksum_report(zio_t zio, zio_cksum_report_t zcr);

	/* Called from spa_sync(), but primarily an injection handler */
	extern void spa_handle_ignored_writes(spa_t *spa);

	/* zbookmark_phys functions */
	boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
	const zbookmark_phys_t subtree_root, const zbookmark_phys_t last_block);
	int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
	uint8_t ibs2, const zbookmark_phys_t zb1, const zbookmark_phys_t zb2);

	#ifdef __cplusplus
	}
	#endif

	#endif /* _ZIO_H */
	diff --git a/sys/contrib/openzfs/include/sys/zstd/zstd.h b/sys/contrib/openzfs/include/sys/zstd/zstd.h
	index 8fe4a24828a5..e87dda1b18d1 100644
	--- a/sys/contrib/openzfs/include/sys/zstd/zstd.h
	+++ b/sys/contrib/openzfs/include/sys/zstd/zstd.h
	@@ -1,101 +1,227 @@
	/*
	* BSD 3-Clause New License (https://spdx.org/licenses/BSD-3-Clause.html)
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* 3. Neither the name of the copyright holder nor the names of its
	* contributors may be used to endorse or promote products derived from this
	* software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*/

	/*
	* Copyright (c) 2016-2018, Klara Inc.
	* Copyright (c) 2016-2018, Allan Jude
	* Copyright (c) 2018-2020, Sebastian Gottschall
	* Copyright (c) 2019-2020, Michael Niewöhner
	* Copyright (c) 2020, The FreeBSD Foundation [1]
	*
	* [1] Portions of this software were developed by Allan Jude
	* under sponsorship from the FreeBSD Foundation.
	*/

	#ifndef _ZFS_ZSTD_H
	#define _ZFS_ZSTD_H

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* ZSTD block header
	* NOTE: all fields in this header are in big endian order.
	*/
	typedef struct zfs_zstd_header {
	/* Compressed size of data */
	uint32_t c_len;

	/*
	* Version and compression level
	- * We use a union to be able to big endian encode a single 32 bit
	- * unsigned integer, but still access the individual bitmasked
	- * components easily.
	+ * We used to use a union to reference compression level
	+ * and version easily, but as it turns out, relying on the
	+ * ordering of bitfields is not remotely portable.
	+ * So now we have get/set functions in zfs_zstd.c for
	+ * manipulating this in just the right way forever.
	*/
	- union {
	- uint32_t raw_version_level;
	- struct {
	- uint32_t version : 24;
	- uint8_t level;
	- };
	- };
	-
	+ uint32_t raw_version_level;
	char data[];
	} zfs_zstdhdr_t;

	+/*
	+ * Simple struct to pass the data from raw_version_level around.
	+ */
	+typedef struct zfs_zstd_meta {
	+ uint8_t level;
	+ uint32_t version;
	+} zfs_zstdmeta_t;
	+
	/*
	* kstat helper macros
	*/
	#define ZSTDSTAT(stat) (zstd_stats.stat.value.ui64)
	#define ZSTDSTAT_ADD(stat, val) \
	atomic_add_64(&zstd_stats.stat.value.ui64, (val))
	#define ZSTDSTAT_SUB(stat, val) \
	atomic_sub_64(&zstd_stats.stat.value.ui64, (val))
	#define ZSTDSTAT_BUMP(stat) ZSTDSTAT_ADD(stat, 1)

	/* (de)init for user space / kernel emulation */
	int zstd_init(void);
	void zstd_fini(void);

	size_t zfs_zstd_compress(void s_start, void d_start, size_t s_len,
	size_t d_len, int level);
	int zfs_zstd_get_level(void s_start, size_t s_len, uint8_t level);
	int zfs_zstd_decompress_level(void s_start, void d_start, size_t s_len,
	size_t d_len, uint8_t *level);
	int zfs_zstd_decompress(void s_start, void d_start, size_t s_len,
	size_t d_len, int n);
	void zfs_zstd_cache_reap_now(void);

	+/*
	+ * So, the reason we have all these complicated set/get functions is that
	+ * originally, in the zstd "header" we wrote out to disk, we used a 32-bit
	+ * bitfield to store the "level" (8 bits) and "version" (24 bits).
	+ *
	+ * Unfortunately, bitfields make few promises about how they're arranged in
	+ * memory...
	+ *
	+ * By way of example, if we were using version 1.4.5 and level 3, it'd be
	+ * level = 0x03, version = 10405/0x0028A5, which gets broken into Vhigh = 0x00,
	+ * Vmid = 0x28, Vlow = 0xA5. We include these positions below to help follow
	+ * which data winds up where.
	+ *
	+ * As a consequence, we wound up with little endian platforms with a layout
	+ * like this in memory:
	+ *
	+ * 0 8 16 24 32
	+ * +-------+-------+-------+-------+
	+ * \| Vlow \| Vmid \| Vhigh \| level \|
	+ * +-------+-------+-------+-------+
	+ * =A5 =28 =00 =03
	+ *
	+ * ...and then, after being run through BE_32(), serializing this out to
	+ * disk:
	+ *
	+ * 0 8 16 24 32
	+ * +-------+-------+-------+-------+
	+ * \| level \| Vhigh \| Vmid \| Vlow \|
	+ * +-------+-------+-------+-------+
	+ * =03 =00 =28 =A5
	+ *
	+ * while on big-endian systems, since BE_32() is a noop there, both in
	+ * memory and on disk, we wind up with:
	+ *
	+ * 0 8 16 24 32
	+ * +-------+-------+-------+-------+
	+ * \| Vhigh \| Vmid \| Vlow \| level \|
	+ * +-------+-------+-------+-------+
	+ * =00 =28 =A5 =03
	+ *
	+ * (Vhigh is always 0 until version exceeds 6.55.35. Vmid and Vlow are the
	+ * other two bytes of the "version" data.)
	+ *
	+ * So now we use the BF32_SET macros to get consistent behavior (the
	+ * ondisk LE encoding, since x86 currently rules the world) across
	+ * platforms, but the "get" behavior requires that we check each of the
	+ * bytes in the aforementioned former-bitfield for 0x00, and from there,
	+ * we can know which possible layout we're dealing with. (Only the two
	+ * that have been observed in the wild are illustrated above, but handlers
	+ * for all 4 positions of 0x00 are implemented.
	+ */
	+
	+static inline void
	+zfs_get_hdrmeta(const zfs_zstdhdr_t blob, zfs_zstdmeta_t res)
	+{
	+ uint32_t raw = blob->raw_version_level;
	+ uint8_t findme = 0xff;
	+ int shift;
	+ for (shift = 0; shift < 4; shift++) {
	+ findme = BF32_GET(raw, 8*shift, 8);
	+ if (findme == 0)
	+ break;
	+ }
	+ switch (shift) {
	+ case 0:
	+ res->level = BF32_GET(raw, 24, 8);
	+ res->version = BSWAP_32(raw);
	+ res->version = BF32_GET(res->version, 8, 24);
	+ break;
	+ case 1:
	+ res->level = BF32_GET(raw, 0, 8);
	+ res->version = BSWAP_32(raw);
	+ res->version = BF32_GET(res->version, 0, 24);
	+ break;
	+ case 2:
	+ res->level = BF32_GET(raw, 24, 8);
	+ res->version = BF32_GET(raw, 0, 24);
	+ break;
	+ case 3:
	+ res->level = BF32_GET(raw, 0, 8);
	+ res->version = BF32_GET(raw, 8, 24);
	+ break;
	+ default:
	+ res->level = 0;
	+ res->version = 0;
	+ break;
	+ }
	+}
	+
	+static inline uint8_t
	+zfs_get_hdrlevel(const zfs_zstdhdr_t *blob)
	+{
	+ uint8_t level = 0;
	+ zfs_zstdmeta_t res;
	+ zfs_get_hdrmeta(blob, &res);
	+ level = res.level;
	+ return (level);
	+}
	+
	+static inline uint32_t
	+zfs_get_hdrversion(const zfs_zstdhdr_t *blob)
	+{
	+ uint32_t version = 0;
	+ zfs_zstdmeta_t res;
	+ zfs_get_hdrmeta(blob, &res);
	+ version = res.version;
	+ return (version);
	+
	+}
	+
	+static inline void
	+zfs_set_hdrversion(zfs_zstdhdr_t *blob, uint32_t version)
	+{
	+ BF32_SET(blob->raw_version_level, 0, 24, version);
	+}
	+
	+static inline void
	+zfs_set_hdrlevel(zfs_zstdhdr_t *blob, uint8_t level)
	+{
	+ BF32_SET(blob->raw_version_level, 24, 8, level);
	+}
	+
	+
	#ifdef __cplusplus
	}
	#endif

	#endif /* _ZFS_ZSTD_H */
	diff --git a/sys/contrib/openzfs/include/sys/zthr.h b/sys/contrib/openzfs/include/sys/zthr.h
	index ae8c57e9eea2..19be89eeebe5 100644
	--- a/sys/contrib/openzfs/include/sys/zthr.h
	+++ b/sys/contrib/openzfs/include/sys/zthr.h
	@@ -1,42 +1,43 @@
	/*
	* CDDL HEADER START
	*
	* This file and its contents are supplied under the terms of the
	* Common Development and Distribution License ("CDDL"), version 1.0.
	* You may only use this file in accordance with the terms of version
	* 1.0 of the CDDL.
	*
	* A full copy of the text of the CDDL should have accompanied this
	* source. A copy of the CDDL is also available via the Internet at
	* http://www.illumos.org/license/CDDL.
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2017, 2018 by Delphix. All rights reserved.
	*/

	#ifndef _SYS_ZTHR_H
	#define _SYS_ZTHR_H

	typedef struct zthr zthr_t;
	typedef void (zthr_func_t)(void , zthr_t );
	typedef boolean_t (zthr_checkfunc_t)(void , zthr_t );

	extern zthr_t zthr_create(const char zthr_name,
	- zthr_checkfunc_t checkfunc, zthr_func_t func, void arg);
	+ zthr_checkfunc_t checkfunc, zthr_func_t func, void arg,
	+ pri_t pri);
	extern zthr_t zthr_create_timer(const char zthr_name,
	zthr_checkfunc_t checkfunc, zthr_func_t func, void *arg,
	- hrtime_t nano_wait);
	+ hrtime_t nano_wait, pri_t pri);
	extern void zthr_destroy(zthr_t *t);

	extern void zthr_wakeup(zthr_t *t);
	extern void zthr_cancel(zthr_t *t);
	extern void zthr_resume(zthr_t *t);
	extern void zthr_wait_cycle_done(zthr_t *t);

	extern boolean_t zthr_iscancelled(zthr_t *t);
	extern boolean_t zthr_has_waiters(zthr_t *t);

	#endif /* _SYS_ZTHR_H */
	diff --git a/sys/contrib/openzfs/lib/libnvpair/libnvpair.abi b/sys/contrib/openzfs/lib/libnvpair/libnvpair.abi
	index c1b50a8aa39c..9ce0ca16ebbb 100644
	--- a/sys/contrib/openzfs/lib/libnvpair/libnvpair.abi
	+++ b/sys/contrib/openzfs/lib/libnvpair/libnvpair.abi
	@@ -1,2805 +1,3297 @@
	-<abi-corpus path='libnvpair.so' architecture='elf-amd-x86_64' soname='libnvpair.so.3'>
	+<abi-corpus architecture='elf-amd-x86_64' soname='libnvpair.so.3'>
	<elf-needed>
	- <dependency name='libtirpc.so.3'/>
	<dependency name='libc.so.6'/>
	</elf-needed>
	<elf-function-symbols>
	+ <elf-symbol name='_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='dump_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_boolean' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_boolean_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_boolean_value' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_byte' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_byte_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_int16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_int16_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_int32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_int32_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_int64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_int64_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_int8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_int8_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_nvlist_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_nvpair' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_string' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_string_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_uint16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_uint16_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_uint32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_uint32_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_uint64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_uint64_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_uint8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_add_uint8_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_alloc' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_dup' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_free' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_boolean' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_boolean_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_boolean_value' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_byte' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_byte_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_int16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_int16_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_int32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_int32_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_int64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_int64_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_int8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_int8_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_nvpair' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_string' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_uint16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_uint16_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_uint32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_uint32_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_uint64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_uint64_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_uint8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_lookup_uint8_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_merge' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_num_pairs' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_pack' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_pack_free' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_remove' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_remove_nvpair' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_size' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvlist_unpack' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_boolean_value' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_byte' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_int16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_int32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_int64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_int8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_string' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_uint16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_uint32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_uint64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fnvpair_value_uint8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libspl_assertf' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nv_alloc_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nv_alloc_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nv_alloc_reset' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_boolean' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_boolean_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_boolean_value' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_byte' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_byte_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_double' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_hrtime' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_int16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_int16_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_int32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_int32_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_int64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_int64_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_int8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_int8_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_nvlist_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_nvpair' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_string' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_string_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_uint16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_uint16_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_uint32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_uint32_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_uint64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_uint64_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_uint8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_add_uint8_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_alloc' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_dup' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_empty' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_exists' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_free' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_boolean' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_boolean_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_boolean_value' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_byte' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_byte_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_double' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_hrtime' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_int16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_int16_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_int32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_int32_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_int64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_int64_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_int8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_int8_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_nv_alloc' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_nvlist_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_nvpair' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='nvlist_lookup_nvpair_embedded_index' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='9c313c2d' name='val'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_string' mangled-name='fnvlist_add_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_string'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='80f4b756' name='val'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_nvlist' mangled-name='fnvlist_add_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_nvlist'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='5ce45b60' name='val'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_nvpair' mangled-name='fnvlist_add_nvpair' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_nvpair'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='3fa542f0' name='pair'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_boolean_array' mangled-name='fnvlist_add_boolean_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_boolean_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='37e3bd22' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_byte_array' mangled-name='fnvlist_add_byte_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_byte_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='45b65157' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_int8_array' mangled-name='fnvlist_add_int8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int8_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='256d5229' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_uint8_array' mangled-name='fnvlist_add_uint8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint8_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='ae3e8ca6' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_int16_array' mangled-name='fnvlist_add_int16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int16_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='f76f73d0' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_uint16_array' mangled-name='fnvlist_add_uint16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint16_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='8a121f49' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_int32_array' mangled-name='fnvlist_add_int32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int32_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4aafb922' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_uint32_array' mangled-name='fnvlist_add_uint32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint32_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='90421557' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_int64_array' mangled-name='fnvlist_add_int64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int64_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='cb785ebf' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_uint64_array' mangled-name='fnvlist_add_uint64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint64_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='5d6479ae' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_string_array' mangled-name='fnvlist_add_string_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_string_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='f319fae0' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_nvlist_array' mangled-name='fnvlist_add_nvlist_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_nvlist_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='857bb57e' name='val'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_remove' mangled-name='fnvlist_remove' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_remove'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_remove_nvpair' mangled-name='fnvlist_remove_nvpair' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_remove_nvpair'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='3fa542f0' name='pair'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_nvpair' mangled-name='fnvlist_lookup_nvpair' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_nvpair'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='3fa542f0'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_boolean' mangled-name='fnvlist_lookup_boolean' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_boolean'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_boolean_value' mangled-name='fnvlist_lookup_boolean_value' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_boolean_value'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_byte' mangled-name='fnvlist_lookup_byte' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_byte'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_int8' mangled-name='fnvlist_lookup_int8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int8'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='ee31ee44'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_int16' mangled-name='fnvlist_lookup_int16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int16'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='23bd8cb5'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_int32' mangled-name='fnvlist_lookup_int32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int32'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='3ff5601b'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_int64' mangled-name='fnvlist_lookup_int64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int64'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='9da381c4'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint8' mangled-name='fnvlist_lookup_uint8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint8'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint16' mangled-name='fnvlist_lookup_uint16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint16'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint32' mangled-name='fnvlist_lookup_uint32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint32'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint64' mangled-name='fnvlist_lookup_uint64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint64'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_string' mangled-name='fnvlist_lookup_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_string'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_nvlist' mangled-name='fnvlist_lookup_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_nvlist'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_boolean_array' mangled-name='fnvlist_lookup_boolean_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_boolean_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='37e3bd22'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_byte_array' mangled-name='fnvlist_lookup_byte_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_byte_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='45b65157'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_int8_array' mangled-name='fnvlist_lookup_int8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int8_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='256d5229'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint8_array' mangled-name='fnvlist_lookup_uint8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint8_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='ae3e8ca6'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_int16_array' mangled-name='fnvlist_lookup_int16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int16_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='f76f73d0'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint16_array' mangled-name='fnvlist_lookup_uint16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint16_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='8a121f49'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_int32_array' mangled-name='fnvlist_lookup_int32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int32_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='4aafb922'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint32_array' mangled-name='fnvlist_lookup_uint32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint32_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='90421557'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_int64_array' mangled-name='fnvlist_lookup_int64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int64_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='cb785ebf'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint64_array' mangled-name='fnvlist_lookup_uint64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint64_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='5d6479ae'/>
	+ </function-decl>
	+ <pointer-type-def type-id='c19b74c3' size-in-bits='64' id='37e3bd22'/>
	+ <pointer-type-def type-id='a84c031d' size-in-bits='64' id='26a90f95'/>
	+ <pointer-type-def type-id='57de658a' size-in-bits='64' id='f319fae0'/>
	+ <pointer-type-def type-id='9b45d938' size-in-bits='64' id='80f4b756'/>
	+ <pointer-type-def type-id='23bd8cb5' size-in-bits='64' id='f76f73d0'/>
	+ <pointer-type-def type-id='3ff5601b' size-in-bits='64' id='4aafb922'/>
	+ <pointer-type-def type-id='9da381c4' size-in-bits='64' id='cb785ebf'/>
	+ <pointer-type-def type-id='ee31ee44' size-in-bits='64' id='256d5229'/>
	+ <pointer-type-def type-id='8e8d4be3' size-in-bits='64' id='5ce45b60'/>
	+ <pointer-type-def type-id='5ce45b60' size-in-bits='64' id='857bb57e'/>
	+ <pointer-type-def type-id='57928edf' size-in-bits='64' id='3fa542f0'/>
	+ <pointer-type-def type-id='b59d7dce' size-in-bits='64' id='78c01427'/>
	+ <typedef-decl name='boolean_t' type-id='08f5ca17' id='c19b74c3'/>
	+ <typedef-decl name='int16_t' type-id='a2185560' id='23bd8cb5'/>
	+ <typedef-decl name='int32_t' type-id='95e97e5e' id='3ff5601b'/>
	+ <typedef-decl name='int64_t' type-id='bd54fe1a' id='9da381c4'/>
	+ <typedef-decl name='int8_t' type-id='28577a57' id='ee31ee44'/>
	+ <typedef-decl name='size_t' type-id='7359adad' id='b59d7dce'/>
	+ <typedef-decl name='uchar_t' type-id='002ac4a6' id='d8bf0010'/>
	+ <typedef-decl name='uint16_t' type-id='8efea9e5' id='149c6638'/>
	+ <typedef-decl name='uint32_t' type-id='f0981eeb' id='8f92235e'/>
	+ <typedef-decl name='uint64_t' type-id='7359adad' id='9c313c2d'/>
	+ <typedef-decl name='uint8_t' type-id='002ac4a6' id='b96825af'/>
	+ <typedef-decl name='uint_t' type-id='f0981eeb' id='3502e3ff'/>
	+ <pointer-type-def type-id='d8bf0010' size-in-bits='64' id='45b65157'/>
	+ <pointer-type-def type-id='149c6638' size-in-bits='64' id='8a121f49'/>
	+ <pointer-type-def type-id='8f92235e' size-in-bits='64' id='90421557'/>
	+ <pointer-type-def type-id='9c313c2d' size-in-bits='64' id='5d6479ae'/>
	+ <pointer-type-def type-id='b96825af' size-in-bits='64' id='ae3e8ca6'/>
	+ <pointer-type-def type-id='3502e3ff' size-in-bits='64' id='4dd26a40'/>
	+ <type-decl name='void' id='48b5725f'/>
	+ <type-decl name='char' size-in-bits='8' id='a84c031d'/>
	+ <qualified-type-def type-id='26a90f95' const='yes' id='57de658a'/>
	+ <qualified-type-def type-id='a84c031d' const='yes' id='9b45d938'/>
	+ <enum-decl name='__anonymous_enum__' is-anonymous='yes' id='08f5ca17'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='B_FALSE' value='0'/>
	+ <enumerator name='B_TRUE' value='1'/>
	+ </enum-decl>
	+ <type-decl name='int' size-in-bits='32' id='95e97e5e'/>
	+ <type-decl name='long int' size-in-bits='64' id='bd54fe1a'/>
	+ <type-decl name='short int' size-in-bits='16' id='a2185560'/>
	+ <type-decl name='signed char' size-in-bits='8' id='28577a57'/>
	+ <typedef-decl name='nvlist_t' type-id='ac266fd9' id='8e8d4be3'/>
	+ <typedef-decl name='nvpair_t' type-id='1c34e459' id='57928edf'/>
	+ <type-decl name='unsigned char' size-in-bits='8' id='002ac4a6'/>
	+ <type-decl name='unsigned int' size-in-bits='32' id='f0981eeb'/>
	+ <type-decl name='unsigned long int' size-in-bits='64' id='7359adad'/>
	+ <type-decl name='unsigned short int' size-in-bits='16' id='8efea9e5'/>
	+ <class-decl name='nvlist' size-in-bits='192' is-struct='yes' visibility='default' id='ac266fd9'>
	<data-member access='public' layout-offset-in-bits='0'>
	- <var-decl name='nvp_size' type-id='type-id-24' visibility='default' filepath='../../include/sys/nvpair.h' line='74' column='1'/>
	+ <var-decl name='nvl_version' type-id='3ff5601b' visibility='default'/>
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	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int64' mangled-name='nvlist_add_int64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int64'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='9da381c4' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint64' mangled-name='nvlist_add_uint64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint64'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='9c313c2d' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_double' mangled-name='nvlist_add_double' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_double'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='a0eb0f08' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_string' mangled-name='nvlist_add_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_string'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='80f4b756' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_boolean_array' mangled-name='nvlist_add_boolean_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_boolean_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='37e3bd22' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_byte_array' mangled-name='nvlist_add_byte_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_byte_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='45b65157' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int8_array' mangled-name='nvlist_add_int8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int8_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='256d5229' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint8_array' mangled-name='nvlist_add_uint8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint8_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='ae3e8ca6' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int16_array' mangled-name='nvlist_add_int16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int16_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='f76f73d0' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint16_array' mangled-name='nvlist_add_uint16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint16_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='8a121f49' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int32_array' mangled-name='nvlist_add_int32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int32_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4aafb922' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint32_array' mangled-name='nvlist_add_uint32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint32_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='90421557' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int64_array' mangled-name='nvlist_add_int64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int64_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='cb785ebf' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint64_array' mangled-name='nvlist_add_uint64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint64_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='5d6479ae' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_string_array' mangled-name='nvlist_add_string_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_string_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='f319fae0' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_hrtime' mangled-name='nvlist_add_hrtime' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_hrtime'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='cebdd548' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_nvlist' mangled-name='nvlist_add_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_nvlist'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='5ce45b60' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_nvlist_array' mangled-name='nvlist_add_nvlist_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_nvlist_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='857bb57e' name='a'/>
	+ <parameter type-id='3502e3ff' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prev_nvpair' mangled-name='nvlist_prev_nvpair' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prev_nvpair'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='3fa542f0' name='nvp'/>
	+ <return type-id='3fa542f0'/>
	+ </function-decl>
	+ <function-decl name='nvlist_empty' mangled-name='nvlist_empty' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_empty'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_boolean' mangled-name='nvlist_lookup_boolean' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_boolean'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_boolean_value' mangled-name='nvlist_lookup_boolean_value' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_boolean_value'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='37e3bd22' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_byte' mangled-name='nvlist_lookup_byte' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_byte'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='45b65157' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int8' mangled-name='nvlist_lookup_int8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int8'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='256d5229' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint8' mangled-name='nvlist_lookup_uint8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint8'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='ae3e8ca6' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int16' mangled-name='nvlist_lookup_int16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int16'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='f76f73d0' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint16' mangled-name='nvlist_lookup_uint16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint16'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='8a121f49' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int32' mangled-name='nvlist_lookup_int32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int32'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='4aafb922' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint32' mangled-name='nvlist_lookup_uint32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint32'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='90421557' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int64' mangled-name='nvlist_lookup_int64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int64'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='cb785ebf' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint64' mangled-name='nvlist_lookup_uint64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint64'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='5d6479ae' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_double' mangled-name='nvlist_lookup_double' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_double'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='7408d286' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_string' mangled-name='nvlist_lookup_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_string'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='9b23c9ad' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_nvlist' mangled-name='nvlist_lookup_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_nvlist'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='857bb57e' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_boolean_array' mangled-name='nvlist_lookup_boolean_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_boolean_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='03829398' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_byte_array' mangled-name='nvlist_lookup_byte_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_byte_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='3b0247c7' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int8_array' mangled-name='nvlist_lookup_int8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int8_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='ee181ab9' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint8_array' mangled-name='nvlist_lookup_uint8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint8_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='d8774064' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int16_array' mangled-name='nvlist_lookup_int16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int16_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='7e73928e' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint16_array' mangled-name='nvlist_lookup_uint16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint16_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='bd8768d9' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int32_array' mangled-name='nvlist_lookup_int32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int32_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='9aa04798' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint32_array' mangled-name='nvlist_lookup_uint32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint32_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='9507d3c7' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int64_array' mangled-name='nvlist_lookup_int64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int64_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='e37ce48f' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint64_array' mangled-name='nvlist_lookup_uint64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint64_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='892b4acc' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_string_array' mangled-name='nvlist_lookup_string_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_string_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='c0563f85' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_nvlist_array' mangled-name='nvlist_lookup_nvlist_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_nvlist_array'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='75be733c' name='a'/>
	+ <parameter type-id='4dd26a40' name='n'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_hrtime' mangled-name='nvlist_lookup_hrtime' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_hrtime'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='e379e62d' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_pairs' mangled-name='nvlist_lookup_pairs' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_pairs'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='95e97e5e' name='flag'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_exists' mangled-name='nvlist_exists' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_exists'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_nvpair_embedded_index' mangled-name='nvlist_lookup_nvpair_embedded_index' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_nvpair_embedded_index'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='0b283d2e' name='ret'/>
	+ <parameter type-id='7292109c' name='ip'/>
	+ <parameter type-id='9b23c9ad' name='ep'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
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	- <parameter type-id='type-id-12' name='ai' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='1274' column='1'/>
	- <parameter type-id='type-id-45' name='value' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='1274' column='1'/>
	- <parameter type-id='type-id-132' name='ep' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='1274' column='1'/>
	- <return type-id='type-id-12'/>
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	- <function-decl name='dump_nvlist' mangled-name='dump_nvlist' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='794' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='dump_nvlist'>
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	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='766' column='1'/>
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	- <function-decl name='nvlist_print' mangled-name='nvlist_print' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='757' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_print'>
	- <parameter type-id='type-id-39' name='fp' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='757' column='1'/>
	- <parameter type-id='type-id-219' name='nvl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='757' column='1'/>
	- <return type-id='type-id-21'/>
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	- <function-decl name='nvlist_prtctl_free' mangled-name='nvlist_prtctl_free' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='546' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_free'>
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	- <return type-id='type-id-21'/>
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	- <function-decl name='nvlist_prtctl_alloc' mangled-name='nvlist_prtctl_alloc' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='527' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_alloc'>
	- <return type-id='type-id-37'/>
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	- <parameter type-id='type-id-182' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='467' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='467' column='1'/>
	- <return type-id='type-id-21'/>
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	- <function-decl name='nvlist_prtctlop_string_array' mangled-name='nvlist_prtctlop_string_array' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='466' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_string_array'>
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	- <parameter type-id='type-id-166' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='466' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='466' column='1'/>
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	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='465' column='1'/>
	- <parameter type-id='type-id-212' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='465' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='465' column='1'/>
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	- <parameter type-id='type-id-176' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='464' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='464' column='1'/>
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	- <parameter type-id='type-id-206' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='457' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='457' column='1'/>
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	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='456' column='1'/>
	- <parameter type-id='type-id-162' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='456' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='456' column='1'/>
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	- <function-decl name='nvlist_prtctlop_nvlist' mangled-name='nvlist_prtctlop_nvlist' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='444' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_nvlist'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='444' column='1'/>
	- <parameter type-id='type-id-180' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='444' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='444' column='1'/>
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	- <function-decl name='nvlist_prtctlop_hrtime' mangled-name='nvlist_prtctlop_hrtime' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='443' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_hrtime'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='443' column='1'/>
	- <parameter type-id='type-id-186' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='443' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='443' column='1'/>
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	- <function-decl name='nvlist_prtctlop_string' mangled-name='nvlist_prtctlop_string' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='442' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_string'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='442' column='1'/>
	- <parameter type-id='type-id-164' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='442' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='442' column='1'/>
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	- <function-decl name='nvlist_prtctlop_double' mangled-name='nvlist_prtctlop_double' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='441' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_double'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='441' column='1'/>
	- <parameter type-id='type-id-168' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='441' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='441' column='1'/>
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	- <function-decl name='nvlist_prtctlop_uint64' mangled-name='nvlist_prtctlop_uint64' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='440' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint64'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='440' column='1'/>
	- <parameter type-id='type-id-202' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='440' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='440' column='1'/>
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	- <function-decl name='nvlist_prtctlop_int64' mangled-name='nvlist_prtctlop_int64' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='439' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int64'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='439' column='1'/>
	- <parameter type-id='type-id-192' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='439' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='439' column='1'/>
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	- <function-decl name='nvlist_prtctlop_uint32' mangled-name='nvlist_prtctlop_uint32' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='438' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint32'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='438' column='1'/>
	- <parameter type-id='type-id-200' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='438' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='438' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctlop_int32' mangled-name='nvlist_prtctlop_int32' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='437' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int32'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='437' column='1'/>
	- <parameter type-id='type-id-190' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='437' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='437' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctlop_uint16' mangled-name='nvlist_prtctlop_uint16' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='436' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint16'>
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	- <parameter type-id='type-id-198' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='436' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='436' column='1'/>
	- <return type-id='type-id-21'/>
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	- <function-decl name='nvlist_prtctlop_int16' mangled-name='nvlist_prtctlop_int16' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='435' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int16'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='435' column='1'/>
	- <parameter type-id='type-id-188' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='435' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='435' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctlop_uint8' mangled-name='nvlist_prtctlop_uint8' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='434' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint8'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='434' column='1'/>
	- <parameter type-id='type-id-204' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='434' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='434' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctlop_int8' mangled-name='nvlist_prtctlop_int8' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='433' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int8'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='433' column='1'/>
	- <parameter type-id='type-id-194' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='433' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='433' column='1'/>
	- <return type-id='type-id-21'/>
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	- <function-decl name='nvlist_prtctlop_byte' mangled-name='nvlist_prtctlop_byte' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='432' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_byte'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='432' column='1'/>
	- <parameter type-id='type-id-196' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='432' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='432' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctlop_boolean_value' mangled-name='nvlist_prtctlop_boolean_value' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='431' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_boolean_value'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='431' column='1'/>
	- <parameter type-id='type-id-184' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='431' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='431' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctlop_boolean' mangled-name='nvlist_prtctlop_boolean' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='430' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_boolean'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='430' column='1'/>
	- <parameter type-id='type-id-170' name='func' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='430' column='1'/>
	- <parameter type-id='type-id-53' name='private' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='430' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctl_dofmt' mangled-name='nvlist_prtctl_dofmt' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='383' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_dofmt'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='383' column='1'/>
	- <parameter type-id='type-id-124' name='which' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='383' column='1'/>
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	+ <pointer-type-def type-id='48b5725f' size-in-bits='64' id='eaa32e2f'/>
	+ <function-decl name='nvlist_prtctl_setdest' mangled-name='nvlist_prtctl_setdest' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_setdest'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='822cd80b' name='fp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctl_getdest' mangled-name='nvlist_prtctl_getdest' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_getdest'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <return type-id='822cd80b'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctl_setindent' mangled-name='nvlist_prtctl_setindent' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_setindent'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='628aafab' name='mode'/>
	+ <parameter type-id='95e97e5e' name='start'/>
	+ <parameter type-id='95e97e5e' name='inc'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctl_doindent' mangled-name='nvlist_prtctl_doindent' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_doindent'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='95e97e5e' name='onemore'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctl_setfmt' mangled-name='nvlist_prtctl_setfmt' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_setfmt'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='c8dcc53a' name='which'/>
	+ <parameter type-id='80f4b756' name='fmt'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctl_dofmt' mangled-name='nvlist_prtctl_dofmt' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_dofmt'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='c8dcc53a' name='which'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_boolean' mangled-name='nvlist_prtctlop_boolean' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_boolean'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='1263777a' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_boolean_value' mangled-name='nvlist_prtctlop_boolean_value' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_boolean_value'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='976f721b' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_byte' mangled-name='nvlist_prtctlop_byte' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_byte'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='519bf35c' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_int8' mangled-name='nvlist_prtctlop_int8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int8'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='a91bad5a' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_uint8' mangled-name='nvlist_prtctlop_uint8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint8'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='eb944897' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_int16' mangled-name='nvlist_prtctlop_int16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int16'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='957d9f35' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_uint16' mangled-name='nvlist_prtctlop_uint16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint16'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='92988dea' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_int32' mangled-name='nvlist_prtctlop_int32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int32'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='4db8acf3' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_uint32' mangled-name='nvlist_prtctlop_uint32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint32'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='7f8ee7e4' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_int64' mangled-name='nvlist_prtctlop_int64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int64'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='0ca7b13c' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_uint64' mangled-name='nvlist_prtctlop_uint64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint64'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='2c8c4457' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_double' mangled-name='nvlist_prtctlop_double' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_double'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='e44553b6' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_string' mangled-name='nvlist_prtctlop_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_string'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='2809de35' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_hrtime' mangled-name='nvlist_prtctlop_hrtime' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_hrtime'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='ee62ad8e' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_nvlist' mangled-name='nvlist_prtctlop_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_nvlist'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='001d8764' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_boolean_array' mangled-name='nvlist_prtctlop_boolean_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_boolean_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='ed8aa8ba' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_byte_array' mangled-name='nvlist_prtctlop_byte_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_byte_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='108e6453' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_int8_array' mangled-name='nvlist_prtctlop_int8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int8_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='f9668a57' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_uint8_array' mangled-name='nvlist_prtctlop_uint8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint8_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='eddda806' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_int16_array' mangled-name='nvlist_prtctlop_int16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int16_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='cbda43ac' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_uint16_array' mangled-name='nvlist_prtctlop_uint16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint16_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='5cbe16ab' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_int32_array' mangled-name='nvlist_prtctlop_int32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int32_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='b3fae562' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_uint32_array' mangled-name='nvlist_prtctlop_uint32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint32_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='d94cdfa1' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_int64_array' mangled-name='nvlist_prtctlop_int64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_int64_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='8b41e457' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_uint64_array' mangled-name='nvlist_prtctlop_uint64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_uint64_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='470a7fd4' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_string_array' mangled-name='nvlist_prtctlop_string_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_string_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='90d5edb9' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctlop_nvlist_array' mangled-name='nvlist_prtctlop_nvlist_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctlop_nvlist_array'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <parameter type-id='44f188f2' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctl_alloc' mangled-name='nvlist_prtctl_alloc' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_alloc'>
	+ <return type-id='b0c1ff8d'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prtctl_free' mangled-name='nvlist_prtctl_free' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_free'>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_print' mangled-name='nvlist_print' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_print'>
	+ <parameter type-id='822cd80b' name='fp'/>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_prt' mangled-name='nvlist_prt' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prt'>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <parameter type-id='b0c1ff8d' name='pctl'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='dump_nvlist' mangled-name='dump_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='dump_nvlist'>
	+ <parameter type-id='5ce45b60' name='list'/>
	+ <parameter type-id='95e97e5e' name='indent'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_match_regex' mangled-name='nvpair_value_match_regex' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_match_regex'>
	+ <parameter type-id='3fa542f0' name='nvp'/>
	+ <parameter type-id='95e97e5e' name='ai'/>
	+ <parameter type-id='26a90f95' name='value'/>
	+ <parameter type-id='d33f11cb' name='value_regex'/>
	+ <parameter type-id='9b23c9ad' name='ep'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_match' mangled-name='nvpair_value_match' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_match'>
	+ <parameter type-id='3fa542f0' name='nvp'/>
	+ <parameter type-id='95e97e5e' name='ai'/>
	+ <parameter type-id='26a90f95' name='value'/>
	+ <parameter type-id='9b23c9ad' name='ep'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='80f4b756'/>
	<parameter is-variadic='yes'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctl_setfmt' mangled-name='nvlist_prtctl_setfmt' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='350' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_setfmt'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='350' column='1'/>
	- <parameter type-id='type-id-124' name='which' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='350' column='1'/>
	- <parameter type-id='type-id-41' name='fmt' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='351' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctl_doindent' mangled-name='nvlist_prtctl_doindent' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='343' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_doindent'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='343' column='1'/>
	- <parameter type-id='type-id-12' name='onemore' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='343' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctl_setindent' mangled-name='nvlist_prtctl_setindent' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='325' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_setindent'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='325' column='1'/>
	- <parameter type-id='type-id-40' name='mode' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='325' column='1'/>
	- <parameter type-id='type-id-12' name='start' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='326' column='1'/>
	- <parameter type-id='type-id-12' name='inc' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='326' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctl_getdest' mangled-name='nvlist_prtctl_getdest' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='318' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_getdest'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='318' column='1'/>
	- <return type-id='type-id-39'/>
	- </function-decl>
	- <function-decl name='nvlist_prtctl_setdest' mangled-name='nvlist_prtctl_setdest' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='312' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prtctl_setdest'>
	- <parameter type-id='type-id-37' name='pctl' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='312' column='1'/>
	- <parameter type-id='type-id-39' name='fp' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='312' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvpair_value_match_regex' mangled-name='nvpair_value_match_regex' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='949' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_match_regex'>
	- <parameter type-id='type-id-221' name='nvp' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='949' column='1'/>
	- <parameter type-id='type-id-12' name='ai' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='949' column='1'/>
	- <parameter type-id='type-id-45' name='value' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='950' column='1'/>
	- <parameter type-id='type-id-222' name='value_regex' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='950' column='1'/>
	- <parameter type-id='type-id-132' name='ep' filepath='/home/fedora/zfs/lib/libnvpair/libnvpair.c' line='950' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='__builtin_fputs' mangled-name='fputs' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='__builtin_strchr' mangled-name='strchr' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='__builtin_fputc' mangled-name='fputc' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-type size-in-bits='64' id='type-id-134'>
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	- <parameter type-id='type-id-112'/>
	- <return type-id='type-id-12'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_nvlist_array' mangled-name='nvpair_value_nvlist_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_nvlist_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='75be733c'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_double' mangled-name='nvpair_value_double' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_double'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='7408d286'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint8_array' mangled-name='nvpair_value_uint8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint8_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='d8774064'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_int8_array' mangled-name='nvpair_value_int8_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int8_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='ee181ab9'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_boolean_array' mangled-name='nvpair_value_boolean_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_boolean_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='03829398'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint8' mangled-name='nvpair_value_uint8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint8'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='ae3e8ca6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_int8' mangled-name='nvpair_value_int8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int8'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='256d5229'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_boolean_value' mangled-name='nvpair_value_boolean_value' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_boolean_value'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='37e3bd22'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_nvlist' mangled-name='nvpair_value_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_nvlist'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_hrtime' mangled-name='nvpair_value_hrtime' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_hrtime'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='e379e62d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_string_array' mangled-name='nvpair_value_string_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_string_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='c0563f85'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint64_array' mangled-name='nvpair_value_uint64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint64_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='892b4acc'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_int64_array' mangled-name='nvpair_value_int64_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int64_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='e37ce48f'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint32_array' mangled-name='nvpair_value_uint32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint32_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='9507d3c7'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_int32_array' mangled-name='nvpair_value_int32_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int32_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='9aa04798'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint16_array' mangled-name='nvpair_value_uint16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint16_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='bd8768d9'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_int16_array' mangled-name='nvpair_value_int16_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int16_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='7e73928e'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_byte_array' mangled-name='nvpair_value_byte_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_byte_array'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='3b0247c7'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_string' mangled-name='nvpair_value_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_string'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint64' mangled-name='nvpair_value_uint64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint64'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='5d6479ae'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_int64' mangled-name='nvpair_value_int64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int64'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='cb785ebf'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint32' mangled-name='nvpair_value_uint32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint32'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='90421557'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_int32' mangled-name='nvpair_value_int32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int32'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='4aafb922'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint16' mangled-name='nvpair_value_uint16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint16'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='8a121f49'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_int16' mangled-name='nvpair_value_int16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int16'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='f76f73d0'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_byte' mangled-name='nvpair_value_byte' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_byte'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='45b65157'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_type' mangled-name='nvpair_type' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_type'>
	+ <parameter type-id='3fa542f0'/>
	+ <return type-id='8d0687d2'/>
	+ </function-decl>
	+ <function-decl name='nvpair_name' mangled-name='nvpair_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_name'>
	+ <parameter type-id='3fa542f0'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='nvlist_next_nvpair' mangled-name='nvlist_next_nvpair' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_next_nvpair'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='3fa542f0'/>
	+ <return type-id='3fa542f0'/>
	+ </function-decl>
	+ <function-decl name='malloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
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	+ <function-decl name='free' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='printf' visibility='default' binding='global' size-in-bits='64'>
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	+ <function-decl name='nvpair_type_is_array' mangled-name='nvpair_type_is_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_type_is_array'>
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	+ <var-decl name='nv_alloc_sleep_def' type-id='cca08635' mangled-name='nv_alloc_sleep_def' visibility='default' elf-symbol-id='nv_alloc_sleep_def'/>
	+ <var-decl name='nv_alloc_nosleep_def' type-id='cca08635' mangled-name='nv_alloc_nosleep_def' visibility='default' elf-symbol-id='nv_alloc_nosleep_def'/>
	+ <var-decl name='nv_alloc_sleep' type-id='11871392' mangled-name='nv_alloc_sleep' visibility='default' elf-symbol-id='nv_alloc_sleep'/>
	+ <function-type size-in-bits='64' id='e9ff7293'>
	+ <parameter type-id='11871392'/>
	+ <parameter type-id='b7f2d5e6'/>
	+ <return type-id='95e97e5e'/>
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	+ <function-type size-in-bits='64' id='1169c032'>
	+ <parameter type-id='11871392'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='48b5725f'/>
	+ </function-type>
	+ <function-type size-in-bits='64' id='9fff962e'>
	+ <parameter type-id='11871392'/>
	+ <parameter type-id='b59d7dce'/>
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	- <abi-instr version='1.0' address-size='64' path='../../module/nvpair/nvpair_alloc_fixed.c' comp-dir-path='/home/fedora/zfs/lib/libnvpair' language='LANG_C99'>
	- <var-decl name='nv_fixed_ops_def' type-id='type-id-239' mangled-name='nv_fixed_ops_def' visibility='default' filepath='../../module/nvpair/nvpair_alloc_fixed.c' line='103' column='1' elf-symbol-id='nv_fixed_ops_def'/>
	- <var-decl name='nv_fixed_ops' type-id='type-id-230' mangled-name='nv_fixed_ops' visibility='default' filepath='../../include/sys/nvpair.h' line='138' column='1' elf-symbol-id='nv_fixed_ops'/>
	- </abi-instr>
	- <abi-instr version='1.0' address-size='64' path='../../module/nvpair/nvpair.c' comp-dir-path='/home/fedora/zfs/lib/libnvpair' language='LANG_C99'>
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	- <var-decl name='nvlist_hashtable_init_size' type-id='type-id-33' mangled-name='nvlist_hashtable_init_size' visibility='default' filepath='../../module/nvpair/nvpair.c' line='154' column='1' elf-symbol-id='nvlist_hashtable_init_size'/>
	- <function-decl name='nvlist_xunpack' mangled-name='nvlist_xunpack' filepath='../../module/nvpair/nvpair.c' line='2721' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_xunpack'>
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	- <parameter type-id='type-id-220' name='nvlp' filepath='../../module/nvpair/nvpair.c' line='2721' column='1'/>
	- <parameter type-id='type-id-241' name='nva' filepath='../../module/nvpair/nvpair.c' line='2721' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_unpack' mangled-name='nvlist_unpack' filepath='../../module/nvpair/nvpair.c' line='2715' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_unpack'>
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	- <parameter type-id='type-id-12' name='kmflag' filepath='../../module/nvpair/nvpair.c' line='2715' column='1'/>
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	- <return type-id='type-id-12'/>
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	- <function-decl name='nvlist_size' mangled-name='nvlist_size' filepath='../../module/nvpair/nvpair.c' line='2648' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_size'>
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	- <function-decl name='nvlist_add_nvpair' mangled-name='nvlist_add_nvpair' filepath='../../module/nvpair/nvpair.c' line='2262' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_nvpair'>
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	- </function-decl>
	- <function-decl name='nvpair_value_nvlist_array' mangled-name='nvpair_value_nvlist_array' filepath='../../module/nvpair/nvpair.c' line='2247' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_nvlist_array'>
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	- <parameter type-id='type-id-264' name='nelem' filepath='../../module/nvpair/nvpair.c' line='2247' column='1'/>
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	- <function-decl name='nvpair_value_string_array' mangled-name='nvpair_value_string_array' filepath='../../module/nvpair/nvpair.c' line='2241' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_string_array'>
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	- <function-decl name='nvpair_value_uint64_array' mangled-name='nvpair_value_uint64_array' filepath='../../module/nvpair/nvpair.c' line='2235' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint64_array'>
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	- <return type-id='type-id-12'/>
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	- <function-decl name='nvpair_value_int16_array' mangled-name='nvpair_value_int16_array' filepath='../../module/nvpair/nvpair.c' line='2205' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int16_array'>
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	- <return type-id='type-id-12'/>
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	- <return type-id='type-id-12'/>
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	- <function-decl name='nvpair_value_int8_array' mangled-name='nvpair_value_int8_array' filepath='../../module/nvpair/nvpair.c' line='2193' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int8_array'>
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	- <function-decl name='nvpair_value_byte_array' mangled-name='nvpair_value_byte_array' filepath='../../module/nvpair/nvpair.c' line='2187' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_byte_array'>
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	- <function-decl name='nvpair_value_double' mangled-name='nvpair_value_double' filepath='../../module/nvpair/nvpair.c' line='2162' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_double'>
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	- <return type-id='type-id-12'/>
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	- <function-decl name='nvpair_value_uint64' mangled-name='nvpair_value_uint64' filepath='../../module/nvpair/nvpair.c' line='2155' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint64'>
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	- <function-decl name='nvpair_value_int64' mangled-name='nvpair_value_int64' filepath='../../module/nvpair/nvpair.c' line='2149' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int64'>
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	- <parameter type-id='type-id-217' name='val' filepath='../../module/nvpair/nvpair.c' line='2149' column='1'/>
	- <return type-id='type-id-12'/>
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	- <function-decl name='nvpair_value_uint32' mangled-name='nvpair_value_uint32' filepath='../../module/nvpair/nvpair.c' line='2143' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint32'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='2143' column='1'/>
	- <parameter type-id='type-id-225' name='val' filepath='../../module/nvpair/nvpair.c' line='2143' column='1'/>
	- <return type-id='type-id-12'/>
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	- <function-decl name='nvpair_value_int32' mangled-name='nvpair_value_int32' filepath='../../module/nvpair/nvpair.c' line='2137' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int32'>
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	- <parameter type-id='type-id-216' name='val' filepath='../../module/nvpair/nvpair.c' line='2137' column='1'/>
	- <return type-id='type-id-12'/>
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	- <function-decl name='nvpair_value_uint16' mangled-name='nvpair_value_uint16' filepath='../../module/nvpair/nvpair.c' line='2131' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint16'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='2131' column='1'/>
	- <parameter type-id='type-id-224' name='val' filepath='../../module/nvpair/nvpair.c' line='2131' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvpair_value_int16' mangled-name='nvpair_value_int16' filepath='../../module/nvpair/nvpair.c' line='2125' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int16'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='2125' column='1'/>
	- <parameter type-id='type-id-215' name='val' filepath='../../module/nvpair/nvpair.c' line='2125' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvpair_value_uint8' mangled-name='nvpair_value_uint8' filepath='../../module/nvpair/nvpair.c' line='2119' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_uint8'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='2119' column='1'/>
	- <parameter type-id='type-id-227' name='val' filepath='../../module/nvpair/nvpair.c' line='2119' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvpair_value_int8' mangled-name='nvpair_value_int8' filepath='../../module/nvpair/nvpair.c' line='2113' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_int8'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='2113' column='1'/>
	- <parameter type-id='type-id-218' name='val' filepath='../../module/nvpair/nvpair.c' line='2113' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvpair_value_byte' mangled-name='nvpair_value_byte' filepath='../../module/nvpair/nvpair.c' line='2107' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_byte'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='2107' column='1'/>
	- <parameter type-id='type-id-223' name='val' filepath='../../module/nvpair/nvpair.c' line='2107' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvpair_value_boolean_value' mangled-name='nvpair_value_boolean_value' filepath='../../module/nvpair/nvpair.c' line='2101' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_value_boolean_value'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='2101' column='1'/>
	- <parameter type-id='type-id-131' name='val' filepath='../../module/nvpair/nvpair.c' line='2101' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_exists' mangled-name='nvlist_exists' filepath='../../module/nvpair/nvpair.c' line='2080' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_exists'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='2080' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='2080' column='1'/>
	- <return type-id='type-id-87'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_nvpair_embedded_index' mangled-name='nvlist_lookup_nvpair_embedded_index' filepath='../../module/nvpair/nvpair.c' line='2073' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_nvpair_embedded_index'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='2073' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='2074' column='1'/>
	- <parameter type-id='type-id-257' name='ret' filepath='../../module/nvpair/nvpair.c' line='2074' column='1'/>
	- <parameter type-id='type-id-251' name='ip' filepath='../../module/nvpair/nvpair.c' line='2074' column='1'/>
	- <parameter type-id='type-id-132' name='ep' filepath='../../module/nvpair/nvpair.c' line='2074' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_nvpair' mangled-name='nvlist_lookup_nvpair' filepath='../../module/nvpair/nvpair.c' line='2063' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_nvpair'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='2063' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='2063' column='1'/>
	- <parameter type-id='type-id-257' name='ret' filepath='../../module/nvpair/nvpair.c' line='2063' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_pairs' mangled-name='nvlist_lookup_pairs' filepath='../../module/nvpair/nvpair.c' line='1813' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_pairs'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1813' column='1'/>
	- <parameter type-id='type-id-12' name='flag' filepath='../../module/nvpair/nvpair.c' line='1813' column='1'/>
	- <parameter is-variadic='yes'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_hrtime' mangled-name='nvlist_lookup_hrtime' filepath='../../module/nvpair/nvpair.c' line='1807' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_hrtime'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1807' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1807' column='1'/>
	- <parameter type-id='type-id-250' name='val' filepath='../../module/nvpair/nvpair.c' line='1807' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_nvlist_array' mangled-name='nvlist_lookup_nvlist_array' filepath='../../module/nvpair/nvpair.c' line='1800' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_nvlist_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1800' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1800' column='1'/>
	- <parameter type-id='type-id-256' name='a' filepath='../../module/nvpair/nvpair.c' line='1801' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1801' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_string_array' mangled-name='nvlist_lookup_string_array' filepath='../../module/nvpair/nvpair.c' line='1793' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_string_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1793' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1793' column='1'/>
	- <parameter type-id='type-id-248' name='a' filepath='../../module/nvpair/nvpair.c' line='1794' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1794' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_uint64_array' mangled-name='nvlist_lookup_uint64_array' filepath='../../module/nvpair/nvpair.c' line='1786' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint64_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1786' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1786' column='1'/>
	- <parameter type-id='type-id-262' name='a' filepath='../../module/nvpair/nvpair.c' line='1787' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1787' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_int64_array' mangled-name='nvlist_lookup_int64_array' filepath='../../module/nvpair/nvpair.c' line='1779' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int64_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1779' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1779' column='1'/>
	- <parameter type-id='type-id-254' name='a' filepath='../../module/nvpair/nvpair.c' line='1780' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1780' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_uint32_array' mangled-name='nvlist_lookup_uint32_array' filepath='../../module/nvpair/nvpair.c' line='1772' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint32_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1772' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1772' column='1'/>
	- <parameter type-id='type-id-261' name='a' filepath='../../module/nvpair/nvpair.c' line='1773' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1773' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_int32_array' mangled-name='nvlist_lookup_int32_array' filepath='../../module/nvpair/nvpair.c' line='1765' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int32_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1765' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1765' column='1'/>
	- <parameter type-id='type-id-253' name='a' filepath='../../module/nvpair/nvpair.c' line='1766' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1766' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_uint16_array' mangled-name='nvlist_lookup_uint16_array' filepath='../../module/nvpair/nvpair.c' line='1758' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint16_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1758' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1758' column='1'/>
	- <parameter type-id='type-id-260' name='a' filepath='../../module/nvpair/nvpair.c' line='1759' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1759' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_int16_array' mangled-name='nvlist_lookup_int16_array' filepath='../../module/nvpair/nvpair.c' line='1751' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int16_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1751' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1751' column='1'/>
	- <parameter type-id='type-id-252' name='a' filepath='../../module/nvpair/nvpair.c' line='1752' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1752' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_uint8_array' mangled-name='nvlist_lookup_uint8_array' filepath='../../module/nvpair/nvpair.c' line='1744' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint8_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1744' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1744' column='1'/>
	- <parameter type-id='type-id-263' name='a' filepath='../../module/nvpair/nvpair.c' line='1745' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1745' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_int8_array' mangled-name='nvlist_lookup_int8_array' filepath='../../module/nvpair/nvpair.c' line='1738' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int8_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1738' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1738' column='1'/>
	- <parameter type-id='type-id-255' name='a' filepath='../../module/nvpair/nvpair.c' line='1738' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1738' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_byte_array' mangled-name='nvlist_lookup_byte_array' filepath='../../module/nvpair/nvpair.c' line='1731' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_byte_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1731' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1731' column='1'/>
	- <parameter type-id='type-id-259' name='a' filepath='../../module/nvpair/nvpair.c' line='1732' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1732' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_boolean_array' mangled-name='nvlist_lookup_boolean_array' filepath='../../module/nvpair/nvpair.c' line='1723' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_boolean_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1723' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1723' column='1'/>
	- <parameter type-id='type-id-245' name='a' filepath='../../module/nvpair/nvpair.c' line='1724' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/nvpair.c' line='1724' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_nvlist' mangled-name='nvlist_lookup_nvlist' filepath='../../module/nvpair/nvpair.c' line='1717' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_nvlist'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1717' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1717' column='1'/>
	- <parameter type-id='type-id-220' name='val' filepath='../../module/nvpair/nvpair.c' line='1717' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_string' mangled-name='nvlist_lookup_string' filepath='../../module/nvpair/nvpair.c' line='1711' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_string'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1711' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1711' column='1'/>
	- <parameter type-id='type-id-132' name='val' filepath='../../module/nvpair/nvpair.c' line='1711' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_double' mangled-name='nvlist_lookup_double' filepath='../../module/nvpair/nvpair.c' line='1704' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_double'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1704' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1704' column='1'/>
	- <parameter type-id='type-id-249' name='val' filepath='../../module/nvpair/nvpair.c' line='1704' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_uint64' mangled-name='nvlist_lookup_uint64' filepath='../../module/nvpair/nvpair.c' line='1697' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint64'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1697' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1697' column='1'/>
	- <parameter type-id='type-id-226' name='val' filepath='../../module/nvpair/nvpair.c' line='1697' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_int64' mangled-name='nvlist_lookup_int64' filepath='../../module/nvpair/nvpair.c' line='1691' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int64'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1691' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1691' column='1'/>
	- <parameter type-id='type-id-217' name='val' filepath='../../module/nvpair/nvpair.c' line='1691' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_uint32' mangled-name='nvlist_lookup_uint32' filepath='../../module/nvpair/nvpair.c' line='1685' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint32'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1685' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1685' column='1'/>
	- <parameter type-id='type-id-225' name='val' filepath='../../module/nvpair/nvpair.c' line='1685' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_int32' mangled-name='nvlist_lookup_int32' filepath='../../module/nvpair/nvpair.c' line='1679' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int32'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1679' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1679' column='1'/>
	- <parameter type-id='type-id-216' name='val' filepath='../../module/nvpair/nvpair.c' line='1679' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_uint16' mangled-name='nvlist_lookup_uint16' filepath='../../module/nvpair/nvpair.c' line='1673' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint16'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1673' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1673' column='1'/>
	- <parameter type-id='type-id-224' name='val' filepath='../../module/nvpair/nvpair.c' line='1673' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_int16' mangled-name='nvlist_lookup_int16' filepath='../../module/nvpair/nvpair.c' line='1667' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int16'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1667' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1667' column='1'/>
	- <parameter type-id='type-id-215' name='val' filepath='../../module/nvpair/nvpair.c' line='1667' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_uint8' mangled-name='nvlist_lookup_uint8' filepath='../../module/nvpair/nvpair.c' line='1661' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_uint8'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1661' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1661' column='1'/>
	- <parameter type-id='type-id-227' name='val' filepath='../../module/nvpair/nvpair.c' line='1661' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_int8' mangled-name='nvlist_lookup_int8' filepath='../../module/nvpair/nvpair.c' line='1655' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_int8'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1655' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1655' column='1'/>
	- <parameter type-id='type-id-218' name='val' filepath='../../module/nvpair/nvpair.c' line='1655' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_byte' mangled-name='nvlist_lookup_byte' filepath='../../module/nvpair/nvpair.c' line='1649' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_byte'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1649' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1649' column='1'/>
	- <parameter type-id='type-id-223' name='val' filepath='../../module/nvpair/nvpair.c' line='1649' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_boolean_value' mangled-name='nvlist_lookup_boolean_value' filepath='../../module/nvpair/nvpair.c' line='1642' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_boolean_value'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1642' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1642' column='1'/>
	- <parameter type-id='type-id-131' name='val' filepath='../../module/nvpair/nvpair.c' line='1642' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_boolean' mangled-name='nvlist_lookup_boolean' filepath='../../module/nvpair/nvpair.c' line='1636' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_boolean'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1636' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1636' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvpair_type_is_array' mangled-name='nvpair_type_is_array' filepath='../../module/nvpair/nvpair.c' line='1520' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_type_is_array'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='1520' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvpair_type' mangled-name='nvpair_type' filepath='../../module/nvpair/nvpair.c' line='1514' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_type'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='1514' column='1'/>
	- <return type-id='type-id-26'/>
	- </function-decl>
	- <function-decl name='nvpair_name' mangled-name='nvpair_name' filepath='../../module/nvpair/nvpair.c' line='1508' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvpair_name'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='1508' column='1'/>
	- <return type-id='type-id-45'/>
	- </function-decl>
	- <function-decl name='nvlist_empty' mangled-name='nvlist_empty' filepath='../../module/nvpair/nvpair.c' line='1496' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_empty'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1496' column='1'/>
	- <return type-id='type-id-87'/>
	- </function-decl>
	- <function-decl name='nvlist_prev_nvpair' mangled-name='nvlist_prev_nvpair' filepath='../../module/nvpair/nvpair.c' line='1472' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_prev_nvpair'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1472' column='1'/>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='1472' column='1'/>
	- <return type-id='type-id-221'/>
	- </function-decl>
	- <function-decl name='nvlist_next_nvpair' mangled-name='nvlist_next_nvpair' filepath='../../module/nvpair/nvpair.c' line='1443' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_next_nvpair'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1443' column='1'/>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='1443' column='1'/>
	- <return type-id='type-id-221'/>
	- </function-decl>
	- <function-decl name='nvlist_add_nvlist_array' mangled-name='nvlist_add_nvlist_array' filepath='../../module/nvpair/nvpair.c' line='1436' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_nvlist_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1436' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1436' column='1'/>
	- <parameter type-id='type-id-220' name='a' filepath='../../module/nvpair/nvpair.c' line='1436' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1436' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_nvlist' mangled-name='nvlist_add_nvlist' filepath='../../module/nvpair/nvpair.c' line='1430' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_nvlist'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1430' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1430' column='1'/>
	- <parameter type-id='type-id-219' name='val' filepath='../../module/nvpair/nvpair.c' line='1430' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_hrtime' mangled-name='nvlist_add_hrtime' filepath='../../module/nvpair/nvpair.c' line='1424' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_hrtime'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1424' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1424' column='1'/>
	- <parameter type-id='type-id-109' name='val' filepath='../../module/nvpair/nvpair.c' line='1424' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_string_array' mangled-name='nvlist_add_string_array' filepath='../../module/nvpair/nvpair.c' line='1417' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_string_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1417' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1417' column='1'/>
	- <parameter type-id='type-id-247' name='a' filepath='../../module/nvpair/nvpair.c' line='1418' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1418' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_uint64_array' mangled-name='nvlist_add_uint64_array' filepath='../../module/nvpair/nvpair.c' line='1411' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint64_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1411' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1411' column='1'/>
	- <parameter type-id='type-id-226' name='a' filepath='../../module/nvpair/nvpair.c' line='1411' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1411' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_int64_array' mangled-name='nvlist_add_int64_array' filepath='../../module/nvpair/nvpair.c' line='1405' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int64_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1405' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1405' column='1'/>
	- <parameter type-id='type-id-217' name='a' filepath='../../module/nvpair/nvpair.c' line='1405' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1405' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_uint32_array' mangled-name='nvlist_add_uint32_array' filepath='../../module/nvpair/nvpair.c' line='1399' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint32_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1399' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1399' column='1'/>
	- <parameter type-id='type-id-225' name='a' filepath='../../module/nvpair/nvpair.c' line='1399' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1399' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_int32_array' mangled-name='nvlist_add_int32_array' filepath='../../module/nvpair/nvpair.c' line='1393' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int32_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1393' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1393' column='1'/>
	- <parameter type-id='type-id-216' name='a' filepath='../../module/nvpair/nvpair.c' line='1393' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1393' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_uint16_array' mangled-name='nvlist_add_uint16_array' filepath='../../module/nvpair/nvpair.c' line='1387' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint16_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1387' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1387' column='1'/>
	- <parameter type-id='type-id-224' name='a' filepath='../../module/nvpair/nvpair.c' line='1387' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1387' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_int16_array' mangled-name='nvlist_add_int16_array' filepath='../../module/nvpair/nvpair.c' line='1381' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int16_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1381' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1381' column='1'/>
	- <parameter type-id='type-id-215' name='a' filepath='../../module/nvpair/nvpair.c' line='1381' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1381' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_uint8_array' mangled-name='nvlist_add_uint8_array' filepath='../../module/nvpair/nvpair.c' line='1375' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint8_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1375' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1375' column='1'/>
	- <parameter type-id='type-id-227' name='a' filepath='../../module/nvpair/nvpair.c' line='1375' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1375' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_int8_array' mangled-name='nvlist_add_int8_array' filepath='../../module/nvpair/nvpair.c' line='1369' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int8_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1369' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1369' column='1'/>
	- <parameter type-id='type-id-218' name='a' filepath='../../module/nvpair/nvpair.c' line='1369' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1369' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_byte_array' mangled-name='nvlist_add_byte_array' filepath='../../module/nvpair/nvpair.c' line='1363' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_byte_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1363' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1363' column='1'/>
	- <parameter type-id='type-id-223' name='a' filepath='../../module/nvpair/nvpair.c' line='1363' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1363' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_boolean_array' mangled-name='nvlist_add_boolean_array' filepath='../../module/nvpair/nvpair.c' line='1356' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_boolean_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1356' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1356' column='1'/>
	- <parameter type-id='type-id-131' name='a' filepath='../../module/nvpair/nvpair.c' line='1357' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/nvpair.c' line='1357' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_string' mangled-name='nvlist_add_string' filepath='../../module/nvpair/nvpair.c' line='1350' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_string'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1350' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1350' column='1'/>
	- <parameter type-id='type-id-41' name='val' filepath='../../module/nvpair/nvpair.c' line='1350' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_double' mangled-name='nvlist_add_double' filepath='../../module/nvpair/nvpair.c' line='1343' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_double'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1343' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1343' column='1'/>
	- <parameter type-id='type-id-11' name='val' filepath='../../module/nvpair/nvpair.c' line='1343' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_uint64' mangled-name='nvlist_add_uint64' filepath='../../module/nvpair/nvpair.c' line='1336' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint64'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1336' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1336' column='1'/>
	- <parameter type-id='type-id-33' name='val' filepath='../../module/nvpair/nvpair.c' line='1336' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_int64' mangled-name='nvlist_add_int64' filepath='../../module/nvpair/nvpair.c' line='1330' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int64'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1330' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1330' column='1'/>
	- <parameter type-id='type-id-104' name='val' filepath='../../module/nvpair/nvpair.c' line='1330' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_uint32' mangled-name='nvlist_add_uint32' filepath='../../module/nvpair/nvpair.c' line='1324' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint32'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1324' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1324' column='1'/>
	- <parameter type-id='type-id-32' name='val' filepath='../../module/nvpair/nvpair.c' line='1324' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_int32' mangled-name='nvlist_add_int32' filepath='../../module/nvpair/nvpair.c' line='1318' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int32'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1318' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1318' column='1'/>
	- <parameter type-id='type-id-24' name='val' filepath='../../module/nvpair/nvpair.c' line='1318' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_uint16' mangled-name='nvlist_add_uint16' filepath='../../module/nvpair/nvpair.c' line='1312' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint16'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1312' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1312' column='1'/>
	- <parameter type-id='type-id-99' name='val' filepath='../../module/nvpair/nvpair.c' line='1312' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_int16' mangled-name='nvlist_add_int16' filepath='../../module/nvpair/nvpair.c' line='1306' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int16'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1306' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1306' column='1'/>
	- <parameter type-id='type-id-25' name='val' filepath='../../module/nvpair/nvpair.c' line='1306' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_uint8' mangled-name='nvlist_add_uint8' filepath='../../module/nvpair/nvpair.c' line='1300' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_uint8'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1300' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1300' column='1'/>
	- <parameter type-id='type-id-95' name='val' filepath='../../module/nvpair/nvpair.c' line='1300' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_int8' mangled-name='nvlist_add_int8' filepath='../../module/nvpair/nvpair.c' line='1294' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_int8'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1294' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1294' column='1'/>
	- <parameter type-id='type-id-92' name='val' filepath='../../module/nvpair/nvpair.c' line='1294' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_byte' mangled-name='nvlist_add_byte' filepath='../../module/nvpair/nvpair.c' line='1288' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_byte'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1288' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1288' column='1'/>
	- <parameter type-id='type-id-89' name='val' filepath='../../module/nvpair/nvpair.c' line='1288' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_boolean_value' mangled-name='nvlist_add_boolean_value' filepath='../../module/nvpair/nvpair.c' line='1282' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_boolean_value'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1282' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1282' column='1'/>
	- <parameter type-id='type-id-87' name='val' filepath='../../module/nvpair/nvpair.c' line='1282' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_add_boolean' mangled-name='nvlist_add_boolean' filepath='../../module/nvpair/nvpair.c' line='1276' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_add_boolean'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='1276' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='1276' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_dup' mangled-name='nvlist_dup' filepath='../../module/nvpair/nvpair.c' line='916' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_dup'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='916' column='1'/>
	- <parameter type-id='type-id-220' name='nvlp' filepath='../../module/nvpair/nvpair.c' line='916' column='1'/>
	- <parameter type-id='type-id-12' name='kmflag' filepath='../../module/nvpair/nvpair.c' line='916' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_free' mangled-name='nvlist_free' filepath='../../module/nvpair/nvpair.c' line='866' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_free'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='866' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nvlist_alloc' mangled-name='nvlist_alloc' filepath='../../module/nvpair/nvpair.c' line='585' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_alloc'>
	- <parameter type-id='type-id-220' name='nvlp' filepath='../../module/nvpair/nvpair.c' line='585' column='1'/>
	- <parameter type-id='type-id-112' name='nvflag' filepath='../../module/nvpair/nvpair.c' line='585' column='1'/>
	- <parameter type-id='type-id-12' name='kmflag' filepath='../../module/nvpair/nvpair.c' line='585' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_nvflag' mangled-name='nvlist_nvflag' filepath='../../module/nvpair/nvpair.c' line='559' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_nvflag'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='559' column='1'/>
	- <return type-id='type-id-112'/>
	- </function-decl>
	- <function-decl name='nvlist_lookup_nv_alloc' mangled-name='nvlist_lookup_nv_alloc' filepath='../../module/nvpair/nvpair.c' line='188' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_lookup_nv_alloc'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='188' column='1'/>
	- <return type-id='type-id-241'/>
	- </function-decl>
	- <function-decl name='nv_alloc_fini' mangled-name='nv_alloc_fini' filepath='../../module/nvpair/nvpair.c' line='181' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nv_alloc_fini'>
	- <parameter type-id='type-id-241' name='nva' filepath='../../module/nvpair/nvpair.c' line='181' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nv_alloc_reset' mangled-name='nv_alloc_reset' filepath='../../module/nvpair/nvpair.c' line='174' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nv_alloc_reset'>
	- <parameter type-id='type-id-241' name='nva' filepath='../../module/nvpair/nvpair.c' line='174' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='nv_alloc_init' mangled-name='nv_alloc_init' filepath='../../module/nvpair/nvpair.c' line='157' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nv_alloc_init'>
	- <parameter type-id='type-id-241' name='nva' filepath='../../module/nvpair/nvpair.c' line='157' column='1'/>
	- <parameter type-id='type-id-230' name='nvo' filepath='../../module/nvpair/nvpair.c' line='157' column='1'/>
	- <parameter is-variadic='yes'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_xalloc' mangled-name='nvlist_xalloc' filepath='../../module/nvpair/nvpair.c' line='591' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_xalloc'>
	- <parameter type-id='type-id-220' name='nvlp' filepath='../../module/nvpair/nvpair.c' line='591' column='1'/>
	- <parameter type-id='type-id-112' name='nvflag' filepath='../../module/nvpair/nvpair.c' line='591' column='1'/>
	- <parameter type-id='type-id-241' name='nva' filepath='../../module/nvpair/nvpair.c' line='591' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_remove_nvpair' mangled-name='nvlist_remove_nvpair' filepath='../../module/nvpair/nvpair.c' line='978' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_remove_nvpair'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='978' column='1'/>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/nvpair.c' line='978' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_remove_all' mangled-name='nvlist_remove_all' filepath='../../module/nvpair/nvpair.c' line='945' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_remove_all'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='945' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='945' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_remove' mangled-name='nvlist_remove' filepath='../../module/nvpair/nvpair.c' line='965' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_remove'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='965' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/nvpair.c' line='965' column='1'/>
	- <parameter type-id='type-id-26' name='type' filepath='../../module/nvpair/nvpair.c' line='965' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_xdup' mangled-name='nvlist_xdup' filepath='../../module/nvpair/nvpair.c' line='922' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_xdup'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='922' column='1'/>
	- <parameter type-id='type-id-220' name='nvlp' filepath='../../module/nvpair/nvpair.c' line='922' column='1'/>
	- <parameter type-id='type-id-241' name='nva' filepath='../../module/nvpair/nvpair.c' line='922' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='nvlist_xpack' mangled-name='nvlist_xpack' filepath='../../module/nvpair/nvpair.c' line='2665' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='nvlist_xpack'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/nvpair.c' line='2665' column='1'/>
	- <parameter type-id='type-id-132' name='bufp' filepath='../../module/nvpair/nvpair.c' line='2665' column='1'/>
	- <parameter type-id='type-id-258' name='buflen' filepath='../../module/nvpair/nvpair.c' line='2665' column='1'/>
	- <parameter type-id='type-id-12' name='encoding' filepath='../../module/nvpair/nvpair.c' line='2665' column='1'/>
	- <parameter type-id='type-id-241' name='nva' filepath='../../module/nvpair/nvpair.c' line='2666' column='1'/>
	- <return type-id='type-id-12'/>
	- </function-decl>
	- <function-decl name='__builtin_memset' mangled-name='memset' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='__builtin_memmove' mangled-name='memmove' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- </abi-instr>
	- <abi-instr version='1.0' address-size='64' path='../../module/nvpair/fnvpair.c' comp-dir-path='/home/fedora/zfs/lib/libnvpair' language='LANG_C99'>
	- <function-decl name='fnvpair_value_nvlist' mangled-name='fnvpair_value_nvlist' filepath='../../module/nvpair/fnvpair.c' line='583' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_nvlist'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='583' column='1'/>
	- <return type-id='type-id-219'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_string' mangled-name='fnvpair_value_string' filepath='../../module/nvpair/fnvpair.c' line='575' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_string'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='575' column='1'/>
	- <return type-id='type-id-45'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_uint64' mangled-name='fnvpair_value_uint64' filepath='../../module/nvpair/fnvpair.c' line='567' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_uint64'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='567' column='1'/>
	- <return type-id='type-id-33'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_uint32' mangled-name='fnvpair_value_uint32' filepath='../../module/nvpair/fnvpair.c' line='559' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_uint32'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='559' column='1'/>
	- <return type-id='type-id-32'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_uint16' mangled-name='fnvpair_value_uint16' filepath='../../module/nvpair/fnvpair.c' line='551' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_uint16'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='551' column='1'/>
	- <return type-id='type-id-99'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_uint8' mangled-name='fnvpair_value_uint8' filepath='../../module/nvpair/fnvpair.c' line='543' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_uint8'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='543' column='1'/>
	- <return type-id='type-id-95'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_int64' mangled-name='fnvpair_value_int64' filepath='../../module/nvpair/fnvpair.c' line='535' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_int64'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='535' column='1'/>
	- <return type-id='type-id-104'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_int32' mangled-name='fnvpair_value_int32' filepath='../../module/nvpair/fnvpair.c' line='527' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_int32'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='527' column='1'/>
	- <return type-id='type-id-24'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_int16' mangled-name='fnvpair_value_int16' filepath='../../module/nvpair/fnvpair.c' line='519' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_int16'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='519' column='1'/>
	- <return type-id='type-id-25'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_int8' mangled-name='fnvpair_value_int8' filepath='../../module/nvpair/fnvpair.c' line='511' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_int8'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='511' column='1'/>
	- <return type-id='type-id-92'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_byte' mangled-name='fnvpair_value_byte' filepath='../../module/nvpair/fnvpair.c' line='503' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_byte'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='503' column='1'/>
	- <return type-id='type-id-89'/>
	- </function-decl>
	- <function-decl name='fnvpair_value_boolean_value' mangled-name='fnvpair_value_boolean_value' filepath='../../module/nvpair/fnvpair.c' line='495' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvpair_value_boolean_value'>
	- <parameter type-id='type-id-221' name='nvp' filepath='../../module/nvpair/fnvpair.c' line='495' column='1'/>
	- <return type-id='type-id-87'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_uint64_array' mangled-name='fnvlist_lookup_uint64_array' filepath='../../module/nvpair/fnvpair.c' line='487' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint64_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='487' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='487' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='487' column='1'/>
	- <return type-id='type-id-226'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_int64_array' mangled-name='fnvlist_lookup_int64_array' filepath='../../module/nvpair/fnvpair.c' line='479' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int64_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='479' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='479' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='479' column='1'/>
	- <return type-id='type-id-217'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_uint32_array' mangled-name='fnvlist_lookup_uint32_array' filepath='../../module/nvpair/fnvpair.c' line='471' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint32_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='471' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='471' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='471' column='1'/>
	- <return type-id='type-id-225'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_int32_array' mangled-name='fnvlist_lookup_int32_array' filepath='../../module/nvpair/fnvpair.c' line='463' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int32_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='463' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='463' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='463' column='1'/>
	- <return type-id='type-id-216'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_uint16_array' mangled-name='fnvlist_lookup_uint16_array' filepath='../../module/nvpair/fnvpair.c' line='455' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint16_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='455' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='455' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='455' column='1'/>
	- <return type-id='type-id-224'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_int16_array' mangled-name='fnvlist_lookup_int16_array' filepath='../../module/nvpair/fnvpair.c' line='447' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int16_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='447' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='447' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='447' column='1'/>
	- <return type-id='type-id-215'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_uint8_array' mangled-name='fnvlist_lookup_uint8_array' filepath='../../module/nvpair/fnvpair.c' line='439' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint8_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='439' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='439' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='439' column='1'/>
	- <return type-id='type-id-227'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_int8_array' mangled-name='fnvlist_lookup_int8_array' filepath='../../module/nvpair/fnvpair.c' line='431' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int8_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='431' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='431' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='431' column='1'/>
	- <return type-id='type-id-218'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_byte_array' mangled-name='fnvlist_lookup_byte_array' filepath='../../module/nvpair/fnvpair.c' line='423' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_byte_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='423' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='423' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='423' column='1'/>
	- <return type-id='type-id-223'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_boolean_array' mangled-name='fnvlist_lookup_boolean_array' filepath='../../module/nvpair/fnvpair.c' line='415' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_boolean_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='415' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='415' column='1'/>
	- <parameter type-id='type-id-264' name='n' filepath='../../module/nvpair/fnvpair.c' line='415' column='1'/>
	- <return type-id='type-id-131'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_nvlist' mangled-name='fnvlist_lookup_nvlist' filepath='../../module/nvpair/fnvpair.c' line='408' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_nvlist'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='408' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='408' column='1'/>
	- <return type-id='type-id-219'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_string' mangled-name='fnvlist_lookup_string' filepath='../../module/nvpair/fnvpair.c' line='400' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_string'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='400' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='400' column='1'/>
	- <return type-id='type-id-45'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_uint64' mangled-name='fnvlist_lookup_uint64' filepath='../../module/nvpair/fnvpair.c' line='392' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint64'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='392' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='392' column='1'/>
	- <return type-id='type-id-33'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_uint32' mangled-name='fnvlist_lookup_uint32' filepath='../../module/nvpair/fnvpair.c' line='384' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint32'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='384' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='384' column='1'/>
	- <return type-id='type-id-32'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_uint16' mangled-name='fnvlist_lookup_uint16' filepath='../../module/nvpair/fnvpair.c' line='376' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint16'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='376' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='376' column='1'/>
	- <return type-id='type-id-99'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_uint8' mangled-name='fnvlist_lookup_uint8' filepath='../../module/nvpair/fnvpair.c' line='368' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_uint8'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='368' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='368' column='1'/>
	- <return type-id='type-id-95'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_int64' mangled-name='fnvlist_lookup_int64' filepath='../../module/nvpair/fnvpair.c' line='360' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int64'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='360' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='360' column='1'/>
	- <return type-id='type-id-104'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_int32' mangled-name='fnvlist_lookup_int32' filepath='../../module/nvpair/fnvpair.c' line='352' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int32'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='352' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='352' column='1'/>
	- <return type-id='type-id-24'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_int16' mangled-name='fnvlist_lookup_int16' filepath='../../module/nvpair/fnvpair.c' line='344' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int16'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='344' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='344' column='1'/>
	- <return type-id='type-id-25'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_int8' mangled-name='fnvlist_lookup_int8' filepath='../../module/nvpair/fnvpair.c' line='336' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_int8'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='336' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='336' column='1'/>
	- <return type-id='type-id-92'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_byte' mangled-name='fnvlist_lookup_byte' filepath='../../module/nvpair/fnvpair.c' line='328' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_byte'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='328' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='328' column='1'/>
	- <return type-id='type-id-89'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_boolean_value' mangled-name='fnvlist_lookup_boolean_value' filepath='../../module/nvpair/fnvpair.c' line='320' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_boolean_value'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='320' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='320' column='1'/>
	- <return type-id='type-id-87'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_boolean' mangled-name='fnvlist_lookup_boolean' filepath='../../module/nvpair/fnvpair.c' line='314' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_boolean'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='314' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='314' column='1'/>
	- <return type-id='type-id-87'/>
	- </function-decl>
	- <function-decl name='fnvlist_lookup_nvpair' mangled-name='fnvlist_lookup_nvpair' filepath='../../module/nvpair/fnvpair.c' line='305' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_lookup_nvpair'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='305' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='305' column='1'/>
	- <return type-id='type-id-221'/>
	- </function-decl>
	- <function-decl name='fnvlist_remove_nvpair' mangled-name='fnvlist_remove_nvpair' filepath='../../module/nvpair/fnvpair.c' line='299' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_remove_nvpair'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='299' column='1'/>
	- <parameter type-id='type-id-221' name='pair' filepath='../../module/nvpair/fnvpair.c' line='299' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_remove' mangled-name='fnvlist_remove' filepath='../../module/nvpair/fnvpair.c' line='293' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_remove'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='293' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='293' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_nvlist_array' mangled-name='fnvlist_add_nvlist_array' filepath='../../module/nvpair/fnvpair.c' line='286' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_nvlist_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='286' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='286' column='1'/>
	- <parameter type-id='type-id-220' name='val' filepath='../../module/nvpair/fnvpair.c' line='287' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='287' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_string_array' mangled-name='fnvlist_add_string_array' filepath='../../module/nvpair/fnvpair.c' line='279' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_string_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='279' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='279' column='1'/>
	- <parameter type-id='type-id-247' name='val' filepath='../../module/nvpair/fnvpair.c' line='280' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='280' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_uint64_array' mangled-name='fnvlist_add_uint64_array' filepath='../../module/nvpair/fnvpair.c' line='272' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint64_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='272' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='272' column='1'/>
	- <parameter type-id='type-id-226' name='val' filepath='../../module/nvpair/fnvpair.c' line='273' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='273' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_int64_array' mangled-name='fnvlist_add_int64_array' filepath='../../module/nvpair/fnvpair.c' line='266' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int64_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='266' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='266' column='1'/>
	- <parameter type-id='type-id-217' name='val' filepath='../../module/nvpair/fnvpair.c' line='266' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='266' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_uint32_array' mangled-name='fnvlist_add_uint32_array' filepath='../../module/nvpair/fnvpair.c' line='259' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint32_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='259' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='259' column='1'/>
	- <parameter type-id='type-id-225' name='val' filepath='../../module/nvpair/fnvpair.c' line='260' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='260' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_int32_array' mangled-name='fnvlist_add_int32_array' filepath='../../module/nvpair/fnvpair.c' line='253' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int32_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='253' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='253' column='1'/>
	- <parameter type-id='type-id-216' name='val' filepath='../../module/nvpair/fnvpair.c' line='253' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='253' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_uint16_array' mangled-name='fnvlist_add_uint16_array' filepath='../../module/nvpair/fnvpair.c' line='246' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint16_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='246' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='246' column='1'/>
	- <parameter type-id='type-id-224' name='val' filepath='../../module/nvpair/fnvpair.c' line='247' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='247' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_int16_array' mangled-name='fnvlist_add_int16_array' filepath='../../module/nvpair/fnvpair.c' line='240' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int16_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='240' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='240' column='1'/>
	- <parameter type-id='type-id-215' name='val' filepath='../../module/nvpair/fnvpair.c' line='240' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='240' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_uint8_array' mangled-name='fnvlist_add_uint8_array' filepath='../../module/nvpair/fnvpair.c' line='234' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint8_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='234' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='234' column='1'/>
	- <parameter type-id='type-id-227' name='val' filepath='../../module/nvpair/fnvpair.c' line='234' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='234' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_int8_array' mangled-name='fnvlist_add_int8_array' filepath='../../module/nvpair/fnvpair.c' line='228' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int8_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='228' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='228' column='1'/>
	- <parameter type-id='type-id-218' name='val' filepath='../../module/nvpair/fnvpair.c' line='228' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='228' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_byte_array' mangled-name='fnvlist_add_byte_array' filepath='../../module/nvpair/fnvpair.c' line='222' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_byte_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='222' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='222' column='1'/>
	- <parameter type-id='type-id-223' name='val' filepath='../../module/nvpair/fnvpair.c' line='222' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='222' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_boolean_array' mangled-name='fnvlist_add_boolean_array' filepath='../../module/nvpair/fnvpair.c' line='215' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_boolean_array'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='215' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='215' column='1'/>
	- <parameter type-id='type-id-131' name='val' filepath='../../module/nvpair/fnvpair.c' line='216' column='1'/>
	- <parameter type-id='type-id-112' name='n' filepath='../../module/nvpair/fnvpair.c' line='216' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_nvpair' mangled-name='fnvlist_add_nvpair' filepath='../../module/nvpair/fnvpair.c' line='209' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_nvpair'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='209' column='1'/>
	- <parameter type-id='type-id-221' name='pair' filepath='../../module/nvpair/fnvpair.c' line='209' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_nvlist' mangled-name='fnvlist_add_nvlist' filepath='../../module/nvpair/fnvpair.c' line='203' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_nvlist'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='203' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='203' column='1'/>
	- <parameter type-id='type-id-219' name='val' filepath='../../module/nvpair/fnvpair.c' line='203' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_string' mangled-name='fnvlist_add_string' filepath='../../module/nvpair/fnvpair.c' line='197' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_string'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='197' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='197' column='1'/>
	- <parameter type-id='type-id-41' name='val' filepath='../../module/nvpair/fnvpair.c' line='197' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_uint64' mangled-name='fnvlist_add_uint64' filepath='../../module/nvpair/fnvpair.c' line='191' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint64'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='191' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='191' column='1'/>
	- <parameter type-id='type-id-33' name='val' filepath='../../module/nvpair/fnvpair.c' line='191' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_int64' mangled-name='fnvlist_add_int64' filepath='../../module/nvpair/fnvpair.c' line='185' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int64'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='185' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='185' column='1'/>
	- <parameter type-id='type-id-104' name='val' filepath='../../module/nvpair/fnvpair.c' line='185' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_uint32' mangled-name='fnvlist_add_uint32' filepath='../../module/nvpair/fnvpair.c' line='179' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint32'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='179' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='179' column='1'/>
	- <parameter type-id='type-id-32' name='val' filepath='../../module/nvpair/fnvpair.c' line='179' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_int32' mangled-name='fnvlist_add_int32' filepath='../../module/nvpair/fnvpair.c' line='173' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int32'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='173' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='173' column='1'/>
	- <parameter type-id='type-id-24' name='val' filepath='../../module/nvpair/fnvpair.c' line='173' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_uint16' mangled-name='fnvlist_add_uint16' filepath='../../module/nvpair/fnvpair.c' line='167' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint16'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='167' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='167' column='1'/>
	- <parameter type-id='type-id-99' name='val' filepath='../../module/nvpair/fnvpair.c' line='167' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_int16' mangled-name='fnvlist_add_int16' filepath='../../module/nvpair/fnvpair.c' line='161' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int16'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='161' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='161' column='1'/>
	- <parameter type-id='type-id-25' name='val' filepath='../../module/nvpair/fnvpair.c' line='161' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_uint8' mangled-name='fnvlist_add_uint8' filepath='../../module/nvpair/fnvpair.c' line='155' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_uint8'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='155' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='155' column='1'/>
	- <parameter type-id='type-id-95' name='val' filepath='../../module/nvpair/fnvpair.c' line='155' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_int8' mangled-name='fnvlist_add_int8' filepath='../../module/nvpair/fnvpair.c' line='149' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_int8'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='149' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='149' column='1'/>
	- <parameter type-id='type-id-92' name='val' filepath='../../module/nvpair/fnvpair.c' line='149' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_byte' mangled-name='fnvlist_add_byte' filepath='../../module/nvpair/fnvpair.c' line='143' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_byte'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='143' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='143' column='1'/>
	- <parameter type-id='type-id-89' name='val' filepath='../../module/nvpair/fnvpair.c' line='143' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_boolean_value' mangled-name='fnvlist_add_boolean_value' filepath='../../module/nvpair/fnvpair.c' line='137' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_boolean_value'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='137' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='137' column='1'/>
	- <parameter type-id='type-id-87' name='val' filepath='../../module/nvpair/fnvpair.c' line='137' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_add_boolean' mangled-name='fnvlist_add_boolean' filepath='../../module/nvpair/fnvpair.c' line='131' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_add_boolean'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='131' column='1'/>
	- <parameter type-id='type-id-41' name='name' filepath='../../module/nvpair/fnvpair.c' line='131' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_num_pairs' mangled-name='fnvlist_num_pairs' filepath='../../module/nvpair/fnvpair.c' line='119' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_num_pairs'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='119' column='1'/>
	- <return type-id='type-id-54'/>
	- </function-decl>
	- <function-decl name='fnvlist_merge' mangled-name='fnvlist_merge' filepath='../../module/nvpair/fnvpair.c' line='113' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_merge'>
	- <parameter type-id='type-id-219' name='dst' filepath='../../module/nvpair/fnvpair.c' line='113' column='1'/>
	- <parameter type-id='type-id-219' name='src' filepath='../../module/nvpair/fnvpair.c' line='113' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_dup' mangled-name='fnvlist_dup' filepath='../../module/nvpair/fnvpair.c' line='105' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_dup'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='105' column='1'/>
	- <return type-id='type-id-219'/>
	- </function-decl>
	- <function-decl name='fnvlist_unpack' mangled-name='fnvlist_unpack' filepath='../../module/nvpair/fnvpair.c' line='97' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_unpack'>
	- <parameter type-id='type-id-45' name='buf' filepath='../../module/nvpair/fnvpair.c' line='97' column='1'/>
	- <parameter type-id='type-id-54' name='buflen' filepath='../../module/nvpair/fnvpair.c' line='97' column='1'/>
	- <return type-id='type-id-219'/>
	- </function-decl>
	- <function-decl name='fnvlist_pack_free' mangled-name='fnvlist_pack_free' filepath='../../module/nvpair/fnvpair.c' line='87' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_pack_free'>
	- <parameter type-id='type-id-45' name='pack' filepath='../../module/nvpair/fnvpair.c' line='87' column='1'/>
	- <parameter type-id='type-id-54' name='size' filepath='../../module/nvpair/fnvpair.c' line='87' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_pack' mangled-name='fnvlist_pack' filepath='../../module/nvpair/fnvpair.c' line='77' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_pack'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='77' column='1'/>
	- <parameter type-id='type-id-258' name='sizep' filepath='../../module/nvpair/fnvpair.c' line='77' column='1'/>
	- <return type-id='type-id-45'/>
	- </function-decl>
	- <function-decl name='fnvlist_size' mangled-name='fnvlist_size' filepath='../../module/nvpair/fnvpair.c' line='65' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_size'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='65' column='1'/>
	- <return type-id='type-id-54'/>
	- </function-decl>
	- <function-decl name='fnvlist_free' mangled-name='fnvlist_free' filepath='../../module/nvpair/fnvpair.c' line='59' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_free'>
	- <parameter type-id='type-id-219' name='nvl' filepath='../../module/nvpair/fnvpair.c' line='59' column='1'/>
	- <return type-id='type-id-21'/>
	- </function-decl>
	- <function-decl name='fnvlist_alloc' mangled-name='fnvlist_alloc' filepath='../../module/nvpair/fnvpair.c' line='51' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fnvlist_alloc'>
	- <return type-id='type-id-219'/>
	- </function-decl>
	- </abi-instr>
	- <abi-instr version='1.0' address-size='64' path='assert.c' comp-dir-path='/home/fedora/zfs/lib/libspl' language='LANG_C99'>
	- <var-decl name='aok' type-id='type-id-12' mangled-name='aok' visibility='default' filepath='../../lib/libspl/include/assert.h' line='37' column='1' elf-symbol-id='aok'/>
	- <function-decl name='libspl_assertf' mangled-name='libspl_assertf' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='32' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libspl_assertf'>
	- <parameter type-id='type-id-41' name='file' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='32' column='1'/>
	- <parameter type-id='type-id-41' name='func' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='32' column='1'/>
	- <parameter type-id='type-id-12' name='line' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='32' column='1'/>
	- <parameter type-id='type-id-41' name='format' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='33' column='1'/>
	- <parameter is-variadic='yes'/>
	- <return type-id='type-id-21'/>
	+ <abi-instr version='1.0' address-size='64' path='assert.c' language='LANG_C89'>
	+ <var-decl name='aok' type-id='95e97e5e' mangled-name='aok' visibility='default' elf-symbol-id='aok'/>
	+ <function-decl name='vfprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b7f2d5e6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='abort' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='48b5725f'/>
	</function-decl>
	</abi-instr>
	</abi-corpus>
	diff --git a/sys/contrib/openzfs/lib/libuutil/libuutil.abi b/sys/contrib/openzfs/lib/libuutil/libuutil.abi
	index c152289089c4..80af147a1ea1 100644
	--- a/sys/contrib/openzfs/lib/libuutil/libuutil.abi
	+++ b/sys/contrib/openzfs/lib/libuutil/libuutil.abi
	@@ -1,1608 +1,2731 @@
	-<abi-corpus path='libuutil.so' architecture='elf-amd-x86_64' soname='libuutil.so.3'>
	+<abi-corpus architecture='elf-amd-x86_64' soname='libuutil.so.3'>
	<elf-needed>
	<dependency name='libpthread.so.0'/>
	<dependency name='libc.so.6'/>
	<dependency name='ld-linux-x86-64.so.2'/>
	</elf-needed>
	<elf-function-symbols>
	+ <elf-symbol name='_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='_sol_getmntent' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_short' is-defined='yes'/>
	- <elf-symbol name='atomic_add_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_short_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_int_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_char_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_add_char' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_8' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_char' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_char_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_int' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_32' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_int' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_int_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_long' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_64,atomic_add_ptr' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_long' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_long_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_ptr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_ptr_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_64_nv,atomic_add_long_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_ptr_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_short' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_short_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_ulong_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_uchar_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_and_uchar' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_8' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_uint' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_32' is-defined='yes'/>
	- <elf-symbol name='atomic_and_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_32_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_and_ulong' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_64' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_ushort' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_16' is-defined='yes'/>
	- <elf-symbol name='atomic_and_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_16_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_cas_32' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_cas_uint' is-defined='yes'/>
	+ <elf-symbol name='atomic_cas_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_cas_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_cas_uchar' is-defined='yes'/>
	+ <elf-symbol name='atomic_cas_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_ptr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_cas_ulong' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_cas_ptr,atomic_cas_64' is-defined='yes'/>
	- <elf-symbol name='atomic_cas_ushort' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_cas_16' is-defined='yes'/>
	+ <elf-symbol name='atomic_cas_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_cas_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_clear_long_excl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_ushort' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_ulong_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_uchar' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_8_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_uint' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_32' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_32_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_ulong' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_64' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_16_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_32' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_uint' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_ulong_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_uchar' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_8' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_8_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_32_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_ulong' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_64' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_ushort' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_16' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_16_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_or_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_ushort_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_or_32' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_uint' is-defined='yes'/>
	- <elf-symbol name='atomic_or_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_uint_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_or_uchar' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_8' is-defined='yes'/>
	- <elf-symbol name='atomic_or_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_8_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_or_ulong' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_64' is-defined='yes'/>
	- <elf-symbol name='atomic_or_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_64_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_or_ushort' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_16' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_set_long_excl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_short' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_short_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_int_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_64' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_ptr,atomic_sub_long' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_char' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_char' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_char_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_8_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_int' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_32' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_char_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_int' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_int_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_long' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_long_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_ptr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_ptr_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_long_nv,atomic_sub_64_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_ptr_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_short' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_short_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_swap_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_swap_ushort' is-defined='yes'/>
	- <elf-symbol name='atomic_swap_32' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_swap_uint' is-defined='yes'/>
	- <elf-symbol name='atomic_swap_64' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_swap_ulong,atomic_swap_ptr' is-defined='yes'/>
	- <elf-symbol name='atomic_swap_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_swap_uchar' is-defined='yes'/>
	+ <elf-symbol name='atomic_swap_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_swap_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_swap_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_swap_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_ptr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_add' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_destroy_nodes' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_find' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_first' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_insert' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_insert_here' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_is_empty' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_last' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_nearest' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_numnodes' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_remove' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_swap' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_update' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_update_gt' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_update_lt' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_walk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='get_system_hostid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getexecname' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getextmntent' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getmntany' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getzoneid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libspl_assertf' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_head' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_insert_after' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_insert_before' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_insert_head' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_insert_tail' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_is_empty' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_link_active' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_link_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_link_replace' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_move_tail' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_next' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_prev' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_remove' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_remove_head' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_remove_tail' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_tail' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='membar_consumer' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='membar_enter' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='membar_exit' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='membar_producer' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='mkdirp' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='print_timestamp' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='spl_pagesize' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='strlcat' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='strlcpy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_alt_exit' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_find' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_first' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_insert' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_last' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_lockup' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_nearest_next' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_nearest_prev' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_next' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_node_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_node_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_numnodes' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_pool_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_pool_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_prev' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_release' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_remove' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_teardown' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_walk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_walk_end' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_walk_next' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_avl_walk_start' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_check_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_die' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_dprintf' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_dprintf_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_dprintf_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_dprintf_getname' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_dump' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_error' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='uu_exit_fatal' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_8' mangled-name='atomic_add_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='ee31ee44' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_char' mangled-name='atomic_add_char' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_char'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='28577a57' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_16' mangled-name='atomic_add_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='23bd8cb5' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_short' mangled-name='atomic_add_short' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_short'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='a2185560' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_32' mangled-name='atomic_add_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='3ff5601b' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_int' mangled-name='atomic_add_int' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_int'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='95e97e5e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_long' mangled-name='atomic_add_long' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_long'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='bd54fe1a' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_64' mangled-name='atomic_add_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9da381c4' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_ptr' mangled-name='atomic_add_ptr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_ptr'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='79a0948f' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_8' mangled-name='atomic_sub_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='ee31ee44' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_char' mangled-name='atomic_sub_char' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_char'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='28577a57' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_16' mangled-name='atomic_sub_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='23bd8cb5' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_short' mangled-name='atomic_sub_short' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_short'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='a2185560' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_32' mangled-name='atomic_sub_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='3ff5601b' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_int' mangled-name='atomic_sub_int' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_int'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='95e97e5e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_long' mangled-name='atomic_sub_long' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_long'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='bd54fe1a' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_64' mangled-name='atomic_sub_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9da381c4' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_ptr' mangled-name='atomic_sub_ptr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_ptr'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='79a0948f' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_8' mangled-name='atomic_or_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_uchar' mangled-name='atomic_or_uchar' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_uchar'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_16' mangled-name='atomic_or_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_ushort' mangled-name='atomic_or_ushort' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_ushort'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_32' mangled-name='atomic_or_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_uint' mangled-name='atomic_or_uint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_uint'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_ulong' mangled-name='atomic_or_ulong' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_ulong'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_64' mangled-name='atomic_or_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_8' mangled-name='atomic_and_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_uchar' mangled-name='atomic_and_uchar' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_uchar'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_16' mangled-name='atomic_and_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_ushort' mangled-name='atomic_and_ushort' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_ushort'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_32' mangled-name='atomic_and_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_uint' mangled-name='atomic_and_uint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_uint'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_ulong' mangled-name='atomic_and_ulong' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_ulong'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_64' mangled-name='atomic_and_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_8_nv' mangled-name='atomic_inc_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_uchar_nv' mangled-name='atomic_inc_uchar_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_uchar_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_16_nv' mangled-name='atomic_inc_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_ushort_nv' mangled-name='atomic_inc_ushort_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_ushort_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_32_nv' mangled-name='atomic_inc_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_uint_nv' mangled-name='atomic_inc_uint_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_uint_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_ulong_nv' mangled-name='atomic_inc_ulong_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_ulong_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_64_nv' mangled-name='atomic_inc_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_8_nv' mangled-name='atomic_dec_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_uchar_nv' mangled-name='atomic_dec_uchar_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_uchar_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_16_nv' mangled-name='atomic_dec_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_ushort_nv' mangled-name='atomic_dec_ushort_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_ushort_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_32_nv' mangled-name='atomic_dec_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_uint_nv' mangled-name='atomic_dec_uint_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_uint_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_ulong_nv' mangled-name='atomic_dec_ulong_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_ulong_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_64_nv' mangled-name='atomic_dec_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_8_nv' mangled-name='atomic_add_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='ee31ee44' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_char_nv' mangled-name='atomic_add_char_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_char_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='28577a57' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_16_nv' mangled-name='atomic_add_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='23bd8cb5' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_short_nv' mangled-name='atomic_add_short_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_short_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='a2185560' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_32_nv' mangled-name='atomic_add_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='3ff5601b' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_int_nv' mangled-name='atomic_add_int_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_int_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='95e97e5e' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_long_nv' mangled-name='atomic_add_long_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_long_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='bd54fe1a' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_64_nv' mangled-name='atomic_add_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9da381c4' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_ptr_nv' mangled-name='atomic_add_ptr_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_ptr_nv'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='79a0948f' name='bits'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_8_nv' mangled-name='atomic_sub_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='ee31ee44' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_char_nv' mangled-name='atomic_sub_char_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_char_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='28577a57' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_16_nv' mangled-name='atomic_sub_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='23bd8cb5' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_short_nv' mangled-name='atomic_sub_short_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_short_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='a2185560' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_32_nv' mangled-name='atomic_sub_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='3ff5601b' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_int_nv' mangled-name='atomic_sub_int_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_int_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='95e97e5e' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_long_nv' mangled-name='atomic_sub_long_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_long_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='bd54fe1a' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_64_nv' mangled-name='atomic_sub_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9da381c4' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_ptr_nv' mangled-name='atomic_sub_ptr_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_ptr_nv'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='79a0948f' name='bits'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_8_nv' mangled-name='atomic_or_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_uchar_nv' mangled-name='atomic_or_uchar_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_uchar_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_16_nv' mangled-name='atomic_or_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_ushort_nv' mangled-name='atomic_or_ushort_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_ushort_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_32_nv' mangled-name='atomic_or_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_uint_nv' mangled-name='atomic_or_uint_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_uint_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_ulong_nv' mangled-name='atomic_or_ulong_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_ulong_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_64_nv' mangled-name='atomic_or_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_8_nv' mangled-name='atomic_and_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_uchar_nv' mangled-name='atomic_and_uchar_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_uchar_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_16_nv' mangled-name='atomic_and_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_ushort_nv' mangled-name='atomic_and_ushort_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_ushort_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_32_nv' mangled-name='atomic_and_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_uint_nv' mangled-name='atomic_and_uint_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_uint_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_ulong_nv' mangled-name='atomic_and_ulong_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_ulong_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_64_nv' mangled-name='atomic_and_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_8' mangled-name='atomic_cas_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='exp'/>
	+ <parameter type-id='b96825af' name='des'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_uchar' mangled-name='atomic_cas_uchar' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_uchar'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='exp'/>
	+ <parameter type-id='d8bf0010' name='des'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_16' mangled-name='atomic_cas_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='exp'/>
	+ <parameter type-id='149c6638' name='des'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_ushort' mangled-name='atomic_cas_ushort' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_ushort'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='exp'/>
	+ <parameter type-id='d908a348' name='des'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_32' mangled-name='atomic_cas_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='exp'/>
	+ <parameter type-id='8f92235e' name='des'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_uint' mangled-name='atomic_cas_uint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_uint'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='exp'/>
	+ <parameter type-id='3502e3ff' name='des'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_ulong' mangled-name='atomic_cas_ulong' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_ulong'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='exp'/>
	+ <parameter type-id='ee1f298e' name='des'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_64' mangled-name='atomic_cas_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='exp'/>
	+ <parameter type-id='9c313c2d' name='des'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_ptr' mangled-name='atomic_cas_ptr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_ptr'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='eaa32e2f' name='exp'/>
	+ <parameter type-id='eaa32e2f' name='des'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_8' mangled-name='atomic_swap_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_uchar' mangled-name='atomic_swap_uchar' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_uchar'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_16' mangled-name='atomic_swap_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_ushort' mangled-name='atomic_swap_ushort' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_ushort'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_32' mangled-name='atomic_swap_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_uint' mangled-name='atomic_swap_uint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_uint'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_ulong' mangled-name='atomic_swap_ulong' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_ulong'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_64' mangled-name='atomic_swap_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_ptr' mangled-name='atomic_swap_ptr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_ptr'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='eaa32e2f' name='bits'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='atomic_set_long_excl' mangled-name='atomic_set_long_excl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_set_long_excl'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='3502e3ff' name='value'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='atomic_clear_long_excl' mangled-name='atomic_clear_long_excl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_clear_long_excl'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='3502e3ff' name='value'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='membar_enter' mangled-name='membar_enter' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='membar_enter'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='membar_exit' mangled-name='membar_exit' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='membar_exit'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='membar_producer' mangled-name='membar_producer' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='membar_producer'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='membar_consumer' mangled-name='membar_consumer' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='membar_consumer'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <type-decl name='long int' size-in-bits='64' id='bd54fe1a'/>
	+ <type-decl name='short int' size-in-bits='16' id='a2185560'/>
	+ <type-decl name='signed char' size-in-bits='8' id='28577a57'/>
	+ <typedef-decl name='int8_t' type-id='28577a57' id='ee31ee44'/>
	+ <typedef-decl name='uint32_t' type-id='f0981eeb' id='8f92235e'/>
	+ <typedef-decl name='uint8_t' type-id='002ac4a6' id='b96825af'/>
	+ <typedef-decl name='uint_t' type-id='f0981eeb' id='3502e3ff'/>
	+ <type-decl name='unsigned char' size-in-bits='8' id='002ac4a6'/>
	+ <type-decl name='unsigned short int' size-in-bits='16' id='8efea9e5'/>
	+ <type-decl name='unsigned int' size-in-bits='32' id='f0981eeb'/>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='list.c' language='LANG_C89'>
	+ <typedef-decl name='list_t' type-id='e824dae9' id='0899125f'/>
	+ <class-decl name='list' size-in-bits='256' is-struct='yes' visibility='default' id='e824dae9'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='list_size' type-id='b59d7dce' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='list_offset' type-id='b59d7dce' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='list_head' type-id='b0b5e45e' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <class-decl name='list_node' size-in-bits='128' is-struct='yes' visibility='default' id='b0b5e45e'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='next' type-id='b03eadb4' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='prev' type-id='b03eadb4' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='list_node_t' type-id='b0b5e45e' id='b21843b2'/>
	+ <pointer-type-def type-id='b0b5e45e' size-in-bits='64' id='b03eadb4'/>
	+ <pointer-type-def type-id='b21843b2' size-in-bits='64' id='ccc38265'/>
	+ <pointer-type-def type-id='0899125f' size-in-bits='64' id='352ec160'/>
	+ <function-decl name='list_create' mangled-name='list_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_create'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='b59d7dce' name='size'/>
	+ <parameter type-id='b59d7dce' name='offset'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_destroy' mangled-name='list_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_destroy'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_insert_head' mangled-name='list_insert_head' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_insert_head'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_insert_after' mangled-name='list_insert_after' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_insert_after'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <parameter type-id='eaa32e2f' name='nobject'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_insert_tail' mangled-name='list_insert_tail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_insert_tail'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_insert_before' mangled-name='list_insert_before' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_insert_before'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <parameter type-id='eaa32e2f' name='nobject'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_remove' mangled-name='list_remove' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_remove'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_remove_head' mangled-name='list_remove_head' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_remove_head'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_remove_tail' mangled-name='list_remove_tail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_remove_tail'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_head' mangled-name='list_head' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_head'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_tail' mangled-name='list_tail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_tail'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_next' mangled-name='list_next' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_next'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_prev' mangled-name='list_prev' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_prev'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_move_tail' mangled-name='list_move_tail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_move_tail'>
	+ <parameter type-id='352ec160' name='dst'/>
	+ <parameter type-id='352ec160' name='src'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_link_replace' mangled-name='list_link_replace' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_link_replace'>
	+ <parameter type-id='ccc38265' name='lold'/>
	+ <parameter type-id='ccc38265' name='lnew'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_link_init' mangled-name='list_link_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_link_init'>
	+ <parameter type-id='ccc38265' name='ln'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_link_active' mangled-name='list_link_active' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_link_active'>
	+ <parameter type-id='ccc38265' name='ln'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='list_is_empty' mangled-name='list_is_empty' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_is_empty'>
	+ <parameter type-id='352ec160' name='list'/>
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	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='665' column='1'/>
	- <return type-id='type-id-8'/>
	- </function-decl>
	- <function-decl name='uu_list_first' mangled-name='uu_list_first' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='656' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_first'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='656' column='1'/>
	- <return type-id='type-id-8'/>
	- </function-decl>
	- <function-decl name='uu_list_numnodes' mangled-name='uu_list_numnodes' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='650' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_numnodes'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='650' column='1'/>
	- <return type-id='type-id-4'/>
	- </function-decl>
	- <function-decl name='uu_list_insert_after' mangled-name='uu_list_insert_after' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='624' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_insert_after'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='624' column='1'/>
	- <parameter type-id='type-id-8' name='target' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='624' column='1'/>
	- <parameter type-id='type-id-8' name='elem' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='624' column='1'/>
	- <return type-id='type-id-16'/>
	- </function-decl>
	- <function-decl name='uu_list_insert_before' mangled-name='uu_list_insert_before' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='598' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_insert_before'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='598' column='1'/>
	- <parameter type-id='type-id-8' name='target' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='598' column='1'/>
	- <parameter type-id='type-id-8' name='elem' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='598' column='1'/>
	- <return type-id='type-id-16'/>
	- </function-decl>
	- <function-decl name='uu_list_teardown' mangled-name='uu_list_teardown' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='580' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_teardown'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='580' column='1'/>
	- <parameter type-id='type-id-61' name='cookie' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='580' column='1'/>
	- <return type-id='type-id-8'/>
	- </function-decl>
	- <function-decl name='uu_list_remove' mangled-name='uu_list_remove' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='540' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_remove'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='540' column='1'/>
	- <parameter type-id='type-id-8' name='elem' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='540' column='1'/>
	- <return type-id='type-id-3'/>
	- </function-decl>
	- <function-decl name='uu_list_walk' mangled-name='uu_list_walk' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='495' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_walk'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='495' column='1'/>
	- <parameter type-id='type-id-60' name='func' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='495' column='1'/>
	- <parameter type-id='type-id-8' name='private' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='495' column='1'/>
	- <parameter type-id='type-id-55' name='flags' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='495' column='1'/>
	- <return type-id='type-id-16'/>
	- </function-decl>
	- <function-decl name='uu_list_walk_end' mangled-name='uu_list_walk_end' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='488' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_walk_end'>
	- <parameter type-id='type-id-80' name='wp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='488' column='1'/>
	- <return type-id='type-id-3'/>
	- </function-decl>
	- <function-decl name='uu_list_walk_next' mangled-name='uu_list_walk_next' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='476' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_walk_next'>
	- <parameter type-id='type-id-80' name='wp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='476' column='1'/>
	- <return type-id='type-id-8'/>
	- </function-decl>
	- <function-decl name='uu_list_walk_start' mangled-name='uu_list_walk_start' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='456' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_walk_start'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='456' column='1'/>
	- <parameter type-id='type-id-55' name='flags' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='456' column='1'/>
	- <return type-id='type-id-80'/>
	- </function-decl>
	- <function-decl name='uu_list_nearest_prev' mangled-name='uu_list_nearest_prev' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='373' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_nearest_prev'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='373' column='1'/>
	- <parameter type-id='type-id-83' name='idx' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='373' column='1'/>
	- <return type-id='type-id-8'/>
	- </function-decl>
	- <function-decl name='uu_list_nearest_next' mangled-name='uu_list_nearest_next' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='348' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_nearest_next'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='348' column='1'/>
	- <parameter type-id='type-id-83' name='idx' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='348' column='1'/>
	- <return type-id='type-id-8'/>
	- </function-decl>
	- <function-decl name='uu_list_find' mangled-name='uu_list_find' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='315' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_find'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='315' column='1'/>
	- <parameter type-id='type-id-8' name='elem' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='315' column='1'/>
	- <parameter type-id='type-id-8' name='private' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='315' column='1'/>
	- <parameter type-id='type-id-86' name='out' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='315' column='1'/>
	- <return type-id='type-id-8'/>
	- </function-decl>
	- <function-decl name='uu_list_insert' mangled-name='uu_list_insert' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='292' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_insert'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='292' column='1'/>
	- <parameter type-id='type-id-8' name='elem' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='292' column='1'/>
	- <parameter type-id='type-id-83' name='idx' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='292' column='1'/>
	- <return type-id='type-id-3'/>
	- </function-decl>
	- <function-decl name='uu_list_destroy' mangled-name='uu_list_destroy' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='231' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_destroy'>
	- <parameter type-id='type-id-81' name='lp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='231' column='1'/>
	- <return type-id='type-id-3'/>
	- </function-decl>
	- <function-decl name='uu_list_create' mangled-name='uu_list_create' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='180' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_create'>
	- <parameter type-id='type-id-71' name='pp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='180' column='1'/>
	- <parameter type-id='type-id-8' name='parent' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='180' column='1'/>
	- <parameter type-id='type-id-55' name='flags' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='180' column='1'/>
	- <return type-id='type-id-81'/>
	- </function-decl>
	- <function-decl name='uu_list_node_fini' mangled-name='uu_list_node_fini' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='157' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_node_fini'>
	- <parameter type-id='type-id-8' name='base' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='157' column='1'/>
	- <parameter type-id='type-id-87' name='np_arg' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='157' column='1'/>
	- <parameter type-id='type-id-71' name='pp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='157' column='1'/>
	- <return type-id='type-id-3'/>
	- </function-decl>
	- <function-decl name='uu_list_node_init' mangled-name='uu_list_node_init' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='133' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_node_init'>
	- <parameter type-id='type-id-8' name='base' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='133' column='1'/>
	- <parameter type-id='type-id-87' name='np_arg' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='133' column='1'/>
	- <parameter type-id='type-id-71' name='pp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='133' column='1'/>
	- <return type-id='type-id-3'/>
	- </function-decl>
	- <function-decl name='uu_list_pool_destroy' mangled-name='uu_list_pool_destroy' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='110' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_pool_destroy'>
	- <parameter type-id='type-id-71' name='pp' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='110' column='1'/>
	- <return type-id='type-id-3'/>
	- </function-decl>
	- <function-decl name='uu_list_pool_create' mangled-name='uu_list_pool_create' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='63' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_pool_create'>
	- <parameter type-id='type-id-7' name='name' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='63' column='1'/>
	- <parameter type-id='type-id-4' name='objsize' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='63' column='1'/>
	- <parameter type-id='type-id-4' name='nodeoffset' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='64' column='1'/>
	- <parameter type-id='type-id-31' name='compare_func' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='64' column='1'/>
	- <parameter type-id='type-id-55' name='flags' filepath='/home/fedora/zfs/lib/libuutil/uu_list.c' line='64' column='1'/>
	- <return type-id='type-id-71'/>
	- </function-decl>
	+ <typedef-decl name='ulong_t' type-id='7359adad' id='ee1f298e'/>
	+ <class-decl name='uu_avl_walk' size-in-bits='320' is-struct='yes' visibility='default' id='e70a39e3'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='uaw_next' type-id='5842d146' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='uaw_prev' type-id='5842d146' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='uaw_avl' type-id='a5c21a38' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='uaw_next_result' type-id='eaa32e2f' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='256'>
	+ <var-decl name='uaw_dir' type-id='ee31ee44' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='264'>
	+ <var-decl name='uaw_robust' type-id='b96825af' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='uu_avl_walk_t' type-id='e70a39e3' id='edd8457b'/>
	+ <typedef-decl name='uu_avl_t' type-id='4af029d1' id='bb7f0973'/>
	+ <typedef-decl name='int8_t' type-id='28577a57' id='ee31ee44'/>
	+ <typedef-decl name='uint32_t' type-id='f0981eeb' id='8f92235e'/>
	+ <typedef-decl name='uu_avl_node_t' type-id='f65f4326' id='73a65116'/>
	+ <class-decl name='uu_avl_node' size-in-bits='192' is-struct='yes' visibility='default' id='f65f4326'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='uan_opaque' type-id='0ce65a8b' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='uu_walk_fn_t' type-id='96ee24a5' id='9d1aa0dc'/>
	+ <typedef-decl name='uu_avl_index_t' type-id='e475ab95' id='5d7f5fc8'/>
	+ <typedef-decl name='avl_tree_t' type-id='b351119f' id='f20fbd51'/>
	+ <typedef-decl name='pthread_mutexattr_t' type-id='e7fcd879' id='8afd6070'/>
	+ <union-decl name='__anonymous_union__1' size-in-bits='32' is-anonymous='yes' visibility='default' id='e7fcd879'>
	+ <data-member access='private'>
	+ <var-decl name='__size' type-id='8e0573fd' visibility='default'/>
	+ </data-member>
	+ <data-member access='private'>
	+ <var-decl name='__align' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ </union-decl>
	+ <typedef-decl name='avl_index_t' type-id='e475ab95' id='fba6cb51'/>
	+ <pointer-type-def type-id='0e01899c' size-in-bits='64' id='4d98cd5a'/>
	+ <pointer-type-def type-id='fba6cb51' size-in-bits='64' id='32adbf30'/>
	+ <pointer-type-def type-id='428b67b3' size-in-bits='64' id='bf311473'/>
	+ <pointer-type-def type-id='b351119f' size-in-bits='64' id='716943c7'/>
	+ <pointer-type-def type-id='f20fbd51' size-in-bits='64' id='a3681dea'/>
	+ <qualified-type-def type-id='8afd6070' const='yes' id='1d853360'/>
	+ <pointer-type-def type-id='1d853360' size-in-bits='64' id='c2afbd7e'/>
	+ <pointer-type-def type-id='96ee24a5' size-in-bits='64' id='585e1de9'/>
	+ <pointer-type-def type-id='7a6844eb' size-in-bits='64' id='18c91f9e'/>
	+ <pointer-type-def type-id='5d7f5fc8' size-in-bits='64' id='813a2225'/>
	+ <pointer-type-def type-id='73a65116' size-in-bits='64' id='2dc35b9d'/>
	+ <pointer-type-def type-id='7f84e390' size-in-bits='64' id='de82c773'/>
	+ <pointer-type-def type-id='bb7f0973' size-in-bits='64' id='a5c21a38'/>
	+ <pointer-type-def type-id='edd8457b' size-in-bits='64' id='5842d146'/>
	+ <pointer-type-def type-id='40f93560' size-in-bits='64' id='d502b39f'/>
	+ <pointer-type-def type-id='9d1aa0dc' size-in-bits='64' id='30a42b6d'/>
	+ <pointer-type-def type-id='eaa32e2f' size-in-bits='64' id='63e171df'/>
	+ <function-decl name='uu_avl_pool_create' mangled-name='uu_avl_pool_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_pool_create'>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='b59d7dce' name='objsize'/>
	+ <parameter type-id='b59d7dce' name='nodeoffset'/>
	+ <parameter type-id='d502b39f' name='compare_func'/>
	+ <parameter type-id='8f92235e' name='flags'/>
	+ <return type-id='de82c773'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_pool_destroy' mangled-name='uu_avl_pool_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_pool_destroy'>
	+ <parameter type-id='de82c773' name='pp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_node_init' mangled-name='uu_avl_node_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_node_init'>
	+ <parameter type-id='eaa32e2f' name='base'/>
	+ <parameter type-id='2dc35b9d' name='np'/>
	+ <parameter type-id='de82c773' name='pp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_node_fini' mangled-name='uu_avl_node_fini' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_node_fini'>
	+ <parameter type-id='eaa32e2f' name='base'/>
	+ <parameter type-id='2dc35b9d' name='np'/>
	+ <parameter type-id='de82c773' name='pp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_create' mangled-name='uu_avl_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_create'>
	+ <parameter type-id='de82c773' name='pp'/>
	+ <parameter type-id='eaa32e2f' name='parent'/>
	+ <parameter type-id='8f92235e' name='flags'/>
	+ <return type-id='a5c21a38'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_destroy' mangled-name='uu_avl_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_destroy'>
	+ <parameter type-id='a5c21a38' name='ap'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_numnodes' mangled-name='uu_avl_numnodes' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_numnodes'>
	+ <parameter type-id='a5c21a38' name='ap'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_first' mangled-name='uu_avl_first' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_first'>
	+ <parameter type-id='a5c21a38' name='ap'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_last' mangled-name='uu_avl_last' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_last'>
	+ <parameter type-id='a5c21a38' name='ap'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_next' mangled-name='uu_avl_next' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_next'>
	+ <parameter type-id='a5c21a38' name='ap'/>
	+ <parameter type-id='eaa32e2f' name='node'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_prev' mangled-name='uu_avl_prev' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_avl_prev'>
	+ <parameter type-id='a5c21a38' name='ap'/>
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	+ <parameter type-id='8f92235e' name='flags'/>
	+ <return type-id='0c0b229b'/>
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	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
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	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='eaa32e2f' name='elem'/>
	+ <parameter type-id='f0dd35ff' name='idx'/>
	+ <return type-id='48b5725f'/>
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	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='eaa32e2f' name='elem'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <parameter type-id='ecbc0046' name='out'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_nearest_next' mangled-name='uu_list_nearest_next' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_nearest_next'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='f0dd35ff' name='idx'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
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	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='f0dd35ff' name='idx'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_walk_start' mangled-name='uu_list_walk_start' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_walk_start'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='8f92235e' name='flags'/>
	+ <return type-id='4d848103'/>
	+ </function-decl>
	+ <function-decl name='uu_list_walk_next' mangled-name='uu_list_walk_next' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_walk_next'>
	+ <parameter type-id='4d848103' name='wp'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_walk_end' mangled-name='uu_list_walk_end' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_walk_end'>
	+ <parameter type-id='4d848103' name='wp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_walk' mangled-name='uu_list_walk' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_walk'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='30a42b6d' name='func'/>
	+ <parameter type-id='eaa32e2f' name='private'/>
	+ <parameter type-id='8f92235e' name='flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='uu_list_remove' mangled-name='uu_list_remove' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_remove'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='eaa32e2f' name='elem'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_insert_before' mangled-name='uu_list_insert_before' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_insert_before'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='eaa32e2f' name='target'/>
	+ <parameter type-id='eaa32e2f' name='elem'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='uu_list_insert_after' mangled-name='uu_list_insert_after' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_insert_after'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='eaa32e2f' name='target'/>
	+ <parameter type-id='eaa32e2f' name='elem'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='uu_list_numnodes' mangled-name='uu_list_numnodes' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_numnodes'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='uu_list_first' mangled-name='uu_list_first' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_first'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_teardown' mangled-name='uu_list_teardown' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_teardown'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='63e171df' name='cookie'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_last' mangled-name='uu_list_last' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_last'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_next' mangled-name='uu_list_next' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_next'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='eaa32e2f' name='elem'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_prev' mangled-name='uu_list_prev' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_prev'>
	+ <parameter type-id='0c0b229b' name='lp'/>
	+ <parameter type-id='eaa32e2f' name='elem'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_lockup' mangled-name='uu_list_lockup' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_lockup'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_list_release' mangled-name='uu_list_release' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_list_release'>
	+ <return type-id='48b5725f'/>
	</function-decl>
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	- <abi-instr version='1.0' address-size='64' path='os/linux/zone.c' comp-dir-path='/home/fedora/zfs/lib/libspl' language='LANG_C99'>
	- <typedef-decl name='zoneid_t' type-id='type-id-16' filepath='../../lib/libspl/include/sys/types.h' line='47' column='1' id='type-id-144'/>
	- <function-decl name='getzoneid' mangled-name='getzoneid' filepath='os/linux/zone.c' line='29' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='getzoneid'>
	- <return type-id='type-id-144'/>
	+ <abi-instr version='1.0' address-size='64' path='uu_misc.c' language='LANG_C89'>
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	+ <typedef-decl name='pthread_t' type-id='7359adad' id='4051f5e7'/>
	+ <qualified-type-def type-id='8efea9e5' const='yes' id='3beb2af4'/>
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	+ <pointer-type-def type-id='c5c76c9c' size-in-bits='64' id='b7f9d8e6'/>
	+ <function-decl name='uu_error' mangled-name='uu_error' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_error'>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='uu_strerror' mangled-name='uu_strerror' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_strerror'>
	+ <parameter type-id='8f92235e' name='code'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='uu_dump' mangled-name='uu_dump' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_dump'>
	+ <parameter type-id='822cd80b' name='out'/>
	+ <parameter type-id='80f4b756' name='prefix'/>
	+ <parameter type-id='eaa32e2f' name='buf'/>
	+ <parameter type-id='b59d7dce' name='len'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='pthread_setspecific' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='2de5383b'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='pthread_key_create' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='ce04b822'/>
	+ <parameter type-id='b7f9d8e6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='pthread_getspecific' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='2de5383b'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='__errno_location' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='7292109c'/>
	+ </function-decl>
	+ <function-decl name='pthread_self' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='4051f5e7'/>
	+ </function-decl>
	+ <function-decl name='pause' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='abort' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='pthread_atfork' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='953b12f8'/>
	+ <parameter type-id='953b12f8'/>
	+ <parameter type-id='953b12f8'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='__ctype_b_loc' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='c59e1ef0'/>
	+ </function-decl>
	+ <function-type size-in-bits='64' id='ee076206'>
	+ <return type-id='48b5725f'/>
	+ </function-type>
	+ <function-type size-in-bits='64' id='c5c76c9c'>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='48b5725f'/>
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	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='uu_open.c' language='LANG_C89'>
	+ <typedef-decl name='clockid_t' type-id='08f9a87a' id='a1c3b834'/>
	+ <typedef-decl name='__clockid_t' type-id='95e97e5e' id='08f9a87a'/>
	+ <class-decl name='timespec' size-in-bits='128' is-struct='yes' visibility='default' id='a9c79a1f'>
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	+ <var-decl name='tv_sec' type-id='65eda9c0' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='tv_nsec' type-id='03085adc' visibility='default'/>
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	+ <typedef-decl name='__time_t' type-id='bd54fe1a' id='65eda9c0'/>
	+ <typedef-decl name='__syscall_slong_t' type-id='bd54fe1a' id='03085adc'/>
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	+ <function-decl name='uu_open_tmp' mangled-name='uu_open_tmp' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_open_tmp'>
	+ <parameter type-id='80f4b756' name='dir'/>
	+ <parameter type-id='3502e3ff' name='uflags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='clock_gettime' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a1c3b834'/>
	+ <parameter type-id='3d83ba87'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='snprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='unlink' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
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	- <abi-instr version='1.0' address-size='64' path='assert.c' comp-dir-path='/home/fedora/zfs/lib/libspl' language='LANG_C99'>
	- <var-decl name='aok' type-id='type-id-16' mangled-name='aok' visibility='default' filepath='../../lib/libspl/include/assert.h' line='37' column='1' elf-symbol-id='aok'/>
	- <function-decl name='libspl_assertf' mangled-name='libspl_assertf' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='32' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libspl_assertf'>
	- <parameter type-id='type-id-7' name='file' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='32' column='1'/>
	- <parameter type-id='type-id-7' name='func' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='32' column='1'/>
	- <parameter type-id='type-id-16' name='line' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='32' column='1'/>
	- <parameter type-id='type-id-7' name='format' filepath='/home/fedora/zfs/lib/libspl/assert.c' line='33' column='1'/>
	+ <abi-instr version='1.0' address-size='64' path='uu_pname.c' language='LANG_C89'>
	+ <function-decl name='uu_exit_ok' mangled-name='uu_exit_ok' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_exit_ok'>
	+ <return type-id='7292109c'/>
	+ </function-decl>
	+ <function-decl name='uu_exit_fatal' mangled-name='uu_exit_fatal' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_exit_fatal'>
	+ <return type-id='7292109c'/>
	+ </function-decl>
	+ <function-decl name='uu_exit_usage' mangled-name='uu_exit_usage' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_exit_usage'>
	+ <return type-id='7292109c'/>
	+ </function-decl>
	+ <function-decl name='uu_alt_exit' mangled-name='uu_alt_exit' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_alt_exit'>
	+ <parameter type-id='95e97e5e' name='profile'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_vwarn' mangled-name='uu_vwarn' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_vwarn'>
	+ <parameter type-id='80f4b756' name='format'/>
	+ <parameter type-id='b7f2d5e6' name='alist'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_warn' mangled-name='uu_warn' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_warn'>
	+ <parameter type-id='80f4b756' name='format'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_vdie' mangled-name='uu_vdie' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_vdie'>
	+ <parameter type-id='80f4b756' name='format'/>
	+ <parameter type-id='b7f2d5e6' name='alist'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_die' mangled-name='uu_die' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_die'>
	+ <parameter type-id='80f4b756' name='format'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_vxdie' mangled-name='uu_vxdie' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_vxdie'>
	+ <parameter type-id='95e97e5e' name='status'/>
	+ <parameter type-id='80f4b756' name='format'/>
	+ <parameter type-id='b7f2d5e6' name='alist'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_xdie' mangled-name='uu_xdie' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_xdie'>
	+ <parameter type-id='95e97e5e' name='status'/>
	+ <parameter type-id='80f4b756' name='format'/>
	<parameter is-variadic='yes'/>
	- <return type-id='type-id-3'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='uu_setpname' mangled-name='uu_setpname' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_setpname'>
	+ <parameter type-id='26a90f95' name='arg0'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='uu_getpname' mangled-name='uu_getpname' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_getpname'>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <var-decl name='uu_exit_ok_value' type-id='95e97e5e' mangled-name='uu_exit_ok_value' visibility='default' elf-symbol-id='uu_exit_ok_value'/>
	+ <var-decl name='uu_exit_fatal_value' type-id='95e97e5e' mangled-name='uu_exit_fatal_value' visibility='default' elf-symbol-id='uu_exit_fatal_value'/>
	+ <var-decl name='uu_exit_usage_value' type-id='95e97e5e' mangled-name='uu_exit_usage_value' visibility='default' elf-symbol-id='uu_exit_usage_value'/>
	+ <function-decl name='strerror' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='strrchr' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='exit' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='getexecname' mangled-name='getexecname' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='getexecname'>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='uu_string.c' language='LANG_C89'>
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	+ <enum-decl name='__anonymous_enum__' is-anonymous='yes' id='08f5ca17'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='B_FALSE' value='0'/>
	+ <enumerator name='B_TRUE' value='1'/>
	+ </enum-decl>
	+ <function-decl name='uu_streq' mangled-name='uu_streq' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_streq'>
	+ <parameter type-id='80f4b756' name='a'/>
	+ <parameter type-id='80f4b756' name='b'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='uu_strcaseeq' mangled-name='uu_strcaseeq' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_strcaseeq'>
	+ <parameter type-id='80f4b756' name='a'/>
	+ <parameter type-id='80f4b756' name='b'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='uu_strbw' mangled-name='uu_strbw' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='uu_strbw'>
	+ <parameter type-id='80f4b756' name='a'/>
	+ <parameter type-id='80f4b756' name='b'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='strcasecmp' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='strncmp' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
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	diff --git a/sys/contrib/openzfs/lib/libzfs/libzfs.abi b/sys/contrib/openzfs/lib/libzfs/libzfs.abi
	index 572297123035..2af0bd6f6956 100644
	--- a/sys/contrib/openzfs/lib/libzfs/libzfs.abi
	+++ b/sys/contrib/openzfs/lib/libzfs/libzfs.abi
	@@ -1,6252 +1,7975 @@
	-<abi-corpus path='libzfs.so' architecture='elf-amd-x86_64' soname='libzfs.so.4'>
	+<abi-corpus architecture='elf-amd-x86_64' soname='libzfs.so.4'>
	<elf-needed>
	<dependency name='libzfs_core.so.3'/>
	+ <dependency name='libuuid.so.1'/>
	+ <dependency name='librt.so.1'/>
	+ <dependency name='libblkid.so.1'/>
	+ <dependency name='libudev.so.1'/>
	<dependency name='libnvpair.so.3'/>
	<dependency name='libuutil.so.3'/>
	<dependency name='libm.so.6'/>
	- <dependency name='libcrypto.so.1.1'/>
	+ <dependency name='libcrypto.so.10'/>
	<dependency name='libz.so.1'/>
	<dependency name='libpthread.so.0'/>
	<dependency name='libc.so.6'/>
	</elf-needed>
	<elf-function-symbols>
	<elf-symbol name='SHA256Init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='SHA2Final' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='SHA2Init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='SHA2Update' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='SHA384Init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='SHA512Init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='bookmark_namecheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='changelist_free' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='changelist_gather' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='changelist_haszonedchild' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='changelist_postfix' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='changelist_prefix' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='changelist_remove' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='changelist_rename' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='changelist_unshare' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='cityhash4' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='color_end' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='color_start' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='create_parents' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='dataset_namecheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='dataset_nestcheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='do_mount' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='do_unmount' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='entity_namecheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='find_shares_object' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_2_byteswap' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_2_incremental_byteswap' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_2_incremental_native' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_2_native' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_4_byteswap' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_4_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_4_impl_set' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_4_incremental_byteswap' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_4_incremental_native' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_4_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_4_native' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_4_native_varsize' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='fletcher_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='get_dataset_depth' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getprop_uint64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='is_mounted' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='is_shared' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='isa_child_of' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libshare_nfs_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libshare_smb_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_add_handle' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_envvar_is_set' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_errno' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_error_action' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_error_description' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_error_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_free_str_array' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_load_module' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_mnttab_add' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_mnttab_cache' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_mnttab_find' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_mnttab_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_mnttab_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_mnttab_remove' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_print_on_error' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_run_process' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_run_process_get_stdout' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_run_process_get_stdout_nopath' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_set_pipe_max' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='make_bookmark_handle' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='make_dataset_handle' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='make_dataset_handle_zc' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='make_dataset_simple_handle_zc' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='mountpoint_namecheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='namespace_clear' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='no_memory' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='permset_namecheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='pool_namecheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='printf_color' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='register_fstype' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='remove_mountpoint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='sa_commit_shares' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='sa_disable_share' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='sa_enable_share' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='sa_errorstr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='sa_is_shared' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='sa_validate_shareopts' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='snapshot_namecheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='unshare_one' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zcmd_alloc_dst_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zcmd_expand_dst_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zcmd_free_nvlists' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zcmd_read_dst_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zcmd_write_conf_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zcmd_write_src_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfeature_depends_on' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfeature_is_supported' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfeature_is_valid_guid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfeature_lookup_guid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfeature_lookup_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_adjust_mount_options' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_alloc' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_allocatable_devs' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_asprintf' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_bookmark_exists' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_clone' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_close' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_commit_all_shares' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_commit_nfs_shares' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_commit_proto' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_commit_shares' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_commit_smb_shares' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_component_namecheck' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_create_ancestors' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_crypto_attempt_load_keys' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_crypto_clone_check' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_crypto_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_crypto_get_encryption_root' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_crypto_load_key' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_crypto_rewrap' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_crypto_unload_key' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_dataset_exists' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_dataset_name_hidden' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_deleg_canonicalize_perm' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_deleg_verify_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_deleg_whokey' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_destroy_snaps' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_destroy_snaps_nvl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_error' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_error_aux' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_error_fmt' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_expand_proplist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_foreach_mountpoint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_all_props' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_clones_nvl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_fsacl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_handle' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_holds' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_pool_handle' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_pool_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_recvd_props' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_type' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_get_user_props' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_handle_dup' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_hold' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_hold_nvl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_ioctl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_is_mountable' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_is_mounted' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_is_shared' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_is_shared_nfs' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_is_shared_proto' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_is_shared_smb' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_bookmarks' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_children' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_dependents' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_filesystems' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_mounted' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_root' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_snapshots' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_snapshots_sorted' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_iter_snapspec' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_mod_supported' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_mount' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_mount_at' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_mount_delegation_check' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_name_to_prop' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_name_valid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_nicestrtonum' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_open' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_parent_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_parse_mount_options' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_parse_options' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_path_to_zhandle' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_promote' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_align_right' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_column_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_default_numeric' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_default_string' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_delegatable' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_encryption_key_param' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_get' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_get_int' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_get_numeric' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zfs_prop_get_recvd' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_is_draid_spare' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_mount_datasets' type='func-type' binding='weak-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_name_to_prop' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_obj_to_path' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_open' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_pool_state_to_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_props_refresh' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_refresh_stats' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_reguid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_relabel_disk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_reopen_one' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_set_bootenv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_set_prop' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_skip_pool' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_vdev_attach' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_vdev_clear' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_vdev_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zpool_vdev_online' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zpool_vdev_path_to_guid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zprop_expand_list' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='zprop_free_list' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zprop_index_to_string' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	<elf-symbol name='zprop_name_to_prop' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	- <var-decl name='avl_child' type-id='type-id-84' visibility='default' filepath='../../include/sys/avl_impl.h' line='91' column='1'/>
	+ <data-member access='private'>
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	- <var-decl name='avl_pcb' type-id='type-id-85' visibility='default' filepath='../../include/sys/avl_impl.h' line='92' column='1'/>
	+ <data-member access='private'>
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	- <subrange length='2' type-id='type-id-48' id='type-id-86'/>
	-
	+ </union-decl>
	+ <typedef-decl name='SHA256_CTX' type-id='2aec903e' id='1ef7fe01'/>
	+ <typedef-decl name='SHA384_CTX' type-id='2aec903e' id='139bfea5'/>
	+ <typedef-decl name='SHA512_CTX' type-id='2aec903e' id='33c643d0'/>
	+ <pointer-type-def type-id='1ef7fe01' size-in-bits='64' id='aacf5386'/>
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	+ <pointer-type-def type-id='33c643d0' size-in-bits='64' id='ceba8189'/>
	+ <function-decl name='SHA2Init' mangled-name='SHA2Init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='SHA2Init'>
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	+ <parameter type-id='5d626b03' name='ctx'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='SHA256Init' mangled-name='SHA256Init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='SHA256Init'>
	+ <parameter type-id='aacf5386' name='ctx'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='SHA384Init' mangled-name='SHA384Init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='SHA384Init'>
	+ <parameter type-id='074c43fa' name='ctx'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='SHA512Init' mangled-name='SHA512Init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='SHA512Init'>
	+ <parameter type-id='ceba8189' name='ctx'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='SHA2Update' mangled-name='SHA2Update' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='SHA2Update'>
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	+ <parameter type-id='eaa32e2f' name='inptr'/>
	+ <parameter type-id='b59d7dce' name='input_len'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='SHA2Final' mangled-name='SHA2Final' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='SHA2Final'>
	+ <parameter type-id='eaa32e2f' name='digest'/>
	+ <parameter type-id='5d626b03' name='ctx'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
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	+ </function-decl>
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	+ <function-decl name='cityhash4' mangled-name='cityhash4' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='cityhash4'>
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	- <class-decl name='re_pattern_buffer' size-in-bits='512' is-struct='yes' visibility='default' filepath='/usr/include/regex.h' line='413' column='1' id='type-id-88'>
	+ <typedef-decl name='zfeature_info_t' type-id='1178d146' id='83f29ca2'/>
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	- <var-decl name='buffer' type-id='type-id-89' visibility='default' filepath='/usr/include/regex.h' line='417' column='1'/>
	+ <var-decl name='fi_feature' type-id='d6618c78' visibility='default'/>
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	- <var-decl name='allocated' type-id='type-id-90' visibility='default' filepath='/usr/include/regex.h' line='420' column='1'/>
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	- <var-decl name='used' type-id='type-id-90' visibility='default' filepath='/usr/include/regex.h' line='423' column='1'/>
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	- <var-decl name='syntax' type-id='type-id-91' visibility='default' filepath='/usr/include/regex.h' line='426' column='1'/>
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	- <var-decl name='fastmap' type-id='type-id-23' visibility='default' filepath='/usr/include/regex.h' line='431' column='1'/>
	+ <var-decl name='fi_flags' type-id='fc329033' visibility='default'/>
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	- <var-decl name='translate' type-id='type-id-92' visibility='default' filepath='/usr/include/regex.h' line='437' column='1'/>
	+ <var-decl name='fi_type' type-id='732d2bb2' visibility='default'/>
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	- <var-decl name='re_nsub' type-id='type-id-43' visibility='default' filepath='/usr/include/regex.h' line='440' column='1'/>
	+ <var-decl name='fi_depends' type-id='1acff326' visibility='default'/>
	+ </data-member>
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	+ <typedef-decl name='zfeature_flags_t' type-id='6db816a4' id='fc329033'/>
	+ <enum-decl name='zfeature_flags' id='6db816a4'>
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	+ </enum-decl>
	+ <typedef-decl name='zfeature_type_t' type-id='c4fa2355' id='732d2bb2'/>
	+ <enum-decl name='zfeature_type' id='c4fa2355'>
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	+ <enumerator name='ZFEATURE_NUM_TYPES' value='2'/>
	+ </enum-decl>
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	+ <pointer-type-def type-id='81a65028' size-in-bits='64' id='1acff326'/>
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	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
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	+ <parameter type-id='d6618c78' name='fid'/>
	+ <parameter type-id='d6618c78' name='check'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_mod_supported' mangled-name='zfs_mod_supported' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_mod_supported'>
	+ <parameter type-id='80f4b756' name='scope'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
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	+ <var-decl name='zfeature_checks_disable' type-id='c19b74c3' mangled-name='zfeature_checks_disable' visibility='default' elf-symbol-id='zfeature_checks_disable'/>
	+ <typedef-decl name='spa_feature_t' type-id='33ecb627' id='d6618c78'/>
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	+ <enumerator name='SPA_FEATURE_ENABLED_TXG' value='5'/>
	+ <enumerator name='SPA_FEATURE_HOLE_BIRTH' value='6'/>
	+ <enumerator name='SPA_FEATURE_EXTENSIBLE_DATASET' value='7'/>
	+ <enumerator name='SPA_FEATURE_EMBEDDED_DATA' value='8'/>
	+ <enumerator name='SPA_FEATURE_BOOKMARKS' value='9'/>
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	+ <enumerator name='SPA_FEATURE_LARGE_DNODE' value='12'/>
	+ <enumerator name='SPA_FEATURE_SHA512' value='13'/>
	+ <enumerator name='SPA_FEATURE_SKEIN' value='14'/>
	+ <enumerator name='SPA_FEATURE_EDONR' value='15'/>
	+ <enumerator name='SPA_FEATURE_USEROBJ_ACCOUNTING' value='16'/>
	+ <enumerator name='SPA_FEATURE_ENCRYPTION' value='17'/>
	+ <enumerator name='SPA_FEATURE_PROJECT_QUOTA' value='18'/>
	+ <enumerator name='SPA_FEATURE_DEVICE_REMOVAL' value='19'/>
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	+ <enumerator name='SPA_FEATURE_LOG_SPACEMAP' value='29'/>
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	+ <enumerator name='SPA_FEATURE_DRAID' value='33'/>
	+ <enumerator name='SPA_FEATURES' value='34'/>
	+ </enum-decl>
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	+ <enumerator name='ZFS_DELEG_GROUP_SETS' value='71'/>
	+ <enumerator name='ZFS_DELEG_EVERYONE' value='101'/>
	+ <enumerator name='ZFS_DELEG_EVERYONE_SETS' value='69'/>
	+ <enumerator name='ZFS_DELEG_CREATE' value='99'/>
	+ <enumerator name='ZFS_DELEG_CREATE_SETS' value='67'/>
	+ <enumerator name='ZFS_DELEG_NAMED_SET' value='115'/>
	+ <enumerator name='ZFS_DELEG_NAMED_SET_SETS' value='83'/>
	+ </enum-decl>
	+ <typedef-decl name='zfs_deleg_perm_tab_t' type-id='5aa05c1f' id='f3f851ad'/>
	+ <class-decl name='zfs_deleg_perm_tab' size-in-bits='128' is-struct='yes' visibility='default' id='5aa05c1f'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='z_perm' type-id='26a90f95' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='z_note' type-id='4613c173' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='zfs_deleg_note_t' type-id='40ed39d3' id='4613c173'/>
	+ <enum-decl name='__anonymous_enum__1' is-anonymous='yes' id='40ed39d3'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='ZFS_DELEG_NOTE_CREATE' value='0'/>
	+ <enumerator name='ZFS_DELEG_NOTE_DESTROY' value='1'/>
	+ <enumerator name='ZFS_DELEG_NOTE_SNAPSHOT' value='2'/>
	+ <enumerator name='ZFS_DELEG_NOTE_ROLLBACK' value='3'/>
	+ <enumerator name='ZFS_DELEG_NOTE_CLONE' value='4'/>
	+ <enumerator name='ZFS_DELEG_NOTE_PROMOTE' value='5'/>
	+ <enumerator name='ZFS_DELEG_NOTE_RENAME' value='6'/>
	+ <enumerator name='ZFS_DELEG_NOTE_SEND' value='7'/>
	+ <enumerator name='ZFS_DELEG_NOTE_RECEIVE' value='8'/>
	+ <enumerator name='ZFS_DELEG_NOTE_ALLOW' value='9'/>
	+ <enumerator name='ZFS_DELEG_NOTE_USERPROP' value='10'/>
	+ <enumerator name='ZFS_DELEG_NOTE_MOUNT' value='11'/>
	+ <enumerator name='ZFS_DELEG_NOTE_SHARE' value='12'/>
	+ <enumerator name='ZFS_DELEG_NOTE_USERQUOTA' value='13'/>
	+ <enumerator name='ZFS_DELEG_NOTE_GROUPQUOTA' value='14'/>
	+ <enumerator name='ZFS_DELEG_NOTE_USERUSED' value='15'/>
	+ <enumerator name='ZFS_DELEG_NOTE_GROUPUSED' value='16'/>
	+ <enumerator name='ZFS_DELEG_NOTE_USEROBJQUOTA' value='17'/>
	+ <enumerator name='ZFS_DELEG_NOTE_GROUPOBJQUOTA' value='18'/>
	+ <enumerator name='ZFS_DELEG_NOTE_USEROBJUSED' value='19'/>
	+ <enumerator name='ZFS_DELEG_NOTE_GROUPOBJUSED' value='20'/>
	+ <enumerator name='ZFS_DELEG_NOTE_HOLD' value='21'/>
	+ <enumerator name='ZFS_DELEG_NOTE_RELEASE' value='22'/>
	+ <enumerator name='ZFS_DELEG_NOTE_DIFF' value='23'/>
	+ <enumerator name='ZFS_DELEG_NOTE_BOOKMARK' value='24'/>
	+ <enumerator name='ZFS_DELEG_NOTE_LOAD_KEY' value='25'/>
	+ <enumerator name='ZFS_DELEG_NOTE_CHANGE_KEY' value='26'/>
	+ <enumerator name='ZFS_DELEG_NOTE_PROJECTUSED' value='27'/>
	+ <enumerator name='ZFS_DELEG_NOTE_PROJECTQUOTA' value='28'/>
	+ <enumerator name='ZFS_DELEG_NOTE_PROJECTOBJUSED' value='29'/>
	+ <enumerator name='ZFS_DELEG_NOTE_PROJECTOBJQUOTA' value='30'/>
	+ <enumerator name='ZFS_DELEG_NOTE_NONE' value='31'/>
	+ </enum-decl>
	+ <function-decl name='zfs_deleg_canonicalize_perm' mangled-name='zfs_deleg_canonicalize_perm' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_deleg_canonicalize_perm'>
	+ <parameter type-id='80f4b756' name='perm'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zfs_deleg_verify_nvlist' mangled-name='zfs_deleg_verify_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_deleg_verify_nvlist'>
	+ <parameter type-id='5ce45b60' name='nvp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_deleg_whokey' mangled-name='zfs_deleg_whokey' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_deleg_whokey'>
	+ <parameter type-id='26a90f95' name='attr'/>
	+ <parameter type-id='36d4bd5a' name='type'/>
	+ <parameter type-id='a84c031d' name='inheritchr'/>
	+ <parameter type-id='eaa32e2f' name='data'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <var-decl name='zfs_deleg_perm_tab' type-id='3dd2cc5f' mangled-name='zfs_deleg_perm_tab' visibility='default' elf-symbol-id='zfs_deleg_perm_tab'/>
	+ <function-decl name='zfs_prop_delegatable' mangled-name='zfs_prop_delegatable' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_delegatable'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='permset_namecheck' mangled-name='permset_namecheck' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='permset_namecheck'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='053457bd'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <pointer-type-def type-id='8e0af06e' size-in-bits='64' id='053457bd'/>
	+ <typedef-decl name='zfs_prop_t' type-id='08f5ca19' id='58603c44'/>
	+ <enum-decl name='__anonymous_enum__' is-anonymous='yes' id='08f5ca19'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='ZPROP_CONT' value='-2'/>
	+ <enumerator name='ZPROP_INVAL' value='-1'/>
	+ <enumerator name='ZFS_PROP_TYPE' value='0'/>
	+ <enumerator name='ZFS_PROP_CREATION' value='1'/>
	+ <enumerator name='ZFS_PROP_USED' value='2'/>
	+ <enumerator name='ZFS_PROP_AVAILABLE' value='3'/>
	+ <enumerator name='ZFS_PROP_REFERENCED' value='4'/>
	+ <enumerator name='ZFS_PROP_COMPRESSRATIO' value='5'/>
	+ <enumerator name='ZFS_PROP_MOUNTED' value='6'/>
	+ <enumerator name='ZFS_PROP_ORIGIN' value='7'/>
	+ <enumerator name='ZFS_PROP_QUOTA' value='8'/>
	+ <enumerator name='ZFS_PROP_RESERVATION' value='9'/>
	+ <enumerator name='ZFS_PROP_VOLSIZE' value='10'/>
	+ <enumerator name='ZFS_PROP_VOLBLOCKSIZE' value='11'/>
	+ <enumerator name='ZFS_PROP_RECORDSIZE' value='12'/>
	+ <enumerator name='ZFS_PROP_MOUNTPOINT' value='13'/>
	+ <enumerator name='ZFS_PROP_SHARENFS' value='14'/>
	+ <enumerator name='ZFS_PROP_CHECKSUM' value='15'/>
	+ <enumerator name='ZFS_PROP_COMPRESSION' value='16'/>
	+ <enumerator name='ZFS_PROP_ATIME' value='17'/>
	+ <enumerator name='ZFS_PROP_DEVICES' value='18'/>
	+ <enumerator name='ZFS_PROP_EXEC' value='19'/>
	+ <enumerator name='ZFS_PROP_SETUID' value='20'/>
	+ <enumerator name='ZFS_PROP_READONLY' value='21'/>
	+ <enumerator name='ZFS_PROP_ZONED' value='22'/>
	+ <enumerator name='ZFS_PROP_SNAPDIR' value='23'/>
	+ <enumerator name='ZFS_PROP_ACLMODE' value='24'/>
	+ <enumerator name='ZFS_PROP_ACLINHERIT' value='25'/>
	+ <enumerator name='ZFS_PROP_CREATETXG' value='26'/>
	+ <enumerator name='ZFS_PROP_NAME' value='27'/>
	+ <enumerator name='ZFS_PROP_CANMOUNT' value='28'/>
	+ <enumerator name='ZFS_PROP_ISCSIOPTIONS' value='29'/>
	+ <enumerator name='ZFS_PROP_XATTR' value='30'/>
	+ <enumerator name='ZFS_PROP_NUMCLONES' value='31'/>
	+ <enumerator name='ZFS_PROP_COPIES' value='32'/>
	+ <enumerator name='ZFS_PROP_VERSION' value='33'/>
	+ <enumerator name='ZFS_PROP_UTF8ONLY' value='34'/>
	+ <enumerator name='ZFS_PROP_NORMALIZE' value='35'/>
	+ <enumerator name='ZFS_PROP_CASE' value='36'/>
	+ <enumerator name='ZFS_PROP_VSCAN' value='37'/>
	+ <enumerator name='ZFS_PROP_NBMAND' value='38'/>
	+ <enumerator name='ZFS_PROP_SHARESMB' value='39'/>
	+ <enumerator name='ZFS_PROP_REFQUOTA' value='40'/>
	+ <enumerator name='ZFS_PROP_REFRESERVATION' value='41'/>
	+ <enumerator name='ZFS_PROP_GUID' value='42'/>
	+ <enumerator name='ZFS_PROP_PRIMARYCACHE' value='43'/>
	+ <enumerator name='ZFS_PROP_SECONDARYCACHE' value='44'/>
	+ <enumerator name='ZFS_PROP_USEDSNAP' value='45'/>
	+ <enumerator name='ZFS_PROP_USEDDS' value='46'/>
	+ <enumerator name='ZFS_PROP_USEDCHILD' value='47'/>
	+ <enumerator name='ZFS_PROP_USEDREFRESERV' value='48'/>
	+ <enumerator name='ZFS_PROP_USERACCOUNTING' value='49'/>
	+ <enumerator name='ZFS_PROP_STMF_SHAREINFO' value='50'/>
	+ <enumerator name='ZFS_PROP_DEFER_DESTROY' value='51'/>
	+ <enumerator name='ZFS_PROP_USERREFS' value='52'/>
	+ <enumerator name='ZFS_PROP_LOGBIAS' value='53'/>
	+ <enumerator name='ZFS_PROP_UNIQUE' value='54'/>
	+ <enumerator name='ZFS_PROP_OBJSETID' value='55'/>
	+ <enumerator name='ZFS_PROP_DEDUP' value='56'/>
	+ <enumerator name='ZFS_PROP_MLSLABEL' value='57'/>
	+ <enumerator name='ZFS_PROP_SYNC' value='58'/>
	+ <enumerator name='ZFS_PROP_DNODESIZE' value='59'/>
	+ <enumerator name='ZFS_PROP_REFRATIO' value='60'/>
	+ <enumerator name='ZFS_PROP_WRITTEN' value='61'/>
	+ <enumerator name='ZFS_PROP_CLONES' value='62'/>
	+ <enumerator name='ZFS_PROP_LOGICALUSED' value='63'/>
	+ <enumerator name='ZFS_PROP_LOGICALREFERENCED' value='64'/>
	+ <enumerator name='ZFS_PROP_INCONSISTENT' value='65'/>
	+ <enumerator name='ZFS_PROP_VOLMODE' value='66'/>
	+ <enumerator name='ZFS_PROP_FILESYSTEM_LIMIT' value='67'/>
	+ <enumerator name='ZFS_PROP_SNAPSHOT_LIMIT' value='68'/>
	+ <enumerator name='ZFS_PROP_FILESYSTEM_COUNT' value='69'/>
	+ <enumerator name='ZFS_PROP_SNAPSHOT_COUNT' value='70'/>
	+ <enumerator name='ZFS_PROP_SNAPDEV' value='71'/>
	+ <enumerator name='ZFS_PROP_ACLTYPE' value='72'/>
	+ <enumerator name='ZFS_PROP_SELINUX_CONTEXT' value='73'/>
	+ <enumerator name='ZFS_PROP_SELINUX_FSCONTEXT' value='74'/>
	+ <enumerator name='ZFS_PROP_SELINUX_DEFCONTEXT' value='75'/>
	+ <enumerator name='ZFS_PROP_SELINUX_ROOTCONTEXT' value='76'/>
	+ <enumerator name='ZFS_PROP_RELATIME' value='77'/>
	+ <enumerator name='ZFS_PROP_REDUNDANT_METADATA' value='78'/>
	+ <enumerator name='ZFS_PROP_OVERLAY' value='79'/>
	+ <enumerator name='ZFS_PROP_PREV_SNAP' value='80'/>
	+ <enumerator name='ZFS_PROP_RECEIVE_RESUME_TOKEN' value='81'/>
	+ <enumerator name='ZFS_PROP_ENCRYPTION' value='82'/>
	+ <enumerator name='ZFS_PROP_KEYLOCATION' value='83'/>
	+ <enumerator name='ZFS_PROP_KEYFORMAT' value='84'/>
	+ <enumerator name='ZFS_PROP_PBKDF2_SALT' value='85'/>
	+ <enumerator name='ZFS_PROP_PBKDF2_ITERS' value='86'/>
	+ <enumerator name='ZFS_PROP_ENCRYPTION_ROOT' value='87'/>
	+ <enumerator name='ZFS_PROP_KEY_GUID' value='88'/>
	+ <enumerator name='ZFS_PROP_KEYSTATUS' value='89'/>
	+ <enumerator name='ZFS_PROP_REMAPTXG' value='90'/>
	+ <enumerator name='ZFS_PROP_SPECIAL_SMALL_BLOCKS' value='91'/>
	+ <enumerator name='ZFS_PROP_IVSET_GUID' value='92'/>
	+ <enumerator name='ZFS_PROP_REDACTED' value='93'/>
	+ <enumerator name='ZFS_PROP_REDACT_SNAPS' value='94'/>
	+ <enumerator name='ZFS_NUM_PROPS' value='95'/>
	+ </enum-decl>
	+ <typedef-decl name='namecheck_err_t' type-id='3eed36ac' id='8e0af06e'/>
	+ <enum-decl name='__anonymous_enum__3' is-anonymous='yes' id='3eed36ac'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='NAME_ERR_LEADING_SLASH' value='0'/>
	+ <enumerator name='NAME_ERR_EMPTY_COMPONENT' value='1'/>
	+ <enumerator name='NAME_ERR_TRAILING_SLASH' value='2'/>
	+ <enumerator name='NAME_ERR_INVALCHAR' value='3'/>
	+ <enumerator name='NAME_ERR_MULTIPLE_DELIMITERS' value='4'/>
	+ <enumerator name='NAME_ERR_NOLETTER' value='5'/>
	+ <enumerator name='NAME_ERR_RESERVED' value='6'/>
	+ <enumerator name='NAME_ERR_DISKLIKE' value='7'/>
	+ <enumerator name='NAME_ERR_TOOLONG' value='8'/>
	+ <enumerator name='NAME_ERR_SELF_REF' value='9'/>
	+ <enumerator name='NAME_ERR_PARENT_REF' value='10'/>
	+ <enumerator name='NAME_ERR_NO_AT' value='11'/>
	+ <enumerator name='NAME_ERR_NO_POUND' value='12'/>
	+ </enum-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zfs_fletcher.c' language='LANG_C89'>
	+ <array-type-def dimensions='1' type-id='90dbb6d6' size-in-bits='2048' id='16582e69'>
	+ <subrange length='4' type-id='4c87fef4' id='16fe7105'/>
	+ </array-type-def>
	+ <array-type-def dimensions='1' type-id='8240361c' size-in-bits='1024' id='481f90b1'>
	+ <subrange length='4' type-id='4c87fef4' id='16fe7105'/>
	+ </array-type-def>
	+ <array-type-def dimensions='1' type-id='7c1ab40c' size-in-bits='512' id='cbd91ec1'>
	+ <subrange length='4' type-id='4c87fef4' id='16fe7105'/>
	+ </array-type-def>
	+ <array-type-def dimensions='1' type-id='6d059eaa' size-in-bits='1024' id='729b6ebb'>
	+ <subrange length='4' type-id='4c87fef4' id='16fe7105'/>
	+ </array-type-def>
	+ <typedef-decl name='zio_abd_checksum_func_t' type-id='3f8e8d11' id='c2eb138a'/>
	+ <class-decl name='zio_abd_checksum_func' size-in-bits='192' is-struct='yes' visibility='default' id='aa14691a'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='acf_init' type-id='0bcca125' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='acf_fini' type-id='bfe36153' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='acf_iter' type-id='1e276399' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='zio_abd_checksum_init_t' type-id='a5444274' id='029a8ebe'/>
	+ <typedef-decl name='zio_abd_checksum_data_t' type-id='4bf4b004' id='74e39470'/>
	+ <class-decl name='zio_abd_checksum_data' size-in-bits='256' is-struct='yes' visibility='default' id='4bf4b004'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='acd_byteorder' type-id='595a65ec' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='acd_ctx' type-id='0f7df99e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='acd_zcp' type-id='c24fc2ee' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='acd_private' type-id='eaa32e2f' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='zio_byteorder_t' type-id='08f5ca1a' id='595a65ec'/>
	+ <enum-decl name='__anonymous_enum__' is-anonymous='yes' id='08f5ca1a'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='ZIO_CHECKSUM_NATIVE' value='0'/>
	+ <enumerator name='ZIO_CHECKSUM_BYTESWAP' value='1'/>
	+ </enum-decl>
	+ <typedef-decl name='fletcher_4_ctx_t' type-id='1f951ade' id='4b675395'/>
	+ <union-decl name='fletcher_4_ctx' size-in-bits='2048' visibility='default' id='1f951ade'>
	+ <data-member access='private'>
	+ <var-decl name='scalar' type-id='39730d0b' visibility='default'/>
	+ </data-member>
	+ <data-member access='private'>
	+ <var-decl name='superscalar' type-id='729b6ebb' visibility='default'/>
	+ </data-member>
	+ <data-member access='private'>
	+ <var-decl name='sse' type-id='cbd91ec1' visibility='default'/>
	+ </data-member>
	+ <data-member access='private'>
	+ <var-decl name='avx' type-id='481f90b1' visibility='default'/>
	+ </data-member>
	+ <data-member access='private'>
	+ <var-decl name='avx512' type-id='16582e69' visibility='default'/>
	+ </data-member>
	+ </union-decl>
	+ <typedef-decl name='zfs_fletcher_superscalar_t' type-id='28efb250' id='6d059eaa'/>
	+ <class-decl name='zfs_fletcher_superscalar' size-in-bits='256' is-struct='yes' visibility='default' id='28efb250'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='v' type-id='85c64d26' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='zfs_fletcher_sse_t' type-id='acd4019a' id='7c1ab40c'/>
	+ <class-decl name='zfs_fletcher_sse' size-in-bits='128' is-struct='yes' visibility='default' id='acd4019a'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='v' type-id='c1c22e6c' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='zfs_fletcher_avx_t' type-id='8c208dfa' id='8240361c'/>
	+ <class-decl name='zfs_fletcher_avx' size-in-bits='256' is-struct='yes' visibility='default' id='8c208dfa'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='v' type-id='85c64d26' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='zfs_fletcher_avx512_t' type-id='c6d0c382' id='90dbb6d6'/>
	+ <class-decl name='zfs_fletcher_avx512' size-in-bits='512' is-struct='yes' visibility='default' id='c6d0c382'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='v' type-id='c5d13f42' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='zio_abd_checksum_fini_t' type-id='a5444274' id='d6fd5c6c'/>
	+ <typedef-decl name='zio_abd_checksum_iter_t' type-id='f4a1892e' id='cefa0f4a'/>
	+ <qualified-type-def type-id='aa14691a' const='yes' id='3f8e8d11'/>
	+ <pointer-type-def type-id='4b675395' size-in-bits='64' id='0f7df99e'/>
	+ <qualified-type-def type-id='8f92235e' volatile='yes' id='430e0681'/>
	+ <pointer-type-def type-id='430e0681' size-in-bits='64' id='3a147f31'/>
	+ <pointer-type-def type-id='74e39470' size-in-bits='64' id='eefe7427'/>
	+ <pointer-type-def type-id='d6fd5c6c' size-in-bits='64' id='bfe36153'/>
	+ <pointer-type-def type-id='029a8ebe' size-in-bits='64' id='0bcca125'/>
	+ <pointer-type-def type-id='cefa0f4a' size-in-bits='64' id='1e276399'/>
	+ <function-decl name='fletcher_init' mangled-name='fletcher_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_init'>
	+ <parameter type-id='c24fc2ee' name='zcp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fletcher_2_incremental_native' mangled-name='fletcher_2_incremental_native' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_2_incremental_native'>
	+ <parameter type-id='eaa32e2f' name='buf'/>
	+ <parameter type-id='b59d7dce' name='size'/>
	+ <parameter type-id='eaa32e2f' name='data'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fletcher_2_native' mangled-name='fletcher_2_native' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_2_native'>
	+ <parameter type-id='eaa32e2f' name='buf'/>
	+ <parameter type-id='9c313c2d' name='size'/>
	+ <parameter type-id='eaa32e2f' name='ctx_template'/>
	+ <parameter type-id='c24fc2ee' name='zcp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fletcher_2_incremental_byteswap' mangled-name='fletcher_2_incremental_byteswap' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_2_incremental_byteswap'>
	+ <parameter type-id='eaa32e2f' name='buf'/>
	+ <parameter type-id='b59d7dce' name='size'/>
	+ <parameter type-id='eaa32e2f' name='data'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fletcher_2_byteswap' mangled-name='fletcher_2_byteswap' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_2_byteswap'>
	+ <parameter type-id='eaa32e2f' name='buf'/>
	+ <parameter type-id='9c313c2d' name='size'/>
	+ <parameter type-id='eaa32e2f' name='ctx_template'/>
	+ <parameter type-id='c24fc2ee' name='zcp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fletcher_4_impl_set' mangled-name='fletcher_4_impl_set' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_impl_set'>
	+ <parameter type-id='80f4b756' name='val'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fletcher_4_native' mangled-name='fletcher_4_native' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_native'>
	+ <parameter type-id='eaa32e2f' name='buf'/>
	+ <parameter type-id='9c313c2d' name='size'/>
	+ <parameter type-id='eaa32e2f' name='ctx_template'/>
	+ <parameter type-id='c24fc2ee' name='zcp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fletcher_4_byteswap' mangled-name='fletcher_4_byteswap' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_byteswap'>
	+ <parameter type-id='eaa32e2f' name='buf'/>
	+ <parameter type-id='9c313c2d' name='size'/>
	+ <parameter type-id='eaa32e2f' name='ctx_template'/>
	+ <parameter type-id='c24fc2ee' name='zcp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <var-decl name='fletcher_4_abd_ops' type-id='c2eb138a' mangled-name='fletcher_4_abd_ops' visibility='default' elf-symbol-id='fletcher_4_abd_ops'/>
	+ <function-decl name='atomic_swap_32' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3a147f31'/>
	+ <parameter type-id='8f92235e'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='membar_producer' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-type size-in-bits='64' id='f4a1892e'>
	+ <parameter type-id='eaa32e2f' name='buf'/>
	+ <parameter type-id='b59d7dce' name='size'/>
	+ <parameter type-id='eaa32e2f' name='data'/>
	+ <return type-id='95e97e5e'/>
	+ </function-type>
	+ <function-type size-in-bits='64' id='a5444274'>
	+ <parameter type-id='eefe7427'/>
	+ <return type-id='48b5725f'/>
	+ </function-type>
	+ <typedef-decl name='zio_cksum_t' type-id='1d53e28b' id='39730d0b'/>
	+ <array-type-def dimensions='1' type-id='9c313c2d' size-in-bits='256' id='85c64d26'>
	+ <subrange length='4' type-id='4c87fef4' id='16fe7105'/>
	+ </array-type-def>
	+ <pointer-type-def type-id='39730d0b' size-in-bits='64' id='c24fc2ee'/>
	+ <class-decl name='zio_cksum' size-in-bits='256' is-struct='yes' visibility='default' id='1d53e28b'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='zc_word' type-id='85c64d26' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zfs_fletcher_avx512.c' language='LANG_C89'>
	+ <typedef-decl name='fletcher_4_ops_t' type-id='57f479a0' id='eba91718'/>
	+ <class-decl name='fletcher_4_func' size-in-bits='512' is-struct='yes' visibility='default' id='57f479a0'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='init_native' type-id='b9ae1656' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='fini_native' type-id='c4c1f4fc' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='compute_native' type-id='ad1dc4cb' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='init_byteswap' type-id='b9ae1656' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='256'>
	+ <var-decl name='fini_byteswap' type-id='c4c1f4fc' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='320'>
	+ <var-decl name='compute_byteswap' type-id='ad1dc4cb' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='384'>
	+ <var-decl name='valid' type-id='297d38bc' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='448'>
	+ <var-decl name='name' type-id='80f4b756' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='fletcher_4_init_f' type-id='173aa527' id='b9ae1656'/>
	+ <typedef-decl name='fletcher_4_fini_f' type-id='0ad5b8a8' id='c4c1f4fc'/>
	+ <typedef-decl name='fletcher_4_compute_f' type-id='38147eff' id='ad1dc4cb'/>
	+ <qualified-type-def type-id='eba91718' const='yes' id='9eeabdc8'/>
	+ <pointer-type-def type-id='e9e61702' size-in-bits='64' id='297d38bc'/>
	+ <pointer-type-def type-id='fe40251b' size-in-bits='64' id='173aa527'/>
	+ <pointer-type-def type-id='17fb1f83' size-in-bits='64' id='38147eff'/>
	+ <pointer-type-def type-id='fb39e25e' size-in-bits='64' id='0ad5b8a8'/>
	+ <var-decl name='fletcher_4_avx512f_ops' type-id='9eeabdc8' mangled-name='fletcher_4_avx512f_ops' visibility='default' elf-symbol-id='fletcher_4_avx512f_ops'/>
	+ <var-decl name='fletcher_4_avx512bw_ops' type-id='9eeabdc8' mangled-name='fletcher_4_avx512bw_ops' visibility='default' elf-symbol-id='fletcher_4_avx512bw_ops'/>
	+ <function-type size-in-bits='64' id='e9e61702'>
	+ <return type-id='c19b74c3'/>
	+ </function-type>
	+ <function-type size-in-bits='64' id='fe40251b'>
	+ <parameter type-id='0f7df99e'/>
	+ <return type-id='48b5725f'/>
	+ </function-type>
	+ <function-type size-in-bits='64' id='17fb1f83'>
	+ <parameter type-id='0f7df99e'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='9c313c2d'/>
	+ <return type-id='48b5725f'/>
	+ </function-type>
	+ <function-type size-in-bits='64' id='fb39e25e'>
	+ <parameter type-id='0f7df99e'/>
	+ <parameter type-id='c24fc2ee'/>
	+ <return type-id='48b5725f'/>
	+ </function-type>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zfs_fletcher_intel.c' language='LANG_C89'>
	+ <var-decl name='fletcher_4_avx2_ops' type-id='9eeabdc8' mangled-name='fletcher_4_avx2_ops' visibility='default' elf-symbol-id='fletcher_4_avx2_ops'/>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zfs_fletcher_sse.c' language='LANG_C89'>
	+ <var-decl name='fletcher_4_sse2_ops' type-id='9eeabdc8' mangled-name='fletcher_4_sse2_ops' visibility='default' elf-symbol-id='fletcher_4_sse2_ops'/>
	+ <var-decl name='fletcher_4_ssse3_ops' type-id='9eeabdc8' mangled-name='fletcher_4_ssse3_ops' visibility='default' elf-symbol-id='fletcher_4_ssse3_ops'/>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zfs_fletcher_superscalar.c' language='LANG_C89'>
	+ <var-decl name='fletcher_4_superscalar_ops' type-id='9eeabdc8' mangled-name='fletcher_4_superscalar_ops' visibility='default' elf-symbol-id='fletcher_4_superscalar_ops'/>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zfs_fletcher_superscalar4.c' language='LANG_C89'>
	+ <var-decl name='fletcher_4_superscalar4_ops' type-id='9eeabdc8' mangled-name='fletcher_4_superscalar4_ops' visibility='default' elf-symbol-id='fletcher_4_superscalar4_ops'/>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zfs_namecheck.c' language='LANG_C89'>
	+ <function-decl name='get_dataset_depth' mangled-name='get_dataset_depth' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='get_dataset_depth'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_component_namecheck' mangled-name='zfs_component_namecheck' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_component_namecheck'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='053457bd' name='why'/>
	+ <parameter type-id='26a90f95' name='what'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='dataset_namecheck' mangled-name='dataset_namecheck' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='dataset_namecheck'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='053457bd' name='why'/>
	+ <parameter type-id='26a90f95' name='what'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='bookmark_namecheck' mangled-name='bookmark_namecheck' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='bookmark_namecheck'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='053457bd' name='why'/>
	+ <parameter type-id='26a90f95' name='what'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='snapshot_namecheck' mangled-name='snapshot_namecheck' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='snapshot_namecheck'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='053457bd' name='why'/>
	+ <parameter type-id='26a90f95' name='what'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <var-decl name='zfs_max_dataset_nesting' type-id='95e97e5e' mangled-name='zfs_max_dataset_nesting' visibility='default' elf-symbol-id='zfs_max_dataset_nesting'/>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zfs_prop.c' language='LANG_C89'>
	+ <array-type-def dimensions='1' type-id='80f4b756' size-in-bits='768' id='35e4b367'>
	+ <subrange length='12' type-id='4c87fef4' id='84827bdc'/>
	+ </array-type-def>
	+ <function-decl name='zfs_prop_string_to_index' mangled-name='zfs_prop_string_to_index' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_string_to_index'>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <parameter type-id='80f4b756' name='string'/>
	+ <parameter type-id='5d6479ae' name='index'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_random_value' mangled-name='zfs_prop_random_value' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_random_value'>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <parameter type-id='9c313c2d' name='seed'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_visible' mangled-name='zfs_prop_visible' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_visible'>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_values' mangled-name='zfs_prop_values' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_values'>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_is_string' mangled-name='zfs_prop_is_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_is_string'>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_column_name' mangled-name='zfs_prop_column_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_column_name'>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_align_right' mangled-name='zfs_prop_align_right' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_align_right'>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <var-decl name='zfs_userquota_prop_prefixes' type-id='35e4b367' mangled-name='zfs_userquota_prop_prefixes' visibility='default' elf-symbol-id='zfs_userquota_prop_prefixes'/>
	+ <function-decl name='zprop_register_index' mangled-name='zprop_register_index' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_register_index'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='999701cc'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='c8bc397b'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zprop_register_string' mangled-name='zprop_register_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_register_string'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='999701cc'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zprop_register_number' mangled-name='zprop_register_number' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_register_number'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='999701cc'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zprop_register_hidden' mangled-name='zprop_register_hidden' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_register_hidden'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='31429eff'/>
	+ <parameter type-id='999701cc'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zprop_register_impl' mangled-name='zprop_register_impl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_register_impl'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='31429eff'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='999701cc'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='c19b74c3'/>
	+ <parameter type-id='c19b74c3'/>
	+ <parameter type-id='c8bc397b'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zprop_index_to_string' mangled-name='zprop_index_to_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_index_to_string'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='7d3cd834'/>
	+ <parameter type-id='2e45de5d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zprop_random_value' mangled-name='zprop_random_value' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_random_value'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='2e45de5d'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <pointer-type-def type-id='80f4b756' size-in-bits='64' id='7d3cd834'/>
	+ <pointer-type-def type-id='072f7953' size-in-bits='64' id='c8bc397b'/>
	+ <typedef-decl name='zfs_type_t' type-id='3eed36ad' id='2e45de5d'/>
	+ <typedef-decl name='zprop_attr_t' type-id='40ed39d4' id='999701cc'/>
	+ <typedef-decl name='zprop_type_t' type-id='3fed383f' id='31429eff'/>
	+ <pointer-type-def type-id='9c313c2d' size-in-bits='64' id='5d6479ae'/>
	+ <qualified-type-def type-id='64636ce3' const='yes' id='072f7953'/>
	+ <enum-decl name='__anonymous_enum__1' is-anonymous='yes' id='40ed39d4'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='PROP_DEFAULT' value='0'/>
	+ <enumerator name='PROP_READONLY' value='1'/>
	+ <enumerator name='PROP_INHERIT' value='2'/>
	+ <enumerator name='PROP_ONETIME' value='3'/>
	+ <enumerator name='PROP_ONETIME_DEFAULT' value='4'/>
	+ </enum-decl>
	+ <enum-decl name='__anonymous_enum__2' is-anonymous='yes' id='3fed383f'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='PROP_TYPE_NUMBER' value='0'/>
	+ <enumerator name='PROP_TYPE_STRING' value='1'/>
	+ <enumerator name='PROP_TYPE_INDEX' value='2'/>
	+ </enum-decl>
	+ <enum-decl name='__anonymous_enum__3' is-anonymous='yes' id='3eed36ad'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='ZFS_TYPE_FILESYSTEM' value='1'/>
	+ <enumerator name='ZFS_TYPE_SNAPSHOT' value='2'/>
	+ <enumerator name='ZFS_TYPE_VOLUME' value='4'/>
	+ <enumerator name='ZFS_TYPE_POOL' value='8'/>
	+ <enumerator name='ZFS_TYPE_BOOKMARK' value='16'/>
	+ </enum-decl>
	+ <typedef-decl name='zprop_index_t' type-id='87957af9' id='64636ce3'/>
	+ <class-decl name='zfs_index' size-in-bits='128' is-struct='yes' visibility='default' id='87957af9'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='pi_name' type-id='80f4b756' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='pi_value' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zpool_prop.c' language='LANG_C89'>
	+ <function-decl name='zpool_prop_string_to_index' mangled-name='zpool_prop_string_to_index' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_string_to_index'>
	+ <parameter type-id='5d0c23fb' name='prop'/>
	+ <parameter type-id='80f4b756' name='string'/>
	+ <parameter type-id='5d6479ae' name='index'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_random_value' mangled-name='zpool_prop_random_value' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_random_value'>
	+ <parameter type-id='5d0c23fb' name='prop'/>
	+ <parameter type-id='9c313c2d' name='seed'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_values' mangled-name='zpool_prop_values' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_values'>
	+ <parameter type-id='5d0c23fb' name='prop'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_column_name' mangled-name='zpool_prop_column_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_column_name'>
	+ <parameter type-id='5d0c23fb' name='prop'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_align_right' mangled-name='zpool_prop_align_right' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_align_right'>
	+ <parameter type-id='5d0c23fb' name='prop'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
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	+ <pointer-type-def type-id='a2256d42' size-in-bits='64' id='debc6aa3'/>
	+ <function-decl name='changelist_postfix' mangled-name='changelist_postfix' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_postfix'>
	+ <parameter type-id='0d41d328' name='clp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='changelist_prefix' mangled-name='changelist_prefix' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_prefix'>
	+ <parameter type-id='0d41d328' name='clp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='isa_child_of' mangled-name='isa_child_of' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='isa_child_of'>
	+ <parameter type-id='80f4b756' name='dataset'/>
	+ <parameter type-id='80f4b756' name='parent'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='changelist_rename' mangled-name='changelist_rename' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_rename'>
	+ <parameter type-id='0d41d328' name='clp'/>
	+ <parameter type-id='80f4b756' name='src'/>
	+ <parameter type-id='80f4b756' name='dst'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='changelist_unshare' mangled-name='changelist_unshare' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_unshare'>
	+ <parameter type-id='0d41d328' name='clp'/>
	+ <parameter type-id='bf9c30ee' name='proto'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='changelist_haszonedchild' mangled-name='changelist_haszonedchild' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_haszonedchild'>
	+ <parameter type-id='0d41d328' name='clp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='changelist_remove' mangled-name='changelist_remove' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_remove'>
	+ <parameter type-id='0d41d328' name='clp'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='changelist_free' mangled-name='changelist_free' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_free'>
	+ <parameter type-id='0d41d328' name='clp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='changelist_gather' mangled-name='changelist_gather' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_gather'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='58603c44' name='prop'/>
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	+ <return type-id='0d41d328'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get' mangled-name='zfs_prop_get' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='58603c44'/>
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	+ <parameter type-id='c19b74c3'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_handle' mangled-name='zfs_get_handle' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_handle'>
	+ <parameter type-id='9200a744'/>
	+ <return type-id='b0382bb3'/>
	+ </function-decl>
	+ <function-decl name='zfs_alloc' mangled-name='zfs_alloc' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_alloc'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='zfs_is_shared' mangled-name='zfs_is_shared' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_shared'>
	+ <parameter type-id='9200a744'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_int' mangled-name='zfs_prop_get_int' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_int'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='getzoneid' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='4da03624'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_node_init' visibility='default' binding='global' size-in-bits='64'>
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	+ <parameter type-id='2dc35b9d'/>
	+ <parameter type-id='de82c773'/>
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	+ <function-decl name='uu_avl_find' visibility='default' binding='global' size-in-bits='64'>
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	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='813a2225'/>
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	+ <function-decl name='free' visibility='default' binding='global' size-in-bits='64'>
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	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_is_mounted' mangled-name='zfs_is_mounted' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_mounted'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='9b23c9ad'/>
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	+ </function-decl>
	+ <function-decl name='zfs_iter_children' mangled-name='zfs_iter_children' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_iter_children'>
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	+ <parameter type-id='d8e49ab9'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='95e97e5e'/>
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	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='5d7f5fc8'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_close' mangled-name='zfs_close' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_close'>
	+ <parameter type-id='9200a744'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_refresh_properties' mangled-name='zfs_refresh_properties' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_refresh_properties'>
	+ <parameter type-id='9200a744'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshare_nfs' mangled-name='zfs_unshare_nfs' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshare_nfs'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshare_smb' mangled-name='zfs_unshare_smb' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshare_smb'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_mount' mangled-name='zfs_mount' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_mount'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_share_nfs' mangled-name='zfs_share_nfs' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_share_nfs'>
	+ <parameter type-id='9200a744'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_share_smb' mangled-name='zfs_share_smb' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_share_smb'>
	+ <parameter type-id='9200a744'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='uu_avl_last' visibility='default' binding='global' size-in-bits='64'>
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	+ <return type-id='5842d146'/>
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	+ <return type-id='eaa32e2f'/>
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	+ <function-decl name='uu_avl_walk_end' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5842d146'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_commit_nfs_shares' mangled-name='zfs_commit_nfs_shares' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_commit_nfs_shares'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_commit_smb_shares' mangled-name='zfs_commit_smb_shares' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_commit_smb_shares'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='remove_mountpoint' mangled-name='remove_mountpoint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='remove_mountpoint'>
	+ <parameter type-id='9200a744'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_unmount' mangled-name='zfs_unmount' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unmount'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='80f4b756'/>
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	+ </function-decl>
	+ <function-decl name='strlen' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='strncmp' visibility='default' binding='global' size-in-bits='64'>
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	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
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	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='strlcat' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshare_proto' mangled-name='zfs_unshare_proto' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshare_proto'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='bf9c30ee'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_commit_proto' mangled-name='zfs_commit_proto' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_commit_proto'>
	+ <parameter type-id='bf9c30ee'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
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	+ </function-decl>
	+ <function-decl name='uu_avl_pool_destroy' visibility='default' binding='global' size-in-bits='64'>
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	+ <function-decl name='zfs_iter_dependents' mangled-name='zfs_iter_dependents' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_iter_dependents'>
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	+ </function-decl>
	+ <function-decl name='zfs_get_name' mangled-name='zfs_get_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_name'>
	+ <parameter type-id='fcd57163'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zfs_open' mangled-name='zfs_open' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_open'>
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	+ <parameter type-id='80f4b756'/>
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	+ <return type-id='9200a744'/>
	+ </function-decl>
	+ <function-decl name='zfs_iter_mounted' mangled-name='zfs_iter_mounted' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_iter_mounted'>
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	+ </function-decl>
	+ <function-decl name='zfs_error' mangled-name='zfs_error' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_error'>
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	+ <var-decl name='c_ospeed' type-id='6a8e8a14' visibility='default'/>
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	+ <typedef-decl name='speed_t' type-id='f0981eeb' id='6a8e8a14'/>
	+ <typedef-decl name='zpool_prop_t' type-id='08f5ca1b' id='5d0c23fb'/>
	+ <enum-decl name='__anonymous_enum__' is-anonymous='yes' id='08f5ca1b'>
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	- <function-decl name='changelist_unshare' mangled-name='changelist_unshare' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_changelist.c' line='348' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='changelist_unshare'>
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	- <parameter type-id='type-id-107' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_changelist.c' line='348' column='1'/>
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	- <parameter type-id='type-id-104' name='parent' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_changelist.c' line='288' column='1'/>
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	- <function-decl name='getzoneid' mangled-name='getzoneid' filepath='../../include/sys/zfs_context.h' line='732' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='uu_avl_pool_destroy' mangled-name='uu_avl_pool_destroy' filepath='../../include/libuutil.h' line='336' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_unshare_proto' mangled-name='zfs_unshare_proto' filepath='../../include/libzfs_impl.h' line='211' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_commit_proto' mangled-name='zfs_commit_proto' filepath='../../include/libzfs_impl.h' line='260' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='remove_mountpoint' mangled-name='remove_mountpoint' filepath='../../include/libzfs_impl.h' line='192' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_unshare_smb' mangled-name='zfs_unshare_smb' filepath='../../include/libzfs.h' line='853' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_unshare_nfs' mangled-name='zfs_unshare_nfs' filepath='../../include/libzfs.h' line='852' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_share_smb' mangled-name='zfs_share_smb' filepath='../../include/libzfs.h' line='850' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_commit_nfs_shares' mangled-name='zfs_commit_nfs_shares' filepath='../../include/libzfs.h' line='861' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_commit_smb_shares' mangled-name='zfs_commit_smb_shares' filepath='../../include/libzfs.h' line='862' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_unmount' mangled-name='zfs_unmount' filepath='../../include/libzfs.h' line='827' column='1' visibility='default' binding='global' size-in-bits='64'>
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	+ <pointer-type-def type-id='ef70d893' size-in-bits='64' id='6e756877'/>
	+ <function-decl name='zfs_crypto_get_encryption_root' mangled-name='zfs_crypto_get_encryption_root' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_get_encryption_root'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='37e3bd22' name='is_encroot'/>
	+ <parameter type-id='26a90f95' name='buf'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_crypto_create' mangled-name='zfs_crypto_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_create'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='26a90f95' name='parent_name'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='5ce45b60' name='pool_props'/>
	+ <parameter type-id='c19b74c3' name='stdin_available'/>
	+ <parameter type-id='d8774064' name='wkeydata_out'/>
	+ <parameter type-id='4dd26a40' name='wkeylen_out'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_crypto_clone_check' mangled-name='zfs_crypto_clone_check' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_clone_check'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='9200a744' name='origin_zhp'/>
	+ <parameter type-id='26a90f95' name='parent_name'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_crypto_load_key' mangled-name='zfs_crypto_load_key' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_load_key'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='c19b74c3' name='noop'/>
	+ <parameter type-id='26a90f95' name='alt_keylocation'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_crypto_attempt_load_keys' mangled-name='zfs_crypto_attempt_load_keys' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_attempt_load_keys'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='26a90f95' name='fsname'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_crypto_unload_key' mangled-name='zfs_crypto_unload_key' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_unload_key'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_crypto_rewrap' mangled-name='zfs_crypto_rewrap' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_rewrap'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='5ce45b60' name='raw_props'/>
	+ <parameter type-id='c19b74c3' name='inheritkey'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_to_name' mangled-name='zfs_prop_to_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_to_name'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5d6479ae'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='__getdelim' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9b23c9ad'/>
	+ <parameter type-id='78c01427'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='822cd80b'/>
	+ <return type-id='41060289'/>
	+ </function-decl>
	+ <function-decl name='sigemptyset' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9e80f729'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='sigaction' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='9f68085b'/>
	+ <parameter type-id='568dd84e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='printf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fputc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='822cd80b'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fflush' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fileno' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='tcgetattr' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='665a4eda'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='tcsetattr' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='eaec840f'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='getpid' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='3629bad8'/>
	+ </function-decl>
	+ <function-decl name='kill' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3629bad8'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_error_aux' mangled-name='zfs_error_aux' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_error_aux'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='__ctype_b_loc' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='c59e1ef0'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_prop_int' mangled-name='zpool_get_prop_int' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_prop_int'>
	+ <parameter type-id='4c81de99'/>
	+ <parameter type-id='5d0c23fb'/>
	+ <parameter type-id='debc6aa3'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='malloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='fread' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='822cd80b'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='ferror' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='strerror' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='fclose' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='sscanf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='PKCS5_PBKDF2_HMAC_SHA1' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='354f7eb9'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='cf536864'/>
	+ <return type-id='95e97e5e'/>
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	+ <function-decl name='bcopy' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='48b5725f'/>
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	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='regexec' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eed6c816'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='7e2979d5'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='isatty' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='read' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='79a0948f'/>
	+ </function-decl>
	+ <function-decl name='close' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9c313c2d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='snprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_load_key' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='c19b74c3'/>
	+ <parameter type-id='ae3e8ca6'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_iter_filesystems' mangled-name='zfs_iter_filesystems' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_iter_filesystems'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='d8e49ab9'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_handle_dup' mangled-name='zfs_handle_dup' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_handle_dup'>
	+ <parameter type-id='9200a744'/>
	+ <return type-id='9200a744'/>
	+ </function-decl>
	+ <function-decl name='lzc_unload_key' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_name_to_prop' mangled-name='zfs_name_to_prop' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_name_to_prop'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='58603c44'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_alloc' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zfs_valid_proplist' mangled-name='zfs_valid_proplist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_valid_proplist'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='2e45de5d'/>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='9c313c2d'/>
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	+ <parameter type-id='4c81de99'/>
	+ <parameter type-id='c19b74c3'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zfs_parent_name' mangled-name='zfs_parent_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_parent_name'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_change_key' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='ae3e8ca6'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-type size-in-bits='64' id='ee076206'>
	+ <return type-id='48b5725f'/>
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	- </abi-instr>
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	- <function-decl name='zfs_iter_root' mangled-name='zfs_iter_root' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_config.c' line='434' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_iter_root'>
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	- <function-decl name='zpool_iter' mangled-name='zpool_iter' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_config.c' line='389' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_iter'>
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	- <function-decl name='zpool_skip_pool' mangled-name='zpool_skip_pool' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_config.c' line='340' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_skip_pool'>
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	- <function-decl name='zpool_get_config' mangled-name='zpool_get_config' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_config.c' line='220' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_config'>
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	- <function-decl name='namespace_clear' mangled-name='namespace_clear' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_config.c' line='79' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='namespace_clear'>
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	- <function-decl name='zcmd_alloc_dst_nvlist' mangled-name='zcmd_alloc_dst_nvlist' filepath='../../include/libzfs_impl.h' line='176' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='__errno_location' mangled-name='__errno_location' filepath='/usr/include/errno.h' line='37' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zcmd_expand_dst_nvlist' mangled-name='zcmd_expand_dst_nvlist' filepath='../../include/libzfs_impl.h' line='179' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_ioctl' mangled-name='zfs_ioctl' filepath='../../include/libzfs.h' line='455' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zcmd_read_dst_nvlist' mangled-name='zcmd_read_dst_nvlist' filepath='../../include/libzfs_impl.h' line='180' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zcmd_free_nvlists' mangled-name='zcmd_free_nvlists' filepath='../../include/libzfs_impl.h' line='181' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='nvlist_free' mangled-name='nvlist_free' filepath='../../include/sys/nvpair.h' line='152' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='nvlist_exists' mangled-name='nvlist_exists' filepath='../../include/sys/nvpair.h' line='238' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='nvlist_lookup_nvlist' mangled-name='nvlist_lookup_nvlist' filepath='../../include/sys/nvpair.h' line='214' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='no_memory' mangled-name='no_memory' filepath='../../include/libzfs_impl.h' line='143' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='nvlist_dup' mangled-name='nvlist_dup' filepath='../../include/sys/nvpair.h' line='156' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='nvpair_name' mangled-name='nvpair_name' filepath='../../include/sys/nvpair.h' line='244' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_strdup' mangled-name='zfs_strdup' filepath='../../include/libzfs_impl.h' line='142' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='nvpair_value_nvlist' mangled-name='nvpair_value_nvlist' filepath='../../include/sys/nvpair.h' line='258' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='dcgettext' mangled-name='dcgettext' filepath='/usr/include/libintl.h' line='51' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_standard_error' mangled-name='zfs_standard_error' filepath='../../include/libzfs_impl.h' line='145' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='uu_avl_teardown' mangled-name='uu_avl_teardown' filepath='../../include/libuutil.h' line='376' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='nvlist_next_nvpair' mangled-name='nvlist_next_nvpair' filepath='../../include/sys/nvpair.h' line='242' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <return type-id='type-id-6'/>
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	- <parameter type-id='type-id-42'/>
	- <return type-id='type-id-6'/>
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	+ <parameter type-id='185869c1'/>
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	- <abi-instr version='1.0' address-size='64' path='libzfs_crypto.c' comp-dir-path='/home/colm/src/zfs/zfs/lib/libzfs' language='LANG_C99'>
	- <function-decl name='zfs_crypto_rewrap' mangled-name='zfs_crypto_rewrap' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1387' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_rewrap'>
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	- <parameter type-id='type-id-22' name='raw_props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1387' column='1'/>
	- <parameter type-id='type-id-5' name='inheritkey' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1387' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_crypto_unload_key' mangled-name='zfs_crypto_unload_key' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1251' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_unload_key'>
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	- <function-decl name='zfs_crypto_load_key' mangled-name='zfs_crypto_load_key' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1083' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_load_key'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1083' column='1'/>
	- <parameter type-id='type-id-5' name='noop' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1083' column='1'/>
	- <parameter type-id='type-id-23' name='alt_keylocation' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1083' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_crypto_attempt_load_keys' mangled-name='zfs_crypto_attempt_load_keys' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1048' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_attempt_load_keys'>
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	- <parameter type-id='type-id-23' name='fsname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='1048' column='1'/>
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	- <function-decl name='zfs_crypto_clone_check' mangled-name='zfs_crypto_clone_check' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='982' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_clone_check'>
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	- <parameter type-id='type-id-102' name='origin_zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='982' column='1'/>
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	- <parameter type-id='type-id-5' name='stdin_available' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='811' column='1'/>
	- <parameter type-id='type-id-116' name='wkeydata_out' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='811' column='1'/>
	- <parameter type-id='type-id-118' name='wkeylen_out' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='812' column='1'/>
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	- <function-decl name='zfs_crypto_get_encryption_root' mangled-name='zfs_crypto_get_encryption_root' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='779' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_crypto_get_encryption_root'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='779' column='1'/>
	- <parameter type-id='type-id-114' name='is_encroot' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='779' column='1'/>
	- <parameter type-id='type-id-23' name='buf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_crypto.c' line='780' column='1'/>
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	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_error_aux' mangled-name='zfs_error_aux' filepath='../../include/libzfs_impl.h' line='138' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_valid_proplist' mangled-name='zfs_valid_proplist' filepath='../../include/libzfs.h' line='488' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='lzc_change_key' mangled-name='lzc_change_key' filepath='../../include/libzfs_core.h' line='64' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zfs_prop_to_name' mangled-name='zfs_prop_to_name' filepath='../../include/libzfs.h' line='491' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='nvlist_lookup_string' mangled-name='nvlist_lookup_string' filepath='../../include/sys/nvpair.h' line='213' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='nvlist_add_uint64' mangled-name='nvlist_add_uint64' filepath='../../include/sys/nvpair.h' line='178' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='lzc_unload_key' mangled-name='lzc_unload_key' filepath='../../include/libzfs_core.h' line='63' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zpool_get_prop_int' mangled-name='zpool_get_prop_int' filepath='../../include/libzfs.h' line='329' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='PKCS5_PBKDF2_HMAC_SHA1' mangled-name='PKCS5_PBKDF2_HMAC_SHA1' filepath='/usr/include/openssl/evp.h' line='1087' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <enum-decl name='__anonymous_enum__' is-anonymous='yes' filepath='../../include/sys/fs/zfs.h' line='1439' column='1' id='type-id-119'>
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	- <function-decl name='zfs_wait_status' mangled-name='zfs_wait_status' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5546' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_wait_status'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5546' column='1'/>
	- <parameter type-id='type-id-120' name='activity' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5546' column='1'/>
	- <parameter type-id='type-id-114' name='missing' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5547' column='1'/>
	- <parameter type-id='type-id-114' name='waited' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5547' column='1'/>
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	- <function-decl name='zvol_volsize_to_reservation' mangled-name='zvol_volsize_to_reservation' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5490' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zvol_volsize_to_reservation'>
	- <parameter type-id='type-id-18' name='zph' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5490' column='1'/>
	- <parameter type-id='type-id-27' name='volsize' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5490' column='1'/>
	- <parameter type-id='type-id-22' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5491' column='1'/>
	- <return type-id='type-id-27'/>
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	- <function-decl name='zfs_get_holds' mangled-name='zfs_get_holds' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5232' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_holds'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5232' column='1'/>
	- <parameter type-id='type-id-115' name='nvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5232' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_set_fsacl' mangled-name='zfs_set_fsacl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5178' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_set_fsacl'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5178' column='1'/>
	- <parameter type-id='type-id-5' name='un' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5178' column='1'/>
	- <parameter type-id='type-id-22' name='nvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5178' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_get_fsacl' mangled-name='zfs_get_fsacl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5111' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_fsacl'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5111' column='1'/>
	- <parameter type-id='type-id-115' name='nvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5111' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_release' mangled-name='zfs_release' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5030' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_release'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5030' column='1'/>
	- <parameter type-id='type-id-104' name='snapname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5030' column='1'/>
	- <parameter type-id='type-id-104' name='tag' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5030' column='1'/>
	- <parameter type-id='type-id-5' name='recursive' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='5031' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_hold_nvl' mangled-name='zfs_hold_nvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4931' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_hold_nvl'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4931' column='1'/>
	- <parameter type-id='type-id-6' name='cleanup_fd' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4931' column='1'/>
	- <parameter type-id='type-id-22' name='holds' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4931' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_hold' mangled-name='zfs_hold' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4899' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_hold'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4899' column='1'/>
	- <parameter type-id='type-id-104' name='snapname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4899' column='1'/>
	- <parameter type-id='type-id-104' name='tag' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4899' column='1'/>
	- <parameter type-id='type-id-5' name='recursive' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4900' column='1'/>
	- <parameter type-id='type-id-6' name='cleanup_fd' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4900' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
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	- <underlying-type type-id='type-id-7'/>
	+ <abi-instr version='1.0' address-size='64' path='libzfs_dataset.c' language='LANG_C89'>
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	+ <var-decl name='mnt_mountp' type-id='26a90f95' visibility='default'/>
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	+ <var-decl name='mnt_fstype' type-id='26a90f95' visibility='default'/>
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	+ <var-decl name='mnt_mntopts' type-id='26a90f95' visibility='default'/>
	+ </data-member>
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	+ <var-decl name='recursive' type-id='95e97e5e' visibility='default'/>
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	+ <var-decl name='nounmount' type-id='95e97e5e' visibility='default'/>
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	+ <var-decl name='forceunmount' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
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	+ <typedef-decl name='zprop_list_t' type-id='bd9b4291' id='bdb8ac4f'/>
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	+ <var-decl name='pl_all' type-id='c19b74c3' visibility='default'/>
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	+ <var-decl name='pl_recvd_width' type-id='b59d7dce' visibility='default'/>
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	+ <var-decl name='pl_fixed' type-id='c19b74c3' visibility='default'/>
	+ </data-member>
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	+ <typedef-decl name='zfs_userquota_prop_t' type-id='08f5ca1c' id='279fde6a'/>
	+ <enum-decl name='__anonymous_enum__' is-anonymous='yes' id='08f5ca1c'>
	+ <underlying-type type-id='9cac1fee'/>
	<enumerator name='ZFS_PROP_USERUSED' value='0'/>
	<enumerator name='ZFS_PROP_USERQUOTA' value='1'/>
	<enumerator name='ZFS_PROP_GROUPUSED' value='2'/>
	<enumerator name='ZFS_PROP_GROUPQUOTA' value='3'/>
	<enumerator name='ZFS_PROP_USEROBJUSED' value='4'/>
	<enumerator name='ZFS_PROP_USEROBJQUOTA' value='5'/>
	<enumerator name='ZFS_PROP_GROUPOBJUSED' value='6'/>
	<enumerator name='ZFS_PROP_GROUPOBJQUOTA' value='7'/>
	<enumerator name='ZFS_PROP_PROJECTUSED' value='8'/>
	<enumerator name='ZFS_PROP_PROJECTQUOTA' value='9'/>
	<enumerator name='ZFS_PROP_PROJECTOBJUSED' value='10'/>
	<enumerator name='ZFS_PROP_PROJECTOBJQUOTA' value='11'/>
	<enumerator name='ZFS_NUM_USERQUOTA_PROPS' value='12'/>
	</enum-decl>
	- <typedef-decl name='zfs_userquota_prop_t' type-id='type-id-121' filepath='../../include/sys/fs/zfs.h' line='206' column='1' id='type-id-122'/>
	- <typedef-decl name='__uid_t' type-id='type-id-64' filepath='/usr/include/x86_64-linux-gnu/bits/types.h' line='144' column='1' id='type-id-123'/>
	- <typedef-decl name='uid_t' type-id='type-id-123' filepath='/usr/include/x86_64-linux-gnu/sys/types.h' line='79' column='1' id='type-id-124'/>
	- <pointer-type-def type-id='type-id-125' size-in-bits='64' id='type-id-126'/>
	- <typedef-decl name='zfs_userspace_cb_t' type-id='type-id-126' filepath='../../include/libzfs.h' line='738' column='1' id='type-id-127'/>
	- <function-decl name='zfs_userspace' mangled-name='zfs_userspace' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4819' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_userspace'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4819' column='1'/>
	- <parameter type-id='type-id-122' name='type' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4819' column='1'/>
	- <parameter type-id='type-id-127' name='func' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4820' column='1'/>
	- <parameter type-id='type-id-42' name='arg' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4820' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_smb_acl_rename' mangled-name='zfs_smb_acl_rename' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4811' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_smb_acl_rename'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4811' column='1'/>
	- <parameter type-id='type-id-23' name='dataset' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4811' column='1'/>
	- <parameter type-id='type-id-23' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4811' column='1'/>
	- <parameter type-id='type-id-23' name='oldname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4812' column='1'/>
	- <parameter type-id='type-id-23' name='newname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4812' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_smb_acl_purge' mangled-name='zfs_smb_acl_purge' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4804' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_smb_acl_purge'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4804' column='1'/>
	- <parameter type-id='type-id-23' name='dataset' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4804' column='1'/>
	- <parameter type-id='type-id-23' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4804' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_smb_acl_remove' mangled-name='zfs_smb_acl_remove' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4796' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_smb_acl_remove'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4796' column='1'/>
	- <parameter type-id='type-id-23' name='dataset' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4796' column='1'/>
	- <parameter type-id='type-id-23' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4797' column='1'/>
	- <parameter type-id='type-id-23' name='resource' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4797' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_smb_acl_add' mangled-name='zfs_smb_acl_add' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4788' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_smb_acl_add'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4796' column='1'/>
	- <parameter type-id='type-id-23' name='dataset' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4796' column='1'/>
	- <parameter type-id='type-id-23' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4797' column='1'/>
	- <parameter type-id='type-id-23' name='resource' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4797' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_prune_proplist' mangled-name='zfs_prune_proplist' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4706' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prune_proplist'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4706' column='1'/>
	- <parameter type-id='type-id-24' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4706' column='1'/>
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	- <class-decl name='zprop_list' size-in-bits='448' is-struct='yes' visibility='default' filepath='../../include/libzfs.h' line='536' column='1' id='type-id-128'>
	+ <typedef-decl name='zfs_userspace_cb_t' type-id='ca64ff60' id='16c5f410'/>
	+ <typedef-decl name='uid_t' type-id='cc5fcceb' id='354978ed'/>
	+ <typedef-decl name='zfs_wait_activity_t' type-id='40ed39d5' id='3024501a'/>
	+ <enum-decl name='__anonymous_enum__1' is-anonymous='yes' id='40ed39d5'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='ZFS_WAIT_DELETEQ' value='0'/>
	+ <enumerator name='ZFS_WAIT_NUM_ACTIVITIES' value='1'/>
	+ </enum-decl>
	+ <typedef-decl name='int64_t' type-id='bd54fe1a' id='9da381c4'/>
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	- <var-decl name='pl_prop' type-id='type-id-6' visibility='default' filepath='../../include/libzfs.h' line='537' column='1'/>
	+ <var-decl name='pw_name' type-id='26a90f95' visibility='default'/>
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	+ <var-decl name='pw_passwd' type-id='26a90f95' visibility='default'/>
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	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4609' column='1'/>
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	- <function-decl name='zfs_get_user_props' mangled-name='zfs_get_user_props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4590' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_user_props'>
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	- <function-decl name='zfs_get_recvd_props' mangled-name='zfs_get_recvd_props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4581' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_recvd_props'>
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	- <function-decl name='zfs_get_all_props' mangled-name='zfs_get_all_props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4575' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_all_props'>
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	- <typedef-decl name='renameflags_t' type-id='type-id-133' filepath='../../include/libzfs.h' line='659' column='1' id='type-id-134'/>
	- <function-decl name='zfs_rename' mangled-name='zfs_rename' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4373' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_rename'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4373' column='1'/>
	- <parameter type-id='type-id-104' name='target' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4373' column='1'/>
	- <parameter type-id='type-id-134' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4373' column='1'/>
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	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4273' column='1'/>
	- <parameter type-id='type-id-102' name='snap' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4273' column='1'/>
	- <parameter type-id='type-id-5' name='force' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4273' column='1'/>
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	- <function-decl name='zfs_snapshot' mangled-name='zfs_snapshot' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4172' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_snapshot'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4172' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4172' column='1'/>
	- <parameter type-id='type-id-5' name='recursive' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4172' column='1'/>
	- <parameter type-id='type-id-22' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4173' column='1'/>
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	- <function-decl name='zfs_snapshot_nvl' mangled-name='zfs_snapshot_nvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4092' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_snapshot_nvl'>
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	- <parameter type-id='type-id-22' name='snaps' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4092' column='1'/>
	- <parameter type-id='type-id-22' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4092' column='1'/>
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	- <function-decl name='zfs_promote' mangled-name='zfs_promote' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4008' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_promote'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='4008' column='1'/>
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	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3922' column='1'/>
	- <parameter type-id='type-id-104' name='target' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3922' column='1'/>
	- <parameter type-id='type-id-22' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3922' column='1'/>
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	- <parameter type-id='type-id-22' name='snaps' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3875' column='1'/>
	- <parameter type-id='type-id-5' name='defer' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3875' column='1'/>
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	- <function-decl name='zfs_destroy_snaps' mangled-name='zfs_destroy_snaps' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3851' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_destroy_snaps'>
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	- <parameter type-id='type-id-5' name='defer' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3851' column='1'/>
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	- <function-decl name='zfs_destroy' mangled-name='zfs_destroy' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3783' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_destroy'>
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	- <parameter type-id='type-id-5' name='defer' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3783' column='1'/>
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	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3571' column='1'/>
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	- <function-decl name='create_parents' mangled-name='create_parents' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3497' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='create_parents'>
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	- <parameter type-id='type-id-43' name='buflen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3376' column='1'/>
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	- <function-decl name='zfs_get_type' mangled-name='zfs_get_type' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3330' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_type'>
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	- <function-decl name='zfs_get_pool_name' mangled-name='zfs_get_pool_name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3321' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_pool_name'>
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	- <function-decl name='zfs_get_name' mangled-name='zfs_get_name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3312' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_name'>
	- <parameter type-id='type-id-136' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3321' column='1'/>
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	- <function-decl name='zfs_prop_get_written' mangled-name='zfs_prop_get_written' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3287' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_written'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3287' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3287' column='1'/>
	- <parameter type-id='type-id-23' name='propbuf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3288' column='1'/>
	- <parameter type-id='type-id-6' name='proplen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3288' column='1'/>
	- <parameter type-id='type-id-5' name='literal' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3288' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <pointer-type-def type-id='type-id-27' size-in-bits='64' id='type-id-137'/>
	- <function-decl name='zfs_prop_get_written_int' mangled-name='zfs_prop_get_written_int' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3252' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_written_int'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3252' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3252' column='1'/>
	- <parameter type-id='type-id-137' name='propvalue' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3253' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_prop_get_userquota' mangled-name='zfs_prop_get_userquota' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3216' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_userquota'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3216' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3216' column='1'/>
	- <parameter type-id='type-id-23' name='propbuf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3217' column='1'/>
	- <parameter type-id='type-id-6' name='proplen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3217' column='1'/>
	- <parameter type-id='type-id-5' name='literal' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3217' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_prop_get_userquota_int' mangled-name='zfs_prop_get_userquota_int' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3206' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_userquota_int'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3206' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3206' column='1'/>
	- <parameter type-id='type-id-137' name='propvalue' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3207' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <enum-decl name='__anonymous_enum__' is-anonymous='yes' filepath='../../include/sys/fs/zfs.h' line='259' column='1' id='type-id-138'>
	- <underlying-type type-id='type-id-7'/>
	- <enumerator name='ZPROP_SRC_NONE' value='1'/>
	- <enumerator name='ZPROP_SRC_DEFAULT' value='2'/>
	- <enumerator name='ZPROP_SRC_TEMPORARY' value='4'/>
	- <enumerator name='ZPROP_SRC_LOCAL' value='8'/>
	- <enumerator name='ZPROP_SRC_INHERITED' value='16'/>
	- <enumerator name='ZPROP_SRC_RECEIVED' value='32'/>
	+ <class-decl name='tm' size-in-bits='448' is-struct='yes' visibility='default' id='dddf6ca2'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='tm_sec' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='32'>
	+ <var-decl name='tm_min' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='tm_hour' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='96'>
	+ <var-decl name='tm_mday' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='tm_mon' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='160'>
	+ <var-decl name='tm_year' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='tm_wday' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='224'>
	+ <var-decl name='tm_yday' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='256'>
	+ <var-decl name='tm_isdst' type-id='95e97e5e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='320'>
	+ <var-decl name='tm_gmtoff' type-id='bd54fe1a' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='384'>
	+ <var-decl name='tm_zone' type-id='80f4b756' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='time_t' type-id='65eda9c0' id='c9d12d66'/>
	+ <typedef-decl name='__time_t' type-id='bd54fe1a' id='65eda9c0'/>
	+ <enum-decl name='lzc_dataset_type' id='bc9887f1'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='LZC_DATSET_TYPE_ZFS' value='2'/>
	+ <enumerator name='LZC_DATSET_TYPE_ZVOL' value='3'/>
	</enum-decl>
	- <typedef-decl name='zprop_source_t' type-id='type-id-138' filepath='../../include/sys/fs/zfs.h' line='266' column='1' id='type-id-139'/>
	- <pointer-type-def type-id='type-id-139' size-in-bits='64' id='type-id-140'/>
	- <function-decl name='zfs_prop_get_numeric' mangled-name='zfs_prop_get_numeric' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3002' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_numeric'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3002' column='1'/>
	- <parameter type-id='type-id-2' name='prop' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3002' column='1'/>
	- <parameter type-id='type-id-137' name='value' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3002' column='1'/>
	- <parameter type-id='type-id-140' name='src' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3003' column='1'/>
	- <parameter type-id='type-id-23' name='statbuf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3003' column='1'/>
	- <parameter type-id='type-id-43' name='statlen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='3003' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_prop_get_int' mangled-name='zfs_prop_get_int' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2979' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_int'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2979' column='1'/>
	- <parameter type-id='type-id-2' name='prop' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2979' column='1'/>
	- <return type-id='type-id-27'/>
	- </function-decl>
	- <function-decl name='zfs_prop_get' mangled-name='zfs_prop_get' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2604' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2604' column='1'/>
	- <parameter type-id='type-id-2' name='prop' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2604' column='1'/>
	- <parameter type-id='type-id-23' name='propbuf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2604' column='1'/>
	- <parameter type-id='type-id-43' name='proplen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2604' column='1'/>
	- <parameter type-id='type-id-140' name='src' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2605' column='1'/>
	- <parameter type-id='type-id-23' name='statbuf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2605' column='1'/>
	- <parameter type-id='type-id-43' name='statlen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2605' column='1'/>
	- <parameter type-id='type-id-5' name='literal' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2605' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_get_clones_nvl' mangled-name='zfs_get_clones_nvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2435' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_clones_nvl'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2435' column='1'/>
	- <return type-id='type-id-22'/>
	- </function-decl>
	- <function-decl name='zfs_prop_get_recvd' mangled-name='zfs_prop_get_recvd' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2348' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_recvd'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2348' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2348' column='1'/>
	- <parameter type-id='type-id-23' name='propbuf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2348' column='1'/>
	- <parameter type-id='type-id-43' name='proplen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2349' column='1'/>
	- <parameter type-id='type-id-5' name='literal' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='2349' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_prop_inherit' mangled-name='zfs_prop_inherit' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1926' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_inherit'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1926' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1926' column='1'/>
	- <parameter type-id='type-id-5' name='received' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1926' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_prop_set_list' mangled-name='zfs_prop_set_list' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1744' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_set_list'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1744' column='1'/>
	- <parameter type-id='type-id-22' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1744' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_prop_set' mangled-name='zfs_prop_set' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1713' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_set'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1713' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1713' column='1'/>
	- <parameter type-id='type-id-104' name='propval' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1713' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_valid_proplist' mangled-name='zfs_valid_proplist' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1004' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_valid_proplist'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1004' column='1'/>
	- <parameter type-id='type-id-20' name='type' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1004' column='1'/>
	- <parameter type-id='type-id-22' name='nvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1004' column='1'/>
	- <parameter type-id='type-id-27' name='zoned' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1005' column='1'/>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1005' column='1'/>
	- <parameter type-id='type-id-18' name='zpool_hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1005' column='1'/>
	- <parameter type-id='type-id-5' name='key_params_ok' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1006' column='1'/>
	- <parameter type-id='type-id-104' name='errbuf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='1006' column='1'/>
	- <return type-id='type-id-22'/>
	- </function-decl>
	- <pointer-type-def type-id='type-id-6' size-in-bits='64' id='type-id-141'/>
	- <function-decl name='zfs_spa_version' mangled-name='zfs_spa_version' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='967' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_spa_version'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='967' column='1'/>
	- <parameter type-id='type-id-141' name='spa_version' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='967' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='libzfs_mnttab_remove' mangled-name='libzfs_mnttab_remove' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='947' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_remove'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='947' column='1'/>
	- <parameter type-id='type-id-104' name='fsname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='947' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='libzfs_mnttab_add' mangled-name='libzfs_mnttab_add' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='917' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_add'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='917' column='1'/>
	- <parameter type-id='type-id-104' name='special' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='917' column='1'/>
	- <parameter type-id='type-id-104' name='mountp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='918' column='1'/>
	- <parameter type-id='type-id-104' name='mntopts' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='918' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='libzfs_mnttab_cache' mangled-name='libzfs_mnttab_cache' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='865' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_cache'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='865' column='1'/>
	- <parameter type-id='type-id-5' name='enable' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='865' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='libzfs_mnttab_fini' mangled-name='libzfs_mnttab_fini' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='847' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_fini'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='847' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='libzfs_mnttab_init' mangled-name='libzfs_mnttab_init' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='800' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_init'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='800' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zfs_close' mangled-name='zfs_close' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='772' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_close'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='772' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zfs_open' mangled-name='zfs_open' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='683' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_open'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='683' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='683' column='1'/>
	- <parameter type-id='type-id-6' name='types' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='683' column='1'/>
	- <return type-id='type-id-102'/>
	- </function-decl>
	- <function-decl name='make_bookmark_handle' mangled-name='make_bookmark_handle' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='618' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='make_bookmark_handle'>
	- <parameter type-id='type-id-102' name='parent' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='618' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='618' column='1'/>
	- <parameter type-id='type-id-22' name='bmark_props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='619' column='1'/>
	- <return type-id='type-id-102'/>
	- </function-decl>
	- <function-decl name='zfs_bookmark_exists' mangled-name='zfs_bookmark_exists' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='587' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_bookmark_exists'>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='587' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='zfs_handle_dup' mangled-name='zfs_handle_dup' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='540' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_handle_dup'>
	- <parameter type-id='type-id-102' name='zhp_orig' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='540' column='1'/>
	- <return type-id='type-id-102'/>
	- </function-decl>
	- <class-decl name='zfs_cmd' size-in-bits='109952' is-struct='yes' visibility='default' filepath='../../include/sys/zfs_ioctl.h' line='477' column='1' id='type-id-142'>
	+ <pointer-type-def type-id='fba6cb51' size-in-bits='64' id='32adbf30'/>
	+ <pointer-type-def type-id='f20fbd51' size-in-bits='64' id='a3681dea'/>
	+ <pointer-type-def type-id='80f4b756' size-in-bits='64' id='7d3cd834'/>
	+ <qualified-type-def type-id='56fe4a37' const='yes' id='a75125ce'/>
	+ <pointer-type-def type-id='a75125ce' size-in-bits='64' id='48bea5ec'/>
	+ <qualified-type-def type-id='8afd6070' const='yes' id='1d853360'/>
	+ <pointer-type-def type-id='1d853360' size-in-bits='64' id='c2afbd7e'/>
	+ <qualified-type-def type-id='c9d12d66' const='yes' id='588b3216'/>
	+ <pointer-type-def type-id='588b3216' size-in-bits='64' id='9f201474'/>
	+ <qualified-type-def type-id='dddf6ca2' const='yes' id='e824a34f'/>
	+ <pointer-type-def type-id='e824a34f' size-in-bits='64' id='d6ad37ff'/>
	+ <pointer-type-def type-id='01a1b934' size-in-bits='64' id='566b3f52'/>
	+ <pointer-type-def type-id='7e291ce6' size-in-bits='64' id='ca64ff60'/>
	+ <pointer-type-def type-id='9da381c4' size-in-bits='64' id='cb785ebf'/>
	+ <pointer-type-def type-id='1b055409' size-in-bits='64' id='9d424d31'/>
	+ <pointer-type-def type-id='8e0af06e' size-in-bits='64' id='053457bd'/>
	+ <pointer-type-def type-id='857bb57e' size-in-bits='64' id='75be733c'/>
	+ <pointer-type-def type-id='a63d15a3' size-in-bits='64' id='a195f4a3'/>
	+ <pointer-type-def type-id='7a6844eb' size-in-bits='64' id='18c91f9e'/>
	+ <pointer-type-def type-id='dddf6ca2' size-in-bits='64' id='d915a820'/>
	+ <pointer-type-def type-id='5d6479ae' size-in-bits='64' id='892b4acc'/>
	+ <pointer-type-def type-id='bd9b4291' size-in-bits='64' id='9f1a1109'/>
	+ <pointer-type-def type-id='bdb8ac4f' size-in-bits='64' id='3a9b2288'/>
	+ <pointer-type-def type-id='3a9b2288' size-in-bits='64' id='e4378506'/>
	+ <function-decl name='zfs_type_to_name' mangled-name='zfs_type_to_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_type_to_name'>
	+ <parameter type-id='2e45de5d' name='type'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zfs_validate_name' mangled-name='zfs_validate_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_validate_name'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='95e97e5e' name='type'/>
	+ <parameter type-id='c19b74c3' name='modifying'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_name_valid' mangled-name='zfs_name_valid' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_name_valid'>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='2e45de5d' name='type'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_free_handles' mangled-name='zpool_free_handles' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_free_handles'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='make_dataset_handle_zc' mangled-name='make_dataset_handle_zc' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='make_dataset_handle_zc'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='e4ec4540' name='zc'/>
	+ <return type-id='9200a744'/>
	+ </function-decl>
	+ <function-decl name='make_dataset_simple_handle_zc' mangled-name='make_dataset_simple_handle_zc' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='make_dataset_simple_handle_zc'>
	+ <parameter type-id='9200a744' name='pzhp'/>
	+ <parameter type-id='e4ec4540' name='zc'/>
	+ <return type-id='9200a744'/>
	+ </function-decl>
	+ <function-decl name='zfs_bookmark_exists' mangled-name='zfs_bookmark_exists' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_bookmark_exists'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='make_bookmark_handle' mangled-name='make_bookmark_handle' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='make_bookmark_handle'>
	+ <parameter type-id='9200a744' name='parent'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='5ce45b60' name='bmark_props'/>
	+ <return type-id='9200a744'/>
	+ </function-decl>
	+ <function-decl name='libzfs_mnttab_init' mangled-name='libzfs_mnttab_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_init'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='libzfs_mnttab_fini' mangled-name='libzfs_mnttab_fini' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_fini'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='libzfs_mnttab_cache' mangled-name='libzfs_mnttab_cache' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_cache'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='c19b74c3' name='enable'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='libzfs_mnttab_find' mangled-name='libzfs_mnttab_find' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_find'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <parameter type-id='9d424d31' name='entry'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libzfs_mnttab_add' mangled-name='libzfs_mnttab_add' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_add'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='special'/>
	+ <parameter type-id='80f4b756' name='mountp'/>
	+ <parameter type-id='80f4b756' name='mntopts'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='libzfs_mnttab_remove' mangled-name='libzfs_mnttab_remove' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_mnttab_remove'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_spa_version' mangled-name='zfs_spa_version' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_spa_version'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='7292109c' name='spa_version'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='getprop_uint64' mangled-name='getprop_uint64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='getprop_uint64'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <parameter type-id='9b23c9ad' name='source'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_inherit' mangled-name='zfs_prop_inherit' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_inherit'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='c19b74c3' name='received'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_numeric' mangled-name='zfs_prop_get_numeric' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_numeric'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='58603c44' name='prop'/>
	+ <parameter type-id='5d6479ae' name='value'/>
	+ <parameter type-id='debc6aa3' name='src'/>
	+ <parameter type-id='26a90f95' name='statbuf'/>
	+ <parameter type-id='b59d7dce' name='statlen'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_userquota_int' mangled-name='zfs_prop_get_userquota_int' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_userquota_int'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='5d6479ae' name='propvalue'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_userquota' mangled-name='zfs_prop_get_userquota' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_userquota'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='26a90f95' name='propbuf'/>
	+ <parameter type-id='95e97e5e' name='proplen'/>
	+ <parameter type-id='c19b74c3' name='literal'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_written_int' mangled-name='zfs_prop_get_written_int' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_written_int'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='5d6479ae' name='propvalue'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_written' mangled-name='zfs_prop_get_written' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_written'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='26a90f95' name='propbuf'/>
	+ <parameter type-id='95e97e5e' name='proplen'/>
	+ <parameter type-id='c19b74c3' name='literal'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_clones_nvl' mangled-name='zfs_get_clones_nvl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_clones_nvl'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_recvd' mangled-name='zfs_prop_get_recvd' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_recvd'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='26a90f95' name='propbuf'/>
	+ <parameter type-id='b59d7dce' name='proplen'/>
	+ <parameter type-id='c19b74c3' name='literal'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_pool_name' mangled-name='zfs_get_pool_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_pool_name'>
	+ <parameter type-id='fcd57163' name='zhp'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_type' mangled-name='zfs_get_type' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_type'>
	+ <parameter type-id='fcd57163' name='zhp'/>
	+ <return type-id='2e45de5d'/>
	+ </function-decl>
	+ <function-decl name='zfs_dataset_exists' mangled-name='zfs_dataset_exists' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_dataset_exists'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='2e45de5d' name='types'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_create' mangled-name='zfs_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_create'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='2e45de5d' name='type'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='create_parents' mangled-name='create_parents' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='create_parents'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='26a90f95' name='target'/>
	+ <parameter type-id='95e97e5e' name='prefixlen'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_create_ancestors' mangled-name='zfs_create_ancestors' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_create_ancestors'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_destroy' mangled-name='zfs_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_destroy'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='c19b74c3' name='defer'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_destroy_snaps_nvl' mangled-name='zfs_destroy_snaps_nvl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_destroy_snaps_nvl'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='5ce45b60' name='snaps'/>
	+ <parameter type-id='c19b74c3' name='defer'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_destroy_snaps' mangled-name='zfs_destroy_snaps' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_destroy_snaps'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='26a90f95' name='snapname'/>
	+ <parameter type-id='c19b74c3' name='defer'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_promote' mangled-name='zfs_promote' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_promote'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_snapshot_nvl' mangled-name='zfs_snapshot_nvl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_snapshot_nvl'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='5ce45b60' name='snaps'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_snapshot' mangled-name='zfs_snapshot' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_snapshot'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='c19b74c3' name='recursive'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_rename' mangled-name='zfs_rename' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_rename'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='target'/>
	+ <parameter type-id='067170c2' name='flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_all_props' mangled-name='zfs_get_all_props' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_all_props'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_recvd_props' mangled-name='zfs_get_recvd_props' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_recvd_props'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_user_props' mangled-name='zfs_get_user_props' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_user_props'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zfs_expand_proplist' mangled-name='zfs_expand_proplist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_expand_proplist'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='e4378506' name='plp'/>
	+ <parameter type-id='c19b74c3' name='received'/>
	+ <parameter type-id='c19b74c3' name='literal'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prune_proplist' mangled-name='zfs_prune_proplist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prune_proplist'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='ae3e8ca6' name='props'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_smb_acl_add' mangled-name='zfs_smb_acl_add' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_smb_acl_add'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='26a90f95' name='dataset'/>
	+ <parameter type-id='26a90f95' name='path'/>
	+ <parameter type-id='26a90f95' name='resource'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_smb_acl_remove' mangled-name='zfs_smb_acl_remove' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_smb_acl_remove'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='26a90f95' name='dataset'/>
	+ <parameter type-id='26a90f95' name='path'/>
	+ <parameter type-id='26a90f95' name='resource'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_smb_acl_purge' mangled-name='zfs_smb_acl_purge' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_smb_acl_purge'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='26a90f95' name='dataset'/>
	+ <parameter type-id='26a90f95' name='path'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_smb_acl_rename' mangled-name='zfs_smb_acl_rename' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_smb_acl_rename'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='26a90f95' name='dataset'/>
	+ <parameter type-id='26a90f95' name='path'/>
	+ <parameter type-id='26a90f95' name='oldname'/>
	+ <parameter type-id='26a90f95' name='newname'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_userspace' mangled-name='zfs_userspace' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_userspace'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='279fde6a' name='type'/>
	+ <parameter type-id='16c5f410' name='func'/>
	+ <parameter type-id='eaa32e2f' name='arg'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_hold_nvl' mangled-name='zfs_hold_nvl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_hold_nvl'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='95e97e5e' name='cleanup_fd'/>
	+ <parameter type-id='5ce45b60' name='holds'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_hold' mangled-name='zfs_hold' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_hold'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='80f4b756' name='tag'/>
	+ <parameter type-id='c19b74c3' name='recursive'/>
	+ <parameter type-id='95e97e5e' name='cleanup_fd'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_release' mangled-name='zfs_release' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_release'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='80f4b756' name='tag'/>
	+ <parameter type-id='c19b74c3' name='recursive'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_fsacl' mangled-name='zfs_get_fsacl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_fsacl'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='857bb57e' name='nvl'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_set_fsacl' mangled-name='zfs_set_fsacl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_set_fsacl'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='c19b74c3' name='un'/>
	+ <parameter type-id='5ce45b60' name='nvl'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_get_holds' mangled-name='zfs_get_holds' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_holds'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='857bb57e' name='nvl'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zvol_volsize_to_reservation' mangled-name='zvol_volsize_to_reservation' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zvol_volsize_to_reservation'>
	+ <parameter type-id='4c81de99' name='zph'/>
	+ <parameter type-id='9c313c2d' name='volsize'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_set_list' mangled-name='zfs_prop_set_list' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_set_list'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_set' mangled-name='zfs_prop_set' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_set'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='80f4b756' name='propval'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_rollback' mangled-name='zfs_rollback' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_rollback'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='9200a744' name='snap'/>
	+ <parameter type-id='c19b74c3' name='force'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_clone' mangled-name='zfs_clone' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_clone'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='target'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_wait_status' mangled-name='zfs_wait_status' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_wait_status'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='3024501a' name='activity'/>
	+ <parameter type-id='37e3bd22' name='missing'/>
	+ <parameter type-id='37e3bd22' name='waited'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_int64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='cb785ebf'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='lzc_channel_program_nosync' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_type' mangled-name='zfs_prop_get_type' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_type'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='31429eff'/>
	+ </function-decl>
	+ <function-decl name='strrchr' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='ioctl' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='7359adad'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_alloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='857bb57e'/>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zcmd_write_src_nvlist' mangled-name='zcmd_write_src_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zcmd_write_src_nvlist'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='e4ec4540'/>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_user' mangled-name='zfs_prop_user' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_user'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_name' mangled-name='zpool_get_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_name'>
	+ <parameter type-id='4c81de99'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zpool_open_canfail' mangled-name='zpool_open_canfail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_open_canfail'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='4c81de99'/>
	+ </function-decl>
	+ <function-decl name='abort' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='strtoul' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='7359adad'/>
	+ </function-decl>
	+ <function-decl name='getpwnam' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='a195f4a3'/>
	+ </function-decl>
	+ <function-decl name='getgrnam' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='566b3f52'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_default_string' mangled-name='zfs_prop_default_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_default_string'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='strstr' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='entity_namecheck' mangled-name='entity_namecheck' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='entity_namecheck'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='053457bd'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_name_valid' mangled-name='zpool_name_valid' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_name_valid'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='c19b74c3'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zpool_close' mangled-name='zpool_close' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_close'>
	+ <parameter type-id='4c81de99'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='lzc_get_bookmarks' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_iter_bookmarks' mangled-name='zfs_iter_bookmarks' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_iter_bookmarks'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='d8e49ab9'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_exists' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_boolean' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_boolean' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_free' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='lzc_get_holds' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='pthread_mutex_init' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='18c91f9e'/>
	+ <parameter type-id='c2afbd7e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='avl_create' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='585e1de9'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='avl_destroy_nodes' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='63e171df'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='avl_destroy' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a3681dea'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='pthread_mutex_destroy' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='18c91f9e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='avl_numnodes' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a3681dea'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='getmntany' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='9d424d31'/>
	+ <parameter type-id='9d424d31'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='avl_find' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='32adbf30'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='avl_add' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='_sol_getmntent' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='9d424d31'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='pthread_mutex_unlock' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='18c91f9e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='pthread_mutex_lock' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='18c91f9e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='avl_remove' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_default_numeric' mangled-name='zfs_prop_default_numeric' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_default_numeric'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='hasmntopt' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='48bea5ec'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_valid_for_type' mangled-name='zfs_prop_valid_for_type' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_valid_for_type'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='2e45de5d'/>
	+ <parameter type-id='c19b74c3'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_readonly' mangled-name='zfs_prop_readonly' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_readonly'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_setonce' mangled-name='zfs_prop_setonce' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_setonce'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='mountpoint_namecheck' mangled-name='mountpoint_namecheck' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='mountpoint_namecheck'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='053457bd'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_get_feature' mangled-name='zpool_prop_get_feature' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_get_feature'>
	+ <parameter type-id='4c81de99'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_nicebytes' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_parse_options' mangled-name='zfs_parse_options' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_parse_options'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='a7913f77'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_type' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3fa542f0'/>
	+ <return type-id='8d0687d2'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_uint64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='5d6479ae'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='asprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9b23c9ad'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint64_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5d6479ae'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_nicestrtonum' mangled-name='zfs_nicestrtonum' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_nicestrtonum'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5d6479ae'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_encryption_key_param' mangled-name='zfs_prop_encryption_key_param' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_encryption_key_param'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zprop_parse_value' mangled-name='zprop_parse_value' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_parse_value'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='2e45de5d'/>
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	+ <parameter type-id='5d6479ae'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_userquota' mangled-name='zfs_prop_userquota' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_userquota'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_written' mangled-name='zfs_prop_written' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_written'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_valid_keylocation' mangled-name='zfs_prop_valid_keylocation' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_valid_keylocation'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='c19b74c3'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_inheritable' mangled-name='zfs_prop_inheritable' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_inheritable'>
	+ <parameter type-id='58603c44'/>
	+ <return type-id='c19b74c3'/>
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	+ <function-decl name='zfs_error_fmt' mangled-name='zfs_error_fmt' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_error_fmt'>
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	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
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	+ <function-decl name='zfs_nicenum' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
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	+ <function-decl name='nvlist_lookup_uint64_array' visibility='default' binding='global' size-in-bits='64'>
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	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='892b4acc'/>
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	+ <parameter type-id='d915a820'/>
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	+ <parameter type-id='80f4b756'/>
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	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='908' column='1'/>
	- <parameter type-id='type-id-104' name='mountpoint' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='908' column='1'/>
	- <parameter type-id='type-id-107' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='909' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_share_smb' mangled-name='zfs_share_smb' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='893' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_share_smb'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='989' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_share_nfs' mangled-name='zfs_share_nfs' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='887' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_share_nfs'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='989' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_commit_shares' mangled-name='zfs_commit_shares' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='876' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_commit_shares'>
	- <parameter type-id='type-id-104' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='876' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zfs_commit_proto' mangled-name='zfs_commit_proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='849' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_commit_proto'>
	- <parameter type-id='type-id-107' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='849' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zfs_parse_options' mangled-name='zfs_parse_options' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='843' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_parse_options'>
	- <parameter type-id='type-id-23' name='options' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='843' column='1'/>
	- <parameter type-id='type-id-106' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='843' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_is_shared_smb' mangled-name='zfs_is_shared_smb' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='830' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_shared_smb'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='830' column='1'/>
	- <parameter type-id='type-id-161' name='where' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='830' column='1'/>
	- <return type-id='type-id-5'/>
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	- <function-decl name='zfs_is_shared_nfs' mangled-name='zfs_is_shared_nfs' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='823' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_shared_nfs'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='830' column='1'/>
	- <parameter type-id='type-id-161' name='where' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='830' column='1'/>
	- <return type-id='type-id-5'/>
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	- <enum-decl name='__anonymous_enum__' is-anonymous='yes' filepath='../../include/libzfs_impl.h' line='120' column='1' id='type-id-183'>
	- <underlying-type type-id='type-id-7'/>
	- <enumerator name='SHARED_NOT_SHARED' value='0'/>
	- <enumerator name='SHARED_NFS' value='2'/>
	- <enumerator name='SHARED_SMB' value='4'/>
	- </enum-decl>
	- <typedef-decl name='zfs_share_type_t' type-id='type-id-183' filepath='../../include/libzfs_impl.h' line='124' column='1' id='type-id-184'/>
	- <function-decl name='zfs_is_shared_proto' mangled-name='zfs_is_shared_proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='801' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_shared_proto'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='801' column='1'/>
	- <parameter type-id='type-id-161' name='where' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='801' column='1'/>
	- <parameter type-id='type-id-106' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='801' column='1'/>
	- <return type-id='type-id-184'/>
	- </function-decl>
	- <function-decl name='zfs_unshare' mangled-name='zfs_unshare' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='791' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshare'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='989' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_share' mangled-name='zfs_share' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='784' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_share'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='989' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_share_proto' mangled-name='zfs_share_proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='739' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_share_proto'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='739' column='1'/>
	- <parameter type-id='type-id-107' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='739' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='unshare_one' mangled-name='unshare_one' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='699' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='unshare_one'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='699' column='1'/>
	- <parameter type-id='type-id-104' name='name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='699' column='1'/>
	- <parameter type-id='type-id-104' name='mountpoint' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='699' column='1'/>
	- <parameter type-id='type-id-106' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='700' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_is_shared' mangled-name='zfs_is_shared' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='680' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_shared'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='680' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='zfs_unmountall' mangled-name='zfs_unmountall' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='663' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unmountall'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='663' column='1'/>
	- <parameter type-id='type-id-6' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='663' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_unmount' mangled-name='zfs_unmount' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='589' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unmount'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='589' column='1'/>
	- <parameter type-id='type-id-104' name='mountpoint' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='589' column='1'/>
	- <parameter type-id='type-id-6' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='589' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_mount_at' mangled-name='zfs_mount_at' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='382' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_mount_at'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='382' column='1'/>
	- <parameter type-id='type-id-104' name='options' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='382' column='1'/>
	- <parameter type-id='type-id-6' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='382' column='1'/>
	- <parameter type-id='type-id-104' name='mountpoint' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='383' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_mount' mangled-name='zfs_mount' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='367' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_mount'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='367' column='1'/>
	- <parameter type-id='type-id-104' name='options' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='367' column='1'/>
	- <parameter type-id='type-id-6' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='367' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_is_mounted' mangled-name='zfs_is_mounted' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='238' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_mounted'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='238' column='1'/>
	- <parameter type-id='type-id-161' name='where' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='238' column='1'/>
	- <return type-id='type-id-5'/>
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	- <function-decl name='is_mounted' mangled-name='is_mounted' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='224' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='is_mounted'>
	- <parameter type-id='type-id-17' name='zfs_hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='224' column='1'/>
	- <parameter type-id='type-id-104' name='special' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='224' column='1'/>
	- <parameter type-id='type-id-161' name='where' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='224' column='1'/>
	- <return type-id='type-id-5'/>
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	- <function-decl name='zfs_is_mountable' mangled-name='zfs_is_mountable' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='265' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_mountable'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='265' column='1'/>
	- <parameter type-id='type-id-23' name='buf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='265' column='1'/>
	- <parameter type-id='type-id-43' name='buflen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='265' column='1'/>
	- <parameter type-id='type-id-140' name='source' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='266' column='1'/>
	- <parameter type-id='type-id-6' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='266' column='1'/>
	- <return type-id='type-id-5'/>
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	- <function-decl name='is_shared' mangled-name='is_shared' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='718' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='is_shared'>
	- <parameter type-id='type-id-104' name='mountpoint' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='718' column='1'/>
	- <parameter type-id='type-id-106' name='proto' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_mount.c' line='718' column='1'/>
	- <return type-id='type-id-184'/>
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	- <function-decl name='zfs_realloc' mangled-name='zfs_realloc' filepath='../../include/libzfs_impl.h' line='140' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='qsort' mangled-name='qsort' filepath='/usr/include/stdlib.h' line='827' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <return type-id='type-id-52'/>
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	- <function-decl name='tpool_create' mangled-name='tpool_create' filepath='../../include/thread_pool.h' line='42' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='tpool_destroy' mangled-name='tpool_destroy' filepath='../../include/thread_pool.h' line='46' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='rmdir' mangled-name='rmdir' filepath='/usr/include/unistd.h' line='834' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='changelist_unshare' mangled-name='changelist_unshare' filepath='../../include/libzfs_impl.h' line='189' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='libzfs_mnttab_find' mangled-name='libzfs_mnttab_find' filepath='../../include/libzfs.h' line='225' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='sa_commit_shares' mangled-name='sa_commit_shares' filepath='../../lib/libspl/include/libshare.h' line='81' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='sa_validate_shareopts' mangled-name='sa_validate_shareopts' filepath='../../lib/libspl/include/libshare.h' line='84' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='sa_enable_share' mangled-name='sa_enable_share' filepath='../../lib/libspl/include/libshare.h' line='77' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='sa_errorstr' mangled-name='sa_errorstr' filepath='../../lib/libspl/include/libshare.h' line='74' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='sa_disable_share' mangled-name='sa_disable_share' filepath='../../lib/libspl/include/libshare.h' line='79' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='libzfs_mnttab_remove' mangled-name='libzfs_mnttab_remove' filepath='../../include/libzfs.h' line='229' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_crypto_get_encryption_root' mangled-name='zfs_crypto_get_encryption_root' filepath='../../include/libzfs.h' line='526' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_crypto_unload_key' mangled-name='zfs_crypto_unload_key' filepath='../../include/libzfs.h' line='533' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='do_unmount' mangled-name='do_unmount' filepath='../../include/libzfs_impl.h' line='246' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_spa_version' mangled-name='zfs_spa_version' filepath='../../include/libzfs.h' line='817' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='__lxstat' mangled-name='__lxstat64' filepath='/usr/include/x86_64-linux-gnu/sys/stat.h' line='412' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='openat' mangled-name='openat64' filepath='/usr/include/fcntl.h' line='196' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='fdopendir' mangled-name='fdopendir' filepath='/usr/include/dirent.h' line='141' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='readdir64' mangled-name='readdir64' filepath='/usr/include/dirent.h' line='173' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='closedir' mangled-name='closedir' filepath='/usr/include/dirent.h' line='149' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='__xstat' mangled-name='__xstat64' filepath='/usr/include/x86_64-linux-gnu/sys/stat.h' line='409' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='statfs64' mangled-name='statfs64' filepath='/usr/include/x86_64-linux-gnu/sys/statfs.h' line='43' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='do_mount' mangled-name='do_mount' filepath='../../include/libzfs_impl.h' line='244' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='libzfs_mnttab_add' mangled-name='libzfs_mnttab_add' filepath='../../include/libzfs.h' line='227' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='mkdirp' mangled-name='mkdirp' filepath='../../lib/libspl/include/libgen.h' line='33' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zfs_crypto_load_key' mangled-name='zfs_crypto_load_key' filepath='../../include/libzfs.h' line='532' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='getprop_uint64' mangled-name='getprop_uint64' filepath='../../include/libzfs.h' line='510' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='sa_is_shared' mangled-name='sa_is_shared' filepath='../../lib/libspl/include/libshare.h' line='80' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	+ <typedef-decl name='mode_t' type-id='e1c52942' id='d50d396c'/>
	+ <typedef-decl name='__compar_fn_t' type-id='585e1de9' id='aba7edd8'/>
	+ <pointer-type-def type-id='54a5d683' size-in-bits='64' id='f09217ba'/>
	+ <pointer-type-def type-id='5725d813' size-in-bits='64' id='07b96073'/>
	+ <pointer-type-def type-id='9b293607' size-in-bits='64' id='77bf1784'/>
	+ <pointer-type-def type-id='7d8569fd' size-in-bits='64' id='7347a39e'/>
	+ <pointer-type-def type-id='aafc373f' size-in-bits='64' id='4330df87'/>
	+ <pointer-type-def type-id='a2a6be1a' size-in-bits='64' id='7fd094c8'/>
	+ <pointer-type-def type-id='b1bbf10d' size-in-bits='64' id='9cf59a50'/>
	+ <pointer-type-def type-id='c5c76c9c' size-in-bits='64' id='b7f9d8e6'/>
	+ <pointer-type-def type-id='9200a744' size-in-bits='64' id='4507922a'/>
	+ <function-decl name='zfs_is_mountable' mangled-name='zfs_is_mountable' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_mountable'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='26a90f95' name='buf'/>
	+ <parameter type-id='b59d7dce' name='buflen'/>
	+ <parameter type-id='debc6aa3' name='source'/>
	+ <parameter type-id='95e97e5e' name='flags'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_mount_at' mangled-name='zfs_mount_at' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_mount_at'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='options'/>
	+ <parameter type-id='95e97e5e' name='flags'/>
	+ <parameter type-id='80f4b756' name='mountpoint'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_unmountall' mangled-name='zfs_unmountall' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unmountall'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='95e97e5e' name='flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='unshare_one' mangled-name='unshare_one' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='unshare_one'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='80f4b756' name='mountpoint'/>
	+ <parameter type-id='a7913f77' name='proto'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='is_shared' mangled-name='is_shared' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='is_shared'>
	+ <parameter type-id='80f4b756' name='mountpoint'/>
	+ <parameter type-id='a7913f77' name='proto'/>
	+ <return type-id='7eb57c2d'/>
	+ </function-decl>
	+ <function-decl name='zfs_share_proto' mangled-name='zfs_share_proto' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_share_proto'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='bf9c30ee' name='proto'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_is_shared_proto' mangled-name='zfs_is_shared_proto' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_shared_proto'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='9b23c9ad' name='where'/>
	+ <parameter type-id='a7913f77' name='proto'/>
	+ <return type-id='7eb57c2d'/>
	+ </function-decl>
	+ <function-decl name='zfs_is_shared_nfs' mangled-name='zfs_is_shared_nfs' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_shared_nfs'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='9b23c9ad' name='where'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_is_shared_smb' mangled-name='zfs_is_shared_smb' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_is_shared_smb'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='9b23c9ad' name='where'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_commit_shares' mangled-name='zfs_commit_shares' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_commit_shares'>
	+ <parameter type-id='80f4b756' name='proto'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_shareall' mangled-name='zfs_shareall' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_shareall'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshareall_nfs' mangled-name='zfs_unshareall_nfs' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshareall_nfs'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshareall_smb' mangled-name='zfs_unshareall_smb' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshareall_smb'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshareall' mangled-name='zfs_unshareall' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshareall'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshare' mangled-name='zfs_unshare' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshare'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshareall_bypath' mangled-name='zfs_unshareall_bypath' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshareall_bypath'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='mountpoint'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_unshareall_bytype' mangled-name='zfs_unshareall_bytype' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_unshareall_bytype'>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <parameter type-id='80f4b756' name='mountpoint'/>
	+ <parameter type-id='80f4b756' name='proto'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libzfs_add_handle' mangled-name='libzfs_add_handle' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_add_handle'>
	+ <parameter type-id='77bf1784' name='cbp'/>
	+ <parameter type-id='9200a744' name='zhp'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_foreach_mountpoint' mangled-name='zfs_foreach_mountpoint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_foreach_mountpoint'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='4507922a' name='handles'/>
	+ <parameter type-id='b59d7dce' name='num_handles'/>
	+ <parameter type-id='d8e49ab9' name='func'/>
	+ <parameter type-id='eaa32e2f' name='data'/>
	+ <parameter type-id='c19b74c3' name='parallel'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_enable_datasets' mangled-name='zpool_enable_datasets' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_enable_datasets'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='mntopts'/>
	+ <parameter type-id='95e97e5e' name='flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_disable_datasets' mangled-name='zpool_unmount_datasets' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_unmount_datasets'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='c19b74c3' name='force'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <var-decl name='proto_table' type-id='b2c36c9f' mangled-name='proto_table' visibility='default' elf-symbol-id='proto_table'/>
	+ <var-decl name='nfs_only' type-id='79c9b3ac' mangled-name='nfs_only' visibility='default' elf-symbol-id='nfs_only'/>
	+ <var-decl name='smb_only' type-id='79c9b3ac' mangled-name='smb_only' visibility='default' elf-symbol-id='smb_only'/>
	+ <var-decl name='share_all_proto' type-id='7dc77b61' mangled-name='share_all_proto' visibility='default' elf-symbol-id='share_all_proto'/>
	+ <function-decl name='do_unmount' mangled-name='do_unmount' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='do_unmount'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='tpool_dispatch' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9cf59a50'/>
	+ <parameter type-id='b7f9d8e6'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fdopendir' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='f09217ba'/>
	+ </function-decl>
	+ <function-decl name='readdir64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='f09217ba'/>
	+ <return type-id='07b96073'/>
	+ </function-decl>
	+ <function-decl name='closedir' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='f09217ba'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='statfs64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='7fd094c8'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='do_mount' mangled-name='do_mount' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='do_mount'>
	+ <parameter type-id='9200a744'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='mkdirp' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='d50d396c'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='sa_disable_share' mangled-name='sa_disable_share' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='sa_disable_share'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='sa_errorstr' mangled-name='sa_errorstr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='sa_errorstr'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='sa_is_shared' mangled-name='sa_is_shared' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='sa_is_shared'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='sa_enable_share' mangled-name='sa_enable_share' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='sa_enable_share'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='sa_validate_shareopts' mangled-name='sa_validate_shareopts' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='sa_validate_shareopts'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='sa_commit_shares' mangled-name='sa_commit_shares' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='sa_commit_shares'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='rmdir' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_realloc' mangled-name='zfs_realloc' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_realloc'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='qsort' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='aba7edd8'/>
	+ <return type-id='48b5725f'/>
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	+ <function-decl name='tpool_create' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='7347a39e'/>
	+ <return type-id='9cf59a50'/>
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	+ <function-decl name='tpool_wait' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9cf59a50'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='tpool_destroy' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9cf59a50'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
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	- <enumerator name='ZPOOL_WAIT_REMOVE' value='4'/>
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	- <enumerator name='ZPOOL_WAIT_TRIM' value='7'/>
	- <enumerator name='ZPOOL_WAIT_NUM_ACTIVITIES' value='8'/>
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	- <function-decl name='zpool_wait_status' mangled-name='zpool_wait_status' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4668' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_wait_status'>
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	- </function-decl>
	- <function-decl name='zpool_wait' mangled-name='zpool_wait' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4641' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_wait'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4641' column='1'/>
	- <parameter type-id='type-id-188' name='activity' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4641' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_obj_to_path_ds' mangled-name='zpool_obj_to_path_ds' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4632' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_obj_to_path_ds'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4632' column='1'/>
	- <parameter type-id='type-id-27' name='dsobj' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4632' column='1'/>
	- <parameter type-id='type-id-27' name='obj' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4632' column='1'/>
	- <parameter type-id='type-id-23' name='pathname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4633' column='1'/>
	- <parameter type-id='type-id-43' name='len' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4633' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zpool_obj_to_path' mangled-name='zpool_obj_to_path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4625' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_obj_to_path'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4632' column='1'/>
	- <parameter type-id='type-id-27' name='dsobj' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4632' column='1'/>
	- <parameter type-id='type-id-27' name='obj' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4632' column='1'/>
	- <parameter type-id='type-id-23' name='pathname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4633' column='1'/>
	- <parameter type-id='type-id-43' name='len' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4633' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zpool_events_seek' mangled-name='zpool_events_seek' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4543' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_events_seek'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4543' column='1'/>
	- <parameter type-id='type-id-27' name='eid' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4543' column='1'/>
	- <parameter type-id='type-id-6' name='zevent_fd' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4543' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_events_clear' mangled-name='zpool_events_clear' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4520' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_events_clear'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4520' column='1'/>
	- <parameter type-id='type-id-141' name='count' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4520' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_events_next' mangled-name='zpool_events_next' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4460' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_events_next'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4460' column='1'/>
	- <parameter type-id='type-id-115' name='nvp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4460' column='1'/>
	- <parameter type-id='type-id-141' name='dropped' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4461' column='1'/>
	- <parameter type-id='type-id-64' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4461' column='1'/>
	- <parameter type-id='type-id-6' name='zevent_fd' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4461' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_get_history' mangled-name='zpool_get_history' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4390' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_history'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4390' column='1'/>
	- <parameter type-id='type-id-115' name='nvhisp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4390' column='1'/>
	- <parameter type-id='type-id-137' name='off' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4390' column='1'/>
	- <parameter type-id='type-id-114' name='eof' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4391' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_log_history' mangled-name='zpool_log_history' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4321' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_log_history'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4321' column='1'/>
	- <parameter type-id='type-id-104' name='message' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4321' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_save_arguments' mangled-name='zfs_save_arguments' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4309' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_save_arguments'>
	- <parameter type-id='type-id-6' name='argc' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4309' column='1'/>
	- <parameter type-id='type-id-161' name='argv' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4309' column='1'/>
	- <parameter type-id='type-id-23' name='string' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4309' column='1'/>
	- <parameter type-id='type-id-6' name='len' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4309' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zpool_upgrade' mangled-name='zpool_upgrade' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4293' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_upgrade'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4293' column='1'/>
	- <parameter type-id='type-id-27' name='new_version' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4293' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_get_errlog' mangled-name='zpool_get_errlog' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4194' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_errlog'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4194' column='1'/>
	- <parameter type-id='type-id-115' name='nverrlistp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4194' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_name' mangled-name='zpool_vdev_name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4069' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_name'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4069' column='1'/>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4069' column='1'/>
	- <parameter type-id='type-id-22' name='nv' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4069' column='1'/>
	- <parameter type-id='type-id-6' name='name_flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4070' column='1'/>
	- <return type-id='type-id-23'/>
	- </function-decl>
	- <function-decl name='zpool_sync_one' mangled-name='zpool_sync_one' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4032' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_sync_one'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4032' column='1'/>
	- <parameter type-id='type-id-42' name='data' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4032' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_reopen_one' mangled-name='zpool_reopen_one' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4014' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_reopen_one'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4014' column='1'/>
	- <parameter type-id='type-id-42' name='data' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4014' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_reguid' mangled-name='zpool_reguid' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3994' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_reguid'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3994' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_clear' mangled-name='zpool_vdev_clear' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3970' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_clear'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3970' column='1'/>
	- <parameter type-id='type-id-27' name='guid' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3970' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_clear' mangled-name='zpool_clear' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3894' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_clear'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3894' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3894' column='1'/>
	- <parameter type-id='type-id-22' name='rewindnvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3894' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_indirect_size' mangled-name='zpool_vdev_indirect_size' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3861' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_indirect_size'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3861' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3861' column='1'/>
	- <parameter type-id='type-id-137' name='sizep' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3862' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_remove_cancel' mangled-name='zpool_vdev_remove_cancel' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3841' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_remove_cancel'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3994' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_remove' mangled-name='zpool_vdev_remove' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3769' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_remove'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3769' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3769' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <class-decl name='splitflags' size-in-bits='64' is-struct='yes' visibility='default' filepath='../../include/libzfs.h' line='258' column='1' id='type-id-189'>
	- <data-member access='public' layout-offset-in-bits='31'>
	- <var-decl name='dryrun' type-id='type-id-6' visibility='default' filepath='../../include/libzfs.h' line='260' column='1'/>
	- </data-member>
	- <data-member access='public' layout-offset-in-bits='30'>
	- <var-decl name='import' type-id='type-id-6' visibility='default' filepath='../../include/libzfs.h' line='263' column='1'/>
	- </data-member>
	- <data-member access='public' layout-offset-in-bits='32'>
	- <var-decl name='name_flags' type-id='type-id-6' visibility='default' filepath='../../include/libzfs.h' line='264' column='1'/>
	- </data-member>
	- </class-decl>
	- <typedef-decl name='splitflags_t' type-id='type-id-189' filepath='../../include/libzfs.h' line='265' column='1' id='type-id-190'/>
	- <function-decl name='zpool_vdev_split' mangled-name='zpool_vdev_split' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3525' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_split'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3525' column='1'/>
	- <parameter type-id='type-id-23' name='newname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3525' column='1'/>
	- <parameter type-id='type-id-115' name='newroot' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3525' column='1'/>
	- <parameter type-id='type-id-22' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3526' column='1'/>
	- <parameter type-id='type-id-190' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3526' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_detach' mangled-name='zpool_vdev_detach' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3428' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_detach'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3428' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3428' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_attach' mangled-name='zpool_vdev_attach' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3255' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_attach'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3255' column='1'/>
	- <parameter type-id='type-id-104' name='old_disk' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3255' column='1'/>
	- <parameter type-id='type-id-104' name='new_disk' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3256' column='1'/>
	- <parameter type-id='type-id-22' name='nvroot' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3256' column='1'/>
	- <parameter type-id='type-id-6' name='replacing' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3256' column='1'/>
	- <parameter type-id='type-id-5' name='rebuild' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3256' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <enum-decl name='vdev_aux' filepath='../../include/sys/fs/zfs.h' line='884' column='1' id='type-id-191'>
	- <underlying-type type-id='type-id-7'/>
	+ <typedef-decl name='vdev_aux_t' type-id='7f5bcca4' id='9d774e0b'/>
	+ <enum-decl name='vdev_aux' id='7f5bcca4'>
	+ <underlying-type type-id='9cac1fee'/>
	<enumerator name='VDEV_AUX_NONE' value='0'/>
	<enumerator name='VDEV_AUX_OPEN_FAILED' value='1'/>
	<enumerator name='VDEV_AUX_CORRUPT_DATA' value='2'/>
	<enumerator name='VDEV_AUX_NO_REPLICAS' value='3'/>
	<enumerator name='VDEV_AUX_BAD_GUID_SUM' value='4'/>
	<enumerator name='VDEV_AUX_TOO_SMALL' value='5'/>
	<enumerator name='VDEV_AUX_BAD_LABEL' value='6'/>
	<enumerator name='VDEV_AUX_VERSION_NEWER' value='7'/>
	<enumerator name='VDEV_AUX_VERSION_OLDER' value='8'/>
	<enumerator name='VDEV_AUX_UNSUP_FEAT' value='9'/>
	<enumerator name='VDEV_AUX_SPARED' value='10'/>
	<enumerator name='VDEV_AUX_ERR_EXCEEDED' value='11'/>
	<enumerator name='VDEV_AUX_IO_FAILURE' value='12'/>
	<enumerator name='VDEV_AUX_BAD_LOG' value='13'/>
	<enumerator name='VDEV_AUX_EXTERNAL' value='14'/>
	<enumerator name='VDEV_AUX_SPLIT_POOL' value='15'/>
	<enumerator name='VDEV_AUX_BAD_ASHIFT' value='16'/>
	<enumerator name='VDEV_AUX_EXTERNAL_PERSIST' value='17'/>
	<enumerator name='VDEV_AUX_ACTIVE' value='18'/>
	<enumerator name='VDEV_AUX_CHILDREN_OFFLINE' value='19'/>
	<enumerator name='VDEV_AUX_ASHIFT_TOO_BIG' value='20'/>
	</enum-decl>
	- <typedef-decl name='vdev_aux_t' type-id='type-id-191' filepath='../../include/sys/fs/zfs.h' line='906' column='1' id='type-id-192'/>
	- <function-decl name='zpool_vdev_degrade' mangled-name='zpool_vdev_degrade' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3201' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_degrade'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3201' column='1'/>
	- <parameter type-id='type-id-27' name='guid' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3201' column='1'/>
	- <parameter type-id='type-id-192' name='aux' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3201' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_fault' mangled-name='zpool_vdev_fault' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3166' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_fault'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3166' column='1'/>
	- <parameter type-id='type-id-27' name='guid' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3166' column='1'/>
	- <parameter type-id='type-id-192' name='aux' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3166' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_offline' mangled-name='zpool_vdev_offline' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3116' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_offline'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3116' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3116' column='1'/>
	- <parameter type-id='type-id-5' name='istmp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3116' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <enum-decl name='vdev_state' filepath='../../include/sys/fs/zfs.h' line='867' column='1' id='type-id-193'>
	- <underlying-type type-id='type-id-7'/>
	- <enumerator name='VDEV_STATE_UNKNOWN' value='0'/>
	- <enumerator name='VDEV_STATE_CLOSED' value='1'/>
	- <enumerator name='VDEV_STATE_OFFLINE' value='2'/>
	- <enumerator name='VDEV_STATE_REMOVED' value='3'/>
	- <enumerator name='VDEV_STATE_CANT_OPEN' value='4'/>
	- <enumerator name='VDEV_STATE_FAULTED' value='5'/>
	- <enumerator name='VDEV_STATE_DEGRADED' value='6'/>
	- <enumerator name='VDEV_STATE_HEALTHY' value='7'/>
	- </enum-decl>
	- <typedef-decl name='vdev_state_t' type-id='type-id-193' filepath='../../include/sys/fs/zfs.h' line='876' column='1' id='type-id-194'/>
	- <pointer-type-def type-id='type-id-194' size-in-bits='64' id='type-id-195'/>
	- <function-decl name='zpool_vdev_online' mangled-name='zpool_vdev_online' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3029' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_online'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3029' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3029' column='1'/>
	- <parameter type-id='type-id-6' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3029' column='1'/>
	- <parameter type-id='type-id-195' name='newstate' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3030' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_vdev_path_to_guid' mangled-name='zpool_vdev_path_to_guid' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3019' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_path_to_guid'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3019' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='3019' column='1'/>
	- <return type-id='type-id-27'/>
	- </function-decl>
	- <function-decl name='zpool_get_physpath' mangled-name='zpool_get_physpath' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2981' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_physpath'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2981' column='1'/>
	- <parameter type-id='type-id-23' name='physpath' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2981' column='1'/>
	- <parameter type-id='type-id-43' name='phypath_size' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2981' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_find_vdev' mangled-name='zpool_find_vdev' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2808' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_find_vdev'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2808' column='1'/>
	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2808' column='1'/>
	- <parameter type-id='type-id-114' name='avail_spare' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2808' column='1'/>
	- <parameter type-id='type-id-114' name='l2cache' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2809' column='1'/>
	- <parameter type-id='type-id-114' name='log' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2809' column='1'/>
	- <return type-id='type-id-22'/>
	- </function-decl>
	- <function-decl name='zpool_find_vdev_by_physpath' mangled-name='zpool_find_vdev_by_physpath' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2757' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_find_vdev_by_physpath'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2757' column='1'/>
	- <parameter type-id='type-id-104' name='ppath' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2757' column='1'/>
	- <parameter type-id='type-id-114' name='avail_spare' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2758' column='1'/>
	- <parameter type-id='type-id-114' name='l2cache' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2758' column='1'/>
	- <parameter type-id='type-id-114' name='log' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2758' column='1'/>
	- <return type-id='type-id-22'/>
	- </function-decl>
	- <enum-decl name='pool_scan_func' filepath='../../include/sys/fs/zfs.h' line='938' column='1' id='type-id-196'>
	- <underlying-type type-id='type-id-7'/>
	+ <typedef-decl name='pool_scan_func_t' type-id='1b092565' id='7313fbe2'/>
	+ <enum-decl name='pool_scan_func' id='1b092565'>
	+ <underlying-type type-id='9cac1fee'/>
	<enumerator name='POOL_SCAN_NONE' value='0'/>
	<enumerator name='POOL_SCAN_SCRUB' value='1'/>
	<enumerator name='POOL_SCAN_RESILVER' value='2'/>
	<enumerator name='POOL_SCAN_FUNCS' value='3'/>
	</enum-decl>
	- <typedef-decl name='pool_scan_func_t' type-id='type-id-196' filepath='../../include/sys/fs/zfs.h' line='943' column='1' id='type-id-197'/>
	- <enum-decl name='pool_scrub_cmd' filepath='../../include/sys/fs/zfs.h' line='948' column='1' id='type-id-198'>
	- <underlying-type type-id='type-id-7'/>
	+ <typedef-decl name='pool_scrub_cmd_t' type-id='a1474cbd' id='b51cf3c2'/>
	+ <enum-decl name='pool_scrub_cmd' id='a1474cbd'>
	+ <underlying-type type-id='9cac1fee'/>
	<enumerator name='POOL_SCRUB_NORMAL' value='0'/>
	<enumerator name='POOL_SCRUB_PAUSE' value='1'/>
	<enumerator name='POOL_SCRUB_FLAGS_END' value='2'/>
	</enum-decl>
	- <typedef-decl name='pool_scrub_cmd_t' type-id='type-id-198' filepath='../../include/sys/fs/zfs.h' line='952' column='1' id='type-id-199'/>
	- <function-decl name='zpool_scan' mangled-name='zpool_scan' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2482' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_scan'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2482' column='1'/>
	- <parameter type-id='type-id-197' name='func' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2482' column='1'/>
	- <parameter type-id='type-id-199' name='cmd' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2482' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <enum-decl name='pool_trim_func' filepath='../../include/sys/fs/zfs.h' line='1177' column='1' id='type-id-200'>
	- <underlying-type type-id='type-id-7'/>
	+ <typedef-decl name='pool_trim_func_t' type-id='54ed608a' id='b1146b8d'/>
	+ <enum-decl name='pool_trim_func' id='54ed608a'>
	+ <underlying-type type-id='9cac1fee'/>
	<enumerator name='POOL_TRIM_START' value='0'/>
	<enumerator name='POOL_TRIM_CANCEL' value='1'/>
	<enumerator name='POOL_TRIM_SUSPEND' value='2'/>
	<enumerator name='POOL_TRIM_FUNCS' value='3'/>
	</enum-decl>
	- <typedef-decl name='pool_trim_func_t' type-id='type-id-200' filepath='../../include/sys/fs/zfs.h' line='1182' column='1' id='type-id-201'/>
	- <class-decl name='trimflags' size-in-bits='192' is-struct='yes' visibility='default' filepath='../../include/libzfs.h' line='267' column='1' id='type-id-202'>
	+ <typedef-decl name='trimflags_t' type-id='8ef58008' id='a093cbb8'/>
	+ <class-decl name='trimflags' size-in-bits='192' is-struct='yes' visibility='default' id='8ef58008'>
	<data-member access='public' layout-offset-in-bits='0'>
	- <var-decl name='fullpool' type-id='type-id-5' visibility='default' filepath='../../include/libzfs.h' line='269' column='1'/>
	+ <var-decl name='fullpool' type-id='c19b74c3' visibility='default'/>
	</data-member>
	<data-member access='public' layout-offset-in-bits='32'>
	- <var-decl name='secure' type-id='type-id-5' visibility='default' filepath='../../include/libzfs.h' line='272' column='1'/>
	+ <var-decl name='secure' type-id='c19b74c3' visibility='default'/>
	</data-member>
	<data-member access='public' layout-offset-in-bits='64'>
	- <var-decl name='wait' type-id='type-id-5' visibility='default' filepath='../../include/libzfs.h' line='275' column='1'/>
	+ <var-decl name='wait' type-id='c19b74c3' visibility='default'/>
	</data-member>
	<data-member access='public' layout-offset-in-bits='128'>
	- <var-decl name='rate' type-id='type-id-27' visibility='default' filepath='../../include/libzfs.h' line='278' column='1'/>
	+ <var-decl name='rate' type-id='9c313c2d' visibility='default'/>
	</data-member>
	</class-decl>
	- <typedef-decl name='trimflags_t' type-id='type-id-202' filepath='../../include/libzfs.h' line='279' column='1' id='type-id-203'/>
	- <pointer-type-def type-id='type-id-203' size-in-bits='64' id='type-id-204'/>
	- <function-decl name='zpool_trim' mangled-name='zpool_trim' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2426' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_trim'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2426' column='1'/>
	- <parameter type-id='type-id-201' name='cmd_type' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2426' column='1'/>
	- <parameter type-id='type-id-22' name='vds' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2426' column='1'/>
	- <parameter type-id='type-id-204' name='trim_flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2427' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <enum-decl name='pool_initialize_func' filepath='../../include/sys/fs/zfs.h' line='1167' column='1' id='type-id-205'>
	- <underlying-type type-id='type-id-7'/>
	+ <typedef-decl name='pool_initialize_func_t' type-id='5c246ad4' id='7063e1ab'/>
	+ <enum-decl name='pool_initialize_func' id='5c246ad4'>
	+ <underlying-type type-id='9cac1fee'/>
	<enumerator name='POOL_INITIALIZE_START' value='0'/>
	<enumerator name='POOL_INITIALIZE_CANCEL' value='1'/>
	<enumerator name='POOL_INITIALIZE_SUSPEND' value='2'/>
	<enumerator name='POOL_INITIALIZE_FUNCS' value='3'/>
	</enum-decl>
	- <typedef-decl name='pool_initialize_func_t' type-id='type-id-205' filepath='../../include/sys/fs/zfs.h' line='1172' column='1' id='type-id-206'/>
	- <function-decl name='zpool_initialize_wait' mangled-name='zpool_initialize_wait' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2317' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_initialize_wait'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2317' column='1'/>
	- <parameter type-id='type-id-206' name='cmd_type' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2317' column='1'/>
	- <parameter type-id='type-id-22' name='vds' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2318' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_initialize' mangled-name='zpool_initialize' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2310' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_initialize'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2317' column='1'/>
	- <parameter type-id='type-id-206' name='cmd_type' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2317' column='1'/>
	- <parameter type-id='type-id-22' name='vds' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='2318' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_import_props' mangled-name='zpool_import_props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1921' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_import_props'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1921' column='1'/>
	- <parameter type-id='type-id-22' name='config' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1921' column='1'/>
	- <parameter type-id='type-id-104' name='newname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1921' column='1'/>
	- <parameter type-id='type-id-22' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1922' column='1'/>
	- <parameter type-id='type-id-6' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1922' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_print_unsup_feat' mangled-name='zpool_print_unsup_feat' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1890' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_print_unsup_feat'>
	- <parameter type-id='type-id-22' name='config' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1890' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zpool_import' mangled-name='zpool_import' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1832' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_import'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1832' column='1'/>
	- <parameter type-id='type-id-22' name='config' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1832' column='1'/>
	- <parameter type-id='type-id-104' name='newname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1832' column='1'/>
	- <parameter type-id='type-id-23' name='altroot' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1833' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_explain_recover' mangled-name='zpool_explain_recover' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1745' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_explain_recover'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1745' column='1'/>
	- <parameter type-id='type-id-104' name='name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1745' column='1'/>
	- <parameter type-id='type-id-6' name='reason' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1745' column='1'/>
	- <parameter type-id='type-id-22' name='config' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1746' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zpool_export_force' mangled-name='zpool_export_force' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1687' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_export_force'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1687' column='1'/>
	- <parameter type-id='type-id-104' name='log_str' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1687' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_export' mangled-name='zpool_export' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1681' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_export'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1681' column='1'/>
	- <parameter type-id='type-id-5' name='force' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1681' column='1'/>
	- <parameter type-id='type-id-104' name='log_str' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1681' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_add' mangled-name='zpool_add' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1537' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_add'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1537' column='1'/>
	- <parameter type-id='type-id-22' name='nvroot' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1537' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_discard_checkpoint' mangled-name='zpool_discard_checkpoint' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1515' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_discard_checkpoint'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1515' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_checkpoint' mangled-name='zpool_checkpoint' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1494' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_checkpoint'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1515' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_destroy' mangled-name='zpool_destroy' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1451' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_destroy'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1451' column='1'/>
	- <parameter type-id='type-id-104' name='log_str' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1451' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_create' mangled-name='zpool_create' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1272' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_create'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1272' column='1'/>
	- <parameter type-id='type-id-104' name='pool' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1272' column='1'/>
	- <parameter type-id='type-id-22' name='nvroot' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1272' column='1'/>
	- <parameter type-id='type-id-22' name='props' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1273' column='1'/>
	- <parameter type-id='type-id-22' name='fsprops' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1273' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_is_draid_spare' mangled-name='zpool_is_draid_spare' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1253' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_is_draid_spare'>
	- <parameter type-id='type-id-104' name='name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1253' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='zpool_get_state' mangled-name='zpool_get_state' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1182' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_state'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1182' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_get_name' mangled-name='zpool_get_name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1172' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_name'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1172' column='1'/>
	- <return type-id='type-id-104'/>
	- </function-decl>
	- <function-decl name='zpool_close' mangled-name='zpool_close' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1160' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_close'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1160' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zpool_open' mangled-name='zpool_open' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1139' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_open'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1139' column='1'/>
	- <parameter type-id='type-id-104' name='pool' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1139' column='1'/>
	- <return type-id='type-id-18'/>
	- </function-decl>
	- <pointer-type-def type-id='type-id-18' size-in-bits='64' id='type-id-207'/>
	- <function-decl name='zpool_open_silent' mangled-name='zpool_open_silent' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1108' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_open_silent'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1108' column='1'/>
	- <parameter type-id='type-id-104' name='pool' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1108' column='1'/>
	- <parameter type-id='type-id-207' name='ret' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1108' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_open_canfail' mangled-name='zpool_open_canfail' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1066' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_open_canfail'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1066' column='1'/>
	- <parameter type-id='type-id-104' name='pool' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='1066' column='1'/>
	- <return type-id='type-id-18'/>
	- </function-decl>
	- <function-decl name='zpool_name_valid' mangled-name='zpool_name_valid' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='967' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_name_valid'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='967' column='1'/>
	- <parameter type-id='type-id-5' name='isopen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='967' column='1'/>
	- <parameter type-id='type-id-104' name='pool' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='967' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='zpool_prop_get_feature' mangled-name='zpool_prop_get_feature' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='905' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_get_feature'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='905' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='905' column='1'/>
	- <parameter type-id='type-id-23' name='buf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='905' column='1'/>
	- <parameter type-id='type-id-43' name='len' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='906' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_expand_proplist' mangled-name='zpool_expand_proplist' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='807' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_expand_proplist'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='807' column='1'/>
	- <parameter type-id='type-id-132' name='plp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='807' column='1'/>
	- <parameter type-id='type-id-5' name='literal' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='808' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_set_prop' mangled-name='zpool_set_prop' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='751' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_set_prop'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='751' column='1'/>
	- <parameter type-id='type-id-104' name='propname' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='751' column='1'/>
	- <parameter type-id='type-id-104' name='propval' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='751' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <enum-decl name='__anonymous_enum__' is-anonymous='yes' filepath='../../include/sys/fs/zfs.h' line='215' column='1' id='type-id-208'>
	- <underlying-type type-id='type-id-7'/>
	- <enumerator name='ZPOOL_PROP_INVAL' value='-1'/>
	- <enumerator name='ZPOOL_PROP_NAME' value='0'/>
	- <enumerator name='ZPOOL_PROP_SIZE' value='1'/>
	- <enumerator name='ZPOOL_PROP_CAPACITY' value='2'/>
	- <enumerator name='ZPOOL_PROP_ALTROOT' value='3'/>
	- <enumerator name='ZPOOL_PROP_HEALTH' value='4'/>
	- <enumerator name='ZPOOL_PROP_GUID' value='5'/>
	- <enumerator name='ZPOOL_PROP_VERSION' value='6'/>
	- <enumerator name='ZPOOL_PROP_BOOTFS' value='7'/>
	- <enumerator name='ZPOOL_PROP_DELEGATION' value='8'/>
	- <enumerator name='ZPOOL_PROP_AUTOREPLACE' value='9'/>
	- <enumerator name='ZPOOL_PROP_CACHEFILE' value='10'/>
	- <enumerator name='ZPOOL_PROP_FAILUREMODE' value='11'/>
	- <enumerator name='ZPOOL_PROP_LISTSNAPS' value='12'/>
	- <enumerator name='ZPOOL_PROP_AUTOEXPAND' value='13'/>
	- <enumerator name='ZPOOL_PROP_DEDUPDITTO' value='14'/>
	- <enumerator name='ZPOOL_PROP_DEDUPRATIO' value='15'/>
	- <enumerator name='ZPOOL_PROP_FREE' value='16'/>
	- <enumerator name='ZPOOL_PROP_ALLOCATED' value='17'/>
	- <enumerator name='ZPOOL_PROP_READONLY' value='18'/>
	- <enumerator name='ZPOOL_PROP_ASHIFT' value='19'/>
	- <enumerator name='ZPOOL_PROP_COMMENT' value='20'/>
	- <enumerator name='ZPOOL_PROP_EXPANDSZ' value='21'/>
	- <enumerator name='ZPOOL_PROP_FREEING' value='22'/>
	- <enumerator name='ZPOOL_PROP_FRAGMENTATION' value='23'/>
	- <enumerator name='ZPOOL_PROP_LEAKED' value='24'/>
	- <enumerator name='ZPOOL_PROP_MAXBLOCKSIZE' value='25'/>
	- <enumerator name='ZPOOL_PROP_TNAME' value='26'/>
	- <enumerator name='ZPOOL_PROP_MAXDNODESIZE' value='27'/>
	- <enumerator name='ZPOOL_PROP_MULTIHOST' value='28'/>
	- <enumerator name='ZPOOL_PROP_CHECKPOINT' value='29'/>
	- <enumerator name='ZPOOL_PROP_LOAD_GUID' value='30'/>
	- <enumerator name='ZPOOL_PROP_AUTOTRIM' value='31'/>
	- <enumerator name='ZPOOL_PROP_COMPATIBILITY' value='32'/>
	- <enumerator name='ZPOOL_NUM_PROPS' value='33'/>
	- </enum-decl>
	- <typedef-decl name='zpool_prop_t' type-id='type-id-208' filepath='../../include/sys/fs/zfs.h' line='251' column='1' id='type-id-209'/>
	- <function-decl name='zpool_get_prop' mangled-name='zpool_get_prop' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='284' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_prop'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='284' column='1'/>
	- <parameter type-id='type-id-209' name='prop' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='284' column='1'/>
	- <parameter type-id='type-id-23' name='buf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='284' column='1'/>
	- <parameter type-id='type-id-43' name='len' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='285' column='1'/>
	- <parameter type-id='type-id-140' name='srctype' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='285' column='1'/>
	- <parameter type-id='type-id-5' name='literal' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='285' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_pool_state_to_name' mangled-name='zpool_pool_state_to_name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='221' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_pool_state_to_name'>
	- <parameter type-id='type-id-172' name='state' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='221' column='1'/>
	- <return type-id='type-id-104'/>
	- </function-decl>
	- <function-decl name='zpool_state_to_name' mangled-name='zpool_state_to_name' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='188' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_state_to_name'>
	- <parameter type-id='type-id-194' name='state' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='188' column='1'/>
	- <parameter type-id='type-id-192' name='aux' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='188' column='1'/>
	- <return type-id='type-id-104'/>
	- </function-decl>
	- <function-decl name='zpool_get_prop_int' mangled-name='zpool_get_prop_int' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='146' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_prop_int'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='146' column='1'/>
	- <parameter type-id='type-id-209' name='prop' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='146' column='1'/>
	- <parameter type-id='type-id-140' name='src' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='146' column='1'/>
	- <return type-id='type-id-27'/>
	- </function-decl>
	- <function-decl name='zpool_props_refresh' mangled-name='zpool_props_refresh' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='106' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_props_refresh'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='106' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zpool_get_state_str' mangled-name='zpool_get_state_str' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='252' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_state_str'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='252' column='1'/>
	- <return type-id='type-id-104'/>
	- </function-decl>
	- <enum-decl name='__anonymous_enum__' is-anonymous='yes' filepath='../../include/libzfs.h' line='924' column='1' id='type-id-210'>
	- <underlying-type type-id='type-id-7'/>
	- <enumerator name='ZPOOL_COMPATIBILITY_OK' value='0'/>
	- <enumerator name='ZPOOL_COMPATIBILITY_WARNTOKEN' value='1'/>
	- <enumerator name='ZPOOL_COMPATIBILITY_BADTOKEN' value='2'/>
	- <enumerator name='ZPOOL_COMPATIBILITY_BADFILE' value='3'/>
	- <enumerator name='ZPOOL_COMPATIBILITY_NOFILES' value='4'/>
	- </enum-decl>
	- <typedef-decl name='zpool_compat_status_t' type-id='type-id-210' filepath='../../include/libzfs.h' line='930' column='1' id='type-id-211'/>
	- <function-decl name='zpool_load_compat' mangled-name='zpool_load_compat' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4751' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_load_compat'>
	- <parameter type-id='type-id-104' name='compat' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4751' column='1'/>
	- <parameter type-id='type-id-114' name='features' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4751' column='1'/>
	- <parameter type-id='type-id-23' name='report' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4751' column='1'/>
	- <parameter type-id='type-id-43' name='rlen' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_pool.c' line='4752' column='1'/>
	- <return type-id='type-id-211'/>
	- </function-decl>
	- <function-decl name='lzc_get_bootenv' mangled-name='lzc_get_bootenv' filepath='../../include/libzfs_core.h' line='139' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zpool_standard_error_fmt' mangled-name='zpool_standard_error_fmt' filepath='../../include/libzfs_impl.h' line='149' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='lzc_set_bootenv' mangled-name='lzc_set_bootenv' filepath='../../include/libzfs_core.h' line='138' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='lzc_wait' mangled-name='lzc_wait' filepath='../../include/libzfs_core.h' line='134' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='zpool_history_unpack' mangled-name='zpool_history_unpack' filepath='../../include/libzutil.h' line='144' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='nvlist_add_nvlist_array' mangled-name='nvlist_add_nvlist_array' filepath='../../include/sys/nvpair.h' line='192' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <var-decl name='saved' type-id='type-id-5' visibility='default' filepath='../../include/libzfs.h' line='713' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='32'>
	+ <var-decl name='name_flags' type-id='95e97e5e' visibility='default'/>
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	- <function-decl name='zfs_send_one' mangled-name='zfs_send_one' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='2395' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_send_one'>
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	- <parameter type-id='type-id-218' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='2395' column='1'/>
	- <parameter type-id='type-id-104' name='redactbook' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='2396' column='1'/>
	- <return type-id='type-id-6'/>
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	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_send_saved' mangled-name='zfs_send_saved' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='1868' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_send_saved'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='1868' column='1'/>
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	- <parameter type-id='type-id-104' name='resume_token' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='1869' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_send_resume' mangled-name='zfs_send_resume' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='1842' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_send_resume'>
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	- <parameter type-id='type-id-6' name='outfd' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='1842' column='1'/>
	- <parameter type-id='type-id-104' name='resume_token' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='1843' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='zfs_send_resume_token_to_nvlist' mangled-name='zfs_send_resume_token_to_nvlist' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='1369' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_send_resume_token_to_nvlist'>
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	- <parameter type-id='type-id-104' name='token' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='1369' column='1'/>
	- <return type-id='type-id-22'/>
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	- <parameter type-id='type-id-6' name='fd' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='883' column='1'/>
	- <parameter type-id='type-id-137' name='bytes_written' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='883' column='1'/>
	- <parameter type-id='type-id-137' name='blocks_visited' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_sendrecv.c' line='884' column='1'/>
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	- </function-decl>
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	- <function-decl name='fletcher_4_incremental_byteswap' mangled-name='fletcher_4_incremental_byteswap' filepath='../../include/zfs_fletcher.h' line='60' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- </function-decl>
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	- <function-decl name='lzc_send_redacted' mangled-name='lzc_send_redacted' filepath='../../include/libzfs_core.h' line='92' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='lzc_send_space_resume_redacted' mangled-name='lzc_send_space_resume_redacted' filepath='../../include/libzfs_core.h' line='110' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zcmd_write_src_nvlist' mangled-name='zcmd_write_src_nvlist' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1235' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zcmd_write_src_nvlist'>
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	- <parameter type-id='type-id-158' name='zc' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1235' column='1'/>
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	- <function-decl name='zcmd_write_conf_nvlist' mangled-name='zcmd_write_conf_nvlist' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1228' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zcmd_write_conf_nvlist'>
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	- <parameter type-id='type-id-158' name='zc' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1235' column='1'/>
	- <parameter type-id='type-id-22' name='nvl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1235' column='1'/>
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	- <function-decl name='zcmd_free_nvlists' mangled-name='zcmd_free_nvlists' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1197' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zcmd_free_nvlists'>
	- <parameter type-id='type-id-158' name='zc' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1197' column='1'/>
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	- <function-decl name='zcmd_expand_dst_nvlist' mangled-name='zcmd_expand_dst_nvlist' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1182' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zcmd_expand_dst_nvlist'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1182' column='1'/>
	- <parameter type-id='type-id-158' name='zc' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1182' column='1'/>
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	- <function-decl name='zcmd_alloc_dst_nvlist' mangled-name='zcmd_alloc_dst_nvlist' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1163' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zcmd_alloc_dst_nvlist'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1163' column='1'/>
	- <parameter type-id='type-id-158' name='zc' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1163' column='1'/>
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	- <function-decl name='zfs_path_to_zhandle' mangled-name='zfs_path_to_zhandle' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1130' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_path_to_zhandle'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1130' column='1'/>
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	- <parameter type-id='type-id-20' name='argtype' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1130' column='1'/>
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	- <function-decl name='zfs_get_pool_handle' mangled-name='zfs_get_pool_handle' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1118' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_pool_handle'>
	- <parameter type-id='type-id-136' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1118' column='1'/>
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	- <function-decl name='zfs_get_handle' mangled-name='zfs_get_handle' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1112' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_get_handle'>
	- <parameter type-id='type-id-102' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1112' column='1'/>
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	- <function-decl name='zpool_get_handle' mangled-name='zpool_get_handle' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1106' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_handle'>
	- <parameter type-id='type-id-18' name='zhp' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1106' column='1'/>
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	- <function-decl name='libzfs_fini' mangled-name='libzfs_fini' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1087' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_fini'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1087' column='1'/>
	- <return type-id='type-id-52'/>
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	- <function-decl name='libzfs_init' mangled-name='libzfs_init' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='1003' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_init'>
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	- <parameter type-id='type-id-23' name='envvar' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='991' column='1'/>
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	- <function-decl name='libzfs_free_str_array' mangled-name='libzfs_free_str_array' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='976' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_free_str_array'>
	- <parameter type-id='type-id-161' name='strs' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='976' column='1'/>
	- <parameter type-id='type-id-6' name='count' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='976' column='1'/>
	- <return type-id='type-id-52'/>
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	- <parameter type-id='type-id-104' name='path' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='964' column='1'/>
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	- <parameter type-id='type-id-246' name='lines' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='965' column='1'/>
	- <parameter type-id='type-id-141' name='lines_cnt' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='965' column='1'/>
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	- <parameter type-id='type-id-246' name='lines' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='965' column='1'/>
	- <parameter type-id='type-id-141' name='lines_cnt' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='965' column='1'/>
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	- <function-decl name='libzfs_run_process' mangled-name='libzfs_run_process' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='941' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_run_process'>
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	- <parameter type-id='type-id-161' name='argv' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='941' column='1'/>
	- <parameter type-id='type-id-6' name='flags' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='941' column='1'/>
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	- <function-decl name='libzfs_print_on_error' mangled-name='libzfs_print_on_error' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='823' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_print_on_error'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='865' column='1'/>
	- <parameter type-id='type-id-5' name='enable' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_dataset.c' line='865' column='1'/>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zfs_strdup' mangled-name='zfs_strdup' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='812' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_strdup'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='812' column='1'/>
	- <parameter type-id='type-id-104' name='str' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='812' column='1'/>
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	- <function-decl name='zfs_realloc' mangled-name='zfs_realloc' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='795' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_realloc'>
	- <parameter type-id='type-id-17' name='hdl' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='795' column='1'/>
	- <parameter type-id='type-id-42' name='ptr' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='795' column='1'/>
	- <parameter type-id='type-id-43' name='oldsize' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='795' column='1'/>
	- <parameter type-id='type-id-43' name='newsize' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='795' column='1'/>
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	- <function-decl name='zfs_asprintf' mangled-name='zfs_asprintf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='773' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_asprintf'>
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	- <parameter type-id='type-id-104' name='fmt' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='773' column='1'/>
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	- <parameter type-id='type-id-6' name='error' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='615' column='1'/>
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	- <function-decl name='zfs_setprop_error' mangled-name='zfs_setprop_error' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='496' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_setprop_error'>
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	- <parameter type-id='type-id-6' name='err' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='496' column='1'/>
	- <parameter type-id='type-id-23' name='errbuf' filepath='/home/colm/src/zfs/zfs/lib/libzfs/libzfs_util.c' line='497' column='1'/>
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	- <abi-instr version='1.0' address-size='64' path='os/linux/libzfs_sendrecv_os.c' comp-dir-path='/home/colm/src/zfs/zfs/lib/libzfs' language='LANG_C99'>
	- <function-decl name='libzfs_set_pipe_max' mangled-name='libzfs_set_pipe_max' filepath='os/linux/libzfs_sendrecv_os.c' line='36' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_set_pipe_max'>
	- <parameter type-id='type-id-6' name='infd' filepath='os/linux/libzfs_sendrecv_os.c' line='36' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='fscanf' mangled-name='fscanf' filepath='/usr/include/stdio.h' line='391' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='fcntl' mangled-name='fcntl64' filepath='/usr/include/fcntl.h' line='151' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	+ <enumerator name='ZPOOL_STATUS_FAULTED_DEV_R' value='20'/>
	+ <enumerator name='ZPOOL_STATUS_FAULTED_DEV_NR' value='21'/>
	+ <enumerator name='ZPOOL_STATUS_VERSION_OLDER' value='22'/>
	+ <enumerator name='ZPOOL_STATUS_FEAT_DISABLED' value='23'/>
	+ <enumerator name='ZPOOL_STATUS_RESILVERING' value='24'/>
	+ <enumerator name='ZPOOL_STATUS_OFFLINE_DEV' value='25'/>
	+ <enumerator name='ZPOOL_STATUS_REMOVED_DEV' value='26'/>
	+ <enumerator name='ZPOOL_STATUS_REBUILDING' value='27'/>
	+ <enumerator name='ZPOOL_STATUS_REBUILD_SCRUB' value='28'/>
	+ <enumerator name='ZPOOL_STATUS_NON_NATIVE_ASHIFT' value='29'/>
	+ <enumerator name='ZPOOL_STATUS_COMPATIBILITY_ERR' value='30'/>
	+ <enumerator name='ZPOOL_STATUS_INCOMPATIBLE_FEAT' value='31'/>
	+ <enumerator name='ZPOOL_STATUS_OK' value='32'/>
	+ </enum-decl>
	+ <typedef-decl name='zpool_errata_t' type-id='d9abbf54' id='688c495b'/>
	+ <enum-decl name='zpool_errata' id='d9abbf54'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='ZPOOL_ERRATA_NONE' value='0'/>
	+ <enumerator name='ZPOOL_ERRATA_ZOL_2094_SCRUB' value='1'/>
	+ <enumerator name='ZPOOL_ERRATA_ZOL_2094_ASYNC_DESTROY' value='2'/>
	+ <enumerator name='ZPOOL_ERRATA_ZOL_6845_ENCRYPTION' value='3'/>
	+ <enumerator name='ZPOOL_ERRATA_ZOL_8308_ENCRYPTION' value='4'/>
	+ </enum-decl>
	+ <typedef-decl name='zpool_load_policy_t' type-id='2f65b36f' id='d11b7617'/>
	+ <class-decl name='zpool_load_policy' size-in-bits='256' is-struct='yes' visibility='default' id='2f65b36f'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='zlp_rewind' type-id='8f92235e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='zlp_maxmeta' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='zlp_maxdata' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='zlp_txg' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <qualified-type-def type-id='8e8d4be3' const='yes' id='693c3853'/>
	+ <pointer-type-def type-id='693c3853' size-in-bits='64' id='22cce67b'/>
	+ <pointer-type-def type-id='d6618c78' size-in-bits='64' id='a8425263'/>
	+ <pointer-type-def type-id='a093cbb8' size-in-bits='64' id='b13f38c3'/>
	+ <pointer-type-def type-id='35acf840' size-in-bits='64' id='17f3480d'/>
	+ <pointer-type-def type-id='688c495b' size-in-bits='64' id='cec6f2e4'/>
	+ <pointer-type-def type-id='d11b7617' size-in-bits='64' id='23432aaa'/>
	+ <function-decl name='zpool_props_refresh' mangled-name='zpool_props_refresh' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_props_refresh'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_state_to_name' mangled-name='zpool_state_to_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_state_to_name'>
	+ <parameter type-id='35acf840' name='state'/>
	+ <parameter type-id='9d774e0b' name='aux'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zpool_pool_state_to_name' mangled-name='zpool_pool_state_to_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_pool_state_to_name'>
	+ <parameter type-id='084a08a3' name='state'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_state' mangled-name='zpool_get_state' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_state'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_state_str' mangled-name='zpool_get_state_str' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_state_str'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zpool_expand_proplist' mangled-name='zpool_expand_proplist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_expand_proplist'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='e4378506' name='plp'/>
	+ <parameter type-id='c19b74c3' name='literal'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_is_draid_spare' mangled-name='zpool_is_draid_spare' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_is_draid_spare'>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zpool_destroy' mangled-name='zpool_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_destroy'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='log_str'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_checkpoint' mangled-name='zpool_checkpoint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_checkpoint'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_discard_checkpoint' mangled-name='zpool_discard_checkpoint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_discard_checkpoint'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_add' mangled-name='zpool_add' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_add'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='5ce45b60' name='nvroot'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_export' mangled-name='zpool_export' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_export'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='c19b74c3' name='force'/>
	+ <parameter type-id='80f4b756' name='log_str'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_export_force' mangled-name='zpool_export_force' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_export_force'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='log_str'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_explain_recover' mangled-name='zpool_explain_recover' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_explain_recover'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='95e97e5e' name='reason'/>
	+ <parameter type-id='5ce45b60' name='config'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_print_unsup_feat' mangled-name='zpool_print_unsup_feat' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_print_unsup_feat'>
	+ <parameter type-id='5ce45b60' name='config'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_scan' mangled-name='zpool_scan' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_scan'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='7313fbe2' name='func'/>
	+ <parameter type-id='b51cf3c2' name='cmd'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_find_vdev_by_physpath' mangled-name='zpool_find_vdev_by_physpath' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_find_vdev_by_physpath'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='ppath'/>
	+ <parameter type-id='37e3bd22' name='avail_spare'/>
	+ <parameter type-id='37e3bd22' name='l2cache'/>
	+ <parameter type-id='37e3bd22' name='log'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zpool_find_vdev' mangled-name='zpool_find_vdev' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_find_vdev'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='37e3bd22' name='avail_spare'/>
	+ <parameter type-id='37e3bd22' name='l2cache'/>
	+ <parameter type-id='37e3bd22' name='log'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zpool_trim' mangled-name='zpool_trim' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_trim'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='b1146b8d' name='cmd_type'/>
	+ <parameter type-id='5ce45b60' name='vds'/>
	+ <parameter type-id='b13f38c3' name='trim_flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_initialize' mangled-name='zpool_initialize' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_initialize'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='7063e1ab' name='cmd_type'/>
	+ <parameter type-id='5ce45b60' name='vds'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_initialize_wait' mangled-name='zpool_initialize_wait' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_initialize_wait'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='7063e1ab' name='cmd_type'/>
	+ <parameter type-id='5ce45b60' name='vds'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_physpath' mangled-name='zpool_get_physpath' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_physpath'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='26a90f95' name='physpath'/>
	+ <parameter type-id='b59d7dce' name='phypath_size'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_path_to_guid' mangled-name='zpool_vdev_path_to_guid' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_path_to_guid'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_online' mangled-name='zpool_vdev_online' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_online'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='95e97e5e' name='flags'/>
	+ <parameter type-id='17f3480d' name='newstate'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_offline' mangled-name='zpool_vdev_offline' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_offline'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='c19b74c3' name='istmp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_fault' mangled-name='zpool_vdev_fault' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_fault'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='9c313c2d' name='guid'/>
	+ <parameter type-id='9d774e0b' name='aux'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_degrade' mangled-name='zpool_vdev_degrade' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_degrade'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='9c313c2d' name='guid'/>
	+ <parameter type-id='9d774e0b' name='aux'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_detach' mangled-name='zpool_vdev_detach' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_detach'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_remove' mangled-name='zpool_vdev_remove' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_remove'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_remove_cancel' mangled-name='zpool_vdev_remove_cancel' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_remove_cancel'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_indirect_size' mangled-name='zpool_vdev_indirect_size' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_indirect_size'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='5d6479ae' name='sizep'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_clear' mangled-name='zpool_clear' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_clear'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='5ce45b60' name='rewindnvl'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_clear' mangled-name='zpool_vdev_clear' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_clear'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='9c313c2d' name='guid'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_reguid' mangled-name='zpool_reguid' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_reguid'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_reopen_one' mangled-name='zpool_reopen_one' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_reopen_one'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='eaa32e2f' name='data'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_sync_one' mangled-name='zpool_sync_one' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_sync_one'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='eaa32e2f' name='data'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_name' mangled-name='zpool_vdev_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_name'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='5ce45b60' name='nv'/>
	+ <parameter type-id='95e97e5e' name='name_flags'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_attach' mangled-name='zpool_vdev_attach' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_attach'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='old_disk'/>
	+ <parameter type-id='80f4b756' name='new_disk'/>
	+ <parameter type-id='5ce45b60' name='nvroot'/>
	+ <parameter type-id='95e97e5e' name='replacing'/>
	+ <parameter type-id='c19b74c3' name='rebuild'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_errlog' mangled-name='zpool_get_errlog' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_errlog'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='857bb57e' name='nverrlistp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_upgrade' mangled-name='zpool_upgrade' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_upgrade'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='9c313c2d' name='new_version'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_save_arguments' mangled-name='zfs_save_arguments' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_save_arguments'>
	+ <parameter type-id='95e97e5e' name='argc'/>
	+ <parameter type-id='9b23c9ad' name='argv'/>
	+ <parameter type-id='26a90f95' name='string'/>
	+ <parameter type-id='95e97e5e' name='len'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_log_history' mangled-name='zpool_log_history' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_log_history'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='message'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_history' mangled-name='zpool_get_history' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_history'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='857bb57e' name='nvhisp'/>
	+ <parameter type-id='5d6479ae' name='off'/>
	+ <parameter type-id='37e3bd22' name='eof'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_events_next' mangled-name='zpool_events_next' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_events_next'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='857bb57e' name='nvp'/>
	+ <parameter type-id='7292109c' name='dropped'/>
	+ <parameter type-id='f0981eeb' name='flags'/>
	+ <parameter type-id='95e97e5e' name='zevent_fd'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_events_clear' mangled-name='zpool_events_clear' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_events_clear'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='7292109c' name='count'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_events_seek' mangled-name='zpool_events_seek' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_events_seek'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='9c313c2d' name='eid'/>
	+ <parameter type-id='95e97e5e' name='zevent_fd'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_obj_to_path' mangled-name='zpool_obj_to_path' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_obj_to_path'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='9c313c2d' name='dsobj'/>
	+ <parameter type-id='9c313c2d' name='obj'/>
	+ <parameter type-id='26a90f95' name='pathname'/>
	+ <parameter type-id='b59d7dce' name='len'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_obj_to_path_ds' mangled-name='zpool_obj_to_path_ds' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_obj_to_path_ds'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='9c313c2d' name='dsobj'/>
	+ <parameter type-id='9c313c2d' name='obj'/>
	+ <parameter type-id='26a90f95' name='pathname'/>
	+ <parameter type-id='b59d7dce' name='len'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_wait_status' mangled-name='zpool_wait_status' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_wait_status'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='73446457' name='activity'/>
	+ <parameter type-id='37e3bd22' name='missing'/>
	+ <parameter type-id='37e3bd22' name='waited'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_wait' mangled-name='zpool_wait' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_wait'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='73446457' name='activity'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_set_bootenv' mangled-name='zpool_set_bootenv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_set_bootenv'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='22cce67b' name='envmap'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_bootenv' mangled-name='zpool_get_bootenv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_bootenv'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='857bb57e' name='nvlp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_load_compat' mangled-name='zpool_load_compat' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_load_compat'>
	+ <parameter type-id='80f4b756' name='compat'/>
	+ <parameter type-id='37e3bd22' name='features'/>
	+ <parameter type-id='26a90f95' name='report'/>
	+ <parameter type-id='b59d7dce' name='rlen'/>
	+ <return type-id='901b78d1'/>
	+ </function-decl>
	+ <function-decl name='zpool_set_prop' mangled-name='zpool_set_prop' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_set_prop'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='80f4b756' name='propval'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_create' mangled-name='zpool_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_create'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='5ce45b60' name='nvroot'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='5ce45b60' name='fsprops'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_import_props' mangled-name='zpool_import_props' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_import_props'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='5ce45b60' name='config'/>
	+ <parameter type-id='80f4b756' name='newname'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='95e97e5e' name='flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_import' mangled-name='zpool_import' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_import'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='5ce45b60' name='config'/>
	+ <parameter type-id='80f4b756' name='newname'/>
	+ <parameter type-id='26a90f95' name='altroot'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_vdev_split' mangled-name='zpool_vdev_split' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_vdev_split'>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='26a90f95' name='newname'/>
	+ <parameter type-id='857bb57e' name='newroot'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='325c1e34' name='flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_standard_error_fmt' mangled-name='zpool_standard_error_fmt' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_standard_error_fmt'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='memcmp' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_to_name' mangled-name='zpool_prop_to_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_to_name'>
	+ <parameter type-id='5d0c23fb'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_default_string' mangled-name='zpool_prop_default_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_default_string'>
	+ <parameter type-id='5d0c23fb'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='fnvpair_value_int64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3fa542f0'/>
	+ <return type-id='9da381c4'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_default_numeric' mangled-name='zpool_prop_default_numeric' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_default_numeric'>
	+ <parameter type-id='5d0c23fb'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='zfeature_lookup_name' mangled-name='zfeature_lookup_name' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfeature_lookup_name'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='a8425263'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_feature' mangled-name='zpool_prop_feature' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_feature'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='pool_namecheck' mangled-name='pool_namecheck' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='pool_namecheck'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='053457bd'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_status' mangled-name='zpool_get_status' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_status'>
	+ <parameter type-id='4c81de99'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <parameter type-id='cec6f2e4'/>
	+ <return type-id='d3dd6294'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_get_type' mangled-name='zpool_prop_get_type' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_get_type'>
	+ <parameter type-id='5d0c23fb'/>
	+ <return type-id='31429eff'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_index_to_string' mangled-name='zpool_prop_index_to_string' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_index_to_string'>
	+ <parameter type-id='5d0c23fb'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='7d3cd834'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfeature_is_supported' mangled-name='zfeature_is_supported' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfeature_is_supported'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='strtoull' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='3a47d82b'/>
	+ </function-decl>
	+ <function-decl name='zfs_strcmp_pathname' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_standard_error' mangled-name='zpool_standard_error' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_standard_error'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_pool_checkpoint' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_pool_checkpoint_discard' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_int64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9da381c4'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_uint64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='lzc_wait_tag' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='73446457'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='37e3bd22'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_trim' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b1146b8d'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='c19b74c3'/>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_initialize' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='7063e1ab'/>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_resolve_shortname' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_relabel_disk' mangled-name='zpool_relabel_disk' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_relabel_disk'>
	+ <parameter type-id='b0382bb3'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_load_policy' mangled-name='zpool_get_load_policy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_load_policy'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='23432aaa'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_handle' mangled-name='zpool_get_handle' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_get_handle'>
	+ <parameter type-id='4c81de99'/>
	+ <return type-id='b0382bb3'/>
	+ </function-decl>
	+ <function-decl name='lzc_reopen' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='c19b74c3'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_boolean_value' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='c19b74c3'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='lzc_sync' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='realpath' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='strncasecmp' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_strip_path' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='zfs_strip_partition' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='zfeature_lookup_guid' mangled-name='zfeature_lookup_guid' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfeature_lookup_guid'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='a8425263'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='__xpg_basename' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='zpool_history_unpack' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='9c313c2d'/>
	+ <parameter type-id='5d6479ae'/>
	+ <parameter type-id='75be733c'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_nvlist_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='857bb57e'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_wait' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='73446457'/>
	+ <parameter type-id='37e3bd22'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_set_bootenv' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='22cce67b'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_get_bootenv' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='__strtok_r' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <return type-id='26a90f95'/>
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	+ <function-decl name='munmap' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
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	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='62f7a03d'/>
	+ <return type-id='95e97e5e'/>
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	+ <function-decl name='zpool_name_to_prop' mangled-name='zpool_name_to_prop' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_name_to_prop'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='5d0c23fb'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_readonly' mangled-name='zpool_prop_readonly' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_readonly'>
	+ <parameter type-id='5d0c23fb'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_setonce' mangled-name='zpool_prop_setonce' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_setonce'>
	+ <parameter type-id='5d0c23fb'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='get_system_hostid' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='7359adad'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint8_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='ae3e8ca6'/>
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	+ <abi-instr version='1.0' address-size='64' path='libzfs_sendrecv.c' language='LANG_C89'>
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	- <enumerator name='SPA_FEATURE_DRAID' value='33'/>
	- <enumerator name='SPA_FEATURES' value='34'/>
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	- <var-decl name='avx512' type-id='type-id-313' visibility='default' filepath='../../include/zfs_fletcher.h' line='101' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='256'>
	+ <var-decl name='drr_refguid' type-id='9c313c2d' visibility='default'/>
	</data-member>
	- </union-decl>
	- <class-decl name='zio_cksum' size-in-bits='256' is-struct='yes' visibility='default' filepath='../../include/sys/spa_checksum.h' line='38' column='1' id='type-id-314'>
	+ <data-member access='public' layout-offset-in-bits='320'>
	+ <var-decl name='drr_refobject' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='384'>
	+ <var-decl name='drr_refoffset' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='448'>
	+ <var-decl name='drr_checksumtype' type-id='b96825af' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='456'>
	+ <var-decl name='drr_flags' type-id='b96825af' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='464'>
	+ <var-decl name='drr_pad2' type-id='0f562bd0' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='512'>
	+ <var-decl name='drr_key' type-id='67f6d2cf' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <class-decl name='drr_spill' size-in-bits='640' is-struct='yes' visibility='default' id='1e69a80a'>
	<data-member access='public' layout-offset-in-bits='0'>
	- <var-decl name='zc_word' type-id='type-id-315' visibility='default' filepath='../../include/sys/spa_checksum.h' line='39' column='1'/>
	+ <var-decl name='drr_object' type-id='9c313c2d' visibility='default'/>
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	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='drr_length' type-id='9c313c2d' visibility='default'/>
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	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='drr_toguid' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='drr_flags' type-id='b96825af' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='200'>
	+ <var-decl name='drr_compressiontype' type-id='b96825af' visibility='default'/>
	+ </data-member>
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	+ <var-decl name='drr_pad' type-id='0f562bd0' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='256'>
	+ <var-decl name='drr_compressed_size' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='320'>
	+ <var-decl name='drr_salt' type-id='13339fda' visibility='default'/>
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	+ <data-member access='public' layout-offset-in-bits='384'>
	+ <var-decl name='drr_iv' type-id='fa8ef949' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='480'>
	+ <var-decl name='drr_mac' type-id='fa9986a5' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='608'>
	+ <var-decl name='drr_type' type-id='5c9d8906' visibility='default'/>
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	-
	- <array-type-def dimensions='1' type-id='type-id-27' size-in-bits='256' id='type-id-315'>
	- <subrange length='4' type-id='type-id-48' id='type-id-316'/>
	-
	- </array-type-def>
	- <typedef-decl name='zio_cksum_t' type-id='type-id-314' filepath='../../include/sys/spa_checksum.h' line='40' column='1' id='type-id-309'/>
	- <class-decl name='zfs_fletcher_superscalar' size-in-bits='256' is-struct='yes' visibility='default' filepath='../../include/zfs_fletcher.h' line='69' column='1' id='type-id-317'>
	+ <class-decl name='drr_write_embedded' size-in-bits='384' is-struct='yes' visibility='default' id='98b1345e'>
	<data-member access='public' layout-offset-in-bits='0'>
	- <var-decl name='v' type-id='type-id-315' visibility='default' filepath='../../include/zfs_fletcher.h' line='70' column='1'/>
	+ <var-decl name='drr_object' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='drr_offset' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='drr_length' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='drr_toguid' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='256'>
	+ <var-decl name='drr_compression' type-id='b96825af' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='264'>
	+ <var-decl name='drr_etype' type-id='b96825af' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='272'>
	+ <var-decl name='drr_pad' type-id='0f562bd0' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='320'>
	+ <var-decl name='drr_lsize' type-id='8f92235e' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='352'>
	+ <var-decl name='drr_psize' type-id='8f92235e' visibility='default'/>
	</data-member>
	</class-decl>
	- <typedef-decl name='zfs_fletcher_superscalar_t' type-id='type-id-317' filepath='../../include/zfs_fletcher.h' line='71' column='1' id='type-id-318'/>
	-
	- <array-type-def dimensions='1' type-id='type-id-318' size-in-bits='1024' id='type-id-310'>
	- <subrange length='4' type-id='type-id-48' id='type-id-316'/>
	-
	- </array-type-def>
	- <class-decl name='zfs_fletcher_sse' size-in-bits='128' is-struct='yes' visibility='default' filepath='../../include/zfs_fletcher.h' line='73' column='1' id='type-id-319'>
	+ <class-decl name='drr_object_range' size-in-bits='512' is-struct='yes' visibility='default' id='aba1f9e1'>
	<data-member access='public' layout-offset-in-bits='0'>
	- <var-decl name='v' type-id='type-id-156' visibility='default' filepath='../../include/zfs_fletcher.h' line='74' column='1'/>
	+ <var-decl name='drr_firstobj' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='drr_numslots' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='drr_toguid' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='drr_salt' type-id='13339fda' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='256'>
	+ <var-decl name='drr_iv' type-id='fa8ef949' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='352'>
	+ <var-decl name='drr_mac' type-id='fa9986a5' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='480'>
	+ <var-decl name='drr_flags' type-id='b96825af' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='488'>
	+ <var-decl name='drr_pad' type-id='d3490169' visibility='default'/>
	</data-member>
	</class-decl>
	- <typedef-decl name='zfs_fletcher_sse_t' type-id='type-id-319' filepath='../../include/zfs_fletcher.h' line='75' column='1' id='type-id-320'/>
	-
	- <array-type-def dimensions='1' type-id='type-id-320' size-in-bits='512' id='type-id-311'>
	- <subrange length='4' type-id='type-id-48' id='type-id-316'/>
	-
	- </array-type-def>
	- <class-decl name='zfs_fletcher_avx' size-in-bits='256' is-struct='yes' visibility='default' filepath='../../include/zfs_fletcher.h' line='77' column='1' id='type-id-321'>
	+ <class-decl name='drr_redact' size-in-bits='256' is-struct='yes' visibility='default' id='50389039'>
	<data-member access='public' layout-offset-in-bits='0'>
	- <var-decl name='v' type-id='type-id-315' visibility='default' filepath='../../include/zfs_fletcher.h' line='78' column='1'/>
	+ <var-decl name='drr_object' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='drr_offset' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='drr_length' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='drr_toguid' type-id='9c313c2d' visibility='default'/>
	</data-member>
	</class-decl>
	- <typedef-decl name='zfs_fletcher_avx_t' type-id='type-id-321' filepath='../../include/zfs_fletcher.h' line='79' column='1' id='type-id-322'/>
	-
	- <array-type-def dimensions='1' type-id='type-id-322' size-in-bits='1024' id='type-id-312'>
	- <subrange length='4' type-id='type-id-48' id='type-id-316'/>
	-
	- </array-type-def>
	- <class-decl name='zfs_fletcher_avx512' size-in-bits='512' is-struct='yes' visibility='default' filepath='../../include/zfs_fletcher.h' line='81' column='1' id='type-id-323'>
	+ <class-decl name='drr_checksum' size-in-bits='2432' is-struct='yes' visibility='default' id='a5fe3647'>
	<data-member access='public' layout-offset-in-bits='0'>
	- <var-decl name='v' type-id='type-id-257' visibility='default' filepath='../../include/zfs_fletcher.h' line='82' column='1'/>
	+ <var-decl name='drr_pad' type-id='8c2bcad1' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='2176'>
	+ <var-decl name='drr_checksum' type-id='39730d0b' visibility='default'/>
	</data-member>
	</class-decl>
	- <typedef-decl name='zfs_fletcher_avx512_t' type-id='type-id-323' filepath='../../include/zfs_fletcher.h' line='83' column='1' id='type-id-324'/>
	-
	- <array-type-def dimensions='1' type-id='type-id-324' size-in-bits='2048' id='type-id-313'>
	- <subrange length='4' type-id='type-id-48' id='type-id-316'/>
	-
	- </array-type-def>
	- <typedef-decl name='fletcher_4_ctx_t' type-id='type-id-308' filepath='../../include/zfs_fletcher.h' line='106' column='1' id='type-id-325'/>
	- <pointer-type-def type-id='type-id-325' size-in-bits='64' id='type-id-305'/>
	- <pointer-type-def type-id='type-id-309' size-in-bits='64' id='type-id-306'/>
	- <typedef-decl name='zio_abd_checksum_data_t' type-id='type-id-303' filepath='../../include/sys/zio_checksum.h' line='71' column='1' id='type-id-326'/>
	- <pointer-type-def type-id='type-id-326' size-in-bits='64' id='type-id-327'/>
	- <typedef-decl name='zio_abd_checksum_init_t' type-id='type-id-328' filepath='../../include/sys/zio_checksum.h' line='73' column='1' id='type-id-329'/>
	- <pointer-type-def type-id='type-id-329' size-in-bits='64' id='type-id-300'/>
	- <typedef-decl name='zio_abd_checksum_fini_t' type-id='type-id-328' filepath='../../include/sys/zio_checksum.h' line='74' column='1' id='type-id-330'/>
	- <pointer-type-def type-id='type-id-330' size-in-bits='64' id='type-id-301'/>
	- <typedef-decl name='zio_abd_checksum_iter_t' type-id='type-id-331' filepath='../../include/sys/zio_checksum.h' line='75' column='1' id='type-id-332'/>
	- <pointer-type-def type-id='type-id-332' size-in-bits='64' id='type-id-302'/>
	- <qualified-type-def type-id='type-id-299' const='yes' id='type-id-333'/>
	- <typedef-decl name='zio_abd_checksum_func_t' type-id='type-id-333' filepath='../../include/sys/zio_checksum.h' line='81' column='1' id='type-id-334'/>
	- <var-decl name='fletcher_4_abd_ops' type-id='type-id-334' mangled-name='fletcher_4_abd_ops' visibility='default' filepath='../../include/sys/zio_checksum.h' line='125' column='1' elf-symbol-id='fletcher_4_abd_ops'/>
	- <function-decl name='fletcher_4_incremental_byteswap' mangled-name='fletcher_4_incremental_byteswap' filepath='../../module/zcommon/zfs_fletcher.c' line='589' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_incremental_byteswap'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='589' column='1'/>
	- <parameter type-id='type-id-43' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='589' column='1'/>
	- <parameter type-id='type-id-42' name='data' filepath='../../module/zcommon/zfs_fletcher.c' line='589' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='fletcher_4_native_varsize' mangled-name='fletcher_4_native_varsize' filepath='../../module/zcommon/zfs_fletcher.c' line='488' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_native_varsize'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='488' column='1'/>
	- <parameter type-id='type-id-27' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='488' column='1'/>
	- <parameter type-id='type-id-306' name='zcp' filepath='../../module/zcommon/zfs_fletcher.c' line='488' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='fletcher_4_impl_set' mangled-name='fletcher_4_impl_set' filepath='../../module/zcommon/zfs_fletcher.c' line='369' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_impl_set'>
	- <parameter type-id='type-id-104' name='val' filepath='../../module/zcommon/zfs_fletcher.c' line='369' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='fletcher_2_byteswap' mangled-name='fletcher_2_byteswap' filepath='../../module/zcommon/zfs_fletcher.c' line='297' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_2_byteswap'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='297' column='1'/>
	- <parameter type-id='type-id-27' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='297' column='1'/>
	- <parameter type-id='type-id-42' name='ctx_template' filepath='../../module/zcommon/zfs_fletcher.c' line='298' column='1'/>
	- <parameter type-id='type-id-306' name='zcp' filepath='../../module/zcommon/zfs_fletcher.c' line='298' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='fletcher_2_incremental_byteswap' mangled-name='fletcher_2_incremental_byteswap' filepath='../../module/zcommon/zfs_fletcher.c' line='271' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_2_incremental_byteswap'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='271' column='1'/>
	- <parameter type-id='type-id-43' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='271' column='1'/>
	- <parameter type-id='type-id-42' name='data' filepath='../../module/zcommon/zfs_fletcher.c' line='271' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='fletcher_2_native' mangled-name='fletcher_2_native' filepath='../../module/zcommon/zfs_fletcher.c' line='263' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_2_native'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='297' column='1'/>
	- <parameter type-id='type-id-27' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='297' column='1'/>
	- <parameter type-id='type-id-42' name='ctx_template' filepath='../../module/zcommon/zfs_fletcher.c' line='298' column='1'/>
	- <parameter type-id='type-id-306' name='zcp' filepath='../../module/zcommon/zfs_fletcher.c' line='298' column='1'/>
	- <return type-id='type-id-52'/>
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	- <function-decl name='fletcher_2_incremental_native' mangled-name='fletcher_2_incremental_native' filepath='../../module/zcommon/zfs_fletcher.c' line='237' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_2_incremental_native'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='271' column='1'/>
	- <parameter type-id='type-id-43' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='271' column='1'/>
	- <parameter type-id='type-id-42' name='data' filepath='../../module/zcommon/zfs_fletcher.c' line='271' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='fletcher_init' mangled-name='fletcher_init' filepath='../../module/zcommon/zfs_fletcher.c' line='231' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_init'>
	- <parameter type-id='type-id-306' name='zcp' filepath='../../module/zcommon/zfs_fletcher.c' line='231' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='fletcher_4_native' mangled-name='fletcher_4_native' filepath='../../module/zcommon/zfs_fletcher.c' line='465' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_native'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='465' column='1'/>
	- <parameter type-id='type-id-27' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='465' column='1'/>
	- <parameter type-id='type-id-42' name='ctx_template' filepath='../../module/zcommon/zfs_fletcher.c' line='466' column='1'/>
	- <parameter type-id='type-id-306' name='zcp' filepath='../../module/zcommon/zfs_fletcher.c' line='466' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='fletcher_4_byteswap' mangled-name='fletcher_4_byteswap' filepath='../../module/zcommon/zfs_fletcher.c' line='507' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_byteswap'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='507' column='1'/>
	- <parameter type-id='type-id-27' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='507' column='1'/>
	- <parameter type-id='type-id-42' name='ctx_template' filepath='../../module/zcommon/zfs_fletcher.c' line='508' column='1'/>
	- <parameter type-id='type-id-306' name='zcp' filepath='../../module/zcommon/zfs_fletcher.c' line='508' column='1'/>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='fletcher_4_incremental_native' mangled-name='fletcher_4_incremental_native' filepath='../../module/zcommon/zfs_fletcher.c' line='577' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_incremental_native'>
	- <parameter type-id='type-id-42' name='buf' filepath='../../module/zcommon/zfs_fletcher.c' line='577' column='1'/>
	- <parameter type-id='type-id-43' name='size' filepath='../../module/zcommon/zfs_fletcher.c' line='577' column='1'/>
	- <parameter type-id='type-id-42' name='data' filepath='../../module/zcommon/zfs_fletcher.c' line='577' column='1'/>
	- <return type-id='type-id-6'/>
	- </function-decl>
	- <function-decl name='membar_producer' mangled-name='membar_producer' filepath='../../lib/libspl/include/atomic.h' line='280' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='atomic_swap_32' mangled-name='atomic_swap_32' filepath='../../lib/libspl/include/atomic.h' line='240' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-type size-in-bits='64' id='type-id-331'>
	- <parameter type-id='type-id-42'/>
	- <parameter type-id='type-id-43'/>
	- <parameter type-id='type-id-42'/>
	- <return type-id='type-id-6'/>
	- </function-type>
	- <function-type size-in-bits='64' id='type-id-328'>
	- <parameter type-id='type-id-327'/>
	- <return type-id='type-id-52'/>
	+ <typedef-decl name='Bytef' type-id='efb9ba06' id='c1606520'/>
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	+ <parameter type-id='9200a744' name='zhp'/>
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	+ <parameter type-id='95e97e5e'/>
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	- <underlying-type type-id='type-id-7'/>
	- <enumerator name='PROP_TYPE_NUMBER' value='0'/>
	- <enumerator name='PROP_TYPE_STRING' value='1'/>
	- <enumerator name='PROP_TYPE_INDEX' value='2'/>
	+ <typedef-decl name='zfs_get_column_t' type-id='08f5ca20' id='19cefcee'/>
	+ <enum-decl name='__anonymous_enum__' is-anonymous='yes' id='08f5ca20'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='GET_COL_NONE' value='0'/>
	+ <enumerator name='GET_COL_NAME' value='1'/>
	+ <enumerator name='GET_COL_PROPERTY' value='2'/>
	+ <enumerator name='GET_COL_VALUE' value='3'/>
	+ <enumerator name='GET_COL_RECVD' value='4'/>
	+ <enumerator name='GET_COL_SOURCE' value='5'/>
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	- <parameter type-id='type-id-2' name='prop' filepath='../../module/zcommon/zfs_prop.c' line='842' column='1'/>
	- <return type-id='type-id-355'/>
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	- <parameter type-id='type-id-20' name='types' filepath='../../module/zcommon/zfs_prop.c' line='836' column='1'/>
	- <parameter type-id='type-id-5' name='headcheck' filepath='../../module/zcommon/zfs_prop.c' line='836' column='1'/>
	- <return type-id='type-id-5'/>
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	- <function-decl name='zfs_prop_random_value' mangled-name='zfs_prop_random_value' filepath='../../module/zcommon/zfs_prop.c' line='827' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_random_value'>
	- <parameter type-id='type-id-2' name='prop' filepath='../../module/zcommon/zfs_prop.c' line='827' column='1'/>
	- <parameter type-id='type-id-27' name='seed' filepath='../../module/zcommon/zfs_prop.c' line='827' column='1'/>
	- <return type-id='type-id-27'/>
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	- <pointer-type-def type-id='type-id-104' size-in-bits='64' id='type-id-356'/>
	- <function-decl name='zfs_prop_index_to_string' mangled-name='zfs_prop_index_to_string' filepath='../../module/zcommon/zfs_prop.c' line='821' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_index_to_string'>
	- <parameter type-id='type-id-2' name='prop' filepath='../../module/zcommon/zfs_prop.c' line='821' column='1'/>
	- <parameter type-id='type-id-27' name='index' filepath='../../module/zcommon/zfs_prop.c' line='821' column='1'/>
	- <parameter type-id='type-id-356' name='string' filepath='../../module/zcommon/zfs_prop.c' line='821' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_prop_string_to_index' mangled-name='zfs_prop_string_to_index' filepath='../../module/zcommon/zfs_prop.c' line='815' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_string_to_index'>
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	- <parameter type-id='type-id-104' name='string' filepath='../../module/zcommon/zfs_prop.c' line='815' column='1'/>
	- <parameter type-id='type-id-137' name='index' filepath='../../module/zcommon/zfs_prop.c' line='815' column='1'/>
	- <return type-id='type-id-6'/>
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	- <function-decl name='zfs_prop_written' mangled-name='zfs_prop_written' filepath='../../module/zcommon/zfs_prop.c' line='802' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_written'>
	- <parameter type-id='type-id-104' name='name' filepath='../../module/zcommon/zfs_prop.c' line='802' column='1'/>
	- <return type-id='type-id-5'/>
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	- <function-decl name='zfs_prop_userquota' mangled-name='zfs_prop_userquota' filepath='../../module/zcommon/zfs_prop.c' line='782' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_userquota'>
	- <parameter type-id='type-id-104' name='name' filepath='../../module/zcommon/zfs_prop.c' line='782' column='1'/>
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	+ <typedef-decl name='__int32_t' type-id='95e97e5e' id='33f57a65'/>
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	- <var-decl name='pd_name' type-id='type-id-104' visibility='default' filepath='../../include/zfs_prop.h' line='68' column='1'/>
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	- <var-decl name='pd_strdefault' type-id='type-id-104' visibility='default' filepath='../../include/zfs_prop.h' line='71' column='1'/>
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	- <var-decl name='pd_attr' type-id='type-id-359' visibility='default' filepath='../../include/zfs_prop.h' line='73' column='1'/>
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	- <var-decl name='pd_types' type-id='type-id-6' visibility='default' filepath='../../include/zfs_prop.h' line='74' column='1'/>
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	- <var-decl name='pd_values' type-id='type-id-104' visibility='default' filepath='../../include/zfs_prop.h' line='76' column='1'/>
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	- <var-decl name='pd_colname' type-id='type-id-104' visibility='default' filepath='../../include/zfs_prop.h' line='77' column='1'/>
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	- <var-decl name='pd_visible' type-id='type-id-5' visibility='default' filepath='../../include/zfs_prop.h' line='79' column='1'/>
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	- <var-decl name='pd_zfs_mod_supported' type-id='type-id-5' visibility='default' filepath='../../include/zfs_prop.h' line='81' column='1'/>
	+ <var-decl name='pd_zfs_mod_supported' type-id='c19b74c3' visibility='default'/>
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	- <var-decl name='pd_table' type-id='type-id-360' visibility='default' filepath='../../include/zfs_prop.h' line='82' column='1'/>
	+ <var-decl name='pd_table' type-id='c8bc397b' visibility='default'/>
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	- <var-decl name='pd_table_size' type-id='type-id-43' visibility='default' filepath='../../include/zfs_prop.h' line='84' column='1'/>
	+ <var-decl name='pd_table_size' type-id='b59d7dce' visibility='default'/>
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	- <underlying-type type-id='type-id-7'/>
	+ <typedef-decl name='zprop_attr_t' type-id='40ed39d4' id='999701cc'/>
	+ <enum-decl name='__anonymous_enum__1' is-anonymous='yes' id='40ed39d4'>
	+ <underlying-type type-id='9cac1fee'/>
	<enumerator name='PROP_DEFAULT' value='0'/>
	<enumerator name='PROP_READONLY' value='1'/>
	<enumerator name='PROP_INHERIT' value='2'/>
	<enumerator name='PROP_ONETIME' value='3'/>
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	- <class-decl name='zfs_index' size-in-bits='128' is-struct='yes' visibility='default' filepath='../../include/zfs_prop.h' line='62' column='1' id='type-id-362'>
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	- <var-decl name='pi_name' type-id='type-id-104' visibility='default' filepath='../../include/zfs_prop.h' line='63' column='1'/>
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	- <var-decl name='pi_value' type-id='type-id-27' visibility='default' filepath='../../include/zfs_prop.h' line='64' column='1'/>
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	- <pointer-type-def type-id='type-id-357' size-in-bits='64' id='type-id-365'/>
	- <function-decl name='zfs_prop_get_table' mangled-name='zfs_prop_get_table' filepath='../../module/zcommon/zfs_prop.c' line='69' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_table'>
	- <return type-id='type-id-365'/>
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	- <function-decl name='zprop_random_value' mangled-name='zprop_random_value' filepath='../../include/zfs_prop.h' line='124' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zprop_index_to_string' mangled-name='zprop_index_to_string' filepath='../../include/zfs_prop.h' line='123' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zprop_register_index' mangled-name='zprop_register_index' filepath='../../include/zfs_prop.h' line='112' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zprop_register_string' mangled-name='zprop_register_string' filepath='../../include/zfs_prop.h' line='108' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zprop_register_number' mangled-name='zprop_register_number' filepath='../../include/zfs_prop.h' line='110' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zprop_register_hidden' mangled-name='zprop_register_hidden' filepath='../../include/zfs_prop.h' line='114' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
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	- <function-decl name='zprop_register_impl' mangled-name='zprop_register_impl' filepath='../../include/zfs_prop.h' line='105' column='1' visibility='default' binding='global' size-in-bits='64'>
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	- <function-decl name='zpool_prop_column_name' mangled-name='zpool_prop_column_name' filepath='../../module/zcommon/zpool_prop.c' line='251' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_column_name'>
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	- <return type-id='type-id-365'/>
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	+ <return type-id='95e97e5e'/>
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	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='libzfs_run_process' mangled-name='libzfs_run_process' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_run_process'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='9b23c9ad' name='argv'/>
	+ <parameter type-id='95e97e5e' name='flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libzfs_run_process_get_stdout' mangled-name='libzfs_run_process_get_stdout' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_run_process_get_stdout'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='9b23c9ad' name='argv'/>
	+ <parameter type-id='9b23c9ad' name='env'/>
	+ <parameter type-id='c0563f85' name='lines'/>
	+ <parameter type-id='7292109c' name='lines_cnt'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libzfs_run_process_get_stdout_nopath' mangled-name='libzfs_run_process_get_stdout_nopath' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_run_process_get_stdout_nopath'>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='9b23c9ad' name='argv'/>
	+ <parameter type-id='9b23c9ad' name='env'/>
	+ <parameter type-id='c0563f85' name='lines'/>
	+ <parameter type-id='7292109c' name='lines_cnt'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libzfs_free_str_array' mangled-name='libzfs_free_str_array' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_free_str_array'>
	+ <parameter type-id='9b23c9ad' name='strs'/>
	+ <parameter type-id='95e97e5e' name='count'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='libzfs_envvar_is_set' mangled-name='libzfs_envvar_is_set' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_envvar_is_set'>
	+ <parameter type-id='26a90f95' name='envvar'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libzfs_fini' mangled-name='libzfs_fini' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_fini'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_path_to_zhandle' mangled-name='zfs_path_to_zhandle' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_path_to_zhandle'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='80f4b756' name='path'/>
	+ <parameter type-id='2e45de5d' name='argtype'/>
	+ <return type-id='9200a744'/>
	+ </function-decl>
	+ <function-decl name='zprop_print_one_property' mangled-name='zprop_print_one_property' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_print_one_property'>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <parameter type-id='0d2a0670' name='cbp'/>
	+ <parameter type-id='80f4b756' name='propname'/>
	+ <parameter type-id='80f4b756' name='value'/>
	+ <parameter type-id='a2256d42' name='sourcetype'/>
	+ <parameter type-id='80f4b756' name='source'/>
	+ <parameter type-id='80f4b756' name='recvd_value'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='libzfs_init' mangled-name='libzfs_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_init'>
	+ <return type-id='b0382bb3'/>
	+ </function-decl>
	+ <function-decl name='zprop_get_list' mangled-name='zprop_get_list' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_get_list'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='26a90f95' name='props'/>
	+ <parameter type-id='e4378506' name='listp'/>
	+ <parameter type-id='2e45de5d' name='type'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zprop_free_list' mangled-name='zprop_free_list' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_free_list'>
	+ <parameter type-id='3a9b2288' name='pl'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zprop_iter' mangled-name='zprop_iter' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_iter'>
	+ <parameter type-id='1ec3747a' name='func'/>
	+ <parameter type-id='eaa32e2f' name='cb'/>
	+ <parameter type-id='c19b74c3' name='show_all'/>
	+ <parameter type-id='c19b74c3' name='ordered'/>
	+ <parameter type-id='2e45de5d' name='type'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_version_userland' mangled-name='zfs_version_userland' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_version_userland'>
	+ <parameter type-id='26a90f95' name='version'/>
	+ <parameter type-id='95e97e5e' name='len'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_version_print' mangled-name='zfs_version_print' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_version_print'>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='color_start' mangled-name='color_start' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='color_start'>
	+ <parameter type-id='26a90f95' name='color'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='color_end' mangled-name='color_end' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='color_end'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='printf_color' mangled-name='printf_color' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='printf_color'>
	+ <parameter type-id='26a90f95' name='color'/>
	+ <parameter type-id='26a90f95' name='format'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='realloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='waitpid' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3629bad8'/>
	+ <parameter type-id='7292109c'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='3629bad8'/>
	+ </function-decl>
	+ <function-decl name='vfork' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='3629bad8'/>
	+ </function-decl>
	+ <function-decl name='execve' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='f319fae0'/>
	+ <parameter type-id='f319fae0'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='_exit' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='dup2' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='execvpe' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='f319fae0'/>
	+ <parameter type-id='f319fae0'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='execv' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='f319fae0'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='execvp' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='f319fae0'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='vsnprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b7f2d5e6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='exit' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='__ctype_toupper_loc' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='24f95ba5'/>
	+ </function-decl>
	+ <function-decl name='zprop_width' mangled-name='zprop_width' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_width'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='37e3bd22'/>
	+ <parameter type-id='2e45de5d'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='vasprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9b23c9ad'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b7f2d5e6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zprop_name_to_prop' mangled-name='zprop_name_to_prop' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_name_to_prop'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='2e45de5d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zprop_valid_for_type' mangled-name='zprop_valid_for_type' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_valid_for_type'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='2e45de5d'/>
	+ <parameter type-id='c19b74c3'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_unsupported' mangled-name='zpool_prop_unsupported' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_unsupported'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='strnlen' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='libzfs_core_fini' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='regfree' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='d33f11cb'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fletcher_4_fini' mangled-name='fletcher_4_fini' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_fini'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='getextmntent' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='394fc496'/>
	+ <parameter type-id='62f7a03d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='strtod' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <return type-id='a0eb0f08'/>
	+ </function-decl>
	+ <function-decl name='pow' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a0eb0f08'/>
	+ <parameter type-id='a0eb0f08'/>
	+ <return type-id='a0eb0f08'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_get_table' mangled-name='zpool_prop_get_table' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_get_table'>
	+ <return type-id='76c8174b'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_get_table' mangled-name='zfs_prop_get_table' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_get_table'>
	+ <return type-id='76c8174b'/>
	+ </function-decl>
	+ <function-decl name='libzfs_load_module' mangled-name='libzfs_load_module' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_load_module'>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='regcomp' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='d33f11cb'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libzfs_core_init' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_prop_init' mangled-name='zfs_prop_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_prop_init'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_prop_init' mangled-name='zpool_prop_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_prop_init'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_feature_init' mangled-name='zpool_feature_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_feature_init'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fletcher_4_init' mangled-name='fletcher_4_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='fletcher_4_init'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zprop_string_to_index' mangled-name='zprop_string_to_index' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_string_to_index'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5d6479ae'/>
	+ <parameter type-id='2e45de5d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zprop_values' mangled-name='zprop_values' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_values'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='2e45de5d'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='zprop_iter_common' mangled-name='zprop_iter_common' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_iter_common'>
	+ <parameter type-id='1ec3747a'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='c19b74c3'/>
	+ <parameter type-id='c19b74c3'/>
	+ <parameter type-id='2e45de5d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_version_kernel' mangled-name='zfs_version_kernel' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_version_kernel'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='vfprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b7f2d5e6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-type size-in-bits='64' id='c70fa2e8'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='eaa32e2f'/>
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	+ </function-type>
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	- <abi-instr version='1.0' address-size='64' path='../../module/zcommon/zprop_common.c' comp-dir-path='/home/colm/src/zfs/zfs/lib/libzfs' language='LANG_C99'>
	- <function-decl name='zprop_width' mangled-name='zprop_width' filepath='../../module/zcommon/zprop_common.c' line='401' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_width'>
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	- <function-decl name='zprop_name_to_prop' mangled-name='zprop_name_to_prop' filepath='../../module/zcommon/zprop_common.c' line='274' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_name_to_prop'>
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	- <var-decl name='shareopts' type-id='type-id-23' visibility='default' filepath='/home/colm/src/zfs/zfs/lib/libshare/libshare_impl.h' line='29' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='80'>
	+ <var-decl name='node_addr' type-id='0f562bd0' visibility='default'/>
	</data-member>
	</class-decl>
	- <typedef-decl name='sa_share_fsinfo_t' type-id='type-id-378' filepath='/home/colm/src/zfs/zfs/lib/libshare/libshare_impl.h' line='30' column='1' id='type-id-379'/>
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	- <typedef-decl name='sa_share_ops_t' type-id='type-id-369' filepath='/home/colm/src/zfs/zfs/lib/libshare/libshare_impl.h' line='51' column='1' id='type-id-388'/>
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	- <parameter type-id='type-id-368' name='ops' filepath='/home/colm/src/zfs/zfs/lib/libshare/libshare.c' line='51' column='1'/>
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	- <abi-instr version='1.0' address-size='64' path='os/linux/nfs.c' comp-dir-path='/home/colm/src/zfs/zfs/lib/libshare' language='LANG_C99'>
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	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='unlink' mangled-name='unlink' filepath='/usr/include/unistd.h' line='825' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
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	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='mkstemp' mangled-name='mkstemp64' filepath='/usr/include/stdlib.h' line='688' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='mkdir' mangled-name='mkdir' filepath='/usr/include/x86_64-linux-gnu/sys/stat.h' line='317' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='__builtin_stpcpy' mangled-name='stpcpy' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='flock' mangled-name='flock' filepath='/usr/include/x86_64-linux-gnu/sys/file.h' line='51' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='rename' mangled-name='rename' filepath='/usr/include/stdio.h' line='148' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- </abi-instr>
	- <abi-instr version='1.0' address-size='64' path='os/linux/smb.c' comp-dir-path='/home/colm/src/zfs/zfs/lib/libshare' language='LANG_C99'>
	- <class-decl name='smb_share_s' size-in-bits='36992' is-struct='yes' visibility='default' filepath='./smb.h' line='38' column='1' id='type-id-392'>
	+ <typedef-decl name='uint16_t' type-id='8efea9e5' id='149c6638'/>
	+ <class-decl name='dk_part' size-in-bits='960' is-struct='yes' visibility='default' id='a65ae39c'>
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	- <var-decl name='name' type-id='type-id-393' visibility='default' filepath='./smb.h' line='39' column='1'/>
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	</data-member>
	- <data-member access='public' layout-offset-in-bits='2040'>
	- <var-decl name='path' type-id='type-id-143' visibility='default' filepath='./smb.h' line='40' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='p_size' type-id='804dc465' visibility='default'/>
	</data-member>
	- <data-member access='public' layout-offset-in-bits='34808'>
	- <var-decl name='comment' type-id='type-id-393' visibility='default' filepath='./smb.h' line='41' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='p_guid' type-id='214f32ea' visibility='default'/>
	</data-member>
	- <data-member access='public' layout-offset-in-bits='36864'>
	- <var-decl name='guest_ok' type-id='type-id-5' visibility='default' filepath='./smb.h' line='42' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='256'>
	+ <var-decl name='p_tag' type-id='d908a348' visibility='default'/>
	</data-member>
	- <data-member access='public' layout-offset-in-bits='36928'>
	- <var-decl name='next' type-id='type-id-394' visibility='default' filepath='./smb.h' line='44' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='272'>
	+ <var-decl name='p_flag' type-id='d908a348' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='288'>
	+ <var-decl name='p_name' type-id='16e6f2c6' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='576'>
	+ <var-decl name='p_uguid' type-id='214f32ea' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='704'>
	+ <var-decl name='p_resv' type-id='01d84ed4' visibility='default'/>
	</data-member>
	</class-decl>
	-
	- <array-type-def dimensions='1' type-id='type-id-45' size-in-bits='2040' id='type-id-393'>
	- <subrange length='255' type-id='type-id-48' id='type-id-395'/>
	-
	- </array-type-def>
	- <pointer-type-def type-id='type-id-392' size-in-bits='64' id='type-id-394'/>
	- <typedef-decl name='smb_share_t' type-id='type-id-392' filepath='./smb.h' line='45' column='1' id='type-id-396'/>
	- <pointer-type-def type-id='type-id-396' size-in-bits='64' id='type-id-397'/>
	- <var-decl name='smb_shares' type-id='type-id-397' mangled-name='smb_shares' visibility='default' filepath='./smb.h' line='47' column='1' elf-symbol-id='smb_shares'/>
	- <function-decl name='opendir' mangled-name='opendir' filepath='/usr/include/dirent.h' line='134' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	- </function-decl>
	- <function-decl name='fgets' mangled-name='fgets' filepath='/usr/include/stdio.h' line='570' column='1' visibility='default' binding='global' size-in-bits='64'>
	- <return type-id='type-id-52'/>
	+ <typedef-decl name='ushort_t' type-id='8efea9e5' id='d908a348'/>
	+ <pointer-type-def type-id='dd4a2e5a' size-in-bits='64' id='0d8119a8'/>
	+ <pointer-type-def type-id='0d8119a8' size-in-bits='64' id='c43b27a6'/>
	+ <function-decl name='zpool_label_disk' mangled-name='zpool_label_disk' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_label_disk'>
	+ <parameter type-id='b0382bb3' name='hdl'/>
	+ <parameter type-id='4c81de99' name='zhp'/>
	+ <parameter type-id='80f4b756' name='name'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='efi_alloc_and_read' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='c43b27a6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='efi_free' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='0d8119a8'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='efi_use_whole_disk' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fsync' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='rand' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='efi_alloc_and_init' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='8f92235e'/>
	+ <parameter type-id='c43b27a6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='efi_write' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='0d8119a8'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='efi_rescan' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zfs_append_partition' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_label_disk_wait' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='os/linux/libzfs_sendrecv_os.c' language='LANG_C89'>
	+ <function-decl name='fscanf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fcntl' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='os/linux/libzfs_util_os.c' language='LANG_C89'>
	+ <typedef-decl name='clockid_t' type-id='08f9a87a' id='a1c3b834'/>
	+ <typedef-decl name='__clockid_t' type-id='95e97e5e' id='08f9a87a'/>
	+ <typedef-decl name='__useconds_t' type-id='f0981eeb' id='4e80d4b1'/>
	+ <pointer-type-def type-id='a9c79a1f' size-in-bits='64' id='3d83ba87'/>
	+ <function-decl name='libzfs_error_init' mangled-name='libzfs_error_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libzfs_error_init'>
	+ <parameter type-id='95e97e5e' name='error'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='access' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='clock_gettime' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a1c3b834'/>
	+ <parameter type-id='3d83ba87'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='sched_yield' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='usleep' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='4e80d4b1'/>
	+ <return type-id='95e97e5e'/>
	</function-decl>
	</abi-instr>
	</abi-corpus>
	diff --git a/sys/contrib/openzfs/lib/libzfs/libzfs_crypto.c b/sys/contrib/openzfs/lib/libzfs/libzfs_crypto.c
	index 5fb93d265965..e31d4ce44bfb 100644
	--- a/sys/contrib/openzfs/lib/libzfs/libzfs_crypto.c
	+++ b/sys/contrib/openzfs/lib/libzfs/libzfs_crypto.c
	@@ -1,1619 +1,1619 @@
	/*
	* CDDL HEADER START
	*
	* This file and its contents are supplied under the terms of the
	* Common Development and Distribution License ("CDDL"), version 1.0.
	* You may only use this file in accordance with the terms of version
	* 1.0 of the CDDL.
	*
	* A full copy of the text of the CDDL should have accompanied this
	* source. A copy of the CDDL is also available via the Internet at
	* http://www.illumos.org/license/CDDL.
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2017, Datto, Inc. All rights reserved.
	* Copyright 2020 Joyent, Inc.
	*/

	#include <sys/zfs_context.h>
	#include <sys/fs/zfs.h>
	#include <sys/dsl_crypt.h>
	#include <libintl.h>
	#include <termios.h>
	#include <signal.h>
	#include <errno.h>
	#include <openssl/evp.h>
	#include <libzfs.h>
	#include "libzfs_impl.h"
	#include "zfeature_common.h"

	/*
	* User keys are used to decrypt the master encryption keys of a dataset. This
	* indirection allows a user to change his / her access key without having to
	* re-encrypt the entire dataset. User keys can be provided in one of several
	* ways. Raw keys are simply given to the kernel as is. Similarly, hex keys
	* are converted to binary and passed into the kernel. Password based keys are
	* a bit more complicated. Passwords alone do not provide suitable entropy for
	* encryption and may be too short or too long to be used. In order to derive
	* a more appropriate key we use a PBKDF2 function. This function is designed
	* to take a (relatively) long time to calculate in order to discourage
	* attackers from guessing from a list of common passwords. PBKDF2 requires
	* 2 additional parameters. The first is the number of iterations to run, which
	* will ultimately determine how long it takes to derive the resulting key from
	* the password. The second parameter is a salt that is randomly generated for
	* each dataset. The salt is used to "tweak" PBKDF2 such that a group of
	* attackers cannot reasonably generate a table of commonly known passwords to
	* their output keys and expect it work for all past and future PBKDF2 users.
	* We store the salt as a hidden property of the dataset (although it is
	* technically ok if the salt is known to the attacker).
	*/

	#define MIN_PASSPHRASE_LEN 8
	#define MAX_PASSPHRASE_LEN 512
	#define MAX_KEY_PROMPT_ATTEMPTS 3

	static int caught_interrupt;

	static int get_key_material_file(libzfs_handle_t , const char , const char *,
	zfs_keyformat_t, boolean_t, uint8_t *, size_t );

	static zfs_uri_handler_t uri_handlers[] = {
	{ "file", get_key_material_file },
	{ NULL, NULL }
	};

	static int
	pkcs11_get_urandom(uint8_t *buf, size_t bytes)
	{
	int rand;
	ssize_t bytes_read = 0;

	rand = open("/dev/urandom", O_RDONLY \| O_CLOEXEC);

	if (rand < 0)
	return (rand);

	while (bytes_read < bytes) {
	ssize_t rc = read(rand, buf + bytes_read, bytes - bytes_read);
	if (rc < 0)
	break;
	bytes_read += rc;
	}

	(void) close(rand);

	return (bytes_read);
	}

	static int
	zfs_prop_parse_keylocation(libzfs_handle_t restrict hdl, const char str,
	zfs_keylocation_t restrict locp, char *restrict schemep)
	{
	*locp = ZFS_KEYLOCATION_NONE;
	*schemep = NULL;

	if (strcmp("prompt", str) == 0) {
	*locp = ZFS_KEYLOCATION_PROMPT;
	return (0);
	}

	regmatch_t pmatch[2];

	if (regexec(&hdl->libzfs_urire, str, ARRAY_SIZE(pmatch),
	pmatch, 0) == 0) {
	size_t scheme_len;

	if (pmatch[1].rm_so == -1) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Invalid URI"));
	return (EINVAL);
	}

	scheme_len = pmatch[1].rm_eo - pmatch[1].rm_so;

	*schemep = calloc(1, scheme_len + 1);
	if (*schemep == NULL) {
	int ret = errno;

	errno = 0;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Invalid URI"));
	return (ret);
	}

	(void) memcpy(*schemep, str + pmatch[1].rm_so, scheme_len);
	*locp = ZFS_KEYLOCATION_URI;
	return (0);
	}

	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "Invalid keylocation"));
	return (EINVAL);
	}

	static int
	hex_key_to_raw(char hex, int hexlen, uint8_t out)
	{
	int ret, i;
	unsigned int c;

	for (i = 0; i < hexlen; i += 2) {
	if (!isxdigit(hex[i]) \|\| !isxdigit(hex[i + 1])) {
	ret = EINVAL;
	goto error;
	}

	ret = sscanf(&hex[i], "%02x", &c);
	if (ret != 1) {
	ret = EINVAL;
	goto error;
	}

	out[i / 2] = c;
	}

	return (0);

	error:
	return (ret);
	}


	static void
	catch_signal(int sig)
	{
	caught_interrupt = sig;
	}

	static const char *
	get_format_prompt_string(zfs_keyformat_t format)
	{
	switch (format) {
	case ZFS_KEYFORMAT_RAW:
	return ("raw key");
	case ZFS_KEYFORMAT_HEX:
	return ("hex key");
	case ZFS_KEYFORMAT_PASSPHRASE:
	return ("passphrase");
	default:
	/* shouldn't happen */
	return (NULL);
	}
	}

	/* do basic validation of the key material */
	static int
	validate_key(libzfs_handle_t *hdl, zfs_keyformat_t keyformat,
	const char *key, size_t keylen)
	{
	switch (keyformat) {
	case ZFS_KEYFORMAT_RAW:
	/* verify the key length is correct */
	if (keylen < WRAPPING_KEY_LEN) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Raw key too short (expected %u)."),
	WRAPPING_KEY_LEN);
	return (EINVAL);
	}

	if (keylen > WRAPPING_KEY_LEN) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Raw key too long (expected %u)."),
	WRAPPING_KEY_LEN);
	return (EINVAL);
	}
	break;
	case ZFS_KEYFORMAT_HEX:
	/* verify the key length is correct */
	if (keylen < WRAPPING_KEY_LEN * 2) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Hex key too short (expected %u)."),
	WRAPPING_KEY_LEN * 2);
	return (EINVAL);
	}

	if (keylen > WRAPPING_KEY_LEN * 2) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Hex key too long (expected %u)."),
	WRAPPING_KEY_LEN * 2);
	return (EINVAL);
	}

	/* check for invalid hex digits */
	for (size_t i = 0; i < WRAPPING_KEY_LEN * 2; i++) {
	if (!isxdigit(key[i])) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Invalid hex character detected."));
	return (EINVAL);
	}
	}
	break;
	case ZFS_KEYFORMAT_PASSPHRASE:
	/* verify the length is within bounds */
	if (keylen > MAX_PASSPHRASE_LEN) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Passphrase too long (max %u)."),
	MAX_PASSPHRASE_LEN);
	return (EINVAL);
	}

	if (keylen < MIN_PASSPHRASE_LEN) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Passphrase too short (min %u)."),
	MIN_PASSPHRASE_LEN);
	return (EINVAL);
	}
	break;
	default:
	/* can't happen, checked above */
	break;
	}

	return (0);
	}

	static int
	libzfs_getpassphrase(zfs_keyformat_t keyformat, boolean_t is_reenter,
	boolean_t new_key, const char *fsname,
	char *restrict res, size_t restrict reslen)
	{
	FILE *f = stdin;
	size_t buflen = 0;
	ssize_t bytes;
	int ret = 0;
	struct termios old_term, new_term;
	struct sigaction act, osigint, osigtstp;

	*res = NULL;
	*reslen = 0;

	/*
	* handle SIGINT and ignore SIGSTP. This is necessary to
	* restore the state of the terminal.
	*/
	caught_interrupt = 0;
	act.sa_flags = 0;
	(void) sigemptyset(&act.sa_mask);
	act.sa_handler = catch_signal;

	(void) sigaction(SIGINT, &act, &osigint);
	act.sa_handler = SIG_IGN;
	(void) sigaction(SIGTSTP, &act, &osigtstp);

	(void) printf("%s %s%s",
	is_reenter ? "Re-enter" : "Enter",
	new_key ? "new " : "",
	get_format_prompt_string(keyformat));
	if (fsname != NULL)
	(void) printf(" for '%s'", fsname);
	(void) fputc(':', stdout);
	(void) fflush(stdout);

	/* disable the terminal echo for key input */
	(void) tcgetattr(fileno(f), &old_term);

	new_term = old_term;
	new_term.c_lflag &= ~(ECHO \| ECHOE \| ECHOK \| ECHONL);

	ret = tcsetattr(fileno(f), TCSAFLUSH, &new_term);
	if (ret != 0) {
	ret = errno;
	errno = 0;
	goto out;
	}

	bytes = getline(res, &buflen, f);
	if (bytes < 0) {
	ret = errno;
	errno = 0;
	goto out;
	}

	/* trim the ending newline if it exists */
	if (bytes > 0 && (*res)[bytes - 1] == '\n') {
	(*res)[bytes - 1] = '\0';
	bytes--;
	}

	*reslen = bytes;

	out:
	/* reset the terminal */
	(void) tcsetattr(fileno(f), TCSAFLUSH, &old_term);
	(void) sigaction(SIGINT, &osigint, NULL);
	(void) sigaction(SIGTSTP, &osigtstp, NULL);

	/* if we caught a signal, re-throw it now */
	if (caught_interrupt != 0)
	(void) kill(getpid(), caught_interrupt);

	/* print the newline that was not echo'd */
	(void) printf("\n");

	return (ret);
	}

	static int
	get_key_interactive(libzfs_handle_t restrict hdl, const char fsname,
	zfs_keyformat_t keyformat, boolean_t confirm_key, boolean_t newkey,
	uint8_t *restrict outbuf, size_t restrict len_out)
	{
	char buf = NULL, buf2 = NULL;
	size_t buflen = 0, buf2len = 0;
	int ret = 0;

	ASSERT(isatty(fileno(stdin)));

	/* raw keys cannot be entered on the terminal */
	if (keyformat == ZFS_KEYFORMAT_RAW) {
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Cannot enter raw keys on the terminal"));
	goto out;
	}

	/* prompt for the key */
	if ((ret = libzfs_getpassphrase(keyformat, B_FALSE, newkey, fsname,
	&buf, &buflen)) != 0) {
	free(buf);
	buf = NULL;
	buflen = 0;
	goto out;
	}

	if (!confirm_key)
	goto out;

	if ((ret = validate_key(hdl, keyformat, buf, buflen)) != 0) {
	free(buf);
	return (ret);
	}

	ret = libzfs_getpassphrase(keyformat, B_TRUE, newkey, fsname, &buf2,
	&buf2len);
	if (ret != 0) {
	free(buf);
	free(buf2);
	buf = buf2 = NULL;
	buflen = buf2len = 0;
	goto out;
	}

	if (buflen != buf2len \|\| strcmp(buf, buf2) != 0) {
	free(buf);
	buf = NULL;
	buflen = 0;

	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Provided keys do not match."));
	}

	free(buf2);

	out:
	outbuf = (uint8_t )buf;
	*len_out = buflen;
	return (ret);
	}

	static int
	get_key_material_raw(FILE *fd, zfs_keyformat_t keyformat,
	uint8_t *buf, size_t len_out)
	{
	int ret = 0;
	size_t buflen = 0;

	*len_out = 0;

	/* read the key material */
	if (keyformat != ZFS_KEYFORMAT_RAW) {
	ssize_t bytes;

	bytes = getline((char **)buf, &buflen, fd);
	if (bytes < 0) {
	ret = errno;
	errno = 0;
	goto out;
	}

	/* trim the ending newline if it exists */
	if (bytes > 0 && (*buf)[bytes - 1] == '\n') {
	(*buf)[bytes - 1] = '\0';
	bytes--;
	}

	*len_out = bytes;
	} else {
	size_t n;

	/*
	* Raw keys may have newline characters in them and so can't
	* use getline(). Here we attempt to read 33 bytes so that we
	* can properly check the key length (the file should only have
	* 32 bytes).
	*/
	buf = malloc((WRAPPING_KEY_LEN + 1) sizeof (uint8_t));
	if (*buf == NULL) {
	ret = ENOMEM;
	goto out;
	}

	n = fread(*buf, 1, WRAPPING_KEY_LEN + 1, fd);
	if (n == 0 \|\| ferror(fd)) {
	/* size errors are handled by the calling function */
	free(*buf);
	*buf = NULL;
	ret = errno;
	errno = 0;
	goto out;
	}

	*len_out = n;
	}
	out:
	return (ret);
	}

	static int
	get_key_material_file(libzfs_handle_t hdl, const char uri,
	const char *fsname, zfs_keyformat_t keyformat, boolean_t newkey,
	uint8_t *restrict buf, size_t restrict len_out)
	{
	FILE *f = NULL;
	int ret = 0;

	if (strlen(uri) < 7)
	return (EINVAL);

	if ((f = fopen(uri + 7, "re")) == NULL) {
	ret = errno;
	errno = 0;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	- "Failed to open key material file"));
	+ "Failed to open key material file: %s"), strerror(ret));
	return (ret);
	}

	ret = get_key_material_raw(f, keyformat, buf, len_out);

	(void) fclose(f);

	return (ret);
	}

	/*
	* Attempts to fetch key material, no matter where it might live. The key
	* material is allocated and returned in km_out. *can_retry_out will be set
	* to B_TRUE if the user is providing the key material interactively, allowing
	* for re-entry attempts.
	*/
	static int
	get_key_material(libzfs_handle_t *hdl, boolean_t do_verify, boolean_t newkey,
	zfs_keyformat_t keyformat, char keylocation, const char fsname,
	uint8_t *km_out, size_t kmlen_out, boolean_t *can_retry_out)
	{
	int ret;
	zfs_keylocation_t keyloc = ZFS_KEYLOCATION_NONE;
	uint8_t *km = NULL;
	size_t kmlen = 0;
	char *uri_scheme = NULL;
	zfs_uri_handler_t *handler = NULL;
	boolean_t can_retry = B_FALSE;

	/* verify and parse the keylocation */
	ret = zfs_prop_parse_keylocation(hdl, keylocation, &keyloc,
	&uri_scheme);
	if (ret != 0)
	goto error;

	/* open the appropriate file descriptor */
	switch (keyloc) {
	case ZFS_KEYLOCATION_PROMPT:
	if (isatty(fileno(stdin))) {
	can_retry = keyformat != ZFS_KEYFORMAT_RAW;
	ret = get_key_interactive(hdl, fsname, keyformat,
	do_verify, newkey, &km, &kmlen);
	} else {
	/* fetch the key material into the buffer */
	ret = get_key_material_raw(stdin, keyformat, &km,
	&kmlen);
	}

	if (ret != 0)
	goto error;

	break;
	case ZFS_KEYLOCATION_URI:
	ret = ENOTSUP;

	for (handler = uri_handlers; handler->zuh_scheme != NULL;
	handler++) {
	if (strcmp(handler->zuh_scheme, uri_scheme) != 0)
	continue;

	if ((ret = handler->zuh_handler(hdl, keylocation,
	fsname, keyformat, newkey, &km, &kmlen)) != 0)
	goto error;

	break;
	}

	if (ret == ENOTSUP) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"URI scheme is not supported"));
	goto error;
	}

	break;
	default:
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Invalid keylocation."));
	goto error;
	}

	if ((ret = validate_key(hdl, keyformat, (const char *)km, kmlen)) != 0)
	goto error;

	*km_out = km;
	*kmlen_out = kmlen;
	if (can_retry_out != NULL)
	*can_retry_out = can_retry;

	free(uri_scheme);
	return (0);

	error:
	free(km);

	*km_out = NULL;
	*kmlen_out = 0;

	if (can_retry_out != NULL)
	*can_retry_out = can_retry;

	free(uri_scheme);
	return (ret);
	}

	static int
	derive_key(libzfs_handle_t *hdl, zfs_keyformat_t format, uint64_t iters,
	uint8_t *key_material, size_t key_material_len, uint64_t salt,
	uint8_t **key_out)
	{
	int ret;
	uint8_t *key;

	*key_out = NULL;

	key = zfs_alloc(hdl, WRAPPING_KEY_LEN);
	if (!key)
	return (ENOMEM);

	switch (format) {
	case ZFS_KEYFORMAT_RAW:
	bcopy(key_material, key, WRAPPING_KEY_LEN);
	break;
	case ZFS_KEYFORMAT_HEX:
	ret = hex_key_to_raw((char *)key_material,
	WRAPPING_KEY_LEN * 2, key);
	if (ret != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Invalid hex key provided."));
	goto error;
	}
	break;
	case ZFS_KEYFORMAT_PASSPHRASE:
	salt = LE_64(salt);

	ret = PKCS5_PBKDF2_HMAC_SHA1((char *)key_material,
	strlen((char )key_material), ((uint8_t )&salt),
	sizeof (uint64_t), iters, WRAPPING_KEY_LEN, key);
	if (ret != 1) {
	ret = EIO;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Failed to generate key from passphrase."));
	goto error;
	}
	break;
	default:
	ret = EINVAL;
	goto error;
	}

	*key_out = key;
	return (0);

	error:
	free(key);

	*key_out = NULL;
	return (ret);
	}

	static boolean_t
	encryption_feature_is_enabled(zpool_handle_t *zph)
	{
	nvlist_t *features;
	uint64_t feat_refcount;

	/* check that features can be enabled */
	if (zpool_get_prop_int(zph, ZPOOL_PROP_VERSION, NULL)
	< SPA_VERSION_FEATURES)
	return (B_FALSE);

	/* check for crypto feature */
	features = zpool_get_features(zph);
	if (!features \|\| nvlist_lookup_uint64(features,
	spa_feature_table[SPA_FEATURE_ENCRYPTION].fi_guid,
	&feat_refcount) != 0)
	return (B_FALSE);

	return (B_TRUE);
	}

	static int
	populate_create_encryption_params_nvlists(libzfs_handle_t *hdl,
	zfs_handle_t *zhp, boolean_t newkey, zfs_keyformat_t keyformat,
	char keylocation, nvlist_t props, uint8_t *wkeydata, uint_t wkeylen)
	{
	int ret;
	uint64_t iters = 0, salt = 0;
	uint8_t *key_material = NULL;
	size_t key_material_len = 0;
	uint8_t *key_data = NULL;
	const char *fsname = (zhp) ? zfs_get_name(zhp) : NULL;

	/* get key material from keyformat and keylocation */
	ret = get_key_material(hdl, B_TRUE, newkey, keyformat, keylocation,
	fsname, &key_material, &key_material_len, NULL);
	if (ret != 0)
	goto error;

	/* passphrase formats require a salt and pbkdf2 iters property */
	if (keyformat == ZFS_KEYFORMAT_PASSPHRASE) {
	/* always generate a new salt */
	ret = pkcs11_get_urandom((uint8_t *)&salt, sizeof (uint64_t));
	if (ret != sizeof (uint64_t)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Failed to generate salt."));
	goto error;
	}

	ret = nvlist_add_uint64(props,
	zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), salt);
	if (ret != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Failed to add salt to properties."));
	goto error;
	}

	/*
	* If not otherwise specified, use the default number of
	* pbkdf2 iterations. If specified, we have already checked
	* that the given value is greater than MIN_PBKDF2_ITERATIONS
	* during zfs_valid_proplist().
	*/
	ret = nvlist_lookup_uint64(props,
	zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), &iters);
	if (ret == ENOENT) {
	iters = DEFAULT_PBKDF2_ITERATIONS;
	ret = nvlist_add_uint64(props,
	zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), iters);
	if (ret != 0)
	goto error;
	} else if (ret != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Failed to get pbkdf2 iterations."));
	goto error;
	}
	} else {
	/* check that pbkdf2iters was not specified by the user */
	ret = nvlist_lookup_uint64(props,
	zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), &iters);
	if (ret == 0) {
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Cannot specify pbkdf2iters with a non-passphrase "
	"keyformat."));
	goto error;
	}
	}

	/* derive a key from the key material */
	ret = derive_key(hdl, keyformat, iters, key_material, key_material_len,
	salt, &key_data);
	if (ret != 0)
	goto error;

	free(key_material);

	*wkeydata = key_data;
	*wkeylen = WRAPPING_KEY_LEN;
	return (0);

	error:
	if (key_material != NULL)
	free(key_material);
	if (key_data != NULL)
	free(key_data);

	*wkeydata = NULL;
	*wkeylen = 0;
	return (ret);
	}

	static boolean_t
	proplist_has_encryption_props(nvlist_t *props)
	{
	int ret;
	uint64_t intval;
	char *strval;

	ret = nvlist_lookup_uint64(props,
	zfs_prop_to_name(ZFS_PROP_ENCRYPTION), &intval);
	if (ret == 0 && intval != ZIO_CRYPT_OFF)
	return (B_TRUE);

	ret = nvlist_lookup_string(props,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION), &strval);
	if (ret == 0 && strcmp(strval, "none") != 0)
	return (B_TRUE);

	ret = nvlist_lookup_uint64(props,
	zfs_prop_to_name(ZFS_PROP_KEYFORMAT), &intval);
	if (ret == 0)
	return (B_TRUE);

	ret = nvlist_lookup_uint64(props,
	zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), &intval);
	if (ret == 0)
	return (B_TRUE);

	return (B_FALSE);
	}

	int
	zfs_crypto_get_encryption_root(zfs_handle_t zhp, boolean_t is_encroot,
	char *buf)
	{
	int ret;
	char prop_encroot[MAXNAMELEN];

	/* if the dataset isn't encrypted, just return */
	if (zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) == ZIO_CRYPT_OFF) {
	*is_encroot = B_FALSE;
	if (buf != NULL)
	buf[0] = '\0';
	return (0);
	}

	ret = zfs_prop_get(zhp, ZFS_PROP_ENCRYPTION_ROOT, prop_encroot,
	sizeof (prop_encroot), NULL, NULL, 0, B_TRUE);
	if (ret != 0) {
	*is_encroot = B_FALSE;
	if (buf != NULL)
	buf[0] = '\0';
	return (ret);
	}

	*is_encroot = strcmp(prop_encroot, zfs_get_name(zhp)) == 0;
	if (buf != NULL)
	strcpy(buf, prop_encroot);

	return (0);
	}

	int
	zfs_crypto_create(libzfs_handle_t hdl, char parent_name, nvlist_t *props,
	nvlist_t pool_props, boolean_t stdin_available, uint8_t *wkeydata_out,
	uint_t *wkeylen_out)
	{
	int ret;
	char errbuf[1024];
	uint64_t crypt = ZIO_CRYPT_INHERIT, pcrypt = ZIO_CRYPT_INHERIT;
	uint64_t keyformat = ZFS_KEYFORMAT_NONE;
	char *keylocation = NULL;
	zfs_handle_t *pzhp = NULL;
	uint8_t *wkeydata = NULL;
	uint_t wkeylen = 0;
	boolean_t local_crypt = B_TRUE;

	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN, "Encryption create error"));

	/* lookup crypt from props */
	ret = nvlist_lookup_uint64(props,
	zfs_prop_to_name(ZFS_PROP_ENCRYPTION), &crypt);
	if (ret != 0)
	local_crypt = B_FALSE;

	/* lookup key location and format from props */
	(void) nvlist_lookup_uint64(props,
	zfs_prop_to_name(ZFS_PROP_KEYFORMAT), &keyformat);
	(void) nvlist_lookup_string(props,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION), &keylocation);

	if (parent_name != NULL) {
	/* get a reference to parent dataset */
	pzhp = make_dataset_handle(hdl, parent_name);
	if (pzhp == NULL) {
	ret = ENOENT;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Failed to lookup parent."));
	goto out;
	}

	/* Lookup parent's crypt */
	pcrypt = zfs_prop_get_int(pzhp, ZFS_PROP_ENCRYPTION);

	/* Params require the encryption feature */
	if (!encryption_feature_is_enabled(pzhp->zpool_hdl)) {
	if (proplist_has_encryption_props(props)) {
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Encryption feature not enabled."));
	goto out;
	}

	ret = 0;
	goto out;
	}
	} else {
	/*
	* special case for root dataset where encryption feature
	* feature won't be on disk yet
	*/
	if (!nvlist_exists(pool_props, "feature@encryption")) {
	if (proplist_has_encryption_props(props)) {
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Encryption feature not enabled."));
	goto out;
	}

	ret = 0;
	goto out;
	}

	pcrypt = ZIO_CRYPT_OFF;
	}

	/* Get the inherited encryption property if we don't have it locally */
	if (!local_crypt)
	crypt = pcrypt;

	/*
	* At this point crypt should be the actual encryption value. If
	* encryption is off just verify that no encryption properties have
	* been specified and return.
	*/
	if (crypt == ZIO_CRYPT_OFF) {
	if (proplist_has_encryption_props(props)) {
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Encryption must be turned on to set encryption "
	"properties."));
	goto out;
	}

	ret = 0;
	goto out;
	}

	/*
	* If we have a parent crypt it is valid to specify encryption alone.
	* This will result in a child that is encrypted with the chosen
	* encryption suite that will also inherit the parent's key. If
	* the parent is not encrypted we need an encryption suite provided.
	*/
	if (pcrypt == ZIO_CRYPT_OFF && keylocation == NULL &&
	keyformat == ZFS_KEYFORMAT_NONE) {
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Keyformat required for new encryption root."));
	goto out;
	}

	/*
	* Specifying a keylocation implies this will be a new encryption root.
	* Check that a keyformat is also specified.
	*/
	if (keylocation != NULL && keyformat == ZFS_KEYFORMAT_NONE) {
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Keyformat required for new encryption root."));
	goto out;
	}

	/* default to prompt if no keylocation is specified */
	if (keyformat != ZFS_KEYFORMAT_NONE && keylocation == NULL) {
	keylocation = "prompt";
	ret = nvlist_add_string(props,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION), keylocation);
	if (ret != 0)
	goto out;
	}

	/*
	* If a local key is provided, this dataset will be a new
	* encryption root. Populate the encryption params.
	*/
	if (keylocation != NULL) {
	/*
	* 'zfs recv -o keylocation=prompt' won't work because stdin
	* is being used by the send stream, so we disallow it.
	*/
	if (!stdin_available && strcmp(keylocation, "prompt") == 0) {
	ret = EINVAL;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "Cannot use "
	"'prompt' keylocation because stdin is in use."));
	goto out;
	}

	ret = populate_create_encryption_params_nvlists(hdl, NULL,
	B_TRUE, keyformat, keylocation, props, &wkeydata,
	&wkeylen);
	if (ret != 0)
	goto out;
	}

	if (pzhp != NULL)
	zfs_close(pzhp);

	*wkeydata_out = wkeydata;
	*wkeylen_out = wkeylen;
	return (0);

	out:
	if (pzhp != NULL)
	zfs_close(pzhp);
	if (wkeydata != NULL)
	free(wkeydata);

	*wkeydata_out = NULL;
	*wkeylen_out = 0;
	return (ret);
	}

	int
	zfs_crypto_clone_check(libzfs_handle_t hdl, zfs_handle_t origin_zhp,
	char parent_name, nvlist_t props)
	{
	char errbuf[1024];

	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN, "Encryption clone error"));

	/*
	* No encryption properties should be specified. They will all be
	* inherited from the origin dataset.
	*/
	if (nvlist_exists(props, zfs_prop_to_name(ZFS_PROP_KEYFORMAT)) \|\|
	nvlist_exists(props, zfs_prop_to_name(ZFS_PROP_KEYLOCATION)) \|\|
	nvlist_exists(props, zfs_prop_to_name(ZFS_PROP_ENCRYPTION)) \|\|
	nvlist_exists(props, zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS))) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Encryption properties must inherit from origin dataset."));
	return (EINVAL);
	}

	return (0);
	}

	typedef struct loadkeys_cbdata {
	uint64_t cb_numfailed;
	uint64_t cb_numattempted;
	} loadkey_cbdata_t;

	static int
	load_keys_cb(zfs_handle_t zhp, void arg)
	{
	int ret;
	boolean_t is_encroot;
	loadkey_cbdata_t *cb = arg;
	uint64_t keystatus = zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS);

	/* only attempt to load keys for encryption roots */
	ret = zfs_crypto_get_encryption_root(zhp, &is_encroot, NULL);
	if (ret != 0 \|\| !is_encroot)
	goto out;

	/* don't attempt to load already loaded keys */
	if (keystatus == ZFS_KEYSTATUS_AVAILABLE)
	goto out;

	/* Attempt to load the key. Record status in cb. */
	cb->cb_numattempted++;

	ret = zfs_crypto_load_key(zhp, B_FALSE, NULL);
	if (ret)
	cb->cb_numfailed++;

	out:
	(void) zfs_iter_filesystems(zhp, load_keys_cb, cb);
	zfs_close(zhp);

	/* always return 0, since this function is best effort */
	return (0);
	}

	/*
	* This function is best effort. It attempts to load all the keys for the given
	* filesystem and all of its children.
	*/
	int
	zfs_crypto_attempt_load_keys(libzfs_handle_t hdl, char fsname)
	{
	int ret;
	zfs_handle_t *zhp = NULL;
	loadkey_cbdata_t cb = { 0 };

	zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL) {
	ret = ENOENT;
	goto error;
	}

	ret = load_keys_cb(zfs_handle_dup(zhp), &cb);
	if (ret)
	goto error;

	(void) printf(gettext("%llu / %llu keys successfully loaded\n"),
	(u_longlong_t)(cb.cb_numattempted - cb.cb_numfailed),
	(u_longlong_t)cb.cb_numattempted);

	if (cb.cb_numfailed != 0) {
	ret = -1;
	goto error;
	}

	zfs_close(zhp);
	return (0);

	error:
	if (zhp != NULL)
	zfs_close(zhp);
	return (ret);
	}

	int
	zfs_crypto_load_key(zfs_handle_t zhp, boolean_t noop, char alt_keylocation)
	{
	int ret, attempts = 0;
	char errbuf[1024];
	uint64_t keystatus, iters = 0, salt = 0;
	uint64_t keyformat = ZFS_KEYFORMAT_NONE;
	char prop_keylocation[MAXNAMELEN];
	char prop_encroot[MAXNAMELEN];
	char *keylocation = NULL;
	uint8_t key_material = NULL, key_data = NULL;
	size_t key_material_len;
	boolean_t is_encroot, can_retry = B_FALSE, correctible = B_FALSE;

	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN, "Key load error"));

	/* check that encryption is enabled for the pool */
	if (!encryption_feature_is_enabled(zhp->zpool_hdl)) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Encryption feature not enabled."));
	ret = EINVAL;
	goto error;
	}

	/* Fetch the keyformat. Check that the dataset is encrypted. */
	keyformat = zfs_prop_get_int(zhp, ZFS_PROP_KEYFORMAT);
	if (keyformat == ZFS_KEYFORMAT_NONE) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"'%s' is not encrypted."), zfs_get_name(zhp));
	ret = EINVAL;
	goto error;
	}

	/*
	* Fetch the key location. Check that we are working with an
	* encryption root.
	*/
	ret = zfs_crypto_get_encryption_root(zhp, &is_encroot, prop_encroot);
	if (ret != 0) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Failed to get encryption root for '%s'."),
	zfs_get_name(zhp));
	goto error;
	} else if (!is_encroot) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Keys must be loaded for encryption root of '%s' (%s)."),
	zfs_get_name(zhp), prop_encroot);
	ret = EINVAL;
	goto error;
	}

	/*
	* if the caller has elected to override the keylocation property
	* use that instead
	*/
	if (alt_keylocation != NULL) {
	keylocation = alt_keylocation;
	} else {
	ret = zfs_prop_get(zhp, ZFS_PROP_KEYLOCATION, prop_keylocation,
	sizeof (prop_keylocation), NULL, NULL, 0, B_TRUE);
	if (ret != 0) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Failed to get keylocation for '%s'."),
	zfs_get_name(zhp));
	goto error;
	}

	keylocation = prop_keylocation;
	}

	/* check that the key is unloaded unless this is a noop */
	if (!noop) {
	keystatus = zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS);
	if (keystatus == ZFS_KEYSTATUS_AVAILABLE) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Key already loaded for '%s'."), zfs_get_name(zhp));
	ret = EEXIST;
	goto error;
	}
	}

	/* passphrase formats require a salt and pbkdf2_iters property */
	if (keyformat == ZFS_KEYFORMAT_PASSPHRASE) {
	salt = zfs_prop_get_int(zhp, ZFS_PROP_PBKDF2_SALT);
	iters = zfs_prop_get_int(zhp, ZFS_PROP_PBKDF2_ITERS);
	}

	try_again:
	/* fetching and deriving the key are correctable errors. set the flag */
	correctible = B_TRUE;

	/* get key material from key format and location */
	ret = get_key_material(zhp->zfs_hdl, B_FALSE, B_FALSE, keyformat,
	keylocation, zfs_get_name(zhp), &key_material, &key_material_len,
	&can_retry);
	if (ret != 0)
	goto error;

	/* derive a key from the key material */
	ret = derive_key(zhp->zfs_hdl, keyformat, iters, key_material,
	key_material_len, salt, &key_data);
	if (ret != 0)
	goto error;

	correctible = B_FALSE;

	/* pass the wrapping key and noop flag to the ioctl */
	ret = lzc_load_key(zhp->zfs_name, noop, key_data, WRAPPING_KEY_LEN);
	if (ret != 0) {
	switch (ret) {
	case EPERM:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Permission denied."));
	break;
	case EINVAL:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Invalid parameters provided for dataset %s."),
	zfs_get_name(zhp));
	break;
	case EEXIST:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Key already loaded for '%s'."), zfs_get_name(zhp));
	break;
	case EBUSY:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"'%s' is busy."), zfs_get_name(zhp));
	break;
	case EACCES:
	correctible = B_TRUE;
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Incorrect key provided for '%s'."),
	zfs_get_name(zhp));
	break;
	}
	goto error;
	}

	free(key_material);
	free(key_data);

	return (0);

	error:
	zfs_error(zhp->zfs_hdl, EZFS_CRYPTOFAILED, errbuf);
	if (key_material != NULL) {
	free(key_material);
	key_material = NULL;
	}
	if (key_data != NULL) {
	free(key_data);
	key_data = NULL;
	}

	/*
	* Here we decide if it is ok to allow the user to retry entering their
	* key. The can_retry flag will be set if the user is entering their
	* key from an interactive prompt. The correctable flag will only be
	* set if an error that occurred could be corrected by retrying. Both
	* flags are needed to allow the user to attempt key entry again
	*/
	attempts++;
	if (can_retry && correctible && attempts < MAX_KEY_PROMPT_ATTEMPTS)
	goto try_again;

	return (ret);
	}

	int
	zfs_crypto_unload_key(zfs_handle_t *zhp)
	{
	int ret;
	char errbuf[1024];
	char prop_encroot[MAXNAMELEN];
	uint64_t keystatus, keyformat;
	boolean_t is_encroot;

	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN, "Key unload error"));

	/* check that encryption is enabled for the pool */
	if (!encryption_feature_is_enabled(zhp->zpool_hdl)) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Encryption feature not enabled."));
	ret = EINVAL;
	goto error;
	}

	/* Fetch the keyformat. Check that the dataset is encrypted. */
	keyformat = zfs_prop_get_int(zhp, ZFS_PROP_KEYFORMAT);
	if (keyformat == ZFS_KEYFORMAT_NONE) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"'%s' is not encrypted."), zfs_get_name(zhp));
	ret = EINVAL;
	goto error;
	}

	/*
	* Fetch the key location. Check that we are working with an
	* encryption root.
	*/
	ret = zfs_crypto_get_encryption_root(zhp, &is_encroot, prop_encroot);
	if (ret != 0) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Failed to get encryption root for '%s'."),
	zfs_get_name(zhp));
	goto error;
	} else if (!is_encroot) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Keys must be unloaded for encryption root of '%s' (%s)."),
	zfs_get_name(zhp), prop_encroot);
	ret = EINVAL;
	goto error;
	}

	/* check that the key is loaded */
	keystatus = zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS);
	if (keystatus == ZFS_KEYSTATUS_UNAVAILABLE) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Key already unloaded for '%s'."), zfs_get_name(zhp));
	ret = EACCES;
	goto error;
	}

	/* call the ioctl */
	ret = lzc_unload_key(zhp->zfs_name);

	if (ret != 0) {
	switch (ret) {
	case EPERM:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Permission denied."));
	break;
	case EACCES:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Key already unloaded for '%s'."),
	zfs_get_name(zhp));
	break;
	case EBUSY:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"'%s' is busy."), zfs_get_name(zhp));
	break;
	}
	zfs_error(zhp->zfs_hdl, EZFS_CRYPTOFAILED, errbuf);
	}

	return (ret);

	error:
	zfs_error(zhp->zfs_hdl, EZFS_CRYPTOFAILED, errbuf);
	return (ret);
	}

	static int
	zfs_crypto_verify_rewrap_nvlist(zfs_handle_t zhp, nvlist_t props,
	nvlist_t *props_out, char errbuf)
	{
	int ret;
	nvpair_t *elem = NULL;
	zfs_prop_t prop;
	nvlist_t *new_props = NULL;

	new_props = fnvlist_alloc();

	/*
	* loop through all provided properties, we should only have
	* keyformat, keylocation and pbkdf2iters. The actual validation of
	* values is done by zfs_valid_proplist().
	*/
	while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
	const char *propname = nvpair_name(elem);
	prop = zfs_name_to_prop(propname);

	switch (prop) {
	case ZFS_PROP_PBKDF2_ITERS:
	case ZFS_PROP_KEYFORMAT:
	case ZFS_PROP_KEYLOCATION:
	break;
	default:
	ret = EINVAL;
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Only keyformat, keylocation and pbkdf2iters may "
	"be set with this command."));
	goto error;
	}
	}

	new_props = zfs_valid_proplist(zhp->zfs_hdl, zhp->zfs_type, props,
	zfs_prop_get_int(zhp, ZFS_PROP_ZONED), NULL, zhp->zpool_hdl,
	B_TRUE, errbuf);
	if (new_props == NULL) {
	ret = EINVAL;
	goto error;
	}

	*props_out = new_props;
	return (0);

	error:
	nvlist_free(new_props);
	*props_out = NULL;
	return (ret);
	}

	int
	zfs_crypto_rewrap(zfs_handle_t zhp, nvlist_t raw_props, boolean_t inheritkey)
	{
	int ret;
	char errbuf[1024];
	boolean_t is_encroot;
	nvlist_t *props = NULL;
	uint8_t *wkeydata = NULL;
	uint_t wkeylen = 0;
	dcp_cmd_t cmd = (inheritkey) ? DCP_CMD_INHERIT : DCP_CMD_NEW_KEY;
	uint64_t crypt, pcrypt, keystatus, pkeystatus;
	uint64_t keyformat = ZFS_KEYFORMAT_NONE;
	zfs_handle_t *pzhp = NULL;
	char *keylocation = NULL;
	char origin_name[MAXNAMELEN];
	char prop_keylocation[MAXNAMELEN];
	char parent_name[ZFS_MAX_DATASET_NAME_LEN];

	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN, "Key change error"));

	/* check that encryption is enabled for the pool */
	if (!encryption_feature_is_enabled(zhp->zpool_hdl)) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Encryption feature not enabled."));
	ret = EINVAL;
	goto error;
	}

	/* get crypt from dataset */
	crypt = zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION);
	if (crypt == ZIO_CRYPT_OFF) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Dataset not encrypted."));
	ret = EINVAL;
	goto error;
	}

	/* get the encryption root of the dataset */
	ret = zfs_crypto_get_encryption_root(zhp, &is_encroot, NULL);
	if (ret != 0) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Failed to get encryption root for '%s'."),
	zfs_get_name(zhp));
	goto error;
	}

	/* Clones use their origin's key and cannot rewrap it */
	ret = zfs_prop_get(zhp, ZFS_PROP_ORIGIN, origin_name,
	sizeof (origin_name), NULL, NULL, 0, B_TRUE);
	if (ret == 0 && strcmp(origin_name, "") != 0) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Keys cannot be changed on clones."));
	ret = EINVAL;
	goto error;
	}

	/*
	* If the user wants to use the inheritkey variant of this function
	* we don't need to collect any crypto arguments.
	*/
	if (!inheritkey) {
	/* validate the provided properties */
	ret = zfs_crypto_verify_rewrap_nvlist(zhp, raw_props, &props,
	errbuf);
	if (ret != 0)
	goto error;

	/*
	* Load keyformat and keylocation from the nvlist. Fetch from
	* the dataset properties if not specified.
	*/
	(void) nvlist_lookup_uint64(props,
	zfs_prop_to_name(ZFS_PROP_KEYFORMAT), &keyformat);
	(void) nvlist_lookup_string(props,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION), &keylocation);

	if (is_encroot) {
	/*
	* If this is already an encryption root, just keep
	* any properties not set by the user.
	*/
	if (keyformat == ZFS_KEYFORMAT_NONE) {
	keyformat = zfs_prop_get_int(zhp,
	ZFS_PROP_KEYFORMAT);
	ret = nvlist_add_uint64(props,
	zfs_prop_to_name(ZFS_PROP_KEYFORMAT),
	keyformat);
	if (ret != 0) {
	zfs_error_aux(zhp->zfs_hdl,
	dgettext(TEXT_DOMAIN, "Failed to "
	"get existing keyformat "
	"property."));
	goto error;
	}
	}

	if (keylocation == NULL) {
	ret = zfs_prop_get(zhp, ZFS_PROP_KEYLOCATION,
	prop_keylocation, sizeof (prop_keylocation),
	NULL, NULL, 0, B_TRUE);
	if (ret != 0) {
	zfs_error_aux(zhp->zfs_hdl,
	dgettext(TEXT_DOMAIN, "Failed to "
	"get existing keylocation "
	"property."));
	goto error;
	}

	keylocation = prop_keylocation;
	}
	} else {
	/* need a new key for non-encryption roots */
	if (keyformat == ZFS_KEYFORMAT_NONE) {
	ret = EINVAL;
	zfs_error_aux(zhp->zfs_hdl,
	dgettext(TEXT_DOMAIN, "Keyformat required "
	"for new encryption root."));
	goto error;
	}

	/* default to prompt if no keylocation is specified */
	if (keylocation == NULL) {
	keylocation = "prompt";
	ret = nvlist_add_string(props,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
	keylocation);
	if (ret != 0)
	goto error;
	}
	}

	/* fetch the new wrapping key and associated properties */
	ret = populate_create_encryption_params_nvlists(zhp->zfs_hdl,
	zhp, B_TRUE, keyformat, keylocation, props, &wkeydata,
	&wkeylen);
	if (ret != 0)
	goto error;
	} else {
	/* check that zhp is an encryption root */
	if (!is_encroot) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Key inheritting can only be performed on "
	"encryption roots."));
	ret = EINVAL;
	goto error;
	}

	/* get the parent's name */
	ret = zfs_parent_name(zhp, parent_name, sizeof (parent_name));
	if (ret != 0) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Root dataset cannot inherit key."));
	ret = EINVAL;
	goto error;
	}

	/* get a handle to the parent */
	pzhp = make_dataset_handle(zhp->zfs_hdl, parent_name);
	if (pzhp == NULL) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Failed to lookup parent."));
	ret = ENOENT;
	goto error;
	}

	/* parent must be encrypted */
	pcrypt = zfs_prop_get_int(pzhp, ZFS_PROP_ENCRYPTION);
	if (pcrypt == ZIO_CRYPT_OFF) {
	zfs_error_aux(pzhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Parent must be encrypted."));
	ret = EINVAL;
	goto error;
	}

	/* check that the parent's key is loaded */
	pkeystatus = zfs_prop_get_int(pzhp, ZFS_PROP_KEYSTATUS);
	if (pkeystatus == ZFS_KEYSTATUS_UNAVAILABLE) {
	zfs_error_aux(pzhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Parent key must be loaded."));
	ret = EACCES;
	goto error;
	}
	}

	/* check that the key is loaded */
	keystatus = zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS);
	if (keystatus == ZFS_KEYSTATUS_UNAVAILABLE) {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Key must be loaded."));
	ret = EACCES;
	goto error;
	}

	/* call the ioctl */
	ret = lzc_change_key(zhp->zfs_name, cmd, props, wkeydata, wkeylen);
	if (ret != 0) {
	switch (ret) {
	case EPERM:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Permission denied."));
	break;
	case EINVAL:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Invalid properties for key change."));
	break;
	case EACCES:
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"Key is not currently loaded."));
	break;
	}
	zfs_error(zhp->zfs_hdl, EZFS_CRYPTOFAILED, errbuf);
	}

	if (pzhp != NULL)
	zfs_close(pzhp);
	if (props != NULL)
	nvlist_free(props);
	if (wkeydata != NULL)
	free(wkeydata);

	return (ret);

	error:
	if (pzhp != NULL)
	zfs_close(pzhp);
	if (props != NULL)
	nvlist_free(props);
	if (wkeydata != NULL)
	free(wkeydata);

	zfs_error(zhp->zfs_hdl, EZFS_CRYPTOFAILED, errbuf);
	return (ret);
	}
	diff --git a/sys/contrib/openzfs/lib/libzfs/libzfs_pool.c b/sys/contrib/openzfs/lib/libzfs/libzfs_pool.c
	index adc36c47f290..58056ac70377 100644
	--- a/sys/contrib/openzfs/lib/libzfs/libzfs_pool.c
	+++ b/sys/contrib/openzfs/lib/libzfs/libzfs_pool.c
	@@ -1,4948 +1,4950 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
	* Copyright (c) 2018 Datto Inc.
	* Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
	* Copyright (c) 2017, Intel Corporation.
	* Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>
	* Copyright (c) 2021, Colm Buckley <colm@tuatha.org>
	*/

	#include <errno.h>
	#include <libintl.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <strings.h>
	#include <unistd.h>
	#include <libgen.h>
	#include <zone.h>
	#include <sys/stat.h>
	#include <sys/efi_partition.h>
	#include <sys/systeminfo.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zfs_sysfs.h>
	#include <sys/vdev_disk.h>
	#include <sys/types.h>
	#include <dlfcn.h>
	#include <libzutil.h>
	#include <fcntl.h>

	#include "zfs_namecheck.h"
	#include "zfs_prop.h"
	#include "libzfs_impl.h"
	#include "zfs_comutil.h"
	#include "zfeature_common.h"

	static boolean_t zpool_vdev_is_interior(const char *name);

	typedef struct prop_flags {
	int create:1; /* Validate property on creation */
	int import:1; /* Validate property on import */
	} prop_flags_t;

	/*
	* ====================================================================
	* zpool property functions
	* ====================================================================
	*/

	static int
	zpool_get_all_props(zpool_handle_t *zhp)
	{
	zfs_cmd_t zc = {"\0"};
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

	if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0)
	return (-1);

	while (zfs_ioctl(hdl, ZFS_IOC_POOL_GET_PROPS, &zc) != 0) {
	if (errno == ENOMEM) {
	if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
	zcmd_free_nvlists(&zc);
	return (-1);
	}
	} else {
	zcmd_free_nvlists(&zc);
	return (-1);
	}
	}

	if (zcmd_read_dst_nvlist(hdl, &zc, &zhp->zpool_props) != 0) {
	zcmd_free_nvlists(&zc);
	return (-1);
	}

	zcmd_free_nvlists(&zc);

	return (0);
	}

	int
	zpool_props_refresh(zpool_handle_t *zhp)
	{
	nvlist_t *old_props;

	old_props = zhp->zpool_props;

	if (zpool_get_all_props(zhp) != 0)
	return (-1);

	nvlist_free(old_props);
	return (0);
	}

	static const char *
	zpool_get_prop_string(zpool_handle_t *zhp, zpool_prop_t prop,
	zprop_source_t *src)
	{
	nvlist_t nv, nvl;
	uint64_t ival;
	char *value;
	zprop_source_t source;

	nvl = zhp->zpool_props;
	if (nvlist_lookup_nvlist(nvl, zpool_prop_to_name(prop), &nv) == 0) {
	verify(nvlist_lookup_uint64(nv, ZPROP_SOURCE, &ival) == 0);
	source = ival;
	verify(nvlist_lookup_string(nv, ZPROP_VALUE, &value) == 0);
	} else {
	source = ZPROP_SRC_DEFAULT;
	if ((value = (char *)zpool_prop_default_string(prop)) == NULL)
	value = "-";
	}

	if (src)
	*src = source;

	return (value);
	}

	uint64_t
	zpool_get_prop_int(zpool_handle_t zhp, zpool_prop_t prop, zprop_source_t src)
	{
	nvlist_t nv, nvl;
	uint64_t value;
	zprop_source_t source;

	if (zhp->zpool_props == NULL && zpool_get_all_props(zhp)) {
	/*
	* zpool_get_all_props() has most likely failed because
	* the pool is faulted, but if all we need is the top level
	* vdev's guid then get it from the zhp config nvlist.
	*/
	if ((prop == ZPOOL_PROP_GUID) &&
	(nvlist_lookup_nvlist(zhp->zpool_config,
	ZPOOL_CONFIG_VDEV_TREE, &nv) == 0) &&
	(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &value)
	== 0)) {
	return (value);
	}
	return (zpool_prop_default_numeric(prop));
	}

	nvl = zhp->zpool_props;
	if (nvlist_lookup_nvlist(nvl, zpool_prop_to_name(prop), &nv) == 0) {
	verify(nvlist_lookup_uint64(nv, ZPROP_SOURCE, &value) == 0);
	source = value;
	verify(nvlist_lookup_uint64(nv, ZPROP_VALUE, &value) == 0);
	} else {
	source = ZPROP_SRC_DEFAULT;
	value = zpool_prop_default_numeric(prop);
	}

	if (src)
	*src = source;

	return (value);
	}

	/*
	* Map VDEV STATE to printed strings.
	*/
	const char *
	zpool_state_to_name(vdev_state_t state, vdev_aux_t aux)
	{
	switch (state) {
	case VDEV_STATE_CLOSED:
	case VDEV_STATE_OFFLINE:
	return (gettext("OFFLINE"));
	case VDEV_STATE_REMOVED:
	return (gettext("REMOVED"));
	case VDEV_STATE_CANT_OPEN:
	if (aux == VDEV_AUX_CORRUPT_DATA \|\| aux == VDEV_AUX_BAD_LOG)
	return (gettext("FAULTED"));
	else if (aux == VDEV_AUX_SPLIT_POOL)
	return (gettext("SPLIT"));
	else
	return (gettext("UNAVAIL"));
	case VDEV_STATE_FAULTED:
	return (gettext("FAULTED"));
	case VDEV_STATE_DEGRADED:
	return (gettext("DEGRADED"));
	case VDEV_STATE_HEALTHY:
	return (gettext("ONLINE"));

	default:
	break;
	}

	return (gettext("UNKNOWN"));
	}

	/*
	* Map POOL STATE to printed strings.
	*/
	const char *
	zpool_pool_state_to_name(pool_state_t state)
	{
	switch (state) {
	default:
	break;
	case POOL_STATE_ACTIVE:
	return (gettext("ACTIVE"));
	case POOL_STATE_EXPORTED:
	return (gettext("EXPORTED"));
	case POOL_STATE_DESTROYED:
	return (gettext("DESTROYED"));
	case POOL_STATE_SPARE:
	return (gettext("SPARE"));
	case POOL_STATE_L2CACHE:
	return (gettext("L2CACHE"));
	case POOL_STATE_UNINITIALIZED:
	return (gettext("UNINITIALIZED"));
	case POOL_STATE_UNAVAIL:
	return (gettext("UNAVAIL"));
	case POOL_STATE_POTENTIALLY_ACTIVE:
	return (gettext("POTENTIALLY_ACTIVE"));
	}

	return (gettext("UNKNOWN"));
	}

	/*
	* Given a pool handle, return the pool health string ("ONLINE", "DEGRADED",
	* "SUSPENDED", etc).
	*/
	const char *
	zpool_get_state_str(zpool_handle_t *zhp)
	{
	zpool_errata_t errata;
	zpool_status_t status;
	nvlist_t *nvroot;
	vdev_stat_t *vs;
	uint_t vsc;
	const char *str;

	status = zpool_get_status(zhp, NULL, &errata);

	if (zpool_get_state(zhp) == POOL_STATE_UNAVAIL) {
	str = gettext("FAULTED");
	} else if (status == ZPOOL_STATUS_IO_FAILURE_WAIT \|\|
	status == ZPOOL_STATUS_IO_FAILURE_MMP) {
	str = gettext("SUSPENDED");
	} else {
	verify(nvlist_lookup_nvlist(zpool_get_config(zhp, NULL),
	ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
	verify(nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc)
	== 0);
	str = zpool_state_to_name(vs->vs_state, vs->vs_aux);
	}
	return (str);
	}

	/*
	* Get a zpool property value for 'prop' and return the value in
	* a pre-allocated buffer.
	*/
	int
	zpool_get_prop(zpool_handle_t zhp, zpool_prop_t prop, char buf,
	size_t len, zprop_source_t *srctype, boolean_t literal)
	{
	uint64_t intval;
	const char *strval;
	zprop_source_t src = ZPROP_SRC_NONE;

	if (zpool_get_state(zhp) == POOL_STATE_UNAVAIL) {
	switch (prop) {
	case ZPOOL_PROP_NAME:
	(void) strlcpy(buf, zpool_get_name(zhp), len);
	break;

	case ZPOOL_PROP_HEALTH:
	(void) strlcpy(buf, zpool_get_state_str(zhp), len);
	break;

	case ZPOOL_PROP_GUID:
	intval = zpool_get_prop_int(zhp, prop, &src);
	(void) snprintf(buf, len, "%llu", (u_longlong_t)intval);
	break;

	case ZPOOL_PROP_ALTROOT:
	case ZPOOL_PROP_CACHEFILE:
	case ZPOOL_PROP_COMMENT:
	case ZPOOL_PROP_COMPATIBILITY:
	if (zhp->zpool_props != NULL \|\|
	zpool_get_all_props(zhp) == 0) {
	(void) strlcpy(buf,
	zpool_get_prop_string(zhp, prop, &src),
	len);
	break;
	}
	/* FALLTHROUGH */
	default:
	(void) strlcpy(buf, "-", len);
	break;
	}

	if (srctype != NULL)
	*srctype = src;
	return (0);
	}

	if (zhp->zpool_props == NULL && zpool_get_all_props(zhp) &&
	prop != ZPOOL_PROP_NAME)
	return (-1);

	switch (zpool_prop_get_type(prop)) {
	case PROP_TYPE_STRING:
	(void) strlcpy(buf, zpool_get_prop_string(zhp, prop, &src),
	len);
	break;

	case PROP_TYPE_NUMBER:
	intval = zpool_get_prop_int(zhp, prop, &src);

	switch (prop) {
	case ZPOOL_PROP_SIZE:
	case ZPOOL_PROP_ALLOCATED:
	case ZPOOL_PROP_FREE:
	case ZPOOL_PROP_FREEING:
	case ZPOOL_PROP_LEAKED:
	case ZPOOL_PROP_ASHIFT:
	if (literal)
	(void) snprintf(buf, len, "%llu",
	(u_longlong_t)intval);
	else
	(void) zfs_nicenum(intval, buf, len);
	break;

	case ZPOOL_PROP_EXPANDSZ:
	case ZPOOL_PROP_CHECKPOINT:
	if (intval == 0) {
	(void) strlcpy(buf, "-", len);
	} else if (literal) {
	(void) snprintf(buf, len, "%llu",
	(u_longlong_t)intval);
	} else {
	(void) zfs_nicebytes(intval, buf, len);
	}
	break;

	case ZPOOL_PROP_CAPACITY:
	if (literal) {
	(void) snprintf(buf, len, "%llu",
	(u_longlong_t)intval);
	} else {
	(void) snprintf(buf, len, "%llu%%",
	(u_longlong_t)intval);
	}
	break;

	case ZPOOL_PROP_FRAGMENTATION:
	if (intval == UINT64_MAX) {
	(void) strlcpy(buf, "-", len);
	} else if (literal) {
	(void) snprintf(buf, len, "%llu",
	(u_longlong_t)intval);
	} else {
	(void) snprintf(buf, len, "%llu%%",
	(u_longlong_t)intval);
	}
	break;

	case ZPOOL_PROP_DEDUPRATIO:
	if (literal)
	(void) snprintf(buf, len, "%llu.%02llu",
	(u_longlong_t)(intval / 100),
	(u_longlong_t)(intval % 100));
	else
	(void) snprintf(buf, len, "%llu.%02llux",
	(u_longlong_t)(intval / 100),
	(u_longlong_t)(intval % 100));
	break;

	case ZPOOL_PROP_HEALTH:
	(void) strlcpy(buf, zpool_get_state_str(zhp), len);
	break;
	case ZPOOL_PROP_VERSION:
	if (intval >= SPA_VERSION_FEATURES) {
	(void) snprintf(buf, len, "-");
	break;
	}
	/* FALLTHROUGH */
	default:
	(void) snprintf(buf, len, "%llu", (u_longlong_t)intval);
	}
	break;

	case PROP_TYPE_INDEX:
	intval = zpool_get_prop_int(zhp, prop, &src);
	if (zpool_prop_index_to_string(prop, intval, &strval)
	!= 0)
	return (-1);
	(void) strlcpy(buf, strval, len);
	break;

	default:
	abort();
	}

	if (srctype)
	*srctype = src;

	return (0);
	}

	/*
	* Check if the bootfs name has the same pool name as it is set to.
	* Assuming bootfs is a valid dataset name.
	*/
	static boolean_t
	bootfs_name_valid(const char pool, const char bootfs)
	{
	int len = strlen(pool);
	if (bootfs[0] == '\0')
	return (B_TRUE);

	if (!zfs_name_valid(bootfs, ZFS_TYPE_FILESYSTEM\|ZFS_TYPE_SNAPSHOT))
	return (B_FALSE);

	if (strncmp(pool, bootfs, len) == 0 &&
	(bootfs[len] == '/' \|\| bootfs[len] == '\0'))
	return (B_TRUE);

	return (B_FALSE);
	}

	/*
	* Given an nvlist of zpool properties to be set, validate that they are
	* correct, and parse any numeric properties (index, boolean, etc) if they are
	* specified as strings.
	*/
	static nvlist_t *
	zpool_valid_proplist(libzfs_handle_t hdl, const char poolname,
	nvlist_t props, uint64_t version, prop_flags_t flags, char errbuf)
	{
	nvpair_t *elem;
	nvlist_t *retprops;
	zpool_prop_t prop;
	char *strval;
	uint64_t intval;
	char slash, check;
	struct stat64 statbuf;
	zpool_handle_t *zhp;
	char report[1024];

	if (nvlist_alloc(&retprops, NV_UNIQUE_NAME, 0) != 0) {
	(void) no_memory(hdl);
	return (NULL);
	}

	elem = NULL;
	while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
	const char *propname = nvpair_name(elem);

	prop = zpool_name_to_prop(propname);
	if (prop == ZPOOL_PROP_INVAL && zpool_prop_feature(propname)) {
	int err;
	char *fname = strchr(propname, '@') + 1;

	err = zfeature_lookup_name(fname, NULL);
	if (err != 0) {
	ASSERT3U(err, ==, ENOENT);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"feature '%s' unsupported by kernel"),
	fname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	if (nvpair_type(elem) != DATA_TYPE_STRING) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"'%s' must be a string"), propname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	(void) nvpair_value_string(elem, &strval);
	if (strcmp(strval, ZFS_FEATURE_ENABLED) != 0 &&
	strcmp(strval, ZFS_FEATURE_DISABLED) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' can only be set to "
	"'enabled' or 'disabled'"), propname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	if (!flags.create &&
	strcmp(strval, ZFS_FEATURE_DISABLED) == 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' can only be set to "
	"'disabled' at creation time"), propname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	if (nvlist_add_uint64(retprops, propname, 0) != 0) {
	(void) no_memory(hdl);
	goto error;
	}
	continue;
	}

	/*
	* Make sure this property is valid and applies to this type.
	*/
	if (prop == ZPOOL_PROP_INVAL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"invalid property '%s'"), propname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	if (zpool_prop_readonly(prop)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "'%s' "
	"is readonly"), propname);
	(void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
	goto error;
	}

	if (!flags.create && zpool_prop_setonce(prop)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' can only be set at "
	"creation time"), propname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	if (zprop_parse_value(hdl, elem, prop, ZFS_TYPE_POOL, retprops,
	&strval, &intval, errbuf) != 0)
	goto error;

	/*
	* Perform additional checking for specific properties.
	*/
	switch (prop) {
	case ZPOOL_PROP_VERSION:
	if (intval < version \|\|
	!SPA_VERSION_IS_SUPPORTED(intval)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' number %llu is invalid."),
	propname, (unsigned long long)intval);
	(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
	goto error;
	}
	break;

	case ZPOOL_PROP_ASHIFT:
	if (intval != 0 &&
	(intval < ASHIFT_MIN \|\| intval > ASHIFT_MAX)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' number %llu is invalid, "
	"only values between %" PRId32 " and %"
	PRId32 " are allowed."),
	propname, (unsigned long long)intval,
	ASHIFT_MIN, ASHIFT_MAX);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}
	break;

	case ZPOOL_PROP_BOOTFS:
	if (flags.create \|\| flags.import) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' cannot be set at creation "
	"or import time"), propname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	if (version < SPA_VERSION_BOOTFS) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"pool must be upgraded to support "
	"'%s' property"), propname);
	(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
	goto error;
	}

	/*
	* bootfs property value has to be a dataset name and
	* the dataset has to be in the same pool as it sets to.
	*/
	if (!bootfs_name_valid(poolname, strval)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "'%s' "
	"is an invalid name"), strval);
	(void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
	goto error;
	}

	if ((zhp = zpool_open_canfail(hdl, poolname)) == NULL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"could not open pool '%s'"), poolname);
	(void) zfs_error(hdl, EZFS_OPENFAILED, errbuf);
	goto error;
	}
	zpool_close(zhp);
	break;

	case ZPOOL_PROP_ALTROOT:
	if (!flags.create && !flags.import) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' can only be set during pool "
	"creation or import"), propname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	if (strval[0] != '/') {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"bad alternate root '%s'"), strval);
	(void) zfs_error(hdl, EZFS_BADPATH, errbuf);
	goto error;
	}
	break;

	case ZPOOL_PROP_CACHEFILE:
	if (strval[0] == '\0')
	break;

	if (strcmp(strval, "none") == 0)
	break;

	if (strval[0] != '/') {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' must be empty, an "
	"absolute path, or 'none'"), propname);
	(void) zfs_error(hdl, EZFS_BADPATH, errbuf);
	goto error;
	}

	slash = strrchr(strval, '/');

	if (slash[1] == '\0' \|\| strcmp(slash, "/.") == 0 \|\|
	strcmp(slash, "/..") == 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"'%s' is not a valid file"), strval);
	(void) zfs_error(hdl, EZFS_BADPATH, errbuf);
	goto error;
	}

	*slash = '\0';

	if (strval[0] != '\0' &&
	(stat64(strval, &statbuf) != 0 \|\|
	!S_ISDIR(statbuf.st_mode))) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"'%s' is not a valid directory"),
	strval);
	(void) zfs_error(hdl, EZFS_BADPATH, errbuf);
	goto error;
	}

	*slash = '/';
	break;

	case ZPOOL_PROP_COMPATIBILITY:
	switch (zpool_load_compat(strval, NULL, report, 1024)) {
	case ZPOOL_COMPATIBILITY_OK:
	case ZPOOL_COMPATIBILITY_WARNTOKEN:
	break;
	case ZPOOL_COMPATIBILITY_BADFILE:
	case ZPOOL_COMPATIBILITY_BADTOKEN:
	case ZPOOL_COMPATIBILITY_NOFILES:
	zfs_error_aux(hdl, "%s", report);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}
	break;

	case ZPOOL_PROP_COMMENT:
	for (check = strval; *check != '\0'; check++) {
	if (!isprint(*check)) {
	zfs_error_aux(hdl,
	dgettext(TEXT_DOMAIN,
	"comment may only have printable "
	"characters"));
	(void) zfs_error(hdl, EZFS_BADPROP,
	errbuf);
	goto error;
	}
	}
	if (strlen(strval) > ZPROP_MAX_COMMENT) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"comment must not exceed %d characters"),
	ZPROP_MAX_COMMENT);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}
	break;
	case ZPOOL_PROP_READONLY:
	if (!flags.import) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' can only be set at "
	"import time"), propname);
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}
	break;
	case ZPOOL_PROP_MULTIHOST:
	if (get_system_hostid() == 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"requires a non-zero system hostid"));
	(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}
	break;
	case ZPOOL_PROP_DEDUPDITTO:
	printf("Note: property '%s' no longer has "
	"any effect\n", propname);
	break;

	default:
	break;
	}
	}

	return (retprops);
	error:
	nvlist_free(retprops);
	return (NULL);
	}

	/*
	* Set zpool property : propname=propval.
	*/
	int
	zpool_set_prop(zpool_handle_t zhp, const char propname, const char *propval)
	{
	zfs_cmd_t zc = {"\0"};
	int ret = -1;
	char errbuf[1024];
	nvlist_t *nvl = NULL;
	nvlist_t *realprops;
	uint64_t version;
	prop_flags_t flags = { 0 };

	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
	zhp->zpool_name);

	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
	return (no_memory(zhp->zpool_hdl));

	if (nvlist_add_string(nvl, propname, propval) != 0) {
	nvlist_free(nvl);
	return (no_memory(zhp->zpool_hdl));
	}

	version = zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL);
	if ((realprops = zpool_valid_proplist(zhp->zpool_hdl,
	zhp->zpool_name, nvl, version, flags, errbuf)) == NULL) {
	nvlist_free(nvl);
	return (-1);
	}

	nvlist_free(nvl);
	nvl = realprops;

	/*
	* Execute the corresponding ioctl() to set this property.
	*/
	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

	if (zcmd_write_src_nvlist(zhp->zpool_hdl, &zc, nvl) != 0) {
	nvlist_free(nvl);
	return (-1);
	}

	ret = zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_POOL_SET_PROPS, &zc);

	zcmd_free_nvlists(&zc);
	nvlist_free(nvl);

	if (ret)
	(void) zpool_standard_error(zhp->zpool_hdl, errno, errbuf);
	else
	(void) zpool_props_refresh(zhp);

	return (ret);
	}

	int
	zpool_expand_proplist(zpool_handle_t zhp, zprop_list_t *plp,
	boolean_t literal)
	{
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	zprop_list_t *entry;
	char buf[ZFS_MAXPROPLEN];
	nvlist_t *features = NULL;
	nvpair_t *nvp;
	zprop_list_t **last;
	boolean_t firstexpand = (NULL == *plp);
	int i;

	if (zprop_expand_list(hdl, plp, ZFS_TYPE_POOL) != 0)
	return (-1);

	last = plp;
	while (*last != NULL)
	last = &(*last)->pl_next;

	if ((*plp)->pl_all)
	features = zpool_get_features(zhp);

	if ((*plp)->pl_all && firstexpand) {
	for (i = 0; i < SPA_FEATURES; i++) {
	zprop_list_t *entry = zfs_alloc(hdl,
	sizeof (zprop_list_t));
	entry->pl_prop = ZPROP_INVAL;
	entry->pl_user_prop = zfs_asprintf(hdl, "feature@%s",
	spa_feature_table[i].fi_uname);
	entry->pl_width = strlen(entry->pl_user_prop);
	entry->pl_all = B_TRUE;

	*last = entry;
	last = &entry->pl_next;
	}
	}

	/* add any unsupported features */
	for (nvp = nvlist_next_nvpair(features, NULL);
	nvp != NULL; nvp = nvlist_next_nvpair(features, nvp)) {
	char *propname;
	boolean_t found;
	zprop_list_t *entry;

	if (zfeature_is_supported(nvpair_name(nvp)))
	continue;

	propname = zfs_asprintf(hdl, "unsupported@%s",
	nvpair_name(nvp));

	/*
	* Before adding the property to the list make sure that no
	* other pool already added the same property.
	*/
	found = B_FALSE;
	entry = *plp;
	while (entry != NULL) {
	if (entry->pl_user_prop != NULL &&
	strcmp(propname, entry->pl_user_prop) == 0) {
	found = B_TRUE;
	break;
	}
	entry = entry->pl_next;
	}
	if (found) {
	free(propname);
	continue;
	}

	entry = zfs_alloc(hdl, sizeof (zprop_list_t));
	entry->pl_prop = ZPROP_INVAL;
	entry->pl_user_prop = propname;
	entry->pl_width = strlen(entry->pl_user_prop);
	entry->pl_all = B_TRUE;

	*last = entry;
	last = &entry->pl_next;
	}

	for (entry = *plp; entry != NULL; entry = entry->pl_next) {
	if (entry->pl_fixed && !literal)
	continue;

	if (entry->pl_prop != ZPROP_INVAL &&
	zpool_get_prop(zhp, entry->pl_prop, buf, sizeof (buf),
	NULL, literal) == 0) {
	if (strlen(buf) > entry->pl_width)
	entry->pl_width = strlen(buf);
	}
	}

	return (0);
	}

	/*
	* Get the state for the given feature on the given ZFS pool.
	*/
	int
	zpool_prop_get_feature(zpool_handle_t zhp, const char propname, char *buf,
	size_t len)
	{
	uint64_t refcount;
	boolean_t found = B_FALSE;
	nvlist_t *features = zpool_get_features(zhp);
	boolean_t supported;
	const char *feature = strchr(propname, '@') + 1;

	supported = zpool_prop_feature(propname);
	ASSERT(supported \|\| zpool_prop_unsupported(propname));

	/*
	* Convert from feature name to feature guid. This conversion is
	* unnecessary for unsupported@... properties because they already
	* use guids.
	*/
	if (supported) {
	int ret;
	spa_feature_t fid;

	ret = zfeature_lookup_name(feature, &fid);
	if (ret != 0) {
	(void) strlcpy(buf, "-", len);
	return (ENOTSUP);
	}
	feature = spa_feature_table[fid].fi_guid;
	}

	if (nvlist_lookup_uint64(features, feature, &refcount) == 0)
	found = B_TRUE;

	if (supported) {
	if (!found) {
	(void) strlcpy(buf, ZFS_FEATURE_DISABLED, len);
	} else {
	if (refcount == 0)
	(void) strlcpy(buf, ZFS_FEATURE_ENABLED, len);
	else
	(void) strlcpy(buf, ZFS_FEATURE_ACTIVE, len);
	}
	} else {
	if (found) {
	if (refcount == 0) {
	(void) strcpy(buf, ZFS_UNSUPPORTED_INACTIVE);
	} else {
	(void) strcpy(buf, ZFS_UNSUPPORTED_READONLY);
	}
	} else {
	(void) strlcpy(buf, "-", len);
	return (ENOTSUP);
	}
	}

	return (0);
	}

	/*
	* Validate the given pool name, optionally putting an extended error message in
	* 'buf'.
	*/
	boolean_t
	zpool_name_valid(libzfs_handle_t hdl, boolean_t isopen, const char pool)
	{
	namecheck_err_t why;
	char what;
	int ret;

	ret = pool_namecheck(pool, &why, &what);

	/*
	* The rules for reserved pool names were extended at a later point.
	* But we need to support users with existing pools that may now be
	* invalid. So we only check for this expanded set of names during a
	* create (or import), and only in userland.
	*/
	if (ret == 0 && !isopen &&
	(strncmp(pool, "mirror", 6) == 0 \|\|
	strncmp(pool, "raidz", 5) == 0 \|\|
	strncmp(pool, "draid", 5) == 0 \|\|
	strncmp(pool, "spare", 5) == 0 \|\|
	strcmp(pool, "log") == 0)) {
	if (hdl != NULL)
	zfs_error_aux(hdl,
	dgettext(TEXT_DOMAIN, "name is reserved"));
	return (B_FALSE);
	}


	if (ret != 0) {
	if (hdl != NULL) {
	switch (why) {
	case NAME_ERR_TOOLONG:
	zfs_error_aux(hdl,
	dgettext(TEXT_DOMAIN, "name is too long"));
	break;

	case NAME_ERR_INVALCHAR:
	zfs_error_aux(hdl,
	dgettext(TEXT_DOMAIN, "invalid character "
	"'%c' in pool name"), what);
	break;

	case NAME_ERR_NOLETTER:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"name must begin with a letter"));
	break;

	case NAME_ERR_RESERVED:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"name is reserved"));
	break;

	case NAME_ERR_DISKLIKE:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"pool name is reserved"));
	break;

	case NAME_ERR_LEADING_SLASH:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"leading slash in name"));
	break;

	case NAME_ERR_EMPTY_COMPONENT:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"empty component in name"));
	break;

	case NAME_ERR_TRAILING_SLASH:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"trailing slash in name"));
	break;

	case NAME_ERR_MULTIPLE_DELIMITERS:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"multiple '@' and/or '#' delimiters in "
	"name"));
	break;

	case NAME_ERR_NO_AT:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"permission set is missing '@'"));
	break;

	default:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"(%d) not defined"), why);
	break;
	}
	}
	return (B_FALSE);
	}

	return (B_TRUE);
	}

	/*
	* Open a handle to the given pool, even if the pool is currently in the FAULTED
	* state.
	*/
	zpool_handle_t *
	zpool_open_canfail(libzfs_handle_t hdl, const char pool)
	{
	zpool_handle_t *zhp;
	boolean_t missing;

	/*
	* Make sure the pool name is valid.
	*/
	if (!zpool_name_valid(hdl, B_TRUE, pool)) {
	(void) zfs_error_fmt(hdl, EZFS_INVALIDNAME,
	dgettext(TEXT_DOMAIN, "cannot open '%s'"),
	pool);
	return (NULL);
	}

	if ((zhp = zfs_alloc(hdl, sizeof (zpool_handle_t))) == NULL)
	return (NULL);

	zhp->zpool_hdl = hdl;
	(void) strlcpy(zhp->zpool_name, pool, sizeof (zhp->zpool_name));

	if (zpool_refresh_stats(zhp, &missing) != 0) {
	zpool_close(zhp);
	return (NULL);
	}

	if (missing) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "no such pool"));
	(void) zfs_error_fmt(hdl, EZFS_NOENT,
	dgettext(TEXT_DOMAIN, "cannot open '%s'"), pool);
	zpool_close(zhp);
	return (NULL);
	}

	return (zhp);
	}

	/*
	* Like the above, but silent on error. Used when iterating over pools (because
	* the configuration cache may be out of date).
	*/
	int
	zpool_open_silent(libzfs_handle_t hdl, const char pool, zpool_handle_t **ret)
	{
	zpool_handle_t *zhp;
	boolean_t missing;

	if ((zhp = zfs_alloc(hdl, sizeof (zpool_handle_t))) == NULL)
	return (-1);

	zhp->zpool_hdl = hdl;
	(void) strlcpy(zhp->zpool_name, pool, sizeof (zhp->zpool_name));

	if (zpool_refresh_stats(zhp, &missing) != 0) {
	zpool_close(zhp);
	return (-1);
	}

	if (missing) {
	zpool_close(zhp);
	*ret = NULL;
	return (0);
	}

	*ret = zhp;
	return (0);
	}

	/*
	* Similar to zpool_open_canfail(), but refuses to open pools in the faulted
	* state.
	*/
	zpool_handle_t *
	zpool_open(libzfs_handle_t hdl, const char pool)
	{
	zpool_handle_t *zhp;

	if ((zhp = zpool_open_canfail(hdl, pool)) == NULL)
	return (NULL);

	if (zhp->zpool_state == POOL_STATE_UNAVAIL) {
	(void) zfs_error_fmt(hdl, EZFS_POOLUNAVAIL,
	dgettext(TEXT_DOMAIN, "cannot open '%s'"), zhp->zpool_name);
	zpool_close(zhp);
	return (NULL);
	}

	return (zhp);
	}

	/*
	* Close the handle. Simply frees the memory associated with the handle.
	*/
	void
	zpool_close(zpool_handle_t *zhp)
	{
	nvlist_free(zhp->zpool_config);
	nvlist_free(zhp->zpool_old_config);
	nvlist_free(zhp->zpool_props);
	free(zhp);
	}

	/*
	* Return the name of the pool.
	*/
	const char *
	zpool_get_name(zpool_handle_t *zhp)
	{
	return (zhp->zpool_name);
	}


	/*
	* Return the state of the pool (ACTIVE or UNAVAILABLE)
	*/
	int
	zpool_get_state(zpool_handle_t *zhp)
	{
	return (zhp->zpool_state);
	}

	/*
	* Check if vdev list contains a special vdev
	*/
	static boolean_t
	zpool_has_special_vdev(nvlist_t *nvroot)
	{
	nvlist_t **child;
	uint_t children;

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, &child,
	&children) == 0) {
	for (uint_t c = 0; c < children; c++) {
	char *bias;

	if (nvlist_lookup_string(child[c],
	ZPOOL_CONFIG_ALLOCATION_BIAS, &bias) == 0 &&
	strcmp(bias, VDEV_ALLOC_BIAS_SPECIAL) == 0) {
	return (B_TRUE);
	}
	}
	}
	return (B_FALSE);
	}

	/*
	* Check if vdev list contains a dRAID vdev
	*/
	static boolean_t
	zpool_has_draid_vdev(nvlist_t *nvroot)
	{
	nvlist_t **child;
	uint_t children;

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	&child, &children) == 0) {
	for (uint_t c = 0; c < children; c++) {
	char *type;

	if (nvlist_lookup_string(child[c],
	ZPOOL_CONFIG_TYPE, &type) == 0 &&
	strcmp(type, VDEV_TYPE_DRAID) == 0) {
	return (B_TRUE);
	}
	}
	}
	return (B_FALSE);
	}

	/*
	* Output a dRAID top-level vdev name in to the provided buffer.
	*/
	static char *
	zpool_draid_name(char *name, int len, uint64_t data, uint64_t parity,
	uint64_t spares, uint64_t children)
	{
	snprintf(name, len, "%s%llu:%llud:%lluc:%llus",
	VDEV_TYPE_DRAID, (u_longlong_t)parity, (u_longlong_t)data,
	(u_longlong_t)children, (u_longlong_t)spares);

	return (name);
	}

	/*
	* Return B_TRUE if the provided name is a dRAID spare name.
	*/
	boolean_t
	zpool_is_draid_spare(const char *name)
	{
	uint64_t spare_id, parity, vdev_id;

	if (sscanf(name, VDEV_TYPE_DRAID "%llu-%llu-%llu",
	(u_longlong_t )&parity, (u_longlong_t )&vdev_id,
	(u_longlong_t *)&spare_id) == 3) {
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	/*
	* Create the named pool, using the provided vdev list. It is assumed
	* that the consumer has already validated the contents of the nvlist, so we
	* don't have to worry about error semantics.
	*/
	int
	zpool_create(libzfs_handle_t hdl, const char pool, nvlist_t *nvroot,
	nvlist_t props, nvlist_t fsprops)
	{
	zfs_cmd_t zc = {"\0"};
	nvlist_t *zc_fsprops = NULL;
	nvlist_t *zc_props = NULL;
	nvlist_t *hidden_args = NULL;
	uint8_t *wkeydata = NULL;
	uint_t wkeylen = 0;
	char msg[1024];
	int ret = -1;

	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot create '%s'"), pool);

	if (!zpool_name_valid(hdl, B_FALSE, pool))
	return (zfs_error(hdl, EZFS_INVALIDNAME, msg));

	if (zcmd_write_conf_nvlist(hdl, &zc, nvroot) != 0)
	return (-1);

	if (props) {
	prop_flags_t flags = { .create = B_TRUE, .import = B_FALSE };

	if ((zc_props = zpool_valid_proplist(hdl, pool, props,
	SPA_VERSION_1, flags, msg)) == NULL) {
	goto create_failed;
	}
	}

	if (fsprops) {
	uint64_t zoned;
	char *zonestr;

	zoned = ((nvlist_lookup_string(fsprops,
	zfs_prop_to_name(ZFS_PROP_ZONED), &zonestr) == 0) &&
	strcmp(zonestr, "on") == 0);

	if ((zc_fsprops = zfs_valid_proplist(hdl, ZFS_TYPE_FILESYSTEM,
	fsprops, zoned, NULL, NULL, B_TRUE, msg)) == NULL) {
	goto create_failed;
	}

	if (nvlist_exists(zc_fsprops,
	zfs_prop_to_name(ZFS_PROP_SPECIAL_SMALL_BLOCKS)) &&
	!zpool_has_special_vdev(nvroot)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"%s property requires a special vdev"),
	zfs_prop_to_name(ZFS_PROP_SPECIAL_SMALL_BLOCKS));
	(void) zfs_error(hdl, EZFS_BADPROP, msg);
	goto create_failed;
	}

	if (!zc_props &&
	(nvlist_alloc(&zc_props, NV_UNIQUE_NAME, 0) != 0)) {
	goto create_failed;
	}
	if (zfs_crypto_create(hdl, NULL, zc_fsprops, props, B_TRUE,
	&wkeydata, &wkeylen) != 0) {
	zfs_error(hdl, EZFS_CRYPTOFAILED, msg);
	goto create_failed;
	}
	if (nvlist_add_nvlist(zc_props,
	ZPOOL_ROOTFS_PROPS, zc_fsprops) != 0) {
	goto create_failed;
	}
	if (wkeydata != NULL) {
	if (nvlist_alloc(&hidden_args, NV_UNIQUE_NAME, 0) != 0)
	goto create_failed;

	if (nvlist_add_uint8_array(hidden_args, "wkeydata",
	wkeydata, wkeylen) != 0)
	goto create_failed;

	if (nvlist_add_nvlist(zc_props, ZPOOL_HIDDEN_ARGS,
	hidden_args) != 0)
	goto create_failed;
	}
	}

	if (zc_props && zcmd_write_src_nvlist(hdl, &zc, zc_props) != 0)
	goto create_failed;

	(void) strlcpy(zc.zc_name, pool, sizeof (zc.zc_name));

	if ((ret = zfs_ioctl(hdl, ZFS_IOC_POOL_CREATE, &zc)) != 0) {

	zcmd_free_nvlists(&zc);
	nvlist_free(zc_props);
	nvlist_free(zc_fsprops);
	nvlist_free(hidden_args);
	if (wkeydata != NULL)
	free(wkeydata);

	switch (errno) {
	case EBUSY:
	/*
	* This can happen if the user has specified the same
	* device multiple times. We can't reliably detect this
	* until we try to add it and see we already have a
	* label. This can also happen under if the device is
	* part of an active md or lvm device.
	*/
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"one or more vdevs refer to the same device, or "
	"one of\nthe devices is part of an active md or "
	"lvm device"));
	return (zfs_error(hdl, EZFS_BADDEV, msg));

	case ERANGE:
	/*
	* This happens if the record size is smaller or larger
	* than the allowed size range, or not a power of 2.
	*
	* NOTE: although zfs_valid_proplist is called earlier,
	* this case may have slipped through since the
	* pool does not exist yet and it is therefore
	* impossible to read properties e.g. max blocksize
	* from the pool.
	*/
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"record size invalid"));
	return (zfs_error(hdl, EZFS_BADPROP, msg));

	case EOVERFLOW:
	/*
	* This occurs when one of the devices is below
	* SPA_MINDEVSIZE. Unfortunately, we can't detect which
	* device was the problem device since there's no
	* reliable way to determine device size from userland.
	*/
	{
	char buf[64];

	zfs_nicebytes(SPA_MINDEVSIZE, buf,
	sizeof (buf));

	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"one or more devices is less than the "
	"minimum size (%s)"), buf);
	}
	return (zfs_error(hdl, EZFS_BADDEV, msg));

	case ENOSPC:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"one or more devices is out of space"));
	return (zfs_error(hdl, EZFS_BADDEV, msg));

	case EINVAL:
	if (zpool_has_draid_vdev(nvroot) &&
	zfeature_lookup_name("draid", NULL) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"dRAID vdevs are unsupported by the "
	"kernel"));
	return (zfs_error(hdl, EZFS_BADDEV, msg));
	} else {
	return (zpool_standard_error(hdl, errno, msg));
	}

	default:
	return (zpool_standard_error(hdl, errno, msg));
	}
	}

	create_failed:
	zcmd_free_nvlists(&zc);
	nvlist_free(zc_props);
	nvlist_free(zc_fsprops);
	nvlist_free(hidden_args);
	if (wkeydata != NULL)
	free(wkeydata);
	return (ret);
	}

	/*
	* Destroy the given pool. It is up to the caller to ensure that there are no
	* datasets left in the pool.
	*/
	int
	zpool_destroy(zpool_handle_t zhp, const char log_str)
	{
	zfs_cmd_t zc = {"\0"};
	zfs_handle_t *zfp = NULL;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	char msg[1024];

	if (zhp->zpool_state == POOL_STATE_ACTIVE &&
	(zfp = zfs_open(hdl, zhp->zpool_name, ZFS_TYPE_FILESYSTEM)) == NULL)
	return (-1);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	zc.zc_history = (uint64_t)(uintptr_t)log_str;

	if (zfs_ioctl(hdl, ZFS_IOC_POOL_DESTROY, &zc) != 0) {
	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot destroy '%s'"), zhp->zpool_name);

	if (errno == EROFS) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"one or more devices is read only"));
	(void) zfs_error(hdl, EZFS_BADDEV, msg);
	} else {
	(void) zpool_standard_error(hdl, errno, msg);
	}

	if (zfp)
	zfs_close(zfp);
	return (-1);
	}

	if (zfp) {
	remove_mountpoint(zfp);
	zfs_close(zfp);
	}

	return (0);
	}

	/*
	* Create a checkpoint in the given pool.
	*/
	int
	zpool_checkpoint(zpool_handle_t *zhp)
	{
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	char msg[1024];
	int error;

	error = lzc_pool_checkpoint(zhp->zpool_name);
	if (error != 0) {
	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot checkpoint '%s'"), zhp->zpool_name);
	(void) zpool_standard_error(hdl, error, msg);
	return (-1);
	}

	return (0);
	}

	/*
	* Discard the checkpoint from the given pool.
	*/
	int
	zpool_discard_checkpoint(zpool_handle_t *zhp)
	{
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	char msg[1024];
	int error;

	error = lzc_pool_checkpoint_discard(zhp->zpool_name);
	if (error != 0) {
	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot discard checkpoint in '%s'"), zhp->zpool_name);
	(void) zpool_standard_error(hdl, error, msg);
	return (-1);
	}

	return (0);
	}

	/*
	* Add the given vdevs to the pool. The caller must have already performed the
	* necessary verification to ensure that the vdev specification is well-formed.
	*/
	int
	zpool_add(zpool_handle_t zhp, nvlist_t nvroot)
	{
	zfs_cmd_t zc = {"\0"};
	int ret;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	char msg[1024];
	nvlist_t spares, l2cache;
	uint_t nspares, nl2cache;

	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot add to '%s'"), zhp->zpool_name);

	if (zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL) <
	SPA_VERSION_SPARES &&
	nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
	&spares, &nspares) == 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "pool must be "
	"upgraded to add hot spares"));
	return (zfs_error(hdl, EZFS_BADVERSION, msg));
	}

	if (zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL) <
	SPA_VERSION_L2CACHE &&
	nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
	&l2cache, &nl2cache) == 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "pool must be "
	"upgraded to add cache devices"));
	return (zfs_error(hdl, EZFS_BADVERSION, msg));
	}

	if (zcmd_write_conf_nvlist(hdl, &zc, nvroot) != 0)
	return (-1);
	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_ADD, &zc) != 0) {
	switch (errno) {
	case EBUSY:
	/*
	* This can happen if the user has specified the same
	* device multiple times. We can't reliably detect this
	* until we try to add it and see we already have a
	* label.
	*/
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"one or more vdevs refer to the same device"));
	(void) zfs_error(hdl, EZFS_BADDEV, msg);
	break;

	case EINVAL:

	if (zpool_has_draid_vdev(nvroot) &&
	zfeature_lookup_name("draid", NULL) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"dRAID vdevs are unsupported by the "
	"kernel"));
	} else {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"invalid config; a pool with removing/"
	"removed vdevs does not support adding "
	"raidz or dRAID vdevs"));
	}

	(void) zfs_error(hdl, EZFS_BADDEV, msg);
	break;

	case EOVERFLOW:
	/*
	* This occurs when one of the devices is below
	* SPA_MINDEVSIZE. Unfortunately, we can't detect which
	* device was the problem device since there's no
	* reliable way to determine device size from userland.
	*/
	{
	char buf[64];

	zfs_nicebytes(SPA_MINDEVSIZE, buf,
	sizeof (buf));

	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"device is less than the minimum "
	"size (%s)"), buf);
	}
	(void) zfs_error(hdl, EZFS_BADDEV, msg);
	break;

	case ENOTSUP:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"pool must be upgraded to add these vdevs"));
	(void) zfs_error(hdl, EZFS_BADVERSION, msg);
	break;

	default:
	(void) zpool_standard_error(hdl, errno, msg);
	}

	ret = -1;
	} else {
	ret = 0;
	}

	zcmd_free_nvlists(&zc);

	return (ret);
	}

	/*
	* Exports the pool from the system. The caller must ensure that there are no
	* mounted datasets in the pool.
	*/
	static int
	zpool_export_common(zpool_handle_t *zhp, boolean_t force, boolean_t hardforce,
	const char *log_str)
	{
	zfs_cmd_t zc = {"\0"};

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	zc.zc_cookie = force;
	zc.zc_guid = hardforce;
	zc.zc_history = (uint64_t)(uintptr_t)log_str;

	if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_POOL_EXPORT, &zc) != 0) {
	switch (errno) {
	case EXDEV:
	zfs_error_aux(zhp->zpool_hdl, dgettext(TEXT_DOMAIN,
	"use '-f' to override the following errors:\n"
	"'%s' has an active shared spare which could be"
	" used by other pools once '%s' is exported."),
	zhp->zpool_name, zhp->zpool_name);
	return (zfs_error_fmt(zhp->zpool_hdl, EZFS_ACTIVE_SPARE,
	dgettext(TEXT_DOMAIN, "cannot export '%s'"),
	zhp->zpool_name));
	default:
	return (zpool_standard_error_fmt(zhp->zpool_hdl, errno,
	dgettext(TEXT_DOMAIN, "cannot export '%s'"),
	zhp->zpool_name));
	}
	}

	return (0);
	}

	int
	zpool_export(zpool_handle_t zhp, boolean_t force, const char log_str)
	{
	return (zpool_export_common(zhp, force, B_FALSE, log_str));
	}

	int
	zpool_export_force(zpool_handle_t zhp, const char log_str)
	{
	return (zpool_export_common(zhp, B_TRUE, B_TRUE, log_str));
	}

	static void
	zpool_rewind_exclaim(libzfs_handle_t hdl, const char name, boolean_t dryrun,
	nvlist_t *config)
	{
	nvlist_t *nv = NULL;
	uint64_t rewindto;
	int64_t loss = -1;
	struct tm t;
	char timestr[128];

	if (!hdl->libzfs_printerr \|\| config == NULL)
	return;

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, &nv) != 0 \|\|
	nvlist_lookup_nvlist(nv, ZPOOL_CONFIG_REWIND_INFO, &nv) != 0) {
	return;
	}

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_LOAD_TIME, &rewindto) != 0)
	return;
	(void) nvlist_lookup_int64(nv, ZPOOL_CONFIG_REWIND_TIME, &loss);

	if (localtime_r((time_t *)&rewindto, &t) != NULL &&
	strftime(timestr, 128, "%c", &t) != 0) {
	if (dryrun) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"Would be able to return %s "
	"to its state as of %s.\n"),
	name, timestr);
	} else {
	(void) printf(dgettext(TEXT_DOMAIN,
	"Pool %s returned to its state as of %s.\n"),
	name, timestr);
	}
	if (loss > 120) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"%s approximately %lld "),
	dryrun ? "Would discard" : "Discarded",
	((longlong_t)loss + 30) / 60);
	(void) printf(dgettext(TEXT_DOMAIN,
	"minutes of transactions.\n"));
	} else if (loss > 0) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"%s approximately %lld "),
	dryrun ? "Would discard" : "Discarded",
	(longlong_t)loss);
	(void) printf(dgettext(TEXT_DOMAIN,
	"seconds of transactions.\n"));
	}
	}
	}

	void
	zpool_explain_recover(libzfs_handle_t hdl, const char name, int reason,
	nvlist_t *config)
	{
	nvlist_t *nv = NULL;
	int64_t loss = -1;
	uint64_t edata = UINT64_MAX;
	uint64_t rewindto;
	struct tm t;
	char timestr[128];

	if (!hdl->libzfs_printerr)
	return;

	if (reason >= 0)
	(void) printf(dgettext(TEXT_DOMAIN, "action: "));
	else
	(void) printf(dgettext(TEXT_DOMAIN, "\t"));

	/* All attempted rewinds failed if ZPOOL_CONFIG_LOAD_TIME missing */
	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, &nv) != 0 \|\|
	nvlist_lookup_nvlist(nv, ZPOOL_CONFIG_REWIND_INFO, &nv) != 0 \|\|
	nvlist_lookup_uint64(nv, ZPOOL_CONFIG_LOAD_TIME, &rewindto) != 0)
	goto no_info;

	(void) nvlist_lookup_int64(nv, ZPOOL_CONFIG_REWIND_TIME, &loss);
	(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_LOAD_DATA_ERRORS,
	&edata);

	(void) printf(dgettext(TEXT_DOMAIN,
	"Recovery is possible, but will result in some data loss.\n"));

	if (localtime_r((time_t *)&rewindto, &t) != NULL &&
	strftime(timestr, 128, "%c", &t) != 0) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"\tReturning the pool to its state as of %s\n"
	"\tshould correct the problem. "),
	timestr);
	} else {
	(void) printf(dgettext(TEXT_DOMAIN,
	"\tReverting the pool to an earlier state "
	"should correct the problem.\n\t"));
	}

	if (loss > 120) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"Approximately %lld minutes of data\n"
	"\tmust be discarded, irreversibly. "),
	((longlong_t)loss + 30) / 60);
	} else if (loss > 0) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"Approximately %lld seconds of data\n"
	"\tmust be discarded, irreversibly. "),
	(longlong_t)loss);
	}
	if (edata != 0 && edata != UINT64_MAX) {
	if (edata == 1) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"After rewind, at least\n"
	"\tone persistent user-data error will remain. "));
	} else {
	(void) printf(dgettext(TEXT_DOMAIN,
	"After rewind, several\n"
	"\tpersistent user-data errors will remain. "));
	}
	}
	(void) printf(dgettext(TEXT_DOMAIN,
	"Recovery can be attempted\n\tby executing 'zpool %s -F %s'. "),
	reason >= 0 ? "clear" : "import", name);

	(void) printf(dgettext(TEXT_DOMAIN,
	"A scrub of the pool\n"
	"\tis strongly recommended after recovery.\n"));
	return;

	no_info:
	(void) printf(dgettext(TEXT_DOMAIN,
	"Destroy and re-create the pool from\n\ta backup source.\n"));
	}

	/*
	* zpool_import() is a contracted interface. Should be kept the same
	* if possible.
	*
	* Applications should use zpool_import_props() to import a pool with
	* new properties value to be set.
	*/
	int
	zpool_import(libzfs_handle_t hdl, nvlist_t config, const char *newname,
	char *altroot)
	{
	nvlist_t *props = NULL;
	int ret;

	if (altroot != NULL) {
	if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
	return (zfs_error_fmt(hdl, EZFS_NOMEM,
	dgettext(TEXT_DOMAIN, "cannot import '%s'"),
	newname));
	}

	if (nvlist_add_string(props,
	zpool_prop_to_name(ZPOOL_PROP_ALTROOT), altroot) != 0 \|\|
	nvlist_add_string(props,
	zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), "none") != 0) {
	nvlist_free(props);
	return (zfs_error_fmt(hdl, EZFS_NOMEM,
	dgettext(TEXT_DOMAIN, "cannot import '%s'"),
	newname));
	}
	}

	ret = zpool_import_props(hdl, config, newname, props,
	ZFS_IMPORT_NORMAL);
	nvlist_free(props);
	return (ret);
	}

	static void
	print_vdev_tree(libzfs_handle_t hdl, const char name, nvlist_t *nv,
	int indent)
	{
	nvlist_t **child;
	uint_t c, children;
	char *vname;
	uint64_t is_log = 0;

	(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG,
	&is_log);

	if (name != NULL)
	(void) printf("\t%*s%s%s\n", indent, "", name,
	is_log ? " [log]" : "");

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	return;

	for (c = 0; c < children; c++) {
	vname = zpool_vdev_name(hdl, NULL, child[c], VDEV_NAME_TYPE_ID);
	print_vdev_tree(hdl, vname, child[c], indent + 2);
	free(vname);
	}
	}

	void
	zpool_print_unsup_feat(nvlist_t *config)
	{
	nvlist_t nvinfo, unsup_feat;
	nvpair_t *nvp;

	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, &nvinfo) ==
	0);
	verify(nvlist_lookup_nvlist(nvinfo, ZPOOL_CONFIG_UNSUP_FEAT,
	&unsup_feat) == 0);

	for (nvp = nvlist_next_nvpair(unsup_feat, NULL); nvp != NULL;
	nvp = nvlist_next_nvpair(unsup_feat, nvp)) {
	char *desc;

	verify(nvpair_type(nvp) == DATA_TYPE_STRING);
	verify(nvpair_value_string(nvp, &desc) == 0);

	if (strlen(desc) > 0)
	(void) printf("\t%s (%s)\n", nvpair_name(nvp), desc);
	else
	(void) printf("\t%s\n", nvpair_name(nvp));
	}
	}

	/*
	* Import the given pool using the known configuration and a list of
	* properties to be set. The configuration should have come from
	* zpool_find_import(). The 'newname' parameters control whether the pool
	* is imported with a different name.
	*/
	int
	zpool_import_props(libzfs_handle_t hdl, nvlist_t config, const char *newname,
	nvlist_t *props, int flags)
	{
	zfs_cmd_t zc = {"\0"};
	zpool_load_policy_t policy;
	nvlist_t *nv = NULL;
	nvlist_t *nvinfo = NULL;
	nvlist_t *missing = NULL;
	char *thename;
	char *origname;
	int ret;
	int error = 0;
	char errbuf[1024];

	verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
	&origname) == 0);

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot import pool '%s'"), origname);

	if (newname != NULL) {
	if (!zpool_name_valid(hdl, B_FALSE, newname))
	return (zfs_error_fmt(hdl, EZFS_INVALIDNAME,
	dgettext(TEXT_DOMAIN, "cannot import '%s'"),
	newname));
	thename = (char *)newname;
	} else {
	thename = origname;
	}

	if (props != NULL) {
	uint64_t version;
	prop_flags_t flags = { .create = B_FALSE, .import = B_TRUE };

	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
	&version) == 0);

	if ((props = zpool_valid_proplist(hdl, origname,
	props, version, flags, errbuf)) == NULL)
	return (-1);
	if (zcmd_write_src_nvlist(hdl, &zc, props) != 0) {
	nvlist_free(props);
	return (-1);
	}
	nvlist_free(props);
	}

	(void) strlcpy(zc.zc_name, thename, sizeof (zc.zc_name));

	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	&zc.zc_guid) == 0);

	if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0) {
	zcmd_free_nvlists(&zc);
	return (-1);
	}
	if (zcmd_alloc_dst_nvlist(hdl, &zc, zc.zc_nvlist_conf_size * 2) != 0) {
	zcmd_free_nvlists(&zc);
	return (-1);
	}

	zc.zc_cookie = flags;
	while ((ret = zfs_ioctl(hdl, ZFS_IOC_POOL_IMPORT, &zc)) != 0 &&
	errno == ENOMEM) {
	if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
	zcmd_free_nvlists(&zc);
	return (-1);
	}
	}
	if (ret != 0)
	error = errno;

	(void) zcmd_read_dst_nvlist(hdl, &zc, &nv);

	zcmd_free_nvlists(&zc);

	zpool_get_load_policy(config, &policy);

	if (error) {
	char desc[1024];
	char aux[256];

	/*
	* Dry-run failed, but we print out what success
	* looks like if we found a best txg
	*/
	if (policy.zlp_rewind & ZPOOL_TRY_REWIND) {
	zpool_rewind_exclaim(hdl, newname ? origname : thename,
	B_TRUE, nv);
	nvlist_free(nv);
	return (-1);
	}

	if (newname == NULL)
	(void) snprintf(desc, sizeof (desc),
	dgettext(TEXT_DOMAIN, "cannot import '%s'"),
	thename);
	else
	(void) snprintf(desc, sizeof (desc),
	dgettext(TEXT_DOMAIN, "cannot import '%s' as '%s'"),
	origname, thename);

	switch (error) {
	case ENOTSUP:
	if (nv != NULL && nvlist_lookup_nvlist(nv,
	ZPOOL_CONFIG_LOAD_INFO, &nvinfo) == 0 &&
	nvlist_exists(nvinfo, ZPOOL_CONFIG_UNSUP_FEAT)) {
	(void) printf(dgettext(TEXT_DOMAIN, "This "
	"pool uses the following feature(s) not "
	"supported by this system:\n"));
	zpool_print_unsup_feat(nv);
	if (nvlist_exists(nvinfo,
	ZPOOL_CONFIG_CAN_RDONLY)) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"All unsupported features are only "
	"required for writing to the pool."
	"\nThe pool can be imported using "
	"'-o readonly=on'.\n"));
	}
	}
	/*
	* Unsupported version.
	*/
	(void) zfs_error(hdl, EZFS_BADVERSION, desc);
	break;

	case EREMOTEIO:
	if (nv != NULL && nvlist_lookup_nvlist(nv,
	ZPOOL_CONFIG_LOAD_INFO, &nvinfo) == 0) {
	char *hostname = "<unknown>";
	uint64_t hostid = 0;
	mmp_state_t mmp_state;

	mmp_state = fnvlist_lookup_uint64(nvinfo,
	ZPOOL_CONFIG_MMP_STATE);

	if (nvlist_exists(nvinfo,
	ZPOOL_CONFIG_MMP_HOSTNAME))
	hostname = fnvlist_lookup_string(nvinfo,
	ZPOOL_CONFIG_MMP_HOSTNAME);

	if (nvlist_exists(nvinfo,
	ZPOOL_CONFIG_MMP_HOSTID))
	hostid = fnvlist_lookup_uint64(nvinfo,
	ZPOOL_CONFIG_MMP_HOSTID);

	if (mmp_state == MMP_STATE_ACTIVE) {
	(void) snprintf(aux, sizeof (aux),
	dgettext(TEXT_DOMAIN, "pool is imp"
	"orted on host '%s' (hostid=%lx).\n"
	"Export the pool on the other "
	"system, then run 'zpool import'."),
	hostname, (unsigned long) hostid);
	} else if (mmp_state == MMP_STATE_NO_HOSTID) {
	(void) snprintf(aux, sizeof (aux),
	dgettext(TEXT_DOMAIN, "pool has "
	"the multihost property on and "
	"the\nsystem's hostid is not set. "
	"Set a unique system hostid with "
	"the zgenhostid(8) command.\n"));
	}

	(void) zfs_error_aux(hdl, "%s", aux);
	}
	(void) zfs_error(hdl, EZFS_ACTIVE_POOL, desc);
	break;

	case EINVAL:
	(void) zfs_error(hdl, EZFS_INVALCONFIG, desc);
	break;

	case EROFS:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"one or more devices is read only"));
	(void) zfs_error(hdl, EZFS_BADDEV, desc);
	break;

	case ENXIO:
	if (nv && nvlist_lookup_nvlist(nv,
	ZPOOL_CONFIG_LOAD_INFO, &nvinfo) == 0 &&
	nvlist_lookup_nvlist(nvinfo,
	ZPOOL_CONFIG_MISSING_DEVICES, &missing) == 0) {
	(void) printf(dgettext(TEXT_DOMAIN,
	"The devices below are missing or "
	"corrupted, use '-m' to import the pool "
	"anyway:\n"));
	print_vdev_tree(hdl, NULL, missing, 2);
	(void) printf("\n");
	}
	(void) zpool_standard_error(hdl, error, desc);
	break;

	case EEXIST:
	(void) zpool_standard_error(hdl, error, desc);
	break;

	case EBUSY:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"one or more devices are already in use\n"));
	(void) zfs_error(hdl, EZFS_BADDEV, desc);
	break;
	case ENAMETOOLONG:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"new name of at least one dataset is longer than "
	"the maximum allowable length"));
	(void) zfs_error(hdl, EZFS_NAMETOOLONG, desc);
	break;
	default:
	(void) zpool_standard_error(hdl, error, desc);
	zpool_explain_recover(hdl,
	newname ? origname : thename, -error, nv);
	break;
	}

	nvlist_free(nv);
	ret = -1;
	} else {
	zpool_handle_t *zhp;

	/*
	* This should never fail, but play it safe anyway.
	*/
	if (zpool_open_silent(hdl, thename, &zhp) != 0)
	ret = -1;
	else if (zhp != NULL)
	zpool_close(zhp);
	if (policy.zlp_rewind &
	(ZPOOL_DO_REWIND \| ZPOOL_TRY_REWIND)) {
	zpool_rewind_exclaim(hdl, newname ? origname : thename,
	((policy.zlp_rewind & ZPOOL_TRY_REWIND) != 0), nv);
	}
	nvlist_free(nv);
	return (0);
	}

	return (ret);
	}

	/*
	* Translate vdev names to guids. If a vdev_path is determined to be
	* unsuitable then a vd_errlist is allocated and the vdev path and errno
	* are added to it.
	*/
	static int
	zpool_translate_vdev_guids(zpool_handle_t zhp, nvlist_t vds,
	nvlist_t vdev_guids, nvlist_t guids_to_paths, nvlist_t **vd_errlist)
	{
	nvlist_t *errlist = NULL;
	int error = 0;

	for (nvpair_t *elem = nvlist_next_nvpair(vds, NULL); elem != NULL;
	elem = nvlist_next_nvpair(vds, elem)) {
	boolean_t spare, cache;

	char *vd_path = nvpair_name(elem);
	nvlist_t *tgt = zpool_find_vdev(zhp, vd_path, &spare, &cache,
	NULL);

	if ((tgt == NULL) \|\| cache \|\| spare) {
	if (errlist == NULL) {
	errlist = fnvlist_alloc();
	error = EINVAL;
	}

	uint64_t err = (tgt == NULL) ? EZFS_NODEVICE :
	(spare ? EZFS_ISSPARE : EZFS_ISL2CACHE);
	fnvlist_add_int64(errlist, vd_path, err);
	continue;
	}

	uint64_t guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);
	fnvlist_add_uint64(vdev_guids, vd_path, guid);

	char msg[MAXNAMELEN];
	(void) snprintf(msg, sizeof (msg), "%llu", (u_longlong_t)guid);
	fnvlist_add_string(guids_to_paths, msg, vd_path);
	}

	if (error != 0) {
	verify(errlist != NULL);
	if (vd_errlist != NULL)
	*vd_errlist = errlist;
	else
	fnvlist_free(errlist);
	}

	return (error);
	}

	static int
	xlate_init_err(int err)
	{
	switch (err) {
	case ENODEV:
	return (EZFS_NODEVICE);
	case EINVAL:
	case EROFS:
	return (EZFS_BADDEV);
	case EBUSY:
	return (EZFS_INITIALIZING);
	case ESRCH:
	return (EZFS_NO_INITIALIZE);
	}
	return (err);
	}

	/*
	* Begin, suspend, or cancel the initialization (initializing of all free
	* blocks) for the given vdevs in the given pool.
	*/
	static int
	zpool_initialize_impl(zpool_handle_t *zhp, pool_initialize_func_t cmd_type,
	nvlist_t *vds, boolean_t wait)
	{
	int err;

	nvlist_t *vdev_guids = fnvlist_alloc();
	nvlist_t *guids_to_paths = fnvlist_alloc();
	nvlist_t *vd_errlist = NULL;
	nvlist_t *errlist;
	nvpair_t *elem;

	err = zpool_translate_vdev_guids(zhp, vds, vdev_guids,
	guids_to_paths, &vd_errlist);

	if (err != 0) {
	verify(vd_errlist != NULL);
	goto list_errors;
	}

	err = lzc_initialize(zhp->zpool_name, cmd_type,
	vdev_guids, &errlist);

	if (err != 0) {
	if (errlist != NULL) {
	vd_errlist = fnvlist_lookup_nvlist(errlist,
	ZPOOL_INITIALIZE_VDEVS);
	goto list_errors;
	}
	(void) zpool_standard_error(zhp->zpool_hdl, err,
	dgettext(TEXT_DOMAIN, "operation failed"));
	goto out;
	}

	if (wait) {
	for (elem = nvlist_next_nvpair(vdev_guids, NULL); elem != NULL;
	elem = nvlist_next_nvpair(vdev_guids, elem)) {

	uint64_t guid = fnvpair_value_uint64(elem);

	err = lzc_wait_tag(zhp->zpool_name,
	ZPOOL_WAIT_INITIALIZE, guid, NULL);
	if (err != 0) {
	(void) zpool_standard_error_fmt(zhp->zpool_hdl,
	err, dgettext(TEXT_DOMAIN, "error "
	"waiting for '%s' to initialize"),
	nvpair_name(elem));

	goto out;
	}
	}
	}
	goto out;

	list_errors:
	for (elem = nvlist_next_nvpair(vd_errlist, NULL); elem != NULL;
	elem = nvlist_next_nvpair(vd_errlist, elem)) {
	int64_t vd_error = xlate_init_err(fnvpair_value_int64(elem));
	char *path;

	if (nvlist_lookup_string(guids_to_paths, nvpair_name(elem),
	&path) != 0)
	path = nvpair_name(elem);

	(void) zfs_error_fmt(zhp->zpool_hdl, vd_error,
	"cannot initialize '%s'", path);
	}

	out:
	fnvlist_free(vdev_guids);
	fnvlist_free(guids_to_paths);

	if (vd_errlist != NULL)
	fnvlist_free(vd_errlist);

	return (err == 0 ? 0 : -1);
	}

	int
	zpool_initialize(zpool_handle_t *zhp, pool_initialize_func_t cmd_type,
	nvlist_t *vds)
	{
	return (zpool_initialize_impl(zhp, cmd_type, vds, B_FALSE));
	}

	int
	zpool_initialize_wait(zpool_handle_t *zhp, pool_initialize_func_t cmd_type,
	nvlist_t *vds)
	{
	return (zpool_initialize_impl(zhp, cmd_type, vds, B_TRUE));
	}

	static int
	xlate_trim_err(int err)
	{
	switch (err) {
	case ENODEV:
	return (EZFS_NODEVICE);
	case EINVAL:
	case EROFS:
	return (EZFS_BADDEV);
	case EBUSY:
	return (EZFS_TRIMMING);
	case ESRCH:
	return (EZFS_NO_TRIM);
	case EOPNOTSUPP:
	return (EZFS_TRIM_NOTSUP);
	}
	return (err);
	}

	static int
	zpool_trim_wait(zpool_handle_t zhp, nvlist_t vdev_guids)
	{
	int err;
	nvpair_t *elem;

	for (elem = nvlist_next_nvpair(vdev_guids, NULL); elem != NULL;
	elem = nvlist_next_nvpair(vdev_guids, elem)) {

	uint64_t guid = fnvpair_value_uint64(elem);

	err = lzc_wait_tag(zhp->zpool_name,
	ZPOOL_WAIT_TRIM, guid, NULL);
	if (err != 0) {
	(void) zpool_standard_error_fmt(zhp->zpool_hdl,
	err, dgettext(TEXT_DOMAIN, "error "
	"waiting to trim '%s'"), nvpair_name(elem));

	return (err);
	}
	}
	return (0);
	}

	/*
	* Check errlist and report any errors, omitting ones which should be
	* suppressed. Returns B_TRUE if any errors were reported.
	*/
	static boolean_t
	check_trim_errs(zpool_handle_t zhp, trimflags_t trim_flags,
	nvlist_t guids_to_paths, nvlist_t vds, nvlist_t *errlist)
	{
	nvpair_t *elem;
	boolean_t reported_errs = B_FALSE;
	int num_vds = 0;
	int num_suppressed_errs = 0;

	for (elem = nvlist_next_nvpair(vds, NULL);
	elem != NULL; elem = nvlist_next_nvpair(vds, elem)) {
	num_vds++;
	}

	for (elem = nvlist_next_nvpair(errlist, NULL);
	elem != NULL; elem = nvlist_next_nvpair(errlist, elem)) {
	int64_t vd_error = xlate_trim_err(fnvpair_value_int64(elem));
	char *path;

	/*
	* If only the pool was specified, and it was not a secure
	* trim then suppress warnings for individual vdevs which
	* do not support trimming.
	*/
	if (vd_error == EZFS_TRIM_NOTSUP &&
	trim_flags->fullpool &&
	!trim_flags->secure) {
	num_suppressed_errs++;
	continue;
	}

	reported_errs = B_TRUE;
	if (nvlist_lookup_string(guids_to_paths, nvpair_name(elem),
	&path) != 0)
	path = nvpair_name(elem);

	(void) zfs_error_fmt(zhp->zpool_hdl, vd_error,
	"cannot trim '%s'", path);
	}

	if (num_suppressed_errs == num_vds) {
	(void) zfs_error_aux(zhp->zpool_hdl, dgettext(TEXT_DOMAIN,
	"no devices in pool support trim operations"));
	(void) (zfs_error(zhp->zpool_hdl, EZFS_TRIM_NOTSUP,
	dgettext(TEXT_DOMAIN, "cannot trim")));
	reported_errs = B_TRUE;
	}

	return (reported_errs);
	}

	/*
	* Begin, suspend, or cancel the TRIM (discarding of all free blocks) for
	* the given vdevs in the given pool.
	*/
	int
	zpool_trim(zpool_handle_t zhp, pool_trim_func_t cmd_type, nvlist_t vds,
	trimflags_t *trim_flags)
	{
	int err;
	int retval = 0;

	nvlist_t *vdev_guids = fnvlist_alloc();
	nvlist_t *guids_to_paths = fnvlist_alloc();
	nvlist_t *errlist = NULL;

	err = zpool_translate_vdev_guids(zhp, vds, vdev_guids,
	guids_to_paths, &errlist);
	if (err != 0) {
	check_trim_errs(zhp, trim_flags, guids_to_paths, vds, errlist);
	retval = -1;
	goto out;
	}

	err = lzc_trim(zhp->zpool_name, cmd_type, trim_flags->rate,
	trim_flags->secure, vdev_guids, &errlist);
	if (err != 0) {
	nvlist_t *vd_errlist;
	if (errlist != NULL && nvlist_lookup_nvlist(errlist,
	ZPOOL_TRIM_VDEVS, &vd_errlist) == 0) {
	if (check_trim_errs(zhp, trim_flags, guids_to_paths,
	vds, vd_errlist)) {
	retval = -1;
	goto out;
	}
	} else {
	char msg[1024];

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "operation failed"));
	zpool_standard_error(zhp->zpool_hdl, err, msg);
	retval = -1;
	goto out;
	}
	}


	if (trim_flags->wait)
	retval = zpool_trim_wait(zhp, vdev_guids);

	out:
	if (errlist != NULL)
	fnvlist_free(errlist);
	fnvlist_free(vdev_guids);
	fnvlist_free(guids_to_paths);
	return (retval);
	}

	/*
	* Scan the pool.
	*/
	int
	zpool_scan(zpool_handle_t *zhp, pool_scan_func_t func, pool_scrub_cmd_t cmd)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	int err;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	zc.zc_cookie = func;
	zc.zc_flags = cmd;

	if (zfs_ioctl(hdl, ZFS_IOC_POOL_SCAN, &zc) == 0)
	return (0);

	err = errno;

	/* ECANCELED on a scrub means we resumed a paused scrub */
	if (err == ECANCELED && func == POOL_SCAN_SCRUB &&
	cmd == POOL_SCRUB_NORMAL)
	return (0);

	if (err == ENOENT && func != POOL_SCAN_NONE && cmd == POOL_SCRUB_NORMAL)
	return (0);

	if (func == POOL_SCAN_SCRUB) {
	if (cmd == POOL_SCRUB_PAUSE) {
	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot pause scrubbing %s"), zc.zc_name);
	} else {
	assert(cmd == POOL_SCRUB_NORMAL);
	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot scrub %s"), zc.zc_name);
	}
	} else if (func == POOL_SCAN_RESILVER) {
	assert(cmd == POOL_SCRUB_NORMAL);
	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot restart resilver on %s"), zc.zc_name);
	} else if (func == POOL_SCAN_NONE) {
	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot cancel scrubbing %s"),
	zc.zc_name);
	} else {
	assert(!"unexpected result");
	}

	if (err == EBUSY) {
	nvlist_t *nvroot;
	pool_scan_stat_t *ps = NULL;
	uint_t psc;

	verify(nvlist_lookup_nvlist(zhp->zpool_config,
	ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
	(void) nvlist_lookup_uint64_array(nvroot,
	ZPOOL_CONFIG_SCAN_STATS, (uint64_t **)&ps, &psc);
	if (ps && ps->pss_func == POOL_SCAN_SCRUB &&
	ps->pss_state == DSS_SCANNING) {
	if (cmd == POOL_SCRUB_PAUSE)
	return (zfs_error(hdl, EZFS_SCRUB_PAUSED, msg));
	else
	return (zfs_error(hdl, EZFS_SCRUBBING, msg));
	} else {
	return (zfs_error(hdl, EZFS_RESILVERING, msg));
	}
	} else if (err == ENOENT) {
	return (zfs_error(hdl, EZFS_NO_SCRUB, msg));
	} else if (err == ENOTSUP && func == POOL_SCAN_RESILVER) {
	return (zfs_error(hdl, EZFS_NO_RESILVER_DEFER, msg));
	} else {
	return (zpool_standard_error(hdl, err, msg));
	}
	}

	/*
	* Find a vdev that matches the search criteria specified. We use the
	* the nvpair name to determine how we should look for the device.
	* 'avail_spare' is set to TRUE if the provided guid refers to an AVAIL
	* spare; but FALSE if its an INUSE spare.
	*/
	static nvlist_t *
	vdev_to_nvlist_iter(nvlist_t nv, nvlist_t search, boolean_t *avail_spare,
	boolean_t l2cache, boolean_t log)
	{
	uint_t c, children;
	nvlist_t **child;
	nvlist_t *ret;
	uint64_t is_log;
	char *srchkey;
	nvpair_t *pair = nvlist_next_nvpair(search, NULL);

	/* Nothing to look for */
	if (search == NULL \|\| pair == NULL)
	return (NULL);

	/* Obtain the key we will use to search */
	srchkey = nvpair_name(pair);

	switch (nvpair_type(pair)) {
	case DATA_TYPE_UINT64:
	if (strcmp(srchkey, ZPOOL_CONFIG_GUID) == 0) {
	uint64_t srchval, theguid;

	verify(nvpair_value_uint64(pair, &srchval) == 0);
	verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID,
	&theguid) == 0);
	if (theguid == srchval)
	return (nv);
	}
	break;

	case DATA_TYPE_STRING: {
	char srchval, val;

	verify(nvpair_value_string(pair, &srchval) == 0);
	if (nvlist_lookup_string(nv, srchkey, &val) != 0)
	break;

	/*
	* Search for the requested value. Special cases:
	*
	* - ZPOOL_CONFIG_PATH for whole disk entries. These end in
	* "-part1", or "p1". The suffix is hidden from the user,
	* but included in the string, so this matches around it.
	* - ZPOOL_CONFIG_PATH for short names zfs_strcmp_shortname()
	* is used to check all possible expanded paths.
	* - looking for a top-level vdev name (i.e. ZPOOL_CONFIG_TYPE).
	*
	* Otherwise, all other searches are simple string compares.
	*/
	if (strcmp(srchkey, ZPOOL_CONFIG_PATH) == 0) {
	uint64_t wholedisk = 0;

	(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
	&wholedisk);
	if (zfs_strcmp_pathname(srchval, val, wholedisk) == 0)
	return (nv);

	} else if (strcmp(srchkey, ZPOOL_CONFIG_TYPE) == 0 && val) {
	char type, idx, end, p;
	uint64_t id, vdev_id;

	/*
	* Determine our vdev type, keeping in mind
	* that the srchval is composed of a type and
	* vdev id pair (i.e. mirror-4).
	*/
	if ((type = strdup(srchval)) == NULL)
	return (NULL);

	if ((p = strrchr(type, '-')) == NULL) {
	free(type);
	break;
	}
	idx = p + 1;
	*p = '\0';

	/*
	* If the types don't match then keep looking.
	*/
	if (strncmp(val, type, strlen(val)) != 0) {
	free(type);
	break;
	}

	verify(zpool_vdev_is_interior(type));
	verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID,
	&id) == 0);

	errno = 0;
	vdev_id = strtoull(idx, &end, 10);

	/*
	* If we are looking for a raidz and a parity is
	* specified, make sure it matches.
	*/
	int rzlen = strlen(VDEV_TYPE_RAIDZ);
	assert(rzlen == strlen(VDEV_TYPE_DRAID));
	int typlen = strlen(type);
	if ((strncmp(type, VDEV_TYPE_RAIDZ, rzlen) == 0 \|\|
	strncmp(type, VDEV_TYPE_DRAID, rzlen) == 0) &&
	typlen != rzlen) {
	uint64_t vdev_parity;
	int parity = *(type + rzlen) - '0';

	if (parity <= 0 \|\| parity > 3 \|\|
	(typlen - rzlen) != 1) {
	/*
	* Nonsense parity specified, can
	* never match
	*/
	free(type);
	return (NULL);
	}
	verify(nvlist_lookup_uint64(nv,
	ZPOOL_CONFIG_NPARITY, &vdev_parity) == 0);
	if ((int)vdev_parity != parity) {
	free(type);
	break;
	}
	}

	free(type);
	if (errno != 0)
	return (NULL);

	/*
	* Now verify that we have the correct vdev id.
	*/
	if (vdev_id == id)
	return (nv);
	}

	/*
	* Common case
	*/
	if (strcmp(srchval, val) == 0)
	return (nv);
	break;
	}

	default:
	break;
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0)
	return (NULL);

	for (c = 0; c < children; c++) {
	if ((ret = vdev_to_nvlist_iter(child[c], search,
	avail_spare, l2cache, NULL)) != NULL) {
	/*
	* The 'is_log' value is only set for the toplevel
	* vdev, not the leaf vdevs. So we always lookup the
	* log device from the root of the vdev tree (where
	* 'log' is non-NULL).
	*/
	if (log != NULL &&
	nvlist_lookup_uint64(child[c],
	ZPOOL_CONFIG_IS_LOG, &is_log) == 0 &&
	is_log) {
	*log = B_TRUE;
	}
	return (ret);
	}
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
	&child, &children) == 0) {
	for (c = 0; c < children; c++) {
	if ((ret = vdev_to_nvlist_iter(child[c], search,
	avail_spare, l2cache, NULL)) != NULL) {
	*avail_spare = B_TRUE;
	return (ret);
	}
	}
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
	&child, &children) == 0) {
	for (c = 0; c < children; c++) {
	if ((ret = vdev_to_nvlist_iter(child[c], search,
	avail_spare, l2cache, NULL)) != NULL) {
	*l2cache = B_TRUE;
	return (ret);
	}
	}
	}

	return (NULL);
	}

	/*
	* Given a physical path or guid, find the associated vdev.
	*/
	nvlist_t *
	zpool_find_vdev_by_physpath(zpool_handle_t zhp, const char ppath,
	boolean_t avail_spare, boolean_t l2cache, boolean_t *log)
	{
	nvlist_t search, nvroot, *ret;
	uint64_t guid;
	char *end;

	verify(nvlist_alloc(&search, NV_UNIQUE_NAME, KM_SLEEP) == 0);

	guid = strtoull(ppath, &end, 0);
	if (guid != 0 && *end == '\0') {
	verify(nvlist_add_uint64(search, ZPOOL_CONFIG_GUID, guid) == 0);
	} else {
	verify(nvlist_add_string(search, ZPOOL_CONFIG_PHYS_PATH,
	ppath) == 0);
	}

	verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE,
	&nvroot) == 0);

	*avail_spare = B_FALSE;
	*l2cache = B_FALSE;
	if (log != NULL)
	*log = B_FALSE;
	ret = vdev_to_nvlist_iter(nvroot, search, avail_spare, l2cache, log);
	nvlist_free(search);

	return (ret);
	}

	/*
	* Determine if we have an "interior" top-level vdev (i.e mirror/raidz).
	*/
	static boolean_t
	zpool_vdev_is_interior(const char *name)
	{
	if (strncmp(name, VDEV_TYPE_RAIDZ, strlen(VDEV_TYPE_RAIDZ)) == 0 \|\|
	strncmp(name, VDEV_TYPE_SPARE, strlen(VDEV_TYPE_SPARE)) == 0 \|\|
	strncmp(name,
	VDEV_TYPE_REPLACING, strlen(VDEV_TYPE_REPLACING)) == 0 \|\|
	strncmp(name, VDEV_TYPE_MIRROR, strlen(VDEV_TYPE_MIRROR)) == 0)
	return (B_TRUE);

	if (strncmp(name, VDEV_TYPE_DRAID, strlen(VDEV_TYPE_DRAID)) == 0 &&
	!zpool_is_draid_spare(name))
	return (B_TRUE);

	return (B_FALSE);
	}

	nvlist_t *
	zpool_find_vdev(zpool_handle_t zhp, const char path, boolean_t *avail_spare,
	boolean_t l2cache, boolean_t log)
	{
	char *end;
	nvlist_t nvroot, search, *ret;
	uint64_t guid;

	verify(nvlist_alloc(&search, NV_UNIQUE_NAME, KM_SLEEP) == 0);

	guid = strtoull(path, &end, 0);
	if (guid != 0 && *end == '\0') {
	verify(nvlist_add_uint64(search, ZPOOL_CONFIG_GUID, guid) == 0);
	} else if (zpool_vdev_is_interior(path)) {
	verify(nvlist_add_string(search, ZPOOL_CONFIG_TYPE, path) == 0);
	} else {
	verify(nvlist_add_string(search, ZPOOL_CONFIG_PATH, path) == 0);
	}

	verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE,
	&nvroot) == 0);

	*avail_spare = B_FALSE;
	*l2cache = B_FALSE;
	if (log != NULL)
	*log = B_FALSE;
	ret = vdev_to_nvlist_iter(nvroot, search, avail_spare, l2cache, log);
	nvlist_free(search);

	return (ret);
	}

	static int
	vdev_is_online(nvlist_t *nv)
	{
	uint64_t ival;

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, &ival) == 0 \|\|
	nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, &ival) == 0 \|\|
	nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, &ival) == 0)
	return (0);

	return (1);
	}

	/*
	* Helper function for zpool_get_physpaths().
	*/
	static int
	vdev_get_one_physpath(nvlist_t config, char physpath, size_t physpath_size,
	size_t *bytes_written)
	{
	size_t bytes_left, pos, rsz;
	char *tmppath;
	const char *format;

	if (nvlist_lookup_string(config, ZPOOL_CONFIG_PHYS_PATH,
	&tmppath) != 0)
	return (EZFS_NODEVICE);

	pos = *bytes_written;
	bytes_left = physpath_size - pos;
	format = (pos == 0) ? "%s" : " %s";

	rsz = snprintf(physpath + pos, bytes_left, format, tmppath);
	*bytes_written += rsz;

	if (rsz >= bytes_left) {
	/* if physpath was not copied properly, clear it */
	if (bytes_left != 0) {
	physpath[pos] = 0;
	}
	return (EZFS_NOSPC);
	}
	return (0);
	}

	static int
	vdev_get_physpaths(nvlist_t nv, char physpath, size_t phypath_size,
	size_t *rsz, boolean_t is_spare)
	{
	char *type;
	int ret;

	if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0)
	return (EZFS_INVALCONFIG);

	if (strcmp(type, VDEV_TYPE_DISK) == 0) {
	/*
	* An active spare device has ZPOOL_CONFIG_IS_SPARE set.
	* For a spare vdev, we only want to boot from the active
	* spare device.
	*/
	if (is_spare) {
	uint64_t spare = 0;
	(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE,
	&spare);
	if (!spare)
	return (EZFS_INVALCONFIG);
	}

	if (vdev_is_online(nv)) {
	if ((ret = vdev_get_one_physpath(nv, physpath,
	phypath_size, rsz)) != 0)
	return (ret);
	}
	} else if (strcmp(type, VDEV_TYPE_MIRROR) == 0 \|\|
	strcmp(type, VDEV_TYPE_RAIDZ) == 0 \|\|
	strcmp(type, VDEV_TYPE_REPLACING) == 0 \|\|
	(is_spare = (strcmp(type, VDEV_TYPE_SPARE) == 0))) {
	nvlist_t **child;
	uint_t count;
	int i, ret;

	if (nvlist_lookup_nvlist_array(nv,
	ZPOOL_CONFIG_CHILDREN, &child, &count) != 0)
	return (EZFS_INVALCONFIG);

	for (i = 0; i < count; i++) {
	ret = vdev_get_physpaths(child[i], physpath,
	phypath_size, rsz, is_spare);
	if (ret == EZFS_NOSPC)
	return (ret);
	}
	}

	return (EZFS_POOL_INVALARG);
	}

	/*
	* Get phys_path for a root pool config.
	* Return 0 on success; non-zero on failure.
	*/
	static int
	zpool_get_config_physpath(nvlist_t config, char physpath, size_t phypath_size)
	{
	size_t rsz;
	nvlist_t *vdev_root;
	nvlist_t **child;
	uint_t count;
	char *type;

	rsz = 0;

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	&vdev_root) != 0)
	return (EZFS_INVALCONFIG);

	if (nvlist_lookup_string(vdev_root, ZPOOL_CONFIG_TYPE, &type) != 0 \|\|
	nvlist_lookup_nvlist_array(vdev_root, ZPOOL_CONFIG_CHILDREN,
	&child, &count) != 0)
	return (EZFS_INVALCONFIG);

	/*
	* root pool can only have a single top-level vdev.
	*/
	if (strcmp(type, VDEV_TYPE_ROOT) != 0 \|\| count != 1)
	return (EZFS_POOL_INVALARG);

	(void) vdev_get_physpaths(child[0], physpath, phypath_size, &rsz,
	B_FALSE);

	/* No online devices */
	if (rsz == 0)
	return (EZFS_NODEVICE);

	return (0);
	}

	/*
	* Get phys_path for a root pool
	* Return 0 on success; non-zero on failure.
	*/
	int
	zpool_get_physpath(zpool_handle_t zhp, char physpath, size_t phypath_size)
	{
	return (zpool_get_config_physpath(zhp->zpool_config, physpath,
	phypath_size));
	}

	/*
	* Convert a vdev path to a GUID. Returns GUID or 0 on error.
	*
	* If is_spare, is_l2cache, or is_log is non-NULL, then store within it
	* if the VDEV is a spare, l2cache, or log device. If they're NULL then
	* ignore them.
	*/
	static uint64_t
	zpool_vdev_path_to_guid_impl(zpool_handle_t zhp, const char path,
	boolean_t is_spare, boolean_t is_l2cache, boolean_t *is_log)
	{
	uint64_t guid;
	boolean_t spare = B_FALSE, l2cache = B_FALSE, log = B_FALSE;
	nvlist_t *tgt;

	if ((tgt = zpool_find_vdev(zhp, path, &spare, &l2cache,
	&log)) == NULL)
	return (0);

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &guid) == 0);
	if (is_spare != NULL)
	*is_spare = spare;
	if (is_l2cache != NULL)
	*is_l2cache = l2cache;
	if (is_log != NULL)
	*is_log = log;

	return (guid);
	}

	/* Convert a vdev path to a GUID. Returns GUID or 0 on error. */
	uint64_t
	zpool_vdev_path_to_guid(zpool_handle_t zhp, const char path)
	{
	return (zpool_vdev_path_to_guid_impl(zhp, path, NULL, NULL, NULL));
	}

	/*
	* Bring the specified vdev online. The 'flags' parameter is a set of the
	* ZFS_ONLINE_* flags.
	*/
	int
	zpool_vdev_online(zpool_handle_t zhp, const char path, int flags,
	vdev_state_t *newstate)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	char *pathname;
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache, islog;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	int error;

	if (flags & ZFS_ONLINE_EXPAND) {
	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot expand %s"), path);
	} else {
	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot online %s"), path);
	}

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
	&islog)) == NULL)
	return (zfs_error(hdl, EZFS_NODEVICE, msg));

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);

	if (avail_spare)
	return (zfs_error(hdl, EZFS_ISSPARE, msg));

	if ((flags & ZFS_ONLINE_EXPAND \|\|
	zpool_get_prop_int(zhp, ZPOOL_PROP_AUTOEXPAND, NULL)) &&
	nvlist_lookup_string(tgt, ZPOOL_CONFIG_PATH, &pathname) == 0) {
	uint64_t wholedisk = 0;

	(void) nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_WHOLE_DISK,
	&wholedisk);

	/*
	* XXX - L2ARC 1.0 devices can't support expansion.
	*/
	if (l2cache) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"cannot expand cache devices"));
	return (zfs_error(hdl, EZFS_VDEVNOTSUP, msg));
	}

	if (wholedisk) {
	const char *fullpath = path;
	char buf[MAXPATHLEN];

	if (path[0] != '/') {
	error = zfs_resolve_shortname(path, buf,
	sizeof (buf));
	if (error != 0)
	return (zfs_error(hdl, EZFS_NODEVICE,
	msg));

	fullpath = buf;
	}

	error = zpool_relabel_disk(hdl, fullpath, msg);
	if (error != 0)
	return (error);
	}
	}

	zc.zc_cookie = VDEV_STATE_ONLINE;
	zc.zc_obj = flags;

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) != 0) {
	if (errno == EINVAL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "was split "
	"from this pool into a new one. Use '%s' "
	"instead"), "zpool detach");
	return (zfs_error(hdl, EZFS_POSTSPLIT_ONLINE, msg));
	}
	return (zpool_standard_error(hdl, errno, msg));
	}

	*newstate = zc.zc_cookie;
	return (0);
	}

	/*
	* Take the specified vdev offline
	*/
	int
	zpool_vdev_offline(zpool_handle_t zhp, const char path, boolean_t istmp)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot offline %s"), path);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
	NULL)) == NULL)
	return (zfs_error(hdl, EZFS_NODEVICE, msg));

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);

	if (avail_spare)
	return (zfs_error(hdl, EZFS_ISSPARE, msg));

	zc.zc_cookie = VDEV_STATE_OFFLINE;
	zc.zc_obj = istmp ? ZFS_OFFLINE_TEMPORARY : 0;

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) == 0)
	return (0);

	switch (errno) {
	case EBUSY:

	/*
	* There are no other replicas of this device.
	*/
	return (zfs_error(hdl, EZFS_NOREPLICAS, msg));

	case EEXIST:
	/*
	* The log device has unplayed logs
	*/
	return (zfs_error(hdl, EZFS_UNPLAYED_LOGS, msg));

	default:
	return (zpool_standard_error(hdl, errno, msg));
	}
	}

	/*
	* Mark the given vdev faulted.
	*/
	int
	zpool_vdev_fault(zpool_handle_t *zhp, uint64_t guid, vdev_aux_t aux)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot fault %llu"), (u_longlong_t)guid);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	zc.zc_guid = guid;
	zc.zc_cookie = VDEV_STATE_FAULTED;
	zc.zc_obj = aux;

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) == 0)
	return (0);

	switch (errno) {
	case EBUSY:

	/*
	* There are no other replicas of this device.
	*/
	return (zfs_error(hdl, EZFS_NOREPLICAS, msg));

	default:
	return (zpool_standard_error(hdl, errno, msg));
	}

	}

	/*
	* Mark the given vdev degraded.
	*/
	int
	zpool_vdev_degrade(zpool_handle_t *zhp, uint64_t guid, vdev_aux_t aux)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot degrade %llu"), (u_longlong_t)guid);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	zc.zc_guid = guid;
	zc.zc_cookie = VDEV_STATE_DEGRADED;
	zc.zc_obj = aux;

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) == 0)
	return (0);

	return (zpool_standard_error(hdl, errno, msg));
	}

	/*
	* Returns TRUE if the given nvlist is a vdev that was originally swapped in as
	* a hot spare.
	*/
	static boolean_t
	is_replacing_spare(nvlist_t search, nvlist_t tgt, int which)
	{
	nvlist_t **child;
	uint_t c, children;
	char *type;

	if (nvlist_lookup_nvlist_array(search, ZPOOL_CONFIG_CHILDREN, &child,
	&children) == 0) {
	verify(nvlist_lookup_string(search, ZPOOL_CONFIG_TYPE,
	&type) == 0);

	if ((strcmp(type, VDEV_TYPE_SPARE) == 0 \|\|
	strcmp(type, VDEV_TYPE_DRAID_SPARE) == 0) &&
	children == 2 && child[which] == tgt)
	return (B_TRUE);

	for (c = 0; c < children; c++)
	if (is_replacing_spare(child[c], tgt, which))
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	/*
	* Attach new_disk (fully described by nvroot) to old_disk.
	* If 'replacing' is specified, the new disk will replace the old one.
	*/
	int
	zpool_vdev_attach(zpool_handle_t zhp, const char old_disk,
	const char new_disk, nvlist_t nvroot, int replacing, boolean_t rebuild)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	int ret;
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache, islog;
	uint64_t val;
	char *newname;
	nvlist_t **child;
	uint_t children;
	nvlist_t *config_root;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	if (replacing)
	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot replace %s with %s"), old_disk, new_disk);
	else
	(void) snprintf(msg, sizeof (msg), dgettext(TEXT_DOMAIN,
	"cannot attach %s to %s"), new_disk, old_disk);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	if ((tgt = zpool_find_vdev(zhp, old_disk, &avail_spare, &l2cache,
	&islog)) == NULL)
	return (zfs_error(hdl, EZFS_NODEVICE, msg));

	if (avail_spare)
	return (zfs_error(hdl, EZFS_ISSPARE, msg));

	if (l2cache)
	return (zfs_error(hdl, EZFS_ISL2CACHE, msg));

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);
	zc.zc_cookie = replacing;
	zc.zc_simple = rebuild;

	if (rebuild &&
	zfeature_lookup_guid("org.openzfs:device_rebuild", NULL) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"the loaded zfs module doesn't support device rebuilds"));
	return (zfs_error(hdl, EZFS_POOL_NOTSUP, msg));
	}

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	&child, &children) != 0 \|\| children != 1) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"new device must be a single disk"));
	return (zfs_error(hdl, EZFS_INVALCONFIG, msg));
	}

	verify(nvlist_lookup_nvlist(zpool_get_config(zhp, NULL),
	ZPOOL_CONFIG_VDEV_TREE, &config_root) == 0);

	if ((newname = zpool_vdev_name(NULL, NULL, child[0], 0)) == NULL)
	return (-1);

	/*
	* If the target is a hot spare that has been swapped in, we can only
	* replace it with another hot spare.
	*/
	if (replacing &&
	nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_IS_SPARE, &val) == 0 &&
	(zpool_find_vdev(zhp, newname, &avail_spare, &l2cache,
	NULL) == NULL \|\| !avail_spare) &&
	is_replacing_spare(config_root, tgt, 1)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"can only be replaced by another hot spare"));
	free(newname);
	return (zfs_error(hdl, EZFS_BADTARGET, msg));
	}

	free(newname);

	if (zcmd_write_conf_nvlist(hdl, &zc, nvroot) != 0)
	return (-1);

	ret = zfs_ioctl(hdl, ZFS_IOC_VDEV_ATTACH, &zc);

	zcmd_free_nvlists(&zc);

	if (ret == 0)
	return (0);

	switch (errno) {
	case ENOTSUP:
	/*
	* Can't attach to or replace this type of vdev.
	*/
	if (replacing) {
	uint64_t version = zpool_get_prop_int(zhp,
	ZPOOL_PROP_VERSION, NULL);

	if (islog) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"cannot replace a log with a spare"));
	} else if (rebuild) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"only mirror and dRAID vdevs support "
	"sequential reconstruction"));
	} else if (zpool_is_draid_spare(new_disk)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"dRAID spares can only replace child "
	"devices in their parent's dRAID vdev"));
	} else if (version >= SPA_VERSION_MULTI_REPLACE) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"already in replacing/spare config; wait "
	"for completion or use 'zpool detach'"));
	} else {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"cannot replace a replacing device"));
	}
	} else {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"can only attach to mirrors and top-level "
	"disks"));
	}
	(void) zfs_error(hdl, EZFS_BADTARGET, msg);
	break;

	case EINVAL:
	/*
	* The new device must be a single disk.
	*/
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"new device must be a single disk"));
	(void) zfs_error(hdl, EZFS_INVALCONFIG, msg);
	break;

	case EBUSY:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "%s is busy, "
	"or device removal is in progress"),
	new_disk);
	(void) zfs_error(hdl, EZFS_BADDEV, msg);
	break;

	case EOVERFLOW:
	/*
	* The new device is too small.
	*/
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"device is too small"));
	(void) zfs_error(hdl, EZFS_BADDEV, msg);
	break;

	case EDOM:
	/*
	* The new device has a different optimal sector size.
	*/
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"new device has a different optimal sector size; use the "
	"option '-o ashift=N' to override the optimal size"));
	(void) zfs_error(hdl, EZFS_BADDEV, msg);
	break;

	case ENAMETOOLONG:
	/*
	* The resulting top-level vdev spec won't fit in the label.
	*/
	(void) zfs_error(hdl, EZFS_DEVOVERFLOW, msg);
	break;

	default:
	(void) zpool_standard_error(hdl, errno, msg);
	}

	return (-1);
	}

	/*
	* Detach the specified device.
	*/
	int
	zpool_vdev_detach(zpool_handle_t zhp, const char path)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot detach %s"), path);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
	NULL)) == NULL)
	return (zfs_error(hdl, EZFS_NODEVICE, msg));

	if (avail_spare)
	return (zfs_error(hdl, EZFS_ISSPARE, msg));

	if (l2cache)
	return (zfs_error(hdl, EZFS_ISL2CACHE, msg));

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_DETACH, &zc) == 0)
	return (0);

	switch (errno) {

	case ENOTSUP:
	/*
	* Can't detach from this type of vdev.
	*/
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "only "
	"applicable to mirror and replacing vdevs"));
	(void) zfs_error(hdl, EZFS_BADTARGET, msg);
	break;

	case EBUSY:
	/*
	* There are no other replicas of this device.
	*/
	(void) zfs_error(hdl, EZFS_NOREPLICAS, msg);
	break;

	default:
	(void) zpool_standard_error(hdl, errno, msg);
	}

	return (-1);
	}

	/*
	* Find a mirror vdev in the source nvlist.
	*
	* The mchild array contains a list of disks in one of the top-level mirrors
	* of the source pool. The schild array contains a list of disks that the
	* user specified on the command line. We loop over the mchild array to
	* see if any entry in the schild array matches.
	*
	* If a disk in the mchild array is found in the schild array, we return
	* the index of that entry. Otherwise we return -1.
	*/
	static int
	find_vdev_entry(zpool_handle_t zhp, nvlist_t *mchild, uint_t mchildren,
	nvlist_t **schild, uint_t schildren)
	{
	uint_t mc;

	for (mc = 0; mc < mchildren; mc++) {
	uint_t sc;
	char *mpath = zpool_vdev_name(zhp->zpool_hdl, zhp,
	mchild[mc], 0);

	for (sc = 0; sc < schildren; sc++) {
	char *spath = zpool_vdev_name(zhp->zpool_hdl, zhp,
	schild[sc], 0);
	boolean_t result = (strcmp(mpath, spath) == 0);

	free(spath);
	if (result) {
	free(mpath);
	return (mc);
	}
	}

	free(mpath);
	}

	return (-1);
	}

	/*
	* Split a mirror pool. If newroot points to null, then a new nvlist
	* is generated and it is the responsibility of the caller to free it.
	*/
	int
	zpool_vdev_split(zpool_handle_t zhp, char newname, nvlist_t **newroot,
	nvlist_t *props, splitflags_t flags)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024], *bias;
	nvlist_t tree, config, child, newchild, *newconfig = NULL;
	nvlist_t *varray = NULL, zc_props = NULL;
	uint_t c, children, newchildren, lastlog = 0, vcount, found = 0;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	uint64_t vers, readonly = B_FALSE;
	boolean_t freelist = B_FALSE, memory_err = B_TRUE;
	int retval = 0;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "Unable to split %s"), zhp->zpool_name);

	if (!zpool_name_valid(hdl, B_FALSE, newname))
	return (zfs_error(hdl, EZFS_INVALIDNAME, msg));

	if ((config = zpool_get_config(zhp, NULL)) == NULL) {
	(void) fprintf(stderr, gettext("Internal error: unable to "
	"retrieve pool configuration\n"));
	return (-1);
	}

	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &tree)
	== 0);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, &vers) == 0);

	if (props) {
	prop_flags_t flags = { .create = B_FALSE, .import = B_TRUE };
	if ((zc_props = zpool_valid_proplist(hdl, zhp->zpool_name,
	props, vers, flags, msg)) == NULL)
	return (-1);
	(void) nvlist_lookup_uint64(zc_props,
	zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly);
	if (readonly) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property %s can only be set at import time"),
	zpool_prop_to_name(ZPOOL_PROP_READONLY));
	return (-1);
	}
	}

	if (nvlist_lookup_nvlist_array(tree, ZPOOL_CONFIG_CHILDREN, &child,
	&children) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Source pool is missing vdev tree"));
	nvlist_free(zc_props);
	return (-1);
	}

	varray = zfs_alloc(hdl, children * sizeof (nvlist_t *));
	vcount = 0;

	if (*newroot == NULL \|\|
	nvlist_lookup_nvlist_array(*newroot, ZPOOL_CONFIG_CHILDREN,
	&newchild, &newchildren) != 0)
	newchildren = 0;

	for (c = 0; c < children; c++) {
	uint64_t is_log = B_FALSE, is_hole = B_FALSE;
	boolean_t is_special = B_FALSE, is_dedup = B_FALSE;
	char *type;
	nvlist_t *mchild, vdev;
	uint_t mchildren;
	int entry;

	/*
	* Unlike cache & spares, slogs are stored in the
	* ZPOOL_CONFIG_CHILDREN array. We filter them out here.
	*/
	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
	&is_log);
	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE,
	&is_hole);
	if (is_log \|\| is_hole) {
	/*
	* Create a hole vdev and put it in the config.
	*/
	if (nvlist_alloc(&vdev, NV_UNIQUE_NAME, 0) != 0)
	goto out;
	if (nvlist_add_string(vdev, ZPOOL_CONFIG_TYPE,
	VDEV_TYPE_HOLE) != 0)
	goto out;
	if (nvlist_add_uint64(vdev, ZPOOL_CONFIG_IS_HOLE,
	1) != 0)
	goto out;
	if (lastlog == 0)
	lastlog = vcount;
	varray[vcount++] = vdev;
	continue;
	}
	lastlog = 0;
	verify(nvlist_lookup_string(child[c], ZPOOL_CONFIG_TYPE, &type)
	== 0);

	if (strcmp(type, VDEV_TYPE_INDIRECT) == 0) {
	vdev = child[c];
	if (nvlist_dup(vdev, &varray[vcount++], 0) != 0)
	goto out;
	continue;
	} else if (strcmp(type, VDEV_TYPE_MIRROR) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Source pool must be composed only of mirrors\n"));
	retval = zfs_error(hdl, EZFS_INVALCONFIG, msg);
	goto out;
	}

	if (nvlist_lookup_string(child[c],
	ZPOOL_CONFIG_ALLOCATION_BIAS, &bias) == 0) {
	if (strcmp(bias, VDEV_ALLOC_BIAS_SPECIAL) == 0)
	is_special = B_TRUE;
	else if (strcmp(bias, VDEV_ALLOC_BIAS_DEDUP) == 0)
	is_dedup = B_TRUE;
	}
	verify(nvlist_lookup_nvlist_array(child[c],
	ZPOOL_CONFIG_CHILDREN, &mchild, &mchildren) == 0);

	/* find or add an entry for this top-level vdev */
	if (newchildren > 0 &&
	(entry = find_vdev_entry(zhp, mchild, mchildren,
	newchild, newchildren)) >= 0) {
	/* We found a disk that the user specified. */
	vdev = mchild[entry];
	++found;
	} else {
	/* User didn't specify a disk for this vdev. */
	vdev = mchild[mchildren - 1];
	}

	if (nvlist_dup(vdev, &varray[vcount++], 0) != 0)
	goto out;

	if (flags.dryrun != 0) {
	if (is_dedup == B_TRUE) {
	if (nvlist_add_string(varray[vcount - 1],
	ZPOOL_CONFIG_ALLOCATION_BIAS,
	VDEV_ALLOC_BIAS_DEDUP) != 0)
	goto out;
	} else if (is_special == B_TRUE) {
	if (nvlist_add_string(varray[vcount - 1],
	ZPOOL_CONFIG_ALLOCATION_BIAS,
	VDEV_ALLOC_BIAS_SPECIAL) != 0)
	goto out;
	}
	}
	}

	/* did we find every disk the user specified? */
	if (found != newchildren) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "Device list must "
	"include at most one disk from each mirror"));
	retval = zfs_error(hdl, EZFS_INVALCONFIG, msg);
	goto out;
	}

	/* Prepare the nvlist for populating. */
	if (*newroot == NULL) {
	if (nvlist_alloc(newroot, NV_UNIQUE_NAME, 0) != 0)
	goto out;
	freelist = B_TRUE;
	if (nvlist_add_string(*newroot, ZPOOL_CONFIG_TYPE,
	VDEV_TYPE_ROOT) != 0)
	goto out;
	} else {
	verify(nvlist_remove_all(*newroot, ZPOOL_CONFIG_CHILDREN) == 0);
	}

	/* Add all the children we found */
	if (nvlist_add_nvlist_array(*newroot, ZPOOL_CONFIG_CHILDREN, varray,
	lastlog == 0 ? vcount : lastlog) != 0)
	goto out;

	/*
	* If we're just doing a dry run, exit now with success.
	*/
	if (flags.dryrun) {
	memory_err = B_FALSE;
	freelist = B_FALSE;
	goto out;
	}

	/* now build up the config list & call the ioctl */
	if (nvlist_alloc(&newconfig, NV_UNIQUE_NAME, 0) != 0)
	goto out;

	if (nvlist_add_nvlist(newconfig,
	ZPOOL_CONFIG_VDEV_TREE, *newroot) != 0 \|\|
	nvlist_add_string(newconfig,
	ZPOOL_CONFIG_POOL_NAME, newname) != 0 \|\|
	nvlist_add_uint64(newconfig, ZPOOL_CONFIG_VERSION, vers) != 0)
	goto out;

	/*
	* The new pool is automatically part of the namespace unless we
	* explicitly export it.
	*/
	if (!flags.import)
	zc.zc_cookie = ZPOOL_EXPORT_AFTER_SPLIT;
	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	(void) strlcpy(zc.zc_string, newname, sizeof (zc.zc_string));
	if (zcmd_write_conf_nvlist(hdl, &zc, newconfig) != 0)
	goto out;
	if (zc_props != NULL && zcmd_write_src_nvlist(hdl, &zc, zc_props) != 0)
	goto out;

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SPLIT, &zc) != 0) {
	retval = zpool_standard_error(hdl, errno, msg);
	goto out;
	}

	freelist = B_FALSE;
	memory_err = B_FALSE;

	out:
	if (varray != NULL) {
	int v;

	for (v = 0; v < vcount; v++)
	nvlist_free(varray[v]);
	free(varray);
	}
	zcmd_free_nvlists(&zc);
	nvlist_free(zc_props);
	nvlist_free(newconfig);
	if (freelist) {
	nvlist_free(*newroot);
	*newroot = NULL;
	}

	if (retval != 0)
	return (retval);

	if (memory_err)
	return (no_memory(hdl));

	return (0);
	}

	/*
	* Remove the given device.
	*/
	int
	zpool_vdev_remove(zpool_handle_t zhp, const char path)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache, islog;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	uint64_t version;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot remove %s"), path);

	if (zpool_is_draid_spare(path)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"dRAID spares cannot be removed"));
	return (zfs_error(hdl, EZFS_NODEVICE, msg));
	}

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
	&islog)) == NULL)
	return (zfs_error(hdl, EZFS_NODEVICE, msg));

	version = zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL);
	if (islog && version < SPA_VERSION_HOLES) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"pool must be upgraded to support log removal"));
	return (zfs_error(hdl, EZFS_BADVERSION, msg));
	}

	zc.zc_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_REMOVE, &zc) == 0)
	return (0);

	switch (errno) {

	case EINVAL:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"invalid config; all top-level vdevs must "
	"have the same sector size and not be raidz."));
	(void) zfs_error(hdl, EZFS_INVALCONFIG, msg);
	break;

	case EBUSY:
	if (islog) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Mount encrypted datasets to replay logs."));
	} else {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Pool busy; removal may already be in progress"));
	}
	(void) zfs_error(hdl, EZFS_BUSY, msg);
	break;

	case EACCES:
	if (islog) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Mount encrypted datasets to replay logs."));
	(void) zfs_error(hdl, EZFS_BUSY, msg);
	} else {
	(void) zpool_standard_error(hdl, errno, msg);
	}
	break;

	default:
	(void) zpool_standard_error(hdl, errno, msg);
	}
	return (-1);
	}

	int
	zpool_vdev_remove_cancel(zpool_handle_t *zhp)
	{
	zfs_cmd_t zc;
	char msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot cancel removal"));

	bzero(&zc, sizeof (zc));
	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	zc.zc_cookie = 1;

	if (zfs_ioctl(hdl, ZFS_IOC_VDEV_REMOVE, &zc) == 0)
	return (0);

	return (zpool_standard_error(hdl, errno, msg));
	}

	int
	zpool_vdev_indirect_size(zpool_handle_t zhp, const char path,
	uint64_t *sizep)
	{
	char msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache, islog;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot determine indirect size of %s"),
	path);

	if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
	&islog)) == NULL)
	return (zfs_error(hdl, EZFS_NODEVICE, msg));

	if (avail_spare \|\| l2cache \|\| islog) {
	*sizep = 0;
	return (0);
	}

	if (nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_INDIRECT_SIZE, sizep) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"indirect size not available"));
	return (zfs_error(hdl, EINVAL, msg));
	}
	return (0);
	}

	/*
	* Clear the errors for the pool, or the particular device if specified.
	*/
	int
	zpool_clear(zpool_handle_t zhp, const char path, nvlist_t *rewindnvl)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	nvlist_t *tgt;
	zpool_load_policy_t policy;
	boolean_t avail_spare, l2cache;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	nvlist_t *nvi = NULL;
	int error;

	if (path)
	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot clear errors for %s"),
	path);
	else
	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot clear errors for %s"),
	zhp->zpool_name);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	if (path) {
	if ((tgt = zpool_find_vdev(zhp, path, &avail_spare,
	&l2cache, NULL)) == NULL)
	return (zfs_error(hdl, EZFS_NODEVICE, msg));

	/*
	* Don't allow error clearing for hot spares. Do allow
	* error clearing for l2cache devices.
	*/
	if (avail_spare)
	return (zfs_error(hdl, EZFS_ISSPARE, msg));

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID,
	&zc.zc_guid) == 0);
	}

	zpool_get_load_policy(rewindnvl, &policy);
	zc.zc_cookie = policy.zlp_rewind;

	if (zcmd_alloc_dst_nvlist(hdl, &zc, zhp->zpool_config_size * 2) != 0)
	return (-1);

	if (zcmd_write_src_nvlist(hdl, &zc, rewindnvl) != 0)
	return (-1);

	while ((error = zfs_ioctl(hdl, ZFS_IOC_CLEAR, &zc)) != 0 &&
	errno == ENOMEM) {
	if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
	zcmd_free_nvlists(&zc);
	return (-1);
	}
	}

	if (!error \|\| ((policy.zlp_rewind & ZPOOL_TRY_REWIND) &&
	errno != EPERM && errno != EACCES)) {
	if (policy.zlp_rewind &
	(ZPOOL_DO_REWIND \| ZPOOL_TRY_REWIND)) {
	(void) zcmd_read_dst_nvlist(hdl, &zc, &nvi);
	zpool_rewind_exclaim(hdl, zc.zc_name,
	((policy.zlp_rewind & ZPOOL_TRY_REWIND) != 0),
	nvi);
	nvlist_free(nvi);
	}
	zcmd_free_nvlists(&zc);
	return (0);
	}

	zcmd_free_nvlists(&zc);
	return (zpool_standard_error(hdl, errno, msg));
	}

	/*
	* Similar to zpool_clear(), but takes a GUID (used by fmd).
	*/
	int
	zpool_vdev_clear(zpool_handle_t *zhp, uint64_t guid)
	{
	zfs_cmd_t zc = {"\0"};
	char msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot clear errors for %llx"),
	(u_longlong_t)guid);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	zc.zc_guid = guid;
	zc.zc_cookie = ZPOOL_NO_REWIND;

	if (zfs_ioctl(hdl, ZFS_IOC_CLEAR, &zc) == 0)
	return (0);

	return (zpool_standard_error(hdl, errno, msg));
	}

	/*
	* Change the GUID for a pool.
	*/
	int
	zpool_reguid(zpool_handle_t *zhp)
	{
	char msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	zfs_cmd_t zc = {"\0"};

	(void) snprintf(msg, sizeof (msg),
	dgettext(TEXT_DOMAIN, "cannot reguid '%s'"), zhp->zpool_name);

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	if (zfs_ioctl(hdl, ZFS_IOC_POOL_REGUID, &zc) == 0)
	return (0);

	return (zpool_standard_error(hdl, errno, msg));
	}

	/*
	* Reopen the pool.
	*/
	int
	zpool_reopen_one(zpool_handle_t zhp, void data)
	{
	libzfs_handle_t *hdl = zpool_get_handle(zhp);
	const char *pool_name = zpool_get_name(zhp);
	boolean_t *scrub_restart = data;
	int error;

	error = lzc_reopen(pool_name, *scrub_restart);
	if (error) {
	return (zpool_standard_error_fmt(hdl, error,
	dgettext(TEXT_DOMAIN, "cannot reopen '%s'"), pool_name));
	}

	return (0);
	}

	/* call into libzfs_core to execute the sync IOCTL per pool */
	int
	zpool_sync_one(zpool_handle_t zhp, void data)
	{
	int ret;
	libzfs_handle_t *hdl = zpool_get_handle(zhp);
	const char *pool_name = zpool_get_name(zhp);
	boolean_t *force = data;
	nvlist_t *innvl = fnvlist_alloc();

	fnvlist_add_boolean_value(innvl, "force", *force);
	if ((ret = lzc_sync(pool_name, innvl, NULL)) != 0) {
	nvlist_free(innvl);
	return (zpool_standard_error_fmt(hdl, ret,
	dgettext(TEXT_DOMAIN, "sync '%s' failed"), pool_name));
	}
	nvlist_free(innvl);

	return (0);
	}

	#define PATH_BUF_LEN 64

	/*
	* Given a vdev, return the name to display in iostat. If the vdev has a path,
	* we use that, stripping off any leading "/dev/dsk/"; if not, we use the type.
	* We also check if this is a whole disk, in which case we strip off the
	* trailing 's0' slice name.
	*
	* This routine is also responsible for identifying when disks have been
	* reconfigured in a new location. The kernel will have opened the device by
	* devid, but the path will still refer to the old location. To catch this, we
	* first do a path -> devid translation (which is fast for the common case). If
	* the devid matches, we're done. If not, we do a reverse devid -> path
	* translation and issue the appropriate ioctl() to update the path of the vdev.
	* If 'zhp' is NULL, then this is an exported pool, and we don't need to do any
	* of these checks.
	*/
	char *
	zpool_vdev_name(libzfs_handle_t hdl, zpool_handle_t zhp, nvlist_t *nv,
	int name_flags)
	{
	char path, type, *env;
	uint64_t value;
	char buf[PATH_BUF_LEN];
	char tmpbuf[PATH_BUF_LEN];

	/*
	* vdev_name will be "root"/"root-0" for the root vdev, but it is the
	* zpool name that will be displayed to the user.
	*/
	verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
	if (zhp != NULL && strcmp(type, "root") == 0)
	return (zfs_strdup(hdl, zpool_get_name(zhp)));

	env = getenv("ZPOOL_VDEV_NAME_PATH");
	if (env && (strtoul(env, NULL, 0) > 0 \|\|
	!strncasecmp(env, "YES", 3) \|\| !strncasecmp(env, "ON", 2)))
	name_flags \|= VDEV_NAME_PATH;

	env = getenv("ZPOOL_VDEV_NAME_GUID");
	if (env && (strtoul(env, NULL, 0) > 0 \|\|
	!strncasecmp(env, "YES", 3) \|\| !strncasecmp(env, "ON", 2)))
	name_flags \|= VDEV_NAME_GUID;

	env = getenv("ZPOOL_VDEV_NAME_FOLLOW_LINKS");
	if (env && (strtoul(env, NULL, 0) > 0 \|\|
	!strncasecmp(env, "YES", 3) \|\| !strncasecmp(env, "ON", 2)))
	name_flags \|= VDEV_NAME_FOLLOW_LINKS;

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, &value) == 0 \|\|
	name_flags & VDEV_NAME_GUID) {
	(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &value);
	(void) snprintf(buf, sizeof (buf), "%llu", (u_longlong_t)value);
	path = buf;
	} else if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0) {
	if (name_flags & VDEV_NAME_FOLLOW_LINKS) {
	char *rp = realpath(path, NULL);
	if (rp) {
	strlcpy(buf, rp, sizeof (buf));
	path = buf;
	free(rp);
	}
	}

	/*
	* For a block device only use the name.
	*/
	if ((strcmp(type, VDEV_TYPE_DISK) == 0) &&
	!(name_flags & VDEV_NAME_PATH)) {
	path = zfs_strip_path(path);
	}

	/*
	* Remove the partition from the path if this is a whole disk.
	*/
	if (strcmp(type, VDEV_TYPE_DRAID_SPARE) != 0 &&
	nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, &value)
	== 0 && value && !(name_flags & VDEV_NAME_PATH)) {
	return (zfs_strip_partition(path));
	}
	} else {
	path = type;

	/*
	* If it's a raidz device, we need to stick in the parity level.
	*/
	if (strcmp(path, VDEV_TYPE_RAIDZ) == 0) {
	verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY,
	&value) == 0);
	(void) snprintf(buf, sizeof (buf), "%s%llu", path,
	(u_longlong_t)value);
	path = buf;
	}

	/*
	* If it's a dRAID device, we add parity, groups, and spares.
	*/
	if (strcmp(path, VDEV_TYPE_DRAID) == 0) {
	uint64_t ndata, nparity, nspares;
	nvlist_t **child;
	uint_t children;

	verify(nvlist_lookup_nvlist_array(nv,
	ZPOOL_CONFIG_CHILDREN, &child, &children) == 0);
	verify(nvlist_lookup_uint64(nv,
	ZPOOL_CONFIG_NPARITY, &nparity) == 0);
	verify(nvlist_lookup_uint64(nv,
	ZPOOL_CONFIG_DRAID_NDATA, &ndata) == 0);
	verify(nvlist_lookup_uint64(nv,
	ZPOOL_CONFIG_DRAID_NSPARES, &nspares) == 0);

	path = zpool_draid_name(buf, sizeof (buf), ndata,
	nparity, nspares, children);
	}

	/*
	* We identify each top-level vdev by using a <type-id>
	* naming convention.
	*/
	if (name_flags & VDEV_NAME_TYPE_ID) {
	uint64_t id;
	verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID,
	&id) == 0);
	(void) snprintf(tmpbuf, sizeof (tmpbuf), "%s-%llu",
	path, (u_longlong_t)id);
	path = tmpbuf;
	}
	}

	return (zfs_strdup(hdl, path));
	}

	static int
	zbookmark_mem_compare(const void a, const void b)
	{
	return (memcmp(a, b, sizeof (zbookmark_phys_t)));
	}

	/*
	* Retrieve the persistent error log, uniquify the members, and return to the
	* caller.
	*/
	int
	zpool_get_errlog(zpool_handle_t zhp, nvlist_t *nverrlistp)
	{
	zfs_cmd_t zc = {"\0"};
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	uint64_t count;
	zbookmark_phys_t *zb = NULL;
	int i;

	/*
	* Retrieve the raw error list from the kernel. If the number of errors
	* has increased, allocate more space and continue until we get the
	* entire list.
	*/
	verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_ERRCOUNT,
	&count) == 0);
	if (count == 0)
	return (0);
	zc.zc_nvlist_dst = (uintptr_t)zfs_alloc(zhp->zpool_hdl,
	count * sizeof (zbookmark_phys_t));
	zc.zc_nvlist_dst_size = count;
	(void) strcpy(zc.zc_name, zhp->zpool_name);
	for (;;) {
	if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_ERROR_LOG,
	&zc) != 0) {
	free((void *)(uintptr_t)zc.zc_nvlist_dst);
	if (errno == ENOMEM) {
	void *dst;

	count = zc.zc_nvlist_dst_size;
	dst = zfs_alloc(zhp->zpool_hdl, count *
	sizeof (zbookmark_phys_t));
	zc.zc_nvlist_dst = (uintptr_t)dst;
	} else {
	return (zpool_standard_error_fmt(hdl, errno,
	dgettext(TEXT_DOMAIN, "errors: List of "
	"errors unavailable")));
	}
	} else {
	break;
	}
	}

	/*
	* Sort the resulting bookmarks. This is a little confusing due to the
	* implementation of ZFS_IOC_ERROR_LOG. The bookmarks are copied last
	* to first, and 'zc_nvlist_dst_size' indicates the number of bookmarks
	* _not_ copied as part of the process. So we point the start of our
	* array appropriate and decrement the total number of elements.
	*/
	zb = ((zbookmark_phys_t *)(uintptr_t)zc.zc_nvlist_dst) +
	zc.zc_nvlist_dst_size;
	count -= zc.zc_nvlist_dst_size;

	qsort(zb, count, sizeof (zbookmark_phys_t), zbookmark_mem_compare);

	verify(nvlist_alloc(nverrlistp, 0, KM_SLEEP) == 0);

	/*
	* Fill in the nverrlistp with nvlist's of dataset and object numbers.
	*/
	for (i = 0; i < count; i++) {
	nvlist_t *nv;

	/* ignoring zb_blkid and zb_level for now */
	if (i > 0 && zb[i-1].zb_objset == zb[i].zb_objset &&
	zb[i-1].zb_object == zb[i].zb_object)
	continue;

	if (nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) != 0)
	goto nomem;
	if (nvlist_add_uint64(nv, ZPOOL_ERR_DATASET,
	zb[i].zb_objset) != 0) {
	nvlist_free(nv);
	goto nomem;
	}
	if (nvlist_add_uint64(nv, ZPOOL_ERR_OBJECT,
	zb[i].zb_object) != 0) {
	nvlist_free(nv);
	goto nomem;
	}
	if (nvlist_add_nvlist(*nverrlistp, "ejk", nv) != 0) {
	nvlist_free(nv);
	goto nomem;
	}
	nvlist_free(nv);
	}

	free((void *)(uintptr_t)zc.zc_nvlist_dst);
	return (0);

	nomem:
	free((void *)(uintptr_t)zc.zc_nvlist_dst);
	return (no_memory(zhp->zpool_hdl));
	}

	/*
	* Upgrade a ZFS pool to the latest on-disk version.
	*/
	int
	zpool_upgrade(zpool_handle_t *zhp, uint64_t new_version)
	{
	zfs_cmd_t zc = {"\0"};
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) strcpy(zc.zc_name, zhp->zpool_name);
	zc.zc_cookie = new_version;

	if (zfs_ioctl(hdl, ZFS_IOC_POOL_UPGRADE, &zc) != 0)
	return (zpool_standard_error_fmt(hdl, errno,
	dgettext(TEXT_DOMAIN, "cannot upgrade '%s'"),
	zhp->zpool_name));
	return (0);
	}

	void
	zfs_save_arguments(int argc, char *argv, char string, int len)
	{
	int i;

	(void) strlcpy(string, basename(argv[0]), len);
	for (i = 1; i < argc; i++) {
	(void) strlcat(string, " ", len);
	(void) strlcat(string, argv[i], len);
	}
	}

	int
	zpool_log_history(libzfs_handle_t hdl, const char message)
	{
	zfs_cmd_t zc = {"\0"};
	nvlist_t *args;
	int err;

	args = fnvlist_alloc();
	fnvlist_add_string(args, "message", message);
	err = zcmd_write_src_nvlist(hdl, &zc, args);
	if (err == 0)
	err = zfs_ioctl(hdl, ZFS_IOC_LOG_HISTORY, &zc);
	nvlist_free(args);
	zcmd_free_nvlists(&zc);
	return (err);
	}

	/*
	* Perform ioctl to get some command history of a pool.
	*
	* 'buf' is the buffer to fill up to 'len' bytes. 'off' is the
	* logical offset of the history buffer to start reading from.
	*
	* Upon return, 'off' is the next logical offset to read from and
	* 'len' is the actual amount of bytes read into 'buf'.
	*/
	static int
	get_history(zpool_handle_t zhp, char buf, uint64_t off, uint64_t len)
	{
	zfs_cmd_t zc = {"\0"};
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

	zc.zc_history = (uint64_t)(uintptr_t)buf;
	zc.zc_history_len = *len;
	zc.zc_history_offset = *off;

	if (zfs_ioctl(hdl, ZFS_IOC_POOL_GET_HISTORY, &zc) != 0) {
	switch (errno) {
	case EPERM:
	return (zfs_error_fmt(hdl, EZFS_PERM,
	dgettext(TEXT_DOMAIN,
	"cannot show history for pool '%s'"),
	zhp->zpool_name));
	case ENOENT:
	return (zfs_error_fmt(hdl, EZFS_NOHISTORY,
	dgettext(TEXT_DOMAIN, "cannot get history for pool "
	"'%s'"), zhp->zpool_name));
	case ENOTSUP:
	return (zfs_error_fmt(hdl, EZFS_BADVERSION,
	dgettext(TEXT_DOMAIN, "cannot get history for pool "
	"'%s', pool must be upgraded"), zhp->zpool_name));
	default:
	return (zpool_standard_error_fmt(hdl, errno,
	dgettext(TEXT_DOMAIN,
	"cannot get history for '%s'"), zhp->zpool_name));
	}
	}

	*len = zc.zc_history_len;
	*off = zc.zc_history_offset;

	return (0);
	}

	/*
	* Retrieve the command history of a pool.
	*/
	int
	zpool_get_history(zpool_handle_t zhp, nvlist_t nvhisp, uint64_t off,
	boolean_t *eof)
	{
	char *buf;
	int buflen = 128 * 1024;
	nvlist_t **records = NULL;
	uint_t numrecords = 0;
	int err, i;
	uint64_t start = *off;

	buf = malloc(buflen);
	if (buf == NULL)
	return (ENOMEM);
	/* process about 1MB a time */
	while (off - start < 1024 1024) {
	uint64_t bytes_read = buflen;
	uint64_t leftover;

	if ((err = get_history(zhp, buf, off, &bytes_read)) != 0)
	break;

	/* if nothing else was read in, we're at EOF, just return */
	if (!bytes_read) {
	*eof = B_TRUE;
	break;
	}

	if ((err = zpool_history_unpack(buf, bytes_read,
	&leftover, &records, &numrecords)) != 0)
	break;
	*off -= leftover;
	if (leftover == bytes_read) {
	/*
	* no progress made, because buffer is not big enough
	* to hold this record; resize and retry.
	*/
	buflen *= 2;
	free(buf);
	buf = malloc(buflen);
	if (buf == NULL)
	return (ENOMEM);
	}
	}

	free(buf);

	if (!err) {
	verify(nvlist_alloc(nvhisp, NV_UNIQUE_NAME, 0) == 0);
	verify(nvlist_add_nvlist_array(*nvhisp, ZPOOL_HIST_RECORD,
	records, numrecords) == 0);
	}
	for (i = 0; i < numrecords; i++)
	nvlist_free(records[i]);
	free(records);

	return (err);
	}

	/*
	* Retrieve the next event given the passed 'zevent_fd' file descriptor.
	* If there is a new event available 'nvp' will contain a newly allocated
	* nvlist and 'dropped' will be set to the number of missed events since
	* the last call to this function. When 'nvp' is set to NULL it indicates
	* no new events are available. In either case the function returns 0 and
	* it is up to the caller to free 'nvp'. In the case of a fatal error the
	* function will return a non-zero value. When the function is called in
	* blocking mode (the default, unless the ZEVENT_NONBLOCK flag is passed),
	* it will not return until a new event is available.
	*/
	int
	zpool_events_next(libzfs_handle_t hdl, nvlist_t *nvp,
	int *dropped, unsigned flags, int zevent_fd)
	{
	zfs_cmd_t zc = {"\0"};
	int error = 0;

	*nvp = NULL;
	*dropped = 0;
	zc.zc_cleanup_fd = zevent_fd;

	if (flags & ZEVENT_NONBLOCK)
	zc.zc_guid = ZEVENT_NONBLOCK;

	if (zcmd_alloc_dst_nvlist(hdl, &zc, ZEVENT_SIZE) != 0)
	return (-1);

	retry:
	if (zfs_ioctl(hdl, ZFS_IOC_EVENTS_NEXT, &zc) != 0) {
	switch (errno) {
	case ESHUTDOWN:
	error = zfs_error_fmt(hdl, EZFS_POOLUNAVAIL,
	dgettext(TEXT_DOMAIN, "zfs shutdown"));
	goto out;
	case ENOENT:
	/* Blocking error case should not occur */
	if (!(flags & ZEVENT_NONBLOCK))
	error = zpool_standard_error_fmt(hdl, errno,
	dgettext(TEXT_DOMAIN, "cannot get event"));

	goto out;
	case ENOMEM:
	if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
	error = zfs_error_fmt(hdl, EZFS_NOMEM,
	dgettext(TEXT_DOMAIN, "cannot get event"));
	goto out;
	} else {
	goto retry;
	}
	default:
	error = zpool_standard_error_fmt(hdl, errno,
	dgettext(TEXT_DOMAIN, "cannot get event"));
	goto out;
	}
	}

	error = zcmd_read_dst_nvlist(hdl, &zc, nvp);
	if (error != 0)
	goto out;

	*dropped = (int)zc.zc_cookie;
	out:
	zcmd_free_nvlists(&zc);

	return (error);
	}

	/*
	* Clear all events.
	*/
	int
	zpool_events_clear(libzfs_handle_t hdl, int count)
	{
	zfs_cmd_t zc = {"\0"};

	if (zfs_ioctl(hdl, ZFS_IOC_EVENTS_CLEAR, &zc) != 0)
	return (zpool_standard_error(hdl, errno,
	dgettext(TEXT_DOMAIN, "cannot clear events")));

	if (count != NULL)
	count = (int)zc.zc_cookie; / # of events cleared */

	return (0);
	}

	/*
	* Seek to a specific EID, ZEVENT_SEEK_START, or ZEVENT_SEEK_END for
	* the passed zevent_fd file handle. On success zero is returned,
	* otherwise -1 is returned and hdl->libzfs_error is set to the errno.
	*/
	int
	zpool_events_seek(libzfs_handle_t *hdl, uint64_t eid, int zevent_fd)
	{
	zfs_cmd_t zc = {"\0"};
	int error = 0;

	zc.zc_guid = eid;
	zc.zc_cleanup_fd = zevent_fd;

	if (zfs_ioctl(hdl, ZFS_IOC_EVENTS_SEEK, &zc) != 0) {
	switch (errno) {
	case ENOENT:
	error = zfs_error_fmt(hdl, EZFS_NOENT,
	dgettext(TEXT_DOMAIN, "cannot get event"));
	break;

	case ENOMEM:
	error = zfs_error_fmt(hdl, EZFS_NOMEM,
	dgettext(TEXT_DOMAIN, "cannot get event"));
	break;

	default:
	error = zpool_standard_error_fmt(hdl, errno,
	dgettext(TEXT_DOMAIN, "cannot get event"));
	break;
	}
	}

	return (error);
	}

	static void
	zpool_obj_to_path_impl(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
	char *pathname, size_t len, boolean_t always_unmounted)
	{
	zfs_cmd_t zc = {"\0"};
	boolean_t mounted = B_FALSE;
	char *mntpnt = NULL;
	char dsname[ZFS_MAX_DATASET_NAME_LEN];

	if (dsobj == 0) {
	/* special case for the MOS */
	(void) snprintf(pathname, len, "<metadata>:<0x%llx>",
	(longlong_t)obj);
	return;
	}

	/* get the dataset's name */
	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	zc.zc_obj = dsobj;
	if (zfs_ioctl(zhp->zpool_hdl,
	ZFS_IOC_DSOBJ_TO_DSNAME, &zc) != 0) {
	/* just write out a path of two object numbers */
	(void) snprintf(pathname, len, "<0x%llx>:<0x%llx>",
	(longlong_t)dsobj, (longlong_t)obj);
	return;
	}
	(void) strlcpy(dsname, zc.zc_value, sizeof (dsname));

	/* find out if the dataset is mounted */
	mounted = !always_unmounted && is_mounted(zhp->zpool_hdl, dsname,
	&mntpnt);

	/* get the corrupted object's path */
	(void) strlcpy(zc.zc_name, dsname, sizeof (zc.zc_name));
	zc.zc_obj = obj;
	if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_OBJ_TO_PATH,
	&zc) == 0) {
	if (mounted) {
	(void) snprintf(pathname, len, "%s%s", mntpnt,
	zc.zc_value);
	} else {
	(void) snprintf(pathname, len, "%s:%s",
	dsname, zc.zc_value);
	}
	} else {
	(void) snprintf(pathname, len, "%s:<0x%llx>", dsname,
	(longlong_t)obj);
	}
	free(mntpnt);
	}

	void
	zpool_obj_to_path(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
	char *pathname, size_t len)
	{
	zpool_obj_to_path_impl(zhp, dsobj, obj, pathname, len, B_FALSE);
	}

	void
	zpool_obj_to_path_ds(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
	char *pathname, size_t len)
	{
	zpool_obj_to_path_impl(zhp, dsobj, obj, pathname, len, B_TRUE);
	}
	/*
	* Wait while the specified activity is in progress in the pool.
	*/
	int
	zpool_wait(zpool_handle_t *zhp, zpool_wait_activity_t activity)
	{
	boolean_t missing;

	int error = zpool_wait_status(zhp, activity, &missing, NULL);

	if (missing) {
	(void) zpool_standard_error_fmt(zhp->zpool_hdl, ENOENT,
	dgettext(TEXT_DOMAIN, "error waiting in pool '%s'"),
	zhp->zpool_name);
	return (ENOENT);
	} else {
	return (error);
	}
	}

	/*
	* Wait for the given activity and return the status of the wait (whether or not
	* any waiting was done) in the 'waited' parameter. Non-existent pools are
	* reported via the 'missing' parameter, rather than by printing an error
	* message. This is convenient when this function is called in a loop over a
	* long period of time (as it is, for example, by zpool's wait cmd). In that
	* scenario, a pool being exported or destroyed should be considered a normal
	* event, so we don't want to print an error when we find that the pool doesn't
	* exist.
	*/
	int
	zpool_wait_status(zpool_handle_t *zhp, zpool_wait_activity_t activity,
	boolean_t missing, boolean_t waited)
	{
	int error = lzc_wait(zhp->zpool_name, activity, waited);
	*missing = (error == ENOENT);
	if (*missing)
	return (0);

	if (error != 0) {
	(void) zpool_standard_error_fmt(zhp->zpool_hdl, error,
	dgettext(TEXT_DOMAIN, "error waiting in pool '%s'"),
	zhp->zpool_name);
	}

	return (error);
	}

	int
	zpool_set_bootenv(zpool_handle_t zhp, const nvlist_t envmap)
	{
	int error = lzc_set_bootenv(zhp->zpool_name, envmap);
	if (error != 0) {
	(void) zpool_standard_error_fmt(zhp->zpool_hdl, error,
	dgettext(TEXT_DOMAIN,
	"error setting bootenv in pool '%s'"), zhp->zpool_name);
	}

	return (error);
	}

	int
	zpool_get_bootenv(zpool_handle_t zhp, nvlist_t *nvlp)
	{
	nvlist_t *nvl;
	int error;

	nvl = NULL;
	error = lzc_get_bootenv(zhp->zpool_name, &nvl);
	if (error != 0) {
	(void) zpool_standard_error_fmt(zhp->zpool_hdl, error,
	dgettext(TEXT_DOMAIN,
	"error getting bootenv in pool '%s'"), zhp->zpool_name);
	} else {
	*nvlp = nvl;
	}

	return (error);
	}

	/*
	* Attempt to read and parse feature file(s) (from "compatibility" property).
	* Files contain zpool feature names, comma or whitespace-separated.
	* Comments (# character to next newline) are discarded.
	*
	* Arguments:
	* compatibility : string containing feature filenames
	* features : either NULL or pointer to array of boolean
	* report : either NULL or pointer to string buffer
	* rlen : length of "report" buffer
	*
	* compatibility is NULL (unset), "", "off", "legacy", or list of
	* comma-separated filenames. filenames should either be absolute,
	* or relative to:
	* 1) ZPOOL_SYSCONF_COMPAT_D (eg: /etc/zfs/compatibility.d) or
	* 2) ZPOOL_DATA_COMPAT_D (eg: /usr/share/zfs/compatibility.d).
	* (Unset), "" or "off" => enable all features
	* "legacy" => disable all features
	*
	* Any feature names read from files which match unames in spa_feature_table
	* will have the corresponding boolean set in the features array (if non-NULL).
	* If more than one feature set specified, only features present in all of
	* them will be set.
	*
	* "report" if not NULL will be populated with a suitable status message.
	*
	* Return values:
	* ZPOOL_COMPATIBILITY_OK : files read and parsed ok
	* ZPOOL_COMPATIBILITY_BADFILE : file too big or not a text file
	* ZPOOL_COMPATIBILITY_BADTOKEN : SYSCONF file contains invalid feature name
	* ZPOOL_COMPATIBILITY_WARNTOKEN : DATA file contains invalid feature name
	* ZPOOL_COMPATIBILITY_NOFILES : no feature files found
	*/
	zpool_compat_status_t
	zpool_load_compat(const char compat, boolean_t features, char *report,
	size_t rlen)
	{
	int sdirfd, ddirfd, featfd;
	struct stat fs;
	char *fc;
	char ps, ls, *ws;
	char file, line, *word;

	char l_compat[ZFS_MAXPROPLEN];

	boolean_t ret_nofiles = B_TRUE;
	boolean_t ret_badfile = B_FALSE;
	boolean_t ret_badtoken = B_FALSE;
	boolean_t ret_warntoken = B_FALSE;

	/* special cases (unset), "" and "off" => enable all features */
	if (compat == NULL \|\| compat[0] == '\0' \|\|
	strcmp(compat, ZPOOL_COMPAT_OFF) == 0) {
	if (features != NULL)
	for (uint_t i = 0; i < SPA_FEATURES; i++)
	features[i] = B_TRUE;
	if (report != NULL)
	strlcpy(report, gettext("all features enabled"), rlen);
	return (ZPOOL_COMPATIBILITY_OK);
	}

	/* Final special case "legacy" => disable all features */
	if (strcmp(compat, ZPOOL_COMPAT_LEGACY) == 0) {
	if (features != NULL)
	for (uint_t i = 0; i < SPA_FEATURES; i++)
	features[i] = B_FALSE;
	if (report != NULL)
	strlcpy(report, gettext("all features disabled"), rlen);
	return (ZPOOL_COMPATIBILITY_OK);
	}

	/*
	* Start with all true; will be ANDed with results from each file
	*/
	if (features != NULL)
	for (uint_t i = 0; i < SPA_FEATURES; i++)
	features[i] = B_TRUE;

	char err_badfile[1024] = "";
	char err_badtoken[1024] = "";

	/*
	* We ignore errors from the directory open()
	* as they're only needed if the filename is relative
	* which will be checked during the openat().
	*/

	/* O_PATH safer than O_RDONLY if system allows it */
	#if defined(O_PATH)
	#define ZC_DIR_FLAGS (O_DIRECTORY \| O_CLOEXEC \| O_PATH)
	#else
	#define ZC_DIR_FLAGS (O_DIRECTORY \| O_CLOEXEC \| O_RDONLY)
	#endif

	sdirfd = open(ZPOOL_SYSCONF_COMPAT_D, ZC_DIR_FLAGS);
	ddirfd = open(ZPOOL_DATA_COMPAT_D, ZC_DIR_FLAGS);

	(void) strlcpy(l_compat, compat, ZFS_MAXPROPLEN);

	for (file = strtok_r(l_compat, ",", &ps);
	file != NULL;
	file = strtok_r(NULL, ",", &ps)) {

	boolean_t l_features[SPA_FEATURES];

	enum { Z_SYSCONF, Z_DATA } source;

	/* try sysconfdir first, then datadir */
	source = Z_SYSCONF;
	if ((featfd = openat(sdirfd, file, O_RDONLY \| O_CLOEXEC)) < 0) {
	featfd = openat(ddirfd, file, O_RDONLY \| O_CLOEXEC);
	source = Z_DATA;
	}

	/* File readable and correct size? */
	if (featfd < 0 \|\|
	fstat(featfd, &fs) < 0 \|\|
	fs.st_size < 1 \|\|
	fs.st_size > ZPOOL_COMPAT_MAXSIZE) {
	(void) close(featfd);
	strlcat(err_badfile, file, ZFS_MAXPROPLEN);
	strlcat(err_badfile, " ", ZFS_MAXPROPLEN);
	ret_badfile = B_TRUE;
	continue;
	}

	/* Prefault the file if system allows */
	#if defined(MAP_POPULATE)
	#define ZC_MMAP_FLAGS (MAP_PRIVATE \| MAP_POPULATE)
	#elif defined(MAP_PREFAULT_READ)
	#define ZC_MMAP_FLAGS (MAP_PRIVATE \| MAP_PREFAULT_READ)
	#else
	#define ZC_MMAP_FLAGS (MAP_PRIVATE)
	#endif

	/* private mmap() so we can strtok safely */
	fc = (char *)mmap(NULL, fs.st_size, PROT_READ \| PROT_WRITE,
	ZC_MMAP_FLAGS, featfd, 0);
	(void) close(featfd);

	/* map ok, and last character == newline? */
	if (fc == MAP_FAILED \|\| fc[fs.st_size - 1] != '\n') {
	(void) munmap((void *) fc, fs.st_size);
	strlcat(err_badfile, file, ZFS_MAXPROPLEN);
	strlcat(err_badfile, " ", ZFS_MAXPROPLEN);
	ret_badfile = B_TRUE;
	continue;
	}

	ret_nofiles = B_FALSE;

	for (uint_t i = 0; i < SPA_FEATURES; i++)
	l_features[i] = B_FALSE;

	/* replace final newline with NULL to ensure string ends */
	fc[fs.st_size - 1] = '\0';

	for (line = strtok_r(fc, "\n", &ls);
	line != NULL;
	line = strtok_r(NULL, "\n", &ls)) {
	/* discard comments */
	- *(strchrnul(line, '#')) = '\0';
	+ char *r = strchr(line, '#');
	+ if (r != NULL)
	+ *r = '\0';

	for (word = strtok_r(line, ", \t", &ws);
	word != NULL;
	word = strtok_r(NULL, ", \t", &ws)) {
	/* Find matching feature name */
	uint_t f;
	for (f = 0; f < SPA_FEATURES; f++) {
	zfeature_info_t *fi =
	&spa_feature_table[f];
	if (strcmp(word, fi->fi_uname) == 0) {
	l_features[f] = B_TRUE;
	break;
	}
	}
	if (f < SPA_FEATURES)
	continue;

	/* found an unrecognized word */
	/* lightly sanitize it */
	if (strlen(word) > 32)
	word[32] = '\0';
	for (char c = word; c != '\0'; c++)
	if (!isprint(*c))
	*c = '?';

	strlcat(err_badtoken, word, ZFS_MAXPROPLEN);
	strlcat(err_badtoken, " ", ZFS_MAXPROPLEN);
	if (source == Z_SYSCONF)
	ret_badtoken = B_TRUE;
	else
	ret_warntoken = B_TRUE;
	}
	}
	(void) munmap((void *) fc, fs.st_size);

	if (features != NULL)
	for (uint_t i = 0; i < SPA_FEATURES; i++)
	features[i] &= l_features[i];
	}
	(void) close(sdirfd);
	(void) close(ddirfd);

	/* Return the most serious error */
	if (ret_badfile) {
	if (report != NULL)
	snprintf(report, rlen, gettext("could not read/"
	"parse feature file(s): %s"), err_badfile);
	return (ZPOOL_COMPATIBILITY_BADFILE);
	}
	if (ret_nofiles) {
	if (report != NULL)
	strlcpy(report,
	gettext("no valid compatibility files specified"),
	rlen);
	return (ZPOOL_COMPATIBILITY_NOFILES);
	}
	if (ret_badtoken) {
	if (report != NULL)
	snprintf(report, rlen, gettext("invalid feature "
	"name(s) in local compatibility files: %s"),
	err_badtoken);
	return (ZPOOL_COMPATIBILITY_BADTOKEN);
	}
	if (ret_warntoken) {
	if (report != NULL)
	snprintf(report, rlen, gettext("unrecognized feature "
	"name(s) in distribution compatibility files: %s"),
	err_badtoken);
	return (ZPOOL_COMPATIBILITY_WARNTOKEN);
	}
	if (report != NULL)
	strlcpy(report, gettext("compatibility set ok"), rlen);
	return (ZPOOL_COMPATIBILITY_OK);
	}
	diff --git a/sys/contrib/openzfs/lib/libzfs/libzfs_sendrecv.c b/sys/contrib/openzfs/lib/libzfs/libzfs_sendrecv.c
	index 5e7d06465d35..4340ff9552ef 100644
	--- a/sys/contrib/openzfs/lib/libzfs/libzfs_sendrecv.c
	+++ b/sys/contrib/openzfs/lib/libzfs/libzfs_sendrecv.c
	@@ -1,5203 +1,5202 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2012, Joyent, Inc. All rights reserved.
	* Copyright (c) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>.
	* All rights reserved
	* Copyright (c) 2013 Steven Hartland. All rights reserved.
	* Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
	* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
	* Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
	* Copyright (c) 2019 Datto Inc.
	*/

	#include <assert.h>
	#include <ctype.h>
	#include <errno.h>
	#include <libintl.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <strings.h>
	#include <unistd.h>
	#include <stddef.h>
	#include <fcntl.h>
	#include <sys/mount.h>
	#include <sys/mntent.h>
	#include <sys/mnttab.h>
	#include <sys/avl.h>
	#include <sys/debug.h>
	#include <sys/stat.h>
	#include <pthread.h>
	#include <umem.h>
	#include <time.h>

	#include <libzfs.h>
	#include <libzfs_core.h>
	#include <libzutil.h>

	#include "zfs_namecheck.h"
	#include "zfs_prop.h"
	#include "zfs_fletcher.h"
	#include "libzfs_impl.h"
	#include <cityhash.h>
	#include <zlib.h>
	#include <sys/zio_checksum.h>
	#include <sys/dsl_crypt.h>
	#include <sys/ddt.h>
	#include <sys/socket.h>
	#include <sys/sha2.h>

	static int zfs_receive_impl(libzfs_handle_t , const char , const char *,
	recvflags_t , int, const char , nvlist_t , avl_tree_t , char **,
	const char , nvlist_t );
	static int guid_to_name_redact_snaps(libzfs_handle_t hdl, const char parent,
	uint64_t guid, boolean_t bookmark_ok, uint64_t *redact_snap_guids,
	uint64_t num_redact_snaps, char *name);
	static int guid_to_name(libzfs_handle_t , const char ,
	uint64_t, boolean_t, char *);

	typedef struct progress_arg {
	zfs_handle_t *pa_zhp;
	int pa_fd;
	boolean_t pa_parsable;
	boolean_t pa_estimate;
	int pa_verbosity;
	} progress_arg_t;

	static int
	dump_record(dmu_replay_record_t drr, void payload, int payload_len,
	zio_cksum_t *zc, int outfd)
	{
	ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
	==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t));
	fletcher_4_incremental_native(drr,
	offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), zc);
	if (drr->drr_type != DRR_BEGIN) {
	ASSERT(ZIO_CHECKSUM_IS_ZERO(&drr->drr_u.
	drr_checksum.drr_checksum));
	drr->drr_u.drr_checksum.drr_checksum = *zc;
	}
	fletcher_4_incremental_native(&drr->drr_u.drr_checksum.drr_checksum,
	sizeof (zio_cksum_t), zc);
	if (write(outfd, drr, sizeof (*drr)) == -1)
	return (errno);
	if (payload_len != 0) {
	fletcher_4_incremental_native(payload, payload_len, zc);
	if (write(outfd, payload, payload_len) == -1)
	return (errno);
	}
	return (0);
	}

	/*
	* Routines for dealing with the AVL tree of fs-nvlists
	*/
	typedef struct fsavl_node {
	avl_node_t fn_node;
	nvlist_t *fn_nvfs;
	char *fn_snapname;
	uint64_t fn_guid;
	} fsavl_node_t;

	static int
	fsavl_compare(const void arg1, const void arg2)
	{
	const fsavl_node_t fn1 = (const fsavl_node_t )arg1;
	const fsavl_node_t fn2 = (const fsavl_node_t )arg2;

	return (TREE_CMP(fn1->fn_guid, fn2->fn_guid));
	}

	/*
	* Given the GUID of a snapshot, find its containing filesystem and
	* (optionally) name.
	*/
	static nvlist_t *
	fsavl_find(avl_tree_t avl, uint64_t snapguid, char *snapname)
	{
	fsavl_node_t fn_find;
	fsavl_node_t *fn;

	fn_find.fn_guid = snapguid;

	fn = avl_find(avl, &fn_find, NULL);
	if (fn) {
	if (snapname)
	*snapname = fn->fn_snapname;
	return (fn->fn_nvfs);
	}
	return (NULL);
	}

	static void
	fsavl_destroy(avl_tree_t *avl)
	{
	fsavl_node_t *fn;
	void *cookie;

	if (avl == NULL)
	return;

	cookie = NULL;
	while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL)
	free(fn);
	avl_destroy(avl);
	free(avl);
	}

	/*
	* Given an nvlist, produce an avl tree of snapshots, ordered by guid
	*/
	static avl_tree_t *
	fsavl_create(nvlist_t *fss)
	{
	avl_tree_t *fsavl;
	nvpair_t *fselem = NULL;

	if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL)
	return (NULL);

	avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t),
	offsetof(fsavl_node_t, fn_node));

	while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) {
	nvlist_t nvfs, snaps;
	nvpair_t *snapelem = NULL;

	nvfs = fnvpair_value_nvlist(fselem);
	snaps = fnvlist_lookup_nvlist(nvfs, "snaps");

	while ((snapelem =
	nvlist_next_nvpair(snaps, snapelem)) != NULL) {
	fsavl_node_t *fn;
	uint64_t guid;

	guid = fnvpair_value_uint64(snapelem);
	if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) {
	fsavl_destroy(fsavl);
	return (NULL);
	}
	fn->fn_nvfs = nvfs;
	fn->fn_snapname = nvpair_name(snapelem);
	fn->fn_guid = guid;

	/*
	* Note: if there are multiple snaps with the
	* same GUID, we ignore all but one.
	*/
	if (avl_find(fsavl, fn, NULL) == NULL)
	avl_add(fsavl, fn);
	else
	free(fn);
	}
	}

	return (fsavl);
	}

	/*
	* Routines for dealing with the giant nvlist of fs-nvlists, etc.
	*/
	typedef struct send_data {
	/*
	* assigned inside every recursive call,
	* restored from *_save on return:
	*
	* guid of fromsnap snapshot in parent dataset
	* txg of fromsnap snapshot in current dataset
	* txg of tosnap snapshot in current dataset
	*/

	uint64_t parent_fromsnap_guid;
	uint64_t fromsnap_txg;
	uint64_t tosnap_txg;

	/* the nvlists get accumulated during depth-first traversal */
	nvlist_t *parent_snaps;
	nvlist_t *fss;
	nvlist_t *snapprops;
	nvlist_t snapholds; / user holds */

	/* send-receive configuration, does not change during traversal */
	const char *fsname;
	const char *fromsnap;
	const char *tosnap;
	boolean_t recursive;
	boolean_t raw;
	boolean_t doall;
	boolean_t replicate;
	boolean_t skipmissing;
	boolean_t verbose;
	boolean_t backup;
	boolean_t seenfrom;
	boolean_t seento;
	boolean_t holds; /* were holds requested with send -h */
	boolean_t props;

	/*
	* The header nvlist is of the following format:
	* {
	* "tosnap" -> string
	* "fromsnap" -> string (if incremental)
	* "fss" -> {
	* id -> {
	*
	* "name" -> string (full name; for debugging)
	* "parentfromsnap" -> number (guid of fromsnap in parent)
	*
	* "props" -> { name -> value (only if set here) }
	* "snaps" -> { name (lastname) -> number (guid) }
	* "snapprops" -> { name (lastname) -> { name -> value } }
	* "snapholds" -> { name (lastname) -> { holdname -> crtime } }
	*
	* "origin" -> number (guid) (if clone)
	* "is_encroot" -> boolean
	* "sent" -> boolean (not on-disk)
	* }
	* }
	* }
	*
	*/
	} send_data_t;

	static void
	send_iterate_prop(zfs_handle_t zhp, boolean_t received_only, nvlist_t nv);

	static int
	send_iterate_snap(zfs_handle_t zhp, void arg)
	{
	send_data_t *sd = arg;
	uint64_t guid = zhp->zfs_dmustats.dds_guid;
	uint64_t txg = zhp->zfs_dmustats.dds_creation_txg;
	char *snapname;
	nvlist_t *nv;
	boolean_t isfromsnap, istosnap, istosnapwithnofrom;

	snapname = strrchr(zhp->zfs_name, '@')+1;
	isfromsnap = (sd->fromsnap != NULL &&
	strcmp(sd->fromsnap, snapname) == 0);
	istosnap = (sd->tosnap != NULL && (strcmp(sd->tosnap, snapname) == 0));
	istosnapwithnofrom = (istosnap && sd->fromsnap == NULL);

	if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) {
	if (sd->verbose) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"skipping snapshot %s because it was created "
	"after the destination snapshot (%s)\n"),
	zhp->zfs_name, sd->tosnap);
	}
	zfs_close(zhp);
	return (0);
	}

	fnvlist_add_uint64(sd->parent_snaps, snapname, guid);
	/*
	* NB: if there is no fromsnap here (it's a newly created fs in
	* an incremental replication), we will substitute the tosnap.
	*/
	if (isfromsnap \|\| (sd->parent_fromsnap_guid == 0 && istosnap)) {
	sd->parent_fromsnap_guid = guid;
	}

	if (!sd->recursive) {

	/*
	* To allow a doall stream to work properly
	* with a NULL fromsnap
	*/
	if (sd->doall && sd->fromsnap == NULL && !sd->seenfrom) {
	sd->seenfrom = B_TRUE;
	}

	if (!sd->seenfrom && isfromsnap) {
	sd->seenfrom = B_TRUE;
	zfs_close(zhp);
	return (0);
	}

	if ((sd->seento \|\| !sd->seenfrom) && !istosnapwithnofrom) {
	zfs_close(zhp);
	return (0);
	}

	if (istosnap)
	sd->seento = B_TRUE;
	}

	nv = fnvlist_alloc();
	send_iterate_prop(zhp, sd->backup, nv);
	fnvlist_add_nvlist(sd->snapprops, snapname, nv);
	fnvlist_free(nv);
	if (sd->holds) {
	nvlist_t *holds = fnvlist_alloc();
	int err = lzc_get_holds(zhp->zfs_name, &holds);
	if (err == 0) {
	fnvlist_add_nvlist(sd->snapholds, snapname, holds);
	}
	fnvlist_free(holds);
	}

	zfs_close(zhp);
	return (0);
	}

	static void
	send_iterate_prop(zfs_handle_t zhp, boolean_t received_only, nvlist_t nv)
	{
	nvlist_t *props = NULL;
	nvpair_t *elem = NULL;

	if (received_only)
	props = zfs_get_recvd_props(zhp);
	else
	props = zhp->zfs_props;

	while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
	char *propname = nvpair_name(elem);
	zfs_prop_t prop = zfs_name_to_prop(propname);
	nvlist_t *propnv;

	if (!zfs_prop_user(propname)) {
	/*
	* Realistically, this should never happen. However,
	* we want the ability to add DSL properties without
	* needing to make incompatible version changes. We
	* need to ignore unknown properties to allow older
	* software to still send datasets containing these
	* properties, with the unknown properties elided.
	*/
	if (prop == ZPROP_INVAL)
	continue;

	if (zfs_prop_readonly(prop))
	continue;
	}

	verify(nvpair_value_nvlist(elem, &propnv) == 0);
	if (prop == ZFS_PROP_QUOTA \|\| prop == ZFS_PROP_RESERVATION \|\|
	prop == ZFS_PROP_REFQUOTA \|\|
	prop == ZFS_PROP_REFRESERVATION) {
	char *source;
	uint64_t value;
	verify(nvlist_lookup_uint64(propnv,
	ZPROP_VALUE, &value) == 0);
	if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
	continue;
	/*
	* May have no source before SPA_VERSION_RECVD_PROPS,
	* but is still modifiable.
	*/
	if (nvlist_lookup_string(propnv,
	ZPROP_SOURCE, &source) == 0) {
	if ((strcmp(source, zhp->zfs_name) != 0) &&
	(strcmp(source,
	ZPROP_SOURCE_VAL_RECVD) != 0))
	continue;
	}
	} else {
	char *source;
	if (nvlist_lookup_string(propnv,
	ZPROP_SOURCE, &source) != 0)
	continue;
	if ((strcmp(source, zhp->zfs_name) != 0) &&
	(strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0))
	continue;
	}

	if (zfs_prop_user(propname) \|\|
	zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
	char *value;
	value = fnvlist_lookup_string(propnv, ZPROP_VALUE);
	fnvlist_add_string(nv, propname, value);
	} else {
	uint64_t value;
	value = fnvlist_lookup_uint64(propnv, ZPROP_VALUE);
	fnvlist_add_uint64(nv, propname, value);
	}
	}
	}

	/*
	* returns snapshot creation txg
	* and returns 0 if the snapshot does not exist
	*/
	static uint64_t
	get_snap_txg(libzfs_handle_t hdl, const char fs, const char *snap)
	{
	char name[ZFS_MAX_DATASET_NAME_LEN];
	uint64_t txg = 0;

	if (fs == NULL \|\| fs[0] == '\0' \|\| snap == NULL \|\| snap[0] == '\0')
	return (txg);

	(void) snprintf(name, sizeof (name), "%s@%s", fs, snap);
	if (zfs_dataset_exists(hdl, name, ZFS_TYPE_SNAPSHOT)) {
	zfs_handle_t *zhp = zfs_open(hdl, name, ZFS_TYPE_SNAPSHOT);
	if (zhp != NULL) {
	txg = zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG);
	zfs_close(zhp);
	}
	}

	return (txg);
	}

	/*
	* recursively generate nvlists describing datasets. See comment
	* for the data structure send_data_t above for description of contents
	* of the nvlist.
	*/
	static int
	send_iterate_fs(zfs_handle_t zhp, void arg)
	{
	send_data_t *sd = arg;
	nvlist_t nvfs = NULL, nv = NULL;
	int rv = 0;
	uint64_t min_txg = 0, max_txg = 0;
	uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
	uint64_t fromsnap_txg_save = sd->fromsnap_txg;
	uint64_t tosnap_txg_save = sd->tosnap_txg;
	uint64_t txg = zhp->zfs_dmustats.dds_creation_txg;
	uint64_t guid = zhp->zfs_dmustats.dds_guid;
	uint64_t fromsnap_txg, tosnap_txg;
	char guidstring[64];

	fromsnap_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, sd->fromsnap);
	if (fromsnap_txg != 0)
	sd->fromsnap_txg = fromsnap_txg;

	tosnap_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, sd->tosnap);
	if (tosnap_txg != 0)
	sd->tosnap_txg = tosnap_txg;

	/*
	* on the send side, if the current dataset does not have tosnap,
	* perform two additional checks:
	*
	* - skip sending the current dataset if it was created later than
	* the parent tosnap
	* - return error if the current dataset was created earlier than
	* the parent tosnap, unless --skip-missing specified. Then
	* just print a warning
	*/
	if (sd->tosnap != NULL && tosnap_txg == 0) {
	if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) {
	if (sd->verbose) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"skipping dataset %s: snapshot %s does "
	"not exist\n"), zhp->zfs_name, sd->tosnap);
	}
	} else if (sd->skipmissing) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"WARNING: skipping dataset %s and its children:"
	" snapshot %s does not exist\n"),
	zhp->zfs_name, sd->tosnap);
	} else {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"cannot send %s@%s%s: snapshot %s@%s does not "
	"exist\n"), sd->fsname, sd->tosnap, sd->recursive ?
	dgettext(TEXT_DOMAIN, " recursively") : "",
	zhp->zfs_name, sd->tosnap);
	rv = EZFS_NOENT;
	}
	goto out;
	}

	nvfs = fnvlist_alloc();
	fnvlist_add_string(nvfs, "name", zhp->zfs_name);
	fnvlist_add_uint64(nvfs, "parentfromsnap",
	sd->parent_fromsnap_guid);

	if (zhp->zfs_dmustats.dds_origin[0]) {
	zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
	zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
	if (origin == NULL) {
	rv = -1;
	goto out;
	}
	fnvlist_add_uint64(nvfs, "origin",
	origin->zfs_dmustats.dds_guid);

	zfs_close(origin);
	}

	/* iterate over props */
	if (sd->props \|\| sd->backup \|\| sd->recursive) {
	nv = fnvlist_alloc();
	send_iterate_prop(zhp, sd->backup, nv);
	}
	if (zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF) {
	boolean_t encroot;

	/* determine if this dataset is an encryption root */
	if (zfs_crypto_get_encryption_root(zhp, &encroot, NULL) != 0) {
	rv = -1;
	goto out;
	}

	if (encroot)
	fnvlist_add_boolean(nvfs, "is_encroot");

	/*
	* Encrypted datasets can only be sent with properties if
	* the raw flag is specified because the receive side doesn't
	* currently have a mechanism for recursively asking the user
	* for new encryption parameters.
	*/
	if (!sd->raw) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"cannot send %s@%s: encrypted dataset %s may not "
	"be sent with properties without the raw flag\n"),
	sd->fsname, sd->tosnap, zhp->zfs_name);
	rv = -1;
	goto out;
	}

	}

	if (nv != NULL)
	fnvlist_add_nvlist(nvfs, "props", nv);

	/* iterate over snaps, and set sd->parent_fromsnap_guid */
	sd->parent_fromsnap_guid = 0;
	sd->parent_snaps = fnvlist_alloc();
	sd->snapprops = fnvlist_alloc();
	if (sd->holds)
	sd->snapholds = fnvlist_alloc();

	/*
	* If this is a "doall" send, a replicate send or we're just trying
	* to gather a list of previous snapshots, iterate through all the
	* snaps in the txg range. Otherwise just look at the one we're
	* interested in.
	*/
	if (sd->doall \|\| sd->replicate \|\| sd->tosnap == NULL) {
	if (!sd->replicate && fromsnap_txg != 0)
	min_txg = fromsnap_txg;
	if (!sd->replicate && tosnap_txg != 0)
	max_txg = tosnap_txg;
	(void) zfs_iter_snapshots_sorted(zhp, send_iterate_snap, sd,
	min_txg, max_txg);
	} else {
	char snapname[MAXPATHLEN] = { 0 };
	zfs_handle_t *snap;

	(void) snprintf(snapname, sizeof (snapname), "%s@%s",
	zhp->zfs_name, sd->tosnap);
	if (sd->fromsnap != NULL)
	sd->seenfrom = B_TRUE;
	snap = zfs_open(zhp->zfs_hdl, snapname,
	ZFS_TYPE_SNAPSHOT);
	if (snap != NULL)
	(void) send_iterate_snap(snap, sd);
	}

	fnvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps);
	fnvlist_add_nvlist(nvfs, "snapprops", sd->snapprops);
	if (sd->holds)
	fnvlist_add_nvlist(nvfs, "snapholds", sd->snapholds);
	fnvlist_free(sd->parent_snaps);
	fnvlist_free(sd->snapprops);
	fnvlist_free(sd->snapholds);

	/* Do not allow the size of the properties list to exceed the limit */
	if ((fnvlist_size(nvfs) + fnvlist_size(sd->fss)) >
	zhp->zfs_hdl->libzfs_max_nvlist) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"warning: cannot send %s@%s: the size of the list of "
	"snapshots and properties is too large to be received "
	"successfully.\n"
	"Select a smaller number of snapshots to send.\n"),
	zhp->zfs_name, sd->tosnap);
	rv = EZFS_NOSPC;
	goto out;
	}
	/* add this fs to nvlist */
	(void) snprintf(guidstring, sizeof (guidstring),
	"0x%llx", (longlong_t)guid);
	fnvlist_add_nvlist(sd->fss, guidstring, nvfs);

	/* iterate over children */
	if (sd->recursive)
	rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);

	out:
	sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
	sd->fromsnap_txg = fromsnap_txg_save;
	sd->tosnap_txg = tosnap_txg_save;
	fnvlist_free(nv);
	fnvlist_free(nvfs);

	zfs_close(zhp);
	return (rv);
	}

	static int
	gather_nvlist(libzfs_handle_t hdl, const char fsname, const char *fromsnap,
	const char *tosnap, boolean_t recursive, boolean_t raw, boolean_t doall,
	boolean_t replicate, boolean_t skipmissing, boolean_t verbose,
	boolean_t backup, boolean_t holds, boolean_t props, nvlist_t **nvlp,
	avl_tree_t **avlp)
	{
	zfs_handle_t *zhp;
	send_data_t sd = { 0 };
	int error;

	zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL)
	return (EZFS_BADTYPE);

	sd.fss = fnvlist_alloc();
	sd.fsname = fsname;
	sd.fromsnap = fromsnap;
	sd.tosnap = tosnap;
	sd.recursive = recursive;
	sd.raw = raw;
	sd.doall = doall;
	sd.replicate = replicate;
	sd.skipmissing = skipmissing;
	sd.verbose = verbose;
	sd.backup = backup;
	sd.holds = holds;
	sd.props = props;

	if ((error = send_iterate_fs(zhp, &sd)) != 0) {
	fnvlist_free(sd.fss);
	if (avlp != NULL)
	*avlp = NULL;
	*nvlp = NULL;
	return (error);
	}

	if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
	fnvlist_free(sd.fss);
	*nvlp = NULL;
	return (EZFS_NOMEM);
	}

	*nvlp = sd.fss;
	return (0);
	}

	/*
	* Routines specific to "zfs send"
	*/
	typedef struct send_dump_data {
	/* these are all just the short snapname (the part after the @) */
	const char *fromsnap;
	const char *tosnap;
	char prevsnap[ZFS_MAX_DATASET_NAME_LEN];
	uint64_t prevsnap_obj;
	boolean_t seenfrom, seento, replicate, doall, fromorigin;
	boolean_t dryrun, parsable, progress, embed_data, std_out;
	boolean_t large_block, compress, raw, holds;
	int outfd;
	boolean_t err;
	nvlist_t *fss;
	nvlist_t *snapholds;
	avl_tree_t *fsavl;
	snapfilter_cb_t *filter_cb;
	void *filter_cb_arg;
	nvlist_t *debugnv;
	char holdtag[ZFS_MAX_DATASET_NAME_LEN];
	int cleanup_fd;
	int verbosity;
	uint64_t size;
	} send_dump_data_t;

	static int
	zfs_send_space(zfs_handle_t zhp, const char snapname, const char *from,
	enum lzc_send_flags flags, uint64_t *spacep)
	{
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	int error;

	assert(snapname != NULL);
	error = lzc_send_space(snapname, from, flags, spacep);

	if (error != 0) {
	char errbuf[1024];
	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"warning: cannot estimate space for '%s'"), snapname);

	switch (error) {
	case EXDEV:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"not an earlier snapshot from the same fs"));
	return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));

	case ENOENT:
	if (zfs_dataset_exists(hdl, snapname,
	ZFS_TYPE_SNAPSHOT)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incremental source (%s) does not exist"),
	snapname);
	}
	return (zfs_error(hdl, EZFS_NOENT, errbuf));

	case EDQUOT:
	case EFBIG:
	case EIO:
	case ENOLINK:
	case ENOSPC:
	case ENOSTR:
	case ENXIO:
	case EPIPE:
	case ERANGE:
	case EFAULT:
	case EROFS:
	case EINVAL:
	zfs_error_aux(hdl, "%s", strerror(error));
	return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));

	default:
	return (zfs_standard_error(hdl, error, errbuf));
	}
	}

	return (0);
	}

	/*
	* Dumps a backup of the given snapshot (incremental from fromsnap if it's not
	* NULL) to the file descriptor specified by outfd.
	*/
	static int
	dump_ioctl(zfs_handle_t zhp, const char fromsnap, uint64_t fromsnap_obj,
	boolean_t fromorigin, int outfd, enum lzc_send_flags flags,
	nvlist_t *debugnv)
	{
	zfs_cmd_t zc = {"\0"};
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	nvlist_t *thisdbg;

	assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
	assert(fromsnap_obj == 0 \|\| !fromorigin);

	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
	zc.zc_cookie = outfd;
	zc.zc_obj = fromorigin;
	zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
	zc.zc_fromobj = fromsnap_obj;
	zc.zc_flags = flags;

	thisdbg = fnvlist_alloc();
	if (fromsnap && fromsnap[0] != '\0') {
	fnvlist_add_string(thisdbg, "fromsnap", fromsnap);
	}

	if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
	char errbuf[1024];
	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"warning: cannot send '%s'"), zhp->zfs_name);

	fnvlist_add_uint64(thisdbg, "error", errno);
	if (debugnv) {
	fnvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg);
	}
	fnvlist_free(thisdbg);

	switch (errno) {
	case EXDEV:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"not an earlier snapshot from the same fs"));
	return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));

	case EACCES:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"source key must be loaded"));
	return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));

	case ENOENT:
	if (zfs_dataset_exists(hdl, zc.zc_name,
	ZFS_TYPE_SNAPSHOT)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incremental source (@%s) does not exist"),
	zc.zc_value);
	}
	return (zfs_error(hdl, EZFS_NOENT, errbuf));

	case EDQUOT:
	case EFBIG:
	case EIO:
	case ENOLINK:
	case ENOSPC:
	case ENOSTR:
	case ENXIO:
	case EPIPE:
	case ERANGE:
	case EFAULT:
	case EROFS:
	case EINVAL:
	zfs_error_aux(hdl, "%s", strerror(errno));
	return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));

	default:
	return (zfs_standard_error(hdl, errno, errbuf));
	}
	}

	if (debugnv)
	fnvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg);
	fnvlist_free(thisdbg);

	return (0);
	}

	static void
	gather_holds(zfs_handle_t zhp, send_dump_data_t sdd)
	{
	assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);

	/*
	* zfs_send() only sets snapholds for sends that need them,
	* e.g. replication and doall.
	*/
	if (sdd->snapholds == NULL)
	return;

	fnvlist_add_string(sdd->snapholds, zhp->zfs_name, sdd->holdtag);
	}

	int
	zfs_send_progress(zfs_handle_t zhp, int fd, uint64_t bytes_written,
	uint64_t *blocks_visited)
	{
	zfs_cmd_t zc = {"\0"};

	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
	zc.zc_cookie = fd;
	if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND_PROGRESS, &zc) != 0)
	return (errno);
	if (bytes_written != NULL)
	*bytes_written = zc.zc_cookie;
	if (blocks_visited != NULL)
	*blocks_visited = zc.zc_objset_type;
	return (0);
	}

	static void *
	send_progress_thread(void *arg)
	{
	progress_arg_t *pa = arg;
	zfs_handle_t *zhp = pa->pa_zhp;
	uint64_t bytes;
	uint64_t blocks;
	char buf[16];
	time_t t;
	struct tm *tm;
	boolean_t firstloop = B_TRUE;

	/*
	* Print the progress from ZFS_IOC_SEND_PROGRESS every second.
	*/
	for (;;) {
	int err;
	(void) sleep(1);
	if ((err = zfs_send_progress(zhp, pa->pa_fd, &bytes,
	&blocks)) != 0) {
	if (err == EINTR \|\| err == ENOENT)
	return ((void *)0);
	return ((void *)(uintptr_t)err);
	}

	if (firstloop && !pa->pa_parsable) {
	(void) fprintf(stderr,
	"TIME %s %sSNAPSHOT %s\n",
	pa->pa_estimate ? "BYTES" : " SENT",
	pa->pa_verbosity >= 2 ? " BLOCKS " : "",
	zhp->zfs_name);
	firstloop = B_FALSE;
	}

	(void) time(&t);
	tm = localtime(&t);

	if (pa->pa_verbosity >= 2 && pa->pa_parsable) {
	(void) fprintf(stderr,
	"%02d:%02d:%02d\t%llu\t%llu\t%s\n",
	tm->tm_hour, tm->tm_min, tm->tm_sec,
	(u_longlong_t)bytes, (u_longlong_t)blocks,
	zhp->zfs_name);
	} else if (pa->pa_verbosity >= 2) {
	zfs_nicenum(bytes, buf, sizeof (buf));
	(void) fprintf(stderr,
	"%02d:%02d:%02d %5s %8llu %s\n",
	tm->tm_hour, tm->tm_min, tm->tm_sec,
	buf, (u_longlong_t)blocks, zhp->zfs_name);
	} else if (pa->pa_parsable) {
	(void) fprintf(stderr, "%02d:%02d:%02d\t%llu\t%s\n",
	tm->tm_hour, tm->tm_min, tm->tm_sec,
	(u_longlong_t)bytes, zhp->zfs_name);
	} else {
	zfs_nicebytes(bytes, buf, sizeof (buf));
	(void) fprintf(stderr, "%02d:%02d:%02d %5s %s\n",
	tm->tm_hour, tm->tm_min, tm->tm_sec,
	buf, zhp->zfs_name);
	}
	}
	}

	static void
	send_print_verbose(FILE fout, const char tosnap, const char *fromsnap,
	uint64_t size, boolean_t parsable)
	{
	if (parsable) {
	if (fromsnap != NULL) {
	(void) fprintf(fout, "incremental\t%s\t%s",
	fromsnap, tosnap);
	} else {
	(void) fprintf(fout, "full\t%s",
	tosnap);
	}
	} else {
	if (fromsnap != NULL) {
	if (strchr(fromsnap, '@') == NULL &&
	strchr(fromsnap, '#') == NULL) {
	(void) fprintf(fout, dgettext(TEXT_DOMAIN,
	"send from @%s to %s"),
	fromsnap, tosnap);
	} else {
	(void) fprintf(fout, dgettext(TEXT_DOMAIN,
	"send from %s to %s"),
	fromsnap, tosnap);
	}
	} else {
	(void) fprintf(fout, dgettext(TEXT_DOMAIN,
	"full send of %s"),
	tosnap);
	}
	}

	if (parsable) {
	(void) fprintf(fout, "\t%llu",
	(longlong_t)size);
	} else if (size != 0) {
	char buf[16];
	zfs_nicebytes(size, buf, sizeof (buf));
	(void) fprintf(fout, dgettext(TEXT_DOMAIN,
	" estimated size is %s"), buf);
	}
	(void) fprintf(fout, "\n");
	}

	static int
	dump_snapshot(zfs_handle_t zhp, void arg)
	{
	send_dump_data_t *sdd = arg;
	progress_arg_t pa = { 0 };
	pthread_t tid;
	char *thissnap;
	enum lzc_send_flags flags = 0;
	int err;
	boolean_t isfromsnap, istosnap, fromorigin;
	boolean_t exclude = B_FALSE;
	FILE *fout = sdd->std_out ? stdout : stderr;

	err = 0;
	thissnap = strchr(zhp->zfs_name, '@') + 1;
	isfromsnap = (sdd->fromsnap != NULL &&
	strcmp(sdd->fromsnap, thissnap) == 0);

	if (!sdd->seenfrom && isfromsnap) {
	gather_holds(zhp, sdd);
	sdd->seenfrom = B_TRUE;
	(void) strlcpy(sdd->prevsnap, thissnap,
	sizeof (sdd->prevsnap));
	sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
	zfs_close(zhp);
	return (0);
	}

	if (sdd->seento \|\| !sdd->seenfrom) {
	zfs_close(zhp);
	return (0);
	}

	istosnap = (strcmp(sdd->tosnap, thissnap) == 0);
	if (istosnap)
	sdd->seento = B_TRUE;

	if (sdd->large_block)
	flags \|= LZC_SEND_FLAG_LARGE_BLOCK;
	if (sdd->embed_data)
	flags \|= LZC_SEND_FLAG_EMBED_DATA;
	if (sdd->compress)
	flags \|= LZC_SEND_FLAG_COMPRESS;
	if (sdd->raw)
	flags \|= LZC_SEND_FLAG_RAW;

	if (!sdd->doall && !isfromsnap && !istosnap) {
	if (sdd->replicate) {
	char *snapname;
	nvlist_t *snapprops;
	/*
	* Filter out all intermediate snapshots except origin
	* snapshots needed to replicate clones.
	*/
	nvlist_t *nvfs = fsavl_find(sdd->fsavl,
	zhp->zfs_dmustats.dds_guid, &snapname);

	snapprops = fnvlist_lookup_nvlist(nvfs, "snapprops");
	snapprops = fnvlist_lookup_nvlist(snapprops, thissnap);
	exclude = !nvlist_exists(snapprops, "is_clone_origin");
	} else {
	exclude = B_TRUE;
	}
	}

	/*
	* If a filter function exists, call it to determine whether
	* this snapshot will be sent.
	*/
	if (exclude \|\| (sdd->filter_cb != NULL &&
	sdd->filter_cb(zhp, sdd->filter_cb_arg) == B_FALSE)) {
	/*
	* This snapshot is filtered out. Don't send it, and don't
	* set prevsnap_obj, so it will be as if this snapshot didn't
	* exist, and the next accepted snapshot will be sent as
	* an incremental from the last accepted one, or as the
	* first (and full) snapshot in the case of a replication,
	* non-incremental send.
	*/
	zfs_close(zhp);
	return (0);
	}

	gather_holds(zhp, sdd);
	fromorigin = sdd->prevsnap[0] == '\0' &&
	(sdd->fromorigin \|\| sdd->replicate);

	if (sdd->verbosity != 0) {
	uint64_t size = 0;
	char fromds[ZFS_MAX_DATASET_NAME_LEN];

	if (sdd->prevsnap[0] != '\0') {
	(void) strlcpy(fromds, zhp->zfs_name, sizeof (fromds));
	*(strchr(fromds, '@') + 1) = '\0';
	(void) strlcat(fromds, sdd->prevsnap, sizeof (fromds));
	}
	if (zfs_send_space(zhp, zhp->zfs_name,
	sdd->prevsnap[0] ? fromds : NULL, flags, &size) != 0) {
	size = 0; /* cannot estimate send space */
	} else {
	send_print_verbose(fout, zhp->zfs_name,
	sdd->prevsnap[0] ? sdd->prevsnap : NULL,
	size, sdd->parsable);
	}
	sdd->size += size;
	}

	if (!sdd->dryrun) {
	/*
	* If progress reporting is requested, spawn a new thread to
	* poll ZFS_IOC_SEND_PROGRESS at a regular interval.
	*/
	if (sdd->progress) {
	pa.pa_zhp = zhp;
	pa.pa_fd = sdd->outfd;
	pa.pa_parsable = sdd->parsable;
	pa.pa_estimate = B_FALSE;
	pa.pa_verbosity = sdd->verbosity;

	if ((err = pthread_create(&tid, NULL,
	send_progress_thread, &pa)) != 0) {
	zfs_close(zhp);
	return (err);
	}
	}

	err = dump_ioctl(zhp, sdd->prevsnap, sdd->prevsnap_obj,
	fromorigin, sdd->outfd, flags, sdd->debugnv);

	if (sdd->progress) {
	void *status = NULL;
	(void) pthread_cancel(tid);
	(void) pthread_join(tid, &status);
	int error = (int)(uintptr_t)status;
	if (error != 0 && status != PTHREAD_CANCELED) {
	char errbuf[1024];
	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN,
	"progress thread exited nonzero"));
	return (zfs_standard_error(zhp->zfs_hdl, error,
	errbuf));
	}
	}
	}

	(void) strcpy(sdd->prevsnap, thissnap);
	sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
	zfs_close(zhp);
	return (err);
	}

	static int
	dump_filesystem(zfs_handle_t zhp, void arg)
	{
	int rv = 0;
	send_dump_data_t *sdd = arg;
	boolean_t missingfrom = B_FALSE;
	zfs_cmd_t zc = {"\0"};
	uint64_t min_txg = 0, max_txg = 0;

	(void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
	zhp->zfs_name, sdd->tosnap);
	if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"WARNING: could not send %s@%s: does not exist\n"),
	zhp->zfs_name, sdd->tosnap);
	sdd->err = B_TRUE;
	return (0);
	}

	if (sdd->replicate && sdd->fromsnap) {
	/*
	* If this fs does not have fromsnap, and we're doing
	* recursive, we need to send a full stream from the
	* beginning (or an incremental from the origin if this
	* is a clone). If we're doing non-recursive, then let
	* them get the error.
	*/
	(void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
	zhp->zfs_name, sdd->fromsnap);
	if (zfs_ioctl(zhp->zfs_hdl,
	ZFS_IOC_OBJSET_STATS, &zc) != 0) {
	missingfrom = B_TRUE;
	}
	}

	sdd->seenfrom = sdd->seento = sdd->prevsnap[0] = 0;
	sdd->prevsnap_obj = 0;
	if (sdd->fromsnap == NULL \|\| missingfrom)
	sdd->seenfrom = B_TRUE;



	/*
	* Iterate through all snapshots and process the ones we will be
	* sending. If we only have a "from" and "to" snapshot to deal
	* with, we can avoid iterating through all the other snapshots.
	*/
	if (sdd->doall \|\| sdd->replicate \|\| sdd->tosnap == NULL) {
	if (!sdd->replicate && sdd->fromsnap != NULL)
	min_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name,
	sdd->fromsnap);
	if (!sdd->replicate && sdd->tosnap != NULL)
	max_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name,
	sdd->tosnap);
	rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg,
	min_txg, max_txg);
	} else {
	char snapname[MAXPATHLEN] = { 0 };
	zfs_handle_t *snap;

	if (!sdd->seenfrom) {
	(void) snprintf(snapname, sizeof (snapname),
	"%s@%s", zhp->zfs_name, sdd->fromsnap);
	snap = zfs_open(zhp->zfs_hdl, snapname,
	ZFS_TYPE_SNAPSHOT);
	if (snap != NULL)
	rv = dump_snapshot(snap, sdd);
	else
	rv = -1;
	}

	if (rv == 0) {
	(void) snprintf(snapname, sizeof (snapname),
	"%s@%s", zhp->zfs_name, sdd->tosnap);
	snap = zfs_open(zhp->zfs_hdl, snapname,
	ZFS_TYPE_SNAPSHOT);
	if (snap != NULL)
	rv = dump_snapshot(snap, sdd);
	else
	rv = -1;
	}
	}

	if (!sdd->seenfrom) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"WARNING: could not send %s@%s:\n"
	"incremental source (%s@%s) does not exist\n"),
	zhp->zfs_name, sdd->tosnap,
	zhp->zfs_name, sdd->fromsnap);
	sdd->err = B_TRUE;
	} else if (!sdd->seento) {
	if (sdd->fromsnap) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"WARNING: could not send %s@%s:\n"
	"incremental source (%s@%s) "
	"is not earlier than it\n"),
	zhp->zfs_name, sdd->tosnap,
	zhp->zfs_name, sdd->fromsnap);
	} else {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"WARNING: "
	"could not send %s@%s: does not exist\n"),
	zhp->zfs_name, sdd->tosnap);
	}
	sdd->err = B_TRUE;
	}

	return (rv);
	}

	static int
	dump_filesystems(zfs_handle_t rzhp, void arg)
	{
	send_dump_data_t *sdd = arg;
	nvpair_t *fspair;
	boolean_t needagain, progress;

	if (!sdd->replicate)
	return (dump_filesystem(rzhp, sdd));

	/* Mark the clone origin snapshots. */
	for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
	fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
	nvlist_t *nvfs;
	uint64_t origin_guid = 0;

	nvfs = fnvpair_value_nvlist(fspair);
	(void) nvlist_lookup_uint64(nvfs, "origin", &origin_guid);
	if (origin_guid != 0) {
	char *snapname;
	nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
	origin_guid, &snapname);
	if (origin_nv != NULL) {
	nvlist_t *snapprops;
	snapprops = fnvlist_lookup_nvlist(origin_nv,
	"snapprops");
	snapprops = fnvlist_lookup_nvlist(snapprops,
	snapname);
	fnvlist_add_boolean(snapprops,
	"is_clone_origin");
	}
	}
	}
	again:
	needagain = progress = B_FALSE;
	for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
	fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
	nvlist_t fslist, parent_nv;
	char *fsname;
	zfs_handle_t *zhp;
	int err;
	uint64_t origin_guid = 0;
	uint64_t parent_guid = 0;

	fslist = fnvpair_value_nvlist(fspair);
	if (nvlist_lookup_boolean(fslist, "sent") == 0)
	continue;

	fsname = fnvlist_lookup_string(fslist, "name");
	(void) nvlist_lookup_uint64(fslist, "origin", &origin_guid);
	(void) nvlist_lookup_uint64(fslist, "parentfromsnap",
	&parent_guid);

	if (parent_guid != 0) {
	parent_nv = fsavl_find(sdd->fsavl, parent_guid, NULL);
	if (!nvlist_exists(parent_nv, "sent")) {
	/* parent has not been sent; skip this one */
	needagain = B_TRUE;
	continue;
	}
	}

	if (origin_guid != 0) {
	nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
	origin_guid, NULL);
	if (origin_nv != NULL &&
	!nvlist_exists(origin_nv, "sent")) {
	/*
	* origin has not been sent yet;
	* skip this clone.
	*/
	needagain = B_TRUE;
	continue;
	}
	}

	zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
	if (zhp == NULL)
	return (-1);
	err = dump_filesystem(zhp, sdd);
	fnvlist_add_boolean(fslist, "sent");
	progress = B_TRUE;
	zfs_close(zhp);
	if (err)
	return (err);
	}
	if (needagain) {
	assert(progress);
	goto again;
	}

	/* clean out the sent flags in case we reuse this fss */
	for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
	fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
	nvlist_t *fslist;

	fslist = fnvpair_value_nvlist(fspair);
	(void) nvlist_remove_all(fslist, "sent");
	}

	return (0);
	}

	nvlist_t *
	zfs_send_resume_token_to_nvlist(libzfs_handle_t hdl, const char token)
	{
	unsigned int version;
	int nread, i;
	unsigned long long checksum, packed_len;

	/*
	* Decode token header, which is:
	* <token version>-<checksum of payload>-<uncompressed payload length>
	* Note that the only supported token version is 1.
	*/
	nread = sscanf(token, "%u-%llx-%llx-",
	&version, &checksum, &packed_len);
	if (nread != 3) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"resume token is corrupt (invalid format)"));
	return (NULL);
	}

	if (version != ZFS_SEND_RESUME_TOKEN_VERSION) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"resume token is corrupt (invalid version %u)"),
	version);
	return (NULL);
	}

	/* convert hexadecimal representation to binary */
	token = strrchr(token, '-') + 1;
	int len = strlen(token) / 2;
	unsigned char *compressed = zfs_alloc(hdl, len);
	for (i = 0; i < len; i++) {
	nread = sscanf(token + i * 2, "%2hhx", compressed + i);
	if (nread != 1) {
	free(compressed);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"resume token is corrupt "
	"(payload is not hex-encoded)"));
	return (NULL);
	}
	}

	/* verify checksum */
	zio_cksum_t cksum;
	fletcher_4_native_varsize(compressed, len, &cksum);
	if (cksum.zc_word[0] != checksum) {
	free(compressed);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"resume token is corrupt (incorrect checksum)"));
	return (NULL);
	}

	/* uncompress */
	void *packed = zfs_alloc(hdl, packed_len);
	uLongf packed_len_long = packed_len;
	if (uncompress(packed, &packed_len_long, compressed, len) != Z_OK \|\|
	packed_len_long != packed_len) {
	free(packed);
	free(compressed);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"resume token is corrupt (decompression failed)"));
	return (NULL);
	}

	/* unpack nvlist */
	nvlist_t *nv;
	int error = nvlist_unpack(packed, packed_len, &nv, KM_SLEEP);
	free(packed);
	free(compressed);
	if (error != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"resume token is corrupt (nvlist_unpack failed)"));
	return (NULL);
	}
	return (nv);
	}
	static enum lzc_send_flags
	lzc_flags_from_sendflags(const sendflags_t *flags)
	{
	enum lzc_send_flags lzc_flags = 0;
	if (flags->largeblock)
	lzc_flags \|= LZC_SEND_FLAG_LARGE_BLOCK;
	if (flags->embed_data)
	lzc_flags \|= LZC_SEND_FLAG_EMBED_DATA;
	if (flags->compress)
	lzc_flags \|= LZC_SEND_FLAG_COMPRESS;
	if (flags->raw)
	lzc_flags \|= LZC_SEND_FLAG_RAW;
	if (flags->saved)
	lzc_flags \|= LZC_SEND_FLAG_SAVED;
	return (lzc_flags);
	}

	static int
	estimate_size(zfs_handle_t zhp, const char from, int fd, sendflags_t *flags,
	uint64_t resumeobj, uint64_t resumeoff, uint64_t bytes,
	const char redactbook, char errbuf)
	{
	uint64_t size;
	FILE *fout = flags->dryrun ? stdout : stderr;
	progress_arg_t pa = { 0 };
	int err = 0;
	pthread_t ptid;

	if (flags->progress) {
	pa.pa_zhp = zhp;
	pa.pa_fd = fd;
	pa.pa_parsable = flags->parsable;
	pa.pa_estimate = B_TRUE;
	pa.pa_verbosity = flags->verbosity;

	err = pthread_create(&ptid, NULL,
	send_progress_thread, &pa);
	if (err != 0) {
	zfs_error_aux(zhp->zfs_hdl, "%s", strerror(errno));
	return (zfs_error(zhp->zfs_hdl,
	EZFS_THREADCREATEFAILED, errbuf));
	}
	}

	err = lzc_send_space_resume_redacted(zhp->zfs_name, from,
	lzc_flags_from_sendflags(flags), resumeobj, resumeoff, bytes,
	redactbook, fd, &size);

	if (flags->progress) {
	void *status = NULL;
	(void) pthread_cancel(ptid);
	(void) pthread_join(ptid, &status);
	int error = (int)(uintptr_t)status;
	if (error != 0 && status != PTHREAD_CANCELED) {
	char errbuf[1024];
	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN, "progress thread exited "
	"nonzero"));
	return (zfs_standard_error(zhp->zfs_hdl, error,
	errbuf));
	}
	}

	if (err != 0) {
	zfs_error_aux(zhp->zfs_hdl, "%s", strerror(err));
	return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
	errbuf));
	}
	send_print_verbose(fout, zhp->zfs_name, from, size,
	flags->parsable);

	if (flags->parsable) {
	(void) fprintf(fout, "size\t%llu\n", (longlong_t)size);
	} else {
	char buf[16];
	zfs_nicenum(size, buf, sizeof (buf));
	(void) fprintf(fout, dgettext(TEXT_DOMAIN,
	"total estimated size is %s\n"), buf);
	}
	return (0);
	}

	static boolean_t
	redact_snaps_contains(const uint64_t *snaps, uint64_t num_snaps, uint64_t guid)
	{
	for (int i = 0; i < num_snaps; i++) {
	if (snaps[i] == guid)
	return (B_TRUE);
	}
	return (B_FALSE);
	}

	static boolean_t
	redact_snaps_equal(const uint64_t *snaps1, uint64_t num_snaps1,
	const uint64_t *snaps2, uint64_t num_snaps2)
	{
	if (num_snaps1 != num_snaps2)
	return (B_FALSE);
	for (int i = 0; i < num_snaps1; i++) {
	if (!redact_snaps_contains(snaps2, num_snaps2, snaps1[i]))
	return (B_FALSE);
	}
	return (B_TRUE);
	}

	/*
	* Check that the list of redaction snapshots in the bookmark matches the send
	* we're resuming, and return whether or not it's complete.
	*
	* Note that the caller needs to free the contents of *bookname with free() if
	* this function returns successfully.
	*/
	static int
	find_redact_book(libzfs_handle_t hdl, const char path,
	const uint64_t *redact_snap_guids, int num_redact_snaps,
	char **bookname)
	{
	char errbuf[1024];
	int error = 0;
	nvlist_t *props = fnvlist_alloc();
	nvlist_t *bmarks;

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot resume send"));

	fnvlist_add_boolean(props, "redact_complete");
	fnvlist_add_boolean(props, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS));
	error = lzc_get_bookmarks(path, props, &bmarks);
	fnvlist_free(props);
	if (error != 0) {
	if (error == ESRCH) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"nonexistent redaction bookmark provided"));
	} else if (error == ENOENT) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"dataset to be sent no longer exists"));
	} else {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"unknown error: %s"), strerror(error));
	}
	return (zfs_error(hdl, EZFS_BADPROP, errbuf));
	}
	nvpair_t *pair;
	for (pair = nvlist_next_nvpair(bmarks, NULL); pair;
	pair = nvlist_next_nvpair(bmarks, pair)) {

	nvlist_t *bmark = fnvpair_value_nvlist(pair);
	nvlist_t *vallist = fnvlist_lookup_nvlist(bmark,
	zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS));
	uint_t len = 0;
	uint64_t *bmarksnaps = fnvlist_lookup_uint64_array(vallist,
	ZPROP_VALUE, &len);
	if (redact_snaps_equal(redact_snap_guids,
	num_redact_snaps, bmarksnaps, len)) {
	break;
	}
	}
	if (pair == NULL) {
	fnvlist_free(bmarks);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"no appropriate redaction bookmark exists"));
	return (zfs_error(hdl, EZFS_BADPROP, errbuf));
	}
	char *name = nvpair_name(pair);
	nvlist_t *bmark = fnvpair_value_nvlist(pair);
	nvlist_t *vallist = fnvlist_lookup_nvlist(bmark, "redact_complete");
	boolean_t complete = fnvlist_lookup_boolean_value(vallist,
	ZPROP_VALUE);
	if (!complete) {
	fnvlist_free(bmarks);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incomplete redaction bookmark provided"));
	return (zfs_error(hdl, EZFS_BADPROP, errbuf));
	}
	*bookname = strndup(name, ZFS_MAX_DATASET_NAME_LEN);
	ASSERT3P(*bookname, !=, NULL);
	fnvlist_free(bmarks);
	return (0);
	}

	static int
	zfs_send_resume_impl(libzfs_handle_t hdl, sendflags_t flags, int outfd,
	nvlist_t *resume_nvl)
	{
	char errbuf[1024];
	char *toname;
	char *fromname = NULL;
	uint64_t resumeobj, resumeoff, toguid, fromguid, bytes;
	zfs_handle_t *zhp;
	int error = 0;
	char name[ZFS_MAX_DATASET_NAME_LEN];
	enum lzc_send_flags lzc_flags = 0;
	FILE *fout = (flags->verbosity > 0 && flags->dryrun) ? stdout : stderr;
	uint64_t *redact_snap_guids = NULL;
	int num_redact_snaps = 0;
	char *redact_book = NULL;

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot resume send"));

	if (flags->verbosity != 0) {
	(void) fprintf(fout, dgettext(TEXT_DOMAIN,
	"resume token contents:\n"));
	nvlist_print(fout, resume_nvl);
	}

	if (nvlist_lookup_string(resume_nvl, "toname", &toname) != 0 \|\|
	nvlist_lookup_uint64(resume_nvl, "object", &resumeobj) != 0 \|\|
	nvlist_lookup_uint64(resume_nvl, "offset", &resumeoff) != 0 \|\|
	nvlist_lookup_uint64(resume_nvl, "bytes", &bytes) != 0 \|\|
	nvlist_lookup_uint64(resume_nvl, "toguid", &toguid) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"resume token is corrupt"));
	return (zfs_error(hdl, EZFS_FAULT, errbuf));
	}
	fromguid = 0;
	(void) nvlist_lookup_uint64(resume_nvl, "fromguid", &fromguid);

	if (flags->largeblock \|\| nvlist_exists(resume_nvl, "largeblockok"))
	lzc_flags \|= LZC_SEND_FLAG_LARGE_BLOCK;
	if (flags->embed_data \|\| nvlist_exists(resume_nvl, "embedok"))
	lzc_flags \|= LZC_SEND_FLAG_EMBED_DATA;
	if (flags->compress \|\| nvlist_exists(resume_nvl, "compressok"))
	lzc_flags \|= LZC_SEND_FLAG_COMPRESS;
	if (flags->raw \|\| nvlist_exists(resume_nvl, "rawok"))
	lzc_flags \|= LZC_SEND_FLAG_RAW;
	if (flags->saved \|\| nvlist_exists(resume_nvl, "savedok"))
	lzc_flags \|= LZC_SEND_FLAG_SAVED;

	if (flags->saved) {
	(void) strcpy(name, toname);
	} else {
	error = guid_to_name(hdl, toname, toguid, B_FALSE, name);
	if (error != 0) {
	if (zfs_dataset_exists(hdl, toname, ZFS_TYPE_DATASET)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"'%s' is no longer the same snapshot "
	"used in the initial send"), toname);
	} else {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"'%s' used in the initial send no "
	"longer exists"), toname);
	}
	return (zfs_error(hdl, EZFS_BADPATH, errbuf));
	}
	}

	zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
	if (zhp == NULL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"unable to access '%s'"), name);
	return (zfs_error(hdl, EZFS_BADPATH, errbuf));
	}

	if (nvlist_lookup_uint64_array(resume_nvl, "book_redact_snaps",
	&redact_snap_guids, (uint_t *)&num_redact_snaps) != 0) {
	num_redact_snaps = -1;
	}

	if (fromguid != 0) {
	if (guid_to_name_redact_snaps(hdl, toname, fromguid, B_TRUE,
	redact_snap_guids, num_redact_snaps, name) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incremental source %#llx no longer exists"),
	(longlong_t)fromguid);
	return (zfs_error(hdl, EZFS_BADPATH, errbuf));
	}
	fromname = name;
	}

	redact_snap_guids = NULL;

	if (nvlist_lookup_uint64_array(resume_nvl,
	zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), &redact_snap_guids,
	(uint_t *)&num_redact_snaps) == 0) {
	char path[ZFS_MAX_DATASET_NAME_LEN];

	(void) strlcpy(path, toname, sizeof (path));
	char *at = strchr(path, '@');
	ASSERT3P(at, !=, NULL);

	*at = '\0';

	if ((error = find_redact_book(hdl, path, redact_snap_guids,
	num_redact_snaps, &redact_book)) != 0) {
	return (error);
	}
	}

	if (flags->verbosity != 0) {
	/*
	* Some of these may have come from the resume token, set them
	* here for size estimate purposes.
	*/
	sendflags_t tmpflags = *flags;
	if (lzc_flags & LZC_SEND_FLAG_LARGE_BLOCK)
	tmpflags.largeblock = B_TRUE;
	if (lzc_flags & LZC_SEND_FLAG_COMPRESS)
	tmpflags.compress = B_TRUE;
	if (lzc_flags & LZC_SEND_FLAG_EMBED_DATA)
	tmpflags.embed_data = B_TRUE;
	if (lzc_flags & LZC_SEND_FLAG_RAW)
	tmpflags.raw = B_TRUE;
	if (lzc_flags & LZC_SEND_FLAG_SAVED)
	tmpflags.saved = B_TRUE;
	error = estimate_size(zhp, fromname, outfd, &tmpflags,
	resumeobj, resumeoff, bytes, redact_book, errbuf);
	}

	if (!flags->dryrun) {
	progress_arg_t pa = { 0 };
	pthread_t tid;
	/*
	* If progress reporting is requested, spawn a new thread to
	* poll ZFS_IOC_SEND_PROGRESS at a regular interval.
	*/
	if (flags->progress) {
	pa.pa_zhp = zhp;
	pa.pa_fd = outfd;
	pa.pa_parsable = flags->parsable;
	pa.pa_estimate = B_FALSE;
	pa.pa_verbosity = flags->verbosity;

	error = pthread_create(&tid, NULL,
	send_progress_thread, &pa);
	if (error != 0) {
	if (redact_book != NULL)
	free(redact_book);
	zfs_close(zhp);
	return (error);
	}
	}

	error = lzc_send_resume_redacted(zhp->zfs_name, fromname, outfd,
	lzc_flags, resumeobj, resumeoff, redact_book);
	if (redact_book != NULL)
	free(redact_book);

	if (flags->progress) {
	void *status = NULL;
	(void) pthread_cancel(tid);
	(void) pthread_join(tid, &status);
	int error = (int)(uintptr_t)status;
	if (error != 0 && status != PTHREAD_CANCELED) {
	char errbuf[1024];
	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN,
	"progress thread exited nonzero"));
	return (zfs_standard_error(hdl, error, errbuf));
	}
	}

	char errbuf[1024];
	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"warning: cannot send '%s'"), zhp->zfs_name);

	zfs_close(zhp);

	switch (error) {
	case 0:
	return (0);
	case EACCES:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"source key must be loaded"));
	return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));
	case ESRCH:
	if (lzc_exists(zhp->zfs_name)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incremental source could not be found"));
	}
	return (zfs_error(hdl, EZFS_NOENT, errbuf));

	case EXDEV:
	case ENOENT:
	case EDQUOT:
	case EFBIG:
	case EIO:
	case ENOLINK:
	case ENOSPC:
	case ENOSTR:
	case ENXIO:
	case EPIPE:
	case ERANGE:
	case EFAULT:
	case EROFS:
	zfs_error_aux(hdl, "%s", strerror(errno));
	return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));

	default:
	return (zfs_standard_error(hdl, errno, errbuf));
	}
	} else {
	if (redact_book != NULL)
	free(redact_book);
	}

	zfs_close(zhp);

	return (error);
	}

	int
	zfs_send_resume(libzfs_handle_t hdl, sendflags_t flags, int outfd,
	const char *resume_token)
	{
	int ret;
	char errbuf[1024];
	nvlist_t *resume_nvl;

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot resume send"));

	resume_nvl = zfs_send_resume_token_to_nvlist(hdl, resume_token);
	if (resume_nvl == NULL) {
	/*
	* zfs_error_aux has already been set by
	* zfs_send_resume_token_to_nvlist()
	*/
	return (zfs_error(hdl, EZFS_FAULT, errbuf));
	}

	ret = zfs_send_resume_impl(hdl, flags, outfd, resume_nvl);
	fnvlist_free(resume_nvl);

	return (ret);
	}

	int
	zfs_send_saved(zfs_handle_t zhp, sendflags_t flags, int outfd,
	const char *resume_token)
	{
	int ret;
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	nvlist_t saved_nvl = NULL, resume_nvl = NULL;
	uint64_t saved_guid = 0, resume_guid = 0;
	uint64_t obj = 0, off = 0, bytes = 0;
	char token_buf[ZFS_MAXPROPLEN];
	char errbuf[1024];

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"saved send failed"));

	ret = zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
	token_buf, sizeof (token_buf), NULL, NULL, 0, B_TRUE);
	if (ret != 0)
	goto out;

	saved_nvl = zfs_send_resume_token_to_nvlist(hdl, token_buf);
	if (saved_nvl == NULL) {
	/*
	* zfs_error_aux has already been set by
	* zfs_send_resume_token_to_nvlist()
	*/
	ret = zfs_error(hdl, EZFS_FAULT, errbuf);
	goto out;
	}

	/*
	* If a resume token is provided we use the object and offset
	* from that instead of the default, which starts from the
	* beginning.
	*/
	if (resume_token != NULL) {
	resume_nvl = zfs_send_resume_token_to_nvlist(hdl,
	resume_token);
	if (resume_nvl == NULL) {
	ret = zfs_error(hdl, EZFS_FAULT, errbuf);
	goto out;
	}

	if (nvlist_lookup_uint64(resume_nvl, "object", &obj) != 0 \|\|
	nvlist_lookup_uint64(resume_nvl, "offset", &off) != 0 \|\|
	nvlist_lookup_uint64(resume_nvl, "bytes", &bytes) != 0 \|\|
	nvlist_lookup_uint64(resume_nvl, "toguid",
	&resume_guid) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"provided resume token is corrupt"));
	ret = zfs_error(hdl, EZFS_FAULT, errbuf);
	goto out;
	}

	if (nvlist_lookup_uint64(saved_nvl, "toguid",
	&saved_guid)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"dataset's resume token is corrupt"));
	ret = zfs_error(hdl, EZFS_FAULT, errbuf);
	goto out;
	}

	if (resume_guid != saved_guid) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"provided resume token does not match dataset"));
	ret = zfs_error(hdl, EZFS_BADBACKUP, errbuf);
	goto out;
	}
	}

	(void) nvlist_remove_all(saved_nvl, "object");
	fnvlist_add_uint64(saved_nvl, "object", obj);

	(void) nvlist_remove_all(saved_nvl, "offset");
	fnvlist_add_uint64(saved_nvl, "offset", off);

	(void) nvlist_remove_all(saved_nvl, "bytes");
	fnvlist_add_uint64(saved_nvl, "bytes", bytes);

	(void) nvlist_remove_all(saved_nvl, "toname");
	fnvlist_add_string(saved_nvl, "toname", zhp->zfs_name);

	ret = zfs_send_resume_impl(hdl, flags, outfd, saved_nvl);

	out:
	fnvlist_free(saved_nvl);
	fnvlist_free(resume_nvl);
	return (ret);
	}

	/*
	* This function informs the target system that the recursive send is complete.
	* The record is also expected in the case of a send -p.
	*/
	static int
	send_conclusion_record(int fd, zio_cksum_t *zc)
	{
	dmu_replay_record_t drr = { 0 };
	drr.drr_type = DRR_END;
	if (zc != NULL)
	drr.drr_u.drr_end.drr_checksum = *zc;
	if (write(fd, &drr, sizeof (drr)) == -1) {
	return (errno);
	}
	return (0);
	}

	/*
	* This function is responsible for sending the records that contain the
	* necessary information for the target system's libzfs to be able to set the
	* properties of the filesystem being received, or to be able to prepare for
	* a recursive receive.
	*
	* The "zhp" argument is the handle of the snapshot we are sending
	* (the "tosnap"). The "from" argument is the short snapshot name (the part
	* after the @) of the incremental source.
	*/
	static int
	send_prelim_records(zfs_handle_t zhp, const char from, int fd,
	boolean_t gather_props, boolean_t recursive, boolean_t verbose,
	boolean_t dryrun, boolean_t raw, boolean_t replicate, boolean_t skipmissing,
	boolean_t backup, boolean_t holds, boolean_t props, boolean_t doall,
	nvlist_t fssp, avl_tree_t fsavlp)
	{
	int err = 0;
	char *packbuf = NULL;
	size_t buflen = 0;
	zio_cksum_t zc = { {0} };
	int featureflags = 0;
	/* name of filesystem/volume that contains snapshot we are sending */
	char tofs[ZFS_MAX_DATASET_NAME_LEN];
	/* short name of snap we are sending */
	char *tosnap = "";

	char errbuf[1024];
	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"warning: cannot send '%s'"), zhp->zfs_name);
	if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM && zfs_prop_get_int(zhp,
	ZFS_PROP_VERSION) >= ZPL_VERSION_SA) {
	featureflags \|= DMU_BACKUP_FEATURE_SA_SPILL;
	}

	if (holds)
	featureflags \|= DMU_BACKUP_FEATURE_HOLDS;

	(void) strlcpy(tofs, zhp->zfs_name, ZFS_MAX_DATASET_NAME_LEN);
	char *at = strchr(tofs, '@');
	if (at != NULL) {
	*at = '\0';
	tosnap = at + 1;
	}

	if (gather_props) {
	nvlist_t *hdrnv = fnvlist_alloc();
	nvlist_t *fss = NULL;

	if (from != NULL)
	fnvlist_add_string(hdrnv, "fromsnap", from);
	fnvlist_add_string(hdrnv, "tosnap", tosnap);
	if (!recursive)
	fnvlist_add_boolean(hdrnv, "not_recursive");

	if (raw) {
	fnvlist_add_boolean(hdrnv, "raw");
	}

	if ((err = gather_nvlist(zhp->zfs_hdl, tofs,
	from, tosnap, recursive, raw, doall, replicate, skipmissing,
	verbose, backup, holds, props, &fss, fsavlp)) != 0) {
	return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
	errbuf));
	}
	/*
	* Do not allow the size of the properties list to exceed
	* the limit
	*/
	if ((fnvlist_size(fss) + fnvlist_size(hdrnv)) >
	zhp->zfs_hdl->libzfs_max_nvlist) {
	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN, "warning: cannot send '%s': "
	"the size of the list of snapshots and properties "
	"is too large to be received successfully.\n"
	"Select a smaller number of snapshots to send.\n"),
	zhp->zfs_name);
	return (zfs_error(zhp->zfs_hdl, EZFS_NOSPC,
	errbuf));
	}
	fnvlist_add_nvlist(hdrnv, "fss", fss);
	VERIFY0(nvlist_pack(hdrnv, &packbuf, &buflen, NV_ENCODE_XDR,
	0));
	if (fssp != NULL) {
	*fssp = fss;
	} else {
	fnvlist_free(fss);
	}
	fnvlist_free(hdrnv);
	}

	if (!dryrun) {
	dmu_replay_record_t drr = { 0 };
	/* write first begin record */
	drr.drr_type = DRR_BEGIN;
	drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
	DMU_SET_STREAM_HDRTYPE(drr.drr_u.drr_begin.
	drr_versioninfo, DMU_COMPOUNDSTREAM);
	DMU_SET_FEATUREFLAGS(drr.drr_u.drr_begin.
	drr_versioninfo, featureflags);
	if (snprintf(drr.drr_u.drr_begin.drr_toname,
	sizeof (drr.drr_u.drr_begin.drr_toname), "%s@%s", tofs,
	tosnap) >= sizeof (drr.drr_u.drr_begin.drr_toname)) {
	return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
	errbuf));
	}
	drr.drr_payloadlen = buflen;

	err = dump_record(&drr, packbuf, buflen, &zc, fd);
	free(packbuf);
	if (err != 0) {
	zfs_error_aux(zhp->zfs_hdl, "%s", strerror(err));
	return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
	errbuf));
	}
	err = send_conclusion_record(fd, &zc);
	if (err != 0) {
	zfs_error_aux(zhp->zfs_hdl, "%s", strerror(err));
	return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
	errbuf));
	}
	}
	return (0);
	}

	/*
	* Generate a send stream. The "zhp" argument is the filesystem/volume
	* that contains the snapshot to send. The "fromsnap" argument is the
	* short name (the part after the '@') of the snapshot that is the
	* incremental source to send from (if non-NULL). The "tosnap" argument
	* is the short name of the snapshot to send.
	*
	* The content of the send stream is the snapshot identified by
	* 'tosnap'. Incremental streams are requested in two ways:
	* - from the snapshot identified by "fromsnap" (if non-null) or
	* - from the origin of the dataset identified by zhp, which must
	* be a clone. In this case, "fromsnap" is null and "fromorigin"
	* is TRUE.
	*
	* The send stream is recursive (i.e. dumps a hierarchy of snapshots) and
	* uses a special header (with a hdrtype field of DMU_COMPOUNDSTREAM)
	* if "replicate" is set. If "doall" is set, dump all the intermediate
	* snapshots. The DMU_COMPOUNDSTREAM header is used in the "doall"
	* case too. If "props" is set, send properties.
	*/
	int
	zfs_send(zfs_handle_t zhp, const char fromsnap, const char *tosnap,
	sendflags_t *flags, int outfd, snapfilter_cb_t filter_func,
	void cb_arg, nvlist_t *debugnvp)
	{
	char errbuf[1024];
	send_dump_data_t sdd = { 0 };
	int err = 0;
	nvlist_t *fss = NULL;
	avl_tree_t *fsavl = NULL;
	static uint64_t holdseq;
	int spa_version;
	int featureflags = 0;
	FILE *fout;

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot send '%s'"), zhp->zfs_name);

	if (fromsnap && fromsnap[0] == '\0') {
	zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
	"zero-length incremental source"));
	return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
	}

	if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM) {
	uint64_t version;
	version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
	if (version >= ZPL_VERSION_SA) {
	featureflags \|= DMU_BACKUP_FEATURE_SA_SPILL;
	}
	}

	if (flags->holds)
	featureflags \|= DMU_BACKUP_FEATURE_HOLDS;

	if (flags->replicate \|\| flags->doall \|\| flags->props \|\|
	flags->holds \|\| flags->backup) {
	char full_tosnap_name[ZFS_MAX_DATASET_NAME_LEN];
	if (snprintf(full_tosnap_name, sizeof (full_tosnap_name),
	"%s@%s", zhp->zfs_name, tosnap) >=
	sizeof (full_tosnap_name)) {
	err = EINVAL;
	goto stderr_out;
	}
	zfs_handle_t *tosnap = zfs_open(zhp->zfs_hdl,
	full_tosnap_name, ZFS_TYPE_SNAPSHOT);
	if (tosnap == NULL) {
	err = -1;
	goto err_out;
	}
	err = send_prelim_records(tosnap, fromsnap, outfd,
	flags->replicate \|\| flags->props \|\| flags->holds,
	flags->replicate, flags->verbosity > 0, flags->dryrun,
	flags->raw, flags->replicate, flags->skipmissing,
	flags->backup, flags->holds, flags->props, flags->doall,
	&fss, &fsavl);
	zfs_close(tosnap);
	if (err != 0)
	goto err_out;
	}

	/* dump each stream */
	sdd.fromsnap = fromsnap;
	sdd.tosnap = tosnap;
	sdd.outfd = outfd;
	sdd.replicate = flags->replicate;
	sdd.doall = flags->doall;
	sdd.fromorigin = flags->fromorigin;
	sdd.fss = fss;
	sdd.fsavl = fsavl;
	sdd.verbosity = flags->verbosity;
	sdd.parsable = flags->parsable;
	sdd.progress = flags->progress;
	sdd.dryrun = flags->dryrun;
	sdd.large_block = flags->largeblock;
	sdd.embed_data = flags->embed_data;
	sdd.compress = flags->compress;
	sdd.raw = flags->raw;
	sdd.holds = flags->holds;
	sdd.filter_cb = filter_func;
	sdd.filter_cb_arg = cb_arg;
	if (debugnvp)
	sdd.debugnv = *debugnvp;
	if (sdd.verbosity != 0 && sdd.dryrun)
	sdd.std_out = B_TRUE;
	fout = sdd.std_out ? stdout : stderr;

	/*
	* Some flags require that we place user holds on the datasets that are
	* being sent so they don't get destroyed during the send. We can skip
	* this step if the pool is imported read-only since the datasets cannot
	* be destroyed.
	*/
	if (!flags->dryrun && !zpool_get_prop_int(zfs_get_pool_handle(zhp),
	ZPOOL_PROP_READONLY, NULL) &&
	zfs_spa_version(zhp, &spa_version) == 0 &&
	spa_version >= SPA_VERSION_USERREFS &&
	(flags->doall \|\| flags->replicate)) {
	++holdseq;
	(void) snprintf(sdd.holdtag, sizeof (sdd.holdtag),
	".send-%d-%llu", getpid(), (u_longlong_t)holdseq);
	sdd.cleanup_fd = open(ZFS_DEV, O_RDWR \| O_CLOEXEC);
	if (sdd.cleanup_fd < 0) {
	err = errno;
	goto stderr_out;
	}
	sdd.snapholds = fnvlist_alloc();
	} else {
	sdd.cleanup_fd = -1;
	sdd.snapholds = NULL;
	}

	if (flags->verbosity != 0 \|\| sdd.snapholds != NULL) {
	/*
	* Do a verbose no-op dry run to get all the verbose output
	* or to gather snapshot hold's before generating any data,
	* then do a non-verbose real run to generate the streams.
	*/
	sdd.dryrun = B_TRUE;
	err = dump_filesystems(zhp, &sdd);

	if (err != 0)
	goto stderr_out;

	if (flags->verbosity != 0) {
	if (flags->parsable) {
	(void) fprintf(fout, "size\t%llu\n",
	(longlong_t)sdd.size);
	} else {
	char buf[16];
	zfs_nicebytes(sdd.size, buf, sizeof (buf));
	(void) fprintf(fout, dgettext(TEXT_DOMAIN,
	"total estimated size is %s\n"), buf);
	}
	}

	/* Ensure no snaps found is treated as an error. */
	if (!sdd.seento) {
	err = ENOENT;
	goto err_out;
	}

	/* Skip the second run if dryrun was requested. */
	if (flags->dryrun)
	goto err_out;

	if (sdd.snapholds != NULL) {
	err = zfs_hold_nvl(zhp, sdd.cleanup_fd, sdd.snapholds);
	if (err != 0)
	goto stderr_out;

	fnvlist_free(sdd.snapholds);
	sdd.snapholds = NULL;
	}

	sdd.dryrun = B_FALSE;
	sdd.verbosity = 0;
	}

	err = dump_filesystems(zhp, &sdd);
	fsavl_destroy(fsavl);
	fnvlist_free(fss);

	/* Ensure no snaps found is treated as an error. */
	if (err == 0 && !sdd.seento)
	err = ENOENT;

	if (sdd.cleanup_fd != -1) {
	VERIFY(0 == close(sdd.cleanup_fd));
	sdd.cleanup_fd = -1;
	}

	if (!flags->dryrun && (flags->replicate \|\| flags->doall \|\|
	flags->props \|\| flags->backup \|\| flags->holds)) {
	/*
	* write final end record. NB: want to do this even if
	* there was some error, because it might not be totally
	* failed.
	*/
	err = send_conclusion_record(outfd, NULL);
	if (err != 0)
	return (zfs_standard_error(zhp->zfs_hdl, err, errbuf));
	}

	return (err \|\| sdd.err);

	stderr_out:
	err = zfs_standard_error(zhp->zfs_hdl, err, errbuf);
	err_out:
	fsavl_destroy(fsavl);
	fnvlist_free(fss);
	fnvlist_free(sdd.snapholds);

	if (sdd.cleanup_fd != -1)
	VERIFY(0 == close(sdd.cleanup_fd));
	return (err);
	}

	static zfs_handle_t *
	name_to_dir_handle(libzfs_handle_t hdl, const char snapname)
	{
	char dirname[ZFS_MAX_DATASET_NAME_LEN];
	(void) strlcpy(dirname, snapname, ZFS_MAX_DATASET_NAME_LEN);
	char *c = strchr(dirname, '@');
	if (c != NULL)
	*c = '\0';
	return (zfs_open(hdl, dirname, ZFS_TYPE_DATASET));
	}

	/*
	* Returns B_TRUE if earlier is an earlier snapshot in later's timeline; either
	* an earlier snapshot in the same filesystem, or a snapshot before later's
	* origin, or it's origin's origin, etc.
	*/
	static boolean_t
	snapshot_is_before(zfs_handle_t earlier, zfs_handle_t later)
	{
	boolean_t ret;
	uint64_t later_txg =
	(later->zfs_type == ZFS_TYPE_FILESYSTEM \|\|
	later->zfs_type == ZFS_TYPE_VOLUME ?
	UINT64_MAX : zfs_prop_get_int(later, ZFS_PROP_CREATETXG));
	uint64_t earlier_txg = zfs_prop_get_int(earlier, ZFS_PROP_CREATETXG);

	if (earlier_txg >= later_txg)
	return (B_FALSE);

	zfs_handle_t *earlier_dir = name_to_dir_handle(earlier->zfs_hdl,
	earlier->zfs_name);
	zfs_handle_t *later_dir = name_to_dir_handle(later->zfs_hdl,
	later->zfs_name);

	if (strcmp(earlier_dir->zfs_name, later_dir->zfs_name) == 0) {
	zfs_close(earlier_dir);
	zfs_close(later_dir);
	return (B_TRUE);
	}

	char clonename[ZFS_MAX_DATASET_NAME_LEN];
	if (zfs_prop_get(later_dir, ZFS_PROP_ORIGIN, clonename,
	ZFS_MAX_DATASET_NAME_LEN, NULL, NULL, 0, B_TRUE) != 0) {
	zfs_close(earlier_dir);
	zfs_close(later_dir);
	return (B_FALSE);
	}

	zfs_handle_t *origin = zfs_open(earlier->zfs_hdl, clonename,
	ZFS_TYPE_DATASET);
	uint64_t origin_txg = zfs_prop_get_int(origin, ZFS_PROP_CREATETXG);

	/*
	* If "earlier" is exactly the origin, then
	* snapshot_is_before(earlier, origin) will return false (because
	* they're the same).
	*/
	if (origin_txg == earlier_txg &&
	strcmp(origin->zfs_name, earlier->zfs_name) == 0) {
	zfs_close(earlier_dir);
	zfs_close(later_dir);
	zfs_close(origin);
	return (B_TRUE);
	}
	zfs_close(earlier_dir);
	zfs_close(later_dir);

	ret = snapshot_is_before(earlier, origin);
	zfs_close(origin);
	return (ret);
	}

	/*
	* The "zhp" argument is the handle of the dataset to send (typically a
	* snapshot). The "from" argument is the full name of the snapshot or
	* bookmark that is the incremental source.
	*/
	int
	zfs_send_one(zfs_handle_t zhp, const char from, int fd, sendflags_t *flags,
	const char *redactbook)
	{
	int err;
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	char *name = zhp->zfs_name;
	- int orig_fd = fd;
	pthread_t ptid;
	progress_arg_t pa = { 0 };

	char errbuf[1024];
	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"warning: cannot send '%s'"), name);

	if (from != NULL && strchr(from, '@')) {
	zfs_handle_t *from_zhp = zfs_open(hdl, from,
	ZFS_TYPE_DATASET);
	if (from_zhp == NULL)
	return (-1);
	if (!snapshot_is_before(from_zhp, zhp)) {
	zfs_close(from_zhp);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"not an earlier snapshot from the same fs"));
	return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
	}
	zfs_close(from_zhp);
	}

	if (redactbook != NULL) {
	char bookname[ZFS_MAX_DATASET_NAME_LEN];
	nvlist_t *redact_snaps;
	zfs_handle_t *book_zhp;
	char at, pound;
	int dsnamelen;

	pound = strchr(redactbook, '#');
	if (pound != NULL)
	redactbook = pound + 1;
	at = strchr(name, '@');
	if (at == NULL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"cannot do a redacted send to a filesystem"));
	return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
	}
	dsnamelen = at - name;
	if (snprintf(bookname, sizeof (bookname), "%.*s#%s",
	dsnamelen, name, redactbook)
	>= sizeof (bookname)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"invalid bookmark name"));
	return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
	}
	book_zhp = zfs_open(hdl, bookname, ZFS_TYPE_BOOKMARK);
	if (book_zhp == NULL)
	return (-1);
	if (nvlist_lookup_nvlist(book_zhp->zfs_props,
	zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS),
	&redact_snaps) != 0 \|\| redact_snaps == NULL) {
	zfs_close(book_zhp);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"not a redaction bookmark"));
	return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
	}
	zfs_close(book_zhp);
	}

	/*
	* Send fs properties
	*/
	if (flags->props \|\| flags->holds \|\| flags->backup) {
	/*
	* Note: the header generated by send_prelim_records()
	* assumes that the incremental source is in the same
	* filesystem/volume as the target (which is a requirement
	* when doing "zfs send -R"). But that isn't always the
	* case here (e.g. send from snap in origin, or send from
	* bookmark). We pass from=NULL, which will omit this
	* information from the prelim records; it isn't used
	* when receiving this type of stream.
	*/
	err = send_prelim_records(zhp, NULL, fd, B_TRUE, B_FALSE,
	flags->verbosity > 0, flags->dryrun, flags->raw,
	flags->replicate, B_FALSE, flags->backup, flags->holds,
	flags->props, flags->doall, NULL, NULL);
	if (err != 0)
	return (err);
	}

	/*
	* Perform size estimate if verbose was specified.
	*/
	if (flags->verbosity != 0) {
	err = estimate_size(zhp, from, fd, flags, 0, 0, 0, redactbook,
	errbuf);
	if (err != 0)
	return (err);
	}

	if (flags->dryrun)
	return (0);

	/*
	* If progress reporting is requested, spawn a new thread to poll
	* ZFS_IOC_SEND_PROGRESS at a regular interval.
	*/
	if (flags->progress) {
	pa.pa_zhp = zhp;
	pa.pa_fd = fd;
	pa.pa_parsable = flags->parsable;
	pa.pa_estimate = B_FALSE;
	pa.pa_verbosity = flags->verbosity;

	err = pthread_create(&ptid, NULL,
	send_progress_thread, &pa);
	if (err != 0) {
	zfs_error_aux(zhp->zfs_hdl, "%s", strerror(errno));
	return (zfs_error(zhp->zfs_hdl,
	EZFS_THREADCREATEFAILED, errbuf));
	}
	}

	err = lzc_send_redacted(name, from, fd,
	lzc_flags_from_sendflags(flags), redactbook);

	if (flags->progress) {
	void *status = NULL;
	if (err != 0)
	(void) pthread_cancel(ptid);
	(void) pthread_join(ptid, &status);
	int error = (int)(uintptr_t)status;
	if (error != 0 && status != PTHREAD_CANCELED)
	return (zfs_standard_error_fmt(hdl, error,
	dgettext(TEXT_DOMAIN,
	"progress thread exited nonzero")));
	}

	if (flags->props \|\| flags->holds \|\| flags->backup) {
	/* Write the final end record. */
	- err = send_conclusion_record(orig_fd, NULL);
	+ err = send_conclusion_record(fd, NULL);
	if (err != 0)
	return (zfs_standard_error(hdl, err, errbuf));
	}
	if (err != 0) {
	switch (errno) {
	case EXDEV:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"not an earlier snapshot from the same fs"));
	return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));

	case ENOENT:
	case ESRCH:
	if (lzc_exists(name)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incremental source (%s) does not exist"),
	from);
	}
	return (zfs_error(hdl, EZFS_NOENT, errbuf));

	case EACCES:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"dataset key must be loaded"));
	return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));

	case EBUSY:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"target is busy; if a filesystem, "
	"it must not be mounted"));
	return (zfs_error(hdl, EZFS_BUSY, errbuf));

	case EDQUOT:
	case EFAULT:
	case EFBIG:
	case EINVAL:
	case EIO:
	case ENOLINK:
	case ENOSPC:
	case ENOSTR:
	case ENXIO:
	case EPIPE:
	case ERANGE:
	case EROFS:
	zfs_error_aux(hdl, "%s", strerror(errno));
	return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));

	default:
	return (zfs_standard_error(hdl, errno, errbuf));
	}
	}
	return (err != 0);
	}

	/*
	* Routines specific to "zfs recv"
	*/

	static int
	recv_read(libzfs_handle_t hdl, int fd, void buf, int ilen,
	boolean_t byteswap, zio_cksum_t *zc)
	{
	char *cp = buf;
	int rv;
	int len = ilen;

	do {
	rv = read(fd, cp, len);
	cp += rv;
	len -= rv;
	} while (rv > 0);

	if (rv < 0 \|\| len != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"failed to read from stream"));
	return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN,
	"cannot receive")));
	}

	if (zc) {
	if (byteswap)
	fletcher_4_incremental_byteswap(buf, ilen, zc);
	else
	fletcher_4_incremental_native(buf, ilen, zc);
	}
	return (0);
	}

	static int
	recv_read_nvlist(libzfs_handle_t hdl, int fd, int len, nvlist_t *nvp,
	boolean_t byteswap, zio_cksum_t *zc)
	{
	char *buf;
	int err;

	buf = zfs_alloc(hdl, len);
	if (buf == NULL)
	return (ENOMEM);

	if (len > hdl->libzfs_max_nvlist) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "nvlist too large"));
	free(buf);
	return (ENOMEM);
	}

	err = recv_read(hdl, fd, buf, len, byteswap, zc);
	if (err != 0) {
	free(buf);
	return (err);
	}

	err = nvlist_unpack(buf, len, nvp, 0);
	free(buf);
	if (err != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
	"stream (malformed nvlist)"));
	return (EINVAL);
	}
	return (0);
	}

	/*
	* Returns the grand origin (origin of origin of origin...) of a given handle.
	* If this dataset is not a clone, it simply returns a copy of the original
	* handle.
	*/
	static zfs_handle_t *
	recv_open_grand_origin(zfs_handle_t *zhp)
	{
	char origin[ZFS_MAX_DATASET_NAME_LEN];
	zprop_source_t src;
	zfs_handle_t *ozhp = zfs_handle_dup(zhp);

	while (ozhp != NULL) {
	if (zfs_prop_get(ozhp, ZFS_PROP_ORIGIN, origin,
	sizeof (origin), &src, NULL, 0, B_FALSE) != 0)
	break;

	(void) zfs_close(ozhp);
	ozhp = zfs_open(zhp->zfs_hdl, origin, ZFS_TYPE_FILESYSTEM);
	}

	return (ozhp);
	}

	static int
	recv_rename_impl(zfs_handle_t zhp, const char name, const char *newname)
	{
	int err;
	zfs_handle_t *ozhp = NULL;

	/*
	* Attempt to rename the dataset. If it fails with EACCES we have
	* attempted to rename the dataset outside of its encryption root.
	* Force the dataset to become an encryption root and try again.
	*/
	err = lzc_rename(name, newname);
	if (err == EACCES) {
	ozhp = recv_open_grand_origin(zhp);
	if (ozhp == NULL) {
	err = ENOENT;
	goto out;
	}

	err = lzc_change_key(ozhp->zfs_name, DCP_CMD_FORCE_NEW_KEY,
	NULL, NULL, 0);
	if (err != 0)
	goto out;

	err = lzc_rename(name, newname);
	}

	out:
	if (ozhp != NULL)
	zfs_close(ozhp);
	return (err);
	}

	static int
	recv_rename(libzfs_handle_t hdl, const char name, const char *tryname,
	int baselen, char newname, recvflags_t flags)
	{
	static int seq;
	int err;
	prop_changelist_t *clp = NULL;
	zfs_handle_t *zhp = NULL;

	zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
	if (zhp == NULL) {
	err = -1;
	goto out;
	}
	clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
	flags->force ? MS_FORCE : 0);
	if (clp == NULL) {
	err = -1;
	goto out;
	}
	err = changelist_prefix(clp);
	if (err)
	goto out;

	if (tryname) {
	(void) strcpy(newname, tryname);
	if (flags->verbose) {
	(void) printf("attempting rename %s to %s\n",
	name, newname);
	}
	err = recv_rename_impl(zhp, name, newname);
	if (err == 0)
	changelist_rename(clp, name, tryname);
	} else {
	err = ENOENT;
	}

	if (err != 0 && strncmp(name + baselen, "recv-", 5) != 0) {
	seq++;

	(void) snprintf(newname, ZFS_MAX_DATASET_NAME_LEN,
	"%.*srecv-%u-%u", baselen, name, getpid(), seq);

	if (flags->verbose) {
	(void) printf("failed - trying rename %s to %s\n",
	name, newname);
	}
	err = recv_rename_impl(zhp, name, newname);
	if (err == 0)
	changelist_rename(clp, name, newname);
	if (err && flags->verbose) {
	(void) printf("failed (%u) - "
	"will try again on next pass\n", errno);
	}
	err = EAGAIN;
	} else if (flags->verbose) {
	if (err == 0)
	(void) printf("success\n");
	else
	(void) printf("failed (%u)\n", errno);
	}

	(void) changelist_postfix(clp);

	out:
	if (clp != NULL)
	changelist_free(clp);
	if (zhp != NULL)
	zfs_close(zhp);

	return (err);
	}

	static int
	recv_promote(libzfs_handle_t hdl, const char fsname,
	const char origin_fsname, recvflags_t flags)
	{
	int err;
	zfs_cmd_t zc = {"\0"};
	zfs_handle_t zhp = NULL, ozhp = NULL;

	if (flags->verbose)
	(void) printf("promoting %s\n", fsname);

	(void) strlcpy(zc.zc_value, origin_fsname, sizeof (zc.zc_value));
	(void) strlcpy(zc.zc_name, fsname, sizeof (zc.zc_name));

	/*
	* Attempt to promote the dataset. If it fails with EACCES the
	* promotion would cause this dataset to leave its encryption root.
	* Force the origin to become an encryption root and try again.
	*/
	err = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
	if (err == EACCES) {
	zhp = zfs_open(hdl, fsname, ZFS_TYPE_DATASET);
	if (zhp == NULL) {
	err = -1;
	goto out;
	}

	ozhp = recv_open_grand_origin(zhp);
	if (ozhp == NULL) {
	err = -1;
	goto out;
	}

	err = lzc_change_key(ozhp->zfs_name, DCP_CMD_FORCE_NEW_KEY,
	NULL, NULL, 0);
	if (err != 0)
	goto out;

	err = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
	}

	out:
	if (zhp != NULL)
	zfs_close(zhp);
	if (ozhp != NULL)
	zfs_close(ozhp);

	return (err);
	}

	static int
	recv_destroy(libzfs_handle_t hdl, const char name, int baselen,
	char newname, recvflags_t flags)
	{
	int err = 0;
	prop_changelist_t *clp;
	zfs_handle_t *zhp;
	boolean_t defer = B_FALSE;
	int spa_version;

	zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
	if (zhp == NULL)
	return (-1);
	clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
	flags->force ? MS_FORCE : 0);
	if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
	zfs_spa_version(zhp, &spa_version) == 0 &&
	spa_version >= SPA_VERSION_USERREFS)
	defer = B_TRUE;
	zfs_close(zhp);
	if (clp == NULL)
	return (-1);
	err = changelist_prefix(clp);
	if (err)
	return (err);

	if (flags->verbose)
	(void) printf("attempting destroy %s\n", name);
	if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
	nvlist_t *nv = fnvlist_alloc();
	fnvlist_add_boolean(nv, name);
	err = lzc_destroy_snaps(nv, defer, NULL);
	fnvlist_free(nv);
	} else {
	err = lzc_destroy(name);
	}
	if (err == 0) {
	if (flags->verbose)
	(void) printf("success\n");
	changelist_remove(clp, name);
	}

	(void) changelist_postfix(clp);
	changelist_free(clp);

	/*
	* Deferred destroy might destroy the snapshot or only mark it to be
	* destroyed later, and it returns success in either case.
	*/
	if (err != 0 \|\| (defer && zfs_dataset_exists(hdl, name,
	ZFS_TYPE_SNAPSHOT))) {
	err = recv_rename(hdl, name, NULL, baselen, newname, flags);
	}

	return (err);
	}

	typedef struct guid_to_name_data {
	uint64_t guid;
	boolean_t bookmark_ok;
	char *name;
	char *skip;
	uint64_t *redact_snap_guids;
	uint64_t num_redact_snaps;
	} guid_to_name_data_t;

	static boolean_t
	redact_snaps_match(zfs_handle_t zhp, guid_to_name_data_t gtnd)
	{
	uint64_t *bmark_snaps;
	uint_t bmark_num_snaps;
	nvlist_t *nvl;
	if (zhp->zfs_type != ZFS_TYPE_BOOKMARK)
	return (B_FALSE);

	nvl = fnvlist_lookup_nvlist(zhp->zfs_props,
	zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS));
	bmark_snaps = fnvlist_lookup_uint64_array(nvl, ZPROP_VALUE,
	&bmark_num_snaps);
	if (bmark_num_snaps != gtnd->num_redact_snaps)
	return (B_FALSE);
	int i = 0;
	for (; i < bmark_num_snaps; i++) {
	int j = 0;
	for (; j < bmark_num_snaps; j++) {
	if (bmark_snaps[i] == gtnd->redact_snap_guids[j])
	break;
	}
	if (j == bmark_num_snaps)
	break;
	}
	return (i == bmark_num_snaps);
	}

	static int
	guid_to_name_cb(zfs_handle_t zhp, void arg)
	{
	guid_to_name_data_t *gtnd = arg;
	const char *slash;
	int err;

	if (gtnd->skip != NULL &&
	(slash = strrchr(zhp->zfs_name, '/')) != NULL &&
	strcmp(slash + 1, gtnd->skip) == 0) {
	zfs_close(zhp);
	return (0);
	}

	if (zfs_prop_get_int(zhp, ZFS_PROP_GUID) == gtnd->guid &&
	(gtnd->num_redact_snaps == -1 \|\| redact_snaps_match(zhp, gtnd))) {
	(void) strcpy(gtnd->name, zhp->zfs_name);
	zfs_close(zhp);
	return (EEXIST);
	}

	err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
	if (err != EEXIST && gtnd->bookmark_ok)
	err = zfs_iter_bookmarks(zhp, guid_to_name_cb, gtnd);
	zfs_close(zhp);
	return (err);
	}

	/*
	* Attempt to find the local dataset associated with this guid. In the case of
	* multiple matches, we attempt to find the "best" match by searching
	* progressively larger portions of the hierarchy. This allows one to send a
	* tree of datasets individually and guarantee that we will find the source
	* guid within that hierarchy, even if there are multiple matches elsewhere.
	*
	* If num_redact_snaps is not -1, we attempt to find a redaction bookmark with
	* the specified number of redaction snapshots. If num_redact_snaps isn't 0 or
	* -1, then redact_snap_guids will be an array of the guids of the snapshots the
	* redaction bookmark was created with. If num_redact_snaps is -1, then we will
	* attempt to find a snapshot or bookmark (if bookmark_ok is passed) with the
	* given guid. Note that a redaction bookmark can be returned if
	* num_redact_snaps == -1.
	*/
	static int
	guid_to_name_redact_snaps(libzfs_handle_t hdl, const char parent,
	uint64_t guid, boolean_t bookmark_ok, uint64_t *redact_snap_guids,
	uint64_t num_redact_snaps, char *name)
	{
	char pname[ZFS_MAX_DATASET_NAME_LEN];
	guid_to_name_data_t gtnd;

	gtnd.guid = guid;
	gtnd.bookmark_ok = bookmark_ok;
	gtnd.name = name;
	gtnd.skip = NULL;
	gtnd.redact_snap_guids = redact_snap_guids;
	gtnd.num_redact_snaps = num_redact_snaps;

	/*
	* Search progressively larger portions of the hierarchy, starting
	* with the filesystem specified by 'parent'. This will
	* select the "most local" version of the origin snapshot in the case
	* that there are multiple matching snapshots in the system.
	*/
	(void) strlcpy(pname, parent, sizeof (pname));
	char *cp = strrchr(pname, '@');
	if (cp == NULL)
	cp = strchr(pname, '\0');
	for (; cp != NULL; cp = strrchr(pname, '/')) {
	/* Chop off the last component and open the parent */
	*cp = '\0';
	zfs_handle_t *zhp = make_dataset_handle(hdl, pname);

	if (zhp == NULL)
	continue;
	int err = guid_to_name_cb(zfs_handle_dup(zhp), &gtnd);
	if (err != EEXIST)
	err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
	if (err != EEXIST && bookmark_ok)
	err = zfs_iter_bookmarks(zhp, guid_to_name_cb, &gtnd);
	zfs_close(zhp);
	if (err == EEXIST)
	return (0);

	/*
	* Remember the last portion of the dataset so we skip it next
	* time through (as we've already searched that portion of the
	* hierarchy).
	*/
	gtnd.skip = strrchr(pname, '/') + 1;
	}

	return (ENOENT);
	}

	static int
	guid_to_name(libzfs_handle_t hdl, const char parent, uint64_t guid,
	boolean_t bookmark_ok, char *name)
	{
	return (guid_to_name_redact_snaps(hdl, parent, guid, bookmark_ok, NULL,
	-1, name));
	}

	/*
	* Return +1 if guid1 is before guid2, 0 if they are the same, and -1 if
	* guid1 is after guid2.
	*/
	static int
	created_before(libzfs_handle_t hdl, avl_tree_t avl,
	uint64_t guid1, uint64_t guid2)
	{
	nvlist_t *nvfs;
	char fsname = NULL, snapname = NULL;
	char buf[ZFS_MAX_DATASET_NAME_LEN];
	int rv;
	zfs_handle_t guid1hdl, guid2hdl;
	uint64_t create1, create2;

	if (guid2 == 0)
	return (0);
	if (guid1 == 0)
	return (1);

	nvfs = fsavl_find(avl, guid1, &snapname);
	fsname = fnvlist_lookup_string(nvfs, "name");
	(void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
	guid1hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
	if (guid1hdl == NULL)
	return (-1);

	nvfs = fsavl_find(avl, guid2, &snapname);
	fsname = fnvlist_lookup_string(nvfs, "name");
	(void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
	guid2hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
	if (guid2hdl == NULL) {
	zfs_close(guid1hdl);
	return (-1);
	}

	create1 = zfs_prop_get_int(guid1hdl, ZFS_PROP_CREATETXG);
	create2 = zfs_prop_get_int(guid2hdl, ZFS_PROP_CREATETXG);

	if (create1 < create2)
	rv = -1;
	else if (create1 > create2)
	rv = +1;
	else
	rv = 0;

	zfs_close(guid1hdl);
	zfs_close(guid2hdl);

	return (rv);
	}

	/*
	* This function reestablishes the hierarchy of encryption roots after a
	* recursive incremental receive has completed. This must be done after the
	* second call to recv_incremental_replication() has renamed and promoted all
	* sent datasets to their final locations in the dataset hierarchy.
	*/
	static int
	recv_fix_encryption_hierarchy(libzfs_handle_t hdl, const char top_zfs,
	nvlist_t stream_nv, avl_tree_t stream_avl)
	{
	int err;
	nvpair_t *fselem = NULL;
	nvlist_t *stream_fss;

	stream_fss = fnvlist_lookup_nvlist(stream_nv, "fss");

	while ((fselem = nvlist_next_nvpair(stream_fss, fselem)) != NULL) {
	zfs_handle_t *zhp = NULL;
	uint64_t crypt;
	nvlist_t snaps, props, *stream_nvfs = NULL;
	nvpair_t *snapel = NULL;
	boolean_t is_encroot, is_clone, stream_encroot;
	char *cp;
	char *stream_keylocation = NULL;
	char keylocation[MAXNAMELEN];
	char fsname[ZFS_MAX_DATASET_NAME_LEN];

	keylocation[0] = '\0';
	stream_nvfs = fnvpair_value_nvlist(fselem);
	snaps = fnvlist_lookup_nvlist(stream_nvfs, "snaps");
	props = fnvlist_lookup_nvlist(stream_nvfs, "props");
	stream_encroot = nvlist_exists(stream_nvfs, "is_encroot");

	/* find a snapshot from the stream that exists locally */
	err = ENOENT;
	while ((snapel = nvlist_next_nvpair(snaps, snapel)) != NULL) {
	uint64_t guid;

	guid = fnvpair_value_uint64(snapel);
	err = guid_to_name(hdl, top_zfs, guid, B_FALSE,
	fsname);
	if (err == 0)
	break;
	}

	if (err != 0)
	continue;

	cp = strchr(fsname, '@');
	if (cp != NULL)
	*cp = '\0';

	zhp = zfs_open(hdl, fsname, ZFS_TYPE_DATASET);
	if (zhp == NULL) {
	err = ENOENT;
	goto error;
	}

	crypt = zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION);
	is_clone = zhp->zfs_dmustats.dds_origin[0] != '\0';
	(void) zfs_crypto_get_encryption_root(zhp, &is_encroot, NULL);

	/* we don't need to do anything for unencrypted datasets */
	if (crypt == ZIO_CRYPT_OFF) {
	zfs_close(zhp);
	continue;
	}

	/*
	* If the dataset is flagged as an encryption root, was not
	* received as a clone and is not currently an encryption root,
	* force it to become one. Fixup the keylocation if necessary.
	*/
	if (stream_encroot) {
	if (!is_clone && !is_encroot) {
	err = lzc_change_key(fsname,
	DCP_CMD_FORCE_NEW_KEY, NULL, NULL, 0);
	if (err != 0) {
	zfs_close(zhp);
	goto error;
	}
	}

	stream_keylocation = fnvlist_lookup_string(props,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION));

	/*
	* Refresh the properties in case the call to
	* lzc_change_key() changed the value.
	*/
	zfs_refresh_properties(zhp);
	err = zfs_prop_get(zhp, ZFS_PROP_KEYLOCATION,
	keylocation, sizeof (keylocation), NULL, NULL,
	0, B_TRUE);
	if (err != 0) {
	zfs_close(zhp);
	goto error;
	}

	if (strcmp(keylocation, stream_keylocation) != 0) {
	err = zfs_prop_set(zhp,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
	stream_keylocation);
	if (err != 0) {
	zfs_close(zhp);
	goto error;
	}
	}
	}

	/*
	* If the dataset is not flagged as an encryption root and is
	* currently an encryption root, force it to inherit from its
	* parent. The root of a raw send should never be
	* force-inherited.
	*/
	if (!stream_encroot && is_encroot &&
	strcmp(top_zfs, fsname) != 0) {
	err = lzc_change_key(fsname, DCP_CMD_FORCE_INHERIT,
	NULL, NULL, 0);
	if (err != 0) {
	zfs_close(zhp);
	goto error;
	}
	}

	zfs_close(zhp);
	}

	return (0);

	error:
	return (err);
	}

	static int
	recv_incremental_replication(libzfs_handle_t hdl, const char tofs,
	recvflags_t flags, nvlist_t stream_nv, avl_tree_t *stream_avl,
	nvlist_t *renamed)
	{
	nvlist_t local_nv, deleted = NULL;
	avl_tree_t *local_avl;
	nvpair_t fselem, nextfselem;
	char *fromsnap;
	char newname[ZFS_MAX_DATASET_NAME_LEN];
	char guidname[32];
	int error;
	boolean_t needagain, progress, recursive;
	char s1, s2;

	fromsnap = fnvlist_lookup_string(stream_nv, "fromsnap");

	recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
	ENOENT);

	if (flags->dryrun)
	return (0);

	again:
	needagain = progress = B_FALSE;

	deleted = fnvlist_alloc();

	if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
	recursive, B_TRUE, B_FALSE, recursive, B_FALSE, B_FALSE, B_FALSE,
	B_FALSE, B_TRUE, &local_nv, &local_avl)) != 0)
	return (error);

	/*
	* Process deletes and renames
	*/
	for (fselem = nvlist_next_nvpair(local_nv, NULL);
	fselem; fselem = nextfselem) {
	nvlist_t nvfs, snaps;
	nvlist_t *stream_nvfs = NULL;
	nvpair_t snapelem, nextsnapelem;
	uint64_t fromguid = 0;
	uint64_t originguid = 0;
	uint64_t stream_originguid = 0;
	uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid;
	char fsname, stream_fsname;

	nextfselem = nvlist_next_nvpair(local_nv, fselem);

	nvfs = fnvpair_value_nvlist(fselem);
	snaps = fnvlist_lookup_nvlist(nvfs, "snaps");
	fsname = fnvlist_lookup_string(nvfs, "name");
	parent_fromsnap_guid = fnvlist_lookup_uint64(nvfs,
	"parentfromsnap");
	(void) nvlist_lookup_uint64(nvfs, "origin", &originguid);

	/*
	* First find the stream's fs, so we can check for
	* a different origin (due to "zfs promote")
	*/
	for (snapelem = nvlist_next_nvpair(snaps, NULL);
	snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) {
	uint64_t thisguid;

	thisguid = fnvpair_value_uint64(snapelem);
	stream_nvfs = fsavl_find(stream_avl, thisguid, NULL);

	if (stream_nvfs != NULL)
	break;
	}

	/* check for promote */
	(void) nvlist_lookup_uint64(stream_nvfs, "origin",
	&stream_originguid);
	if (stream_nvfs && originguid != stream_originguid) {
	switch (created_before(hdl, local_avl,
	stream_originguid, originguid)) {
	case 1: {
	/* promote it! */
	nvlist_t *origin_nvfs;
	char *origin_fsname;

	origin_nvfs = fsavl_find(local_avl, originguid,
	NULL);
	origin_fsname = fnvlist_lookup_string(
	origin_nvfs, "name");
	error = recv_promote(hdl, fsname, origin_fsname,
	flags);
	if (error == 0)
	progress = B_TRUE;
	break;
	}
	default:
	break;
	case -1:
	fsavl_destroy(local_avl);
	fnvlist_free(local_nv);
	return (-1);
	}
	/*
	* We had/have the wrong origin, therefore our
	* list of snapshots is wrong. Need to handle
	* them on the next pass.
	*/
	needagain = B_TRUE;
	continue;
	}

	for (snapelem = nvlist_next_nvpair(snaps, NULL);
	snapelem; snapelem = nextsnapelem) {
	uint64_t thisguid;
	char *stream_snapname;
	nvlist_t found, props;

	nextsnapelem = nvlist_next_nvpair(snaps, snapelem);

	thisguid = fnvpair_value_uint64(snapelem);
	found = fsavl_find(stream_avl, thisguid,
	&stream_snapname);

	/* check for delete */
	if (found == NULL) {
	char name[ZFS_MAX_DATASET_NAME_LEN];

	if (!flags->force)
	continue;

	(void) snprintf(name, sizeof (name), "%s@%s",
	fsname, nvpair_name(snapelem));

	error = recv_destroy(hdl, name,
	strlen(fsname)+1, newname, flags);
	if (error)
	needagain = B_TRUE;
	else
	progress = B_TRUE;
	sprintf(guidname, "%llu",
	(u_longlong_t)thisguid);
	nvlist_add_boolean(deleted, guidname);
	continue;
	}

	stream_nvfs = found;

	if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops",
	&props) && 0 == nvlist_lookup_nvlist(props,
	stream_snapname, &props)) {
	zfs_cmd_t zc = {"\0"};

	zc.zc_cookie = B_TRUE; /* received */
	(void) snprintf(zc.zc_name, sizeof (zc.zc_name),
	"%s@%s", fsname, nvpair_name(snapelem));
	if (zcmd_write_src_nvlist(hdl, &zc,
	props) == 0) {
	(void) zfs_ioctl(hdl,
	ZFS_IOC_SET_PROP, &zc);
	zcmd_free_nvlists(&zc);
	}
	}

	/* check for different snapname */
	if (strcmp(nvpair_name(snapelem),
	stream_snapname) != 0) {
	char name[ZFS_MAX_DATASET_NAME_LEN];
	char tryname[ZFS_MAX_DATASET_NAME_LEN];

	(void) snprintf(name, sizeof (name), "%s@%s",
	fsname, nvpair_name(snapelem));
	(void) snprintf(tryname, sizeof (name), "%s@%s",
	fsname, stream_snapname);

	error = recv_rename(hdl, name, tryname,
	strlen(fsname)+1, newname, flags);
	if (error)
	needagain = B_TRUE;
	else
	progress = B_TRUE;
	}

	if (strcmp(stream_snapname, fromsnap) == 0)
	fromguid = thisguid;
	}

	/* check for delete */
	if (stream_nvfs == NULL) {
	if (!flags->force)
	continue;

	error = recv_destroy(hdl, fsname, strlen(tofs)+1,
	newname, flags);
	if (error)
	needagain = B_TRUE;
	else
	progress = B_TRUE;
	sprintf(guidname, "%llu",
	(u_longlong_t)parent_fromsnap_guid);
	nvlist_add_boolean(deleted, guidname);
	continue;
	}

	if (fromguid == 0) {
	if (flags->verbose) {
	(void) printf("local fs %s does not have "
	"fromsnap (%s in stream); must have "
	"been deleted locally; ignoring\n",
	fsname, fromsnap);
	}
	continue;
	}

	stream_fsname = fnvlist_lookup_string(stream_nvfs, "name");
	stream_parent_fromsnap_guid = fnvlist_lookup_uint64(
	stream_nvfs, "parentfromsnap");

	s1 = strrchr(fsname, '/');
	s2 = strrchr(stream_fsname, '/');

	/*
	* Check if we're going to rename based on parent guid change
	* and the current parent guid was also deleted. If it was then
	* rename will fail and is likely unneeded, so avoid this and
	* force an early retry to determine the new
	* parent_fromsnap_guid.
	*/
	if (stream_parent_fromsnap_guid != 0 &&
	parent_fromsnap_guid != 0 &&
	stream_parent_fromsnap_guid != parent_fromsnap_guid) {
	sprintf(guidname, "%llu",
	(u_longlong_t)parent_fromsnap_guid);
	if (nvlist_exists(deleted, guidname)) {
	progress = B_TRUE;
	needagain = B_TRUE;
	goto doagain;
	}
	}

	/*
	* Check for rename. If the exact receive path is specified, it
	* does not count as a rename, but we still need to check the
	* datasets beneath it.
	*/
	if ((stream_parent_fromsnap_guid != 0 &&
	parent_fromsnap_guid != 0 &&
	stream_parent_fromsnap_guid != parent_fromsnap_guid) \|\|
	((flags->isprefix \|\| strcmp(tofs, fsname) != 0) &&
	(s1 != NULL) && (s2 != NULL) && strcmp(s1, s2) != 0)) {
	nvlist_t *parent;
	char tryname[ZFS_MAX_DATASET_NAME_LEN];

	parent = fsavl_find(local_avl,
	stream_parent_fromsnap_guid, NULL);
	/*
	* NB: parent might not be found if we used the
	* tosnap for stream_parent_fromsnap_guid,
	* because the parent is a newly-created fs;
	* we'll be able to rename it after we recv the
	* new fs.
	*/
	if (parent != NULL) {
	char *pname;

	pname = fnvlist_lookup_string(parent, "name");
	(void) snprintf(tryname, sizeof (tryname),
	"%s%s", pname, strrchr(stream_fsname, '/'));
	} else {
	tryname[0] = '\0';
	if (flags->verbose) {
	(void) printf("local fs %s new parent "
	"not found\n", fsname);
	}
	}

	newname[0] = '\0';

	error = recv_rename(hdl, fsname, tryname,
	strlen(tofs)+1, newname, flags);

	if (renamed != NULL && newname[0] != '\0') {
	fnvlist_add_boolean(renamed, newname);
	}

	if (error)
	needagain = B_TRUE;
	else
	progress = B_TRUE;
	}
	}

	doagain:
	fsavl_destroy(local_avl);
	fnvlist_free(local_nv);
	fnvlist_free(deleted);

	if (needagain && progress) {
	/* do another pass to fix up temporary names */
	if (flags->verbose)
	(void) printf("another pass:\n");
	goto again;
	}

	return (needagain \|\| error != 0);
	}

	static int
	zfs_receive_package(libzfs_handle_t hdl, int fd, const char destname,
	recvflags_t flags, dmu_replay_record_t drr, zio_cksum_t *zc,
	char *top_zfs, nvlist_t cmdprops)
	{
	nvlist_t *stream_nv = NULL;
	avl_tree_t *stream_avl = NULL;
	char *fromsnap = NULL;
	char *sendsnap = NULL;
	char *cp;
	char tofs[ZFS_MAX_DATASET_NAME_LEN];
	char sendfs[ZFS_MAX_DATASET_NAME_LEN];
	char errbuf[1024];
	dmu_replay_record_t drre;
	int error;
	boolean_t anyerr = B_FALSE;
	boolean_t softerr = B_FALSE;
	boolean_t recursive, raw;

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot receive"));

	assert(drr->drr_type == DRR_BEGIN);
	assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
	assert(DMU_GET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo) ==
	DMU_COMPOUNDSTREAM);

	/*
	* Read in the nvlist from the stream.
	*/
	if (drr->drr_payloadlen != 0) {
	error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen,
	&stream_nv, flags->byteswap, zc);
	if (error) {
	error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	goto out;
	}
	}

	recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
	ENOENT);
	raw = (nvlist_lookup_boolean(stream_nv, "raw") == 0);

	if (recursive && strchr(destname, '@')) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"cannot specify snapshot name for multi-snapshot stream"));
	error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	goto out;
	}

	/*
	* Read in the end record and verify checksum.
	*/
	if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre),
	flags->byteswap, NULL)))
	goto out;
	if (flags->byteswap) {
	drre.drr_type = BSWAP_32(drre.drr_type);
	drre.drr_u.drr_end.drr_checksum.zc_word[0] =
	BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]);
	drre.drr_u.drr_end.drr_checksum.zc_word[1] =
	BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]);
	drre.drr_u.drr_end.drr_checksum.zc_word[2] =
	BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]);
	drre.drr_u.drr_end.drr_checksum.zc_word[3] =
	BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]);
	}
	if (drre.drr_type != DRR_END) {
	error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	goto out;
	}
	if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incorrect header checksum"));
	error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	goto out;
	}

	(void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap);

	if (drr->drr_payloadlen != 0) {
	nvlist_t *stream_fss;

	stream_fss = fnvlist_lookup_nvlist(stream_nv, "fss");
	if ((stream_avl = fsavl_create(stream_fss)) == NULL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"couldn't allocate avl tree"));
	error = zfs_error(hdl, EZFS_NOMEM, errbuf);
	goto out;
	}

	if (fromsnap != NULL && recursive) {
	nvlist_t *renamed = NULL;
	nvpair_t *pair = NULL;

	(void) strlcpy(tofs, destname, sizeof (tofs));
	if (flags->isprefix) {
	struct drr_begin *drrb = &drr->drr_u.drr_begin;
	int i;

	if (flags->istail) {
	cp = strrchr(drrb->drr_toname, '/');
	if (cp == NULL) {
	(void) strlcat(tofs, "/",
	sizeof (tofs));
	i = 0;
	} else {
	i = (cp - drrb->drr_toname);
	}
	} else {
	i = strcspn(drrb->drr_toname, "/@");
	}
	/* zfs_receive_one() will create_parents() */
	(void) strlcat(tofs, &drrb->drr_toname[i],
	sizeof (tofs));
	*strchr(tofs, '@') = '\0';
	}

	if (!flags->dryrun && !flags->nomount) {
	renamed = fnvlist_alloc();
	}

	softerr = recv_incremental_replication(hdl, tofs, flags,
	stream_nv, stream_avl, renamed);

	/* Unmount renamed filesystems before receiving. */
	while ((pair = nvlist_next_nvpair(renamed,
	pair)) != NULL) {
	zfs_handle_t *zhp;
	prop_changelist_t *clp = NULL;

	zhp = zfs_open(hdl, nvpair_name(pair),
	ZFS_TYPE_FILESYSTEM);
	if (zhp != NULL) {
	clp = changelist_gather(zhp,
	ZFS_PROP_MOUNTPOINT, 0,
	flags->forceunmount ? MS_FORCE : 0);
	zfs_close(zhp);
	if (clp != NULL) {
	softerr \|=
	changelist_prefix(clp);
	changelist_free(clp);
	}
	}
	}

	fnvlist_free(renamed);
	}
	}

	/*
	* Get the fs specified by the first path in the stream (the top level
	* specified by 'zfs send') and pass it to each invocation of
	* zfs_receive_one().
	*/
	(void) strlcpy(sendfs, drr->drr_u.drr_begin.drr_toname,
	sizeof (sendfs));
	if ((cp = strchr(sendfs, '@')) != NULL) {
	*cp = '\0';
	/*
	* Find the "sendsnap", the final snapshot in a replication
	* stream. zfs_receive_one() handles certain errors
	* differently, depending on if the contained stream is the
	* last one or not.
	*/
	sendsnap = (cp + 1);
	}

	/* Finally, receive each contained stream */
	do {
	/*
	* we should figure out if it has a recoverable
	* error, in which case do a recv_skip() and drive on.
	* Note, if we fail due to already having this guid,
	* zfs_receive_one() will take care of it (ie,
	* recv_skip() and return 0).
	*/
	error = zfs_receive_impl(hdl, destname, NULL, flags, fd,
	sendfs, stream_nv, stream_avl, top_zfs, sendsnap, cmdprops);
	if (error == ENODATA) {
	error = 0;
	break;
	}
	anyerr \|= error;
	} while (error == 0);

	if (drr->drr_payloadlen != 0 && recursive && fromsnap != NULL) {
	/*
	* Now that we have the fs's they sent us, try the
	* renames again.
	*/
	softerr = recv_incremental_replication(hdl, tofs, flags,
	stream_nv, stream_avl, NULL);
	}

	if (raw && softerr == 0 && *top_zfs != NULL) {
	softerr = recv_fix_encryption_hierarchy(hdl, *top_zfs,
	stream_nv, stream_avl);
	}

	out:
	fsavl_destroy(stream_avl);
	fnvlist_free(stream_nv);
	if (softerr)
	error = -2;
	if (anyerr)
	error = -1;
	return (error);
	}

	static void
	trunc_prop_errs(int truncated)
	{
	ASSERT(truncated != 0);

	if (truncated == 1)
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"1 more property could not be set\n"));
	else
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"%d more properties could not be set\n"), truncated);
	}

	static int
	recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
	{
	dmu_replay_record_t *drr;
	void *buf = zfs_alloc(hdl, SPA_MAXBLOCKSIZE);
	uint64_t payload_size;
	char errbuf[1024];

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot receive"));

	/* XXX would be great to use lseek if possible... */
	drr = buf;

	while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t),
	byteswap, NULL) == 0) {
	if (byteswap)
	drr->drr_type = BSWAP_32(drr->drr_type);

	switch (drr->drr_type) {
	case DRR_BEGIN:
	if (drr->drr_payloadlen != 0) {
	(void) recv_read(hdl, fd, buf,
	drr->drr_payloadlen, B_FALSE, NULL);
	}
	break;

	case DRR_END:
	free(buf);
	return (0);

	case DRR_OBJECT:
	if (byteswap) {
	drr->drr_u.drr_object.drr_bonuslen =
	BSWAP_32(drr->drr_u.drr_object.
	drr_bonuslen);
	drr->drr_u.drr_object.drr_raw_bonuslen =
	BSWAP_32(drr->drr_u.drr_object.
	drr_raw_bonuslen);
	}

	payload_size =
	DRR_OBJECT_PAYLOAD_SIZE(&drr->drr_u.drr_object);
	(void) recv_read(hdl, fd, buf, payload_size,
	B_FALSE, NULL);
	break;

	case DRR_WRITE:
	if (byteswap) {
	drr->drr_u.drr_write.drr_logical_size =
	BSWAP_64(
	drr->drr_u.drr_write.drr_logical_size);
	drr->drr_u.drr_write.drr_compressed_size =
	BSWAP_64(
	drr->drr_u.drr_write.drr_compressed_size);
	}
	payload_size =
	DRR_WRITE_PAYLOAD_SIZE(&drr->drr_u.drr_write);
	assert(payload_size <= SPA_MAXBLOCKSIZE);
	(void) recv_read(hdl, fd, buf,
	payload_size, B_FALSE, NULL);
	break;
	case DRR_SPILL:
	if (byteswap) {
	drr->drr_u.drr_spill.drr_length =
	BSWAP_64(drr->drr_u.drr_spill.drr_length);
	drr->drr_u.drr_spill.drr_compressed_size =
	BSWAP_64(drr->drr_u.drr_spill.
	drr_compressed_size);
	}

	payload_size =
	DRR_SPILL_PAYLOAD_SIZE(&drr->drr_u.drr_spill);
	(void) recv_read(hdl, fd, buf, payload_size,
	B_FALSE, NULL);
	break;
	case DRR_WRITE_EMBEDDED:
	if (byteswap) {
	drr->drr_u.drr_write_embedded.drr_psize =
	BSWAP_32(drr->drr_u.drr_write_embedded.
	drr_psize);
	}
	(void) recv_read(hdl, fd, buf,
	P2ROUNDUP(drr->drr_u.drr_write_embedded.drr_psize,
	8), B_FALSE, NULL);
	break;
	case DRR_OBJECT_RANGE:
	case DRR_WRITE_BYREF:
	case DRR_FREEOBJECTS:
	case DRR_FREE:
	break;

	default:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"invalid record type"));
	free(buf);
	return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
	}
	}

	free(buf);
	return (-1);
	}

	static void
	recv_ecksum_set_aux(libzfs_handle_t hdl, const char target_snap,
	boolean_t resumable, boolean_t checksum)
	{
	char target_fs[ZFS_MAX_DATASET_NAME_LEN];

	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, (checksum ?
	"checksum mismatch" : "incomplete stream")));

	if (!resumable)
	return;
	(void) strlcpy(target_fs, target_snap, sizeof (target_fs));
	*strchr(target_fs, '@') = '\0';
	zfs_handle_t *zhp = zfs_open(hdl, target_fs,
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL)
	return;

	char token_buf[ZFS_MAXPROPLEN];
	int error = zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
	token_buf, sizeof (token_buf),
	NULL, NULL, 0, B_TRUE);
	if (error == 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"checksum mismatch or incomplete stream.\n"
	"Partially received snapshot is saved.\n"
	"A resuming stream can be generated on the sending "
	"system by running:\n"
	" zfs send -t %s"),
	token_buf);
	}
	zfs_close(zhp);
	}

	/*
	* Prepare a new nvlist of properties that are to override (-o) or be excluded
	* (-x) from the received dataset
	* recvprops: received properties from the send stream
	* cmdprops: raw input properties from command line
	* origprops: properties, both locally-set and received, currently set on the
	* target dataset if it exists, NULL otherwise.
	* oxprops: valid output override (-o) and excluded (-x) properties
	*/
	static int
	zfs_setup_cmdline_props(libzfs_handle_t *hdl, zfs_type_t type,
	char *fsname, boolean_t zoned, boolean_t recursive, boolean_t newfs,
	boolean_t raw, boolean_t toplevel, nvlist_t recvprops, nvlist_t cmdprops,
	nvlist_t origprops, nvlist_t oxprops, uint8_t *wkeydata_out,
	uint_t wkeylen_out, const char errbuf)
	{
	nvpair_t *nvp;
	nvlist_t oprops, voprops;
	zfs_handle_t *zhp = NULL;
	zpool_handle_t *zpool_hdl = NULL;
	char *cp;
	int ret = 0;
	char namebuf[ZFS_MAX_DATASET_NAME_LEN];

	if (nvlist_empty(cmdprops))
	return (0); /* No properties to override or exclude */

	*oxprops = fnvlist_alloc();
	oprops = fnvlist_alloc();

	strlcpy(namebuf, fsname, ZFS_MAX_DATASET_NAME_LEN);

	/*
	* Get our dataset handle. The target dataset may not exist yet.
	*/
	if (zfs_dataset_exists(hdl, namebuf, ZFS_TYPE_DATASET)) {
	zhp = zfs_open(hdl, namebuf, ZFS_TYPE_DATASET);
	if (zhp == NULL) {
	ret = -1;
	goto error;
	}
	}

	/* open the zpool handle */
	cp = strchr(namebuf, '/');
	if (cp != NULL)
	*cp = '\0';
	zpool_hdl = zpool_open(hdl, namebuf);
	if (zpool_hdl == NULL) {
	ret = -1;
	goto error;
	}

	/* restore namebuf to match fsname for later use */
	if (cp != NULL)
	*cp = '/';

	/*
	* first iteration: process excluded (-x) properties now and gather
	* added (-o) properties to be later processed by zfs_valid_proplist()
	*/
	nvp = NULL;
	while ((nvp = nvlist_next_nvpair(cmdprops, nvp)) != NULL) {
	const char *name = nvpair_name(nvp);
	zfs_prop_t prop = zfs_name_to_prop(name);

	/* "origin" is processed separately, don't handle it here */
	if (prop == ZFS_PROP_ORIGIN)
	continue;

	/* raw streams can't override encryption properties */
	if ((zfs_prop_encryption_key_param(prop) \|\|
	prop == ZFS_PROP_ENCRYPTION) && raw) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"encryption property '%s' cannot "
	"be set or excluded for raw streams."), name);
	ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	/* incremental streams can only exclude encryption properties */
	if ((zfs_prop_encryption_key_param(prop) \|\|
	prop == ZFS_PROP_ENCRYPTION) && !newfs &&
	nvpair_type(nvp) != DATA_TYPE_BOOLEAN) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"encryption property '%s' cannot "
	"be set for incremental streams."), name);
	ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	switch (nvpair_type(nvp)) {
	case DATA_TYPE_BOOLEAN: /* -x property */
	/*
	* DATA_TYPE_BOOLEAN is the way we're asked to "exclude"
	* a property: this is done by forcing an explicit
	* inherit on the destination so the effective value is
	* not the one we received from the send stream.
	*/
	if (!zfs_prop_valid_for_type(prop, type, B_FALSE) &&
	!zfs_prop_user(name)) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
	"Warning: %s: property '%s' does not "
	"apply to datasets of this type\n"),
	fsname, name);
	continue;
	}
	/*
	* We do this only if the property is not already
	* locally-set, in which case its value will take
	* priority over the received anyway.
	*/
	if (nvlist_exists(origprops, name)) {
	nvlist_t *attrs;
	char *source = NULL;

	attrs = fnvlist_lookup_nvlist(origprops, name);
	if (nvlist_lookup_string(attrs,
	ZPROP_SOURCE, &source) == 0 &&
	strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0)
	continue;
	}
	/*
	* We can't force an explicit inherit on non-inheritable
	* properties: if we're asked to exclude this kind of
	* values we remove them from "recvprops" input nvlist.
	*/
	if (!zfs_prop_inheritable(prop) &&
	!zfs_prop_user(name) && /* can be inherited too */
	nvlist_exists(recvprops, name))
	fnvlist_remove(recvprops, name);
	else
	fnvlist_add_nvpair(*oxprops, nvp);
	break;
	case DATA_TYPE_STRING: /* -o property=value */
	/*
	* we're trying to override a property that does not
	* make sense for this type of dataset, but we don't
	* want to fail if the receive is recursive: this comes
	* in handy when the send stream contains, for
	* instance, a child ZVOL and we're trying to receive
	* it with "-o atime=on"
	*/
	if (!zfs_prop_valid_for_type(prop, type, B_FALSE) &&
	!zfs_prop_user(name)) {
	if (recursive)
	continue;
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' does not apply to datasets "
	"of this type"), name);
	ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}
	fnvlist_add_nvpair(oprops, nvp);
	break;
	default:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"property '%s' must be a string or boolean"), name);
	ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}
	}

	if (toplevel) {
	/* convert override strings properties to native */
	if ((voprops = zfs_valid_proplist(hdl, ZFS_TYPE_DATASET,
	oprops, zoned, zhp, zpool_hdl, B_FALSE, errbuf)) == NULL) {
	ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
	goto error;
	}

	/*
	* zfs_crypto_create() requires the parent name. Get it
	* by truncating the fsname copy stored in namebuf.
	*/
	cp = strrchr(namebuf, '/');
	if (cp != NULL)
	*cp = '\0';

	if (!raw && zfs_crypto_create(hdl, namebuf, voprops, NULL,
	B_FALSE, wkeydata_out, wkeylen_out) != 0) {
	fnvlist_free(voprops);
	ret = zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf);
	goto error;
	}

	/* second pass: process "-o" properties */
	fnvlist_merge(*oxprops, voprops);
	fnvlist_free(voprops);
	} else {
	/* override props on child dataset are inherited */
	nvp = NULL;
	while ((nvp = nvlist_next_nvpair(oprops, nvp)) != NULL) {
	const char *name = nvpair_name(nvp);
	fnvlist_add_boolean(*oxprops, name);
	}
	}

	error:
	if (zhp != NULL)
	zfs_close(zhp);
	if (zpool_hdl != NULL)
	zpool_close(zpool_hdl);
	fnvlist_free(oprops);
	return (ret);
	}

	/*
	* Restores a backup of tosnap from the file descriptor specified by infd.
	*/
	static int
	zfs_receive_one(libzfs_handle_t hdl, int infd, const char tosnap,
	const char originsnap, recvflags_t flags, dmu_replay_record_t *drr,
	dmu_replay_record_t drr_noswap, const char sendfs, nvlist_t *stream_nv,
	avl_tree_t stream_avl, char *top_zfs,
	const char finalsnap, nvlist_t cmdprops)
	{
	time_t begin_time;
	int ioctl_err, ioctl_errno, err;
	char *cp;
	struct drr_begin *drrb = &drr->drr_u.drr_begin;
	char errbuf[1024];
	const char *chopprefix;
	boolean_t newfs = B_FALSE;
	boolean_t stream_wantsnewfs, stream_resumingnewfs;
	boolean_t newprops = B_FALSE;
	uint64_t read_bytes = 0;
	uint64_t errflags = 0;
	uint64_t parent_snapguid = 0;
	prop_changelist_t *clp = NULL;
	nvlist_t *snapprops_nvlist = NULL;
	nvlist_t *snapholds_nvlist = NULL;
	zprop_errflags_t prop_errflags;
	nvlist_t *prop_errors = NULL;
	boolean_t recursive;
	char *snapname = NULL;
	char destsnap[MAXPATHLEN * 2];
	char origin[MAXNAMELEN];
	char name[MAXPATHLEN];
	char tmp_keylocation[MAXNAMELEN];
	nvlist_t rcvprops = NULL; / props received from the send stream */
	nvlist_t oxprops = NULL; / override (-o) and exclude (-x) props */
	nvlist_t origprops = NULL; / original props (if destination exists) */
	zfs_type_t type;
	boolean_t toplevel = B_FALSE;
	boolean_t zoned = B_FALSE;
	boolean_t hastoken = B_FALSE;
	boolean_t redacted;
	uint8_t *wkeydata = NULL;
	uint_t wkeylen = 0;

	begin_time = time(NULL);
	bzero(origin, MAXNAMELEN);
	bzero(tmp_keylocation, MAXNAMELEN);

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot receive"));

	recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
	ENOENT);

	/* Did the user request holds be skipped via zfs recv -k? */
	boolean_t holds = flags->holds && !flags->skipholds;

	if (stream_avl != NULL) {
	char *keylocation = NULL;
	nvlist_t *lookup = NULL;
	nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid,
	&snapname);

	(void) nvlist_lookup_uint64(fs, "parentfromsnap",
	&parent_snapguid);
	err = nvlist_lookup_nvlist(fs, "props", &rcvprops);
	if (err) {
	rcvprops = fnvlist_alloc();
	newprops = B_TRUE;
	}

	/*
	* The keylocation property may only be set on encryption roots,
	* but this dataset might not become an encryption root until
	* recv_fix_encryption_hierarchy() is called. That function
	* will fixup the keylocation anyway, so we temporarily unset
	* the keylocation for now to avoid any errors from the receive
	* ioctl.
	*/
	err = nvlist_lookup_string(rcvprops,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION), &keylocation);
	if (err == 0) {
	strcpy(tmp_keylocation, keylocation);
	(void) nvlist_remove_all(rcvprops,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION));
	}

	if (flags->canmountoff) {
	fnvlist_add_uint64(rcvprops,
	zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0);
	} else if (newprops) { /* nothing in rcvprops, eliminate it */
	fnvlist_free(rcvprops);
	rcvprops = NULL;
	newprops = B_FALSE;
	}
	if (0 == nvlist_lookup_nvlist(fs, "snapprops", &lookup)) {
	snapprops_nvlist = fnvlist_lookup_nvlist(lookup,
	snapname);
	}
	if (holds) {
	if (0 == nvlist_lookup_nvlist(fs, "snapholds",
	&lookup)) {
	snapholds_nvlist = fnvlist_lookup_nvlist(
	lookup, snapname);
	}
	}
	}

	cp = NULL;

	/*
	* Determine how much of the snapshot name stored in the stream
	* we are going to tack on to the name they specified on the
	* command line, and how much we are going to chop off.
	*
	* If they specified a snapshot, chop the entire name stored in
	* the stream.
	*/
	if (flags->istail) {
	/*
	* A filesystem was specified with -e. We want to tack on only
	* the tail of the sent snapshot path.
	*/
	if (strchr(tosnap, '@')) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
	"argument - snapshot not allowed with -e"));
	err = zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
	goto out;
	}

	chopprefix = strrchr(sendfs, '/');

	if (chopprefix == NULL) {
	/*
	* The tail is the poolname, so we need to
	* prepend a path separator.
	*/
	int len = strlen(drrb->drr_toname);
	cp = malloc(len + 2);
	cp[0] = '/';
	(void) strcpy(&cp[1], drrb->drr_toname);
	chopprefix = cp;
	} else {
	chopprefix = drrb->drr_toname + (chopprefix - sendfs);
	}
	} else if (flags->isprefix) {
	/*
	* A filesystem was specified with -d. We want to tack on
	* everything but the first element of the sent snapshot path
	* (all but the pool name).
	*/
	if (strchr(tosnap, '@')) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
	"argument - snapshot not allowed with -d"));
	err = zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
	goto out;
	}

	chopprefix = strchr(drrb->drr_toname, '/');
	if (chopprefix == NULL)
	chopprefix = strchr(drrb->drr_toname, '@');
	} else if (strchr(tosnap, '@') == NULL) {
	/*
	* If a filesystem was specified without -d or -e, we want to
	* tack on everything after the fs specified by 'zfs send'.
	*/
	chopprefix = drrb->drr_toname + strlen(sendfs);
	} else {
	/* A snapshot was specified as an exact path (no -d or -e). */
	if (recursive) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"cannot specify snapshot name for multi-snapshot "
	"stream"));
	err = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	goto out;
	}
	chopprefix = drrb->drr_toname + strlen(drrb->drr_toname);
	}

	ASSERT(strstr(drrb->drr_toname, sendfs) == drrb->drr_toname);
	ASSERT(chopprefix > drrb->drr_toname \|\| strchr(sendfs, '/') == NULL);
	ASSERT(chopprefix <= drrb->drr_toname + strlen(drrb->drr_toname) \|\|
	strchr(sendfs, '/') == NULL);
	ASSERT(chopprefix[0] == '/' \|\| chopprefix[0] == '@' \|\|
	chopprefix[0] == '\0');

	/*
	* Determine name of destination snapshot.
	*/
	(void) strlcpy(destsnap, tosnap, sizeof (destsnap));
	(void) strlcat(destsnap, chopprefix, sizeof (destsnap));
	free(cp);
	if (!zfs_name_valid(destsnap, ZFS_TYPE_SNAPSHOT)) {
	err = zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
	goto out;
	}

	/*
	* Determine the name of the origin snapshot.
	*/
	if (originsnap) {
	(void) strlcpy(origin, originsnap, sizeof (origin));
	if (flags->verbose)
	(void) printf("using provided clone origin %s\n",
	origin);
	} else if (drrb->drr_flags & DRR_FLAG_CLONE) {
	if (guid_to_name(hdl, destsnap,
	drrb->drr_fromguid, B_FALSE, origin) != 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"local origin for clone %s does not exist"),
	destsnap);
	err = zfs_error(hdl, EZFS_NOENT, errbuf);
	goto out;
	}
	if (flags->verbose)
	(void) printf("found clone origin %s\n", origin);
	}

	if ((DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
	DMU_BACKUP_FEATURE_DEDUP)) {
	(void) fprintf(stderr,
	gettext("ERROR: \"zfs receive\" no longer supports "
	"deduplicated send streams. Use\n"
	"the \"zstream redup\" command to convert this stream "
	"to a regular,\n"
	"non-deduplicated stream.\n"));
	err = zfs_error(hdl, EZFS_NOTSUP, errbuf);
	goto out;
	}

	boolean_t resuming = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
	DMU_BACKUP_FEATURE_RESUMING;
	boolean_t raw = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
	DMU_BACKUP_FEATURE_RAW;
	boolean_t embedded = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
	DMU_BACKUP_FEATURE_EMBED_DATA;
	stream_wantsnewfs = (drrb->drr_fromguid == 0 \|\|
	(drrb->drr_flags & DRR_FLAG_CLONE) \|\| originsnap) && !resuming;
	stream_resumingnewfs = (drrb->drr_fromguid == 0 \|\|
	(drrb->drr_flags & DRR_FLAG_CLONE) \|\| originsnap) && resuming;

	if (stream_wantsnewfs) {
	/*
	* if the parent fs does not exist, look for it based on
	* the parent snap GUID
	*/
	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot receive new filesystem stream"));

	(void) strcpy(name, destsnap);
	cp = strrchr(name, '/');
	if (cp)
	*cp = '\0';
	if (cp &&
	!zfs_dataset_exists(hdl, name, ZFS_TYPE_DATASET)) {
	char suffix[ZFS_MAX_DATASET_NAME_LEN];
	(void) strcpy(suffix, strrchr(destsnap, '/'));
	if (guid_to_name(hdl, name, parent_snapguid,
	B_FALSE, destsnap) == 0) {
	*strchr(destsnap, '@') = '\0';
	(void) strcat(destsnap, suffix);
	}
	}
	} else {
	/*
	* If the fs does not exist, look for it based on the
	* fromsnap GUID.
	*/
	if (resuming) {
	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN,
	"cannot receive resume stream"));
	} else {
	(void) snprintf(errbuf, sizeof (errbuf),
	dgettext(TEXT_DOMAIN,
	"cannot receive incremental stream"));
	}

	(void) strcpy(name, destsnap);
	*strchr(name, '@') = '\0';

	/*
	* If the exact receive path was specified and this is the
	* topmost path in the stream, then if the fs does not exist we
	* should look no further.
	*/
	if ((flags->isprefix \|\| (*(chopprefix = drrb->drr_toname +
	strlen(sendfs)) != '\0' && *chopprefix != '@')) &&
	!zfs_dataset_exists(hdl, name, ZFS_TYPE_DATASET)) {
	char snap[ZFS_MAX_DATASET_NAME_LEN];
	(void) strcpy(snap, strchr(destsnap, '@'));
	if (guid_to_name(hdl, name, drrb->drr_fromguid,
	B_FALSE, destsnap) == 0) {
	*strchr(destsnap, '@') = '\0';
	(void) strcat(destsnap, snap);
	}
	}
	}

	(void) strcpy(name, destsnap);
	*strchr(name, '@') = '\0';

	redacted = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
	DMU_BACKUP_FEATURE_REDACTED;

	if (zfs_dataset_exists(hdl, name, ZFS_TYPE_DATASET)) {
	zfs_cmd_t zc = {"\0"};
	zfs_handle_t *zhp;
	boolean_t encrypted;

	(void) strcpy(zc.zc_name, name);

	/*
	* Destination fs exists. It must be one of these cases:
	* - an incremental send stream
	* - the stream specifies a new fs (full stream or clone)
	* and they want us to blow away the existing fs (and
	* have therefore specified -F and removed any snapshots)
	* - we are resuming a failed receive.
	*/
	if (stream_wantsnewfs) {
	boolean_t is_volume = drrb->drr_type == DMU_OST_ZVOL;
	if (!flags->force) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination '%s' exists\n"
	"must specify -F to overwrite it"), name);
	err = zfs_error(hdl, EZFS_EXISTS, errbuf);
	goto out;
	}
	if (zfs_ioctl(hdl, ZFS_IOC_SNAPSHOT_LIST_NEXT,
	&zc) == 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination has snapshots (eg. %s)\n"
	"must destroy them to overwrite it"),
	zc.zc_name);
	err = zfs_error(hdl, EZFS_EXISTS, errbuf);
	goto out;
	}
	if (is_volume && strrchr(name, '/') == NULL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination %s is the root dataset\n"
	"cannot overwrite with a ZVOL"),
	name);
	err = zfs_error(hdl, EZFS_EXISTS, errbuf);
	goto out;
	}
	if (is_volume &&
	zfs_ioctl(hdl, ZFS_IOC_DATASET_LIST_NEXT,
	&zc) == 0) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination has children (eg. %s)\n"
	"cannot overwrite with a ZVOL"),
	zc.zc_name);
	err = zfs_error(hdl, EZFS_WRONG_PARENT, errbuf);
	goto out;
	}
	}

	if ((zhp = zfs_open(hdl, name,
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME)) == NULL) {
	err = -1;
	goto out;
	}

	if (stream_wantsnewfs &&
	zhp->zfs_dmustats.dds_origin[0]) {
	zfs_close(zhp);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination '%s' is a clone\n"
	"must destroy it to overwrite it"), name);
	err = zfs_error(hdl, EZFS_EXISTS, errbuf);
	goto out;
	}

	/*
	* Raw sends can not be performed as an incremental on top
	* of existing unencrypted datasets. zfs recv -F can't be
	* used to blow away an existing encrypted filesystem. This
	* is because it would require the dsl dir to point to the
	* new key (or lack of a key) and the old key at the same
	* time. The -F flag may still be used for deleting
	* intermediate snapshots that would otherwise prevent the
	* receive from working.
	*/
	encrypted = zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) !=
	ZIO_CRYPT_OFF;
	if (!stream_wantsnewfs && !encrypted && raw) {
	zfs_close(zhp);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"cannot perform raw receive on top of "
	"existing unencrypted dataset"));
	err = zfs_error(hdl, EZFS_BADRESTORE, errbuf);
	goto out;
	}

	if (stream_wantsnewfs && flags->force &&
	((raw && !encrypted) \|\| encrypted)) {
	zfs_close(zhp);
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"zfs receive -F cannot be used to destroy an "
	"encrypted filesystem or overwrite an "
	"unencrypted one with an encrypted one"));
	err = zfs_error(hdl, EZFS_BADRESTORE, errbuf);
	goto out;
	}

	if (!flags->dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
	(stream_wantsnewfs \|\| stream_resumingnewfs)) {
	/* We can't do online recv in this case */
	clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
	flags->forceunmount ? MS_FORCE : 0);
	if (clp == NULL) {
	zfs_close(zhp);
	err = -1;
	goto out;
	}
	if (changelist_prefix(clp) != 0) {
	changelist_free(clp);
	zfs_close(zhp);
	err = -1;
	goto out;
	}
	}

	/*
	* If we are resuming a newfs, set newfs here so that we will
	* mount it if the recv succeeds this time. We can tell
	* that it was a newfs on the first recv because the fs
	* itself will be inconsistent (if the fs existed when we
	* did the first recv, we would have received it into
	* .../%recv).
	*/
	if (resuming && zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT))
	newfs = B_TRUE;

	/* we want to know if we're zoned when validating -o\|-x props */
	zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);

	/* may need this info later, get it now we have zhp around */
	if (zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN, NULL, 0,
	NULL, NULL, 0, B_TRUE) == 0)
	hastoken = B_TRUE;

	/* gather existing properties on destination */
	origprops = fnvlist_alloc();
	fnvlist_merge(origprops, zhp->zfs_props);
	fnvlist_merge(origprops, zhp->zfs_user_props);

	zfs_close(zhp);
	} else {
	zfs_handle_t *zhp;

	/*
	* Destination filesystem does not exist. Therefore we better
	* be creating a new filesystem (either from a full backup, or
	* a clone). It would therefore be invalid if the user
	* specified only the pool name (i.e. if the destination name
	* contained no slash character).
	*/
	cp = strrchr(name, '/');

	if (!stream_wantsnewfs \|\| cp == NULL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination '%s' does not exist"), name);
	err = zfs_error(hdl, EZFS_NOENT, errbuf);
	goto out;
	}

	/*
	* Trim off the final dataset component so we perform the
	* recvbackup ioctl to the filesystems's parent.
	*/
	*cp = '\0';

	if (flags->isprefix && !flags->istail && !flags->dryrun &&
	create_parents(hdl, destsnap, strlen(tosnap)) != 0) {
	err = zfs_error(hdl, EZFS_BADRESTORE, errbuf);
	goto out;
	}

	/* validate parent */
	zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
	if (zhp == NULL) {
	err = zfs_error(hdl, EZFS_BADRESTORE, errbuf);
	goto out;
	}
	if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"parent '%s' is not a filesystem"), name);
	err = zfs_error(hdl, EZFS_WRONG_PARENT, errbuf);
	zfs_close(zhp);
	goto out;
	}

	zfs_close(zhp);

	newfs = B_TRUE;
	*cp = '/';
	}

	if (flags->verbose) {
	(void) printf("%s %s stream of %s into %s\n",
	flags->dryrun ? "would receive" : "receiving",
	drrb->drr_fromguid ? "incremental" : "full",
	drrb->drr_toname, destsnap);
	(void) fflush(stdout);
	}

	/*
	* If this is the top-level dataset, record it so we can use it
	* for recursive operations later.
	*/
	if (top_zfs != NULL &&
	(top_zfs == NULL \|\| strcmp(top_zfs, name) == 0)) {
	toplevel = B_TRUE;
	if (*top_zfs == NULL)
	*top_zfs = zfs_strdup(hdl, name);
	}

	if (drrb->drr_type == DMU_OST_ZVOL) {
	type = ZFS_TYPE_VOLUME;
	} else if (drrb->drr_type == DMU_OST_ZFS) {
	type = ZFS_TYPE_FILESYSTEM;
	} else {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"invalid record type: 0x%d"), drrb->drr_type);
	err = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	goto out;
	}
	if ((err = zfs_setup_cmdline_props(hdl, type, name, zoned, recursive,
	stream_wantsnewfs, raw, toplevel, rcvprops, cmdprops, origprops,
	&oxprops, &wkeydata, &wkeylen, errbuf)) != 0)
	goto out;

	/*
	* When sending with properties (zfs send -p), the encryption property
	* is not included because it is a SETONCE property and therefore
	* treated as read only. However, we are always able to determine its
	* value because raw sends will include it in the DRR_BDEGIN payload
	* and non-raw sends with properties are not allowed for encrypted
	* datasets. Therefore, if this is a non-raw properties stream, we can
	* infer that the value should be ZIO_CRYPT_OFF and manually add that
	* to the received properties.
	*/
	if (stream_wantsnewfs && !raw && rcvprops != NULL &&
	!nvlist_exists(cmdprops, zfs_prop_to_name(ZFS_PROP_ENCRYPTION))) {
	if (oxprops == NULL)
	oxprops = fnvlist_alloc();
	fnvlist_add_uint64(oxprops,
	zfs_prop_to_name(ZFS_PROP_ENCRYPTION), ZIO_CRYPT_OFF);
	}

	if (flags->dryrun) {
	void *buf = zfs_alloc(hdl, SPA_MAXBLOCKSIZE);

	/*
	* We have read the DRR_BEGIN record, but we have
	* not yet read the payload. For non-dryrun sends
	* this will be done by the kernel, so we must
	* emulate that here, before attempting to read
	* more records.
	*/
	err = recv_read(hdl, infd, buf, drr->drr_payloadlen,
	flags->byteswap, NULL);
	free(buf);
	if (err != 0)
	goto out;

	err = recv_skip(hdl, infd, flags->byteswap);
	goto out;
	}

	err = ioctl_err = lzc_receive_with_cmdprops(destsnap, rcvprops,
	oxprops, wkeydata, wkeylen, origin, flags->force, flags->resumable,
	raw, infd, drr_noswap, -1, &read_bytes, &errflags,
	NULL, &prop_errors);
	ioctl_errno = ioctl_err;
	prop_errflags = errflags;

	if (err == 0) {
	nvpair_t *prop_err = NULL;

	while ((prop_err = nvlist_next_nvpair(prop_errors,
	prop_err)) != NULL) {
	char tbuf[1024];
	zfs_prop_t prop;
	int intval;

	prop = zfs_name_to_prop(nvpair_name(prop_err));
	(void) nvpair_value_int32(prop_err, &intval);
	if (strcmp(nvpair_name(prop_err),
	ZPROP_N_MORE_ERRORS) == 0) {
	trunc_prop_errs(intval);
	break;
	} else if (snapname == NULL \|\| finalsnap == NULL \|\|
	strcmp(finalsnap, snapname) == 0 \|\|
	strcmp(nvpair_name(prop_err),
	zfs_prop_to_name(ZFS_PROP_REFQUOTA)) != 0) {
	/*
	* Skip the special case of, for example,
	* "refquota", errors on intermediate
	* snapshots leading up to a final one.
	* That's why we have all of the checks above.
	*
	* See zfs_ioctl.c's extract_delay_props() for
	* a list of props which can fail on
	* intermediate snapshots, but shouldn't
	* affect the overall receive.
	*/
	(void) snprintf(tbuf, sizeof (tbuf),
	dgettext(TEXT_DOMAIN,
	"cannot receive %s property on %s"),
	nvpair_name(prop_err), name);
	zfs_setprop_error(hdl, prop, intval, tbuf);
	}
	}
	}

	if (err == 0 && snapprops_nvlist) {
	zfs_cmd_t zc = {"\0"};

	(void) strcpy(zc.zc_name, destsnap);
	zc.zc_cookie = B_TRUE; /* received */
	if (zcmd_write_src_nvlist(hdl, &zc, snapprops_nvlist) == 0) {
	(void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
	zcmd_free_nvlists(&zc);
	}
	}
	if (err == 0 && snapholds_nvlist) {
	nvpair_t *pair;
	nvlist_t holds, errors = NULL;
	int cleanup_fd = -1;

	VERIFY(0 == nvlist_alloc(&holds, 0, KM_SLEEP));
	for (pair = nvlist_next_nvpair(snapholds_nvlist, NULL);
	pair != NULL;
	pair = nvlist_next_nvpair(snapholds_nvlist, pair)) {
	fnvlist_add_string(holds, destsnap, nvpair_name(pair));
	}
	(void) lzc_hold(holds, cleanup_fd, &errors);
	fnvlist_free(snapholds_nvlist);
	fnvlist_free(holds);
	}

	if (err && (ioctl_errno == ENOENT \|\| ioctl_errno == EEXIST)) {
	/*
	* It may be that this snapshot already exists,
	* in which case we want to consume & ignore it
	* rather than failing.
	*/
	avl_tree_t *local_avl;
	nvlist_t local_nv, fs;
	cp = strchr(destsnap, '@');

	/*
	* XXX Do this faster by just iterating over snaps in
	* this fs. Also if zc_value does not exist, we will
	* get a strange "does not exist" error message.
	*/
	*cp = '\0';
	if (gather_nvlist(hdl, destsnap, NULL, NULL, B_FALSE, B_TRUE,
	B_FALSE, B_FALSE, B_FALSE, B_FALSE, B_FALSE, B_FALSE,
	B_TRUE, &local_nv, &local_avl) == 0) {
	*cp = '@';
	fs = fsavl_find(local_avl, drrb->drr_toguid, NULL);
	fsavl_destroy(local_avl);
	fnvlist_free(local_nv);

	if (fs != NULL) {
	if (flags->verbose) {
	(void) printf("snap %s already exists; "
	"ignoring\n", destsnap);
	}
	err = ioctl_err = recv_skip(hdl, infd,
	flags->byteswap);
	}
	}
	*cp = '@';
	}

	if (ioctl_err != 0) {
	switch (ioctl_errno) {
	case ENODEV:
	cp = strchr(destsnap, '@');
	*cp = '\0';
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"most recent snapshot of %s does not\n"
	"match incremental source"), destsnap);
	(void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
	*cp = '@';
	break;
	case ETXTBSY:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination %s has been modified\n"
	"since most recent snapshot"), name);
	(void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
	break;
	case EACCES:
	if (raw && stream_wantsnewfs) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"failed to create encryption key"));
	} else if (raw && !stream_wantsnewfs) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"encryption key does not match "
	"existing key"));
	} else {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"inherited key must be loaded"));
	}
	(void) zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf);
	break;
	case EEXIST:
	cp = strchr(destsnap, '@');
	if (newfs) {
	/* it's the containing fs that exists */
	*cp = '\0';
	}
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination already exists"));
	(void) zfs_error_fmt(hdl, EZFS_EXISTS,
	dgettext(TEXT_DOMAIN, "cannot restore to %s"),
	destsnap);
	*cp = '@';
	break;
	case EINVAL:
	if (flags->resumable) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"kernel modules must be upgraded to "
	"receive this stream."));
	} else if (embedded && !raw) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incompatible embedded data stream "
	"feature with encrypted receive."));
	}
	(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	break;
	case ECKSUM:
	case ZFS_ERR_STREAM_TRUNCATED:
	recv_ecksum_set_aux(hdl, destsnap, flags->resumable,
	ioctl_err == ECKSUM);
	(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	break;
	case ZFS_ERR_STREAM_LARGE_BLOCK_MISMATCH:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"incremental send stream requires -L "
	"(--large-block), to match previous receive."));
	(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	break;
	case ENOTSUP:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"pool must be upgraded to receive this stream."));
	(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
	break;
	case EDQUOT:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination %s space quota exceeded."), name);
	(void) zfs_error(hdl, EZFS_NOSPC, errbuf);
	break;
	case ZFS_ERR_FROM_IVSET_GUID_MISSING:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"IV set guid missing. See errata %u at "
	"https://openzfs.github.io/openzfs-docs/msg/"
	"ZFS-8000-ER."),
	ZPOOL_ERRATA_ZOL_8308_ENCRYPTION);
	(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	break;
	case ZFS_ERR_FROM_IVSET_GUID_MISMATCH:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"IV set guid mismatch. See the 'zfs receive' "
	"man page section\n discussing the limitations "
	"of raw encrypted send streams."));
	(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	break;
	case ZFS_ERR_SPILL_BLOCK_FLAG_MISSING:
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"Spill block flag missing for raw send.\n"
	"The zfs software on the sending system must "
	"be updated."));
	(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
	break;
	case EBUSY:
	if (hastoken) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"destination %s contains "
	"partially-complete state from "
	"\"zfs receive -s\"."), name);
	(void) zfs_error(hdl, EZFS_BUSY, errbuf);
	break;
	}
	/* fallthru */
	default:
	(void) zfs_standard_error(hdl, ioctl_errno, errbuf);
	}
	}

	/*
	* Mount the target filesystem (if created). Also mount any
	* children of the target filesystem if we did a replication
	* receive (indicated by stream_avl being non-NULL).
	*/
	if (clp) {
	if (!flags->nomount)
	err \|= changelist_postfix(clp);
	changelist_free(clp);
	}

	if ((newfs \|\| stream_avl) && type == ZFS_TYPE_FILESYSTEM && !redacted)
	flags->domount = B_TRUE;

	if (prop_errflags & ZPROP_ERR_NOCLEAR) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
	"failed to clear unreceived properties on %s"), name);
	(void) fprintf(stderr, "\n");
	}
	if (prop_errflags & ZPROP_ERR_NORESTORE) {
	(void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
	"failed to restore original properties on %s"), name);
	(void) fprintf(stderr, "\n");
	}

	if (err \|\| ioctl_err) {
	err = -1;
	goto out;
	}

	if (flags->verbose) {
	char buf1[64];
	char buf2[64];
	uint64_t bytes = read_bytes;
	time_t delta = time(NULL) - begin_time;
	if (delta == 0)
	delta = 1;
	zfs_nicebytes(bytes, buf1, sizeof (buf1));
	zfs_nicebytes(bytes/delta, buf2, sizeof (buf1));

	(void) printf("received %s stream in %lld seconds (%s/sec)\n",
	buf1, (longlong_t)delta, buf2);
	}

	err = 0;
	out:
	if (prop_errors != NULL)
	fnvlist_free(prop_errors);

	if (tmp_keylocation[0] != '\0') {
	fnvlist_add_string(rcvprops,
	zfs_prop_to_name(ZFS_PROP_KEYLOCATION), tmp_keylocation);
	}

	if (newprops)
	fnvlist_free(rcvprops);

	fnvlist_free(oxprops);
	fnvlist_free(origprops);

	return (err);
	}

	/*
	* Check properties we were asked to override (both -o\|-x)
	*/
	static boolean_t
	zfs_receive_checkprops(libzfs_handle_t hdl, nvlist_t props,
	const char *errbuf)
	{
	nvpair_t *nvp;
	zfs_prop_t prop;
	const char *name;

	nvp = NULL;
	while ((nvp = nvlist_next_nvpair(props, nvp)) != NULL) {
	name = nvpair_name(nvp);
	prop = zfs_name_to_prop(name);

	if (prop == ZPROP_INVAL) {
	if (!zfs_prop_user(name)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"invalid property '%s'"), name);
	return (B_FALSE);
	}
	continue;
	}
	/*
	* "origin" is readonly but is used to receive datasets as
	* clones so we don't raise an error here
	*/
	if (prop == ZFS_PROP_ORIGIN)
	continue;

	/* encryption params have their own verification later */
	if (prop == ZFS_PROP_ENCRYPTION \|\|
	zfs_prop_encryption_key_param(prop))
	continue;

	/*
	* cannot override readonly, set-once and other specific
	* settable properties
	*/
	if (zfs_prop_readonly(prop) \|\| prop == ZFS_PROP_VERSION \|\|
	prop == ZFS_PROP_VOLSIZE) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"invalid property '%s'"), name);
	return (B_FALSE);
	}
	}

	return (B_TRUE);
	}

	static int
	zfs_receive_impl(libzfs_handle_t hdl, const char tosnap,
	const char originsnap, recvflags_t flags, int infd, const char *sendfs,
	nvlist_t stream_nv, avl_tree_t stream_avl, char **top_zfs,
	const char finalsnap, nvlist_t cmdprops)
	{
	int err;
	dmu_replay_record_t drr, drr_noswap;
	struct drr_begin *drrb = &drr.drr_u.drr_begin;
	char errbuf[1024];
	zio_cksum_t zcksum = { { 0 } };
	uint64_t featureflags;
	int hdrtype;

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	"cannot receive"));

	/* check cmdline props, raise an error if they cannot be received */
	if (!zfs_receive_checkprops(hdl, cmdprops, errbuf)) {
	return (zfs_error(hdl, EZFS_BADPROP, errbuf));
	}

	if (flags->isprefix &&
	!zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs "
	"(%s) does not exist"), tosnap);
	return (zfs_error(hdl, EZFS_NOENT, errbuf));
	}
	if (originsnap &&
	!zfs_dataset_exists(hdl, originsnap, ZFS_TYPE_DATASET)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified origin fs "
	"(%s) does not exist"), originsnap);
	return (zfs_error(hdl, EZFS_NOENT, errbuf));
	}

	/* read in the BEGIN record */
	if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE,
	&zcksum)))
	return (err);

	if (drr.drr_type == DRR_END \|\| drr.drr_type == BSWAP_32(DRR_END)) {
	/* It's the double end record at the end of a package */
	return (ENODATA);
	}

	/* the kernel needs the non-byteswapped begin record */
	drr_noswap = drr;

	flags->byteswap = B_FALSE;
	if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
	/*
	* We computed the checksum in the wrong byteorder in
	* recv_read() above; do it again correctly.
	*/
	bzero(&zcksum, sizeof (zio_cksum_t));
	fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum);
	flags->byteswap = B_TRUE;

	drr.drr_type = BSWAP_32(drr.drr_type);
	drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen);
	drrb->drr_magic = BSWAP_64(drrb->drr_magic);
	drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
	drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
	drrb->drr_type = BSWAP_32(drrb->drr_type);
	drrb->drr_flags = BSWAP_32(drrb->drr_flags);
	drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
	drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
	}

	if (drrb->drr_magic != DMU_BACKUP_MAGIC \|\| drr.drr_type != DRR_BEGIN) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
	"stream (bad magic number)"));
	return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
	}

	featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
	hdrtype = DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo);

	if (!DMU_STREAM_SUPPORTED(featureflags) \|\|
	(hdrtype != DMU_SUBSTREAM && hdrtype != DMU_COMPOUNDSTREAM)) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
	"stream has unsupported feature, feature flags = %llx"),
	(unsigned long long)featureflags);
	return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
	}

	/* Holds feature is set once in the compound stream header. */
	if (featureflags & DMU_BACKUP_FEATURE_HOLDS)
	flags->holds = B_TRUE;

	if (strchr(drrb->drr_toname, '@') == NULL) {
	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
	"stream (bad snapshot name)"));
	return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
	}

	if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == DMU_SUBSTREAM) {
	char nonpackage_sendfs[ZFS_MAX_DATASET_NAME_LEN];
	if (sendfs == NULL) {
	/*
	* We were not called from zfs_receive_package(). Get
	* the fs specified by 'zfs send'.
	*/
	char *cp;
	(void) strlcpy(nonpackage_sendfs,
	drr.drr_u.drr_begin.drr_toname,
	sizeof (nonpackage_sendfs));
	if ((cp = strchr(nonpackage_sendfs, '@')) != NULL)
	*cp = '\0';
	sendfs = nonpackage_sendfs;
	VERIFY(finalsnap == NULL);
	}
	return (zfs_receive_one(hdl, infd, tosnap, originsnap, flags,
	&drr, &drr_noswap, sendfs, stream_nv, stream_avl, top_zfs,
	finalsnap, cmdprops));
	} else {
	assert(DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
	DMU_COMPOUNDSTREAM);
	return (zfs_receive_package(hdl, infd, tosnap, flags, &drr,
	&zcksum, top_zfs, cmdprops));
	}
	}

	/*
	* Restores a backup of tosnap from the file descriptor specified by infd.
	* Return 0 on total success, -2 if some things couldn't be
	* destroyed/renamed/promoted, -1 if some things couldn't be received.
	* (-1 will override -2, if -1 and the resumable flag was specified the
	* transfer can be resumed if the sending side supports it).
	*/
	int
	zfs_receive(libzfs_handle_t hdl, const char tosnap, nvlist_t *props,
	recvflags_t flags, int infd, avl_tree_t stream_avl)
	{
	char *top_zfs = NULL;
	int err;
	struct stat sb;
	char *originsnap = NULL;

	/*
	* The only way fstat can fail is if we do not have a valid file
	* descriptor.
	*/
	if (fstat(infd, &sb) == -1) {
	perror("fstat");
	return (-2);
	}

	/*
	* It is not uncommon for gigabytes to be processed in zfs receive.
	* Speculatively increase the buffer size if supported by the platform.
	*/
	if (S_ISFIFO(sb.st_mode))
	libzfs_set_pipe_max(infd);

	if (props) {
	err = nvlist_lookup_string(props, "origin", &originsnap);
	if (err && err != ENOENT)
	return (err);
	}

	err = zfs_receive_impl(hdl, tosnap, originsnap, flags, infd, NULL, NULL,
	stream_avl, &top_zfs, NULL, props);

	if (err == 0 && !flags->nomount && flags->domount && top_zfs) {
	zfs_handle_t *zhp = NULL;
	prop_changelist_t *clp = NULL;

	zhp = zfs_open(hdl, top_zfs,
	ZFS_TYPE_FILESYSTEM \| ZFS_TYPE_VOLUME);
	if (zhp == NULL) {
	err = -1;
	goto out;
	} else {
	if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
	zfs_close(zhp);
	goto out;
	}

	clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT,
	CL_GATHER_MOUNT_ALWAYS,
	flags->forceunmount ? MS_FORCE : 0);
	zfs_close(zhp);
	if (clp == NULL) {
	err = -1;
	goto out;
	}

	/* mount and share received datasets */
	err = changelist_postfix(clp);
	changelist_free(clp);
	if (err != 0)
	err = -1;
	}
	}

	out:
	if (top_zfs)
	free(top_zfs);

	return (err);
	}
	diff --git a/sys/contrib/openzfs/lib/libzfs_core/libzfs_core.abi b/sys/contrib/openzfs/lib/libzfs_core/libzfs_core.abi
	index 02627e229417..ce9cc89f019b 100644
	--- a/sys/contrib/openzfs/lib/libzfs_core/libzfs_core.abi
	+++ b/sys/contrib/openzfs/lib/libzfs_core/libzfs_core.abi
	@@ -1,2820 +1,5129 @@
	-<abi-corpus path='libzfs_core.so' architecture='elf-amd-x86_64' soname='libzfs_core.so.3'>
	+<abi-corpus architecture='elf-amd-x86_64' soname='libzfs_core.so.3'>
	<elf-needed>
	<dependency name='libuuid.so.1'/>
	<dependency name='libz.so.1'/>
	+ <dependency name='librt.so.1'/>
	<dependency name='libm.so.6'/>
	<dependency name='libblkid.so.1'/>
	<dependency name='libudev.so.1'/>
	<dependency name='libnvpair.so.3'/>
	- <dependency name='libtirpc.so.3'/>
	<dependency name='libpthread.so.0'/>
	<dependency name='libc.so.6'/>
	<dependency name='ld-linux-x86-64.so.2'/>
	</elf-needed>
	<elf-function-symbols>
	+ <elf-symbol name='_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='_sol_getmntent' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_32' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_int' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_64' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_ptr,atomic_add_long' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_char_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_add_char' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_8' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_char' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_char_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_int' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_int_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_32_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_int_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_long' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_long_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_64_nv,atomic_add_ptr_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_long_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_ptr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_add_ptr_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_add_short' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_16' is-defined='yes'/>
	- <elf-symbol name='atomic_add_short_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_add_16_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_short' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_add_short_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_ushort_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_64' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_ulong' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_uchar' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_8_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_and_uint' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_32' is-defined='yes'/>
	- <elf-symbol name='atomic_and_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_32_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_and_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_64_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_and_ushort' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_and_16' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_and_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_and_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_cas_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_cas_ushort' is-defined='yes'/>
	+ <elf-symbol name='atomic_cas_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_cas_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_cas_uchar' is-defined='yes'/>
	+ <elf-symbol name='atomic_cas_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_ptr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_cas_uint' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_cas_32' is-defined='yes'/>
	- <elf-symbol name='atomic_cas_ulong' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_cas_ptr,atomic_cas_64' is-defined='yes'/>
	+ <elf-symbol name='atomic_cas_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_cas_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_cas_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_clear_long_excl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_ushort' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_64' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_ulong' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_uchar' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_uchar_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_uint' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_32' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_32_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_64_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_dec_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_dec_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_dec_16_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_dec_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_32' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_uint' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_uint_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_ulong_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_uchar_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_uchar' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_8' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_ulong' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_64' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_inc_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_ushort' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_16' is-defined='yes'/>
	- <elf-symbol name='atomic_inc_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_inc_16_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_or_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_ushort' is-defined='yes'/>
	- <elf-symbol name='atomic_or_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_ushort_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_or_32' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_uint' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_inc_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_or_64' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_ulong' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_or_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_uchar' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_or_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_8_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_uchar_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_or_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_32_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_uint_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_or_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_or_64_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_or_ulong_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_or_ushort_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_set_long_excl' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_short' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_short_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_16_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_int_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_32_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_64_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_char' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_8_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_char' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_char_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_8_nv' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_int' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_32' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_char_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_int' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_int_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_long' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_64,atomic_sub_ptr' is-defined='yes'/>
	- <elf-symbol name='atomic_sub_long_nv' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_sub_64_nv,atomic_sub_ptr_nv' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_long' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_sub_long_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_ptr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_ptr_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_short' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_sub_short_nv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_swap_16' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_swap_ushort' is-defined='yes'/>
	+ <elf-symbol name='atomic_swap_16' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_32' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_swap_8' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_swap_uchar' is-defined='yes'/>
	+ <elf-symbol name='atomic_swap_8' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_ptr' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_uchar' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	- <elf-symbol name='atomic_swap_uint' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_swap_32' is-defined='yes'/>
	- <elf-symbol name='atomic_swap_ulong' type='func-type' binding='global-binding' visibility='default-visibility' alias='atomic_swap_64,atomic_swap_ptr' is-defined='yes'/>
	+ <elf-symbol name='atomic_swap_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='atomic_swap_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='atomic_swap_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_add' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_destroy_nodes' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_find' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_first' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_insert' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_insert_here' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_is_empty' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_last' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_nearest' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_numnodes' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_remove' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_swap' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_update' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_update_gt' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_update_lt' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='avl_walk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_alloc_and_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_alloc_and_read' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_auto_sense' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_err_check' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_free' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_rescan' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_type' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_use_whole_disk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='efi_write' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='get_system_hostid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getexecname' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getextmntent' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getmntany' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='getzoneid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='is_mpath_whole_disk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='label_paths' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libspl_assertf' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_core_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='libzfs_core_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_head' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_insert_after' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_insert_before' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_insert_head' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_insert_tail' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_is_empty' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_link_active' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_link_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_link_replace' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_move_tail' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_next' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_prev' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_remove' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_remove_head' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_remove_tail' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='list_tail' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_bookmark' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_change_key' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_channel_program' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_channel_program_nosync' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_clone' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_create' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_destroy' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_destroy_bookmarks' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_destroy_snaps' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_exists' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_get_bookmark_props' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_get_bookmarks' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_get_bootenv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_get_holds' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_hold' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_initialize' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_load_key' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_pool_checkpoint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_pool_checkpoint_discard' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_promote' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_receive' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_receive_one' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_receive_resumable' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_receive_with_cmdprops' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_receive_with_header' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_redact' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_release' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_rename' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_reopen' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_rollback' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_rollback_to' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_send' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_send_redacted' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_send_resume' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_send_resume_redacted' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_send_space' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_send_space_resume_redacted' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzc_set_bootenv' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='28577a57' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_16' mangled-name='atomic_add_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='23bd8cb5' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_short' mangled-name='atomic_add_short' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_short'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='a2185560' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_32' mangled-name='atomic_add_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='3ff5601b' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_int' mangled-name='atomic_add_int' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_int'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='95e97e5e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_long' mangled-name='atomic_add_long' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_long'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='bd54fe1a' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_64' mangled-name='atomic_add_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9da381c4' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_ptr' mangled-name='atomic_add_ptr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_ptr'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='79a0948f' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_8' mangled-name='atomic_sub_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='ee31ee44' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_char' mangled-name='atomic_sub_char' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_char'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='28577a57' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_16' mangled-name='atomic_sub_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='23bd8cb5' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_short' mangled-name='atomic_sub_short' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_short'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='a2185560' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_32' mangled-name='atomic_sub_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='3ff5601b' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_int' mangled-name='atomic_sub_int' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_int'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='95e97e5e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_long' mangled-name='atomic_sub_long' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_long'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='bd54fe1a' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_64' mangled-name='atomic_sub_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9da381c4' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_ptr' mangled-name='atomic_sub_ptr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_ptr'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='79a0948f' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_8' mangled-name='atomic_or_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_uchar' mangled-name='atomic_or_uchar' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_uchar'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_16' mangled-name='atomic_or_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_ushort' mangled-name='atomic_or_ushort' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_ushort'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_32' mangled-name='atomic_or_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_uint' mangled-name='atomic_or_uint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_uint'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_ulong' mangled-name='atomic_or_ulong' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_ulong'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_64' mangled-name='atomic_or_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_8' mangled-name='atomic_and_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_uchar' mangled-name='atomic_and_uchar' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_uchar'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_16' mangled-name='atomic_and_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_ushort' mangled-name='atomic_and_ushort' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_ushort'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_32' mangled-name='atomic_and_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_uint' mangled-name='atomic_and_uint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_uint'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_ulong' mangled-name='atomic_and_ulong' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_ulong'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_64' mangled-name='atomic_and_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_8_nv' mangled-name='atomic_inc_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_uchar_nv' mangled-name='atomic_inc_uchar_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_uchar_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_16_nv' mangled-name='atomic_inc_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_ushort_nv' mangled-name='atomic_inc_ushort_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_ushort_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_32_nv' mangled-name='atomic_inc_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_uint_nv' mangled-name='atomic_inc_uint_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_uint_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_ulong_nv' mangled-name='atomic_inc_ulong_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_ulong_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_inc_64_nv' mangled-name='atomic_inc_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_inc_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_8_nv' mangled-name='atomic_dec_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_uchar_nv' mangled-name='atomic_dec_uchar_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_uchar_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_16_nv' mangled-name='atomic_dec_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_ushort_nv' mangled-name='atomic_dec_ushort_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_ushort_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_32_nv' mangled-name='atomic_dec_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_uint_nv' mangled-name='atomic_dec_uint_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_uint_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_ulong_nv' mangled-name='atomic_dec_ulong_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_ulong_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_dec_64_nv' mangled-name='atomic_dec_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_dec_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_8_nv' mangled-name='atomic_add_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='ee31ee44' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_char_nv' mangled-name='atomic_add_char_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_char_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='28577a57' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_16_nv' mangled-name='atomic_add_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='23bd8cb5' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_short_nv' mangled-name='atomic_add_short_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_short_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='a2185560' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_32_nv' mangled-name='atomic_add_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='3ff5601b' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_int_nv' mangled-name='atomic_add_int_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_int_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='95e97e5e' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_long_nv' mangled-name='atomic_add_long_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_long_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='bd54fe1a' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_64_nv' mangled-name='atomic_add_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9da381c4' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_add_ptr_nv' mangled-name='atomic_add_ptr_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_add_ptr_nv'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='79a0948f' name='bits'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_8_nv' mangled-name='atomic_sub_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='ee31ee44' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_char_nv' mangled-name='atomic_sub_char_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_char_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='28577a57' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_16_nv' mangled-name='atomic_sub_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='23bd8cb5' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_short_nv' mangled-name='atomic_sub_short_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_short_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='a2185560' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_32_nv' mangled-name='atomic_sub_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='3ff5601b' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_int_nv' mangled-name='atomic_sub_int_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_int_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='95e97e5e' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_long_nv' mangled-name='atomic_sub_long_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_long_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='bd54fe1a' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_64_nv' mangled-name='atomic_sub_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9da381c4' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_sub_ptr_nv' mangled-name='atomic_sub_ptr_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_sub_ptr_nv'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='79a0948f' name='bits'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_8_nv' mangled-name='atomic_or_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_uchar_nv' mangled-name='atomic_or_uchar_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_uchar_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_16_nv' mangled-name='atomic_or_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_ushort_nv' mangled-name='atomic_or_ushort_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_ushort_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_32_nv' mangled-name='atomic_or_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_uint_nv' mangled-name='atomic_or_uint_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_uint_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_ulong_nv' mangled-name='atomic_or_ulong_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_ulong_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_or_64_nv' mangled-name='atomic_or_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_or_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_8_nv' mangled-name='atomic_and_8_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_8_nv'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_uchar_nv' mangled-name='atomic_and_uchar_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_uchar_nv'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_16_nv' mangled-name='atomic_and_16_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_16_nv'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_ushort_nv' mangled-name='atomic_and_ushort_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_ushort_nv'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_32_nv' mangled-name='atomic_and_32_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_32_nv'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_uint_nv' mangled-name='atomic_and_uint_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_uint_nv'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_ulong_nv' mangled-name='atomic_and_ulong_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_ulong_nv'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_and_64_nv' mangled-name='atomic_and_64_nv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_and_64_nv'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_8' mangled-name='atomic_cas_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='exp'/>
	+ <parameter type-id='b96825af' name='des'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_uchar' mangled-name='atomic_cas_uchar' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_uchar'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='exp'/>
	+ <parameter type-id='d8bf0010' name='des'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_16' mangled-name='atomic_cas_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='exp'/>
	+ <parameter type-id='149c6638' name='des'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_ushort' mangled-name='atomic_cas_ushort' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_ushort'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='exp'/>
	+ <parameter type-id='d908a348' name='des'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_32' mangled-name='atomic_cas_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='exp'/>
	+ <parameter type-id='8f92235e' name='des'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_uint' mangled-name='atomic_cas_uint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_uint'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='exp'/>
	+ <parameter type-id='3502e3ff' name='des'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_ulong' mangled-name='atomic_cas_ulong' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_ulong'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='exp'/>
	+ <parameter type-id='ee1f298e' name='des'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_64' mangled-name='atomic_cas_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='exp'/>
	+ <parameter type-id='9c313c2d' name='des'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_cas_ptr' mangled-name='atomic_cas_ptr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_cas_ptr'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='eaa32e2f' name='exp'/>
	+ <parameter type-id='eaa32e2f' name='des'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_8' mangled-name='atomic_swap_8' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_8'>
	+ <parameter type-id='aa323ea4' name='target'/>
	+ <parameter type-id='b96825af' name='bits'/>
	+ <return type-id='b96825af'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_uchar' mangled-name='atomic_swap_uchar' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_uchar'>
	+ <parameter type-id='b663a671' name='target'/>
	+ <parameter type-id='d8bf0010' name='bits'/>
	+ <return type-id='d8bf0010'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_16' mangled-name='atomic_swap_16' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_16'>
	+ <parameter type-id='93977ae7' name='target'/>
	+ <parameter type-id='149c6638' name='bits'/>
	+ <return type-id='149c6638'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_ushort' mangled-name='atomic_swap_ushort' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_ushort'>
	+ <parameter type-id='8e6fdc53' name='target'/>
	+ <parameter type-id='d908a348' name='bits'/>
	+ <return type-id='d908a348'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_32' mangled-name='atomic_swap_32' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_32'>
	+ <parameter type-id='3a147f31' name='target'/>
	+ <parameter type-id='8f92235e' name='bits'/>
	+ <return type-id='8f92235e'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_uint' mangled-name='atomic_swap_uint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_uint'>
	+ <parameter type-id='0ea19dfa' name='target'/>
	+ <parameter type-id='3502e3ff' name='bits'/>
	+ <return type-id='3502e3ff'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_ulong' mangled-name='atomic_swap_ulong' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_ulong'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='ee1f298e' name='bits'/>
	+ <return type-id='ee1f298e'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_64' mangled-name='atomic_swap_64' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_64'>
	+ <parameter type-id='46a83d9c' name='target'/>
	+ <parameter type-id='9c313c2d' name='bits'/>
	+ <return type-id='9c313c2d'/>
	+ </function-decl>
	+ <function-decl name='atomic_swap_ptr' mangled-name='atomic_swap_ptr' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_swap_ptr'>
	+ <parameter type-id='fe09dd29' name='target'/>
	+ <parameter type-id='eaa32e2f' name='bits'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='atomic_set_long_excl' mangled-name='atomic_set_long_excl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_set_long_excl'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='3502e3ff' name='value'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='atomic_clear_long_excl' mangled-name='atomic_clear_long_excl' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='atomic_clear_long_excl'>
	+ <parameter type-id='64698d33' name='target'/>
	+ <parameter type-id='3502e3ff' name='value'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='membar_enter' mangled-name='membar_enter' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='membar_enter'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='membar_exit' mangled-name='membar_exit' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='membar_exit'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='membar_producer' mangled-name='membar_producer' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='membar_producer'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='membar_consumer' mangled-name='membar_consumer' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='membar_consumer'>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <type-decl name='short int' size-in-bits='16' id='a2185560'/>
	+ <typedef-decl name='int16_t' type-id='a2185560' id='23bd8cb5'/>
	+ <typedef-decl name='int32_t' type-id='95e97e5e' id='3ff5601b'/>
	+ <typedef-decl name='uchar_t' type-id='002ac4a6' id='d8bf0010'/>
	+ <typedef-decl name='uint64_t' type-id='7359adad' id='9c313c2d'/>
	+ <pointer-type-def type-id='b0b3cbf9' size-in-bits='64' id='fe09dd29'/>
	+ <qualified-type-def type-id='48b5725f' volatile='yes' id='b0b3cbf9'/>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='list.c' language='LANG_C89'>
	+ <typedef-decl name='list_t' type-id='e824dae9' id='0899125f'/>
	+ <class-decl name='list' size-in-bits='256' is-struct='yes' visibility='default' id='e824dae9'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='list_size' type-id='b59d7dce' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='list_offset' type-id='b59d7dce' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='128'>
	+ <var-decl name='list_head' type-id='b0b5e45e' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <class-decl name='list_node' size-in-bits='128' is-struct='yes' visibility='default' id='b0b5e45e'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='next' type-id='b03eadb4' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='64'>
	+ <var-decl name='prev' type-id='b03eadb4' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <typedef-decl name='list_node_t' type-id='b0b5e45e' id='b21843b2'/>
	+ <pointer-type-def type-id='b0b5e45e' size-in-bits='64' id='b03eadb4'/>
	+ <pointer-type-def type-id='b21843b2' size-in-bits='64' id='ccc38265'/>
	+ <pointer-type-def type-id='0899125f' size-in-bits='64' id='352ec160'/>
	+ <function-decl name='list_create' mangled-name='list_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_create'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='b59d7dce' name='size'/>
	+ <parameter type-id='b59d7dce' name='offset'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_destroy' mangled-name='list_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_destroy'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_insert_head' mangled-name='list_insert_head' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_insert_head'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_insert_after' mangled-name='list_insert_after' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_insert_after'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <parameter type-id='eaa32e2f' name='nobject'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_insert_tail' mangled-name='list_insert_tail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_insert_tail'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_insert_before' mangled-name='list_insert_before' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_insert_before'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <parameter type-id='eaa32e2f' name='nobject'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_remove' mangled-name='list_remove' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_remove'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_remove_head' mangled-name='list_remove_head' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_remove_head'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_remove_tail' mangled-name='list_remove_tail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_remove_tail'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_head' mangled-name='list_head' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_head'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_tail' mangled-name='list_tail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_tail'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_next' mangled-name='list_next' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_next'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_prev' mangled-name='list_prev' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_prev'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <parameter type-id='eaa32e2f' name='object'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='list_move_tail' mangled-name='list_move_tail' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_move_tail'>
	+ <parameter type-id='352ec160' name='dst'/>
	+ <parameter type-id='352ec160' name='src'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_link_replace' mangled-name='list_link_replace' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_link_replace'>
	+ <parameter type-id='ccc38265' name='lold'/>
	+ <parameter type-id='ccc38265' name='lnew'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_link_init' mangled-name='list_link_init' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_link_init'>
	+ <parameter type-id='ccc38265' name='ln'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='list_link_active' mangled-name='list_link_active' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_link_active'>
	+ <parameter type-id='ccc38265' name='ln'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='list_is_empty' mangled-name='list_is_empty' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='list_is_empty'>
	+ <parameter type-id='352ec160' name='list'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='mkdirp.c' language='LANG_C89'>
	+ <typedef-decl name='mode_t' type-id='e1c52942' id='d50d396c'/>
	+ <typedef-decl name='wchar_t' type-id='95e97e5e' id='928221d2'/>
	+ <qualified-type-def type-id='928221d2' const='yes' id='effb3702'/>
	+ <pointer-type-def type-id='effb3702' size-in-bits='64' id='f077d3f8'/>
	+ <pointer-type-def type-id='928221d2' size-in-bits='64' id='323d93c1'/>
	+ <function-decl name='mkdirp' mangled-name='mkdirp' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='mkdirp'>
	+ <parameter type-id='80f4b756' name='d'/>
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	- <var-decl name='drr_toguid' type-id='type-id-6' visibility='default' filepath='../../include/sys/zfs_ioctl.h' line='237' column='1'/>
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	- <var-decl name='drr_toname' type-id='type-id-2' visibility='default' filepath='../../include/sys/zfs_ioctl.h' line='239' column='1'/>
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	- <parameter type-id='type-id-76' name='program' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1388' column='1'/>
	- <parameter type-id='type-id-6' name='timeout' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1389' column='1'/>
	- <parameter type-id='type-id-6' name='memlimit' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1389' column='1'/>
	- <parameter type-id='type-id-81' name='argnvl' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1389' column='1'/>
	- <parameter type-id='type-id-82' name='outnvl' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1389' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_pool_checkpoint_discard' mangled-name='lzc_pool_checkpoint_discard' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1360' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_pool_checkpoint_discard'>
	- <parameter type-id='type-id-76' name='pool' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1360' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_pool_checkpoint' mangled-name='lzc_pool_checkpoint' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1331' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_pool_checkpoint'>
	- <parameter type-id='type-id-76' name='pool' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1331' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_channel_program' mangled-name='lzc_channel_program' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1300' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_channel_program'>
	- <parameter type-id='type-id-76' name='pool' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1300' column='1'/>
	- <parameter type-id='type-id-76' name='program' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1300' column='1'/>
	- <parameter type-id='type-id-6' name='instrlimit' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1300' column='1'/>
	- <parameter type-id='type-id-6' name='memlimit' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1301' column='1'/>
	- <parameter type-id='type-id-81' name='argnvl' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1301' column='1'/>
	- <parameter type-id='type-id-82' name='outnvl' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1301' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_destroy_bookmarks' mangled-name='lzc_destroy_bookmarks' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1229' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_destroy_bookmarks'>
	- <parameter type-id='type-id-81' name='bmarks' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1229' column='1'/>
	- <parameter type-id='type-id-82' name='errlist' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1229' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_get_bookmark_props' mangled-name='lzc_get_bookmark_props' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1201' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_get_bookmark_props'>
	- <parameter type-id='type-id-76' name='bookmark' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1201' column='1'/>
	- <parameter type-id='type-id-82' name='props' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1201' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_get_bookmarks' mangled-name='lzc_get_bookmarks' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1180' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_get_bookmarks'>
	- <parameter type-id='type-id-76' name='fsname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1180' column='1'/>
	- <parameter type-id='type-id-81' name='props' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1180' column='1'/>
	- <parameter type-id='type-id-82' name='bmarks' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1180' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_bookmark' mangled-name='lzc_bookmark' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1125' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_bookmark'>
	- <parameter type-id='type-id-81' name='bookmarks' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1125' column='1'/>
	- <parameter type-id='type-id-82' name='errlist' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1125' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_rollback_to' mangled-name='lzc_rollback_to' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1095' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_rollback_to'>
	- <parameter type-id='type-id-76' name='fsname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1095' column='1'/>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1095' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_rollback' mangled-name='lzc_rollback' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1070' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_rollback'>
	- <parameter type-id='type-id-76' name='fsname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1070' column='1'/>
	- <parameter type-id='type-id-74' name='snapnamebuf' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1070' column='1'/>
	- <parameter type-id='type-id-5' name='snapnamelen' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1070' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_receive_with_cmdprops' mangled-name='lzc_receive_with_cmdprops' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1047' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive_with_cmdprops'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1047' column='1'/>
	- <parameter type-id='type-id-81' name='props' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1047' column='1'/>
	- <parameter type-id='type-id-81' name='cmdprops' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1048' column='1'/>
	- <parameter type-id='type-id-84' name='wkeydata' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1048' column='1'/>
	- <parameter type-id='type-id-46' name='wkeylen' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1048' column='1'/>
	- <parameter type-id='type-id-76' name='origin' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1048' column='1'/>
	- <parameter type-id='type-id-38' name='force' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1049' column='1'/>
	- <parameter type-id='type-id-38' name='resumable' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1049' column='1'/>
	- <parameter type-id='type-id-38' name='raw' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1049' column='1'/>
	- <parameter type-id='type-id-5' name='input_fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1049' column='1'/>
	- <parameter type-id='type-id-78' name='begin_record' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1050' column='1'/>
	- <parameter type-id='type-id-5' name='cleanup_fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1050' column='1'/>
	- <parameter type-id='type-id-83' name='read_bytes' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1051' column='1'/>
	- <parameter type-id='type-id-83' name='errflags' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1051' column='1'/>
	- <parameter type-id='type-id-83' name='action_handle' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1051' column='1'/>
	- <parameter type-id='type-id-82' name='errors' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1052' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_receive_one' mangled-name='lzc_receive_one' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1028' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive_one'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1028' column='1'/>
	- <parameter type-id='type-id-81' name='props' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1028' column='1'/>
	- <parameter type-id='type-id-76' name='origin' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1029' column='1'/>
	- <parameter type-id='type-id-38' name='force' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1029' column='1'/>
	- <parameter type-id='type-id-38' name='resumable' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1029' column='1'/>
	- <parameter type-id='type-id-38' name='raw' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1029' column='1'/>
	- <parameter type-id='type-id-5' name='input_fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1030' column='1'/>
	- <parameter type-id='type-id-78' name='begin_record' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1030' column='1'/>
	- <parameter type-id='type-id-5' name='cleanup_fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1030' column='1'/>
	- <parameter type-id='type-id-83' name='read_bytes' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1031' column='1'/>
	- <parameter type-id='type-id-83' name='errflags' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1031' column='1'/>
	- <parameter type-id='type-id-83' name='action_handle' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1031' column='1'/>
	- <parameter type-id='type-id-82' name='errors' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1032' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_receive_with_header' mangled-name='lzc_receive_with_header' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='999' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive_with_header'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='999' column='1'/>
	- <parameter type-id='type-id-81' name='props' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='999' column='1'/>
	- <parameter type-id='type-id-76' name='origin' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1000' column='1'/>
	- <parameter type-id='type-id-38' name='force' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1000' column='1'/>
	- <parameter type-id='type-id-38' name='resumable' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1000' column='1'/>
	- <parameter type-id='type-id-38' name='raw' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1000' column='1'/>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1001' column='1'/>
	- <parameter type-id='type-id-78' name='begin_record' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='1001' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_receive_resumable' mangled-name='lzc_receive_resumable' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='980' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive_resumable'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='980' column='1'/>
	- <parameter type-id='type-id-81' name='props' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='980' column='1'/>
	- <parameter type-id='type-id-76' name='origin' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='980' column='1'/>
	- <parameter type-id='type-id-38' name='force' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='981' column='1'/>
	- <parameter type-id='type-id-38' name='raw' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='981' column='1'/>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='981' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_receive' mangled-name='lzc_receive' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='966' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='966' column='1'/>
	- <parameter type-id='type-id-81' name='props' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='966' column='1'/>
	- <parameter type-id='type-id-76' name='origin' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='966' column='1'/>
	- <parameter type-id='type-id-38' name='force' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='967' column='1'/>
	- <parameter type-id='type-id-38' name='raw' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='967' column='1'/>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='967' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_send_space' mangled-name='lzc_send_space' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='749' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_space'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='749' column='1'/>
	- <parameter type-id='type-id-76' name='from' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='749' column='1'/>
	- <parameter type-id='type-id-71' name='flags' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='750' column='1'/>
	- <parameter type-id='type-id-83' name='spacep' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='750' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_send_space_resume_redacted' mangled-name='lzc_send_space_resume_redacted' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='711' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_space_resume_redacted'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='711' column='1'/>
	- <parameter type-id='type-id-76' name='from' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='711' column='1'/>
	- <parameter type-id='type-id-71' name='flags' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='712' column='1'/>
	- <parameter type-id='type-id-6' name='resumeobj' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='712' column='1'/>
	- <parameter type-id='type-id-6' name='resumeoff' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='712' column='1'/>
	- <parameter type-id='type-id-6' name='resume_bytes' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='713' column='1'/>
	- <parameter type-id='type-id-76' name='redactbook' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='713' column='1'/>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='713' column='1'/>
	- <parameter type-id='type-id-83' name='spacep' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='713' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_send_resume_redacted' mangled-name='lzc_send_resume_redacted' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='661' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_resume_redacted'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='661' column='1'/>
	- <parameter type-id='type-id-76' name='from' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='661' column='1'/>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='661' column='1'/>
	- <parameter type-id='type-id-71' name='flags' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='662' column='1'/>
	- <parameter type-id='type-id-6' name='resumeobj' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='662' column='1'/>
	- <parameter type-id='type-id-6' name='resumeoff' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='662' column='1'/>
	- <parameter type-id='type-id-76' name='redactbook' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='663' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='lzc_send_resume' mangled-name='lzc_send_resume' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='641' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_resume'>
	- <parameter type-id='type-id-76' name='snapname' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='641' column='1'/>
	- <parameter type-id='type-id-76' name='from' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='641' column='1'/>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='641' column='1'/>
	- <parameter type-id='type-id-71' name='flags' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='642' column='1'/>
	- <parameter type-id='type-id-6' name='resumeobj' filepath='/home/fedora/zfs/lib/libzfs_core/libzfs_core.c' line='642' column='1'/>
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	+ <function-decl name='lzc_rename' mangled-name='lzc_rename' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_rename'>
	+ <parameter type-id='80f4b756' name='source'/>
	+ <parameter type-id='80f4b756' name='target'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_destroy' mangled-name='lzc_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_destroy'>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_snapshot' mangled-name='lzc_snapshot' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_snapshot'>
	+ <parameter type-id='5ce45b60' name='snaps'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='857bb57e' name='errlist'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_destroy_snaps' mangled-name='lzc_destroy_snaps' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_destroy_snaps'>
	+ <parameter type-id='5ce45b60' name='snaps'/>
	+ <parameter type-id='c19b74c3' name='defer'/>
	+ <parameter type-id='857bb57e' name='errlist'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_snaprange_space' mangled-name='lzc_snaprange_space' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_snaprange_space'>
	+ <parameter type-id='80f4b756' name='firstsnap'/>
	+ <parameter type-id='80f4b756' name='lastsnap'/>
	+ <parameter type-id='5d6479ae' name='usedp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_exists' mangled-name='lzc_exists' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_exists'>
	+ <parameter type-id='80f4b756' name='dataset'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='lzc_sync' mangled-name='lzc_sync' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_sync'>
	+ <parameter type-id='80f4b756' name='pool_name'/>
	+ <parameter type-id='5ce45b60' name='innvl'/>
	+ <parameter type-id='857bb57e' name='outnvl'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_hold' mangled-name='lzc_hold' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_hold'>
	+ <parameter type-id='5ce45b60' name='holds'/>
	+ <parameter type-id='95e97e5e' name='cleanup_fd'/>
	+ <parameter type-id='857bb57e' name='errlist'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_release' mangled-name='lzc_release' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_release'>
	+ <parameter type-id='5ce45b60' name='holds'/>
	+ <parameter type-id='857bb57e' name='errlist'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_get_holds' mangled-name='lzc_get_holds' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_get_holds'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='857bb57e' name='holdsp'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_send_resume_redacted' mangled-name='lzc_send_resume_redacted' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_resume_redacted'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='80f4b756' name='from'/>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <parameter type-id='bfbd3c8e' name='flags'/>
	+ <parameter type-id='9c313c2d' name='resumeobj'/>
	+ <parameter type-id='9c313c2d' name='resumeoff'/>
	+ <parameter type-id='80f4b756' name='redactbook'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_send' mangled-name='lzc_send' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='80f4b756' name='from'/>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <parameter type-id='bfbd3c8e' name='flags'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_send_redacted' mangled-name='lzc_send_redacted' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_redacted'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='80f4b756' name='from'/>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <parameter type-id='bfbd3c8e' name='flags'/>
	+ <parameter type-id='80f4b756' name='redactbook'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_send_resume' mangled-name='lzc_send_resume' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_resume'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='80f4b756' name='from'/>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <parameter type-id='bfbd3c8e' name='flags'/>
	+ <parameter type-id='9c313c2d' name='resumeobj'/>
	+ <parameter type-id='9c313c2d' name='resumeoff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_send_space_resume_redacted' mangled-name='lzc_send_space_resume_redacted' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_space_resume_redacted'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='80f4b756' name='from'/>
	+ <parameter type-id='bfbd3c8e' name='flags'/>
	+ <parameter type-id='9c313c2d' name='resumeobj'/>
	+ <parameter type-id='9c313c2d' name='resumeoff'/>
	+ <parameter type-id='9c313c2d' name='resume_bytes'/>
	+ <parameter type-id='80f4b756' name='redactbook'/>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <parameter type-id='5d6479ae' name='spacep'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_send_space' mangled-name='lzc_send_space' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_send_space'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='80f4b756' name='from'/>
	+ <parameter type-id='bfbd3c8e' name='flags'/>
	+ <parameter type-id='5d6479ae' name='spacep'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_receive' mangled-name='lzc_receive' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='80f4b756' name='origin'/>
	+ <parameter type-id='c19b74c3' name='force'/>
	+ <parameter type-id='c19b74c3' name='raw'/>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_receive_resumable' mangled-name='lzc_receive_resumable' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive_resumable'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='80f4b756' name='origin'/>
	+ <parameter type-id='c19b74c3' name='force'/>
	+ <parameter type-id='c19b74c3' name='raw'/>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_receive_with_header' mangled-name='lzc_receive_with_header' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive_with_header'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='80f4b756' name='origin'/>
	+ <parameter type-id='c19b74c3' name='force'/>
	+ <parameter type-id='c19b74c3' name='resumable'/>
	+ <parameter type-id='c19b74c3' name='raw'/>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <parameter type-id='8341348b' name='begin_record'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_receive_one' mangled-name='lzc_receive_one' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive_one'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='80f4b756' name='origin'/>
	+ <parameter type-id='c19b74c3' name='force'/>
	+ <parameter type-id='c19b74c3' name='resumable'/>
	+ <parameter type-id='c19b74c3' name='raw'/>
	+ <parameter type-id='95e97e5e' name='input_fd'/>
	+ <parameter type-id='8341348b' name='begin_record'/>
	+ <parameter type-id='95e97e5e' name='cleanup_fd'/>
	+ <parameter type-id='5d6479ae' name='read_bytes'/>
	+ <parameter type-id='5d6479ae' name='errflags'/>
	+ <parameter type-id='5d6479ae' name='action_handle'/>
	+ <parameter type-id='857bb57e' name='errors'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_receive_with_cmdprops' mangled-name='lzc_receive_with_cmdprops' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_receive_with_cmdprops'>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='5ce45b60' name='cmdprops'/>
	+ <parameter type-id='ae3e8ca6' name='wkeydata'/>
	+ <parameter type-id='3502e3ff' name='wkeylen'/>
	+ <parameter type-id='80f4b756' name='origin'/>
	+ <parameter type-id='c19b74c3' name='force'/>
	+ <parameter type-id='c19b74c3' name='resumable'/>
	+ <parameter type-id='c19b74c3' name='raw'/>
	+ <parameter type-id='95e97e5e' name='input_fd'/>
	+ <parameter type-id='8341348b' name='begin_record'/>
	+ <parameter type-id='95e97e5e' name='cleanup_fd'/>
	+ <parameter type-id='5d6479ae' name='read_bytes'/>
	+ <parameter type-id='5d6479ae' name='errflags'/>
	+ <parameter type-id='5d6479ae' name='action_handle'/>
	+ <parameter type-id='857bb57e' name='errors'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_rollback' mangled-name='lzc_rollback' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_rollback'>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <parameter type-id='26a90f95' name='snapnamebuf'/>
	+ <parameter type-id='95e97e5e' name='snapnamelen'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_rollback_to' mangled-name='lzc_rollback_to' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_rollback_to'>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <parameter type-id='80f4b756' name='snapname'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_bookmark' mangled-name='lzc_bookmark' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_bookmark'>
	+ <parameter type-id='5ce45b60' name='bookmarks'/>
	+ <parameter type-id='857bb57e' name='errlist'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_get_bookmarks' mangled-name='lzc_get_bookmarks' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_get_bookmarks'>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='857bb57e' name='bmarks'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_get_bookmark_props' mangled-name='lzc_get_bookmark_props' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_get_bookmark_props'>
	+ <parameter type-id='80f4b756' name='bookmark'/>
	+ <parameter type-id='857bb57e' name='props'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_destroy_bookmarks' mangled-name='lzc_destroy_bookmarks' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_destroy_bookmarks'>
	+ <parameter type-id='5ce45b60' name='bmarks'/>
	+ <parameter type-id='857bb57e' name='errlist'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_channel_program' mangled-name='lzc_channel_program' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_channel_program'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='80f4b756' name='program'/>
	+ <parameter type-id='9c313c2d' name='instrlimit'/>
	+ <parameter type-id='9c313c2d' name='memlimit'/>
	+ <parameter type-id='5ce45b60' name='argnvl'/>
	+ <parameter type-id='857bb57e' name='outnvl'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_pool_checkpoint' mangled-name='lzc_pool_checkpoint' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_pool_checkpoint'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_pool_checkpoint_discard' mangled-name='lzc_pool_checkpoint_discard' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_pool_checkpoint_discard'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_channel_program_nosync' mangled-name='lzc_channel_program_nosync' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_channel_program_nosync'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='80f4b756' name='program'/>
	+ <parameter type-id='9c313c2d' name='timeout'/>
	+ <parameter type-id='9c313c2d' name='memlimit'/>
	+ <parameter type-id='5ce45b60' name='argnvl'/>
	+ <parameter type-id='857bb57e' name='outnvl'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_load_key' mangled-name='lzc_load_key' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_load_key'>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <parameter type-id='c19b74c3' name='noop'/>
	+ <parameter type-id='ae3e8ca6' name='wkeydata'/>
	+ <parameter type-id='3502e3ff' name='wkeylen'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_unload_key' mangled-name='lzc_unload_key' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_unload_key'>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_change_key' mangled-name='lzc_change_key' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_change_key'>
	+ <parameter type-id='80f4b756' name='fsname'/>
	+ <parameter type-id='9c313c2d' name='crypt_cmd'/>
	+ <parameter type-id='5ce45b60' name='props'/>
	+ <parameter type-id='ae3e8ca6' name='wkeydata'/>
	+ <parameter type-id='3502e3ff' name='wkeylen'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_reopen' mangled-name='lzc_reopen' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_reopen'>
	+ <parameter type-id='80f4b756' name='pool_name'/>
	+ <parameter type-id='c19b74c3' name='scrub_restart'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_initialize' mangled-name='lzc_initialize' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_initialize'>
	+ <parameter type-id='80f4b756' name='poolname'/>
	+ <parameter type-id='7063e1ab' name='cmd_type'/>
	+ <parameter type-id='5ce45b60' name='vdevs'/>
	+ <parameter type-id='857bb57e' name='errlist'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_trim' mangled-name='lzc_trim' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_trim'>
	+ <parameter type-id='80f4b756' name='poolname'/>
	+ <parameter type-id='b1146b8d' name='cmd_type'/>
	+ <parameter type-id='9c313c2d' name='rate'/>
	+ <parameter type-id='c19b74c3' name='secure'/>
	+ <parameter type-id='5ce45b60' name='vdevs'/>
	+ <parameter type-id='857bb57e' name='errlist'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_redact' mangled-name='lzc_redact' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_redact'>
	+ <parameter type-id='80f4b756' name='snapshot'/>
	+ <parameter type-id='80f4b756' name='bookname'/>
	+ <parameter type-id='5ce45b60' name='snapnv'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_wait' mangled-name='lzc_wait' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_wait'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='73446457' name='activity'/>
	+ <parameter type-id='37e3bd22' name='waited'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_wait_tag' mangled-name='lzc_wait_tag' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_wait_tag'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='73446457' name='activity'/>
	+ <parameter type-id='9c313c2d' name='tag'/>
	+ <parameter type-id='37e3bd22' name='waited'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_wait_fs' mangled-name='lzc_wait_fs' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_wait_fs'>
	+ <parameter type-id='80f4b756' name='fs'/>
	+ <parameter type-id='3024501a' name='activity'/>
	+ <parameter type-id='37e3bd22' name='waited'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_set_bootenv' mangled-name='lzc_set_bootenv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_set_bootenv'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='22cce67b' name='env'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzc_get_bootenv' mangled-name='lzc_get_bootenv' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzc_get_bootenv'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='857bb57e' name='outnvl'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libspl_assertf' mangled-name='libspl_assertf' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='libspl_assertf'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='strlcpy' mangled-name='strlcpy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='strlcpy'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_pack' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='78c01427'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='malloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_pack_free' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='free' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
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	- <var-decl name='zc_zoneid' type-id='type-id-6' visibility='default' filepath='../../include/sys/zfs_ioctl.h' line='517' column='1'/>
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	- <class-decl name='zfs_share' size-in-bits='256' is-struct='yes' visibility='default' filepath='../../include/sys/zfs_ioctl.h' line='452' column='1' id='type-id-159'>
	+ <typedef-decl name='ushort_t' type-id='8efea9e5' id='d908a348'/>
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	+ <pointer-type-def type-id='640b33ca' size-in-bits='64' id='b32bae08'/>
	+ <function-decl name='zfs_strip_partition' mangled-name='zfs_strip_partition' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_strip_partition'>
	+ <parameter type-id='26a90f95' name='path'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='zfs_strip_path' mangled-name='zfs_strip_path' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_strip_path'>
	+ <parameter type-id='26a90f95' name='path'/>
	+ <return type-id='26a90f95'/>
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	+ <parameter type-id='80f4b756' name='dev_name'/>
	+ <return type-id='26a90f95'/>
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	+ <parameter type-id='80f4b756' name='dev_name'/>
	+ <return type-id='c19b74c3'/>
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	+ <parameter type-id='80f4b756' name='dev_name'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
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	+ <parameter type-id='80f4b756' name='dev_name'/>
	+ <return type-id='26a90f95'/>
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	+ <parameter type-id='80f4b756' name='path'/>
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	+ <class-decl name='blkid_struct_dev' is-struct='yes' visibility='default' is-declaration-only='yes' id='86223623'/>
	+ <class-decl name='blkid_struct_dev_iterate' is-struct='yes' visibility='default' is-declaration-only='yes' id='d88420d6'/>
	+ <class-decl name='udev_list_entry' is-struct='yes' visibility='default' is-declaration-only='yes' id='e7dbdca3'/>
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	+ <typedef-decl name='blkid_dev' type-id='8433f053' id='f47b023a'/>
	+ <typedef-decl name='clockid_t' type-id='08f9a87a' id='a1c3b834'/>
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	+ <pointer-type-def type-id='b0b3cbf9' size-in-bits='64' id='fe09dd29'/>
	+ <function-decl name='slice_cache_compare' mangled-name='slice_cache_compare' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='slice_cache_compare'>
	+ <parameter type-id='eaa32e2f' name='arg1'/>
	+ <parameter type-id='eaa32e2f' name='arg2'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zutil_alloc' mangled-name='zutil_alloc' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zutil_alloc'>
	+ <parameter type-id='5507783b' name='hdl'/>
	+ <parameter type-id='b59d7dce' name='size'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='zutil_strdup' mangled-name='zutil_strdup' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zutil_strdup'>
	+ <parameter type-id='5507783b' name='hdl'/>
	+ <parameter type-id='80f4b756' name='str'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='zpool_read_label' mangled-name='zpool_read_label' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_read_label'>
	+ <parameter type-id='95e97e5e' name='fd'/>
	+ <parameter type-id='857bb57e' name='config'/>
	+ <parameter type-id='7292109c' name='num_labels'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='label_paths' mangled-name='label_paths' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='label_paths'>
	+ <parameter type-id='5507783b' name='hdl'/>
	+ <parameter type-id='5ce45b60' name='label'/>
	+ <parameter type-id='9b23c9ad' name='path'/>
	+ <parameter type-id='9b23c9ad' name='devid'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='zpool_search_import' mangled-name='zpool_search_import' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_search_import'>
	+ <parameter type-id='eaa32e2f' name='hdl'/>
	+ <parameter type-id='07ee4a58' name='import'/>
	+ <parameter type-id='f095e320' name='pco'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='zpool_find_config' mangled-name='zpool_find_config' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_find_config'>
	+ <parameter type-id='eaa32e2f' name='hdl'/>
	+ <parameter type-id='80f4b756' name='target'/>
	+ <parameter type-id='857bb57e' name='configp'/>
	+ <parameter type-id='07ee4a58' name='args'/>
	+ <parameter type-id='f095e320' name='pco'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='vsnprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b7f2d5e6'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='exit' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_nvlist_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='75be733c'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='update_vdev_config_dev_strs' mangled-name='update_vdev_config_dev_strs' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='update_vdev_config_dev_strs'>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='strncmp' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='calloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='asprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9b23c9ad'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='avl_find' mangled-name='avl_find' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='avl_find'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='32adbf30'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='avl_insert' mangled-name='avl_insert' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='avl_insert'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='fba6cb51'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='realpath' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='opendir' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='f09217ba'/>
	+ </function-decl>
	+ <function-decl name='readdir64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='f09217ba'/>
	+ <return type-id='07b96073'/>
	+ </function-decl>
	+ <function-decl name='closedir' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='f09217ba'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='strerror' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='dcgettext' visibility='default' binding='global' size-in-bits='64'>
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	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='dirname' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='nvlist_alloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='857bb57e'/>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9c313c2d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_dup' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='857bb57e'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_remove' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='8d0687d2'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint64_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='892b4acc'/>
	+ <parameter type-id='4dd26a40'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint64_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5d6479ae'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_nvlist_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='857bb57e'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='sysconf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='bd54fe1a'/>
	+ </function-decl>
	+ <function-decl name='tpool_create' mangled-name='tpool_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='tpool_create'>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='7347a39e'/>
	+ <return type-id='9cf59a50'/>
	+ </function-decl>
	+ <function-decl name='avl_first' mangled-name='avl_first' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='avl_first'>
	+ <parameter type-id='a3681dea'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='tpool_dispatch' mangled-name='tpool_dispatch' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='tpool_dispatch'>
	+ <parameter type-id='9cf59a50'/>
	+ <parameter type-id='b7f9d8e6'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='avl_walk' mangled-name='avl_walk' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='avl_walk'>
	+ <parameter type-id='716943c7'/>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='tpool_wait' mangled-name='tpool_wait' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='tpool_wait'>
	+ <parameter type-id='9cf59a50'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='tpool_destroy' mangled-name='tpool_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='tpool_destroy'>
	+ <parameter type-id='9cf59a50'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='avl_destroy_nodes' mangled-name='avl_destroy_nodes' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='avl_destroy_nodes'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='63e171df'/>
	+ <return type-id='eaa32e2f'/>
	+ </function-decl>
	+ <function-decl name='avl_destroy' mangled-name='avl_destroy' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='avl_destroy'>
	+ <parameter type-id='a3681dea'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='__fxstat64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
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	+ <parameter type-id='62f7a03d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='ioctl' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='95e97e5e'/>
	+ <parameter type-id='7359adad'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='pread64' visibility='default' binding='global' size-in-bits='64'>
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	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='724e4de6'/>
	+ <return type-id='79a0948f'/>
	+ </function-decl>
	+ <function-decl name='spl_pagesize' mangled-name='spl_pagesize' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='spl_pagesize'>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='posix_memalign' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='63e171df'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='avl_create' mangled-name='avl_create' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='avl_create'>
	+ <parameter type-id='a3681dea'/>
	+ <parameter type-id='585e1de9'/>
	+ <parameter type-id='b59d7dce'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_lookup_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='pthread_mutex_init' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='18c91f9e'/>
	+ <parameter type-id='c2afbd7e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='pthread_mutex_destroy' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='18c91f9e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvpair_value_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3fa542f0'/>
	+ <return type-id='5ce45b60'/>
	+ </function-decl>
	+ <function-decl name='__xpg_basename' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='26a90f95'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ <function-decl name='zpool_find_import_blkid' mangled-name='zpool_find_import_blkid' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_find_import_blkid'>
	+ <parameter type-id='5507783b'/>
	+ <parameter type-id='18c91f9e'/>
	+ <parameter type-id='fce6d540'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_empty' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='geteuid' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='cc5fcceb'/>
	+ </function-decl>
	+ <function-decl name='nvpair_value_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='3fa542f0'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='strtoull' visibility='default' binding='global' size-in-bits='64'>
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	+ <function-type size-in-bits='64' id='c5c76c9c'>
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	+ <return type-id='48b5725f'/>
	+ </function-type>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='zutil_nicenum.c' language='LANG_C89'>
	+ <type-decl name='double' size-in-bits='64' id='a0eb0f08'/>
	+ <type-decl name='long double' size-in-bits='128' id='e095c704'/>
	+ <enum-decl name='zfs_nicenum_format' id='29cf1969'>
	+ <underlying-type type-id='9cac1fee'/>
	+ <enumerator name='ZFS_NICENUM_1024' value='0'/>
	+ <enumerator name='ZFS_NICENUM_BYTES' value='1'/>
	+ <enumerator name='ZFS_NICENUM_TIME' value='2'/>
	+ <enumerator name='ZFS_NICENUM_RAW' value='3'/>
	+ <enumerator name='ZFS_NICENUM_RAWTIME' value='4'/>
	+ </enum-decl>
	+ <qualified-type-def type-id='8efea9e5' const='yes' id='3beb2af4'/>
	+ <pointer-type-def type-id='3beb2af4' size-in-bits='64' id='31347b7a'/>
	+ <pointer-type-def type-id='31347b7a' size-in-bits='64' id='c59e1ef0'/>
	+ <function-decl name='zfs_isnumber' mangled-name='zfs_isnumber' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_isnumber'>
	+ <parameter type-id='80f4b756' name='str'/>
	+ <return type-id='c19b74c3'/>
	+ </function-decl>
	+ <function-decl name='zfs_nicenum_format' mangled-name='zfs_nicenum_format' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_nicenum_format'>
	+ <parameter type-id='9c313c2d' name='num'/>
	+ <parameter type-id='26a90f95' name='buf'/>
	+ <parameter type-id='b59d7dce' name='buflen'/>
	+ <parameter type-id='29cf1969' name='format'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_nicenum' mangled-name='zfs_nicenum' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_nicenum'>
	+ <parameter type-id='9c313c2d' name='num'/>
	+ <parameter type-id='26a90f95' name='buf'/>
	+ <parameter type-id='b59d7dce' name='buflen'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_nicetime' mangled-name='zfs_nicetime' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_nicetime'>
	+ <parameter type-id='9c313c2d' name='num'/>
	+ <parameter type-id='26a90f95' name='buf'/>
	+ <parameter type-id='b59d7dce' name='buflen'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_niceraw' mangled-name='zfs_niceraw' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_niceraw'>
	+ <parameter type-id='9c313c2d' name='num'/>
	+ <parameter type-id='26a90f95' name='buf'/>
	+ <parameter type-id='b59d7dce' name='buflen'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zfs_nicebytes' mangled-name='zfs_nicebytes' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_nicebytes'>
	+ <parameter type-id='9c313c2d' name='num'/>
	+ <parameter type-id='26a90f95' name='buf'/>
	+ <parameter type-id='b59d7dce' name='buflen'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='__ctype_b_loc' visibility='default' binding='global' size-in-bits='64'>
	+ <return type-id='c59e1ef0'/>
	+ </function-decl>
	+ <function-decl name='powl' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='e095c704'/>
	+ <parameter type-id='e095c704'/>
	+ <return type-id='e095c704'/>
	+ </function-decl>
	+ <function-decl name='floor' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='a0eb0f08'/>
	+ <return type-id='a0eb0f08'/>
	+ </function-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='zutil_pool.c' language='LANG_C89'>
	+ <array-type-def dimensions='1' type-id='853fd5dc' size-in-bits='32768' id='b505fc2f'>
	+ <subrange length='64' type-id='4c87fef4' id='b10be967'/>
	+ </array-type-def>
	+ <typedef-decl name='ddt_stat_t' type-id='65242dfe' id='853fd5dc'/>
	+ <class-decl name='ddt_stat' size-in-bits='512' is-struct='yes' visibility='default' id='65242dfe'>
	<data-member access='public' layout-offset-in-bits='0'>
	- <var-decl name='p_start' type-id='type-id-254' visibility='default' filepath='../../include/sys/efi_partition.h' line='302' column='1'/>
	+ <var-decl name='dds_blocks' type-id='9c313c2d' visibility='default'/>
	</data-member>
	<data-member access='public' layout-offset-in-bits='64'>
	- <var-decl name='p_size' type-id='type-id-254' visibility='default' filepath='../../include/sys/efi_partition.h' line='303' column='1'/>
	+ <var-decl name='dds_lsize' type-id='9c313c2d' visibility='default'/>
	</data-member>
	<data-member access='public' layout-offset-in-bits='128'>
	- <var-decl name='p_guid' type-id='type-id-255' visibility='default' filepath='../../include/sys/efi_partition.h' line='304' column='1'/>
	+ <var-decl name='dds_psize' type-id='9c313c2d' visibility='default'/>
	+ </data-member>
	+ <data-member access='public' layout-offset-in-bits='192'>
	+ <var-decl name='dds_dsize' type-id='9c313c2d' visibility='default'/>
	</data-member>
	<data-member access='public' layout-offset-in-bits='256'>
	- <var-decl name='p_tag' type-id='type-id-257' visibility='default' filepath='../../include/sys/efi_partition.h' line='305' column='1'/>
	+ <var-decl name='dds_ref_blocks' type-id='9c313c2d' visibility='default'/>
	</data-member>
	- <data-member access='public' layout-offset-in-bits='272'>
	- <var-decl name='p_flag' type-id='type-id-257' visibility='default' filepath='../../include/sys/efi_partition.h' line='306' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='320'>
	+ <var-decl name='dds_ref_lsize' type-id='9c313c2d' visibility='default'/>
	</data-member>
	- <data-member access='public' layout-offset-in-bits='288'>
	- <var-decl name='p_name' type-id='type-id-243' visibility='default' filepath='../../include/sys/efi_partition.h' line='307' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='384'>
	+ <var-decl name='dds_ref_psize' type-id='9c313c2d' visibility='default'/>
	</data-member>
	- <data-member access='public' layout-offset-in-bits='576'>
	- <var-decl name='p_uguid' type-id='type-id-255' visibility='default' filepath='../../include/sys/efi_partition.h' line='308' column='1'/>
	+ <data-member access='public' layout-offset-in-bits='448'>
	+ <var-decl name='dds_ref_dsize' type-id='9c313c2d' visibility='default'/>
	</data-member>
	- <data-member access='public' layout-offset-in-bits='704'>
	- <var-decl name='p_resv' type-id='type-id-250' visibility='default' filepath='../../include/sys/efi_partition.h' line='309' column='1'/>
	- </data-member>
	- </class-decl>
	- <typedef-decl name='ushort_t' type-id='type-id-206' filepath='../../lib/libspl/include/sys/stdtypes.h' line='32' column='1' id='type-id-257'/>
	- <pointer-type-def type-id='type-id-253' size-in-bits='64' id='type-id-258'/>
	- <pointer-type-def type-id='type-id-258' size-in-bits='64' id='type-id-259'/>
	- <var-decl name='default_vtoc_map' type-id='type-id-246' mangled-name='default_vtoc_map' visibility='default' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='146' column='1' elf-symbol-id='default_vtoc_map'/>
	- <var-decl name='efi_debug' type-id='type-id-5' mangled-name='efi_debug' visibility='default' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='177' column='1' elf-symbol-id='efi_debug'/>
	- <function-decl name='efi_auto_sense' mangled-name='efi_auto_sense' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1707' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_auto_sense'>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1707' column='1'/>
	- <parameter type-id='type-id-259' name='vtoc' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1707' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='efi_err_check' mangled-name='efi_err_check' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1612' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_err_check'>
	- <parameter type-id='type-id-258' name='vtoc' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1612' column='1'/>
	- <return type-id='type-id-27'/>
	- </function-decl>
	- <function-decl name='efi_type' mangled-name='efi_type' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1590' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_type'>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1590' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='efi_free' mangled-name='efi_free' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1579' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_free'>
	- <parameter type-id='type-id-258' name='ptr' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1579' column='1'/>
	- <return type-id='type-id-27'/>
	- </function-decl>
	- <function-decl name='efi_write' mangled-name='efi_write' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1376' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_write'>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1376' column='1'/>
	- <parameter type-id='type-id-258' name='vtoc' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1376' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='efi_use_whole_disk' mangled-name='efi_use_whole_disk' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1160' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_use_whole_disk'>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='1160' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='efi_rescan' mangled-name='efi_rescan' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='607' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_rescan'>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='607' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='efi_alloc_and_read' mangled-name='efi_alloc_and_read' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='446' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_alloc_and_read'>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='446' column='1'/>
	- <parameter type-id='type-id-259' name='vtoc' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='446' column='1'/>
	- <return type-id='type-id-5'/>
	- </function-decl>
	- <function-decl name='efi_alloc_and_init' mangled-name='efi_alloc_and_init' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='376' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='efi_alloc_and_init'>
	- <parameter type-id='type-id-5' name='fd' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='376' column='1'/>
	- <parameter type-id='type-id-31' name='nparts' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='376' column='1'/>
	- <parameter type-id='type-id-259' name='vtoc' filepath='/home/fedora/zfs/lib/libefi/rdwr_efi.c' line='376' column='1'/>
	- <return type-id='type-id-5'/>
	+ </class-decl>
	+ <typedef-decl name='ddt_histogram_t' type-id='bc2b3086' id='2d7fe832'/>
	+ <class-decl name='ddt_histogram' size-in-bits='32768' is-struct='yes' visibility='default' id='bc2b3086'>
	+ <data-member access='public' layout-offset-in-bits='0'>
	+ <var-decl name='ddh_stat' type-id='b505fc2f' visibility='default'/>
	+ </data-member>
	+ </class-decl>
	+ <qualified-type-def type-id='2d7fe832' const='yes' id='ec92d602'/>
	+ <pointer-type-def type-id='ec92d602' size-in-bits='64' id='932720f8'/>
	+ <qualified-type-def type-id='853fd5dc' const='yes' id='764c298c'/>
	+ <pointer-type-def type-id='764c298c' size-in-bits='64' id='dfe59052'/>
	+ <function-decl name='zpool_dump_ddt' mangled-name='zpool_dump_ddt' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_dump_ddt'>
	+ <parameter type-id='dfe59052' name='dds_total'/>
	+ <parameter type-id='932720f8' name='ddh'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_history_unpack' mangled-name='zpool_history_unpack' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_history_unpack'>
	+ <parameter type-id='26a90f95' name='buf'/>
	+ <parameter type-id='9c313c2d' name='bytes_read'/>
	+ <parameter type-id='5d6479ae' name='leftover'/>
	+ <parameter type-id='75be733c' name='records'/>
	+ <parameter type-id='4dd26a40' name='numrecords'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='printf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='realloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <parameter type-id='b59d7dce'/>
	+ <return type-id='eaa32e2f'/>
	</function-decl>
	</abi-instr>
	</abi-corpus>
	diff --git a/sys/contrib/openzfs/lib/libzfsbootenv/libzfsbootenv.abi b/sys/contrib/openzfs/lib/libzfsbootenv/libzfsbootenv.abi
	index 8ef242d2f5ac..805223708ec7 100644
	--- a/sys/contrib/openzfs/lib/libzfsbootenv/libzfsbootenv.abi
	+++ b/sys/contrib/openzfs/lib/libzfsbootenv/libzfsbootenv.abi
	@@ -1,212 +1,560 @@
	-<abi-corpus path='libzfsbootenv.so' architecture='elf-amd-x86_64' soname='libzfsbootenv.so.1'>
	+<abi-corpus architecture='elf-amd-x86_64' soname='libzfsbootenv.so.1'>
	<elf-needed>
	<dependency name='libzfs.so.4'/>
	<dependency name='libzfs_core.so.3'/>
	<dependency name='libuuid.so.1'/>
	+ <dependency name='librt.so.1'/>
	<dependency name='libblkid.so.1'/>
	<dependency name='libudev.so.1'/>
	<dependency name='libuutil.so.3'/>
	<dependency name='libm.so.6'/>
	- <dependency name='libcrypto.so.1.1'/>
	+ <dependency name='libcrypto.so.10'/>
	<dependency name='libz.so.1'/>
	<dependency name='libnvpair.so.3'/>
	- <dependency name='libtirpc.so.3'/>
	<dependency name='libpthread.so.0'/>
	<dependency name='libc.so.6'/>
	</elf-needed>
	<elf-function-symbols>
	+ <elf-symbol name='_fini' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	+ <elf-symbol name='_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzbe_add_pair' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzbe_bootenv_print' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzbe_get_boot_device' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzbe_nvlist_free' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzbe_nvlist_get' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzbe_nvlist_set' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzbe_remove_pair' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	<elf-symbol name='lzbe_set_boot_device' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
	</elf-function-symbols>
	- <abi-instr version='1.0' address-size='64' path='lzbe_device.c' comp-dir-path='/home/fedora/zfs/lib/libzfsbootenv' language='LANG_C99'>
	- <type-decl name='char' size-in-bits='8' id='type-id-1'/>
	- <type-decl name='int' size-in-bits='32' id='type-id-2'/>
	- <type-decl name='unnamed-enum-underlying-type' is-anonymous='yes' size-in-bits='32' alignment-in-bits='32' id='type-id-3'/>
	- <typedef-decl name='lzbe_flags_t' type-id='type-id-4' filepath='../../include/libzfsbootenv.h' line='26' column='1' id='type-id-5'/>
	- <enum-decl name='lzbe_flags' filepath='../../include/libzfsbootenv.h' line='23' column='1' id='type-id-4'>
	- <underlying-type type-id='type-id-3'/>
	+ <abi-instr version='1.0' address-size='64' path='lzbe_device.c' language='LANG_C89'>
	+ <type-decl name='char' size-in-bits='8' id='a84c031d'/>
	+ <array-type-def dimensions='1' type-id='a84c031d' size-in-bits='8' id='89feb1ec'>
	+ <subrange length='1' type-id='4c87fef4' id='52f813b4'/>
	+ </array-type-def>
	+ <array-type-def dimensions='1' type-id='a84c031d' size-in-bits='160' id='664ac0b7'>
	+ <subrange length='20' type-id='4c87fef4' id='fdca39cf'/>
	+ </array-type-def>
	+ <class-decl name='libzfs_handle' is-struct='yes' visibility='default' is-declaration-only='yes' id='c8a9d9d8'/>
	+ <class-decl name='zpool_handle' is-struct='yes' visibility='default' is-declaration-only='yes' id='67002a8a'/>
	+ <type-decl name='int' size-in-bits='32' id='95e97e5e'/>
	+ <type-decl name='long int' size-in-bits='64' id='bd54fe1a'/>
	+ <type-decl name='signed char' size-in-bits='8' id='28577a57'/>
	+ <type-decl name='sizetype' size-in-bits='64' id='4c87fef4'/>
	+ <type-decl name='unnamed-enum-underlying-type-32' is-anonymous='yes' size-in-bits='32' alignment-in-bits='32' id='9cac1fee'/>
	+ <type-decl name='unsigned int' size-in-bits='32' id='f0981eeb'/>
	+ <type-decl name='unsigned long int' size-in-bits='64' id='7359adad'/>
	+ <type-decl name='unsigned short int' size-in-bits='16' id='8efea9e5'/>
	+ <type-decl name='variadic parameter type' id='2c1145c5'/>
	+ <type-decl name='void' id='48b5725f'/>
	+ <typedef-decl name='lzbe_flags_t' type-id='2b77720b' id='a1936f04'/>
	+ <enum-decl name='lzbe_flags' id='2b77720b'>
	+ <underlying-type type-id='9cac1fee'/>
	<enumerator name='lzbe_add' value='0'/>
	<enumerator name='lzbe_replace' value='1'/>
	</enum-decl>
	- <pointer-type-def type-id='type-id-1' size-in-bits='64' id='type-id-6'/>
	- <pointer-type-def type-id='type-id-6' size-in-bits='64' id='type-id-7'/>
	- <qualified-type-def type-id='type-id-1' const='yes' id='type-id-8'/>
	- <pointer-type-def type-id='type-id-8' size-in-bits='64' id='type-id-9'/>
	- <function-decl name='lzbe_get_boot_device' mangled-name='lzbe_get_boot_device' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_device.c' line='114' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_get_boot_device'>
	- <parameter type-id='type-id-9' name='pool' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_device.c' line='114' column='1'/>
	- <parameter type-id='type-id-7' name='device' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_device.c' line='114' column='1'/>
	- <return type-id='type-id-2'/>
	- </function-decl>
	- <function-decl name='lzbe_set_boot_device' mangled-name='lzbe_set_boot_device' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_device.c' line='28' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_set_boot_device'>
	- <parameter type-id='type-id-9' name='pool' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_device.c' line='28' column='1'/>
	- <parameter type-id='type-id-5' name='flag' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_device.c' line='28' column='1'/>
	- <parameter type-id='type-id-9' name='device' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_device.c' line='28' column='1'/>
	- <return type-id='type-id-2'/>
	- </function-decl>
	- </abi-instr>
	- <abi-instr version='1.0' address-size='64' path='lzbe_pair.c' comp-dir-path='/home/fedora/zfs/lib/libzfsbootenv' language='LANG_C99'>
	- <type-decl name='unsigned long int' size-in-bits='64' id='type-id-10'/>
	- <type-decl name='void' id='type-id-11'/>
	- <typedef-decl name='size_t' type-id='type-id-10' filepath='/usr/lib/gcc/x86_64-redhat-linux/10/include/stddef.h' line='209' column='1' id='type-id-12'/>
	- <pointer-type-def type-id='type-id-11' size-in-bits='64' id='type-id-13'/>
	- <pointer-type-def type-id='type-id-13' size-in-bits='64' id='type-id-14'/>
	- <function-decl name='lzbe_remove_pair' mangled-name='lzbe_remove_pair' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_pair.c' line='343' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_remove_pair'>
	- <parameter type-id='type-id-13' name='ptr' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_pair.c' line='343' column='1'/>
	- <parameter type-id='type-id-9' name='key' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_pair.c' line='343' column='1'/>
	- <return type-id='type-id-2'/>
	- </function-decl>
	- <function-decl name='lzbe_add_pair' mangled-name='lzbe_add_pair' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_pair.c' line='182' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_add_pair'>
	- <parameter type-id='type-id-13' name='ptr' filepath='/home/fedora/zfs/lib/libzfsbootenv/lzbe_pair.c' line='182' column='1'/>
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	+ <function-decl name='zpool_set_bootenv' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='4c81de99'/>
	+ <parameter type-id='22cce67b'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_free' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_close' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='4c81de99'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='libzfs_fini' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='b0382bb3'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='asprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='9b23c9ad'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_add_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='free' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='eaa32e2f'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='zpool_get_bootenv' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='4c81de99'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_uint64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5d6479ae'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='libzfs_error_description' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='b0382bb3'/>
	+ <return type-id='80f4b756'/>
	+ </function-decl>
	+ <function-decl name='fprintf' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter is-variadic='yes'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='fnvlist_remove' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='strlen' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='b59d7dce'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9b23c9ad'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_free' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='__strdup' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='26a90f95'/>
	+ </function-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='lzbe_pair.c' language='LANG_C89'>
	+ <type-decl name='short int' size-in-bits='16' id='a2185560'/>
	+ <type-decl name='unsigned char' size-in-bits='8' id='002ac4a6'/>
	+ <typedef-decl name='uint_t' type-id='f0981eeb' id='3502e3ff'/>
	+ <typedef-decl name='uint8_t' type-id='002ac4a6' id='b96825af'/>
	+ <typedef-decl name='int8_t' type-id='28577a57' id='ee31ee44'/>
	+ <typedef-decl name='int64_t' type-id='bd54fe1a' id='9da381c4'/>
	+ <typedef-decl name='uint16_t' type-id='8efea9e5' id='149c6638'/>
	+ <typedef-decl name='int16_t' type-id='a2185560' id='23bd8cb5'/>
	+ <typedef-decl name='uchar_t' type-id='002ac4a6' id='d8bf0010'/>
	+ <pointer-type-def type-id='c19b74c3' size-in-bits='64' id='37e3bd22'/>
	+ <qualified-type-def type-id='26a90f95' const='yes' id='57de658a'/>
	+ <pointer-type-def type-id='57de658a' size-in-bits='64' id='f319fae0'/>
	+ <pointer-type-def type-id='23bd8cb5' size-in-bits='64' id='f76f73d0'/>
	+ <pointer-type-def type-id='3ff5601b' size-in-bits='64' id='4aafb922'/>
	+ <pointer-type-def type-id='9da381c4' size-in-bits='64' id='cb785ebf'/>
	+ <pointer-type-def type-id='ee31ee44' size-in-bits='64' id='256d5229'/>
	+ <pointer-type-def type-id='d8bf0010' size-in-bits='64' id='45b65157'/>
	+ <pointer-type-def type-id='149c6638' size-in-bits='64' id='8a121f49'/>
	+ <pointer-type-def type-id='8f92235e' size-in-bits='64' id='90421557'/>
	+ <pointer-type-def type-id='b96825af' size-in-bits='64' id='ae3e8ca6'/>
	+ <pointer-type-def type-id='eaa32e2f' size-in-bits='64' id='63e171df'/>
	+ <function-decl name='lzbe_nvlist_get' mangled-name='lzbe_nvlist_get' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_nvlist_get'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='80f4b756' name='key'/>
	+ <parameter type-id='63e171df' name='ptr'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzbe_nvlist_set' mangled-name='lzbe_nvlist_set' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_nvlist_set'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='80f4b756' name='key'/>
	+ <parameter type-id='eaa32e2f' name='ptr'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzbe_nvlist_free' mangled-name='lzbe_nvlist_free' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_nvlist_free'>
	+ <parameter type-id='eaa32e2f' name='ptr'/>
	+ <return type-id='48b5725f'/>
	+ </function-decl>
	+ <function-decl name='lzbe_add_pair' mangled-name='lzbe_add_pair' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_add_pair'>
	+ <parameter type-id='eaa32e2f' name='ptr'/>
	+ <parameter type-id='80f4b756' name='key'/>
	+ <parameter type-id='80f4b756' name='type'/>
	+ <parameter type-id='eaa32e2f' name='value'/>
	+ <parameter type-id='b59d7dce' name='size'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='lzbe_remove_pair' mangled-name='lzbe_remove_pair' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_remove_pair'>
	+ <parameter type-id='eaa32e2f' name='ptr'/>
	+ <parameter type-id='80f4b756' name='key'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_lookup_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='857bb57e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_dup' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='857bb57e'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_alloc' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='857bb57e'/>
	+ <parameter type-id='3502e3ff'/>
	+ <parameter type-id='95e97e5e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_nvlist' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint8_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='ae3e8ca6'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int8_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='256d5229'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_boolean_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='37e3bd22'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint8' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='b96825af'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int8' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='ee31ee44'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_boolean_value' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='c19b74c3'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_nvlist_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='857bb57e'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_string_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='f319fae0'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint64_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='5d6479ae'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int64_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='cb785ebf'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint32_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='90421557'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int32_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='4aafb922'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint16_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='8a121f49'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int16_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='f76f73d0'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_byte_array' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='45b65157'/>
	+ <parameter type-id='3502e3ff'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_string' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9c313c2d'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int64' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='9da381c4'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint32' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='8f92235e'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int32' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='3ff5601b'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_uint16' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='149c6638'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_int16' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='23bd8cb5'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_add_byte' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <parameter type-id='d8bf0010'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_remove_all' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='5ce45b60'/>
	+ <parameter type-id='80f4b756'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ </abi-instr>
	+ <abi-instr version='1.0' address-size='64' path='lzbe_util.c' language='LANG_C89'>
	+ <function-decl name='lzbe_bootenv_print' mangled-name='lzbe_bootenv_print' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='lzbe_bootenv_print'>
	+ <parameter type-id='80f4b756' name='pool'/>
	+ <parameter type-id='80f4b756' name='nvlist'/>
	+ <parameter type-id='822cd80b' name='of'/>
	+ <return type-id='95e97e5e'/>
	+ </function-decl>
	+ <function-decl name='nvlist_print' visibility='default' binding='global' size-in-bits='64'>
	+ <parameter type-id='822cd80b'/>
	+ <parameter type-id='5ce45b60'/>
	+ <return type-id='48b5725f'/>
	</function-decl>
	</abi-instr>
	</abi-corpus>
	diff --git a/sys/contrib/openzfs/lib/libzpool/kernel.c b/sys/contrib/openzfs/lib/libzpool/kernel.c
	index 09812decefcf..5f4740261f98 100644
	--- a/sys/contrib/openzfs/lib/libzpool/kernel.c
	+++ b/sys/contrib/openzfs/lib/libzpool/kernel.c
	@@ -1,1387 +1,1385 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	*/

	#include <assert.h>
	#include <fcntl.h>
	#include <libgen.h>
	#include <poll.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/crypto/icp.h>
	#include <sys/processor.h>
	#include <sys/rrwlock.h>
	#include <sys/spa.h>
	#include <sys/stat.h>
	#include <sys/systeminfo.h>
	#include <sys/time.h>
	#include <sys/utsname.h>
	#include <sys/zfs_context.h>
	#include <sys/zfs_onexit.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/zstd/zstd.h>
	#include <sys/zvol.h>
	#include <zfs_fletcher.h>
	#include <zlib.h>

	/*
	* Emulation of kernel services in userland.
	*/

	uint64_t physmem;
	char hw_serial[HW_HOSTID_LEN];
	struct utsname hw_utsname;

	/* If set, all blocks read will be copied to the specified directory. */
	char *vn_dumpdir = NULL;

	/* this only exists to have its address taken */
	struct proc p0;

	/*
	* =========================================================================
	* threads
	* =========================================================================
	*
	* TS_STACK_MIN is dictated by the minimum allowed pthread stack size. While
	* TS_STACK_MAX is somewhat arbitrary, it was selected to be large enough for
	* the expected stack depth while small enough to avoid exhausting address
	* space with high thread counts.
	*/
	#define TS_STACK_MIN MAX(PTHREAD_STACK_MIN, 32768)
	#define TS_STACK_MAX (256 * 1024)

	/ARGSUSED/
	kthread_t *
	zk_thread_create(void (func)(void ), void *arg, size_t stksize, int state)
	{
	pthread_attr_t attr;
	pthread_t tid;
	char *stkstr;
	int detachstate = PTHREAD_CREATE_DETACHED;

	VERIFY0(pthread_attr_init(&attr));

	if (state & TS_JOINABLE)
	detachstate = PTHREAD_CREATE_JOINABLE;

	VERIFY0(pthread_attr_setdetachstate(&attr, detachstate));

	/*
	* We allow the default stack size in user space to be specified by
	* setting the ZFS_STACK_SIZE environment variable. This allows us
	* the convenience of observing and debugging stack overruns in
	* user space. Explicitly specified stack sizes will be honored.
	* The usage of ZFS_STACK_SIZE is discussed further in the
	* ENVIRONMENT VARIABLES sections of the ztest(1) man page.
	*/
	if (stksize == 0) {
	stkstr = getenv("ZFS_STACK_SIZE");

	if (stkstr == NULL)
	stksize = TS_STACK_MAX;
	else
	stksize = MAX(atoi(stkstr), TS_STACK_MIN);
	}

	VERIFY3S(stksize, >, 0);
	stksize = P2ROUNDUP(MAX(stksize, TS_STACK_MIN), PAGESIZE);

	/*
	* If this ever fails, it may be because the stack size is not a
	* multiple of system page size.
	*/
	VERIFY0(pthread_attr_setstacksize(&attr, stksize));
	VERIFY0(pthread_attr_setguardsize(&attr, PAGESIZE));

	VERIFY0(pthread_create(&tid, &attr, (void ()(void *))func, arg));
	VERIFY0(pthread_attr_destroy(&attr));

	return ((void *)(uintptr_t)tid);
	}

	/*
	* =========================================================================
	* kstats
	* =========================================================================
	*/
	/ARGSUSED/
	kstat_t *
	kstat_create(const char module, int instance, const char name,
	const char *class, uchar_t type, ulong_t ndata, uchar_t ks_flag)
	{
	return (NULL);
	}

	/ARGSUSED/
	void
	kstat_install(kstat_t *ksp)
	{}

	/ARGSUSED/
	void
	kstat_delete(kstat_t *ksp)
	{}

	void
	kstat_set_raw_ops(kstat_t *ksp,
	int (headers)(char buf, size_t size),
	int (data)(char buf, size_t size, void *data),
	void (addr)(kstat_t *ksp, loff_t index))
	{}

	/*
	* =========================================================================
	* mutexes
	* =========================================================================
	*/

	void
	mutex_init(kmutex_t mp, char name, int type, void *cookie)
	{
	VERIFY0(pthread_mutex_init(&mp->m_lock, NULL));
	memset(&mp->m_owner, 0, sizeof (pthread_t));
	}

	void
	mutex_destroy(kmutex_t *mp)
	{
	VERIFY0(pthread_mutex_destroy(&mp->m_lock));
	}

	void
	mutex_enter(kmutex_t *mp)
	{
	VERIFY0(pthread_mutex_lock(&mp->m_lock));
	mp->m_owner = pthread_self();
	}

	int
	mutex_tryenter(kmutex_t *mp)
	{
	int error;

	error = pthread_mutex_trylock(&mp->m_lock);
	if (error == 0) {
	mp->m_owner = pthread_self();
	return (1);
	} else {
	VERIFY3S(error, ==, EBUSY);
	return (0);
	}
	}

	void
	mutex_exit(kmutex_t *mp)
	{
	memset(&mp->m_owner, 0, sizeof (pthread_t));
	VERIFY0(pthread_mutex_unlock(&mp->m_lock));
	}

	/*
	* =========================================================================
	* rwlocks
	* =========================================================================
	*/

	void
	rw_init(krwlock_t rwlp, char name, int type, void *arg)
	{
	VERIFY0(pthread_rwlock_init(&rwlp->rw_lock, NULL));
	rwlp->rw_readers = 0;
	rwlp->rw_owner = 0;
	}

	void
	rw_destroy(krwlock_t *rwlp)
	{
	VERIFY0(pthread_rwlock_destroy(&rwlp->rw_lock));
	}

	void
	rw_enter(krwlock_t *rwlp, krw_t rw)
	{
	if (rw == RW_READER) {
	VERIFY0(pthread_rwlock_rdlock(&rwlp->rw_lock));
	atomic_inc_uint(&rwlp->rw_readers);
	} else {
	VERIFY0(pthread_rwlock_wrlock(&rwlp->rw_lock));
	rwlp->rw_owner = pthread_self();
	}
	}

	void
	rw_exit(krwlock_t *rwlp)
	{
	if (RW_READ_HELD(rwlp))
	atomic_dec_uint(&rwlp->rw_readers);
	else
	rwlp->rw_owner = 0;

	VERIFY0(pthread_rwlock_unlock(&rwlp->rw_lock));
	}

	int
	rw_tryenter(krwlock_t *rwlp, krw_t rw)
	{
	int error;

	if (rw == RW_READER)
	error = pthread_rwlock_tryrdlock(&rwlp->rw_lock);
	else
	error = pthread_rwlock_trywrlock(&rwlp->rw_lock);

	if (error == 0) {
	if (rw == RW_READER)
	atomic_inc_uint(&rwlp->rw_readers);
	else
	rwlp->rw_owner = pthread_self();

	return (1);
	}

	VERIFY3S(error, ==, EBUSY);

	return (0);
	}

	/* ARGSUSED */
	uint32_t
	zone_get_hostid(void *zonep)
	{
	/*
	* We're emulating the system's hostid in userland.
	*/
	return (strtoul(hw_serial, NULL, 10));
	}

	int
	rw_tryupgrade(krwlock_t *rwlp)
	{
	return (0);
	}

	/*
	* =========================================================================
	* condition variables
	* =========================================================================
	*/

	void
	cv_init(kcondvar_t cv, char name, int type, void *arg)
	{
	VERIFY0(pthread_cond_init(cv, NULL));
	}

	void
	cv_destroy(kcondvar_t *cv)
	{
	VERIFY0(pthread_cond_destroy(cv));
	}

	void
	cv_wait(kcondvar_t cv, kmutex_t mp)
	{
	memset(&mp->m_owner, 0, sizeof (pthread_t));
	VERIFY0(pthread_cond_wait(cv, &mp->m_lock));
	mp->m_owner = pthread_self();
	}

	int
	cv_wait_sig(kcondvar_t cv, kmutex_t mp)
	{
	cv_wait(cv, mp);
	return (1);
	}

	int
	cv_timedwait(kcondvar_t cv, kmutex_t mp, clock_t abstime)
	{
	int error;
	struct timeval tv;
	struct timespec ts;
	clock_t delta;

	delta = abstime - ddi_get_lbolt();
	if (delta <= 0)
	return (-1);

	VERIFY(gettimeofday(&tv, NULL) == 0);

	ts.tv_sec = tv.tv_sec + delta / hz;
	ts.tv_nsec = tv.tv_usec * NSEC_PER_USEC + (delta % hz) * (NANOSEC / hz);
	if (ts.tv_nsec >= NANOSEC) {
	ts.tv_sec++;
	ts.tv_nsec -= NANOSEC;
	}

	memset(&mp->m_owner, 0, sizeof (pthread_t));
	error = pthread_cond_timedwait(cv, &mp->m_lock, &ts);
	mp->m_owner = pthread_self();

	if (error == ETIMEDOUT)
	return (-1);

	VERIFY0(error);

	return (1);
	}

	/ARGSUSED/
	int
	cv_timedwait_hires(kcondvar_t cv, kmutex_t mp, hrtime_t tim, hrtime_t res,
	int flag)
	{
	int error;
	struct timeval tv;
	struct timespec ts;
	hrtime_t delta;

	ASSERT(flag == 0 \|\| flag == CALLOUT_FLAG_ABSOLUTE);

	delta = tim;
	if (flag & CALLOUT_FLAG_ABSOLUTE)
	delta -= gethrtime();

	if (delta <= 0)
	return (-1);

	VERIFY0(gettimeofday(&tv, NULL));

	ts.tv_sec = tv.tv_sec + delta / NANOSEC;
	ts.tv_nsec = tv.tv_usec * NSEC_PER_USEC + (delta % NANOSEC);
	if (ts.tv_nsec >= NANOSEC) {
	ts.tv_sec++;
	ts.tv_nsec -= NANOSEC;
	}

	memset(&mp->m_owner, 0, sizeof (pthread_t));
	error = pthread_cond_timedwait(cv, &mp->m_lock, &ts);
	mp->m_owner = pthread_self();

	if (error == ETIMEDOUT)
	return (-1);

	VERIFY0(error);

	return (1);
	}

	void
	cv_signal(kcondvar_t *cv)
	{
	VERIFY0(pthread_cond_signal(cv));
	}

	void
	cv_broadcast(kcondvar_t *cv)
	{
	VERIFY0(pthread_cond_broadcast(cv));
	}

	/*
	* =========================================================================
	* procfs list
	* =========================================================================
	*/

	void
	seq_printf(struct seq_file m, const char fmt, ...)
	{}

	void
	procfs_list_install(const char *module,
	const char *submodule,
	const char *name,
	mode_t mode,
	procfs_list_t *procfs_list,
	int (show)(struct seq_file f, void *p),
	int (show_header)(struct seq_file f),
	int (clear)(procfs_list_t procfs_list),
	size_t procfs_list_node_off)
	{
	mutex_init(&procfs_list->pl_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&procfs_list->pl_list,
	procfs_list_node_off + sizeof (procfs_list_node_t),
	procfs_list_node_off + offsetof(procfs_list_node_t, pln_link));
	procfs_list->pl_next_id = 1;
	procfs_list->pl_node_offset = procfs_list_node_off;
	}

	void
	procfs_list_uninstall(procfs_list_t *procfs_list)
	{}

	void
	procfs_list_destroy(procfs_list_t *procfs_list)
	{
	ASSERT(list_is_empty(&procfs_list->pl_list));
	list_destroy(&procfs_list->pl_list);
	mutex_destroy(&procfs_list->pl_lock);
	}

	#define NODE_ID(procfs_list, obj) \
	(((procfs_list_node_t )(((char )obj) + \
	(procfs_list)->pl_node_offset))->pln_id)

	void
	procfs_list_add(procfs_list_t procfs_list, void p)
	{
	ASSERT(MUTEX_HELD(&procfs_list->pl_lock));
	NODE_ID(procfs_list, p) = procfs_list->pl_next_id++;
	list_insert_tail(&procfs_list->pl_list, p);
	}

	/*
	* =========================================================================
	* vnode operations
	* =========================================================================
	*/

	/*
	* =========================================================================
	* Figure out which debugging statements to print
	* =========================================================================
	*/

	static char *dprintf_string;
	static int dprintf_print_all;

	int
	dprintf_find_string(const char *string)
	{
	char *tmp_str = dprintf_string;
	int len = strlen(string);

	/*
	* Find out if this is a string we want to print.
	* String format: file1.c,function_name1,file2.c,file3.c
	*/

	while (tmp_str != NULL) {
	if (strncmp(tmp_str, string, len) == 0 &&
	(tmp_str[len] == ',' \|\| tmp_str[len] == '\0'))
	return (1);
	tmp_str = strchr(tmp_str, ',');
	if (tmp_str != NULL)
	tmp_str++; /* Get rid of , */
	}
	return (0);
	}

	void
	dprintf_setup(int argc, char *argv)
	{
	int i, j;

	/*
	* Debugging can be specified two ways: by setting the
	* environment variable ZFS_DEBUG, or by including a
	* "debug=..." argument on the command line. The command
	* line setting overrides the environment variable.
	*/

	for (i = 1; i < *argc; i++) {
	int len = strlen("debug=");
	/* First look for a command line argument */
	if (strncmp("debug=", argv[i], len) == 0) {
	dprintf_string = argv[i] + len;
	/* Remove from args */
	for (j = i; j < *argc; j++)
	argv[j] = argv[j+1];
	argv[j] = NULL;
	(*argc)--;
	}
	}

	if (dprintf_string == NULL) {
	/* Look for ZFS_DEBUG environment variable */
	dprintf_string = getenv("ZFS_DEBUG");
	}

	/*
	* Are we just turning on all debugging?
	*/
	if (dprintf_find_string("on"))
	dprintf_print_all = 1;

	if (dprintf_string != NULL)
	zfs_flags \|= ZFS_DEBUG_DPRINTF;
	}

	/*
	* =========================================================================
	* debug printfs
	* =========================================================================
	*/
	void
	__dprintf(boolean_t dprint, const char file, const char func,
	int line, const char *fmt, ...)
	{
	const char *newfile;
	va_list adx;

	/*
	* Get rid of annoying "../common/" prefix to filename.
	*/
	newfile = strrchr(file, '/');
	if (newfile != NULL) {
	newfile = newfile + 1; /* Get rid of leading / */
	} else {
	newfile = file;
	}

	if (dprint) {
	/* dprintf messages are printed immediately */

	if (!dprintf_print_all &&
	!dprintf_find_string(newfile) &&
	!dprintf_find_string(func))
	return;

	/* Print out just the function name if requested */
	flockfile(stdout);
	if (dprintf_find_string("pid"))
	(void) printf("%d ", getpid());
	if (dprintf_find_string("tid"))
	(void) printf("%ju ",
	(uintmax_t)(uintptr_t)pthread_self());
	if (dprintf_find_string("cpu"))
	(void) printf("%u ", getcpuid());
	if (dprintf_find_string("time"))
	(void) printf("%llu ", gethrtime());
	if (dprintf_find_string("long"))
	(void) printf("%s, line %d: ", newfile, line);
	(void) printf("dprintf: %s: ", func);
	va_start(adx, fmt);
	(void) vprintf(fmt, adx);
	va_end(adx);
	funlockfile(stdout);
	} else {
	/* zfs_dbgmsg is logged for dumping later */
	size_t size;
	char *buf;
	int i;

	size = 1024;
	buf = umem_alloc(size, UMEM_NOFAIL);
	i = snprintf(buf, size, "%s:%d:%s(): ", newfile, line, func);

	if (i < size) {
	va_start(adx, fmt);
	(void) vsnprintf(buf + i, size - i, fmt, adx);
	va_end(adx);
	}

	__zfs_dbgmsg(buf);

	umem_free(buf, size);
	}
	}

	/*
	* =========================================================================
	* cmn_err() and panic()
	* =========================================================================
	*/
	static char ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
	static char ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };

	void
	vpanic(const char *fmt, va_list adx)
	{
	(void) fprintf(stderr, "error: ");
	(void) vfprintf(stderr, fmt, adx);
	(void) fprintf(stderr, "\n");

	abort(); /* think of it as a "user-level crash dump" */
	}

	void
	panic(const char *fmt, ...)
	{
	va_list adx;

	va_start(adx, fmt);
	vpanic(fmt, adx);
	va_end(adx);
	}

	void
	vcmn_err(int ce, const char *fmt, va_list adx)
	{
	if (ce == CE_PANIC)
	vpanic(fmt, adx);
	if (ce != CE_NOTE) { /* suppress noise in userland stress testing */
	(void) fprintf(stderr, "%s", ce_prefix[ce]);
	(void) vfprintf(stderr, fmt, adx);
	(void) fprintf(stderr, "%s", ce_suffix[ce]);
	}
	}

	/PRINTFLIKE2/
	void
	cmn_err(int ce, const char *fmt, ...)
	{
	va_list adx;

	va_start(adx, fmt);
	vcmn_err(ce, fmt, adx);
	va_end(adx);
	}

	/*
	* =========================================================================
	* misc routines
	* =========================================================================
	*/

	void
	delay(clock_t ticks)
	{
	(void) poll(0, 0, ticks * (1000 / hz));
	}

	/*
	* Find highest one bit set.
	* Returns bit number + 1 of highest bit that is set, otherwise returns 0.
	* The __builtin_clzll() function is supported by both GCC and Clang.
	*/
	int
	highbit64(uint64_t i)
	{
	if (i == 0)
	return (0);

	return (NBBY * sizeof (uint64_t) - __builtin_clzll(i));
	}

	/*
	* Find lowest one bit set.
	* Returns bit number + 1 of lowest bit that is set, otherwise returns 0.
	* The __builtin_ffsll() function is supported by both GCC and Clang.
	*/
	int
	lowbit64(uint64_t i)
	{
	if (i == 0)
	return (0);

	return (__builtin_ffsll(i));
	}

	const char *random_path = "/dev/random";
	const char *urandom_path = "/dev/urandom";
	static int random_fd = -1, urandom_fd = -1;

	void
	random_init(void)
	{
	VERIFY((random_fd = open(random_path, O_RDONLY \| O_CLOEXEC)) != -1);
	VERIFY((urandom_fd = open(urandom_path, O_RDONLY \| O_CLOEXEC)) != -1);
	}

	void
	random_fini(void)
	{
	close(random_fd);
	close(urandom_fd);

	random_fd = -1;
	urandom_fd = -1;
	}

	static int
	random_get_bytes_common(uint8_t *ptr, size_t len, int fd)
	{
	size_t resid = len;
	ssize_t bytes;

	ASSERT(fd != -1);

	while (resid != 0) {
	bytes = read(fd, ptr, resid);
	ASSERT3S(bytes, >=, 0);
	ptr += bytes;
	resid -= bytes;
	}

	return (0);
	}

	int
	random_get_bytes(uint8_t *ptr, size_t len)
	{
	return (random_get_bytes_common(ptr, len, random_fd));
	}

	int
	random_get_pseudo_bytes(uint8_t *ptr, size_t len)
	{
	return (random_get_bytes_common(ptr, len, urandom_fd));
	}

	int
	ddi_strtoul(const char hw_serial, char nptr, int base, unsigned long result)
	{
	char *end;

	*result = strtoul(hw_serial, &end, base);
	if (*result == 0)
	return (errno);
	return (0);
	}

	int
	ddi_strtoull(const char str, char nptr, int base, u_longlong_t result)
	{
	char *end;

	*result = strtoull(str, &end, base);
	if (*result == 0)
	return (errno);
	return (0);
	}

	utsname_t *
	utsname(void)
	{
	return (&hw_utsname);
	}

	/*
	* =========================================================================
	* kernel emulation setup & teardown
	* =========================================================================
	*/
	static int
	umem_out_of_memory(void)
	{
	char errmsg[] = "out of memory -- generating core dump\n";

	(void) fprintf(stderr, "%s", errmsg);
	abort();
	return (0);
	}

	void
	kernel_init(int mode)
	{
	extern uint_t rrw_tsd_key;

	umem_nofail_callback(umem_out_of_memory);

	physmem = sysconf(_SC_PHYS_PAGES);

	dprintf("physmem = %llu pages (%.2f GB)\n", (u_longlong_t)physmem,
	(double)physmem * sysconf(_SC_PAGE_SIZE) / (1ULL << 30));

	(void) snprintf(hw_serial, sizeof (hw_serial), "%ld",
	(mode & SPA_MODE_WRITE) ? get_system_hostid() : 0);

	random_init();

	VERIFY0(uname(&hw_utsname));

	system_taskq_init();
	icp_init();

	zstd_init();

	spa_init((spa_mode_t)mode);

	fletcher_4_init();

	tsd_create(&rrw_tsd_key, rrw_tsd_destroy);
	}

	void
	kernel_fini(void)
	{
	fletcher_4_fini();
	spa_fini();

	zstd_fini();

	icp_fini();
	system_taskq_fini();

	random_fini();
	}

	uid_t
	crgetuid(cred_t *cr)
	{
	return (0);
	}

	uid_t
	crgetruid(cred_t *cr)
	{
	return (0);
	}

	gid_t
	crgetgid(cred_t *cr)
	{
	return (0);
	}

	int
	crgetngroups(cred_t *cr)
	{
	return (0);
	}

	gid_t *
	crgetgroups(cred_t *cr)
	{
	return (NULL);
	}

	int
	zfs_secpolicy_snapshot_perms(const char name, cred_t cr)
	{
	return (0);
	}

	int
	zfs_secpolicy_rename_perms(const char from, const char to, cred_t *cr)
	{
	return (0);
	}

	int
	zfs_secpolicy_destroy_perms(const char name, cred_t cr)
	{
	return (0);
	}

	int
	secpolicy_zfs(const cred_t *cr)
	{
	return (0);
	}

	int
	secpolicy_zfs_proc(const cred_t cr, proc_t proc)
	{
	return (0);
	}

	ksiddomain_t *
	ksid_lookupdomain(const char *dom)
	{
	ksiddomain_t *kd;

	kd = umem_zalloc(sizeof (ksiddomain_t), UMEM_NOFAIL);
	kd->kd_name = spa_strdup(dom);
	return (kd);
	}

	void
	ksiddomain_rele(ksiddomain_t *ksid)
	{
	spa_strfree(ksid->kd_name);
	umem_free(ksid, sizeof (ksiddomain_t));
	}

	char *
	kmem_vasprintf(const char *fmt, va_list adx)
	{
	char *buf = NULL;
	va_list adx_copy;

	va_copy(adx_copy, adx);
	VERIFY(vasprintf(&buf, fmt, adx_copy) != -1);
	va_end(adx_copy);

	return (buf);
	}

	char *
	kmem_asprintf(const char *fmt, ...)
	{
	char *buf = NULL;
	va_list adx;

	va_start(adx, fmt);
	VERIFY(vasprintf(&buf, fmt, adx) != -1);
	va_end(adx);

	return (buf);
	}

	/* ARGSUSED */
	-int
	+zfs_file_t *
	zfs_onexit_fd_hold(int fd, minor_t *minorp)
	{
	*minorp = 0;
	- return (0);
	+ return (NULL);
	}

	/* ARGSUSED */
	void
	-zfs_onexit_fd_rele(int fd)
	+zfs_onexit_fd_rele(zfs_file_t *fp)
	{
	}

	/* ARGSUSED */
	int
	zfs_onexit_add_cb(minor_t minor, void (func)(void ), void *data,
	uint64_t *action_handle)
	{
	return (0);
	}

	fstrans_cookie_t
	spl_fstrans_mark(void)
	{
	return ((fstrans_cookie_t)0);
	}

	void
	spl_fstrans_unmark(fstrans_cookie_t cookie)
	{
	}

	int
	__spl_pf_fstrans_check(void)
	{
	return (0);
	}

	int
	kmem_cache_reap_active(void)
	{
	return (0);
	}

	void *zvol_tag = "zvol_tag";

	void
	zvol_create_minor(const char *name)
	{
	}

	void
	zvol_create_minors_recursive(const char *name)
	{
	}

	void
	zvol_remove_minors(spa_t spa, const char name, boolean_t async)
	{
	}

	void
	zvol_rename_minors(spa_t spa, const char oldname, const char *newname,
	boolean_t async)
	{
	}

	/*
	* Open file
	*
	* path - fully qualified path to file
	* flags - file attributes O_READ / O_WRITE / O_EXCL
	* fpp - pointer to return file pointer
	*
	* Returns 0 on success underlying error on failure.
	*/
	int
	zfs_file_open(const char path, int flags, int mode, zfs_file_t *fpp)
	{
	int fd = -1;
	int dump_fd = -1;
	int err;
	int old_umask = 0;
	zfs_file_t *fp;
	struct stat64 st;

	if (!(flags & O_CREAT) && stat64(path, &st) == -1)
	return (errno);

	if (!(flags & O_CREAT) && S_ISBLK(st.st_mode))
	flags \|= O_DIRECT;

	if (flags & O_CREAT)
	old_umask = umask(0);

	fd = open64(path, flags, mode);
	if (fd == -1)
	return (errno);

	if (flags & O_CREAT)
	(void) umask(old_umask);

	if (vn_dumpdir != NULL) {
	char *dumppath = umem_zalloc(MAXPATHLEN, UMEM_NOFAIL);
	char inpath = basename((char )(uintptr_t)path);

	(void) snprintf(dumppath, MAXPATHLEN,
	"%s/%s", vn_dumpdir, inpath);
	dump_fd = open64(dumppath, O_CREAT \| O_WRONLY, 0666);
	umem_free(dumppath, MAXPATHLEN);
	if (dump_fd == -1) {
	err = errno;
	close(fd);
	return (err);
	}
	} else {
	dump_fd = -1;
	}

	(void) fcntl(fd, F_SETFD, FD_CLOEXEC);

	fp = umem_zalloc(sizeof (zfs_file_t), UMEM_NOFAIL);
	fp->f_fd = fd;
	fp->f_dump_fd = dump_fd;
	*fpp = fp;

	return (0);
	}

	void
	zfs_file_close(zfs_file_t *fp)
	{
	close(fp->f_fd);
	if (fp->f_dump_fd != -1)
	close(fp->f_dump_fd);

	umem_free(fp, sizeof (zfs_file_t));
	}

	/*
	* Stateful write - use os internal file pointer to determine where to
	* write and update on successful completion.
	*
	* fp - pointer to file (pipe, socket, etc) to write to
	* buf - buffer to write
	* count - # of bytes to write
	* resid - pointer to count of unwritten bytes (if short write)
	*
	* Returns 0 on success errno on failure.
	*/
	int
	zfs_file_write(zfs_file_t fp, const void buf, size_t count, ssize_t *resid)
	{
	ssize_t rc;

	rc = write(fp->f_fd, buf, count);
	if (rc < 0)
	return (errno);

	if (resid) {
	*resid = count - rc;
	} else if (rc != count) {
	return (EIO);
	}

	return (0);
	}

	/*
	* Stateless write - os internal file pointer is not updated.
	*
	* fp - pointer to file (pipe, socket, etc) to write to
	* buf - buffer to write
	* count - # of bytes to write
	* off - file offset to write to (only valid for seekable types)
	* resid - pointer to count of unwritten bytes
	*
	* Returns 0 on success errno on failure.
	*/
	int
	zfs_file_pwrite(zfs_file_t fp, const void buf,
	size_t count, loff_t pos, ssize_t *resid)
	{
	ssize_t rc, split, done;
	int sectors;

	/*
	* To simulate partial disk writes, we split writes into two
	* system calls so that the process can be killed in between.
	* This is used by ztest to simulate realistic failure modes.
	*/
	sectors = count >> SPA_MINBLOCKSHIFT;
	split = (sectors > 0 ? rand() % sectors : 0) << SPA_MINBLOCKSHIFT;
	rc = pwrite64(fp->f_fd, buf, split, pos);
	if (rc != -1) {
	done = rc;
	rc = pwrite64(fp->f_fd, (char *)buf + split,
	count - split, pos + split);
	}
	#ifdef __linux__
	if (rc == -1 && errno == EINVAL) {
	/*
	* Under Linux, this most likely means an alignment issue
	* (memory or disk) due to O_DIRECT, so we abort() in order
	* to catch the offender.
	*/
	abort();
	}
	#endif

	if (rc < 0)
	return (errno);

	done += rc;

	if (resid) {
	*resid = count - done;
	} else if (done != count) {
	return (EIO);
	}

	return (0);
	}

	/*
	* Stateful read - use os internal file pointer to determine where to
	* read and update on successful completion.
	*
	* fp - pointer to file (pipe, socket, etc) to read from
	* buf - buffer to write
	* count - # of bytes to read
	* resid - pointer to count of unread bytes (if short read)
	*
	* Returns 0 on success errno on failure.
	*/
	int
	zfs_file_read(zfs_file_t fp, void buf, size_t count, ssize_t *resid)
	{
	int rc;

	rc = read(fp->f_fd, buf, count);
	if (rc < 0)
	return (errno);

	if (resid) {
	*resid = count - rc;
	} else if (rc != count) {
	return (EIO);
	}

	return (0);
	}

	/*
	* Stateless read - os internal file pointer is not updated.
	*
	* fp - pointer to file (pipe, socket, etc) to read from
	* buf - buffer to write
	* count - # of bytes to write
	* off - file offset to read from (only valid for seekable types)
	* resid - pointer to count of unwritten bytes (if short write)
	*
	* Returns 0 on success errno on failure.
	*/
	int
	zfs_file_pread(zfs_file_t fp, void buf, size_t count, loff_t off,
	ssize_t *resid)
	{
	ssize_t rc;

	rc = pread64(fp->f_fd, buf, count, off);
	if (rc < 0) {
	#ifdef __linux__
	/*
	* Under Linux, this most likely means an alignment issue
	* (memory or disk) due to O_DIRECT, so we abort() in order to
	* catch the offender.
	*/
	if (errno == EINVAL)
	abort();
	#endif
	return (errno);
	}

	if (fp->f_dump_fd != -1) {
	int status;

	status = pwrite64(fp->f_dump_fd, buf, rc, off);
	ASSERT(status != -1);
	}

	if (resid) {
	*resid = count - rc;
	} else if (rc != count) {
	return (EIO);
	}

	return (0);
	}

	/*
	* lseek - set / get file pointer
	*
	* fp - pointer to file (pipe, socket, etc) to read from
	* offp - value to seek to, returns current value plus passed offset
	* whence - see man pages for standard lseek whence values
	*
	* Returns 0 on success errno on failure (ESPIPE for non seekable types)
	*/
	int
	zfs_file_seek(zfs_file_t fp, loff_t offp, int whence)
	{
	loff_t rc;

	rc = lseek(fp->f_fd, *offp, whence);
	if (rc < 0)
	return (errno);

	*offp = rc;

	return (0);
	}

	/*
	* Get file attributes
	*
	* filp - file pointer
	* zfattr - pointer to file attr structure
	*
	* Currently only used for fetching size and file mode
	*
	* Returns 0 on success or error code of underlying getattr call on failure.
	*/
	int
	zfs_file_getattr(zfs_file_t fp, zfs_file_attr_t zfattr)
	{
	struct stat64 st;

	if (fstat64_blk(fp->f_fd, &st) == -1)
	return (errno);

	zfattr->zfa_size = st.st_size;
	zfattr->zfa_mode = st.st_mode;

	return (0);
	}

	/*
	* Sync file to disk
	*
	* filp - file pointer
	* flags - O_SYNC and or O_DSYNC
	*
	* Returns 0 on success or error code of underlying sync call on failure.
	*/
	int
	zfs_file_fsync(zfs_file_t *fp, int flags)
	{
	int rc;

	rc = fsync(fp->f_fd);
	if (rc < 0)
	return (errno);

	return (0);
	}

	/*
	* fallocate - allocate or free space on disk
	*
	* fp - file pointer
	* mode (non-standard options for hole punching etc)
	* offset - offset to start allocating or freeing from
	* len - length to free / allocate
	*
	* OPTIONAL
	*/
	int
	zfs_file_fallocate(zfs_file_t *fp, int mode, loff_t offset, loff_t len)
	{
	#ifdef __linux__
	return (fallocate(fp->f_fd, mode, offset, len));
	#else
	return (EOPNOTSUPP);
	#endif
	}

	/*
	* Request current file pointer offset
	*
	* fp - pointer to file
	*
	* Returns current file offset.
	*/
	loff_t
	zfs_file_off(zfs_file_t *fp)
	{
	return (lseek(fp->f_fd, SEEK_CUR, 0));
	}

	/*
	* unlink file
	*
	* path - fully qualified file path
	*
	* Returns 0 on success.
	*
	* OPTIONAL
	*/
	int
	zfs_file_unlink(const char *path)
	{
	return (remove(path));
	}

	/*
	* Get reference to file pointer
	*
	* fd - input file descriptor
	- * fpp - pointer to file pointer
	*
	- * Returns 0 on success EBADF on failure.
	+ * Returns pointer to file struct or NULL.
	* Unsupported in user space.
	*/
	-int
	-zfs_file_get(int fd, zfs_file_t **fpp)
	+zfs_file_t *
	+zfs_file_get(int fd)
	{
	abort();

	- return (EOPNOTSUPP);
	+ return (NULL);
	}
	-
	/*
	* Drop reference to file pointer
	*
	- * fd - input file descriptor
	+ * fp - pointer to file struct
	*
	* Unsupported in user space.
	*/
	void
	-zfs_file_put(int fd)
	+zfs_file_put(zfs_file_t *fp)
	{
	abort();
	}

	void
	zfsvfs_update_fromname(const char oldname, const char newname)
	{
	}
	diff --git a/sys/contrib/openzfs/man/man4/zfs.4 b/sys/contrib/openzfs/man/man4/zfs.4
	index 6da8d42b42bd..2aed6895754a 100644
	--- a/sys/contrib/openzfs/man/man4/zfs.4
	+++ b/sys/contrib/openzfs/man/man4/zfs.4
	@@ -1,2380 +1,2382 @@
	.\"
	.\" Copyright (c) 2013 by Turbo Fredriksson <turbo@bayour.com>. All rights reserved.
	.\" Copyright (c) 2019, 2021 by Delphix. All rights reserved.
	.\" Copyright (c) 2019 Datto Inc.
	.\" The contents of this file are subject to the terms of the Common Development
	.\" and Distribution License (the "License"). You may not use this file except
	.\" in compliance with the License. You can obtain a copy of the license at
	.\" usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.
	.\"
	.\" See the License for the specific language governing permissions and
	.\" limitations under the License. When distributing Covered Code, include this
	.\" CDDL HEADER in each file and include the License file at
	.\" usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this
	.\" CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your
	.\" own identifying information:
	.\" Portions Copyright [yyyy] [name of copyright owner]
	.\"
	.Dd June 1, 2021
	.Dt ZFS 4
	.Os
	.
	.Sh NAME
	.Nm zfs
	.Nd tuning of the ZFS kernel module
	.
	.Sh DESCRIPTION
	The ZFS module supports these parameters:
	.Bl -tag -width Ds
	.It Sy dbuf_cache_max_bytes Ns = Ns Sy ULONG_MAX Ns B Pq ulong
	Maximum size in bytes of the dbuf cache.
	The target size is determined by the MIN versus
	.No 1/2^ Ns Sy dbuf_cache_shift Pq 1/32nd
	of the target ARC size.
	The behavior of the dbuf cache and its associated settings
	can be observed via the
	.Pa /proc/spl/kstat/zfs/dbufstats
	kstat.
	.
	.It Sy dbuf_metadata_cache_max_bytes Ns = Ns Sy ULONG_MAX Ns B Pq ulong
	Maximum size in bytes of the metadata dbuf cache.
	The target size is determined by the MIN versus
	.No 1/2^ Ns Sy dbuf_metadata_cache_shift Pq 1/64th
	of the target ARC size.
	The behavior of the metadata dbuf cache and its associated settings
	can be observed via the
	.Pa /proc/spl/kstat/zfs/dbufstats
	kstat.
	.
	.It Sy dbuf_cache_hiwater_pct Ns = Ns Sy 10 Ns % Pq uint
	The percentage over
	.Sy dbuf_cache_max_bytes
	when dbufs must be evicted directly.
	.
	.It Sy dbuf_cache_lowater_pct Ns = Ns Sy 10 Ns % Pq uint
	The percentage below
	.Sy dbuf_cache_max_bytes
	when the evict thread stops evicting dbufs.
	.
	.It Sy dbuf_cache_shift Ns = Ns Sy 5 Pq int
	Set the size of the dbuf cache
	.Pq Sy dbuf_cache_max_bytes
	to a log2 fraction of the target ARC size.
	.
	.It Sy dbuf_metadata_cache_shift Ns = Ns Sy 6 Pq int
	Set the size of the dbuf metadata cache
	.Pq Sy dbuf_metadata_cache_max_bytes
	to a log2 fraction of the target ARC size.
	.
	.It Sy dmu_object_alloc_chunk_shift Ns = Ns Sy 7 Po 128 Pc Pq int
	dnode slots allocated in a single operation as a power of 2.
	The default value minimizes lock contention for the bulk operation performed.
	.
	.It Sy dmu_prefetch_max Ns = Ns Sy 134217728 Ns B Po 128MB Pc Pq int
	Limit the amount we can prefetch with one call to this amount in bytes.
	This helps to limit the amount of memory that can be used by prefetching.
	.
	.It Sy ignore_hole_birth Pq int
	Alias for
	.Sy send_holes_without_birth_time .
	.
	.It Sy l2arc_feed_again Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Turbo L2ARC warm-up.
	When the L2ARC is cold the fill interval will be set as fast as possible.
	.
	.It Sy l2arc_feed_min_ms Ns = Ns Sy 200 Pq ulong
	Min feed interval in milliseconds.
	Requires
	.Sy l2arc_feed_again Ns = Ns Ar 1
	and only applicable in related situations.
	.
	.It Sy l2arc_feed_secs Ns = Ns Sy 1 Pq ulong
	Seconds between L2ARC writing.
	.
	.It Sy l2arc_headroom Ns = Ns Sy 2 Pq ulong
	How far through the ARC lists to search for L2ARC cacheable content,
	expressed as a multiplier of
	.Sy l2arc_write_max .
	ARC persistence across reboots can be achieved with persistent L2ARC
	by setting this parameter to
	.Sy 0 ,
	allowing the full length of ARC lists to be searched for cacheable content.
	.
	.It Sy l2arc_headroom_boost Ns = Ns Sy 200 Ns % Pq ulong
	Scales
	.Sy l2arc_headroom
	by this percentage when L2ARC contents are being successfully compressed
	before writing.
	A value of
	.Sy 100
	disables this feature.
	.
	.It Sy l2arc_mfuonly Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Controls whether only MFU metadata and data are cached from ARC into L2ARC.
	This may be desired to avoid wasting space on L2ARC when reading/writing large
	amounts of data that are not expected to be accessed more than once.
	.Pp
	The default is off,
	meaning both MRU and MFU data and metadata are cached.
	When turning off this feature, some MRU buffers will still be present
	in ARC and eventually cached on L2ARC.
	.No If Sy l2arc_noprefetch Ns = Ns Sy 0 ,
	some prefetched buffers will be cached to L2ARC, and those might later
	transition to MRU, in which case the
	.Sy l2arc_mru_asize No arcstat will not be Sy 0 .
	.Pp
	Regardless of
	.Sy l2arc_noprefetch ,
	some MFU buffers might be evicted from ARC,
	accessed later on as prefetches and transition to MRU as prefetches.
	If accessed again they are counted as MRU and the
	.Sy l2arc_mru_asize No arcstat will not be Sy 0 .
	.Pp
	The ARC status of L2ARC buffers when they were first cached in
	L2ARC can be seen in the
	.Sy l2arc_mru_asize , Sy l2arc_mfu_asize , No and Sy l2arc_prefetch_asize
	arcstats when importing the pool or onlining a cache
	device if persistent L2ARC is enabled.
	.Pp
	The
	.Sy evict_l2_eligible_mru
	arcstat does not take into account if this option is enabled as the information
	provided by the
	.Sy evict_l2_eligible_m[rf]u
	arcstats can be used to decide if toggling this option is appropriate
	for the current workload.
	.
	.It Sy l2arc_meta_percent Ns = Ns Sy 33 Ns % Pq int
	Percent of ARC size allowed for L2ARC-only headers.
	Since L2ARC buffers are not evicted on memory pressure,
	too many headers on a system with an irrationally large L2ARC
	can render it slow or unusable.
	This parameter limits L2ARC writes and rebuilds to achieve the target.
	.
	.It Sy l2arc_trim_ahead Ns = Ns Sy 0 Ns % Pq ulong
	Trims ahead of the current write size
	.Pq Sy l2arc_write_max
	on L2ARC devices by this percentage of write size if we have filled the device.
	If set to
	.Sy 100
	we TRIM twice the space required to accommodate upcoming writes.
	A minimum of
	.Sy 64MB
	will be trimmed.
	It also enables TRIM of the whole L2ARC device upon creation
	or addition to an existing pool or if the header of the device is
	invalid upon importing a pool or onlining a cache device.
	A value of
	.Sy 0
	disables TRIM on L2ARC altogether and is the default as it can put significant
	stress on the underlying storage devices.
	This will vary depending of how well the specific device handles these commands.
	.
	.It Sy l2arc_noprefetch Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Do not write buffers to L2ARC if they were prefetched but not used by
	applications.
	In case there are prefetched buffers in L2ARC and this option
	is later set, we do not read the prefetched buffers from L2ARC.
	Unsetting this option is useful for caching sequential reads from the
	disks to L2ARC and serve those reads from L2ARC later on.
	This may be beneficial in case the L2ARC device is significantly faster
	in sequential reads than the disks of the pool.
	.Pp
	Use
	.Sy 1
	to disable and
	.Sy 0
	to enable caching/reading prefetches to/from L2ARC.
	.
	.It Sy l2arc_norw Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	No reads during writes.
	.
	.It Sy l2arc_write_boost Ns = Ns Sy 8388608 Ns B Po 8MB Pc Pq ulong
	Cold L2ARC devices will have
	.Sy l2arc_write_max
	increased by this amount while they remain cold.
	.
	.It Sy l2arc_write_max Ns = Ns Sy 8388608 Ns B Po 8MB Pc Pq ulong
	Max write bytes per interval.
	.
	.It Sy l2arc_rebuild_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Rebuild the L2ARC when importing a pool (persistent L2ARC).
	This can be disabled if there are problems importing a pool
	or attaching an L2ARC device (e.g. the L2ARC device is slow
	in reading stored log metadata, or the metadata
	has become somehow fragmented/unusable).
	.
	.It Sy l2arc_rebuild_blocks_min_l2size Ns = Ns Sy 1073741824 Ns B Po 1GB Pc Pq ulong
	Mininum size of an L2ARC device required in order to write log blocks in it.
	The log blocks are used upon importing the pool to rebuild the persistent L2ARC.
	.Pp
	For L2ARC devices less than 1GB, the amount of data
	.Fn l2arc_evict
	evicts is significant compared to the amount of restored L2ARC data.
	In this case, do not write log blocks in L2ARC in order not to waste space.
	.
	.It Sy metaslab_aliquot Ns = Ns Sy 524288 Ns B Po 512kB Pc Pq ulong
	Metaslab granularity, in bytes.
	This is roughly similar to what would be referred to as the "stripe size"
	in traditional RAID arrays.
	In normal operation, ZFS will try to write this amount of data
	to a top-level vdev before moving on to the next one.
	.
	.It Sy metaslab_bias_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Enable metaslab group biasing based on their vdevs' over- or under-utilization
	relative to the pool.
	.
	.It Sy metaslab_force_ganging Ns = Ns Sy 16777217 Ns B Ns B Po 16MB + 1B Pc Pq ulong
	Make some blocks above a certain size be gang blocks.
	This option is used by the test suite to facilitate testing.
	.
	.It Sy zfs_history_output_max Ns = Ns Sy 1048576 Ns B Ns B Po 1MB Pc Pq int
	When attempting to log an output nvlist of an ioctl in the on-disk history,
	the output will not be stored if it is larger than this size (in bytes).
	This must be less than
	.Sy DMU_MAX_ACCESS Pq 64MB .
	This applies primarily to
	.Fn zfs_ioc_channel_program Pq cf. Xr zfs-program 8 .
	.
	.It Sy zfs_keep_log_spacemaps_at_export Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Prevent log spacemaps from being destroyed during pool exports and destroys.
	.
	.It Sy zfs_metaslab_segment_weight_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Enable/disable segment-based metaslab selection.
	.
	.It Sy zfs_metaslab_switch_threshold Ns = Ns Sy 2 Pq int
	When using segment-based metaslab selection, continue allocating
	from the active metaslab until this option's
	worth of buckets have been exhausted.
	.
	.It Sy metaslab_debug_load Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Load all metaslabs during pool import.
	.
	.It Sy metaslab_debug_unload Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Prevent metaslabs from being unloaded.
	.
	.It Sy metaslab_fragmentation_factor_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Enable use of the fragmentation metric in computing metaslab weights.
	.
	.It Sy metaslab_df_max_search Ns = Ns Sy 16777216 Ns B Po 16MB Pc Pq int
	Maximum distance to search forward from the last offset.
	Without this limit, fragmented pools can see
	.Em >100`000
	iterations and
	.Fn metaslab_block_picker
	becomes the performance limiting factor on high-performance storage.
	.Pp
	With the default setting of
	.Sy 16MB ,
	we typically see less than
	.Em 500
	iterations, even with very fragmented
	.Sy ashift Ns = Ns Sy 9
	pools.
	The maximum number of iterations possible is
	.Sy metaslab_df_max_search / 2^(ashift+1) .
	With the default setting of
	.Sy 16MB
	this is
	.Em 16*1024 Pq with Sy ashift Ns = Ns Sy 9
	or
	.Em 2*1024 Pq with Sy ashift Ns = Ns Sy 12 .
	.
	.It Sy metaslab_df_use_largest_segment Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	If not searching forward (due to
	.Sy metaslab_df_max_search , metaslab_df_free_pct ,
	.No or Sy metaslab_df_alloc_threshold ) ,
	this tunable controls which segment is used.
	If set, we will use the largest free segment.
	If unset, we will use a segment of at least the requested size.
	.
	.It Sy zfs_metaslab_max_size_cache_sec Ns = Ns Sy 3600 Ns s Po 1h Pc Pq ulong
	When we unload a metaslab, we cache the size of the largest free chunk.
	We use that cached size to determine whether or not to load a metaslab
	for a given allocation.
	As more frees accumulate in that metaslab while it's unloaded,
	the cached max size becomes less and less accurate.
	After a number of seconds controlled by this tunable,
	we stop considering the cached max size and start
	considering only the histogram instead.
	.
	.It Sy zfs_metaslab_mem_limit Ns = Ns Sy 25 Ns % Pq int
	When we are loading a new metaslab, we check the amount of memory being used
	to store metaslab range trees.
	If it is over a threshold, we attempt to unload the least recently used metaslab
	to prevent the system from clogging all of its memory with range trees.
	This tunable sets the percentage of total system memory that is the threshold.
	.
	.It Sy zfs_metaslab_try_hard_before_gang Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	.Bl -item -compact
	.It
	If unset, we will first try normal allocation.
	.It
	If that fails then we will do a gang allocation.
	.It
	If that fails then we will do a "try hard" gang allocation.
	.It
	If that fails then we will have a multi-layer gang block.
	.El
	.Pp
	.Bl -item -compact
	.It
	If set, we will first try normal allocation.
	.It
	If that fails then we will do a "try hard" allocation.
	.It
	If that fails we will do a gang allocation.
	.It
	If that fails we will do a "try hard" gang allocation.
	.It
	If that fails then we will have a multi-layer gang block.
	.El
	.
	.It Sy zfs_metaslab_find_max_tries Ns = Ns Sy 100 Pq int
	When not trying hard, we only consider this number of the best metaslabs.
	This improves performance, especially when there are many metaslabs per vdev
	and the allocation can't actually be satisfied
	(so we would otherwise iterate all metaslabs).
	.
	.It Sy zfs_vdev_default_ms_count Ns = Ns Sy 200 Pq int
	When a vdev is added, target this number of metaslabs per top-level vdev.
	.
	.It Sy zfs_vdev_default_ms_shift Ns = Ns Sy 29 Po 512MB Pc Pq int
	Default limit for metaslab size.
	.
	.It Sy zfs_vdev_max_auto_ashift Ns = Ns Sy ASHIFT_MAX Po 16 Pc Pq ulong
	Maximum ashift used when optimizing for logical -> physical sector size on new
	top-level vdevs.
	.
	.It Sy zfs_vdev_min_auto_ashift Ns = Ns Sy ASHIFT_MIN Po 9 Pc Pq ulong
	Minimum ashift used when creating new top-level vdevs.
	.
	.It Sy zfs_vdev_min_ms_count Ns = Ns Sy 16 Pq int
	Minimum number of metaslabs to create in a top-level vdev.
	.
	.It Sy vdev_validate_skip Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Skip label validation steps during pool import.
	Changing is not recommended unless you know what you're doing
	and are recovering a damaged label.
	.
	.It Sy zfs_vdev_ms_count_limit Ns = Ns Sy 131072 Po 128k Pc Pq int
	Practical upper limit of total metaslabs per top-level vdev.
	.
	.It Sy metaslab_preload_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Enable metaslab group preloading.
	.
	.It Sy metaslab_lba_weighting_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Give more weight to metaslabs with lower LBAs,
	assuming they have greater bandwidth,
	as is typically the case on a modern constant angular velocity disk drive.
	.
	.It Sy metaslab_unload_delay Ns = Ns Sy 32 Pq int
	After a metaslab is used, we keep it loaded for this many TXGs, to attempt to
	reduce unnecessary reloading.
	Note that both this many TXGs and
	.Sy metaslab_unload_delay_ms
	milliseconds must pass before unloading will occur.
	.
	.It Sy metaslab_unload_delay_ms Ns = Ns Sy 600000 Ns ms Po 10min Pc Pq int
	After a metaslab is used, we keep it loaded for this many milliseconds,
	to attempt to reduce unnecessary reloading.
	Note, that both this many milliseconds and
	.Sy metaslab_unload_delay
	TXGs must pass before unloading will occur.
	.
	.It Sy reference_history Ns = Ns Sy 3 Pq int
	Maximum reference holders being tracked when reference_tracking_enable is active.
	.
	.It Sy reference_tracking_enable Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Track reference holders to
	.Sy refcount_t
	objects (debug builds only).
	.
	.It Sy send_holes_without_birth_time Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	When set, the
	.Sy hole_birth
	optimization will not be used, and all holes will always be sent during a
	.Nm zfs Cm send .
	This is useful if you suspect your datasets are affected by a bug in
	.Sy hole_birth .
	.
	.It Sy spa_config_path Ns = Ns Pa /etc/zfs/zpool.cache Pq charp
	SPA config file.
	.
	.It Sy spa_asize_inflation Ns = Ns Sy 24 Pq int
	Multiplication factor used to estimate actual disk consumption from the
	size of data being written.
	The default value is a worst case estimate,
	but lower values may be valid for a given pool depending on its configuration.
	Pool administrators who understand the factors involved
	may wish to specify a more realistic inflation factor,
	particularly if they operate close to quota or capacity limits.
	.
	.It Sy spa_load_print_vdev_tree Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Whether to print the vdev tree in the debugging message buffer during pool import.
	.
	.It Sy spa_load_verify_data Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Whether to traverse data blocks during an "extreme rewind"
	.Pq Fl X
	import.
	.Pp
	An extreme rewind import normally performs a full traversal of all
	blocks in the pool for verification.
	If this parameter is unset, the traversal skips non-metadata blocks.
	It can be toggled once the
	import has started to stop or start the traversal of non-metadata blocks.
	.
	.It Sy spa_load_verify_metadata Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Whether to traverse blocks during an "extreme rewind"
	.Pq Fl X
	pool import.
	.Pp
	An extreme rewind import normally performs a full traversal of all
	blocks in the pool for verification.
	If this parameter is unset, the traversal is not performed.
	It can be toggled once the import has started to stop or start the traversal.
	.
	.It Sy spa_load_verify_shift Ns = Ns Sy 4 Po 1/16th Pc Pq int
	Sets the maximum number of bytes to consume during pool import to the log2
	fraction of the target ARC size.
	.
	.It Sy spa_slop_shift Ns = Ns Sy 5 Po 1/32nd Pc Pq int
	Normally, we don't allow the last
	.Sy 3.2% Pq Sy 1/2^spa_slop_shift
	of space in the pool to be consumed.
	This ensures that we don't run the pool completely out of space,
	due to unaccounted changes (e.g. to the MOS).
	It also limits the worst-case time to allocate space.
	If we have less than this amount of free space,
	most ZPL operations (e.g. write, create) will return
	.Sy ENOSPC .
	.
	.It Sy vdev_removal_max_span Ns = Ns Sy 32768 Ns B Po 32kB Pc Pq int
	During top-level vdev removal, chunks of data are copied from the vdev
	which may include free space in order to trade bandwidth for IOPS.
	This parameter determines the maximum span of free space, in bytes,
	which will be included as "unnecessary" data in a chunk of copied data.
	.Pp
	The default value here was chosen to align with
	.Sy zfs_vdev_read_gap_limit ,
	which is a similar concept when doing
	regular reads (but there's no reason it has to be the same).
	.
	.It Sy vdev_file_logical_ashift Ns = Ns Sy 9 Po 512B Pc Pq ulong
	Logical ashift for file-based devices.
	.
	.It Sy vdev_file_physical_ashift Ns = Ns Sy 9 Po 512B Pc Pq ulong
	Physical ashift for file-based devices.
	.
	.It Sy zap_iterate_prefetch Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	If set, when we start iterating over a ZAP object,
	prefetch the entire object (all leaf blocks).
	However, this is limited by
	.Sy dmu_prefetch_max .
	.
	.It Sy zfetch_array_rd_sz Ns = Ns Sy 1048576 Ns B Po 1MB Pc Pq ulong
	If prefetching is enabled, disable prefetching for reads larger than this size.
	.
	.It Sy zfetch_max_distance Ns = Ns Sy 8388608 Ns B Po 8MB Pc Pq uint
	Max bytes to prefetch per stream.
	.
	.It Sy zfetch_max_idistance Ns = Ns Sy 67108864 Ns B Po 64MB Pc Pq uint
	Max bytes to prefetch indirects for per stream.
	.
	.It Sy zfetch_max_streams Ns = Ns Sy 8 Pq uint
	Max number of streams per zfetch (prefetch streams per file).
	.
	.It Sy zfetch_min_sec_reap Ns = Ns Sy 2 Pq uint
	Min time before an active prefetch stream can be reclaimed
	.
	.It Sy zfs_abd_scatter_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Enables ARC from using scatter/gather lists and forces all allocations to be
	linear in kernel memory.
	Disabling can improve performance in some code paths
	at the expense of fragmented kernel memory.
	.
	.It Sy zfs_abd_scatter_max_order Ns = Ns Sy MAX_ORDER-1 Pq uint
	Maximum number of consecutive memory pages allocated in a single block for
	scatter/gather lists.
	.Pp
	The value of
	.Sy MAX_ORDER
	depends on kernel configuration.
	.
	.It Sy zfs_abd_scatter_min_size Ns = Ns Sy 1536 Ns B Po 1.5kB Pc Pq uint
	This is the minimum allocation size that will use scatter (page-based) ABDs.
	Smaller allocations will use linear ABDs.
	.
	.It Sy zfs_arc_dnode_limit Ns = Ns Sy 0 Ns B Pq ulong
	When the number of bytes consumed by dnodes in the ARC exceeds this number of
	bytes, try to unpin some of it in response to demand for non-metadata.
	This value acts as a ceiling to the amount of dnode metadata, and defaults to
	.Sy 0 ,
	which indicates that a percent which is based on
	.Sy zfs_arc_dnode_limit_percent
	of the ARC meta buffers that may be used for dnodes.
	.Pp
	Also see
	.Sy zfs_arc_meta_prune
	which serves a similar purpose but is used
	when the amount of metadata in the ARC exceeds
	.Sy zfs_arc_meta_limit
	rather than in response to overall demand for non-metadata.
	.
	.It Sy zfs_arc_dnode_limit_percent Ns = Ns Sy 10 Ns % Pq ulong
	Percentage that can be consumed by dnodes of ARC meta buffers.
	.Pp
	See also
	.Sy zfs_arc_dnode_limit ,
	which serves a similar purpose but has a higher priority if nonzero.
	.
	.It Sy zfs_arc_dnode_reduce_percent Ns = Ns Sy 10 Ns % Pq ulong
	Percentage of ARC dnodes to try to scan in response to demand for non-metadata
	when the number of bytes consumed by dnodes exceeds
	.Sy zfs_arc_dnode_limit .
	.
	.It Sy zfs_arc_average_blocksize Ns = Ns Sy 8192 Ns B Po 8kB Pc Pq int
	The ARC's buffer hash table is sized based on the assumption of an average
	block size of this value.
	This works out to roughly 1MB of hash table per 1GB of physical memory
	with 8-byte pointers.
	For configurations with a known larger average block size,
	this value can be increased to reduce the memory footprint.
	.
	.It Sy zfs_arc_eviction_pct Ns = Ns Sy 200 Ns % Pq int
	When
	.Fn arc_is_overflowing ,
	.Fn arc_get_data_impl
	waits for this percent of the requested amount of data to be evicted.
	For example, by default, for every
	.Em 2kB
	that's evicted,
	.Em 1kB
	of it may be "reused" by a new allocation.
	Since this is above
	.Sy 100 Ns % ,
	it ensures that progress is made towards getting
	.Sy arc_size No under Sy arc_c .
	Since this is finite, it ensures that allocations can still happen,
	even during the potentially long time that
	.Sy arc_size No is more than Sy arc_c .
	.
	.It Sy zfs_arc_evict_batch_limit Ns = Ns Sy 10 Pq int
	Number ARC headers to evict per sub-list before proceeding to another sub-list.
	This batch-style operation prevents entire sub-lists from being evicted at once
	but comes at a cost of additional unlocking and locking.
	.
	.It Sy zfs_arc_grow_retry Ns = Ns Sy 0 Ns s Pq int
	If set to a non zero value, it will replace the
	.Sy arc_grow_retry
	value with this value.
	The
	.Sy arc_grow_retry
	.No value Pq default Sy 5 Ns s
	is the number of seconds the ARC will wait before
	trying to resume growth after a memory pressure event.
	.
	.It Sy zfs_arc_lotsfree_percent Ns = Ns Sy 10 Ns % Pq int
	Throttle I/O when free system memory drops below this percentage of total
	system memory.
	Setting this value to
	.Sy 0
	will disable the throttle.
	.
	.It Sy zfs_arc_max Ns = Ns Sy 0 Ns B Pq ulong
	Max size of ARC in bytes.
	If
	.Sy 0 ,
	then the max size of ARC is determined by the amount of system memory installed.
	Under Linux, half of system memory will be used as the limit.
	Under
	.Fx ,
	the larger of
	.Sy all_system_memory - 1GB No and Sy 5/8 * all_system_memory
	will be used as the limit.
	This value must be at least
	.Sy 67108864 Ns B Pq 64MB .
	.Pp
	This value can be changed dynamically, with some caveats.
	It cannot be set back to
	.Sy 0
	while running, and reducing it below the current ARC size will not cause
	the ARC to shrink without memory pressure to induce shrinking.
	.
	.It Sy zfs_arc_meta_adjust_restarts Ns = Ns Sy 4096 Pq ulong
	The number of restart passes to make while scanning the ARC attempting
	the free buffers in order to stay below the
	.Sy fs_arc_meta_limit .
	This value should not need to be tuned but is available to facilitate
	performance analysis.
	.
	.It Sy zfs_arc_meta_limit Ns = Ns Sy 0 Ns B Pq ulong
	The maximum allowed size in bytes that metadata buffers are allowed to
	consume in the ARC.
	When this limit is reached, metadata buffers will be reclaimed,
	even if the overall
	.Sy arc_c_max
	has not been reached.
	It defaults to
	.Sy 0 ,
	which indicates that a percentage based on
	.Sy zfs_arc_meta_limit_percent
	of the ARC may be used for metadata.
	.Pp
	This value my be changed dynamically, except that must be set to an explicit value
	.Pq cannot be set back to Sy 0 .
	.
	.It Sy zfs_arc_meta_limit_percent Ns = Ns Sy 75 Ns % Pq ulong
	Percentage of ARC buffers that can be used for metadata.
	.Pp
	See also
	.Sy zfs_arc_meta_limit ,
	which serves a similar purpose but has a higher priority if nonzero.
	.
	.It Sy zfs_arc_meta_min Ns = Ns Sy 0 Ns B Pq ulong
	The minimum allowed size in bytes that metadata buffers may consume in
	the ARC.
	.
	.It Sy zfs_arc_meta_prune Ns = Ns Sy 10000 Pq int
	The number of dentries and inodes to be scanned looking for entries
	which can be dropped.
	This may be required when the ARC reaches the
	.Sy zfs_arc_meta_limit
	because dentries and inodes can pin buffers in the ARC.
	Increasing this value will cause to dentry and inode caches
	to be pruned more aggressively.
	Setting this value to
	.Sy 0
	will disable pruning the inode and dentry caches.
	.
	.It Sy zfs_arc_meta_strategy Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Define the strategy for ARC metadata buffer eviction (meta reclaim strategy):
	.Bl -tag -compact -offset 4n -width "0 (META_ONLY)"
	.It Sy 0 Pq META_ONLY
	evict only the ARC metadata buffers
	.It Sy 1 Pq BALANCED
	additional data buffers may be evicted if required
	to evict the required number of metadata buffers.
	.El
	.
	.It Sy zfs_arc_min Ns = Ns Sy 0 Ns B Pq ulong
	Min size of ARC in bytes.
	.No If set to Sy 0 , arc_c_min
	will default to consuming the larger of
	.Sy 32MB No or Sy all_system_memory/32 .
	.
	.It Sy zfs_arc_min_prefetch_ms Ns = Ns Sy 0 Ns ms Ns Po Ns ≡ Ns 1s Pc Pq int
	Minimum time prefetched blocks are locked in the ARC.
	.
	.It Sy zfs_arc_min_prescient_prefetch_ms Ns = Ns Sy 0 Ns ms Ns Po Ns ≡ Ns 6s Pc Pq int
	Minimum time "prescient prefetched" blocks are locked in the ARC.
	These blocks are meant to be prefetched fairly aggressively ahead of
	the code that may use them.
	.
	.It Sy zfs_max_missing_tvds Ns = Ns Sy 0 Pq int
	Number of missing top-level vdevs which will be allowed during
	pool import (only in read-only mode).
	.
	.It Sy zfs_max_nvlist_src_size Ns = Sy 0 Pq ulong
	Maximum size in bytes allowed to be passed as
	.Sy zc_nvlist_src_size
	for ioctls on
	.Pa /dev/zfs .
	This prevents a user from causing the kernel to allocate
	an excessive amount of memory.
	When the limit is exceeded, the ioctl fails with
	.Sy EINVAL
	and a description of the error is sent to the
	.Pa zfs-dbgmsg
	log.
	This parameter should not need to be touched under normal circumstances.
	If
	.Sy 0 ,
	equivalent to a quarter of the user-wired memory limit under
	.Fx
	and to
	.Sy 134217728 Ns B Pq 128MB
	under Linux.
	.
	.It Sy zfs_multilist_num_sublists Ns = Ns Sy 0 Pq int
	To allow more fine-grained locking, each ARC state contains a series
	of lists for both data and metadata objects.
	Locking is performed at the level of these "sub-lists".
	This parameters controls the number of sub-lists per ARC state,
	and also applies to other uses of the multilist data structure.
	.Pp
	If
	.Sy 0 ,
	equivalent to the greater of the number of online CPUs and
	.Sy 4 .
	.
	.It Sy zfs_arc_overflow_shift Ns = Ns Sy 8 Pq int
	The ARC size is considered to be overflowing if it exceeds the current
	ARC target size
	.Pq Sy arc_c
	-by a threshold determined by this parameter.
	-The threshold is calculated as a fraction of
	-.Sy arc_c
	-using the formula
	-.Sy arc_c >> zfs_arc_overflow_shift .
	+by thresholds determined by this parameter.
	+Exceeding by
	+.Sy ( arc_c >> zfs_arc_overflow_shift ) * 0.5
	+starts ARC reclamation process.
	+If that appears insufficient, exceeding by
	+.Sy ( arc_c >> zfs_arc_overflow_shift ) * 1.5
	+blocks new buffer allocation until the reclaim thread catches up.
	+Started reclamation process continues till ARC size returns below the
	+target size.
	.Pp
	The default value of
	.Sy 8
	-causes the ARC to be considered overflowing if it exceeds the target size by
	-.Em 1/256th Pq Em 0.3%
	-of the target size.
	-.Pp
	-When the ARC is overflowing, new buffer allocations are stalled until
	-the reclaim thread catches up and the overflow condition no longer exists.
	+causes the ARC to start reclamation if it exceeds the target size by
	+.Em 0.2%
	+of the target size, and block allocations by
	+.Em 0.6% .
	.
	.It Sy zfs_arc_p_min_shift Ns = Ns Sy 0 Pq int
	If nonzero, this will update
	.Sy arc_p_min_shift Pq default Sy 4
	with the new value.
	.Sy arc_p_min_shift No is used as a shift of Sy arc_c
	when calculating the minumum
	.Sy arc_p No size.
	.
	.It Sy zfs_arc_p_dampener_disable Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Disable
	.Sy arc_p
	adapt dampener, which reduces the maximum single adjustment to
	.Sy arc_p .
	.
	.It Sy zfs_arc_shrink_shift Ns = Ns Sy 0 Pq int
	If nonzero, this will update
	.Sy arc_shrink_shift Pq default Sy 7
	with the new value.
	.
	.It Sy zfs_arc_pc_percent Ns = Ns Sy 0 Ns % Po off Pc Pq uint
	Percent of pagecache to reclaim ARC to.
	.Pp
	This tunable allows the ZFS ARC to play more nicely
	with the kernel's LRU pagecache.
	It can guarantee that the ARC size won't collapse under scanning
	pressure on the pagecache, yet still allows the ARC to be reclaimed down to
	.Sy zfs_arc_min
	if necessary.
	This value is specified as percent of pagecache size (as measured by
	.Sy NR_FILE_PAGES ) ,
	where that percent may exceed
	.Sy 100 .
	This
	only operates during memory pressure/reclaim.
	.
	.It Sy zfs_arc_shrinker_limit Ns = Ns Sy 10000 Pq int
	This is a limit on how many pages the ARC shrinker makes available for
	eviction in response to one page allocation attempt.
	Note that in practice, the kernel's shrinker can ask us to evict
	up to about four times this for one allocation attempt.
	.Pp
	The default limit of
	.Sy 10000 Pq in practice, Em 160MB No per allocation attempt with 4kB pages
	limits the amount of time spent attempting to reclaim ARC memory to
	less than 100ms per allocation attempt,
	even with a small average compressed block size of ~8kB.
	.Pp
	The parameter can be set to 0 (zero) to disable the limit,
	and only applies on Linux.
	.
	.It Sy zfs_arc_sys_free Ns = Ns Sy 0 Ns B Pq ulong
	The target number of bytes the ARC should leave as free memory on the system.
	If zero, equivalent to the bigger of
	.Sy 512kB No and Sy all_system_memory/64 .
	.
	.It Sy zfs_autoimport_disable Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Disable pool import at module load by ignoring the cache file
	.Pq Sy spa_config_path .
	.
	.It Sy zfs_checksum_events_per_second Ns = Ns Sy 20 Ns /s Pq uint
	Rate limit checksum events to this many per second.
	Note that this should not be set below the ZED thresholds
	(currently 10 checksums over 10 seconds)
	or else the daemon may not trigger any action.
	.
	.It Sy zfs_commit_timeout_pct Ns = Ns Sy 5 Ns % Pq int
	This controls the amount of time that a ZIL block (lwb) will remain "open"
	when it isn't "full", and it has a thread waiting for it to be committed to
	stable storage.
	The timeout is scaled based on a percentage of the last lwb
	latency to avoid significantly impacting the latency of each individual
	transaction record (itx).
	.
	.It Sy zfs_condense_indirect_commit_entry_delay_ms Ns = Ns Sy 0 Ns ms Pq int
	Vdev indirection layer (used for device removal) sleeps for this many
	milliseconds during mapping generation.
	Intended for use with the test suite to throttle vdev removal speed.
	.
	.It Sy zfs_condense_indirect_obsolete_pct Ns = Ns Sy 25 Ns % Pq int
	Minimum percent of obsolete bytes in vdev mapping required to attempt to condense
	.Pq see Sy zfs_condense_indirect_vdevs_enable .
	Intended for use with the test suite
	to facilitate triggering condensing as needed.
	.
	.It Sy zfs_condense_indirect_vdevs_enable Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Enable condensing indirect vdev mappings.
	When set, attempt to condense indirect vdev mappings
	if the mapping uses more than
	.Sy zfs_condense_min_mapping_bytes
	bytes of memory and if the obsolete space map object uses more than
	.Sy zfs_condense_max_obsolete_bytes
	bytes on-disk.
	The condensing process is an attempt to save memory by removing obsolete mappings.
	.
	.It Sy zfs_condense_max_obsolete_bytes Ns = Ns Sy 1073741824 Ns B Po 1GB Pc Pq ulong
	Only attempt to condense indirect vdev mappings if the on-disk size
	of the obsolete space map object is greater than this number of bytes
	.Pq see Sy zfs_condense_indirect_vdevs_enable .
	.
	.It Sy zfs_condense_min_mapping_bytes Ns = Ns Sy 131072 Ns B Po 128kB Pc Pq ulong
	Minimum size vdev mapping to attempt to condense
	.Pq see Sy zfs_condense_indirect_vdevs_enable .
	.
	.It Sy zfs_dbgmsg_enable Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Internally ZFS keeps a small log to facilitate debugging.
	The log is enabled by default, and can be disabled by unsetting this option.
	The contents of the log can be accessed by reading
	.Pa /proc/spl/kstat/zfs/dbgmsg .
	Writing
	.Sy 0
	to the file clears the log.
	.Pp
	This setting does not influence debug prints due to
	.Sy zfs_flags .
	.
	.It Sy zfs_dbgmsg_maxsize Ns = Ns Sy 4194304 Ns B Po 4MB Pc Pq int
	Maximum size of the internal ZFS debug log.
	.
	.It Sy zfs_dbuf_state_index Ns = Ns Sy 0 Pq int
	Historically used for controlling what reporting was available under
	.Pa /proc/spl/kstat/zfs .
	No effect.
	.
	.It Sy zfs_deadman_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	When a pool sync operation takes longer than
	.Sy zfs_deadman_synctime_ms ,
	or when an individual I/O operation takes longer than
	.Sy zfs_deadman_ziotime_ms ,
	then the operation is considered to be "hung".
	If
	.Sy zfs_deadman_enabled
	is set, then the deadman behavior is invoked as described by
	.Sy zfs_deadman_failmode .
	By default, the deadman is enabled and set to
	.Sy wait
	which results in "hung" I/Os only being logged.
	The deadman is automatically disabled when a pool gets suspended.
	.
	.It Sy zfs_deadman_failmode Ns = Ns Sy wait Pq charp
	Controls the failure behavior when the deadman detects a "hung" I/O operation.
	Valid values are:
	.Bl -tag -compact -offset 4n -width "continue"
	.It Sy wait
	Wait for a "hung" operation to complete.
	For each "hung" operation a "deadman" event will be posted
	describing that operation.
	.It Sy continue
	Attempt to recover from a "hung" operation by re-dispatching it
	to the I/O pipeline if possible.
	.It Sy panic
	Panic the system.
	This can be used to facilitate automatic fail-over
	to a properly configured fail-over partner.
	.El
	.
	.It Sy zfs_deadman_checktime_ms Ns = Ns Sy 60000 Ns ms Po 1min Pc Pq int
	Check time in milliseconds.
	This defines the frequency at which we check for hung I/O requests
	and potentially invoke the
	.Sy zfs_deadman_failmode
	behavior.
	.
	.It Sy zfs_deadman_synctime_ms Ns = Ns Sy 600000 Ns ms Po 10min Pc Pq ulong
	Interval in milliseconds after which the deadman is triggered and also
	the interval after which a pool sync operation is considered to be "hung".
	Once this limit is exceeded the deadman will be invoked every
	.Sy zfs_deadman_checktime_ms
	milliseconds until the pool sync completes.
	.
	.It Sy zfs_deadman_ziotime_ms Ns = Ns Sy 300000 Ns ms Po 5min Pc Pq ulong
	Interval in milliseconds after which the deadman is triggered and an
	individual I/O operation is considered to be "hung".
	As long as the operation remains "hung",
	the deadman will be invoked every
	.Sy zfs_deadman_checktime_ms
	milliseconds until the operation completes.
	.
	.It Sy zfs_dedup_prefetch Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Enable prefetching dedup-ed blocks which are going to be freed.
	.
	.It Sy zfs_delay_min_dirty_percent Ns = Ns Sy 60 Ns % Pq int
	Start to delay each transaction once there is this amount of dirty data,
	expressed as a percentage of
	.Sy zfs_dirty_data_max .
	This value should be at least
	.Sy zfs_vdev_async_write_active_max_dirty_percent .
	.No See Sx ZFS TRANSACTION DELAY .
	.
	.It Sy zfs_delay_scale Ns = Ns Sy 500000 Pq int
	This controls how quickly the transaction delay approaches infinity.
	Larger values cause longer delays for a given amount of dirty data.
	.Pp
	For the smoothest delay, this value should be about 1 billion divided
	by the maximum number of operations per second.
	This will smoothly handle between ten times and a tenth of this number.
	.No See Sx ZFS TRANSACTION DELAY .
	.Pp
	.Sy zfs_delay_scale * zfs_dirty_data_max Em must be smaller than Sy 2^64 .
	.
	.It Sy zfs_disable_ivset_guid_check Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Disables requirement for IVset GUIDs to be present and match when doing a raw
	receive of encrypted datasets.
	Intended for users whose pools were created with
	OpenZFS pre-release versions and now have compatibility issues.
	.
	.It Sy zfs_key_max_salt_uses Ns = Ns Sy 400000000 Po 4*10^8 Pc Pq ulong
	Maximum number of uses of a single salt value before generating a new one for
	encrypted datasets.
	The default value is also the maximum.
	.
	.It Sy zfs_object_mutex_size Ns = Ns Sy 64 Pq uint
	Size of the znode hashtable used for holds.
	.Pp
	Due to the need to hold locks on objects that may not exist yet, kernel mutexes
	are not created per-object and instead a hashtable is used where collisions
	will result in objects waiting when there is not actually contention on the
	same object.
	.
	.It Sy zfs_slow_io_events_per_second Ns = Ns Sy 20 Ns /s Pq int
	Rate limit delay and deadman zevents (which report slow I/Os) to this many per
	second.
	.
	.It Sy zfs_unflushed_max_mem_amt Ns = Ns Sy 1073741824 Ns B Po 1GB Pc Pq ulong
	Upper-bound limit for unflushed metadata changes to be held by the
	log spacemap in memory, in bytes.
	.
	.It Sy zfs_unflushed_max_mem_ppm Ns = Ns Sy 1000 Ns ppm Po 0.1% Pc Pq ulong
	Part of overall system memory that ZFS allows to be used
	for unflushed metadata changes by the log spacemap, in millionths.
	.
	.It Sy zfs_unflushed_log_block_max Ns = Ns Sy 262144 Po 256k Pc Pq ulong
	Describes the maximum number of log spacemap blocks allowed for each pool.
	The default value means that the space in all the log spacemaps
	can add up to no more than
	.Sy 262144
	blocks (which means
	.Em 32GB
	of logical space before compression and ditto blocks,
	assuming that blocksize is
	.Em 128kB ) .
	.Pp
	This tunable is important because it involves a trade-off between import
	time after an unclean export and the frequency of flushing metaslabs.
	The higher this number is, the more log blocks we allow when the pool is
	active which means that we flush metaslabs less often and thus decrease
	the number of I/Os for spacemap updates per TXG.
	At the same time though, that means that in the event of an unclean export,
	there will be more log spacemap blocks for us to read, inducing overhead
	in the import time of the pool.
	The lower the number, the amount of flushing increases, destroying log
	blocks quicker as they become obsolete faster, which leaves less blocks
	to be read during import time after a crash.
	.Pp
	Each log spacemap block existing during pool import leads to approximately
	one extra logical I/O issued.
	This is the reason why this tunable is exposed in terms of blocks rather
	than space used.
	.
	.It Sy zfs_unflushed_log_block_min Ns = Ns Sy 1000 Pq ulong
	If the number of metaslabs is small and our incoming rate is high,
	we could get into a situation that we are flushing all our metaslabs every TXG.
	Thus we always allow at least this many log blocks.
	.
	.It Sy zfs_unflushed_log_block_pct Ns = Ns Sy 400 Ns % Pq ulong
	Tunable used to determine the number of blocks that can be used for
	the spacemap log, expressed as a percentage of the total number of
	metaslabs in the pool.
	.
	.It Sy zfs_unlink_suspend_progress Ns = Ns Sy 0 Ns \| Ns 1 Pq uint
	When enabled, files will not be asynchronously removed from the list of pending
	unlinks and the space they consume will be leaked.
	Once this option has been disabled and the dataset is remounted,
	the pending unlinks will be processed and the freed space returned to the pool.
	This option is used by the test suite.
	.
	.It Sy zfs_delete_blocks Ns = Ns Sy 20480 Pq ulong
	This is the used to define a large file for the purposes of deletion.
	Files containing more than
	.Sy zfs_delete_blocks
	will be deleted asynchronously, while smaller files are deleted synchronously.
	Decreasing this value will reduce the time spent in an
	.Xr unlink 2
	system call, at the expense of a longer delay before the freed space is available.
	.
	.It Sy zfs_dirty_data_max Ns = Pq int
	Determines the dirty space limit in bytes.
	Once this limit is exceeded, new writes are halted until space frees up.
	This parameter takes precedence over
	.Sy zfs_dirty_data_max_percent .
	.No See Sx ZFS TRANSACTION DELAY .
	.Pp
	Defaults to
	.Sy physical_ram/10 ,
	capped at
	.Sy zfs_dirty_data_max_max .
	.
	.It Sy zfs_dirty_data_max_max Ns = Pq int
	Maximum allowable value of
	.Sy zfs_dirty_data_max ,
	expressed in bytes.
	This limit is only enforced at module load time, and will be ignored if
	.Sy zfs_dirty_data_max
	is later changed.
	This parameter takes precedence over
	.Sy zfs_dirty_data_max_max_percent .
	.No See Sx ZFS TRANSACTION DELAY .
	.Pp
	Defaults to
	.Sy physical_ram/4 ,
	.
	.It Sy zfs_dirty_data_max_max_percent Ns = Ns Sy 25 Ns % Pq int
	Maximum allowable value of
	.Sy zfs_dirty_data_max ,
	expressed as a percentage of physical RAM.
	This limit is only enforced at module load time, and will be ignored if
	.Sy zfs_dirty_data_max
	is later changed.
	The parameter
	.Sy zfs_dirty_data_max_max
	takes precedence over this one.
	.No See Sx ZFS TRANSACTION DELAY .
	.
	.It Sy zfs_dirty_data_max_percent Ns = Ns Sy 10 Ns % Pq int
	Determines the dirty space limit, expressed as a percentage of all memory.
	Once this limit is exceeded, new writes are halted until space frees up.
	The parameter
	.Sy zfs_dirty_data_max
	takes precedence over this one.
	.No See Sx ZFS TRANSACTION DELAY .
	.Pp
	Subject to
	.Sy zfs_dirty_data_max_max .
	.
	.It Sy zfs_dirty_data_sync_percent Ns = Ns Sy 20 Ns % Pq int
	Start syncing out a transaction group if there's at least this much dirty data
	.Pq as a percentage of Sy zfs_dirty_data_max .
	This should be less than
	.Sy zfs_vdev_async_write_active_min_dirty_percent .
	.
	.It Sy zfs_fallocate_reserve_percent Ns = Ns Sy 110 Ns % Pq uint
	Since ZFS is a copy-on-write filesystem with snapshots, blocks cannot be
	preallocated for a file in order to guarantee that later writes will not
	run out of space.
	Instead,
	.Xr fallocate 2
	space preallocation only checks that sufficient space is currently available
	in the pool or the user's project quota allocation,
	and then creates a sparse file of the requested size.
	The requested space is multiplied by
	.Sy zfs_fallocate_reserve_percent
	to allow additional space for indirect blocks and other internal metadata.
	Setting this to
	.Sy 0
	disables support for
	.Xr fallocate 2
	and causes it to return
	.Sy EOPNOTSUPP .
	.
	.It Sy zfs_fletcher_4_impl Ns = Ns Sy fastest Pq string
	Select a fletcher 4 implementation.
	.Pp
	Supported selectors are:
	.Sy fastest , scalar , sse2 , ssse3 , avx2 , avx512f , avx512bw ,
	.No and Sy aarch64_neon .
	All except
	.Sy fastest No and Sy scalar
	require instruction set extensions to be available,
	and will only appear if ZFS detects that they are present at runtime.
	If multiple implementations of fletcher 4 are available, the
	.Sy fastest
	will be chosen using a micro benchmark.
	Selecting
	.Sy scalar
	results in the original CPU-based calculation being used.
	Selecting any option other than
	.Sy fastest No or Sy scalar
	results in vector instructions
	from the respective CPU instruction set being used.
	.
	.It Sy zfs_free_bpobj_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Enable/disable the processing of the free_bpobj object.
	.
	.It Sy zfs_async_block_max_blocks Ns = Ns Sy ULONG_MAX Po unlimited Pc Pq ulong
	Maximum number of blocks freed in a single TXG.
	.
	.It Sy zfs_max_async_dedup_frees Ns = Ns Sy 100000 Po 10^5 Pc Pq ulong
	Maximum number of dedup blocks freed in a single TXG.
	.
	.It Sy zfs_override_estimate_recordsize Ns = Ns Sy 0 Pq ulong
	If nonzer, override record size calculation for
	.Nm zfs Cm send
	estimates.
	.
	.It Sy zfs_vdev_async_read_max_active Ns = Ns Sy 3 Pq int
	Maximum asynchronous read I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_async_read_min_active Ns = Ns Sy 1 Pq int
	Minimum asynchronous read I/O operation active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_async_write_active_max_dirty_percent Ns = Ns Sy 60 Ns % Pq int
	When the pool has more than this much dirty data, use
	.Sy zfs_vdev_async_write_max_active
	to limit active async writes.
	If the dirty data is between the minimum and maximum,
	the active I/O limit is linearly interpolated.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_async_write_active_min_dirty_percent Ns = Ns Sy 30 Ns % Pq int
	When the pool has less than this much dirty data, use
	.Sy zfs_vdev_async_write_min_active
	to limit active async writes.
	If the dirty data is between the minimum and maximum,
	the active I/O limit is linearly
	interpolated.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_async_write_max_active Ns = Ns Sy 30 Pq int
	Maximum asynchronous write I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_async_write_min_active Ns = Ns Sy 2 Pq int
	Minimum asynchronous write I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.Pp
	Lower values are associated with better latency on rotational media but poorer
	resilver performance.
	The default value of
	.Sy 2
	was chosen as a compromise.
	A value of
	.Sy 3
	has been shown to improve resilver performance further at a cost of
	further increasing latency.
	.
	.It Sy zfs_vdev_initializing_max_active Ns = Ns Sy 1 Pq int
	Maximum initializing I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_initializing_min_active Ns = Ns Sy 1 Pq int
	Minimum initializing I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_max_active Ns = Ns Sy 1000 Pq int
	The maximum number of I/O operations active to each device.
	Ideally, this will be at least the sum of each queue's
	.Sy max_active .
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_rebuild_max_active Ns = Ns Sy 3 Pq int
	Maximum sequential resilver I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_rebuild_min_active Ns = Ns Sy 1 Pq int
	Minimum sequential resilver I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_removal_max_active Ns = Ns Sy 2 Pq int
	Maximum removal I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_removal_min_active Ns = Ns Sy 1 Pq int
	Minimum removal I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_scrub_max_active Ns = Ns Sy 2 Pq int
	Maximum scrub I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_scrub_min_active Ns = Ns Sy 1 Pq int
	Minimum scrub I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_sync_read_max_active Ns = Ns Sy 10 Pq int
	Maximum synchronous read I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_sync_read_min_active Ns = Ns Sy 10 Pq int
	Minimum synchronous read I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_sync_write_max_active Ns = Ns Sy 10 Pq int
	Maximum synchronous write I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_sync_write_min_active Ns = Ns Sy 10 Pq int
	Minimum synchronous write I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_trim_max_active Ns = Ns Sy 2 Pq int
	Maximum trim/discard I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_trim_min_active Ns = Ns Sy 1 Pq int
	Minimum trim/discard I/O operations active to each device.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_nia_delay Ns = Ns Sy 5 Pq int
	For non-interactive I/O (scrub, resilver, removal, initialize and rebuild),
	the number of concurrently-active I/O operations is limited to
	.Sy zfs_*_min_active ,
	unless the vdev is "idle".
	When there are no interactive I/O operatinons active (synchronous or otherwise),
	and
	.Sy zfs_vdev_nia_delay
	operations have completed since the last interactive operation,
	then the vdev is considered to be "idle",
	and the number of concurrently-active non-interactive operations is increased to
	.Sy zfs_*_max_active .
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_nia_credit Ns = Ns Sy 5 Pq int
	Some HDDs tend to prioritize sequential I/O so strongly, that concurrent
	random I/O latency reaches several seconds.
	On some HDDs this happens even if sequential I/O operations
	are submitted one at a time, and so setting
	.Sy zfs_*_max_active Ns = Sy 1
	does not help.
	To prevent non-interactive I/O, like scrub,
	from monopolizing the device, no more than
	.Sy zfs_vdev_nia_credit operations can be sent
	while there are outstanding incomplete interactive operations.
	This enforced wait ensures the HDD services the interactive I/O
	within a reasonable amount of time.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_queue_depth_pct Ns = Ns Sy 1000 Ns % Pq int
	Maximum number of queued allocations per top-level vdev expressed as
	a percentage of
	.Sy zfs_vdev_async_write_max_active ,
	which allows the system to detect devices that are more capable
	of handling allocations and to allocate more blocks to those devices.
	This allows for dynamic allocation distribution when devices are imbalanced,
	as fuller devices will tend to be slower than empty devices.
	.Pp
	Also see
	.Sy zio_dva_throttle_enabled .
	.
	.It Sy zfs_expire_snapshot Ns = Ns Sy 300 Ns s Pq int
	Time before expiring
	.Pa .zfs/snapshot .
	.
	.It Sy zfs_admin_snapshot Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Allow the creation, removal, or renaming of entries in the
	.Sy .zfs/snapshot
	directory to cause the creation, destruction, or renaming of snapshots.
	When enabled, this functionality works both locally and over NFS exports
	which have the
	.Em no_root_squash
	option set.
	.
	.It Sy zfs_flags Ns = Ns Sy 0 Pq int
	Set additional debugging flags.
	The following flags may be bitwise-ored together:
	.TS
	box;
	lbz r l l .
	Value Symbolic Name Description
	_
	1 ZFS_DEBUG_DPRINTF Enable dprintf entries in the debug log.
	* 2 ZFS_DEBUG_DBUF_VERIFY Enable extra dbuf verifications.
	* 4 ZFS_DEBUG_DNODE_VERIFY Enable extra dnode verifications.
	8 ZFS_DEBUG_SNAPNAMES Enable snapshot name verification.
	16 ZFS_DEBUG_MODIFY Check for illegally modified ARC buffers.
	64 ZFS_DEBUG_ZIO_FREE Enable verification of block frees.
	128 ZFS_DEBUG_HISTOGRAM_VERIFY Enable extra spacemap histogram verifications.
	256 ZFS_DEBUG_METASLAB_VERIFY Verify space accounting on disk matches in-memory \fBrange_trees\fP.
	512 ZFS_DEBUG_SET_ERROR Enable \fBSET_ERROR\fP and dprintf entries in the debug log.
	1024 ZFS_DEBUG_INDIRECT_REMAP Verify split blocks created by device removal.
	2048 ZFS_DEBUG_TRIM Verify TRIM ranges are always within the allocatable range tree.
	4096 ZFS_DEBUG_LOG_SPACEMAP Verify that the log summary is consistent with the spacemap log
	and enable \fBzfs_dbgmsgs\fP for metaslab loading and flushing.
	.TE
	.Sy \& * No Requires debug build.
	.
	.It Sy zfs_free_leak_on_eio Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	If destroy encounters an
	.Sy EIO
	while reading metadata (e.g. indirect blocks),
	space referenced by the missing metadata can not be freed.
	Normally this causes the background destroy to become "stalled",
	as it is unable to make forward progress.
	While in this stalled state, all remaining space to free
	from the error-encountering filesystem is "temporarily leaked".
	Set this flag to cause it to ignore the
	.Sy EIO ,
	permanently leak the space from indirect blocks that can not be read,
	and continue to free everything else that it can.
	.Pp
	The default "stalling" behavior is useful if the storage partially
	fails (i.e. some but not all I/O operations fail), and then later recovers.
	In this case, we will be able to continue pool operations while it is
	partially failed, and when it recovers, we can continue to free the
	space, with no leaks.
	Note, however, that this case is actually fairly rare.
	.Pp
	Typically pools either
	.Bl -enum -compact -offset 4n -width "1."
	.It
	fail completely (but perhaps temporarily,
	e.g. due to a top-level vdev going offline), or
	.It
	have localized, permanent errors (e.g. disk returns the wrong data
	due to bit flip or firmware bug).
	.El
	In the former case, this setting does not matter because the
	pool will be suspended and the sync thread will not be able to make
	forward progress regardless.
	In the latter, because the error is permanent, the best we can do
	is leak the minimum amount of space,
	which is what setting this flag will do.
	It is therefore reasonable for this flag to normally be set,
	but we chose the more conservative approach of not setting it,
	so that there is no possibility of
	leaking space in the "partial temporary" failure case.
	.
	.It Sy zfs_free_min_time_ms Ns = Ns Sy 1000 Ns ms Po 1s Pc Pq int
	During a
	.Nm zfs Cm destroy
	operation using the
	.Sy async_destroy
	feature,
	a minimum of this much time will be spent working on freeing blocks per TXG.
	.
	.It Sy zfs_obsolete_min_time_ms Ns = Ns Sy 500 Ns ms Pq int
	Similar to
	.Sy zfs_free_min_time_ms ,
	but for cleanup of old indirection records for removed vdevs.
	.
	.It Sy zfs_immediate_write_sz Ns = Ns Sy 32768 Ns B Po 32kB Pc Pq long
	Largest data block to write to the ZIL.
	Larger blocks will be treated as if the dataset being written to had the
	.Sy logbias Ns = Ns Sy throughput
	property set.
	.
	.It Sy zfs_initialize_value Ns = Ns Sy 16045690984833335022 Po 0xDEADBEEFDEADBEEE Pc Pq ulong
	Pattern written to vdev free space by
	.Xr zpool-initialize 8 .
	.
	.It Sy zfs_initialize_chunk_size Ns = Ns Sy 1048576 Ns B Po 1MB Pc Pq ulong
	Size of writes used by
	.Xr zpool-initialize 8 .
	This option is used by the test suite.
	.
	.It Sy zfs_livelist_max_entries Ns = Ns Sy 500000 Po 5*10^5 Pc Pq ulong
	The threshold size (in block pointers) at which we create a new sub-livelist.
	Larger sublists are more costly from a memory perspective but the fewer
	sublists there are, the lower the cost of insertion.
	.
	.It Sy zfs_livelist_min_percent_shared Ns = Ns Sy 75 Ns % Pq int
	If the amount of shared space between a snapshot and its clone drops below
	this threshold, the clone turns off the livelist and reverts to the old
	deletion method.
	This is in place because livelists no long give us a benefit
	once a clone has been overwritten enough.
	.
	.It Sy zfs_livelist_condense_new_alloc Ns = Ns Sy 0 Pq int
	Incremented each time an extra ALLOC blkptr is added to a livelist entry while
	it is being condensed.
	This option is used by the test suite to track race conditions.
	.
	.It Sy zfs_livelist_condense_sync_cancel Ns = Ns Sy 0 Pq int
	Incremented each time livelist condensing is canceled while in
	.Fn spa_livelist_condense_sync .
	This option is used by the test suite to track race conditions.
	.
	.It Sy zfs_livelist_condense_sync_pause Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	When set, the livelist condense process pauses indefinitely before
	executing the synctask -
	.Fn spa_livelist_condense_sync .
	This option is used by the test suite to trigger race conditions.
	.
	.It Sy zfs_livelist_condense_zthr_cancel Ns = Ns Sy 0 Pq int
	Incremented each time livelist condensing is canceled while in
	.Fn spa_livelist_condense_cb .
	This option is used by the test suite to track race conditions.
	.
	.It Sy zfs_livelist_condense_zthr_pause Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	When set, the livelist condense process pauses indefinitely before
	executing the open context condensing work in
	.Fn spa_livelist_condense_cb .
	This option is used by the test suite to trigger race conditions.
	.
	.It Sy zfs_lua_max_instrlimit Ns = Ns Sy 100000000 Po 10^8 Pc Pq ulong
	The maximum execution time limit that can be set for a ZFS channel program,
	specified as a number of Lua instructions.
	.
	.It Sy zfs_lua_max_memlimit Ns = Ns Sy 104857600 Po 100MB Pc Pq ulong
	The maximum memory limit that can be set for a ZFS channel program, specified
	in bytes.
	.
	.It Sy zfs_max_dataset_nesting Ns = Ns Sy 50 Pq int
	The maximum depth of nested datasets.
	This value can be tuned temporarily to
	fix existing datasets that exceed the predefined limit.
	.
	.It Sy zfs_max_log_walking Ns = Ns Sy 5 Pq ulong
	The number of past TXGs that the flushing algorithm of the log spacemap
	feature uses to estimate incoming log blocks.
	.
	.It Sy zfs_max_logsm_summary_length Ns = Ns Sy 10 Pq ulong
	Maximum number of rows allowed in the summary of the spacemap log.
	.
	.It Sy zfs_max_recordsize Ns = Ns Sy 1048576 Po 1MB Pc Pq int
	We currently support block sizes from
	.Em 512B No to Em 16MB .
	The benefits of larger blocks, and thus larger I/O,
	need to be weighed against the cost of COWing a giant block to modify one byte.
	Additionally, very large blocks can have an impact on I/O latency,
	and also potentially on the memory allocator.
	Therefore, we do not allow the recordsize to be set larger than this tunable.
	Larger blocks can be created by changing it,
	and pools with larger blocks can always be imported and used,
	regardless of this setting.
	.
	.It Sy zfs_allow_redacted_dataset_mount Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Allow datasets received with redacted send/receive to be mounted.
	Normally disabled because these datasets may be missing key data.
	.
	.It Sy zfs_min_metaslabs_to_flush Ns = Ns Sy 1 Pq ulong
	Minimum number of metaslabs to flush per dirty TXG.
	.
	.It Sy zfs_metaslab_fragmentation_threshold Ns = Ns Sy 70 Ns % Pq int
	Allow metaslabs to keep their active state as long as their fragmentation
	percentage is no more than this value.
	An active metaslab that exceeds this threshold
	will no longer keep its active status allowing better metaslabs to be selected.
	.
	.It Sy zfs_mg_fragmentation_threshold Ns = Ns Sy 95 Ns % Pq int
	Metaslab groups are considered eligible for allocations if their
	fragmentation metric (measured as a percentage) is less than or equal to
	this value.
	If a metaslab group exceeds this threshold then it will be
	skipped unless all metaslab groups within the metaslab class have also
	crossed this threshold.
	.
	.It Sy zfs_mg_noalloc_threshold Ns = Ns Sy 0 Ns % Pq int
	Defines a threshold at which metaslab groups should be eligible for allocations.
	The value is expressed as a percentage of free space
	beyond which a metaslab group is always eligible for allocations.
	If a metaslab group's free space is less than or equal to the
	threshold, the allocator will avoid allocating to that group
	unless all groups in the pool have reached the threshold.
	Once all groups have reached the threshold, all groups are allowed to accept
	allocations.
	The default value of
	.Sy 0
	disables the feature and causes all metaslab groups to be eligible for allocations.
	.Pp
	This parameter allows one to deal with pools having heavily imbalanced
	vdevs such as would be the case when a new vdev has been added.
	Setting the threshold to a non-zero percentage will stop allocations
	from being made to vdevs that aren't filled to the specified percentage
	and allow lesser filled vdevs to acquire more allocations than they
	otherwise would under the old
	.Sy zfs_mg_alloc_failures
	facility.
	.
	.It Sy zfs_ddt_data_is_special Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	If enabled, ZFS will place DDT data into the special allocation class.
	.
	.It Sy zfs_user_indirect_is_special Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	If enabled, ZFS will place user data indirect blocks
	into the special allocation class.
	.
	.It Sy zfs_multihost_history Ns = Ns Sy 0 Pq int
	Historical statistics for this many latest multihost updates will be available in
	.Pa /proc/spl/kstat/zfs/ Ns Ao Ar pool Ac Ns Pa /multihost .
	.
	.It Sy zfs_multihost_interval Ns = Ns Sy 1000 Ns ms Po 1s Pc Pq ulong
	Used to control the frequency of multihost writes which are performed when the
	.Sy multihost
	pool property is on.
	This is one of the factors used to determine the
	length of the activity check during import.
	.Pp
	The multihost write period is
	.Sy zfs_multihost_interval / leaf-vdevs .
	On average a multihost write will be issued for each leaf vdev
	every
	.Sy zfs_multihost_interval
	milliseconds.
	In practice, the observed period can vary with the I/O load
	and this observed value is the delay which is stored in the uberblock.
	.
	.It Sy zfs_multihost_import_intervals Ns = Ns Sy 20 Pq uint
	Used to control the duration of the activity test on import.
	Smaller values of
	.Sy zfs_multihost_import_intervals
	will reduce the import time but increase
	the risk of failing to detect an active pool.
	The total activity check time is never allowed to drop below one second.
	.Pp
	On import the activity check waits a minimum amount of time determined by
	.Sy zfs_multihost_interval * zfs_multihost_import_intervals ,
	or the same product computed on the host which last had the pool imported,
	whichever is greater.
	The activity check time may be further extended if the value of MMP
	delay found in the best uberblock indicates actual multihost updates happened
	at longer intervals than
	.Sy zfs_multihost_interval .
	A minimum of
	.Em 100ms
	is enforced.
	.Pp
	.Sy 0 No is equivalent to Sy 1 .
	.
	.It Sy zfs_multihost_fail_intervals Ns = Ns Sy 10 Pq uint
	Controls the behavior of the pool when multihost write failures or delays are
	detected.
	.Pp
	When
	.Sy 0 ,
	multihost write failures or delays are ignored.
	The failures will still be reported to the ZED which depending on
	its configuration may take action such as suspending the pool or offlining a
	device.
	.Pp
	Otherwise, the pool will be suspended if
	.Sy zfs_multihost_fail_intervals * zfs_multihost_interval
	milliseconds pass without a successful MMP write.
	This guarantees the activity test will see MMP writes if the pool is imported.
	.Sy 1 No is equivalent to Sy 2 ;
	this is necessary to prevent the pool from being suspended
	due to normal, small I/O latency variations.
	.
	.It Sy zfs_no_scrub_io Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Set to disable scrub I/O.
	This results in scrubs not actually scrubbing data and
	simply doing a metadata crawl of the pool instead.
	.
	.It Sy zfs_no_scrub_prefetch Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Set to disable block prefetching for scrubs.
	.
	.It Sy zfs_nocacheflush Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Disable cache flush operations on disks when writing.
	Setting this will cause pool corruption on power loss
	if a volatile out-of-order write cache is enabled.
	.
	.It Sy zfs_nopwrite_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Allow no-operation writes.
	The occurrence of nopwrites will further depend on other pool properties
	.Pq i.a. the checksumming and compression algorithms .
	.
	.It Sy zfs_dmu_offset_next_sync Ns = Ns Sy 0 Ns \| ns 1 Pq int
	Enable forcing TXG sync to find holes.
	When enabled forces ZFS to act like prior versions when
	.Sy SEEK_HOLE No or Sy SEEK_DATA
	flags are used, which, when a dnode is dirty,
	causes TXGs to be synced so that this data can be found.
	.
	.It Sy zfs_pd_bytes_max Ns = Ns Sy 52428800 Ns B Po 50MB Pc Pq int
	The number of bytes which should be prefetched during a pool traversal, like
	.Nm zfs Cm send
	or other data crawling operations.
	.
	.It Sy zfs_traverse_indirect_prefetch_limit Ns = Ns Sy 32 Pq int
	The number of blocks pointed by indirect (non-L0) block which should be
	prefetched during a pool traversal, like
	.Nm zfs Cm send
	or other data crawling operations.
	.
	.It Sy zfs_per_txg_dirty_frees_percent Ns = Ns Sy 5 Ns % Pq ulong
	Control percentage of dirtied indirect blocks from frees allowed into one TXG.
	After this threshold is crossed, additional frees will wait until the next TXG.
	.Sy 0 No disables this throttle.
	.
	.It Sy zfs_prefetch_disable Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Disable predictive prefetch.
	Note that it leaves "prescient" prefetch (for. e.g.\&
	.Nm zfs Cm send )
	intact.
	Unlike predictive prefetch, prescient prefetch never issues I/O
	that ends up not being needed, so it can't hurt performance.
	.
	.It Sy zfs_qat_checksum_disable Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Disable QAT hardware acceleration for SHA256 checksums.
	May be unset after the ZFS modules have been loaded to initialize the QAT
	hardware as long as support is compiled in and the QAT driver is present.
	.
	.It Sy zfs_qat_compress_disable Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Disable QAT hardware acceleration for gzip compression.
	May be unset after the ZFS modules have been loaded to initialize the QAT
	hardware as long as support is compiled in and the QAT driver is present.
	.
	.It Sy zfs_qat_encrypt_disable Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Disable QAT hardware acceleration for AES-GCM encryption.
	May be unset after the ZFS modules have been loaded to initialize the QAT
	hardware as long as support is compiled in and the QAT driver is present.
	.
	.It Sy zfs_vnops_read_chunk_size Ns = Ns Sy 1048576 Ns B Po 1MB Pc Pq long
	Bytes to read per chunk.
	.
	.It Sy zfs_read_history Ns = Ns Sy 0 Pq int
	Historical statistics for this many latest reads will be available in
	.Pa /proc/spl/kstat/zfs/ Ns Ao Ar pool Ac Ns Pa /reads .
	.
	.It Sy zfs_read_history_hits Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Include cache hits in read history
	.
	.It Sy zfs_rebuild_max_segment Ns = Ns Sy 1048576 Ns B Po 1MB Pc Pq ulong
	Maximum read segment size to issue when sequentially resilvering a
	top-level vdev.
	.
	.It Sy zfs_rebuild_scrub_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Automatically start a pool scrub when the last active sequential resilver
	completes in order to verify the checksums of all blocks which have been
	resilvered.
	This is enabled by default and strongly recommended.
	.
	.It Sy zfs_rebuild_vdev_limit Ns = Ns Sy 33554432 Ns B Po 32MB Pc Pq ulong
	Maximum amount of I/O that can be concurrently issued for a sequential
	resilver per leaf device, given in bytes.
	.
	.It Sy zfs_reconstruct_indirect_combinations_max Ns = Ns Sy 4096 Pq int
	If an indirect split block contains more than this many possible unique
	combinations when being reconstructed, consider it too computationally
	expensive to check them all.
	Instead, try at most this many randomly selected
	combinations each time the block is accessed.
	This allows all segment copies to participate fairly
	in the reconstruction when all combinations
	cannot be checked and prevents repeated use of one bad copy.
	.
	.It Sy zfs_recover Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Set to attempt to recover from fatal errors.
	This should only be used as a last resort,
	as it typically results in leaked space, or worse.
	.
	.It Sy zfs_removal_ignore_errors Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Ignore hard IO errors during device removal.
	When set, if a device encounters a hard IO error during the removal process
	the removal will not be cancelled.
	This can result in a normally recoverable block becoming permanently damaged
	and is hence not recommended.
	This should only be used as a last resort when the
	pool cannot be returned to a healthy state prior to removing the device.
	.
	.It Sy zfs_removal_suspend_progress Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	This is used by the test suite so that it can ensure that certain actions
	happen while in the middle of a removal.
	.
	.It Sy zfs_remove_max_segment Ns = Ns Sy 16777216 Ns B Po 16MB Pc Pq int
	The largest contiguous segment that we will attempt to allocate when removing
	a device.
	If there is a performance problem with attempting to allocate large blocks,
	consider decreasing this.
	The default value is also the maximum.
	.
	.It Sy zfs_resilver_disable_defer Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Ignore the
	.Sy resilver_defer
	feature, causing an operation that would start a resilver to
	immediately restart the one in progress.
	.
	.It Sy zfs_resilver_min_time_ms Ns = Ns Sy 3000 Ns ms Po 3s Pc Pq int
	Resilvers are processed by the sync thread.
	While resilvering, it will spend at least this much time
	working on a resilver between TXG flushes.
	.
	.It Sy zfs_scan_ignore_errors Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	If set, remove the DTL (dirty time list) upon completion of a pool scan (scrub),
	even if there were unrepairable errors.
	Intended to be used during pool repair or recovery to
	stop resilvering when the pool is next imported.
	.
	.It Sy zfs_scrub_min_time_ms Ns = Ns Sy 1000 Ns ms Po 1s Pc Pq int
	Scrubs are processed by the sync thread.
	While scrubbing, it will spend at least this much time
	working on a scrub between TXG flushes.
	.
	.It Sy zfs_scan_checkpoint_intval Ns = Ns Sy 7200 Ns s Po 2h Pc Pq int
	To preserve progress across reboots, the sequential scan algorithm periodically
	needs to stop metadata scanning and issue all the verification I/O to disk.
	The frequency of this flushing is determined by this tunable.
	.
	.It Sy zfs_scan_fill_weight Ns = Ns Sy 3 Pq int
	This tunable affects how scrub and resilver I/O segments are ordered.
	A higher number indicates that we care more about how filled in a segment is,
	while a lower number indicates we care more about the size of the extent without
	considering the gaps within a segment.
	This value is only tunable upon module insertion.
	Changing the value afterwards will have no affect on scrub or resilver performance.
	.
	.It Sy zfs_scan_issue_strategy Ns = Ns Sy 0 Pq int
	Determines the order that data will be verified while scrubbing or resilvering:
	.Bl -tag -compact -offset 4n -width "a"
	.It Sy 1
	Data will be verified as sequentially as possible, given the
	amount of memory reserved for scrubbing
	.Pq see Sy zfs_scan_mem_lim_fact .
	This may improve scrub performance if the pool's data is very fragmented.
	.It Sy 2
	The largest mostly-contiguous chunk of found data will be verified first.
	By deferring scrubbing of small segments, we may later find adjacent data
	to coalesce and increase the segment size.
	.It Sy 0
	.No Use strategy Sy 1 No during normal verification
	.No and strategy Sy 2 No while taking a checkpoint.
	.El
	.
	.It Sy zfs_scan_legacy Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	If unset, indicates that scrubs and resilvers will gather metadata in
	memory before issuing sequential I/O.
	Otherwise indicates that the legacy algorithm will be used,
	where I/O is initiated as soon as it is discovered.
	Unsetting will not affect scrubs or resilvers that are already in progress.
	.
	.It Sy zfs_scan_max_ext_gap Ns = Ns Sy 2097152 Ns B Po 2MB Pc Pq int
	Sets the largest gap in bytes between scrub/resilver I/O operations
	that will still be considered sequential for sorting purposes.
	Changing this value will not
	affect scrubs or resilvers that are already in progress.
	.
	.It Sy zfs_scan_mem_lim_fact Ns = Ns Sy 20 Ns ^-1 Pq int
	Maximum fraction of RAM used for I/O sorting by sequential scan algorithm.
	This tunable determines the hard limit for I/O sorting memory usage.
	When the hard limit is reached we stop scanning metadata and start issuing
	data verification I/O.
	This is done until we get below the soft limit.
	.
	.It Sy zfs_scan_mem_lim_soft_fact Ns = Ns Sy 20 Ns ^-1 Pq int
	The fraction of the hard limit used to determined the soft limit for I/O sorting
	by the sequential scan algorithm.
	When we cross this limit from below no action is taken.
	When we cross this limit from above it is because we are issuing verification I/O.
	In this case (unless the metadata scan is done) we stop issuing verification I/O
	and start scanning metadata again until we get to the hard limit.
	.
	.It Sy zfs_scan_strict_mem_lim Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Enforce tight memory limits on pool scans when a sequential scan is in progress.
	When disabled, the memory limit may be exceeded by fast disks.
	.
	.It Sy zfs_scan_suspend_progress Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Freezes a scrub/resilver in progress without actually pausing it.
	Intended for testing/debugging.
	.
	.It Sy zfs_scan_vdev_limit Ns = Ns Sy 4194304 Ns B Po 4MB Pc Pq int
	Maximum amount of data that can be concurrently issued at once for scrubs and
	resilvers per leaf device, given in bytes.
	.
	.It Sy zfs_send_corrupt_data Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Allow sending of corrupt data (ignore read/checksum errors when sending).
	.
	.It Sy zfs_send_unmodified_spill_blocks Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Include unmodified spill blocks in the send stream.
	Under certain circumstances, previous versions of ZFS could incorrectly
	remove the spill block from an existing object.
	Including unmodified copies of the spill blocks creates a backwards-compatible
	stream which will recreate a spill block if it was incorrectly removed.
	.
	.It Sy zfs_send_no_prefetch_queue_ff Ns = Ns Sy 20 Ns ^-1 Pq int
	The fill fraction of the
	.Nm zfs Cm send
	internal queues.
	The fill fraction controls the timing with which internal threads are woken up.
	.
	.It Sy zfs_send_no_prefetch_queue_length Ns = Ns Sy 1048576 Ns B Po 1MB Pc Pq int
	The maximum number of bytes allowed in
	.Nm zfs Cm send Ns 's
	internal queues.
	.
	.It Sy zfs_send_queue_ff Ns = Ns Sy 20 Ns ^-1 Pq int
	The fill fraction of the
	.Nm zfs Cm send
	prefetch queue.
	The fill fraction controls the timing with which internal threads are woken up.
	.
	.It Sy zfs_send_queue_length Ns = Ns Sy 16777216 Ns B Po 16MB Pc Pq int
	The maximum number of bytes allowed that will be prefetched by
	.Nm zfs Cm send .
	This value must be at least twice the maximum block size in use.
	.
	.It Sy zfs_recv_queue_ff Ns = Ns Sy 20 Ns ^-1 Pq int
	The fill fraction of the
	.Nm zfs Cm receive
	queue.
	The fill fraction controls the timing with which internal threads are woken up.
	.
	.It Sy zfs_recv_queue_length Ns = Ns Sy 16777216 Ns B Po 16MB Pc Pq int
	The maximum number of bytes allowed in the
	.Nm zfs Cm receive
	queue.
	This value must be at least twice the maximum block size in use.
	.
	.It Sy zfs_recv_write_batch_size Ns = Ns Sy 1048576 Ns B Po 1MB Pc Pq int
	The maximum amount of data, in bytes, that
	.Nm zfs Cm receive
	will write in one DMU transaction.
	This is the uncompressed size, even when receiving a compressed send stream.
	This setting will not reduce the write size below a single block.
	Capped at a maximum of
	.Sy 32MB .
	.
	.It Sy zfs_override_estimate_recordsize Ns = Ns Sy 0 Ns \| Ns 1 Pq ulong
	Setting this variable overrides the default logic for estimating block
	sizes when doing a
	.Nm zfs Cm send .
	The default heuristic is that the average block size
	will be the current recordsize.
	Override this value if most data in your dataset is not of that size
	and you require accurate zfs send size estimates.
	.
	.It Sy zfs_sync_pass_deferred_free Ns = Ns Sy 2 Pq int
	Flushing of data to disk is done in passes.
	Defer frees starting in this pass.
	.
	.It Sy zfs_spa_discard_memory_limit Ns = Ns Sy 16777216 Ns B Po 16MB Pc Pq int
	Maximum memory used for prefetching a checkpoint's space map on each
	vdev while discarding the checkpoint.
	.
	.It Sy zfs_special_class_metadata_reserve_pct Ns = Ns Sy 25 Ns % Pq int
	Only allow small data blocks to be allocated on the special and dedup vdev
	types when the available free space percentage on these vdevs exceeds this value.
	This ensures reserved space is available for pool metadata as the
	special vdevs approach capacity.
	.
	.It Sy zfs_sync_pass_dont_compress Ns = Ns Sy 8 Pq int
	Starting in this sync pass, disable compression (including of metadata).
	With the default setting, in practice, we don't have this many sync passes,
	so this has no effect.
	.Pp
	The original intent was that disabling compression would help the sync passes
	to converge.
	However, in practice, disabling compression increases
	the average number of sync passes; because when we turn compression off,
	many blocks' size will change, and thus we have to re-allocate
	(not overwrite) them.
	It also increases the number of
	.Em 128kB
	allocations (e.g. for indirect blocks and spacemaps)
	because these will not be compressed.
	The
	.Em 128kB
	allocations are especially detrimental to performance
	on highly fragmented systems, which may have very few free segments of this size,
	and may need to load new metaslabs to satisfy these allocations.
	.
	.It Sy zfs_sync_pass_rewrite Ns = Ns Sy 2 Pq int
	Rewrite new block pointers starting in this pass.
	.
	.It Sy zfs_sync_taskq_batch_pct Ns = Ns Sy 75 Ns % Pq int
	This controls the number of threads used by
	.Sy dp_sync_taskq .
	The default value of
	.Sy 75%
	will create a maximum of one thread per CPU.
	.
	.It Sy zfs_trim_extent_bytes_max Ns = Ns Sy 134217728 Ns B Po 128MB Pc Pq uint
	Maximum size of TRIM command.
	Larger ranges will be split into chunks no larger than this value before issuing.
	.
	.It Sy zfs_trim_extent_bytes_min Ns = Ns Sy 32768 Ns B Po 32kB Pc Pq uint
	Minimum size of TRIM commands.
	TRIM ranges smaller than this will be skipped,
	unless they're part of a larger range which was chunked.
	This is done because it's common for these small TRIMs
	to negatively impact overall performance.
	.
	.It Sy zfs_trim_metaslab_skip Ns = Ns Sy 0 Ns \| Ns 1 Pq uint
	Skip uninitialized metaslabs during the TRIM process.
	This option is useful for pools constructed from large thinly-provisioned devices
	where TRIM operations are slow.
	As a pool ages, an increasing fraction of the pool's metaslabs
	will be initialized, progressively degrading the usefulness of this option.
	This setting is stored when starting a manual TRIM and will
	persist for the duration of the requested TRIM.
	.
	.It Sy zfs_trim_queue_limit Ns = Ns Sy 10 Pq uint
	Maximum number of queued TRIMs outstanding per leaf vdev.
	The number of concurrent TRIM commands issued to the device is controlled by
	.Sy zfs_vdev_trim_min_active No and Sy zfs_vdev_trim_max_active .
	.
	.It Sy zfs_trim_txg_batch Ns = Ns Sy 32 Pq uint
	The number of transaction groups' worth of frees which should be aggregated
	before TRIM operations are issued to the device.
	This setting represents a trade-off between issuing larger,
	more efficient TRIM operations and the delay
	before the recently trimmed space is available for use by the device.
	.Pp
	Increasing this value will allow frees to be aggregated for a longer time.
	This will result is larger TRIM operations and potentially increased memory usage.
	Decreasing this value will have the opposite effect.
	The default of
	.Sy 32
	was determined to be a reasonable compromise.
	.
	.It Sy zfs_txg_history Ns = Ns Sy 0 Pq int
	Historical statistics for this many latest TXGs will be available in
	.Pa /proc/spl/kstat/zfs/ Ns Ao Ar pool Ac Ns Pa /TXGs .
	.
	.It Sy zfs_txg_timeout Ns = Ns Sy 5 Ns s Pq int
	Flush dirty data to disk at least every this many seconds (maximum TXG duration).
	.
	.It Sy zfs_vdev_aggregate_trim Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Allow TRIM I/Os to be aggregated.
	This is normally not helpful because the extents to be trimmed
	will have been already been aggregated by the metaslab.
	This option is provided for debugging and performance analysis.
	.
	.It Sy zfs_vdev_aggregation_limit Ns = Ns Sy 1048576 Ns B Po 1MB Pc Pq int
	Max vdev I/O aggregation size.
	.
	.It Sy zfs_vdev_aggregation_limit_non_rotating Ns = Ns Sy 131072 Ns B Po 128kB Pc Pq int
	Max vdev I/O aggregation size for non-rotating media.
	.
	.It Sy zfs_vdev_cache_bshift Ns = Ns Sy 16 Po 64kB Pc Pq int
	Shift size to inflate reads to.
	.
	.It Sy zfs_vdev_cache_max Ns = Ns Sy 16384 Ns B Po 16kB Pc Pq int
	Inflate reads smaller than this value to meet the
	.Sy zfs_vdev_cache_bshift
	size
	.Pq default Sy 64kB .
	.
	.It Sy zfs_vdev_cache_size Ns = Ns Sy 0 Pq int
	Total size of the per-disk cache in bytes.
	.Pp
	Currently this feature is disabled, as it has been found to not be helpful
	for performance and in some cases harmful.
	.
	.It Sy zfs_vdev_mirror_rotating_inc Ns = Ns Sy 0 Pq int
	A number by which the balancing algorithm increments the load calculation for
	the purpose of selecting the least busy mirror member when an I/O operation
	immediately follows its predecessor on rotational vdevs
	for the purpose of making decisions based on load.
	.
	.It Sy zfs_vdev_mirror_rotating_seek_inc Ns = Ns Sy 5 Pq int
	A number by which the balancing algorithm increments the load calculation for
	the purpose of selecting the least busy mirror member when an I/O operation
	lacks locality as defined by
	.Sy zfs_vdev_mirror_rotating_seek_offset .
	Operations within this that are not immediately following the previous operation
	are incremented by half.
	.
	.It Sy zfs_vdev_mirror_rotating_seek_offset Ns = Ns Sy 1048576 Ns B Po 1MB Pc Pq int
	The maximum distance for the last queued I/O operation in which
	the balancing algorithm considers an operation to have locality.
	.No See Sx ZFS I/O SCHEDULER .
	.
	.It Sy zfs_vdev_mirror_non_rotating_inc Ns = Ns Sy 0 Pq int
	A number by which the balancing algorithm increments the load calculation for
	the purpose of selecting the least busy mirror member on non-rotational vdevs
	when I/O operations do not immediately follow one another.
	.
	.It Sy zfs_vdev_mirror_non_rotating_seek_inc Ns = Ns Sy 1 Pq int
	A number by which the balancing algorithm increments the load calculation for
	the purpose of selecting the least busy mirror member when an I/O operation lacks
	locality as defined by the
	.Sy zfs_vdev_mirror_rotating_seek_offset .
	Operations within this that are not immediately following the previous operation
	are incremented by half.
	.
	.It Sy zfs_vdev_read_gap_limit Ns = Ns Sy 32768 Ns B Po 32kB Pc Pq int
	Aggregate read I/O operations if the on-disk gap between them is within this
	threshold.
	.
	.It Sy zfs_vdev_write_gap_limit Ns = Ns Sy 4096 Ns B Po 4kB Pc Pq int
	Aggregate write I/O operations if the on-disk gap between them is within this
	threshold.
	.
	.It Sy zfs_vdev_raidz_impl Ns = Ns Sy fastest Pq string
	Select the raidz parity implementation to use.
	.Pp
	Variants that don't depend on CPU-specific features
	may be selected on module load, as they are supported on all systems.
	The remaining options may only be set after the module is loaded,
	as they are available only if the implementations are compiled in
	and supported on the running system.
	.Pp
	Once the module is loaded,
	.Pa /sys/module/zfs/parameters/zfs_vdev_raidz_impl
	will show the available options,
	with the currently selected one enclosed in square brackets.
	.Pp
	.TS
	lb l l .
	fastest selected by built-in benchmark
	original original implementation
	scalar scalar implementation
	sse2 SSE2 instruction set 64-bit x86
	ssse3 SSSE3 instruction set 64-bit x86
	avx2 AVX2 instruction set 64-bit x86
	avx512f AVX512F instruction set 64-bit x86
	avx512bw AVX512F & AVX512BW instruction sets 64-bit x86
	aarch64_neon NEON Aarch64/64-bit ARMv8
	aarch64_neonx2 NEON with more unrolling Aarch64/64-bit ARMv8
	powerpc_altivec Altivec PowerPC
	.TE
	.
	.It Sy zfs_vdev_scheduler Pq charp
	.Sy DEPRECATED .
	-Prints warning to kernel log for compatiblity.
	+Prints warning to kernel log for compatibility.
	.
	.It Sy zfs_zevent_len_max Ns = Ns Sy 512 Pq int
	Max event queue length.
	Events in the queue can be viewed with
	.Xr zpool-events 8 .
	.
	.It Sy zfs_zevent_retain_max Ns = Ns Sy 2000 Pq int
	Maximum recent zevent records to retain for duplicate checking.
	Setting this to
	.Sy 0
	disables duplicate detection.
	.
	.It Sy zfs_zevent_retain_expire_secs Ns = Ns Sy 900 Ns s Po 15min Pc Pq int
	Lifespan for a recent ereport that was retained for duplicate checking.
	.
	.It Sy zfs_zil_clean_taskq_maxalloc Ns = Ns Sy 1048576 Pq int
	The maximum number of taskq entries that are allowed to be cached.
	When this limit is exceeded transaction records (itxs)
	will be cleaned synchronously.
	.
	.It Sy zfs_zil_clean_taskq_minalloc Ns = Ns Sy 1024 Pq int
	The number of taskq entries that are pre-populated when the taskq is first
	created and are immediately available for use.
	.
	.It Sy zfs_zil_clean_taskq_nthr_pct Ns = Ns Sy 100 Ns % Pq int
	This controls the number of threads used by
	.Sy dp_zil_clean_taskq .
	The default value of
	.Sy 100%
	will create a maximum of one thread per cpu.
	.
	.It Sy zil_maxblocksize Ns = Ns Sy 131072 Ns B Po 128kB Pc Pq int
	This sets the maximum block size used by the ZIL.
	On very fragmented pools, lowering this
	.Pq typically to Sy 36kB
	can improve performance.
	.
	.It Sy zil_nocacheflush Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Disable the cache flush commands that are normally sent to disk by
	the ZIL after an LWB write has completed.
	Setting this will cause ZIL corruption on power loss
	if a volatile out-of-order write cache is enabled.
	.
	.It Sy zil_replay_disable Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Disable intent logging replay.
	Can be disabled for recovery from corrupted ZIL.
	.
	.It Sy zil_slog_bulk Ns = Ns Sy 786432 Ns B Po 768kB Pc Pq ulong
	Limit SLOG write size per commit executed with synchronous priority.
	Any writes above that will be executed with lower (asynchronous) priority
	to limit potential SLOG device abuse by single active ZIL writer.
	.
	.It Sy zfs_embedded_slog_min_ms Ns = Ns Sy 64 Pq int
	Usually, one metaslab from each normal-class vdev is dedicated for use by
	the ZIL to log synchronous writes.
	However, if there are fewer than
	.Sy zfs_embedded_slog_min_ms
	metaslabs in the vdev, this functionality is disabled.
	This ensures that we don't set aside an unreasonable amount of space for the ZIL.
	.
	.It Sy zio_deadman_log_all Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	If non-zero, the zio deadman will produce debugging messages
	.Pq see Sy zfs_dbgmsg_enable
	for all zios, rather than only for leaf zios possessing a vdev.
	This is meant to be used by developers to gain
	diagnostic information for hang conditions which don't involve a mutex
	or other locking primitive: typically conditions in which a thread in
	the zio pipeline is looping indefinitely.
	.
	.It Sy zio_slow_io_ms Ns = Ns Sy 30000 Ns ms Po 30s Pc Pq int
	When an I/O operation takes more than this much time to complete,
	it's marked as slow.
	Each slow operation causes a delay zevent.
	Slow I/O counters can be seen with
	.Nm zpool Cm status Fl s .
	.
	.It Sy zio_dva_throttle_enabled Ns = Ns Sy 1 Ns \| Ns 0 Pq int
	Throttle block allocations in the I/O pipeline.
	This allows for dynamic allocation distribution when devices are imbalanced.
	When enabled, the maximum number of pending allocations per top-level vdev
	is limited by
	.Sy zfs_vdev_queue_depth_pct .
	.
	.It Sy zio_requeue_io_start_cut_in_line Ns = Ns Sy 0 Ns \| Ns 1 Pq int
	Prioritize requeued I/O.
	.
	.It Sy zio_taskq_batch_pct Ns = Ns Sy 80 Ns % Pq uint
	Percentage of online CPUs which will run a worker thread for I/O.
	These workers are responsible for I/O work such as compression and
	checksum calculations.
	Fractional number of CPUs will be rounded down.
	.Pp
	The default value of
	.Sy 80%
	was chosen to avoid using all CPUs which can result in
	latency issues and inconsistent application performance,
	especially when slower compression and/or checksumming is enabled.
	.
	.It Sy zio_taskq_batch_tpq Ns = Ns Sy 0 Pq uint
	Number of worker threads per taskq.
	Lower values improve I/O ordering and CPU utilization,
	while higher reduces lock contention.
	.Pp
	If
	.Sy 0 ,
	generate a system-dependent value close to 6 threads per taskq.
	.
	.It Sy zvol_inhibit_dev Ns = Ns Sy 0 Ns \| Ns 1 Pq uint
	Do not create zvol device nodes.
	This may slightly improve startup time on
	systems with a very large number of zvols.
	.
	.It Sy zvol_major Ns = Ns Sy 230 Pq uint
	Major number for zvol block devices.
	.
	.It Sy zvol_max_discard_blocks Ns = Ns Sy 16384 Pq ulong
	Discard (TRIM) operations done on zvols will be done in batches of this
	many blocks, where block size is determined by the
	.Sy volblocksize
	property of a zvol.
	.
	.It Sy zvol_prefetch_bytes Ns = Ns Sy 131072 Ns B Po 128kB Pc Pq uint
	When adding a zvol to the system, prefetch this many bytes
	from the start and end of the volume.
	Prefetching these regions of the volume is desirable,
	because they are likely to be accessed immediately by
	.Xr blkid 8
	or the kernel partitioner.
	.
	.It Sy zvol_request_sync Ns = Ns Sy 0 Ns \| Ns 1 Pq uint
	When processing I/O requests for a zvol, submit them synchronously.
	This effectively limits the queue depth to
	.Em 1
	for each I/O submitter.
	When unset, requests are handled asynchronously by a thread pool.
	The number of requests which can be handled concurrently is controlled by
	.Sy zvol_threads .
	.
	.It Sy zvol_threads Ns = Ns Sy 32 Pq uint
	Max number of threads which can handle zvol I/O requests concurrently.
	.
	.It Sy zvol_volmode Ns = Ns Sy 1 Pq uint
	Defines zvol block devices behaviour when
	.Sy volmode Ns = Ns Sy default :
	.Bl -tag -compact -offset 4n -width "a"
	.It Sy 1
	.No equivalent to Sy full
	.It Sy 2
	.No equivalent to Sy dev
	.It Sy 3
	.No equivalent to Sy none
	.El
	.El
	.
	.Sh ZFS I/O SCHEDULER
	ZFS issues I/O operations to leaf vdevs to satisfy and complete I/O operations.
	The scheduler determines when and in what order those operations are issued.
	The scheduler divides operations into five I/O classes,
	prioritized in the following order: sync read, sync write, async read,
	async write, and scrub/resilver.
	Each queue defines the minimum and maximum number of concurrent operations
	that may be issued to the device.
	In addition, the device has an aggregate maximum,
	.Sy zfs_vdev_max_active .
	Note that the sum of the per-queue minima must not exceed the aggregate maximum.
	If the sum of the per-queue maxima exceeds the aggregate maximum,
	then the number of active operations may reach
	.Sy zfs_vdev_max_active ,
	in which case no further operations will be issued,
	regardless of whether all per-queue minima have been met.
	.Pp
	For many physical devices, throughput increases with the number of
	concurrent operations, but latency typically suffers.
	Furthermore, physical devices typically have a limit
	at which more concurrent operations have no
	effect on throughput or can actually cause it to decrease.
	.Pp
	The scheduler selects the next operation to issue by first looking for an
	I/O class whose minimum has not been satisfied.
	Once all are satisfied and the aggregate maximum has not been hit,
	the scheduler looks for classes whose maximum has not been satisfied.
	Iteration through the I/O classes is done in the order specified above.
	No further operations are issued
	if the aggregate maximum number of concurrent operations has been hit,
	or if there are no operations queued for an I/O class that has not hit its maximum.
	Every time an I/O operation is queued or an operation completes,
	the scheduler looks for new operations to issue.
	.Pp
	In general, smaller
	.Sy max_active Ns s
	will lead to lower latency of synchronous operations.
	Larger
	.Sy max_active Ns s
	may lead to higher overall throughput, depending on underlying storage.
	.Pp
	The ratio of the queues'
	.Sy max_active Ns s
	determines the balance of performance between reads, writes, and scrubs.
	For example, increasing
	.Sy zfs_vdev_scrub_max_active
	will cause the scrub or resilver to complete more quickly,
	but reads and writes to have higher latency and lower throughput.
	.Pp
	All I/O classes have a fixed maximum number of outstanding operations,
	except for the async write class.
	Asynchronous writes represent the data that is committed to stable storage
	during the syncing stage for transaction groups.
	Transaction groups enter the syncing state periodically,
	so the number of queued async writes will quickly burst up
	and then bleed down to zero.
	Rather than servicing them as quickly as possible,
	the I/O scheduler changes the maximum number of active async write operations
	according to the amount of dirty data in the pool.
	Since both throughput and latency typically increase with the number of
	concurrent operations issued to physical devices, reducing the
	burstiness in the number of concurrent operations also stabilizes the
	response time of operations from other – and in particular synchronous – queues.
	In broad strokes, the I/O scheduler will issue more concurrent operations
	from the async write queue as there's more dirty data in the pool.
	.
	.Ss Async Writes
	The number of concurrent operations issued for the async write I/O class
	follows a piece-wise linear function defined by a few adjustable points:
	.Bd -literal
	\| o---------\| <-- \fBzfs_vdev_async_write_max_active\fP
	^ \| /^ \|
	\| \| / \| \|
	active \| / \| \|
	I/O \| / \| \|
	count \| / \| \|
	\| / \| \|
	\|-------o \| \| <-- \fBzfs_vdev_async_write_min_active\fP
	0\|_______^______\|_________\|
	0% \| \| 100% of \fBzfs_dirty_data_max\fP
	\| \|
	\| `-- \fBzfs_vdev_async_write_active_max_dirty_percent\fP
	`--------- \fBzfs_vdev_async_write_active_min_dirty_percent\fP
	.Ed
	.Pp
	Until the amount of dirty data exceeds a minimum percentage of the dirty
	data allowed in the pool, the I/O scheduler will limit the number of
	concurrent operations to the minimum.
	As that threshold is crossed, the number of concurrent operations issued
	increases linearly to the maximum at the specified maximum percentage
	of the dirty data allowed in the pool.
	.Pp
	Ideally, the amount of dirty data on a busy pool will stay in the sloped
	part of the function between
	.Sy zfs_vdev_async_write_active_min_dirty_percent
	and
	.Sy zfs_vdev_async_write_active_max_dirty_percent .
	If it exceeds the maximum percentage,
	this indicates that the rate of incoming data is
	greater than the rate that the backend storage can handle.
	In this case, we must further throttle incoming writes,
	as described in the next section.
	.
	.Sh ZFS TRANSACTION DELAY
	We delay transactions when we've determined that the backend storage
	isn't able to accommodate the rate of incoming writes.
	.Pp
	If there is already a transaction waiting, we delay relative to when
	that transaction will finish waiting.
	This way the calculated delay time
	is independent of the number of threads concurrently executing transactions.
	.Pp
	If we are the only waiter, wait relative to when the transaction started,
	rather than the current time.
	This credits the transaction for "time already served",
	e.g. reading indirect blocks.
	.Pp
	The minimum time for a transaction to take is calculated as
	.Dl min_time = min( Ns Sy zfs_delay_scale No * (dirty - min) / (max - dirty), 100ms)
	.Pp
	The delay has two degrees of freedom that can be adjusted via tunables.
	The percentage of dirty data at which we start to delay is defined by
	.Sy zfs_delay_min_dirty_percent .
	This should typically be at or above
	.Sy zfs_vdev_async_write_active_max_dirty_percent ,
	so that we only start to delay after writing at full speed
	has failed to keep up with the incoming write rate.
	The scale of the curve is defined by
	.Sy zfs_delay_scale .
	Roughly speaking, this variable determines the amount of delay at the midpoint of the curve.
	.Bd -literal
	delay
	10ms +-------------------------------------------------------------*+
	\| *\|
	9ms + *+
	\| *\|
	8ms + *+
	\| * \|
	7ms + * +
	\| * \|
	6ms + * +
	\| * \|
	5ms + * +
	\| * \|
	4ms + * +
	\| * \|
	3ms + * +
	\| * \|
	2ms + (midpoint) * +
	\| \| ** \|
	1ms + v *** +
	\| \fBzfs_delay_scale\fP ----------> ******** \|
	0 +-------------------------------------*********----------------+
	0% <- \fBzfs_dirty_data_max\fP -> 100%
	.Ed
	.Pp
	Note, that since the delay is added to the outstanding time remaining on the
	most recent transaction it's effectively the inverse of IOPS.
	Here, the midpoint of
	.Em 500us
	translates to
	.Em 2000 IOPS .
	The shape of the curve
	was chosen such that small changes in the amount of accumulated dirty data
	in the first three quarters of the curve yield relatively small differences
	in the amount of delay.
	.Pp
	The effects can be easier to understand when the amount of delay is
	represented on a logarithmic scale:
	.Bd -literal
	delay
	100ms +-------------------------------------------------------------++
	+ +
	\| \|
	+ *+
	10ms + *+
	+ ** +
	\| (midpoint) ** \|
	+ \| ** +
	1ms + v **** +
	+ \fBzfs_delay_scale\fP ----------> ***** +
	\| **** \|
	+ **** +
	100us + ** +
	+ * +
	\| * \|
	+ * +
	10us + * +
	+ +
	\| \|
	+ +
	+--------------------------------------------------------------+
	0% <- \fBzfs_dirty_data_max\fP -> 100%
	.Ed
	.Pp
	Note here that only as the amount of dirty data approaches its limit does
	the delay start to increase rapidly.
	The goal of a properly tuned system should be to keep the amount of dirty data
	out of that range by first ensuring that the appropriate limits are set
	for the I/O scheduler to reach optimal throughput on the back-end storage,
	and then by changing the value of
	.Sy zfs_delay_scale
	to increase the steepness of the curve.
	diff --git a/sys/contrib/openzfs/man/man8/zfs-allow.8 b/sys/contrib/openzfs/man/man8/zfs-allow.8
	index 070161be5413..bbd62edc2896 100644
	--- a/sys/contrib/openzfs/man/man8/zfs-allow.8
	+++ b/sys/contrib/openzfs/man/man8/zfs-allow.8
	@@ -1,362 +1,386 @@
	.\"
	.\" CDDL HEADER START
	.\"
	.\" The contents of this file are subject to the terms of the
	.\" Common Development and Distribution License (the "License").
	.\" You may not use this file except in compliance with the License.
	.\"
	.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	.\" or http://www.opensolaris.org/os/licensing.
	.\" See the License for the specific language governing permissions
	.\" and limitations under the License.
	.\"
	.\" When distributing Covered Code, include this CDDL HEADER in each
	.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	.\" If applicable, add the following below this CDDL HEADER, with the
	.\" fields enclosed by brackets "[]" replaced with your own identifying
	.\" information: Portions Copyright [yyyy] [name of copyright owner]
	.\"
	.\" CDDL HEADER END
	.\"
	.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
	.\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
	.\" Copyright (c) 2011, 2019 by Delphix. All rights reserved.
	.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	.\" Copyright (c) 2014, Joyent, Inc. All rights reserved.
	.\" Copyright (c) 2014 by Adam Stevko. All rights reserved.
	.\" Copyright (c) 2014 Integros [integros.com]
	.\" Copyright 2019 Richard Laager. All rights reserved.
	.\" Copyright 2018 Nexenta Systems, Inc.
	.\" Copyright 2019 Joyent, Inc.
	.\"
	.Dd May 27, 2021
	.Dt ZFS-ALLOW 8
	.Os
	.
	.Sh NAME
	.Nm zfs-allow
	.Nd delegate ZFS administration permissions to unprivileged users
	.Sh SYNOPSIS
	.Nm zfs
	.Cm allow
	.Op Fl dglu
	.Ar user Ns \| Ns Ar group Ns Oo , Ns Ar user Ns \| Ns Ar group Oc Ns …
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Ar filesystem Ns \| Ns Ar volume
	.Nm zfs
	.Cm allow
	.Op Fl dl
	.Fl e Ns \| Ns Sy everyone
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Ar filesystem Ns \| Ns Ar volume
	.Nm zfs
	.Cm allow
	.Fl c
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Ar filesystem Ns \| Ns Ar volume
	.Nm zfs
	.Cm allow
	.Fl s No @ Ns Ar setname
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Ar filesystem Ns \| Ns Ar volume
	.Nm zfs
	.Cm unallow
	.Op Fl dglru
	.Ar user Ns \| Ns Ar group Ns Oo , Ns Ar user Ns \| Ns Ar group Oc Ns …
	.Oo Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns … Oc
	.Ar filesystem Ns \| Ns Ar volume
	.Nm zfs
	.Cm unallow
	.Op Fl dlr
	.Fl e Ns \| Ns Sy everyone
	.Oo Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns … Oc
	.Ar filesystem Ns \| Ns Ar volume
	.Nm zfs
	.Cm unallow
	.Op Fl r
	.Fl c
	.Oo Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns … Oc
	.Ar filesystem Ns \| Ns Ar volume
	.Nm zfs
	.Cm unallow
	.Op Fl r
	.Fl s No @ Ns Ar setname
	.Oo Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns … Oc
	.Ar filesystem Ns \| Ns Ar volume
	.
	.Sh DESCRIPTION
	.Bl -tag -width ""
	.It Xo
	.Nm zfs
	.Cm allow
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	Displays permissions that have been delegated on the specified filesystem or
	volume.
	See the other forms of
	.Nm zfs Cm allow
	for more information.
	.Pp
	Delegations are supported under Linux with the exception of
	.Sy mount ,
	.Sy unmount ,
	.Sy mountpoint ,
	.Sy canmount ,
	.Sy rename ,
	and
	.Sy share .
	These permissions cannot be delegated because the Linux
	.Xr mount 8
	command restricts modifications of the global namespace to the root user.
	.It Xo
	.Nm zfs
	.Cm allow
	.Op Fl dglu
	.Ar user Ns \| Ns Ar group Ns Oo , Ns Ar user Ns \| Ns Ar group Oc Ns …
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	.It Xo
	.Nm zfs
	.Cm allow
	.Op Fl dl
	.Fl e Ns \| Ns Sy everyone
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	Delegates ZFS administration permission for the file systems to non-privileged
	users.
	.Bl -tag -width "-d"
	.It Fl d
	Allow only for the descendent file systems.
	.It Fl e Ns \| Ns Sy everyone
	Specifies that the permissions be delegated to everyone.
	.It Fl g Ar group Ns Oo , Ns Ar group Oc Ns …
	Explicitly specify that permissions are delegated to the group.
	.It Fl l
	Allow
	.Qq locally
	only for the specified file system.
	.It Fl u Ar user Ns Oo , Ns Ar user Oc Ns …
	Explicitly specify that permissions are delegated to the user.
	.It Ar user Ns \| Ns Ar group Ns Oo , Ns Ar user Ns \| Ns Ar group Oc Ns …
	Specifies to whom the permissions are delegated.
	Multiple entities can be specified as a comma-separated list.
	If neither of the
	.Fl gu
	options are specified, then the argument is interpreted preferentially as the
	keyword
	.Sy everyone ,
	then as a user name, and lastly as a group name.
	To specify a user or group named
	.Qq everyone ,
	use the
	.Fl g
	or
	.Fl u
	options.
	To specify a group with the same name as a user, use the
	.Fl g
	options.
	.It Xo
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Xc
	The permissions to delegate.
	Multiple permissions may be specified as a comma-separated list.
	Permission names are the same as ZFS subcommand and property names.
	See the property list below.
	Property set names, which begin with
	.Sy @ ,
	may be specified.
	See the
	.Fl s
	form below for details.
	.El
	.Pp
	If neither of the
	.Fl dl
	options are specified, or both are, then the permissions are allowed for the
	file system or volume, and all of its descendents.
	.Pp
	Permissions are generally the ability to use a ZFS subcommand or change a ZFS
	property.
	The following permissions are available:
	.TS
	l l l .
	NAME TYPE NOTES
	_ _ _
	allow subcommand Must also have the permission that is being allowed
	bookmark subcommand
	clone subcommand Must also have the \fBcreate\fR ability and \fBmount\fR ability in the origin file system
	create subcommand Must also have the \fBmount\fR ability. Must also have the \fBrefreservation\fR ability to create a non-sparse volume.
	destroy subcommand Must also have the \fBmount\fR ability
	diff subcommand Allows lookup of paths within a dataset given an object number, and the ability to create snapshots necessary to \fBzfs diff\fR.
	hold subcommand Allows adding a user hold to a snapshot
	-load subcommand Allows loading and unloading of encryption key (see \fBzfs load-key\fR and \fBzfs unload-key\fR).
	-change subcommand Allows changing an encryption key via \fBzfs change-key\fR.
	+load-key subcommand Allows loading and unloading of encryption key (see \fBzfs load-key\fR and \fBzfs unload-key\fR).
	+change-key subcommand Allows changing an encryption key via \fBzfs change-key\fR.
	mount subcommand Allows mounting/umounting ZFS datasets
	promote subcommand Must also have the \fBmount\fR and \fBpromote\fR ability in the origin file system
	receive subcommand Must also have the \fBmount\fR and \fBcreate\fR ability
	release subcommand Allows releasing a user hold which might destroy the snapshot
	rename subcommand Must also have the \fBmount\fR and \fBcreate\fR ability in the new parent
	rollback subcommand Must also have the \fBmount\fR ability
	send subcommand
	share subcommand Allows sharing file systems over NFS or SMB protocols
	snapshot subcommand Must also have the \fBmount\fR ability

	groupquota other Allows accessing any \fBgroupquota@\fI...\fR property
	+groupobjquota other Allows accessing any \fBgroupobjquota@\fI...\fR property
	groupused other Allows reading any \fBgroupused@\fI...\fR property
	+groupobjused other Allows reading any \fBgroupobjused@\fI...\fR property
	userprop other Allows changing any user property
	userquota other Allows accessing any \fBuserquota@\fI...\fR property
	+userobjquota other Allows accessing any \fBuserobjquota@\fI...\fR property
	userused other Allows reading any \fBuserused@\fI...\fR property
	+userobjused other Allows reading any \fBuserobjused@\fI...\fR property
	projectobjquota other Allows accessing any \fBprojectobjquota@\fI...\fR property
	projectquota other Allows accessing any \fBprojectquota@\fI...\fR property
	projectobjused other Allows reading any \fBprojectobjused@\fI...\fR property
	projectused other Allows reading any \fBprojectused@\fI...\fR property

	aclinherit property
	+aclmode property
	acltype property
	atime property
	canmount property
	casesensitivity property
	checksum property
	compression property
	+context property
	copies property
	+dedup property
	+defcontext property
	devices property
	+dnodesize property
	+encryption property
	exec property
	filesystem_limit property
	+fscontext property
	+keyformat property
	+keylocation property
	+logbias property
	+mlslabel property
	mountpoint property
	nbmand property
	normalization property
	+overlay property
	+pbkdf2iters property
	primarycache property
	quota property
	readonly property
	recordsize property
	+redundant_metadata property
	refquota property
	refreservation property
	+relatime property
	reservation property
	+rootcontext property
	secondarycache property
	setuid property
	sharenfs property
	sharesmb property
	+snapdev property
	snapdir property
	snapshot_limit property
	+special_small_blocks property
	+sync property
	utf8only property
	version property
	volblocksize property
	+volmode property
	volsize property
	vscan property
	xattr property
	zoned property
	.TE
	.It Xo
	.Nm zfs
	.Cm allow
	.Fl c
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	Sets
	.Qq create time
	permissions.
	These permissions are granted
	.Pq locally
	to the creator of any newly-created descendent file system.
	.It Xo
	.Nm zfs
	.Cm allow
	.Fl s No @ Ns Ar setname
	.Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns …
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	Defines or adds permissions to a permission set.
	The set can be used by other
	.Nm zfs Cm allow
	commands for the specified file system and its descendents.
	Sets are evaluated dynamically, so changes to a set are immediately reflected.
	Permission sets follow the same naming restrictions as ZFS file systems, but the
	name must begin with
	.Sy @ ,
	and can be no more than 64 characters long.
	.It Xo
	.Nm zfs
	.Cm unallow
	.Op Fl dglru
	.Ar user Ns \| Ns Ar group Ns Oo , Ns Ar user Ns \| Ns Ar group Oc Ns …
	.Oo Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns … Oc
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	.It Xo
	.Nm zfs
	.Cm unallow
	.Op Fl dlr
	.Fl e Ns \| Ns Sy everyone
	.Oo Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns … Oc
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	.It Xo
	.Nm zfs
	.Cm unallow
	.Op Fl r
	.Fl c
	.Oo Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns … Oc
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	Removes permissions that were granted with the
	.Nm zfs Cm allow
	command.
	No permissions are explicitly denied, so other permissions granted are still in
	effect.
	For example, if the permission is granted by an ancestor.
	If no permissions are specified, then all permissions for the specified
	.Ar user ,
	.Ar group ,
	or
	.Sy everyone
	are removed.
	Specifying
	.Sy everyone
	.Po or using the
	.Fl e
	option
	.Pc
	only removes the permissions that were granted to everyone, not all permissions
	for every user and group.
	See the
	.Nm zfs Cm allow
	command for a description of the
	.Fl ldugec
	options.
	.Bl -tag -width "-r"
	.It Fl r
	Recursively remove the permissions from this file system and all descendents.
	.El
	.It Xo
	.Nm zfs
	.Cm unallow
	.Op Fl r
	.Fl s No @ Ns Ar setname
	.Oo Ar perm Ns \| Ns @ Ns Ar setname Ns Oo , Ns Ar perm Ns \| Ns @ Ns
	.Ar setname Oc Ns … Oc
	.Ar filesystem Ns \| Ns Ar volume
	.Xc
	Removes permissions from a permission set.
	If no permissions are specified, then all permissions are removed, thus removing
	the set entirely.
	.El
	diff --git a/sys/contrib/openzfs/man/man8/zfs-send.8 b/sys/contrib/openzfs/man/man8/zfs-send.8
	index a3d08fbf6e2c..688bd033979a 100644
	--- a/sys/contrib/openzfs/man/man8/zfs-send.8
	+++ b/sys/contrib/openzfs/man/man8/zfs-send.8
	@@ -1,648 +1,652 @@
	.\"
	.\" CDDL HEADER START
	.\"
	.\" The contents of this file are subject to the terms of the
	.\" Common Development and Distribution License (the "License").
	.\" You may not use this file except in compliance with the License.
	.\"
	.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	.\" or http://www.opensolaris.org/os/licensing.
	.\" See the License for the specific language governing permissions
	.\" and limitations under the License.
	.\"
	.\" When distributing Covered Code, include this CDDL HEADER in each
	.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	.\" If applicable, add the following below this CDDL HEADER, with the
	.\" fields enclosed by brackets "[]" replaced with your own identifying
	.\" information: Portions Copyright [yyyy] [name of copyright owner]
	.\"
	.\" CDDL HEADER END
	.\"
	.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
	.\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
	.\" Copyright (c) 2011, 2019 by Delphix. All rights reserved.
	.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	.\" Copyright (c) 2014, Joyent, Inc. All rights reserved.
	.\" Copyright (c) 2014 by Adam Stevko. All rights reserved.
	.\" Copyright (c) 2014 Integros [integros.com]
	.\" Copyright 2019 Richard Laager. All rights reserved.
	.\" Copyright 2018 Nexenta Systems, Inc.
	.\" Copyright 2019 Joyent, Inc.
	.\"
	.Dd April 15, 2021
	.Dt ZFS-SEND 8
	.Os
	.
	.Sh NAME
	.Nm zfs-send
	.Nd generate backup stream of ZFS dataset
	.Sh SYNOPSIS
	.Nm zfs
	.Cm send
	.Op Fl DLPRbcehnpsvw
	.Op Oo Fl I Ns \| Ns Fl i Oc Ar snapshot
	.Ar snapshot
	.Nm zfs
	.Cm send
	-.Op Fl DLPRcenpsvw
	+.Op Fl DLPcensvw
	.Op Fl i Ar snapshot Ns \| Ns Ar bookmark
	.Ar filesystem Ns \| Ns Ar volume Ns \| Ns Ar snapshot
	.Nm zfs
	.Cm send
	.Fl -redact Ar redaction_bookmark
	.Op Fl DLPcenpv
	.Op Fl i Ar snapshot Ns \| Ns Ar bookmark
	.Ar snapshot
	.Nm zfs
	.Cm send
	.Op Fl Penv
	.Fl t
	.Ar receive_resume_token
	.Nm zfs
	.Cm send
	.Op Fl Pnv
	.Fl S Ar filesystem
	.Nm zfs
	.Cm redact
	.Ar snapshot redaction_bookmark
	.Ar redaction_snapshot Ns …
	.
	.Sh DESCRIPTION
	.Bl -tag -width ""
	.It Xo
	.Nm zfs
	.Cm send
	.Op Fl DLPRbcehnpvw
	.Op Oo Fl I Ns \| Ns Fl i Oc Ar snapshot
	.Ar snapshot
	.Xc
	Creates a stream representation of the second
	.Ar snapshot ,
	which is written to standard output.
	The output can be redirected to a file or to a different system
	.Po for example, using
	.Xr ssh 1
	.Pc .
	By default, a full stream is generated.
	.Bl -tag -width "-D"
	.It Fl D , -dedup
	Deduplicated send is no longer supported.
	This flag is accepted for backwards compatibility, but a regular,
	non-deduplicated stream will be generated.
	.It Fl I Ar snapshot
	Generate a stream package that sends all intermediary snapshots from the first
	snapshot to the second snapshot.
	For example,
	.Fl I Em @a Em fs@d
	is similar to
	.Fl i Em @a Em fs@b Ns \&; Fl i Em @b Em fs@c Ns \&; Fl i Em @c Em fs@d .
	The incremental source may be specified as with the
	.Fl i
	option.
	.It Fl L , -large-block
	Generate a stream which may contain blocks larger than 128KB.
	This flag has no effect if the
	.Sy large_blocks
	pool feature is disabled, or if the
	.Sy recordsize
	property of this filesystem has never been set above 128KB.
	The receiving system must have the
	.Sy large_blocks
	pool feature enabled as well.
	See
	.Xr zpool-features 7
	for details on ZFS feature flags and the
	.Sy large_blocks
	feature.
	.It Fl P , -parsable
	Print machine-parsable verbose information about the stream package generated.
	.It Fl R , -replicate
	Generate a replication stream package, which will replicate the specified
	file system, and all descendent file systems, up to the named snapshot.
	When received, all properties, snapshots, descendent file systems, and clones
	are preserved.
	.Pp
	If the
	.Fl i
	or
	.Fl I
	flags are used in conjunction with the
	.Fl R
	flag, an incremental replication stream is generated.
	The current values of properties, and current snapshot and file system names are
	set when the stream is received.
	If the
	.Fl F
	flag is specified when this stream is received, snapshots and file systems that
	do not exist on the sending side are destroyed.
	If the
	.Fl R
	flag is used to send encrypted datasets, then
	.Fl w
	must also be specified.
	.It Fl e , -embed
	Generate a more compact stream by using
	.Sy WRITE_EMBEDDED
	records for blocks which are stored more compactly on disk by the
	.Sy embedded_data
	pool feature.
	This flag has no effect if the
	.Sy embedded_data
	feature is disabled.
	The receiving system must have the
	.Sy embedded_data
	feature enabled.
	If the
	.Sy lz4_compress
	feature is active on the sending system, then the receiving system must have
	that feature enabled as well.
	Datasets that are sent with this flag may not be
	received as an encrypted dataset, since encrypted datasets cannot use the
	.Sy embedded_data
	feature.
	See
	.Xr zpool-features 7
	for details on ZFS feature flags and the
	.Sy embedded_data
	feature.
	.It Fl b , -backup
	Sends only received property values whether or not they are overridden by local
	settings, but only if the dataset has ever been received.
	Use this option when you want
	.Nm zfs Cm receive
	to restore received properties backed up on the sent dataset and to avoid
	sending local settings that may have nothing to do with the source dataset,
	but only with how the data is backed up.
	.It Fl c , -compressed
	Generate a more compact stream by using compressed WRITE records for blocks
	which are compressed on disk and in memory
	.Po see the
	.Sy compression
	property for details
	.Pc .
	If the
	.Sy lz4_compress
	feature is active on the sending system, then the receiving system must have
	that feature enabled as well.
	If the
	.Sy large_blocks
	feature is enabled on the sending system but the
	.Fl L
	option is not supplied in conjunction with
	.Fl c ,
	then the data will be decompressed before sending so it can be split into
	smaller block sizes.
	Streams sent with
	.Fl c
	will not have their data recompressed on the receiver side using
	.Fl o Sy compress Ns = Ar value .
	The data will stay compressed as it was from the sender.
	The new compression property will be set for future data.
	.It Fl w , -raw
	For encrypted datasets, send data exactly as it exists on disk.
	This allows backups to be taken even if encryption keys are not currently loaded.
	The backup may then be received on an untrusted machine since that machine will
	not have the encryption keys to read the protected data or alter it without
	being detected.
	Upon being received, the dataset will have the same encryption
	keys as it did on the send side, although the
	.Sy keylocation
	property will be defaulted to
	.Sy prompt
	if not otherwise provided.
	For unencrypted datasets, this flag will be equivalent to
	.Fl Lec .
	Note that if you do not use this flag for sending encrypted datasets, data will
	be sent unencrypted and may be re-encrypted with a different encryption key on
	the receiving system, which will disable the ability to do a raw send to that
	system for incrementals.
	.It Fl h , -holds
	Generate a stream package that includes any snapshot holds (created with the
	.Nm zfs Cm hold
	command), and indicating to
	.Nm zfs Cm receive
	that the holds be applied to the dataset on the receiving system.
	.It Fl i Ar snapshot
	Generate an incremental stream from the first
	.Ar snapshot
	.Pq the incremental source
	to the second
	.Ar snapshot
	.Pq the incremental target .
	The incremental source can be specified as the last component of the snapshot
	name
	.Po the
	.Sy @
	character and following
	.Pc
	and it is assumed to be from the same file system as the incremental target.
	.Pp
	If the destination is a clone, the source may be the origin snapshot, which must
	be fully specified
	.Po for example,
	.Em pool/fs@origin ,
	not just
	.Em @origin
	.Pc .
	.It Fl n , -dryrun
	Do a dry-run
	.Pq Qq No-op
	send.
	Do not generate any actual send data.
	This is useful in conjunction with the
	.Fl v
	or
	.Fl P
	flags to determine what data will be sent.
	In this case, the verbose output will be written to standard output
	.Po contrast with a non-dry-run, where the stream is written to standard output
	and the verbose output goes to standard error
	.Pc .
	.It Fl p , -props
	Include the dataset's properties in the stream.
	This flag is implicit when
	.Fl R
	is specified.
	The receiving system must also support this feature.
	Sends of encrypted datasets must use
	.Fl w
	when using this flag.
	.It Fl s , -skip-missing
	Allows sending a replication stream even when there are snapshots missing in the
	hierarchy.
	When a snapshot is missing, instead of throwing an error and aborting the send,
	a warning is printed to the standard error stream and the dataset to which it belongs
	and its descendents are skipped.
	This flag can only be used in conjunction with
	.Fl R .
	.It Fl v , -verbose
	Print verbose information about the stream package generated.
	This information includes a per-second report of how much data has been sent.
	.Pp
	The format of the stream is committed.
	You will be able to receive your streams on future versions of ZFS.
	.El
	.It Xo
	.Nm zfs
	.Cm send
	-.Op Fl DLPRcenpvw
	+.Op Fl DLPcenvw
	.Op Fl i Ar snapshot Ns \| Ns Ar bookmark
	.Ar filesystem Ns \| Ns Ar volume Ns \| Ns Ar snapshot
	.Xc
	Generate a send stream, which may be of a filesystem, and may be incremental
	from a bookmark.
	If the destination is a filesystem or volume, the pool must be read-only, or the
	filesystem must not be mounted.
	When the stream generated from a filesystem or volume is received, the default
	snapshot name will be
	.Qq --head-- .
	-.Bl -tag -width "-L"
	+.Bl -tag -width "-D"
	+.It Fl D , -dedup
	+Deduplicated send is no longer supported.
	+This flag is accepted for backwards compatibility, but a regular,
	+non-deduplicated stream will be generated.
	.It Fl L , -large-block
	Generate a stream which may contain blocks larger than 128KB.
	This flag has no effect if the
	.Sy large_blocks
	pool feature is disabled, or if the
	.Sy recordsize
	property of this filesystem has never been set above 128KB.
	The receiving system must have the
	.Sy large_blocks
	pool feature enabled as well.
	See
	.Xr zpool-features 7
	for details on ZFS feature flags and the
	.Sy large_blocks
	feature.
	.It Fl P , -parsable
	Print machine-parsable verbose information about the stream package generated.
	.It Fl c , -compressed
	Generate a more compact stream by using compressed WRITE records for blocks
	which are compressed on disk and in memory
	.Po see the
	.Sy compression
	property for details
	.Pc .
	If the
	.Sy lz4_compress
	feature is active on the sending system, then the receiving system must have
	that feature enabled as well.
	If the
	.Sy large_blocks
	feature is enabled on the sending system but the
	.Fl L
	option is not supplied in conjunction with
	.Fl c ,
	then the data will be decompressed before sending so it can be split into
	smaller block sizes.
	.It Fl w , -raw
	For encrypted datasets, send data exactly as it exists on disk.
	This allows backups to be taken even if encryption keys are not currently loaded.
	The backup may then be received on an untrusted machine since that machine will
	not have the encryption keys to read the protected data or alter it without
	being detected.
	Upon being received, the dataset will have the same encryption
	keys as it did on the send side, although the
	.Sy keylocation
	property will be defaulted to
	.Sy prompt
	if not otherwise provided.
	For unencrypted datasets, this flag will be equivalent to
	.Fl Lec .
	Note that if you do not use this flag for sending encrypted datasets, data will
	be sent unencrypted and may be re-encrypted with a different encryption key on
	the receiving system, which will disable the ability to do a raw send to that
	system for incrementals.
	.It Fl e , -embed
	Generate a more compact stream by using
	.Sy WRITE_EMBEDDED
	records for blocks which are stored more compactly on disk by the
	.Sy embedded_data
	pool feature.
	This flag has no effect if the
	.Sy embedded_data
	feature is disabled.
	The receiving system must have the
	.Sy embedded_data
	feature enabled.
	If the
	.Sy lz4_compress
	feature is active on the sending system, then the receiving system must have
	that feature enabled as well.
	Datasets that are sent with this flag may not be received as an encrypted dataset,
	since encrypted datasets cannot use the
	.Sy embedded_data
	feature.
	See
	.Xr zpool-features 7
	for details on ZFS feature flags and the
	.Sy embedded_data
	feature.
	.It Fl i Ar snapshot Ns \| Ns Ar bookmark
	Generate an incremental send stream.
	The incremental source must be an earlier snapshot in the destination's history.
	It will commonly be an earlier snapshot in the destination's file system, in
	which case it can be specified as the last component of the name
	.Po the
	.Sy #
	or
	.Sy @
	character and following
	.Pc .
	.Pp
	If the incremental target is a clone, the incremental source can be the origin
	snapshot, or an earlier snapshot in the origin's filesystem, or the origin's
	origin, etc.
	.It Fl n , -dryrun
	Do a dry-run
	.Pq Qq No-op
	send.
	Do not generate any actual send data.
	This is useful in conjunction with the
	.Fl v
	or
	.Fl P
	flags to determine what data will be sent.
	In this case, the verbose output will be written to standard output
	.Po contrast with a non-dry-run, where the stream is written to standard output
	and the verbose output goes to standard error
	.Pc .
	.It Fl v , -verbose
	Print verbose information about the stream package generated.
	This information includes a per-second report of how much data has been sent.
	.El
	.It Xo
	.Nm zfs
	.Cm send
	.Fl -redact Ar redaction_bookmark
	.Op Fl DLPcenpv
	.Op Fl i Ar snapshot Ns \| Ns Ar bookmark
	.Ar snapshot
	.Xc
	Generate a redacted send stream.
	This send stream contains all blocks from the snapshot being sent that aren't
	included in the redaction list contained in the bookmark specified by the
	.Fl -redact
	(or
	.Fl d )
	flag.
	The resulting send stream is said to be redacted with respect to the snapshots
	the bookmark specified by the
	.Fl -redact No flag was created with.
	The bookmark must have been created by running
	.Nm zfs Cm redact
	on the snapshot being sent.
	.Pp
	This feature can be used to allow clones of a filesystem to be made available on
	a remote system, in the case where their parent need not (or needs to not) be
	usable.
	For example, if a filesystem contains sensitive data, and it has clones where
	that sensitive data has been secured or replaced with dummy data, redacted sends
	can be used to replicate the secured data without replicating the original
	sensitive data, while still sharing all possible blocks.
	A snapshot that has been redacted with respect to a set of snapshots will
	contain all blocks referenced by at least one snapshot in the set, but will
	contain none of the blocks referenced by none of the snapshots in the set.
	In other words, if all snapshots in the set have modified a given block in the
	parent, that block will not be sent; but if one or more snapshots have not
	modified a block in the parent, they will still reference the parent's block, so
	that block will be sent.
	Note that only user data will be redacted.
	.Pp
	When the redacted send stream is received, we will generate a redacted
	snapshot.
	Due to the nature of redaction, a redacted dataset can only be used in the
	following ways:
	.Bl -enum -width "a."
	.It
	To receive, as a clone, an incremental send from the original snapshot to one
	of the snapshots it was redacted with respect to.
	In this case, the stream will produce a valid dataset when received because all
	blocks that were redacted in the parent are guaranteed to be present in the
	child's send stream.
	This use case will produce a normal snapshot, which can be used just like other
	snapshots.
	.
	.It
	To receive an incremental send from the original snapshot to something
	redacted with respect to a subset of the set of snapshots the initial snapshot
	was redacted with respect to.
	In this case, each block that was redacted in the original is still redacted
	(redacting with respect to additional snapshots causes less data to be redacted
	(because the snapshots define what is permitted, and everything else is
	redacted)).
	This use case will produce a new redacted snapshot.
	.It
	To receive an incremental send from a redaction bookmark of the original
	snapshot that was created when redacting with respect to a subset of the set of
	snapshots the initial snapshot was created with respect to
	anything else.
	A send stream from such a redaction bookmark will contain all of the blocks
	necessary to fill in any redacted data, should it be needed, because the sending
	system is aware of what blocks were originally redacted.
	This will either produce a normal snapshot or a redacted one, depending on
	whether the new send stream is redacted.
	.It
	To receive an incremental send from a redacted version of the initial
	snapshot that is redacted with respect to a subject of the set of snapshots the
	initial snapshot was created with respect to.
	A send stream from a compatible redacted dataset will contain all of the blocks
	necessary to fill in any redacted data.
	This will either produce a normal snapshot or a redacted one, depending on
	whether the new send stream is redacted.
	.It
	To receive a full send as a clone of the redacted snapshot.
	Since the stream is a full send, it definitionally contains all the data needed
	to create a new dataset.
	This use case will either produce a normal snapshot or a redacted one, depending
	on whether the full send stream was redacted.
	.El
	.Pp
	These restrictions are detected and enforced by
	.Nm zfs Cm receive ;
	a redacted send stream will contain the list of snapshots that the stream is
	redacted with respect to.
	These are stored with the redacted snapshot, and are used to detect and
	correctly handle the cases above.
	Note that for technical reasons,
	raw sends and redacted sends cannot be combined at this time.
	.It Xo
	.Nm zfs
	.Cm send
	.Op Fl Penv
	.Fl t
	.Ar receive_resume_token
	.Xc
	Creates a send stream which resumes an interrupted receive.
	The
	.Ar receive_resume_token
	is the value of this property on the filesystem or volume that was being
	received into.
	See the documentation for
	.Nm zfs Cm receive Fl s
	for more details.
	.It Xo
	.Nm zfs
	.Cm send
	.Op Fl Pnv
	.Op Fl i Ar snapshot Ns \| Ns Ar bookmark
	.Fl S
	.Ar filesystem
	.Xc
	Generate a send stream from a dataset that has been partially received.
	.Bl -tag -width "-L"
	.It Fl S , -saved
	This flag requires that the specified filesystem previously received a resumable
	send that did not finish and was interrupted.
	In such scenarios this flag
	enables the user to send this partially received state.
	Using this flag will always use the last fully received snapshot
	as the incremental source if it exists.
	.El
	.It Xo
	.Nm zfs
	.Cm redact
	.Ar snapshot redaction_bookmark
	.Ar redaction_snapshot Ns …
	.Xc
	Generate a new redaction bookmark.
	In addition to the typical bookmark information, a redaction bookmark contains
	the list of redacted blocks and the list of redaction snapshots specified.
	The redacted blocks are blocks in the snapshot which are not referenced by any
	of the redaction snapshots.
	These blocks are found by iterating over the metadata in each redaction snapshot
	to determine what has been changed since the target snapshot.
	Redaction is designed to support redacted zfs sends; see the entry for
	.Nm zfs Cm send
	for more information on the purpose of this operation.
	If a redact operation fails partway through (due to an error or a system
	failure), the redaction can be resumed by rerunning the same command.
	.El
	.Ss Redaction
	ZFS has support for a limited version of data subsetting, in the form of
	redaction.
	Using the
	.Nm zfs Cm redact
	command, a
	.Sy redaction bookmark
	can be created that stores a list of blocks containing sensitive information.
	When provided to
	.Nm zfs Cm send ,
	this causes a
	.Sy redacted send
	to occur.
	Redacted sends omit the blocks containing sensitive information,
	replacing them with REDACT records.
	When these send streams are received, a
	.Sy redacted dataset
	is created.
	A redacted dataset cannot be mounted by default, since it is incomplete.
	It can be used to receive other send streams.
	In this way datasets can be used for data backup and replication,
	with all the benefits that zfs send and receive have to offer,
	while protecting sensitive information from being
	stored on less-trusted machines or services.
	.Pp
	For the purposes of redaction, there are two steps to the process.
	A redact step, and a send/receive step.
	First, a redaction bookmark is created.
	This is done by providing the
	.Nm zfs Cm redact
	command with a parent snapshot, a bookmark to be created, and a number of
	redaction snapshots.
	These redaction snapshots must be descendants of the parent snapshot,
	and they should modify data that is considered sensitive in some way.
	Any blocks of data modified by all of the redaction snapshots will
	be listed in the redaction bookmark, because it represents the truly sensitive
	information.
	When it comes to the send step, the send process will not send
	the blocks listed in the redaction bookmark, instead replacing them with
	REDACT records.
	When received on the target system, this will create a
	redacted dataset, missing the data that corresponds to the blocks in the
	redaction bookmark on the sending system.
	The incremental send streams from
	the original parent to the redaction snapshots can then also be received on
	the target system, and this will produce a complete snapshot that can be used
	normally.
	Incrementals from one snapshot on the parent filesystem and another
	can also be done by sending from the redaction bookmark, rather than the
	snapshots themselves.
	.Pp
	In order to make the purpose of the feature more clear, an example is provided.
	Consider a zfs filesystem containing four files.
	These files represent information for an online shopping service.
	One file contains a list of usernames and passwords, another contains purchase histories,
	a third contains click tracking data, and a fourth contains user preferences.
	The owner of this data wants to make it available for their development teams to
	test against, and their market research teams to do analysis on.
	The development teams need information about user preferences and the click
	tracking data, while the market research teams need information about purchase
	histories and user preferences.
	Neither needs access to the usernames and passwords.
	However, because all of this data is stored in one ZFS filesystem,
	it must all be sent and received together.
	In addition, the owner of the data
	wants to take advantage of features like compression, checksumming, and
	snapshots, so they do want to continue to use ZFS to store and transmit their data.
	Redaction can help them do so.
	First, they would make two clones of a snapshot of the data on the source.
	In one clone, they create the setup they want their market research team to see;
	they delete the usernames and passwords file,
	and overwrite the click tracking data with dummy information.
	In another, they create the setup they want the development teams
	to see, by replacing the passwords with fake information and replacing the
	purchase histories with randomly generated ones.
	They would then create a redaction bookmark on the parent snapshot,
	using snapshots on the two clones as redaction snapshots.
	The parent can then be sent, redacted, to the target
	server where the research and development teams have access.
	Finally, incremental sends from the parent snapshot to each of the clones can be sent
	to and received on the target server; these snapshots are identical to the
	ones on the source, and are ready to be used, while the parent snapshot on the
	target contains none of the username and password data present on the source,
	because it was removed by the redacted send operation.
	.
	.Sh SEE ALSO
	.Xr zfs-bookmark 8 ,
	.Xr zfs-receive 8 ,
	.Xr zfs-redact 8 ,
	.Xr zfs-snapshot 8
	diff --git a/sys/contrib/openzfs/man/man8/zpool-remove.8 b/sys/contrib/openzfs/man/man8/zpool-remove.8
	index 1429180385cc..a14218ee17fd 100644
	--- a/sys/contrib/openzfs/man/man8/zpool-remove.8
	+++ b/sys/contrib/openzfs/man/man8/zpool-remove.8
	@@ -1,111 +1,111 @@
	.\"
	.\" CDDL HEADER START
	.\"
	.\" The contents of this file are subject to the terms of the
	.\" Common Development and Distribution License (the "License").
	.\" You may not use this file except in compliance with the License.
	.\"
	.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	.\" or http://www.opensolaris.org/os/licensing.
	.\" See the License for the specific language governing permissions
	.\" and limitations under the License.
	.\"
	.\" When distributing Covered Code, include this CDDL HEADER in each
	.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	.\" If applicable, add the following below this CDDL HEADER, with the
	.\" fields enclosed by brackets "[]" replaced with your own identifying
	.\" information: Portions Copyright [yyyy] [name of copyright owner]
	.\"
	.\" CDDL HEADER END
	.\"
	.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
	.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
	.\" Copyright (c) 2017 Datto Inc.
	.\" Copyright (c) 2018 George Melikov. All Rights Reserved.
	.\" Copyright 2017 Nexenta Systems, Inc.
	.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
	.\"
	.Dd August 9, 2019
	.Dt ZPOOL-REMOVE 8
	.Os
	.Sh NAME
	.Nm zpool-remove
	.Nd remove devices from ZFS storage pool
	.Sh SYNOPSIS
	.Nm zpool
	.Cm remove
	.Op Fl npw
	.Ar pool Ar device Ns …
	.Nm zpool
	.Cm remove
	.Fl s
	.Ar pool
	.Sh DESCRIPTION
	.Bl -tag -width Ds
	.It Xo
	.Nm zpool
	.Cm remove
	.Op Fl npw
	.Ar pool Ar device Ns …
	.Xc
	Removes the specified device from the pool.
	This command supports removing hot spare, cache, log, and both mirrored and
	non-redundant primary top-level vdevs, including dedup and special vdevs.
	-When the primary pool storage includes a top-level raidz vdev only hot spare,
	-cache, and log devices can be removed.
	-Note that keys for all encrypted datasets must be loaded for top-level vdevs
	-to be removed.
	+.Pp
	+Top-level vdevs can only be removed if the primary pool storage does not contain
	+a top-level raidz vdev, all top-level vdevs have the same sector size, and the
	+keys for all encrypted datasets are loaded.
	.Pp
	Removing a top-level vdev reduces the total amount of space in the storage pool.
	The specified device will be evacuated by copying all allocated space from it to
	the other devices in the pool.
	In this case, the
	.Nm zpool Cm remove
	command initiates the removal and returns, while the evacuation continues in
	the background.
	The removal progress can be monitored with
	.Nm zpool Cm status .
	If an IO error is encountered during the removal process it will be cancelled.
	The
	.Sy device_removal
	feature flag must be enabled to remove a top-level vdev, see
	.Xr zpool-features 7 .
	.Pp
	A mirrored top-level device (log or data) can be removed by specifying the top-level mirror for the
	same.
	Non-log devices or data devices that are part of a mirrored configuration can be removed using
	the
	.Nm zpool Cm detach
	command.
	.Bl -tag -width Ds
	.It Fl n
	Do not actually perform the removal
	.Pq Qq No-op .
	Instead, print the estimated amount of memory that will be used by the
	mapping table after the removal completes.
	This is nonzero only for top-level vdevs.
	.El
	.Bl -tag -width Ds
	.It Fl p
	Used in conjunction with the
	.Fl n
	flag, displays numbers as parsable (exact) values.
	.It Fl w
	Waits until the removal has completed before returning.
	.El
	.It Xo
	.Nm zpool
	.Cm remove
	.Fl s
	.Ar pool
	.Xc
	Stops and cancels an in-progress removal of a top-level vdev.
	.El
	.Sh SEE ALSO
	.Xr zpool-add 8 ,
	.Xr zpool-detach 8 ,
	.Xr zpool-labelclear 8 ,
	.Xr zpool-offline 8 ,
	.Xr zpool-replace 8 ,
	.Xr zpool-split 8
	diff --git a/sys/contrib/openzfs/man/man8/zpool-scrub.8 b/sys/contrib/openzfs/man/man8/zpool-scrub.8
	index 10375b6393ac..768f71539290 100644
	--- a/sys/contrib/openzfs/man/man8/zpool-scrub.8
	+++ b/sys/contrib/openzfs/man/man8/zpool-scrub.8
	@@ -1,98 +1,123 @@
	.\"
	.\" CDDL HEADER START
	.\"
	.\" The contents of this file are subject to the terms of the
	.\" Common Development and Distribution License (the "License").
	.\" You may not use this file except in compliance with the License.
	.\"
	.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	.\" or http://www.opensolaris.org/os/licensing.
	.\" See the License for the specific language governing permissions
	.\" and limitations under the License.
	.\"
	.\" When distributing Covered Code, include this CDDL HEADER in each
	.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	.\" If applicable, add the following below this CDDL HEADER, with the
	.\" fields enclosed by brackets "[]" replaced with your own identifying
	.\" information: Portions Copyright [yyyy] [name of copyright owner]
	.\"
	.\" CDDL HEADER END
	.\"
	.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
	.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
	.\" Copyright (c) 2017 Datto Inc.
	-.\" Copyright (c) 2018 George Melikov. All Rights Reserved.
	+.\" Copyright (c) 2018, 2021 George Melikov. All Rights Reserved.
	.\" Copyright 2017 Nexenta Systems, Inc.
	.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
	.\"
	-.Dd May 27, 2021
	+.Dd July 25, 2021
	.Dt ZPOOL-SCRUB 8
	.Os
	.
	.Sh NAME
	.Nm zpool-scrub
	.Nd begin or resume scrub of ZFS storage pools
	.Sh SYNOPSIS
	.Nm zpool
	.Cm scrub
	.Op Fl s Ns \| Ns Fl p
	.Op Fl w
	.Ar pool Ns …
	.
	.Sh DESCRIPTION
	Begins a scrub or resumes a paused scrub.
	The scrub examines all data in the specified pools to verify that it checksums
	correctly.
	For replicated
	.Pq mirror, raidz, or draid
	devices, ZFS automatically repairs any damage discovered during the scrub.
	The
	.Nm zpool Cm status
	command reports the progress of the scrub and summarizes the results of the
	scrub upon completion.
	.Pp
	Scrubbing and resilvering are very similar operations.
	The difference is that resilvering only examines data that ZFS knows to be out
	of date
	.Po
	for example, when attaching a new device to a mirror or replacing an existing
	device
	.Pc ,
	whereas scrubbing examines all data to discover silent errors due to hardware
	faults or disk failure.
	.Pp
	Because scrubbing and resilvering are I/O-intensive operations, ZFS only allows
	one at a time.
	+.Pp
	+A scrub is split into two parts: metadata scanning and block scrubbing.
	+The metadata scanning sorts blocks into large sequential ranges which can then
	+be read much more efficiently from disk when issuing the scrub I/O.
	+.Pp
	If a scrub is paused, the
	.Nm zpool Cm scrub
	resumes it.
	If a resilver is in progress, ZFS does not allow a scrub to be started until the
	resilver completes.
	.Pp
	Note that, due to changes in pool data on a live system, it is possible for
	scrubs to progress slightly beyond 100% completion.
	During this period, no completion time estimate will be provided.
	.
	.Sh OPTIONS
	.Bl -tag -width "-s"
	.It Fl s
	Stop scrubbing.
	.It Fl p
	Pause scrubbing.
	Scrub pause state and progress are periodically synced to disk.
	If the system is restarted or pool is exported during a paused scrub,
	even after import, scrub will remain paused until it is resumed.
	Once resumed the scrub will pick up from the place where it was last
	checkpointed to disk.
	To resume a paused scrub issue
	.Nm zpool Cm scrub
	again.
	.It Fl w
	Wait until scrub has completed before returning.
	.El
	+.Sh EXAMPLES
	+.Bl -tag -width "Exam"
	+.It Sy Example 1 : Status of pool with ongoing scrub:
	+Output:
	+.Bd -literal -compact -offset Ds
	+.No # Nm zpool Cm status
	+ ...
	+ scan: scrub in progress since Sun Jul 25 16:07:49 2021
	+ 403M scanned at 100M/s, 68.4M issued at 10.0M/s, 405M total
	+ 0B repaired, 16.91% done, 00:00:04 to go
	+ ...
	+.Ed
	+Where:
	+.Bl -dash -offset indent
	+.It
	+Metadata which references 403M of file data has been
	+scanned at 100M/s, and 68.4M of that file data has been
	+scrubbed sequentially at 10.0M/s.
	+.El
	+.El
	.
	.Sh SEE ALSO
	.Xr zpool-iostat 8 ,
	.Xr zpool-resilver 8 ,
	.Xr zpool-status 8
	diff --git a/sys/contrib/openzfs/module/nvpair/nvpair.c b/sys/contrib/openzfs/module/nvpair/nvpair.c
	index 990a4482c993..5f427c8cf2e7 100644
	--- a/sys/contrib/openzfs/module/nvpair/nvpair.c
	+++ b/sys/contrib/openzfs/module/nvpair/nvpair.c
	@@ -1,3738 +1,3788 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2015, 2017 by Delphix. All rights reserved.
	* Copyright 2018 RackTop Systems.
	*/

	/*
	* Links to Illumos.org for more information on Interface Libraries:
	* [1] https://illumos.org/man/3lib/libnvpair
	* [2] https://illumos.org/man/3nvpair/nvlist_alloc
	* [3] https://illumos.org/man/9f/nvlist_alloc
	* [4] https://illumos.org/man/9f/nvlist_next_nvpair
	* [5] https://illumos.org/man/9f/nvpair_value_byte
	*/

	#include <sys/debug.h>
	#include <sys/isa_defs.h>
	#include <sys/nvpair.h>
	#include <sys/nvpair_impl.h>
	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/strings.h>
	#include <rpc/xdr.h>
	#include <sys/mod.h>

	#if defined(_KERNEL)
	#include <sys/sunddi.h>
	#include <sys/sysmacros.h>
	#else
	#include <stdarg.h>
	#include <stdlib.h>
	#include <stddef.h>
	#endif

	#define skip_whitespace(p) while (((p) == ' ') \|\| ((p) == '\t')) p++

	/*
	* nvpair.c - Provides kernel & userland interfaces for manipulating
	* name-value pairs.
	*
	* Overview Diagram
	*
	* +--------------+
	* \| nvlist_t \|
	* \|--------------\|
	* \| nvl_version \|
	* \| nvl_nvflag \|
	* \| nvl_priv -+-+
	* \| nvl_flag \| \|
	* \| nvl_pad \| \|
	* +--------------+ \|
	* V
	* +--------------+ last i_nvp in list
	* \| nvpriv_t \| +--------------------->
	* \|--------------\| \|
	* +--+- nvp_list \| \| +------------+
	* \| \| nvp_last -+--+ + nv_alloc_t \|
	* \| \| nvp_curr \| \|------------\|
	* \| \| nvp_nva -+----> \| nva_ops \|
	* \| \| nvp_stat \| \| nva_arg \|
	* \| +--------------+ +------------+
	* \|
	* +-------+
	* V
	* +---------------------+ +-------------------+
	* \| i_nvp_t \| +-->\| i_nvp_t \| +-->
	* \|---------------------\| \| \|-------------------\| \|
	* \| nvi_next -+--+ \| nvi_next -+--+
	* \| nvi_prev (NULL) \| <----+ nvi_prev \|
	* \| . . . . . . . . . . \| \| . . . . . . . . . \|
	* \| nvp (nvpair_t) \| \| nvp (nvpair_t) \|
	* \| - nvp_size \| \| - nvp_size \|
	* \| - nvp_name_sz \| \| - nvp_name_sz \|
	* \| - nvp_value_elem \| \| - nvp_value_elem \|
	* \| - nvp_type \| \| - nvp_type \|
	* \| - data ... \| \| - data ... \|
	* +---------------------+ +-------------------+
	*
	*
	*
	* +---------------------+ +---------------------+
	* \| i_nvp_t \| +--> +-->\| i_nvp_t (last) \|
	* \|---------------------\| \| \| \|---------------------\|
	* \| nvi_next -+--+ ... --+ \| nvi_next (NULL) \|
	* <-+- nvi_prev \|<-- ... <----+ nvi_prev \|
	* \| . . . . . . . . . \| \| . . . . . . . . . \|
	* \| nvp (nvpair_t) \| \| nvp (nvpair_t) \|
	* \| - nvp_size \| \| - nvp_size \|
	* \| - nvp_name_sz \| \| - nvp_name_sz \|
	* \| - nvp_value_elem \| \| - nvp_value_elem \|
	* \| - DATA_TYPE_NVLIST \| \| - nvp_type \|
	* \| - data (embedded) \| \| - data ... \|
	* \| nvlist name \| +---------------------+
	* \| +--------------+ \|
	* \| \| nvlist_t \| \|
	* \| \|--------------\| \|
	* \| \| nvl_version \| \|
	* \| \| nvl_nvflag \| \|
	* \| \| nvl_priv --+---+---->
	* \| \| nvl_flag \| \|
	* \| \| nvl_pad \| \|
	* \| +--------------+ \|
	* +---------------------+
	*
	*
	* N.B. nvpair_t may be aligned on 4 byte boundary, so +4 will
	* allow value to be aligned on 8 byte boundary
	*
	* name_len is the length of the name string including the null terminator
	* so it must be >= 1
	*/
	#define NVP_SIZE_CALC(name_len, data_len) \
	(NV_ALIGN((sizeof (nvpair_t)) + name_len) + NV_ALIGN(data_len))

	static int i_get_value_size(data_type_t type, const void *data, uint_t nelem);
	static int nvlist_add_common(nvlist_t nvl, const char name, data_type_t type,
	uint_t nelem, const void *data);

	#define NV_STAT_EMBEDDED 0x1
	#define EMBEDDED_NVL(nvp) ((nvlist_t )(void )NVP_VALUE(nvp))
	#define EMBEDDED_NVL_ARRAY(nvp) ((nvlist_t *)(void )NVP_VALUE(nvp))

	#define NVP_VALOFF(nvp) (NV_ALIGN(sizeof (nvpair_t) + (nvp)->nvp_name_sz))
	#define NVPAIR2I_NVP(nvp) \
	((i_nvp_t *)((size_t)(nvp) - offsetof(i_nvp_t, nvi_nvp)))

	#ifdef _KERNEL
	int nvpair_max_recursion = 20;
	#else
	int nvpair_max_recursion = 100;
	#endif

	uint64_t nvlist_hashtable_init_size = (1 << 4);

	int
	nv_alloc_init(nv_alloc_t nva, const nv_alloc_ops_t nvo, /* args */ ...)
	{
	va_list valist;
	int err = 0;

	nva->nva_ops = nvo;
	nva->nva_arg = NULL;

	va_start(valist, nvo);
	if (nva->nva_ops->nv_ao_init != NULL)
	err = nva->nva_ops->nv_ao_init(nva, valist);
	va_end(valist);

	return (err);
	}

	void
	nv_alloc_reset(nv_alloc_t *nva)
	{
	if (nva->nva_ops->nv_ao_reset != NULL)
	nva->nva_ops->nv_ao_reset(nva);
	}

	void
	nv_alloc_fini(nv_alloc_t *nva)
	{
	if (nva->nva_ops->nv_ao_fini != NULL)
	nva->nva_ops->nv_ao_fini(nva);
	}

	nv_alloc_t *
	nvlist_lookup_nv_alloc(nvlist_t *nvl)
	{
	nvpriv_t *priv;

	if (nvl == NULL \|\|
	(priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
	return (NULL);

	return (priv->nvp_nva);
	}

	static void *
	nv_mem_zalloc(nvpriv_t *nvp, size_t size)
	{
	nv_alloc_t *nva = nvp->nvp_nva;
	void *buf;

	if ((buf = nva->nva_ops->nv_ao_alloc(nva, size)) != NULL)
	bzero(buf, size);

	return (buf);
	}

	static void
	nv_mem_free(nvpriv_t nvp, void buf, size_t size)
	{
	nv_alloc_t *nva = nvp->nvp_nva;

	nva->nva_ops->nv_ao_free(nva, buf, size);
	}

	static void
	nv_priv_init(nvpriv_t priv, nv_alloc_t nva, uint32_t stat)
	{
	bzero(priv, sizeof (nvpriv_t));

	priv->nvp_nva = nva;
	priv->nvp_stat = stat;
	}

	static nvpriv_t *
	nv_priv_alloc(nv_alloc_t *nva)
	{
	nvpriv_t *priv;

	/*
	* nv_mem_alloc() cannot called here because it needs the priv
	* argument.
	*/
	if ((priv = nva->nva_ops->nv_ao_alloc(nva, sizeof (nvpriv_t))) == NULL)
	return (NULL);

	nv_priv_init(priv, nva, 0);

	return (priv);
	}

	/*
	* Embedded lists need their own nvpriv_t's. We create a new
	* nvpriv_t using the parameters and allocator from the parent
	* list's nvpriv_t.
	*/
	static nvpriv_t *
	nv_priv_alloc_embedded(nvpriv_t *priv)
	{
	nvpriv_t *emb_priv;

	if ((emb_priv = nv_mem_zalloc(priv, sizeof (nvpriv_t))) == NULL)
	return (NULL);

	nv_priv_init(emb_priv, priv->nvp_nva, NV_STAT_EMBEDDED);

	return (emb_priv);
	}

	static int
	nvt_tab_alloc(nvpriv_t *priv, uint64_t buckets)
	{
	ASSERT3P(priv->nvp_hashtable, ==, NULL);
	ASSERT0(priv->nvp_nbuckets);
	ASSERT0(priv->nvp_nentries);

	i_nvp_t *tab = nv_mem_zalloc(priv, buckets sizeof (i_nvp_t *));
	if (tab == NULL)
	return (ENOMEM);

	priv->nvp_hashtable = tab;
	priv->nvp_nbuckets = buckets;
	return (0);
	}

	static void
	nvt_tab_free(nvpriv_t *priv)
	{
	i_nvp_t **tab = priv->nvp_hashtable;
	if (tab == NULL) {
	ASSERT0(priv->nvp_nbuckets);
	ASSERT0(priv->nvp_nentries);
	return;
	}

	nv_mem_free(priv, tab, priv->nvp_nbuckets * sizeof (i_nvp_t *));

	priv->nvp_hashtable = NULL;
	priv->nvp_nbuckets = 0;
	priv->nvp_nentries = 0;
	}

	static uint32_t
	nvt_hash(const char *p)
	{
	uint32_t g, hval = 0;

	while (*p) {
	hval = (hval << 4) + *p++;
	if ((g = (hval & 0xf0000000)) != 0)
	hval ^= g >> 24;
	hval &= ~g;
	}
	return (hval);
	}

	static boolean_t
	nvt_nvpair_match(nvpair_t nvp1, nvpair_t nvp2, uint32_t nvflag)
	{
	boolean_t match = B_FALSE;
	if (nvflag & NV_UNIQUE_NAME_TYPE) {
	if (strcmp(NVP_NAME(nvp1), NVP_NAME(nvp2)) == 0 &&
	NVP_TYPE(nvp1) == NVP_TYPE(nvp2))
	match = B_TRUE;
	} else {
	ASSERT(nvflag == 0 \|\| nvflag & NV_UNIQUE_NAME);
	if (strcmp(NVP_NAME(nvp1), NVP_NAME(nvp2)) == 0)
	match = B_TRUE;
	}
	return (match);
	}

	static nvpair_t *
	nvt_lookup_name_type(nvlist_t nvl, const char name, data_type_t type)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;
	ASSERT(priv != NULL);

	i_nvp_t **tab = priv->nvp_hashtable;

	if (tab == NULL) {
	ASSERT3P(priv->nvp_list, ==, NULL);
	ASSERT0(priv->nvp_nbuckets);
	ASSERT0(priv->nvp_nentries);
	return (NULL);
	} else {
	ASSERT(priv->nvp_nbuckets != 0);
	}

	uint64_t hash = nvt_hash(name);
	uint64_t index = hash & (priv->nvp_nbuckets - 1);

	ASSERT3U(index, <, priv->nvp_nbuckets);
	i_nvp_t *entry = tab[index];

	for (i_nvp_t *e = entry; e != NULL; e = e->nvi_hashtable_next) {
	if (strcmp(NVP_NAME(&e->nvi_nvp), name) == 0 &&
	(type == DATA_TYPE_DONTCARE \|\|
	NVP_TYPE(&e->nvi_nvp) == type))
	return (&e->nvi_nvp);
	}
	return (NULL);
	}

	static nvpair_t *
	nvt_lookup_name(nvlist_t nvl, const char name)
	{
	return (nvt_lookup_name_type(nvl, name, DATA_TYPE_DONTCARE));
	}

	static int
	nvt_resize(nvpriv_t *priv, uint32_t new_size)
	{
	i_nvp_t **tab = priv->nvp_hashtable;

	/*
	* Migrate all the entries from the current table
	* to a newly-allocated table with the new size by
	* re-adjusting the pointers of their entries.
	*/
	uint32_t size = priv->nvp_nbuckets;
	uint32_t new_mask = new_size - 1;
	ASSERT(ISP2(new_size));

	i_nvp_t *new_tab = nv_mem_zalloc(priv, new_size sizeof (i_nvp_t *));
	if (new_tab == NULL)
	return (ENOMEM);

	uint32_t nentries = 0;
	for (uint32_t i = 0; i < size; i++) {
	i_nvp_t next, e = tab[i];

	while (e != NULL) {
	next = e->nvi_hashtable_next;

	uint32_t hash = nvt_hash(NVP_NAME(&e->nvi_nvp));
	uint32_t index = hash & new_mask;

	e->nvi_hashtable_next = new_tab[index];
	new_tab[index] = e;
	nentries++;

	e = next;
	}
	tab[i] = NULL;
	}
	ASSERT3U(nentries, ==, priv->nvp_nentries);

	nvt_tab_free(priv);

	priv->nvp_hashtable = new_tab;
	priv->nvp_nbuckets = new_size;
	priv->nvp_nentries = nentries;

	return (0);
	}

	static boolean_t
	nvt_needs_togrow(nvpriv_t *priv)
	{
	/*
	* Grow only when we have more elements than buckets
	* and the # of buckets doesn't overflow.
	*/
	return (priv->nvp_nentries > priv->nvp_nbuckets &&
	(UINT32_MAX >> 1) >= priv->nvp_nbuckets);
	}

	/*
	* Allocate a new table that's twice the size of the old one,
	* and migrate all the entries from the old one to the new
	* one by re-adjusting their pointers.
	*/
	static int
	nvt_grow(nvpriv_t *priv)
	{
	uint32_t current_size = priv->nvp_nbuckets;
	/* ensure we won't overflow */
	ASSERT3U(UINT32_MAX >> 1, >=, current_size);
	return (nvt_resize(priv, current_size << 1));
	}

	static boolean_t
	nvt_needs_toshrink(nvpriv_t *priv)
	{
	/*
	* Shrink only when the # of elements is less than or
	* equal to 1/4 the # of buckets. Never shrink less than
	* nvlist_hashtable_init_size.
	*/
	ASSERT3U(priv->nvp_nbuckets, >=, nvlist_hashtable_init_size);
	if (priv->nvp_nbuckets == nvlist_hashtable_init_size)
	return (B_FALSE);
	return (priv->nvp_nentries <= (priv->nvp_nbuckets >> 2));
	}

	/*
	* Allocate a new table that's half the size of the old one,
	* and migrate all the entries from the old one to the new
	* one by re-adjusting their pointers.
	*/
	static int
	nvt_shrink(nvpriv_t *priv)
	{
	uint32_t current_size = priv->nvp_nbuckets;
	/* ensure we won't overflow */
	ASSERT3U(current_size, >=, nvlist_hashtable_init_size);
	return (nvt_resize(priv, current_size >> 1));
	}

	static int
	nvt_remove_nvpair(nvlist_t nvl, nvpair_t nvp)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;

	if (nvt_needs_toshrink(priv)) {
	int err = nvt_shrink(priv);
	if (err != 0)
	return (err);
	}
	i_nvp_t **tab = priv->nvp_hashtable;

	char *name = NVP_NAME(nvp);
	uint64_t hash = nvt_hash(name);
	uint64_t index = hash & (priv->nvp_nbuckets - 1);

	ASSERT3U(index, <, priv->nvp_nbuckets);
	i_nvp_t *bucket = tab[index];

	for (i_nvp_t prev = NULL, e = bucket;
	e != NULL; prev = e, e = e->nvi_hashtable_next) {
	if (nvt_nvpair_match(&e->nvi_nvp, nvp, nvl->nvl_nvflag)) {
	if (prev != NULL) {
	prev->nvi_hashtable_next =
	e->nvi_hashtable_next;
	} else {
	ASSERT3P(e, ==, bucket);
	tab[index] = e->nvi_hashtable_next;
	}
	e->nvi_hashtable_next = NULL;
	priv->nvp_nentries--;
	break;
	}
	}

	return (0);
	}

	static int
	nvt_add_nvpair(nvlist_t nvl, nvpair_t nvp)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;

	/* initialize nvpair table now if it doesn't exist. */
	if (priv->nvp_hashtable == NULL) {
	int err = nvt_tab_alloc(priv, nvlist_hashtable_init_size);
	if (err != 0)
	return (err);
	}

	/*
	* if we don't allow duplicate entries, make sure to
	* unlink any existing entries from the table.
	*/
	if (nvl->nvl_nvflag != 0) {
	int err = nvt_remove_nvpair(nvl, nvp);
	if (err != 0)
	return (err);
	}

	if (nvt_needs_togrow(priv)) {
	int err = nvt_grow(priv);
	if (err != 0)
	return (err);
	}
	i_nvp_t **tab = priv->nvp_hashtable;

	char *name = NVP_NAME(nvp);
	uint64_t hash = nvt_hash(name);
	uint64_t index = hash & (priv->nvp_nbuckets - 1);

	ASSERT3U(index, <, priv->nvp_nbuckets);
	i_nvp_t *bucket = tab[index];

	/* insert link at the beginning of the bucket */
	i_nvp_t *new_entry = NVPAIR2I_NVP(nvp);
	ASSERT3P(new_entry->nvi_hashtable_next, ==, NULL);
	new_entry->nvi_hashtable_next = bucket;
	tab[index] = new_entry;

	priv->nvp_nentries++;
	return (0);
	}

	static void
	nvlist_init(nvlist_t nvl, uint32_t nvflag, nvpriv_t priv)
	{
	nvl->nvl_version = NV_VERSION;
	nvl->nvl_nvflag = nvflag & (NV_UNIQUE_NAME\|NV_UNIQUE_NAME_TYPE);
	nvl->nvl_priv = (uint64_t)(uintptr_t)priv;
	nvl->nvl_flag = 0;
	nvl->nvl_pad = 0;
	}

	uint_t
	nvlist_nvflag(nvlist_t *nvl)
	{
	return (nvl->nvl_nvflag);
	}

	static nv_alloc_t *
	nvlist_nv_alloc(int kmflag)
	{
	#if defined(_KERNEL)
	switch (kmflag) {
	case KM_SLEEP:
	return (nv_alloc_sleep);
	case KM_NOSLEEP:
	return (nv_alloc_nosleep);
	default:
	return (nv_alloc_pushpage);
	}
	#else
	return (nv_alloc_nosleep);
	#endif /* _KERNEL */
	}

	/*
	* nvlist_alloc - Allocate nvlist.
	*/
	int
	nvlist_alloc(nvlist_t **nvlp, uint_t nvflag, int kmflag)
	{
	return (nvlist_xalloc(nvlp, nvflag, nvlist_nv_alloc(kmflag)));
	}

	int
	nvlist_xalloc(nvlist_t *nvlp, uint_t nvflag, nv_alloc_t nva)
	{
	nvpriv_t *priv;

	if (nvlp == NULL \|\| nva == NULL)
	return (EINVAL);

	if ((priv = nv_priv_alloc(nva)) == NULL)
	return (ENOMEM);

	if ((*nvlp = nv_mem_zalloc(priv,
	NV_ALIGN(sizeof (nvlist_t)))) == NULL) {
	nv_mem_free(priv, priv, sizeof (nvpriv_t));
	return (ENOMEM);
	}

	nvlist_init(*nvlp, nvflag, priv);

	return (0);
	}

	/*
	* nvp_buf_alloc - Allocate i_nvp_t for storing a new nv pair.
	*/
	static nvpair_t *
	nvp_buf_alloc(nvlist_t *nvl, size_t len)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;
	i_nvp_t *buf;
	nvpair_t *nvp;
	size_t nvsize;

	/*
	* Allocate the buffer
	*/
	nvsize = len + offsetof(i_nvp_t, nvi_nvp);

	if ((buf = nv_mem_zalloc(priv, nvsize)) == NULL)
	return (NULL);

	nvp = &buf->nvi_nvp;
	nvp->nvp_size = len;

	return (nvp);
	}

	/*
	* nvp_buf_free - de-Allocate an i_nvp_t.
	*/
	static void
	nvp_buf_free(nvlist_t nvl, nvpair_t nvp)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;
	size_t nvsize = nvp->nvp_size + offsetof(i_nvp_t, nvi_nvp);

	nv_mem_free(priv, NVPAIR2I_NVP(nvp), nvsize);
	}

	/*
	* nvp_buf_link - link a new nv pair into the nvlist.
	*/
	static void
	nvp_buf_link(nvlist_t nvl, nvpair_t nvp)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;
	i_nvp_t *curr = NVPAIR2I_NVP(nvp);

	/* Put element at end of nvlist */
	if (priv->nvp_list == NULL) {
	priv->nvp_list = priv->nvp_last = curr;
	} else {
	curr->nvi_prev = priv->nvp_last;
	priv->nvp_last->nvi_next = curr;
	priv->nvp_last = curr;
	}
	}

	/*
	* nvp_buf_unlink - unlink an removed nvpair out of the nvlist.
	*/
	static void
	nvp_buf_unlink(nvlist_t nvl, nvpair_t nvp)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;
	i_nvp_t *curr = NVPAIR2I_NVP(nvp);

	/*
	* protect nvlist_next_nvpair() against walking on freed memory.
	*/
	if (priv->nvp_curr == curr)
	priv->nvp_curr = curr->nvi_next;

	if (curr == priv->nvp_list)
	priv->nvp_list = curr->nvi_next;
	else
	curr->nvi_prev->nvi_next = curr->nvi_next;

	if (curr == priv->nvp_last)
	priv->nvp_last = curr->nvi_prev;
	else
	curr->nvi_next->nvi_prev = curr->nvi_prev;
	}

	/*
	* take a nvpair type and number of elements and make sure the are valid
	*/
	static int
	i_validate_type_nelem(data_type_t type, uint_t nelem)
	{
	switch (type) {
	case DATA_TYPE_BOOLEAN:
	if (nelem != 0)
	return (EINVAL);
	break;
	case DATA_TYPE_BOOLEAN_VALUE:
	case DATA_TYPE_BYTE:
	case DATA_TYPE_INT8:
	case DATA_TYPE_UINT8:
	case DATA_TYPE_INT16:
	case DATA_TYPE_UINT16:
	case DATA_TYPE_INT32:
	case DATA_TYPE_UINT32:
	case DATA_TYPE_INT64:
	case DATA_TYPE_UINT64:
	case DATA_TYPE_STRING:
	case DATA_TYPE_HRTIME:
	case DATA_TYPE_NVLIST:
	#if !defined(_KERNEL)
	case DATA_TYPE_DOUBLE:
	#endif
	if (nelem != 1)
	return (EINVAL);
	break;
	case DATA_TYPE_BOOLEAN_ARRAY:
	case DATA_TYPE_BYTE_ARRAY:
	case DATA_TYPE_INT8_ARRAY:
	case DATA_TYPE_UINT8_ARRAY:
	case DATA_TYPE_INT16_ARRAY:
	case DATA_TYPE_UINT16_ARRAY:
	case DATA_TYPE_INT32_ARRAY:
	case DATA_TYPE_UINT32_ARRAY:
	case DATA_TYPE_INT64_ARRAY:
	case DATA_TYPE_UINT64_ARRAY:
	case DATA_TYPE_STRING_ARRAY:
	case DATA_TYPE_NVLIST_ARRAY:
	/* we allow arrays with 0 elements */
	break;
	default:
	return (EINVAL);
	}
	return (0);
	}

	/*
	* Verify nvp_name_sz and check the name string length.
	*/
	static int
	i_validate_nvpair_name(nvpair_t *nvp)
	{
	if ((nvp->nvp_name_sz <= 0) \|\|
	(nvp->nvp_size < NVP_SIZE_CALC(nvp->nvp_name_sz, 0)))
	return (EFAULT);

	/* verify the name string, make sure its terminated */
	if (NVP_NAME(nvp)[nvp->nvp_name_sz - 1] != '\0')
	return (EFAULT);

	return (strlen(NVP_NAME(nvp)) == nvp->nvp_name_sz - 1 ? 0 : EFAULT);
	}

	static int
	i_validate_nvpair_value(data_type_t type, uint_t nelem, const void *data)
	{
	switch (type) {
	case DATA_TYPE_BOOLEAN_VALUE:
	if ((boolean_t )data != B_TRUE &&
	(boolean_t )data != B_FALSE)
	return (EINVAL);
	break;
	case DATA_TYPE_BOOLEAN_ARRAY: {
	int i;

	for (i = 0; i < nelem; i++)
	if (((boolean_t *)data)[i] != B_TRUE &&
	((boolean_t *)data)[i] != B_FALSE)
	return (EINVAL);
	break;
	}
	default:
	break;
	}

	return (0);
	}

	/*
	* This function takes a pointer to what should be a nvpair and it's size
	* and then verifies that all the nvpair fields make sense and can be
	* trusted. This function is used when decoding packed nvpairs.
	*/
	static int
	i_validate_nvpair(nvpair_t *nvp)
	{
	data_type_t type = NVP_TYPE(nvp);
	int size1, size2;

	/* verify nvp_name_sz, check the name string length */
	if (i_validate_nvpair_name(nvp) != 0)
	return (EFAULT);

	if (i_validate_nvpair_value(type, NVP_NELEM(nvp), NVP_VALUE(nvp)) != 0)
	return (EFAULT);

	/*
	* verify nvp_type, nvp_value_elem, and also possibly
	* verify string values and get the value size.
	*/
	size2 = i_get_value_size(type, NVP_VALUE(nvp), NVP_NELEM(nvp));
	size1 = nvp->nvp_size - NVP_VALOFF(nvp);
	if (size2 < 0 \|\| size1 != NV_ALIGN(size2))
	return (EFAULT);

	return (0);
	}

	static int
	nvlist_copy_pairs(nvlist_t snvl, nvlist_t dnvl)
	{
	nvpriv_t *priv;
	i_nvp_t *curr;

	if ((priv = (nvpriv_t *)(uintptr_t)snvl->nvl_priv) == NULL)
	return (EINVAL);

	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next) {
	nvpair_t *nvp = &curr->nvi_nvp;
	int err;

	if ((err = nvlist_add_common(dnvl, NVP_NAME(nvp), NVP_TYPE(nvp),
	NVP_NELEM(nvp), NVP_VALUE(nvp))) != 0)
	return (err);
	}

	return (0);
	}

	/*
	* Frees all memory allocated for an nvpair (like embedded lists) with
	* the exception of the nvpair buffer itself.
	*/
	static void
	nvpair_free(nvpair_t *nvp)
	{
	switch (NVP_TYPE(nvp)) {
	case DATA_TYPE_NVLIST:
	nvlist_free(EMBEDDED_NVL(nvp));
	break;
	case DATA_TYPE_NVLIST_ARRAY: {
	nvlist_t **nvlp = EMBEDDED_NVL_ARRAY(nvp);
	int i;

	for (i = 0; i < NVP_NELEM(nvp); i++)
	if (nvlp[i] != NULL)
	nvlist_free(nvlp[i]);
	break;
	}
	default:
	break;
	}
	}

	/*
	* nvlist_free - free an unpacked nvlist
	*/
	void
	nvlist_free(nvlist_t *nvl)
	{
	nvpriv_t *priv;
	i_nvp_t *curr;

	if (nvl == NULL \|\|
	(priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
	return;

	/*
	* Unpacked nvlist are linked through i_nvp_t
	*/
	curr = priv->nvp_list;
	while (curr != NULL) {
	nvpair_t *nvp = &curr->nvi_nvp;
	curr = curr->nvi_next;

	nvpair_free(nvp);
	nvp_buf_free(nvl, nvp);
	}

	if (!(priv->nvp_stat & NV_STAT_EMBEDDED))
	nv_mem_free(priv, nvl, NV_ALIGN(sizeof (nvlist_t)));
	else
	nvl->nvl_priv = 0;

	nvt_tab_free(priv);
	nv_mem_free(priv, priv, sizeof (nvpriv_t));
	}

	static int
	nvlist_contains_nvp(nvlist_t nvl, nvpair_t nvp)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;
	i_nvp_t *curr;

	if (nvp == NULL)
	return (0);

	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next)
	if (&curr->nvi_nvp == nvp)
	return (1);

	return (0);
	}

	/*
	* Make a copy of nvlist
	*/
	int
	nvlist_dup(nvlist_t nvl, nvlist_t *nvlp, int kmflag)
	{
	return (nvlist_xdup(nvl, nvlp, nvlist_nv_alloc(kmflag)));
	}

	int
	nvlist_xdup(nvlist_t nvl, nvlist_t nvlp, nv_alloc_t nva)
	{
	int err;
	nvlist_t *ret;

	if (nvl == NULL \|\| nvlp == NULL)
	return (EINVAL);

	if ((err = nvlist_xalloc(&ret, nvl->nvl_nvflag, nva)) != 0)
	return (err);

	if ((err = nvlist_copy_pairs(nvl, ret)) != 0)
	nvlist_free(ret);
	else
	*nvlp = ret;

	return (err);
	}

	/*
	* Remove all with matching name
	*/
	int
	nvlist_remove_all(nvlist_t nvl, const char name)
	{
	int error = ENOENT;

	if (nvl == NULL \|\| name == NULL \|\| nvl->nvl_priv == 0)
	return (EINVAL);

	nvpair_t *nvp;
	while ((nvp = nvt_lookup_name(nvl, name)) != NULL) {
	VERIFY0(nvlist_remove_nvpair(nvl, nvp));
	error = 0;
	}

	return (error);
	}

	/*
	* Remove first one with matching name and type
	*/
	int
	nvlist_remove(nvlist_t nvl, const char name, data_type_t type)
	{
	if (nvl == NULL \|\| name == NULL \|\| nvl->nvl_priv == 0)
	return (EINVAL);

	nvpair_t *nvp = nvt_lookup_name_type(nvl, name, type);
	if (nvp == NULL)
	return (ENOENT);

	return (nvlist_remove_nvpair(nvl, nvp));
	}

	int
	nvlist_remove_nvpair(nvlist_t nvl, nvpair_t nvp)
	{
	if (nvl == NULL \|\| nvp == NULL)
	return (EINVAL);

	int err = nvt_remove_nvpair(nvl, nvp);
	if (err != 0)
	return (err);

	nvp_buf_unlink(nvl, nvp);
	nvpair_free(nvp);
	nvp_buf_free(nvl, nvp);
	return (0);
	}

	/*
	* This function calculates the size of an nvpair value.
	*
	* The data argument controls the behavior in case of the data types
	* DATA_TYPE_STRING and
	* DATA_TYPE_STRING_ARRAY
	* Is data == NULL then the size of the string(s) is excluded.
	*/
	static int
	i_get_value_size(data_type_t type, const void *data, uint_t nelem)
	{
	uint64_t value_sz;

	if (i_validate_type_nelem(type, nelem) != 0)
	return (-1);

	/* Calculate required size for holding value */
	switch (type) {
	case DATA_TYPE_BOOLEAN:
	value_sz = 0;
	break;
	case DATA_TYPE_BOOLEAN_VALUE:
	value_sz = sizeof (boolean_t);
	break;
	case DATA_TYPE_BYTE:
	value_sz = sizeof (uchar_t);
	break;
	case DATA_TYPE_INT8:
	value_sz = sizeof (int8_t);
	break;
	case DATA_TYPE_UINT8:
	value_sz = sizeof (uint8_t);
	break;
	case DATA_TYPE_INT16:
	value_sz = sizeof (int16_t);
	break;
	case DATA_TYPE_UINT16:
	value_sz = sizeof (uint16_t);
	break;
	case DATA_TYPE_INT32:
	value_sz = sizeof (int32_t);
	break;
	case DATA_TYPE_UINT32:
	value_sz = sizeof (uint32_t);
	break;
	case DATA_TYPE_INT64:
	value_sz = sizeof (int64_t);
	break;
	case DATA_TYPE_UINT64:
	value_sz = sizeof (uint64_t);
	break;
	#if !defined(_KERNEL)
	case DATA_TYPE_DOUBLE:
	value_sz = sizeof (double);
	break;
	#endif
	case DATA_TYPE_STRING:
	if (data == NULL)
	value_sz = 0;
	else
	value_sz = strlen(data) + 1;
	break;
	case DATA_TYPE_BOOLEAN_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (boolean_t);
	break;
	case DATA_TYPE_BYTE_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (uchar_t);
	break;
	case DATA_TYPE_INT8_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (int8_t);
	break;
	case DATA_TYPE_UINT8_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (uint8_t);
	break;
	case DATA_TYPE_INT16_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (int16_t);
	break;
	case DATA_TYPE_UINT16_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (uint16_t);
	break;
	case DATA_TYPE_INT32_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (int32_t);
	break;
	case DATA_TYPE_UINT32_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (uint32_t);
	break;
	case DATA_TYPE_INT64_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (int64_t);
	break;
	case DATA_TYPE_UINT64_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (uint64_t);
	break;
	case DATA_TYPE_STRING_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (uint64_t);

	if (data != NULL) {
	char const strs = data;
	uint_t i;

	/* no alignment requirement for strings */
	for (i = 0; i < nelem; i++) {
	if (strs[i] == NULL)
	return (-1);
	value_sz += strlen(strs[i]) + 1;
	}
	}
	break;
	case DATA_TYPE_HRTIME:
	value_sz = sizeof (hrtime_t);
	break;
	case DATA_TYPE_NVLIST:
	value_sz = NV_ALIGN(sizeof (nvlist_t));
	break;
	case DATA_TYPE_NVLIST_ARRAY:
	value_sz = (uint64_t)nelem * sizeof (uint64_t) +
	(uint64_t)nelem * NV_ALIGN(sizeof (nvlist_t));
	break;
	default:
	return (-1);
	}

	return (value_sz > INT32_MAX ? -1 : (int)value_sz);
	}

	static int
	nvlist_copy_embedded(nvlist_t nvl, nvlist_t onvl, nvlist_t *emb_nvl)
	{
	nvpriv_t *priv;
	int err;

	if ((priv = nv_priv_alloc_embedded((nvpriv_t *)(uintptr_t)
	nvl->nvl_priv)) == NULL)
	return (ENOMEM);

	nvlist_init(emb_nvl, onvl->nvl_nvflag, priv);

	if ((err = nvlist_copy_pairs(onvl, emb_nvl)) != 0) {
	nvlist_free(emb_nvl);
	emb_nvl->nvl_priv = 0;
	}

	return (err);
	}

	/*
	* nvlist_add_common - Add new <name,value> pair to nvlist
	*/
	static int
	nvlist_add_common(nvlist_t nvl, const char name,
	data_type_t type, uint_t nelem, const void *data)
	{
	nvpair_t *nvp;
	uint_t i;

	int nvp_sz, name_sz, value_sz;
	int err = 0;

	if (name == NULL \|\| nvl == NULL \|\| nvl->nvl_priv == 0)
	return (EINVAL);

	if (nelem != 0 && data == NULL)
	return (EINVAL);

	/*
	* Verify type and nelem and get the value size.
	* In case of data types DATA_TYPE_STRING and DATA_TYPE_STRING_ARRAY
	* is the size of the string(s) included.
	*/
	if ((value_sz = i_get_value_size(type, data, nelem)) < 0)
	return (EINVAL);

	if (i_validate_nvpair_value(type, nelem, data) != 0)
	return (EINVAL);

	/*
	* If we're adding an nvlist or nvlist array, ensure that we are not
	* adding the input nvlist to itself, which would cause recursion,
	* and ensure that no NULL nvlist pointers are present.
	*/
	switch (type) {
	case DATA_TYPE_NVLIST:
	if (data == nvl \|\| data == NULL)
	return (EINVAL);
	break;
	case DATA_TYPE_NVLIST_ARRAY: {
	nvlist_t onvlp = (nvlist_t )data;
	for (i = 0; i < nelem; i++) {
	if (onvlp[i] == nvl \|\| onvlp[i] == NULL)
	return (EINVAL);
	}
	break;
	}
	default:
	break;
	}

	/* calculate sizes of the nvpair elements and the nvpair itself */
	name_sz = strlen(name) + 1;
	if (name_sz >= 1ULL << (sizeof (nvp->nvp_name_sz) * NBBY - 1))
	return (EINVAL);

	nvp_sz = NVP_SIZE_CALC(name_sz, value_sz);

	if ((nvp = nvp_buf_alloc(nvl, nvp_sz)) == NULL)
	return (ENOMEM);

	ASSERT(nvp->nvp_size == nvp_sz);
	nvp->nvp_name_sz = name_sz;
	nvp->nvp_value_elem = nelem;
	nvp->nvp_type = type;
	bcopy(name, NVP_NAME(nvp), name_sz);

	switch (type) {
	case DATA_TYPE_BOOLEAN:
	break;
	case DATA_TYPE_STRING_ARRAY: {
	char const strs = data;
	char *buf = NVP_VALUE(nvp);
	char *cstrs = (void )buf;

	/* skip pre-allocated space for pointer array */
	buf += nelem * sizeof (uint64_t);
	for (i = 0; i < nelem; i++) {
	int slen = strlen(strs[i]) + 1;
	bcopy(strs[i], buf, slen);
	cstrs[i] = buf;
	buf += slen;
	}
	break;
	}
	case DATA_TYPE_NVLIST: {
	nvlist_t *nnvl = EMBEDDED_NVL(nvp);
	nvlist_t onvl = (nvlist_t )data;

	if ((err = nvlist_copy_embedded(nvl, onvl, nnvl)) != 0) {
	nvp_buf_free(nvl, nvp);
	return (err);
	}
	break;
	}
	case DATA_TYPE_NVLIST_ARRAY: {
	nvlist_t onvlp = (nvlist_t )data;
	nvlist_t **nvlp = EMBEDDED_NVL_ARRAY(nvp);
	nvlist_t embedded = (nvlist_t )
	((uintptr_t)nvlp + nelem * sizeof (uint64_t));

	for (i = 0; i < nelem; i++) {
	if ((err = nvlist_copy_embedded(nvl,
	onvlp[i], embedded)) != 0) {
	/*
	* Free any successfully created lists
	*/
	nvpair_free(nvp);
	nvp_buf_free(nvl, nvp);
	return (err);
	}

	nvlp[i] = embedded++;
	}
	break;
	}
	default:
	bcopy(data, NVP_VALUE(nvp), value_sz);
	}

	/* if unique name, remove before add */
	if (nvl->nvl_nvflag & NV_UNIQUE_NAME)
	(void) nvlist_remove_all(nvl, name);
	else if (nvl->nvl_nvflag & NV_UNIQUE_NAME_TYPE)
	(void) nvlist_remove(nvl, name, type);

	err = nvt_add_nvpair(nvl, nvp);
	if (err != 0) {
	nvpair_free(nvp);
	nvp_buf_free(nvl, nvp);
	return (err);
	}
	nvp_buf_link(nvl, nvp);

	return (0);
	}

	int
	nvlist_add_boolean(nvlist_t nvl, const char name)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_BOOLEAN, 0, NULL));
	}

	int
	nvlist_add_boolean_value(nvlist_t nvl, const char name, boolean_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_BOOLEAN_VALUE, 1, &val));
	}

	int
	nvlist_add_byte(nvlist_t nvl, const char name, uchar_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_BYTE, 1, &val));
	}

	int
	nvlist_add_int8(nvlist_t nvl, const char name, int8_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_INT8, 1, &val));
	}

	int
	nvlist_add_uint8(nvlist_t nvl, const char name, uint8_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT8, 1, &val));
	}

	int
	nvlist_add_int16(nvlist_t nvl, const char name, int16_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_INT16, 1, &val));
	}

	int
	nvlist_add_uint16(nvlist_t nvl, const char name, uint16_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT16, 1, &val));
	}

	int
	nvlist_add_int32(nvlist_t nvl, const char name, int32_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_INT32, 1, &val));
	}

	int
	nvlist_add_uint32(nvlist_t nvl, const char name, uint32_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT32, 1, &val));
	}

	int
	nvlist_add_int64(nvlist_t nvl, const char name, int64_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_INT64, 1, &val));
	}

	int
	nvlist_add_uint64(nvlist_t nvl, const char name, uint64_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT64, 1, &val));
	}

	#if !defined(_KERNEL)
	int
	nvlist_add_double(nvlist_t nvl, const char name, double val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_DOUBLE, 1, &val));
	}
	#endif

	int
	nvlist_add_string(nvlist_t nvl, const char name, const char *val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_STRING, 1, (void *)val));
	}

	int
	nvlist_add_boolean_array(nvlist_t nvl, const char name,
	boolean_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_BOOLEAN_ARRAY, n, a));
	}

	int
	nvlist_add_byte_array(nvlist_t nvl, const char name, uchar_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_BYTE_ARRAY, n, a));
	}

	int
	nvlist_add_int8_array(nvlist_t nvl, const char name, int8_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_INT8_ARRAY, n, a));
	}

	int
	nvlist_add_uint8_array(nvlist_t nvl, const char name, uint8_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT8_ARRAY, n, a));
	}

	int
	nvlist_add_int16_array(nvlist_t nvl, const char name, int16_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_INT16_ARRAY, n, a));
	}

	int
	nvlist_add_uint16_array(nvlist_t nvl, const char name, uint16_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT16_ARRAY, n, a));
	}

	int
	nvlist_add_int32_array(nvlist_t nvl, const char name, int32_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_INT32_ARRAY, n, a));
	}

	int
	nvlist_add_uint32_array(nvlist_t nvl, const char name, uint32_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT32_ARRAY, n, a));
	}

	int
	nvlist_add_int64_array(nvlist_t nvl, const char name, int64_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_INT64_ARRAY, n, a));
	}

	int
	nvlist_add_uint64_array(nvlist_t nvl, const char name, uint64_t *a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT64_ARRAY, n, a));
	}

	int
	nvlist_add_string_array(nvlist_t nvl, const char name,
	char const a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_STRING_ARRAY, n, a));
	}

	int
	nvlist_add_hrtime(nvlist_t nvl, const char name, hrtime_t val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_HRTIME, 1, &val));
	}

	int
	nvlist_add_nvlist(nvlist_t nvl, const char name, nvlist_t *val)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_NVLIST, 1, val));
	}

	int
	nvlist_add_nvlist_array(nvlist_t nvl, const char name, nvlist_t **a, uint_t n)
	{
	return (nvlist_add_common(nvl, name, DATA_TYPE_NVLIST_ARRAY, n, a));
	}

	/* reading name-value pairs */
	nvpair_t *
	nvlist_next_nvpair(nvlist_t nvl, nvpair_t nvp)
	{
	nvpriv_t *priv;
	i_nvp_t *curr;

	if (nvl == NULL \|\|
	(priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
	return (NULL);

	curr = NVPAIR2I_NVP(nvp);

	/*
	* Ensure that nvp is a valid nvpair on this nvlist.
	* NB: nvp_curr is used only as a hint so that we don't always
	* have to walk the list to determine if nvp is still on the list.
	*/
	if (nvp == NULL)
	curr = priv->nvp_list;
	else if (priv->nvp_curr == curr \|\| nvlist_contains_nvp(nvl, nvp))
	curr = curr->nvi_next;
	else
	curr = NULL;

	priv->nvp_curr = curr;

	return (curr != NULL ? &curr->nvi_nvp : NULL);
	}

	nvpair_t *
	nvlist_prev_nvpair(nvlist_t nvl, nvpair_t nvp)
	{
	nvpriv_t *priv;
	i_nvp_t *curr;

	if (nvl == NULL \|\|
	(priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
	return (NULL);

	curr = NVPAIR2I_NVP(nvp);

	if (nvp == NULL)
	curr = priv->nvp_last;
	else if (priv->nvp_curr == curr \|\| nvlist_contains_nvp(nvl, nvp))
	curr = curr->nvi_prev;
	else
	curr = NULL;

	priv->nvp_curr = curr;

	return (curr != NULL ? &curr->nvi_nvp : NULL);
	}

	boolean_t
	nvlist_empty(nvlist_t *nvl)
	{
	nvpriv_t *priv;

	if (nvl == NULL \|\|
	(priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
	return (B_TRUE);

	return (priv->nvp_list == NULL);
	}

	char *
	nvpair_name(nvpair_t *nvp)
	{
	return (NVP_NAME(nvp));
	}

	data_type_t
	nvpair_type(nvpair_t *nvp)
	{
	return (NVP_TYPE(nvp));
	}

	int
	nvpair_type_is_array(nvpair_t *nvp)
	{
	data_type_t type = NVP_TYPE(nvp);

	if ((type == DATA_TYPE_BYTE_ARRAY) \|\|
	(type == DATA_TYPE_INT8_ARRAY) \|\|
	(type == DATA_TYPE_UINT8_ARRAY) \|\|
	(type == DATA_TYPE_INT16_ARRAY) \|\|
	(type == DATA_TYPE_UINT16_ARRAY) \|\|
	(type == DATA_TYPE_INT32_ARRAY) \|\|
	(type == DATA_TYPE_UINT32_ARRAY) \|\|
	(type == DATA_TYPE_INT64_ARRAY) \|\|
	(type == DATA_TYPE_UINT64_ARRAY) \|\|
	(type == DATA_TYPE_BOOLEAN_ARRAY) \|\|
	(type == DATA_TYPE_STRING_ARRAY) \|\|
	(type == DATA_TYPE_NVLIST_ARRAY))
	return (1);
	return (0);

	}

	static int
	nvpair_value_common(nvpair_t nvp, data_type_t type, uint_t nelem, void *data)
	{
	int value_sz;

	if (nvp == NULL \|\| nvpair_type(nvp) != type)
	return (EINVAL);

	/*
	* For non-array types, we copy the data.
	* For array types (including string), we set a pointer.
	*/
	switch (type) {
	case DATA_TYPE_BOOLEAN:
	if (nelem != NULL)
	*nelem = 0;
	break;

	case DATA_TYPE_BOOLEAN_VALUE:
	case DATA_TYPE_BYTE:
	case DATA_TYPE_INT8:
	case DATA_TYPE_UINT8:
	case DATA_TYPE_INT16:
	case DATA_TYPE_UINT16:
	case DATA_TYPE_INT32:
	case DATA_TYPE_UINT32:
	case DATA_TYPE_INT64:
	case DATA_TYPE_UINT64:
	case DATA_TYPE_HRTIME:
	#if !defined(_KERNEL)
	case DATA_TYPE_DOUBLE:
	#endif
	if (data == NULL)
	return (EINVAL);
	if ((value_sz = i_get_value_size(type, NULL, 1)) < 0)
	return (EINVAL);
	bcopy(NVP_VALUE(nvp), data, (size_t)value_sz);
	if (nelem != NULL)
	*nelem = 1;
	break;

	case DATA_TYPE_NVLIST:
	case DATA_TYPE_STRING:
	if (data == NULL)
	return (EINVAL);
	(void )data = (void )NVP_VALUE(nvp);
	if (nelem != NULL)
	*nelem = 1;
	break;

	case DATA_TYPE_BOOLEAN_ARRAY:
	case DATA_TYPE_BYTE_ARRAY:
	case DATA_TYPE_INT8_ARRAY:
	case DATA_TYPE_UINT8_ARRAY:
	case DATA_TYPE_INT16_ARRAY:
	case DATA_TYPE_UINT16_ARRAY:
	case DATA_TYPE_INT32_ARRAY:
	case DATA_TYPE_UINT32_ARRAY:
	case DATA_TYPE_INT64_ARRAY:
	case DATA_TYPE_UINT64_ARRAY:
	case DATA_TYPE_STRING_ARRAY:
	case DATA_TYPE_NVLIST_ARRAY:
	if (nelem == NULL \|\| data == NULL)
	return (EINVAL);
	if ((*nelem = NVP_NELEM(nvp)) != 0)
	(void )data = (void )NVP_VALUE(nvp);
	else
	(void *)data = NULL;
	break;

	default:
	return (ENOTSUP);
	}

	return (0);
	}

	static int
	nvlist_lookup_common(nvlist_t nvl, const char name, data_type_t type,
	uint_t nelem, void data)
	{
	if (name == NULL \|\| nvl == NULL \|\| nvl->nvl_priv == 0)
	return (EINVAL);

	if (!(nvl->nvl_nvflag & (NV_UNIQUE_NAME \| NV_UNIQUE_NAME_TYPE)))
	return (ENOTSUP);

	nvpair_t *nvp = nvt_lookup_name_type(nvl, name, type);
	if (nvp == NULL)
	return (ENOENT);

	return (nvpair_value_common(nvp, type, nelem, data));
	}

	int
	nvlist_lookup_boolean(nvlist_t nvl, const char name)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_BOOLEAN, NULL, NULL));
	}

	int
	nvlist_lookup_boolean_value(nvlist_t nvl, const char name, boolean_t *val)
	{
	return (nvlist_lookup_common(nvl, name,
	DATA_TYPE_BOOLEAN_VALUE, NULL, val));
	}

	int
	nvlist_lookup_byte(nvlist_t nvl, const char name, uchar_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_BYTE, NULL, val));
	}

	int
	nvlist_lookup_int8(nvlist_t nvl, const char name, int8_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT8, NULL, val));
	}

	int
	nvlist_lookup_uint8(nvlist_t nvl, const char name, uint8_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT8, NULL, val));
	}

	int
	nvlist_lookup_int16(nvlist_t nvl, const char name, int16_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT16, NULL, val));
	}

	int
	nvlist_lookup_uint16(nvlist_t nvl, const char name, uint16_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT16, NULL, val));
	}

	int
	nvlist_lookup_int32(nvlist_t nvl, const char name, int32_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT32, NULL, val));
	}

	int
	nvlist_lookup_uint32(nvlist_t nvl, const char name, uint32_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT32, NULL, val));
	}

	int
	nvlist_lookup_int64(nvlist_t nvl, const char name, int64_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT64, NULL, val));
	}

	int
	nvlist_lookup_uint64(nvlist_t nvl, const char name, uint64_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT64, NULL, val));
	}

	#if !defined(_KERNEL)
	int
	nvlist_lookup_double(nvlist_t nvl, const char name, double *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_DOUBLE, NULL, val));
	}
	#endif

	int
	nvlist_lookup_string(nvlist_t nvl, const char name, char **val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_STRING, NULL, val));
	}

	int
	nvlist_lookup_nvlist(nvlist_t nvl, const char name, nvlist_t **val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_NVLIST, NULL, val));
	}

	int
	nvlist_lookup_boolean_array(nvlist_t nvl, const char name,
	boolean_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name,
	DATA_TYPE_BOOLEAN_ARRAY, n, a));
	}

	int
	nvlist_lookup_byte_array(nvlist_t nvl, const char name,
	uchar_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_BYTE_ARRAY, n, a));
	}

	int
	nvlist_lookup_int8_array(nvlist_t nvl, const char name, int8_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT8_ARRAY, n, a));
	}

	int
	nvlist_lookup_uint8_array(nvlist_t nvl, const char name,
	uint8_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT8_ARRAY, n, a));
	}

	int
	nvlist_lookup_int16_array(nvlist_t nvl, const char name,
	int16_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT16_ARRAY, n, a));
	}

	int
	nvlist_lookup_uint16_array(nvlist_t nvl, const char name,
	uint16_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT16_ARRAY, n, a));
	}

	int
	nvlist_lookup_int32_array(nvlist_t nvl, const char name,
	int32_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT32_ARRAY, n, a));
	}

	int
	nvlist_lookup_uint32_array(nvlist_t nvl, const char name,
	uint32_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT32_ARRAY, n, a));
	}

	int
	nvlist_lookup_int64_array(nvlist_t nvl, const char name,
	int64_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT64_ARRAY, n, a));
	}

	int
	nvlist_lookup_uint64_array(nvlist_t nvl, const char name,
	uint64_t *a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT64_ARRAY, n, a));
	}

	int
	nvlist_lookup_string_array(nvlist_t nvl, const char name,
	char **a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_STRING_ARRAY, n, a));
	}

	int
	nvlist_lookup_nvlist_array(nvlist_t nvl, const char name,
	nvlist_t **a, uint_t n)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_NVLIST_ARRAY, n, a));
	}

	int
	nvlist_lookup_hrtime(nvlist_t nvl, const char name, hrtime_t *val)
	{
	return (nvlist_lookup_common(nvl, name, DATA_TYPE_HRTIME, NULL, val));
	}

	int
	nvlist_lookup_pairs(nvlist_t *nvl, int flag, ...)
	{
	va_list ap;
	char *name;
	int noentok = (flag & NV_FLAG_NOENTOK ? 1 : 0);
	int ret = 0;

	va_start(ap, flag);
	while (ret == 0 && (name = va_arg(ap, char *)) != NULL) {
	data_type_t type;
	void *val;
	uint_t *nelem;

	switch (type = va_arg(ap, data_type_t)) {
	case DATA_TYPE_BOOLEAN:
	ret = nvlist_lookup_common(nvl, name, type, NULL, NULL);
	break;

	case DATA_TYPE_BOOLEAN_VALUE:
	case DATA_TYPE_BYTE:
	case DATA_TYPE_INT8:
	case DATA_TYPE_UINT8:
	case DATA_TYPE_INT16:
	case DATA_TYPE_UINT16:
	case DATA_TYPE_INT32:
	case DATA_TYPE_UINT32:
	case DATA_TYPE_INT64:
	case DATA_TYPE_UINT64:
	case DATA_TYPE_HRTIME:
	case DATA_TYPE_STRING:
	case DATA_TYPE_NVLIST:
	#if !defined(_KERNEL)
	case DATA_TYPE_DOUBLE:
	#endif
	val = va_arg(ap, void *);
	ret = nvlist_lookup_common(nvl, name, type, NULL, val);
	break;

	case DATA_TYPE_BYTE_ARRAY:
	case DATA_TYPE_BOOLEAN_ARRAY:
	case DATA_TYPE_INT8_ARRAY:
	case DATA_TYPE_UINT8_ARRAY:
	case DATA_TYPE_INT16_ARRAY:
	case DATA_TYPE_UINT16_ARRAY:
	case DATA_TYPE_INT32_ARRAY:
	case DATA_TYPE_UINT32_ARRAY:
	case DATA_TYPE_INT64_ARRAY:
	case DATA_TYPE_UINT64_ARRAY:
	case DATA_TYPE_STRING_ARRAY:
	case DATA_TYPE_NVLIST_ARRAY:
	val = va_arg(ap, void *);
	nelem = va_arg(ap, uint_t *);
	ret = nvlist_lookup_common(nvl, name, type, nelem, val);
	break;

	default:
	ret = EINVAL;
	}

	if (ret == ENOENT && noentok)
	ret = 0;
	}
	va_end(ap);

	return (ret);
	}

	/*
	* Find the 'name'ed nvpair in the nvlist 'nvl'. If 'name' found, the function
	* returns zero and a pointer to the matching nvpair is returned in '*ret'
	* (given 'ret' is non-NULL). If 'sep' is specified then 'name' will penitrate
	* multiple levels of embedded nvlists, with 'sep' as the separator. As an
	* example, if sep is '.', name might look like: "a" or "a.b" or "a.c[3]" or
	* "a.d[3].e[1]". This matches the C syntax for array embed (for convenience,
	* code also supports "a.d[3]e[1]" syntax).
	*
	* If 'ip' is non-NULL and the last name component is an array, return the
	* value of the "...[index]" array index in *ip. For an array reference that
	* is not indexed, *ip will be returned as -1. If there is a syntax error in
	* 'name', and 'ep' is non-NULL then *ep will be set to point to the location
	* inside the 'name' string where the syntax error was detected.
	*/
	static int
	nvlist_lookup_nvpair_ei_sep(nvlist_t nvl, const char name, const char sep,
	nvpair_t *ret, int ip, char **ep)
	{
	nvpair_t *nvp;
	const char *np;
	char *sepp = NULL;
	char idxp, idxep;
	nvlist_t **nva;
	long idx = 0;
	int n;

	if (ip)
	ip = -1; / not indexed */
	if (ep)
	*ep = NULL;

	if ((nvl == NULL) \|\| (name == NULL))
	return (EINVAL);

	sepp = NULL;
	idx = 0;
	/* step through components of name */
	for (np = name; np && *np; np = sepp) {
	/* ensure unique names */
	if (!(nvl->nvl_nvflag & NV_UNIQUE_NAME))
	return (ENOTSUP);

	/* skip white space */
	skip_whitespace(np);
	if (*np == 0)
	break;

	/* set 'sepp' to end of current component 'np' */
	if (sep)
	sepp = strchr(np, sep);
	else
	sepp = NULL;

	/* find start of next "[ index ]..." */
	idxp = strchr(np, '[');

	/* if sepp comes first, set idxp to NULL */
	if (sepp && idxp && (sepp < idxp))
	idxp = NULL;

	/*
	* At this point 'idxp' is set if there is an index
	* expected for the current component.
	*/
	if (idxp) {
	/* set 'n' to length of current 'np' name component */
	n = idxp++ - np;

	/* keep sepp up to date for ep use as we advance /
	skip_whitespace(idxp);
	sepp = idxp;

	/* determine the index value */
	#if defined(_KERNEL)
	if (ddi_strtol(idxp, &idxep, 0, &idx))
	goto fail;
	#else
	idx = strtol(idxp, &idxep, 0);
	#endif
	if (idxep == idxp)
	goto fail;

	/* keep sepp up to date for ep use as we advance /
	sepp = idxep;

	/* skip white space index value and check for ']' */
	skip_whitespace(sepp);
	if (*sepp++ != ']')
	goto fail;

	/* for embedded arrays, support C syntax: "a[1].b" */
	skip_whitespace(sepp);
	if (sep && (*sepp == sep))
	sepp++;
	} else if (sepp) {
	n = sepp++ - np;
	} else {
	n = strlen(np);
	}

	/* trim trailing whitespace by reducing length of 'np' */
	if (n == 0)
	goto fail;
	for (n--; (np[n] == ' ') \|\| (np[n] == '\t'); n--)
	;
	n++;

	/* skip whitespace, and set sepp to NULL if complete */
	if (sepp) {
	skip_whitespace(sepp);
	if (*sepp == 0)
	sepp = NULL;
	}

	/*
	* At this point:
	* o 'n' is the length of current 'np' component.
	* o 'idxp' is set if there was an index, and value 'idx'.
	* o 'sepp' is set to the beginning of the next component,
	* and set to NULL if we have no more components.
	*
	* Search for nvpair with matching component name.
	*/
	for (nvp = nvlist_next_nvpair(nvl, NULL); nvp != NULL;
	nvp = nvlist_next_nvpair(nvl, nvp)) {

	/* continue if no match on name */
	if (strncmp(np, nvpair_name(nvp), n) \|\|
	(strlen(nvpair_name(nvp)) != n))
	continue;

	/* if indexed, verify type is array oriented */
	if (idxp && !nvpair_type_is_array(nvp))
	goto fail;

	/*
	* Full match found, return nvp and idx if this
	* was the last component.
	*/
	if (sepp == NULL) {
	if (ret)
	*ret = nvp;
	if (ip && idxp)
	ip = (int)idx; / return index */
	return (0); /* found */
	}

	/*
	* More components: current match must be
	* of DATA_TYPE_NVLIST or DATA_TYPE_NVLIST_ARRAY
	* to support going deeper.
	*/
	if (nvpair_type(nvp) == DATA_TYPE_NVLIST) {
	nvl = EMBEDDED_NVL(nvp);
	break;
	} else if (nvpair_type(nvp) == DATA_TYPE_NVLIST_ARRAY) {
	(void) nvpair_value_nvlist_array(nvp,
	&nva, (uint_t *)&n);
	if ((n < 0) \|\| (idx >= n))
	goto fail;
	nvl = nva[idx];
	break;
	}

	/* type does not support more levels */
	goto fail;
	}
	if (nvp == NULL)
	goto fail; /* 'name' not found */

	/* search for match of next component in embedded 'nvl' list */
	}

	fail: if (ep && sepp)
	*ep = sepp;
	return (EINVAL);
	}

	/*
	* Return pointer to nvpair with specified 'name'.
	*/
	int
	nvlist_lookup_nvpair(nvlist_t nvl, const char name, nvpair_t **ret)
	{
	return (nvlist_lookup_nvpair_ei_sep(nvl, name, 0, ret, NULL, NULL));
	}

	/*
	* Determine if named nvpair exists in nvlist (use embedded separator of '.'
	* and return array index). See nvlist_lookup_nvpair_ei_sep for more detailed
	* description.
	*/
	int nvlist_lookup_nvpair_embedded_index(nvlist_t *nvl,
	const char name, nvpair_t ret, int ip, char **ep)
	{
	return (nvlist_lookup_nvpair_ei_sep(nvl, name, '.', ret, ip, ep));
	}

	boolean_t
	nvlist_exists(nvlist_t nvl, const char name)
	{
	nvpriv_t *priv;
	nvpair_t *nvp;
	i_nvp_t *curr;

	if (name == NULL \|\| nvl == NULL \|\|
	(priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
	return (B_FALSE);

	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next) {
	nvp = &curr->nvi_nvp;

	if (strcmp(name, NVP_NAME(nvp)) == 0)
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	int
	nvpair_value_boolean_value(nvpair_t nvp, boolean_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_BOOLEAN_VALUE, NULL, val));
	}

	int
	nvpair_value_byte(nvpair_t nvp, uchar_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_BYTE, NULL, val));
	}

	int
	nvpair_value_int8(nvpair_t nvp, int8_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_INT8, NULL, val));
	}

	int
	nvpair_value_uint8(nvpair_t nvp, uint8_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_UINT8, NULL, val));
	}

	int
	nvpair_value_int16(nvpair_t nvp, int16_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_INT16, NULL, val));
	}

	int
	nvpair_value_uint16(nvpair_t nvp, uint16_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_UINT16, NULL, val));
	}

	int
	nvpair_value_int32(nvpair_t nvp, int32_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_INT32, NULL, val));
	}

	int
	nvpair_value_uint32(nvpair_t nvp, uint32_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_UINT32, NULL, val));
	}

	int
	nvpair_value_int64(nvpair_t nvp, int64_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_INT64, NULL, val));
	}

	int
	nvpair_value_uint64(nvpair_t nvp, uint64_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_UINT64, NULL, val));
	}

	#if !defined(_KERNEL)
	int
	nvpair_value_double(nvpair_t nvp, double val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_DOUBLE, NULL, val));
	}
	#endif

	int
	nvpair_value_string(nvpair_t nvp, char *val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_STRING, NULL, val));
	}

	int
	nvpair_value_nvlist(nvpair_t nvp, nvlist_t *val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_NVLIST, NULL, val));
	}

	int
	nvpair_value_boolean_array(nvpair_t nvp, boolean_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_BOOLEAN_ARRAY, nelem, val));
	}

	int
	nvpair_value_byte_array(nvpair_t nvp, uchar_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_BYTE_ARRAY, nelem, val));
	}

	int
	nvpair_value_int8_array(nvpair_t nvp, int8_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_INT8_ARRAY, nelem, val));
	}

	int
	nvpair_value_uint8_array(nvpair_t nvp, uint8_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_UINT8_ARRAY, nelem, val));
	}

	int
	nvpair_value_int16_array(nvpair_t nvp, int16_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_INT16_ARRAY, nelem, val));
	}

	int
	nvpair_value_uint16_array(nvpair_t nvp, uint16_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_UINT16_ARRAY, nelem, val));
	}

	int
	nvpair_value_int32_array(nvpair_t nvp, int32_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_INT32_ARRAY, nelem, val));
	}

	int
	nvpair_value_uint32_array(nvpair_t nvp, uint32_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_UINT32_ARRAY, nelem, val));
	}

	int
	nvpair_value_int64_array(nvpair_t nvp, int64_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_INT64_ARRAY, nelem, val));
	}

	int
	nvpair_value_uint64_array(nvpair_t nvp, uint64_t val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_UINT64_ARRAY, nelem, val));
	}

	int
	nvpair_value_string_array(nvpair_t nvp, char *val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_STRING_ARRAY, nelem, val));
	}

	int
	nvpair_value_nvlist_array(nvpair_t nvp, nvlist_t *val, uint_t nelem)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_NVLIST_ARRAY, nelem, val));
	}

	int
	nvpair_value_hrtime(nvpair_t nvp, hrtime_t val)
	{
	return (nvpair_value_common(nvp, DATA_TYPE_HRTIME, NULL, val));
	}

	/*
	* Add specified pair to the list.
	*/
	int
	nvlist_add_nvpair(nvlist_t nvl, nvpair_t nvp)
	{
	if (nvl == NULL \|\| nvp == NULL)
	return (EINVAL);

	return (nvlist_add_common(nvl, NVP_NAME(nvp), NVP_TYPE(nvp),
	NVP_NELEM(nvp), NVP_VALUE(nvp)));
	}

	/*
	* Merge the supplied nvlists and put the result in dst.
	* The merged list will contain all names specified in both lists,
	* the values are taken from nvl in the case of duplicates.
	* Return 0 on success.
	*/
	/ARGSUSED/
	int
	nvlist_merge(nvlist_t dst, nvlist_t nvl, int flag)
	{
	if (nvl == NULL \|\| dst == NULL)
	return (EINVAL);

	if (dst != nvl)
	return (nvlist_copy_pairs(nvl, dst));

	return (0);
	}

	/*
	* Encoding related routines
	*/
	#define NVS_OP_ENCODE 0
	#define NVS_OP_DECODE 1
	#define NVS_OP_GETSIZE 2

	typedef struct nvs_ops nvs_ops_t;

	typedef struct {
	int nvs_op;
	const nvs_ops_t *nvs_ops;
	void *nvs_private;
	nvpriv_t *nvs_priv;
	int nvs_recursion;
	} nvstream_t;

	/*
	* nvs operations are:
	* - nvs_nvlist
	* encoding / decoding of an nvlist header (nvlist_t)
	* calculates the size used for header and end detection
	*
	* - nvs_nvpair
	* responsible for the first part of encoding / decoding of an nvpair
	* calculates the decoded size of an nvpair
	*
	* - nvs_nvp_op
	* second part of encoding / decoding of an nvpair
	*
	* - nvs_nvp_size
	* calculates the encoding size of an nvpair
	*
	* - nvs_nvl_fini
	* encodes the end detection mark (zeros).
	*/
	struct nvs_ops {
	int (nvs_nvlist)(nvstream_t , nvlist_t , size_t );
	int (nvs_nvpair)(nvstream_t , nvpair_t , size_t );
	int (nvs_nvp_op)(nvstream_t , nvpair_t *);
	int (nvs_nvp_size)(nvstream_t , nvpair_t , size_t );
	int (nvs_nvl_fini)(nvstream_t );
	};

	typedef struct {
	char nvh_encoding; /* nvs encoding method */
	char nvh_endian; /* nvs endian */
	char nvh_reserved1; /* reserved for future use */
	char nvh_reserved2; /* reserved for future use */
	} nvs_header_t;

	static int
	nvs_encode_pairs(nvstream_t nvs, nvlist_t nvl)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;
	i_nvp_t *curr;

	/*
	* Walk nvpair in list and encode each nvpair
	*/
	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next)
	if (nvs->nvs_ops->nvs_nvpair(nvs, &curr->nvi_nvp, NULL) != 0)
	return (EFAULT);

	return (nvs->nvs_ops->nvs_nvl_fini(nvs));
	}

	static int
	nvs_decode_pairs(nvstream_t nvs, nvlist_t nvl)
	{
	nvpair_t *nvp;
	size_t nvsize;
	int err;

	/*
	* Get decoded size of next pair in stream, alloc
	* memory for nvpair_t, then decode the nvpair
	*/
	while ((err = nvs->nvs_ops->nvs_nvpair(nvs, NULL, &nvsize)) == 0) {
	if (nvsize == 0) /* end of list */
	break;

	/* make sure len makes sense */
	if (nvsize < NVP_SIZE_CALC(1, 0))
	return (EFAULT);

	if ((nvp = nvp_buf_alloc(nvl, nvsize)) == NULL)
	return (ENOMEM);

	if ((err = nvs->nvs_ops->nvs_nvp_op(nvs, nvp)) != 0) {
	nvp_buf_free(nvl, nvp);
	return (err);
	}

	if (i_validate_nvpair(nvp) != 0) {
	nvpair_free(nvp);
	nvp_buf_free(nvl, nvp);
	return (EFAULT);
	}

	err = nvt_add_nvpair(nvl, nvp);
	if (err != 0) {
	nvpair_free(nvp);
	nvp_buf_free(nvl, nvp);
	return (err);
	}
	nvp_buf_link(nvl, nvp);
	}
	return (err);
	}

	static int
	nvs_getsize_pairs(nvstream_t nvs, nvlist_t nvl, size_t *buflen)
	{
	nvpriv_t priv = (nvpriv_t )(uintptr_t)nvl->nvl_priv;
	i_nvp_t *curr;
	uint64_t nvsize = *buflen;
	size_t size;

	/*
	* Get encoded size of nvpairs in nvlist
	*/
	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next) {
	if (nvs->nvs_ops->nvs_nvp_size(nvs, &curr->nvi_nvp, &size) != 0)
	return (EINVAL);

	if ((nvsize += size) > INT32_MAX)
	return (EINVAL);
	}

	*buflen = nvsize;
	return (0);
	}

	static int
	nvs_operation(nvstream_t nvs, nvlist_t nvl, size_t *buflen)
	{
	int err;

	if (nvl->nvl_priv == 0)
	return (EFAULT);

	/*
	* Perform the operation, starting with header, then each nvpair
	*/
	if ((err = nvs->nvs_ops->nvs_nvlist(nvs, nvl, buflen)) != 0)
	return (err);

	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	err = nvs_encode_pairs(nvs, nvl);
	break;

	case NVS_OP_DECODE:
	err = nvs_decode_pairs(nvs, nvl);
	break;

	case NVS_OP_GETSIZE:
	err = nvs_getsize_pairs(nvs, nvl, buflen);
	break;

	default:
	err = EINVAL;
	}

	return (err);
	}

	static int
	nvs_embedded(nvstream_t nvs, nvlist_t embedded)
	{
	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE: {
	int err;

	if (nvs->nvs_recursion >= nvpair_max_recursion)
	return (EINVAL);
	nvs->nvs_recursion++;
	err = nvs_operation(nvs, embedded, NULL);
	nvs->nvs_recursion--;
	return (err);
	}
	case NVS_OP_DECODE: {
	nvpriv_t *priv;
	int err;

	if (embedded->nvl_version != NV_VERSION)
	return (ENOTSUP);

	if ((priv = nv_priv_alloc_embedded(nvs->nvs_priv)) == NULL)
	return (ENOMEM);

	nvlist_init(embedded, embedded->nvl_nvflag, priv);

	if (nvs->nvs_recursion >= nvpair_max_recursion) {
	nvlist_free(embedded);
	return (EINVAL);
	}
	nvs->nvs_recursion++;
	if ((err = nvs_operation(nvs, embedded, NULL)) != 0)
	nvlist_free(embedded);
	nvs->nvs_recursion--;
	return (err);
	}
	default:
	break;
	}

	return (EINVAL);
	}

	static int
	nvs_embedded_nvl_array(nvstream_t nvs, nvpair_t nvp, size_t *size)
	{
	size_t nelem = NVP_NELEM(nvp);
	nvlist_t **nvlp = EMBEDDED_NVL_ARRAY(nvp);
	int i;

	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	for (i = 0; i < nelem; i++)
	if (nvs_embedded(nvs, nvlp[i]) != 0)
	return (EFAULT);
	break;

	case NVS_OP_DECODE: {
	size_t len = nelem * sizeof (uint64_t);
	nvlist_t embedded = (nvlist_t )((uintptr_t)nvlp + len);

	bzero(nvlp, len); /* don't trust packed data */
	for (i = 0; i < nelem; i++) {
	if (nvs_embedded(nvs, embedded) != 0) {
	nvpair_free(nvp);
	return (EFAULT);
	}

	nvlp[i] = embedded++;
	}
	break;
	}
	case NVS_OP_GETSIZE: {
	uint64_t nvsize = 0;

	for (i = 0; i < nelem; i++) {
	size_t nvp_sz = 0;

	if (nvs_operation(nvs, nvlp[i], &nvp_sz) != 0)
	return (EINVAL);

	if ((nvsize += nvp_sz) > INT32_MAX)
	return (EINVAL);
	}

	*size = nvsize;
	break;
	}
	default:
	return (EINVAL);
	}

	return (0);
	}

	static int nvs_native(nvstream_t , nvlist_t , char , size_t );
	static int nvs_xdr(nvstream_t , nvlist_t , char , size_t );

	/*
	* Common routine for nvlist operations:
	* encode, decode, getsize (encoded size).
	*/
	static int
	nvlist_common(nvlist_t nvl, char buf, size_t *buflen, int encoding,
	int nvs_op)
	{
	int err = 0;
	nvstream_t nvs;
	int nvl_endian;
	#if defined(_ZFS_LITTLE_ENDIAN)
	int host_endian = 1;
	#elif defined(_ZFS_BIG_ENDIAN)
	int host_endian = 0;
	#else
	#error "No endian defined!"
	#endif /* _ZFS_LITTLE_ENDIAN */
	nvs_header_t *nvh;

	if (buflen == NULL \|\| nvl == NULL \|\|
	(nvs.nvs_priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
	return (EINVAL);

	nvs.nvs_op = nvs_op;
	nvs.nvs_recursion = 0;

	/*
	* For NVS_OP_ENCODE and NVS_OP_DECODE make sure an nvlist and
	* a buffer is allocated. The first 4 bytes in the buffer are
	* used for encoding method and host endian.
	*/
	switch (nvs_op) {
	case NVS_OP_ENCODE:
	if (buf == NULL \|\| *buflen < sizeof (nvs_header_t))
	return (EINVAL);

	nvh = (void *)buf;
	nvh->nvh_encoding = encoding;
	nvh->nvh_endian = nvl_endian = host_endian;
	nvh->nvh_reserved1 = 0;
	nvh->nvh_reserved2 = 0;
	break;

	case NVS_OP_DECODE:
	if (buf == NULL \|\| *buflen < sizeof (nvs_header_t))
	return (EINVAL);

	/* get method of encoding from first byte */
	nvh = (void *)buf;
	encoding = nvh->nvh_encoding;
	nvl_endian = nvh->nvh_endian;
	break;

	case NVS_OP_GETSIZE:
	nvl_endian = host_endian;

	/*
	* add the size for encoding
	*/
	*buflen = sizeof (nvs_header_t);
	break;

	default:
	return (ENOTSUP);
	}

	/*
	* Create an nvstream with proper encoding method
	*/
	switch (encoding) {
	case NV_ENCODE_NATIVE:
	/*
	* check endianness, in case we are unpacking
	* from a file
	*/
	if (nvl_endian != host_endian)
	return (ENOTSUP);
	err = nvs_native(&nvs, nvl, buf, buflen);
	break;
	case NV_ENCODE_XDR:
	err = nvs_xdr(&nvs, nvl, buf, buflen);
	break;
	default:
	err = ENOTSUP;
	break;
	}

	return (err);
	}

	int
	nvlist_size(nvlist_t nvl, size_t size, int encoding)
	{
	return (nvlist_common(nvl, NULL, size, encoding, NVS_OP_GETSIZE));
	}

	/*
	* Pack nvlist into contiguous memory
	*/
	int
	nvlist_pack(nvlist_t nvl, char bufp, size_t buflen, int encoding,
	int kmflag)
	{
	return (nvlist_xpack(nvl, bufp, buflen, encoding,
	nvlist_nv_alloc(kmflag)));
	}

	int
	nvlist_xpack(nvlist_t nvl, char bufp, size_t buflen, int encoding,
	nv_alloc_t *nva)
	{
	nvpriv_t nvpriv;
	size_t alloc_size;
	char *buf;
	int err;

	if (nva == NULL \|\| nvl == NULL \|\| bufp == NULL \|\| buflen == NULL)
	return (EINVAL);

	if (*bufp != NULL)
	return (nvlist_common(nvl, *bufp, buflen, encoding,
	NVS_OP_ENCODE));

	/*
	* Here is a difficult situation:
	* 1. The nvlist has fixed allocator properties.
	* All other nvlist routines (like nvlist_add_*, ...) use
	* these properties.
	* 2. When using nvlist_pack() the user can specify their own
	* allocator properties (e.g. by using KM_NOSLEEP).
	*
	* We use the user specified properties (2). A clearer solution
	* will be to remove the kmflag from nvlist_pack(), but we will
	* not change the interface.
	*/
	nv_priv_init(&nvpriv, nva, 0);

	if ((err = nvlist_size(nvl, &alloc_size, encoding)))
	return (err);

	if ((buf = nv_mem_zalloc(&nvpriv, alloc_size)) == NULL)
	return (ENOMEM);

	if ((err = nvlist_common(nvl, buf, &alloc_size, encoding,
	NVS_OP_ENCODE)) != 0) {
	nv_mem_free(&nvpriv, buf, alloc_size);
	} else {
	*buflen = alloc_size;
	*bufp = buf;
	}

	return (err);
	}

	/*
	* Unpack buf into an nvlist_t
	*/
	int
	nvlist_unpack(char buf, size_t buflen, nvlist_t *nvlp, int kmflag)
	{
	return (nvlist_xunpack(buf, buflen, nvlp, nvlist_nv_alloc(kmflag)));
	}

	int
	nvlist_xunpack(char buf, size_t buflen, nvlist_t nvlp, nv_alloc_t nva)
	{
	nvlist_t *nvl;
	int err;

	if (nvlp == NULL)
	return (EINVAL);

	if ((err = nvlist_xalloc(&nvl, 0, nva)) != 0)
	return (err);

	if ((err = nvlist_common(nvl, buf, &buflen, NV_ENCODE_NATIVE,
	NVS_OP_DECODE)) != 0)
	nvlist_free(nvl);
	else
	*nvlp = nvl;

	return (err);
	}

	/*
	* Native encoding functions
	*/
	typedef struct {
	/*
	* This structure is used when decoding a packed nvpair in
	* the native format. n_base points to a buffer containing the
	* packed nvpair. n_end is a pointer to the end of the buffer.
	* (n_end actually points to the first byte past the end of the
	* buffer.) n_curr is a pointer that lies between n_base and n_end.
	* It points to the current data that we are decoding.
	* The amount of data left in the buffer is equal to n_end - n_curr.
	* n_flag is used to recognize a packed embedded list.
	*/
	caddr_t n_base;
	caddr_t n_end;
	caddr_t n_curr;
	uint_t n_flag;
	} nvs_native_t;

	static int
	nvs_native_create(nvstream_t nvs, nvs_native_t native, char *buf,
	size_t buflen)
	{
	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	case NVS_OP_DECODE:
	nvs->nvs_private = native;
	native->n_curr = native->n_base = buf;
	native->n_end = buf + buflen;
	native->n_flag = 0;
	return (0);

	case NVS_OP_GETSIZE:
	nvs->nvs_private = native;
	native->n_curr = native->n_base = native->n_end = NULL;
	native->n_flag = 0;
	return (0);
	default:
	return (EINVAL);
	}
	}

	/ARGSUSED/
	static void
	nvs_native_destroy(nvstream_t *nvs)
	{
	}

	static int
	native_cp(nvstream_t nvs, void buf, size_t size)
	{
	nvs_native_t native = (nvs_native_t )nvs->nvs_private;

	if (native->n_curr + size > native->n_end)
	return (EFAULT);

	/*
	* The bcopy() below eliminates alignment requirement
	* on the buffer (stream) and is preferred over direct access.
	*/
	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	bcopy(buf, native->n_curr, size);
	break;
	case NVS_OP_DECODE:
	bcopy(native->n_curr, buf, size);
	break;
	default:
	return (EINVAL);
	}

	native->n_curr += size;
	return (0);
	}

	/*
	* operate on nvlist_t header
	*/
	static int
	nvs_native_nvlist(nvstream_t nvs, nvlist_t nvl, size_t *size)
	{
	nvs_native_t *native = nvs->nvs_private;

	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	case NVS_OP_DECODE:
	if (native->n_flag)
	return (0); /* packed embedded list */

	native->n_flag = 1;

	/* copy version and nvflag of the nvlist_t */
	if (native_cp(nvs, &nvl->nvl_version, sizeof (int32_t)) != 0 \|\|
	native_cp(nvs, &nvl->nvl_nvflag, sizeof (int32_t)) != 0)
	return (EFAULT);

	return (0);

	case NVS_OP_GETSIZE:
	/*
	* if calculate for packed embedded list
	* 4 for end of the embedded list
	* else
	* 2 * sizeof (int32_t) for nvl_version and nvl_nvflag
	* and 4 for end of the entire list
	*/
	if (native->n_flag) {
	*size += 4;
	} else {
	native->n_flag = 1;
	size += 2 sizeof (int32_t) + 4;
	}

	return (0);

	default:
	return (EINVAL);
	}
	}

	static int
	nvs_native_nvl_fini(nvstream_t *nvs)
	{
	if (nvs->nvs_op == NVS_OP_ENCODE) {
	nvs_native_t native = (nvs_native_t )nvs->nvs_private;
	/*
	* Add 4 zero bytes at end of nvlist. They are used
	* for end detection by the decode routine.
	*/
	if (native->n_curr + sizeof (int) > native->n_end)
	return (EFAULT);

	bzero(native->n_curr, sizeof (int));
	native->n_curr += sizeof (int);
	}

	return (0);
	}

	static int
	nvpair_native_embedded(nvstream_t nvs, nvpair_t nvp)
	{
	if (nvs->nvs_op == NVS_OP_ENCODE) {
	nvs_native_t native = (nvs_native_t )nvs->nvs_private;
	nvlist_t packed = (void )
	(native->n_curr - nvp->nvp_size + NVP_VALOFF(nvp));
	/*
	* Null out the pointer that is meaningless in the packed
	* structure. The address may not be aligned, so we have
	* to use bzero.
	*/
	bzero((char *)packed + offsetof(nvlist_t, nvl_priv),
	sizeof (uint64_t));
	}

	return (nvs_embedded(nvs, EMBEDDED_NVL(nvp)));
	}

	static int
	nvpair_native_embedded_array(nvstream_t nvs, nvpair_t nvp)
	{
	if (nvs->nvs_op == NVS_OP_ENCODE) {
	nvs_native_t native = (nvs_native_t )nvs->nvs_private;
	char *value = native->n_curr - nvp->nvp_size + NVP_VALOFF(nvp);
	size_t len = NVP_NELEM(nvp) * sizeof (uint64_t);
	nvlist_t packed = (nvlist_t )((uintptr_t)value + len);
	int i;
	/*
	* Null out pointers that are meaningless in the packed
	* structure. The addresses may not be aligned, so we have
	* to use bzero.
	*/
	bzero(value, len);

	for (i = 0; i < NVP_NELEM(nvp); i++, packed++)
	/*
	* Null out the pointer that is meaningless in the
	* packed structure. The address may not be aligned,
	* so we have to use bzero.
	*/
	bzero((char *)packed + offsetof(nvlist_t, nvl_priv),
	sizeof (uint64_t));
	}

	return (nvs_embedded_nvl_array(nvs, nvp, NULL));
	}

	static void
	nvpair_native_string_array(nvstream_t nvs, nvpair_t nvp)
	{
	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE: {
	nvs_native_t native = (nvs_native_t )nvs->nvs_private;
	uint64_t strp = (void )
	(native->n_curr - nvp->nvp_size + NVP_VALOFF(nvp));
	/*
	* Null out pointers that are meaningless in the packed
	* structure. The addresses may not be aligned, so we have
	* to use bzero.
	*/
	bzero(strp, NVP_NELEM(nvp) * sizeof (uint64_t));
	break;
	}
	case NVS_OP_DECODE: {
	char *strp = (void )NVP_VALUE(nvp);
	char buf = ((char )strp + NVP_NELEM(nvp) * sizeof (uint64_t));
	int i;

	for (i = 0; i < NVP_NELEM(nvp); i++) {
	strp[i] = buf;
	buf += strlen(buf) + 1;
	}
	break;
	}
	}
	}

	static int
	nvs_native_nvp_op(nvstream_t nvs, nvpair_t nvp)
	{
	data_type_t type;
	int value_sz;
	int ret = 0;

	/*
	* We do the initial bcopy of the data before we look at
	* the nvpair type, because when we're decoding, we won't
	* have the correct values for the pair until we do the bcopy.
	*/
	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	case NVS_OP_DECODE:
	if (native_cp(nvs, nvp, nvp->nvp_size) != 0)
	return (EFAULT);
	break;
	default:
	return (EINVAL);
	}

	/* verify nvp_name_sz, check the name string length */
	if (i_validate_nvpair_name(nvp) != 0)
	return (EFAULT);

	type = NVP_TYPE(nvp);

	/*
	* Verify type and nelem and get the value size.
	* In case of data types DATA_TYPE_STRING and DATA_TYPE_STRING_ARRAY
	* is the size of the string(s) excluded.
	*/
	if ((value_sz = i_get_value_size(type, NULL, NVP_NELEM(nvp))) < 0)
	return (EFAULT);

	if (NVP_SIZE_CALC(nvp->nvp_name_sz, value_sz) > nvp->nvp_size)
	return (EFAULT);

	switch (type) {
	case DATA_TYPE_NVLIST:
	ret = nvpair_native_embedded(nvs, nvp);
	break;
	case DATA_TYPE_NVLIST_ARRAY:
	ret = nvpair_native_embedded_array(nvs, nvp);
	break;
	case DATA_TYPE_STRING_ARRAY:
	nvpair_native_string_array(nvs, nvp);
	break;
	default:
	break;
	}

	return (ret);
	}

	static int
	nvs_native_nvp_size(nvstream_t nvs, nvpair_t nvp, size_t *size)
	{
	uint64_t nvp_sz = nvp->nvp_size;

	switch (NVP_TYPE(nvp)) {
	case DATA_TYPE_NVLIST: {
	size_t nvsize = 0;

	if (nvs_operation(nvs, EMBEDDED_NVL(nvp), &nvsize) != 0)
	return (EINVAL);

	nvp_sz += nvsize;
	break;
	}
	case DATA_TYPE_NVLIST_ARRAY: {
	size_t nvsize;

	if (nvs_embedded_nvl_array(nvs, nvp, &nvsize) != 0)
	return (EINVAL);

	nvp_sz += nvsize;
	break;
	}
	default:
	break;
	}

	if (nvp_sz > INT32_MAX)
	return (EINVAL);

	*size = nvp_sz;

	return (0);
	}

	static int
	nvs_native_nvpair(nvstream_t nvs, nvpair_t nvp, size_t *size)
	{
	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	return (nvs_native_nvp_op(nvs, nvp));

	case NVS_OP_DECODE: {
	nvs_native_t native = (nvs_native_t )nvs->nvs_private;
	int32_t decode_len;

	/* try to read the size value from the stream */
	if (native->n_curr + sizeof (int32_t) > native->n_end)
	return (EFAULT);
	bcopy(native->n_curr, &decode_len, sizeof (int32_t));

	/* sanity check the size value */
	if (decode_len < 0 \|\|
	decode_len > native->n_end - native->n_curr)
	return (EFAULT);

	*size = decode_len;

	/*
	* If at the end of the stream then move the cursor
	* forward, otherwise nvpair_native_op() will read
	* the entire nvpair at the same cursor position.
	*/
	if (*size == 0)
	native->n_curr += sizeof (int32_t);
	break;
	}

	default:
	return (EINVAL);
	}

	return (0);
	}

	static const nvs_ops_t nvs_native_ops = {
	.nvs_nvlist = nvs_native_nvlist,
	.nvs_nvpair = nvs_native_nvpair,
	.nvs_nvp_op = nvs_native_nvp_op,
	.nvs_nvp_size = nvs_native_nvp_size,
	.nvs_nvl_fini = nvs_native_nvl_fini
	};

	static int
	nvs_native(nvstream_t nvs, nvlist_t nvl, char buf, size_t buflen)
	{
	nvs_native_t native;
	int err;

	nvs->nvs_ops = &nvs_native_ops;

	if ((err = nvs_native_create(nvs, &native, buf + sizeof (nvs_header_t),
	*buflen - sizeof (nvs_header_t))) != 0)
	return (err);

	err = nvs_operation(nvs, nvl, buflen);

	nvs_native_destroy(nvs);

	return (err);
	}

	/*
	* XDR encoding functions
	*
	* An xdr packed nvlist is encoded as:
	*
	* - encoding method and host endian (4 bytes)
	* - nvl_version (4 bytes)
	* - nvl_nvflag (4 bytes)
	*
	* - encoded nvpairs, the format of one xdr encoded nvpair is:
	* - encoded size of the nvpair (4 bytes)
	* - decoded size of the nvpair (4 bytes)
	* - name string, (4 + sizeof(NV_ALIGN4(string))
	* a string is coded as size (4 bytes) and data
	* - data type (4 bytes)
	* - number of elements in the nvpair (4 bytes)
	* - data
	*
	* - 2 zero's for end of the entire list (8 bytes)
	*/
	static int
	nvs_xdr_create(nvstream_t nvs, XDR xdr, char *buf, size_t buflen)
	{
	/* xdr data must be 4 byte aligned */
	if ((ulong_t)buf % 4 != 0)
	return (EFAULT);

	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	xdrmem_create(xdr, buf, (uint_t)buflen, XDR_ENCODE);
	nvs->nvs_private = xdr;
	return (0);
	case NVS_OP_DECODE:
	xdrmem_create(xdr, buf, (uint_t)buflen, XDR_DECODE);
	nvs->nvs_private = xdr;
	return (0);
	case NVS_OP_GETSIZE:
	nvs->nvs_private = NULL;
	return (0);
	default:
	return (EINVAL);
	}
	}

	static void
	nvs_xdr_destroy(nvstream_t *nvs)
	{
	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	case NVS_OP_DECODE:
	xdr_destroy((XDR *)nvs->nvs_private);
	break;
	default:
	break;
	}
	}

	static int
	nvs_xdr_nvlist(nvstream_t nvs, nvlist_t nvl, size_t *size)
	{
	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE:
	case NVS_OP_DECODE: {
	XDR *xdr = nvs->nvs_private;

	if (!xdr_int(xdr, &nvl->nvl_version) \|\|
	!xdr_u_int(xdr, &nvl->nvl_nvflag))
	return (EFAULT);
	break;
	}
	case NVS_OP_GETSIZE: {
	/*
	* 2 * 4 for nvl_version + nvl_nvflag
	* and 8 for end of the entire list
	*/
	size += 2 4 + 8;
	break;
	}
	default:
	return (EINVAL);
	}
	return (0);
	}

	static int
	nvs_xdr_nvl_fini(nvstream_t *nvs)
	{
	if (nvs->nvs_op == NVS_OP_ENCODE) {
	XDR *xdr = nvs->nvs_private;
	int zero = 0;

	if (!xdr_int(xdr, &zero) \|\| !xdr_int(xdr, &zero))
	return (EFAULT);
	}

	return (0);
	}

	+/*
	+ * xdrproc_t-compatible callbacks for xdr_array()
	+ */
	+
	+#if defined(_KERNEL) && defined(__linux__) /* Linux kernel */
	+
	+#define NVS_BUILD_XDRPROC_T(type) \
	+static bool_t \
	+nvs_xdr_nvp_##type(XDR xdrs, void ptr) \
	+{ \
	+ return (xdr_##type(xdrs, ptr)); \
	+}
	+
	+#elif !defined(_KERNEL) && defined(XDR_CONTROL) /* tirpc */
	+
	+#define NVS_BUILD_XDRPROC_T(type) \
	+static bool_t \
	+nvs_xdr_nvp_##type(XDR *xdrs, ...) \
	+{ \
	+ va_list args; \
	+ void *ptr; \
	+ \
	+ va_start(args, xdrs); \
	+ ptr = va_arg(args, void *); \
	+ va_end(args); \
	+ \
	+ return (xdr_##type(xdrs, ptr)); \
	+}
	+
	+#else /* FreeBSD, sunrpc */
	+
	+#define NVS_BUILD_XDRPROC_T(type) \
	+static bool_t \
	+nvs_xdr_nvp_##type(XDR xdrs, void ptr, ...) \
	+{ \
	+ return (xdr_##type(xdrs, ptr)); \
	+}
	+
	+#endif
	+
	+/* BEGIN CSTYLED */
	+NVS_BUILD_XDRPROC_T(char);
	+NVS_BUILD_XDRPROC_T(short);
	+NVS_BUILD_XDRPROC_T(u_short);
	+NVS_BUILD_XDRPROC_T(int);
	+NVS_BUILD_XDRPROC_T(u_int);
	+NVS_BUILD_XDRPROC_T(longlong_t);
	+NVS_BUILD_XDRPROC_T(u_longlong_t);
	+/* END CSTYLED */
	+
	/*
	* The format of xdr encoded nvpair is:
	* encode_size, decode_size, name string, data type, nelem, data
	*/
	static int
	nvs_xdr_nvp_op(nvstream_t nvs, nvpair_t nvp)
	{
	data_type_t type;
	char *buf;
	char buf_end = (char )nvp + nvp->nvp_size;
	int value_sz;
	uint_t nelem, buflen;
	bool_t ret = FALSE;
	XDR *xdr = nvs->nvs_private;

	ASSERT(xdr != NULL && nvp != NULL);

	/* name string */
	if ((buf = NVP_NAME(nvp)) >= buf_end)
	return (EFAULT);
	buflen = buf_end - buf;

	if (!xdr_string(xdr, &buf, buflen - 1))
	return (EFAULT);
	nvp->nvp_name_sz = strlen(buf) + 1;

	/* type and nelem */
	if (!xdr_int(xdr, (int *)&nvp->nvp_type) \|\|
	!xdr_int(xdr, &nvp->nvp_value_elem))
	return (EFAULT);

	type = NVP_TYPE(nvp);
	nelem = nvp->nvp_value_elem;

	/*
	* Verify type and nelem and get the value size.
	* In case of data types DATA_TYPE_STRING and DATA_TYPE_STRING_ARRAY
	* is the size of the string(s) excluded.
	*/
	if ((value_sz = i_get_value_size(type, NULL, nelem)) < 0)
	return (EFAULT);

	/* if there is no data to extract then return */
	if (nelem == 0)
	return (0);

	/* value */
	if ((buf = NVP_VALUE(nvp)) >= buf_end)
	return (EFAULT);
	buflen = buf_end - buf;

	if (buflen < value_sz)
	return (EFAULT);

	switch (type) {
	case DATA_TYPE_NVLIST:
	if (nvs_embedded(nvs, (void *)buf) == 0)
	return (0);
	break;

	case DATA_TYPE_NVLIST_ARRAY:
	if (nvs_embedded_nvl_array(nvs, nvp, NULL) == 0)
	return (0);
	break;

	case DATA_TYPE_BOOLEAN:
	ret = TRUE;
	break;

	case DATA_TYPE_BYTE:
	case DATA_TYPE_INT8:
	case DATA_TYPE_UINT8:
	ret = xdr_char(xdr, buf);
	break;

	case DATA_TYPE_INT16:
	ret = xdr_short(xdr, (void *)buf);
	break;

	case DATA_TYPE_UINT16:
	ret = xdr_u_short(xdr, (void *)buf);
	break;

	case DATA_TYPE_BOOLEAN_VALUE:
	case DATA_TYPE_INT32:
	ret = xdr_int(xdr, (void *)buf);
	break;

	case DATA_TYPE_UINT32:
	ret = xdr_u_int(xdr, (void *)buf);
	break;

	case DATA_TYPE_INT64:
	ret = xdr_longlong_t(xdr, (void *)buf);
	break;

	case DATA_TYPE_UINT64:
	ret = xdr_u_longlong_t(xdr, (void *)buf);
	break;

	case DATA_TYPE_HRTIME:
	/*
	* NOTE: must expose the definition of hrtime_t here
	*/
	ret = xdr_longlong_t(xdr, (void *)buf);
	break;
	#if !defined(_KERNEL)
	case DATA_TYPE_DOUBLE:
	ret = xdr_double(xdr, (void *)buf);
	break;
	#endif
	case DATA_TYPE_STRING:
	ret = xdr_string(xdr, &buf, buflen - 1);
	break;

	case DATA_TYPE_BYTE_ARRAY:
	ret = xdr_opaque(xdr, buf, nelem);
	break;

	case DATA_TYPE_INT8_ARRAY:
	case DATA_TYPE_UINT8_ARRAY:
	ret = xdr_array(xdr, &buf, &nelem, buflen, sizeof (int8_t),
	- (xdrproc_t)xdr_char);
	+ nvs_xdr_nvp_char);
	break;

	case DATA_TYPE_INT16_ARRAY:
	ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (int16_t),
	- sizeof (int16_t), (xdrproc_t)xdr_short);
	+ sizeof (int16_t), nvs_xdr_nvp_short);
	break;

	case DATA_TYPE_UINT16_ARRAY:
	ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (uint16_t),
	- sizeof (uint16_t), (xdrproc_t)xdr_u_short);
	+ sizeof (uint16_t), nvs_xdr_nvp_u_short);
	break;

	case DATA_TYPE_BOOLEAN_ARRAY:
	case DATA_TYPE_INT32_ARRAY:
	ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (int32_t),
	- sizeof (int32_t), (xdrproc_t)xdr_int);
	+ sizeof (int32_t), nvs_xdr_nvp_int);
	break;

	case DATA_TYPE_UINT32_ARRAY:
	ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (uint32_t),
	- sizeof (uint32_t), (xdrproc_t)xdr_u_int);
	+ sizeof (uint32_t), nvs_xdr_nvp_u_int);
	break;

	case DATA_TYPE_INT64_ARRAY:
	ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (int64_t),
	- sizeof (int64_t), (xdrproc_t)xdr_longlong_t);
	+ sizeof (int64_t), nvs_xdr_nvp_longlong_t);
	break;

	case DATA_TYPE_UINT64_ARRAY:
	ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (uint64_t),
	- sizeof (uint64_t), (xdrproc_t)xdr_u_longlong_t);
	+ sizeof (uint64_t), nvs_xdr_nvp_u_longlong_t);
	break;

	case DATA_TYPE_STRING_ARRAY: {
	size_t len = nelem * sizeof (uint64_t);
	char *strp = (void )buf;
	int i;

	if (nvs->nvs_op == NVS_OP_DECODE)
	bzero(buf, len); /* don't trust packed data */

	for (i = 0; i < nelem; i++) {
	if (buflen <= len)
	return (EFAULT);

	buf += len;
	buflen -= len;

	if (xdr_string(xdr, &buf, buflen - 1) != TRUE)
	return (EFAULT);

	if (nvs->nvs_op == NVS_OP_DECODE)
	strp[i] = buf;
	len = strlen(buf) + 1;
	}
	ret = TRUE;
	break;
	}
	default:
	break;
	}

	return (ret == TRUE ? 0 : EFAULT);
	}

	static int
	nvs_xdr_nvp_size(nvstream_t nvs, nvpair_t nvp, size_t *size)
	{
	data_type_t type = NVP_TYPE(nvp);
	/*
	* encode_size + decode_size + name string size + data type + nelem
	* where name string size = 4 + NV_ALIGN4(strlen(NVP_NAME(nvp)))
	*/
	uint64_t nvp_sz = 4 + 4 + 4 + NV_ALIGN4(strlen(NVP_NAME(nvp))) + 4 + 4;

	switch (type) {
	case DATA_TYPE_BOOLEAN:
	break;

	case DATA_TYPE_BOOLEAN_VALUE:
	case DATA_TYPE_BYTE:
	case DATA_TYPE_INT8:
	case DATA_TYPE_UINT8:
	case DATA_TYPE_INT16:
	case DATA_TYPE_UINT16:
	case DATA_TYPE_INT32:
	case DATA_TYPE_UINT32:
	nvp_sz += 4; /* 4 is the minimum xdr unit */
	break;

	case DATA_TYPE_INT64:
	case DATA_TYPE_UINT64:
	case DATA_TYPE_HRTIME:
	#if !defined(_KERNEL)
	case DATA_TYPE_DOUBLE:
	#endif
	nvp_sz += 8;
	break;

	case DATA_TYPE_STRING:
	nvp_sz += 4 + NV_ALIGN4(strlen((char *)NVP_VALUE(nvp)));
	break;

	case DATA_TYPE_BYTE_ARRAY:
	nvp_sz += NV_ALIGN4(NVP_NELEM(nvp));
	break;

	case DATA_TYPE_BOOLEAN_ARRAY:
	case DATA_TYPE_INT8_ARRAY:
	case DATA_TYPE_UINT8_ARRAY:
	case DATA_TYPE_INT16_ARRAY:
	case DATA_TYPE_UINT16_ARRAY:
	case DATA_TYPE_INT32_ARRAY:
	case DATA_TYPE_UINT32_ARRAY:
	nvp_sz += 4 + 4 * (uint64_t)NVP_NELEM(nvp);
	break;

	case DATA_TYPE_INT64_ARRAY:
	case DATA_TYPE_UINT64_ARRAY:
	nvp_sz += 4 + 8 * (uint64_t)NVP_NELEM(nvp);
	break;

	case DATA_TYPE_STRING_ARRAY: {
	int i;
	char *strs = (void )NVP_VALUE(nvp);

	for (i = 0; i < NVP_NELEM(nvp); i++)
	nvp_sz += 4 + NV_ALIGN4(strlen(strs[i]));

	break;
	}

	case DATA_TYPE_NVLIST:
	case DATA_TYPE_NVLIST_ARRAY: {
	size_t nvsize = 0;
	int old_nvs_op = nvs->nvs_op;
	int err;

	nvs->nvs_op = NVS_OP_GETSIZE;
	if (type == DATA_TYPE_NVLIST)
	err = nvs_operation(nvs, EMBEDDED_NVL(nvp), &nvsize);
	else
	err = nvs_embedded_nvl_array(nvs, nvp, &nvsize);
	nvs->nvs_op = old_nvs_op;

	if (err != 0)
	return (EINVAL);

	nvp_sz += nvsize;
	break;
	}

	default:
	return (EINVAL);
	}

	if (nvp_sz > INT32_MAX)
	return (EINVAL);

	*size = nvp_sz;

	return (0);
	}


	/*
	* The NVS_XDR_MAX_LEN macro takes a packed xdr buffer of size x and estimates
	* the largest nvpair that could be encoded in the buffer.
	*
	* See comments above nvpair_xdr_op() for the format of xdr encoding.
	* The size of a xdr packed nvpair without any data is 5 words.
	*
	* Using the size of the data directly as an estimate would be ok
	* in all cases except one. If the data type is of DATA_TYPE_STRING_ARRAY
	* then the actual nvpair has space for an array of pointers to index
	* the strings. These pointers are not encoded into the packed xdr buffer.
	*
	* If the data is of type DATA_TYPE_STRING_ARRAY and all the strings are
	* of length 0, then each string is encoded in xdr format as a single word.
	* Therefore when expanded to an nvpair there will be 2.25 word used for
	* each string. (a int64_t allocated for pointer usage, and a single char
	* for the null termination.)
	*
	* This is the calculation performed by the NVS_XDR_MAX_LEN macro.
	*/
	#define NVS_XDR_HDR_LEN ((size_t)(5 * 4))
	#define NVS_XDR_DATA_LEN(y) (((size_t)(y) <= NVS_XDR_HDR_LEN) ? \
	0 : ((size_t)(y) - NVS_XDR_HDR_LEN))
	#define NVS_XDR_MAX_LEN(x) (NVP_SIZE_CALC(1, 0) + \
	(NVS_XDR_DATA_LEN(x) * 2) + \
	NV_ALIGN4((NVS_XDR_DATA_LEN(x) / 4)))

	static int
	nvs_xdr_nvpair(nvstream_t nvs, nvpair_t nvp, size_t *size)
	{
	XDR *xdr = nvs->nvs_private;
	int32_t encode_len, decode_len;

	switch (nvs->nvs_op) {
	case NVS_OP_ENCODE: {
	size_t nvsize;

	if (nvs_xdr_nvp_size(nvs, nvp, &nvsize) != 0)
	return (EFAULT);

	decode_len = nvp->nvp_size;
	encode_len = nvsize;
	if (!xdr_int(xdr, &encode_len) \|\| !xdr_int(xdr, &decode_len))
	return (EFAULT);

	return (nvs_xdr_nvp_op(nvs, nvp));
	}
	case NVS_OP_DECODE: {
	struct xdr_bytesrec bytesrec;

	/* get the encode and decode size */
	if (!xdr_int(xdr, &encode_len) \|\| !xdr_int(xdr, &decode_len))
	return (EFAULT);
	*size = decode_len;

	/* are we at the end of the stream? */
	if (*size == 0)
	return (0);

	/* sanity check the size parameter */
	if (!xdr_control(xdr, XDR_GET_BYTES_AVAIL, &bytesrec))
	return (EFAULT);

	if (*size > NVS_XDR_MAX_LEN(bytesrec.xc_num_avail))
	return (EFAULT);
	break;
	}

	default:
	return (EINVAL);
	}
	return (0);
	}

	static const struct nvs_ops nvs_xdr_ops = {
	.nvs_nvlist = nvs_xdr_nvlist,
	.nvs_nvpair = nvs_xdr_nvpair,
	.nvs_nvp_op = nvs_xdr_nvp_op,
	.nvs_nvp_size = nvs_xdr_nvp_size,
	.nvs_nvl_fini = nvs_xdr_nvl_fini
	};

	static int
	nvs_xdr(nvstream_t nvs, nvlist_t nvl, char buf, size_t buflen)
	{
	XDR xdr;
	int err;

	nvs->nvs_ops = &nvs_xdr_ops;

	if ((err = nvs_xdr_create(nvs, &xdr, buf + sizeof (nvs_header_t),
	*buflen - sizeof (nvs_header_t))) != 0)
	return (err);

	err = nvs_operation(nvs, nvl, buflen);

	nvs_xdr_destroy(nvs);

	return (err);
	}

	#if defined(_KERNEL)
	static int __init
	nvpair_init(void)
	{
	return (0);
	}

	static void __exit
	nvpair_fini(void)
	{
	}

	module_init(nvpair_init);
	module_exit(nvpair_fini);
	#endif

	ZFS_MODULE_DESCRIPTION("Generic name/value pair implementation");
	ZFS_MODULE_AUTHOR(ZFS_META_AUTHOR);
	ZFS_MODULE_LICENSE(ZFS_META_LICENSE);
	ZFS_MODULE_VERSION(ZFS_META_VERSION "-" ZFS_META_RELEASE);

	EXPORT_SYMBOL(nv_alloc_init);
	EXPORT_SYMBOL(nv_alloc_reset);
	EXPORT_SYMBOL(nv_alloc_fini);

	/* list management */
	EXPORT_SYMBOL(nvlist_alloc);
	EXPORT_SYMBOL(nvlist_free);
	EXPORT_SYMBOL(nvlist_size);
	EXPORT_SYMBOL(nvlist_pack);
	EXPORT_SYMBOL(nvlist_unpack);
	EXPORT_SYMBOL(nvlist_dup);
	EXPORT_SYMBOL(nvlist_merge);

	EXPORT_SYMBOL(nvlist_xalloc);
	EXPORT_SYMBOL(nvlist_xpack);
	EXPORT_SYMBOL(nvlist_xunpack);
	EXPORT_SYMBOL(nvlist_xdup);
	EXPORT_SYMBOL(nvlist_lookup_nv_alloc);

	EXPORT_SYMBOL(nvlist_add_nvpair);
	EXPORT_SYMBOL(nvlist_add_boolean);
	EXPORT_SYMBOL(nvlist_add_boolean_value);
	EXPORT_SYMBOL(nvlist_add_byte);
	EXPORT_SYMBOL(nvlist_add_int8);
	EXPORT_SYMBOL(nvlist_add_uint8);
	EXPORT_SYMBOL(nvlist_add_int16);
	EXPORT_SYMBOL(nvlist_add_uint16);
	EXPORT_SYMBOL(nvlist_add_int32);
	EXPORT_SYMBOL(nvlist_add_uint32);
	EXPORT_SYMBOL(nvlist_add_int64);
	EXPORT_SYMBOL(nvlist_add_uint64);
	EXPORT_SYMBOL(nvlist_add_string);
	EXPORT_SYMBOL(nvlist_add_nvlist);
	EXPORT_SYMBOL(nvlist_add_boolean_array);
	EXPORT_SYMBOL(nvlist_add_byte_array);
	EXPORT_SYMBOL(nvlist_add_int8_array);
	EXPORT_SYMBOL(nvlist_add_uint8_array);
	EXPORT_SYMBOL(nvlist_add_int16_array);
	EXPORT_SYMBOL(nvlist_add_uint16_array);
	EXPORT_SYMBOL(nvlist_add_int32_array);
	EXPORT_SYMBOL(nvlist_add_uint32_array);
	EXPORT_SYMBOL(nvlist_add_int64_array);
	EXPORT_SYMBOL(nvlist_add_uint64_array);
	EXPORT_SYMBOL(nvlist_add_string_array);
	EXPORT_SYMBOL(nvlist_add_nvlist_array);
	EXPORT_SYMBOL(nvlist_next_nvpair);
	EXPORT_SYMBOL(nvlist_prev_nvpair);
	EXPORT_SYMBOL(nvlist_empty);
	EXPORT_SYMBOL(nvlist_add_hrtime);

	EXPORT_SYMBOL(nvlist_remove);
	EXPORT_SYMBOL(nvlist_remove_nvpair);
	EXPORT_SYMBOL(nvlist_remove_all);

	EXPORT_SYMBOL(nvlist_lookup_boolean);
	EXPORT_SYMBOL(nvlist_lookup_boolean_value);
	EXPORT_SYMBOL(nvlist_lookup_byte);
	EXPORT_SYMBOL(nvlist_lookup_int8);
	EXPORT_SYMBOL(nvlist_lookup_uint8);
	EXPORT_SYMBOL(nvlist_lookup_int16);
	EXPORT_SYMBOL(nvlist_lookup_uint16);
	EXPORT_SYMBOL(nvlist_lookup_int32);
	EXPORT_SYMBOL(nvlist_lookup_uint32);
	EXPORT_SYMBOL(nvlist_lookup_int64);
	EXPORT_SYMBOL(nvlist_lookup_uint64);
	EXPORT_SYMBOL(nvlist_lookup_string);
	EXPORT_SYMBOL(nvlist_lookup_nvlist);
	EXPORT_SYMBOL(nvlist_lookup_boolean_array);
	EXPORT_SYMBOL(nvlist_lookup_byte_array);
	EXPORT_SYMBOL(nvlist_lookup_int8_array);
	EXPORT_SYMBOL(nvlist_lookup_uint8_array);
	EXPORT_SYMBOL(nvlist_lookup_int16_array);
	EXPORT_SYMBOL(nvlist_lookup_uint16_array);
	EXPORT_SYMBOL(nvlist_lookup_int32_array);
	EXPORT_SYMBOL(nvlist_lookup_uint32_array);
	EXPORT_SYMBOL(nvlist_lookup_int64_array);
	EXPORT_SYMBOL(nvlist_lookup_uint64_array);
	EXPORT_SYMBOL(nvlist_lookup_string_array);
	EXPORT_SYMBOL(nvlist_lookup_nvlist_array);
	EXPORT_SYMBOL(nvlist_lookup_hrtime);
	EXPORT_SYMBOL(nvlist_lookup_pairs);

	EXPORT_SYMBOL(nvlist_lookup_nvpair);
	EXPORT_SYMBOL(nvlist_exists);

	/* processing nvpair */
	EXPORT_SYMBOL(nvpair_name);
	EXPORT_SYMBOL(nvpair_type);
	EXPORT_SYMBOL(nvpair_value_boolean_value);
	EXPORT_SYMBOL(nvpair_value_byte);
	EXPORT_SYMBOL(nvpair_value_int8);
	EXPORT_SYMBOL(nvpair_value_uint8);
	EXPORT_SYMBOL(nvpair_value_int16);
	EXPORT_SYMBOL(nvpair_value_uint16);
	EXPORT_SYMBOL(nvpair_value_int32);
	EXPORT_SYMBOL(nvpair_value_uint32);
	EXPORT_SYMBOL(nvpair_value_int64);
	EXPORT_SYMBOL(nvpair_value_uint64);
	EXPORT_SYMBOL(nvpair_value_string);
	EXPORT_SYMBOL(nvpair_value_nvlist);
	EXPORT_SYMBOL(nvpair_value_boolean_array);
	EXPORT_SYMBOL(nvpair_value_byte_array);
	EXPORT_SYMBOL(nvpair_value_int8_array);
	EXPORT_SYMBOL(nvpair_value_uint8_array);
	EXPORT_SYMBOL(nvpair_value_int16_array);
	EXPORT_SYMBOL(nvpair_value_uint16_array);
	EXPORT_SYMBOL(nvpair_value_int32_array);
	EXPORT_SYMBOL(nvpair_value_uint32_array);
	EXPORT_SYMBOL(nvpair_value_int64_array);
	EXPORT_SYMBOL(nvpair_value_uint64_array);
	EXPORT_SYMBOL(nvpair_value_string_array);
	EXPORT_SYMBOL(nvpair_value_nvlist_array);
	EXPORT_SYMBOL(nvpair_value_hrtime);
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/acl_common.c b/sys/contrib/openzfs/module/os/freebsd/spl/acl_common.c
	index 66e27cefa396..7fd0e36e1ba7 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/acl_common.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/acl_common.c
	@@ -1,1709 +1,1709 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	*/

	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/avl.h>
	#include <sys/misc.h>
	#if defined(_KERNEL)
	#include <sys/kmem.h>
	#include <sys/systm.h>
	#include <sys/sysmacros.h>
	#include <acl/acl_common.h>
	#include <sys/debug.h>
	#else
	#include <errno.h>
	#include <stdlib.h>
	#include <stddef.h>
	#include <strings.h>
	#include <unistd.h>
	#include <assert.h>
	#include <grp.h>
	#include <pwd.h>
	#include <acl_common.h>
	-#define ASSERT assert
	#endif

	#define ACE_POSIX_SUPPORTED_BITS (ACE_READ_DATA \| \
	ACE_WRITE_DATA \| ACE_APPEND_DATA \| ACE_EXECUTE \| \
	ACE_READ_ATTRIBUTES \| ACE_READ_ACL \| ACE_WRITE_ACL)


	#define ACL_SYNCHRONIZE_SET_DENY 0x0000001
	#define ACL_SYNCHRONIZE_SET_ALLOW 0x0000002
	#define ACL_SYNCHRONIZE_ERR_DENY 0x0000004
	#define ACL_SYNCHRONIZE_ERR_ALLOW 0x0000008

	#define ACL_WRITE_OWNER_SET_DENY 0x0000010
	#define ACL_WRITE_OWNER_SET_ALLOW 0x0000020
	#define ACL_WRITE_OWNER_ERR_DENY 0x0000040
	#define ACL_WRITE_OWNER_ERR_ALLOW 0x0000080

	#define ACL_DELETE_SET_DENY 0x0000100
	#define ACL_DELETE_SET_ALLOW 0x0000200
	#define ACL_DELETE_ERR_DENY 0x0000400
	#define ACL_DELETE_ERR_ALLOW 0x0000800

	#define ACL_WRITE_ATTRS_OWNER_SET_DENY 0x0001000
	#define ACL_WRITE_ATTRS_OWNER_SET_ALLOW 0x0002000
	#define ACL_WRITE_ATTRS_OWNER_ERR_DENY 0x0004000
	#define ACL_WRITE_ATTRS_OWNER_ERR_ALLOW 0x0008000

	#define ACL_WRITE_ATTRS_WRITER_SET_DENY 0x0010000
	#define ACL_WRITE_ATTRS_WRITER_SET_ALLOW 0x0020000
	#define ACL_WRITE_ATTRS_WRITER_ERR_DENY 0x0040000
	#define ACL_WRITE_ATTRS_WRITER_ERR_ALLOW 0x0080000

	#define ACL_WRITE_NAMED_WRITER_SET_DENY 0x0100000
	#define ACL_WRITE_NAMED_WRITER_SET_ALLOW 0x0200000
	#define ACL_WRITE_NAMED_WRITER_ERR_DENY 0x0400000
	#define ACL_WRITE_NAMED_WRITER_ERR_ALLOW 0x0800000

	#define ACL_READ_NAMED_READER_SET_DENY 0x1000000
	#define ACL_READ_NAMED_READER_SET_ALLOW 0x2000000
	#define ACL_READ_NAMED_READER_ERR_DENY 0x4000000
	#define ACL_READ_NAMED_READER_ERR_ALLOW 0x8000000


	#define ACE_VALID_MASK_BITS (\
	ACE_READ_DATA \| \
	ACE_LIST_DIRECTORY \| \
	ACE_WRITE_DATA \| \
	ACE_ADD_FILE \| \
	ACE_APPEND_DATA \| \
	ACE_ADD_SUBDIRECTORY \| \
	ACE_READ_NAMED_ATTRS \| \
	ACE_WRITE_NAMED_ATTRS \| \
	ACE_EXECUTE \| \
	ACE_DELETE_CHILD \| \
	ACE_READ_ATTRIBUTES \| \
	ACE_WRITE_ATTRIBUTES \| \
	ACE_DELETE \| \
	ACE_READ_ACL \| \
	ACE_WRITE_ACL \| \
	ACE_WRITE_OWNER \| \
	ACE_SYNCHRONIZE)

	#define ACE_MASK_UNDEFINED 0x80000000

	#define ACE_VALID_FLAG_BITS (ACE_FILE_INHERIT_ACE \| \
	ACE_DIRECTORY_INHERIT_ACE \| \
	ACE_NO_PROPAGATE_INHERIT_ACE \| ACE_INHERIT_ONLY_ACE \| \
	ACE_SUCCESSFUL_ACCESS_ACE_FLAG \| ACE_FAILED_ACCESS_ACE_FLAG \| \
	ACE_IDENTIFIER_GROUP \| ACE_OWNER \| ACE_GROUP \| ACE_EVERYONE)

	/*
	* ACL conversion helpers
	*/

	typedef enum {
	ace_unused,
	ace_user_obj,
	ace_user,
	ace_group, /* includes GROUP and GROUP_OBJ */
	ace_other_obj
	} ace_to_aent_state_t;

	typedef struct acevals {
	uid_t key;
	avl_node_t avl;
	uint32_t mask;
	uint32_t allowed;
	uint32_t denied;
	int aent_type;
	} acevals_t;

	typedef struct ace_list {
	acevals_t user_obj;
	avl_tree_t user;
	int numusers;
	acevals_t group_obj;
	avl_tree_t group;
	int numgroups;
	acevals_t other_obj;
	uint32_t acl_mask;
	int hasmask;
	int dfacl_flag;
	ace_to_aent_state_t state;
	int seen; /* bitmask of all aclent_t a_type values seen */
	} ace_list_t;

	/*
	* Generic shellsort, from K&R (1st ed, p 58.), somewhat modified.
	* v = Ptr to array/vector of objs
	* n = # objs in the array
	* s = size of each obj (must be multiples of a word size)
	* f = ptr to function to compare two objs
	* returns (-1 = less than, 0 = equal, 1 = greater than
	*/
	void
	ksort(caddr_t v, int n, int s, int (f)(void , void *))
	{
	int g, i, j, ii;
	unsigned int p1, p2;
	unsigned int tmp;

	/* No work to do */
	if (v == NULL \|\| n <= 1)
	return;

	/* Sanity check on arguments */
	- ASSERT(((uintptr_t)v & 0x3) == 0 && (s & 0x3) == 0);
	- ASSERT(s > 0);
	+ ASSERT3U(((uintptr_t)v & 0x3), ==, 0);
	+ ASSERT3S((s & 0x3), ==, 0);
	+ ASSERT3S(s, >, 0);
	for (g = n / 2; g > 0; g /= 2) {
	for (i = g; i < n; i++) {
	for (j = i - g; j >= 0 &&
	(f)(v + j s, v + (j + g) * s) == 1;
	j -= g) {
	p1 = (void )(v + j s);
	p2 = (void )(v + (j + g) s);
	for (ii = 0; ii < s / 4; ii++) {
	tmp = *p1;
	p1++ = p2;
	*p2++ = tmp;
	}
	}
	}
	}
	}

	/*
	* Compare two acls, all fields. Returns:
	* -1 (less than)
	* 0 (equal)
	* +1 (greater than)
	*/
	int
	cmp2acls(void a, void b)
	{
	aclent_t x = (aclent_t )a;
	aclent_t y = (aclent_t )b;

	/* Compare types */
	if (x->a_type < y->a_type)
	return (-1);
	if (x->a_type > y->a_type)
	return (1);
	/* Equal types; compare id's */
	if (x->a_id < y->a_id)
	return (-1);
	if (x->a_id > y->a_id)
	return (1);
	/* Equal ids; compare perms */
	if (x->a_perm < y->a_perm)
	return (-1);
	if (x->a_perm > y->a_perm)
	return (1);
	/* Totally equal */
	return (0);
	}

	static int
	cacl_malloc(void **ptr, size_t size)
	{
	*ptr = kmem_zalloc(size, KM_SLEEP);
	return (0);
	}


	#if !defined(_KERNEL)
	acl_t *
	acl_alloc(enum acl_type type)
	{
	acl_t *aclp;

	if (cacl_malloc((void **)&aclp, sizeof (acl_t)) != 0)
	return (NULL);

	aclp->acl_aclp = NULL;
	aclp->acl_cnt = 0;

	switch (type) {
	case ACE_T:
	aclp->acl_type = ACE_T;
	aclp->acl_entry_size = sizeof (ace_t);
	break;
	case ACLENT_T:
	aclp->acl_type = ACLENT_T;
	aclp->acl_entry_size = sizeof (aclent_t);
	break;
	default:
	acl_free(aclp);
	aclp = NULL;
	}
	return (aclp);
	}

	/*
	* Free acl_t structure
	*/
	void
	acl_free(acl_t *aclp)
	{
	int acl_size;

	if (aclp == NULL)
	return;

	if (aclp->acl_aclp) {
	acl_size = aclp->acl_cnt * aclp->acl_entry_size;
	cacl_free(aclp->acl_aclp, acl_size);
	}

	cacl_free(aclp, sizeof (acl_t));
	}

	static uint32_t
	access_mask_set(int haswriteperm, int hasreadperm, int isowner, int isallow)
	{
	uint32_t access_mask = 0;
	int acl_produce;
	int synchronize_set = 0, write_owner_set = 0;
	int delete_set = 0, write_attrs_set = 0;
	int read_named_set = 0, write_named_set = 0;

	acl_produce = (ACL_SYNCHRONIZE_SET_ALLOW \|
	ACL_WRITE_ATTRS_OWNER_SET_ALLOW \|
	ACL_WRITE_ATTRS_WRITER_SET_DENY);

	if (isallow) {
	synchronize_set = ACL_SYNCHRONIZE_SET_ALLOW;
	write_owner_set = ACL_WRITE_OWNER_SET_ALLOW;
	delete_set = ACL_DELETE_SET_ALLOW;
	if (hasreadperm)
	read_named_set = ACL_READ_NAMED_READER_SET_ALLOW;
	if (haswriteperm)
	write_named_set = ACL_WRITE_NAMED_WRITER_SET_ALLOW;
	if (isowner)
	write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_ALLOW;
	else if (haswriteperm)
	write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_ALLOW;
	} else {

	synchronize_set = ACL_SYNCHRONIZE_SET_DENY;
	write_owner_set = ACL_WRITE_OWNER_SET_DENY;
	delete_set = ACL_DELETE_SET_DENY;
	if (hasreadperm)
	read_named_set = ACL_READ_NAMED_READER_SET_DENY;
	if (haswriteperm)
	write_named_set = ACL_WRITE_NAMED_WRITER_SET_DENY;
	if (isowner)
	write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_DENY;
	else if (haswriteperm)
	write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_DENY;
	else
	/*
	* If the entity is not the owner and does not
	* have write permissions ACE_WRITE_ATTRIBUTES will
	* always go in the DENY ACE.
	*/
	access_mask \|= ACE_WRITE_ATTRIBUTES;
	}

	if (acl_produce & synchronize_set)
	access_mask \|= ACE_SYNCHRONIZE;
	if (acl_produce & write_owner_set)
	access_mask \|= ACE_WRITE_OWNER;
	if (acl_produce & delete_set)
	access_mask \|= ACE_DELETE;
	if (acl_produce & write_attrs_set)
	access_mask \|= ACE_WRITE_ATTRIBUTES;
	if (acl_produce & read_named_set)
	access_mask \|= ACE_READ_NAMED_ATTRS;
	if (acl_produce & write_named_set)
	access_mask \|= ACE_WRITE_NAMED_ATTRS;

	return (access_mask);
	}

	/*
	* Given an mode_t, convert it into an access_mask as used
	* by nfsace, assuming aclent_t -> nfsace semantics.
	*/
	static uint32_t
	mode_to_ace_access(mode_t mode, boolean_t isdir, int isowner, int isallow)
	{
	uint32_t access = 0;
	int haswriteperm = 0;
	int hasreadperm = 0;

	if (isallow) {
	haswriteperm = (mode & S_IWOTH);
	hasreadperm = (mode & S_IROTH);
	} else {
	haswriteperm = !(mode & S_IWOTH);
	hasreadperm = !(mode & S_IROTH);
	}

	/*
	* The following call takes care of correctly setting the following
	* mask bits in the access_mask:
	* ACE_SYNCHRONIZE, ACE_WRITE_OWNER, ACE_DELETE,
	* ACE_WRITE_ATTRIBUTES, ACE_WRITE_NAMED_ATTRS, ACE_READ_NAMED_ATTRS
	*/
	access = access_mask_set(haswriteperm, hasreadperm, isowner, isallow);

	if (isallow) {
	access \|= ACE_READ_ACL \| ACE_READ_ATTRIBUTES;
	if (isowner)
	access \|= ACE_WRITE_ACL;
	} else {
	if (! isowner)
	access \|= ACE_WRITE_ACL;
	}

	/* read */
	if (mode & S_IROTH) {
	access \|= ACE_READ_DATA;
	}
	/* write */
	if (mode & S_IWOTH) {
	access \|= ACE_WRITE_DATA \|
	ACE_APPEND_DATA;
	if (isdir)
	access \|= ACE_DELETE_CHILD;
	}
	/* exec */
	if (mode & S_IXOTH) {
	access \|= ACE_EXECUTE;
	}

	return (access);
	}

	/*
	* Given an nfsace (presumably an ALLOW entry), make a
	* corresponding DENY entry at the address given.
	*/
	static void
	ace_make_deny(ace_t allow, ace_t deny, int isdir, int isowner)
	{
	(void) memcpy(deny, allow, sizeof (ace_t));

	deny->a_who = allow->a_who;

	deny->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
	deny->a_access_mask ^= ACE_POSIX_SUPPORTED_BITS;
	if (isdir)
	deny->a_access_mask ^= ACE_DELETE_CHILD;

	deny->a_access_mask &= ~(ACE_SYNCHRONIZE \| ACE_WRITE_OWNER \|
	ACE_DELETE \| ACE_WRITE_ATTRIBUTES \| ACE_READ_NAMED_ATTRS \|
	ACE_WRITE_NAMED_ATTRS);
	deny->a_access_mask \|= access_mask_set((allow->a_access_mask &
	ACE_WRITE_DATA), (allow->a_access_mask & ACE_READ_DATA), isowner,
	B_FALSE);
	}
	/*
	* Make an initial pass over an array of aclent_t's. Gather
	* information such as an ACL_MASK (if any), number of users,
	* number of groups, and whether the array needs to be sorted.
	*/
	static int
	ln_aent_preprocess(aclent_t *aclent, int n,
	int hasmask, mode_t mask,
	int numuser, int numgroup, int *needsort)
	{
	int error = 0;
	int i;
	int curtype = 0;

	*hasmask = 0;
	*mask = 07;
	*needsort = 0;
	*numuser = 0;
	*numgroup = 0;

	for (i = 0; i < n; i++) {
	if (aclent[i].a_type < curtype)
	*needsort = 1;
	else if (aclent[i].a_type > curtype)
	curtype = aclent[i].a_type;
	if (aclent[i].a_type & USER)
	(*numuser)++;
	if (aclent[i].a_type & (GROUP \| GROUP_OBJ))
	(*numgroup)++;
	if (aclent[i].a_type & CLASS_OBJ) {
	if (*hasmask) {
	error = EINVAL;
	goto out;
	} else {
	*hasmask = 1;
	*mask = aclent[i].a_perm;
	}
	}
	}

	if ((! hasmask) && (numuser + *numgroup > 1)) {
	error = EINVAL;
	goto out;
	}

	out:
	return (error);
	}

	/*
	* Convert an array of aclent_t into an array of nfsace entries,
	* following POSIX draft -> nfsv4 conversion semantics as outlined in
	* the IETF draft.
	*/
	static int
	ln_aent_to_ace(aclent_t aclent, int n, ace_t acepp, int rescount, int isdir)
	{
	int error = 0;
	mode_t mask;
	int numuser, numgroup, needsort;
	int resultsize = 0;
	int i, groupi = 0, skip;
	ace_t acep, result = NULL;
	int hasmask;

	error = ln_aent_preprocess(aclent, n, &hasmask, &mask,
	&numuser, &numgroup, &needsort);
	if (error != 0)
	goto out;

	/* allow + deny for each aclent */
	resultsize = n * 2;
	if (hasmask) {
	/*
	* stick extra deny on the group_obj and on each
	* user\|group for the mask (the group_obj was added
	* into the count for numgroup)
	*/
	resultsize += numuser + numgroup;
	/* ... and don't count the mask itself */
	resultsize -= 2;
	}

	/* sort the source if necessary */
	if (needsort)
	ksort((caddr_t)aclent, n, sizeof (aclent_t), cmp2acls);

	if (cacl_malloc((void *)&result, resultsize sizeof (ace_t)) != 0)
	goto out;

	acep = result;

	for (i = 0; i < n; i++) {
	/*
	* don't process CLASS_OBJ (mask); mask was grabbed in
	* ln_aent_preprocess()
	*/
	if (aclent[i].a_type & CLASS_OBJ)
	continue;

	/* If we need an ACL_MASK emulator, prepend it now */
	if ((hasmask) &&
	(aclent[i].a_type & (USER \| GROUP \| GROUP_OBJ))) {
	acep->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
	acep->a_flags = 0;
	if (aclent[i].a_type & GROUP_OBJ) {
	acep->a_who = (uid_t)-1;
	acep->a_flags \|=
	(ACE_IDENTIFIER_GROUP\|ACE_GROUP);
	} else if (aclent[i].a_type & USER) {
	acep->a_who = aclent[i].a_id;
	} else {
	acep->a_who = aclent[i].a_id;
	acep->a_flags \|= ACE_IDENTIFIER_GROUP;
	}
	if (aclent[i].a_type & ACL_DEFAULT) {
	acep->a_flags \|= ACE_INHERIT_ONLY_ACE \|
	ACE_FILE_INHERIT_ACE \|
	ACE_DIRECTORY_INHERIT_ACE;
	}
	/*
	* Set the access mask for the prepended deny
	* ace. To do this, we invert the mask (found
	* in ln_aent_preprocess()) then convert it to an
	* DENY ace access_mask.
	*/
	acep->a_access_mask = mode_to_ace_access((mask ^ 07),
	isdir, 0, 0);
	acep += 1;
	}

	/* handle a_perm -> access_mask */
	acep->a_access_mask = mode_to_ace_access(aclent[i].a_perm,
	isdir, aclent[i].a_type & USER_OBJ, 1);

	/* emulate a default aclent */
	if (aclent[i].a_type & ACL_DEFAULT) {
	acep->a_flags \|= ACE_INHERIT_ONLY_ACE \|
	ACE_FILE_INHERIT_ACE \|
	ACE_DIRECTORY_INHERIT_ACE;
	}

	/*
	* handle a_perm and a_id
	*
	* this must be done last, since it involves the
	* corresponding deny aces, which are handled
	* differently for each different a_type.
	*/
	if (aclent[i].a_type & USER_OBJ) {
	acep->a_who = (uid_t)-1;
	acep->a_flags \|= ACE_OWNER;
	ace_make_deny(acep, acep + 1, isdir, B_TRUE);
	acep += 2;
	} else if (aclent[i].a_type & USER) {
	acep->a_who = aclent[i].a_id;
	ace_make_deny(acep, acep + 1, isdir, B_FALSE);
	acep += 2;
	} else if (aclent[i].a_type & (GROUP_OBJ \| GROUP)) {
	if (aclent[i].a_type & GROUP_OBJ) {
	acep->a_who = (uid_t)-1;
	acep->a_flags \|= ACE_GROUP;
	} else {
	acep->a_who = aclent[i].a_id;
	}
	acep->a_flags \|= ACE_IDENTIFIER_GROUP;
	/*
	* Set the corresponding deny for the group ace.
	*
	* The deny aces go after all of the groups, unlike
	* everything else, where they immediately follow
	* the allow ace.
	*
	* We calculate "skip", the number of slots to
	* skip ahead for the deny ace, here.
	*
	* The pattern is:
	* MD1 A1 MD2 A2 MD3 A3 D1 D2 D3
	* thus, skip is
	* (2 * numgroup) - 1 - groupi
	* (2 * numgroup) to account for MD + A
	* - 1 to account for the fact that we're on the
	* access (A), not the mask (MD)
	* - groupi to account for the fact that we have
	* passed up groupi number of MD's.
	*/
	skip = (2 * numgroup) - 1 - groupi;
	ace_make_deny(acep, acep + skip, isdir, B_FALSE);
	/*
	* If we just did the last group, skip acep past
	* all of the denies; else, just move ahead one.
	*/
	if (++groupi >= numgroup)
	acep += numgroup + 1;
	else
	acep += 1;
	} else if (aclent[i].a_type & OTHER_OBJ) {
	acep->a_who = (uid_t)-1;
	acep->a_flags \|= ACE_EVERYONE;
	ace_make_deny(acep, acep + 1, isdir, B_FALSE);
	acep += 2;
	} else {
	error = EINVAL;
	goto out;
	}
	}

	*acepp = result;
	*rescount = resultsize;

	out:
	if (error != 0) {
	if ((result != NULL) && (resultsize > 0)) {
	cacl_free(result, resultsize * sizeof (ace_t));
	}
	}

	return (error);
	}

	static int
	convert_aent_to_ace(aclent_t *aclentp, int aclcnt, boolean_t isdir,
	ace_t *retacep, int retacecnt)
	{
	ace_t *acep;
	ace_t *dfacep;
	int acecnt = 0;
	int dfacecnt = 0;
	int dfaclstart = 0;
	int dfaclcnt = 0;
	aclent_t *aclp;
	int i;
	int error;
	int acesz, dfacesz;

	ksort((caddr_t)aclentp, aclcnt, sizeof (aclent_t), cmp2acls);

	for (i = 0, aclp = aclentp; i < aclcnt; aclp++, i++) {
	if (aclp->a_type & ACL_DEFAULT)
	break;
	}

	if (i < aclcnt) {
	dfaclstart = i;
	dfaclcnt = aclcnt - i;
	}

	if (dfaclcnt && !isdir) {
	return (EINVAL);
	}

	error = ln_aent_to_ace(aclentp, i, &acep, &acecnt, isdir);
	if (error)
	return (error);

	if (dfaclcnt) {
	error = ln_aent_to_ace(&aclentp[dfaclstart], dfaclcnt,
	&dfacep, &dfacecnt, isdir);
	if (error) {
	if (acep) {
	cacl_free(acep, acecnt * sizeof (ace_t));
	}
	return (error);
	}
	}

	if (dfacecnt != 0) {
	acesz = sizeof (ace_t) * acecnt;
	dfacesz = sizeof (ace_t) * dfacecnt;
	acep = cacl_realloc(acep, acesz, acesz + dfacesz);
	if (acep == NULL)
	return (ENOMEM);
	if (dfaclcnt) {
	(void) memcpy(acep + acecnt, dfacep, dfacesz);
	}
	}
	if (dfaclcnt)
	cacl_free(dfacep, dfacecnt * sizeof (ace_t));

	*retacecnt = acecnt + dfacecnt;
	*retacep = acep;
	return (0);
	}

	static int
	ace_mask_to_mode(uint32_t mask, o_mode_t *modep, boolean_t isdir)
	{
	int error = 0;
	o_mode_t mode = 0;
	uint32_t bits, wantbits;

	/* read */
	if (mask & ACE_READ_DATA)
	mode \|= S_IROTH;

	/* write */
	wantbits = (ACE_WRITE_DATA \| ACE_APPEND_DATA);
	if (isdir)
	wantbits \|= ACE_DELETE_CHILD;
	bits = mask & wantbits;
	if (bits != 0) {
	if (bits != wantbits) {
	error = ENOTSUP;
	goto out;
	}
	mode \|= S_IWOTH;
	}

	/* exec */
	if (mask & ACE_EXECUTE) {
	mode \|= S_IXOTH;
	}

	*modep = mode;

	out:
	return (error);
	}

	static void
	acevals_init(acevals_t *vals, uid_t key)
	{
	bzero(vals, sizeof (*vals));
	vals->allowed = ACE_MASK_UNDEFINED;
	vals->denied = ACE_MASK_UNDEFINED;
	vals->mask = ACE_MASK_UNDEFINED;
	vals->key = key;
	}

	static void
	ace_list_init(ace_list_t *al, int dfacl_flag)
	{
	acevals_init(&al->user_obj, 0);
	acevals_init(&al->group_obj, 0);
	acevals_init(&al->other_obj, 0);
	al->numusers = 0;
	al->numgroups = 0;
	al->acl_mask = 0;
	al->hasmask = 0;
	al->state = ace_unused;
	al->seen = 0;
	al->dfacl_flag = dfacl_flag;
	}

	/*
	* Find or create an acevals holder for a given id and avl tree.
	*
	* Note that only one thread will ever touch these avl trees, so
	* there is no need for locking.
	*/
	static acevals_t *
	acevals_find(ace_t ace, avl_tree_t avl, int *num)
	{
	acevals_t key, *rc;
	avl_index_t where;

	key.key = ace->a_who;
	rc = avl_find(avl, &key, &where);
	if (rc != NULL)
	return (rc);

	/* this memory is freed by ln_ace_to_aent()->ace_list_free() */
	if (cacl_malloc((void **)&rc, sizeof (acevals_t)) != 0)
	return (NULL);

	acevals_init(rc, ace->a_who);
	avl_insert(avl, rc, where);
	(*num)++;

	return (rc);
	}

	static int
	access_mask_check(ace_t *acep, int mask_bit, int isowner)
	{
	int set_deny, err_deny;
	int set_allow, err_allow;
	int acl_consume;
	int haswriteperm, hasreadperm;

	if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) {
	haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 0 : 1;
	hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 0 : 1;
	} else {
	haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 1 : 0;
	hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 1 : 0;
	}

	acl_consume = (ACL_SYNCHRONIZE_ERR_DENY \|
	ACL_DELETE_ERR_DENY \|
	ACL_WRITE_OWNER_ERR_DENY \|
	ACL_WRITE_OWNER_ERR_ALLOW \|
	ACL_WRITE_ATTRS_OWNER_SET_ALLOW \|
	ACL_WRITE_ATTRS_OWNER_ERR_DENY \|
	ACL_WRITE_ATTRS_WRITER_SET_DENY \|
	ACL_WRITE_ATTRS_WRITER_ERR_ALLOW \|
	ACL_WRITE_NAMED_WRITER_ERR_DENY \|
	ACL_READ_NAMED_READER_ERR_DENY);

	if (mask_bit == ACE_SYNCHRONIZE) {
	set_deny = ACL_SYNCHRONIZE_SET_DENY;
	err_deny = ACL_SYNCHRONIZE_ERR_DENY;
	set_allow = ACL_SYNCHRONIZE_SET_ALLOW;
	err_allow = ACL_SYNCHRONIZE_ERR_ALLOW;
	} else if (mask_bit == ACE_WRITE_OWNER) {
	set_deny = ACL_WRITE_OWNER_SET_DENY;
	err_deny = ACL_WRITE_OWNER_ERR_DENY;
	set_allow = ACL_WRITE_OWNER_SET_ALLOW;
	err_allow = ACL_WRITE_OWNER_ERR_ALLOW;
	} else if (mask_bit == ACE_DELETE) {
	set_deny = ACL_DELETE_SET_DENY;
	err_deny = ACL_DELETE_ERR_DENY;
	set_allow = ACL_DELETE_SET_ALLOW;
	err_allow = ACL_DELETE_ERR_ALLOW;
	} else if (mask_bit == ACE_WRITE_ATTRIBUTES) {
	if (isowner) {
	set_deny = ACL_WRITE_ATTRS_OWNER_SET_DENY;
	err_deny = ACL_WRITE_ATTRS_OWNER_ERR_DENY;
	set_allow = ACL_WRITE_ATTRS_OWNER_SET_ALLOW;
	err_allow = ACL_WRITE_ATTRS_OWNER_ERR_ALLOW;
	} else if (haswriteperm) {
	set_deny = ACL_WRITE_ATTRS_WRITER_SET_DENY;
	err_deny = ACL_WRITE_ATTRS_WRITER_ERR_DENY;
	set_allow = ACL_WRITE_ATTRS_WRITER_SET_ALLOW;
	err_allow = ACL_WRITE_ATTRS_WRITER_ERR_ALLOW;
	} else {
	if ((acep->a_access_mask & mask_bit) &&
	(acep->a_type & ACE_ACCESS_ALLOWED_ACE_TYPE)) {
	return (ENOTSUP);
	}
	return (0);
	}
	} else if (mask_bit == ACE_READ_NAMED_ATTRS) {
	if (!hasreadperm)
	return (0);

	set_deny = ACL_READ_NAMED_READER_SET_DENY;
	err_deny = ACL_READ_NAMED_READER_ERR_DENY;
	set_allow = ACL_READ_NAMED_READER_SET_ALLOW;
	err_allow = ACL_READ_NAMED_READER_ERR_ALLOW;
	} else if (mask_bit == ACE_WRITE_NAMED_ATTRS) {
	if (!haswriteperm)
	return (0);

	set_deny = ACL_WRITE_NAMED_WRITER_SET_DENY;
	err_deny = ACL_WRITE_NAMED_WRITER_ERR_DENY;
	set_allow = ACL_WRITE_NAMED_WRITER_SET_ALLOW;
	err_allow = ACL_WRITE_NAMED_WRITER_ERR_ALLOW;
	} else {
	return (EINVAL);
	}

	if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) {
	if (acl_consume & set_deny) {
	if (!(acep->a_access_mask & mask_bit)) {
	return (ENOTSUP);
	}
	} else if (acl_consume & err_deny) {
	if (acep->a_access_mask & mask_bit) {
	return (ENOTSUP);
	}
	}
	} else {
	/* ACE_ACCESS_ALLOWED_ACE_TYPE */
	if (acl_consume & set_allow) {
	if (!(acep->a_access_mask & mask_bit)) {
	return (ENOTSUP);
	}
	} else if (acl_consume & err_allow) {
	if (acep->a_access_mask & mask_bit) {
	return (ENOTSUP);
	}
	}
	}
	return (0);
	}

	static int
	ace_to_aent_legal(ace_t *acep)
	{
	int error = 0;
	int isowner;

	/* only ALLOW or DENY */
	if ((acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE) &&
	(acep->a_type != ACE_ACCESS_DENIED_ACE_TYPE)) {
	error = ENOTSUP;
	goto out;
	}

	/* check for invalid flags */
	if (acep->a_flags & ~(ACE_VALID_FLAG_BITS)) {
	error = EINVAL;
	goto out;
	}

	/* some flags are illegal */
	if (acep->a_flags & (ACE_SUCCESSFUL_ACCESS_ACE_FLAG \|
	ACE_FAILED_ACCESS_ACE_FLAG \|
	ACE_NO_PROPAGATE_INHERIT_ACE)) {
	error = ENOTSUP;
	goto out;
	}

	/* check for invalid masks */
	if (acep->a_access_mask & ~(ACE_VALID_MASK_BITS)) {
	error = EINVAL;
	goto out;
	}

	if ((acep->a_flags & ACE_OWNER)) {
	isowner = 1;
	} else {
	isowner = 0;
	}

	error = access_mask_check(acep, ACE_SYNCHRONIZE, isowner);
	if (error)
	goto out;

	error = access_mask_check(acep, ACE_WRITE_OWNER, isowner);
	if (error)
	goto out;

	error = access_mask_check(acep, ACE_DELETE, isowner);
	if (error)
	goto out;

	error = access_mask_check(acep, ACE_WRITE_ATTRIBUTES, isowner);
	if (error)
	goto out;

	error = access_mask_check(acep, ACE_READ_NAMED_ATTRS, isowner);
	if (error)
	goto out;

	error = access_mask_check(acep, ACE_WRITE_NAMED_ATTRS, isowner);
	if (error)
	goto out;

	/* more detailed checking of masks */
	if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) {
	if (! (acep->a_access_mask & ACE_READ_ATTRIBUTES)) {
	error = ENOTSUP;
	goto out;
	}
	if ((acep->a_access_mask & ACE_WRITE_DATA) &&
	(! (acep->a_access_mask & ACE_APPEND_DATA))) {
	error = ENOTSUP;
	goto out;
	}
	if ((! (acep->a_access_mask & ACE_WRITE_DATA)) &&
	(acep->a_access_mask & ACE_APPEND_DATA)) {
	error = ENOTSUP;
	goto out;
	}
	}

	/* ACL enforcement */
	if ((acep->a_access_mask & ACE_READ_ACL) &&
	(acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE)) {
	error = ENOTSUP;
	goto out;
	}
	if (acep->a_access_mask & ACE_WRITE_ACL) {
	if ((acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) &&
	(isowner)) {
	error = ENOTSUP;
	goto out;
	}
	if ((acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) &&
	(! isowner)) {
	error = ENOTSUP;
	goto out;
	}
	}

	out:
	return (error);
	}

	static int
	ace_allow_to_mode(uint32_t mask, o_mode_t *modep, boolean_t isdir)
	{
	/* ACE_READ_ACL and ACE_READ_ATTRIBUTES must both be set */
	if ((mask & (ACE_READ_ACL \| ACE_READ_ATTRIBUTES)) !=
	(ACE_READ_ACL \| ACE_READ_ATTRIBUTES)) {
	return (ENOTSUP);
	}

	return (ace_mask_to_mode(mask, modep, isdir));
	}

	static int
	acevals_to_aent(acevals_t vals, aclent_t dest, ace_list_t *list,
	uid_t owner, gid_t group, boolean_t isdir)
	{
	int error;
	uint32_t flips = ACE_POSIX_SUPPORTED_BITS;

	if (isdir)
	flips \|= ACE_DELETE_CHILD;
	if (vals->allowed != (vals->denied ^ flips)) {
	error = ENOTSUP;
	goto out;
	}
	if ((list->hasmask) && (list->acl_mask != vals->mask) &&
	(vals->aent_type & (USER \| GROUP \| GROUP_OBJ))) {
	error = ENOTSUP;
	goto out;
	}
	error = ace_allow_to_mode(vals->allowed, &dest->a_perm, isdir);
	if (error != 0)
	goto out;
	dest->a_type = vals->aent_type;
	if (dest->a_type & (USER \| GROUP)) {
	dest->a_id = vals->key;
	} else if (dest->a_type & USER_OBJ) {
	dest->a_id = owner;
	} else if (dest->a_type & GROUP_OBJ) {
	dest->a_id = group;
	} else if (dest->a_type & OTHER_OBJ) {
	dest->a_id = 0;
	} else {
	error = EINVAL;
	goto out;
	}

	out:
	return (error);
	}


	static int
	ace_list_to_aent(ace_list_t list, aclent_t aclentp, int aclcnt,
	uid_t owner, gid_t group, boolean_t isdir)
	{
	int error = 0;
	aclent_t aent, result = NULL;
	acevals_t *vals;
	int resultcount;

	if ((list->seen & (USER_OBJ \| GROUP_OBJ \| OTHER_OBJ)) !=
	(USER_OBJ \| GROUP_OBJ \| OTHER_OBJ)) {
	error = ENOTSUP;
	goto out;
	}
	if ((! list->hasmask) && (list->numusers + list->numgroups > 0)) {
	error = ENOTSUP;
	goto out;
	}

	resultcount = 3 + list->numusers + list->numgroups;
	/*
	* This must be the same condition as below, when we add the CLASS_OBJ
	* (aka ACL mask)
	*/
	if ((list->hasmask) \|\| (! list->dfacl_flag))
	resultcount += 1;

	if (cacl_malloc((void **)&result,
	resultcount * sizeof (aclent_t)) != 0) {
	error = ENOMEM;
	goto out;
	}
	aent = result;

	/* USER_OBJ */
	if (!(list->user_obj.aent_type & USER_OBJ)) {
	error = EINVAL;
	goto out;
	}

	error = acevals_to_aent(&list->user_obj, aent, list, owner, group,
	isdir);

	if (error != 0)
	goto out;
	++aent;
	/* USER */
	vals = NULL;
	for (vals = avl_first(&list->user); vals != NULL;
	vals = AVL_NEXT(&list->user, vals)) {
	if (!(vals->aent_type & USER)) {
	error = EINVAL;
	goto out;
	}
	error = acevals_to_aent(vals, aent, list, owner, group,
	isdir);
	if (error != 0)
	goto out;
	++aent;
	}
	/* GROUP_OBJ */
	if (!(list->group_obj.aent_type & GROUP_OBJ)) {
	error = EINVAL;
	goto out;
	}
	error = acevals_to_aent(&list->group_obj, aent, list, owner, group,
	isdir);
	if (error != 0)
	goto out;
	++aent;
	/* GROUP */
	vals = NULL;
	for (vals = avl_first(&list->group); vals != NULL;
	vals = AVL_NEXT(&list->group, vals)) {
	if (!(vals->aent_type & GROUP)) {
	error = EINVAL;
	goto out;
	}
	error = acevals_to_aent(vals, aent, list, owner, group,
	isdir);
	if (error != 0)
	goto out;
	++aent;
	}
	/*
	* CLASS_OBJ (aka ACL_MASK)
	*
	* An ACL_MASK is not fabricated if the ACL is a default ACL.
	* This is to follow UFS's behavior.
	*/
	if ((list->hasmask) \|\| (! list->dfacl_flag)) {
	if (list->hasmask) {
	uint32_t flips = ACE_POSIX_SUPPORTED_BITS;
	if (isdir)
	flips \|= ACE_DELETE_CHILD;
	error = ace_mask_to_mode(list->acl_mask ^ flips,
	&aent->a_perm, isdir);
	if (error != 0)
	goto out;
	} else {
	/* fabricate the ACL_MASK from the group permissions */
	error = ace_mask_to_mode(list->group_obj.allowed,
	&aent->a_perm, isdir);
	if (error != 0)
	goto out;
	}
	aent->a_id = 0;
	aent->a_type = CLASS_OBJ \| list->dfacl_flag;
	++aent;
	}
	/* OTHER_OBJ */
	if (!(list->other_obj.aent_type & OTHER_OBJ)) {
	error = EINVAL;
	goto out;
	}
	error = acevals_to_aent(&list->other_obj, aent, list, owner, group,
	isdir);
	if (error != 0)
	goto out;
	++aent;

	*aclentp = result;
	*aclcnt = resultcount;

	out:
	if (error != 0) {
	if (result != NULL)
	cacl_free(result, resultcount * sizeof (aclent_t));
	}

	return (error);
	}


	/*
	* free all data associated with an ace_list
	*/
	static void
	ace_list_free(ace_list_t *al)
	{
	acevals_t *node;
	void *cookie;

	if (al == NULL)
	return;

	cookie = NULL;
	while ((node = avl_destroy_nodes(&al->user, &cookie)) != NULL)
	cacl_free(node, sizeof (acevals_t));
	cookie = NULL;
	while ((node = avl_destroy_nodes(&al->group, &cookie)) != NULL)
	cacl_free(node, sizeof (acevals_t));

	avl_destroy(&al->user);
	avl_destroy(&al->group);

	/* free the container itself */
	cacl_free(al, sizeof (ace_list_t));
	}

	static int
	acevals_compare(const void va, const void vb)
	{
	const acevals_t a = va, b = vb;

	if (a->key == b->key)
	return (0);

	if (a->key > b->key)
	return (1);

	else
	return (-1);
	}

	/*
	* Convert a list of ace_t entries to equivalent regular and default
	* aclent_t lists. Return error (ENOTSUP) when conversion is not possible.
	*/
	static int
	ln_ace_to_aent(ace_t *ace, int n, uid_t owner, gid_t group,
	aclent_t *aclentp, int aclcnt, aclent_t *dfaclentp, int dfaclcnt,
	boolean_t isdir)
	{
	int error = 0;
	ace_t *acep;
	uint32_t bits;
	int i;
	ace_list_t normacl = NULL, dfacl = NULL, *acl;
	acevals_t *vals;

	*aclentp = NULL;
	*aclcnt = 0;
	*dfaclentp = NULL;
	*dfaclcnt = 0;

	/* we need at least user_obj, group_obj, and other_obj */
	if (n < 6) {
	error = ENOTSUP;
	goto out;
	}
	if (ace == NULL) {
	error = EINVAL;
	goto out;
	}

	error = cacl_malloc((void **)&normacl, sizeof (ace_list_t));
	if (error != 0)
	goto out;

	avl_create(&normacl->user, acevals_compare, sizeof (acevals_t),
	offsetof(acevals_t, avl));
	avl_create(&normacl->group, acevals_compare, sizeof (acevals_t),
	offsetof(acevals_t, avl));

	ace_list_init(normacl, 0);

	error = cacl_malloc((void **)&dfacl, sizeof (ace_list_t));
	if (error != 0)
	goto out;

	avl_create(&dfacl->user, acevals_compare, sizeof (acevals_t),
	offsetof(acevals_t, avl));
	avl_create(&dfacl->group, acevals_compare, sizeof (acevals_t),
	offsetof(acevals_t, avl));
	ace_list_init(dfacl, ACL_DEFAULT);

	/* process every ace_t... */
	for (i = 0; i < n; i++) {
	acep = &ace[i];

	/* rule out certain cases quickly */
	error = ace_to_aent_legal(acep);
	if (error != 0)
	goto out;

	/*
	* Turn off these bits in order to not have to worry about
	* them when doing the checks for compliments.
	*/
	acep->a_access_mask &= ~(ACE_WRITE_OWNER \| ACE_DELETE \|
	ACE_SYNCHRONIZE \| ACE_WRITE_ATTRIBUTES \|
	ACE_READ_NAMED_ATTRS \| ACE_WRITE_NAMED_ATTRS);

	/* see if this should be a regular or default acl */
	bits = acep->a_flags &
	(ACE_INHERIT_ONLY_ACE \|
	ACE_FILE_INHERIT_ACE \|
	ACE_DIRECTORY_INHERIT_ACE);
	if (bits != 0) {
	/* all or nothing on these inherit bits */
	if (bits != (ACE_INHERIT_ONLY_ACE \|
	ACE_FILE_INHERIT_ACE \|
	ACE_DIRECTORY_INHERIT_ACE)) {
	error = ENOTSUP;
	goto out;
	}
	acl = dfacl;
	} else {
	acl = normacl;
	}

	if ((acep->a_flags & ACE_OWNER)) {
	if (acl->state > ace_user_obj) {
	error = ENOTSUP;
	goto out;
	}
	acl->state = ace_user_obj;
	acl->seen \|= USER_OBJ;
	vals = &acl->user_obj;
	vals->aent_type = USER_OBJ \| acl->dfacl_flag;
	} else if ((acep->a_flags & ACE_EVERYONE)) {
	acl->state = ace_other_obj;
	acl->seen \|= OTHER_OBJ;
	vals = &acl->other_obj;
	vals->aent_type = OTHER_OBJ \| acl->dfacl_flag;
	} else if (acep->a_flags & ACE_IDENTIFIER_GROUP) {
	if (acl->state > ace_group) {
	error = ENOTSUP;
	goto out;
	}
	if ((acep->a_flags & ACE_GROUP)) {
	acl->seen \|= GROUP_OBJ;
	vals = &acl->group_obj;
	vals->aent_type = GROUP_OBJ \| acl->dfacl_flag;
	} else {
	acl->seen \|= GROUP;
	vals = acevals_find(acep, &acl->group,
	&acl->numgroups);
	if (vals == NULL) {
	error = ENOMEM;
	goto out;
	}
	vals->aent_type = GROUP \| acl->dfacl_flag;
	}
	acl->state = ace_group;
	} else {
	if (acl->state > ace_user) {
	error = ENOTSUP;
	goto out;
	}
	acl->state = ace_user;
	acl->seen \|= USER;
	vals = acevals_find(acep, &acl->user,
	&acl->numusers);
	if (vals == NULL) {
	error = ENOMEM;
	goto out;
	}
	vals->aent_type = USER \| acl->dfacl_flag;
	}

	if (!(acl->state > ace_unused)) {
	error = EINVAL;
	goto out;
	}

	if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) {
	/* no more than one allowed per aclent_t */
	if (vals->allowed != ACE_MASK_UNDEFINED) {
	error = ENOTSUP;
	goto out;
	}
	vals->allowed = acep->a_access_mask;
	} else {
	/*
	* it's a DENY; if there was a previous DENY, it
	* must have been an ACL_MASK.
	*/
	if (vals->denied != ACE_MASK_UNDEFINED) {
	/* ACL_MASK is for USER and GROUP only */
	if ((acl->state != ace_user) &&
	(acl->state != ace_group)) {
	error = ENOTSUP;
	goto out;
	}

	if (! acl->hasmask) {
	acl->hasmask = 1;
	acl->acl_mask = vals->denied;
	/* check for mismatched ACL_MASK emulations */
	} else if (acl->acl_mask != vals->denied) {
	error = ENOTSUP;
	goto out;
	}
	vals->mask = vals->denied;
	}
	vals->denied = acep->a_access_mask;
	}
	}

	/* done collating; produce the aclent_t lists */
	if (normacl->state != ace_unused) {
	error = ace_list_to_aent(normacl, aclentp, aclcnt,
	owner, group, isdir);
	if (error != 0) {
	goto out;
	}
	}
	if (dfacl->state != ace_unused) {
	error = ace_list_to_aent(dfacl, dfaclentp, dfaclcnt,
	owner, group, isdir);
	if (error != 0) {
	goto out;
	}
	}

	out:
	if (normacl != NULL)
	ace_list_free(normacl);
	if (dfacl != NULL)
	ace_list_free(dfacl);

	return (error);
	}

	static int
	convert_ace_to_aent(ace_t *acebufp, int acecnt, boolean_t isdir,
	uid_t owner, gid_t group, aclent_t *retaclentp, int retaclcnt)
	{
	int error = 0;
	aclent_t aclentp, dfaclentp;
	int aclcnt, dfaclcnt;
	int aclsz, dfaclsz;

	error = ln_ace_to_aent(acebufp, acecnt, owner, group,
	&aclentp, &aclcnt, &dfaclentp, &dfaclcnt, isdir);

	if (error)
	return (error);


	if (dfaclcnt != 0) {
	/*
	* Slap aclentp and dfaclentp into a single array.
	*/
	aclsz = sizeof (aclent_t) * aclcnt;
	dfaclsz = sizeof (aclent_t) * dfaclcnt;
	aclentp = cacl_realloc(aclentp, aclsz, aclsz + dfaclsz);
	if (aclentp != NULL) {
	(void) memcpy(aclentp + aclcnt, dfaclentp, dfaclsz);
	} else {
	error = ENOMEM;
	}
	}

	if (aclentp) {
	*retaclentp = aclentp;
	*retaclcnt = aclcnt + dfaclcnt;
	}

	if (dfaclentp)
	cacl_free(dfaclentp, dfaclsz);

	return (error);
	}


	int
	acl_translate(acl_t *aclp, int target_flavor, boolean_t isdir, uid_t owner,
	gid_t group)
	{
	int aclcnt;
	void *acldata;
	int error;

	/*
	* See if we need to translate
	*/
	if ((target_flavor == _ACL_ACE_ENABLED && aclp->acl_type == ACE_T) \|\|
	(target_flavor == _ACL_ACLENT_ENABLED &&
	aclp->acl_type == ACLENT_T))
	return (0);

	if (target_flavor == -1) {
	error = EINVAL;
	goto out;
	}

	if (target_flavor == _ACL_ACE_ENABLED &&
	aclp->acl_type == ACLENT_T) {
	error = convert_aent_to_ace(aclp->acl_aclp,
	aclp->acl_cnt, isdir, (ace_t **)&acldata, &aclcnt);
	if (error)
	goto out;

	} else if (target_flavor == _ACL_ACLENT_ENABLED &&
	aclp->acl_type == ACE_T) {
	error = convert_ace_to_aent(aclp->acl_aclp, aclp->acl_cnt,
	isdir, owner, group, (aclent_t **)&acldata, &aclcnt);
	if (error)
	goto out;
	} else {
	error = ENOTSUP;
	goto out;
	}

	/*
	* replace old acl with newly translated acl
	*/
	cacl_free(aclp->acl_aclp, aclp->acl_cnt * aclp->acl_entry_size);
	aclp->acl_aclp = acldata;
	aclp->acl_cnt = aclcnt;
	if (target_flavor == _ACL_ACE_ENABLED) {
	aclp->acl_type = ACE_T;
	aclp->acl_entry_size = sizeof (ace_t);
	} else {
	aclp->acl_type = ACLENT_T;
	aclp->acl_entry_size = sizeof (aclent_t);
	}
	return (0);

	out:

	#if !defined(_KERNEL)
	errno = error;
	return (-1);
	#else
	return (error);
	#endif
	}
	#endif /* !_KERNEL */

	#define SET_ACE(acl, index, who, mask, type, flags) { \
	acl[0][index].a_who = (uint32_t)who; \
	acl[0][index].a_type = type; \
	acl[0][index].a_flags = flags; \
	acl[0][index++].a_access_mask = mask; \
	}

	void
	acl_trivial_access_masks(mode_t mode, boolean_t isdir, trivial_acl_t *masks)
	{
	uint32_t read_mask = ACE_READ_DATA;
	uint32_t write_mask = ACE_WRITE_DATA\|ACE_APPEND_DATA;
	uint32_t execute_mask = ACE_EXECUTE;

	(void) isdir; /* will need this later */

	masks->deny1 = 0;
	if (!(mode & S_IRUSR) && (mode & (S_IRGRP\|S_IROTH)))
	masks->deny1 \|= read_mask;
	if (!(mode & S_IWUSR) && (mode & (S_IWGRP\|S_IWOTH)))
	masks->deny1 \|= write_mask;
	if (!(mode & S_IXUSR) && (mode & (S_IXGRP\|S_IXOTH)))
	masks->deny1 \|= execute_mask;

	masks->deny2 = 0;
	if (!(mode & S_IRGRP) && (mode & S_IROTH))
	masks->deny2 \|= read_mask;
	if (!(mode & S_IWGRP) && (mode & S_IWOTH))
	masks->deny2 \|= write_mask;
	if (!(mode & S_IXGRP) && (mode & S_IXOTH))
	masks->deny2 \|= execute_mask;

	masks->allow0 = 0;
	if ((mode & S_IRUSR) && (!(mode & S_IRGRP) && (mode & S_IROTH)))
	masks->allow0 \|= read_mask;
	if ((mode & S_IWUSR) && (!(mode & S_IWGRP) && (mode & S_IWOTH)))
	masks->allow0 \|= write_mask;
	if ((mode & S_IXUSR) && (!(mode & S_IXGRP) && (mode & S_IXOTH)))
	masks->allow0 \|= execute_mask;

	masks->owner = ACE_WRITE_ATTRIBUTES\|ACE_WRITE_OWNER\|ACE_WRITE_ACL\|
	ACE_WRITE_NAMED_ATTRS\|ACE_READ_ACL\|ACE_READ_ATTRIBUTES\|
	ACE_READ_NAMED_ATTRS\|ACE_SYNCHRONIZE;
	if (mode & S_IRUSR)
	masks->owner \|= read_mask;
	if (mode & S_IWUSR)
	masks->owner \|= write_mask;
	if (mode & S_IXUSR)
	masks->owner \|= execute_mask;

	masks->group = ACE_READ_ACL\|ACE_READ_ATTRIBUTES\|ACE_READ_NAMED_ATTRS\|
	ACE_SYNCHRONIZE;
	if (mode & S_IRGRP)
	masks->group \|= read_mask;
	if (mode & S_IWGRP)
	masks->group \|= write_mask;
	if (mode & S_IXGRP)
	masks->group \|= execute_mask;

	masks->everyone = ACE_READ_ACL\|ACE_READ_ATTRIBUTES\|ACE_READ_NAMED_ATTRS\|
	ACE_SYNCHRONIZE;
	if (mode & S_IROTH)
	masks->everyone \|= read_mask;
	if (mode & S_IWOTH)
	masks->everyone \|= write_mask;
	if (mode & S_IXOTH)
	masks->everyone \|= execute_mask;
	}

	int
	acl_trivial_create(mode_t mode, boolean_t isdir, ace_t *acl, int count)
	{
	int index = 0;
	int error;
	trivial_acl_t masks;

	*count = 3;
	acl_trivial_access_masks(mode, isdir, &masks);

	if (masks.allow0)
	(*count)++;
	if (masks.deny1)
	(*count)++;
	if (masks.deny2)
	(*count)++;

	if ((error = cacl_malloc((void *)acl, count * sizeof (ace_t))) != 0)
	return (error);

	if (masks.allow0) {
	SET_ACE(acl, index, -1, masks.allow0,
	ACE_ACCESS_ALLOWED_ACE_TYPE, ACE_OWNER);
	}
	if (masks.deny1) {
	SET_ACE(acl, index, -1, masks.deny1,
	ACE_ACCESS_DENIED_ACE_TYPE, ACE_OWNER);
	}
	if (masks.deny2) {
	SET_ACE(acl, index, -1, masks.deny2,
	ACE_ACCESS_DENIED_ACE_TYPE, ACE_GROUP\|ACE_IDENTIFIER_GROUP);
	}

	SET_ACE(acl, index, -1, masks.owner, ACE_ACCESS_ALLOWED_ACE_TYPE,
	ACE_OWNER);
	SET_ACE(acl, index, -1, masks.group, ACE_ACCESS_ALLOWED_ACE_TYPE,
	ACE_IDENTIFIER_GROUP\|ACE_GROUP);
	SET_ACE(acl, index, -1, masks.everyone, ACE_ACCESS_ALLOWED_ACE_TYPE,
	ACE_EVERYONE);

	return (0);
	}

	/*
	* ace_trivial:
	* determine whether an ace_t acl is trivial
	*
	* Trivialness implies that the acl is composed of only
	* owner, group, everyone entries. ACL can't
	* have read_acl denied, and write_owner/write_acl/write_attributes
	* can only be owner@ entry.
	*/
	int
	ace_trivial_common(void *acep, int aclcnt,
	uint64_t (walk)(void , uint64_t, int aclcnt,
	uint16_t , uint16_t , uint32_t *))
	{
	uint16_t flags;
	uint32_t mask;
	uint16_t type;
	uint64_t cookie = 0;

	while ((cookie = walk(acep, cookie, aclcnt, &flags, &type, &mask))) {
	switch (flags & ACE_TYPE_FLAGS) {
	case ACE_OWNER:
	case ACE_GROUP\|ACE_IDENTIFIER_GROUP:
	case ACE_EVERYONE:
	break;
	default:
	return (1);

	}

	if (flags & (ACE_FILE_INHERIT_ACE\|
	ACE_DIRECTORY_INHERIT_ACE\|ACE_NO_PROPAGATE_INHERIT_ACE\|
	ACE_INHERIT_ONLY_ACE))
	return (1);

	/*
	* Special check for some special bits
	*
	* Don't allow anybody to deny reading basic
	* attributes or a files ACL.
	*/
	if ((mask & (ACE_READ_ACL\|ACE_READ_ATTRIBUTES)) &&
	(type == ACE_ACCESS_DENIED_ACE_TYPE))
	return (1);

	/*
	* Delete permissions are never set by default
	*/
	if (mask & (ACE_DELETE\|ACE_DELETE_CHILD))
	return (1);
	/*
	* only allow owner@ to have
	* write_acl/write_owner/write_attributes/write_xattr/
	*/
	if (type == ACE_ACCESS_ALLOWED_ACE_TYPE &&
	(!(flags & ACE_OWNER) && (mask &
	(ACE_WRITE_OWNER\|ACE_WRITE_ACL\| ACE_WRITE_ATTRIBUTES\|
	ACE_WRITE_NAMED_ATTRS))))
	return (1);

	}
	return (0);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/callb.c b/sys/contrib/openzfs/module/os/freebsd/spl/callb.c
	index fffa85b6b91b..0b7fefc89a26 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/callb.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/callb.c
	@@ -1,373 +1,373 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/sysmacros.h>
	#include <sys/systm.h>
	#include <sys/proc.h>
	#include <sys/mutex.h>
	#include <sys/condvar.h>
	#include <sys/callb.h>
	#include <sys/kmem.h>
	#include <sys/cmn_err.h>
	#include <sys/debug.h>
	#include <sys/kobj.h>
	#include <sys/systm.h> /* for delay() */
	#include <sys/taskq.h> /* For TASKQ_NAMELEN */
	#include <sys/kernel.h>

	#define CB_MAXNAME TASKQ_NAMELEN

	/*
	* The callb mechanism provides generic event scheduling/echoing.
	* A callb function is registered and called on behalf of the event.
	*/
	typedef struct callb {
	struct callb c_next; / next in class or on freelist */
	kthread_id_t c_thread; /* ptr to caller's thread struct */
	char c_flag; /* info about the callb state */
	uchar_t c_class; /* this callb's class */
	kcondvar_t c_done_cv; /* signal callb completion */
	boolean_t (c_func)(void , int);
	/* cb function: returns true if ok */
	void c_arg; / arg to c_func */
	char c_name[CB_MAXNAME+1]; /* debug:max func name length */
	} callb_t;

	/*
	* callb c_flag bitmap definitions
	*/
	#define CALLB_FREE 0x0
	#define CALLB_TAKEN 0x1
	#define CALLB_EXECUTING 0x2

	/*
	* Basic structure for a callb table.
	* All callbs are organized into different class groups described
	* by ct_class array.
	* The callbs within a class are single-linked and normally run by a
	* serial execution.
	*/
	typedef struct callb_table {
	kmutex_t ct_lock; /* protect all callb states */
	callb_t ct_freelist; / free callb structures */
	- int ct_busy; /* != 0 prevents additions */
	+ boolean_t ct_busy; /* B_TRUE prevents additions */
	kcondvar_t ct_busy_cv; /* to wait for not busy */
	int ct_ncallb; /* num of callbs allocated */
	callb_t ct_first_cb[NCBCLASS]; / ptr to 1st callb in a class */
	} callb_table_t;

	int callb_timeout_sec = CPR_KTHREAD_TIMEOUT_SEC;

	static callb_id_t callb_add_common(boolean_t ()(void , int),
	void , int, char , kthread_id_t);

	static callb_table_t callb_table; /* system level callback table */
	static callb_table_t *ct = &callb_table;
	static kmutex_t callb_safe_mutex;
	callb_cpr_t callb_cprinfo_safe = {
	&callb_safe_mutex, CALLB_CPR_ALWAYS_SAFE, 0, {0, 0} };

	/*
	* Init all callb tables in the system.
	*/
	static void
	callb_init(void *dummy __unused)
	{
	- callb_table.ct_busy = 0; /* mark table open for additions */
	+ callb_table.ct_busy = B_FALSE; /* mark table open for additions */
	mutex_init(&callb_safe_mutex, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&callb_table.ct_lock, NULL, MUTEX_DEFAULT, NULL);
	}

	static void
	callb_fini(void *dummy __unused)
	{
	callb_t *cp;
	int i;

	mutex_enter(&ct->ct_lock);
	for (i = 0; i < 16; i++) {
	while ((cp = ct->ct_freelist) != NULL) {
	ct->ct_freelist = cp->c_next;
	ct->ct_ncallb--;
	kmem_free(cp, sizeof (callb_t));
	}
	if (ct->ct_ncallb == 0)
	break;
	/* Not all callbacks finished, waiting for the rest. */
	mutex_exit(&ct->ct_lock);
	tsleep(ct, 0, "callb", hz / 4);
	mutex_enter(&ct->ct_lock);
	}
	if (ct->ct_ncallb > 0)
	printf("%s: Leaked %d callbacks!\n", __func__, ct->ct_ncallb);
	mutex_exit(&ct->ct_lock);
	mutex_destroy(&callb_safe_mutex);
	mutex_destroy(&callb_table.ct_lock);
	}

	/*
	* callout_add() is called to register func() be called later.
	*/
	static callb_id_t
	callb_add_common(boolean_t (func)(void arg, int code),
	void arg, int class, char name, kthread_id_t t)
	{
	callb_t *cp;

	- ASSERT(class < NCBCLASS);
	+ ASSERT3S(class, <, NCBCLASS);

	mutex_enter(&ct->ct_lock);
	while (ct->ct_busy)
	cv_wait(&ct->ct_busy_cv, &ct->ct_lock);
	if ((cp = ct->ct_freelist) == NULL) {
	ct->ct_ncallb++;
	cp = (callb_t *)kmem_zalloc(sizeof (callb_t), KM_SLEEP);
	}
	ct->ct_freelist = cp->c_next;
	cp->c_thread = t;
	cp->c_func = func;
	cp->c_arg = arg;
	cp->c_class = (uchar_t)class;
	cp->c_flag \|= CALLB_TAKEN;
	#ifdef ZFS_DEBUG
	if (strlen(name) > CB_MAXNAME)
	cmn_err(CE_WARN, "callb_add: name of callback function '%s' "
	"too long -- truncated to %d chars",
	name, CB_MAXNAME);
	#endif
	(void) strncpy(cp->c_name, name, CB_MAXNAME);
	cp->c_name[CB_MAXNAME] = '\0';

	/*
	* Insert the new callb at the head of its class list.
	*/
	cp->c_next = ct->ct_first_cb[class];
	ct->ct_first_cb[class] = cp;

	mutex_exit(&ct->ct_lock);
	return ((callb_id_t)cp);
	}

	/*
	* The default function to add an entry to the callback table. Since
	* it uses curthread as the thread identifier to store in the table,
	* it should be used for the normal case of a thread which is calling
	* to add ITSELF to the table.
	*/
	callb_id_t
	callb_add(boolean_t (func)(void arg, int code),
	void arg, int class, char name)
	{
	return (callb_add_common(func, arg, class, name, curthread));
	}

	/*
	* A special version of callb_add() above for use by threads which
	* might be adding an entry to the table on behalf of some other
	* thread (for example, one which is constructed but not yet running).
	* In this version the thread id is an argument.
	*/
	callb_id_t
	callb_add_thread(boolean_t (func)(void arg, int code),
	void arg, int class, char name, kthread_id_t t)
	{
	return (callb_add_common(func, arg, class, name, t));
	}

	/*
	* callout_delete() is called to remove an entry identified by id
	* that was originally placed there by a call to callout_add().
	* return -1 if fail to delete a callb entry otherwise return 0.
	*/
	int
	callb_delete(callb_id_t id)
	{
	callb_t **pp;
	callb_t me = (callb_t )id;

	mutex_enter(&ct->ct_lock);

	for (;;) {
	pp = &ct->ct_first_cb[me->c_class];
	while (pp != NULL && pp != me)
	pp = &(*pp)->c_next;

	#ifdef ZFS_DEBUG
	if (*pp != me) {
	cmn_err(CE_WARN, "callb delete bogus entry 0x%p",
	(void *)me);
	mutex_exit(&ct->ct_lock);
	return (-1);
	}
	#endif /* DEBUG */

	/*
	* It is not allowed to delete a callb in the middle of
	* executing otherwise, the callb_execute() will be confused.
	*/
	if (!(me->c_flag & CALLB_EXECUTING))
	break;

	cv_wait(&me->c_done_cv, &ct->ct_lock);
	}
	/* relink the class list */
	*pp = me->c_next;

	/* clean up myself and return the free callb to the head of freelist */
	me->c_flag = CALLB_FREE;
	me->c_next = ct->ct_freelist;
	ct->ct_freelist = me;

	mutex_exit(&ct->ct_lock);
	return (0);
	}

	/*
	* class: indicates to execute all callbs in the same class;
	* code: optional argument for the callb functions.
	* return: = 0: success
	* != 0: ptr to string supplied when callback was registered
	*/
	void *
	callb_execute_class(int class, int code)
	{
	callb_t *cp;
	void *ret = NULL;

	- ASSERT(class < NCBCLASS);
	+ ASSERT3S(class, <, NCBCLASS);

	mutex_enter(&ct->ct_lock);

	for (cp = ct->ct_first_cb[class];
	cp != NULL && ret == 0; cp = cp->c_next) {
	while (cp->c_flag & CALLB_EXECUTING)
	cv_wait(&cp->c_done_cv, &ct->ct_lock);
	/*
	* cont if the callb is deleted while we're sleeping
	*/
	if (cp->c_flag == CALLB_FREE)
	continue;
	cp->c_flag \|= CALLB_EXECUTING;

	#ifdef CALLB_DEBUG
	printf("callb_execute: name=%s func=%p arg=%p\n",
	cp->c_name, (void )cp->c_func, (void )cp->c_arg);
	#endif /* CALLB_DEBUG */

	mutex_exit(&ct->ct_lock);
	/* If callback function fails, pass back client's name */
	if (!(*cp->c_func)(cp->c_arg, code))
	ret = cp->c_name;
	mutex_enter(&ct->ct_lock);

	cp->c_flag &= ~CALLB_EXECUTING;
	cv_broadcast(&cp->c_done_cv);
	}
	mutex_exit(&ct->ct_lock);
	return (ret);
	}

	/*
	* callers make sure no recursive entries to this func.
	* dp->cc_lockp is registered by callb_add to protect callb_cpr_t structure.
	*
	* When calling to stop a kernel thread (code == CB_CODE_CPR_CHKPT) we
	* use a cv_timedwait() in case the kernel thread is blocked.
	*
	* Note that this is a generic callback handler for daemon CPR and
	* should NOT be changed to accommodate any specific requirement in a daemon.
	* Individual daemons that require changes to the handler shall write
	* callback routines in their own daemon modules.
	*/
	boolean_t
	callb_generic_cpr(void *arg, int code)
	{
	callb_cpr_t cp = (callb_cpr_t )arg;
	clock_t ret = 0; /* assume success */

	mutex_enter(cp->cc_lockp);

	switch (code) {
	case CB_CODE_CPR_CHKPT:
	cp->cc_events \|= CALLB_CPR_START;
	#ifdef CPR_NOT_THREAD_SAFE
	while (!(cp->cc_events & CALLB_CPR_SAFE))
	/* cv_timedwait() returns -1 if it times out. */
	if ((ret = cv_reltimedwait(&cp->cc_callb_cv,
	cp->cc_lockp, (callb_timeout_sec * hz),
	TR_CLOCK_TICK)) == -1)
	break;
	#endif
	break;

	case CB_CODE_CPR_RESUME:
	cp->cc_events &= ~CALLB_CPR_START;
	cv_signal(&cp->cc_stop_cv);
	break;
	}
	mutex_exit(cp->cc_lockp);
	return (ret != -1);
	}

	/*
	* The generic callback function associated with kernel threads which
	* are always considered safe.
	*/
	/* ARGSUSED */
	boolean_t
	callb_generic_cpr_safe(void *arg, int code)
	{
	return (B_TRUE);
	}
	/*
	* Prevent additions to callback table.
	*/
	void
	callb_lock_table(void)
	{
	mutex_enter(&ct->ct_lock);
	- ASSERT(ct->ct_busy == 0);
	- ct->ct_busy = 1;
	+ ASSERT(!ct->ct_busy);
	+ ct->ct_busy = B_TRUE;
	mutex_exit(&ct->ct_lock);
	}

	/*
	* Allow additions to callback table.
	*/
	void
	callb_unlock_table(void)
	{
	mutex_enter(&ct->ct_lock);
	- ASSERT(ct->ct_busy != 0);
	- ct->ct_busy = 0;
	+ ASSERT(ct->ct_busy);
	+ ct->ct_busy = B_FALSE;
	cv_broadcast(&ct->ct_busy_cv);
	mutex_exit(&ct->ct_lock);
	}

	SYSINIT(sol_callb, SI_SUB_DRIVERS, SI_ORDER_FIRST, callb_init, NULL);
	SYSUNINIT(sol_callb, SI_SUB_DRIVERS, SI_ORDER_FIRST, callb_fini, NULL);
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/list.c b/sys/contrib/openzfs/module/os/freebsd/spl/list.c
	index 0f5ae629126c..62374a417704 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/list.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/list.c
	@@ -1,244 +1,243 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	/*
	* Generic doubly-linked list implementation
	*/

	#include <sys/param.h>
	#include <sys/list.h>
	#include <sys/list_impl.h>
	#include <sys/types.h>
	#include <sys/debug.h>

	#define list_d2l(a, obj) ((list_node_t )(((char )obj) + (a)->list_offset))
	#define list_object(a, node) ((void )(((char )node) - (a)->list_offset))
	#define list_empty(a) ((a)->list_head.list_next == &(a)->list_head)

	#define list_insert_after_node(list, node, object) { \
	list_node_t *lnew = list_d2l(list, object); \
	lnew->list_prev = (node); \
	lnew->list_next = (node)->list_next; \
	(node)->list_next->list_prev = lnew; \
	(node)->list_next = lnew; \
	}

	#define list_insert_before_node(list, node, object) { \
	list_node_t *lnew = list_d2l(list, object); \
	lnew->list_next = (node); \
	lnew->list_prev = (node)->list_prev; \
	(node)->list_prev->list_next = lnew; \
	(node)->list_prev = lnew; \
	}

	#define list_remove_node(node) \
	(node)->list_prev->list_next = (node)->list_next; \
	(node)->list_next->list_prev = (node)->list_prev; \
	(node)->list_next = (node)->list_prev = NULL

	void
	list_create(list_t *list, size_t size, size_t offset)
	{
	- ASSERT(list);
	- ASSERT(size > 0);
	- ASSERT(size >= offset + sizeof (list_node_t));
	+ ASSERT3P(list, !=, NULL);
	+ ASSERT3U(size, >=, offset + sizeof (list_node_t));

	list->list_size = size;
	list->list_offset = offset;
	list->list_head.list_next = list->list_head.list_prev =
	&list->list_head;
	}

	void
	list_destroy(list_t *list)
	{
	list_node_t *node = &list->list_head;

	- ASSERT(list);
	- ASSERT(list->list_head.list_next == node);
	- ASSERT(list->list_head.list_prev == node);
	+ ASSERT3P(list, !=, NULL);
	+ ASSERT3P(list->list_head.list_next, ==, node);
	+ ASSERT3P(list->list_head.list_prev, ==, node);

	node->list_next = node->list_prev = NULL;
	}

	void
	list_insert_after(list_t list, void object, void *nobject)
	{
	if (object == NULL) {
	list_insert_head(list, nobject);
	} else {
	list_node_t *lold = list_d2l(list, object);
	list_insert_after_node(list, lold, nobject);
	}
	}

	void
	list_insert_before(list_t list, void object, void *nobject)
	{
	if (object == NULL) {
	list_insert_tail(list, nobject);
	} else {
	list_node_t *lold = list_d2l(list, object);
	list_insert_before_node(list, lold, nobject);
	}
	}

	void
	list_insert_head(list_t list, void object)
	{
	list_node_t *lold = &list->list_head;
	list_insert_after_node(list, lold, object);
	}

	void
	list_insert_tail(list_t list, void object)
	{
	list_node_t *lold = &list->list_head;
	list_insert_before_node(list, lold, object);
	}

	void
	list_remove(list_t list, void object)
	{
	list_node_t *lold = list_d2l(list, object);
	ASSERT(!list_empty(list));
	- ASSERT(lold->list_next != NULL);
	+ ASSERT3P(lold->list_next, !=, NULL);
	list_remove_node(lold);
	}

	void *
	list_remove_head(list_t *list)
	{
	list_node_t *head = list->list_head.list_next;
	if (head == &list->list_head)
	return (NULL);
	list_remove_node(head);
	return (list_object(list, head));
	}

	void *
	list_remove_tail(list_t *list)
	{
	list_node_t *tail = list->list_head.list_prev;
	if (tail == &list->list_head)
	return (NULL);
	list_remove_node(tail);
	return (list_object(list, tail));
	}

	void *
	list_head(list_t *list)
	{
	if (list_empty(list))
	return (NULL);
	return (list_object(list, list->list_head.list_next));
	}

	void *
	list_tail(list_t *list)
	{
	if (list_empty(list))
	return (NULL);
	return (list_object(list, list->list_head.list_prev));
	}

	void *
	list_next(list_t list, void object)
	{
	list_node_t *node = list_d2l(list, object);

	if (node->list_next != &list->list_head)
	return (list_object(list, node->list_next));

	return (NULL);
	}

	void *
	list_prev(list_t list, void object)
	{
	list_node_t *node = list_d2l(list, object);

	if (node->list_prev != &list->list_head)
	return (list_object(list, node->list_prev));

	return (NULL);
	}

	/*
	* Insert src list after dst list. Empty src list thereafter.
	*/
	void
	list_move_tail(list_t dst, list_t src)
	{
	list_node_t *dstnode = &dst->list_head;
	list_node_t *srcnode = &src->list_head;

	- ASSERT(dst->list_size == src->list_size);
	- ASSERT(dst->list_offset == src->list_offset);
	+ ASSERT3U(dst->list_size, ==, src->list_size);
	+ ASSERT3U(dst->list_offset, ==, src->list_offset);

	if (list_empty(src))
	return;

	dstnode->list_prev->list_next = srcnode->list_next;
	srcnode->list_next->list_prev = dstnode->list_prev;
	dstnode->list_prev = srcnode->list_prev;
	srcnode->list_prev->list_next = dstnode;

	/* empty src list */
	srcnode->list_next = srcnode->list_prev = srcnode;
	}

	void
	list_link_replace(list_node_t lold, list_node_t lnew)
	{
	ASSERT(list_link_active(lold));
	ASSERT(!list_link_active(lnew));

	lnew->list_next = lold->list_next;
	lnew->list_prev = lold->list_prev;
	lold->list_prev->list_next = lnew;
	lold->list_next->list_prev = lnew;
	lold->list_next = lold->list_prev = NULL;
	}

	void
	list_link_init(list_node_t *link)
	{
	link->list_next = NULL;
	link->list_prev = NULL;
	}

	int
	list_link_active(list_node_t *link)
	{
	EQUIV(link->list_next == NULL, link->list_prev == NULL);
	return (link->list_next != NULL);
	}

	int
	list_is_empty(list_t *list)
	{
	return (list_empty(list));
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/spl_kmem.c b/sys/contrib/openzfs/module/os/freebsd/spl/spl_kmem.c
	index cfc61dd7fc2a..ee8f1d851a48 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/spl_kmem.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/spl_kmem.c
	@@ -1,352 +1,352 @@
	/*
	* Copyright (c) 2006-2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/byteorder.h>
	#include <sys/kernel.h>
	#include <sys/systm.h>
	#include <sys/malloc.h>
	#include <sys/kmem.h>
	#include <sys/kmem_cache.h>
	#include <sys/debug.h>
	#include <sys/mutex.h>
	#include <sys/vmmeter.h>


	#include <vm/vm_page.h>
	#include <vm/vm_object.h>
	#include <vm/vm_kern.h>
	#include <vm/vm_map.h>

	#ifdef KMEM_DEBUG
	#include <sys/queue.h>
	#include <sys/stack.h>
	#endif

	#ifdef _KERNEL
	MALLOC_DEFINE(M_SOLARIS, "solaris", "Solaris");
	#else
	#define malloc(size, type, flags) malloc(size)
	#define free(addr, type) free(addr)
	#endif

	#ifdef KMEM_DEBUG
	struct kmem_item {
	struct stack stack;
	LIST_ENTRY(kmem_item) next;
	};
	static LIST_HEAD(, kmem_item) kmem_items;
	static struct mtx kmem_items_mtx;
	MTX_SYSINIT(kmem_items_mtx, &kmem_items_mtx, "kmem_items", MTX_DEF);
	#endif /* KMEM_DEBUG */

	#include <sys/vmem.h>

	void *
	zfs_kmem_alloc(size_t size, int kmflags)
	{
	void *p;
	#ifdef KMEM_DEBUG
	struct kmem_item *i;

	size += sizeof (struct kmem_item);
	#endif
	p = malloc(MAX(size, 16), M_SOLARIS, kmflags);
	#ifndef _KERNEL
	if (kmflags & KM_SLEEP)
	assert(p != NULL);
	#endif
	#ifdef KMEM_DEBUG
	if (p != NULL) {
	i = p;
	p = (uint8_t *)p + sizeof (struct kmem_item);
	stack_save(&i->stack);
	mtx_lock(&kmem_items_mtx);
	LIST_INSERT_HEAD(&kmem_items, i, next);
	mtx_unlock(&kmem_items_mtx);
	}
	#endif
	return (p);
	}

	void
	zfs_kmem_free(void *buf, size_t size __unused)
	{
	#ifdef KMEM_DEBUG
	if (buf == NULL) {
	printf("%s: attempt to free NULL\n", __func__);
	return;
	}
	struct kmem_item *i;

	buf = (uint8_t *)buf - sizeof (struct kmem_item);
	mtx_lock(&kmem_items_mtx);
	LIST_FOREACH(i, &kmem_items, next) {
	if (i == buf)
	break;
	}
	- ASSERT(i != NULL);
	+ ASSERT3P(i, !=, NULL);
	LIST_REMOVE(i, next);
	mtx_unlock(&kmem_items_mtx);
	memset(buf, 0xDC, MAX(size, 16));
	#endif
	free(buf, M_SOLARIS);
	}

	static uint64_t kmem_size_val;

	static void
	kmem_size_init(void *unused __unused)
	{

	kmem_size_val = (uint64_t)vm_cnt.v_page_count * PAGE_SIZE;
	if (kmem_size_val > vm_kmem_size)
	kmem_size_val = vm_kmem_size;
	}
	SYSINIT(kmem_size_init, SI_SUB_KMEM, SI_ORDER_ANY, kmem_size_init, NULL);

	uint64_t
	kmem_size(void)
	{

	return (kmem_size_val);
	}

	static int
	kmem_std_constructor(void mem, int size __unused, void private, int flags)
	{
	struct kmem_cache *cache = private;

	return (cache->kc_constructor(mem, cache->kc_private, flags));
	}

	static void
	kmem_std_destructor(void mem, int size __unused, void private)
	{
	struct kmem_cache *cache = private;

	cache->kc_destructor(mem, cache->kc_private);
	}

	kmem_cache_t *
	kmem_cache_create(char *name, size_t bufsize, size_t align,
	int (constructor)(void , void , int), void (destructor)(void , void ),
	void (reclaim)(void ) __unused, void private, vmem_t vmp, int cflags)
	{
	kmem_cache_t *cache;

	- ASSERT(vmp == NULL);
	+ ASSERT3P(vmp, ==, NULL);

	cache = kmem_alloc(sizeof (*cache), KM_SLEEP);
	strlcpy(cache->kc_name, name, sizeof (cache->kc_name));
	cache->kc_constructor = constructor;
	cache->kc_destructor = destructor;
	cache->kc_private = private;
	#if defined(_KERNEL) && !defined(KMEM_DEBUG)
	cache->kc_zone = uma_zcreate(cache->kc_name, bufsize,
	constructor != NULL ? kmem_std_constructor : NULL,
	destructor != NULL ? kmem_std_destructor : NULL,
	NULL, NULL, align > 0 ? align - 1 : 0, cflags);
	#else
	cache->kc_size = bufsize;
	#endif

	return (cache);
	}

	void
	kmem_cache_destroy(kmem_cache_t *cache)
	{
	#if defined(_KERNEL) && !defined(KMEM_DEBUG)
	uma_zdestroy(cache->kc_zone);
	#endif
	kmem_free(cache, sizeof (*cache));
	}

	void *
	kmem_cache_alloc(kmem_cache_t *cache, int flags)
	{
	#if defined(_KERNEL) && !defined(KMEM_DEBUG)
	return (uma_zalloc_arg(cache->kc_zone, cache, flags));
	#else
	void *p;

	p = kmem_alloc(cache->kc_size, flags);
	if (p != NULL && cache->kc_constructor != NULL)
	kmem_std_constructor(p, cache->kc_size, cache, flags);
	return (p);
	#endif
	}

	void
	kmem_cache_free(kmem_cache_t cache, void buf)
	{
	#if defined(_KERNEL) && !defined(KMEM_DEBUG)
	uma_zfree_arg(cache->kc_zone, buf, cache);
	#else
	if (cache->kc_destructor != NULL)
	kmem_std_destructor(buf, cache->kc_size, cache);
	kmem_free(buf, cache->kc_size);
	#endif
	}

	/*
	* Allow our caller to determine if there are running reaps.
	*
	* This call is very conservative and may return B_TRUE even when
	* reaping activity isn't active. If it returns B_FALSE, then reaping
	* activity is definitely inactive.
	*/
	boolean_t
	kmem_cache_reap_active(void)
	{

	return (B_FALSE);
	}

	/*
	* Reap (almost) everything soon.
	*
	* Note: this does not wait for the reap-tasks to complete. Caller
	* should use kmem_cache_reap_active() (above) and/or moderation to
	* avoid scheduling too many reap-tasks.
	*/
	#ifdef _KERNEL
	void
	kmem_cache_reap_soon(kmem_cache_t *cache)
	{
	#ifndef KMEM_DEBUG
	#if __FreeBSD_version >= 1300043
	uma_zone_reclaim(cache->kc_zone, UMA_RECLAIM_DRAIN);
	#else
	zone_drain(cache->kc_zone);
	#endif
	#endif
	}

	void
	kmem_reap(void)
	{
	#if __FreeBSD_version >= 1300043
	uma_reclaim(UMA_RECLAIM_TRIM);
	#else
	uma_reclaim();
	#endif
	}
	#else
	void
	kmem_cache_reap_soon(kmem_cache_t *cache __unused)
	{
	}

	void
	kmem_reap(void)
	{
	}
	#endif

	int
	kmem_debugging(void)
	{
	return (0);
	}

	void *
	calloc(size_t n, size_t s)
	{
	return (kmem_zalloc(n * s, KM_NOSLEEP));
	}

	char *
	kmem_vasprintf(const char *fmt, va_list adx)
	{
	char *msg;
	va_list adx2;

	va_copy(adx2, adx);
	msg = kmem_alloc(vsnprintf(NULL, 0, fmt, adx) + 1, KM_SLEEP);
	(void) vsprintf(msg, fmt, adx2);
	va_end(adx2);

	return (msg);
	}

	#include <vm/uma.h>
	#include <vm/uma_int.h>
	#ifdef KMEM_DEBUG
	#error "KMEM_DEBUG not currently supported"
	#endif

	uint64_t
	spl_kmem_cache_inuse(kmem_cache_t *cache)
	{
	return (uma_zone_get_cur(cache->kc_zone));
	}

	uint64_t
	spl_kmem_cache_entry_size(kmem_cache_t *cache)
	{
	return (cache->kc_zone->uz_size);
	}

	/*
	* Register a move callback for cache defragmentation.
	* XXX: Unimplemented but harmless to stub out for now.
	*/
	void
	spl_kmem_cache_set_move(kmem_cache_t *skc,
	kmem_cbrc_t (move)(void , void , size_t, void *))
	{
	- ASSERT(move != NULL);
	+ ASSERT3P(move, !=, NULL);
	}

	#ifdef KMEM_DEBUG
	void kmem_show(void *);
	void
	kmem_show(void *dummy __unused)
	{
	struct kmem_item *i;

	mtx_lock(&kmem_items_mtx);
	if (LIST_EMPTY(&kmem_items))
	printf("KMEM_DEBUG: No leaked elements.\n");
	else {
	printf("KMEM_DEBUG: Leaked elements:\n\n");
	LIST_FOREACH(i, &kmem_items, next) {
	printf("address=%p\n", i);
	stack_print_ddb(&i->stack);
	printf("\n");
	}
	}
	mtx_unlock(&kmem_items_mtx);
	}

	SYSUNINIT(sol_kmem, SI_SUB_CPU, SI_ORDER_FIRST, kmem_show, NULL);
	#endif /* KMEM_DEBUG */
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/spl_kstat.c b/sys/contrib/openzfs/module/os/freebsd/spl/spl_kstat.c
	index 38a7b434712e..059ada235c4a 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/spl_kstat.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/spl_kstat.c
	@@ -1,510 +1,510 @@
	/*
	* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	* Links to Illumos.org for more information on kstat function:
	* [1] https://illumos.org/man/1M/kstat
	* [2] https://illumos.org/man/9f/kstat_create
	*/

	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/kernel.h>
	#include <sys/systm.h>
	#include <sys/malloc.h>
	#include <sys/sysctl.h>
	#include <sys/kstat.h>
	#include <sys/sbuf.h>

	static MALLOC_DEFINE(M_KSTAT, "kstat_data", "Kernel statistics");

	SYSCTL_ROOT_NODE(OID_AUTO, kstat, CTLFLAG_RW, 0, "Kernel statistics");

	void
	__kstat_set_raw_ops(kstat_t *ksp,
	int (headers)(char buf, size_t size),
	int (data)(char buf, size_t size, void *data),
	void (addr)(kstat_t *ksp, loff_t index))
	{
	ksp->ks_raw_ops.headers = headers;
	ksp->ks_raw_ops.data = data;
	ksp->ks_raw_ops.addr = addr;
	}

	void
	__kstat_set_seq_raw_ops(kstat_t *ksp,
	int (headers)(struct seq_file f),
	int (data)(char buf, size_t size, void *data),
	void (addr)(kstat_t *ksp, loff_t index))
	{
	ksp->ks_raw_ops.seq_headers = headers;
	ksp->ks_raw_ops.data = data;
	ksp->ks_raw_ops.addr = addr;
	}

	static int
	kstat_default_update(kstat_t *ksp, int rw)
	{
	- ASSERT(ksp != NULL);
	+ ASSERT3P(ksp, !=, NULL);

	if (rw == KSTAT_WRITE)
	return (EACCES);

	return (0);
	}

	static int
	kstat_resize_raw(kstat_t *ksp)
	{
	if (ksp->ks_raw_bufsize == KSTAT_RAW_MAX)
	return (ENOMEM);

	free(ksp->ks_raw_buf, M_TEMP);
	ksp->ks_raw_bufsize = MIN(ksp->ks_raw_bufsize * 2, KSTAT_RAW_MAX);
	ksp->ks_raw_buf = malloc(ksp->ks_raw_bufsize, M_TEMP, M_WAITOK);

	return (0);
	}

	static void *
	kstat_raw_default_addr(kstat_t *ksp, loff_t n)
	{
	if (n == 0)
	return (ksp->ks_data);
	return (NULL);
	}

	static int
	kstat_sysctl(SYSCTL_HANDLER_ARGS)
	{
	kstat_t *ksp = arg1;
	kstat_named_t *ksent;
	uint64_t val;

	ksent = ksp->ks_data;
	/* Select the correct element */
	ksent += arg2;
	/* Update the aggsums before reading */
	(void) ksp->ks_update(ksp, KSTAT_READ);
	val = ksent->value.ui64;

	return (sysctl_handle_64(oidp, &val, 0, req));
	}

	static int
	kstat_sysctl_string(SYSCTL_HANDLER_ARGS)
	{
	kstat_t *ksp = arg1;
	kstat_named_t *ksent = ksp->ks_data;
	char *val;
	uint32_t len = 0;

	/* Select the correct element */
	ksent += arg2;
	/* Update the aggsums before reading */
	(void) ksp->ks_update(ksp, KSTAT_READ);
	val = KSTAT_NAMED_STR_PTR(ksent);
	len = KSTAT_NAMED_STR_BUFLEN(ksent);
	val[len-1] = '\0';

	return (sysctl_handle_string(oidp, val, len, req));
	}

	static int
	kstat_sysctl_io(SYSCTL_HANDLER_ARGS)
	{
	struct sbuf *sb;
	kstat_t *ksp = arg1;
	kstat_io_t *kip = ksp->ks_data;
	int rc;

	sb = sbuf_new_auto();
	if (sb == NULL)
	return (ENOMEM);
	/* Update the aggsums before reading */
	(void) ksp->ks_update(ksp, KSTAT_READ);

	/* though wlentime & friends are signed, they will never be negative */
	sbuf_printf(sb,
	"%-8llu %-8llu %-8u %-8u %-8llu %-8llu "
	"%-8llu %-8llu %-8llu %-8llu %-8u %-8u\n",
	kip->nread, kip->nwritten,
	kip->reads, kip->writes,
	kip->wtime, kip->wlentime, kip->wlastupdate,
	kip->rtime, kip->rlentime, kip->rlastupdate,
	kip->wcnt, kip->rcnt);
	rc = sbuf_finish(sb);
	if (rc == 0)
	rc = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb));
	sbuf_delete(sb);
	return (rc);
	}

	static int
	kstat_sysctl_raw(SYSCTL_HANDLER_ARGS)
	{
	struct sbuf *sb;
	void *data;
	kstat_t *ksp = arg1;
	void (addr_op)(kstat_t *ksp, loff_t index);
	int n, has_header, rc = 0;

	sb = sbuf_new_auto();
	if (sb == NULL)
	return (ENOMEM);

	if (ksp->ks_raw_ops.addr)
	addr_op = ksp->ks_raw_ops.addr;
	else
	addr_op = kstat_raw_default_addr;

	mutex_enter(ksp->ks_lock);

	/* Update the aggsums before reading */
	(void) ksp->ks_update(ksp, KSTAT_READ);

	ksp->ks_raw_bufsize = PAGE_SIZE;
	ksp->ks_raw_buf = malloc(PAGE_SIZE, M_TEMP, M_WAITOK);

	n = 0;
	has_header = (ksp->ks_raw_ops.headers \|\|
	ksp->ks_raw_ops.seq_headers);

	restart_headers:
	if (ksp->ks_raw_ops.headers) {
	rc = ksp->ks_raw_ops.headers(
	ksp->ks_raw_buf, ksp->ks_raw_bufsize);
	} else if (ksp->ks_raw_ops.seq_headers) {
	struct seq_file f;

	f.sf_buf = ksp->ks_raw_buf;
	f.sf_size = ksp->ks_raw_bufsize;
	rc = ksp->ks_raw_ops.seq_headers(&f);
	}
	if (has_header) {
	if (rc == ENOMEM && !kstat_resize_raw(ksp))
	goto restart_headers;
	if (rc == 0)
	sbuf_printf(sb, "\n%s", ksp->ks_raw_buf);
	}

	while ((data = addr_op(ksp, n)) != NULL) {
	restart:
	if (ksp->ks_raw_ops.data) {
	rc = ksp->ks_raw_ops.data(ksp->ks_raw_buf,
	ksp->ks_raw_bufsize, data);
	if (rc == ENOMEM && !kstat_resize_raw(ksp))
	goto restart;
	if (rc == 0)
	sbuf_printf(sb, "%s", ksp->ks_raw_buf);

	} else {
	- ASSERT(ksp->ks_ndata == 1);
	+ ASSERT3U(ksp->ks_ndata, ==, 1);
	sbuf_hexdump(sb, ksp->ks_data,
	ksp->ks_data_size, NULL, 0);
	}
	n++;
	}
	free(ksp->ks_raw_buf, M_TEMP);
	mutex_exit(ksp->ks_lock);
	sbuf_trim(sb);
	rc = sbuf_finish(sb);
	if (rc == 0)
	rc = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb));
	sbuf_delete(sb);
	return (rc);
	}

	kstat_t *
	__kstat_create(const char module, int instance, const char name,
	const char *class, uchar_t ks_type, uint_t ks_ndata, uchar_t flags)
	{
	char buf[KSTAT_STRLEN];
	struct sysctl_oid *root;
	kstat_t *ksp;
	char *pool;

	KASSERT(instance == 0, ("instance=%d", instance));
	if ((ks_type == KSTAT_TYPE_INTR) \|\| (ks_type == KSTAT_TYPE_IO))
	- ASSERT(ks_ndata == 1);
	+ ASSERT3U(ks_ndata, ==, 1);

	if (class == NULL)
	class = "misc";

	/*
	* Allocate the main structure. We don't need to keep a copy of
	* module in here, because it is only used for sysctl node creation
	* done in this function.
	*/
	ksp = malloc(sizeof (*ksp), M_KSTAT, M_WAITOK\|M_ZERO);

	ksp->ks_crtime = gethrtime();
	ksp->ks_snaptime = ksp->ks_crtime;
	ksp->ks_instance = instance;
	(void) strlcpy(ksp->ks_name, name, KSTAT_STRLEN);
	(void) strlcpy(ksp->ks_class, class, KSTAT_STRLEN);
	ksp->ks_type = ks_type;
	ksp->ks_flags = flags;
	ksp->ks_update = kstat_default_update;

	mutex_init(&ksp->ks_private_lock, NULL, MUTEX_DEFAULT, NULL);
	ksp->ks_lock = &ksp->ks_private_lock;

	switch (ksp->ks_type) {
	case KSTAT_TYPE_RAW:
	ksp->ks_ndata = 1;
	ksp->ks_data_size = ks_ndata;
	break;
	case KSTAT_TYPE_NAMED:
	ksp->ks_ndata = ks_ndata;
	ksp->ks_data_size = ks_ndata * sizeof (kstat_named_t);
	break;
	case KSTAT_TYPE_INTR:
	ksp->ks_ndata = ks_ndata;
	ksp->ks_data_size = ks_ndata * sizeof (kstat_intr_t);
	break;
	case KSTAT_TYPE_IO:
	ksp->ks_ndata = ks_ndata;
	ksp->ks_data_size = ks_ndata * sizeof (kstat_io_t);
	break;
	case KSTAT_TYPE_TIMER:
	ksp->ks_ndata = ks_ndata;
	ksp->ks_data_size = ks_ndata * sizeof (kstat_timer_t);
	break;
	default:
	panic("Undefined kstat type %d\n", ksp->ks_type);
	}

	if (ksp->ks_flags & KSTAT_FLAG_VIRTUAL)
	ksp->ks_data = NULL;
	else
	ksp->ks_data = kmem_zalloc(ksp->ks_data_size, KM_SLEEP);

	/*
	* Some kstats use a module name like "zfs/poolname" to distinguish a
	* set of kstats belonging to a specific pool. Split on '/' to add an
	* extra node for the pool name if needed.
	*/
	(void) strlcpy(buf, module, KSTAT_STRLEN);
	module = buf;
	pool = strchr(module, '/');
	if (pool != NULL)
	*pool++ = '\0';

	/*
	* Create sysctl tree for those statistics:
	*
	* kstat.<module>[.<pool>].<class>.<name>
	*/
	sysctl_ctx_init(&ksp->ks_sysctl_ctx);
	root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx,
	SYSCTL_STATIC_CHILDREN(_kstat), OID_AUTO, module, CTLFLAG_RW, 0,
	"");
	if (root == NULL) {
	printf("%s: Cannot create kstat.%s tree!\n", __func__, module);
	sysctl_ctx_free(&ksp->ks_sysctl_ctx);
	free(ksp, M_KSTAT);
	return (NULL);
	}
	if (pool != NULL) {
	root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(root), OID_AUTO, pool, CTLFLAG_RW, 0, "");
	if (root == NULL) {
	printf("%s: Cannot create kstat.%s.%s tree!\n",
	__func__, module, pool);
	sysctl_ctx_free(&ksp->ks_sysctl_ctx);
	free(ksp, M_KSTAT);
	return (NULL);
	}
	}
	root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx, SYSCTL_CHILDREN(root),
	OID_AUTO, class, CTLFLAG_RW, 0, "");
	if (root == NULL) {
	if (pool != NULL)
	printf("%s: Cannot create kstat.%s.%s.%s tree!\n",
	__func__, module, pool, class);
	else
	printf("%s: Cannot create kstat.%s.%s tree!\n",
	__func__, module, class);
	sysctl_ctx_free(&ksp->ks_sysctl_ctx);
	free(ksp, M_KSTAT);
	return (NULL);
	}
	if (ksp->ks_type == KSTAT_TYPE_NAMED) {
	root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(root),
	OID_AUTO, name, CTLFLAG_RW, 0, "");
	if (root == NULL) {
	if (pool != NULL)
	printf("%s: Cannot create kstat.%s.%s.%s.%s "
	"tree!\n", __func__, module, pool, class,
	name);
	else
	printf("%s: Cannot create kstat.%s.%s.%s "
	"tree!\n", __func__, module, class, name);
	sysctl_ctx_free(&ksp->ks_sysctl_ctx);
	free(ksp, M_KSTAT);
	return (NULL);
	}

	}
	ksp->ks_sysctl_root = root;

	return (ksp);
	}

	static void
	kstat_install_named(kstat_t *ksp)
	{
	kstat_named_t *ksent;
	char *namelast;
	int typelast;

	ksent = ksp->ks_data;

	VERIFY((ksp->ks_flags & KSTAT_FLAG_VIRTUAL) \|\| ksent != NULL);

	typelast = 0;
	namelast = NULL;

	for (int i = 0; i < ksp->ks_ndata; i++, ksent++) {
	if (ksent->data_type != 0) {
	typelast = ksent->data_type;
	namelast = ksent->name;
	}
	switch (typelast) {
	case KSTAT_DATA_CHAR:
	/* Not Implemented */
	break;
	case KSTAT_DATA_INT32:
	SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, namelast,
	CTLTYPE_S32 \| CTLFLAG_RD \| CTLFLAG_MPSAFE,
	ksp, i, kstat_sysctl, "I", namelast);
	break;
	case KSTAT_DATA_UINT32:
	SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, namelast,
	CTLTYPE_U32 \| CTLFLAG_RD \| CTLFLAG_MPSAFE,
	ksp, i, kstat_sysctl, "IU", namelast);
	break;
	case KSTAT_DATA_INT64:
	SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, namelast,
	CTLTYPE_S64 \| CTLFLAG_RD \| CTLFLAG_MPSAFE,
	ksp, i, kstat_sysctl, "Q", namelast);
	break;
	case KSTAT_DATA_UINT64:
	SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, namelast,
	CTLTYPE_U64 \| CTLFLAG_RD \| CTLFLAG_MPSAFE,
	ksp, i, kstat_sysctl, "QU", namelast);
	break;
	case KSTAT_DATA_LONG:
	SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, namelast,
	CTLTYPE_LONG \| CTLFLAG_RD \| CTLFLAG_MPSAFE,
	ksp, i, kstat_sysctl, "L", namelast);
	break;
	case KSTAT_DATA_ULONG:
	SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, namelast,
	CTLTYPE_ULONG \| CTLFLAG_RD \| CTLFLAG_MPSAFE,
	ksp, i, kstat_sysctl, "LU", namelast);
	break;
	case KSTAT_DATA_STRING:
	SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, namelast,
	CTLTYPE_STRING \| CTLFLAG_RD \| CTLFLAG_MPSAFE,
	ksp, i, kstat_sysctl_string, "A", namelast);
	break;
	default:
	panic("unsupported type: %d", typelast);
	}
	}
	}

	void
	kstat_install(kstat_t *ksp)
	{
	struct sysctl_oid *root;

	if (ksp->ks_ndata == UINT32_MAX)
	- VERIFY(ksp->ks_type == KSTAT_TYPE_RAW);
	+ VERIFY3U(ksp->ks_type, ==, KSTAT_TYPE_RAW);

	switch (ksp->ks_type) {
	case KSTAT_TYPE_NAMED:
	return (kstat_install_named(ksp));
	case KSTAT_TYPE_RAW:
	if (ksp->ks_raw_ops.data) {
	root = SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, ksp->ks_name, CTLTYPE_STRING \| CTLFLAG_RD
	\| CTLFLAG_MPSAFE \| CTLFLAG_SKIP,
	ksp, 0, kstat_sysctl_raw, "A", ksp->ks_name);
	} else {
	root = SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, ksp->ks_name, CTLTYPE_OPAQUE \| CTLFLAG_RD
	\| CTLFLAG_MPSAFE \| CTLFLAG_SKIP,
	ksp, 0, kstat_sysctl_raw, "", ksp->ks_name);
	}
	break;
	case KSTAT_TYPE_IO:
	root = SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
	SYSCTL_CHILDREN(ksp->ks_sysctl_root),
	OID_AUTO, ksp->ks_name,
	CTLTYPE_STRING \| CTLFLAG_RD \| CTLFLAG_MPSAFE,
	ksp, 0, kstat_sysctl_io, "A", ksp->ks_name);
	break;
	case KSTAT_TYPE_TIMER:
	case KSTAT_TYPE_INTR:
	default:
	panic("unsupported kstat type %d\n", ksp->ks_type);
	}
	- VERIFY(root != NULL);
	+ VERIFY3P(root, !=, NULL);
	ksp->ks_sysctl_root = root;
	}

	void
	kstat_delete(kstat_t *ksp)
	{

	sysctl_ctx_free(&ksp->ks_sysctl_ctx);
	ksp->ks_lock = NULL;
	mutex_destroy(&ksp->ks_private_lock);
	if (!(ksp->ks_flags & KSTAT_FLAG_VIRTUAL))
	kmem_free(ksp->ks_data, ksp->ks_data_size);
	free(ksp, M_KSTAT);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/spl_string.c b/sys/contrib/openzfs/module/os/freebsd/spl/spl_string.c
	index d13b64b4cd26..00b1df766ab9 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/spl_string.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/spl_string.c
	@@ -1,107 +1,107 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*
	* $FreeBSD$
	*/
	/*
	* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/string.h>
	#include <sys/kmem.h>
	#include <machine/stdarg.h>

	#define IS_DIGIT(c) ((c) >= '0' && (c) <= '9')

	#define IS_ALPHA(c) \
	(((c) >= 'a' && (c) <= 'z') \|\| ((c) >= 'A' && (c) <= 'Z'))

	char *
	strpbrk(const char s, const char b)
	{
	const char *p;

	do {
	for (p = b; p != '\0' && p != *s; ++p)
	;
	if (*p != '\0')
	return ((char *)s);
	} while (*s++);

	return (NULL);
	}

	/*
	* Convert a string into a valid C identifier by replacing invalid
	* characters with '_'. Also makes sure the string is nul-terminated
	* and takes up at most n bytes.
	*/
	void
	strident_canon(char *s, size_t n)
	{
	char c;
	char *end = s + n - 1;

	if ((c = *s) == 0)
	return;

	if (!IS_ALPHA(c) && c != '_')
	*s = '_';

	while (s < end && ((c = *(++s)) != 0)) {
	if (!IS_ALPHA(c) && !IS_DIGIT(c) && c != '_')
	*s = '_';
	}
	*s = 0;
	}

	/*
	* Do not change the length of the returned string; it must be freed
	* with strfree().
	*/
	char *
	kmem_asprintf(const char *fmt, ...)
	{
	int size;
	va_list adx;
	char *buf;

	va_start(adx, fmt);
	size = vsnprintf(NULL, 0, fmt, adx) + 1;
	va_end(adx);

	buf = kmem_alloc(size, KM_SLEEP);

	va_start(adx, fmt);
	(void) vsnprintf(buf, size, fmt, adx);
	va_end(adx);

	return (buf);
	}

	void
	kmem_strfree(char *str)
	{
	- ASSERT(str != NULL);
	+ ASSERT3P(str, !=, NULL);
	kmem_free(str, strlen(str) + 1);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/spl_sysevent.c b/sys/contrib/openzfs/module/os/freebsd/spl/spl_sysevent.c
	index 8c0e495681e9..d5d50080fafd 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/spl_sysevent.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/spl_sysevent.c
	@@ -1,262 +1,262 @@
	/*
	* Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
	* Copyright (c) 2020 iXsystems, Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/kernel.h>
	#include <sys/systm.h>
	#include <sys/malloc.h>
	#include <sys/kmem.h>
	#include <sys/list.h>
	#include <sys/proc.h>
	#include <sys/sbuf.h>
	#include <sys/nvpair.h>
	#include <sys/sunddi.h>
	#include <sys/sysevent.h>
	#include <sys/fm/protocol.h>
	#include <sys/fm/util.h>
	#include <sys/bus.h>

	static int
	log_sysevent(nvlist_t *event)
	{
	struct sbuf *sb;
	const char *type;
	char typestr[128];
	nvpair_t *elem = NULL;

	sb = sbuf_new_auto();
	if (sb == NULL)
	return (ENOMEM);
	type = NULL;

	while ((elem = nvlist_next_nvpair(event, elem)) != NULL) {
	switch (nvpair_type(elem)) {
	case DATA_TYPE_BOOLEAN:
	{
	boolean_t value;

	(void) nvpair_value_boolean_value(elem, &value);
	sbuf_printf(sb, " %s=%s", nvpair_name(elem),
	value ? "true" : "false");
	break;
	}
	case DATA_TYPE_UINT8:
	{
	uint8_t value;

	(void) nvpair_value_uint8(elem, &value);
	sbuf_printf(sb, " %s=%hhu", nvpair_name(elem), value);
	break;
	}
	case DATA_TYPE_INT32:
	{
	int32_t value;

	(void) nvpair_value_int32(elem, &value);
	sbuf_printf(sb, " %s=%jd", nvpair_name(elem),
	(intmax_t)value);
	break;
	}
	case DATA_TYPE_UINT32:
	{
	uint32_t value;

	(void) nvpair_value_uint32(elem, &value);
	sbuf_printf(sb, " %s=%ju", nvpair_name(elem),
	(uintmax_t)value);
	break;
	}
	case DATA_TYPE_INT64:
	{
	int64_t value;

	(void) nvpair_value_int64(elem, &value);
	sbuf_printf(sb, " %s=%jd", nvpair_name(elem),
	(intmax_t)value);
	break;
	}
	case DATA_TYPE_UINT64:
	{
	uint64_t value;

	(void) nvpair_value_uint64(elem, &value);
	sbuf_printf(sb, " %s=%ju", nvpair_name(elem),
	(uintmax_t)value);
	break;
	}
	case DATA_TYPE_STRING:
	{
	char *value;

	(void) nvpair_value_string(elem, &value);
	sbuf_printf(sb, " %s=%s", nvpair_name(elem), value);
	if (strcmp(FM_CLASS, nvpair_name(elem)) == 0)
	type = value;
	break;
	}
	case DATA_TYPE_UINT8_ARRAY:
	{
	uint8_t *value;
	uint_t ii, nelem;

	(void) nvpair_value_uint8_array(elem, &value, &nelem);
	sbuf_printf(sb, " %s=", nvpair_name(elem));
	for (ii = 0; ii < nelem; ii++)
	sbuf_printf(sb, "%02hhx", value[ii]);
	break;
	}
	case DATA_TYPE_UINT16_ARRAY:
	{
	uint16_t *value;
	uint_t ii, nelem;

	(void) nvpair_value_uint16_array(elem, &value, &nelem);
	sbuf_printf(sb, " %s=", nvpair_name(elem));
	for (ii = 0; ii < nelem; ii++)
	sbuf_printf(sb, "%04hx", value[ii]);
	break;
	}
	case DATA_TYPE_UINT32_ARRAY:
	{
	uint32_t *value;
	uint_t ii, nelem;

	(void) nvpair_value_uint32_array(elem, &value, &nelem);
	sbuf_printf(sb, " %s=", nvpair_name(elem));
	for (ii = 0; ii < nelem; ii++)
	sbuf_printf(sb, "%08jx", (uintmax_t)value[ii]);
	break;
	}
	case DATA_TYPE_INT64_ARRAY:
	{
	int64_t *value;
	uint_t ii, nelem;

	(void) nvpair_value_int64_array(elem, &value, &nelem);
	sbuf_printf(sb, " %s=", nvpair_name(elem));
	for (ii = 0; ii < nelem; ii++)
	sbuf_printf(sb, "%016lld",
	(long long)value[ii]);
	break;
	}
	case DATA_TYPE_UINT64_ARRAY:
	{
	uint64_t *value;
	uint_t ii, nelem;

	(void) nvpair_value_uint64_array(elem, &value, &nelem);
	sbuf_printf(sb, " %s=", nvpair_name(elem));
	for (ii = 0; ii < nelem; ii++)
	sbuf_printf(sb, "%016jx", (uintmax_t)value[ii]);
	break;
	}
	case DATA_TYPE_STRING_ARRAY:
	{
	char **strarr;
	uint_t ii, nelem;

	(void) nvpair_value_string_array(elem, &strarr, &nelem);

	for (ii = 0; ii < nelem; ii++) {
	if (strarr[ii] == NULL) {
	sbuf_printf(sb, " <NULL>");
	continue;
	}

	sbuf_printf(sb, " %s", strarr[ii]);
	if (strcmp(FM_CLASS, strarr[ii]) == 0)
	type = strarr[ii];
	}
	break;
	}
	case DATA_TYPE_NVLIST:
	/* XXX - requires recursing in log_sysevent */
	break;
	default:
	printf("%s: type %d is not implemented\n", __func__,
	nvpair_type(elem));
	break;
	}
	}

	if (sbuf_finish(sb) != 0) {
	sbuf_delete(sb);
	return (ENOMEM);
	}

	if (type == NULL)
	type = "";
	if (strncmp(type, "ESC_ZFS_", 8) == 0) {
	snprintf(typestr, sizeof (typestr), "misc.fs.zfs.%s", type + 8);
	type = typestr;
	}
	devctl_notify("ZFS", "ZFS", type, sbuf_data(sb));
	sbuf_delete(sb);

	return (0);
	}

	static void
	sysevent_worker(void *arg __unused)
	{
	zfs_zevent_t *ze;
	nvlist_t *event;
	uint64_t dropped = 0;
	uint64_t dst_size;
	int error;

	zfs_zevent_init(&ze);
	for (;;) {
	dst_size = 131072;
	dropped = 0;
	event = NULL;
	error = zfs_zevent_next(ze, &event,
	&dst_size, &dropped);
	if (error) {
	error = zfs_zevent_wait(ze);
	if (error == ESHUTDOWN)
	break;
	} else {
	- VERIFY(event != NULL);
	+ VERIFY3P(event, !=, NULL);
	log_sysevent(event);
	nvlist_free(event);
	}
	}
	zfs_zevent_destroy(ze);
	kthread_exit();
	}

	void
	ddi_sysevent_init(void)
	{
	kproc_kthread_add(sysevent_worker, NULL, &system_proc, NULL, 0, 0,
	"zfskern", "sysevent");
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/spl_uio.c b/sys/contrib/openzfs/module/os/freebsd/spl/spl_uio.c
	index 59a781ee1b64..0bf251a1edac 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/spl_uio.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/spl_uio.c
	@@ -1,107 +1,107 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
	/* All Rights Reserved */

	/*
	* University Copyright- Copyright (c) 1982, 1986, 1988
	* The Regents of the University of California
	* All Rights Reserved
	*
	* University Acknowledgment- Portions of this document are derived from
	* software developed by the University of California, Berkeley, and its
	* contributors.
	*/

	/*
	* $FreeBSD$
	*/

	#include <sys/param.h>
	#include <sys/uio_impl.h>
	#include <sys/vnode.h>
	#include <sys/zfs_znode.h>

	int
	zfs_uiomove(void cp, size_t n, zfs_uio_rw_t dir, zfs_uio_t uio)
	{
	- ASSERT(zfs_uio_rw(uio) == dir);
	+ ASSERT3U(zfs_uio_rw(uio), ==, dir);
	return (uiomove(cp, (int)n, GET_UIO_STRUCT(uio)));
	}

	/*
	* same as zfs_uiomove() but doesn't modify uio structure.
	* return in cbytes how many bytes were copied.
	*/
	int
	zfs_uiocopy(void p, size_t n, zfs_uio_rw_t rw, zfs_uio_t uio, size_t *cbytes)
	{
	struct iovec small_iovec[1];
	struct uio small_uio_clone;
	struct uio *uio_clone;
	int error;

	ASSERT3U(zfs_uio_rw(uio), ==, rw);
	if (zfs_uio_iovcnt(uio) == 1) {
	small_uio_clone = *(GET_UIO_STRUCT(uio));
	small_iovec[0] = *(GET_UIO_STRUCT(uio)->uio_iov);
	small_uio_clone.uio_iov = small_iovec;
	uio_clone = &small_uio_clone;
	} else {
	uio_clone = cloneuio(GET_UIO_STRUCT(uio));
	}

	error = vn_io_fault_uiomove(p, n, uio_clone);
	*cbytes = zfs_uio_resid(uio) - uio_clone->uio_resid;
	if (uio_clone != &small_uio_clone)
	free(uio_clone, M_IOV);
	return (error);
	}

	/*
	* Drop the next n chars out of *uiop.
	*/
	void
	zfs_uioskip(zfs_uio_t *uio, size_t n)
	{
	zfs_uio_seg_t segflg;

	/* For the full compatibility with illumos. */
	if (n > zfs_uio_resid(uio))
	return;

	segflg = zfs_uio_segflg(uio);
	zfs_uio_segflg(uio) = UIO_NOCOPY;
	zfs_uiomove(NULL, n, zfs_uio_rw(uio), uio);
	zfs_uio_segflg(uio) = segflg;
	}

	int
	zfs_uio_fault_move(void p, size_t n, zfs_uio_rw_t dir, zfs_uio_t uio)
	{
	- ASSERT(zfs_uio_rw(uio) == dir);
	+ ASSERT3U(zfs_uio_rw(uio), ==, dir);
	return (vn_io_fault_uiomove(p, n, GET_UIO_STRUCT(uio)));
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/spl/spl_vfs.c b/sys/contrib/openzfs/module/os/freebsd/spl/spl_vfs.c
	index 54d3dce316d6..60ea627e975b 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/spl/spl_vfs.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/spl/spl_vfs.c
	@@ -1,287 +1,287 @@
	/*
	* Copyright (c) 2006-2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/kernel.h>
	#include <sys/systm.h>
	#include <sys/malloc.h>
	#include <sys/mount.h>
	#include <sys/cred.h>
	#include <sys/vfs.h>
	#include <sys/priv.h>
	#include <sys/libkern.h>

	#include <sys/mutex.h>
	#include <sys/vnode.h>
	#include <sys/taskq.h>

	#include <sys/ccompat.h>

	MALLOC_DECLARE(M_MOUNT);

	void
	vfs_setmntopt(vfs_t vfsp, const char name, const char *arg,
	int flags __unused)
	{
	struct vfsopt *opt;
	size_t namesize;
	int locked;

	if (!(locked = mtx_owned(MNT_MTX(vfsp))))
	MNT_ILOCK(vfsp);

	if (vfsp->mnt_opt == NULL) {
	void *opts;

	MNT_IUNLOCK(vfsp);
	opts = malloc(sizeof (*vfsp->mnt_opt), M_MOUNT, M_WAITOK);
	MNT_ILOCK(vfsp);
	if (vfsp->mnt_opt == NULL) {
	vfsp->mnt_opt = opts;
	TAILQ_INIT(vfsp->mnt_opt);
	} else {
	free(opts, M_MOUNT);
	}
	}

	MNT_IUNLOCK(vfsp);

	opt = malloc(sizeof (*opt), M_MOUNT, M_WAITOK);
	namesize = strlen(name) + 1;
	opt->name = malloc(namesize, M_MOUNT, M_WAITOK);
	strlcpy(opt->name, name, namesize);
	opt->pos = -1;
	opt->seen = 1;
	if (arg == NULL) {
	opt->value = NULL;
	opt->len = 0;
	} else {
	opt->len = strlen(arg) + 1;
	opt->value = malloc(opt->len, M_MOUNT, M_WAITOK);
	bcopy(arg, opt->value, opt->len);
	}

	MNT_ILOCK(vfsp);
	TAILQ_INSERT_TAIL(vfsp->mnt_opt, opt, link);
	if (!locked)
	MNT_IUNLOCK(vfsp);
	}

	void
	vfs_clearmntopt(vfs_t vfsp, const char name)
	{
	int locked;

	if (!(locked = mtx_owned(MNT_MTX(vfsp))))
	MNT_ILOCK(vfsp);
	vfs_deleteopt(vfsp->mnt_opt, name);
	if (!locked)
	MNT_IUNLOCK(vfsp);
	}

	int
	vfs_optionisset(const vfs_t vfsp, const char opt, char **argp)
	{
	struct vfsoptlist *opts = vfsp->mnt_optnew;
	int error;

	if (opts == NULL)
	return (0);
	error = vfs_getopt(opts, opt, (void **)argp, NULL);
	return (error != 0 ? 0 : 1);
	}

	int
	mount_snapshot(kthread_t td, vnode_t vpp, const char fstype, char *fspath,
	char *fspec, int fsflags)
	{
	struct vfsconf *vfsp;
	struct mount *mp;
	vnode_t vp, mvp;
	struct ucred *cr;
	int error;

	ASSERT_VOP_ELOCKED(*vpp, "mount_snapshot");

	vp = *vpp;
	*vpp = NULL;
	error = 0;

	/*
	* Be ultra-paranoid about making sure the type and fspath
	* variables will fit in our mp buffers, including the
	* terminating NUL.
	*/
	if (strlen(fstype) >= MFSNAMELEN \|\| strlen(fspath) >= MNAMELEN)
	error = ENAMETOOLONG;
	if (error == 0 && (vfsp = vfs_byname_kld(fstype, td, &error)) == NULL)
	error = ENODEV;
	if (error == 0 && vp->v_type != VDIR)
	error = ENOTDIR;
	/*
	* We need vnode lock to protect v_mountedhere and vnode interlock
	* to protect v_iflag.
	*/
	if (error == 0) {
	VI_LOCK(vp);
	if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
	vp->v_iflag \|= VI_MOUNT;
	else
	error = EBUSY;
	VI_UNLOCK(vp);
	}
	if (error != 0) {
	vput(vp);
	return (error);
	}
	vn_seqc_write_begin(vp);
	VOP_UNLOCK1(vp);

	/*
	* Allocate and initialize the filesystem.
	* We don't want regular user that triggered snapshot mount to be able
	* to unmount it, so pass credentials of the parent mount.
	*/
	mp = vfs_mount_alloc(vp, vfsp, fspath, vp->v_mount->mnt_cred);

	mp->mnt_optnew = NULL;
	vfs_setmntopt(mp, "from", fspec, 0);
	mp->mnt_optnew = mp->mnt_opt;
	mp->mnt_opt = NULL;

	/*
	* Set the mount level flags.
	*/
	mp->mnt_flag = fsflags & MNT_UPDATEMASK;
	/*
	* Snapshots are always read-only.
	*/
	mp->mnt_flag \|= MNT_RDONLY;
	/*
	* We don't want snapshots to allow access to vulnerable setuid
	* programs, so we turn off setuid when mounting snapshots.
	*/
	mp->mnt_flag \|= MNT_NOSUID;
	/*
	* We don't want snapshots to be visible in regular
	* mount(8) and df(1) output.
	*/
	mp->mnt_flag \|= MNT_IGNORE;
	/*
	* XXX: This is evil, but we can't mount a snapshot as a regular user.
	* XXX: Is is safe when snapshot is mounted from within a jail?
	*/
	cr = td->td_ucred;
	td->td_ucred = kcred;
	error = VFS_MOUNT(mp);
	td->td_ucred = cr;

	if (error != 0) {
	/*
	* Clear VI_MOUNT and decrement the use count "atomically",
	* under the vnode lock. This is not strictly required,
	* but makes it easier to reason about the life-cycle and
	* ownership of the covered vnode.
	*/
	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY);
	VI_LOCK(vp);
	vp->v_iflag &= ~VI_MOUNT;
	VI_UNLOCK(vp);
	vn_seqc_write_end(vp);
	vput(vp);
	vfs_unbusy(mp);
	vfs_freeopts(mp->mnt_optnew);
	mp->mnt_vnodecovered = NULL;
	vfs_mount_destroy(mp);
	return (error);
	}

	if (mp->mnt_opt != NULL)
	vfs_freeopts(mp->mnt_opt);
	mp->mnt_opt = mp->mnt_optnew;
	(void) VFS_STATFS(mp, &mp->mnt_stat);

	/*
	* Prevent external consumers of mount options from reading
	* mnt_optnew.
	*/
	mp->mnt_optnew = NULL;

	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY);
	#ifdef FREEBSD_NAMECACHE
	cache_purge(vp);
	#endif
	VI_LOCK(vp);
	vp->v_iflag &= ~VI_MOUNT;
	#ifdef VIRF_MOUNTPOINT
	vn_irflag_set_locked(vp, VIRF_MOUNTPOINT);
	#endif
	vp->v_mountedhere = mp;
	VI_UNLOCK(vp);
	/* Put the new filesystem on the mount list. */
	mtx_lock(&mountlist_mtx);
	TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
	mtx_unlock(&mountlist_mtx);
	vfs_event_signal(NULL, VQ_MOUNT, 0);
	if (VFS_ROOT(mp, LK_EXCLUSIVE, &mvp))
	panic("mount: lost mount");
	vn_seqc_write_end(vp);
	VOP_UNLOCK1(vp);
	#if __FreeBSD_version >= 1300048
	vfs_op_exit(mp);
	#endif
	vfs_unbusy(mp);
	*vpp = mvp;
	return (0);
	}

	/*
	* Like vn_rele() except if we are going to call VOP_INACTIVE() then do it
	* asynchronously using a taskq. This can avoid deadlocks caused by re-entering
	* the file system as a result of releasing the vnode. Note, file systems
	* already have to handle the race where the vnode is incremented before the
	* inactive routine is called and does its locking.
	*
	* Warning: Excessive use of this routine can lead to performance problems.
	* This is because taskqs throttle back allocation if too many are created.
	*/
	void
	vn_rele_async(vnode_t vp, taskq_t taskq)
	{
	- VERIFY(vp->v_usecount > 0);
	+ VERIFY3U(vp->v_usecount, >, 0);
	if (refcount_release_if_not_last(&vp->v_usecount)) {
	#if __FreeBSD_version < 1300045
	vdrop(vp);
	#endif
	return;
	}
	- VERIFY(taskq_dispatch((taskq_t *)taskq,
	- (task_func_t *)vrele, vp, TQ_SLEEP) != 0);
	+ VERIFY3U(taskq_dispatch((taskq_t *)taskq,
	+ (task_func_t *)vrele, vp, TQ_SLEEP), !=, 0);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/abd_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/abd_os.c
	index 15d3dcef50e7..95a83542fadc 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/abd_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/abd_os.c
	@@ -1,533 +1,508 @@
	/*
	* This file and its contents are supplied under the terms of the
	* Common Development and Distribution License ("CDDL"), version 1.0.
	* You may only use this file in accordance with the terms of version
	* 1.0 of the CDDL.
	*
	* A full copy of the text of the CDDL should have accompanied this
	* source. A copy of the CDDL is also available via the Internet at
	* http://www.illumos.org/license/CDDL.
	*/

	/*
	* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
	* Copyright (c) 2016 by Delphix. All rights reserved.
	*/

	/*
	* See abd.c for a general overview of the arc buffered data (ABD).
	*
	* Using a large proportion of scattered ABDs decreases ARC fragmentation since
	* when we are at the limit of allocatable space, using equal-size chunks will
	* allow us to quickly reclaim enough space for a new large allocation (assuming
	* it is also scattered).
	*
	* ABDs are allocated scattered by default unless the caller uses
	* abd_alloc_linear() or zfs_abd_scatter_enabled is disabled.
	*/

	#include <sys/abd_impl.h>
	#include <sys/param.h>
	#include <sys/types.h>
	#include <sys/zio.h>
	#include <sys/zfs_context.h>
	#include <sys/zfs_znode.h>

	typedef struct abd_stats {
	kstat_named_t abdstat_struct_size;
	kstat_named_t abdstat_scatter_cnt;
	kstat_named_t abdstat_scatter_data_size;
	kstat_named_t abdstat_scatter_chunk_waste;
	kstat_named_t abdstat_linear_cnt;
	kstat_named_t abdstat_linear_data_size;
	} abd_stats_t;

	static abd_stats_t abd_stats = {
	/* Amount of memory occupied by all of the abd_t struct allocations */
	{ "struct_size", KSTAT_DATA_UINT64 },
	/*
	* The number of scatter ABDs which are currently allocated, excluding
	* ABDs which don't own their data (for instance the ones which were
	* allocated through abd_get_offset()).
	*/
	{ "scatter_cnt", KSTAT_DATA_UINT64 },
	/* Amount of data stored in all scatter ABDs tracked by scatter_cnt */
	{ "scatter_data_size", KSTAT_DATA_UINT64 },
	/*
	* The amount of space wasted at the end of the last chunk across all
	* scatter ABDs tracked by scatter_cnt.
	*/
	{ "scatter_chunk_waste", KSTAT_DATA_UINT64 },
	/*
	* The number of linear ABDs which are currently allocated, excluding
	* ABDs which don't own their data (for instance the ones which were
	* allocated through abd_get_offset() and abd_get_from_buf()). If an
	* ABD takes ownership of its buf then it will become tracked.
	*/
	{ "linear_cnt", KSTAT_DATA_UINT64 },
	/* Amount of data stored in all linear ABDs tracked by linear_cnt */
	{ "linear_data_size", KSTAT_DATA_UINT64 },
	};

	struct {
	wmsum_t abdstat_struct_size;
	wmsum_t abdstat_scatter_cnt;
	wmsum_t abdstat_scatter_data_size;
	wmsum_t abdstat_scatter_chunk_waste;
	wmsum_t abdstat_linear_cnt;
	wmsum_t abdstat_linear_data_size;
	} abd_sums;

	/*
	- * The size of the chunks ABD allocates. Because the sizes allocated from the
	- * kmem_cache can't change, this tunable can only be modified at boot. Changing
	- * it at runtime would cause ABD iteration to work incorrectly for ABDs which
	- * were allocated with the old size, so a safeguard has been put in place which
	- * will cause the machine to panic if you change it and try to access the data
	- * within a scattered ABD.
	+ * zfs_abd_scatter_min_size is the minimum allocation size to use scatter
	+ * ABD's for. Smaller allocations will use linear ABD's which use
	+ * zio_[data_]buf_alloc().
	+ *
	+ * Scatter ABD's use at least one page each, so sub-page allocations waste
	+ * some space when allocated as scatter (e.g. 2KB scatter allocation wastes
	+ * half of each page). Using linear ABD's for small allocations means that
	+ * they will be put on slabs which contain many allocations.
	+ *
	+ * Linear ABDs for multi-page allocations are easier to use, and in some cases
	+ * it allows to avoid buffer copying. But allocation and especially free
	+ * of multi-page linear ABDs are expensive operations due to KVA mapping and
	+ * unmapping, and with time they cause KVA fragmentations.
	*/
	-size_t zfs_abd_chunk_size = 4096;
	+size_t zfs_abd_scatter_min_size = PAGE_SIZE + 1;

	#if defined(_KERNEL)
	SYSCTL_DECL(_vfs_zfs);

	SYSCTL_INT(_vfs_zfs, OID_AUTO, abd_scatter_enabled, CTLFLAG_RWTUN,
	&zfs_abd_scatter_enabled, 0, "Enable scattered ARC data buffers");
	-SYSCTL_ULONG(_vfs_zfs, OID_AUTO, abd_chunk_size, CTLFLAG_RDTUN,
	- &zfs_abd_chunk_size, 0, "The size of the chunks ABD allocates");
	+SYSCTL_ULONG(_vfs_zfs, OID_AUTO, abd_scatter_min_size, CTLFLAG_RWTUN,
	+ &zfs_abd_scatter_min_size, 0, "Minimum size of scatter allocations.");
	#endif

	kmem_cache_t *abd_chunk_cache;
	static kstat_t *abd_ksp;

	/*
	* We use a scattered SPA_MAXBLOCKSIZE sized ABD whose chunks are
	- * just a single zero'd sized zfs_abd_chunk_size buffer. This
	- * allows us to conserve memory by only using a single zero buffer
	- * for the scatter chunks.
	+ * just a single zero'd page-sized buffer. This allows us to conserve
	+ * memory by only using a single zero buffer for the scatter chunks.
	*/
	abd_t *abd_zero_scatter = NULL;
	static char *abd_zero_buf = NULL;

	-static void
	-abd_free_chunk(void *c)
	-{
	- kmem_cache_free(abd_chunk_cache, c);
	-}
	-
	static uint_t
	abd_chunkcnt_for_bytes(size_t size)
	{
	- return (P2ROUNDUP(size, zfs_abd_chunk_size) / zfs_abd_chunk_size);
	+ return ((size + PAGE_MASK) >> PAGE_SHIFT);
	}

	static inline uint_t
	abd_scatter_chunkcnt(abd_t *abd)
	{
	ASSERT(!abd_is_linear(abd));
	return (abd_chunkcnt_for_bytes(
	ABD_SCATTER(abd).abd_offset + abd->abd_size));
	}

	boolean_t
	abd_size_alloc_linear(size_t size)
	{
	- return (size <= zfs_abd_chunk_size ? B_TRUE : B_FALSE);
	+ return (size < zfs_abd_scatter_min_size ? B_TRUE : B_FALSE);
	}

	void
	abd_update_scatter_stats(abd_t *abd, abd_stats_op_t op)
	{
	uint_t n = abd_scatter_chunkcnt(abd);
	ASSERT(op == ABDSTAT_INCR \|\| op == ABDSTAT_DECR);
	- int waste = n * zfs_abd_chunk_size - abd->abd_size;
	+ int waste = (n << PAGE_SHIFT) - abd->abd_size;
	if (op == ABDSTAT_INCR) {
	ABDSTAT_BUMP(abdstat_scatter_cnt);
	ABDSTAT_INCR(abdstat_scatter_data_size, abd->abd_size);
	ABDSTAT_INCR(abdstat_scatter_chunk_waste, waste);
	arc_space_consume(waste, ARC_SPACE_ABD_CHUNK_WASTE);
	} else {
	ABDSTAT_BUMPDOWN(abdstat_scatter_cnt);
	ABDSTAT_INCR(abdstat_scatter_data_size, -(int)abd->abd_size);
	ABDSTAT_INCR(abdstat_scatter_chunk_waste, -waste);
	arc_space_return(waste, ARC_SPACE_ABD_CHUNK_WASTE);
	}
	}

	void
	abd_update_linear_stats(abd_t *abd, abd_stats_op_t op)
	{
	ASSERT(op == ABDSTAT_INCR \|\| op == ABDSTAT_DECR);
	if (op == ABDSTAT_INCR) {
	ABDSTAT_BUMP(abdstat_linear_cnt);
	ABDSTAT_INCR(abdstat_linear_data_size, abd->abd_size);
	} else {
	ABDSTAT_BUMPDOWN(abdstat_linear_cnt);
	ABDSTAT_INCR(abdstat_linear_data_size, -(int)abd->abd_size);
	}
	}

	void
	abd_verify_scatter(abd_t *abd)
	{
	uint_t i, n;

	/*
	- * There is no scatter linear pages in FreeBSD so there is an
	- * if an error if the ABD has been marked as a linear page.
	+ * There is no scatter linear pages in FreeBSD so there is
	+ * an error if the ABD has been marked as a linear page.
	*/
	ASSERT(!abd_is_linear_page(abd));
	- ASSERT3U(ABD_SCATTER(abd).abd_offset, <,
	- zfs_abd_chunk_size);
	+ ASSERT3U(ABD_SCATTER(abd).abd_offset, <, PAGE_SIZE);
	n = abd_scatter_chunkcnt(abd);
	for (i = 0; i < n; i++) {
	ASSERT3P(ABD_SCATTER(abd).abd_chunks[i], !=, NULL);
	}
	}

	void
	abd_alloc_chunks(abd_t *abd, size_t size)
	{
	uint_t i, n;

	n = abd_chunkcnt_for_bytes(size);
	for (i = 0; i < n; i++) {
	- void *c = kmem_cache_alloc(abd_chunk_cache, KM_PUSHPAGE);
	- ASSERT3P(c, !=, NULL);
	- ABD_SCATTER(abd).abd_chunks[i] = c;
	+ ABD_SCATTER(abd).abd_chunks[i] =
	+ kmem_cache_alloc(abd_chunk_cache, KM_PUSHPAGE);
	}
	- ABD_SCATTER(abd).abd_chunk_size = zfs_abd_chunk_size;
	}

	void
	abd_free_chunks(abd_t *abd)
	{
	uint_t i, n;

	n = abd_scatter_chunkcnt(abd);
	for (i = 0; i < n; i++) {
	- abd_free_chunk(ABD_SCATTER(abd).abd_chunks[i]);
	+ kmem_cache_free(abd_chunk_cache,
	+ ABD_SCATTER(abd).abd_chunks[i]);
	}
	}

	abd_t *
	abd_alloc_struct_impl(size_t size)
	{
	uint_t chunkcnt = abd_chunkcnt_for_bytes(size);
	/*
	* In the event we are allocating a gang ABD, the size passed in
	* will be 0. We must make sure to set abd_size to the size of an
	* ABD struct as opposed to an ABD scatter with 0 chunks. The gang
	* ABD struct allocation accounts for an additional 24 bytes over
	* a scatter ABD with 0 chunks.
	*/
	size_t abd_size = MAX(sizeof (abd_t),
	offsetof(abd_t, abd_u.abd_scatter.abd_chunks[chunkcnt]));
	abd_t *abd = kmem_alloc(abd_size, KM_PUSHPAGE);
	ASSERT3P(abd, !=, NULL);
	ABDSTAT_INCR(abdstat_struct_size, abd_size);

	return (abd);
	}

	void
	abd_free_struct_impl(abd_t *abd)
	{
	uint_t chunkcnt = abd_is_linear(abd) \|\| abd_is_gang(abd) ? 0 :
	abd_scatter_chunkcnt(abd);
	ssize_t size = MAX(sizeof (abd_t),
	offsetof(abd_t, abd_u.abd_scatter.abd_chunks[chunkcnt]));
	kmem_free(abd, size);
	ABDSTAT_INCR(abdstat_struct_size, -size);
	}

	/*
	* Allocate scatter ABD of size SPA_MAXBLOCKSIZE, where
	* each chunk in the scatterlist will be set to abd_zero_buf.
	*/
	static void
	abd_alloc_zero_scatter(void)
	{
	uint_t i, n;

	n = abd_chunkcnt_for_bytes(SPA_MAXBLOCKSIZE);
	- abd_zero_buf = kmem_zalloc(zfs_abd_chunk_size, KM_SLEEP);
	+ abd_zero_buf = kmem_cache_alloc(abd_chunk_cache, KM_PUSHPAGE);
	abd_zero_scatter = abd_alloc_struct(SPA_MAXBLOCKSIZE);

	abd_zero_scatter->abd_flags \|= ABD_FLAG_OWNER \| ABD_FLAG_ZEROS;
	abd_zero_scatter->abd_size = SPA_MAXBLOCKSIZE;

	ABD_SCATTER(abd_zero_scatter).abd_offset = 0;
	- ABD_SCATTER(abd_zero_scatter).abd_chunk_size =
	- zfs_abd_chunk_size;

	for (i = 0; i < n; i++) {
	ABD_SCATTER(abd_zero_scatter).abd_chunks[i] =
	abd_zero_buf;
	}

	ABDSTAT_BUMP(abdstat_scatter_cnt);
	- ABDSTAT_INCR(abdstat_scatter_data_size, zfs_abd_chunk_size);
	+ ABDSTAT_INCR(abdstat_scatter_data_size, PAGE_SIZE);
	}

	static void
	abd_free_zero_scatter(void)
	{
	ABDSTAT_BUMPDOWN(abdstat_scatter_cnt);
	- ABDSTAT_INCR(abdstat_scatter_data_size, -(int)zfs_abd_chunk_size);
	+ ABDSTAT_INCR(abdstat_scatter_data_size, -(int)PAGE_SIZE);

	abd_free_struct(abd_zero_scatter);
	abd_zero_scatter = NULL;
	- kmem_free(abd_zero_buf, zfs_abd_chunk_size);
	+ kmem_cache_free(abd_chunk_cache, abd_zero_buf);
	}

	static int
	abd_kstats_update(kstat_t *ksp, int rw)
	{
	abd_stats_t *as = ksp->ks_data;

	if (rw == KSTAT_WRITE)
	return (EACCES);
	as->abdstat_struct_size.value.ui64 =
	wmsum_value(&abd_sums.abdstat_struct_size);
	as->abdstat_scatter_cnt.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_cnt);
	as->abdstat_scatter_data_size.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_data_size);
	as->abdstat_scatter_chunk_waste.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_chunk_waste);
	as->abdstat_linear_cnt.value.ui64 =
	wmsum_value(&abd_sums.abdstat_linear_cnt);
	as->abdstat_linear_data_size.value.ui64 =
	wmsum_value(&abd_sums.abdstat_linear_data_size);
	return (0);
	}

	void
	abd_init(void)
	{
	- abd_chunk_cache = kmem_cache_create("abd_chunk", zfs_abd_chunk_size, 0,
	+ abd_chunk_cache = kmem_cache_create("abd_chunk", PAGE_SIZE, 0,
	NULL, NULL, NULL, NULL, 0, KMC_NODEBUG);

	wmsum_init(&abd_sums.abdstat_struct_size, 0);
	wmsum_init(&abd_sums.abdstat_scatter_cnt, 0);
	wmsum_init(&abd_sums.abdstat_scatter_data_size, 0);
	wmsum_init(&abd_sums.abdstat_scatter_chunk_waste, 0);
	wmsum_init(&abd_sums.abdstat_linear_cnt, 0);
	wmsum_init(&abd_sums.abdstat_linear_data_size, 0);

	abd_ksp = kstat_create("zfs", 0, "abdstats", "misc", KSTAT_TYPE_NAMED,
	sizeof (abd_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);
	if (abd_ksp != NULL) {
	abd_ksp->ks_data = &abd_stats;
	abd_ksp->ks_update = abd_kstats_update;
	kstat_install(abd_ksp);
	}

	abd_alloc_zero_scatter();
	}

	void
	abd_fini(void)
	{
	abd_free_zero_scatter();

	if (abd_ksp != NULL) {
	kstat_delete(abd_ksp);
	abd_ksp = NULL;
	}

	wmsum_fini(&abd_sums.abdstat_struct_size);
	wmsum_fini(&abd_sums.abdstat_scatter_cnt);
	wmsum_fini(&abd_sums.abdstat_scatter_data_size);
	wmsum_fini(&abd_sums.abdstat_scatter_chunk_waste);
	wmsum_fini(&abd_sums.abdstat_linear_cnt);
	wmsum_fini(&abd_sums.abdstat_linear_data_size);

	kmem_cache_destroy(abd_chunk_cache);
	abd_chunk_cache = NULL;
	}

	void
	abd_free_linear_page(abd_t *abd)
	{
	/*
	* FreeBSD does not have scatter linear pages
	* so there is an error.
	*/
	VERIFY(0);
	}

	/*
	* If we're going to use this ABD for doing I/O using the block layer, the
	* consumer of the ABD data doesn't care if it's scattered or not, and we don't
	* plan to store this ABD in memory for a long period of time, we should
	* allocate the ABD type that requires the least data copying to do the I/O.
	*
	* Currently this is linear ABDs, however if ldi_strategy() can ever issue I/Os
	* using a scatter/gather list we should switch to that and replace this call
	* with vanilla abd_alloc().
	*/
	abd_t *
	abd_alloc_for_io(size_t size, boolean_t is_metadata)
	{
	return (abd_alloc_linear(size, is_metadata));
	}

	abd_t *
	-abd_get_offset_scatter(abd_t abd, abd_t sabd, size_t off)
	+abd_get_offset_scatter(abd_t abd, abd_t sabd, size_t off,
	+ size_t size)
	{
	abd_verify(sabd);
	ASSERT3U(off, <=, sabd->abd_size);

	size_t new_offset = ABD_SCATTER(sabd).abd_offset + off;
	- uint_t chunkcnt = abd_scatter_chunkcnt(sabd) -
	- (new_offset / zfs_abd_chunk_size);
	+ size_t chunkcnt = abd_chunkcnt_for_bytes(
	+ (new_offset & PAGE_MASK) + size);
	+
	+ ASSERT3U(chunkcnt, <=, abd_scatter_chunkcnt(sabd));

	/*
	* If an abd struct is provided, it is only the minimum size. If we
	* need additional chunks, we need to allocate a new struct.
	*/
	if (abd != NULL &&
	offsetof(abd_t, abd_u.abd_scatter.abd_chunks[chunkcnt]) >
	sizeof (abd_t)) {
	abd = NULL;
	}

	if (abd == NULL)
	- abd = abd_alloc_struct(chunkcnt * zfs_abd_chunk_size);
	+ abd = abd_alloc_struct(chunkcnt << PAGE_SHIFT);

	/*
	* Even if this buf is filesystem metadata, we only track that
	* if we own the underlying data buffer, which is not true in
	* this case. Therefore, we don't ever use ABD_FLAG_META here.
	*/

	- ABD_SCATTER(abd).abd_offset = new_offset % zfs_abd_chunk_size;
	- ABD_SCATTER(abd).abd_chunk_size = zfs_abd_chunk_size;
	+ ABD_SCATTER(abd).abd_offset = new_offset & PAGE_MASK;

	/* Copy the scatterlist starting at the correct offset */
	(void) memcpy(&ABD_SCATTER(abd).abd_chunks,
	- &ABD_SCATTER(sabd).abd_chunks[new_offset /
	- zfs_abd_chunk_size],
	+ &ABD_SCATTER(sabd).abd_chunks[new_offset >> PAGE_SHIFT],
	chunkcnt * sizeof (void *));

	return (abd);
	}

	-static inline size_t
	-abd_iter_scatter_chunk_offset(struct abd_iter *aiter)
	-{
	- ASSERT(!abd_is_linear(aiter->iter_abd));
	- return ((ABD_SCATTER(aiter->iter_abd).abd_offset +
	- aiter->iter_pos) % zfs_abd_chunk_size);
	-}
	-
	-static inline size_t
	-abd_iter_scatter_chunk_index(struct abd_iter *aiter)
	-{
	- ASSERT(!abd_is_linear(aiter->iter_abd));
	- return ((ABD_SCATTER(aiter->iter_abd).abd_offset +
	- aiter->iter_pos) / zfs_abd_chunk_size);
	-}
	-
	/*
	* Initialize the abd_iter.
	*/
	void
	abd_iter_init(struct abd_iter aiter, abd_t abd)
	{
	ASSERT(!abd_is_gang(abd));
	abd_verify(abd);
	aiter->iter_abd = abd;
	aiter->iter_pos = 0;
	aiter->iter_mapaddr = NULL;
	aiter->iter_mapsize = 0;
	}

	/*
	* This is just a helper function to see if we have exhausted the
	* abd_iter and reached the end.
	*/
	boolean_t
	abd_iter_at_end(struct abd_iter *aiter)
	{
	return (aiter->iter_pos == aiter->iter_abd->abd_size);
	}

	/*
	* Advance the iterator by a certain amount. Cannot be called when a chunk is
	* in use. This can be safely called when the aiter has already exhausted, in
	* which case this does nothing.
	*/
	void
	abd_iter_advance(struct abd_iter *aiter, size_t amount)
	{
	ASSERT3P(aiter->iter_mapaddr, ==, NULL);
	ASSERT0(aiter->iter_mapsize);

	/* There's nothing left to advance to, so do nothing */
	if (abd_iter_at_end(aiter))
	return;

	aiter->iter_pos += amount;
	}

	/*
	* Map the current chunk into aiter. This can be safely called when the aiter
	* has already exhausted, in which case this does nothing.
	*/
	void
	abd_iter_map(struct abd_iter *aiter)
	{
	void *paddr;
	- size_t offset = 0;

	ASSERT3P(aiter->iter_mapaddr, ==, NULL);
	ASSERT0(aiter->iter_mapsize);

	- /* Panic if someone has changed zfs_abd_chunk_size */
	- IMPLY(!abd_is_linear(aiter->iter_abd), zfs_abd_chunk_size ==
	- ABD_SCATTER(aiter->iter_abd).abd_chunk_size);
	-
	/* There's nothing left to iterate over, so do nothing */
	if (abd_iter_at_end(aiter))
	return;

	- if (abd_is_linear(aiter->iter_abd)) {
	- offset = aiter->iter_pos;
	- aiter->iter_mapsize = aiter->iter_abd->abd_size - offset;
	- paddr = ABD_LINEAR_BUF(aiter->iter_abd);
	+ abd_t *abd = aiter->iter_abd;
	+ size_t offset = aiter->iter_pos;
	+ if (abd_is_linear(abd)) {
	+ aiter->iter_mapsize = abd->abd_size - offset;
	+ paddr = ABD_LINEAR_BUF(abd);
	} else {
	- size_t index = abd_iter_scatter_chunk_index(aiter);
	- offset = abd_iter_scatter_chunk_offset(aiter);
	- aiter->iter_mapsize = MIN(zfs_abd_chunk_size - offset,
	- aiter->iter_abd->abd_size - aiter->iter_pos);
	- paddr = ABD_SCATTER(aiter->iter_abd).abd_chunks[index];
	+ offset += ABD_SCATTER(abd).abd_offset;
	+ paddr = ABD_SCATTER(abd).abd_chunks[offset >> PAGE_SHIFT];
	+ offset &= PAGE_MASK;
	+ aiter->iter_mapsize = MIN(PAGE_SIZE - offset,
	+ abd->abd_size - aiter->iter_pos);
	}
	aiter->iter_mapaddr = (char *)paddr + offset;
	}

	/*
	* Unmap the current chunk from aiter. This can be safely called when the aiter
	* has already exhausted, in which case this does nothing.
	*/
	void
	abd_iter_unmap(struct abd_iter *aiter)
	{
	- /* There's nothing left to unmap, so do nothing */
	- if (abd_iter_at_end(aiter))
	- return;
	-
	- ASSERT3P(aiter->iter_mapaddr, !=, NULL);
	- ASSERT3U(aiter->iter_mapsize, >, 0);
	+ if (!abd_iter_at_end(aiter)) {
	+ ASSERT3P(aiter->iter_mapaddr, !=, NULL);
	+ ASSERT3U(aiter->iter_mapsize, >, 0);
	+ }

	aiter->iter_mapaddr = NULL;
	aiter->iter_mapsize = 0;
	}

	void
	abd_cache_reap_now(void)
	{
	kmem_cache_reap_soon(abd_chunk_cache);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c
	index 05377bb7ed98..fddb1f0e87cb 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c
	@@ -1,273 +1,271 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	#include <sys/spa.h>
	#include <sys/zio.h>
	#include <sys/spa_impl.h>
	#include <sys/counter.h>
	#include <sys/zio_compress.h>
	#include <sys/zio_checksum.h>
	#include <sys/zfs_context.h>
	#include <sys/arc.h>
	#include <sys/zfs_refcount.h>
	#include <sys/vdev.h>
	#include <sys/vdev_trim.h>
	#include <sys/vdev_impl.h>
	#include <sys/dsl_pool.h>
	#include <sys/zio_checksum.h>
	#include <sys/multilist.h>
	#include <sys/abd.h>
	#include <sys/zil.h>
	#include <sys/fm/fs/zfs.h>
	#include <sys/eventhandler.h>
	#include <sys/callb.h>
	#include <sys/kstat.h>
	#include <sys/zthr.h>
	#include <zfs_fletcher.h>
	#include <sys/arc_impl.h>
	#include <sys/sdt.h>
	#include <sys/aggsum.h>
	#include <sys/vnode.h>
	#include <cityhash.h>
	#include <machine/vmparam.h>
	#include <sys/vm.h>
	#include <sys/vmmeter.h>

	#if __FreeBSD_version >= 1300139
	static struct sx arc_vnlru_lock;
	static struct vnode *arc_vnlru_marker;
	#endif

	extern struct vfsops zfs_vfsops;

	uint_t zfs_arc_free_target = 0;

	static void
	arc_free_target_init(void *unused __unused)
	{
	zfs_arc_free_target = vm_cnt.v_free_target;
	}
	SYSINIT(arc_free_target_init, SI_SUB_KTHREAD_PAGE, SI_ORDER_ANY,
	arc_free_target_init, NULL);

	/*
	* We don't have a tunable for arc_free_target due to the dependency on
	* pagedaemon initialisation.
	*/
	static int
	sysctl_vfs_zfs_arc_free_target(SYSCTL_HANDLER_ARGS)
	{
	uint_t val;
	int err;

	val = zfs_arc_free_target;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);

	if (val < minfree)
	return (EINVAL);
	if (val > vm_cnt.v_page_count)
	return (EINVAL);

	zfs_arc_free_target = val;

	return (0);
	}
	SYSCTL_DECL(_vfs_zfs);
	/* BEGIN CSTYLED */
	SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_free_target,
	CTLTYPE_UINT \| CTLFLAG_MPSAFE \| CTLFLAG_RW, 0, sizeof (uint_t),
	sysctl_vfs_zfs_arc_free_target, "IU",
	"Desired number of free pages below which ARC triggers reclaim");
	/* END CSTYLED */

	int64_t
	arc_available_memory(void)
	{
	int64_t lowest = INT64_MAX;
	int64_t n __unused;

	/*
	* Cooperate with pagedaemon when it's time for it to scan
	* and reclaim some pages.
	*/
	n = PAGESIZE * ((int64_t)freemem - zfs_arc_free_target);
	if (n < lowest) {
	lowest = n;
	}
	#if defined(__i386) \|\| !defined(UMA_MD_SMALL_ALLOC)
	/*
	* If we're on an i386 platform, it's possible that we'll exhaust the
	* kernel heap space before we ever run out of available physical
	* memory. Most checks of the size of the heap_area compare against
	* tune.t_minarmem, which is the minimum available real memory that we
	* can have in the system. However, this is generally fixed at 25 pages
	* which is so low that it's useless. In this comparison, we seek to
	* calculate the total heap-size, and reclaim if more than 3/4ths of the
	* heap is allocated. (Or, in the calculation, if less than 1/4th is
	* free)
	*/
	n = uma_avail() - (long)(uma_limit() / 4);
	if (n < lowest) {
	lowest = n;
	}
	#endif

	DTRACE_PROBE1(arc__available_memory, int64_t, lowest);
	return (lowest);
	}

	/*
	* Return a default max arc size based on the amount of physical memory.
	*/
	uint64_t
	arc_default_max(uint64_t min, uint64_t allmem)
	{
	uint64_t size;

	if (allmem >= 1 << 30)
	size = allmem - (1 << 30);
	else
	size = min;
	return (MAX(allmem * 5 / 8, size));
	}

	/*
	* Helper function for arc_prune_async() it is responsible for safely
	* handling the execution of a registered arc_prune_func_t.
	*/
	static void
	arc_prune_task(void *arg)
	{
	int64_t nr_scan = (intptr_t)arg;

	arc_reduce_target_size(ptob(nr_scan));
	#if __FreeBSD_version >= 1300139
	sx_xlock(&arc_vnlru_lock);
	vnlru_free_vfsops(nr_scan, &zfs_vfsops, arc_vnlru_marker);
	sx_xunlock(&arc_vnlru_lock);
	#else
	vnlru_free(nr_scan, &zfs_vfsops);
	#endif
	}

	/*
	* Notify registered consumers they must drop holds on a portion of the ARC
	* buffered they reference. This provides a mechanism to ensure the ARC can
	* honor the arc_meta_limit and reclaim otherwise pinned ARC buffers. This
	* is analogous to dnlc_reduce_cache() but more generic.
	*
	* This operation is performed asynchronously so it may be safely called
	* in the context of the arc_reclaim_thread(). A reference is taken here
	* for each registered arc_prune_t and the arc_prune_task() is responsible
	* for releasing it once the registered arc_prune_func_t has completed.
	*/
	void
	arc_prune_async(int64_t adjust)
	{

	#ifndef __LP64__
	if (adjust > INTPTR_MAX)
	adjust = INTPTR_MAX;
	#endif
	taskq_dispatch(arc_prune_taskq, arc_prune_task,
	(void *)(intptr_t)adjust, TQ_SLEEP);
	ARCSTAT_BUMP(arcstat_prune);
	}

	uint64_t
	arc_all_memory(void)
	{
	return (ptob(physmem));
	}

	int
	arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg)
	{
	return (0);
	}

	uint64_t
	arc_free_memory(void)
	{
	return (ptob(freemem));
	}

	static eventhandler_tag arc_event_lowmem = NULL;

	static void
	arc_lowmem(void *arg __unused, int howto __unused)
	{
	int64_t free_memory, to_free;

	arc_no_grow = B_TRUE;
	arc_warm = B_TRUE;
	arc_growtime = gethrtime() + SEC2NSEC(arc_grow_retry);
	free_memory = arc_available_memory();
	to_free = (arc_c >> arc_shrink_shift) - MIN(free_memory, 0);
	DTRACE_PROBE2(arc__needfree, int64_t, free_memory, int64_t, to_free);
	arc_reduce_target_size(to_free);

	/*
	* It is unsafe to block here in arbitrary threads, because we can come
	* here from ARC itself and may hold ARC locks and thus risk a deadlock
	* with ARC reclaim thread.
	*/
	if (curproc == pageproc)
	- arc_wait_for_eviction(to_free);
	- else
	- arc_wait_for_eviction(0);
	+ arc_wait_for_eviction(to_free, B_FALSE);
	}

	void
	arc_lowmem_init(void)
	{
	arc_event_lowmem = EVENTHANDLER_REGISTER(vm_lowmem, arc_lowmem, NULL,
	EVENTHANDLER_PRI_FIRST);
	#if __FreeBSD_version >= 1300139
	arc_vnlru_marker = vnlru_alloc_marker();
	sx_init(&arc_vnlru_lock, "arc vnlru lock");
	#endif
	}

	void
	arc_lowmem_fini(void)
	{
	if (arc_event_lowmem != NULL)
	EVENTHANDLER_DEREGISTER(vm_lowmem, arc_event_lowmem);
	#if __FreeBSD_version >= 1300139
	if (arc_vnlru_marker != NULL) {
	vnlru_free_marker(arc_vnlru_marker);
	sx_destroy(&arc_vnlru_lock);
	}
	#endif
	}

	void
	arc_register_hotplug(void)
	{
	}

	void
	arc_unregister_hotplug(void)
	{
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/dmu_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/dmu_os.c
	index fb8f560316ea..2cf54a3cef65 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/dmu_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/dmu_os.c
	@@ -1,349 +1,352 @@
	/*
	* Copyright (c) 2020 iXsystems, Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	*/

	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/dmu.h>
	#include <sys/dmu_impl.h>
	#include <sys/dmu_tx.h>
	#include <sys/dbuf.h>
	#include <sys/dnode.h>
	#include <sys/zfs_context.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_synctask.h>
	#include <sys/dsl_prop.h>
	#include <sys/dmu_zfetch.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zap.h>
	#include <sys/zio_checksum.h>
	#include <sys/zio_compress.h>
	#include <sys/sa.h>
	#include <sys/zfeature.h>
	#include <sys/abd.h>
	#include <sys/zfs_rlock.h>
	#include <sys/racct.h>
	#include <sys/vm.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_vnops.h>

	#include <sys/ccompat.h>

	#ifndef IDX_TO_OFF
	#define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
	#endif

	#if __FreeBSD_version < 1300051
	#define VM_ALLOC_BUSY_FLAGS VM_ALLOC_NOBUSY
	#else
	#define VM_ALLOC_BUSY_FLAGS VM_ALLOC_SBUSY \| VM_ALLOC_IGN_SBUSY
	#endif


	#if __FreeBSD_version < 1300072
	#define dmu_page_lock(m) vm_page_lock(m)
	#define dmu_page_unlock(m) vm_page_unlock(m)
	#else
	#define dmu_page_lock(m)
	#define dmu_page_unlock(m)
	#endif

	static int
	dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
	uint64_t length, int read, void tag, int numbufsp, dmu_buf_t ***dbpp)
	{
	dnode_t *dn;
	int err;

	err = dnode_hold(os, object, FTAG, &dn);
	if (err)
	return (err);

	err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
	numbufsp, dbpp, DMU_READ_PREFETCH);

	dnode_rele(dn, FTAG);

	return (err);
	}

	int
	dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
	vm_page_t ma, dmu_tx_t tx)
	{
	dmu_buf_t **dbp;
	struct sf_buf *sf;
	int numbufs, i;
	int err;

	if (size == 0)
	return (0);

	err = dmu_buf_hold_array(os, object, offset, size,
	FALSE, FTAG, &numbufs, &dbp);
	if (err)
	return (err);

	for (i = 0; i < numbufs; i++) {
	int tocpy, copied, thiscpy;
	int bufoff;
	dmu_buf_t *db = dbp[i];
	caddr_t va;

	- ASSERT(size > 0);
	+ ASSERT3U(size, >, 0);
	ASSERT3U(db->db_size, >=, PAGESIZE);

	bufoff = offset - db->db_offset;
	tocpy = (int)MIN(db->db_size - bufoff, size);

	ASSERT(i == 0 \|\| i == numbufs-1 \|\| tocpy == db->db_size);

	if (tocpy == db->db_size)
	dmu_buf_will_fill(db, tx);
	else
	dmu_buf_will_dirty(db, tx);

	for (copied = 0; copied < tocpy; copied += PAGESIZE) {
	ASSERT3U(ptoa((*ma)->pindex), ==,
	db->db_offset + bufoff);
	thiscpy = MIN(PAGESIZE, tocpy - copied);
	va = zfs_map_page(*ma, &sf);
	bcopy(va, (char *)db->db_data + bufoff, thiscpy);
	zfs_unmap_page(sf);
	ma += 1;
	bufoff += PAGESIZE;
	}

	if (tocpy == db->db_size)
	dmu_buf_fill_done(db, tx);

	offset += tocpy;
	size -= tocpy;
	}
	dmu_buf_rele_array(dbp, numbufs, FTAG);
	return (err);
	}

	int
	dmu_read_pages(objset_t os, uint64_t object, vm_page_t ma, int count,
	int rbehind, int rahead, int last_size)
	{
	struct sf_buf *sf;
	vm_object_t vmobj;
	vm_page_t m;
	dmu_buf_t **dbp;
	dmu_buf_t *db;
	caddr_t va;
	int numbufs, i;
	int bufoff, pgoff, tocpy;
	int mi, di;
	int err;

	ASSERT3U(ma[0]->pindex + count - 1, ==, ma[count - 1]->pindex);
	- ASSERT(last_size <= PAGE_SIZE);
	+ ASSERT3S(last_size, <=, PAGE_SIZE);

	err = dmu_buf_hold_array(os, object, IDX_TO_OFF(ma[0]->pindex),
	IDX_TO_OFF(count - 1) + last_size, TRUE, FTAG, &numbufs, &dbp);
	if (err != 0)
	return (err);

	#ifdef ZFS_DEBUG
	IMPLY(last_size < PAGE_SIZE, *rahead == 0);
	if (dbp[0]->db_offset != 0 \|\| numbufs > 1) {
	for (i = 0; i < numbufs; i++) {
	ASSERT(ISP2(dbp[i]->db_size));
	- ASSERT((dbp[i]->db_offset % dbp[i]->db_size) == 0);
	+ ASSERT3U((dbp[i]->db_offset % dbp[i]->db_size), ==, 0);
	ASSERT3U(dbp[i]->db_size, ==, dbp[0]->db_size);
	}
	}
	#endif

	vmobj = ma[0]->object;
	zfs_vmobject_wlock_12(vmobj);

	db = dbp[0];
	for (i = 0; i < *rbehind; i++) {
	m = vm_page_grab_unlocked(vmobj, ma[0]->pindex - 1 - i,
	VM_ALLOC_NORMAL \| VM_ALLOC_NOWAIT \| VM_ALLOC_BUSY_FLAGS);
	if (m == NULL)
	break;
	if (!vm_page_none_valid(m)) {
	ASSERT3U(m->valid, ==, VM_PAGE_BITS_ALL);
	vm_page_do_sunbusy(m);
	break;
	}
	- ASSERT(m->dirty == 0);
	+ ASSERT3U(m->dirty, ==, 0);
	ASSERT(!pmap_page_is_write_mapped(m));

	- ASSERT(db->db_size > PAGE_SIZE);
	+ ASSERT3U(db->db_size, >, PAGE_SIZE);
	bufoff = IDX_TO_OFF(m->pindex) % db->db_size;
	va = zfs_map_page(m, &sf);
	bcopy((char *)db->db_data + bufoff, va, PAGESIZE);
	zfs_unmap_page(sf);
	vm_page_valid(m);
	dmu_page_lock(m);
	if ((m->busy_lock & VPB_BIT_WAITERS) != 0)
	vm_page_activate(m);
	else
	vm_page_deactivate(m);
	dmu_page_unlock(m);
	vm_page_do_sunbusy(m);
	}
	*rbehind = i;

	bufoff = IDX_TO_OFF(ma[0]->pindex) % db->db_size;
	pgoff = 0;
	for (mi = 0, di = 0; mi < count && di < numbufs; ) {
	if (pgoff == 0) {
	m = ma[mi];
	if (m != bogus_page) {
	vm_page_assert_xbusied(m);
	ASSERT(vm_page_none_valid(m));
	- ASSERT(m->dirty == 0);
	+ ASSERT3U(m->dirty, ==, 0);
	ASSERT(!pmap_page_is_write_mapped(m));
	va = zfs_map_page(m, &sf);
	}
	}
	if (bufoff == 0)
	db = dbp[di];

	if (m != bogus_page) {
	ASSERT3U(IDX_TO_OFF(m->pindex) + pgoff, ==,
	db->db_offset + bufoff);
	}

	/*
	* We do not need to clamp the copy size by the file
	* size as the last block is zero-filled beyond the
	* end of file anyway.
	*/
	tocpy = MIN(db->db_size - bufoff, PAGESIZE - pgoff);
	+ ASSERT3S(tocpy, >=, 0);
	if (m != bogus_page)
	bcopy((char *)db->db_data + bufoff, va + pgoff, tocpy);

	pgoff += tocpy;
	- ASSERT(pgoff <= PAGESIZE);
	+ ASSERT3S(pgoff, >=, 0);
	+ ASSERT3S(pgoff, <=, PAGESIZE);
	if (pgoff == PAGESIZE) {
	if (m != bogus_page) {
	zfs_unmap_page(sf);
	vm_page_valid(m);
	}
	- ASSERT(mi < count);
	+ ASSERT3S(mi, <, count);
	mi++;
	pgoff = 0;
	}

	bufoff += tocpy;
	- ASSERT(bufoff <= db->db_size);
	+ ASSERT3S(bufoff, >=, 0);
	+ ASSERT3S(bufoff, <=, db->db_size);
	if (bufoff == db->db_size) {
	- ASSERT(di < numbufs);
	+ ASSERT3S(di, <, numbufs);
	di++;
	bufoff = 0;
	}
	}

	#ifdef ZFS_DEBUG
	/*
	* Three possibilities:
	* - last requested page ends at a buffer boundary and , thus,
	* all pages and buffers have been iterated;
	* - all requested pages are filled, but the last buffer
	* has not been exhausted;
	* the read-ahead is possible only in this case;
	* - all buffers have been read, but the last page has not been
	* fully filled;
	* this is only possible if the file has only a single buffer
	* with a size that is not a multiple of the page size.
	*/
	if (mi == count) {
	- ASSERT(di >= numbufs - 1);
	+ ASSERT3S(di, >=, numbufs - 1);
	IMPLY(*rahead != 0, di == numbufs - 1);
	IMPLY(*rahead != 0, bufoff != 0);
	- ASSERT(pgoff == 0);
	+ ASSERT0(pgoff);
	}
	if (di == numbufs) {
	- ASSERT(mi >= count - 1);
	- ASSERT(*rahead == 0);
	+ ASSERT3S(mi, >=, count - 1);
	+ ASSERT0(*rahead);
	IMPLY(pgoff == 0, mi == count);
	if (pgoff != 0) {
	- ASSERT(mi == count - 1);
	- ASSERT((dbp[0]->db_size & PAGE_MASK) != 0);
	+ ASSERT3S(mi, ==, count - 1);
	+ ASSERT3U((dbp[0]->db_size & PAGE_MASK), !=, 0);
	}
	}
	#endif
	if (pgoff != 0) {
	- ASSERT(m != bogus_page);
	+ ASSERT3P(m, !=, bogus_page);
	bzero(va + pgoff, PAGESIZE - pgoff);
	zfs_unmap_page(sf);
	vm_page_valid(m);
	}

	for (i = 0; i < *rahead; i++) {
	m = vm_page_grab_unlocked(vmobj, ma[count - 1]->pindex + 1 + i,
	VM_ALLOC_NORMAL \| VM_ALLOC_NOWAIT \| VM_ALLOC_BUSY_FLAGS);
	if (m == NULL)
	break;
	if (!vm_page_none_valid(m)) {
	ASSERT3U(m->valid, ==, VM_PAGE_BITS_ALL);
	vm_page_do_sunbusy(m);
	break;
	}
	- ASSERT(m->dirty == 0);
	+ ASSERT3U(m->dirty, ==, 0);
	ASSERT(!pmap_page_is_write_mapped(m));

	- ASSERT(db->db_size > PAGE_SIZE);
	+ ASSERT3U(db->db_size, >, PAGE_SIZE);
	bufoff = IDX_TO_OFF(m->pindex) % db->db_size;
	tocpy = MIN(db->db_size - bufoff, PAGESIZE);
	va = zfs_map_page(m, &sf);
	bcopy((char *)db->db_data + bufoff, va, tocpy);
	if (tocpy < PAGESIZE) {
	- ASSERT(i == *rahead - 1);
	- ASSERT((db->db_size & PAGE_MASK) != 0);
	+ ASSERT3S(i, ==, *rahead - 1);
	+ ASSERT3U((db->db_size & PAGE_MASK), !=, 0);
	bzero(va + tocpy, PAGESIZE - tocpy);
	}
	zfs_unmap_page(sf);
	vm_page_valid(m);
	dmu_page_lock(m);
	if ((m->busy_lock & VPB_BIT_WAITERS) != 0)
	vm_page_activate(m);
	else
	vm_page_deactivate(m);
	dmu_page_unlock(m);
	vm_page_do_sunbusy(m);
	}
	*rahead = i;
	zfs_vmobject_wunlock_12(vmobj);

	dmu_buf_rele_array(dbp, numbufs, FTAG);
	return (0);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/spa_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/spa_os.c
	index 2bc78cb451e8..070e7a5b9f1b 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/spa_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/spa_os.c
	@@ -1,281 +1,272 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011 by Delphix. All rights reserved.
	* Copyright (c) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved.
	*/


	#include <sys/zfs_context.h>
	#include <sys/fm/fs/zfs.h>
	#include <sys/spa_impl.h>
	#include <sys/zio.h>
	#include <sys/zio_checksum.h>
	#include <sys/dmu.h>
	#include <sys/dmu_tx.h>
	#include <sys/zap.h>
	#include <sys/zil.h>
	#include <sys/ddt.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_os.h>
	#include <sys/vdev_removal.h>
	#include <sys/vdev_indirect_mapping.h>
	#include <sys/vdev_indirect_births.h>
	#include <sys/metaslab.h>
	#include <sys/metaslab_impl.h>
	#include <sys/uberblock_impl.h>
	#include <sys/txg.h>
	#include <sys/avl.h>
	#include <sys/bpobj.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dmu_objset.h>
	#include <sys/unique.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_synctask.h>
	#include <sys/fs/zfs.h>
	#include <sys/arc.h>
	#include <sys/callb.h>
	#include <sys/spa_boot.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/dsl_scan.h>
	#include <sys/dmu_send.h>
	#include <sys/dsl_destroy.h>
	#include <sys/dsl_userhold.h>
	#include <sys/zfeature.h>
	#include <sys/zvol.h>
	#include <sys/abd.h>
	#include <sys/callb.h>
	#include <sys/zone.h>

	#include "zfs_prop.h"
	#include "zfs_comutil.h"

	static nvlist_t *
	spa_generate_rootconf(const char *name)
	{
	nvlist_t configs, tops;
	nvlist_t *config;
	nvlist_t best_cfg, nvtop, *nvroot;
	uint64_t *holes;
	uint64_t best_txg;
	uint64_t nchildren;
	uint64_t pgid;
	uint64_t count;
	uint64_t i;
	uint_t nholes;

	if (vdev_geom_read_pool_label(name, &configs, &count) != 0)
	return (NULL);

	ASSERT3U(count, !=, 0);
	best_txg = 0;
	for (i = 0; i < count; i++) {
	uint64_t txg;

	- VERIFY(nvlist_lookup_uint64(configs[i], ZPOOL_CONFIG_POOL_TXG,
	- &txg) == 0);
	+ txg = fnvlist_lookup_uint64(configs[i], ZPOOL_CONFIG_POOL_TXG);
	if (txg > best_txg) {
	best_txg = txg;
	best_cfg = configs[i];
	}
	}

	nchildren = 1;
	nvlist_lookup_uint64(best_cfg, ZPOOL_CONFIG_VDEV_CHILDREN, &nchildren);
	holes = NULL;
	nvlist_lookup_uint64_array(best_cfg, ZPOOL_CONFIG_HOLE_ARRAY,
	&holes, &nholes);

	tops = kmem_zalloc(nchildren * sizeof (void *), KM_SLEEP);
	for (i = 0; i < nchildren; i++) {
	if (i >= count)
	break;
	if (configs[i] == NULL)
	continue;
	- VERIFY(nvlist_lookup_nvlist(configs[i], ZPOOL_CONFIG_VDEV_TREE,
	- &nvtop) == 0);
	- nvlist_dup(nvtop, &tops[i], KM_SLEEP);
	+ nvtop = fnvlist_lookup_nvlist(configs[i],
	+ ZPOOL_CONFIG_VDEV_TREE);
	+ tops[i] = fnvlist_dup(nvtop);
	}
	for (i = 0; holes != NULL && i < nholes; i++) {
	if (i >= nchildren)
	continue;
	if (tops[holes[i]] != NULL)
	continue;
	- nvlist_alloc(&tops[holes[i]], NV_UNIQUE_NAME, KM_SLEEP);
	- VERIFY(nvlist_add_string(tops[holes[i]], ZPOOL_CONFIG_TYPE,
	- VDEV_TYPE_HOLE) == 0);
	- VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_ID,
	- holes[i]) == 0);
	- VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_GUID,
	- 0) == 0);
	+ tops[holes[i]] = fnvlist_alloc();
	+ fnvlist_add_string(tops[holes[i]], ZPOOL_CONFIG_TYPE,
	+ VDEV_TYPE_HOLE);
	+ fnvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_ID, holes[i]);
	+ fnvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_GUID, 0);
	}
	for (i = 0; i < nchildren; i++) {
	if (tops[i] != NULL)
	continue;
	- nvlist_alloc(&tops[i], NV_UNIQUE_NAME, KM_SLEEP);
	- VERIFY(nvlist_add_string(tops[i], ZPOOL_CONFIG_TYPE,
	- VDEV_TYPE_MISSING) == 0);
	- VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_ID,
	- i) == 0);
	- VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_GUID,
	- 0) == 0);
	+ tops[i] = fnvlist_alloc();
	+ fnvlist_add_string(tops[i], ZPOOL_CONFIG_TYPE,
	+ VDEV_TYPE_MISSING);
	+ fnvlist_add_uint64(tops[i], ZPOOL_CONFIG_ID, i);
	+ fnvlist_add_uint64(tops[i], ZPOOL_CONFIG_GUID, 0);
	}

	/*
	* Create pool config based on the best vdev config.
	*/
	- nvlist_dup(best_cfg, &config, KM_SLEEP);
	+ config = fnvlist_dup(best_cfg);

	/*
	* Put this pool's top-level vdevs into a root vdev.
	*/
	- VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	- &pgid) == 0);
	- VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0);
	- VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE,
	- VDEV_TYPE_ROOT) == 0);
	- VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0);
	- VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0);
	- VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	- tops, nchildren) == 0);
	+ pgid = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID);
	+ nvroot = fnvlist_alloc();
	+ fnvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, VDEV_TYPE_ROOT);
	+ fnvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL);
	+ fnvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid);
	+ fnvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, tops,
	+ nchildren);

	/*
	* Replace the existing vdev_tree with the new root vdev in
	* this pool's configuration (remove the old, add the new).
	*/
	- VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0);
	+ fnvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot);

	/*
	* Drop vdev config elements that should not be present at pool level.
	*/
	- nvlist_remove(config, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64);
	- nvlist_remove(config, ZPOOL_CONFIG_TOP_GUID, DATA_TYPE_UINT64);
	+ fnvlist_remove(config, ZPOOL_CONFIG_GUID);
	+ fnvlist_remove(config, ZPOOL_CONFIG_TOP_GUID);

	for (i = 0; i < count; i++)
	- nvlist_free(configs[i]);
	+ fnvlist_free(configs[i]);
	kmem_free(configs, count * sizeof (void *));
	for (i = 0; i < nchildren; i++)
	- nvlist_free(tops[i]);
	+ fnvlist_free(tops[i]);
	kmem_free(tops, nchildren * sizeof (void *));
	- nvlist_free(nvroot);
	+ fnvlist_free(nvroot);
	return (config);
	}

	int
	spa_import_rootpool(const char *name, bool checkpointrewind)
	{
	spa_t *spa;
	vdev_t *rvd;
	nvlist_t config, nvtop;
	uint64_t txg;
	char *pname;
	int error;

	/*
	* Read the label from the boot device and generate a configuration.
	*/
	config = spa_generate_rootconf(name);

	mutex_enter(&spa_namespace_lock);
	if (config != NULL) {
	- VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
	- &pname) == 0 && strcmp(name, pname) == 0);
	- VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg)
	- == 0);
	+ pname = fnvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME);
	+ VERIFY0(strcmp(name, pname));
	+ txg = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG);

	if ((spa = spa_lookup(pname)) != NULL) {
	/*
	* The pool could already be imported,
	* e.g., after reboot -r.
	*/
	if (spa->spa_state == POOL_STATE_ACTIVE) {
	mutex_exit(&spa_namespace_lock);
	- nvlist_free(config);
	+ fnvlist_free(config);
	return (0);
	}

	/*
	* Remove the existing root pool from the namespace so
	* that we can replace it with the correct config
	* we just read in.
	*/
	spa_remove(spa);
	}
	spa = spa_add(pname, config, NULL);

	/*
	* Set spa_ubsync.ub_version as it can be used in vdev_alloc()
	* via spa_version().
	*/
	if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
	&spa->spa_ubsync.ub_version) != 0)
	spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL;
	} else if ((spa = spa_lookup(name)) == NULL) {
	mutex_exit(&spa_namespace_lock);
	- nvlist_free(config);
	+ fnvlist_free(config);
	cmn_err(CE_NOTE, "Cannot find the pool label for '%s'",
	name);
	return (EIO);
	} else {
	- VERIFY(nvlist_dup(spa->spa_config, &config, KM_SLEEP) == 0);
	+ config = fnvlist_dup(spa->spa_config);
	}
	spa->spa_is_root = B_TRUE;
	spa->spa_import_flags = ZFS_IMPORT_VERBATIM;
	if (checkpointrewind) {
	spa->spa_import_flags \|= ZFS_IMPORT_CHECKPOINT;
	}

	/*
	* Build up a vdev tree based on the boot device's label config.
	*/
	- VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	- &nvtop) == 0);
	+ nvtop = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE);
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	error = spa_config_parse(spa, &rvd, nvtop, NULL, 0,
	VDEV_ALLOC_ROOTPOOL);
	spa_config_exit(spa, SCL_ALL, FTAG);
	if (error) {
	mutex_exit(&spa_namespace_lock);
	- nvlist_free(config);
	+ fnvlist_free(config);
	cmn_err(CE_NOTE, "Can not parse the config for pool '%s'",
	pname);
	return (error);
	}

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	vdev_free(rvd);
	spa_config_exit(spa, SCL_ALL, FTAG);
	mutex_exit(&spa_namespace_lock);

	- nvlist_free(config);
	+ fnvlist_free(config);
	return (0);
	}

	const char *
	spa_history_zone(void)
	{
	return ("freebsd");
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/sysctl_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/sysctl_os.c
	index 94124fdcf6c3..5315b60982df 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/sysctl_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/sysctl_os.c
	@@ -1,694 +1,743 @@
	/*
	* Copyright (c) 2020 iXsystems, Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	*/

	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/systm.h>
	#include <sys/conf.h>
	#include <sys/kernel.h>
	#include <sys/lock.h>
	#include <sys/malloc.h>
	#include <sys/mutex.h>
	#include <sys/proc.h>
	#include <sys/errno.h>
	#include <sys/uio.h>
	#include <sys/buf.h>
	#include <sys/file.h>
	#include <sys/kmem.h>
	#include <sys/conf.h>
	#include <sys/cmn_err.h>
	#include <sys/stat.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/zfs_znode.h>
	#include <sys/zap.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/vdev.h>
	#include <sys/vdev_impl.h>
	#include <sys/dmu.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_deleg.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_impl.h>
	#include <sys/dmu_tx.h>
	#include <sys/sunddi.h>
	#include <sys/policy.h>
	#include <sys/zone.h>
	#include <sys/nvpair.h>
	#include <sys/mount.h>
	#include <sys/taskqueue.h>
	#include <sys/sdt.h>
	#include <sys/fs/zfs.h>
	#include <sys/zfs_ctldir.h>
	#include <sys/zfs_dir.h>
	#include <sys/zfs_onexit.h>
	#include <sys/zvol.h>
	#include <sys/dsl_scan.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_send.h>
	#include <sys/dsl_destroy.h>
	#include <sys/dsl_bookmark.h>
	#include <sys/dsl_userhold.h>
	#include <sys/zfeature.h>
	#include <sys/zcp.h>
	#include <sys/zio_checksum.h>
	#include <sys/vdev_removal.h>
	#include <sys/dsl_crypt.h>

	#include <sys/zfs_ioctl_compat.h>
	#include <sys/zfs_context.h>

	#include <sys/arc_impl.h>
	#include <sys/dsl_pool.h>


	/* BEGIN CSTYLED */
	SYSCTL_DECL(_vfs_zfs);
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, arc, CTLFLAG_RW, 0, "ZFS adaptive replacement cache");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, condense, CTLFLAG_RW, 0, "ZFS condense");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, dbuf, CTLFLAG_RW, 0, "ZFS disk buf cache");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, dbuf_cache, CTLFLAG_RW, 0, "ZFS disk buf cache");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, deadman, CTLFLAG_RW, 0, "ZFS deadman");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, dedup, CTLFLAG_RW, 0, "ZFS dedup");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, l2arc, CTLFLAG_RW, 0, "ZFS l2arc");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, livelist, CTLFLAG_RW, 0, "ZFS livelist");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, lua, CTLFLAG_RW, 0, "ZFS lua");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, metaslab, CTLFLAG_RW, 0, "ZFS metaslab");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, mg, CTLFLAG_RW, 0, "ZFS metaslab group");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, multihost, CTLFLAG_RW, 0, "ZFS multihost protection");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, prefetch, CTLFLAG_RW, 0, "ZFS prefetch");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, reconstruct, CTLFLAG_RW, 0, "ZFS reconstruct");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, recv, CTLFLAG_RW, 0, "ZFS receive");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, send, CTLFLAG_RW, 0, "ZFS send");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, spa, CTLFLAG_RW, 0, "ZFS space allocation");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, trim, CTLFLAG_RW, 0, "ZFS TRIM");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, txg, CTLFLAG_RW, 0, "ZFS transaction group");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, vnops, CTLFLAG_RW, 0, "ZFS VNOPS");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, zevent, CTLFLAG_RW, 0, "ZFS event");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, zil, CTLFLAG_RW, 0, "ZFS ZIL");
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, zio, CTLFLAG_RW, 0, "ZFS ZIO");

	SYSCTL_NODE(_vfs_zfs_livelist, OID_AUTO, condense, CTLFLAG_RW, 0,
	"ZFS livelist condense");
	SYSCTL_NODE(_vfs_zfs_vdev, OID_AUTO, cache, CTLFLAG_RW, 0, "ZFS VDEV Cache");
	SYSCTL_NODE(_vfs_zfs_vdev, OID_AUTO, file, CTLFLAG_RW, 0, "ZFS VDEV file");
	SYSCTL_NODE(_vfs_zfs_vdev, OID_AUTO, mirror, CTLFLAG_RD, 0,
	"ZFS VDEV mirror");

	SYSCTL_DECL(_vfs_zfs_version);
	SYSCTL_CONST_STRING(_vfs_zfs_version, OID_AUTO, module, CTLFLAG_RD,
	(ZFS_META_VERSION "-" ZFS_META_RELEASE), "OpenZFS module version");

	extern arc_state_t ARC_anon;
	extern arc_state_t ARC_mru;
	extern arc_state_t ARC_mru_ghost;
	extern arc_state_t ARC_mfu;
	extern arc_state_t ARC_mfu_ghost;
	extern arc_state_t ARC_l2c_only;

	/*
	* minimum lifespan of a prefetch block in clock ticks
	* (initialized in arc_init())
	*/

	/* arc.c */

	+int
	+param_set_arc_max(SYSCTL_HANDLER_ARGS)
	+{
	+ uint64_t val;
	+ int err;
	+
	+ val = zfs_arc_max;
	+ err = sysctl_handle_long(oidp, &val, 0, req);
	+ if (err != 0 \|\| req->newptr == NULL)
	+ return (SET_ERROR(err));
	+
	+ if (val != 0 && (val < MIN_ARC_MAX \|\| val <= arc_c_min \|\|
	+ val >= arc_all_memory()))
	+ return (SET_ERROR(EINVAL));
	+
	+ zfs_arc_max = val;
	+ arc_tuning_update(B_TRUE);
	+
	+ /* Update the sysctl to the tuned value */
	+ if (val != 0)
	+ zfs_arc_max = arc_c_max;
	+
	+ return (0);
	+}
	+
	+int
	+param_set_arc_min(SYSCTL_HANDLER_ARGS)
	+{
	+ uint64_t val;
	+ int err;
	+
	+ val = zfs_arc_min;
	+ err = sysctl_handle_64(oidp, &val, 0, req);
	+ if (err != 0 \|\| req->newptr == NULL)
	+ return (SET_ERROR(err));
	+
	+ if (val != 0 && (val < 2ULL << SPA_MAXBLOCKSHIFT \|\| val > arc_c_max))
	+ return (SET_ERROR(EINVAL));
	+
	+ zfs_arc_min = val;
	+ arc_tuning_update(B_TRUE);
	+
	+ /* Update the sysctl to the tuned value */
	+ if (val != 0)
	+ zfs_arc_min = arc_c_min;
	+
	+ return (0);
	+}
	+
	/* legacy compat */
	extern uint64_t l2arc_write_max; /* def max write size */
	extern uint64_t l2arc_write_boost; /* extra warmup write */
	extern uint64_t l2arc_headroom; /* # of dev writes */
	extern uint64_t l2arc_headroom_boost;
	extern uint64_t l2arc_feed_secs; /* interval seconds */
	extern uint64_t l2arc_feed_min_ms; /* min interval msecs */
	extern int l2arc_noprefetch; /* don't cache prefetch bufs */
	extern int l2arc_feed_again; /* turbo warmup */
	extern int l2arc_norw; /* no reads during writes */

	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, l2arc_write_max, CTLFLAG_RW,
	&l2arc_write_max, 0, "max write size (LEGACY)");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, l2arc_write_boost, CTLFLAG_RW,
	&l2arc_write_boost, 0, "extra write during warmup (LEGACY)");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, l2arc_headroom, CTLFLAG_RW,
	&l2arc_headroom, 0, "number of dev writes (LEGACY)");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, l2arc_feed_secs, CTLFLAG_RW,
	&l2arc_feed_secs, 0, "interval seconds (LEGACY)");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, l2arc_feed_min_ms, CTLFLAG_RW,
	&l2arc_feed_min_ms, 0, "min interval milliseconds (LEGACY)");

	SYSCTL_INT(_vfs_zfs, OID_AUTO, l2arc_noprefetch, CTLFLAG_RW,
	&l2arc_noprefetch, 0, "don't cache prefetch bufs (LEGACY)");
	SYSCTL_INT(_vfs_zfs, OID_AUTO, l2arc_feed_again, CTLFLAG_RW,
	&l2arc_feed_again, 0, "turbo warmup (LEGACY)");
	SYSCTL_INT(_vfs_zfs, OID_AUTO, l2arc_norw, CTLFLAG_RW,
	&l2arc_norw, 0, "no reads during writes (LEGACY)");
	#if 0
	extern int zfs_compressed_arc_enabled;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, compressed_arc_enabled, CTLFLAG_RW,
	&zfs_compressed_arc_enabled, 1, "compressed arc buffers (LEGACY)");
	#endif

	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, anon_size, CTLFLAG_RD,
	&ARC_anon.arcs_size.rc_count, 0, "size of anonymous state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, anon_metadata_esize, CTLFLAG_RD,
	&ARC_anon.arcs_esize[ARC_BUFC_METADATA].rc_count, 0,
	"size of anonymous state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, anon_data_esize, CTLFLAG_RD,
	&ARC_anon.arcs_esize[ARC_BUFC_DATA].rc_count, 0,
	"size of anonymous state");

	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mru_size, CTLFLAG_RD,
	&ARC_mru.arcs_size.rc_count, 0, "size of mru state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mru_metadata_esize, CTLFLAG_RD,
	&ARC_mru.arcs_esize[ARC_BUFC_METADATA].rc_count, 0,
	"size of metadata in mru state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mru_data_esize, CTLFLAG_RD,
	&ARC_mru.arcs_esize[ARC_BUFC_DATA].rc_count, 0,
	"size of data in mru state");

	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mru_ghost_size, CTLFLAG_RD,
	&ARC_mru_ghost.arcs_size.rc_count, 0, "size of mru ghost state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mru_ghost_metadata_esize, CTLFLAG_RD,
	&ARC_mru_ghost.arcs_esize[ARC_BUFC_METADATA].rc_count, 0,
	"size of metadata in mru ghost state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mru_ghost_data_esize, CTLFLAG_RD,
	&ARC_mru_ghost.arcs_esize[ARC_BUFC_DATA].rc_count, 0,
	"size of data in mru ghost state");

	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mfu_size, CTLFLAG_RD,
	&ARC_mfu.arcs_size.rc_count, 0, "size of mfu state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mfu_metadata_esize, CTLFLAG_RD,
	&ARC_mfu.arcs_esize[ARC_BUFC_METADATA].rc_count, 0,
	"size of metadata in mfu state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mfu_data_esize, CTLFLAG_RD,
	&ARC_mfu.arcs_esize[ARC_BUFC_DATA].rc_count, 0,
	"size of data in mfu state");

	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mfu_ghost_size, CTLFLAG_RD,
	&ARC_mfu_ghost.arcs_size.rc_count, 0, "size of mfu ghost state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mfu_ghost_metadata_esize, CTLFLAG_RD,
	&ARC_mfu_ghost.arcs_esize[ARC_BUFC_METADATA].rc_count, 0,
	"size of metadata in mfu ghost state");
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, mfu_ghost_data_esize, CTLFLAG_RD,
	&ARC_mfu_ghost.arcs_esize[ARC_BUFC_DATA].rc_count, 0,
	"size of data in mfu ghost state");

	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, l2c_only_size, CTLFLAG_RD,
	&ARC_l2c_only.arcs_size.rc_count, 0, "size of mru state");

	static int
	sysctl_vfs_zfs_arc_no_grow_shift(SYSCTL_HANDLER_ARGS)
	{
	int err, val;

	val = arc_no_grow_shift;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);

	if (val < 0 \|\| val >= arc_shrink_shift)
	return (EINVAL);

	arc_no_grow_shift = val;
	return (0);
	}

	SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_no_grow_shift,
	CTLTYPE_INT \| CTLFLAG_RWTUN \| CTLFLAG_MPSAFE, NULL, sizeof (int),
	sysctl_vfs_zfs_arc_no_grow_shift, "I",
	"log2(fraction of ARC which must be free to allow growing)");

	int
	param_set_arc_long(SYSCTL_HANDLER_ARGS)
	{
	int err;

	err = sysctl_handle_long(oidp, arg1, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);

	arc_tuning_update(B_TRUE);

	return (0);
	}

	int
	param_set_arc_int(SYSCTL_HANDLER_ARGS)
	{
	int err;

	err = sysctl_handle_int(oidp, arg1, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);

	arc_tuning_update(B_TRUE);

	return (0);
	}

	SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_min,
	CTLTYPE_ULONG \| CTLFLAG_RWTUN \| CTLFLAG_MPSAFE,
	- &zfs_arc_min, sizeof (zfs_arc_min), param_set_arc_long, "LU",
	+ &zfs_arc_min, sizeof (zfs_arc_min), param_set_arc_min, "LU",
	"min arc size (LEGACY)");
	SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_max,
	CTLTYPE_ULONG \| CTLFLAG_RWTUN \| CTLFLAG_MPSAFE,
	- &zfs_arc_max, sizeof (zfs_arc_max), param_set_arc_long, "LU",
	+ &zfs_arc_max, sizeof (zfs_arc_max), param_set_arc_max, "LU",
	"max arc size (LEGACY)");

	/* dbuf.c */


	/* dmu.c */

	/* dmu_zfetch.c */
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, zfetch, CTLFLAG_RW, 0, "ZFS ZFETCH (LEGACY)");

	/* max bytes to prefetch per stream (default 8MB) */
	extern uint32_t zfetch_max_distance;
	SYSCTL_UINT(_vfs_zfs_zfetch, OID_AUTO, max_distance, CTLFLAG_RWTUN,
	&zfetch_max_distance, 0, "Max bytes to prefetch per stream (LEGACY)");

	/* max bytes to prefetch indirects for per stream (default 64MB) */
	extern uint32_t zfetch_max_idistance;
	SYSCTL_UINT(_vfs_zfs_zfetch, OID_AUTO, max_idistance, CTLFLAG_RWTUN,
	&zfetch_max_idistance, 0,
	"Max bytes to prefetch indirects for per stream (LEGACY)");

	/* dsl_pool.c */

	/* dnode.c */
	extern int zfs_default_bs;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, default_bs, CTLFLAG_RWTUN,
	&zfs_default_bs, 0, "Default dnode block shift");

	extern int zfs_default_ibs;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, default_ibs, CTLFLAG_RWTUN,
	&zfs_default_ibs, 0, "Default dnode indirect block shift");


	/* dsl_scan.c */

	/* metaslab.c */

	/*
	* In pools where the log space map feature is not enabled we touch
	* multiple metaslabs (and their respective space maps) with each
	* transaction group. Thus, we benefit from having a small space map
	* block size since it allows us to issue more I/O operations scattered
	* around the disk. So a sane default for the space map block size
	* is 8~16K.
	*/
	extern int zfs_metaslab_sm_blksz_no_log;
	SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, sm_blksz_no_log, CTLFLAG_RDTUN,
	&zfs_metaslab_sm_blksz_no_log, 0,
	"Block size for space map in pools with log space map disabled. "
	"Power of 2 and greater than 4096.");

	/*
	* When the log space map feature is enabled, we accumulate a lot of
	* changes per metaslab that are flushed once in a while so we benefit
	* from a bigger block size like 128K for the metaslab space maps.
	*/
	extern int zfs_metaslab_sm_blksz_with_log;
	SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, sm_blksz_with_log, CTLFLAG_RDTUN,
	&zfs_metaslab_sm_blksz_with_log, 0,
	"Block size for space map in pools with log space map enabled. "
	"Power of 2 and greater than 4096.");

	/*
	* The in-core space map representation is more compact than its on-disk form.
	* The zfs_condense_pct determines how much more compact the in-core
	* space map representation must be before we compact it on-disk.
	* Values should be greater than or equal to 100.
	*/
	extern int zfs_condense_pct;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, condense_pct, CTLFLAG_RWTUN,
	&zfs_condense_pct, 0,
	"Condense on-disk spacemap when it is more than this many percents"
	" of in-memory counterpart");

	extern int zfs_remove_max_segment;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, remove_max_segment, CTLFLAG_RWTUN,
	&zfs_remove_max_segment, 0, "Largest contiguous segment ZFS will attempt to"
	" allocate when removing a device");

	extern int zfs_removal_suspend_progress;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, removal_suspend_progress, CTLFLAG_RWTUN,
	&zfs_removal_suspend_progress, 0, "Ensures certain actions can happen while"
	" in the middle of a removal");


	/*
	* Minimum size which forces the dynamic allocator to change
	* it's allocation strategy. Once the space map cannot satisfy
	* an allocation of this size then it switches to using more
	* aggressive strategy (i.e search by size rather than offset).
	*/
	extern uint64_t metaslab_df_alloc_threshold;
	SYSCTL_QUAD(_vfs_zfs_metaslab, OID_AUTO, df_alloc_threshold, CTLFLAG_RWTUN,
	&metaslab_df_alloc_threshold, 0,
	"Minimum size which forces the dynamic allocator to change it's allocation strategy");

	/*
	* The minimum free space, in percent, which must be available
	* in a space map to continue allocations in a first-fit fashion.
	* Once the space map's free space drops below this level we dynamically
	* switch to using best-fit allocations.
	*/
	extern int metaslab_df_free_pct;
	SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, df_free_pct, CTLFLAG_RWTUN,
	&metaslab_df_free_pct, 0,
	"The minimum free space, in percent, which must be available in a "
	"space map to continue allocations in a first-fit fashion");

	/*
	* Percentage of all cpus that can be used by the metaslab taskq.
	*/
	extern int metaslab_load_pct;
	SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, load_pct, CTLFLAG_RWTUN,
	&metaslab_load_pct, 0,
	"Percentage of cpus that can be used by the metaslab taskq");

	/*
	* Max number of metaslabs per group to preload.
	*/
	extern int metaslab_preload_limit;
	SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, preload_limit, CTLFLAG_RWTUN,
	&metaslab_preload_limit, 0,
	"Max number of metaslabs per group to preload");

	/* spa.c */
	extern int zfs_ccw_retry_interval;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, ccw_retry_interval, CTLFLAG_RWTUN,
	&zfs_ccw_retry_interval, 0,
	"Configuration cache file write, retry after failure, interval (seconds)");

	extern uint64_t zfs_max_missing_tvds_cachefile;
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, max_missing_tvds_cachefile, CTLFLAG_RWTUN,
	&zfs_max_missing_tvds_cachefile, 0,
	"allow importing pools with missing top-level vdevs in cache file");

	extern uint64_t zfs_max_missing_tvds_scan;
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, max_missing_tvds_scan, CTLFLAG_RWTUN,
	&zfs_max_missing_tvds_scan, 0,
	"allow importing pools with missing top-level vdevs during scan");

	/* spa_misc.c */
	extern int zfs_flags;
	static int
	sysctl_vfs_zfs_debug_flags(SYSCTL_HANDLER_ARGS)
	{
	int err, val;

	val = zfs_flags;
	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);

	/*
	* ZFS_DEBUG_MODIFY must be enabled prior to boot so all
	* arc buffers in the system have the necessary additional
	* checksum data. However, it is safe to disable at any
	* time.
	*/
	if (!(zfs_flags & ZFS_DEBUG_MODIFY))
	val &= ~ZFS_DEBUG_MODIFY;
	zfs_flags = val;

	return (0);
	}

	SYSCTL_PROC(_vfs_zfs, OID_AUTO, debugflags,
	CTLTYPE_UINT \| CTLFLAG_MPSAFE \| CTLFLAG_RWTUN, NULL, 0,
	sysctl_vfs_zfs_debug_flags, "IU", "Debug flags for ZFS testing.");

	int
	param_set_deadman_synctime(SYSCTL_HANDLER_ARGS)
	{
	unsigned long val;
	int err;

	val = zfs_deadman_synctime_ms;
	err = sysctl_handle_long(oidp, &val, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);
	zfs_deadman_synctime_ms = val;

	spa_set_deadman_synctime(MSEC2NSEC(zfs_deadman_synctime_ms));

	return (0);
	}

	int
	param_set_deadman_ziotime(SYSCTL_HANDLER_ARGS)
	{
	unsigned long val;
	int err;

	val = zfs_deadman_ziotime_ms;
	err = sysctl_handle_long(oidp, &val, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);
	zfs_deadman_ziotime_ms = val;

	spa_set_deadman_ziotime(MSEC2NSEC(zfs_deadman_synctime_ms));

	return (0);
	}

	int
	param_set_deadman_failmode(SYSCTL_HANDLER_ARGS)
	{
	char buf[16];
	int rc;

	if (req->newptr == NULL)
	strlcpy(buf, zfs_deadman_failmode, sizeof (buf));

	rc = sysctl_handle_string(oidp, buf, sizeof (buf), req);
	if (rc \|\| req->newptr == NULL)
	return (rc);
	if (strcmp(buf, zfs_deadman_failmode) == 0)
	return (0);
	if (!strcmp(buf, "wait"))
	zfs_deadman_failmode = "wait";
	if (!strcmp(buf, "continue"))
	zfs_deadman_failmode = "continue";
	if (!strcmp(buf, "panic"))
	zfs_deadman_failmode = "panic";

	return (-param_set_deadman_failmode_common(buf));
	}


	/* spacemap.c */
	extern int space_map_ibs;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, space_map_ibs, CTLFLAG_RWTUN,
	&space_map_ibs, 0, "Space map indirect block shift");


	/* vdev.c */
	int
	param_set_min_auto_ashift(SYSCTL_HANDLER_ARGS)
	{
	uint64_t val;
	int err;

	val = zfs_vdev_min_auto_ashift;
	err = sysctl_handle_64(oidp, &val, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (SET_ERROR(err));

	if (val < ASHIFT_MIN \|\| val > zfs_vdev_max_auto_ashift)
	return (SET_ERROR(EINVAL));

	zfs_vdev_min_auto_ashift = val;

	return (0);
	}

	int
	param_set_max_auto_ashift(SYSCTL_HANDLER_ARGS)
	{
	uint64_t val;
	int err;

	val = zfs_vdev_max_auto_ashift;
	err = sysctl_handle_64(oidp, &val, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (SET_ERROR(err));

	if (val > ASHIFT_MAX \|\| val < zfs_vdev_min_auto_ashift)
	return (SET_ERROR(EINVAL));

	zfs_vdev_max_auto_ashift = val;

	return (0);
	}

	SYSCTL_PROC(_vfs_zfs, OID_AUTO, min_auto_ashift,
	CTLTYPE_U64 \| CTLFLAG_RWTUN \| CTLFLAG_MPSAFE,
	&zfs_vdev_min_auto_ashift, sizeof (zfs_vdev_min_auto_ashift),
	param_set_min_auto_ashift, "QU",
	"Min ashift used when creating new top-level vdev. (LEGACY)");
	SYSCTL_PROC(_vfs_zfs, OID_AUTO, max_auto_ashift,
	CTLTYPE_U64 \| CTLFLAG_RWTUN \| CTLFLAG_MPSAFE,
	&zfs_vdev_max_auto_ashift, sizeof (zfs_vdev_max_auto_ashift),
	param_set_max_auto_ashift, "QU",
	"Max ashift used when optimizing for logical -> physical sector size on "
	"new top-level vdevs. (LEGACY)");

	/*
	* Since the DTL space map of a vdev is not expected to have a lot of
	* entries, we default its block size to 4K.
	*/
	extern int zfs_vdev_dtl_sm_blksz;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, dtl_sm_blksz, CTLFLAG_RDTUN,
	&zfs_vdev_dtl_sm_blksz, 0,
	"Block size for DTL space map. Power of 2 and greater than 4096.");

	/*
	* vdev-wide space maps that have lots of entries written to them at
	* the end of each transaction can benefit from a higher I/O bandwidth
	* (e.g. vdev_obsolete_sm), thus we default their block size to 128K.
	*/
	extern int zfs_vdev_standard_sm_blksz;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, standard_sm_blksz, CTLFLAG_RDTUN,
	&zfs_vdev_standard_sm_blksz, 0,
	"Block size for standard space map. Power of 2 and greater than 4096.");

	extern int vdev_validate_skip;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, validate_skip, CTLFLAG_RDTUN,
	&vdev_validate_skip, 0,
	"Enable to bypass vdev_validate().");


	/* vdev_cache.c */

	/* vdev_mirror.c */
	/*
	* The load configuration settings below are tuned by default for
	* the case where all devices are of the same rotational type.
	*
	* If there is a mixture of rotating and non-rotating media, setting
	* non_rotating_seek_inc to 0 may well provide better results as it
	* will direct more reads to the non-rotating vdevs which are more
	* likely to have a higher performance.
	*/


	/* vdev_queue.c */
	#define ZFS_VDEV_QUEUE_KNOB_MIN(name) \
	extern uint32_t zfs_vdev_ ## name ## _min_active; \
	SYSCTL_UINT(_vfs_zfs_vdev, OID_AUTO, name ## _min_active, CTLFLAG_RWTUN,\
	&zfs_vdev_ ## name ## _min_active, 0, \
	"Initial number of I/O requests of type " #name \
	" active for each device");

	#define ZFS_VDEV_QUEUE_KNOB_MAX(name) \
	extern uint32_t zfs_vdev_ ## name ## _max_active; \
	SYSCTL_UINT(_vfs_zfs_vdev, OID_AUTO, name ## _max_active, CTLFLAG_RWTUN, \
	&zfs_vdev_ ## name ## _max_active, 0, \
	"Maximum number of I/O requests of type " #name \
	" active for each device");


	#undef ZFS_VDEV_QUEUE_KNOB

	extern uint32_t zfs_vdev_max_active;
	SYSCTL_UINT(_vfs_zfs, OID_AUTO, top_maxinflight, CTLFLAG_RWTUN,
	&zfs_vdev_max_active, 0,
	"The maximum number of I/Os of all types active for each device. (LEGACY)");

	extern int zfs_vdev_def_queue_depth;
	SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, def_queue_depth, CTLFLAG_RWTUN,
	&zfs_vdev_def_queue_depth, 0,
	"Default queue depth for each allocator");

	/*extern uint64_t zfs_multihost_history;
	SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, multihost_history, CTLFLAG_RWTUN,
	&zfs_multihost_history, 0,
	"Historical staticists for the last N multihost updates");*/

	#ifdef notyet
	SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, trim_on_init, CTLFLAG_RW,
	&vdev_trim_on_init, 0, "Enable/disable full vdev trim on initialisation");
	#endif


	/* zio.c */
	#if defined(__LP64__)
	int zio_use_uma = 1;
	#else
	int zio_use_uma = 0;
	#endif

	SYSCTL_INT(_vfs_zfs_zio, OID_AUTO, use_uma, CTLFLAG_RDTUN, &zio_use_uma, 0,
	"Use uma(9) for ZIO allocations");
	SYSCTL_INT(_vfs_zfs_zio, OID_AUTO, exclude_metadata, CTLFLAG_RDTUN, &zio_exclude_metadata, 0,
	"Exclude metadata buffers from dumps as well");

	int
	param_set_slop_shift(SYSCTL_HANDLER_ARGS)
	{
	int val;
	int err;

	val = (int )arg1;

	err = sysctl_handle_int(oidp, &val, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);

	if (val < 1 \|\| val > 31)
	return (EINVAL);

	(int )arg1 = val;

	return (0);
	}

	int
	param_set_multihost_interval(SYSCTL_HANDLER_ARGS)
	{
	int err;

	err = sysctl_handle_long(oidp, arg1, 0, req);
	if (err != 0 \|\| req->newptr == NULL)
	return (err);

	if (spa_mode_global != SPA_MODE_UNINIT)
	mmp_signal_all_threads();

	return (0);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_file.c b/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_file.c
	index 825bd706e0c0..fc04a7476154 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_file.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_file.c
	@@ -1,354 +1,355 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/file.h>
	#include <sys/vdev_file.h>
	#include <sys/vdev_impl.h>
	#include <sys/zio.h>
	#include <sys/fs/zfs.h>
	#include <sys/fm/fs/zfs.h>
	#include <sys/abd.h>
	#include <sys/stat.h>

	/*
	* Virtual device vector for files.
	*/

	static taskq_t *vdev_file_taskq;

	unsigned long vdev_file_logical_ashift = SPA_MINBLOCKSHIFT;
	unsigned long vdev_file_physical_ashift = SPA_MINBLOCKSHIFT;

	void
	vdev_file_init(void)
	{
	vdev_file_taskq = taskq_create("z_vdev_file", MAX(max_ncpus, 16),
	minclsyspri, max_ncpus, INT_MAX, 0);
	}

	void
	vdev_file_fini(void)
	{
	taskq_destroy(vdev_file_taskq);
	}

	static void
	vdev_file_hold(vdev_t *vd)
	{
	- ASSERT(vd->vdev_path != NULL);
	+ ASSERT3P(vd->vdev_path, !=, NULL);
	}

	static void
	vdev_file_rele(vdev_t *vd)
	{
	- ASSERT(vd->vdev_path != NULL);
	+ ASSERT3P(vd->vdev_path, !=, NULL);
	}

	static mode_t
	vdev_file_open_mode(spa_mode_t spa_mode)
	{
	mode_t mode = 0;

	if ((spa_mode & SPA_MODE_READ) && (spa_mode & SPA_MODE_WRITE)) {
	mode = O_RDWR;
	} else if (spa_mode & SPA_MODE_READ) {
	mode = O_RDONLY;
	} else if (spa_mode & SPA_MODE_WRITE) {
	mode = O_WRONLY;
	}

	return (mode \| O_LARGEFILE);
	}

	static int
	vdev_file_open(vdev_t vd, uint64_t psize, uint64_t *max_psize,
	uint64_t logical_ashift, uint64_t physical_ashift)
	{
	vdev_file_t *vf;
	zfs_file_t *fp;
	zfs_file_attr_t zfa;
	int error;

	/*
	* Rotational optimizations only make sense on block devices.
	*/
	vd->vdev_nonrot = B_TRUE;

	/*
	* Allow TRIM on file based vdevs. This may not always be supported,
	* since it depends on your kernel version and underlying filesystem
	* type but it is always safe to attempt.
	*/
	vd->vdev_has_trim = B_TRUE;

	/*
	* Disable secure TRIM on file based vdevs. There is no way to
	* request this behavior from the underlying filesystem.
	*/
	vd->vdev_has_securetrim = B_FALSE;

	/*
	* We must have a pathname, and it must be absolute.
	*/
	if (vd->vdev_path == NULL \|\| vd->vdev_path[0] != '/') {
	vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
	return (SET_ERROR(EINVAL));
	}

	/*
	* Reopen the device if it's not currently open. Otherwise,
	* just update the physical size of the device.
	*/
	if (vd->vdev_tsd != NULL) {
	ASSERT(vd->vdev_reopening);
	vf = vd->vdev_tsd;
	goto skip_open;
	}

	vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP);

	/*
	* We always open the files from the root of the global zone, even if
	* we're in a local zone. If the user has gotten to this point, the
	* administrator has already decided that the pool should be available
	* to local zone users, so the underlying devices should be as well.
	*/
	- ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/');
	+ ASSERT3P(vd->vdev_path, !=, NULL);
	+ ASSERT(vd->vdev_path[0] == '/');

	error = zfs_file_open(vd->vdev_path,
	vdev_file_open_mode(spa_mode(vd->vdev_spa)), 0, &fp);
	if (error) {
	vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
	return (error);
	}

	vf->vf_file = fp;

	#ifdef _KERNEL
	/*
	* Make sure it's a regular file.
	*/
	if (zfs_file_getattr(fp, &zfa)) {
	return (SET_ERROR(ENODEV));
	}
	if (!S_ISREG(zfa.zfa_mode)) {
	vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
	return (SET_ERROR(ENODEV));
	}
	#endif

	skip_open:

	error = zfs_file_getattr(vf->vf_file, &zfa);
	if (error) {
	vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
	return (error);
	}

	max_psize = psize = zfa.zfa_size;
	*logical_ashift = vdev_file_logical_ashift;
	*physical_ashift = vdev_file_physical_ashift;

	return (0);
	}

	static void
	vdev_file_close(vdev_t *vd)
	{
	vdev_file_t *vf = vd->vdev_tsd;

	if (vd->vdev_reopening \|\| vf == NULL)
	return;

	if (vf->vf_file != NULL) {
	zfs_file_close(vf->vf_file);
	}

	vd->vdev_delayed_close = B_FALSE;
	kmem_free(vf, sizeof (vdev_file_t));
	vd->vdev_tsd = NULL;
	}

	/*
	* Implements the interrupt side for file vdev types. This routine will be
	* called when the I/O completes allowing us to transfer the I/O to the
	* interrupt taskqs. For consistency, the code structure mimics disk vdev
	* types.
	*/
	static void
	vdev_file_io_intr(zio_t *zio)
	{
	zio_delay_interrupt(zio);
	}

	static void
	vdev_file_io_strategy(void *arg)
	{
	zio_t *zio = arg;
	vdev_t *vd = zio->io_vd;
	vdev_file_t *vf;
	void *buf;
	ssize_t resid;
	loff_t off;
	ssize_t size;
	int err;

	off = zio->io_offset;
	size = zio->io_size;
	resid = 0;

	vf = vd->vdev_tsd;

	ASSERT(zio->io_type == ZIO_TYPE_READ \|\| zio->io_type == ZIO_TYPE_WRITE);
	if (zio->io_type == ZIO_TYPE_READ) {
	buf = abd_borrow_buf(zio->io_abd, zio->io_size);
	err = zfs_file_pread(vf->vf_file, buf, size, off, &resid);
	abd_return_buf_copy(zio->io_abd, buf, size);
	} else {
	buf = abd_borrow_buf_copy(zio->io_abd, zio->io_size);
	err = zfs_file_pwrite(vf->vf_file, buf, size, off, &resid);
	abd_return_buf(zio->io_abd, buf, size);
	}
	if (resid != 0 && zio->io_error == 0)
	zio->io_error = ENOSPC;

	vdev_file_io_intr(zio);
	}

	static void
	vdev_file_io_start(zio_t *zio)
	{
	vdev_t *vd = zio->io_vd;
	vdev_file_t *vf = vd->vdev_tsd;

	if (zio->io_type == ZIO_TYPE_IOCTL) {
	/* XXPOLICY */
	if (!vdev_readable(vd)) {
	zio->io_error = SET_ERROR(ENXIO);
	zio_interrupt(zio);
	return;
	}

	switch (zio->io_cmd) {
	case DKIOCFLUSHWRITECACHE:
	zio->io_error = zfs_file_fsync(vf->vf_file,
	O_SYNC\|O_DSYNC);
	break;
	default:
	zio->io_error = SET_ERROR(ENOTSUP);
	}

	zio_execute(zio);
	return;
	} else if (zio->io_type == ZIO_TYPE_TRIM) {
	#ifdef notyet
	int mode = 0;

	ASSERT3U(zio->io_size, !=, 0);

	/* XXX FreeBSD has no fallocate routine in file ops */
	zio->io_error = zfs_file_fallocate(vf->vf_file,
	mode, zio->io_offset, zio->io_size);
	#endif
	zio->io_error = SET_ERROR(ENOTSUP);
	zio_execute(zio);
	return;
	}
	ASSERT(zio->io_type == ZIO_TYPE_READ \|\| zio->io_type == ZIO_TYPE_WRITE);
	zio->io_target_timestamp = zio_handle_io_delay(zio);

	VERIFY3U(taskq_dispatch(vdev_file_taskq, vdev_file_io_strategy, zio,
	TQ_SLEEP), !=, 0);
	}

	/* ARGSUSED */
	static void
	vdev_file_io_done(zio_t *zio)
	{
	}

	vdev_ops_t vdev_file_ops = {
	.vdev_op_init = NULL,
	.vdev_op_fini = NULL,
	.vdev_op_open = vdev_file_open,
	.vdev_op_close = vdev_file_close,
	.vdev_op_asize = vdev_default_asize,
	.vdev_op_min_asize = vdev_default_min_asize,
	.vdev_op_min_alloc = NULL,
	.vdev_op_io_start = vdev_file_io_start,
	.vdev_op_io_done = vdev_file_io_done,
	.vdev_op_state_change = NULL,
	.vdev_op_need_resilver = NULL,
	.vdev_op_hold = vdev_file_hold,
	.vdev_op_rele = vdev_file_rele,
	.vdev_op_remap = NULL,
	.vdev_op_xlate = vdev_default_xlate,
	.vdev_op_rebuild_asize = NULL,
	.vdev_op_metaslab_init = NULL,
	.vdev_op_config_generate = NULL,
	.vdev_op_nparity = NULL,
	.vdev_op_ndisks = NULL,
	.vdev_op_type = VDEV_TYPE_FILE, /* name of this vdev type */
	.vdev_op_leaf = B_TRUE /* leaf vdev */
	};

	/*
	* From userland we access disks just like files.
	*/
	#ifndef _KERNEL

	vdev_ops_t vdev_disk_ops = {
	.vdev_op_init = NULL,
	.vdev_op_fini = NULL,
	.vdev_op_open = vdev_file_open,
	.vdev_op_close = vdev_file_close,
	.vdev_op_asize = vdev_default_asize,
	.vdev_op_min_asize = vdev_default_min_asize,
	.vdev_op_min_alloc = NULL,
	.vdev_op_io_start = vdev_file_io_start,
	.vdev_op_io_done = vdev_file_io_done,
	.vdev_op_state_change = NULL,
	.vdev_op_need_resilver = NULL,
	.vdev_op_hold = vdev_file_hold,
	.vdev_op_rele = vdev_file_rele,
	.vdev_op_remap = NULL,
	.vdev_op_xlate = vdev_default_xlate,
	.vdev_op_rebuild_asize = NULL,
	.vdev_op_metaslab_init = NULL,
	.vdev_op_config_generate = NULL,
	.vdev_op_nparity = NULL,
	.vdev_op_ndisks = NULL,
	.vdev_op_type = VDEV_TYPE_DISK, /* name of this vdev type */
	.vdev_op_leaf = B_TRUE /* leaf vdev */
	};

	#endif

	ZFS_MODULE_PARAM(zfs_vdev_file, vdev_file_, logical_ashift, ULONG, ZMOD_RW,
	"Logical ashift for file-based devices");
	ZFS_MODULE_PARAM(zfs_vdev_file, vdev_file_, physical_ashift, ULONG, ZMOD_RW,
	"Physical ashift for file-based devices");
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_geom.c b/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_geom.c
	index c9e8e21982cf..4ffa21495e74 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_geom.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_geom.c
	@@ -1,1214 +1,1325 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
	* All rights reserved.
	*
	* Portions Copyright (c) 2012 Martin Matuska <mm@FreeBSD.org>
	*/

	#include <sys/zfs_context.h>
	#include <sys/param.h>
	#include <sys/kernel.h>
	#include <sys/bio.h>
	+#include <sys/buf.h>
	#include <sys/file.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_os.h>
	#include <sys/fs/zfs.h>
	#include <sys/zio.h>
	+#include <vm/vm_page.h>
	#include <geom/geom.h>
	#include <geom/geom_disk.h>
	#include <geom/geom_int.h>

	#ifndef g_topology_locked
	#define g_topology_locked() sx_xlocked(&topology_lock)
	#endif

	/*
	* Virtual device vector for GEOM.
	*/

	static g_attrchanged_t vdev_geom_attrchanged;
	struct g_class zfs_vdev_class = {
	.name = "ZFS::VDEV",
	.version = G_VERSION,
	.attrchanged = vdev_geom_attrchanged,
	};

	struct consumer_vdev_elem {
	SLIST_ENTRY(consumer_vdev_elem) elems;
	vdev_t *vd;
	};

	SLIST_HEAD(consumer_priv_t, consumer_vdev_elem);
	/* BEGIN CSTYLED */
	_Static_assert(sizeof (((struct g_consumer *)NULL)->private)
	== sizeof (struct consumer_priv_t*),
	"consumer_priv_t* can't be stored in g_consumer.private");

	DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev);

	SYSCTL_DECL(_vfs_zfs_vdev);
	/* Don't send BIO_FLUSH. */
	static int vdev_geom_bio_flush_disable;
	SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_flush_disable, CTLFLAG_RWTUN,
	&vdev_geom_bio_flush_disable, 0, "Disable BIO_FLUSH");
	/* Don't send BIO_DELETE. */
	static int vdev_geom_bio_delete_disable;
	SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_delete_disable, CTLFLAG_RWTUN,
	&vdev_geom_bio_delete_disable, 0, "Disable BIO_DELETE");
	/* END CSTYLED */

	/* Declare local functions */
	static void vdev_geom_detach(struct g_consumer *cp, boolean_t open_for_read);

	/*
	* Thread local storage used to indicate when a thread is probing geoms
	* for their guids. If NULL, this thread is not tasting geoms. If non NULL,
	* it is looking for a replacement for the vdev_t* that is its value.
	*/
	uint_t zfs_geom_probe_vdev_key;

	static void
	vdev_geom_set_physpath(vdev_t vd, struct g_consumer cp,
	boolean_t do_null_update)
	{
	boolean_t needs_update = B_FALSE;
	char *physpath;
	int error, physpath_len;

	physpath_len = MAXPATHLEN;
	physpath = g_malloc(physpath_len, M_WAITOK\|M_ZERO);
	error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath);
	if (error == 0) {
	char *old_physpath;

	/* g_topology lock ensures that vdev has not been closed */
	g_topology_assert();
	old_physpath = vd->vdev_physpath;
	vd->vdev_physpath = spa_strdup(physpath);

	if (old_physpath != NULL) {
	needs_update = (strcmp(old_physpath,
	vd->vdev_physpath) != 0);
	spa_strfree(old_physpath);
	} else
	needs_update = do_null_update;
	}
	g_free(physpath);

	/*
	* If the physical path changed, update the config.
	* Only request an update for previously unset physpaths if
	* requested by the caller.
	*/
	if (needs_update)
	spa_async_request(vd->vdev_spa, SPA_ASYNC_CONFIG_UPDATE);

	}

	static void
	vdev_geom_attrchanged(struct g_consumer cp, const char attr)
	{
	struct consumer_priv_t *priv;
	struct consumer_vdev_elem *elem;

	priv = (struct consumer_priv_t *)&cp->private;
	if (SLIST_EMPTY(priv))
	return;

	SLIST_FOREACH(elem, priv, elems) {
	vdev_t *vd = elem->vd;
	if (strcmp(attr, "GEOM::physpath") == 0) {
	vdev_geom_set_physpath(vd, cp, /* null_update */B_TRUE);
	return;
	}
	}
	}

	static void
	vdev_geom_resize(struct g_consumer *cp)
	{
	struct consumer_priv_t *priv;
	struct consumer_vdev_elem *elem;
	spa_t *spa;
	vdev_t *vd;

	priv = (struct consumer_priv_t *)&cp->private;
	if (SLIST_EMPTY(priv))
	return;

	SLIST_FOREACH(elem, priv, elems) {
	vd = elem->vd;
	if (vd->vdev_state != VDEV_STATE_HEALTHY)
	continue;
	spa = vd->vdev_spa;
	if (!spa->spa_autoexpand)
	continue;
	vdev_online(spa, vd->vdev_guid, ZFS_ONLINE_EXPAND, NULL);
	}
	}

	static void
	vdev_geom_orphan(struct g_consumer *cp)
	{
	struct consumer_priv_t *priv;
	// cppcheck-suppress uninitvar
	struct consumer_vdev_elem *elem;

	g_topology_assert();

	priv = (struct consumer_priv_t *)&cp->private;
	if (SLIST_EMPTY(priv))
	/* Vdev close in progress. Ignore the event. */
	return;

	/*
	* Orphan callbacks occur from the GEOM event thread.
	* Concurrent with this call, new I/O requests may be
	* working their way through GEOM about to find out
	* (only once executed by the g_down thread) that we've
	* been orphaned from our disk provider. These I/Os
	* must be retired before we can detach our consumer.
	* This is most easily achieved by acquiring the
	* SPA ZIO configuration lock as a writer, but doing
	* so with the GEOM topology lock held would cause
	* a lock order reversal. Instead, rely on the SPA's
	* async removal support to invoke a close on this
	* vdev once it is safe to do so.
	*/
	// cppcheck-suppress All
	SLIST_FOREACH(elem, priv, elems) {
	// cppcheck-suppress uninitvar
	vdev_t *vd = elem->vd;

	vd->vdev_remove_wanted = B_TRUE;
	spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
	}
	}

	static struct g_consumer *
	vdev_geom_attach(struct g_provider pp, vdev_t vd, boolean_t sanity)
	{
	struct g_geom *gp;
	struct g_consumer *cp;
	int error;

	g_topology_assert();

	ZFS_LOG(1, "Attaching to %s.", pp->name);

	if (sanity) {
	if (pp->sectorsize > VDEV_PAD_SIZE \|\| !ISP2(pp->sectorsize)) {
	ZFS_LOG(1, "Failing attach of %s. "
	"Incompatible sectorsize %d\n",
	pp->name, pp->sectorsize);
	return (NULL);
	} else if (pp->mediasize < SPA_MINDEVSIZE) {
	ZFS_LOG(1, "Failing attach of %s. "
	"Incompatible mediasize %ju\n",
	pp->name, pp->mediasize);
	return (NULL);
	}
	}

	/* Do we have geom already? No? Create one. */
	LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
	if (gp->flags & G_GEOM_WITHER)
	continue;
	if (strcmp(gp->name, "zfs::vdev") != 0)
	continue;
	break;
	}
	if (gp == NULL) {
	gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
	gp->orphan = vdev_geom_orphan;
	gp->attrchanged = vdev_geom_attrchanged;
	gp->resize = vdev_geom_resize;
	cp = g_new_consumer(gp);
	error = g_attach(cp, pp);
	if (error != 0) {
	ZFS_LOG(1, "%s(%d): g_attach failed: %d\n", __func__,
	__LINE__, error);
	vdev_geom_detach(cp, B_FALSE);
	return (NULL);
	}
	error = g_access(cp, 1, 0, 1);
	if (error != 0) {
	ZFS_LOG(1, "%s(%d): g_access failed: %d\n", __func__,
	__LINE__, error);
	vdev_geom_detach(cp, B_FALSE);
	return (NULL);
	}
	ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
	} else {
	/* Check if we are already connected to this provider. */
	LIST_FOREACH(cp, &gp->consumer, consumer) {
	if (cp->provider == pp) {
	ZFS_LOG(1, "Found consumer for %s.", pp->name);
	break;
	}
	}
	if (cp == NULL) {
	cp = g_new_consumer(gp);
	error = g_attach(cp, pp);
	if (error != 0) {
	ZFS_LOG(1, "%s(%d): g_attach failed: %d\n",
	__func__, __LINE__, error);
	vdev_geom_detach(cp, B_FALSE);
	return (NULL);
	}
	error = g_access(cp, 1, 0, 1);
	if (error != 0) {
	ZFS_LOG(1, "%s(%d): g_access failed: %d\n",
	__func__, __LINE__, error);
	vdev_geom_detach(cp, B_FALSE);
	return (NULL);
	}
	ZFS_LOG(1, "Created consumer for %s.", pp->name);
	} else {
	error = g_access(cp, 1, 0, 1);
	if (error != 0) {
	ZFS_LOG(1, "%s(%d): g_access failed: %d\n",
	__func__, __LINE__, error);
	return (NULL);
	}
	ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
	}
	}

	if (vd != NULL)
	vd->vdev_tsd = cp;

	cp->flags \|= G_CF_DIRECT_SEND \| G_CF_DIRECT_RECEIVE;
	return (cp);
	}

	static void
	vdev_geom_detach(struct g_consumer *cp, boolean_t open_for_read)
	{
	struct g_geom *gp;

	g_topology_assert();

	ZFS_LOG(1, "Detaching from %s.",
	cp->provider && cp->provider->name ? cp->provider->name : "NULL");

	gp = cp->geom;
	if (open_for_read)
	g_access(cp, -1, 0, -1);
	/* Destroy consumer on last close. */
	if (cp->acr == 0 && cp->ace == 0) {
	if (cp->acw > 0)
	g_access(cp, 0, -cp->acw, 0);
	if (cp->provider != NULL) {
	ZFS_LOG(1, "Destroying consumer for %s.",
	cp->provider->name ? cp->provider->name : "NULL");
	g_detach(cp);
	}
	g_destroy_consumer(cp);
	}
	/* Destroy geom if there are no consumers left. */
	if (LIST_EMPTY(&gp->consumer)) {
	ZFS_LOG(1, "Destroyed geom %s.", gp->name);
	g_wither_geom(gp, ENXIO);
	}
	}

	static void
	vdev_geom_close_locked(vdev_t *vd)
	{
	struct g_consumer *cp;
	struct consumer_priv_t *priv;
	struct consumer_vdev_elem elem, elem_temp;

	g_topology_assert();

	cp = vd->vdev_tsd;
	vd->vdev_delayed_close = B_FALSE;
	if (cp == NULL)
	return;

	ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
	KASSERT(cp->private != NULL, ("%s: cp->private is NULL", __func__));
	priv = (struct consumer_priv_t *)&cp->private;
	vd->vdev_tsd = NULL;
	SLIST_FOREACH_SAFE(elem, priv, elems, elem_temp) {
	if (elem->vd == vd) {
	SLIST_REMOVE(priv, elem, consumer_vdev_elem, elems);
	g_free(elem);
	}
	}

	vdev_geom_detach(cp, B_TRUE);
	}

	/*
	* Issue one or more bios to the vdev in parallel
	* cmds, datas, offsets, errors, and sizes are arrays of length ncmds. Each IO
	* operation is described by parallel entries from each array. There may be
	* more bios actually issued than entries in the array
	*/
	static void
	vdev_geom_io(struct g_consumer cp, int cmds, void *datas, off_t offsets,
	off_t sizes, int errors, int ncmds)
	{
	struct bio **bios;
	uint8_t *p;
	off_t off, maxio, s, end;
	int i, n_bios, j;
	size_t bios_size;

	+#if __FreeBSD_version > 1300130
	maxio = maxphys - (maxphys % cp->provider->sectorsize);
	+#else
	+ maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
	+#endif
	n_bios = 0;

	/* How many bios are required for all commands ? */
	for (i = 0; i < ncmds; i++)
	n_bios += (sizes[i] + maxio - 1) / maxio;

	/* Allocate memory for the bios */
	bios_size = n_bios * sizeof (struct bio *);
	bios = kmem_zalloc(bios_size, KM_SLEEP);

	/* Prepare and issue all of the bios */
	for (i = j = 0; i < ncmds; i++) {
	off = offsets[i];
	p = datas[i];
	s = sizes[i];
	end = off + s;
	- ASSERT((off % cp->provider->sectorsize) == 0);
	- ASSERT((s % cp->provider->sectorsize) == 0);
	+ ASSERT0(off % cp->provider->sectorsize);
	+ ASSERT0(s % cp->provider->sectorsize);

	for (; off < end; off += maxio, p += maxio, s -= maxio, j++) {
	bios[j] = g_alloc_bio();
	bios[j]->bio_cmd = cmds[i];
	bios[j]->bio_done = NULL;
	bios[j]->bio_offset = off;
	bios[j]->bio_length = MIN(s, maxio);
	bios[j]->bio_data = (caddr_t)p;
	g_io_request(bios[j], cp);
	}
	}
	- ASSERT(j == n_bios);
	+ ASSERT3S(j, ==, n_bios);

	/* Wait for all of the bios to complete, and clean them up */
	for (i = j = 0; i < ncmds; i++) {
	off = offsets[i];
	s = sizes[i];
	end = off + s;

	for (; off < end; off += maxio, s -= maxio, j++) {
	errors[i] = biowait(bios[j], "vdev_geom_io") \|\|
	errors[i];
	g_destroy_bio(bios[j]);
	}
	}
	kmem_free(bios, bios_size);
	}

	/*
	* Read the vdev config from a device. Return the number of valid labels that
	* were found. The vdev config will be returned in config if and only if at
	* least one valid label was found.
	*/
	static int
	vdev_geom_read_config(struct g_consumer cp, nvlist_t *configp)
	{
	struct g_provider *pp;
	nvlist_t *config;
	vdev_phys_t *vdev_lists[VDEV_LABELS];
	char *buf;
	size_t buflen;
	uint64_t psize, state, txg;
	off_t offsets[VDEV_LABELS];
	off_t size;
	off_t sizes[VDEV_LABELS];
	int cmds[VDEV_LABELS];
	int errors[VDEV_LABELS];
	int l, nlabels;

	g_topology_assert_not();

	pp = cp->provider;
	ZFS_LOG(1, "Reading config from %s...", pp->name);

	psize = pp->mediasize;
	psize = P2ALIGN(psize, (uint64_t)sizeof (vdev_label_t));

	size = sizeof (*vdev_lists[0]) + pp->sectorsize -
	((sizeof (*vdev_lists[0]) - 1) % pp->sectorsize) - 1;

	buflen = sizeof (vdev_lists[0]->vp_nvlist);

	/* Create all of the IO requests */
	for (l = 0; l < VDEV_LABELS; l++) {
	cmds[l] = BIO_READ;
	vdev_lists[l] = kmem_alloc(size, KM_SLEEP);
	offsets[l] = vdev_label_offset(psize, l, 0) + VDEV_SKIP_SIZE;
	sizes[l] = size;
	errors[l] = 0;
	- ASSERT(offsets[l] % pp->sectorsize == 0);
	+ ASSERT0(offsets[l] % pp->sectorsize);
	}

	/* Issue the IO requests */
	vdev_geom_io(cp, cmds, (void**)vdev_lists, offsets, sizes, errors,
	VDEV_LABELS);

	/* Parse the labels */
	config = *configp = NULL;
	nlabels = 0;
	for (l = 0; l < VDEV_LABELS; l++) {
	if (errors[l] != 0)
	continue;

	buf = vdev_lists[l]->vp_nvlist;

	if (nvlist_unpack(buf, buflen, &config, 0) != 0)
	continue;

	if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
	&state) != 0 \|\| state > POOL_STATE_L2CACHE) {
	nvlist_free(config);
	continue;
	}

	if (state != POOL_STATE_SPARE &&
	state != POOL_STATE_L2CACHE &&
	(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG,
	&txg) != 0 \|\| txg == 0)) {
	nvlist_free(config);
	continue;
	}

	if (*configp != NULL)
	nvlist_free(*configp);
	*configp = config;
	nlabels++;
	}

	/* Free the label storage */
	for (l = 0; l < VDEV_LABELS; l++)
	kmem_free(vdev_lists[l], size);

	return (nlabels);
	}

	static void
	resize_configs(nvlist_t **configs, uint64_t count, uint64_t id)
	{
	nvlist_t **new_configs;
	uint64_t i;

	if (id < *count)
	return;
	new_configs = kmem_zalloc((id + 1) * sizeof (nvlist_t *),
	KM_SLEEP);
	for (i = 0; i < *count; i++)
	new_configs[i] = (*configs)[i];
	if (*configs != NULL)
	kmem_free(configs, count * sizeof (void *));
	*configs = new_configs;
	*count = id + 1;
	}

	static void
	process_vdev_config(nvlist_t **configs, uint64_t count, nvlist_t *cfg,
	const char name, uint64_t known_pool_guid)
	{
	nvlist_t *vdev_tree;
	uint64_t pool_guid;
	uint64_t vdev_guid;
	uint64_t id, txg, known_txg;
	char *pname;

	if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &pname) != 0 \|\|
	strcmp(pname, name) != 0)
	goto ignore;

	if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0)
	goto ignore;

	if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_TOP_GUID, &vdev_guid) != 0)
	goto ignore;

	if (nvlist_lookup_nvlist(cfg, ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0)
	goto ignore;

	if (nvlist_lookup_uint64(vdev_tree, ZPOOL_CONFIG_ID, &id) != 0)
	goto ignore;

	- VERIFY(nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, &txg) == 0);
	+ txg = fnvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_TXG);

	if (*known_pool_guid != 0) {
	if (pool_guid != *known_pool_guid)
	goto ignore;
	} else
	*known_pool_guid = pool_guid;

	resize_configs(configs, count, id);

	if ((*configs)[id] != NULL) {
	- VERIFY(nvlist_lookup_uint64((*configs)[id],
	- ZPOOL_CONFIG_POOL_TXG, &known_txg) == 0);
	+ known_txg = fnvlist_lookup_uint64((*configs)[id],
	+ ZPOOL_CONFIG_POOL_TXG);
	if (txg <= known_txg)
	goto ignore;
	nvlist_free((*configs)[id]);
	}

	(*configs)[id] = cfg;
	return;

	ignore:
	nvlist_free(cfg);
	}

	int
	vdev_geom_read_pool_label(const char *name,
	nvlist_t **configs, uint64_t count)
	{
	struct g_class *mp;
	struct g_geom *gp;
	struct g_provider *pp;
	struct g_consumer *zcp;
	nvlist_t *vdev_cfg;
	uint64_t pool_guid;
	int nlabels;

	DROP_GIANT();
	g_topology_lock();

	*configs = NULL;
	*count = 0;
	pool_guid = 0;
	LIST_FOREACH(mp, &g_classes, class) {
	if (mp == &zfs_vdev_class)
	continue;
	LIST_FOREACH(gp, &mp->geom, geom) {
	if (gp->flags & G_GEOM_WITHER)
	continue;
	LIST_FOREACH(pp, &gp->provider, provider) {
	if (pp->flags & G_PF_WITHER)
	continue;
	zcp = vdev_geom_attach(pp, NULL, B_TRUE);
	if (zcp == NULL)
	continue;
	g_topology_unlock();
	nlabels = vdev_geom_read_config(zcp, &vdev_cfg);
	g_topology_lock();
	vdev_geom_detach(zcp, B_TRUE);
	if (nlabels == 0)
	continue;
	ZFS_LOG(1, "successfully read vdev config");

	process_vdev_config(configs, count,
	vdev_cfg, name, &pool_guid);
	}
	}
	}
	g_topology_unlock();
	PICKUP_GIANT();

	return (*count > 0 ? 0 : ENOENT);
	}

	enum match {
	NO_MATCH = 0, /* No matching labels found */
	TOPGUID_MATCH = 1, /* Labels match top guid, not vdev guid */
	ZERO_MATCH = 1, /* Should never be returned */
	ONE_MATCH = 2, /* 1 label matching the vdev_guid */
	TWO_MATCH = 3, /* 2 label matching the vdev_guid */
	THREE_MATCH = 4, /* 3 label matching the vdev_guid */
	FULL_MATCH = 5 /* all labels match the vdev_guid */
	};

	static enum match
	vdev_attach_ok(vdev_t vd, struct g_provider pp)
	{
	nvlist_t *config;
	uint64_t pool_guid, top_guid, vdev_guid;
	struct g_consumer *cp;
	int nlabels;

	cp = vdev_geom_attach(pp, NULL, B_TRUE);
	if (cp == NULL) {
	ZFS_LOG(1, "Unable to attach tasting instance to %s.",
	pp->name);
	return (NO_MATCH);
	}
	g_topology_unlock();
	nlabels = vdev_geom_read_config(cp, &config);
	g_topology_lock();
	vdev_geom_detach(cp, B_TRUE);
	if (nlabels == 0) {
	ZFS_LOG(1, "Unable to read config from %s.", pp->name);
	return (NO_MATCH);
	}

	pool_guid = 0;
	(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid);
	top_guid = 0;
	(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID, &top_guid);
	vdev_guid = 0;
	(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid);
	nvlist_free(config);

	/*
	* Check that the label's pool guid matches the desired guid.
	* Inactive spares and L2ARCs do not have any pool guid in the label.
	*/
	if (pool_guid != 0 && pool_guid != spa_guid(vd->vdev_spa)) {
	ZFS_LOG(1, "pool guid mismatch for provider %s: %ju != %ju.",
	pp->name,
	(uintmax_t)spa_guid(vd->vdev_spa), (uintmax_t)pool_guid);
	return (NO_MATCH);
	}

	/*
	* Check that the label's vdev guid matches the desired guid.
	* The second condition handles possible race on vdev detach, when
	* remaining vdev receives GUID of destroyed top level mirror vdev.
	*/
	if (vdev_guid == vd->vdev_guid) {
	ZFS_LOG(1, "guids match for provider %s.", pp->name);
	return (ZERO_MATCH + nlabels);
	} else if (top_guid == vd->vdev_guid && vd == vd->vdev_top) {
	ZFS_LOG(1, "top vdev guid match for provider %s.", pp->name);
	return (TOPGUID_MATCH);
	}
	ZFS_LOG(1, "vdev guid mismatch for provider %s: %ju != %ju.",
	pp->name, (uintmax_t)vd->vdev_guid, (uintmax_t)vdev_guid);
	return (NO_MATCH);
	}

	static struct g_consumer *
	vdev_geom_attach_by_guids(vdev_t *vd)
	{
	struct g_class *mp;
	struct g_geom *gp;
	struct g_provider pp, best_pp;
	struct g_consumer *cp;
	const char *vdpath;
	enum match match, best_match;

	g_topology_assert();

	vdpath = vd->vdev_path + sizeof ("/dev/") - 1;
	cp = NULL;
	best_pp = NULL;
	best_match = NO_MATCH;
	LIST_FOREACH(mp, &g_classes, class) {
	if (mp == &zfs_vdev_class)
	continue;
	LIST_FOREACH(gp, &mp->geom, geom) {
	if (gp->flags & G_GEOM_WITHER)
	continue;
	LIST_FOREACH(pp, &gp->provider, provider) {
	match = vdev_attach_ok(vd, pp);
	if (match > best_match) {
	best_match = match;
	best_pp = pp;
	} else if (match == best_match) {
	if (strcmp(pp->name, vdpath) == 0) {
	best_pp = pp;
	}
	}
	if (match == FULL_MATCH)
	goto out;
	}
	}
	}

	out:
	if (best_pp) {
	cp = vdev_geom_attach(best_pp, vd, B_TRUE);
	if (cp == NULL) {
	printf("ZFS WARNING: Unable to attach to %s.\n",
	best_pp->name);
	}
	}
	return (cp);
	}

	static struct g_consumer *
	vdev_geom_open_by_guids(vdev_t *vd)
	{
	struct g_consumer *cp;
	char *buf;
	size_t len;

	g_topology_assert();

	ZFS_LOG(1, "Searching by guids [%ju:%ju].",
	(uintmax_t)spa_guid(vd->vdev_spa), (uintmax_t)vd->vdev_guid);
	cp = vdev_geom_attach_by_guids(vd);
	if (cp != NULL) {
	len = strlen(cp->provider->name) + strlen("/dev/") + 1;
	buf = kmem_alloc(len, KM_SLEEP);

	snprintf(buf, len, "/dev/%s", cp->provider->name);
	spa_strfree(vd->vdev_path);
	vd->vdev_path = buf;

	ZFS_LOG(1, "Attach by guid [%ju:%ju] succeeded, provider %s.",
	(uintmax_t)spa_guid(vd->vdev_spa),
	(uintmax_t)vd->vdev_guid, cp->provider->name);
	} else {
	ZFS_LOG(1, "Search by guid [%ju:%ju] failed.",
	(uintmax_t)spa_guid(vd->vdev_spa),
	(uintmax_t)vd->vdev_guid);
	}

	return (cp);
	}

	static struct g_consumer *
	vdev_geom_open_by_path(vdev_t *vd, int check_guid)
	{
	struct g_provider *pp;
	struct g_consumer *cp;

	g_topology_assert();

	cp = NULL;
	pp = g_provider_by_name(vd->vdev_path + sizeof ("/dev/") - 1);
	if (pp != NULL) {
	ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
	if (!check_guid \|\| vdev_attach_ok(vd, pp) == FULL_MATCH)
	cp = vdev_geom_attach(pp, vd, B_FALSE);
	}

	return (cp);
	}

	static int
	vdev_geom_open(vdev_t vd, uint64_t psize, uint64_t *max_psize,
	uint64_t logical_ashift, uint64_t physical_ashift)
	{
	struct g_provider *pp;
	struct g_consumer *cp;
	int error, has_trim;
	uint16_t rate;

	/*
	* Set the TLS to indicate downstack that we
	* should not access zvols
	*/
	- VERIFY(tsd_set(zfs_geom_probe_vdev_key, vd) == 0);
	+ VERIFY0(tsd_set(zfs_geom_probe_vdev_key, vd));

	/*
	* We must have a pathname, and it must be absolute.
	*/
	if (vd->vdev_path == NULL \|\| strncmp(vd->vdev_path, "/dev/", 5) != 0) {
	vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
	return (EINVAL);
	}

	/*
	* Reopen the device if it's not currently open. Otherwise,
	* just update the physical size of the device.
	*/
	if ((cp = vd->vdev_tsd) != NULL) {
	ASSERT(vd->vdev_reopening);
	goto skip_open;
	}

	DROP_GIANT();
	g_topology_lock();
	error = 0;

	if (vd->vdev_spa->spa_is_splitting \|\|
	((vd->vdev_prevstate == VDEV_STATE_UNKNOWN &&
	(vd->vdev_spa->spa_load_state == SPA_LOAD_NONE \|\|
	vd->vdev_spa->spa_load_state == SPA_LOAD_CREATE)))) {
	/*
	* We are dealing with a vdev that hasn't been previously
	* opened (since boot), and we are not loading an
	* existing pool configuration. This looks like a
	* vdev add operation to a new or existing pool.
	* Assume the user really wants to do this, and find
	* GEOM provider by its name, ignoring GUID mismatches.
	*
	* XXPOLICY: It would be safer to only allow a device
	* that is unlabeled or labeled but missing
	* GUID information to be opened in this fashion,
	* unless we are doing a split, in which case we
	* should allow any guid.
	*/
	cp = vdev_geom_open_by_path(vd, 0);
	} else {
	/*
	* Try using the recorded path for this device, but only
	* accept it if its label data contains the expected GUIDs.
	*/
	cp = vdev_geom_open_by_path(vd, 1);
	if (cp == NULL) {
	/*
	* The device at vd->vdev_path doesn't have the
	* expected GUIDs. The disks might have merely
	* moved around so try all other GEOM providers
	* to find one with the right GUIDs.
	*/
	cp = vdev_geom_open_by_guids(vd);
	}
	}

	/* Clear the TLS now that tasting is done */
	- VERIFY(tsd_set(zfs_geom_probe_vdev_key, NULL) == 0);
	+ VERIFY0(tsd_set(zfs_geom_probe_vdev_key, NULL));

	if (cp == NULL) {
	ZFS_LOG(1, "Vdev %s not found.", vd->vdev_path);
	error = ENOENT;
	} else {
	struct consumer_priv_t *priv;
	struct consumer_vdev_elem *elem;
	int spamode;

	priv = (struct consumer_priv_t *)&cp->private;
	if (cp->private == NULL)
	SLIST_INIT(priv);
	elem = g_malloc(sizeof (*elem), M_WAITOK\|M_ZERO);
	elem->vd = vd;
	SLIST_INSERT_HEAD(priv, elem, elems);

	spamode = spa_mode(vd->vdev_spa);
	if (cp->provider->sectorsize > VDEV_PAD_SIZE \|\|
	!ISP2(cp->provider->sectorsize)) {
	ZFS_LOG(1, "Provider %s has unsupported sectorsize.",
	cp->provider->name);

	vdev_geom_close_locked(vd);
	error = EINVAL;
	cp = NULL;
	} else if (cp->acw == 0 && (spamode & FWRITE) != 0) {
	int i;

	for (i = 0; i < 5; i++) {
	error = g_access(cp, 0, 1, 0);
	if (error == 0)
	break;
	g_topology_unlock();
	tsleep(vd, 0, "vdev", hz / 2);
	g_topology_lock();
	}
	if (error != 0) {
	printf("ZFS WARNING: Unable to open %s for "
	"writing (error=%d).\n",
	cp->provider->name, error);
	vdev_geom_close_locked(vd);
	cp = NULL;
	}
	}
	}

	/* Fetch initial physical path information for this device. */
	if (cp != NULL) {
	vdev_geom_attrchanged(cp, "GEOM::physpath");

	/* Set other GEOM characteristics */
	vdev_geom_set_physpath(vd, cp, /* do_null_update */B_FALSE);
	}

	g_topology_unlock();
	PICKUP_GIANT();
	if (cp == NULL) {
	vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
	vdev_dbgmsg(vd, "vdev_geom_open: failed to open [error=%d]",
	error);
	return (error);
	}
	skip_open:
	pp = cp->provider;

	/*
	* Determine the actual size of the device.
	*/
	max_psize = psize = pp->mediasize;

	/*
	* Determine the device's minimum transfer size and preferred
	* transfer size.
	*/
	*logical_ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
	*physical_ashift = 0;
	if (pp->stripesize && pp->stripesize > (1 << *logical_ashift) &&
	ISP2(pp->stripesize) && pp->stripesize <= (1 << ASHIFT_MAX) &&
	pp->stripeoffset == 0)
	*physical_ashift = highbit(pp->stripesize) - 1;

	/*
	* Clear the nowritecache settings, so that on a vdev_reopen()
	* we will try again.
	*/
	vd->vdev_nowritecache = B_FALSE;

	/* Inform the ZIO pipeline that we are non-rotational. */
	error = g_getattr("GEOM::rotation_rate", cp, &rate);
	if (error == 0 && rate == DISK_RR_NON_ROTATING)
	vd->vdev_nonrot = B_TRUE;
	else
	vd->vdev_nonrot = B_FALSE;

	/* Set when device reports it supports TRIM. */
	error = g_getattr("GEOM::candelete", cp, &has_trim);
	vd->vdev_has_trim = (error == 0 && has_trim);

	/* Set when device reports it supports secure TRIM. */
	/* unavailable on FreeBSD */
	vd->vdev_has_securetrim = B_FALSE;

	return (0);
	}

	static void
	vdev_geom_close(vdev_t *vd)
	{
	struct g_consumer *cp;
	boolean_t locked;

	cp = vd->vdev_tsd;

	DROP_GIANT();
	locked = g_topology_locked();
	if (!locked)
	g_topology_lock();

	if (!vd->vdev_reopening \|\|
	(cp != NULL && ((cp->flags & G_CF_ORPHAN) != 0 \|\|
	(cp->provider != NULL && cp->provider->error != 0))))
	vdev_geom_close_locked(vd);

	if (!locked)
	g_topology_unlock();
	PICKUP_GIANT();
	}

	static void
	vdev_geom_io_intr(struct bio *bp)
	{
	vdev_t *vd;
	zio_t *zio;

	zio = bp->bio_caller1;
	vd = zio->io_vd;
	zio->io_error = bp->bio_error;
	if (zio->io_error == 0 && bp->bio_resid != 0)
	zio->io_error = SET_ERROR(EIO);

	switch (zio->io_error) {
	case ENOTSUP:
	/*
	* If we get ENOTSUP for BIO_FLUSH or BIO_DELETE we know
	* that future attempts will never succeed. In this case
	* we set a persistent flag so that we don't bother with
	* requests in the future.
	*/
	switch (bp->bio_cmd) {
	case BIO_FLUSH:
	vd->vdev_nowritecache = B_TRUE;
	break;
	case BIO_DELETE:
	break;
	}
	break;
	case ENXIO:
	if (!vd->vdev_remove_wanted) {
	/*
	* If provider's error is set we assume it is being
	* removed.
	*/
	if (bp->bio_to->error != 0) {
	vd->vdev_remove_wanted = B_TRUE;
	spa_async_request(zio->io_spa,
	SPA_ASYNC_REMOVE);
	} else if (!vd->vdev_delayed_close) {
	vd->vdev_delayed_close = B_TRUE;
	}
	}
	break;
	}

	/*
	* We have to split bio freeing into two parts, because the ABD code
	* cannot be called in this context and vdev_op_io_done is not called
	* for ZIO_TYPE_IOCTL zio-s.
	*/
	if (zio->io_type != ZIO_TYPE_READ && zio->io_type != ZIO_TYPE_WRITE) {
	g_destroy_bio(bp);
	zio->io_bio = NULL;
	}
	zio_delay_interrupt(zio);
	}

	+struct vdev_geom_check_unmapped_cb_state {
	+ int pages;
	+ uint_t end;
	+};
	+
	+/*
	+ * Callback to check the ABD segment size/alignment and count the pages.
	+ * GEOM requires data buffer to look virtually contiguous. It means only
	+ * the first page of the buffer may not start and only the last may not
	+ * end on a page boundary. All other physical pages must be full.
	+ */
	+static int
	+vdev_geom_check_unmapped_cb(void buf, size_t len, void priv)
	+{
	+ struct vdev_geom_check_unmapped_cb_state *s = priv;
	+ vm_offset_t off = (vm_offset_t)buf & PAGE_MASK;
	+
	+ if (s->pages != 0 && off != 0)
	+ return (1);
	+ if (s->end != 0)
	+ return (1);
	+ s->end = (off + len) & PAGE_MASK;
	+ s->pages += (off + len + PAGE_MASK) >> PAGE_SHIFT;
	+ return (0);
	+}
	+
	+/*
	+ * Check whether we can use unmapped I/O for this ZIO on this device to
	+ * avoid data copying between scattered and/or gang ABD buffer and linear.
	+ */
	+static int
	+vdev_geom_check_unmapped(zio_t zio, struct g_consumer cp)
	+{
	+ struct vdev_geom_check_unmapped_cb_state s;
	+
	+ /* If unmapped I/O is administratively disabled, respect that. */
	+ if (!unmapped_buf_allowed)
	+ return (0);
	+
	+ /* If the buffer is already linear, then nothing to do here. */
	+ if (abd_is_linear(zio->io_abd))
	+ return (0);
	+
	+ /*
	+ * If unmapped I/O is not supported by the GEOM provider,
	+ * then we can't do anything and have to copy the data.
	+ */
	+ if ((cp->provider->flags & G_PF_ACCEPT_UNMAPPED) == 0)
	+ return (0);
	+
	+ /* Check the buffer chunks sizes/alignments and count pages. */
	+ s.pages = s.end = 0;
	+ if (abd_iterate_func(zio->io_abd, 0, zio->io_size,
	+ vdev_geom_check_unmapped_cb, &s))
	+ return (0);
	+ return (s.pages);
	+}
	+
	+/*
	+ * Callback to translate the ABD segment into array of physical pages.
	+ */
	+static int
	+vdev_geom_fill_unmap_cb(void buf, size_t len, void priv)
	+{
	+ struct bio *bp = priv;
	+ vm_offset_t addr = (vm_offset_t)buf;
	+ vm_offset_t end = addr + len;
	+
	+ if (bp->bio_ma_n == 0)
	+ bp->bio_ma_offset = addr & PAGE_MASK;
	+ do {
	+ bp->bio_ma[bp->bio_ma_n++] =
	+ PHYS_TO_VM_PAGE(pmap_kextract(addr));
	+ addr += PAGE_SIZE;
	+ } while (addr < end);
	+ return (0);
	+}
	+
	static void
	vdev_geom_io_start(zio_t *zio)
	{
	vdev_t *vd;
	struct g_consumer *cp;
	struct bio *bp;

	vd = zio->io_vd;

	switch (zio->io_type) {
	case ZIO_TYPE_IOCTL:
	/* XXPOLICY */
	if (!vdev_readable(vd)) {
	zio->io_error = SET_ERROR(ENXIO);
	zio_interrupt(zio);
	return;
	} else {
	switch (zio->io_cmd) {
	case DKIOCFLUSHWRITECACHE:
	if (zfs_nocacheflush \|\|
	vdev_geom_bio_flush_disable)
	break;
	if (vd->vdev_nowritecache) {
	zio->io_error = SET_ERROR(ENOTSUP);
	break;
	}
	goto sendreq;
	default:
	zio->io_error = SET_ERROR(ENOTSUP);
	}
	}

	zio_execute(zio);
	return;
	case ZIO_TYPE_TRIM:
	if (!vdev_geom_bio_delete_disable) {
	goto sendreq;
	}
	zio_execute(zio);
	return;
	default:
	;
	/* PASSTHROUGH --- placate compiler */
	}
	sendreq:
	ASSERT(zio->io_type == ZIO_TYPE_READ \|\|
	zio->io_type == ZIO_TYPE_WRITE \|\|
	zio->io_type == ZIO_TYPE_TRIM \|\|
	zio->io_type == ZIO_TYPE_IOCTL);

	cp = vd->vdev_tsd;
	if (cp == NULL) {
	zio->io_error = SET_ERROR(ENXIO);
	zio_interrupt(zio);
	return;
	}
	bp = g_alloc_bio();
	bp->bio_caller1 = zio;
	switch (zio->io_type) {
	case ZIO_TYPE_READ:
	case ZIO_TYPE_WRITE:
	zio->io_target_timestamp = zio_handle_io_delay(zio);
	bp->bio_offset = zio->io_offset;
	bp->bio_length = zio->io_size;
	- if (zio->io_type == ZIO_TYPE_READ) {
	+ if (zio->io_type == ZIO_TYPE_READ)
	bp->bio_cmd = BIO_READ;
	- bp->bio_data =
	- abd_borrow_buf(zio->io_abd, zio->io_size);
	- } else {
	+ else
	bp->bio_cmd = BIO_WRITE;
	- bp->bio_data =
	- abd_borrow_buf_copy(zio->io_abd, zio->io_size);
	+
	+ /*
	+ * If possible, represent scattered and/or gang ABD buffer to
	+ * GEOM as an array of physical pages. It allows to satisfy
	+ * requirement of virtually contiguous buffer without copying.
	+ */
	+ int pgs = vdev_geom_check_unmapped(zio, cp);
	+ if (pgs > 0) {
	+ bp->bio_ma = malloc(sizeof (struct vm_page ) pgs,
	+ M_DEVBUF, M_WAITOK);
	+ bp->bio_ma_n = 0;
	+ bp->bio_ma_offset = 0;
	+ abd_iterate_func(zio->io_abd, 0, zio->io_size,
	+ vdev_geom_fill_unmap_cb, bp);
	+ bp->bio_data = unmapped_buf;
	+ bp->bio_flags \|= BIO_UNMAPPED;
	+ } else {
	+ if (zio->io_type == ZIO_TYPE_READ) {
	+ bp->bio_data = abd_borrow_buf(zio->io_abd,
	+ zio->io_size);
	+ } else {
	+ bp->bio_data = abd_borrow_buf_copy(zio->io_abd,
	+ zio->io_size);
	+ }
	}
	break;
	case ZIO_TYPE_TRIM:
	bp->bio_cmd = BIO_DELETE;
	bp->bio_data = NULL;
	bp->bio_offset = zio->io_offset;
	bp->bio_length = zio->io_size;
	break;
	case ZIO_TYPE_IOCTL:
	bp->bio_cmd = BIO_FLUSH;
	bp->bio_data = NULL;
	bp->bio_offset = cp->provider->mediasize;
	bp->bio_length = 0;
	break;
	default:
	panic("invalid zio->io_type: %d\n", zio->io_type);
	}
	bp->bio_done = vdev_geom_io_intr;
	zio->io_bio = bp;

	g_io_request(bp, cp);
	}

	static void
	vdev_geom_io_done(zio_t *zio)
	{
	struct bio *bp = zio->io_bio;

	if (zio->io_type != ZIO_TYPE_READ && zio->io_type != ZIO_TYPE_WRITE) {
	- ASSERT(bp == NULL);
	+ ASSERT3P(bp, ==, NULL);
	return;
	}

	if (bp == NULL) {
	ASSERT3S(zio->io_error, ==, ENXIO);
	return;
	}

	- if (zio->io_type == ZIO_TYPE_READ)
	- abd_return_buf_copy(zio->io_abd, bp->bio_data, zio->io_size);
	- else
	- abd_return_buf(zio->io_abd, bp->bio_data, zio->io_size);
	+ if (bp->bio_ma != NULL) {
	+ free(bp->bio_ma, M_DEVBUF);
	+ } else {
	+ if (zio->io_type == ZIO_TYPE_READ) {
	+ abd_return_buf_copy(zio->io_abd, bp->bio_data,
	+ zio->io_size);
	+ } else {
	+ abd_return_buf(zio->io_abd, bp->bio_data,
	+ zio->io_size);
	+ }
	+ }

	g_destroy_bio(bp);
	zio->io_bio = NULL;
	}

	static void
	vdev_geom_hold(vdev_t *vd)
	{
	}

	static void
	vdev_geom_rele(vdev_t *vd)
	{
	}

	vdev_ops_t vdev_disk_ops = {
	.vdev_op_init = NULL,
	.vdev_op_fini = NULL,
	.vdev_op_open = vdev_geom_open,
	.vdev_op_close = vdev_geom_close,
	.vdev_op_asize = vdev_default_asize,
	.vdev_op_min_asize = vdev_default_min_asize,
	.vdev_op_min_alloc = NULL,
	.vdev_op_io_start = vdev_geom_io_start,
	.vdev_op_io_done = vdev_geom_io_done,
	.vdev_op_state_change = NULL,
	.vdev_op_need_resilver = NULL,
	.vdev_op_hold = vdev_geom_hold,
	.vdev_op_rele = vdev_geom_rele,
	.vdev_op_remap = NULL,
	.vdev_op_xlate = vdev_default_xlate,
	.vdev_op_rebuild_asize = NULL,
	.vdev_op_metaslab_init = NULL,
	.vdev_op_config_generate = NULL,
	.vdev_op_nparity = NULL,
	.vdev_op_ndisks = NULL,
	.vdev_op_type = VDEV_TYPE_DISK, /* name of this vdev type */
	.vdev_op_leaf = B_TRUE /* leaf vdev */
	};
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_label_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_label_os.c
	index 97cb201934dc..48f58807e800 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_label_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/vdev_label_os.c
	@@ -1,74 +1,74 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/dmu.h>
	#include <sys/zap.h>
	#include <sys/vdev.h>
	#include <sys/vdev_os.h>
	#include <sys/vdev_impl.h>
	#include <sys/uberblock_impl.h>
	#include <sys/metaslab.h>
	#include <sys/metaslab_impl.h>
	#include <sys/zio.h>
	#include <sys/dsl_scan.h>
	#include <sys/abd.h>
	#include <sys/fs/zfs.h>

	int
	vdev_label_write_pad2(vdev_t vd, const char buf, size_t size)
	{
	spa_t *spa = vd->vdev_spa;
	zio_t *zio;
	abd_t *pad2;
	int flags = ZIO_FLAG_CONFIG_WRITER \| ZIO_FLAG_CANFAIL;
	int error;

	if (size > VDEV_PAD_SIZE)
	return (EINVAL);

	if (!vd->vdev_ops->vdev_op_leaf)
	return (ENODEV);
	if (vdev_is_dead(vd))
	return (ENXIO);

	- ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
	+ ASSERT3U(spa_config_held(spa, SCL_ALL, RW_WRITER), ==, SCL_ALL);

	pad2 = abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE);
	abd_zero(pad2, VDEV_PAD_SIZE);
	abd_copy_from_buf(pad2, buf, size);

	retry:
	zio = zio_root(spa, NULL, NULL, flags);
	vdev_label_write(zio, vd, 0, pad2,
	offsetof(vdev_label_t, vl_be),
	VDEV_PAD_SIZE, NULL, NULL, flags);
	error = zio_wait(zio);
	if (error != 0 && !(flags & ZIO_FLAG_TRYHARD)) {
	flags \|= ZIO_FLAG_TRYHARD;
	goto retry;
	}

	abd_free(pad2);
	return (error);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_acl.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_acl.c
	index 6921014e9b16..9b410863019e 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_acl.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_acl.c
	@@ -1,2669 +1,2672 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2013 by Delphix. All rights reserved.
	* Copyright 2017 Nexenta Systems, Inc. All rights reserved.
	*/

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/systm.h>
	#include <sys/sysmacros.h>
	#include <sys/resource.h>
	#include <sys/vfs.h>
	#include <sys/vnode.h>
	#include <sys/file.h>
	#include <sys/stat.h>
	#include <sys/kmem.h>
	#include <sys/cmn_err.h>
	#include <sys/errno.h>
	#include <sys/unistd.h>
	#include <sys/sdt.h>
	#include <sys/fs/zfs.h>
	#include <sys/policy.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_fuid.h>
	#include <sys/zfs_acl.h>
	#include <sys/zfs_dir.h>
	#include <sys/zfs_quota.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/dmu.h>
	#include <sys/dnode.h>
	#include <sys/zap.h>
	#include <sys/sa.h>
	#include <acl/acl_common.h>


	#define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE
	#define DENY ACE_ACCESS_DENIED_ACE_TYPE
	#define MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE
	#define MIN_ACE_TYPE ALLOW

	#define OWNING_GROUP (ACE_GROUP\|ACE_IDENTIFIER_GROUP)
	#define EVERYONE_ALLOW_MASK (ACE_READ_ACL\|ACE_READ_ATTRIBUTES \| \
	ACE_READ_NAMED_ATTRS\|ACE_SYNCHRONIZE)
	#define EVERYONE_DENY_MASK (ACE_WRITE_ACL\|ACE_WRITE_OWNER \| \
	ACE_WRITE_ATTRIBUTES\|ACE_WRITE_NAMED_ATTRS)
	#define OWNER_ALLOW_MASK (ACE_WRITE_ACL \| ACE_WRITE_OWNER \| \
	ACE_WRITE_ATTRIBUTES\|ACE_WRITE_NAMED_ATTRS)

	#define ZFS_CHECKED_MASKS (ACE_READ_ACL\|ACE_READ_ATTRIBUTES\|ACE_READ_DATA\| \
	ACE_READ_NAMED_ATTRS\|ACE_WRITE_DATA\|ACE_WRITE_ATTRIBUTES\| \
	ACE_WRITE_NAMED_ATTRS\|ACE_APPEND_DATA\|ACE_EXECUTE\|ACE_WRITE_OWNER\| \
	ACE_WRITE_ACL\|ACE_DELETE\|ACE_DELETE_CHILD\|ACE_SYNCHRONIZE)

	#define WRITE_MASK_DATA (ACE_WRITE_DATA\|ACE_APPEND_DATA\|ACE_WRITE_NAMED_ATTRS)
	#define WRITE_MASK_ATTRS (ACE_WRITE_ACL\|ACE_WRITE_OWNER\|ACE_WRITE_ATTRIBUTES\| \
	ACE_DELETE\|ACE_DELETE_CHILD)
	#define WRITE_MASK (WRITE_MASK_DATA\|WRITE_MASK_ATTRS)

	#define OGE_CLEAR (ACE_READ_DATA\|ACE_LIST_DIRECTORY\|ACE_WRITE_DATA\| \
	ACE_ADD_FILE\|ACE_APPEND_DATA\|ACE_ADD_SUBDIRECTORY\|ACE_EXECUTE)

	#define OKAY_MASK_BITS (ACE_READ_DATA\|ACE_LIST_DIRECTORY\|ACE_WRITE_DATA\| \
	ACE_ADD_FILE\|ACE_APPEND_DATA\|ACE_ADD_SUBDIRECTORY\|ACE_EXECUTE)

	#define ALL_INHERIT (ACE_FILE_INHERIT_ACE\|ACE_DIRECTORY_INHERIT_ACE \| \
	ACE_NO_PROPAGATE_INHERIT_ACE\|ACE_INHERIT_ONLY_ACE\|ACE_INHERITED_ACE)

	#define RESTRICTED_CLEAR (ACE_WRITE_ACL\|ACE_WRITE_OWNER)

	#define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT\|ZFS_ACL_DEFAULTED\|\
	ZFS_ACL_PROTECTED)

	#define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS\|ZFS_ACL_TRIVIAL\|ZFS_INHERIT_ACE\|\
	ZFS_ACL_OBJ_ACE)

	#define ALL_MODE_EXECS (S_IXUSR \| S_IXGRP \| S_IXOTH)

	static uint16_t
	zfs_ace_v0_get_type(void *acep)
	{
	return (((zfs_oldace_t *)acep)->z_type);
	}

	static uint16_t
	zfs_ace_v0_get_flags(void *acep)
	{
	return (((zfs_oldace_t *)acep)->z_flags);
	}

	static uint32_t
	zfs_ace_v0_get_mask(void *acep)
	{
	return (((zfs_oldace_t *)acep)->z_access_mask);
	}

	static uint64_t
	zfs_ace_v0_get_who(void *acep)
	{
	return (((zfs_oldace_t *)acep)->z_fuid);
	}

	static void
	zfs_ace_v0_set_type(void *acep, uint16_t type)
	{
	((zfs_oldace_t *)acep)->z_type = type;
	}

	static void
	zfs_ace_v0_set_flags(void *acep, uint16_t flags)
	{
	((zfs_oldace_t *)acep)->z_flags = flags;
	}

	static void
	zfs_ace_v0_set_mask(void *acep, uint32_t mask)
	{
	((zfs_oldace_t *)acep)->z_access_mask = mask;
	}

	static void
	zfs_ace_v0_set_who(void *acep, uint64_t who)
	{
	((zfs_oldace_t *)acep)->z_fuid = who;
	}

	/ARGSUSED/
	static size_t
	zfs_ace_v0_size(void *acep)
	{
	return (sizeof (zfs_oldace_t));
	}

	static size_t
	zfs_ace_v0_abstract_size(void)
	{
	return (sizeof (zfs_oldace_t));
	}

	static int
	zfs_ace_v0_mask_off(void)
	{
	return (offsetof(zfs_oldace_t, z_access_mask));
	}

	/ARGSUSED/
	static int
	zfs_ace_v0_data(void acep, void *datap)
	{
	*datap = NULL;
	return (0);
	}

	static acl_ops_t zfs_acl_v0_ops = {
	zfs_ace_v0_get_mask,
	zfs_ace_v0_set_mask,
	zfs_ace_v0_get_flags,
	zfs_ace_v0_set_flags,
	zfs_ace_v0_get_type,
	zfs_ace_v0_set_type,
	zfs_ace_v0_get_who,
	zfs_ace_v0_set_who,
	zfs_ace_v0_size,
	zfs_ace_v0_abstract_size,
	zfs_ace_v0_mask_off,
	zfs_ace_v0_data
	};

	static uint16_t
	zfs_ace_fuid_get_type(void *acep)
	{
	return (((zfs_ace_hdr_t *)acep)->z_type);
	}

	static uint16_t
	zfs_ace_fuid_get_flags(void *acep)
	{
	return (((zfs_ace_hdr_t *)acep)->z_flags);
	}

	static uint32_t
	zfs_ace_fuid_get_mask(void *acep)
	{
	return (((zfs_ace_hdr_t *)acep)->z_access_mask);
	}

	static uint64_t
	zfs_ace_fuid_get_who(void *args)
	{
	uint16_t entry_type;
	zfs_ace_t *acep = args;

	entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;

	if (entry_type == ACE_OWNER \|\| entry_type == OWNING_GROUP \|\|
	entry_type == ACE_EVERYONE)
	return (-1);
	return (((zfs_ace_t *)acep)->z_fuid);
	}

	static void
	zfs_ace_fuid_set_type(void *acep, uint16_t type)
	{
	((zfs_ace_hdr_t *)acep)->z_type = type;
	}

	static void
	zfs_ace_fuid_set_flags(void *acep, uint16_t flags)
	{
	((zfs_ace_hdr_t *)acep)->z_flags = flags;
	}

	static void
	zfs_ace_fuid_set_mask(void *acep, uint32_t mask)
	{
	((zfs_ace_hdr_t *)acep)->z_access_mask = mask;
	}

	static void
	zfs_ace_fuid_set_who(void *arg, uint64_t who)
	{
	zfs_ace_t *acep = arg;

	uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;

	if (entry_type == ACE_OWNER \|\| entry_type == OWNING_GROUP \|\|
	entry_type == ACE_EVERYONE)
	return;
	acep->z_fuid = who;
	}

	static size_t
	zfs_ace_fuid_size(void *acep)
	{
	zfs_ace_hdr_t *zacep = acep;
	uint16_t entry_type;

	switch (zacep->z_type) {
	case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
	case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
	return (sizeof (zfs_object_ace_t));
	case ALLOW:
	case DENY:
	entry_type =
	(((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS);
	if (entry_type == ACE_OWNER \|\|
	entry_type == OWNING_GROUP \|\|
	entry_type == ACE_EVERYONE)
	return (sizeof (zfs_ace_hdr_t));
	/FALLTHROUGH/
	default:
	return (sizeof (zfs_ace_t));
	}
	}

	static size_t
	zfs_ace_fuid_abstract_size(void)
	{
	return (sizeof (zfs_ace_hdr_t));
	}

	static int
	zfs_ace_fuid_mask_off(void)
	{
	return (offsetof(zfs_ace_hdr_t, z_access_mask));
	}

	static int
	zfs_ace_fuid_data(void acep, void *datap)
	{
	zfs_ace_t *zacep = acep;
	zfs_object_ace_t *zobjp;

	switch (zacep->z_hdr.z_type) {
	case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
	case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
	zobjp = acep;
	*datap = (caddr_t)zobjp + sizeof (zfs_ace_t);
	return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t));
	default:
	*datap = NULL;
	return (0);
	}
	}

	static acl_ops_t zfs_acl_fuid_ops = {
	zfs_ace_fuid_get_mask,
	zfs_ace_fuid_set_mask,
	zfs_ace_fuid_get_flags,
	zfs_ace_fuid_set_flags,
	zfs_ace_fuid_get_type,
	zfs_ace_fuid_set_type,
	zfs_ace_fuid_get_who,
	zfs_ace_fuid_set_who,
	zfs_ace_fuid_size,
	zfs_ace_fuid_abstract_size,
	zfs_ace_fuid_mask_off,
	zfs_ace_fuid_data
	};

	/*
	* The following three functions are provided for compatibility with
	* older ZPL version in order to determine if the file use to have
	* an external ACL and what version of ACL previously existed on the
	* file. Would really be nice to not need this, sigh.
	*/
	uint64_t
	zfs_external_acl(znode_t *zp)
	{
	zfs_acl_phys_t acl_phys;
	int error;

	if (zp->z_is_sa)
	return (0);

	/*
	* Need to deal with a potential
	* race where zfs_sa_upgrade could cause
	* z_isa_sa to change.
	*
	* If the lookup fails then the state of z_is_sa should have
	* changed.
	*/

	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zp->z_zfsvfs),
	&acl_phys, sizeof (acl_phys))) == 0)
	return (acl_phys.z_acl_extern_obj);
	else {
	/*
	* after upgrade the SA_ZPL_ZNODE_ACL should have been
	* removed
	*/
	- VERIFY(zp->z_is_sa && error == ENOENT);
	+ VERIFY(zp->z_is_sa);
	+ VERIFY3S(error, ==, ENOENT);
	return (0);
	}
	}

	/*
	* Determine size of ACL in bytes
	*
	* This is more complicated than it should be since we have to deal
	* with old external ACLs.
	*/
	static int
	zfs_acl_znode_info(znode_t zp, int aclsize, int *aclcount,
	zfs_acl_phys_t *aclphys)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	uint64_t acl_count;
	int size;
	int error;

	ASSERT(MUTEX_HELD(&zp->z_acl_lock));
	if (zp->z_is_sa) {
	if ((error = sa_size(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zfsvfs),
	&size)) != 0)
	return (error);
	*aclsize = size;
	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_COUNT(zfsvfs),
	&acl_count, sizeof (acl_count))) != 0)
	return (error);
	*aclcount = acl_count;
	} else {
	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
	aclphys, sizeof (*aclphys))) != 0)
	return (error);

	if (aclphys->z_acl_version == ZFS_ACL_VERSION_INITIAL) {
	*aclsize = ZFS_ACL_SIZE(aclphys->z_acl_size);
	*aclcount = aclphys->z_acl_size;
	} else {
	*aclsize = aclphys->z_acl_size;
	*aclcount = aclphys->z_acl_count;
	}
	}
	return (0);
	}

	int
	zfs_znode_acl_version(znode_t *zp)
	{
	zfs_acl_phys_t acl_phys;

	if (zp->z_is_sa)
	return (ZFS_ACL_VERSION_FUID);
	else {
	int error;

	/*
	* Need to deal with a potential
	* race where zfs_sa_upgrade could cause
	* z_isa_sa to change.
	*
	* If the lookup fails then the state of z_is_sa should have
	* changed.
	*/
	if ((error = sa_lookup(zp->z_sa_hdl,
	SA_ZPL_ZNODE_ACL(zp->z_zfsvfs),
	&acl_phys, sizeof (acl_phys))) == 0)
	return (acl_phys.z_acl_version);
	else {
	/*
	* After upgrade SA_ZPL_ZNODE_ACL should have
	* been removed.
	*/
	- VERIFY(zp->z_is_sa && error == ENOENT);
	+ VERIFY(zp->z_is_sa);
	+ VERIFY3S(error, ==, ENOENT);
	return (ZFS_ACL_VERSION_FUID);
	}
	}
	}

	static int
	zfs_acl_version(int version)
	{
	if (version < ZPL_VERSION_FUID)
	return (ZFS_ACL_VERSION_INITIAL);
	else
	return (ZFS_ACL_VERSION_FUID);
	}

	static int
	zfs_acl_version_zp(znode_t *zp)
	{
	return (zfs_acl_version(zp->z_zfsvfs->z_version));
	}

	zfs_acl_t *
	zfs_acl_alloc(int vers)
	{
	zfs_acl_t *aclp;

	aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP);
	list_create(&aclp->z_acl, sizeof (zfs_acl_node_t),
	offsetof(zfs_acl_node_t, z_next));
	aclp->z_version = vers;
	if (vers == ZFS_ACL_VERSION_FUID)
	aclp->z_ops = &zfs_acl_fuid_ops;
	else
	aclp->z_ops = &zfs_acl_v0_ops;
	return (aclp);
	}

	zfs_acl_node_t *
	zfs_acl_node_alloc(size_t bytes)
	{
	zfs_acl_node_t *aclnode;

	aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP);
	if (bytes) {
	aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP);
	aclnode->z_allocdata = aclnode->z_acldata;
	aclnode->z_allocsize = bytes;
	aclnode->z_size = bytes;
	}

	return (aclnode);
	}

	static void
	zfs_acl_node_free(zfs_acl_node_t *aclnode)
	{
	if (aclnode->z_allocsize)
	kmem_free(aclnode->z_allocdata, aclnode->z_allocsize);
	kmem_free(aclnode, sizeof (zfs_acl_node_t));
	}

	static void
	zfs_acl_release_nodes(zfs_acl_t *aclp)
	{
	zfs_acl_node_t *aclnode;

	while ((aclnode = list_head(&aclp->z_acl))) {
	list_remove(&aclp->z_acl, aclnode);
	zfs_acl_node_free(aclnode);
	}
	aclp->z_acl_count = 0;
	aclp->z_acl_bytes = 0;
	}

	void
	zfs_acl_free(zfs_acl_t *aclp)
	{
	zfs_acl_release_nodes(aclp);
	list_destroy(&aclp->z_acl);
	kmem_free(aclp, sizeof (zfs_acl_t));
	}

	static boolean_t
	zfs_acl_valid_ace_type(uint_t type, uint_t flags)
	{
	uint16_t entry_type;

	switch (type) {
	case ALLOW:
	case DENY:
	case ACE_SYSTEM_AUDIT_ACE_TYPE:
	case ACE_SYSTEM_ALARM_ACE_TYPE:
	entry_type = flags & ACE_TYPE_FLAGS;
	return (entry_type == ACE_OWNER \|\|
	entry_type == OWNING_GROUP \|\|
	entry_type == ACE_EVERYONE \|\| entry_type == 0 \|\|
	entry_type == ACE_IDENTIFIER_GROUP);
	default:
	if (type >= MIN_ACE_TYPE && type <= MAX_ACE_TYPE)
	return (B_TRUE);
	}
	return (B_FALSE);
	}

	static boolean_t
	zfs_ace_valid(vtype_t obj_type, zfs_acl_t *aclp, uint16_t type, uint16_t iflags)
	{
	/*
	* first check type of entry
	*/

	if (!zfs_acl_valid_ace_type(type, iflags))
	return (B_FALSE);

	switch (type) {
	case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
	case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
	if (aclp->z_version < ZFS_ACL_VERSION_FUID)
	return (B_FALSE);
	aclp->z_hints \|= ZFS_ACL_OBJ_ACE;
	}

	/*
	* next check inheritance level flags
	*/

	if (obj_type == VDIR &&
	(iflags & (ACE_FILE_INHERIT_ACE\|ACE_DIRECTORY_INHERIT_ACE)))
	aclp->z_hints \|= ZFS_INHERIT_ACE;

	if (iflags & (ACE_INHERIT_ONLY_ACE\|ACE_NO_PROPAGATE_INHERIT_ACE)) {
	if ((iflags & (ACE_FILE_INHERIT_ACE\|
	ACE_DIRECTORY_INHERIT_ACE)) == 0) {
	return (B_FALSE);
	}
	}

	return (B_TRUE);
	}

	static void *
	zfs_acl_next_ace(zfs_acl_t aclp, void start, uint64_t *who,
	uint32_t access_mask, uint16_t iflags, uint16_t *type)
	{
	zfs_acl_node_t *aclnode;

	- ASSERT(aclp);
	+ ASSERT3P(aclp, !=, NULL);

	if (start == NULL) {
	aclnode = list_head(&aclp->z_acl);
	if (aclnode == NULL)
	return (NULL);

	aclp->z_next_ace = aclnode->z_acldata;
	aclp->z_curr_node = aclnode;
	aclnode->z_ace_idx = 0;
	}

	aclnode = aclp->z_curr_node;

	if (aclnode == NULL)
	return (NULL);

	if (aclnode->z_ace_idx >= aclnode->z_ace_count) {
	aclnode = list_next(&aclp->z_acl, aclnode);
	if (aclnode == NULL)
	return (NULL);
	else {
	aclp->z_curr_node = aclnode;
	aclnode->z_ace_idx = 0;
	aclp->z_next_ace = aclnode->z_acldata;
	}
	}

	if (aclnode->z_ace_idx < aclnode->z_ace_count) {
	void *acep = aclp->z_next_ace;
	size_t ace_size;

	/*
	* Make sure we don't overstep our bounds
	*/
	ace_size = aclp->z_ops->ace_size(acep);

	if (((caddr_t)acep + ace_size) >
	((caddr_t)aclnode->z_acldata + aclnode->z_size)) {
	return (NULL);
	}

	*iflags = aclp->z_ops->ace_flags_get(acep);
	*type = aclp->z_ops->ace_type_get(acep);
	*access_mask = aclp->z_ops->ace_mask_get(acep);
	*who = aclp->z_ops->ace_who_get(acep);
	aclp->z_next_ace = (caddr_t)aclp->z_next_ace + ace_size;
	aclnode->z_ace_idx++;

	return ((void *)acep);
	}
	return (NULL);
	}

	/ARGSUSED/
	static uint64_t
	zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt,
	uint16_t flags, uint16_t type, uint32_t *mask)
	{
	zfs_acl_t *aclp = datap;
	zfs_ace_hdr_t acep = (zfs_ace_hdr_t )(uintptr_t)cookie;
	uint64_t who;

	acep = zfs_acl_next_ace(aclp, acep, &who, mask,
	flags, type);
	return ((uint64_t)(uintptr_t)acep);
	}

	/*
	* Copy ACE to internal ZFS format.
	* While processing the ACL each ACE will be validated for correctness.
	* ACE FUIDs will be created later.
	*/
	static int
	zfs_copy_ace_2_fuid(zfsvfs_t zfsvfs, vtype_t obj_type, zfs_acl_t aclp,
	void datap, zfs_ace_t z_acl, uint64_t aclcnt, size_t *size,
	zfs_fuid_info_t *fuidp, cred_t cr)
	{
	int i;
	uint16_t entry_type;
	zfs_ace_t *aceptr = z_acl;
	ace_t *acep = datap;
	zfs_object_ace_t *zobjacep;
	ace_object_t *aceobjp;

	for (i = 0; i != aclcnt; i++) {
	aceptr->z_hdr.z_access_mask = acep->a_access_mask;
	aceptr->z_hdr.z_flags = acep->a_flags;
	aceptr->z_hdr.z_type = acep->a_type;
	entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS;
	if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP &&
	entry_type != ACE_EVERYONE) {
	aceptr->z_fuid = zfs_fuid_create(zfsvfs, acep->a_who,
	cr, (entry_type == 0) ?
	ZFS_ACE_USER : ZFS_ACE_GROUP, fuidp);
	}

	/*
	* Make sure ACE is valid
	*/
	if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type,
	aceptr->z_hdr.z_flags) != B_TRUE)
	return (SET_ERROR(EINVAL));

	switch (acep->a_type) {
	case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
	case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
	zobjacep = (zfs_object_ace_t *)aceptr;
	aceobjp = (ace_object_t *)acep;

	bcopy(aceobjp->a_obj_type, zobjacep->z_object_type,
	sizeof (aceobjp->a_obj_type));
	bcopy(aceobjp->a_inherit_obj_type,
	zobjacep->z_inherit_type,
	sizeof (aceobjp->a_inherit_obj_type));
	acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t));
	break;
	default:
	acep = (ace_t *)((caddr_t)acep + sizeof (ace_t));
	}

	aceptr = (zfs_ace_t *)((caddr_t)aceptr +
	aclp->z_ops->ace_size(aceptr));
	}

	*size = (caddr_t)aceptr - (caddr_t)z_acl;

	return (0);
	}

	/*
	* Copy ZFS ACEs to fixed size ace_t layout
	*/
	static void
	zfs_copy_fuid_2_ace(zfsvfs_t zfsvfs, zfs_acl_t aclp, cred_t *cr,
	void *datap, int filter)
	{
	uint64_t who;
	uint32_t access_mask;
	uint16_t iflags, type;
	zfs_ace_hdr_t *zacep = NULL;
	ace_t *acep = datap;
	ace_object_t *objacep;
	zfs_object_ace_t *zobjacep;
	size_t ace_size;
	uint16_t entry_type;

	while ((zacep = zfs_acl_next_ace(aclp, zacep,
	&who, &access_mask, &iflags, &type))) {

	switch (type) {
	case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
	case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
	if (filter) {
	continue;
	}
	zobjacep = (zfs_object_ace_t *)zacep;
	objacep = (ace_object_t *)acep;
	bcopy(zobjacep->z_object_type,
	objacep->a_obj_type,
	sizeof (zobjacep->z_object_type));
	bcopy(zobjacep->z_inherit_type,
	objacep->a_inherit_obj_type,
	sizeof (zobjacep->z_inherit_type));
	ace_size = sizeof (ace_object_t);
	break;
	default:
	ace_size = sizeof (ace_t);
	break;
	}

	entry_type = (iflags & ACE_TYPE_FLAGS);
	if ((entry_type != ACE_OWNER &&
	entry_type != OWNING_GROUP &&
	entry_type != ACE_EVERYONE)) {
	acep->a_who = zfs_fuid_map_id(zfsvfs, who,
	cr, (entry_type & ACE_IDENTIFIER_GROUP) ?
	ZFS_ACE_GROUP : ZFS_ACE_USER);
	} else {
	acep->a_who = (uid_t)(int64_t)who;
	}
	acep->a_access_mask = access_mask;
	acep->a_flags = iflags;
	acep->a_type = type;
	acep = (ace_t *)((caddr_t)acep + ace_size);
	}
	}

	static int
	zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t aclp, ace_t acep,
	zfs_oldace_t z_acl, int aclcnt, size_t size)
	{
	int i;
	zfs_oldace_t *aceptr = z_acl;

	for (i = 0; i != aclcnt; i++, aceptr++) {
	aceptr->z_access_mask = acep[i].a_access_mask;
	aceptr->z_type = acep[i].a_type;
	aceptr->z_flags = acep[i].a_flags;
	aceptr->z_fuid = acep[i].a_who;
	/*
	* Make sure ACE is valid
	*/
	if (zfs_ace_valid(obj_type, aclp, aceptr->z_type,
	aceptr->z_flags) != B_TRUE)
	return (SET_ERROR(EINVAL));
	}
	*size = (caddr_t)aceptr - (caddr_t)z_acl;
	return (0);
	}

	/*
	* convert old ACL format to new
	*/
	void
	zfs_acl_xform(znode_t zp, zfs_acl_t aclp, cred_t *cr)
	{
	zfs_oldace_t *oldaclp;
	int i;
	uint16_t type, iflags;
	uint32_t access_mask;
	uint64_t who;
	void *cookie = NULL;
	zfs_acl_node_t *newaclnode;

	- ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL);
	+ ASSERT3U(aclp->z_version, ==, ZFS_ACL_VERSION_INITIAL);
	/*
	* First create the ACE in a contiguous piece of memory
	* for zfs_copy_ace_2_fuid().
	*
	* We only convert an ACL once, so this won't happen
	* everytime.
	*/
	oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count,
	KM_SLEEP);
	i = 0;
	while ((cookie = zfs_acl_next_ace(aclp, cookie, &who,
	&access_mask, &iflags, &type))) {
	oldaclp[i].z_flags = iflags;
	oldaclp[i].z_type = type;
	oldaclp[i].z_fuid = who;
	oldaclp[i++].z_access_mask = access_mask;
	}

	newaclnode = zfs_acl_node_alloc(aclp->z_acl_count *
	sizeof (zfs_object_ace_t));
	aclp->z_ops = &zfs_acl_fuid_ops;
	- VERIFY(zfs_copy_ace_2_fuid(zp->z_zfsvfs, ZTOV(zp)->v_type, aclp,
	+ VERIFY0(zfs_copy_ace_2_fuid(zp->z_zfsvfs, ZTOV(zp)->v_type, aclp,
	oldaclp, newaclnode->z_acldata, aclp->z_acl_count,
	- &newaclnode->z_size, NULL, cr) == 0);
	+ &newaclnode->z_size, NULL, cr));
	newaclnode->z_ace_count = aclp->z_acl_count;
	aclp->z_version = ZFS_ACL_VERSION;
	kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t));

	/*
	* Release all previous ACL nodes
	*/

	zfs_acl_release_nodes(aclp);

	list_insert_head(&aclp->z_acl, newaclnode);

	aclp->z_acl_bytes = newaclnode->z_size;
	aclp->z_acl_count = newaclnode->z_ace_count;

	}

	/*
	* Convert unix access mask to v4 access mask
	*/
	static uint32_t
	zfs_unix_to_v4(uint32_t access_mask)
	{
	uint32_t new_mask = 0;

	if (access_mask & S_IXOTH)
	new_mask \|= ACE_EXECUTE;
	if (access_mask & S_IWOTH)
	new_mask \|= ACE_WRITE_DATA;
	if (access_mask & S_IROTH)
	new_mask \|= ACE_READ_DATA;
	return (new_mask);
	}

	static void
	zfs_set_ace(zfs_acl_t aclp, void acep, uint32_t access_mask,
	uint16_t access_type, uint64_t fuid, uint16_t entry_type)
	{
	uint16_t type = entry_type & ACE_TYPE_FLAGS;

	aclp->z_ops->ace_mask_set(acep, access_mask);
	aclp->z_ops->ace_type_set(acep, access_type);
	aclp->z_ops->ace_flags_set(acep, entry_type);
	if ((type != ACE_OWNER && type != OWNING_GROUP &&
	type != ACE_EVERYONE))
	aclp->z_ops->ace_who_set(acep, fuid);
	}

	/*
	* Determine mode of file based on ACL.
	*/
	uint64_t
	zfs_mode_compute(uint64_t fmode, zfs_acl_t *aclp,
	uint64_t *pflags, uint64_t fuid, uint64_t fgid)
	{
	int entry_type;
	mode_t mode;
	mode_t seen = 0;
	zfs_ace_hdr_t *acep = NULL;
	uint64_t who;
	uint16_t iflags, type;
	uint32_t access_mask;
	boolean_t an_exec_denied = B_FALSE;

	mode = (fmode & (S_IFMT \| S_ISUID \| S_ISGID \| S_ISVTX));

	while ((acep = zfs_acl_next_ace(aclp, acep, &who,
	&access_mask, &iflags, &type))) {

	if (!zfs_acl_valid_ace_type(type, iflags))
	continue;

	entry_type = (iflags & ACE_TYPE_FLAGS);

	/*
	* Skip over any inherit_only ACEs
	*/
	if (iflags & ACE_INHERIT_ONLY_ACE)
	continue;

	if (entry_type == ACE_OWNER \|\| (entry_type == 0 &&
	who == fuid)) {
	if ((access_mask & ACE_READ_DATA) &&
	(!(seen & S_IRUSR))) {
	seen \|= S_IRUSR;
	if (type == ALLOW) {
	mode \|= S_IRUSR;
	}
	}
	if ((access_mask & ACE_WRITE_DATA) &&
	(!(seen & S_IWUSR))) {
	seen \|= S_IWUSR;
	if (type == ALLOW) {
	mode \|= S_IWUSR;
	}
	}
	if ((access_mask & ACE_EXECUTE) &&
	(!(seen & S_IXUSR))) {
	seen \|= S_IXUSR;
	if (type == ALLOW) {
	mode \|= S_IXUSR;
	}
	}
	} else if (entry_type == OWNING_GROUP \|\|
	(entry_type == ACE_IDENTIFIER_GROUP && who == fgid)) {
	if ((access_mask & ACE_READ_DATA) &&
	(!(seen & S_IRGRP))) {
	seen \|= S_IRGRP;
	if (type == ALLOW) {
	mode \|= S_IRGRP;
	}
	}
	if ((access_mask & ACE_WRITE_DATA) &&
	(!(seen & S_IWGRP))) {
	seen \|= S_IWGRP;
	if (type == ALLOW) {
	mode \|= S_IWGRP;
	}
	}
	if ((access_mask & ACE_EXECUTE) &&
	(!(seen & S_IXGRP))) {
	seen \|= S_IXGRP;
	if (type == ALLOW) {
	mode \|= S_IXGRP;
	}
	}
	} else if (entry_type == ACE_EVERYONE) {
	if ((access_mask & ACE_READ_DATA)) {
	if (!(seen & S_IRUSR)) {
	seen \|= S_IRUSR;
	if (type == ALLOW) {
	mode \|= S_IRUSR;
	}
	}
	if (!(seen & S_IRGRP)) {
	seen \|= S_IRGRP;
	if (type == ALLOW) {
	mode \|= S_IRGRP;
	}
	}
	if (!(seen & S_IROTH)) {
	seen \|= S_IROTH;
	if (type == ALLOW) {
	mode \|= S_IROTH;
	}
	}
	}
	if ((access_mask & ACE_WRITE_DATA)) {
	if (!(seen & S_IWUSR)) {
	seen \|= S_IWUSR;
	if (type == ALLOW) {
	mode \|= S_IWUSR;
	}
	}
	if (!(seen & S_IWGRP)) {
	seen \|= S_IWGRP;
	if (type == ALLOW) {
	mode \|= S_IWGRP;
	}
	}
	if (!(seen & S_IWOTH)) {
	seen \|= S_IWOTH;
	if (type == ALLOW) {
	mode \|= S_IWOTH;
	}
	}
	}
	if ((access_mask & ACE_EXECUTE)) {
	if (!(seen & S_IXUSR)) {
	seen \|= S_IXUSR;
	if (type == ALLOW) {
	mode \|= S_IXUSR;
	}
	}
	if (!(seen & S_IXGRP)) {
	seen \|= S_IXGRP;
	if (type == ALLOW) {
	mode \|= S_IXGRP;
	}
	}
	if (!(seen & S_IXOTH)) {
	seen \|= S_IXOTH;
	if (type == ALLOW) {
	mode \|= S_IXOTH;
	}
	}
	}
	} else {
	/*
	* Only care if this IDENTIFIER_GROUP or
	* USER ACE denies execute access to someone,
	* mode is not affected
	*/
	if ((access_mask & ACE_EXECUTE) && type == DENY)
	an_exec_denied = B_TRUE;
	}
	}

	/*
	* Failure to allow is effectively a deny, so execute permission
	* is denied if it was never mentioned or if we explicitly
	* weren't allowed it.
	*/
	if (!an_exec_denied &&
	((seen & ALL_MODE_EXECS) != ALL_MODE_EXECS \|\|
	(mode & ALL_MODE_EXECS) != ALL_MODE_EXECS))
	an_exec_denied = B_TRUE;

	if (an_exec_denied)
	*pflags &= ~ZFS_NO_EXECS_DENIED;
	else
	*pflags \|= ZFS_NO_EXECS_DENIED;

	return (mode);
	}

	/*
	* Read an external acl object. If the intent is to modify, always
	* create a new acl and leave any cached acl in place.
	*/
	int
	zfs_acl_node_read(znode_t zp, boolean_t have_lock, zfs_acl_t *aclpp,
	boolean_t will_modify)
	{
	zfs_acl_t *aclp;
	int aclsize;
	int acl_count;
	zfs_acl_node_t *aclnode;
	zfs_acl_phys_t znode_acl;
	int version;
	int error;

	ASSERT(MUTEX_HELD(&zp->z_acl_lock));
	if (zp->z_zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_LOCKED(ZTOV(zp), __func__);

	if (zp->z_acl_cached && !will_modify) {
	*aclpp = zp->z_acl_cached;
	return (0);
	}

	version = zfs_znode_acl_version(zp);

	if ((error = zfs_acl_znode_info(zp, &aclsize,
	&acl_count, &znode_acl)) != 0) {
	goto done;
	}

	aclp = zfs_acl_alloc(version);

	aclp->z_acl_count = acl_count;
	aclp->z_acl_bytes = aclsize;

	aclnode = zfs_acl_node_alloc(aclsize);
	aclnode->z_ace_count = aclp->z_acl_count;
	aclnode->z_size = aclsize;

	if (!zp->z_is_sa) {
	if (znode_acl.z_acl_extern_obj) {
	error = dmu_read(zp->z_zfsvfs->z_os,
	znode_acl.z_acl_extern_obj, 0, aclnode->z_size,
	aclnode->z_acldata, DMU_READ_PREFETCH);
	} else {
	bcopy(znode_acl.z_ace_data, aclnode->z_acldata,
	aclnode->z_size);
	}
	} else {
	error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zp->z_zfsvfs),
	aclnode->z_acldata, aclnode->z_size);
	}

	if (error != 0) {
	zfs_acl_free(aclp);
	zfs_acl_node_free(aclnode);
	/* convert checksum errors into IO errors */
	if (error == ECKSUM)
	error = SET_ERROR(EIO);
	goto done;
	}

	list_insert_head(&aclp->z_acl, aclnode);

	*aclpp = aclp;
	if (!will_modify)
	zp->z_acl_cached = aclp;
	done:
	return (error);
	}

	/ARGSUSED/
	void
	zfs_acl_data_locator(void *dataptr, uint32_t length, uint32_t buflen,
	boolean_t start, void *userdata)
	{
	zfs_acl_locator_cb_t cb = (zfs_acl_locator_cb_t )userdata;

	if (start) {
	cb->cb_acl_node = list_head(&cb->cb_aclp->z_acl);
	} else {
	cb->cb_acl_node = list_next(&cb->cb_aclp->z_acl,
	cb->cb_acl_node);
	}
	*dataptr = cb->cb_acl_node->z_acldata;
	*length = cb->cb_acl_node->z_size;
	}

	int
	zfs_acl_chown_setattr(znode_t *zp)
	{
	int error;
	zfs_acl_t *aclp;

	if (zp->z_zfsvfs->z_replay == B_FALSE) {
	ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
	ASSERT_VOP_IN_SEQC(ZTOV(zp));
	}
	ASSERT(MUTEX_HELD(&zp->z_acl_lock));

	if ((error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE)) == 0)
	zp->z_mode = zfs_mode_compute(zp->z_mode, aclp,
	&zp->z_pflags, zp->z_uid, zp->z_gid);
	return (error);
	}

	/*
	* common code for setting ACLs.
	*
	* This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl.
	* zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's
	* already checked the acl and knows whether to inherit.
	*/
	int
	zfs_aclset_common(znode_t zp, zfs_acl_t aclp, cred_t cr, dmu_tx_t tx)
	{
	int error;
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	dmu_object_type_t otype;
	zfs_acl_locator_cb_t locate = { 0 };
	uint64_t mode;
	sa_bulk_attr_t bulk[5];
	uint64_t ctime[2];
	int count = 0;
	zfs_acl_phys_t acl_phys;

	if (zp->z_zfsvfs->z_replay == B_FALSE) {
	ASSERT_VOP_IN_SEQC(ZTOV(zp));
	}

	mode = zp->z_mode;

	mode = zfs_mode_compute(mode, aclp, &zp->z_pflags,
	zp->z_uid, zp->z_gid);

	zp->z_mode = mode;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
	&mode, sizeof (mode));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, sizeof (zp->z_pflags));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	&ctime, sizeof (ctime));

	if (zp->z_acl_cached) {
	zfs_acl_free(zp->z_acl_cached);
	zp->z_acl_cached = NULL;
	}

	/*
	* Upgrade needed?
	*/
	if (!zfsvfs->z_use_fuids) {
	otype = DMU_OT_OLDACL;
	} else {
	if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) &&
	(zfsvfs->z_version >= ZPL_VERSION_FUID))
	zfs_acl_xform(zp, aclp, cr);
	- ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID);
	+ ASSERT3U(aclp->z_version, >=, ZFS_ACL_VERSION_FUID);
	otype = DMU_OT_ACL;
	}

	/*
	* Arrgh, we have to handle old on disk format
	* as well as newer (preferred) SA format.
	*/

	if (zp->z_is_sa) { /* the easy case, just update the ACL attribute */
	locate.cb_aclp = aclp;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_ACES(zfsvfs),
	zfs_acl_data_locator, &locate, aclp->z_acl_bytes);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_COUNT(zfsvfs),
	NULL, &aclp->z_acl_count, sizeof (uint64_t));
	} else { /* Painful legacy way */
	zfs_acl_node_t *aclnode;
	uint64_t off = 0;
	uint64_t aoid;

	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
	&acl_phys, sizeof (acl_phys))) != 0)
	return (error);

	aoid = acl_phys.z_acl_extern_obj;

	if (aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	/*
	* If ACL was previously external and we are now
	* converting to new ACL format then release old
	* ACL object and create a new one.
	*/
	if (aoid &&
	aclp->z_version != acl_phys.z_acl_version) {
	error = dmu_object_free(zfsvfs->z_os, aoid, tx);
	if (error)
	return (error);
	aoid = 0;
	}
	if (aoid == 0) {
	aoid = dmu_object_alloc(zfsvfs->z_os,
	otype, aclp->z_acl_bytes,
	otype == DMU_OT_ACL ?
	DMU_OT_SYSACL : DMU_OT_NONE,
	otype == DMU_OT_ACL ?
	DN_OLD_MAX_BONUSLEN : 0, tx);
	} else {
	(void) dmu_object_set_blocksize(zfsvfs->z_os,
	aoid, aclp->z_acl_bytes, 0, tx);
	}
	acl_phys.z_acl_extern_obj = aoid;
	for (aclnode = list_head(&aclp->z_acl); aclnode;
	aclnode = list_next(&aclp->z_acl, aclnode)) {
	if (aclnode->z_ace_count == 0)
	continue;
	dmu_write(zfsvfs->z_os, aoid, off,
	aclnode->z_size, aclnode->z_acldata, tx);
	off += aclnode->z_size;
	}
	} else {
	void *start = acl_phys.z_ace_data;
	/*
	* Migrating back embedded?
	*/
	if (acl_phys.z_acl_extern_obj) {
	error = dmu_object_free(zfsvfs->z_os,
	acl_phys.z_acl_extern_obj, tx);
	if (error)
	return (error);
	acl_phys.z_acl_extern_obj = 0;
	}

	for (aclnode = list_head(&aclp->z_acl); aclnode;
	aclnode = list_next(&aclp->z_acl, aclnode)) {
	if (aclnode->z_ace_count == 0)
	continue;
	bcopy(aclnode->z_acldata, start,
	aclnode->z_size);
	start = (caddr_t)start + aclnode->z_size;
	}
	}
	/*
	* If Old version then swap count/bytes to match old
	* layout of znode_acl_phys_t.
	*/
	if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
	acl_phys.z_acl_size = aclp->z_acl_count;
	acl_phys.z_acl_count = aclp->z_acl_bytes;
	} else {
	acl_phys.z_acl_size = aclp->z_acl_bytes;
	acl_phys.z_acl_count = aclp->z_acl_count;
	}
	acl_phys.z_acl_version = aclp->z_version;

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
	&acl_phys, sizeof (acl_phys));
	}

	/*
	* Replace ACL wide bits, but first clear them.
	*/
	zp->z_pflags &= ~ZFS_ACL_WIDE_FLAGS;

	zp->z_pflags \|= aclp->z_hints;

	if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0)
	zp->z_pflags \|= ZFS_ACL_TRIVIAL;

	zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime);
	return (sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
	}

	static void
	zfs_acl_chmod(vtype_t vtype, uint64_t mode, boolean_t split, boolean_t trim,
	zfs_acl_t *aclp)
	{
	void *acep = NULL;
	uint64_t who;
	int new_count, new_bytes;
	int ace_size;
	int entry_type;
	uint16_t iflags, type;
	uint32_t access_mask;
	zfs_acl_node_t *newnode;
	size_t abstract_size = aclp->z_ops->ace_abstract_size();
	void *zacep;
	boolean_t isdir;
	trivial_acl_t masks;

	new_count = new_bytes = 0;

	isdir = (vtype == VDIR);

	acl_trivial_access_masks((mode_t)mode, isdir, &masks);

	newnode = zfs_acl_node_alloc((abstract_size * 6) + aclp->z_acl_bytes);

	zacep = newnode->z_acldata;
	if (masks.allow0) {
	zfs_set_ace(aclp, zacep, masks.allow0, ALLOW, -1, ACE_OWNER);
	zacep = (void *)((uintptr_t)zacep + abstract_size);
	new_count++;
	new_bytes += abstract_size;
	}
	if (masks.deny1) {
	zfs_set_ace(aclp, zacep, masks.deny1, DENY, -1, ACE_OWNER);
	zacep = (void *)((uintptr_t)zacep + abstract_size);
	new_count++;
	new_bytes += abstract_size;
	}
	if (masks.deny2) {
	zfs_set_ace(aclp, zacep, masks.deny2, DENY, -1, OWNING_GROUP);
	zacep = (void *)((uintptr_t)zacep + abstract_size);
	new_count++;
	new_bytes += abstract_size;
	}

	while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
	&iflags, &type))) {
	entry_type = (iflags & ACE_TYPE_FLAGS);
	/*
	* ACEs used to represent the file mode may be divided
	* into an equivalent pair of inherit-only and regular
	* ACEs, if they are inheritable.
	* Skip regular ACEs, which are replaced by the new mode.
	*/
	if (split && (entry_type == ACE_OWNER \|\|
	entry_type == OWNING_GROUP \|\|
	entry_type == ACE_EVERYONE)) {
	if (!isdir \|\| !(iflags &
	(ACE_FILE_INHERIT_ACE\|ACE_DIRECTORY_INHERIT_ACE)))
	continue;
	/*
	* We preserve owner@, group@, or @everyone
	* permissions, if they are inheritable, by
	* copying them to inherit_only ACEs. This
	* prevents inheritable permissions from being
	* altered along with the file mode.
	*/
	iflags \|= ACE_INHERIT_ONLY_ACE;
	}

	/*
	* If this ACL has any inheritable ACEs, mark that in
	* the hints (which are later masked into the pflags)
	* so create knows to do inheritance.
	*/
	if (isdir && (iflags &
	(ACE_FILE_INHERIT_ACE\|ACE_DIRECTORY_INHERIT_ACE)))
	aclp->z_hints \|= ZFS_INHERIT_ACE;

	if ((type != ALLOW && type != DENY) \|\|
	(iflags & ACE_INHERIT_ONLY_ACE)) {
	switch (type) {
	case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
	case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
	aclp->z_hints \|= ZFS_ACL_OBJ_ACE;
	break;
	}
	} else {
	/*
	* Limit permissions granted by ACEs to be no greater
	* than permissions of the requested group mode.
	* Applies when the "aclmode" property is set to
	* "groupmask".
	*/
	if ((type == ALLOW) && trim)
	access_mask &= masks.group;
	}
	zfs_set_ace(aclp, zacep, access_mask, type, who, iflags);
	ace_size = aclp->z_ops->ace_size(acep);
	zacep = (void *)((uintptr_t)zacep + ace_size);
	new_count++;
	new_bytes += ace_size;
	}
	zfs_set_ace(aclp, zacep, masks.owner, ALLOW, -1, ACE_OWNER);
	zacep = (void *)((uintptr_t)zacep + abstract_size);
	zfs_set_ace(aclp, zacep, masks.group, ALLOW, -1, OWNING_GROUP);
	zacep = (void *)((uintptr_t)zacep + abstract_size);
	zfs_set_ace(aclp, zacep, masks.everyone, ALLOW, -1, ACE_EVERYONE);

	new_count += 3;
	new_bytes += abstract_size * 3;
	zfs_acl_release_nodes(aclp);
	aclp->z_acl_count = new_count;
	aclp->z_acl_bytes = new_bytes;
	newnode->z_ace_count = new_count;
	newnode->z_size = new_bytes;
	list_insert_tail(&aclp->z_acl, newnode);
	}

	int
	zfs_acl_chmod_setattr(znode_t zp, zfs_acl_t *aclp, uint64_t mode)
	{
	int error = 0;

	mutex_enter(&zp->z_acl_lock);
	if (zp->z_zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
	if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_DISCARD)
	*aclp = zfs_acl_alloc(zfs_acl_version_zp(zp));
	else
	error = zfs_acl_node_read(zp, B_TRUE, aclp, B_TRUE);

	if (error == 0) {
	(*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS;
	zfs_acl_chmod(ZTOV(zp)->v_type, mode, B_TRUE,
	(zp->z_zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK), *aclp);
	}
	mutex_exit(&zp->z_acl_lock);

	return (error);
	}

	/*
	* Should ACE be inherited?
	*/
	static int
	zfs_ace_can_use(vtype_t vtype, uint16_t acep_flags)
	{
	int iflags = (acep_flags & 0xf);

	if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE))
	return (1);
	else if (iflags & ACE_FILE_INHERIT_ACE)
	return (!((vtype == VDIR) &&
	(iflags & ACE_NO_PROPAGATE_INHERIT_ACE)));
	return (0);
	}

	/*
	* inherit inheritable ACEs from parent
	*/
	static zfs_acl_t *
	zfs_acl_inherit(zfsvfs_t zfsvfs, vtype_t vtype, zfs_acl_t paclp,
	uint64_t mode, boolean_t *need_chmod)
	{
	void *pacep = NULL;
	void *acep;
	zfs_acl_node_t *aclnode;
	zfs_acl_t *aclp = NULL;
	uint64_t who;
	uint32_t access_mask;
	uint16_t iflags, newflags, type;
	size_t ace_size;
	void data1, data2;
	size_t data1sz, data2sz;
	uint_t aclinherit;
	boolean_t isdir = (vtype == VDIR);
	boolean_t isreg = (vtype == VREG);

	*need_chmod = B_TRUE;

	aclp = zfs_acl_alloc(paclp->z_version);
	aclinherit = zfsvfs->z_acl_inherit;
	if (aclinherit == ZFS_ACL_DISCARD \|\| vtype == VLNK)
	return (aclp);

	while ((pacep = zfs_acl_next_ace(paclp, pacep, &who,
	&access_mask, &iflags, &type))) {

	/*
	* don't inherit bogus ACEs
	*/
	if (!zfs_acl_valid_ace_type(type, iflags))
	continue;

	/*
	* Check if ACE is inheritable by this vnode
	*/
	if ((aclinherit == ZFS_ACL_NOALLOW && type == ALLOW) \|\|
	!zfs_ace_can_use(vtype, iflags))
	continue;

	/*
	* If owner@, group@, or everyone@ inheritable
	* then zfs_acl_chmod() isn't needed.
	*/
	if ((aclinherit == ZFS_ACL_PASSTHROUGH \|\|
	aclinherit == ZFS_ACL_PASSTHROUGH_X) &&
	((iflags & (ACE_OWNER\|ACE_EVERYONE)) \|\|
	((iflags & OWNING_GROUP) == OWNING_GROUP)) &&
	(isreg \|\| (isdir && (iflags & ACE_DIRECTORY_INHERIT_ACE))))
	*need_chmod = B_FALSE;

	/*
	* Strip inherited execute permission from file if
	* not in mode
	*/
	if (aclinherit == ZFS_ACL_PASSTHROUGH_X && type == ALLOW &&
	!isdir && ((mode & (S_IXUSR\|S_IXGRP\|S_IXOTH)) == 0)) {
	access_mask &= ~ACE_EXECUTE;
	}

	/*
	* Strip write_acl and write_owner from permissions
	* when inheriting an ACE
	*/
	if (aclinherit == ZFS_ACL_RESTRICTED && type == ALLOW) {
	access_mask &= ~RESTRICTED_CLEAR;
	}

	ace_size = aclp->z_ops->ace_size(pacep);
	aclnode = zfs_acl_node_alloc(ace_size);
	list_insert_tail(&aclp->z_acl, aclnode);
	acep = aclnode->z_acldata;

	zfs_set_ace(aclp, acep, access_mask, type,
	who, iflags\|ACE_INHERITED_ACE);

	/*
	* Copy special opaque data if any
	*/
	if ((data1sz = paclp->z_ops->ace_data(pacep, &data1)) != 0) {
	- VERIFY((data2sz = aclp->z_ops->ace_data(acep,
	- &data2)) == data1sz);
	+ data2sz = aclp->z_ops->ace_data(acep, &data2);
	+ VERIFY3U(data2sz, ==, data1sz);
	bcopy(data1, data2, data2sz);
	}

	aclp->z_acl_count++;
	aclnode->z_ace_count++;
	aclp->z_acl_bytes += aclnode->z_size;
	newflags = aclp->z_ops->ace_flags_get(acep);

	/*
	* If ACE is not to be inherited further, or if the vnode is
	* not a directory, remove all inheritance flags
	*/
	if (!isdir \|\| (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)) {
	newflags &= ~ALL_INHERIT;
	aclp->z_ops->ace_flags_set(acep,
	newflags\|ACE_INHERITED_ACE);
	continue;
	}

	/*
	* This directory has an inheritable ACE
	*/
	aclp->z_hints \|= ZFS_INHERIT_ACE;

	/*
	* If only FILE_INHERIT is set then turn on
	* inherit_only
	*/
	if ((iflags & (ACE_FILE_INHERIT_ACE \|
	ACE_DIRECTORY_INHERIT_ACE)) == ACE_FILE_INHERIT_ACE) {
	newflags \|= ACE_INHERIT_ONLY_ACE;
	aclp->z_ops->ace_flags_set(acep,
	newflags\|ACE_INHERITED_ACE);
	} else {
	newflags &= ~ACE_INHERIT_ONLY_ACE;
	aclp->z_ops->ace_flags_set(acep,
	newflags\|ACE_INHERITED_ACE);
	}
	}
	if (zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED &&
	aclp->z_acl_count != 0) {
	*need_chmod = B_FALSE;
	}

	return (aclp);
	}

	/*
	* Create file system object initial permissions
	* including inheritable ACEs.
	* Also, create FUIDs for owner and group.
	*/
	int
	zfs_acl_ids_create(znode_t dzp, int flag, vattr_t vap, cred_t *cr,
	vsecattr_t vsecp, zfs_acl_ids_t acl_ids)
	{
	int error;
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	zfs_acl_t *paclp;
	gid_t gid;
	boolean_t need_chmod = B_TRUE;
	boolean_t trim = B_FALSE;
	boolean_t inherited = B_FALSE;

	if ((flag & IS_ROOT_NODE) == 0) {
	if (zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_ELOCKED(ZTOV(dzp), __func__);
	} else
	- ASSERT(dzp->z_vnode == NULL);
	+ ASSERT3P(dzp->z_vnode, ==, NULL);
	bzero(acl_ids, sizeof (zfs_acl_ids_t));
	acl_ids->z_mode = MAKEIMODE(vap->va_type, vap->va_mode);

	if (vsecp)
	if ((error = zfs_vsec_2_aclp(zfsvfs, vap->va_type, vsecp, cr,
	&acl_ids->z_fuidp, &acl_ids->z_aclp)) != 0)
	return (error);
	/*
	* Determine uid and gid.
	*/
	if ((flag & IS_ROOT_NODE) \|\| zfsvfs->z_replay \|\|
	((flag & IS_XATTR) && (vap->va_type == VDIR))) {
	acl_ids->z_fuid = zfs_fuid_create(zfsvfs,
	(uint64_t)vap->va_uid, cr,
	ZFS_OWNER, &acl_ids->z_fuidp);
	acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
	(uint64_t)vap->va_gid, cr,
	ZFS_GROUP, &acl_ids->z_fuidp);
	gid = vap->va_gid;
	} else {
	acl_ids->z_fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER,
	cr, &acl_ids->z_fuidp);
	acl_ids->z_fgid = 0;
	if (vap->va_mask & AT_GID) {
	acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
	(uint64_t)vap->va_gid,
	cr, ZFS_GROUP, &acl_ids->z_fuidp);
	gid = vap->va_gid;
	if (acl_ids->z_fgid != dzp->z_gid &&
	!groupmember(vap->va_gid, cr) &&
	secpolicy_vnode_create_gid(cr) != 0)
	acl_ids->z_fgid = 0;
	}
	if (acl_ids->z_fgid == 0) {
	char *domain;
	uint32_t rid;

	acl_ids->z_fgid = dzp->z_gid;
	gid = zfs_fuid_map_id(zfsvfs, acl_ids->z_fgid,
	cr, ZFS_GROUP);

	if (zfsvfs->z_use_fuids &&
	IS_EPHEMERAL(acl_ids->z_fgid)) {
	domain =
	zfs_fuid_idx_domain(&zfsvfs->z_fuid_idx,
	FUID_INDEX(acl_ids->z_fgid));
	rid = FUID_RID(acl_ids->z_fgid);
	zfs_fuid_node_add(&acl_ids->z_fuidp,
	domain, rid, FUID_INDEX(acl_ids->z_fgid),
	acl_ids->z_fgid, ZFS_GROUP);
	}
	}
	}

	/*
	* If we're creating a directory, and the parent directory has the
	* set-GID bit set, set in on the new directory.
	* Otherwise, if the user is neither privileged nor a member of the
	* file's new group, clear the file's set-GID bit.
	*/

	if (!(flag & IS_ROOT_NODE) && (dzp->z_mode & S_ISGID) &&
	(vap->va_type == VDIR)) {
	acl_ids->z_mode \|= S_ISGID;
	} else {
	if ((acl_ids->z_mode & S_ISGID) &&
	secpolicy_vnode_setids_setgids(ZTOV(dzp), cr, gid) != 0)
	acl_ids->z_mode &= ~S_ISGID;
	}

	if (acl_ids->z_aclp == NULL) {
	mutex_enter(&dzp->z_acl_lock);
	if (!(flag & IS_ROOT_NODE) &&
	(dzp->z_pflags & ZFS_INHERIT_ACE) &&
	!(dzp->z_pflags & ZFS_XATTR)) {
	VERIFY0(zfs_acl_node_read(dzp, B_TRUE,
	&paclp, B_FALSE));
	acl_ids->z_aclp = zfs_acl_inherit(zfsvfs,
	vap->va_type, paclp, acl_ids->z_mode, &need_chmod);
	inherited = B_TRUE;
	} else {
	acl_ids->z_aclp =
	zfs_acl_alloc(zfs_acl_version_zp(dzp));
	acl_ids->z_aclp->z_hints \|= ZFS_ACL_TRIVIAL;
	}
	mutex_exit(&dzp->z_acl_lock);

	if (need_chmod) {
	if (vap->va_type == VDIR)
	acl_ids->z_aclp->z_hints \|=
	ZFS_ACL_AUTO_INHERIT;

	if (zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK &&
	zfsvfs->z_acl_inherit != ZFS_ACL_PASSTHROUGH &&
	zfsvfs->z_acl_inherit != ZFS_ACL_PASSTHROUGH_X)
	trim = B_TRUE;
	zfs_acl_chmod(vap->va_type, acl_ids->z_mode, B_FALSE,
	trim, acl_ids->z_aclp);
	}
	}

	if (inherited \|\| vsecp) {
	acl_ids->z_mode = zfs_mode_compute(acl_ids->z_mode,
	acl_ids->z_aclp, &acl_ids->z_aclp->z_hints,
	acl_ids->z_fuid, acl_ids->z_fgid);
	if (ace_trivial_common(acl_ids->z_aclp, 0, zfs_ace_walk) == 0)
	acl_ids->z_aclp->z_hints \|= ZFS_ACL_TRIVIAL;
	}

	return (0);
	}

	/*
	* Free ACL and fuid_infop, but not the acl_ids structure
	*/
	void
	zfs_acl_ids_free(zfs_acl_ids_t *acl_ids)
	{
	if (acl_ids->z_aclp)
	zfs_acl_free(acl_ids->z_aclp);
	if (acl_ids->z_fuidp)
	zfs_fuid_info_free(acl_ids->z_fuidp);
	acl_ids->z_aclp = NULL;
	acl_ids->z_fuidp = NULL;
	}

	boolean_t
	zfs_acl_ids_overquota(zfsvfs_t zv, zfs_acl_ids_t acl_ids, uint64_t projid)
	{
	return (zfs_id_overquota(zv, DMU_USERUSED_OBJECT, acl_ids->z_fuid) \|\|
	zfs_id_overquota(zv, DMU_GROUPUSED_OBJECT, acl_ids->z_fgid) \|\|
	(projid != ZFS_DEFAULT_PROJID && projid != ZFS_INVALID_PROJID &&
	zfs_id_overquota(zv, DMU_PROJECTUSED_OBJECT, projid)));
	}

	/*
	* Retrieve a file's ACL
	*/
	int
	zfs_getacl(znode_t zp, vsecattr_t vsecp, boolean_t skipaclchk, cred_t *cr)
	{
	zfs_acl_t *aclp;
	ulong_t mask;
	int error;
	int count = 0;
	int largeace = 0;

	mask = vsecp->vsa_mask & (VSA_ACE \| VSA_ACECNT \|
	VSA_ACE_ACLFLAGS \| VSA_ACE_ALLTYPES);

	if (mask == 0)
	return (SET_ERROR(ENOSYS));

	if ((error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)))
	return (error);

	mutex_enter(&zp->z_acl_lock);

	if (zp->z_zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_LOCKED(ZTOV(zp), __func__);
	error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE);
	if (error != 0) {
	mutex_exit(&zp->z_acl_lock);
	return (error);
	}

	/*
	* Scan ACL to determine number of ACEs
	*/
	if ((zp->z_pflags & ZFS_ACL_OBJ_ACE) && !(mask & VSA_ACE_ALLTYPES)) {
	void *zacep = NULL;
	uint64_t who;
	uint32_t access_mask;
	uint16_t type, iflags;

	while ((zacep = zfs_acl_next_ace(aclp, zacep,
	&who, &access_mask, &iflags, &type))) {
	switch (type) {
	case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
	case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
	case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
	largeace++;
	continue;
	default:
	count++;
	}
	}
	vsecp->vsa_aclcnt = count;
	} else
	count = (int)aclp->z_acl_count;

	if (mask & VSA_ACECNT) {
	vsecp->vsa_aclcnt = count;
	}

	if (mask & VSA_ACE) {
	size_t aclsz;

	aclsz = count * sizeof (ace_t) +
	sizeof (ace_object_t) * largeace;

	vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP);
	vsecp->vsa_aclentsz = aclsz;

	if (aclp->z_version == ZFS_ACL_VERSION_FUID)
	zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, cr,
	vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES));
	else {
	zfs_acl_node_t *aclnode;
	void *start = vsecp->vsa_aclentp;

	for (aclnode = list_head(&aclp->z_acl); aclnode;
	aclnode = list_next(&aclp->z_acl, aclnode)) {
	bcopy(aclnode->z_acldata, start,
	aclnode->z_size);
	start = (caddr_t)start + aclnode->z_size;
	}
	- ASSERT((caddr_t)start - (caddr_t)vsecp->vsa_aclentp ==
	- aclp->z_acl_bytes);
	+ ASSERT3U((caddr_t)start - (caddr_t)vsecp->vsa_aclentp,
	+ ==, aclp->z_acl_bytes);
	}
	}
	if (mask & VSA_ACE_ACLFLAGS) {
	vsecp->vsa_aclflags = 0;
	if (zp->z_pflags & ZFS_ACL_DEFAULTED)
	vsecp->vsa_aclflags \|= ACL_DEFAULTED;
	if (zp->z_pflags & ZFS_ACL_PROTECTED)
	vsecp->vsa_aclflags \|= ACL_PROTECTED;
	if (zp->z_pflags & ZFS_ACL_AUTO_INHERIT)
	vsecp->vsa_aclflags \|= ACL_AUTO_INHERIT;
	}

	mutex_exit(&zp->z_acl_lock);

	return (0);
	}

	int
	zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, umode_t obj_type,
	vsecattr_t vsecp, cred_t cr, zfs_fuid_info_t fuidp, zfs_acl_t zaclp)
	{
	zfs_acl_t *aclp;
	zfs_acl_node_t *aclnode;
	int aclcnt = vsecp->vsa_aclcnt;
	int error;

	if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES \|\| vsecp->vsa_aclcnt <= 0)
	return (SET_ERROR(EINVAL));

	aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version));

	aclp->z_hints = 0;
	aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t));
	if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
	if ((error = zfs_copy_ace_2_oldace(obj_type, aclp,
	(ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata,
	aclcnt, &aclnode->z_size)) != 0) {
	zfs_acl_free(aclp);
	zfs_acl_node_free(aclnode);
	return (error);
	}
	} else {
	if ((error = zfs_copy_ace_2_fuid(zfsvfs, obj_type, aclp,
	vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt,
	&aclnode->z_size, fuidp, cr)) != 0) {
	zfs_acl_free(aclp);
	zfs_acl_node_free(aclnode);
	return (error);
	}
	}
	aclp->z_acl_bytes = aclnode->z_size;
	aclnode->z_ace_count = aclcnt;
	aclp->z_acl_count = aclcnt;
	list_insert_head(&aclp->z_acl, aclnode);

	/*
	* If flags are being set then add them to z_hints
	*/
	if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) {
	if (vsecp->vsa_aclflags & ACL_PROTECTED)
	aclp->z_hints \|= ZFS_ACL_PROTECTED;
	if (vsecp->vsa_aclflags & ACL_DEFAULTED)
	aclp->z_hints \|= ZFS_ACL_DEFAULTED;
	if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT)
	aclp->z_hints \|= ZFS_ACL_AUTO_INHERIT;
	}

	*zaclp = aclp;

	return (0);
	}

	/*
	* Set a file's ACL
	*/
	int
	zfs_setacl(znode_t zp, vsecattr_t vsecp, boolean_t skipaclchk, cred_t *cr)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	zilog_t *zilog = zfsvfs->z_log;
	ulong_t mask = vsecp->vsa_mask & (VSA_ACE \| VSA_ACECNT);
	dmu_tx_t *tx;
	int error;
	zfs_acl_t *aclp;
	zfs_fuid_info_t *fuidp = NULL;
	boolean_t fuid_dirtied;
	uint64_t acl_obj;

	if (zp->z_zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
	if (mask == 0)
	return (SET_ERROR(ENOSYS));

	if (zp->z_pflags & ZFS_IMMUTABLE)
	return (SET_ERROR(EPERM));

	if ((error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)))
	return (error);

	error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, cr, &fuidp,
	&aclp);
	if (error)
	return (error);

	/*
	* If ACL wide flags aren't being set then preserve any
	* existing flags.
	*/
	if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) {
	aclp->z_hints \|=
	(zp->z_pflags & V4_ACL_WIDE_FLAGS);
	}
	top:
	mutex_enter(&zp->z_acl_lock);

	tx = dmu_tx_create(zfsvfs->z_os);

	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);

	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);

	/*
	* If old version and ACL won't fit in bonus and we aren't
	* upgrading then take out necessary DMU holds
	*/

	if ((acl_obj = zfs_external_acl(zp)) != 0) {
	if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
	zfs_znode_acl_version(zp) <= ZFS_ACL_VERSION_INITIAL) {
	dmu_tx_hold_free(tx, acl_obj, 0,
	DMU_OBJECT_END);
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
	aclp->z_acl_bytes);
	} else {
	dmu_tx_hold_write(tx, acl_obj, 0, aclp->z_acl_bytes);
	}
	} else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes);
	}

	zfs_sa_upgrade_txholds(tx, zp);
	error = dmu_tx_assign(tx, TXG_NOWAIT);
	if (error) {
	mutex_exit(&zp->z_acl_lock);

	if (error == ERESTART) {
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	goto top;
	}
	dmu_tx_abort(tx);
	zfs_acl_free(aclp);
	return (error);
	}

	error = zfs_aclset_common(zp, aclp, cr, tx);
	- ASSERT(error == 0);
	- ASSERT(zp->z_acl_cached == NULL);
	+ ASSERT0(error);
	+ ASSERT3P(zp->z_acl_cached, ==, NULL);
	zp->z_acl_cached = aclp;

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	zfs_log_acl(zilog, tx, zp, vsecp, fuidp);

	if (fuidp)
	zfs_fuid_info_free(fuidp);
	dmu_tx_commit(tx);
	mutex_exit(&zp->z_acl_lock);

	return (error);
	}

	/*
	* Check accesses of interest (AoI) against attributes of the dataset
	* such as read-only. Returns zero if no AoI conflict with dataset
	* attributes, otherwise an appropriate errno is returned.
	*/
	static int
	zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode)
	{
	if ((v4_mode & WRITE_MASK) &&
	(zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) &&
	(!IS_DEVVP(ZTOV(zp)) \|\|
	(IS_DEVVP(ZTOV(zp)) && (v4_mode & WRITE_MASK_ATTRS)))) {
	return (SET_ERROR(EROFS));
	}

	/*
	* Intentionally allow ZFS_READONLY through here.
	* See zfs_zaccess_common().
	*/
	if ((v4_mode & WRITE_MASK_DATA) &&
	(zp->z_pflags & ZFS_IMMUTABLE)) {
	return (SET_ERROR(EPERM));
	}

	/*
	* In FreeBSD we allow to modify directory's content is ZFS_NOUNLINK
	* (sunlnk) is set. We just don't allow directory removal, which is
	* handled in zfs_zaccess_delete().
	*/
	if ((v4_mode & ACE_DELETE) &&
	(zp->z_pflags & ZFS_NOUNLINK)) {
	return (EPERM);
	}

	if (((v4_mode & (ACE_READ_DATA\|ACE_EXECUTE)) &&
	(zp->z_pflags & ZFS_AV_QUARANTINED))) {
	return (SET_ERROR(EACCES));
	}

	return (0);
	}

	/*
	* The primary usage of this function is to loop through all of the
	* ACEs in the znode, determining what accesses of interest (AoI) to
	* the caller are allowed or denied. The AoI are expressed as bits in
	* the working_mode parameter. As each ACE is processed, bits covered
	* by that ACE are removed from the working_mode. This removal
	* facilitates two things. The first is that when the working mode is
	* empty (= 0), we know we've looked at all the AoI. The second is
	* that the ACE interpretation rules don't allow a later ACE to undo
	* something granted or denied by an earlier ACE. Removing the
	* discovered access or denial enforces this rule. At the end of
	* processing the ACEs, all AoI that were found to be denied are
	* placed into the working_mode, giving the caller a mask of denied
	* accesses. Returns:
	* 0 if all AoI granted
	* EACCESS if the denied mask is non-zero
	* other error if abnormal failure (e.g., IO error)
	*
	* A secondary usage of the function is to determine if any of the
	* AoI are granted. If an ACE grants any access in
	* the working_mode, we immediately short circuit out of the function.
	* This mode is chosen by setting anyaccess to B_TRUE. The
	* working_mode is not a denied access mask upon exit if the function
	* is used in this manner.
	*/
	static int
	zfs_zaccess_aces_check(znode_t zp, uint32_t working_mode,
	boolean_t anyaccess, cred_t *cr)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	zfs_acl_t *aclp;
	int error;
	uid_t uid = crgetuid(cr);
	uint64_t who;
	uint16_t type, iflags;
	uint16_t entry_type;
	uint32_t access_mask;
	uint32_t deny_mask = 0;
	zfs_ace_hdr_t *acep = NULL;
	boolean_t checkit;
	uid_t gowner;
	uid_t fowner;

	zfs_fuid_map_ids(zp, cr, &fowner, &gowner);

	mutex_enter(&zp->z_acl_lock);

	if (zp->z_zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_LOCKED(ZTOV(zp), __func__);
	error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE);
	if (error != 0) {
	mutex_exit(&zp->z_acl_lock);
	return (error);
	}

	- ASSERT(zp->z_acl_cached);
	+ ASSERT3P(zp->z_acl_cached, !=, NULL);

	while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
	&iflags, &type))) {
	uint32_t mask_matched;

	if (!zfs_acl_valid_ace_type(type, iflags))
	continue;

	if (ZTOV(zp)->v_type == VDIR && (iflags & ACE_INHERIT_ONLY_ACE))
	continue;

	/* Skip ACE if it does not affect any AoI */
	mask_matched = (access_mask & *working_mode);
	if (!mask_matched)
	continue;

	entry_type = (iflags & ACE_TYPE_FLAGS);

	checkit = B_FALSE;

	switch (entry_type) {
	case ACE_OWNER:
	if (uid == fowner)
	checkit = B_TRUE;
	break;
	case OWNING_GROUP:
	who = gowner;
	/FALLTHROUGH/
	case ACE_IDENTIFIER_GROUP:
	checkit = zfs_groupmember(zfsvfs, who, cr);
	break;
	case ACE_EVERYONE:
	checkit = B_TRUE;
	break;

	/* USER Entry */
	default:
	if (entry_type == 0) {
	uid_t newid;

	newid = zfs_fuid_map_id(zfsvfs, who, cr,
	ZFS_ACE_USER);
	if (newid != UID_NOBODY &&
	uid == newid)
	checkit = B_TRUE;
	break;
	} else {
	mutex_exit(&zp->z_acl_lock);
	return (SET_ERROR(EIO));
	}
	}

	if (checkit) {
	if (type == DENY) {
	DTRACE_PROBE3(zfs__ace__denies,
	znode_t *, zp,
	zfs_ace_hdr_t *, acep,
	uint32_t, mask_matched);
	deny_mask \|= mask_matched;
	} else {
	DTRACE_PROBE3(zfs__ace__allows,
	znode_t *, zp,
	zfs_ace_hdr_t *, acep,
	uint32_t, mask_matched);
	if (anyaccess) {
	mutex_exit(&zp->z_acl_lock);
	return (0);
	}
	}
	*working_mode &= ~mask_matched;
	}

	/* Are we done? */
	if (*working_mode == 0)
	break;
	}

	mutex_exit(&zp->z_acl_lock);

	/* Put the found 'denies' back on the working mode */
	if (deny_mask) {
	*working_mode \|= deny_mask;
	return (SET_ERROR(EACCES));
	} else if (*working_mode) {
	return (-1);
	}

	return (0);
	}

	/*
	* Return true if any access whatsoever granted, we don't actually
	* care what access is granted.
	*/
	boolean_t
	zfs_has_access(znode_t zp, cred_t cr)
	{
	uint32_t have = ACE_ALL_PERMS;

	if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr) != 0) {
	uid_t owner;

	owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
	return (secpolicy_vnode_any_access(cr, ZTOV(zp), owner) == 0);
	}
	return (B_TRUE);
	}

	static int
	zfs_zaccess_common(znode_t zp, uint32_t v4_mode, uint32_t working_mode,
	boolean_t check_privs, boolean_t skipaclchk, cred_t cr)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	int err;

	*working_mode = v4_mode;
	*check_privs = B_TRUE;

	/*
	* Short circuit empty requests
	*/
	if (v4_mode == 0 \|\| zfsvfs->z_replay) {
	*working_mode = 0;
	return (0);
	}

	if ((err = zfs_zaccess_dataset_check(zp, v4_mode)) != 0) {
	*check_privs = B_FALSE;
	return (err);
	}

	/*
	* The caller requested that the ACL check be skipped. This
	* would only happen if the caller checked VOP_ACCESS() with a
	* 32 bit ACE mask and already had the appropriate permissions.
	*/
	if (skipaclchk) {
	*working_mode = 0;
	return (0);
	}

	/*
	* Note: ZFS_READONLY represents the "DOS R/O" attribute.
	* When that flag is set, we should behave as if write access
	* were not granted by anything in the ACL. In particular:
	* We _must_ allow writes after opening the file r/w, then
	* setting the DOS R/O attribute, and writing some more.
	* (Similar to how you can write after fchmod(fd, 0444).)
	*
	* Therefore ZFS_READONLY is ignored in the dataset check
	* above, and checked here as if part of the ACL check.
	* Also note: DOS R/O is ignored for directories.
	*/
	if ((v4_mode & WRITE_MASK_DATA) &&
	(ZTOV(zp)->v_type != VDIR) &&
	(zp->z_pflags & ZFS_READONLY)) {
	return (SET_ERROR(EPERM));
	}

	return (zfs_zaccess_aces_check(zp, working_mode, B_FALSE, cr));
	}

	static int
	zfs_zaccess_append(znode_t zp, uint32_t working_mode, boolean_t *check_privs,
	cred_t *cr)
	{
	if (*working_mode != ACE_WRITE_DATA)
	return (SET_ERROR(EACCES));

	return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode,
	check_privs, B_FALSE, cr));
	}

	/*
	* Check if VEXEC is allowed.
	*
	* This routine is based on zfs_fastaccesschk_execute which has slowpath
	* calling zfs_zaccess. This would be incorrect on FreeBSD (see
	* zfs_freebsd_access for the difference). Thus this variant let's the
	* caller handle the slowpath (if necessary).
	*
	* On top of that we perform a lockless check for ZFS_NO_EXECS_DENIED.
	*
	* Safe access to znode_t is provided by the vnode lock.
	*/
	int
	zfs_fastaccesschk_execute(znode_t zdp, cred_t cr)
	{
	boolean_t is_attr;

	if (zdp->z_pflags & ZFS_AV_QUARANTINED)
	return (1);

	is_attr = ((zdp->z_pflags & ZFS_XATTR) &&
	(ZTOV(zdp)->v_type == VDIR));
	if (is_attr)
	return (1);

	if (zdp->z_pflags & ZFS_NO_EXECS_DENIED)
	return (0);

	return (1);
	}


	/*
	* Determine whether Access should be granted/denied.
	*
	* The least priv subsystem is always consulted as a basic privilege
	* can define any form of access.
	*/
	int
	zfs_zaccess(znode_t zp, int mode, int flags, boolean_t skipaclchk, cred_t cr)
	{
	uint32_t working_mode;
	int error;
	int is_attr;
	boolean_t check_privs;
	znode_t *xzp = NULL;
	znode_t *check_zp = zp;
	mode_t needed_bits;
	uid_t owner;

	is_attr = ((zp->z_pflags & ZFS_XATTR) && (ZTOV(zp)->v_type == VDIR));

	/*
	* In FreeBSD, we don't care about permissions of individual ADS.
	* Note that not checking them is not just an optimization - without
	* this shortcut, EA operations may bogusly fail with EACCES.
	*/
	if (zp->z_pflags & ZFS_XATTR)
	return (0);

	owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);

	/*
	* Map the bits required to the standard vnode flags VREAD\|VWRITE\|VEXEC
	* in needed_bits. Map the bits mapped by working_mode (currently
	* missing) in missing_bits.
	* Call secpolicy_vnode_access2() with (needed_bits & ~checkmode),
	* needed_bits.
	*/
	needed_bits = 0;

	working_mode = mode;
	if ((working_mode & (ACE_READ_ACL\|ACE_READ_ATTRIBUTES)) &&
	owner == crgetuid(cr))
	working_mode &= ~(ACE_READ_ACL\|ACE_READ_ATTRIBUTES);

	if (working_mode & (ACE_READ_DATA\|ACE_READ_NAMED_ATTRS\|
	ACE_READ_ACL\|ACE_READ_ATTRIBUTES\|ACE_SYNCHRONIZE))
	needed_bits \|= VREAD;
	if (working_mode & (ACE_WRITE_DATA\|ACE_WRITE_NAMED_ATTRS\|
	ACE_APPEND_DATA\|ACE_WRITE_ATTRIBUTES\|ACE_SYNCHRONIZE))
	needed_bits \|= VWRITE;
	if (working_mode & ACE_EXECUTE)
	needed_bits \|= VEXEC;

	if ((error = zfs_zaccess_common(check_zp, mode, &working_mode,
	&check_privs, skipaclchk, cr)) == 0) {
	if (is_attr)
	VN_RELE(ZTOV(xzp));
	return (secpolicy_vnode_access2(cr, ZTOV(zp), owner,
	needed_bits, needed_bits));
	}

	if (error && !check_privs) {
	if (is_attr)
	VN_RELE(ZTOV(xzp));
	return (error);
	}

	if (error && (flags & V_APPEND)) {
	error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr);
	}

	if (error && check_privs) {
	mode_t checkmode = 0;
	vnode_t *check_vp = ZTOV(check_zp);

	/*
	* First check for implicit owner permission on
	* read_acl/read_attributes
	*/

	error = 0;
	- ASSERT(working_mode != 0);
	+ ASSERT3U(working_mode, !=, 0);

	if ((working_mode & (ACE_READ_ACL\|ACE_READ_ATTRIBUTES) &&
	owner == crgetuid(cr)))
	working_mode &= ~(ACE_READ_ACL\|ACE_READ_ATTRIBUTES);

	if (working_mode & (ACE_READ_DATA\|ACE_READ_NAMED_ATTRS\|
	ACE_READ_ACL\|ACE_READ_ATTRIBUTES\|ACE_SYNCHRONIZE))
	checkmode \|= VREAD;
	if (working_mode & (ACE_WRITE_DATA\|ACE_WRITE_NAMED_ATTRS\|
	ACE_APPEND_DATA\|ACE_WRITE_ATTRIBUTES\|ACE_SYNCHRONIZE))
	checkmode \|= VWRITE;
	if (working_mode & ACE_EXECUTE)
	checkmode \|= VEXEC;

	error = secpolicy_vnode_access2(cr, check_vp, owner,
	needed_bits & ~checkmode, needed_bits);

	if (error == 0 && (working_mode & ACE_WRITE_OWNER))
	error = secpolicy_vnode_chown(check_vp, cr, owner);
	if (error == 0 && (working_mode & ACE_WRITE_ACL))
	error = secpolicy_vnode_setdac(check_vp, cr, owner);

	if (error == 0 && (working_mode &
	(ACE_DELETE\|ACE_DELETE_CHILD)))
	error = secpolicy_vnode_remove(check_vp, cr);

	if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) {
	error = secpolicy_vnode_chown(check_vp, cr, owner);
	}
	if (error == 0) {
	/*
	* See if any bits other than those already checked
	* for are still present. If so then return EACCES
	*/
	if (working_mode & ~(ZFS_CHECKED_MASKS)) {
	error = SET_ERROR(EACCES);
	}
	}
	} else if (error == 0) {
	error = secpolicy_vnode_access2(cr, ZTOV(zp), owner,
	needed_bits, needed_bits);
	}


	if (is_attr)
	VN_RELE(ZTOV(xzp));

	return (error);
	}

	/*
	* Translate traditional unix VREAD/VWRITE/VEXEC mode into
	* NFSv4-style ZFS ACL format and call zfs_zaccess()
	*/
	int
	zfs_zaccess_rwx(znode_t zp, mode_t mode, int flags, cred_t cr)
	{
	return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr));
	}

	/*
	* Access function for secpolicy_vnode_setattr
	*/
	int
	zfs_zaccess_unix(znode_t zp, mode_t mode, cred_t cr)
	{
	int v4_mode = zfs_unix_to_v4(mode >> 6);

	return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr));
	}

	static int
	zfs_delete_final_check(znode_t zp, znode_t dzp,
	mode_t available_perms, cred_t *cr)
	{
	int error;
	uid_t downer;

	downer = zfs_fuid_map_id(dzp->z_zfsvfs, dzp->z_uid, cr, ZFS_OWNER);

	error = secpolicy_vnode_access2(cr, ZTOV(dzp),
	downer, available_perms, VWRITE\|VEXEC);

	if (error == 0)
	error = zfs_sticky_remove_access(dzp, zp, cr);

	return (error);
	}

	/*
	* Determine whether Access should be granted/deny, without
	* consulting least priv subsystem.
	*
	* The following chart is the recommended NFSv4 enforcement for
	* ability to delete an object.
	*
	* -------------------------------------------------------
	* \| Parent Dir \| Target Object Permissions \|
	* \| permissions \| \|
	* -------------------------------------------------------
	* \| \| ACL Allows \| ACL Denies\| Delete \|
	* \| \| Delete \| Delete \| unspecified\|
	* -------------------------------------------------------
	* \| ACL Allows \| Permit \| Permit \| Permit \|
	* \| DELETE_CHILD \| \|
	* -------------------------------------------------------
	* \| ACL Denies \| Permit \| Deny \| Deny \|
	* \| DELETE_CHILD \| \| \| \|
	* -------------------------------------------------------
	* \| ACL specifies \| \| \| \|
	* \| only allow \| Permit \| Permit \| Permit \|
	* \| write and \| \| \| \|
	* \| execute \| \| \| \|
	* -------------------------------------------------------
	* \| ACL denies \| \| \| \|
	* \| write and \| Permit \| Deny \| Deny \|
	* \| execute \| \| \| \|
	* -------------------------------------------------------
	* ^
	* \|
	* No search privilege, can't even look up file?
	*
	*/
	int
	zfs_zaccess_delete(znode_t dzp, znode_t zp, cred_t *cr)
	{
	uint32_t dzp_working_mode = 0;
	uint32_t zp_working_mode = 0;
	int dzp_error, zp_error;
	mode_t available_perms;
	boolean_t dzpcheck_privs = B_TRUE;
	boolean_t zpcheck_privs = B_TRUE;

	/*
	* We want specific DELETE permissions to
	* take precedence over WRITE/EXECUTE. We don't
	* want an ACL such as this to mess us up.
	* user:joe:write_data:deny,user:joe:delete:allow
	*
	* However, deny permissions may ultimately be overridden
	* by secpolicy_vnode_access().
	*
	* We will ask for all of the necessary permissions and then
	* look at the working modes from the directory and target object
	* to determine what was found.
	*/

	if (zp->z_pflags & (ZFS_IMMUTABLE \| ZFS_NOUNLINK))
	return (SET_ERROR(EPERM));

	/*
	* First row
	* If the directory permissions allow the delete, we are done.
	*/
	if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD,
	&dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0)
	return (0);

	/*
	* If target object has delete permission then we are done
	*/
	if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode,
	&zpcheck_privs, B_FALSE, cr)) == 0)
	return (0);

	- ASSERT(dzp_error && zp_error);
	+ ASSERT(dzp_error);
	+ ASSERT(zp_error);

	if (!dzpcheck_privs)
	return (dzp_error);
	if (!zpcheck_privs)
	return (zp_error);

	/*
	* Second row
	*
	* If directory returns EACCES then delete_child was denied
	* due to deny delete_child. In this case send the request through
	* secpolicy_vnode_remove(). We don't use zfs_delete_final_check()
	* since that could allow the delete based on write/execute permission
	* and we want delete permissions to override write/execute.
	*/

	if (dzp_error == EACCES) {
	/* XXXPJD: s/dzp/zp/ ? */
	return (secpolicy_vnode_remove(ZTOV(dzp), cr));
	}
	/*
	* Third Row
	* only need to see if we have write/execute on directory.
	*/

	dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE\|ACE_WRITE_DATA,
	&dzp_working_mode, &dzpcheck_privs, B_FALSE, cr);

	if (dzp_error != 0 && !dzpcheck_privs)
	return (dzp_error);

	/*
	* Fourth row
	*/

	available_perms = (dzp_working_mode & ACE_WRITE_DATA) ? 0 : VWRITE;
	available_perms \|= (dzp_working_mode & ACE_EXECUTE) ? 0 : VEXEC;

	return (zfs_delete_final_check(zp, dzp, available_perms, cr));

	}

	int
	zfs_zaccess_rename(znode_t sdzp, znode_t szp, znode_t *tdzp,
	znode_t tzp, cred_t cr)
	{
	int add_perm;
	int error;

	if (szp->z_pflags & ZFS_AV_QUARANTINED)
	return (SET_ERROR(EACCES));

	add_perm = (ZTOV(szp)->v_type == VDIR) ?
	ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE;

	/*
	* Rename permissions are combination of delete permission +
	* add file/subdir permission.
	*
	* BSD operating systems also require write permission
	* on the directory being moved from one parent directory
	* to another.
	*/
	if (ZTOV(szp)->v_type == VDIR && ZTOV(sdzp) != ZTOV(tdzp)) {
	if ((error = zfs_zaccess(szp, ACE_WRITE_DATA, 0, B_FALSE, cr)))
	return (error);
	}

	/*
	* first make sure we do the delete portion.
	*
	* If that succeeds then check for add_file/add_subdir permissions
	*/

	if ((error = zfs_zaccess_delete(sdzp, szp, cr)))
	return (error);

	/*
	* If we have a tzp, see if we can delete it?
	*/
	if (tzp && (error = zfs_zaccess_delete(tdzp, tzp, cr)))
	return (error);

	/*
	* Now check for add permissions
	*/
	error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr);

	return (error);
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_ctldir.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_ctldir.c
	index 3ab4502bbc25..a9fe1b647238 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_ctldir.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_ctldir.c
	@@ -1,1361 +1,1361 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
	* Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
	*/

	/*
	* ZFS control directory (a.k.a. ".zfs")
	*
	* This directory provides a common location for all ZFS meta-objects.
	* Currently, this is only the 'snapshot' directory, but this may expand in the
	* future. The elements are built using the GFS primitives, as the hierarchy
	* does not actually exist on disk.
	*
	* For 'snapshot', we don't want to have all snapshots always mounted, because
	* this would take up a huge amount of space in /etc/mnttab. We have three
	* types of objects:
	*
	* ctldir ------> snapshotdir -------> snapshot
	* \|
	* \|
	* V
	* mounted fs
	*
	* The 'snapshot' node contains just enough information to lookup '..' and act
	* as a mountpoint for the snapshot. Whenever we lookup a specific snapshot, we
	* perform an automount of the underlying filesystem and return the
	* corresponding vnode.
	*
	* All mounts are handled automatically by the kernel, but unmounts are
	* (currently) handled from user land. The main reason is that there is no
	* reliable way to auto-unmount the filesystem when it's "no longer in use".
	* When the user unmounts a filesystem, we call zfsctl_unmount(), which
	* unmounts any snapshots within the snapshot directory.
	*
	* The '.zfs', '.zfs/snapshot', and all directories created under
	* '.zfs/snapshot' (ie: '.zfs/snapshot/<snapname>') are all GFS nodes and
	* share the same vfs_t as the head filesystem (what '.zfs' lives under).
	*
	* File systems mounted ontop of the GFS nodes '.zfs/snapshot/<snapname>'
	* (ie: snapshots) are ZFS nodes and have their own unique vfs_t.
	* However, vnodes within these mounted on file systems have their v_vfsp
	* fields set to the head filesystem to make NFS happy (see
	* zfsctl_snapdir_lookup()). We VFS_HOLD the head filesystem's vfs_t
	* so that it cannot be freed until all snapshots have been unmounted.
	*/

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/libkern.h>
	#include <sys/dirent.h>
	#include <sys/zfs_context.h>
	#include <sys/zfs_ctldir.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/namei.h>
	#include <sys/stat.h>
	#include <sys/dmu.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_destroy.h>
	#include <sys/dsl_deleg.h>
	#include <sys/mount.h>
	#include <sys/zap.h>
	#include <sys/sysproto.h>

	#include "zfs_namecheck.h"

	#include <sys/kernel.h>
	#include <sys/ccompat.h>

	/* Common access mode for all virtual directories under the ctldir */
	const uint16_t zfsctl_ctldir_mode = S_IRUSR \| S_IXUSR \| S_IRGRP \| S_IXGRP \|
	S_IROTH \| S_IXOTH;

	/*
	* "Synthetic" filesystem implementation.
	*/

	/*
	* Assert that A implies B.
	*/
	#define KASSERT_IMPLY(A, B, msg) KASSERT(!(A) \|\| (B), (msg));

	static MALLOC_DEFINE(M_SFSNODES, "sfs_nodes", "synthetic-fs nodes");

	typedef struct sfs_node {
	char sn_name[ZFS_MAX_DATASET_NAME_LEN];
	uint64_t sn_parent_id;
	uint64_t sn_id;
	} sfs_node_t;

	/*
	* Check the parent's ID as well as the node's to account for a chance
	* that IDs originating from different domains (snapshot IDs, artificial
	* IDs, znode IDs) may clash.
	*/
	static int
	sfs_compare_ids(struct vnode vp, void arg)
	{
	sfs_node_t *n1 = vp->v_data;
	sfs_node_t *n2 = arg;
	bool equal;

	equal = n1->sn_id == n2->sn_id &&
	n1->sn_parent_id == n2->sn_parent_id;

	/* Zero means equality. */
	return (!equal);
	}

	static int
	sfs_vnode_get(const struct mount *mp, int flags, uint64_t parent_id,
	uint64_t id, struct vnode **vpp)
	{
	sfs_node_t search;
	int err;

	search.sn_id = id;
	search.sn_parent_id = parent_id;
	err = vfs_hash_get(mp, (uint32_t)id, flags, curthread, vpp,
	sfs_compare_ids, &search);
	return (err);
	}

	static int
	sfs_vnode_insert(struct vnode *vp, int flags, uint64_t parent_id,
	uint64_t id, struct vnode **vpp)
	{
	int err;

	KASSERT(vp->v_data != NULL, ("sfs_vnode_insert with NULL v_data"));
	err = vfs_hash_insert(vp, (uint32_t)id, flags, curthread, vpp,
	sfs_compare_ids, vp->v_data);
	return (err);
	}

	static void
	sfs_vnode_remove(struct vnode *vp)
	{
	vfs_hash_remove(vp);
	}

	typedef void sfs_vnode_setup_fn(vnode_t vp, void arg);

	static int
	sfs_vgetx(struct mount *mp, int flags, uint64_t parent_id, uint64_t id,
	const char tag, struct vop_vector vops,
	sfs_vnode_setup_fn setup, void *arg,
	struct vnode **vpp)
	{
	struct vnode *vp;
	int error;

	error = sfs_vnode_get(mp, flags, parent_id, id, vpp);
	if (error != 0 \|\| *vpp != NULL) {
	KASSERT_IMPLY(error == 0, (*vpp)->v_data != NULL,
	"sfs vnode with no data");
	return (error);
	}

	/* Allocate a new vnode/inode. */
	error = getnewvnode(tag, mp, vops, &vp);
	if (error != 0) {
	*vpp = NULL;
	return (error);
	}

	/*
	* Exclusively lock the vnode vnode while it's being constructed.
	*/
	lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
	error = insmntque(vp, mp);
	if (error != 0) {
	*vpp = NULL;
	return (error);
	}

	setup(vp, arg);

	error = sfs_vnode_insert(vp, flags, parent_id, id, vpp);
	if (error != 0 \|\| *vpp != NULL) {
	KASSERT_IMPLY(error == 0, (*vpp)->v_data != NULL,
	"sfs vnode with no data");
	return (error);
	}

	*vpp = vp;
	return (0);
	}

	static void
	sfs_print_node(sfs_node_t *node)
	{
	printf("\tname = %s\n", node->sn_name);
	printf("\tparent_id = %ju\n", (uintmax_t)node->sn_parent_id);
	printf("\tid = %ju\n", (uintmax_t)node->sn_id);
	}

	static sfs_node_t *
	sfs_alloc_node(size_t size, const char *name, uint64_t parent_id, uint64_t id)
	{
	struct sfs_node *node;

	KASSERT(strlen(name) < sizeof (node->sn_name),
	("sfs node name is too long"));
	KASSERT(size >= sizeof (*node), ("sfs node size is too small"));
	node = malloc(size, M_SFSNODES, M_WAITOK \| M_ZERO);
	strlcpy(node->sn_name, name, sizeof (node->sn_name));
	node->sn_parent_id = parent_id;
	node->sn_id = id;

	return (node);
	}

	static void
	sfs_destroy_node(sfs_node_t *node)
	{
	free(node, M_SFSNODES);
	}

	static void *
	sfs_reclaim_vnode(vnode_t *vp)
	{
	void *data;

	sfs_vnode_remove(vp);
	data = vp->v_data;
	vp->v_data = NULL;
	return (data);
	}

	static int
	sfs_readdir_common(uint64_t parent_id, uint64_t id, struct vop_readdir_args *ap,
	zfs_uio_t uio, off_t offp)
	{
	struct dirent entry;
	int error;

	/* Reset ncookies for subsequent use of vfs_read_dirent. */
	if (ap->a_ncookies != NULL)
	*ap->a_ncookies = 0;

	if (zfs_uio_resid(uio) < sizeof (entry))
	return (SET_ERROR(EINVAL));

	if (zfs_uio_offset(uio) < 0)
	return (SET_ERROR(EINVAL));
	if (zfs_uio_offset(uio) == 0) {
	entry.d_fileno = id;
	entry.d_type = DT_DIR;
	entry.d_name[0] = '.';
	entry.d_name[1] = '\0';
	entry.d_namlen = 1;
	entry.d_reclen = sizeof (entry);
	error = vfs_read_dirent(ap, &entry, zfs_uio_offset(uio));
	if (error != 0)
	return (SET_ERROR(error));
	}

	if (zfs_uio_offset(uio) < sizeof (entry))
	return (SET_ERROR(EINVAL));
	if (zfs_uio_offset(uio) == sizeof (entry)) {
	entry.d_fileno = parent_id;
	entry.d_type = DT_DIR;
	entry.d_name[0] = '.';
	entry.d_name[1] = '.';
	entry.d_name[2] = '\0';
	entry.d_namlen = 2;
	entry.d_reclen = sizeof (entry);
	error = vfs_read_dirent(ap, &entry, zfs_uio_offset(uio));
	if (error != 0)
	return (SET_ERROR(error));
	}

	if (offp != NULL)
	offp = 2 sizeof (entry);
	return (0);
	}


	/*
	* .zfs inode namespace
	*
	* We need to generate unique inode numbers for all files and directories
	* within the .zfs pseudo-filesystem. We use the following scheme:
	*
	* ENTRY ZFSCTL_INODE
	* .zfs 1
	* .zfs/snapshot 2
	* .zfs/snapshot/<snap> objectid(snap)
	*/
	#define ZFSCTL_INO_SNAP(id) (id)

	static struct vop_vector zfsctl_ops_root;
	static struct vop_vector zfsctl_ops_snapdir;
	static struct vop_vector zfsctl_ops_snapshot;

	void
	zfsctl_init(void)
	{
	}

	void
	zfsctl_fini(void)
	{
	}

	boolean_t
	zfsctl_is_node(vnode_t *vp)
	{
	return (vn_matchops(vp, zfsctl_ops_root) \|\|
	vn_matchops(vp, zfsctl_ops_snapdir) \|\|
	vn_matchops(vp, zfsctl_ops_snapshot));

	}

	typedef struct zfsctl_root {
	sfs_node_t node;
	sfs_node_t *snapdir;
	timestruc_t cmtime;
	} zfsctl_root_t;


	/*
	* Create the '.zfs' directory.
	*/
	void
	zfsctl_create(zfsvfs_t *zfsvfs)
	{
	zfsctl_root_t *dot_zfs;
	sfs_node_t *snapdir;
	vnode_t *rvp;
	uint64_t crtime[2];

	- ASSERT(zfsvfs->z_ctldir == NULL);
	+ ASSERT3P(zfsvfs->z_ctldir, ==, NULL);

	snapdir = sfs_alloc_node(sizeof (*snapdir), "snapshot", ZFSCTL_INO_ROOT,
	ZFSCTL_INO_SNAPDIR);
	dot_zfs = (zfsctl_root_t )sfs_alloc_node(sizeof (dot_zfs), ".zfs", 0,
	ZFSCTL_INO_ROOT);
	dot_zfs->snapdir = snapdir;

	- VERIFY(VFS_ROOT(zfsvfs->z_vfs, LK_EXCLUSIVE, &rvp) == 0);
	- VERIFY(0 == sa_lookup(VTOZ(rvp)->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
	+ VERIFY0(VFS_ROOT(zfsvfs->z_vfs, LK_EXCLUSIVE, &rvp));
	+ VERIFY0(sa_lookup(VTOZ(rvp)->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
	&crtime, sizeof (crtime)));
	ZFS_TIME_DECODE(&dot_zfs->cmtime, crtime);
	vput(rvp);

	zfsvfs->z_ctldir = dot_zfs;
	}

	/*
	* Destroy the '.zfs' directory. Only called when the filesystem is unmounted.
	* The nodes must not have any associated vnodes by now as they should be
	* vflush-ed.
	*/
	void
	zfsctl_destroy(zfsvfs_t *zfsvfs)
	{
	sfs_destroy_node(zfsvfs->z_ctldir->snapdir);
	sfs_destroy_node((sfs_node_t *)zfsvfs->z_ctldir);
	zfsvfs->z_ctldir = NULL;
	}

	static int
	zfsctl_fs_root_vnode(struct mount mp, void arg __unused, int flags,
	struct vnode **vpp)
	{
	return (VFS_ROOT(mp, flags, vpp));
	}

	static void
	zfsctl_common_vnode_setup(vnode_t vp, void arg)
	{
	ASSERT_VOP_ELOCKED(vp, __func__);

	/* We support shared locking. */
	VN_LOCK_ASHARE(vp);
	vp->v_type = VDIR;
	vp->v_data = arg;
	}

	static int
	zfsctl_root_vnode(struct mount mp, void arg __unused, int flags,
	struct vnode **vpp)
	{
	void *node;
	int err;

	node = ((zfsvfs_t *)mp->mnt_data)->z_ctldir;
	err = sfs_vgetx(mp, flags, 0, ZFSCTL_INO_ROOT, "zfs", &zfsctl_ops_root,
	zfsctl_common_vnode_setup, node, vpp);
	return (err);
	}

	static int
	zfsctl_snapdir_vnode(struct mount mp, void arg __unused, int flags,
	struct vnode **vpp)
	{
	void *node;
	int err;

	node = ((zfsvfs_t *)mp->mnt_data)->z_ctldir->snapdir;
	err = sfs_vgetx(mp, flags, ZFSCTL_INO_ROOT, ZFSCTL_INO_SNAPDIR, "zfs",
	&zfsctl_ops_snapdir, zfsctl_common_vnode_setup, node, vpp);
	return (err);
	}

	/*
	* Given a root znode, retrieve the associated .zfs directory.
	* Add a hold to the vnode and return it.
	*/
	int
	zfsctl_root(zfsvfs_t zfsvfs, int flags, vnode_t *vpp)
	{
	int error;

	error = zfsctl_root_vnode(zfsvfs->z_vfs, NULL, flags, vpp);
	return (error);
	}

	/*
	* Common open routine. Disallow any write access.
	*/
	static int
	zfsctl_common_open(struct vop_open_args *ap)
	{
	int flags = ap->a_mode;

	if (flags & FWRITE)
	return (SET_ERROR(EACCES));

	return (0);
	}

	/*
	* Common close routine. Nothing to do here.
	*/
	/* ARGSUSED */
	static int
	zfsctl_common_close(struct vop_close_args *ap)
	{
	return (0);
	}

	/*
	* Common access routine. Disallow writes.
	*/
	static int
	zfsctl_common_access(struct vop_access_args *ap)
	{
	accmode_t accmode = ap->a_accmode;

	if (accmode & VWRITE)
	return (SET_ERROR(EACCES));
	return (0);
	}

	/*
	* Common getattr function. Fill in basic information.
	*/
	static void
	zfsctl_common_getattr(vnode_t vp, vattr_t vap)
	{
	timestruc_t now;
	sfs_node_t *node;

	node = vp->v_data;

	vap->va_uid = 0;
	vap->va_gid = 0;
	vap->va_rdev = 0;
	/*
	* We are a purely virtual object, so we have no
	* blocksize or allocated blocks.
	*/
	vap->va_blksize = 0;
	vap->va_nblocks = 0;
	vap->va_seq = 0;
	vn_fsid(vp, vap);
	vap->va_mode = zfsctl_ctldir_mode;
	vap->va_type = VDIR;
	/*
	* We live in the now (for atime).
	*/
	gethrestime(&now);
	vap->va_atime = now;
	/* FreeBSD: Reset chflags(2) flags. */
	vap->va_flags = 0;

	vap->va_nodeid = node->sn_id;

	/* At least '.' and '..'. */
	vap->va_nlink = 2;
	}

	#ifndef _OPENSOLARIS_SYS_VNODE_H_
	struct vop_fid_args {
	struct vnode *a_vp;
	struct fid *a_fid;
	};
	#endif

	static int
	zfsctl_common_fid(struct vop_fid_args *ap)
	{
	vnode_t *vp = ap->a_vp;
	fid_t fidp = (void )ap->a_fid;
	sfs_node_t *node = vp->v_data;
	uint64_t object = node->sn_id;
	zfid_short_t *zfid;
	int i;

	zfid = (zfid_short_t *)fidp;
	zfid->zf_len = SHORT_FID_LEN;

	for (i = 0; i < sizeof (zfid->zf_object); i++)
	zfid->zf_object[i] = (uint8_t)(object >> (8 * i));

	/* .zfs nodes always have a generation number of 0 */
	for (i = 0; i < sizeof (zfid->zf_gen); i++)
	zfid->zf_gen[i] = 0;

	return (0);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_reclaim_args {
	struct vnode *a_vp;
	struct thread *a_td;
	};
	#endif

	static int
	zfsctl_common_reclaim(struct vop_reclaim_args *ap)
	{
	vnode_t *vp = ap->a_vp;

	(void) sfs_reclaim_vnode(vp);
	return (0);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_print_args {
	struct vnode *a_vp;
	};
	#endif

	static int
	zfsctl_common_print(struct vop_print_args *ap)
	{
	sfs_print_node(ap->a_vp->v_data);
	return (0);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_getattr_args {
	struct vnode *a_vp;
	struct vattr *a_vap;
	struct ucred *a_cred;
	};
	#endif

	/*
	* Get root directory attributes.
	*/
	static int
	zfsctl_root_getattr(struct vop_getattr_args *ap)
	{
	struct vnode *vp = ap->a_vp;
	struct vattr *vap = ap->a_vap;
	zfsctl_root_t *node = vp->v_data;

	zfsctl_common_getattr(vp, vap);
	vap->va_ctime = node->cmtime;
	vap->va_mtime = vap->va_ctime;
	vap->va_birthtime = vap->va_ctime;
	vap->va_nlink += 1; /* snapdir */
	vap->va_size = vap->va_nlink;
	return (0);
	}

	/*
	* When we lookup "." we still can be asked to lock it
	* differently, can't we?
	*/
	static int
	zfsctl_relock_dot(vnode_t *dvp, int ltype)
	{
	vref(dvp);
	if (ltype != VOP_ISLOCKED(dvp)) {
	if (ltype == LK_EXCLUSIVE)
	vn_lock(dvp, LK_UPGRADE \| LK_RETRY);
	else /* if (ltype == LK_SHARED) */
	vn_lock(dvp, LK_DOWNGRADE \| LK_RETRY);

	/* Relock for the "." case may left us with reclaimed vnode. */
	if (VN_IS_DOOMED(dvp)) {
	vrele(dvp);
	return (SET_ERROR(ENOENT));
	}
	}
	return (0);
	}

	/*
	* Special case the handling of "..".
	*/
	static int
	zfsctl_root_lookup(struct vop_lookup_args *ap)
	{
	struct componentname *cnp = ap->a_cnp;
	vnode_t *dvp = ap->a_dvp;
	vnode_t **vpp = ap->a_vpp;
	int flags = ap->a_cnp->cn_flags;
	int lkflags = ap->a_cnp->cn_lkflags;
	int nameiop = ap->a_cnp->cn_nameiop;
	int err;

	- ASSERT(dvp->v_type == VDIR);
	+ ASSERT3S(dvp->v_type, ==, VDIR);

	if ((flags & ISLASTCN) != 0 && nameiop != LOOKUP)
	return (SET_ERROR(ENOTSUP));

	if (cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.') {
	err = zfsctl_relock_dot(dvp, lkflags & LK_TYPE_MASK);
	if (err == 0)
	*vpp = dvp;
	} else if ((flags & ISDOTDOT) != 0) {
	err = vn_vget_ino_gen(dvp, zfsctl_fs_root_vnode, NULL,
	lkflags, vpp);
	} else if (strncmp(cnp->cn_nameptr, "snapshot", cnp->cn_namelen) == 0) {
	err = zfsctl_snapdir_vnode(dvp->v_mount, NULL, lkflags, vpp);
	} else {
	err = SET_ERROR(ENOENT);
	}
	if (err != 0)
	*vpp = NULL;
	return (err);
	}

	static int
	zfsctl_root_readdir(struct vop_readdir_args *ap)
	{
	struct dirent entry;
	vnode_t *vp = ap->a_vp;
	zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
	zfsctl_root_t *node = vp->v_data;
	zfs_uio_t uio;
	int *eofp = ap->a_eofflag;
	off_t dots_offset;
	int error;

	zfs_uio_init(&uio, ap->a_uio);

	- ASSERT(vp->v_type == VDIR);
	+ ASSERT3S(vp->v_type, ==, VDIR);

	error = sfs_readdir_common(zfsvfs->z_root, ZFSCTL_INO_ROOT, ap, &uio,
	&dots_offset);
	if (error != 0) {
	if (error == ENAMETOOLONG) /* ran out of destination space */
	error = 0;
	return (error);
	}
	if (zfs_uio_offset(&uio) != dots_offset)
	return (SET_ERROR(EINVAL));

	CTASSERT(sizeof (node->snapdir->sn_name) <= sizeof (entry.d_name));
	entry.d_fileno = node->snapdir->sn_id;
	entry.d_type = DT_DIR;
	strcpy(entry.d_name, node->snapdir->sn_name);
	entry.d_namlen = strlen(entry.d_name);
	entry.d_reclen = sizeof (entry);
	error = vfs_read_dirent(ap, &entry, zfs_uio_offset(&uio));
	if (error != 0) {
	if (error == ENAMETOOLONG)
	error = 0;
	return (SET_ERROR(error));
	}
	if (eofp != NULL)
	*eofp = 1;
	return (0);
	}

	static int
	zfsctl_root_vptocnp(struct vop_vptocnp_args *ap)
	{
	static const char dotzfs_name[4] = ".zfs";
	vnode_t *dvp;
	int error;

	if (*ap->a_buflen < sizeof (dotzfs_name))
	return (SET_ERROR(ENOMEM));

	error = vn_vget_ino_gen(ap->a_vp, zfsctl_fs_root_vnode, NULL,
	LK_SHARED, &dvp);
	if (error != 0)
	return (SET_ERROR(error));

	VOP_UNLOCK1(dvp);
	*ap->a_vpp = dvp;
	*ap->a_buflen -= sizeof (dotzfs_name);
	bcopy(dotzfs_name, ap->a_buf + *ap->a_buflen, sizeof (dotzfs_name));
	return (0);
	}

	static int
	zfsctl_common_pathconf(struct vop_pathconf_args *ap)
	{
	/*
	* We care about ACL variables so that user land utilities like ls
	* can display them correctly. Since the ctldir's st_dev is set to be
	* the same as the parent dataset, we must support all variables that
	* it supports.
	*/
	switch (ap->a_name) {
	case _PC_LINK_MAX:
	*ap->a_retval = MIN(LONG_MAX, ZFS_LINK_MAX);
	return (0);

	case _PC_FILESIZEBITS:
	*ap->a_retval = 64;
	return (0);

	case _PC_MIN_HOLE_SIZE:
	*ap->a_retval = (int)SPA_MINBLOCKSIZE;
	return (0);

	case _PC_ACL_EXTENDED:
	*ap->a_retval = 0;
	return (0);

	case _PC_ACL_NFS4:
	*ap->a_retval = 1;
	return (0);

	case _PC_ACL_PATH_MAX:
	*ap->a_retval = ACL_MAX_ENTRIES;
	return (0);

	case _PC_NAME_MAX:
	*ap->a_retval = NAME_MAX;
	return (0);

	default:
	return (vop_stdpathconf(ap));
	}
	}

	/*
	* Returns a trivial ACL
	*/
	static int
	zfsctl_common_getacl(struct vop_getacl_args *ap)
	{
	int i;

	if (ap->a_type != ACL_TYPE_NFS4)
	return (EINVAL);

	acl_nfs4_sync_acl_from_mode(ap->a_aclp, zfsctl_ctldir_mode, 0);
	/*
	* acl_nfs4_sync_acl_from_mode assumes that the owner can always modify
	* attributes. That is not the case for the ctldir, so we must clear
	* those bits. We also must clear ACL_READ_NAMED_ATTRS, because xattrs
	* aren't supported by the ctldir.
	*/
	for (i = 0; i < ap->a_aclp->acl_cnt; i++) {
	struct acl_entry *entry;
	entry = &(ap->a_aclp->acl_entry[i]);
	entry->ae_perm &= ~(ACL_WRITE_ACL \| ACL_WRITE_OWNER \|
	ACL_WRITE_ATTRIBUTES \| ACL_WRITE_NAMED_ATTRS \|
	ACL_READ_NAMED_ATTRS);
	}

	return (0);
	}

	static struct vop_vector zfsctl_ops_root = {
	.vop_default = &default_vnodeops,
	#if __FreeBSD_version >= 1300121
	.vop_fplookup_vexec = VOP_EAGAIN,
	#endif
	.vop_open = zfsctl_common_open,
	.vop_close = zfsctl_common_close,
	.vop_ioctl = VOP_EINVAL,
	.vop_getattr = zfsctl_root_getattr,
	.vop_access = zfsctl_common_access,
	.vop_readdir = zfsctl_root_readdir,
	.vop_lookup = zfsctl_root_lookup,
	.vop_inactive = VOP_NULL,
	.vop_reclaim = zfsctl_common_reclaim,
	.vop_fid = zfsctl_common_fid,
	.vop_print = zfsctl_common_print,
	.vop_vptocnp = zfsctl_root_vptocnp,
	.vop_pathconf = zfsctl_common_pathconf,
	.vop_getacl = zfsctl_common_getacl,
	};
	VFS_VOP_VECTOR_REGISTER(zfsctl_ops_root);

	static int
	zfsctl_snapshot_zname(vnode_t vp, const char name, int len, char *zname)
	{
	objset_t os = ((zfsvfs_t )((vp)->v_vfsp->vfs_data))->z_os;

	dmu_objset_name(os, zname);
	if (strlen(zname) + 1 + strlen(name) >= len)
	return (SET_ERROR(ENAMETOOLONG));
	(void) strcat(zname, "@");
	(void) strcat(zname, name);
	return (0);
	}

	static int
	zfsctl_snapshot_lookup(vnode_t vp, const char name, uint64_t *id)
	{
	objset_t os = ((zfsvfs_t )((vp)->v_vfsp->vfs_data))->z_os;
	int err;

	err = dsl_dataset_snap_lookup(dmu_objset_ds(os), name, id);
	return (err);
	}

	/*
	* Given a vnode get a root vnode of a filesystem mounted on top of
	* the vnode, if any. The root vnode is referenced and locked.
	* If no filesystem is mounted then the orinal vnode remains referenced
	* and locked. If any error happens the orinal vnode is unlocked and
	* released.
	*/
	static int
	zfsctl_mounted_here(vnode_t **vpp, int flags)
	{
	struct mount *mp;
	int err;

	ASSERT_VOP_LOCKED(*vpp, __func__);
	ASSERT3S((*vpp)->v_type, ==, VDIR);

	if ((mp = (*vpp)->v_mountedhere) != NULL) {
	err = vfs_busy(mp, 0);
	KASSERT(err == 0, ("vfs_busy(mp, 0) failed with %d", err));
	KASSERT(vrefcnt(*vpp) > 1, ("unreferenced mountpoint"));
	vput(*vpp);
	err = VFS_ROOT(mp, flags, vpp);
	vfs_unbusy(mp);
	return (err);
	}
	return (EJUSTRETURN);
	}

	typedef struct {
	const char *snap_name;
	uint64_t snap_id;
	} snapshot_setup_arg_t;

	static void
	zfsctl_snapshot_vnode_setup(vnode_t vp, void arg)
	{
	snapshot_setup_arg_t *ssa = arg;
	sfs_node_t *node;

	ASSERT_VOP_ELOCKED(vp, __func__);

	node = sfs_alloc_node(sizeof (sfs_node_t),
	ssa->snap_name, ZFSCTL_INO_SNAPDIR, ssa->snap_id);
	zfsctl_common_vnode_setup(vp, node);

	/* We have to support recursive locking. */
	VN_LOCK_AREC(vp);
	}

	/*
	* Lookup entry point for the 'snapshot' directory. Try to open the
	* snapshot if it exist, creating the pseudo filesystem vnode as necessary.
	* Perform a mount of the associated dataset on top of the vnode.
	* There are four possibilities:
	* - the snapshot node and vnode do not exist
	* - the snapshot vnode is covered by the mounted snapshot
	* - the snapshot vnode is not covered yet, the mount operation is in progress
	* - the snapshot vnode is not covered, because the snapshot has been unmounted
	* The last two states are transient and should be relatively short-lived.
	*/
	static int
	zfsctl_snapdir_lookup(struct vop_lookup_args *ap)
	{
	vnode_t *dvp = ap->a_dvp;
	vnode_t **vpp = ap->a_vpp;
	struct componentname *cnp = ap->a_cnp;
	char name[NAME_MAX + 1];
	char fullname[ZFS_MAX_DATASET_NAME_LEN];
	char *mountpoint;
	size_t mountpoint_len;
	zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
	uint64_t snap_id;
	int nameiop = cnp->cn_nameiop;
	int lkflags = cnp->cn_lkflags;
	int flags = cnp->cn_flags;
	int err;

	- ASSERT(dvp->v_type == VDIR);
	+ ASSERT3S(dvp->v_type, ==, VDIR);

	if ((flags & ISLASTCN) != 0 && nameiop != LOOKUP)
	return (SET_ERROR(ENOTSUP));

	if (cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.') {
	err = zfsctl_relock_dot(dvp, lkflags & LK_TYPE_MASK);
	if (err == 0)
	*vpp = dvp;
	return (err);
	}
	if (flags & ISDOTDOT) {
	err = vn_vget_ino_gen(dvp, zfsctl_root_vnode, NULL, lkflags,
	vpp);
	return (err);
	}

	if (cnp->cn_namelen >= sizeof (name))
	return (SET_ERROR(ENAMETOOLONG));

	strlcpy(name, ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen + 1);
	err = zfsctl_snapshot_lookup(dvp, name, &snap_id);
	if (err != 0)
	return (SET_ERROR(ENOENT));

	for (;;) {
	snapshot_setup_arg_t ssa;

	ssa.snap_name = name;
	ssa.snap_id = snap_id;
	err = sfs_vgetx(dvp->v_mount, LK_SHARED, ZFSCTL_INO_SNAPDIR,
	snap_id, "zfs", &zfsctl_ops_snapshot,
	zfsctl_snapshot_vnode_setup, &ssa, vpp);
	if (err != 0)
	return (err);

	/* Check if a new vnode has just been created. */
	if (VOP_ISLOCKED(*vpp) == LK_EXCLUSIVE)
	break;

	/*
	* Check if a snapshot is already mounted on top of the vnode.
	*/
	err = zfsctl_mounted_here(vpp, lkflags);
	if (err != EJUSTRETURN)
	return (err);

	/*
	* If the vnode is not covered, then either the mount operation
	* is in progress or the snapshot has already been unmounted
	* but the vnode hasn't been inactivated and reclaimed yet.
	* We can try to re-use the vnode in the latter case.
	*/
	VI_LOCK(*vpp);
	if (((*vpp)->v_iflag & VI_MOUNT) == 0) {
	/*
	* Upgrade to exclusive lock in order to:
	* - avoid race conditions
	* - satisfy the contract of mount_snapshot()
	*/
	err = VOP_LOCK(*vpp, LK_TRYUPGRADE \| LK_INTERLOCK);
	if (err == 0)
	break;
	} else {
	VI_UNLOCK(*vpp);
	}

	/*
	* In this state we can loop on uncontested locks and starve
	* the thread doing the lengthy, non-trivial mount operation.
	* So, yield to prevent that from happening.
	*/
	vput(*vpp);
	kern_yield(PRI_USER);
	}

	VERIFY0(zfsctl_snapshot_zname(dvp, name, sizeof (fullname), fullname));

	mountpoint_len = strlen(dvp->v_vfsp->mnt_stat.f_mntonname) +
	strlen("/" ZFS_CTLDIR_NAME "/snapshot/") + strlen(name) + 1;
	mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP);
	(void) snprintf(mountpoint, mountpoint_len,
	"%s/" ZFS_CTLDIR_NAME "/snapshot/%s",
	dvp->v_vfsp->mnt_stat.f_mntonname, name);

	err = mount_snapshot(curthread, vpp, "zfs", mountpoint, fullname, 0);
	kmem_free(mountpoint, mountpoint_len);
	if (err == 0) {
	/*
	* Fix up the root vnode mounted on .zfs/snapshot/<snapname>.
	*
	* This is where we lie about our v_vfsp in order to
	* make .zfs/snapshot/<snapname> accessible over NFS
	* without requiring manual mounts of <snapname>.
	*/
	- ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs);
	+ ASSERT3P(VTOZ(*vpp)->z_zfsvfs, !=, zfsvfs);
	VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs;

	/* Clear the root flag (set via VFS_ROOT) as well. */
	(*vpp)->v_vflag &= ~VV_ROOT;
	}

	if (err != 0)
	*vpp = NULL;
	return (err);
	}

	static int
	zfsctl_snapdir_readdir(struct vop_readdir_args *ap)
	{
	char snapname[ZFS_MAX_DATASET_NAME_LEN];
	struct dirent entry;
	vnode_t *vp = ap->a_vp;
	zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
	zfs_uio_t uio;
	int *eofp = ap->a_eofflag;
	off_t dots_offset;
	int error;

	zfs_uio_init(&uio, ap->a_uio);

	- ASSERT(vp->v_type == VDIR);
	+ ASSERT3S(vp->v_type, ==, VDIR);

	error = sfs_readdir_common(ZFSCTL_INO_ROOT, ZFSCTL_INO_SNAPDIR, ap,
	&uio, &dots_offset);
	if (error != 0) {
	if (error == ENAMETOOLONG) /* ran out of destination space */
	error = 0;
	return (error);
	}

	ZFS_ENTER(zfsvfs);
	for (;;) {
	uint64_t cookie;
	uint64_t id;

	cookie = zfs_uio_offset(&uio) - dots_offset;

	dsl_pool_config_enter(dmu_objset_pool(zfsvfs->z_os), FTAG);
	error = dmu_snapshot_list_next(zfsvfs->z_os, sizeof (snapname),
	snapname, &id, &cookie, NULL);
	dsl_pool_config_exit(dmu_objset_pool(zfsvfs->z_os), FTAG);
	if (error != 0) {
	if (error == ENOENT) {
	if (eofp != NULL)
	*eofp = 1;
	error = 0;
	}
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	entry.d_fileno = id;
	entry.d_type = DT_DIR;
	strcpy(entry.d_name, snapname);
	entry.d_namlen = strlen(entry.d_name);
	entry.d_reclen = sizeof (entry);
	error = vfs_read_dirent(ap, &entry, zfs_uio_offset(&uio));
	if (error != 0) {
	if (error == ENAMETOOLONG)
	error = 0;
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(error));
	}
	zfs_uio_setoffset(&uio, cookie + dots_offset);
	}
	/* NOTREACHED */
	}

	static int
	zfsctl_snapdir_getattr(struct vop_getattr_args *ap)
	{
	vnode_t *vp = ap->a_vp;
	vattr_t *vap = ap->a_vap;
	zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
	dsl_dataset_t *ds;
	uint64_t snap_count;
	int err;

	ZFS_ENTER(zfsvfs);
	ds = dmu_objset_ds(zfsvfs->z_os);
	zfsctl_common_getattr(vp, vap);
	vap->va_ctime = dmu_objset_snap_cmtime(zfsvfs->z_os);
	vap->va_mtime = vap->va_ctime;
	vap->va_birthtime = vap->va_ctime;
	if (dsl_dataset_phys(ds)->ds_snapnames_zapobj != 0) {
	err = zap_count(dmu_objset_pool(ds->ds_objset)->dp_meta_objset,
	dsl_dataset_phys(ds)->ds_snapnames_zapobj, &snap_count);
	if (err != 0) {
	ZFS_EXIT(zfsvfs);
	return (err);
	}
	vap->va_nlink += snap_count;
	}
	vap->va_size = vap->va_nlink;

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	static struct vop_vector zfsctl_ops_snapdir = {
	.vop_default = &default_vnodeops,
	#if __FreeBSD_version >= 1300121
	.vop_fplookup_vexec = VOP_EAGAIN,
	#endif
	.vop_open = zfsctl_common_open,
	.vop_close = zfsctl_common_close,
	.vop_getattr = zfsctl_snapdir_getattr,
	.vop_access = zfsctl_common_access,
	.vop_readdir = zfsctl_snapdir_readdir,
	.vop_lookup = zfsctl_snapdir_lookup,
	.vop_reclaim = zfsctl_common_reclaim,
	.vop_fid = zfsctl_common_fid,
	.vop_print = zfsctl_common_print,
	.vop_pathconf = zfsctl_common_pathconf,
	.vop_getacl = zfsctl_common_getacl,
	};
	VFS_VOP_VECTOR_REGISTER(zfsctl_ops_snapdir);


	static int
	zfsctl_snapshot_inactive(struct vop_inactive_args *ap)
	{
	vnode_t *vp = ap->a_vp;

	- VERIFY(vrecycle(vp) == 1);
	+ VERIFY3S(vrecycle(vp), ==, 1);
	return (0);
	}

	static int
	zfsctl_snapshot_reclaim(struct vop_reclaim_args *ap)
	{
	vnode_t *vp = ap->a_vp;
	void *data = vp->v_data;

	sfs_reclaim_vnode(vp);
	sfs_destroy_node(data);
	return (0);
	}

	static int
	zfsctl_snapshot_vptocnp(struct vop_vptocnp_args *ap)
	{
	struct mount *mp;
	vnode_t *dvp;
	vnode_t *vp;
	sfs_node_t *node;
	size_t len;
	int locked;
	int error;

	vp = ap->a_vp;
	node = vp->v_data;
	len = strlen(node->sn_name);
	if (*ap->a_buflen < len)
	return (SET_ERROR(ENOMEM));

	/*
	* Prevent unmounting of the snapshot while the vnode lock
	* is not held. That is not strictly required, but allows
	* us to assert that an uncovered snapshot vnode is never
	* "leaked".
	*/
	mp = vp->v_mountedhere;
	if (mp == NULL)
	return (SET_ERROR(ENOENT));
	error = vfs_busy(mp, 0);
	KASSERT(error == 0, ("vfs_busy(mp, 0) failed with %d", error));

	/*
	* We can vput the vnode as we can now depend on the reference owned
	* by the busied mp. But we also need to hold the vnode, because
	* the reference may go after vfs_unbusy() which has to be called
	* before we can lock the vnode again.
	*/
	locked = VOP_ISLOCKED(vp);
	#if __FreeBSD_version >= 1300045
	enum vgetstate vs = vget_prep(vp);
	#else
	vhold(vp);
	#endif
	vput(vp);

	/* Look up .zfs/snapshot, our parent. */
	error = zfsctl_snapdir_vnode(vp->v_mount, NULL, LK_SHARED, &dvp);
	if (error == 0) {
	VOP_UNLOCK1(dvp);
	*ap->a_vpp = dvp;
	*ap->a_buflen -= len;
	bcopy(node->sn_name, ap->a_buf + *ap->a_buflen, len);
	}
	vfs_unbusy(mp);
	#if __FreeBSD_version >= 1300045
	vget_finish(vp, locked \| LK_RETRY, vs);
	#else
	vget(vp, locked \| LK_VNHELD \| LK_RETRY, curthread);
	#endif
	return (error);
	}

	/*
	* These VP's should never see the light of day. They should always
	* be covered.
	*/
	static struct vop_vector zfsctl_ops_snapshot = {
	.vop_default = NULL, /* ensure very restricted access */
	#if __FreeBSD_version >= 1300121
	.vop_fplookup_vexec = VOP_EAGAIN,
	#endif
	.vop_inactive = zfsctl_snapshot_inactive,
	#if __FreeBSD_version >= 1300045
	.vop_need_inactive = vop_stdneed_inactive,
	#endif
	.vop_reclaim = zfsctl_snapshot_reclaim,
	.vop_vptocnp = zfsctl_snapshot_vptocnp,
	.vop_lock1 = vop_stdlock,
	.vop_unlock = vop_stdunlock,
	.vop_islocked = vop_stdislocked,
	.vop_advlockpurge = vop_stdadvlockpurge, /* called by vgone */
	.vop_print = zfsctl_common_print,
	};
	VFS_VOP_VECTOR_REGISTER(zfsctl_ops_snapshot);

	int
	zfsctl_lookup_objset(vfs_t vfsp, uint64_t objsetid, zfsvfs_t *zfsvfsp)
	{
	zfsvfs_t *zfsvfs __unused = vfsp->vfs_data;
	vnode_t *vp;
	int error;

	- ASSERT(zfsvfs->z_ctldir != NULL);
	+ ASSERT3P(zfsvfs->z_ctldir, !=, NULL);
	*zfsvfsp = NULL;
	error = sfs_vnode_get(vfsp, LK_EXCLUSIVE,
	ZFSCTL_INO_SNAPDIR, objsetid, &vp);
	if (error == 0 && vp != NULL) {
	/*
	* XXX Probably need to at least reference, if not busy, the mp.
	*/
	if (vp->v_mountedhere != NULL)
	*zfsvfsp = vp->v_mountedhere->mnt_data;
	vput(vp);
	}
	if (*zfsvfsp == NULL)
	return (SET_ERROR(EINVAL));
	return (0);
	}

	/*
	* Unmount any snapshots for the given filesystem. This is called from
	* zfs_umount() - if we have a ctldir, then go through and unmount all the
	* snapshots.
	*/
	int
	zfsctl_umount_snapshots(vfs_t vfsp, int fflags, cred_t cr)
	{
	char snapname[ZFS_MAX_DATASET_NAME_LEN];
	zfsvfs_t *zfsvfs = vfsp->vfs_data;
	struct mount *mp;
	vnode_t *vp;
	uint64_t cookie;
	int error;

	- ASSERT(zfsvfs->z_ctldir != NULL);
	+ ASSERT3P(zfsvfs->z_ctldir, !=, NULL);

	cookie = 0;
	for (;;) {
	uint64_t id;

	dsl_pool_config_enter(dmu_objset_pool(zfsvfs->z_os), FTAG);
	error = dmu_snapshot_list_next(zfsvfs->z_os, sizeof (snapname),
	snapname, &id, &cookie, NULL);
	dsl_pool_config_exit(dmu_objset_pool(zfsvfs->z_os), FTAG);
	if (error != 0) {
	if (error == ENOENT)
	error = 0;
	break;
	}

	for (;;) {
	error = sfs_vnode_get(vfsp, LK_EXCLUSIVE,
	ZFSCTL_INO_SNAPDIR, id, &vp);
	if (error != 0 \|\| vp == NULL)
	break;

	mp = vp->v_mountedhere;

	/*
	* v_mountedhere being NULL means that the
	* (uncovered) vnode is in a transient state
	* (mounting or unmounting), so loop until it
	* settles down.
	*/
	if (mp != NULL)
	break;
	vput(vp);
	}
	if (error != 0)
	break;
	if (vp == NULL)
	continue; /* no mountpoint, nothing to do */

	/*
	* The mount-point vnode is kept locked to avoid spurious EBUSY
	* from a concurrent umount.
	* The vnode lock must have recursive locking enabled.
	*/
	vfs_ref(mp);
	error = dounmount(mp, fflags, curthread);
	KASSERT_IMPLY(error == 0, vrefcnt(vp) == 1,
	("extra references after unmount"));
	vput(vp);
	if (error != 0)
	break;
	}
	KASSERT_IMPLY((fflags & MS_FORCE) != 0, error == 0,
	("force unmounting failed"));
	return (error);
	}

	int
	zfsctl_snapshot_unmount(const char *snapname, int flags __unused)
	{
	vfs_t *vfsp = NULL;
	zfsvfs_t *zfsvfs = NULL;

	if (strchr(snapname, '@') == NULL)
	return (0);

	int err = getzfsvfs(snapname, &zfsvfs);
	if (err != 0) {
	ASSERT3P(zfsvfs, ==, NULL);
	return (0);
	}
	vfsp = zfsvfs->z_vfs;

	ASSERT(!dsl_pool_config_held(dmu_objset_pool(zfsvfs->z_os)));

	vfs_ref(vfsp);
	vfs_unbusy(vfsp);
	return (dounmount(vfsp, MS_FORCE, curthread));
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_dir.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_dir.c
	index 899f2473f62a..7fff329a939c 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_dir.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_dir.c
	@@ -1,966 +1,963 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2013, 2016 by Delphix. All rights reserved.
	* Copyright 2017 Nexenta Systems, Inc.
	*/

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/systm.h>
	#include <sys/sysmacros.h>
	#include <sys/resource.h>
	#include <sys/vfs.h>
	#include <sys/vnode.h>
	#include <sys/extdirent.h>
	#include <sys/file.h>
	#include <sys/kmem.h>
	#include <sys/uio.h>
	#include <sys/cmn_err.h>
	#include <sys/errno.h>
	#include <sys/stat.h>
	#include <sys/unistd.h>
	#include <sys/sunddi.h>
	#include <sys/random.h>
	#include <sys/policy.h>
	#include <sys/condvar.h>
	#include <sys/callb.h>
	#include <sys/smp.h>
	#include <sys/zfs_dir.h>
	#include <sys/zfs_acl.h>
	#include <sys/fs/zfs.h>
	#include <sys/zap.h>
	#include <sys/dmu.h>
	#include <sys/atomic.h>
	#include <sys/zfs_ctldir.h>
	#include <sys/zfs_fuid.h>
	#include <sys/sa.h>
	#include <sys/zfs_sa.h>
	#include <sys/dmu_objset.h>
	#include <sys/dsl_dir.h>

	#include <sys/ccompat.h>

	/*
	* zfs_match_find() is used by zfs_dirent_lookup() to perform zap lookups
	* of names after deciding which is the appropriate lookup interface.
	*/
	static int
	zfs_match_find(zfsvfs_t zfsvfs, znode_t dzp, const char *name,
	matchtype_t mt, uint64_t *zoid)
	{
	int error;

	if (zfsvfs->z_norm) {

	/*
	* In the non-mixed case we only expect there would ever
	* be one match, but we need to use the normalizing lookup.
	*/
	error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1,
	zoid, mt, NULL, 0, NULL);
	} else {
	error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid);
	}
	zoid = ZFS_DIRENT_OBJ(zoid);

	return (error);
	}

	/*
	* Look up a directory entry under a locked vnode.
	* dvp being locked gives us a guarantee that there are no concurrent
	* modification of the directory and, thus, if a node can be found in
	* the directory, then it must not be unlinked.
	*
	* Input arguments:
	* dzp - znode for directory
	* name - name of entry to lock
	* flag - ZNEW: if the entry already exists, fail with EEXIST.
	* ZEXISTS: if the entry does not exist, fail with ENOENT.
	* ZXATTR: we want dzp's xattr directory
	*
	* Output arguments:
	* zpp - pointer to the znode for the entry (NULL if there isn't one)
	*
	* Return value: 0 on success or errno on failure.
	*
	* NOTE: Always checks for, and rejects, '.' and '..'.
	*/
	int
	zfs_dirent_lookup(znode_t dzp, const char name, znode_t **zpp, int flag)
	{
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	znode_t *zp;
	matchtype_t mt = 0;
	uint64_t zoid;
	int error = 0;

	if (zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_LOCKED(ZTOV(dzp), __func__);

	*zpp = NULL;

	/*
	* Verify that we are not trying to lock '.', '..', or '.zfs'
	*/
	if (name[0] == '.' &&
	(((name[1] == '\0') \|\| (name[1] == '.' && name[2] == '\0')) \|\|
	(zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0)))
	return (SET_ERROR(EEXIST));

	/*
	* Case sensitivity and normalization preferences are set when
	* the file system is created. These are stored in the
	* zfsvfs->z_case and zfsvfs->z_norm fields. These choices
	* affect how we perform zap lookups.
	*
	* When matching we may need to normalize & change case according to
	* FS settings.
	*
	* Note that a normalized match is necessary for a case insensitive
	* filesystem when the lookup request is not exact because normalization
	* can fold case independent of normalizing code point sequences.
	*
	* See the table above zfs_dropname().
	*/
	if (zfsvfs->z_norm != 0) {
	mt = MT_NORMALIZE;

	/*
	* Determine if the match needs to honor the case specified in
	* lookup, and if so keep track of that so that during
	* normalization we don't fold case.
	*/
	if (zfsvfs->z_case == ZFS_CASE_MIXED) {
	mt \|= MT_MATCH_CASE;
	}
	}

	/*
	* Only look in or update the DNLC if we are looking for the
	* name on a file system that does not require normalization
	* or case folding. We can also look there if we happen to be
	* on a non-normalizing, mixed sensitivity file system IF we
	* are looking for the exact name.
	*
	* NB: we do not need to worry about this flag for ZFS_CASE_SENSITIVE
	* because in that case MT_EXACT and MT_FIRST should produce exactly
	* the same result.
	*/

	if (dzp->z_unlinked && !(flag & ZXATTR))
	return (ENOENT);
	if (flag & ZXATTR) {
	error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid,
	sizeof (zoid));
	if (error == 0)
	error = (zoid == 0 ? ENOENT : 0);
	} else {
	error = zfs_match_find(zfsvfs, dzp, name, mt, &zoid);
	}
	if (error) {
	if (error != ENOENT \|\| (flag & ZEXISTS)) {
	return (error);
	}
	} else {
	if (flag & ZNEW) {
	return (SET_ERROR(EEXIST));
	}
	error = zfs_zget(zfsvfs, zoid, &zp);
	if (error)
	return (error);
	ASSERT(!zp->z_unlinked);
	*zpp = zp;
	}

	return (0);
	}

	static int
	zfs_dd_lookup(znode_t dzp, znode_t *zpp)
	{
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	znode_t *zp;
	uint64_t parent;
	int error;

	#ifdef ZFS_DEBUG
	if (zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_LOCKED(ZTOV(dzp), __func__);
	#endif
	if (dzp->z_unlinked)
	return (ENOENT);

	if ((error = sa_lookup(dzp->z_sa_hdl,
	SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0)
	return (error);

	error = zfs_zget(zfsvfs, parent, &zp);
	if (error == 0)
	*zpp = zp;
	return (error);
	}

	int
	zfs_dirlook(znode_t dzp, const char name, znode_t **zpp)
	{
	zfsvfs_t *zfsvfs __unused = dzp->z_zfsvfs;
	znode_t *zp = NULL;
	int error = 0;

	#ifdef ZFS_DEBUG
	if (zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_LOCKED(ZTOV(dzp), __func__);
	#endif
	if (dzp->z_unlinked)
	return (SET_ERROR(ENOENT));

	if (name[0] == 0 \|\| (name[0] == '.' && name[1] == 0)) {
	*zpp = dzp;
	} else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
	error = zfs_dd_lookup(dzp, &zp);
	if (error == 0)
	*zpp = zp;
	} else {
	error = zfs_dirent_lookup(dzp, name, &zp, ZEXISTS);
	if (error == 0) {
	dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
	*zpp = zp;
	}
	}
	return (error);
	}

	/*
	* unlinked Set (formerly known as the "delete queue") Error Handling
	*
	* When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
	* don't specify the name of the entry that we will be manipulating. We
	* also fib and say that we won't be adding any new entries to the
	* unlinked set, even though we might (this is to lower the minimum file
	* size that can be deleted in a full filesystem). So on the small
	* chance that the nlink list is using a fat zap (ie. has more than
	* 2000 entries), we may not pre-read a block that's needed.
	* Therefore it is remotely possible for some of the assertions
	* regarding the unlinked set below to fail due to i/o error. On a
	* nondebug system, this will result in the space being leaked.
	*/
	void
	zfs_unlinked_add(znode_t zp, dmu_tx_t tx)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;

	ASSERT(zp->z_unlinked);
	- ASSERT(zp->z_links == 0);
	+ ASSERT3U(zp->z_links, ==, 0);

	- VERIFY3U(0, ==,
	- zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
	+ VERIFY0(zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));

	dataset_kstats_update_nunlinks_kstat(&zfsvfs->z_kstat, 1);
	}

	/*
	* Clean up any znodes that had no links when we either crashed or
	* (force) umounted the file system.
	*/
	void
	zfs_unlinked_drain(zfsvfs_t *zfsvfs)
	{
	zap_cursor_t zc;
	zap_attribute_t zap;
	dmu_object_info_t doi;
	znode_t *zp;
	dmu_tx_t *tx;
	int error;

	/*
	* Iterate over the contents of the unlinked set.
	*/
	for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj);
	zap_cursor_retrieve(&zc, &zap) == 0;
	zap_cursor_advance(&zc)) {

	/*
	* See what kind of object we have in list
	*/

	error = dmu_object_info(zfsvfs->z_os,
	zap.za_first_integer, &doi);
	if (error != 0)
	continue;

	ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) \|\|
	(doi.doi_type == DMU_OT_DIRECTORY_CONTENTS));
	/*
	* We need to re-mark these list entries for deletion,
	* so we pull them back into core and set zp->z_unlinked.
	*/
	error = zfs_zget(zfsvfs, zap.za_first_integer, &zp);

	/*
	* We may pick up znodes that are already marked for deletion.
	* This could happen during the purge of an extended attribute
	* directory. All we need to do is skip over them, since they
	* are already in the system marked z_unlinked.
	*/
	if (error != 0)
	continue;

	vn_lock(ZTOV(zp), LK_EXCLUSIVE \| LK_RETRY);

	/*
	* Due to changes in zfs_rmnode we need to make sure the
	* link count is set to zero here.
	*/
	if (zp->z_links != 0) {
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error != 0) {
	dmu_tx_abort(tx);
	vput(ZTOV(zp));
	continue;
	}
	zp->z_links = 0;
	VERIFY0(sa_update(zp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
	&zp->z_links, sizeof (zp->z_links), tx));
	dmu_tx_commit(tx);
	}

	zp->z_unlinked = B_TRUE;
	vput(ZTOV(zp));
	}
	zap_cursor_fini(&zc);
	}

	/*
	* Delete the entire contents of a directory. Return a count
	* of the number of entries that could not be deleted. If we encounter
	* an error, return a count of at least one so that the directory stays
	* in the unlinked set.
	*
	* NOTE: this function assumes that the directory is inactive,
	* so there is no need to lock its entries before deletion.
	* Also, it assumes the directory contents is only regular
	* files.
	*/
	static int
	zfs_purgedir(znode_t *dzp)
	{
	zap_cursor_t zc;
	zap_attribute_t zap;
	znode_t *xzp;
	dmu_tx_t *tx;
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	int skipped = 0;
	int error;

	for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id);
	(error = zap_cursor_retrieve(&zc, &zap)) == 0;
	zap_cursor_advance(&zc)) {
	error = zfs_zget(zfsvfs,
	ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp);
	if (error) {
	skipped += 1;
	continue;
	}

	vn_lock(ZTOV(xzp), LK_EXCLUSIVE \| LK_RETRY);
	ASSERT((ZTOV(xzp)->v_type == VREG) \|\|
	(ZTOV(xzp)->v_type == VLNK));

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name);
	dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
	/* Is this really needed ? */
	zfs_sa_upgrade_txholds(tx, xzp);
	dmu_tx_mark_netfree(tx);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	vput(ZTOV(xzp));
	skipped += 1;
	continue;
	}

	error = zfs_link_destroy(dzp, zap.za_name, xzp, tx, 0, NULL);
	if (error)
	skipped += 1;
	dmu_tx_commit(tx);

	vput(ZTOV(xzp));
	}
	zap_cursor_fini(&zc);
	if (error != ENOENT)
	skipped += 1;
	return (skipped);
	}

	extern taskq_t *zfsvfs_taskq;

	void
	zfs_rmnode(znode_t *zp)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	objset_t *os = zfsvfs->z_os;
	dmu_tx_t *tx;
	uint64_t acl_obj;
	uint64_t xattr_obj;
	uint64_t count;
	int error;

	- ASSERT(zp->z_links == 0);
	+ ASSERT3U(zp->z_links, ==, 0);
	if (zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);

	/*
	* If this is an attribute directory, purge its contents.
	*/
	if (ZTOV(zp) != NULL && ZTOV(zp)->v_type == VDIR &&
	(zp->z_pflags & ZFS_XATTR)) {
	if (zfs_purgedir(zp) != 0) {
	/*
	* Not enough space to delete some xattrs.
	* Leave it in the unlinked set.
	*/
	zfs_znode_dmu_fini(zp);
	zfs_znode_free(zp);
	return;
	}
	} else {
	/*
	* Free up all the data in the file. We don't do this for
	* XATTR directories because we need truncate and remove to be
	* in the same tx, like in zfs_znode_delete(). Otherwise, if
	* we crash here we'll end up with an inconsistent truncated
	* zap object in the delete queue. Note a truncated file is
	* harmless since it only contains user data.
	*/
	error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
	if (error) {
	/*
	* Not enough space or we were interrupted by unmount.
	* Leave the file in the unlinked set.
	*/
	zfs_znode_dmu_fini(zp);
	zfs_znode_free(zp);
	return;
	}
	}

	/*
	* If the file has extended attributes, we're going to unlink
	* the xattr dir.
	*/
	error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
	&xattr_obj, sizeof (xattr_obj));
	if (error)
	xattr_obj = 0;

	acl_obj = zfs_external_acl(zp);

	/*
	* Set up the final transaction.
	*/
	tx = dmu_tx_create(os);
	dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END);
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
	if (xattr_obj)
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL);
	if (acl_obj)
	dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);

	zfs_sa_upgrade_txholds(tx, zp);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	/*
	* Not enough space to delete the file. Leave it in the
	* unlinked set, leaking it until the fs is remounted (at
	* which point we'll call zfs_unlinked_drain() to process it).
	*/
	dmu_tx_abort(tx);
	zfs_znode_dmu_fini(zp);
	zfs_znode_free(zp);
	return;
	}

	/*
	* FreeBSD's implementation of zfs_zget requires a vnode to back it.
	* This means that we could end up calling into getnewvnode while
	* calling zfs_rmnode as a result of a prior call to getnewvnode
	* trying to clear vnodes out of the cache. If this repeats we can
	* recurse enough that we overflow our stack. To avoid this, we
	* avoid calling zfs_zget on the xattr znode and instead simply add
	* it to the unlinked set and schedule a call to zfs_unlinked_drain.
	*/
	if (xattr_obj) {
	/* Add extended attribute directory to the unlinked set. */
	VERIFY3U(0, ==,
	zap_add_int(os, zfsvfs->z_unlinkedobj, xattr_obj, tx));
	}

	mutex_enter(&os->os_dsl_dataset->ds_dir->dd_activity_lock);

	/* Remove this znode from the unlinked set */
	VERIFY3U(0, ==,
	zap_remove_int(os, zfsvfs->z_unlinkedobj, zp->z_id, tx));

	if (zap_count(os, zfsvfs->z_unlinkedobj, &count) == 0 && count == 0) {
	cv_broadcast(&os->os_dsl_dataset->ds_dir->dd_activity_cv);
	}

	mutex_exit(&os->os_dsl_dataset->ds_dir->dd_activity_lock);

	dataset_kstats_update_nunlinked_kstat(&zfsvfs->z_kstat, 1);

	zfs_znode_delete(zp, tx);

	dmu_tx_commit(tx);

	if (xattr_obj) {
	/*
	* We're using the FreeBSD taskqueue API here instead of
	* the Solaris taskq API since the FreeBSD API allows for a
	* task to be enqueued multiple times but executed once.
	*/
	taskqueue_enqueue(zfsvfs_taskq->tq_queue,
	&zfsvfs->z_unlinked_drain_task);
	}
	}

	static uint64_t
	zfs_dirent(znode_t *zp, uint64_t mode)
	{
	uint64_t de = zp->z_id;

	if (zp->z_zfsvfs->z_version >= ZPL_VERSION_DIRENT_TYPE)
	de \|= IFTODT(mode) << 60;
	return (de);
	}

	/*
	* Link zp into dzp. Can only fail if zp has been unlinked.
	*/
	int
	zfs_link_create(znode_t dzp, const char name, znode_t zp, dmu_tx_t tx,
	int flag)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	vnode_t *vp = ZTOV(zp);
	uint64_t value;
	int zp_is_dir = (vp->v_type == VDIR);
	sa_bulk_attr_t bulk[5];
	uint64_t mtime[2], ctime[2];
	int count = 0;
	int error;

	if (zfsvfs->z_replay == B_FALSE) {
	ASSERT_VOP_ELOCKED(ZTOV(dzp), __func__);
	ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
	}
	if (zp_is_dir) {
	if (dzp->z_links >= ZFS_LINK_MAX)
	return (SET_ERROR(EMLINK));
	}
	if (!(flag & ZRENAMING)) {
	if (zp->z_unlinked) { /* no new links to unlinked zp */
	ASSERT(!(flag & (ZNEW \| ZEXISTS)));
	return (SET_ERROR(ENOENT));
	}
	if (zp->z_links >= ZFS_LINK_MAX - zp_is_dir) {
	return (SET_ERROR(EMLINK));
	}
	zp->z_links++;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
	&zp->z_links, sizeof (zp->z_links));

	} else {
	- ASSERT(zp->z_unlinked == 0);
	+ ASSERT(!zp->z_unlinked);
	}
	value = zfs_dirent(zp, zp->z_mode);
	error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, name,
	8, 1, &value, tx);

	/*
	* zap_add could fail to add the entry if it exceeds the capacity of the
	* leaf-block and zap_leaf_split() failed to help.
	* The caller of this routine is responsible for failing the transaction
	* which will rollback the SA updates done above.
	*/
	if (error != 0) {
	if (!(flag & ZRENAMING) && !(flag & ZNEW))
	zp->z_links--;
	return (error);
	}

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL,
	&dzp->z_id, sizeof (dzp->z_id));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, sizeof (zp->z_pflags));

	if (!(flag & ZNEW)) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	ctime, sizeof (ctime));
	zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime,
	ctime);
	}
	error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
	ASSERT0(error);

	dzp->z_size++;
	dzp->z_links += zp_is_dir;
	count = 0;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
	&dzp->z_size, sizeof (dzp->z_size));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
	&dzp->z_links, sizeof (dzp->z_links));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
	mtime, sizeof (mtime));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	ctime, sizeof (ctime));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&dzp->z_pflags, sizeof (dzp->z_pflags));
	zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime);
	error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
	ASSERT0(error);
	return (0);
	}

	/*
	* The match type in the code for this function should conform to:
	*
	* ------------------------------------------------------------------------
	* fs type \| z_norm \| lookup type \| match type
	* ---------\|-------------\|-------------\|----------------------------------
	* CS !norm \| 0 \| 0 \| 0 (exact)
	* CS norm \| formX \| 0 \| MT_NORMALIZE
	* CI !norm \| upper \| !ZCIEXACT \| MT_NORMALIZE
	* CI !norm \| upper \| ZCIEXACT \| MT_NORMALIZE \| MT_MATCH_CASE
	* CI norm \| upper\|formX \| !ZCIEXACT \| MT_NORMALIZE
	* CI norm \| upper\|formX \| ZCIEXACT \| MT_NORMALIZE \| MT_MATCH_CASE
	* CM !norm \| upper \| !ZCILOOK \| MT_NORMALIZE \| MT_MATCH_CASE
	* CM !norm \| upper \| ZCILOOK \| MT_NORMALIZE
	* CM norm \| upper\|formX \| !ZCILOOK \| MT_NORMALIZE \| MT_MATCH_CASE
	* CM norm \| upper\|formX \| ZCILOOK \| MT_NORMALIZE
	*
	* Abbreviations:
	* CS = Case Sensitive, CI = Case Insensitive, CM = Case Mixed
	* upper = case folding set by fs type on creation (U8_TEXTPREP_TOUPPER)
	* formX = unicode normalization form set on fs creation
	*/
	static int
	zfs_dropname(znode_t dzp, const char name, znode_t zp, dmu_tx_t tx,
	int flag)
	{
	int error;

	if (zp->z_zfsvfs->z_norm) {
	matchtype_t mt = MT_NORMALIZE;

	if (zp->z_zfsvfs->z_case == ZFS_CASE_MIXED) {
	mt \|= MT_MATCH_CASE;
	}

	error = zap_remove_norm(zp->z_zfsvfs->z_os, dzp->z_id,
	name, mt, tx);
	} else {
	error = zap_remove(zp->z_zfsvfs->z_os, dzp->z_id, name, tx);
	}

	return (error);
	}

	/*
	* Unlink zp from dzp, and mark zp for deletion if this was the last link.
	* Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
	* If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
	* If it's non-NULL, we use it to indicate whether the znode needs deletion,
	* and it's the caller's job to do it.
	*/
	int
	zfs_link_destroy(znode_t dzp, const char name, znode_t zp, dmu_tx_t tx,
	int flag, boolean_t *unlinkedp)
	{
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	vnode_t *vp = ZTOV(zp);
	int zp_is_dir = (vp->v_type == VDIR);
	boolean_t unlinked = B_FALSE;
	sa_bulk_attr_t bulk[5];
	uint64_t mtime[2], ctime[2];
	int count = 0;
	int error;

	if (zfsvfs->z_replay == B_FALSE) {
	ASSERT_VOP_ELOCKED(ZTOV(dzp), __func__);
	ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
	}
	if (!(flag & ZRENAMING)) {

	if (zp_is_dir && !zfs_dirempty(zp))
	return (SET_ERROR(ENOTEMPTY));

	/*
	* If we get here, we are going to try to remove the object.
	* First try removing the name from the directory; if that
	* fails, return the error.
	*/
	error = zfs_dropname(dzp, name, zp, tx, flag);
	if (error != 0) {
	return (error);
	}

	if (zp->z_links <= zp_is_dir) {
	zfs_panic_recover("zfs: link count on vnode %p is %u, "
	"should be at least %u", zp->z_vnode,
	(int)zp->z_links,
	zp_is_dir + 1);
	zp->z_links = zp_is_dir + 1;
	}
	if (--zp->z_links == zp_is_dir) {
	zp->z_unlinked = B_TRUE;
	zp->z_links = 0;
	unlinked = B_TRUE;
	} else {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
	NULL, &ctime, sizeof (ctime));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
	NULL, &zp->z_pflags, sizeof (zp->z_pflags));
	zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime,
	ctime);
	}
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
	NULL, &zp->z_links, sizeof (zp->z_links));
	error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
	count = 0;
	ASSERT0(error);
	} else {
	- ASSERT(zp->z_unlinked == 0);
	+ ASSERT(!zp->z_unlinked);
	error = zfs_dropname(dzp, name, zp, tx, flag);
	if (error != 0)
	return (error);
	}

	dzp->z_size--; /* one dirent removed */
	dzp->z_links -= zp_is_dir; /* ".." link from zp */
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
	NULL, &dzp->z_links, sizeof (dzp->z_links));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
	NULL, &dzp->z_size, sizeof (dzp->z_size));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
	NULL, ctime, sizeof (ctime));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
	NULL, mtime, sizeof (mtime));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
	NULL, &dzp->z_pflags, sizeof (dzp->z_pflags));
	zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime);
	error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
	ASSERT0(error);

	if (unlinkedp != NULL)
	*unlinkedp = unlinked;
	else if (unlinked)
	zfs_unlinked_add(zp, tx);

	return (0);
	}

	/*
	* Indicate whether the directory is empty.
	*/
	boolean_t
	zfs_dirempty(znode_t *dzp)
	{
	return (dzp->z_size == 2);
	}

	int
	zfs_make_xattrdir(znode_t zp, vattr_t vap, znode_t *xvpp, cred_t cr)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	znode_t *xzp;
	dmu_tx_t *tx;
	int error;
	zfs_acl_ids_t acl_ids;
	boolean_t fuid_dirtied;
	- uint64_t parent __unused;
	+ uint64_t parent __maybe_unused;

	*xvpp = NULL;

	if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL,
	&acl_ids)) != 0)
	return (error);
	if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, 0)) {
	zfs_acl_ids_free(&acl_ids);
	return (SET_ERROR(EDQUOT));
	}

	getnewvnode_reserve_();

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
	ZFS_SA_BASE_ATTR_SIZE);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
	dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_abort(tx);
	getnewvnode_drop_reserve();
	return (error);
	}
	zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids);

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	-#ifdef ZFS_DEBUG
	- error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
	- &parent, sizeof (parent));
	- ASSERT(error == 0 && parent == zp->z_id);
	-#endif
	+ ASSERT0(sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), &parent,
	+ sizeof (parent)));
	+ ASSERT3U(parent, ==, zp->z_id);

	- VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id,
	+ VERIFY0(sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id,
	sizeof (xzp->z_id), tx));

	zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp, xzp, "", NULL,
	acl_ids.z_fuidp, vap);

	zfs_acl_ids_free(&acl_ids);
	dmu_tx_commit(tx);

	getnewvnode_drop_reserve();

	*xvpp = xzp;

	return (0);
	}

	/*
	* Return a znode for the extended attribute directory for zp.
	* If the directory does not already exist, it is created
	*
	* IN: zp - znode to obtain attribute directory from
	* cr - credentials of caller
	* flags - flags from the VOP_LOOKUP call
	*
	* OUT: xzpp - pointer to extended attribute znode
	*
	* RETURN: 0 on success
	* error number on failure
	*/
	int
	zfs_get_xattrdir(znode_t zp, znode_t xzpp, cred_t cr, int flags)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	znode_t *xzp;
	vattr_t va;
	int error;
	top:
	error = zfs_dirent_lookup(zp, "", &xzp, ZXATTR);
	if (error)
	return (error);

	if (xzp != NULL) {
	*xzpp = xzp;
	return (0);
	}


	if (!(flags & CREATE_XATTR_DIR))
	return (SET_ERROR(ENOATTR));

	if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
	return (SET_ERROR(EROFS));
	}

	/*
	* The ability to 'create' files in an attribute
	* directory comes from the write_xattr permission on the base file.
	*
	* The ability to 'search' an attribute directory requires
	* read_xattr permission on the base file.
	*
	* Once in a directory the ability to read/write attributes
	* is controlled by the permissions on the attribute file.
	*/
	va.va_mask = AT_MODE \| AT_UID \| AT_GID;
	va.va_type = VDIR;
	va.va_mode = S_IFDIR \| S_ISVTX \| 0777;
	zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid);

	error = zfs_make_xattrdir(zp, &va, xzpp, cr);

	if (error == ERESTART) {
	/* NB: we already did dmu_tx_wait() if necessary */
	goto top;
	}
	if (error == 0)
	VOP_UNLOCK1(ZTOV(*xzpp));

	return (error);
	}

	/*
	* Decide whether it is okay to remove within a sticky directory.
	*
	* In sticky directories, write access is not sufficient;
	* you can remove entries from a directory only if:
	*
	* you own the directory,
	* you own the entry,
	* the entry is a plain file and you have write access,
	* or you are privileged (checked in secpolicy...).
	*
	* The function returns 0 if remove access is granted.
	*/
	int
	zfs_sticky_remove_access(znode_t zdp, znode_t zp, cred_t *cr)
	{
	uid_t uid;
	uid_t downer;
	uid_t fowner;
	zfsvfs_t *zfsvfs = zdp->z_zfsvfs;

	if (zdp->z_zfsvfs->z_replay)
	return (0);

	if ((zdp->z_mode & S_ISVTX) == 0)
	return (0);

	downer = zfs_fuid_map_id(zfsvfs, zdp->z_uid, cr, ZFS_OWNER);
	fowner = zfs_fuid_map_id(zfsvfs, zp->z_uid, cr, ZFS_OWNER);

	if ((uid = crgetuid(cr)) == downer \|\| uid == fowner \|\|
	(ZTOV(zp)->v_type == VREG &&
	zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
	return (0);
	else
	return (secpolicy_vnode_remove(ZTOV(zp), cr));
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_file_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_file_os.c
	index 908cff6810eb..a3d67aaa11ba 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_file_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_file_os.c
	@@ -1,306 +1,299 @@
	/*
	* Copyright (c) 2020 iXsystems, Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	*/

	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	#include <sys/dmu.h>
	#include <sys/dmu_impl.h>
	#include <sys/dmu_recv.h>
	#include <sys/dmu_tx.h>
	#include <sys/dbuf.h>
	#include <sys/dnode.h>
	#include <sys/zfs_context.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_synctask.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zap.h>
	#include <sys/zio_checksum.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_file.h>
	#include <sys/buf.h>
	#include <sys/stat.h>

	int
	zfs_file_open(const char path, int flags, int mode, zfs_file_t *fpp)
	{
	struct thread *td;
	int rc, fd;

	td = curthread;
	pwd_ensure_dirs();
	/* 12.x doesn't take a const char * */
	rc = kern_openat(td, AT_FDCWD, __DECONST(char *, path),
	UIO_SYSSPACE, flags, mode);
	if (rc)
	return (SET_ERROR(rc));
	fd = td->td_retval[0];
	td->td_retval[0] = 0;
	if (fget(curthread, fd, &cap_no_rights, fpp))
	kern_close(td, fd);
	return (0);
	}

	void
	zfs_file_close(zfs_file_t *fp)
	{
	fo_close(fp, curthread);
	}

	static int
	zfs_file_write_impl(zfs_file_t fp, const void buf, size_t count, loff_t *offp,
	ssize_t *resid)
	{
	ssize_t rc;
	struct uio auio;
	struct thread *td;
	struct iovec aiov;

	td = curthread;
	aiov.iov_base = (void *)(uintptr_t)buf;
	aiov.iov_len = count;
	auio.uio_iov = &aiov;
	auio.uio_iovcnt = 1;
	auio.uio_segflg = UIO_SYSSPACE;
	auio.uio_resid = count;
	auio.uio_rw = UIO_WRITE;
	auio.uio_td = td;
	auio.uio_offset = *offp;

	if ((fp->f_flag & FWRITE) == 0)
	return (SET_ERROR(EBADF));

	if (fp->f_type == DTYPE_VNODE)
	bwillwrite();

	rc = fo_write(fp, &auio, td->td_ucred, FOF_OFFSET, td);
	if (rc)
	return (SET_ERROR(rc));
	if (resid)
	*resid = auio.uio_resid;
	else if (auio.uio_resid)
	return (SET_ERROR(EIO));
	*offp += count - auio.uio_resid;
	return (rc);
	}

	int
	zfs_file_write(zfs_file_t fp, const void buf, size_t count, ssize_t *resid)
	{
	loff_t off = fp->f_offset;
	ssize_t rc;

	rc = zfs_file_write_impl(fp, buf, count, &off, resid);
	if (rc == 0)
	fp->f_offset = off;

	return (SET_ERROR(rc));
	}

	int
	zfs_file_pwrite(zfs_file_t fp, const void buf, size_t count, loff_t off,
	ssize_t *resid)
	{
	return (zfs_file_write_impl(fp, buf, count, &off, resid));
	}

	static int
	zfs_file_read_impl(zfs_file_t fp, void buf, size_t count, loff_t *offp,
	ssize_t *resid)
	{
	ssize_t rc;
	struct uio auio;
	struct thread *td;
	struct iovec aiov;

	td = curthread;
	aiov.iov_base = (void *)(uintptr_t)buf;
	aiov.iov_len = count;
	auio.uio_iov = &aiov;
	auio.uio_iovcnt = 1;
	auio.uio_segflg = UIO_SYSSPACE;
	auio.uio_resid = count;
	auio.uio_rw = UIO_READ;
	auio.uio_td = td;
	auio.uio_offset = *offp;

	if ((fp->f_flag & FREAD) == 0)
	return (SET_ERROR(EBADF));

	rc = fo_read(fp, &auio, td->td_ucred, FOF_OFFSET, td);
	if (rc)
	return (SET_ERROR(rc));
	if (resid)
	*resid = auio.uio_resid;
	*offp += count - auio.uio_resid;
	return (SET_ERROR(0));
	}

	int
	zfs_file_read(zfs_file_t fp, void buf, size_t count, ssize_t *resid)
	{
	loff_t off = fp->f_offset;
	ssize_t rc;

	rc = zfs_file_read_impl(fp, buf, count, &off, resid);
	if (rc == 0)
	fp->f_offset = off;
	return (rc);
	}

	int
	zfs_file_pread(zfs_file_t fp, void buf, size_t count, loff_t off,
	ssize_t *resid)
	{
	return (zfs_file_read_impl(fp, buf, count, &off, resid));
	}

	int
	zfs_file_seek(zfs_file_t fp, loff_t offp, int whence)
	{
	int rc;
	struct thread *td;

	td = curthread;
	if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0)
	return (SET_ERROR(ESPIPE));
	rc = fo_seek(fp, *offp, whence, td);
	if (rc == 0)
	*offp = td->td_uretoff.tdu_off;
	return (SET_ERROR(rc));
	}

	int
	zfs_file_getattr(zfs_file_t fp, zfs_file_attr_t zfattr)
	{
	struct thread *td;
	struct stat sb;
	int rc;

	td = curthread;

	rc = fo_stat(fp, &sb, td->td_ucred, td);
	if (rc)
	return (SET_ERROR(rc));
	zfattr->zfa_size = sb.st_size;
	zfattr->zfa_mode = sb.st_mode;

	return (0);
	}

	static __inline int
	zfs_vop_fsync(vnode_t *vp)
	{
	struct mount *mp;
	int error;

	if ((error = vn_start_write(vp, &mp, V_WAIT \| PCATCH)) != 0)
	goto drop;
	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY);
	error = VOP_FSYNC(vp, MNT_WAIT, curthread);
	VOP_UNLOCK1(vp);
	vn_finished_write(mp);
	drop:
	return (SET_ERROR(error));
	}

	int
	zfs_file_fsync(zfs_file_t *fp, int flags)
	{
	if (fp->f_type != DTYPE_VNODE)
	return (EINVAL);

	return (zfs_vop_fsync(fp->f_vnode));
	}

	-int
	-zfs_file_get(int fd, zfs_file_t **fpp)
	+zfs_file_t *
	+zfs_file_get(int fd)
	{
	struct file *fp;

	if (fget(curthread, fd, &cap_no_rights, &fp))
	- return (SET_ERROR(EBADF));
	+ return (NULL);

	- *fpp = fp;
	- return (0);
	+ return (fp);
	}

	void
	-zfs_file_put(int fd)
	+zfs_file_put(zfs_file_t *fp)
	{
	- struct file *fp;
	-
	- /* No CAP_ rights required, as we're only releasing. */
	- if (fget(curthread, fd, &cap_no_rights, &fp) == 0) {
	- fdrop(fp, curthread);
	- fdrop(fp, curthread);
	- }
	+ fdrop(fp, curthread);
	}

	loff_t
	zfs_file_off(zfs_file_t *fp)
	{
	return (fp->f_offset);
	}

	void *
	zfs_file_private(zfs_file_t *fp)
	{
	file_t *tmpfp;
	void *data;
	int error;

	tmpfp = curthread->td_fpop;
	curthread->td_fpop = fp;
	error = devfs_get_cdevpriv(&data);
	curthread->td_fpop = tmpfp;
	if (error != 0)
	return (NULL);
	return (data);
	}

	int
	zfs_file_unlink(const char *fnamep)
	{
	zfs_uio_seg_t seg = UIO_SYSSPACE;
	int rc;

	#if __FreeBSD_version >= 1300018
	rc = kern_funlinkat(curthread, AT_FDCWD, fnamep, FD_NONE, seg, 0, 0);
	#elif __FreeBSD_version >= 1202504 \|\| defined(AT_BENEATH)
	rc = kern_unlinkat(curthread, AT_FDCWD, __DECONST(char *, fnamep),
	seg, 0, 0);
	#else
	rc = kern_unlinkat(curthread, AT_FDCWD, __DECONST(char *, fnamep),
	seg, 0);
	#endif
	return (SET_ERROR(rc));
	}
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c
	index b05105e0bb22..c534309351e9 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c
	@@ -1,2334 +1,2338 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>.
	* All rights reserved.
	* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	* Copyright 2016 Nexenta Systems, Inc. All rights reserved.
	*/

	/* Portions Copyright 2010 Robert Milkowski */

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/systm.h>
	#include <sys/kernel.h>
	#include <sys/sysmacros.h>
	#include <sys/kmem.h>
	#include <sys/acl.h>
	#include <sys/vnode.h>
	#include <sys/vfs.h>
	#include <sys/mntent.h>
	#include <sys/mount.h>
	#include <sys/cmn_err.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_vnops.h>
	#include <sys/zfs_dir.h>
	#include <sys/zil.h>
	#include <sys/fs/zfs.h>
	#include <sys/dmu.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_deleg.h>
	#include <sys/spa.h>
	#include <sys/zap.h>
	#include <sys/sa.h>
	#include <sys/sa_impl.h>
	#include <sys/policy.h>
	#include <sys/atomic.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zfs_ctldir.h>
	#include <sys/zfs_fuid.h>
	#include <sys/sunddi.h>
	#include <sys/dmu_objset.h>
	#include <sys/dsl_dir.h>
	#include <sys/spa_boot.h>
	#include <sys/jail.h>
	#include <ufs/ufs/quota.h>
	#include <sys/zfs_quota.h>

	#include "zfs_comutil.h"

	#ifndef MNTK_VMSETSIZE_BUG
	#define MNTK_VMSETSIZE_BUG 0
	#endif
	#ifndef MNTK_NOMSYNC
	#define MNTK_NOMSYNC 8
	#endif

	/* BEGIN CSTYLED */
	struct mtx zfs_debug_mtx;
	MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF);

	SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system");

	int zfs_super_owner;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0,
	"File system owner can perform privileged operation on his file systems");

	int zfs_debug_level;
	SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RWTUN, &zfs_debug_level, 0,
	"Debug level");

	SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions");
	static int zfs_version_acl = ZFS_ACL_VERSION;
	SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0,
	"ZFS_ACL_VERSION");
	static int zfs_version_spa = SPA_VERSION;
	SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0,
	"SPA_VERSION");
	static int zfs_version_zpl = ZPL_VERSION;
	SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0,
	"ZPL_VERSION");
	/* END CSTYLED */

	#if __FreeBSD_version >= 1400018
	static int zfs_quotactl(vfs_t vfsp, int cmds, uid_t id, void arg,
	bool *mp_busy);
	#else
	static int zfs_quotactl(vfs_t vfsp, int cmds, uid_t id, void arg);
	#endif
	static int zfs_mount(vfs_t *vfsp);
	static int zfs_umount(vfs_t *vfsp, int fflag);
	static int zfs_root(vfs_t vfsp, int flags, vnode_t *vpp);
	static int zfs_statfs(vfs_t vfsp, struct statfs statp);
	static int zfs_vget(vfs_t vfsp, ino_t ino, int flags, vnode_t *vpp);
	static int zfs_sync(vfs_t *vfsp, int waitfor);
	#if __FreeBSD_version >= 1300098
	static int zfs_checkexp(vfs_t vfsp, struct sockaddr nam, uint64_t *extflagsp,
	struct ucred *credanonp, int numsecflavors, int *secflavors);
	#else
	static int zfs_checkexp(vfs_t vfsp, struct sockaddr nam, int *extflagsp,
	struct ucred *credanonp, int numsecflavors, int **secflavors);
	#endif
	static int zfs_fhtovp(vfs_t vfsp, fid_t fidp, int flags, vnode_t **vpp);
	static void zfs_freevfs(vfs_t *vfsp);

	struct vfsops zfs_vfsops = {
	.vfs_mount = zfs_mount,
	.vfs_unmount = zfs_umount,
	#if __FreeBSD_version >= 1300049
	.vfs_root = vfs_cache_root,
	.vfs_cachedroot = zfs_root,
	#else
	.vfs_root = zfs_root,
	#endif
	.vfs_statfs = zfs_statfs,
	.vfs_vget = zfs_vget,
	.vfs_sync = zfs_sync,
	.vfs_checkexp = zfs_checkexp,
	.vfs_fhtovp = zfs_fhtovp,
	.vfs_quotactl = zfs_quotactl,
	};

	VFS_SET(zfs_vfsops, zfs, VFCF_JAIL \| VFCF_DELEGADMIN);

	/*
	* We need to keep a count of active fs's.
	* This is necessary to prevent our module
	* from being unloaded after a umount -f
	*/
	static uint32_t zfs_active_fs_count = 0;

	int
	zfs_get_temporary_prop(dsl_dataset_t ds, zfs_prop_t zfs_prop, uint64_t val,
	char *setpoint)
	{
	int error;
	zfsvfs_t *zfvp;
	vfs_t *vfsp;
	objset_t *os;
	uint64_t tmp = *val;

	error = dmu_objset_from_ds(ds, &os);
	if (error != 0)
	return (error);

	error = getzfsvfs_impl(os, &zfvp);
	if (error != 0)
	return (error);
	if (zfvp == NULL)
	return (ENOENT);
	vfsp = zfvp->z_vfs;
	switch (zfs_prop) {
	case ZFS_PROP_ATIME:
	if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL))
	tmp = 0;
	if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL))
	tmp = 1;
	break;
	case ZFS_PROP_DEVICES:
	if (vfs_optionisset(vfsp, MNTOPT_NODEVICES, NULL))
	tmp = 0;
	if (vfs_optionisset(vfsp, MNTOPT_DEVICES, NULL))
	tmp = 1;
	break;
	case ZFS_PROP_EXEC:
	if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL))
	tmp = 0;
	if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL))
	tmp = 1;
	break;
	case ZFS_PROP_SETUID:
	if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL))
	tmp = 0;
	if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL))
	tmp = 1;
	break;
	case ZFS_PROP_READONLY:
	if (vfs_optionisset(vfsp, MNTOPT_RW, NULL))
	tmp = 0;
	if (vfs_optionisset(vfsp, MNTOPT_RO, NULL))
	tmp = 1;
	break;
	case ZFS_PROP_XATTR:
	if (zfvp->z_flags & ZSB_XATTR)
	tmp = zfvp->z_xattr;
	break;
	case ZFS_PROP_NBMAND:
	if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL))
	tmp = 0;
	if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL))
	tmp = 1;
	break;
	default:
	vfs_unbusy(vfsp);
	return (ENOENT);
	}

	vfs_unbusy(vfsp);
	if (tmp != *val) {
	(void) strcpy(setpoint, "temporary");
	*val = tmp;
	}
	return (0);
	}

	static int
	zfs_getquota(zfsvfs_t zfsvfs, uid_t id, int isgroup, struct dqblk64 dqp)
	{
	int error = 0;
	char buf[32];
	uint64_t usedobj, quotaobj;
	uint64_t quota, used = 0;
	timespec_t now;

	usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT;
	quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;

	if (quotaobj == 0 \|\| zfsvfs->z_replay) {
	error = ENOENT;
	goto done;
	}
	(void) sprintf(buf, "%llx", (longlong_t)id);
	if ((error = zap_lookup(zfsvfs->z_os, quotaobj,
	buf, sizeof (quota), 1, &quota)) != 0) {
	dprintf("%s(%d): quotaobj lookup failed\n",
	__FUNCTION__, __LINE__);
	goto done;
	}
	/*
	* quota(8) uses bsoftlimit as "quoota", and hardlimit as "limit".
	* So we set them to be the same.
	*/
	dqp->dqb_bsoftlimit = dqp->dqb_bhardlimit = btodb(quota);
	error = zap_lookup(zfsvfs->z_os, usedobj, buf, sizeof (used), 1, &used);
	if (error && error != ENOENT) {
	dprintf("%s(%d): usedobj failed; %d\n",
	__FUNCTION__, __LINE__, error);
	goto done;
	}
	dqp->dqb_curblocks = btodb(used);
	dqp->dqb_ihardlimit = dqp->dqb_isoftlimit = 0;
	vfs_timestamp(&now);
	/*
	* Setting this to 0 causes FreeBSD quota(8) to print
	* the number of days since the epoch, which isn't
	* particularly useful.
	*/
	dqp->dqb_btime = dqp->dqb_itime = now.tv_sec;
	done:
	return (error);
	}

	static int
	#if __FreeBSD_version >= 1400018
	zfs_quotactl(vfs_t vfsp, int cmds, uid_t id, void arg, bool *mp_busy)
	#else
	zfs_quotactl(vfs_t vfsp, int cmds, uid_t id, void arg)
	#endif
	{
	zfsvfs_t *zfsvfs = vfsp->vfs_data;
	struct thread *td;
	int cmd, type, error = 0;
	int bitsize;
	zfs_userquota_prop_t quota_type;
	struct dqblk64 dqblk = { 0 };

	td = curthread;
	cmd = cmds >> SUBCMDSHIFT;
	type = cmds & SUBCMDMASK;

	ZFS_ENTER(zfsvfs);
	if (id == -1) {
	switch (type) {
	case USRQUOTA:
	id = td->td_ucred->cr_ruid;
	break;
	case GRPQUOTA:
	id = td->td_ucred->cr_rgid;
	break;
	default:
	error = EINVAL;
	#if __FreeBSD_version < 1400018
	if (cmd == Q_QUOTAON \|\| cmd == Q_QUOTAOFF)
	vfs_unbusy(vfsp);
	#endif
	goto done;
	}
	}
	/*
	* Map BSD type to:
	* ZFS_PROP_USERUSED,
	* ZFS_PROP_USERQUOTA,
	* ZFS_PROP_GROUPUSED,
	* ZFS_PROP_GROUPQUOTA
	*/
	switch (cmd) {
	case Q_SETQUOTA:
	case Q_SETQUOTA32:
	if (type == USRQUOTA)
	quota_type = ZFS_PROP_USERQUOTA;
	else if (type == GRPQUOTA)
	quota_type = ZFS_PROP_GROUPQUOTA;
	else
	error = EINVAL;
	break;
	case Q_GETQUOTA:
	case Q_GETQUOTA32:
	if (type == USRQUOTA)
	quota_type = ZFS_PROP_USERUSED;
	else if (type == GRPQUOTA)
	quota_type = ZFS_PROP_GROUPUSED;
	else
	error = EINVAL;
	break;
	}

	/*
	* Depending on the cmd, we may need to get
	* the ruid and domain (see fuidstr_to_sid?),
	* the fuid (how?), or other information.
	* Create fuid using zfs_fuid_create(zfsvfs, id,
	* ZFS_OWNER or ZFS_GROUP, cr, &fuidp)?
	* I think I can use just the id?
	*
	* Look at zfs_id_overquota() to look up a quota.
	* zap_lookup(something, quotaobj, fuidstring,
	* sizeof (long long), 1, &quota)
	*
	* See zfs_set_userquota() to set a quota.
	*/
	if ((uint32_t)type >= MAXQUOTAS) {
	error = EINVAL;
	goto done;
	}

	switch (cmd) {
	case Q_GETQUOTASIZE:
	bitsize = 64;
	error = copyout(&bitsize, arg, sizeof (int));
	break;
	case Q_QUOTAON:
	// As far as I can tell, you can't turn quotas on or off on zfs
	error = 0;
	#if __FreeBSD_version < 1400018
	vfs_unbusy(vfsp);
	#endif
	break;
	case Q_QUOTAOFF:
	error = ENOTSUP;
	#if __FreeBSD_version < 1400018
	vfs_unbusy(vfsp);
	#endif
	break;
	case Q_SETQUOTA:
	error = copyin(arg, &dqblk, sizeof (dqblk));
	if (error == 0)
	error = zfs_set_userquota(zfsvfs, quota_type,
	"", id, dbtob(dqblk.dqb_bhardlimit));
	break;
	case Q_GETQUOTA:
	error = zfs_getquota(zfsvfs, id, type == GRPQUOTA, &dqblk);
	if (error == 0)
	error = copyout(&dqblk, arg, sizeof (dqblk));
	break;
	default:
	error = EINVAL;
	break;
	}
	done:
	ZFS_EXIT(zfsvfs);
	return (error);
	}


	boolean_t
	zfs_is_readonly(zfsvfs_t *zfsvfs)
	{
	return (!!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY));
	}

	/ARGSUSED/
	static int
	zfs_sync(vfs_t *vfsp, int waitfor)
	{

	/*
	* Data integrity is job one. We don't want a compromised kernel
	* writing to the storage pool, so we never sync during panic.
	*/
	if (panicstr)
	return (0);

	/*
	* Ignore the system syncher. ZFS already commits async data
	* at zfs_txg_timeout intervals.
	*/
	if (waitfor == MNT_LAZY)
	return (0);

	if (vfsp != NULL) {
	/*
	* Sync a specific filesystem.
	*/
	zfsvfs_t *zfsvfs = vfsp->vfs_data;
	dsl_pool_t *dp;
	int error;

	error = vfs_stdsync(vfsp, waitfor);
	if (error != 0)
	return (error);

	ZFS_ENTER(zfsvfs);
	dp = dmu_objset_pool(zfsvfs->z_os);

	/*
	* If the system is shutting down, then skip any
	* filesystems which may exist on a suspended pool.
	*/
	if (rebooting && spa_suspended(dp->dp_spa)) {
	ZFS_EXIT(zfsvfs);
	return (0);
	}

	if (zfsvfs->z_log != NULL)
	zil_commit(zfsvfs->z_log, 0);

	ZFS_EXIT(zfsvfs);
	} else {
	/*
	* Sync all ZFS filesystems. This is what happens when you
	* run sync(8). Unlike other filesystems, ZFS honors the
	* request by waiting for all pools to commit all dirty data.
	*/
	spa_sync_allpools();
	}

	return (0);
	}

	static void
	atime_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	if (newval == TRUE) {
	zfsvfs->z_atime = TRUE;
	zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME;
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0);
	} else {
	zfsvfs->z_atime = FALSE;
	zfsvfs->z_vfs->vfs_flag \|= MNT_NOATIME;
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0);
	}
	}

	static void
	xattr_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	if (newval == ZFS_XATTR_OFF) {
	zfsvfs->z_flags &= ~ZSB_XATTR;
	} else {
	zfsvfs->z_flags \|= ZSB_XATTR;

	if (newval == ZFS_XATTR_SA)
	zfsvfs->z_xattr_sa = B_TRUE;
	else
	zfsvfs->z_xattr_sa = B_FALSE;
	}
	}

	static void
	blksz_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;
	ASSERT3U(newval, <=, spa_maxblocksize(dmu_objset_spa(zfsvfs->z_os)));
	ASSERT3U(newval, >=, SPA_MINBLOCKSIZE);
	ASSERT(ISP2(newval));

	zfsvfs->z_max_blksz = newval;
	zfsvfs->z_vfs->mnt_stat.f_iosize = newval;
	}

	static void
	readonly_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	if (newval) {
	/* XXX locking on vfs_flag? */
	zfsvfs->z_vfs->vfs_flag \|= VFS_RDONLY;
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0);
	} else {
	/* XXX locking on vfs_flag? */
	zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0);
	}
	}

	static void
	setuid_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	if (newval == FALSE) {
	zfsvfs->z_vfs->vfs_flag \|= VFS_NOSETUID;
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0);
	} else {
	zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID;
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0);
	}
	}

	static void
	exec_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	if (newval == FALSE) {
	zfsvfs->z_vfs->vfs_flag \|= VFS_NOEXEC;
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0);
	} else {
	zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC;
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0);
	}
	}

	/*
	* The nbmand mount option can be changed at mount time.
	* We can't allow it to be toggled on live file systems or incorrect
	* behavior may be seen from cifs clients
	*
	* This property isn't registered via dsl_prop_register(), but this callback
	* will be called when a file system is first mounted
	*/
	static void
	nbmand_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;
	if (newval == FALSE) {
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0);
	} else {
	vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND);
	vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0);
	}
	}

	static void
	snapdir_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	zfsvfs->z_show_ctldir = newval;
	}

	static void
	vscan_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	zfsvfs->z_vscan = newval;
	}

	static void
	acl_mode_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	zfsvfs->z_acl_mode = newval;
	}

	static void
	acl_inherit_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	zfsvfs->z_acl_inherit = newval;
	}

	static void
	acl_type_changed_cb(void *arg, uint64_t newval)
	{
	zfsvfs_t *zfsvfs = arg;

	zfsvfs->z_acl_type = newval;
	}

	static int
	zfs_register_callbacks(vfs_t *vfsp)
	{
	struct dsl_dataset *ds = NULL;
	objset_t *os = NULL;
	zfsvfs_t *zfsvfs = NULL;
	uint64_t nbmand;
	boolean_t readonly = B_FALSE;
	boolean_t do_readonly = B_FALSE;
	boolean_t setuid = B_FALSE;
	boolean_t do_setuid = B_FALSE;
	boolean_t exec = B_FALSE;
	boolean_t do_exec = B_FALSE;
	boolean_t xattr = B_FALSE;
	boolean_t atime = B_FALSE;
	boolean_t do_atime = B_FALSE;
	boolean_t do_xattr = B_FALSE;
	int error = 0;

	- ASSERT(vfsp);
	+ ASSERT3P(vfsp, !=, NULL);
	zfsvfs = vfsp->vfs_data;
	- ASSERT(zfsvfs);
	+ ASSERT3P(zfsvfs, !=, NULL);
	os = zfsvfs->z_os;

	/*
	* This function can be called for a snapshot when we update snapshot's
	* mount point, which isn't really supported.
	*/
	if (dmu_objset_is_snapshot(os))
	return (EOPNOTSUPP);

	/*
	* The act of registering our callbacks will destroy any mount
	* options we may have. In order to enable temporary overrides
	* of mount options, we stash away the current values and
	* restore them after we register the callbacks.
	*/
	if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) \|\|
	!spa_writeable(dmu_objset_spa(os))) {
	readonly = B_TRUE;
	do_readonly = B_TRUE;
	} else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) {
	readonly = B_FALSE;
	do_readonly = B_TRUE;
	}
	if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) {
	setuid = B_FALSE;
	do_setuid = B_TRUE;
	} else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) {
	setuid = B_TRUE;
	do_setuid = B_TRUE;
	}
	if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) {
	exec = B_FALSE;
	do_exec = B_TRUE;
	} else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) {
	exec = B_TRUE;
	do_exec = B_TRUE;
	}
	if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) {
	zfsvfs->z_xattr = xattr = ZFS_XATTR_OFF;
	do_xattr = B_TRUE;
	} else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) {
	zfsvfs->z_xattr = xattr = ZFS_XATTR_DIR;
	do_xattr = B_TRUE;
	} else if (vfs_optionisset(vfsp, MNTOPT_DIRXATTR, NULL)) {
	zfsvfs->z_xattr = xattr = ZFS_XATTR_DIR;
	do_xattr = B_TRUE;
	} else if (vfs_optionisset(vfsp, MNTOPT_SAXATTR, NULL)) {
	zfsvfs->z_xattr = xattr = ZFS_XATTR_SA;
	do_xattr = B_TRUE;
	}
	if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) {
	atime = B_FALSE;
	do_atime = B_TRUE;
	} else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) {
	atime = B_TRUE;
	do_atime = B_TRUE;
	}

	/*
	* We need to enter pool configuration here, so that we can use
	* dsl_prop_get_int_ds() to handle the special nbmand property below.
	* dsl_prop_get_integer() can not be used, because it has to acquire
	* spa_namespace_lock and we can not do that because we already hold
	* z_teardown_lock. The problem is that spa_write_cachefile() is called
	* with spa_namespace_lock held and the function calls ZFS vnode
	* operations to write the cache file and thus z_teardown_lock is
	* acquired after spa_namespace_lock.
	*/
	ds = dmu_objset_ds(os);
	dsl_pool_config_enter(dmu_objset_pool(os), FTAG);

	/*
	* nbmand is a special property. It can only be changed at
	* mount time.
	*
	* This is weird, but it is documented to only be changeable
	* at mount time.
	*/
	if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) {
	nbmand = B_FALSE;
	} else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) {
	nbmand = B_TRUE;
	} else if ((error = dsl_prop_get_int_ds(ds, "nbmand", &nbmand) != 0)) {
	dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
	return (error);
	}

	/*
	* Register property callbacks.
	*
	* It would probably be fine to just check for i/o error from
	* the first prop_register(), but I guess I like to go
	* overboard...
	*/
	error = dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_ACLTYPE), acl_type_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb,
	zfsvfs);
	error = error ? error : dsl_prop_register(ds,
	zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs);
	dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
	if (error)
	goto unregister;

	/*
	* Invoke our callbacks to restore temporary mount options.
	*/
	if (do_readonly)
	readonly_changed_cb(zfsvfs, readonly);
	if (do_setuid)
	setuid_changed_cb(zfsvfs, setuid);
	if (do_exec)
	exec_changed_cb(zfsvfs, exec);
	if (do_xattr)
	xattr_changed_cb(zfsvfs, xattr);
	if (do_atime)
	atime_changed_cb(zfsvfs, atime);

	nbmand_changed_cb(zfsvfs, nbmand);

	return (0);

	unregister:
	dsl_prop_unregister_all(ds, zfsvfs);
	return (error);
	}

	/*
	* Associate this zfsvfs with the given objset, which must be owned.
	* This will cache a bunch of on-disk state from the objset in the
	* zfsvfs.
	*/
	static int
	zfsvfs_init(zfsvfs_t zfsvfs, objset_t os)
	{
	int error;
	uint64_t val;

	zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE;
	zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
	zfsvfs->z_os = os;

	error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version);
	if (error != 0)
	return (error);
	if (zfsvfs->z_version >
	zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) {
	(void) printf("Can't mount a version %lld file system "
	"on a version %lld pool\n. Pool must be upgraded to mount "
	"this file system.", (u_longlong_t)zfsvfs->z_version,
	(u_longlong_t)spa_version(dmu_objset_spa(os)));
	return (SET_ERROR(ENOTSUP));
	}
	error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &val);
	if (error != 0)
	return (error);
	zfsvfs->z_norm = (int)val;

	error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &val);
	if (error != 0)
	return (error);
	zfsvfs->z_utf8 = (val != 0);

	error = zfs_get_zplprop(os, ZFS_PROP_CASE, &val);
	if (error != 0)
	return (error);
	zfsvfs->z_case = (uint_t)val;

	error = zfs_get_zplprop(os, ZFS_PROP_ACLTYPE, &val);
	if (error != 0)
	return (error);
	zfsvfs->z_acl_type = (uint_t)val;

	/*
	* Fold case on file systems that are always or sometimes case
	* insensitive.
	*/
	if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE \|\|
	zfsvfs->z_case == ZFS_CASE_MIXED)
	zfsvfs->z_norm \|= U8_TEXTPREP_TOUPPER;

	zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
	zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);

	uint64_t sa_obj = 0;
	if (zfsvfs->z_use_sa) {
	/* should either have both of these objects or none */
	error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1,
	&sa_obj);
	if (error != 0)
	return (error);
	+
	+ error = zfs_get_zplprop(os, ZFS_PROP_XATTR, &val);
	+ if (error == 0 && val == ZFS_XATTR_SA)
	+ zfsvfs->z_xattr_sa = B_TRUE;
	}

	error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
	&zfsvfs->z_attr_table);
	if (error != 0)
	return (error);

	if (zfsvfs->z_version >= ZPL_VERSION_SA)
	sa_register_update_callback(os, zfs_sa_upgrade);

	error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
	&zfsvfs->z_root);
	if (error != 0)
	return (error);
	- ASSERT(zfsvfs->z_root != 0);
	+ ASSERT3U(zfsvfs->z_root, !=, 0);

	error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
	&zfsvfs->z_unlinkedobj);
	if (error != 0)
	return (error);

	error = zap_lookup(os, MASTER_NODE_OBJ,
	zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA],
	8, 1, &zfsvfs->z_userquota_obj);
	if (error == ENOENT)
	zfsvfs->z_userquota_obj = 0;
	else if (error != 0)
	return (error);

	error = zap_lookup(os, MASTER_NODE_OBJ,
	zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA],
	8, 1, &zfsvfs->z_groupquota_obj);
	if (error == ENOENT)
	zfsvfs->z_groupquota_obj = 0;
	else if (error != 0)
	return (error);

	error = zap_lookup(os, MASTER_NODE_OBJ,
	zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTQUOTA],
	8, 1, &zfsvfs->z_projectquota_obj);
	if (error == ENOENT)
	zfsvfs->z_projectquota_obj = 0;
	else if (error != 0)
	return (error);

	error = zap_lookup(os, MASTER_NODE_OBJ,
	zfs_userquota_prop_prefixes[ZFS_PROP_USEROBJQUOTA],
	8, 1, &zfsvfs->z_userobjquota_obj);
	if (error == ENOENT)
	zfsvfs->z_userobjquota_obj = 0;
	else if (error != 0)
	return (error);

	error = zap_lookup(os, MASTER_NODE_OBJ,
	zfs_userquota_prop_prefixes[ZFS_PROP_GROUPOBJQUOTA],
	8, 1, &zfsvfs->z_groupobjquota_obj);
	if (error == ENOENT)
	zfsvfs->z_groupobjquota_obj = 0;
	else if (error != 0)
	return (error);

	error = zap_lookup(os, MASTER_NODE_OBJ,
	zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTOBJQUOTA],
	8, 1, &zfsvfs->z_projectobjquota_obj);
	if (error == ENOENT)
	zfsvfs->z_projectobjquota_obj = 0;
	else if (error != 0)
	return (error);

	error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
	&zfsvfs->z_fuid_obj);
	if (error == ENOENT)
	zfsvfs->z_fuid_obj = 0;
	else if (error != 0)
	return (error);

	error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1,
	&zfsvfs->z_shares_dir);
	if (error == ENOENT)
	zfsvfs->z_shares_dir = 0;
	else if (error != 0)
	return (error);

	/*
	* Only use the name cache if we are looking for a
	* name on a file system that does not require normalization
	* or case folding. We can also look there if we happen to be
	* on a non-normalizing, mixed sensitivity file system IF we
	* are looking for the exact name (which is always the case on
	* FreeBSD).
	*/
	zfsvfs->z_use_namecache = !zfsvfs->z_norm \|\|
	((zfsvfs->z_case == ZFS_CASE_MIXED) &&
	!(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER));

	return (0);
	}

	taskq_t *zfsvfs_taskq;

	static void
	zfsvfs_task_unlinked_drain(void *context, int pending __unused)
	{

	zfs_unlinked_drain((zfsvfs_t *)context);
	}

	int
	zfsvfs_create(const char osname, boolean_t readonly, zfsvfs_t *zfvp)
	{
	objset_t *os;
	zfsvfs_t *zfsvfs;
	int error;
	boolean_t ro = (readonly \|\| (strchr(osname, '@') != NULL));

	/*
	* XXX: Fix struct statfs so this isn't necessary!
	*
	* The 'osname' is used as the filesystem's special node, which means
	* it must fit in statfs.f_mntfromname, or else it can't be
	* enumerated, so libzfs_mnttab_find() returns NULL, which causes
	* 'zfs unmount' to think it's not mounted when it is.
	*/
	if (strlen(osname) >= MNAMELEN)
	return (SET_ERROR(ENAMETOOLONG));

	zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);

	error = dmu_objset_own(osname, DMU_OST_ZFS, ro, B_TRUE, zfsvfs,
	&os);
	if (error != 0) {
	kmem_free(zfsvfs, sizeof (zfsvfs_t));
	return (error);
	}

	error = zfsvfs_create_impl(zfvp, zfsvfs, os);

	return (error);
	}


	int
	zfsvfs_create_impl(zfsvfs_t *zfvp, zfsvfs_t zfsvfs, objset_t *os)
	{
	int error;

	zfsvfs->z_vfs = NULL;
	zfsvfs->z_parent = zfsvfs;

	mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
	offsetof(znode_t, z_link_node));
	TASK_INIT(&zfsvfs->z_unlinked_drain_task, 0,
	zfsvfs_task_unlinked_drain, zfsvfs);
	ZFS_TEARDOWN_INIT(zfsvfs);
	ZFS_TEARDOWN_INACTIVE_INIT(zfsvfs);
	rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL);
	for (int i = 0; i != ZFS_OBJ_MTX_SZ; i++)
	mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);

	error = zfsvfs_init(zfsvfs, os);
	if (error != 0) {
	dmu_objset_disown(os, B_TRUE, zfsvfs);
	*zfvp = NULL;
	kmem_free(zfsvfs, sizeof (zfsvfs_t));
	return (error);
	}

	*zfvp = zfsvfs;
	return (0);
	}

	static int
	zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
	{
	int error;

	/*
	* Check for a bad on-disk format version now since we
	* lied about owning the dataset readonly before.
	*/
	if (!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) &&
	dmu_objset_incompatible_encryption_version(zfsvfs->z_os))
	return (SET_ERROR(EROFS));

	error = zfs_register_callbacks(zfsvfs->z_vfs);
	if (error)
	return (error);

	zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);

	/*
	* If we are not mounting (ie: online recv), then we don't
	* have to worry about replaying the log as we blocked all
	* operations out since we closed the ZIL.
	*/
	if (mounting) {
	boolean_t readonly;

	ASSERT3P(zfsvfs->z_kstat.dk_kstats, ==, NULL);
	dataset_kstats_create(&zfsvfs->z_kstat, zfsvfs->z_os);

	/*
	* During replay we remove the read only flag to
	* allow replays to succeed.
	*/
	readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY;
	if (readonly != 0) {
	zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
	} else {
	dsl_dir_t *dd;
	zap_stats_t zs;

	if (zap_get_stats(zfsvfs->z_os, zfsvfs->z_unlinkedobj,
	&zs) == 0) {
	dataset_kstats_update_nunlinks_kstat(
	&zfsvfs->z_kstat, zs.zs_num_entries);
	dprintf_ds(zfsvfs->z_os->os_dsl_dataset,
	"num_entries in unlinked set: %llu",
	(u_longlong_t)zs.zs_num_entries);
	}

	zfs_unlinked_drain(zfsvfs);
	dd = zfsvfs->z_os->os_dsl_dataset->ds_dir;
	dd->dd_activity_cancelled = B_FALSE;
	}

	/*
	* Parse and replay the intent log.
	*
	* Because of ziltest, this must be done after
	* zfs_unlinked_drain(). (Further note: ziltest
	* doesn't use readonly mounts, where
	* zfs_unlinked_drain() isn't called.) This is because
	* ziltest causes spa_sync() to think it's committed,
	* but actually it is not, so the intent log contains
	* many txg's worth of changes.
	*
	* In particular, if object N is in the unlinked set in
	* the last txg to actually sync, then it could be
	* actually freed in a later txg and then reallocated
	* in a yet later txg. This would write a "create
	* object N" record to the intent log. Normally, this
	* would be fine because the spa_sync() would have
	* written out the fact that object N is free, before
	* we could write the "create object N" intent log
	* record.
	*
	* But when we are in ziltest mode, we advance the "open
	* txg" without actually spa_sync()-ing the changes to
	* disk. So we would see that object N is still
	* allocated and in the unlinked set, and there is an
	* intent log record saying to allocate it.
	*/
	if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) {
	if (zil_replay_disable) {
	zil_destroy(zfsvfs->z_log, B_FALSE);
	} else {
	boolean_t use_nc = zfsvfs->z_use_namecache;
	zfsvfs->z_use_namecache = B_FALSE;
	zfsvfs->z_replay = B_TRUE;
	zil_replay(zfsvfs->z_os, zfsvfs,
	zfs_replay_vector);
	zfsvfs->z_replay = B_FALSE;
	zfsvfs->z_use_namecache = use_nc;
	}
	}

	/* restore readonly bit */
	if (readonly != 0)
	zfsvfs->z_vfs->vfs_flag \|= VFS_RDONLY;
	}

	/*
	* Set the objset user_ptr to track its zfsvfs.
	*/
	mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
	dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
	mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);

	return (0);
	}

	void
	zfsvfs_free(zfsvfs_t *zfsvfs)
	{
	int i;

	zfs_fuid_destroy(zfsvfs);

	mutex_destroy(&zfsvfs->z_znodes_lock);
	mutex_destroy(&zfsvfs->z_lock);
	- ASSERT(zfsvfs->z_nr_znodes == 0);
	+ ASSERT3U(zfsvfs->z_nr_znodes, ==, 0);
	list_destroy(&zfsvfs->z_all_znodes);
	ZFS_TEARDOWN_DESTROY(zfsvfs);
	ZFS_TEARDOWN_INACTIVE_DESTROY(zfsvfs);
	rw_destroy(&zfsvfs->z_fuid_lock);
	for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
	mutex_destroy(&zfsvfs->z_hold_mtx[i]);
	dataset_kstats_destroy(&zfsvfs->z_kstat);
	kmem_free(zfsvfs, sizeof (zfsvfs_t));
	}

	static void
	zfs_set_fuid_feature(zfsvfs_t *zfsvfs)
	{
	zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
	if (zfsvfs->z_vfs) {
	if (zfsvfs->z_use_fuids) {
	vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
	vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
	vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
	vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
	vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
	vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
	} else {
	vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
	vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
	vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
	vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
	vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
	vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
	}
	}
	zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
	}

	static int
	zfs_domount(vfs_t vfsp, char osname)
	{
	uint64_t recordsize, fsid_guid;
	int error = 0;
	zfsvfs_t *zfsvfs;

	- ASSERT(vfsp);
	- ASSERT(osname);
	+ ASSERT3P(vfsp, !=, NULL);
	+ ASSERT3P(osname, !=, NULL);

	error = zfsvfs_create(osname, vfsp->mnt_flag & MNT_RDONLY, &zfsvfs);
	if (error)
	return (error);
	zfsvfs->z_vfs = vfsp;

	if ((error = dsl_prop_get_integer(osname,
	"recordsize", &recordsize, NULL)))
	goto out;
	zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE;
	zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize;

	vfsp->vfs_data = zfsvfs;
	vfsp->mnt_flag \|= MNT_LOCAL;
	vfsp->mnt_kern_flag \|= MNTK_LOOKUP_SHARED;
	vfsp->mnt_kern_flag \|= MNTK_SHARED_WRITES;
	vfsp->mnt_kern_flag \|= MNTK_EXTENDED_SHARED;
	/*
	* This can cause a loss of coherence between ARC and page cache
	* on ZoF - unclear if the problem is in FreeBSD or ZoF
	*/
	vfsp->mnt_kern_flag \|= MNTK_NO_IOPF; /* vn_io_fault can be used */
	vfsp->mnt_kern_flag \|= MNTK_NOMSYNC;
	vfsp->mnt_kern_flag \|= MNTK_VMSETSIZE_BUG;

	#if defined(_KERNEL) && !defined(KMEM_DEBUG)
	vfsp->mnt_kern_flag \|= MNTK_FPLOOKUP;
	#endif
	/*
	* The fsid is 64 bits, composed of an 8-bit fs type, which
	* separates our fsid from any other filesystem types, and a
	* 56-bit objset unique ID. The objset unique ID is unique to
	* all objsets open on this system, provided by unique_create().
	* The 8-bit fs type must be put in the low bits of fsid[1]
	* because that's where other Solaris filesystems put it.
	*/
	fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os);
	- ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
	+ ASSERT3U((fsid_guid & ~((1ULL << 56) - 1)), ==, 0);
	vfsp->vfs_fsid.val[0] = fsid_guid;
	- vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) \|
	+ vfsp->vfs_fsid.val[1] = ((fsid_guid >> 32) << 8) \|
	(vfsp->mnt_vfc->vfc_typenum & 0xFF);

	/*
	* Set features for file system.
	*/
	zfs_set_fuid_feature(zfsvfs);
	if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
	vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
	vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
	vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE);
	} else if (zfsvfs->z_case == ZFS_CASE_MIXED) {
	vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
	vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
	}
	vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED);

	if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
	uint64_t pval;

	atime_changed_cb(zfsvfs, B_FALSE);
	readonly_changed_cb(zfsvfs, B_TRUE);
	if ((error = dsl_prop_get_integer(osname,
	"xattr", &pval, NULL)))
	goto out;
	xattr_changed_cb(zfsvfs, pval);
	if ((error = dsl_prop_get_integer(osname,
	"acltype", &pval, NULL)))
	goto out;
	acl_type_changed_cb(zfsvfs, pval);
	zfsvfs->z_issnap = B_TRUE;
	zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED;

	mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
	dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
	mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
	} else {
	if ((error = zfsvfs_setup(zfsvfs, B_TRUE)))
	goto out;
	}

	vfs_mountedfrom(vfsp, osname);

	if (!zfsvfs->z_issnap)
	zfsctl_create(zfsvfs);
	out:
	if (error) {
	dmu_objset_disown(zfsvfs->z_os, B_TRUE, zfsvfs);
	zfsvfs_free(zfsvfs);
	} else {
	atomic_inc_32(&zfs_active_fs_count);
	}

	return (error);
	}

	static void
	zfs_unregister_callbacks(zfsvfs_t *zfsvfs)
	{
	objset_t *os = zfsvfs->z_os;

	if (!dmu_objset_is_snapshot(os))
	dsl_prop_unregister_all(dmu_objset_ds(os), zfsvfs);
	}

	static int
	getpoolname(const char osname, char poolname)
	{
	char *p;

	p = strchr(osname, '/');
	if (p == NULL) {
	if (strlen(osname) >= MAXNAMELEN)
	return (ENAMETOOLONG);
	(void) strcpy(poolname, osname);
	} else {
	if (p - osname >= MAXNAMELEN)
	return (ENAMETOOLONG);
	(void) strncpy(poolname, osname, p - osname);
	poolname[p - osname] = '\0';
	}
	return (0);
	}

	static void
	fetch_osname_options(char name, bool checkpointrewind)
	{

	if (name[0] == '!') {
	*checkpointrewind = true;
	memmove(name, name + 1, strlen(name));
	} else {
	*checkpointrewind = false;
	}
	}

	/ARGSUSED/
	static int
	zfs_mount(vfs_t *vfsp)
	{
	kthread_t *td = curthread;
	vnode_t *mvp = vfsp->mnt_vnodecovered;
	cred_t *cr = td->td_ucred;
	char *osname;
	int error = 0;
	int canwrite;
	bool checkpointrewind;

	if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL))
	return (SET_ERROR(EINVAL));

	/*
	* If full-owner-access is enabled and delegated administration is
	* turned on, we must set nosuid.
	*/
	if (zfs_super_owner &&
	dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) {
	secpolicy_fs_mount_clearopts(cr, vfsp);
	}

	fetch_osname_options(osname, &checkpointrewind);

	/*
	* Check for mount privilege?
	*
	* If we don't have privilege then see if
	* we have local permission to allow it
	*/
	error = secpolicy_fs_mount(cr, mvp, vfsp);
	if (error) {
	if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0)
	goto out;

	if (!(vfsp->vfs_flag & MS_REMOUNT)) {
	vattr_t vattr;

	/*
	* Make sure user is the owner of the mount point
	* or has sufficient privileges.
	*/

	vattr.va_mask = AT_UID;

	vn_lock(mvp, LK_SHARED \| LK_RETRY);
	if (VOP_GETATTR(mvp, &vattr, cr)) {
	VOP_UNLOCK1(mvp);
	goto out;
	}

	if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 &&
	VOP_ACCESS(mvp, VWRITE, cr, td) != 0) {
	VOP_UNLOCK1(mvp);
	goto out;
	}
	VOP_UNLOCK1(mvp);
	}

	secpolicy_fs_mount_clearopts(cr, vfsp);
	}

	/*
	* Refuse to mount a filesystem if we are in a local zone and the
	* dataset is not visible.
	*/
	if (!INGLOBALZONE(curproc) &&
	(!zone_dataset_visible(osname, &canwrite) \|\| !canwrite)) {
	error = SET_ERROR(EPERM);
	goto out;
	}

	vfsp->vfs_flag \|= MNT_NFS4ACLS;

	/*
	* When doing a remount, we simply refresh our temporary properties
	* according to those options set in the current VFS options.
	*/
	if (vfsp->vfs_flag & MS_REMOUNT) {
	zfsvfs_t *zfsvfs = vfsp->vfs_data;

	/*
	* Refresh mount options with z_teardown_lock blocking I/O while
	* the filesystem is in an inconsistent state.
	* The lock also serializes this code with filesystem
	* manipulations between entry to zfs_suspend_fs() and return
	* from zfs_resume_fs().
	*/
	ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, FTAG);
	zfs_unregister_callbacks(zfsvfs);
	error = zfs_register_callbacks(vfsp);
	ZFS_TEARDOWN_EXIT(zfsvfs, FTAG);
	goto out;
	}

	/* Initial root mount: try hard to import the requested root pool. */
	if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 &&
	(vfsp->vfs_flag & MNT_UPDATE) == 0) {
	char pname[MAXNAMELEN];

	error = getpoolname(osname, pname);
	if (error == 0)
	error = spa_import_rootpool(pname, checkpointrewind);
	if (error)
	goto out;
	}
	DROP_GIANT();
	error = zfs_domount(vfsp, osname);
	PICKUP_GIANT();

	out:
	return (error);
	}

	static int
	zfs_statfs(vfs_t vfsp, struct statfs statp)
	{
	zfsvfs_t *zfsvfs = vfsp->vfs_data;
	uint64_t refdbytes, availbytes, usedobjs, availobjs;

	statp->f_version = STATFS_VERSION;

	ZFS_ENTER(zfsvfs);

	dmu_objset_space(zfsvfs->z_os,
	&refdbytes, &availbytes, &usedobjs, &availobjs);

	/*
	* The underlying storage pool actually uses multiple block sizes.
	* We report the fragsize as the smallest block size we support,
	* and we report our blocksize as the filesystem's maximum blocksize.
	*/
	statp->f_bsize = SPA_MINBLOCKSIZE;
	statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize;

	/*
	* The following report "total" blocks of various kinds in the
	* file system, but reported in terms of f_frsize - the
	* "fragment" size.
	*/

	statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT;
	statp->f_bfree = availbytes / statp->f_bsize;
	statp->f_bavail = statp->f_bfree; /* no root reservation */

	/*
	* statvfs() should really be called statufs(), because it assumes
	* static metadata. ZFS doesn't preallocate files, so the best
	* we can do is report the max that could possibly fit in f_files,
	* and that minus the number actually used in f_ffree.
	* For f_ffree, report the smaller of the number of object available
	* and the number of blocks (each object will take at least a block).
	*/
	statp->f_ffree = MIN(availobjs, statp->f_bfree);
	statp->f_files = statp->f_ffree + usedobjs;

	/*
	* We're a zfs filesystem.
	*/
	strlcpy(statp->f_fstypename, "zfs",
	sizeof (statp->f_fstypename));

	strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname,
	sizeof (statp->f_mntfromname));
	strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname,
	sizeof (statp->f_mntonname));

	statp->f_namemax = MAXNAMELEN - 1;

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	static int
	zfs_root(vfs_t vfsp, int flags, vnode_t *vpp)
	{
	zfsvfs_t *zfsvfs = vfsp->vfs_data;
	znode_t *rootzp;
	int error;

	ZFS_ENTER(zfsvfs);

	error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp);
	if (error == 0)
	*vpp = ZTOV(rootzp);

	ZFS_EXIT(zfsvfs);

	if (error == 0) {
	error = vn_lock(*vpp, flags);
	if (error != 0) {
	VN_RELE(*vpp);
	*vpp = NULL;
	}
	}
	return (error);
	}

	/*
	* Teardown the zfsvfs::z_os.
	*
	* Note, if 'unmounting' is FALSE, we return with the 'z_teardown_lock'
	* and 'z_teardown_inactive_lock' held.
	*/
	static int
	zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
	{
	znode_t *zp;
	dsl_dir_t *dd;

	/*
	* If someone has not already unmounted this file system,
	* drain the zrele_taskq to ensure all active references to the
	* zfsvfs_t have been handled only then can it be safely destroyed.
	*/
	if (zfsvfs->z_os) {
	/*
	* If we're unmounting we have to wait for the list to
	* drain completely.
	*
	* If we're not unmounting there's no guarantee the list
	* will drain completely, but zreles run from the taskq
	* may add the parents of dir-based xattrs to the taskq
	* so we want to wait for these.
	*
	* We can safely read z_nr_znodes without locking because the
	* VFS has already blocked operations which add to the
	* z_all_znodes list and thus increment z_nr_znodes.
	*/
	int round = 0;
	while (zfsvfs->z_nr_znodes > 0) {
	taskq_wait_outstanding(dsl_pool_zrele_taskq(
	dmu_objset_pool(zfsvfs->z_os)), 0);
	if (++round > 1 && !unmounting)
	break;
	}
	}
	ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, FTAG);

	if (!unmounting) {
	/*
	* We purge the parent filesystem's vfsp as the parent
	* filesystem and all of its snapshots have their vnode's
	* v_vfsp set to the parent's filesystem's vfsp. Note,
	* 'z_parent' is self referential for non-snapshots.
	*/
	#ifdef FREEBSD_NAMECACHE
	#if __FreeBSD_version >= 1300117
	cache_purgevfs(zfsvfs->z_parent->z_vfs);
	#else
	cache_purgevfs(zfsvfs->z_parent->z_vfs, true);
	#endif
	#endif
	}

	/*
	* Close the zil. NB: Can't close the zil while zfs_inactive
	* threads are blocked as zil_close can call zfs_inactive.
	*/
	if (zfsvfs->z_log) {
	zil_close(zfsvfs->z_log);
	zfsvfs->z_log = NULL;
	}

	ZFS_TEARDOWN_INACTIVE_ENTER_WRITE(zfsvfs);

	/*
	* If we are not unmounting (ie: online recv) and someone already
	* unmounted this file system while we were doing the switcheroo,
	* or a reopen of z_os failed then just bail out now.
	*/
	if (!unmounting && (zfsvfs->z_unmounted \|\| zfsvfs->z_os == NULL)) {
	ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs);
	ZFS_TEARDOWN_EXIT(zfsvfs, FTAG);
	return (SET_ERROR(EIO));
	}

	/*
	* At this point there are no vops active, and any new vops will
	* fail with EIO since we have z_teardown_lock for writer (only
	* relevant for forced unmount).
	*
	* Release all holds on dbufs.
	*/
	mutex_enter(&zfsvfs->z_znodes_lock);
	for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL;
	- zp = list_next(&zfsvfs->z_all_znodes, zp))
	- if (zp->z_sa_hdl) {
	- ASSERT(ZTOV(zp)->v_usecount >= 0);
	+ zp = list_next(&zfsvfs->z_all_znodes, zp)) {
	+ if (zp->z_sa_hdl != NULL) {
	zfs_znode_dmu_fini(zp);
	}
	+ }
	mutex_exit(&zfsvfs->z_znodes_lock);

	/*
	* If we are unmounting, set the unmounted flag and let new vops
	* unblock. zfs_inactive will have the unmounted behavior, and all
	* other vops will fail with EIO.
	*/
	if (unmounting) {
	zfsvfs->z_unmounted = B_TRUE;
	ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs);
	ZFS_TEARDOWN_EXIT(zfsvfs, FTAG);
	}

	/*
	* z_os will be NULL if there was an error in attempting to reopen
	* zfsvfs, so just return as the properties had already been
	* unregistered and cached data had been evicted before.
	*/
	if (zfsvfs->z_os == NULL)
	return (0);

	/*
	* Unregister properties.
	*/
	zfs_unregister_callbacks(zfsvfs);

	/*
	* Evict cached data
	*/
	if (!zfs_is_readonly(zfsvfs))
	txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
	dmu_objset_evict_dbufs(zfsvfs->z_os);
	dd = zfsvfs->z_os->os_dsl_dataset->ds_dir;
	dsl_dir_cancel_waiters(dd);

	return (0);
	}

	/ARGSUSED/
	static int
	zfs_umount(vfs_t *vfsp, int fflag)
	{
	kthread_t *td = curthread;
	zfsvfs_t *zfsvfs = vfsp->vfs_data;
	objset_t *os;
	cred_t *cr = td->td_ucred;
	int ret;

	ret = secpolicy_fs_unmount(cr, vfsp);
	if (ret) {
	if (dsl_deleg_access((char *)vfsp->vfs_resource,
	ZFS_DELEG_PERM_MOUNT, cr))
	return (ret);
	}

	/*
	* Unmount any snapshots mounted under .zfs before unmounting the
	* dataset itself.
	*/
	if (zfsvfs->z_ctldir != NULL) {
	if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0)
	return (ret);
	}

	if (fflag & MS_FORCE) {
	/*
	* Mark file system as unmounted before calling
	* vflush(FORCECLOSE). This way we ensure no future vnops
	* will be called and risk operating on DOOMED vnodes.
	*/
	ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, FTAG);
	zfsvfs->z_unmounted = B_TRUE;
	ZFS_TEARDOWN_EXIT(zfsvfs, FTAG);
	}

	/*
	* Flush all the files.
	*/
	ret = vflush(vfsp, 0, (fflag & MS_FORCE) ? FORCECLOSE : 0, td);
	if (ret != 0)
	return (ret);
	while (taskqueue_cancel(zfsvfs_taskq->tq_queue,
	&zfsvfs->z_unlinked_drain_task, NULL) != 0)
	taskqueue_drain(zfsvfs_taskq->tq_queue,
	&zfsvfs->z_unlinked_drain_task);

	- VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0);
	+ VERIFY0(zfsvfs_teardown(zfsvfs, B_TRUE));
	os = zfsvfs->z_os;

	/*
	* z_os will be NULL if there was an error in
	* attempting to reopen zfsvfs.
	*/
	if (os != NULL) {
	/*
	* Unset the objset user_ptr.
	*/
	mutex_enter(&os->os_user_ptr_lock);
	dmu_objset_set_user(os, NULL);
	mutex_exit(&os->os_user_ptr_lock);

	/*
	* Finally release the objset
	*/
	dmu_objset_disown(os, B_TRUE, zfsvfs);
	}

	/*
	* We can now safely destroy the '.zfs' directory node.
	*/
	if (zfsvfs->z_ctldir != NULL)
	zfsctl_destroy(zfsvfs);
	zfs_freevfs(vfsp);

	return (0);
	}

	static int
	zfs_vget(vfs_t vfsp, ino_t ino, int flags, vnode_t *vpp)
	{
	zfsvfs_t *zfsvfs = vfsp->vfs_data;
	znode_t *zp;
	int err;

	/*
	* zfs_zget() can't operate on virtual entries like .zfs/ or
	* .zfs/snapshot/ directories, that's why we return EOPNOTSUPP.
	* This will make NFS to switch to LOOKUP instead of using VGET.
	*/
	if (ino == ZFSCTL_INO_ROOT \|\| ino == ZFSCTL_INO_SNAPDIR \|\|
	(zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir))
	return (EOPNOTSUPP);

	ZFS_ENTER(zfsvfs);
	err = zfs_zget(zfsvfs, ino, &zp);
	if (err == 0 && zp->z_unlinked) {
	vrele(ZTOV(zp));
	err = EINVAL;
	}
	if (err == 0)
	*vpp = ZTOV(zp);
	ZFS_EXIT(zfsvfs);
	if (err == 0) {
	err = vn_lock(*vpp, flags);
	if (err != 0)
	vrele(*vpp);
	}
	if (err != 0)
	*vpp = NULL;
	return (err);
	}

	static int
	#if __FreeBSD_version >= 1300098
	zfs_checkexp(vfs_t vfsp, struct sockaddr nam, uint64_t *extflagsp,
	struct ucred *credanonp, int numsecflavors, int *secflavors)
	#else
	zfs_checkexp(vfs_t vfsp, struct sockaddr nam, int *extflagsp,
	struct ucred *credanonp, int numsecflavors, int **secflavors)
	#endif
	{
	zfsvfs_t *zfsvfs = vfsp->vfs_data;

	/*
	* If this is regular file system vfsp is the same as
	* zfsvfs->z_parent->z_vfs, but if it is snapshot,
	* zfsvfs->z_parent->z_vfs represents parent file system
	* which we have to use here, because only this file system
	* has mnt_export configured.
	*/
	return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp,
	credanonp, numsecflavors, secflavors));
	}

	CTASSERT(SHORT_FID_LEN <= sizeof (struct fid));
	CTASSERT(LONG_FID_LEN <= sizeof (struct fid));

	static int
	zfs_fhtovp(vfs_t vfsp, fid_t fidp, int flags, vnode_t **vpp)
	{
	struct componentname cn;
	zfsvfs_t *zfsvfs = vfsp->vfs_data;
	znode_t *zp;
	vnode_t *dvp;
	uint64_t object = 0;
	uint64_t fid_gen = 0;
	uint64_t gen_mask;
	uint64_t zp_gen;
	int i, err;

	*vpp = NULL;

	ZFS_ENTER(zfsvfs);

	/*
	* On FreeBSD we can get snapshot's mount point or its parent file
	* system mount point depending if snapshot is already mounted or not.
	*/
	if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) {
	zfid_long_t zlfid = (zfid_long_t )fidp;
	uint64_t objsetid = 0;
	uint64_t setgen = 0;

	for (i = 0; i < sizeof (zlfid->zf_setid); i++)
	objsetid \|= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);

	for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
	setgen \|= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);

	ZFS_EXIT(zfsvfs);

	err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs);
	if (err)
	return (SET_ERROR(EINVAL));
	ZFS_ENTER(zfsvfs);
	}

	if (fidp->fid_len == SHORT_FID_LEN \|\| fidp->fid_len == LONG_FID_LEN) {
	zfid_short_t zfid = (zfid_short_t )fidp;

	for (i = 0; i < sizeof (zfid->zf_object); i++)
	object \|= ((uint64_t)zfid->zf_object[i]) << (8 * i);

	for (i = 0; i < sizeof (zfid->zf_gen); i++)
	fid_gen \|= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
	} else {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	/*
	* A zero fid_gen means we are in .zfs or the .zfs/snapshot
	* directory tree. If the object == zfsvfs->z_shares_dir, then
	* we are in the .zfs/shares directory tree.
	*/
	if ((fid_gen == 0 &&
	(object == ZFSCTL_INO_ROOT \|\| object == ZFSCTL_INO_SNAPDIR)) \|\|
	(zfsvfs->z_shares_dir != 0 && object == zfsvfs->z_shares_dir)) {
	ZFS_EXIT(zfsvfs);
	VERIFY0(zfsctl_root(zfsvfs, LK_SHARED, &dvp));
	if (object == ZFSCTL_INO_SNAPDIR) {
	cn.cn_nameptr = "snapshot";
	cn.cn_namelen = strlen(cn.cn_nameptr);
	cn.cn_nameiop = LOOKUP;
	cn.cn_flags = ISLASTCN \| LOCKLEAF;
	cn.cn_lkflags = flags;
	VERIFY0(VOP_LOOKUP(dvp, vpp, &cn));
	vput(dvp);
	} else if (object == zfsvfs->z_shares_dir) {
	/*
	* XXX This branch must not be taken,
	* if it is, then the lookup below will
	* explode.
	*/
	cn.cn_nameptr = "shares";
	cn.cn_namelen = strlen(cn.cn_nameptr);
	cn.cn_nameiop = LOOKUP;
	cn.cn_flags = ISLASTCN;
	cn.cn_lkflags = flags;
	VERIFY0(VOP_LOOKUP(dvp, vpp, &cn));
	vput(dvp);
	} else {
	*vpp = dvp;
	}
	return (err);
	}

	gen_mask = -1ULL >> (64 - 8 * i);

	dprintf("getting %llu [%llu mask %llx]\n", (u_longlong_t)object,
	(u_longlong_t)fid_gen,
	(u_longlong_t)gen_mask);
	if ((err = zfs_zget(zfsvfs, object, &zp))) {
	ZFS_EXIT(zfsvfs);
	return (err);
	}
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen,
	sizeof (uint64_t));
	zp_gen = zp_gen & gen_mask;
	if (zp_gen == 0)
	zp_gen = 1;
	if (zp->z_unlinked \|\| zp_gen != fid_gen) {
	dprintf("znode gen (%llu) != fid gen (%llu)\n",
	(u_longlong_t)zp_gen, (u_longlong_t)fid_gen);
	vrele(ZTOV(zp));
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	*vpp = ZTOV(zp);
	ZFS_EXIT(zfsvfs);
	err = vn_lock(*vpp, flags);
	if (err == 0)
	vnode_create_vobject(*vpp, zp->z_size, curthread);
	else
	*vpp = NULL;
	return (err);
	}

	/*
	* Block out VOPs and close zfsvfs_t::z_os
	*
	* Note, if successful, then we return with the 'z_teardown_lock' and
	* 'z_teardown_inactive_lock' write held. We leave ownership of the underlying
	* dataset and objset intact so that they can be atomically handed off during
	* a subsequent rollback or recv operation and the resume thereafter.
	*/
	int
	zfs_suspend_fs(zfsvfs_t *zfsvfs)
	{
	int error;

	if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0)
	return (error);

	return (0);
	}

	/*
	* Rebuild SA and release VOPs. Note that ownership of the underlying dataset
	* is an invariant across any of the operations that can be performed while the
	* filesystem was suspended. Whether it succeeded or failed, the preconditions
	* are the same: the relevant objset and associated dataset are owned by
	* zfsvfs, held, and long held on entry.
	*/
	int
	zfs_resume_fs(zfsvfs_t zfsvfs, dsl_dataset_t ds)
	{
	int err;
	znode_t *zp;

	ASSERT(ZFS_TEARDOWN_WRITE_HELD(zfsvfs));
	ASSERT(ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zfsvfs));

	/*
	* We already own this, so just update the objset_t, as the one we
	* had before may have been evicted.
	*/
	objset_t *os;
	VERIFY3P(ds->ds_owner, ==, zfsvfs);
	VERIFY(dsl_dataset_long_held(ds));
	dsl_pool_t *dp = spa_get_dsl(dsl_dataset_get_spa(ds));
	dsl_pool_config_enter(dp, FTAG);
	VERIFY0(dmu_objset_from_ds(ds, &os));
	dsl_pool_config_exit(dp, FTAG);

	err = zfsvfs_init(zfsvfs, os);
	if (err != 0)
	goto bail;

	ds->ds_dir->dd_activity_cancelled = B_FALSE;
	- VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0);
	+ VERIFY0(zfsvfs_setup(zfsvfs, B_FALSE));

	zfs_set_fuid_feature(zfsvfs);

	/*
	* Attempt to re-establish all the active znodes with
	* their dbufs. If a zfs_rezget() fails, then we'll let
	* any potential callers discover that via ZFS_ENTER_VERIFY_VP
	* when they try to use their znode.
	*/
	mutex_enter(&zfsvfs->z_znodes_lock);
	for (zp = list_head(&zfsvfs->z_all_znodes); zp;
	zp = list_next(&zfsvfs->z_all_znodes, zp)) {
	(void) zfs_rezget(zp);
	}
	mutex_exit(&zfsvfs->z_znodes_lock);

	bail:
	/* release the VOPs */
	ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs);
	ZFS_TEARDOWN_EXIT(zfsvfs, FTAG);

	if (err) {
	/*
	* Since we couldn't setup the sa framework, try to force
	* unmount this file system.
	*/
	if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) {
	vfs_ref(zfsvfs->z_vfs);
	(void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread);
	}
	}
	return (err);
	}

	static void
	zfs_freevfs(vfs_t *vfsp)
	{
	zfsvfs_t *zfsvfs = vfsp->vfs_data;

	zfsvfs_free(zfsvfs);

	atomic_dec_32(&zfs_active_fs_count);
	}

	#ifdef __i386__
	static int desiredvnodes_backup;
	#include <sys/vmmeter.h>


	#include <vm/vm_page.h>
	#include <vm/vm_object.h>
	#include <vm/vm_kern.h>
	#include <vm/vm_map.h>
	#endif

	static void
	zfs_vnodes_adjust(void)
	{
	#ifdef __i386__
	int newdesiredvnodes;

	desiredvnodes_backup = desiredvnodes;

	/*
	* We calculate newdesiredvnodes the same way it is done in
	* vntblinit(). If it is equal to desiredvnodes, it means that
	* it wasn't tuned by the administrator and we can tune it down.
	*/
	newdesiredvnodes = min(maxproc + vm_cnt.v_page_count / 4, 2 *
	vm_kmem_size / (5 * (sizeof (struct vm_object) +
	sizeof (struct vnode))));
	if (newdesiredvnodes == desiredvnodes)
	desiredvnodes = (3 * newdesiredvnodes) / 4;
	#endif
	}

	static void
	zfs_vnodes_adjust_back(void)
	{

	#ifdef __i386__
	desiredvnodes = desiredvnodes_backup;
	#endif
	}

	void
	zfs_init(void)
	{

	printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n");

	/*
	* Initialize .zfs directory structures
	*/
	zfsctl_init();

	/*
	* Initialize znode cache, vnode ops, etc...
	*/
	zfs_znode_init();

	/*
	* Reduce number of vnodes. Originally number of vnodes is calculated
	* with UFS inode in mind. We reduce it here, because it's too big for
	* ZFS/i386.
	*/
	zfs_vnodes_adjust();

	dmu_objset_register_type(DMU_OST_ZFS, zpl_get_file_info);

	zfsvfs_taskq = taskq_create("zfsvfs", 1, minclsyspri, 0, 0, 0);
	}

	void
	zfs_fini(void)
	{
	taskq_destroy(zfsvfs_taskq);
	zfsctl_fini();
	zfs_znode_fini();
	zfs_vnodes_adjust_back();
	}

	int
	zfs_busy(void)
	{
	return (zfs_active_fs_count != 0);
	}

	/*
	* Release VOPs and unmount a suspended filesystem.
	*/
	int
	zfs_end_fs(zfsvfs_t zfsvfs, dsl_dataset_t ds)
	{
	ASSERT(ZFS_TEARDOWN_WRITE_HELD(zfsvfs));
	ASSERT(ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zfsvfs));

	/*
	* We already own this, so just hold and rele it to update the
	* objset_t, as the one we had before may have been evicted.
	*/
	objset_t *os;
	VERIFY3P(ds->ds_owner, ==, zfsvfs);
	VERIFY(dsl_dataset_long_held(ds));
	dsl_pool_t *dp = spa_get_dsl(dsl_dataset_get_spa(ds));
	dsl_pool_config_enter(dp, FTAG);
	VERIFY0(dmu_objset_from_ds(ds, &os));
	dsl_pool_config_exit(dp, FTAG);
	zfsvfs->z_os = os;

	/* release the VOPs */
	ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs);
	ZFS_TEARDOWN_EXIT(zfsvfs, FTAG);

	/*
	* Try to force unmount this file system.
	*/
	(void) zfs_umount(zfsvfs->z_vfs, 0);
	zfsvfs->z_unmounted = B_TRUE;
	return (0);
	}

	int
	zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers)
	{
	int error;
	objset_t *os = zfsvfs->z_os;
	dmu_tx_t *tx;

	if (newvers < ZPL_VERSION_INITIAL \|\| newvers > ZPL_VERSION)
	return (SET_ERROR(EINVAL));

	if (newvers < zfsvfs->z_version)
	return (SET_ERROR(EINVAL));

	if (zfs_spa_version_map(newvers) >
	spa_version(dmu_objset_spa(zfsvfs->z_os)))
	return (SET_ERROR(ENOTSUP));

	tx = dmu_tx_create(os);
	dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR);
	if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
	dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
	ZFS_SA_ATTRS);
	dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
	}
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	return (error);
	}

	error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
	8, 1, &newvers, tx);

	if (error) {
	dmu_tx_commit(tx);
	return (error);
	}

	if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
	uint64_t sa_obj;

	ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=,
	SPA_VERSION_SA);
	sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
	DMU_OT_NONE, 0, tx);

	error = zap_add(os, MASTER_NODE_OBJ,
	ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
	ASSERT0(error);

	- VERIFY(0 == sa_set_sa_object(os, sa_obj));
	+ VERIFY0(sa_set_sa_object(os, sa_obj));
	sa_register_update_callback(os, zfs_sa_upgrade);
	}

	spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx,
	"from %ju to %ju", (uintmax_t)zfsvfs->z_version,
	(uintmax_t)newvers);
	dmu_tx_commit(tx);

	zfsvfs->z_version = newvers;
	os->os_version = newvers;

	zfs_set_fuid_feature(zfsvfs);

	return (0);
	}

	/*
	* Read a property stored within the master node.
	*/
	int
	zfs_get_zplprop(objset_t os, zfs_prop_t prop, uint64_t value)
	{
	uint64_t *cached_copy = NULL;

	/*
	* Figure out where in the objset_t the cached copy would live, if it
	* is available for the requested property.
	*/
	if (os != NULL) {
	switch (prop) {
	case ZFS_PROP_VERSION:
	cached_copy = &os->os_version;
	break;
	case ZFS_PROP_NORMALIZE:
	cached_copy = &os->os_normalization;
	break;
	case ZFS_PROP_UTF8ONLY:
	cached_copy = &os->os_utf8only;
	break;
	case ZFS_PROP_CASE:
	cached_copy = &os->os_casesensitivity;
	break;
	default:
	break;
	}
	}
	if (cached_copy != NULL && *cached_copy != OBJSET_PROP_UNINITIALIZED) {
	value = cached_copy;
	return (0);
	}

	/*
	* If the property wasn't cached, look up the file system's value for
	* the property. For the version property, we look up a slightly
	* different string.
	*/
	const char *pname;
	int error = ENOENT;
	if (prop == ZFS_PROP_VERSION) {
	pname = ZPL_VERSION_STR;
	} else {
	pname = zfs_prop_to_name(prop);
	}

	if (os != NULL) {
	ASSERT3U(os->os_phys->os_type, ==, DMU_OST_ZFS);
	error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value);
	}

	if (error == ENOENT) {
	/* No value set, use the default value */
	switch (prop) {
	case ZFS_PROP_VERSION:
	*value = ZPL_VERSION;
	break;
	case ZFS_PROP_NORMALIZE:
	case ZFS_PROP_UTF8ONLY:
	*value = 0;
	break;
	case ZFS_PROP_CASE:
	*value = ZFS_CASE_SENSITIVE;
	break;
	case ZFS_PROP_ACLTYPE:
	*value = ZFS_ACLTYPE_NFSV4;
	break;
	default:
	return (error);
	}
	error = 0;
	}

	/*
	* If one of the methods for getting the property value above worked,
	* copy it into the objset_t's cache.
	*/
	if (error == 0 && cached_copy != NULL) {
	cached_copy = value;
	}

	return (error);
	}

	/*
	* Return true if the corresponding vfs's unmounted flag is set.
	* Otherwise return false.
	* If this function returns true we know VFS unmount has been initiated.
	*/
	boolean_t
	zfs_get_vfs_flag_unmounted(objset_t *os)
	{
	zfsvfs_t *zfvp;
	boolean_t unmounted = B_FALSE;

	- ASSERT(dmu_objset_type(os) == DMU_OST_ZFS);
	+ ASSERT3U(dmu_objset_type(os), ==, DMU_OST_ZFS);

	mutex_enter(&os->os_user_ptr_lock);
	zfvp = dmu_objset_get_user(os);
	if (zfvp != NULL && zfvp->z_vfs != NULL &&
	(zfvp->z_vfs->mnt_kern_flag & MNTK_UNMOUNT))
	unmounted = B_TRUE;
	mutex_exit(&os->os_user_ptr_lock);

	return (unmounted);
	}

	#ifdef _KERNEL
	void
	zfsvfs_update_fromname(const char oldname, const char newname)
	{
	char tmpbuf[MAXPATHLEN];
	struct mount *mp;
	char *fromname;
	size_t oldlen;

	oldlen = strlen(oldname);

	mtx_lock(&mountlist_mtx);
	TAILQ_FOREACH(mp, &mountlist, mnt_list) {
	fromname = mp->mnt_stat.f_mntfromname;
	if (strcmp(fromname, oldname) == 0) {
	(void) strlcpy(fromname, newname,
	sizeof (mp->mnt_stat.f_mntfromname));
	continue;
	}
	if (strncmp(fromname, oldname, oldlen) == 0 &&
	(fromname[oldlen] == '/' \|\| fromname[oldlen] == '@')) {
	(void) snprintf(tmpbuf, sizeof (tmpbuf), "%s%s",
	newname, fromname + oldlen);
	(void) strlcpy(fromname, tmpbuf,
	sizeof (mp->mnt_stat.f_mntfromname));
	continue;
	}
	}
	mtx_unlock(&mountlist_mtx);
	}
	#endif
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	index 6caca2992149..4672b9c2b8b3 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	@@ -1,5936 +1,6162 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	* Copyright 2017 Nexenta Systems, Inc.
	*/

	/* Portions Copyright 2007 Jeremy Teo */
	/* Portions Copyright 2010 Robert Milkowski */


	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/systm.h>
	#include <sys/sysmacros.h>
	#include <sys/resource.h>
	#include <sys/vfs.h>
	#include <sys/endian.h>
	#include <sys/vm.h>
	#include <sys/vnode.h>
	#if __FreeBSD_version >= 1300102
	#include <sys/smr.h>
	#endif
	#include <sys/dirent.h>
	#include <sys/file.h>
	#include <sys/stat.h>
	#include <sys/kmem.h>
	#include <sys/taskq.h>
	#include <sys/uio.h>
	#include <sys/atomic.h>
	#include <sys/namei.h>
	#include <sys/mman.h>
	#include <sys/cmn_err.h>
	#include <sys/kdb.h>
	#include <sys/sysproto.h>
	#include <sys/errno.h>
	#include <sys/unistd.h>
	#include <sys/zfs_dir.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/fs/zfs.h>
	#include <sys/dmu.h>
	#include <sys/dmu_objset.h>
	#include <sys/spa.h>
	#include <sys/txg.h>
	#include <sys/dbuf.h>
	#include <sys/zap.h>
	#include <sys/sa.h>
	#include <sys/policy.h>
	#include <sys/sunddi.h>
	#include <sys/filio.h>
	#include <sys/sid.h>
	#include <sys/zfs_ctldir.h>
	#include <sys/zfs_fuid.h>
	#include <sys/zfs_quota.h>
	#include <sys/zfs_sa.h>
	#include <sys/zfs_rlock.h>
	#include <sys/extdirent.h>
	#include <sys/bio.h>
	#include <sys/buf.h>
	#include <sys/sched.h>
	#include <sys/acl.h>
	#include <sys/vmmeter.h>
	#include <vm/vm_param.h>
	#include <sys/zil.h>
	#include <sys/zfs_vnops.h>

	#include <vm/vm_object.h>

	#include <sys/extattr.h>
	#include <sys/priv.h>

	#ifndef VN_OPEN_INVFS
	#define VN_OPEN_INVFS 0x0
	#endif

	VFS_SMR_DECLARE;

	#if __FreeBSD_version >= 1300047
	#define vm_page_wire_lock(pp)
	#define vm_page_wire_unlock(pp)
	#else
	#define vm_page_wire_lock(pp) vm_page_lock(pp)
	#define vm_page_wire_unlock(pp) vm_page_unlock(pp)
	#endif

	#ifdef DEBUG_VFS_LOCKS
	#define VNCHECKREF(vp) \
	VNASSERT((vp)->v_holdcnt > 0 && (vp)->v_usecount > 0, vp, \
	("%s: wrong ref counts", __func__));
	#else
	#define VNCHECKREF(vp)
	#endif

	/*
	* Programming rules.
	*
	* Each vnode op performs some logical unit of work. To do this, the ZPL must
	* properly lock its in-core state, create a DMU transaction, do the work,
	* record this work in the intent log (ZIL), commit the DMU transaction,
	* and wait for the intent log to commit if it is a synchronous operation.
	* Moreover, the vnode ops must work in both normal and log replay context.
	* The ordering of events is important to avoid deadlocks and references
	* to freed memory. The example below illustrates the following Big Rules:
	*
	* (1) A check must be made in each zfs thread for a mounted file system.
	* This is done avoiding races using ZFS_ENTER(zfsvfs).
	* A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes
	* must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
	* can return EIO from the calling function.
	*
	* (2) VN_RELE() should always be the last thing except for zil_commit()
	* (if necessary) and ZFS_EXIT(). This is for 3 reasons:
	* First, if it's the last reference, the vnode/znode
	* can be freed, so the zp may point to freed memory. Second, the last
	* reference will call zfs_zinactive(), which may induce a lot of work --
	* pushing cached pages (which acquires range locks) and syncing out
	* cached atime changes. Third, zfs_zinactive() may require a new tx,
	* which could deadlock the system if you were already holding one.
	* If you must call VN_RELE() within a tx then use VN_RELE_ASYNC().
	*
	* (3) All range locks must be grabbed before calling dmu_tx_assign(),
	* as they can span dmu_tx_assign() calls.
	*
	* (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to
	* dmu_tx_assign(). This is critical because we don't want to block
	* while holding locks.
	*
	* If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This
	* reduces lock contention and CPU usage when we must wait (note that if
	* throughput is constrained by the storage, nearly every transaction
	* must wait).
	*
	* Note, in particular, that if a lock is sometimes acquired before
	* the tx assigns, and sometimes after (e.g. z_lock), then failing
	* to use a non-blocking assign can deadlock the system. The scenario:
	*
	* Thread A has grabbed a lock before calling dmu_tx_assign().
	* Thread B is in an already-assigned tx, and blocks for this lock.
	* Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
	* forever, because the previous txg can't quiesce until B's tx commits.
	*
	* If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT,
	* then drop all locks, call dmu_tx_wait(), and try again. On subsequent
	* calls to dmu_tx_assign(), pass TXG_NOTHROTTLE in addition to TXG_NOWAIT,
	* to indicate that this operation has already called dmu_tx_wait().
	* This will ensure that we don't retry forever, waiting a short bit
	* each time.
	*
	* (5) If the operation succeeded, generate the intent log entry for it
	* before dropping locks. This ensures that the ordering of events
	* in the intent log matches the order in which they actually occurred.
	* During ZIL replay the zfs_log_* functions will update the sequence
	* number to indicate the zil transaction has replayed.
	*
	* (6) At the end of each vnode op, the DMU tx must always commit,
	* regardless of whether there were any errors.
	*
	* (7) After dropping all locks, invoke zil_commit(zilog, foid)
	* to ensure that synchronous semantics are provided when necessary.
	*
	* In general, this is how things should be ordered in each vnode op:
	*
	* ZFS_ENTER(zfsvfs); // exit if unmounted
	* top:
	* zfs_dirent_lookup(&dl, ...) // lock directory entry (may VN_HOLD())
	* rw_enter(...); // grab any other locks you need
	* tx = dmu_tx_create(...); // get DMU tx
	* dmu_tx_hold_*(); // hold each object you might modify
	* error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	* if (error) {
	* rw_exit(...); // drop locks
	* zfs_dirent_unlock(dl); // unlock directory entry
	* VN_RELE(...); // release held vnodes
	* if (error == ERESTART) {
	* waited = B_TRUE;
	* dmu_tx_wait(tx);
	* dmu_tx_abort(tx);
	* goto top;
	* }
	* dmu_tx_abort(tx); // abort DMU tx
	* ZFS_EXIT(zfsvfs); // finished in zfs
	* return (error); // really out of space
	* }
	* error = do_real_work(); // do whatever this VOP does
	* if (error == 0)
	* zfs_log_*(...); // on success, make ZIL entry
	* dmu_tx_commit(tx); // commit DMU tx -- error or not
	* rw_exit(...); // drop locks
	* zfs_dirent_unlock(dl); // unlock directory entry
	* VN_RELE(...); // release held vnodes
	* zil_commit(zilog, foid); // synchronous when necessary
	* ZFS_EXIT(zfsvfs); // finished in zfs
	* return (error); // done, report error
	*/

	/* ARGSUSED */
	static int
	zfs_open(vnode_t *vpp, int flag, cred_t cr)
	{
	znode_t zp = VTOZ(vpp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	if ((flag & FWRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
	((flag & FAPPEND) == 0)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan &&
	ZTOV(zp)->v_type == VREG &&
	!(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) {
	if (fs_vscan(*vpp, cr, 0) != 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EACCES));
	}
	}

	/* Keep a count of the synchronous opens in the znode */
	if (flag & (FSYNC \| FDSYNC))
	atomic_inc_32(&zp->z_sync_cnt);

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/* ARGSUSED */
	static int
	zfs_close(vnode_t vp, int flag, int count, offset_t offset, cred_t cr)
	{
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	/* Decrement the synchronous opens in the znode */
	if ((flag & (FSYNC \| FDSYNC)) && (count == 1))
	atomic_dec_32(&zp->z_sync_cnt);

	if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan &&
	ZTOV(zp)->v_type == VREG &&
	!(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0)
	- VERIFY(fs_vscan(vp, cr, 1) == 0);
	+ VERIFY0(fs_vscan(vp, cr, 1));

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/* ARGSUSED */
	static int
	zfs_ioctl(vnode_t vp, ulong_t com, intptr_t data, int flag, cred_t cred,
	int *rvalp)
	{
	loff_t off;
	int error;

	switch (com) {
	case _FIOFFS:
	{
	return (0);

	/*
	* The following two ioctls are used by bfu. Faking out,
	* necessary to avoid bfu errors.
	*/
	}
	case _FIOGDIO:
	case _FIOSDIO:
	{
	return (0);
	}

	case F_SEEK_DATA:
	case F_SEEK_HOLE:
	{
	off = (offset_t )data;
	/* offset parameter is in/out */
	error = zfs_holey(VTOZ(vp), com, &off);
	if (error)
	return (error);
	(offset_t )data = off;
	return (0);
	}
	}
	return (SET_ERROR(ENOTTY));
	}

	static vm_page_t
	page_busy(vnode_t *vp, int64_t start, int64_t off, int64_t nbytes)
	{
	vm_object_t obj;
	vm_page_t pp;
	int64_t end;

	/*
	* At present vm_page_clear_dirty extends the cleared range to DEV_BSIZE
	* aligned boundaries, if the range is not aligned. As a result a
	* DEV_BSIZE subrange with partially dirty data may get marked as clean.
	* It may happen that all DEV_BSIZE subranges are marked clean and thus
	* the whole page would be considered clean despite have some
	* dirty data.
	* For this reason we should shrink the range to DEV_BSIZE aligned
	* boundaries before calling vm_page_clear_dirty.
	*/
	end = rounddown2(off + nbytes, DEV_BSIZE);
	off = roundup2(off, DEV_BSIZE);
	nbytes = end - off;

	obj = vp->v_object;
	zfs_vmobject_assert_wlocked_12(obj);
	#if __FreeBSD_version < 1300050
	for (;;) {
	if ((pp = vm_page_lookup(obj, OFF_TO_IDX(start))) != NULL &&
	pp->valid) {
	if (vm_page_xbusied(pp)) {
	/*
	* Reference the page before unlocking and
	* sleeping so that the page daemon is less
	* likely to reclaim it.
	*/
	vm_page_reference(pp);
	vm_page_lock(pp);
	zfs_vmobject_wunlock(obj);
	vm_page_busy_sleep(pp, "zfsmwb", true);
	zfs_vmobject_wlock(obj);
	continue;
	}
	vm_page_sbusy(pp);
	} else if (pp != NULL) {
	ASSERT(!pp->valid);
	pp = NULL;
	}
	if (pp != NULL) {
	ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
	vm_object_pip_add(obj, 1);
	pmap_remove_write(pp);
	if (nbytes != 0)
	vm_page_clear_dirty(pp, off, nbytes);
	}
	break;
	}
	#else
	vm_page_grab_valid_unlocked(&pp, obj, OFF_TO_IDX(start),
	VM_ALLOC_NOCREAT \| VM_ALLOC_SBUSY \| VM_ALLOC_NORMAL \|
	VM_ALLOC_IGN_SBUSY);
	if (pp != NULL) {
	ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
	vm_object_pip_add(obj, 1);
	pmap_remove_write(pp);
	if (nbytes != 0)
	vm_page_clear_dirty(pp, off, nbytes);
	}
	#endif
	return (pp);
	}

	static void
	page_unbusy(vm_page_t pp)
	{

	vm_page_sunbusy(pp);
	#if __FreeBSD_version >= 1300041
	vm_object_pip_wakeup(pp->object);
	#else
	vm_object_pip_subtract(pp->object, 1);
	#endif
	}

	#if __FreeBSD_version > 1300051
	static vm_page_t
	page_hold(vnode_t *vp, int64_t start)
	{
	vm_object_t obj;
	vm_page_t m;

	obj = vp->v_object;
	vm_page_grab_valid_unlocked(&m, obj, OFF_TO_IDX(start),
	VM_ALLOC_NOCREAT \| VM_ALLOC_WIRED \| VM_ALLOC_IGN_SBUSY \|
	VM_ALLOC_NOBUSY);
	return (m);
	}
	#else
	static vm_page_t
	page_hold(vnode_t *vp, int64_t start)
	{
	vm_object_t obj;
	vm_page_t pp;

	obj = vp->v_object;
	zfs_vmobject_assert_wlocked(obj);

	for (;;) {
	if ((pp = vm_page_lookup(obj, OFF_TO_IDX(start))) != NULL &&
	pp->valid) {
	if (vm_page_xbusied(pp)) {
	/*
	* Reference the page before unlocking and
	* sleeping so that the page daemon is less
	* likely to reclaim it.
	*/
	vm_page_reference(pp);
	vm_page_lock(pp);
	zfs_vmobject_wunlock(obj);
	vm_page_busy_sleep(pp, "zfsmwb", true);
	zfs_vmobject_wlock(obj);
	continue;
	}

	ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
	vm_page_wire_lock(pp);
	vm_page_hold(pp);
	vm_page_wire_unlock(pp);

	} else
	pp = NULL;
	break;
	}
	return (pp);
	}
	#endif

	static void
	page_unhold(vm_page_t pp)
	{

	vm_page_wire_lock(pp);
	#if __FreeBSD_version >= 1300035
	vm_page_unwire(pp, PQ_ACTIVE);
	#else
	vm_page_unhold(pp);
	#endif
	vm_page_wire_unlock(pp);
	}

	/*
	* When a file is memory mapped, we must keep the IO data synchronized
	* between the DMU cache and the memory mapped pages. What this means:
	*
	* On Write: If we find a memory mapped page, we write to both
	* the page and the dmu buffer.
	*/
	void
	update_pages(znode_t zp, int64_t start, int len, objset_t os)
	{
	vm_object_t obj;
	struct sf_buf *sf;
	vnode_t *vp = ZTOV(zp);
	caddr_t va;
	int off;

	- ASSERT(vp->v_mount != NULL);
	+ ASSERT3P(vp->v_mount, !=, NULL);
	obj = vp->v_object;
	- ASSERT(obj != NULL);
	+ ASSERT3P(obj, !=, NULL);

	off = start & PAGEOFFSET;
	zfs_vmobject_wlock_12(obj);
	#if __FreeBSD_version >= 1300041
	vm_object_pip_add(obj, 1);
	#endif
	for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
	vm_page_t pp;
	int nbytes = imin(PAGESIZE - off, len);

	if ((pp = page_busy(vp, start, off, nbytes)) != NULL) {
	zfs_vmobject_wunlock_12(obj);

	va = zfs_map_page(pp, &sf);
	(void) dmu_read(os, zp->z_id, start + off, nbytes,
	va + off, DMU_READ_PREFETCH);
	zfs_unmap_page(sf);

	zfs_vmobject_wlock_12(obj);
	page_unbusy(pp);
	}
	len -= nbytes;
	off = 0;
	}
	#if __FreeBSD_version >= 1300041
	vm_object_pip_wakeup(obj);
	#else
	vm_object_pip_wakeupn(obj, 0);
	#endif
	zfs_vmobject_wunlock_12(obj);
	}

	/*
	* Read with UIO_NOCOPY flag means that sendfile(2) requests
	* ZFS to populate a range of page cache pages with data.
	*
	* NOTE: this function could be optimized to pre-allocate
	* all pages in advance, drain exclusive busy on all of them,
	* map them into contiguous KVA region and populate them
	* in one single dmu_read() call.
	*/
	int
	mappedread_sf(znode_t zp, int nbytes, zfs_uio_t uio)
	{
	vnode_t *vp = ZTOV(zp);
	objset_t *os = zp->z_zfsvfs->z_os;
	struct sf_buf *sf;
	vm_object_t obj;
	vm_page_t pp;
	int64_t start;
	caddr_t va;
	int len = nbytes;
	int error = 0;

	- ASSERT(zfs_uio_segflg(uio) == UIO_NOCOPY);
	- ASSERT(vp->v_mount != NULL);
	+ ASSERT3U(zfs_uio_segflg(uio), ==, UIO_NOCOPY);
	+ ASSERT3P(vp->v_mount, !=, NULL);
	obj = vp->v_object;
	- ASSERT(obj != NULL);
	- ASSERT((zfs_uio_offset(uio) & PAGEOFFSET) == 0);
	+ ASSERT3P(obj, !=, NULL);
	+ ASSERT0(zfs_uio_offset(uio) & PAGEOFFSET);

	zfs_vmobject_wlock_12(obj);
	for (start = zfs_uio_offset(uio); len > 0; start += PAGESIZE) {
	int bytes = MIN(PAGESIZE, len);

	pp = vm_page_grab_unlocked(obj, OFF_TO_IDX(start),
	VM_ALLOC_SBUSY \| VM_ALLOC_NORMAL \| VM_ALLOC_IGN_SBUSY);
	if (vm_page_none_valid(pp)) {
	zfs_vmobject_wunlock_12(obj);
	va = zfs_map_page(pp, &sf);
	error = dmu_read(os, zp->z_id, start, bytes, va,
	DMU_READ_PREFETCH);
	if (bytes != PAGESIZE && error == 0)
	bzero(va + bytes, PAGESIZE - bytes);
	zfs_unmap_page(sf);
	zfs_vmobject_wlock_12(obj);
	#if __FreeBSD_version >= 1300081
	if (error == 0) {
	vm_page_valid(pp);
	vm_page_activate(pp);
	vm_page_do_sunbusy(pp);
	} else {
	zfs_vmobject_wlock(obj);
	if (!vm_page_wired(pp) && pp->valid == 0 &&
	vm_page_busy_tryupgrade(pp))
	vm_page_free(pp);
	else
	vm_page_sunbusy(pp);
	zfs_vmobject_wunlock(obj);
	}
	#else
	vm_page_do_sunbusy(pp);
	vm_page_lock(pp);
	if (error) {
	if (pp->wire_count == 0 && pp->valid == 0 &&
	!vm_page_busied(pp))
	vm_page_free(pp);
	} else {
	pp->valid = VM_PAGE_BITS_ALL;
	vm_page_activate(pp);
	}
	vm_page_unlock(pp);
	#endif
	} else {
	ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
	vm_page_do_sunbusy(pp);
	}
	if (error)
	break;
	zfs_uio_advance(uio, bytes);
	len -= bytes;
	}
	zfs_vmobject_wunlock_12(obj);
	return (error);
	}

	/*
	* When a file is memory mapped, we must keep the IO data synchronized
	* between the DMU cache and the memory mapped pages. What this means:
	*
	* On Read: We "read" preferentially from memory mapped pages,
	* else we default from the dmu buffer.
	*
	* NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
	* the file is memory mapped.
	*/
	int
	mappedread(znode_t zp, int nbytes, zfs_uio_t uio)
	{
	vnode_t *vp = ZTOV(zp);
	vm_object_t obj;
	int64_t start;
	int len = nbytes;
	int off;
	int error = 0;

	- ASSERT(vp->v_mount != NULL);
	+ ASSERT3P(vp->v_mount, !=, NULL);
	obj = vp->v_object;
	- ASSERT(obj != NULL);
	+ ASSERT3P(obj, !=, NULL);

	start = zfs_uio_offset(uio);
	off = start & PAGEOFFSET;
	zfs_vmobject_wlock_12(obj);
	for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
	vm_page_t pp;
	uint64_t bytes = MIN(PAGESIZE - off, len);

	if ((pp = page_hold(vp, start))) {
	struct sf_buf *sf;
	caddr_t va;

	zfs_vmobject_wunlock_12(obj);
	va = zfs_map_page(pp, &sf);
	error = vn_io_fault_uiomove(va + off, bytes,
	GET_UIO_STRUCT(uio));
	zfs_unmap_page(sf);
	zfs_vmobject_wlock_12(obj);
	page_unhold(pp);
	} else {
	zfs_vmobject_wunlock_12(obj);
	error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
	uio, bytes);
	zfs_vmobject_wlock_12(obj);
	}
	len -= bytes;
	off = 0;
	if (error)
	break;
	}
	zfs_vmobject_wunlock_12(obj);
	return (error);
	}

	int
	zfs_write_simple(znode_t zp, const void data, size_t len,
	loff_t pos, size_t *presid)
	{
	int error = 0;
	ssize_t resid;

	error = vn_rdwr(UIO_WRITE, ZTOV(zp), __DECONST(void *, data), len, pos,
	UIO_SYSSPACE, IO_SYNC, kcred, NOCRED, &resid, curthread);

	if (error) {
	return (SET_ERROR(error));
	} else if (presid == NULL) {
	if (resid != 0) {
	error = SET_ERROR(EIO);
	}
	} else {
	*presid = resid;
	}
	return (error);
	}

	void
	zfs_zrele_async(znode_t *zp)
	{
	vnode_t *vp = ZTOV(zp);
	objset_t *os = ITOZSB(vp)->z_os;

	VN_RELE_ASYNC(vp, dsl_pool_zrele_taskq(dmu_objset_pool(os)));
	}

	static int
	zfs_dd_callback(struct mount mp, void arg, int lkflags, struct vnode **vpp)
	{
	int error;

	*vpp = arg;
	error = vn_lock(*vpp, lkflags);
	if (error != 0)
	vrele(*vpp);
	return (error);
	}

	static int
	zfs_lookup_lock(vnode_t dvp, vnode_t vp, const char *name, int lkflags)
	{
	znode_t *zdp = VTOZ(dvp);
	zfsvfs_t *zfsvfs __unused = zdp->z_zfsvfs;
	int error;
	int ltype;

	if (zfsvfs->z_replay == B_FALSE)
	ASSERT_VOP_LOCKED(dvp, __func__);

	if (name[0] == 0 \|\| (name[0] == '.' && name[1] == 0)) {
	ASSERT3P(dvp, ==, vp);
	vref(dvp);
	ltype = lkflags & LK_TYPE_MASK;
	if (ltype != VOP_ISLOCKED(dvp)) {
	if (ltype == LK_EXCLUSIVE)
	vn_lock(dvp, LK_UPGRADE \| LK_RETRY);
	else /* if (ltype == LK_SHARED) */
	vn_lock(dvp, LK_DOWNGRADE \| LK_RETRY);

	/*
	* Relock for the "." case could leave us with
	* reclaimed vnode.
	*/
	if (VN_IS_DOOMED(dvp)) {
	vrele(dvp);
	return (SET_ERROR(ENOENT));
	}
	}
	return (0);
	} else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
	/*
	* Note that in this case, dvp is the child vnode, and we
	* are looking up the parent vnode - exactly reverse from
	* normal operation. Unlocking dvp requires some rather
	* tricky unlock/relock dance to prevent mp from being freed;
	* use vn_vget_ino_gen() which takes care of all that.
	*
	* XXX Note that there is a time window when both vnodes are
	* unlocked. It is possible, although highly unlikely, that
	* during that window the parent-child relationship between
	* the vnodes may change, for example, get reversed.
	* In that case we would have a wrong lock order for the vnodes.
	* All other filesystems seem to ignore this problem, so we
	* do the same here.
	* A potential solution could be implemented as follows:
	* - using LK_NOWAIT when locking the second vnode and retrying
	* if necessary
	* - checking that the parent-child relationship still holds
	* after locking both vnodes and retrying if it doesn't
	*/
	error = vn_vget_ino_gen(dvp, zfs_dd_callback, vp, lkflags, &vp);
	return (error);
	} else {
	error = vn_lock(vp, lkflags);
	if (error != 0)
	vrele(vp);
	return (error);
	}
	}

	/*
	* Lookup an entry in a directory, or an extended attribute directory.
	* If it exists, return a held vnode reference for it.
	*
	* IN: dvp - vnode of directory to search.
	* nm - name of entry to lookup.
	* pnp - full pathname to lookup [UNUSED].
	* flags - LOOKUP_XATTR set if looking for an attribute.
	* rdir - root directory vnode [UNUSED].
	* cr - credentials of caller.
	* ct - caller context
	*
	* OUT: vpp - vnode of located entry, NULL if not found.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* NA
	*/
	/* ARGSUSED */
	static int
	zfs_lookup(vnode_t dvp, const char nm, vnode_t **vpp,
	struct componentname cnp, int nameiop, cred_t cr, kthread_t *td,
	int flags, boolean_t cached)
	{
	znode_t *zdp = VTOZ(dvp);
	znode_t *zp;
	zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
	#if __FreeBSD_version > 1300124
	seqc_t dvp_seqc;
	#endif
	int error = 0;

	/*
	* Fast path lookup, however we must skip DNLC lookup
	* for case folding or normalizing lookups because the
	* DNLC code only stores the passed in name. This means
	* creating 'a' and removing 'A' on a case insensitive
	* file system would work, but DNLC still thinks 'a'
	* exists and won't let you create it again on the next
	* pass through fast path.
	*/
	if (!(flags & LOOKUP_XATTR)) {
	if (dvp->v_type != VDIR) {
	return (SET_ERROR(ENOTDIR));
	} else if (zdp->z_sa_hdl == NULL) {
	return (SET_ERROR(EIO));
	}
	}

	DTRACE_PROBE2(zfs__fastpath__lookup__miss, vnode_t *, dvp,
	const char *, nm);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zdp);

	#if __FreeBSD_version > 1300124
	dvp_seqc = vn_seqc_read_notmodify(dvp);
	#endif

	*vpp = NULL;

	if (flags & LOOKUP_XATTR) {
	/*
	* If the xattr property is off, refuse the lookup request.
	*/
	if (!(zfsvfs->z_flags & ZSB_XATTR)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EOPNOTSUPP));
	}

	/*
	* We don't allow recursive attributes..
	* Maybe someday we will.
	*/
	if (zdp->z_pflags & ZFS_XATTR) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	if ((error = zfs_get_xattrdir(VTOZ(dvp), &zp, cr, flags))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	*vpp = ZTOV(zp);

	/*
	* Do we have permission to get into attribute directory?
	*/
	error = zfs_zaccess(zp, ACE_EXECUTE, 0, B_FALSE, cr);
	if (error) {
	vrele(ZTOV(zp));
	}

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Check accessibility of directory if we're not coming in via
	* VOP_CACHEDLOOKUP.
	*/
	if (!cached) {
	#ifdef NOEXECCHECK
	if ((cnp->cn_flags & NOEXECCHECK) != 0) {
	cnp->cn_flags &= ~NOEXECCHECK;
	} else
	#endif
	if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	}

	if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm),
	NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}


	/*
	* First handle the special cases.
	*/
	if ((cnp->cn_flags & ISDOTDOT) != 0) {
	/*
	* If we are a snapshot mounted under .zfs, return
	* the vp for the snapshot directory.
	*/
	if (zdp->z_id == zfsvfs->z_root && zfsvfs->z_parent != zfsvfs) {
	struct componentname cn;
	vnode_t *zfsctl_vp;
	int ltype;

	ZFS_EXIT(zfsvfs);
	ltype = VOP_ISLOCKED(dvp);
	VOP_UNLOCK1(dvp);
	error = zfsctl_root(zfsvfs->z_parent, LK_SHARED,
	&zfsctl_vp);
	if (error == 0) {
	cn.cn_nameptr = "snapshot";
	cn.cn_namelen = strlen(cn.cn_nameptr);
	cn.cn_nameiop = cnp->cn_nameiop;
	cn.cn_flags = cnp->cn_flags & ~ISDOTDOT;
	cn.cn_lkflags = cnp->cn_lkflags;
	error = VOP_LOOKUP(zfsctl_vp, vpp, &cn);
	vput(zfsctl_vp);
	}
	vn_lock(dvp, ltype \| LK_RETRY);
	return (error);
	}
	}
	if (zfs_has_ctldir(zdp) && strcmp(nm, ZFS_CTLDIR_NAME) == 0) {
	ZFS_EXIT(zfsvfs);
	if ((cnp->cn_flags & ISLASTCN) != 0 && nameiop != LOOKUP)
	return (SET_ERROR(ENOTSUP));
	error = zfsctl_root(zfsvfs, cnp->cn_lkflags, vpp);
	return (error);
	}

	/*
	* The loop is retry the lookup if the parent-child relationship
	* changes during the dot-dot locking complexities.
	*/
	for (;;) {
	uint64_t parent;

	error = zfs_dirlook(zdp, nm, &zp);
	if (error == 0)
	*vpp = ZTOV(zp);

	ZFS_EXIT(zfsvfs);
	if (error != 0)
	break;

	error = zfs_lookup_lock(dvp, *vpp, nm, cnp->cn_lkflags);
	if (error != 0) {
	/*
	* If we've got a locking error, then the vnode
	* got reclaimed because of a force unmount.
	* We never enter doomed vnodes into the name cache.
	*/
	*vpp = NULL;
	return (error);
	}

	if ((cnp->cn_flags & ISDOTDOT) == 0)
	break;

	ZFS_ENTER(zfsvfs);
	if (zdp->z_sa_hdl == NULL) {
	error = SET_ERROR(EIO);
	} else {
	error = sa_lookup(zdp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
	&parent, sizeof (parent));
	}
	if (error != 0) {
	ZFS_EXIT(zfsvfs);
	vput(ZTOV(zp));
	break;
	}
	if (zp->z_id == parent) {
	ZFS_EXIT(zfsvfs);
	break;
	}
	vput(ZTOV(zp));
	}

	if (error != 0)
	*vpp = NULL;

	/* Translate errors and add SAVENAME when needed. */
	if (cnp->cn_flags & ISLASTCN) {
	switch (nameiop) {
	case CREATE:
	case RENAME:
	if (error == ENOENT) {
	error = EJUSTRETURN;
	cnp->cn_flags \|= SAVENAME;
	break;
	}
	/* FALLTHROUGH */
	case DELETE:
	if (error == 0)
	cnp->cn_flags \|= SAVENAME;
	break;
	}
	}

	#if __FreeBSD_version > 1300124
	if ((cnp->cn_flags & ISDOTDOT) != 0) {
	/*
	* FIXME: zfs_lookup_lock relocks vnodes and does nothing to
	* handle races. In particular different callers may end up
	* with different vnodes and will try to add conflicting
	* entries to the namecache.
	*
	* While finding different result may be acceptable in face
	* of concurrent modification, adding conflicting entries
	* trips over an assert in the namecache.
	*
	* Ultimately let an entry through once everything settles.
	*/
	if (!vn_seqc_consistent(dvp, dvp_seqc)) {
	cnp->cn_flags &= ~MAKEENTRY;
	}
	}
	#endif

	/* Insert name into cache (as non-existent) if appropriate. */
	if (zfsvfs->z_use_namecache && !zfsvfs->z_replay &&
	error == ENOENT && (cnp->cn_flags & MAKEENTRY) != 0)
	cache_enter(dvp, NULL, cnp);

	/* Insert name into cache if appropriate. */
	if (zfsvfs->z_use_namecache && !zfsvfs->z_replay &&
	error == 0 && (cnp->cn_flags & MAKEENTRY)) {
	if (!(cnp->cn_flags & ISLASTCN) \|\|
	(nameiop != DELETE && nameiop != RENAME)) {
	cache_enter(dvp, *vpp, cnp);
	}
	}

	return (error);
	}

	/*
	* Attempt to create a new entry in a directory. If the entry
	* already exists, truncate the file if permissible, else return
	* an error. Return the vp of the created or trunc'd file.
	*
	* IN: dvp - vnode of directory to put new file entry in.
	* name - name of new file entry.
	* vap - attributes of new file.
	* excl - flag indicating exclusive or non-exclusive mode.
	* mode - mode to open file with.
	* cr - credentials of caller.
	* flag - large file flag [UNUSED].
	* ct - caller context
	* vsecp - ACL to be set
	*
	* OUT: vpp - vnode of created or trunc'd entry.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* dvp - ctime\|mtime updated if new entry created
	* vp - ctime\|mtime always, atime if new
	*/

	/* ARGSUSED */
	int
	zfs_create(znode_t dzp, const char name, vattr_t *vap, int excl, int mode,
	znode_t *zpp, cred_t cr, int flag, vsecattr_t *vsecp)
	{
	znode_t *zp;
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	zilog_t *zilog;
	objset_t *os;
	dmu_tx_t *tx;
	int error;
	ksid_t *ksid;
	uid_t uid;
	gid_t gid = crgetgid(cr);
	uint64_t projid = ZFS_DEFAULT_PROJID;
	zfs_acl_ids_t acl_ids;
	boolean_t fuid_dirtied;
	uint64_t txtype;
	#ifdef DEBUG_VFS_LOCKS
	vnode_t *dvp = ZTOV(dzp);
	#endif

	/*
	* If we have an ephemeral id, ACL, or XVATTR then
	* make sure file system is at proper version
	*/

	ksid = crgetsid(cr, KSID_OWNER);
	if (ksid)
	uid = ksid_getid(ksid);
	else
	uid = crgetuid(cr);

	if (zfsvfs->z_use_fuids == B_FALSE &&
	(vsecp \|\| (vap->va_mask & AT_XVATTR) \|\|
	IS_EPHEMERAL(uid) \|\| IS_EPHEMERAL(gid)))
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	os = zfsvfs->z_os;
	zilog = zfsvfs->z_log;

	if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
	NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}

	if (vap->va_mask & AT_XVATTR) {
	if ((error = secpolicy_xvattr(ZTOV(dzp), (xvattr_t *)vap,
	crgetuid(cr), cr, vap->va_type)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	}

	*zpp = NULL;

	if ((vap->va_mode & S_ISVTX) && secpolicy_vnode_stky_modify(cr))
	vap->va_mode &= ~S_ISVTX;

	error = zfs_dirent_lookup(dzp, name, &zp, ZNEW);
	if (error) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	ASSERT3P(zp, ==, NULL);

	/*
	* Create a new file object and update the directory
	* to reference it.
	*/
	if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
	goto out;
	}

	/*
	* We only support the creation of regular files in
	* extended attribute directories.
	*/

	if ((dzp->z_pflags & ZFS_XATTR) &&
	(vap->va_type != VREG)) {
	error = SET_ERROR(EINVAL);
	goto out;
	}

	if ((error = zfs_acl_ids_create(dzp, 0, vap,
	cr, vsecp, &acl_ids)) != 0)
	goto out;

	if (S_ISREG(vap->va_mode) \|\| S_ISDIR(vap->va_mode))
	projid = zfs_inherit_projid(dzp);
	if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
	zfs_acl_ids_free(&acl_ids);
	error = SET_ERROR(EDQUOT);
	goto out;
	}

	getnewvnode_reserve_();

	tx = dmu_tx_create(os);

	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
	ZFS_SA_BASE_ATTR_SIZE);

	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);
	dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
	dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
	if (!zfsvfs->z_use_sa &&
	acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
	0, acl_ids.z_aclp->z_acl_bytes);
	}
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_abort(tx);
	getnewvnode_drop_reserve();
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	(void) zfs_link_create(dzp, name, zp, tx, ZNEW);
	txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
	zfs_log_create(zilog, tx, txtype, dzp, zp, name,
	vsecp, acl_ids.z_fuidp, vap);
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_commit(tx);

	getnewvnode_drop_reserve();

	out:
	VNCHECKREF(dvp);
	if (error == 0) {
	*zpp = zp;
	}

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Remove an entry from a directory.
	*
	* IN: dvp - vnode of directory to remove entry from.
	* name - name of entry to remove.
	* cr - credentials of caller.
	* ct - caller context
	* flags - case flags
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* dvp - ctime\|mtime
	* vp - ctime (if nlink > 0)
	*/

	/ARGSUSED/
	static int
	zfs_remove_(vnode_t dvp, vnode_t vp, const char name, cred_t cr)
	{
	znode_t *dzp = VTOZ(dvp);
	znode_t *zp;
	znode_t *xzp;
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	zilog_t *zilog;
	uint64_t xattr_obj;
	uint64_t obj = 0;
	dmu_tx_t *tx;
	boolean_t unlinked;
	uint64_t txtype;
	int error;


	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	zp = VTOZ(vp);
	ZFS_VERIFY_ZP(zp);
	zilog = zfsvfs->z_log;

	xattr_obj = 0;
	xzp = NULL;

	if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
	goto out;
	}

	/*
	* Need to use rmdir for removing directories.
	*/
	if (vp->v_type == VDIR) {
	error = SET_ERROR(EPERM);
	goto out;
	}

	vnevent_remove(vp, dvp, name, ct);

	obj = zp->z_id;

	/* are there any extended attributes? */
	error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
	&xattr_obj, sizeof (xattr_obj));
	if (error == 0 && xattr_obj) {
	error = zfs_zget(zfsvfs, xattr_obj, &xzp);
	ASSERT0(error);
	}

	/*
	* We may delete the znode now, or we may put it in the unlinked set;
	* it depends on whether we're the last link, and on whether there are
	* other holds on the vnode. So we dmu_tx_hold() the right things to
	* allow for either case.
	*/
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	zfs_sa_upgrade_txholds(tx, dzp);

	if (xzp) {
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
	dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
	}

	/* charge as an update -- would be nice not to charge at all */
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);

	/*
	* Mark this transaction as typically resulting in a net free of space
	*/
	dmu_tx_mark_netfree(tx);

	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Remove the directory entry.
	*/
	error = zfs_link_destroy(dzp, name, zp, tx, ZEXISTS, &unlinked);

	if (error) {
	dmu_tx_commit(tx);
	goto out;
	}

	if (unlinked) {
	zfs_unlinked_add(zp, tx);
	vp->v_vflag \|= VV_NOSYNC;
	}
	/* XXX check changes to linux vnops */
	txtype = TX_REMOVE;
	zfs_log_remove(zilog, tx, txtype, dzp, name, obj, unlinked);

	dmu_tx_commit(tx);
	out:

	if (xzp)
	vrele(ZTOV(xzp));

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);


	ZFS_EXIT(zfsvfs);
	return (error);
	}


	static int
	zfs_lookup_internal(znode_t dzp, const char name, vnode_t **vpp,
	struct componentname *cnp, int nameiop)
	{
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	int error;

	cnp->cn_nameptr = __DECONST(char *, name);
	cnp->cn_namelen = strlen(name);
	cnp->cn_nameiop = nameiop;
	cnp->cn_flags = ISLASTCN \| SAVENAME;
	cnp->cn_lkflags = LK_EXCLUSIVE \| LK_RETRY;
	cnp->cn_cred = kcred;
	cnp->cn_thread = curthread;

	if (zfsvfs->z_use_namecache && !zfsvfs->z_replay) {
	struct vop_lookup_args a;

	a.a_gen.a_desc = &vop_lookup_desc;
	a.a_dvp = ZTOV(dzp);
	a.a_vpp = vpp;
	a.a_cnp = cnp;
	error = vfs_cache_lookup(&a);
	} else {
	error = zfs_lookup(ZTOV(dzp), name, vpp, cnp, nameiop, kcred,
	curthread, 0, B_FALSE);
	}
	#ifdef ZFS_DEBUG
	if (error) {
	printf("got error %d on name %s on op %d\n", error, name,
	nameiop);
	kdb_backtrace();
	}
	#endif
	return (error);
	}

	int
	zfs_remove(znode_t dzp, const char name, cred_t *cr, int flags)
	{
	vnode_t *vp;
	int error;
	struct componentname cn;

	if ((error = zfs_lookup_internal(dzp, name, &vp, &cn, DELETE)))
	return (error);

	error = zfs_remove_(ZTOV(dzp), vp, name, cr);
	vput(vp);
	return (error);
	}
	/*
	* Create a new directory and insert it into dvp using the name
	* provided. Return a pointer to the inserted directory.
	*
	* IN: dvp - vnode of directory to add subdir to.
	* dirname - name of new directory.
	* vap - attributes of new directory.
	* cr - credentials of caller.
	* ct - caller context
	* flags - case flags
	* vsecp - ACL to be set
	*
	* OUT: vpp - vnode of created directory.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* dvp - ctime\|mtime updated
	* vp - ctime\|mtime\|atime updated
	*/
	/ARGSUSED/
	int
	zfs_mkdir(znode_t dzp, const char dirname, vattr_t vap, znode_t *zpp,
	cred_t cr, int flags, vsecattr_t vsecp)
	{
	znode_t *zp;
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	zilog_t *zilog;
	uint64_t txtype;
	dmu_tx_t *tx;
	int error;
	ksid_t *ksid;
	uid_t uid;
	gid_t gid = crgetgid(cr);
	zfs_acl_ids_t acl_ids;
	boolean_t fuid_dirtied;

	- ASSERT(vap->va_type == VDIR);
	+ ASSERT3U(vap->va_type, ==, VDIR);

	/*
	* If we have an ephemeral id, ACL, or XVATTR then
	* make sure file system is at proper version
	*/

	ksid = crgetsid(cr, KSID_OWNER);
	if (ksid)
	uid = ksid_getid(ksid);
	else
	uid = crgetuid(cr);
	if (zfsvfs->z_use_fuids == B_FALSE &&
	((vap->va_mask & AT_XVATTR) \|\|
	IS_EPHEMERAL(uid) \|\| IS_EPHEMERAL(gid)))
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	zilog = zfsvfs->z_log;

	if (dzp->z_pflags & ZFS_XATTR) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	if (zfsvfs->z_utf8 && u8_validate(dirname,
	strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}

	if (vap->va_mask & AT_XVATTR) {
	if ((error = secpolicy_xvattr(ZTOV(dzp), (xvattr_t *)vap,
	crgetuid(cr), cr, vap->va_type)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	}

	if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
	NULL, &acl_ids)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* First make sure the new directory doesn't exist.
	*
	* Existence is checked first to make sure we don't return
	* EACCES instead of EEXIST which can cause some applications
	* to fail.
	*/
	*zpp = NULL;

	if ((error = zfs_dirent_lookup(dzp, dirname, &zp, ZNEW))) {
	zfs_acl_ids_free(&acl_ids);
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	ASSERT3P(zp, ==, NULL);

	if ((error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr))) {
	zfs_acl_ids_free(&acl_ids);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, zfs_inherit_projid(dzp))) {
	zfs_acl_ids_free(&acl_ids);
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EDQUOT));
	}

	/*
	* Add a new entry to the directory.
	*/
	getnewvnode_reserve_();
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
	dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);
	if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
	acl_ids.z_aclp->z_acl_bytes);
	}

	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
	ZFS_SA_BASE_ATTR_SIZE);

	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_abort(tx);
	getnewvnode_drop_reserve();
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Create new node.
	*/
	zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	/*
	* Now put new name in parent dir.
	*/
	(void) zfs_link_create(dzp, dirname, zp, tx, ZNEW);

	*zpp = zp;

	txtype = zfs_log_create_txtype(Z_DIR, NULL, vap);
	zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, NULL,
	acl_ids.z_fuidp, vap);

	zfs_acl_ids_free(&acl_ids);

	dmu_tx_commit(tx);

	getnewvnode_drop_reserve();

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	#if __FreeBSD_version < 1300124
	static void
	cache_vop_rmdir(struct vnode dvp, struct vnode vp)
	{

	cache_purge(dvp);
	cache_purge(vp);
	}
	#endif

	/*
	* Remove a directory subdir entry. If the current working
	* directory is the same as the subdir to be removed, the
	* remove will fail.
	*
	* IN: dvp - vnode of directory to remove from.
	* name - name of directory to be removed.
	* cwd - vnode of current working directory.
	* cr - credentials of caller.
	* ct - caller context
	* flags - case flags
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* dvp - ctime\|mtime updated
	*/
	/ARGSUSED/
	static int
	zfs_rmdir_(vnode_t dvp, vnode_t vp, const char name, cred_t cr)
	{
	znode_t *dzp = VTOZ(dvp);
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	zilog_t *zilog;
	dmu_tx_t *tx;
	int error;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	ZFS_VERIFY_ZP(zp);
	zilog = zfsvfs->z_log;


	if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
	goto out;
	}

	if (vp->v_type != VDIR) {
	error = SET_ERROR(ENOTDIR);
	goto out;
	}

	vnevent_rmdir(vp, dvp, name, ct);

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
	zfs_sa_upgrade_txholds(tx, zp);
	zfs_sa_upgrade_txholds(tx, dzp);
	dmu_tx_mark_netfree(tx);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	error = zfs_link_destroy(dzp, name, zp, tx, ZEXISTS, NULL);

	if (error == 0) {
	uint64_t txtype = TX_RMDIR;
	zfs_log_remove(zilog, tx, txtype, dzp, name,
	ZFS_NO_OBJECT, B_FALSE);
	}

	dmu_tx_commit(tx);

	cache_vop_rmdir(dvp, vp);
	out:
	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	int
	zfs_rmdir(znode_t dzp, const char name, znode_t cwd, cred_t cr, int flags)
	{
	struct componentname cn;
	vnode_t *vp;
	int error;

	if ((error = zfs_lookup_internal(dzp, name, &vp, &cn, DELETE)))
	return (error);

	error = zfs_rmdir_(ZTOV(dzp), vp, name, cr);
	vput(vp);
	return (error);
	}

	/*
	* Read as many directory entries as will fit into the provided
	* buffer from the given directory cursor position (specified in
	* the uio structure).
	*
	* IN: vp - vnode of directory to read.
	* uio - structure supplying read location, range info,
	* and return buffer.
	* cr - credentials of caller.
	* ct - caller context
	* flags - case flags
	*
	* OUT: uio - updated offset and range, buffer filled.
	* eofp - set to true if end-of-file detected.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* vp - atime updated
	*
	* Note that the low 4 bits of the cookie returned by zap is always zero.
	* This allows us to use the low range for "special" directory entries:
	* We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
	* we use the offset 2 for the '.zfs' directory.
	*/
	/* ARGSUSED */
	static int
	zfs_readdir(vnode_t vp, zfs_uio_t uio, cred_t cr, int eofp,
	int ncookies, ulong_t *cookies)
	{
	znode_t *zp = VTOZ(vp);
	iovec_t *iovp;
	edirent_t *eodp;
	dirent64_t *odp;
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	objset_t *os;
	caddr_t outbuf;
	size_t bufsize;
	zap_cursor_t zc;
	zap_attribute_t zap;
	uint_t bytes_wanted;
	uint64_t offset; /* must be unsigned; checks for < 1 */
	uint64_t parent;
	int local_eof;
	int outcount;
	int error;
	uint8_t prefetch;
	boolean_t check_sysattrs;
	uint8_t type;
	int ncooks;
	ulong_t *cooks = NULL;
	int flags = 0;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
	&parent, sizeof (parent))) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* If we are not given an eof variable,
	* use a local one.
	*/
	if (eofp == NULL)
	eofp = &local_eof;

	/*
	* Check for valid iov_len.
	*/
	if (GET_UIO_STRUCT(uio)->uio_iov->iov_len <= 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	/*
	* Quit if directory has been removed (posix)
	*/
	if ((*eofp = zp->z_unlinked) != 0) {
	ZFS_EXIT(zfsvfs);
	return (0);
	}

	error = 0;
	os = zfsvfs->z_os;
	offset = zfs_uio_offset(uio);
	prefetch = zp->z_zn_prefetch;

	/*
	* Initialize the iterator cursor.
	*/
	if (offset <= 3) {
	/*
	* Start iteration from the beginning of the directory.
	*/
	zap_cursor_init(&zc, os, zp->z_id);
	} else {
	/*
	* The offset is a serialized cursor.
	*/
	zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
	}

	/*
	* Get space to change directory entries into fs independent format.
	*/
	iovp = GET_UIO_STRUCT(uio)->uio_iov;
	bytes_wanted = iovp->iov_len;
	if (zfs_uio_segflg(uio) != UIO_SYSSPACE \|\| zfs_uio_iovcnt(uio) != 1) {
	bufsize = bytes_wanted;
	outbuf = kmem_alloc(bufsize, KM_SLEEP);
	odp = (struct dirent64 *)outbuf;
	} else {
	bufsize = bytes_wanted;
	outbuf = NULL;
	odp = (struct dirent64 *)iovp->iov_base;
	}
	eodp = (struct edirent *)odp;

	if (ncookies != NULL) {
	/*
	* Minimum entry size is dirent size and 1 byte for a file name.
	*/
	ncooks = zfs_uio_resid(uio) / (sizeof (struct dirent) -
	sizeof (((struct dirent *)NULL)->d_name) + 1);
	cooks = malloc(ncooks * sizeof (ulong_t), M_TEMP, M_WAITOK);
	*cookies = cooks;
	*ncookies = ncooks;
	}
	/*
	* If this VFS supports the system attribute view interface; and
	* we're looking at an extended attribute directory; and we care
	* about normalization conflicts on this vfs; then we must check
	* for normalization conflicts with the sysattr name space.
	*/
	#ifdef TODO
	check_sysattrs = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) &&
	(vp->v_flag & V_XATTRDIR) && zfsvfs->z_norm &&
	(flags & V_RDDIR_ENTFLAGS);
	#else
	check_sysattrs = 0;
	#endif

	/*
	* Transform to file-system independent format
	*/
	outcount = 0;
	while (outcount < bytes_wanted) {
	ino64_t objnum;
	ushort_t reclen;
	off64_t *next = NULL;

	/*
	* Special case `.', `..', and `.zfs'.
	*/
	if (offset == 0) {
	(void) strcpy(zap.za_name, ".");
	zap.za_normalization_conflict = 0;
	objnum = zp->z_id;
	type = DT_DIR;
	} else if (offset == 1) {
	(void) strcpy(zap.za_name, "..");
	zap.za_normalization_conflict = 0;
	objnum = parent;
	type = DT_DIR;
	} else if (offset == 2 && zfs_show_ctldir(zp)) {
	(void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
	zap.za_normalization_conflict = 0;
	objnum = ZFSCTL_INO_ROOT;
	type = DT_DIR;
	} else {
	/*
	* Grab next entry.
	*/
	if ((error = zap_cursor_retrieve(&zc, &zap))) {
	if ((*eofp = (error == ENOENT)) != 0)
	break;
	else
	goto update;
	}

	if (zap.za_integer_length != 8 \|\|
	zap.za_num_integers != 1) {
	cmn_err(CE_WARN, "zap_readdir: bad directory "
	"entry, obj = %lld, offset = %lld\n",
	(u_longlong_t)zp->z_id,
	(u_longlong_t)offset);
	error = SET_ERROR(ENXIO);
	goto update;
	}

	objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
	/*
	* MacOS X can extract the object type here such as:
	* uint8_t type = ZFS_DIRENT_TYPE(zap.za_first_integer);
	*/
	type = ZFS_DIRENT_TYPE(zap.za_first_integer);

	if (check_sysattrs && !zap.za_normalization_conflict) {
	#ifdef TODO
	zap.za_normalization_conflict =
	xattr_sysattr_casechk(zap.za_name);
	#else
	panic("%s:%u: TODO", __func__, __LINE__);
	#endif
	}
	}

	if (flags & V_RDDIR_ACCFILTER) {
	/*
	* If we have no access at all, don't include
	* this entry in the returned information
	*/
	znode_t *ezp;
	if (zfs_zget(zp->z_zfsvfs, objnum, &ezp) != 0)
	goto skip_entry;
	if (!zfs_has_access(ezp, cr)) {
	vrele(ZTOV(ezp));
	goto skip_entry;
	}
	vrele(ZTOV(ezp));
	}

	if (flags & V_RDDIR_ENTFLAGS)
	reclen = EDIRENT_RECLEN(strlen(zap.za_name));
	else
	reclen = DIRENT64_RECLEN(strlen(zap.za_name));

	/*
	* Will this entry fit in the buffer?
	*/
	if (outcount + reclen > bufsize) {
	/*
	* Did we manage to fit anything in the buffer?
	*/
	if (!outcount) {
	error = SET_ERROR(EINVAL);
	goto update;
	}
	break;
	}
	if (flags & V_RDDIR_ENTFLAGS) {
	/*
	* Add extended flag entry:
	*/
	eodp->ed_ino = objnum;
	eodp->ed_reclen = reclen;
	/* NOTE: ed_off is the offset for the next entry */
	next = &(eodp->ed_off);
	eodp->ed_eflags = zap.za_normalization_conflict ?
	ED_CASE_CONFLICT : 0;
	(void) strncpy(eodp->ed_name, zap.za_name,
	EDIRENT_NAMELEN(reclen));
	eodp = (edirent_t *)((intptr_t)eodp + reclen);
	} else {
	/*
	* Add normal entry:
	*/
	odp->d_ino = objnum;
	odp->d_reclen = reclen;
	odp->d_namlen = strlen(zap.za_name);
	/* NOTE: d_off is the offset for the next entry. */
	next = &odp->d_off;
	strlcpy(odp->d_name, zap.za_name, odp->d_namlen + 1);
	odp->d_type = type;
	dirent_terminate(odp);
	odp = (dirent64_t *)((intptr_t)odp + reclen);
	}
	outcount += reclen;

	- ASSERT(outcount <= bufsize);
	+ ASSERT3S(outcount, <=, bufsize);

	/* Prefetch znode */
	if (prefetch)
	dmu_prefetch(os, objnum, 0, 0, 0,
	ZIO_PRIORITY_SYNC_READ);

	skip_entry:
	/*
	* Move to the next entry, fill in the previous offset.
	*/
	if (offset > 2 \|\| (offset == 2 && !zfs_show_ctldir(zp))) {
	zap_cursor_advance(&zc);
	offset = zap_cursor_serialize(&zc);
	} else {
	offset += 1;
	}

	/* Fill the offset right after advancing the cursor. */
	if (next != NULL)
	*next = offset;
	if (cooks != NULL) {
	*cooks++ = offset;
	ncooks--;
	KASSERT(ncooks >= 0, ("ncookies=%d", ncooks));
	}
	}
	zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */

	/* Subtract unused cookies */
	if (ncookies != NULL)
	*ncookies -= ncooks;

	if (zfs_uio_segflg(uio) == UIO_SYSSPACE && zfs_uio_iovcnt(uio) == 1) {
	iovp->iov_base += outcount;
	iovp->iov_len -= outcount;
	zfs_uio_resid(uio) -= outcount;
	} else if ((error =
	zfs_uiomove(outbuf, (long)outcount, UIO_READ, uio))) {
	/*
	* Reset the pointer.
	*/
	offset = zfs_uio_offset(uio);
	}

	update:
	zap_cursor_fini(&zc);
	if (zfs_uio_segflg(uio) != UIO_SYSSPACE \|\| zfs_uio_iovcnt(uio) != 1)
	kmem_free(outbuf, bufsize);

	if (error == ENOENT)
	error = 0;

	ZFS_ACCESSTIME_STAMP(zfsvfs, zp);

	zfs_uio_setoffset(uio, offset);
	ZFS_EXIT(zfsvfs);
	if (error != 0 && cookies != NULL) {
	free(*cookies, M_TEMP);
	*cookies = NULL;
	*ncookies = 0;
	}
	return (error);
	}

	/*
	* Get the requested file attributes and place them in the provided
	* vattr structure.
	*
	* IN: vp - vnode of file.
	* vap - va_mask identifies requested attributes.
	* If AT_XVATTR set, then optional attrs are requested
	* flags - ATTR_NOACLCHECK (CIFS server context)
	* cr - credentials of caller.
	*
	* OUT: vap - attribute values.
	*
	* RETURN: 0 (always succeeds).
	*/
	/* ARGSUSED */
	static int
	zfs_getattr(vnode_t vp, vattr_t vap, int flags, cred_t *cr)
	{
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	int error = 0;
	uint32_t blksize;
	u_longlong_t nblocks;
	uint64_t mtime[2], ctime[2], crtime[2], rdev;
	xvattr_t xvap = (xvattr_t )vap; /* vap may be an xvattr_t * */
	xoptattr_t *xoap = NULL;
	boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
	sa_bulk_attr_t bulk[4];
	int count = 0;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid);

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &crtime, 16);
	if (vp->v_type == VBLK \|\| vp->v_type == VCHR)
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_RDEV(zfsvfs), NULL,
	&rdev, 8);

	if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
	* Also, if we are the owner don't bother, since owner should
	* always be allowed to read basic attributes of file.
	*/
	if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) &&
	(vap->va_uid != crgetuid(cr))) {
	if ((error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0,
	skipaclchk, cr))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	}

	/*
	* Return all attributes. It's cheaper to provide the answer
	* than to determine whether we were asked the question.
	*/

	vap->va_type = IFTOVT(zp->z_mode);
	vap->va_mode = zp->z_mode & ~S_IFMT;
	vn_fsid(vp, vap);
	vap->va_nodeid = zp->z_id;
	vap->va_nlink = zp->z_links;
	if ((vp->v_flag & VROOT) && zfs_show_ctldir(zp) &&
	zp->z_links < ZFS_LINK_MAX)
	vap->va_nlink++;
	vap->va_size = zp->z_size;
	if (vp->v_type == VBLK \|\| vp->v_type == VCHR)
	vap->va_rdev = zfs_cmpldev(rdev);
	vap->va_seq = zp->z_seq;
	vap->va_flags = 0; /* FreeBSD: Reset chflags(2) flags. */
	vap->va_filerev = zp->z_seq;

	/*
	* Add in any requested optional attributes and the create time.
	* Also set the corresponding bits in the returned attribute bitmap.
	*/
	if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) {
	if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
	xoap->xoa_archive =
	((zp->z_pflags & ZFS_ARCHIVE) != 0);
	XVA_SET_RTN(xvap, XAT_ARCHIVE);
	}

	if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
	xoap->xoa_readonly =
	((zp->z_pflags & ZFS_READONLY) != 0);
	XVA_SET_RTN(xvap, XAT_READONLY);
	}

	if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
	xoap->xoa_system =
	((zp->z_pflags & ZFS_SYSTEM) != 0);
	XVA_SET_RTN(xvap, XAT_SYSTEM);
	}

	if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
	xoap->xoa_hidden =
	((zp->z_pflags & ZFS_HIDDEN) != 0);
	XVA_SET_RTN(xvap, XAT_HIDDEN);
	}

	if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
	xoap->xoa_nounlink =
	((zp->z_pflags & ZFS_NOUNLINK) != 0);
	XVA_SET_RTN(xvap, XAT_NOUNLINK);
	}

	if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
	xoap->xoa_immutable =
	((zp->z_pflags & ZFS_IMMUTABLE) != 0);
	XVA_SET_RTN(xvap, XAT_IMMUTABLE);
	}

	if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
	xoap->xoa_appendonly =
	((zp->z_pflags & ZFS_APPENDONLY) != 0);
	XVA_SET_RTN(xvap, XAT_APPENDONLY);
	}

	if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
	xoap->xoa_nodump =
	((zp->z_pflags & ZFS_NODUMP) != 0);
	XVA_SET_RTN(xvap, XAT_NODUMP);
	}

	if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
	xoap->xoa_opaque =
	((zp->z_pflags & ZFS_OPAQUE) != 0);
	XVA_SET_RTN(xvap, XAT_OPAQUE);
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
	xoap->xoa_av_quarantined =
	((zp->z_pflags & ZFS_AV_QUARANTINED) != 0);
	XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
	xoap->xoa_av_modified =
	((zp->z_pflags & ZFS_AV_MODIFIED) != 0);
	XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) &&
	vp->v_type == VREG) {
	zfs_sa_get_scanstamp(zp, xvap);
	}

	if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
	xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0);
	XVA_SET_RTN(xvap, XAT_REPARSE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_GEN)) {
	xoap->xoa_generation = zp->z_gen;
	XVA_SET_RTN(xvap, XAT_GEN);
	}

	if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
	xoap->xoa_offline =
	((zp->z_pflags & ZFS_OFFLINE) != 0);
	XVA_SET_RTN(xvap, XAT_OFFLINE);
	}

	if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
	xoap->xoa_sparse =
	((zp->z_pflags & ZFS_SPARSE) != 0);
	XVA_SET_RTN(xvap, XAT_SPARSE);
	}

	if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
	xoap->xoa_projinherit =
	((zp->z_pflags & ZFS_PROJINHERIT) != 0);
	XVA_SET_RTN(xvap, XAT_PROJINHERIT);
	}

	if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
	xoap->xoa_projid = zp->z_projid;
	XVA_SET_RTN(xvap, XAT_PROJID);
	}
	}

	ZFS_TIME_DECODE(&vap->va_atime, zp->z_atime);
	ZFS_TIME_DECODE(&vap->va_mtime, mtime);
	ZFS_TIME_DECODE(&vap->va_ctime, ctime);
	ZFS_TIME_DECODE(&vap->va_birthtime, crtime);


	sa_object_size(zp->z_sa_hdl, &blksize, &nblocks);
	vap->va_blksize = blksize;
	vap->va_bytes = nblocks << 9; /* nblocks * 512 */

	if (zp->z_blksz == 0) {
	/*
	* Block size hasn't been set; suggest maximal I/O transfers.
	*/
	vap->va_blksize = zfsvfs->z_max_blksz;
	}

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/*
	* Set the file attributes to the values contained in the
	* vattr structure.
	*
	* IN: zp - znode of file to be modified.
	* vap - new attribute values.
	* If AT_XVATTR set, then optional attrs are being set
	* flags - ATTR_UTIME set if non-default time values provided.
	* - ATTR_NOACLCHECK (CIFS context only).
	* cr - credentials of caller.
	* ct - caller context
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* vp - ctime updated, mtime updated if size changed.
	*/
	/* ARGSUSED */
	int
	zfs_setattr(znode_t zp, vattr_t vap, int flags, cred_t *cr)
	{
	vnode_t *vp = ZTOV(zp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	objset_t *os = zfsvfs->z_os;
	zilog_t *zilog;
	dmu_tx_t *tx;
	vattr_t oldva;
	xvattr_t tmpxvattr;
	uint_t mask = vap->va_mask;
	uint_t saved_mask = 0;
	uint64_t saved_mode;
	int trim_mask = 0;
	uint64_t new_mode;
	uint64_t new_uid, new_gid;
	uint64_t xattr_obj;
	uint64_t mtime[2], ctime[2];
	uint64_t projid = ZFS_INVALID_PROJID;
	znode_t *attrzp;
	int need_policy = FALSE;
	int err, err2;
	zfs_fuid_info_t *fuidp = NULL;
	xvattr_t xvap = (xvattr_t )vap; /* vap may be an xvattr_t * */
	xoptattr_t *xoap;
	zfs_acl_t *aclp;
	boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
	boolean_t fuid_dirtied = B_FALSE;
	sa_bulk_attr_t bulk[7], xattr_bulk[7];
	int count = 0, xattr_count = 0;

	if (mask == 0)
	return (0);

	if (mask & AT_NOSET)
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	zilog = zfsvfs->z_log;

	/*
	* Make sure that if we have ephemeral uid/gid or xvattr specified
	* that file system is at proper version level
	*/

	if (zfsvfs->z_use_fuids == B_FALSE &&
	(((mask & AT_UID) && IS_EPHEMERAL(vap->va_uid)) \|\|
	((mask & AT_GID) && IS_EPHEMERAL(vap->va_gid)) \|\|
	(mask & AT_XVATTR))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	if (mask & AT_SIZE && vp->v_type == VDIR) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EISDIR));
	}

	if (mask & AT_SIZE && vp->v_type != VREG && vp->v_type != VFIFO) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	/*
	* If this is an xvattr_t, then get a pointer to the structure of
	* optional attributes. If this is NULL, then we have a vattr_t.
	*/
	xoap = xva_getxoptattr(xvap);

	xva_init(&tmpxvattr);

	/*
	* Immutable files can only alter immutable bit and atime
	*/
	if ((zp->z_pflags & ZFS_IMMUTABLE) &&
	((mask & (AT_SIZE\|AT_UID\|AT_GID\|AT_MTIME\|AT_MODE)) \|\|
	((mask & AT_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	/*
	* Note: ZFS_READONLY is handled in zfs_zaccess_common.
	*/

	/*
	* Verify timestamps doesn't overflow 32 bits.
	* ZFS can handle large timestamps, but 32bit syscalls can't
	* handle times greater than 2039. This check should be removed
	* once large timestamps are fully supported.
	*/
	if (mask & (AT_ATIME \| AT_MTIME)) {
	if (((mask & AT_ATIME) && TIMESPEC_OVERFLOW(&vap->va_atime)) \|\|
	((mask & AT_MTIME) && TIMESPEC_OVERFLOW(&vap->va_mtime))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EOVERFLOW));
	}
	}
	if (xoap != NULL && (mask & AT_XVATTR)) {
	if (XVA_ISSET_REQ(xvap, XAT_CREATETIME) &&
	TIMESPEC_OVERFLOW(&vap->va_birthtime)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EOVERFLOW));
	}

	if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
	if (!dmu_objset_projectquota_enabled(os) \|\|
	(!S_ISREG(zp->z_mode) && !S_ISDIR(zp->z_mode))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EOPNOTSUPP));
	}

	projid = xoap->xoa_projid;
	if (unlikely(projid == ZFS_INVALID_PROJID)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	if (projid == zp->z_projid && zp->z_pflags & ZFS_PROJID)
	projid = ZFS_INVALID_PROJID;
	else
	need_policy = TRUE;
	}

	if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT) &&
	(xoap->xoa_projinherit !=
	((zp->z_pflags & ZFS_PROJINHERIT) != 0)) &&
	(!dmu_objset_projectquota_enabled(os) \|\|
	(!S_ISREG(zp->z_mode) && !S_ISDIR(zp->z_mode)))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EOPNOTSUPP));
	}
	}

	attrzp = NULL;
	aclp = NULL;

	if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EROFS));
	}

	/*
	* First validate permissions
	*/

	if (mask & AT_SIZE) {
	/*
	* XXX - Note, we are not providing any open
	* mode flags here (like FNDELAY), so we may
	* block if there are locks present... this
	* should be addressed in openat().
	*/
	/* XXX - would it be OK to generate a log record here? */
	err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
	if (err) {
	ZFS_EXIT(zfsvfs);
	return (err);
	}
	}

	if (mask & (AT_ATIME\|AT_MTIME) \|\|
	((mask & AT_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) \|\|
	XVA_ISSET_REQ(xvap, XAT_READONLY) \|\|
	XVA_ISSET_REQ(xvap, XAT_ARCHIVE) \|\|
	XVA_ISSET_REQ(xvap, XAT_OFFLINE) \|\|
	XVA_ISSET_REQ(xvap, XAT_SPARSE) \|\|
	XVA_ISSET_REQ(xvap, XAT_CREATETIME) \|\|
	XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
	need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
	skipaclchk, cr);
	}

	if (mask & (AT_UID\|AT_GID)) {
	int idmask = (mask & (AT_UID\|AT_GID));
	int take_owner;
	int take_group;

	/*
	* NOTE: even if a new mode is being set,
	* we may clear S_ISUID/S_ISGID bits.
	*/

	if (!(mask & AT_MODE))
	vap->va_mode = zp->z_mode;

	/*
	* Take ownership or chgrp to group we are a member of
	*/

	take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr));
	take_group = (mask & AT_GID) &&
	zfs_groupmember(zfsvfs, vap->va_gid, cr);

	/*
	* If both AT_UID and AT_GID are set then take_owner and
	* take_group must both be set in order to allow taking
	* ownership.
	*
	* Otherwise, send the check through secpolicy_vnode_setattr()
	*
	*/

	if (((idmask == (AT_UID\|AT_GID)) && take_owner && take_group) \|\|
	((idmask == AT_UID) && take_owner) \|\|
	((idmask == AT_GID) && take_group)) {
	if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
	skipaclchk, cr) == 0) {
	/*
	* Remove setuid/setgid for non-privileged users
	*/
	secpolicy_setid_clear(vap, vp, cr);
	trim_mask = (mask & (AT_UID\|AT_GID));
	} else {
	need_policy = TRUE;
	}
	} else {
	need_policy = TRUE;
	}
	}

	oldva.va_mode = zp->z_mode;
	zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
	if (mask & AT_XVATTR) {
	/*
	* Update xvattr mask to include only those attributes
	* that are actually changing.
	*
	* the bits will be restored prior to actually setting
	* the attributes so the caller thinks they were set.
	*/
	if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
	if (xoap->xoa_appendonly !=
	((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_APPENDONLY);
	XVA_SET_REQ(&tmpxvattr, XAT_APPENDONLY);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
	if (xoap->xoa_projinherit !=
	((zp->z_pflags & ZFS_PROJINHERIT) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_PROJINHERIT);
	XVA_SET_REQ(&tmpxvattr, XAT_PROJINHERIT);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
	if (xoap->xoa_nounlink !=
	((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_NOUNLINK);
	XVA_SET_REQ(&tmpxvattr, XAT_NOUNLINK);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
	if (xoap->xoa_immutable !=
	((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
	XVA_SET_REQ(&tmpxvattr, XAT_IMMUTABLE);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
	if (xoap->xoa_nodump !=
	((zp->z_pflags & ZFS_NODUMP) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_NODUMP);
	XVA_SET_REQ(&tmpxvattr, XAT_NODUMP);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
	if (xoap->xoa_av_modified !=
	((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
	XVA_SET_REQ(&tmpxvattr, XAT_AV_MODIFIED);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
	if ((vp->v_type != VREG &&
	xoap->xoa_av_quarantined) \|\|
	xoap->xoa_av_quarantined !=
	((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
	XVA_SET_REQ(&tmpxvattr, XAT_AV_QUARANTINED);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	if (need_policy == FALSE &&
	(XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) \|\|
	XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
	need_policy = TRUE;
	}
	}

	if (mask & AT_MODE) {
	if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
	err = secpolicy_setid_setsticky_clear(vp, vap,
	&oldva, cr);
	if (err) {
	ZFS_EXIT(zfsvfs);
	return (err);
	}
	trim_mask \|= AT_MODE;
	} else {
	need_policy = TRUE;
	}
	}

	if (need_policy) {
	/*
	* If trim_mask is set then take ownership
	* has been granted or write_acl is present and user
	* has the ability to modify mode. In that case remove
	* UID\|GID and or MODE from mask so that
	* secpolicy_vnode_setattr() doesn't revoke it.
	*/

	if (trim_mask) {
	saved_mask = vap->va_mask;
	vap->va_mask &= ~trim_mask;
	if (trim_mask & AT_MODE) {
	/*
	* Save the mode, as secpolicy_vnode_setattr()
	* will overwrite it with ova.va_mode.
	*/
	saved_mode = vap->va_mode;
	}
	}
	err = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags,
	(int ()(void , int, cred_t *))zfs_zaccess_unix, zp);
	if (err) {
	ZFS_EXIT(zfsvfs);
	return (err);
	}

	if (trim_mask) {
	vap->va_mask \|= saved_mask;
	if (trim_mask & AT_MODE) {
	/*
	* Recover the mode after
	* secpolicy_vnode_setattr().
	*/
	vap->va_mode = saved_mode;
	}
	}
	}

	/*
	* secpolicy_vnode_setattr, or take ownership may have
	* changed va_mask
	*/
	mask = vap->va_mask;

	if ((mask & (AT_UID \| AT_GID)) \|\| projid != ZFS_INVALID_PROJID) {
	err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
	&xattr_obj, sizeof (xattr_obj));

	if (err == 0 && xattr_obj) {
	err = zfs_zget(zp->z_zfsvfs, xattr_obj, &attrzp);
	if (err == 0) {
	err = vn_lock(ZTOV(attrzp), LK_EXCLUSIVE);
	if (err != 0)
	vrele(ZTOV(attrzp));
	}
	if (err)
	goto out2;
	}
	if (mask & AT_UID) {
	new_uid = zfs_fuid_create(zfsvfs,
	(uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
	if (new_uid != zp->z_uid &&
	zfs_id_overquota(zfsvfs, DMU_USERUSED_OBJECT,
	new_uid)) {
	if (attrzp)
	vput(ZTOV(attrzp));
	err = SET_ERROR(EDQUOT);
	goto out2;
	}
	}

	if (mask & AT_GID) {
	new_gid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_gid,
	cr, ZFS_GROUP, &fuidp);
	if (new_gid != zp->z_gid &&
	zfs_id_overquota(zfsvfs, DMU_GROUPUSED_OBJECT,
	new_gid)) {
	if (attrzp)
	vput(ZTOV(attrzp));
	err = SET_ERROR(EDQUOT);
	goto out2;
	}
	}

	if (projid != ZFS_INVALID_PROJID &&
	zfs_id_overquota(zfsvfs, DMU_PROJECTUSED_OBJECT, projid)) {
	if (attrzp)
	vput(ZTOV(attrzp));
	err = SET_ERROR(EDQUOT);
	goto out2;
	}
	}
	tx = dmu_tx_create(os);

	if (mask & AT_MODE) {
	uint64_t pmode = zp->z_mode;
	uint64_t acl_obj;
	new_mode = (pmode & S_IFMT) \| (vap->va_mode & ~S_IFMT);

	if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED &&
	!(zp->z_pflags & ZFS_ACL_TRIVIAL)) {
	err = SET_ERROR(EPERM);
	goto out;
	}

	if ((err = zfs_acl_chmod_setattr(zp, &aclp, new_mode)))
	goto out;

	if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
	/*
	* Are we upgrading ACL from old V0 format
	* to V1 format?
	*/
	if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
	zfs_znode_acl_version(zp) ==
	ZFS_ACL_VERSION_INITIAL) {
	dmu_tx_hold_free(tx, acl_obj, 0,
	DMU_OBJECT_END);
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
	0, aclp->z_acl_bytes);
	} else {
	dmu_tx_hold_write(tx, acl_obj, 0,
	aclp->z_acl_bytes);
	}
	} else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
	0, aclp->z_acl_bytes);
	}
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
	} else {
	if (((mask & AT_XVATTR) &&
	XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) \|\|
	(projid != ZFS_INVALID_PROJID &&
	!(zp->z_pflags & ZFS_PROJID)))
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
	else
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	}

	if (attrzp) {
	dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
	}

	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);

	zfs_sa_upgrade_txholds(tx, zp);

	err = dmu_tx_assign(tx, TXG_WAIT);
	if (err)
	goto out;

	count = 0;
	/*
	* Set each attribute requested.
	* We group settings according to the locks they need to acquire.
	*
	* Note: you cannot set ctime directly, although it will be
	* updated as a side-effect of calling this function.
	*/

	if (projid != ZFS_INVALID_PROJID && !(zp->z_pflags & ZFS_PROJID)) {
	/*
	* For the existed object that is upgraded from old system,
	* its on-disk layout has no slot for the project ID attribute.
	* But quota accounting logic needs to access related slots by
	* offset directly. So we need to adjust old objects' layout
	* to make the project ID to some unified and fixed offset.
	*/
	if (attrzp)
	err = sa_add_projid(attrzp->z_sa_hdl, tx, projid);
	if (err == 0)
	err = sa_add_projid(zp->z_sa_hdl, tx, projid);

	if (unlikely(err == EEXIST))
	err = 0;
	else if (err != 0)
	goto out;
	else
	projid = ZFS_INVALID_PROJID;
	}

	if (mask & (AT_UID\|AT_GID\|AT_MODE))
	mutex_enter(&zp->z_acl_lock);

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, sizeof (zp->z_pflags));

	if (attrzp) {
	if (mask & (AT_UID\|AT_GID\|AT_MODE))
	mutex_enter(&attrzp->z_acl_lock);
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags,
	sizeof (attrzp->z_pflags));
	if (projid != ZFS_INVALID_PROJID) {
	attrzp->z_projid = projid;
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_PROJID(zfsvfs), NULL, &attrzp->z_projid,
	sizeof (attrzp->z_projid));
	}
	}

	if (mask & (AT_UID\|AT_GID)) {

	if (mask & AT_UID) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
	&new_uid, sizeof (new_uid));
	zp->z_uid = new_uid;
	if (attrzp) {
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_UID(zfsvfs), NULL, &new_uid,
	sizeof (new_uid));
	attrzp->z_uid = new_uid;
	}
	}

	if (mask & AT_GID) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs),
	NULL, &new_gid, sizeof (new_gid));
	zp->z_gid = new_gid;
	if (attrzp) {
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_GID(zfsvfs), NULL, &new_gid,
	sizeof (new_gid));
	attrzp->z_gid = new_gid;
	}
	}
	if (!(mask & AT_MODE)) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs),
	NULL, &new_mode, sizeof (new_mode));
	new_mode = zp->z_mode;
	}
	err = zfs_acl_chown_setattr(zp);
	- ASSERT(err == 0);
	+ ASSERT0(err);
	if (attrzp) {
	vn_seqc_write_begin(ZTOV(attrzp));
	err = zfs_acl_chown_setattr(attrzp);
	vn_seqc_write_end(ZTOV(attrzp));
	- ASSERT(err == 0);
	+ ASSERT0(err);
	}
	}

	if (mask & AT_MODE) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
	&new_mode, sizeof (new_mode));
	zp->z_mode = new_mode;
	- ASSERT3U((uintptr_t)aclp, !=, 0);
	+ ASSERT3P(aclp, !=, NULL);
	err = zfs_aclset_common(zp, aclp, cr, tx);
	ASSERT0(err);
	if (zp->z_acl_cached)
	zfs_acl_free(zp->z_acl_cached);
	zp->z_acl_cached = aclp;
	aclp = NULL;
	}


	if (mask & AT_ATIME) {
	ZFS_TIME_ENCODE(&vap->va_atime, zp->z_atime);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
	&zp->z_atime, sizeof (zp->z_atime));
	}

	if (mask & AT_MTIME) {
	ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
	mtime, sizeof (mtime));
	}

	if (projid != ZFS_INVALID_PROJID) {
	zp->z_projid = projid;
	SA_ADD_BULK_ATTR(bulk, count,
	SA_ZPL_PROJID(zfsvfs), NULL, &zp->z_projid,
	sizeof (zp->z_projid));
	}

	/* XXX - shouldn't this be done before the ATIME/MTIME checks? */
	if (mask & AT_SIZE && !(mask & AT_MTIME)) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
	NULL, mtime, sizeof (mtime));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	&ctime, sizeof (ctime));
	zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
	} else if (mask != 0) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	&ctime, sizeof (ctime));
	zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime);
	if (attrzp) {
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_CTIME(zfsvfs), NULL,
	&ctime, sizeof (ctime));
	zfs_tstamp_update_setup(attrzp, STATE_CHANGED,
	mtime, ctime);
	}
	}

	/*
	* Do this after setting timestamps to prevent timestamp
	* update from toggling bit
	*/

	if (xoap && (mask & AT_XVATTR)) {

	if (XVA_ISSET_REQ(xvap, XAT_CREATETIME))
	xoap->xoa_createtime = vap->va_birthtime;
	/*
	* restore trimmed off masks
	* so that return masks can be set for caller.
	*/

	if (XVA_ISSET_REQ(&tmpxvattr, XAT_APPENDONLY)) {
	XVA_SET_REQ(xvap, XAT_APPENDONLY);
	}
	if (XVA_ISSET_REQ(&tmpxvattr, XAT_NOUNLINK)) {
	XVA_SET_REQ(xvap, XAT_NOUNLINK);
	}
	if (XVA_ISSET_REQ(&tmpxvattr, XAT_IMMUTABLE)) {
	XVA_SET_REQ(xvap, XAT_IMMUTABLE);
	}
	if (XVA_ISSET_REQ(&tmpxvattr, XAT_NODUMP)) {
	XVA_SET_REQ(xvap, XAT_NODUMP);
	}
	if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_MODIFIED)) {
	XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
	}
	if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_QUARANTINED)) {
	XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
	}
	if (XVA_ISSET_REQ(&tmpxvattr, XAT_PROJINHERIT)) {
	XVA_SET_REQ(xvap, XAT_PROJINHERIT);
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
	- ASSERT(vp->v_type == VREG);
	+ ASSERT3S(vp->v_type, ==, VREG);

	zfs_xvattr_set(zp, xvap, tx);
	}

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	if (mask != 0)
	zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);

	if (mask & (AT_UID\|AT_GID\|AT_MODE))
	mutex_exit(&zp->z_acl_lock);

	if (attrzp) {
	if (mask & (AT_UID\|AT_GID\|AT_MODE))
	mutex_exit(&attrzp->z_acl_lock);
	}
	out:
	if (err == 0 && attrzp) {
	err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
	xattr_count, tx);
	- ASSERT(err2 == 0);
	+ ASSERT0(err2);
	}

	if (attrzp)
	vput(ZTOV(attrzp));

	if (aclp)
	zfs_acl_free(aclp);

	if (fuidp) {
	zfs_fuid_info_free(fuidp);
	fuidp = NULL;
	}

	if (err) {
	dmu_tx_abort(tx);
	} else {
	err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
	dmu_tx_commit(tx);
	}

	out2:
	if (os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (err);
	}

	/*
	* We acquire all but fdvp locks using non-blocking acquisitions. If we
	* fail to acquire any lock in the path we will drop all held locks,
	* acquire the new lock in a blocking fashion, and then release it and
	* restart the rename. This acquire/release step ensures that we do not
	* spin on a lock waiting for release. On error release all vnode locks
	* and decrement references the way tmpfs_rename() would do.
	*/
	static int
	zfs_rename_relock(struct vnode sdvp, struct vnode *svpp,
	struct vnode tdvp, struct vnode *tvpp,
	const struct componentname scnp, const struct componentname tcnp)
	{
	zfsvfs_t *zfsvfs;
	struct vnode nvp, svp, *tvp;
	znode_t sdzp, tdzp, szp, tzp;
	const char *snm = scnp->cn_nameptr;
	const char *tnm = tcnp->cn_nameptr;
	int error;

	VOP_UNLOCK1(tdvp);
	if (tvpp != NULL && tvpp != tdvp)
	VOP_UNLOCK1(*tvpp);

	relock:
	error = vn_lock(sdvp, LK_EXCLUSIVE);
	if (error)
	goto out;
	sdzp = VTOZ(sdvp);

	error = vn_lock(tdvp, LK_EXCLUSIVE \| LK_NOWAIT);
	if (error != 0) {
	VOP_UNLOCK1(sdvp);
	if (error != EBUSY)
	goto out;
	error = vn_lock(tdvp, LK_EXCLUSIVE);
	if (error)
	goto out;
	VOP_UNLOCK1(tdvp);
	goto relock;
	}
	tdzp = VTOZ(tdvp);

	/*
	* Before using sdzp and tdzp we must ensure that they are live.
	* As a porting legacy from illumos we have two things to worry
	* about. One is typical for FreeBSD and it is that the vnode is
	* not reclaimed (doomed). The other is that the znode is live.
	* The current code can invalidate the znode without acquiring the
	* corresponding vnode lock if the object represented by the znode
	* and vnode is no longer valid after a rollback or receive operation.
	* z_teardown_lock hidden behind ZFS_ENTER and ZFS_EXIT is the lock
	* that protects the znodes from the invalidation.
	*/
	zfsvfs = sdzp->z_zfsvfs;
	ASSERT3P(zfsvfs, ==, tdzp->z_zfsvfs);
	ZFS_ENTER(zfsvfs);

	/*
	* We can not use ZFS_VERIFY_ZP() here because it could directly return
	* bypassing the cleanup code in the case of an error.
	*/
	if (tdzp->z_sa_hdl == NULL \|\| sdzp->z_sa_hdl == NULL) {
	ZFS_EXIT(zfsvfs);
	VOP_UNLOCK1(sdvp);
	VOP_UNLOCK1(tdvp);
	error = SET_ERROR(EIO);
	goto out;
	}

	/*
	* Re-resolve svp to be certain it still exists and fetch the
	* correct vnode.
	*/
	error = zfs_dirent_lookup(sdzp, snm, &szp, ZEXISTS);
	if (error != 0) {
	/* Source entry invalid or not there. */
	ZFS_EXIT(zfsvfs);
	VOP_UNLOCK1(sdvp);
	VOP_UNLOCK1(tdvp);
	if ((scnp->cn_flags & ISDOTDOT) != 0 \|\|
	(scnp->cn_namelen == 1 && scnp->cn_nameptr[0] == '.'))
	error = SET_ERROR(EINVAL);
	goto out;
	}
	svp = ZTOV(szp);

	/*
	* Re-resolve tvp, if it disappeared we just carry on.
	*/
	error = zfs_dirent_lookup(tdzp, tnm, &tzp, 0);
	if (error != 0) {
	ZFS_EXIT(zfsvfs);
	VOP_UNLOCK1(sdvp);
	VOP_UNLOCK1(tdvp);
	vrele(svp);
	if ((tcnp->cn_flags & ISDOTDOT) != 0)
	error = SET_ERROR(EINVAL);
	goto out;
	}
	if (tzp != NULL)
	tvp = ZTOV(tzp);
	else
	tvp = NULL;

	/*
	* At present the vnode locks must be acquired before z_teardown_lock,
	* although it would be more logical to use the opposite order.
	*/
	ZFS_EXIT(zfsvfs);

	/*
	* Now try acquire locks on svp and tvp.
	*/
	nvp = svp;
	error = vn_lock(nvp, LK_EXCLUSIVE \| LK_NOWAIT);
	if (error != 0) {
	VOP_UNLOCK1(sdvp);
	VOP_UNLOCK1(tdvp);
	if (tvp != NULL)
	vrele(tvp);
	if (error != EBUSY) {
	vrele(nvp);
	goto out;
	}
	error = vn_lock(nvp, LK_EXCLUSIVE);
	if (error != 0) {
	vrele(nvp);
	goto out;
	}
	VOP_UNLOCK1(nvp);
	/*
	* Concurrent rename race.
	* XXX ?
	*/
	if (nvp == tdvp) {
	vrele(nvp);
	error = SET_ERROR(EINVAL);
	goto out;
	}
	vrele(*svpp);
	*svpp = nvp;
	goto relock;
	}
	vrele(*svpp);
	*svpp = nvp;

	if (*tvpp != NULL)
	vrele(*tvpp);
	*tvpp = NULL;
	if (tvp != NULL) {
	nvp = tvp;
	error = vn_lock(nvp, LK_EXCLUSIVE \| LK_NOWAIT);
	if (error != 0) {
	VOP_UNLOCK1(sdvp);
	VOP_UNLOCK1(tdvp);
	VOP_UNLOCK1(*svpp);
	if (error != EBUSY) {
	vrele(nvp);
	goto out;
	}
	error = vn_lock(nvp, LK_EXCLUSIVE);
	if (error != 0) {
	vrele(nvp);
	goto out;
	}
	vput(nvp);
	goto relock;
	}
	*tvpp = nvp;
	}

	return (0);

	out:
	return (error);
	}

	/*
	* Note that we must use VRELE_ASYNC in this function as it walks
	* up the directory tree and vrele may need to acquire an exclusive
	* lock if a last reference to a vnode is dropped.
	*/
	static int
	zfs_rename_check(znode_t szp, znode_t sdzp, znode_t *tdzp)
	{
	zfsvfs_t *zfsvfs;
	znode_t zp, zp1;
	uint64_t parent;
	int error;

	zfsvfs = tdzp->z_zfsvfs;
	if (tdzp == szp)
	return (SET_ERROR(EINVAL));
	if (tdzp == sdzp)
	return (0);
	if (tdzp->z_id == zfsvfs->z_root)
	return (0);
	zp = tdzp;
	for (;;) {
	ASSERT(!zp->z_unlinked);
	if ((error = sa_lookup(zp->z_sa_hdl,
	SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0)
	break;

	if (parent == szp->z_id) {
	error = SET_ERROR(EINVAL);
	break;
	}
	if (parent == zfsvfs->z_root)
	break;
	if (parent == sdzp->z_id)
	break;

	error = zfs_zget(zfsvfs, parent, &zp1);
	if (error != 0)
	break;

	if (zp != tdzp)
	VN_RELE_ASYNC(ZTOV(zp),
	dsl_pool_zrele_taskq(
	dmu_objset_pool(zfsvfs->z_os)));
	zp = zp1;
	}

	if (error == ENOTDIR)
	panic("checkpath: .. not a directory\n");
	if (zp != tdzp)
	VN_RELE_ASYNC(ZTOV(zp),
	dsl_pool_zrele_taskq(dmu_objset_pool(zfsvfs->z_os)));
	return (error);
	}

	#if __FreeBSD_version < 1300124
	static void
	cache_vop_rename(struct vnode fdvp, struct vnode fvp, struct vnode *tdvp,
	struct vnode tvp, struct componentname fcnp, struct componentname *tcnp)
	{

	cache_purge(fvp);
	if (tvp != NULL)
	cache_purge(tvp);
	cache_purge_negative(tdvp);
	}
	#endif

	/*
	* Move an entry from the provided source directory to the target
	* directory. Change the entry name as indicated.
	*
	* IN: sdvp - Source directory containing the "old entry".
	* snm - Old entry name.
	* tdvp - Target directory to contain the "new entry".
	* tnm - New entry name.
	* cr - credentials of caller.
	* ct - caller context
	* flags - case flags
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* sdvp,tdvp - ctime\|mtime updated
	*/
	/ARGSUSED/
	static int
	zfs_rename_(vnode_t sdvp, vnode_t svpp, struct componentname scnp,
	vnode_t tdvp, vnode_t tvpp, struct componentname tcnp,
	cred_t *cr, int log)
	{
	zfsvfs_t *zfsvfs;
	znode_t sdzp, tdzp, szp, tzp;
	zilog_t *zilog = NULL;
	dmu_tx_t *tx;
	const char *snm = scnp->cn_nameptr;
	const char *tnm = tcnp->cn_nameptr;
	int error = 0;
	bool want_seqc_end __maybe_unused = false;

	/* Reject renames across filesystems. */
	if ((*svpp)->v_mount != tdvp->v_mount \|\|
	((tvpp) != NULL && (svpp)->v_mount != (*tvpp)->v_mount)) {
	error = SET_ERROR(EXDEV);
	goto out;
	}

	if (zfsctl_is_node(tdvp)) {
	error = SET_ERROR(EXDEV);
	goto out;
	}

	/*
	* Lock all four vnodes to ensure safety and semantics of renaming.
	*/
	error = zfs_rename_relock(sdvp, svpp, tdvp, tvpp, scnp, tcnp);
	if (error != 0) {
	/* no vnodes are locked in the case of error here */
	return (error);
	}

	tdzp = VTOZ(tdvp);
	sdzp = VTOZ(sdvp);
	zfsvfs = tdzp->z_zfsvfs;
	zilog = zfsvfs->z_log;

	/*
	* After we re-enter ZFS_ENTER() we will have to revalidate all
	* znodes involved.
	*/
	ZFS_ENTER(zfsvfs);

	if (zfsvfs->z_utf8 && u8_validate(tnm,
	strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	error = SET_ERROR(EILSEQ);
	goto unlockout;
	}

	/* If source and target are the same file, there is nothing to do. */
	if ((svpp) == (tvpp)) {
	error = 0;
	goto unlockout;
	}

	if (((svpp)->v_type == VDIR && (svpp)->v_mountedhere != NULL) \|\|
	((tvpp) != NULL && (tvpp)->v_type == VDIR &&
	(*tvpp)->v_mountedhere != NULL)) {
	error = SET_ERROR(EXDEV);
	goto unlockout;
	}

	/*
	* We can not use ZFS_VERIFY_ZP() here because it could directly return
	* bypassing the cleanup code in the case of an error.
	*/
	if (tdzp->z_sa_hdl == NULL \|\| sdzp->z_sa_hdl == NULL) {
	error = SET_ERROR(EIO);
	goto unlockout;
	}

	szp = VTOZ(*svpp);
	tzp = tvpp == NULL ? NULL : VTOZ(tvpp);
	if (szp->z_sa_hdl == NULL \|\| (tzp != NULL && tzp->z_sa_hdl == NULL)) {
	error = SET_ERROR(EIO);
	goto unlockout;
	}

	/*
	* This is to prevent the creation of links into attribute space
	* by renaming a linked file into/outof an attribute directory.
	* See the comment in zfs_link() for why this is considered bad.
	*/
	if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
	error = SET_ERROR(EINVAL);
	goto unlockout;
	}

	/*
	* If we are using project inheritance, means if the directory has
	* ZFS_PROJINHERIT set, then its descendant directories will inherit
	* not only the project ID, but also the ZFS_PROJINHERIT flag. Under
	* such case, we only allow renames into our tree when the project
	* IDs are the same.
	*/
	if (tdzp->z_pflags & ZFS_PROJINHERIT &&
	tdzp->z_projid != szp->z_projid) {
	error = SET_ERROR(EXDEV);
	goto unlockout;
	}

	/*
	* Must have write access at the source to remove the old entry
	* and write access at the target to create the new entry.
	* Note that if target and source are the same, this can be
	* done in a single check.
	*/
	if ((error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)))
	goto unlockout;

	if ((*svpp)->v_type == VDIR) {
	/*
	* Avoid ".", "..", and aliases of "." for obvious reasons.
	*/
	if ((scnp->cn_namelen == 1 && scnp->cn_nameptr[0] == '.') \|\|
	sdzp == szp \|\|
	(scnp->cn_flags \| tcnp->cn_flags) & ISDOTDOT) {
	error = EINVAL;
	goto unlockout;
	}

	/*
	* Check to make sure rename is valid.
	* Can't do a move like this: /usr/a/b to /usr/a/b/c/d
	*/
	if ((error = zfs_rename_check(szp, sdzp, tdzp)))
	goto unlockout;
	}

	/*
	* Does target exist?
	*/
	if (tzp) {
	/*
	* Source and target must be the same type.
	*/
	if ((*svpp)->v_type == VDIR) {
	if ((*tvpp)->v_type != VDIR) {
	error = SET_ERROR(ENOTDIR);
	goto unlockout;
	} else {
	cache_purge(tdvp);
	if (sdvp != tdvp)
	cache_purge(sdvp);
	}
	} else {
	if ((*tvpp)->v_type == VDIR) {
	error = SET_ERROR(EISDIR);
	goto unlockout;
	}
	}
	}

	vn_seqc_write_begin(*svpp);
	vn_seqc_write_begin(sdvp);
	if (*tvpp != NULL)
	vn_seqc_write_begin(*tvpp);
	if (tdvp != *tvpp)
	vn_seqc_write_begin(tdvp);
	#if __FreeBSD_version >= 1300102
	want_seqc_end = true;
	#endif
	vnevent_rename_src(*svpp, sdvp, scnp->cn_nameptr, ct);
	if (tzp)
	vnevent_rename_dest(*tvpp, tdvp, tnm, ct);

	/*
	* notify the target directory if it is not the same
	* as source directory.
	*/
	if (tdvp != sdvp) {
	vnevent_rename_dest_dir(tdvp, ct);
	}

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
	dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
	if (sdzp != tdzp) {
	dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, tdzp);
	}
	if (tzp) {
	dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, tzp);
	}

	zfs_sa_upgrade_txholds(tx, szp);
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	goto unlockout;
	}


	if (tzp) /* Attempt to remove the existing target */
	error = zfs_link_destroy(tdzp, tnm, tzp, tx, 0, NULL);

	if (error == 0) {
	error = zfs_link_create(tdzp, tnm, szp, tx, ZRENAMING);
	if (error == 0) {
	szp->z_pflags \|= ZFS_AV_MODIFIED;

	error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
	(void *)&szp->z_pflags, sizeof (uint64_t), tx);
	ASSERT0(error);

	error = zfs_link_destroy(sdzp, snm, szp, tx, ZRENAMING,
	NULL);
	if (error == 0) {
	zfs_log_rename(zilog, tx, TX_RENAME, sdzp,
	snm, tdzp, tnm, szp);

	/*
	* Update path information for the target vnode
	*/
	vn_renamepath(tdvp, *svpp, tnm, strlen(tnm));
	} else {
	/*
	* At this point, we have successfully created
	* the target name, but have failed to remove
	* the source name. Since the create was done
	* with the ZRENAMING flag, there are
	* complications; for one, the link count is
	* wrong. The easiest way to deal with this
	* is to remove the newly created target, and
	* return the original error. This must
	* succeed; fortunately, it is very unlikely to
	* fail, since we just created it.
	*/
	- VERIFY3U(zfs_link_destroy(tdzp, tnm, szp, tx,
	- ZRENAMING, NULL), ==, 0);
	+ VERIFY0(zfs_link_destroy(tdzp, tnm, szp, tx,
	+ ZRENAMING, NULL));
	}
	}
	if (error == 0) {
	cache_vop_rename(sdvp, svpp, tdvp, tvpp, scnp, tcnp);
	}
	}

	dmu_tx_commit(tx);

	unlockout: /* all 4 vnodes are locked, ZFS_ENTER called */
	ZFS_EXIT(zfsvfs);
	if (want_seqc_end) {
	vn_seqc_write_end(*svpp);
	vn_seqc_write_end(sdvp);
	if (*tvpp != NULL)
	vn_seqc_write_end(*tvpp);
	if (tdvp != *tvpp)
	vn_seqc_write_end(tdvp);
	want_seqc_end = false;
	}
	VOP_UNLOCK1(*svpp);
	VOP_UNLOCK1(sdvp);

	out: /* original two vnodes are locked */
	MPASS(!want_seqc_end);
	if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	if (*tvpp != NULL)
	VOP_UNLOCK1(*tvpp);
	if (tdvp != *tvpp)
	VOP_UNLOCK1(tdvp);
	return (error);
	}

	int
	zfs_rename(znode_t sdzp, const char sname, znode_t tdzp, const char tname,
	cred_t *cr, int flags)
	{
	struct componentname scn, tcn;
	vnode_t sdvp, tdvp;
	vnode_t svp, tvp;
	int error;
	svp = tvp = NULL;

	sdvp = ZTOV(sdzp);
	tdvp = ZTOV(tdzp);
	error = zfs_lookup_internal(sdzp, sname, &svp, &scn, DELETE);
	if (sdzp->z_zfsvfs->z_replay == B_FALSE)
	VOP_UNLOCK1(sdvp);
	if (error != 0)
	goto fail;
	VOP_UNLOCK1(svp);

	vn_lock(tdvp, LK_EXCLUSIVE \| LK_RETRY);
	error = zfs_lookup_internal(tdzp, tname, &tvp, &tcn, RENAME);
	if (error == EJUSTRETURN)
	tvp = NULL;
	else if (error != 0) {
	VOP_UNLOCK1(tdvp);
	goto fail;
	}

	error = zfs_rename_(sdvp, &svp, &scn, tdvp, &tvp, &tcn, cr, 0);
	fail:
	if (svp != NULL)
	vrele(svp);
	if (tvp != NULL)
	vrele(tvp);

	return (error);
	}

	/*
	* Insert the indicated symbolic reference entry into the directory.
	*
	* IN: dvp - Directory to contain new symbolic link.
	* link - Name for new symlink entry.
	* vap - Attributes of new entry.
	* cr - credentials of caller.
	* ct - caller context
	* flags - case flags
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* dvp - ctime\|mtime updated
	*/
	/ARGSUSED/
	int
	zfs_symlink(znode_t dzp, const char name, vattr_t *vap,
	const char link, znode_t zpp, cred_t cr, int flags)
	{
	znode_t *zp;
	dmu_tx_t *tx;
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	zilog_t *zilog;
	uint64_t len = strlen(link);
	int error;
	zfs_acl_ids_t acl_ids;
	boolean_t fuid_dirtied;
	uint64_t txtype = TX_SYMLINK;

	- ASSERT(vap->va_type == VLNK);
	+ ASSERT3S(vap->va_type, ==, VLNK);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	zilog = zfsvfs->z_log;

	if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
	NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}

	if (len > MAXPATHLEN) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(ENAMETOOLONG));
	}

	if ((error = zfs_acl_ids_create(dzp, 0,
	vap, cr, NULL, &acl_ids)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Attempt to lock directory; fail if entry already exists.
	*/
	error = zfs_dirent_lookup(dzp, name, &zp, ZNEW);
	if (error) {
	zfs_acl_ids_free(&acl_ids);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
	zfs_acl_ids_free(&acl_ids);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if (zfs_acl_ids_overquota(zfsvfs, &acl_ids,
	0 /* projid */)) {
	zfs_acl_ids_free(&acl_ids);
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EDQUOT));
	}

	getnewvnode_reserve_();
	tx = dmu_tx_create(zfsvfs->z_os);
	fuid_dirtied = zfsvfs->z_fuid_dirty;
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
	dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
	ZFS_SA_BASE_ATTR_SIZE + len);
	dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
	if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
	acl_ids.z_aclp->z_acl_bytes);
	}
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_abort(tx);
	getnewvnode_drop_reserve();
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Create a new object for the symlink.
	* for version 4 ZPL datasets the symlink will be an SA attribute
	*/
	zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	if (zp->z_is_sa)
	error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs),
	__DECONST(void *, link), len, tx);
	else
	zfs_sa_symlink(zp, __DECONST(char *, link), len, tx);

	zp->z_size = len;
	(void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
	&zp->z_size, sizeof (zp->z_size), tx);
	/*
	* Insert the new object into the directory.
	*/
	(void) zfs_link_create(dzp, name, zp, tx, ZNEW);

	zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
	*zpp = zp;

	zfs_acl_ids_free(&acl_ids);

	dmu_tx_commit(tx);

	getnewvnode_drop_reserve();

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Return, in the buffer contained in the provided uio structure,
	* the symbolic path referred to by vp.
	*
	* IN: vp - vnode of symbolic link.
	* uio - structure to contain the link path.
	* cr - credentials of caller.
	* ct - caller context
	*
	* OUT: uio - structure containing the link path.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* vp - atime updated
	*/
	/* ARGSUSED */
	static int
	zfs_readlink(vnode_t vp, zfs_uio_t uio, cred_t cr, caller_context_t ct)
	{
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	int error;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	if (zp->z_is_sa)
	error = sa_lookup_uio(zp->z_sa_hdl,
	SA_ZPL_SYMLINK(zfsvfs), uio);
	else
	error = zfs_sa_readlink(zp, uio);

	ZFS_ACCESSTIME_STAMP(zfsvfs, zp);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Insert a new entry into directory tdvp referencing svp.
	*
	* IN: tdvp - Directory to contain new entry.
	* svp - vnode of new entry.
	* name - name of new entry.
	* cr - credentials of caller.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* tdvp - ctime\|mtime updated
	* svp - ctime updated
	*/
	/* ARGSUSED */
	int
	zfs_link(znode_t tdzp, znode_t szp, const char name, cred_t cr,
	int flags)
	{
	znode_t *tzp;
	zfsvfs_t *zfsvfs = tdzp->z_zfsvfs;
	zilog_t *zilog;
	dmu_tx_t *tx;
	int error;
	uint64_t parent;
	uid_t owner;

	- ASSERT(ZTOV(tdzp)->v_type == VDIR);
	+ ASSERT3S(ZTOV(tdzp)->v_type, ==, VDIR);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(tdzp);
	zilog = zfsvfs->z_log;

	/*
	* POSIX dictates that we return EPERM here.
	* Better choices include ENOTSUP or EISDIR.
	*/
	if (ZTOV(szp)->v_type == VDIR) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	ZFS_VERIFY_ZP(szp);

	/*
	* If we are using project inheritance, means if the directory has
	* ZFS_PROJINHERIT set, then its descendant directories will inherit
	* not only the project ID, but also the ZFS_PROJINHERIT flag. Under
	* such case, we only allow hard link creation in our tree when the
	* project IDs are the same.
	*/
	if (tdzp->z_pflags & ZFS_PROJINHERIT &&
	tdzp->z_projid != szp->z_projid) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EXDEV));
	}

	if (szp->z_pflags & (ZFS_APPENDONLY \|
	ZFS_IMMUTABLE \| ZFS_READONLY)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	/* Prevent links to .zfs/shares files */

	if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
	&parent, sizeof (uint64_t))) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	if (parent == zfsvfs->z_shares_dir) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	if (zfsvfs->z_utf8 && u8_validate(name,
	strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}

	/*
	* We do not support links between attributes and non-attributes
	* because of the potential security risk of creating links
	* into "normal" file space in order to circumvent restrictions
	* imposed in attribute space.
	*/
	if ((szp->z_pflags & ZFS_XATTR) != (tdzp->z_pflags & ZFS_XATTR)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}


	owner = zfs_fuid_map_id(zfsvfs, szp->z_uid, cr, ZFS_OWNER);
	if (owner != crgetuid(cr) && secpolicy_basic_link(ZTOV(szp), cr) != 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	if ((error = zfs_zaccess(tdzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Attempt to lock directory; fail if entry already exists.
	*/
	error = zfs_dirent_lookup(tdzp, name, &tzp, ZNEW);
	if (error) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, name);
	zfs_sa_upgrade_txholds(tx, szp);
	zfs_sa_upgrade_txholds(tx, tdzp);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	error = zfs_link_create(tdzp, name, szp, tx, 0);

	if (error == 0) {
	uint64_t txtype = TX_LINK;
	zfs_log_link(zilog, tx, txtype, tdzp, szp, name);
	}

	dmu_tx_commit(tx);

	if (error == 0) {
	vnevent_link(ZTOV(szp), ct);
	}

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Free or allocate space in a file. Currently, this function only
	* supports the `F_FREESP' command. However, this command is somewhat
	* misnamed, as its functionality includes the ability to allocate as
	* well as free space.
	*
	* IN: ip - inode of file to free data in.
	* cmd - action to take (only F_FREESP supported).
	* bfp - section of file to free/alloc.
	* flag - current file open mode flags.
	* offset - current file offset.
	* cr - credentials of caller.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* ip - ctime\|mtime updated
	*/
	/* ARGSUSED */
	int
	zfs_space(znode_t zp, int cmd, flock64_t bfp, int flag,
	offset_t offset, cred_t *cr)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	uint64_t off, len;
	int error;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	if (cmd != F_FREESP) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	/*
	* Callers might not be able to detect properly that we are read-only,
	* so check it explicitly here.
	*/
	if (zfs_is_readonly(zfsvfs)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EROFS));
	}

	if (bfp->l_len < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	/*
	* Permissions aren't checked on Solaris because on this OS
	* zfs_space() can only be called with an opened file handle.
	* On Linux we can get here through truncate_range() which
	* operates directly on inodes, so we need to check access rights.
	*/
	if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	off = bfp->l_start;
	len = bfp->l_len; /* 0 means from off to end of file */

	error = zfs_freesp(zp, off, len, flag, TRUE);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/ARGSUSED/
	static void
	zfs_inactive(vnode_t vp, cred_t cr, caller_context_t *ct)
	{
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	int error;

	ZFS_TEARDOWN_INACTIVE_ENTER_READ(zfsvfs);
	if (zp->z_sa_hdl == NULL) {
	/*
	* The fs has been unmounted, or we did a
	* suspend/resume and this file no longer exists.
	*/
	ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs);
	vrecycle(vp);
	return;
	}

	if (zp->z_unlinked) {
	/*
	* Fast path to recycle a vnode of a removed file.
	*/
	ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs);
	vrecycle(vp);
	return;
	}

	if (zp->z_atime_dirty && zp->z_unlinked == 0) {
	dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);

	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	} else {
	(void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
	(void *)&zp->z_atime, sizeof (zp->z_atime), tx);
	zp->z_atime_dirty = 0;
	dmu_tx_commit(tx);
	}
	}
	ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs);
	}


	CTASSERT(sizeof (struct zfid_short) <= sizeof (struct fid));
	CTASSERT(sizeof (struct zfid_long) <= sizeof (struct fid));

	/ARGSUSED/
	static int
	zfs_fid(vnode_t vp, fid_t fidp, caller_context_t *ct)
	{
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	uint32_t gen;
	uint64_t gen64;
	uint64_t object = zp->z_id;
	zfid_short_t *zfid;
	int size, i, error;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs),
	&gen64, sizeof (uint64_t))) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	gen = (uint32_t)gen64;

	size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN;
	fidp->fid_len = size;

	zfid = (zfid_short_t *)fidp;

	zfid->zf_len = size;

	for (i = 0; i < sizeof (zfid->zf_object); i++)
	zfid->zf_object[i] = (uint8_t)(object >> (8 * i));

	/* Must have a non-zero generation number to distinguish from .zfs */
	if (gen == 0)
	gen = 1;
	for (i = 0; i < sizeof (zfid->zf_gen); i++)
	zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));

	if (size == LONG_FID_LEN) {
	uint64_t objsetid = dmu_objset_id(zfsvfs->z_os);
	zfid_long_t *zlfid;

	zlfid = (zfid_long_t *)fidp;

	for (i = 0; i < sizeof (zlfid->zf_setid); i++)
	zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i));

	/* XXX - this should be the generation number for the objset */
	for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
	zlfid->zf_setgen[i] = 0;
	}

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	static int
	zfs_pathconf(vnode_t vp, int cmd, ulong_t valp, cred_t *cr,
	caller_context_t *ct)
	{
	znode_t *zp;
	zfsvfs_t *zfsvfs;

	switch (cmd) {
	case _PC_LINK_MAX:
	*valp = MIN(LONG_MAX, ZFS_LINK_MAX);
	return (0);

	case _PC_FILESIZEBITS:
	*valp = 64;
	return (0);
	case _PC_MIN_HOLE_SIZE:
	*valp = (int)SPA_MINBLOCKSIZE;
	return (0);
	case _PC_ACL_EXTENDED:
	#if 0 /* POSIX ACLs are not implemented for ZFS on FreeBSD yet. */
	zp = VTOZ(vp);
	zfsvfs = zp->z_zfsvfs;
	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);
	*valp = zfsvfs->z_acl_type == ZFSACLTYPE_POSIX ? 1 : 0;
	ZFS_EXIT(zfsvfs);
	#else
	*valp = 0;
	#endif
	return (0);

	case _PC_ACL_NFS4:
	zp = VTOZ(vp);
	zfsvfs = zp->z_zfsvfs;
	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);
	*valp = zfsvfs->z_acl_type == ZFS_ACLTYPE_NFSV4 ? 1 : 0;
	ZFS_EXIT(zfsvfs);
	return (0);

	case _PC_ACL_PATH_MAX:
	*valp = ACL_MAX_ENTRIES;
	return (0);

	default:
	return (EOPNOTSUPP);
	}
	}

	static int
	zfs_getpages(struct vnode vp, vm_page_t ma, int count, int *rbehind,
	int *rahead)
	{
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	objset_t *os = zp->z_zfsvfs->z_os;
	zfs_locked_range_t *lr;
	vm_object_t object;
	off_t start, end, obj_size;
	uint_t blksz;
	int pgsin_b, pgsin_a;
	int error;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	start = IDX_TO_OFF(ma[0]->pindex);
	end = IDX_TO_OFF(ma[count - 1]->pindex + 1);

	/*
	* Lock a range covering all required and optional pages.
	* Note that we need to handle the case of the block size growing.
	*/
	for (;;) {
	blksz = zp->z_blksz;
	lr = zfs_rangelock_tryenter(&zp->z_rangelock,
	rounddown(start, blksz),
	roundup(end, blksz) - rounddown(start, blksz), RL_READER);
	if (lr == NULL) {
	if (rahead != NULL) {
	*rahead = 0;
	rahead = NULL;
	}
	if (rbehind != NULL) {
	*rbehind = 0;
	rbehind = NULL;
	}
	break;
	}
	if (blksz == zp->z_blksz)
	break;
	zfs_rangelock_exit(lr);
	}

	object = ma[0]->object;
	zfs_vmobject_wlock(object);
	obj_size = object->un_pager.vnp.vnp_size;
	zfs_vmobject_wunlock(object);
	if (IDX_TO_OFF(ma[count - 1]->pindex) >= obj_size) {
	if (lr != NULL)
	zfs_rangelock_exit(lr);
	ZFS_EXIT(zfsvfs);
	return (zfs_vm_pagerret_bad);
	}

	pgsin_b = 0;
	if (rbehind != NULL) {
	pgsin_b = OFF_TO_IDX(start - rounddown(start, blksz));
	pgsin_b = MIN(*rbehind, pgsin_b);
	}

	pgsin_a = 0;
	if (rahead != NULL) {
	pgsin_a = OFF_TO_IDX(roundup(end, blksz) - end);
	if (end + IDX_TO_OFF(pgsin_a) >= obj_size)
	pgsin_a = OFF_TO_IDX(round_page(obj_size) - end);
	pgsin_a = MIN(*rahead, pgsin_a);
	}

	/*
	* NB: we need to pass the exact byte size of the data that we expect
	* to read after accounting for the file size. This is required because
	* ZFS will panic if we request DMU to read beyond the end of the last
	* allocated block.
	*/
	error = dmu_read_pages(os, zp->z_id, ma, count, &pgsin_b, &pgsin_a,
	MIN(end, obj_size) - (end - PAGE_SIZE));

	if (lr != NULL)
	zfs_rangelock_exit(lr);
	ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
	ZFS_EXIT(zfsvfs);

	if (error != 0)
	return (zfs_vm_pagerret_error);

	VM_CNT_INC(v_vnodein);
	VM_CNT_ADD(v_vnodepgsin, count + pgsin_b + pgsin_a);
	if (rbehind != NULL)
	*rbehind = pgsin_b;
	if (rahead != NULL)
	*rahead = pgsin_a;
	return (zfs_vm_pagerret_ok);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_getpages_args {
	struct vnode *a_vp;
	vm_page_t *a_m;
	int a_count;
	int *a_rbehind;
	int *a_rahead;
	};
	#endif

	static int
	zfs_freebsd_getpages(struct vop_getpages_args *ap)
	{

	return (zfs_getpages(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind,
	ap->a_rahead));
	}

	static int
	zfs_putpages(struct vnode vp, vm_page_t ma, size_t len, int flags,
	int *rtvals)
	{
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	zfs_locked_range_t *lr;
	dmu_tx_t *tx;
	struct sf_buf *sf;
	vm_object_t object;
	vm_page_t m;
	caddr_t va;
	size_t tocopy;
	size_t lo_len;
	vm_ooffset_t lo_off;
	vm_ooffset_t off;
	uint_t blksz;
	int ncount;
	int pcount;
	int err;
	int i;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	object = vp->v_object;
	pcount = btoc(len);
	ncount = pcount;

	KASSERT(ma[0]->object == object, ("mismatching object"));
	KASSERT(len > 0 && (len & PAGE_MASK) == 0, ("unexpected length"));

	for (i = 0; i < pcount; i++)
	rtvals[i] = zfs_vm_pagerret_error;

	off = IDX_TO_OFF(ma[0]->pindex);
	blksz = zp->z_blksz;
	lo_off = rounddown(off, blksz);
	lo_len = roundup(len + (off - lo_off), blksz);
	lr = zfs_rangelock_enter(&zp->z_rangelock, lo_off, lo_len, RL_WRITER);

	zfs_vmobject_wlock(object);
	if (len + off > object->un_pager.vnp.vnp_size) {
	if (object->un_pager.vnp.vnp_size > off) {
	int pgoff;

	len = object->un_pager.vnp.vnp_size - off;
	ncount = btoc(len);
	if ((pgoff = (int)len & PAGE_MASK) != 0) {
	/*
	* If the object is locked and the following
	* conditions hold, then the page's dirty
	* field cannot be concurrently changed by a
	* pmap operation.
	*/
	m = ma[ncount - 1];
	vm_page_assert_sbusied(m);
	KASSERT(!pmap_page_is_write_mapped(m),
	("zfs_putpages: page %p is not read-only",
	m));
	vm_page_clear_dirty(m, pgoff, PAGE_SIZE -
	pgoff);
	}
	} else {
	len = 0;
	ncount = 0;
	}
	if (ncount < pcount) {
	for (i = ncount; i < pcount; i++) {
	rtvals[i] = zfs_vm_pagerret_bad;
	}
	}
	}
	zfs_vmobject_wunlock(object);

	if (ncount == 0)
	goto out;

	if (zfs_id_overblockquota(zfsvfs, DMU_USERUSED_OBJECT, zp->z_uid) \|\|
	zfs_id_overblockquota(zfsvfs, DMU_GROUPUSED_OBJECT, zp->z_gid) \|\|
	(zp->z_projid != ZFS_DEFAULT_PROJID &&
	zfs_id_overblockquota(zfsvfs, DMU_PROJECTUSED_OBJECT,
	zp->z_projid))) {
	goto out;
	}

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_write(tx, zp->z_id, off, len);

	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	err = dmu_tx_assign(tx, TXG_WAIT);
	if (err != 0) {
	dmu_tx_abort(tx);
	goto out;
	}

	if (zp->z_blksz < PAGE_SIZE) {
	for (i = 0; len > 0; off += tocopy, len -= tocopy, i++) {
	tocopy = len > PAGE_SIZE ? PAGE_SIZE : len;
	va = zfs_map_page(ma[i], &sf);
	dmu_write(zfsvfs->z_os, zp->z_id, off, tocopy, va, tx);
	zfs_unmap_page(sf);
	}
	} else {
	err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, ma, tx);
	}

	if (err == 0) {
	uint64_t mtime[2], ctime[2];
	sa_bulk_attr_t bulk[3];
	int count = 0;

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
	&mtime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	&ctime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, 8);
	zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
	err = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
	ASSERT0(err);
	/*
	* XXX we should be passing a callback to undirty
	* but that would make the locking messier
	*/
	zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off,
	len, 0, NULL, NULL);

	zfs_vmobject_wlock(object);
	for (i = 0; i < ncount; i++) {
	rtvals[i] = zfs_vm_pagerret_ok;
	vm_page_undirty(ma[i]);
	}
	zfs_vmobject_wunlock(object);
	VM_CNT_INC(v_vnodeout);
	VM_CNT_ADD(v_vnodepgsout, ncount);
	}
	dmu_tx_commit(tx);

	out:
	zfs_rangelock_exit(lr);
	if ((flags & (zfs_vm_pagerput_sync \| zfs_vm_pagerput_inval)) != 0 \|\|
	zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zfsvfs->z_log, zp->z_id);
	ZFS_EXIT(zfsvfs);
	return (rtvals[0]);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_putpages_args {
	struct vnode *a_vp;
	vm_page_t *a_m;
	int a_count;
	int a_sync;
	int *a_rtvals;
	};
	#endif

	static int
	zfs_freebsd_putpages(struct vop_putpages_args *ap)
	{

	return (zfs_putpages(ap->a_vp, ap->a_m, ap->a_count, ap->a_sync,
	ap->a_rtvals));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_bmap_args {
	struct vnode *a_vp;
	daddr_t a_bn;
	struct bufobj **a_bop;
	daddr_t *a_bnp;
	int *a_runp;
	int *a_runb;
	};
	#endif

	static int
	zfs_freebsd_bmap(struct vop_bmap_args *ap)
	{

	if (ap->a_bop != NULL)
	*ap->a_bop = &ap->a_vp->v_bufobj;
	if (ap->a_bnp != NULL)
	*ap->a_bnp = ap->a_bn;
	if (ap->a_runp != NULL)
	*ap->a_runp = 0;
	if (ap->a_runb != NULL)
	*ap->a_runb = 0;

	return (0);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_open_args {
	struct vnode *a_vp;
	int a_mode;
	struct ucred *a_cred;
	struct thread *a_td;
	};
	#endif

	static int
	zfs_freebsd_open(struct vop_open_args *ap)
	{
	vnode_t *vp = ap->a_vp;
	znode_t *zp = VTOZ(vp);
	int error;

	error = zfs_open(&vp, ap->a_mode, ap->a_cred);
	if (error == 0)
	vnode_create_vobject(vp, zp->z_size, ap->a_td);
	return (error);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_close_args {
	struct vnode *a_vp;
	int a_fflag;
	struct ucred *a_cred;
	struct thread *a_td;
	};
	#endif

	static int
	zfs_freebsd_close(struct vop_close_args *ap)
	{

	return (zfs_close(ap->a_vp, ap->a_fflag, 1, 0, ap->a_cred));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_ioctl_args {
	struct vnode *a_vp;
	ulong_t a_command;
	caddr_t a_data;
	int a_fflag;
	struct ucred *cred;
	struct thread *td;
	};
	#endif

	static int
	zfs_freebsd_ioctl(struct vop_ioctl_args *ap)
	{

	return (zfs_ioctl(ap->a_vp, ap->a_command, (intptr_t)ap->a_data,
	ap->a_fflag, ap->a_cred, NULL));
	}

	static int
	ioflags(int ioflags)
	{
	int flags = 0;

	if (ioflags & IO_APPEND)
	flags \|= FAPPEND;
	if (ioflags & IO_NDELAY)
	flags \|= FNONBLOCK;
	if (ioflags & IO_SYNC)
	flags \|= (FSYNC \| FDSYNC \| FRSYNC);

	return (flags);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_read_args {
	struct vnode *a_vp;
	struct uio *a_uio;
	int a_ioflag;
	struct ucred *a_cred;
	};
	#endif

	static int
	zfs_freebsd_read(struct vop_read_args *ap)
	{
	zfs_uio_t uio;
	zfs_uio_init(&uio, ap->a_uio);
	return (zfs_read(VTOZ(ap->a_vp), &uio, ioflags(ap->a_ioflag),
	ap->a_cred));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_write_args {
	struct vnode *a_vp;
	struct uio *a_uio;
	int a_ioflag;
	struct ucred *a_cred;
	};
	#endif

	static int
	zfs_freebsd_write(struct vop_write_args *ap)
	{
	zfs_uio_t uio;
	zfs_uio_init(&uio, ap->a_uio);
	return (zfs_write(VTOZ(ap->a_vp), &uio, ioflags(ap->a_ioflag),
	ap->a_cred));
	}

	#if __FreeBSD_version >= 1300102
	/*
	* VOP_FPLOOKUP_VEXEC routines are subject to special circumstances, see
	* the comment above cache_fplookup for details.
	*/
	static int
	zfs_freebsd_fplookup_vexec(struct vop_fplookup_vexec_args *v)
	{
	vnode_t *vp;
	znode_t *zp;
	uint64_t pflags;

	vp = v->a_vp;
	zp = VTOZ_SMR(vp);
	if (__predict_false(zp == NULL))
	return (EAGAIN);
	pflags = atomic_load_64(&zp->z_pflags);
	if (pflags & ZFS_AV_QUARANTINED)
	return (EAGAIN);
	if (pflags & ZFS_XATTR)
	return (EAGAIN);
	if ((pflags & ZFS_NO_EXECS_DENIED) == 0)
	return (EAGAIN);
	return (0);
	}
	#endif

	#if __FreeBSD_version >= 1300139
	static int
	zfs_freebsd_fplookup_symlink(struct vop_fplookup_symlink_args *v)
	{
	vnode_t *vp;
	znode_t *zp;
	char *target;

	vp = v->a_vp;
	zp = VTOZ_SMR(vp);
	if (__predict_false(zp == NULL)) {
	return (EAGAIN);
	}

	target = atomic_load_consume_ptr(&zp->z_cached_symlink);
	if (target == NULL) {
	return (EAGAIN);
	}
	return (cache_symlink_resolve(v->a_fpl, target, strlen(target)));
	}
	#endif

	#ifndef _SYS_SYSPROTO_H_
	struct vop_access_args {
	struct vnode *a_vp;
	accmode_t a_accmode;
	struct ucred *a_cred;
	struct thread *a_td;
	};
	#endif

	static int
	zfs_freebsd_access(struct vop_access_args *ap)
	{
	vnode_t *vp = ap->a_vp;
	znode_t *zp = VTOZ(vp);
	accmode_t accmode;
	int error = 0;


	if (ap->a_accmode == VEXEC) {
	if (zfs_fastaccesschk_execute(zp, ap->a_cred) == 0)
	return (0);
	}

	/*
	* ZFS itself only knowns about VREAD, VWRITE, VEXEC and VAPPEND,
	*/
	accmode = ap->a_accmode & (VREAD\|VWRITE\|VEXEC\|VAPPEND);
	if (accmode != 0)
	error = zfs_access(zp, accmode, 0, ap->a_cred);

	/*
	* VADMIN has to be handled by vaccess().
	*/
	if (error == 0) {
	accmode = ap->a_accmode & ~(VREAD\|VWRITE\|VEXEC\|VAPPEND);
	if (accmode != 0) {
	#if __FreeBSD_version >= 1300105
	error = vaccess(vp->v_type, zp->z_mode, zp->z_uid,
	zp->z_gid, accmode, ap->a_cred);
	#else
	error = vaccess(vp->v_type, zp->z_mode, zp->z_uid,
	zp->z_gid, accmode, ap->a_cred, NULL);
	#endif
	}
	}

	/*
	* For VEXEC, ensure that at least one execute bit is set for
	* non-directories.
	*/
	if (error == 0 && (ap->a_accmode & VEXEC) != 0 && vp->v_type != VDIR &&
	(zp->z_mode & (S_IXUSR \| S_IXGRP \| S_IXOTH)) == 0) {
	error = EACCES;
	}

	return (error);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_lookup_args {
	struct vnode *a_dvp;
	struct vnode **a_vpp;
	struct componentname *a_cnp;
	};
	#endif

	static int
	zfs_freebsd_lookup(struct vop_lookup_args *ap, boolean_t cached)
	{
	struct componentname *cnp = ap->a_cnp;
	char nm[NAME_MAX + 1];

	- ASSERT(cnp->cn_namelen < sizeof (nm));
	+ ASSERT3U(cnp->cn_namelen, <, sizeof (nm));
	strlcpy(nm, cnp->cn_nameptr, MIN(cnp->cn_namelen + 1, sizeof (nm)));

	return (zfs_lookup(ap->a_dvp, nm, ap->a_vpp, cnp, cnp->cn_nameiop,
	cnp->cn_cred, cnp->cn_thread, 0, cached));
	}

	static int
	zfs_freebsd_cachedlookup(struct vop_cachedlookup_args *ap)
	{

	return (zfs_freebsd_lookup((struct vop_lookup_args *)ap, B_TRUE));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_lookup_args {
	struct vnode *a_dvp;
	struct vnode **a_vpp;
	struct componentname *a_cnp;
	};
	#endif

	static int
	zfs_cache_lookup(struct vop_lookup_args *ap)
	{
	zfsvfs_t *zfsvfs;

	zfsvfs = ap->a_dvp->v_mount->mnt_data;
	if (zfsvfs->z_use_namecache)
	return (vfs_cache_lookup(ap));
	else
	return (zfs_freebsd_lookup(ap, B_FALSE));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_create_args {
	struct vnode *a_dvp;
	struct vnode **a_vpp;
	struct componentname *a_cnp;
	struct vattr *a_vap;
	};
	#endif

	static int
	zfs_freebsd_create(struct vop_create_args *ap)
	{
	zfsvfs_t *zfsvfs;
	struct componentname *cnp = ap->a_cnp;
	vattr_t *vap = ap->a_vap;
	znode_t *zp = NULL;
	int rc, mode;

	ASSERT(cnp->cn_flags & SAVENAME);

	vattr_init_mask(vap);
	mode = vap->va_mode & ALLPERMS;
	zfsvfs = ap->a_dvp->v_mount->mnt_data;
	*ap->a_vpp = NULL;

	rc = zfs_create(VTOZ(ap->a_dvp), cnp->cn_nameptr, vap, !EXCL, mode,
	&zp, cnp->cn_cred, 0 /* flag /, NULL / vsecattr */);
	if (rc == 0)
	*ap->a_vpp = ZTOV(zp);
	if (zfsvfs->z_use_namecache &&
	rc == 0 && (cnp->cn_flags & MAKEENTRY) != 0)
	cache_enter(ap->a_dvp, *ap->a_vpp, cnp);

	return (rc);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_remove_args {
	struct vnode *a_dvp;
	struct vnode *a_vp;
	struct componentname *a_cnp;
	};
	#endif

	static int
	zfs_freebsd_remove(struct vop_remove_args *ap)
	{

	ASSERT(ap->a_cnp->cn_flags & SAVENAME);

	return (zfs_remove_(ap->a_dvp, ap->a_vp, ap->a_cnp->cn_nameptr,
	ap->a_cnp->cn_cred));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_mkdir_args {
	struct vnode *a_dvp;
	struct vnode **a_vpp;
	struct componentname *a_cnp;
	struct vattr *a_vap;
	};
	#endif

	static int
	zfs_freebsd_mkdir(struct vop_mkdir_args *ap)
	{
	vattr_t *vap = ap->a_vap;
	znode_t *zp = NULL;
	int rc;

	ASSERT(ap->a_cnp->cn_flags & SAVENAME);

	vattr_init_mask(vap);
	*ap->a_vpp = NULL;

	rc = zfs_mkdir(VTOZ(ap->a_dvp), ap->a_cnp->cn_nameptr, vap, &zp,
	ap->a_cnp->cn_cred, 0, NULL);

	if (rc == 0)
	*ap->a_vpp = ZTOV(zp);
	return (rc);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_rmdir_args {
	struct vnode *a_dvp;
	struct vnode *a_vp;
	struct componentname *a_cnp;
	};
	#endif

	static int
	zfs_freebsd_rmdir(struct vop_rmdir_args *ap)
	{
	struct componentname *cnp = ap->a_cnp;

	ASSERT(cnp->cn_flags & SAVENAME);

	return (zfs_rmdir_(ap->a_dvp, ap->a_vp, cnp->cn_nameptr, cnp->cn_cred));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_readdir_args {
	struct vnode *a_vp;
	struct uio *a_uio;
	struct ucred *a_cred;
	int *a_eofflag;
	int *a_ncookies;
	ulong_t **a_cookies;
	};
	#endif

	static int
	zfs_freebsd_readdir(struct vop_readdir_args *ap)
	{
	zfs_uio_t uio;
	zfs_uio_init(&uio, ap->a_uio);
	return (zfs_readdir(ap->a_vp, &uio, ap->a_cred, ap->a_eofflag,
	ap->a_ncookies, ap->a_cookies));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_fsync_args {
	struct vnode *a_vp;
	int a_waitfor;
	struct thread *a_td;
	};
	#endif

	static int
	zfs_freebsd_fsync(struct vop_fsync_args *ap)
	{

	vop_stdfsync(ap);
	return (zfs_fsync(VTOZ(ap->a_vp), 0, ap->a_td->td_ucred));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_getattr_args {
	struct vnode *a_vp;
	struct vattr *a_vap;
	struct ucred *a_cred;
	};
	#endif

	static int
	zfs_freebsd_getattr(struct vop_getattr_args *ap)
	{
	vattr_t *vap = ap->a_vap;
	xvattr_t xvap;
	ulong_t fflags = 0;
	int error;

	xva_init(&xvap);
	xvap.xva_vattr = *vap;
	xvap.xva_vattr.va_mask \|= AT_XVATTR;

	/* Convert chflags into ZFS-type flags. */
	/* XXX: what about SF_SETTABLE?. */
	XVA_SET_REQ(&xvap, XAT_IMMUTABLE);
	XVA_SET_REQ(&xvap, XAT_APPENDONLY);
	XVA_SET_REQ(&xvap, XAT_NOUNLINK);
	XVA_SET_REQ(&xvap, XAT_NODUMP);
	XVA_SET_REQ(&xvap, XAT_READONLY);
	XVA_SET_REQ(&xvap, XAT_ARCHIVE);
	XVA_SET_REQ(&xvap, XAT_SYSTEM);
	XVA_SET_REQ(&xvap, XAT_HIDDEN);
	XVA_SET_REQ(&xvap, XAT_REPARSE);
	XVA_SET_REQ(&xvap, XAT_OFFLINE);
	XVA_SET_REQ(&xvap, XAT_SPARSE);

	error = zfs_getattr(ap->a_vp, (vattr_t *)&xvap, 0, ap->a_cred);
	if (error != 0)
	return (error);

	/* Convert ZFS xattr into chflags. */
	#define FLAG_CHECK(fflag, xflag, xfield) do { \
	if (XVA_ISSET_RTN(&xvap, (xflag)) && (xfield) != 0) \
	fflags \|= (fflag); \
	} while (0)
	FLAG_CHECK(SF_IMMUTABLE, XAT_IMMUTABLE,
	xvap.xva_xoptattrs.xoa_immutable);
	FLAG_CHECK(SF_APPEND, XAT_APPENDONLY,
	xvap.xva_xoptattrs.xoa_appendonly);
	FLAG_CHECK(SF_NOUNLINK, XAT_NOUNLINK,
	xvap.xva_xoptattrs.xoa_nounlink);
	FLAG_CHECK(UF_ARCHIVE, XAT_ARCHIVE,
	xvap.xva_xoptattrs.xoa_archive);
	FLAG_CHECK(UF_NODUMP, XAT_NODUMP,
	xvap.xva_xoptattrs.xoa_nodump);
	FLAG_CHECK(UF_READONLY, XAT_READONLY,
	xvap.xva_xoptattrs.xoa_readonly);
	FLAG_CHECK(UF_SYSTEM, XAT_SYSTEM,
	xvap.xva_xoptattrs.xoa_system);
	FLAG_CHECK(UF_HIDDEN, XAT_HIDDEN,
	xvap.xva_xoptattrs.xoa_hidden);
	FLAG_CHECK(UF_REPARSE, XAT_REPARSE,
	xvap.xva_xoptattrs.xoa_reparse);
	FLAG_CHECK(UF_OFFLINE, XAT_OFFLINE,
	xvap.xva_xoptattrs.xoa_offline);
	FLAG_CHECK(UF_SPARSE, XAT_SPARSE,
	xvap.xva_xoptattrs.xoa_sparse);

	#undef FLAG_CHECK
	*vap = xvap.xva_vattr;
	vap->va_flags = fflags;
	return (0);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_setattr_args {
	struct vnode *a_vp;
	struct vattr *a_vap;
	struct ucred *a_cred;
	};
	#endif

	static int
	zfs_freebsd_setattr(struct vop_setattr_args *ap)
	{
	vnode_t *vp = ap->a_vp;
	vattr_t *vap = ap->a_vap;
	cred_t *cred = ap->a_cred;
	xvattr_t xvap;
	ulong_t fflags;
	uint64_t zflags;

	vattr_init_mask(vap);
	vap->va_mask &= ~AT_NOSET;

	xva_init(&xvap);
	xvap.xva_vattr = *vap;

	zflags = VTOZ(vp)->z_pflags;

	if (vap->va_flags != VNOVAL) {
	zfsvfs_t *zfsvfs = VTOZ(vp)->z_zfsvfs;
	int error;

	if (zfsvfs->z_use_fuids == B_FALSE)
	return (EOPNOTSUPP);

	fflags = vap->va_flags;
	/*
	* XXX KDM
	* We need to figure out whether it makes sense to allow
	* UF_REPARSE through, since we don't really have other
	* facilities to handle reparse points and zfs_setattr()
	* doesn't currently allow setting that attribute anyway.
	*/
	if ((fflags & ~(SF_IMMUTABLE\|SF_APPEND\|SF_NOUNLINK\|UF_ARCHIVE\|
	UF_NODUMP\|UF_SYSTEM\|UF_HIDDEN\|UF_READONLY\|UF_REPARSE\|
	UF_OFFLINE\|UF_SPARSE)) != 0)
	return (EOPNOTSUPP);
	/*
	* Unprivileged processes are not permitted to unset system
	* flags, or modify flags if any system flags are set.
	* Privileged non-jail processes may not modify system flags
	* if securelevel > 0 and any existing system flags are set.
	* Privileged jail processes behave like privileged non-jail
	* processes if the PR_ALLOW_CHFLAGS permission bit is set;
	* otherwise, they behave like unprivileged processes.
	*/
	if (secpolicy_fs_owner(vp->v_mount, cred) == 0 \|\|
	spl_priv_check_cred(cred, PRIV_VFS_SYSFLAGS) == 0) {
	if (zflags &
	(ZFS_IMMUTABLE \| ZFS_APPENDONLY \| ZFS_NOUNLINK)) {
	error = securelevel_gt(cred, 0);
	if (error != 0)
	return (error);
	}
	} else {
	/*
	* Callers may only modify the file flags on
	* objects they have VADMIN rights for.
	*/
	if ((error = VOP_ACCESS(vp, VADMIN, cred,
	curthread)) != 0)
	return (error);
	if (zflags &
	(ZFS_IMMUTABLE \| ZFS_APPENDONLY \|
	ZFS_NOUNLINK)) {
	return (EPERM);
	}
	if (fflags &
	(SF_IMMUTABLE \| SF_APPEND \| SF_NOUNLINK)) {
	return (EPERM);
	}
	}

	#define FLAG_CHANGE(fflag, zflag, xflag, xfield) do { \
	if (((fflags & (fflag)) && !(zflags & (zflag))) \|\| \
	((zflags & (zflag)) && !(fflags & (fflag)))) { \
	XVA_SET_REQ(&xvap, (xflag)); \
	(xfield) = ((fflags & (fflag)) != 0); \
	} \
	} while (0)
	/* Convert chflags into ZFS-type flags. */
	/* XXX: what about SF_SETTABLE?. */
	FLAG_CHANGE(SF_IMMUTABLE, ZFS_IMMUTABLE, XAT_IMMUTABLE,
	xvap.xva_xoptattrs.xoa_immutable);
	FLAG_CHANGE(SF_APPEND, ZFS_APPENDONLY, XAT_APPENDONLY,
	xvap.xva_xoptattrs.xoa_appendonly);
	FLAG_CHANGE(SF_NOUNLINK, ZFS_NOUNLINK, XAT_NOUNLINK,
	xvap.xva_xoptattrs.xoa_nounlink);
	FLAG_CHANGE(UF_ARCHIVE, ZFS_ARCHIVE, XAT_ARCHIVE,
	xvap.xva_xoptattrs.xoa_archive);
	FLAG_CHANGE(UF_NODUMP, ZFS_NODUMP, XAT_NODUMP,
	xvap.xva_xoptattrs.xoa_nodump);
	FLAG_CHANGE(UF_READONLY, ZFS_READONLY, XAT_READONLY,
	xvap.xva_xoptattrs.xoa_readonly);
	FLAG_CHANGE(UF_SYSTEM, ZFS_SYSTEM, XAT_SYSTEM,
	xvap.xva_xoptattrs.xoa_system);
	FLAG_CHANGE(UF_HIDDEN, ZFS_HIDDEN, XAT_HIDDEN,
	xvap.xva_xoptattrs.xoa_hidden);
	FLAG_CHANGE(UF_REPARSE, ZFS_REPARSE, XAT_REPARSE,
	xvap.xva_xoptattrs.xoa_reparse);
	FLAG_CHANGE(UF_OFFLINE, ZFS_OFFLINE, XAT_OFFLINE,
	xvap.xva_xoptattrs.xoa_offline);
	FLAG_CHANGE(UF_SPARSE, ZFS_SPARSE, XAT_SPARSE,
	xvap.xva_xoptattrs.xoa_sparse);
	#undef FLAG_CHANGE
	}
	if (vap->va_birthtime.tv_sec != VNOVAL) {
	xvap.xva_vattr.va_mask \|= AT_XVATTR;
	XVA_SET_REQ(&xvap, XAT_CREATETIME);
	}
	return (zfs_setattr(VTOZ(vp), (vattr_t *)&xvap, 0, cred));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_rename_args {
	struct vnode *a_fdvp;
	struct vnode *a_fvp;
	struct componentname *a_fcnp;
	struct vnode *a_tdvp;
	struct vnode *a_tvp;
	struct componentname *a_tcnp;
	};
	#endif

	static int
	zfs_freebsd_rename(struct vop_rename_args *ap)
	{
	vnode_t *fdvp = ap->a_fdvp;
	vnode_t *fvp = ap->a_fvp;
	vnode_t *tdvp = ap->a_tdvp;
	vnode_t *tvp = ap->a_tvp;
	int error;

	ASSERT(ap->a_fcnp->cn_flags & (SAVENAME\|SAVESTART));
	ASSERT(ap->a_tcnp->cn_flags & (SAVENAME\|SAVESTART));

	error = zfs_rename_(fdvp, &fvp, ap->a_fcnp, tdvp, &tvp,
	ap->a_tcnp, ap->a_fcnp->cn_cred, 1);

	vrele(fdvp);
	vrele(fvp);
	vrele(tdvp);
	if (tvp != NULL)
	vrele(tvp);

	return (error);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_symlink_args {
	struct vnode *a_dvp;
	struct vnode **a_vpp;
	struct componentname *a_cnp;
	struct vattr *a_vap;
	char *a_target;
	};
	#endif

	static int
	zfs_freebsd_symlink(struct vop_symlink_args *ap)
	{
	struct componentname *cnp = ap->a_cnp;
	vattr_t *vap = ap->a_vap;
	znode_t *zp = NULL;
	#if __FreeBSD_version >= 1300139
	char *symlink;
	size_t symlink_len;
	#endif
	int rc;

	ASSERT(cnp->cn_flags & SAVENAME);

	vap->va_type = VLNK; /* FreeBSD: Syscall only sets va_mode. */
	vattr_init_mask(vap);
	*ap->a_vpp = NULL;

	rc = zfs_symlink(VTOZ(ap->a_dvp), cnp->cn_nameptr, vap,
	ap->a_target, &zp, cnp->cn_cred, 0 /* flags */);
	if (rc == 0) {
	*ap->a_vpp = ZTOV(zp);
	ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
	#if __FreeBSD_version >= 1300139
	MPASS(zp->z_cached_symlink == NULL);
	symlink_len = strlen(ap->a_target);
	symlink = cache_symlink_alloc(symlink_len + 1, M_WAITOK);
	if (symlink != NULL) {
	memcpy(symlink, ap->a_target, symlink_len);
	symlink[symlink_len] = '\0';
	atomic_store_rel_ptr((uintptr_t *)&zp->z_cached_symlink,
	(uintptr_t)symlink);
	}
	#endif
	}
	return (rc);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_readlink_args {
	struct vnode *a_vp;
	struct uio *a_uio;
	struct ucred *a_cred;
	};
	#endif

	static int
	zfs_freebsd_readlink(struct vop_readlink_args *ap)
	{
	zfs_uio_t uio;
	int error;
	#if __FreeBSD_version >= 1300139
	znode_t *zp = VTOZ(ap->a_vp);
	char symlink, base;
	size_t symlink_len;
	bool trycache;
	#endif

	zfs_uio_init(&uio, ap->a_uio);
	#if __FreeBSD_version >= 1300139
	trycache = false;
	if (zfs_uio_segflg(&uio) == UIO_SYSSPACE &&
	zfs_uio_iovcnt(&uio) == 1) {
	base = zfs_uio_iovbase(&uio, 0);
	symlink_len = zfs_uio_iovlen(&uio, 0);
	trycache = true;
	}
	#endif
	error = zfs_readlink(ap->a_vp, &uio, ap->a_cred, NULL);
	#if __FreeBSD_version >= 1300139
	if (atomic_load_ptr(&zp->z_cached_symlink) != NULL \|\|
	error != 0 \|\| !trycache) {
	return (error);
	}
	symlink_len -= zfs_uio_resid(&uio);
	symlink = cache_symlink_alloc(symlink_len + 1, M_WAITOK);
	if (symlink != NULL) {
	memcpy(symlink, base, symlink_len);
	symlink[symlink_len] = '\0';
	if (!atomic_cmpset_rel_ptr((uintptr_t *)&zp->z_cached_symlink,
	(uintptr_t)NULL, (uintptr_t)symlink)) {
	cache_symlink_free(symlink, symlink_len + 1);
	}
	}
	#endif
	return (error);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_link_args {
	struct vnode *a_tdvp;
	struct vnode *a_vp;
	struct componentname *a_cnp;
	};
	#endif

	static int
	zfs_freebsd_link(struct vop_link_args *ap)
	{
	struct componentname *cnp = ap->a_cnp;
	vnode_t *vp = ap->a_vp;
	vnode_t *tdvp = ap->a_tdvp;

	if (tdvp->v_mount != vp->v_mount)
	return (EXDEV);

	ASSERT(cnp->cn_flags & SAVENAME);

	return (zfs_link(VTOZ(tdvp), VTOZ(vp),
	cnp->cn_nameptr, cnp->cn_cred, 0));
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_inactive_args {
	struct vnode *a_vp;
	struct thread *a_td;
	};
	#endif

	static int
	zfs_freebsd_inactive(struct vop_inactive_args *ap)
	{
	vnode_t *vp = ap->a_vp;

	#if __FreeBSD_version >= 1300123
	zfs_inactive(vp, curthread->td_ucred, NULL);
	#else
	zfs_inactive(vp, ap->a_td->td_ucred, NULL);
	#endif
	return (0);
	}

	#if __FreeBSD_version >= 1300042
	#ifndef _SYS_SYSPROTO_H_
	struct vop_need_inactive_args {
	struct vnode *a_vp;
	struct thread *a_td;
	};
	#endif

	static int
	zfs_freebsd_need_inactive(struct vop_need_inactive_args *ap)
	{
	vnode_t *vp = ap->a_vp;
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	int need;

	if (vn_need_pageq_flush(vp))
	return (1);

	if (!ZFS_TEARDOWN_INACTIVE_TRY_ENTER_READ(zfsvfs))
	return (1);
	need = (zp->z_sa_hdl == NULL \|\| zp->z_unlinked \|\| zp->z_atime_dirty);
	ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs);

	return (need);
	}
	#endif

	#ifndef _SYS_SYSPROTO_H_
	struct vop_reclaim_args {
	struct vnode *a_vp;
	struct thread *a_td;
	};
	#endif

	static int
	zfs_freebsd_reclaim(struct vop_reclaim_args *ap)
	{
	vnode_t *vp = ap->a_vp;
	znode_t *zp = VTOZ(vp);
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;

	- ASSERT(zp != NULL);
	+ ASSERT3P(zp, !=, NULL);

	#if __FreeBSD_version < 1300042
	/* Destroy the vm object and flush associated pages. */
	vnode_destroy_vobject(vp);
	#endif
	/*
	* z_teardown_inactive_lock protects from a race with
	* zfs_znode_dmu_fini in zfsvfs_teardown during
	* force unmount.
	*/
	ZFS_TEARDOWN_INACTIVE_ENTER_READ(zfsvfs);
	if (zp->z_sa_hdl == NULL)
	zfs_znode_free(zp);
	else
	zfs_zinactive(zp);
	ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs);

	vp->v_data = NULL;
	return (0);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_fid_args {
	struct vnode *a_vp;
	struct fid *a_fid;
	};
	#endif

	static int
	zfs_freebsd_fid(struct vop_fid_args *ap)
	{

	return (zfs_fid(ap->a_vp, (void *)ap->a_fid, NULL));
	}


	#ifndef _SYS_SYSPROTO_H_
	struct vop_pathconf_args {
	struct vnode *a_vp;
	int a_name;
	register_t *a_retval;
	} *ap;
	#endif

	static int
	zfs_freebsd_pathconf(struct vop_pathconf_args *ap)
	{
	ulong_t val;
	int error;

	error = zfs_pathconf(ap->a_vp, ap->a_name, &val,
	curthread->td_ucred, NULL);
	if (error == 0) {
	*ap->a_retval = val;
	return (error);
	}
	if (error != EOPNOTSUPP)
	return (error);

	switch (ap->a_name) {
	case _PC_NAME_MAX:
	*ap->a_retval = NAME_MAX;
	return (0);
	case _PC_PIPE_BUF:
	if (ap->a_vp->v_type == VDIR \|\| ap->a_vp->v_type == VFIFO) {
	*ap->a_retval = PIPE_BUF;
	return (0);
	}
	return (EINVAL);
	default:
	return (vop_stdpathconf(ap));
	}
	}

	/*
	* FreeBSD's extended attributes namespace defines file name prefix for ZFS'
	* extended attribute name:
	*
	* NAMESPACE PREFIX
	* system freebsd:system:
	* user (none, can be used to access ZFS fsattr(5) attributes
	* created on Solaris)
	*/
	static int
	zfs_create_attrname(int attrnamespace, const char name, char attrname,
	size_t size)
	{
	const char namespace, prefix, *suffix;

	/* We don't allow '/' character in attribute name. */
	if (strchr(name, '/') != NULL)
	return (SET_ERROR(EINVAL));
	/* We don't allow attribute names that start with "freebsd:" string. */
	if (strncmp(name, "freebsd:", 8) == 0)
	return (SET_ERROR(EINVAL));

	bzero(attrname, size);

	switch (attrnamespace) {
	case EXTATTR_NAMESPACE_USER:
	#if 0
	prefix = "freebsd:";
	namespace = EXTATTR_NAMESPACE_USER_STRING;
	suffix = ":";
	#else
	/*
	* This is the default namespace by which we can access all
	* attributes created on Solaris.
	*/
	prefix = namespace = suffix = "";
	#endif
	break;
	case EXTATTR_NAMESPACE_SYSTEM:
	prefix = "freebsd:";
	namespace = EXTATTR_NAMESPACE_SYSTEM_STRING;
	suffix = ":";
	break;
	case EXTATTR_NAMESPACE_EMPTY:
	default:
	return (SET_ERROR(EINVAL));
	}
	if (snprintf(attrname, size, "%s%s%s%s", prefix, namespace, suffix,
	name) >= size) {
	return (SET_ERROR(ENAMETOOLONG));
	}
	return (0);
	}

	+static int
	+zfs_ensure_xattr_cached(znode_t *zp)
	+{
	+ int error = 0;
	+
	+ ASSERT(RW_LOCK_HELD(&zp->z_xattr_lock));
	+
	+ if (zp->z_xattr_cached != NULL)
	+ return (0);
	+
	+ if (rw_write_held(&zp->z_xattr_lock))
	+ return (zfs_sa_get_xattr(zp));
	+
	+ if (!rw_tryupgrade(&zp->z_xattr_lock)) {
	+ rw_exit(&zp->z_xattr_lock);
	+ rw_enter(&zp->z_xattr_lock, RW_WRITER);
	+ }
	+ if (zp->z_xattr_cached == NULL)
	+ error = zfs_sa_get_xattr(zp);
	+ rw_downgrade(&zp->z_xattr_lock);
	+ return (error);
	+}
	+
	#ifndef _SYS_SYSPROTO_H_
	struct vop_getextattr {
	IN struct vnode *a_vp;
	IN int a_attrnamespace;
	IN const char *a_name;
	INOUT struct uio *a_uio;
	OUT size_t *a_size;
	IN struct ucred *a_cred;
	IN struct thread *a_td;
	};
	#endif

	-/*
	- * Vnode operating to retrieve a named extended attribute.
	- */
	static int
	-zfs_getextattr(struct vop_getextattr_args *ap)
	+zfs_getextattr_dir(struct vop_getextattr_args ap, const char attrname)
	{
	- zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs;
	struct thread *td = ap->a_td;
	struct nameidata nd;
	- char attrname[255];
	struct vattr va;
	vnode_t xvp = NULL, vp;
	int error, flags;

	- /*
	- * If the xattr property is off, refuse the request.
	- */
	- if (!(zfsvfs->z_flags & ZSB_XATTR)) {
	- return (SET_ERROR(EOPNOTSUPP));
	- }
	-
	- error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
	- ap->a_cred, ap->a_td, VREAD);
	- if (error != 0)
	- return (error);
	-
	- error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname,
	- sizeof (attrname));
	- if (error != 0)
	- return (error);
	-
	- ZFS_ENTER(zfsvfs);
	-
	error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td,
	LOOKUP_XATTR, B_FALSE);
	- if (error != 0) {
	- ZFS_EXIT(zfsvfs);
	+ if (error != 0)
	return (error);
	- }

	flags = FREAD;
	NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, attrname,
	xvp, td);
	error = vn_open_cred(&nd, &flags, 0, VN_OPEN_INVFS, ap->a_cred, NULL);
	vp = nd.ni_vp;
	NDFREE(&nd, NDF_ONLY_PNBUF);
	- if (error != 0) {
	- ZFS_EXIT(zfsvfs);
	- if (error == ENOENT)
	- error = ENOATTR;
	+ if (error != 0)
	return (error);
	- }

	if (ap->a_size != NULL) {
	error = VOP_GETATTR(vp, &va, ap->a_cred);
	if (error == 0)
	*ap->a_size = (size_t)va.va_size;
	} else if (ap->a_uio != NULL)
	error = VOP_READ(vp, ap->a_uio, IO_UNIT, ap->a_cred);

	VOP_UNLOCK1(vp);
	vn_close(vp, flags, ap->a_cred, td);
	- ZFS_EXIT(zfsvfs);
	return (error);
	}

	-#ifndef _SYS_SYSPROTO_H_
	-struct vop_deleteextattr {
	- IN struct vnode *a_vp;
	- IN int a_attrnamespace;
	- IN const char *a_name;
	- IN struct ucred *a_cred;
	- IN struct thread *a_td;
	-};
	-#endif
	+static int
	+zfs_getextattr_sa(struct vop_getextattr_args ap, const char attrname)
	+{
	+ znode_t *zp = VTOZ(ap->a_vp);
	+ uchar_t *nv_value;
	+ uint_t nv_size;
	+ int error;
	+
	+ error = zfs_ensure_xattr_cached(zp);
	+ if (error != 0)
	+ return (error);
	+
	+ ASSERT(RW_LOCK_HELD(&zp->z_xattr_lock));
	+ ASSERT3P(zp->z_xattr_cached, !=, NULL);
	+
	+ error = nvlist_lookup_byte_array(zp->z_xattr_cached, attrname,
	+ &nv_value, &nv_size);
	+ if (error)
	+ return (error);
	+
	+ if (ap->a_size != NULL)
	+ *ap->a_size = nv_size;
	+ else if (ap->a_uio != NULL)
	+ error = uiomove(nv_value, nv_size, ap->a_uio);
	+
	+ return (error);
	+}

	/*
	- * Vnode operation to remove a named attribute.
	+ * Vnode operation to retrieve a named extended attribute.
	*/
	static int
	-zfs_deleteextattr(struct vop_deleteextattr_args *ap)
	+zfs_getextattr(struct vop_getextattr_args *ap)
	{
	- zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs;
	- struct thread *td = ap->a_td;
	- struct nameidata nd;
	- char attrname[255];
	- vnode_t xvp = NULL, vp;
	+ znode_t *zp = VTOZ(ap->a_vp);
	+ zfsvfs_t *zfsvfs = ZTOZSB(zp);
	+ char attrname[EXTATTR_MAXNAMELEN+1];
	int error;

	/*
	* If the xattr property is off, refuse the request.
	*/
	- if (!(zfsvfs->z_flags & ZSB_XATTR)) {
	+ if (!(zfsvfs->z_flags & ZSB_XATTR))
	return (SET_ERROR(EOPNOTSUPP));
	- }

	error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
	- ap->a_cred, ap->a_td, VWRITE);
	+ ap->a_cred, ap->a_td, VREAD);
	if (error != 0)
	return (error);

	error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname,
	sizeof (attrname));
	if (error != 0)
	return (error);

	+ error = ENOENT;
	ZFS_ENTER(zfsvfs);
	+ ZFS_VERIFY_ZP(zp)
	+ rw_enter(&zp->z_xattr_lock, RW_READER);
	+ if (zfsvfs->z_use_sa && zp->z_is_sa)
	+ error = zfs_getextattr_sa(ap, attrname);
	+ if (error == ENOENT)
	+ error = zfs_getextattr_dir(ap, attrname);
	+ rw_exit(&zp->z_xattr_lock);
	+ ZFS_EXIT(zfsvfs);
	+ if (error == ENOENT)
	+ error = SET_ERROR(ENOATTR);
	+ return (error);
	+}
	+
	+#ifndef _SYS_SYSPROTO_H_
	+struct vop_deleteextattr {
	+ IN struct vnode *a_vp;
	+ IN int a_attrnamespace;
	+ IN const char *a_name;
	+ IN struct ucred *a_cred;
	+ IN struct thread *a_td;
	+};
	+#endif
	+
	+static int
	+zfs_deleteextattr_dir(struct vop_deleteextattr_args ap, const char attrname)
	+{
	+ struct thread *td = ap->a_td;
	+ struct nameidata nd;
	+ vnode_t xvp = NULL, vp;
	+ int error;

	error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td,
	LOOKUP_XATTR, B_FALSE);
	- if (error != 0) {
	- ZFS_EXIT(zfsvfs);
	+ if (error != 0)
	return (error);
	- }

	NDINIT_ATVP(&nd, DELETE, NOFOLLOW \| LOCKPARENT \| LOCKLEAF,
	UIO_SYSSPACE, attrname, xvp, td);
	error = namei(&nd);
	vp = nd.ni_vp;
	if (error != 0) {
	- ZFS_EXIT(zfsvfs);
	NDFREE(&nd, NDF_ONLY_PNBUF);
	- if (error == ENOENT)
	- error = ENOATTR;
	return (error);
	}

	error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
	NDFREE(&nd, NDF_ONLY_PNBUF);

	vput(nd.ni_dvp);
	if (vp == nd.ni_dvp)
	vrele(vp);
	else
	vput(vp);
	- ZFS_EXIT(zfsvfs);

	return (error);
	}

	-#ifndef _SYS_SYSPROTO_H_
	-struct vop_setextattr {
	- IN struct vnode *a_vp;
	- IN int a_attrnamespace;
	- IN const char *a_name;
	- INOUT struct uio *a_uio;
	- IN struct ucred *a_cred;
	- IN struct thread *a_td;
	-};
	-#endif
	+static int
	+zfs_deleteextattr_sa(struct vop_deleteextattr_args ap, const char attrname)
	+{
	+ znode_t *zp = VTOZ(ap->a_vp);
	+ nvlist_t *nvl;
	+ int error;
	+
	+ error = zfs_ensure_xattr_cached(zp);
	+ if (error != 0)
	+ return (error);
	+
	+ ASSERT(RW_WRITE_HELD(&zp->z_xattr_lock));
	+ ASSERT3P(zp->z_xattr_cached, !=, NULL);
	+
	+ nvl = zp->z_xattr_cached;
	+ error = nvlist_remove(nvl, attrname, DATA_TYPE_BYTE_ARRAY);
	+ if (error == 0)
	+ error = zfs_sa_set_xattr(zp);
	+ if (error != 0) {
	+ zp->z_xattr_cached = NULL;
	+ nvlist_free(nvl);
	+ }
	+ return (error);
	+}

	/*
	- * Vnode operation to set a named attribute.
	+ * Vnode operation to remove a named attribute.
	*/
	static int
	-zfs_setextattr(struct vop_setextattr_args *ap)
	+zfs_deleteextattr(struct vop_deleteextattr_args *ap)
	{
	- zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs;
	- struct thread *td = ap->a_td;
	- struct nameidata nd;
	- char attrname[255];
	- struct vattr va;
	- vnode_t xvp = NULL, vp;
	- int error, flags;
	+ znode_t *zp = VTOZ(ap->a_vp);
	+ zfsvfs_t *zfsvfs = ZTOZSB(zp);
	+ char attrname[EXTATTR_MAXNAMELEN+1];
	+ int error;

	/*
	* If the xattr property is off, refuse the request.
	*/
	- if (!(zfsvfs->z_flags & ZSB_XATTR)) {
	+ if (!(zfsvfs->z_flags & ZSB_XATTR))
	return (SET_ERROR(EOPNOTSUPP));
	- }

	error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
	ap->a_cred, ap->a_td, VWRITE);
	if (error != 0)
	return (error);
	+
	error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname,
	sizeof (attrname));
	if (error != 0)
	return (error);

	+ size_t size = 0;
	+ struct vop_getextattr_args vga = {
	+ .a_vp = ap->a_vp,
	+ .a_size = &size,
	+ .a_cred = ap->a_cred,
	+ .a_td = ap->a_td,
	+ };
	+ error = ENOENT;
	ZFS_ENTER(zfsvfs);
	+ ZFS_VERIFY_ZP(zp);
	+ rw_enter(&zp->z_xattr_lock, RW_WRITER);
	+ if (zfsvfs->z_use_sa && zp->z_is_sa) {
	+ error = zfs_getextattr_sa(&vga, attrname);
	+ if (error == 0)
	+ error = zfs_deleteextattr_sa(ap, attrname);
	+ }
	+ if (error == ENOENT) {
	+ error = zfs_getextattr_dir(&vga, attrname);
	+ if (error == 0)
	+ error = zfs_deleteextattr_dir(ap, attrname);
	+ }
	+ rw_exit(&zp->z_xattr_lock);
	+ ZFS_EXIT(zfsvfs);
	+ if (error == ENOENT)
	+ error = SET_ERROR(ENOATTR);
	+ return (error);
	+}
	+
	+#ifndef _SYS_SYSPROTO_H_
	+struct vop_setextattr {
	+ IN struct vnode *a_vp;
	+ IN int a_attrnamespace;
	+ IN const char *a_name;
	+ INOUT struct uio *a_uio;
	+ IN struct ucred *a_cred;
	+ IN struct thread *a_td;
	+};
	+#endif
	+
	+static int
	+zfs_setextattr_dir(struct vop_setextattr_args ap, const char attrname)
	+{
	+ struct thread *td = ap->a_td;
	+ struct nameidata nd;
	+ struct vattr va;
	+ vnode_t xvp = NULL, vp;
	+ int error, flags;

	error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td,
	LOOKUP_XATTR \| CREATE_XATTR_DIR, B_FALSE);
	- if (error != 0) {
	- ZFS_EXIT(zfsvfs);
	+ if (error != 0)
	return (error);
	- }

	flags = FFLAGS(O_WRONLY \| O_CREAT);
	- NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, attrname,
	- xvp, td);
	+ NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, attrname, xvp, td);
	error = vn_open_cred(&nd, &flags, 0600, VN_OPEN_INVFS, ap->a_cred,
	NULL);
	vp = nd.ni_vp;
	NDFREE(&nd, NDF_ONLY_PNBUF);
	- if (error != 0) {
	- ZFS_EXIT(zfsvfs);
	+ if (error != 0)
	return (error);
	- }

	VATTR_NULL(&va);
	va.va_size = 0;
	error = VOP_SETATTR(vp, &va, ap->a_cred);
	if (error == 0)
	VOP_WRITE(vp, ap->a_uio, IO_UNIT, ap->a_cred);

	VOP_UNLOCK1(vp);
	vn_close(vp, flags, ap->a_cred, td);
	- ZFS_EXIT(zfsvfs);
	return (error);
	}

	-#ifndef _SYS_SYSPROTO_H_
	-struct vop_listextattr {
	- IN struct vnode *a_vp;
	- IN int a_attrnamespace;
	- INOUT struct uio *a_uio;
	- OUT size_t *a_size;
	- IN struct ucred *a_cred;
	- IN struct thread *a_td;
	-};
	-#endif
	+static int
	+zfs_setextattr_sa(struct vop_setextattr_args ap, const char attrname)
	+{
	+ znode_t *zp = VTOZ(ap->a_vp);
	+ nvlist_t *nvl;
	+ size_t sa_size;
	+ int error;
	+
	+ error = zfs_ensure_xattr_cached(zp);
	+ if (error != 0)
	+ return (error);
	+
	+ ASSERT(RW_WRITE_HELD(&zp->z_xattr_lock));
	+ ASSERT3P(zp->z_xattr_cached, !=, NULL);
	+
	+ nvl = zp->z_xattr_cached;
	+ size_t entry_size = ap->a_uio->uio_resid;
	+ if (entry_size > DXATTR_MAX_ENTRY_SIZE)
	+ return (SET_ERROR(EFBIG));
	+ error = nvlist_size(nvl, &sa_size, NV_ENCODE_XDR);
	+ if (error != 0)
	+ return (error);
	+ if (sa_size > DXATTR_MAX_SA_SIZE)
	+ return (SET_ERROR(EFBIG));
	+ uchar_t *buf = kmem_alloc(entry_size, KM_SLEEP);
	+ error = uiomove(buf, entry_size, ap->a_uio);
	+ if (error == 0)
	+ error = nvlist_add_byte_array(nvl, attrname, buf, entry_size);
	+ kmem_free(buf, entry_size);
	+ if (error == 0)
	+ error = zfs_sa_set_xattr(zp);
	+ if (error != 0) {
	+ zp->z_xattr_cached = NULL;
	+ nvlist_free(nvl);
	+ }
	+ return (error);
	+}

	/*
	- * Vnode operation to retrieve extended attributes on a vnode.
	+ * Vnode operation to set a named attribute.
	*/
	static int
	-zfs_listextattr(struct vop_listextattr_args *ap)
	+zfs_setextattr(struct vop_setextattr_args *ap)
	{
	- zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs;
	- struct thread *td = ap->a_td;
	- struct nameidata nd;
	- char attrprefix[16];
	- uint8_t dirbuf[sizeof (struct dirent)];
	- struct dirent *dp;
	- struct iovec aiov;
	- struct uio auio;
	- size_t *sizep = ap->a_size;
	- size_t plen;
	- vnode_t xvp = NULL, vp;
	- int done, error, eof, pos;
	- zfs_uio_t uio;
	-
	- zfs_uio_init(&uio, ap->a_uio);
	+ znode_t *zp = VTOZ(ap->a_vp);
	+ zfsvfs_t *zfsvfs = ZTOZSB(zp);
	+ char attrname[EXTATTR_MAXNAMELEN+1];
	+ int error;

	/*
	* If the xattr property is off, refuse the request.
	*/
	- if (!(zfsvfs->z_flags & ZSB_XATTR)) {
	+ if (!(zfsvfs->z_flags & ZSB_XATTR))
	return (SET_ERROR(EOPNOTSUPP));
	- }

	error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
	- ap->a_cred, ap->a_td, VREAD);
	+ ap->a_cred, ap->a_td, VWRITE);
	if (error != 0)
	return (error);

	- error = zfs_create_attrname(ap->a_attrnamespace, "", attrprefix,
	- sizeof (attrprefix));
	+ error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname,
	+ sizeof (attrname));
	if (error != 0)
	return (error);
	- plen = strlen(attrprefix);

	+ struct vop_deleteextattr_args vda = {
	+ .a_vp = ap->a_vp,
	+ .a_cred = ap->a_cred,
	+ .a_td = ap->a_td,
	+ };
	+ error = ENOENT;
	ZFS_ENTER(zfsvfs);
	+ ZFS_VERIFY_ZP(zp);
	+ rw_enter(&zp->z_xattr_lock, RW_WRITER);
	+ if (zfsvfs->z_use_sa && zp->z_is_sa && zfsvfs->z_xattr_sa) {
	+ error = zfs_setextattr_sa(ap, attrname);
	+ if (error == 0)
	+ /*
	+ * Successfully put into SA, we need to clear the one
	+ * in dir if present.
	+ */
	+ zfs_deleteextattr_dir(&vda, attrname);
	+ }
	+ if (error) {
	+ error = zfs_setextattr_dir(ap, attrname);
	+ if (error == 0 && zp->z_is_sa)
	+ /*
	+ * Successfully put into dir, we need to clear the one
	+ * in SA if present.
	+ */
	+ zfs_deleteextattr_sa(&vda, attrname);
	+ }
	+ rw_exit(&zp->z_xattr_lock);
	+ ZFS_EXIT(zfsvfs);
	+ return (error);
	+}

	- if (sizep != NULL)
	- *sizep = 0;
	+#ifndef _SYS_SYSPROTO_H_
	+struct vop_listextattr {
	+ IN struct vnode *a_vp;
	+ IN int a_attrnamespace;
	+ INOUT struct uio *a_uio;
	+ OUT size_t *a_size;
	+ IN struct ucred *a_cred;
	+ IN struct thread *a_td;
	+};
	+#endif
	+
	+static int
	+zfs_listextattr_dir(struct vop_listextattr_args ap, const char attrprefix)
	+{
	+ struct thread *td = ap->a_td;
	+ struct nameidata nd;
	+ uint8_t dirbuf[sizeof (struct dirent)];
	+ struct iovec aiov;
	+ struct uio auio;
	+ vnode_t xvp = NULL, vp;
	+ int error, eof;

	error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td,
	LOOKUP_XATTR, B_FALSE);
	if (error != 0) {
	- ZFS_EXIT(zfsvfs);
	/*
	* ENOATTR means that the EA directory does not yet exist,
	* i.e. there are no extended attributes there.
	*/
	if (error == ENOATTR)
	error = 0;
	return (error);
	}

	NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW \| LOCKLEAF \| LOCKSHARED,
	UIO_SYSSPACE, ".", xvp, td);
	error = namei(&nd);
	vp = nd.ni_vp;
	NDFREE(&nd, NDF_ONLY_PNBUF);
	- if (error != 0) {
	- ZFS_EXIT(zfsvfs);
	+ if (error != 0)
	return (error);
	- }

	auio.uio_iov = &aiov;
	auio.uio_iovcnt = 1;
	auio.uio_segflg = UIO_SYSSPACE;
	auio.uio_td = td;
	auio.uio_rw = UIO_READ;
	auio.uio_offset = 0;

	- do {
	- uint8_t nlen;
	+ size_t plen = strlen(attrprefix);

	+ do {
	aiov.iov_base = (void *)dirbuf;
	aiov.iov_len = sizeof (dirbuf);
	auio.uio_resid = sizeof (dirbuf);
	error = VOP_READDIR(vp, &auio, ap->a_cred, &eof, NULL, NULL);
	- done = sizeof (dirbuf) - auio.uio_resid;
	if (error != 0)
	break;
	- for (pos = 0; pos < done; ) {
	- dp = (struct dirent *)(dirbuf + pos);
	+ int done = sizeof (dirbuf) - auio.uio_resid;
	+ for (int pos = 0; pos < done; ) {
	+ struct dirent dp = (struct dirent )(dirbuf + pos);
	pos += dp->d_reclen;
	/*
	* XXX: Temporarily we also accept DT_UNKNOWN, as this
	* is what we get when attribute was created on Solaris.
	*/
	if (dp->d_type != DT_REG && dp->d_type != DT_UNKNOWN)
	continue;
	- if (plen == 0 &&
	+ else if (plen == 0 &&
	strncmp(dp->d_name, "freebsd:", 8) == 0)
	continue;
	else if (strncmp(dp->d_name, attrprefix, plen) != 0)
	continue;
	- nlen = dp->d_namlen - plen;
	- if (sizep != NULL)
	- *sizep += 1 + nlen;
	- else if (GET_UIO_STRUCT(&uio) != NULL) {
	+ uint8_t nlen = dp->d_namlen - plen;
	+ if (ap->a_size != NULL) {
	+ *ap->a_size += 1 + nlen;
	+ } else if (ap->a_uio != NULL) {
	/*
	* Format of extattr name entry is one byte for
	* length and the rest for name.
	*/
	- error = zfs_uiomove(&nlen, 1, zfs_uio_rw(&uio),
	- &uio);
	+ error = uiomove(&nlen, 1, ap->a_uio);
	if (error == 0) {
	- error = zfs_uiomove(dp->d_name + plen,
	- nlen, zfs_uio_rw(&uio), &uio);
	+ char *namep = dp->d_name + plen;
	+ error = uiomove(namep, nlen, ap->a_uio);
	}
	if (error != 0)
	break;
	}
	}
	} while (!eof && error == 0);

	vput(vp);
	- ZFS_EXIT(zfsvfs);
	+ return (error);
	+}
	+
	+static int
	+zfs_listextattr_sa(struct vop_listextattr_args ap, const char attrprefix)
	+{
	+ znode_t *zp = VTOZ(ap->a_vp);
	+ int error;
	+
	+ error = zfs_ensure_xattr_cached(zp);
	+ if (error != 0)
	+ return (error);
	+
	+ ASSERT(RW_LOCK_HELD(&zp->z_xattr_lock));
	+ ASSERT3P(zp->z_xattr_cached, !=, NULL);
	+
	+ size_t plen = strlen(attrprefix);
	+ nvpair_t *nvp = NULL;
	+ while ((nvp = nvlist_next_nvpair(zp->z_xattr_cached, nvp)) != NULL) {
	+ ASSERT3U(nvpair_type(nvp), ==, DATA_TYPE_BYTE_ARRAY);
	+
	+ const char *name = nvpair_name(nvp);
	+ if (plen == 0 && strncmp(name, "freebsd:", 8) == 0)
	+ continue;
	+ else if (strncmp(name, attrprefix, plen) != 0)
	+ continue;
	+ uint8_t nlen = strlen(name) - plen;
	+ if (ap->a_size != NULL) {
	+ *ap->a_size += 1 + nlen;
	+ } else if (ap->a_uio != NULL) {
	+ /*
	+ * Format of extattr name entry is one byte for
	+ * length and the rest for name.
	+ */
	+ error = uiomove(&nlen, 1, ap->a_uio);
	+ if (error == 0) {
	+ char namep = __DECONST(char , name) + plen;
	+ error = uiomove(namep, nlen, ap->a_uio);
	+ }
	+ if (error != 0)
	+ break;
	+ }
	+ }
	+
	+ return (error);
	+}
	+
	+/*
	+ * Vnode operation to retrieve extended attributes on a vnode.
	+ */
	+static int
	+zfs_listextattr(struct vop_listextattr_args *ap)
	+{
	+ znode_t *zp = VTOZ(ap->a_vp);
	+ zfsvfs_t *zfsvfs = ZTOZSB(zp);
	+ char attrprefix[16];
	+ int error;
	+
	+ if (ap->a_size != NULL)
	+ *ap->a_size = 0;

	+ /*
	+ * If the xattr property is off, refuse the request.
	+ */
	+ if (!(zfsvfs->z_flags & ZSB_XATTR))
	+ return (SET_ERROR(EOPNOTSUPP));
	+
	+ error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
	+ ap->a_cred, ap->a_td, VREAD);
	+ if (error != 0)
	+ return (error);
	+
	+ error = zfs_create_attrname(ap->a_attrnamespace, "", attrprefix,
	+ sizeof (attrprefix));
	+ if (error != 0)
	+ return (error);
	+
	+ ZFS_ENTER(zfsvfs);
	+ ZFS_VERIFY_ZP(zp);
	+ rw_enter(&zp->z_xattr_lock, RW_READER);
	+ if (zfsvfs->z_use_sa && zp->z_is_sa)
	+ error = zfs_listextattr_sa(ap, attrprefix);
	+ if (error == 0)
	+ error = zfs_listextattr_dir(ap, attrprefix);
	+ rw_exit(&zp->z_xattr_lock);
	+ ZFS_EXIT(zfsvfs);
	return (error);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_getacl_args {
	struct vnode *vp;
	acl_type_t type;
	struct acl *aclp;
	struct ucred *cred;
	struct thread *td;
	};
	#endif

	static int
	zfs_freebsd_getacl(struct vop_getacl_args *ap)
	{
	int error;
	vsecattr_t vsecattr;

	if (ap->a_type != ACL_TYPE_NFS4)
	return (EINVAL);

	vsecattr.vsa_mask = VSA_ACE \| VSA_ACECNT;
	if ((error = zfs_getsecattr(VTOZ(ap->a_vp),
	&vsecattr, 0, ap->a_cred)))
	return (error);

	error = acl_from_aces(ap->a_aclp, vsecattr.vsa_aclentp,
	vsecattr.vsa_aclcnt);
	if (vsecattr.vsa_aclentp != NULL)
	kmem_free(vsecattr.vsa_aclentp, vsecattr.vsa_aclentsz);

	return (error);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_setacl_args {
	struct vnode *vp;
	acl_type_t type;
	struct acl *aclp;
	struct ucred *cred;
	struct thread *td;
	};
	#endif

	static int
	zfs_freebsd_setacl(struct vop_setacl_args *ap)
	{
	int error;
	vsecattr_t vsecattr;
	int aclbsize; /* size of acl list in bytes */
	aclent_t *aaclp;

	if (ap->a_type != ACL_TYPE_NFS4)
	return (EINVAL);

	if (ap->a_aclp == NULL)
	return (EINVAL);

	if (ap->a_aclp->acl_cnt < 1 \|\| ap->a_aclp->acl_cnt > MAX_ACL_ENTRIES)
	return (EINVAL);

	/*
	* With NFSv4 ACLs, chmod(2) may need to add additional entries,
	* splitting every entry into two and appending "canonical six"
	* entries at the end. Don't allow for setting an ACL that would
	* cause chmod(2) to run out of ACL entries.
	*/
	if (ap->a_aclp->acl_cnt * 2 + 6 > ACL_MAX_ENTRIES)
	return (ENOSPC);

	error = acl_nfs4_check(ap->a_aclp, ap->a_vp->v_type == VDIR);
	if (error != 0)
	return (error);

	vsecattr.vsa_mask = VSA_ACE;
	aclbsize = ap->a_aclp->acl_cnt * sizeof (ace_t);
	vsecattr.vsa_aclentp = kmem_alloc(aclbsize, KM_SLEEP);
	aaclp = vsecattr.vsa_aclentp;
	vsecattr.vsa_aclentsz = aclbsize;

	aces_from_acl(vsecattr.vsa_aclentp, &vsecattr.vsa_aclcnt, ap->a_aclp);
	error = zfs_setsecattr(VTOZ(ap->a_vp), &vsecattr, 0, ap->a_cred);
	kmem_free(aaclp, aclbsize);

	return (error);
	}

	#ifndef _SYS_SYSPROTO_H_
	struct vop_aclcheck_args {
	struct vnode *vp;
	acl_type_t type;
	struct acl *aclp;
	struct ucred *cred;
	struct thread *td;
	};
	#endif

	static int
	zfs_freebsd_aclcheck(struct vop_aclcheck_args *ap)
	{

	return (EOPNOTSUPP);
	}

	static int
	zfs_vptocnp(struct vop_vptocnp_args *ap)
	{
	vnode_t *covered_vp;
	vnode_t *vp = ap->a_vp;
	zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
	znode_t *zp = VTOZ(vp);
	int ltype;
	int error;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	/*
	* If we are a snapshot mounted under .zfs, run the operation
	* on the covered vnode.
	*/
	if (zp->z_id != zfsvfs->z_root \|\| zfsvfs->z_parent == zfsvfs) {
	char name[MAXNAMLEN + 1];
	znode_t *dzp;
	size_t len;

	error = zfs_znode_parent_and_name(zp, &dzp, name);
	if (error == 0) {
	len = strlen(name);
	if (*ap->a_buflen < len)
	error = SET_ERROR(ENOMEM);
	}
	if (error == 0) {
	*ap->a_buflen -= len;
	bcopy(name, ap->a_buf + *ap->a_buflen, len);
	*ap->a_vpp = ZTOV(dzp);
	}
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	ZFS_EXIT(zfsvfs);

	covered_vp = vp->v_mount->mnt_vnodecovered;
	#if __FreeBSD_version >= 1300045
	enum vgetstate vs = vget_prep(covered_vp);
	#else
	vhold(covered_vp);
	#endif
	ltype = VOP_ISLOCKED(vp);
	VOP_UNLOCK1(vp);
	#if __FreeBSD_version >= 1300045
	error = vget_finish(covered_vp, LK_SHARED, vs);
	#else
	error = vget(covered_vp, LK_SHARED \| LK_VNHELD, curthread);
	#endif
	if (error == 0) {
	#if __FreeBSD_version >= 1300123
	error = VOP_VPTOCNP(covered_vp, ap->a_vpp, ap->a_buf,
	ap->a_buflen);
	#else
	error = VOP_VPTOCNP(covered_vp, ap->a_vpp, ap->a_cred,
	ap->a_buf, ap->a_buflen);
	#endif
	vput(covered_vp);
	}
	vn_lock(vp, ltype \| LK_RETRY);
	if (VN_IS_DOOMED(vp))
	error = SET_ERROR(ENOENT);
	return (error);
	}

	struct vop_vector zfs_vnodeops;
	struct vop_vector zfs_fifoops;
	struct vop_vector zfs_shareops;

	struct vop_vector zfs_vnodeops = {
	.vop_default = &default_vnodeops,
	.vop_inactive = zfs_freebsd_inactive,
	#if __FreeBSD_version >= 1300042
	.vop_need_inactive = zfs_freebsd_need_inactive,
	#endif
	.vop_reclaim = zfs_freebsd_reclaim,
	#if __FreeBSD_version >= 1300102
	.vop_fplookup_vexec = zfs_freebsd_fplookup_vexec,
	#endif
	#if __FreeBSD_version >= 1300139
	.vop_fplookup_symlink = zfs_freebsd_fplookup_symlink,
	#endif
	.vop_access = zfs_freebsd_access,
	.vop_allocate = VOP_EINVAL,
	.vop_lookup = zfs_cache_lookup,
	.vop_cachedlookup = zfs_freebsd_cachedlookup,
	.vop_getattr = zfs_freebsd_getattr,
	.vop_setattr = zfs_freebsd_setattr,
	.vop_create = zfs_freebsd_create,
	.vop_mknod = (vop_mknod_t *)zfs_freebsd_create,
	.vop_mkdir = zfs_freebsd_mkdir,
	.vop_readdir = zfs_freebsd_readdir,
	.vop_fsync = zfs_freebsd_fsync,
	.vop_open = zfs_freebsd_open,
	.vop_close = zfs_freebsd_close,
	.vop_rmdir = zfs_freebsd_rmdir,
	.vop_ioctl = zfs_freebsd_ioctl,
	.vop_link = zfs_freebsd_link,
	.vop_symlink = zfs_freebsd_symlink,
	.vop_readlink = zfs_freebsd_readlink,
	.vop_read = zfs_freebsd_read,
	.vop_write = zfs_freebsd_write,
	.vop_remove = zfs_freebsd_remove,
	.vop_rename = zfs_freebsd_rename,
	.vop_pathconf = zfs_freebsd_pathconf,
	.vop_bmap = zfs_freebsd_bmap,
	.vop_fid = zfs_freebsd_fid,
	.vop_getextattr = zfs_getextattr,
	.vop_deleteextattr = zfs_deleteextattr,
	.vop_setextattr = zfs_setextattr,
	.vop_listextattr = zfs_listextattr,
	.vop_getacl = zfs_freebsd_getacl,
	.vop_setacl = zfs_freebsd_setacl,
	.vop_aclcheck = zfs_freebsd_aclcheck,
	.vop_getpages = zfs_freebsd_getpages,
	.vop_putpages = zfs_freebsd_putpages,
	.vop_vptocnp = zfs_vptocnp,
	#if __FreeBSD_version >= 1300064
	.vop_lock1 = vop_lock,
	.vop_unlock = vop_unlock,
	.vop_islocked = vop_islocked,
	#endif
	};
	VFS_VOP_VECTOR_REGISTER(zfs_vnodeops);

	struct vop_vector zfs_fifoops = {
	.vop_default = &fifo_specops,
	.vop_fsync = zfs_freebsd_fsync,
	#if __FreeBSD_version >= 1300102
	.vop_fplookup_vexec = zfs_freebsd_fplookup_vexec,
	#endif
	#if __FreeBSD_version >= 1300139
	.vop_fplookup_symlink = zfs_freebsd_fplookup_symlink,
	#endif
	.vop_access = zfs_freebsd_access,
	.vop_getattr = zfs_freebsd_getattr,
	.vop_inactive = zfs_freebsd_inactive,
	.vop_read = VOP_PANIC,
	.vop_reclaim = zfs_freebsd_reclaim,
	.vop_setattr = zfs_freebsd_setattr,
	.vop_write = VOP_PANIC,
	.vop_pathconf = zfs_freebsd_pathconf,
	.vop_fid = zfs_freebsd_fid,
	.vop_getacl = zfs_freebsd_getacl,
	.vop_setacl = zfs_freebsd_setacl,
	.vop_aclcheck = zfs_freebsd_aclcheck,
	};
	VFS_VOP_VECTOR_REGISTER(zfs_fifoops);

	/*
	* special share hidden files vnode operations template
	*/
	struct vop_vector zfs_shareops = {
	.vop_default = &default_vnodeops,
	#if __FreeBSD_version >= 1300121
	.vop_fplookup_vexec = VOP_EAGAIN,
	#endif
	#if __FreeBSD_version >= 1300139
	.vop_fplookup_symlink = VOP_EAGAIN,
	#endif
	.vop_access = zfs_freebsd_access,
	.vop_inactive = zfs_freebsd_inactive,
	.vop_reclaim = zfs_freebsd_reclaim,
	.vop_fid = zfs_freebsd_fid,
	.vop_pathconf = zfs_freebsd_pathconf,
	};
	VFS_VOP_VECTOR_REGISTER(zfs_shareops);
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_znode.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_znode.c
	index dace3ec345fa..7b6f77e2c669 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_znode.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_znode.c
	@@ -1,2082 +1,2102 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	*/

	/* Portions Copyright 2007 Jeremy Teo */
	/* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */

	#ifdef _KERNEL
	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/systm.h>
	#include <sys/sysmacros.h>
	#include <sys/resource.h>
	#include <sys/mntent.h>
	#include <sys/u8_textprep.h>
	#include <sys/dsl_dataset.h>
	#include <sys/vfs.h>
	#include <sys/vnode.h>
	#include <sys/file.h>
	#include <sys/kmem.h>
	#include <sys/errno.h>
	#include <sys/unistd.h>
	#include <sys/atomic.h>
	#include <sys/zfs_dir.h>
	#include <sys/zfs_acl.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zfs_rlock.h>
	#include <sys/zfs_fuid.h>
	#include <sys/dnode.h>
	#include <sys/fs/zfs.h>
	#endif /* _KERNEL */

	#include <sys/dmu.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_tx.h>
	#include <sys/zfs_refcount.h>
	#include <sys/stat.h>
	#include <sys/zap.h>
	#include <sys/zfs_znode.h>
	#include <sys/sa.h>
	#include <sys/zfs_sa.h>
	#include <sys/zfs_stat.h>

	#include "zfs_prop.h"
	#include "zfs_comutil.h"

	/* Used by fstat(1). */
	SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD,
	SYSCTL_NULL_INT_PTR, sizeof (znode_t), "sizeof(znode_t)");

	/*
	* Define ZNODE_STATS to turn on statistic gathering. By default, it is only
	* turned on when DEBUG is also defined.
	*/
	#ifdef ZFS_DEBUG
	#define ZNODE_STATS
	#endif /* DEBUG */

	#ifdef ZNODE_STATS
	#define ZNODE_STAT_ADD(stat) ((stat)++)
	#else
	#define ZNODE_STAT_ADD(stat) /* nothing */
	#endif /* ZNODE_STATS */

	/*
	* Functions needed for userland (ie: libzpool) are not put under
	* #ifdef_KERNEL; the rest of the functions have dependencies
	* (such as VFS logic) that will not compile easily in userland.
	*/
	#ifdef _KERNEL
	#if !defined(KMEM_DEBUG) && __FreeBSD_version >= 1300102
	#define _ZFS_USE_SMR
	static uma_zone_t znode_uma_zone;
	#else
	static kmem_cache_t *znode_cache = NULL;
	#endif

	extern struct vop_vector zfs_vnodeops;
	extern struct vop_vector zfs_fifoops;
	extern struct vop_vector zfs_shareops;


	/*
	* This callback is invoked when acquiring a RL_WRITER or RL_APPEND lock on
	* z_rangelock. It will modify the offset and length of the lock to reflect
	* znode-specific information, and convert RL_APPEND to RL_WRITER. This is
	* called with the rangelock_t's rl_lock held, which avoids races.
	*/
	static void
	zfs_rangelock_cb(zfs_locked_range_t new, void arg)
	{
	znode_t *zp = arg;

	/*
	* If in append mode, convert to writer and lock starting at the
	* current end of file.
	*/
	if (new->lr_type == RL_APPEND) {
	new->lr_offset = zp->z_size;
	new->lr_type = RL_WRITER;
	}

	/*
	* If we need to grow the block size then lock the whole file range.
	*/
	uint64_t end_size = MAX(zp->z_size, new->lr_offset + new->lr_length);
	if (end_size > zp->z_blksz && (!ISP2(zp->z_blksz) \|\|
	zp->z_blksz < ZTOZSB(zp)->z_max_blksz)) {
	new->lr_offset = 0;
	new->lr_length = UINT64_MAX;
	}
	}

	static int
	zfs_znode_cache_constructor(void buf, void arg, int kmflags)
	{
	znode_t *zp = buf;

	POINTER_INVALIDATE(&zp->z_zfsvfs);

	list_link_init(&zp->z_link_node);

	mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
	+ rw_init(&zp->z_xattr_lock, NULL, RW_DEFAULT, NULL);

	zfs_rangelock_init(&zp->z_rangelock, zfs_rangelock_cb, zp);

	zp->z_acl_cached = NULL;
	+ zp->z_xattr_cached = NULL;
	+ zp->z_xattr_parent = 0;
	zp->z_vnode = NULL;
	return (0);
	}

	/ARGSUSED/
	static void
	zfs_znode_cache_destructor(void buf, void arg)
	{
	znode_t *zp = buf;

	ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
	ASSERT3P(zp->z_vnode, ==, NULL);
	ASSERT(!list_link_active(&zp->z_link_node));
	mutex_destroy(&zp->z_lock);
	mutex_destroy(&zp->z_acl_lock);
	+ rw_destroy(&zp->z_xattr_lock);
	zfs_rangelock_fini(&zp->z_rangelock);

	- ASSERT(zp->z_acl_cached == NULL);
	+ ASSERT3P(zp->z_acl_cached, ==, NULL);
	+ ASSERT3P(zp->z_xattr_cached, ==, NULL);
	}


	#ifdef _ZFS_USE_SMR
	VFS_SMR_DECLARE;

	static int
	zfs_znode_cache_constructor_smr(void mem, int size __unused, void private,
	int flags)
	{

	return (zfs_znode_cache_constructor(mem, private, flags));
	}

	static void
	zfs_znode_cache_destructor_smr(void mem, int size __unused, void private)
	{

	zfs_znode_cache_destructor(mem, private);
	}

	void
	zfs_znode_init(void)
	{
	/*
	* Initialize zcache
	*/
	- ASSERT(znode_uma_zone == NULL);
	+ ASSERT3P(znode_uma_zone, ==, NULL);
	znode_uma_zone = uma_zcreate("zfs_znode_cache",
	sizeof (znode_t), zfs_znode_cache_constructor_smr,
	zfs_znode_cache_destructor_smr, NULL, NULL, 0, 0);
	VFS_SMR_ZONE_SET(znode_uma_zone);
	}

	static znode_t *
	zfs_znode_alloc_kmem(int flags)
	{

	return (uma_zalloc_smr(znode_uma_zone, flags));
	}

	static void
	zfs_znode_free_kmem(znode_t *zp)
	{
	-
	+ if (zp->z_xattr_cached) {
	+ nvlist_free(zp->z_xattr_cached);
	+ zp->z_xattr_cached = NULL;
	+ }
	uma_zfree_smr(znode_uma_zone, zp);
	}
	#else
	void
	zfs_znode_init(void)
	{
	/*
	* Initialize zcache
	*/
	- ASSERT(znode_cache == NULL);
	+ ASSERT3P(znode_cache, ==, NULL);
	znode_cache = kmem_cache_create("zfs_znode_cache",
	sizeof (znode_t), 0, zfs_znode_cache_constructor,
	zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
	}

	static znode_t *
	zfs_znode_alloc_kmem(int flags)
	{

	return (kmem_cache_alloc(znode_cache, flags));
	}

	static void
	zfs_znode_free_kmem(znode_t *zp)
	{
	-
	+ if (zp->z_xattr_cached) {
	+ nvlist_free(zp->z_xattr_cached);
	+ zp->z_xattr_cached = NULL;
	+ }
	kmem_cache_free(znode_cache, zp);
	}
	#endif

	void
	zfs_znode_fini(void)
	{
	/*
	* Cleanup zcache
	*/
	#ifdef _ZFS_USE_SMR
	if (znode_uma_zone) {
	uma_zdestroy(znode_uma_zone);
	znode_uma_zone = NULL;
	}
	#else
	if (znode_cache) {
	kmem_cache_destroy(znode_cache);
	znode_cache = NULL;
	}
	#endif
	}


	static int
	zfs_create_share_dir(zfsvfs_t zfsvfs, dmu_tx_t tx)
	{
	zfs_acl_ids_t acl_ids;
	vattr_t vattr;
	znode_t *sharezp;
	znode_t *zp;
	int error;

	vattr.va_mask = AT_MODE\|AT_UID\|AT_GID;
	vattr.va_type = VDIR;
	vattr.va_mode = S_IFDIR\|0555;
	vattr.va_uid = crgetuid(kcred);
	vattr.va_gid = crgetgid(kcred);

	sharezp = zfs_znode_alloc_kmem(KM_SLEEP);
	ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs));
	sharezp->z_unlinked = 0;
	sharezp->z_atime_dirty = 0;
	sharezp->z_zfsvfs = zfsvfs;
	sharezp->z_is_sa = zfsvfs->z_use_sa;

	- VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
	+ VERIFY0(zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
	kcred, NULL, &acl_ids));
	zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids);
	ASSERT3P(zp, ==, sharezp);
	POINTER_INVALIDATE(&sharezp->z_zfsvfs);
	error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
	ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx);
	zfsvfs->z_shares_dir = sharezp->z_id;

	zfs_acl_ids_free(&acl_ids);
	sa_handle_destroy(sharezp->z_sa_hdl);
	zfs_znode_free_kmem(sharezp);

	return (error);
	}

	/*
	* define a couple of values we need available
	* for both 64 and 32 bit environments.
	*/
	#ifndef NBITSMINOR64
	#define NBITSMINOR64 32
	#endif
	#ifndef MAXMAJ64
	#define MAXMAJ64 0xffffffffUL
	#endif
	#ifndef MAXMIN64
	#define MAXMIN64 0xffffffffUL
	#endif

	/*
	* Create special expldev for ZFS private use.
	* Can't use standard expldev since it doesn't do
	* what we want. The standard expldev() takes a
	* dev32_t in LP64 and expands it to a long dev_t.
	* We need an interface that takes a dev32_t in ILP32
	* and expands it to a long dev_t.
	*/
	static uint64_t
	zfs_expldev(dev_t dev)
	{
	return (((uint64_t)major(dev) << NBITSMINOR64) \| minor(dev));
	}
	/*
	* Special cmpldev for ZFS private use.
	* Can't use standard cmpldev since it takes
	* a long dev_t and compresses it to dev32_t in
	* LP64. We need to do a compaction of a long dev_t
	* to a dev32_t in ILP32.
	*/
	dev_t
	zfs_cmpldev(uint64_t dev)
	{
	return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64)));
	}

	static void
	zfs_znode_sa_init(zfsvfs_t zfsvfs, znode_t zp,
	dmu_buf_t db, dmu_object_type_t obj_type, sa_handle_t sa_hdl)
	{
	ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) \|\| (zfsvfs == zp->z_zfsvfs));
	ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id)));

	- ASSERT(zp->z_sa_hdl == NULL);
	- ASSERT(zp->z_acl_cached == NULL);
	+ ASSERT3P(zp->z_sa_hdl, ==, NULL);
	+ ASSERT3P(zp->z_acl_cached, ==, NULL);
	if (sa_hdl == NULL) {
	- VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp,
	+ VERIFY0(sa_handle_get_from_db(zfsvfs->z_os, db, zp,
	SA_HDL_SHARED, &zp->z_sa_hdl));
	} else {
	zp->z_sa_hdl = sa_hdl;
	sa_set_userp(sa_hdl, zp);
	}

	zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;

	/*
	* Slap on VROOT if we are the root znode unless we are the root
	* node of a snapshot mounted under .zfs.
	*/
	if (zp->z_id == zfsvfs->z_root && zfsvfs->z_parent == zfsvfs)
	ZTOV(zp)->v_flag \|= VROOT;

	vn_exists(ZTOV(zp));
	}

	void
	zfs_znode_dmu_fini(znode_t *zp)
	{
	ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) \|\|
	zp->z_unlinked \|\|
	ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zp->z_zfsvfs));

	sa_handle_destroy(zp->z_sa_hdl);
	zp->z_sa_hdl = NULL;
	}

	static void
	zfs_vnode_forget(vnode_t *vp)
	{

	/* copied from insmntque_stddtr */
	vp->v_data = NULL;
	vp->v_op = &dead_vnodeops;
	vgone(vp);
	vput(vp);
	}

	/*
	* Construct a new znode/vnode and initialize.
	*
	* This does not do a call to dmu_set_user() that is
	* up to the caller to do, in case you don't want to
	* return the znode
	*/
	static znode_t *
	zfs_znode_alloc(zfsvfs_t zfsvfs, dmu_buf_t db, int blksz,
	dmu_object_type_t obj_type, sa_handle_t *hdl)
	{
	znode_t *zp;
	vnode_t *vp;
	uint64_t mode;
	uint64_t parent;
	#ifdef notyet
	uint64_t mtime[2], ctime[2];
	#endif
	uint64_t projid = ZFS_DEFAULT_PROJID;
	sa_bulk_attr_t bulk[9];
	int count = 0;
	int error;

	zp = zfs_znode_alloc_kmem(KM_SLEEP);

	#ifndef _ZFS_USE_SMR
	KASSERT((zfsvfs->z_parent->z_vfs->mnt_kern_flag & MNTK_FPLOOKUP) == 0,
	("%s: fast path lookup enabled without smr", __func__));
	#endif

	#if __FreeBSD_version >= 1300076
	KASSERT(curthread->td_vp_reserved != NULL,
	("zfs_znode_alloc: getnewvnode without any vnodes reserved"));
	#else
	KASSERT(curthread->td_vp_reserv > 0,
	("zfs_znode_alloc: getnewvnode without any vnodes reserved"));
	#endif
	error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp);
	if (error != 0) {
	zfs_znode_free_kmem(zp);
	return (NULL);
	}
	zp->z_vnode = vp;
	vp->v_data = zp;

	ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));

	zp->z_sa_hdl = NULL;
	zp->z_unlinked = 0;
	zp->z_atime_dirty = 0;
	zp->z_mapcnt = 0;
	zp->z_id = db->db_object;
	zp->z_blksz = blksz;
	zp->z_seq = 0x7A4653;
	zp->z_sync_cnt = 0;
	#if __FreeBSD_version >= 1300139
	atomic_store_ptr(&zp->z_cached_symlink, NULL);
	#endif

	vp = ZTOV(zp);

	zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
	&zp->z_size, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
	&zp->z_links, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
	&zp->z_atime, 16);
	#ifdef notyet
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
	&mtime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	&ctime, 16);
	#endif
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
	&zp->z_uid, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
	&zp->z_gid, 8);

	if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 \|\| zp->z_gen == 0 \|\|
	(dmu_objset_projectquota_enabled(zfsvfs->z_os) &&
	(zp->z_pflags & ZFS_PROJID) &&
	sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs), &projid, 8) != 0)) {
	if (hdl == NULL)
	sa_handle_destroy(zp->z_sa_hdl);
	zfs_vnode_forget(vp);
	zp->z_vnode = NULL;
	zfs_znode_free_kmem(zp);
	return (NULL);
	}

	zp->z_projid = projid;
	zp->z_mode = mode;

	/* Cache the xattr parent id */
	if (zp->z_pflags & ZFS_XATTR)
	zp->z_xattr_parent = parent;

	vp->v_type = IFTOVT((mode_t)mode);

	switch (vp->v_type) {
	case VDIR:
	zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
	break;
	case VFIFO:
	vp->v_op = &zfs_fifoops;
	break;
	case VREG:
	if (parent == zfsvfs->z_shares_dir) {
	- ASSERT(zp->z_uid == 0 && zp->z_gid == 0);
	+ ASSERT0(zp->z_uid);
	+ ASSERT0(zp->z_gid);
	vp->v_op = &zfs_shareops;
	}
	break;
	default:
	break;
	}

	mutex_enter(&zfsvfs->z_znodes_lock);
	list_insert_tail(&zfsvfs->z_all_znodes, zp);
	zfsvfs->z_nr_znodes++;
	zp->z_zfsvfs = zfsvfs;
	mutex_exit(&zfsvfs->z_znodes_lock);

	/*
	* Acquire vnode lock before making it available to the world.
	*/
	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY);
	VN_LOCK_AREC(vp);
	if (vp->v_type != VFIFO)
	VN_LOCK_ASHARE(vp);

	return (zp);
	}

	static uint64_t empty_xattr;
	static uint64_t pad[4];
	static zfs_acl_phys_t acl_phys;
	/*
	* Create a new DMU object to hold a zfs znode.
	*
	* IN: dzp - parent directory for new znode
	* vap - file attributes for new znode
	* tx - dmu transaction id for zap operations
	* cr - credentials of caller
	* flag - flags:
	* IS_ROOT_NODE - new object will be root
	* IS_XATTR - new object is an attribute
	* bonuslen - length of bonus buffer
	* setaclp - File/Dir initial ACL
	* fuidp - Tracks fuid allocation.
	*
	* OUT: zpp - allocated znode
	*
	*/
	void
	zfs_mknode(znode_t dzp, vattr_t vap, dmu_tx_t tx, cred_t cr,
	uint_t flag, znode_t *zpp, zfs_acl_ids_t acl_ids)
	{
	uint64_t crtime[2], atime[2], mtime[2], ctime[2];
	uint64_t mode, size, links, parent, pflags;
	uint64_t dzp_pflags = 0;
	uint64_t rdev = 0;
	zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
	dmu_buf_t *db;
	timestruc_t now;
	uint64_t gen, obj;
	int err;
	int bonuslen;
	int dnodesize;
	sa_handle_t *sa_hdl;
	dmu_object_type_t obj_type;
	sa_bulk_attr_t *sa_attrs;
	int cnt = 0;
	zfs_acl_locator_cb_t locate = { 0 };

	- ASSERT(vap && ((vap->va_mask & AT_MODE) == AT_MODE));
	+ ASSERT3P(vap, !=, NULL);
	+ ASSERT3U((vap->va_mask & AT_MODE), ==, AT_MODE);

	if (zfsvfs->z_replay) {
	obj = vap->va_nodeid;
	now = vap->va_ctime; /* see zfs_replay_create() */
	gen = vap->va_nblocks; /* ditto */
	dnodesize = vap->va_fsid; /* ditto */
	} else {
	obj = 0;
	vfs_timestamp(&now);
	gen = dmu_tx_get_txg(tx);
	dnodesize = dmu_objset_dnodesize(zfsvfs->z_os);
	}

	if (dnodesize == 0)
	dnodesize = DNODE_MIN_SIZE;

	obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
	bonuslen = (obj_type == DMU_OT_SA) ?
	DN_BONUS_SIZE(dnodesize) : ZFS_OLD_ZNODE_PHYS_SIZE;

	/*
	* Create a new DMU object.
	*/
	/*
	* There's currently no mechanism for pre-reading the blocks that will
	* be needed to allocate a new object, so we accept the small chance
	* that there will be an i/o error and we will fail one of the
	* assertions below.
	*/
	if (vap->va_type == VDIR) {
	if (zfsvfs->z_replay) {
	VERIFY0(zap_create_claim_norm_dnsize(zfsvfs->z_os, obj,
	zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
	obj_type, bonuslen, dnodesize, tx));
	} else {
	obj = zap_create_norm_dnsize(zfsvfs->z_os,
	zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
	obj_type, bonuslen, dnodesize, tx);
	}
	} else {
	if (zfsvfs->z_replay) {
	VERIFY0(dmu_object_claim_dnsize(zfsvfs->z_os, obj,
	DMU_OT_PLAIN_FILE_CONTENTS, 0,
	obj_type, bonuslen, dnodesize, tx));
	} else {
	obj = dmu_object_alloc_dnsize(zfsvfs->z_os,
	DMU_OT_PLAIN_FILE_CONTENTS, 0,
	obj_type, bonuslen, dnodesize, tx);
	}
	}

	ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
	- VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
	+ VERIFY0(sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));

	/*
	* If this is the root, fix up the half-initialized parent pointer
	* to reference the just-allocated physical data area.
	*/
	if (flag & IS_ROOT_NODE) {
	dzp->z_id = obj;
	} else {
	dzp_pflags = dzp->z_pflags;
	}

	/*
	* If parent is an xattr, so am I.
	*/
	if (dzp_pflags & ZFS_XATTR) {
	flag \|= IS_XATTR;
	}

	if (zfsvfs->z_use_fuids)
	pflags = ZFS_ARCHIVE \| ZFS_AV_MODIFIED;
	else
	pflags = 0;

	if (vap->va_type == VDIR) {
	size = 2; /* contents ("." and "..") */
	links = (flag & (IS_ROOT_NODE \| IS_XATTR)) ? 2 : 1;
	} else {
	size = links = 0;
	}

	if (vap->va_type == VBLK \|\| vap->va_type == VCHR) {
	rdev = zfs_expldev(vap->va_rdev);
	}

	parent = dzp->z_id;
	mode = acl_ids->z_mode;
	if (flag & IS_XATTR)
	pflags \|= ZFS_XATTR;

	/*
	* No execs denied will be determined when zfs_mode_compute() is called.
	*/
	pflags \|= acl_ids->z_aclp->z_hints &
	(ZFS_ACL_TRIVIAL\|ZFS_INHERIT_ACE\|ZFS_ACL_AUTO_INHERIT\|
	ZFS_ACL_DEFAULTED\|ZFS_ACL_PROTECTED);

	ZFS_TIME_ENCODE(&now, crtime);
	ZFS_TIME_ENCODE(&now, ctime);

	if (vap->va_mask & AT_ATIME) {
	ZFS_TIME_ENCODE(&vap->va_atime, atime);
	} else {
	ZFS_TIME_ENCODE(&now, atime);
	}

	if (vap->va_mask & AT_MTIME) {
	ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
	} else {
	ZFS_TIME_ENCODE(&now, mtime);
	}

	/* Now add in all of the "SA" attributes */
	- VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
	+ VERIFY0(sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
	&sa_hdl));

	/*
	* Setup the array of attributes to be replaced/set on the new file
	*
	* order for DMU_OT_ZNODE is critical since it needs to be constructed
	* in the old znode_phys_t format. Don't change this ordering
	*/
	sa_attrs = kmem_alloc(sizeof (sa_bulk_attr_t) * ZPL_END, KM_SLEEP);

	if (obj_type == DMU_OT_ZNODE) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
	NULL, &atime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
	NULL, &mtime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
	NULL, &ctime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
	NULL, &crtime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
	NULL, &gen, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
	NULL, &mode, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
	NULL, &size, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
	NULL, &parent, 8);
	} else {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
	NULL, &mode, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
	NULL, &size, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
	NULL, &gen, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs),
	NULL, &acl_ids->z_fuid, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs),
	NULL, &acl_ids->z_fgid, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
	NULL, &parent, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
	NULL, &pflags, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
	NULL, &atime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
	NULL, &mtime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
	NULL, &ctime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
	NULL, &crtime, 16);
	}

	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);

	if (obj_type == DMU_OT_ZNODE) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL,
	&empty_xattr, 8);
	}
	if (obj_type == DMU_OT_ZNODE \|\|
	(vap->va_type == VBLK \|\| vap->va_type == VCHR)) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs),
	NULL, &rdev, 8);

	}
	if (obj_type == DMU_OT_ZNODE) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
	NULL, &pflags, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
	&acl_ids->z_fuid, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
	&acl_ids->z_fgid, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad,
	sizeof (uint64_t) * 4);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
	&acl_phys, sizeof (zfs_acl_phys_t));
	} else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
	&acl_ids->z_aclp->z_acl_count, 8);
	locate.cb_aclp = acl_ids->z_aclp;
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs),
	zfs_acl_data_locator, &locate,
	acl_ids->z_aclp->z_acl_bytes);
	mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
	acl_ids->z_fuid, acl_ids->z_fgid);
	}

	- VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
	+ VERIFY0(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx));

	if (!(flag & IS_ROOT_NODE)) {
	*zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
	- ASSERT(*zpp != NULL);
	+ ASSERT3P(*zpp, !=, NULL);
	} else {
	/*
	* If we are creating the root node, the "parent" we
	* passed in is the znode for the root.
	*/
	*zpp = dzp;

	(*zpp)->z_sa_hdl = sa_hdl;
	}

	(*zpp)->z_pflags = pflags;
	(*zpp)->z_mode = mode;
	(*zpp)->z_dnodesize = dnodesize;

	if (vap->va_mask & AT_XVATTR)
	zfs_xvattr_set(zpp, (xvattr_t )vap, tx);

	if (obj_type == DMU_OT_ZNODE \|\|
	acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
	VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
	}
	if (!(flag & IS_ROOT_NODE)) {
	vnode_t *vp;

	vp = ZTOV(*zpp);
	vp->v_vflag \|= VV_FORCEINSMQ;
	err = insmntque(vp, zfsvfs->z_vfs);
	vp->v_vflag &= ~VV_FORCEINSMQ;
	KASSERT(err == 0, ("insmntque() failed: error %d", err));
	}
	kmem_free(sa_attrs, sizeof (sa_bulk_attr_t) * ZPL_END);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
	}

	/*
	* Update in-core attributes. It is assumed the caller will be doing an
	* sa_bulk_update to push the changes out.
	*/
	void
	zfs_xvattr_set(znode_t zp, xvattr_t xvap, dmu_tx_t *tx)
	{
	xoptattr_t *xoap;

	xoap = xva_getxoptattr(xvap);
	- ASSERT(xoap);
	+ ASSERT3P(xoap, !=, NULL);

	ASSERT_VOP_IN_SEQC(ZTOV(zp));

	if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
	uint64_t times[2];
	ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
	(void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs),
	&times, sizeof (times), tx);
	XVA_SET_RTN(xvap, XAT_CREATETIME);
	}
	if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
	ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_READONLY);
	}
	if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
	ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_HIDDEN);
	}
	if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
	ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_SYSTEM);
	}
	if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
	ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_ARCHIVE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
	ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_IMMUTABLE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
	ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_NOUNLINK);
	}
	if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
	ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_APPENDONLY);
	}
	if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
	ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_NODUMP);
	}
	if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
	ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_OPAQUE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
	ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
	xoap->xoa_av_quarantined, zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
	}
	if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
	ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
	}
	if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
	zfs_sa_set_scanstamp(zp, xvap, tx);
	XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
	}
	if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
	ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_REPARSE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
	ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_OFFLINE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
	ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_SPARSE);
	}
	}

	int
	zfs_zget(zfsvfs_t zfsvfs, uint64_t obj_num, znode_t *zpp)
	{
	dmu_object_info_t doi;
	dmu_buf_t *db;
	znode_t *zp;
	vnode_t *vp;
	sa_handle_t *hdl;
	struct thread *td;
	int locked;
	int err;

	td = curthread;
	getnewvnode_reserve_();
	again:
	*zpp = NULL;
	ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);

	err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
	if (err) {
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	getnewvnode_drop_reserve();
	return (err);
	}

	dmu_object_info_from_db(db, &doi);
	if (doi.doi_bonus_type != DMU_OT_SA &&
	(doi.doi_bonus_type != DMU_OT_ZNODE \|\|
	(doi.doi_bonus_type == DMU_OT_ZNODE &&
	doi.doi_bonus_size < sizeof (znode_phys_t)))) {
	sa_buf_rele(db, NULL);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	getnewvnode_drop_reserve();
	return (SET_ERROR(EINVAL));
	}

	hdl = dmu_buf_get_user(db);
	if (hdl != NULL) {
	zp = sa_get_userdata(hdl);

	/*
	* Since "SA" does immediate eviction we
	* should never find a sa handle that doesn't
	* know about the znode.
	*/
	ASSERT3P(zp, !=, NULL);
	ASSERT3U(zp->z_id, ==, obj_num);
	if (zp->z_unlinked) {
	err = SET_ERROR(ENOENT);
	} else {
	vp = ZTOV(zp);
	/*
	* Don't let the vnode disappear after
	* ZFS_OBJ_HOLD_EXIT.
	*/
	VN_HOLD(vp);
	*zpp = zp;
	err = 0;
	}

	sa_buf_rele(db, NULL);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);

	if (err) {
	getnewvnode_drop_reserve();
	return (err);
	}

	locked = VOP_ISLOCKED(vp);
	VI_LOCK(vp);
	if (VN_IS_DOOMED(vp) && locked != LK_EXCLUSIVE) {
	/*
	* The vnode is doomed and this thread doesn't
	* hold the exclusive lock on it, so the vnode
	* must be being reclaimed by another thread.
	* Otherwise the doomed vnode is being reclaimed
	* by this thread and zfs_zget is called from
	* ZIL internals.
	*/
	VI_UNLOCK(vp);

	/*
	* XXX vrele() locks the vnode when the last reference
	* is dropped. Although in this case the vnode is
	* doomed / dead and so no inactivation is required,
	* the vnode lock is still acquired. That could result
	* in a LOR with z_teardown_lock if another thread holds
	* the vnode's lock and tries to take z_teardown_lock.
	* But that is only possible if the other thread peforms
	* a ZFS vnode operation on the vnode. That either
	* should not happen if the vnode is dead or the thread
	* should also have a reference to the vnode and thus
	* our reference is not last.
	*/
	VN_RELE(vp);
	goto again;
	}
	VI_UNLOCK(vp);
	getnewvnode_drop_reserve();
	return (err);
	}

	/*
	* Not found create new znode/vnode
	* but only if file exists.
	*
	* There is a small window where zfs_vget() could
	* find this object while a file create is still in
	* progress. This is checked for in zfs_znode_alloc()
	*
	* if zfs_znode_alloc() fails it will drop the hold on the
	* bonus buffer.
	*/
	zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size,
	doi.doi_bonus_type, NULL);
	if (zp == NULL) {
	err = SET_ERROR(ENOENT);
	} else {
	*zpp = zp;
	}
	if (err == 0) {
	vnode_t *vp = ZTOV(zp);

	err = insmntque(vp, zfsvfs->z_vfs);
	if (err == 0) {
	vp->v_hash = obj_num;
	VOP_UNLOCK1(vp);
	} else {
	zp->z_vnode = NULL;
	zfs_znode_dmu_fini(zp);
	zfs_znode_free(zp);
	*zpp = NULL;
	}
	}
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	getnewvnode_drop_reserve();
	return (err);
	}

	int
	zfs_rezget(znode_t *zp)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	dmu_object_info_t doi;
	dmu_buf_t *db;
	vnode_t *vp;
	uint64_t obj_num = zp->z_id;
	uint64_t mode, size;
	sa_bulk_attr_t bulk[8];
	int err;
	int count = 0;
	uint64_t gen;

	/*
	* Remove cached pages before reloading the znode, so that they are not
	* lingering after we run into any error. Ideally, we should vgone()
	* the vnode in case of error, but currently we cannot do that
	* because of the LOR between the vnode lock and z_teardown_lock.
	* So, instead, we have to "doom" the znode in the illumos style.
	*/
	vp = ZTOV(zp);
	vn_pages_remove(vp, 0, 0);

	ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);

	mutex_enter(&zp->z_acl_lock);
	if (zp->z_acl_cached) {
	zfs_acl_free(zp->z_acl_cached);
	zp->z_acl_cached = NULL;
	}
	-
	mutex_exit(&zp->z_acl_lock);
	- ASSERT(zp->z_sa_hdl == NULL);
	+
	+ rw_enter(&zp->z_xattr_lock, RW_WRITER);
	+ if (zp->z_xattr_cached) {
	+ nvlist_free(zp->z_xattr_cached);
	+ zp->z_xattr_cached = NULL;
	+ }
	+ rw_exit(&zp->z_xattr_lock);
	+
	+ ASSERT3P(zp->z_sa_hdl, ==, NULL);
	err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
	if (err) {
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	return (err);
	}

	dmu_object_info_from_db(db, &doi);
	if (doi.doi_bonus_type != DMU_OT_SA &&
	(doi.doi_bonus_type != DMU_OT_ZNODE \|\|
	(doi.doi_bonus_type == DMU_OT_ZNODE &&
	doi.doi_bonus_size < sizeof (znode_phys_t)))) {
	sa_buf_rele(db, NULL);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	return (SET_ERROR(EINVAL));
	}

	zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
	size = zp->z_size;

	/* reload cached values */
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
	&gen, sizeof (gen));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
	&zp->z_size, sizeof (zp->z_size));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
	&zp->z_links, sizeof (zp->z_links));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, sizeof (zp->z_pflags));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
	&zp->z_atime, sizeof (zp->z_atime));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
	&zp->z_uid, sizeof (zp->z_uid));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
	&zp->z_gid, sizeof (zp->z_gid));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
	&mode, sizeof (mode));

	if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
	zfs_znode_dmu_fini(zp);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	return (SET_ERROR(EIO));
	}

	zp->z_mode = mode;

	if (gen != zp->z_gen) {
	zfs_znode_dmu_fini(zp);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	return (SET_ERROR(EIO));
	}

	/*
	* It is highly improbable but still quite possible that two
	* objects in different datasets are created with the same
	* object numbers and in transaction groups with the same
	* numbers. znodes corresponding to those objects would
	* have the same z_id and z_gen, but their other attributes
	* may be different.
	* zfs recv -F may replace one of such objects with the other.
	* As a result file properties recorded in the replaced
	* object's vnode may no longer match the received object's
	* properties. At present the only cached property is the
	* files type recorded in v_type.
	* So, handle this case by leaving the old vnode and znode
	* disassociated from the actual object. A new vnode and a
	* znode will be created if the object is accessed
	* (e.g. via a look-up). The old vnode and znode will be
	* recycled when the last vnode reference is dropped.
	*/
	if (vp->v_type != IFTOVT((mode_t)zp->z_mode)) {
	zfs_znode_dmu_fini(zp);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	return (SET_ERROR(EIO));
	}

	/*
	* If the file has zero links, then it has been unlinked on the send
	* side and it must be in the received unlinked set.
	* We call zfs_znode_dmu_fini() now to prevent any accesses to the
	* stale data and to prevent automatically removal of the file in
	* zfs_zinactive(). The file will be removed either when it is removed
	* on the send side and the next incremental stream is received or
	* when the unlinked set gets processed.
	*/
	zp->z_unlinked = (zp->z_links == 0);
	if (zp->z_unlinked) {
	zfs_znode_dmu_fini(zp);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
	return (0);
	}

	zp->z_blksz = doi.doi_data_block_size;
	if (zp->z_size != size)
	vnode_pager_setsize(vp, zp->z_size);

	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);

	return (0);
	}

	void
	zfs_znode_delete(znode_t zp, dmu_tx_t tx)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	objset_t *os = zfsvfs->z_os;
	uint64_t obj = zp->z_id;
	uint64_t acl_obj = zfs_external_acl(zp);

	ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
	if (acl_obj) {
	VERIFY(!zp->z_is_sa);
	- VERIFY(0 == dmu_object_free(os, acl_obj, tx));
	+ VERIFY0(dmu_object_free(os, acl_obj, tx));
	}
	- VERIFY(0 == dmu_object_free(os, obj, tx));
	+ VERIFY0(dmu_object_free(os, obj, tx));
	zfs_znode_dmu_fini(zp);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
	zfs_znode_free(zp);
	}

	void
	zfs_zinactive(znode_t *zp)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	uint64_t z_id = zp->z_id;

	- ASSERT(zp->z_sa_hdl);
	+ ASSERT3P(zp->z_sa_hdl, !=, NULL);

	/*
	* Don't allow a zfs_zget() while were trying to release this znode
	*/
	ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);

	/*
	* If this was the last reference to a file with no links, remove
	* the file from the file system unless the file system is mounted
	* read-only. That can happen, for example, if the file system was
	* originally read-write, the file was opened, then unlinked and
	* the file system was made read-only before the file was finally
	* closed. The file will remain in the unlinked set.
	*/
	if (zp->z_unlinked) {
	ASSERT(!zfsvfs->z_issnap);
	if ((zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) == 0) {
	ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
	zfs_rmnode(zp);
	return;
	}
	}

	zfs_znode_dmu_fini(zp);
	ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
	zfs_znode_free(zp);
	}

	void
	zfs_znode_free(znode_t *zp)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	#if __FreeBSD_version >= 1300139
	char *symlink;
	#endif

	- ASSERT(zp->z_sa_hdl == NULL);
	+ ASSERT3P(zp->z_sa_hdl, ==, NULL);
	zp->z_vnode = NULL;
	mutex_enter(&zfsvfs->z_znodes_lock);
	POINTER_INVALIDATE(&zp->z_zfsvfs);
	list_remove(&zfsvfs->z_all_znodes, zp);
	zfsvfs->z_nr_znodes--;
	mutex_exit(&zfsvfs->z_znodes_lock);
	symlink = atomic_load_ptr(&zp->z_cached_symlink);
	if (symlink != NULL) {
	atomic_store_rel_ptr((uintptr_t *)&zp->z_cached_symlink, (uintptr_t)NULL);
	cache_symlink_free(symlink, strlen(symlink) + 1);
	}

	#if __FreeBSD_version >= 1300139
	symlink = atomic_load_ptr(&zp->z_cached_symlink);
	if (symlink != NULL) {
	atomic_store_rel_ptr((uintptr_t *)&zp->z_cached_symlink,
	(uintptr_t)NULL);
	cache_symlink_free(symlink, strlen(symlink) + 1);
	}
	#endif

	if (zp->z_acl_cached) {
	zfs_acl_free(zp->z_acl_cached);
	zp->z_acl_cached = NULL;
	}

	zfs_znode_free_kmem(zp);
	}

	void
	zfs_tstamp_update_setup_ext(znode_t *zp, uint_t flag, uint64_t mtime[2],
	uint64_t ctime[2], boolean_t have_tx)
	{
	timestruc_t now;

	vfs_timestamp(&now);

	if (have_tx) { /* will sa_bulk_update happen really soon? */
	zp->z_atime_dirty = 0;
	zp->z_seq++;
	} else {
	zp->z_atime_dirty = 1;
	}

	if (flag & AT_ATIME) {
	ZFS_TIME_ENCODE(&now, zp->z_atime);
	}

	if (flag & AT_MTIME) {
	ZFS_TIME_ENCODE(&now, mtime);
	if (zp->z_zfsvfs->z_use_fuids) {
	zp->z_pflags \|= (ZFS_ARCHIVE \|
	ZFS_AV_MODIFIED);
	}
	}

	if (flag & AT_CTIME) {
	ZFS_TIME_ENCODE(&now, ctime);
	if (zp->z_zfsvfs->z_use_fuids)
	zp->z_pflags \|= ZFS_ARCHIVE;
	}
	}


	void
	zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
	uint64_t ctime[2])
	{
	zfs_tstamp_update_setup_ext(zp, flag, mtime, ctime, B_TRUE);
	}
	/*
	* Grow the block size for a file.
	*
	* IN: zp - znode of file to free data in.
	* size - requested block size
	* tx - open transaction.
	*
	* NOTE: this function assumes that the znode is write locked.
	*/
	void
	zfs_grow_blocksize(znode_t zp, uint64_t size, dmu_tx_t tx)
	{
	int error;
	u_longlong_t dummy;

	if (size <= zp->z_blksz)
	return;
	/*
	* If the file size is already greater than the current blocksize,
	* we will not grow. If there is more than one block in a file,
	* the blocksize cannot change.
	*/
	if (zp->z_blksz && zp->z_size > zp->z_blksz)
	return;

	error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id,
	size, 0, tx);

	if (error == ENOTSUP)
	return;
	ASSERT0(error);

	/* What blocksize did we actually get? */
	dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
	}

	/*
	* Increase the file length
	*
	* IN: zp - znode of file to free data in.
	* end - new end-of-file
	*
	* RETURN: 0 on success, error code on failure
	*/
	static int
	zfs_extend(znode_t *zp, uint64_t end)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	dmu_tx_t *tx;
	zfs_locked_range_t *lr;
	uint64_t newblksz;
	int error;

	/*
	* We will change zp_size, lock the whole file.
	*/
	lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);

	/*
	* Nothing to do if file already at desired length.
	*/
	if (end <= zp->z_size) {
	zfs_rangelock_exit(lr);
	return (0);
	}
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	if (end > zp->z_blksz &&
	(!ISP2(zp->z_blksz) \|\| zp->z_blksz < zfsvfs->z_max_blksz)) {
	/*
	* We are growing the file past the current block size.
	*/
	if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) {
	/*
	* File's blocksize is already larger than the
	* "recordsize" property. Only let it grow to
	* the next power of 2.
	*/
	ASSERT(!ISP2(zp->z_blksz));
	newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
	} else {
	newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz);
	}
	dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
	} else {
	newblksz = 0;
	}

	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	zfs_rangelock_exit(lr);
	return (error);
	}

	if (newblksz)
	zfs_grow_blocksize(zp, newblksz, tx);

	zp->z_size = end;

	- VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
	+ VERIFY0(sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
	&zp->z_size, sizeof (zp->z_size), tx));

	vnode_pager_setsize(ZTOV(zp), end);

	zfs_rangelock_exit(lr);

	dmu_tx_commit(tx);

	return (0);
	}

	/*
	* Free space in a file.
	*
	* IN: zp - znode of file to free data in.
	* off - start of section to free.
	* len - length of section to free.
	*
	* RETURN: 0 on success, error code on failure
	*/
	static int
	zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	zfs_locked_range_t *lr;
	int error;

	/*
	* Lock the range being freed.
	*/
	lr = zfs_rangelock_enter(&zp->z_rangelock, off, len, RL_WRITER);

	/*
	* Nothing to do if file already at desired length.
	*/
	if (off >= zp->z_size) {
	zfs_rangelock_exit(lr);
	return (0);
	}

	if (off + len > zp->z_size)
	len = zp->z_size - off;

	error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);

	if (error == 0) {
	/*
	* In FreeBSD we cannot free block in the middle of a file,
	* but only at the end of a file, so this code path should
	* never happen.
	*/
	vnode_pager_setsize(ZTOV(zp), off);
	}

	zfs_rangelock_exit(lr);

	return (error);
	}

	/*
	* Truncate a file
	*
	* IN: zp - znode of file to free data in.
	* end - new end-of-file.
	*
	* RETURN: 0 on success, error code on failure
	*/
	static int
	zfs_trunc(znode_t *zp, uint64_t end)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	vnode_t *vp = ZTOV(zp);
	dmu_tx_t *tx;
	zfs_locked_range_t *lr;
	int error;
	sa_bulk_attr_t bulk[2];
	int count = 0;

	/*
	* We will change zp_size, lock the whole file.
	*/
	lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);

	/*
	* Nothing to do if file already at desired length.
	*/
	if (end >= zp->z_size) {
	zfs_rangelock_exit(lr);
	return (0);
	}

	error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end,
	DMU_OBJECT_END);
	if (error) {
	zfs_rangelock_exit(lr);
	return (error);
	}
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	dmu_tx_mark_netfree(tx);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	zfs_rangelock_exit(lr);
	return (error);
	}

	zp->z_size = end;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
	NULL, &zp->z_size, sizeof (zp->z_size));

	if (end == 0) {
	zp->z_pflags &= ~ZFS_SPARSE;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
	NULL, &zp->z_pflags, 8);
	}
	- VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);
	+ VERIFY0(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));

	dmu_tx_commit(tx);

	/*
	* Clear any mapped pages in the truncated region. This has to
	* happen outside of the transaction to avoid the possibility of
	* a deadlock with someone trying to push a page that we are
	* about to invalidate.
	*/
	vnode_pager_setsize(vp, end);

	zfs_rangelock_exit(lr);

	return (0);
	}

	/*
	* Free space in a file
	*
	* IN: zp - znode of file to free data in.
	* off - start of range
	* len - end of range (0 => EOF)
	* flag - current file open mode flags.
	* log - TRUE if this action should be logged
	*
	* RETURN: 0 on success, error code on failure
	*/
	int
	zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
	{
	dmu_tx_t *tx;
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	zilog_t *zilog = zfsvfs->z_log;
	uint64_t mode;
	uint64_t mtime[2], ctime[2];
	sa_bulk_attr_t bulk[3];
	int count = 0;
	int error;

	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
	sizeof (mode))) != 0)
	return (error);

	if (off > zp->z_size) {
	error = zfs_extend(zp, off+len);
	if (error == 0 && log)
	goto log;
	else
	return (error);
	}

	if (len == 0) {
	error = zfs_trunc(zp, off);
	} else {
	if ((error = zfs_free_range(zp, off, len)) == 0 &&
	off + len > zp->z_size)
	error = zfs_extend(zp, off+len);
	}
	if (error \|\| !log)
	return (error);
	log:
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	return (error);
	}

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
	NULL, &zp->z_pflags, 8);
	zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
	error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
	- ASSERT(error == 0);
	+ ASSERT0(error);

	zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);

	dmu_tx_commit(tx);
	return (0);
	}

	void
	zfs_create_fs(objset_t os, cred_t cr, nvlist_t zplprops, dmu_tx_t tx)
	{
	uint64_t moid, obj, sa_obj, version;
	uint64_t sense = ZFS_CASE_SENSITIVE;
	uint64_t norm = 0;
	nvpair_t *elem;
	int error;
	int i;
	znode_t *rootzp = NULL;
	zfsvfs_t *zfsvfs;
	vattr_t vattr;
	znode_t *zp;
	zfs_acl_ids_t acl_ids;

	/*
	* First attempt to create master node.
	*/
	/*
	* In an empty objset, there are no blocks to read and thus
	* there can be no i/o errors (which we assert below).
	*/
	moid = MASTER_NODE_OBJ;
	error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
	DMU_OT_NONE, 0, tx);
	- ASSERT(error == 0);
	+ ASSERT0(error);

	/*
	* Set starting attributes.
	*/
	version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
	elem = NULL;
	while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
	/* For the moment we expect all zpl props to be uint64_ts */
	uint64_t val;
	char *name;

	- ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
	- VERIFY(nvpair_value_uint64(elem, &val) == 0);
	+ ASSERT3S(nvpair_type(elem), ==, DATA_TYPE_UINT64);
	+ val = fnvpair_value_uint64(elem);
	name = nvpair_name(elem);
	if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
	if (val < version)
	version = val;
	} else {
	error = zap_update(os, moid, name, 8, 1, &val, tx);
	}
	- ASSERT(error == 0);
	+ ASSERT0(error);
	if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
	norm = val;
	else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
	sense = val;
	}
	- ASSERT(version != 0);
	+ ASSERT3U(version, !=, 0);
	error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);

	/*
	* Create zap object used for SA attribute registration
	*/

	if (version >= ZPL_VERSION_SA) {
	sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
	DMU_OT_NONE, 0, tx);
	error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
	- ASSERT(error == 0);
	+ ASSERT0(error);
	} else {
	sa_obj = 0;
	}
	/*
	* Create a delete queue.
	*/
	obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);

	error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
	- ASSERT(error == 0);
	+ ASSERT0(error);

	/*
	* Create root znode. Create minimal znode/vnode/zfsvfs
	* to allow zfs_mknode to work.
	*/
	VATTR_NULL(&vattr);
	vattr.va_mask = AT_MODE\|AT_UID\|AT_GID;
	vattr.va_type = VDIR;
	vattr.va_mode = S_IFDIR\|0755;
	vattr.va_uid = crgetuid(cr);
	vattr.va_gid = crgetgid(cr);

	zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);

	rootzp = zfs_znode_alloc_kmem(KM_SLEEP);
	ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
	rootzp->z_unlinked = 0;
	rootzp->z_atime_dirty = 0;
	rootzp->z_is_sa = USE_SA(version, os);

	zfsvfs->z_os = os;
	zfsvfs->z_parent = zfsvfs;
	zfsvfs->z_version = version;
	zfsvfs->z_use_fuids = USE_FUIDS(version, os);
	zfsvfs->z_use_sa = USE_SA(version, os);
	zfsvfs->z_norm = norm;

	error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
	&zfsvfs->z_attr_table);

	- ASSERT(error == 0);
	+ ASSERT0(error);

	/*
	* Fold case on file systems that are always or sometimes case
	* insensitive.
	*/
	if (sense == ZFS_CASE_INSENSITIVE \|\| sense == ZFS_CASE_MIXED)
	zfsvfs->z_norm \|= U8_TEXTPREP_TOUPPER;

	mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
	offsetof(znode_t, z_link_node));

	for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
	mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);

	rootzp->z_zfsvfs = zfsvfs;
	- VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
	+ VERIFY0(zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
	cr, NULL, &acl_ids));
	zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
	ASSERT3P(zp, ==, rootzp);
	error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
	- ASSERT(error == 0);
	+ ASSERT0(error);
	zfs_acl_ids_free(&acl_ids);
	POINTER_INVALIDATE(&rootzp->z_zfsvfs);

	sa_handle_destroy(rootzp->z_sa_hdl);
	zfs_znode_free_kmem(rootzp);

	/*
	* Create shares directory
	*/

	error = zfs_create_share_dir(zfsvfs, tx);

	- ASSERT(error == 0);
	+ ASSERT0(error);

	for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
	mutex_destroy(&zfsvfs->z_hold_mtx[i]);
	kmem_free(zfsvfs, sizeof (zfsvfs_t));
	}
	#endif /* _KERNEL */

	static int
	zfs_sa_setup(objset_t osp, sa_attr_type_t *sa_table)
	{
	uint64_t sa_obj = 0;
	int error;

	error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
	if (error != 0 && error != ENOENT)
	return (error);

	error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
	return (error);
	}

	static int
	zfs_grab_sa_handle(objset_t osp, uint64_t obj, sa_handle_t *hdlp,
	dmu_buf_t *db, void tag)
	{
	dmu_object_info_t doi;
	int error;

	if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
	return (error);

	dmu_object_info_from_db(*db, &doi);
	if ((doi.doi_bonus_type != DMU_OT_SA &&
	doi.doi_bonus_type != DMU_OT_ZNODE) \|\|
	(doi.doi_bonus_type == DMU_OT_ZNODE &&
	doi.doi_bonus_size < sizeof (znode_phys_t))) {
	sa_buf_rele(*db, tag);
	return (SET_ERROR(ENOTSUP));
	}

	error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
	if (error != 0) {
	sa_buf_rele(*db, tag);
	return (error);
	}

	return (0);
	}

	static void
	zfs_release_sa_handle(sa_handle_t hdl, dmu_buf_t db, void *tag)
	{
	sa_handle_destroy(hdl);
	sa_buf_rele(db, tag);
	}

	/*
	* Given an object number, return its parent object number and whether
	* or not the object is an extended attribute directory.
	*/
	static int
	zfs_obj_to_pobj(objset_t osp, sa_handle_t hdl, sa_attr_type_t *sa_table,
	uint64_t pobjp, int is_xattrdir)
	{
	uint64_t parent;
	uint64_t pflags;
	uint64_t mode;
	uint64_t parent_mode;
	sa_bulk_attr_t bulk[3];
	sa_handle_t *sa_hdl;
	dmu_buf_t *sa_db;
	int count = 0;
	int error;

	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
	&parent, sizeof (parent));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
	&pflags, sizeof (pflags));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
	&mode, sizeof (mode));

	if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
	return (error);

	/*
	* When a link is removed its parent pointer is not changed and will
	* be invalid. There are two cases where a link is removed but the
	* file stays around, when it goes to the delete queue and when there
	* are additional links.
	*/
	error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
	if (error != 0)
	return (error);

	error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
	zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
	if (error != 0)
	return (error);

	*is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);

	/*
	* Extended attributes can be applied to files, directories, etc.
	* Otherwise the parent must be a directory.
	*/
	if (!*is_xattrdir && !S_ISDIR(parent_mode))
	return (SET_ERROR(EINVAL));

	*pobjp = parent;

	return (0);
	}

	/*
	* Given an object number, return some zpl level statistics
	*/
	static int
	zfs_obj_to_stats_impl(sa_handle_t hdl, sa_attr_type_t sa_table,
	zfs_stat_t *sb)
	{
	sa_bulk_attr_t bulk[4];
	int count = 0;

	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
	&sb->zs_mode, sizeof (sb->zs_mode));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
	&sb->zs_gen, sizeof (sb->zs_gen));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
	&sb->zs_links, sizeof (sb->zs_links));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
	&sb->zs_ctime, sizeof (sb->zs_ctime));

	return (sa_bulk_lookup(hdl, bulk, count));
	}

	static int
	zfs_obj_to_path_impl(objset_t osp, uint64_t obj, sa_handle_t hdl,
	sa_attr_type_t sa_table, char buf, int len)
	{
	sa_handle_t *sa_hdl;
	sa_handle_t *prevhdl = NULL;
	dmu_buf_t *prevdb = NULL;
	dmu_buf_t *sa_db = NULL;
	char *path = buf + len - 1;
	int error;

	*path = '\0';
	sa_hdl = hdl;

	uint64_t deleteq_obj;
	VERIFY0(zap_lookup(osp, MASTER_NODE_OBJ,
	ZFS_UNLINKED_SET, sizeof (uint64_t), 1, &deleteq_obj));
	error = zap_lookup_int(osp, deleteq_obj, obj);
	if (error == 0) {
	return (ESTALE);
	} else if (error != ENOENT) {
	return (error);
	}
	error = 0;

	for (;;) {
	uint64_t pobj;
	char component[MAXNAMELEN + 2];
	size_t complen;
	int is_xattrdir;

	if (prevdb) {
	- ASSERT(prevhdl != NULL);
	+ ASSERT3P(prevhdl, !=, NULL);
	zfs_release_sa_handle(prevhdl, prevdb, FTAG);
	}

	if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
	&is_xattrdir)) != 0)
	break;

	if (pobj == obj) {
	if (path[0] != '/')
	*--path = '/';
	break;
	}

	component[0] = '/';
	if (is_xattrdir) {
	(void) sprintf(component + 1, "<xattrdir>");
	} else {
	error = zap_value_search(osp, pobj, obj,
	ZFS_DIRENT_OBJ(-1ULL), component + 1);
	if (error != 0)
	break;
	}

	complen = strlen(component);
	path -= complen;
	- ASSERT(path >= buf);
	+ ASSERT3P(path, >=, buf);
	bcopy(component, path, complen);
	obj = pobj;

	if (sa_hdl != hdl) {
	prevhdl = sa_hdl;
	prevdb = sa_db;
	}
	error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
	if (error != 0) {
	sa_hdl = prevhdl;
	sa_db = prevdb;
	break;
	}
	}

	if (sa_hdl != NULL && sa_hdl != hdl) {
	- ASSERT(sa_db != NULL);
	+ ASSERT3P(sa_db, !=, NULL);
	zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
	}

	if (error == 0)
	(void) memmove(buf, path, buf + len - path);

	return (error);
	}

	int
	zfs_obj_to_path(objset_t osp, uint64_t obj, char buf, int len)
	{
	sa_attr_type_t *sa_table;
	sa_handle_t *hdl;
	dmu_buf_t *db;
	int error;

	error = zfs_sa_setup(osp, &sa_table);
	if (error != 0)
	return (error);

	error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
	if (error != 0)
	return (error);

	error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);

	zfs_release_sa_handle(hdl, db, FTAG);
	return (error);
	}

	int
	zfs_obj_to_stats(objset_t osp, uint64_t obj, zfs_stat_t sb,
	char *buf, int len)
	{
	char *path = buf + len - 1;
	sa_attr_type_t *sa_table;
	sa_handle_t *hdl;
	dmu_buf_t *db;
	int error;

	*path = '\0';

	error = zfs_sa_setup(osp, &sa_table);
	if (error != 0)
	return (error);

	error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
	if (error != 0)
	return (error);

	error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
	if (error != 0) {
	zfs_release_sa_handle(hdl, db, FTAG);
	return (error);
	}

	error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);

	zfs_release_sa_handle(hdl, db, FTAG);
	return (error);
	}


	void
	zfs_znode_update_vfs(znode_t *zp)
	{
	vm_object_t object;

	if ((object = ZTOV(zp)->v_object) == NULL \|\|
	zp->z_size == object->un_pager.vnp.vnp_size)
	return;

	vnode_pager_setsize(ZTOV(zp), zp->z_size);
	}


	#ifdef _KERNEL
	int
	zfs_znode_parent_and_name(znode_t zp, znode_t dzpp, char buf)
	{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	uint64_t parent;
	int is_xattrdir;
	int err;

	/* Extended attributes should not be visible as regular files. */
	if ((zp->z_pflags & ZFS_XATTR) != 0)
	return (SET_ERROR(EINVAL));

	err = zfs_obj_to_pobj(zfsvfs->z_os, zp->z_sa_hdl, zfsvfs->z_attr_table,
	&parent, &is_xattrdir);
	if (err != 0)
	return (err);
	ASSERT0(is_xattrdir);

	/* No name as this is a root object. */
	if (parent == zp->z_id)
	return (SET_ERROR(EINVAL));

	err = zap_value_search(zfsvfs->z_os, parent, zp->z_id,
	ZFS_DIRENT_OBJ(-1ULL), buf);
	if (err != 0)
	return (err);
	err = zfs_zget(zfsvfs, parent, dzpp);
	return (err);
	}
	#endif /* _KERNEL */
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zio_crypt.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zio_crypt.c
	index fb714d399296..aeb42b304e73 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zio_crypt.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zio_crypt.c
	@@ -1,1826 +1,1826 @@
	/*
	* CDDL HEADER START
	*
	* This file and its contents are supplied under the terms of the
	* Common Development and Distribution License ("CDDL"), version 1.0.
	* You may only use this file in accordance with the terms of version
	* 1.0 of the CDDL.
	*
	* A full copy of the text of the CDDL should have accompanied this
	* source. A copy of the CDDL is also available via the Internet at
	* http://www.illumos.org/license/CDDL.
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2017, Datto, Inc. All rights reserved.
	*/

	#include <sys/zio_crypt.h>
	#include <sys/dmu.h>
	#include <sys/dmu_objset.h>
	#include <sys/dnode.h>
	#include <sys/fs/zfs.h>
	#include <sys/zio.h>
	#include <sys/zil.h>
	#include <sys/sha2.h>
	#include <sys/hkdf.h>

	/*
	* This file is responsible for handling all of the details of generating
	* encryption parameters and performing encryption and authentication.
	*
	* BLOCK ENCRYPTION PARAMETERS:
	* Encryption /Authentication Algorithm Suite (crypt):
	* The encryption algorithm, mode, and key length we are going to use. We
	* currently support AES in either GCM or CCM modes with 128, 192, and 256 bit
	* keys. All authentication is currently done with SHA512-HMAC.
	*
	* Plaintext:
	* The unencrypted data that we want to encrypt.
	*
	* Initialization Vector (IV):
	* An initialization vector for the encryption algorithms. This is used to
	* "tweak" the encryption algorithms so that two blocks of the same data are
	* encrypted into different ciphertext outputs, thus obfuscating block patterns.
	* The supported encryption modes (AES-GCM and AES-CCM) require that an IV is
	* never reused with the same encryption key. This value is stored unencrypted
	* and must simply be provided to the decryption function. We use a 96 bit IV
	* (as recommended by NIST) for all block encryption. For non-dedup blocks we
	* derive the IV randomly. The first 64 bits of the IV are stored in the second
	* word of DVA[2] and the remaining 32 bits are stored in the upper 32 bits of
	* blk_fill. This is safe because encrypted blocks can't use the upper 32 bits
	* of blk_fill. We only encrypt level 0 blocks, which normally have a fill count
	* of 1. The only exception is for DMU_OT_DNODE objects, where the fill count of
	* level 0 blocks is the number of allocated dnodes in that block. The on-disk
	* format supports at most 2^15 slots per L0 dnode block, because the maximum
	* block size is 16MB (2^24). In either case, for level 0 blocks this number
	* will still be smaller than UINT32_MAX so it is safe to store the IV in the
	* top 32 bits of blk_fill, while leaving the bottom 32 bits of the fill count
	* for the dnode code.
	*
	* Master key:
	* This is the most important secret data of an encrypted dataset. It is used
	* along with the salt to generate that actual encryption keys via HKDF. We
	* do not use the master key to directly encrypt any data because there are
	* theoretical limits on how much data can actually be safely encrypted with
	* any encryption mode. The master key is stored encrypted on disk with the
	* user's wrapping key. Its length is determined by the encryption algorithm.
	* For details on how this is stored see the block comment in dsl_crypt.c
	*
	* Salt:
	* Used as an input to the HKDF function, along with the master key. We use a
	* 64 bit salt, stored unencrypted in the first word of DVA[2]. Any given salt
	* can be used for encrypting many blocks, so we cache the current salt and the
	* associated derived key in zio_crypt_t so we do not need to derive it again
	* needlessly.
	*
	* Encryption Key:
	* A secret binary key, generated from an HKDF function used to encrypt and
	* decrypt data.
	*
	* Message Authentication Code (MAC)
	* The MAC is an output of authenticated encryption modes such as AES-GCM and
	* AES-CCM. Its purpose is to ensure that an attacker cannot modify encrypted
	* data on disk and return garbage to the application. Effectively, it is a
	* checksum that can not be reproduced by an attacker. We store the MAC in the
	* second 128 bits of blk_cksum, leaving the first 128 bits for a truncated
	* regular checksum of the ciphertext which can be used for scrubbing.
	*
	* OBJECT AUTHENTICATION:
	* Some object types, such as DMU_OT_MASTER_NODE cannot be encrypted because
	* they contain some info that always needs to be readable. To prevent this
	* data from being altered, we authenticate this data using SHA512-HMAC. This
	* will produce a MAC (similar to the one produced via encryption) which can
	* be used to verify the object was not modified. HMACs do not require key
	* rotation or IVs, so we can keep up to the full 3 copies of authenticated
	* data.
	*
	* ZIL ENCRYPTION:
	* ZIL blocks have their bp written to disk ahead of the associated data, so we
	* cannot store the MAC there as we normally do. For these blocks the MAC is
	* stored in the embedded checksum within the zil_chain_t header. The salt and
	* IV are generated for the block on bp allocation instead of at encryption
	* time. In addition, ZIL blocks have some pieces that must be left in plaintext
	* for claiming even though all of the sensitive user data still needs to be
	* encrypted. The function zio_crypt_init_uios_zil() handles parsing which
	* pieces of the block need to be encrypted. All data that is not encrypted is
	* authenticated using the AAD mechanisms that the supported encryption modes
	* provide for. In order to preserve the semantics of the ZIL for encrypted
	* datasets, the ZIL is not protected at the objset level as described below.
	*
	* DNODE ENCRYPTION:
	* Similarly to ZIL blocks, the core part of each dnode_phys_t needs to be left
	* in plaintext for scrubbing and claiming, but the bonus buffers might contain
	* sensitive user data. The function zio_crypt_init_uios_dnode() handles parsing
	* which pieces of the block need to be encrypted. For more details about
	* dnode authentication and encryption, see zio_crypt_init_uios_dnode().
	*
	* OBJECT SET AUTHENTICATION:
	* Up to this point, everything we have encrypted and authenticated has been
	* at level 0 (or -2 for the ZIL). If we did not do any further work the
	* on-disk format would be susceptible to attacks that deleted or rearranged
	* the order of level 0 blocks. Ideally, the cleanest solution would be to
	* maintain a tree of authentication MACs going up the bp tree. However, this
	* presents a problem for raw sends. Send files do not send information about
	* indirect blocks so there would be no convenient way to transfer the MACs and
	* they cannot be recalculated on the receive side without the master key which
	* would defeat one of the purposes of raw sends in the first place. Instead,
	* for the indirect levels of the bp tree, we use a regular SHA512 of the MACs
	* from the level below. We also include some portable fields from blk_prop such
	* as the lsize and compression algorithm to prevent the data from being
	* misinterpreted.
	*
	* At the objset level, we maintain 2 separate 256 bit MACs in the
	* objset_phys_t. The first one is "portable" and is the logical root of the
	* MAC tree maintained in the metadnode's bps. The second, is "local" and is
	* used as the root MAC for the user accounting objects, which are also not
	* transferred via "zfs send". The portable MAC is sent in the DRR_BEGIN payload
	* of the send file. The useraccounting code ensures that the useraccounting
	* info is not present upon a receive, so the local MAC can simply be cleared
	* out at that time. For more info about objset_phys_t authentication, see
	* zio_crypt_do_objset_hmacs().
	*
	* CONSIDERATIONS FOR DEDUP:
	* In order for dedup to work, blocks that we want to dedup with one another
	* need to use the same IV and encryption key, so that they will have the same
	* ciphertext. Normally, one should never reuse an IV with the same encryption
	* key or else AES-GCM and AES-CCM can both actually leak the plaintext of both
	* blocks. In this case, however, since we are using the same plaintext as
	* well all that we end up with is a duplicate of the original ciphertext we
	* already had. As a result, an attacker with read access to the raw disk will
	* be able to tell which blocks are the same but this information is given away
	* by dedup anyway. In order to get the same IVs and encryption keys for
	* equivalent blocks of data we use an HMAC of the plaintext. We use an HMAC
	* here so that a reproducible checksum of the plaintext is never available to
	* the attacker. The HMAC key is kept alongside the master key, encrypted on
	* disk. The first 64 bits of the HMAC are used in place of the random salt, and
	* the next 96 bits are used as the IV. As a result of this mechanism, dedup
	* will only work within a clone family since encrypted dedup requires use of
	* the same master and HMAC keys.
	*/

	/*
	* After encrypting many blocks with the same key we may start to run up
	* against the theoretical limits of how much data can securely be encrypted
	* with a single key using the supported encryption modes. The most obvious
	* limitation is that our risk of generating 2 equivalent 96 bit IVs increases
	* the more IVs we generate (which both GCM and CCM modes strictly forbid).
	* This risk actually grows surprisingly quickly over time according to the
	* Birthday Problem. With a total IV space of 2^(96 bits), and assuming we have
	* generated n IVs with a cryptographically secure RNG, the approximate
	* probability p(n) of a collision is given as:
	*
	* p(n) ~= e^(-n(n-1)/(2(2^96)))
	*
	* [http://www.math.cornell.edu/~mec/2008-2009/TianyiZheng/Birthday.html]
	*
	* Assuming that we want to ensure that p(n) never goes over 1 / 1 trillion
	* we must not write more than 398,065,730 blocks with the same encryption key.
	* Therefore, we rotate our keys after 400,000,000 blocks have been written by
	* generating a new random 64 bit salt for our HKDF encryption key generation
	* function.
	*/
	#define ZFS_KEY_MAX_SALT_USES_DEFAULT 400000000
	#define ZFS_CURRENT_MAX_SALT_USES \
	(MIN(zfs_key_max_salt_uses, ZFS_KEY_MAX_SALT_USES_DEFAULT))
	unsigned long zfs_key_max_salt_uses = ZFS_KEY_MAX_SALT_USES_DEFAULT;

	/*
	* Set to a nonzero value to cause zio_do_crypt_uio() to fail 1/this many
	* calls, to test decryption error handling code paths.
	*/
	uint64_t zio_decrypt_fail_fraction = 0;

	typedef struct blkptr_auth_buf {
	uint64_t bab_prop; /* blk_prop - portable mask */
	uint8_t bab_mac[ZIO_DATA_MAC_LEN]; /* MAC from blk_cksum */
	uint64_t bab_pad; /* reserved for future use */
	} blkptr_auth_buf_t;

	zio_crypt_info_t zio_crypt_table[ZIO_CRYPT_FUNCTIONS] = {
	{"", ZC_TYPE_NONE, 0, "inherit"},
	{"", ZC_TYPE_NONE, 0, "on"},
	{"", ZC_TYPE_NONE, 0, "off"},
	{SUN_CKM_AES_CCM, ZC_TYPE_CCM, 16, "aes-128-ccm"},
	{SUN_CKM_AES_CCM, ZC_TYPE_CCM, 24, "aes-192-ccm"},
	{SUN_CKM_AES_CCM, ZC_TYPE_CCM, 32, "aes-256-ccm"},
	{SUN_CKM_AES_GCM, ZC_TYPE_GCM, 16, "aes-128-gcm"},
	{SUN_CKM_AES_GCM, ZC_TYPE_GCM, 24, "aes-192-gcm"},
	{SUN_CKM_AES_GCM, ZC_TYPE_GCM, 32, "aes-256-gcm"}
	};

	static void
	zio_crypt_key_destroy_early(zio_crypt_key_t *key)
	{
	rw_destroy(&key->zk_salt_lock);

	/* free crypto templates */
	bzero(&key->zk_session, sizeof (key->zk_session));

	/* zero out sensitive data */
	bzero(key, sizeof (zio_crypt_key_t));
	}

	void
	zio_crypt_key_destroy(zio_crypt_key_t *key)
	{

	freebsd_crypt_freesession(&key->zk_session);
	zio_crypt_key_destroy_early(key);
	}

	int
	zio_crypt_key_init(uint64_t crypt, zio_crypt_key_t *key)
	{
	int ret;
	crypto_mechanism_t mech __unused;
	uint_t keydata_len;
	zio_crypt_info_t *ci = NULL;

	- ASSERT(key != NULL);
	+ ASSERT3P(key, !=, NULL);
	ASSERT3U(crypt, <, ZIO_CRYPT_FUNCTIONS);

	ci = &zio_crypt_table[crypt];
	if (ci->ci_crypt_type != ZC_TYPE_GCM &&
	ci->ci_crypt_type != ZC_TYPE_CCM)
	return (ENOTSUP);

	keydata_len = zio_crypt_table[crypt].ci_keylen;
	bzero(key, sizeof (zio_crypt_key_t));
	rw_init(&key->zk_salt_lock, NULL, RW_DEFAULT, NULL);

	/* fill keydata buffers and salt with random data */
	ret = random_get_bytes((uint8_t *)&key->zk_guid, sizeof (uint64_t));
	if (ret != 0)
	goto error;

	ret = random_get_bytes(key->zk_master_keydata, keydata_len);
	if (ret != 0)
	goto error;

	ret = random_get_bytes(key->zk_hmac_keydata, SHA512_HMAC_KEYLEN);
	if (ret != 0)
	goto error;

	ret = random_get_bytes(key->zk_salt, ZIO_DATA_SALT_LEN);
	if (ret != 0)
	goto error;

	/* derive the current key from the master key */
	ret = hkdf_sha512(key->zk_master_keydata, keydata_len, NULL, 0,
	key->zk_salt, ZIO_DATA_SALT_LEN, key->zk_current_keydata,
	keydata_len);
	if (ret != 0)
	goto error;

	/* initialize keys for the ICP */
	key->zk_current_key.ck_format = CRYPTO_KEY_RAW;
	key->zk_current_key.ck_data = key->zk_current_keydata;
	key->zk_current_key.ck_length = CRYPTO_BYTES2BITS(keydata_len);

	key->zk_hmac_key.ck_format = CRYPTO_KEY_RAW;
	key->zk_hmac_key.ck_data = &key->zk_hmac_key;
	key->zk_hmac_key.ck_length = CRYPTO_BYTES2BITS(SHA512_HMAC_KEYLEN);

	ci = &zio_crypt_table[crypt];
	if (ci->ci_crypt_type != ZC_TYPE_GCM &&
	ci->ci_crypt_type != ZC_TYPE_CCM)
	return (ENOTSUP);

	ret = freebsd_crypt_newsession(&key->zk_session, ci,
	&key->zk_current_key);
	if (ret)
	goto error;

	key->zk_crypt = crypt;
	key->zk_version = ZIO_CRYPT_KEY_CURRENT_VERSION;
	key->zk_salt_count = 0;

	return (0);

	error:
	zio_crypt_key_destroy_early(key);
	return (ret);
	}

	static int
	zio_crypt_key_change_salt(zio_crypt_key_t *key)
	{
	int ret = 0;
	uint8_t salt[ZIO_DATA_SALT_LEN];
	crypto_mechanism_t mech __unused;

	uint_t keydata_len = zio_crypt_table[key->zk_crypt].ci_keylen;

	/* generate a new salt */
	ret = random_get_bytes(salt, ZIO_DATA_SALT_LEN);
	if (ret != 0)
	goto error;

	rw_enter(&key->zk_salt_lock, RW_WRITER);

	/* someone beat us to the salt rotation, just unlock and return */
	if (key->zk_salt_count < ZFS_CURRENT_MAX_SALT_USES)
	goto out_unlock;

	/* derive the current key from the master key and the new salt */
	ret = hkdf_sha512(key->zk_master_keydata, keydata_len, NULL, 0,
	salt, ZIO_DATA_SALT_LEN, key->zk_current_keydata, keydata_len);
	if (ret != 0)
	goto out_unlock;

	/* assign the salt and reset the usage count */
	bcopy(salt, key->zk_salt, ZIO_DATA_SALT_LEN);
	key->zk_salt_count = 0;

	freebsd_crypt_freesession(&key->zk_session);
	ret = freebsd_crypt_newsession(&key->zk_session,
	&zio_crypt_table[key->zk_crypt], &key->zk_current_key);
	if (ret != 0)
	goto out_unlock;

	rw_exit(&key->zk_salt_lock);

	return (0);

	out_unlock:
	rw_exit(&key->zk_salt_lock);
	error:
	return (ret);
	}

	/* See comment above zfs_key_max_salt_uses definition for details */
	int
	zio_crypt_key_get_salt(zio_crypt_key_t key, uint8_t salt)
	{
	int ret;
	boolean_t salt_change;

	rw_enter(&key->zk_salt_lock, RW_READER);

	bcopy(key->zk_salt, salt, ZIO_DATA_SALT_LEN);
	salt_change = (atomic_inc_64_nv(&key->zk_salt_count) >=
	ZFS_CURRENT_MAX_SALT_USES);

	rw_exit(&key->zk_salt_lock);

	if (salt_change) {
	ret = zio_crypt_key_change_salt(key);
	if (ret != 0)
	goto error;
	}

	return (0);

	error:
	return (ret);
	}

	void *failed_decrypt_buf;
	int failed_decrypt_size;

	/*
	* This function handles all encryption and decryption in zfs. When
	* encrypting it expects puio to reference the plaintext and cuio to
	* reference the ciphertext. cuio must have enough space for the
	* ciphertext + room for a MAC. datalen should be the length of the
	* plaintext / ciphertext alone.
	*/
	/*
	* The implementation for FreeBSD's OpenCrypto.
	*
	* The big difference between ICP and FOC is that FOC uses a single
	* buffer for input and output. This means that (for AES-GCM, the
	* only one supported right now) the source must be copied into the
	* destination, and the destination must have the AAD, and the tag/MAC,
	* already associated with it. (Both implementations can use a uio.)
	*
	* Since the auth data is part of the iovec array, all we need to know
	* is the length: 0 means there's no AAD.
	*
	*/
	static int
	zio_do_crypt_uio_opencrypto(boolean_t encrypt, freebsd_crypt_session_t *sess,
	uint64_t crypt, crypto_key_t key, uint8_t ivbuf, uint_t datalen,
	zfs_uio_t *uio, uint_t auth_len)
	{
	zio_crypt_info_t *ci;
	int ret;

	ci = &zio_crypt_table[crypt];
	if (ci->ci_crypt_type != ZC_TYPE_GCM &&
	ci->ci_crypt_type != ZC_TYPE_CCM)
	return (ENOTSUP);


	ret = freebsd_crypt_uio(encrypt, sess, ci, uio, key, ivbuf,
	datalen, auth_len);
	if (ret != 0) {
	#ifdef FCRYPTO_DEBUG
	printf("%s(%d): Returning error %s\n",
	__FUNCTION__, __LINE__, encrypt ? "EIO" : "ECKSUM");
	#endif
	ret = SET_ERROR(encrypt ? EIO : ECKSUM);
	}

	return (ret);
	}

	int
	zio_crypt_key_wrap(crypto_key_t cwkey, zio_crypt_key_t key, uint8_t *iv,
	uint8_t mac, uint8_t keydata_out, uint8_t *hmac_keydata_out)
	{
	int ret;
	uint64_t aad[3];
	/*
	* With OpenCrypto in FreeBSD, the same buffer is used for
	* input and output. Also, the AAD (for AES-GMC at least)
	* needs to logically go in front.
	*/
	zfs_uio_t cuio;
	struct uio cuio_s;
	iovec_t iovecs[4];
	uint64_t crypt = key->zk_crypt;
	uint_t enc_len, keydata_len, aad_len;

	ASSERT3U(crypt, <, ZIO_CRYPT_FUNCTIONS);
	ASSERT3U(cwkey->ck_format, ==, CRYPTO_KEY_RAW);

	zfs_uio_init(&cuio, &cuio_s);

	keydata_len = zio_crypt_table[crypt].ci_keylen;

	/* generate iv for wrapping the master and hmac key */
	ret = random_get_pseudo_bytes(iv, WRAPPING_IV_LEN);
	if (ret != 0)
	goto error;

	/*
	* Since we only support one buffer, we need to copy
	* the plain text (source) to the cipher buffer (dest).
	* We set iovecs[0] -- the authentication data -- below.
	*/
	bcopy((void*)key->zk_master_keydata, keydata_out, keydata_len);
	bcopy((void*)key->zk_hmac_keydata, hmac_keydata_out,
	SHA512_HMAC_KEYLEN);
	iovecs[1].iov_base = keydata_out;
	iovecs[1].iov_len = keydata_len;
	iovecs[2].iov_base = hmac_keydata_out;
	iovecs[2].iov_len = SHA512_HMAC_KEYLEN;
	iovecs[3].iov_base = mac;
	iovecs[3].iov_len = WRAPPING_MAC_LEN;

	/*
	* Although we don't support writing to the old format, we do
	* support rewrapping the key so that the user can move and
	* quarantine datasets on the old format.
	*/
	if (key->zk_version == 0) {
	aad_len = sizeof (uint64_t);
	aad[0] = LE_64(key->zk_guid);
	} else {
	ASSERT3U(key->zk_version, ==, ZIO_CRYPT_KEY_CURRENT_VERSION);
	aad_len = sizeof (uint64_t) * 3;
	aad[0] = LE_64(key->zk_guid);
	aad[1] = LE_64(crypt);
	aad[2] = LE_64(key->zk_version);
	}

	iovecs[0].iov_base = aad;
	iovecs[0].iov_len = aad_len;
	enc_len = zio_crypt_table[crypt].ci_keylen + SHA512_HMAC_KEYLEN;

	GET_UIO_STRUCT(&cuio)->uio_iov = iovecs;
	zfs_uio_iovcnt(&cuio) = 4;
	zfs_uio_segflg(&cuio) = UIO_SYSSPACE;

	/* encrypt the keys and store the resulting ciphertext and mac */
	ret = zio_do_crypt_uio_opencrypto(B_TRUE, NULL, crypt, cwkey,
	iv, enc_len, &cuio, aad_len);
	if (ret != 0)
	goto error;

	return (0);

	error:
	return (ret);
	}

	int
	zio_crypt_key_unwrap(crypto_key_t *cwkey, uint64_t crypt, uint64_t version,
	uint64_t guid, uint8_t keydata, uint8_t hmac_keydata, uint8_t *iv,
	uint8_t mac, zio_crypt_key_t key)
	{
	int ret;
	uint64_t aad[3];
	/*
	* With OpenCrypto in FreeBSD, the same buffer is used for
	* input and output. Also, the AAD (for AES-GMC at least)
	* needs to logically go in front.
	*/
	zfs_uio_t cuio;
	struct uio cuio_s;
	iovec_t iovecs[4];
	void src, dst;
	uint_t enc_len, keydata_len, aad_len;

	ASSERT3U(crypt, <, ZIO_CRYPT_FUNCTIONS);
	ASSERT3U(cwkey->ck_format, ==, CRYPTO_KEY_RAW);

	keydata_len = zio_crypt_table[crypt].ci_keylen;
	rw_init(&key->zk_salt_lock, NULL, RW_DEFAULT, NULL);

	zfs_uio_init(&cuio, &cuio_s);

	/*
	* Since we only support one buffer, we need to copy
	* the encrypted buffer (source) to the plain buffer
	* (dest). We set iovecs[0] -- the authentication data --
	* below.
	*/
	dst = key->zk_master_keydata;
	src = keydata;

	bcopy(src, dst, keydata_len);

	dst = key->zk_hmac_keydata;
	src = hmac_keydata;
	bcopy(src, dst, SHA512_HMAC_KEYLEN);

	iovecs[1].iov_base = key->zk_master_keydata;
	iovecs[1].iov_len = keydata_len;
	iovecs[2].iov_base = key->zk_hmac_keydata;
	iovecs[2].iov_len = SHA512_HMAC_KEYLEN;
	iovecs[3].iov_base = mac;
	iovecs[3].iov_len = WRAPPING_MAC_LEN;

	if (version == 0) {
	aad_len = sizeof (uint64_t);
	aad[0] = LE_64(guid);
	} else {
	ASSERT3U(version, ==, ZIO_CRYPT_KEY_CURRENT_VERSION);
	aad_len = sizeof (uint64_t) * 3;
	aad[0] = LE_64(guid);
	aad[1] = LE_64(crypt);
	aad[2] = LE_64(version);
	}

	enc_len = keydata_len + SHA512_HMAC_KEYLEN;
	iovecs[0].iov_base = aad;
	iovecs[0].iov_len = aad_len;

	GET_UIO_STRUCT(&cuio)->uio_iov = iovecs;
	zfs_uio_iovcnt(&cuio) = 4;
	zfs_uio_segflg(&cuio) = UIO_SYSSPACE;

	/* decrypt the keys and store the result in the output buffers */
	ret = zio_do_crypt_uio_opencrypto(B_FALSE, NULL, crypt, cwkey,
	iv, enc_len, &cuio, aad_len);

	if (ret != 0)
	goto error;

	/* generate a fresh salt */
	ret = random_get_bytes(key->zk_salt, ZIO_DATA_SALT_LEN);
	if (ret != 0)
	goto error;

	/* derive the current key from the master key */
	ret = hkdf_sha512(key->zk_master_keydata, keydata_len, NULL, 0,
	key->zk_salt, ZIO_DATA_SALT_LEN, key->zk_current_keydata,
	keydata_len);
	if (ret != 0)
	goto error;

	/* initialize keys for ICP */
	key->zk_current_key.ck_format = CRYPTO_KEY_RAW;
	key->zk_current_key.ck_data = key->zk_current_keydata;
	key->zk_current_key.ck_length = CRYPTO_BYTES2BITS(keydata_len);

	key->zk_hmac_key.ck_format = CRYPTO_KEY_RAW;
	key->zk_hmac_key.ck_data = key->zk_hmac_keydata;
	key->zk_hmac_key.ck_length = CRYPTO_BYTES2BITS(SHA512_HMAC_KEYLEN);

	ret = freebsd_crypt_newsession(&key->zk_session,
	&zio_crypt_table[crypt], &key->zk_current_key);
	if (ret != 0)
	goto error;

	key->zk_crypt = crypt;
	key->zk_version = version;
	key->zk_guid = guid;
	key->zk_salt_count = 0;

	return (0);

	error:
	zio_crypt_key_destroy_early(key);
	return (ret);
	}

	int
	zio_crypt_generate_iv(uint8_t *ivbuf)
	{
	int ret;

	/* randomly generate the IV */
	ret = random_get_pseudo_bytes(ivbuf, ZIO_DATA_IV_LEN);
	if (ret != 0)
	goto error;

	return (0);

	error:
	bzero(ivbuf, ZIO_DATA_IV_LEN);
	return (ret);
	}

	int
	zio_crypt_do_hmac(zio_crypt_key_t key, uint8_t data, uint_t datalen,
	uint8_t *digestbuf, uint_t digestlen)
	{
	uint8_t raw_digestbuf[SHA512_DIGEST_LENGTH];

	ASSERT3U(digestlen, <=, SHA512_DIGEST_LENGTH);

	crypto_mac(&key->zk_hmac_key, data, datalen,
	raw_digestbuf, SHA512_DIGEST_LENGTH);

	bcopy(raw_digestbuf, digestbuf, digestlen);

	return (0);
	}

	int
	zio_crypt_generate_iv_salt_dedup(zio_crypt_key_t key, uint8_t data,
	uint_t datalen, uint8_t ivbuf, uint8_t salt)
	{
	int ret;
	uint8_t digestbuf[SHA512_DIGEST_LENGTH];

	ret = zio_crypt_do_hmac(key, data, datalen,
	digestbuf, SHA512_DIGEST_LENGTH);
	if (ret != 0)
	return (ret);

	bcopy(digestbuf, salt, ZIO_DATA_SALT_LEN);
	bcopy(digestbuf + ZIO_DATA_SALT_LEN, ivbuf, ZIO_DATA_IV_LEN);

	return (0);
	}

	/*
	* The following functions are used to encode and decode encryption parameters
	* into blkptr_t and zil_header_t. The ICP wants to use these parameters as
	* byte strings, which normally means that these strings would not need to deal
	* with byteswapping at all. However, both blkptr_t and zil_header_t may be
	* byteswapped by lower layers and so we must "undo" that byteswap here upon
	* decoding and encoding in a non-native byteorder. These functions require
	* that the byteorder bit is correct before being called.
	*/
	void
	zio_crypt_encode_params_bp(blkptr_t bp, uint8_t salt, uint8_t *iv)
	{
	uint64_t val64;
	uint32_t val32;

	ASSERT(BP_IS_ENCRYPTED(bp));

	if (!BP_SHOULD_BYTESWAP(bp)) {
	bcopy(salt, &bp->blk_dva[2].dva_word[0], sizeof (uint64_t));
	bcopy(iv, &bp->blk_dva[2].dva_word[1], sizeof (uint64_t));
	bcopy(iv + sizeof (uint64_t), &val32, sizeof (uint32_t));
	BP_SET_IV2(bp, val32);
	} else {
	bcopy(salt, &val64, sizeof (uint64_t));
	bp->blk_dva[2].dva_word[0] = BSWAP_64(val64);

	bcopy(iv, &val64, sizeof (uint64_t));
	bp->blk_dva[2].dva_word[1] = BSWAP_64(val64);

	bcopy(iv + sizeof (uint64_t), &val32, sizeof (uint32_t));
	BP_SET_IV2(bp, BSWAP_32(val32));
	}
	}

	void
	zio_crypt_decode_params_bp(const blkptr_t bp, uint8_t salt, uint8_t *iv)
	{
	uint64_t val64;
	uint32_t val32;

	ASSERT(BP_IS_PROTECTED(bp));

	/* for convenience, so callers don't need to check */
	if (BP_IS_AUTHENTICATED(bp)) {
	bzero(salt, ZIO_DATA_SALT_LEN);
	bzero(iv, ZIO_DATA_IV_LEN);
	return;
	}

	if (!BP_SHOULD_BYTESWAP(bp)) {
	bcopy(&bp->blk_dva[2].dva_word[0], salt, sizeof (uint64_t));
	bcopy(&bp->blk_dva[2].dva_word[1], iv, sizeof (uint64_t));

	val32 = (uint32_t)BP_GET_IV2(bp);
	bcopy(&val32, iv + sizeof (uint64_t), sizeof (uint32_t));
	} else {
	val64 = BSWAP_64(bp->blk_dva[2].dva_word[0]);
	bcopy(&val64, salt, sizeof (uint64_t));

	val64 = BSWAP_64(bp->blk_dva[2].dva_word[1]);
	bcopy(&val64, iv, sizeof (uint64_t));

	val32 = BSWAP_32((uint32_t)BP_GET_IV2(bp));
	bcopy(&val32, iv + sizeof (uint64_t), sizeof (uint32_t));
	}
	}

	void
	zio_crypt_encode_mac_bp(blkptr_t bp, uint8_t mac)
	{
	uint64_t val64;

	ASSERT(BP_USES_CRYPT(bp));
	ASSERT3U(BP_GET_TYPE(bp), !=, DMU_OT_OBJSET);

	if (!BP_SHOULD_BYTESWAP(bp)) {
	bcopy(mac, &bp->blk_cksum.zc_word[2], sizeof (uint64_t));
	bcopy(mac + sizeof (uint64_t), &bp->blk_cksum.zc_word[3],
	sizeof (uint64_t));
	} else {
	bcopy(mac, &val64, sizeof (uint64_t));
	bp->blk_cksum.zc_word[2] = BSWAP_64(val64);

	bcopy(mac + sizeof (uint64_t), &val64, sizeof (uint64_t));
	bp->blk_cksum.zc_word[3] = BSWAP_64(val64);
	}
	}

	void
	zio_crypt_decode_mac_bp(const blkptr_t bp, uint8_t mac)
	{
	uint64_t val64;

	ASSERT(BP_USES_CRYPT(bp) \|\| BP_IS_HOLE(bp));

	/* for convenience, so callers don't need to check */
	if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
	bzero(mac, ZIO_DATA_MAC_LEN);
	return;
	}

	if (!BP_SHOULD_BYTESWAP(bp)) {
	bcopy(&bp->blk_cksum.zc_word[2], mac, sizeof (uint64_t));
	bcopy(&bp->blk_cksum.zc_word[3], mac + sizeof (uint64_t),
	sizeof (uint64_t));
	} else {
	val64 = BSWAP_64(bp->blk_cksum.zc_word[2]);
	bcopy(&val64, mac, sizeof (uint64_t));

	val64 = BSWAP_64(bp->blk_cksum.zc_word[3]);
	bcopy(&val64, mac + sizeof (uint64_t), sizeof (uint64_t));
	}
	}

	void
	zio_crypt_encode_mac_zil(void data, uint8_t mac)
	{
	zil_chain_t *zilc = data;

	bcopy(mac, &zilc->zc_eck.zec_cksum.zc_word[2], sizeof (uint64_t));
	bcopy(mac + sizeof (uint64_t), &zilc->zc_eck.zec_cksum.zc_word[3],
	sizeof (uint64_t));
	}

	void
	zio_crypt_decode_mac_zil(const void data, uint8_t mac)
	{
	/*
	* The ZIL MAC is embedded in the block it protects, which will
	* not have been byteswapped by the time this function has been called.
	* As a result, we don't need to worry about byteswapping the MAC.
	*/
	const zil_chain_t *zilc = data;

	bcopy(&zilc->zc_eck.zec_cksum.zc_word[2], mac, sizeof (uint64_t));
	bcopy(&zilc->zc_eck.zec_cksum.zc_word[3], mac + sizeof (uint64_t),
	sizeof (uint64_t));
	}

	/*
	* This routine takes a block of dnodes (src_abd) and copies only the bonus
	* buffers to the same offsets in the dst buffer. datalen should be the size
	* of both the src_abd and the dst buffer (not just the length of the bonus
	* buffers).
	*/
	void
	zio_crypt_copy_dnode_bonus(abd_t src_abd, uint8_t dst, uint_t datalen)
	{
	uint_t i, max_dnp = datalen >> DNODE_SHIFT;
	uint8_t *src;
	dnode_phys_t dnp, sdnp, *ddnp;

	src = abd_borrow_buf_copy(src_abd, datalen);

	sdnp = (dnode_phys_t *)src;
	ddnp = (dnode_phys_t *)dst;

	for (i = 0; i < max_dnp; i += sdnp[i].dn_extra_slots + 1) {
	dnp = &sdnp[i];
	if (dnp->dn_type != DMU_OT_NONE &&
	DMU_OT_IS_ENCRYPTED(dnp->dn_bonustype) &&
	dnp->dn_bonuslen != 0) {
	bcopy(DN_BONUS(dnp), DN_BONUS(&ddnp[i]),
	DN_MAX_BONUS_LEN(dnp));
	}
	}

	abd_return_buf(src_abd, src, datalen);
	}

	/*
	* This function decides what fields from blk_prop are included in
	* the on-disk various MAC algorithms.
	*/
	static void
	zio_crypt_bp_zero_nonportable_blkprop(blkptr_t *bp, uint64_t version)
	{
	int avoidlint = SPA_MINBLOCKSIZE;
	/*
	* Version 0 did not properly zero out all non-portable fields
	* as it should have done. We maintain this code so that we can
	* do read-only imports of pools on this version.
	*/
	if (version == 0) {
	BP_SET_DEDUP(bp, 0);
	BP_SET_CHECKSUM(bp, 0);
	BP_SET_PSIZE(bp, avoidlint);
	return;
	}

	ASSERT3U(version, ==, ZIO_CRYPT_KEY_CURRENT_VERSION);

	/*
	* The hole_birth feature might set these fields even if this bp
	* is a hole. We zero them out here to guarantee that raw sends
	* will function with or without the feature.
	*/
	if (BP_IS_HOLE(bp)) {
	bp->blk_prop = 0ULL;
	return;
	}

	/*
	* At L0 we want to verify these fields to ensure that data blocks
	* can not be reinterpreted. For instance, we do not want an attacker
	* to trick us into returning raw lz4 compressed data to the user
	* by modifying the compression bits. At higher levels, we cannot
	* enforce this policy since raw sends do not convey any information
	* about indirect blocks, so these values might be different on the
	* receive side. Fortunately, this does not open any new attack
	* vectors, since any alterations that can be made to a higher level
	* bp must still verify the correct order of the layer below it.
	*/
	if (BP_GET_LEVEL(bp) != 0) {
	BP_SET_BYTEORDER(bp, 0);
	BP_SET_COMPRESS(bp, 0);

	/*
	* psize cannot be set to zero or it will trigger
	* asserts, but the value doesn't really matter as
	* long as it is constant.
	*/
	BP_SET_PSIZE(bp, avoidlint);
	}

	BP_SET_DEDUP(bp, 0);
	BP_SET_CHECKSUM(bp, 0);
	}

	static void
	zio_crypt_bp_auth_init(uint64_t version, boolean_t should_bswap, blkptr_t *bp,
	blkptr_auth_buf_t bab, uint_t bab_len)
	{
	blkptr_t tmpbp = *bp;

	if (should_bswap)
	byteswap_uint64_array(&tmpbp, sizeof (blkptr_t));

	ASSERT(BP_USES_CRYPT(&tmpbp) \|\| BP_IS_HOLE(&tmpbp));
	ASSERT0(BP_IS_EMBEDDED(&tmpbp));

	zio_crypt_decode_mac_bp(&tmpbp, bab->bab_mac);

	/*
	* We always MAC blk_prop in LE to ensure portability. This
	* must be done after decoding the mac, since the endianness
	* will get zero'd out here.
	*/
	zio_crypt_bp_zero_nonportable_blkprop(&tmpbp, version);
	bab->bab_prop = LE_64(tmpbp.blk_prop);
	bab->bab_pad = 0ULL;

	/* version 0 did not include the padding */
	*bab_len = sizeof (blkptr_auth_buf_t);
	if (version == 0)
	*bab_len -= sizeof (uint64_t);
	}

	static int
	zio_crypt_bp_do_hmac_updates(crypto_context_t ctx, uint64_t version,
	boolean_t should_bswap, blkptr_t *bp)
	{
	uint_t bab_len;
	blkptr_auth_buf_t bab;

	zio_crypt_bp_auth_init(version, should_bswap, bp, &bab, &bab_len);
	crypto_mac_update(ctx, &bab, bab_len);

	return (0);
	}

	static void
	zio_crypt_bp_do_indrect_checksum_updates(SHA2_CTX *ctx, uint64_t version,
	boolean_t should_bswap, blkptr_t *bp)
	{
	uint_t bab_len;
	blkptr_auth_buf_t bab;

	zio_crypt_bp_auth_init(version, should_bswap, bp, &bab, &bab_len);
	SHA2Update(ctx, &bab, bab_len);
	}

	static void
	zio_crypt_bp_do_aad_updates(uint8_t *aadp, uint_t aad_len, uint64_t version,
	boolean_t should_bswap, blkptr_t *bp)
	{
	uint_t bab_len;
	blkptr_auth_buf_t bab;

	zio_crypt_bp_auth_init(version, should_bswap, bp, &bab, &bab_len);
	bcopy(&bab, *aadp, bab_len);
	*aadp += bab_len;
	*aad_len += bab_len;
	}

	static int
	zio_crypt_do_dnode_hmac_updates(crypto_context_t ctx, uint64_t version,
	boolean_t should_bswap, dnode_phys_t *dnp)
	{
	int ret, i;
	dnode_phys_t *adnp;
	boolean_t le_bswap = (should_bswap == ZFS_HOST_BYTEORDER);
	uint8_t tmp_dncore[offsetof(dnode_phys_t, dn_blkptr)];

	/* authenticate the core dnode (masking out non-portable bits) */
	bcopy(dnp, tmp_dncore, sizeof (tmp_dncore));
	adnp = (dnode_phys_t *)tmp_dncore;
	if (le_bswap) {
	adnp->dn_datablkszsec = BSWAP_16(adnp->dn_datablkszsec);
	adnp->dn_bonuslen = BSWAP_16(adnp->dn_bonuslen);
	adnp->dn_maxblkid = BSWAP_64(adnp->dn_maxblkid);
	adnp->dn_used = BSWAP_64(adnp->dn_used);
	}
	adnp->dn_flags &= DNODE_CRYPT_PORTABLE_FLAGS_MASK;
	adnp->dn_used = 0;

	crypto_mac_update(ctx, adnp, sizeof (tmp_dncore));

	for (i = 0; i < dnp->dn_nblkptr; i++) {
	ret = zio_crypt_bp_do_hmac_updates(ctx, version,
	should_bswap, &dnp->dn_blkptr[i]);
	if (ret != 0)
	goto error;
	}

	if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
	ret = zio_crypt_bp_do_hmac_updates(ctx, version,
	should_bswap, DN_SPILL_BLKPTR(dnp));
	if (ret != 0)
	goto error;
	}

	return (0);

	error:
	return (ret);
	}

	/*
	* objset_phys_t blocks introduce a number of exceptions to the normal
	* authentication process. objset_phys_t's contain 2 separate HMACS for
	* protecting the integrity of their data. The portable_mac protects the
	* metadnode. This MAC can be sent with a raw send and protects against
	* reordering of data within the metadnode. The local_mac protects the user
	* accounting objects which are not sent from one system to another.
	*
	* In addition, objset blocks are the only blocks that can be modified and
	* written to disk without the key loaded under certain circumstances. During
	* zil_claim() we need to be able to update the zil_header_t to complete
	* claiming log blocks and during raw receives we need to write out the
	* portable_mac from the send file. Both of these actions are possible
	* because these fields are not protected by either MAC so neither one will
	* need to modify the MACs without the key. However, when the modified blocks
	* are written out they will be byteswapped into the host machine's native
	* endianness which will modify fields protected by the MAC. As a result, MAC
	* calculation for objset blocks works slightly differently from other block
	* types. Where other block types MAC the data in whatever endianness is
	* written to disk, objset blocks always MAC little endian version of their
	* values. In the code, should_bswap is the value from BP_SHOULD_BYTESWAP()
	* and le_bswap indicates whether a byteswap is needed to get this block
	* into little endian format.
	*/
	/* ARGSUSED */
	int
	zio_crypt_do_objset_hmacs(zio_crypt_key_t key, void data, uint_t datalen,
	boolean_t should_bswap, uint8_t portable_mac, uint8_t local_mac)
	{
	int ret;
	struct hmac_ctx hash_ctx;
	struct hmac_ctx *ctx = &hash_ctx;
	objset_phys_t *osp = data;
	uint64_t intval;
	boolean_t le_bswap = (should_bswap == ZFS_HOST_BYTEORDER);
	uint8_t raw_portable_mac[SHA512_DIGEST_LENGTH];
	uint8_t raw_local_mac[SHA512_DIGEST_LENGTH];


	/* calculate the portable MAC from the portable fields and metadnode */
	crypto_mac_init(ctx, &key->zk_hmac_key);

	/* add in the os_type */
	intval = (le_bswap) ? osp->os_type : BSWAP_64(osp->os_type);
	crypto_mac_update(ctx, &intval, sizeof (uint64_t));

	/* add in the portable os_flags */
	intval = osp->os_flags;
	if (should_bswap)
	intval = BSWAP_64(intval);
	intval &= OBJSET_CRYPT_PORTABLE_FLAGS_MASK;
	/* CONSTCOND */
	if (!ZFS_HOST_BYTEORDER)
	intval = BSWAP_64(intval);

	crypto_mac_update(ctx, &intval, sizeof (uint64_t));

	/* add in fields from the metadnode */
	ret = zio_crypt_do_dnode_hmac_updates(ctx, key->zk_version,
	should_bswap, &osp->os_meta_dnode);
	if (ret)
	goto error;

	crypto_mac_final(ctx, raw_portable_mac, SHA512_DIGEST_LENGTH);

	bcopy(raw_portable_mac, portable_mac, ZIO_OBJSET_MAC_LEN);

	/*
	* The local MAC protects the user, group and project accounting.
	* If these objects are not present, the local MAC is zeroed out.
	*/
	if ((datalen >= OBJSET_PHYS_SIZE_V3 &&
	osp->os_userused_dnode.dn_type == DMU_OT_NONE &&
	osp->os_groupused_dnode.dn_type == DMU_OT_NONE &&
	osp->os_projectused_dnode.dn_type == DMU_OT_NONE) \|\|
	(datalen >= OBJSET_PHYS_SIZE_V2 &&
	osp->os_userused_dnode.dn_type == DMU_OT_NONE &&
	osp->os_groupused_dnode.dn_type == DMU_OT_NONE) \|\|
	(datalen <= OBJSET_PHYS_SIZE_V1)) {
	bzero(local_mac, ZIO_OBJSET_MAC_LEN);
	return (0);
	}

	/* calculate the local MAC from the userused and groupused dnodes */
	crypto_mac_init(ctx, &key->zk_hmac_key);

	/* add in the non-portable os_flags */
	intval = osp->os_flags;
	if (should_bswap)
	intval = BSWAP_64(intval);
	intval &= ~OBJSET_CRYPT_PORTABLE_FLAGS_MASK;
	/* CONSTCOND */
	if (!ZFS_HOST_BYTEORDER)
	intval = BSWAP_64(intval);

	crypto_mac_update(ctx, &intval, sizeof (uint64_t));

	/* XXX check dnode type ... */
	/* add in fields from the user accounting dnodes */
	if (osp->os_userused_dnode.dn_type != DMU_OT_NONE) {
	ret = zio_crypt_do_dnode_hmac_updates(ctx, key->zk_version,
	should_bswap, &osp->os_userused_dnode);
	if (ret)
	goto error;
	}

	if (osp->os_groupused_dnode.dn_type != DMU_OT_NONE) {
	ret = zio_crypt_do_dnode_hmac_updates(ctx, key->zk_version,
	should_bswap, &osp->os_groupused_dnode);
	if (ret)
	goto error;
	}

	if (osp->os_projectused_dnode.dn_type != DMU_OT_NONE &&
	datalen >= OBJSET_PHYS_SIZE_V3) {
	ret = zio_crypt_do_dnode_hmac_updates(ctx, key->zk_version,
	should_bswap, &osp->os_projectused_dnode);
	if (ret)
	goto error;
	}

	crypto_mac_final(ctx, raw_local_mac, SHA512_DIGEST_LENGTH);

	bcopy(raw_local_mac, local_mac, ZIO_OBJSET_MAC_LEN);

	return (0);

	error:
	bzero(portable_mac, ZIO_OBJSET_MAC_LEN);
	bzero(local_mac, ZIO_OBJSET_MAC_LEN);
	return (ret);
	}

	static void
	zio_crypt_destroy_uio(zfs_uio_t *uio)
	{
	if (GET_UIO_STRUCT(uio)->uio_iov)
	kmem_free(GET_UIO_STRUCT(uio)->uio_iov,
	zfs_uio_iovcnt(uio) * sizeof (iovec_t));
	}

	/*
	* This function parses an uncompressed indirect block and returns a checksum
	* of all the portable fields from all of the contained bps. The portable
	* fields are the MAC and all of the fields from blk_prop except for the dedup,
	* checksum, and psize bits. For an explanation of the purpose of this, see
	* the comment block on object set authentication.
	*/
	static int
	zio_crypt_do_indirect_mac_checksum_impl(boolean_t generate, void *buf,
	uint_t datalen, uint64_t version, boolean_t byteswap, uint8_t *cksum)
	{
	blkptr_t *bp;
	int i, epb = datalen >> SPA_BLKPTRSHIFT;
	SHA2_CTX ctx;
	uint8_t digestbuf[SHA512_DIGEST_LENGTH];

	/* checksum all of the MACs from the layer below */
	SHA2Init(SHA512, &ctx);
	for (i = 0, bp = buf; i < epb; i++, bp++) {
	zio_crypt_bp_do_indrect_checksum_updates(&ctx, version,
	byteswap, bp);
	}
	SHA2Final(digestbuf, &ctx);

	if (generate) {
	bcopy(digestbuf, cksum, ZIO_DATA_MAC_LEN);
	return (0);
	}

	if (bcmp(digestbuf, cksum, ZIO_DATA_MAC_LEN) != 0) {
	#ifdef FCRYPTO_DEBUG
	printf("%s(%d): Setting ECKSUM\n", __FUNCTION__, __LINE__);
	#endif
	return (SET_ERROR(ECKSUM));
	}
	return (0);
	}

	int
	zio_crypt_do_indirect_mac_checksum(boolean_t generate, void *buf,
	uint_t datalen, boolean_t byteswap, uint8_t *cksum)
	{
	int ret;

	/*
	* Unfortunately, callers of this function will not always have
	* easy access to the on-disk format version. This info is
	* normally found in the DSL Crypto Key, but the checksum-of-MACs
	* is expected to be verifiable even when the key isn't loaded.
	* Here, instead of doing a ZAP lookup for the version for each
	* zio, we simply try both existing formats.
	*/
	ret = zio_crypt_do_indirect_mac_checksum_impl(generate, buf,
	datalen, ZIO_CRYPT_KEY_CURRENT_VERSION, byteswap, cksum);
	if (ret == ECKSUM) {
	ASSERT(!generate);
	ret = zio_crypt_do_indirect_mac_checksum_impl(generate,
	buf, datalen, 0, byteswap, cksum);
	}

	return (ret);
	}

	int
	zio_crypt_do_indirect_mac_checksum_abd(boolean_t generate, abd_t *abd,
	uint_t datalen, boolean_t byteswap, uint8_t *cksum)
	{
	int ret;
	void *buf;

	buf = abd_borrow_buf_copy(abd, datalen);
	ret = zio_crypt_do_indirect_mac_checksum(generate, buf, datalen,
	byteswap, cksum);
	abd_return_buf(abd, buf, datalen);

	return (ret);
	}

	/*
	* Special case handling routine for encrypting / decrypting ZIL blocks.
	* We do not check for the older ZIL chain because the encryption feature
	* was not available before the newer ZIL chain was introduced. The goal
	* here is to encrypt everything except the blkptr_t of a lr_write_t and
	* the zil_chain_t header. Everything that is not encrypted is authenticated.
	*/
	/*
	* The OpenCrypto used in FreeBSD does not use separate source and
	* destination buffers; instead, the same buffer is used. Further, to
	* accommodate some of the drivers, the authbuf needs to be logically before
	* the data. This means that we need to copy the source to the destination,
	* and set up an extra iovec_t at the beginning to handle the authbuf.
	* It also means we'll only return one zfs_uio_t.
	*/

	/* ARGSUSED */
	static int
	zio_crypt_init_uios_zil(boolean_t encrypt, uint8_t *plainbuf,
	uint8_t cipherbuf, uint_t datalen, boolean_t byteswap, zfs_uio_t puio,
	zfs_uio_t out_uio, uint_t enc_len, uint8_t *authbuf, uint_t auth_len,
	boolean_t *no_crypt)
	{
	uint8_t *aadbuf = zio_buf_alloc(datalen);
	uint8_t src, dst, slrp, dlrp, blkend, aadp;
	iovec_t *dst_iovecs;
	zil_chain_t *zilc;
	lr_t *lr;
	uint64_t txtype, lr_len;
	uint_t crypt_len, nr_iovecs, vec;
	uint_t aad_len = 0, total_len = 0;

	if (encrypt) {
	src = plainbuf;
	dst = cipherbuf;
	} else {
	src = cipherbuf;
	dst = plainbuf;
	}
	bcopy(src, dst, datalen);

	/* Find the start and end record of the log block. */
	zilc = (zil_chain_t *)src;
	slrp = src + sizeof (zil_chain_t);
	aadp = aadbuf;
	blkend = src + ((byteswap) ? BSWAP_64(zilc->zc_nused) : zilc->zc_nused);

	/*
	* Calculate the number of encrypted iovecs we will need.
	*/

	/* We need at least two iovecs -- one for the AAD, one for the MAC. */
	nr_iovecs = 2;

	for (; slrp < blkend; slrp += lr_len) {
	lr = (lr_t *)slrp;

	if (byteswap) {
	txtype = BSWAP_64(lr->lrc_txtype);
	lr_len = BSWAP_64(lr->lrc_reclen);
	} else {
	txtype = lr->lrc_txtype;
	lr_len = lr->lrc_reclen;
	}

	nr_iovecs++;
	if (txtype == TX_WRITE && lr_len != sizeof (lr_write_t))
	nr_iovecs++;
	}

	dst_iovecs = kmem_alloc(nr_iovecs * sizeof (iovec_t), KM_SLEEP);

	/*
	* Copy the plain zil header over and authenticate everything except
	* the checksum that will store our MAC. If we are writing the data
	* the embedded checksum will not have been calculated yet, so we don't
	* authenticate that.
	*/
	bcopy(src, aadp, sizeof (zil_chain_t) - sizeof (zio_eck_t));
	aadp += sizeof (zil_chain_t) - sizeof (zio_eck_t);
	aad_len += sizeof (zil_chain_t) - sizeof (zio_eck_t);

	slrp = src + sizeof (zil_chain_t);
	dlrp = dst + sizeof (zil_chain_t);

	/*
	* Loop over records again, filling in iovecs.
	*/

	/* The first iovec will contain the authbuf. */
	vec = 1;

	for (; slrp < blkend; slrp += lr_len, dlrp += lr_len) {
	lr = (lr_t *)slrp;

	if (!byteswap) {
	txtype = lr->lrc_txtype;
	lr_len = lr->lrc_reclen;
	} else {
	txtype = BSWAP_64(lr->lrc_txtype);
	lr_len = BSWAP_64(lr->lrc_reclen);
	}

	/* copy the common lr_t */
	bcopy(slrp, dlrp, sizeof (lr_t));
	bcopy(slrp, aadp, sizeof (lr_t));
	aadp += sizeof (lr_t);
	aad_len += sizeof (lr_t);

	/*
	* If this is a TX_WRITE record we want to encrypt everything
	* except the bp if exists. If the bp does exist we want to
	* authenticate it.
	*/
	if (txtype == TX_WRITE) {
	crypt_len = sizeof (lr_write_t) -
	sizeof (lr_t) - sizeof (blkptr_t);
	dst_iovecs[vec].iov_base = (char *)dlrp +
	sizeof (lr_t);
	dst_iovecs[vec].iov_len = crypt_len;

	/* copy the bp now since it will not be encrypted */
	bcopy(slrp + sizeof (lr_write_t) - sizeof (blkptr_t),
	dlrp + sizeof (lr_write_t) - sizeof (blkptr_t),
	sizeof (blkptr_t));
	bcopy(slrp + sizeof (lr_write_t) - sizeof (blkptr_t),
	aadp, sizeof (blkptr_t));
	aadp += sizeof (blkptr_t);
	aad_len += sizeof (blkptr_t);
	vec++;
	total_len += crypt_len;

	if (lr_len != sizeof (lr_write_t)) {
	crypt_len = lr_len - sizeof (lr_write_t);
	dst_iovecs[vec].iov_base = (char *)
	dlrp + sizeof (lr_write_t);
	dst_iovecs[vec].iov_len = crypt_len;
	vec++;
	total_len += crypt_len;
	}
	} else {
	crypt_len = lr_len - sizeof (lr_t);
	dst_iovecs[vec].iov_base = (char *)dlrp +
	sizeof (lr_t);
	dst_iovecs[vec].iov_len = crypt_len;
	vec++;
	total_len += crypt_len;
	}
	}

	/* The last iovec will contain the MAC. */
	ASSERT3U(vec, ==, nr_iovecs - 1);

	/* AAD */
	dst_iovecs[0].iov_base = aadbuf;
	dst_iovecs[0].iov_len = aad_len;
	/* MAC */
	dst_iovecs[vec].iov_base = 0;
	dst_iovecs[vec].iov_len = 0;

	*no_crypt = (vec == 1);
	*enc_len = total_len;
	*authbuf = aadbuf;
	*auth_len = aad_len;
	GET_UIO_STRUCT(out_uio)->uio_iov = dst_iovecs;
	zfs_uio_iovcnt(out_uio) = nr_iovecs;

	return (0);
	}

	/*
	* Special case handling routine for encrypting / decrypting dnode blocks.
	*/
	static int
	zio_crypt_init_uios_dnode(boolean_t encrypt, uint64_t version,
	uint8_t plainbuf, uint8_t cipherbuf, uint_t datalen, boolean_t byteswap,
	zfs_uio_t puio, zfs_uio_t out_uio, uint_t enc_len, uint8_t *authbuf,
	uint_t auth_len, boolean_t no_crypt)
	{
	uint8_t *aadbuf = zio_buf_alloc(datalen);
	uint8_t src, dst, *aadp;
	dnode_phys_t dnp, adnp, sdnp, ddnp;
	iovec_t *dst_iovecs;
	uint_t nr_iovecs, crypt_len, vec;
	uint_t aad_len = 0, total_len = 0;
	uint_t i, j, max_dnp = datalen >> DNODE_SHIFT;

	if (encrypt) {
	src = plainbuf;
	dst = cipherbuf;
	} else {
	src = cipherbuf;
	dst = plainbuf;
	}
	bcopy(src, dst, datalen);

	sdnp = (dnode_phys_t *)src;
	ddnp = (dnode_phys_t *)dst;
	aadp = aadbuf;

	/*
	* Count the number of iovecs we will need to do the encryption by
	* counting the number of bonus buffers that need to be encrypted.
	*/

	/* We need at least two iovecs -- one for the AAD, one for the MAC. */
	nr_iovecs = 2;

	for (i = 0; i < max_dnp; i += sdnp[i].dn_extra_slots + 1) {
	/*
	* This block may still be byteswapped. However, all of the
	* values we use are either uint8_t's (for which byteswapping
	* is a noop) or a * != 0 check, which will work regardless
	* of whether or not we byteswap.
	*/
	if (sdnp[i].dn_type != DMU_OT_NONE &&
	DMU_OT_IS_ENCRYPTED(sdnp[i].dn_bonustype) &&
	sdnp[i].dn_bonuslen != 0) {
	nr_iovecs++;
	}
	}

	dst_iovecs = kmem_alloc(nr_iovecs * sizeof (iovec_t), KM_SLEEP);

	/*
	* Iterate through the dnodes again, this time filling in the uios
	* we allocated earlier. We also concatenate any data we want to
	* authenticate onto aadbuf.
	*/

	/* The first iovec will contain the authbuf. */
	vec = 1;

	for (i = 0; i < max_dnp; i += sdnp[i].dn_extra_slots + 1) {
	dnp = &sdnp[i];

	/* copy over the core fields and blkptrs (kept as plaintext) */
	bcopy(dnp, &ddnp[i], (uint8_t )DN_BONUS(dnp) - (uint8_t )dnp);

	if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
	bcopy(DN_SPILL_BLKPTR(dnp), DN_SPILL_BLKPTR(&ddnp[i]),
	sizeof (blkptr_t));
	}

	/*
	* Handle authenticated data. We authenticate everything in
	* the dnode that can be brought over when we do a raw send.
	* This includes all of the core fields as well as the MACs
	* stored in the bp checksums and all of the portable bits
	* from blk_prop. We include the dnode padding here in case it
	* ever gets used in the future. Some dn_flags and dn_used are
	* not portable so we mask those out values out of the
	* authenticated data.
	*/
	crypt_len = offsetof(dnode_phys_t, dn_blkptr);
	bcopy(dnp, aadp, crypt_len);
	adnp = (dnode_phys_t *)aadp;
	adnp->dn_flags &= DNODE_CRYPT_PORTABLE_FLAGS_MASK;
	adnp->dn_used = 0;
	aadp += crypt_len;
	aad_len += crypt_len;

	for (j = 0; j < dnp->dn_nblkptr; j++) {
	zio_crypt_bp_do_aad_updates(&aadp, &aad_len,
	version, byteswap, &dnp->dn_blkptr[j]);
	}

	if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
	zio_crypt_bp_do_aad_updates(&aadp, &aad_len,
	version, byteswap, DN_SPILL_BLKPTR(dnp));
	}

	/*
	* If this bonus buffer needs to be encrypted, we prepare an
	* iovec_t. The encryption / decryption functions will fill
	* this in for us with the encrypted or decrypted data.
	* Otherwise we add the bonus buffer to the authenticated
	* data buffer and copy it over to the destination. The
	* encrypted iovec extends to DN_MAX_BONUS_LEN(dnp) so that
	* we can guarantee alignment with the AES block size
	* (128 bits).
	*/
	crypt_len = DN_MAX_BONUS_LEN(dnp);
	if (dnp->dn_type != DMU_OT_NONE &&
	DMU_OT_IS_ENCRYPTED(dnp->dn_bonustype) &&
	dnp->dn_bonuslen != 0) {
	dst_iovecs[vec].iov_base = DN_BONUS(&ddnp[i]);
	dst_iovecs[vec].iov_len = crypt_len;

	vec++;
	total_len += crypt_len;
	} else {
	bcopy(DN_BONUS(dnp), DN_BONUS(&ddnp[i]), crypt_len);
	bcopy(DN_BONUS(dnp), aadp, crypt_len);
	aadp += crypt_len;
	aad_len += crypt_len;
	}
	}

	/* The last iovec will contain the MAC. */
	ASSERT3U(vec, ==, nr_iovecs - 1);

	/* AAD */
	dst_iovecs[0].iov_base = aadbuf;
	dst_iovecs[0].iov_len = aad_len;
	/* MAC */
	dst_iovecs[vec].iov_base = 0;
	dst_iovecs[vec].iov_len = 0;

	*no_crypt = (vec == 1);
	*enc_len = total_len;
	*authbuf = aadbuf;
	*auth_len = aad_len;
	GET_UIO_STRUCT(out_uio)->uio_iov = dst_iovecs;
	zfs_uio_iovcnt(out_uio) = nr_iovecs;

	return (0);
	}

	/* ARGSUSED */
	static int
	zio_crypt_init_uios_normal(boolean_t encrypt, uint8_t *plainbuf,
	uint8_t cipherbuf, uint_t datalen, zfs_uio_t puio, zfs_uio_t *out_uio,
	uint_t *enc_len)
	{
	int ret;
	uint_t nr_plain = 1, nr_cipher = 2;
	iovec_t plain_iovecs = NULL, cipher_iovecs = NULL;
	void src, dst;

	cipher_iovecs = kmem_alloc(nr_cipher * sizeof (iovec_t),
	KM_SLEEP);
	if (!cipher_iovecs) {
	ret = SET_ERROR(ENOMEM);
	goto error;
	}
	bzero(cipher_iovecs, nr_cipher * sizeof (iovec_t));

	if (encrypt) {
	src = plainbuf;
	dst = cipherbuf;
	} else {
	src = cipherbuf;
	dst = plainbuf;
	}
	bcopy(src, dst, datalen);
	cipher_iovecs[0].iov_base = dst;
	cipher_iovecs[0].iov_len = datalen;

	*enc_len = datalen;
	GET_UIO_STRUCT(out_uio)->uio_iov = cipher_iovecs;
	zfs_uio_iovcnt(out_uio) = nr_cipher;

	return (0);

	error:
	if (plain_iovecs != NULL)
	kmem_free(plain_iovecs, nr_plain * sizeof (iovec_t));
	if (cipher_iovecs != NULL)
	kmem_free(cipher_iovecs, nr_cipher * sizeof (iovec_t));

	*enc_len = 0;
	GET_UIO_STRUCT(out_uio)->uio_iov = NULL;
	zfs_uio_iovcnt(out_uio) = 0;

	return (ret);
	}

	/*
	* This function builds up the plaintext (puio) and ciphertext (cuio) uios so
	* that they can be used for encryption and decryption by zio_do_crypt_uio().
	* Most blocks will use zio_crypt_init_uios_normal(), with ZIL and dnode blocks
	* requiring special handling to parse out pieces that are to be encrypted. The
	* authbuf is used by these special cases to store additional authenticated
	* data (AAD) for the encryption modes.
	*/
	static int
	zio_crypt_init_uios(boolean_t encrypt, uint64_t version, dmu_object_type_t ot,
	uint8_t plainbuf, uint8_t cipherbuf, uint_t datalen, boolean_t byteswap,
	uint8_t mac, zfs_uio_t puio, zfs_uio_t cuio, uint_t enc_len,
	uint8_t *authbuf, uint_t auth_len, boolean_t *no_crypt)
	{
	int ret;
	iovec_t *mac_iov;

	ASSERT(DMU_OT_IS_ENCRYPTED(ot) \|\| ot == DMU_OT_NONE);

	/* route to handler */
	switch (ot) {
	case DMU_OT_INTENT_LOG:
	ret = zio_crypt_init_uios_zil(encrypt, plainbuf, cipherbuf,
	datalen, byteswap, puio, cuio, enc_len, authbuf, auth_len,
	no_crypt);
	break;
	case DMU_OT_DNODE:
	ret = zio_crypt_init_uios_dnode(encrypt, version, plainbuf,
	cipherbuf, datalen, byteswap, puio, cuio, enc_len, authbuf,
	auth_len, no_crypt);
	break;
	default:
	ret = zio_crypt_init_uios_normal(encrypt, plainbuf, cipherbuf,
	datalen, puio, cuio, enc_len);
	*authbuf = NULL;
	*auth_len = 0;
	*no_crypt = B_FALSE;
	break;
	}

	if (ret != 0)
	goto error;

	/* populate the uios */
	zfs_uio_segflg(cuio) = UIO_SYSSPACE;

	mac_iov =
	((iovec_t *)&(GET_UIO_STRUCT(cuio)->
	uio_iov[zfs_uio_iovcnt(cuio) - 1]));
	mac_iov->iov_base = (void *)mac;
	mac_iov->iov_len = ZIO_DATA_MAC_LEN;

	return (0);

	error:
	return (ret);
	}

	void *failed_decrypt_buf;
	int faile_decrypt_size;

	/*
	* Primary encryption / decryption entrypoint for zio data.
	*/
	int
	zio_do_crypt_data(boolean_t encrypt, zio_crypt_key_t *key,
	dmu_object_type_t ot, boolean_t byteswap, uint8_t salt, uint8_t iv,
	uint8_t mac, uint_t datalen, uint8_t plainbuf, uint8_t *cipherbuf,
	boolean_t *no_crypt)
	{
	int ret;
	boolean_t locked = B_FALSE;
	uint64_t crypt = key->zk_crypt;
	uint_t keydata_len = zio_crypt_table[crypt].ci_keylen;
	uint_t enc_len, auth_len;
	zfs_uio_t puio, cuio;
	struct uio puio_s, cuio_s;
	uint8_t enc_keydata[MASTER_KEY_MAX_LEN];
	crypto_key_t tmp_ckey, *ckey = NULL;
	freebsd_crypt_session_t *tmpl = NULL;
	uint8_t *authbuf = NULL;


	zfs_uio_init(&puio, &puio_s);
	zfs_uio_init(&cuio, &cuio_s);
	bzero(GET_UIO_STRUCT(&puio), sizeof (struct uio));
	bzero(GET_UIO_STRUCT(&cuio), sizeof (struct uio));

	#ifdef FCRYPTO_DEBUG
	printf("%s(%s, %p, %p, %d, %p, %p, %u, %s, %p, %p, %p)\n",
	__FUNCTION__,
	encrypt ? "encrypt" : "decrypt",
	key, salt, ot, iv, mac, datalen,
	byteswap ? "byteswap" : "native_endian", plainbuf,
	cipherbuf, no_crypt);

	printf("\tkey = {");
	for (int i = 0; i < key->zk_current_key.ck_length/8; i++)
	printf("%02x ", ((uint8_t *)key->zk_current_key.ck_data)[i]);
	printf("}\n");
	#endif
	/* create uios for encryption */
	ret = zio_crypt_init_uios(encrypt, key->zk_version, ot, plainbuf,
	cipherbuf, datalen, byteswap, mac, &puio, &cuio, &enc_len,
	&authbuf, &auth_len, no_crypt);
	if (ret != 0)
	return (ret);

	/*
	* If the needed key is the current one, just use it. Otherwise we
	* need to generate a temporary one from the given salt + master key.
	* If we are encrypting, we must return a copy of the current salt
	* so that it can be stored in the blkptr_t.
	*/
	rw_enter(&key->zk_salt_lock, RW_READER);
	locked = B_TRUE;

	if (bcmp(salt, key->zk_salt, ZIO_DATA_SALT_LEN) == 0) {
	ckey = &key->zk_current_key;
	tmpl = &key->zk_session;
	} else {
	rw_exit(&key->zk_salt_lock);
	locked = B_FALSE;

	ret = hkdf_sha512(key->zk_master_keydata, keydata_len, NULL, 0,
	salt, ZIO_DATA_SALT_LEN, enc_keydata, keydata_len);
	if (ret != 0)
	goto error;
	tmp_ckey.ck_format = CRYPTO_KEY_RAW;
	tmp_ckey.ck_data = enc_keydata;
	tmp_ckey.ck_length = CRYPTO_BYTES2BITS(keydata_len);

	ckey = &tmp_ckey;
	tmpl = NULL;
	}

	/* perform the encryption / decryption */
	ret = zio_do_crypt_uio_opencrypto(encrypt, tmpl, key->zk_crypt,
	ckey, iv, enc_len, &cuio, auth_len);
	if (ret != 0)
	goto error;
	if (locked) {
	rw_exit(&key->zk_salt_lock);
	locked = B_FALSE;
	}

	if (authbuf != NULL)
	zio_buf_free(authbuf, datalen);
	if (ckey == &tmp_ckey)
	bzero(enc_keydata, keydata_len);
	zio_crypt_destroy_uio(&puio);
	zio_crypt_destroy_uio(&cuio);

	return (0);

	error:
	if (!encrypt) {
	if (failed_decrypt_buf != NULL)
	kmem_free(failed_decrypt_buf, failed_decrypt_size);
	failed_decrypt_buf = kmem_alloc(datalen, KM_SLEEP);
	failed_decrypt_size = datalen;
	bcopy(cipherbuf, failed_decrypt_buf, datalen);
	}
	if (locked)
	rw_exit(&key->zk_salt_lock);
	if (authbuf != NULL)
	zio_buf_free(authbuf, datalen);
	if (ckey == &tmp_ckey)
	bzero(enc_keydata, keydata_len);
	zio_crypt_destroy_uio(&puio);
	zio_crypt_destroy_uio(&cuio);
	return (SET_ERROR(ret));
	}

	/*
	* Simple wrapper around zio_do_crypt_data() to work with abd's instead of
	* linear buffers.
	*/
	int
	zio_do_crypt_abd(boolean_t encrypt, zio_crypt_key_t *key, dmu_object_type_t ot,
	boolean_t byteswap, uint8_t salt, uint8_t iv, uint8_t *mac,
	uint_t datalen, abd_t pabd, abd_t cabd, boolean_t *no_crypt)
	{
	int ret;
	void ptmp, ctmp;

	if (encrypt) {
	ptmp = abd_borrow_buf_copy(pabd, datalen);
	ctmp = abd_borrow_buf(cabd, datalen);
	} else {
	ptmp = abd_borrow_buf(pabd, datalen);
	ctmp = abd_borrow_buf_copy(cabd, datalen);
	}

	ret = zio_do_crypt_data(encrypt, key, ot, byteswap, salt, iv, mac,
	datalen, ptmp, ctmp, no_crypt);
	if (ret != 0)
	goto error;

	if (encrypt) {
	abd_return_buf(pabd, ptmp, datalen);
	abd_return_buf_copy(cabd, ctmp, datalen);
	} else {
	abd_return_buf_copy(pabd, ptmp, datalen);
	abd_return_buf(cabd, ctmp, datalen);
	}

	return (0);

	error:
	if (encrypt) {
	abd_return_buf(pabd, ptmp, datalen);
	abd_return_buf_copy(cabd, ctmp, datalen);
	} else {
	abd_return_buf_copy(pabd, ptmp, datalen);
	abd_return_buf(cabd, ctmp, datalen);
	}

	return (SET_ERROR(ret));
	}

	#if defined(_KERNEL) && defined(HAVE_SPL)
	/* BEGIN CSTYLED */
	module_param(zfs_key_max_salt_uses, ulong, 0644);
	MODULE_PARM_DESC(zfs_key_max_salt_uses, "Max number of times a salt value "
	"can be used for generating encryption keys before it is rotated");
	/* END CSTYLED */
	#endif
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zvol_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zvol_os.c
	index 4d889962be2e..450369192569 100644
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zvol_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zvol_os.c
	@@ -1,1538 +1,1543 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	*
	* Copyright (c) 2006-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
	* All rights reserved.
	*
	* Portions Copyright 2010 Robert Milkowski
	*
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2012, 2017 by Delphix. All rights reserved.
	* Copyright (c) 2013, Joyent, Inc. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	*/

	/* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */

	/*
	* ZFS volume emulation driver.
	*
	* Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
	* Volumes are accessed through the symbolic links named:
	*
	* /dev/zvol/<pool_name>/<dataset_name>
	*
	* Volumes are persistent through reboot. No user command needs to be
	* run before opening and using a device.
	*
	* On FreeBSD ZVOLs are simply GEOM providers like any other storage device
	* in the system. Except when they're simply character devices (volmode=dev).
	*/

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/kernel.h>
	#include <sys/errno.h>
	#include <sys/uio.h>
	#include <sys/bio.h>
	#include <sys/buf.h>
	#include <sys/kmem.h>
	#include <sys/conf.h>
	#include <sys/cmn_err.h>
	#include <sys/stat.h>
	#include <sys/proc.h>
	#include <sys/zap.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/zio.h>
	#include <sys/disk.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dnode.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_dir.h>
	#include <sys/byteorder.h>
	#include <sys/sunddi.h>
	#include <sys/dirent.h>
	#include <sys/policy.h>
	#include <sys/queue.h>
	#include <sys/fs/zfs.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zil.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_rlock.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_raidz.h>
	#include <sys/zvol.h>
	#include <sys/zil_impl.h>
	#include <sys/dataset_kstats.h>
	#include <sys/dbuf.h>
	#include <sys/dmu_tx.h>
	#include <sys/zfeature.h>
	#include <sys/zio_checksum.h>
	#include <sys/zil_impl.h>
	#include <sys/filio.h>

	#include <geom/geom.h>
	#include <sys/zvol.h>
	#include <sys/zvol_impl.h>

	#include "zfs_namecheck.h"

	#define ZVOL_DUMPSIZE "dumpsize"

	#ifdef ZVOL_LOCK_DEBUG
	#define ZVOL_RW_READER RW_WRITER
	#define ZVOL_RW_READ_HELD RW_WRITE_HELD
	#else
	#define ZVOL_RW_READER RW_READER
	#define ZVOL_RW_READ_HELD RW_READ_HELD
	#endif

	enum zvol_geom_state {
	ZVOL_GEOM_UNINIT,
	ZVOL_GEOM_STOPPED,
	ZVOL_GEOM_RUNNING,
	};

	struct zvol_state_os {
	#define zso_dev _zso_state._zso_dev
	#define zso_geom _zso_state._zso_geom
	union {
	/* volmode=dev */
	struct zvol_state_dev {
	struct cdev *zsd_cdev;
	uint64_t zsd_sync_cnt;
	} _zso_dev;

	/* volmode=geom */
	struct zvol_state_geom {
	struct g_provider *zsg_provider;
	struct bio_queue_head zsg_queue;
	struct mtx zsg_queue_mtx;
	enum zvol_geom_state zsg_state;
	} _zso_geom;
	} _zso_state;
	int zso_dying;
	};

	static uint32_t zvol_minors;

	SYSCTL_DECL(_vfs_zfs);
	SYSCTL_NODE(_vfs_zfs, OID_AUTO, vol, CTLFLAG_RW, 0, "ZFS VOLUME");
	SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, mode, CTLFLAG_RWTUN, &zvol_volmode, 0,
	"Expose as GEOM providers (1), device files (2) or neither");
	static boolean_t zpool_on_zvol = B_FALSE;
	SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, recursive, CTLFLAG_RWTUN, &zpool_on_zvol, 0,
	"Allow zpools to use zvols as vdevs (DANGEROUS)");

	/*
	* Toggle unmap functionality.
	*/
	boolean_t zvol_unmap_enabled = B_TRUE;

	SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_enabled, CTLFLAG_RWTUN,
	&zvol_unmap_enabled, 0, "Enable UNMAP functionality");

	/*
	* zvol maximum transfer in one DMU tx.
	*/
	int zvol_maxphys = DMU_MAX_ACCESS / 2;

	static void zvol_ensure_zilog(zvol_state_t *zv);

	static d_open_t zvol_cdev_open;
	static d_close_t zvol_cdev_close;
	static d_ioctl_t zvol_cdev_ioctl;
	static d_read_t zvol_cdev_read;
	static d_write_t zvol_cdev_write;
	static d_strategy_t zvol_geom_bio_strategy;

	static struct cdevsw zvol_cdevsw = {
	.d_name = "zvol",
	.d_version = D_VERSION,
	.d_flags = D_DISK \| D_TRACKCLOSE,
	.d_open = zvol_cdev_open,
	.d_close = zvol_cdev_close,
	.d_ioctl = zvol_cdev_ioctl,
	.d_read = zvol_cdev_read,
	.d_write = zvol_cdev_write,
	.d_strategy = zvol_geom_bio_strategy,
	};

	extern uint_t zfs_geom_probe_vdev_key;

	struct g_class zfs_zvol_class = {
	.name = "ZFS::ZVOL",
	.version = G_VERSION,
	};

	DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol);

	static int zvol_geom_open(struct g_provider *pp, int flag, int count);
	static int zvol_geom_close(struct g_provider *pp, int flag, int count);
	static void zvol_geom_run(zvol_state_t *zv);
	static void zvol_geom_destroy(zvol_state_t *zv);
	static int zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace);
	static void zvol_geom_worker(void *arg);
	static void zvol_geom_bio_start(struct bio *bp);
	static int zvol_geom_bio_getattr(struct bio *bp);
	/* static d_strategy_t zvol_geom_bio_strategy; (declared elsewhere) */

	/*
	* GEOM mode implementation
	*/

	/ARGSUSED/
	static int
	zvol_geom_open(struct g_provider *pp, int flag, int count)
	{
	zvol_state_t *zv;
	int err = 0;
	boolean_t drop_suspend = B_FALSE;
	boolean_t drop_namespace = B_FALSE;

	if (!zpool_on_zvol && tsd_get(zfs_geom_probe_vdev_key) != NULL) {
	/*
	* if zfs_geom_probe_vdev_key is set, that means that zfs is
	* attempting to probe geom providers while looking for a
	* replacement for a missing VDEV. In this case, the
	* spa_namespace_lock will not be held, but it is still illegal
	* to use a zvol as a vdev. Deadlocks can result if another
	* thread has spa_namespace_lock
	*/
	return (SET_ERROR(EOPNOTSUPP));
	}

	retry:
	rw_enter(&zvol_state_lock, ZVOL_RW_READER);
	zv = pp->private;
	if (zv == NULL) {
	rw_exit(&zvol_state_lock);
	err = SET_ERROR(ENXIO);
	goto out_locked;
	}

	if (zv->zv_open_count == 0 && !mutex_owned(&spa_namespace_lock)) {
	/*
	* We need to guarantee that the namespace lock is held
	* to avoid spurious failures in zvol_first_open.
	*/
	drop_namespace = B_TRUE;
	if (!mutex_tryenter(&spa_namespace_lock)) {
	rw_exit(&zvol_state_lock);
	mutex_enter(&spa_namespace_lock);
	goto retry;
	}
	}
	mutex_enter(&zv->zv_state_lock);
	if (zv->zv_zso->zso_dying) {
	rw_exit(&zvol_state_lock);
	err = SET_ERROR(ENXIO);
	goto out_zv_locked;
	}
	ASSERT3S(zv->zv_volmode, ==, ZFS_VOLMODE_GEOM);

	/*
	* make sure zvol is not suspended during first open
	* (hold zv_suspend_lock) and respect proper lock acquisition
	* ordering - zv_suspend_lock before zv_state_lock
	*/
	if (zv->zv_open_count == 0) {
	drop_suspend = B_TRUE;
	if (!rw_tryenter(&zv->zv_suspend_lock, ZVOL_RW_READER)) {
	mutex_exit(&zv->zv_state_lock);
	rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);
	mutex_enter(&zv->zv_state_lock);
	/* check to see if zv_suspend_lock is needed */
	if (zv->zv_open_count != 0) {
	rw_exit(&zv->zv_suspend_lock);
	drop_suspend = B_FALSE;
	}
	}
	}
	rw_exit(&zvol_state_lock);

	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	if (zv->zv_open_count == 0) {
	ASSERT(ZVOL_RW_READ_HELD(&zv->zv_suspend_lock));
	err = zvol_first_open(zv, !(flag & FWRITE));
	if (err)
	goto out_zv_locked;
	pp->mediasize = zv->zv_volsize;
	pp->stripeoffset = 0;
	pp->stripesize = zv->zv_volblocksize;
	}

	/*
	* Check for a bad on-disk format version now since we
	* lied about owning the dataset readonly before.
	*/
	if ((flag & FWRITE) && ((zv->zv_flags & ZVOL_RDONLY) \|\|
	dmu_objset_incompatible_encryption_version(zv->zv_objset))) {
	err = SET_ERROR(EROFS);
	goto out_opened;
	}
	if (zv->zv_flags & ZVOL_EXCL) {
	err = SET_ERROR(EBUSY);
	goto out_opened;
	}
	#ifdef FEXCL
	if (flag & FEXCL) {
	if (zv->zv_open_count != 0) {
	err = SET_ERROR(EBUSY);
	goto out_opened;
	}
	zv->zv_flags \|= ZVOL_EXCL;
	}
	#endif

	zv->zv_open_count += count;
	out_opened:
	if (zv->zv_open_count == 0) {
	zvol_last_close(zv);
	wakeup(zv);
	}
	out_zv_locked:
	mutex_exit(&zv->zv_state_lock);
	out_locked:
	if (drop_namespace)
	mutex_exit(&spa_namespace_lock);
	if (drop_suspend)
	rw_exit(&zv->zv_suspend_lock);
	return (err);
	}

	/ARGSUSED/
	static int
	zvol_geom_close(struct g_provider *pp, int flag, int count)
	{
	zvol_state_t *zv;
	boolean_t drop_suspend = B_TRUE;
	int new_open_count;

	rw_enter(&zvol_state_lock, ZVOL_RW_READER);
	zv = pp->private;
	if (zv == NULL) {
	rw_exit(&zvol_state_lock);
	return (SET_ERROR(ENXIO));
	}

	mutex_enter(&zv->zv_state_lock);
	if (zv->zv_flags & ZVOL_EXCL) {
	ASSERT3U(zv->zv_open_count, ==, 1);
	zv->zv_flags &= ~ZVOL_EXCL;
	}

	ASSERT3S(zv->zv_volmode, ==, ZFS_VOLMODE_GEOM);

	/*
	* If the open count is zero, this is a spurious close.
	* That indicates a bug in the kernel / DDI framework.
	*/
	ASSERT3U(zv->zv_open_count, >, 0);

	/*
	* make sure zvol is not suspended during last close
	* (hold zv_suspend_lock) and respect proper lock acquisition
	* ordering - zv_suspend_lock before zv_state_lock
	*/
	new_open_count = zv->zv_open_count - count;
	if (new_open_count == 0) {
	if (!rw_tryenter(&zv->zv_suspend_lock, ZVOL_RW_READER)) {
	mutex_exit(&zv->zv_state_lock);
	rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);
	mutex_enter(&zv->zv_state_lock);
	/* check to see if zv_suspend_lock is needed */
	new_open_count = zv->zv_open_count - count;
	if (new_open_count != 0) {
	rw_exit(&zv->zv_suspend_lock);
	drop_suspend = B_FALSE;
	}
	}
	} else {
	drop_suspend = B_FALSE;
	}
	rw_exit(&zvol_state_lock);

	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	/*
	* You may get multiple opens, but only one close.
	*/
	zv->zv_open_count = new_open_count;
	if (zv->zv_open_count == 0) {
	ASSERT(ZVOL_RW_READ_HELD(&zv->zv_suspend_lock));
	zvol_last_close(zv);
	wakeup(zv);
	}

	mutex_exit(&zv->zv_state_lock);

	if (drop_suspend)
	rw_exit(&zv->zv_suspend_lock);
	return (0);
	}

	static void
	zvol_geom_run(zvol_state_t *zv)
	{
	struct zvol_state_geom *zsg = &zv->zv_zso->zso_geom;
	struct g_provider *pp = zsg->zsg_provider;

	ASSERT3S(zv->zv_volmode, ==, ZFS_VOLMODE_GEOM);

	g_error_provider(pp, 0);

	kproc_kthread_add(zvol_geom_worker, zv, &system_proc, NULL, 0, 0,
	"zfskern", "zvol %s", pp->name + sizeof (ZVOL_DRIVER));
	}

	static void
	zvol_geom_destroy(zvol_state_t *zv)
	{
	struct zvol_state_geom *zsg = &zv->zv_zso->zso_geom;
	struct g_provider *pp = zsg->zsg_provider;

	ASSERT3S(zv->zv_volmode, ==, ZFS_VOLMODE_GEOM);

	g_topology_assert();

	mutex_enter(&zv->zv_state_lock);
	- VERIFY(zsg->zsg_state == ZVOL_GEOM_RUNNING);
	+ VERIFY3S(zsg->zsg_state, ==, ZVOL_GEOM_RUNNING);
	mutex_exit(&zv->zv_state_lock);
	zsg->zsg_provider = NULL;
	g_wither_geom(pp->geom, ENXIO);
	}

	void
	zvol_wait_close(zvol_state_t *zv)
	{

	if (zv->zv_volmode != ZFS_VOLMODE_GEOM)
	return;
	mutex_enter(&zv->zv_state_lock);
	zv->zv_zso->zso_dying = B_TRUE;

	if (zv->zv_open_count)
	msleep(zv, &zv->zv_state_lock,
	PRIBIO, "zvol:dying", 10*hz);
	mutex_exit(&zv->zv_state_lock);
	}


	static int
	zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace)
	{
	int count, error, flags;

	g_topology_assert();

	/*
	* To make it easier we expect either open or close, but not both
	* at the same time.
	*/
	KASSERT((acr >= 0 && acw >= 0 && ace >= 0) \|\|
	(acr <= 0 && acw <= 0 && ace <= 0),
	("Unsupported access request to %s (acr=%d, acw=%d, ace=%d).",
	pp->name, acr, acw, ace));

	if (pp->private == NULL) {
	if (acr <= 0 && acw <= 0 && ace <= 0)
	return (0);
	return (pp->error);
	}

	/*
	* We don't pass FEXCL flag to zvol_geom_open()/zvol_geom_close() if
	* ace != 0, because GEOM already handles that and handles it a bit
	* differently. GEOM allows for multiple read/exclusive consumers and
	* ZFS allows only one exclusive consumer, no matter if it is reader or
	* writer. I like better the way GEOM works so I'll leave it for GEOM
	* to decide what to do.
	*/

	count = acr + acw + ace;
	if (count == 0)
	return (0);

	flags = 0;
	if (acr != 0 \|\| ace != 0)
	flags \|= FREAD;
	if (acw != 0)
	flags \|= FWRITE;

	g_topology_unlock();
	if (count > 0)
	error = zvol_geom_open(pp, flags, count);
	else
	error = zvol_geom_close(pp, flags, -count);
	g_topology_lock();
	return (error);
	}

	static void
	zvol_geom_worker(void *arg)
	{
	zvol_state_t *zv = arg;
	struct zvol_state_geom *zsg = &zv->zv_zso->zso_geom;
	struct bio *bp;

	ASSERT3S(zv->zv_volmode, ==, ZFS_VOLMODE_GEOM);

	thread_lock(curthread);
	sched_prio(curthread, PRIBIO);
	thread_unlock(curthread);

	for (;;) {
	mtx_lock(&zsg->zsg_queue_mtx);
	bp = bioq_takefirst(&zsg->zsg_queue);
	if (bp == NULL) {
	if (zsg->zsg_state == ZVOL_GEOM_STOPPED) {
	zsg->zsg_state = ZVOL_GEOM_RUNNING;
	wakeup(&zsg->zsg_state);
	mtx_unlock(&zsg->zsg_queue_mtx);
	kthread_exit();
	}
	msleep(&zsg->zsg_queue, &zsg->zsg_queue_mtx,
	PRIBIO \| PDROP, "zvol:io", 0);
	continue;
	}
	mtx_unlock(&zsg->zsg_queue_mtx);
	zvol_geom_bio_strategy(bp);
	}
	}

	static void
	zvol_geom_bio_start(struct bio *bp)
	{
	zvol_state_t *zv = bp->bio_to->private;
	struct zvol_state_geom *zsg;
	boolean_t first;

	if (zv == NULL) {
	g_io_deliver(bp, ENXIO);
	return;
	}
	if (bp->bio_cmd == BIO_GETATTR) {
	if (zvol_geom_bio_getattr(bp))
	g_io_deliver(bp, EOPNOTSUPP);
	return;
	}

	if (!THREAD_CAN_SLEEP()) {
	zsg = &zv->zv_zso->zso_geom;
	mtx_lock(&zsg->zsg_queue_mtx);
	first = (bioq_first(&zsg->zsg_queue) == NULL);
	bioq_insert_tail(&zsg->zsg_queue, bp);
	mtx_unlock(&zsg->zsg_queue_mtx);
	if (first)
	wakeup_one(&zsg->zsg_queue);
	return;
	}

	zvol_geom_bio_strategy(bp);
	}

	static int
	zvol_geom_bio_getattr(struct bio *bp)
	{
	zvol_state_t *zv;

	zv = bp->bio_to->private;
	ASSERT3P(zv, !=, NULL);

	spa_t *spa = dmu_objset_spa(zv->zv_objset);
	uint64_t refd, avail, usedobjs, availobjs;

	if (g_handleattr_int(bp, "GEOM::candelete", 1))
	return (0);
	if (strcmp(bp->bio_attribute, "blocksavail") == 0) {
	dmu_objset_space(zv->zv_objset, &refd, &avail,
	&usedobjs, &availobjs);
	if (g_handleattr_off_t(bp, "blocksavail", avail / DEV_BSIZE))
	return (0);
	} else if (strcmp(bp->bio_attribute, "blocksused") == 0) {
	dmu_objset_space(zv->zv_objset, &refd, &avail,
	&usedobjs, &availobjs);
	if (g_handleattr_off_t(bp, "blocksused", refd / DEV_BSIZE))
	return (0);
	} else if (strcmp(bp->bio_attribute, "poolblocksavail") == 0) {
	avail = metaslab_class_get_space(spa_normal_class(spa));
	avail -= metaslab_class_get_alloc(spa_normal_class(spa));
	if (g_handleattr_off_t(bp, "poolblocksavail",
	avail / DEV_BSIZE))
	return (0);
	} else if (strcmp(bp->bio_attribute, "poolblocksused") == 0) {
	refd = metaslab_class_get_alloc(spa_normal_class(spa));
	if (g_handleattr_off_t(bp, "poolblocksused", refd / DEV_BSIZE))
	return (0);
	}
	return (1);
	}

	static void
	zvol_geom_bio_strategy(struct bio *bp)
	{
	zvol_state_t *zv;
	uint64_t off, volsize;
	size_t resid;
	char *addr;
	objset_t *os;
	zfs_locked_range_t *lr;
	int error = 0;
	boolean_t doread = B_FALSE;
	boolean_t is_dumpified;
	boolean_t sync;

	if (bp->bio_to)
	zv = bp->bio_to->private;
	else
	zv = bp->bio_dev->si_drv2;

	if (zv == NULL) {
	error = SET_ERROR(ENXIO);
	goto out;
	}

	rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);

	switch (bp->bio_cmd) {
	case BIO_READ:
	doread = B_TRUE;
	break;
	case BIO_WRITE:
	case BIO_FLUSH:
	case BIO_DELETE:
	if (zv->zv_flags & ZVOL_RDONLY) {
	error = SET_ERROR(EROFS);
	goto resume;
	}
	zvol_ensure_zilog(zv);
	if (bp->bio_cmd == BIO_FLUSH)
	goto sync;
	break;
	default:
	error = SET_ERROR(EOPNOTSUPP);
	goto resume;
	}

	off = bp->bio_offset;
	volsize = zv->zv_volsize;

	os = zv->zv_objset;
	ASSERT3P(os, !=, NULL);

	addr = bp->bio_data;
	resid = bp->bio_length;

	if (resid > 0 && off >= volsize) {
	error = SET_ERROR(EIO);
	goto resume;
	}

	is_dumpified = B_FALSE;
	sync = !doread && !is_dumpified &&
	zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS;

	/*
	* There must be no buffer changes when doing a dmu_sync() because
	* we can't change the data whilst calculating the checksum.
	*/
	lr = zfs_rangelock_enter(&zv->zv_rangelock, off, resid,
	doread ? RL_READER : RL_WRITER);

	if (bp->bio_cmd == BIO_DELETE) {
	dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error != 0) {
	dmu_tx_abort(tx);
	} else {
	zvol_log_truncate(zv, tx, off, resid, sync);
	dmu_tx_commit(tx);
	error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
	off, resid);
	resid = 0;
	}
	goto unlock;
	}
	while (resid != 0 && off < volsize) {
	size_t size = MIN(resid, zvol_maxphys);
	if (doread) {
	error = dmu_read(os, ZVOL_OBJ, off, size, addr,
	DMU_READ_PREFETCH);
	} else {
	dmu_tx_t *tx = dmu_tx_create(os);
	dmu_tx_hold_write_by_dnode(tx, zv->zv_dn, off, size);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	} else {
	dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
	zvol_log_write(zv, tx, off, size, sync);
	dmu_tx_commit(tx);
	}
	}
	if (error) {
	/* convert checksum errors into IO errors */
	if (error == ECKSUM)
	error = SET_ERROR(EIO);
	break;
	}
	off += size;
	addr += size;
	resid -= size;
	}
	unlock:
	zfs_rangelock_exit(lr);

	bp->bio_completed = bp->bio_length - resid;
	if (bp->bio_completed < bp->bio_length && off > volsize)
	error = SET_ERROR(EINVAL);

	switch (bp->bio_cmd) {
	case BIO_FLUSH:
	break;
	case BIO_READ:
	dataset_kstats_update_read_kstats(&zv->zv_kstat,
	bp->bio_completed);
	break;
	case BIO_WRITE:
	dataset_kstats_update_write_kstats(&zv->zv_kstat,
	bp->bio_completed);
	break;
	case BIO_DELETE:
	break;
	default:
	break;
	}

	if (sync) {
	sync:
	zil_commit(zv->zv_zilog, ZVOL_OBJ);
	}
	resume:
	rw_exit(&zv->zv_suspend_lock);
	out:
	if (bp->bio_to)
	g_io_deliver(bp, error);
	else
	biofinish(bp, NULL, error);
	}

	/*
	* Character device mode implementation
	*/

	static int
	zvol_cdev_read(struct cdev dev, struct uio uio_s, int ioflag)
	{
	zvol_state_t *zv;
	uint64_t volsize;
	zfs_locked_range_t *lr;
	int error = 0;
	zfs_uio_t uio;

	zfs_uio_init(&uio, uio_s);

	zv = dev->si_drv2;

	volsize = zv->zv_volsize;
	/*
	* uio_loffset == volsize isn't an error as
	* it's required for EOF processing.
	*/
	if (zfs_uio_resid(&uio) > 0 &&
	(zfs_uio_offset(&uio) < 0 \|\| zfs_uio_offset(&uio) > volsize))
	return (SET_ERROR(EIO));

	ssize_t start_resid = zfs_uio_resid(&uio);
	lr = zfs_rangelock_enter(&zv->zv_rangelock, zfs_uio_offset(&uio),
	zfs_uio_resid(&uio), RL_READER);
	while (zfs_uio_resid(&uio) > 0 && zfs_uio_offset(&uio) < volsize) {
	uint64_t bytes = MIN(zfs_uio_resid(&uio), DMU_MAX_ACCESS >> 1);

	/* don't read past the end */
	if (bytes > volsize - zfs_uio_offset(&uio))
	bytes = volsize - zfs_uio_offset(&uio);

	error = dmu_read_uio_dnode(zv->zv_dn, &uio, bytes);
	if (error) {
	/* convert checksum errors into IO errors */
	if (error == ECKSUM)
	error = SET_ERROR(EIO);
	break;
	}
	}
	zfs_rangelock_exit(lr);
	int64_t nread = start_resid - zfs_uio_resid(&uio);
	dataset_kstats_update_read_kstats(&zv->zv_kstat, nread);

	return (error);
	}

	static int
	zvol_cdev_write(struct cdev dev, struct uio uio_s, int ioflag)
	{
	zvol_state_t *zv;
	uint64_t volsize;
	zfs_locked_range_t *lr;
	int error = 0;
	boolean_t sync;
	zfs_uio_t uio;

	zv = dev->si_drv2;

	volsize = zv->zv_volsize;

	zfs_uio_init(&uio, uio_s);

	if (zfs_uio_resid(&uio) > 0 &&
	(zfs_uio_offset(&uio) < 0 \|\| zfs_uio_offset(&uio) > volsize))
	return (SET_ERROR(EIO));

	ssize_t start_resid = zfs_uio_resid(&uio);
	sync = (ioflag & IO_SYNC) \|\|
	(zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);

	rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);
	zvol_ensure_zilog(zv);

	lr = zfs_rangelock_enter(&zv->zv_rangelock, zfs_uio_offset(&uio),
	zfs_uio_resid(&uio), RL_WRITER);
	while (zfs_uio_resid(&uio) > 0 && zfs_uio_offset(&uio) < volsize) {
	uint64_t bytes = MIN(zfs_uio_resid(&uio), DMU_MAX_ACCESS >> 1);
	uint64_t off = zfs_uio_offset(&uio);
	dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);

	if (bytes > volsize - off) /* don't write past the end */
	bytes = volsize - off;

	dmu_tx_hold_write_by_dnode(tx, zv->zv_dn, off, bytes);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	break;
	}
	error = dmu_write_uio_dnode(zv->zv_dn, &uio, bytes, tx);
	if (error == 0)
	zvol_log_write(zv, tx, off, bytes, sync);
	dmu_tx_commit(tx);

	if (error)
	break;
	}
	zfs_rangelock_exit(lr);
	int64_t nwritten = start_resid - zfs_uio_resid(&uio);
	dataset_kstats_update_write_kstats(&zv->zv_kstat, nwritten);
	if (sync)
	zil_commit(zv->zv_zilog, ZVOL_OBJ);
	rw_exit(&zv->zv_suspend_lock);
	return (error);
	}

	static int
	zvol_cdev_open(struct cdev dev, int flags, int fmt, struct thread td)
	{
	zvol_state_t *zv;
	struct zvol_state_dev *zsd;
	int err = 0;
	boolean_t drop_suspend = B_FALSE;
	boolean_t drop_namespace = B_FALSE;

	retry:
	rw_enter(&zvol_state_lock, ZVOL_RW_READER);
	zv = dev->si_drv2;
	if (zv == NULL) {
	rw_exit(&zvol_state_lock);
	err = SET_ERROR(ENXIO);
	goto out_locked;
	}

	if (zv->zv_open_count == 0 && !mutex_owned(&spa_namespace_lock)) {
	/*
	* We need to guarantee that the namespace lock is held
	* to avoid spurious failures in zvol_first_open.
	*/
	drop_namespace = B_TRUE;
	if (!mutex_tryenter(&spa_namespace_lock)) {
	rw_exit(&zvol_state_lock);
	mutex_enter(&spa_namespace_lock);
	goto retry;
	}
	}
	mutex_enter(&zv->zv_state_lock);

	ASSERT3S(zv->zv_volmode, ==, ZFS_VOLMODE_DEV);

	/*
	* make sure zvol is not suspended during first open
	* (hold zv_suspend_lock) and respect proper lock acquisition
	* ordering - zv_suspend_lock before zv_state_lock
	*/
	if (zv->zv_open_count == 0) {
	drop_suspend = B_TRUE;
	if (!rw_tryenter(&zv->zv_suspend_lock, ZVOL_RW_READER)) {
	mutex_exit(&zv->zv_state_lock);
	rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);
	mutex_enter(&zv->zv_state_lock);
	/* check to see if zv_suspend_lock is needed */
	if (zv->zv_open_count != 0) {
	rw_exit(&zv->zv_suspend_lock);
	drop_suspend = B_FALSE;
	}
	}
	}
	rw_exit(&zvol_state_lock);

	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	if (zv->zv_open_count == 0) {
	ASSERT(ZVOL_RW_READ_HELD(&zv->zv_suspend_lock));
	err = zvol_first_open(zv, !(flags & FWRITE));
	if (err)
	goto out_zv_locked;
	}

	if ((flags & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
	err = SET_ERROR(EROFS);
	goto out_opened;
	}
	if (zv->zv_flags & ZVOL_EXCL) {
	err = SET_ERROR(EBUSY);
	goto out_opened;
	}
	#ifdef FEXCL
	if (flags & FEXCL) {
	if (zv->zv_open_count != 0) {
	err = SET_ERROR(EBUSY);
	goto out_opened;
	}
	zv->zv_flags \|= ZVOL_EXCL;
	}
	#endif

	zv->zv_open_count++;
	if (flags & (FSYNC \| FDSYNC)) {
	zsd = &zv->zv_zso->zso_dev;
	zsd->zsd_sync_cnt++;
	if (zsd->zsd_sync_cnt == 1 &&
	(zv->zv_flags & ZVOL_WRITTEN_TO) != 0)
	zil_async_to_sync(zv->zv_zilog, ZVOL_OBJ);
	}
	out_opened:
	if (zv->zv_open_count == 0) {
	zvol_last_close(zv);
	wakeup(zv);
	}
	out_zv_locked:
	mutex_exit(&zv->zv_state_lock);
	out_locked:
	if (drop_namespace)
	mutex_exit(&spa_namespace_lock);
	if (drop_suspend)
	rw_exit(&zv->zv_suspend_lock);
	return (err);
	}

	static int
	zvol_cdev_close(struct cdev dev, int flags, int fmt, struct thread td)
	{
	zvol_state_t *zv;
	struct zvol_state_dev *zsd;
	boolean_t drop_suspend = B_TRUE;

	rw_enter(&zvol_state_lock, ZVOL_RW_READER);
	zv = dev->si_drv2;
	if (zv == NULL) {
	rw_exit(&zvol_state_lock);
	return (SET_ERROR(ENXIO));
	}

	mutex_enter(&zv->zv_state_lock);
	if (zv->zv_flags & ZVOL_EXCL) {
	ASSERT3U(zv->zv_open_count, ==, 1);
	zv->zv_flags &= ~ZVOL_EXCL;
	}

	ASSERT3S(zv->zv_volmode, ==, ZFS_VOLMODE_DEV);

	/*
	* If the open count is zero, this is a spurious close.
	* That indicates a bug in the kernel / DDI framework.
	*/
	ASSERT3U(zv->zv_open_count, >, 0);
	/*
	* make sure zvol is not suspended during last close
	* (hold zv_suspend_lock) and respect proper lock acquisition
	* ordering - zv_suspend_lock before zv_state_lock
	*/
	if (zv->zv_open_count == 1) {
	if (!rw_tryenter(&zv->zv_suspend_lock, ZVOL_RW_READER)) {
	mutex_exit(&zv->zv_state_lock);
	rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);
	mutex_enter(&zv->zv_state_lock);
	/* check to see if zv_suspend_lock is needed */
	if (zv->zv_open_count != 1) {
	rw_exit(&zv->zv_suspend_lock);
	drop_suspend = B_FALSE;
	}
	}
	} else {
	drop_suspend = B_FALSE;
	}
	rw_exit(&zvol_state_lock);

	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	/*
	* You may get multiple opens, but only one close.
	*/
	zv->zv_open_count--;
	if (flags & (FSYNC \| FDSYNC)) {
	zsd = &zv->zv_zso->zso_dev;
	zsd->zsd_sync_cnt--;
	}

	if (zv->zv_open_count == 0) {
	ASSERT(ZVOL_RW_READ_HELD(&zv->zv_suspend_lock));
	zvol_last_close(zv);
	wakeup(zv);
	}

	mutex_exit(&zv->zv_state_lock);

	if (drop_suspend)
	rw_exit(&zv->zv_suspend_lock);
	return (0);
	}

	static int
	zvol_cdev_ioctl(struct cdev *dev, ulong_t cmd, caddr_t data,
	int fflag, struct thread *td)
	{
	zvol_state_t *zv;
	zfs_locked_range_t *lr;
	off_t offset, length;
	int i, error;
	boolean_t sync;

	zv = dev->si_drv2;

	error = 0;
	KASSERT(zv->zv_open_count > 0,
	("Device with zero access count in %s", __func__));

	i = IOCPARM_LEN(cmd);
	switch (cmd) {
	case DIOCGSECTORSIZE:
	(uint32_t )data = DEV_BSIZE;
	break;
	case DIOCGMEDIASIZE:
	(off_t )data = zv->zv_volsize;
	break;
	case DIOCGFLUSH:
	rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);
	if (zv->zv_zilog != NULL)
	zil_commit(zv->zv_zilog, ZVOL_OBJ);
	rw_exit(&zv->zv_suspend_lock);
	break;
	case DIOCGDELETE:
	if (!zvol_unmap_enabled)
	break;

	offset = ((off_t *)data)[0];
	length = ((off_t *)data)[1];
	if ((offset % DEV_BSIZE) != 0 \|\| (length % DEV_BSIZE) != 0 \|\|
	offset < 0 \|\| offset >= zv->zv_volsize \|\|
	length <= 0) {
	printf("%s: offset=%jd length=%jd\n", __func__, offset,
	length);
	error = SET_ERROR(EINVAL);
	break;
	}
	rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);
	zvol_ensure_zilog(zv);
	lr = zfs_rangelock_enter(&zv->zv_rangelock, offset, length,
	RL_WRITER);
	dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error != 0) {
	sync = FALSE;
	dmu_tx_abort(tx);
	} else {
	sync = (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
	zvol_log_truncate(zv, tx, offset, length, sync);
	dmu_tx_commit(tx);
	error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ,
	offset, length);
	}
	zfs_rangelock_exit(lr);
	if (sync)
	zil_commit(zv->zv_zilog, ZVOL_OBJ);
	rw_exit(&zv->zv_suspend_lock);
	break;
	case DIOCGSTRIPESIZE:
	(off_t )data = zv->zv_volblocksize;
	break;
	case DIOCGSTRIPEOFFSET:
	(off_t )data = 0;
	break;
	case DIOCGATTR: {
	spa_t *spa = dmu_objset_spa(zv->zv_objset);
	struct diocgattr_arg arg = (struct diocgattr_arg )data;
	uint64_t refd, avail, usedobjs, availobjs;

	if (strcmp(arg->name, "GEOM::candelete") == 0)
	arg->value.i = 1;
	else if (strcmp(arg->name, "blocksavail") == 0) {
	dmu_objset_space(zv->zv_objset, &refd, &avail,
	&usedobjs, &availobjs);
	arg->value.off = avail / DEV_BSIZE;
	} else if (strcmp(arg->name, "blocksused") == 0) {
	dmu_objset_space(zv->zv_objset, &refd, &avail,
	&usedobjs, &availobjs);
	arg->value.off = refd / DEV_BSIZE;
	} else if (strcmp(arg->name, "poolblocksavail") == 0) {
	avail = metaslab_class_get_space(spa_normal_class(spa));
	avail -= metaslab_class_get_alloc(
	spa_normal_class(spa));
	arg->value.off = avail / DEV_BSIZE;
	} else if (strcmp(arg->name, "poolblocksused") == 0) {
	refd = metaslab_class_get_alloc(spa_normal_class(spa));
	arg->value.off = refd / DEV_BSIZE;
	} else
	error = SET_ERROR(ENOIOCTL);
	break;
	}
	case FIOSEEKHOLE:
	case FIOSEEKDATA: {
	off_t off = (off_t )data;
	uint64_t noff;
	boolean_t hole;

	hole = (cmd == FIOSEEKHOLE);
	noff = *off;
	error = dmu_offset_next(zv->zv_objset, ZVOL_OBJ, hole, &noff);
	*off = noff;
	break;
	}
	default:
	error = SET_ERROR(ENOIOCTL);
	}

	return (error);
	}

	/*
	* Misc. helpers
	*/

	static void
	zvol_ensure_zilog(zvol_state_t *zv)
	{
	ASSERT(ZVOL_RW_READ_HELD(&zv->zv_suspend_lock));

	/*
	* Open a ZIL if this is the first time we have written to this
	* zvol. We protect zv->zv_zilog with zv_suspend_lock rather
	* than zv_state_lock so that we don't need to acquire an
	* additional lock in this path.
	*/
	if (zv->zv_zilog == NULL) {
	if (!rw_tryupgrade(&zv->zv_suspend_lock)) {
	rw_exit(&zv->zv_suspend_lock);
	rw_enter(&zv->zv_suspend_lock, RW_WRITER);
	}
	if (zv->zv_zilog == NULL) {
	zv->zv_zilog = zil_open(zv->zv_objset,
	zvol_get_data);
	zv->zv_flags \|= ZVOL_WRITTEN_TO;
	/* replay / destroy done in zvol_create_minor_impl() */
	- VERIFY0((zv->zv_zilog->zl_header->zh_flags &
	- ZIL_REPLAY_NEEDED));
	+ VERIFY0(zv->zv_zilog->zl_header->zh_flags &
	+ ZIL_REPLAY_NEEDED);
	}
	rw_downgrade(&zv->zv_suspend_lock);
	}
	}

	static boolean_t
	zvol_is_zvol_impl(const char *device)
	{
	return (device && strncmp(device, ZVOL_DIR, strlen(ZVOL_DIR)) == 0);
	}

	static void
	zvol_rename_minor(zvol_state_t zv, const char newname)
	{
	ASSERT(RW_LOCK_HELD(&zvol_state_lock));
	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	/* move to new hashtable entry */
	zv->zv_hash = zvol_name_hash(zv->zv_name);
	hlist_del(&zv->zv_hlink);
	hlist_add_head(&zv->zv_hlink, ZVOL_HT_HEAD(zv->zv_hash));

	if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
	struct zvol_state_geom *zsg = &zv->zv_zso->zso_geom;
	struct g_provider *pp = zsg->zsg_provider;
	struct g_geom *gp;

	g_topology_lock();
	gp = pp->geom;
	ASSERT3P(gp, !=, NULL);

	zsg->zsg_provider = NULL;
	g_wither_provider(pp, ENXIO);

	pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, newname);
	pp->flags \|= G_PF_DIRECT_RECEIVE \| G_PF_DIRECT_SEND;
	pp->sectorsize = DEV_BSIZE;
	pp->mediasize = zv->zv_volsize;
	pp->private = zv;
	zsg->zsg_provider = pp;
	g_error_provider(pp, 0);
	g_topology_unlock();
	} else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
	struct zvol_state_dev *zsd = &zv->zv_zso->zso_dev;
	struct cdev *dev;
	struct make_dev_args args;

	dev = zsd->zsd_cdev;
	if (dev != NULL) {
	destroy_dev(dev);
	dev = zsd->zsd_cdev = NULL;
	if (zv->zv_open_count > 0) {
	zv->zv_flags &= ~ZVOL_EXCL;
	zv->zv_open_count = 0;
	/* XXX need suspend lock but lock order */
	zvol_last_close(zv);
	}
	}

	make_dev_args_init(&args);
	args.mda_flags = MAKEDEV_CHECKNAME \| MAKEDEV_WAITOK;
	args.mda_devsw = &zvol_cdevsw;
	args.mda_cr = NULL;
	args.mda_uid = UID_ROOT;
	args.mda_gid = GID_OPERATOR;
	args.mda_mode = 0640;
	args.mda_si_drv2 = zv;
	if (make_dev_s(&args, &dev, "%s/%s", ZVOL_DRIVER, newname)
	== 0) {
	+#if __FreeBSD_version > 1300130
	dev->si_iosize_max = maxphys;
	+#else
	+ dev->si_iosize_max = MAXPHYS;
	+#endif
	zsd->zsd_cdev = dev;
	}
	}
	strlcpy(zv->zv_name, newname, sizeof (zv->zv_name));
	}

	/*
	* Remove minor node for the specified volume.
	*/
	static void
	zvol_free(zvol_state_t *zv)
	{
	ASSERT(!RW_LOCK_HELD(&zv->zv_suspend_lock));
	ASSERT(!MUTEX_HELD(&zv->zv_state_lock));
	ASSERT0(zv->zv_open_count);

	ZFS_LOG(1, "ZVOL %s destroyed.", zv->zv_name);

	rw_destroy(&zv->zv_suspend_lock);
	zfs_rangelock_fini(&zv->zv_rangelock);

	if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
	struct zvol_state_geom *zsg = &zv->zv_zso->zso_geom;
	struct g_provider *pp __maybe_unused = zsg->zsg_provider;

	ASSERT3P(pp->private, ==, NULL);

	g_topology_lock();
	zvol_geom_destroy(zv);
	g_topology_unlock();
	mtx_destroy(&zsg->zsg_queue_mtx);
	} else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
	struct zvol_state_dev *zsd = &zv->zv_zso->zso_dev;
	struct cdev *dev = zsd->zsd_cdev;

	- ASSERT3P(dev->si_drv2, ==, NULL);
	-
	- destroy_dev(dev);
	+ if (dev != NULL) {
	+ ASSERT3P(dev->si_drv2, ==, NULL);
	+ destroy_dev(dev);
	+ }
	}

	mutex_destroy(&zv->zv_state_lock);
	dataset_kstats_destroy(&zv->zv_kstat);
	kmem_free(zv->zv_zso, sizeof (struct zvol_state_os));
	kmem_free(zv, sizeof (zvol_state_t));
	zvol_minors--;
	}

	/*
	* Create a minor node (plus a whole lot more) for the specified volume.
	*/
	static int
	zvol_create_minor_impl(const char *name)
	{
	zvol_state_t *zv;
	objset_t *os;
	dmu_object_info_t *doi;
	uint64_t volsize;
	uint64_t volmode, hash;
	int error;

	ZFS_LOG(1, "Creating ZVOL %s...", name);
	hash = zvol_name_hash(name);
	if ((zv = zvol_find_by_name_hash(name, hash, RW_NONE)) != NULL) {
	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
	mutex_exit(&zv->zv_state_lock);
	return (SET_ERROR(EEXIST));
	}

	DROP_GIANT();

	doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP);

	/* lie and say we're read-only */
	error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, B_TRUE, FTAG, &os);
	if (error)
	goto out_doi;

	error = dmu_object_info(os, ZVOL_OBJ, doi);
	if (error)
	goto out_dmu_objset_disown;

	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
	if (error)
	goto out_dmu_objset_disown;

	error = dsl_prop_get_integer(name,
	zfs_prop_to_name(ZFS_PROP_VOLMODE), &volmode, NULL);
	if (error \|\| volmode == ZFS_VOLMODE_DEFAULT)
	volmode = zvol_volmode;
	error = 0;

	/*
	* zvol_alloc equivalent ...
	*/
	zv = kmem_zalloc(sizeof (*zv), KM_SLEEP);
	zv->zv_hash = hash;
	mutex_init(&zv->zv_state_lock, NULL, MUTEX_DEFAULT, NULL);
	zv->zv_zso = kmem_zalloc(sizeof (struct zvol_state_os), KM_SLEEP);
	zv->zv_volmode = volmode;
	if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
	struct zvol_state_geom *zsg = &zv->zv_zso->zso_geom;
	struct g_provider *pp;
	struct g_geom *gp;

	zsg->zsg_state = ZVOL_GEOM_UNINIT;
	mtx_init(&zsg->zsg_queue_mtx, "zvol", NULL, MTX_DEF);

	g_topology_lock();
	gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name);
	gp->start = zvol_geom_bio_start;
	gp->access = zvol_geom_access;
	pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, name);
	pp->flags \|= G_PF_DIRECT_RECEIVE \| G_PF_DIRECT_SEND;
	pp->sectorsize = DEV_BSIZE;
	pp->mediasize = 0;
	pp->private = zv;

	zsg->zsg_provider = pp;
	bioq_init(&zsg->zsg_queue);
	} else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
	struct zvol_state_dev *zsd = &zv->zv_zso->zso_dev;
	struct cdev *dev;
	struct make_dev_args args;

	make_dev_args_init(&args);
	args.mda_flags = MAKEDEV_CHECKNAME \| MAKEDEV_WAITOK;
	args.mda_devsw = &zvol_cdevsw;
	args.mda_cr = NULL;
	args.mda_uid = UID_ROOT;
	args.mda_gid = GID_OPERATOR;
	args.mda_mode = 0640;
	args.mda_si_drv2 = zv;
	- error = make_dev_s(&args, &dev, "%s/%s", ZVOL_DRIVER, name);
	- if (error) {
	- kmem_free(zv->zv_zso, sizeof (struct zvol_state_os));
	- mutex_destroy(&zv->zv_state_lock);
	- kmem_free(zv, sizeof (*zv));
	- dmu_objset_disown(os, B_TRUE, FTAG);
	- goto out_doi;
	+ if (make_dev_s(&args, &dev, "%s/%s", ZVOL_DRIVER, name)
	+ == 0) {
	+#if __FreeBSD_version > 1300130
	+ dev->si_iosize_max = maxphys;
	+#else
	+ dev->si_iosize_max = MAXPHYS;
	+#endif
	+ zsd->zsd_cdev = dev;
	}
	- dev->si_iosize_max = maxphys;
	- zsd->zsd_cdev = dev;
	}
	(void) strlcpy(zv->zv_name, name, MAXPATHLEN);
	rw_init(&zv->zv_suspend_lock, NULL, RW_DEFAULT, NULL);
	zfs_rangelock_init(&zv->zv_rangelock, NULL, NULL);

	if (dmu_objset_is_snapshot(os) \|\| !spa_writeable(dmu_objset_spa(os)))
	zv->zv_flags \|= ZVOL_RDONLY;

	zv->zv_volblocksize = doi->doi_data_block_size;
	zv->zv_volsize = volsize;
	zv->zv_objset = os;

	ASSERT3P(zv->zv_zilog, ==, NULL);
	zv->zv_zilog = zil_open(os, zvol_get_data);
	if (spa_writeable(dmu_objset_spa(os))) {
	if (zil_replay_disable)
	zil_destroy(zv->zv_zilog, B_FALSE);
	else
	zil_replay(os, zv, zvol_replay_vector);
	}
	zil_close(zv->zv_zilog);
	zv->zv_zilog = NULL;
	ASSERT3P(zv->zv_kstat.dk_kstats, ==, NULL);
	dataset_kstats_create(&zv->zv_kstat, zv->zv_objset);

	/* TODO: prefetch for geom tasting */

	zv->zv_objset = NULL;
	out_dmu_objset_disown:
	dmu_objset_disown(os, B_TRUE, FTAG);

	if (error == 0 && volmode == ZFS_VOLMODE_GEOM) {
	zvol_geom_run(zv);
	g_topology_unlock();
	}
	out_doi:
	kmem_free(doi, sizeof (dmu_object_info_t));
	if (error == 0) {
	rw_enter(&zvol_state_lock, RW_WRITER);
	zvol_insert(zv);
	zvol_minors++;
	rw_exit(&zvol_state_lock);
	ZFS_LOG(1, "ZVOL %s created.", name);
	}
	PICKUP_GIANT();
	return (error);
	}

	static void
	zvol_clear_private(zvol_state_t *zv)
	{
	ASSERT(RW_LOCK_HELD(&zvol_state_lock));
	if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
	struct zvol_state_geom *zsg = &zv->zv_zso->zso_geom;
	struct g_provider *pp = zsg->zsg_provider;

	if (pp->private == NULL) /* already cleared */
	return;

	mtx_lock(&zsg->zsg_queue_mtx);
	zsg->zsg_state = ZVOL_GEOM_STOPPED;
	pp->private = NULL;
	wakeup_one(&zsg->zsg_queue);
	while (zsg->zsg_state != ZVOL_GEOM_RUNNING)
	msleep(&zsg->zsg_state, &zsg->zsg_queue_mtx,
	0, "zvol:w", 0);
	mtx_unlock(&zsg->zsg_queue_mtx);
	ASSERT(!RW_LOCK_HELD(&zv->zv_suspend_lock));
	} else if (zv->zv_volmode == ZFS_VOLMODE_DEV) {
	struct zvol_state_dev *zsd = &zv->zv_zso->zso_dev;
	struct cdev *dev = zsd->zsd_cdev;

	- dev->si_drv2 = NULL;
	+ if (dev != NULL)
	+ dev->si_drv2 = NULL;
	}
	}

	static int
	zvol_update_volsize(zvol_state_t *zv, uint64_t volsize)
	{
	zv->zv_volsize = volsize;
	if (zv->zv_volmode == ZFS_VOLMODE_GEOM) {
	struct zvol_state_geom *zsg = &zv->zv_zso->zso_geom;
	struct g_provider *pp = zsg->zsg_provider;

	g_topology_lock();

	if (pp->private == NULL) {
	g_topology_unlock();
	return (SET_ERROR(ENXIO));
	}

	/*
	* Do not invoke resize event when initial size was zero.
	* ZVOL initializes the size on first open, this is not
	* real resizing.
	*/
	if (pp->mediasize == 0)
	pp->mediasize = zv->zv_volsize;
	else
	g_resize_provider(pp, zv->zv_volsize);

	g_topology_unlock();
	}
	return (0);
	}

	static void
	zvol_set_disk_ro_impl(zvol_state_t *zv, int flags)
	{
	// XXX? set_disk_ro(zv->zv_zso->zvo_disk, flags);
	}

	static void
	zvol_set_capacity_impl(zvol_state_t *zv, uint64_t capacity)
	{
	// XXX? set_capacity(zv->zv_zso->zvo_disk, capacity);
	}

	const static zvol_platform_ops_t zvol_freebsd_ops = {
	.zv_free = zvol_free,
	.zv_rename_minor = zvol_rename_minor,
	.zv_create_minor = zvol_create_minor_impl,
	.zv_update_volsize = zvol_update_volsize,
	.zv_clear_private = zvol_clear_private,
	.zv_is_zvol = zvol_is_zvol_impl,
	.zv_set_disk_ro = zvol_set_disk_ro_impl,
	.zv_set_capacity = zvol_set_capacity_impl,
	};

	/*
	* Public interfaces
	*/

	int
	zvol_busy(void)
	{
	return (zvol_minors != 0);
	}

	int
	zvol_init(void)
	{
	zvol_init_impl();
	zvol_register_ops(&zvol_freebsd_ops);
	return (0);
	}

	void
	zvol_fini(void)
	{
	zvol_fini_impl();
	}
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/abd_os.c b/sys/contrib/openzfs/module/os/linux/zfs/abd_os.c
	index af543d6e3f7e..d1d238a4e303 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/abd_os.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/abd_os.c
	@@ -1,1146 +1,1147 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
	* Copyright (c) 2019 by Delphix. All rights reserved.
	*/

	/*
	* See abd.c for a general overview of the arc buffered data (ABD).
	*
	* Linear buffers act exactly like normal buffers and are always mapped into the
	* kernel's virtual memory space, while scattered ABD data chunks are allocated
	* as physical pages and then mapped in only while they are actually being
	* accessed through one of the abd_* library functions. Using scattered ABDs
	* provides several benefits:
	*
	* (1) They avoid use of kmem_*, preventing performance problems where running
	* kmem_reap on very large memory systems never finishes and causes
	* constant TLB shootdowns.
	*
	* (2) Fragmentation is less of an issue since when we are at the limit of
	* allocatable space, we won't have to search around for a long free
	* hole in the VA space for large ARC allocations. Each chunk is mapped in
	* individually, so even if we are using HIGHMEM (see next point) we
	* wouldn't need to worry about finding a contiguous address range.
	*
	* (3) If we are not using HIGHMEM, then all physical memory is always
	* mapped into the kernel's address space, so we also avoid the map /
	* unmap costs on each ABD access.
	*
	* If we are not using HIGHMEM, scattered buffers which have only one chunk
	* can be treated as linear buffers, because they are contiguous in the
	* kernel's virtual address space. See abd_alloc_chunks() for details.
	*/

	#include <sys/abd_impl.h>
	#include <sys/param.h>
	#include <sys/zio.h>
	#include <sys/arc.h>
	#include <sys/zfs_context.h>
	#include <sys/zfs_znode.h>
	#ifdef _KERNEL
	#include <linux/kmap_compat.h>
	#include <linux/scatterlist.h>
	#else
	#define MAX_ORDER 1
	#endif

	typedef struct abd_stats {
	kstat_named_t abdstat_struct_size;
	kstat_named_t abdstat_linear_cnt;
	kstat_named_t abdstat_linear_data_size;
	kstat_named_t abdstat_scatter_cnt;
	kstat_named_t abdstat_scatter_data_size;
	kstat_named_t abdstat_scatter_chunk_waste;
	kstat_named_t abdstat_scatter_orders[MAX_ORDER];
	kstat_named_t abdstat_scatter_page_multi_chunk;
	kstat_named_t abdstat_scatter_page_multi_zone;
	kstat_named_t abdstat_scatter_page_alloc_retry;
	kstat_named_t abdstat_scatter_sg_table_retry;
	} abd_stats_t;

	static abd_stats_t abd_stats = {
	/* Amount of memory occupied by all of the abd_t struct allocations */
	{ "struct_size", KSTAT_DATA_UINT64 },
	/*
	* The number of linear ABDs which are currently allocated, excluding
	* ABDs which don't own their data (for instance the ones which were
	* allocated through abd_get_offset() and abd_get_from_buf()). If an
	* ABD takes ownership of its buf then it will become tracked.
	*/
	{ "linear_cnt", KSTAT_DATA_UINT64 },
	/* Amount of data stored in all linear ABDs tracked by linear_cnt */
	{ "linear_data_size", KSTAT_DATA_UINT64 },
	/*
	* The number of scatter ABDs which are currently allocated, excluding
	* ABDs which don't own their data (for instance the ones which were
	* allocated through abd_get_offset()).
	*/
	{ "scatter_cnt", KSTAT_DATA_UINT64 },
	/* Amount of data stored in all scatter ABDs tracked by scatter_cnt */
	{ "scatter_data_size", KSTAT_DATA_UINT64 },
	/*
	* The amount of space wasted at the end of the last chunk across all
	* scatter ABDs tracked by scatter_cnt.
	*/
	{ "scatter_chunk_waste", KSTAT_DATA_UINT64 },
	/*
	* The number of compound allocations of a given order. These
	* allocations are spread over all currently allocated ABDs, and
	* act as a measure of memory fragmentation.
	*/
	{ { "scatter_order_N", KSTAT_DATA_UINT64 } },
	/*
	* The number of scatter ABDs which contain multiple chunks.
	* ABDs are preferentially allocated from the minimum number of
	* contiguous multi-page chunks, a single chunk is optimal.
	*/
	{ "scatter_page_multi_chunk", KSTAT_DATA_UINT64 },
	/*
	* The number of scatter ABDs which are split across memory zones.
	* ABDs are preferentially allocated using pages from a single zone.
	*/
	{ "scatter_page_multi_zone", KSTAT_DATA_UINT64 },
	/*
	* The total number of retries encountered when attempting to
	* allocate the pages to populate the scatter ABD.
	*/
	{ "scatter_page_alloc_retry", KSTAT_DATA_UINT64 },
	/*
	* The total number of retries encountered when attempting to
	* allocate the sg table for an ABD.
	*/
	{ "scatter_sg_table_retry", KSTAT_DATA_UINT64 },
	};

	struct {
	wmsum_t abdstat_struct_size;
	wmsum_t abdstat_linear_cnt;
	wmsum_t abdstat_linear_data_size;
	wmsum_t abdstat_scatter_cnt;
	wmsum_t abdstat_scatter_data_size;
	wmsum_t abdstat_scatter_chunk_waste;
	wmsum_t abdstat_scatter_orders[MAX_ORDER];
	wmsum_t abdstat_scatter_page_multi_chunk;
	wmsum_t abdstat_scatter_page_multi_zone;
	wmsum_t abdstat_scatter_page_alloc_retry;
	wmsum_t abdstat_scatter_sg_table_retry;
	} abd_sums;

	#define abd_for_each_sg(abd, sg, n, i) \
	for_each_sg(ABD_SCATTER(abd).abd_sgl, sg, n, i)

	unsigned zfs_abd_scatter_max_order = MAX_ORDER - 1;

	/*
	* zfs_abd_scatter_min_size is the minimum allocation size to use scatter
	* ABD's. Smaller allocations will use linear ABD's which uses
	* zio_[data_]buf_alloc().
	*
	* Scatter ABD's use at least one page each, so sub-page allocations waste
	* some space when allocated as scatter (e.g. 2KB scatter allocation wastes
	* half of each page). Using linear ABD's for small allocations means that
	* they will be put on slabs which contain many allocations. This can
	* improve memory efficiency, but it also makes it much harder for ARC
	* evictions to actually free pages, because all the buffers on one slab need
	* to be freed in order for the slab (and underlying pages) to be freed.
	* Typically, 512B and 1KB kmem caches have 16 buffers per slab, so it's
	* possible for them to actually waste more memory than scatter (one page per
	* buf = wasting 3/4 or 7/8th; one buf per slab = wasting 15/16th).
	*
	* Spill blocks are typically 512B and are heavily used on systems running
	* selinux with the default dnode size and the `xattr=sa` property set.
	*
	* By default we use linear allocations for 512B and 1KB, and scatter
	* allocations for larger (1.5KB and up).
	*/
	int zfs_abd_scatter_min_size = 512 * 3;

	/*
	* We use a scattered SPA_MAXBLOCKSIZE sized ABD whose pages are
	* just a single zero'd page. This allows us to conserve memory by
	* only using a single zero page for the scatterlist.
	*/
	abd_t *abd_zero_scatter = NULL;

	struct page;
	/*
	* abd_zero_page we will be an allocated zero'd PAGESIZE buffer, which is
	* assigned to set each of the pages of abd_zero_scatter.
	*/
	static struct page *abd_zero_page = NULL;

	static kmem_cache_t *abd_cache = NULL;
	static kstat_t *abd_ksp;

	static uint_t
	abd_chunkcnt_for_bytes(size_t size)
	{
	return (P2ROUNDUP(size, PAGESIZE) / PAGESIZE);
	}

	abd_t *
	abd_alloc_struct_impl(size_t size)
	{
	/*
	* In Linux we do not use the size passed in during ABD
	* allocation, so we just ignore it.
	*/
	abd_t *abd = kmem_cache_alloc(abd_cache, KM_PUSHPAGE);
	ASSERT3P(abd, !=, NULL);
	ABDSTAT_INCR(abdstat_struct_size, sizeof (abd_t));

	return (abd);
	}

	void
	abd_free_struct_impl(abd_t *abd)
	{
	kmem_cache_free(abd_cache, abd);
	ABDSTAT_INCR(abdstat_struct_size, -(int)sizeof (abd_t));
	}

	#ifdef _KERNEL
	/*
	* Mark zfs data pages so they can be excluded from kernel crash dumps
	*/
	#ifdef _LP64
	#define ABD_FILE_CACHE_PAGE 0x2F5ABDF11ECAC4E

	static inline void
	abd_mark_zfs_page(struct page *page)
	{
	get_page(page);
	SetPagePrivate(page);
	set_page_private(page, ABD_FILE_CACHE_PAGE);
	}

	static inline void
	abd_unmark_zfs_page(struct page *page)
	{
	set_page_private(page, 0UL);
	ClearPagePrivate(page);
	put_page(page);
	}
	#else
	#define abd_mark_zfs_page(page)
	#define abd_unmark_zfs_page(page)
	#endif /* _LP64 */

	#ifndef CONFIG_HIGHMEM

	#ifndef __GFP_RECLAIM
	#define __GFP_RECLAIM __GFP_WAIT
	#endif

	/*
	* The goal is to minimize fragmentation by preferentially populating ABDs
	* with higher order compound pages from a single zone. Allocation size is
	* progressively decreased until it can be satisfied without performing
	* reclaim or compaction. When necessary this function will degenerate to
	* allocating individual pages and allowing reclaim to satisfy allocations.
	*/
	void
	abd_alloc_chunks(abd_t *abd, size_t size)
	{
	struct list_head pages;
	struct sg_table table;
	struct scatterlist *sg;
	struct page page, tmp_page = NULL;
	gfp_t gfp = __GFP_NOWARN \| GFP_NOIO;
	gfp_t gfp_comp = (gfp \| __GFP_NORETRY \| __GFP_COMP) & ~__GFP_RECLAIM;
	int max_order = MIN(zfs_abd_scatter_max_order, MAX_ORDER - 1);
	int nr_pages = abd_chunkcnt_for_bytes(size);
	int chunks = 0, zones = 0;
	size_t remaining_size;
	int nid = NUMA_NO_NODE;
	int alloc_pages = 0;

	INIT_LIST_HEAD(&pages);

	while (alloc_pages < nr_pages) {
	unsigned chunk_pages;
	int order;

	order = MIN(highbit64(nr_pages - alloc_pages) - 1, max_order);
	chunk_pages = (1U << order);

	page = alloc_pages_node(nid, order ? gfp_comp : gfp, order);
	if (page == NULL) {
	if (order == 0) {
	ABDSTAT_BUMP(abdstat_scatter_page_alloc_retry);
	schedule_timeout_interruptible(1);
	} else {
	max_order = MAX(0, order - 1);
	}
	continue;
	}

	list_add_tail(&page->lru, &pages);

	if ((nid != NUMA_NO_NODE) && (page_to_nid(page) != nid))
	zones++;

	nid = page_to_nid(page);
	ABDSTAT_BUMP(abdstat_scatter_orders[order]);
	chunks++;
	alloc_pages += chunk_pages;
	}

	ASSERT3S(alloc_pages, ==, nr_pages);

	while (sg_alloc_table(&table, chunks, gfp)) {
	ABDSTAT_BUMP(abdstat_scatter_sg_table_retry);
	schedule_timeout_interruptible(1);
	}

	sg = table.sgl;
	remaining_size = size;
	list_for_each_entry_safe(page, tmp_page, &pages, lru) {
	size_t sg_size = MIN(PAGESIZE << compound_order(page),
	remaining_size);
	sg_set_page(sg, page, sg_size, 0);
	abd_mark_zfs_page(page);
	remaining_size -= sg_size;

	sg = sg_next(sg);
	list_del(&page->lru);
	}

	/*
	* These conditions ensure that a possible transformation to a linear
	* ABD would be valid.
	*/
	ASSERT(!PageHighMem(sg_page(table.sgl)));
	ASSERT0(ABD_SCATTER(abd).abd_offset);

	if (table.nents == 1) {
	/*
	* Since there is only one entry, this ABD can be represented
	* as a linear buffer. All single-page (4K) ABD's can be
	* represented this way. Some multi-page ABD's can also be
	* represented this way, if we were able to allocate a single
	* "chunk" (higher-order "page" which represents a power-of-2
	* series of physically-contiguous pages). This is often the
	* case for 2-page (8K) ABD's.
	*
	* Representing a single-entry scatter ABD as a linear ABD
	* has the performance advantage of avoiding the copy (and
	* allocation) in abd_borrow_buf_copy / abd_return_buf_copy.
	* A performance increase of around 5% has been observed for
	* ARC-cached reads (of small blocks which can take advantage
	* of this).
	*
	* Note that this optimization is only possible because the
	* pages are always mapped into the kernel's address space.
	* This is not the case for highmem pages, so the
	* optimization can not be made there.
	*/
	abd->abd_flags \|= ABD_FLAG_LINEAR;
	abd->abd_flags \|= ABD_FLAG_LINEAR_PAGE;
	abd->abd_u.abd_linear.abd_sgl = table.sgl;
	ABD_LINEAR_BUF(abd) = page_address(sg_page(table.sgl));
	} else if (table.nents > 1) {
	ABDSTAT_BUMP(abdstat_scatter_page_multi_chunk);
	abd->abd_flags \|= ABD_FLAG_MULTI_CHUNK;

	if (zones) {
	ABDSTAT_BUMP(abdstat_scatter_page_multi_zone);
	abd->abd_flags \|= ABD_FLAG_MULTI_ZONE;
	}

	ABD_SCATTER(abd).abd_sgl = table.sgl;
	ABD_SCATTER(abd).abd_nents = table.nents;
	}
	}
	#else

	/*
	* Allocate N individual pages to construct a scatter ABD. This function
	* makes no attempt to request contiguous pages and requires the minimal
	* number of kernel interfaces. It's designed for maximum compatibility.
	*/
	void
	abd_alloc_chunks(abd_t *abd, size_t size)
	{
	struct scatterlist *sg = NULL;
	struct sg_table table;
	struct page *page;
	gfp_t gfp = __GFP_NOWARN \| GFP_NOIO;
	int nr_pages = abd_chunkcnt_for_bytes(size);
	int i = 0;

	while (sg_alloc_table(&table, nr_pages, gfp)) {
	ABDSTAT_BUMP(abdstat_scatter_sg_table_retry);
	schedule_timeout_interruptible(1);
	}

	ASSERT3U(table.nents, ==, nr_pages);
	ABD_SCATTER(abd).abd_sgl = table.sgl;
	ABD_SCATTER(abd).abd_nents = nr_pages;

	abd_for_each_sg(abd, sg, nr_pages, i) {
	while ((page = __page_cache_alloc(gfp)) == NULL) {
	ABDSTAT_BUMP(abdstat_scatter_page_alloc_retry);
	schedule_timeout_interruptible(1);
	}

	ABDSTAT_BUMP(abdstat_scatter_orders[0]);
	sg_set_page(sg, page, PAGESIZE, 0);
	abd_mark_zfs_page(page);
	}

	if (nr_pages > 1) {
	ABDSTAT_BUMP(abdstat_scatter_page_multi_chunk);
	abd->abd_flags \|= ABD_FLAG_MULTI_CHUNK;
	}
	}
	#endif /* !CONFIG_HIGHMEM */

	/*
	* This must be called if any of the sg_table allocation functions
	* are called.
	*/
	static void
	abd_free_sg_table(abd_t *abd)
	{
	struct sg_table table;

	table.sgl = ABD_SCATTER(abd).abd_sgl;
	table.nents = table.orig_nents = ABD_SCATTER(abd).abd_nents;
	sg_free_table(&table);
	}

	void
	abd_free_chunks(abd_t *abd)
	{
	struct scatterlist *sg = NULL;
	struct page *page;
	int nr_pages = ABD_SCATTER(abd).abd_nents;
	int order, i = 0;

	if (abd->abd_flags & ABD_FLAG_MULTI_ZONE)
	ABDSTAT_BUMPDOWN(abdstat_scatter_page_multi_zone);

	if (abd->abd_flags & ABD_FLAG_MULTI_CHUNK)
	ABDSTAT_BUMPDOWN(abdstat_scatter_page_multi_chunk);

	abd_for_each_sg(abd, sg, nr_pages, i) {
	page = sg_page(sg);
	abd_unmark_zfs_page(page);
	order = compound_order(page);
	__free_pages(page, order);
	ASSERT3U(sg->length, <=, PAGE_SIZE << order);
	ABDSTAT_BUMPDOWN(abdstat_scatter_orders[order]);
	}
	abd_free_sg_table(abd);
	}

	/*
	* Allocate scatter ABD of size SPA_MAXBLOCKSIZE, where each page in
	* the scatterlist will be set to the zero'd out buffer abd_zero_page.
	*/
	static void
	abd_alloc_zero_scatter(void)
	{
	struct scatterlist *sg = NULL;
	struct sg_table table;
	gfp_t gfp = __GFP_NOWARN \| GFP_NOIO;
	gfp_t gfp_zero_page = gfp \| __GFP_ZERO;
	int nr_pages = abd_chunkcnt_for_bytes(SPA_MAXBLOCKSIZE);
	int i = 0;

	while ((abd_zero_page = __page_cache_alloc(gfp_zero_page)) == NULL) {
	ABDSTAT_BUMP(abdstat_scatter_page_alloc_retry);
	schedule_timeout_interruptible(1);
	}
	abd_mark_zfs_page(abd_zero_page);

	while (sg_alloc_table(&table, nr_pages, gfp)) {
	ABDSTAT_BUMP(abdstat_scatter_sg_table_retry);
	schedule_timeout_interruptible(1);
	}
	ASSERT3U(table.nents, ==, nr_pages);

	abd_zero_scatter = abd_alloc_struct(SPA_MAXBLOCKSIZE);
	abd_zero_scatter->abd_flags \|= ABD_FLAG_OWNER;
	ABD_SCATTER(abd_zero_scatter).abd_offset = 0;
	ABD_SCATTER(abd_zero_scatter).abd_sgl = table.sgl;
	ABD_SCATTER(abd_zero_scatter).abd_nents = nr_pages;
	abd_zero_scatter->abd_size = SPA_MAXBLOCKSIZE;
	abd_zero_scatter->abd_flags \|= ABD_FLAG_MULTI_CHUNK \| ABD_FLAG_ZEROS;

	abd_for_each_sg(abd_zero_scatter, sg, nr_pages, i) {
	sg_set_page(sg, abd_zero_page, PAGESIZE, 0);
	}

	ABDSTAT_BUMP(abdstat_scatter_cnt);
	ABDSTAT_INCR(abdstat_scatter_data_size, PAGESIZE);
	ABDSTAT_BUMP(abdstat_scatter_page_multi_chunk);
	}

	#else /* _KERNEL */

	#ifndef PAGE_SHIFT
	#define PAGE_SHIFT (highbit64(PAGESIZE)-1)
	#endif

	#define zfs_kmap_atomic(chunk) ((void *)chunk)
	#define zfs_kunmap_atomic(addr) do { (void)(addr); } while (0)
	#define local_irq_save(flags) do { (void)(flags); } while (0)
	#define local_irq_restore(flags) do { (void)(flags); } while (0)
	#define nth_page(pg, i) \
	((struct page )((void )(pg) + (i) * PAGESIZE))

	struct scatterlist {
	struct page *page;
	int length;
	int end;
	};

	static void
	sg_init_table(struct scatterlist *sg, int nr)
	{
	memset(sg, 0, nr * sizeof (struct scatterlist));
	sg[nr - 1].end = 1;
	}

	/*
	* This must be called if any of the sg_table allocation functions
	* are called.
	*/
	static void
	abd_free_sg_table(abd_t *abd)
	{
	int nents = ABD_SCATTER(abd).abd_nents;
	vmem_free(ABD_SCATTER(abd).abd_sgl,
	nents * sizeof (struct scatterlist));
	}

	#define for_each_sg(sgl, sg, nr, i) \
	for ((i) = 0, (sg) = (sgl); (i) < (nr); (i)++, (sg) = sg_next(sg))

	static inline void
	sg_set_page(struct scatterlist sg, struct page page, unsigned int len,
	unsigned int offset)
	{
	/* currently we don't use offset */
	ASSERT(offset == 0);
	sg->page = page;
	sg->length = len;
	}

	static inline struct page *
	sg_page(struct scatterlist *sg)
	{
	return (sg->page);
	}

	static inline struct scatterlist *
	sg_next(struct scatterlist *sg)
	{
	if (sg->end)
	return (NULL);

	return (sg + 1);
	}

	void
	abd_alloc_chunks(abd_t *abd, size_t size)
	{
	unsigned nr_pages = abd_chunkcnt_for_bytes(size);
	struct scatterlist *sg;
	int i;

	ABD_SCATTER(abd).abd_sgl = vmem_alloc(nr_pages *
	sizeof (struct scatterlist), KM_SLEEP);
	sg_init_table(ABD_SCATTER(abd).abd_sgl, nr_pages);

	abd_for_each_sg(abd, sg, nr_pages, i) {
	struct page *p = umem_alloc_aligned(PAGESIZE, 64, KM_SLEEP);
	sg_set_page(sg, p, PAGESIZE, 0);
	}
	ABD_SCATTER(abd).abd_nents = nr_pages;
	}

	void
	abd_free_chunks(abd_t *abd)
	{
	int i, n = ABD_SCATTER(abd).abd_nents;
	struct scatterlist *sg;

	abd_for_each_sg(abd, sg, n, i) {
	for (int j = 0; j < sg->length; j += PAGESIZE) {
	struct page *p = nth_page(sg_page(sg), j >> PAGE_SHIFT);
	umem_free(p, PAGESIZE);
	}
	}
	abd_free_sg_table(abd);
	}

	static void
	abd_alloc_zero_scatter(void)
	{
	unsigned nr_pages = abd_chunkcnt_for_bytes(SPA_MAXBLOCKSIZE);
	struct scatterlist *sg;
	int i;

	abd_zero_page = umem_alloc_aligned(PAGESIZE, 64, KM_SLEEP);
	memset(abd_zero_page, 0, PAGESIZE);
	abd_zero_scatter = abd_alloc_struct(SPA_MAXBLOCKSIZE);
	abd_zero_scatter->abd_flags \|= ABD_FLAG_OWNER;
	abd_zero_scatter->abd_flags \|= ABD_FLAG_MULTI_CHUNK \| ABD_FLAG_ZEROS;
	ABD_SCATTER(abd_zero_scatter).abd_offset = 0;
	ABD_SCATTER(abd_zero_scatter).abd_nents = nr_pages;
	abd_zero_scatter->abd_size = SPA_MAXBLOCKSIZE;
	zfs_refcount_create(&abd_zero_scatter->abd_children);
	ABD_SCATTER(abd_zero_scatter).abd_sgl = vmem_alloc(nr_pages *
	sizeof (struct scatterlist), KM_SLEEP);

	sg_init_table(ABD_SCATTER(abd_zero_scatter).abd_sgl, nr_pages);

	abd_for_each_sg(abd_zero_scatter, sg, nr_pages, i) {
	sg_set_page(sg, abd_zero_page, PAGESIZE, 0);
	}

	ABDSTAT_BUMP(abdstat_scatter_cnt);
	ABDSTAT_INCR(abdstat_scatter_data_size, PAGESIZE);
	ABDSTAT_BUMP(abdstat_scatter_page_multi_chunk);
	}

	#endif /* _KERNEL */

	boolean_t
	abd_size_alloc_linear(size_t size)
	{
	return (size < zfs_abd_scatter_min_size ? B_TRUE : B_FALSE);
	}

	void
	abd_update_scatter_stats(abd_t *abd, abd_stats_op_t op)
	{
	ASSERT(op == ABDSTAT_INCR \|\| op == ABDSTAT_DECR);
	int waste = P2ROUNDUP(abd->abd_size, PAGESIZE) - abd->abd_size;
	if (op == ABDSTAT_INCR) {
	ABDSTAT_BUMP(abdstat_scatter_cnt);
	ABDSTAT_INCR(abdstat_scatter_data_size, abd->abd_size);
	ABDSTAT_INCR(abdstat_scatter_chunk_waste, waste);
	arc_space_consume(waste, ARC_SPACE_ABD_CHUNK_WASTE);
	} else {
	ABDSTAT_BUMPDOWN(abdstat_scatter_cnt);
	ABDSTAT_INCR(abdstat_scatter_data_size, -(int)abd->abd_size);
	ABDSTAT_INCR(abdstat_scatter_chunk_waste, -waste);
	arc_space_return(waste, ARC_SPACE_ABD_CHUNK_WASTE);
	}
	}

	void
	abd_update_linear_stats(abd_t *abd, abd_stats_op_t op)
	{
	ASSERT(op == ABDSTAT_INCR \|\| op == ABDSTAT_DECR);
	if (op == ABDSTAT_INCR) {
	ABDSTAT_BUMP(abdstat_linear_cnt);
	ABDSTAT_INCR(abdstat_linear_data_size, abd->abd_size);
	} else {
	ABDSTAT_BUMPDOWN(abdstat_linear_cnt);
	ABDSTAT_INCR(abdstat_linear_data_size, -(int)abd->abd_size);
	}
	}

	void
	abd_verify_scatter(abd_t *abd)
	{
	size_t n;
	int i = 0;
	struct scatterlist *sg = NULL;

	ASSERT3U(ABD_SCATTER(abd).abd_nents, >, 0);
	ASSERT3U(ABD_SCATTER(abd).abd_offset, <,
	ABD_SCATTER(abd).abd_sgl->length);
	n = ABD_SCATTER(abd).abd_nents;
	abd_for_each_sg(abd, sg, n, i) {
	ASSERT3P(sg_page(sg), !=, NULL);
	}
	}

	static void
	abd_free_zero_scatter(void)
	{
	ABDSTAT_BUMPDOWN(abdstat_scatter_cnt);
	ABDSTAT_INCR(abdstat_scatter_data_size, -(int)PAGESIZE);
	ABDSTAT_BUMPDOWN(abdstat_scatter_page_multi_chunk);

	abd_free_sg_table(abd_zero_scatter);
	abd_free_struct(abd_zero_scatter);
	abd_zero_scatter = NULL;
	ASSERT3P(abd_zero_page, !=, NULL);
	#if defined(_KERNEL)
	abd_unmark_zfs_page(abd_zero_page);
	__free_page(abd_zero_page);
	#else
	umem_free(abd_zero_page, PAGESIZE);
	#endif /* _KERNEL */
	}

	static int
	abd_kstats_update(kstat_t *ksp, int rw)
	{
	abd_stats_t *as = ksp->ks_data;

	if (rw == KSTAT_WRITE)
	return (EACCES);
	as->abdstat_struct_size.value.ui64 =
	wmsum_value(&abd_sums.abdstat_struct_size);
	as->abdstat_linear_cnt.value.ui64 =
	wmsum_value(&abd_sums.abdstat_linear_cnt);
	as->abdstat_linear_data_size.value.ui64 =
	wmsum_value(&abd_sums.abdstat_linear_data_size);
	as->abdstat_scatter_cnt.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_cnt);
	as->abdstat_scatter_data_size.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_data_size);
	as->abdstat_scatter_chunk_waste.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_chunk_waste);
	for (int i = 0; i < MAX_ORDER; i++) {
	as->abdstat_scatter_orders[i].value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_orders[i]);
	}
	as->abdstat_scatter_page_multi_chunk.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_page_multi_chunk);
	as->abdstat_scatter_page_multi_zone.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_page_multi_zone);
	as->abdstat_scatter_page_alloc_retry.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_page_alloc_retry);
	as->abdstat_scatter_sg_table_retry.value.ui64 =
	wmsum_value(&abd_sums.abdstat_scatter_sg_table_retry);
	return (0);
	}

	void
	abd_init(void)
	{
	int i;

	abd_cache = kmem_cache_create("abd_t", sizeof (abd_t),
	0, NULL, NULL, NULL, NULL, NULL, 0);

	wmsum_init(&abd_sums.abdstat_struct_size, 0);
	wmsum_init(&abd_sums.abdstat_linear_cnt, 0);
	wmsum_init(&abd_sums.abdstat_linear_data_size, 0);
	wmsum_init(&abd_sums.abdstat_scatter_cnt, 0);
	wmsum_init(&abd_sums.abdstat_scatter_data_size, 0);
	wmsum_init(&abd_sums.abdstat_scatter_chunk_waste, 0);
	for (i = 0; i < MAX_ORDER; i++)
	wmsum_init(&abd_sums.abdstat_scatter_orders[i], 0);
	wmsum_init(&abd_sums.abdstat_scatter_page_multi_chunk, 0);
	wmsum_init(&abd_sums.abdstat_scatter_page_multi_zone, 0);
	wmsum_init(&abd_sums.abdstat_scatter_page_alloc_retry, 0);
	wmsum_init(&abd_sums.abdstat_scatter_sg_table_retry, 0);

	abd_ksp = kstat_create("zfs", 0, "abdstats", "misc", KSTAT_TYPE_NAMED,
	sizeof (abd_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);
	if (abd_ksp != NULL) {
	for (i = 0; i < MAX_ORDER; i++) {
	snprintf(abd_stats.abdstat_scatter_orders[i].name,
	KSTAT_STRLEN, "scatter_order_%d", i);
	abd_stats.abdstat_scatter_orders[i].data_type =
	KSTAT_DATA_UINT64;
	}
	abd_ksp->ks_data = &abd_stats;
	abd_ksp->ks_update = abd_kstats_update;
	kstat_install(abd_ksp);
	}

	abd_alloc_zero_scatter();
	}

	void
	abd_fini(void)
	{
	abd_free_zero_scatter();

	if (abd_ksp != NULL) {
	kstat_delete(abd_ksp);
	abd_ksp = NULL;
	}

	wmsum_fini(&abd_sums.abdstat_struct_size);
	wmsum_fini(&abd_sums.abdstat_linear_cnt);
	wmsum_fini(&abd_sums.abdstat_linear_data_size);
	wmsum_fini(&abd_sums.abdstat_scatter_cnt);
	wmsum_fini(&abd_sums.abdstat_scatter_data_size);
	wmsum_fini(&abd_sums.abdstat_scatter_chunk_waste);
	for (int i = 0; i < MAX_ORDER; i++)
	wmsum_fini(&abd_sums.abdstat_scatter_orders[i]);
	wmsum_fini(&abd_sums.abdstat_scatter_page_multi_chunk);
	wmsum_fini(&abd_sums.abdstat_scatter_page_multi_zone);
	wmsum_fini(&abd_sums.abdstat_scatter_page_alloc_retry);
	wmsum_fini(&abd_sums.abdstat_scatter_sg_table_retry);

	if (abd_cache) {
	kmem_cache_destroy(abd_cache);
	abd_cache = NULL;
	}
	}

	void
	abd_free_linear_page(abd_t *abd)
	{
	/* Transform it back into a scatter ABD for freeing */
	struct scatterlist *sg = abd->abd_u.abd_linear.abd_sgl;
	abd->abd_flags &= ~ABD_FLAG_LINEAR;
	abd->abd_flags &= ~ABD_FLAG_LINEAR_PAGE;
	ABD_SCATTER(abd).abd_nents = 1;
	ABD_SCATTER(abd).abd_offset = 0;
	ABD_SCATTER(abd).abd_sgl = sg;
	abd_free_chunks(abd);

	abd_update_scatter_stats(abd, ABDSTAT_DECR);
	}

	/*
	* If we're going to use this ABD for doing I/O using the block layer, the
	* consumer of the ABD data doesn't care if it's scattered or not, and we don't
	* plan to store this ABD in memory for a long period of time, we should
	* allocate the ABD type that requires the least data copying to do the I/O.
	*
	* On Linux the optimal thing to do would be to use abd_get_offset() and
	* construct a new ABD which shares the original pages thereby eliminating
	* the copy. But for the moment a new linear ABD is allocated until this
	* performance optimization can be implemented.
	*/
	abd_t *
	abd_alloc_for_io(size_t size, boolean_t is_metadata)
	{
	return (abd_alloc(size, is_metadata));
	}

	abd_t *
	-abd_get_offset_scatter(abd_t abd, abd_t sabd, size_t off)
	+abd_get_offset_scatter(abd_t abd, abd_t sabd, size_t off,
	+ size_t size)
	{
	int i = 0;
	struct scatterlist *sg = NULL;

	abd_verify(sabd);
	ASSERT3U(off, <=, sabd->abd_size);

	size_t new_offset = ABD_SCATTER(sabd).abd_offset + off;

	if (abd == NULL)
	abd = abd_alloc_struct(0);

	/*
	* Even if this buf is filesystem metadata, we only track that
	* if we own the underlying data buffer, which is not true in
	* this case. Therefore, we don't ever use ABD_FLAG_META here.
	*/

	abd_for_each_sg(sabd, sg, ABD_SCATTER(sabd).abd_nents, i) {
	if (new_offset < sg->length)
	break;
	new_offset -= sg->length;
	}

	ABD_SCATTER(abd).abd_sgl = sg;
	ABD_SCATTER(abd).abd_offset = new_offset;
	ABD_SCATTER(abd).abd_nents = ABD_SCATTER(sabd).abd_nents - i;

	return (abd);
	}

	/*
	* Initialize the abd_iter.
	*/
	void
	abd_iter_init(struct abd_iter aiter, abd_t abd)
	{
	ASSERT(!abd_is_gang(abd));
	abd_verify(abd);
	aiter->iter_abd = abd;
	aiter->iter_mapaddr = NULL;
	aiter->iter_mapsize = 0;
	aiter->iter_pos = 0;
	if (abd_is_linear(abd)) {
	aiter->iter_offset = 0;
	aiter->iter_sg = NULL;
	} else {
	aiter->iter_offset = ABD_SCATTER(abd).abd_offset;
	aiter->iter_sg = ABD_SCATTER(abd).abd_sgl;
	}
	}

	/*
	* This is just a helper function to see if we have exhausted the
	* abd_iter and reached the end.
	*/
	boolean_t
	abd_iter_at_end(struct abd_iter *aiter)
	{
	return (aiter->iter_pos == aiter->iter_abd->abd_size);
	}

	/*
	* Advance the iterator by a certain amount. Cannot be called when a chunk is
	* in use. This can be safely called when the aiter has already exhausted, in
	* which case this does nothing.
	*/
	void
	abd_iter_advance(struct abd_iter *aiter, size_t amount)
	{
	ASSERT3P(aiter->iter_mapaddr, ==, NULL);
	ASSERT0(aiter->iter_mapsize);

	/* There's nothing left to advance to, so do nothing */
	if (abd_iter_at_end(aiter))
	return;

	aiter->iter_pos += amount;
	aiter->iter_offset += amount;
	if (!abd_is_linear(aiter->iter_abd)) {
	while (aiter->iter_offset >= aiter->iter_sg->length) {
	aiter->iter_offset -= aiter->iter_sg->length;
	aiter->iter_sg = sg_next(aiter->iter_sg);
	if (aiter->iter_sg == NULL) {
	ASSERT0(aiter->iter_offset);
	break;
	}
	}
	}
	}

	/*
	* Map the current chunk into aiter. This can be safely called when the aiter
	* has already exhausted, in which case this does nothing.
	*/
	void
	abd_iter_map(struct abd_iter *aiter)
	{
	void *paddr;
	size_t offset = 0;

	ASSERT3P(aiter->iter_mapaddr, ==, NULL);
	ASSERT0(aiter->iter_mapsize);

	/* There's nothing left to iterate over, so do nothing */
	if (abd_iter_at_end(aiter))
	return;

	if (abd_is_linear(aiter->iter_abd)) {
	ASSERT3U(aiter->iter_pos, ==, aiter->iter_offset);
	offset = aiter->iter_offset;
	aiter->iter_mapsize = aiter->iter_abd->abd_size - offset;
	paddr = ABD_LINEAR_BUF(aiter->iter_abd);
	} else {
	offset = aiter->iter_offset;
	aiter->iter_mapsize = MIN(aiter->iter_sg->length - offset,
	aiter->iter_abd->abd_size - aiter->iter_pos);

	paddr = zfs_kmap_atomic(sg_page(aiter->iter_sg));
	}

	aiter->iter_mapaddr = (char *)paddr + offset;
	}

	/*
	* Unmap the current chunk from aiter. This can be safely called when the aiter
	* has already exhausted, in which case this does nothing.
	*/
	void
	abd_iter_unmap(struct abd_iter *aiter)
	{
	/* There's nothing left to unmap, so do nothing */
	if (abd_iter_at_end(aiter))
	return;

	if (!abd_is_linear(aiter->iter_abd)) {
	/* LINTED E_FUNC_SET_NOT_USED */
	zfs_kunmap_atomic(aiter->iter_mapaddr - aiter->iter_offset);
	}

	ASSERT3P(aiter->iter_mapaddr, !=, NULL);
	ASSERT3U(aiter->iter_mapsize, >, 0);

	aiter->iter_mapaddr = NULL;
	aiter->iter_mapsize = 0;
	}

	void
	abd_cache_reap_now(void)
	{
	}

	#if defined(_KERNEL)
	/*
	* bio_nr_pages for ABD.
	* @off is the offset in @abd
	*/
	unsigned long
	abd_nr_pages_off(abd_t *abd, unsigned int size, size_t off)
	{
	unsigned long pos;

	if (abd_is_gang(abd)) {
	unsigned long count = 0;

	for (abd_t *cabd = abd_gang_get_offset(abd, &off);
	cabd != NULL && size != 0;
	cabd = list_next(&ABD_GANG(abd).abd_gang_chain, cabd)) {
	ASSERT3U(off, <, cabd->abd_size);
	int mysize = MIN(size, cabd->abd_size - off);
	count += abd_nr_pages_off(cabd, mysize, off);
	size -= mysize;
	off = 0;
	}
	return (count);
	}

	if (abd_is_linear(abd))
	pos = (unsigned long)abd_to_buf(abd) + off;
	else
	pos = ABD_SCATTER(abd).abd_offset + off;

	return (((pos + size + PAGESIZE - 1) >> PAGE_SHIFT) -
	(pos >> PAGE_SHIFT));
	}

	static unsigned int
	bio_map(struct bio bio, void buf_ptr, unsigned int bio_size)
	{
	unsigned int offset, size, i;
	struct page *page;

	offset = offset_in_page(buf_ptr);
	for (i = 0; i < bio->bi_max_vecs; i++) {
	size = PAGE_SIZE - offset;

	if (bio_size <= 0)
	break;

	if (size > bio_size)
	size = bio_size;

	if (is_vmalloc_addr(buf_ptr))
	page = vmalloc_to_page(buf_ptr);
	else
	page = virt_to_page(buf_ptr);

	/*
	* Some network related block device uses tcp_sendpage, which
	* doesn't behave well when using 0-count page, this is a
	* safety net to catch them.
	*/
	ASSERT3S(page_count(page), >, 0);

	if (bio_add_page(bio, page, size, offset) != size)
	break;

	buf_ptr += size;
	bio_size -= size;
	offset = 0;
	}

	return (bio_size);
	}

	/*
	* bio_map for gang ABD.
	*/
	static unsigned int
	abd_gang_bio_map_off(struct bio bio, abd_t abd,
	unsigned int io_size, size_t off)
	{
	ASSERT(abd_is_gang(abd));

	for (abd_t *cabd = abd_gang_get_offset(abd, &off);
	cabd != NULL;
	cabd = list_next(&ABD_GANG(abd).abd_gang_chain, cabd)) {
	ASSERT3U(off, <, cabd->abd_size);
	int size = MIN(io_size, cabd->abd_size - off);
	int remainder = abd_bio_map_off(bio, cabd, size, off);
	io_size -= (size - remainder);
	if (io_size == 0 \|\| remainder > 0)
	return (io_size);
	off = 0;
	}
	ASSERT0(io_size);
	return (io_size);
	}

	/*
	* bio_map for ABD.
	* @off is the offset in @abd
	* Remaining IO size is returned
	*/
	unsigned int
	abd_bio_map_off(struct bio bio, abd_t abd,
	unsigned int io_size, size_t off)
	{
	struct abd_iter aiter;

	ASSERT3U(io_size, <=, abd->abd_size - off);
	if (abd_is_linear(abd))
	return (bio_map(bio, ((char *)abd_to_buf(abd)) + off, io_size));

	ASSERT(!abd_is_linear(abd));
	if (abd_is_gang(abd))
	return (abd_gang_bio_map_off(bio, abd, io_size, off));

	abd_iter_init(&aiter, abd);
	abd_iter_advance(&aiter, off);

	for (int i = 0; i < bio->bi_max_vecs; i++) {
	struct page *pg;
	size_t len, sgoff, pgoff;
	struct scatterlist *sg;

	if (io_size <= 0)
	break;

	sg = aiter.iter_sg;
	sgoff = aiter.iter_offset;
	pgoff = sgoff & (PAGESIZE - 1);
	len = MIN(io_size, PAGESIZE - pgoff);
	ASSERT(len > 0);

	pg = nth_page(sg_page(sg), sgoff >> PAGE_SHIFT);
	if (bio_add_page(bio, pg, len, pgoff) != len)
	break;

	io_size -= len;
	abd_iter_advance(&aiter, len);
	}

	return (io_size);
	}

	/* Tunable Parameters */
	module_param(zfs_abd_scatter_enabled, int, 0644);
	MODULE_PARM_DESC(zfs_abd_scatter_enabled,
	"Toggle whether ABD allocations must be linear.");
	module_param(zfs_abd_scatter_min_size, int, 0644);
	MODULE_PARM_DESC(zfs_abd_scatter_min_size,
	"Minimum size of scatter allocations.");
	/* CSTYLED */
	module_param(zfs_abd_scatter_max_order, uint, 0644);
	MODULE_PARM_DESC(zfs_abd_scatter_max_order,
	"Maximum order allocation used for a scatter ABD.");
	#endif
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/arc_os.c b/sys/contrib/openzfs/module/os/linux/zfs/arc_os.c
	index b03ad8318d1d..f96cd1271ee5 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/arc_os.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/arc_os.c
	@@ -1,529 +1,541 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2018, Joyent, Inc.
	* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
	* Copyright (c) 2014 by Saso Kiselkov. All rights reserved.
	* Copyright 2017 Nexenta Systems, Inc. All rights reserved.
	*/

	#include <sys/spa.h>
	#include <sys/zio.h>
	#include <sys/spa_impl.h>
	#include <sys/zio_compress.h>
	#include <sys/zio_checksum.h>
	#include <sys/zfs_context.h>
	#include <sys/arc.h>
	#include <sys/zfs_refcount.h>
	#include <sys/vdev.h>
	#include <sys/vdev_trim.h>
	#include <sys/vdev_impl.h>
	#include <sys/dsl_pool.h>
	#include <sys/multilist.h>
	#include <sys/abd.h>
	#include <sys/zil.h>
	#include <sys/fm/fs/zfs.h>
	#ifdef _KERNEL
	#include <sys/shrinker.h>
	#include <sys/vmsystm.h>
	#include <sys/zpl.h>
	#include <linux/page_compat.h>
	#include <linux/notifier.h>
	#include <linux/memory.h>
	#endif
	#include <sys/callb.h>
	#include <sys/kstat.h>
	#include <sys/zthr.h>
	#include <zfs_fletcher.h>
	#include <sys/arc_impl.h>
	#include <sys/trace_zfs.h>
	#include <sys/aggsum.h>

	/*
	* This is a limit on how many pages the ARC shrinker makes available for
	* eviction in response to one page allocation attempt. Note that in
	* practice, the kernel's shrinker can ask us to evict up to about 4x this
	* for one allocation attempt.
	*
	* The default limit of 10,000 (in practice, 160MB per allocation attempt
	* with 4K pages) limits the amount of time spent attempting to reclaim ARC
	* memory to less than 100ms per allocation attempt, even with a small
	* average compressed block size of ~8KB.
	*
	* See also the comment in arc_shrinker_count().
	* Set to 0 to disable limit.
	*/
	int zfs_arc_shrinker_limit = 10000;

	#ifdef CONFIG_MEMORY_HOTPLUG
	static struct notifier_block arc_hotplug_callback_mem_nb;
	#endif

	/*
	* Return a default max arc size based on the amount of physical memory.
	*/
	uint64_t
	arc_default_max(uint64_t min, uint64_t allmem)
	{
	/* Default to 1/2 of all memory. */
	return (MAX(allmem / 2, min));
	}

	#ifdef _KERNEL
	/*
	* Return maximum amount of memory that we could possibly use. Reduced
	* to half of all memory in user space which is primarily used for testing.
	*/
	uint64_t
	arc_all_memory(void)
	{
	#ifdef CONFIG_HIGHMEM
	return (ptob(zfs_totalram_pages - zfs_totalhigh_pages));
	#else
	return (ptob(zfs_totalram_pages));
	#endif /* CONFIG_HIGHMEM */
	}

	/*
	* Return the amount of memory that is considered free. In user space
	* which is primarily used for testing we pretend that free memory ranges
	* from 0-20% of all memory.
	*/
	uint64_t
	arc_free_memory(void)
	{
	#ifdef CONFIG_HIGHMEM
	struct sysinfo si;
	si_meminfo(&si);
	return (ptob(si.freeram - si.freehigh));
	#else
	return (ptob(nr_free_pages() +
	nr_inactive_file_pages()));
	#endif /* CONFIG_HIGHMEM */
	}

	/*
	* Return the amount of memory that can be consumed before reclaim will be
	* needed. Positive if there is sufficient free memory, negative indicates
	* the amount of memory that needs to be freed up.
	*/
	int64_t
	arc_available_memory(void)
	{
	return (arc_free_memory() - arc_sys_free);
	}

	static uint64_t
	arc_evictable_memory(void)
	{
	int64_t asize = aggsum_value(&arc_sums.arcstat_size);
	uint64_t arc_clean =
	zfs_refcount_count(&arc_mru->arcs_esize[ARC_BUFC_DATA]) +
	zfs_refcount_count(&arc_mru->arcs_esize[ARC_BUFC_METADATA]) +
	zfs_refcount_count(&arc_mfu->arcs_esize[ARC_BUFC_DATA]) +
	zfs_refcount_count(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
	uint64_t arc_dirty = MAX((int64_t)asize - (int64_t)arc_clean, 0);

	/*
	* Scale reported evictable memory in proportion to page cache, cap
	* at specified min/max.
	*/
	uint64_t min = (ptob(nr_file_pages()) / 100) * zfs_arc_pc_percent;
	min = MAX(arc_c_min, MIN(arc_c_max, min));

	if (arc_dirty >= min)
	return (arc_clean);

	return (MAX((int64_t)asize - (int64_t)min, 0));
	}

	/*
	* The _count() function returns the number of free-able objects.
	* The _scan() function returns the number of objects that were freed.
	*/
	static unsigned long
	arc_shrinker_count(struct shrinker shrink, struct shrink_control sc)
	{
	/*
	* __GFP_FS won't be set if we are called from ZFS code (see
	* kmem_flags_convert(), which removes it). To avoid a deadlock, we
	* don't allow evicting in this case. We return 0 rather than
	* SHRINK_STOP so that the shrinker logic doesn't accumulate a
	* deficit against us.
	*/
	if (!(sc->gfp_mask & __GFP_FS)) {
	return (0);
	}

	/*
	* This code is reached in the "direct reclaim" case, where the
	* kernel (outside ZFS) is trying to allocate a page, and the system
	* is low on memory.
	*
	* The kernel's shrinker code doesn't understand how many pages the
	* ARC's callback actually frees, so it may ask the ARC to shrink a
	* lot for one page allocation. This is problematic because it may
	* take a long time, thus delaying the page allocation, and because
	* it may force the ARC to unnecessarily shrink very small.
	*
	* Therefore, we limit the amount of data that we say is evictable,
	* which limits the amount that the shrinker will ask us to evict for
	* one page allocation attempt.
	*
	* In practice, we may be asked to shrink 4x the limit to satisfy one
	* page allocation, before the kernel's shrinker code gives up on us.
	* When that happens, we rely on the kernel code to find the pages
	* that we freed before invoking the OOM killer. This happens in
	* __alloc_pages_slowpath(), which retries and finds the pages we
	* freed when it calls get_page_from_freelist().
	*
	* See also the comment above zfs_arc_shrinker_limit.
	*/
	int64_t limit = zfs_arc_shrinker_limit != 0 ?
	zfs_arc_shrinker_limit : INT64_MAX;
	return (MIN(limit, btop((int64_t)arc_evictable_memory())));
	}

	static unsigned long
	arc_shrinker_scan(struct shrinker shrink, struct shrink_control sc)
	{
	ASSERT((sc->gfp_mask & __GFP_FS) != 0);

	/* The arc is considered warm once reclaim has occurred */
	if (unlikely(arc_warm == B_FALSE))
	arc_warm = B_TRUE;

	/*
	* Evict the requested number of pages by reducing arc_c and waiting
	* for the requested amount of data to be evicted.
	*/
	arc_reduce_target_size(ptob(sc->nr_to_scan));
	- arc_wait_for_eviction(ptob(sc->nr_to_scan));
	+ arc_wait_for_eviction(ptob(sc->nr_to_scan), B_FALSE);
	if (current->reclaim_state != NULL)
	current->reclaim_state->reclaimed_slab += sc->nr_to_scan;

	/*
	* We are experiencing memory pressure which the arc_evict_zthr was
	* unable to keep up with. Set arc_no_grow to briefly pause arc
	* growth to avoid compounding the memory pressure.
	*/
	arc_no_grow = B_TRUE;

	/*
	* When direct reclaim is observed it usually indicates a rapid
	* increase in memory pressure. This occurs because the kswapd
	* threads were unable to asynchronously keep enough free memory
	* available.
	*/
	if (current_is_kswapd()) {
	ARCSTAT_BUMP(arcstat_memory_indirect_count);
	} else {
	ARCSTAT_BUMP(arcstat_memory_direct_count);
	}

	return (sc->nr_to_scan);
	}

	SPL_SHRINKER_DECLARE(arc_shrinker,
	arc_shrinker_count, arc_shrinker_scan, DEFAULT_SEEKS);

	int
	arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg)
	{
	uint64_t free_memory = arc_free_memory();

	if (free_memory > arc_all_memory() * arc_lotsfree_percent / 100)
	return (0);

	if (txg > spa->spa_lowmem_last_txg) {
	spa->spa_lowmem_last_txg = txg;
	spa->spa_lowmem_page_load = 0;
	}
	/*
	* If we are in pageout, we know that memory is already tight,
	* the arc is already going to be evicting, so we just want to
	* continue to let page writes occur as quickly as possible.
	*/
	if (current_is_kswapd()) {
	if (spa->spa_lowmem_page_load >
	MAX(arc_sys_free / 4, free_memory) / 4) {
	DMU_TX_STAT_BUMP(dmu_tx_memory_reclaim);
	return (SET_ERROR(ERESTART));
	}
	/* Note: reserve is inflated, so we deflate */
	atomic_add_64(&spa->spa_lowmem_page_load, reserve / 8);
	return (0);
	} else if (spa->spa_lowmem_page_load > 0 && arc_reclaim_needed()) {
	/* memory is low, delay before restarting */
	ARCSTAT_INCR(arcstat_memory_throttle_count, 1);
	DMU_TX_STAT_BUMP(dmu_tx_memory_reclaim);
	return (SET_ERROR(EAGAIN));
	}
	spa->spa_lowmem_page_load = 0;
	return (0);
	}

	static void
	arc_set_sys_free(uint64_t allmem)
	{
	/*
	* The ARC tries to keep at least this much memory available for the
	* system. This gives the ARC time to shrink in response to memory
	* pressure, before running completely out of memory and invoking the
	* direct-reclaim ARC shrinker.
	*
	* This should be more than twice high_wmark_pages(), so that
	* arc_wait_for_eviction() will wait until at least the
	* high_wmark_pages() are free (see arc_evict_state_impl()).
	*
	* Note: Even when the system is very low on memory, the kernel's
	* shrinker code may only ask for one "batch" of pages (512KB) to be
	* evicted. If concurrent allocations consume these pages, there may
	* still be insufficient free pages, and the OOM killer takes action.
	*
	* By setting arc_sys_free large enough, and having
	* arc_wait_for_eviction() wait until there is at least arc_sys_free/2
	* free memory, it is much less likely that concurrent allocations can
	* consume all the memory that was evicted before checking for
	* OOM.
	*
	* It's hard to iterate the zones from a linux kernel module, which
	* makes it difficult to determine the watermark dynamically. Instead
	* we compute the maximum high watermark for this system, based
	* on the amount of memory, assuming default parameters on Linux kernel
	* 5.3.
	*/

	/*
	* Base wmark_low is 4 * the square root of Kbytes of RAM.
	*/
	long wmark = 4 * int_sqrt(allmem/1024) * 1024;

	/*
	* Clamp to between 128K and 64MB.
	*/
	wmark = MAX(wmark, 128 * 1024);
	wmark = MIN(wmark, 64 * 1024 * 1024);

	/*
	* watermark_boost can increase the wmark by up to 150%.
	*/
	wmark += wmark * 150 / 100;

	/*
	* arc_sys_free needs to be more than 2x the watermark, because
	* arc_wait_for_eviction() waits for half of arc_sys_free. Bump this up
	* to 3x to ensure we're above it.
	*/
	arc_sys_free = wmark * 3 + allmem / 32;
	}

	void
	arc_lowmem_init(void)
	{
	uint64_t allmem = arc_all_memory();

	/*
	* Register a shrinker to support synchronous (direct) memory
	* reclaim from the arc. This is done to prevent kswapd from
	* swapping out pages when it is preferable to shrink the arc.
	*/
	spl_register_shrinker(&arc_shrinker);
	arc_set_sys_free(allmem);
	}

	void
	arc_lowmem_fini(void)
	{
	spl_unregister_shrinker(&arc_shrinker);
	}

	int
	param_set_arc_long(const char buf, zfs_kernel_param_t kp)
	{
	int error;

	error = param_set_long(buf, kp);
	if (error < 0)
	return (SET_ERROR(error));

	arc_tuning_update(B_TRUE);

	return (0);
	}

	+int
	+param_set_arc_min(const char buf, zfs_kernel_param_t kp)
	+{
	+ return (param_set_arc_long(buf, kp));
	+}
	+
	+int
	+param_set_arc_max(const char buf, zfs_kernel_param_t kp)
	+{
	+ return (param_set_arc_long(buf, kp));
	+}
	+
	int
	param_set_arc_int(const char buf, zfs_kernel_param_t kp)
	{
	int error;

	error = param_set_int(buf, kp);
	if (error < 0)
	return (SET_ERROR(error));

	arc_tuning_update(B_TRUE);

	return (0);
	}

	#ifdef CONFIG_MEMORY_HOTPLUG
	/* ARGSUSED */
	static int
	arc_hotplug_callback(struct notifier_block *self, unsigned long action,
	void *arg)
	{
	uint64_t allmem = arc_all_memory();
	if (action != MEM_ONLINE)
	return (NOTIFY_OK);

	arc_set_limits(allmem);

	#ifdef __LP64__
	if (zfs_dirty_data_max_max == 0)
	zfs_dirty_data_max_max = MIN(4ULL * 1024 * 1024 * 1024,
	allmem * zfs_dirty_data_max_max_percent / 100);
	#else
	if (zfs_dirty_data_max_max == 0)
	zfs_dirty_data_max_max = MIN(1ULL * 1024 * 1024 * 1024,
	allmem * zfs_dirty_data_max_max_percent / 100);
	#endif

	arc_set_sys_free(allmem);
	return (NOTIFY_OK);
	}
	#endif

	void
	arc_register_hotplug(void)
	{
	#ifdef CONFIG_MEMORY_HOTPLUG
	arc_hotplug_callback_mem_nb.notifier_call = arc_hotplug_callback;
	/* There is no significance to the value 100 */
	arc_hotplug_callback_mem_nb.priority = 100;
	register_memory_notifier(&arc_hotplug_callback_mem_nb);
	#endif
	}

	void
	arc_unregister_hotplug(void)
	{
	#ifdef CONFIG_MEMORY_HOTPLUG
	unregister_memory_notifier(&arc_hotplug_callback_mem_nb);
	#endif
	}
	#else /* _KERNEL */
	int64_t
	arc_available_memory(void)
	{
	int64_t lowest = INT64_MAX;

	/* Every 100 calls, free a small amount */
	- if (spa_get_random(100) == 0)
	+ if (random_in_range(100) == 0)
	lowest = -1024;

	return (lowest);
	}

	int
	arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg)
	{
	return (0);
	}

	uint64_t
	arc_all_memory(void)
	{
	return (ptob(physmem) / 2);
	}

	uint64_t
	arc_free_memory(void)
	{
	- return (spa_get_random(arc_all_memory() * 20 / 100));
	+ return (random_in_range(arc_all_memory() * 20 / 100));
	}

	void
	arc_register_hotplug(void)
	{
	}

	void
	arc_unregister_hotplug(void)
	{
	}
	#endif /* _KERNEL */

	/*
	* Helper function for arc_prune_async() it is responsible for safely
	* handling the execution of a registered arc_prune_func_t.
	*/
	static void
	arc_prune_task(void *ptr)
	{
	arc_prune_t ap = (arc_prune_t )ptr;
	arc_prune_func_t *func = ap->p_pfunc;

	if (func != NULL)
	func(ap->p_adjust, ap->p_private);

	zfs_refcount_remove(&ap->p_refcnt, func);
	}

	/*
	* Notify registered consumers they must drop holds on a portion of the ARC
	* buffered they reference. This provides a mechanism to ensure the ARC can
	* honor the arc_meta_limit and reclaim otherwise pinned ARC buffers. This
	* is analogous to dnlc_reduce_cache() but more generic.
	*
	* This operation is performed asynchronously so it may be safely called
	* in the context of the arc_reclaim_thread(). A reference is taken here
	* for each registered arc_prune_t and the arc_prune_task() is responsible
	* for releasing it once the registered arc_prune_func_t has completed.
	*/
	void
	arc_prune_async(int64_t adjust)
	{
	arc_prune_t *ap;

	mutex_enter(&arc_prune_mtx);
	for (ap = list_head(&arc_prune_list); ap != NULL;
	ap = list_next(&arc_prune_list, ap)) {

	if (zfs_refcount_count(&ap->p_refcnt) >= 2)
	continue;

	zfs_refcount_add(&ap->p_refcnt, ap->p_pfunc);
	ap->p_adjust = adjust;
	if (taskq_dispatch(arc_prune_taskq, arc_prune_task,
	ap, TQ_SLEEP) == TASKQID_INVALID) {
	zfs_refcount_remove(&ap->p_refcnt, ap->p_pfunc);
	continue;
	}
	ARCSTAT_BUMP(arcstat_prune);
	}
	mutex_exit(&arc_prune_mtx);
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, shrinker_limit, INT, ZMOD_RW,
	"Limit on number of pages that ARC shrinker can reclaim at once");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/qat_compress.c b/sys/contrib/openzfs/module/os/linux/zfs/qat_compress.c
	index ad3ead3b16e3..1d099c95bc7c 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/qat_compress.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/qat_compress.c
	@@ -1,569 +1,550 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	#if defined(_KERNEL) && defined(HAVE_QAT)
	#include <linux/slab.h>
	#include <linux/vmalloc.h>
	#include <linux/pagemap.h>
	#include <linux/completion.h>
	#include <sys/zfs_context.h>
	#include <sys/byteorder.h>
	#include <sys/zio.h>
	#include <sys/qat.h>

	/*
	* Max instances in a QAT device, each instance is a channel to submit
	* jobs to QAT hardware, this is only for pre-allocating instance and
	* session arrays; the actual number of instances are defined in the
	* QAT driver's configuration file.
	*/
	#define QAT_DC_MAX_INSTANCES 48

	/*
	* ZLIB head and foot size
	*/
	#define ZLIB_HEAD_SZ 2
	#define ZLIB_FOOT_SZ 4

	static CpaInstanceHandle dc_inst_handles[QAT_DC_MAX_INSTANCES];
	static CpaDcSessionHandle session_handles[QAT_DC_MAX_INSTANCES];
	static CpaBufferList **buffer_array[QAT_DC_MAX_INSTANCES];
	static Cpa16U num_inst = 0;
	static Cpa32U inst_num = 0;
	static boolean_t qat_dc_init_done = B_FALSE;
	int zfs_qat_compress_disable = 0;

	boolean_t
	qat_dc_use_accel(size_t s_len)
	{
	return (!zfs_qat_compress_disable &&
	qat_dc_init_done &&
	s_len >= QAT_MIN_BUF_SIZE &&
	s_len <= QAT_MAX_BUF_SIZE);
	}

	static void
	qat_dc_callback(void *p_callback, CpaStatus status)
	{
	if (p_callback != NULL)
	complete((struct completion *)p_callback);
	}

	static void
	qat_dc_clean(void)
	{
	Cpa16U buff_num = 0;
	Cpa16U num_inter_buff_lists = 0;

	for (Cpa16U i = 0; i < num_inst; i++) {
	cpaDcStopInstance(dc_inst_handles[i]);
	QAT_PHYS_CONTIG_FREE(session_handles[i]);
	/* free intermediate buffers */
	if (buffer_array[i] != NULL) {
	cpaDcGetNumIntermediateBuffers(
	dc_inst_handles[i], &num_inter_buff_lists);
	for (buff_num = 0; buff_num < num_inter_buff_lists;
	buff_num++) {
	CpaBufferList *buffer_inter =
	buffer_array[i][buff_num];
	if (buffer_inter->pBuffers) {
	QAT_PHYS_CONTIG_FREE(
	buffer_inter->pBuffers->pData);
	QAT_PHYS_CONTIG_FREE(
	buffer_inter->pBuffers);
	}
	QAT_PHYS_CONTIG_FREE(
	buffer_inter->pPrivateMetaData);
	QAT_PHYS_CONTIG_FREE(buffer_inter);
	}
	}
	}

	num_inst = 0;
	qat_dc_init_done = B_FALSE;
	}

	int
	qat_dc_init(void)
	{
	CpaStatus status = CPA_STATUS_SUCCESS;
	Cpa32U sess_size = 0;
	Cpa32U ctx_size = 0;
	Cpa16U num_inter_buff_lists = 0;
	Cpa16U buff_num = 0;
	Cpa32U buff_meta_size = 0;
	CpaDcSessionSetupData sd = {0};

	if (qat_dc_init_done)
	return (0);

	status = cpaDcGetNumInstances(&num_inst);
	if (status != CPA_STATUS_SUCCESS)
	return (-1);

	/* if the user has configured no QAT compression units just return */
	if (num_inst == 0)
	return (0);

	if (num_inst > QAT_DC_MAX_INSTANCES)
	num_inst = QAT_DC_MAX_INSTANCES;

	status = cpaDcGetInstances(num_inst, &dc_inst_handles[0]);
	if (status != CPA_STATUS_SUCCESS)
	return (-1);

	for (Cpa16U i = 0; i < num_inst; i++) {
	cpaDcSetAddressTranslation(dc_inst_handles[i],
	(void*)virt_to_phys);

	status = cpaDcBufferListGetMetaSize(dc_inst_handles[i],
	1, &buff_meta_size);

	if (status == CPA_STATUS_SUCCESS)
	status = cpaDcGetNumIntermediateBuffers(
	dc_inst_handles[i], &num_inter_buff_lists);

	if (status == CPA_STATUS_SUCCESS && num_inter_buff_lists != 0)
	status = QAT_PHYS_CONTIG_ALLOC(&buffer_array[i],
	num_inter_buff_lists *
	sizeof (CpaBufferList *));

	for (buff_num = 0; buff_num < num_inter_buff_lists;
	buff_num++) {
	if (status == CPA_STATUS_SUCCESS)
	status = QAT_PHYS_CONTIG_ALLOC(
	&buffer_array[i][buff_num],
	sizeof (CpaBufferList));

	if (status == CPA_STATUS_SUCCESS)
	status = QAT_PHYS_CONTIG_ALLOC(
	&buffer_array[i][buff_num]->
	pPrivateMetaData,
	buff_meta_size);

	if (status == CPA_STATUS_SUCCESS)
	status = QAT_PHYS_CONTIG_ALLOC(
	&buffer_array[i][buff_num]->pBuffers,
	sizeof (CpaFlatBuffer));

	if (status == CPA_STATUS_SUCCESS) {
	/*
	* implementation requires an intermediate
	* buffer approximately twice the size of
	* output buffer, which is 2x max buffer
	* size here.
	*/
	status = QAT_PHYS_CONTIG_ALLOC(
	&buffer_array[i][buff_num]->pBuffers->
	pData, 2 * QAT_MAX_BUF_SIZE);
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	buffer_array[i][buff_num]->numBuffers = 1;
	buffer_array[i][buff_num]->pBuffers->
	dataLenInBytes = 2 * QAT_MAX_BUF_SIZE;
	}
	}

	status = cpaDcStartInstance(dc_inst_handles[i],
	num_inter_buff_lists, buffer_array[i]);
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	sd.compLevel = CPA_DC_L1;
	sd.compType = CPA_DC_DEFLATE;
	sd.huffType = CPA_DC_HT_FULL_DYNAMIC;
	sd.sessDirection = CPA_DC_DIR_COMBINED;
	sd.sessState = CPA_DC_STATELESS;
	sd.deflateWindowSize = 7;
	sd.checksum = CPA_DC_ADLER32;
	status = cpaDcGetSessionSize(dc_inst_handles[i],
	&sd, &sess_size, &ctx_size);
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	QAT_PHYS_CONTIG_ALLOC(&session_handles[i], sess_size);
	if (session_handles[i] == NULL)
	goto fail;

	status = cpaDcInitSession(dc_inst_handles[i],
	session_handles[i],
	&sd, NULL, qat_dc_callback);
	if (status != CPA_STATUS_SUCCESS)
	goto fail;
	}

	qat_dc_init_done = B_TRUE;
	return (0);
	fail:
	qat_dc_clean();
	return (-1);
	}

	void
	qat_dc_fini(void)
	{
	if (!qat_dc_init_done)
	return;

	qat_dc_clean();
	}

	/*
	* The "add" parameter is an additional buffer which is passed
	* to QAT as a scratch buffer alongside the destination buffer
	* in case the "compressed" data ends up being larger than the
	* original source data. This is necessary to prevent QAT from
	* generating buffer overflow warnings for incompressible data.
	*/
	static int
	qat_compress_impl(qat_compress_dir_t dir, char *src, int src_len,
	char dst, int dst_len, char add, int add_len, size_t *c_len)
	{
	CpaInstanceHandle dc_inst_handle;
	CpaDcSessionHandle session_handle;
	CpaBufferList *buf_list_src = NULL;
	CpaBufferList *buf_list_dst = NULL;
	CpaFlatBuffer *flat_buf_src = NULL;
	CpaFlatBuffer *flat_buf_dst = NULL;
	Cpa8U *buffer_meta_src = NULL;
	Cpa8U *buffer_meta_dst = NULL;
	Cpa32U buffer_meta_size = 0;
	CpaDcRqResults dc_results;
	CpaStatus status = CPA_STATUS_FAIL;
	Cpa32U hdr_sz = 0;
	Cpa32U compressed_sz;
	Cpa32U num_src_buf = (src_len >> PAGE_SHIFT) + 2;
	Cpa32U num_dst_buf = (dst_len >> PAGE_SHIFT) + 2;
	Cpa32U num_add_buf = (add_len >> PAGE_SHIFT) + 2;
	Cpa32U bytes_left;
	Cpa32U dst_pages = 0;
	Cpa32U adler32 = 0;
	char *data;
	struct page *page;
	struct page **in_pages = NULL;
	struct page **out_pages = NULL;
	struct page **add_pages = NULL;
	Cpa32U page_off = 0;
	struct completion complete;
	Cpa32U page_num = 0;
	Cpa16U i;

	/*
	* We increment num_src_buf and num_dst_buf by 2 to allow
	* us to handle non page-aligned buffer addresses and buffers
	* whose sizes are not divisible by PAGE_SIZE.
	*/
	Cpa32U src_buffer_list_mem_size = sizeof (CpaBufferList) +
	(num_src_buf * sizeof (CpaFlatBuffer));
	Cpa32U dst_buffer_list_mem_size = sizeof (CpaBufferList) +
	((num_dst_buf + num_add_buf) * sizeof (CpaFlatBuffer));

	status = QAT_PHYS_CONTIG_ALLOC(&in_pages,
	num_src_buf * sizeof (struct page *));
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	status = QAT_PHYS_CONTIG_ALLOC(&out_pages,
	num_dst_buf * sizeof (struct page *));
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	status = QAT_PHYS_CONTIG_ALLOC(&add_pages,
	num_add_buf * sizeof (struct page *));
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	i = (Cpa32U)atomic_inc_32_nv(&inst_num) % num_inst;
	dc_inst_handle = dc_inst_handles[i];
	session_handle = session_handles[i];

	cpaDcBufferListGetMetaSize(dc_inst_handle, num_src_buf,
	&buffer_meta_size);
	status = QAT_PHYS_CONTIG_ALLOC(&buffer_meta_src, buffer_meta_size);
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	cpaDcBufferListGetMetaSize(dc_inst_handle, num_dst_buf + num_add_buf,
	&buffer_meta_size);
	status = QAT_PHYS_CONTIG_ALLOC(&buffer_meta_dst, buffer_meta_size);
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	/* build source buffer list */
	status = QAT_PHYS_CONTIG_ALLOC(&buf_list_src, src_buffer_list_mem_size);
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	flat_buf_src = (CpaFlatBuffer *)(buf_list_src + 1);

	buf_list_src->pBuffers = flat_buf_src; /* always point to first one */

	/* build destination buffer list */
	status = QAT_PHYS_CONTIG_ALLOC(&buf_list_dst, dst_buffer_list_mem_size);
	if (status != CPA_STATUS_SUCCESS)
	goto fail;

	flat_buf_dst = (CpaFlatBuffer *)(buf_list_dst + 1);

	buf_list_dst->pBuffers = flat_buf_dst; /* always point to first one */

	buf_list_src->numBuffers = 0;
	buf_list_src->pPrivateMetaData = buffer_meta_src;
	bytes_left = src_len;
	data = src;
	page_num = 0;
	while (bytes_left > 0) {
	page_off = ((long)data & ~PAGE_MASK);
	page = qat_mem_to_page(data);
	in_pages[page_num] = page;
	flat_buf_src->pData = kmap(page) + page_off;
	flat_buf_src->dataLenInBytes =
	min((long)PAGE_SIZE - page_off, (long)bytes_left);

	bytes_left -= flat_buf_src->dataLenInBytes;
	data += flat_buf_src->dataLenInBytes;
	flat_buf_src++;
	buf_list_src->numBuffers++;
	page_num++;
	}

	buf_list_dst->numBuffers = 0;
	buf_list_dst->pPrivateMetaData = buffer_meta_dst;
	bytes_left = dst_len;
	data = dst;
	page_num = 0;
	while (bytes_left > 0) {
	page_off = ((long)data & ~PAGE_MASK);
	page = qat_mem_to_page(data);
	flat_buf_dst->pData = kmap(page) + page_off;
	out_pages[page_num] = page;
	flat_buf_dst->dataLenInBytes =
	min((long)PAGE_SIZE - page_off, (long)bytes_left);

	bytes_left -= flat_buf_dst->dataLenInBytes;
	data += flat_buf_dst->dataLenInBytes;
	flat_buf_dst++;
	buf_list_dst->numBuffers++;
	page_num++;
	dst_pages++;
	}

	/* map additional scratch pages into the destination buffer list */
	bytes_left = add_len;
	data = add;
	page_num = 0;
	while (bytes_left > 0) {
	page_off = ((long)data & ~PAGE_MASK);
	page = qat_mem_to_page(data);
	flat_buf_dst->pData = kmap(page) + page_off;
	add_pages[page_num] = page;
	flat_buf_dst->dataLenInBytes =
	min((long)PAGE_SIZE - page_off, (long)bytes_left);

	bytes_left -= flat_buf_dst->dataLenInBytes;
	data += flat_buf_dst->dataLenInBytes;
	flat_buf_dst++;
	buf_list_dst->numBuffers++;
	page_num++;
	}

	init_completion(&complete);

	if (dir == QAT_COMPRESS) {
	QAT_STAT_BUMP(comp_requests);
	QAT_STAT_INCR(comp_total_in_bytes, src_len);

	cpaDcGenerateHeader(session_handle,
	buf_list_dst->pBuffers, &hdr_sz);
	buf_list_dst->pBuffers->pData += hdr_sz;
	buf_list_dst->pBuffers->dataLenInBytes -= hdr_sz;
	status = cpaDcCompressData(
	dc_inst_handle, session_handle,
	buf_list_src, buf_list_dst,
	&dc_results, CPA_DC_FLUSH_FINAL,
	&complete);
	if (status != CPA_STATUS_SUCCESS) {
	goto fail;
	}

	/* we now wait until the completion of the operation. */
	wait_for_completion(&complete);

	if (dc_results.status != CPA_STATUS_SUCCESS) {
	status = CPA_STATUS_FAIL;
	goto fail;
	}

	compressed_sz = dc_results.produced;
	if (compressed_sz + hdr_sz + ZLIB_FOOT_SZ > dst_len) {
	status = CPA_STATUS_INCOMPRESSIBLE;
	goto fail;
	}

	- flat_buf_dst = (CpaFlatBuffer *)(buf_list_dst + 1);
	- /* move to the last page */
	- flat_buf_dst += (compressed_sz + hdr_sz) >> PAGE_SHIFT;
	+ /* get adler32 checksum and append footer */
	+ (Cpa32U)(dst + hdr_sz + compressed_sz) =
	+ BSWAP_32(dc_results.checksum);

	- /* no space for gzip footer in the last page */
	- if (((compressed_sz + hdr_sz) % PAGE_SIZE)
	- + ZLIB_FOOT_SZ > PAGE_SIZE) {
	- status = CPA_STATUS_INCOMPRESSIBLE;
	- goto fail;
	- }
	-
	- /* jump to the end of the buffer and append footer */
	- flat_buf_dst->pData =
	- (char *)((unsigned long)flat_buf_dst->pData & PAGE_MASK)
	- + ((compressed_sz + hdr_sz) % PAGE_SIZE);
	- flat_buf_dst->dataLenInBytes = ZLIB_FOOT_SZ;
	-
	- dc_results.produced = 0;
	- status = cpaDcGenerateFooter(session_handle,
	- flat_buf_dst, &dc_results);
	- if (status != CPA_STATUS_SUCCESS)
	- goto fail;
	-
	- *c_len = compressed_sz + dc_results.produced + hdr_sz;
	+ *c_len = hdr_sz + compressed_sz + ZLIB_FOOT_SZ;
	QAT_STAT_INCR(comp_total_out_bytes, *c_len);
	} else {
	ASSERT3U(dir, ==, QAT_DECOMPRESS);
	QAT_STAT_BUMP(decomp_requests);
	QAT_STAT_INCR(decomp_total_in_bytes, src_len);

	buf_list_src->pBuffers->pData += ZLIB_HEAD_SZ;
	buf_list_src->pBuffers->dataLenInBytes -= ZLIB_HEAD_SZ;
	status = cpaDcDecompressData(dc_inst_handle, session_handle,
	buf_list_src, buf_list_dst, &dc_results, CPA_DC_FLUSH_FINAL,
	&complete);

	if (CPA_STATUS_SUCCESS != status) {
	status = CPA_STATUS_FAIL;
	goto fail;
	}

	/* we now wait until the completion of the operation. */
	wait_for_completion(&complete);

	if (dc_results.status != CPA_STATUS_SUCCESS) {
	status = CPA_STATUS_FAIL;
	goto fail;
	}

	/* verify adler checksum */
	adler32 = (Cpa32U )(src + dc_results.consumed + ZLIB_HEAD_SZ);
	if (adler32 != BSWAP_32(dc_results.checksum)) {
	status = CPA_STATUS_FAIL;
	goto fail;
	}
	*c_len = dc_results.produced;
	QAT_STAT_INCR(decomp_total_out_bytes, *c_len);
	}

	fail:
	if (status != CPA_STATUS_SUCCESS && status != CPA_STATUS_INCOMPRESSIBLE)
	QAT_STAT_BUMP(dc_fails);

	if (in_pages) {
	for (page_num = 0;
	page_num < buf_list_src->numBuffers;
	page_num++) {
	kunmap(in_pages[page_num]);
	}
	QAT_PHYS_CONTIG_FREE(in_pages);
	}

	if (out_pages) {
	for (page_num = 0; page_num < dst_pages; page_num++) {
	kunmap(out_pages[page_num]);
	}
	QAT_PHYS_CONTIG_FREE(out_pages);
	}

	if (add_pages) {
	for (page_num = 0;
	page_num < buf_list_dst->numBuffers - dst_pages;
	page_num++) {
	kunmap(add_pages[page_num]);
	}
	QAT_PHYS_CONTIG_FREE(add_pages);
	}

	QAT_PHYS_CONTIG_FREE(buffer_meta_src);
	QAT_PHYS_CONTIG_FREE(buffer_meta_dst);
	QAT_PHYS_CONTIG_FREE(buf_list_src);
	QAT_PHYS_CONTIG_FREE(buf_list_dst);

	return (status);
	}

	/*
	* Entry point for QAT accelerated compression / decompression.
	*/
	int
	qat_compress(qat_compress_dir_t dir, char *src, int src_len,
	char dst, int dst_len, size_t c_len)
	{
	int ret;
	size_t add_len = 0;
	void *add = NULL;

	if (dir == QAT_COMPRESS) {
	add_len = dst_len;
	add = zio_data_buf_alloc(add_len);
	}

	ret = qat_compress_impl(dir, src, src_len, dst,
	dst_len, add, add_len, c_len);

	if (dir == QAT_COMPRESS)
	zio_data_buf_free(add, add_len);

	return (ret);
	}

	static int
	param_set_qat_compress(const char val, zfs_kernel_param_t kp)
	{
	int ret;
	int *pvalue = kp->arg;
	ret = param_set_int(val, kp);
	if (ret)
	return (ret);
	/*
	* zfs_qat_compress_disable = 0: enable qat compress
	* try to initialize qat instance if it has not been done
	*/
	if (*pvalue == 0 && !qat_dc_init_done) {
	ret = qat_dc_init();
	if (ret != 0) {
	zfs_qat_compress_disable = 1;
	return (ret);
	}
	}
	return (ret);
	}

	module_param_call(zfs_qat_compress_disable, param_set_qat_compress,
	param_get_int, &zfs_qat_compress_disable, 0644);
	MODULE_PARM_DESC(zfs_qat_compress_disable, "Enable/Disable QAT compression");

	#endif
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/zfs_file_os.c b/sys/contrib/openzfs/module/os/linux/zfs/zfs_file_os.c
	index 35e647375d9d..e12f7c3ced43 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/zfs_file_os.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/zfs_file_os.c
	@@ -1,442 +1,428 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	#include <sys/zfs_context.h>
	#include <sys/zfs_file.h>
	#include <sys/stat.h>
	#include <sys/file.h>
	#include <linux/falloc.h>
	#include <linux/fs.h>
	#include <linux/uaccess.h>
	#ifdef HAVE_FDTABLE_HEADER
	#include <linux/fdtable.h>
	#endif

	/*
	* Open file
	*
	* path - fully qualified path to file
	* flags - file attributes O_READ / O_WRITE / O_EXCL
	* fpp - pointer to return file pointer
	*
	* Returns 0 on success underlying error on failure.
	*/
	int
	zfs_file_open(const char path, int flags, int mode, zfs_file_t *fpp)
	{
	struct file *filp;
	int saved_umask;

	if (!(flags & O_CREAT) && (flags & O_WRONLY))
	flags \|= O_EXCL;

	if (flags & O_CREAT)
	saved_umask = xchg(&current->fs->umask, 0);

	filp = filp_open(path, flags, mode);

	if (flags & O_CREAT)
	(void) xchg(&current->fs->umask, saved_umask);

	if (IS_ERR(filp))
	return (-PTR_ERR(filp));

	*fpp = filp;
	return (0);
	}

	void
	zfs_file_close(zfs_file_t *fp)
	{
	filp_close(fp, 0);
	}

	static ssize_t
	zfs_file_write_impl(zfs_file_t fp, const void buf, size_t count, loff_t *off)
	{
	#if defined(HAVE_KERNEL_WRITE_PPOS)
	return (kernel_write(fp, buf, count, off));
	#else
	mm_segment_t saved_fs;
	ssize_t rc;

	saved_fs = get_fs();
	set_fs(KERNEL_DS);

	rc = vfs_write(fp, (__force const char __user __user *)buf, count, off);

	set_fs(saved_fs);

	return (rc);
	#endif
	}

	/*
	* Stateful write - use os internal file pointer to determine where to
	* write and update on successful completion.
	*
	* fp - pointer to file (pipe, socket, etc) to write to
	* buf - buffer to write
	* count - # of bytes to write
	* resid - pointer to count of unwritten bytes (if short write)
	*
	* Returns 0 on success errno on failure.
	*/
	int
	zfs_file_write(zfs_file_t fp, const void buf, size_t count, ssize_t *resid)
	{
	loff_t off = fp->f_pos;
	ssize_t rc;

	rc = zfs_file_write_impl(fp, buf, count, &off);
	if (rc < 0)
	return (-rc);

	fp->f_pos = off;

	if (resid) {
	*resid = count - rc;
	} else if (rc != count) {
	return (EIO);
	}

	return (0);
	}

	/*
	* Stateless write - os internal file pointer is not updated.
	*
	* fp - pointer to file (pipe, socket, etc) to write to
	* buf - buffer to write
	* count - # of bytes to write
	* off - file offset to write to (only valid for seekable types)
	* resid - pointer to count of unwritten bytes
	*
	* Returns 0 on success errno on failure.
	*/
	int
	zfs_file_pwrite(zfs_file_t fp, const void buf, size_t count, loff_t off,
	ssize_t *resid)
	{
	ssize_t rc;

	rc = zfs_file_write_impl(fp, buf, count, &off);
	if (rc < 0)
	return (-rc);

	if (resid) {
	*resid = count - rc;
	} else if (rc != count) {
	return (EIO);
	}

	return (0);
	}

	static ssize_t
	zfs_file_read_impl(zfs_file_t fp, void buf, size_t count, loff_t *off)
	{
	#if defined(HAVE_KERNEL_READ_PPOS)
	return (kernel_read(fp, buf, count, off));
	#else
	mm_segment_t saved_fs;
	ssize_t rc;

	saved_fs = get_fs();
	set_fs(KERNEL_DS);

	rc = vfs_read(fp, (void __user *)buf, count, off);
	set_fs(saved_fs);

	return (rc);
	#endif
	}

	/*
	* Stateful read - use os internal file pointer to determine where to
	* read and update on successful completion.
	*
	* fp - pointer to file (pipe, socket, etc) to read from
	* buf - buffer to write
	* count - # of bytes to read
	* resid - pointer to count of unread bytes (if short read)
	*
	* Returns 0 on success errno on failure.
	*/
	int
	zfs_file_read(zfs_file_t fp, void buf, size_t count, ssize_t *resid)
	{
	loff_t off = fp->f_pos;
	ssize_t rc;

	rc = zfs_file_read_impl(fp, buf, count, &off);
	if (rc < 0)
	return (-rc);

	fp->f_pos = off;

	if (resid) {
	*resid = count - rc;
	} else if (rc != count) {
	return (EIO);
	}

	return (0);
	}

	/*
	* Stateless read - os internal file pointer is not updated.
	*
	* fp - pointer to file (pipe, socket, etc) to read from
	* buf - buffer to write
	* count - # of bytes to write
	* off - file offset to read from (only valid for seekable types)
	* resid - pointer to count of unwritten bytes (if short write)
	*
	* Returns 0 on success errno on failure.
	*/
	int
	zfs_file_pread(zfs_file_t fp, void buf, size_t count, loff_t off,
	ssize_t *resid)
	{
	ssize_t rc;

	rc = zfs_file_read_impl(fp, buf, count, &off);
	if (rc < 0)
	return (-rc);

	if (resid) {
	*resid = count - rc;
	} else if (rc != count) {
	return (EIO);
	}

	return (0);
	}

	/*
	* lseek - set / get file pointer
	*
	* fp - pointer to file (pipe, socket, etc) to read from
	* offp - value to seek to, returns current value plus passed offset
	* whence - see man pages for standard lseek whence values
	*
	* Returns 0 on success errno on failure (ESPIPE for non seekable types)
	*/
	int
	zfs_file_seek(zfs_file_t fp, loff_t offp, int whence)
	{
	loff_t rc;

	if (offp < 0 \|\| offp > MAXOFFSET_T)
	return (EINVAL);

	rc = vfs_llseek(fp, *offp, whence);
	if (rc < 0)
	return (-rc);

	*offp = rc;

	return (0);
	}

	/*
	* Get file attributes
	*
	* filp - file pointer
	* zfattr - pointer to file attr structure
	*
	* Currently only used for fetching size and file mode.
	*
	* Returns 0 on success or error code of underlying getattr call on failure.
	*/
	int
	zfs_file_getattr(zfs_file_t filp, zfs_file_attr_t zfattr)
	{
	struct kstat stat;
	int rc;

	#if defined(HAVE_4ARGS_VFS_GETATTR)
	rc = vfs_getattr(&filp->f_path, &stat, STATX_BASIC_STATS,
	AT_STATX_SYNC_AS_STAT);
	#elif defined(HAVE_2ARGS_VFS_GETATTR)
	rc = vfs_getattr(&filp->f_path, &stat);
	#elif defined(HAVE_3ARGS_VFS_GETATTR)
	rc = vfs_getattr(filp->f_path.mnt, filp->f_dentry, &stat);
	#else
	#error "No available vfs_getattr()"
	#endif
	if (rc)
	return (-rc);

	zfattr->zfa_size = stat.size;
	zfattr->zfa_mode = stat.mode;

	return (0);
	}

	/*
	* Sync file to disk
	*
	* filp - file pointer
	* flags - O_SYNC and or O_DSYNC
	*
	* Returns 0 on success or error code of underlying sync call on failure.
	*/
	int
	zfs_file_fsync(zfs_file_t *filp, int flags)
	{
	int datasync = 0;
	int error;
	int fstrans;

	if (flags & O_DSYNC)
	datasync = 1;

	/*
	* May enter XFS which generates a warning when PF_FSTRANS is set.
	* To avoid this the flag is cleared over vfs_sync() and then reset.
	*/
	fstrans = __spl_pf_fstrans_check();
	if (fstrans)
	current->flags &= ~(__SPL_PF_FSTRANS);

	error = -vfs_fsync(filp, datasync);

	if (fstrans)
	current->flags \|= __SPL_PF_FSTRANS;

	return (error);
	}

	/*
	* fallocate - allocate or free space on disk
	*
	* fp - file pointer
	* mode (non-standard options for hole punching etc)
	* offset - offset to start allocating or freeing from
	* len - length to free / allocate
	*
	* OPTIONAL
	*/
	int
	zfs_file_fallocate(zfs_file_t *fp, int mode, loff_t offset, loff_t len)
	{
	/*
	* May enter XFS which generates a warning when PF_FSTRANS is set.
	* To avoid this the flag is cleared over vfs_sync() and then reset.
	*/
	int fstrans = __spl_pf_fstrans_check();
	if (fstrans)
	current->flags &= ~(__SPL_PF_FSTRANS);

	/*
	* When supported by the underlying file system preferentially
	* use the fallocate() callback to preallocate the space.
	*/
	int error = EOPNOTSUPP;
	if (fp->f_op->fallocate)
	error = fp->f_op->fallocate(fp, mode, offset, len);

	if (fstrans)
	current->flags \|= __SPL_PF_FSTRANS;

	return (error);
	}

	/*
	* Request current file pointer offset
	*
	* fp - pointer to file
	*
	* Returns current file offset.
	*/
	loff_t
	zfs_file_off(zfs_file_t *fp)
	{
	return (fp->f_pos);
	}

	/*
	* Request file pointer private data
	*
	* fp - pointer to file
	*
	* Returns pointer to file private data.
	*/
	void *
	zfs_file_private(zfs_file_t *fp)
	{
	return (fp->private_data);
	}

	/*
	* unlink file
	*
	* path - fully qualified file path
	*
	* Returns 0 on success.
	*
	* OPTIONAL
	*/
	int
	zfs_file_unlink(const char *path)
	{
	return (EOPNOTSUPP);
	}

	/*
	* Get reference to file pointer
	*
	* fd - input file descriptor
	- * fpp - pointer to file pointer
	*
	- * Returns 0 on success EBADF on failure.
	+ * Returns pointer to file struct or NULL
	*/
	-int
	-zfs_file_get(int fd, zfs_file_t **fpp)
	+zfs_file_t *
	+zfs_file_get(int fd)
	{
	- zfs_file_t *fp;
	-
	- fp = fget(fd);
	- if (fp == NULL)
	- return (EBADF);
	-
	- *fpp = fp;
	-
	- return (0);
	+ return (fget(fd));
	}

	/*
	* Drop reference to file pointer
	*
	- * fd - input file descriptor
	+ * fp - input file struct pointer
	*/
	void
	-zfs_file_put(int fd)
	+zfs_file_put(zfs_file_t *fp)
	{
	- struct file *fp;
	-
	- if ((fp = fget(fd)) != NULL) {
	- fput(fp);
	- fput(fp);
	- }
	+ fput(fp);
	}
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/zfs_vnops_os.c b/sys/contrib/openzfs/module/os/linux/zfs/zfs_vnops_os.c
	index 6f3faab04f3b..ef99c4864d3c 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/zfs_vnops_os.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/zfs_vnops_os.c
	@@ -1,4018 +1,4024 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
	* Copyright 2017 Nexenta Systems, Inc.
	*/

	/* Portions Copyright 2007 Jeremy Teo */
	/* Portions Copyright 2010 Robert Milkowski */


	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/sysmacros.h>
	#include <sys/vfs.h>
	#include <sys/file.h>
	#include <sys/stat.h>
	#include <sys/kmem.h>
	#include <sys/taskq.h>
	#include <sys/uio.h>
	#include <sys/vmsystm.h>
	#include <sys/atomic.h>
	#include <sys/pathname.h>
	#include <sys/cmn_err.h>
	#include <sys/errno.h>
	#include <sys/zfs_dir.h>
	#include <sys/zfs_acl.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/fs/zfs.h>
	#include <sys/dmu.h>
	#include <sys/dmu_objset.h>
	#include <sys/spa.h>
	#include <sys/txg.h>
	#include <sys/dbuf.h>
	#include <sys/zap.h>
	#include <sys/sa.h>
	#include <sys/policy.h>
	#include <sys/sunddi.h>
	#include <sys/sid.h>
	#include <sys/zfs_ctldir.h>
	#include <sys/zfs_fuid.h>
	#include <sys/zfs_quota.h>
	#include <sys/zfs_sa.h>
	#include <sys/zfs_vnops.h>
	#include <sys/zfs_rlock.h>
	#include <sys/cred.h>
	#include <sys/zpl.h>
	#include <sys/zil.h>
	#include <sys/sa_impl.h>

	/*
	* Programming rules.
	*
	* Each vnode op performs some logical unit of work. To do this, the ZPL must
	* properly lock its in-core state, create a DMU transaction, do the work,
	* record this work in the intent log (ZIL), commit the DMU transaction,
	* and wait for the intent log to commit if it is a synchronous operation.
	* Moreover, the vnode ops must work in both normal and log replay context.
	* The ordering of events is important to avoid deadlocks and references
	* to freed memory. The example below illustrates the following Big Rules:
	*
	* (1) A check must be made in each zfs thread for a mounted file system.
	* This is done avoiding races using ZFS_ENTER(zfsvfs).
	* A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes
	* must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
	* can return EIO from the calling function.
	*
	* (2) zrele() should always be the last thing except for zil_commit() (if
	* necessary) and ZFS_EXIT(). This is for 3 reasons: First, if it's the
	* last reference, the vnode/znode can be freed, so the zp may point to
	* freed memory. Second, the last reference will call zfs_zinactive(),
	* which may induce a lot of work -- pushing cached pages (which acquires
	* range locks) and syncing out cached atime changes. Third,
	* zfs_zinactive() may require a new tx, which could deadlock the system
	* if you were already holding one. This deadlock occurs because the tx
	* currently being operated on prevents a txg from syncing, which
	* prevents the new tx from progressing, resulting in a deadlock. If you
	* must call zrele() within a tx, use zfs_zrele_async(). Note that iput()
	* is a synonym for zrele().
	*
	* (3) All range locks must be grabbed before calling dmu_tx_assign(),
	* as they can span dmu_tx_assign() calls.
	*
	* (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to
	* dmu_tx_assign(). This is critical because we don't want to block
	* while holding locks.
	*
	* If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This
	* reduces lock contention and CPU usage when we must wait (note that if
	* throughput is constrained by the storage, nearly every transaction
	* must wait).
	*
	* Note, in particular, that if a lock is sometimes acquired before
	* the tx assigns, and sometimes after (e.g. z_lock), then failing
	* to use a non-blocking assign can deadlock the system. The scenario:
	*
	* Thread A has grabbed a lock before calling dmu_tx_assign().
	* Thread B is in an already-assigned tx, and blocks for this lock.
	* Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
	* forever, because the previous txg can't quiesce until B's tx commits.
	*
	* If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT,
	* then drop all locks, call dmu_tx_wait(), and try again. On subsequent
	* calls to dmu_tx_assign(), pass TXG_NOTHROTTLE in addition to TXG_NOWAIT,
	* to indicate that this operation has already called dmu_tx_wait().
	* This will ensure that we don't retry forever, waiting a short bit
	* each time.
	*
	* (5) If the operation succeeded, generate the intent log entry for it
	* before dropping locks. This ensures that the ordering of events
	* in the intent log matches the order in which they actually occurred.
	* During ZIL replay the zfs_log_* functions will update the sequence
	* number to indicate the zil transaction has replayed.
	*
	* (6) At the end of each vnode op, the DMU tx must always commit,
	* regardless of whether there were any errors.
	*
	* (7) After dropping all locks, invoke zil_commit(zilog, foid)
	* to ensure that synchronous semantics are provided when necessary.
	*
	* In general, this is how things should be ordered in each vnode op:
	*
	* ZFS_ENTER(zfsvfs); // exit if unmounted
	* top:
	* zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
	* rw_enter(...); // grab any other locks you need
	* tx = dmu_tx_create(...); // get DMU tx
	* dmu_tx_hold_*(); // hold each object you might modify
	* error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	* if (error) {
	* rw_exit(...); // drop locks
	* zfs_dirent_unlock(dl); // unlock directory entry
	* zrele(...); // release held znodes
	* if (error == ERESTART) {
	* waited = B_TRUE;
	* dmu_tx_wait(tx);
	* dmu_tx_abort(tx);
	* goto top;
	* }
	* dmu_tx_abort(tx); // abort DMU tx
	* ZFS_EXIT(zfsvfs); // finished in zfs
	* return (error); // really out of space
	* }
	* error = do_real_work(); // do whatever this VOP does
	* if (error == 0)
	* zfs_log_*(...); // on success, make ZIL entry
	* dmu_tx_commit(tx); // commit DMU tx -- error or not
	* rw_exit(...); // drop locks
	* zfs_dirent_unlock(dl); // unlock directory entry
	* zrele(...); // release held znodes
	* zil_commit(zilog, foid); // synchronous when necessary
	* ZFS_EXIT(zfsvfs); // finished in zfs
	* return (error); // done, report error
	*/

	/*
	* Virus scanning is unsupported. It would be possible to add a hook
	* here to performance the required virus scan. This could be done
	* entirely in the kernel or potentially as an update to invoke a
	* scanning utility.
	*/
	static int
	zfs_vscan(struct inode ip, cred_t cr, int async)
	{
	return (0);
	}

	/* ARGSUSED */
	int
	zfs_open(struct inode ip, int mode, int flag, cred_t cr)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	/* Honor ZFS_APPENDONLY file attribute */
	if ((mode & FMODE_WRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
	((flag & O_APPEND) == 0)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	/* Virus scan eligible files on open */
	if (!zfs_has_ctldir(zp) && zfsvfs->z_vscan && S_ISREG(ip->i_mode) &&
	!(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) {
	if (zfs_vscan(ip, cr, 0) != 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EACCES));
	}
	}

	/* Keep a count of the synchronous opens in the znode */
	if (flag & O_SYNC)
	atomic_inc_32(&zp->z_sync_cnt);

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/* ARGSUSED */
	int
	zfs_close(struct inode ip, int flag, cred_t cr)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	/* Decrement the synchronous opens in the znode */
	if (flag & O_SYNC)
	atomic_dec_32(&zp->z_sync_cnt);

	if (!zfs_has_ctldir(zp) && zfsvfs->z_vscan && S_ISREG(ip->i_mode) &&
	!(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0)
	VERIFY(zfs_vscan(ip, cr, 1) == 0);

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	#if defined(_KERNEL)
	/*
	* When a file is memory mapped, we must keep the IO data synchronized
	* between the DMU cache and the memory mapped pages. What this means:
	*
	* On Write: If we find a memory mapped page, we write to both
	* the page and the dmu buffer.
	*/
	void
	update_pages(znode_t zp, int64_t start, int len, objset_t os)
	{
	struct inode *ip = ZTOI(zp);
	struct address_space *mp = ip->i_mapping;
	struct page *pp;
	uint64_t nbytes;
	int64_t off;
	void *pb;

	off = start & (PAGE_SIZE-1);
	for (start &= PAGE_MASK; len > 0; start += PAGE_SIZE) {
	nbytes = MIN(PAGE_SIZE - off, len);

	pp = find_lock_page(mp, start >> PAGE_SHIFT);
	if (pp) {
	if (mapping_writably_mapped(mp))
	flush_dcache_page(pp);

	pb = kmap(pp);
	(void) dmu_read(os, zp->z_id, start + off, nbytes,
	pb + off, DMU_READ_PREFETCH);
	kunmap(pp);

	if (mapping_writably_mapped(mp))
	flush_dcache_page(pp);

	mark_page_accessed(pp);
	SetPageUptodate(pp);
	ClearPageError(pp);
	unlock_page(pp);
	put_page(pp);
	}

	len -= nbytes;
	off = 0;
	}
	}

	/*
	* When a file is memory mapped, we must keep the IO data synchronized
	* between the DMU cache and the memory mapped pages. What this means:
	*
	* On Read: We "read" preferentially from memory mapped pages,
	* else we default from the dmu buffer.
	*
	* NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
	* the file is memory mapped.
	*/
	int
	mappedread(znode_t zp, int nbytes, zfs_uio_t uio)
	{
	struct inode *ip = ZTOI(zp);
	struct address_space *mp = ip->i_mapping;
	struct page *pp;
	int64_t start, off;
	uint64_t bytes;
	int len = nbytes;
	int error = 0;
	void *pb;

	start = uio->uio_loffset;
	off = start & (PAGE_SIZE-1);
	for (start &= PAGE_MASK; len > 0; start += PAGE_SIZE) {
	bytes = MIN(PAGE_SIZE - off, len);

	pp = find_lock_page(mp, start >> PAGE_SHIFT);
	if (pp) {
	ASSERT(PageUptodate(pp));
	unlock_page(pp);

	pb = kmap(pp);
	error = zfs_uiomove(pb + off, bytes, UIO_READ, uio);
	kunmap(pp);

	if (mapping_writably_mapped(mp))
	flush_dcache_page(pp);

	mark_page_accessed(pp);
	put_page(pp);
	} else {
	error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
	uio, bytes);
	}

	len -= bytes;
	off = 0;
	if (error)
	break;
	}
	return (error);
	}
	#endif /* _KERNEL */

	unsigned long zfs_delete_blocks = DMU_MAX_DELETEBLKCNT;

	/*
	* Write the bytes to a file.
	*
	* IN: zp - znode of file to be written to
	* data - bytes to write
	* len - number of bytes to write
	* pos - offset to start writing at
	*
	* OUT: resid - remaining bytes to write
	*
	* RETURN: 0 if success
	* positive error code if failure. EIO is returned
	* for a short write when residp isn't provided.
	*
	* Timestamps:
	* zp - ctime\|mtime updated if byte count > 0
	*/
	int
	zfs_write_simple(znode_t zp, const void data, size_t len,
	loff_t pos, size_t *residp)
	{
	fstrans_cookie_t cookie;
	int error;

	struct iovec iov;
	iov.iov_base = (void *)data;
	iov.iov_len = len;

	zfs_uio_t uio;
	zfs_uio_iovec_init(&uio, &iov, 1, pos, UIO_SYSSPACE, len, 0);

	cookie = spl_fstrans_mark();
	error = zfs_write(zp, &uio, 0, kcred);
	spl_fstrans_unmark(cookie);

	if (error == 0) {
	if (residp != NULL)
	*residp = zfs_uio_resid(&uio);
	else if (zfs_uio_resid(&uio) != 0)
	error = SET_ERROR(EIO);
	}

	return (error);
	}

	+static void
	+zfs_rele_async_task(void *arg)
	+{
	+ iput(arg);
	+}
	+
	void
	zfs_zrele_async(znode_t *zp)
	{
	struct inode *ip = ZTOI(zp);
	objset_t *os = ITOZSB(ip)->z_os;

	ASSERT(atomic_read(&ip->i_count) > 0);
	ASSERT(os != NULL);

	/*
	* If decrementing the count would put us at 0, we can't do it inline
	* here, because that would be synchronous. Instead, dispatch an iput
	* to run later.
	*
	* For more information on the dangers of a synchronous iput, see the
	* header comment of this file.
	*/
	if (!atomic_add_unless(&ip->i_count, -1, 1)) {
	VERIFY(taskq_dispatch(dsl_pool_zrele_taskq(dmu_objset_pool(os)),
	- (task_func_t *)iput, ip, TQ_SLEEP) != TASKQID_INVALID);
	+ zfs_rele_async_task, ip, TQ_SLEEP) != TASKQID_INVALID);
	}
	}


	/*
	* Lookup an entry in a directory, or an extended attribute directory.
	* If it exists, return a held inode reference for it.
	*
	* IN: zdp - znode of directory to search.
	* nm - name of entry to lookup.
	* flags - LOOKUP_XATTR set if looking for an attribute.
	* cr - credentials of caller.
	* direntflags - directory lookup flags
	* realpnp - returned pathname.
	*
	* OUT: zpp - znode of located entry, NULL if not found.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* NA
	*/
	/* ARGSUSED */
	int
	zfs_lookup(znode_t zdp, char nm, znode_t *zpp, int flags, cred_t cr,
	int direntflags, pathname_t realpnp)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zdp);
	int error = 0;

	/*
	* Fast path lookup, however we must skip DNLC lookup
	* for case folding or normalizing lookups because the
	* DNLC code only stores the passed in name. This means
	* creating 'a' and removing 'A' on a case insensitive
	* file system would work, but DNLC still thinks 'a'
	* exists and won't let you create it again on the next
	* pass through fast path.
	*/
	if (!(flags & (LOOKUP_XATTR \| FIGNORECASE))) {

	if (!S_ISDIR(ZTOI(zdp)->i_mode)) {
	return (SET_ERROR(ENOTDIR));
	} else if (zdp->z_sa_hdl == NULL) {
	return (SET_ERROR(EIO));
	}

	if (nm[0] == 0 \|\| (nm[0] == '.' && nm[1] == '\0')) {
	error = zfs_fastaccesschk_execute(zdp, cr);
	if (!error) {
	*zpp = zdp;
	zhold(*zpp);
	return (0);
	}
	return (error);
	}
	}

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zdp);

	*zpp = NULL;

	if (flags & LOOKUP_XATTR) {
	/*
	* We don't allow recursive attributes..
	* Maybe someday we will.
	*/
	if (zdp->z_pflags & ZFS_XATTR) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	if ((error = zfs_get_xattrdir(zdp, zpp, cr, flags))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Do we have permission to get into attribute directory?
	*/

	if ((error = zfs_zaccess(*zpp, ACE_EXECUTE, 0,
	B_FALSE, cr))) {
	zrele(*zpp);
	*zpp = NULL;
	}

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if (!S_ISDIR(ZTOI(zdp)->i_mode)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(ENOTDIR));
	}

	/*
	* Check accessibility of directory.
	*/

	if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm),
	NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}

	error = zfs_dirlook(zdp, nm, zpp, flags, direntflags, realpnp);
	if ((error == 0) && (*zpp))
	zfs_znode_update_vfs(*zpp);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Attempt to create a new entry in a directory. If the entry
	* already exists, truncate the file if permissible, else return
	* an error. Return the ip of the created or trunc'd file.
	*
	* IN: dzp - znode of directory to put new file entry in.
	* name - name of new file entry.
	* vap - attributes of new file.
	* excl - flag indicating exclusive or non-exclusive mode.
	* mode - mode to open file with.
	* cr - credentials of caller.
	* flag - file flag.
	* vsecp - ACL to be set
	*
	* OUT: zpp - znode of created or trunc'd entry.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* dzp - ctime\|mtime updated if new entry created
	* zp - ctime\|mtime always, atime if new
	*/

	/* ARGSUSED */
	int
	zfs_create(znode_t dzp, char name, vattr_t *vap, int excl,
	int mode, znode_t *zpp, cred_t cr, int flag, vsecattr_t *vsecp)
	{
	znode_t *zp;
	zfsvfs_t *zfsvfs = ZTOZSB(dzp);
	zilog_t *zilog;
	objset_t *os;
	zfs_dirlock_t *dl;
	dmu_tx_t *tx;
	int error;
	uid_t uid;
	gid_t gid;
	zfs_acl_ids_t acl_ids;
	boolean_t fuid_dirtied;
	boolean_t have_acl = B_FALSE;
	boolean_t waited = B_FALSE;

	/*
	* If we have an ephemeral id, ACL, or XVATTR then
	* make sure file system is at proper version
	*/

	gid = crgetgid(cr);
	uid = crgetuid(cr);

	if (zfsvfs->z_use_fuids == B_FALSE &&
	(vsecp \|\| IS_EPHEMERAL(uid) \|\| IS_EPHEMERAL(gid)))
	return (SET_ERROR(EINVAL));

	if (name == NULL)
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	os = zfsvfs->z_os;
	zilog = zfsvfs->z_log;

	if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
	NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}

	if (vap->va_mask & ATTR_XVATTR) {
	if ((error = secpolicy_xvattr((xvattr_t *)vap,
	crgetuid(cr), cr, vap->va_mode)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	}

	top:
	*zpp = NULL;
	if (*name == '\0') {
	/*
	* Null component name refers to the directory itself.
	*/
	zhold(dzp);
	zp = dzp;
	dl = NULL;
	error = 0;
	} else {
	/* possible igrab(zp) */
	int zflg = 0;

	if (flag & FIGNORECASE)
	zflg \|= ZCILOOK;

	error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
	NULL, NULL);
	if (error) {
	if (have_acl)
	zfs_acl_ids_free(&acl_ids);
	if (strcmp(name, "..") == 0)
	error = SET_ERROR(EISDIR);
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	}

	if (zp == NULL) {
	uint64_t txtype;
	uint64_t projid = ZFS_DEFAULT_PROJID;

	/*
	* Create a new file object and update the directory
	* to reference it.
	*/
	if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
	if (have_acl)
	zfs_acl_ids_free(&acl_ids);
	goto out;
	}

	/*
	* We only support the creation of regular files in
	* extended attribute directories.
	*/

	if ((dzp->z_pflags & ZFS_XATTR) && !S_ISREG(vap->va_mode)) {
	if (have_acl)
	zfs_acl_ids_free(&acl_ids);
	error = SET_ERROR(EINVAL);
	goto out;
	}

	if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
	cr, vsecp, &acl_ids)) != 0)
	goto out;
	have_acl = B_TRUE;

	if (S_ISREG(vap->va_mode) \|\| S_ISDIR(vap->va_mode))
	projid = zfs_inherit_projid(dzp);
	if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
	zfs_acl_ids_free(&acl_ids);
	error = SET_ERROR(EDQUOT);
	goto out;
	}

	tx = dmu_tx_create(os);

	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
	ZFS_SA_BASE_ATTR_SIZE);

	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);
	dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
	dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
	if (!zfsvfs->z_use_sa &&
	acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
	0, acl_ids.z_aclp->z_acl_bytes);
	}

	error = dmu_tx_assign(tx,
	(waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	if (error) {
	zfs_dirent_unlock(dl);
	if (error == ERESTART) {
	waited = B_TRUE;
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	goto top;
	}
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_abort(tx);
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);

	error = zfs_link_create(dl, zp, tx, ZNEW);
	if (error != 0) {
	/*
	* Since, we failed to add the directory entry for it,
	* delete the newly created dnode.
	*/
	zfs_znode_delete(zp, tx);
	remove_inode_hash(ZTOI(zp));
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_commit(tx);
	goto out;
	}

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
	if (flag & FIGNORECASE)
	txtype \|= TX_CI;
	zfs_log_create(zilog, tx, txtype, dzp, zp, name,
	vsecp, acl_ids.z_fuidp, vap);
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_commit(tx);
	} else {
	int aflags = (flag & O_APPEND) ? V_APPEND : 0;

	if (have_acl)
	zfs_acl_ids_free(&acl_ids);
	have_acl = B_FALSE;

	/*
	* A directory entry already exists for this name.
	*/
	/*
	* Can't truncate an existing file if in exclusive mode.
	*/
	if (excl) {
	error = SET_ERROR(EEXIST);
	goto out;
	}
	/*
	* Can't open a directory for writing.
	*/
	if (S_ISDIR(ZTOI(zp)->i_mode)) {
	error = SET_ERROR(EISDIR);
	goto out;
	}
	/*
	* Verify requested access to file.
	*/
	if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) {
	goto out;
	}

	mutex_enter(&dzp->z_lock);
	dzp->z_seq++;
	mutex_exit(&dzp->z_lock);

	/*
	* Truncate regular files if requested.
	*/
	if (S_ISREG(ZTOI(zp)->i_mode) &&
	(vap->va_mask & ATTR_SIZE) && (vap->va_size == 0)) {
	/* we can't hold any locks when calling zfs_freesp() */
	if (dl) {
	zfs_dirent_unlock(dl);
	dl = NULL;
	}
	error = zfs_freesp(zp, 0, 0, mode, TRUE);
	}
	}
	out:

	if (dl)
	zfs_dirent_unlock(dl);

	if (error) {
	if (zp)
	zrele(zp);
	} else {
	zfs_znode_update_vfs(dzp);
	zfs_znode_update_vfs(zp);
	*zpp = zp;
	}

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/* ARGSUSED */
	int
	zfs_tmpfile(struct inode dip, vattr_t vap, int excl,
	int mode, struct inode *ipp, cred_t cr, int flag, vsecattr_t *vsecp)
	{
	znode_t zp = NULL, dzp = ITOZ(dip);
	zfsvfs_t *zfsvfs = ITOZSB(dip);
	objset_t *os;
	dmu_tx_t *tx;
	int error;
	uid_t uid;
	gid_t gid;
	zfs_acl_ids_t acl_ids;
	uint64_t projid = ZFS_DEFAULT_PROJID;
	boolean_t fuid_dirtied;
	boolean_t have_acl = B_FALSE;
	boolean_t waited = B_FALSE;

	/*
	* If we have an ephemeral id, ACL, or XVATTR then
	* make sure file system is at proper version
	*/

	gid = crgetgid(cr);
	uid = crgetuid(cr);

	if (zfsvfs->z_use_fuids == B_FALSE &&
	(vsecp \|\| IS_EPHEMERAL(uid) \|\| IS_EPHEMERAL(gid)))
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	os = zfsvfs->z_os;

	if (vap->va_mask & ATTR_XVATTR) {
	if ((error = secpolicy_xvattr((xvattr_t *)vap,
	crgetuid(cr), cr, vap->va_mode)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	}

	top:
	*ipp = NULL;

	/*
	* Create a new file object and update the directory
	* to reference it.
	*/
	if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
	if (have_acl)
	zfs_acl_ids_free(&acl_ids);
	goto out;
	}

	if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
	cr, vsecp, &acl_ids)) != 0)
	goto out;
	have_acl = B_TRUE;

	if (S_ISREG(vap->va_mode) \|\| S_ISDIR(vap->va_mode))
	projid = zfs_inherit_projid(dzp);
	if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
	zfs_acl_ids_free(&acl_ids);
	error = SET_ERROR(EDQUOT);
	goto out;
	}

	tx = dmu_tx_create(os);

	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
	ZFS_SA_BASE_ATTR_SIZE);
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);

	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);
	if (!zfsvfs->z_use_sa &&
	acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
	0, acl_ids.z_aclp->z_acl_bytes);
	}
	error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	if (error) {
	if (error == ERESTART) {
	waited = B_TRUE;
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	goto top;
	}
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_abort(tx);
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	zfs_mknode(dzp, vap, tx, cr, IS_TMPFILE, &zp, &acl_ids);

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	/* Add to unlinked set */
	zp->z_unlinked = B_TRUE;
	zfs_unlinked_add(zp, tx);
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_commit(tx);
	out:

	if (error) {
	if (zp)
	zrele(zp);
	} else {
	zfs_znode_update_vfs(dzp);
	zfs_znode_update_vfs(zp);
	*ipp = ZTOI(zp);
	}

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Remove an entry from a directory.
	*
	* IN: dzp - znode of directory to remove entry from.
	* name - name of entry to remove.
	* cr - credentials of caller.
	* flags - case flags.
	*
	* RETURN: 0 if success
	* error code if failure
	*
	* Timestamps:
	* dzp - ctime\|mtime
	* ip - ctime (if nlink > 0)
	*/

	uint64_t null_xattr = 0;

	/ARGSUSED/
	int
	zfs_remove(znode_t dzp, char name, cred_t *cr, int flags)
	{
	znode_t *zp;
	znode_t *xzp;
	zfsvfs_t *zfsvfs = ZTOZSB(dzp);
	zilog_t *zilog;
	uint64_t acl_obj, xattr_obj;
	uint64_t xattr_obj_unlinked = 0;
	uint64_t obj = 0;
	uint64_t links;
	zfs_dirlock_t *dl;
	dmu_tx_t *tx;
	boolean_t may_delete_now, delete_now = FALSE;
	boolean_t unlinked, toobig = FALSE;
	uint64_t txtype;
	pathname_t *realnmp = NULL;
	pathname_t realnm;
	int error;
	int zflg = ZEXISTS;
	boolean_t waited = B_FALSE;

	if (name == NULL)
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	zilog = zfsvfs->z_log;

	if (flags & FIGNORECASE) {
	zflg \|= ZCILOOK;
	pn_alloc(&realnm);
	realnmp = &realnm;
	}

	top:
	xattr_obj = 0;
	xzp = NULL;
	/*
	* Attempt to lock directory; fail if entry doesn't exist.
	*/
	if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
	NULL, realnmp))) {
	if (realnmp)
	pn_free(realnmp);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
	goto out;
	}

	/*
	* Need to use rmdir for removing directories.
	*/
	if (S_ISDIR(ZTOI(zp)->i_mode)) {
	error = SET_ERROR(EPERM);
	goto out;
	}

	mutex_enter(&zp->z_lock);
	may_delete_now = atomic_read(&ZTOI(zp)->i_count) == 1 &&
	!(zp->z_is_mapped);
	mutex_exit(&zp->z_lock);

	/*
	* We may delete the znode now, or we may put it in the unlinked set;
	* it depends on whether we're the last link, and on whether there are
	* other holds on the inode. So we dmu_tx_hold() the right things to
	* allow for either case.
	*/
	obj = zp->z_id;
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	zfs_sa_upgrade_txholds(tx, dzp);
	if (may_delete_now) {
	toobig = zp->z_size > zp->z_blksz * zfs_delete_blocks;
	/* if the file is too big, only hold_free a token amount */
	dmu_tx_hold_free(tx, zp->z_id, 0,
	(toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END));
	}

	/* are there any extended attributes? */
	error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
	&xattr_obj, sizeof (xattr_obj));
	if (error == 0 && xattr_obj) {
	error = zfs_zget(zfsvfs, xattr_obj, &xzp);
	ASSERT0(error);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
	dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
	}

	mutex_enter(&zp->z_lock);
	if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now)
	dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
	mutex_exit(&zp->z_lock);

	/* charge as an update -- would be nice not to charge at all */
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);

	/*
	* Mark this transaction as typically resulting in a net free of space
	*/
	dmu_tx_mark_netfree(tx);

	error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	if (error) {
	zfs_dirent_unlock(dl);
	if (error == ERESTART) {
	waited = B_TRUE;
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	zrele(zp);
	if (xzp)
	zrele(xzp);
	goto top;
	}
	if (realnmp)
	pn_free(realnmp);
	dmu_tx_abort(tx);
	zrele(zp);
	if (xzp)
	zrele(xzp);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Remove the directory entry.
	*/
	error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);

	if (error) {
	dmu_tx_commit(tx);
	goto out;
	}

	if (unlinked) {
	/*
	* Hold z_lock so that we can make sure that the ACL obj
	* hasn't changed. Could have been deleted due to
	* zfs_sa_upgrade().
	*/
	mutex_enter(&zp->z_lock);
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
	&xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
	delete_now = may_delete_now && !toobig &&
	atomic_read(&ZTOI(zp)->i_count) == 1 &&
	!(zp->z_is_mapped) && xattr_obj == xattr_obj_unlinked &&
	zfs_external_acl(zp) == acl_obj;
	}

	if (delete_now) {
	if (xattr_obj_unlinked) {
	ASSERT3U(ZTOI(xzp)->i_nlink, ==, 2);
	mutex_enter(&xzp->z_lock);
	xzp->z_unlinked = B_TRUE;
	clear_nlink(ZTOI(xzp));
	links = 0;
	error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
	&links, sizeof (links), tx);
	ASSERT3U(error, ==, 0);
	mutex_exit(&xzp->z_lock);
	zfs_unlinked_add(xzp, tx);

	if (zp->z_is_sa)
	error = sa_remove(zp->z_sa_hdl,
	SA_ZPL_XATTR(zfsvfs), tx);
	else
	error = sa_update(zp->z_sa_hdl,
	SA_ZPL_XATTR(zfsvfs), &null_xattr,
	sizeof (uint64_t), tx);
	ASSERT0(error);
	}
	/*
	* Add to the unlinked set because a new reference could be
	* taken concurrently resulting in a deferred destruction.
	*/
	zfs_unlinked_add(zp, tx);
	mutex_exit(&zp->z_lock);
	} else if (unlinked) {
	mutex_exit(&zp->z_lock);
	zfs_unlinked_add(zp, tx);
	}

	txtype = TX_REMOVE;
	if (flags & FIGNORECASE)
	txtype \|= TX_CI;
	zfs_log_remove(zilog, tx, txtype, dzp, name, obj, unlinked);

	dmu_tx_commit(tx);
	out:
	if (realnmp)
	pn_free(realnmp);

	zfs_dirent_unlock(dl);
	zfs_znode_update_vfs(dzp);
	zfs_znode_update_vfs(zp);

	if (delete_now)
	zrele(zp);
	else
	zfs_zrele_async(zp);

	if (xzp) {
	zfs_znode_update_vfs(xzp);
	zfs_zrele_async(xzp);
	}

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Create a new directory and insert it into dzp using the name
	* provided. Return a pointer to the inserted directory.
	*
	* IN: dzp - znode of directory to add subdir to.
	* dirname - name of new directory.
	* vap - attributes of new directory.
	* cr - credentials of caller.
	* flags - case flags.
	* vsecp - ACL to be set
	*
	* OUT: zpp - znode of created directory.
	*
	* RETURN: 0 if success
	* error code if failure
	*
	* Timestamps:
	* dzp - ctime\|mtime updated
	* zpp - ctime\|mtime\|atime updated
	*/
	/ARGSUSED/
	int
	zfs_mkdir(znode_t dzp, char dirname, vattr_t vap, znode_t *zpp,
	cred_t cr, int flags, vsecattr_t vsecp)
	{
	znode_t *zp;
	zfsvfs_t *zfsvfs = ZTOZSB(dzp);
	zilog_t *zilog;
	zfs_dirlock_t *dl;
	uint64_t txtype;
	dmu_tx_t *tx;
	int error;
	int zf = ZNEW;
	uid_t uid;
	gid_t gid = crgetgid(cr);
	zfs_acl_ids_t acl_ids;
	boolean_t fuid_dirtied;
	boolean_t waited = B_FALSE;

	ASSERT(S_ISDIR(vap->va_mode));

	/*
	* If we have an ephemeral id, ACL, or XVATTR then
	* make sure file system is at proper version
	*/

	uid = crgetuid(cr);
	if (zfsvfs->z_use_fuids == B_FALSE &&
	(vsecp \|\| IS_EPHEMERAL(uid) \|\| IS_EPHEMERAL(gid)))
	return (SET_ERROR(EINVAL));

	if (dirname == NULL)
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	zilog = zfsvfs->z_log;

	if (dzp->z_pflags & ZFS_XATTR) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	if (zfsvfs->z_utf8 && u8_validate(dirname,
	strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}
	if (flags & FIGNORECASE)
	zf \|= ZCILOOK;

	if (vap->va_mask & ATTR_XVATTR) {
	if ((error = secpolicy_xvattr((xvattr_t *)vap,
	crgetuid(cr), cr, vap->va_mode)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	}

	if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
	vsecp, &acl_ids)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	/*
	* First make sure the new directory doesn't exist.
	*
	* Existence is checked first to make sure we don't return
	* EACCES instead of EEXIST which can cause some applications
	* to fail.
	*/
	top:
	*zpp = NULL;

	if ((error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf,
	NULL, NULL))) {
	zfs_acl_ids_free(&acl_ids);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if ((error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr))) {
	zfs_acl_ids_free(&acl_ids);
	zfs_dirent_unlock(dl);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, zfs_inherit_projid(dzp))) {
	zfs_acl_ids_free(&acl_ids);
	zfs_dirent_unlock(dl);
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EDQUOT));
	}

	/*
	* Add a new entry to the directory.
	*/
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
	dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);
	if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
	acl_ids.z_aclp->z_acl_bytes);
	}

	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
	ZFS_SA_BASE_ATTR_SIZE);

	error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	if (error) {
	zfs_dirent_unlock(dl);
	if (error == ERESTART) {
	waited = B_TRUE;
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	goto top;
	}
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_abort(tx);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Create new node.
	*/
	zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);

	/*
	* Now put new name in parent dir.
	*/
	error = zfs_link_create(dl, zp, tx, ZNEW);
	if (error != 0) {
	zfs_znode_delete(zp, tx);
	remove_inode_hash(ZTOI(zp));
	goto out;
	}

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	*zpp = zp;

	txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap);
	if (flags & FIGNORECASE)
	txtype \|= TX_CI;
	zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp,
	acl_ids.z_fuidp, vap);

	out:
	zfs_acl_ids_free(&acl_ids);

	dmu_tx_commit(tx);

	zfs_dirent_unlock(dl);

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	if (error != 0) {
	zrele(zp);
	} else {
	zfs_znode_update_vfs(dzp);
	zfs_znode_update_vfs(zp);
	}
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Remove a directory subdir entry. If the current working
	* directory is the same as the subdir to be removed, the
	* remove will fail.
	*
	* IN: dzp - znode of directory to remove from.
	* name - name of directory to be removed.
	* cwd - inode of current working directory.
	* cr - credentials of caller.
	* flags - case flags
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* dzp - ctime\|mtime updated
	*/
	/ARGSUSED/
	int
	zfs_rmdir(znode_t dzp, char name, znode_t cwd, cred_t cr,
	int flags)
	{
	znode_t *zp;
	zfsvfs_t *zfsvfs = ZTOZSB(dzp);
	zilog_t *zilog;
	zfs_dirlock_t *dl;
	dmu_tx_t *tx;
	int error;
	int zflg = ZEXISTS;
	boolean_t waited = B_FALSE;

	if (name == NULL)
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	zilog = zfsvfs->z_log;

	if (flags & FIGNORECASE)
	zflg \|= ZCILOOK;
	top:
	zp = NULL;

	/*
	* Attempt to lock directory; fail if entry doesn't exist.
	*/
	if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
	NULL, NULL))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
	goto out;
	}

	if (!S_ISDIR(ZTOI(zp)->i_mode)) {
	error = SET_ERROR(ENOTDIR);
	goto out;
	}

	if (zp == cwd) {
	error = SET_ERROR(EINVAL);
	goto out;
	}

	/*
	* Grab a lock on the directory to make sure that no one is
	* trying to add (or lookup) entries while we are removing it.
	*/
	rw_enter(&zp->z_name_lock, RW_WRITER);

	/*
	* Grab a lock on the parent pointer to make sure we play well
	* with the treewalk and directory rename code.
	*/
	rw_enter(&zp->z_parent_lock, RW_WRITER);

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
	zfs_sa_upgrade_txholds(tx, zp);
	zfs_sa_upgrade_txholds(tx, dzp);
	dmu_tx_mark_netfree(tx);
	error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	if (error) {
	rw_exit(&zp->z_parent_lock);
	rw_exit(&zp->z_name_lock);
	zfs_dirent_unlock(dl);
	if (error == ERESTART) {
	waited = B_TRUE;
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	zrele(zp);
	goto top;
	}
	dmu_tx_abort(tx);
	zrele(zp);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	error = zfs_link_destroy(dl, zp, tx, zflg, NULL);

	if (error == 0) {
	uint64_t txtype = TX_RMDIR;
	if (flags & FIGNORECASE)
	txtype \|= TX_CI;
	zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT,
	B_FALSE);
	}

	dmu_tx_commit(tx);

	rw_exit(&zp->z_parent_lock);
	rw_exit(&zp->z_name_lock);
	out:
	zfs_dirent_unlock(dl);

	zfs_znode_update_vfs(dzp);
	zfs_znode_update_vfs(zp);
	zrele(zp);

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Read directory entries from the given directory cursor position and emit
	* name and position for each entry.
	*
	* IN: ip - inode of directory to read.
	* ctx - directory entry context.
	* cr - credentials of caller.
	*
	* RETURN: 0 if success
	* error code if failure
	*
	* Timestamps:
	* ip - atime updated
	*
	* Note that the low 4 bits of the cookie returned by zap is always zero.
	* This allows us to use the low range for "special" directory entries:
	* We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
	* we use the offset 2 for the '.zfs' directory.
	*/
	/* ARGSUSED */
	int
	zfs_readdir(struct inode ip, zpl_dir_context_t ctx, cred_t *cr)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	objset_t *os;
	zap_cursor_t zc;
	zap_attribute_t zap;
	int error;
	uint8_t prefetch;
	uint8_t type;
	int done = 0;
	uint64_t parent;
	uint64_t offset; /* must be unsigned; checks for < 1 */

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
	&parent, sizeof (parent))) != 0)
	goto out;

	/*
	* Quit if directory has been removed (posix)
	*/
	if (zp->z_unlinked)
	goto out;

	error = 0;
	os = zfsvfs->z_os;
	offset = ctx->pos;
	prefetch = zp->z_zn_prefetch;

	/*
	* Initialize the iterator cursor.
	*/
	if (offset <= 3) {
	/*
	* Start iteration from the beginning of the directory.
	*/
	zap_cursor_init(&zc, os, zp->z_id);
	} else {
	/*
	* The offset is a serialized cursor.
	*/
	zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
	}

	/*
	* Transform to file-system independent format
	*/
	while (!done) {
	uint64_t objnum;
	/*
	* Special case `.', `..', and `.zfs'.
	*/
	if (offset == 0) {
	(void) strcpy(zap.za_name, ".");
	zap.za_normalization_conflict = 0;
	objnum = zp->z_id;
	type = DT_DIR;
	} else if (offset == 1) {
	(void) strcpy(zap.za_name, "..");
	zap.za_normalization_conflict = 0;
	objnum = parent;
	type = DT_DIR;
	} else if (offset == 2 && zfs_show_ctldir(zp)) {
	(void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
	zap.za_normalization_conflict = 0;
	objnum = ZFSCTL_INO_ROOT;
	type = DT_DIR;
	} else {
	/*
	* Grab next entry.
	*/
	if ((error = zap_cursor_retrieve(&zc, &zap))) {
	if (error == ENOENT)
	break;
	else
	goto update;
	}

	/*
	* Allow multiple entries provided the first entry is
	* the object id. Non-zpl consumers may safely make
	* use of the additional space.
	*
	* XXX: This should be a feature flag for compatibility
	*/
	if (zap.za_integer_length != 8 \|\|
	zap.za_num_integers == 0) {
	cmn_err(CE_WARN, "zap_readdir: bad directory "
	"entry, obj = %lld, offset = %lld, "
	"length = %d, num = %lld\n",
	(u_longlong_t)zp->z_id,
	(u_longlong_t)offset,
	zap.za_integer_length,
	(u_longlong_t)zap.za_num_integers);
	error = SET_ERROR(ENXIO);
	goto update;
	}

	objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
	type = ZFS_DIRENT_TYPE(zap.za_first_integer);
	}

	done = !zpl_dir_emit(ctx, zap.za_name, strlen(zap.za_name),
	objnum, type);
	if (done)
	break;

	/* Prefetch znode */
	if (prefetch) {
	dmu_prefetch(os, objnum, 0, 0, 0,
	ZIO_PRIORITY_SYNC_READ);
	}

	/*
	* Move to the next entry, fill in the previous offset.
	*/
	if (offset > 2 \|\| (offset == 2 && !zfs_show_ctldir(zp))) {
	zap_cursor_advance(&zc);
	offset = zap_cursor_serialize(&zc);
	} else {
	offset += 1;
	}
	ctx->pos = offset;
	}
	zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */

	update:
	zap_cursor_fini(&zc);
	if (error == ENOENT)
	error = 0;
	out:
	ZFS_EXIT(zfsvfs);

	return (error);
	}

	/*
	* Get the basic file attributes and place them in the provided kstat
	* structure. The inode is assumed to be the authoritative source
	* for most of the attributes. However, the znode currently has the
	* authoritative atime, blksize, and block count.
	*
	* IN: ip - inode of file.
	*
	* OUT: sp - kstat values.
	*
	* RETURN: 0 (always succeeds)
	*/
	/* ARGSUSED */
	int
	zfs_getattr_fast(struct user_namespace user_ns, struct inode ip,
	struct kstat *sp)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	uint32_t blksize;
	u_longlong_t nblocks;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	mutex_enter(&zp->z_lock);

	zpl_generic_fillattr(user_ns, ip, sp);
	/*
	* +1 link count for root inode with visible '.zfs' directory.
	*/
	if ((zp->z_id == zfsvfs->z_root) && zfs_show_ctldir(zp))
	if (sp->nlink < ZFS_LINK_MAX)
	sp->nlink++;

	sa_object_size(zp->z_sa_hdl, &blksize, &nblocks);
	sp->blksize = blksize;
	sp->blocks = nblocks;

	if (unlikely(zp->z_blksz == 0)) {
	/*
	* Block size hasn't been set; suggest maximal I/O transfers.
	*/
	sp->blksize = zfsvfs->z_max_blksz;
	}

	mutex_exit(&zp->z_lock);

	/*
	* Required to prevent NFS client from detecting different inode
	* numbers of snapshot root dentry before and after snapshot mount.
	*/
	if (zfsvfs->z_issnap) {
	if (ip->i_sb->s_root->d_inode == ip)
	sp->ino = ZFSCTL_INO_SNAPDIRS -
	dmu_objset_id(zfsvfs->z_os);
	}

	ZFS_EXIT(zfsvfs);

	return (0);
	}

	/*
	* For the operation of changing file's user/group/project, we need to
	* handle not only the main object that is assigned to the file directly,
	* but also the ones that are used by the file via hidden xattr directory.
	*
	* Because the xattr directory may contains many EA entries, as to it may
	* be impossible to change all of them via the transaction of changing the
	* main object's user/group/project attributes. Then we have to change them
	* via other multiple independent transactions one by one. It may be not good
	* solution, but we have no better idea yet.
	*/
	static int
	zfs_setattr_dir(znode_t *dzp)
	{
	struct inode *dxip = ZTOI(dzp);
	struct inode *xip = NULL;
	zfsvfs_t *zfsvfs = ZTOZSB(dzp);
	objset_t *os = zfsvfs->z_os;
	zap_cursor_t zc;
	zap_attribute_t zap;
	zfs_dirlock_t *dl;
	znode_t *zp = NULL;
	dmu_tx_t *tx = NULL;
	uint64_t uid, gid;
	sa_bulk_attr_t bulk[4];
	int count;
	int err;

	zap_cursor_init(&zc, os, dzp->z_id);
	while ((err = zap_cursor_retrieve(&zc, &zap)) == 0) {
	count = 0;
	if (zap.za_integer_length != 8 \|\| zap.za_num_integers != 1) {
	err = ENXIO;
	break;
	}

	err = zfs_dirent_lock(&dl, dzp, (char *)zap.za_name, &zp,
	ZEXISTS, NULL, NULL);
	if (err == ENOENT)
	goto next;
	if (err)
	break;

	xip = ZTOI(zp);
	if (KUID_TO_SUID(xip->i_uid) == KUID_TO_SUID(dxip->i_uid) &&
	KGID_TO_SGID(xip->i_gid) == KGID_TO_SGID(dxip->i_gid) &&
	zp->z_projid == dzp->z_projid)
	goto next;

	tx = dmu_tx_create(os);
	if (!(zp->z_pflags & ZFS_PROJID))
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
	else
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);

	err = dmu_tx_assign(tx, TXG_WAIT);
	if (err)
	break;

	mutex_enter(&dzp->z_lock);

	if (KUID_TO_SUID(xip->i_uid) != KUID_TO_SUID(dxip->i_uid)) {
	xip->i_uid = dxip->i_uid;
	uid = zfs_uid_read(dxip);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
	&uid, sizeof (uid));
	}

	if (KGID_TO_SGID(xip->i_gid) != KGID_TO_SGID(dxip->i_gid)) {
	xip->i_gid = dxip->i_gid;
	gid = zfs_gid_read(dxip);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
	&gid, sizeof (gid));
	}

	if (zp->z_projid != dzp->z_projid) {
	if (!(zp->z_pflags & ZFS_PROJID)) {
	zp->z_pflags \|= ZFS_PROJID;
	SA_ADD_BULK_ATTR(bulk, count,
	SA_ZPL_FLAGS(zfsvfs), NULL, &zp->z_pflags,
	sizeof (zp->z_pflags));
	}

	zp->z_projid = dzp->z_projid;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PROJID(zfsvfs),
	NULL, &zp->z_projid, sizeof (zp->z_projid));
	}

	mutex_exit(&dzp->z_lock);

	if (likely(count > 0)) {
	err = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
	dmu_tx_commit(tx);
	} else {
	dmu_tx_abort(tx);
	}
	tx = NULL;
	if (err != 0 && err != ENOENT)
	break;

	next:
	if (zp) {
	zrele(zp);
	zp = NULL;
	zfs_dirent_unlock(dl);
	}
	zap_cursor_advance(&zc);
	}

	if (tx)
	dmu_tx_abort(tx);
	if (zp) {
	zrele(zp);
	zfs_dirent_unlock(dl);
	}
	zap_cursor_fini(&zc);

	return (err == ENOENT ? 0 : err);
	}

	/*
	* Set the file attributes to the values contained in the
	* vattr structure.
	*
	* IN: zp - znode of file to be modified.
	* vap - new attribute values.
	* If ATTR_XVATTR set, then optional attrs are being set
	* flags - ATTR_UTIME set if non-default time values provided.
	* - ATTR_NOACLCHECK (CIFS context only).
	* cr - credentials of caller.
	*
	* RETURN: 0 if success
	* error code if failure
	*
	* Timestamps:
	* ip - ctime updated, mtime updated if size changed.
	*/
	/* ARGSUSED */
	int
	zfs_setattr(znode_t zp, vattr_t vap, int flags, cred_t *cr)
	{
	struct inode *ip;
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	objset_t *os = zfsvfs->z_os;
	zilog_t *zilog;
	dmu_tx_t *tx;
	vattr_t oldva;
	xvattr_t *tmpxvattr;
	uint_t mask = vap->va_mask;
	uint_t saved_mask = 0;
	int trim_mask = 0;
	uint64_t new_mode;
	uint64_t new_kuid = 0, new_kgid = 0, new_uid, new_gid;
	uint64_t xattr_obj;
	uint64_t mtime[2], ctime[2], atime[2];
	uint64_t projid = ZFS_INVALID_PROJID;
	znode_t *attrzp;
	int need_policy = FALSE;
	int err, err2 = 0;
	zfs_fuid_info_t *fuidp = NULL;
	xvattr_t xvap = (xvattr_t )vap; /* vap may be an xvattr_t * */
	xoptattr_t *xoap;
	zfs_acl_t *aclp;
	boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
	boolean_t fuid_dirtied = B_FALSE;
	boolean_t handle_eadir = B_FALSE;
	sa_bulk_attr_t bulk, xattr_bulk;
	int count = 0, xattr_count = 0, bulks = 8;

	if (mask == 0)
	return (0);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);
	ip = ZTOI(zp);

	/*
	* If this is a xvattr_t, then get a pointer to the structure of
	* optional attributes. If this is NULL, then we have a vattr_t.
	*/
	xoap = xva_getxoptattr(xvap);
	if (xoap != NULL && (mask & ATTR_XVATTR)) {
	if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
	if (!dmu_objset_projectquota_enabled(os) \|\|
	(!S_ISREG(ip->i_mode) && !S_ISDIR(ip->i_mode))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(ENOTSUP));
	}

	projid = xoap->xoa_projid;
	if (unlikely(projid == ZFS_INVALID_PROJID)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	if (projid == zp->z_projid && zp->z_pflags & ZFS_PROJID)
	projid = ZFS_INVALID_PROJID;
	else
	need_policy = TRUE;
	}

	if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT) &&
	(xoap->xoa_projinherit !=
	((zp->z_pflags & ZFS_PROJINHERIT) != 0)) &&
	(!dmu_objset_projectquota_enabled(os) \|\|
	(!S_ISREG(ip->i_mode) && !S_ISDIR(ip->i_mode)))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(ENOTSUP));
	}
	}

	zilog = zfsvfs->z_log;

	/*
	* Make sure that if we have ephemeral uid/gid or xvattr specified
	* that file system is at proper version level
	*/

	if (zfsvfs->z_use_fuids == B_FALSE &&
	(((mask & ATTR_UID) && IS_EPHEMERAL(vap->va_uid)) \|\|
	((mask & ATTR_GID) && IS_EPHEMERAL(vap->va_gid)) \|\|
	(mask & ATTR_XVATTR))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	if (mask & ATTR_SIZE && S_ISDIR(ip->i_mode)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EISDIR));
	}

	if (mask & ATTR_SIZE && !S_ISREG(ip->i_mode) && !S_ISFIFO(ip->i_mode)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	tmpxvattr = kmem_alloc(sizeof (xvattr_t), KM_SLEEP);
	xva_init(tmpxvattr);

	bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * bulks, KM_SLEEP);
	xattr_bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * bulks, KM_SLEEP);

	/*
	* Immutable files can only alter immutable bit and atime
	*/
	if ((zp->z_pflags & ZFS_IMMUTABLE) &&
	((mask & (ATTR_SIZE\|ATTR_UID\|ATTR_GID\|ATTR_MTIME\|ATTR_MODE)) \|\|
	((mask & ATTR_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
	err = SET_ERROR(EPERM);
	goto out3;
	}

	if ((mask & ATTR_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
	err = SET_ERROR(EPERM);
	goto out3;
	}

	/*
	* Verify timestamps doesn't overflow 32 bits.
	* ZFS can handle large timestamps, but 32bit syscalls can't
	* handle times greater than 2039. This check should be removed
	* once large timestamps are fully supported.
	*/
	if (mask & (ATTR_ATIME \| ATTR_MTIME)) {
	if (((mask & ATTR_ATIME) &&
	TIMESPEC_OVERFLOW(&vap->va_atime)) \|\|
	((mask & ATTR_MTIME) &&
	TIMESPEC_OVERFLOW(&vap->va_mtime))) {
	err = SET_ERROR(EOVERFLOW);
	goto out3;
	}
	}

	top:
	attrzp = NULL;
	aclp = NULL;

	/* Can this be moved to before the top label? */
	if (zfs_is_readonly(zfsvfs)) {
	err = SET_ERROR(EROFS);
	goto out3;
	}

	/*
	* First validate permissions
	*/

	if (mask & ATTR_SIZE) {
	err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
	if (err)
	goto out3;

	/*
	* XXX - Note, we are not providing any open
	* mode flags here (like FNDELAY), so we may
	* block if there are locks present... this
	* should be addressed in openat().
	*/
	/* XXX - would it be OK to generate a log record here? */
	err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
	if (err)
	goto out3;
	}

	if (mask & (ATTR_ATIME\|ATTR_MTIME) \|\|
	((mask & ATTR_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) \|\|
	XVA_ISSET_REQ(xvap, XAT_READONLY) \|\|
	XVA_ISSET_REQ(xvap, XAT_ARCHIVE) \|\|
	XVA_ISSET_REQ(xvap, XAT_OFFLINE) \|\|
	XVA_ISSET_REQ(xvap, XAT_SPARSE) \|\|
	XVA_ISSET_REQ(xvap, XAT_CREATETIME) \|\|
	XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
	need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
	skipaclchk, cr);
	}

	if (mask & (ATTR_UID\|ATTR_GID)) {
	int idmask = (mask & (ATTR_UID\|ATTR_GID));
	int take_owner;
	int take_group;

	/*
	* NOTE: even if a new mode is being set,
	* we may clear S_ISUID/S_ISGID bits.
	*/

	if (!(mask & ATTR_MODE))
	vap->va_mode = zp->z_mode;

	/*
	* Take ownership or chgrp to group we are a member of
	*/

	take_owner = (mask & ATTR_UID) && (vap->va_uid == crgetuid(cr));
	take_group = (mask & ATTR_GID) &&
	zfs_groupmember(zfsvfs, vap->va_gid, cr);

	/*
	* If both ATTR_UID and ATTR_GID are set then take_owner and
	* take_group must both be set in order to allow taking
	* ownership.
	*
	* Otherwise, send the check through secpolicy_vnode_setattr()
	*
	*/

	if (((idmask == (ATTR_UID\|ATTR_GID)) &&
	take_owner && take_group) \|\|
	((idmask == ATTR_UID) && take_owner) \|\|
	((idmask == ATTR_GID) && take_group)) {
	if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
	skipaclchk, cr) == 0) {
	/*
	* Remove setuid/setgid for non-privileged users
	*/
	(void) secpolicy_setid_clear(vap, cr);
	trim_mask = (mask & (ATTR_UID\|ATTR_GID));
	} else {
	need_policy = TRUE;
	}
	} else {
	need_policy = TRUE;
	}
	}

	mutex_enter(&zp->z_lock);
	oldva.va_mode = zp->z_mode;
	zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
	if (mask & ATTR_XVATTR) {
	/*
	* Update xvattr mask to include only those attributes
	* that are actually changing.
	*
	* the bits will be restored prior to actually setting
	* the attributes so the caller thinks they were set.
	*/
	if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
	if (xoap->xoa_appendonly !=
	((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_APPENDONLY);
	XVA_SET_REQ(tmpxvattr, XAT_APPENDONLY);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
	if (xoap->xoa_projinherit !=
	((zp->z_pflags & ZFS_PROJINHERIT) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_PROJINHERIT);
	XVA_SET_REQ(tmpxvattr, XAT_PROJINHERIT);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
	if (xoap->xoa_nounlink !=
	((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_NOUNLINK);
	XVA_SET_REQ(tmpxvattr, XAT_NOUNLINK);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
	if (xoap->xoa_immutable !=
	((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
	XVA_SET_REQ(tmpxvattr, XAT_IMMUTABLE);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
	if (xoap->xoa_nodump !=
	((zp->z_pflags & ZFS_NODUMP) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_NODUMP);
	XVA_SET_REQ(tmpxvattr, XAT_NODUMP);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
	if (xoap->xoa_av_modified !=
	((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
	XVA_SET_REQ(tmpxvattr, XAT_AV_MODIFIED);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
	if ((!S_ISREG(ip->i_mode) &&
	xoap->xoa_av_quarantined) \|\|
	xoap->xoa_av_quarantined !=
	((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
	need_policy = TRUE;
	} else {
	XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
	XVA_SET_REQ(tmpxvattr, XAT_AV_QUARANTINED);
	}
	}

	if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
	mutex_exit(&zp->z_lock);
	err = SET_ERROR(EPERM);
	goto out3;
	}

	if (need_policy == FALSE &&
	(XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) \|\|
	XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
	need_policy = TRUE;
	}
	}

	mutex_exit(&zp->z_lock);

	if (mask & ATTR_MODE) {
	if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
	err = secpolicy_setid_setsticky_clear(ip, vap,
	&oldva, cr);
	if (err)
	goto out3;

	trim_mask \|= ATTR_MODE;
	} else {
	need_policy = TRUE;
	}
	}

	if (need_policy) {
	/*
	* If trim_mask is set then take ownership
	* has been granted or write_acl is present and user
	* has the ability to modify mode. In that case remove
	* UID\|GID and or MODE from mask so that
	* secpolicy_vnode_setattr() doesn't revoke it.
	*/

	if (trim_mask) {
	saved_mask = vap->va_mask;
	vap->va_mask &= ~trim_mask;
	}
	err = secpolicy_vnode_setattr(cr, ip, vap, &oldva, flags,
	(int ()(void , int, cred_t *))zfs_zaccess_unix, zp);
	if (err)
	goto out3;

	if (trim_mask)
	vap->va_mask \|= saved_mask;
	}

	/*
	* secpolicy_vnode_setattr, or take ownership may have
	* changed va_mask
	*/
	mask = vap->va_mask;

	if ((mask & (ATTR_UID \| ATTR_GID)) \|\| projid != ZFS_INVALID_PROJID) {
	handle_eadir = B_TRUE;
	err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
	&xattr_obj, sizeof (xattr_obj));

	if (err == 0 && xattr_obj) {
	err = zfs_zget(ZTOZSB(zp), xattr_obj, &attrzp);
	if (err)
	goto out2;
	}
	if (mask & ATTR_UID) {
	new_kuid = zfs_fuid_create(zfsvfs,
	(uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
	if (new_kuid != KUID_TO_SUID(ZTOI(zp)->i_uid) &&
	zfs_id_overquota(zfsvfs, DMU_USERUSED_OBJECT,
	new_kuid)) {
	if (attrzp)
	zrele(attrzp);
	err = SET_ERROR(EDQUOT);
	goto out2;
	}
	}

	if (mask & ATTR_GID) {
	new_kgid = zfs_fuid_create(zfsvfs,
	(uint64_t)vap->va_gid, cr, ZFS_GROUP, &fuidp);
	if (new_kgid != KGID_TO_SGID(ZTOI(zp)->i_gid) &&
	zfs_id_overquota(zfsvfs, DMU_GROUPUSED_OBJECT,
	new_kgid)) {
	if (attrzp)
	zrele(attrzp);
	err = SET_ERROR(EDQUOT);
	goto out2;
	}
	}

	if (projid != ZFS_INVALID_PROJID &&
	zfs_id_overquota(zfsvfs, DMU_PROJECTUSED_OBJECT, projid)) {
	if (attrzp)
	zrele(attrzp);
	err = EDQUOT;
	goto out2;
	}
	}
	tx = dmu_tx_create(os);

	if (mask & ATTR_MODE) {
	uint64_t pmode = zp->z_mode;
	uint64_t acl_obj;
	new_mode = (pmode & S_IFMT) \| (vap->va_mode & ~S_IFMT);

	if (ZTOZSB(zp)->z_acl_mode == ZFS_ACL_RESTRICTED &&
	!(zp->z_pflags & ZFS_ACL_TRIVIAL)) {
	err = EPERM;
	goto out;
	}

	if ((err = zfs_acl_chmod_setattr(zp, &aclp, new_mode)))
	goto out;

	mutex_enter(&zp->z_lock);
	if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
	/*
	* Are we upgrading ACL from old V0 format
	* to V1 format?
	*/
	if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
	zfs_znode_acl_version(zp) ==
	ZFS_ACL_VERSION_INITIAL) {
	dmu_tx_hold_free(tx, acl_obj, 0,
	DMU_OBJECT_END);
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
	0, aclp->z_acl_bytes);
	} else {
	dmu_tx_hold_write(tx, acl_obj, 0,
	aclp->z_acl_bytes);
	}
	} else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
	0, aclp->z_acl_bytes);
	}
	mutex_exit(&zp->z_lock);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
	} else {
	if (((mask & ATTR_XVATTR) &&
	XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) \|\|
	(projid != ZFS_INVALID_PROJID &&
	!(zp->z_pflags & ZFS_PROJID)))
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
	else
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	}

	if (attrzp) {
	dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
	}

	fuid_dirtied = zfsvfs->z_fuid_dirty;
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);

	zfs_sa_upgrade_txholds(tx, zp);

	err = dmu_tx_assign(tx, TXG_WAIT);
	if (err)
	goto out;

	count = 0;
	/*
	* Set each attribute requested.
	* We group settings according to the locks they need to acquire.
	*
	* Note: you cannot set ctime directly, although it will be
	* updated as a side-effect of calling this function.
	*/

	if (projid != ZFS_INVALID_PROJID && !(zp->z_pflags & ZFS_PROJID)) {
	/*
	* For the existed object that is upgraded from old system,
	* its on-disk layout has no slot for the project ID attribute.
	* But quota accounting logic needs to access related slots by
	* offset directly. So we need to adjust old objects' layout
	* to make the project ID to some unified and fixed offset.
	*/
	if (attrzp)
	err = sa_add_projid(attrzp->z_sa_hdl, tx, projid);
	if (err == 0)
	err = sa_add_projid(zp->z_sa_hdl, tx, projid);

	if (unlikely(err == EEXIST))
	err = 0;
	else if (err != 0)
	goto out;
	else
	projid = ZFS_INVALID_PROJID;
	}

	if (mask & (ATTR_UID\|ATTR_GID\|ATTR_MODE))
	mutex_enter(&zp->z_acl_lock);
	mutex_enter(&zp->z_lock);

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, sizeof (zp->z_pflags));

	if (attrzp) {
	if (mask & (ATTR_UID\|ATTR_GID\|ATTR_MODE))
	mutex_enter(&attrzp->z_acl_lock);
	mutex_enter(&attrzp->z_lock);
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags,
	sizeof (attrzp->z_pflags));
	if (projid != ZFS_INVALID_PROJID) {
	attrzp->z_projid = projid;
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_PROJID(zfsvfs), NULL, &attrzp->z_projid,
	sizeof (attrzp->z_projid));
	}
	}

	if (mask & (ATTR_UID\|ATTR_GID)) {

	if (mask & ATTR_UID) {
	ZTOI(zp)->i_uid = SUID_TO_KUID(new_kuid);
	new_uid = zfs_uid_read(ZTOI(zp));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
	&new_uid, sizeof (new_uid));
	if (attrzp) {
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_UID(zfsvfs), NULL, &new_uid,
	sizeof (new_uid));
	ZTOI(attrzp)->i_uid = SUID_TO_KUID(new_uid);
	}
	}

	if (mask & ATTR_GID) {
	ZTOI(zp)->i_gid = SGID_TO_KGID(new_kgid);
	new_gid = zfs_gid_read(ZTOI(zp));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs),
	NULL, &new_gid, sizeof (new_gid));
	if (attrzp) {
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_GID(zfsvfs), NULL, &new_gid,
	sizeof (new_gid));
	ZTOI(attrzp)->i_gid = SGID_TO_KGID(new_kgid);
	}
	}
	if (!(mask & ATTR_MODE)) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs),
	NULL, &new_mode, sizeof (new_mode));
	new_mode = zp->z_mode;
	}
	err = zfs_acl_chown_setattr(zp);
	ASSERT(err == 0);
	if (attrzp) {
	err = zfs_acl_chown_setattr(attrzp);
	ASSERT(err == 0);
	}
	}

	if (mask & ATTR_MODE) {
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
	&new_mode, sizeof (new_mode));
	zp->z_mode = ZTOI(zp)->i_mode = new_mode;
	ASSERT3P(aclp, !=, NULL);
	err = zfs_aclset_common(zp, aclp, cr, tx);
	ASSERT0(err);
	if (zp->z_acl_cached)
	zfs_acl_free(zp->z_acl_cached);
	zp->z_acl_cached = aclp;
	aclp = NULL;
	}

	if ((mask & ATTR_ATIME) \|\| zp->z_atime_dirty) {
	zp->z_atime_dirty = B_FALSE;
	ZFS_TIME_ENCODE(&ip->i_atime, atime);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
	&atime, sizeof (atime));
	}

	if (mask & (ATTR_MTIME \| ATTR_SIZE)) {
	ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
	ZTOI(zp)->i_mtime = zpl_inode_timestamp_truncate(
	vap->va_mtime, ZTOI(zp));

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
	mtime, sizeof (mtime));
	}

	if (mask & (ATTR_CTIME \| ATTR_SIZE)) {
	ZFS_TIME_ENCODE(&vap->va_ctime, ctime);
	ZTOI(zp)->i_ctime = zpl_inode_timestamp_truncate(vap->va_ctime,
	ZTOI(zp));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	ctime, sizeof (ctime));
	}

	if (projid != ZFS_INVALID_PROJID) {
	zp->z_projid = projid;
	SA_ADD_BULK_ATTR(bulk, count,
	SA_ZPL_PROJID(zfsvfs), NULL, &zp->z_projid,
	sizeof (zp->z_projid));
	}

	if (attrzp && mask) {
	SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
	SA_ZPL_CTIME(zfsvfs), NULL, &ctime,
	sizeof (ctime));
	}

	/*
	* Do this after setting timestamps to prevent timestamp
	* update from toggling bit
	*/

	if (xoap && (mask & ATTR_XVATTR)) {

	/*
	* restore trimmed off masks
	* so that return masks can be set for caller.
	*/

	if (XVA_ISSET_REQ(tmpxvattr, XAT_APPENDONLY)) {
	XVA_SET_REQ(xvap, XAT_APPENDONLY);
	}
	if (XVA_ISSET_REQ(tmpxvattr, XAT_NOUNLINK)) {
	XVA_SET_REQ(xvap, XAT_NOUNLINK);
	}
	if (XVA_ISSET_REQ(tmpxvattr, XAT_IMMUTABLE)) {
	XVA_SET_REQ(xvap, XAT_IMMUTABLE);
	}
	if (XVA_ISSET_REQ(tmpxvattr, XAT_NODUMP)) {
	XVA_SET_REQ(xvap, XAT_NODUMP);
	}
	if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_MODIFIED)) {
	XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
	}
	if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_QUARANTINED)) {
	XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
	}
	if (XVA_ISSET_REQ(tmpxvattr, XAT_PROJINHERIT)) {
	XVA_SET_REQ(xvap, XAT_PROJINHERIT);
	}

	if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
	ASSERT(S_ISREG(ip->i_mode));

	zfs_xvattr_set(zp, xvap, tx);
	}

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	if (mask != 0)
	zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);

	mutex_exit(&zp->z_lock);
	if (mask & (ATTR_UID\|ATTR_GID\|ATTR_MODE))
	mutex_exit(&zp->z_acl_lock);

	if (attrzp) {
	if (mask & (ATTR_UID\|ATTR_GID\|ATTR_MODE))
	mutex_exit(&attrzp->z_acl_lock);
	mutex_exit(&attrzp->z_lock);
	}
	out:
	if (err == 0 && xattr_count > 0) {
	err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
	xattr_count, tx);
	ASSERT(err2 == 0);
	}

	if (aclp)
	zfs_acl_free(aclp);

	if (fuidp) {
	zfs_fuid_info_free(fuidp);
	fuidp = NULL;
	}

	if (err) {
	dmu_tx_abort(tx);
	if (attrzp)
	zrele(attrzp);
	if (err == ERESTART)
	goto top;
	} else {
	if (count > 0)
	err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
	dmu_tx_commit(tx);
	if (attrzp) {
	if (err2 == 0 && handle_eadir)
	err2 = zfs_setattr_dir(attrzp);
	zrele(attrzp);
	}
	zfs_znode_update_vfs(zp);
	}

	out2:
	if (os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	out3:
	kmem_free(xattr_bulk, sizeof (sa_bulk_attr_t) * bulks);
	kmem_free(bulk, sizeof (sa_bulk_attr_t) * bulks);
	kmem_free(tmpxvattr, sizeof (xvattr_t));
	ZFS_EXIT(zfsvfs);
	return (err);
	}

	typedef struct zfs_zlock {
	krwlock_t zl_rwlock; / lock we acquired */
	znode_t zl_znode; / znode we held */
	struct zfs_zlock zl_next; / next in list */
	} zfs_zlock_t;

	/*
	* Drop locks and release vnodes that were held by zfs_rename_lock().
	*/
	static void
	zfs_rename_unlock(zfs_zlock_t **zlpp)
	{
	zfs_zlock_t *zl;

	while ((zl = *zlpp) != NULL) {
	if (zl->zl_znode != NULL)
	zfs_zrele_async(zl->zl_znode);
	rw_exit(zl->zl_rwlock);
	*zlpp = zl->zl_next;
	kmem_free(zl, sizeof (*zl));
	}
	}

	/*
	* Search back through the directory tree, using the ".." entries.
	* Lock each directory in the chain to prevent concurrent renames.
	* Fail any attempt to move a directory into one of its own descendants.
	* XXX - z_parent_lock can overlap with map or grow locks
	*/
	static int
	zfs_rename_lock(znode_t szp, znode_t tdzp, znode_t sdzp, zfs_zlock_t *zlpp)
	{
	zfs_zlock_t *zl;
	znode_t *zp = tdzp;
	uint64_t rootid = ZTOZSB(zp)->z_root;
	uint64_t oidp = zp->z_id;
	krwlock_t *rwlp = &szp->z_parent_lock;
	krw_t rw = RW_WRITER;

	/*
	* First pass write-locks szp and compares to zp->z_id.
	* Later passes read-lock zp and compare to zp->z_parent.
	*/
	do {
	if (!rw_tryenter(rwlp, rw)) {
	/*
	* Another thread is renaming in this path.
	* Note that if we are a WRITER, we don't have any
	* parent_locks held yet.
	*/
	if (rw == RW_READER && zp->z_id > szp->z_id) {
	/*
	* Drop our locks and restart
	*/
	zfs_rename_unlock(&zl);
	*zlpp = NULL;
	zp = tdzp;
	oidp = zp->z_id;
	rwlp = &szp->z_parent_lock;
	rw = RW_WRITER;
	continue;
	} else {
	/*
	* Wait for other thread to drop its locks
	*/
	rw_enter(rwlp, rw);
	}
	}

	zl = kmem_alloc(sizeof (*zl), KM_SLEEP);
	zl->zl_rwlock = rwlp;
	zl->zl_znode = NULL;
	zl->zl_next = *zlpp;
	*zlpp = zl;

	if (oidp == szp->z_id) /* We're a descendant of szp */
	return (SET_ERROR(EINVAL));

	if (oidp == rootid) /* We've hit the top */
	return (0);

	if (rw == RW_READER) { /* i.e. not the first pass */
	int error = zfs_zget(ZTOZSB(zp), oidp, &zp);
	if (error)
	return (error);
	zl->zl_znode = zp;
	}
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(ZTOZSB(zp)),
	&oidp, sizeof (oidp));
	rwlp = &zp->z_parent_lock;
	rw = RW_READER;

	} while (zp->z_id != sdzp->z_id);

	return (0);
	}

	/*
	* Move an entry from the provided source directory to the target
	* directory. Change the entry name as indicated.
	*
	* IN: sdzp - Source directory containing the "old entry".
	* snm - Old entry name.
	* tdzp - Target directory to contain the "new entry".
	* tnm - New entry name.
	* cr - credentials of caller.
	* flags - case flags
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* sdzp,tdzp - ctime\|mtime updated
	*/
	/ARGSUSED/
	int
	zfs_rename(znode_t sdzp, char snm, znode_t tdzp, char tnm,
	cred_t *cr, int flags)
	{
	znode_t szp, tzp;
	zfsvfs_t *zfsvfs = ZTOZSB(sdzp);
	zilog_t *zilog;
	zfs_dirlock_t sdl, tdl;
	dmu_tx_t *tx;
	zfs_zlock_t *zl;
	int cmp, serr, terr;
	int error = 0;
	int zflg = 0;
	boolean_t waited = B_FALSE;

	if (snm == NULL \|\| tnm == NULL)
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(sdzp);
	zilog = zfsvfs->z_log;

	ZFS_VERIFY_ZP(tdzp);

	/*
	* We check i_sb because snapshots and the ctldir must have different
	* super blocks.
	*/
	if (ZTOI(tdzp)->i_sb != ZTOI(sdzp)->i_sb \|\|
	zfsctl_is_node(ZTOI(tdzp))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EXDEV));
	}

	if (zfsvfs->z_utf8 && u8_validate(tnm,
	strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}

	if (flags & FIGNORECASE)
	zflg \|= ZCILOOK;

	top:
	szp = NULL;
	tzp = NULL;
	zl = NULL;

	/*
	* This is to prevent the creation of links into attribute space
	* by renaming a linked file into/outof an attribute directory.
	* See the comment in zfs_link() for why this is considered bad.
	*/
	if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	/*
	* Lock source and target directory entries. To prevent deadlock,
	* a lock ordering must be defined. We lock the directory with
	* the smallest object id first, or if it's a tie, the one with
	* the lexically first name.
	*/
	if (sdzp->z_id < tdzp->z_id) {
	cmp = -1;
	} else if (sdzp->z_id > tdzp->z_id) {
	cmp = 1;
	} else {
	/*
	* First compare the two name arguments without
	* considering any case folding.
	*/
	int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER);

	cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error);
	ASSERT(error == 0 \|\| !zfsvfs->z_utf8);
	if (cmp == 0) {
	/*
	* POSIX: "If the old argument and the new argument
	* both refer to links to the same existing file,
	* the rename() function shall return successfully
	* and perform no other action."
	*/
	ZFS_EXIT(zfsvfs);
	return (0);
	}
	/*
	* If the file system is case-folding, then we may
	* have some more checking to do. A case-folding file
	* system is either supporting mixed case sensitivity
	* access or is completely case-insensitive. Note
	* that the file system is always case preserving.
	*
	* In mixed sensitivity mode case sensitive behavior
	* is the default. FIGNORECASE must be used to
	* explicitly request case insensitive behavior.
	*
	* If the source and target names provided differ only
	* by case (e.g., a request to rename 'tim' to 'Tim'),
	* we will treat this as a special case in the
	* case-insensitive mode: as long as the source name
	* is an exact match, we will allow this to proceed as
	* a name-change request.
	*/
	if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE \|\|
	(zfsvfs->z_case == ZFS_CASE_MIXED &&
	flags & FIGNORECASE)) &&
	u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST,
	&error) == 0) {
	/*
	* case preserving rename request, require exact
	* name matches
	*/
	zflg \|= ZCIEXACT;
	zflg &= ~ZCILOOK;
	}
	}

	/*
	* If the source and destination directories are the same, we should
	* grab the z_name_lock of that directory only once.
	*/
	if (sdzp == tdzp) {
	zflg \|= ZHAVELOCK;
	rw_enter(&sdzp->z_name_lock, RW_READER);
	}

	if (cmp < 0) {
	serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp,
	ZEXISTS \| zflg, NULL, NULL);
	terr = zfs_dirent_lock(&tdl,
	tdzp, tnm, &tzp, ZRENAMING \| zflg, NULL, NULL);
	} else {
	terr = zfs_dirent_lock(&tdl,
	tdzp, tnm, &tzp, zflg, NULL, NULL);
	serr = zfs_dirent_lock(&sdl,
	sdzp, snm, &szp, ZEXISTS \| ZRENAMING \| zflg,
	NULL, NULL);
	}

	if (serr) {
	/*
	* Source entry invalid or not there.
	*/
	if (!terr) {
	zfs_dirent_unlock(tdl);
	if (tzp)
	zrele(tzp);
	}

	if (sdzp == tdzp)
	rw_exit(&sdzp->z_name_lock);

	if (strcmp(snm, "..") == 0)
	serr = EINVAL;
	ZFS_EXIT(zfsvfs);
	return (serr);
	}
	if (terr) {
	zfs_dirent_unlock(sdl);
	zrele(szp);

	if (sdzp == tdzp)
	rw_exit(&sdzp->z_name_lock);

	if (strcmp(tnm, "..") == 0)
	terr = EINVAL;
	ZFS_EXIT(zfsvfs);
	return (terr);
	}

	/*
	* If we are using project inheritance, means if the directory has
	* ZFS_PROJINHERIT set, then its descendant directories will inherit
	* not only the project ID, but also the ZFS_PROJINHERIT flag. Under
	* such case, we only allow renames into our tree when the project
	* IDs are the same.
	*/
	if (tdzp->z_pflags & ZFS_PROJINHERIT &&
	tdzp->z_projid != szp->z_projid) {
	error = SET_ERROR(EXDEV);
	goto out;
	}

	/*
	* Must have write access at the source to remove the old entry
	* and write access at the target to create the new entry.
	* Note that if target and source are the same, this can be
	* done in a single check.
	*/

	if ((error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)))
	goto out;

	if (S_ISDIR(ZTOI(szp)->i_mode)) {
	/*
	* Check to make sure rename is valid.
	* Can't do a move like this: /usr/a/b to /usr/a/b/c/d
	*/
	if ((error = zfs_rename_lock(szp, tdzp, sdzp, &zl)))
	goto out;
	}

	/*
	* Does target exist?
	*/
	if (tzp) {
	/*
	* Source and target must be the same type.
	*/
	if (S_ISDIR(ZTOI(szp)->i_mode)) {
	if (!S_ISDIR(ZTOI(tzp)->i_mode)) {
	error = SET_ERROR(ENOTDIR);
	goto out;
	}
	} else {
	if (S_ISDIR(ZTOI(tzp)->i_mode)) {
	error = SET_ERROR(EISDIR);
	goto out;
	}
	}
	/*
	* POSIX dictates that when the source and target
	* entries refer to the same file object, rename
	* must do nothing and exit without error.
	*/
	if (szp->z_id == tzp->z_id) {
	error = 0;
	goto out;
	}
	}

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
	dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
	if (sdzp != tdzp) {
	dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, tdzp);
	}
	if (tzp) {
	dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, tzp);
	}

	zfs_sa_upgrade_txholds(tx, szp);
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
	error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	if (error) {
	if (zl != NULL)
	zfs_rename_unlock(&zl);
	zfs_dirent_unlock(sdl);
	zfs_dirent_unlock(tdl);

	if (sdzp == tdzp)
	rw_exit(&sdzp->z_name_lock);

	if (error == ERESTART) {
	waited = B_TRUE;
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	zrele(szp);
	if (tzp)
	zrele(tzp);
	goto top;
	}
	dmu_tx_abort(tx);
	zrele(szp);
	if (tzp)
	zrele(tzp);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if (tzp) /* Attempt to remove the existing target */
	error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);

	if (error == 0) {
	error = zfs_link_create(tdl, szp, tx, ZRENAMING);
	if (error == 0) {
	szp->z_pflags \|= ZFS_AV_MODIFIED;
	if (tdzp->z_pflags & ZFS_PROJINHERIT)
	szp->z_pflags \|= ZFS_PROJINHERIT;

	error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
	(void *)&szp->z_pflags, sizeof (uint64_t), tx);
	ASSERT0(error);

	error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
	if (error == 0) {
	zfs_log_rename(zilog, tx, TX_RENAME \|
	(flags & FIGNORECASE ? TX_CI : 0), sdzp,
	sdl->dl_name, tdzp, tdl->dl_name, szp);
	} else {
	/*
	* At this point, we have successfully created
	* the target name, but have failed to remove
	* the source name. Since the create was done
	* with the ZRENAMING flag, there are
	* complications; for one, the link count is
	* wrong. The easiest way to deal with this
	* is to remove the newly created target, and
	* return the original error. This must
	* succeed; fortunately, it is very unlikely to
	* fail, since we just created it.
	*/
	VERIFY3U(zfs_link_destroy(tdl, szp, tx,
	ZRENAMING, NULL), ==, 0);
	}
	} else {
	/*
	* If we had removed the existing target, subsequent
	* call to zfs_link_create() to add back the same entry
	* but, the new dnode (szp) should not fail.
	*/
	ASSERT(tzp == NULL);
	}
	}

	dmu_tx_commit(tx);
	out:
	if (zl != NULL)
	zfs_rename_unlock(&zl);

	zfs_dirent_unlock(sdl);
	zfs_dirent_unlock(tdl);

	zfs_znode_update_vfs(sdzp);
	if (sdzp == tdzp)
	rw_exit(&sdzp->z_name_lock);

	if (sdzp != tdzp)
	zfs_znode_update_vfs(tdzp);

	zfs_znode_update_vfs(szp);
	zrele(szp);
	if (tzp) {
	zfs_znode_update_vfs(tzp);
	zrele(tzp);
	}

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Insert the indicated symbolic reference entry into the directory.
	*
	* IN: dzp - Directory to contain new symbolic link.
	* name - Name of directory entry in dip.
	* vap - Attributes of new entry.
	* link - Name for new symlink entry.
	* cr - credentials of caller.
	* flags - case flags
	*
	* OUT: zpp - Znode for new symbolic link.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* dip - ctime\|mtime updated
	*/
	/ARGSUSED/
	int
	zfs_symlink(znode_t dzp, char name, vattr_t vap, char link,
	znode_t *zpp, cred_t cr, int flags)
	{
	znode_t *zp;
	zfs_dirlock_t *dl;
	dmu_tx_t *tx;
	zfsvfs_t *zfsvfs = ZTOZSB(dzp);
	zilog_t *zilog;
	uint64_t len = strlen(link);
	int error;
	int zflg = ZNEW;
	zfs_acl_ids_t acl_ids;
	boolean_t fuid_dirtied;
	uint64_t txtype = TX_SYMLINK;
	boolean_t waited = B_FALSE;

	ASSERT(S_ISLNK(vap->va_mode));

	if (name == NULL)
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(dzp);
	zilog = zfsvfs->z_log;

	if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
	NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}
	if (flags & FIGNORECASE)
	zflg \|= ZCILOOK;

	if (len > MAXPATHLEN) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(ENAMETOOLONG));
	}

	if ((error = zfs_acl_ids_create(dzp, 0,
	vap, cr, NULL, &acl_ids)) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	top:
	*zpp = NULL;

	/*
	* Attempt to lock directory; fail if entry already exists.
	*/
	error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL);
	if (error) {
	zfs_acl_ids_free(&acl_ids);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
	zfs_acl_ids_free(&acl_ids);
	zfs_dirent_unlock(dl);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, ZFS_DEFAULT_PROJID)) {
	zfs_acl_ids_free(&acl_ids);
	zfs_dirent_unlock(dl);
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EDQUOT));
	}
	tx = dmu_tx_create(zfsvfs->z_os);
	fuid_dirtied = zfsvfs->z_fuid_dirty;
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
	dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
	ZFS_SA_BASE_ATTR_SIZE + len);
	dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
	if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
	acl_ids.z_aclp->z_acl_bytes);
	}
	if (fuid_dirtied)
	zfs_fuid_txhold(zfsvfs, tx);
	error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	if (error) {
	zfs_dirent_unlock(dl);
	if (error == ERESTART) {
	waited = B_TRUE;
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	goto top;
	}
	zfs_acl_ids_free(&acl_ids);
	dmu_tx_abort(tx);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Create a new object for the symlink.
	* for version 4 ZPL datasets the symlink will be an SA attribute
	*/
	zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);

	if (fuid_dirtied)
	zfs_fuid_sync(zfsvfs, tx);

	mutex_enter(&zp->z_lock);
	if (zp->z_is_sa)
	error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs),
	link, len, tx);
	else
	zfs_sa_symlink(zp, link, len, tx);
	mutex_exit(&zp->z_lock);

	zp->z_size = len;
	(void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
	&zp->z_size, sizeof (zp->z_size), tx);
	/*
	* Insert the new object into the directory.
	*/
	error = zfs_link_create(dl, zp, tx, ZNEW);
	if (error != 0) {
	zfs_znode_delete(zp, tx);
	remove_inode_hash(ZTOI(zp));
	} else {
	if (flags & FIGNORECASE)
	txtype \|= TX_CI;
	zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);

	zfs_znode_update_vfs(dzp);
	zfs_znode_update_vfs(zp);
	}

	zfs_acl_ids_free(&acl_ids);

	dmu_tx_commit(tx);

	zfs_dirent_unlock(dl);

	if (error == 0) {
	*zpp = zp;

	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);
	} else {
	zrele(zp);
	}

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Return, in the buffer contained in the provided uio structure,
	* the symbolic path referred to by ip.
	*
	* IN: ip - inode of symbolic link
	* uio - structure to contain the link path.
	* cr - credentials of caller.
	*
	* RETURN: 0 if success
	* error code if failure
	*
	* Timestamps:
	* ip - atime updated
	*/
	/* ARGSUSED */
	int
	zfs_readlink(struct inode ip, zfs_uio_t uio, cred_t *cr)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	int error;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	mutex_enter(&zp->z_lock);
	if (zp->z_is_sa)
	error = sa_lookup_uio(zp->z_sa_hdl,
	SA_ZPL_SYMLINK(zfsvfs), uio);
	else
	error = zfs_sa_readlink(zp, uio);
	mutex_exit(&zp->z_lock);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/*
	* Insert a new entry into directory tdzp referencing szp.
	*
	* IN: tdzp - Directory to contain new entry.
	* szp - znode of new entry.
	* name - name of new entry.
	* cr - credentials of caller.
	* flags - case flags.
	*
	* RETURN: 0 if success
	* error code if failure
	*
	* Timestamps:
	* tdzp - ctime\|mtime updated
	* szp - ctime updated
	*/
	/* ARGSUSED */
	int
	zfs_link(znode_t tdzp, znode_t szp, char name, cred_t cr,
	int flags)
	{
	struct inode *sip = ZTOI(szp);
	znode_t *tzp;
	zfsvfs_t *zfsvfs = ZTOZSB(tdzp);
	zilog_t *zilog;
	zfs_dirlock_t *dl;
	dmu_tx_t *tx;
	int error;
	int zf = ZNEW;
	uint64_t parent;
	uid_t owner;
	boolean_t waited = B_FALSE;
	boolean_t is_tmpfile = 0;
	uint64_t txg;
	#ifdef HAVE_TMPFILE
	is_tmpfile = (sip->i_nlink == 0 && (sip->i_state & I_LINKABLE));
	#endif
	ASSERT(S_ISDIR(ZTOI(tdzp)->i_mode));

	if (name == NULL)
	return (SET_ERROR(EINVAL));

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(tdzp);
	zilog = zfsvfs->z_log;

	/*
	* POSIX dictates that we return EPERM here.
	* Better choices include ENOTSUP or EISDIR.
	*/
	if (S_ISDIR(sip->i_mode)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	ZFS_VERIFY_ZP(szp);

	/*
	* If we are using project inheritance, means if the directory has
	* ZFS_PROJINHERIT set, then its descendant directories will inherit
	* not only the project ID, but also the ZFS_PROJINHERIT flag. Under
	* such case, we only allow hard link creation in our tree when the
	* project IDs are the same.
	*/
	if (tdzp->z_pflags & ZFS_PROJINHERIT &&
	tdzp->z_projid != szp->z_projid) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EXDEV));
	}

	/*
	* We check i_sb because snapshots and the ctldir must have different
	* super blocks.
	*/
	if (sip->i_sb != ZTOI(tdzp)->i_sb \|\| zfsctl_is_node(sip)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EXDEV));
	}

	/* Prevent links to .zfs/shares files */

	if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
	&parent, sizeof (uint64_t))) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	if (parent == zfsvfs->z_shares_dir) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	if (zfsvfs->z_utf8 && u8_validate(name,
	strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EILSEQ));
	}
	if (flags & FIGNORECASE)
	zf \|= ZCILOOK;

	/*
	* We do not support links between attributes and non-attributes
	* because of the potential security risk of creating links
	* into "normal" file space in order to circumvent restrictions
	* imposed in attribute space.
	*/
	if ((szp->z_pflags & ZFS_XATTR) != (tdzp->z_pflags & ZFS_XATTR)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	owner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(sip->i_uid),
	cr, ZFS_OWNER);
	if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	if ((error = zfs_zaccess(tdzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	top:
	/*
	* Attempt to lock directory; fail if entry already exists.
	*/
	error = zfs_dirent_lock(&dl, tdzp, name, &tzp, zf, NULL, NULL);
	if (error) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
	dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, name);
	if (is_tmpfile)
	dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);

	zfs_sa_upgrade_txholds(tx, szp);
	zfs_sa_upgrade_txholds(tx, tdzp);
	error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) \| TXG_NOWAIT);
	if (error) {
	zfs_dirent_unlock(dl);
	if (error == ERESTART) {
	waited = B_TRUE;
	dmu_tx_wait(tx);
	dmu_tx_abort(tx);
	goto top;
	}
	dmu_tx_abort(tx);
	ZFS_EXIT(zfsvfs);
	return (error);
	}
	/* unmark z_unlinked so zfs_link_create will not reject */
	if (is_tmpfile)
	szp->z_unlinked = B_FALSE;
	error = zfs_link_create(dl, szp, tx, 0);

	if (error == 0) {
	uint64_t txtype = TX_LINK;
	/*
	* tmpfile is created to be in z_unlinkedobj, so remove it.
	* Also, we don't log in ZIL, because all previous file
	* operation on the tmpfile are ignored by ZIL. Instead we
	* always wait for txg to sync to make sure all previous
	* operation are sync safe.
	*/
	if (is_tmpfile) {
	VERIFY(zap_remove_int(zfsvfs->z_os,
	zfsvfs->z_unlinkedobj, szp->z_id, tx) == 0);
	} else {
	if (flags & FIGNORECASE)
	txtype \|= TX_CI;
	zfs_log_link(zilog, tx, txtype, tdzp, szp, name);
	}
	} else if (is_tmpfile) {
	/* restore z_unlinked since when linking failed */
	szp->z_unlinked = B_TRUE;
	}
	txg = dmu_tx_get_txg(tx);
	dmu_tx_commit(tx);

	zfs_dirent_unlock(dl);

	if (!is_tmpfile && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	zil_commit(zilog, 0);

	if (is_tmpfile && zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED)
	txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), txg);

	zfs_znode_update_vfs(tdzp);
	zfs_znode_update_vfs(szp);
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	static void
	zfs_putpage_commit_cb(void *arg)
	{
	struct page *pp = arg;

	ClearPageError(pp);
	end_page_writeback(pp);
	}

	/*
	* Push a page out to disk, once the page is on stable storage the
	* registered commit callback will be run as notification of completion.
	*
	* IN: ip - page mapped for inode.
	* pp - page to push (page is locked)
	* wbc - writeback control data
	*
	* RETURN: 0 if success
	* error code if failure
	*
	* Timestamps:
	* ip - ctime\|mtime updated
	*/
	/* ARGSUSED */
	int
	zfs_putpage(struct inode ip, struct page pp, struct writeback_control *wbc)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	loff_t offset;
	loff_t pgoff;
	unsigned int pglen;
	dmu_tx_t *tx;
	caddr_t va;
	int err = 0;
	uint64_t mtime[2], ctime[2];
	sa_bulk_attr_t bulk[3];
	int cnt = 0;
	struct address_space *mapping;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	ASSERT(PageLocked(pp));

	pgoff = page_offset(pp); /* Page byte-offset in file */
	offset = i_size_read(ip); /* File length in bytes */
	pglen = MIN(PAGE_SIZE, /* Page length in bytes */
	P2ROUNDUP(offset, PAGE_SIZE)-pgoff);

	/* Page is beyond end of file */
	if (pgoff >= offset) {
	unlock_page(pp);
	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/* Truncate page length to end of file */
	if (pgoff + pglen > offset)
	pglen = offset - pgoff;

	#if 0
	/*
	* FIXME: Allow mmap writes past its quota. The correct fix
	* is to register a page_mkwrite() handler to count the page
	* against its quota when it is about to be dirtied.
	*/
	if (zfs_id_overblockquota(zfsvfs, DMU_USERUSED_OBJECT,
	KUID_TO_SUID(ip->i_uid)) \|\|
	zfs_id_overblockquota(zfsvfs, DMU_GROUPUSED_OBJECT,
	KGID_TO_SGID(ip->i_gid)) \|\|
	(zp->z_projid != ZFS_DEFAULT_PROJID &&
	zfs_id_overblockquota(zfsvfs, DMU_PROJECTUSED_OBJECT,
	zp->z_projid))) {
	err = EDQUOT;
	}
	#endif

	/*
	* The ordering here is critical and must adhere to the following
	* rules in order to avoid deadlocking in either zfs_read() or
	* zfs_free_range() due to a lock inversion.
	*
	* 1) The page must be unlocked prior to acquiring the range lock.
	* This is critical because zfs_read() calls find_lock_page()
	* which may block on the page lock while holding the range lock.
	*
	* 2) Before setting or clearing write back on a page the range lock
	* must be held in order to prevent a lock inversion with the
	* zfs_free_range() function.
	*
	* This presents a problem because upon entering this function the
	* page lock is already held. To safely acquire the range lock the
	* page lock must be dropped. This creates a window where another
	* process could truncate, invalidate, dirty, or write out the page.
	*
	* Therefore, after successfully reacquiring the range and page locks
	* the current page state is checked. In the common case everything
	* will be as is expected and it can be written out. However, if
	* the page state has changed it must be handled accordingly.
	*/
	mapping = pp->mapping;
	redirty_page_for_writepage(wbc, pp);
	unlock_page(pp);

	zfs_locked_range_t *lr = zfs_rangelock_enter(&zp->z_rangelock,
	pgoff, pglen, RL_WRITER);
	lock_page(pp);

	/* Page mapping changed or it was no longer dirty, we're done */
	if (unlikely((mapping != pp->mapping) \|\| !PageDirty(pp))) {
	unlock_page(pp);
	zfs_rangelock_exit(lr);
	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/* Another process started write block if required */
	if (PageWriteback(pp)) {
	unlock_page(pp);
	zfs_rangelock_exit(lr);

	if (wbc->sync_mode != WB_SYNC_NONE) {
	if (PageWriteback(pp))
	wait_on_page_bit(pp, PG_writeback);
	}

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/* Clear the dirty flag the required locks are held */
	if (!clear_page_dirty_for_io(pp)) {
	unlock_page(pp);
	zfs_rangelock_exit(lr);
	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/*
	* Counterpart for redirty_page_for_writepage() above. This page
	* was in fact not skipped and should not be counted as if it were.
	*/
	wbc->pages_skipped--;
	set_page_writeback(pp);
	unlock_page(pp);

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_write(tx, zp->z_id, pgoff, pglen);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);

	err = dmu_tx_assign(tx, TXG_NOWAIT);
	if (err != 0) {
	if (err == ERESTART)
	dmu_tx_wait(tx);

	dmu_tx_abort(tx);
	__set_page_dirty_nobuffers(pp);
	ClearPageError(pp);
	end_page_writeback(pp);
	zfs_rangelock_exit(lr);
	ZFS_EXIT(zfsvfs);
	return (err);
	}

	va = kmap(pp);
	ASSERT3U(pglen, <=, PAGE_SIZE);
	dmu_write(zfsvfs->z_os, zp->z_id, pgoff, pglen, va, tx);
	kunmap(pp);

	SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
	SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
	SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, 8);

	/* Preserve the mtime and ctime provided by the inode */
	ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
	ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
	zp->z_atime_dirty = B_FALSE;
	zp->z_seq++;

	err = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);

	zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, pgoff, pglen, 0,
	zfs_putpage_commit_cb, pp);
	dmu_tx_commit(tx);

	zfs_rangelock_exit(lr);

	if (wbc->sync_mode != WB_SYNC_NONE) {
	/*
	* Note that this is rarely called under writepages(), because
	* writepages() normally handles the entire commit for
	* performance reasons.
	*/
	zil_commit(zfsvfs->z_log, zp->z_id);
	}

	ZFS_EXIT(zfsvfs);
	return (err);
	}

	/*
	* Update the system attributes when the inode has been dirtied. For the
	* moment we only update the mode, atime, mtime, and ctime.
	*/
	int
	zfs_dirty_inode(struct inode *ip, int flags)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	dmu_tx_t *tx;
	uint64_t mode, atime[2], mtime[2], ctime[2];
	sa_bulk_attr_t bulk[4];
	int error = 0;
	int cnt = 0;

	if (zfs_is_readonly(zfsvfs) \|\| dmu_objset_is_snapshot(zfsvfs->z_os))
	return (0);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	#ifdef I_DIRTY_TIME
	/*
	* This is the lazytime semantic introduced in Linux 4.0
	* This flag will only be called from update_time when lazytime is set.
	* (Note, I_DIRTY_SYNC will also set if not lazytime)
	* Fortunately mtime and ctime are managed within ZFS itself, so we
	* only need to dirty atime.
	*/
	if (flags == I_DIRTY_TIME) {
	zp->z_atime_dirty = B_TRUE;
	goto out;
	}
	#endif

	tx = dmu_tx_create(zfsvfs->z_os);

	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);

	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	goto out;
	}

	mutex_enter(&zp->z_lock);
	zp->z_atime_dirty = B_FALSE;

	SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
	SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
	SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
	SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);

	/* Preserve the mode, mtime and ctime provided by the inode */
	ZFS_TIME_ENCODE(&ip->i_atime, atime);
	ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
	ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
	mode = ip->i_mode;

	zp->z_mode = mode;

	error = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
	mutex_exit(&zp->z_lock);

	dmu_tx_commit(tx);
	out:
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/ARGSUSED/
	void
	zfs_inactive(struct inode *ip)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	uint64_t atime[2];
	int error;
	int need_unlock = 0;

	/* Only read lock if we haven't already write locked, e.g. rollback */
	if (!RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)) {
	need_unlock = 1;
	rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
	}
	if (zp->z_sa_hdl == NULL) {
	if (need_unlock)
	rw_exit(&zfsvfs->z_teardown_inactive_lock);
	return;
	}

	if (zp->z_atime_dirty && zp->z_unlinked == B_FALSE) {
	dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);

	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	} else {
	ZFS_TIME_ENCODE(&ip->i_atime, atime);
	mutex_enter(&zp->z_lock);
	(void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
	(void *)&atime, sizeof (atime), tx);
	zp->z_atime_dirty = B_FALSE;
	mutex_exit(&zp->z_lock);
	dmu_tx_commit(tx);
	}
	}

	zfs_zinactive(zp);
	if (need_unlock)
	rw_exit(&zfsvfs->z_teardown_inactive_lock);
	}

	/*
	* Fill pages with data from the disk.
	*/
	static int
	zfs_fillpage(struct inode ip, struct page pl[], int nr_pages)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	objset_t *os;
	struct page *cur_pp;
	u_offset_t io_off, total;
	size_t io_len;
	loff_t i_size;
	unsigned page_idx;
	int err;

	os = zfsvfs->z_os;
	io_len = nr_pages << PAGE_SHIFT;
	i_size = i_size_read(ip);
	io_off = page_offset(pl[0]);

	if (io_off + io_len > i_size)
	io_len = i_size - io_off;

	/*
	* Iterate over list of pages and read each page individually.
	*/
	page_idx = 0;
	for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
	caddr_t va;

	cur_pp = pl[page_idx++];
	va = kmap(cur_pp);
	err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
	DMU_READ_PREFETCH);
	kunmap(cur_pp);
	if (err) {
	/* convert checksum errors into IO errors */
	if (err == ECKSUM)
	err = SET_ERROR(EIO);
	return (err);
	}
	}

	return (0);
	}

	/*
	* Uses zfs_fillpage to read data from the file and fill the pages.
	*
	* IN: ip - inode of file to get data from.
	* pl - list of pages to read
	* nr_pages - number of pages to read
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* vp - atime updated
	*/
	/* ARGSUSED */
	int
	zfs_getpage(struct inode ip, struct page pl[], int nr_pages)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	int err;

	if (pl == NULL)
	return (0);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	err = zfs_fillpage(ip, pl, nr_pages);

	ZFS_EXIT(zfsvfs);
	return (err);
	}

	/*
	* Check ZFS specific permissions to memory map a section of a file.
	*
	* IN: ip - inode of the file to mmap
	* off - file offset
	* addrp - start address in memory region
	* len - length of memory region
	* vm_flags- address flags
	*
	* RETURN: 0 if success
	* error code if failure
	*/
	/ARGSUSED/
	int
	zfs_map(struct inode ip, offset_t off, caddr_t addrp, size_t len,
	unsigned long vm_flags)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	if ((vm_flags & VM_WRITE) && (zp->z_pflags &
	(ZFS_IMMUTABLE \| ZFS_READONLY \| ZFS_APPENDONLY))) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EPERM));
	}

	if ((vm_flags & (VM_READ \| VM_EXEC)) &&
	(zp->z_pflags & ZFS_AV_QUARANTINED)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EACCES));
	}

	if (off < 0 \|\| len > MAXOFFSET_T - off) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(ENXIO));
	}

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	/*
	* Free or allocate space in a file. Currently, this function only
	* supports the `F_FREESP' command. However, this command is somewhat
	* misnamed, as its functionality includes the ability to allocate as
	* well as free space.
	*
	* IN: zp - znode of file to free data in.
	* cmd - action to take (only F_FREESP supported).
	* bfp - section of file to free/alloc.
	* flag - current file open mode flags.
	* offset - current file offset.
	* cr - credentials of caller.
	*
	* RETURN: 0 on success, error code on failure.
	*
	* Timestamps:
	* zp - ctime\|mtime updated
	*/
	/* ARGSUSED */
	int
	zfs_space(znode_t zp, int cmd, flock64_t bfp, int flag,
	offset_t offset, cred_t *cr)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	uint64_t off, len;
	int error;

	ZFS_ENTER(zfsvfs);
	ZFS_VERIFY_ZP(zp);

	if (cmd != F_FREESP) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	/*
	* Callers might not be able to detect properly that we are read-only,
	* so check it explicitly here.
	*/
	if (zfs_is_readonly(zfsvfs)) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EROFS));
	}

	if (bfp->l_len < 0) {
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(EINVAL));
	}

	/*
	* Permissions aren't checked on Solaris because on this OS
	* zfs_space() can only be called with an opened file handle.
	* On Linux we can get here through truncate_range() which
	* operates directly on inodes, so we need to check access rights.
	*/
	if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr))) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	off = bfp->l_start;
	len = bfp->l_len; /* 0 means from off to end of file */

	error = zfs_freesp(zp, off, len, flag, TRUE);

	ZFS_EXIT(zfsvfs);
	return (error);
	}

	/ARGSUSED/
	int
	zfs_fid(struct inode ip, fid_t fidp)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ITOZSB(ip);
	uint32_t gen;
	uint64_t gen64;
	uint64_t object = zp->z_id;
	zfid_short_t *zfid;
	int size, i, error;

	ZFS_ENTER(zfsvfs);

	if (fidp->fid_len < SHORT_FID_LEN) {
	fidp->fid_len = SHORT_FID_LEN;
	ZFS_EXIT(zfsvfs);
	return (SET_ERROR(ENOSPC));
	}

	ZFS_VERIFY_ZP(zp);

	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs),
	&gen64, sizeof (uint64_t))) != 0) {
	ZFS_EXIT(zfsvfs);
	return (error);
	}

	gen = (uint32_t)gen64;

	size = SHORT_FID_LEN;

	zfid = (zfid_short_t *)fidp;

	zfid->zf_len = size;

	for (i = 0; i < sizeof (zfid->zf_object); i++)
	zfid->zf_object[i] = (uint8_t)(object >> (8 * i));

	/* Must have a non-zero generation number to distinguish from .zfs */
	if (gen == 0)
	gen = 1;
	for (i = 0; i < sizeof (zfid->zf_gen); i++)
	zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));

	ZFS_EXIT(zfsvfs);
	return (0);
	}

	#if defined(_KERNEL)
	EXPORT_SYMBOL(zfs_open);
	EXPORT_SYMBOL(zfs_close);
	EXPORT_SYMBOL(zfs_lookup);
	EXPORT_SYMBOL(zfs_create);
	EXPORT_SYMBOL(zfs_tmpfile);
	EXPORT_SYMBOL(zfs_remove);
	EXPORT_SYMBOL(zfs_mkdir);
	EXPORT_SYMBOL(zfs_rmdir);
	EXPORT_SYMBOL(zfs_readdir);
	EXPORT_SYMBOL(zfs_getattr_fast);
	EXPORT_SYMBOL(zfs_setattr);
	EXPORT_SYMBOL(zfs_rename);
	EXPORT_SYMBOL(zfs_symlink);
	EXPORT_SYMBOL(zfs_readlink);
	EXPORT_SYMBOL(zfs_link);
	EXPORT_SYMBOL(zfs_inactive);
	EXPORT_SYMBOL(zfs_space);
	EXPORT_SYMBOL(zfs_fid);
	EXPORT_SYMBOL(zfs_getpage);
	EXPORT_SYMBOL(zfs_putpage);
	EXPORT_SYMBOL(zfs_dirty_inode);
	EXPORT_SYMBOL(zfs_map);

	/* BEGIN CSTYLED */
	module_param(zfs_delete_blocks, ulong, 0644);
	MODULE_PARM_DESC(zfs_delete_blocks, "Delete files larger than N blocks async");
	/* END CSTYLED */

	#endif
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/zfs_znode.c b/sys/contrib/openzfs/module/os/linux/zfs/zfs_znode.c
	index 3c6d68fc6b35..c841cc0fc8b5 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/zfs_znode.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/zfs_znode.c
	@@ -1,2251 +1,2255 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	*/

	/* Portions Copyright 2007 Jeremy Teo */

	#ifdef _KERNEL
	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/sysmacros.h>
	#include <sys/mntent.h>
	#include <sys/u8_textprep.h>
	#include <sys/dsl_dataset.h>
	#include <sys/vfs.h>
	#include <sys/vnode.h>
	#include <sys/file.h>
	#include <sys/kmem.h>
	#include <sys/errno.h>
	#include <sys/atomic.h>
	#include <sys/zfs_dir.h>
	#include <sys/zfs_acl.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zfs_rlock.h>
	#include <sys/zfs_fuid.h>
	#include <sys/zfs_vnops.h>
	#include <sys/zfs_ctldir.h>
	#include <sys/dnode.h>
	#include <sys/fs/zfs.h>
	#include <sys/zpl.h>
	#endif /* _KERNEL */

	#include <sys/dmu.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_tx.h>
	#include <sys/zfs_refcount.h>
	#include <sys/stat.h>
	#include <sys/zap.h>
	#include <sys/zfs_znode.h>
	#include <sys/sa.h>
	#include <sys/zfs_sa.h>
	#include <sys/zfs_stat.h>

	#include "zfs_prop.h"
	#include "zfs_comutil.h"

	/*
	* Functions needed for userland (ie: libzpool) are not put under
	* #ifdef_KERNEL; the rest of the functions have dependencies
	* (such as VFS logic) that will not compile easily in userland.
	*/
	#ifdef _KERNEL

	static kmem_cache_t *znode_cache = NULL;
	static kmem_cache_t *znode_hold_cache = NULL;
	unsigned int zfs_object_mutex_size = ZFS_OBJ_MTX_SZ;

	/*
	* This is used by the test suite so that it can delay znodes from being
	* freed in order to inspect the unlinked set.
	*/
	int zfs_unlink_suspend_progress = 0;

	/*
	* This callback is invoked when acquiring a RL_WRITER or RL_APPEND lock on
	* z_rangelock. It will modify the offset and length of the lock to reflect
	* znode-specific information, and convert RL_APPEND to RL_WRITER. This is
	* called with the rangelock_t's rl_lock held, which avoids races.
	*/
	static void
	zfs_rangelock_cb(zfs_locked_range_t new, void arg)
	{
	znode_t *zp = arg;

	/*
	* If in append mode, convert to writer and lock starting at the
	* current end of file.
	*/
	if (new->lr_type == RL_APPEND) {
	new->lr_offset = zp->z_size;
	new->lr_type = RL_WRITER;
	}

	/*
	* If we need to grow the block size then lock the whole file range.
	*/
	uint64_t end_size = MAX(zp->z_size, new->lr_offset + new->lr_length);
	if (end_size > zp->z_blksz && (!ISP2(zp->z_blksz) \|\|
	zp->z_blksz < ZTOZSB(zp)->z_max_blksz)) {
	new->lr_offset = 0;
	new->lr_length = UINT64_MAX;
	}
	}

	/ARGSUSED/
	static int
	zfs_znode_cache_constructor(void buf, void arg, int kmflags)
	{
	znode_t *zp = buf;

	inode_init_once(ZTOI(zp));
	list_link_init(&zp->z_link_node);

	mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
	rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
	rw_init(&zp->z_name_lock, NULL, RW_NOLOCKDEP, NULL);
	mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
	rw_init(&zp->z_xattr_lock, NULL, RW_DEFAULT, NULL);

	zfs_rangelock_init(&zp->z_rangelock, zfs_rangelock_cb, zp);

	zp->z_dirlocks = NULL;
	zp->z_acl_cached = NULL;
	zp->z_xattr_cached = NULL;
	zp->z_xattr_parent = 0;
	return (0);
	}

	/ARGSUSED/
	static void
	zfs_znode_cache_destructor(void buf, void arg)
	{
	znode_t *zp = buf;

	ASSERT(!list_link_active(&zp->z_link_node));
	mutex_destroy(&zp->z_lock);
	rw_destroy(&zp->z_parent_lock);
	rw_destroy(&zp->z_name_lock);
	mutex_destroy(&zp->z_acl_lock);
	rw_destroy(&zp->z_xattr_lock);
	zfs_rangelock_fini(&zp->z_rangelock);

	ASSERT(zp->z_dirlocks == NULL);
	ASSERT(zp->z_acl_cached == NULL);
	ASSERT(zp->z_xattr_cached == NULL);
	}

	static int
	zfs_znode_hold_cache_constructor(void buf, void arg, int kmflags)
	{
	znode_hold_t *zh = buf;

	mutex_init(&zh->zh_lock, NULL, MUTEX_DEFAULT, NULL);
	zfs_refcount_create(&zh->zh_refcount);
	zh->zh_obj = ZFS_NO_OBJECT;

	return (0);
	}

	static void
	zfs_znode_hold_cache_destructor(void buf, void arg)
	{
	znode_hold_t *zh = buf;

	mutex_destroy(&zh->zh_lock);
	zfs_refcount_destroy(&zh->zh_refcount);
	}

	void
	zfs_znode_init(void)
	{
	/*
	* Initialize zcache. The KMC_SLAB hint is used in order that it be
	* backed by kmalloc() when on the Linux slab in order that any
	* wait_on_bit() operations on the related inode operate properly.
	*/
	ASSERT(znode_cache == NULL);
	znode_cache = kmem_cache_create("zfs_znode_cache",
	sizeof (znode_t), 0, zfs_znode_cache_constructor,
	zfs_znode_cache_destructor, NULL, NULL, NULL, KMC_SLAB);

	ASSERT(znode_hold_cache == NULL);
	znode_hold_cache = kmem_cache_create("zfs_znode_hold_cache",
	sizeof (znode_hold_t), 0, zfs_znode_hold_cache_constructor,
	zfs_znode_hold_cache_destructor, NULL, NULL, NULL, 0);
	}

	void
	zfs_znode_fini(void)
	{
	/*
	* Cleanup zcache
	*/
	if (znode_cache)
	kmem_cache_destroy(znode_cache);
	znode_cache = NULL;

	if (znode_hold_cache)
	kmem_cache_destroy(znode_hold_cache);
	znode_hold_cache = NULL;
	}

	/*
	* The zfs_znode_hold_enter() / zfs_znode_hold_exit() functions are used to
	* serialize access to a znode and its SA buffer while the object is being
	* created or destroyed. This kind of locking would normally reside in the
	* znode itself but in this case that's impossible because the znode and SA
	* buffer may not yet exist. Therefore the locking is handled externally
	* with an array of mutexes and AVLs trees which contain per-object locks.
	*
	* In zfs_znode_hold_enter() a per-object lock is created as needed, inserted
	* in to the correct AVL tree and finally the per-object lock is held. In
	* zfs_znode_hold_exit() the process is reversed. The per-object lock is
	* released, removed from the AVL tree and destroyed if there are no waiters.
	*
	* This scheme has two important properties:
	*
	* 1) No memory allocations are performed while holding one of the z_hold_locks.
	* This ensures evict(), which can be called from direct memory reclaim, will
	* never block waiting on a z_hold_locks which just happens to have hashed
	* to the same index.
	*
	* 2) All locks used to serialize access to an object are per-object and never
	* shared. This minimizes lock contention without creating a large number
	* of dedicated locks.
	*
	* On the downside it does require znode_lock_t structures to be frequently
	* allocated and freed. However, because these are backed by a kmem cache
	* and very short lived this cost is minimal.
	*/
	int
	zfs_znode_hold_compare(const void a, const void b)
	{
	const znode_hold_t zh_a = (const znode_hold_t )a;
	const znode_hold_t zh_b = (const znode_hold_t )b;

	return (TREE_CMP(zh_a->zh_obj, zh_b->zh_obj));
	}

	static boolean_t __maybe_unused
	zfs_znode_held(zfsvfs_t *zfsvfs, uint64_t obj)
	{
	znode_hold_t *zh, search;
	int i = ZFS_OBJ_HASH(zfsvfs, obj);
	boolean_t held;

	search.zh_obj = obj;

	mutex_enter(&zfsvfs->z_hold_locks[i]);
	zh = avl_find(&zfsvfs->z_hold_trees[i], &search, NULL);
	held = (zh && MUTEX_HELD(&zh->zh_lock)) ? B_TRUE : B_FALSE;
	mutex_exit(&zfsvfs->z_hold_locks[i]);

	return (held);
	}

	static znode_hold_t *
	zfs_znode_hold_enter(zfsvfs_t *zfsvfs, uint64_t obj)
	{
	znode_hold_t zh, zh_new, search;
	int i = ZFS_OBJ_HASH(zfsvfs, obj);
	boolean_t found = B_FALSE;

	zh_new = kmem_cache_alloc(znode_hold_cache, KM_SLEEP);
	zh_new->zh_obj = obj;
	search.zh_obj = obj;

	mutex_enter(&zfsvfs->z_hold_locks[i]);
	zh = avl_find(&zfsvfs->z_hold_trees[i], &search, NULL);
	if (likely(zh == NULL)) {
	zh = zh_new;
	avl_add(&zfsvfs->z_hold_trees[i], zh);
	} else {
	ASSERT3U(zh->zh_obj, ==, obj);
	found = B_TRUE;
	}
	zfs_refcount_add(&zh->zh_refcount, NULL);
	mutex_exit(&zfsvfs->z_hold_locks[i]);

	if (found == B_TRUE)
	kmem_cache_free(znode_hold_cache, zh_new);

	ASSERT(MUTEX_NOT_HELD(&zh->zh_lock));
	ASSERT3S(zfs_refcount_count(&zh->zh_refcount), >, 0);
	mutex_enter(&zh->zh_lock);

	return (zh);
	}

	static void
	zfs_znode_hold_exit(zfsvfs_t zfsvfs, znode_hold_t zh)
	{
	int i = ZFS_OBJ_HASH(zfsvfs, zh->zh_obj);
	boolean_t remove = B_FALSE;

	ASSERT(zfs_znode_held(zfsvfs, zh->zh_obj));
	ASSERT3S(zfs_refcount_count(&zh->zh_refcount), >, 0);
	mutex_exit(&zh->zh_lock);

	mutex_enter(&zfsvfs->z_hold_locks[i]);
	if (zfs_refcount_remove(&zh->zh_refcount, NULL) == 0) {
	avl_remove(&zfsvfs->z_hold_trees[i], zh);
	remove = B_TRUE;
	}
	mutex_exit(&zfsvfs->z_hold_locks[i]);

	if (remove == B_TRUE)
	kmem_cache_free(znode_hold_cache, zh);
	}

	dev_t
	zfs_cmpldev(uint64_t dev)
	{
	return (dev);
	}

	static void
	zfs_znode_sa_init(zfsvfs_t zfsvfs, znode_t zp,
	dmu_buf_t db, dmu_object_type_t obj_type, sa_handle_t sa_hdl)
	{
	ASSERT(zfs_znode_held(zfsvfs, zp->z_id));

	mutex_enter(&zp->z_lock);

	ASSERT(zp->z_sa_hdl == NULL);
	ASSERT(zp->z_acl_cached == NULL);
	if (sa_hdl == NULL) {
	VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp,
	SA_HDL_SHARED, &zp->z_sa_hdl));
	} else {
	zp->z_sa_hdl = sa_hdl;
	sa_set_userp(sa_hdl, zp);
	}

	zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;

	mutex_exit(&zp->z_lock);
	}

	void
	zfs_znode_dmu_fini(znode_t *zp)
	{
	ASSERT(zfs_znode_held(ZTOZSB(zp), zp->z_id) \|\| zp->z_unlinked \|\|
	RW_WRITE_HELD(&ZTOZSB(zp)->z_teardown_inactive_lock));

	sa_handle_destroy(zp->z_sa_hdl);
	zp->z_sa_hdl = NULL;
	}

	/*
	* Called by new_inode() to allocate a new inode.
	*/
	int
	zfs_inode_alloc(struct super_block sb, struct inode *ip)
	{
	znode_t *zp;

	zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
	*ip = ZTOI(zp);

	return (0);
	}

	/*
	* Called in multiple places when an inode should be destroyed.
	*/
	void
	zfs_inode_destroy(struct inode *ip)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ZTOZSB(zp);

	mutex_enter(&zfsvfs->z_znodes_lock);
	if (list_link_active(&zp->z_link_node)) {
	list_remove(&zfsvfs->z_all_znodes, zp);
	zfsvfs->z_nr_znodes--;
	}
	mutex_exit(&zfsvfs->z_znodes_lock);

	if (zp->z_acl_cached) {
	zfs_acl_free(zp->z_acl_cached);
	zp->z_acl_cached = NULL;
	}

	if (zp->z_xattr_cached) {
	nvlist_free(zp->z_xattr_cached);
	zp->z_xattr_cached = NULL;
	}

	kmem_cache_free(znode_cache, zp);
	}

	static void
	zfs_inode_set_ops(zfsvfs_t zfsvfs, struct inode ip)
	{
	uint64_t rdev = 0;

	switch (ip->i_mode & S_IFMT) {
	case S_IFREG:
	ip->i_op = &zpl_inode_operations;
	ip->i_fop = &zpl_file_operations;
	ip->i_mapping->a_ops = &zpl_address_space_operations;
	break;

	case S_IFDIR:
	ip->i_op = &zpl_dir_inode_operations;
	ip->i_fop = &zpl_dir_file_operations;
	ITOZ(ip)->z_zn_prefetch = B_TRUE;
	break;

	case S_IFLNK:
	ip->i_op = &zpl_symlink_inode_operations;
	break;

	/*
	* rdev is only stored in a SA only for device files.
	*/
	case S_IFCHR:
	case S_IFBLK:
	(void) sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), &rdev,
	sizeof (rdev));
	/FALLTHROUGH/
	case S_IFIFO:
	case S_IFSOCK:
	init_special_inode(ip, ip->i_mode, rdev);
	ip->i_op = &zpl_special_inode_operations;
	break;

	default:
	zfs_panic_recover("inode %llu has invalid mode: 0x%x\n",
	(u_longlong_t)ip->i_ino, ip->i_mode);

	/* Assume the inode is a file and attempt to continue */
	ip->i_mode = S_IFREG \| 0644;
	ip->i_op = &zpl_inode_operations;
	ip->i_fop = &zpl_file_operations;
	ip->i_mapping->a_ops = &zpl_address_space_operations;
	break;
	}
	}

	static void
	zfs_set_inode_flags(znode_t zp, struct inode ip)
	{
	/*
	* Linux and Solaris have different sets of file attributes, so we
	* restrict this conversion to the intersection of the two.
	*/
	#ifdef HAVE_INODE_SET_FLAGS
	unsigned int flags = 0;
	if (zp->z_pflags & ZFS_IMMUTABLE)
	flags \|= S_IMMUTABLE;
	if (zp->z_pflags & ZFS_APPENDONLY)
	flags \|= S_APPEND;

	inode_set_flags(ip, flags, S_IMMUTABLE\|S_APPEND);
	#else
	if (zp->z_pflags & ZFS_IMMUTABLE)
	ip->i_flags \|= S_IMMUTABLE;
	else
	ip->i_flags &= ~S_IMMUTABLE;

	if (zp->z_pflags & ZFS_APPENDONLY)
	ip->i_flags \|= S_APPEND;
	else
	ip->i_flags &= ~S_APPEND;
	#endif
	}

	/*
	* Update the embedded inode given the znode.
	*/
	void
	zfs_znode_update_vfs(znode_t *zp)
	{
	zfsvfs_t *zfsvfs;
	struct inode *ip;
	uint32_t blksize;
	u_longlong_t i_blocks;

	ASSERT(zp != NULL);
	zfsvfs = ZTOZSB(zp);
	ip = ZTOI(zp);

	/* Skip .zfs control nodes which do not exist on disk. */
	if (zfsctl_is_node(ip))
	return;

	dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &blksize, &i_blocks);

	spin_lock(&ip->i_lock);
	ip->i_mode = zp->z_mode;
	ip->i_blocks = i_blocks;
	i_size_write(ip, zp->z_size);
	spin_unlock(&ip->i_lock);
	}


	/*
	* Construct a znode+inode and initialize.
	*
	* This does not do a call to dmu_set_user() that is
	* up to the caller to do, in case you don't want to
	* return the znode
	*/
	static znode_t *
	zfs_znode_alloc(zfsvfs_t zfsvfs, dmu_buf_t db, int blksz,
	dmu_object_type_t obj_type, sa_handle_t *hdl)
	{
	znode_t *zp;
	struct inode *ip;
	uint64_t mode;
	uint64_t parent;
	uint64_t tmp_gen;
	uint64_t links;
	uint64_t z_uid, z_gid;
	- uint64_t atime[2], mtime[2], ctime[2];
	+ uint64_t atime[2], mtime[2], ctime[2], btime[2];
	uint64_t projid = ZFS_DEFAULT_PROJID;
	- sa_bulk_attr_t bulk[11];
	+ sa_bulk_attr_t bulk[12];
	int count = 0;

	ASSERT(zfsvfs != NULL);

	ip = new_inode(zfsvfs->z_sb);
	if (ip == NULL)
	return (NULL);

	zp = ITOZ(ip);
	ASSERT(zp->z_dirlocks == NULL);
	ASSERT3P(zp->z_acl_cached, ==, NULL);
	ASSERT3P(zp->z_xattr_cached, ==, NULL);
	zp->z_unlinked = B_FALSE;
	zp->z_atime_dirty = B_FALSE;
	zp->z_is_mapped = B_FALSE;
	zp->z_is_ctldir = B_FALSE;
	zp->z_is_stale = B_FALSE;
	zp->z_suspended = B_FALSE;
	zp->z_sa_hdl = NULL;
	zp->z_mapcnt = 0;
	zp->z_id = db->db_object;
	zp->z_blksz = blksz;
	zp->z_seq = 0x7A4653;
	zp->z_sync_cnt = 0;

	zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &tmp_gen, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
	&zp->z_size, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL,
	&parent, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, &z_uid, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, &z_gid, 8);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
	+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &btime, 16);

	if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 \|\| tmp_gen == 0 \|\|
	(dmu_objset_projectquota_enabled(zfsvfs->z_os) &&
	(zp->z_pflags & ZFS_PROJID) &&
	sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs), &projid, 8) != 0)) {
	if (hdl == NULL)
	sa_handle_destroy(zp->z_sa_hdl);
	zp->z_sa_hdl = NULL;
	goto error;
	}

	zp->z_projid = projid;
	zp->z_mode = ip->i_mode = mode;
	ip->i_generation = (uint32_t)tmp_gen;
	ip->i_blkbits = SPA_MINBLOCKSHIFT;
	set_nlink(ip, (uint32_t)links);
	zfs_uid_write(ip, z_uid);
	zfs_gid_write(ip, z_gid);
	zfs_set_inode_flags(zp, ip);

	/* Cache the xattr parent id */
	if (zp->z_pflags & ZFS_XATTR)
	zp->z_xattr_parent = parent;

	ZFS_TIME_DECODE(&ip->i_atime, atime);
	ZFS_TIME_DECODE(&ip->i_mtime, mtime);
	ZFS_TIME_DECODE(&ip->i_ctime, ctime);
	+ ZFS_TIME_DECODE(&zp->z_btime, btime);

	ip->i_ino = zp->z_id;
	zfs_znode_update_vfs(zp);
	zfs_inode_set_ops(zfsvfs, ip);

	/*
	* The only way insert_inode_locked() can fail is if the ip->i_ino
	* number is already hashed for this super block. This can never
	* happen because the inode numbers map 1:1 with the object numbers.
	*
	* Exceptions include rolling back a mounted file system, either
	* from the zfs rollback or zfs recv command.
	*
	* Active inodes are unhashed during the rollback, but since zrele
	* can happen asynchronously, we can't guarantee they've been
	* unhashed. This can cause hash collisions in unlinked drain
	* processing so do not hash unlinked znodes.
	*/
	if (links > 0)
	VERIFY3S(insert_inode_locked(ip), ==, 0);

	mutex_enter(&zfsvfs->z_znodes_lock);
	list_insert_tail(&zfsvfs->z_all_znodes, zp);
	zfsvfs->z_nr_znodes++;
	mutex_exit(&zfsvfs->z_znodes_lock);

	if (links > 0)
	unlock_new_inode(ip);
	return (zp);

	error:
	iput(ip);
	return (NULL);
	}

	/*
	* Safely mark an inode dirty. Inodes which are part of a read-only
	* file system or snapshot may not be dirtied.
	*/
	void
	zfs_mark_inode_dirty(struct inode *ip)
	{
	zfsvfs_t *zfsvfs = ITOZSB(ip);

	if (zfs_is_readonly(zfsvfs) \|\| dmu_objset_is_snapshot(zfsvfs->z_os))
	return;

	mark_inode_dirty(ip);
	}

	static uint64_t empty_xattr;
	static uint64_t pad[4];
	static zfs_acl_phys_t acl_phys;
	/*
	* Create a new DMU object to hold a zfs znode.
	*
	* IN: dzp - parent directory for new znode
	* vap - file attributes for new znode
	* tx - dmu transaction id for zap operations
	* cr - credentials of caller
	* flag - flags:
	* IS_ROOT_NODE - new object will be root
	* IS_TMPFILE - new object is of O_TMPFILE
	* IS_XATTR - new object is an attribute
	* acl_ids - ACL related attributes
	*
	* OUT: zpp - allocated znode (set to dzp if IS_ROOT_NODE)
	*
	*/
	void
	zfs_mknode(znode_t dzp, vattr_t vap, dmu_tx_t tx, cred_t cr,
	uint_t flag, znode_t *zpp, zfs_acl_ids_t acl_ids)
	{
	uint64_t crtime[2], atime[2], mtime[2], ctime[2];
	uint64_t mode, size, links, parent, pflags;
	uint64_t projid = ZFS_DEFAULT_PROJID;
	uint64_t rdev = 0;
	zfsvfs_t *zfsvfs = ZTOZSB(dzp);
	dmu_buf_t *db;
	inode_timespec_t now;
	uint64_t gen, obj;
	int bonuslen;
	int dnodesize;
	sa_handle_t *sa_hdl;
	dmu_object_type_t obj_type;
	sa_bulk_attr_t *sa_attrs;
	int cnt = 0;
	zfs_acl_locator_cb_t locate = { 0 };
	znode_hold_t *zh;

	if (zfsvfs->z_replay) {
	obj = vap->va_nodeid;
	now = vap->va_ctime; /* see zfs_replay_create() */
	gen = vap->va_nblocks; /* ditto */
	dnodesize = vap->va_fsid; /* ditto */
	} else {
	obj = 0;
	gethrestime(&now);
	gen = dmu_tx_get_txg(tx);
	dnodesize = dmu_objset_dnodesize(zfsvfs->z_os);
	}

	if (dnodesize == 0)
	dnodesize = DNODE_MIN_SIZE;

	obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;

	bonuslen = (obj_type == DMU_OT_SA) ?
	DN_BONUS_SIZE(dnodesize) : ZFS_OLD_ZNODE_PHYS_SIZE;

	/*
	* Create a new DMU object.
	*/
	/*
	* There's currently no mechanism for pre-reading the blocks that will
	* be needed to allocate a new object, so we accept the small chance
	* that there will be an i/o error and we will fail one of the
	* assertions below.
	*/
	if (S_ISDIR(vap->va_mode)) {
	if (zfsvfs->z_replay) {
	VERIFY0(zap_create_claim_norm_dnsize(zfsvfs->z_os, obj,
	zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
	obj_type, bonuslen, dnodesize, tx));
	} else {
	obj = zap_create_norm_dnsize(zfsvfs->z_os,
	zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
	obj_type, bonuslen, dnodesize, tx);
	}
	} else {
	if (zfsvfs->z_replay) {
	VERIFY0(dmu_object_claim_dnsize(zfsvfs->z_os, obj,
	DMU_OT_PLAIN_FILE_CONTENTS, 0,
	obj_type, bonuslen, dnodesize, tx));
	} else {
	obj = dmu_object_alloc_dnsize(zfsvfs->z_os,
	DMU_OT_PLAIN_FILE_CONTENTS, 0,
	obj_type, bonuslen, dnodesize, tx);
	}
	}

	zh = zfs_znode_hold_enter(zfsvfs, obj);
	VERIFY0(sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));

	/*
	* If this is the root, fix up the half-initialized parent pointer
	* to reference the just-allocated physical data area.
	*/
	if (flag & IS_ROOT_NODE) {
	dzp->z_id = obj;
	}

	/*
	* If parent is an xattr, so am I.
	*/
	if (dzp->z_pflags & ZFS_XATTR) {
	flag \|= IS_XATTR;
	}

	if (zfsvfs->z_use_fuids)
	pflags = ZFS_ARCHIVE \| ZFS_AV_MODIFIED;
	else
	pflags = 0;

	if (S_ISDIR(vap->va_mode)) {
	size = 2; /* contents ("." and "..") */
	links = 2;
	} else {
	size = 0;
	links = (flag & IS_TMPFILE) ? 0 : 1;
	}

	if (S_ISBLK(vap->va_mode) \|\| S_ISCHR(vap->va_mode))
	rdev = vap->va_rdev;

	parent = dzp->z_id;
	mode = acl_ids->z_mode;
	if (flag & IS_XATTR)
	pflags \|= ZFS_XATTR;

	if (S_ISREG(vap->va_mode) \|\| S_ISDIR(vap->va_mode)) {
	/*
	* With ZFS_PROJID flag, we can easily know whether there is
	* project ID stored on disk or not. See zfs_space_delta_cb().
	*/
	if (obj_type != DMU_OT_ZNODE &&
	dmu_objset_projectquota_enabled(zfsvfs->z_os))
	pflags \|= ZFS_PROJID;

	/*
	* Inherit project ID from parent if required.
	*/
	projid = zfs_inherit_projid(dzp);
	if (dzp->z_pflags & ZFS_PROJINHERIT)
	pflags \|= ZFS_PROJINHERIT;
	}

	/*
	* No execs denied will be determined when zfs_mode_compute() is called.
	*/
	pflags \|= acl_ids->z_aclp->z_hints &
	(ZFS_ACL_TRIVIAL\|ZFS_INHERIT_ACE\|ZFS_ACL_AUTO_INHERIT\|
	ZFS_ACL_DEFAULTED\|ZFS_ACL_PROTECTED);

	ZFS_TIME_ENCODE(&now, crtime);
	ZFS_TIME_ENCODE(&now, ctime);

	if (vap->va_mask & ATTR_ATIME) {
	ZFS_TIME_ENCODE(&vap->va_atime, atime);
	} else {
	ZFS_TIME_ENCODE(&now, atime);
	}

	if (vap->va_mask & ATTR_MTIME) {
	ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
	} else {
	ZFS_TIME_ENCODE(&now, mtime);
	}

	/* Now add in all of the "SA" attributes */
	VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
	&sa_hdl));

	/*
	* Setup the array of attributes to be replaced/set on the new file
	*
	* order for DMU_OT_ZNODE is critical since it needs to be constructed
	* in the old znode_phys_t format. Don't change this ordering
	*/
	sa_attrs = kmem_alloc(sizeof (sa_bulk_attr_t) * ZPL_END, KM_SLEEP);

	if (obj_type == DMU_OT_ZNODE) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
	NULL, &atime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
	NULL, &mtime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
	NULL, &ctime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
	NULL, &crtime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
	NULL, &gen, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
	NULL, &mode, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
	NULL, &size, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
	NULL, &parent, 8);
	} else {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
	NULL, &mode, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
	NULL, &size, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
	NULL, &gen, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs),
	NULL, &acl_ids->z_fuid, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs),
	NULL, &acl_ids->z_fgid, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
	NULL, &parent, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
	NULL, &pflags, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
	NULL, &atime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
	NULL, &mtime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
	NULL, &ctime, 16);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
	NULL, &crtime, 16);
	}

	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);

	if (obj_type == DMU_OT_ZNODE) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL,
	&empty_xattr, 8);
	} else if (dmu_objset_projectquota_enabled(zfsvfs->z_os) &&
	pflags & ZFS_PROJID) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PROJID(zfsvfs),
	NULL, &projid, 8);
	}
	if (obj_type == DMU_OT_ZNODE \|\|
	(S_ISBLK(vap->va_mode) \|\| S_ISCHR(vap->va_mode))) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs),
	NULL, &rdev, 8);
	}
	if (obj_type == DMU_OT_ZNODE) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
	NULL, &pflags, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
	&acl_ids->z_fuid, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
	&acl_ids->z_fgid, 8);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad,
	sizeof (uint64_t) * 4);
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
	&acl_phys, sizeof (zfs_acl_phys_t));
	} else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
	&acl_ids->z_aclp->z_acl_count, 8);
	locate.cb_aclp = acl_ids->z_aclp;
	SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs),
	zfs_acl_data_locator, &locate,
	acl_ids->z_aclp->z_acl_bytes);
	mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
	acl_ids->z_fuid, acl_ids->z_fgid);
	}

	VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);

	if (!(flag & IS_ROOT_NODE)) {
	/*
	* The call to zfs_znode_alloc() may fail if memory is low
	* via the call path: alloc_inode() -> inode_init_always() ->
	* security_inode_alloc() -> inode_alloc_security(). Since
	* the existing code is written such that zfs_mknode() can
	* not fail retry until sufficient memory has been reclaimed.
	*/
	do {
	*zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
	} while (*zpp == NULL);

	VERIFY(*zpp != NULL);
	VERIFY(dzp != NULL);
	} else {
	/*
	* If we are creating the root node, the "parent" we
	* passed in is the znode for the root.
	*/
	*zpp = dzp;

	(*zpp)->z_sa_hdl = sa_hdl;
	}

	(*zpp)->z_pflags = pflags;
	(zpp)->z_mode = ZTOI(zpp)->i_mode = mode;
	(*zpp)->z_dnodesize = dnodesize;
	(*zpp)->z_projid = projid;

	if (obj_type == DMU_OT_ZNODE \|\|
	acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
	VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
	}
	kmem_free(sa_attrs, sizeof (sa_bulk_attr_t) * ZPL_END);
	zfs_znode_hold_exit(zfsvfs, zh);
	}

	/*
	* Update in-core attributes. It is assumed the caller will be doing an
	* sa_bulk_update to push the changes out.
	*/
	void
	zfs_xvattr_set(znode_t zp, xvattr_t xvap, dmu_tx_t *tx)
	{
	xoptattr_t *xoap;
	boolean_t update_inode = B_FALSE;

	xoap = xva_getxoptattr(xvap);
	ASSERT(xoap);

	if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
	uint64_t times[2];
	ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
	(void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
	&times, sizeof (times), tx);
	XVA_SET_RTN(xvap, XAT_CREATETIME);
	}
	if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
	ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_READONLY);
	}
	if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
	ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_HIDDEN);
	}
	if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
	ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_SYSTEM);
	}
	if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
	ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_ARCHIVE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
	ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_IMMUTABLE);

	update_inode = B_TRUE;
	}
	if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
	ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_NOUNLINK);
	}
	if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
	ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_APPENDONLY);

	update_inode = B_TRUE;
	}
	if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
	ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_NODUMP);
	}
	if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
	ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_OPAQUE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
	ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
	xoap->xoa_av_quarantined, zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
	}
	if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
	ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
	}
	if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
	zfs_sa_set_scanstamp(zp, xvap, tx);
	XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
	}
	if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
	ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_REPARSE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
	ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_OFFLINE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
	ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_SPARSE);
	}
	if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
	ZFS_ATTR_SET(zp, ZFS_PROJINHERIT, xoap->xoa_projinherit,
	zp->z_pflags, tx);
	XVA_SET_RTN(xvap, XAT_PROJINHERIT);
	}

	if (update_inode)
	zfs_set_inode_flags(zp, ZTOI(zp));
	}

	int
	zfs_zget(zfsvfs_t zfsvfs, uint64_t obj_num, znode_t *zpp)
	{
	dmu_object_info_t doi;
	dmu_buf_t *db;
	znode_t *zp;
	znode_hold_t *zh;
	int err;
	sa_handle_t *hdl;

	*zpp = NULL;

	again:
	zh = zfs_znode_hold_enter(zfsvfs, obj_num);

	err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
	if (err) {
	zfs_znode_hold_exit(zfsvfs, zh);
	return (err);
	}

	dmu_object_info_from_db(db, &doi);
	if (doi.doi_bonus_type != DMU_OT_SA &&
	(doi.doi_bonus_type != DMU_OT_ZNODE \|\|
	(doi.doi_bonus_type == DMU_OT_ZNODE &&
	doi.doi_bonus_size < sizeof (znode_phys_t)))) {
	sa_buf_rele(db, NULL);
	zfs_znode_hold_exit(zfsvfs, zh);
	return (SET_ERROR(EINVAL));
	}

	hdl = dmu_buf_get_user(db);
	if (hdl != NULL) {
	zp = sa_get_userdata(hdl);


	/*
	* Since "SA" does immediate eviction we
	* should never find a sa handle that doesn't
	* know about the znode.
	*/

	ASSERT3P(zp, !=, NULL);

	mutex_enter(&zp->z_lock);
	ASSERT3U(zp->z_id, ==, obj_num);
	/*
	* If zp->z_unlinked is set, the znode is already marked
	* for deletion and should not be discovered. Check this
	* after checking igrab() due to fsetxattr() & O_TMPFILE.
	*
	* If igrab() returns NULL the VFS has independently
	* determined the inode should be evicted and has
	* called iput_final() to start the eviction process.
	* The SA handle is still valid but because the VFS
	* requires that the eviction succeed we must drop
	* our locks and references to allow the eviction to
	* complete. The zfs_zget() may then be retried.
	*
	* This unlikely case could be optimized by registering
	* a sops->drop_inode() callback. The callback would
	* need to detect the active SA hold thereby informing
	* the VFS that this inode should not be evicted.
	*/
	if (igrab(ZTOI(zp)) == NULL) {
	if (zp->z_unlinked)
	err = SET_ERROR(ENOENT);
	else
	err = SET_ERROR(EAGAIN);
	} else {
	*zpp = zp;
	err = 0;
	}

	mutex_exit(&zp->z_lock);
	sa_buf_rele(db, NULL);
	zfs_znode_hold_exit(zfsvfs, zh);

	if (err == EAGAIN) {
	/* inode might need this to finish evict */
	cond_resched();
	goto again;
	}
	return (err);
	}

	/*
	* Not found create new znode/vnode but only if file exists.
	*
	* There is a small window where zfs_vget() could
	* find this object while a file create is still in
	* progress. This is checked for in zfs_znode_alloc()
	*
	* if zfs_znode_alloc() fails it will drop the hold on the
	* bonus buffer.
	*/
	zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size,
	doi.doi_bonus_type, NULL);
	if (zp == NULL) {
	err = SET_ERROR(ENOENT);
	} else {
	*zpp = zp;
	}
	zfs_znode_hold_exit(zfsvfs, zh);
	return (err);
	}

	int
	zfs_rezget(znode_t *zp)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	dmu_object_info_t doi;
	dmu_buf_t *db;
	uint64_t obj_num = zp->z_id;
	uint64_t mode;
	uint64_t links;
	- sa_bulk_attr_t bulk[10];
	+ sa_bulk_attr_t bulk[11];
	int err;
	int count = 0;
	uint64_t gen;
	uint64_t z_uid, z_gid;
	- uint64_t atime[2], mtime[2], ctime[2];
	+ uint64_t atime[2], mtime[2], ctime[2], btime[2];
	uint64_t projid = ZFS_DEFAULT_PROJID;
	znode_hold_t *zh;

	/*
	* skip ctldir, otherwise they will always get invalidated. This will
	* cause funny behaviour for the mounted snapdirs. Especially for
	* Linux >= 3.18, d_invalidate will detach the mountpoint and prevent
	* anyone automount it again as long as someone is still using the
	* detached mount.
	*/
	if (zp->z_is_ctldir)
	return (0);

	zh = zfs_znode_hold_enter(zfsvfs, obj_num);

	mutex_enter(&zp->z_acl_lock);
	if (zp->z_acl_cached) {
	zfs_acl_free(zp->z_acl_cached);
	zp->z_acl_cached = NULL;
	}
	mutex_exit(&zp->z_acl_lock);

	rw_enter(&zp->z_xattr_lock, RW_WRITER);
	if (zp->z_xattr_cached) {
	nvlist_free(zp->z_xattr_cached);
	zp->z_xattr_cached = NULL;
	}
	rw_exit(&zp->z_xattr_lock);

	ASSERT(zp->z_sa_hdl == NULL);
	err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
	if (err) {
	zfs_znode_hold_exit(zfsvfs, zh);
	return (err);
	}

	dmu_object_info_from_db(db, &doi);
	if (doi.doi_bonus_type != DMU_OT_SA &&
	(doi.doi_bonus_type != DMU_OT_ZNODE \|\|
	(doi.doi_bonus_type == DMU_OT_ZNODE &&
	doi.doi_bonus_size < sizeof (znode_phys_t)))) {
	sa_buf_rele(db, NULL);
	zfs_znode_hold_exit(zfsvfs, zh);
	return (SET_ERROR(EINVAL));
	}

	zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);

	/* reload cached values */
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
	&gen, sizeof (gen));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
	&zp->z_size, sizeof (zp->z_size));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
	&links, sizeof (links));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
	&zp->z_pflags, sizeof (zp->z_pflags));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
	&z_uid, sizeof (z_uid));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
	&z_gid, sizeof (z_gid));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
	&mode, sizeof (mode));
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
	&atime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
	&mtime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
	&ctime, 16);
	+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &btime, 16);

	if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
	zfs_znode_dmu_fini(zp);
	zfs_znode_hold_exit(zfsvfs, zh);
	return (SET_ERROR(EIO));
	}

	if (dmu_objset_projectquota_enabled(zfsvfs->z_os)) {
	err = sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs),
	&projid, 8);
	if (err != 0 && err != ENOENT) {
	zfs_znode_dmu_fini(zp);
	zfs_znode_hold_exit(zfsvfs, zh);
	return (SET_ERROR(err));
	}
	}

	zp->z_projid = projid;
	zp->z_mode = ZTOI(zp)->i_mode = mode;
	zfs_uid_write(ZTOI(zp), z_uid);
	zfs_gid_write(ZTOI(zp), z_gid);

	ZFS_TIME_DECODE(&ZTOI(zp)->i_atime, atime);
	ZFS_TIME_DECODE(&ZTOI(zp)->i_mtime, mtime);
	ZFS_TIME_DECODE(&ZTOI(zp)->i_ctime, ctime);
	+ ZFS_TIME_DECODE(&zp->z_btime, btime);

	if ((uint32_t)gen != ZTOI(zp)->i_generation) {
	zfs_znode_dmu_fini(zp);
	zfs_znode_hold_exit(zfsvfs, zh);
	return (SET_ERROR(EIO));
	}

	set_nlink(ZTOI(zp), (uint32_t)links);
	zfs_set_inode_flags(zp, ZTOI(zp));

	zp->z_blksz = doi.doi_data_block_size;
	zp->z_atime_dirty = B_FALSE;
	zfs_znode_update_vfs(zp);

	/*
	* If the file has zero links, then it has been unlinked on the send
	* side and it must be in the received unlinked set.
	* We call zfs_znode_dmu_fini() now to prevent any accesses to the
	* stale data and to prevent automatic removal of the file in
	* zfs_zinactive(). The file will be removed either when it is removed
	* on the send side and the next incremental stream is received or
	* when the unlinked set gets processed.
	*/
	zp->z_unlinked = (ZTOI(zp)->i_nlink == 0);
	if (zp->z_unlinked)
	zfs_znode_dmu_fini(zp);

	zfs_znode_hold_exit(zfsvfs, zh);

	return (0);
	}

	void
	zfs_znode_delete(znode_t zp, dmu_tx_t tx)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	objset_t *os = zfsvfs->z_os;
	uint64_t obj = zp->z_id;
	uint64_t acl_obj = zfs_external_acl(zp);
	znode_hold_t *zh;

	zh = zfs_znode_hold_enter(zfsvfs, obj);
	if (acl_obj) {
	VERIFY(!zp->z_is_sa);
	VERIFY(0 == dmu_object_free(os, acl_obj, tx));
	}
	VERIFY(0 == dmu_object_free(os, obj, tx));
	zfs_znode_dmu_fini(zp);
	zfs_znode_hold_exit(zfsvfs, zh);
	}

	void
	zfs_zinactive(znode_t *zp)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	uint64_t z_id = zp->z_id;
	znode_hold_t *zh;

	ASSERT(zp->z_sa_hdl);

	/*
	* Don't allow a zfs_zget() while were trying to release this znode.
	*/
	zh = zfs_znode_hold_enter(zfsvfs, z_id);

	mutex_enter(&zp->z_lock);

	/*
	* If this was the last reference to a file with no links, remove
	* the file from the file system unless the file system is mounted
	* read-only. That can happen, for example, if the file system was
	* originally read-write, the file was opened, then unlinked and
	* the file system was made read-only before the file was finally
	* closed. The file will remain in the unlinked set.
	*/
	if (zp->z_unlinked) {
	ASSERT(!zfsvfs->z_issnap);
	if (!zfs_is_readonly(zfsvfs) && !zfs_unlink_suspend_progress) {
	mutex_exit(&zp->z_lock);
	zfs_znode_hold_exit(zfsvfs, zh);
	zfs_rmnode(zp);
	return;
	}
	}

	mutex_exit(&zp->z_lock);
	zfs_znode_dmu_fini(zp);

	zfs_znode_hold_exit(zfsvfs, zh);
	}

	#if defined(HAVE_INODE_TIMESPEC64_TIMES)
	#define zfs_compare_timespec timespec64_compare
	#else
	#define zfs_compare_timespec timespec_compare
	#endif

	/*
	* Determine whether the znode's atime must be updated. The logic mostly
	* duplicates the Linux kernel's relatime_need_update() functionality.
	* This function is only called if the underlying filesystem actually has
	* atime updates enabled.
	*/
	boolean_t
	zfs_relatime_need_update(const struct inode *ip)
	{
	inode_timespec_t now;

	gethrestime(&now);
	/*
	* In relatime mode, only update the atime if the previous atime
	* is earlier than either the ctime or mtime or if at least a day
	* has passed since the last update of atime.
	*/
	if (zfs_compare_timespec(&ip->i_mtime, &ip->i_atime) >= 0)
	return (B_TRUE);

	if (zfs_compare_timespec(&ip->i_ctime, &ip->i_atime) >= 0)
	return (B_TRUE);

	if ((hrtime_t)now.tv_sec - (hrtime_t)ip->i_atime.tv_sec >= 246060)
	return (B_TRUE);

	return (B_FALSE);
	}

	/*
	* Prepare to update znode time stamps.
	*
	* IN: zp - znode requiring timestamp update
	* flag - ATTR_MTIME, ATTR_CTIME flags
	*
	* OUT: zp - z_seq
	* mtime - new mtime
	* ctime - new ctime
	*
	* Note: We don't update atime here, because we rely on Linux VFS to do
	* atime updating.
	*/
	void
	zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
	uint64_t ctime[2])
	{
	inode_timespec_t now;

	gethrestime(&now);

	zp->z_seq++;

	if (flag & ATTR_MTIME) {
	ZFS_TIME_ENCODE(&now, mtime);
	ZFS_TIME_DECODE(&(ZTOI(zp)->i_mtime), mtime);
	if (ZTOZSB(zp)->z_use_fuids) {
	zp->z_pflags \|= (ZFS_ARCHIVE \|
	ZFS_AV_MODIFIED);
	}
	}

	if (flag & ATTR_CTIME) {
	ZFS_TIME_ENCODE(&now, ctime);
	ZFS_TIME_DECODE(&(ZTOI(zp)->i_ctime), ctime);
	if (ZTOZSB(zp)->z_use_fuids)
	zp->z_pflags \|= ZFS_ARCHIVE;
	}
	}

	/*
	* Grow the block size for a file.
	*
	* IN: zp - znode of file to free data in.
	* size - requested block size
	* tx - open transaction.
	*
	* NOTE: this function assumes that the znode is write locked.
	*/
	void
	zfs_grow_blocksize(znode_t zp, uint64_t size, dmu_tx_t tx)
	{
	int error;
	u_longlong_t dummy;

	if (size <= zp->z_blksz)
	return;
	/*
	* If the file size is already greater than the current blocksize,
	* we will not grow. If there is more than one block in a file,
	* the blocksize cannot change.
	*/
	if (zp->z_blksz && zp->z_size > zp->z_blksz)
	return;

	error = dmu_object_set_blocksize(ZTOZSB(zp)->z_os, zp->z_id,
	size, 0, tx);

	if (error == ENOTSUP)
	return;
	ASSERT0(error);

	/* What blocksize did we actually get? */
	dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
	}

	/*
	* Increase the file length
	*
	* IN: zp - znode of file to free data in.
	* end - new end-of-file
	*
	* RETURN: 0 on success, error code on failure
	*/
	static int
	zfs_extend(znode_t *zp, uint64_t end)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	dmu_tx_t *tx;
	zfs_locked_range_t *lr;
	uint64_t newblksz;
	int error;

	/*
	* We will change zp_size, lock the whole file.
	*/
	lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);

	/*
	* Nothing to do if file already at desired length.
	*/
	if (end <= zp->z_size) {
	zfs_rangelock_exit(lr);
	return (0);
	}
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	if (end > zp->z_blksz &&
	(!ISP2(zp->z_blksz) \|\| zp->z_blksz < zfsvfs->z_max_blksz)) {
	/*
	* We are growing the file past the current block size.
	*/
	if (zp->z_blksz > ZTOZSB(zp)->z_max_blksz) {
	/*
	* File's blocksize is already larger than the
	* "recordsize" property. Only let it grow to
	* the next power of 2.
	*/
	ASSERT(!ISP2(zp->z_blksz));
	newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
	} else {
	newblksz = MIN(end, ZTOZSB(zp)->z_max_blksz);
	}
	dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
	} else {
	newblksz = 0;
	}

	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	zfs_rangelock_exit(lr);
	return (error);
	}

	if (newblksz)
	zfs_grow_blocksize(zp, newblksz, tx);

	zp->z_size = end;

	VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(ZTOZSB(zp)),
	&zp->z_size, sizeof (zp->z_size), tx));

	zfs_rangelock_exit(lr);

	dmu_tx_commit(tx);

	return (0);
	}

	/*
	* zfs_zero_partial_page - Modeled after update_pages() but
	* with different arguments and semantics for use by zfs_freesp().
	*
	* Zeroes a piece of a single page cache entry for zp at offset
	* start and length len.
	*
	* Caller must acquire a range lock on the file for the region
	* being zeroed in order that the ARC and page cache stay in sync.
	*/
	static void
	zfs_zero_partial_page(znode_t *zp, uint64_t start, uint64_t len)
	{
	struct address_space *mp = ZTOI(zp)->i_mapping;
	struct page *pp;
	int64_t off;
	void *pb;

	ASSERT((start & PAGE_MASK) == ((start + len - 1) & PAGE_MASK));

	off = start & (PAGE_SIZE - 1);
	start &= PAGE_MASK;

	pp = find_lock_page(mp, start >> PAGE_SHIFT);
	if (pp) {
	if (mapping_writably_mapped(mp))
	flush_dcache_page(pp);

	pb = kmap(pp);
	bzero(pb + off, len);
	kunmap(pp);

	if (mapping_writably_mapped(mp))
	flush_dcache_page(pp);

	mark_page_accessed(pp);
	SetPageUptodate(pp);
	ClearPageError(pp);
	unlock_page(pp);
	put_page(pp);
	}
	}

	/*
	* Free space in a file.
	*
	* IN: zp - znode of file to free data in.
	* off - start of section to free.
	* len - length of section to free.
	*
	* RETURN: 0 on success, error code on failure
	*/
	static int
	zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	zfs_locked_range_t *lr;
	int error;

	/*
	* Lock the range being freed.
	*/
	lr = zfs_rangelock_enter(&zp->z_rangelock, off, len, RL_WRITER);

	/*
	* Nothing to do if file already at desired length.
	*/
	if (off >= zp->z_size) {
	zfs_rangelock_exit(lr);
	return (0);
	}

	if (off + len > zp->z_size)
	len = zp->z_size - off;

	error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);

	/*
	* Zero partial page cache entries. This must be done under a
	* range lock in order to keep the ARC and page cache in sync.
	*/
	if (zp->z_is_mapped) {
	loff_t first_page, last_page, page_len;
	loff_t first_page_offset, last_page_offset;

	/* first possible full page in hole */
	first_page = (off + PAGE_SIZE - 1) >> PAGE_SHIFT;
	/* last page of hole */
	last_page = (off + len) >> PAGE_SHIFT;

	/* offset of first_page */
	first_page_offset = first_page << PAGE_SHIFT;
	/* offset of last_page */
	last_page_offset = last_page << PAGE_SHIFT;

	/* truncate whole pages */
	if (last_page_offset > first_page_offset) {
	truncate_inode_pages_range(ZTOI(zp)->i_mapping,
	first_page_offset, last_page_offset - 1);
	}

	/* truncate sub-page ranges */
	if (first_page > last_page) {
	/* entire punched area within a single page */
	zfs_zero_partial_page(zp, off, len);
	} else {
	/* beginning of punched area at the end of a page */
	page_len = first_page_offset - off;
	if (page_len > 0)
	zfs_zero_partial_page(zp, off, page_len);

	/* end of punched area at the beginning of a page */
	page_len = off + len - last_page_offset;
	if (page_len > 0)
	zfs_zero_partial_page(zp, last_page_offset,
	page_len);
	}
	}
	zfs_rangelock_exit(lr);

	return (error);
	}

	/*
	* Truncate a file
	*
	* IN: zp - znode of file to free data in.
	* end - new end-of-file.
	*
	* RETURN: 0 on success, error code on failure
	*/
	static int
	zfs_trunc(znode_t *zp, uint64_t end)
	{
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	dmu_tx_t *tx;
	zfs_locked_range_t *lr;
	int error;
	sa_bulk_attr_t bulk[2];
	int count = 0;

	/*
	* We will change zp_size, lock the whole file.
	*/
	lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);

	/*
	* Nothing to do if file already at desired length.
	*/
	if (end >= zp->z_size) {
	zfs_rangelock_exit(lr);
	return (0);
	}

	error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end,
	DMU_OBJECT_END);
	if (error) {
	zfs_rangelock_exit(lr);
	return (error);
	}
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	dmu_tx_mark_netfree(tx);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	zfs_rangelock_exit(lr);
	return (error);
	}

	zp->z_size = end;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
	NULL, &zp->z_size, sizeof (zp->z_size));

	if (end == 0) {
	zp->z_pflags &= ~ZFS_SPARSE;
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
	NULL, &zp->z_pflags, 8);
	}
	VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);

	dmu_tx_commit(tx);
	zfs_rangelock_exit(lr);

	return (0);
	}

	/*
	* Free space in a file
	*
	* IN: zp - znode of file to free data in.
	* off - start of range
	* len - end of range (0 => EOF)
	* flag - current file open mode flags.
	* log - TRUE if this action should be logged
	*
	* RETURN: 0 on success, error code on failure
	*/
	int
	zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
	{
	dmu_tx_t *tx;
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	zilog_t *zilog = zfsvfs->z_log;
	uint64_t mode;
	uint64_t mtime[2], ctime[2];
	sa_bulk_attr_t bulk[3];
	int count = 0;
	int error;

	if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
	sizeof (mode))) != 0)
	return (error);

	if (off > zp->z_size) {
	error = zfs_extend(zp, off+len);
	if (error == 0 && log)
	goto log;
	goto out;
	}

	if (len == 0) {
	error = zfs_trunc(zp, off);
	} else {
	if ((error = zfs_free_range(zp, off, len)) == 0 &&
	off + len > zp->z_size)
	error = zfs_extend(zp, off+len);
	}
	if (error \|\| !log)
	goto out;
	log:
	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
	zfs_sa_upgrade_txholds(tx, zp);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	goto out;
	}

	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
	SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
	NULL, &zp->z_pflags, 8);
	zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
	error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
	ASSERT(error == 0);

	zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);

	dmu_tx_commit(tx);

	zfs_znode_update_vfs(zp);
	error = 0;

	out:
	/*
	* Truncate the page cache - for file truncate operations, use
	* the purpose-built API for truncations. For punching operations,
	* the truncation is handled under a range lock in zfs_free_range.
	*/
	if (len == 0)
	truncate_setsize(ZTOI(zp), off);
	return (error);
	}

	void
	zfs_create_fs(objset_t os, cred_t cr, nvlist_t zplprops, dmu_tx_t tx)
	{
	struct super_block *sb;
	zfsvfs_t *zfsvfs;
	uint64_t moid, obj, sa_obj, version;
	uint64_t sense = ZFS_CASE_SENSITIVE;
	uint64_t norm = 0;
	nvpair_t *elem;
	int size;
	int error;
	int i;
	znode_t *rootzp = NULL;
	vattr_t vattr;
	znode_t *zp;
	zfs_acl_ids_t acl_ids;

	/*
	* First attempt to create master node.
	*/
	/*
	* In an empty objset, there are no blocks to read and thus
	* there can be no i/o errors (which we assert below).
	*/
	moid = MASTER_NODE_OBJ;
	error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
	DMU_OT_NONE, 0, tx);
	ASSERT(error == 0);

	/*
	* Set starting attributes.
	*/
	version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
	elem = NULL;
	while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
	/* For the moment we expect all zpl props to be uint64_ts */
	uint64_t val;
	char *name;

	ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
	VERIFY(nvpair_value_uint64(elem, &val) == 0);
	name = nvpair_name(elem);
	if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
	if (val < version)
	version = val;
	} else {
	error = zap_update(os, moid, name, 8, 1, &val, tx);
	}
	ASSERT(error == 0);
	if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
	norm = val;
	else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
	sense = val;
	}
	ASSERT(version != 0);
	error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);

	/*
	* Create zap object used for SA attribute registration
	*/

	if (version >= ZPL_VERSION_SA) {
	sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
	DMU_OT_NONE, 0, tx);
	error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
	ASSERT(error == 0);
	} else {
	sa_obj = 0;
	}
	/*
	* Create a delete queue.
	*/
	obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);

	error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
	ASSERT(error == 0);

	/*
	* Create root znode. Create minimal znode/inode/zfsvfs/sb
	* to allow zfs_mknode to work.
	*/
	vattr.va_mask = ATTR_MODE\|ATTR_UID\|ATTR_GID;
	vattr.va_mode = S_IFDIR\|0755;
	vattr.va_uid = crgetuid(cr);
	vattr.va_gid = crgetgid(cr);

	rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
	rootzp->z_unlinked = B_FALSE;
	rootzp->z_atime_dirty = B_FALSE;
	rootzp->z_is_sa = USE_SA(version, os);
	rootzp->z_pflags = 0;

	zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
	zfsvfs->z_os = os;
	zfsvfs->z_parent = zfsvfs;
	zfsvfs->z_version = version;
	zfsvfs->z_use_fuids = USE_FUIDS(version, os);
	zfsvfs->z_use_sa = USE_SA(version, os);
	zfsvfs->z_norm = norm;

	sb = kmem_zalloc(sizeof (struct super_block), KM_SLEEP);
	sb->s_fs_info = zfsvfs;

	ZTOI(rootzp)->i_sb = sb;

	error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
	&zfsvfs->z_attr_table);

	ASSERT(error == 0);

	/*
	* Fold case on file systems that are always or sometimes case
	* insensitive.
	*/
	if (sense == ZFS_CASE_INSENSITIVE \|\| sense == ZFS_CASE_MIXED)
	zfsvfs->z_norm \|= U8_TEXTPREP_TOUPPER;

	mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
	offsetof(znode_t, z_link_node));

	size = MIN(1 << (highbit64(zfs_object_mutex_size)-1), ZFS_OBJ_MTX_MAX);
	zfsvfs->z_hold_size = size;
	zfsvfs->z_hold_trees = vmem_zalloc(sizeof (avl_tree_t) * size,
	KM_SLEEP);
	zfsvfs->z_hold_locks = vmem_zalloc(sizeof (kmutex_t) * size, KM_SLEEP);
	for (i = 0; i != size; i++) {
	avl_create(&zfsvfs->z_hold_trees[i], zfs_znode_hold_compare,
	sizeof (znode_hold_t), offsetof(znode_hold_t, zh_node));
	mutex_init(&zfsvfs->z_hold_locks[i], NULL, MUTEX_DEFAULT, NULL);
	}

	VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
	cr, NULL, &acl_ids));
	zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
	ASSERT3P(zp, ==, rootzp);
	error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
	ASSERT(error == 0);
	zfs_acl_ids_free(&acl_ids);

	atomic_set(&ZTOI(rootzp)->i_count, 0);
	sa_handle_destroy(rootzp->z_sa_hdl);
	kmem_cache_free(znode_cache, rootzp);

	for (i = 0; i != size; i++) {
	avl_destroy(&zfsvfs->z_hold_trees[i]);
	mutex_destroy(&zfsvfs->z_hold_locks[i]);
	}

	mutex_destroy(&zfsvfs->z_znodes_lock);

	vmem_free(zfsvfs->z_hold_trees, sizeof (avl_tree_t) * size);
	vmem_free(zfsvfs->z_hold_locks, sizeof (kmutex_t) * size);
	kmem_free(sb, sizeof (struct super_block));
	kmem_free(zfsvfs, sizeof (zfsvfs_t));
	}
	#endif /* _KERNEL */

	static int
	zfs_sa_setup(objset_t osp, sa_attr_type_t *sa_table)
	{
	uint64_t sa_obj = 0;
	int error;

	error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
	if (error != 0 && error != ENOENT)
	return (error);

	error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
	return (error);
	}

	static int
	zfs_grab_sa_handle(objset_t osp, uint64_t obj, sa_handle_t *hdlp,
	dmu_buf_t *db, void tag)
	{
	dmu_object_info_t doi;
	int error;

	if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
	return (error);

	dmu_object_info_from_db(*db, &doi);
	if ((doi.doi_bonus_type != DMU_OT_SA &&
	doi.doi_bonus_type != DMU_OT_ZNODE) \|\|
	(doi.doi_bonus_type == DMU_OT_ZNODE &&
	doi.doi_bonus_size < sizeof (znode_phys_t))) {
	sa_buf_rele(*db, tag);
	return (SET_ERROR(ENOTSUP));
	}

	error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
	if (error != 0) {
	sa_buf_rele(*db, tag);
	return (error);
	}

	return (0);
	}

	static void
	zfs_release_sa_handle(sa_handle_t hdl, dmu_buf_t db, void *tag)
	{
	sa_handle_destroy(hdl);
	sa_buf_rele(db, tag);
	}

	/*
	* Given an object number, return its parent object number and whether
	* or not the object is an extended attribute directory.
	*/
	static int
	zfs_obj_to_pobj(objset_t osp, sa_handle_t hdl, sa_attr_type_t *sa_table,
	uint64_t pobjp, int is_xattrdir)
	{
	uint64_t parent;
	uint64_t pflags;
	uint64_t mode;
	uint64_t parent_mode;
	sa_bulk_attr_t bulk[3];
	sa_handle_t *sa_hdl;
	dmu_buf_t *sa_db;
	int count = 0;
	int error;

	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
	&parent, sizeof (parent));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
	&pflags, sizeof (pflags));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
	&mode, sizeof (mode));

	if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
	return (error);

	/*
	* When a link is removed its parent pointer is not changed and will
	* be invalid. There are two cases where a link is removed but the
	* file stays around, when it goes to the delete queue and when there
	* are additional links.
	*/
	error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
	if (error != 0)
	return (error);

	error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
	zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
	if (error != 0)
	return (error);

	*is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);

	/*
	* Extended attributes can be applied to files, directories, etc.
	* Otherwise the parent must be a directory.
	*/
	if (!*is_xattrdir && !S_ISDIR(parent_mode))
	return (SET_ERROR(EINVAL));

	*pobjp = parent;

	return (0);
	}

	/*
	* Given an object number, return some zpl level statistics
	*/
	static int
	zfs_obj_to_stats_impl(sa_handle_t hdl, sa_attr_type_t sa_table,
	zfs_stat_t *sb)
	{
	sa_bulk_attr_t bulk[4];
	int count = 0;

	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
	&sb->zs_mode, sizeof (sb->zs_mode));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
	&sb->zs_gen, sizeof (sb->zs_gen));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
	&sb->zs_links, sizeof (sb->zs_links));
	SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
	&sb->zs_ctime, sizeof (sb->zs_ctime));

	return (sa_bulk_lookup(hdl, bulk, count));
	}

	static int
	zfs_obj_to_path_impl(objset_t osp, uint64_t obj, sa_handle_t hdl,
	sa_attr_type_t sa_table, char buf, int len)
	{
	sa_handle_t *sa_hdl;
	sa_handle_t *prevhdl = NULL;
	dmu_buf_t *prevdb = NULL;
	dmu_buf_t *sa_db = NULL;
	char *path = buf + len - 1;
	int error;

	*path = '\0';
	sa_hdl = hdl;

	uint64_t deleteq_obj;
	VERIFY0(zap_lookup(osp, MASTER_NODE_OBJ,
	ZFS_UNLINKED_SET, sizeof (uint64_t), 1, &deleteq_obj));
	error = zap_lookup_int(osp, deleteq_obj, obj);
	if (error == 0) {
	return (ESTALE);
	} else if (error != ENOENT) {
	return (error);
	}
	error = 0;

	for (;;) {
	uint64_t pobj = 0;
	char component[MAXNAMELEN + 2];
	size_t complen;
	int is_xattrdir = 0;

	if (prevdb) {
	ASSERT(prevhdl != NULL);
	zfs_release_sa_handle(prevhdl, prevdb, FTAG);
	}

	if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
	&is_xattrdir)) != 0)
	break;

	if (pobj == obj) {
	if (path[0] != '/')
	*--path = '/';
	break;
	}

	component[0] = '/';
	if (is_xattrdir) {
	(void) sprintf(component + 1, "<xattrdir>");
	} else {
	error = zap_value_search(osp, pobj, obj,
	ZFS_DIRENT_OBJ(-1ULL), component + 1);
	if (error != 0)
	break;
	}

	complen = strlen(component);
	path -= complen;
	ASSERT(path >= buf);
	bcopy(component, path, complen);
	obj = pobj;

	if (sa_hdl != hdl) {
	prevhdl = sa_hdl;
	prevdb = sa_db;
	}
	error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
	if (error != 0) {
	sa_hdl = prevhdl;
	sa_db = prevdb;
	break;
	}
	}

	if (sa_hdl != NULL && sa_hdl != hdl) {
	ASSERT(sa_db != NULL);
	zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
	}

	if (error == 0)
	(void) memmove(buf, path, buf + len - path);

	return (error);
	}

	int
	zfs_obj_to_path(objset_t osp, uint64_t obj, char buf, int len)
	{
	sa_attr_type_t *sa_table;
	sa_handle_t *hdl;
	dmu_buf_t *db;
	int error;

	error = zfs_sa_setup(osp, &sa_table);
	if (error != 0)
	return (error);

	error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
	if (error != 0)
	return (error);

	error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);

	zfs_release_sa_handle(hdl, db, FTAG);
	return (error);
	}

	int
	zfs_obj_to_stats(objset_t osp, uint64_t obj, zfs_stat_t sb,
	char *buf, int len)
	{
	char *path = buf + len - 1;
	sa_attr_type_t *sa_table;
	sa_handle_t *hdl;
	dmu_buf_t *db;
	int error;

	*path = '\0';

	error = zfs_sa_setup(osp, &sa_table);
	if (error != 0)
	return (error);

	error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
	if (error != 0)
	return (error);

	error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
	if (error != 0) {
	zfs_release_sa_handle(hdl, db, FTAG);
	return (error);
	}

	error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);

	zfs_release_sa_handle(hdl, db, FTAG);
	return (error);
	}

	#if defined(_KERNEL)
	EXPORT_SYMBOL(zfs_create_fs);
	EXPORT_SYMBOL(zfs_obj_to_path);

	/* CSTYLED */
	module_param(zfs_object_mutex_size, uint, 0644);
	MODULE_PARM_DESC(zfs_object_mutex_size, "Size of znode hold array");
	module_param(zfs_unlink_suspend_progress, int, 0644);
	MODULE_PARM_DESC(zfs_unlink_suspend_progress, "Set to prevent async unlinks "
	"(debug - leaks space into the unlinked set)");
	#endif
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/zpl_file.c b/sys/contrib/openzfs/module/os/linux/zfs/zpl_file.c
	index 524c43dcded4..63002fe3b932 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/zpl_file.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/zpl_file.c
	@@ -1,1066 +1,1083 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
	* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
	*/


	#ifdef CONFIG_COMPAT
	#include <linux/compat.h>
	#endif
	#include <sys/file.h>
	#include <sys/dmu_objset.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/zfs_vnops.h>
	#include <sys/zfs_project.h>
	+#ifdef HAVE_VFS_SET_PAGE_DIRTY_NOBUFFERS
	+#include <linux/pagemap.h>
	+#endif

	/*
	* When using fallocate(2) to preallocate space, inflate the requested
	* capacity check by 10% to account for the required metadata blocks.
	*/
	unsigned int zfs_fallocate_reserve_percent = 110;

	static int
	zpl_open(struct inode ip, struct file filp)
	{
	cred_t *cr = CRED();
	int error;
	fstrans_cookie_t cookie;

	error = generic_file_open(ip, filp);
	if (error)
	return (error);

	crhold(cr);
	cookie = spl_fstrans_mark();
	error = -zfs_open(ip, filp->f_mode, filp->f_flags, cr);
	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	zpl_release(struct inode ip, struct file filp)
	{
	cred_t *cr = CRED();
	int error;
	fstrans_cookie_t cookie;

	cookie = spl_fstrans_mark();
	if (ITOZ(ip)->z_atime_dirty)
	zfs_mark_inode_dirty(ip);

	crhold(cr);
	error = -zfs_close(ip, filp->f_flags, cr);
	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	zpl_iterate(struct file filp, zpl_dir_context_t ctx)
	{
	cred_t *cr = CRED();
	int error;
	fstrans_cookie_t cookie;

	crhold(cr);
	cookie = spl_fstrans_mark();
	error = -zfs_readdir(file_inode(filp), ctx, cr);
	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
	static int
	zpl_readdir(struct file filp, void dirent, filldir_t filldir)
	{
	zpl_dir_context_t ctx =
	ZPL_DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos);
	int error;

	error = zpl_iterate(filp, &ctx);
	filp->f_pos = ctx.pos;

	return (error);
	}
	#endif /* !HAVE_VFS_ITERATE && !HAVE_VFS_ITERATE_SHARED */

	#if defined(HAVE_FSYNC_WITHOUT_DENTRY)
	/*
	* Linux 2.6.35 - 3.0 API,
	* As of 2.6.35 the dentry argument to the fops->fsync() hook was deemed
	* redundant. The dentry is still accessible via filp->f_path.dentry,
	* and we are guaranteed that filp will never be NULL.
	*/
	static int
	zpl_fsync(struct file *filp, int datasync)
	{
	struct inode *inode = filp->f_mapping->host;
	cred_t *cr = CRED();
	int error;
	fstrans_cookie_t cookie;

	crhold(cr);
	cookie = spl_fstrans_mark();
	error = -zfs_fsync(ITOZ(inode), datasync, cr);
	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	#ifdef HAVE_FILE_AIO_FSYNC
	static int
	zpl_aio_fsync(struct kiocb *kiocb, int datasync)
	{
	return (zpl_fsync(kiocb->ki_filp, datasync));
	}
	#endif

	#elif defined(HAVE_FSYNC_RANGE)
	/*
	* Linux 3.1 API,
	* As of 3.1 the responsibility to call filemap_write_and_wait_range() has
	* been pushed down in to the .fsync() vfs hook. Additionally, the i_mutex
	* lock is no longer held by the caller, for zfs we don't require the lock
	* to be held so we don't acquire it.
	*/
	static int
	zpl_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
	{
	struct inode *inode = filp->f_mapping->host;
	cred_t *cr = CRED();
	int error;
	fstrans_cookie_t cookie;

	error = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (error)
	return (error);

	crhold(cr);
	cookie = spl_fstrans_mark();
	error = -zfs_fsync(ITOZ(inode), datasync, cr);
	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	#ifdef HAVE_FILE_AIO_FSYNC
	static int
	zpl_aio_fsync(struct kiocb *kiocb, int datasync)
	{
	return (zpl_fsync(kiocb->ki_filp, kiocb->ki_pos, -1, datasync));
	}
	#endif

	#else
	#error "Unsupported fops->fsync() implementation"
	#endif

	static inline int
	zfs_io_flags(struct kiocb *kiocb)
	{
	int flags = 0;

	#if defined(IOCB_DSYNC)
	if (kiocb->ki_flags & IOCB_DSYNC)
	flags \|= O_DSYNC;
	#endif
	#if defined(IOCB_SYNC)
	if (kiocb->ki_flags & IOCB_SYNC)
	flags \|= O_SYNC;
	#endif
	#if defined(IOCB_APPEND)
	if (kiocb->ki_flags & IOCB_APPEND)
	flags \|= O_APPEND;
	#endif
	#if defined(IOCB_DIRECT)
	if (kiocb->ki_flags & IOCB_DIRECT)
	flags \|= O_DIRECT;
	#endif
	return (flags);
	}

	/*
	* If relatime is enabled, call file_accessed() if zfs_relatime_need_update()
	* is true. This is needed since datasets with inherited "relatime" property
	* aren't necessarily mounted with the MNT_RELATIME flag (e.g. after
	* `zfs set relatime=...`), which is what relatime test in VFS by
	* relatime_need_update() is based on.
	*/
	static inline void
	zpl_file_accessed(struct file *filp)
	{
	struct inode *ip = filp->f_mapping->host;

	if (!IS_NOATIME(ip) && ITOZSB(ip)->z_relatime) {
	if (zfs_relatime_need_update(ip))
	file_accessed(filp);
	} else {
	file_accessed(filp);
	}
	}

	#if defined(HAVE_VFS_RW_ITERATE)

	/*
	* When HAVE_VFS_IOV_ITER is defined the iov_iter structure supports
	* iovecs, kvevs, bvecs and pipes, plus all the required interfaces to
	* manipulate the iov_iter are available. In which case the full iov_iter
	* can be attached to the uio and correctly handled in the lower layers.
	* Otherwise, for older kernels extract the iovec and pass it instead.
	*/
	static void
	zpl_uio_init(zfs_uio_t uio, struct kiocb kiocb, struct iov_iter *to,
	loff_t pos, ssize_t count, size_t skip)
	{
	#if defined(HAVE_VFS_IOV_ITER)
	zfs_uio_iov_iter_init(uio, to, pos, count, skip);
	#else
	zfs_uio_iovec_init(uio, to->iov, to->nr_segs, pos,
	to->type & ITER_KVEC ? UIO_SYSSPACE : UIO_USERSPACE,
	count, skip);
	#endif
	}

	static ssize_t
	zpl_iter_read(struct kiocb kiocb, struct iov_iter to)
	{
	cred_t *cr = CRED();
	fstrans_cookie_t cookie;
	struct file *filp = kiocb->ki_filp;
	ssize_t count = iov_iter_count(to);
	zfs_uio_t uio;

	zpl_uio_init(&uio, kiocb, to, kiocb->ki_pos, count, 0);

	crhold(cr);
	cookie = spl_fstrans_mark();

	int error = -zfs_read(ITOZ(filp->f_mapping->host), &uio,
	filp->f_flags \| zfs_io_flags(kiocb), cr);

	spl_fstrans_unmark(cookie);
	crfree(cr);

	if (error < 0)
	return (error);

	ssize_t read = count - uio.uio_resid;
	kiocb->ki_pos += read;

	zpl_file_accessed(filp);

	return (read);
	}

	static inline ssize_t
	zpl_generic_write_checks(struct kiocb kiocb, struct iov_iter from,
	size_t *countp)
	{
	#ifdef HAVE_GENERIC_WRITE_CHECKS_KIOCB
	ssize_t ret = generic_write_checks(kiocb, from);
	if (ret <= 0)
	return (ret);

	*countp = ret;
	#else
	struct file *file = kiocb->ki_filp;
	struct address_space *mapping = file->f_mapping;
	struct inode *ip = mapping->host;
	int isblk = S_ISBLK(ip->i_mode);

	*countp = iov_iter_count(from);
	ssize_t ret = generic_write_checks(file, &kiocb->ki_pos, countp, isblk);
	if (ret)
	return (ret);
	#endif

	return (0);
	}

	static ssize_t
	zpl_iter_write(struct kiocb kiocb, struct iov_iter from)
	{
	cred_t *cr = CRED();
	fstrans_cookie_t cookie;
	struct file *filp = kiocb->ki_filp;
	struct inode *ip = filp->f_mapping->host;
	zfs_uio_t uio;
	size_t count = 0;
	ssize_t ret;

	ret = zpl_generic_write_checks(kiocb, from, &count);
	if (ret)
	return (ret);

	zpl_uio_init(&uio, kiocb, from, kiocb->ki_pos, count, from->iov_offset);

	crhold(cr);
	cookie = spl_fstrans_mark();

	int error = -zfs_write(ITOZ(ip), &uio,
	filp->f_flags \| zfs_io_flags(kiocb), cr);

	spl_fstrans_unmark(cookie);
	crfree(cr);

	if (error < 0)
	return (error);

	ssize_t wrote = count - uio.uio_resid;
	kiocb->ki_pos += wrote;

	return (wrote);
	}

	#else /* !HAVE_VFS_RW_ITERATE */

	static ssize_t
	zpl_aio_read(struct kiocb kiocb, const struct iovec iov,
	unsigned long nr_segs, loff_t pos)
	{
	cred_t *cr = CRED();
	fstrans_cookie_t cookie;
	struct file *filp = kiocb->ki_filp;
	size_t count;
	ssize_t ret;

	ret = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
	if (ret)
	return (ret);

	zfs_uio_t uio;
	zfs_uio_iovec_init(&uio, iov, nr_segs, kiocb->ki_pos, UIO_USERSPACE,
	count, 0);

	crhold(cr);
	cookie = spl_fstrans_mark();

	int error = -zfs_read(ITOZ(filp->f_mapping->host), &uio,
	filp->f_flags \| zfs_io_flags(kiocb), cr);

	spl_fstrans_unmark(cookie);
	crfree(cr);

	if (error < 0)
	return (error);

	ssize_t read = count - uio.uio_resid;
	kiocb->ki_pos += read;

	zpl_file_accessed(filp);

	return (read);
	}

	static ssize_t
	zpl_aio_write(struct kiocb kiocb, const struct iovec iov,
	unsigned long nr_segs, loff_t pos)
	{
	cred_t *cr = CRED();
	fstrans_cookie_t cookie;
	struct file *filp = kiocb->ki_filp;
	struct inode *ip = filp->f_mapping->host;
	size_t count;
	ssize_t ret;

	ret = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
	if (ret)
	return (ret);

	ret = generic_write_checks(filp, &pos, &count, S_ISBLK(ip->i_mode));
	if (ret)
	return (ret);

	zfs_uio_t uio;
	zfs_uio_iovec_init(&uio, iov, nr_segs, kiocb->ki_pos, UIO_USERSPACE,
	count, 0);

	crhold(cr);
	cookie = spl_fstrans_mark();

	int error = -zfs_write(ITOZ(ip), &uio,
	filp->f_flags \| zfs_io_flags(kiocb), cr);

	spl_fstrans_unmark(cookie);
	crfree(cr);

	if (error < 0)
	return (error);

	ssize_t wrote = count - uio.uio_resid;
	kiocb->ki_pos += wrote;

	return (wrote);
	}
	#endif /* HAVE_VFS_RW_ITERATE */

	#if defined(HAVE_VFS_RW_ITERATE)
	static ssize_t
	zpl_direct_IO_impl(int rw, struct kiocb kiocb, struct iov_iter iter)
	{
	if (rw == WRITE)
	return (zpl_iter_write(kiocb, iter));
	else
	return (zpl_iter_read(kiocb, iter));
	}
	#if defined(HAVE_VFS_DIRECT_IO_ITER)
	static ssize_t
	zpl_direct_IO(struct kiocb kiocb, struct iov_iter iter)
	{
	return (zpl_direct_IO_impl(iov_iter_rw(iter), kiocb, iter));
	}
	#elif defined(HAVE_VFS_DIRECT_IO_ITER_OFFSET)
	static ssize_t
	zpl_direct_IO(struct kiocb kiocb, struct iov_iter iter, loff_t pos)
	{
	ASSERT3S(pos, ==, kiocb->ki_pos);
	return (zpl_direct_IO_impl(iov_iter_rw(iter), kiocb, iter));
	}
	#elif defined(HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET)
	static ssize_t
	zpl_direct_IO(int rw, struct kiocb kiocb, struct iov_iter iter, loff_t pos)
	{
	ASSERT3S(pos, ==, kiocb->ki_pos);
	return (zpl_direct_IO_impl(rw, kiocb, iter));
	}
	#else
	#error "Unknown direct IO interface"
	#endif

	#else /* HAVE_VFS_RW_ITERATE */

	#if defined(HAVE_VFS_DIRECT_IO_IOVEC)
	static ssize_t
	zpl_direct_IO(int rw, struct kiocb kiocb, const struct iovec iov,
	loff_t pos, unsigned long nr_segs)
	{
	if (rw == WRITE)
	return (zpl_aio_write(kiocb, iov, nr_segs, pos));
	else
	return (zpl_aio_read(kiocb, iov, nr_segs, pos));
	}
	#elif defined(HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET)
	static ssize_t
	zpl_direct_IO(int rw, struct kiocb kiocb, struct iov_iter iter, loff_t pos)
	{
	const struct iovec *iovp = iov_iter_iovec(iter);
	unsigned long nr_segs = iter->nr_segs;

	ASSERT3S(pos, ==, kiocb->ki_pos);
	if (rw == WRITE)
	return (zpl_aio_write(kiocb, iovp, nr_segs, pos));
	else
	return (zpl_aio_read(kiocb, iovp, nr_segs, pos));
	}
	#else
	#error "Unknown direct IO interface"
	#endif

	#endif /* HAVE_VFS_RW_ITERATE */

	static loff_t
	zpl_llseek(struct file *filp, loff_t offset, int whence)
	{
	#if defined(SEEK_HOLE) && defined(SEEK_DATA)
	fstrans_cookie_t cookie;

	if (whence == SEEK_DATA \|\| whence == SEEK_HOLE) {
	struct inode *ip = filp->f_mapping->host;
	loff_t maxbytes = ip->i_sb->s_maxbytes;
	loff_t error;

	spl_inode_lock_shared(ip);
	cookie = spl_fstrans_mark();
	error = -zfs_holey(ITOZ(ip), whence, &offset);
	spl_fstrans_unmark(cookie);
	if (error == 0)
	error = lseek_execute(filp, ip, offset, maxbytes);
	spl_inode_unlock_shared(ip);

	return (error);
	}
	#endif /* SEEK_HOLE && SEEK_DATA */

	return (generic_file_llseek(filp, offset, whence));
	}

	/*
	* It's worth taking a moment to describe how mmap is implemented
	* for zfs because it differs considerably from other Linux filesystems.
	* However, this issue is handled the same way under OpenSolaris.
	*
	* The issue is that by design zfs bypasses the Linux page cache and
	* leaves all caching up to the ARC. This has been shown to work
	* well for the common read(2)/write(2) case. However, mmap(2)
	* is problem because it relies on being tightly integrated with the
	* page cache. To handle this we cache mmap'ed files twice, once in
	* the ARC and a second time in the page cache. The code is careful
	* to keep both copies synchronized.
	*
	* When a file with an mmap'ed region is written to using write(2)
	* both the data in the ARC and existing pages in the page cache
	* are updated. For a read(2) data will be read first from the page
	* cache then the ARC if needed. Neither a write(2) or read(2) will
	* will ever result in new pages being added to the page cache.
	*
	* New pages are added to the page cache only via .readpage() which
	* is called when the vfs needs to read a page off disk to back the
	* virtual memory region. These pages may be modified without
	* notifying the ARC and will be written out periodically via
	* .writepage(). This will occur due to either a sync or the usual
	* page aging behavior. Note because a read(2) of a mmap'ed file
	* will always check the page cache first even when the ARC is out
	* of date correct data will still be returned.
	*
	* While this implementation ensures correct behavior it does have
	* have some drawbacks. The most obvious of which is that it
	* increases the required memory footprint when access mmap'ed
	* files. It also adds additional complexity to the code keeping
	* both caches synchronized.
	*
	* Longer term it may be possible to cleanly resolve this wart by
	* mapping page cache pages directly on to the ARC buffers. The
	* Linux address space operations are flexible enough to allow
	* selection of which pages back a particular index. The trick
	* would be working out the details of which subsystem is in
	* charge, the ARC, the page cache, or both. It may also prove
	* helpful to move the ARC buffers to a scatter-gather lists
	* rather than a vmalloc'ed region.
	*/
	static int
	zpl_mmap(struct file filp, struct vm_area_struct vma)
	{
	struct inode *ip = filp->f_mapping->host;
	znode_t *zp = ITOZ(ip);
	int error;
	fstrans_cookie_t cookie;

	cookie = spl_fstrans_mark();
	error = -zfs_map(ip, vma->vm_pgoff, (caddr_t *)vma->vm_start,
	(size_t)(vma->vm_end - vma->vm_start), vma->vm_flags);
	spl_fstrans_unmark(cookie);
	if (error)
	return (error);

	error = generic_file_mmap(filp, vma);
	if (error)
	return (error);

	mutex_enter(&zp->z_lock);
	zp->z_is_mapped = B_TRUE;
	mutex_exit(&zp->z_lock);

	return (error);
	}

	/*
	* Populate a page with data for the Linux page cache. This function is
	* only used to support mmap(2). There will be an identical copy of the
	* data in the ARC which is kept up to date via .write() and .writepage().
	*/
	-static int
	-zpl_readpage(struct file filp, struct page pp)
	+static inline int
	+zpl_readpage_common(struct page *pp)
	{
	struct inode *ip;
	struct page *pl[1];
	int error = 0;
	fstrans_cookie_t cookie;

	ASSERT(PageLocked(pp));
	ip = pp->mapping->host;
	pl[0] = pp;

	cookie = spl_fstrans_mark();
	error = -zfs_getpage(ip, pl, 1);
	spl_fstrans_unmark(cookie);

	if (error) {
	SetPageError(pp);
	ClearPageUptodate(pp);
	} else {
	ClearPageError(pp);
	SetPageUptodate(pp);
	flush_dcache_page(pp);
	}

	unlock_page(pp);
	return (error);
	}

	+static int
	+zpl_readpage(struct file filp, struct page pp)
	+{
	+ return (zpl_readpage_common(pp));
	+}
	+
	+static int
	+zpl_readpage_filler(void data, struct page pp)
	+{
	+ return (zpl_readpage_common(pp));
	+}
	+
	/*
	* Populate a set of pages with data for the Linux page cache. This
	* function will only be called for read ahead and never for demand
	* paging. For simplicity, the code relies on read_cache_pages() to
	* correctly lock each page for IO and call zpl_readpage().
	*/
	static int
	zpl_readpages(struct file filp, struct address_space mapping,
	struct list_head *pages, unsigned nr_pages)
	{
	- return (read_cache_pages(mapping, pages,
	- (filler_t *)zpl_readpage, filp));
	+ return (read_cache_pages(mapping, pages, zpl_readpage_filler, NULL));
	}

	static int
	zpl_putpage(struct page pp, struct writeback_control wbc, void *data)
	{
	struct address_space *mapping = data;
	fstrans_cookie_t cookie;

	ASSERT(PageLocked(pp));
	ASSERT(!PageWriteback(pp));

	cookie = spl_fstrans_mark();
	(void) zfs_putpage(mapping->host, pp, wbc);
	spl_fstrans_unmark(cookie);

	return (0);
	}

	static int
	zpl_writepages(struct address_space mapping, struct writeback_control wbc)
	{
	znode_t *zp = ITOZ(mapping->host);
	zfsvfs_t *zfsvfs = ITOZSB(mapping->host);
	enum writeback_sync_modes sync_mode;
	int result;

	ZPL_ENTER(zfsvfs);
	if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
	wbc->sync_mode = WB_SYNC_ALL;
	ZPL_EXIT(zfsvfs);
	sync_mode = wbc->sync_mode;

	/*
	* We don't want to run write_cache_pages() in SYNC mode here, because
	* that would make putpage() wait for a single page to be committed to
	* disk every single time, resulting in atrocious performance. Instead
	* we run it once in non-SYNC mode so that the ZIL gets all the data,
	* and then we commit it all in one go.
	*/
	wbc->sync_mode = WB_SYNC_NONE;
	result = write_cache_pages(mapping, wbc, zpl_putpage, mapping);
	if (sync_mode != wbc->sync_mode) {
	ZPL_ENTER(zfsvfs);
	ZPL_VERIFY_ZP(zp);
	if (zfsvfs->z_log != NULL)
	zil_commit(zfsvfs->z_log, zp->z_id);
	ZPL_EXIT(zfsvfs);

	/*
	* We need to call write_cache_pages() again (we can't just
	* return after the commit) because the previous call in
	* non-SYNC mode does not guarantee that we got all the dirty
	* pages (see the implementation of write_cache_pages() for
	* details). That being said, this is a no-op in most cases.
	*/
	wbc->sync_mode = sync_mode;
	result = write_cache_pages(mapping, wbc, zpl_putpage, mapping);
	}
	return (result);
	}

	/*
	* Write out dirty pages to the ARC, this function is only required to
	* support mmap(2). Mapped pages may be dirtied by memory operations
	* which never call .write(). These dirty pages are kept in sync with
	* the ARC buffers via this hook.
	*/
	static int
	zpl_writepage(struct page pp, struct writeback_control wbc)
	{
	if (ITOZSB(pp->mapping->host)->z_os->os_sync == ZFS_SYNC_ALWAYS)
	wbc->sync_mode = WB_SYNC_ALL;

	return (zpl_putpage(pp, wbc, pp->mapping));
	}

	/*
	* The flag combination which matches the behavior of zfs_space() is
	* FALLOC_FL_KEEP_SIZE \| FALLOC_FL_PUNCH_HOLE. The FALLOC_FL_PUNCH_HOLE
	* flag was introduced in the 2.6.38 kernel.
	*
	* The original mode=0 (allocate space) behavior can be reasonably emulated
	* by checking if enough space exists and creating a sparse file, as real
	* persistent space reservation is not possible due to COW, snapshots, etc.
	*/
	static long
	zpl_fallocate_common(struct inode *ip, int mode, loff_t offset, loff_t len)
	{
	cred_t *cr = CRED();
	loff_t olen;
	fstrans_cookie_t cookie;
	int error = 0;

	if ((mode & ~(FALLOC_FL_KEEP_SIZE \| FALLOC_FL_PUNCH_HOLE)) != 0)
	return (-EOPNOTSUPP);

	if (offset < 0 \|\| len <= 0)
	return (-EINVAL);

	spl_inode_lock(ip);
	olen = i_size_read(ip);

	crhold(cr);
	cookie = spl_fstrans_mark();
	if (mode & FALLOC_FL_PUNCH_HOLE) {
	flock64_t bf;

	if (offset > olen)
	goto out_unmark;

	if (offset + len > olen)
	len = olen - offset;
	bf.l_type = F_WRLCK;
	bf.l_whence = SEEK_SET;
	bf.l_start = offset;
	bf.l_len = len;
	bf.l_pid = 0;

	error = -zfs_space(ITOZ(ip), F_FREESP, &bf, O_RDWR, offset, cr);
	} else if ((mode & ~FALLOC_FL_KEEP_SIZE) == 0) {
	unsigned int percent = zfs_fallocate_reserve_percent;
	struct kstatfs statfs;

	/* Legacy mode, disable fallocate compatibility. */
	if (percent == 0) {
	error = -EOPNOTSUPP;
	goto out_unmark;
	}

	/*
	* Use zfs_statvfs() instead of dmu_objset_space() since it
	* also checks project quota limits, which are relevant here.
	*/
	error = zfs_statvfs(ip, &statfs);
	if (error)
	goto out_unmark;

	/*
	* Shrink available space a bit to account for overhead/races.
	* We know the product previously fit into availbytes from
	* dmu_objset_space(), so the smaller product will also fit.
	*/
	if (len > statfs.f_bavail * (statfs.f_bsize * 100 / percent)) {
	error = -ENOSPC;
	goto out_unmark;
	}
	if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > olen)
	error = zfs_freesp(ITOZ(ip), offset + len, 0, 0, FALSE);
	}
	out_unmark:
	spl_fstrans_unmark(cookie);
	spl_inode_unlock(ip);

	crfree(cr);

	return (error);
	}

	static long
	zpl_fallocate(struct file *filp, int mode, loff_t offset, loff_t len)
	{
	return zpl_fallocate_common(file_inode(filp),
	mode, offset, len);
	}

	#define ZFS_FL_USER_VISIBLE (FS_FL_USER_VISIBLE \| ZFS_PROJINHERIT_FL)
	#define ZFS_FL_USER_MODIFIABLE (FS_FL_USER_MODIFIABLE \| ZFS_PROJINHERIT_FL)

	static uint32_t
	__zpl_ioctl_getflags(struct inode *ip)
	{
	uint64_t zfs_flags = ITOZ(ip)->z_pflags;
	uint32_t ioctl_flags = 0;

	if (zfs_flags & ZFS_IMMUTABLE)
	ioctl_flags \|= FS_IMMUTABLE_FL;

	if (zfs_flags & ZFS_APPENDONLY)
	ioctl_flags \|= FS_APPEND_FL;

	if (zfs_flags & ZFS_NODUMP)
	ioctl_flags \|= FS_NODUMP_FL;

	if (zfs_flags & ZFS_PROJINHERIT)
	ioctl_flags \|= ZFS_PROJINHERIT_FL;

	return (ioctl_flags & ZFS_FL_USER_VISIBLE);
	}

	/*
	* Map zfs file z_pflags (xvattr_t) to linux file attributes. Only file
	* attributes common to both Linux and Solaris are mapped.
	*/
	static int
	zpl_ioctl_getflags(struct file filp, void __user arg)
	{
	uint32_t flags;
	int err;

	flags = __zpl_ioctl_getflags(file_inode(filp));
	err = copy_to_user(arg, &flags, sizeof (flags));

	return (err);
	}

	/*
	* fchange() is a helper macro to detect if we have been asked to change a
	* flag. This is ugly, but the requirement that we do this is a consequence of
	* how the Linux file attribute interface was designed. Another consequence is
	* that concurrent modification of files suffers from a TOCTOU race. Neither
	* are things we can fix without modifying the kernel-userland interface, which
	* is outside of our jurisdiction.
	*/

	#define fchange(f0, f1, b0, b1) (!((f0) & (b0)) != !((f1) & (b1)))

	static int
	__zpl_ioctl_setflags(struct inode ip, uint32_t ioctl_flags, xvattr_t xva)
	{
	uint64_t zfs_flags = ITOZ(ip)->z_pflags;
	xoptattr_t *xoap;

	if (ioctl_flags & ~(FS_IMMUTABLE_FL \| FS_APPEND_FL \| FS_NODUMP_FL \|
	ZFS_PROJINHERIT_FL))
	return (-EOPNOTSUPP);

	if (ioctl_flags & ~ZFS_FL_USER_MODIFIABLE)
	return (-EACCES);

	if ((fchange(ioctl_flags, zfs_flags, FS_IMMUTABLE_FL, ZFS_IMMUTABLE) \|\|
	fchange(ioctl_flags, zfs_flags, FS_APPEND_FL, ZFS_APPENDONLY)) &&
	!capable(CAP_LINUX_IMMUTABLE))
	return (-EPERM);

	if (!zpl_inode_owner_or_capable(kcred->user_ns, ip))
	return (-EACCES);

	xva_init(xva);
	xoap = xva_getxoptattr(xva);

	XVA_SET_REQ(xva, XAT_IMMUTABLE);
	if (ioctl_flags & FS_IMMUTABLE_FL)
	xoap->xoa_immutable = B_TRUE;

	XVA_SET_REQ(xva, XAT_APPENDONLY);
	if (ioctl_flags & FS_APPEND_FL)
	xoap->xoa_appendonly = B_TRUE;

	XVA_SET_REQ(xva, XAT_NODUMP);
	if (ioctl_flags & FS_NODUMP_FL)
	xoap->xoa_nodump = B_TRUE;

	XVA_SET_REQ(xva, XAT_PROJINHERIT);
	if (ioctl_flags & ZFS_PROJINHERIT_FL)
	xoap->xoa_projinherit = B_TRUE;

	return (0);
	}

	static int
	zpl_ioctl_setflags(struct file filp, void __user arg)
	{
	struct inode *ip = file_inode(filp);
	uint32_t flags;
	cred_t *cr = CRED();
	xvattr_t xva;
	int err;
	fstrans_cookie_t cookie;

	if (copy_from_user(&flags, arg, sizeof (flags)))
	return (-EFAULT);

	err = __zpl_ioctl_setflags(ip, flags, &xva);
	if (err)
	return (err);

	crhold(cr);
	cookie = spl_fstrans_mark();
	err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr);
	spl_fstrans_unmark(cookie);
	crfree(cr);

	return (err);
	}

	static int
	zpl_ioctl_getxattr(struct file filp, void __user arg)
	{
	zfsxattr_t fsx = { 0 };
	struct inode *ip = file_inode(filp);
	int err;

	fsx.fsx_xflags = __zpl_ioctl_getflags(ip);
	fsx.fsx_projid = ITOZ(ip)->z_projid;
	err = copy_to_user(arg, &fsx, sizeof (fsx));

	return (err);
	}

	static int
	zpl_ioctl_setxattr(struct file filp, void __user arg)
	{
	struct inode *ip = file_inode(filp);
	zfsxattr_t fsx;
	cred_t *cr = CRED();
	xvattr_t xva;
	xoptattr_t *xoap;
	int err;
	fstrans_cookie_t cookie;

	if (copy_from_user(&fsx, arg, sizeof (fsx)))
	return (-EFAULT);

	if (!zpl_is_valid_projid(fsx.fsx_projid))
	return (-EINVAL);

	err = __zpl_ioctl_setflags(ip, fsx.fsx_xflags, &xva);
	if (err)
	return (err);

	xoap = xva_getxoptattr(&xva);
	XVA_SET_REQ(&xva, XAT_PROJID);
	xoap->xoa_projid = fsx.fsx_projid;

	crhold(cr);
	cookie = spl_fstrans_mark();
	err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr);
	spl_fstrans_unmark(cookie);
	crfree(cr);

	return (err);
	}

	static long
	zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	{
	switch (cmd) {
	case FS_IOC_GETFLAGS:
	return (zpl_ioctl_getflags(filp, (void *)arg));
	case FS_IOC_SETFLAGS:
	return (zpl_ioctl_setflags(filp, (void *)arg));
	case ZFS_IOC_FSGETXATTR:
	return (zpl_ioctl_getxattr(filp, (void *)arg));
	case ZFS_IOC_FSSETXATTR:
	return (zpl_ioctl_setxattr(filp, (void *)arg));
	default:
	return (-ENOTTY);
	}
	}

	#ifdef CONFIG_COMPAT
	static long
	zpl_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	{
	switch (cmd) {
	case FS_IOC32_GETFLAGS:
	cmd = FS_IOC_GETFLAGS;
	break;
	case FS_IOC32_SETFLAGS:
	cmd = FS_IOC_SETFLAGS;
	break;
	default:
	return (-ENOTTY);
	}
	return (zpl_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)));
	}
	#endif /* CONFIG_COMPAT */


	const struct address_space_operations zpl_address_space_operations = {
	.readpages = zpl_readpages,
	.readpage = zpl_readpage,
	.writepage = zpl_writepage,
	.writepages = zpl_writepages,
	.direct_IO = zpl_direct_IO,
	+#ifdef HAVE_VFS_SET_PAGE_DIRTY_NOBUFFERS
	+ .set_page_dirty = __set_page_dirty_nobuffers,
	+#endif
	};

	const struct file_operations zpl_file_operations = {
	.open = zpl_open,
	.release = zpl_release,
	.llseek = zpl_llseek,
	#ifdef HAVE_VFS_RW_ITERATE
	#ifdef HAVE_NEW_SYNC_READ
	.read = new_sync_read,
	.write = new_sync_write,
	#endif
	.read_iter = zpl_iter_read,
	.write_iter = zpl_iter_write,
	#ifdef HAVE_VFS_IOV_ITER
	.splice_read = generic_file_splice_read,
	.splice_write = iter_file_splice_write,
	#endif
	#else
	.read = do_sync_read,
	.write = do_sync_write,
	.aio_read = zpl_aio_read,
	.aio_write = zpl_aio_write,
	#endif
	.mmap = zpl_mmap,
	.fsync = zpl_fsync,
	#ifdef HAVE_FILE_AIO_FSYNC
	.aio_fsync = zpl_aio_fsync,
	#endif
	.fallocate = zpl_fallocate,
	.unlocked_ioctl = zpl_ioctl,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = zpl_compat_ioctl,
	#endif
	};

	const struct file_operations zpl_dir_file_operations = {
	.llseek = generic_file_llseek,
	.read = generic_read_dir,
	#if defined(HAVE_VFS_ITERATE_SHARED)
	.iterate_shared = zpl_iterate,
	#elif defined(HAVE_VFS_ITERATE)
	.iterate = zpl_iterate,
	#else
	.readdir = zpl_readdir,
	#endif
	.fsync = zpl_fsync,
	.unlocked_ioctl = zpl_ioctl,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = zpl_compat_ioctl,
	#endif
	};

	/* BEGIN CSTYLED */
	module_param(zfs_fallocate_reserve_percent, uint, 0644);
	MODULE_PARM_DESC(zfs_fallocate_reserve_percent,
	"Percentage of length to use for the available capacity check");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/zpl_inode.c b/sys/contrib/openzfs/module/os/linux/zfs/zpl_inode.c
	index 98c2fb3a0c92..24a8b036bf0f 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/zpl_inode.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/zpl_inode.c
	@@ -1,804 +1,832 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
	* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
	*/


	#include <sys/zfs_ctldir.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/zfs_vnops.h>
	#include <sys/zfs_znode.h>
	#include <sys/dmu_objset.h>
	#include <sys/vfs.h>
	#include <sys/zpl.h>
	#include <sys/file.h>


	static struct dentry *
	zpl_lookup(struct inode dir, struct dentry dentry, unsigned int flags)
	{
	cred_t *cr = CRED();
	struct inode *ip;
	znode_t *zp;
	int error;
	fstrans_cookie_t cookie;
	pathname_t *ppn = NULL;
	pathname_t pn;
	int zfs_flags = 0;
	zfsvfs_t *zfsvfs = dentry->d_sb->s_fs_info;

	if (dlen(dentry) >= ZAP_MAXNAMELEN)
	return (ERR_PTR(-ENAMETOOLONG));

	crhold(cr);
	cookie = spl_fstrans_mark();

	/* If we are a case insensitive fs, we need the real name */
	if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
	zfs_flags = FIGNORECASE;
	pn_alloc(&pn);
	ppn = &pn;
	}

	error = -zfs_lookup(ITOZ(dir), dname(dentry), &zp,
	zfs_flags, cr, NULL, ppn);
	spl_fstrans_unmark(cookie);
	ASSERT3S(error, <=, 0);
	crfree(cr);

	spin_lock(&dentry->d_lock);
	dentry->d_time = jiffies;
	spin_unlock(&dentry->d_lock);

	if (error) {
	/*
	* If we have a case sensitive fs, we do not want to
	* insert negative entries, so return NULL for ENOENT.
	* Fall through if the error is not ENOENT. Also free memory.
	*/
	if (ppn) {
	pn_free(ppn);
	if (error == -ENOENT)
	return (NULL);
	}

	if (error == -ENOENT)
	return (d_splice_alias(NULL, dentry));
	else
	return (ERR_PTR(error));
	}
	ip = ZTOI(zp);

	/*
	* If we are case insensitive, call the correct function
	* to install the name.
	*/
	if (ppn) {
	struct dentry *new_dentry;
	struct qstr ci_name;

	if (strcmp(dname(dentry), pn.pn_buf) == 0) {
	new_dentry = d_splice_alias(ip, dentry);
	} else {
	ci_name.name = pn.pn_buf;
	ci_name.len = strlen(pn.pn_buf);
	new_dentry = d_add_ci(dentry, ip, &ci_name);
	}
	pn_free(ppn);
	return (new_dentry);
	} else {
	return (d_splice_alias(ip, dentry));
	}
	}

	void
	zpl_vap_init(vattr_t vap, struct inode dir, umode_t mode, cred_t *cr)
	{
	vap->va_mask = ATTR_MODE;
	vap->va_mode = mode;
	vap->va_uid = crgetfsuid(cr);

	if (dir && dir->i_mode & S_ISGID) {
	vap->va_gid = KGID_TO_SGID(dir->i_gid);
	if (S_ISDIR(mode))
	vap->va_mode \|= S_ISGID;
	} else {
	vap->va_gid = crgetfsgid(cr);
	}
	}

	static int
	#ifdef HAVE_IOPS_CREATE_USERNS
	zpl_create(struct user_namespace user_ns, struct inode dir,
	struct dentry *dentry, umode_t mode, bool flag)
	#else
	zpl_create(struct inode dir, struct dentry dentry, umode_t mode, bool flag)
	#endif
	{
	cred_t *cr = CRED();
	znode_t *zp;
	vattr_t *vap;
	int error;
	fstrans_cookie_t cookie;

	crhold(cr);
	vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
	zpl_vap_init(vap, dir, mode, cr);

	cookie = spl_fstrans_mark();
	error = -zfs_create(ITOZ(dir), dname(dentry), vap, 0,
	mode, &zp, cr, 0, NULL);
	if (error == 0) {
	error = zpl_xattr_security_init(ZTOI(zp), dir, &dentry->d_name);
	if (error == 0)
	error = zpl_init_acl(ZTOI(zp), dir);

	if (error) {
	(void) zfs_remove(ITOZ(dir), dname(dentry), cr, 0);
	remove_inode_hash(ZTOI(zp));
	iput(ZTOI(zp));
	} else {
	d_instantiate(dentry, ZTOI(zp));
	}
	}

	spl_fstrans_unmark(cookie);
	kmem_free(vap, sizeof (vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	#ifdef HAVE_IOPS_MKNOD_USERNS
	zpl_mknod(struct user_namespace user_ns, struct inode dir,
	struct dentry *dentry, umode_t mode,
	#else
	zpl_mknod(struct inode dir, struct dentry dentry, umode_t mode,
	#endif
	dev_t rdev)
	{
	cred_t *cr = CRED();
	znode_t *zp;
	vattr_t *vap;
	int error;
	fstrans_cookie_t cookie;

	/*
	* We currently expect Linux to supply rdev=0 for all sockets
	* and fifos, but we want to know if this behavior ever changes.
	*/
	if (S_ISSOCK(mode) \|\| S_ISFIFO(mode))
	ASSERT(rdev == 0);

	crhold(cr);
	vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
	zpl_vap_init(vap, dir, mode, cr);
	vap->va_rdev = rdev;

	cookie = spl_fstrans_mark();
	error = -zfs_create(ITOZ(dir), dname(dentry), vap, 0,
	mode, &zp, cr, 0, NULL);
	if (error == 0) {
	error = zpl_xattr_security_init(ZTOI(zp), dir, &dentry->d_name);
	if (error == 0)
	error = zpl_init_acl(ZTOI(zp), dir);

	if (error) {
	(void) zfs_remove(ITOZ(dir), dname(dentry), cr, 0);
	remove_inode_hash(ZTOI(zp));
	iput(ZTOI(zp));
	} else {
	d_instantiate(dentry, ZTOI(zp));
	}
	}

	spl_fstrans_unmark(cookie);
	kmem_free(vap, sizeof (vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	#ifdef HAVE_TMPFILE
	static int
	#ifdef HAVE_TMPFILE_USERNS
	zpl_tmpfile(struct user_namespace userns, struct inode dir,
	struct dentry *dentry, umode_t mode)
	#else
	zpl_tmpfile(struct inode dir, struct dentry dentry, umode_t mode)
	#endif
	{
	cred_t *cr = CRED();
	struct inode *ip;
	vattr_t *vap;
	int error;
	fstrans_cookie_t cookie;

	crhold(cr);
	vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
	/*
	* The VFS does not apply the umask, therefore it is applied here
	* when POSIX ACLs are not enabled.
	*/
	if (!IS_POSIXACL(dir))
	mode &= ~current_umask();
	zpl_vap_init(vap, dir, mode, cr);

	cookie = spl_fstrans_mark();
	error = -zfs_tmpfile(dir, vap, 0, mode, &ip, cr, 0, NULL);
	if (error == 0) {
	/* d_tmpfile will do drop_nlink, so we should set it first */
	set_nlink(ip, 1);
	d_tmpfile(dentry, ip);

	error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
	if (error == 0)
	error = zpl_init_acl(ip, dir);
	/*
	* don't need to handle error here, file is already in
	* unlinked set.
	*/
	}

	spl_fstrans_unmark(cookie);
	kmem_free(vap, sizeof (vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}
	#endif

	static int
	zpl_unlink(struct inode dir, struct dentry dentry)
	{
	cred_t *cr = CRED();
	int error;
	fstrans_cookie_t cookie;
	zfsvfs_t *zfsvfs = dentry->d_sb->s_fs_info;

	crhold(cr);
	cookie = spl_fstrans_mark();
	error = -zfs_remove(ITOZ(dir), dname(dentry), cr, 0);

	/*
	* For a CI FS we must invalidate the dentry to prevent the
	* creation of negative entries.
	*/
	if (error == 0 && zfsvfs->z_case == ZFS_CASE_INSENSITIVE)
	d_invalidate(dentry);

	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	#ifdef HAVE_IOPS_MKDIR_USERNS
	zpl_mkdir(struct user_namespace user_ns, struct inode dir,
	struct dentry *dentry, umode_t mode)
	#else
	zpl_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	#endif
	{
	cred_t *cr = CRED();
	vattr_t *vap;
	znode_t *zp;
	int error;
	fstrans_cookie_t cookie;

	crhold(cr);
	vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
	zpl_vap_init(vap, dir, mode \| S_IFDIR, cr);

	cookie = spl_fstrans_mark();
	error = -zfs_mkdir(ITOZ(dir), dname(dentry), vap, &zp, cr, 0, NULL);
	if (error == 0) {
	error = zpl_xattr_security_init(ZTOI(zp), dir, &dentry->d_name);
	if (error == 0)
	error = zpl_init_acl(ZTOI(zp), dir);

	if (error) {
	(void) zfs_rmdir(ITOZ(dir), dname(dentry), NULL, cr, 0);
	remove_inode_hash(ZTOI(zp));
	iput(ZTOI(zp));
	} else {
	d_instantiate(dentry, ZTOI(zp));
	}
	}

	spl_fstrans_unmark(cookie);
	kmem_free(vap, sizeof (vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	zpl_rmdir(struct inode dir, struct dentry dentry)
	{
	cred_t *cr = CRED();
	int error;
	fstrans_cookie_t cookie;
	zfsvfs_t *zfsvfs = dentry->d_sb->s_fs_info;

	crhold(cr);
	cookie = spl_fstrans_mark();
	error = -zfs_rmdir(ITOZ(dir), dname(dentry), NULL, cr, 0);

	/*
	* For a CI FS we must invalidate the dentry to prevent the
	* creation of negative entries.
	*/
	if (error == 0 && zfsvfs->z_case == ZFS_CASE_INSENSITIVE)
	d_invalidate(dentry);

	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	#ifdef HAVE_USERNS_IOPS_GETATTR
	zpl_getattr_impl(struct user_namespace *user_ns,
	const struct path path, struct kstat stat, u32 request_mask,
	unsigned int query_flags)
	#else
	zpl_getattr_impl(const struct path path, struct kstat stat, u32 request_mask,
	unsigned int query_flags)
	#endif
	{
	int error;
	fstrans_cookie_t cookie;
	+ struct inode *ip = path->dentry->d_inode;
	+ znode_t *zp __maybe_unused = ITOZ(ip);

	cookie = spl_fstrans_mark();

	/*
	- * XXX request_mask and query_flags currently ignored.
	+ * XXX query_flags currently ignored.
	*/

	#ifdef HAVE_USERNS_IOPS_GETATTR
	- error = -zfs_getattr_fast(user_ns, path->dentry->d_inode, stat);
	+ error = -zfs_getattr_fast(user_ns, ip, stat);
	#else
	- error = -zfs_getattr_fast(kcred->user_ns, path->dentry->d_inode, stat);
	+ error = -zfs_getattr_fast(kcred->user_ns, ip, stat);
	#endif
	+
	+#ifdef STATX_BTIME
	+ if (request_mask & STATX_BTIME) {
	+ stat->btime = zp->z_btime;
	+ stat->result_mask \|= STATX_BTIME;
	+ }
	+#endif
	+
	+#ifdef STATX_ATTR_IMMUTABLE
	+ if (zp->z_pflags & ZFS_IMMUTABLE)
	+ stat->attributes \|= STATX_ATTR_IMMUTABLE;
	+ stat->attributes_mask \|= STATX_ATTR_IMMUTABLE;
	+#endif
	+
	+#ifdef STATX_ATTR_APPEND
	+ if (zp->z_pflags & ZFS_APPENDONLY)
	+ stat->attributes \|= STATX_ATTR_APPEND;
	+ stat->attributes_mask \|= STATX_ATTR_APPEND;
	+#endif
	+
	+#ifdef STATX_ATTR_NODUMP
	+ if (zp->z_pflags & ZFS_NODUMP)
	+ stat->attributes \|= STATX_ATTR_NODUMP;
	+ stat->attributes_mask \|= STATX_ATTR_NODUMP;
	+#endif
	+
	spl_fstrans_unmark(cookie);
	ASSERT3S(error, <=, 0);

	return (error);
	}
	ZPL_GETATTR_WRAPPER(zpl_getattr);

	static int
	#ifdef HAVE_SETATTR_PREPARE_USERNS
	zpl_setattr(struct user_namespace user_ns, struct dentry dentry,
	struct iattr *ia)
	#else
	zpl_setattr(struct dentry dentry, struct iattr ia)
	#endif
	{
	struct inode *ip = dentry->d_inode;
	cred_t *cr = CRED();
	vattr_t *vap;
	int error;
	fstrans_cookie_t cookie;

	error = zpl_setattr_prepare(kcred->user_ns, dentry, ia);
	if (error)
	return (error);

	crhold(cr);
	vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
	vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
	vap->va_mode = ia->ia_mode;
	vap->va_uid = KUID_TO_SUID(ia->ia_uid);
	vap->va_gid = KGID_TO_SGID(ia->ia_gid);
	vap->va_size = ia->ia_size;
	vap->va_atime = ia->ia_atime;
	vap->va_mtime = ia->ia_mtime;
	vap->va_ctime = ia->ia_ctime;

	if (vap->va_mask & ATTR_ATIME)
	ip->i_atime = zpl_inode_timestamp_truncate(ia->ia_atime, ip);

	cookie = spl_fstrans_mark();
	error = -zfs_setattr(ITOZ(ip), vap, 0, cr);
	if (!error && (ia->ia_valid & ATTR_MODE))
	error = zpl_chmod_acl(ip);

	spl_fstrans_unmark(cookie);
	kmem_free(vap, sizeof (vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	#ifdef HAVE_IOPS_RENAME_USERNS
	zpl_rename2(struct user_namespace user_ns, struct inode sdip,
	struct dentry sdentry, struct inode tdip, struct dentry *tdentry,
	unsigned int flags)
	#else
	zpl_rename2(struct inode sdip, struct dentry sdentry,
	struct inode tdip, struct dentry tdentry, unsigned int flags)
	#endif
	{
	cred_t *cr = CRED();
	int error;
	fstrans_cookie_t cookie;

	/* We don't have renameat2(2) support */
	if (flags)
	return (-EINVAL);

	crhold(cr);
	cookie = spl_fstrans_mark();
	error = -zfs_rename(ITOZ(sdip), dname(sdentry), ITOZ(tdip),
	dname(tdentry), cr, 0);
	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	#if !defined(HAVE_RENAME_WANTS_FLAGS) && !defined(HAVE_IOPS_RENAME_USERNS)
	static int
	zpl_rename(struct inode sdip, struct dentry sdentry,
	struct inode tdip, struct dentry tdentry)
	{
	return (zpl_rename2(sdip, sdentry, tdip, tdentry, 0));
	}
	#endif

	static int
	#ifdef HAVE_IOPS_SYMLINK_USERNS
	zpl_symlink(struct user_namespace user_ns, struct inode dir,
	struct dentry dentry, const char name)
	#else
	zpl_symlink(struct inode dir, struct dentry dentry, const char *name)
	#endif
	{
	cred_t *cr = CRED();
	vattr_t *vap;
	znode_t *zp;
	int error;
	fstrans_cookie_t cookie;

	crhold(cr);
	vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
	zpl_vap_init(vap, dir, S_IFLNK \| S_IRWXUGO, cr);

	cookie = spl_fstrans_mark();
	error = -zfs_symlink(ITOZ(dir), dname(dentry), vap,
	(char *)name, &zp, cr, 0);
	if (error == 0) {
	error = zpl_xattr_security_init(ZTOI(zp), dir, &dentry->d_name);
	if (error) {
	(void) zfs_remove(ITOZ(dir), dname(dentry), cr, 0);
	remove_inode_hash(ZTOI(zp));
	iput(ZTOI(zp));
	} else {
	d_instantiate(dentry, ZTOI(zp));
	}
	}

	spl_fstrans_unmark(cookie);
	kmem_free(vap, sizeof (vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	#if defined(HAVE_PUT_LINK_COOKIE)
	static void
	zpl_put_link(struct inode unused, void cookie)
	{
	kmem_free(cookie, MAXPATHLEN);
	}
	#elif defined(HAVE_PUT_LINK_NAMEIDATA)
	static void
	zpl_put_link(struct dentry dentry, struct nameidata nd, void *ptr)
	{
	const char *link = nd_get_link(nd);

	if (!IS_ERR(link))
	kmem_free(link, MAXPATHLEN);
	}
	#elif defined(HAVE_PUT_LINK_DELAYED)
	static void
	zpl_put_link(void *ptr)
	{
	kmem_free(ptr, MAXPATHLEN);
	}
	#endif

	static int
	zpl_get_link_common(struct dentry dentry, struct inode ip, char **link)
	{
	fstrans_cookie_t cookie;
	cred_t *cr = CRED();
	int error;

	crhold(cr);
	*link = NULL;

	struct iovec iov;
	iov.iov_len = MAXPATHLEN;
	iov.iov_base = kmem_zalloc(MAXPATHLEN, KM_SLEEP);

	zfs_uio_t uio;
	zfs_uio_iovec_init(&uio, &iov, 1, 0, UIO_SYSSPACE, MAXPATHLEN - 1, 0);

	cookie = spl_fstrans_mark();
	error = -zfs_readlink(ip, &uio, cr);
	spl_fstrans_unmark(cookie);
	crfree(cr);

	if (error)
	kmem_free(iov.iov_base, MAXPATHLEN);
	else
	*link = iov.iov_base;

	return (error);
	}

	#if defined(HAVE_GET_LINK_DELAYED)
	static const char *
	zpl_get_link(struct dentry dentry, struct inode inode,
	struct delayed_call *done)
	{
	char *link = NULL;
	int error;

	if (!dentry)
	return (ERR_PTR(-ECHILD));

	error = zpl_get_link_common(dentry, inode, &link);
	if (error)
	return (ERR_PTR(error));

	set_delayed_call(done, zpl_put_link, link);

	return (link);
	}
	#elif defined(HAVE_GET_LINK_COOKIE)
	static const char *
	zpl_get_link(struct dentry dentry, struct inode inode, void **cookie)
	{
	char *link = NULL;
	int error;

	if (!dentry)
	return (ERR_PTR(-ECHILD));

	error = zpl_get_link_common(dentry, inode, &link);
	if (error)
	return (ERR_PTR(error));

	return (*cookie = link);
	}
	#elif defined(HAVE_FOLLOW_LINK_COOKIE)
	static const char *
	zpl_follow_link(struct dentry dentry, void *cookie)
	{
	char *link = NULL;
	int error;

	error = zpl_get_link_common(dentry, dentry->d_inode, &link);
	if (error)
	return (ERR_PTR(error));

	return (*cookie = link);
	}
	#elif defined(HAVE_FOLLOW_LINK_NAMEIDATA)
	static void *
	zpl_follow_link(struct dentry dentry, struct nameidata nd)
	{
	char *link = NULL;
	int error;

	error = zpl_get_link_common(dentry, dentry->d_inode, &link);
	if (error)
	nd_set_link(nd, ERR_PTR(error));
	else
	nd_set_link(nd, link);

	return (NULL);
	}
	#endif

	static int
	zpl_link(struct dentry old_dentry, struct inode dir, struct dentry *dentry)
	{
	cred_t *cr = CRED();
	struct inode *ip = old_dentry->d_inode;
	int error;
	fstrans_cookie_t cookie;

	if (ip->i_nlink >= ZFS_LINK_MAX)
	return (-EMLINK);

	crhold(cr);
	ip->i_ctime = current_time(ip);
	/* Must have an existing ref, so igrab() cannot return NULL */
	VERIFY3P(igrab(ip), !=, NULL);

	cookie = spl_fstrans_mark();
	error = -zfs_link(ITOZ(dir), ITOZ(ip), dname(dentry), cr, 0);
	if (error) {
	iput(ip);
	goto out;
	}

	d_instantiate(dentry, ip);
	out:
	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	#ifdef HAVE_D_REVALIDATE_NAMEIDATA
	zpl_revalidate(struct dentry dentry, struct nameidata nd)
	{
	unsigned int flags = (nd ? nd->flags : 0);
	#else
	zpl_revalidate(struct dentry *dentry, unsigned int flags)
	{
	#endif /* HAVE_D_REVALIDATE_NAMEIDATA */
	/* CSTYLED */
	zfsvfs_t *zfsvfs = dentry->d_sb->s_fs_info;
	int error;

	if (flags & LOOKUP_RCU)
	return (-ECHILD);

	/*
	* After a rollback negative dentries created before the rollback
	* time must be invalidated. Otherwise they can obscure files which
	* are only present in the rolled back dataset.
	*/
	if (dentry->d_inode == NULL) {
	spin_lock(&dentry->d_lock);
	error = time_before(dentry->d_time, zfsvfs->z_rollback_time);
	spin_unlock(&dentry->d_lock);

	if (error)
	return (0);
	}

	/*
	* The dentry may reference a stale inode if a mounted file system
	* was rolled back to a point in time where the object didn't exist.
	*/
	if (dentry->d_inode && ITOZ(dentry->d_inode)->z_is_stale)
	return (0);

	return (1);
	}

	const struct inode_operations zpl_inode_operations = {
	.setattr = zpl_setattr,
	.getattr = zpl_getattr,
	#ifdef HAVE_GENERIC_SETXATTR
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	#endif
	.listxattr = zpl_xattr_list,
	#if defined(CONFIG_FS_POSIX_ACL)
	#if defined(HAVE_SET_ACL)
	.set_acl = zpl_set_acl,
	#endif /* HAVE_SET_ACL */
	.get_acl = zpl_get_acl,
	#endif /* CONFIG_FS_POSIX_ACL */
	};

	const struct inode_operations zpl_dir_inode_operations = {
	.create = zpl_create,
	.lookup = zpl_lookup,
	.link = zpl_link,
	.unlink = zpl_unlink,
	.symlink = zpl_symlink,
	.mkdir = zpl_mkdir,
	.rmdir = zpl_rmdir,
	.mknod = zpl_mknod,
	#if defined(HAVE_RENAME_WANTS_FLAGS) \|\| defined(HAVE_IOPS_RENAME_USERNS)
	.rename = zpl_rename2,
	#else
	.rename = zpl_rename,
	#endif
	#ifdef HAVE_TMPFILE
	.tmpfile = zpl_tmpfile,
	#endif
	.setattr = zpl_setattr,
	.getattr = zpl_getattr,
	#ifdef HAVE_GENERIC_SETXATTR
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	#endif
	.listxattr = zpl_xattr_list,
	#if defined(CONFIG_FS_POSIX_ACL)
	#if defined(HAVE_SET_ACL)
	.set_acl = zpl_set_acl,
	#endif /* HAVE_SET_ACL */
	.get_acl = zpl_get_acl,
	#endif /* CONFIG_FS_POSIX_ACL */
	};

	const struct inode_operations zpl_symlink_inode_operations = {
	#ifdef HAVE_GENERIC_READLINK
	.readlink = generic_readlink,
	#endif
	#if defined(HAVE_GET_LINK_DELAYED) \|\| defined(HAVE_GET_LINK_COOKIE)
	.get_link = zpl_get_link,
	#elif defined(HAVE_FOLLOW_LINK_COOKIE) \|\| defined(HAVE_FOLLOW_LINK_NAMEIDATA)
	.follow_link = zpl_follow_link,
	#endif
	#if defined(HAVE_PUT_LINK_COOKIE) \|\| defined(HAVE_PUT_LINK_NAMEIDATA)
	.put_link = zpl_put_link,
	#endif
	.setattr = zpl_setattr,
	.getattr = zpl_getattr,
	#ifdef HAVE_GENERIC_SETXATTR
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	#endif
	.listxattr = zpl_xattr_list,
	};

	const struct inode_operations zpl_special_inode_operations = {
	.setattr = zpl_setattr,
	.getattr = zpl_getattr,
	#ifdef HAVE_GENERIC_SETXATTR
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	#endif
	.listxattr = zpl_xattr_list,
	#if defined(CONFIG_FS_POSIX_ACL)
	#if defined(HAVE_SET_ACL)
	.set_acl = zpl_set_acl,
	#endif /* HAVE_SET_ACL */
	.get_acl = zpl_get_acl,
	#endif /* CONFIG_FS_POSIX_ACL */
	};

	dentry_operations_t zpl_dentry_operations = {
	.d_revalidate = zpl_revalidate,
	};
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/zpl_xattr.c b/sys/contrib/openzfs/module/os/linux/zfs/zpl_xattr.c
	index c6d4da582be0..928058ef677c 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/zpl_xattr.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/zpl_xattr.c
	@@ -1,1497 +1,1515 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
	*
	* Extended attributes (xattr) on Solaris are implemented as files
	* which exist in a hidden xattr directory. These extended attributes
	* can be accessed using the attropen() system call which opens
	* the extended attribute. It can then be manipulated just like
	* a standard file descriptor. This has a couple advantages such
	* as practically no size limit on the file, and the extended
	* attributes permissions may differ from those of the parent file.
	* This interface is really quite clever, but it's also completely
	* different than what is supported on Linux. It also comes with a
	* steep performance penalty when accessing small xattrs because they
	* are not stored with the parent file.
	*
	* Under Linux extended attributes are manipulated by the system
	* calls getxattr(2), setxattr(2), and listxattr(2). They consider
	* extended attributes to be name/value pairs where the name is a
	* NULL terminated string. The name must also include one of the
	* following namespace prefixes:
	*
	* user - No restrictions and is available to user applications.
	* trusted - Restricted to kernel and root (CAP_SYS_ADMIN) use.
	* system - Used for access control lists (system.nfs4_acl, etc).
	* security - Used by SELinux to store a files security context.
	*
	* The value under Linux to limited to 65536 bytes of binary data.
	* In practice, individual xattrs tend to be much smaller than this
	* and are typically less than 100 bytes. A good example of this
	* are the security.selinux xattrs which are less than 100 bytes and
	* exist for every file when xattr labeling is enabled.
	*
	* The Linux xattr implementation has been written to take advantage of
	* this typical usage. When the dataset property 'xattr=sa' is set,
	* then xattrs will be preferentially stored as System Attributes (SA).
	* This allows tiny xattrs (~100 bytes) to be stored with the dnode and
	* up to 64k of xattrs to be stored in the spill block. If additional
	* xattr space is required, which is unlikely under Linux, they will
	* be stored using the traditional directory approach.
	*
	* This optimization results in roughly a 3x performance improvement
	* when accessing xattrs because it avoids the need to perform a seek
	* for every xattr value. When multiple xattrs are stored per-file
	* the performance improvements are even greater because all of the
	* xattrs stored in the spill block will be cached.
	*
	* However, by default SA based xattrs are disabled in the Linux port
	* to maximize compatibility with other implementations. If you do
	* enable SA based xattrs then they will not be visible on platforms
	* which do not support this feature.
	*
	* NOTE: One additional consequence of the xattr directory implementation
	* is that when an extended attribute is manipulated an inode is created.
	* This inode will exist in the Linux inode cache but there will be no
	* associated entry in the dentry cache which references it. This is
	* safe but it may result in some confusion. Enabling SA based xattrs
	* largely avoids the issue except in the overflow case.
	*/

	#include <sys/zfs_znode.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/zfs_vnops.h>
	#include <sys/zap.h>
	#include <sys/vfs.h>
	#include <sys/zpl.h>

	typedef struct xattr_filldir {
	size_t size;
	size_t offset;
	char *buf;
	struct dentry *dentry;
	} xattr_filldir_t;

	static const struct xattr_handler zpl_xattr_handler(const char );

	static int
	zpl_xattr_permission(xattr_filldir_t xf, const char name, int name_len)
	{
	static const struct xattr_handler *handler;
	struct dentry *d = xf->dentry;

	handler = zpl_xattr_handler(name);
	if (!handler)
	return (0);

	if (handler->list) {
	#if defined(HAVE_XATTR_LIST_SIMPLE)
	if (!handler->list(d))
	return (0);
	#elif defined(HAVE_XATTR_LIST_DENTRY)
	if (!handler->list(d, NULL, 0, name, name_len, 0))
	return (0);
	#elif defined(HAVE_XATTR_LIST_HANDLER)
	if (!handler->list(handler, d, NULL, 0, name, name_len))
	return (0);
	#endif
	}

	return (1);
	}

	/*
	* Determine is a given xattr name should be visible and if so copy it
	* in to the provided buffer (xf->buf).
	*/
	static int
	zpl_xattr_filldir(xattr_filldir_t xf, const char name, int name_len)
	{
	/* Check permissions using the per-namespace list xattr handler. */
	if (!zpl_xattr_permission(xf, name, name_len))
	return (0);

	/* When xf->buf is NULL only calculate the required size. */
	if (xf->buf) {
	if (xf->offset + name_len + 1 > xf->size)
	return (-ERANGE);

	memcpy(xf->buf + xf->offset, name, name_len);
	xf->buf[xf->offset + name_len] = '\0';
	}

	xf->offset += (name_len + 1);

	return (0);
	}

	/*
	* Read as many directory entry names as will fit in to the provided buffer,
	* or when no buffer is provided calculate the required buffer size.
	*/
	static int
	zpl_xattr_readdir(struct inode dxip, xattr_filldir_t xf)
	{
	zap_cursor_t zc;
	zap_attribute_t zap;
	int error;

	zap_cursor_init(&zc, ITOZSB(dxip)->z_os, ITOZ(dxip)->z_id);

	while ((error = -zap_cursor_retrieve(&zc, &zap)) == 0) {

	if (zap.za_integer_length != 8 \|\| zap.za_num_integers != 1) {
	error = -ENXIO;
	break;
	}

	error = zpl_xattr_filldir(xf, zap.za_name, strlen(zap.za_name));
	if (error)
	break;

	zap_cursor_advance(&zc);
	}

	zap_cursor_fini(&zc);

	if (error == -ENOENT)
	error = 0;

	return (error);
	}

	static ssize_t
	zpl_xattr_list_dir(xattr_filldir_t xf, cred_t cr)
	{
	struct inode *ip = xf->dentry->d_inode;
	struct inode *dxip = NULL;
	znode_t *dxzp;
	int error;

	/* Lookup the xattr directory */
	error = -zfs_lookup(ITOZ(ip), NULL, &dxzp, LOOKUP_XATTR,
	cr, NULL, NULL);
	if (error) {
	if (error == -ENOENT)
	error = 0;

	return (error);
	}

	dxip = ZTOI(dxzp);
	error = zpl_xattr_readdir(dxip, xf);
	iput(dxip);

	return (error);
	}

	static ssize_t
	zpl_xattr_list_sa(xattr_filldir_t *xf)
	{
	znode_t *zp = ITOZ(xf->dentry->d_inode);
	nvpair_t *nvp = NULL;
	int error = 0;

	mutex_enter(&zp->z_lock);
	if (zp->z_xattr_cached == NULL)
	error = -zfs_sa_get_xattr(zp);
	mutex_exit(&zp->z_lock);

	if (error)
	return (error);

	ASSERT(zp->z_xattr_cached);

	while ((nvp = nvlist_next_nvpair(zp->z_xattr_cached, nvp)) != NULL) {
	ASSERT3U(nvpair_type(nvp), ==, DATA_TYPE_BYTE_ARRAY);

	error = zpl_xattr_filldir(xf, nvpair_name(nvp),
	strlen(nvpair_name(nvp)));
	if (error)
	return (error);
	}

	return (0);
	}

	ssize_t
	zpl_xattr_list(struct dentry dentry, char buffer, size_t buffer_size)
	{
	znode_t *zp = ITOZ(dentry->d_inode);
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	xattr_filldir_t xf = { buffer_size, 0, buffer, dentry };
	cred_t *cr = CRED();
	fstrans_cookie_t cookie;
	int error = 0;

	crhold(cr);
	cookie = spl_fstrans_mark();
	ZPL_ENTER(zfsvfs);
	ZPL_VERIFY_ZP(zp);
	rw_enter(&zp->z_xattr_lock, RW_READER);

	if (zfsvfs->z_use_sa && zp->z_is_sa) {
	error = zpl_xattr_list_sa(&xf);
	if (error)
	goto out;
	}

	error = zpl_xattr_list_dir(&xf, cr);
	if (error)
	goto out;

	error = xf.offset;
	out:

	rw_exit(&zp->z_xattr_lock);
	ZPL_EXIT(zfsvfs);
	spl_fstrans_unmark(cookie);
	crfree(cr);

	return (error);
	}

	static int
	zpl_xattr_get_dir(struct inode ip, const char name, void *value,
	size_t size, cred_t *cr)
	{
	fstrans_cookie_t cookie;
	struct inode *xip = NULL;
	znode_t *dxzp = NULL;
	znode_t *xzp = NULL;
	int error;

	/* Lookup the xattr directory */
	error = -zfs_lookup(ITOZ(ip), NULL, &dxzp, LOOKUP_XATTR,
	cr, NULL, NULL);
	if (error)
	goto out;

	/* Lookup a specific xattr name in the directory */
	error = -zfs_lookup(dxzp, (char *)name, &xzp, 0, cr, NULL, NULL);
	if (error)
	goto out;

	xip = ZTOI(xzp);
	if (!size) {
	error = i_size_read(xip);
	goto out;
	}

	if (size < i_size_read(xip)) {
	error = -ERANGE;
	goto out;
	}

	struct iovec iov;
	iov.iov_base = (void *)value;
	iov.iov_len = size;

	zfs_uio_t uio;
	zfs_uio_iovec_init(&uio, &iov, 1, 0, UIO_SYSSPACE, size, 0);

	cookie = spl_fstrans_mark();
	error = -zfs_read(ITOZ(xip), &uio, 0, cr);
	spl_fstrans_unmark(cookie);

	if (error == 0)
	error = size - zfs_uio_resid(&uio);
	out:
	if (xzp)
	zrele(xzp);

	if (dxzp)
	zrele(dxzp);

	return (error);
	}

	static int
	zpl_xattr_get_sa(struct inode ip, const char name, void *value, size_t size)
	{
	znode_t *zp = ITOZ(ip);
	uchar_t *nv_value;
	uint_t nv_size;
	int error = 0;

	ASSERT(RW_LOCK_HELD(&zp->z_xattr_lock));

	mutex_enter(&zp->z_lock);
	if (zp->z_xattr_cached == NULL)
	error = -zfs_sa_get_xattr(zp);
	mutex_exit(&zp->z_lock);

	if (error)
	return (error);

	ASSERT(zp->z_xattr_cached);
	error = -nvlist_lookup_byte_array(zp->z_xattr_cached, name,
	&nv_value, &nv_size);
	if (error)
	return (error);

	if (size == 0 \|\| value == NULL)
	return (nv_size);

	if (size < nv_size)
	return (-ERANGE);

	memcpy(value, nv_value, nv_size);

	return (nv_size);
	}

	static int
	__zpl_xattr_get(struct inode ip, const char name, void *value, size_t size,
	cred_t *cr)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	int error;

	ASSERT(RW_LOCK_HELD(&zp->z_xattr_lock));

	if (zfsvfs->z_use_sa && zp->z_is_sa) {
	error = zpl_xattr_get_sa(ip, name, value, size);
	if (error != -ENOENT)
	goto out;
	}

	error = zpl_xattr_get_dir(ip, name, value, size, cr);
	out:
	if (error == -ENOENT)
	error = -ENODATA;

	return (error);
	}

	#define XATTR_NOENT 0x0
	#define XATTR_IN_SA 0x1
	#define XATTR_IN_DIR 0x2
	/* check where the xattr resides */
	static int
	__zpl_xattr_where(struct inode ip, const char name, int where, cred_t cr)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	int error;

	ASSERT(where);
	ASSERT(RW_LOCK_HELD(&zp->z_xattr_lock));

	*where = XATTR_NOENT;
	if (zfsvfs->z_use_sa && zp->z_is_sa) {
	error = zpl_xattr_get_sa(ip, name, NULL, 0);
	if (error >= 0)
	*where \|= XATTR_IN_SA;
	else if (error != -ENOENT)
	return (error);
	}

	error = zpl_xattr_get_dir(ip, name, NULL, 0, cr);
	if (error >= 0)
	*where \|= XATTR_IN_DIR;
	else if (error != -ENOENT)
	return (error);

	if (*where == (XATTR_IN_SA\|XATTR_IN_DIR))
	cmn_err(CE_WARN, "ZFS: inode %p has xattr \"%s\""
	" in both SA and dir", ip, name);
	if (*where == XATTR_NOENT)
	error = -ENODATA;
	else
	error = 0;
	return (error);
	}

	static int
	zpl_xattr_get(struct inode ip, const char name, void *value, size_t size)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	cred_t *cr = CRED();
	fstrans_cookie_t cookie;
	int error;

	crhold(cr);
	cookie = spl_fstrans_mark();
	ZPL_ENTER(zfsvfs);
	ZPL_VERIFY_ZP(zp);
	rw_enter(&zp->z_xattr_lock, RW_READER);
	error = __zpl_xattr_get(ip, name, value, size, cr);
	rw_exit(&zp->z_xattr_lock);
	ZPL_EXIT(zfsvfs);
	spl_fstrans_unmark(cookie);
	crfree(cr);

	return (error);
	}

	static int
	zpl_xattr_set_dir(struct inode ip, const char name, const void *value,
	size_t size, int flags, cred_t *cr)
	{
	znode_t *dxzp = NULL;
	znode_t *xzp = NULL;
	vattr_t *vap = NULL;
	int lookup_flags, error;
	const int xattr_mode = S_IFREG \| 0644;
	loff_t pos = 0;

	/*
	* Lookup the xattr directory. When we're adding an entry pass
	* CREATE_XATTR_DIR to ensure the xattr directory is created.
	* When removing an entry this flag is not passed to avoid
	* unnecessarily creating a new xattr directory.
	*/
	lookup_flags = LOOKUP_XATTR;
	if (value != NULL)
	lookup_flags \|= CREATE_XATTR_DIR;

	error = -zfs_lookup(ITOZ(ip), NULL, &dxzp, lookup_flags,
	cr, NULL, NULL);
	if (error)
	goto out;

	/* Lookup a specific xattr name in the directory */
	error = -zfs_lookup(dxzp, (char *)name, &xzp, 0, cr, NULL, NULL);
	if (error && (error != -ENOENT))
	goto out;

	error = 0;

	/* Remove a specific name xattr when value is set to NULL. */
	if (value == NULL) {
	if (xzp)
	error = -zfs_remove(dxzp, (char *)name, cr, 0);

	goto out;
	}

	/* Lookup failed create a new xattr. */
	if (xzp == NULL) {
	vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
	vap->va_mode = xattr_mode;
	vap->va_mask = ATTR_MODE;
	vap->va_uid = crgetfsuid(cr);
	vap->va_gid = crgetfsgid(cr);

	error = -zfs_create(dxzp, (char *)name, vap, 0, 0644, &xzp,
	cr, 0, NULL);
	if (error)
	goto out;
	}

	ASSERT(xzp != NULL);

	error = -zfs_freesp(xzp, 0, 0, xattr_mode, TRUE);
	if (error)
	goto out;

	error = -zfs_write_simple(xzp, value, size, pos, NULL);
	out:
	if (error == 0) {
	ip->i_ctime = current_time(ip);
	zfs_mark_inode_dirty(ip);
	}

	if (vap)
	kmem_free(vap, sizeof (vattr_t));

	if (xzp)
	zrele(xzp);

	if (dxzp)
	zrele(dxzp);

	if (error == -ENOENT)
	error = -ENODATA;

	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	zpl_xattr_set_sa(struct inode ip, const char name, const void *value,
	size_t size, int flags, cred_t *cr)
	{
	znode_t *zp = ITOZ(ip);
	nvlist_t *nvl;
	size_t sa_size;
	int error = 0;

	mutex_enter(&zp->z_lock);
	if (zp->z_xattr_cached == NULL)
	error = -zfs_sa_get_xattr(zp);
	mutex_exit(&zp->z_lock);

	if (error)
	return (error);

	ASSERT(zp->z_xattr_cached);
	nvl = zp->z_xattr_cached;

	if (value == NULL) {
	error = -nvlist_remove(nvl, name, DATA_TYPE_BYTE_ARRAY);
	if (error == -ENOENT)
	error = zpl_xattr_set_dir(ip, name, NULL, 0, flags, cr);
	} else {
	/* Limited to 32k to keep nvpair memory allocations small */
	if (size > DXATTR_MAX_ENTRY_SIZE)
	return (-EFBIG);

	/* Prevent the DXATTR SA from consuming the entire SA region */
	error = -nvlist_size(nvl, &sa_size, NV_ENCODE_XDR);
	if (error)
	return (error);

	if (sa_size > DXATTR_MAX_SA_SIZE)
	return (-EFBIG);

	error = -nvlist_add_byte_array(nvl, name,
	(uchar_t *)value, size);
	}

	/*
	* Update the SA for additions, modifications, and removals. On
	* error drop the inconsistent cached version of the nvlist, it
	* will be reconstructed from the ARC when next accessed.
	*/
	if (error == 0)
	error = -zfs_sa_set_xattr(zp);

	if (error) {
	nvlist_free(nvl);
	zp->z_xattr_cached = NULL;
	}

	ASSERT3S(error, <=, 0);

	return (error);
	}

	static int
	zpl_xattr_set(struct inode ip, const char name, const void *value,
	size_t size, int flags)
	{
	znode_t *zp = ITOZ(ip);
	zfsvfs_t *zfsvfs = ZTOZSB(zp);
	cred_t *cr = CRED();
	fstrans_cookie_t cookie;
	int where;
	int error;

	crhold(cr);
	cookie = spl_fstrans_mark();
	ZPL_ENTER(zfsvfs);
	ZPL_VERIFY_ZP(zp);
	rw_enter(&ITOZ(ip)->z_xattr_lock, RW_WRITER);

	/*
	* Before setting the xattr check to see if it already exists.
	* This is done to ensure the following optional flags are honored.
	*
	* XATTR_CREATE: fail if xattr already exists
	* XATTR_REPLACE: fail if xattr does not exist
	*
	* We also want to know if it resides in sa or dir, so we can make
	* sure we don't end up with duplicate in both places.
	*/
	error = __zpl_xattr_where(ip, name, &where, cr);
	if (error < 0) {
	if (error != -ENODATA)
	goto out;
	if (flags & XATTR_REPLACE)
	goto out;

	/* The xattr to be removed already doesn't exist */
	error = 0;
	if (value == NULL)
	goto out;
	} else {
	error = -EEXIST;
	if (flags & XATTR_CREATE)
	goto out;
	}

	/* Preferentially store the xattr as a SA for better performance */
	if (zfsvfs->z_use_sa && zp->z_is_sa &&
	(zfsvfs->z_xattr_sa \|\| (value == NULL && where & XATTR_IN_SA))) {
	error = zpl_xattr_set_sa(ip, name, value, size, flags, cr);
	if (error == 0) {
	/*
	* Successfully put into SA, we need to clear the one
	* in dir.
	*/
	if (where & XATTR_IN_DIR)
	zpl_xattr_set_dir(ip, name, NULL, 0, 0, cr);
	goto out;
	}
	}

	error = zpl_xattr_set_dir(ip, name, value, size, flags, cr);
	/*
	* Successfully put into dir, we need to clear the one in SA.
	*/
	if (error == 0 && (where & XATTR_IN_SA))
	zpl_xattr_set_sa(ip, name, NULL, 0, 0, cr);
	out:
	rw_exit(&ITOZ(ip)->z_xattr_lock);
	ZPL_EXIT(zfsvfs);
	spl_fstrans_unmark(cookie);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
	}

	/*
	* Extended user attributes
	*
	* "Extended user attributes may be assigned to files and directories for
	* storing arbitrary additional information such as the mime type,
	* character set or encoding of a file. The access permissions for user
	* attributes are defined by the file permission bits: read permission
	* is required to retrieve the attribute value, and writer permission is
	* required to change it.
	*
	* The file permission bits of regular files and directories are
	* interpreted differently from the file permission bits of special
	* files and symbolic links. For regular files and directories the file
	* permission bits define access to the file's contents, while for
	* device special files they define access to the device described by
	* the special file. The file permissions of symbolic links are not
	* used in access checks. These differences would allow users to
	* consume filesystem resources in a way not controllable by disk quotas
	* for group or world writable special files and directories.
	*
	* For this reason, extended user attributes are allowed only for
	* regular files and directories, and access to extended user attributes
	* is restricted to the owner and to users with appropriate capabilities
	* for directories with the sticky bit set (see the chmod(1) manual page
	* for an explanation of the sticky bit)." - xattr(7)
	*
	* ZFS allows extended user attributes to be disabled administratively
	* by setting the 'xattr=off' property on the dataset.
	*/
	static int
	__zpl_xattr_user_list(struct inode ip, char list, size_t list_size,
	const char *name, size_t name_len)
	{
	return (ITOZSB(ip)->z_flags & ZSB_XATTR);
	}
	ZPL_XATTR_LIST_WRAPPER(zpl_xattr_user_list);

	static int
	__zpl_xattr_user_get(struct inode ip, const char name,
	void *value, size_t size)
	{
	char *xattr_name;
	int error;
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
	return (-EINVAL);
	#endif
	if (!(ITOZSB(ip)->z_flags & ZSB_XATTR))
	return (-EOPNOTSUPP);

	xattr_name = kmem_asprintf("%s%s", XATTR_USER_PREFIX, name);
	error = zpl_xattr_get(ip, xattr_name, value, size);
	kmem_strfree(xattr_name);

	return (error);
	}
	ZPL_XATTR_GET_WRAPPER(zpl_xattr_user_get);

	static int
	__zpl_xattr_user_set(struct inode ip, const char name,
	const void *value, size_t size, int flags)
	{
	char *xattr_name;
	int error;
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
	return (-EINVAL);
	#endif
	if (!(ITOZSB(ip)->z_flags & ZSB_XATTR))
	return (-EOPNOTSUPP);

	xattr_name = kmem_asprintf("%s%s", XATTR_USER_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	kmem_strfree(xattr_name);

	return (error);
	}
	ZPL_XATTR_SET_WRAPPER(zpl_xattr_user_set);

	xattr_handler_t zpl_xattr_user_handler =
	{
	.prefix = XATTR_USER_PREFIX,
	.list = zpl_xattr_user_list,
	.get = zpl_xattr_user_get,
	.set = zpl_xattr_user_set,
	};

	/*
	* Trusted extended attributes
	*
	* "Trusted extended attributes are visible and accessible only to
	* processes that have the CAP_SYS_ADMIN capability. Attributes in this
	* class are used to implement mechanisms in user space (i.e., outside
	* the kernel) which keep information in extended attributes to which
	* ordinary processes should not have access." - xattr(7)
	*/
	static int
	__zpl_xattr_trusted_list(struct inode ip, char list, size_t list_size,
	const char *name, size_t name_len)
	{
	return (capable(CAP_SYS_ADMIN));
	}
	ZPL_XATTR_LIST_WRAPPER(zpl_xattr_trusted_list);

	static int
	__zpl_xattr_trusted_get(struct inode ip, const char name,
	void *value, size_t size)
	{
	char *xattr_name;
	int error;

	if (!capable(CAP_SYS_ADMIN))
	return (-EACCES);
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
	return (-EINVAL);
	#endif
	xattr_name = kmem_asprintf("%s%s", XATTR_TRUSTED_PREFIX, name);
	error = zpl_xattr_get(ip, xattr_name, value, size);
	kmem_strfree(xattr_name);

	return (error);
	}
	ZPL_XATTR_GET_WRAPPER(zpl_xattr_trusted_get);

	static int
	__zpl_xattr_trusted_set(struct inode ip, const char name,
	const void *value, size_t size, int flags)
	{
	char *xattr_name;
	int error;

	if (!capable(CAP_SYS_ADMIN))
	return (-EACCES);
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
	return (-EINVAL);
	#endif
	xattr_name = kmem_asprintf("%s%s", XATTR_TRUSTED_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	kmem_strfree(xattr_name);

	return (error);
	}
	ZPL_XATTR_SET_WRAPPER(zpl_xattr_trusted_set);

	xattr_handler_t zpl_xattr_trusted_handler =
	{
	.prefix = XATTR_TRUSTED_PREFIX,
	.list = zpl_xattr_trusted_list,
	.get = zpl_xattr_trusted_get,
	.set = zpl_xattr_trusted_set,
	};

	/*
	* Extended security attributes
	*
	* "The security attribute namespace is used by kernel security modules,
	* such as Security Enhanced Linux, and also to implement file
	* capabilities (see capabilities(7)). Read and write access
	* permissions to security attributes depend on the policy implemented
	* for each security attribute by the security module. When no security
	* module is loaded, all processes have read access to extended security
	* attributes, and write access is limited to processes that have the
	* CAP_SYS_ADMIN capability." - xattr(7)
	*/
	static int
	__zpl_xattr_security_list(struct inode ip, char list, size_t list_size,
	const char *name, size_t name_len)
	{
	return (1);
	}
	ZPL_XATTR_LIST_WRAPPER(zpl_xattr_security_list);

	static int
	__zpl_xattr_security_get(struct inode ip, const char name,
	void *value, size_t size)
	{
	char *xattr_name;
	int error;
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
	return (-EINVAL);
	#endif
	xattr_name = kmem_asprintf("%s%s", XATTR_SECURITY_PREFIX, name);
	error = zpl_xattr_get(ip, xattr_name, value, size);
	kmem_strfree(xattr_name);

	return (error);
	}
	ZPL_XATTR_GET_WRAPPER(zpl_xattr_security_get);

	static int
	__zpl_xattr_security_set(struct inode ip, const char name,
	const void *value, size_t size, int flags)
	{
	char *xattr_name;
	int error;
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
	return (-EINVAL);
	#endif
	xattr_name = kmem_asprintf("%s%s", XATTR_SECURITY_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	kmem_strfree(xattr_name);

	return (error);
	}
	ZPL_XATTR_SET_WRAPPER(zpl_xattr_security_set);

	static int
	zpl_xattr_security_init_impl(struct inode ip, const struct xattr xattrs,
	void *fs_info)
	{
	const struct xattr *xattr;
	int error = 0;

	for (xattr = xattrs; xattr->name != NULL; xattr++) {
	error = __zpl_xattr_security_set(ip,
	xattr->name, xattr->value, xattr->value_len, 0);

	if (error < 0)
	break;
	}

	return (error);
	}

	int
	zpl_xattr_security_init(struct inode ip, struct inode dip,
	const struct qstr *qstr)
	{
	return security_inode_init_security(ip, dip, qstr,
	&zpl_xattr_security_init_impl, NULL);
	}

	/*
	* Security xattr namespace handlers.
	*/
	xattr_handler_t zpl_xattr_security_handler = {
	.prefix = XATTR_SECURITY_PREFIX,
	.list = zpl_xattr_security_list,
	.get = zpl_xattr_security_get,
	.set = zpl_xattr_security_set,
	};

	/*
	* Extended system attributes
	*
	* "Extended system attributes are used by the kernel to store system
	* objects such as Access Control Lists. Read and write access permissions
	* to system attributes depend on the policy implemented for each system
	* attribute implemented by filesystems in the kernel." - xattr(7)
	*/
	#ifdef CONFIG_FS_POSIX_ACL
	static int
	zpl_set_acl_impl(struct inode ip, struct posix_acl acl, int type)
	{
	char name, value = NULL;
	int error = 0;
	size_t size = 0;

	if (S_ISLNK(ip->i_mode))
	return (-EOPNOTSUPP);

	switch (type) {
	case ACL_TYPE_ACCESS:
	name = XATTR_NAME_POSIX_ACL_ACCESS;
	if (acl) {
	umode_t mode = ip->i_mode;
	error = posix_acl_equiv_mode(acl, &mode);
	if (error < 0) {
	return (error);
	} else {
	/*
	* The mode bits will have been set by
	* ->zfs_setattr()->zfs_acl_chmod_setattr()
	* using the ZFS ACL conversion. If they
	* differ from the Posix ACL conversion dirty
	* the inode to write the Posix mode bits.
	*/
	if (ip->i_mode != mode) {
	ip->i_mode = mode;
	ip->i_ctime = current_time(ip);
	zfs_mark_inode_dirty(ip);
	}

	if (error == 0)
	acl = NULL;
	}
	}
	break;

	case ACL_TYPE_DEFAULT:
	name = XATTR_NAME_POSIX_ACL_DEFAULT;
	if (!S_ISDIR(ip->i_mode))
	return (acl ? -EACCES : 0);
	break;

	default:
	return (-EINVAL);
	}

	if (acl) {
	size = posix_acl_xattr_size(acl->a_count);
	value = kmem_alloc(size, KM_SLEEP);

	error = zpl_acl_to_xattr(acl, value, size);
	if (error < 0) {
	kmem_free(value, size);
	return (error);
	}
	}

	error = zpl_xattr_set(ip, name, value, size, 0);
	if (value)
	kmem_free(value, size);

	if (!error) {
	if (acl)
	zpl_set_cached_acl(ip, type, acl);
	else
	zpl_forget_cached_acl(ip, type);
	}

	return (error);
	}

	#ifdef HAVE_SET_ACL
	int
	#ifdef HAVE_SET_ACL_USERNS
	zpl_set_acl(struct user_namespace userns, struct inode ip,
	struct posix_acl *acl, int type)
	#else
	zpl_set_acl(struct inode ip, struct posix_acl acl, int type)
	#endif /* HAVE_SET_ACL_USERNS */
	{
	return (zpl_set_acl_impl(ip, acl, type));
	}
	#endif /* HAVE_SET_ACL */

	-struct posix_acl *
	-zpl_get_acl(struct inode *ip, int type)
	+static struct posix_acl *
	+zpl_get_acl_impl(struct inode *ip, int type)
	{
	struct posix_acl *acl;
	void *value = NULL;
	char *name;
	- int size;

	/*
	* As of Linux 3.14, the kernel get_acl will check this for us.
	* Also as of Linux 4.7, comparing against ACL_NOT_CACHED is wrong
	* as the kernel get_acl will set it to temporary sentinel value.
	*/
	#ifndef HAVE_KERNEL_GET_ACL_HANDLE_CACHE
	acl = get_cached_acl(ip, type);
	if (acl != ACL_NOT_CACHED)
	return (acl);
	#endif

	switch (type) {
	case ACL_TYPE_ACCESS:
	name = XATTR_NAME_POSIX_ACL_ACCESS;
	break;
	case ACL_TYPE_DEFAULT:
	name = XATTR_NAME_POSIX_ACL_DEFAULT;
	break;
	default:
	return (ERR_PTR(-EINVAL));
	}

	- size = zpl_xattr_get(ip, name, NULL, 0);
	+ int size = zpl_xattr_get(ip, name, NULL, 0);
	if (size > 0) {
	value = kmem_alloc(size, KM_SLEEP);
	size = zpl_xattr_get(ip, name, value, size);
	}

	if (size > 0) {
	acl = zpl_acl_from_xattr(value, size);
	} else if (size == -ENODATA \|\| size == -ENOSYS) {
	acl = NULL;
	} else {
	acl = ERR_PTR(-EIO);
	}

	if (size > 0)
	kmem_free(value, size);

	/* As of Linux 4.7, the kernel get_acl will set this for us */
	#ifndef HAVE_KERNEL_GET_ACL_HANDLE_CACHE
	if (!IS_ERR(acl))
	zpl_set_cached_acl(ip, type, acl);
	#endif

	return (acl);
	}

	+#if defined(HAVE_GET_ACL_RCU)
	+struct posix_acl *
	+zpl_get_acl(struct inode *ip, int type, bool rcu)
	+{
	+ if (rcu)
	+ return (ERR_PTR(-ECHILD));
	+
	+ return (zpl_get_acl_impl(ip, type));
	+}
	+#elif defined(HAVE_GET_ACL)
	+struct posix_acl *
	+zpl_get_acl(struct inode *ip, int type)
	+{
	+ return (zpl_get_acl_impl(ip, type));
	+}
	+#else
	+#error "Unsupported iops->get_acl() implementation"
	+#endif /* HAVE_GET_ACL_RCU */
	+
	int
	zpl_init_acl(struct inode ip, struct inode dir)
	{
	struct posix_acl *acl = NULL;
	int error = 0;

	if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
	return (0);

	if (!S_ISLNK(ip->i_mode)) {
	- acl = zpl_get_acl(dir, ACL_TYPE_DEFAULT);
	+ acl = zpl_get_acl_impl(dir, ACL_TYPE_DEFAULT);
	if (IS_ERR(acl))
	return (PTR_ERR(acl));
	if (!acl) {
	ip->i_mode &= ~current_umask();
	ip->i_ctime = current_time(ip);
	zfs_mark_inode_dirty(ip);
	return (0);
	}
	}

	if (acl) {
	umode_t mode;

	if (S_ISDIR(ip->i_mode)) {
	error = zpl_set_acl_impl(ip, acl, ACL_TYPE_DEFAULT);
	if (error)
	goto out;
	}

	mode = ip->i_mode;
	error = __posix_acl_create(&acl, GFP_KERNEL, &mode);
	if (error >= 0) {
	ip->i_mode = mode;
	zfs_mark_inode_dirty(ip);
	if (error > 0) {
	error = zpl_set_acl_impl(ip, acl,
	ACL_TYPE_ACCESS);
	}
	}
	}
	out:
	zpl_posix_acl_release(acl);

	return (error);
	}

	int
	zpl_chmod_acl(struct inode *ip)
	{
	struct posix_acl *acl;
	int error;

	if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
	return (0);

	if (S_ISLNK(ip->i_mode))
	return (-EOPNOTSUPP);

	- acl = zpl_get_acl(ip, ACL_TYPE_ACCESS);
	+ acl = zpl_get_acl_impl(ip, ACL_TYPE_ACCESS);
	if (IS_ERR(acl) \|\| !acl)
	return (PTR_ERR(acl));

	error = __posix_acl_chmod(&acl, GFP_KERNEL, ip->i_mode);
	if (!error)
	error = zpl_set_acl_impl(ip, acl, ACL_TYPE_ACCESS);

	zpl_posix_acl_release(acl);

	return (error);
	}

	static int
	__zpl_xattr_acl_list_access(struct inode ip, char list, size_t list_size,
	const char *name, size_t name_len)
	{
	char *xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
	size_t xattr_size = sizeof (XATTR_NAME_POSIX_ACL_ACCESS);

	if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
	return (0);

	if (list && xattr_size <= list_size)
	memcpy(list, xattr_name, xattr_size);

	return (xattr_size);
	}
	ZPL_XATTR_LIST_WRAPPER(zpl_xattr_acl_list_access);

	static int
	__zpl_xattr_acl_list_default(struct inode ip, char list, size_t list_size,
	const char *name, size_t name_len)
	{
	char *xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
	size_t xattr_size = sizeof (XATTR_NAME_POSIX_ACL_DEFAULT);

	if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
	return (0);

	if (list && xattr_size <= list_size)
	memcpy(list, xattr_name, xattr_size);

	return (xattr_size);
	}
	ZPL_XATTR_LIST_WRAPPER(zpl_xattr_acl_list_default);

	static int
	__zpl_xattr_acl_get_access(struct inode ip, const char name,
	void *buffer, size_t size)
	{
	struct posix_acl *acl;
	int type = ACL_TYPE_ACCESS;
	int error;
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") != 0)
	return (-EINVAL);
	#endif
	if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
	return (-EOPNOTSUPP);

	- acl = zpl_get_acl(ip, type);
	+ acl = zpl_get_acl_impl(ip, type);
	if (IS_ERR(acl))
	return (PTR_ERR(acl));
	if (acl == NULL)
	return (-ENODATA);

	error = zpl_acl_to_xattr(acl, buffer, size);
	zpl_posix_acl_release(acl);

	return (error);
	}
	ZPL_XATTR_GET_WRAPPER(zpl_xattr_acl_get_access);

	static int
	__zpl_xattr_acl_get_default(struct inode ip, const char name,
	void *buffer, size_t size)
	{
	struct posix_acl *acl;
	int type = ACL_TYPE_DEFAULT;
	int error;
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") != 0)
	return (-EINVAL);
	#endif
	if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
	return (-EOPNOTSUPP);

	- acl = zpl_get_acl(ip, type);
	+ acl = zpl_get_acl_impl(ip, type);
	if (IS_ERR(acl))
	return (PTR_ERR(acl));
	if (acl == NULL)
	return (-ENODATA);

	error = zpl_acl_to_xattr(acl, buffer, size);
	zpl_posix_acl_release(acl);

	return (error);
	}
	ZPL_XATTR_GET_WRAPPER(zpl_xattr_acl_get_default);

	static int
	__zpl_xattr_acl_set_access(struct inode ip, const char name,
	const void *value, size_t size, int flags)
	{
	struct posix_acl *acl;
	int type = ACL_TYPE_ACCESS;
	int error = 0;
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") != 0)
	return (-EINVAL);
	#endif
	if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
	return (-EOPNOTSUPP);

	if (!zpl_inode_owner_or_capable(kcred->user_ns, ip))
	return (-EPERM);

	if (value) {
	acl = zpl_acl_from_xattr(value, size);
	if (IS_ERR(acl))
	return (PTR_ERR(acl));
	else if (acl) {
	error = zpl_posix_acl_valid(ip, acl);
	if (error) {
	zpl_posix_acl_release(acl);
	return (error);
	}
	}
	} else {
	acl = NULL;
	}
	error = zpl_set_acl_impl(ip, acl, type);
	zpl_posix_acl_release(acl);

	return (error);
	}
	ZPL_XATTR_SET_WRAPPER(zpl_xattr_acl_set_access);

	static int
	__zpl_xattr_acl_set_default(struct inode ip, const char name,
	const void *value, size_t size, int flags)
	{
	struct posix_acl *acl;
	int type = ACL_TYPE_DEFAULT;
	int error = 0;
	/* xattr_resolve_name will do this for us if this is defined */
	#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") != 0)
	return (-EINVAL);
	#endif
	if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
	return (-EOPNOTSUPP);

	if (!zpl_inode_owner_or_capable(kcred->user_ns, ip))
	return (-EPERM);

	if (value) {
	acl = zpl_acl_from_xattr(value, size);
	if (IS_ERR(acl))
	return (PTR_ERR(acl));
	else if (acl) {
	error = zpl_posix_acl_valid(ip, acl);
	if (error) {
	zpl_posix_acl_release(acl);
	return (error);
	}
	}
	} else {
	acl = NULL;
	}

	error = zpl_set_acl_impl(ip, acl, type);
	zpl_posix_acl_release(acl);

	return (error);
	}
	ZPL_XATTR_SET_WRAPPER(zpl_xattr_acl_set_default);

	/*
	* ACL access xattr namespace handlers.
	*
	* Use .name instead of .prefix when available. xattr_resolve_name will match
	* whole name and reject anything that has .name only as prefix.
	*/
	xattr_handler_t zpl_xattr_acl_access_handler =
	{
	#ifdef HAVE_XATTR_HANDLER_NAME
	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	#else
	.prefix = XATTR_NAME_POSIX_ACL_ACCESS,
	#endif
	.list = zpl_xattr_acl_list_access,
	.get = zpl_xattr_acl_get_access,
	.set = zpl_xattr_acl_set_access,
	#if defined(HAVE_XATTR_LIST_SIMPLE) \|\| \
	defined(HAVE_XATTR_LIST_DENTRY) \|\| \
	defined(HAVE_XATTR_LIST_HANDLER)
	.flags = ACL_TYPE_ACCESS,
	#endif
	};

	/*
	* ACL default xattr namespace handlers.
	*
	* Use .name instead of .prefix when available. xattr_resolve_name will match
	* whole name and reject anything that has .name only as prefix.
	*/
	xattr_handler_t zpl_xattr_acl_default_handler =
	{
	#ifdef HAVE_XATTR_HANDLER_NAME
	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	#else
	.prefix = XATTR_NAME_POSIX_ACL_DEFAULT,
	#endif
	.list = zpl_xattr_acl_list_default,
	.get = zpl_xattr_acl_get_default,
	.set = zpl_xattr_acl_set_default,
	#if defined(HAVE_XATTR_LIST_SIMPLE) \|\| \
	defined(HAVE_XATTR_LIST_DENTRY) \|\| \
	defined(HAVE_XATTR_LIST_HANDLER)
	.flags = ACL_TYPE_DEFAULT,
	#endif
	};

	#endif /* CONFIG_FS_POSIX_ACL */

	xattr_handler_t *zpl_xattr_handlers[] = {
	&zpl_xattr_security_handler,
	&zpl_xattr_trusted_handler,
	&zpl_xattr_user_handler,
	#ifdef CONFIG_FS_POSIX_ACL
	&zpl_xattr_acl_access_handler,
	&zpl_xattr_acl_default_handler,
	#endif /* CONFIG_FS_POSIX_ACL */
	NULL
	};

	static const struct xattr_handler *
	zpl_xattr_handler(const char *name)
	{
	if (strncmp(name, XATTR_USER_PREFIX,
	XATTR_USER_PREFIX_LEN) == 0)
	return (&zpl_xattr_user_handler);

	if (strncmp(name, XATTR_TRUSTED_PREFIX,
	XATTR_TRUSTED_PREFIX_LEN) == 0)
	return (&zpl_xattr_trusted_handler);

	if (strncmp(name, XATTR_SECURITY_PREFIX,
	XATTR_SECURITY_PREFIX_LEN) == 0)
	return (&zpl_xattr_security_handler);

	#ifdef CONFIG_FS_POSIX_ACL
	if (strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
	sizeof (XATTR_NAME_POSIX_ACL_ACCESS)) == 0)
	return (&zpl_xattr_acl_access_handler);

	if (strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
	sizeof (XATTR_NAME_POSIX_ACL_DEFAULT)) == 0)
	return (&zpl_xattr_acl_default_handler);
	#endif /* CONFIG_FS_POSIX_ACL */

	return (NULL);
	}

	#if !defined(HAVE_POSIX_ACL_RELEASE) \|\| defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY)
	struct acl_rel_struct {
	struct acl_rel_struct *next;
	struct posix_acl *acl;
	clock_t time;
	};

	#define ACL_REL_GRACE (60*HZ)
	#define ACL_REL_WINDOW (1*HZ)
	#define ACL_REL_SCHED (ACL_REL_GRACE+ACL_REL_WINDOW)

	/*
	* Lockless multi-producer single-consumer fifo list.
	* Nodes are added to tail and removed from head. Tail pointer is our
	* synchronization point. It always points to the next pointer of the last
	* node, or head if list is empty.
	*/
	static struct acl_rel_struct *acl_rel_head = NULL;
	static struct acl_rel_struct **acl_rel_tail = &acl_rel_head;

	static void
	zpl_posix_acl_free(void *arg)
	{
	struct acl_rel_struct *freelist = NULL;
	struct acl_rel_struct *a;
	clock_t new_time;
	boolean_t refire = B_FALSE;

	ASSERT3P(acl_rel_head, !=, NULL);
	while (acl_rel_head) {
	a = acl_rel_head;
	if (ddi_get_lbolt() - a->time >= ACL_REL_GRACE) {
	/*
	* If a is the last node we need to reset tail, but we
	* need to use cmpxchg to make sure it is still the
	* last node.
	*/
	if (acl_rel_tail == &a->next) {
	acl_rel_head = NULL;
	if (cmpxchg(&acl_rel_tail, &a->next,
	&acl_rel_head) == &a->next) {
	ASSERT3P(a->next, ==, NULL);
	a->next = freelist;
	freelist = a;
	break;
	}
	}
	/*
	* a is not last node, make sure next pointer is set
	* by the adder and advance the head.
	*/
	while (READ_ONCE(a->next) == NULL)
	cpu_relax();
	acl_rel_head = a->next;
	a->next = freelist;
	freelist = a;
	} else {
	/*
	* a is still in grace period. We are responsible to
	* reschedule the free task, since adder will only do
	* so if list is empty.
	*/
	new_time = a->time + ACL_REL_SCHED;
	refire = B_TRUE;
	break;
	}
	}

	if (refire)
	taskq_dispatch_delay(system_delay_taskq, zpl_posix_acl_free,
	NULL, TQ_SLEEP, new_time);

	while (freelist) {
	a = freelist;
	freelist = a->next;
	kfree(a->acl);
	kmem_free(a, sizeof (struct acl_rel_struct));
	}
	}

	void
	zpl_posix_acl_release_impl(struct posix_acl *acl)
	{
	struct acl_rel_struct a, *prev;

	a = kmem_alloc(sizeof (struct acl_rel_struct), KM_SLEEP);
	a->next = NULL;
	a->acl = acl;
	a->time = ddi_get_lbolt();
	/* atomically points tail to us and get the previous tail */
	prev = xchg(&acl_rel_tail, &a->next);
	ASSERT3P(*prev, ==, NULL);
	*prev = a;
	/* if it was empty before, schedule the free task */
	if (prev == &acl_rel_head)
	taskq_dispatch_delay(system_delay_taskq, zpl_posix_acl_free,
	NULL, TQ_SLEEP, ddi_get_lbolt() + ACL_REL_SCHED);
	}
	#endif
	diff --git a/sys/contrib/openzfs/module/os/linux/zfs/zvol_os.c b/sys/contrib/openzfs/module/os/linux/zfs/zvol_os.c
	index 741979f11af8..c17423426319 100644
	--- a/sys/contrib/openzfs/module/os/linux/zfs/zvol_os.c
	+++ b/sys/contrib/openzfs/module/os/linux/zfs/zvol_os.c
	@@ -1,1146 +1,1174 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2012, 2020 by Delphix. All rights reserved.
	*/

	#include <sys/dataset_kstats.h>
	#include <sys/dbuf.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_dir.h>
	#include <sys/zap.h>
	#include <sys/zfeature.h>
	#include <sys/zil_impl.h>
	#include <sys/dmu_tx.h>
	#include <sys/zio.h>
	#include <sys/zfs_rlock.h>
	#include <sys/spa_impl.h>
	#include <sys/zvol.h>
	#include <sys/zvol_impl.h>

	#include <linux/blkdev_compat.h>
	#include <linux/task_io_accounting_ops.h>

	unsigned int zvol_major = ZVOL_MAJOR;
	unsigned int zvol_request_sync = 0;
	unsigned int zvol_prefetch_bytes = (128 * 1024);
	unsigned long zvol_max_discard_blocks = 16384;
	unsigned int zvol_threads = 32;

	struct zvol_state_os {
	struct gendisk zvo_disk; / generic disk */
	struct request_queue zvo_queue; / request queue */
	dev_t zvo_dev; /* device id */
	};

	taskq_t *zvol_taskq;
	static struct ida zvol_ida;

	typedef struct zv_request_stack {
	zvol_state_t *zv;
	struct bio *bio;
	} zv_request_t;

	typedef struct zv_request_task {
	zv_request_t zvr;
	taskq_ent_t ent;
	} zv_request_task_t;

	static zv_request_task_t *
	zv_request_task_create(zv_request_t zvr)
	{
	zv_request_task_t *task;
	task = kmem_alloc(sizeof (zv_request_task_t), KM_SLEEP);
	taskq_init_ent(&task->ent);
	task->zvr = zvr;
	return (task);
	}

	static void
	zv_request_task_free(zv_request_task_t *task)
	{
	kmem_free(task, sizeof (*task));
	}

	/*
	* Given a path, return TRUE if path is a ZVOL.
	*/
	static boolean_t
	zvol_is_zvol_impl(const char *path)
	{
	dev_t dev = 0;

	if (vdev_lookup_bdev(path, &dev) != 0)
	return (B_FALSE);

	if (MAJOR(dev) == zvol_major)
	return (B_TRUE);

	return (B_FALSE);
	}

	static void
	zvol_write(zv_request_t *zvr)
	{
	struct bio *bio = zvr->bio;
	int error = 0;
	zfs_uio_t uio;

	zfs_uio_bvec_init(&uio, bio);

	zvol_state_t *zv = zvr->zv;
	ASSERT3P(zv, !=, NULL);
	ASSERT3U(zv->zv_open_count, >, 0);
	ASSERT3P(zv->zv_zilog, !=, NULL);

	/* bio marked as FLUSH need to flush before write */
	if (bio_is_flush(bio))
	zil_commit(zv->zv_zilog, ZVOL_OBJ);

	/* Some requests are just for flush and nothing else. */
	if (uio.uio_resid == 0) {
	rw_exit(&zv->zv_suspend_lock);
	BIO_END_IO(bio, 0);
	return;
	}

	struct request_queue *q = zv->zv_zso->zvo_queue;
	struct gendisk *disk = zv->zv_zso->zvo_disk;
	ssize_t start_resid = uio.uio_resid;
	unsigned long start_time;

	boolean_t acct = blk_queue_io_stat(q);
	if (acct)
	start_time = blk_generic_start_io_acct(q, disk, WRITE, bio);

	boolean_t sync =
	bio_is_fua(bio) \|\| zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS;

	zfs_locked_range_t *lr = zfs_rangelock_enter(&zv->zv_rangelock,
	uio.uio_loffset, uio.uio_resid, RL_WRITER);

	uint64_t volsize = zv->zv_volsize;
	while (uio.uio_resid > 0 && uio.uio_loffset < volsize) {
	uint64_t bytes = MIN(uio.uio_resid, DMU_MAX_ACCESS >> 1);
	uint64_t off = uio.uio_loffset;
	dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);

	if (bytes > volsize - off) /* don't write past the end */
	bytes = volsize - off;

	dmu_tx_hold_write_by_dnode(tx, zv->zv_dn, off, bytes);

	/* This will only fail for ENOSPC */
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	break;
	}
	error = dmu_write_uio_dnode(zv->zv_dn, &uio, bytes, tx);
	if (error == 0) {
	zvol_log_write(zv, tx, off, bytes, sync);
	}
	dmu_tx_commit(tx);

	if (error)
	break;
	}
	zfs_rangelock_exit(lr);

	int64_t nwritten = start_resid - uio.uio_resid;
	dataset_kstats_update_write_kstats(&zv->zv_kstat, nwritten);
	task_io_account_write(nwritten);

	if (sync)
	zil_commit(zv->zv_zilog, ZVOL_OBJ);

	rw_exit(&zv->zv_suspend_lock);

	if (acct)
	blk_generic_end_io_acct(q, disk, WRITE, bio, start_time);

	BIO_END_IO(bio, -error);
	}

	static void
	zvol_write_task(void *arg)
	{
	zv_request_task_t *task = arg;
	zvol_write(&task->zvr);
	zv_request_task_free(task);
	}

	static void
	zvol_discard(zv_request_t *zvr)
	{
	struct bio *bio = zvr->bio;
	zvol_state_t *zv = zvr->zv;
	uint64_t start = BIO_BI_SECTOR(bio) << 9;
	uint64_t size = BIO_BI_SIZE(bio);
	uint64_t end = start + size;
	boolean_t sync;
	int error = 0;
	dmu_tx_t *tx;

	ASSERT3P(zv, !=, NULL);
	ASSERT3U(zv->zv_open_count, >, 0);
	ASSERT3P(zv->zv_zilog, !=, NULL);

	struct request_queue *q = zv->zv_zso->zvo_queue;
	struct gendisk *disk = zv->zv_zso->zvo_disk;
	unsigned long start_time;

	boolean_t acct = blk_queue_io_stat(q);
	if (acct)
	start_time = blk_generic_start_io_acct(q, disk, WRITE, bio);

	sync = bio_is_fua(bio) \|\| zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS;

	if (end > zv->zv_volsize) {
	error = SET_ERROR(EIO);
	goto unlock;
	}

	/*
	* Align the request to volume block boundaries when a secure erase is
	* not required. This will prevent dnode_free_range() from zeroing out
	* the unaligned parts which is slow (read-modify-write) and useless
	* since we are not freeing any space by doing so.
	*/
	if (!bio_is_secure_erase(bio)) {
	start = P2ROUNDUP(start, zv->zv_volblocksize);
	end = P2ALIGN(end, zv->zv_volblocksize);
	size = end - start;
	}

	if (start >= end)
	goto unlock;

	zfs_locked_range_t *lr = zfs_rangelock_enter(&zv->zv_rangelock,
	start, size, RL_WRITER);

	tx = dmu_tx_create(zv->zv_objset);
	dmu_tx_mark_netfree(tx);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error != 0) {
	dmu_tx_abort(tx);
	} else {
	zvol_log_truncate(zv, tx, start, size, B_TRUE);
	dmu_tx_commit(tx);
	error = dmu_free_long_range(zv->zv_objset,
	ZVOL_OBJ, start, size);
	}
	zfs_rangelock_exit(lr);

	if (error == 0 && sync)
	zil_commit(zv->zv_zilog, ZVOL_OBJ);

	unlock:
	rw_exit(&zv->zv_suspend_lock);

	if (acct)
	blk_generic_end_io_acct(q, disk, WRITE, bio, start_time);

	BIO_END_IO(bio, -error);
	}

	static void
	zvol_discard_task(void *arg)
	{
	zv_request_task_t *task = arg;
	zvol_discard(&task->zvr);
	zv_request_task_free(task);
	}

	static void
	zvol_read(zv_request_t *zvr)
	{
	struct bio *bio = zvr->bio;
	int error = 0;
	zfs_uio_t uio;

	zfs_uio_bvec_init(&uio, bio);

	zvol_state_t *zv = zvr->zv;
	ASSERT3P(zv, !=, NULL);
	ASSERT3U(zv->zv_open_count, >, 0);

	struct request_queue *q = zv->zv_zso->zvo_queue;
	struct gendisk *disk = zv->zv_zso->zvo_disk;
	ssize_t start_resid = uio.uio_resid;
	unsigned long start_time;

	boolean_t acct = blk_queue_io_stat(q);
	if (acct)
	start_time = blk_generic_start_io_acct(q, disk, READ, bio);

	zfs_locked_range_t *lr = zfs_rangelock_enter(&zv->zv_rangelock,
	uio.uio_loffset, uio.uio_resid, RL_READER);

	uint64_t volsize = zv->zv_volsize;
	while (uio.uio_resid > 0 && uio.uio_loffset < volsize) {
	uint64_t bytes = MIN(uio.uio_resid, DMU_MAX_ACCESS >> 1);

	/* don't read past the end */
	if (bytes > volsize - uio.uio_loffset)
	bytes = volsize - uio.uio_loffset;

	error = dmu_read_uio_dnode(zv->zv_dn, &uio, bytes);
	if (error) {
	/* convert checksum errors into IO errors */
	if (error == ECKSUM)
	error = SET_ERROR(EIO);
	break;
	}
	}
	zfs_rangelock_exit(lr);

	int64_t nread = start_resid - uio.uio_resid;
	dataset_kstats_update_read_kstats(&zv->zv_kstat, nread);
	task_io_account_read(nread);

	rw_exit(&zv->zv_suspend_lock);

	if (acct)
	blk_generic_end_io_acct(q, disk, READ, bio, start_time);

	BIO_END_IO(bio, -error);
	}

	static void
	zvol_read_task(void *arg)
	{
	zv_request_task_t *task = arg;
	zvol_read(&task->zvr);
	zv_request_task_free(task);
	}

	#ifdef HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS
	static blk_qc_t
	zvol_submit_bio(struct bio *bio)
	#else
	static MAKE_REQUEST_FN_RET
	zvol_request(struct request_queue q, struct bio bio)
	#endif
	{
	#ifdef HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS
	#if defined(HAVE_BIO_BDEV_DISK)
	struct request_queue *q = bio->bi_bdev->bd_disk->queue;
	#else
	struct request_queue *q = bio->bi_disk->queue;
	#endif
	#endif
	zvol_state_t *zv = q->queuedata;
	fstrans_cookie_t cookie = spl_fstrans_mark();
	uint64_t offset = BIO_BI_SECTOR(bio) << 9;
	uint64_t size = BIO_BI_SIZE(bio);
	int rw = bio_data_dir(bio);

	if (bio_has_data(bio) && offset + size > zv->zv_volsize) {
	printk(KERN_INFO
	"%s: bad access: offset=%llu, size=%lu\n",
	zv->zv_zso->zvo_disk->disk_name,
	(long long unsigned)offset,
	(long unsigned)size);

	BIO_END_IO(bio, -SET_ERROR(EIO));
	goto out;
	}

	zv_request_t zvr = {
	.zv = zv,
	.bio = bio,
	};
	zv_request_task_t *task;

	if (rw == WRITE) {
	if (unlikely(zv->zv_flags & ZVOL_RDONLY)) {
	BIO_END_IO(bio, -SET_ERROR(EROFS));
	goto out;
	}

	/*
	* Prevents the zvol from being suspended, or the ZIL being
	* concurrently opened. Will be released after the i/o
	* completes.
	*/
	rw_enter(&zv->zv_suspend_lock, RW_READER);

	/*
	* Open a ZIL if this is the first time we have written to this
	* zvol. We protect zv->zv_zilog with zv_suspend_lock rather
	* than zv_state_lock so that we don't need to acquire an
	* additional lock in this path.
	*/
	if (zv->zv_zilog == NULL) {
	rw_exit(&zv->zv_suspend_lock);
	rw_enter(&zv->zv_suspend_lock, RW_WRITER);
	if (zv->zv_zilog == NULL) {
	zv->zv_zilog = zil_open(zv->zv_objset,
	zvol_get_data);
	zv->zv_flags \|= ZVOL_WRITTEN_TO;
	/* replay / destroy done in zvol_create_minor */
	VERIFY0((zv->zv_zilog->zl_header->zh_flags &
	ZIL_REPLAY_NEEDED));
	}
	rw_downgrade(&zv->zv_suspend_lock);
	}

	/*
	* We don't want this thread to be blocked waiting for i/o to
	* complete, so we instead wait from a taskq callback. The
	* i/o may be a ZIL write (via zil_commit()), or a read of an
	* indirect block, or a read of a data block (if this is a
	* partial-block write). We will indicate that the i/o is
	* complete by calling BIO_END_IO() from the taskq callback.
	*
	* This design allows the calling thread to continue and
	* initiate more concurrent operations by calling
	* zvol_request() again. There are typically only a small
	* number of threads available to call zvol_request() (e.g.
	* one per iSCSI target), so keeping the latency of
	* zvol_request() low is important for performance.
	*
	* The zvol_request_sync module parameter allows this
	* behavior to be altered, for performance evaluation
	* purposes. If the callback blocks, setting
	* zvol_request_sync=1 will result in much worse performance.
	*
	* We can have up to zvol_threads concurrent i/o's being
	* processed for all zvols on the system. This is typically
	* a vast improvement over the zvol_request_sync=1 behavior
	* of one i/o at a time per zvol. However, an even better
	* design would be for zvol_request() to initiate the zio
	* directly, and then be notified by the zio_done callback,
	* which would call BIO_END_IO(). Unfortunately, the DMU/ZIL
	* interfaces lack this functionality (they block waiting for
	* the i/o to complete).
	*/
	if (bio_is_discard(bio) \|\| bio_is_secure_erase(bio)) {
	if (zvol_request_sync) {
	zvol_discard(&zvr);
	} else {
	task = zv_request_task_create(zvr);
	taskq_dispatch_ent(zvol_taskq,
	zvol_discard_task, task, 0, &task->ent);
	}
	} else {
	if (zvol_request_sync) {
	zvol_write(&zvr);
	} else {
	task = zv_request_task_create(zvr);
	taskq_dispatch_ent(zvol_taskq,
	zvol_write_task, task, 0, &task->ent);
	}
	}
	} else {
	/*
	* The SCST driver, and possibly others, may issue READ I/Os
	* with a length of zero bytes. These empty I/Os contain no
	* data and require no additional handling.
	*/
	if (size == 0) {
	BIO_END_IO(bio, 0);
	goto out;
	}

	rw_enter(&zv->zv_suspend_lock, RW_READER);

	/* See comment in WRITE case above. */
	if (zvol_request_sync) {
	zvol_read(&zvr);
	} else {
	task = zv_request_task_create(zvr);
	taskq_dispatch_ent(zvol_taskq,
	zvol_read_task, task, 0, &task->ent);
	}
	}

	out:
	spl_fstrans_unmark(cookie);
	#if defined(HAVE_MAKE_REQUEST_FN_RET_QC) \|\| \
	defined(HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS)
	return (BLK_QC_T_NONE);
	#endif
	}

	static int
	zvol_open(struct block_device *bdev, fmode_t flag)
	{
	zvol_state_t *zv;
	int error = 0;
	boolean_t drop_suspend = B_TRUE;

	rw_enter(&zvol_state_lock, RW_READER);
	/*
	* Obtain a copy of private_data under the zvol_state_lock to make
	* sure that either the result of zvol free code path setting
	* bdev->bd_disk->private_data to NULL is observed, or zvol_free()
	* is not called on this zv because of the positive zv_open_count.
	*/
	zv = bdev->bd_disk->private_data;
	if (zv == NULL) {
	rw_exit(&zvol_state_lock);
	return (SET_ERROR(-ENXIO));
	}

	mutex_enter(&zv->zv_state_lock);
	/*
	* make sure zvol is not suspended during first open
	* (hold zv_suspend_lock) and respect proper lock acquisition
	* ordering - zv_suspend_lock before zv_state_lock
	*/
	if (zv->zv_open_count == 0) {
	if (!rw_tryenter(&zv->zv_suspend_lock, RW_READER)) {
	mutex_exit(&zv->zv_state_lock);
	rw_enter(&zv->zv_suspend_lock, RW_READER);
	mutex_enter(&zv->zv_state_lock);
	/* check to see if zv_suspend_lock is needed */
	if (zv->zv_open_count != 0) {
	rw_exit(&zv->zv_suspend_lock);
	drop_suspend = B_FALSE;
	}
	}
	} else {
	drop_suspend = B_FALSE;
	}
	rw_exit(&zvol_state_lock);

	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	if (zv->zv_open_count == 0) {
	ASSERT(RW_READ_HELD(&zv->zv_suspend_lock));
	error = -zvol_first_open(zv, !(flag & FMODE_WRITE));
	if (error)
	goto out_mutex;
	}

	if ((flag & FMODE_WRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
	error = -EROFS;
	goto out_open_count;
	}

	zv->zv_open_count++;

	mutex_exit(&zv->zv_state_lock);
	if (drop_suspend)
	rw_exit(&zv->zv_suspend_lock);

	zfs_check_media_change(bdev);

	return (0);

	out_open_count:
	if (zv->zv_open_count == 0)
	zvol_last_close(zv);

	out_mutex:
	mutex_exit(&zv->zv_state_lock);
	if (drop_suspend)
	rw_exit(&zv->zv_suspend_lock);
	if (error == -EINTR) {
	error = -ERESTARTSYS;
	schedule();
	}
	return (SET_ERROR(error));
	}

	static void
	zvol_release(struct gendisk *disk, fmode_t mode)
	{
	zvol_state_t *zv;
	boolean_t drop_suspend = B_TRUE;

	rw_enter(&zvol_state_lock, RW_READER);
	zv = disk->private_data;

	mutex_enter(&zv->zv_state_lock);
	ASSERT3U(zv->zv_open_count, >, 0);
	/*
	* make sure zvol is not suspended during last close
	* (hold zv_suspend_lock) and respect proper lock acquisition
	* ordering - zv_suspend_lock before zv_state_lock
	*/
	if (zv->zv_open_count == 1) {
	if (!rw_tryenter(&zv->zv_suspend_lock, RW_READER)) {
	mutex_exit(&zv->zv_state_lock);
	rw_enter(&zv->zv_suspend_lock, RW_READER);
	mutex_enter(&zv->zv_state_lock);
	/* check to see if zv_suspend_lock is needed */
	if (zv->zv_open_count != 1) {
	rw_exit(&zv->zv_suspend_lock);
	drop_suspend = B_FALSE;
	}
	}
	} else {
	drop_suspend = B_FALSE;
	}
	rw_exit(&zvol_state_lock);

	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	zv->zv_open_count--;
	if (zv->zv_open_count == 0) {
	ASSERT(RW_READ_HELD(&zv->zv_suspend_lock));
	zvol_last_close(zv);
	}

	mutex_exit(&zv->zv_state_lock);

	if (drop_suspend)
	rw_exit(&zv->zv_suspend_lock);
	}

	static int
	zvol_ioctl(struct block_device *bdev, fmode_t mode,
	unsigned int cmd, unsigned long arg)
	{
	zvol_state_t *zv = bdev->bd_disk->private_data;
	int error = 0;

	ASSERT3U(zv->zv_open_count, >, 0);

	switch (cmd) {
	case BLKFLSBUF:
	fsync_bdev(bdev);
	invalidate_bdev(bdev);
	rw_enter(&zv->zv_suspend_lock, RW_READER);

	if (!(zv->zv_flags & ZVOL_RDONLY))
	txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);

	rw_exit(&zv->zv_suspend_lock);
	break;

	case BLKZNAME:
	mutex_enter(&zv->zv_state_lock);
	error = copy_to_user((void *)arg, zv->zv_name, MAXNAMELEN);
	mutex_exit(&zv->zv_state_lock);
	break;

	default:
	error = -ENOTTY;
	break;
	}

	return (SET_ERROR(error));
	}

	#ifdef CONFIG_COMPAT
	static int
	zvol_compat_ioctl(struct block_device *bdev, fmode_t mode,
	unsigned cmd, unsigned long arg)
	{
	return (zvol_ioctl(bdev, mode, cmd, arg));
	}
	#else
	#define zvol_compat_ioctl NULL
	#endif

	static unsigned int
	zvol_check_events(struct gendisk *disk, unsigned int clearing)
	{
	unsigned int mask = 0;

	rw_enter(&zvol_state_lock, RW_READER);

	zvol_state_t *zv = disk->private_data;
	if (zv != NULL) {
	mutex_enter(&zv->zv_state_lock);
	mask = zv->zv_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
	zv->zv_changed = 0;
	mutex_exit(&zv->zv_state_lock);
	}

	rw_exit(&zvol_state_lock);

	return (mask);
	}

	static int
	zvol_revalidate_disk(struct gendisk *disk)
	{
	rw_enter(&zvol_state_lock, RW_READER);

	zvol_state_t *zv = disk->private_data;
	if (zv != NULL) {
	mutex_enter(&zv->zv_state_lock);
	set_capacity(zv->zv_zso->zvo_disk,
	zv->zv_volsize >> SECTOR_BITS);
	mutex_exit(&zv->zv_state_lock);
	}

	rw_exit(&zvol_state_lock);

	return (0);
	}

	static int
	zvol_update_volsize(zvol_state_t *zv, uint64_t volsize)
	{
	struct gendisk *disk = zv->zv_zso->zvo_disk;

	#if defined(HAVE_REVALIDATE_DISK_SIZE)
	revalidate_disk_size(disk, zvol_revalidate_disk(disk) == 0);
	#elif defined(HAVE_REVALIDATE_DISK)
	revalidate_disk(disk);
	#else
	zvol_revalidate_disk(disk);
	#endif
	return (0);
	}

	static void
	zvol_clear_private(zvol_state_t *zv)
	{
	/*
	* Cleared while holding zvol_state_lock as a writer
	* which will prevent zvol_open() from opening it.
	*/
	zv->zv_zso->zvo_disk->private_data = NULL;
	}

	/*
	* Provide a simple virtual geometry for legacy compatibility. For devices
	* smaller than 1 MiB a small head and sector count is used to allow very
	* tiny devices. For devices over 1 Mib a standard head and sector count
	* is used to keep the cylinders count reasonable.
	*/
	static int
	zvol_getgeo(struct block_device bdev, struct hd_geometry geo)
	{
	zvol_state_t *zv = bdev->bd_disk->private_data;
	sector_t sectors;

	ASSERT3U(zv->zv_open_count, >, 0);

	sectors = get_capacity(zv->zv_zso->zvo_disk);

	if (sectors > 2048) {
	geo->heads = 16;
	geo->sectors = 63;
	} else {
	geo->heads = 2;
	geo->sectors = 4;
	}

	geo->start = 0;
	geo->cylinders = sectors / (geo->heads * geo->sectors);

	return (0);
	}

	static struct block_device_operations zvol_ops = {
	.open = zvol_open,
	.release = zvol_release,
	.ioctl = zvol_ioctl,
	.compat_ioctl = zvol_compat_ioctl,
	.check_events = zvol_check_events,
	#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
	.revalidate_disk = zvol_revalidate_disk,
	#endif
	.getgeo = zvol_getgeo,
	.owner = THIS_MODULE,
	#ifdef HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS
	- .submit_bio = zvol_submit_bio,
	+ .submit_bio = zvol_submit_bio,
	#endif
	};

	/*
	* Allocate memory for a new zvol_state_t and setup the required
	* request queue and generic disk structures for the block device.
	*/
	static zvol_state_t *
	zvol_alloc(dev_t dev, const char *name)
	{
	zvol_state_t *zv;
	struct zvol_state_os *zso;
	uint64_t volmode;

	if (dsl_prop_get_integer(name, "volmode", &volmode, NULL) != 0)
	return (NULL);

	if (volmode == ZFS_VOLMODE_DEFAULT)
	volmode = zvol_volmode;

	if (volmode == ZFS_VOLMODE_NONE)
	return (NULL);

	zv = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
	zso = kmem_zalloc(sizeof (struct zvol_state_os), KM_SLEEP);
	zv->zv_zso = zso;
	zv->zv_volmode = volmode;

	list_link_init(&zv->zv_next);
	mutex_init(&zv->zv_state_lock, NULL, MUTEX_DEFAULT, NULL);

	#ifdef HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS
	+#ifdef HAVE_BLK_ALLOC_DISK
	+ zso->zvo_disk = blk_alloc_disk(NUMA_NO_NODE);
	+ if (zso->zvo_disk == NULL)
	+ goto out_kmem;
	+
	+ zso->zvo_disk->minors = ZVOL_MINORS;
	+ zso->zvo_queue = zso->zvo_disk->queue;
	+#else
	zso->zvo_queue = blk_alloc_queue(NUMA_NO_NODE);
	+ if (zso->zvo_queue == NULL)
	+ goto out_kmem;
	+
	+ zso->zvo_disk = alloc_disk(ZVOL_MINORS);
	+ if (zso->zvo_disk == NULL) {
	+ blk_cleanup_queue(zso->zvo_queue);
	+ goto out_kmem;
	+ }
	+
	+ zso->zvo_disk->queue = zso->zvo_queue;
	+#endif /* HAVE_BLK_ALLOC_DISK */
	#else
	zso->zvo_queue = blk_generic_alloc_queue(zvol_request, NUMA_NO_NODE);
	-#endif
	if (zso->zvo_queue == NULL)
	goto out_kmem;

	+ zso->zvo_disk = alloc_disk(ZVOL_MINORS);
	+ if (zso->zvo_disk == NULL) {
	+ blk_cleanup_queue(zso->zvo_queue);
	+ goto out_kmem;
	+ }
	+
	+ zso->zvo_disk->queue = zso->zvo_queue;
	+#endif /* HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS */
	+
	blk_queue_set_write_cache(zso->zvo_queue, B_TRUE, B_TRUE);

	/* Limit read-ahead to a single page to prevent over-prefetching. */
	blk_queue_set_read_ahead(zso->zvo_queue, 1);

	/* Disable write merging in favor of the ZIO pipeline. */
	blk_queue_flag_set(QUEUE_FLAG_NOMERGES, zso->zvo_queue);

	- zso->zvo_disk = alloc_disk(ZVOL_MINORS);
	- if (zso->zvo_disk == NULL)
	- goto out_queue;
	+ /* Enable /proc/diskstats */
	+ blk_queue_flag_set(QUEUE_FLAG_IO_STAT, zso->zvo_queue);

	zso->zvo_queue->queuedata = zv;
	zso->zvo_dev = dev;
	zv->zv_open_count = 0;
	strlcpy(zv->zv_name, name, MAXNAMELEN);

	zfs_rangelock_init(&zv->zv_rangelock, NULL, NULL);
	rw_init(&zv->zv_suspend_lock, NULL, RW_DEFAULT, NULL);

	zso->zvo_disk->major = zvol_major;
	zso->zvo_disk->events = DISK_EVENT_MEDIA_CHANGE;

	if (volmode == ZFS_VOLMODE_DEV) {
	/*
	* ZFS_VOLMODE_DEV disable partitioning on ZVOL devices: set
	* gendisk->minors = 1 as noted in include/linux/genhd.h.
	* Also disable extended partition numbers (GENHD_FL_EXT_DEVT)
	* and suppresses partition scanning (GENHD_FL_NO_PART_SCAN)
	* setting gendisk->flags accordingly.
	*/
	zso->zvo_disk->minors = 1;
	#if defined(GENHD_FL_EXT_DEVT)
	zso->zvo_disk->flags &= ~GENHD_FL_EXT_DEVT;
	#endif
	#if defined(GENHD_FL_NO_PART_SCAN)
	zso->zvo_disk->flags \|= GENHD_FL_NO_PART_SCAN;
	#endif
	}
	zso->zvo_disk->first_minor = (dev & MINORMASK);
	zso->zvo_disk->fops = &zvol_ops;
	zso->zvo_disk->private_data = zv;
	- zso->zvo_disk->queue = zso->zvo_queue;
	snprintf(zso->zvo_disk->disk_name, DISK_NAME_LEN, "%s%d",
	ZVOL_DEV_NAME, (dev & MINORMASK));

	return (zv);

	-out_queue:
	- blk_cleanup_queue(zso->zvo_queue);
	out_kmem:
	kmem_free(zso, sizeof (struct zvol_state_os));
	kmem_free(zv, sizeof (zvol_state_t));
	return (NULL);
	}

	/*
	* Cleanup then free a zvol_state_t which was created by zvol_alloc().
	* At this time, the structure is not opened by anyone, is taken off
	* the zvol_state_list, and has its private data set to NULL.
	* The zvol_state_lock is dropped.
	*
	* This function may take many milliseconds to complete (e.g. we've seen
	* it take over 256ms), due to the calls to "blk_cleanup_queue" and
	* "del_gendisk". Thus, consumers need to be careful to account for this
	* latency when calling this function.
	*/
	static void
	zvol_free(zvol_state_t *zv)
	{

	ASSERT(!RW_LOCK_HELD(&zv->zv_suspend_lock));
	ASSERT(!MUTEX_HELD(&zv->zv_state_lock));
	ASSERT0(zv->zv_open_count);
	ASSERT3P(zv->zv_zso->zvo_disk->private_data, ==, NULL);

	rw_destroy(&zv->zv_suspend_lock);
	zfs_rangelock_fini(&zv->zv_rangelock);

	del_gendisk(zv->zv_zso->zvo_disk);
	+#if defined(HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS) && \
	+ defined(HAVE_BLK_ALLOC_DISK)
	+ blk_cleanup_disk(zv->zv_zso->zvo_disk);
	+#else
	blk_cleanup_queue(zv->zv_zso->zvo_queue);
	put_disk(zv->zv_zso->zvo_disk);
	+#endif

	ida_simple_remove(&zvol_ida,
	MINOR(zv->zv_zso->zvo_dev) >> ZVOL_MINOR_BITS);

	mutex_destroy(&zv->zv_state_lock);
	dataset_kstats_destroy(&zv->zv_kstat);

	kmem_free(zv->zv_zso, sizeof (struct zvol_state_os));
	kmem_free(zv, sizeof (zvol_state_t));
	}

	void
	zvol_wait_close(zvol_state_t *zv)
	{
	}

	/*
	* Create a block device minor node and setup the linkage between it
	* and the specified volume. Once this function returns the block
	* device is live and ready for use.
	*/
	static int
	zvol_os_create_minor(const char *name)
	{
	zvol_state_t *zv;
	objset_t *os;
	dmu_object_info_t *doi;
	uint64_t volsize;
	uint64_t len;
	unsigned minor = 0;
	int error = 0;
	int idx;
	uint64_t hash = zvol_name_hash(name);

	if (zvol_inhibit_dev)
	return (0);

	idx = ida_simple_get(&zvol_ida, 0, 0, kmem_flags_convert(KM_SLEEP));
	if (idx < 0)
	return (SET_ERROR(-idx));
	minor = idx << ZVOL_MINOR_BITS;

	zv = zvol_find_by_name_hash(name, hash, RW_NONE);
	if (zv) {
	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
	mutex_exit(&zv->zv_state_lock);
	ida_simple_remove(&zvol_ida, idx);
	return (SET_ERROR(EEXIST));
	}

	doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP);

	error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, B_TRUE, FTAG, &os);
	if (error)
	goto out_doi;

	error = dmu_object_info(os, ZVOL_OBJ, doi);
	if (error)
	goto out_dmu_objset_disown;

	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
	if (error)
	goto out_dmu_objset_disown;

	zv = zvol_alloc(MKDEV(zvol_major, minor), name);
	if (zv == NULL) {
	error = SET_ERROR(EAGAIN);
	goto out_dmu_objset_disown;
	}
	zv->zv_hash = hash;

	if (dmu_objset_is_snapshot(os))
	zv->zv_flags \|= ZVOL_RDONLY;

	zv->zv_volblocksize = doi->doi_data_block_size;
	zv->zv_volsize = volsize;
	zv->zv_objset = os;

	set_capacity(zv->zv_zso->zvo_disk, zv->zv_volsize >> 9);

	blk_queue_max_hw_sectors(zv->zv_zso->zvo_queue,
	(DMU_MAX_ACCESS / 4) >> 9);
	blk_queue_max_segments(zv->zv_zso->zvo_queue, UINT16_MAX);
	blk_queue_max_segment_size(zv->zv_zso->zvo_queue, UINT_MAX);
	blk_queue_physical_block_size(zv->zv_zso->zvo_queue,
	zv->zv_volblocksize);
	blk_queue_io_opt(zv->zv_zso->zvo_queue, zv->zv_volblocksize);
	blk_queue_max_discard_sectors(zv->zv_zso->zvo_queue,
	(zvol_max_discard_blocks * zv->zv_volblocksize) >> 9);
	blk_queue_discard_granularity(zv->zv_zso->zvo_queue,
	zv->zv_volblocksize);
	blk_queue_flag_set(QUEUE_FLAG_DISCARD, zv->zv_zso->zvo_queue);
	#ifdef QUEUE_FLAG_NONROT
	blk_queue_flag_set(QUEUE_FLAG_NONROT, zv->zv_zso->zvo_queue);
	#endif
	#ifdef QUEUE_FLAG_ADD_RANDOM
	blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, zv->zv_zso->zvo_queue);
	#endif
	/* This flag was introduced in kernel version 4.12. */
	#ifdef QUEUE_FLAG_SCSI_PASSTHROUGH
	blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, zv->zv_zso->zvo_queue);
	#endif

	ASSERT3P(zv->zv_zilog, ==, NULL);
	zv->zv_zilog = zil_open(os, zvol_get_data);
	if (spa_writeable(dmu_objset_spa(os))) {
	if (zil_replay_disable)
	zil_destroy(zv->zv_zilog, B_FALSE);
	else
	zil_replay(os, zv, zvol_replay_vector);
	}
	zil_close(zv->zv_zilog);
	zv->zv_zilog = NULL;
	ASSERT3P(zv->zv_kstat.dk_kstats, ==, NULL);
	dataset_kstats_create(&zv->zv_kstat, zv->zv_objset);

	/*
	* When udev detects the addition of the device it will immediately
	* invoke blkid(8) to determine the type of content on the device.
	* Prefetching the blocks commonly scanned by blkid(8) will speed
	* up this process.
	*/
	len = MIN(MAX(zvol_prefetch_bytes, 0), SPA_MAXBLOCKSIZE);
	if (len > 0) {
	dmu_prefetch(os, ZVOL_OBJ, 0, 0, len, ZIO_PRIORITY_SYNC_READ);
	dmu_prefetch(os, ZVOL_OBJ, 0, volsize - len, len,
	ZIO_PRIORITY_SYNC_READ);
	}

	zv->zv_objset = NULL;
	out_dmu_objset_disown:
	dmu_objset_disown(os, B_TRUE, FTAG);
	out_doi:
	kmem_free(doi, sizeof (dmu_object_info_t));

	/*
	* Keep in mind that once add_disk() is called, the zvol is
	* announced to the world, and zvol_open()/zvol_release() can
	* be called at any time. Incidentally, add_disk() itself calls
	* zvol_open()->zvol_first_open() and zvol_release()->zvol_last_close()
	* directly as well.
	*/
	if (error == 0) {
	rw_enter(&zvol_state_lock, RW_WRITER);
	zvol_insert(zv);
	rw_exit(&zvol_state_lock);
	add_disk(zv->zv_zso->zvo_disk);
	} else {
	ida_simple_remove(&zvol_ida, idx);
	}

	return (error);
	}

	static void
	zvol_rename_minor(zvol_state_t zv, const char newname)
	{
	int readonly = get_disk_ro(zv->zv_zso->zvo_disk);

	ASSERT(RW_LOCK_HELD(&zvol_state_lock));
	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	strlcpy(zv->zv_name, newname, sizeof (zv->zv_name));

	/* move to new hashtable entry */
	zv->zv_hash = zvol_name_hash(zv->zv_name);
	hlist_del(&zv->zv_hlink);
	hlist_add_head(&zv->zv_hlink, ZVOL_HT_HEAD(zv->zv_hash));

	/*
	* The block device's read-only state is briefly changed causing
	* a KOBJ_CHANGE uevent to be issued. This ensures udev detects
	* the name change and fixes the symlinks. This does not change
	* ZVOL_RDONLY in zv->zv_flags so the actual read-only state never
	* changes. This would normally be done using kobject_uevent() but
	* that is a GPL-only symbol which is why we need this workaround.
	*/
	set_disk_ro(zv->zv_zso->zvo_disk, !readonly);
	set_disk_ro(zv->zv_zso->zvo_disk, readonly);
	}

	static void
	zvol_set_disk_ro_impl(zvol_state_t *zv, int flags)
	{

	set_disk_ro(zv->zv_zso->zvo_disk, flags);
	}

	static void
	zvol_set_capacity_impl(zvol_state_t *zv, uint64_t capacity)
	{

	set_capacity(zv->zv_zso->zvo_disk, capacity);
	}

	const static zvol_platform_ops_t zvol_linux_ops = {
	.zv_free = zvol_free,
	.zv_rename_minor = zvol_rename_minor,
	.zv_create_minor = zvol_os_create_minor,
	.zv_update_volsize = zvol_update_volsize,
	.zv_clear_private = zvol_clear_private,
	.zv_is_zvol = zvol_is_zvol_impl,
	.zv_set_disk_ro = zvol_set_disk_ro_impl,
	.zv_set_capacity = zvol_set_capacity_impl,
	};

	int
	zvol_init(void)
	{
	int error;
	int threads = MIN(MAX(zvol_threads, 1), 1024);

	error = register_blkdev(zvol_major, ZVOL_DRIVER);
	if (error) {
	printk(KERN_INFO "ZFS: register_blkdev() failed %d\n", error);
	return (error);
	}
	zvol_taskq = taskq_create(ZVOL_DRIVER, threads, maxclsyspri,
	threads * 2, INT_MAX, TASKQ_PREPOPULATE \| TASKQ_DYNAMIC);
	if (zvol_taskq == NULL) {
	unregister_blkdev(zvol_major, ZVOL_DRIVER);
	return (-ENOMEM);
	}
	zvol_init_impl();
	ida_init(&zvol_ida);
	zvol_register_ops(&zvol_linux_ops);
	return (0);
	}

	void
	zvol_fini(void)
	{
	zvol_fini_impl();
	unregister_blkdev(zvol_major, ZVOL_DRIVER);
	taskq_destroy(zvol_taskq);
	ida_destroy(&zvol_ida);
	}

	/* BEGIN CSTYLED */
	module_param(zvol_inhibit_dev, uint, 0644);
	MODULE_PARM_DESC(zvol_inhibit_dev, "Do not create zvol device nodes");

	module_param(zvol_major, uint, 0444);
	MODULE_PARM_DESC(zvol_major, "Major number for zvol device");

	module_param(zvol_threads, uint, 0444);
	MODULE_PARM_DESC(zvol_threads, "Max number of threads to handle I/O requests");

	module_param(zvol_request_sync, uint, 0644);
	MODULE_PARM_DESC(zvol_request_sync, "Synchronously handle bio requests");

	module_param(zvol_max_discard_blocks, ulong, 0444);
	MODULE_PARM_DESC(zvol_max_discard_blocks, "Max number of blocks to discard");

	module_param(zvol_prefetch_bytes, uint, 0644);
	MODULE_PARM_DESC(zvol_prefetch_bytes, "Prefetch N bytes at zvol start+end");

	module_param(zvol_volmode, uint, 0644);
	MODULE_PARM_DESC(zvol_volmode, "Default volmode property value");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/abd.c b/sys/contrib/openzfs/module/zfs/abd.c
	index d5fafccd08af..cc2d3575db63 100644
	--- a/sys/contrib/openzfs/module/zfs/abd.c
	+++ b/sys/contrib/openzfs/module/zfs/abd.c
	@@ -1,1216 +1,1216 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
	* Copyright (c) 2019 by Delphix. All rights reserved.
	*/

	/*
	* ARC buffer data (ABD).
	*
	* ABDs are an abstract data structure for the ARC which can use two
	* different ways of storing the underlying data:
	*
	* (a) Linear buffer. In this case, all the data in the ABD is stored in one
	* contiguous buffer in memory (from a zio_[data_]buf_* kmem cache).
	*
	* +-------------------+
	* \| ABD (linear) \|
	* \| abd_flags = ... \|
	* \| abd_size = ... \| +--------------------------------+
	* \| abd_buf ------------->\| raw buffer of size abd_size \|
	* +-------------------+ +--------------------------------+
	* no abd_chunks
	*
	* (b) Scattered buffer. In this case, the data in the ABD is split into
	* equal-sized chunks (from the abd_chunk_cache kmem_cache), with pointers
	* to the chunks recorded in an array at the end of the ABD structure.
	*
	* +-------------------+
	* \| ABD (scattered) \|
	* \| abd_flags = ... \|
	* \| abd_size = ... \|
	* \| abd_offset = 0 \| +-----------+
	* \| abd_chunks[0] ----------------------------->\| chunk 0 \|
	* \| abd_chunks[1] ---------------------+ +-----------+
	* \| ... \| \| +-----------+
	* \| abd_chunks[N-1] ---------+ +------->\| chunk 1 \|
	* +-------------------+ \| +-----------+
	* \| ...
	* \| +-----------+
	* +----------------->\| chunk N-1 \|
	* +-----------+
	*
	* In addition to directly allocating a linear or scattered ABD, it is also
	* possible to create an ABD by requesting the "sub-ABD" starting at an offset
	* within an existing ABD. In linear buffers this is simple (set abd_buf of
	* the new ABD to the starting point within the original raw buffer), but
	* scattered ABDs are a little more complex. The new ABD makes a copy of the
	* relevant abd_chunks pointers (but not the underlying data). However, to
	* provide arbitrary rather than only chunk-aligned starting offsets, it also
	* tracks an abd_offset field which represents the starting point of the data
	* within the first chunk in abd_chunks. For both linear and scattered ABDs,
	* creating an offset ABD marks the original ABD as the offset's parent, and the
	* original ABD's abd_children refcount is incremented. This data allows us to
	* ensure the root ABD isn't deleted before its children.
	*
	* Most consumers should never need to know what type of ABD they're using --
	* the ABD public API ensures that it's possible to transparently switch from
	* using a linear ABD to a scattered one when doing so would be beneficial.
	*
	* If you need to use the data within an ABD directly, if you know it's linear
	* (because you allocated it) you can use abd_to_buf() to access the underlying
	* raw buffer. Otherwise, you should use one of the abd_borrow_buf* functions
	* which will allocate a raw buffer if necessary. Use the abd_return_buf*
	* functions to return any raw buffers that are no longer necessary when you're
	* done using them.
	*
	* There are a variety of ABD APIs that implement basic buffer operations:
	* compare, copy, read, write, and fill with zeroes. If you need a custom
	* function which progressively accesses the whole ABD, use the abd_iterate_*
	* functions.
	*
	* As an additional feature, linear and scatter ABD's can be stitched together
	* by using the gang ABD type (abd_alloc_gang_abd()). This allows for
	* multiple ABDs to be viewed as a singular ABD.
	*
	* It is possible to make all ABDs linear by setting zfs_abd_scatter_enabled to
	* B_FALSE.
	*/

	#include <sys/abd_impl.h>
	#include <sys/param.h>
	#include <sys/zio.h>
	#include <sys/zfs_context.h>
	#include <sys/zfs_znode.h>

	/* see block comment above for description */
	int zfs_abd_scatter_enabled = B_TRUE;

	void
	abd_verify(abd_t *abd)
	{
	#ifdef ZFS_DEBUG
	ASSERT3U(abd->abd_size, >, 0);
	ASSERT3U(abd->abd_size, <=, SPA_MAXBLOCKSIZE);
	ASSERT3U(abd->abd_flags, ==, abd->abd_flags & (ABD_FLAG_LINEAR \|
	ABD_FLAG_OWNER \| ABD_FLAG_META \| ABD_FLAG_MULTI_ZONE \|
	ABD_FLAG_MULTI_CHUNK \| ABD_FLAG_LINEAR_PAGE \| ABD_FLAG_GANG \|
	ABD_FLAG_GANG_FREE \| ABD_FLAG_ZEROS \| ABD_FLAG_ALLOCD));
	IMPLY(abd->abd_parent != NULL, !(abd->abd_flags & ABD_FLAG_OWNER));
	IMPLY(abd->abd_flags & ABD_FLAG_META, abd->abd_flags & ABD_FLAG_OWNER);
	if (abd_is_linear(abd)) {
	ASSERT3P(ABD_LINEAR_BUF(abd), !=, NULL);
	} else if (abd_is_gang(abd)) {
	uint_t child_sizes = 0;
	for (abd_t *cabd = list_head(&ABD_GANG(abd).abd_gang_chain);
	cabd != NULL;
	cabd = list_next(&ABD_GANG(abd).abd_gang_chain, cabd)) {
	ASSERT(list_link_active(&cabd->abd_gang_link));
	child_sizes += cabd->abd_size;
	abd_verify(cabd);
	}
	ASSERT3U(abd->abd_size, ==, child_sizes);
	} else {
	abd_verify_scatter(abd);
	}
	#endif
	}

	static void
	abd_init_struct(abd_t *abd)
	{
	list_link_init(&abd->abd_gang_link);
	mutex_init(&abd->abd_mtx, NULL, MUTEX_DEFAULT, NULL);
	abd->abd_flags = 0;
	#ifdef ZFS_DEBUG
	zfs_refcount_create(&abd->abd_children);
	abd->abd_parent = NULL;
	#endif
	abd->abd_size = 0;
	}

	static void
	abd_fini_struct(abd_t *abd)
	{
	mutex_destroy(&abd->abd_mtx);
	ASSERT(!list_link_active(&abd->abd_gang_link));
	#ifdef ZFS_DEBUG
	zfs_refcount_destroy(&abd->abd_children);
	#endif
	}

	abd_t *
	abd_alloc_struct(size_t size)
	{
	abd_t *abd = abd_alloc_struct_impl(size);
	abd_init_struct(abd);
	abd->abd_flags \|= ABD_FLAG_ALLOCD;
	return (abd);
	}

	void
	abd_free_struct(abd_t *abd)
	{
	abd_fini_struct(abd);
	abd_free_struct_impl(abd);
	}

	/*
	* Allocate an ABD, along with its own underlying data buffers. Use this if you
	* don't care whether the ABD is linear or not.
	*/
	abd_t *
	abd_alloc(size_t size, boolean_t is_metadata)
	{
	if (!zfs_abd_scatter_enabled \|\| abd_size_alloc_linear(size))
	return (abd_alloc_linear(size, is_metadata));

	VERIFY3U(size, <=, SPA_MAXBLOCKSIZE);

	abd_t *abd = abd_alloc_struct(size);
	abd->abd_flags \|= ABD_FLAG_OWNER;
	abd->abd_u.abd_scatter.abd_offset = 0;
	abd_alloc_chunks(abd, size);

	if (is_metadata) {
	abd->abd_flags \|= ABD_FLAG_META;
	}
	abd->abd_size = size;

	abd_update_scatter_stats(abd, ABDSTAT_INCR);

	return (abd);
	}

	/*
	* Allocate an ABD that must be linear, along with its own underlying data
	* buffer. Only use this when it would be very annoying to write your ABD
	* consumer with a scattered ABD.
	*/
	abd_t *
	abd_alloc_linear(size_t size, boolean_t is_metadata)
	{
	abd_t *abd = abd_alloc_struct(0);

	VERIFY3U(size, <=, SPA_MAXBLOCKSIZE);

	abd->abd_flags \|= ABD_FLAG_LINEAR \| ABD_FLAG_OWNER;
	if (is_metadata) {
	abd->abd_flags \|= ABD_FLAG_META;
	}
	abd->abd_size = size;

	if (is_metadata) {
	ABD_LINEAR_BUF(abd) = zio_buf_alloc(size);
	} else {
	ABD_LINEAR_BUF(abd) = zio_data_buf_alloc(size);
	}

	abd_update_linear_stats(abd, ABDSTAT_INCR);

	return (abd);
	}

	static void
	abd_free_linear(abd_t *abd)
	{
	if (abd_is_linear_page(abd)) {
	abd_free_linear_page(abd);
	return;
	}
	if (abd->abd_flags & ABD_FLAG_META) {
	zio_buf_free(ABD_LINEAR_BUF(abd), abd->abd_size);
	} else {
	zio_data_buf_free(ABD_LINEAR_BUF(abd), abd->abd_size);
	}

	abd_update_linear_stats(abd, ABDSTAT_DECR);
	}

	static void
	abd_free_gang(abd_t *abd)
	{
	ASSERT(abd_is_gang(abd));
	abd_t *cabd;

	while ((cabd = list_head(&ABD_GANG(abd).abd_gang_chain)) != NULL) {
	/*
	* We must acquire the child ABDs mutex to ensure that if it
	* is being added to another gang ABD we will set the link
	* as inactive when removing it from this gang ABD and before
	* adding it to the other gang ABD.
	*/
	mutex_enter(&cabd->abd_mtx);
	ASSERT(list_link_active(&cabd->abd_gang_link));
	list_remove(&ABD_GANG(abd).abd_gang_chain, cabd);
	mutex_exit(&cabd->abd_mtx);
	if (cabd->abd_flags & ABD_FLAG_GANG_FREE)
	abd_free(cabd);
	}
	list_destroy(&ABD_GANG(abd).abd_gang_chain);
	}

	static void
	abd_free_scatter(abd_t *abd)
	{
	abd_free_chunks(abd);
	abd_update_scatter_stats(abd, ABDSTAT_DECR);
	}

	/*
	* Free an ABD. Use with any kind of abd: those created with abd_alloc_*()
	* and abd_get_*(), including abd_get_offset_struct().
	*
	* If the ABD was created with abd_alloc_*(), the underlying data
	* (scatterlist or linear buffer) will also be freed. (Subject to ownership
	* changes via abd_*_ownership_of_buf().)
	*
	* Unless the ABD was created with abd_get_offset_struct(), the abd_t will
	* also be freed.
	*/
	void
	abd_free(abd_t *abd)
	{
	if (abd == NULL)
	return;

	abd_verify(abd);
	#ifdef ZFS_DEBUG
	IMPLY(abd->abd_flags & ABD_FLAG_OWNER, abd->abd_parent == NULL);
	#endif

	if (abd_is_gang(abd)) {
	abd_free_gang(abd);
	} else if (abd_is_linear(abd)) {
	if (abd->abd_flags & ABD_FLAG_OWNER)
	abd_free_linear(abd);
	} else {
	if (abd->abd_flags & ABD_FLAG_OWNER)
	abd_free_scatter(abd);
	}

	#ifdef ZFS_DEBUG
	if (abd->abd_parent != NULL) {
	(void) zfs_refcount_remove_many(&abd->abd_parent->abd_children,
	abd->abd_size, abd);
	}
	#endif

	abd_fini_struct(abd);
	if (abd->abd_flags & ABD_FLAG_ALLOCD)
	abd_free_struct_impl(abd);
	}

	/*
	* Allocate an ABD of the same format (same metadata flag, same scatterize
	* setting) as another ABD.
	*/
	abd_t *
	abd_alloc_sametype(abd_t *sabd, size_t size)
	{
	boolean_t is_metadata = (sabd->abd_flags & ABD_FLAG_META) != 0;
	if (abd_is_linear(sabd) &&
	!abd_is_linear_page(sabd)) {
	return (abd_alloc_linear(size, is_metadata));
	} else {
	return (abd_alloc(size, is_metadata));
	}
	}

	/*
	* Create gang ABD that will be the head of a list of ABD's. This is used
	* to "chain" scatter/gather lists together when constructing aggregated
	* IO's. To free this abd, abd_free() must be called.
	*/
	abd_t *
	abd_alloc_gang(void)
	{
	abd_t *abd = abd_alloc_struct(0);
	abd->abd_flags \|= ABD_FLAG_GANG \| ABD_FLAG_OWNER;
	list_create(&ABD_GANG(abd).abd_gang_chain,
	sizeof (abd_t), offsetof(abd_t, abd_gang_link));
	return (abd);
	}

	/*
	* Add a child gang ABD to a parent gang ABDs chained list.
	*/
	static void
	abd_gang_add_gang(abd_t pabd, abd_t cabd, boolean_t free_on_free)
	{
	ASSERT(abd_is_gang(pabd));
	ASSERT(abd_is_gang(cabd));

	if (free_on_free) {
	/*
	* If the parent is responsible for freeing the child gang
	* ABD we will just splice the child's children ABD list to
	* the parent's list and immediately free the child gang ABD
	* struct. The parent gang ABDs children from the child gang
	* will retain all the free_on_free settings after being
	* added to the parents list.
	*/
	pabd->abd_size += cabd->abd_size;
	list_move_tail(&ABD_GANG(pabd).abd_gang_chain,
	&ABD_GANG(cabd).abd_gang_chain);
	ASSERT(list_is_empty(&ABD_GANG(cabd).abd_gang_chain));
	abd_verify(pabd);
	abd_free(cabd);
	} else {
	for (abd_t *child = list_head(&ABD_GANG(cabd).abd_gang_chain);
	child != NULL;
	child = list_next(&ABD_GANG(cabd).abd_gang_chain, child)) {
	/*
	* We always pass B_FALSE for free_on_free as it is the
	* original child gang ABDs responsibility to determine
	* if any of its child ABDs should be free'd on the call
	* to abd_free().
	*/
	abd_gang_add(pabd, child, B_FALSE);
	}
	abd_verify(pabd);
	}
	}

	/*
	* Add a child ABD to a gang ABD's chained list.
	*/
	void
	abd_gang_add(abd_t pabd, abd_t cabd, boolean_t free_on_free)
	{
	ASSERT(abd_is_gang(pabd));
	abd_t *child_abd = NULL;

	/*
	* If the child being added is a gang ABD, we will add the
	* child's ABDs to the parent gang ABD. This allows us to account
	* for the offset correctly in the parent gang ABD.
	*/
	if (abd_is_gang(cabd)) {
	ASSERT(!list_link_active(&cabd->abd_gang_link));
	ASSERT(!list_is_empty(&ABD_GANG(cabd).abd_gang_chain));
	return (abd_gang_add_gang(pabd, cabd, free_on_free));
	}
	ASSERT(!abd_is_gang(cabd));

	/*
	* In order to verify that an ABD is not already part of
	* another gang ABD, we must lock the child ABD's abd_mtx
	* to check its abd_gang_link status. We unlock the abd_mtx
	* only after it is has been added to a gang ABD, which
	* will update the abd_gang_link's status. See comment below
	* for how an ABD can be in multiple gang ABD's simultaneously.
	*/
	mutex_enter(&cabd->abd_mtx);
	if (list_link_active(&cabd->abd_gang_link)) {
	/*
	* If the child ABD is already part of another
	* gang ABD then we must allocate a new
	* ABD to use a separate link. We mark the newly
	* allocated ABD with ABD_FLAG_GANG_FREE, before
	* adding it to the gang ABD's list, to make the
	* gang ABD aware that it is responsible to call
	* abd_free(). We use abd_get_offset() in order
	* to just allocate a new ABD but avoid copying the
	* data over into the newly allocated ABD.
	*
	* An ABD may become part of multiple gang ABD's. For
	* example, when writing ditto bocks, the same ABD
	* is used to write 2 or 3 locations with 2 or 3
	* zio_t's. Each of the zio's may be aggregated with
	* different adjacent zio's. zio aggregation uses gang
	* zio's, so the single ABD can become part of multiple
	* gang zio's.
	*
	* The ASSERT below is to make sure that if
	* free_on_free is passed as B_TRUE, the ABD can
	* not be in multiple gang ABD's. The gang ABD
	* can not be responsible for cleaning up the child
	* ABD memory allocation if the ABD can be in
	* multiple gang ABD's at one time.
	*/
	ASSERT3B(free_on_free, ==, B_FALSE);
	child_abd = abd_get_offset(cabd, 0);
	child_abd->abd_flags \|= ABD_FLAG_GANG_FREE;
	} else {
	child_abd = cabd;
	if (free_on_free)
	child_abd->abd_flags \|= ABD_FLAG_GANG_FREE;
	}
	ASSERT3P(child_abd, !=, NULL);

	list_insert_tail(&ABD_GANG(pabd).abd_gang_chain, child_abd);
	mutex_exit(&cabd->abd_mtx);
	pabd->abd_size += child_abd->abd_size;
	}

	/*
	* Locate the ABD for the supplied offset in the gang ABD.
	* Return a new offset relative to the returned ABD.
	*/
	abd_t *
	abd_gang_get_offset(abd_t abd, size_t off)
	{
	abd_t *cabd;

	ASSERT(abd_is_gang(abd));
	ASSERT3U(*off, <, abd->abd_size);
	for (cabd = list_head(&ABD_GANG(abd).abd_gang_chain); cabd != NULL;
	cabd = list_next(&ABD_GANG(abd).abd_gang_chain, cabd)) {
	if (*off >= cabd->abd_size)
	*off -= cabd->abd_size;
	else
	return (cabd);
	}
	VERIFY3P(cabd, !=, NULL);
	return (cabd);
	}

	/*
	* Allocate a new ABD, using the provided struct (if non-NULL, and if
	* circumstances allow - otherwise allocate the struct). The returned ABD will
	* point to offset off of sabd. It shares the underlying buffer data with sabd.
	* Use abd_free() to free. sabd must not be freed while any derived ABDs exist.
	*/
	static abd_t *
	abd_get_offset_impl(abd_t abd, abd_t sabd, size_t off, size_t size)
	{
	abd_verify(sabd);
	ASSERT3U(off + size, <=, sabd->abd_size);

	if (abd_is_linear(sabd)) {
	if (abd == NULL)
	abd = abd_alloc_struct(0);
	/*
	* Even if this buf is filesystem metadata, we only track that
	* if we own the underlying data buffer, which is not true in
	* this case. Therefore, we don't ever use ABD_FLAG_META here.
	*/
	abd->abd_flags \|= ABD_FLAG_LINEAR;

	ABD_LINEAR_BUF(abd) = (char *)ABD_LINEAR_BUF(sabd) + off;
	} else if (abd_is_gang(sabd)) {
	size_t left = size;
	if (abd == NULL) {
	abd = abd_alloc_gang();
	} else {
	abd->abd_flags \|= ABD_FLAG_GANG;
	list_create(&ABD_GANG(abd).abd_gang_chain,
	sizeof (abd_t), offsetof(abd_t, abd_gang_link));
	}

	abd->abd_flags &= ~ABD_FLAG_OWNER;
	for (abd_t *cabd = abd_gang_get_offset(sabd, &off);
	cabd != NULL && left > 0;
	cabd = list_next(&ABD_GANG(sabd).abd_gang_chain, cabd)) {
	int csize = MIN(left, cabd->abd_size - off);

	abd_t *nabd = abd_get_offset_size(cabd, off, csize);
	abd_gang_add(abd, nabd, B_TRUE);
	left -= csize;
	off = 0;
	}
	ASSERT3U(left, ==, 0);
	} else {
	- abd = abd_get_offset_scatter(abd, sabd, off);
	+ abd = abd_get_offset_scatter(abd, sabd, off, size);
	}

	ASSERT3P(abd, !=, NULL);
	abd->abd_size = size;
	#ifdef ZFS_DEBUG
	abd->abd_parent = sabd;
	(void) zfs_refcount_add_many(&sabd->abd_children, abd->abd_size, abd);
	#endif
	return (abd);
	}

	/*
	* Like abd_get_offset_size(), but memory for the abd_t is provided by the
	* caller. Using this routine can improve performance by avoiding the cost
	* of allocating memory for the abd_t struct, and updating the abd stats.
	* Usually, the provided abd is returned, but in some circumstances (FreeBSD,
	* if sabd is scatter and size is more than 2 pages) a new abd_t may need to
	* be allocated. Therefore callers should be careful to use the returned
	* abd_t*.
	*/
	abd_t *
	abd_get_offset_struct(abd_t abd, abd_t sabd, size_t off, size_t size)
	{
	abd_t *result;
	abd_init_struct(abd);
	result = abd_get_offset_impl(abd, sabd, off, size);
	if (result != abd)
	abd_fini_struct(abd);
	return (result);
	}

	abd_t *
	abd_get_offset(abd_t *sabd, size_t off)
	{
	size_t size = sabd->abd_size > off ? sabd->abd_size - off : 0;
	VERIFY3U(size, >, 0);
	return (abd_get_offset_impl(NULL, sabd, off, size));
	}

	abd_t *
	abd_get_offset_size(abd_t *sabd, size_t off, size_t size)
	{
	ASSERT3U(off + size, <=, sabd->abd_size);
	return (abd_get_offset_impl(NULL, sabd, off, size));
	}

	/*
	* Return a size scatter ABD containing only zeros.
	*/
	abd_t *
	abd_get_zeros(size_t size)
	{
	ASSERT3P(abd_zero_scatter, !=, NULL);
	ASSERT3U(size, <=, SPA_MAXBLOCKSIZE);
	return (abd_get_offset_size(abd_zero_scatter, 0, size));
	}

	/*
	* Allocate a linear ABD structure for buf.
	*/
	abd_t *
	abd_get_from_buf(void *buf, size_t size)
	{
	abd_t *abd = abd_alloc_struct(0);

	VERIFY3U(size, <=, SPA_MAXBLOCKSIZE);

	/*
	* Even if this buf is filesystem metadata, we only track that if we
	* own the underlying data buffer, which is not true in this case.
	* Therefore, we don't ever use ABD_FLAG_META here.
	*/
	abd->abd_flags \|= ABD_FLAG_LINEAR;
	abd->abd_size = size;

	ABD_LINEAR_BUF(abd) = buf;

	return (abd);
	}

	/*
	* Get the raw buffer associated with a linear ABD.
	*/
	void *
	abd_to_buf(abd_t *abd)
	{
	ASSERT(abd_is_linear(abd));
	abd_verify(abd);
	return (ABD_LINEAR_BUF(abd));
	}

	/*
	* Borrow a raw buffer from an ABD without copying the contents of the ABD
	* into the buffer. If the ABD is scattered, this will allocate a raw buffer
	* whose contents are undefined. To copy over the existing data in the ABD, use
	* abd_borrow_buf_copy() instead.
	*/
	void *
	abd_borrow_buf(abd_t *abd, size_t n)
	{
	void *buf;
	abd_verify(abd);
	ASSERT3U(abd->abd_size, >=, n);
	if (abd_is_linear(abd)) {
	buf = abd_to_buf(abd);
	} else {
	buf = zio_buf_alloc(n);
	}
	#ifdef ZFS_DEBUG
	(void) zfs_refcount_add_many(&abd->abd_children, n, buf);
	#endif
	return (buf);
	}

	void *
	abd_borrow_buf_copy(abd_t *abd, size_t n)
	{
	void *buf = abd_borrow_buf(abd, n);
	if (!abd_is_linear(abd)) {
	abd_copy_to_buf(buf, abd, n);
	}
	return (buf);
	}

	/*
	* Return a borrowed raw buffer to an ABD. If the ABD is scattered, this will
	* not change the contents of the ABD and will ASSERT that you didn't modify
	* the buffer since it was borrowed. If you want any changes you made to buf to
	* be copied back to abd, use abd_return_buf_copy() instead.
	*/
	void
	abd_return_buf(abd_t abd, void buf, size_t n)
	{
	abd_verify(abd);
	ASSERT3U(abd->abd_size, >=, n);
	if (abd_is_linear(abd)) {
	ASSERT3P(buf, ==, abd_to_buf(abd));
	} else {
	ASSERT0(abd_cmp_buf(abd, buf, n));
	zio_buf_free(buf, n);
	}
	#ifdef ZFS_DEBUG
	(void) zfs_refcount_remove_many(&abd->abd_children, n, buf);
	#endif
	}

	void
	abd_return_buf_copy(abd_t abd, void buf, size_t n)
	{
	if (!abd_is_linear(abd)) {
	abd_copy_from_buf(abd, buf, n);
	}
	abd_return_buf(abd, buf, n);
	}

	void
	abd_release_ownership_of_buf(abd_t *abd)
	{
	ASSERT(abd_is_linear(abd));
	ASSERT(abd->abd_flags & ABD_FLAG_OWNER);

	/*
	* abd_free() needs to handle LINEAR_PAGE ABD's specially.
	* Since that flag does not survive the
	* abd_release_ownership_of_buf() -> abd_get_from_buf() ->
	* abd_take_ownership_of_buf() sequence, we don't allow releasing
	* these "linear but not zio_[data_]buf_alloc()'ed" ABD's.
	*/
	ASSERT(!abd_is_linear_page(abd));

	abd_verify(abd);

	abd->abd_flags &= ~ABD_FLAG_OWNER;
	/* Disable this flag since we no longer own the data buffer */
	abd->abd_flags &= ~ABD_FLAG_META;

	abd_update_linear_stats(abd, ABDSTAT_DECR);
	}


	/*
	* Give this ABD ownership of the buffer that it's storing. Can only be used on
	* linear ABDs which were allocated via abd_get_from_buf(), or ones allocated
	* with abd_alloc_linear() which subsequently released ownership of their buf
	* with abd_release_ownership_of_buf().
	*/
	void
	abd_take_ownership_of_buf(abd_t *abd, boolean_t is_metadata)
	{
	ASSERT(abd_is_linear(abd));
	ASSERT(!(abd->abd_flags & ABD_FLAG_OWNER));
	abd_verify(abd);

	abd->abd_flags \|= ABD_FLAG_OWNER;
	if (is_metadata) {
	abd->abd_flags \|= ABD_FLAG_META;
	}

	abd_update_linear_stats(abd, ABDSTAT_INCR);
	}

	/*
	* Initializes an abd_iter based on whether the abd is a gang ABD
	* or just a single ABD.
	*/
	static inline abd_t *
	abd_init_abd_iter(abd_t abd, struct abd_iter aiter, size_t off)
	{
	abd_t *cabd = NULL;

	if (abd_is_gang(abd)) {
	cabd = abd_gang_get_offset(abd, &off);
	if (cabd) {
	abd_iter_init(aiter, cabd);
	abd_iter_advance(aiter, off);
	}
	} else {
	abd_iter_init(aiter, abd);
	abd_iter_advance(aiter, off);
	}
	return (cabd);
	}

	/*
	* Advances an abd_iter. We have to be careful with gang ABD as
	* advancing could mean that we are at the end of a particular ABD and
	* must grab the ABD in the gang ABD's list.
	*/
	static inline abd_t *
	abd_advance_abd_iter(abd_t abd, abd_t cabd, struct abd_iter *aiter,
	size_t len)
	{
	abd_iter_advance(aiter, len);
	if (abd_is_gang(abd) && abd_iter_at_end(aiter)) {
	ASSERT3P(cabd, !=, NULL);
	cabd = list_next(&ABD_GANG(abd).abd_gang_chain, cabd);
	if (cabd) {
	abd_iter_init(aiter, cabd);
	abd_iter_advance(aiter, 0);
	}
	}
	return (cabd);
	}

	int
	abd_iterate_func(abd_t *abd, size_t off, size_t size,
	abd_iter_func_t func, void private)
	{
	struct abd_iter aiter;
	int ret = 0;

	if (size == 0)
	return (0);

	abd_verify(abd);
	ASSERT3U(off + size, <=, abd->abd_size);

	boolean_t gang = abd_is_gang(abd);
	abd_t *c_abd = abd_init_abd_iter(abd, &aiter, off);

	while (size > 0) {
	/* If we are at the end of the gang ABD we are done */
	if (gang && !c_abd)
	break;

	abd_iter_map(&aiter);

	size_t len = MIN(aiter.iter_mapsize, size);
	ASSERT3U(len, >, 0);

	ret = func(aiter.iter_mapaddr, len, private);

	abd_iter_unmap(&aiter);

	if (ret != 0)
	break;

	size -= len;
	c_abd = abd_advance_abd_iter(abd, c_abd, &aiter, len);
	}

	return (ret);
	}

	struct buf_arg {
	void *arg_buf;
	};

	static int
	abd_copy_to_buf_off_cb(void buf, size_t size, void private)
	{
	struct buf_arg *ba_ptr = private;

	(void) memcpy(ba_ptr->arg_buf, buf, size);
	ba_ptr->arg_buf = (char *)ba_ptr->arg_buf + size;

	return (0);
	}

	/*
	* Copy abd to buf. (off is the offset in abd.)
	*/
	void
	abd_copy_to_buf_off(void buf, abd_t abd, size_t off, size_t size)
	{
	struct buf_arg ba_ptr = { buf };

	(void) abd_iterate_func(abd, off, size, abd_copy_to_buf_off_cb,
	&ba_ptr);
	}

	static int
	abd_cmp_buf_off_cb(void buf, size_t size, void private)
	{
	int ret;
	struct buf_arg *ba_ptr = private;

	ret = memcmp(buf, ba_ptr->arg_buf, size);
	ba_ptr->arg_buf = (char *)ba_ptr->arg_buf + size;

	return (ret);
	}

	/*
	* Compare the contents of abd to buf. (off is the offset in abd.)
	*/
	int
	abd_cmp_buf_off(abd_t abd, const void buf, size_t off, size_t size)
	{
	struct buf_arg ba_ptr = { (void *) buf };

	return (abd_iterate_func(abd, off, size, abd_cmp_buf_off_cb, &ba_ptr));
	}

	static int
	abd_copy_from_buf_off_cb(void buf, size_t size, void private)
	{
	struct buf_arg *ba_ptr = private;

	(void) memcpy(buf, ba_ptr->arg_buf, size);
	ba_ptr->arg_buf = (char *)ba_ptr->arg_buf + size;

	return (0);
	}

	/*
	* Copy from buf to abd. (off is the offset in abd.)
	*/
	void
	abd_copy_from_buf_off(abd_t abd, const void buf, size_t off, size_t size)
	{
	struct buf_arg ba_ptr = { (void *) buf };

	(void) abd_iterate_func(abd, off, size, abd_copy_from_buf_off_cb,
	&ba_ptr);
	}

	/ARGSUSED/
	static int
	abd_zero_off_cb(void buf, size_t size, void private)
	{
	(void) memset(buf, 0, size);
	return (0);
	}

	/*
	* Zero out the abd from a particular offset to the end.
	*/
	void
	abd_zero_off(abd_t *abd, size_t off, size_t size)
	{
	(void) abd_iterate_func(abd, off, size, abd_zero_off_cb, NULL);
	}

	/*
	* Iterate over two ABDs and call func incrementally on the two ABDs' data in
	* equal-sized chunks (passed to func as raw buffers). func could be called many
	* times during this iteration.
	*/
	int
	abd_iterate_func2(abd_t dabd, abd_t sabd, size_t doff, size_t soff,
	size_t size, abd_iter_func2_t func, void private)
	{
	int ret = 0;
	struct abd_iter daiter, saiter;
	boolean_t dabd_is_gang_abd, sabd_is_gang_abd;
	abd_t c_dabd, c_sabd;

	if (size == 0)
	return (0);

	abd_verify(dabd);
	abd_verify(sabd);

	ASSERT3U(doff + size, <=, dabd->abd_size);
	ASSERT3U(soff + size, <=, sabd->abd_size);

	dabd_is_gang_abd = abd_is_gang(dabd);
	sabd_is_gang_abd = abd_is_gang(sabd);
	c_dabd = abd_init_abd_iter(dabd, &daiter, doff);
	c_sabd = abd_init_abd_iter(sabd, &saiter, soff);

	while (size > 0) {
	/* if we are at the end of the gang ABD we are done */
	if ((dabd_is_gang_abd && !c_dabd) \|\|
	(sabd_is_gang_abd && !c_sabd))
	break;

	abd_iter_map(&daiter);
	abd_iter_map(&saiter);

	size_t dlen = MIN(daiter.iter_mapsize, size);
	size_t slen = MIN(saiter.iter_mapsize, size);
	size_t len = MIN(dlen, slen);
	ASSERT(dlen > 0 \|\| slen > 0);

	ret = func(daiter.iter_mapaddr, saiter.iter_mapaddr, len,
	private);

	abd_iter_unmap(&saiter);
	abd_iter_unmap(&daiter);

	if (ret != 0)
	break;

	size -= len;
	c_dabd =
	abd_advance_abd_iter(dabd, c_dabd, &daiter, len);
	c_sabd =
	abd_advance_abd_iter(sabd, c_sabd, &saiter, len);
	}

	return (ret);
	}

	/ARGSUSED/
	static int
	abd_copy_off_cb(void dbuf, void sbuf, size_t size, void *private)
	{
	(void) memcpy(dbuf, sbuf, size);
	return (0);
	}

	/*
	* Copy from sabd to dabd starting from soff and doff.
	*/
	void
	abd_copy_off(abd_t dabd, abd_t sabd, size_t doff, size_t soff, size_t size)
	{
	(void) abd_iterate_func2(dabd, sabd, doff, soff, size,
	abd_copy_off_cb, NULL);
	}

	/ARGSUSED/
	static int
	abd_cmp_cb(void bufa, void bufb, size_t size, void *private)
	{
	return (memcmp(bufa, bufb, size));
	}

	/*
	* Compares the contents of two ABDs.
	*/
	int
	abd_cmp(abd_t dabd, abd_t sabd)
	{
	ASSERT3U(dabd->abd_size, ==, sabd->abd_size);
	return (abd_iterate_func2(dabd, sabd, 0, 0, dabd->abd_size,
	abd_cmp_cb, NULL));
	}

	/*
	* Iterate over code ABDs and a data ABD and call @func_raidz_gen.
	*
	* @cabds parity ABDs, must have equal size
	* @dabd data ABD. Can be NULL (in this case @dsize = 0)
	* @func_raidz_gen should be implemented so that its behaviour
	* is the same when taking linear and when taking scatter
	*/
	void
	abd_raidz_gen_iterate(abd_t *cabds, abd_t dabd,
	ssize_t csize, ssize_t dsize, const unsigned parity,
	void (func_raidz_gen)(void , const void , size_t, size_t))
	{
	int i;
	ssize_t len, dlen;
	struct abd_iter caiters[3];
	struct abd_iter daiter = {0};
	void *caddrs[3];
	unsigned long flags __maybe_unused = 0;
	abd_t *c_cabds[3];
	abd_t *c_dabd = NULL;
	boolean_t cabds_is_gang_abd[3];
	boolean_t dabd_is_gang_abd = B_FALSE;

	ASSERT3U(parity, <=, 3);

	for (i = 0; i < parity; i++) {
	cabds_is_gang_abd[i] = abd_is_gang(cabds[i]);
	c_cabds[i] = abd_init_abd_iter(cabds[i], &caiters[i], 0);
	}

	if (dabd) {
	dabd_is_gang_abd = abd_is_gang(dabd);
	c_dabd = abd_init_abd_iter(dabd, &daiter, 0);
	}

	ASSERT3S(dsize, >=, 0);

	abd_enter_critical(flags);
	while (csize > 0) {
	/* if we are at the end of the gang ABD we are done */
	if (dabd_is_gang_abd && !c_dabd)
	break;

	for (i = 0; i < parity; i++) {
	/*
	* If we are at the end of the gang ABD we are
	* done.
	*/
	if (cabds_is_gang_abd[i] && !c_cabds[i])
	break;
	abd_iter_map(&caiters[i]);
	caddrs[i] = caiters[i].iter_mapaddr;
	}

	len = csize;

	if (dabd && dsize > 0)
	abd_iter_map(&daiter);

	switch (parity) {
	case 3:
	len = MIN(caiters[2].iter_mapsize, len);
	/* falls through */
	case 2:
	len = MIN(caiters[1].iter_mapsize, len);
	/* falls through */
	case 1:
	len = MIN(caiters[0].iter_mapsize, len);
	}

	/* must be progressive */
	ASSERT3S(len, >, 0);

	if (dabd && dsize > 0) {
	/* this needs precise iter.length */
	len = MIN(daiter.iter_mapsize, len);
	dlen = len;
	} else
	dlen = 0;

	/* must be progressive */
	ASSERT3S(len, >, 0);
	/*
	* The iterated function likely will not do well if each
	* segment except the last one is not multiple of 512 (raidz).
	*/
	ASSERT3U(((uint64_t)len & 511ULL), ==, 0);

	func_raidz_gen(caddrs, daiter.iter_mapaddr, len, dlen);

	for (i = parity-1; i >= 0; i--) {
	abd_iter_unmap(&caiters[i]);
	c_cabds[i] =
	abd_advance_abd_iter(cabds[i], c_cabds[i],
	&caiters[i], len);
	}

	if (dabd && dsize > 0) {
	abd_iter_unmap(&daiter);
	c_dabd =
	abd_advance_abd_iter(dabd, c_dabd, &daiter,
	dlen);
	dsize -= dlen;
	}

	csize -= len;

	ASSERT3S(dsize, >=, 0);
	ASSERT3S(csize, >=, 0);
	}
	abd_exit_critical(flags);
	}

	/*
	* Iterate over code ABDs and data reconstruction target ABDs and call
	* @func_raidz_rec. Function maps at most 6 pages atomically.
	*
	* @cabds parity ABDs, must have equal size
	* @tabds rec target ABDs, at most 3
	* @tsize size of data target columns
	* @func_raidz_rec expects syndrome data in target columns. Function
	* reconstructs data and overwrites target columns.
	*/
	void
	abd_raidz_rec_iterate(abd_t cabds, abd_t tabds,
	ssize_t tsize, const unsigned parity,
	void (func_raidz_rec)(void t, const size_t tsize, void *c,
	const unsigned *mul),
	const unsigned *mul)
	{
	int i;
	ssize_t len;
	struct abd_iter citers[3];
	struct abd_iter xiters[3];
	void caddrs[3], xaddrs[3];
	unsigned long flags __maybe_unused = 0;
	boolean_t cabds_is_gang_abd[3];
	boolean_t tabds_is_gang_abd[3];
	abd_t *c_cabds[3];
	abd_t *c_tabds[3];

	ASSERT3U(parity, <=, 3);

	for (i = 0; i < parity; i++) {
	cabds_is_gang_abd[i] = abd_is_gang(cabds[i]);
	tabds_is_gang_abd[i] = abd_is_gang(tabds[i]);
	c_cabds[i] =
	abd_init_abd_iter(cabds[i], &citers[i], 0);
	c_tabds[i] =
	abd_init_abd_iter(tabds[i], &xiters[i], 0);
	}

	abd_enter_critical(flags);
	while (tsize > 0) {

	for (i = 0; i < parity; i++) {
	/*
	* If we are at the end of the gang ABD we
	* are done.
	*/
	if (cabds_is_gang_abd[i] && !c_cabds[i])
	break;
	if (tabds_is_gang_abd[i] && !c_tabds[i])
	break;
	abd_iter_map(&citers[i]);
	abd_iter_map(&xiters[i]);
	caddrs[i] = citers[i].iter_mapaddr;
	xaddrs[i] = xiters[i].iter_mapaddr;
	}

	len = tsize;
	switch (parity) {
	case 3:
	len = MIN(xiters[2].iter_mapsize, len);
	len = MIN(citers[2].iter_mapsize, len);
	/* falls through */
	case 2:
	len = MIN(xiters[1].iter_mapsize, len);
	len = MIN(citers[1].iter_mapsize, len);
	/* falls through */
	case 1:
	len = MIN(xiters[0].iter_mapsize, len);
	len = MIN(citers[0].iter_mapsize, len);
	}
	/* must be progressive */
	ASSERT3S(len, >, 0);
	/*
	* The iterated function likely will not do well if each
	* segment except the last one is not multiple of 512 (raidz).
	*/
	ASSERT3U(((uint64_t)len & 511ULL), ==, 0);

	func_raidz_rec(xaddrs, len, caddrs, mul);

	for (i = parity-1; i >= 0; i--) {
	abd_iter_unmap(&xiters[i]);
	abd_iter_unmap(&citers[i]);
	c_tabds[i] =
	abd_advance_abd_iter(tabds[i], c_tabds[i],
	&xiters[i], len);
	c_cabds[i] =
	abd_advance_abd_iter(cabds[i], c_cabds[i],
	&citers[i], len);
	}

	tsize -= len;
	ASSERT3S(tsize, >=, 0);
	}
	abd_exit_critical(flags);
	}
	diff --git a/sys/contrib/openzfs/module/zfs/arc.c b/sys/contrib/openzfs/module/zfs/arc.c
	index 2226539a1e2c..b864394b42a0 100644
	--- a/sys/contrib/openzfs/module/zfs/arc.c
	+++ b/sys/contrib/openzfs/module/zfs/arc.c
	@@ -1,11053 +1,11110 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2018, Joyent, Inc.
	* Copyright (c) 2011, 2020, Delphix. All rights reserved.
	* Copyright (c) 2014, Saso Kiselkov. All rights reserved.
	* Copyright (c) 2017, Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
	* Copyright (c) 2020, George Amanakis. All rights reserved.
	* Copyright (c) 2019, Klara Inc.
	* Copyright (c) 2019, Allan Jude
	* Copyright (c) 2020, The FreeBSD Foundation [1]
	*
	* [1] Portions of this software were developed by Allan Jude
	* under sponsorship from the FreeBSD Foundation.
	*/

	/*
	* DVA-based Adjustable Replacement Cache
	*
	* While much of the theory of operation used here is
	* based on the self-tuning, low overhead replacement cache
	* presented by Megiddo and Modha at FAST 2003, there are some
	* significant differences:
	*
	* 1. The Megiddo and Modha model assumes any page is evictable.
	* Pages in its cache cannot be "locked" into memory. This makes
	* the eviction algorithm simple: evict the last page in the list.
	* This also make the performance characteristics easy to reason
	* about. Our cache is not so simple. At any given moment, some
	* subset of the blocks in the cache are un-evictable because we
	* have handed out a reference to them. Blocks are only evictable
	* when there are no external references active. This makes
	* eviction far more problematic: we choose to evict the evictable
	* blocks that are the "lowest" in the list.
	*
	* There are times when it is not possible to evict the requested
	* space. In these circumstances we are unable to adjust the cache
	* size. To prevent the cache growing unbounded at these times we
	* implement a "cache throttle" that slows the flow of new data
	* into the cache until we can make space available.
	*
	* 2. The Megiddo and Modha model assumes a fixed cache size.
	* Pages are evicted when the cache is full and there is a cache
	* miss. Our model has a variable sized cache. It grows with
	* high use, but also tries to react to memory pressure from the
	* operating system: decreasing its size when system memory is
	* tight.
	*
	* 3. The Megiddo and Modha model assumes a fixed page size. All
	* elements of the cache are therefore exactly the same size. So
	* when adjusting the cache size following a cache miss, its simply
	* a matter of choosing a single page to evict. In our model, we
	* have variable sized cache blocks (ranging from 512 bytes to
	* 128K bytes). We therefore choose a set of blocks to evict to make
	* space for a cache miss that approximates as closely as possible
	* the space used by the new block.
	*
	* See also: "ARC: A Self-Tuning, Low Overhead Replacement Cache"
	* by N. Megiddo & D. Modha, FAST 2003
	*/

	/*
	* The locking model:
	*
	* A new reference to a cache buffer can be obtained in two
	* ways: 1) via a hash table lookup using the DVA as a key,
	* or 2) via one of the ARC lists. The arc_read() interface
	* uses method 1, while the internal ARC algorithms for
	* adjusting the cache use method 2. We therefore provide two
	* types of locks: 1) the hash table lock array, and 2) the
	* ARC list locks.
	*
	* Buffers do not have their own mutexes, rather they rely on the
	* hash table mutexes for the bulk of their protection (i.e. most
	* fields in the arc_buf_hdr_t are protected by these mutexes).
	*
	* buf_hash_find() returns the appropriate mutex (held) when it
	* locates the requested buffer in the hash table. It returns
	* NULL for the mutex if the buffer was not in the table.
	*
	* buf_hash_remove() expects the appropriate hash mutex to be
	* already held before it is invoked.
	*
	* Each ARC state also has a mutex which is used to protect the
	* buffer list associated with the state. When attempting to
	* obtain a hash table lock while holding an ARC list lock you
	* must use: mutex_tryenter() to avoid deadlock. Also note that
	* the active state mutex must be held before the ghost state mutex.
	*
	* It as also possible to register a callback which is run when the
	* arc_meta_limit is reached and no buffers can be safely evicted. In
	* this case the arc user should drop a reference on some arc buffers so
	* they can be reclaimed and the arc_meta_limit honored. For example,
	* when using the ZPL each dentry holds a references on a znode. These
	* dentries must be pruned before the arc buffer holding the znode can
	* be safely evicted.
	*
	* Note that the majority of the performance stats are manipulated
	* with atomic operations.
	*
	* The L2ARC uses the l2ad_mtx on each vdev for the following:
	*
	* - L2ARC buflist creation
	* - L2ARC buflist eviction
	* - L2ARC write completion, which walks L2ARC buflists
	* - ARC header destruction, as it removes from L2ARC buflists
	* - ARC header release, as it removes from L2ARC buflists
	*/

	/*
	* ARC operation:
	*
	* Every block that is in the ARC is tracked by an arc_buf_hdr_t structure.
	* This structure can point either to a block that is still in the cache or to
	* one that is only accessible in an L2 ARC device, or it can provide
	* information about a block that was recently evicted. If a block is
	* only accessible in the L2ARC, then the arc_buf_hdr_t only has enough
	* information to retrieve it from the L2ARC device. This information is
	* stored in the l2arc_buf_hdr_t sub-structure of the arc_buf_hdr_t. A block
	* that is in this state cannot access the data directly.
	*
	* Blocks that are actively being referenced or have not been evicted
	* are cached in the L1ARC. The L1ARC (l1arc_buf_hdr_t) is a structure within
	* the arc_buf_hdr_t that will point to the data block in memory. A block can
	* only be read by a consumer if it has an l1arc_buf_hdr_t. The L1ARC
	* caches data in two ways -- in a list of ARC buffers (arc_buf_t) and
	* also in the arc_buf_hdr_t's private physical data block pointer (b_pabd).
	*
	* The L1ARC's data pointer may or may not be uncompressed. The ARC has the
	* ability to store the physical data (b_pabd) associated with the DVA of the
	* arc_buf_hdr_t. Since the b_pabd is a copy of the on-disk physical block,
	* it will match its on-disk compression characteristics. This behavior can be
	* disabled by setting 'zfs_compressed_arc_enabled' to B_FALSE. When the
	* compressed ARC functionality is disabled, the b_pabd will point to an
	* uncompressed version of the on-disk data.
	*
	* Data in the L1ARC is not accessed by consumers of the ARC directly. Each
	* arc_buf_hdr_t can have multiple ARC buffers (arc_buf_t) which reference it.
	* Each ARC buffer (arc_buf_t) is being actively accessed by a specific ARC
	* consumer. The ARC will provide references to this data and will keep it
	* cached until it is no longer in use. The ARC caches only the L1ARC's physical
	* data block and will evict any arc_buf_t that is no longer referenced. The
	* amount of memory consumed by the arc_buf_ts' data buffers can be seen via the
	* "overhead_size" kstat.
	*
	* Depending on the consumer, an arc_buf_t can be requested in uncompressed or
	* compressed form. The typical case is that consumers will want uncompressed
	* data, and when that happens a new data buffer is allocated where the data is
	* decompressed for them to use. Currently the only consumer who wants
	* compressed arc_buf_t's is "zfs send", when it streams data exactly as it
	* exists on disk. When this happens, the arc_buf_t's data buffer is shared
	* with the arc_buf_hdr_t.
	*
	* Here is a diagram showing an arc_buf_hdr_t referenced by two arc_buf_t's. The
	* first one is owned by a compressed send consumer (and therefore references
	* the same compressed data buffer as the arc_buf_hdr_t) and the second could be
	* used by any other consumer (and has its own uncompressed copy of the data
	* buffer).
	*
	* arc_buf_hdr_t
	* +-----------+
	* \| fields \|
	* \| common to \|
	* \| L1- and \|
	* \| L2ARC \|
	* +-----------+
	* \| l2arc_buf_hdr_t
	* \| \|
	* +-----------+
	* \| l1arc_buf_hdr_t
	* \| \| arc_buf_t
	* \| b_buf +------------>+-----------+ arc_buf_t
	* \| b_pabd +-+ \|b_next +---->+-----------+
	* +-----------+ \| \|-----------\| \|b_next +-->NULL
	* \| \|b_comp = T \| +-----------+
	* \| \|b_data +-+ \|b_comp = F \|
	* \| +-----------+ \| \|b_data +-+
	* +->+------+ \| +-----------+ \|
	* compressed \| \| \| \|
	* data \| \|<--------------+ \| uncompressed
	* +------+ compressed, \| data
	* shared +-->+------+
	* data \| \|
	* \| \|
	* +------+
	*
	* When a consumer reads a block, the ARC must first look to see if the
	* arc_buf_hdr_t is cached. If the hdr is cached then the ARC allocates a new
	* arc_buf_t and either copies uncompressed data into a new data buffer from an
	* existing uncompressed arc_buf_t, decompresses the hdr's b_pabd buffer into a
	* new data buffer, or shares the hdr's b_pabd buffer, depending on whether the
	* hdr is compressed and the desired compression characteristics of the
	* arc_buf_t consumer. If the arc_buf_t ends up sharing data with the
	* arc_buf_hdr_t and both of them are uncompressed then the arc_buf_t must be
	* the last buffer in the hdr's b_buf list, however a shared compressed buf can
	* be anywhere in the hdr's list.
	*
	* The diagram below shows an example of an uncompressed ARC hdr that is
	* sharing its data with an arc_buf_t (note that the shared uncompressed buf is
	* the last element in the buf list):
	*
	* arc_buf_hdr_t
	* +-----------+
	* \| \|
	* \| \|
	* \| \|
	* +-----------+
	* l2arc_buf_hdr_t\| \|
	* \| \|
	* +-----------+
	* l1arc_buf_hdr_t\| \|
	* \| \| arc_buf_t (shared)
	* \| b_buf +------------>+---------+ arc_buf_t
	* \| \| \|b_next +---->+---------+
	* \| b_pabd +-+ \|---------\| \|b_next +-->NULL
	* +-----------+ \| \| \| +---------+
	* \| \|b_data +-+ \| \|
	* \| +---------+ \| \|b_data +-+
	* +->+------+ \| +---------+ \|
	* \| \| \| \|
	* uncompressed \| \| \| \|
	* data +------+ \| \|
	* ^ +->+------+ \|
	* \| uncompressed \| \| \|
	* \| data \| \| \|
	* \| +------+ \|
	* +---------------------------------+
	*
	* Writing to the ARC requires that the ARC first discard the hdr's b_pabd
	* since the physical block is about to be rewritten. The new data contents
	* will be contained in the arc_buf_t. As the I/O pipeline performs the write,
	* it may compress the data before writing it to disk. The ARC will be called
	* with the transformed data and will bcopy the transformed on-disk block into
	* a newly allocated b_pabd. Writes are always done into buffers which have
	* either been loaned (and hence are new and don't have other readers) or
	* buffers which have been released (and hence have their own hdr, if there
	* were originally other readers of the buf's original hdr). This ensures that
	* the ARC only needs to update a single buf and its hdr after a write occurs.
	*
	* When the L2ARC is in use, it will also take advantage of the b_pabd. The
	* L2ARC will always write the contents of b_pabd to the L2ARC. This means
	* that when compressed ARC is enabled that the L2ARC blocks are identical
	* to the on-disk block in the main data pool. This provides a significant
	* advantage since the ARC can leverage the bp's checksum when reading from the
	* L2ARC to determine if the contents are valid. However, if the compressed
	* ARC is disabled, then the L2ARC's block must be transformed to look
	* like the physical block in the main data pool before comparing the
	* checksum and determining its validity.
	*
	* The L1ARC has a slightly different system for storing encrypted data.
	* Raw (encrypted + possibly compressed) data has a few subtle differences from
	* data that is just compressed. The biggest difference is that it is not
	* possible to decrypt encrypted data (or vice-versa) if the keys aren't loaded.
	* The other difference is that encryption cannot be treated as a suggestion.
	* If a caller would prefer compressed data, but they actually wind up with
	* uncompressed data the worst thing that could happen is there might be a
	* performance hit. If the caller requests encrypted data, however, we must be
	* sure they actually get it or else secret information could be leaked. Raw
	* data is stored in hdr->b_crypt_hdr.b_rabd. An encrypted header, therefore,
	* may have both an encrypted version and a decrypted version of its data at
	* once. When a caller needs a raw arc_buf_t, it is allocated and the data is
	* copied out of this header. To avoid complications with b_pabd, raw buffers
	* cannot be shared.
	*/

	#include <sys/spa.h>
	#include <sys/zio.h>
	#include <sys/spa_impl.h>
	#include <sys/zio_compress.h>
	#include <sys/zio_checksum.h>
	#include <sys/zfs_context.h>
	#include <sys/arc.h>
	#include <sys/zfs_refcount.h>
	#include <sys/vdev.h>
	#include <sys/vdev_impl.h>
	#include <sys/dsl_pool.h>
	#include <sys/multilist.h>
	#include <sys/abd.h>
	#include <sys/zil.h>
	#include <sys/fm/fs/zfs.h>
	#include <sys/callb.h>
	#include <sys/kstat.h>
	#include <sys/zthr.h>
	#include <zfs_fletcher.h>
	#include <sys/arc_impl.h>
	#include <sys/trace_zfs.h>
	#include <sys/aggsum.h>
	#include <sys/wmsum.h>
	#include <cityhash.h>
	#include <sys/vdev_trim.h>
	#include <sys/zfs_racct.h>
	#include <sys/zstd/zstd.h>

	#ifndef _KERNEL
	/* set with ZFS_DEBUG=watch, to enable watchpoints on frozen buffers */
	boolean_t arc_watch = B_FALSE;
	#endif

	/*
	* This thread's job is to keep enough free memory in the system, by
	* calling arc_kmem_reap_soon() plus arc_reduce_target_size(), which improves
	* arc_available_memory().
	*/
	static zthr_t *arc_reap_zthr;

	/*
	* This thread's job is to keep arc_size under arc_c, by calling
	* arc_evict(), which improves arc_is_overflowing().
	*/
	static zthr_t *arc_evict_zthr;

	static kmutex_t arc_evict_lock;
	static boolean_t arc_evict_needed = B_FALSE;

	/*
	* Count of bytes evicted since boot.
	*/
	static uint64_t arc_evict_count;

	/*
	* List of arc_evict_waiter_t's, representing threads waiting for the
	* arc_evict_count to reach specific values.
	*/
	static list_t arc_evict_waiters;

	/*
	* When arc_is_overflowing(), arc_get_data_impl() waits for this percent of
	* the requested amount of data to be evicted. For example, by default for
	* every 2KB that's evicted, 1KB of it may be "reused" by a new allocation.
	* Since this is above 100%, it ensures that progress is made towards getting
	* arc_size under arc_c. Since this is finite, it ensures that allocations
	* can still happen, even during the potentially long time that arc_size is
	* more than arc_c.
	*/
	int zfs_arc_eviction_pct = 200;

	/*
	* The number of headers to evict in arc_evict_state_impl() before
	* dropping the sublist lock and evicting from another sublist. A lower
	* value means we're more likely to evict the "correct" header (i.e. the
	* oldest header in the arc state), but comes with higher overhead
	* (i.e. more invocations of arc_evict_state_impl()).
	*/
	int zfs_arc_evict_batch_limit = 10;

	/* number of seconds before growing cache again */
	int arc_grow_retry = 5;

	/*
	* Minimum time between calls to arc_kmem_reap_soon().
	*/
	int arc_kmem_cache_reap_retry_ms = 1000;

	/* shift of arc_c for calculating overflow limit in arc_get_data_impl */
	int zfs_arc_overflow_shift = 8;

	/* shift of arc_c for calculating both min and max arc_p */
	int arc_p_min_shift = 4;

	/* log2(fraction of arc to reclaim) */
	int arc_shrink_shift = 7;

	/* percent of pagecache to reclaim arc to */
	#ifdef _KERNEL
	uint_t zfs_arc_pc_percent = 0;
	#endif

	/*
	* log2(fraction of ARC which must be free to allow growing).
	* I.e. If there is less than arc_c >> arc_no_grow_shift free memory,
	* when reading a new block into the ARC, we will evict an equal-sized block
	* from the ARC.
	*
	* This must be less than arc_shrink_shift, so that when we shrink the ARC,
	* we will still not allow it to grow.
	*/
	int arc_no_grow_shift = 5;


	/*
	* minimum lifespan of a prefetch block in clock ticks
	* (initialized in arc_init())
	*/
	static int arc_min_prefetch_ms;
	static int arc_min_prescient_prefetch_ms;

	/*
	* If this percent of memory is free, don't throttle.
	*/
	int arc_lotsfree_percent = 10;

	/*
	* The arc has filled available memory and has now warmed up.
	*/
	boolean_t arc_warm;

	/*
	* These tunables are for performance analysis.
	*/
	unsigned long zfs_arc_max = 0;
	unsigned long zfs_arc_min = 0;
	unsigned long zfs_arc_meta_limit = 0;
	unsigned long zfs_arc_meta_min = 0;
	unsigned long zfs_arc_dnode_limit = 0;
	unsigned long zfs_arc_dnode_reduce_percent = 10;
	int zfs_arc_grow_retry = 0;
	int zfs_arc_shrink_shift = 0;
	int zfs_arc_p_min_shift = 0;
	int zfs_arc_average_blocksize = 8 * 1024; /* 8KB */

	/*
	* ARC dirty data constraints for arc_tempreserve_space() throttle.
	*/
	unsigned long zfs_arc_dirty_limit_percent = 50; /* total dirty data limit */
	unsigned long zfs_arc_anon_limit_percent = 25; /* anon block dirty limit */
	unsigned long zfs_arc_pool_dirty_percent = 20; /* each pool's anon allowance */

	/*
	* Enable or disable compressed arc buffers.
	*/
	int zfs_compressed_arc_enabled = B_TRUE;

	/*
	* ARC will evict meta buffers that exceed arc_meta_limit. This
	* tunable make arc_meta_limit adjustable for different workloads.
	*/
	unsigned long zfs_arc_meta_limit_percent = 75;

	/*
	* Percentage that can be consumed by dnodes of ARC meta buffers.
	*/
	unsigned long zfs_arc_dnode_limit_percent = 10;

	/*
	* These tunables are Linux specific
	*/
	unsigned long zfs_arc_sys_free = 0;
	int zfs_arc_min_prefetch_ms = 0;
	int zfs_arc_min_prescient_prefetch_ms = 0;
	int zfs_arc_p_dampener_disable = 1;
	int zfs_arc_meta_prune = 10000;
	int zfs_arc_meta_strategy = ARC_STRATEGY_META_BALANCED;
	int zfs_arc_meta_adjust_restarts = 4096;
	int zfs_arc_lotsfree_percent = 10;

	/* The 6 states: */
	arc_state_t ARC_anon;
	arc_state_t ARC_mru;
	arc_state_t ARC_mru_ghost;
	arc_state_t ARC_mfu;
	arc_state_t ARC_mfu_ghost;
	arc_state_t ARC_l2c_only;

	arc_stats_t arc_stats = {
	{ "hits", KSTAT_DATA_UINT64 },
	{ "misses", KSTAT_DATA_UINT64 },
	{ "demand_data_hits", KSTAT_DATA_UINT64 },
	{ "demand_data_misses", KSTAT_DATA_UINT64 },
	{ "demand_metadata_hits", KSTAT_DATA_UINT64 },
	{ "demand_metadata_misses", KSTAT_DATA_UINT64 },
	{ "prefetch_data_hits", KSTAT_DATA_UINT64 },
	{ "prefetch_data_misses", KSTAT_DATA_UINT64 },
	{ "prefetch_metadata_hits", KSTAT_DATA_UINT64 },
	{ "prefetch_metadata_misses", KSTAT_DATA_UINT64 },
	{ "mru_hits", KSTAT_DATA_UINT64 },
	{ "mru_ghost_hits", KSTAT_DATA_UINT64 },
	{ "mfu_hits", KSTAT_DATA_UINT64 },
	{ "mfu_ghost_hits", KSTAT_DATA_UINT64 },
	{ "deleted", KSTAT_DATA_UINT64 },
	{ "mutex_miss", KSTAT_DATA_UINT64 },
	{ "access_skip", KSTAT_DATA_UINT64 },
	{ "evict_skip", KSTAT_DATA_UINT64 },
	{ "evict_not_enough", KSTAT_DATA_UINT64 },
	{ "evict_l2_cached", KSTAT_DATA_UINT64 },
	{ "evict_l2_eligible", KSTAT_DATA_UINT64 },
	{ "evict_l2_eligible_mfu", KSTAT_DATA_UINT64 },
	{ "evict_l2_eligible_mru", KSTAT_DATA_UINT64 },
	{ "evict_l2_ineligible", KSTAT_DATA_UINT64 },
	{ "evict_l2_skip", KSTAT_DATA_UINT64 },
	{ "hash_elements", KSTAT_DATA_UINT64 },
	{ "hash_elements_max", KSTAT_DATA_UINT64 },
	{ "hash_collisions", KSTAT_DATA_UINT64 },
	{ "hash_chains", KSTAT_DATA_UINT64 },
	{ "hash_chain_max", KSTAT_DATA_UINT64 },
	{ "p", KSTAT_DATA_UINT64 },
	{ "c", KSTAT_DATA_UINT64 },
	{ "c_min", KSTAT_DATA_UINT64 },
	{ "c_max", KSTAT_DATA_UINT64 },
	{ "size", KSTAT_DATA_UINT64 },
	{ "compressed_size", KSTAT_DATA_UINT64 },
	{ "uncompressed_size", KSTAT_DATA_UINT64 },
	{ "overhead_size", KSTAT_DATA_UINT64 },
	{ "hdr_size", KSTAT_DATA_UINT64 },
	{ "data_size", KSTAT_DATA_UINT64 },
	{ "metadata_size", KSTAT_DATA_UINT64 },
	{ "dbuf_size", KSTAT_DATA_UINT64 },
	{ "dnode_size", KSTAT_DATA_UINT64 },
	{ "bonus_size", KSTAT_DATA_UINT64 },
	#if defined(COMPAT_FREEBSD11)
	{ "other_size", KSTAT_DATA_UINT64 },
	#endif
	{ "anon_size", KSTAT_DATA_UINT64 },
	{ "anon_evictable_data", KSTAT_DATA_UINT64 },
	{ "anon_evictable_metadata", KSTAT_DATA_UINT64 },
	{ "mru_size", KSTAT_DATA_UINT64 },
	{ "mru_evictable_data", KSTAT_DATA_UINT64 },
	{ "mru_evictable_metadata", KSTAT_DATA_UINT64 },
	{ "mru_ghost_size", KSTAT_DATA_UINT64 },
	{ "mru_ghost_evictable_data", KSTAT_DATA_UINT64 },
	{ "mru_ghost_evictable_metadata", KSTAT_DATA_UINT64 },
	{ "mfu_size", KSTAT_DATA_UINT64 },
	{ "mfu_evictable_data", KSTAT_DATA_UINT64 },
	{ "mfu_evictable_metadata", KSTAT_DATA_UINT64 },
	{ "mfu_ghost_size", KSTAT_DATA_UINT64 },
	{ "mfu_ghost_evictable_data", KSTAT_DATA_UINT64 },
	{ "mfu_ghost_evictable_metadata", KSTAT_DATA_UINT64 },
	{ "l2_hits", KSTAT_DATA_UINT64 },
	{ "l2_misses", KSTAT_DATA_UINT64 },
	{ "l2_prefetch_asize", KSTAT_DATA_UINT64 },
	{ "l2_mru_asize", KSTAT_DATA_UINT64 },
	{ "l2_mfu_asize", KSTAT_DATA_UINT64 },
	{ "l2_bufc_data_asize", KSTAT_DATA_UINT64 },
	{ "l2_bufc_metadata_asize", KSTAT_DATA_UINT64 },
	{ "l2_feeds", KSTAT_DATA_UINT64 },
	{ "l2_rw_clash", KSTAT_DATA_UINT64 },
	{ "l2_read_bytes", KSTAT_DATA_UINT64 },
	{ "l2_write_bytes", KSTAT_DATA_UINT64 },
	{ "l2_writes_sent", KSTAT_DATA_UINT64 },
	{ "l2_writes_done", KSTAT_DATA_UINT64 },
	{ "l2_writes_error", KSTAT_DATA_UINT64 },
	{ "l2_writes_lock_retry", KSTAT_DATA_UINT64 },
	{ "l2_evict_lock_retry", KSTAT_DATA_UINT64 },
	{ "l2_evict_reading", KSTAT_DATA_UINT64 },
	{ "l2_evict_l1cached", KSTAT_DATA_UINT64 },
	{ "l2_free_on_write", KSTAT_DATA_UINT64 },
	{ "l2_abort_lowmem", KSTAT_DATA_UINT64 },
	{ "l2_cksum_bad", KSTAT_DATA_UINT64 },
	{ "l2_io_error", KSTAT_DATA_UINT64 },
	{ "l2_size", KSTAT_DATA_UINT64 },
	{ "l2_asize", KSTAT_DATA_UINT64 },
	{ "l2_hdr_size", KSTAT_DATA_UINT64 },
	{ "l2_log_blk_writes", KSTAT_DATA_UINT64 },
	{ "l2_log_blk_avg_asize", KSTAT_DATA_UINT64 },
	{ "l2_log_blk_asize", KSTAT_DATA_UINT64 },
	{ "l2_log_blk_count", KSTAT_DATA_UINT64 },
	{ "l2_data_to_meta_ratio", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_success", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_unsupported", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_io_errors", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_dh_errors", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_cksum_lb_errors", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_lowmem", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_size", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_asize", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_bufs", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_bufs_precached", KSTAT_DATA_UINT64 },
	{ "l2_rebuild_log_blks", KSTAT_DATA_UINT64 },
	{ "memory_throttle_count", KSTAT_DATA_UINT64 },
	{ "memory_direct_count", KSTAT_DATA_UINT64 },
	{ "memory_indirect_count", KSTAT_DATA_UINT64 },
	{ "memory_all_bytes", KSTAT_DATA_UINT64 },
	{ "memory_free_bytes", KSTAT_DATA_UINT64 },
	{ "memory_available_bytes", KSTAT_DATA_INT64 },
	{ "arc_no_grow", KSTAT_DATA_UINT64 },
	{ "arc_tempreserve", KSTAT_DATA_UINT64 },
	{ "arc_loaned_bytes", KSTAT_DATA_UINT64 },
	{ "arc_prune", KSTAT_DATA_UINT64 },
	{ "arc_meta_used", KSTAT_DATA_UINT64 },
	{ "arc_meta_limit", KSTAT_DATA_UINT64 },
	{ "arc_dnode_limit", KSTAT_DATA_UINT64 },
	{ "arc_meta_max", KSTAT_DATA_UINT64 },
	{ "arc_meta_min", KSTAT_DATA_UINT64 },
	{ "async_upgrade_sync", KSTAT_DATA_UINT64 },
	{ "demand_hit_predictive_prefetch", KSTAT_DATA_UINT64 },
	{ "demand_hit_prescient_prefetch", KSTAT_DATA_UINT64 },
	{ "arc_need_free", KSTAT_DATA_UINT64 },
	{ "arc_sys_free", KSTAT_DATA_UINT64 },
	{ "arc_raw_size", KSTAT_DATA_UINT64 },
	{ "cached_only_in_progress", KSTAT_DATA_UINT64 },
	{ "abd_chunk_waste_size", KSTAT_DATA_UINT64 },
	};

	arc_sums_t arc_sums;

	#define ARCSTAT_MAX(stat, val) { \
	uint64_t m; \
	while ((val) > (m = arc_stats.stat.value.ui64) && \
	(m != atomic_cas_64(&arc_stats.stat.value.ui64, m, (val)))) \
	continue; \
	}

	/*
	* We define a macro to allow ARC hits/misses to be easily broken down by
	* two separate conditions, giving a total of four different subtypes for
	* each of hits and misses (so eight statistics total).
	*/
	#define ARCSTAT_CONDSTAT(cond1, stat1, notstat1, cond2, stat2, notstat2, stat) \
	if (cond1) { \
	if (cond2) { \
	ARCSTAT_BUMP(arcstat_##stat1##_##stat2##_##stat); \
	} else { \
	ARCSTAT_BUMP(arcstat_##stat1##_##notstat2##_##stat); \
	} \
	} else { \
	if (cond2) { \
	ARCSTAT_BUMP(arcstat_##notstat1##_##stat2##_##stat); \
	} else { \
	ARCSTAT_BUMP(arcstat_##notstat1##_##notstat2##_##stat);\
	} \
	}

	/*
	* This macro allows us to use kstats as floating averages. Each time we
	* update this kstat, we first factor it and the update value by
	* ARCSTAT_AVG_FACTOR to shrink the new value's contribution to the overall
	* average. This macro assumes that integer loads and stores are atomic, but
	* is not safe for multiple writers updating the kstat in parallel (only the
	* last writer's update will remain).
	*/
	#define ARCSTAT_F_AVG_FACTOR 3
	#define ARCSTAT_F_AVG(stat, value) \
	do { \
	uint64_t x = ARCSTAT(stat); \
	x = x - x / ARCSTAT_F_AVG_FACTOR + \
	(value) / ARCSTAT_F_AVG_FACTOR; \
	ARCSTAT(stat) = x; \
	_NOTE(CONSTCOND) \
	} while (0)

	kstat_t *arc_ksp;
	-static arc_state_t *arc_anon;
	-static arc_state_t *arc_mru_ghost;
	-static arc_state_t *arc_mfu_ghost;
	-static arc_state_t *arc_l2c_only;
	-
	-arc_state_t *arc_mru;
	-arc_state_t *arc_mfu;

	/*
	* There are several ARC variables that are critical to export as kstats --
	* but we don't want to have to grovel around in the kstat whenever we wish to
	* manipulate them. For these variables, we therefore define them to be in
	* terms of the statistic variable. This assures that we are not introducing
	* the possibility of inconsistency by having shadow copies of the variables,
	* while still allowing the code to be readable.
	*/
	#define arc_tempreserve ARCSTAT(arcstat_tempreserve)
	#define arc_loaned_bytes ARCSTAT(arcstat_loaned_bytes)
	#define arc_meta_limit ARCSTAT(arcstat_meta_limit) /* max size for metadata */
	/* max size for dnodes */
	#define arc_dnode_size_limit ARCSTAT(arcstat_dnode_limit)
	#define arc_meta_min ARCSTAT(arcstat_meta_min) /* min size for metadata */
	#define arc_need_free ARCSTAT(arcstat_need_free) /* waiting to be evicted */

	hrtime_t arc_growtime;
	list_t arc_prune_list;
	kmutex_t arc_prune_mtx;
	taskq_t *arc_prune_taskq;

	#define GHOST_STATE(state) \
	((state) == arc_mru_ghost \|\| (state) == arc_mfu_ghost \|\| \
	(state) == arc_l2c_only)

	#define HDR_IN_HASH_TABLE(hdr) ((hdr)->b_flags & ARC_FLAG_IN_HASH_TABLE)
	#define HDR_IO_IN_PROGRESS(hdr) ((hdr)->b_flags & ARC_FLAG_IO_IN_PROGRESS)
	#define HDR_IO_ERROR(hdr) ((hdr)->b_flags & ARC_FLAG_IO_ERROR)
	#define HDR_PREFETCH(hdr) ((hdr)->b_flags & ARC_FLAG_PREFETCH)
	#define HDR_PRESCIENT_PREFETCH(hdr) \
	((hdr)->b_flags & ARC_FLAG_PRESCIENT_PREFETCH)
	#define HDR_COMPRESSION_ENABLED(hdr) \
	((hdr)->b_flags & ARC_FLAG_COMPRESSED_ARC)

	#define HDR_L2CACHE(hdr) ((hdr)->b_flags & ARC_FLAG_L2CACHE)
	#define HDR_L2_READING(hdr) \
	(((hdr)->b_flags & ARC_FLAG_IO_IN_PROGRESS) && \
	((hdr)->b_flags & ARC_FLAG_HAS_L2HDR))
	#define HDR_L2_WRITING(hdr) ((hdr)->b_flags & ARC_FLAG_L2_WRITING)
	#define HDR_L2_EVICTED(hdr) ((hdr)->b_flags & ARC_FLAG_L2_EVICTED)
	#define HDR_L2_WRITE_HEAD(hdr) ((hdr)->b_flags & ARC_FLAG_L2_WRITE_HEAD)
	#define HDR_PROTECTED(hdr) ((hdr)->b_flags & ARC_FLAG_PROTECTED)
	#define HDR_NOAUTH(hdr) ((hdr)->b_flags & ARC_FLAG_NOAUTH)
	#define HDR_SHARED_DATA(hdr) ((hdr)->b_flags & ARC_FLAG_SHARED_DATA)

	#define HDR_ISTYPE_METADATA(hdr) \
	((hdr)->b_flags & ARC_FLAG_BUFC_METADATA)
	#define HDR_ISTYPE_DATA(hdr) (!HDR_ISTYPE_METADATA(hdr))

	#define HDR_HAS_L1HDR(hdr) ((hdr)->b_flags & ARC_FLAG_HAS_L1HDR)
	#define HDR_HAS_L2HDR(hdr) ((hdr)->b_flags & ARC_FLAG_HAS_L2HDR)
	#define HDR_HAS_RABD(hdr) \
	(HDR_HAS_L1HDR(hdr) && HDR_PROTECTED(hdr) && \
	(hdr)->b_crypt_hdr.b_rabd != NULL)
	#define HDR_ENCRYPTED(hdr) \
	(HDR_PROTECTED(hdr) && DMU_OT_IS_ENCRYPTED((hdr)->b_crypt_hdr.b_ot))
	#define HDR_AUTHENTICATED(hdr) \
	(HDR_PROTECTED(hdr) && !DMU_OT_IS_ENCRYPTED((hdr)->b_crypt_hdr.b_ot))

	/* For storing compression mode in b_flags */
	#define HDR_COMPRESS_OFFSET (highbit64(ARC_FLAG_COMPRESS_0) - 1)

	#define HDR_GET_COMPRESS(hdr) ((enum zio_compress)BF32_GET((hdr)->b_flags, \
	HDR_COMPRESS_OFFSET, SPA_COMPRESSBITS))
	#define HDR_SET_COMPRESS(hdr, cmp) BF32_SET((hdr)->b_flags, \
	HDR_COMPRESS_OFFSET, SPA_COMPRESSBITS, (cmp));

	#define ARC_BUF_LAST(buf) ((buf)->b_next == NULL)
	#define ARC_BUF_SHARED(buf) ((buf)->b_flags & ARC_BUF_FLAG_SHARED)
	#define ARC_BUF_COMPRESSED(buf) ((buf)->b_flags & ARC_BUF_FLAG_COMPRESSED)
	#define ARC_BUF_ENCRYPTED(buf) ((buf)->b_flags & ARC_BUF_FLAG_ENCRYPTED)

	/*
	* Other sizes
	*/

	#define HDR_FULL_CRYPT_SIZE ((int64_t)sizeof (arc_buf_hdr_t))
	#define HDR_FULL_SIZE ((int64_t)offsetof(arc_buf_hdr_t, b_crypt_hdr))
	#define HDR_L2ONLY_SIZE ((int64_t)offsetof(arc_buf_hdr_t, b_l1hdr))

	/*
	* Hash table routines
	*/

	-#define HT_LOCK_ALIGN 64
	-#define HT_LOCK_PAD (P2NPHASE(sizeof (kmutex_t), (HT_LOCK_ALIGN)))
	-
	-struct ht_lock {
	- kmutex_t ht_lock;
	-#ifdef _KERNEL
	- unsigned char pad[HT_LOCK_PAD];
	-#endif
	-};
	-
	-#define BUF_LOCKS 8192
	+#define BUF_LOCKS 2048
	typedef struct buf_hash_table {
	uint64_t ht_mask;
	arc_buf_hdr_t **ht_table;
	- struct ht_lock ht_locks[BUF_LOCKS];
	+ kmutex_t ht_locks[BUF_LOCKS] ____cacheline_aligned;
	} buf_hash_table_t;

	static buf_hash_table_t buf_hash_table;

	#define BUF_HASH_INDEX(spa, dva, birth) \
	(buf_hash(spa, dva, birth) & buf_hash_table.ht_mask)
	-#define BUF_HASH_LOCK_NTRY(idx) (buf_hash_table.ht_locks[idx & (BUF_LOCKS-1)])
	-#define BUF_HASH_LOCK(idx) (&(BUF_HASH_LOCK_NTRY(idx).ht_lock))
	+#define BUF_HASH_LOCK(idx) (&buf_hash_table.ht_locks[idx & (BUF_LOCKS-1)])
	#define HDR_LOCK(hdr) \
	(BUF_HASH_LOCK(BUF_HASH_INDEX(hdr->b_spa, &hdr->b_dva, hdr->b_birth)))

	uint64_t zfs_crc64_table[256];

	/*
	* Level 2 ARC
	*/

	#define L2ARC_WRITE_SIZE (8 * 1024 * 1024) /* initial write max */
	#define L2ARC_HEADROOM 2 /* num of writes */

	/*
	* If we discover during ARC scan any buffers to be compressed, we boost
	* our headroom for the next scanning cycle by this percentage multiple.
	*/
	#define L2ARC_HEADROOM_BOOST 200
	#define L2ARC_FEED_SECS 1 /* caching interval secs */
	#define L2ARC_FEED_MIN_MS 200 /* min caching interval ms */

	/*
	* We can feed L2ARC from two states of ARC buffers, mru and mfu,
	* and each of the state has two types: data and metadata.
	*/
	#define L2ARC_FEED_TYPES 4

	/* L2ARC Performance Tunables */
	unsigned long l2arc_write_max = L2ARC_WRITE_SIZE; /* def max write size */
	unsigned long l2arc_write_boost = L2ARC_WRITE_SIZE; /* extra warmup write */
	unsigned long l2arc_headroom = L2ARC_HEADROOM; /* # of dev writes */
	unsigned long l2arc_headroom_boost = L2ARC_HEADROOM_BOOST;
	unsigned long l2arc_feed_secs = L2ARC_FEED_SECS; /* interval seconds */
	unsigned long l2arc_feed_min_ms = L2ARC_FEED_MIN_MS; /* min interval msecs */
	int l2arc_noprefetch = B_TRUE; /* don't cache prefetch bufs */
	int l2arc_feed_again = B_TRUE; /* turbo warmup */
	int l2arc_norw = B_FALSE; /* no reads during writes */
	int l2arc_meta_percent = 33; /* limit on headers size */

	/*
	* L2ARC Internals
	*/
	static list_t L2ARC_dev_list; /* device list */
	static list_t l2arc_dev_list; / device list pointer */
	static kmutex_t l2arc_dev_mtx; /* device list mutex */
	static l2arc_dev_t l2arc_dev_last; / last device used */
	static list_t L2ARC_free_on_write; /* free after write buf list */
	static list_t l2arc_free_on_write; / free after write list ptr */
	static kmutex_t l2arc_free_on_write_mtx; /* mutex for list */
	static uint64_t l2arc_ndev; /* number of devices */

	typedef struct l2arc_read_callback {
	arc_buf_hdr_t l2rcb_hdr; / read header */
	blkptr_t l2rcb_bp; /* original blkptr */
	zbookmark_phys_t l2rcb_zb; /* original bookmark */
	int l2rcb_flags; /* original flags */
	abd_t l2rcb_abd; / temporary buffer */
	} l2arc_read_callback_t;

	typedef struct l2arc_data_free {
	/* protected by l2arc_free_on_write_mtx */
	abd_t *l2df_abd;
	size_t l2df_size;
	arc_buf_contents_t l2df_type;
	list_node_t l2df_list_node;
	} l2arc_data_free_t;

	typedef enum arc_fill_flags {
	ARC_FILL_LOCKED = 1 << 0, /* hdr lock is held */
	ARC_FILL_COMPRESSED = 1 << 1, /* fill with compressed data */
	ARC_FILL_ENCRYPTED = 1 << 2, /* fill with encrypted data */
	ARC_FILL_NOAUTH = 1 << 3, /* don't attempt to authenticate */
	ARC_FILL_IN_PLACE = 1 << 4 /* fill in place (special case) */
	} arc_fill_flags_t;

	+typedef enum arc_ovf_level {
	+ ARC_OVF_NONE, /* ARC within target size. */
	+ ARC_OVF_SOME, /* ARC is slightly overflowed. */
	+ ARC_OVF_SEVERE /* ARC is severely overflowed. */
	+} arc_ovf_level_t;
	+
	static kmutex_t l2arc_feed_thr_lock;
	static kcondvar_t l2arc_feed_thr_cv;
	static uint8_t l2arc_thread_exit;

	static kmutex_t l2arc_rebuild_thr_lock;
	static kcondvar_t l2arc_rebuild_thr_cv;

	enum arc_hdr_alloc_flags {
	ARC_HDR_ALLOC_RDATA = 0x1,
	ARC_HDR_DO_ADAPT = 0x2,
	+ ARC_HDR_USE_RESERVE = 0x4,
	};


	-static abd_t arc_get_data_abd(arc_buf_hdr_t , uint64_t, void *, boolean_t);
	+static abd_t arc_get_data_abd(arc_buf_hdr_t , uint64_t, void *, int);
	static void arc_get_data_buf(arc_buf_hdr_t , uint64_t, void *);
	-static void arc_get_data_impl(arc_buf_hdr_t , uint64_t, void , boolean_t);
	+static void arc_get_data_impl(arc_buf_hdr_t , uint64_t, void , int);
	static void arc_free_data_abd(arc_buf_hdr_t , abd_t , uint64_t, void *);
	static void arc_free_data_buf(arc_buf_hdr_t , void , uint64_t, void *);
	static void arc_free_data_impl(arc_buf_hdr_t hdr, uint64_t size, void tag);
	static void arc_hdr_free_abd(arc_buf_hdr_t *, boolean_t);
	static void arc_hdr_alloc_abd(arc_buf_hdr_t *, int);
	static void arc_access(arc_buf_hdr_t , kmutex_t );
	static void arc_buf_watch(arc_buf_t *);

	static arc_buf_contents_t arc_buf_type(arc_buf_hdr_t *);
	static uint32_t arc_bufc_to_flags(arc_buf_contents_t);
	static inline void arc_hdr_set_flags(arc_buf_hdr_t *hdr, arc_flags_t flags);
	static inline void arc_hdr_clear_flags(arc_buf_hdr_t *hdr, arc_flags_t flags);

	static boolean_t l2arc_write_eligible(uint64_t, arc_buf_hdr_t *);
	static void l2arc_read_done(zio_t *);
	static void l2arc_do_free_on_write(void);
	static void l2arc_hdr_arcstats_update(arc_buf_hdr_t *hdr, boolean_t incr,
	boolean_t state_only);

	#define l2arc_hdr_arcstats_increment(hdr) \
	l2arc_hdr_arcstats_update((hdr), B_TRUE, B_FALSE)
	#define l2arc_hdr_arcstats_decrement(hdr) \
	l2arc_hdr_arcstats_update((hdr), B_FALSE, B_FALSE)
	#define l2arc_hdr_arcstats_increment_state(hdr) \
	l2arc_hdr_arcstats_update((hdr), B_TRUE, B_TRUE)
	#define l2arc_hdr_arcstats_decrement_state(hdr) \
	l2arc_hdr_arcstats_update((hdr), B_FALSE, B_TRUE)

	/*
	* l2arc_mfuonly : A ZFS module parameter that controls whether only MFU
	* metadata and data are cached from ARC into L2ARC.
	*/
	int l2arc_mfuonly = 0;

	/*
	* L2ARC TRIM
	* l2arc_trim_ahead : A ZFS module parameter that controls how much ahead of
	* the current write size (l2arc_write_max) we should TRIM if we
	* have filled the device. It is defined as a percentage of the
	* write size. If set to 100 we trim twice the space required to
	* accommodate upcoming writes. A minimum of 64MB will be trimmed.
	* It also enables TRIM of the whole L2ARC device upon creation or
	* addition to an existing pool or if the header of the device is
	* invalid upon importing a pool or onlining a cache device. The
	* default is 0, which disables TRIM on L2ARC altogether as it can
	* put significant stress on the underlying storage devices. This
	* will vary depending of how well the specific device handles
	* these commands.
	*/
	unsigned long l2arc_trim_ahead = 0;

	/*
	* Performance tuning of L2ARC persistence:
	*
	* l2arc_rebuild_enabled : A ZFS module parameter that controls whether adding
	* an L2ARC device (either at pool import or later) will attempt
	* to rebuild L2ARC buffer contents.
	* l2arc_rebuild_blocks_min_l2size : A ZFS module parameter that controls
	* whether log blocks are written to the L2ARC device. If the L2ARC
	* device is less than 1GB, the amount of data l2arc_evict()
	* evicts is significant compared to the amount of restored L2ARC
	* data. In this case do not write log blocks in L2ARC in order
	* not to waste space.
	*/
	int l2arc_rebuild_enabled = B_TRUE;
	unsigned long l2arc_rebuild_blocks_min_l2size = 1024 * 1024 * 1024;

	/* L2ARC persistence rebuild control routines. */
	void l2arc_rebuild_vdev(vdev_t *vd, boolean_t reopen);
	static void l2arc_dev_rebuild_thread(void *arg);
	static int l2arc_rebuild(l2arc_dev_t *dev);

	/* L2ARC persistence read I/O routines. */
	static int l2arc_dev_hdr_read(l2arc_dev_t *dev);
	static int l2arc_log_blk_read(l2arc_dev_t *dev,
	const l2arc_log_blkptr_t this_lp, const l2arc_log_blkptr_t next_lp,
	l2arc_log_blk_phys_t this_lb, l2arc_log_blk_phys_t next_lb,
	zio_t this_io, zio_t *next_io);
	static zio_t l2arc_log_blk_fetch(vdev_t vd,
	const l2arc_log_blkptr_t lp, l2arc_log_blk_phys_t lb);
	static void l2arc_log_blk_fetch_abort(zio_t *zio);

	/* L2ARC persistence block restoration routines. */
	static void l2arc_log_blk_restore(l2arc_dev_t *dev,
	const l2arc_log_blk_phys_t *lb, uint64_t lb_asize);
	static void l2arc_hdr_restore(const l2arc_log_ent_phys_t *le,
	l2arc_dev_t *dev);

	/* L2ARC persistence write I/O routines. */
	static void l2arc_log_blk_commit(l2arc_dev_t dev, zio_t pio,
	l2arc_write_callback_t *cb);

	/* L2ARC persistence auxiliary routines. */
	boolean_t l2arc_log_blkptr_valid(l2arc_dev_t *dev,
	const l2arc_log_blkptr_t *lbp);
	static boolean_t l2arc_log_blk_insert(l2arc_dev_t *dev,
	const arc_buf_hdr_t *ab);
	boolean_t l2arc_range_check_overlap(uint64_t bottom,
	uint64_t top, uint64_t check);
	static void l2arc_blk_fetch_done(zio_t *zio);
	static inline uint64_t
	l2arc_log_blk_overhead(uint64_t write_sz, l2arc_dev_t *dev);

	/*
	* We use Cityhash for this. It's fast, and has good hash properties without
	* requiring any large static buffers.
	*/
	static uint64_t
	buf_hash(uint64_t spa, const dva_t *dva, uint64_t birth)
	{
	return (cityhash4(spa, dva->dva_word[0], dva->dva_word[1], birth));
	}

	#define HDR_EMPTY(hdr) \
	((hdr)->b_dva.dva_word[0] == 0 && \
	(hdr)->b_dva.dva_word[1] == 0)

	#define HDR_EMPTY_OR_LOCKED(hdr) \
	(HDR_EMPTY(hdr) \|\| MUTEX_HELD(HDR_LOCK(hdr)))

	#define HDR_EQUAL(spa, dva, birth, hdr) \
	((hdr)->b_dva.dva_word[0] == (dva)->dva_word[0]) && \
	((hdr)->b_dva.dva_word[1] == (dva)->dva_word[1]) && \
	((hdr)->b_birth == birth) && ((hdr)->b_spa == spa)

	static void
	buf_discard_identity(arc_buf_hdr_t *hdr)
	{
	hdr->b_dva.dva_word[0] = 0;
	hdr->b_dva.dva_word[1] = 0;
	hdr->b_birth = 0;
	}

	static arc_buf_hdr_t *
	buf_hash_find(uint64_t spa, const blkptr_t bp, kmutex_t *lockp)
	{
	const dva_t *dva = BP_IDENTITY(bp);
	uint64_t birth = BP_PHYSICAL_BIRTH(bp);
	uint64_t idx = BUF_HASH_INDEX(spa, dva, birth);
	kmutex_t *hash_lock = BUF_HASH_LOCK(idx);
	arc_buf_hdr_t *hdr;

	mutex_enter(hash_lock);
	for (hdr = buf_hash_table.ht_table[idx]; hdr != NULL;
	hdr = hdr->b_hash_next) {
	if (HDR_EQUAL(spa, dva, birth, hdr)) {
	*lockp = hash_lock;
	return (hdr);
	}
	}
	mutex_exit(hash_lock);
	*lockp = NULL;
	return (NULL);
	}

	/*
	* Insert an entry into the hash table. If there is already an element
	* equal to elem in the hash table, then the already existing element
	* will be returned and the new element will not be inserted.
	* Otherwise returns NULL.
	* If lockp == NULL, the caller is assumed to already hold the hash lock.
	*/
	static arc_buf_hdr_t *
	buf_hash_insert(arc_buf_hdr_t hdr, kmutex_t *lockp)
	{
	uint64_t idx = BUF_HASH_INDEX(hdr->b_spa, &hdr->b_dva, hdr->b_birth);
	kmutex_t *hash_lock = BUF_HASH_LOCK(idx);
	arc_buf_hdr_t *fhdr;
	uint32_t i;

	ASSERT(!DVA_IS_EMPTY(&hdr->b_dva));
	ASSERT(hdr->b_birth != 0);
	ASSERT(!HDR_IN_HASH_TABLE(hdr));

	if (lockp != NULL) {
	*lockp = hash_lock;
	mutex_enter(hash_lock);
	} else {
	ASSERT(MUTEX_HELD(hash_lock));
	}

	for (fhdr = buf_hash_table.ht_table[idx], i = 0; fhdr != NULL;
	fhdr = fhdr->b_hash_next, i++) {
	if (HDR_EQUAL(hdr->b_spa, &hdr->b_dva, hdr->b_birth, fhdr))
	return (fhdr);
	}

	hdr->b_hash_next = buf_hash_table.ht_table[idx];
	buf_hash_table.ht_table[idx] = hdr;
	arc_hdr_set_flags(hdr, ARC_FLAG_IN_HASH_TABLE);

	/* collect some hash table performance data */
	if (i > 0) {
	ARCSTAT_BUMP(arcstat_hash_collisions);
	if (i == 1)
	ARCSTAT_BUMP(arcstat_hash_chains);

	ARCSTAT_MAX(arcstat_hash_chain_max, i);
	}
	uint64_t he = atomic_inc_64_nv(
	&arc_stats.arcstat_hash_elements.value.ui64);
	ARCSTAT_MAX(arcstat_hash_elements_max, he);

	return (NULL);
	}

	static void
	buf_hash_remove(arc_buf_hdr_t *hdr)
	{
	arc_buf_hdr_t fhdr, *hdrp;
	uint64_t idx = BUF_HASH_INDEX(hdr->b_spa, &hdr->b_dva, hdr->b_birth);

	ASSERT(MUTEX_HELD(BUF_HASH_LOCK(idx)));
	ASSERT(HDR_IN_HASH_TABLE(hdr));

	hdrp = &buf_hash_table.ht_table[idx];
	while ((fhdr = *hdrp) != hdr) {
	ASSERT3P(fhdr, !=, NULL);
	hdrp = &fhdr->b_hash_next;
	}
	*hdrp = hdr->b_hash_next;
	hdr->b_hash_next = NULL;
	arc_hdr_clear_flags(hdr, ARC_FLAG_IN_HASH_TABLE);

	/* collect some hash table performance data */
	atomic_dec_64(&arc_stats.arcstat_hash_elements.value.ui64);

	if (buf_hash_table.ht_table[idx] &&
	buf_hash_table.ht_table[idx]->b_hash_next == NULL)
	ARCSTAT_BUMPDOWN(arcstat_hash_chains);
	}

	/*
	* Global data structures and functions for the buf kmem cache.
	*/

	static kmem_cache_t *hdr_full_cache;
	static kmem_cache_t *hdr_full_crypt_cache;
	static kmem_cache_t *hdr_l2only_cache;
	static kmem_cache_t *buf_cache;

	static void
	buf_fini(void)
	{
	int i;

	#if defined(_KERNEL)
	/*
	* Large allocations which do not require contiguous pages
	* should be using vmem_free() in the linux kernel\
	*/
	vmem_free(buf_hash_table.ht_table,
	(buf_hash_table.ht_mask + 1) * sizeof (void *));
	#else
	kmem_free(buf_hash_table.ht_table,
	(buf_hash_table.ht_mask + 1) * sizeof (void *));
	#endif
	for (i = 0; i < BUF_LOCKS; i++)
	- mutex_destroy(&buf_hash_table.ht_locks[i].ht_lock);
	+ mutex_destroy(BUF_HASH_LOCK(i));
	kmem_cache_destroy(hdr_full_cache);
	kmem_cache_destroy(hdr_full_crypt_cache);
	kmem_cache_destroy(hdr_l2only_cache);
	kmem_cache_destroy(buf_cache);
	}

	/*
	* Constructor callback - called when the cache is empty
	* and a new buf is requested.
	*/
	/* ARGSUSED */
	static int
	hdr_full_cons(void vbuf, void unused, int kmflag)
	{
	arc_buf_hdr_t *hdr = vbuf;

	bzero(hdr, HDR_FULL_SIZE);
	hdr->b_l1hdr.b_byteswap = DMU_BSWAP_NUMFUNCS;
	cv_init(&hdr->b_l1hdr.b_cv, NULL, CV_DEFAULT, NULL);
	zfs_refcount_create(&hdr->b_l1hdr.b_refcnt);
	mutex_init(&hdr->b_l1hdr.b_freeze_lock, NULL, MUTEX_DEFAULT, NULL);
	list_link_init(&hdr->b_l1hdr.b_arc_node);
	list_link_init(&hdr->b_l2hdr.b_l2node);
	multilist_link_init(&hdr->b_l1hdr.b_arc_node);
	arc_space_consume(HDR_FULL_SIZE, ARC_SPACE_HDRS);

	return (0);
	}

	/* ARGSUSED */
	static int
	hdr_full_crypt_cons(void vbuf, void unused, int kmflag)
	{
	arc_buf_hdr_t *hdr = vbuf;

	hdr_full_cons(vbuf, unused, kmflag);
	bzero(&hdr->b_crypt_hdr, sizeof (hdr->b_crypt_hdr));
	arc_space_consume(sizeof (hdr->b_crypt_hdr), ARC_SPACE_HDRS);

	return (0);
	}

	/* ARGSUSED */
	static int
	hdr_l2only_cons(void vbuf, void unused, int kmflag)
	{
	arc_buf_hdr_t *hdr = vbuf;

	bzero(hdr, HDR_L2ONLY_SIZE);
	arc_space_consume(HDR_L2ONLY_SIZE, ARC_SPACE_L2HDRS);

	return (0);
	}

	/* ARGSUSED */
	static int
	buf_cons(void vbuf, void unused, int kmflag)
	{
	arc_buf_t *buf = vbuf;

	bzero(buf, sizeof (arc_buf_t));
	mutex_init(&buf->b_evict_lock, NULL, MUTEX_DEFAULT, NULL);
	arc_space_consume(sizeof (arc_buf_t), ARC_SPACE_HDRS);

	return (0);
	}

	/*
	* Destructor callback - called when a cached buf is
	* no longer required.
	*/
	/* ARGSUSED */
	static void
	hdr_full_dest(void vbuf, void unused)
	{
	arc_buf_hdr_t *hdr = vbuf;

	ASSERT(HDR_EMPTY(hdr));
	cv_destroy(&hdr->b_l1hdr.b_cv);
	zfs_refcount_destroy(&hdr->b_l1hdr.b_refcnt);
	mutex_destroy(&hdr->b_l1hdr.b_freeze_lock);
	ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
	arc_space_return(HDR_FULL_SIZE, ARC_SPACE_HDRS);
	}

	/* ARGSUSED */
	static void
	hdr_full_crypt_dest(void vbuf, void unused)
	{
	arc_buf_hdr_t *hdr = vbuf;

	hdr_full_dest(vbuf, unused);
	arc_space_return(sizeof (hdr->b_crypt_hdr), ARC_SPACE_HDRS);
	}

	/* ARGSUSED */
	static void
	hdr_l2only_dest(void vbuf, void unused)
	{
	arc_buf_hdr_t *hdr __maybe_unused = vbuf;

	ASSERT(HDR_EMPTY(hdr));
	arc_space_return(HDR_L2ONLY_SIZE, ARC_SPACE_L2HDRS);
	}

	/* ARGSUSED */
	static void
	buf_dest(void vbuf, void unused)
	{
	arc_buf_t *buf = vbuf;

	mutex_destroy(&buf->b_evict_lock);
	arc_space_return(sizeof (arc_buf_t), ARC_SPACE_HDRS);
	}

	static void
	buf_init(void)
	{
	uint64_t *ct = NULL;
	uint64_t hsize = 1ULL << 12;
	int i, j;

	/*
	* The hash table is big enough to fill all of physical memory
	* with an average block size of zfs_arc_average_blocksize (default 8K).
	* By default, the table will take up
	* totalmem * sizeof(void*) / 8K (1MB per GB with 8-byte pointers).
	*/
	while (hsize * zfs_arc_average_blocksize < arc_all_memory())
	hsize <<= 1;
	retry:
	buf_hash_table.ht_mask = hsize - 1;
	#if defined(_KERNEL)
	/*
	* Large allocations which do not require contiguous pages
	* should be using vmem_alloc() in the linux kernel
	*/
	buf_hash_table.ht_table =
	vmem_zalloc(hsize * sizeof (void*), KM_SLEEP);
	#else
	buf_hash_table.ht_table =
	kmem_zalloc(hsize * sizeof (void*), KM_NOSLEEP);
	#endif
	if (buf_hash_table.ht_table == NULL) {
	ASSERT(hsize > (1ULL << 8));
	hsize >>= 1;
	goto retry;
	}

	hdr_full_cache = kmem_cache_create("arc_buf_hdr_t_full", HDR_FULL_SIZE,
	0, hdr_full_cons, hdr_full_dest, NULL, NULL, NULL, 0);
	hdr_full_crypt_cache = kmem_cache_create("arc_buf_hdr_t_full_crypt",
	HDR_FULL_CRYPT_SIZE, 0, hdr_full_crypt_cons, hdr_full_crypt_dest,
	NULL, NULL, NULL, 0);
	hdr_l2only_cache = kmem_cache_create("arc_buf_hdr_t_l2only",
	HDR_L2ONLY_SIZE, 0, hdr_l2only_cons, hdr_l2only_dest, NULL,
	NULL, NULL, 0);
	buf_cache = kmem_cache_create("arc_buf_t", sizeof (arc_buf_t),
	0, buf_cons, buf_dest, NULL, NULL, NULL, 0);

	for (i = 0; i < 256; i++)
	for (ct = zfs_crc64_table + i, *ct = i, j = 8; j > 0; j--)
	ct = (ct >> 1) ^ (-(*ct & 1) & ZFS_CRC64_POLY);

	- for (i = 0; i < BUF_LOCKS; i++) {
	- mutex_init(&buf_hash_table.ht_locks[i].ht_lock,
	- NULL, MUTEX_DEFAULT, NULL);
	- }
	+ for (i = 0; i < BUF_LOCKS; i++)
	+ mutex_init(BUF_HASH_LOCK(i), NULL, MUTEX_DEFAULT, NULL);
	}

	#define ARC_MINTIME (hz>>4) /* 62 ms */

	/*
	* This is the size that the buf occupies in memory. If the buf is compressed,
	* it will correspond to the compressed size. You should use this method of
	* getting the buf size unless you explicitly need the logical size.
	*/
	uint64_t
	arc_buf_size(arc_buf_t *buf)
	{
	return (ARC_BUF_COMPRESSED(buf) ?
	HDR_GET_PSIZE(buf->b_hdr) : HDR_GET_LSIZE(buf->b_hdr));
	}

	uint64_t
	arc_buf_lsize(arc_buf_t *buf)
	{
	return (HDR_GET_LSIZE(buf->b_hdr));
	}

	/*
	* This function will return B_TRUE if the buffer is encrypted in memory.
	* This buffer can be decrypted by calling arc_untransform().
	*/
	boolean_t
	arc_is_encrypted(arc_buf_t *buf)
	{
	return (ARC_BUF_ENCRYPTED(buf) != 0);
	}

	/*
	* Returns B_TRUE if the buffer represents data that has not had its MAC
	* verified yet.
	*/
	boolean_t
	arc_is_unauthenticated(arc_buf_t *buf)
	{
	return (HDR_NOAUTH(buf->b_hdr) != 0);
	}

	void
	arc_get_raw_params(arc_buf_t buf, boolean_t byteorder, uint8_t *salt,
	uint8_t iv, uint8_t mac)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	ASSERT(HDR_PROTECTED(hdr));

	bcopy(hdr->b_crypt_hdr.b_salt, salt, ZIO_DATA_SALT_LEN);
	bcopy(hdr->b_crypt_hdr.b_iv, iv, ZIO_DATA_IV_LEN);
	bcopy(hdr->b_crypt_hdr.b_mac, mac, ZIO_DATA_MAC_LEN);
	*byteorder = (hdr->b_l1hdr.b_byteswap == DMU_BSWAP_NUMFUNCS) ?
	ZFS_HOST_BYTEORDER : !ZFS_HOST_BYTEORDER;
	}

	/*
	* Indicates how this buffer is compressed in memory. If it is not compressed
	* the value will be ZIO_COMPRESS_OFF. It can be made normally readable with
	* arc_untransform() as long as it is also unencrypted.
	*/
	enum zio_compress
	arc_get_compression(arc_buf_t *buf)
	{
	return (ARC_BUF_COMPRESSED(buf) ?
	HDR_GET_COMPRESS(buf->b_hdr) : ZIO_COMPRESS_OFF);
	}

	/*
	* Return the compression algorithm used to store this data in the ARC. If ARC
	* compression is enabled or this is an encrypted block, this will be the same
	* as what's used to store it on-disk. Otherwise, this will be ZIO_COMPRESS_OFF.
	*/
	static inline enum zio_compress
	arc_hdr_get_compress(arc_buf_hdr_t *hdr)
	{
	return (HDR_COMPRESSION_ENABLED(hdr) ?
	HDR_GET_COMPRESS(hdr) : ZIO_COMPRESS_OFF);
	}

	uint8_t
	arc_get_complevel(arc_buf_t *buf)
	{
	return (buf->b_hdr->b_complevel);
	}

	static inline boolean_t
	arc_buf_is_shared(arc_buf_t *buf)
	{
	boolean_t shared = (buf->b_data != NULL &&
	buf->b_hdr->b_l1hdr.b_pabd != NULL &&
	abd_is_linear(buf->b_hdr->b_l1hdr.b_pabd) &&
	buf->b_data == abd_to_buf(buf->b_hdr->b_l1hdr.b_pabd));
	IMPLY(shared, HDR_SHARED_DATA(buf->b_hdr));
	IMPLY(shared, ARC_BUF_SHARED(buf));
	IMPLY(shared, ARC_BUF_COMPRESSED(buf) \|\| ARC_BUF_LAST(buf));

	/*
	* It would be nice to assert arc_can_share() too, but the "hdr isn't
	* already being shared" requirement prevents us from doing that.
	*/

	return (shared);
	}

	/*
	* Free the checksum associated with this header. If there is no checksum, this
	* is a no-op.
	*/
	static inline void
	arc_cksum_free(arc_buf_hdr_t *hdr)
	{
	ASSERT(HDR_HAS_L1HDR(hdr));

	mutex_enter(&hdr->b_l1hdr.b_freeze_lock);
	if (hdr->b_l1hdr.b_freeze_cksum != NULL) {
	kmem_free(hdr->b_l1hdr.b_freeze_cksum, sizeof (zio_cksum_t));
	hdr->b_l1hdr.b_freeze_cksum = NULL;
	}
	mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
	}

	/*
	* Return true iff at least one of the bufs on hdr is not compressed.
	* Encrypted buffers count as compressed.
	*/
	static boolean_t
	arc_hdr_has_uncompressed_buf(arc_buf_hdr_t *hdr)
	{
	ASSERT(hdr->b_l1hdr.b_state == arc_anon \|\| HDR_EMPTY_OR_LOCKED(hdr));

	for (arc_buf_t *b = hdr->b_l1hdr.b_buf; b != NULL; b = b->b_next) {
	if (!ARC_BUF_COMPRESSED(b)) {
	return (B_TRUE);
	}
	}
	return (B_FALSE);
	}


	/*
	* If we've turned on the ZFS_DEBUG_MODIFY flag, verify that the buf's data
	* matches the checksum that is stored in the hdr. If there is no checksum,
	* or if the buf is compressed, this is a no-op.
	*/
	static void
	arc_cksum_verify(arc_buf_t *buf)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;
	zio_cksum_t zc;

	if (!(zfs_flags & ZFS_DEBUG_MODIFY))
	return;

	if (ARC_BUF_COMPRESSED(buf))
	return;

	ASSERT(HDR_HAS_L1HDR(hdr));

	mutex_enter(&hdr->b_l1hdr.b_freeze_lock);

	if (hdr->b_l1hdr.b_freeze_cksum == NULL \|\| HDR_IO_ERROR(hdr)) {
	mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
	return;
	}

	fletcher_2_native(buf->b_data, arc_buf_size(buf), NULL, &zc);
	if (!ZIO_CHECKSUM_EQUAL(*hdr->b_l1hdr.b_freeze_cksum, zc))
	panic("buffer modified while frozen!");
	mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
	}

	/*
	* This function makes the assumption that data stored in the L2ARC
	* will be transformed exactly as it is in the main pool. Because of
	* this we can verify the checksum against the reading process's bp.
	*/
	static boolean_t
	arc_cksum_is_equal(arc_buf_hdr_t hdr, zio_t zio)
	{
	ASSERT(!BP_IS_EMBEDDED(zio->io_bp));
	VERIFY3U(BP_GET_PSIZE(zio->io_bp), ==, HDR_GET_PSIZE(hdr));

	/*
	* Block pointers always store the checksum for the logical data.
	* If the block pointer has the gang bit set, then the checksum
	* it represents is for the reconstituted data and not for an
	* individual gang member. The zio pipeline, however, must be able to
	* determine the checksum of each of the gang constituents so it
	* treats the checksum comparison differently than what we need
	* for l2arc blocks. This prevents us from using the
	* zio_checksum_error() interface directly. Instead we must call the
	* zio_checksum_error_impl() so that we can ensure the checksum is
	* generated using the correct checksum algorithm and accounts for the
	* logical I/O size and not just a gang fragment.
	*/
	return (zio_checksum_error_impl(zio->io_spa, zio->io_bp,
	BP_GET_CHECKSUM(zio->io_bp), zio->io_abd, zio->io_size,
	zio->io_offset, NULL) == 0);
	}

	/*
	* Given a buf full of data, if ZFS_DEBUG_MODIFY is enabled this computes a
	* checksum and attaches it to the buf's hdr so that we can ensure that the buf
	* isn't modified later on. If buf is compressed or there is already a checksum
	* on the hdr, this is a no-op (we only checksum uncompressed bufs).
	*/
	static void
	arc_cksum_compute(arc_buf_t *buf)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	if (!(zfs_flags & ZFS_DEBUG_MODIFY))
	return;

	ASSERT(HDR_HAS_L1HDR(hdr));

	mutex_enter(&buf->b_hdr->b_l1hdr.b_freeze_lock);
	if (hdr->b_l1hdr.b_freeze_cksum != NULL \|\| ARC_BUF_COMPRESSED(buf)) {
	mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
	return;
	}

	ASSERT(!ARC_BUF_ENCRYPTED(buf));
	ASSERT(!ARC_BUF_COMPRESSED(buf));
	hdr->b_l1hdr.b_freeze_cksum = kmem_alloc(sizeof (zio_cksum_t),
	KM_SLEEP);
	fletcher_2_native(buf->b_data, arc_buf_size(buf), NULL,
	hdr->b_l1hdr.b_freeze_cksum);
	mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
	arc_buf_watch(buf);
	}

	#ifndef _KERNEL
	void
	arc_buf_sigsegv(int sig, siginfo_t si, void unused)
	{
	panic("Got SIGSEGV at address: 0x%lx\n", (long)si->si_addr);
	}
	#endif

	/* ARGSUSED */
	static void
	arc_buf_unwatch(arc_buf_t *buf)
	{
	#ifndef _KERNEL
	if (arc_watch) {
	ASSERT0(mprotect(buf->b_data, arc_buf_size(buf),
	PROT_READ \| PROT_WRITE));
	}
	#endif
	}

	/* ARGSUSED */
	static void
	arc_buf_watch(arc_buf_t *buf)
	{
	#ifndef _KERNEL
	if (arc_watch)
	ASSERT0(mprotect(buf->b_data, arc_buf_size(buf),
	PROT_READ));
	#endif
	}

	static arc_buf_contents_t
	arc_buf_type(arc_buf_hdr_t *hdr)
	{
	arc_buf_contents_t type;
	if (HDR_ISTYPE_METADATA(hdr)) {
	type = ARC_BUFC_METADATA;
	} else {
	type = ARC_BUFC_DATA;
	}
	VERIFY3U(hdr->b_type, ==, type);
	return (type);
	}

	boolean_t
	arc_is_metadata(arc_buf_t *buf)
	{
	return (HDR_ISTYPE_METADATA(buf->b_hdr) != 0);
	}

	static uint32_t
	arc_bufc_to_flags(arc_buf_contents_t type)
	{
	switch (type) {
	case ARC_BUFC_DATA:
	/* metadata field is 0 if buffer contains normal data */
	return (0);
	case ARC_BUFC_METADATA:
	return (ARC_FLAG_BUFC_METADATA);
	default:
	break;
	}
	panic("undefined ARC buffer type!");
	return ((uint32_t)-1);
	}

	void
	arc_buf_thaw(arc_buf_t *buf)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
	ASSERT(!HDR_IO_IN_PROGRESS(hdr));

	arc_cksum_verify(buf);

	/*
	* Compressed buffers do not manipulate the b_freeze_cksum.
	*/
	if (ARC_BUF_COMPRESSED(buf))
	return;

	ASSERT(HDR_HAS_L1HDR(hdr));
	arc_cksum_free(hdr);
	arc_buf_unwatch(buf);
	}

	void
	arc_buf_freeze(arc_buf_t *buf)
	{
	if (!(zfs_flags & ZFS_DEBUG_MODIFY))
	return;

	if (ARC_BUF_COMPRESSED(buf))
	return;

	ASSERT(HDR_HAS_L1HDR(buf->b_hdr));
	arc_cksum_compute(buf);
	}

	/*
	* The arc_buf_hdr_t's b_flags should never be modified directly. Instead,
	* the following functions should be used to ensure that the flags are
	* updated in a thread-safe way. When manipulating the flags either
	* the hash_lock must be held or the hdr must be undiscoverable. This
	* ensures that we're not racing with any other threads when updating
	* the flags.
	*/
	static inline void
	arc_hdr_set_flags(arc_buf_hdr_t *hdr, arc_flags_t flags)
	{
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));
	hdr->b_flags \|= flags;
	}

	static inline void
	arc_hdr_clear_flags(arc_buf_hdr_t *hdr, arc_flags_t flags)
	{
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));
	hdr->b_flags &= ~flags;
	}

	/*
	* Setting the compression bits in the arc_buf_hdr_t's b_flags is
	* done in a special way since we have to clear and set bits
	* at the same time. Consumers that wish to set the compression bits
	* must use this function to ensure that the flags are updated in
	* thread-safe manner.
	*/
	static void
	arc_hdr_set_compress(arc_buf_hdr_t *hdr, enum zio_compress cmp)
	{
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));

	/*
	* Holes and embedded blocks will always have a psize = 0 so
	* we ignore the compression of the blkptr and set the
	* want to uncompress them. Mark them as uncompressed.
	*/
	if (!zfs_compressed_arc_enabled \|\| HDR_GET_PSIZE(hdr) == 0) {
	arc_hdr_clear_flags(hdr, ARC_FLAG_COMPRESSED_ARC);
	ASSERT(!HDR_COMPRESSION_ENABLED(hdr));
	} else {
	arc_hdr_set_flags(hdr, ARC_FLAG_COMPRESSED_ARC);
	ASSERT(HDR_COMPRESSION_ENABLED(hdr));
	}

	HDR_SET_COMPRESS(hdr, cmp);
	ASSERT3U(HDR_GET_COMPRESS(hdr), ==, cmp);
	}

	/*
	* Looks for another buf on the same hdr which has the data decompressed, copies
	* from it, and returns true. If no such buf exists, returns false.
	*/
	static boolean_t
	arc_buf_try_copy_decompressed_data(arc_buf_t *buf)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;
	boolean_t copied = B_FALSE;

	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT3P(buf->b_data, !=, NULL);
	ASSERT(!ARC_BUF_COMPRESSED(buf));

	for (arc_buf_t *from = hdr->b_l1hdr.b_buf; from != NULL;
	from = from->b_next) {
	/* can't use our own data buffer */
	if (from == buf) {
	continue;
	}

	if (!ARC_BUF_COMPRESSED(from)) {
	bcopy(from->b_data, buf->b_data, arc_buf_size(buf));
	copied = B_TRUE;
	break;
	}
	}

	/*
	* There were no decompressed bufs, so there should not be a
	* checksum on the hdr either.
	*/
	if (zfs_flags & ZFS_DEBUG_MODIFY)
	EQUIV(!copied, hdr->b_l1hdr.b_freeze_cksum == NULL);

	return (copied);
	}

	/*
	* Allocates an ARC buf header that's in an evicted & L2-cached state.
	* This is used during l2arc reconstruction to make empty ARC buffers
	* which circumvent the regular disk->arc->l2arc path and instead come
	* into being in the reverse order, i.e. l2arc->arc.
	*/
	static arc_buf_hdr_t *
	arc_buf_alloc_l2only(size_t size, arc_buf_contents_t type, l2arc_dev_t *dev,
	dva_t dva, uint64_t daddr, int32_t psize, uint64_t birth,
	enum zio_compress compress, uint8_t complevel, boolean_t protected,
	boolean_t prefetch, arc_state_type_t arcs_state)
	{
	arc_buf_hdr_t *hdr;

	ASSERT(size != 0);
	hdr = kmem_cache_alloc(hdr_l2only_cache, KM_SLEEP);
	hdr->b_birth = birth;
	hdr->b_type = type;
	hdr->b_flags = 0;
	arc_hdr_set_flags(hdr, arc_bufc_to_flags(type) \| ARC_FLAG_HAS_L2HDR);
	HDR_SET_LSIZE(hdr, size);
	HDR_SET_PSIZE(hdr, psize);
	arc_hdr_set_compress(hdr, compress);
	hdr->b_complevel = complevel;
	if (protected)
	arc_hdr_set_flags(hdr, ARC_FLAG_PROTECTED);
	if (prefetch)
	arc_hdr_set_flags(hdr, ARC_FLAG_PREFETCH);
	hdr->b_spa = spa_load_guid(dev->l2ad_vdev->vdev_spa);

	hdr->b_dva = dva;

	hdr->b_l2hdr.b_dev = dev;
	hdr->b_l2hdr.b_daddr = daddr;
	hdr->b_l2hdr.b_arcs_state = arcs_state;

	return (hdr);
	}

	/*
	* Return the size of the block, b_pabd, that is stored in the arc_buf_hdr_t.
	*/
	static uint64_t
	arc_hdr_size(arc_buf_hdr_t *hdr)
	{
	uint64_t size;

	if (arc_hdr_get_compress(hdr) != ZIO_COMPRESS_OFF &&
	HDR_GET_PSIZE(hdr) > 0) {
	size = HDR_GET_PSIZE(hdr);
	} else {
	ASSERT3U(HDR_GET_LSIZE(hdr), !=, 0);
	size = HDR_GET_LSIZE(hdr);
	}
	return (size);
	}

	static int
	arc_hdr_authenticate(arc_buf_hdr_t hdr, spa_t spa, uint64_t dsobj)
	{
	int ret;
	uint64_t csize;
	uint64_t lsize = HDR_GET_LSIZE(hdr);
	uint64_t psize = HDR_GET_PSIZE(hdr);
	void *tmpbuf = NULL;
	abd_t *abd = hdr->b_l1hdr.b_pabd;

	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));
	ASSERT(HDR_AUTHENTICATED(hdr));
	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);

	/*
	* The MAC is calculated on the compressed data that is stored on disk.
	* However, if compressed arc is disabled we will only have the
	* decompressed data available to us now. Compress it into a temporary
	* abd so we can verify the MAC. The performance overhead of this will
	* be relatively low, since most objects in an encrypted objset will
	* be encrypted (instead of authenticated) anyway.
	*/
	if (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF &&
	!HDR_COMPRESSION_ENABLED(hdr)) {
	tmpbuf = zio_buf_alloc(lsize);
	abd = abd_get_from_buf(tmpbuf, lsize);
	abd_take_ownership_of_buf(abd, B_TRUE);
	csize = zio_compress_data(HDR_GET_COMPRESS(hdr),
	hdr->b_l1hdr.b_pabd, tmpbuf, lsize, hdr->b_complevel);
	ASSERT3U(csize, <=, psize);
	abd_zero_off(abd, csize, psize - csize);
	}

	/*
	* Authentication is best effort. We authenticate whenever the key is
	* available. If we succeed we clear ARC_FLAG_NOAUTH.
	*/
	if (hdr->b_crypt_hdr.b_ot == DMU_OT_OBJSET) {
	ASSERT3U(HDR_GET_COMPRESS(hdr), ==, ZIO_COMPRESS_OFF);
	ASSERT3U(lsize, ==, psize);
	ret = spa_do_crypt_objset_mac_abd(B_FALSE, spa, dsobj, abd,
	psize, hdr->b_l1hdr.b_byteswap != DMU_BSWAP_NUMFUNCS);
	} else {
	ret = spa_do_crypt_mac_abd(B_FALSE, spa, dsobj, abd, psize,
	hdr->b_crypt_hdr.b_mac);
	}

	if (ret == 0)
	arc_hdr_clear_flags(hdr, ARC_FLAG_NOAUTH);
	else if (ret != ENOENT)
	goto error;

	if (tmpbuf != NULL)
	abd_free(abd);

	return (0);

	error:
	if (tmpbuf != NULL)
	abd_free(abd);

	return (ret);
	}

	/*
	* This function will take a header that only has raw encrypted data in
	* b_crypt_hdr.b_rabd and decrypt it into a new buffer which is stored in
	* b_l1hdr.b_pabd. If designated in the header flags, this function will
	* also decompress the data.
	*/
	static int
	arc_hdr_decrypt(arc_buf_hdr_t hdr, spa_t spa, const zbookmark_phys_t *zb)
	{
	int ret;
	abd_t *cabd = NULL;
	void *tmp = NULL;
	boolean_t no_crypt = B_FALSE;
	boolean_t bswap = (hdr->b_l1hdr.b_byteswap != DMU_BSWAP_NUMFUNCS);

	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));
	ASSERT(HDR_ENCRYPTED(hdr));

	arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT);

	ret = spa_do_crypt_abd(B_FALSE, spa, zb, hdr->b_crypt_hdr.b_ot,
	B_FALSE, bswap, hdr->b_crypt_hdr.b_salt, hdr->b_crypt_hdr.b_iv,
	hdr->b_crypt_hdr.b_mac, HDR_GET_PSIZE(hdr), hdr->b_l1hdr.b_pabd,
	hdr->b_crypt_hdr.b_rabd, &no_crypt);
	if (ret != 0)
	goto error;

	if (no_crypt) {
	abd_copy(hdr->b_l1hdr.b_pabd, hdr->b_crypt_hdr.b_rabd,
	HDR_GET_PSIZE(hdr));
	}

	/*
	* If this header has disabled arc compression but the b_pabd is
	* compressed after decrypting it, we need to decompress the newly
	* decrypted data.
	*/
	if (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF &&
	!HDR_COMPRESSION_ENABLED(hdr)) {
	/*
	* We want to make sure that we are correctly honoring the
	* zfs_abd_scatter_enabled setting, so we allocate an abd here
	* and then loan a buffer from it, rather than allocating a
	* linear buffer and wrapping it in an abd later.
	*/
	- cabd = arc_get_data_abd(hdr, arc_hdr_size(hdr), hdr, B_TRUE);
	+ cabd = arc_get_data_abd(hdr, arc_hdr_size(hdr), hdr,
	+ ARC_HDR_DO_ADAPT);
	tmp = abd_borrow_buf(cabd, arc_hdr_size(hdr));

	ret = zio_decompress_data(HDR_GET_COMPRESS(hdr),
	hdr->b_l1hdr.b_pabd, tmp, HDR_GET_PSIZE(hdr),
	HDR_GET_LSIZE(hdr), &hdr->b_complevel);
	if (ret != 0) {
	abd_return_buf(cabd, tmp, arc_hdr_size(hdr));
	goto error;
	}

	abd_return_buf_copy(cabd, tmp, arc_hdr_size(hdr));
	arc_free_data_abd(hdr, hdr->b_l1hdr.b_pabd,
	arc_hdr_size(hdr), hdr);
	hdr->b_l1hdr.b_pabd = cabd;
	}

	return (0);

	error:
	arc_hdr_free_abd(hdr, B_FALSE);
	if (cabd != NULL)
	arc_free_data_buf(hdr, cabd, arc_hdr_size(hdr), hdr);

	return (ret);
	}

	/*
	* This function is called during arc_buf_fill() to prepare the header's
	* abd plaintext pointer for use. This involves authenticated protected
	* data and decrypting encrypted data into the plaintext abd.
	*/
	static int
	arc_fill_hdr_crypt(arc_buf_hdr_t hdr, kmutex_t hash_lock, spa_t *spa,
	const zbookmark_phys_t *zb, boolean_t noauth)
	{
	int ret;

	ASSERT(HDR_PROTECTED(hdr));

	if (hash_lock != NULL)
	mutex_enter(hash_lock);

	if (HDR_NOAUTH(hdr) && !noauth) {
	/*
	* The caller requested authenticated data but our data has
	* not been authenticated yet. Verify the MAC now if we can.
	*/
	ret = arc_hdr_authenticate(hdr, spa, zb->zb_objset);
	if (ret != 0)
	goto error;
	} else if (HDR_HAS_RABD(hdr) && hdr->b_l1hdr.b_pabd == NULL) {
	/*
	* If we only have the encrypted version of the data, but the
	* unencrypted version was requested we take this opportunity
	* to store the decrypted version in the header for future use.
	*/
	ret = arc_hdr_decrypt(hdr, spa, zb);
	if (ret != 0)
	goto error;
	}

	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);

	if (hash_lock != NULL)
	mutex_exit(hash_lock);

	return (0);

	error:
	if (hash_lock != NULL)
	mutex_exit(hash_lock);

	return (ret);
	}

	/*
	* This function is used by the dbuf code to decrypt bonus buffers in place.
	* The dbuf code itself doesn't have any locking for decrypting a shared dnode
	* block, so we use the hash lock here to protect against concurrent calls to
	* arc_buf_fill().
	*/
	static void
	arc_buf_untransform_in_place(arc_buf_t buf, kmutex_t hash_lock)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	ASSERT(HDR_ENCRYPTED(hdr));
	ASSERT3U(hdr->b_crypt_hdr.b_ot, ==, DMU_OT_DNODE);
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));
	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);

	zio_crypt_copy_dnode_bonus(hdr->b_l1hdr.b_pabd, buf->b_data,
	arc_buf_size(buf));
	buf->b_flags &= ~ARC_BUF_FLAG_ENCRYPTED;
	buf->b_flags &= ~ARC_BUF_FLAG_COMPRESSED;
	hdr->b_crypt_hdr.b_ebufcnt -= 1;
	}

	/*
	* Given a buf that has a data buffer attached to it, this function will
	* efficiently fill the buf with data of the specified compression setting from
	* the hdr and update the hdr's b_freeze_cksum if necessary. If the buf and hdr
	* are already sharing a data buf, no copy is performed.
	*
	* If the buf is marked as compressed but uncompressed data was requested, this
	* will allocate a new data buffer for the buf, remove that flag, and fill the
	* buf with uncompressed data. You can't request a compressed buf on a hdr with
	* uncompressed data, and (since we haven't added support for it yet) if you
	* want compressed data your buf must already be marked as compressed and have
	* the correct-sized data buffer.
	*/
	static int
	arc_buf_fill(arc_buf_t buf, spa_t spa, const zbookmark_phys_t *zb,
	arc_fill_flags_t flags)
	{
	int error = 0;
	arc_buf_hdr_t *hdr = buf->b_hdr;
	boolean_t hdr_compressed =
	(arc_hdr_get_compress(hdr) != ZIO_COMPRESS_OFF);
	boolean_t compressed = (flags & ARC_FILL_COMPRESSED) != 0;
	boolean_t encrypted = (flags & ARC_FILL_ENCRYPTED) != 0;
	dmu_object_byteswap_t bswap = hdr->b_l1hdr.b_byteswap;
	kmutex_t *hash_lock = (flags & ARC_FILL_LOCKED) ? NULL : HDR_LOCK(hdr);

	ASSERT3P(buf->b_data, !=, NULL);
	IMPLY(compressed, hdr_compressed \|\| ARC_BUF_ENCRYPTED(buf));
	IMPLY(compressed, ARC_BUF_COMPRESSED(buf));
	IMPLY(encrypted, HDR_ENCRYPTED(hdr));
	IMPLY(encrypted, ARC_BUF_ENCRYPTED(buf));
	IMPLY(encrypted, ARC_BUF_COMPRESSED(buf));
	IMPLY(encrypted, !ARC_BUF_SHARED(buf));

	/*
	* If the caller wanted encrypted data we just need to copy it from
	* b_rabd and potentially byteswap it. We won't be able to do any
	* further transforms on it.
	*/
	if (encrypted) {
	ASSERT(HDR_HAS_RABD(hdr));
	abd_copy_to_buf(buf->b_data, hdr->b_crypt_hdr.b_rabd,
	HDR_GET_PSIZE(hdr));
	goto byteswap;
	}

	/*
	* Adjust encrypted and authenticated headers to accommodate
	* the request if needed. Dnode blocks (ARC_FILL_IN_PLACE) are
	* allowed to fail decryption due to keys not being loaded
	* without being marked as an IO error.
	*/
	if (HDR_PROTECTED(hdr)) {
	error = arc_fill_hdr_crypt(hdr, hash_lock, spa,
	zb, !!(flags & ARC_FILL_NOAUTH));
	if (error == EACCES && (flags & ARC_FILL_IN_PLACE) != 0) {
	return (error);
	} else if (error != 0) {
	if (hash_lock != NULL)
	mutex_enter(hash_lock);
	arc_hdr_set_flags(hdr, ARC_FLAG_IO_ERROR);
	if (hash_lock != NULL)
	mutex_exit(hash_lock);
	return (error);
	}
	}

	/*
	* There is a special case here for dnode blocks which are
	* decrypting their bonus buffers. These blocks may request to
	* be decrypted in-place. This is necessary because there may
	* be many dnodes pointing into this buffer and there is
	* currently no method to synchronize replacing the backing
	* b_data buffer and updating all of the pointers. Here we use
	* the hash lock to ensure there are no races. If the need
	* arises for other types to be decrypted in-place, they must
	* add handling here as well.
	*/
	if ((flags & ARC_FILL_IN_PLACE) != 0) {
	ASSERT(!hdr_compressed);
	ASSERT(!compressed);
	ASSERT(!encrypted);

	if (HDR_ENCRYPTED(hdr) && ARC_BUF_ENCRYPTED(buf)) {
	ASSERT3U(hdr->b_crypt_hdr.b_ot, ==, DMU_OT_DNODE);

	if (hash_lock != NULL)
	mutex_enter(hash_lock);
	arc_buf_untransform_in_place(buf, hash_lock);
	if (hash_lock != NULL)
	mutex_exit(hash_lock);

	/* Compute the hdr's checksum if necessary */
	arc_cksum_compute(buf);
	}

	return (0);
	}

	if (hdr_compressed == compressed) {
	if (!arc_buf_is_shared(buf)) {
	abd_copy_to_buf(buf->b_data, hdr->b_l1hdr.b_pabd,
	arc_buf_size(buf));
	}
	} else {
	ASSERT(hdr_compressed);
	ASSERT(!compressed);
	ASSERT3U(HDR_GET_LSIZE(hdr), !=, HDR_GET_PSIZE(hdr));

	/*
	* If the buf is sharing its data with the hdr, unlink it and
	* allocate a new data buffer for the buf.
	*/
	if (arc_buf_is_shared(buf)) {
	ASSERT(ARC_BUF_COMPRESSED(buf));

	/* We need to give the buf its own b_data */
	buf->b_flags &= ~ARC_BUF_FLAG_SHARED;
	buf->b_data =
	arc_get_data_buf(hdr, HDR_GET_LSIZE(hdr), buf);
	arc_hdr_clear_flags(hdr, ARC_FLAG_SHARED_DATA);

	/* Previously overhead was 0; just add new overhead */
	ARCSTAT_INCR(arcstat_overhead_size, HDR_GET_LSIZE(hdr));
	} else if (ARC_BUF_COMPRESSED(buf)) {
	/* We need to reallocate the buf's b_data */
	arc_free_data_buf(hdr, buf->b_data, HDR_GET_PSIZE(hdr),
	buf);
	buf->b_data =
	arc_get_data_buf(hdr, HDR_GET_LSIZE(hdr), buf);

	/* We increased the size of b_data; update overhead */
	ARCSTAT_INCR(arcstat_overhead_size,
	HDR_GET_LSIZE(hdr) - HDR_GET_PSIZE(hdr));
	}

	/*
	* Regardless of the buf's previous compression settings, it
	* should not be compressed at the end of this function.
	*/
	buf->b_flags &= ~ARC_BUF_FLAG_COMPRESSED;

	/*
	* Try copying the data from another buf which already has a
	* decompressed version. If that's not possible, it's time to
	* bite the bullet and decompress the data from the hdr.
	*/
	if (arc_buf_try_copy_decompressed_data(buf)) {
	/* Skip byteswapping and checksumming (already done) */
	return (0);
	} else {
	error = zio_decompress_data(HDR_GET_COMPRESS(hdr),
	hdr->b_l1hdr.b_pabd, buf->b_data,
	HDR_GET_PSIZE(hdr), HDR_GET_LSIZE(hdr),
	&hdr->b_complevel);

	/*
	* Absent hardware errors or software bugs, this should
	* be impossible, but log it anyway so we can debug it.
	*/
	if (error != 0) {
	zfs_dbgmsg(
	"hdr %px, compress %d, psize %d, lsize %d",
	hdr, arc_hdr_get_compress(hdr),
	HDR_GET_PSIZE(hdr), HDR_GET_LSIZE(hdr));
	if (hash_lock != NULL)
	mutex_enter(hash_lock);
	arc_hdr_set_flags(hdr, ARC_FLAG_IO_ERROR);
	if (hash_lock != NULL)
	mutex_exit(hash_lock);
	return (SET_ERROR(EIO));
	}
	}
	}

	byteswap:
	/* Byteswap the buf's data if necessary */
	if (bswap != DMU_BSWAP_NUMFUNCS) {
	ASSERT(!HDR_SHARED_DATA(hdr));
	ASSERT3U(bswap, <, DMU_BSWAP_NUMFUNCS);
	dmu_ot_byteswap[bswap].ob_func(buf->b_data, HDR_GET_LSIZE(hdr));
	}

	/* Compute the hdr's checksum if necessary */
	arc_cksum_compute(buf);

	return (0);
	}

	/*
	* If this function is being called to decrypt an encrypted buffer or verify an
	* authenticated one, the key must be loaded and a mapping must be made
	* available in the keystore via spa_keystore_create_mapping() or one of its
	* callers.
	*/
	int
	arc_untransform(arc_buf_t buf, spa_t spa, const zbookmark_phys_t *zb,
	boolean_t in_place)
	{
	int ret;
	arc_fill_flags_t flags = 0;

	if (in_place)
	flags \|= ARC_FILL_IN_PLACE;

	ret = arc_buf_fill(buf, spa, zb, flags);
	if (ret == ECKSUM) {
	/*
	* Convert authentication and decryption errors to EIO
	* (and generate an ereport) before leaving the ARC.
	*/
	ret = SET_ERROR(EIO);
	spa_log_error(spa, zb);
	(void) zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION,
	spa, NULL, zb, NULL, 0);
	}

	return (ret);
	}

	/*
	* Increment the amount of evictable space in the arc_state_t's refcount.
	* We account for the space used by the hdr and the arc buf individually
	* so that we can add and remove them from the refcount individually.
	*/
	static void
	arc_evictable_space_increment(arc_buf_hdr_t hdr, arc_state_t state)
	{
	arc_buf_contents_t type = arc_buf_type(hdr);

	ASSERT(HDR_HAS_L1HDR(hdr));

	if (GHOST_STATE(state)) {
	ASSERT0(hdr->b_l1hdr.b_bufcnt);
	ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!HDR_HAS_RABD(hdr));
	(void) zfs_refcount_add_many(&state->arcs_esize[type],
	HDR_GET_LSIZE(hdr), hdr);
	return;
	}

	- ASSERT(!GHOST_STATE(state));
	if (hdr->b_l1hdr.b_pabd != NULL) {
	(void) zfs_refcount_add_many(&state->arcs_esize[type],
	arc_hdr_size(hdr), hdr);
	}
	if (HDR_HAS_RABD(hdr)) {
	(void) zfs_refcount_add_many(&state->arcs_esize[type],
	HDR_GET_PSIZE(hdr), hdr);
	}

	for (arc_buf_t *buf = hdr->b_l1hdr.b_buf; buf != NULL;
	buf = buf->b_next) {
	if (arc_buf_is_shared(buf))
	continue;
	(void) zfs_refcount_add_many(&state->arcs_esize[type],
	arc_buf_size(buf), buf);
	}
	}

	/*
	* Decrement the amount of evictable space in the arc_state_t's refcount.
	* We account for the space used by the hdr and the arc buf individually
	* so that we can add and remove them from the refcount individually.
	*/
	static void
	arc_evictable_space_decrement(arc_buf_hdr_t hdr, arc_state_t state)
	{
	arc_buf_contents_t type = arc_buf_type(hdr);

	ASSERT(HDR_HAS_L1HDR(hdr));

	if (GHOST_STATE(state)) {
	ASSERT0(hdr->b_l1hdr.b_bufcnt);
	ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!HDR_HAS_RABD(hdr));
	(void) zfs_refcount_remove_many(&state->arcs_esize[type],
	HDR_GET_LSIZE(hdr), hdr);
	return;
	}

	- ASSERT(!GHOST_STATE(state));
	if (hdr->b_l1hdr.b_pabd != NULL) {
	(void) zfs_refcount_remove_many(&state->arcs_esize[type],
	arc_hdr_size(hdr), hdr);
	}
	if (HDR_HAS_RABD(hdr)) {
	(void) zfs_refcount_remove_many(&state->arcs_esize[type],
	HDR_GET_PSIZE(hdr), hdr);
	}

	for (arc_buf_t *buf = hdr->b_l1hdr.b_buf; buf != NULL;
	buf = buf->b_next) {
	if (arc_buf_is_shared(buf))
	continue;
	(void) zfs_refcount_remove_many(&state->arcs_esize[type],
	arc_buf_size(buf), buf);
	}
	}

	/*
	* Add a reference to this hdr indicating that someone is actively
	* referencing that memory. When the refcount transitions from 0 to 1,
	* we remove it from the respective arc_state_t list to indicate that
	* it is not evictable.
	*/
	static void
	add_reference(arc_buf_hdr_t hdr, void tag)
	{
	arc_state_t *state;

	ASSERT(HDR_HAS_L1HDR(hdr));
	if (!HDR_EMPTY(hdr) && !MUTEX_HELD(HDR_LOCK(hdr))) {
	ASSERT(hdr->b_l1hdr.b_state == arc_anon);
	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
	ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
	}

	state = hdr->b_l1hdr.b_state;

	if ((zfs_refcount_add(&hdr->b_l1hdr.b_refcnt, tag) == 1) &&
	(state != arc_anon)) {
	/* We don't use the L2-only state list. */
	if (state != arc_l2c_only) {
	multilist_remove(&state->arcs_list[arc_buf_type(hdr)],
	hdr);
	arc_evictable_space_decrement(hdr, state);
	}
	/* remove the prefetch flag if we get a reference */
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_decrement_state(hdr);
	arc_hdr_clear_flags(hdr, ARC_FLAG_PREFETCH);
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_increment_state(hdr);
	}
	}

	/*
	* Remove a reference from this hdr. When the reference transitions from
	* 1 to 0 and we're not anonymous, then we add this hdr to the arc_state_t's
	* list making it eligible for eviction.
	*/
	static int
	remove_reference(arc_buf_hdr_t hdr, kmutex_t hash_lock, void *tag)
	{
	int cnt;
	arc_state_t *state = hdr->b_l1hdr.b_state;

	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT(state == arc_anon \|\| MUTEX_HELD(hash_lock));
	ASSERT(!GHOST_STATE(state));

	/*
	* arc_l2c_only counts as a ghost state so we don't need to explicitly
	* check to prevent usage of the arc_l2c_only list.
	*/
	if (((cnt = zfs_refcount_remove(&hdr->b_l1hdr.b_refcnt, tag)) == 0) &&
	(state != arc_anon)) {
	multilist_insert(&state->arcs_list[arc_buf_type(hdr)], hdr);
	ASSERT3U(hdr->b_l1hdr.b_bufcnt, >, 0);
	arc_evictable_space_increment(hdr, state);
	}
	return (cnt);
	}

	/*
	* Returns detailed information about a specific arc buffer. When the
	* state_index argument is set the function will calculate the arc header
	* list position for its arc state. Since this requires a linear traversal
	* callers are strongly encourage not to do this. However, it can be helpful
	* for targeted analysis so the functionality is provided.
	*/
	void
	arc_buf_info(arc_buf_t ab, arc_buf_info_t abi, int state_index)
	{
	arc_buf_hdr_t *hdr = ab->b_hdr;
	l1arc_buf_hdr_t *l1hdr = NULL;
	l2arc_buf_hdr_t *l2hdr = NULL;
	arc_state_t *state = NULL;

	memset(abi, 0, sizeof (arc_buf_info_t));

	if (hdr == NULL)
	return;

	abi->abi_flags = hdr->b_flags;

	if (HDR_HAS_L1HDR(hdr)) {
	l1hdr = &hdr->b_l1hdr;
	state = l1hdr->b_state;
	}
	if (HDR_HAS_L2HDR(hdr))
	l2hdr = &hdr->b_l2hdr;

	if (l1hdr) {
	abi->abi_bufcnt = l1hdr->b_bufcnt;
	abi->abi_access = l1hdr->b_arc_access;
	abi->abi_mru_hits = l1hdr->b_mru_hits;
	abi->abi_mru_ghost_hits = l1hdr->b_mru_ghost_hits;
	abi->abi_mfu_hits = l1hdr->b_mfu_hits;
	abi->abi_mfu_ghost_hits = l1hdr->b_mfu_ghost_hits;
	abi->abi_holds = zfs_refcount_count(&l1hdr->b_refcnt);
	}

	if (l2hdr) {
	abi->abi_l2arc_dattr = l2hdr->b_daddr;
	abi->abi_l2arc_hits = l2hdr->b_hits;
	}

	abi->abi_state_type = state ? state->arcs_state : ARC_STATE_ANON;
	abi->abi_state_contents = arc_buf_type(hdr);
	abi->abi_size = arc_hdr_size(hdr);
	}

	/*
	* Move the supplied buffer to the indicated state. The hash lock
	* for the buffer must be held by the caller.
	*/
	static void
	arc_change_state(arc_state_t new_state, arc_buf_hdr_t hdr,
	kmutex_t *hash_lock)
	{
	arc_state_t *old_state;
	int64_t refcnt;
	uint32_t bufcnt;
	boolean_t update_old, update_new;
	arc_buf_contents_t buftype = arc_buf_type(hdr);

	/*
	* We almost always have an L1 hdr here, since we call arc_hdr_realloc()
	* in arc_read() when bringing a buffer out of the L2ARC. However, the
	* L1 hdr doesn't always exist when we change state to arc_anon before
	* destroying a header, in which case reallocating to add the L1 hdr is
	* pointless.
	*/
	if (HDR_HAS_L1HDR(hdr)) {
	old_state = hdr->b_l1hdr.b_state;
	refcnt = zfs_refcount_count(&hdr->b_l1hdr.b_refcnt);
	bufcnt = hdr->b_l1hdr.b_bufcnt;
	update_old = (bufcnt > 0 \|\| hdr->b_l1hdr.b_pabd != NULL \|\|
	HDR_HAS_RABD(hdr));
	} else {
	old_state = arc_l2c_only;
	refcnt = 0;
	bufcnt = 0;
	update_old = B_FALSE;
	}
	update_new = update_old;

	ASSERT(MUTEX_HELD(hash_lock));
	ASSERT3P(new_state, !=, old_state);
	ASSERT(!GHOST_STATE(new_state) \|\| bufcnt == 0);
	ASSERT(old_state != arc_anon \|\| bufcnt <= 1);

	/*
	* If this buffer is evictable, transfer it from the
	* old state list to the new state list.
	*/
	if (refcnt == 0) {
	if (old_state != arc_anon && old_state != arc_l2c_only) {
	ASSERT(HDR_HAS_L1HDR(hdr));
	multilist_remove(&old_state->arcs_list[buftype], hdr);

	if (GHOST_STATE(old_state)) {
	ASSERT0(bufcnt);
	ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
	update_old = B_TRUE;
	}
	arc_evictable_space_decrement(hdr, old_state);
	}
	if (new_state != arc_anon && new_state != arc_l2c_only) {
	/*
	* An L1 header always exists here, since if we're
	* moving to some L1-cached state (i.e. not l2c_only or
	* anonymous), we realloc the header to add an L1hdr
	* beforehand.
	*/
	ASSERT(HDR_HAS_L1HDR(hdr));
	multilist_insert(&new_state->arcs_list[buftype], hdr);

	if (GHOST_STATE(new_state)) {
	ASSERT0(bufcnt);
	ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
	update_new = B_TRUE;
	}
	arc_evictable_space_increment(hdr, new_state);
	}
	}

	ASSERT(!HDR_EMPTY(hdr));
	if (new_state == arc_anon && HDR_IN_HASH_TABLE(hdr))
	buf_hash_remove(hdr);

	/* adjust state sizes (ignore arc_l2c_only) */

	if (update_new && new_state != arc_l2c_only) {
	ASSERT(HDR_HAS_L1HDR(hdr));
	if (GHOST_STATE(new_state)) {
	ASSERT0(bufcnt);

	/*
	* When moving a header to a ghost state, we first
	* remove all arc buffers. Thus, we'll have a
	* bufcnt of zero, and no arc buffer to use for
	* the reference. As a result, we use the arc
	* header pointer for the reference.
	*/
	(void) zfs_refcount_add_many(&new_state->arcs_size,
	HDR_GET_LSIZE(hdr), hdr);
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!HDR_HAS_RABD(hdr));
	} else {
	uint32_t buffers = 0;

	/*
	* Each individual buffer holds a unique reference,
	* thus we must remove each of these references one
	* at a time.
	*/
	for (arc_buf_t *buf = hdr->b_l1hdr.b_buf; buf != NULL;
	buf = buf->b_next) {
	ASSERT3U(bufcnt, !=, 0);
	buffers++;

	/*
	* When the arc_buf_t is sharing the data
	* block with the hdr, the owner of the
	* reference belongs to the hdr. Only
	* add to the refcount if the arc_buf_t is
	* not shared.
	*/
	if (arc_buf_is_shared(buf))
	continue;

	(void) zfs_refcount_add_many(
	&new_state->arcs_size,
	arc_buf_size(buf), buf);
	}
	ASSERT3U(bufcnt, ==, buffers);

	if (hdr->b_l1hdr.b_pabd != NULL) {
	(void) zfs_refcount_add_many(
	&new_state->arcs_size,
	arc_hdr_size(hdr), hdr);
	}

	if (HDR_HAS_RABD(hdr)) {
	(void) zfs_refcount_add_many(
	&new_state->arcs_size,
	HDR_GET_PSIZE(hdr), hdr);
	}
	}
	}

	if (update_old && old_state != arc_l2c_only) {
	ASSERT(HDR_HAS_L1HDR(hdr));
	if (GHOST_STATE(old_state)) {
	ASSERT0(bufcnt);
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!HDR_HAS_RABD(hdr));

	/*
	* When moving a header off of a ghost state,
	* the header will not contain any arc buffers.
	* We use the arc header pointer for the reference
	* which is exactly what we did when we put the
	* header on the ghost state.
	*/

	(void) zfs_refcount_remove_many(&old_state->arcs_size,
	HDR_GET_LSIZE(hdr), hdr);
	} else {
	uint32_t buffers = 0;

	/*
	* Each individual buffer holds a unique reference,
	* thus we must remove each of these references one
	* at a time.
	*/
	for (arc_buf_t *buf = hdr->b_l1hdr.b_buf; buf != NULL;
	buf = buf->b_next) {
	ASSERT3U(bufcnt, !=, 0);
	buffers++;

	/*
	* When the arc_buf_t is sharing the data
	* block with the hdr, the owner of the
	* reference belongs to the hdr. Only
	* add to the refcount if the arc_buf_t is
	* not shared.
	*/
	if (arc_buf_is_shared(buf))
	continue;

	(void) zfs_refcount_remove_many(
	&old_state->arcs_size, arc_buf_size(buf),
	buf);
	}
	ASSERT3U(bufcnt, ==, buffers);
	ASSERT(hdr->b_l1hdr.b_pabd != NULL \|\|
	HDR_HAS_RABD(hdr));

	if (hdr->b_l1hdr.b_pabd != NULL) {
	(void) zfs_refcount_remove_many(
	&old_state->arcs_size, arc_hdr_size(hdr),
	hdr);
	}

	if (HDR_HAS_RABD(hdr)) {
	(void) zfs_refcount_remove_many(
	&old_state->arcs_size, HDR_GET_PSIZE(hdr),
	hdr);
	}
	}
	}

	if (HDR_HAS_L1HDR(hdr)) {
	hdr->b_l1hdr.b_state = new_state;

	if (HDR_HAS_L2HDR(hdr) && new_state != arc_l2c_only) {
	l2arc_hdr_arcstats_decrement_state(hdr);
	hdr->b_l2hdr.b_arcs_state = new_state->arcs_state;
	l2arc_hdr_arcstats_increment_state(hdr);
	}
	}
	-
	- /*
	- * L2 headers should never be on the L2 state list since they don't
	- * have L1 headers allocated.
	- */
	- ASSERT(multilist_is_empty(&arc_l2c_only->arcs_list[ARC_BUFC_DATA]) &&
	- multilist_is_empty(&arc_l2c_only->arcs_list[ARC_BUFC_METADATA]));
	}

	void
	arc_space_consume(uint64_t space, arc_space_type_t type)
	{
	ASSERT(type >= 0 && type < ARC_SPACE_NUMTYPES);

	switch (type) {
	default:
	break;
	case ARC_SPACE_DATA:
	ARCSTAT_INCR(arcstat_data_size, space);
	break;
	case ARC_SPACE_META:
	ARCSTAT_INCR(arcstat_metadata_size, space);
	break;
	case ARC_SPACE_BONUS:
	ARCSTAT_INCR(arcstat_bonus_size, space);
	break;
	case ARC_SPACE_DNODE:
	aggsum_add(&arc_sums.arcstat_dnode_size, space);
	break;
	case ARC_SPACE_DBUF:
	ARCSTAT_INCR(arcstat_dbuf_size, space);
	break;
	case ARC_SPACE_HDRS:
	ARCSTAT_INCR(arcstat_hdr_size, space);
	break;
	case ARC_SPACE_L2HDRS:
	aggsum_add(&arc_sums.arcstat_l2_hdr_size, space);
	break;
	case ARC_SPACE_ABD_CHUNK_WASTE:
	/*
	* Note: this includes space wasted by all scatter ABD's, not
	* just those allocated by the ARC. But the vast majority of
	* scatter ABD's come from the ARC, because other users are
	* very short-lived.
	*/
	ARCSTAT_INCR(arcstat_abd_chunk_waste_size, space);
	break;
	}

	if (type != ARC_SPACE_DATA && type != ARC_SPACE_ABD_CHUNK_WASTE)
	aggsum_add(&arc_sums.arcstat_meta_used, space);

	aggsum_add(&arc_sums.arcstat_size, space);
	}

	void
	arc_space_return(uint64_t space, arc_space_type_t type)
	{
	ASSERT(type >= 0 && type < ARC_SPACE_NUMTYPES);

	switch (type) {
	default:
	break;
	case ARC_SPACE_DATA:
	ARCSTAT_INCR(arcstat_data_size, -space);
	break;
	case ARC_SPACE_META:
	ARCSTAT_INCR(arcstat_metadata_size, -space);
	break;
	case ARC_SPACE_BONUS:
	ARCSTAT_INCR(arcstat_bonus_size, -space);
	break;
	case ARC_SPACE_DNODE:
	aggsum_add(&arc_sums.arcstat_dnode_size, -space);
	break;
	case ARC_SPACE_DBUF:
	ARCSTAT_INCR(arcstat_dbuf_size, -space);
	break;
	case ARC_SPACE_HDRS:
	ARCSTAT_INCR(arcstat_hdr_size, -space);
	break;
	case ARC_SPACE_L2HDRS:
	aggsum_add(&arc_sums.arcstat_l2_hdr_size, -space);
	break;
	case ARC_SPACE_ABD_CHUNK_WASTE:
	ARCSTAT_INCR(arcstat_abd_chunk_waste_size, -space);
	break;
	}

	if (type != ARC_SPACE_DATA && type != ARC_SPACE_ABD_CHUNK_WASTE) {
	ASSERT(aggsum_compare(&arc_sums.arcstat_meta_used,
	space) >= 0);
	ARCSTAT_MAX(arcstat_meta_max,
	aggsum_upper_bound(&arc_sums.arcstat_meta_used));
	aggsum_add(&arc_sums.arcstat_meta_used, -space);
	}

	ASSERT(aggsum_compare(&arc_sums.arcstat_size, space) >= 0);
	aggsum_add(&arc_sums.arcstat_size, -space);
	}

	/*
	* Given a hdr and a buf, returns whether that buf can share its b_data buffer
	* with the hdr's b_pabd.
	*/
	static boolean_t
	arc_can_share(arc_buf_hdr_t hdr, arc_buf_t buf)
	{
	/*
	* The criteria for sharing a hdr's data are:
	* 1. the buffer is not encrypted
	* 2. the hdr's compression matches the buf's compression
	* 3. the hdr doesn't need to be byteswapped
	* 4. the hdr isn't already being shared
	* 5. the buf is either compressed or it is the last buf in the hdr list
	*
	* Criterion #5 maintains the invariant that shared uncompressed
	* bufs must be the final buf in the hdr's b_buf list. Reading this, you
	* might ask, "if a compressed buf is allocated first, won't that be the
	* last thing in the list?", but in that case it's impossible to create
	* a shared uncompressed buf anyway (because the hdr must be compressed
	* to have the compressed buf). You might also think that #3 is
	* sufficient to make this guarantee, however it's possible
	* (specifically in the rare L2ARC write race mentioned in
	* arc_buf_alloc_impl()) there will be an existing uncompressed buf that
	* is shareable, but wasn't at the time of its allocation. Rather than
	* allow a new shared uncompressed buf to be created and then shuffle
	* the list around to make it the last element, this simply disallows
	* sharing if the new buf isn't the first to be added.
	*/
	ASSERT3P(buf->b_hdr, ==, hdr);
	boolean_t hdr_compressed =
	arc_hdr_get_compress(hdr) != ZIO_COMPRESS_OFF;
	boolean_t buf_compressed = ARC_BUF_COMPRESSED(buf) != 0;
	return (!ARC_BUF_ENCRYPTED(buf) &&
	buf_compressed == hdr_compressed &&
	hdr->b_l1hdr.b_byteswap == DMU_BSWAP_NUMFUNCS &&
	!HDR_SHARED_DATA(hdr) &&
	(ARC_BUF_LAST(buf) \|\| ARC_BUF_COMPRESSED(buf)));
	}

	/*
	* Allocate a buf for this hdr. If you care about the data that's in the hdr,
	* or if you want a compressed buffer, pass those flags in. Returns 0 if the
	* copy was made successfully, or an error code otherwise.
	*/
	static int
	arc_buf_alloc_impl(arc_buf_hdr_t hdr, spa_t spa, const zbookmark_phys_t *zb,
	void *tag, boolean_t encrypted, boolean_t compressed, boolean_t noauth,
	boolean_t fill, arc_buf_t **ret)
	{
	arc_buf_t *buf;
	arc_fill_flags_t flags = ARC_FILL_LOCKED;

	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT3U(HDR_GET_LSIZE(hdr), >, 0);
	VERIFY(hdr->b_type == ARC_BUFC_DATA \|\|
	hdr->b_type == ARC_BUFC_METADATA);
	ASSERT3P(ret, !=, NULL);
	ASSERT3P(*ret, ==, NULL);
	IMPLY(encrypted, compressed);

	- hdr->b_l1hdr.b_mru_hits = 0;
	- hdr->b_l1hdr.b_mru_ghost_hits = 0;
	- hdr->b_l1hdr.b_mfu_hits = 0;
	- hdr->b_l1hdr.b_mfu_ghost_hits = 0;
	- hdr->b_l1hdr.b_l2_hits = 0;
	-
	buf = *ret = kmem_cache_alloc(buf_cache, KM_PUSHPAGE);
	buf->b_hdr = hdr;
	buf->b_data = NULL;
	buf->b_next = hdr->b_l1hdr.b_buf;
	buf->b_flags = 0;

	add_reference(hdr, tag);

	/*
	* We're about to change the hdr's b_flags. We must either
	* hold the hash_lock or be undiscoverable.
	*/
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));

	/*
	* Only honor requests for compressed bufs if the hdr is actually
	* compressed. This must be overridden if the buffer is encrypted since
	* encrypted buffers cannot be decompressed.
	*/
	if (encrypted) {
	buf->b_flags \|= ARC_BUF_FLAG_COMPRESSED;
	buf->b_flags \|= ARC_BUF_FLAG_ENCRYPTED;
	flags \|= ARC_FILL_COMPRESSED \| ARC_FILL_ENCRYPTED;
	} else if (compressed &&
	arc_hdr_get_compress(hdr) != ZIO_COMPRESS_OFF) {
	buf->b_flags \|= ARC_BUF_FLAG_COMPRESSED;
	flags \|= ARC_FILL_COMPRESSED;
	}

	if (noauth) {
	ASSERT0(encrypted);
	flags \|= ARC_FILL_NOAUTH;
	}

	/*
	* If the hdr's data can be shared then we share the data buffer and
	* set the appropriate bit in the hdr's b_flags to indicate the hdr is
	* sharing it's b_pabd with the arc_buf_t. Otherwise, we allocate a new
	* buffer to store the buf's data.
	*
	* There are two additional restrictions here because we're sharing
	* hdr -> buf instead of the usual buf -> hdr. First, the hdr can't be
	* actively involved in an L2ARC write, because if this buf is used by
	* an arc_write() then the hdr's data buffer will be released when the
	* write completes, even though the L2ARC write might still be using it.
	* Second, the hdr's ABD must be linear so that the buf's user doesn't
	* need to be ABD-aware. It must be allocated via
	* zio_[data_]buf_alloc(), not as a page, because we need to be able
	* to abd_release_ownership_of_buf(), which isn't allowed on "linear
	* page" buffers because the ABD code needs to handle freeing them
	* specially.
	*/
	boolean_t can_share = arc_can_share(hdr, buf) &&
	!HDR_L2_WRITING(hdr) &&
	hdr->b_l1hdr.b_pabd != NULL &&
	abd_is_linear(hdr->b_l1hdr.b_pabd) &&
	!abd_is_linear_page(hdr->b_l1hdr.b_pabd);

	/* Set up b_data and sharing */
	if (can_share) {
	buf->b_data = abd_to_buf(hdr->b_l1hdr.b_pabd);
	buf->b_flags \|= ARC_BUF_FLAG_SHARED;
	arc_hdr_set_flags(hdr, ARC_FLAG_SHARED_DATA);
	} else {
	buf->b_data =
	arc_get_data_buf(hdr, arc_buf_size(buf), buf);
	ARCSTAT_INCR(arcstat_overhead_size, arc_buf_size(buf));
	}
	VERIFY3P(buf->b_data, !=, NULL);

	hdr->b_l1hdr.b_buf = buf;
	hdr->b_l1hdr.b_bufcnt += 1;
	if (encrypted)
	hdr->b_crypt_hdr.b_ebufcnt += 1;

	/*
	* If the user wants the data from the hdr, we need to either copy or
	* decompress the data.
	*/
	if (fill) {
	ASSERT3P(zb, !=, NULL);
	return (arc_buf_fill(buf, spa, zb, flags));
	}

	return (0);
	}

	static char *arc_onloan_tag = "onloan";

	static inline void
	arc_loaned_bytes_update(int64_t delta)
	{
	atomic_add_64(&arc_loaned_bytes, delta);

	/* assert that it did not wrap around */
	ASSERT3S(atomic_add_64_nv(&arc_loaned_bytes, 0), >=, 0);
	}

	/*
	* Loan out an anonymous arc buffer. Loaned buffers are not counted as in
	* flight data by arc_tempreserve_space() until they are "returned". Loaned
	* buffers must be returned to the arc before they can be used by the DMU or
	* freed.
	*/
	arc_buf_t *
	arc_loan_buf(spa_t *spa, boolean_t is_metadata, int size)
	{
	arc_buf_t *buf = arc_alloc_buf(spa, arc_onloan_tag,
	is_metadata ? ARC_BUFC_METADATA : ARC_BUFC_DATA, size);

	arc_loaned_bytes_update(arc_buf_size(buf));

	return (buf);
	}

	arc_buf_t *
	arc_loan_compressed_buf(spa_t *spa, uint64_t psize, uint64_t lsize,
	enum zio_compress compression_type, uint8_t complevel)
	{
	arc_buf_t *buf = arc_alloc_compressed_buf(spa, arc_onloan_tag,
	psize, lsize, compression_type, complevel);

	arc_loaned_bytes_update(arc_buf_size(buf));

	return (buf);
	}

	arc_buf_t *
	arc_loan_raw_buf(spa_t *spa, uint64_t dsobj, boolean_t byteorder,
	const uint8_t salt, const uint8_t iv, const uint8_t *mac,
	dmu_object_type_t ot, uint64_t psize, uint64_t lsize,
	enum zio_compress compression_type, uint8_t complevel)
	{
	arc_buf_t *buf = arc_alloc_raw_buf(spa, arc_onloan_tag, dsobj,
	byteorder, salt, iv, mac, ot, psize, lsize, compression_type,
	complevel);

	atomic_add_64(&arc_loaned_bytes, psize);
	return (buf);
	}


	/*
	* Return a loaned arc buffer to the arc.
	*/
	void
	arc_return_buf(arc_buf_t buf, void tag)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	ASSERT3P(buf->b_data, !=, NULL);
	ASSERT(HDR_HAS_L1HDR(hdr));
	(void) zfs_refcount_add(&hdr->b_l1hdr.b_refcnt, tag);
	(void) zfs_refcount_remove(&hdr->b_l1hdr.b_refcnt, arc_onloan_tag);

	arc_loaned_bytes_update(-arc_buf_size(buf));
	}

	/* Detach an arc_buf from a dbuf (tag) */
	void
	arc_loan_inuse_buf(arc_buf_t buf, void tag)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	ASSERT3P(buf->b_data, !=, NULL);
	ASSERT(HDR_HAS_L1HDR(hdr));
	(void) zfs_refcount_add(&hdr->b_l1hdr.b_refcnt, arc_onloan_tag);
	(void) zfs_refcount_remove(&hdr->b_l1hdr.b_refcnt, tag);

	arc_loaned_bytes_update(arc_buf_size(buf));
	}

	static void
	l2arc_free_abd_on_write(abd_t *abd, size_t size, arc_buf_contents_t type)
	{
	l2arc_data_free_t df = kmem_alloc(sizeof (df), KM_SLEEP);

	df->l2df_abd = abd;
	df->l2df_size = size;
	df->l2df_type = type;
	mutex_enter(&l2arc_free_on_write_mtx);
	list_insert_head(l2arc_free_on_write, df);
	mutex_exit(&l2arc_free_on_write_mtx);
	}

	static void
	arc_hdr_free_on_write(arc_buf_hdr_t *hdr, boolean_t free_rdata)
	{
	arc_state_t *state = hdr->b_l1hdr.b_state;
	arc_buf_contents_t type = arc_buf_type(hdr);
	uint64_t size = (free_rdata) ? HDR_GET_PSIZE(hdr) : arc_hdr_size(hdr);

	/* protected by hash lock, if in the hash table */
	if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
	ASSERT(state != arc_anon && state != arc_l2c_only);

	(void) zfs_refcount_remove_many(&state->arcs_esize[type],
	size, hdr);
	}
	(void) zfs_refcount_remove_many(&state->arcs_size, size, hdr);
	if (type == ARC_BUFC_METADATA) {
	arc_space_return(size, ARC_SPACE_META);
	} else {
	ASSERT(type == ARC_BUFC_DATA);
	arc_space_return(size, ARC_SPACE_DATA);
	}

	if (free_rdata) {
	l2arc_free_abd_on_write(hdr->b_crypt_hdr.b_rabd, size, type);
	} else {
	l2arc_free_abd_on_write(hdr->b_l1hdr.b_pabd, size, type);
	}
	}

	/*
	* Share the arc_buf_t's data with the hdr. Whenever we are sharing the
	* data buffer, we transfer the refcount ownership to the hdr and update
	* the appropriate kstats.
	*/
	static void
	arc_share_buf(arc_buf_hdr_t hdr, arc_buf_t buf)
	{
	ASSERT(arc_can_share(hdr, buf));
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!ARC_BUF_ENCRYPTED(buf));
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));

	/*
	* Start sharing the data buffer. We transfer the
	* refcount ownership to the hdr since it always owns
	* the refcount whenever an arc_buf_t is shared.
	*/
	zfs_refcount_transfer_ownership_many(&hdr->b_l1hdr.b_state->arcs_size,
	arc_hdr_size(hdr), buf, hdr);
	hdr->b_l1hdr.b_pabd = abd_get_from_buf(buf->b_data, arc_buf_size(buf));
	abd_take_ownership_of_buf(hdr->b_l1hdr.b_pabd,
	HDR_ISTYPE_METADATA(hdr));
	arc_hdr_set_flags(hdr, ARC_FLAG_SHARED_DATA);
	buf->b_flags \|= ARC_BUF_FLAG_SHARED;

	/*
	* Since we've transferred ownership to the hdr we need
	* to increment its compressed and uncompressed kstats and
	* decrement the overhead size.
	*/
	ARCSTAT_INCR(arcstat_compressed_size, arc_hdr_size(hdr));
	ARCSTAT_INCR(arcstat_uncompressed_size, HDR_GET_LSIZE(hdr));
	ARCSTAT_INCR(arcstat_overhead_size, -arc_buf_size(buf));
	}

	static void
	arc_unshare_buf(arc_buf_hdr_t hdr, arc_buf_t buf)
	{
	ASSERT(arc_buf_is_shared(buf));
	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));

	/*
	* We are no longer sharing this buffer so we need
	* to transfer its ownership to the rightful owner.
	*/
	zfs_refcount_transfer_ownership_many(&hdr->b_l1hdr.b_state->arcs_size,
	arc_hdr_size(hdr), hdr, buf);
	arc_hdr_clear_flags(hdr, ARC_FLAG_SHARED_DATA);
	abd_release_ownership_of_buf(hdr->b_l1hdr.b_pabd);
	abd_free(hdr->b_l1hdr.b_pabd);
	hdr->b_l1hdr.b_pabd = NULL;
	buf->b_flags &= ~ARC_BUF_FLAG_SHARED;

	/*
	* Since the buffer is no longer shared between
	* the arc buf and the hdr, count it as overhead.
	*/
	ARCSTAT_INCR(arcstat_compressed_size, -arc_hdr_size(hdr));
	ARCSTAT_INCR(arcstat_uncompressed_size, -HDR_GET_LSIZE(hdr));
	ARCSTAT_INCR(arcstat_overhead_size, arc_buf_size(buf));
	}

	/*
	* Remove an arc_buf_t from the hdr's buf list and return the last
	* arc_buf_t on the list. If no buffers remain on the list then return
	* NULL.
	*/
	static arc_buf_t *
	arc_buf_remove(arc_buf_hdr_t hdr, arc_buf_t buf)
	{
	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));

	arc_buf_t **bufp = &hdr->b_l1hdr.b_buf;
	arc_buf_t *lastbuf = NULL;

	/*
	* Remove the buf from the hdr list and locate the last
	* remaining buffer on the list.
	*/
	while (*bufp != NULL) {
	if (*bufp == buf)
	*bufp = buf->b_next;

	/*
	* If we've removed a buffer in the middle of
	* the list then update the lastbuf and update
	* bufp.
	*/
	if (*bufp != NULL) {
	lastbuf = *bufp;
	bufp = &(*bufp)->b_next;
	}
	}
	buf->b_next = NULL;
	ASSERT3P(lastbuf, !=, buf);
	IMPLY(hdr->b_l1hdr.b_bufcnt > 0, lastbuf != NULL);
	IMPLY(hdr->b_l1hdr.b_bufcnt > 0, hdr->b_l1hdr.b_buf != NULL);
	IMPLY(lastbuf != NULL, ARC_BUF_LAST(lastbuf));

	return (lastbuf);
	}

	/*
	* Free up buf->b_data and pull the arc_buf_t off of the arc_buf_hdr_t's
	* list and free it.
	*/
	static void
	arc_buf_destroy_impl(arc_buf_t *buf)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	/*
	* Free up the data associated with the buf but only if we're not
	* sharing this with the hdr. If we are sharing it with the hdr, the
	* hdr is responsible for doing the free.
	*/
	if (buf->b_data != NULL) {
	/*
	* We're about to change the hdr's b_flags. We must either
	* hold the hash_lock or be undiscoverable.
	*/
	ASSERT(HDR_EMPTY_OR_LOCKED(hdr));

	arc_cksum_verify(buf);
	arc_buf_unwatch(buf);

	if (arc_buf_is_shared(buf)) {
	arc_hdr_clear_flags(hdr, ARC_FLAG_SHARED_DATA);
	} else {
	uint64_t size = arc_buf_size(buf);
	arc_free_data_buf(hdr, buf->b_data, size, buf);
	ARCSTAT_INCR(arcstat_overhead_size, -size);
	}
	buf->b_data = NULL;

	ASSERT(hdr->b_l1hdr.b_bufcnt > 0);
	hdr->b_l1hdr.b_bufcnt -= 1;

	if (ARC_BUF_ENCRYPTED(buf)) {
	hdr->b_crypt_hdr.b_ebufcnt -= 1;

	/*
	* If we have no more encrypted buffers and we've
	* already gotten a copy of the decrypted data we can
	* free b_rabd to save some space.
	*/
	if (hdr->b_crypt_hdr.b_ebufcnt == 0 &&
	HDR_HAS_RABD(hdr) && hdr->b_l1hdr.b_pabd != NULL &&
	!HDR_IO_IN_PROGRESS(hdr)) {
	arc_hdr_free_abd(hdr, B_TRUE);
	}
	}
	}

	arc_buf_t *lastbuf = arc_buf_remove(hdr, buf);

	if (ARC_BUF_SHARED(buf) && !ARC_BUF_COMPRESSED(buf)) {
	/*
	* If the current arc_buf_t is sharing its data buffer with the
	* hdr, then reassign the hdr's b_pabd to share it with the new
	* buffer at the end of the list. The shared buffer is always
	* the last one on the hdr's buffer list.
	*
	* There is an equivalent case for compressed bufs, but since
	* they aren't guaranteed to be the last buf in the list and
	* that is an exceedingly rare case, we just allow that space be
	* wasted temporarily. We must also be careful not to share
	* encrypted buffers, since they cannot be shared.
	*/
	if (lastbuf != NULL && !ARC_BUF_ENCRYPTED(lastbuf)) {
	/* Only one buf can be shared at once */
	VERIFY(!arc_buf_is_shared(lastbuf));
	/* hdr is uncompressed so can't have compressed buf */
	VERIFY(!ARC_BUF_COMPRESSED(lastbuf));

	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
	arc_hdr_free_abd(hdr, B_FALSE);

	/*
	* We must setup a new shared block between the
	* last buffer and the hdr. The data would have
	* been allocated by the arc buf so we need to transfer
	* ownership to the hdr since it's now being shared.
	*/
	arc_share_buf(hdr, lastbuf);
	}
	} else if (HDR_SHARED_DATA(hdr)) {
	/*
	* Uncompressed shared buffers are always at the end
	* of the list. Compressed buffers don't have the
	* same requirements. This makes it hard to
	* simply assert that the lastbuf is shared so
	* we rely on the hdr's compression flags to determine
	* if we have a compressed, shared buffer.
	*/
	ASSERT3P(lastbuf, !=, NULL);
	ASSERT(arc_buf_is_shared(lastbuf) \|\|
	arc_hdr_get_compress(hdr) != ZIO_COMPRESS_OFF);
	}

	/*
	* Free the checksum if we're removing the last uncompressed buf from
	* this hdr.
	*/
	if (!arc_hdr_has_uncompressed_buf(hdr)) {
	arc_cksum_free(hdr);
	}

	/* clean up the buf */
	buf->b_hdr = NULL;
	kmem_cache_free(buf_cache, buf);
	}

	static void
	arc_hdr_alloc_abd(arc_buf_hdr_t *hdr, int alloc_flags)
	{
	uint64_t size;
	boolean_t alloc_rdata = ((alloc_flags & ARC_HDR_ALLOC_RDATA) != 0);
	- boolean_t do_adapt = ((alloc_flags & ARC_HDR_DO_ADAPT) != 0);

	ASSERT3U(HDR_GET_LSIZE(hdr), >, 0);
	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT(!HDR_SHARED_DATA(hdr) \|\| alloc_rdata);
	IMPLY(alloc_rdata, HDR_PROTECTED(hdr));

	if (alloc_rdata) {
	size = HDR_GET_PSIZE(hdr);
	ASSERT3P(hdr->b_crypt_hdr.b_rabd, ==, NULL);
	hdr->b_crypt_hdr.b_rabd = arc_get_data_abd(hdr, size, hdr,
	- do_adapt);
	+ alloc_flags);
	ASSERT3P(hdr->b_crypt_hdr.b_rabd, !=, NULL);
	ARCSTAT_INCR(arcstat_raw_size, size);
	} else {
	size = arc_hdr_size(hdr);
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	hdr->b_l1hdr.b_pabd = arc_get_data_abd(hdr, size, hdr,
	- do_adapt);
	+ alloc_flags);
	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
	}

	ARCSTAT_INCR(arcstat_compressed_size, size);
	ARCSTAT_INCR(arcstat_uncompressed_size, HDR_GET_LSIZE(hdr));
	}

	static void
	arc_hdr_free_abd(arc_buf_hdr_t *hdr, boolean_t free_rdata)
	{
	uint64_t size = (free_rdata) ? HDR_GET_PSIZE(hdr) : arc_hdr_size(hdr);

	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT(hdr->b_l1hdr.b_pabd != NULL \|\| HDR_HAS_RABD(hdr));
	IMPLY(free_rdata, HDR_HAS_RABD(hdr));

	/*
	* If the hdr is currently being written to the l2arc then
	* we defer freeing the data by adding it to the l2arc_free_on_write
	* list. The l2arc will free the data once it's finished
	* writing it to the l2arc device.
	*/
	if (HDR_L2_WRITING(hdr)) {
	arc_hdr_free_on_write(hdr, free_rdata);
	ARCSTAT_BUMP(arcstat_l2_free_on_write);
	} else if (free_rdata) {
	arc_free_data_abd(hdr, hdr->b_crypt_hdr.b_rabd, size, hdr);
	} else {
	arc_free_data_abd(hdr, hdr->b_l1hdr.b_pabd, size, hdr);
	}

	if (free_rdata) {
	hdr->b_crypt_hdr.b_rabd = NULL;
	ARCSTAT_INCR(arcstat_raw_size, -size);
	} else {
	hdr->b_l1hdr.b_pabd = NULL;
	}

	if (hdr->b_l1hdr.b_pabd == NULL && !HDR_HAS_RABD(hdr))
	hdr->b_l1hdr.b_byteswap = DMU_BSWAP_NUMFUNCS;

	ARCSTAT_INCR(arcstat_compressed_size, -size);
	ARCSTAT_INCR(arcstat_uncompressed_size, -HDR_GET_LSIZE(hdr));
	}

	+/*
	+ * Allocate empty anonymous ARC header. The header will get its identity
	+ * assigned and buffers attached later as part of read or write operations.
	+ *
	+ * In case of read arc_read() assigns header its identify (b_dva + b_birth),
	+ * inserts it into ARC hash to become globally visible and allocates physical
	+ * (b_pabd) or raw (b_rabd) ABD buffer to read into from disk. On disk read
	+ * completion arc_read_done() allocates ARC buffer(s) as needed, potentially
	+ * sharing one of them with the physical ABD buffer.
	+ *
	+ * In case of write arc_alloc_buf() allocates ARC buffer to be filled with
	+ * data. Then after compression and/or encryption arc_write_ready() allocates
	+ * and fills (or potentially shares) physical (b_pabd) or raw (b_rabd) ABD
	+ * buffer. On disk write completion arc_write_done() assigns the header its
	+ * new identity (b_dva + b_birth) and inserts into ARC hash.
	+ *
	+ * In case of partial overwrite the old data is read first as described. Then
	+ * arc_release() either allocates new anonymous ARC header and moves the ARC
	+ * buffer to it, or reuses the old ARC header by discarding its identity and
	+ * removing it from ARC hash. After buffer modification normal write process
	+ * follows as described.
	+ */
	static arc_buf_hdr_t *
	arc_hdr_alloc(uint64_t spa, int32_t psize, int32_t lsize,
	boolean_t protected, enum zio_compress compression_type, uint8_t complevel,
	- arc_buf_contents_t type, boolean_t alloc_rdata)
	+ arc_buf_contents_t type)
	{
	arc_buf_hdr_t *hdr;
	- int flags = ARC_HDR_DO_ADAPT;

	VERIFY(type == ARC_BUFC_DATA \|\| type == ARC_BUFC_METADATA);
	if (protected) {
	hdr = kmem_cache_alloc(hdr_full_crypt_cache, KM_PUSHPAGE);
	} else {
	hdr = kmem_cache_alloc(hdr_full_cache, KM_PUSHPAGE);
	}
	- flags \|= alloc_rdata ? ARC_HDR_ALLOC_RDATA : 0;

	ASSERT(HDR_EMPTY(hdr));
	ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);
	HDR_SET_PSIZE(hdr, psize);
	HDR_SET_LSIZE(hdr, lsize);
	hdr->b_spa = spa;
	hdr->b_type = type;
	hdr->b_flags = 0;
	arc_hdr_set_flags(hdr, arc_bufc_to_flags(type) \| ARC_FLAG_HAS_L1HDR);
	arc_hdr_set_compress(hdr, compression_type);
	hdr->b_complevel = complevel;
	if (protected)
	arc_hdr_set_flags(hdr, ARC_FLAG_PROTECTED);

	hdr->b_l1hdr.b_state = arc_anon;
	hdr->b_l1hdr.b_arc_access = 0;
	+ hdr->b_l1hdr.b_mru_hits = 0;
	+ hdr->b_l1hdr.b_mru_ghost_hits = 0;
	+ hdr->b_l1hdr.b_mfu_hits = 0;
	+ hdr->b_l1hdr.b_mfu_ghost_hits = 0;
	hdr->b_l1hdr.b_bufcnt = 0;
	hdr->b_l1hdr.b_buf = NULL;

	- /*
	- * Allocate the hdr's buffer. This will contain either
	- * the compressed or uncompressed data depending on the block
	- * it references and compressed arc enablement.
	- */
	- arc_hdr_alloc_abd(hdr, flags);
	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));

	return (hdr);
	}

	/*
	* Transition between the two allocation states for the arc_buf_hdr struct.
	* The arc_buf_hdr struct can be allocated with (hdr_full_cache) or without
	* (hdr_l2only_cache) the fields necessary for the L1 cache - the smaller
	* version is used when a cache buffer is only in the L2ARC in order to reduce
	* memory usage.
	*/
	static arc_buf_hdr_t *
	arc_hdr_realloc(arc_buf_hdr_t hdr, kmem_cache_t old, kmem_cache_t *new)
	{
	ASSERT(HDR_HAS_L2HDR(hdr));

	arc_buf_hdr_t *nhdr;
	l2arc_dev_t *dev = hdr->b_l2hdr.b_dev;

	ASSERT((old == hdr_full_cache && new == hdr_l2only_cache) \|\|
	(old == hdr_l2only_cache && new == hdr_full_cache));

	/*
	* if the caller wanted a new full header and the header is to be
	* encrypted we will actually allocate the header from the full crypt
	* cache instead. The same applies to freeing from the old cache.
	*/
	if (HDR_PROTECTED(hdr) && new == hdr_full_cache)
	new = hdr_full_crypt_cache;
	if (HDR_PROTECTED(hdr) && old == hdr_full_cache)
	old = hdr_full_crypt_cache;

	nhdr = kmem_cache_alloc(new, KM_PUSHPAGE);

	ASSERT(MUTEX_HELD(HDR_LOCK(hdr)));
	buf_hash_remove(hdr);

	bcopy(hdr, nhdr, HDR_L2ONLY_SIZE);

	if (new == hdr_full_cache \|\| new == hdr_full_crypt_cache) {
	arc_hdr_set_flags(nhdr, ARC_FLAG_HAS_L1HDR);
	/*
	* arc_access and arc_change_state need to be aware that a
	* header has just come out of L2ARC, so we set its state to
	* l2c_only even though it's about to change.
	*/
	nhdr->b_l1hdr.b_state = arc_l2c_only;

	/* Verify previous threads set to NULL before freeing */
	ASSERT3P(nhdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!HDR_HAS_RABD(hdr));
	} else {
	ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
	ASSERT0(hdr->b_l1hdr.b_bufcnt);
	ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);

	/*
	* If we've reached here, We must have been called from
	* arc_evict_hdr(), as such we should have already been
	* removed from any ghost list we were previously on
	* (which protects us from racing with arc_evict_state),
	* thus no locking is needed during this check.
	*/
	ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));

	/*
	* A buffer must not be moved into the arc_l2c_only
	* state if it's not finished being written out to the
	* l2arc device. Otherwise, the b_l1hdr.b_pabd field
	* might try to be accessed, even though it was removed.
	*/
	VERIFY(!HDR_L2_WRITING(hdr));
	VERIFY3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!HDR_HAS_RABD(hdr));

	arc_hdr_clear_flags(nhdr, ARC_FLAG_HAS_L1HDR);
	}
	/*
	* The header has been reallocated so we need to re-insert it into any
	* lists it was on.
	*/
	(void) buf_hash_insert(nhdr, NULL);

	ASSERT(list_link_active(&hdr->b_l2hdr.b_l2node));

	mutex_enter(&dev->l2ad_mtx);

	/*
	* We must place the realloc'ed header back into the list at
	* the same spot. Otherwise, if it's placed earlier in the list,
	* l2arc_write_buffers() could find it during the function's
	* write phase, and try to write it out to the l2arc.
	*/
	list_insert_after(&dev->l2ad_buflist, hdr, nhdr);
	list_remove(&dev->l2ad_buflist, hdr);

	mutex_exit(&dev->l2ad_mtx);

	/*
	* Since we're using the pointer address as the tag when
	* incrementing and decrementing the l2ad_alloc refcount, we
	* must remove the old pointer (that we're about to destroy) and
	* add the new pointer to the refcount. Otherwise we'd remove
	* the wrong pointer address when calling arc_hdr_destroy() later.
	*/

	(void) zfs_refcount_remove_many(&dev->l2ad_alloc,
	arc_hdr_size(hdr), hdr);
	(void) zfs_refcount_add_many(&dev->l2ad_alloc,
	arc_hdr_size(nhdr), nhdr);

	buf_discard_identity(hdr);
	kmem_cache_free(old, hdr);

	return (nhdr);
	}

	/*
	* This function allows an L1 header to be reallocated as a crypt
	* header and vice versa. If we are going to a crypt header, the
	* new fields will be zeroed out.
	*/
	static arc_buf_hdr_t *
	arc_hdr_realloc_crypt(arc_buf_hdr_t *hdr, boolean_t need_crypt)
	{
	arc_buf_hdr_t *nhdr;
	arc_buf_t *buf;
	kmem_cache_t ncache, ocache;
	unsigned nsize, osize;

	/*
	* This function requires that hdr is in the arc_anon state.
	* Therefore it won't have any L2ARC data for us to worry
	* about copying.
	*/
	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT(!HDR_HAS_L2HDR(hdr));
	ASSERT3U(!!HDR_PROTECTED(hdr), !=, need_crypt);
	ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
	ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
	ASSERT(!list_link_active(&hdr->b_l2hdr.b_l2node));
	ASSERT3P(hdr->b_hash_next, ==, NULL);

	if (need_crypt) {
	ncache = hdr_full_crypt_cache;
	nsize = sizeof (hdr->b_crypt_hdr);
	ocache = hdr_full_cache;
	osize = HDR_FULL_SIZE;
	} else {
	ncache = hdr_full_cache;
	nsize = HDR_FULL_SIZE;
	ocache = hdr_full_crypt_cache;
	osize = sizeof (hdr->b_crypt_hdr);
	}

	nhdr = kmem_cache_alloc(ncache, KM_PUSHPAGE);

	/*
	* Copy all members that aren't locks or condvars to the new header.
	* No lists are pointing to us (as we asserted above), so we don't
	* need to worry about the list nodes.
	*/
	nhdr->b_dva = hdr->b_dva;
	nhdr->b_birth = hdr->b_birth;
	nhdr->b_type = hdr->b_type;
	nhdr->b_flags = hdr->b_flags;
	nhdr->b_psize = hdr->b_psize;
	nhdr->b_lsize = hdr->b_lsize;
	nhdr->b_spa = hdr->b_spa;
	nhdr->b_l1hdr.b_freeze_cksum = hdr->b_l1hdr.b_freeze_cksum;
	nhdr->b_l1hdr.b_bufcnt = hdr->b_l1hdr.b_bufcnt;
	nhdr->b_l1hdr.b_byteswap = hdr->b_l1hdr.b_byteswap;
	nhdr->b_l1hdr.b_state = hdr->b_l1hdr.b_state;
	nhdr->b_l1hdr.b_arc_access = hdr->b_l1hdr.b_arc_access;
	nhdr->b_l1hdr.b_mru_hits = hdr->b_l1hdr.b_mru_hits;
	nhdr->b_l1hdr.b_mru_ghost_hits = hdr->b_l1hdr.b_mru_ghost_hits;
	nhdr->b_l1hdr.b_mfu_hits = hdr->b_l1hdr.b_mfu_hits;
	nhdr->b_l1hdr.b_mfu_ghost_hits = hdr->b_l1hdr.b_mfu_ghost_hits;
	- nhdr->b_l1hdr.b_l2_hits = hdr->b_l1hdr.b_l2_hits;
	nhdr->b_l1hdr.b_acb = hdr->b_l1hdr.b_acb;
	nhdr->b_l1hdr.b_pabd = hdr->b_l1hdr.b_pabd;

	/*
	* This zfs_refcount_add() exists only to ensure that the individual
	* arc buffers always point to a header that is referenced, avoiding
	* a small race condition that could trigger ASSERTs.
	*/
	(void) zfs_refcount_add(&nhdr->b_l1hdr.b_refcnt, FTAG);
	nhdr->b_l1hdr.b_buf = hdr->b_l1hdr.b_buf;
	for (buf = nhdr->b_l1hdr.b_buf; buf != NULL; buf = buf->b_next) {
	mutex_enter(&buf->b_evict_lock);
	buf->b_hdr = nhdr;
	mutex_exit(&buf->b_evict_lock);
	}

	zfs_refcount_transfer(&nhdr->b_l1hdr.b_refcnt, &hdr->b_l1hdr.b_refcnt);
	(void) zfs_refcount_remove(&nhdr->b_l1hdr.b_refcnt, FTAG);
	ASSERT0(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt));

	if (need_crypt) {
	arc_hdr_set_flags(nhdr, ARC_FLAG_PROTECTED);
	} else {
	arc_hdr_clear_flags(nhdr, ARC_FLAG_PROTECTED);
	}

	/* unset all members of the original hdr */
	bzero(&hdr->b_dva, sizeof (dva_t));
	hdr->b_birth = 0;
	hdr->b_type = ARC_BUFC_INVALID;
	hdr->b_flags = 0;
	hdr->b_psize = 0;
	hdr->b_lsize = 0;
	hdr->b_spa = 0;
	hdr->b_l1hdr.b_freeze_cksum = NULL;
	hdr->b_l1hdr.b_buf = NULL;
	hdr->b_l1hdr.b_bufcnt = 0;
	hdr->b_l1hdr.b_byteswap = 0;
	hdr->b_l1hdr.b_state = NULL;
	hdr->b_l1hdr.b_arc_access = 0;
	hdr->b_l1hdr.b_mru_hits = 0;
	hdr->b_l1hdr.b_mru_ghost_hits = 0;
	hdr->b_l1hdr.b_mfu_hits = 0;
	hdr->b_l1hdr.b_mfu_ghost_hits = 0;
	- hdr->b_l1hdr.b_l2_hits = 0;
	hdr->b_l1hdr.b_acb = NULL;
	hdr->b_l1hdr.b_pabd = NULL;

	if (ocache == hdr_full_crypt_cache) {
	ASSERT(!HDR_HAS_RABD(hdr));
	hdr->b_crypt_hdr.b_ot = DMU_OT_NONE;
	hdr->b_crypt_hdr.b_ebufcnt = 0;
	hdr->b_crypt_hdr.b_dsobj = 0;
	bzero(hdr->b_crypt_hdr.b_salt, ZIO_DATA_SALT_LEN);
	bzero(hdr->b_crypt_hdr.b_iv, ZIO_DATA_IV_LEN);
	bzero(hdr->b_crypt_hdr.b_mac, ZIO_DATA_MAC_LEN);
	}

	buf_discard_identity(hdr);
	kmem_cache_free(ocache, hdr);

	return (nhdr);
	}

	/*
	* This function is used by the send / receive code to convert a newly
	* allocated arc_buf_t to one that is suitable for a raw encrypted write. It
	* is also used to allow the root objset block to be updated without altering
	* its embedded MACs. Both block types will always be uncompressed so we do not
	* have to worry about compression type or psize.
	*/
	void
	arc_convert_to_raw(arc_buf_t *buf, uint64_t dsobj, boolean_t byteorder,
	dmu_object_type_t ot, const uint8_t salt, const uint8_t iv,
	const uint8_t *mac)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	ASSERT(ot == DMU_OT_DNODE \|\| ot == DMU_OT_OBJSET);
	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);

	buf->b_flags \|= (ARC_BUF_FLAG_COMPRESSED \| ARC_BUF_FLAG_ENCRYPTED);
	if (!HDR_PROTECTED(hdr))
	hdr = arc_hdr_realloc_crypt(hdr, B_TRUE);
	hdr->b_crypt_hdr.b_dsobj = dsobj;
	hdr->b_crypt_hdr.b_ot = ot;
	hdr->b_l1hdr.b_byteswap = (byteorder == ZFS_HOST_BYTEORDER) ?
	DMU_BSWAP_NUMFUNCS : DMU_OT_BYTESWAP(ot);
	if (!arc_hdr_has_uncompressed_buf(hdr))
	arc_cksum_free(hdr);

	if (salt != NULL)
	bcopy(salt, hdr->b_crypt_hdr.b_salt, ZIO_DATA_SALT_LEN);
	if (iv != NULL)
	bcopy(iv, hdr->b_crypt_hdr.b_iv, ZIO_DATA_IV_LEN);
	if (mac != NULL)
	bcopy(mac, hdr->b_crypt_hdr.b_mac, ZIO_DATA_MAC_LEN);
	}

	/*
	* Allocate a new arc_buf_hdr_t and arc_buf_t and return the buf to the caller.
	* The buf is returned thawed since we expect the consumer to modify it.
	*/
	arc_buf_t *
	arc_alloc_buf(spa_t spa, void tag, arc_buf_contents_t type, int32_t size)
	{
	arc_buf_hdr_t *hdr = arc_hdr_alloc(spa_load_guid(spa), size, size,
	- B_FALSE, ZIO_COMPRESS_OFF, 0, type, B_FALSE);
	+ B_FALSE, ZIO_COMPRESS_OFF, 0, type);

	arc_buf_t *buf = NULL;
	VERIFY0(arc_buf_alloc_impl(hdr, spa, NULL, tag, B_FALSE, B_FALSE,
	B_FALSE, B_FALSE, &buf));
	arc_buf_thaw(buf);

	return (buf);
	}

	/*
	* Allocate a compressed buf in the same manner as arc_alloc_buf. Don't use this
	* for bufs containing metadata.
	*/
	arc_buf_t *
	arc_alloc_compressed_buf(spa_t spa, void tag, uint64_t psize, uint64_t lsize,
	enum zio_compress compression_type, uint8_t complevel)
	{
	ASSERT3U(lsize, >, 0);
	ASSERT3U(lsize, >=, psize);
	ASSERT3U(compression_type, >, ZIO_COMPRESS_OFF);
	ASSERT3U(compression_type, <, ZIO_COMPRESS_FUNCTIONS);

	arc_buf_hdr_t *hdr = arc_hdr_alloc(spa_load_guid(spa), psize, lsize,
	- B_FALSE, compression_type, complevel, ARC_BUFC_DATA, B_FALSE);
	+ B_FALSE, compression_type, complevel, ARC_BUFC_DATA);

	arc_buf_t *buf = NULL;
	VERIFY0(arc_buf_alloc_impl(hdr, spa, NULL, tag, B_FALSE,
	B_TRUE, B_FALSE, B_FALSE, &buf));
	arc_buf_thaw(buf);
	ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);

	- if (!arc_buf_is_shared(buf)) {
	- /*
	- * To ensure that the hdr has the correct data in it if we call
	- * arc_untransform() on this buf before it's been written to
	- * disk, it's easiest if we just set up sharing between the
	- * buf and the hdr.
	- */
	- arc_hdr_free_abd(hdr, B_FALSE);
	- arc_share_buf(hdr, buf);
	- }
	+ /*
	+ * To ensure that the hdr has the correct data in it if we call
	+ * arc_untransform() on this buf before it's been written to disk,
	+ * it's easiest if we just set up sharing between the buf and the hdr.
	+ */
	+ arc_share_buf(hdr, buf);

	return (buf);
	}

	arc_buf_t *
	arc_alloc_raw_buf(spa_t spa, void tag, uint64_t dsobj, boolean_t byteorder,
	const uint8_t salt, const uint8_t iv, const uint8_t *mac,
	dmu_object_type_t ot, uint64_t psize, uint64_t lsize,
	enum zio_compress compression_type, uint8_t complevel)
	{
	arc_buf_hdr_t *hdr;
	arc_buf_t *buf;
	arc_buf_contents_t type = DMU_OT_IS_METADATA(ot) ?
	ARC_BUFC_METADATA : ARC_BUFC_DATA;

	ASSERT3U(lsize, >, 0);
	ASSERT3U(lsize, >=, psize);
	ASSERT3U(compression_type, >=, ZIO_COMPRESS_OFF);
	ASSERT3U(compression_type, <, ZIO_COMPRESS_FUNCTIONS);

	hdr = arc_hdr_alloc(spa_load_guid(spa), psize, lsize, B_TRUE,
	- compression_type, complevel, type, B_TRUE);
	+ compression_type, complevel, type);

	hdr->b_crypt_hdr.b_dsobj = dsobj;
	hdr->b_crypt_hdr.b_ot = ot;
	hdr->b_l1hdr.b_byteswap = (byteorder == ZFS_HOST_BYTEORDER) ?
	DMU_BSWAP_NUMFUNCS : DMU_OT_BYTESWAP(ot);
	bcopy(salt, hdr->b_crypt_hdr.b_salt, ZIO_DATA_SALT_LEN);
	bcopy(iv, hdr->b_crypt_hdr.b_iv, ZIO_DATA_IV_LEN);
	bcopy(mac, hdr->b_crypt_hdr.b_mac, ZIO_DATA_MAC_LEN);

	/*
	* This buffer will be considered encrypted even if the ot is not an
	* encrypted type. It will become authenticated instead in
	* arc_write_ready().
	*/
	buf = NULL;
	VERIFY0(arc_buf_alloc_impl(hdr, spa, NULL, tag, B_TRUE, B_TRUE,
	B_FALSE, B_FALSE, &buf));
	arc_buf_thaw(buf);
	ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);

	return (buf);
	}

	static void
	l2arc_hdr_arcstats_update(arc_buf_hdr_t *hdr, boolean_t incr,
	boolean_t state_only)
	{
	l2arc_buf_hdr_t *l2hdr = &hdr->b_l2hdr;
	l2arc_dev_t *dev = l2hdr->b_dev;
	uint64_t lsize = HDR_GET_LSIZE(hdr);
	uint64_t psize = HDR_GET_PSIZE(hdr);
	uint64_t asize = vdev_psize_to_asize(dev->l2ad_vdev, psize);
	arc_buf_contents_t type = hdr->b_type;
	int64_t lsize_s;
	int64_t psize_s;
	int64_t asize_s;

	if (incr) {
	lsize_s = lsize;
	psize_s = psize;
	asize_s = asize;
	} else {
	lsize_s = -lsize;
	psize_s = -psize;
	asize_s = -asize;
	}

	/* If the buffer is a prefetch, count it as such. */
	if (HDR_PREFETCH(hdr)) {
	ARCSTAT_INCR(arcstat_l2_prefetch_asize, asize_s);
	} else {
	/*
	* We use the value stored in the L2 header upon initial
	* caching in L2ARC. This value will be updated in case
	* an MRU/MRU_ghost buffer transitions to MFU but the L2ARC
	* metadata (log entry) cannot currently be updated. Having
	* the ARC state in the L2 header solves the problem of a
	* possibly absent L1 header (apparent in buffers restored
	* from persistent L2ARC).
	*/
	switch (hdr->b_l2hdr.b_arcs_state) {
	case ARC_STATE_MRU_GHOST:
	case ARC_STATE_MRU:
	ARCSTAT_INCR(arcstat_l2_mru_asize, asize_s);
	break;
	case ARC_STATE_MFU_GHOST:
	case ARC_STATE_MFU:
	ARCSTAT_INCR(arcstat_l2_mfu_asize, asize_s);
	break;
	default:
	break;
	}
	}

	if (state_only)
	return;

	ARCSTAT_INCR(arcstat_l2_psize, psize_s);
	ARCSTAT_INCR(arcstat_l2_lsize, lsize_s);

	switch (type) {
	case ARC_BUFC_DATA:
	ARCSTAT_INCR(arcstat_l2_bufc_data_asize, asize_s);
	break;
	case ARC_BUFC_METADATA:
	ARCSTAT_INCR(arcstat_l2_bufc_metadata_asize, asize_s);
	break;
	default:
	break;
	}
	}


	static void
	arc_hdr_l2hdr_destroy(arc_buf_hdr_t *hdr)
	{
	l2arc_buf_hdr_t *l2hdr = &hdr->b_l2hdr;
	l2arc_dev_t *dev = l2hdr->b_dev;
	uint64_t psize = HDR_GET_PSIZE(hdr);
	uint64_t asize = vdev_psize_to_asize(dev->l2ad_vdev, psize);

	ASSERT(MUTEX_HELD(&dev->l2ad_mtx));
	ASSERT(HDR_HAS_L2HDR(hdr));

	list_remove(&dev->l2ad_buflist, hdr);

	l2arc_hdr_arcstats_decrement(hdr);
	vdev_space_update(dev->l2ad_vdev, -asize, 0, 0);

	(void) zfs_refcount_remove_many(&dev->l2ad_alloc, arc_hdr_size(hdr),
	hdr);
	arc_hdr_clear_flags(hdr, ARC_FLAG_HAS_L2HDR);
	}

	static void
	arc_hdr_destroy(arc_buf_hdr_t *hdr)
	{
	if (HDR_HAS_L1HDR(hdr)) {
	ASSERT(hdr->b_l1hdr.b_buf == NULL \|\|
	hdr->b_l1hdr.b_bufcnt > 0);
	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
	ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
	}
	ASSERT(!HDR_IO_IN_PROGRESS(hdr));
	ASSERT(!HDR_IN_HASH_TABLE(hdr));

	if (HDR_HAS_L2HDR(hdr)) {
	l2arc_dev_t *dev = hdr->b_l2hdr.b_dev;
	boolean_t buflist_held = MUTEX_HELD(&dev->l2ad_mtx);

	if (!buflist_held)
	mutex_enter(&dev->l2ad_mtx);

	/*
	* Even though we checked this conditional above, we
	* need to check this again now that we have the
	* l2ad_mtx. This is because we could be racing with
	* another thread calling l2arc_evict() which might have
	* destroyed this header's L2 portion as we were waiting
	* to acquire the l2ad_mtx. If that happens, we don't
	* want to re-destroy the header's L2 portion.
	*/
	if (HDR_HAS_L2HDR(hdr))
	arc_hdr_l2hdr_destroy(hdr);

	if (!buflist_held)
	mutex_exit(&dev->l2ad_mtx);
	}

	/*
	* The header's identify can only be safely discarded once it is no
	* longer discoverable. This requires removing it from the hash table
	* and the l2arc header list. After this point the hash lock can not
	* be used to protect the header.
	*/
	if (!HDR_EMPTY(hdr))
	buf_discard_identity(hdr);

	if (HDR_HAS_L1HDR(hdr)) {
	arc_cksum_free(hdr);

	while (hdr->b_l1hdr.b_buf != NULL)
	arc_buf_destroy_impl(hdr->b_l1hdr.b_buf);

	if (hdr->b_l1hdr.b_pabd != NULL)
	arc_hdr_free_abd(hdr, B_FALSE);

	if (HDR_HAS_RABD(hdr))
	arc_hdr_free_abd(hdr, B_TRUE);
	}

	ASSERT3P(hdr->b_hash_next, ==, NULL);
	if (HDR_HAS_L1HDR(hdr)) {
	ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
	ASSERT3P(hdr->b_l1hdr.b_acb, ==, NULL);

	if (!HDR_PROTECTED(hdr)) {
	kmem_cache_free(hdr_full_cache, hdr);
	} else {
	kmem_cache_free(hdr_full_crypt_cache, hdr);
	}
	} else {
	kmem_cache_free(hdr_l2only_cache, hdr);
	}
	}

	void
	arc_buf_destroy(arc_buf_t buf, void tag)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	if (hdr->b_l1hdr.b_state == arc_anon) {
	ASSERT3U(hdr->b_l1hdr.b_bufcnt, ==, 1);
	ASSERT(!HDR_IO_IN_PROGRESS(hdr));
	VERIFY0(remove_reference(hdr, NULL, tag));
	arc_hdr_destroy(hdr);
	return;
	}

	kmutex_t *hash_lock = HDR_LOCK(hdr);
	mutex_enter(hash_lock);

	ASSERT3P(hdr, ==, buf->b_hdr);
	ASSERT(hdr->b_l1hdr.b_bufcnt > 0);
	ASSERT3P(hash_lock, ==, HDR_LOCK(hdr));
	ASSERT3P(hdr->b_l1hdr.b_state, !=, arc_anon);
	ASSERT3P(buf->b_data, !=, NULL);

	(void) remove_reference(hdr, hash_lock, tag);
	arc_buf_destroy_impl(buf);
	mutex_exit(hash_lock);
	}

	/*
	* Evict the arc_buf_hdr that is provided as a parameter. The resultant
	* state of the header is dependent on its state prior to entering this
	* function. The following transitions are possible:
	*
	* - arc_mru -> arc_mru_ghost
	* - arc_mfu -> arc_mfu_ghost
	* - arc_mru_ghost -> arc_l2c_only
	* - arc_mru_ghost -> deleted
	* - arc_mfu_ghost -> arc_l2c_only
	* - arc_mfu_ghost -> deleted
	+ *
	+ * Return total size of evicted data buffers for eviction progress tracking.
	+ * When evicting from ghost states return logical buffer size to make eviction
	+ * progress at the same (or at least comparable) rate as from non-ghost states.
	+ *
	+ * Return *real_evicted for actual ARC size reduction to wake up threads
	+ * waiting for it. For non-ghost states it includes size of evicted data
	+ * buffers (the headers are not freed there). For ghost states it includes
	+ * only the evicted headers size.
	*/
	static int64_t
	-arc_evict_hdr(arc_buf_hdr_t hdr, kmutex_t hash_lock)
	+arc_evict_hdr(arc_buf_hdr_t hdr, kmutex_t hash_lock, uint64_t *real_evicted)
	{
	arc_state_t evicted_state, state;
	int64_t bytes_evicted = 0;
	int min_lifetime = HDR_PRESCIENT_PREFETCH(hdr) ?
	arc_min_prescient_prefetch_ms : arc_min_prefetch_ms;

	ASSERT(MUTEX_HELD(hash_lock));
	ASSERT(HDR_HAS_L1HDR(hdr));

	+ *real_evicted = 0;
	state = hdr->b_l1hdr.b_state;
	if (GHOST_STATE(state)) {
	ASSERT(!HDR_IO_IN_PROGRESS(hdr));
	ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);

	/*
	* l2arc_write_buffers() relies on a header's L1 portion
	* (i.e. its b_pabd field) during it's write phase.
	* Thus, we cannot push a header onto the arc_l2c_only
	* state (removing its L1 piece) until the header is
	* done being written to the l2arc.
	*/
	if (HDR_HAS_L2HDR(hdr) && HDR_L2_WRITING(hdr)) {
	ARCSTAT_BUMP(arcstat_evict_l2_skip);
	return (bytes_evicted);
	}

	ARCSTAT_BUMP(arcstat_deleted);
	bytes_evicted += HDR_GET_LSIZE(hdr);

	DTRACE_PROBE1(arc__delete, arc_buf_hdr_t *, hdr);

	if (HDR_HAS_L2HDR(hdr)) {
	ASSERT(hdr->b_l1hdr.b_pabd == NULL);
	ASSERT(!HDR_HAS_RABD(hdr));
	/*
	* This buffer is cached on the 2nd Level ARC;
	* don't destroy the header.
	*/
	arc_change_state(arc_l2c_only, hdr, hash_lock);
	/*
	* dropping from L1+L2 cached to L2-only,
	* realloc to remove the L1 header.
	*/
	hdr = arc_hdr_realloc(hdr, hdr_full_cache,
	hdr_l2only_cache);
	+ *real_evicted += HDR_FULL_SIZE - HDR_L2ONLY_SIZE;
	} else {
	arc_change_state(arc_anon, hdr, hash_lock);
	arc_hdr_destroy(hdr);
	+ *real_evicted += HDR_FULL_SIZE;
	}
	return (bytes_evicted);
	}

	ASSERT(state == arc_mru \|\| state == arc_mfu);
	evicted_state = (state == arc_mru) ? arc_mru_ghost : arc_mfu_ghost;

	/* prefetch buffers have a minimum lifespan */
	if (HDR_IO_IN_PROGRESS(hdr) \|\|
	((hdr->b_flags & (ARC_FLAG_PREFETCH \| ARC_FLAG_INDIRECT)) &&
	ddi_get_lbolt() - hdr->b_l1hdr.b_arc_access <
	MSEC_TO_TICK(min_lifetime))) {
	ARCSTAT_BUMP(arcstat_evict_skip);
	return (bytes_evicted);
	}

	ASSERT0(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt));
	while (hdr->b_l1hdr.b_buf) {
	arc_buf_t *buf = hdr->b_l1hdr.b_buf;
	if (!mutex_tryenter(&buf->b_evict_lock)) {
	ARCSTAT_BUMP(arcstat_mutex_miss);
	break;
	}
	- if (buf->b_data != NULL)
	+ if (buf->b_data != NULL) {
	bytes_evicted += HDR_GET_LSIZE(hdr);
	+ *real_evicted += HDR_GET_LSIZE(hdr);
	+ }
	mutex_exit(&buf->b_evict_lock);
	arc_buf_destroy_impl(buf);
	}

	if (HDR_HAS_L2HDR(hdr)) {
	ARCSTAT_INCR(arcstat_evict_l2_cached, HDR_GET_LSIZE(hdr));
	} else {
	if (l2arc_write_eligible(hdr->b_spa, hdr)) {
	ARCSTAT_INCR(arcstat_evict_l2_eligible,
	HDR_GET_LSIZE(hdr));

	switch (state->arcs_state) {
	case ARC_STATE_MRU:
	ARCSTAT_INCR(
	arcstat_evict_l2_eligible_mru,
	HDR_GET_LSIZE(hdr));
	break;
	case ARC_STATE_MFU:
	ARCSTAT_INCR(
	arcstat_evict_l2_eligible_mfu,
	HDR_GET_LSIZE(hdr));
	break;
	default:
	break;
	}
	} else {
	ARCSTAT_INCR(arcstat_evict_l2_ineligible,
	HDR_GET_LSIZE(hdr));
	}
	}

	if (hdr->b_l1hdr.b_bufcnt == 0) {
	arc_cksum_free(hdr);

	bytes_evicted += arc_hdr_size(hdr);
	+ *real_evicted += arc_hdr_size(hdr);

	/*
	* If this hdr is being evicted and has a compressed
	* buffer then we discard it here before we change states.
	* This ensures that the accounting is updated correctly
	* in arc_free_data_impl().
	*/
	if (hdr->b_l1hdr.b_pabd != NULL)
	arc_hdr_free_abd(hdr, B_FALSE);

	if (HDR_HAS_RABD(hdr))
	arc_hdr_free_abd(hdr, B_TRUE);

	arc_change_state(evicted_state, hdr, hash_lock);
	ASSERT(HDR_IN_HASH_TABLE(hdr));
	arc_hdr_set_flags(hdr, ARC_FLAG_IN_HASH_TABLE);
	DTRACE_PROBE1(arc__evict, arc_buf_hdr_t *, hdr);
	}

	return (bytes_evicted);
	}

	static void
	arc_set_need_free(void)
	{
	ASSERT(MUTEX_HELD(&arc_evict_lock));
	int64_t remaining = arc_free_memory() - arc_sys_free / 2;
	arc_evict_waiter_t *aw = list_tail(&arc_evict_waiters);
	if (aw == NULL) {
	arc_need_free = MAX(-remaining, 0);
	} else {
	arc_need_free =
	MAX(-remaining, (int64_t)(aw->aew_count - arc_evict_count));
	}
	}

	static uint64_t
	arc_evict_state_impl(multilist_t ml, int idx, arc_buf_hdr_t marker,
	- uint64_t spa, int64_t bytes)
	+ uint64_t spa, uint64_t bytes)
	{
	multilist_sublist_t *mls;
	- uint64_t bytes_evicted = 0;
	+ uint64_t bytes_evicted = 0, real_evicted = 0;
	arc_buf_hdr_t *hdr;
	kmutex_t *hash_lock;
	- int evict_count = 0;
	+ int evict_count = zfs_arc_evict_batch_limit;

	ASSERT3P(marker, !=, NULL);
	- IMPLY(bytes < 0, bytes == ARC_EVICT_ALL);

	mls = multilist_sublist_lock(ml, idx);

	- for (hdr = multilist_sublist_prev(mls, marker); hdr != NULL;
	+ for (hdr = multilist_sublist_prev(mls, marker); likely(hdr != NULL);
	hdr = multilist_sublist_prev(mls, marker)) {
	- if ((bytes != ARC_EVICT_ALL && bytes_evicted >= bytes) \|\|
	- (evict_count >= zfs_arc_evict_batch_limit))
	+ if ((evict_count <= 0) \|\| (bytes_evicted >= bytes))
	break;

	/*
	* To keep our iteration location, move the marker
	* forward. Since we're not holding hdr's hash lock, we
	* must be very careful and not remove 'hdr' from the
	* sublist. Otherwise, other consumers might mistake the
	* 'hdr' as not being on a sublist when they call the
	* multilist_link_active() function (they all rely on
	* the hash lock protecting concurrent insertions and
	* removals). multilist_sublist_move_forward() was
	* specifically implemented to ensure this is the case
	* (only 'marker' will be removed and re-inserted).
	*/
	multilist_sublist_move_forward(mls, marker);

	/*
	* The only case where the b_spa field should ever be
	* zero, is the marker headers inserted by
	* arc_evict_state(). It's possible for multiple threads
	* to be calling arc_evict_state() concurrently (e.g.
	* dsl_pool_close() and zio_inject_fault()), so we must
	* skip any markers we see from these other threads.
	*/
	if (hdr->b_spa == 0)
	continue;

	/* we're only interested in evicting buffers of a certain spa */
	if (spa != 0 && hdr->b_spa != spa) {
	ARCSTAT_BUMP(arcstat_evict_skip);
	continue;
	}

	hash_lock = HDR_LOCK(hdr);

	/*
	* We aren't calling this function from any code path
	* that would already be holding a hash lock, so we're
	* asserting on this assumption to be defensive in case
	* this ever changes. Without this check, it would be
	* possible to incorrectly increment arcstat_mutex_miss
	* below (e.g. if the code changed such that we called
	* this function with a hash lock held).
	*/
	ASSERT(!MUTEX_HELD(hash_lock));

	if (mutex_tryenter(hash_lock)) {
	- uint64_t evicted = arc_evict_hdr(hdr, hash_lock);
	+ uint64_t revicted;
	+ uint64_t evicted = arc_evict_hdr(hdr, hash_lock,
	+ &revicted);
	mutex_exit(hash_lock);

	bytes_evicted += evicted;
	+ real_evicted += revicted;

	/*
	* If evicted is zero, arc_evict_hdr() must have
	* decided to skip this header, don't increment
	* evict_count in this case.
	*/
	if (evicted != 0)
	- evict_count++;
	+ evict_count--;

	} else {
	ARCSTAT_BUMP(arcstat_mutex_miss);
	}
	}

	multilist_sublist_unlock(mls);

	/*
	* Increment the count of evicted bytes, and wake up any threads that
	* are waiting for the count to reach this value. Since the list is
	* ordered by ascending aew_count, we pop off the beginning of the
	* list until we reach the end, or a waiter that's past the current
	* "count". Doing this outside the loop reduces the number of times
	* we need to acquire the global arc_evict_lock.
	*
	* Only wake when there's sufficient free memory in the system
	* (specifically, arc_sys_free/2, which by default is a bit more than
	* 1/64th of RAM). See the comments in arc_wait_for_eviction().
	*/
	mutex_enter(&arc_evict_lock);
	- arc_evict_count += bytes_evicted;
	+ arc_evict_count += real_evicted;

	if (arc_free_memory() > arc_sys_free / 2) {
	arc_evict_waiter_t *aw;
	while ((aw = list_head(&arc_evict_waiters)) != NULL &&
	aw->aew_count <= arc_evict_count) {
	list_remove(&arc_evict_waiters, aw);
	cv_broadcast(&aw->aew_cv);
	}
	}
	arc_set_need_free();
	mutex_exit(&arc_evict_lock);

	/*
	* If the ARC size is reduced from arc_c_max to arc_c_min (especially
	* if the average cached block is small), eviction can be on-CPU for
	* many seconds. To ensure that other threads that may be bound to
	* this CPU are able to make progress, make a voluntary preemption
	* call here.
	*/
	cond_resched();

	return (bytes_evicted);
	}

	/*
	* Evict buffers from the given arc state, until we've removed the
	* specified number of bytes. Move the removed buffers to the
	* appropriate evict state.
	*
	* This function makes a "best effort". It skips over any buffers
	* it can't get a hash_lock on, and so, may not catch all candidates.
	* It may also return without evicting as much space as requested.
	*
	* If bytes is specified using the special value ARC_EVICT_ALL, this
	* will evict all available (i.e. unlocked and evictable) buffers from
	* the given arc state; which is used by arc_flush().
	*/
	static uint64_t
	-arc_evict_state(arc_state_t *state, uint64_t spa, int64_t bytes,
	+arc_evict_state(arc_state_t *state, uint64_t spa, uint64_t bytes,
	arc_buf_contents_t type)
	{
	uint64_t total_evicted = 0;
	multilist_t *ml = &state->arcs_list[type];
	int num_sublists;
	arc_buf_hdr_t **markers;

	- IMPLY(bytes < 0, bytes == ARC_EVICT_ALL);
	-
	num_sublists = multilist_get_num_sublists(ml);

	/*
	* If we've tried to evict from each sublist, made some
	* progress, but still have not hit the target number of bytes
	* to evict, we want to keep trying. The markers allow us to
	* pick up where we left off for each individual sublist, rather
	* than starting from the tail each time.
	*/
	markers = kmem_zalloc(sizeof (markers) num_sublists, KM_SLEEP);
	for (int i = 0; i < num_sublists; i++) {
	multilist_sublist_t *mls;

	markers[i] = kmem_cache_alloc(hdr_full_cache, KM_SLEEP);

	/*
	* A b_spa of 0 is used to indicate that this header is
	* a marker. This fact is used in arc_evict_type() and
	* arc_evict_state_impl().
	*/
	markers[i]->b_spa = 0;

	mls = multilist_sublist_lock(ml, i);
	multilist_sublist_insert_tail(mls, markers[i]);
	multilist_sublist_unlock(mls);
	}

	/*
	* While we haven't hit our target number of bytes to evict, or
	* we're evicting all available buffers.
	*/
	- while (total_evicted < bytes \|\| bytes == ARC_EVICT_ALL) {
	+ while (total_evicted < bytes) {
	int sublist_idx = multilist_get_random_index(ml);
	uint64_t scan_evicted = 0;

	/*
	* Try to reduce pinned dnodes with a floor of arc_dnode_limit.
	* Request that 10% of the LRUs be scanned by the superblock
	* shrinker.
	*/
	if (type == ARC_BUFC_DATA && aggsum_compare(
	&arc_sums.arcstat_dnode_size, arc_dnode_size_limit) > 0) {
	arc_prune_async((aggsum_upper_bound(
	&arc_sums.arcstat_dnode_size) -
	arc_dnode_size_limit) / sizeof (dnode_t) /
	zfs_arc_dnode_reduce_percent);
	}

	/*
	* Start eviction using a randomly selected sublist,
	* this is to try and evenly balance eviction across all
	* sublists. Always starting at the same sublist
	* (e.g. index 0) would cause evictions to favor certain
	* sublists over others.
	*/
	for (int i = 0; i < num_sublists; i++) {
	uint64_t bytes_remaining;
	uint64_t bytes_evicted;

	- if (bytes == ARC_EVICT_ALL)
	- bytes_remaining = ARC_EVICT_ALL;
	- else if (total_evicted < bytes)
	+ if (total_evicted < bytes)
	bytes_remaining = bytes - total_evicted;
	else
	break;

	bytes_evicted = arc_evict_state_impl(ml, sublist_idx,
	markers[sublist_idx], spa, bytes_remaining);

	scan_evicted += bytes_evicted;
	total_evicted += bytes_evicted;

	/* we've reached the end, wrap to the beginning */
	if (++sublist_idx >= num_sublists)
	sublist_idx = 0;
	}

	/*
	* If we didn't evict anything during this scan, we have
	* no reason to believe we'll evict more during another
	* scan, so break the loop.
	*/
	if (scan_evicted == 0) {
	/* This isn't possible, let's make that obvious */
	ASSERT3S(bytes, !=, 0);

	/*
	* When bytes is ARC_EVICT_ALL, the only way to
	* break the loop is when scan_evicted is zero.
	* In that case, we actually have evicted enough,
	* so we don't want to increment the kstat.
	*/
	if (bytes != ARC_EVICT_ALL) {
	ASSERT3S(total_evicted, <, bytes);
	ARCSTAT_BUMP(arcstat_evict_not_enough);
	}

	break;
	}
	}

	for (int i = 0; i < num_sublists; i++) {
	multilist_sublist_t *mls = multilist_sublist_lock(ml, i);
	multilist_sublist_remove(mls, markers[i]);
	multilist_sublist_unlock(mls);

	kmem_cache_free(hdr_full_cache, markers[i]);
	}
	kmem_free(markers, sizeof (markers) num_sublists);

	return (total_evicted);
	}

	/*
	* Flush all "evictable" data of the given type from the arc state
	* specified. This will not evict any "active" buffers (i.e. referenced).
	*
	* When 'retry' is set to B_FALSE, the function will make a single pass
	* over the state and evict any buffers that it can. Since it doesn't
	* continually retry the eviction, it might end up leaving some buffers
	* in the ARC due to lock misses.
	*
	* When 'retry' is set to B_TRUE, the function will continually retry the
	* eviction until all evictable buffers have been removed from the
	* state. As a result, if concurrent insertions into the state are
	* allowed (e.g. if the ARC isn't shutting down), this function might
	* wind up in an infinite loop, continually trying to evict buffers.
	*/
	static uint64_t
	arc_flush_state(arc_state_t *state, uint64_t spa, arc_buf_contents_t type,
	boolean_t retry)
	{
	uint64_t evicted = 0;

	while (zfs_refcount_count(&state->arcs_esize[type]) != 0) {
	evicted += arc_evict_state(state, spa, ARC_EVICT_ALL, type);

	if (!retry)
	break;
	}

	return (evicted);
	}

	/*
	* Evict the specified number of bytes from the state specified,
	* restricting eviction to the spa and type given. This function
	* prevents us from trying to evict more from a state's list than
	* is "evictable", and to skip evicting altogether when passed a
	* negative value for "bytes". In contrast, arc_evict_state() will
	* evict everything it can, when passed a negative value for "bytes".
	*/
	static uint64_t
	arc_evict_impl(arc_state_t *state, uint64_t spa, int64_t bytes,
	arc_buf_contents_t type)
	{
	- int64_t delta;
	+ uint64_t delta;

	if (bytes > 0 && zfs_refcount_count(&state->arcs_esize[type]) > 0) {
	delta = MIN(zfs_refcount_count(&state->arcs_esize[type]),
	bytes);
	return (arc_evict_state(state, spa, delta, type));
	}

	return (0);
	}

	/*
	* The goal of this function is to evict enough meta data buffers from the
	* ARC in order to enforce the arc_meta_limit. Achieving this is slightly
	* more complicated than it appears because it is common for data buffers
	* to have holds on meta data buffers. In addition, dnode meta data buffers
	* will be held by the dnodes in the block preventing them from being freed.
	* This means we can't simply traverse the ARC and expect to always find
	* enough unheld meta data buffer to release.
	*
	* Therefore, this function has been updated to make alternating passes
	* over the ARC releasing data buffers and then newly unheld meta data
	* buffers. This ensures forward progress is maintained and meta_used
	* will decrease. Normally this is sufficient, but if required the ARC
	* will call the registered prune callbacks causing dentry and inodes to
	* be dropped from the VFS cache. This will make dnode meta data buffers
	* available for reclaim.
	*/
	static uint64_t
	arc_evict_meta_balanced(uint64_t meta_used)
	{
	int64_t delta, prune = 0, adjustmnt;
	uint64_t total_evicted = 0;
	arc_buf_contents_t type = ARC_BUFC_DATA;
	int restarts = MAX(zfs_arc_meta_adjust_restarts, 0);

	restart:
	/*
	* This slightly differs than the way we evict from the mru in
	* arc_evict because we don't have a "target" value (i.e. no
	* "meta" arc_p). As a result, I think we can completely
	* cannibalize the metadata in the MRU before we evict the
	* metadata from the MFU. I think we probably need to implement a
	* "metadata arc_p" value to do this properly.
	*/
	adjustmnt = meta_used - arc_meta_limit;

	if (adjustmnt > 0 &&
	zfs_refcount_count(&arc_mru->arcs_esize[type]) > 0) {
	delta = MIN(zfs_refcount_count(&arc_mru->arcs_esize[type]),
	adjustmnt);
	total_evicted += arc_evict_impl(arc_mru, 0, delta, type);
	adjustmnt -= delta;
	}

	/*
	* We can't afford to recalculate adjustmnt here. If we do,
	* new metadata buffers can sneak into the MRU or ANON lists,
	* thus penalize the MFU metadata. Although the fudge factor is
	* small, it has been empirically shown to be significant for
	* certain workloads (e.g. creating many empty directories). As
	* such, we use the original calculation for adjustmnt, and
	* simply decrement the amount of data evicted from the MRU.
	*/

	if (adjustmnt > 0 &&
	zfs_refcount_count(&arc_mfu->arcs_esize[type]) > 0) {
	delta = MIN(zfs_refcount_count(&arc_mfu->arcs_esize[type]),
	adjustmnt);
	total_evicted += arc_evict_impl(arc_mfu, 0, delta, type);
	}

	adjustmnt = meta_used - arc_meta_limit;

	if (adjustmnt > 0 &&
	zfs_refcount_count(&arc_mru_ghost->arcs_esize[type]) > 0) {
	delta = MIN(adjustmnt,
	zfs_refcount_count(&arc_mru_ghost->arcs_esize[type]));
	total_evicted += arc_evict_impl(arc_mru_ghost, 0, delta, type);
	adjustmnt -= delta;
	}

	if (adjustmnt > 0 &&
	zfs_refcount_count(&arc_mfu_ghost->arcs_esize[type]) > 0) {
	delta = MIN(adjustmnt,
	zfs_refcount_count(&arc_mfu_ghost->arcs_esize[type]));
	total_evicted += arc_evict_impl(arc_mfu_ghost, 0, delta, type);
	}

	/*
	* If after attempting to make the requested adjustment to the ARC
	* the meta limit is still being exceeded then request that the
	* higher layers drop some cached objects which have holds on ARC
	* meta buffers. Requests to the upper layers will be made with
	* increasingly large scan sizes until the ARC is below the limit.
	*/
	if (meta_used > arc_meta_limit) {
	if (type == ARC_BUFC_DATA) {
	type = ARC_BUFC_METADATA;
	} else {
	type = ARC_BUFC_DATA;

	if (zfs_arc_meta_prune) {
	prune += zfs_arc_meta_prune;
	arc_prune_async(prune);
	}
	}

	if (restarts > 0) {
	restarts--;
	goto restart;
	}
	}
	return (total_evicted);
	}

	/*
	* Evict metadata buffers from the cache, such that arcstat_meta_used is
	* capped by the arc_meta_limit tunable.
	*/
	static uint64_t
	arc_evict_meta_only(uint64_t meta_used)
	{
	uint64_t total_evicted = 0;
	int64_t target;

	/*
	* If we're over the meta limit, we want to evict enough
	* metadata to get back under the meta limit. We don't want to
	* evict so much that we drop the MRU below arc_p, though. If
	* we're over the meta limit more than we're over arc_p, we
	* evict some from the MRU here, and some from the MFU below.
	*/
	target = MIN((int64_t)(meta_used - arc_meta_limit),
	(int64_t)(zfs_refcount_count(&arc_anon->arcs_size) +
	zfs_refcount_count(&arc_mru->arcs_size) - arc_p));

	total_evicted += arc_evict_impl(arc_mru, 0, target, ARC_BUFC_METADATA);

	/*
	* Similar to the above, we want to evict enough bytes to get us
	* below the meta limit, but not so much as to drop us below the
	* space allotted to the MFU (which is defined as arc_c - arc_p).
	*/
	target = MIN((int64_t)(meta_used - arc_meta_limit),
	(int64_t)(zfs_refcount_count(&arc_mfu->arcs_size) -
	(arc_c - arc_p)));

	total_evicted += arc_evict_impl(arc_mfu, 0, target, ARC_BUFC_METADATA);

	return (total_evicted);
	}

	static uint64_t
	arc_evict_meta(uint64_t meta_used)
	{
	if (zfs_arc_meta_strategy == ARC_STRATEGY_META_ONLY)
	return (arc_evict_meta_only(meta_used));
	else
	return (arc_evict_meta_balanced(meta_used));
	}

	/*
	* Return the type of the oldest buffer in the given arc state
	*
	* This function will select a random sublist of type ARC_BUFC_DATA and
	* a random sublist of type ARC_BUFC_METADATA. The tail of each sublist
	* is compared, and the type which contains the "older" buffer will be
	* returned.
	*/
	static arc_buf_contents_t
	arc_evict_type(arc_state_t *state)
	{
	multilist_t *data_ml = &state->arcs_list[ARC_BUFC_DATA];
	multilist_t *meta_ml = &state->arcs_list[ARC_BUFC_METADATA];
	int data_idx = multilist_get_random_index(data_ml);
	int meta_idx = multilist_get_random_index(meta_ml);
	multilist_sublist_t *data_mls;
	multilist_sublist_t *meta_mls;
	arc_buf_contents_t type;
	arc_buf_hdr_t *data_hdr;
	arc_buf_hdr_t *meta_hdr;

	/*
	* We keep the sublist lock until we're finished, to prevent
	* the headers from being destroyed via arc_evict_state().
	*/
	data_mls = multilist_sublist_lock(data_ml, data_idx);
	meta_mls = multilist_sublist_lock(meta_ml, meta_idx);

	/*
	* These two loops are to ensure we skip any markers that
	* might be at the tail of the lists due to arc_evict_state().
	*/

	for (data_hdr = multilist_sublist_tail(data_mls); data_hdr != NULL;
	data_hdr = multilist_sublist_prev(data_mls, data_hdr)) {
	if (data_hdr->b_spa != 0)
	break;
	}

	for (meta_hdr = multilist_sublist_tail(meta_mls); meta_hdr != NULL;
	meta_hdr = multilist_sublist_prev(meta_mls, meta_hdr)) {
	if (meta_hdr->b_spa != 0)
	break;
	}

	if (data_hdr == NULL && meta_hdr == NULL) {
	type = ARC_BUFC_DATA;
	} else if (data_hdr == NULL) {
	ASSERT3P(meta_hdr, !=, NULL);
	type = ARC_BUFC_METADATA;
	} else if (meta_hdr == NULL) {
	ASSERT3P(data_hdr, !=, NULL);
	type = ARC_BUFC_DATA;
	} else {
	ASSERT3P(data_hdr, !=, NULL);
	ASSERT3P(meta_hdr, !=, NULL);

	/* The headers can't be on the sublist without an L1 header */
	ASSERT(HDR_HAS_L1HDR(data_hdr));
	ASSERT(HDR_HAS_L1HDR(meta_hdr));

	if (data_hdr->b_l1hdr.b_arc_access <
	meta_hdr->b_l1hdr.b_arc_access) {
	type = ARC_BUFC_DATA;
	} else {
	type = ARC_BUFC_METADATA;
	}
	}

	multilist_sublist_unlock(meta_mls);
	multilist_sublist_unlock(data_mls);

	return (type);
	}

	/*
	* Evict buffers from the cache, such that arcstat_size is capped by arc_c.
	*/
	static uint64_t
	arc_evict(void)
	{
	uint64_t total_evicted = 0;
	uint64_t bytes;
	int64_t target;
	uint64_t asize = aggsum_value(&arc_sums.arcstat_size);
	uint64_t ameta = aggsum_value(&arc_sums.arcstat_meta_used);

	/*
	* If we're over arc_meta_limit, we want to correct that before
	* potentially evicting data buffers below.
	*/
	total_evicted += arc_evict_meta(ameta);

	/*
	* Adjust MRU size
	*
	* If we're over the target cache size, we want to evict enough
	* from the list to get back to our target size. We don't want
	* to evict too much from the MRU, such that it drops below
	* arc_p. So, if we're over our target cache size more than
	* the MRU is over arc_p, we'll evict enough to get back to
	* arc_p here, and then evict more from the MFU below.
	*/
	target = MIN((int64_t)(asize - arc_c),
	(int64_t)(zfs_refcount_count(&arc_anon->arcs_size) +
	zfs_refcount_count(&arc_mru->arcs_size) + ameta - arc_p));

	/*
	* If we're below arc_meta_min, always prefer to evict data.
	* Otherwise, try to satisfy the requested number of bytes to
	* evict from the type which contains older buffers; in an
	* effort to keep newer buffers in the cache regardless of their
	* type. If we cannot satisfy the number of bytes from this
	* type, spill over into the next type.
	*/
	if (arc_evict_type(arc_mru) == ARC_BUFC_METADATA &&
	ameta > arc_meta_min) {
	bytes = arc_evict_impl(arc_mru, 0, target, ARC_BUFC_METADATA);
	total_evicted += bytes;

	/*
	* If we couldn't evict our target number of bytes from
	* metadata, we try to get the rest from data.
	*/
	target -= bytes;

	total_evicted +=
	arc_evict_impl(arc_mru, 0, target, ARC_BUFC_DATA);
	} else {
	bytes = arc_evict_impl(arc_mru, 0, target, ARC_BUFC_DATA);
	total_evicted += bytes;

	/*
	* If we couldn't evict our target number of bytes from
	* data, we try to get the rest from metadata.
	*/
	target -= bytes;

	total_evicted +=
	arc_evict_impl(arc_mru, 0, target, ARC_BUFC_METADATA);
	}

	/*
	* Re-sum ARC stats after the first round of evictions.
	*/
	asize = aggsum_value(&arc_sums.arcstat_size);
	ameta = aggsum_value(&arc_sums.arcstat_meta_used);


	/*
	* Adjust MFU size
	*
	* Now that we've tried to evict enough from the MRU to get its
	* size back to arc_p, if we're still above the target cache
	* size, we evict the rest from the MFU.
	*/
	target = asize - arc_c;

	if (arc_evict_type(arc_mfu) == ARC_BUFC_METADATA &&
	ameta > arc_meta_min) {
	bytes = arc_evict_impl(arc_mfu, 0, target, ARC_BUFC_METADATA);
	total_evicted += bytes;

	/*
	* If we couldn't evict our target number of bytes from
	* metadata, we try to get the rest from data.
	*/
	target -= bytes;

	total_evicted +=
	arc_evict_impl(arc_mfu, 0, target, ARC_BUFC_DATA);
	} else {
	bytes = arc_evict_impl(arc_mfu, 0, target, ARC_BUFC_DATA);
	total_evicted += bytes;

	/*
	* If we couldn't evict our target number of bytes from
	* data, we try to get the rest from data.
	*/
	target -= bytes;

	total_evicted +=
	arc_evict_impl(arc_mfu, 0, target, ARC_BUFC_METADATA);
	}

	/*
	* Adjust ghost lists
	*
	* In addition to the above, the ARC also defines target values
	* for the ghost lists. The sum of the mru list and mru ghost
	* list should never exceed the target size of the cache, and
	* the sum of the mru list, mfu list, mru ghost list, and mfu
	* ghost list should never exceed twice the target size of the
	* cache. The following logic enforces these limits on the ghost
	* caches, and evicts from them as needed.
	*/
	target = zfs_refcount_count(&arc_mru->arcs_size) +
	zfs_refcount_count(&arc_mru_ghost->arcs_size) - arc_c;

	bytes = arc_evict_impl(arc_mru_ghost, 0, target, ARC_BUFC_DATA);
	total_evicted += bytes;

	target -= bytes;

	total_evicted +=
	arc_evict_impl(arc_mru_ghost, 0, target, ARC_BUFC_METADATA);

	/*
	* We assume the sum of the mru list and mfu list is less than
	* or equal to arc_c (we enforced this above), which means we
	* can use the simpler of the two equations below:
	*
	* mru + mfu + mru ghost + mfu ghost <= 2 * arc_c
	* mru ghost + mfu ghost <= arc_c
	*/
	target = zfs_refcount_count(&arc_mru_ghost->arcs_size) +
	zfs_refcount_count(&arc_mfu_ghost->arcs_size) - arc_c;

	bytes = arc_evict_impl(arc_mfu_ghost, 0, target, ARC_BUFC_DATA);
	total_evicted += bytes;

	target -= bytes;

	total_evicted +=
	arc_evict_impl(arc_mfu_ghost, 0, target, ARC_BUFC_METADATA);

	return (total_evicted);
	}

	void
	arc_flush(spa_t *spa, boolean_t retry)
	{
	uint64_t guid = 0;

	/*
	* If retry is B_TRUE, a spa must not be specified since we have
	* no good way to determine if all of a spa's buffers have been
	* evicted from an arc state.
	*/
	ASSERT(!retry \|\| spa == 0);

	if (spa != NULL)
	guid = spa_load_guid(spa);

	(void) arc_flush_state(arc_mru, guid, ARC_BUFC_DATA, retry);
	(void) arc_flush_state(arc_mru, guid, ARC_BUFC_METADATA, retry);

	(void) arc_flush_state(arc_mfu, guid, ARC_BUFC_DATA, retry);
	(void) arc_flush_state(arc_mfu, guid, ARC_BUFC_METADATA, retry);

	(void) arc_flush_state(arc_mru_ghost, guid, ARC_BUFC_DATA, retry);
	(void) arc_flush_state(arc_mru_ghost, guid, ARC_BUFC_METADATA, retry);

	(void) arc_flush_state(arc_mfu_ghost, guid, ARC_BUFC_DATA, retry);
	(void) arc_flush_state(arc_mfu_ghost, guid, ARC_BUFC_METADATA, retry);
	}

	void
	arc_reduce_target_size(int64_t to_free)
	{
	uint64_t asize = aggsum_value(&arc_sums.arcstat_size);

	/*
	* All callers want the ARC to actually evict (at least) this much
	* memory. Therefore we reduce from the lower of the current size and
	* the target size. This way, even if arc_c is much higher than
	* arc_size (as can be the case after many calls to arc_freed(), we will
	* immediately have arc_c < arc_size and therefore the arc_evict_zthr
	* will evict.
	*/
	uint64_t c = MIN(arc_c, asize);

	if (c > to_free && c - to_free > arc_c_min) {
	arc_c = c - to_free;
	atomic_add_64(&arc_p, -(arc_p >> arc_shrink_shift));
	if (arc_p > arc_c)
	arc_p = (arc_c >> 1);
	ASSERT(arc_c >= arc_c_min);
	ASSERT((int64_t)arc_p >= 0);
	} else {
	arc_c = arc_c_min;
	}

	if (asize > arc_c) {
	/* See comment in arc_evict_cb_check() on why lock+flag */
	mutex_enter(&arc_evict_lock);
	arc_evict_needed = B_TRUE;
	mutex_exit(&arc_evict_lock);
	zthr_wakeup(arc_evict_zthr);
	}
	}

	/*
	* Determine if the system is under memory pressure and is asking
	* to reclaim memory. A return value of B_TRUE indicates that the system
	* is under memory pressure and that the arc should adjust accordingly.
	*/
	boolean_t
	arc_reclaim_needed(void)
	{
	return (arc_available_memory() < 0);
	}

	void
	arc_kmem_reap_soon(void)
	{
	size_t i;
	kmem_cache_t *prev_cache = NULL;
	kmem_cache_t *prev_data_cache = NULL;
	extern kmem_cache_t *zio_buf_cache[];
	extern kmem_cache_t *zio_data_buf_cache[];

	#ifdef _KERNEL
	if ((aggsum_compare(&arc_sums.arcstat_meta_used,
	arc_meta_limit) >= 0) && zfs_arc_meta_prune) {
	/*
	* We are exceeding our meta-data cache limit.
	* Prune some entries to release holds on meta-data.
	*/
	arc_prune_async(zfs_arc_meta_prune);
	}
	#if defined(_ILP32)
	/*
	* Reclaim unused memory from all kmem caches.
	*/
	kmem_reap();
	#endif
	#endif

	for (i = 0; i < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; i++) {
	#if defined(_ILP32)
	/* reach upper limit of cache size on 32-bit */
	if (zio_buf_cache[i] == NULL)
	break;
	#endif
	if (zio_buf_cache[i] != prev_cache) {
	prev_cache = zio_buf_cache[i];
	kmem_cache_reap_now(zio_buf_cache[i]);
	}
	if (zio_data_buf_cache[i] != prev_data_cache) {
	prev_data_cache = zio_data_buf_cache[i];
	kmem_cache_reap_now(zio_data_buf_cache[i]);
	}
	}
	kmem_cache_reap_now(buf_cache);
	kmem_cache_reap_now(hdr_full_cache);
	kmem_cache_reap_now(hdr_l2only_cache);
	kmem_cache_reap_now(zfs_btree_leaf_cache);
	abd_cache_reap_now();
	}

	/* ARGSUSED */
	static boolean_t
	arc_evict_cb_check(void arg, zthr_t zthr)
	{
	#ifdef ZFS_DEBUG
	/*
	* This is necessary in order to keep the kstat information
	* up to date for tools that display kstat data such as the
	* mdb ::arc dcmd and the Linux crash utility. These tools
	* typically do not call kstat's update function, but simply
	* dump out stats from the most recent update. Without
	* this call, these commands may show stale stats for the
	* anon, mru, mru_ghost, mfu, and mfu_ghost lists. Even
	* with this call, the data might be out of date if the
	* evict thread hasn't been woken recently; but that should
	* suffice. The arc_state_t structures can be queried
	* directly if more accurate information is needed.
	*/
	if (arc_ksp != NULL)
	arc_ksp->ks_update(arc_ksp, KSTAT_READ);
	#endif

	/*
	* We have to rely on arc_wait_for_eviction() to tell us when to
	* evict, rather than checking if we are overflowing here, so that we
	* are sure to not leave arc_wait_for_eviction() waiting on aew_cv.
	* If we have become "not overflowing" since arc_wait_for_eviction()
	* checked, we need to wake it up. We could broadcast the CV here,
	* but arc_wait_for_eviction() may have not yet gone to sleep. We
	* would need to use a mutex to ensure that this function doesn't
	* broadcast until arc_wait_for_eviction() has gone to sleep (e.g.
	* the arc_evict_lock). However, the lock ordering of such a lock
	* would necessarily be incorrect with respect to the zthr_lock,
	* which is held before this function is called, and is held by
	* arc_wait_for_eviction() when it calls zthr_wakeup().
	*/
	return (arc_evict_needed);
	}

	/*
	* Keep arc_size under arc_c by running arc_evict which evicts data
	* from the ARC.
	*/
	/* ARGSUSED */
	static void
	arc_evict_cb(void arg, zthr_t zthr)
	{
	uint64_t evicted = 0;
	fstrans_cookie_t cookie = spl_fstrans_mark();

	/* Evict from cache */
	evicted = arc_evict();

	/*
	* If evicted is zero, we couldn't evict anything
	* via arc_evict(). This could be due to hash lock
	* collisions, but more likely due to the majority of
	* arc buffers being unevictable. Therefore, even if
	* arc_size is above arc_c, another pass is unlikely to
	* be helpful and could potentially cause us to enter an
	* infinite loop. Additionally, zthr_iscancelled() is
	* checked here so that if the arc is shutting down, the
	* broadcast will wake any remaining arc evict waiters.
	*/
	mutex_enter(&arc_evict_lock);
	arc_evict_needed = !zthr_iscancelled(arc_evict_zthr) &&
	evicted > 0 && aggsum_compare(&arc_sums.arcstat_size, arc_c) > 0;
	if (!arc_evict_needed) {
	/*
	* We're either no longer overflowing, or we
	* can't evict anything more, so we should wake
	* arc_get_data_impl() sooner.
	*/
	arc_evict_waiter_t *aw;
	while ((aw = list_remove_head(&arc_evict_waiters)) != NULL) {
	cv_broadcast(&aw->aew_cv);
	}
	arc_set_need_free();
	}
	mutex_exit(&arc_evict_lock);
	spl_fstrans_unmark(cookie);
	}

	/* ARGSUSED */
	static boolean_t
	arc_reap_cb_check(void arg, zthr_t zthr)
	{
	int64_t free_memory = arc_available_memory();
	static int reap_cb_check_counter = 0;

	/*
	* If a kmem reap is already active, don't schedule more. We must
	* check for this because kmem_cache_reap_soon() won't actually
	* block on the cache being reaped (this is to prevent callers from
	* becoming implicitly blocked by a system-wide kmem reap -- which,
	* on a system with many, many full magazines, can take minutes).
	*/
	if (!kmem_cache_reap_active() && free_memory < 0) {

	arc_no_grow = B_TRUE;
	arc_warm = B_TRUE;
	/*
	* Wait at least zfs_grow_retry (default 5) seconds
	* before considering growing.
	*/
	arc_growtime = gethrtime() + SEC2NSEC(arc_grow_retry);
	return (B_TRUE);
	} else if (free_memory < arc_c >> arc_no_grow_shift) {
	arc_no_grow = B_TRUE;
	} else if (gethrtime() >= arc_growtime) {
	arc_no_grow = B_FALSE;
	}

	/*
	* Called unconditionally every 60 seconds to reclaim unused
	* zstd compression and decompression context. This is done
	* here to avoid the need for an independent thread.
	*/
	if (!((reap_cb_check_counter++) % 60))
	zfs_zstd_cache_reap_now();

	return (B_FALSE);
	}

	/*
	* Keep enough free memory in the system by reaping the ARC's kmem
	* caches. To cause more slabs to be reapable, we may reduce the
	* target size of the cache (arc_c), causing the arc_evict_cb()
	* to free more buffers.
	*/
	/* ARGSUSED */
	static void
	arc_reap_cb(void arg, zthr_t zthr)
	{
	int64_t free_memory;
	fstrans_cookie_t cookie = spl_fstrans_mark();

	/*
	* Kick off asynchronous kmem_reap()'s of all our caches.
	*/
	arc_kmem_reap_soon();

	/*
	* Wait at least arc_kmem_cache_reap_retry_ms between
	* arc_kmem_reap_soon() calls. Without this check it is possible to
	* end up in a situation where we spend lots of time reaping
	* caches, while we're near arc_c_min. Waiting here also gives the
	* subsequent free memory check a chance of finding that the
	* asynchronous reap has already freed enough memory, and we don't
	* need to call arc_reduce_target_size().
	*/
	delay((hz * arc_kmem_cache_reap_retry_ms + 999) / 1000);

	/*
	* Reduce the target size as needed to maintain the amount of free
	* memory in the system at a fraction of the arc_size (1/128th by
	* default). If oversubscribed (free_memory < 0) then reduce the
	* target arc_size by the deficit amount plus the fractional
	* amount. If free memory is positive but less than the fractional
	* amount, reduce by what is needed to hit the fractional amount.
	*/
	free_memory = arc_available_memory();

	int64_t to_free =
	(arc_c >> arc_shrink_shift) - free_memory;
	if (to_free > 0) {
	arc_reduce_target_size(to_free);
	}
	spl_fstrans_unmark(cookie);
	}

	#ifdef _KERNEL
	/*
	* Determine the amount of memory eligible for eviction contained in the
	* ARC. All clean data reported by the ghost lists can always be safely
	* evicted. Due to arc_c_min, the same does not hold for all clean data
	* contained by the regular mru and mfu lists.
	*
	* In the case of the regular mru and mfu lists, we need to report as
	* much clean data as possible, such that evicting that same reported
	* data will not bring arc_size below arc_c_min. Thus, in certain
	* circumstances, the total amount of clean data in the mru and mfu
	* lists might not actually be evictable.
	*
	* The following two distinct cases are accounted for:
	*
	* 1. The sum of the amount of dirty data contained by both the mru and
	* mfu lists, plus the ARC's other accounting (e.g. the anon list),
	* is greater than or equal to arc_c_min.
	* (i.e. amount of dirty data >= arc_c_min)
	*
	* This is the easy case; all clean data contained by the mru and mfu
	* lists is evictable. Evicting all clean data can only drop arc_size
	* to the amount of dirty data, which is greater than arc_c_min.
	*
	* 2. The sum of the amount of dirty data contained by both the mru and
	* mfu lists, plus the ARC's other accounting (e.g. the anon list),
	* is less than arc_c_min.
	* (i.e. arc_c_min > amount of dirty data)
	*
	* 2.1. arc_size is greater than or equal arc_c_min.
	* (i.e. arc_size >= arc_c_min > amount of dirty data)
	*
	* In this case, not all clean data from the regular mru and mfu
	* lists is actually evictable; we must leave enough clean data
	* to keep arc_size above arc_c_min. Thus, the maximum amount of
	* evictable data from the two lists combined, is exactly the
	* difference between arc_size and arc_c_min.
	*
	* 2.2. arc_size is less than arc_c_min
	* (i.e. arc_c_min > arc_size > amount of dirty data)
	*
	* In this case, none of the data contained in the mru and mfu
	* lists is evictable, even if it's clean. Since arc_size is
	* already below arc_c_min, evicting any more would only
	* increase this negative difference.
	*/

	#endif /* _KERNEL */

	/*
	* Adapt arc info given the number of bytes we are trying to add and
	* the state that we are coming from. This function is only called
	* when we are adding new content to the cache.
	*/
	static void
	arc_adapt(int bytes, arc_state_t *state)
	{
	int mult;
	uint64_t arc_p_min = (arc_c >> arc_p_min_shift);
	int64_t mrug_size = zfs_refcount_count(&arc_mru_ghost->arcs_size);
	int64_t mfug_size = zfs_refcount_count(&arc_mfu_ghost->arcs_size);

	ASSERT(bytes > 0);
	/*
	* Adapt the target size of the MRU list:
	* - if we just hit in the MRU ghost list, then increase
	* the target size of the MRU list.
	* - if we just hit in the MFU ghost list, then increase
	* the target size of the MFU list by decreasing the
	* target size of the MRU list.
	*/
	if (state == arc_mru_ghost) {
	mult = (mrug_size >= mfug_size) ? 1 : (mfug_size / mrug_size);
	if (!zfs_arc_p_dampener_disable)
	mult = MIN(mult, 10); /* avoid wild arc_p adjustment */

	arc_p = MIN(arc_c - arc_p_min, arc_p + bytes * mult);
	} else if (state == arc_mfu_ghost) {
	uint64_t delta;

	mult = (mfug_size >= mrug_size) ? 1 : (mrug_size / mfug_size);
	if (!zfs_arc_p_dampener_disable)
	mult = MIN(mult, 10);

	delta = MIN(bytes * mult, arc_p);
	arc_p = MAX(arc_p_min, arc_p - delta);
	}
	ASSERT((int64_t)arc_p >= 0);

	/*
	* Wake reap thread if we do not have any available memory
	*/
	if (arc_reclaim_needed()) {
	zthr_wakeup(arc_reap_zthr);
	return;
	}

	if (arc_no_grow)
	return;

	if (arc_c >= arc_c_max)
	return;

	/*
	* If we're within (2 * maxblocksize) bytes of the target
	* cache size, increment the target cache size
	*/
	ASSERT3U(arc_c, >=, 2ULL << SPA_MAXBLOCKSHIFT);
	if (aggsum_upper_bound(&arc_sums.arcstat_size) >=
	arc_c - (2ULL << SPA_MAXBLOCKSHIFT)) {
	atomic_add_64(&arc_c, (int64_t)bytes);
	if (arc_c > arc_c_max)
	arc_c = arc_c_max;
	else if (state == arc_anon)
	atomic_add_64(&arc_p, (int64_t)bytes);
	if (arc_p > arc_c)
	arc_p = arc_c;
	}
	ASSERT((int64_t)arc_p >= 0);
	}

	/*
	* Check if arc_size has grown past our upper threshold, determined by
	* zfs_arc_overflow_shift.
	*/
	-boolean_t
	-arc_is_overflowing(void)
	+static arc_ovf_level_t
	+arc_is_overflowing(boolean_t use_reserve)
	{
	/* Always allow at least one block of overflow */
	int64_t overflow = MAX(SPA_MAXBLOCKSIZE,
	arc_c >> zfs_arc_overflow_shift);

	/*
	* We just compare the lower bound here for performance reasons. Our
	* primary goals are to make sure that the arc never grows without
	* bound, and that it can reach its maximum size. This check
	* accomplishes both goals. The maximum amount we could run over by is
	* 2 * aggsum_borrow_multiplier * NUM_CPUS * the average size of a block
	* in the ARC. In practice, that's in the tens of MB, which is low
	* enough to be safe.
	*/
	- return (aggsum_lower_bound(&arc_sums.arcstat_size) >=
	- (int64_t)arc_c + overflow);
	+ int64_t over = aggsum_lower_bound(&arc_sums.arcstat_size) -
	+ arc_c - overflow / 2;
	+ if (!use_reserve)
	+ overflow /= 2;
	+ return (over < 0 ? ARC_OVF_NONE :
	+ over < overflow ? ARC_OVF_SOME : ARC_OVF_SEVERE);
	}

	static abd_t *
	arc_get_data_abd(arc_buf_hdr_t hdr, uint64_t size, void tag,
	- boolean_t do_adapt)
	+ int alloc_flags)
	{
	arc_buf_contents_t type = arc_buf_type(hdr);

	- arc_get_data_impl(hdr, size, tag, do_adapt);
	+ arc_get_data_impl(hdr, size, tag, alloc_flags);
	if (type == ARC_BUFC_METADATA) {
	return (abd_alloc(size, B_TRUE));
	} else {
	ASSERT(type == ARC_BUFC_DATA);
	return (abd_alloc(size, B_FALSE));
	}
	}

	static void *
	arc_get_data_buf(arc_buf_hdr_t hdr, uint64_t size, void tag)
	{
	arc_buf_contents_t type = arc_buf_type(hdr);

	- arc_get_data_impl(hdr, size, tag, B_TRUE);
	+ arc_get_data_impl(hdr, size, tag, ARC_HDR_DO_ADAPT);
	if (type == ARC_BUFC_METADATA) {
	return (zio_buf_alloc(size));
	} else {
	ASSERT(type == ARC_BUFC_DATA);
	return (zio_data_buf_alloc(size));
	}
	}

	/*
	* Wait for the specified amount of data (in bytes) to be evicted from the
	* ARC, and for there to be sufficient free memory in the system. Waiting for
	* eviction ensures that the memory used by the ARC decreases. Waiting for
	* free memory ensures that the system won't run out of free pages, regardless
	* of ARC behavior and settings. See arc_lowmem_init().
	*/
	void
	-arc_wait_for_eviction(uint64_t amount)
	+arc_wait_for_eviction(uint64_t amount, boolean_t use_reserve)
	{
	- mutex_enter(&arc_evict_lock);
	- if (arc_is_overflowing()) {
	- arc_evict_needed = B_TRUE;
	- zthr_wakeup(arc_evict_zthr);
	-
	- if (amount != 0) {
	- arc_evict_waiter_t aw;
	- list_link_init(&aw.aew_node);
	- cv_init(&aw.aew_cv, NULL, CV_DEFAULT, NULL);
	+ switch (arc_is_overflowing(use_reserve)) {
	+ case ARC_OVF_NONE:
	+ return;
	+ case ARC_OVF_SOME:
	+ /*
	+ * This is a bit racy without taking arc_evict_lock, but the
	+ * worst that can happen is we either call zthr_wakeup() extra
	+ * time due to race with other thread here, or the set flag
	+ * get cleared by arc_evict_cb(), which is unlikely due to
	+ * big hysteresis, but also not important since at this level
	+ * of overflow the eviction is purely advisory. Same time
	+ * taking the global lock here every time without waiting for
	+ * the actual eviction creates a significant lock contention.
	+ */
	+ if (!arc_evict_needed) {
	+ arc_evict_needed = B_TRUE;
	+ zthr_wakeup(arc_evict_zthr);
	+ }
	+ return;
	+ case ARC_OVF_SEVERE:
	+ default:
	+ {
	+ arc_evict_waiter_t aw;
	+ list_link_init(&aw.aew_node);
	+ cv_init(&aw.aew_cv, NULL, CV_DEFAULT, NULL);

	- uint64_t last_count = 0;
	- if (!list_is_empty(&arc_evict_waiters)) {
	- arc_evict_waiter_t *last =
	- list_tail(&arc_evict_waiters);
	- last_count = last->aew_count;
	- }
	- /*
	- * Note, the last waiter's count may be less than
	- * arc_evict_count if we are low on memory in which
	- * case arc_evict_state_impl() may have deferred
	- * wakeups (but still incremented arc_evict_count).
	- */
	- aw.aew_count =
	- MAX(last_count, arc_evict_count) + amount;
	+ uint64_t last_count = 0;
	+ mutex_enter(&arc_evict_lock);
	+ if (!list_is_empty(&arc_evict_waiters)) {
	+ arc_evict_waiter_t *last =
	+ list_tail(&arc_evict_waiters);
	+ last_count = last->aew_count;
	+ } else if (!arc_evict_needed) {
	+ arc_evict_needed = B_TRUE;
	+ zthr_wakeup(arc_evict_zthr);
	+ }
	+ /*
	+ * Note, the last waiter's count may be less than
	+ * arc_evict_count if we are low on memory in which
	+ * case arc_evict_state_impl() may have deferred
	+ * wakeups (but still incremented arc_evict_count).
	+ */
	+ aw.aew_count = MAX(last_count, arc_evict_count) + amount;

	- list_insert_tail(&arc_evict_waiters, &aw);
	+ list_insert_tail(&arc_evict_waiters, &aw);

	- arc_set_need_free();
	+ arc_set_need_free();

	- DTRACE_PROBE3(arc__wait__for__eviction,
	- uint64_t, amount,
	- uint64_t, arc_evict_count,
	- uint64_t, aw.aew_count);
	+ DTRACE_PROBE3(arc__wait__for__eviction,
	+ uint64_t, amount,
	+ uint64_t, arc_evict_count,
	+ uint64_t, aw.aew_count);

	- /*
	- * We will be woken up either when arc_evict_count
	- * reaches aew_count, or when the ARC is no longer
	- * overflowing and eviction completes.
	- */
	+ /*
	+ * We will be woken up either when arc_evict_count reaches
	+ * aew_count, or when the ARC is no longer overflowing and
	+ * eviction completes.
	+ * In case of "false" wakeup, we will still be on the list.
	+ */
	+ do {
	cv_wait(&aw.aew_cv, &arc_evict_lock);
	+ } while (list_link_active(&aw.aew_node));
	+ mutex_exit(&arc_evict_lock);

	- /*
	- * In case of "false" wakeup, we will still be on the
	- * list.
	- */
	- if (list_link_active(&aw.aew_node))
	- list_remove(&arc_evict_waiters, &aw);
	-
	- cv_destroy(&aw.aew_cv);
	- }
	+ cv_destroy(&aw.aew_cv);
	+ }
	}
	- mutex_exit(&arc_evict_lock);
	}

	/*
	* Allocate a block and return it to the caller. If we are hitting the
	* hard limit for the cache size, we must sleep, waiting for the eviction
	* thread to catch up. If we're past the target size but below the hard
	* limit, we'll only signal the reclaim thread and continue on.
	*/
	static void
	arc_get_data_impl(arc_buf_hdr_t hdr, uint64_t size, void tag,
	- boolean_t do_adapt)
	+ int alloc_flags)
	{
	arc_state_t *state = hdr->b_l1hdr.b_state;
	arc_buf_contents_t type = arc_buf_type(hdr);

	- if (do_adapt)
	+ if (alloc_flags & ARC_HDR_DO_ADAPT)
	arc_adapt(size, state);

	/*
	* If arc_size is currently overflowing, we must be adding data
	* faster than we are evicting. To ensure we don't compound the
	* problem by adding more data and forcing arc_size to grow even
	* further past it's target size, we wait for the eviction thread to
	* make some progress. We also wait for there to be sufficient free
	* memory in the system, as measured by arc_free_memory().
	*
	* Specifically, we wait for zfs_arc_eviction_pct percent of the
	* requested size to be evicted. This should be more than 100%, to
	* ensure that that progress is also made towards getting arc_size
	* under arc_c. See the comment above zfs_arc_eviction_pct.
	- *
	- * We do the overflowing check without holding the arc_evict_lock to
	- * reduce lock contention in this hot path. Note that
	- * arc_wait_for_eviction() will acquire the lock and check again to
	- * ensure we are truly overflowing before blocking.
	*/
	- if (arc_is_overflowing()) {
	- arc_wait_for_eviction(size *
	- zfs_arc_eviction_pct / 100);
	- }
	+ arc_wait_for_eviction(size * zfs_arc_eviction_pct / 100,
	+ alloc_flags & ARC_HDR_USE_RESERVE);

	VERIFY3U(hdr->b_type, ==, type);
	if (type == ARC_BUFC_METADATA) {
	arc_space_consume(size, ARC_SPACE_META);
	} else {
	arc_space_consume(size, ARC_SPACE_DATA);
	}

	/*
	* Update the state size. Note that ghost states have a
	* "ghost size" and so don't need to be updated.
	*/
	if (!GHOST_STATE(state)) {

	(void) zfs_refcount_add_many(&state->arcs_size, size, tag);

	/*
	* If this is reached via arc_read, the link is
	* protected by the hash lock. If reached via
	* arc_buf_alloc, the header should not be accessed by
	* any other thread. And, if reached via arc_read_done,
	* the hash lock will protect it if it's found in the
	* hash table; otherwise no other thread should be
	* trying to [add\|remove]_reference it.
	*/
	if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
	(void) zfs_refcount_add_many(&state->arcs_esize[type],
	size, tag);
	}

	/*
	* If we are growing the cache, and we are adding anonymous
	* data, and we have outgrown arc_p, update arc_p
	*/
	if (aggsum_upper_bound(&arc_sums.arcstat_size) < arc_c &&
	hdr->b_l1hdr.b_state == arc_anon &&
	(zfs_refcount_count(&arc_anon->arcs_size) +
	zfs_refcount_count(&arc_mru->arcs_size) > arc_p))
	arc_p = MIN(arc_c, arc_p + size);
	}
	}

	static void
	arc_free_data_abd(arc_buf_hdr_t hdr, abd_t abd, uint64_t size, void *tag)
	{
	arc_free_data_impl(hdr, size, tag);
	abd_free(abd);
	}

	static void
	arc_free_data_buf(arc_buf_hdr_t hdr, void buf, uint64_t size, void *tag)
	{
	arc_buf_contents_t type = arc_buf_type(hdr);

	arc_free_data_impl(hdr, size, tag);
	if (type == ARC_BUFC_METADATA) {
	zio_buf_free(buf, size);
	} else {
	ASSERT(type == ARC_BUFC_DATA);
	zio_data_buf_free(buf, size);
	}
	}

	/*
	* Free the arc data buffer.
	*/
	static void
	arc_free_data_impl(arc_buf_hdr_t hdr, uint64_t size, void tag)
	{
	arc_state_t *state = hdr->b_l1hdr.b_state;
	arc_buf_contents_t type = arc_buf_type(hdr);

	/* protected by hash lock, if in the hash table */
	if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
	ASSERT(state != arc_anon && state != arc_l2c_only);

	(void) zfs_refcount_remove_many(&state->arcs_esize[type],
	size, tag);
	}
	(void) zfs_refcount_remove_many(&state->arcs_size, size, tag);

	VERIFY3U(hdr->b_type, ==, type);
	if (type == ARC_BUFC_METADATA) {
	arc_space_return(size, ARC_SPACE_META);
	} else {
	ASSERT(type == ARC_BUFC_DATA);
	arc_space_return(size, ARC_SPACE_DATA);
	}
	}

	/*
	* This routine is called whenever a buffer is accessed.
	* NOTE: the hash lock is dropped in this function.
	*/
	static void
	arc_access(arc_buf_hdr_t hdr, kmutex_t hash_lock)
	{
	clock_t now;

	ASSERT(MUTEX_HELD(hash_lock));
	ASSERT(HDR_HAS_L1HDR(hdr));

	if (hdr->b_l1hdr.b_state == arc_anon) {
	/*
	* This buffer is not in the cache, and does not
	* appear in our "ghost" list. Add the new buffer
	* to the MRU state.
	*/

	ASSERT0(hdr->b_l1hdr.b_arc_access);
	hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
	DTRACE_PROBE1(new_state__mru, arc_buf_hdr_t *, hdr);
	arc_change_state(arc_mru, hdr, hash_lock);

	} else if (hdr->b_l1hdr.b_state == arc_mru) {
	now = ddi_get_lbolt();

	/*
	* If this buffer is here because of a prefetch, then either:
	* - clear the flag if this is a "referencing" read
	* (any subsequent access will bump this into the MFU state).
	* or
	* - move the buffer to the head of the list if this is
	* another prefetch (to make it less likely to be evicted).
	*/
	if (HDR_PREFETCH(hdr) \|\| HDR_PRESCIENT_PREFETCH(hdr)) {
	if (zfs_refcount_count(&hdr->b_l1hdr.b_refcnt) == 0) {
	/* link protected by hash lock */
	ASSERT(multilist_link_active(
	&hdr->b_l1hdr.b_arc_node));
	} else {
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_decrement_state(hdr);
	arc_hdr_clear_flags(hdr,
	ARC_FLAG_PREFETCH \|
	ARC_FLAG_PRESCIENT_PREFETCH);
	- atomic_inc_32(&hdr->b_l1hdr.b_mru_hits);
	+ hdr->b_l1hdr.b_mru_hits++;
	ARCSTAT_BUMP(arcstat_mru_hits);
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_increment_state(hdr);
	}
	hdr->b_l1hdr.b_arc_access = now;
	return;
	}

	/*
	* This buffer has been "accessed" only once so far,
	* but it is still in the cache. Move it to the MFU
	* state.
	*/
	if (ddi_time_after(now, hdr->b_l1hdr.b_arc_access +
	ARC_MINTIME)) {
	/*
	* More than 125ms have passed since we
	* instantiated this buffer. Move it to the
	* most frequently used state.
	*/
	hdr->b_l1hdr.b_arc_access = now;
	DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, hdr);
	arc_change_state(arc_mfu, hdr, hash_lock);
	}
	- atomic_inc_32(&hdr->b_l1hdr.b_mru_hits);
	+ hdr->b_l1hdr.b_mru_hits++;
	ARCSTAT_BUMP(arcstat_mru_hits);
	} else if (hdr->b_l1hdr.b_state == arc_mru_ghost) {
	arc_state_t *new_state;
	/*
	* This buffer has been "accessed" recently, but
	* was evicted from the cache. Move it to the
	* MFU state.
	*/
	if (HDR_PREFETCH(hdr) \|\| HDR_PRESCIENT_PREFETCH(hdr)) {
	new_state = arc_mru;
	if (zfs_refcount_count(&hdr->b_l1hdr.b_refcnt) > 0) {
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_decrement_state(hdr);
	arc_hdr_clear_flags(hdr,
	ARC_FLAG_PREFETCH \|
	ARC_FLAG_PRESCIENT_PREFETCH);
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_increment_state(hdr);
	}
	DTRACE_PROBE1(new_state__mru, arc_buf_hdr_t *, hdr);
	} else {
	new_state = arc_mfu;
	DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, hdr);
	}

	hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
	arc_change_state(new_state, hdr, hash_lock);

	- atomic_inc_32(&hdr->b_l1hdr.b_mru_ghost_hits);
	+ hdr->b_l1hdr.b_mru_ghost_hits++;
	ARCSTAT_BUMP(arcstat_mru_ghost_hits);
	} else if (hdr->b_l1hdr.b_state == arc_mfu) {
	/*
	* This buffer has been accessed more than once and is
	* still in the cache. Keep it in the MFU state.
	*
	* NOTE: an add_reference() that occurred when we did
	* the arc_read() will have kicked this off the list.
	* If it was a prefetch, we will explicitly move it to
	* the head of the list now.
	*/

	- atomic_inc_32(&hdr->b_l1hdr.b_mfu_hits);
	+ hdr->b_l1hdr.b_mfu_hits++;
	ARCSTAT_BUMP(arcstat_mfu_hits);
	hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
	} else if (hdr->b_l1hdr.b_state == arc_mfu_ghost) {
	arc_state_t *new_state = arc_mfu;
	/*
	* This buffer has been accessed more than once but has
	* been evicted from the cache. Move it back to the
	* MFU state.
	*/

	if (HDR_PREFETCH(hdr) \|\| HDR_PRESCIENT_PREFETCH(hdr)) {
	/*
	* This is a prefetch access...
	* move this block back to the MRU state.
	*/
	new_state = arc_mru;
	}

	hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
	DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, hdr);
	arc_change_state(new_state, hdr, hash_lock);

	- atomic_inc_32(&hdr->b_l1hdr.b_mfu_ghost_hits);
	+ hdr->b_l1hdr.b_mfu_ghost_hits++;
	ARCSTAT_BUMP(arcstat_mfu_ghost_hits);
	} else if (hdr->b_l1hdr.b_state == arc_l2c_only) {
	/*
	* This buffer is on the 2nd Level ARC.
	*/

	hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
	DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, hdr);
	arc_change_state(arc_mfu, hdr, hash_lock);
	} else {
	cmn_err(CE_PANIC, "invalid arc state 0x%p",
	hdr->b_l1hdr.b_state);
	}
	}

	/*
	* This routine is called by dbuf_hold() to update the arc_access() state
	* which otherwise would be skipped for entries in the dbuf cache.
	*/
	void
	arc_buf_access(arc_buf_t *buf)
	{
	mutex_enter(&buf->b_evict_lock);
	arc_buf_hdr_t *hdr = buf->b_hdr;

	/*
	* Avoid taking the hash_lock when possible as an optimization.
	* The header must be checked again under the hash_lock in order
	* to handle the case where it is concurrently being released.
	*/
	if (hdr->b_l1hdr.b_state == arc_anon \|\| HDR_EMPTY(hdr)) {
	mutex_exit(&buf->b_evict_lock);
	return;
	}

	kmutex_t *hash_lock = HDR_LOCK(hdr);
	mutex_enter(hash_lock);

	if (hdr->b_l1hdr.b_state == arc_anon \|\| HDR_EMPTY(hdr)) {
	mutex_exit(hash_lock);
	mutex_exit(&buf->b_evict_lock);
	ARCSTAT_BUMP(arcstat_access_skip);
	return;
	}

	mutex_exit(&buf->b_evict_lock);

	ASSERT(hdr->b_l1hdr.b_state == arc_mru \|\|
	hdr->b_l1hdr.b_state == arc_mfu);

	DTRACE_PROBE1(arc__hit, arc_buf_hdr_t *, hdr);
	arc_access(hdr, hash_lock);
	mutex_exit(hash_lock);

	ARCSTAT_BUMP(arcstat_hits);
	ARCSTAT_CONDSTAT(!HDR_PREFETCH(hdr) && !HDR_PRESCIENT_PREFETCH(hdr),
	demand, prefetch, !HDR_ISTYPE_METADATA(hdr), data, metadata, hits);
	}

	/* a generic arc_read_done_func_t which you can use */
	/* ARGSUSED */
	void
	arc_bcopy_func(zio_t zio, const zbookmark_phys_t zb, const blkptr_t *bp,
	arc_buf_t buf, void arg)
	{
	if (buf == NULL)
	return;

	bcopy(buf->b_data, arg, arc_buf_size(buf));
	arc_buf_destroy(buf, arg);
	}

	/* a generic arc_read_done_func_t */
	/* ARGSUSED */
	void
	arc_getbuf_func(zio_t zio, const zbookmark_phys_t zb, const blkptr_t *bp,
	arc_buf_t buf, void arg)
	{
	arc_buf_t **bufp = arg;

	if (buf == NULL) {
	ASSERT(zio == NULL \|\| zio->io_error != 0);
	*bufp = NULL;
	} else {
	ASSERT(zio == NULL \|\| zio->io_error == 0);
	*bufp = buf;
	ASSERT(buf->b_data != NULL);
	}
	}

	static void
	arc_hdr_verify(arc_buf_hdr_t hdr, blkptr_t bp)
	{
	if (BP_IS_HOLE(bp) \|\| BP_IS_EMBEDDED(bp)) {
	ASSERT3U(HDR_GET_PSIZE(hdr), ==, 0);
	ASSERT3U(arc_hdr_get_compress(hdr), ==, ZIO_COMPRESS_OFF);
	} else {
	if (HDR_COMPRESSION_ENABLED(hdr)) {
	ASSERT3U(arc_hdr_get_compress(hdr), ==,
	BP_GET_COMPRESS(bp));
	}
	ASSERT3U(HDR_GET_LSIZE(hdr), ==, BP_GET_LSIZE(bp));
	ASSERT3U(HDR_GET_PSIZE(hdr), ==, BP_GET_PSIZE(bp));
	ASSERT3U(!!HDR_PROTECTED(hdr), ==, BP_IS_PROTECTED(bp));
	}
	}

	static void
	arc_read_done(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;
	arc_buf_hdr_t *hdr = zio->io_private;
	kmutex_t *hash_lock = NULL;
	arc_callback_t *callback_list;
	arc_callback_t *acb;
	boolean_t freeable = B_FALSE;

	/*
	* The hdr was inserted into hash-table and removed from lists
	* prior to starting I/O. We should find this header, since
	* it's in the hash table, and it should be legit since it's
	* not possible to evict it during the I/O. The only possible
	* reason for it not to be found is if we were freed during the
	* read.
	*/
	if (HDR_IN_HASH_TABLE(hdr)) {
	arc_buf_hdr_t *found;

	ASSERT3U(hdr->b_birth, ==, BP_PHYSICAL_BIRTH(zio->io_bp));
	ASSERT3U(hdr->b_dva.dva_word[0], ==,
	BP_IDENTITY(zio->io_bp)->dva_word[0]);
	ASSERT3U(hdr->b_dva.dva_word[1], ==,
	BP_IDENTITY(zio->io_bp)->dva_word[1]);

	found = buf_hash_find(hdr->b_spa, zio->io_bp, &hash_lock);

	ASSERT((found == hdr &&
	DVA_EQUAL(&hdr->b_dva, BP_IDENTITY(zio->io_bp))) \|\|
	(found == hdr && HDR_L2_READING(hdr)));
	ASSERT3P(hash_lock, !=, NULL);
	}

	if (BP_IS_PROTECTED(bp)) {
	hdr->b_crypt_hdr.b_ot = BP_GET_TYPE(bp);
	hdr->b_crypt_hdr.b_dsobj = zio->io_bookmark.zb_objset;
	zio_crypt_decode_params_bp(bp, hdr->b_crypt_hdr.b_salt,
	hdr->b_crypt_hdr.b_iv);

	if (BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) {
	void *tmpbuf;

	tmpbuf = abd_borrow_buf_copy(zio->io_abd,
	sizeof (zil_chain_t));
	zio_crypt_decode_mac_zil(tmpbuf,
	hdr->b_crypt_hdr.b_mac);
	abd_return_buf(zio->io_abd, tmpbuf,
	sizeof (zil_chain_t));
	} else {
	zio_crypt_decode_mac_bp(bp, hdr->b_crypt_hdr.b_mac);
	}
	}

	if (zio->io_error == 0) {
	/* byteswap if necessary */
	if (BP_SHOULD_BYTESWAP(zio->io_bp)) {
	if (BP_GET_LEVEL(zio->io_bp) > 0) {
	hdr->b_l1hdr.b_byteswap = DMU_BSWAP_UINT64;
	} else {
	hdr->b_l1hdr.b_byteswap =
	DMU_OT_BYTESWAP(BP_GET_TYPE(zio->io_bp));
	}
	} else {
	hdr->b_l1hdr.b_byteswap = DMU_BSWAP_NUMFUNCS;
	}
	if (!HDR_L2_READING(hdr)) {
	hdr->b_complevel = zio->io_prop.zp_complevel;
	}
	}

	arc_hdr_clear_flags(hdr, ARC_FLAG_L2_EVICTED);
	if (l2arc_noprefetch && HDR_PREFETCH(hdr))
	arc_hdr_clear_flags(hdr, ARC_FLAG_L2CACHE);

	callback_list = hdr->b_l1hdr.b_acb;
	ASSERT3P(callback_list, !=, NULL);

	if (hash_lock && zio->io_error == 0 &&
	hdr->b_l1hdr.b_state == arc_anon) {
	/*
	* Only call arc_access on anonymous buffers. This is because
	* if we've issued an I/O for an evicted buffer, we've already
	* called arc_access (to prevent any simultaneous readers from
	* getting confused).
	*/
	arc_access(hdr, hash_lock);
	}

	/*
	* If a read request has a callback (i.e. acb_done is not NULL), then we
	* make a buf containing the data according to the parameters which were
	* passed in. The implementation of arc_buf_alloc_impl() ensures that we
	* aren't needlessly decompressing the data multiple times.
	*/
	int callback_cnt = 0;
	for (acb = callback_list; acb != NULL; acb = acb->acb_next) {
	if (!acb->acb_done \|\| acb->acb_nobuf)
	continue;

	callback_cnt++;

	if (zio->io_error != 0)
	continue;

	int error = arc_buf_alloc_impl(hdr, zio->io_spa,
	&acb->acb_zb, acb->acb_private, acb->acb_encrypted,
	acb->acb_compressed, acb->acb_noauth, B_TRUE,
	&acb->acb_buf);

	/*
	* Assert non-speculative zios didn't fail because an
	* encryption key wasn't loaded
	*/
	ASSERT((zio->io_flags & ZIO_FLAG_SPECULATIVE) \|\|
	error != EACCES);

	/*
	* If we failed to decrypt, report an error now (as the zio
	* layer would have done if it had done the transforms).
	*/
	if (error == ECKSUM) {
	ASSERT(BP_IS_PROTECTED(bp));
	error = SET_ERROR(EIO);
	if ((zio->io_flags & ZIO_FLAG_SPECULATIVE) == 0) {
	spa_log_error(zio->io_spa, &acb->acb_zb);
	(void) zfs_ereport_post(
	FM_EREPORT_ZFS_AUTHENTICATION,
	zio->io_spa, NULL, &acb->acb_zb, zio, 0);
	}
	}

	if (error != 0) {
	/*
	* Decompression or decryption failed. Set
	* io_error so that when we call acb_done
	* (below), we will indicate that the read
	* failed. Note that in the unusual case
	* where one callback is compressed and another
	* uncompressed, we will mark all of them
	* as failed, even though the uncompressed
	* one can't actually fail. In this case,
	* the hdr will not be anonymous, because
	* if there are multiple callbacks, it's
	* because multiple threads found the same
	* arc buf in the hash table.
	*/
	zio->io_error = error;
	}
	}

	/*
	* If there are multiple callbacks, we must have the hash lock,
	* because the only way for multiple threads to find this hdr is
	* in the hash table. This ensures that if there are multiple
	* callbacks, the hdr is not anonymous. If it were anonymous,
	* we couldn't use arc_buf_destroy() in the error case below.
	*/
	ASSERT(callback_cnt < 2 \|\| hash_lock != NULL);

	hdr->b_l1hdr.b_acb = NULL;
	arc_hdr_clear_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
	if (callback_cnt == 0)
	ASSERT(hdr->b_l1hdr.b_pabd != NULL \|\| HDR_HAS_RABD(hdr));

	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt) \|\|
	callback_list != NULL);

	if (zio->io_error == 0) {
	arc_hdr_verify(hdr, zio->io_bp);
	} else {
	arc_hdr_set_flags(hdr, ARC_FLAG_IO_ERROR);
	if (hdr->b_l1hdr.b_state != arc_anon)
	arc_change_state(arc_anon, hdr, hash_lock);
	if (HDR_IN_HASH_TABLE(hdr))
	buf_hash_remove(hdr);
	freeable = zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt);
	}

	/*
	* Broadcast before we drop the hash_lock to avoid the possibility
	* that the hdr (and hence the cv) might be freed before we get to
	* the cv_broadcast().
	*/
	cv_broadcast(&hdr->b_l1hdr.b_cv);

	if (hash_lock != NULL) {
	mutex_exit(hash_lock);
	} else {
	/*
	* This block was freed while we waited for the read to
	* complete. It has been removed from the hash table and
	* moved to the anonymous state (so that it won't show up
	* in the cache).
	*/
	ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
	freeable = zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt);
	}

	/* execute each callback and free its structure */
	while ((acb = callback_list) != NULL) {
	if (acb->acb_done != NULL) {
	if (zio->io_error != 0 && acb->acb_buf != NULL) {
	/*
	* If arc_buf_alloc_impl() fails during
	* decompression, the buf will still be
	* allocated, and needs to be freed here.
	*/
	arc_buf_destroy(acb->acb_buf,
	acb->acb_private);
	acb->acb_buf = NULL;
	}
	acb->acb_done(zio, &zio->io_bookmark, zio->io_bp,
	acb->acb_buf, acb->acb_private);
	}

	if (acb->acb_zio_dummy != NULL) {
	acb->acb_zio_dummy->io_error = zio->io_error;
	zio_nowait(acb->acb_zio_dummy);
	}

	callback_list = acb->acb_next;
	kmem_free(acb, sizeof (arc_callback_t));
	}

	if (freeable)
	arc_hdr_destroy(hdr);
	}

	/*
	* "Read" the block at the specified DVA (in bp) via the
	* cache. If the block is found in the cache, invoke the provided
	* callback immediately and return. Note that the `zio' parameter
	* in the callback will be NULL in this case, since no IO was
	* required. If the block is not in the cache pass the read request
	* on to the spa with a substitute callback function, so that the
	* requested block will be added to the cache.
	*
	* If a read request arrives for a block that has a read in-progress,
	* either wait for the in-progress read to complete (and return the
	* results); or, if this is a read with a "done" func, add a record
	* to the read to invoke the "done" func when the read completes,
	* and return; or just return.
	*
	* arc_read_done() will invoke all the requested "done" functions
	* for readers of this block.
	*/
	int
	arc_read(zio_t pio, spa_t spa, const blkptr_t *bp,
	arc_read_done_func_t done, void private, zio_priority_t priority,
	int zio_flags, arc_flags_t arc_flags, const zbookmark_phys_t zb)
	{
	arc_buf_hdr_t *hdr = NULL;
	kmutex_t *hash_lock = NULL;
	zio_t *rzio;
	uint64_t guid = spa_load_guid(spa);
	boolean_t compressed_read = (zio_flags & ZIO_FLAG_RAW_COMPRESS) != 0;
	boolean_t encrypted_read = BP_IS_ENCRYPTED(bp) &&
	(zio_flags & ZIO_FLAG_RAW_ENCRYPT) != 0;
	boolean_t noauth_read = BP_IS_AUTHENTICATED(bp) &&
	(zio_flags & ZIO_FLAG_RAW_ENCRYPT) != 0;
	boolean_t embedded_bp = !!BP_IS_EMBEDDED(bp);
	boolean_t no_buf = *arc_flags & ARC_FLAG_NO_BUF;
	int rc = 0;

	ASSERT(!embedded_bp \|\|
	BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA);
	ASSERT(!BP_IS_HOLE(bp));
	ASSERT(!BP_IS_REDACTED(bp));

	/*
	* Normally SPL_FSTRANS will already be set since kernel threads which
	* expect to call the DMU interfaces will set it when created. System
	* calls are similarly handled by setting/cleaning the bit in the
	* registered callback (module/os/.../zfs/zpl_*).
	*
	* External consumers such as Lustre which call the exported DMU
	* interfaces may not have set SPL_FSTRANS. To avoid a deadlock
	* on the hash_lock always set and clear the bit.
	*/
	fstrans_cookie_t cookie = spl_fstrans_mark();
	top:
	+ /*
	+ * Verify the block pointer contents are reasonable. This should
	+ * always be the case since the blkptr is protected by a checksum.
	+ * However, if there is damage it's desirable to detect this early
	+ * and treat it as a checksum error. This allows an alternate blkptr
	+ * to be tried when one is available (e.g. ditto blocks).
	+ */
	+ if (!zfs_blkptr_verify(spa, bp, zio_flags & ZIO_FLAG_CONFIG_WRITER,
	+ BLK_VERIFY_LOG)) {
	+ rc = SET_ERROR(ECKSUM);
	+ goto out;
	+ }
	+
	if (!embedded_bp) {
	/*
	* Embedded BP's have no DVA and require no I/O to "read".
	* Create an anonymous arc buf to back it.
	*/
	- if (!zfs_blkptr_verify(spa, bp, zio_flags &
	- ZIO_FLAG_CONFIG_WRITER, BLK_VERIFY_LOG)) {
	- rc = SET_ERROR(ECKSUM);
	- goto out;
	- }
	-
	hdr = buf_hash_find(guid, bp, &hash_lock);
	}

	/*
	* Determine if we have an L1 cache hit or a cache miss. For simplicity
	* we maintain encrypted data separately from compressed / uncompressed
	* data. If the user is requesting raw encrypted data and we don't have
	* that in the header we will read from disk to guarantee that we can
	* get it even if the encryption keys aren't loaded.
	*/
	if (hdr != NULL && HDR_HAS_L1HDR(hdr) && (HDR_HAS_RABD(hdr) \|\|
	(hdr->b_l1hdr.b_pabd != NULL && !encrypted_read))) {
	arc_buf_t *buf = NULL;
	*arc_flags \|= ARC_FLAG_CACHED;

	if (HDR_IO_IN_PROGRESS(hdr)) {
	zio_t *head_zio = hdr->b_l1hdr.b_acb->acb_zio_head;

	if (*arc_flags & ARC_FLAG_CACHED_ONLY) {
	mutex_exit(hash_lock);
	ARCSTAT_BUMP(arcstat_cached_only_in_progress);
	rc = SET_ERROR(ENOENT);
	goto out;
	}

	ASSERT3P(head_zio, !=, NULL);
	if ((hdr->b_flags & ARC_FLAG_PRIO_ASYNC_READ) &&
	priority == ZIO_PRIORITY_SYNC_READ) {
	/*
	* This is a sync read that needs to wait for
	* an in-flight async read. Request that the
	* zio have its priority upgraded.
	*/
	zio_change_priority(head_zio, priority);
	DTRACE_PROBE1(arc__async__upgrade__sync,
	arc_buf_hdr_t *, hdr);
	ARCSTAT_BUMP(arcstat_async_upgrade_sync);
	}
	if (hdr->b_flags & ARC_FLAG_PREDICTIVE_PREFETCH) {
	arc_hdr_clear_flags(hdr,
	ARC_FLAG_PREDICTIVE_PREFETCH);
	}

	if (*arc_flags & ARC_FLAG_WAIT) {
	cv_wait(&hdr->b_l1hdr.b_cv, hash_lock);
	mutex_exit(hash_lock);
	goto top;
	}
	ASSERT(*arc_flags & ARC_FLAG_NOWAIT);

	if (done) {
	arc_callback_t *acb = NULL;

	acb = kmem_zalloc(sizeof (arc_callback_t),
	KM_SLEEP);
	acb->acb_done = done;
	acb->acb_private = private;
	acb->acb_compressed = compressed_read;
	acb->acb_encrypted = encrypted_read;
	acb->acb_noauth = noauth_read;
	acb->acb_nobuf = no_buf;
	acb->acb_zb = *zb;
	if (pio != NULL)
	acb->acb_zio_dummy = zio_null(pio,
	spa, NULL, NULL, NULL, zio_flags);

	ASSERT3P(acb->acb_done, !=, NULL);
	acb->acb_zio_head = head_zio;
	acb->acb_next = hdr->b_l1hdr.b_acb;
	hdr->b_l1hdr.b_acb = acb;
	}
	mutex_exit(hash_lock);
	goto out;
	}

	ASSERT(hdr->b_l1hdr.b_state == arc_mru \|\|
	hdr->b_l1hdr.b_state == arc_mfu);

	if (done && !no_buf) {
	if (hdr->b_flags & ARC_FLAG_PREDICTIVE_PREFETCH) {
	/*
	* This is a demand read which does not have to
	* wait for i/o because we did a predictive
	* prefetch i/o for it, which has completed.
	*/
	DTRACE_PROBE1(
	arc__demand__hit__predictive__prefetch,
	arc_buf_hdr_t *, hdr);
	ARCSTAT_BUMP(
	arcstat_demand_hit_predictive_prefetch);
	arc_hdr_clear_flags(hdr,
	ARC_FLAG_PREDICTIVE_PREFETCH);
	}

	if (hdr->b_flags & ARC_FLAG_PRESCIENT_PREFETCH) {
	ARCSTAT_BUMP(
	arcstat_demand_hit_prescient_prefetch);
	arc_hdr_clear_flags(hdr,
	ARC_FLAG_PRESCIENT_PREFETCH);
	}

	ASSERT(!embedded_bp \|\| !BP_IS_HOLE(bp));

	/* Get a buf with the desired data in it. */
	rc = arc_buf_alloc_impl(hdr, spa, zb, private,
	encrypted_read, compressed_read, noauth_read,
	B_TRUE, &buf);
	if (rc == ECKSUM) {
	/*
	* Convert authentication and decryption errors
	* to EIO (and generate an ereport if needed)
	* before leaving the ARC.
	*/
	rc = SET_ERROR(EIO);
	if ((zio_flags & ZIO_FLAG_SPECULATIVE) == 0) {
	spa_log_error(spa, zb);
	(void) zfs_ereport_post(
	FM_EREPORT_ZFS_AUTHENTICATION,
	spa, NULL, zb, NULL, 0);
	}
	}
	if (rc != 0) {
	(void) remove_reference(hdr, hash_lock,
	private);
	arc_buf_destroy_impl(buf);
	buf = NULL;
	}

	/* assert any errors weren't due to unloaded keys */
	ASSERT((zio_flags & ZIO_FLAG_SPECULATIVE) \|\|
	rc != EACCES);
	} else if (*arc_flags & ARC_FLAG_PREFETCH &&
	zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt)) {
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_decrement_state(hdr);
	arc_hdr_set_flags(hdr, ARC_FLAG_PREFETCH);
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_increment_state(hdr);
	}
	DTRACE_PROBE1(arc__hit, arc_buf_hdr_t *, hdr);
	arc_access(hdr, hash_lock);
	if (*arc_flags & ARC_FLAG_PRESCIENT_PREFETCH)
	arc_hdr_set_flags(hdr, ARC_FLAG_PRESCIENT_PREFETCH);
	if (*arc_flags & ARC_FLAG_L2CACHE)
	arc_hdr_set_flags(hdr, ARC_FLAG_L2CACHE);
	mutex_exit(hash_lock);
	ARCSTAT_BUMP(arcstat_hits);
	ARCSTAT_CONDSTAT(!HDR_PREFETCH(hdr),
	demand, prefetch, !HDR_ISTYPE_METADATA(hdr),
	data, metadata, hits);

	if (done)
	done(NULL, zb, bp, buf, private);
	} else {
	uint64_t lsize = BP_GET_LSIZE(bp);
	uint64_t psize = BP_GET_PSIZE(bp);
	arc_callback_t *acb;
	vdev_t *vd = NULL;
	uint64_t addr = 0;
	boolean_t devw = B_FALSE;
	uint64_t size;
	abd_t *hdr_abd;
	int alloc_flags = encrypted_read ? ARC_HDR_ALLOC_RDATA : 0;

	if (*arc_flags & ARC_FLAG_CACHED_ONLY) {
	rc = SET_ERROR(ENOENT);
	if (hash_lock != NULL)
	mutex_exit(hash_lock);
	goto out;
	}

	if (hdr == NULL) {
	/*
	* This block is not in the cache or it has
	* embedded data.
	*/
	arc_buf_hdr_t *exists = NULL;
	arc_buf_contents_t type = BP_GET_BUFC_TYPE(bp);
	hdr = arc_hdr_alloc(spa_load_guid(spa), psize, lsize,
	- BP_IS_PROTECTED(bp), BP_GET_COMPRESS(bp), 0, type,
	- encrypted_read);
	+ BP_IS_PROTECTED(bp), BP_GET_COMPRESS(bp), 0, type);

	if (!embedded_bp) {
	hdr->b_dva = *BP_IDENTITY(bp);
	hdr->b_birth = BP_PHYSICAL_BIRTH(bp);
	exists = buf_hash_insert(hdr, &hash_lock);
	}
	if (exists != NULL) {
	/* somebody beat us to the hash insert */
	mutex_exit(hash_lock);
	buf_discard_identity(hdr);
	arc_hdr_destroy(hdr);
	goto top; /* restart the IO request */
	}
	+ alloc_flags \|= ARC_HDR_DO_ADAPT;
	} else {
	/*
	* This block is in the ghost cache or encrypted data
	* was requested and we didn't have it. If it was
	* L2-only (and thus didn't have an L1 hdr),
	* we realloc the header to add an L1 hdr.
	*/
	if (!HDR_HAS_L1HDR(hdr)) {
	hdr = arc_hdr_realloc(hdr, hdr_l2only_cache,
	hdr_full_cache);
	}

	if (GHOST_STATE(hdr->b_l1hdr.b_state)) {
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!HDR_HAS_RABD(hdr));
	ASSERT(!HDR_IO_IN_PROGRESS(hdr));
	ASSERT0(zfs_refcount_count(
	&hdr->b_l1hdr.b_refcnt));
	ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
	ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);
	} else if (HDR_IO_IN_PROGRESS(hdr)) {
	/*
	* If this header already had an IO in progress
	* and we are performing another IO to fetch
	* encrypted data we must wait until the first
	* IO completes so as not to confuse
	* arc_read_done(). This should be very rare
	* and so the performance impact shouldn't
	* matter.
	*/
	cv_wait(&hdr->b_l1hdr.b_cv, hash_lock);
	mutex_exit(hash_lock);
	goto top;
	}

	/*
	* This is a delicate dance that we play here.
	* This hdr might be in the ghost list so we access
	* it to move it out of the ghost list before we
	* initiate the read. If it's a prefetch then
	* it won't have a callback so we'll remove the
	* reference that arc_buf_alloc_impl() created. We
	* do this after we've called arc_access() to
	* avoid hitting an assert in remove_reference().
	*/
	arc_adapt(arc_hdr_size(hdr), hdr->b_l1hdr.b_state);
	arc_access(hdr, hash_lock);
	- arc_hdr_alloc_abd(hdr, alloc_flags);
	}

	+ arc_hdr_alloc_abd(hdr, alloc_flags);
	if (encrypted_read) {
	ASSERT(HDR_HAS_RABD(hdr));
	size = HDR_GET_PSIZE(hdr);
	hdr_abd = hdr->b_crypt_hdr.b_rabd;
	zio_flags \|= ZIO_FLAG_RAW;
	} else {
	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
	size = arc_hdr_size(hdr);
	hdr_abd = hdr->b_l1hdr.b_pabd;

	if (arc_hdr_get_compress(hdr) != ZIO_COMPRESS_OFF) {
	zio_flags \|= ZIO_FLAG_RAW_COMPRESS;
	}

	/*
	* For authenticated bp's, we do not ask the ZIO layer
	* to authenticate them since this will cause the entire
	* IO to fail if the key isn't loaded. Instead, we
	* defer authentication until arc_buf_fill(), which will
	* verify the data when the key is available.
	*/
	if (BP_IS_AUTHENTICATED(bp))
	zio_flags \|= ZIO_FLAG_RAW_ENCRYPT;
	}

	if (*arc_flags & ARC_FLAG_PREFETCH &&
	zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt)) {
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_decrement_state(hdr);
	arc_hdr_set_flags(hdr, ARC_FLAG_PREFETCH);
	if (HDR_HAS_L2HDR(hdr))
	l2arc_hdr_arcstats_increment_state(hdr);
	}
	if (*arc_flags & ARC_FLAG_PRESCIENT_PREFETCH)
	arc_hdr_set_flags(hdr, ARC_FLAG_PRESCIENT_PREFETCH);
	if (*arc_flags & ARC_FLAG_L2CACHE)
	arc_hdr_set_flags(hdr, ARC_FLAG_L2CACHE);
	if (BP_IS_AUTHENTICATED(bp))
	arc_hdr_set_flags(hdr, ARC_FLAG_NOAUTH);
	if (BP_GET_LEVEL(bp) > 0)
	arc_hdr_set_flags(hdr, ARC_FLAG_INDIRECT);
	if (*arc_flags & ARC_FLAG_PREDICTIVE_PREFETCH)
	arc_hdr_set_flags(hdr, ARC_FLAG_PREDICTIVE_PREFETCH);
	ASSERT(!GHOST_STATE(hdr->b_l1hdr.b_state));

	acb = kmem_zalloc(sizeof (arc_callback_t), KM_SLEEP);
	acb->acb_done = done;
	acb->acb_private = private;
	acb->acb_compressed = compressed_read;
	acb->acb_encrypted = encrypted_read;
	acb->acb_noauth = noauth_read;
	acb->acb_zb = *zb;

	ASSERT3P(hdr->b_l1hdr.b_acb, ==, NULL);
	hdr->b_l1hdr.b_acb = acb;
	arc_hdr_set_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);

	if (HDR_HAS_L2HDR(hdr) &&
	(vd = hdr->b_l2hdr.b_dev->l2ad_vdev) != NULL) {
	devw = hdr->b_l2hdr.b_dev->l2ad_writing;
	addr = hdr->b_l2hdr.b_daddr;
	/*
	* Lock out L2ARC device removal.
	*/
	if (vdev_is_dead(vd) \|\|
	!spa_config_tryenter(spa, SCL_L2ARC, vd, RW_READER))
	vd = NULL;
	}

	/*
	* We count both async reads and scrub IOs as asynchronous so
	* that both can be upgraded in the event of a cache hit while
	* the read IO is still in-flight.
	*/
	if (priority == ZIO_PRIORITY_ASYNC_READ \|\|
	priority == ZIO_PRIORITY_SCRUB)
	arc_hdr_set_flags(hdr, ARC_FLAG_PRIO_ASYNC_READ);
	else
	arc_hdr_clear_flags(hdr, ARC_FLAG_PRIO_ASYNC_READ);

	/*
	* At this point, we have a level 1 cache miss or a blkptr
	* with embedded data. Try again in L2ARC if possible.
	*/
	ASSERT3U(HDR_GET_LSIZE(hdr), ==, lsize);

	/*
	* Skip ARC stat bump for block pointers with embedded
	* data. The data are read from the blkptr itself via
	* decode_embedded_bp_compressed().
	*/
	if (!embedded_bp) {
	DTRACE_PROBE4(arc__miss, arc_buf_hdr_t *, hdr,
	blkptr_t *, bp, uint64_t, lsize,
	zbookmark_phys_t *, zb);
	ARCSTAT_BUMP(arcstat_misses);
	ARCSTAT_CONDSTAT(!HDR_PREFETCH(hdr),
	demand, prefetch, !HDR_ISTYPE_METADATA(hdr), data,
	metadata, misses);
	zfs_racct_read(size, 1);
	}

	/* Check if the spa even has l2 configured */
	const boolean_t spa_has_l2 = l2arc_ndev != 0 &&
	spa->spa_l2cache.sav_count > 0;

	if (vd != NULL && spa_has_l2 && !(l2arc_norw && devw)) {
	/*
	* Read from the L2ARC if the following are true:
	* 1. The L2ARC vdev was previously cached.
	* 2. This buffer still has L2ARC metadata.
	* 3. This buffer isn't currently writing to the L2ARC.
	* 4. The L2ARC entry wasn't evicted, which may
	* also have invalidated the vdev.
	* 5. This isn't prefetch or l2arc_noprefetch is 0.
	*/
	if (HDR_HAS_L2HDR(hdr) &&
	!HDR_L2_WRITING(hdr) && !HDR_L2_EVICTED(hdr) &&
	!(l2arc_noprefetch && HDR_PREFETCH(hdr))) {
	l2arc_read_callback_t *cb;
	abd_t *abd;
	uint64_t asize;

	DTRACE_PROBE1(l2arc__hit, arc_buf_hdr_t *, hdr);
	ARCSTAT_BUMP(arcstat_l2_hits);
	- atomic_inc_32(&hdr->b_l2hdr.b_hits);
	+ hdr->b_l2hdr.b_hits++;

	cb = kmem_zalloc(sizeof (l2arc_read_callback_t),
	KM_SLEEP);
	cb->l2rcb_hdr = hdr;
	cb->l2rcb_bp = *bp;
	cb->l2rcb_zb = *zb;
	cb->l2rcb_flags = zio_flags;

	/*
	* When Compressed ARC is disabled, but the
	* L2ARC block is compressed, arc_hdr_size()
	* will have returned LSIZE rather than PSIZE.
	*/
	if (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF &&
	!HDR_COMPRESSION_ENABLED(hdr) &&
	HDR_GET_PSIZE(hdr) != 0) {
	size = HDR_GET_PSIZE(hdr);
	}

	asize = vdev_psize_to_asize(vd, size);
	if (asize != size) {
	abd = abd_alloc_for_io(asize,
	HDR_ISTYPE_METADATA(hdr));
	cb->l2rcb_abd = abd;
	} else {
	abd = hdr_abd;
	}

	ASSERT(addr >= VDEV_LABEL_START_SIZE &&
	addr + asize <= vd->vdev_psize -
	VDEV_LABEL_END_SIZE);

	/*
	* l2arc read. The SCL_L2ARC lock will be
	* released by l2arc_read_done().
	* Issue a null zio if the underlying buffer
	* was squashed to zero size by compression.
	*/
	ASSERT3U(arc_hdr_get_compress(hdr), !=,
	ZIO_COMPRESS_EMPTY);
	rzio = zio_read_phys(pio, vd, addr,
	asize, abd,
	ZIO_CHECKSUM_OFF,
	l2arc_read_done, cb, priority,
	zio_flags \| ZIO_FLAG_DONT_CACHE \|
	ZIO_FLAG_CANFAIL \|
	ZIO_FLAG_DONT_PROPAGATE \|
	ZIO_FLAG_DONT_RETRY, B_FALSE);
	acb->acb_zio_head = rzio;

	if (hash_lock != NULL)
	mutex_exit(hash_lock);

	DTRACE_PROBE2(l2arc__read, vdev_t *, vd,
	zio_t *, rzio);
	ARCSTAT_INCR(arcstat_l2_read_bytes,
	HDR_GET_PSIZE(hdr));

	if (*arc_flags & ARC_FLAG_NOWAIT) {
	zio_nowait(rzio);
	goto out;
	}

	ASSERT(*arc_flags & ARC_FLAG_WAIT);
	if (zio_wait(rzio) == 0)
	goto out;

	/* l2arc read error; goto zio_read() */
	if (hash_lock != NULL)
	mutex_enter(hash_lock);
	} else {
	DTRACE_PROBE1(l2arc__miss,
	arc_buf_hdr_t *, hdr);
	ARCSTAT_BUMP(arcstat_l2_misses);
	if (HDR_L2_WRITING(hdr))
	ARCSTAT_BUMP(arcstat_l2_rw_clash);
	spa_config_exit(spa, SCL_L2ARC, vd);
	}
	} else {
	if (vd != NULL)
	spa_config_exit(spa, SCL_L2ARC, vd);

	/*
	* Only a spa with l2 should contribute to l2
	* miss stats. (Including the case of having a
	* faulted cache device - that's also a miss.)
	*/
	if (spa_has_l2) {
	/*
	* Skip ARC stat bump for block pointers with
	* embedded data. The data are read from the
	* blkptr itself via
	* decode_embedded_bp_compressed().
	*/
	if (!embedded_bp) {
	DTRACE_PROBE1(l2arc__miss,
	arc_buf_hdr_t *, hdr);
	ARCSTAT_BUMP(arcstat_l2_misses);
	}
	}
	}

	rzio = zio_read(pio, spa, bp, hdr_abd, size,
	arc_read_done, hdr, priority, zio_flags, zb);
	acb->acb_zio_head = rzio;

	if (hash_lock != NULL)
	mutex_exit(hash_lock);

	if (*arc_flags & ARC_FLAG_WAIT) {
	rc = zio_wait(rzio);
	goto out;
	}

	ASSERT(*arc_flags & ARC_FLAG_NOWAIT);
	zio_nowait(rzio);
	}

	out:
	/* embedded bps don't actually go to disk */
	if (!embedded_bp)
	spa_read_history_add(spa, zb, *arc_flags);
	spl_fstrans_unmark(cookie);
	return (rc);
	}

	arc_prune_t *
	arc_add_prune_callback(arc_prune_func_t func, void private)
	{
	arc_prune_t *p;

	p = kmem_alloc(sizeof (*p), KM_SLEEP);
	p->p_pfunc = func;
	p->p_private = private;
	list_link_init(&p->p_node);
	zfs_refcount_create(&p->p_refcnt);

	mutex_enter(&arc_prune_mtx);
	zfs_refcount_add(&p->p_refcnt, &arc_prune_list);
	list_insert_head(&arc_prune_list, p);
	mutex_exit(&arc_prune_mtx);

	return (p);
	}

	void
	arc_remove_prune_callback(arc_prune_t *p)
	{
	boolean_t wait = B_FALSE;
	mutex_enter(&arc_prune_mtx);
	list_remove(&arc_prune_list, p);
	if (zfs_refcount_remove(&p->p_refcnt, &arc_prune_list) > 0)
	wait = B_TRUE;
	mutex_exit(&arc_prune_mtx);

	/* wait for arc_prune_task to finish */
	if (wait)
	taskq_wait_outstanding(arc_prune_taskq, 0);
	ASSERT0(zfs_refcount_count(&p->p_refcnt));
	zfs_refcount_destroy(&p->p_refcnt);
	kmem_free(p, sizeof (*p));
	}

	/*
	* Notify the arc that a block was freed, and thus will never be used again.
	*/
	void
	arc_freed(spa_t spa, const blkptr_t bp)
	{
	arc_buf_hdr_t *hdr;
	kmutex_t *hash_lock;
	uint64_t guid = spa_load_guid(spa);

	ASSERT(!BP_IS_EMBEDDED(bp));

	hdr = buf_hash_find(guid, bp, &hash_lock);
	if (hdr == NULL)
	return;

	/*
	* We might be trying to free a block that is still doing I/O
	* (i.e. prefetch) or has a reference (i.e. a dedup-ed,
	* dmu_sync-ed block). If this block is being prefetched, then it
	* would still have the ARC_FLAG_IO_IN_PROGRESS flag set on the hdr
	* until the I/O completes. A block may also have a reference if it is
	* part of a dedup-ed, dmu_synced write. The dmu_sync() function would
	* have written the new block to its final resting place on disk but
	* without the dedup flag set. This would have left the hdr in the MRU
	* state and discoverable. When the txg finally syncs it detects that
	* the block was overridden in open context and issues an override I/O.
	* Since this is a dedup block, the override I/O will determine if the
	* block is already in the DDT. If so, then it will replace the io_bp
	* with the bp from the DDT and allow the I/O to finish. When the I/O
	* reaches the done callback, dbuf_write_override_done, it will
	* check to see if the io_bp and io_bp_override are identical.
	* If they are not, then it indicates that the bp was replaced with
	* the bp in the DDT and the override bp is freed. This allows
	* us to arrive here with a reference on a block that is being
	* freed. So if we have an I/O in progress, or a reference to
	* this hdr, then we don't destroy the hdr.
	*/
	if (!HDR_HAS_L1HDR(hdr) \|\| (!HDR_IO_IN_PROGRESS(hdr) &&
	zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt))) {
	arc_change_state(arc_anon, hdr, hash_lock);
	arc_hdr_destroy(hdr);
	mutex_exit(hash_lock);
	} else {
	mutex_exit(hash_lock);
	}

	}

	/*
	* Release this buffer from the cache, making it an anonymous buffer. This
	* must be done after a read and prior to modifying the buffer contents.
	* If the buffer has more than one reference, we must make
	* a new hdr for the buffer.
	*/
	void
	arc_release(arc_buf_t buf, void tag)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;

	/*
	* It would be nice to assert that if its DMU metadata (level >
	* 0 \|\| it's the dnode file), then it must be syncing context.
	* But we don't know that information at this level.
	*/

	mutex_enter(&buf->b_evict_lock);

	ASSERT(HDR_HAS_L1HDR(hdr));

	/*
	* We don't grab the hash lock prior to this check, because if
	* the buffer's header is in the arc_anon state, it won't be
	* linked into the hash table.
	*/
	if (hdr->b_l1hdr.b_state == arc_anon) {
	mutex_exit(&buf->b_evict_lock);
	ASSERT(!HDR_IO_IN_PROGRESS(hdr));
	ASSERT(!HDR_IN_HASH_TABLE(hdr));
	ASSERT(!HDR_HAS_L2HDR(hdr));
	- ASSERT(HDR_EMPTY(hdr));

	ASSERT3U(hdr->b_l1hdr.b_bufcnt, ==, 1);
	ASSERT3S(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt), ==, 1);
	ASSERT(!list_link_active(&hdr->b_l1hdr.b_arc_node));

	hdr->b_l1hdr.b_arc_access = 0;

	/*
	* If the buf is being overridden then it may already
	* have a hdr that is not empty.
	*/
	buf_discard_identity(hdr);
	arc_buf_thaw(buf);

	return;
	}

	kmutex_t *hash_lock = HDR_LOCK(hdr);
	mutex_enter(hash_lock);

	/*
	* This assignment is only valid as long as the hash_lock is
	* held, we must be careful not to reference state or the
	* b_state field after dropping the lock.
	*/
	arc_state_t *state = hdr->b_l1hdr.b_state;
	ASSERT3P(hash_lock, ==, HDR_LOCK(hdr));
	ASSERT3P(state, !=, arc_anon);

	/* this buffer is not on any list */
	ASSERT3S(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt), >, 0);

	if (HDR_HAS_L2HDR(hdr)) {
	mutex_enter(&hdr->b_l2hdr.b_dev->l2ad_mtx);

	/*
	* We have to recheck this conditional again now that
	* we're holding the l2ad_mtx to prevent a race with
	* another thread which might be concurrently calling
	* l2arc_evict(). In that case, l2arc_evict() might have
	* destroyed the header's L2 portion as we were waiting
	* to acquire the l2ad_mtx.
	*/
	if (HDR_HAS_L2HDR(hdr))
	arc_hdr_l2hdr_destroy(hdr);

	mutex_exit(&hdr->b_l2hdr.b_dev->l2ad_mtx);
	}

	/*
	* Do we have more than one buf?
	*/
	if (hdr->b_l1hdr.b_bufcnt > 1) {
	arc_buf_hdr_t *nhdr;
	uint64_t spa = hdr->b_spa;
	uint64_t psize = HDR_GET_PSIZE(hdr);
	uint64_t lsize = HDR_GET_LSIZE(hdr);
	boolean_t protected = HDR_PROTECTED(hdr);
	enum zio_compress compress = arc_hdr_get_compress(hdr);
	arc_buf_contents_t type = arc_buf_type(hdr);
	VERIFY3U(hdr->b_type, ==, type);

	ASSERT(hdr->b_l1hdr.b_buf != buf \|\| buf->b_next != NULL);
	(void) remove_reference(hdr, hash_lock, tag);

	if (arc_buf_is_shared(buf) && !ARC_BUF_COMPRESSED(buf)) {
	ASSERT3P(hdr->b_l1hdr.b_buf, !=, buf);
	ASSERT(ARC_BUF_LAST(buf));
	}

	/*
	* Pull the data off of this hdr and attach it to
	* a new anonymous hdr. Also find the last buffer
	* in the hdr's buffer list.
	*/
	arc_buf_t *lastbuf = arc_buf_remove(hdr, buf);
	ASSERT3P(lastbuf, !=, NULL);

	/*
	* If the current arc_buf_t and the hdr are sharing their data
	* buffer, then we must stop sharing that block.
	*/
	if (arc_buf_is_shared(buf)) {
	ASSERT3P(hdr->b_l1hdr.b_buf, !=, buf);
	VERIFY(!arc_buf_is_shared(lastbuf));

	/*
	* First, sever the block sharing relationship between
	* buf and the arc_buf_hdr_t.
	*/
	arc_unshare_buf(hdr, buf);

	/*
	* Now we need to recreate the hdr's b_pabd. Since we
	* have lastbuf handy, we try to share with it, but if
	* we can't then we allocate a new b_pabd and copy the
	* data from buf into it.
	*/
	if (arc_can_share(hdr, lastbuf)) {
	arc_share_buf(hdr, lastbuf);
	} else {
	arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT);
	abd_copy_from_buf(hdr->b_l1hdr.b_pabd,
	buf->b_data, psize);
	}
	VERIFY3P(lastbuf->b_data, !=, NULL);
	} else if (HDR_SHARED_DATA(hdr)) {
	/*
	* Uncompressed shared buffers are always at the end
	* of the list. Compressed buffers don't have the
	* same requirements. This makes it hard to
	* simply assert that the lastbuf is shared so
	* we rely on the hdr's compression flags to determine
	* if we have a compressed, shared buffer.
	*/
	ASSERT(arc_buf_is_shared(lastbuf) \|\|
	arc_hdr_get_compress(hdr) != ZIO_COMPRESS_OFF);
	ASSERT(!ARC_BUF_SHARED(buf));
	}

	ASSERT(hdr->b_l1hdr.b_pabd != NULL \|\| HDR_HAS_RABD(hdr));
	ASSERT3P(state, !=, arc_l2c_only);

	(void) zfs_refcount_remove_many(&state->arcs_size,
	arc_buf_size(buf), buf);

	if (zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt)) {
	ASSERT3P(state, !=, arc_l2c_only);
	(void) zfs_refcount_remove_many(
	&state->arcs_esize[type],
	arc_buf_size(buf), buf);
	}

	hdr->b_l1hdr.b_bufcnt -= 1;
	if (ARC_BUF_ENCRYPTED(buf))
	hdr->b_crypt_hdr.b_ebufcnt -= 1;

	arc_cksum_verify(buf);
	arc_buf_unwatch(buf);

	/* if this is the last uncompressed buf free the checksum */
	if (!arc_hdr_has_uncompressed_buf(hdr))
	arc_cksum_free(hdr);

	mutex_exit(hash_lock);

	/*
	* Allocate a new hdr. The new hdr will contain a b_pabd
	* buffer which will be freed in arc_write().
	*/
	nhdr = arc_hdr_alloc(spa, psize, lsize, protected,
	- compress, hdr->b_complevel, type, HDR_HAS_RABD(hdr));
	+ compress, hdr->b_complevel, type);
	ASSERT3P(nhdr->b_l1hdr.b_buf, ==, NULL);
	ASSERT0(nhdr->b_l1hdr.b_bufcnt);
	ASSERT0(zfs_refcount_count(&nhdr->b_l1hdr.b_refcnt));
	VERIFY3U(nhdr->b_type, ==, type);
	ASSERT(!HDR_SHARED_DATA(nhdr));

	nhdr->b_l1hdr.b_buf = buf;
	nhdr->b_l1hdr.b_bufcnt = 1;
	if (ARC_BUF_ENCRYPTED(buf))
	nhdr->b_crypt_hdr.b_ebufcnt = 1;
	- nhdr->b_l1hdr.b_mru_hits = 0;
	- nhdr->b_l1hdr.b_mru_ghost_hits = 0;
	- nhdr->b_l1hdr.b_mfu_hits = 0;
	- nhdr->b_l1hdr.b_mfu_ghost_hits = 0;
	- nhdr->b_l1hdr.b_l2_hits = 0;
	(void) zfs_refcount_add(&nhdr->b_l1hdr.b_refcnt, tag);
	buf->b_hdr = nhdr;

	mutex_exit(&buf->b_evict_lock);
	(void) zfs_refcount_add_many(&arc_anon->arcs_size,
	arc_buf_size(buf), buf);
	} else {
	mutex_exit(&buf->b_evict_lock);
	ASSERT(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt) == 1);
	/* protected by hash lock, or hdr is on arc_anon */
	ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
	ASSERT(!HDR_IO_IN_PROGRESS(hdr));
	hdr->b_l1hdr.b_mru_hits = 0;
	hdr->b_l1hdr.b_mru_ghost_hits = 0;
	hdr->b_l1hdr.b_mfu_hits = 0;
	hdr->b_l1hdr.b_mfu_ghost_hits = 0;
	- hdr->b_l1hdr.b_l2_hits = 0;
	arc_change_state(arc_anon, hdr, hash_lock);
	hdr->b_l1hdr.b_arc_access = 0;

	mutex_exit(hash_lock);
	buf_discard_identity(hdr);
	arc_buf_thaw(buf);
	}
	}

	int
	arc_released(arc_buf_t *buf)
	{
	int released;

	mutex_enter(&buf->b_evict_lock);
	released = (buf->b_data != NULL &&
	buf->b_hdr->b_l1hdr.b_state == arc_anon);
	mutex_exit(&buf->b_evict_lock);
	return (released);
	}

	#ifdef ZFS_DEBUG
	int
	arc_referenced(arc_buf_t *buf)
	{
	int referenced;

	mutex_enter(&buf->b_evict_lock);
	referenced = (zfs_refcount_count(&buf->b_hdr->b_l1hdr.b_refcnt));
	mutex_exit(&buf->b_evict_lock);
	return (referenced);
	}
	#endif

	static void
	arc_write_ready(zio_t *zio)
	{
	arc_write_callback_t *callback = zio->io_private;
	arc_buf_t *buf = callback->awcb_buf;
	arc_buf_hdr_t *hdr = buf->b_hdr;
	blkptr_t *bp = zio->io_bp;
	uint64_t psize = BP_IS_HOLE(bp) ? 0 : BP_GET_PSIZE(bp);
	fstrans_cookie_t cookie = spl_fstrans_mark();

	ASSERT(HDR_HAS_L1HDR(hdr));
	ASSERT(!zfs_refcount_is_zero(&buf->b_hdr->b_l1hdr.b_refcnt));
	ASSERT(hdr->b_l1hdr.b_bufcnt > 0);

	/*
	* If we're reexecuting this zio because the pool suspended, then
	* cleanup any state that was previously set the first time the
	* callback was invoked.
	*/
	if (zio->io_flags & ZIO_FLAG_REEXECUTED) {
	arc_cksum_free(hdr);
	arc_buf_unwatch(buf);
	if (hdr->b_l1hdr.b_pabd != NULL) {
	if (arc_buf_is_shared(buf)) {
	arc_unshare_buf(hdr, buf);
	} else {
	arc_hdr_free_abd(hdr, B_FALSE);
	}
	}

	if (HDR_HAS_RABD(hdr))
	arc_hdr_free_abd(hdr, B_TRUE);
	}
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
	ASSERT(!HDR_HAS_RABD(hdr));
	ASSERT(!HDR_SHARED_DATA(hdr));
	ASSERT(!arc_buf_is_shared(buf));

	callback->awcb_ready(zio, buf, callback->awcb_private);

	if (HDR_IO_IN_PROGRESS(hdr))
	ASSERT(zio->io_flags & ZIO_FLAG_REEXECUTED);

	arc_hdr_set_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);

	if (BP_IS_PROTECTED(bp) != !!HDR_PROTECTED(hdr))
	hdr = arc_hdr_realloc_crypt(hdr, BP_IS_PROTECTED(bp));

	if (BP_IS_PROTECTED(bp)) {
	/* ZIL blocks are written through zio_rewrite */
	ASSERT3U(BP_GET_TYPE(bp), !=, DMU_OT_INTENT_LOG);
	ASSERT(HDR_PROTECTED(hdr));

	if (BP_SHOULD_BYTESWAP(bp)) {
	if (BP_GET_LEVEL(bp) > 0) {
	hdr->b_l1hdr.b_byteswap = DMU_BSWAP_UINT64;
	} else {
	hdr->b_l1hdr.b_byteswap =
	DMU_OT_BYTESWAP(BP_GET_TYPE(bp));
	}
	} else {
	hdr->b_l1hdr.b_byteswap = DMU_BSWAP_NUMFUNCS;
	}

	hdr->b_crypt_hdr.b_ot = BP_GET_TYPE(bp);
	hdr->b_crypt_hdr.b_dsobj = zio->io_bookmark.zb_objset;
	zio_crypt_decode_params_bp(bp, hdr->b_crypt_hdr.b_salt,
	hdr->b_crypt_hdr.b_iv);
	zio_crypt_decode_mac_bp(bp, hdr->b_crypt_hdr.b_mac);
	}

	/*
	* If this block was written for raw encryption but the zio layer
	* ended up only authenticating it, adjust the buffer flags now.
	*/
	if (BP_IS_AUTHENTICATED(bp) && ARC_BUF_ENCRYPTED(buf)) {
	arc_hdr_set_flags(hdr, ARC_FLAG_NOAUTH);
	buf->b_flags &= ~ARC_BUF_FLAG_ENCRYPTED;
	if (BP_GET_COMPRESS(bp) == ZIO_COMPRESS_OFF)
	buf->b_flags &= ~ARC_BUF_FLAG_COMPRESSED;
	} else if (BP_IS_HOLE(bp) && ARC_BUF_ENCRYPTED(buf)) {
	buf->b_flags &= ~ARC_BUF_FLAG_ENCRYPTED;
	buf->b_flags &= ~ARC_BUF_FLAG_COMPRESSED;
	}

	/* this must be done after the buffer flags are adjusted */
	arc_cksum_compute(buf);

	enum zio_compress compress;
	if (BP_IS_HOLE(bp) \|\| BP_IS_EMBEDDED(bp)) {
	compress = ZIO_COMPRESS_OFF;
	} else {
	ASSERT3U(HDR_GET_LSIZE(hdr), ==, BP_GET_LSIZE(bp));
	compress = BP_GET_COMPRESS(bp);
	}
	HDR_SET_PSIZE(hdr, psize);
	arc_hdr_set_compress(hdr, compress);
	hdr->b_complevel = zio->io_prop.zp_complevel;

	if (zio->io_error != 0 \|\| psize == 0)
	goto out;

	/*
	* Fill the hdr with data. If the buffer is encrypted we have no choice
	* but to copy the data into b_radb. If the hdr is compressed, the data
	* we want is available from the zio, otherwise we can take it from
	* the buf.
	*
	* We might be able to share the buf's data with the hdr here. However,
	* doing so would cause the ARC to be full of linear ABDs if we write a
	* lot of shareable data. As a compromise, we check whether scattered
	* ABDs are allowed, and assume that if they are then the user wants
	* the ARC to be primarily filled with them regardless of the data being
	* written. Therefore, if they're allowed then we allocate one and copy
	* the data into it; otherwise, we share the data directly if we can.
	*/
	if (ARC_BUF_ENCRYPTED(buf)) {
	ASSERT3U(psize, >, 0);
	ASSERT(ARC_BUF_COMPRESSED(buf));
	- arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT\|ARC_HDR_ALLOC_RDATA);
	+ arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT \| ARC_HDR_ALLOC_RDATA \|
	+ ARC_HDR_USE_RESERVE);
	abd_copy(hdr->b_crypt_hdr.b_rabd, zio->io_abd, psize);
	} else if (zfs_abd_scatter_enabled \|\| !arc_can_share(hdr, buf)) {
	/*
	* Ideally, we would always copy the io_abd into b_pabd, but the
	* user may have disabled compressed ARC, thus we must check the
	* hdr's compression setting rather than the io_bp's.
	*/
	if (BP_IS_ENCRYPTED(bp)) {
	ASSERT3U(psize, >, 0);
	- arc_hdr_alloc_abd(hdr,
	- ARC_HDR_DO_ADAPT\|ARC_HDR_ALLOC_RDATA);
	+ arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT \|
	+ ARC_HDR_ALLOC_RDATA \| ARC_HDR_USE_RESERVE);
	abd_copy(hdr->b_crypt_hdr.b_rabd, zio->io_abd, psize);
	} else if (arc_hdr_get_compress(hdr) != ZIO_COMPRESS_OFF &&
	!ARC_BUF_COMPRESSED(buf)) {
	ASSERT3U(psize, >, 0);
	- arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT);
	+ arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT \|
	+ ARC_HDR_USE_RESERVE);
	abd_copy(hdr->b_l1hdr.b_pabd, zio->io_abd, psize);
	} else {
	ASSERT3U(zio->io_orig_size, ==, arc_hdr_size(hdr));
	- arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT);
	+ arc_hdr_alloc_abd(hdr, ARC_HDR_DO_ADAPT \|
	+ ARC_HDR_USE_RESERVE);
	abd_copy_from_buf(hdr->b_l1hdr.b_pabd, buf->b_data,
	arc_buf_size(buf));
	}
	} else {
	ASSERT3P(buf->b_data, ==, abd_to_buf(zio->io_orig_abd));
	ASSERT3U(zio->io_orig_size, ==, arc_buf_size(buf));
	ASSERT3U(hdr->b_l1hdr.b_bufcnt, ==, 1);

	arc_share_buf(hdr, buf);
	}

	out:
	arc_hdr_verify(hdr, bp);
	spl_fstrans_unmark(cookie);
	}

	static void
	arc_write_children_ready(zio_t *zio)
	{
	arc_write_callback_t *callback = zio->io_private;
	arc_buf_t *buf = callback->awcb_buf;

	callback->awcb_children_ready(zio, buf, callback->awcb_private);
	}

	/*
	* The SPA calls this callback for each physical write that happens on behalf
	* of a logical write. See the comment in dbuf_write_physdone() for details.
	*/
	static void
	arc_write_physdone(zio_t *zio)
	{
	arc_write_callback_t *cb = zio->io_private;
	if (cb->awcb_physdone != NULL)
	cb->awcb_physdone(zio, cb->awcb_buf, cb->awcb_private);
	}

	static void
	arc_write_done(zio_t *zio)
	{
	arc_write_callback_t *callback = zio->io_private;
	arc_buf_t *buf = callback->awcb_buf;
	arc_buf_hdr_t *hdr = buf->b_hdr;

	ASSERT3P(hdr->b_l1hdr.b_acb, ==, NULL);

	if (zio->io_error == 0) {
	arc_hdr_verify(hdr, zio->io_bp);

	if (BP_IS_HOLE(zio->io_bp) \|\| BP_IS_EMBEDDED(zio->io_bp)) {
	buf_discard_identity(hdr);
	} else {
	hdr->b_dva = *BP_IDENTITY(zio->io_bp);
	hdr->b_birth = BP_PHYSICAL_BIRTH(zio->io_bp);
	}
	} else {
	ASSERT(HDR_EMPTY(hdr));
	}

	/*
	* If the block to be written was all-zero or compressed enough to be
	* embedded in the BP, no write was performed so there will be no
	* dva/birth/checksum. The buffer must therefore remain anonymous
	* (and uncached).
	*/
	if (!HDR_EMPTY(hdr)) {
	arc_buf_hdr_t *exists;
	kmutex_t *hash_lock;

	ASSERT3U(zio->io_error, ==, 0);

	arc_cksum_verify(buf);

	exists = buf_hash_insert(hdr, &hash_lock);
	if (exists != NULL) {
	/*
	* This can only happen if we overwrite for
	* sync-to-convergence, because we remove
	* buffers from the hash table when we arc_free().
	*/
	if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
	if (!BP_EQUAL(&zio->io_bp_orig, zio->io_bp))
	panic("bad overwrite, hdr=%p exists=%p",
	(void )hdr, (void )exists);
	ASSERT(zfs_refcount_is_zero(
	&exists->b_l1hdr.b_refcnt));
	arc_change_state(arc_anon, exists, hash_lock);
	arc_hdr_destroy(exists);
	mutex_exit(hash_lock);
	exists = buf_hash_insert(hdr, &hash_lock);
	ASSERT3P(exists, ==, NULL);
	} else if (zio->io_flags & ZIO_FLAG_NOPWRITE) {
	/* nopwrite */
	ASSERT(zio->io_prop.zp_nopwrite);
	if (!BP_EQUAL(&zio->io_bp_orig, zio->io_bp))
	panic("bad nopwrite, hdr=%p exists=%p",
	(void )hdr, (void )exists);
	} else {
	/* Dedup */
	ASSERT(hdr->b_l1hdr.b_bufcnt == 1);
	ASSERT(hdr->b_l1hdr.b_state == arc_anon);
	ASSERT(BP_GET_DEDUP(zio->io_bp));
	ASSERT(BP_GET_LEVEL(zio->io_bp) == 0);
	}
	}
	arc_hdr_clear_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
	/* if it's not anon, we are doing a scrub */
	if (exists == NULL && hdr->b_l1hdr.b_state == arc_anon)
	arc_access(hdr, hash_lock);
	mutex_exit(hash_lock);
	} else {
	arc_hdr_clear_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
	}

	ASSERT(!zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
	callback->awcb_done(zio, buf, callback->awcb_private);

	abd_free(zio->io_abd);
	kmem_free(callback, sizeof (arc_write_callback_t));
	}

	zio_t *
	arc_write(zio_t pio, spa_t spa, uint64_t txg,
	blkptr_t bp, arc_buf_t buf, boolean_t l2arc,
	const zio_prop_t zp, arc_write_done_func_t ready,
	arc_write_done_func_t children_ready, arc_write_done_func_t physdone,
	arc_write_done_func_t done, void private, zio_priority_t priority,
	int zio_flags, const zbookmark_phys_t *zb)
	{
	arc_buf_hdr_t *hdr = buf->b_hdr;
	arc_write_callback_t *callback;
	zio_t *zio;
	zio_prop_t localprop = *zp;

	ASSERT3P(ready, !=, NULL);
	ASSERT3P(done, !=, NULL);
	ASSERT(!HDR_IO_ERROR(hdr));
	ASSERT(!HDR_IO_IN_PROGRESS(hdr));
	ASSERT3P(hdr->b_l1hdr.b_acb, ==, NULL);
	ASSERT3U(hdr->b_l1hdr.b_bufcnt, >, 0);
	if (l2arc)
	arc_hdr_set_flags(hdr, ARC_FLAG_L2CACHE);

	if (ARC_BUF_ENCRYPTED(buf)) {
	ASSERT(ARC_BUF_COMPRESSED(buf));
	localprop.zp_encrypt = B_TRUE;
	localprop.zp_compress = HDR_GET_COMPRESS(hdr);
	localprop.zp_complevel = hdr->b_complevel;
	localprop.zp_byteorder =
	(hdr->b_l1hdr.b_byteswap == DMU_BSWAP_NUMFUNCS) ?
	ZFS_HOST_BYTEORDER : !ZFS_HOST_BYTEORDER;
	bcopy(hdr->b_crypt_hdr.b_salt, localprop.zp_salt,
	ZIO_DATA_SALT_LEN);
	bcopy(hdr->b_crypt_hdr.b_iv, localprop.zp_iv,
	ZIO_DATA_IV_LEN);
	bcopy(hdr->b_crypt_hdr.b_mac, localprop.zp_mac,
	ZIO_DATA_MAC_LEN);
	if (DMU_OT_IS_ENCRYPTED(localprop.zp_type)) {
	localprop.zp_nopwrite = B_FALSE;
	localprop.zp_copies =
	MIN(localprop.zp_copies, SPA_DVAS_PER_BP - 1);
	}
	zio_flags \|= ZIO_FLAG_RAW;
	} else if (ARC_BUF_COMPRESSED(buf)) {
	ASSERT3U(HDR_GET_LSIZE(hdr), !=, arc_buf_size(buf));
	localprop.zp_compress = HDR_GET_COMPRESS(hdr);
	localprop.zp_complevel = hdr->b_complevel;
	zio_flags \|= ZIO_FLAG_RAW_COMPRESS;
	}
	callback = kmem_zalloc(sizeof (arc_write_callback_t), KM_SLEEP);
	callback->awcb_ready = ready;
	callback->awcb_children_ready = children_ready;
	callback->awcb_physdone = physdone;
	callback->awcb_done = done;
	callback->awcb_private = private;
	callback->awcb_buf = buf;

	/*
	* The hdr's b_pabd is now stale, free it now. A new data block
	* will be allocated when the zio pipeline calls arc_write_ready().
	*/
	if (hdr->b_l1hdr.b_pabd != NULL) {
	/*
	* If the buf is currently sharing the data block with
	* the hdr then we need to break that relationship here.
	* The hdr will remain with a NULL data pointer and the
	* buf will take sole ownership of the block.
	*/
	if (arc_buf_is_shared(buf)) {
	arc_unshare_buf(hdr, buf);
	} else {
	arc_hdr_free_abd(hdr, B_FALSE);
	}
	VERIFY3P(buf->b_data, !=, NULL);
	}

	if (HDR_HAS_RABD(hdr))
	arc_hdr_free_abd(hdr, B_TRUE);

	if (!(zio_flags & ZIO_FLAG_RAW))
	arc_hdr_set_compress(hdr, ZIO_COMPRESS_OFF);

	ASSERT(!arc_buf_is_shared(buf));
	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);

	zio = zio_write(pio, spa, txg, bp,
	abd_get_from_buf(buf->b_data, HDR_GET_LSIZE(hdr)),
	HDR_GET_LSIZE(hdr), arc_buf_size(buf), &localprop, arc_write_ready,
	(children_ready != NULL) ? arc_write_children_ready : NULL,
	arc_write_physdone, arc_write_done, callback,
	priority, zio_flags, zb);

	return (zio);
	}

	void
	arc_tempreserve_clear(uint64_t reserve)
	{
	atomic_add_64(&arc_tempreserve, -reserve);
	ASSERT((int64_t)arc_tempreserve >= 0);
	}

	int
	arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg)
	{
	int error;
	uint64_t anon_size;

	if (!arc_no_grow &&
	reserve > arc_c/4 &&
	reserve * 4 > (2ULL << SPA_MAXBLOCKSHIFT))
	arc_c = MIN(arc_c_max, reserve * 4);

	/*
	* Throttle when the calculated memory footprint for the TXG
	* exceeds the target ARC size.
	*/
	if (reserve > arc_c) {
	DMU_TX_STAT_BUMP(dmu_tx_memory_reserve);
	return (SET_ERROR(ERESTART));
	}

	/*
	* Don't count loaned bufs as in flight dirty data to prevent long
	* network delays from blocking transactions that are ready to be
	* assigned to a txg.
	*/

	/* assert that it has not wrapped around */
	ASSERT3S(atomic_add_64_nv(&arc_loaned_bytes, 0), >=, 0);

	anon_size = MAX((int64_t)(zfs_refcount_count(&arc_anon->arcs_size) -
	arc_loaned_bytes), 0);

	/*
	* Writes will, almost always, require additional memory allocations
	* in order to compress/encrypt/etc the data. We therefore need to
	* make sure that there is sufficient available memory for this.
	*/
	error = arc_memory_throttle(spa, reserve, txg);
	if (error != 0)
	return (error);

	/*
	* Throttle writes when the amount of dirty data in the cache
	* gets too large. We try to keep the cache less than half full
	* of dirty blocks so that our sync times don't grow too large.
	*
	* In the case of one pool being built on another pool, we want
	* to make sure we don't end up throttling the lower (backing)
	* pool when the upper pool is the majority contributor to dirty
	* data. To insure we make forward progress during throttling, we
	* also check the current pool's net dirty data and only throttle
	* if it exceeds zfs_arc_pool_dirty_percent of the anonymous dirty
	* data in the cache.
	*
	* Note: if two requests come in concurrently, we might let them
	* both succeed, when one of them should fail. Not a huge deal.
	*/
	uint64_t total_dirty = reserve + arc_tempreserve + anon_size;
	uint64_t spa_dirty_anon = spa_dirty_data(spa);
	uint64_t rarc_c = arc_warm ? arc_c : arc_c_max;
	if (total_dirty > rarc_c * zfs_arc_dirty_limit_percent / 100 &&
	anon_size > rarc_c * zfs_arc_anon_limit_percent / 100 &&
	spa_dirty_anon > anon_size * zfs_arc_pool_dirty_percent / 100) {
	#ifdef ZFS_DEBUG
	uint64_t meta_esize = zfs_refcount_count(
	&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
	uint64_t data_esize =
	zfs_refcount_count(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
	dprintf("failing, arc_tempreserve=%lluK anon_meta=%lluK "
	"anon_data=%lluK tempreserve=%lluK rarc_c=%lluK\n",
	(u_longlong_t)arc_tempreserve >> 10,
	(u_longlong_t)meta_esize >> 10,
	(u_longlong_t)data_esize >> 10,
	(u_longlong_t)reserve >> 10,
	(u_longlong_t)rarc_c >> 10);
	#endif
	DMU_TX_STAT_BUMP(dmu_tx_dirty_throttle);
	return (SET_ERROR(ERESTART));
	}
	atomic_add_64(&arc_tempreserve, reserve);
	return (0);
	}

	static void
	arc_kstat_update_state(arc_state_t state, kstat_named_t size,
	kstat_named_t evict_data, kstat_named_t evict_metadata)
	{
	size->value.ui64 = zfs_refcount_count(&state->arcs_size);
	evict_data->value.ui64 =
	zfs_refcount_count(&state->arcs_esize[ARC_BUFC_DATA]);
	evict_metadata->value.ui64 =
	zfs_refcount_count(&state->arcs_esize[ARC_BUFC_METADATA]);
	}

	static int
	arc_kstat_update(kstat_t *ksp, int rw)
	{
	arc_stats_t *as = ksp->ks_data;

	if (rw == KSTAT_WRITE)
	return (SET_ERROR(EACCES));

	as->arcstat_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_hits);
	as->arcstat_misses.value.ui64 =
	wmsum_value(&arc_sums.arcstat_misses);
	as->arcstat_demand_data_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_demand_data_hits);
	as->arcstat_demand_data_misses.value.ui64 =
	wmsum_value(&arc_sums.arcstat_demand_data_misses);
	as->arcstat_demand_metadata_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_demand_metadata_hits);
	as->arcstat_demand_metadata_misses.value.ui64 =
	wmsum_value(&arc_sums.arcstat_demand_metadata_misses);
	as->arcstat_prefetch_data_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_prefetch_data_hits);
	as->arcstat_prefetch_data_misses.value.ui64 =
	wmsum_value(&arc_sums.arcstat_prefetch_data_misses);
	as->arcstat_prefetch_metadata_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_prefetch_metadata_hits);
	as->arcstat_prefetch_metadata_misses.value.ui64 =
	wmsum_value(&arc_sums.arcstat_prefetch_metadata_misses);
	as->arcstat_mru_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_mru_hits);
	as->arcstat_mru_ghost_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_mru_ghost_hits);
	as->arcstat_mfu_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_mfu_hits);
	as->arcstat_mfu_ghost_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_mfu_ghost_hits);
	as->arcstat_deleted.value.ui64 =
	wmsum_value(&arc_sums.arcstat_deleted);
	as->arcstat_mutex_miss.value.ui64 =
	wmsum_value(&arc_sums.arcstat_mutex_miss);
	as->arcstat_access_skip.value.ui64 =
	wmsum_value(&arc_sums.arcstat_access_skip);
	as->arcstat_evict_skip.value.ui64 =
	wmsum_value(&arc_sums.arcstat_evict_skip);
	as->arcstat_evict_not_enough.value.ui64 =
	wmsum_value(&arc_sums.arcstat_evict_not_enough);
	as->arcstat_evict_l2_cached.value.ui64 =
	wmsum_value(&arc_sums.arcstat_evict_l2_cached);
	as->arcstat_evict_l2_eligible.value.ui64 =
	wmsum_value(&arc_sums.arcstat_evict_l2_eligible);
	as->arcstat_evict_l2_eligible_mfu.value.ui64 =
	wmsum_value(&arc_sums.arcstat_evict_l2_eligible_mfu);
	as->arcstat_evict_l2_eligible_mru.value.ui64 =
	wmsum_value(&arc_sums.arcstat_evict_l2_eligible_mru);
	as->arcstat_evict_l2_ineligible.value.ui64 =
	wmsum_value(&arc_sums.arcstat_evict_l2_ineligible);
	as->arcstat_evict_l2_skip.value.ui64 =
	wmsum_value(&arc_sums.arcstat_evict_l2_skip);
	as->arcstat_hash_collisions.value.ui64 =
	wmsum_value(&arc_sums.arcstat_hash_collisions);
	as->arcstat_hash_chains.value.ui64 =
	wmsum_value(&arc_sums.arcstat_hash_chains);
	as->arcstat_size.value.ui64 =
	aggsum_value(&arc_sums.arcstat_size);
	as->arcstat_compressed_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_compressed_size);
	as->arcstat_uncompressed_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_uncompressed_size);
	as->arcstat_overhead_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_overhead_size);
	as->arcstat_hdr_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_hdr_size);
	as->arcstat_data_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_data_size);
	as->arcstat_metadata_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_metadata_size);
	as->arcstat_dbuf_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_dbuf_size);
	#if defined(COMPAT_FREEBSD11)
	as->arcstat_other_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_bonus_size) +
	aggsum_value(&arc_sums.arcstat_dnode_size) +
	wmsum_value(&arc_sums.arcstat_dbuf_size);
	#endif

	arc_kstat_update_state(arc_anon,
	&as->arcstat_anon_size,
	&as->arcstat_anon_evictable_data,
	&as->arcstat_anon_evictable_metadata);
	arc_kstat_update_state(arc_mru,
	&as->arcstat_mru_size,
	&as->arcstat_mru_evictable_data,
	&as->arcstat_mru_evictable_metadata);
	arc_kstat_update_state(arc_mru_ghost,
	&as->arcstat_mru_ghost_size,
	&as->arcstat_mru_ghost_evictable_data,
	&as->arcstat_mru_ghost_evictable_metadata);
	arc_kstat_update_state(arc_mfu,
	&as->arcstat_mfu_size,
	&as->arcstat_mfu_evictable_data,
	&as->arcstat_mfu_evictable_metadata);
	arc_kstat_update_state(arc_mfu_ghost,
	&as->arcstat_mfu_ghost_size,
	&as->arcstat_mfu_ghost_evictable_data,
	&as->arcstat_mfu_ghost_evictable_metadata);

	as->arcstat_dnode_size.value.ui64 =
	aggsum_value(&arc_sums.arcstat_dnode_size);
	as->arcstat_bonus_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_bonus_size);
	as->arcstat_l2_hits.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_hits);
	as->arcstat_l2_misses.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_misses);
	as->arcstat_l2_prefetch_asize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_prefetch_asize);
	as->arcstat_l2_mru_asize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_mru_asize);
	as->arcstat_l2_mfu_asize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_mfu_asize);
	as->arcstat_l2_bufc_data_asize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_bufc_data_asize);
	as->arcstat_l2_bufc_metadata_asize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_bufc_metadata_asize);
	as->arcstat_l2_feeds.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_feeds);
	as->arcstat_l2_rw_clash.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rw_clash);
	as->arcstat_l2_read_bytes.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_read_bytes);
	as->arcstat_l2_write_bytes.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_write_bytes);
	as->arcstat_l2_writes_sent.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_writes_sent);
	as->arcstat_l2_writes_done.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_writes_done);
	as->arcstat_l2_writes_error.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_writes_error);
	as->arcstat_l2_writes_lock_retry.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_writes_lock_retry);
	as->arcstat_l2_evict_lock_retry.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_evict_lock_retry);
	as->arcstat_l2_evict_reading.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_evict_reading);
	as->arcstat_l2_evict_l1cached.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_evict_l1cached);
	as->arcstat_l2_free_on_write.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_free_on_write);
	as->arcstat_l2_abort_lowmem.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_abort_lowmem);
	as->arcstat_l2_cksum_bad.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_cksum_bad);
	as->arcstat_l2_io_error.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_io_error);
	as->arcstat_l2_lsize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_lsize);
	as->arcstat_l2_psize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_psize);
	as->arcstat_l2_hdr_size.value.ui64 =
	aggsum_value(&arc_sums.arcstat_l2_hdr_size);
	as->arcstat_l2_log_blk_writes.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_log_blk_writes);
	as->arcstat_l2_log_blk_asize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_log_blk_asize);
	as->arcstat_l2_log_blk_count.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_log_blk_count);
	as->arcstat_l2_rebuild_success.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_success);
	as->arcstat_l2_rebuild_abort_unsupported.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_abort_unsupported);
	as->arcstat_l2_rebuild_abort_io_errors.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_abort_io_errors);
	as->arcstat_l2_rebuild_abort_dh_errors.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_abort_dh_errors);
	as->arcstat_l2_rebuild_abort_cksum_lb_errors.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_abort_cksum_lb_errors);
	as->arcstat_l2_rebuild_abort_lowmem.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_abort_lowmem);
	as->arcstat_l2_rebuild_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_size);
	as->arcstat_l2_rebuild_asize.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_asize);
	as->arcstat_l2_rebuild_bufs.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_bufs);
	as->arcstat_l2_rebuild_bufs_precached.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_bufs_precached);
	as->arcstat_l2_rebuild_log_blks.value.ui64 =
	wmsum_value(&arc_sums.arcstat_l2_rebuild_log_blks);
	as->arcstat_memory_throttle_count.value.ui64 =
	wmsum_value(&arc_sums.arcstat_memory_throttle_count);
	as->arcstat_memory_direct_count.value.ui64 =
	wmsum_value(&arc_sums.arcstat_memory_direct_count);
	as->arcstat_memory_indirect_count.value.ui64 =
	wmsum_value(&arc_sums.arcstat_memory_indirect_count);

	as->arcstat_memory_all_bytes.value.ui64 =
	arc_all_memory();
	as->arcstat_memory_free_bytes.value.ui64 =
	arc_free_memory();
	as->arcstat_memory_available_bytes.value.i64 =
	arc_available_memory();

	as->arcstat_prune.value.ui64 =
	wmsum_value(&arc_sums.arcstat_prune);
	as->arcstat_meta_used.value.ui64 =
	aggsum_value(&arc_sums.arcstat_meta_used);
	as->arcstat_async_upgrade_sync.value.ui64 =
	wmsum_value(&arc_sums.arcstat_async_upgrade_sync);
	as->arcstat_demand_hit_predictive_prefetch.value.ui64 =
	wmsum_value(&arc_sums.arcstat_demand_hit_predictive_prefetch);
	as->arcstat_demand_hit_prescient_prefetch.value.ui64 =
	wmsum_value(&arc_sums.arcstat_demand_hit_prescient_prefetch);
	as->arcstat_raw_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_raw_size);
	as->arcstat_cached_only_in_progress.value.ui64 =
	wmsum_value(&arc_sums.arcstat_cached_only_in_progress);
	as->arcstat_abd_chunk_waste_size.value.ui64 =
	wmsum_value(&arc_sums.arcstat_abd_chunk_waste_size);

	return (0);
	}

	/*
	* This function must return indices evenly distributed between all
	* sublists of the multilist. This is needed due to how the ARC eviction
	* code is laid out; arc_evict_state() assumes ARC buffers are evenly
	* distributed between all sublists and uses this assumption when
	* deciding which sublist to evict from and how much to evict from it.
	*/
	static unsigned int
	arc_state_multilist_index_func(multilist_t ml, void obj)
	{
	arc_buf_hdr_t *hdr = obj;

	/*
	* We rely on b_dva to generate evenly distributed index
	* numbers using buf_hash below. So, as an added precaution,
	* let's make sure we never add empty buffers to the arc lists.
	*/
	ASSERT(!HDR_EMPTY(hdr));

	/*
	* The assumption here, is the hash value for a given
	* arc_buf_hdr_t will remain constant throughout its lifetime
	* (i.e. its b_spa, b_dva, and b_birth fields don't change).
	* Thus, we don't need to store the header's sublist index
	* on insertion, as this index can be recalculated on removal.
	*
	* Also, the low order bits of the hash value are thought to be
	* distributed evenly. Otherwise, in the case that the multilist
	* has a power of two number of sublists, each sublists' usage
	* would not be evenly distributed. In this context full 64bit
	* division would be a waste of time, so limit it to 32 bits.
	*/
	return ((unsigned int)buf_hash(hdr->b_spa, &hdr->b_dva, hdr->b_birth) %
	multilist_get_num_sublists(ml));
	}

	+static unsigned int
	+arc_state_l2c_multilist_index_func(multilist_t ml, void obj)
	+{
	+ panic("Header %p insert into arc_l2c_only %p", obj, ml);
	+}
	+
	#define WARN_IF_TUNING_IGNORED(tuning, value, do_warn) do { \
	if ((do_warn) && (tuning) && ((tuning) != (value))) { \
	cmn_err(CE_WARN, \
	"ignoring tunable %s (using %llu instead)", \
	(#tuning), (value)); \
	} \
	} while (0)

	/*
	* Called during module initialization and periodically thereafter to
	* apply reasonable changes to the exposed performance tunings. Can also be
	* called explicitly by param_set_arc_*() functions when ARC tunables are
	* updated manually. Non-zero zfs_* values which differ from the currently set
	* values will be applied.
	*/
	void
	arc_tuning_update(boolean_t verbose)
	{
	uint64_t allmem = arc_all_memory();
	unsigned long limit;

	/* Valid range: 32M - <arc_c_max> */
	if ((zfs_arc_min) && (zfs_arc_min != arc_c_min) &&
	(zfs_arc_min >= 2ULL << SPA_MAXBLOCKSHIFT) &&
	(zfs_arc_min <= arc_c_max)) {
	arc_c_min = zfs_arc_min;
	arc_c = MAX(arc_c, arc_c_min);
	}
	WARN_IF_TUNING_IGNORED(zfs_arc_min, arc_c_min, verbose);

	/* Valid range: 64M - <all physical memory> */
	if ((zfs_arc_max) && (zfs_arc_max != arc_c_max) &&
	- (zfs_arc_max >= 64 << 20) && (zfs_arc_max < allmem) &&
	+ (zfs_arc_max >= MIN_ARC_MAX) && (zfs_arc_max < allmem) &&
	(zfs_arc_max > arc_c_min)) {
	arc_c_max = zfs_arc_max;
	arc_c = MIN(arc_c, arc_c_max);
	arc_p = (arc_c >> 1);
	if (arc_meta_limit > arc_c_max)
	arc_meta_limit = arc_c_max;
	if (arc_dnode_size_limit > arc_meta_limit)
	arc_dnode_size_limit = arc_meta_limit;
	}
	WARN_IF_TUNING_IGNORED(zfs_arc_max, arc_c_max, verbose);

	/* Valid range: 16M - <arc_c_max> */
	if ((zfs_arc_meta_min) && (zfs_arc_meta_min != arc_meta_min) &&
	(zfs_arc_meta_min >= 1ULL << SPA_MAXBLOCKSHIFT) &&
	(zfs_arc_meta_min <= arc_c_max)) {
	arc_meta_min = zfs_arc_meta_min;
	if (arc_meta_limit < arc_meta_min)
	arc_meta_limit = arc_meta_min;
	if (arc_dnode_size_limit < arc_meta_min)
	arc_dnode_size_limit = arc_meta_min;
	}
	WARN_IF_TUNING_IGNORED(zfs_arc_meta_min, arc_meta_min, verbose);

	/* Valid range: <arc_meta_min> - <arc_c_max> */
	limit = zfs_arc_meta_limit ? zfs_arc_meta_limit :
	MIN(zfs_arc_meta_limit_percent, 100) * arc_c_max / 100;
	if ((limit != arc_meta_limit) &&
	(limit >= arc_meta_min) &&
	(limit <= arc_c_max))
	arc_meta_limit = limit;
	WARN_IF_TUNING_IGNORED(zfs_arc_meta_limit, arc_meta_limit, verbose);

	/* Valid range: <arc_meta_min> - <arc_meta_limit> */
	limit = zfs_arc_dnode_limit ? zfs_arc_dnode_limit :
	MIN(zfs_arc_dnode_limit_percent, 100) * arc_meta_limit / 100;
	if ((limit != arc_dnode_size_limit) &&
	(limit >= arc_meta_min) &&
	(limit <= arc_meta_limit))
	arc_dnode_size_limit = limit;
	WARN_IF_TUNING_IGNORED(zfs_arc_dnode_limit, arc_dnode_size_limit,
	verbose);

	/* Valid range: 1 - N */
	if (zfs_arc_grow_retry)
	arc_grow_retry = zfs_arc_grow_retry;

	/* Valid range: 1 - N */
	if (zfs_arc_shrink_shift) {
	arc_shrink_shift = zfs_arc_shrink_shift;
	arc_no_grow_shift = MIN(arc_no_grow_shift, arc_shrink_shift -1);
	}

	/* Valid range: 1 - N */
	if (zfs_arc_p_min_shift)
	arc_p_min_shift = zfs_arc_p_min_shift;

	/* Valid range: 1 - N ms */
	if (zfs_arc_min_prefetch_ms)
	arc_min_prefetch_ms = zfs_arc_min_prefetch_ms;

	/* Valid range: 1 - N ms */
	if (zfs_arc_min_prescient_prefetch_ms) {
	arc_min_prescient_prefetch_ms =
	zfs_arc_min_prescient_prefetch_ms;
	}

	/* Valid range: 0 - 100 */
	if ((zfs_arc_lotsfree_percent >= 0) &&
	(zfs_arc_lotsfree_percent <= 100))
	arc_lotsfree_percent = zfs_arc_lotsfree_percent;
	WARN_IF_TUNING_IGNORED(zfs_arc_lotsfree_percent, arc_lotsfree_percent,
	verbose);

	/* Valid range: 0 - <all physical memory> */
	if ((zfs_arc_sys_free) && (zfs_arc_sys_free != arc_sys_free))
	arc_sys_free = MIN(MAX(zfs_arc_sys_free, 0), allmem);
	WARN_IF_TUNING_IGNORED(zfs_arc_sys_free, arc_sys_free, verbose);
	}

	static void
	arc_state_init(void)
	{
	- arc_anon = &ARC_anon;
	- arc_mru = &ARC_mru;
	- arc_mru_ghost = &ARC_mru_ghost;
	- arc_mfu = &ARC_mfu;
	- arc_mfu_ghost = &ARC_mfu_ghost;
	- arc_l2c_only = &ARC_l2c_only;
	-
	multilist_create(&arc_mru->arcs_list[ARC_BUFC_METADATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	arc_state_multilist_index_func);
	multilist_create(&arc_mru->arcs_list[ARC_BUFC_DATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	arc_state_multilist_index_func);
	multilist_create(&arc_mru_ghost->arcs_list[ARC_BUFC_METADATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	arc_state_multilist_index_func);
	multilist_create(&arc_mru_ghost->arcs_list[ARC_BUFC_DATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	arc_state_multilist_index_func);
	multilist_create(&arc_mfu->arcs_list[ARC_BUFC_METADATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	arc_state_multilist_index_func);
	multilist_create(&arc_mfu->arcs_list[ARC_BUFC_DATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	arc_state_multilist_index_func);
	multilist_create(&arc_mfu_ghost->arcs_list[ARC_BUFC_METADATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	arc_state_multilist_index_func);
	multilist_create(&arc_mfu_ghost->arcs_list[ARC_BUFC_DATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	arc_state_multilist_index_func);
	+ /*
	+ * L2 headers should never be on the L2 state list since they don't
	+ * have L1 headers allocated. Special index function asserts that.
	+ */
	multilist_create(&arc_l2c_only->arcs_list[ARC_BUFC_METADATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	- arc_state_multilist_index_func);
	+ arc_state_l2c_multilist_index_func);
	multilist_create(&arc_l2c_only->arcs_list[ARC_BUFC_DATA],
	sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
	- arc_state_multilist_index_func);
	+ arc_state_l2c_multilist_index_func);

	zfs_refcount_create(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_create(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_create(&arc_mru->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_create(&arc_mru->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_create(&arc_mru_ghost->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_create(&arc_mru_ghost->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_create(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_create(&arc_mfu->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_create(&arc_mfu_ghost->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_create(&arc_mfu_ghost->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_create(&arc_l2c_only->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_create(&arc_l2c_only->arcs_esize[ARC_BUFC_DATA]);

	zfs_refcount_create(&arc_anon->arcs_size);
	zfs_refcount_create(&arc_mru->arcs_size);
	zfs_refcount_create(&arc_mru_ghost->arcs_size);
	zfs_refcount_create(&arc_mfu->arcs_size);
	zfs_refcount_create(&arc_mfu_ghost->arcs_size);
	zfs_refcount_create(&arc_l2c_only->arcs_size);

	wmsum_init(&arc_sums.arcstat_hits, 0);
	wmsum_init(&arc_sums.arcstat_misses, 0);
	wmsum_init(&arc_sums.arcstat_demand_data_hits, 0);
	wmsum_init(&arc_sums.arcstat_demand_data_misses, 0);
	wmsum_init(&arc_sums.arcstat_demand_metadata_hits, 0);
	wmsum_init(&arc_sums.arcstat_demand_metadata_misses, 0);
	wmsum_init(&arc_sums.arcstat_prefetch_data_hits, 0);
	wmsum_init(&arc_sums.arcstat_prefetch_data_misses, 0);
	wmsum_init(&arc_sums.arcstat_prefetch_metadata_hits, 0);
	wmsum_init(&arc_sums.arcstat_prefetch_metadata_misses, 0);
	wmsum_init(&arc_sums.arcstat_mru_hits, 0);
	wmsum_init(&arc_sums.arcstat_mru_ghost_hits, 0);
	wmsum_init(&arc_sums.arcstat_mfu_hits, 0);
	wmsum_init(&arc_sums.arcstat_mfu_ghost_hits, 0);
	wmsum_init(&arc_sums.arcstat_deleted, 0);
	wmsum_init(&arc_sums.arcstat_mutex_miss, 0);
	wmsum_init(&arc_sums.arcstat_access_skip, 0);
	wmsum_init(&arc_sums.arcstat_evict_skip, 0);
	wmsum_init(&arc_sums.arcstat_evict_not_enough, 0);
	wmsum_init(&arc_sums.arcstat_evict_l2_cached, 0);
	wmsum_init(&arc_sums.arcstat_evict_l2_eligible, 0);
	wmsum_init(&arc_sums.arcstat_evict_l2_eligible_mfu, 0);
	wmsum_init(&arc_sums.arcstat_evict_l2_eligible_mru, 0);
	wmsum_init(&arc_sums.arcstat_evict_l2_ineligible, 0);
	wmsum_init(&arc_sums.arcstat_evict_l2_skip, 0);
	wmsum_init(&arc_sums.arcstat_hash_collisions, 0);
	wmsum_init(&arc_sums.arcstat_hash_chains, 0);
	aggsum_init(&arc_sums.arcstat_size, 0);
	wmsum_init(&arc_sums.arcstat_compressed_size, 0);
	wmsum_init(&arc_sums.arcstat_uncompressed_size, 0);
	wmsum_init(&arc_sums.arcstat_overhead_size, 0);
	wmsum_init(&arc_sums.arcstat_hdr_size, 0);
	wmsum_init(&arc_sums.arcstat_data_size, 0);
	wmsum_init(&arc_sums.arcstat_metadata_size, 0);
	wmsum_init(&arc_sums.arcstat_dbuf_size, 0);
	aggsum_init(&arc_sums.arcstat_dnode_size, 0);
	wmsum_init(&arc_sums.arcstat_bonus_size, 0);
	wmsum_init(&arc_sums.arcstat_l2_hits, 0);
	wmsum_init(&arc_sums.arcstat_l2_misses, 0);
	wmsum_init(&arc_sums.arcstat_l2_prefetch_asize, 0);
	wmsum_init(&arc_sums.arcstat_l2_mru_asize, 0);
	wmsum_init(&arc_sums.arcstat_l2_mfu_asize, 0);
	wmsum_init(&arc_sums.arcstat_l2_bufc_data_asize, 0);
	wmsum_init(&arc_sums.arcstat_l2_bufc_metadata_asize, 0);
	wmsum_init(&arc_sums.arcstat_l2_feeds, 0);
	wmsum_init(&arc_sums.arcstat_l2_rw_clash, 0);
	wmsum_init(&arc_sums.arcstat_l2_read_bytes, 0);
	wmsum_init(&arc_sums.arcstat_l2_write_bytes, 0);
	wmsum_init(&arc_sums.arcstat_l2_writes_sent, 0);
	wmsum_init(&arc_sums.arcstat_l2_writes_done, 0);
	wmsum_init(&arc_sums.arcstat_l2_writes_error, 0);
	wmsum_init(&arc_sums.arcstat_l2_writes_lock_retry, 0);
	wmsum_init(&arc_sums.arcstat_l2_evict_lock_retry, 0);
	wmsum_init(&arc_sums.arcstat_l2_evict_reading, 0);
	wmsum_init(&arc_sums.arcstat_l2_evict_l1cached, 0);
	wmsum_init(&arc_sums.arcstat_l2_free_on_write, 0);
	wmsum_init(&arc_sums.arcstat_l2_abort_lowmem, 0);
	wmsum_init(&arc_sums.arcstat_l2_cksum_bad, 0);
	wmsum_init(&arc_sums.arcstat_l2_io_error, 0);
	wmsum_init(&arc_sums.arcstat_l2_lsize, 0);
	wmsum_init(&arc_sums.arcstat_l2_psize, 0);
	aggsum_init(&arc_sums.arcstat_l2_hdr_size, 0);
	wmsum_init(&arc_sums.arcstat_l2_log_blk_writes, 0);
	wmsum_init(&arc_sums.arcstat_l2_log_blk_asize, 0);
	wmsum_init(&arc_sums.arcstat_l2_log_blk_count, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_success, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_abort_unsupported, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_abort_io_errors, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_abort_dh_errors, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_abort_cksum_lb_errors, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_abort_lowmem, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_size, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_asize, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_bufs, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_bufs_precached, 0);
	wmsum_init(&arc_sums.arcstat_l2_rebuild_log_blks, 0);
	wmsum_init(&arc_sums.arcstat_memory_throttle_count, 0);
	wmsum_init(&arc_sums.arcstat_memory_direct_count, 0);
	wmsum_init(&arc_sums.arcstat_memory_indirect_count, 0);
	wmsum_init(&arc_sums.arcstat_prune, 0);
	aggsum_init(&arc_sums.arcstat_meta_used, 0);
	wmsum_init(&arc_sums.arcstat_async_upgrade_sync, 0);
	wmsum_init(&arc_sums.arcstat_demand_hit_predictive_prefetch, 0);
	wmsum_init(&arc_sums.arcstat_demand_hit_prescient_prefetch, 0);
	wmsum_init(&arc_sums.arcstat_raw_size, 0);
	wmsum_init(&arc_sums.arcstat_cached_only_in_progress, 0);
	wmsum_init(&arc_sums.arcstat_abd_chunk_waste_size, 0);

	arc_anon->arcs_state = ARC_STATE_ANON;
	arc_mru->arcs_state = ARC_STATE_MRU;
	arc_mru_ghost->arcs_state = ARC_STATE_MRU_GHOST;
	arc_mfu->arcs_state = ARC_STATE_MFU;
	arc_mfu_ghost->arcs_state = ARC_STATE_MFU_GHOST;
	arc_l2c_only->arcs_state = ARC_STATE_L2C_ONLY;
	}

	static void
	arc_state_fini(void)
	{
	zfs_refcount_destroy(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_destroy(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_destroy(&arc_mru->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_destroy(&arc_mru->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_destroy(&arc_mru_ghost->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_destroy(&arc_mru_ghost->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_destroy(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_destroy(&arc_mfu->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_destroy(&arc_mfu_ghost->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_destroy(&arc_mfu_ghost->arcs_esize[ARC_BUFC_DATA]);
	zfs_refcount_destroy(&arc_l2c_only->arcs_esize[ARC_BUFC_METADATA]);
	zfs_refcount_destroy(&arc_l2c_only->arcs_esize[ARC_BUFC_DATA]);

	zfs_refcount_destroy(&arc_anon->arcs_size);
	zfs_refcount_destroy(&arc_mru->arcs_size);
	zfs_refcount_destroy(&arc_mru_ghost->arcs_size);
	zfs_refcount_destroy(&arc_mfu->arcs_size);
	zfs_refcount_destroy(&arc_mfu_ghost->arcs_size);
	zfs_refcount_destroy(&arc_l2c_only->arcs_size);

	multilist_destroy(&arc_mru->arcs_list[ARC_BUFC_METADATA]);
	multilist_destroy(&arc_mru_ghost->arcs_list[ARC_BUFC_METADATA]);
	multilist_destroy(&arc_mfu->arcs_list[ARC_BUFC_METADATA]);
	multilist_destroy(&arc_mfu_ghost->arcs_list[ARC_BUFC_METADATA]);
	multilist_destroy(&arc_mru->arcs_list[ARC_BUFC_DATA]);
	multilist_destroy(&arc_mru_ghost->arcs_list[ARC_BUFC_DATA]);
	multilist_destroy(&arc_mfu->arcs_list[ARC_BUFC_DATA]);
	multilist_destroy(&arc_mfu_ghost->arcs_list[ARC_BUFC_DATA]);
	multilist_destroy(&arc_l2c_only->arcs_list[ARC_BUFC_METADATA]);
	multilist_destroy(&arc_l2c_only->arcs_list[ARC_BUFC_DATA]);

	wmsum_fini(&arc_sums.arcstat_hits);
	wmsum_fini(&arc_sums.arcstat_misses);
	wmsum_fini(&arc_sums.arcstat_demand_data_hits);
	wmsum_fini(&arc_sums.arcstat_demand_data_misses);
	wmsum_fini(&arc_sums.arcstat_demand_metadata_hits);
	wmsum_fini(&arc_sums.arcstat_demand_metadata_misses);
	wmsum_fini(&arc_sums.arcstat_prefetch_data_hits);
	wmsum_fini(&arc_sums.arcstat_prefetch_data_misses);
	wmsum_fini(&arc_sums.arcstat_prefetch_metadata_hits);
	wmsum_fini(&arc_sums.arcstat_prefetch_metadata_misses);
	wmsum_fini(&arc_sums.arcstat_mru_hits);
	wmsum_fini(&arc_sums.arcstat_mru_ghost_hits);
	wmsum_fini(&arc_sums.arcstat_mfu_hits);
	wmsum_fini(&arc_sums.arcstat_mfu_ghost_hits);
	wmsum_fini(&arc_sums.arcstat_deleted);
	wmsum_fini(&arc_sums.arcstat_mutex_miss);
	wmsum_fini(&arc_sums.arcstat_access_skip);
	wmsum_fini(&arc_sums.arcstat_evict_skip);
	wmsum_fini(&arc_sums.arcstat_evict_not_enough);
	wmsum_fini(&arc_sums.arcstat_evict_l2_cached);
	wmsum_fini(&arc_sums.arcstat_evict_l2_eligible);
	wmsum_fini(&arc_sums.arcstat_evict_l2_eligible_mfu);
	wmsum_fini(&arc_sums.arcstat_evict_l2_eligible_mru);
	wmsum_fini(&arc_sums.arcstat_evict_l2_ineligible);
	wmsum_fini(&arc_sums.arcstat_evict_l2_skip);
	wmsum_fini(&arc_sums.arcstat_hash_collisions);
	wmsum_fini(&arc_sums.arcstat_hash_chains);
	aggsum_fini(&arc_sums.arcstat_size);
	wmsum_fini(&arc_sums.arcstat_compressed_size);
	wmsum_fini(&arc_sums.arcstat_uncompressed_size);
	wmsum_fini(&arc_sums.arcstat_overhead_size);
	wmsum_fini(&arc_sums.arcstat_hdr_size);
	wmsum_fini(&arc_sums.arcstat_data_size);
	wmsum_fini(&arc_sums.arcstat_metadata_size);
	wmsum_fini(&arc_sums.arcstat_dbuf_size);
	aggsum_fini(&arc_sums.arcstat_dnode_size);
	wmsum_fini(&arc_sums.arcstat_bonus_size);
	wmsum_fini(&arc_sums.arcstat_l2_hits);
	wmsum_fini(&arc_sums.arcstat_l2_misses);
	wmsum_fini(&arc_sums.arcstat_l2_prefetch_asize);
	wmsum_fini(&arc_sums.arcstat_l2_mru_asize);
	wmsum_fini(&arc_sums.arcstat_l2_mfu_asize);
	wmsum_fini(&arc_sums.arcstat_l2_bufc_data_asize);
	wmsum_fini(&arc_sums.arcstat_l2_bufc_metadata_asize);
	wmsum_fini(&arc_sums.arcstat_l2_feeds);
	wmsum_fini(&arc_sums.arcstat_l2_rw_clash);
	wmsum_fini(&arc_sums.arcstat_l2_read_bytes);
	wmsum_fini(&arc_sums.arcstat_l2_write_bytes);
	wmsum_fini(&arc_sums.arcstat_l2_writes_sent);
	wmsum_fini(&arc_sums.arcstat_l2_writes_done);
	wmsum_fini(&arc_sums.arcstat_l2_writes_error);
	wmsum_fini(&arc_sums.arcstat_l2_writes_lock_retry);
	wmsum_fini(&arc_sums.arcstat_l2_evict_lock_retry);
	wmsum_fini(&arc_sums.arcstat_l2_evict_reading);
	wmsum_fini(&arc_sums.arcstat_l2_evict_l1cached);
	wmsum_fini(&arc_sums.arcstat_l2_free_on_write);
	wmsum_fini(&arc_sums.arcstat_l2_abort_lowmem);
	wmsum_fini(&arc_sums.arcstat_l2_cksum_bad);
	wmsum_fini(&arc_sums.arcstat_l2_io_error);
	wmsum_fini(&arc_sums.arcstat_l2_lsize);
	wmsum_fini(&arc_sums.arcstat_l2_psize);
	aggsum_fini(&arc_sums.arcstat_l2_hdr_size);
	wmsum_fini(&arc_sums.arcstat_l2_log_blk_writes);
	wmsum_fini(&arc_sums.arcstat_l2_log_blk_asize);
	wmsum_fini(&arc_sums.arcstat_l2_log_blk_count);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_success);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_abort_unsupported);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_abort_io_errors);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_abort_dh_errors);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_abort_cksum_lb_errors);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_abort_lowmem);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_size);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_asize);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_bufs);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_bufs_precached);
	wmsum_fini(&arc_sums.arcstat_l2_rebuild_log_blks);
	wmsum_fini(&arc_sums.arcstat_memory_throttle_count);
	wmsum_fini(&arc_sums.arcstat_memory_direct_count);
	wmsum_fini(&arc_sums.arcstat_memory_indirect_count);
	wmsum_fini(&arc_sums.arcstat_prune);
	aggsum_fini(&arc_sums.arcstat_meta_used);
	wmsum_fini(&arc_sums.arcstat_async_upgrade_sync);
	wmsum_fini(&arc_sums.arcstat_demand_hit_predictive_prefetch);
	wmsum_fini(&arc_sums.arcstat_demand_hit_prescient_prefetch);
	wmsum_fini(&arc_sums.arcstat_raw_size);
	wmsum_fini(&arc_sums.arcstat_cached_only_in_progress);
	wmsum_fini(&arc_sums.arcstat_abd_chunk_waste_size);
	}

	uint64_t
	arc_target_bytes(void)
	{
	return (arc_c);
	}

	void
	arc_set_limits(uint64_t allmem)
	{
	/* Set min cache to 1/32 of all memory, or 32MB, whichever is more. */
	arc_c_min = MAX(allmem / 32, 2ULL << SPA_MAXBLOCKSHIFT);

	/* How to set default max varies by platform. */
	arc_c_max = arc_default_max(arc_c_min, allmem);
	}
	void
	arc_init(void)
	{
	uint64_t percent, allmem = arc_all_memory();
	mutex_init(&arc_evict_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&arc_evict_waiters, sizeof (arc_evict_waiter_t),
	offsetof(arc_evict_waiter_t, aew_node));

	arc_min_prefetch_ms = 1000;
	arc_min_prescient_prefetch_ms = 6000;

	#if defined(_KERNEL)
	arc_lowmem_init();
	#endif

	arc_set_limits(allmem);

	-#ifndef _KERNEL
	+#ifdef _KERNEL
	+ /*
	+ * If zfs_arc_max is non-zero at init, meaning it was set in the kernel
	+ * environment before the module was loaded, don't block setting the
	+ * maximum because it is less than arc_c_min, instead, reset arc_c_min
	+ * to a lower value.
	+ * zfs_arc_min will be handled by arc_tuning_update().
	+ */
	+ if (zfs_arc_max != 0 && zfs_arc_max >= MIN_ARC_MAX &&
	+ zfs_arc_max < allmem) {
	+ arc_c_max = zfs_arc_max;
	+ if (arc_c_min >= arc_c_max) {
	+ arc_c_min = MAX(zfs_arc_max / 2,
	+ 2ULL << SPA_MAXBLOCKSHIFT);
	+ }
	+ }
	+#else
	/*
	* In userland, there's only the memory pressure that we artificially
	* create (see arc_available_memory()). Don't let arc_c get too
	* small, because it can cause transactions to be larger than
	* arc_c, causing arc_tempreserve_space() to fail.
	*/
	arc_c_min = MAX(arc_c_max / 2, 2ULL << SPA_MAXBLOCKSHIFT);
	#endif

	arc_c = arc_c_min;
	arc_p = (arc_c >> 1);

	/* Set min to 1/2 of arc_c_min */
	arc_meta_min = 1ULL << SPA_MAXBLOCKSHIFT;
	/*
	* Set arc_meta_limit to a percent of arc_c_max with a floor of
	* arc_meta_min, and a ceiling of arc_c_max.
	*/
	percent = MIN(zfs_arc_meta_limit_percent, 100);
	arc_meta_limit = MAX(arc_meta_min, (percent * arc_c_max) / 100);
	percent = MIN(zfs_arc_dnode_limit_percent, 100);
	arc_dnode_size_limit = (percent * arc_meta_limit) / 100;

	/* Apply user specified tunings */
	arc_tuning_update(B_TRUE);

	/* if kmem_flags are set, lets try to use less memory */
	if (kmem_debugging())
	arc_c = arc_c / 2;
	if (arc_c < arc_c_min)
	arc_c = arc_c_min;

	arc_register_hotplug();

	arc_state_init();

	buf_init();

	list_create(&arc_prune_list, sizeof (arc_prune_t),
	offsetof(arc_prune_t, p_node));
	mutex_init(&arc_prune_mtx, NULL, MUTEX_DEFAULT, NULL);

	arc_prune_taskq = taskq_create("arc_prune", 100, defclsyspri,
	boot_ncpus, INT_MAX, TASKQ_PREPOPULATE \| TASKQ_DYNAMIC \|
	TASKQ_THREADS_CPU_PCT);

	arc_ksp = kstat_create("zfs", 0, "arcstats", "misc", KSTAT_TYPE_NAMED,
	sizeof (arc_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);

	if (arc_ksp != NULL) {
	arc_ksp->ks_data = &arc_stats;
	arc_ksp->ks_update = arc_kstat_update;
	kstat_install(arc_ksp);
	}

	arc_evict_zthr = zthr_create("arc_evict",
	- arc_evict_cb_check, arc_evict_cb, NULL);
	+ arc_evict_cb_check, arc_evict_cb, NULL, defclsyspri);
	arc_reap_zthr = zthr_create_timer("arc_reap",
	- arc_reap_cb_check, arc_reap_cb, NULL, SEC2NSEC(1));
	+ arc_reap_cb_check, arc_reap_cb, NULL, SEC2NSEC(1), minclsyspri);

	arc_warm = B_FALSE;

	/*
	* Calculate maximum amount of dirty data per pool.
	*
	* If it has been set by a module parameter, take that.
	* Otherwise, use a percentage of physical memory defined by
	* zfs_dirty_data_max_percent (default 10%) with a cap at
	* zfs_dirty_data_max_max (default 4G or 25% of physical memory).
	*/
	#ifdef __LP64__
	if (zfs_dirty_data_max_max == 0)
	zfs_dirty_data_max_max = MIN(4ULL * 1024 * 1024 * 1024,
	allmem * zfs_dirty_data_max_max_percent / 100);
	#else
	if (zfs_dirty_data_max_max == 0)
	zfs_dirty_data_max_max = MIN(1ULL * 1024 * 1024 * 1024,
	allmem * zfs_dirty_data_max_max_percent / 100);
	#endif

	if (zfs_dirty_data_max == 0) {
	zfs_dirty_data_max = allmem *
	zfs_dirty_data_max_percent / 100;
	zfs_dirty_data_max = MIN(zfs_dirty_data_max,
	zfs_dirty_data_max_max);
	}
	}

	void
	arc_fini(void)
	{
	arc_prune_t *p;

	#ifdef _KERNEL
	arc_lowmem_fini();
	#endif /* _KERNEL */

	/* Use B_TRUE to ensure all buffers are evicted */
	arc_flush(NULL, B_TRUE);

	if (arc_ksp != NULL) {
	kstat_delete(arc_ksp);
	arc_ksp = NULL;
	}

	taskq_wait(arc_prune_taskq);
	taskq_destroy(arc_prune_taskq);

	mutex_enter(&arc_prune_mtx);
	while ((p = list_head(&arc_prune_list)) != NULL) {
	list_remove(&arc_prune_list, p);
	zfs_refcount_remove(&p->p_refcnt, &arc_prune_list);
	zfs_refcount_destroy(&p->p_refcnt);
	kmem_free(p, sizeof (*p));
	}
	mutex_exit(&arc_prune_mtx);

	list_destroy(&arc_prune_list);
	mutex_destroy(&arc_prune_mtx);

	(void) zthr_cancel(arc_evict_zthr);
	(void) zthr_cancel(arc_reap_zthr);

	mutex_destroy(&arc_evict_lock);
	list_destroy(&arc_evict_waiters);

	/*
	* Free any buffers that were tagged for destruction. This needs
	* to occur before arc_state_fini() runs and destroys the aggsum
	* values which are updated when freeing scatter ABDs.
	*/
	l2arc_do_free_on_write();

	/*
	* buf_fini() must proceed arc_state_fini() because buf_fin() may
	* trigger the release of kmem magazines, which can callback to
	* arc_space_return() which accesses aggsums freed in act_state_fini().
	*/
	buf_fini();
	arc_state_fini();

	arc_unregister_hotplug();

	/*
	* We destroy the zthrs after all the ARC state has been
	* torn down to avoid the case of them receiving any
	* wakeup() signals after they are destroyed.
	*/
	zthr_destroy(arc_evict_zthr);
	zthr_destroy(arc_reap_zthr);

	ASSERT0(arc_loaned_bytes);
	}

	/*
	* Level 2 ARC
	*
	* The level 2 ARC (L2ARC) is a cache layer in-between main memory and disk.
	* It uses dedicated storage devices to hold cached data, which are populated
	* using large infrequent writes. The main role of this cache is to boost
	* the performance of random read workloads. The intended L2ARC devices
	* include short-stroked disks, solid state disks, and other media with
	* substantially faster read latency than disk.
	*
	* +-----------------------+
	* \| ARC \|
	* +-----------------------+
	* \| ^ ^
	* \| \| \|
	* l2arc_feed_thread() arc_read()
	* \| \| \|
	* \| l2arc read \|
	* V \| \|
	* +---------------+ \|
	* \| L2ARC \| \|
	* +---------------+ \|
	* \| ^ \|
	* l2arc_write() \| \|
	* \| \| \|
	* V \| \|
	* +-------+ +-------+
	* \| vdev \| \| vdev \|
	* \| cache \| \| cache \|
	* +-------+ +-------+
	* +=========+ .-----.
	* : L2ARC : \|-_____-\|
	* : devices : \| Disks \|
	* +=========+ `-_____-'
	*
	* Read requests are satisfied from the following sources, in order:
	*
	* 1) ARC
	* 2) vdev cache of L2ARC devices
	* 3) L2ARC devices
	* 4) vdev cache of disks
	* 5) disks
	*
	* Some L2ARC device types exhibit extremely slow write performance.
	* To accommodate for this there are some significant differences between
	* the L2ARC and traditional cache design:
	*
	* 1. There is no eviction path from the ARC to the L2ARC. Evictions from
	* the ARC behave as usual, freeing buffers and placing headers on ghost
	* lists. The ARC does not send buffers to the L2ARC during eviction as
	* this would add inflated write latencies for all ARC memory pressure.
	*
	* 2. The L2ARC attempts to cache data from the ARC before it is evicted.
	* It does this by periodically scanning buffers from the eviction-end of
	* the MFU and MRU ARC lists, copying them to the L2ARC devices if they are
	* not already there. It scans until a headroom of buffers is satisfied,
	* which itself is a buffer for ARC eviction. If a compressible buffer is
	* found during scanning and selected for writing to an L2ARC device, we
	* temporarily boost scanning headroom during the next scan cycle to make
	* sure we adapt to compression effects (which might significantly reduce
	* the data volume we write to L2ARC). The thread that does this is
	* l2arc_feed_thread(), illustrated below; example sizes are included to
	* provide a better sense of ratio than this diagram:
	*
	* head --> tail
	* +---------------------+----------+
	* ARC_mfu \|:::::#:::::::::::::::\|o#o###o###\|-->. # already on L2ARC
	* +---------------------+----------+ \| o L2ARC eligible
	* ARC_mru \|:#:::::::::::::::::::\|#o#ooo####\|-->\| : ARC buffer
	* +---------------------+----------+ \|
	* 15.9 Gbytes ^ 32 Mbytes \|
	* headroom \|
	* l2arc_feed_thread()
	* \|
	* l2arc write hand <--[oooo]--'
	* \| 8 Mbyte
	* \| write max
	* V
	* +==============================+
	* L2ARC dev \|####\|#\|###\|###\| \|####\| ... \|
	* +==============================+
	* 32 Gbytes
	*
	* 3. If an ARC buffer is copied to the L2ARC but then hit instead of
	* evicted, then the L2ARC has cached a buffer much sooner than it probably
	* needed to, potentially wasting L2ARC device bandwidth and storage. It is
	* safe to say that this is an uncommon case, since buffers at the end of
	* the ARC lists have moved there due to inactivity.
	*
	* 4. If the ARC evicts faster than the L2ARC can maintain a headroom,
	* then the L2ARC simply misses copying some buffers. This serves as a
	* pressure valve to prevent heavy read workloads from both stalling the ARC
	* with waits and clogging the L2ARC with writes. This also helps prevent
	* the potential for the L2ARC to churn if it attempts to cache content too
	* quickly, such as during backups of the entire pool.
	*
	* 5. After system boot and before the ARC has filled main memory, there are
	* no evictions from the ARC and so the tails of the ARC_mfu and ARC_mru
	* lists can remain mostly static. Instead of searching from tail of these
	* lists as pictured, the l2arc_feed_thread() will search from the list heads
	* for eligible buffers, greatly increasing its chance of finding them.
	*
	* The L2ARC device write speed is also boosted during this time so that
	* the L2ARC warms up faster. Since there have been no ARC evictions yet,
	* there are no L2ARC reads, and no fear of degrading read performance
	* through increased writes.
	*
	* 6. Writes to the L2ARC devices are grouped and sent in-sequence, so that
	* the vdev queue can aggregate them into larger and fewer writes. Each
	* device is written to in a rotor fashion, sweeping writes through
	* available space then repeating.
	*
	* 7. The L2ARC does not store dirty content. It never needs to flush
	* write buffers back to disk based storage.
	*
	* 8. If an ARC buffer is written (and dirtied) which also exists in the
	* L2ARC, the now stale L2ARC buffer is immediately dropped.
	*
	* The performance of the L2ARC can be tweaked by a number of tunables, which
	* may be necessary for different workloads:
	*
	* l2arc_write_max max write bytes per interval
	* l2arc_write_boost extra write bytes during device warmup
	* l2arc_noprefetch skip caching prefetched buffers
	* l2arc_headroom number of max device writes to precache
	* l2arc_headroom_boost when we find compressed buffers during ARC
	* scanning, we multiply headroom by this
	* percentage factor for the next scan cycle,
	* since more compressed buffers are likely to
	* be present
	* l2arc_feed_secs seconds between L2ARC writing
	*
	* Tunables may be removed or added as future performance improvements are
	* integrated, and also may become zpool properties.
	*
	* There are three key functions that control how the L2ARC warms up:
	*
	* l2arc_write_eligible() check if a buffer is eligible to cache
	* l2arc_write_size() calculate how much to write
	* l2arc_write_interval() calculate sleep delay between writes
	*
	* These three functions determine what to write, how much, and how quickly
	* to send writes.
	*
	* L2ARC persistence:
	*
	* When writing buffers to L2ARC, we periodically add some metadata to
	* make sure we can pick them up after reboot, thus dramatically reducing
	* the impact that any downtime has on the performance of storage systems
	* with large caches.
	*
	* The implementation works fairly simply by integrating the following two
	* modifications:
	*
	* *) When writing to the L2ARC, we occasionally write a "l2arc log block",
	* which is an additional piece of metadata which describes what's been
	* written. This allows us to rebuild the arc_buf_hdr_t structures of the
	* main ARC buffers. There are 2 linked-lists of log blocks headed by
	* dh_start_lbps[2]. We alternate which chain we append to, so they are
	* time-wise and offset-wise interleaved, but that is an optimization rather
	* than for correctness. The log block also includes a pointer to the
	* previous block in its chain.
	*
	* *) We reserve SPA_MINBLOCKSIZE of space at the start of each L2ARC device
	* for our header bookkeeping purposes. This contains a device header,
	* which contains our top-level reference structures. We update it each
	* time we write a new log block, so that we're able to locate it in the
	* L2ARC device. If this write results in an inconsistent device header
	* (e.g. due to power failure), we detect this by verifying the header's
	* checksum and simply fail to reconstruct the L2ARC after reboot.
	*
	* Implementation diagram:
	*
	* +=== L2ARC device (not to scale) ======================================+
	* \| ___two newest log block pointers__.__________ \|
	* \| / \dh_start_lbps[1] \|
	* \| / \ \dh_start_lbps[0]\|
	* \|.___/__. V V \|
	* \|\|L2 dev\|....\|lb \|bufs \|lb \|bufs \|lb \|bufs \|lb \|bufs \|lb \|---(empty)---\|
	* \|\| hdr\| ^ /^ /^ / / \|
	* \|+------+ ...--\-------/ \-----/--\------/ / \|
	* \| \--------------/ \--------------/ \|
	* +======================================================================+
	*
	* As can be seen on the diagram, rather than using a simple linked list,
	* we use a pair of linked lists with alternating elements. This is a
	* performance enhancement due to the fact that we only find out the
	* address of the next log block access once the current block has been
	* completely read in. Obviously, this hurts performance, because we'd be
	* keeping the device's I/O queue at only a 1 operation deep, thus
	* incurring a large amount of I/O round-trip latency. Having two lists
	* allows us to fetch two log blocks ahead of where we are currently
	* rebuilding L2ARC buffers.
	*
	* On-device data structures:
	*
	* L2ARC device header: l2arc_dev_hdr_phys_t
	* L2ARC log block: l2arc_log_blk_phys_t
	*
	* L2ARC reconstruction:
	*
	* When writing data, we simply write in the standard rotary fashion,
	* evicting buffers as we go and simply writing new data over them (writing
	* a new log block every now and then). This obviously means that once we
	* loop around the end of the device, we will start cutting into an already
	* committed log block (and its referenced data buffers), like so:
	*
	* current write head__ __old tail
	* \ /
	* V V
	* <--\|bufs \|lb \|bufs \|lb \| \|bufs \|lb \|bufs \|lb \|-->
	* ^ ^^^^^^^^^___________________________________
	* \| \
	* <<nextwrite>> may overwrite this blk and/or its bufs --'
	*
	* When importing the pool, we detect this situation and use it to stop
	* our scanning process (see l2arc_rebuild).
	*
	* There is one significant caveat to consider when rebuilding ARC contents
	* from an L2ARC device: what about invalidated buffers? Given the above
	* construction, we cannot update blocks which we've already written to amend
	* them to remove buffers which were invalidated. Thus, during reconstruction,
	* we might be populating the cache with buffers for data that's not on the
	* main pool anymore, or may have been overwritten!
	*
	* As it turns out, this isn't a problem. Every arc_read request includes
	* both the DVA and, crucially, the birth TXG of the BP the caller is
	* looking for. So even if the cache were populated by completely rotten
	* blocks for data that had been long deleted and/or overwritten, we'll
	* never actually return bad data from the cache, since the DVA with the
	* birth TXG uniquely identify a block in space and time - once created,
	* a block is immutable on disk. The worst thing we have done is wasted
	* some time and memory at l2arc rebuild to reconstruct outdated ARC
	* entries that will get dropped from the l2arc as it is being updated
	* with new blocks.
	*
	* L2ARC buffers that have been evicted by l2arc_evict() ahead of the write
	* hand are not restored. This is done by saving the offset (in bytes)
	* l2arc_evict() has evicted to in the L2ARC device header and taking it
	* into account when restoring buffers.
	*/

	static boolean_t
	l2arc_write_eligible(uint64_t spa_guid, arc_buf_hdr_t *hdr)
	{
	/*
	* A buffer is not eligible for the L2ARC if it:
	* 1. belongs to a different spa.
	* 2. is already cached on the L2ARC.
	* 3. has an I/O in progress (it may be an incomplete read).
	* 4. is flagged not eligible (zfs property).
	*/
	if (hdr->b_spa != spa_guid \|\| HDR_HAS_L2HDR(hdr) \|\|
	HDR_IO_IN_PROGRESS(hdr) \|\| !HDR_L2CACHE(hdr))
	return (B_FALSE);

	return (B_TRUE);
	}

	static uint64_t
	l2arc_write_size(l2arc_dev_t *dev)
	{
	uint64_t size, dev_size, tsize;

	/*
	* Make sure our globals have meaningful values in case the user
	* altered them.
	*/
	size = l2arc_write_max;
	if (size == 0) {
	cmn_err(CE_NOTE, "Bad value for l2arc_write_max, value must "
	"be greater than zero, resetting it to the default (%d)",
	L2ARC_WRITE_SIZE);
	size = l2arc_write_max = L2ARC_WRITE_SIZE;
	}

	if (arc_warm == B_FALSE)
	size += l2arc_write_boost;

	/*
	* Make sure the write size does not exceed the size of the cache
	* device. This is important in l2arc_evict(), otherwise infinite
	* iteration can occur.
	*/
	dev_size = dev->l2ad_end - dev->l2ad_start;
	tsize = size + l2arc_log_blk_overhead(size, dev);
	if (dev->l2ad_vdev->vdev_has_trim && l2arc_trim_ahead > 0)
	tsize += MAX(64 * 1024 * 1024,
	(tsize * l2arc_trim_ahead) / 100);

	if (tsize >= dev_size) {
	cmn_err(CE_NOTE, "l2arc_write_max or l2arc_write_boost "
	"plus the overhead of log blocks (persistent L2ARC, "
	"%llu bytes) exceeds the size of the cache device "
	"(guid %llu), resetting them to the default (%d)",
	l2arc_log_blk_overhead(size, dev),
	dev->l2ad_vdev->vdev_guid, L2ARC_WRITE_SIZE);
	size = l2arc_write_max = l2arc_write_boost = L2ARC_WRITE_SIZE;

	if (arc_warm == B_FALSE)
	size += l2arc_write_boost;
	}

	return (size);

	}

	static clock_t
	l2arc_write_interval(clock_t began, uint64_t wanted, uint64_t wrote)
	{
	clock_t interval, next, now;

	/*
	* If the ARC lists are busy, increase our write rate; if the
	* lists are stale, idle back. This is achieved by checking
	* how much we previously wrote - if it was more than half of
	* what we wanted, schedule the next write much sooner.
	*/
	if (l2arc_feed_again && wrote > (wanted / 2))
	interval = (hz * l2arc_feed_min_ms) / 1000;
	else
	interval = hz * l2arc_feed_secs;

	now = ddi_get_lbolt();
	next = MAX(now, MIN(now + interval, began + interval));

	return (next);
	}

	/*
	* Cycle through L2ARC devices. This is how L2ARC load balances.
	* If a device is returned, this also returns holding the spa config lock.
	*/
	static l2arc_dev_t *
	l2arc_dev_get_next(void)
	{
	l2arc_dev_t first, next = NULL;

	/*
	* Lock out the removal of spas (spa_namespace_lock), then removal
	* of cache devices (l2arc_dev_mtx). Once a device has been selected,
	* both locks will be dropped and a spa config lock held instead.
	*/
	mutex_enter(&spa_namespace_lock);
	mutex_enter(&l2arc_dev_mtx);

	/* if there are no vdevs, there is nothing to do */
	if (l2arc_ndev == 0)
	goto out;

	first = NULL;
	next = l2arc_dev_last;
	do {
	/* loop around the list looking for a non-faulted vdev */
	if (next == NULL) {
	next = list_head(l2arc_dev_list);
	} else {
	next = list_next(l2arc_dev_list, next);
	if (next == NULL)
	next = list_head(l2arc_dev_list);
	}

	/* if we have come back to the start, bail out */
	if (first == NULL)
	first = next;
	else if (next == first)
	break;

	} while (vdev_is_dead(next->l2ad_vdev) \|\| next->l2ad_rebuild \|\|
	next->l2ad_trim_all);

	/* if we were unable to find any usable vdevs, return NULL */
	if (vdev_is_dead(next->l2ad_vdev) \|\| next->l2ad_rebuild \|\|
	next->l2ad_trim_all)
	next = NULL;

	l2arc_dev_last = next;

	out:
	mutex_exit(&l2arc_dev_mtx);

	/*
	* Grab the config lock to prevent the 'next' device from being
	* removed while we are writing to it.
	*/
	if (next != NULL)
	spa_config_enter(next->l2ad_spa, SCL_L2ARC, next, RW_READER);
	mutex_exit(&spa_namespace_lock);

	return (next);
	}

	/*
	* Free buffers that were tagged for destruction.
	*/
	static void
	l2arc_do_free_on_write(void)
	{
	list_t *buflist;
	l2arc_data_free_t df, df_prev;

	mutex_enter(&l2arc_free_on_write_mtx);
	buflist = l2arc_free_on_write;

	for (df = list_tail(buflist); df; df = df_prev) {
	df_prev = list_prev(buflist, df);
	ASSERT3P(df->l2df_abd, !=, NULL);
	abd_free(df->l2df_abd);
	list_remove(buflist, df);
	kmem_free(df, sizeof (l2arc_data_free_t));
	}

	mutex_exit(&l2arc_free_on_write_mtx);
	}

	/*
	* A write to a cache device has completed. Update all headers to allow
	* reads from these buffers to begin.
	*/
	static void
	l2arc_write_done(zio_t *zio)
	{
	l2arc_write_callback_t *cb;
	l2arc_lb_abd_buf_t *abd_buf;
	l2arc_lb_ptr_buf_t *lb_ptr_buf;
	l2arc_dev_t *dev;
	l2arc_dev_hdr_phys_t *l2dhdr;
	list_t *buflist;
	arc_buf_hdr_t head, hdr, *hdr_prev;
	kmutex_t *hash_lock;
	int64_t bytes_dropped = 0;

	cb = zio->io_private;
	ASSERT3P(cb, !=, NULL);
	dev = cb->l2wcb_dev;
	l2dhdr = dev->l2ad_dev_hdr;
	ASSERT3P(dev, !=, NULL);
	head = cb->l2wcb_head;
	ASSERT3P(head, !=, NULL);
	buflist = &dev->l2ad_buflist;
	ASSERT3P(buflist, !=, NULL);
	DTRACE_PROBE2(l2arc__iodone, zio_t *, zio,
	l2arc_write_callback_t *, cb);

	/*
	* All writes completed, or an error was hit.
	*/
	top:
	mutex_enter(&dev->l2ad_mtx);
	for (hdr = list_prev(buflist, head); hdr; hdr = hdr_prev) {
	hdr_prev = list_prev(buflist, hdr);

	hash_lock = HDR_LOCK(hdr);

	/*
	* We cannot use mutex_enter or else we can deadlock
	* with l2arc_write_buffers (due to swapping the order
	* the hash lock and l2ad_mtx are taken).
	*/
	if (!mutex_tryenter(hash_lock)) {
	/*
	* Missed the hash lock. We must retry so we
	* don't leave the ARC_FLAG_L2_WRITING bit set.
	*/
	ARCSTAT_BUMP(arcstat_l2_writes_lock_retry);

	/*
	* We don't want to rescan the headers we've
	* already marked as having been written out, so
	* we reinsert the head node so we can pick up
	* where we left off.
	*/
	list_remove(buflist, head);
	list_insert_after(buflist, hdr, head);

	mutex_exit(&dev->l2ad_mtx);

	/*
	* We wait for the hash lock to become available
	* to try and prevent busy waiting, and increase
	* the chance we'll be able to acquire the lock
	* the next time around.
	*/
	mutex_enter(hash_lock);
	mutex_exit(hash_lock);
	goto top;
	}

	/*
	* We could not have been moved into the arc_l2c_only
	* state while in-flight due to our ARC_FLAG_L2_WRITING
	* bit being set. Let's just ensure that's being enforced.
	*/
	ASSERT(HDR_HAS_L1HDR(hdr));

	/*
	* Skipped - drop L2ARC entry and mark the header as no
	* longer L2 eligibile.
	*/
	if (zio->io_error != 0) {
	/*
	* Error - drop L2ARC entry.
	*/
	list_remove(buflist, hdr);
	arc_hdr_clear_flags(hdr, ARC_FLAG_HAS_L2HDR);

	uint64_t psize = HDR_GET_PSIZE(hdr);
	l2arc_hdr_arcstats_decrement(hdr);

	bytes_dropped +=
	vdev_psize_to_asize(dev->l2ad_vdev, psize);
	(void) zfs_refcount_remove_many(&dev->l2ad_alloc,
	arc_hdr_size(hdr), hdr);
	}

	/*
	* Allow ARC to begin reads and ghost list evictions to
	* this L2ARC entry.
	*/
	arc_hdr_clear_flags(hdr, ARC_FLAG_L2_WRITING);

	mutex_exit(hash_lock);
	}

	/*
	* Free the allocated abd buffers for writing the log blocks.
	* If the zio failed reclaim the allocated space and remove the
	* pointers to these log blocks from the log block pointer list
	* of the L2ARC device.
	*/
	while ((abd_buf = list_remove_tail(&cb->l2wcb_abd_list)) != NULL) {
	abd_free(abd_buf->abd);
	zio_buf_free(abd_buf, sizeof (*abd_buf));
	if (zio->io_error != 0) {
	lb_ptr_buf = list_remove_head(&dev->l2ad_lbptr_list);
	/*
	* L2BLK_GET_PSIZE returns aligned size for log
	* blocks.
	*/
	uint64_t asize =
	L2BLK_GET_PSIZE((lb_ptr_buf->lb_ptr)->lbp_prop);
	bytes_dropped += asize;
	ARCSTAT_INCR(arcstat_l2_log_blk_asize, -asize);
	ARCSTAT_BUMPDOWN(arcstat_l2_log_blk_count);
	zfs_refcount_remove_many(&dev->l2ad_lb_asize, asize,
	lb_ptr_buf);
	zfs_refcount_remove(&dev->l2ad_lb_count, lb_ptr_buf);
	kmem_free(lb_ptr_buf->lb_ptr,
	sizeof (l2arc_log_blkptr_t));
	kmem_free(lb_ptr_buf, sizeof (l2arc_lb_ptr_buf_t));
	}
	}
	list_destroy(&cb->l2wcb_abd_list);

	if (zio->io_error != 0) {
	ARCSTAT_BUMP(arcstat_l2_writes_error);

	/*
	* Restore the lbps array in the header to its previous state.
	* If the list of log block pointers is empty, zero out the
	* log block pointers in the device header.
	*/
	lb_ptr_buf = list_head(&dev->l2ad_lbptr_list);
	for (int i = 0; i < 2; i++) {
	if (lb_ptr_buf == NULL) {
	/*
	* If the list is empty zero out the device
	* header. Otherwise zero out the second log
	* block pointer in the header.
	*/
	if (i == 0) {
	bzero(l2dhdr, dev->l2ad_dev_hdr_asize);
	} else {
	bzero(&l2dhdr->dh_start_lbps[i],
	sizeof (l2arc_log_blkptr_t));
	}
	break;
	}
	bcopy(lb_ptr_buf->lb_ptr, &l2dhdr->dh_start_lbps[i],
	sizeof (l2arc_log_blkptr_t));
	lb_ptr_buf = list_next(&dev->l2ad_lbptr_list,
	lb_ptr_buf);
	}
	}

	ARCSTAT_BUMP(arcstat_l2_writes_done);
	list_remove(buflist, head);
	ASSERT(!HDR_HAS_L1HDR(head));
	kmem_cache_free(hdr_l2only_cache, head);
	mutex_exit(&dev->l2ad_mtx);

	ASSERT(dev->l2ad_vdev != NULL);
	vdev_space_update(dev->l2ad_vdev, -bytes_dropped, 0, 0);

	l2arc_do_free_on_write();

	kmem_free(cb, sizeof (l2arc_write_callback_t));
	}

	static int
	l2arc_untransform(zio_t zio, l2arc_read_callback_t cb)
	{
	int ret;
	spa_t *spa = zio->io_spa;
	arc_buf_hdr_t *hdr = cb->l2rcb_hdr;
	blkptr_t *bp = zio->io_bp;
	uint8_t salt[ZIO_DATA_SALT_LEN];
	uint8_t iv[ZIO_DATA_IV_LEN];
	uint8_t mac[ZIO_DATA_MAC_LEN];
	boolean_t no_crypt = B_FALSE;

	/*
	* ZIL data is never be written to the L2ARC, so we don't need
	* special handling for its unique MAC storage.
	*/
	ASSERT3U(BP_GET_TYPE(bp), !=, DMU_OT_INTENT_LOG);
	ASSERT(MUTEX_HELD(HDR_LOCK(hdr)));
	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);

	/*
	* If the data was encrypted, decrypt it now. Note that
	* we must check the bp here and not the hdr, since the
	* hdr does not have its encryption parameters updated
	* until arc_read_done().
	*/
	if (BP_IS_ENCRYPTED(bp)) {
	abd_t *eabd = arc_get_data_abd(hdr, arc_hdr_size(hdr), hdr,
	- B_TRUE);
	+ ARC_HDR_DO_ADAPT \| ARC_HDR_USE_RESERVE);

	zio_crypt_decode_params_bp(bp, salt, iv);
	zio_crypt_decode_mac_bp(bp, mac);

	ret = spa_do_crypt_abd(B_FALSE, spa, &cb->l2rcb_zb,
	BP_GET_TYPE(bp), BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp),
	salt, iv, mac, HDR_GET_PSIZE(hdr), eabd,
	hdr->b_l1hdr.b_pabd, &no_crypt);
	if (ret != 0) {
	arc_free_data_abd(hdr, eabd, arc_hdr_size(hdr), hdr);
	goto error;
	}

	/*
	* If we actually performed decryption, replace b_pabd
	* with the decrypted data. Otherwise we can just throw
	* our decryption buffer away.
	*/
	if (!no_crypt) {
	arc_free_data_abd(hdr, hdr->b_l1hdr.b_pabd,
	arc_hdr_size(hdr), hdr);
	hdr->b_l1hdr.b_pabd = eabd;
	zio->io_abd = eabd;
	} else {
	arc_free_data_abd(hdr, eabd, arc_hdr_size(hdr), hdr);
	}
	}

	/*
	* If the L2ARC block was compressed, but ARC compression
	* is disabled we decompress the data into a new buffer and
	* replace the existing data.
	*/
	if (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF &&
	!HDR_COMPRESSION_ENABLED(hdr)) {
	abd_t *cabd = arc_get_data_abd(hdr, arc_hdr_size(hdr), hdr,
	- B_TRUE);
	+ ARC_HDR_DO_ADAPT \| ARC_HDR_USE_RESERVE);
	void *tmp = abd_borrow_buf(cabd, arc_hdr_size(hdr));

	ret = zio_decompress_data(HDR_GET_COMPRESS(hdr),
	hdr->b_l1hdr.b_pabd, tmp, HDR_GET_PSIZE(hdr),
	HDR_GET_LSIZE(hdr), &hdr->b_complevel);
	if (ret != 0) {
	abd_return_buf_copy(cabd, tmp, arc_hdr_size(hdr));
	arc_free_data_abd(hdr, cabd, arc_hdr_size(hdr), hdr);
	goto error;
	}

	abd_return_buf_copy(cabd, tmp, arc_hdr_size(hdr));
	arc_free_data_abd(hdr, hdr->b_l1hdr.b_pabd,
	arc_hdr_size(hdr), hdr);
	hdr->b_l1hdr.b_pabd = cabd;
	zio->io_abd = cabd;
	zio->io_size = HDR_GET_LSIZE(hdr);
	}

	return (0);

	error:
	return (ret);
	}


	/*
	* A read to a cache device completed. Validate buffer contents before
	* handing over to the regular ARC routines.
	*/
	static void
	l2arc_read_done(zio_t *zio)
	{
	int tfm_error = 0;
	l2arc_read_callback_t *cb = zio->io_private;
	arc_buf_hdr_t *hdr;
	kmutex_t *hash_lock;
	boolean_t valid_cksum;
	boolean_t using_rdata = (BP_IS_ENCRYPTED(&cb->l2rcb_bp) &&
	(cb->l2rcb_flags & ZIO_FLAG_RAW_ENCRYPT));

	ASSERT3P(zio->io_vd, !=, NULL);
	ASSERT(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE);

	spa_config_exit(zio->io_spa, SCL_L2ARC, zio->io_vd);

	ASSERT3P(cb, !=, NULL);
	hdr = cb->l2rcb_hdr;
	ASSERT3P(hdr, !=, NULL);

	hash_lock = HDR_LOCK(hdr);
	mutex_enter(hash_lock);
	ASSERT3P(hash_lock, ==, HDR_LOCK(hdr));

	/*
	* If the data was read into a temporary buffer,
	* move it and free the buffer.
	*/
	if (cb->l2rcb_abd != NULL) {
	ASSERT3U(arc_hdr_size(hdr), <, zio->io_size);
	if (zio->io_error == 0) {
	if (using_rdata) {
	abd_copy(hdr->b_crypt_hdr.b_rabd,
	cb->l2rcb_abd, arc_hdr_size(hdr));
	} else {
	abd_copy(hdr->b_l1hdr.b_pabd,
	cb->l2rcb_abd, arc_hdr_size(hdr));
	}
	}

	/*
	* The following must be done regardless of whether
	* there was an error:
	* - free the temporary buffer
	* - point zio to the real ARC buffer
	* - set zio size accordingly
	* These are required because zio is either re-used for
	* an I/O of the block in the case of the error
	* or the zio is passed to arc_read_done() and it
	* needs real data.
	*/
	abd_free(cb->l2rcb_abd);
	zio->io_size = zio->io_orig_size = arc_hdr_size(hdr);

	if (using_rdata) {
	ASSERT(HDR_HAS_RABD(hdr));
	zio->io_abd = zio->io_orig_abd =
	hdr->b_crypt_hdr.b_rabd;
	} else {
	ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
	zio->io_abd = zio->io_orig_abd = hdr->b_l1hdr.b_pabd;
	}
	}

	ASSERT3P(zio->io_abd, !=, NULL);

	/*
	* Check this survived the L2ARC journey.
	*/
	ASSERT(zio->io_abd == hdr->b_l1hdr.b_pabd \|\|
	(HDR_HAS_RABD(hdr) && zio->io_abd == hdr->b_crypt_hdr.b_rabd));
	zio->io_bp_copy = cb->l2rcb_bp; /* XXX fix in L2ARC 2.0 */
	zio->io_bp = &zio->io_bp_copy; /* XXX fix in L2ARC 2.0 */
	zio->io_prop.zp_complevel = hdr->b_complevel;

	valid_cksum = arc_cksum_is_equal(hdr, zio);

	/*
	* b_rabd will always match the data as it exists on disk if it is
	* being used. Therefore if we are reading into b_rabd we do not
	* attempt to untransform the data.
	*/
	if (valid_cksum && !using_rdata)
	tfm_error = l2arc_untransform(zio, cb);

	if (valid_cksum && tfm_error == 0 && zio->io_error == 0 &&
	!HDR_L2_EVICTED(hdr)) {
	mutex_exit(hash_lock);
	zio->io_private = hdr;
	arc_read_done(zio);
	} else {
	/*
	* Buffer didn't survive caching. Increment stats and
	* reissue to the original storage device.
	*/
	if (zio->io_error != 0) {
	ARCSTAT_BUMP(arcstat_l2_io_error);
	} else {
	zio->io_error = SET_ERROR(EIO);
	}
	if (!valid_cksum \|\| tfm_error != 0)
	ARCSTAT_BUMP(arcstat_l2_cksum_bad);

	/*
	* If there's no waiter, issue an async i/o to the primary
	* storage now. If there is a waiter, the caller must
	* issue the i/o in a context where it's OK to block.
	*/
	if (zio->io_waiter == NULL) {
	zio_t *pio = zio_unique_parent(zio);
	void *abd = (using_rdata) ?
	hdr->b_crypt_hdr.b_rabd : hdr->b_l1hdr.b_pabd;

	ASSERT(!pio \|\| pio->io_child_type == ZIO_CHILD_LOGICAL);

	zio = zio_read(pio, zio->io_spa, zio->io_bp,
	abd, zio->io_size, arc_read_done,
	hdr, zio->io_priority, cb->l2rcb_flags,
	&cb->l2rcb_zb);

	/*
	* Original ZIO will be freed, so we need to update
	* ARC header with the new ZIO pointer to be used
	* by zio_change_priority() in arc_read().
	*/
	for (struct arc_callback *acb = hdr->b_l1hdr.b_acb;
	acb != NULL; acb = acb->acb_next)
	acb->acb_zio_head = zio;

	mutex_exit(hash_lock);
	zio_nowait(zio);
	} else {
	mutex_exit(hash_lock);
	}
	}

	kmem_free(cb, sizeof (l2arc_read_callback_t));
	}

	/*
	* This is the list priority from which the L2ARC will search for pages to
	* cache. This is used within loops (0..3) to cycle through lists in the
	* desired order. This order can have a significant effect on cache
	* performance.
	*
	* Currently the metadata lists are hit first, MFU then MRU, followed by
	* the data lists. This function returns a locked list, and also returns
	* the lock pointer.
	*/
	static multilist_sublist_t *
	l2arc_sublist_lock(int list_num)
	{
	multilist_t *ml = NULL;
	unsigned int idx;

	ASSERT(list_num >= 0 && list_num < L2ARC_FEED_TYPES);

	switch (list_num) {
	case 0:
	ml = &arc_mfu->arcs_list[ARC_BUFC_METADATA];
	break;
	case 1:
	ml = &arc_mru->arcs_list[ARC_BUFC_METADATA];
	break;
	case 2:
	ml = &arc_mfu->arcs_list[ARC_BUFC_DATA];
	break;
	case 3:
	ml = &arc_mru->arcs_list[ARC_BUFC_DATA];
	break;
	default:
	return (NULL);
	}

	/*
	* Return a randomly-selected sublist. This is acceptable
	* because the caller feeds only a little bit of data for each
	* call (8MB). Subsequent calls will result in different
	* sublists being selected.
	*/
	idx = multilist_get_random_index(ml);
	return (multilist_sublist_lock(ml, idx));
	}

	/*
	* Calculates the maximum overhead of L2ARC metadata log blocks for a given
	* L2ARC write size. l2arc_evict and l2arc_write_size need to include this
	* overhead in processing to make sure there is enough headroom available
	* when writing buffers.
	*/
	static inline uint64_t
	l2arc_log_blk_overhead(uint64_t write_sz, l2arc_dev_t *dev)
	{
	if (dev->l2ad_log_entries == 0) {
	return (0);
	} else {
	uint64_t log_entries = write_sz >> SPA_MINBLOCKSHIFT;

	uint64_t log_blocks = (log_entries +
	dev->l2ad_log_entries - 1) /
	dev->l2ad_log_entries;

	return (vdev_psize_to_asize(dev->l2ad_vdev,
	sizeof (l2arc_log_blk_phys_t)) * log_blocks);
	}
	}

	/*
	* Evict buffers from the device write hand to the distance specified in
	* bytes. This distance may span populated buffers, it may span nothing.
	* This is clearing a region on the L2ARC device ready for writing.
	* If the 'all' boolean is set, every buffer is evicted.
	*/
	static void
	l2arc_evict(l2arc_dev_t *dev, uint64_t distance, boolean_t all)
	{
	list_t *buflist;
	arc_buf_hdr_t hdr, hdr_prev;
	kmutex_t *hash_lock;
	uint64_t taddr;
	l2arc_lb_ptr_buf_t lb_ptr_buf, lb_ptr_buf_prev;
	vdev_t *vd = dev->l2ad_vdev;
	boolean_t rerun;

	buflist = &dev->l2ad_buflist;

	/*
	* We need to add in the worst case scenario of log block overhead.
	*/
	distance += l2arc_log_blk_overhead(distance, dev);
	if (vd->vdev_has_trim && l2arc_trim_ahead > 0) {
	/*
	* Trim ahead of the write size 64MB or (l2arc_trim_ahead/100)
	* times the write size, whichever is greater.
	*/
	distance += MAX(64 * 1024 * 1024,
	(distance * l2arc_trim_ahead) / 100);
	}

	top:
	rerun = B_FALSE;
	if (dev->l2ad_hand >= (dev->l2ad_end - distance)) {
	/*
	* When there is no space to accommodate upcoming writes,
	* evict to the end. Then bump the write and evict hands
	* to the start and iterate. This iteration does not
	* happen indefinitely as we make sure in
	* l2arc_write_size() that when the write hand is reset,
	* the write size does not exceed the end of the device.
	*/
	rerun = B_TRUE;
	taddr = dev->l2ad_end;
	} else {
	taddr = dev->l2ad_hand + distance;
	}
	DTRACE_PROBE4(l2arc__evict, l2arc_dev_t , dev, list_t , buflist,
	uint64_t, taddr, boolean_t, all);

	if (!all) {
	/*
	* This check has to be placed after deciding whether to
	* iterate (rerun).
	*/
	if (dev->l2ad_first) {
	/*
	* This is the first sweep through the device. There is
	* nothing to evict. We have already trimmmed the
	* whole device.
	*/
	goto out;
	} else {
	/*
	* Trim the space to be evicted.
	*/
	if (vd->vdev_has_trim && dev->l2ad_evict < taddr &&
	l2arc_trim_ahead > 0) {
	/*
	* We have to drop the spa_config lock because
	* vdev_trim_range() will acquire it.
	* l2ad_evict already accounts for the label
	* size. To prevent vdev_trim_ranges() from
	* adding it again, we subtract it from
	* l2ad_evict.
	*/
	spa_config_exit(dev->l2ad_spa, SCL_L2ARC, dev);
	vdev_trim_simple(vd,
	dev->l2ad_evict - VDEV_LABEL_START_SIZE,
	taddr - dev->l2ad_evict);
	spa_config_enter(dev->l2ad_spa, SCL_L2ARC, dev,
	RW_READER);
	}

	/*
	* When rebuilding L2ARC we retrieve the evict hand
	* from the header of the device. Of note, l2arc_evict()
	* does not actually delete buffers from the cache
	* device, but trimming may do so depending on the
	* hardware implementation. Thus keeping track of the
	* evict hand is useful.
	*/
	dev->l2ad_evict = MAX(dev->l2ad_evict, taddr);
	}
	}

	retry:
	mutex_enter(&dev->l2ad_mtx);
	/*
	* We have to account for evicted log blocks. Run vdev_space_update()
	* on log blocks whose offset (in bytes) is before the evicted offset
	* (in bytes) by searching in the list of pointers to log blocks
	* present in the L2ARC device.
	*/
	for (lb_ptr_buf = list_tail(&dev->l2ad_lbptr_list); lb_ptr_buf;
	lb_ptr_buf = lb_ptr_buf_prev) {

	lb_ptr_buf_prev = list_prev(&dev->l2ad_lbptr_list, lb_ptr_buf);

	/* L2BLK_GET_PSIZE returns aligned size for log blocks */
	uint64_t asize = L2BLK_GET_PSIZE(
	(lb_ptr_buf->lb_ptr)->lbp_prop);

	/*
	* We don't worry about log blocks left behind (ie
	* lbp_payload_start < l2ad_hand) because l2arc_write_buffers()
	* will never write more than l2arc_evict() evicts.
	*/
	if (!all && l2arc_log_blkptr_valid(dev, lb_ptr_buf->lb_ptr)) {
	break;
	} else {
	vdev_space_update(vd, -asize, 0, 0);
	ARCSTAT_INCR(arcstat_l2_log_blk_asize, -asize);
	ARCSTAT_BUMPDOWN(arcstat_l2_log_blk_count);
	zfs_refcount_remove_many(&dev->l2ad_lb_asize, asize,
	lb_ptr_buf);
	zfs_refcount_remove(&dev->l2ad_lb_count, lb_ptr_buf);
	list_remove(&dev->l2ad_lbptr_list, lb_ptr_buf);
	kmem_free(lb_ptr_buf->lb_ptr,
	sizeof (l2arc_log_blkptr_t));
	kmem_free(lb_ptr_buf, sizeof (l2arc_lb_ptr_buf_t));
	}
	}

	for (hdr = list_tail(buflist); hdr; hdr = hdr_prev) {
	hdr_prev = list_prev(buflist, hdr);

	ASSERT(!HDR_EMPTY(hdr));
	hash_lock = HDR_LOCK(hdr);

	/*
	* We cannot use mutex_enter or else we can deadlock
	* with l2arc_write_buffers (due to swapping the order
	* the hash lock and l2ad_mtx are taken).
	*/
	if (!mutex_tryenter(hash_lock)) {
	/*
	* Missed the hash lock. Retry.
	*/
	ARCSTAT_BUMP(arcstat_l2_evict_lock_retry);
	mutex_exit(&dev->l2ad_mtx);
	mutex_enter(hash_lock);
	mutex_exit(hash_lock);
	goto retry;
	}

	/*
	* A header can't be on this list if it doesn't have L2 header.
	*/
	ASSERT(HDR_HAS_L2HDR(hdr));

	/* Ensure this header has finished being written. */
	ASSERT(!HDR_L2_WRITING(hdr));
	ASSERT(!HDR_L2_WRITE_HEAD(hdr));

	if (!all && (hdr->b_l2hdr.b_daddr >= dev->l2ad_evict \|\|
	hdr->b_l2hdr.b_daddr < dev->l2ad_hand)) {
	/*
	* We've evicted to the target address,
	* or the end of the device.
	*/
	mutex_exit(hash_lock);
	break;
	}

	if (!HDR_HAS_L1HDR(hdr)) {
	ASSERT(!HDR_L2_READING(hdr));
	/*
	* This doesn't exist in the ARC. Destroy.
	* arc_hdr_destroy() will call list_remove()
	* and decrement arcstat_l2_lsize.
	*/
	arc_change_state(arc_anon, hdr, hash_lock);
	arc_hdr_destroy(hdr);
	} else {
	ASSERT(hdr->b_l1hdr.b_state != arc_l2c_only);
	ARCSTAT_BUMP(arcstat_l2_evict_l1cached);
	/*
	* Invalidate issued or about to be issued
	* reads, since we may be about to write
	* over this location.
	*/
	if (HDR_L2_READING(hdr)) {
	ARCSTAT_BUMP(arcstat_l2_evict_reading);
	arc_hdr_set_flags(hdr, ARC_FLAG_L2_EVICTED);
	}

	arc_hdr_l2hdr_destroy(hdr);
	}
	mutex_exit(hash_lock);
	}
	mutex_exit(&dev->l2ad_mtx);

	out:
	/*
	* We need to check if we evict all buffers, otherwise we may iterate
	* unnecessarily.
	*/
	if (!all && rerun) {
	/*
	* Bump device hand to the device start if it is approaching the
	* end. l2arc_evict() has already evicted ahead for this case.
	*/
	dev->l2ad_hand = dev->l2ad_start;
	dev->l2ad_evict = dev->l2ad_start;
	dev->l2ad_first = B_FALSE;
	goto top;
	}

	if (!all) {
	/*
	* In case of cache device removal (all) the following
	* assertions may be violated without functional consequences
	* as the device is about to be removed.
	*/
	ASSERT3U(dev->l2ad_hand + distance, <, dev->l2ad_end);
	if (!dev->l2ad_first)
	ASSERT3U(dev->l2ad_hand, <, dev->l2ad_evict);
	}
	}

	/*
	* Handle any abd transforms that might be required for writing to the L2ARC.
	* If successful, this function will always return an abd with the data
	* transformed as it is on disk in a new abd of asize bytes.
	*/
	static int
	l2arc_apply_transforms(spa_t spa, arc_buf_hdr_t hdr, uint64_t asize,
	abd_t **abd_out)
	{
	int ret;
	void *tmp = NULL;
	abd_t cabd = NULL, eabd = NULL, *to_write = hdr->b_l1hdr.b_pabd;
	enum zio_compress compress = HDR_GET_COMPRESS(hdr);
	uint64_t psize = HDR_GET_PSIZE(hdr);
	uint64_t size = arc_hdr_size(hdr);
	boolean_t ismd = HDR_ISTYPE_METADATA(hdr);
	boolean_t bswap = (hdr->b_l1hdr.b_byteswap != DMU_BSWAP_NUMFUNCS);
	dsl_crypto_key_t *dck = NULL;
	uint8_t mac[ZIO_DATA_MAC_LEN] = { 0 };
	boolean_t no_crypt = B_FALSE;

	ASSERT((HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF &&
	!HDR_COMPRESSION_ENABLED(hdr)) \|\|
	HDR_ENCRYPTED(hdr) \|\| HDR_SHARED_DATA(hdr) \|\| psize != asize);
	ASSERT3U(psize, <=, asize);

	/*
	* If this data simply needs its own buffer, we simply allocate it
	* and copy the data. This may be done to eliminate a dependency on a
	* shared buffer or to reallocate the buffer to match asize.
	*/
	if (HDR_HAS_RABD(hdr) && asize != psize) {
	ASSERT3U(asize, >=, psize);
	to_write = abd_alloc_for_io(asize, ismd);
	abd_copy(to_write, hdr->b_crypt_hdr.b_rabd, psize);
	if (psize != asize)
	abd_zero_off(to_write, psize, asize - psize);
	goto out;
	}

	if ((compress == ZIO_COMPRESS_OFF \|\| HDR_COMPRESSION_ENABLED(hdr)) &&
	!HDR_ENCRYPTED(hdr)) {
	ASSERT3U(size, ==, psize);
	to_write = abd_alloc_for_io(asize, ismd);
	abd_copy(to_write, hdr->b_l1hdr.b_pabd, size);
	if (size != asize)
	abd_zero_off(to_write, size, asize - size);
	goto out;
	}

	if (compress != ZIO_COMPRESS_OFF && !HDR_COMPRESSION_ENABLED(hdr)) {
	cabd = abd_alloc_for_io(asize, ismd);
	tmp = abd_borrow_buf(cabd, asize);

	psize = zio_compress_data(compress, to_write, tmp, size,
	hdr->b_complevel);

	if (psize >= size) {
	abd_return_buf(cabd, tmp, asize);
	HDR_SET_COMPRESS(hdr, ZIO_COMPRESS_OFF);
	to_write = cabd;
	abd_copy(to_write, hdr->b_l1hdr.b_pabd, size);
	if (size != asize)
	abd_zero_off(to_write, size, asize - size);
	goto encrypt;
	}
	ASSERT3U(psize, <=, HDR_GET_PSIZE(hdr));
	if (psize < asize)
	bzero((char *)tmp + psize, asize - psize);
	psize = HDR_GET_PSIZE(hdr);
	abd_return_buf_copy(cabd, tmp, asize);
	to_write = cabd;
	}

	encrypt:
	if (HDR_ENCRYPTED(hdr)) {
	eabd = abd_alloc_for_io(asize, ismd);

	/*
	* If the dataset was disowned before the buffer
	* made it to this point, the key to re-encrypt
	* it won't be available. In this case we simply
	* won't write the buffer to the L2ARC.
	*/
	ret = spa_keystore_lookup_key(spa, hdr->b_crypt_hdr.b_dsobj,
	FTAG, &dck);
	if (ret != 0)
	goto error;

	ret = zio_do_crypt_abd(B_TRUE, &dck->dck_key,
	hdr->b_crypt_hdr.b_ot, bswap, hdr->b_crypt_hdr.b_salt,
	hdr->b_crypt_hdr.b_iv, mac, psize, to_write, eabd,
	&no_crypt);
	if (ret != 0)
	goto error;

	if (no_crypt)
	abd_copy(eabd, to_write, psize);

	if (psize != asize)
	abd_zero_off(eabd, psize, asize - psize);

	/* assert that the MAC we got here matches the one we saved */
	ASSERT0(bcmp(mac, hdr->b_crypt_hdr.b_mac, ZIO_DATA_MAC_LEN));
	spa_keystore_dsl_key_rele(spa, dck, FTAG);

	if (to_write == cabd)
	abd_free(cabd);

	to_write = eabd;
	}

	out:
	ASSERT3P(to_write, !=, hdr->b_l1hdr.b_pabd);
	*abd_out = to_write;
	return (0);

	error:
	if (dck != NULL)
	spa_keystore_dsl_key_rele(spa, dck, FTAG);
	if (cabd != NULL)
	abd_free(cabd);
	if (eabd != NULL)
	abd_free(eabd);

	*abd_out = NULL;
	return (ret);
	}

	static void
	l2arc_blk_fetch_done(zio_t *zio)
	{
	l2arc_read_callback_t *cb;

	cb = zio->io_private;
	if (cb->l2rcb_abd != NULL)
	abd_free(cb->l2rcb_abd);
	kmem_free(cb, sizeof (l2arc_read_callback_t));
	}

	/*
	* Find and write ARC buffers to the L2ARC device.
	*
	* An ARC_FLAG_L2_WRITING flag is set so that the L2ARC buffers are not valid
	* for reading until they have completed writing.
	* The headroom_boost is an in-out parameter used to maintain headroom boost
	* state between calls to this function.
	*
	* Returns the number of bytes actually written (which may be smaller than
	* the delta by which the device hand has changed due to alignment and the
	* writing of log blocks).
	*/
	static uint64_t
	l2arc_write_buffers(spa_t spa, l2arc_dev_t dev, uint64_t target_sz)
	{
	arc_buf_hdr_t hdr, hdr_prev, *head;
	uint64_t write_asize, write_psize, write_lsize, headroom;
	boolean_t full;
	l2arc_write_callback_t *cb = NULL;
	zio_t pio, wzio;
	uint64_t guid = spa_load_guid(spa);
	l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr;

	ASSERT3P(dev->l2ad_vdev, !=, NULL);

	pio = NULL;
	write_lsize = write_asize = write_psize = 0;
	full = B_FALSE;
	head = kmem_cache_alloc(hdr_l2only_cache, KM_PUSHPAGE);
	arc_hdr_set_flags(head, ARC_FLAG_L2_WRITE_HEAD \| ARC_FLAG_HAS_L2HDR);

	/*
	* Copy buffers for L2ARC writing.
	*/
	for (int pass = 0; pass < L2ARC_FEED_TYPES; pass++) {
	/*
	* If pass == 1 or 3, we cache MRU metadata and data
	* respectively.
	*/
	if (l2arc_mfuonly) {
	if (pass == 1 \|\| pass == 3)
	continue;
	}

	multilist_sublist_t *mls = l2arc_sublist_lock(pass);
	uint64_t passed_sz = 0;

	VERIFY3P(mls, !=, NULL);

	/*
	* L2ARC fast warmup.
	*
	* Until the ARC is warm and starts to evict, read from the
	* head of the ARC lists rather than the tail.
	*/
	if (arc_warm == B_FALSE)
	hdr = multilist_sublist_head(mls);
	else
	hdr = multilist_sublist_tail(mls);

	headroom = target_sz * l2arc_headroom;
	if (zfs_compressed_arc_enabled)
	headroom = (headroom * l2arc_headroom_boost) / 100;

	for (; hdr; hdr = hdr_prev) {
	kmutex_t *hash_lock;
	abd_t *to_write = NULL;

	if (arc_warm == B_FALSE)
	hdr_prev = multilist_sublist_next(mls, hdr);
	else
	hdr_prev = multilist_sublist_prev(mls, hdr);

	hash_lock = HDR_LOCK(hdr);
	if (!mutex_tryenter(hash_lock)) {
	/*
	* Skip this buffer rather than waiting.
	*/
	continue;
	}

	passed_sz += HDR_GET_LSIZE(hdr);
	if (l2arc_headroom != 0 && passed_sz > headroom) {
	/*
	* Searched too far.
	*/
	mutex_exit(hash_lock);
	break;
	}

	if (!l2arc_write_eligible(guid, hdr)) {
	mutex_exit(hash_lock);
	continue;
	}

	/*
	* We rely on the L1 portion of the header below, so
	* it's invalid for this header to have been evicted out
	* of the ghost cache, prior to being written out. The
	* ARC_FLAG_L2_WRITING bit ensures this won't happen.
	*/
	ASSERT(HDR_HAS_L1HDR(hdr));

	ASSERT3U(HDR_GET_PSIZE(hdr), >, 0);
	ASSERT3U(arc_hdr_size(hdr), >, 0);
	ASSERT(hdr->b_l1hdr.b_pabd != NULL \|\|
	HDR_HAS_RABD(hdr));
	uint64_t psize = HDR_GET_PSIZE(hdr);
	uint64_t asize = vdev_psize_to_asize(dev->l2ad_vdev,
	psize);

	if ((write_asize + asize) > target_sz) {
	full = B_TRUE;
	mutex_exit(hash_lock);
	break;
	}

	/*
	* We rely on the L1 portion of the header below, so
	* it's invalid for this header to have been evicted out
	* of the ghost cache, prior to being written out. The
	* ARC_FLAG_L2_WRITING bit ensures this won't happen.
	*/
	arc_hdr_set_flags(hdr, ARC_FLAG_L2_WRITING);
	ASSERT(HDR_HAS_L1HDR(hdr));

	ASSERT3U(HDR_GET_PSIZE(hdr), >, 0);
	ASSERT(hdr->b_l1hdr.b_pabd != NULL \|\|
	HDR_HAS_RABD(hdr));
	ASSERT3U(arc_hdr_size(hdr), >, 0);

	/*
	* If this header has b_rabd, we can use this since it
	* must always match the data exactly as it exists on
	* disk. Otherwise, the L2ARC can normally use the
	* hdr's data, but if we're sharing data between the
	* hdr and one of its bufs, L2ARC needs its own copy of
	* the data so that the ZIO below can't race with the
	* buf consumer. To ensure that this copy will be
	* available for the lifetime of the ZIO and be cleaned
	* up afterwards, we add it to the l2arc_free_on_write
	* queue. If we need to apply any transforms to the
	* data (compression, encryption) we will also need the
	* extra buffer.
	*/
	if (HDR_HAS_RABD(hdr) && psize == asize) {
	to_write = hdr->b_crypt_hdr.b_rabd;
	} else if ((HDR_COMPRESSION_ENABLED(hdr) \|\|
	HDR_GET_COMPRESS(hdr) == ZIO_COMPRESS_OFF) &&
	!HDR_ENCRYPTED(hdr) && !HDR_SHARED_DATA(hdr) &&
	psize == asize) {
	to_write = hdr->b_l1hdr.b_pabd;
	} else {
	int ret;
	arc_buf_contents_t type = arc_buf_type(hdr);

	ret = l2arc_apply_transforms(spa, hdr, asize,
	&to_write);
	if (ret != 0) {
	arc_hdr_clear_flags(hdr,
	ARC_FLAG_L2_WRITING);
	mutex_exit(hash_lock);
	continue;
	}

	l2arc_free_abd_on_write(to_write, asize, type);
	}

	if (pio == NULL) {
	/*
	* Insert a dummy header on the buflist so
	* l2arc_write_done() can find where the
	* write buffers begin without searching.
	*/
	mutex_enter(&dev->l2ad_mtx);
	list_insert_head(&dev->l2ad_buflist, head);
	mutex_exit(&dev->l2ad_mtx);

	cb = kmem_alloc(
	sizeof (l2arc_write_callback_t), KM_SLEEP);
	cb->l2wcb_dev = dev;
	cb->l2wcb_head = head;
	/*
	* Create a list to save allocated abd buffers
	* for l2arc_log_blk_commit().
	*/
	list_create(&cb->l2wcb_abd_list,
	sizeof (l2arc_lb_abd_buf_t),
	offsetof(l2arc_lb_abd_buf_t, node));
	pio = zio_root(spa, l2arc_write_done, cb,
	ZIO_FLAG_CANFAIL);
	}

	hdr->b_l2hdr.b_dev = dev;
	hdr->b_l2hdr.b_hits = 0;

	hdr->b_l2hdr.b_daddr = dev->l2ad_hand;
	hdr->b_l2hdr.b_arcs_state =
	hdr->b_l1hdr.b_state->arcs_state;
	arc_hdr_set_flags(hdr, ARC_FLAG_HAS_L2HDR);

	mutex_enter(&dev->l2ad_mtx);
	list_insert_head(&dev->l2ad_buflist, hdr);
	mutex_exit(&dev->l2ad_mtx);

	(void) zfs_refcount_add_many(&dev->l2ad_alloc,
	arc_hdr_size(hdr), hdr);

	wzio = zio_write_phys(pio, dev->l2ad_vdev,
	hdr->b_l2hdr.b_daddr, asize, to_write,
	ZIO_CHECKSUM_OFF, NULL, hdr,
	ZIO_PRIORITY_ASYNC_WRITE,
	ZIO_FLAG_CANFAIL, B_FALSE);

	write_lsize += HDR_GET_LSIZE(hdr);
	DTRACE_PROBE2(l2arc__write, vdev_t *, dev->l2ad_vdev,
	zio_t *, wzio);

	write_psize += psize;
	write_asize += asize;
	dev->l2ad_hand += asize;
	l2arc_hdr_arcstats_increment(hdr);
	vdev_space_update(dev->l2ad_vdev, asize, 0, 0);

	mutex_exit(hash_lock);

	/*
	* Append buf info to current log and commit if full.
	* arcstat_l2_{size,asize} kstats are updated
	* internally.
	*/
	if (l2arc_log_blk_insert(dev, hdr))
	l2arc_log_blk_commit(dev, pio, cb);

	zio_nowait(wzio);
	}

	multilist_sublist_unlock(mls);

	if (full == B_TRUE)
	break;
	}

	/* No buffers selected for writing? */
	if (pio == NULL) {
	ASSERT0(write_lsize);
	ASSERT(!HDR_HAS_L1HDR(head));
	kmem_cache_free(hdr_l2only_cache, head);

	/*
	* Although we did not write any buffers l2ad_evict may
	* have advanced.
	*/
	if (dev->l2ad_evict != l2dhdr->dh_evict)
	l2arc_dev_hdr_update(dev);

	return (0);
	}

	if (!dev->l2ad_first)
	ASSERT3U(dev->l2ad_hand, <=, dev->l2ad_evict);

	ASSERT3U(write_asize, <=, target_sz);
	ARCSTAT_BUMP(arcstat_l2_writes_sent);
	ARCSTAT_INCR(arcstat_l2_write_bytes, write_psize);

	dev->l2ad_writing = B_TRUE;
	(void) zio_wait(pio);
	dev->l2ad_writing = B_FALSE;

	/*
	* Update the device header after the zio completes as
	* l2arc_write_done() may have updated the memory holding the log block
	* pointers in the device header.
	*/
	l2arc_dev_hdr_update(dev);

	return (write_asize);
	}

	static boolean_t
	l2arc_hdr_limit_reached(void)
	{
	int64_t s = aggsum_upper_bound(&arc_sums.arcstat_l2_hdr_size);

	return (arc_reclaim_needed() \|\| (s > arc_meta_limit * 3 / 4) \|\|
	(s > (arc_warm ? arc_c : arc_c_max) * l2arc_meta_percent / 100));
	}

	/*
	* This thread feeds the L2ARC at regular intervals. This is the beating
	* heart of the L2ARC.
	*/
	/* ARGSUSED */
	static void
	l2arc_feed_thread(void *unused)
	{
	callb_cpr_t cpr;
	l2arc_dev_t *dev;
	spa_t *spa;
	uint64_t size, wrote;
	clock_t begin, next = ddi_get_lbolt();
	fstrans_cookie_t cookie;

	CALLB_CPR_INIT(&cpr, &l2arc_feed_thr_lock, callb_generic_cpr, FTAG);

	mutex_enter(&l2arc_feed_thr_lock);

	cookie = spl_fstrans_mark();
	while (l2arc_thread_exit == 0) {
	CALLB_CPR_SAFE_BEGIN(&cpr);
	(void) cv_timedwait_idle(&l2arc_feed_thr_cv,
	&l2arc_feed_thr_lock, next);
	CALLB_CPR_SAFE_END(&cpr, &l2arc_feed_thr_lock);
	next = ddi_get_lbolt() + hz;

	/*
	* Quick check for L2ARC devices.
	*/
	mutex_enter(&l2arc_dev_mtx);
	if (l2arc_ndev == 0) {
	mutex_exit(&l2arc_dev_mtx);
	continue;
	}
	mutex_exit(&l2arc_dev_mtx);
	begin = ddi_get_lbolt();

	/*
	* This selects the next l2arc device to write to, and in
	* doing so the next spa to feed from: dev->l2ad_spa. This
	* will return NULL if there are now no l2arc devices or if
	* they are all faulted.
	*
	* If a device is returned, its spa's config lock is also
	* held to prevent device removal. l2arc_dev_get_next()
	* will grab and release l2arc_dev_mtx.
	*/
	if ((dev = l2arc_dev_get_next()) == NULL)
	continue;

	spa = dev->l2ad_spa;
	ASSERT3P(spa, !=, NULL);

	/*
	* If the pool is read-only then force the feed thread to
	* sleep a little longer.
	*/
	if (!spa_writeable(spa)) {
	next = ddi_get_lbolt() + 5 * l2arc_feed_secs * hz;
	spa_config_exit(spa, SCL_L2ARC, dev);
	continue;
	}

	/*
	* Avoid contributing to memory pressure.
	*/
	if (l2arc_hdr_limit_reached()) {
	ARCSTAT_BUMP(arcstat_l2_abort_lowmem);
	spa_config_exit(spa, SCL_L2ARC, dev);
	continue;
	}

	ARCSTAT_BUMP(arcstat_l2_feeds);

	size = l2arc_write_size(dev);

	/*
	* Evict L2ARC buffers that will be overwritten.
	*/
	l2arc_evict(dev, size, B_FALSE);

	/*
	* Write ARC buffers.
	*/
	wrote = l2arc_write_buffers(spa, dev, size);

	/*
	* Calculate interval between writes.
	*/
	next = l2arc_write_interval(begin, size, wrote);
	spa_config_exit(spa, SCL_L2ARC, dev);
	}
	spl_fstrans_unmark(cookie);

	l2arc_thread_exit = 0;
	cv_broadcast(&l2arc_feed_thr_cv);
	CALLB_CPR_EXIT(&cpr); /* drops l2arc_feed_thr_lock */
	thread_exit();
	}

	boolean_t
	l2arc_vdev_present(vdev_t *vd)
	{
	return (l2arc_vdev_get(vd) != NULL);
	}

	/*
	* Returns the l2arc_dev_t associated with a particular vdev_t or NULL if
	* the vdev_t isn't an L2ARC device.
	*/
	l2arc_dev_t *
	l2arc_vdev_get(vdev_t *vd)
	{
	l2arc_dev_t *dev;

	mutex_enter(&l2arc_dev_mtx);
	for (dev = list_head(l2arc_dev_list); dev != NULL;
	dev = list_next(l2arc_dev_list, dev)) {
	if (dev->l2ad_vdev == vd)
	break;
	}
	mutex_exit(&l2arc_dev_mtx);

	return (dev);
	}

	+static void
	+l2arc_rebuild_dev(l2arc_dev_t *dev, boolean_t reopen)
	+{
	+ l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr;
	+ uint64_t l2dhdr_asize = dev->l2ad_dev_hdr_asize;
	+ spa_t *spa = dev->l2ad_spa;
	+
	+ /*
	+ * The L2ARC has to hold at least the payload of one log block for
	+ * them to be restored (persistent L2ARC). The payload of a log block
	+ * depends on the amount of its log entries. We always write log blocks
	+ * with 1022 entries. How many of them are committed or restored depends
	+ * on the size of the L2ARC device. Thus the maximum payload of
	+ * one log block is 1022 * SPA_MAXBLOCKSIZE = 16GB. If the L2ARC device
	+ * is less than that, we reduce the amount of committed and restored
	+ * log entries per block so as to enable persistence.
	+ */
	+ if (dev->l2ad_end < l2arc_rebuild_blocks_min_l2size) {
	+ dev->l2ad_log_entries = 0;
	+ } else {
	+ dev->l2ad_log_entries = MIN((dev->l2ad_end -
	+ dev->l2ad_start) >> SPA_MAXBLOCKSHIFT,
	+ L2ARC_LOG_BLK_MAX_ENTRIES);
	+ }
	+
	+ /*
	+ * Read the device header, if an error is returned do not rebuild L2ARC.
	+ */
	+ if (l2arc_dev_hdr_read(dev) == 0 && dev->l2ad_log_entries > 0) {
	+ /*
	+ * If we are onlining a cache device (vdev_reopen) that was
	+ * still present (l2arc_vdev_present()) and rebuild is enabled,
	+ * we should evict all ARC buffers and pointers to log blocks
	+ * and reclaim their space before restoring its contents to
	+ * L2ARC.
	+ */
	+ if (reopen) {
	+ if (!l2arc_rebuild_enabled) {
	+ return;
	+ } else {
	+ l2arc_evict(dev, 0, B_TRUE);
	+ /* start a new log block */
	+ dev->l2ad_log_ent_idx = 0;
	+ dev->l2ad_log_blk_payload_asize = 0;
	+ dev->l2ad_log_blk_payload_start = 0;
	+ }
	+ }
	+ /*
	+ * Just mark the device as pending for a rebuild. We won't
	+ * be starting a rebuild in line here as it would block pool
	+ * import. Instead spa_load_impl will hand that off to an
	+ * async task which will call l2arc_spa_rebuild_start.
	+ */
	+ dev->l2ad_rebuild = B_TRUE;
	+ } else if (spa_writeable(spa)) {
	+ /*
	+ * In this case TRIM the whole device if l2arc_trim_ahead > 0,
	+ * otherwise create a new header. We zero out the memory holding
	+ * the header to reset dh_start_lbps. If we TRIM the whole
	+ * device the new header will be written by
	+ * vdev_trim_l2arc_thread() at the end of the TRIM to update the
	+ * trim_state in the header too. When reading the header, if
	+ * trim_state is not VDEV_TRIM_COMPLETE and l2arc_trim_ahead > 0
	+ * we opt to TRIM the whole device again.
	+ */
	+ if (l2arc_trim_ahead > 0) {
	+ dev->l2ad_trim_all = B_TRUE;
	+ } else {
	+ bzero(l2dhdr, l2dhdr_asize);
	+ l2arc_dev_hdr_update(dev);
	+ }
	+ }
	+}
	+
	/*
	* Add a vdev for use by the L2ARC. By this point the spa has already
	* validated the vdev and opened it.
	*/
	void
	l2arc_add_vdev(spa_t spa, vdev_t vd)
	{
	l2arc_dev_t *adddev;
	uint64_t l2dhdr_asize;

	ASSERT(!l2arc_vdev_present(vd));

	/*
	* Create a new l2arc device entry.
	*/
	adddev = vmem_zalloc(sizeof (l2arc_dev_t), KM_SLEEP);
	adddev->l2ad_spa = spa;
	adddev->l2ad_vdev = vd;
	/* leave extra size for an l2arc device header */
	l2dhdr_asize = adddev->l2ad_dev_hdr_asize =
	MAX(sizeof (*adddev->l2ad_dev_hdr), 1 << vd->vdev_ashift);
	adddev->l2ad_start = VDEV_LABEL_START_SIZE + l2dhdr_asize;
	adddev->l2ad_end = VDEV_LABEL_START_SIZE + vdev_get_min_asize(vd);
	ASSERT3U(adddev->l2ad_start, <, adddev->l2ad_end);
	adddev->l2ad_hand = adddev->l2ad_start;
	adddev->l2ad_evict = adddev->l2ad_start;
	adddev->l2ad_first = B_TRUE;
	adddev->l2ad_writing = B_FALSE;
	adddev->l2ad_trim_all = B_FALSE;
	list_link_init(&adddev->l2ad_node);
	adddev->l2ad_dev_hdr = kmem_zalloc(l2dhdr_asize, KM_SLEEP);

	mutex_init(&adddev->l2ad_mtx, NULL, MUTEX_DEFAULT, NULL);
	/*
	* This is a list of all ARC buffers that are still valid on the
	* device.
	*/
	list_create(&adddev->l2ad_buflist, sizeof (arc_buf_hdr_t),
	offsetof(arc_buf_hdr_t, b_l2hdr.b_l2node));

	/*
	* This is a list of pointers to log blocks that are still present
	* on the device.
	*/
	list_create(&adddev->l2ad_lbptr_list, sizeof (l2arc_lb_ptr_buf_t),
	offsetof(l2arc_lb_ptr_buf_t, node));

	vdev_space_update(vd, 0, 0, adddev->l2ad_end - adddev->l2ad_hand);
	zfs_refcount_create(&adddev->l2ad_alloc);
	zfs_refcount_create(&adddev->l2ad_lb_asize);
	zfs_refcount_create(&adddev->l2ad_lb_count);

	+ /*
	+ * Decide if dev is eligible for L2ARC rebuild or whole device
	+ * trimming. This has to happen before the device is added in the
	+ * cache device list and l2arc_dev_mtx is released. Otherwise
	+ * l2arc_feed_thread() might already start writing on the
	+ * device.
	+ */
	+ l2arc_rebuild_dev(adddev, B_FALSE);
	+
	/*
	* Add device to global list
	*/
	mutex_enter(&l2arc_dev_mtx);
	list_insert_head(l2arc_dev_list, adddev);
	atomic_inc_64(&l2arc_ndev);
	mutex_exit(&l2arc_dev_mtx);
	-
	- /*
	- * Decide if vdev is eligible for L2ARC rebuild
	- */
	- l2arc_rebuild_vdev(adddev->l2ad_vdev, B_FALSE);
	}

	+/*
	+ * Decide if a vdev is eligible for L2ARC rebuild, called from vdev_reopen()
	+ * in case of onlining a cache device.
	+ */
	void
	l2arc_rebuild_vdev(vdev_t *vd, boolean_t reopen)
	{
	l2arc_dev_t *dev = NULL;
	- l2arc_dev_hdr_phys_t *l2dhdr;
	- uint64_t l2dhdr_asize;
	- spa_t *spa;

	dev = l2arc_vdev_get(vd);
	ASSERT3P(dev, !=, NULL);
	- spa = dev->l2ad_spa;
	- l2dhdr = dev->l2ad_dev_hdr;
	- l2dhdr_asize = dev->l2ad_dev_hdr_asize;

	/*
	- * The L2ARC has to hold at least the payload of one log block for
	- * them to be restored (persistent L2ARC). The payload of a log block
	- * depends on the amount of its log entries. We always write log blocks
	- * with 1022 entries. How many of them are committed or restored depends
	- * on the size of the L2ARC device. Thus the maximum payload of
	- * one log block is 1022 * SPA_MAXBLOCKSIZE = 16GB. If the L2ARC device
	- * is less than that, we reduce the amount of committed and restored
	- * log entries per block so as to enable persistence.
	+ * In contrast to l2arc_add_vdev() we do not have to worry about
	+ * l2arc_feed_thread() invalidating previous content when onlining a
	+ * cache device. The device parameters (l2ad*) are not cleared when
	+ * offlining the device and writing new buffers will not invalidate
	+ * all previous content. In worst case only buffers that have not had
	+ * their log block written to the device will be lost.
	+ * When onlining the cache device (ie offline->online without exporting
	+ * the pool in between) this happens:
	+ * vdev_reopen() -> vdev_open() -> l2arc_rebuild_vdev()
	+ * \| \|
	+ * vdev_is_dead() = B_FALSE l2ad_rebuild = B_TRUE
	+ * During the time where vdev_is_dead = B_FALSE and until l2ad_rebuild
	+ * is set to B_TRUE we might write additional buffers to the device.
	*/
	- if (dev->l2ad_end < l2arc_rebuild_blocks_min_l2size) {
	- dev->l2ad_log_entries = 0;
	- } else {
	- dev->l2ad_log_entries = MIN((dev->l2ad_end -
	- dev->l2ad_start) >> SPA_MAXBLOCKSHIFT,
	- L2ARC_LOG_BLK_MAX_ENTRIES);
	- }
	-
	- /*
	- * Read the device header, if an error is returned do not rebuild L2ARC.
	- */
	- if (l2arc_dev_hdr_read(dev) == 0 && dev->l2ad_log_entries > 0) {
	- /*
	- * If we are onlining a cache device (vdev_reopen) that was
	- * still present (l2arc_vdev_present()) and rebuild is enabled,
	- * we should evict all ARC buffers and pointers to log blocks
	- * and reclaim their space before restoring its contents to
	- * L2ARC.
	- */
	- if (reopen) {
	- if (!l2arc_rebuild_enabled) {
	- return;
	- } else {
	- l2arc_evict(dev, 0, B_TRUE);
	- /* start a new log block */
	- dev->l2ad_log_ent_idx = 0;
	- dev->l2ad_log_blk_payload_asize = 0;
	- dev->l2ad_log_blk_payload_start = 0;
	- }
	- }
	- /*
	- * Just mark the device as pending for a rebuild. We won't
	- * be starting a rebuild in line here as it would block pool
	- * import. Instead spa_load_impl will hand that off to an
	- * async task which will call l2arc_spa_rebuild_start.
	- */
	- dev->l2ad_rebuild = B_TRUE;
	- } else if (spa_writeable(spa)) {
	- /*
	- * In this case TRIM the whole device if l2arc_trim_ahead > 0,
	- * otherwise create a new header. We zero out the memory holding
	- * the header to reset dh_start_lbps. If we TRIM the whole
	- * device the new header will be written by
	- * vdev_trim_l2arc_thread() at the end of the TRIM to update the
	- * trim_state in the header too. When reading the header, if
	- * trim_state is not VDEV_TRIM_COMPLETE and l2arc_trim_ahead > 0
	- * we opt to TRIM the whole device again.
	- */
	- if (l2arc_trim_ahead > 0) {
	- dev->l2ad_trim_all = B_TRUE;
	- } else {
	- bzero(l2dhdr, l2dhdr_asize);
	- l2arc_dev_hdr_update(dev);
	- }
	- }
	+ l2arc_rebuild_dev(dev, reopen);
	}

	/*
	* Remove a vdev from the L2ARC.
	*/
	void
	l2arc_remove_vdev(vdev_t *vd)
	{
	l2arc_dev_t *remdev = NULL;

	/*
	* Find the device by vdev
	*/
	remdev = l2arc_vdev_get(vd);
	ASSERT3P(remdev, !=, NULL);

	/*
	* Cancel any ongoing or scheduled rebuild.
	*/
	mutex_enter(&l2arc_rebuild_thr_lock);
	if (remdev->l2ad_rebuild_began == B_TRUE) {
	remdev->l2ad_rebuild_cancel = B_TRUE;
	while (remdev->l2ad_rebuild == B_TRUE)
	cv_wait(&l2arc_rebuild_thr_cv, &l2arc_rebuild_thr_lock);
	}
	mutex_exit(&l2arc_rebuild_thr_lock);

	/*
	* Remove device from global list
	*/
	mutex_enter(&l2arc_dev_mtx);
	list_remove(l2arc_dev_list, remdev);
	l2arc_dev_last = NULL; /* may have been invalidated */
	atomic_dec_64(&l2arc_ndev);
	mutex_exit(&l2arc_dev_mtx);

	/*
	* Clear all buflists and ARC references. L2ARC device flush.
	*/
	l2arc_evict(remdev, 0, B_TRUE);
	list_destroy(&remdev->l2ad_buflist);
	ASSERT(list_is_empty(&remdev->l2ad_lbptr_list));
	list_destroy(&remdev->l2ad_lbptr_list);
	mutex_destroy(&remdev->l2ad_mtx);
	zfs_refcount_destroy(&remdev->l2ad_alloc);
	zfs_refcount_destroy(&remdev->l2ad_lb_asize);
	zfs_refcount_destroy(&remdev->l2ad_lb_count);
	kmem_free(remdev->l2ad_dev_hdr, remdev->l2ad_dev_hdr_asize);
	vmem_free(remdev, sizeof (l2arc_dev_t));
	}

	void
	l2arc_init(void)
	{
	l2arc_thread_exit = 0;
	l2arc_ndev = 0;

	mutex_init(&l2arc_feed_thr_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&l2arc_feed_thr_cv, NULL, CV_DEFAULT, NULL);
	mutex_init(&l2arc_rebuild_thr_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&l2arc_rebuild_thr_cv, NULL, CV_DEFAULT, NULL);
	mutex_init(&l2arc_dev_mtx, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&l2arc_free_on_write_mtx, NULL, MUTEX_DEFAULT, NULL);

	l2arc_dev_list = &L2ARC_dev_list;
	l2arc_free_on_write = &L2ARC_free_on_write;
	list_create(l2arc_dev_list, sizeof (l2arc_dev_t),
	offsetof(l2arc_dev_t, l2ad_node));
	list_create(l2arc_free_on_write, sizeof (l2arc_data_free_t),
	offsetof(l2arc_data_free_t, l2df_list_node));
	}

	void
	l2arc_fini(void)
	{
	mutex_destroy(&l2arc_feed_thr_lock);
	cv_destroy(&l2arc_feed_thr_cv);
	mutex_destroy(&l2arc_rebuild_thr_lock);
	cv_destroy(&l2arc_rebuild_thr_cv);
	mutex_destroy(&l2arc_dev_mtx);
	mutex_destroy(&l2arc_free_on_write_mtx);

	list_destroy(l2arc_dev_list);
	list_destroy(l2arc_free_on_write);
	}

	void
	l2arc_start(void)
	{
	if (!(spa_mode_global & SPA_MODE_WRITE))
	return;

	(void) thread_create(NULL, 0, l2arc_feed_thread, NULL, 0, &p0,
	TS_RUN, defclsyspri);
	}

	void
	l2arc_stop(void)
	{
	if (!(spa_mode_global & SPA_MODE_WRITE))
	return;

	mutex_enter(&l2arc_feed_thr_lock);
	cv_signal(&l2arc_feed_thr_cv); /* kick thread out of startup */
	l2arc_thread_exit = 1;
	while (l2arc_thread_exit != 0)
	cv_wait(&l2arc_feed_thr_cv, &l2arc_feed_thr_lock);
	mutex_exit(&l2arc_feed_thr_lock);
	}

	/*
	* Punches out rebuild threads for the L2ARC devices in a spa. This should
	* be called after pool import from the spa async thread, since starting
	* these threads directly from spa_import() will make them part of the
	* "zpool import" context and delay process exit (and thus pool import).
	*/
	void
	l2arc_spa_rebuild_start(spa_t *spa)
	{
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	/*
	* Locate the spa's l2arc devices and kick off rebuild threads.
	*/
	for (int i = 0; i < spa->spa_l2cache.sav_count; i++) {
	l2arc_dev_t *dev =
	l2arc_vdev_get(spa->spa_l2cache.sav_vdevs[i]);
	if (dev == NULL) {
	/* Don't attempt a rebuild if the vdev is UNAVAIL */
	continue;
	}
	mutex_enter(&l2arc_rebuild_thr_lock);
	if (dev->l2ad_rebuild && !dev->l2ad_rebuild_cancel) {
	dev->l2ad_rebuild_began = B_TRUE;
	(void) thread_create(NULL, 0, l2arc_dev_rebuild_thread,
	dev, 0, &p0, TS_RUN, minclsyspri);
	}
	mutex_exit(&l2arc_rebuild_thr_lock);
	}
	}

	/*
	* Main entry point for L2ARC rebuilding.
	*/
	static void
	l2arc_dev_rebuild_thread(void *arg)
	{
	l2arc_dev_t *dev = arg;

	VERIFY(!dev->l2ad_rebuild_cancel);
	VERIFY(dev->l2ad_rebuild);
	(void) l2arc_rebuild(dev);
	mutex_enter(&l2arc_rebuild_thr_lock);
	dev->l2ad_rebuild_began = B_FALSE;
	dev->l2ad_rebuild = B_FALSE;
	mutex_exit(&l2arc_rebuild_thr_lock);

	thread_exit();
	}

	/*
	* This function implements the actual L2ARC metadata rebuild. It:
	* starts reading the log block chain and restores each block's contents
	* to memory (reconstructing arc_buf_hdr_t's).
	*
	* Operation stops under any of the following conditions:
	*
	* 1) We reach the end of the log block chain.
	* 2) We encounter any error condition (cksum errors, io errors)
	*/
	static int
	l2arc_rebuild(l2arc_dev_t *dev)
	{
	vdev_t *vd = dev->l2ad_vdev;
	spa_t *spa = vd->vdev_spa;
	int err = 0;
	l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr;
	l2arc_log_blk_phys_t this_lb, next_lb;
	zio_t this_io = NULL, next_io = NULL;
	l2arc_log_blkptr_t lbps[2];
	l2arc_lb_ptr_buf_t *lb_ptr_buf;
	boolean_t lock_held;

	this_lb = vmem_zalloc(sizeof (*this_lb), KM_SLEEP);
	next_lb = vmem_zalloc(sizeof (*next_lb), KM_SLEEP);

	/*
	* We prevent device removal while issuing reads to the device,
	* then during the rebuilding phases we drop this lock again so
	* that a spa_unload or device remove can be initiated - this is
	* safe, because the spa will signal us to stop before removing
	* our device and wait for us to stop.
	*/
	spa_config_enter(spa, SCL_L2ARC, vd, RW_READER);
	lock_held = B_TRUE;

	/*
	* Retrieve the persistent L2ARC device state.
	* L2BLK_GET_PSIZE returns aligned size for log blocks.
	*/
	dev->l2ad_evict = MAX(l2dhdr->dh_evict, dev->l2ad_start);
	dev->l2ad_hand = MAX(l2dhdr->dh_start_lbps[0].lbp_daddr +
	L2BLK_GET_PSIZE((&l2dhdr->dh_start_lbps[0])->lbp_prop),
	dev->l2ad_start);
	dev->l2ad_first = !!(l2dhdr->dh_flags & L2ARC_DEV_HDR_EVICT_FIRST);

	vd->vdev_trim_action_time = l2dhdr->dh_trim_action_time;
	vd->vdev_trim_state = l2dhdr->dh_trim_state;

	/*
	* In case the zfs module parameter l2arc_rebuild_enabled is false
	* we do not start the rebuild process.
	*/
	if (!l2arc_rebuild_enabled)
	goto out;

	/* Prepare the rebuild process */
	bcopy(l2dhdr->dh_start_lbps, lbps, sizeof (lbps));

	/* Start the rebuild process */
	for (;;) {
	if (!l2arc_log_blkptr_valid(dev, &lbps[0]))
	break;

	if ((err = l2arc_log_blk_read(dev, &lbps[0], &lbps[1],
	this_lb, next_lb, this_io, &next_io)) != 0)
	goto out;

	/*
	* Our memory pressure valve. If the system is running low
	* on memory, rather than swamping memory with new ARC buf
	* hdrs, we opt not to rebuild the L2ARC. At this point,
	* however, we have already set up our L2ARC dev to chain in
	* new metadata log blocks, so the user may choose to offline/
	* online the L2ARC dev at a later time (or re-import the pool)
	* to reconstruct it (when there's less memory pressure).
	*/
	if (l2arc_hdr_limit_reached()) {
	ARCSTAT_BUMP(arcstat_l2_rebuild_abort_lowmem);
	cmn_err(CE_NOTE, "System running low on memory, "
	"aborting L2ARC rebuild.");
	err = SET_ERROR(ENOMEM);
	goto out;
	}

	spa_config_exit(spa, SCL_L2ARC, vd);
	lock_held = B_FALSE;

	/*
	* Now that we know that the next_lb checks out alright, we
	* can start reconstruction from this log block.
	* L2BLK_GET_PSIZE returns aligned size for log blocks.
	*/
	uint64_t asize = L2BLK_GET_PSIZE((&lbps[0])->lbp_prop);
	l2arc_log_blk_restore(dev, this_lb, asize);

	/*
	* log block restored, include its pointer in the list of
	* pointers to log blocks present in the L2ARC device.
	*/
	lb_ptr_buf = kmem_zalloc(sizeof (l2arc_lb_ptr_buf_t), KM_SLEEP);
	lb_ptr_buf->lb_ptr = kmem_zalloc(sizeof (l2arc_log_blkptr_t),
	KM_SLEEP);
	bcopy(&lbps[0], lb_ptr_buf->lb_ptr,
	sizeof (l2arc_log_blkptr_t));
	mutex_enter(&dev->l2ad_mtx);
	list_insert_tail(&dev->l2ad_lbptr_list, lb_ptr_buf);
	ARCSTAT_INCR(arcstat_l2_log_blk_asize, asize);
	ARCSTAT_BUMP(arcstat_l2_log_blk_count);
	zfs_refcount_add_many(&dev->l2ad_lb_asize, asize, lb_ptr_buf);
	zfs_refcount_add(&dev->l2ad_lb_count, lb_ptr_buf);
	mutex_exit(&dev->l2ad_mtx);
	vdev_space_update(vd, asize, 0, 0);

	/*
	* Protection against loops of log blocks:
	*
	* l2ad_hand l2ad_evict
	* V V
	* l2ad_start \|=======================================\| l2ad_end
	* -----\|\|\|----\|\|\|---\|\|\|----\|\|\|
	* (3) (2) (1) (0)
	* ---\|\|\|---\|\|\|----\|\|\|---\|\|\|
	* (7) (6) (5) (4)
	*
	* In this situation the pointer of log block (4) passes
	* l2arc_log_blkptr_valid() but the log block should not be
	* restored as it is overwritten by the payload of log block
	* (0). Only log blocks (0)-(3) should be restored. We check
	* whether l2ad_evict lies in between the payload starting
	* offset of the next log block (lbps[1].lbp_payload_start)
	* and the payload starting offset of the present log block
	* (lbps[0].lbp_payload_start). If true and this isn't the
	* first pass, we are looping from the beginning and we should
	* stop.
	*/
	if (l2arc_range_check_overlap(lbps[1].lbp_payload_start,
	lbps[0].lbp_payload_start, dev->l2ad_evict) &&
	!dev->l2ad_first)
	goto out;

	cond_resched();
	for (;;) {
	mutex_enter(&l2arc_rebuild_thr_lock);
	if (dev->l2ad_rebuild_cancel) {
	dev->l2ad_rebuild = B_FALSE;
	cv_signal(&l2arc_rebuild_thr_cv);
	mutex_exit(&l2arc_rebuild_thr_lock);
	err = SET_ERROR(ECANCELED);
	goto out;
	}
	mutex_exit(&l2arc_rebuild_thr_lock);
	if (spa_config_tryenter(spa, SCL_L2ARC, vd,
	RW_READER)) {
	lock_held = B_TRUE;
	break;
	}
	/*
	* L2ARC config lock held by somebody in writer,
	* possibly due to them trying to remove us. They'll
	* likely to want us to shut down, so after a little
	* delay, we check l2ad_rebuild_cancel and retry
	* the lock again.
	*/
	delay(1);
	}

	/*
	* Continue with the next log block.
	*/
	lbps[0] = lbps[1];
	lbps[1] = this_lb->lb_prev_lbp;
	PTR_SWAP(this_lb, next_lb);
	this_io = next_io;
	next_io = NULL;
	}

	if (this_io != NULL)
	l2arc_log_blk_fetch_abort(this_io);
	out:
	if (next_io != NULL)
	l2arc_log_blk_fetch_abort(next_io);
	vmem_free(this_lb, sizeof (*this_lb));
	vmem_free(next_lb, sizeof (*next_lb));

	if (!l2arc_rebuild_enabled) {
	spa_history_log_internal(spa, "L2ARC rebuild", NULL,
	"disabled");
	} else if (err == 0 && zfs_refcount_count(&dev->l2ad_lb_count) > 0) {
	ARCSTAT_BUMP(arcstat_l2_rebuild_success);
	spa_history_log_internal(spa, "L2ARC rebuild", NULL,
	"successful, restored %llu blocks",
	(u_longlong_t)zfs_refcount_count(&dev->l2ad_lb_count));
	} else if (err == 0 && zfs_refcount_count(&dev->l2ad_lb_count) == 0) {
	/*
	* No error but also nothing restored, meaning the lbps array
	* in the device header points to invalid/non-present log
	* blocks. Reset the header.
	*/
	spa_history_log_internal(spa, "L2ARC rebuild", NULL,
	"no valid log blocks");
	bzero(l2dhdr, dev->l2ad_dev_hdr_asize);
	l2arc_dev_hdr_update(dev);
	} else if (err == ECANCELED) {
	/*
	* In case the rebuild was canceled do not log to spa history
	* log as the pool may be in the process of being removed.
	*/
	zfs_dbgmsg("L2ARC rebuild aborted, restored %llu blocks",
	(u_longlong_t)zfs_refcount_count(&dev->l2ad_lb_count));
	} else if (err != 0) {
	spa_history_log_internal(spa, "L2ARC rebuild", NULL,
	"aborted, restored %llu blocks",
	(u_longlong_t)zfs_refcount_count(&dev->l2ad_lb_count));
	}

	if (lock_held)
	spa_config_exit(spa, SCL_L2ARC, vd);

	return (err);
	}

	/*
	* Attempts to read the device header on the provided L2ARC device and writes
	* it to `hdr'. On success, this function returns 0, otherwise the appropriate
	* error code is returned.
	*/
	static int
	l2arc_dev_hdr_read(l2arc_dev_t *dev)
	{
	int err;
	uint64_t guid;
	l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr;
	const uint64_t l2dhdr_asize = dev->l2ad_dev_hdr_asize;
	abd_t *abd;

	guid = spa_guid(dev->l2ad_vdev->vdev_spa);

	abd = abd_get_from_buf(l2dhdr, l2dhdr_asize);

	err = zio_wait(zio_read_phys(NULL, dev->l2ad_vdev,
	VDEV_LABEL_START_SIZE, l2dhdr_asize, abd,
	ZIO_CHECKSUM_LABEL, NULL, NULL, ZIO_PRIORITY_SYNC_READ,
	ZIO_FLAG_DONT_CACHE \| ZIO_FLAG_CANFAIL \|
	ZIO_FLAG_DONT_PROPAGATE \| ZIO_FLAG_DONT_RETRY \|
	ZIO_FLAG_SPECULATIVE, B_FALSE));

	abd_free(abd);

	if (err != 0) {
	ARCSTAT_BUMP(arcstat_l2_rebuild_abort_dh_errors);
	zfs_dbgmsg("L2ARC IO error (%d) while reading device header, "
	"vdev guid: %llu", err,
	(u_longlong_t)dev->l2ad_vdev->vdev_guid);
	return (err);
	}

	if (l2dhdr->dh_magic == BSWAP_64(L2ARC_DEV_HDR_MAGIC))
	byteswap_uint64_array(l2dhdr, sizeof (*l2dhdr));

	if (l2dhdr->dh_magic != L2ARC_DEV_HDR_MAGIC \|\|
	l2dhdr->dh_spa_guid != guid \|\|
	l2dhdr->dh_vdev_guid != dev->l2ad_vdev->vdev_guid \|\|
	l2dhdr->dh_version != L2ARC_PERSISTENT_VERSION \|\|
	l2dhdr->dh_log_entries != dev->l2ad_log_entries \|\|
	l2dhdr->dh_end != dev->l2ad_end \|\|
	!l2arc_range_check_overlap(dev->l2ad_start, dev->l2ad_end,
	l2dhdr->dh_evict) \|\|
	(l2dhdr->dh_trim_state != VDEV_TRIM_COMPLETE &&
	l2arc_trim_ahead > 0)) {
	/*
	* Attempt to rebuild a device containing no actual dev hdr
	* or containing a header from some other pool or from another
	* version of persistent L2ARC.
	*/
	ARCSTAT_BUMP(arcstat_l2_rebuild_abort_unsupported);
	return (SET_ERROR(ENOTSUP));
	}

	return (0);
	}

	/*
	* Reads L2ARC log blocks from storage and validates their contents.
	*
	* This function implements a simple fetcher to make sure that while
	* we're processing one buffer the L2ARC is already fetching the next
	* one in the chain.
	*
	* The arguments this_lp and next_lp point to the current and next log block
	* address in the block chain. Similarly, this_lb and next_lb hold the
	* l2arc_log_blk_phys_t's of the current and next L2ARC blk.
	*
	* The `this_io' and `next_io' arguments are used for block fetching.
	* When issuing the first blk IO during rebuild, you should pass NULL for
	* `this_io'. This function will then issue a sync IO to read the block and
	* also issue an async IO to fetch the next block in the block chain. The
	* fetched IO is returned in `next_io'. On subsequent calls to this
	* function, pass the value returned in `next_io' from the previous call
	* as `this_io' and a fresh `next_io' pointer to hold the next fetch IO.
	* Prior to the call, you should initialize your `next_io' pointer to be
	* NULL. If no fetch IO was issued, the pointer is left set at NULL.
	*
	* On success, this function returns 0, otherwise it returns an appropriate
	* error code. On error the fetching IO is aborted and cleared before
	* returning from this function. Therefore, if we return `success', the
	* caller can assume that we have taken care of cleanup of fetch IOs.
	*/
	static int
	l2arc_log_blk_read(l2arc_dev_t *dev,
	const l2arc_log_blkptr_t this_lbp, const l2arc_log_blkptr_t next_lbp,
	l2arc_log_blk_phys_t this_lb, l2arc_log_blk_phys_t next_lb,
	zio_t this_io, zio_t *next_io)
	{
	int err = 0;
	zio_cksum_t cksum;
	abd_t *abd = NULL;
	uint64_t asize;

	ASSERT(this_lbp != NULL && next_lbp != NULL);
	ASSERT(this_lb != NULL && next_lb != NULL);
	ASSERT(next_io != NULL && *next_io == NULL);
	ASSERT(l2arc_log_blkptr_valid(dev, this_lbp));

	/*
	* Check to see if we have issued the IO for this log block in a
	* previous run. If not, this is the first call, so issue it now.
	*/
	if (this_io == NULL) {
	this_io = l2arc_log_blk_fetch(dev->l2ad_vdev, this_lbp,
	this_lb);
	}

	/*
	* Peek to see if we can start issuing the next IO immediately.
	*/
	if (l2arc_log_blkptr_valid(dev, next_lbp)) {
	/*
	* Start issuing IO for the next log block early - this
	* should help keep the L2ARC device busy while we
	* decompress and restore this log block.
	*/
	*next_io = l2arc_log_blk_fetch(dev->l2ad_vdev, next_lbp,
	next_lb);
	}

	/* Wait for the IO to read this log block to complete */
	if ((err = zio_wait(this_io)) != 0) {
	ARCSTAT_BUMP(arcstat_l2_rebuild_abort_io_errors);
	zfs_dbgmsg("L2ARC IO error (%d) while reading log block, "
	"offset: %llu, vdev guid: %llu", err,
	(u_longlong_t)this_lbp->lbp_daddr,
	(u_longlong_t)dev->l2ad_vdev->vdev_guid);
	goto cleanup;
	}

	/*
	* Make sure the buffer checks out.
	* L2BLK_GET_PSIZE returns aligned size for log blocks.
	*/
	asize = L2BLK_GET_PSIZE((this_lbp)->lbp_prop);
	fletcher_4_native(this_lb, asize, NULL, &cksum);
	if (!ZIO_CHECKSUM_EQUAL(cksum, this_lbp->lbp_cksum)) {
	ARCSTAT_BUMP(arcstat_l2_rebuild_abort_cksum_lb_errors);
	zfs_dbgmsg("L2ARC log block cksum failed, offset: %llu, "
	"vdev guid: %llu, l2ad_hand: %llu, l2ad_evict: %llu",
	(u_longlong_t)this_lbp->lbp_daddr,
	(u_longlong_t)dev->l2ad_vdev->vdev_guid,
	(u_longlong_t)dev->l2ad_hand,
	(u_longlong_t)dev->l2ad_evict);
	err = SET_ERROR(ECKSUM);
	goto cleanup;
	}

	/* Now we can take our time decoding this buffer */
	switch (L2BLK_GET_COMPRESS((this_lbp)->lbp_prop)) {
	case ZIO_COMPRESS_OFF:
	break;
	case ZIO_COMPRESS_LZ4:
	abd = abd_alloc_for_io(asize, B_TRUE);
	abd_copy_from_buf_off(abd, this_lb, 0, asize);
	if ((err = zio_decompress_data(
	L2BLK_GET_COMPRESS((this_lbp)->lbp_prop),
	abd, this_lb, asize, sizeof (*this_lb), NULL)) != 0) {
	err = SET_ERROR(EINVAL);
	goto cleanup;
	}
	break;
	default:
	err = SET_ERROR(EINVAL);
	goto cleanup;
	}
	if (this_lb->lb_magic == BSWAP_64(L2ARC_LOG_BLK_MAGIC))
	byteswap_uint64_array(this_lb, sizeof (*this_lb));
	if (this_lb->lb_magic != L2ARC_LOG_BLK_MAGIC) {
	err = SET_ERROR(EINVAL);
	goto cleanup;
	}
	cleanup:
	/* Abort an in-flight fetch I/O in case of error */
	if (err != 0 && *next_io != NULL) {
	l2arc_log_blk_fetch_abort(*next_io);
	*next_io = NULL;
	}
	if (abd != NULL)
	abd_free(abd);
	return (err);
	}

	/*
	* Restores the payload of a log block to ARC. This creates empty ARC hdr
	* entries which only contain an l2arc hdr, essentially restoring the
	* buffers to their L2ARC evicted state. This function also updates space
	* usage on the L2ARC vdev to make sure it tracks restored buffers.
	*/
	static void
	l2arc_log_blk_restore(l2arc_dev_t dev, const l2arc_log_blk_phys_t lb,
	uint64_t lb_asize)
	{
	uint64_t size = 0, asize = 0;
	uint64_t log_entries = dev->l2ad_log_entries;

	/*
	* Usually arc_adapt() is called only for data, not headers, but
	* since we may allocate significant amount of memory here, let ARC
	* grow its arc_c.
	*/
	arc_adapt(log_entries * HDR_L2ONLY_SIZE, arc_l2c_only);

	for (int i = log_entries - 1; i >= 0; i--) {
	/*
	* Restore goes in the reverse temporal direction to preserve
	* correct temporal ordering of buffers in the l2ad_buflist.
	* l2arc_hdr_restore also does a list_insert_tail instead of
	* list_insert_head on the l2ad_buflist:
	*
	* LIST l2ad_buflist LIST
	* HEAD <------ (time) ------ TAIL
	* direction +-----+-----+-----+-----+-----+ direction
	* of l2arc <== \| buf \| buf \| buf \| buf \| buf \| ===> of rebuild
	* fill +-----+-----+-----+-----+-----+
	* ^ ^
	* \| \|
	* \| \|
	* l2arc_feed_thread l2arc_rebuild
	* will place new bufs here restores bufs here
	*
	* During l2arc_rebuild() the device is not used by
	* l2arc_feed_thread() as dev->l2ad_rebuild is set to true.
	*/
	size += L2BLK_GET_LSIZE((&lb->lb_entries[i])->le_prop);
	asize += vdev_psize_to_asize(dev->l2ad_vdev,
	L2BLK_GET_PSIZE((&lb->lb_entries[i])->le_prop));
	l2arc_hdr_restore(&lb->lb_entries[i], dev);
	}

	/*
	* Record rebuild stats:
	* size Logical size of restored buffers in the L2ARC
	* asize Aligned size of restored buffers in the L2ARC
	*/
	ARCSTAT_INCR(arcstat_l2_rebuild_size, size);
	ARCSTAT_INCR(arcstat_l2_rebuild_asize, asize);
	ARCSTAT_INCR(arcstat_l2_rebuild_bufs, log_entries);
	ARCSTAT_F_AVG(arcstat_l2_log_blk_avg_asize, lb_asize);
	ARCSTAT_F_AVG(arcstat_l2_data_to_meta_ratio, asize / lb_asize);
	ARCSTAT_BUMP(arcstat_l2_rebuild_log_blks);
	}

	/*
	* Restores a single ARC buf hdr from a log entry. The ARC buffer is put
	* into a state indicating that it has been evicted to L2ARC.
	*/
	static void
	l2arc_hdr_restore(const l2arc_log_ent_phys_t le, l2arc_dev_t dev)
	{
	arc_buf_hdr_t hdr, exists;
	kmutex_t *hash_lock;
	arc_buf_contents_t type = L2BLK_GET_TYPE((le)->le_prop);
	uint64_t asize;

	/*
	* Do all the allocation before grabbing any locks, this lets us
	* sleep if memory is full and we don't have to deal with failed
	* allocations.
	*/
	hdr = arc_buf_alloc_l2only(L2BLK_GET_LSIZE((le)->le_prop), type,
	dev, le->le_dva, le->le_daddr,
	L2BLK_GET_PSIZE((le)->le_prop), le->le_birth,
	L2BLK_GET_COMPRESS((le)->le_prop), le->le_complevel,
	L2BLK_GET_PROTECTED((le)->le_prop),
	L2BLK_GET_PREFETCH((le)->le_prop),
	L2BLK_GET_STATE((le)->le_prop));
	asize = vdev_psize_to_asize(dev->l2ad_vdev,
	L2BLK_GET_PSIZE((le)->le_prop));

	/*
	* vdev_space_update() has to be called before arc_hdr_destroy() to
	* avoid underflow since the latter also calls vdev_space_update().
	*/
	l2arc_hdr_arcstats_increment(hdr);
	vdev_space_update(dev->l2ad_vdev, asize, 0, 0);

	mutex_enter(&dev->l2ad_mtx);
	list_insert_tail(&dev->l2ad_buflist, hdr);
	(void) zfs_refcount_add_many(&dev->l2ad_alloc, arc_hdr_size(hdr), hdr);
	mutex_exit(&dev->l2ad_mtx);

	exists = buf_hash_insert(hdr, &hash_lock);
	if (exists) {
	/* Buffer was already cached, no need to restore it. */
	arc_hdr_destroy(hdr);
	/*
	* If the buffer is already cached, check whether it has
	* L2ARC metadata. If not, enter them and update the flag.
	* This is important is case of onlining a cache device, since
	* we previously evicted all L2ARC metadata from ARC.
	*/
	if (!HDR_HAS_L2HDR(exists)) {
	arc_hdr_set_flags(exists, ARC_FLAG_HAS_L2HDR);
	exists->b_l2hdr.b_dev = dev;
	exists->b_l2hdr.b_daddr = le->le_daddr;
	exists->b_l2hdr.b_arcs_state =
	L2BLK_GET_STATE((le)->le_prop);
	mutex_enter(&dev->l2ad_mtx);
	list_insert_tail(&dev->l2ad_buflist, exists);
	(void) zfs_refcount_add_many(&dev->l2ad_alloc,
	arc_hdr_size(exists), exists);
	mutex_exit(&dev->l2ad_mtx);
	l2arc_hdr_arcstats_increment(exists);
	vdev_space_update(dev->l2ad_vdev, asize, 0, 0);
	}
	ARCSTAT_BUMP(arcstat_l2_rebuild_bufs_precached);
	}

	mutex_exit(hash_lock);
	}

	/*
	* Starts an asynchronous read IO to read a log block. This is used in log
	* block reconstruction to start reading the next block before we are done
	* decoding and reconstructing the current block, to keep the l2arc device
	* nice and hot with read IO to process.
	* The returned zio will contain a newly allocated memory buffers for the IO
	* data which should then be freed by the caller once the zio is no longer
	* needed (i.e. due to it having completed). If you wish to abort this
	* zio, you should do so using l2arc_log_blk_fetch_abort, which takes
	* care of disposing of the allocated buffers correctly.
	*/
	static zio_t *
	l2arc_log_blk_fetch(vdev_t vd, const l2arc_log_blkptr_t lbp,
	l2arc_log_blk_phys_t *lb)
	{
	uint32_t asize;
	zio_t *pio;
	l2arc_read_callback_t *cb;

	/* L2BLK_GET_PSIZE returns aligned size for log blocks */
	asize = L2BLK_GET_PSIZE((lbp)->lbp_prop);
	ASSERT(asize <= sizeof (l2arc_log_blk_phys_t));

	cb = kmem_zalloc(sizeof (l2arc_read_callback_t), KM_SLEEP);
	cb->l2rcb_abd = abd_get_from_buf(lb, asize);
	pio = zio_root(vd->vdev_spa, l2arc_blk_fetch_done, cb,
	ZIO_FLAG_DONT_CACHE \| ZIO_FLAG_CANFAIL \| ZIO_FLAG_DONT_PROPAGATE \|
	ZIO_FLAG_DONT_RETRY);
	(void) zio_nowait(zio_read_phys(pio, vd, lbp->lbp_daddr, asize,
	cb->l2rcb_abd, ZIO_CHECKSUM_OFF, NULL, NULL,
	ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_DONT_CACHE \| ZIO_FLAG_CANFAIL \|
	ZIO_FLAG_DONT_PROPAGATE \| ZIO_FLAG_DONT_RETRY, B_FALSE));

	return (pio);
	}

	/*
	* Aborts a zio returned from l2arc_log_blk_fetch and frees the data
	* buffers allocated for it.
	*/
	static void
	l2arc_log_blk_fetch_abort(zio_t *zio)
	{
	(void) zio_wait(zio);
	}

	/*
	* Creates a zio to update the device header on an l2arc device.
	*/
	void
	l2arc_dev_hdr_update(l2arc_dev_t *dev)
	{
	l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr;
	const uint64_t l2dhdr_asize = dev->l2ad_dev_hdr_asize;
	abd_t *abd;
	int err;

	VERIFY(spa_config_held(dev->l2ad_spa, SCL_STATE_ALL, RW_READER));

	l2dhdr->dh_magic = L2ARC_DEV_HDR_MAGIC;
	l2dhdr->dh_version = L2ARC_PERSISTENT_VERSION;
	l2dhdr->dh_spa_guid = spa_guid(dev->l2ad_vdev->vdev_spa);
	l2dhdr->dh_vdev_guid = dev->l2ad_vdev->vdev_guid;
	l2dhdr->dh_log_entries = dev->l2ad_log_entries;
	l2dhdr->dh_evict = dev->l2ad_evict;
	l2dhdr->dh_start = dev->l2ad_start;
	l2dhdr->dh_end = dev->l2ad_end;
	l2dhdr->dh_lb_asize = zfs_refcount_count(&dev->l2ad_lb_asize);
	l2dhdr->dh_lb_count = zfs_refcount_count(&dev->l2ad_lb_count);
	l2dhdr->dh_flags = 0;
	l2dhdr->dh_trim_action_time = dev->l2ad_vdev->vdev_trim_action_time;
	l2dhdr->dh_trim_state = dev->l2ad_vdev->vdev_trim_state;
	if (dev->l2ad_first)
	l2dhdr->dh_flags \|= L2ARC_DEV_HDR_EVICT_FIRST;

	abd = abd_get_from_buf(l2dhdr, l2dhdr_asize);

	err = zio_wait(zio_write_phys(NULL, dev->l2ad_vdev,
	VDEV_LABEL_START_SIZE, l2dhdr_asize, abd, ZIO_CHECKSUM_LABEL, NULL,
	NULL, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_CANFAIL, B_FALSE));

	abd_free(abd);

	if (err != 0) {
	zfs_dbgmsg("L2ARC IO error (%d) while writing device header, "
	"vdev guid: %llu", err,
	(u_longlong_t)dev->l2ad_vdev->vdev_guid);
	}
	}

	/*
	* Commits a log block to the L2ARC device. This routine is invoked from
	* l2arc_write_buffers when the log block fills up.
	* This function allocates some memory to temporarily hold the serialized
	* buffer to be written. This is then released in l2arc_write_done.
	*/
	static void
	l2arc_log_blk_commit(l2arc_dev_t dev, zio_t pio, l2arc_write_callback_t *cb)
	{
	l2arc_log_blk_phys_t *lb = &dev->l2ad_log_blk;
	l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr;
	uint64_t psize, asize;
	zio_t *wzio;
	l2arc_lb_abd_buf_t *abd_buf;
	uint8_t *tmpbuf;
	l2arc_lb_ptr_buf_t *lb_ptr_buf;

	VERIFY3S(dev->l2ad_log_ent_idx, ==, dev->l2ad_log_entries);

	tmpbuf = zio_buf_alloc(sizeof (*lb));
	abd_buf = zio_buf_alloc(sizeof (*abd_buf));
	abd_buf->abd = abd_get_from_buf(lb, sizeof (*lb));
	lb_ptr_buf = kmem_zalloc(sizeof (l2arc_lb_ptr_buf_t), KM_SLEEP);
	lb_ptr_buf->lb_ptr = kmem_zalloc(sizeof (l2arc_log_blkptr_t), KM_SLEEP);

	/* link the buffer into the block chain */
	lb->lb_prev_lbp = l2dhdr->dh_start_lbps[1];
	lb->lb_magic = L2ARC_LOG_BLK_MAGIC;

	/*
	* l2arc_log_blk_commit() may be called multiple times during a single
	* l2arc_write_buffers() call. Save the allocated abd buffers in a list
	* so we can free them in l2arc_write_done() later on.
	*/
	list_insert_tail(&cb->l2wcb_abd_list, abd_buf);

	/* try to compress the buffer */
	psize = zio_compress_data(ZIO_COMPRESS_LZ4,
	abd_buf->abd, tmpbuf, sizeof (*lb), 0);

	/* a log block is never entirely zero */
	ASSERT(psize != 0);
	asize = vdev_psize_to_asize(dev->l2ad_vdev, psize);
	ASSERT(asize <= sizeof (*lb));

	/*
	* Update the start log block pointer in the device header to point
	* to the log block we're about to write.
	*/
	l2dhdr->dh_start_lbps[1] = l2dhdr->dh_start_lbps[0];
	l2dhdr->dh_start_lbps[0].lbp_daddr = dev->l2ad_hand;
	l2dhdr->dh_start_lbps[0].lbp_payload_asize =
	dev->l2ad_log_blk_payload_asize;
	l2dhdr->dh_start_lbps[0].lbp_payload_start =
	dev->l2ad_log_blk_payload_start;
	_NOTE(CONSTCOND)
	L2BLK_SET_LSIZE(
	(&l2dhdr->dh_start_lbps[0])->lbp_prop, sizeof (*lb));
	L2BLK_SET_PSIZE(
	(&l2dhdr->dh_start_lbps[0])->lbp_prop, asize);
	L2BLK_SET_CHECKSUM(
	(&l2dhdr->dh_start_lbps[0])->lbp_prop,
	ZIO_CHECKSUM_FLETCHER_4);
	if (asize < sizeof (*lb)) {
	/* compression succeeded */
	bzero(tmpbuf + psize, asize - psize);
	L2BLK_SET_COMPRESS(
	(&l2dhdr->dh_start_lbps[0])->lbp_prop,
	ZIO_COMPRESS_LZ4);
	} else {
	/* compression failed */
	bcopy(lb, tmpbuf, sizeof (*lb));
	L2BLK_SET_COMPRESS(
	(&l2dhdr->dh_start_lbps[0])->lbp_prop,
	ZIO_COMPRESS_OFF);
	}

	/* checksum what we're about to write */
	fletcher_4_native(tmpbuf, asize, NULL,
	&l2dhdr->dh_start_lbps[0].lbp_cksum);

	abd_free(abd_buf->abd);

	/* perform the write itself */
	abd_buf->abd = abd_get_from_buf(tmpbuf, sizeof (*lb));
	abd_take_ownership_of_buf(abd_buf->abd, B_TRUE);
	wzio = zio_write_phys(pio, dev->l2ad_vdev, dev->l2ad_hand,
	asize, abd_buf->abd, ZIO_CHECKSUM_OFF, NULL, NULL,
	ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_CANFAIL, B_FALSE);
	DTRACE_PROBE2(l2arc__write, vdev_t , dev->l2ad_vdev, zio_t , wzio);
	(void) zio_nowait(wzio);

	dev->l2ad_hand += asize;
	/*
	* Include the committed log block's pointer in the list of pointers
	* to log blocks present in the L2ARC device.
	*/
	bcopy(&l2dhdr->dh_start_lbps[0], lb_ptr_buf->lb_ptr,
	sizeof (l2arc_log_blkptr_t));
	mutex_enter(&dev->l2ad_mtx);
	list_insert_head(&dev->l2ad_lbptr_list, lb_ptr_buf);
	ARCSTAT_INCR(arcstat_l2_log_blk_asize, asize);
	ARCSTAT_BUMP(arcstat_l2_log_blk_count);
	zfs_refcount_add_many(&dev->l2ad_lb_asize, asize, lb_ptr_buf);
	zfs_refcount_add(&dev->l2ad_lb_count, lb_ptr_buf);
	mutex_exit(&dev->l2ad_mtx);
	vdev_space_update(dev->l2ad_vdev, asize, 0, 0);

	/* bump the kstats */
	ARCSTAT_INCR(arcstat_l2_write_bytes, asize);
	ARCSTAT_BUMP(arcstat_l2_log_blk_writes);
	ARCSTAT_F_AVG(arcstat_l2_log_blk_avg_asize, asize);
	ARCSTAT_F_AVG(arcstat_l2_data_to_meta_ratio,
	dev->l2ad_log_blk_payload_asize / asize);

	/* start a new log block */
	dev->l2ad_log_ent_idx = 0;
	dev->l2ad_log_blk_payload_asize = 0;
	dev->l2ad_log_blk_payload_start = 0;
	}

	/*
	* Validates an L2ARC log block address to make sure that it can be read
	* from the provided L2ARC device.
	*/
	boolean_t
	l2arc_log_blkptr_valid(l2arc_dev_t dev, const l2arc_log_blkptr_t lbp)
	{
	/* L2BLK_GET_PSIZE returns aligned size for log blocks */
	uint64_t asize = L2BLK_GET_PSIZE((lbp)->lbp_prop);
	uint64_t end = lbp->lbp_daddr + asize - 1;
	uint64_t start = lbp->lbp_payload_start;
	boolean_t evicted = B_FALSE;

	/*
	* A log block is valid if all of the following conditions are true:
	* - it fits entirely (including its payload) between l2ad_start and
	* l2ad_end
	* - it has a valid size
	* - neither the log block itself nor part of its payload was evicted
	* by l2arc_evict():
	*
	* l2ad_hand l2ad_evict
	* \| \| lbp_daddr
	* \| start \| \| end
	* \| \| \| \| \|
	* V V V V V
	* l2ad_start ============================================ l2ad_end
	* --------------------------\|\|\|\|
	* ^ ^
	* \| log block
	* payload
	*/

	evicted =
	l2arc_range_check_overlap(start, end, dev->l2ad_hand) \|\|
	l2arc_range_check_overlap(start, end, dev->l2ad_evict) \|\|
	l2arc_range_check_overlap(dev->l2ad_hand, dev->l2ad_evict, start) \|\|
	l2arc_range_check_overlap(dev->l2ad_hand, dev->l2ad_evict, end);

	return (start >= dev->l2ad_start && end <= dev->l2ad_end &&
	asize > 0 && asize <= sizeof (l2arc_log_blk_phys_t) &&
	(!evicted \|\| dev->l2ad_first));
	}

	/*
	* Inserts ARC buffer header `hdr' into the current L2ARC log block on
	* the device. The buffer being inserted must be present in L2ARC.
	* Returns B_TRUE if the L2ARC log block is full and needs to be committed
	* to L2ARC, or B_FALSE if it still has room for more ARC buffers.
	*/
	static boolean_t
	l2arc_log_blk_insert(l2arc_dev_t dev, const arc_buf_hdr_t hdr)
	{
	l2arc_log_blk_phys_t *lb = &dev->l2ad_log_blk;
	l2arc_log_ent_phys_t *le;

	if (dev->l2ad_log_entries == 0)
	return (B_FALSE);

	int index = dev->l2ad_log_ent_idx++;

	ASSERT3S(index, <, dev->l2ad_log_entries);
	ASSERT(HDR_HAS_L2HDR(hdr));

	le = &lb->lb_entries[index];
	bzero(le, sizeof (*le));
	le->le_dva = hdr->b_dva;
	le->le_birth = hdr->b_birth;
	le->le_daddr = hdr->b_l2hdr.b_daddr;
	if (index == 0)
	dev->l2ad_log_blk_payload_start = le->le_daddr;
	L2BLK_SET_LSIZE((le)->le_prop, HDR_GET_LSIZE(hdr));
	L2BLK_SET_PSIZE((le)->le_prop, HDR_GET_PSIZE(hdr));
	L2BLK_SET_COMPRESS((le)->le_prop, HDR_GET_COMPRESS(hdr));
	le->le_complevel = hdr->b_complevel;
	L2BLK_SET_TYPE((le)->le_prop, hdr->b_type);
	L2BLK_SET_PROTECTED((le)->le_prop, !!(HDR_PROTECTED(hdr)));
	L2BLK_SET_PREFETCH((le)->le_prop, !!(HDR_PREFETCH(hdr)));
	L2BLK_SET_STATE((le)->le_prop, hdr->b_l1hdr.b_state->arcs_state);

	dev->l2ad_log_blk_payload_asize += vdev_psize_to_asize(dev->l2ad_vdev,
	HDR_GET_PSIZE(hdr));

	return (dev->l2ad_log_ent_idx == dev->l2ad_log_entries);
	}

	/*
	* Checks whether a given L2ARC device address sits in a time-sequential
	* range. The trick here is that the L2ARC is a rotary buffer, so we can't
	* just do a range comparison, we need to handle the situation in which the
	* range wraps around the end of the L2ARC device. Arguments:
	* bottom -- Lower end of the range to check (written to earlier).
	* top -- Upper end of the range to check (written to later).
	* check -- The address for which we want to determine if it sits in
	* between the top and bottom.
	*
	* The 3-way conditional below represents the following cases:
	*
	* bottom < top : Sequentially ordered case:
	* <check>--------+-------------------+
	* \| (overlap here?) \|
	* L2ARC dev V V
	* \|---------------<bottom>============<top>--------------\|
	*
	* bottom > top: Looped-around case:
	* <check>--------+------------------+
	* \| (overlap here?) \|
	* L2ARC dev V V
	* \|===============<top>---------------<bottom>===========\|
	* ^ ^
	* \| (or here?) \|
	* +---------------+---------<check>
	*
	* top == bottom : Just a single address comparison.
	*/
	boolean_t
	l2arc_range_check_overlap(uint64_t bottom, uint64_t top, uint64_t check)
	{
	if (bottom < top)
	return (bottom <= check && check <= top);
	else if (bottom > top)
	return (check <= top \|\| bottom <= check);
	else
	return (check == top);
	}

	EXPORT_SYMBOL(arc_buf_size);
	EXPORT_SYMBOL(arc_write);
	EXPORT_SYMBOL(arc_read);
	EXPORT_SYMBOL(arc_buf_info);
	EXPORT_SYMBOL(arc_getbuf_func);
	EXPORT_SYMBOL(arc_add_prune_callback);
	EXPORT_SYMBOL(arc_remove_prune_callback);

	/* BEGIN CSTYLED */
	-ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, min, param_set_arc_long,
	+ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, min, param_set_arc_min,
	param_get_long, ZMOD_RW, "Min arc size");

	-ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, max, param_set_arc_long,
	+ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, max, param_set_arc_max,
	param_get_long, ZMOD_RW, "Max arc size");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, meta_limit, param_set_arc_long,
	param_get_long, ZMOD_RW, "Metadata limit for arc size");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, meta_limit_percent,
	param_set_arc_long, param_get_long, ZMOD_RW,
	"Percent of arc size for arc meta limit");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, meta_min, param_set_arc_long,
	param_get_long, ZMOD_RW, "Min arc metadata");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, meta_prune, INT, ZMOD_RW,
	"Meta objects to scan for prune");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, meta_adjust_restarts, INT, ZMOD_RW,
	"Limit number of restarts in arc_evict_meta");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, meta_strategy, INT, ZMOD_RW,
	"Meta reclaim strategy");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, grow_retry, param_set_arc_int,
	param_get_int, ZMOD_RW, "Seconds before growing arc size");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, p_dampener_disable, INT, ZMOD_RW,
	"Disable arc_p adapt dampener");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, shrink_shift, param_set_arc_int,
	param_get_int, ZMOD_RW, "log2(fraction of arc to reclaim)");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, pc_percent, UINT, ZMOD_RW,
	"Percent of pagecache to reclaim arc to");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, p_min_shift, param_set_arc_int,
	param_get_int, ZMOD_RW, "arc_c shift to calc min/max arc_p");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, average_blocksize, INT, ZMOD_RD,
	"Target average block size");

	ZFS_MODULE_PARAM(zfs, zfs_, compressed_arc_enabled, INT, ZMOD_RW,
	"Disable compressed arc buffers");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, min_prefetch_ms, param_set_arc_int,
	param_get_int, ZMOD_RW, "Min life of prefetch block in ms");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, min_prescient_prefetch_ms,
	param_set_arc_int, param_get_int, ZMOD_RW,
	"Min life of prescient prefetched block in ms");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, write_max, ULONG, ZMOD_RW,
	"Max write bytes per interval");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, write_boost, ULONG, ZMOD_RW,
	"Extra write bytes during device warmup");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, headroom, ULONG, ZMOD_RW,
	"Number of max device writes to precache");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, headroom_boost, ULONG, ZMOD_RW,
	"Compressed l2arc_headroom multiplier");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, trim_ahead, ULONG, ZMOD_RW,
	"TRIM ahead L2ARC write size multiplier");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, feed_secs, ULONG, ZMOD_RW,
	"Seconds between L2ARC writing");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, feed_min_ms, ULONG, ZMOD_RW,
	"Min feed interval in milliseconds");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, noprefetch, INT, ZMOD_RW,
	"Skip caching prefetched buffers");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, feed_again, INT, ZMOD_RW,
	"Turbo L2ARC warmup");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, norw, INT, ZMOD_RW,
	"No reads during writes");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, meta_percent, INT, ZMOD_RW,
	"Percent of ARC size allowed for L2ARC-only headers");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, rebuild_enabled, INT, ZMOD_RW,
	"Rebuild the L2ARC when importing a pool");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, rebuild_blocks_min_l2size, ULONG, ZMOD_RW,
	"Min size in bytes to write rebuild log blocks in L2ARC");

	ZFS_MODULE_PARAM(zfs_l2arc, l2arc_, mfuonly, INT, ZMOD_RW,
	"Cache only MFU data from ARC into L2ARC");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, lotsfree_percent, param_set_arc_int,
	param_get_int, ZMOD_RW, "System free memory I/O throttle in bytes");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, sys_free, param_set_arc_long,
	param_get_long, ZMOD_RW, "System free memory target size in bytes");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, dnode_limit, param_set_arc_long,
	param_get_long, ZMOD_RW, "Minimum bytes of dnodes in arc");

	ZFS_MODULE_PARAM_CALL(zfs_arc, zfs_arc_, dnode_limit_percent,
	param_set_arc_long, param_get_long, ZMOD_RW,
	"Percent of ARC meta buffers for dnodes");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, dnode_reduce_percent, ULONG, ZMOD_RW,
	"Percentage of excess dnodes to try to unpin");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, eviction_pct, INT, ZMOD_RW,
	"When full, ARC allocation waits for eviction of this % of alloc size");

	ZFS_MODULE_PARAM(zfs_arc, zfs_arc_, evict_batch_limit, INT, ZMOD_RW,
	"The number of headers to evict per sublist before moving to the next");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/dbuf.c b/sys/contrib/openzfs/module/zfs/dbuf.c
	index 45886e5739aa..b21ea8d358ea 100644
	--- a/sys/contrib/openzfs/module/zfs/dbuf.c
	+++ b/sys/contrib/openzfs/module/zfs/dbuf.c
	@@ -1,5056 +1,5056 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2012, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	* Copyright (c) 2019, Klara Inc.
	* Copyright (c) 2019, Allan Jude
	*/

	#include <sys/zfs_context.h>
	#include <sys/arc.h>
	#include <sys/dmu.h>
	#include <sys/dmu_send.h>
	#include <sys/dmu_impl.h>
	#include <sys/dbuf.h>
	#include <sys/dmu_objset.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dmu_tx.h>
	#include <sys/spa.h>
	#include <sys/zio.h>
	#include <sys/dmu_zfetch.h>
	#include <sys/sa.h>
	#include <sys/sa_impl.h>
	#include <sys/zfeature.h>
	#include <sys/blkptr.h>
	#include <sys/range_tree.h>
	#include <sys/trace_zfs.h>
	#include <sys/callb.h>
	#include <sys/abd.h>
	#include <sys/vdev.h>
	#include <cityhash.h>
	#include <sys/spa_impl.h>
	#include <sys/wmsum.h>

	kstat_t *dbuf_ksp;

	typedef struct dbuf_stats {
	/*
	* Various statistics about the size of the dbuf cache.
	*/
	kstat_named_t cache_count;
	kstat_named_t cache_size_bytes;
	kstat_named_t cache_size_bytes_max;
	/*
	* Statistics regarding the bounds on the dbuf cache size.
	*/
	kstat_named_t cache_target_bytes;
	kstat_named_t cache_lowater_bytes;
	kstat_named_t cache_hiwater_bytes;
	/*
	* Total number of dbuf cache evictions that have occurred.
	*/
	kstat_named_t cache_total_evicts;
	/*
	* The distribution of dbuf levels in the dbuf cache and
	* the total size of all dbufs at each level.
	*/
	kstat_named_t cache_levels[DN_MAX_LEVELS];
	kstat_named_t cache_levels_bytes[DN_MAX_LEVELS];
	/*
	* Statistics about the dbuf hash table.
	*/
	kstat_named_t hash_hits;
	kstat_named_t hash_misses;
	kstat_named_t hash_collisions;
	kstat_named_t hash_elements;
	kstat_named_t hash_elements_max;
	/*
	* Number of sublists containing more than one dbuf in the dbuf
	* hash table. Keep track of the longest hash chain.
	*/
	kstat_named_t hash_chains;
	kstat_named_t hash_chain_max;
	/*
	* Number of times a dbuf_create() discovers that a dbuf was
	* already created and in the dbuf hash table.
	*/
	kstat_named_t hash_insert_race;
	/*
	* Statistics about the size of the metadata dbuf cache.
	*/
	kstat_named_t metadata_cache_count;
	kstat_named_t metadata_cache_size_bytes;
	kstat_named_t metadata_cache_size_bytes_max;
	/*
	* For diagnostic purposes, this is incremented whenever we can't add
	* something to the metadata cache because it's full, and instead put
	* the data in the regular dbuf cache.
	*/
	kstat_named_t metadata_cache_overflow;
	} dbuf_stats_t;

	dbuf_stats_t dbuf_stats = {
	{ "cache_count", KSTAT_DATA_UINT64 },
	{ "cache_size_bytes", KSTAT_DATA_UINT64 },
	{ "cache_size_bytes_max", KSTAT_DATA_UINT64 },
	{ "cache_target_bytes", KSTAT_DATA_UINT64 },
	{ "cache_lowater_bytes", KSTAT_DATA_UINT64 },
	{ "cache_hiwater_bytes", KSTAT_DATA_UINT64 },
	{ "cache_total_evicts", KSTAT_DATA_UINT64 },
	{ { "cache_levels_N", KSTAT_DATA_UINT64 } },
	{ { "cache_levels_bytes_N", KSTAT_DATA_UINT64 } },
	{ "hash_hits", KSTAT_DATA_UINT64 },
	{ "hash_misses", KSTAT_DATA_UINT64 },
	{ "hash_collisions", KSTAT_DATA_UINT64 },
	{ "hash_elements", KSTAT_DATA_UINT64 },
	{ "hash_elements_max", KSTAT_DATA_UINT64 },
	{ "hash_chains", KSTAT_DATA_UINT64 },
	{ "hash_chain_max", KSTAT_DATA_UINT64 },
	{ "hash_insert_race", KSTAT_DATA_UINT64 },
	{ "metadata_cache_count", KSTAT_DATA_UINT64 },
	{ "metadata_cache_size_bytes", KSTAT_DATA_UINT64 },
	{ "metadata_cache_size_bytes_max", KSTAT_DATA_UINT64 },
	{ "metadata_cache_overflow", KSTAT_DATA_UINT64 }
	};

	struct {
	wmsum_t cache_count;
	wmsum_t cache_total_evicts;
	wmsum_t cache_levels[DN_MAX_LEVELS];
	wmsum_t cache_levels_bytes[DN_MAX_LEVELS];
	wmsum_t hash_hits;
	wmsum_t hash_misses;
	wmsum_t hash_collisions;
	wmsum_t hash_chains;
	wmsum_t hash_insert_race;
	wmsum_t metadata_cache_count;
	wmsum_t metadata_cache_overflow;
	} dbuf_sums;

	#define DBUF_STAT_INCR(stat, val) \
	wmsum_add(&dbuf_sums.stat, val);
	#define DBUF_STAT_DECR(stat, val) \
	DBUF_STAT_INCR(stat, -(val));
	#define DBUF_STAT_BUMP(stat) \
	DBUF_STAT_INCR(stat, 1);
	#define DBUF_STAT_BUMPDOWN(stat) \
	DBUF_STAT_INCR(stat, -1);
	#define DBUF_STAT_MAX(stat, v) { \
	uint64_t _m; \
	while ((v) > (_m = dbuf_stats.stat.value.ui64) && \
	(_m != atomic_cas_64(&dbuf_stats.stat.value.ui64, _m, (v))))\
	continue; \
	}

	static boolean_t dbuf_undirty(dmu_buf_impl_t db, dmu_tx_t tx);
	static void dbuf_write(dbuf_dirty_record_t dr, arc_buf_t data, dmu_tx_t *tx);
	static void dbuf_sync_leaf_verify_bonus_dnode(dbuf_dirty_record_t *dr);
	static int dbuf_read_verify_dnode_crypt(dmu_buf_impl_t *db, uint32_t flags);

	extern inline void dmu_buf_init_user(dmu_buf_user_t *dbu,
	dmu_buf_evict_func_t *evict_func_sync,
	dmu_buf_evict_func_t *evict_func_async,
	dmu_buf_t **clear_on_evict_dbufp);

	/*
	* Global data structures and functions for the dbuf cache.
	*/
	static kmem_cache_t *dbuf_kmem_cache;
	static taskq_t *dbu_evict_taskq;

	static kthread_t *dbuf_cache_evict_thread;
	static kmutex_t dbuf_evict_lock;
	static kcondvar_t dbuf_evict_cv;
	static boolean_t dbuf_evict_thread_exit;

	/*
	* There are two dbuf caches; each dbuf can only be in one of them at a time.
	*
	* 1. Cache of metadata dbufs, to help make read-heavy administrative commands
	* from /sbin/zfs run faster. The "metadata cache" specifically stores dbufs
	* that represent the metadata that describes filesystems/snapshots/
	* bookmarks/properties/etc. We only evict from this cache when we export a
	* pool, to short-circuit as much I/O as possible for all administrative
	* commands that need the metadata. There is no eviction policy for this
	* cache, because we try to only include types in it which would occupy a
	* very small amount of space per object but create a large impact on the
	* performance of these commands. Instead, after it reaches a maximum size
	* (which should only happen on very small memory systems with a very large
	* number of filesystem objects), we stop taking new dbufs into the
	* metadata cache, instead putting them in the normal dbuf cache.
	*
	* 2. LRU cache of dbufs. The dbuf cache maintains a list of dbufs that
	* are not currently held but have been recently released. These dbufs
	* are not eligible for arc eviction until they are aged out of the cache.
	* Dbufs that are aged out of the cache will be immediately destroyed and
	* become eligible for arc eviction.
	*
	* Dbufs are added to these caches once the last hold is released. If a dbuf is
	* later accessed and still exists in the dbuf cache, then it will be removed
	* from the cache and later re-added to the head of the cache.
	*
	* If a given dbuf meets the requirements for the metadata cache, it will go
	* there, otherwise it will be considered for the generic LRU dbuf cache. The
	* caches and the refcounts tracking their sizes are stored in an array indexed
	* by those caches' matching enum values (from dbuf_cached_state_t).
	*/
	typedef struct dbuf_cache {
	multilist_t cache;
	zfs_refcount_t size ____cacheline_aligned;
	} dbuf_cache_t;
	dbuf_cache_t dbuf_caches[DB_CACHE_MAX];

	/* Size limits for the caches */
	unsigned long dbuf_cache_max_bytes = ULONG_MAX;
	unsigned long dbuf_metadata_cache_max_bytes = ULONG_MAX;

	/* Set the default sizes of the caches to log2 fraction of arc size */
	int dbuf_cache_shift = 5;
	int dbuf_metadata_cache_shift = 6;

	static unsigned long dbuf_cache_target_bytes(void);
	static unsigned long dbuf_metadata_cache_target_bytes(void);

	/*
	* The LRU dbuf cache uses a three-stage eviction policy:
	* - A low water marker designates when the dbuf eviction thread
	* should stop evicting from the dbuf cache.
	* - When we reach the maximum size (aka mid water mark), we
	* signal the eviction thread to run.
	* - The high water mark indicates when the eviction thread
	* is unable to keep up with the incoming load and eviction must
	* happen in the context of the calling thread.
	*
	* The dbuf cache:
	* (max size)
	* low water mid water hi water
	* +----------------------------------------+----------+----------+
	* \| \| \| \|
	* \| \| \| \|
	* \| \| \| \|
	* \| \| \| \|
	* +----------------------------------------+----------+----------+
	* stop signal evict
	* evicting eviction directly
	* thread
	*
	* The high and low water marks indicate the operating range for the eviction
	* thread. The low water mark is, by default, 90% of the total size of the
	* cache and the high water mark is at 110% (both of these percentages can be
	* changed by setting dbuf_cache_lowater_pct and dbuf_cache_hiwater_pct,
	* respectively). The eviction thread will try to ensure that the cache remains
	* within this range by waking up every second and checking if the cache is
	* above the low water mark. The thread can also be woken up by callers adding
	* elements into the cache if the cache is larger than the mid water (i.e max
	* cache size). Once the eviction thread is woken up and eviction is required,
	* it will continue evicting buffers until it's able to reduce the cache size
	* to the low water mark. If the cache size continues to grow and hits the high
	* water mark, then callers adding elements to the cache will begin to evict
	* directly from the cache until the cache is no longer above the high water
	* mark.
	*/

	/*
	* The percentage above and below the maximum cache size.
	*/
	uint_t dbuf_cache_hiwater_pct = 10;
	uint_t dbuf_cache_lowater_pct = 10;

	/* ARGSUSED */
	static int
	dbuf_cons(void vdb, void unused, int kmflag)
	{
	dmu_buf_impl_t *db = vdb;
	bzero(db, sizeof (dmu_buf_impl_t));

	mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL);
	rw_init(&db->db_rwlock, NULL, RW_DEFAULT, NULL);
	cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL);
	multilist_link_init(&db->db_cache_link);
	zfs_refcount_create(&db->db_holds);

	return (0);
	}

	/* ARGSUSED */
	static void
	dbuf_dest(void vdb, void unused)
	{
	dmu_buf_impl_t *db = vdb;
	mutex_destroy(&db->db_mtx);
	rw_destroy(&db->db_rwlock);
	cv_destroy(&db->db_changed);
	ASSERT(!multilist_link_active(&db->db_cache_link));
	zfs_refcount_destroy(&db->db_holds);
	}

	/*
	* dbuf hash table routines
	*/
	static dbuf_hash_table_t dbuf_hash_table;

	/*
	* We use Cityhash for this. It's fast, and has good hash properties without
	* requiring any large static buffers.
	*/
	static uint64_t
	dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid)
	{
	return (cityhash4((uintptr_t)os, obj, (uint64_t)lvl, blkid));
	}

	#define DTRACE_SET_STATE(db, why) \
	DTRACE_PROBE2(dbuf__state_change, dmu_buf_impl_t *, db, \
	const char *, why)

	#define DBUF_EQUAL(dbuf, os, obj, level, blkid) \
	((dbuf)->db.db_object == (obj) && \
	(dbuf)->db_objset == (os) && \
	(dbuf)->db_level == (level) && \
	(dbuf)->db_blkid == (blkid))

	dmu_buf_impl_t *
	dbuf_find(objset_t *os, uint64_t obj, uint8_t level, uint64_t blkid)
	{
	dbuf_hash_table_t *h = &dbuf_hash_table;
	uint64_t hv;
	uint64_t idx;
	dmu_buf_impl_t *db;

	hv = dbuf_hash(os, obj, level, blkid);
	idx = hv & h->hash_table_mask;

	mutex_enter(DBUF_HASH_MUTEX(h, idx));
	for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) {
	if (DBUF_EQUAL(db, os, obj, level, blkid)) {
	mutex_enter(&db->db_mtx);
	if (db->db_state != DB_EVICTING) {
	mutex_exit(DBUF_HASH_MUTEX(h, idx));
	return (db);
	}
	mutex_exit(&db->db_mtx);
	}
	}
	mutex_exit(DBUF_HASH_MUTEX(h, idx));
	return (NULL);
	}

	static dmu_buf_impl_t *
	dbuf_find_bonus(objset_t *os, uint64_t object)
	{
	dnode_t *dn;
	dmu_buf_impl_t *db = NULL;

	if (dnode_hold(os, object, FTAG, &dn) == 0) {
	rw_enter(&dn->dn_struct_rwlock, RW_READER);
	if (dn->dn_bonus != NULL) {
	db = dn->dn_bonus;
	mutex_enter(&db->db_mtx);
	}
	rw_exit(&dn->dn_struct_rwlock);
	dnode_rele(dn, FTAG);
	}
	return (db);
	}

	/*
	* Insert an entry into the hash table. If there is already an element
	* equal to elem in the hash table, then the already existing element
	* will be returned and the new element will not be inserted.
	* Otherwise returns NULL.
	*/
	static dmu_buf_impl_t *
	dbuf_hash_insert(dmu_buf_impl_t *db)
	{
	dbuf_hash_table_t *h = &dbuf_hash_table;
	objset_t *os = db->db_objset;
	uint64_t obj = db->db.db_object;
	int level = db->db_level;
	uint64_t blkid, hv, idx;
	dmu_buf_impl_t *dbf;
	uint32_t i;

	blkid = db->db_blkid;
	hv = dbuf_hash(os, obj, level, blkid);
	idx = hv & h->hash_table_mask;

	mutex_enter(DBUF_HASH_MUTEX(h, idx));
	for (dbf = h->hash_table[idx], i = 0; dbf != NULL;
	dbf = dbf->db_hash_next, i++) {
	if (DBUF_EQUAL(dbf, os, obj, level, blkid)) {
	mutex_enter(&dbf->db_mtx);
	if (dbf->db_state != DB_EVICTING) {
	mutex_exit(DBUF_HASH_MUTEX(h, idx));
	return (dbf);
	}
	mutex_exit(&dbf->db_mtx);
	}
	}

	if (i > 0) {
	DBUF_STAT_BUMP(hash_collisions);
	if (i == 1)
	DBUF_STAT_BUMP(hash_chains);

	DBUF_STAT_MAX(hash_chain_max, i);
	}

	mutex_enter(&db->db_mtx);
	db->db_hash_next = h->hash_table[idx];
	h->hash_table[idx] = db;
	mutex_exit(DBUF_HASH_MUTEX(h, idx));
	uint64_t he = atomic_inc_64_nv(&dbuf_stats.hash_elements.value.ui64);
	DBUF_STAT_MAX(hash_elements_max, he);

	return (NULL);
	}

	/*
	* This returns whether this dbuf should be stored in the metadata cache, which
	* is based on whether it's from one of the dnode types that store data related
	* to traversing dataset hierarchies.
	*/
	static boolean_t
	dbuf_include_in_metadata_cache(dmu_buf_impl_t *db)
	{
	DB_DNODE_ENTER(db);
	dmu_object_type_t type = DB_DNODE(db)->dn_type;
	DB_DNODE_EXIT(db);

	/* Check if this dbuf is one of the types we care about */
	if (DMU_OT_IS_METADATA_CACHED(type)) {
	/* If we hit this, then we set something up wrong in dmu_ot */
	ASSERT(DMU_OT_IS_METADATA(type));

	/*
	* Sanity check for small-memory systems: don't allocate too
	* much memory for this purpose.
	*/
	if (zfs_refcount_count(
	&dbuf_caches[DB_DBUF_METADATA_CACHE].size) >
	dbuf_metadata_cache_target_bytes()) {
	DBUF_STAT_BUMP(metadata_cache_overflow);
	return (B_FALSE);
	}

	return (B_TRUE);
	}

	return (B_FALSE);
	}

	/*
	* Remove an entry from the hash table. It must be in the EVICTING state.
	*/
	static void
	dbuf_hash_remove(dmu_buf_impl_t *db)
	{
	dbuf_hash_table_t *h = &dbuf_hash_table;
	uint64_t hv, idx;
	dmu_buf_impl_t dbf, *dbp;

	hv = dbuf_hash(db->db_objset, db->db.db_object,
	db->db_level, db->db_blkid);
	idx = hv & h->hash_table_mask;

	/*
	* We mustn't hold db_mtx to maintain lock ordering:
	* DBUF_HASH_MUTEX > db_mtx.
	*/
	ASSERT(zfs_refcount_is_zero(&db->db_holds));
	ASSERT(db->db_state == DB_EVICTING);
	ASSERT(!MUTEX_HELD(&db->db_mtx));

	mutex_enter(DBUF_HASH_MUTEX(h, idx));
	dbp = &h->hash_table[idx];
	while ((dbf = *dbp) != db) {
	dbp = &dbf->db_hash_next;
	ASSERT(dbf != NULL);
	}
	*dbp = db->db_hash_next;
	db->db_hash_next = NULL;
	if (h->hash_table[idx] &&
	h->hash_table[idx]->db_hash_next == NULL)
	DBUF_STAT_BUMPDOWN(hash_chains);
	mutex_exit(DBUF_HASH_MUTEX(h, idx));
	atomic_dec_64(&dbuf_stats.hash_elements.value.ui64);
	}

	typedef enum {
	DBVU_EVICTING,
	DBVU_NOT_EVICTING
	} dbvu_verify_type_t;

	static void
	dbuf_verify_user(dmu_buf_impl_t *db, dbvu_verify_type_t verify_type)
	{
	#ifdef ZFS_DEBUG
	int64_t holds;

	if (db->db_user == NULL)
	return;

	/* Only data blocks support the attachment of user data. */
	ASSERT(db->db_level == 0);

	/* Clients must resolve a dbuf before attaching user data. */
	ASSERT(db->db.db_data != NULL);
	ASSERT3U(db->db_state, ==, DB_CACHED);

	holds = zfs_refcount_count(&db->db_holds);
	if (verify_type == DBVU_EVICTING) {
	/*
	* Immediate eviction occurs when holds == dirtycnt.
	* For normal eviction buffers, holds is zero on
	* eviction, except when dbuf_fix_old_data() calls
	* dbuf_clear_data(). However, the hold count can grow
	* during eviction even though db_mtx is held (see
	* dmu_bonus_hold() for an example), so we can only
	* test the generic invariant that holds >= dirtycnt.
	*/
	ASSERT3U(holds, >=, db->db_dirtycnt);
	} else {
	if (db->db_user_immediate_evict == TRUE)
	ASSERT3U(holds, >=, db->db_dirtycnt);
	else
	ASSERT3U(holds, >, 0);
	}
	#endif
	}

	static void
	dbuf_evict_user(dmu_buf_impl_t *db)
	{
	dmu_buf_user_t *dbu = db->db_user;

	ASSERT(MUTEX_HELD(&db->db_mtx));

	if (dbu == NULL)
	return;

	dbuf_verify_user(db, DBVU_EVICTING);
	db->db_user = NULL;

	#ifdef ZFS_DEBUG
	if (dbu->dbu_clear_on_evict_dbufp != NULL)
	*dbu->dbu_clear_on_evict_dbufp = NULL;
	#endif

	/*
	* There are two eviction callbacks - one that we call synchronously
	* and one that we invoke via a taskq. The async one is useful for
	* avoiding lock order reversals and limiting stack depth.
	*
	* Note that if we have a sync callback but no async callback,
	* it's likely that the sync callback will free the structure
	* containing the dbu. In that case we need to take care to not
	* dereference dbu after calling the sync evict func.
	*/
	boolean_t has_async = (dbu->dbu_evict_func_async != NULL);

	if (dbu->dbu_evict_func_sync != NULL)
	dbu->dbu_evict_func_sync(dbu);

	if (has_async) {
	taskq_dispatch_ent(dbu_evict_taskq, dbu->dbu_evict_func_async,
	dbu, 0, &dbu->dbu_tqent);
	}
	}

	boolean_t
	dbuf_is_metadata(dmu_buf_impl_t *db)
	{
	/*
	* Consider indirect blocks and spill blocks to be meta data.
	*/
	if (db->db_level > 0 \|\| db->db_blkid == DMU_SPILL_BLKID) {
	return (B_TRUE);
	} else {
	boolean_t is_metadata;

	DB_DNODE_ENTER(db);
	is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type);
	DB_DNODE_EXIT(db);

	return (is_metadata);
	}
	}


	/*
	* This function must return indices evenly distributed between all
	* sublists of the multilist. This is needed due to how the dbuf eviction
	* code is laid out; dbuf_evict_thread() assumes dbufs are evenly
	* distributed between all sublists and uses this assumption when
	* deciding which sublist to evict from and how much to evict from it.
	*/
	static unsigned int
	dbuf_cache_multilist_index_func(multilist_t ml, void obj)
	{
	dmu_buf_impl_t *db = obj;

	/*
	* The assumption here, is the hash value for a given
	* dmu_buf_impl_t will remain constant throughout it's lifetime
	* (i.e. it's objset, object, level and blkid fields don't change).
	* Thus, we don't need to store the dbuf's sublist index
	* on insertion, as this index can be recalculated on removal.
	*
	* Also, the low order bits of the hash value are thought to be
	* distributed evenly. Otherwise, in the case that the multilist
	* has a power of two number of sublists, each sublists' usage
	* would not be evenly distributed. In this context full 64bit
	* division would be a waste of time, so limit it to 32 bits.
	*/
	return ((unsigned int)dbuf_hash(db->db_objset, db->db.db_object,
	db->db_level, db->db_blkid) %
	multilist_get_num_sublists(ml));
	}

	/*
	* The target size of the dbuf cache can grow with the ARC target,
	* unless limited by the tunable dbuf_cache_max_bytes.
	*/
	static inline unsigned long
	dbuf_cache_target_bytes(void)
	{
	return (MIN(dbuf_cache_max_bytes,
	arc_target_bytes() >> dbuf_cache_shift));
	}

	/*
	* The target size of the dbuf metadata cache can grow with the ARC target,
	* unless limited by the tunable dbuf_metadata_cache_max_bytes.
	*/
	static inline unsigned long
	dbuf_metadata_cache_target_bytes(void)
	{
	return (MIN(dbuf_metadata_cache_max_bytes,
	arc_target_bytes() >> dbuf_metadata_cache_shift));
	}

	static inline uint64_t
	dbuf_cache_hiwater_bytes(void)
	{
	uint64_t dbuf_cache_target = dbuf_cache_target_bytes();
	return (dbuf_cache_target +
	(dbuf_cache_target * dbuf_cache_hiwater_pct) / 100);
	}

	static inline uint64_t
	dbuf_cache_lowater_bytes(void)
	{
	uint64_t dbuf_cache_target = dbuf_cache_target_bytes();
	return (dbuf_cache_target -
	(dbuf_cache_target * dbuf_cache_lowater_pct) / 100);
	}

	static inline boolean_t
	dbuf_cache_above_lowater(void)
	{
	return (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) >
	dbuf_cache_lowater_bytes());
	}

	/*
	* Evict the oldest eligible dbuf from the dbuf cache.
	*/
	static void
	dbuf_evict_one(void)
	{
	int idx = multilist_get_random_index(&dbuf_caches[DB_DBUF_CACHE].cache);
	multilist_sublist_t *mls = multilist_sublist_lock(
	&dbuf_caches[DB_DBUF_CACHE].cache, idx);

	ASSERT(!MUTEX_HELD(&dbuf_evict_lock));

	dmu_buf_impl_t *db = multilist_sublist_tail(mls);
	while (db != NULL && mutex_tryenter(&db->db_mtx) == 0) {
	db = multilist_sublist_prev(mls, db);
	}

	DTRACE_PROBE2(dbuf__evict__one, dmu_buf_impl_t *, db,
	multilist_sublist_t *, mls);

	if (db != NULL) {
	multilist_sublist_remove(mls, db);
	multilist_sublist_unlock(mls);
	(void) zfs_refcount_remove_many(
	&dbuf_caches[DB_DBUF_CACHE].size, db->db.db_size, db);
	DBUF_STAT_BUMPDOWN(cache_levels[db->db_level]);
	DBUF_STAT_BUMPDOWN(cache_count);
	DBUF_STAT_DECR(cache_levels_bytes[db->db_level],
	db->db.db_size);
	ASSERT3U(db->db_caching_status, ==, DB_DBUF_CACHE);
	db->db_caching_status = DB_NO_CACHE;
	dbuf_destroy(db);
	DBUF_STAT_BUMP(cache_total_evicts);
	} else {
	multilist_sublist_unlock(mls);
	}
	}

	/*
	* The dbuf evict thread is responsible for aging out dbufs from the
	* cache. Once the cache has reached it's maximum size, dbufs are removed
	* and destroyed. The eviction thread will continue running until the size
	* of the dbuf cache is at or below the maximum size. Once the dbuf is aged
	* out of the cache it is destroyed and becomes eligible for arc eviction.
	*/
	/* ARGSUSED */
	static void
	dbuf_evict_thread(void *unused)
	{
	callb_cpr_t cpr;

	CALLB_CPR_INIT(&cpr, &dbuf_evict_lock, callb_generic_cpr, FTAG);

	mutex_enter(&dbuf_evict_lock);
	while (!dbuf_evict_thread_exit) {
	while (!dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) {
	CALLB_CPR_SAFE_BEGIN(&cpr);
	(void) cv_timedwait_idle_hires(&dbuf_evict_cv,
	&dbuf_evict_lock, SEC2NSEC(1), MSEC2NSEC(1), 0);
	CALLB_CPR_SAFE_END(&cpr, &dbuf_evict_lock);
	}
	mutex_exit(&dbuf_evict_lock);

	/*
	* Keep evicting as long as we're above the low water mark
	* for the cache. We do this without holding the locks to
	* minimize lock contention.
	*/
	while (dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) {
	dbuf_evict_one();
	}

	mutex_enter(&dbuf_evict_lock);
	}

	dbuf_evict_thread_exit = B_FALSE;
	cv_broadcast(&dbuf_evict_cv);
	CALLB_CPR_EXIT(&cpr); /* drops dbuf_evict_lock */
	thread_exit();
	}

	/*
	* Wake up the dbuf eviction thread if the dbuf cache is at its max size.
	* If the dbuf cache is at its high water mark, then evict a dbuf from the
	* dbuf cache using the callers context.
	*/
	static void
	dbuf_evict_notify(uint64_t size)
	{
	/*
	* We check if we should evict without holding the dbuf_evict_lock,
	* because it's OK to occasionally make the wrong decision here,
	* and grabbing the lock results in massive lock contention.
	*/
	if (size > dbuf_cache_target_bytes()) {
	if (size > dbuf_cache_hiwater_bytes())
	dbuf_evict_one();
	cv_signal(&dbuf_evict_cv);
	}
	}

	static int
	dbuf_kstat_update(kstat_t *ksp, int rw)
	{
	dbuf_stats_t *ds = ksp->ks_data;

	if (rw == KSTAT_WRITE)
	return (SET_ERROR(EACCES));

	ds->cache_count.value.ui64 =
	wmsum_value(&dbuf_sums.cache_count);
	ds->cache_size_bytes.value.ui64 =
	zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size);
	ds->cache_target_bytes.value.ui64 = dbuf_cache_target_bytes();
	ds->cache_hiwater_bytes.value.ui64 = dbuf_cache_hiwater_bytes();
	ds->cache_lowater_bytes.value.ui64 = dbuf_cache_lowater_bytes();
	ds->cache_total_evicts.value.ui64 =
	wmsum_value(&dbuf_sums.cache_total_evicts);
	for (int i = 0; i < DN_MAX_LEVELS; i++) {
	ds->cache_levels[i].value.ui64 =
	wmsum_value(&dbuf_sums.cache_levels[i]);
	ds->cache_levels_bytes[i].value.ui64 =
	wmsum_value(&dbuf_sums.cache_levels_bytes[i]);
	}
	ds->hash_hits.value.ui64 =
	wmsum_value(&dbuf_sums.hash_hits);
	ds->hash_misses.value.ui64 =
	wmsum_value(&dbuf_sums.hash_misses);
	ds->hash_collisions.value.ui64 =
	wmsum_value(&dbuf_sums.hash_collisions);
	ds->hash_chains.value.ui64 =
	wmsum_value(&dbuf_sums.hash_chains);
	ds->hash_insert_race.value.ui64 =
	wmsum_value(&dbuf_sums.hash_insert_race);
	ds->metadata_cache_count.value.ui64 =
	wmsum_value(&dbuf_sums.metadata_cache_count);
	ds->metadata_cache_size_bytes.value.ui64 = zfs_refcount_count(
	&dbuf_caches[DB_DBUF_METADATA_CACHE].size);
	ds->metadata_cache_overflow.value.ui64 =
	wmsum_value(&dbuf_sums.metadata_cache_overflow);
	return (0);
	}

	void
	dbuf_init(void)
	{
	uint64_t hsize = 1ULL << 16;
	dbuf_hash_table_t *h = &dbuf_hash_table;
	int i;

	/*
	- * The hash table is big enough to fill all of physical memory
	+ * The hash table is big enough to fill one eighth of physical memory
	* with an average block size of zfs_arc_average_blocksize (default 8K).
	* By default, the table will take up
	* totalmem * sizeof(void*) / 8K (1MB per GB with 8-byte pointers).
	*/
	- while (hsize * zfs_arc_average_blocksize < physmem * PAGESIZE)
	+ while (hsize * zfs_arc_average_blocksize < arc_all_memory() / 8)
	hsize <<= 1;

	retry:
	h->hash_table_mask = hsize - 1;
	#if defined(_KERNEL)
	/*
	* Large allocations which do not require contiguous pages
	* should be using vmem_alloc() in the linux kernel
	*/
	h->hash_table = vmem_zalloc(hsize * sizeof (void *), KM_SLEEP);
	#else
	h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP);
	#endif
	if (h->hash_table == NULL) {
	/* XXX - we should really return an error instead of assert */
	ASSERT(hsize > (1ULL << 10));
	hsize >>= 1;
	goto retry;
	}

	dbuf_kmem_cache = kmem_cache_create("dmu_buf_impl_t",
	sizeof (dmu_buf_impl_t),
	0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0);

	for (i = 0; i < DBUF_MUTEXES; i++)
	mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL);

	dbuf_stats_init(h);

	/*
	* All entries are queued via taskq_dispatch_ent(), so min/maxalloc
	* configuration is not required.
	*/
	dbu_evict_taskq = taskq_create("dbu_evict", 1, defclsyspri, 0, 0, 0);

	for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) {
	multilist_create(&dbuf_caches[dcs].cache,
	sizeof (dmu_buf_impl_t),
	offsetof(dmu_buf_impl_t, db_cache_link),
	dbuf_cache_multilist_index_func);
	zfs_refcount_create(&dbuf_caches[dcs].size);
	}

	dbuf_evict_thread_exit = B_FALSE;
	mutex_init(&dbuf_evict_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&dbuf_evict_cv, NULL, CV_DEFAULT, NULL);
	dbuf_cache_evict_thread = thread_create(NULL, 0, dbuf_evict_thread,
	NULL, 0, &p0, TS_RUN, minclsyspri);

	wmsum_init(&dbuf_sums.cache_count, 0);
	wmsum_init(&dbuf_sums.cache_total_evicts, 0);
	for (i = 0; i < DN_MAX_LEVELS; i++) {
	wmsum_init(&dbuf_sums.cache_levels[i], 0);
	wmsum_init(&dbuf_sums.cache_levels_bytes[i], 0);
	}
	wmsum_init(&dbuf_sums.hash_hits, 0);
	wmsum_init(&dbuf_sums.hash_misses, 0);
	wmsum_init(&dbuf_sums.hash_collisions, 0);
	wmsum_init(&dbuf_sums.hash_chains, 0);
	wmsum_init(&dbuf_sums.hash_insert_race, 0);
	wmsum_init(&dbuf_sums.metadata_cache_count, 0);
	wmsum_init(&dbuf_sums.metadata_cache_overflow, 0);

	dbuf_ksp = kstat_create("zfs", 0, "dbufstats", "misc",
	KSTAT_TYPE_NAMED, sizeof (dbuf_stats) / sizeof (kstat_named_t),
	KSTAT_FLAG_VIRTUAL);
	if (dbuf_ksp != NULL) {
	for (i = 0; i < DN_MAX_LEVELS; i++) {
	snprintf(dbuf_stats.cache_levels[i].name,
	KSTAT_STRLEN, "cache_level_%d", i);
	dbuf_stats.cache_levels[i].data_type =
	KSTAT_DATA_UINT64;
	snprintf(dbuf_stats.cache_levels_bytes[i].name,
	KSTAT_STRLEN, "cache_level_%d_bytes", i);
	dbuf_stats.cache_levels_bytes[i].data_type =
	KSTAT_DATA_UINT64;
	}
	dbuf_ksp->ks_data = &dbuf_stats;
	dbuf_ksp->ks_update = dbuf_kstat_update;
	kstat_install(dbuf_ksp);
	}
	}

	void
	dbuf_fini(void)
	{
	dbuf_hash_table_t *h = &dbuf_hash_table;
	int i;

	dbuf_stats_destroy();

	for (i = 0; i < DBUF_MUTEXES; i++)
	mutex_destroy(&h->hash_mutexes[i]);
	#if defined(_KERNEL)
	/*
	* Large allocations which do not require contiguous pages
	* should be using vmem_free() in the linux kernel
	*/
	vmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *));
	#else
	kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *));
	#endif
	kmem_cache_destroy(dbuf_kmem_cache);
	taskq_destroy(dbu_evict_taskq);

	mutex_enter(&dbuf_evict_lock);
	dbuf_evict_thread_exit = B_TRUE;
	while (dbuf_evict_thread_exit) {
	cv_signal(&dbuf_evict_cv);
	cv_wait(&dbuf_evict_cv, &dbuf_evict_lock);
	}
	mutex_exit(&dbuf_evict_lock);

	mutex_destroy(&dbuf_evict_lock);
	cv_destroy(&dbuf_evict_cv);

	for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) {
	zfs_refcount_destroy(&dbuf_caches[dcs].size);
	multilist_destroy(&dbuf_caches[dcs].cache);
	}

	if (dbuf_ksp != NULL) {
	kstat_delete(dbuf_ksp);
	dbuf_ksp = NULL;
	}

	wmsum_fini(&dbuf_sums.cache_count);
	wmsum_fini(&dbuf_sums.cache_total_evicts);
	for (i = 0; i < DN_MAX_LEVELS; i++) {
	wmsum_fini(&dbuf_sums.cache_levels[i]);
	wmsum_fini(&dbuf_sums.cache_levels_bytes[i]);
	}
	wmsum_fini(&dbuf_sums.hash_hits);
	wmsum_fini(&dbuf_sums.hash_misses);
	wmsum_fini(&dbuf_sums.hash_collisions);
	wmsum_fini(&dbuf_sums.hash_chains);
	wmsum_fini(&dbuf_sums.hash_insert_race);
	wmsum_fini(&dbuf_sums.metadata_cache_count);
	wmsum_fini(&dbuf_sums.metadata_cache_overflow);
	}

	/*
	* Other stuff.
	*/

	#ifdef ZFS_DEBUG
	static void
	dbuf_verify(dmu_buf_impl_t *db)
	{
	dnode_t *dn;
	dbuf_dirty_record_t *dr;
	uint32_t txg_prev;

	ASSERT(MUTEX_HELD(&db->db_mtx));

	if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY))
	return;

	ASSERT(db->db_objset != NULL);
	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	if (dn == NULL) {
	ASSERT(db->db_parent == NULL);
	ASSERT(db->db_blkptr == NULL);
	} else {
	ASSERT3U(db->db.db_object, ==, dn->dn_object);
	ASSERT3P(db->db_objset, ==, dn->dn_objset);
	ASSERT3U(db->db_level, <, dn->dn_nlevels);
	ASSERT(db->db_blkid == DMU_BONUS_BLKID \|\|
	db->db_blkid == DMU_SPILL_BLKID \|\|
	!avl_is_empty(&dn->dn_dbufs));
	}
	if (db->db_blkid == DMU_BONUS_BLKID) {
	ASSERT(dn != NULL);
	ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen);
	ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID);
	} else if (db->db_blkid == DMU_SPILL_BLKID) {
	ASSERT(dn != NULL);
	ASSERT0(db->db.db_offset);
	} else {
	ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size);
	}

	if ((dr = list_head(&db->db_dirty_records)) != NULL) {
	ASSERT(dr->dr_dbuf == db);
	txg_prev = dr->dr_txg;
	for (dr = list_next(&db->db_dirty_records, dr); dr != NULL;
	dr = list_next(&db->db_dirty_records, dr)) {
	ASSERT(dr->dr_dbuf == db);
	ASSERT(txg_prev > dr->dr_txg);
	txg_prev = dr->dr_txg;
	}
	}

	/*
	* We can't assert that db_size matches dn_datablksz because it
	* can be momentarily different when another thread is doing
	* dnode_set_blksz().
	*/
	if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) {
	dr = db->db_data_pending;
	/*
	* It should only be modified in syncing context, so
	* make sure we only have one copy of the data.
	*/
	ASSERT(dr == NULL \|\| dr->dt.dl.dr_data == db->db_buf);
	}

	/* verify db->db_blkptr */
	if (db->db_blkptr) {
	if (db->db_parent == dn->dn_dbuf) {
	/* db is pointed to by the dnode */
	/* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */
	if (DMU_OBJECT_IS_SPECIAL(db->db.db_object))
	ASSERT(db->db_parent == NULL);
	else
	ASSERT(db->db_parent != NULL);
	if (db->db_blkid != DMU_SPILL_BLKID)
	ASSERT3P(db->db_blkptr, ==,
	&dn->dn_phys->dn_blkptr[db->db_blkid]);
	} else {
	/* db is pointed to by an indirect block */
	int epb __maybe_unused = db->db_parent->db.db_size >>
	SPA_BLKPTRSHIFT;
	ASSERT3U(db->db_parent->db_level, ==, db->db_level+1);
	ASSERT3U(db->db_parent->db.db_object, ==,
	db->db.db_object);
	/*
	* dnode_grow_indblksz() can make this fail if we don't
	* have the parent's rwlock. XXX indblksz no longer
	* grows. safe to do this now?
	*/
	if (RW_LOCK_HELD(&db->db_parent->db_rwlock)) {
	ASSERT3P(db->db_blkptr, ==,
	((blkptr_t *)db->db_parent->db.db_data +
	db->db_blkid % epb));
	}
	}
	}
	if ((db->db_blkptr == NULL \|\| BP_IS_HOLE(db->db_blkptr)) &&
	(db->db_buf == NULL \|\| db->db_buf->b_data) &&
	db->db.db_data && db->db_blkid != DMU_BONUS_BLKID &&
	db->db_state != DB_FILL && !dn->dn_free_txg) {
	/*
	* If the blkptr isn't set but they have nonzero data,
	* it had better be dirty, otherwise we'll lose that
	* data when we evict this buffer.
	*
	* There is an exception to this rule for indirect blocks; in
	* this case, if the indirect block is a hole, we fill in a few
	* fields on each of the child blocks (importantly, birth time)
	* to prevent hole birth times from being lost when you
	* partially fill in a hole.
	*/
	if (db->db_dirtycnt == 0) {
	if (db->db_level == 0) {
	uint64_t *buf = db->db.db_data;
	int i;

	for (i = 0; i < db->db.db_size >> 3; i++) {
	ASSERT(buf[i] == 0);
	}
	} else {
	blkptr_t *bps = db->db.db_data;
	ASSERT3U(1 << DB_DNODE(db)->dn_indblkshift, ==,
	db->db.db_size);
	/*
	* We want to verify that all the blkptrs in the
	* indirect block are holes, but we may have
	* automatically set up a few fields for them.
	* We iterate through each blkptr and verify
	* they only have those fields set.
	*/
	for (int i = 0;
	i < db->db.db_size / sizeof (blkptr_t);
	i++) {
	blkptr_t *bp = &bps[i];
	ASSERT(ZIO_CHECKSUM_IS_ZERO(
	&bp->blk_cksum));
	ASSERT(
	DVA_IS_EMPTY(&bp->blk_dva[0]) &&
	DVA_IS_EMPTY(&bp->blk_dva[1]) &&
	DVA_IS_EMPTY(&bp->blk_dva[2]));
	ASSERT0(bp->blk_fill);
	ASSERT0(bp->blk_pad[0]);
	ASSERT0(bp->blk_pad[1]);
	ASSERT(!BP_IS_EMBEDDED(bp));
	ASSERT(BP_IS_HOLE(bp));
	ASSERT0(bp->blk_phys_birth);
	}
	}
	}
	}
	DB_DNODE_EXIT(db);
	}
	#endif

	static void
	dbuf_clear_data(dmu_buf_impl_t *db)
	{
	ASSERT(MUTEX_HELD(&db->db_mtx));
	dbuf_evict_user(db);
	ASSERT3P(db->db_buf, ==, NULL);
	db->db.db_data = NULL;
	if (db->db_state != DB_NOFILL) {
	db->db_state = DB_UNCACHED;
	DTRACE_SET_STATE(db, "clear data");
	}
	}

	static void
	dbuf_set_data(dmu_buf_impl_t db, arc_buf_t buf)
	{
	ASSERT(MUTEX_HELD(&db->db_mtx));
	ASSERT(buf != NULL);

	db->db_buf = buf;
	ASSERT(buf->b_data != NULL);
	db->db.db_data = buf->b_data;
	}

	static arc_buf_t *
	dbuf_alloc_arcbuf(dmu_buf_impl_t *db)
	{
	spa_t *spa = db->db_objset->os_spa;

	return (arc_alloc_buf(spa, db, DBUF_GET_BUFC_TYPE(db), db->db.db_size));
	}

	/*
	* Loan out an arc_buf for read. Return the loaned arc_buf.
	*/
	arc_buf_t *
	dbuf_loan_arcbuf(dmu_buf_impl_t *db)
	{
	arc_buf_t *abuf;

	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
	mutex_enter(&db->db_mtx);
	if (arc_released(db->db_buf) \|\| zfs_refcount_count(&db->db_holds) > 1) {
	int blksz = db->db.db_size;
	spa_t *spa = db->db_objset->os_spa;

	mutex_exit(&db->db_mtx);
	abuf = arc_loan_buf(spa, B_FALSE, blksz);
	bcopy(db->db.db_data, abuf->b_data, blksz);
	} else {
	abuf = db->db_buf;
	arc_loan_inuse_buf(abuf, db);
	db->db_buf = NULL;
	dbuf_clear_data(db);
	mutex_exit(&db->db_mtx);
	}
	return (abuf);
	}

	/*
	* Calculate which level n block references the data at the level 0 offset
	* provided.
	*/
	uint64_t
	dbuf_whichblock(const dnode_t *dn, const int64_t level, const uint64_t offset)
	{
	if (dn->dn_datablkshift != 0 && dn->dn_indblkshift != 0) {
	/*
	* The level n blkid is equal to the level 0 blkid divided by
	* the number of level 0s in a level n block.
	*
	* The level 0 blkid is offset >> datablkshift =
	* offset / 2^datablkshift.
	*
	* The number of level 0s in a level n is the number of block
	* pointers in an indirect block, raised to the power of level.
	* This is 2^(indblkshift - SPA_BLKPTRSHIFT)^level =
	* 2^(level*(indblkshift - SPA_BLKPTRSHIFT)).
	*
	* Thus, the level n blkid is: offset /
	* ((2^datablkshift)(2^(level(indblkshift-SPA_BLKPTRSHIFT))))
	* = offset / 2^(datablkshift + level *
	* (indblkshift - SPA_BLKPTRSHIFT))
	* = offset >> (datablkshift + level *
	* (indblkshift - SPA_BLKPTRSHIFT))
	*/

	const unsigned exp = dn->dn_datablkshift +
	level * (dn->dn_indblkshift - SPA_BLKPTRSHIFT);

	if (exp >= 8 * sizeof (offset)) {
	/* This only happens on the highest indirection level */
	ASSERT3U(level, ==, dn->dn_nlevels - 1);
	return (0);
	}

	ASSERT3U(exp, <, 8 * sizeof (offset));

	return (offset >> exp);
	} else {
	ASSERT3U(offset, <, dn->dn_datablksz);
	return (0);
	}
	}

	/*
	* This function is used to lock the parent of the provided dbuf. This should be
	* used when modifying or reading db_blkptr.
	*/
	db_lock_type_t
	dmu_buf_lock_parent(dmu_buf_impl_t db, krw_t rw, void tag)
	{
	enum db_lock_type ret = DLT_NONE;
	if (db->db_parent != NULL) {
	rw_enter(&db->db_parent->db_rwlock, rw);
	ret = DLT_PARENT;
	} else if (dmu_objset_ds(db->db_objset) != NULL) {
	rrw_enter(&dmu_objset_ds(db->db_objset)->ds_bp_rwlock, rw,
	tag);
	ret = DLT_OBJSET;
	}
	/*
	* We only return a DLT_NONE lock when it's the top-most indirect block
	* of the meta-dnode of the MOS.
	*/
	return (ret);
	}

	/*
	* We need to pass the lock type in because it's possible that the block will
	* move from being the topmost indirect block in a dnode (and thus, have no
	* parent) to not the top-most via an indirection increase. This would cause a
	* panic if we didn't pass the lock type in.
	*/
	void
	dmu_buf_unlock_parent(dmu_buf_impl_t db, db_lock_type_t type, void tag)
	{
	if (type == DLT_PARENT)
	rw_exit(&db->db_parent->db_rwlock);
	else if (type == DLT_OBJSET)
	rrw_exit(&dmu_objset_ds(db->db_objset)->ds_bp_rwlock, tag);
	}

	static void
	dbuf_read_done(zio_t zio, const zbookmark_phys_t zb, const blkptr_t *bp,
	arc_buf_t buf, void vdb)
	{
	dmu_buf_impl_t *db = vdb;

	mutex_enter(&db->db_mtx);
	ASSERT3U(db->db_state, ==, DB_READ);
	/*
	* All reads are synchronous, so we must have a hold on the dbuf
	*/
	ASSERT(zfs_refcount_count(&db->db_holds) > 0);
	ASSERT(db->db_buf == NULL);
	ASSERT(db->db.db_data == NULL);
	if (buf == NULL) {
	/* i/o error */
	ASSERT(zio == NULL \|\| zio->io_error != 0);
	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
	ASSERT3P(db->db_buf, ==, NULL);
	db->db_state = DB_UNCACHED;
	DTRACE_SET_STATE(db, "i/o error");
	} else if (db->db_level == 0 && db->db_freed_in_flight) {
	/* freed in flight */
	ASSERT(zio == NULL \|\| zio->io_error == 0);
	arc_release(buf, db);
	bzero(buf->b_data, db->db.db_size);
	arc_buf_freeze(buf);
	db->db_freed_in_flight = FALSE;
	dbuf_set_data(db, buf);
	db->db_state = DB_CACHED;
	DTRACE_SET_STATE(db, "freed in flight");
	} else {
	/* success */
	ASSERT(zio == NULL \|\| zio->io_error == 0);
	dbuf_set_data(db, buf);
	db->db_state = DB_CACHED;
	DTRACE_SET_STATE(db, "successful read");
	}
	cv_broadcast(&db->db_changed);
	dbuf_rele_and_unlock(db, NULL, B_FALSE);
	}

	/*
	* Shortcut for performing reads on bonus dbufs. Returns
	* an error if we fail to verify the dnode associated with
	* a decrypted block. Otherwise success.
	*/
	static int
	dbuf_read_bonus(dmu_buf_impl_t db, dnode_t dn, uint32_t flags)
	{
	int bonuslen, max_bonuslen, err;

	err = dbuf_read_verify_dnode_crypt(db, flags);
	if (err)
	return (err);

	bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen);
	max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
	ASSERT(MUTEX_HELD(&db->db_mtx));
	ASSERT(DB_DNODE_HELD(db));
	ASSERT3U(bonuslen, <=, db->db.db_size);
	db->db.db_data = kmem_alloc(max_bonuslen, KM_SLEEP);
	arc_space_consume(max_bonuslen, ARC_SPACE_BONUS);
	if (bonuslen < max_bonuslen)
	bzero(db->db.db_data, max_bonuslen);
	if (bonuslen)
	bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen);
	db->db_state = DB_CACHED;
	DTRACE_SET_STATE(db, "bonus buffer filled");
	return (0);
	}

	static void
	dbuf_handle_indirect_hole(dmu_buf_impl_t db, dnode_t dn)
	{
	blkptr_t *bps = db->db.db_data;
	uint32_t indbs = 1ULL << dn->dn_indblkshift;
	int n_bps = indbs >> SPA_BLKPTRSHIFT;

	for (int i = 0; i < n_bps; i++) {
	blkptr_t *bp = &bps[i];

	ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, indbs);
	BP_SET_LSIZE(bp, BP_GET_LEVEL(db->db_blkptr) == 1 ?
	dn->dn_datablksz : BP_GET_LSIZE(db->db_blkptr));
	BP_SET_TYPE(bp, BP_GET_TYPE(db->db_blkptr));
	BP_SET_LEVEL(bp, BP_GET_LEVEL(db->db_blkptr) - 1);
	BP_SET_BIRTH(bp, db->db_blkptr->blk_birth, 0);
	}
	}

	/*
	* Handle reads on dbufs that are holes, if necessary. This function
	* requires that the dbuf's mutex is held. Returns success (0) if action
	* was taken, ENOENT if no action was taken.
	*/
	static int
	dbuf_read_hole(dmu_buf_impl_t db, dnode_t dn, uint32_t flags)
	{
	ASSERT(MUTEX_HELD(&db->db_mtx));

	int is_hole = db->db_blkptr == NULL \|\| BP_IS_HOLE(db->db_blkptr);
	/*
	* For level 0 blocks only, if the above check fails:
	* Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync()
	* processes the delete record and clears the bp while we are waiting
	* for the dn_mtx (resulting in a "no" from block_freed).
	*/
	if (!is_hole && db->db_level == 0) {
	is_hole = dnode_block_freed(dn, db->db_blkid) \|\|
	BP_IS_HOLE(db->db_blkptr);
	}

	if (is_hole) {
	dbuf_set_data(db, dbuf_alloc_arcbuf(db));
	bzero(db->db.db_data, db->db.db_size);

	if (db->db_blkptr != NULL && db->db_level > 0 &&
	BP_IS_HOLE(db->db_blkptr) &&
	db->db_blkptr->blk_birth != 0) {
	dbuf_handle_indirect_hole(db, dn);
	}
	db->db_state = DB_CACHED;
	DTRACE_SET_STATE(db, "hole read satisfied");
	return (0);
	}
	return (ENOENT);
	}

	/*
	* This function ensures that, when doing a decrypting read of a block,
	* we make sure we have decrypted the dnode associated with it. We must do
	* this so that we ensure we are fully authenticating the checksum-of-MACs
	* tree from the root of the objset down to this block. Indirect blocks are
	* always verified against their secure checksum-of-MACs assuming that the
	* dnode containing them is correct. Now that we are doing a decrypting read,
	* we can be sure that the key is loaded and verify that assumption. This is
	* especially important considering that we always read encrypted dnode
	* blocks as raw data (without verifying their MACs) to start, and
	* decrypt / authenticate them when we need to read an encrypted bonus buffer.
	*/
	static int
	dbuf_read_verify_dnode_crypt(dmu_buf_impl_t *db, uint32_t flags)
	{
	int err = 0;
	objset_t *os = db->db_objset;
	arc_buf_t *dnode_abuf;
	dnode_t *dn;
	zbookmark_phys_t zb;

	ASSERT(MUTEX_HELD(&db->db_mtx));

	if (!os->os_encrypted \|\| os->os_raw_receive \|\|
	(flags & DB_RF_NO_DECRYPT) != 0)
	return (0);

	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	dnode_abuf = (dn->dn_dbuf != NULL) ? dn->dn_dbuf->db_buf : NULL;

	if (dnode_abuf == NULL \|\| !arc_is_encrypted(dnode_abuf)) {
	DB_DNODE_EXIT(db);
	return (0);
	}

	SET_BOOKMARK(&zb, dmu_objset_id(os),
	DMU_META_DNODE_OBJECT, 0, dn->dn_dbuf->db_blkid);
	err = arc_untransform(dnode_abuf, os->os_spa, &zb, B_TRUE);

	/*
	* An error code of EACCES tells us that the key is still not
	* available. This is ok if we are only reading authenticated
	* (and therefore non-encrypted) blocks.
	*/
	if (err == EACCES && ((db->db_blkid != DMU_BONUS_BLKID &&
	!DMU_OT_IS_ENCRYPTED(dn->dn_type)) \|\|
	(db->db_blkid == DMU_BONUS_BLKID &&
	!DMU_OT_IS_ENCRYPTED(dn->dn_bonustype))))
	err = 0;

	DB_DNODE_EXIT(db);

	return (err);
	}

	/*
	* Drops db_mtx and the parent lock specified by dblt and tag before
	* returning.
	*/
	static int
	dbuf_read_impl(dmu_buf_impl_t db, zio_t zio, uint32_t flags,
	db_lock_type_t dblt, void *tag)
	{
	dnode_t *dn;
	zbookmark_phys_t zb;
	uint32_t aflags = ARC_FLAG_NOWAIT;
	int err, zio_flags;
	boolean_t bonus_read;

	err = zio_flags = 0;
	bonus_read = B_FALSE;
	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
	ASSERT(MUTEX_HELD(&db->db_mtx));
	ASSERT(db->db_state == DB_UNCACHED);
	ASSERT(db->db_buf == NULL);
	ASSERT(db->db_parent == NULL \|\|
	RW_LOCK_HELD(&db->db_parent->db_rwlock));

	if (db->db_blkid == DMU_BONUS_BLKID) {
	err = dbuf_read_bonus(db, dn, flags);
	goto early_unlock;
	}

	err = dbuf_read_hole(db, dn, flags);
	if (err == 0)
	goto early_unlock;

	/*
	* Any attempt to read a redacted block should result in an error. This
	* will never happen under normal conditions, but can be useful for
	* debugging purposes.
	*/
	if (BP_IS_REDACTED(db->db_blkptr)) {
	ASSERT(dsl_dataset_feature_is_active(
	db->db_objset->os_dsl_dataset,
	SPA_FEATURE_REDACTED_DATASETS));
	err = SET_ERROR(EIO);
	goto early_unlock;
	}

	SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
	db->db.db_object, db->db_level, db->db_blkid);

	/*
	* All bps of an encrypted os should have the encryption bit set.
	* If this is not true it indicates tampering and we report an error.
	*/
	if (db->db_objset->os_encrypted && !BP_USES_CRYPT(db->db_blkptr)) {
	spa_log_error(db->db_objset->os_spa, &zb);
	zfs_panic_recover("unencrypted block in encrypted "
	"object set %llu", dmu_objset_id(db->db_objset));
	err = SET_ERROR(EIO);
	goto early_unlock;
	}

	err = dbuf_read_verify_dnode_crypt(db, flags);
	if (err != 0)
	goto early_unlock;

	DB_DNODE_EXIT(db);

	db->db_state = DB_READ;
	DTRACE_SET_STATE(db, "read issued");
	mutex_exit(&db->db_mtx);

	if (DBUF_IS_L2CACHEABLE(db))
	aflags \|= ARC_FLAG_L2CACHE;

	dbuf_add_ref(db, NULL);

	zio_flags = (flags & DB_RF_CANFAIL) ?
	ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED;

	if ((flags & DB_RF_NO_DECRYPT) && BP_IS_PROTECTED(db->db_blkptr))
	zio_flags \|= ZIO_FLAG_RAW;
	/*
	* The zio layer will copy the provided blkptr later, but we need to
	* do this now so that we can release the parent's rwlock. We have to
	* do that now so that if dbuf_read_done is called synchronously (on
	* an l1 cache hit) we don't acquire the db_mtx while holding the
	* parent's rwlock, which would be a lock ordering violation.
	*/
	blkptr_t bp = *db->db_blkptr;
	dmu_buf_unlock_parent(db, dblt, tag);
	(void) arc_read(zio, db->db_objset->os_spa, &bp,
	dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, zio_flags,
	&aflags, &zb);
	return (err);
	early_unlock:
	DB_DNODE_EXIT(db);
	mutex_exit(&db->db_mtx);
	dmu_buf_unlock_parent(db, dblt, tag);
	return (err);
	}

	/*
	* This is our just-in-time copy function. It makes a copy of buffers that
	* have been modified in a previous transaction group before we access them in
	* the current active group.
	*
	* This function is used in three places: when we are dirtying a buffer for the
	* first time in a txg, when we are freeing a range in a dnode that includes
	* this buffer, and when we are accessing a buffer which was received compressed
	* and later referenced in a WRITE_BYREF record.
	*
	* Note that when we are called from dbuf_free_range() we do not put a hold on
	* the buffer, we just traverse the active dbuf list for the dnode.
	*/
	static void
	dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg)
	{
	dbuf_dirty_record_t *dr = list_head(&db->db_dirty_records);

	ASSERT(MUTEX_HELD(&db->db_mtx));
	ASSERT(db->db.db_data != NULL);
	ASSERT(db->db_level == 0);
	ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT);

	if (dr == NULL \|\|
	(dr->dt.dl.dr_data !=
	((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf)))
	return;

	/*
	* If the last dirty record for this dbuf has not yet synced
	* and its referencing the dbuf data, either:
	* reset the reference to point to a new copy,
	* or (if there a no active holders)
	* just null out the current db_data pointer.
	*/
	ASSERT3U(dr->dr_txg, >=, txg - 2);
	if (db->db_blkid == DMU_BONUS_BLKID) {
	dnode_t *dn = DB_DNODE(db);
	int bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
	dr->dt.dl.dr_data = kmem_alloc(bonuslen, KM_SLEEP);
	arc_space_consume(bonuslen, ARC_SPACE_BONUS);
	bcopy(db->db.db_data, dr->dt.dl.dr_data, bonuslen);
	} else if (zfs_refcount_count(&db->db_holds) > db->db_dirtycnt) {
	dnode_t *dn = DB_DNODE(db);
	int size = arc_buf_size(db->db_buf);
	arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
	spa_t *spa = db->db_objset->os_spa;
	enum zio_compress compress_type =
	arc_get_compression(db->db_buf);
	uint8_t complevel = arc_get_complevel(db->db_buf);

	if (arc_is_encrypted(db->db_buf)) {
	boolean_t byteorder;
	uint8_t salt[ZIO_DATA_SALT_LEN];
	uint8_t iv[ZIO_DATA_IV_LEN];
	uint8_t mac[ZIO_DATA_MAC_LEN];

	arc_get_raw_params(db->db_buf, &byteorder, salt,
	iv, mac);
	dr->dt.dl.dr_data = arc_alloc_raw_buf(spa, db,
	dmu_objset_id(dn->dn_objset), byteorder, salt, iv,
	mac, dn->dn_type, size, arc_buf_lsize(db->db_buf),
	compress_type, complevel);
	} else if (compress_type != ZIO_COMPRESS_OFF) {
	ASSERT3U(type, ==, ARC_BUFC_DATA);
	dr->dt.dl.dr_data = arc_alloc_compressed_buf(spa, db,
	size, arc_buf_lsize(db->db_buf), compress_type,
	complevel);
	} else {
	dr->dt.dl.dr_data = arc_alloc_buf(spa, db, type, size);
	}
	bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size);
	} else {
	db->db_buf = NULL;
	dbuf_clear_data(db);
	}
	}

	int
	dbuf_read(dmu_buf_impl_t db, zio_t zio, uint32_t flags)
	{
	int err = 0;
	boolean_t prefetch;
	dnode_t *dn;

	/*
	* We don't have to hold the mutex to check db_state because it
	* can't be freed while we have a hold on the buffer.
	*/
	ASSERT(!zfs_refcount_is_zero(&db->db_holds));

	if (db->db_state == DB_NOFILL)
	return (SET_ERROR(EIO));

	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);

	prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID &&
	(flags & DB_RF_NOPREFETCH) == 0 && dn != NULL &&
	DBUF_IS_CACHEABLE(db);

	mutex_enter(&db->db_mtx);
	if (db->db_state == DB_CACHED) {
	spa_t *spa = dn->dn_objset->os_spa;

	/*
	* Ensure that this block's dnode has been decrypted if
	* the caller has requested decrypted data.
	*/
	err = dbuf_read_verify_dnode_crypt(db, flags);

	/*
	* If the arc buf is compressed or encrypted and the caller
	* requested uncompressed data, we need to untransform it
	* before returning. We also call arc_untransform() on any
	* unauthenticated blocks, which will verify their MAC if
	* the key is now available.
	*/
	if (err == 0 && db->db_buf != NULL &&
	(flags & DB_RF_NO_DECRYPT) == 0 &&
	(arc_is_encrypted(db->db_buf) \|\|
	arc_is_unauthenticated(db->db_buf) \|\|
	arc_get_compression(db->db_buf) != ZIO_COMPRESS_OFF)) {
	zbookmark_phys_t zb;

	SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
	db->db.db_object, db->db_level, db->db_blkid);
	dbuf_fix_old_data(db, spa_syncing_txg(spa));
	err = arc_untransform(db->db_buf, spa, &zb, B_FALSE);
	dbuf_set_data(db, db->db_buf);
	}
	mutex_exit(&db->db_mtx);
	if (err == 0 && prefetch) {
	dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE,
	B_FALSE, flags & DB_RF_HAVESTRUCT);
	}
	DB_DNODE_EXIT(db);
	DBUF_STAT_BUMP(hash_hits);
	} else if (db->db_state == DB_UNCACHED) {
	spa_t *spa = dn->dn_objset->os_spa;
	boolean_t need_wait = B_FALSE;

	db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_READER, FTAG);

	if (zio == NULL &&
	db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) {
	zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL);
	need_wait = B_TRUE;
	}
	err = dbuf_read_impl(db, zio, flags, dblt, FTAG);
	/*
	* dbuf_read_impl has dropped db_mtx and our parent's rwlock
	* for us
	*/
	if (!err && prefetch) {
	dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE,
	db->db_state != DB_CACHED,
	flags & DB_RF_HAVESTRUCT);
	}

	DB_DNODE_EXIT(db);
	DBUF_STAT_BUMP(hash_misses);

	/*
	* If we created a zio_root we must execute it to avoid
	* leaking it, even if it isn't attached to any work due
	* to an error in dbuf_read_impl().
	*/
	if (need_wait) {
	if (err == 0)
	err = zio_wait(zio);
	else
	VERIFY0(zio_wait(zio));
	}
	} else {
	/*
	* Another reader came in while the dbuf was in flight
	* between UNCACHED and CACHED. Either a writer will finish
	* writing the buffer (sending the dbuf to CACHED) or the
	* first reader's request will reach the read_done callback
	* and send the dbuf to CACHED. Otherwise, a failure
	* occurred and the dbuf went to UNCACHED.
	*/
	mutex_exit(&db->db_mtx);
	if (prefetch) {
	dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE,
	B_TRUE, flags & DB_RF_HAVESTRUCT);
	}
	DB_DNODE_EXIT(db);
	DBUF_STAT_BUMP(hash_misses);

	/* Skip the wait per the caller's request. */
	if ((flags & DB_RF_NEVERWAIT) == 0) {
	mutex_enter(&db->db_mtx);
	while (db->db_state == DB_READ \|\|
	db->db_state == DB_FILL) {
	ASSERT(db->db_state == DB_READ \|\|
	(flags & DB_RF_HAVESTRUCT) == 0);
	DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *,
	db, zio_t *, zio);
	cv_wait(&db->db_changed, &db->db_mtx);
	}
	if (db->db_state == DB_UNCACHED)
	err = SET_ERROR(EIO);
	mutex_exit(&db->db_mtx);
	}
	}

	return (err);
	}

	static void
	dbuf_noread(dmu_buf_impl_t *db)
	{
	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
	mutex_enter(&db->db_mtx);
	while (db->db_state == DB_READ \|\| db->db_state == DB_FILL)
	cv_wait(&db->db_changed, &db->db_mtx);
	if (db->db_state == DB_UNCACHED) {
	ASSERT(db->db_buf == NULL);
	ASSERT(db->db.db_data == NULL);
	dbuf_set_data(db, dbuf_alloc_arcbuf(db));
	db->db_state = DB_FILL;
	DTRACE_SET_STATE(db, "assigning filled buffer");
	} else if (db->db_state == DB_NOFILL) {
	dbuf_clear_data(db);
	} else {
	ASSERT3U(db->db_state, ==, DB_CACHED);
	}
	mutex_exit(&db->db_mtx);
	}

	void
	dbuf_unoverride(dbuf_dirty_record_t *dr)
	{
	dmu_buf_impl_t *db = dr->dr_dbuf;
	blkptr_t *bp = &dr->dt.dl.dr_overridden_by;
	uint64_t txg = dr->dr_txg;

	ASSERT(MUTEX_HELD(&db->db_mtx));
	/*
	* This assert is valid because dmu_sync() expects to be called by
	* a zilog's get_data while holding a range lock. This call only
	* comes from dbuf_dirty() callers who must also hold a range lock.
	*/
	ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC);
	ASSERT(db->db_level == 0);

	if (db->db_blkid == DMU_BONUS_BLKID \|\|
	dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN)
	return;

	ASSERT(db->db_data_pending != dr);

	/* free this block */
	if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite)
	zio_free(db->db_objset->os_spa, txg, bp);

	dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
	dr->dt.dl.dr_nopwrite = B_FALSE;
	dr->dt.dl.dr_has_raw_params = B_FALSE;

	/*
	* Release the already-written buffer, so we leave it in
	* a consistent dirty state. Note that all callers are
	* modifying the buffer, so they will immediately do
	* another (redundant) arc_release(). Therefore, leave
	* the buf thawed to save the effort of freezing &
	* immediately re-thawing it.
	*/
	arc_release(dr->dt.dl.dr_data, db);
	}

	/*
	* Evict (if its unreferenced) or clear (if its referenced) any level-0
	* data blocks in the free range, so that any future readers will find
	* empty blocks.
	*/
	void
	dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid,
	dmu_tx_t *tx)
	{
	dmu_buf_impl_t *db_search;
	dmu_buf_impl_t db, db_next;
	uint64_t txg = tx->tx_txg;
	avl_index_t where;
	dbuf_dirty_record_t *dr;

	if (end_blkid > dn->dn_maxblkid &&
	!(start_blkid == DMU_SPILL_BLKID \|\| end_blkid == DMU_SPILL_BLKID))
	end_blkid = dn->dn_maxblkid;
	dprintf_dnode(dn, "start=%llu end=%llu\n", (u_longlong_t)start_blkid,
	(u_longlong_t)end_blkid);

	db_search = kmem_alloc(sizeof (dmu_buf_impl_t), KM_SLEEP);
	db_search->db_level = 0;
	db_search->db_blkid = start_blkid;
	db_search->db_state = DB_SEARCH;

	mutex_enter(&dn->dn_dbufs_mtx);
	db = avl_find(&dn->dn_dbufs, db_search, &where);
	ASSERT3P(db, ==, NULL);

	db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER);

	for (; db != NULL; db = db_next) {
	db_next = AVL_NEXT(&dn->dn_dbufs, db);
	ASSERT(db->db_blkid != DMU_BONUS_BLKID);

	if (db->db_level != 0 \|\| db->db_blkid > end_blkid) {
	break;
	}
	ASSERT3U(db->db_blkid, >=, start_blkid);

	/* found a level 0 buffer in the range */
	mutex_enter(&db->db_mtx);
	if (dbuf_undirty(db, tx)) {
	/* mutex has been dropped and dbuf destroyed */
	continue;
	}

	if (db->db_state == DB_UNCACHED \|\|
	db->db_state == DB_NOFILL \|\|
	db->db_state == DB_EVICTING) {
	ASSERT(db->db.db_data == NULL);
	mutex_exit(&db->db_mtx);
	continue;
	}
	if (db->db_state == DB_READ \|\| db->db_state == DB_FILL) {
	/* will be handled in dbuf_read_done or dbuf_rele */
	db->db_freed_in_flight = TRUE;
	mutex_exit(&db->db_mtx);
	continue;
	}
	if (zfs_refcount_count(&db->db_holds) == 0) {
	ASSERT(db->db_buf);
	dbuf_destroy(db);
	continue;
	}
	/* The dbuf is referenced */

	dr = list_head(&db->db_dirty_records);
	if (dr != NULL) {
	if (dr->dr_txg == txg) {
	/*
	* This buffer is "in-use", re-adjust the file
	* size to reflect that this buffer may
	* contain new data when we sync.
	*/
	if (db->db_blkid != DMU_SPILL_BLKID &&
	db->db_blkid > dn->dn_maxblkid)
	dn->dn_maxblkid = db->db_blkid;
	dbuf_unoverride(dr);
	} else {
	/*
	* This dbuf is not dirty in the open context.
	* Either uncache it (if its not referenced in
	* the open context) or reset its contents to
	* empty.
	*/
	dbuf_fix_old_data(db, txg);
	}
	}
	/* clear the contents if its cached */
	if (db->db_state == DB_CACHED) {
	ASSERT(db->db.db_data != NULL);
	arc_release(db->db_buf, db);
	rw_enter(&db->db_rwlock, RW_WRITER);
	bzero(db->db.db_data, db->db.db_size);
	rw_exit(&db->db_rwlock);
	arc_buf_freeze(db->db_buf);
	}

	mutex_exit(&db->db_mtx);
	}

	kmem_free(db_search, sizeof (dmu_buf_impl_t));
	mutex_exit(&dn->dn_dbufs_mtx);
	}

	void
	dbuf_new_size(dmu_buf_impl_t db, int size, dmu_tx_t tx)
	{
	arc_buf_t buf, old_buf;
	dbuf_dirty_record_t *dr;
	int osize = db->db.db_size;
	arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
	dnode_t *dn;

	ASSERT(db->db_blkid != DMU_BONUS_BLKID);

	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);

	/*
	* XXX we should be doing a dbuf_read, checking the return
	* value and returning that up to our callers
	*/
	dmu_buf_will_dirty(&db->db, tx);

	/* create the data buffer for the new block */
	buf = arc_alloc_buf(dn->dn_objset->os_spa, db, type, size);

	/* copy old block data to the new block */
	old_buf = db->db_buf;
	bcopy(old_buf->b_data, buf->b_data, MIN(osize, size));
	/* zero the remainder */
	if (size > osize)
	bzero((uint8_t *)buf->b_data + osize, size - osize);

	mutex_enter(&db->db_mtx);
	dbuf_set_data(db, buf);
	arc_buf_destroy(old_buf, db);
	db->db.db_size = size;

	dr = list_head(&db->db_dirty_records);
	/* dirty record added by dmu_buf_will_dirty() */
	VERIFY(dr != NULL);
	if (db->db_level == 0)
	dr->dt.dl.dr_data = buf;
	ASSERT3U(dr->dr_txg, ==, tx->tx_txg);
	ASSERT3U(dr->dr_accounted, ==, osize);
	dr->dr_accounted = size;
	mutex_exit(&db->db_mtx);

	dmu_objset_willuse_space(dn->dn_objset, size - osize, tx);
	DB_DNODE_EXIT(db);
	}

	void
	dbuf_release_bp(dmu_buf_impl_t *db)
	{
	objset_t *os __maybe_unused = db->db_objset;

	ASSERT(dsl_pool_sync_context(dmu_objset_pool(os)));
	ASSERT(arc_released(os->os_phys_buf) \|\|
	list_link_active(&os->os_dsl_dataset->ds_synced_link));
	ASSERT(db->db_parent == NULL \|\| arc_released(db->db_parent->db_buf));

	(void) arc_release(db->db_buf, db);
	}

	/*
	* We already have a dirty record for this TXG, and we are being
	* dirtied again.
	*/
	static void
	dbuf_redirty(dbuf_dirty_record_t *dr)
	{
	dmu_buf_impl_t *db = dr->dr_dbuf;

	ASSERT(MUTEX_HELD(&db->db_mtx));

	if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) {
	/*
	* If this buffer has already been written out,
	* we now need to reset its state.
	*/
	dbuf_unoverride(dr);
	if (db->db.db_object != DMU_META_DNODE_OBJECT &&
	db->db_state != DB_NOFILL) {
	/* Already released on initial dirty, so just thaw. */
	ASSERT(arc_released(db->db_buf));
	arc_buf_thaw(db->db_buf);
	}
	}
	}

	dbuf_dirty_record_t *
	dbuf_dirty_lightweight(dnode_t dn, uint64_t blkid, dmu_tx_t tx)
	{
	rw_enter(&dn->dn_struct_rwlock, RW_READER);
	IMPLY(dn->dn_objset->os_raw_receive, dn->dn_maxblkid >= blkid);
	dnode_new_blkid(dn, blkid, tx, B_TRUE, B_FALSE);
	ASSERT(dn->dn_maxblkid >= blkid);

	dbuf_dirty_record_t dr = kmem_zalloc(sizeof (dr), KM_SLEEP);
	list_link_init(&dr->dr_dirty_node);
	list_link_init(&dr->dr_dbuf_node);
	dr->dr_dnode = dn;
	dr->dr_txg = tx->tx_txg;
	dr->dt.dll.dr_blkid = blkid;
	dr->dr_accounted = dn->dn_datablksz;

	/*
	* There should not be any dbuf for the block that we're dirtying.
	* Otherwise the buffer contents could be inconsistent between the
	* dbuf and the lightweight dirty record.
	*/
	ASSERT3P(NULL, ==, dbuf_find(dn->dn_objset, dn->dn_object, 0, blkid));

	mutex_enter(&dn->dn_mtx);
	int txgoff = tx->tx_txg & TXG_MASK;
	if (dn->dn_free_ranges[txgoff] != NULL) {
	range_tree_clear(dn->dn_free_ranges[txgoff], blkid, 1);
	}

	if (dn->dn_nlevels == 1) {
	ASSERT3U(blkid, <, dn->dn_nblkptr);
	list_insert_tail(&dn->dn_dirty_records[txgoff], dr);
	mutex_exit(&dn->dn_mtx);
	rw_exit(&dn->dn_struct_rwlock);
	dnode_setdirty(dn, tx);
	} else {
	mutex_exit(&dn->dn_mtx);

	int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
	dmu_buf_impl_t *parent_db = dbuf_hold_level(dn,
	1, blkid >> epbs, FTAG);
	rw_exit(&dn->dn_struct_rwlock);
	if (parent_db == NULL) {
	kmem_free(dr, sizeof (*dr));
	return (NULL);
	}
	int err = dbuf_read(parent_db, NULL,
	(DB_RF_NOPREFETCH \| DB_RF_CANFAIL));
	if (err != 0) {
	dbuf_rele(parent_db, FTAG);
	kmem_free(dr, sizeof (*dr));
	return (NULL);
	}

	dbuf_dirty_record_t *parent_dr = dbuf_dirty(parent_db, tx);
	dbuf_rele(parent_db, FTAG);
	mutex_enter(&parent_dr->dt.di.dr_mtx);
	ASSERT3U(parent_dr->dr_txg, ==, tx->tx_txg);
	list_insert_tail(&parent_dr->dt.di.dr_children, dr);
	mutex_exit(&parent_dr->dt.di.dr_mtx);
	dr->dr_parent = parent_dr;
	}

	dmu_objset_willuse_space(dn->dn_objset, dr->dr_accounted, tx);

	return (dr);
	}

	dbuf_dirty_record_t *
	dbuf_dirty(dmu_buf_impl_t db, dmu_tx_t tx)
	{
	dnode_t *dn;
	objset_t *os;
	dbuf_dirty_record_t dr, dr_next, *dr_head;
	int txgoff = tx->tx_txg & TXG_MASK;
	boolean_t drop_struct_rwlock = B_FALSE;

	ASSERT(tx->tx_txg != 0);
	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
	DMU_TX_DIRTY_BUF(tx, db);

	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	/*
	* Shouldn't dirty a regular buffer in syncing context. Private
	* objects may be dirtied in syncing context, but only if they
	* were already pre-dirtied in open context.
	*/
	#ifdef ZFS_DEBUG
	if (dn->dn_objset->os_dsl_dataset != NULL) {
	rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock,
	RW_READER, FTAG);
	}
	ASSERT(!dmu_tx_is_syncing(tx) \|\|
	BP_IS_HOLE(dn->dn_objset->os_rootbp) \|\|
	DMU_OBJECT_IS_SPECIAL(dn->dn_object) \|\|
	dn->dn_objset->os_dsl_dataset == NULL);
	if (dn->dn_objset->os_dsl_dataset != NULL)
	rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, FTAG);
	#endif
	/*
	* We make this assert for private objects as well, but after we
	* check if we're already dirty. They are allowed to re-dirty
	* in syncing context.
	*/
	ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT \|\|
	dn->dn_dirtyctx == DN_UNDIRTIED \|\| dn->dn_dirtyctx ==
	(dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN));

	mutex_enter(&db->db_mtx);
	/*
	* XXX make this true for indirects too? The problem is that
	* transactions created with dmu_tx_create_assigned() from
	* syncing context don't bother holding ahead.
	*/
	ASSERT(db->db_level != 0 \|\|
	db->db_state == DB_CACHED \|\| db->db_state == DB_FILL \|\|
	db->db_state == DB_NOFILL);

	mutex_enter(&dn->dn_mtx);
	dnode_set_dirtyctx(dn, tx, db);
	if (tx->tx_txg > dn->dn_dirty_txg)
	dn->dn_dirty_txg = tx->tx_txg;
	mutex_exit(&dn->dn_mtx);

	if (db->db_blkid == DMU_SPILL_BLKID)
	dn->dn_have_spill = B_TRUE;

	/*
	* If this buffer is already dirty, we're done.
	*/
	dr_head = list_head(&db->db_dirty_records);
	ASSERT(dr_head == NULL \|\| dr_head->dr_txg <= tx->tx_txg \|\|
	db->db.db_object == DMU_META_DNODE_OBJECT);
	dr_next = dbuf_find_dirty_lte(db, tx->tx_txg);
	if (dr_next && dr_next->dr_txg == tx->tx_txg) {
	DB_DNODE_EXIT(db);

	dbuf_redirty(dr_next);
	mutex_exit(&db->db_mtx);
	return (dr_next);
	}

	/*
	* Only valid if not already dirty.
	*/
	ASSERT(dn->dn_object == 0 \|\|
	dn->dn_dirtyctx == DN_UNDIRTIED \|\| dn->dn_dirtyctx ==
	(dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN));

	ASSERT3U(dn->dn_nlevels, >, db->db_level);

	/*
	* We should only be dirtying in syncing context if it's the
	* mos or we're initializing the os or it's a special object.
	* However, we are allowed to dirty in syncing context provided
	* we already dirtied it in open context. Hence we must make
	* this assertion only if we're not already dirty.
	*/
	os = dn->dn_objset;
	VERIFY3U(tx->tx_txg, <=, spa_final_dirty_txg(os->os_spa));
	#ifdef ZFS_DEBUG
	if (dn->dn_objset->os_dsl_dataset != NULL)
	rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_READER, FTAG);
	ASSERT(!dmu_tx_is_syncing(tx) \|\| DMU_OBJECT_IS_SPECIAL(dn->dn_object) \|\|
	os->os_dsl_dataset == NULL \|\| BP_IS_HOLE(os->os_rootbp));
	if (dn->dn_objset->os_dsl_dataset != NULL)
	rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG);
	#endif
	ASSERT(db->db.db_size != 0);

	dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size);

	if (db->db_blkid != DMU_BONUS_BLKID) {
	dmu_objset_willuse_space(os, db->db.db_size, tx);
	}

	/*
	* If this buffer is dirty in an old transaction group we need
	* to make a copy of it so that the changes we make in this
	* transaction group won't leak out when we sync the older txg.
	*/
	dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP);
	list_link_init(&dr->dr_dirty_node);
	list_link_init(&dr->dr_dbuf_node);
	dr->dr_dnode = dn;
	if (db->db_level == 0) {
	void *data_old = db->db_buf;

	if (db->db_state != DB_NOFILL) {
	if (db->db_blkid == DMU_BONUS_BLKID) {
	dbuf_fix_old_data(db, tx->tx_txg);
	data_old = db->db.db_data;
	} else if (db->db.db_object != DMU_META_DNODE_OBJECT) {
	/*
	* Release the data buffer from the cache so
	* that we can modify it without impacting
	* possible other users of this cached data
	* block. Note that indirect blocks and
	* private objects are not released until the
	* syncing state (since they are only modified
	* then).
	*/
	arc_release(db->db_buf, db);
	dbuf_fix_old_data(db, tx->tx_txg);
	data_old = db->db_buf;
	}
	ASSERT(data_old != NULL);
	}
	dr->dt.dl.dr_data = data_old;
	} else {
	mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_NOLOCKDEP, NULL);
	list_create(&dr->dt.di.dr_children,
	sizeof (dbuf_dirty_record_t),
	offsetof(dbuf_dirty_record_t, dr_dirty_node));
	}
	if (db->db_blkid != DMU_BONUS_BLKID)
	dr->dr_accounted = db->db.db_size;
	dr->dr_dbuf = db;
	dr->dr_txg = tx->tx_txg;
	list_insert_before(&db->db_dirty_records, dr_next, dr);

	/*
	* We could have been freed_in_flight between the dbuf_noread
	* and dbuf_dirty. We win, as though the dbuf_noread() had
	* happened after the free.
	*/
	if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID &&
	db->db_blkid != DMU_SPILL_BLKID) {
	mutex_enter(&dn->dn_mtx);
	if (dn->dn_free_ranges[txgoff] != NULL) {
	range_tree_clear(dn->dn_free_ranges[txgoff],
	db->db_blkid, 1);
	}
	mutex_exit(&dn->dn_mtx);
	db->db_freed_in_flight = FALSE;
	}

	/*
	* This buffer is now part of this txg
	*/
	dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg);
	db->db_dirtycnt += 1;
	ASSERT3U(db->db_dirtycnt, <=, 3);

	mutex_exit(&db->db_mtx);

	if (db->db_blkid == DMU_BONUS_BLKID \|\|
	db->db_blkid == DMU_SPILL_BLKID) {
	mutex_enter(&dn->dn_mtx);
	ASSERT(!list_link_active(&dr->dr_dirty_node));
	list_insert_tail(&dn->dn_dirty_records[txgoff], dr);
	mutex_exit(&dn->dn_mtx);
	dnode_setdirty(dn, tx);
	DB_DNODE_EXIT(db);
	return (dr);
	}

	if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) {
	rw_enter(&dn->dn_struct_rwlock, RW_READER);
	drop_struct_rwlock = B_TRUE;
	}

	/*
	* If we are overwriting a dedup BP, then unless it is snapshotted,
	* when we get to syncing context we will need to decrement its
	* refcount in the DDT. Prefetch the relevant DDT block so that
	* syncing context won't have to wait for the i/o.
	*/
	if (db->db_blkptr != NULL) {
	db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_READER, FTAG);
	ddt_prefetch(os->os_spa, db->db_blkptr);
	dmu_buf_unlock_parent(db, dblt, FTAG);
	}

	/*
	* We need to hold the dn_struct_rwlock to make this assertion,
	* because it protects dn_phys / dn_next_nlevels from changing.
	*/
	ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) \|\|
	dn->dn_phys->dn_nlevels > db->db_level \|\|
	dn->dn_next_nlevels[txgoff] > db->db_level \|\|
	dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level \|\|
	dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level);


	if (db->db_level == 0) {
	ASSERT(!db->db_objset->os_raw_receive \|\|
	dn->dn_maxblkid >= db->db_blkid);
	dnode_new_blkid(dn, db->db_blkid, tx,
	drop_struct_rwlock, B_FALSE);
	ASSERT(dn->dn_maxblkid >= db->db_blkid);
	}

	if (db->db_level+1 < dn->dn_nlevels) {
	dmu_buf_impl_t *parent = db->db_parent;
	dbuf_dirty_record_t *di;
	int parent_held = FALSE;

	if (db->db_parent == NULL \|\| db->db_parent == dn->dn_dbuf) {
	int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
	parent = dbuf_hold_level(dn, db->db_level + 1,
	db->db_blkid >> epbs, FTAG);
	ASSERT(parent != NULL);
	parent_held = TRUE;
	}
	if (drop_struct_rwlock)
	rw_exit(&dn->dn_struct_rwlock);
	ASSERT3U(db->db_level + 1, ==, parent->db_level);
	di = dbuf_dirty(parent, tx);
	if (parent_held)
	dbuf_rele(parent, FTAG);

	mutex_enter(&db->db_mtx);
	/*
	* Since we've dropped the mutex, it's possible that
	* dbuf_undirty() might have changed this out from under us.
	*/
	if (list_head(&db->db_dirty_records) == dr \|\|
	dn->dn_object == DMU_META_DNODE_OBJECT) {
	mutex_enter(&di->dt.di.dr_mtx);
	ASSERT3U(di->dr_txg, ==, tx->tx_txg);
	ASSERT(!list_link_active(&dr->dr_dirty_node));
	list_insert_tail(&di->dt.di.dr_children, dr);
	mutex_exit(&di->dt.di.dr_mtx);
	dr->dr_parent = di;
	}
	mutex_exit(&db->db_mtx);
	} else {
	ASSERT(db->db_level + 1 == dn->dn_nlevels);
	ASSERT(db->db_blkid < dn->dn_nblkptr);
	ASSERT(db->db_parent == NULL \|\| db->db_parent == dn->dn_dbuf);
	mutex_enter(&dn->dn_mtx);
	ASSERT(!list_link_active(&dr->dr_dirty_node));
	list_insert_tail(&dn->dn_dirty_records[txgoff], dr);
	mutex_exit(&dn->dn_mtx);
	if (drop_struct_rwlock)
	rw_exit(&dn->dn_struct_rwlock);
	}

	dnode_setdirty(dn, tx);
	DB_DNODE_EXIT(db);
	return (dr);
	}

	static void
	dbuf_undirty_bonus(dbuf_dirty_record_t *dr)
	{
	dmu_buf_impl_t *db = dr->dr_dbuf;

	if (dr->dt.dl.dr_data != db->db.db_data) {
	struct dnode *dn = dr->dr_dnode;
	int max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);

	kmem_free(dr->dt.dl.dr_data, max_bonuslen);
	arc_space_return(max_bonuslen, ARC_SPACE_BONUS);
	}
	db->db_data_pending = NULL;
	ASSERT(list_next(&db->db_dirty_records, dr) == NULL);
	list_remove(&db->db_dirty_records, dr);
	if (dr->dr_dbuf->db_level != 0) {
	mutex_destroy(&dr->dt.di.dr_mtx);
	list_destroy(&dr->dt.di.dr_children);
	}
	kmem_free(dr, sizeof (dbuf_dirty_record_t));
	ASSERT3U(db->db_dirtycnt, >, 0);
	db->db_dirtycnt -= 1;
	}

	/*
	* Undirty a buffer in the transaction group referenced by the given
	* transaction. Return whether this evicted the dbuf.
	*/
	static boolean_t
	dbuf_undirty(dmu_buf_impl_t db, dmu_tx_t tx)
	{
	uint64_t txg = tx->tx_txg;

	ASSERT(txg != 0);

	/*
	* Due to our use of dn_nlevels below, this can only be called
	* in open context, unless we are operating on the MOS.
	* From syncing context, dn_nlevels may be different from the
	* dn_nlevels used when dbuf was dirtied.
	*/
	ASSERT(db->db_objset ==
	dmu_objset_pool(db->db_objset)->dp_meta_objset \|\|
	txg != spa_syncing_txg(dmu_objset_spa(db->db_objset)));
	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
	ASSERT0(db->db_level);
	ASSERT(MUTEX_HELD(&db->db_mtx));

	/*
	* If this buffer is not dirty, we're done.
	*/
	dbuf_dirty_record_t *dr = dbuf_find_dirty_eq(db, txg);
	if (dr == NULL)
	return (B_FALSE);
	ASSERT(dr->dr_dbuf == db);

	dnode_t *dn = dr->dr_dnode;

	dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size);

	ASSERT(db->db.db_size != 0);

	dsl_pool_undirty_space(dmu_objset_pool(dn->dn_objset),
	dr->dr_accounted, txg);

	list_remove(&db->db_dirty_records, dr);

	/*
	* Note that there are three places in dbuf_dirty()
	* where this dirty record may be put on a list.
	* Make sure to do a list_remove corresponding to
	* every one of those list_insert calls.
	*/
	if (dr->dr_parent) {
	mutex_enter(&dr->dr_parent->dt.di.dr_mtx);
	list_remove(&dr->dr_parent->dt.di.dr_children, dr);
	mutex_exit(&dr->dr_parent->dt.di.dr_mtx);
	} else if (db->db_blkid == DMU_SPILL_BLKID \|\|
	db->db_level + 1 == dn->dn_nlevels) {
	ASSERT(db->db_blkptr == NULL \|\| db->db_parent == dn->dn_dbuf);
	mutex_enter(&dn->dn_mtx);
	list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr);
	mutex_exit(&dn->dn_mtx);
	}

	if (db->db_state != DB_NOFILL) {
	dbuf_unoverride(dr);

	ASSERT(db->db_buf != NULL);
	ASSERT(dr->dt.dl.dr_data != NULL);
	if (dr->dt.dl.dr_data != db->db_buf)
	arc_buf_destroy(dr->dt.dl.dr_data, db);
	}

	kmem_free(dr, sizeof (dbuf_dirty_record_t));

	ASSERT(db->db_dirtycnt > 0);
	db->db_dirtycnt -= 1;

	if (zfs_refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) {
	ASSERT(db->db_state == DB_NOFILL \|\| arc_released(db->db_buf));
	dbuf_destroy(db);
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	static void
	dmu_buf_will_dirty_impl(dmu_buf_t db_fake, int flags, dmu_tx_t tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;

	ASSERT(tx->tx_txg != 0);
	ASSERT(!zfs_refcount_is_zero(&db->db_holds));

	/*
	* Quick check for dirtiness. For already dirty blocks, this
	* reduces runtime of this function by >90%, and overall performance
	* by 50% for some workloads (e.g. file deletion with indirect blocks
	* cached).
	*/
	mutex_enter(&db->db_mtx);

	if (db->db_state == DB_CACHED) {
	dbuf_dirty_record_t *dr = dbuf_find_dirty_eq(db, tx->tx_txg);
	/*
	* It's possible that it is already dirty but not cached,
	* because there are some calls to dbuf_dirty() that don't
	* go through dmu_buf_will_dirty().
	*/
	if (dr != NULL) {
	/* This dbuf is already dirty and cached. */
	dbuf_redirty(dr);
	mutex_exit(&db->db_mtx);
	return;
	}
	}
	mutex_exit(&db->db_mtx);

	DB_DNODE_ENTER(db);
	if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock))
	flags \|= DB_RF_HAVESTRUCT;
	DB_DNODE_EXIT(db);
	(void) dbuf_read(db, NULL, flags);
	(void) dbuf_dirty(db, tx);
	}

	void
	dmu_buf_will_dirty(dmu_buf_t db_fake, dmu_tx_t tx)
	{
	dmu_buf_will_dirty_impl(db_fake,
	DB_RF_MUST_SUCCEED \| DB_RF_NOPREFETCH, tx);
	}

	boolean_t
	dmu_buf_is_dirty(dmu_buf_t db_fake, dmu_tx_t tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;
	dbuf_dirty_record_t *dr;

	mutex_enter(&db->db_mtx);
	dr = dbuf_find_dirty_eq(db, tx->tx_txg);
	mutex_exit(&db->db_mtx);
	return (dr != NULL);
	}

	void
	dmu_buf_will_not_fill(dmu_buf_t db_fake, dmu_tx_t tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;

	db->db_state = DB_NOFILL;
	DTRACE_SET_STATE(db, "allocating NOFILL buffer");
	dmu_buf_will_fill(db_fake, tx);
	}

	void
	dmu_buf_will_fill(dmu_buf_t db_fake, dmu_tx_t tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;

	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
	ASSERT(tx->tx_txg != 0);
	ASSERT(db->db_level == 0);
	ASSERT(!zfs_refcount_is_zero(&db->db_holds));

	ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT \|\|
	dmu_tx_private_ok(tx));

	dbuf_noread(db);
	(void) dbuf_dirty(db, tx);
	}

	/*
	* This function is effectively the same as dmu_buf_will_dirty(), but
	* indicates the caller expects raw encrypted data in the db, and provides
	* the crypt params (byteorder, salt, iv, mac) which should be stored in the
	* blkptr_t when this dbuf is written. This is only used for blocks of
	* dnodes, during raw receive.
	*/
	void
	dmu_buf_set_crypt_params(dmu_buf_t *db_fake, boolean_t byteorder,
	const uint8_t salt, const uint8_t iv, const uint8_t mac, dmu_tx_t tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;
	dbuf_dirty_record_t *dr;

	/*
	* dr_has_raw_params is only processed for blocks of dnodes
	* (see dbuf_sync_dnode_leaf_crypt()).
	*/
	ASSERT3U(db->db.db_object, ==, DMU_META_DNODE_OBJECT);
	ASSERT3U(db->db_level, ==, 0);
	ASSERT(db->db_objset->os_raw_receive);

	dmu_buf_will_dirty_impl(db_fake,
	DB_RF_MUST_SUCCEED \| DB_RF_NOPREFETCH \| DB_RF_NO_DECRYPT, tx);

	dr = dbuf_find_dirty_eq(db, tx->tx_txg);

	ASSERT3P(dr, !=, NULL);

	dr->dt.dl.dr_has_raw_params = B_TRUE;
	dr->dt.dl.dr_byteorder = byteorder;
	bcopy(salt, dr->dt.dl.dr_salt, ZIO_DATA_SALT_LEN);
	bcopy(iv, dr->dt.dl.dr_iv, ZIO_DATA_IV_LEN);
	bcopy(mac, dr->dt.dl.dr_mac, ZIO_DATA_MAC_LEN);
	}

	static void
	dbuf_override_impl(dmu_buf_impl_t db, const blkptr_t bp, dmu_tx_t *tx)
	{
	struct dirty_leaf *dl;
	dbuf_dirty_record_t *dr;

	dr = list_head(&db->db_dirty_records);
	ASSERT3U(dr->dr_txg, ==, tx->tx_txg);
	dl = &dr->dt.dl;
	dl->dr_overridden_by = *bp;
	dl->dr_override_state = DR_OVERRIDDEN;
	dl->dr_overridden_by.blk_birth = dr->dr_txg;
	}

	/* ARGSUSED */
	void
	dmu_buf_fill_done(dmu_buf_t dbuf, dmu_tx_t tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )dbuf;
	dbuf_states_t old_state;
	mutex_enter(&db->db_mtx);
	DBUF_VERIFY(db);

	old_state = db->db_state;
	db->db_state = DB_CACHED;
	if (old_state == DB_FILL) {
	if (db->db_level == 0 && db->db_freed_in_flight) {
	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
	/* we were freed while filling */
	/* XXX dbuf_undirty? */
	bzero(db->db.db_data, db->db.db_size);
	db->db_freed_in_flight = FALSE;
	DTRACE_SET_STATE(db,
	"fill done handling freed in flight");
	} else {
	DTRACE_SET_STATE(db, "fill done");
	}
	cv_broadcast(&db->db_changed);
	}
	mutex_exit(&db->db_mtx);
	}

	void
	dmu_buf_write_embedded(dmu_buf_t dbuf, void data,
	bp_embedded_type_t etype, enum zio_compress comp,
	int uncompressed_size, int compressed_size, int byteorder,
	dmu_tx_t *tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )dbuf;
	struct dirty_leaf *dl;
	dmu_object_type_t type;
	dbuf_dirty_record_t *dr;

	if (etype == BP_EMBEDDED_TYPE_DATA) {
	ASSERT(spa_feature_is_active(dmu_objset_spa(db->db_objset),
	SPA_FEATURE_EMBEDDED_DATA));
	}

	DB_DNODE_ENTER(db);
	type = DB_DNODE(db)->dn_type;
	DB_DNODE_EXIT(db);

	ASSERT0(db->db_level);
	ASSERT(db->db_blkid != DMU_BONUS_BLKID);

	dmu_buf_will_not_fill(dbuf, tx);

	dr = list_head(&db->db_dirty_records);
	ASSERT3U(dr->dr_txg, ==, tx->tx_txg);
	dl = &dr->dt.dl;
	encode_embedded_bp_compressed(&dl->dr_overridden_by,
	data, comp, uncompressed_size, compressed_size);
	BPE_SET_ETYPE(&dl->dr_overridden_by, etype);
	BP_SET_TYPE(&dl->dr_overridden_by, type);
	BP_SET_LEVEL(&dl->dr_overridden_by, 0);
	BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder);

	dl->dr_override_state = DR_OVERRIDDEN;
	dl->dr_overridden_by.blk_birth = dr->dr_txg;
	}

	void
	dmu_buf_redact(dmu_buf_t dbuf, dmu_tx_t tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )dbuf;
	dmu_object_type_t type;
	ASSERT(dsl_dataset_feature_is_active(db->db_objset->os_dsl_dataset,
	SPA_FEATURE_REDACTED_DATASETS));

	DB_DNODE_ENTER(db);
	type = DB_DNODE(db)->dn_type;
	DB_DNODE_EXIT(db);

	ASSERT0(db->db_level);
	dmu_buf_will_not_fill(dbuf, tx);

	blkptr_t bp = { { { {0} } } };
	BP_SET_TYPE(&bp, type);
	BP_SET_LEVEL(&bp, 0);
	BP_SET_BIRTH(&bp, tx->tx_txg, 0);
	BP_SET_REDACTED(&bp);
	BPE_SET_LSIZE(&bp, dbuf->db_size);

	dbuf_override_impl(db, &bp, tx);
	}

	/*
	* Directly assign a provided arc buf to a given dbuf if it's not referenced
	* by anybody except our caller. Otherwise copy arcbuf's contents to dbuf.
	*/
	void
	dbuf_assign_arcbuf(dmu_buf_impl_t db, arc_buf_t buf, dmu_tx_t *tx)
	{
	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
	ASSERT(db->db_level == 0);
	ASSERT3U(dbuf_is_metadata(db), ==, arc_is_metadata(buf));
	ASSERT(buf != NULL);
	ASSERT3U(arc_buf_lsize(buf), ==, db->db.db_size);
	ASSERT(tx->tx_txg != 0);

	arc_return_buf(buf, db);
	ASSERT(arc_released(buf));

	mutex_enter(&db->db_mtx);

	while (db->db_state == DB_READ \|\| db->db_state == DB_FILL)
	cv_wait(&db->db_changed, &db->db_mtx);

	ASSERT(db->db_state == DB_CACHED \|\| db->db_state == DB_UNCACHED);

	if (db->db_state == DB_CACHED &&
	zfs_refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) {
	/*
	* In practice, we will never have a case where we have an
	* encrypted arc buffer while additional holds exist on the
	* dbuf. We don't handle this here so we simply assert that
	* fact instead.
	*/
	ASSERT(!arc_is_encrypted(buf));
	mutex_exit(&db->db_mtx);
	(void) dbuf_dirty(db, tx);
	bcopy(buf->b_data, db->db.db_data, db->db.db_size);
	arc_buf_destroy(buf, db);
	return;
	}

	if (db->db_state == DB_CACHED) {
	dbuf_dirty_record_t *dr = list_head(&db->db_dirty_records);

	ASSERT(db->db_buf != NULL);
	if (dr != NULL && dr->dr_txg == tx->tx_txg) {
	ASSERT(dr->dt.dl.dr_data == db->db_buf);

	if (!arc_released(db->db_buf)) {
	ASSERT(dr->dt.dl.dr_override_state ==
	DR_OVERRIDDEN);
	arc_release(db->db_buf, db);
	}
	dr->dt.dl.dr_data = buf;
	arc_buf_destroy(db->db_buf, db);
	} else if (dr == NULL \|\| dr->dt.dl.dr_data != db->db_buf) {
	arc_release(db->db_buf, db);
	arc_buf_destroy(db->db_buf, db);
	}
	db->db_buf = NULL;
	}
	ASSERT(db->db_buf == NULL);
	dbuf_set_data(db, buf);
	db->db_state = DB_FILL;
	DTRACE_SET_STATE(db, "filling assigned arcbuf");
	mutex_exit(&db->db_mtx);
	(void) dbuf_dirty(db, tx);
	dmu_buf_fill_done(&db->db, tx);
	}

	void
	dbuf_destroy(dmu_buf_impl_t *db)
	{
	dnode_t *dn;
	dmu_buf_impl_t *parent = db->db_parent;
	dmu_buf_impl_t *dndb;

	ASSERT(MUTEX_HELD(&db->db_mtx));
	ASSERT(zfs_refcount_is_zero(&db->db_holds));

	if (db->db_buf != NULL) {
	arc_buf_destroy(db->db_buf, db);
	db->db_buf = NULL;
	}

	if (db->db_blkid == DMU_BONUS_BLKID) {
	int slots = DB_DNODE(db)->dn_num_slots;
	int bonuslen = DN_SLOTS_TO_BONUSLEN(slots);
	if (db->db.db_data != NULL) {
	kmem_free(db->db.db_data, bonuslen);
	arc_space_return(bonuslen, ARC_SPACE_BONUS);
	db->db_state = DB_UNCACHED;
	DTRACE_SET_STATE(db, "buffer cleared");
	}
	}

	dbuf_clear_data(db);

	if (multilist_link_active(&db->db_cache_link)) {
	ASSERT(db->db_caching_status == DB_DBUF_CACHE \|\|
	db->db_caching_status == DB_DBUF_METADATA_CACHE);

	multilist_remove(&dbuf_caches[db->db_caching_status].cache, db);
	(void) zfs_refcount_remove_many(
	&dbuf_caches[db->db_caching_status].size,
	db->db.db_size, db);

	if (db->db_caching_status == DB_DBUF_METADATA_CACHE) {
	DBUF_STAT_BUMPDOWN(metadata_cache_count);
	} else {
	DBUF_STAT_BUMPDOWN(cache_levels[db->db_level]);
	DBUF_STAT_BUMPDOWN(cache_count);
	DBUF_STAT_DECR(cache_levels_bytes[db->db_level],
	db->db.db_size);
	}
	db->db_caching_status = DB_NO_CACHE;
	}

	ASSERT(db->db_state == DB_UNCACHED \|\| db->db_state == DB_NOFILL);
	ASSERT(db->db_data_pending == NULL);
	ASSERT(list_is_empty(&db->db_dirty_records));

	db->db_state = DB_EVICTING;
	DTRACE_SET_STATE(db, "buffer eviction started");
	db->db_blkptr = NULL;

	/*
	* Now that db_state is DB_EVICTING, nobody else can find this via
	* the hash table. We can now drop db_mtx, which allows us to
	* acquire the dn_dbufs_mtx.
	*/
	mutex_exit(&db->db_mtx);

	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	dndb = dn->dn_dbuf;
	if (db->db_blkid != DMU_BONUS_BLKID) {
	boolean_t needlock = !MUTEX_HELD(&dn->dn_dbufs_mtx);
	if (needlock)
	mutex_enter_nested(&dn->dn_dbufs_mtx,
	NESTED_SINGLE);
	avl_remove(&dn->dn_dbufs, db);
	membar_producer();
	DB_DNODE_EXIT(db);
	if (needlock)
	mutex_exit(&dn->dn_dbufs_mtx);
	/*
	* Decrementing the dbuf count means that the hold corresponding
	* to the removed dbuf is no longer discounted in dnode_move(),
	* so the dnode cannot be moved until after we release the hold.
	* The membar_producer() ensures visibility of the decremented
	* value in dnode_move(), since DB_DNODE_EXIT doesn't actually
	* release any lock.
	*/
	mutex_enter(&dn->dn_mtx);
	dnode_rele_and_unlock(dn, db, B_TRUE);
	db->db_dnode_handle = NULL;

	dbuf_hash_remove(db);
	} else {
	DB_DNODE_EXIT(db);
	}

	ASSERT(zfs_refcount_is_zero(&db->db_holds));

	db->db_parent = NULL;

	ASSERT(db->db_buf == NULL);
	ASSERT(db->db.db_data == NULL);
	ASSERT(db->db_hash_next == NULL);
	ASSERT(db->db_blkptr == NULL);
	ASSERT(db->db_data_pending == NULL);
	ASSERT3U(db->db_caching_status, ==, DB_NO_CACHE);
	ASSERT(!multilist_link_active(&db->db_cache_link));

	kmem_cache_free(dbuf_kmem_cache, db);
	arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF);

	/*
	* If this dbuf is referenced from an indirect dbuf,
	* decrement the ref count on the indirect dbuf.
	*/
	if (parent && parent != dndb) {
	mutex_enter(&parent->db_mtx);
	dbuf_rele_and_unlock(parent, db, B_TRUE);
	}
	}

	/*
	* Note: While bpp will always be updated if the function returns success,
	* parentp will not be updated if the dnode does not have dn_dbuf filled in;
	* this happens when the dnode is the meta-dnode, or {user\|group\|project}used
	* object.
	*/
	__attribute__((always_inline))
	static inline int
	dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse,
	dmu_buf_impl_t parentp, blkptr_t bpp)
	{
	*parentp = NULL;
	*bpp = NULL;

	ASSERT(blkid != DMU_BONUS_BLKID);

	if (blkid == DMU_SPILL_BLKID) {
	mutex_enter(&dn->dn_mtx);
	if (dn->dn_have_spill &&
	(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR))
	*bpp = DN_SPILL_BLKPTR(dn->dn_phys);
	else
	*bpp = NULL;
	dbuf_add_ref(dn->dn_dbuf, NULL);
	*parentp = dn->dn_dbuf;
	mutex_exit(&dn->dn_mtx);
	return (0);
	}

	int nlevels =
	(dn->dn_phys->dn_nlevels == 0) ? 1 : dn->dn_phys->dn_nlevels;
	int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;

	ASSERT3U(level * epbs, <, 64);
	ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
	/*
	* This assertion shouldn't trip as long as the max indirect block size
	* is less than 1M. The reason for this is that up to that point,
	* the number of levels required to address an entire object with blocks
	* of size SPA_MINBLOCKSIZE satisfies nlevels * epbs + 1 <= 64. In
	* other words, if N * epbs + 1 > 64, then if (N-1) * epbs + 1 > 55
	* (i.e. we can address the entire object), objects will all use at most
	* N-1 levels and the assertion won't overflow. However, once epbs is
	* 13, 4 * 13 + 1 = 53, but 5 * 13 + 1 = 66. Then, 4 levels will not be
	* enough to address an entire object, so objects will have 5 levels,
	* but then this assertion will overflow.
	*
	* All this is to say that if we ever increase DN_MAX_INDBLKSHIFT, we
	* need to redo this logic to handle overflows.
	*/
	ASSERT(level >= nlevels \|\|
	((nlevels - level - 1) * epbs) +
	highbit64(dn->dn_phys->dn_nblkptr) <= 64);
	if (level >= nlevels \|\|
	blkid >= ((uint64_t)dn->dn_phys->dn_nblkptr <<
	((nlevels - level - 1) * epbs)) \|\|
	(fail_sparse &&
	blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) {
	/* the buffer has no parent yet */
	return (SET_ERROR(ENOENT));
	} else if (level < nlevels-1) {
	/* this block is referenced from an indirect block */
	int err;

	err = dbuf_hold_impl(dn, level + 1,
	blkid >> epbs, fail_sparse, FALSE, NULL, parentp);

	if (err)
	return (err);
	err = dbuf_read(*parentp, NULL,
	(DB_RF_HAVESTRUCT \| DB_RF_NOPREFETCH \| DB_RF_CANFAIL));
	if (err) {
	dbuf_rele(*parentp, NULL);
	*parentp = NULL;
	return (err);
	}
	rw_enter(&(*parentp)->db_rwlock, RW_READER);
	bpp = ((blkptr_t )(*parentp)->db.db_data) +
	(blkid & ((1ULL << epbs) - 1));
	if (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))
	ASSERT(BP_IS_HOLE(*bpp));
	rw_exit(&(*parentp)->db_rwlock);
	return (0);
	} else {
	/* the block is referenced from the dnode */
	ASSERT3U(level, ==, nlevels-1);
	ASSERT(dn->dn_phys->dn_nblkptr == 0 \|\|
	blkid < dn->dn_phys->dn_nblkptr);
	if (dn->dn_dbuf) {
	dbuf_add_ref(dn->dn_dbuf, NULL);
	*parentp = dn->dn_dbuf;
	}
	*bpp = &dn->dn_phys->dn_blkptr[blkid];
	return (0);
	}
	}

	static dmu_buf_impl_t *
	dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid,
	dmu_buf_impl_t parent, blkptr_t blkptr)
	{
	objset_t *os = dn->dn_objset;
	dmu_buf_impl_t db, odb;

	ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
	ASSERT(dn->dn_type != DMU_OT_NONE);

	db = kmem_cache_alloc(dbuf_kmem_cache, KM_SLEEP);

	list_create(&db->db_dirty_records, sizeof (dbuf_dirty_record_t),
	offsetof(dbuf_dirty_record_t, dr_dbuf_node));

	db->db_objset = os;
	db->db.db_object = dn->dn_object;
	db->db_level = level;
	db->db_blkid = blkid;
	db->db_dirtycnt = 0;
	db->db_dnode_handle = dn->dn_handle;
	db->db_parent = parent;
	db->db_blkptr = blkptr;

	db->db_user = NULL;
	db->db_user_immediate_evict = FALSE;
	db->db_freed_in_flight = FALSE;
	db->db_pending_evict = FALSE;

	if (blkid == DMU_BONUS_BLKID) {
	ASSERT3P(parent, ==, dn->dn_dbuf);
	db->db.db_size = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots) -
	(dn->dn_nblkptr-1) * sizeof (blkptr_t);
	ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen);
	db->db.db_offset = DMU_BONUS_BLKID;
	db->db_state = DB_UNCACHED;
	DTRACE_SET_STATE(db, "bonus buffer created");
	db->db_caching_status = DB_NO_CACHE;
	/* the bonus dbuf is not placed in the hash table */
	arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF);
	return (db);
	} else if (blkid == DMU_SPILL_BLKID) {
	db->db.db_size = (blkptr != NULL) ?
	BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE;
	db->db.db_offset = 0;
	} else {
	int blocksize =
	db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz;
	db->db.db_size = blocksize;
	db->db.db_offset = db->db_blkid * blocksize;
	}

	/*
	* Hold the dn_dbufs_mtx while we get the new dbuf
	* in the hash table and added to the dbufs list.
	* This prevents a possible deadlock with someone
	* trying to look up this dbuf before it's added to the
	* dn_dbufs list.
	*/
	mutex_enter(&dn->dn_dbufs_mtx);
	db->db_state = DB_EVICTING; /* not worth logging this state change */
	if ((odb = dbuf_hash_insert(db)) != NULL) {
	/* someone else inserted it first */
	- kmem_cache_free(dbuf_kmem_cache, db);
	mutex_exit(&dn->dn_dbufs_mtx);
	+ kmem_cache_free(dbuf_kmem_cache, db);
	DBUF_STAT_BUMP(hash_insert_race);
	return (odb);
	}
	avl_add(&dn->dn_dbufs, db);

	db->db_state = DB_UNCACHED;
	DTRACE_SET_STATE(db, "regular buffer created");
	db->db_caching_status = DB_NO_CACHE;
	mutex_exit(&dn->dn_dbufs_mtx);
	arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF);

	if (parent && parent != dn->dn_dbuf)
	dbuf_add_ref(parent, db);

	ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT \|\|
	zfs_refcount_count(&dn->dn_holds) > 0);
	(void) zfs_refcount_add(&dn->dn_holds, db);

	dprintf_dbuf(db, "db=%p\n", db);

	return (db);
	}

	/*
	* This function returns a block pointer and information about the object,
	* given a dnode and a block. This is a publicly accessible version of
	* dbuf_findbp that only returns some information, rather than the
	* dbuf. Note that the dnode passed in must be held, and the dn_struct_rwlock
	* should be locked as (at least) a reader.
	*/
	int
	dbuf_dnode_findbp(dnode_t *dn, uint64_t level, uint64_t blkid,
	blkptr_t bp, uint16_t datablkszsec, uint8_t *indblkshift)
	{
	dmu_buf_impl_t *dbp = NULL;
	blkptr_t *bp2;
	int err = 0;
	ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));

	err = dbuf_findbp(dn, level, blkid, B_FALSE, &dbp, &bp2);
	if (err == 0) {
	bp = bp2;
	if (dbp != NULL)
	dbuf_rele(dbp, NULL);
	if (datablkszsec != NULL)
	*datablkszsec = dn->dn_phys->dn_datablkszsec;
	if (indblkshift != NULL)
	*indblkshift = dn->dn_phys->dn_indblkshift;
	}

	return (err);
	}

	typedef struct dbuf_prefetch_arg {
	spa_t dpa_spa; / The spa to issue the prefetch in. */
	zbookmark_phys_t dpa_zb; /* The target block to prefetch. */
	int dpa_epbs; /* Entries (blkptr_t's) Per Block Shift. */
	int dpa_curlevel; /* The current level that we're reading */
	dnode_t dpa_dnode; / The dnode associated with the prefetch */
	zio_priority_t dpa_prio; /* The priority I/Os should be issued at. */
	zio_t dpa_zio; / The parent zio_t for all prefetches. */
	arc_flags_t dpa_aflags; /* Flags to pass to the final prefetch. */
	dbuf_prefetch_fn dpa_cb; /* prefetch completion callback */
	void dpa_arg; / prefetch completion arg */
	} dbuf_prefetch_arg_t;

	static void
	dbuf_prefetch_fini(dbuf_prefetch_arg_t *dpa, boolean_t io_done)
	{
	if (dpa->dpa_cb != NULL)
	dpa->dpa_cb(dpa->dpa_arg, io_done);
	kmem_free(dpa, sizeof (*dpa));
	}

	static void
	dbuf_issue_final_prefetch_done(zio_t zio, const zbookmark_phys_t zb,
	const blkptr_t iobp, arc_buf_t abuf, void *private)
	{
	dbuf_prefetch_arg_t *dpa = private;

	dbuf_prefetch_fini(dpa, B_TRUE);
	if (abuf != NULL)
	arc_buf_destroy(abuf, private);
	}

	/*
	* Actually issue the prefetch read for the block given.
	*/
	static void
	dbuf_issue_final_prefetch(dbuf_prefetch_arg_t dpa, blkptr_t bp)
	{
	ASSERT(!BP_IS_REDACTED(bp) \|\|
	dsl_dataset_feature_is_active(
	dpa->dpa_dnode->dn_objset->os_dsl_dataset,
	SPA_FEATURE_REDACTED_DATASETS));

	if (BP_IS_HOLE(bp) \|\| BP_IS_EMBEDDED(bp) \|\| BP_IS_REDACTED(bp))
	return (dbuf_prefetch_fini(dpa, B_FALSE));

	int zio_flags = ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE;
	arc_flags_t aflags =
	dpa->dpa_aflags \| ARC_FLAG_NOWAIT \| ARC_FLAG_PREFETCH \|
	ARC_FLAG_NO_BUF;

	/* dnodes are always read as raw and then converted later */
	if (BP_GET_TYPE(bp) == DMU_OT_DNODE && BP_IS_PROTECTED(bp) &&
	dpa->dpa_curlevel == 0)
	zio_flags \|= ZIO_FLAG_RAW;

	ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp));
	ASSERT3U(dpa->dpa_curlevel, ==, dpa->dpa_zb.zb_level);
	ASSERT(dpa->dpa_zio != NULL);
	(void) arc_read(dpa->dpa_zio, dpa->dpa_spa, bp,
	dbuf_issue_final_prefetch_done, dpa,
	dpa->dpa_prio, zio_flags, &aflags, &dpa->dpa_zb);
	}

	/*
	* Called when an indirect block above our prefetch target is read in. This
	* will either read in the next indirect block down the tree or issue the actual
	* prefetch if the next block down is our target.
	*/
	static void
	dbuf_prefetch_indirect_done(zio_t zio, const zbookmark_phys_t zb,
	const blkptr_t iobp, arc_buf_t abuf, void *private)
	{
	dbuf_prefetch_arg_t *dpa = private;

	ASSERT3S(dpa->dpa_zb.zb_level, <, dpa->dpa_curlevel);
	ASSERT3S(dpa->dpa_curlevel, >, 0);

	if (abuf == NULL) {
	ASSERT(zio == NULL \|\| zio->io_error != 0);
	return (dbuf_prefetch_fini(dpa, B_TRUE));
	}
	ASSERT(zio == NULL \|\| zio->io_error == 0);

	/*
	* The dpa_dnode is only valid if we are called with a NULL
	* zio. This indicates that the arc_read() returned without
	* first calling zio_read() to issue a physical read. Once
	* a physical read is made the dpa_dnode must be invalidated
	* as the locks guarding it may have been dropped. If the
	* dpa_dnode is still valid, then we want to add it to the dbuf
	* cache. To do so, we must hold the dbuf associated with the block
	* we just prefetched, read its contents so that we associate it
	* with an arc_buf_t, and then release it.
	*/
	if (zio != NULL) {
	ASSERT3S(BP_GET_LEVEL(zio->io_bp), ==, dpa->dpa_curlevel);
	if (zio->io_flags & ZIO_FLAG_RAW_COMPRESS) {
	ASSERT3U(BP_GET_PSIZE(zio->io_bp), ==, zio->io_size);
	} else {
	ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, zio->io_size);
	}
	ASSERT3P(zio->io_spa, ==, dpa->dpa_spa);

	dpa->dpa_dnode = NULL;
	} else if (dpa->dpa_dnode != NULL) {
	uint64_t curblkid = dpa->dpa_zb.zb_blkid >>
	(dpa->dpa_epbs * (dpa->dpa_curlevel -
	dpa->dpa_zb.zb_level));
	dmu_buf_impl_t *db = dbuf_hold_level(dpa->dpa_dnode,
	dpa->dpa_curlevel, curblkid, FTAG);
	if (db == NULL) {
	arc_buf_destroy(abuf, private);
	return (dbuf_prefetch_fini(dpa, B_TRUE));
	}
	(void) dbuf_read(db, NULL,
	DB_RF_MUST_SUCCEED \| DB_RF_NOPREFETCH \| DB_RF_HAVESTRUCT);
	dbuf_rele(db, FTAG);
	}

	dpa->dpa_curlevel--;
	uint64_t nextblkid = dpa->dpa_zb.zb_blkid >>
	(dpa->dpa_epbs * (dpa->dpa_curlevel - dpa->dpa_zb.zb_level));
	blkptr_t bp = ((blkptr_t )abuf->b_data) +
	P2PHASE(nextblkid, 1ULL << dpa->dpa_epbs);

	ASSERT(!BP_IS_REDACTED(bp) \|\|
	dsl_dataset_feature_is_active(
	dpa->dpa_dnode->dn_objset->os_dsl_dataset,
	SPA_FEATURE_REDACTED_DATASETS));
	if (BP_IS_HOLE(bp) \|\| BP_IS_REDACTED(bp)) {
	dbuf_prefetch_fini(dpa, B_TRUE);
	} else if (dpa->dpa_curlevel == dpa->dpa_zb.zb_level) {
	ASSERT3U(nextblkid, ==, dpa->dpa_zb.zb_blkid);
	dbuf_issue_final_prefetch(dpa, bp);
	} else {
	arc_flags_t iter_aflags = ARC_FLAG_NOWAIT;
	zbookmark_phys_t zb;

	/* flag if L2ARC eligible, l2arc_noprefetch then decides */
	if (dpa->dpa_aflags & ARC_FLAG_L2CACHE)
	iter_aflags \|= ARC_FLAG_L2CACHE;

	ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp));

	SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset,
	dpa->dpa_zb.zb_object, dpa->dpa_curlevel, nextblkid);

	(void) arc_read(dpa->dpa_zio, dpa->dpa_spa,
	bp, dbuf_prefetch_indirect_done, dpa, dpa->dpa_prio,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE,
	&iter_aflags, &zb);
	}

	arc_buf_destroy(abuf, private);
	}

	/*
	* Issue prefetch reads for the given block on the given level. If the indirect
	* blocks above that block are not in memory, we will read them in
	* asynchronously. As a result, this call never blocks waiting for a read to
	* complete. Note that the prefetch might fail if the dataset is encrypted and
	* the encryption key is unmapped before the IO completes.
	*/
	int
	dbuf_prefetch_impl(dnode_t *dn, int64_t level, uint64_t blkid,
	zio_priority_t prio, arc_flags_t aflags, dbuf_prefetch_fn cb,
	void *arg)
	{
	blkptr_t bp;
	int epbs, nlevels, curlevel;
	uint64_t curblkid;

	ASSERT(blkid != DMU_BONUS_BLKID);
	ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));

	if (blkid > dn->dn_maxblkid)
	goto no_issue;

	if (level == 0 && dnode_block_freed(dn, blkid))
	goto no_issue;

	/*
	* This dnode hasn't been written to disk yet, so there's nothing to
	* prefetch.
	*/
	nlevels = dn->dn_phys->dn_nlevels;
	if (level >= nlevels \|\| dn->dn_phys->dn_nblkptr == 0)
	goto no_issue;

	epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
	if (dn->dn_phys->dn_maxblkid < blkid << (epbs * level))
	goto no_issue;

	dmu_buf_impl_t *db = dbuf_find(dn->dn_objset, dn->dn_object,
	level, blkid);
	if (db != NULL) {
	mutex_exit(&db->db_mtx);
	/*
	* This dbuf already exists. It is either CACHED, or
	* (we assume) about to be read or filled.
	*/
	goto no_issue;
	}

	/*
	* Find the closest ancestor (indirect block) of the target block
	* that is present in the cache. In this indirect block, we will
	* find the bp that is at curlevel, curblkid.
	*/
	curlevel = level;
	curblkid = blkid;
	while (curlevel < nlevels - 1) {
	int parent_level = curlevel + 1;
	uint64_t parent_blkid = curblkid >> epbs;
	dmu_buf_impl_t *db;

	if (dbuf_hold_impl(dn, parent_level, parent_blkid,
	FALSE, TRUE, FTAG, &db) == 0) {
	blkptr_t *bpp = db->db_buf->b_data;
	bp = bpp[P2PHASE(curblkid, 1 << epbs)];
	dbuf_rele(db, FTAG);
	break;
	}

	curlevel = parent_level;
	curblkid = parent_blkid;
	}

	if (curlevel == nlevels - 1) {
	/* No cached indirect blocks found. */
	ASSERT3U(curblkid, <, dn->dn_phys->dn_nblkptr);
	bp = dn->dn_phys->dn_blkptr[curblkid];
	}
	ASSERT(!BP_IS_REDACTED(&bp) \|\|
	dsl_dataset_feature_is_active(dn->dn_objset->os_dsl_dataset,
	SPA_FEATURE_REDACTED_DATASETS));
	if (BP_IS_HOLE(&bp) \|\| BP_IS_REDACTED(&bp))
	goto no_issue;

	ASSERT3U(curlevel, ==, BP_GET_LEVEL(&bp));

	zio_t *pio = zio_root(dmu_objset_spa(dn->dn_objset), NULL, NULL,
	ZIO_FLAG_CANFAIL);

	dbuf_prefetch_arg_t dpa = kmem_zalloc(sizeof (dpa), KM_SLEEP);
	dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset;
	SET_BOOKMARK(&dpa->dpa_zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET,
	dn->dn_object, level, blkid);
	dpa->dpa_curlevel = curlevel;
	dpa->dpa_prio = prio;
	dpa->dpa_aflags = aflags;
	dpa->dpa_spa = dn->dn_objset->os_spa;
	dpa->dpa_dnode = dn;
	dpa->dpa_epbs = epbs;
	dpa->dpa_zio = pio;
	dpa->dpa_cb = cb;
	dpa->dpa_arg = arg;

	/* flag if L2ARC eligible, l2arc_noprefetch then decides */
	if (DNODE_LEVEL_IS_L2CACHEABLE(dn, level))
	dpa->dpa_aflags \|= ARC_FLAG_L2CACHE;

	/*
	* If we have the indirect just above us, no need to do the asynchronous
	* prefetch chain; we'll just run the last step ourselves. If we're at
	* a higher level, though, we want to issue the prefetches for all the
	* indirect blocks asynchronously, so we can go on with whatever we were
	* doing.
	*/
	if (curlevel == level) {
	ASSERT3U(curblkid, ==, blkid);
	dbuf_issue_final_prefetch(dpa, &bp);
	} else {
	arc_flags_t iter_aflags = ARC_FLAG_NOWAIT;
	zbookmark_phys_t zb;

	/* flag if L2ARC eligible, l2arc_noprefetch then decides */
	if (DNODE_LEVEL_IS_L2CACHEABLE(dn, level))
	iter_aflags \|= ARC_FLAG_L2CACHE;

	SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET,
	dn->dn_object, curlevel, curblkid);
	(void) arc_read(dpa->dpa_zio, dpa->dpa_spa,
	&bp, dbuf_prefetch_indirect_done, dpa, prio,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE,
	&iter_aflags, &zb);
	}
	/*
	* We use pio here instead of dpa_zio since it's possible that
	* dpa may have already been freed.
	*/
	zio_nowait(pio);
	return (1);
	no_issue:
	if (cb != NULL)
	cb(arg, B_FALSE);
	return (0);
	}

	int
	dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blkid, zio_priority_t prio,
	arc_flags_t aflags)
	{

	return (dbuf_prefetch_impl(dn, level, blkid, prio, aflags, NULL, NULL));
	}

	/*
	* Helper function for dbuf_hold_impl() to copy a buffer. Handles
	* the case of encrypted, compressed and uncompressed buffers by
	* allocating the new buffer, respectively, with arc_alloc_raw_buf(),
	* arc_alloc_compressed_buf() or arc_alloc_buf().*
	*
	* NOTE: Declared noinline to avoid stack bloat in dbuf_hold_impl().
	*/
	noinline static void
	dbuf_hold_copy(dnode_t dn, dmu_buf_impl_t db)
	{
	dbuf_dirty_record_t *dr = db->db_data_pending;
	arc_buf_t *data = dr->dt.dl.dr_data;
	enum zio_compress compress_type = arc_get_compression(data);
	uint8_t complevel = arc_get_complevel(data);

	if (arc_is_encrypted(data)) {
	boolean_t byteorder;
	uint8_t salt[ZIO_DATA_SALT_LEN];
	uint8_t iv[ZIO_DATA_IV_LEN];
	uint8_t mac[ZIO_DATA_MAC_LEN];

	arc_get_raw_params(data, &byteorder, salt, iv, mac);
	dbuf_set_data(db, arc_alloc_raw_buf(dn->dn_objset->os_spa, db,
	dmu_objset_id(dn->dn_objset), byteorder, salt, iv, mac,
	dn->dn_type, arc_buf_size(data), arc_buf_lsize(data),
	compress_type, complevel));
	} else if (compress_type != ZIO_COMPRESS_OFF) {
	dbuf_set_data(db, arc_alloc_compressed_buf(
	dn->dn_objset->os_spa, db, arc_buf_size(data),
	arc_buf_lsize(data), compress_type, complevel));
	} else {
	dbuf_set_data(db, arc_alloc_buf(dn->dn_objset->os_spa, db,
	DBUF_GET_BUFC_TYPE(db), db->db.db_size));
	}

	rw_enter(&db->db_rwlock, RW_WRITER);
	bcopy(data->b_data, db->db.db_data, arc_buf_size(data));
	rw_exit(&db->db_rwlock);
	}

	/*
	* Returns with db_holds incremented, and db_mtx not held.
	* Note: dn_struct_rwlock must be held.
	*/
	int
	dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid,
	boolean_t fail_sparse, boolean_t fail_uncached,
	void tag, dmu_buf_impl_t *dbp)
	{
	dmu_buf_impl_t db, parent = NULL;

	/* If the pool has been created, verify the tx_sync_lock is not held */
	spa_t *spa = dn->dn_objset->os_spa;
	dsl_pool_t *dp = spa->spa_dsl_pool;
	if (dp != NULL) {
	ASSERT(!MUTEX_HELD(&dp->dp_tx.tx_sync_lock));
	}

	ASSERT(blkid != DMU_BONUS_BLKID);
	ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
	ASSERT3U(dn->dn_nlevels, >, level);

	*dbp = NULL;

	/* dbuf_find() returns with db_mtx held */
	db = dbuf_find(dn->dn_objset, dn->dn_object, level, blkid);

	if (db == NULL) {
	blkptr_t *bp = NULL;
	int err;

	if (fail_uncached)
	return (SET_ERROR(ENOENT));

	ASSERT3P(parent, ==, NULL);
	err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp);
	if (fail_sparse) {
	if (err == 0 && bp && BP_IS_HOLE(bp))
	err = SET_ERROR(ENOENT);
	if (err) {
	if (parent)
	dbuf_rele(parent, NULL);
	return (err);
	}
	}
	if (err && err != ENOENT)
	return (err);
	db = dbuf_create(dn, level, blkid, parent, bp);
	}

	if (fail_uncached && db->db_state != DB_CACHED) {
	mutex_exit(&db->db_mtx);
	return (SET_ERROR(ENOENT));
	}

	if (db->db_buf != NULL) {
	arc_buf_access(db->db_buf);
	ASSERT3P(db->db.db_data, ==, db->db_buf->b_data);
	}

	ASSERT(db->db_buf == NULL \|\| arc_referenced(db->db_buf));

	/*
	* If this buffer is currently syncing out, and we are
	* still referencing it from db_data, we need to make a copy
	* of it in case we decide we want to dirty it again in this txg.
	*/
	if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID &&
	dn->dn_object != DMU_META_DNODE_OBJECT &&
	db->db_state == DB_CACHED && db->db_data_pending) {
	dbuf_dirty_record_t *dr = db->db_data_pending;
	if (dr->dt.dl.dr_data == db->db_buf)
	dbuf_hold_copy(dn, db);
	}

	if (multilist_link_active(&db->db_cache_link)) {
	ASSERT(zfs_refcount_is_zero(&db->db_holds));
	ASSERT(db->db_caching_status == DB_DBUF_CACHE \|\|
	db->db_caching_status == DB_DBUF_METADATA_CACHE);

	multilist_remove(&dbuf_caches[db->db_caching_status].cache, db);
	(void) zfs_refcount_remove_many(
	&dbuf_caches[db->db_caching_status].size,
	db->db.db_size, db);

	if (db->db_caching_status == DB_DBUF_METADATA_CACHE) {
	DBUF_STAT_BUMPDOWN(metadata_cache_count);
	} else {
	DBUF_STAT_BUMPDOWN(cache_levels[db->db_level]);
	DBUF_STAT_BUMPDOWN(cache_count);
	DBUF_STAT_DECR(cache_levels_bytes[db->db_level],
	db->db.db_size);
	}
	db->db_caching_status = DB_NO_CACHE;
	}
	(void) zfs_refcount_add(&db->db_holds, tag);
	DBUF_VERIFY(db);
	mutex_exit(&db->db_mtx);

	/* NOTE: we can't rele the parent until after we drop the db_mtx */
	if (parent)
	dbuf_rele(parent, NULL);

	ASSERT3P(DB_DNODE(db), ==, dn);
	ASSERT3U(db->db_blkid, ==, blkid);
	ASSERT3U(db->db_level, ==, level);
	*dbp = db;

	return (0);
	}

	dmu_buf_impl_t *
	dbuf_hold(dnode_t dn, uint64_t blkid, void tag)
	{
	return (dbuf_hold_level(dn, 0, blkid, tag));
	}

	dmu_buf_impl_t *
	dbuf_hold_level(dnode_t dn, int level, uint64_t blkid, void tag)
	{
	dmu_buf_impl_t *db;
	int err = dbuf_hold_impl(dn, level, blkid, FALSE, FALSE, tag, &db);
	return (err ? NULL : db);
	}

	void
	dbuf_create_bonus(dnode_t *dn)
	{
	ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock));

	ASSERT(dn->dn_bonus == NULL);
	dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL);
	}

	int
	dbuf_spill_set_blksz(dmu_buf_t db_fake, uint64_t blksz, dmu_tx_t tx)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;

	if (db->db_blkid != DMU_SPILL_BLKID)
	return (SET_ERROR(ENOTSUP));
	if (blksz == 0)
	blksz = SPA_MINBLOCKSIZE;
	ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset)));
	blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE);

	dbuf_new_size(db, blksz, tx);

	return (0);
	}

	void
	dbuf_rm_spill(dnode_t dn, dmu_tx_t tx)
	{
	dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx);
	}

	#pragma weak dmu_buf_add_ref = dbuf_add_ref
	void
	dbuf_add_ref(dmu_buf_impl_t db, void tag)
	{
	int64_t holds = zfs_refcount_add(&db->db_holds, tag);
	VERIFY3S(holds, >, 1);
	}

	#pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref
	boolean_t
	dbuf_try_add_ref(dmu_buf_t db_fake, objset_t os, uint64_t obj, uint64_t blkid,
	void *tag)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;
	dmu_buf_impl_t *found_db;
	boolean_t result = B_FALSE;

	if (blkid == DMU_BONUS_BLKID)
	found_db = dbuf_find_bonus(os, obj);
	else
	found_db = dbuf_find(os, obj, 0, blkid);

	if (found_db != NULL) {
	if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) {
	(void) zfs_refcount_add(&db->db_holds, tag);
	result = B_TRUE;
	}
	mutex_exit(&found_db->db_mtx);
	}
	return (result);
	}

	/*
	* If you call dbuf_rele() you had better not be referencing the dnode handle
	* unless you have some other direct or indirect hold on the dnode. (An indirect
	* hold is a hold on one of the dnode's dbufs, including the bonus buffer.)
	* Without that, the dbuf_rele() could lead to a dnode_rele() followed by the
	* dnode's parent dbuf evicting its dnode handles.
	*/
	void
	dbuf_rele(dmu_buf_impl_t db, void tag)
	{
	mutex_enter(&db->db_mtx);
	dbuf_rele_and_unlock(db, tag, B_FALSE);
	}

	void
	dmu_buf_rele(dmu_buf_t db, void tag)
	{
	dbuf_rele((dmu_buf_impl_t *)db, tag);
	}

	/*
	* dbuf_rele() for an already-locked dbuf. This is necessary to allow
	* db_dirtycnt and db_holds to be updated atomically. The 'evicting'
	* argument should be set if we are already in the dbuf-evicting code
	* path, in which case we don't want to recursively evict. This allows us to
	* avoid deeply nested stacks that would have a call flow similar to this:
	*
	* dbuf_rele()-->dbuf_rele_and_unlock()-->dbuf_evict_notify()
	* ^ \|
	* \| \|
	* +-----dbuf_destroy()<--dbuf_evict_one()<--------+
	*
	*/
	void
	dbuf_rele_and_unlock(dmu_buf_impl_t db, void tag, boolean_t evicting)
	{
	int64_t holds;
	uint64_t size;

	ASSERT(MUTEX_HELD(&db->db_mtx));
	DBUF_VERIFY(db);

	/*
	* Remove the reference to the dbuf before removing its hold on the
	* dnode so we can guarantee in dnode_move() that a referenced bonus
	* buffer has a corresponding dnode hold.
	*/
	holds = zfs_refcount_remove(&db->db_holds, tag);
	ASSERT(holds >= 0);

	/*
	* We can't freeze indirects if there is a possibility that they
	* may be modified in the current syncing context.
	*/
	if (db->db_buf != NULL &&
	holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) {
	arc_buf_freeze(db->db_buf);
	}

	if (holds == db->db_dirtycnt &&
	db->db_level == 0 && db->db_user_immediate_evict)
	dbuf_evict_user(db);

	if (holds == 0) {
	if (db->db_blkid == DMU_BONUS_BLKID) {
	dnode_t *dn;
	boolean_t evict_dbuf = db->db_pending_evict;

	/*
	* If the dnode moves here, we cannot cross this
	* barrier until the move completes.
	*/
	DB_DNODE_ENTER(db);

	dn = DB_DNODE(db);
	atomic_dec_32(&dn->dn_dbufs_count);

	/*
	* Decrementing the dbuf count means that the bonus
	* buffer's dnode hold is no longer discounted in
	* dnode_move(). The dnode cannot move until after
	* the dnode_rele() below.
	*/
	DB_DNODE_EXIT(db);

	/*
	* Do not reference db after its lock is dropped.
	* Another thread may evict it.
	*/
	mutex_exit(&db->db_mtx);

	if (evict_dbuf)
	dnode_evict_bonus(dn);

	dnode_rele(dn, db);
	} else if (db->db_buf == NULL) {
	/*
	* This is a special case: we never associated this
	* dbuf with any data allocated from the ARC.
	*/
	ASSERT(db->db_state == DB_UNCACHED \|\|
	db->db_state == DB_NOFILL);
	dbuf_destroy(db);
	} else if (arc_released(db->db_buf)) {
	/*
	* This dbuf has anonymous data associated with it.
	*/
	dbuf_destroy(db);
	} else {
	boolean_t do_arc_evict = B_FALSE;
	blkptr_t bp;
	spa_t *spa = dmu_objset_spa(db->db_objset);

	if (!DBUF_IS_CACHEABLE(db) &&
	db->db_blkptr != NULL &&
	!BP_IS_HOLE(db->db_blkptr) &&
	!BP_IS_EMBEDDED(db->db_blkptr)) {
	do_arc_evict = B_TRUE;
	bp = *db->db_blkptr;
	}

	if (!DBUF_IS_CACHEABLE(db) \|\|
	db->db_pending_evict) {
	dbuf_destroy(db);
	} else if (!multilist_link_active(&db->db_cache_link)) {
	ASSERT3U(db->db_caching_status, ==,
	DB_NO_CACHE);

	dbuf_cached_state_t dcs =
	dbuf_include_in_metadata_cache(db) ?
	DB_DBUF_METADATA_CACHE : DB_DBUF_CACHE;
	db->db_caching_status = dcs;

	multilist_insert(&dbuf_caches[dcs].cache, db);
	uint64_t db_size = db->db.db_size;
	size = zfs_refcount_add_many(
	&dbuf_caches[dcs].size, db_size, db);
	uint8_t db_level = db->db_level;
	mutex_exit(&db->db_mtx);

	if (dcs == DB_DBUF_METADATA_CACHE) {
	DBUF_STAT_BUMP(metadata_cache_count);
	DBUF_STAT_MAX(
	metadata_cache_size_bytes_max,
	size);
	} else {
	DBUF_STAT_BUMP(cache_count);
	DBUF_STAT_MAX(cache_size_bytes_max,
	size);
	DBUF_STAT_BUMP(cache_levels[db_level]);
	DBUF_STAT_INCR(
	cache_levels_bytes[db_level],
	db_size);
	}

	if (dcs == DB_DBUF_CACHE && !evicting)
	dbuf_evict_notify(size);
	}

	if (do_arc_evict)
	arc_freed(spa, &bp);
	}
	} else {
	mutex_exit(&db->db_mtx);
	}

	}

	#pragma weak dmu_buf_refcount = dbuf_refcount
	uint64_t
	dbuf_refcount(dmu_buf_impl_t *db)
	{
	return (zfs_refcount_count(&db->db_holds));
	}

	uint64_t
	dmu_buf_user_refcount(dmu_buf_t *db_fake)
	{
	uint64_t holds;
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;

	mutex_enter(&db->db_mtx);
	ASSERT3U(zfs_refcount_count(&db->db_holds), >=, db->db_dirtycnt);
	holds = zfs_refcount_count(&db->db_holds) - db->db_dirtycnt;
	mutex_exit(&db->db_mtx);

	return (holds);
	}

	void *
	dmu_buf_replace_user(dmu_buf_t db_fake, dmu_buf_user_t old_user,
	dmu_buf_user_t *new_user)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;

	mutex_enter(&db->db_mtx);
	dbuf_verify_user(db, DBVU_NOT_EVICTING);
	if (db->db_user == old_user)
	db->db_user = new_user;
	else
	old_user = db->db_user;
	dbuf_verify_user(db, DBVU_NOT_EVICTING);
	mutex_exit(&db->db_mtx);

	return (old_user);
	}

	void *
	dmu_buf_set_user(dmu_buf_t db_fake, dmu_buf_user_t user)
	{
	return (dmu_buf_replace_user(db_fake, NULL, user));
	}

	void *
	dmu_buf_set_user_ie(dmu_buf_t db_fake, dmu_buf_user_t user)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;

	db->db_user_immediate_evict = TRUE;
	return (dmu_buf_set_user(db_fake, user));
	}

	void *
	dmu_buf_remove_user(dmu_buf_t db_fake, dmu_buf_user_t user)
	{
	return (dmu_buf_replace_user(db_fake, user, NULL));
	}

	void *
	dmu_buf_get_user(dmu_buf_t *db_fake)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )db_fake;

	dbuf_verify_user(db, DBVU_NOT_EVICTING);
	return (db->db_user);
	}

	void
	dmu_buf_user_evict_wait()
	{
	taskq_wait(dbu_evict_taskq);
	}

	blkptr_t *
	dmu_buf_get_blkptr(dmu_buf_t *db)
	{
	dmu_buf_impl_t dbi = (dmu_buf_impl_t )db;
	return (dbi->db_blkptr);
	}

	objset_t *
	dmu_buf_get_objset(dmu_buf_t *db)
	{
	dmu_buf_impl_t dbi = (dmu_buf_impl_t )db;
	return (dbi->db_objset);
	}

	dnode_t *
	dmu_buf_dnode_enter(dmu_buf_t *db)
	{
	dmu_buf_impl_t dbi = (dmu_buf_impl_t )db;
	DB_DNODE_ENTER(dbi);
	return (DB_DNODE(dbi));
	}

	void
	dmu_buf_dnode_exit(dmu_buf_t *db)
	{
	dmu_buf_impl_t dbi = (dmu_buf_impl_t )db;
	DB_DNODE_EXIT(dbi);
	}

	static void
	dbuf_check_blkptr(dnode_t dn, dmu_buf_impl_t db)
	{
	/* ASSERT(dmu_tx_is_syncing(tx) */
	ASSERT(MUTEX_HELD(&db->db_mtx));

	if (db->db_blkptr != NULL)
	return;

	if (db->db_blkid == DMU_SPILL_BLKID) {
	db->db_blkptr = DN_SPILL_BLKPTR(dn->dn_phys);
	BP_ZERO(db->db_blkptr);
	return;
	}
	if (db->db_level == dn->dn_phys->dn_nlevels-1) {
	/*
	* This buffer was allocated at a time when there was
	* no available blkptrs from the dnode, or it was
	* inappropriate to hook it in (i.e., nlevels mismatch).
	*/
	ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr);
	ASSERT(db->db_parent == NULL);
	db->db_parent = dn->dn_dbuf;
	db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid];
	DBUF_VERIFY(db);
	} else {
	dmu_buf_impl_t *parent = db->db_parent;
	int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;

	ASSERT(dn->dn_phys->dn_nlevels > 1);
	if (parent == NULL) {
	mutex_exit(&db->db_mtx);
	rw_enter(&dn->dn_struct_rwlock, RW_READER);
	parent = dbuf_hold_level(dn, db->db_level + 1,
	db->db_blkid >> epbs, db);
	rw_exit(&dn->dn_struct_rwlock);
	mutex_enter(&db->db_mtx);
	db->db_parent = parent;
	}
	db->db_blkptr = (blkptr_t *)parent->db.db_data +
	(db->db_blkid & ((1ULL << epbs) - 1));
	DBUF_VERIFY(db);
	}
	}

	static void
	dbuf_sync_bonus(dbuf_dirty_record_t dr, dmu_tx_t tx)
	{
	dmu_buf_impl_t *db = dr->dr_dbuf;
	void *data = dr->dt.dl.dr_data;

	ASSERT0(db->db_level);
	ASSERT(MUTEX_HELD(&db->db_mtx));
	ASSERT(db->db_blkid == DMU_BONUS_BLKID);
	ASSERT(data != NULL);

	dnode_t *dn = dr->dr_dnode;
	ASSERT3U(DN_MAX_BONUS_LEN(dn->dn_phys), <=,
	DN_SLOTS_TO_BONUSLEN(dn->dn_phys->dn_extra_slots + 1));
	bcopy(data, DN_BONUS(dn->dn_phys), DN_MAX_BONUS_LEN(dn->dn_phys));

	dbuf_sync_leaf_verify_bonus_dnode(dr);

	dbuf_undirty_bonus(dr);
	dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg, B_FALSE);
	}

	/*
	* When syncing out a blocks of dnodes, adjust the block to deal with
	* encryption. Normally, we make sure the block is decrypted before writing
	* it. If we have crypt params, then we are writing a raw (encrypted) block,
	* from a raw receive. In this case, set the ARC buf's crypt params so
	* that the BP will be filled with the correct byteorder, salt, iv, and mac.
	*/
	static void
	dbuf_prepare_encrypted_dnode_leaf(dbuf_dirty_record_t *dr)
	{
	int err;
	dmu_buf_impl_t *db = dr->dr_dbuf;

	ASSERT(MUTEX_HELD(&db->db_mtx));
	ASSERT3U(db->db.db_object, ==, DMU_META_DNODE_OBJECT);
	ASSERT3U(db->db_level, ==, 0);

	if (!db->db_objset->os_raw_receive && arc_is_encrypted(db->db_buf)) {
	zbookmark_phys_t zb;

	/*
	* Unfortunately, there is currently no mechanism for
	* syncing context to handle decryption errors. An error
	* here is only possible if an attacker maliciously
	* changed a dnode block and updated the associated
	* checksums going up the block tree.
	*/
	SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
	db->db.db_object, db->db_level, db->db_blkid);
	err = arc_untransform(db->db_buf, db->db_objset->os_spa,
	&zb, B_TRUE);
	if (err)
	panic("Invalid dnode block MAC");
	} else if (dr->dt.dl.dr_has_raw_params) {
	(void) arc_release(dr->dt.dl.dr_data, db);
	arc_convert_to_raw(dr->dt.dl.dr_data,
	dmu_objset_id(db->db_objset),
	dr->dt.dl.dr_byteorder, DMU_OT_DNODE,
	dr->dt.dl.dr_salt, dr->dt.dl.dr_iv, dr->dt.dl.dr_mac);
	}
	}

	/*
	* dbuf_sync_indirect() is called recursively from dbuf_sync_list() so it
	* is critical the we not allow the compiler to inline this function in to
	* dbuf_sync_list() thereby drastically bloating the stack usage.
	*/
	noinline static void
	dbuf_sync_indirect(dbuf_dirty_record_t dr, dmu_tx_t tx)
	{
	dmu_buf_impl_t *db = dr->dr_dbuf;
	dnode_t *dn = dr->dr_dnode;

	ASSERT(dmu_tx_is_syncing(tx));

	dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr);

	mutex_enter(&db->db_mtx);

	ASSERT(db->db_level > 0);
	DBUF_VERIFY(db);

	/* Read the block if it hasn't been read yet. */
	if (db->db_buf == NULL) {
	mutex_exit(&db->db_mtx);
	(void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED);
	mutex_enter(&db->db_mtx);
	}
	ASSERT3U(db->db_state, ==, DB_CACHED);
	ASSERT(db->db_buf != NULL);

	/* Indirect block size must match what the dnode thinks it is. */
	ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift);
	dbuf_check_blkptr(dn, db);

	/* Provide the pending dirty record to child dbufs */
	db->db_data_pending = dr;

	mutex_exit(&db->db_mtx);

	dbuf_write(dr, db->db_buf, tx);

	zio_t *zio = dr->dr_zio;
	mutex_enter(&dr->dt.di.dr_mtx);
	dbuf_sync_list(&dr->dt.di.dr_children, db->db_level - 1, tx);
	ASSERT(list_head(&dr->dt.di.dr_children) == NULL);
	mutex_exit(&dr->dt.di.dr_mtx);
	zio_nowait(zio);
	}

	/*
	* Verify that the size of the data in our bonus buffer does not exceed
	* its recorded size.
	*
	* The purpose of this verification is to catch any cases in development
	* where the size of a phys structure (i.e space_map_phys_t) grows and,
	* due to incorrect feature management, older pools expect to read more
	* data even though they didn't actually write it to begin with.
	*
	* For a example, this would catch an error in the feature logic where we
	* open an older pool and we expect to write the space map histogram of
	* a space map with size SPACE_MAP_SIZE_V0.
	*/
	static void
	dbuf_sync_leaf_verify_bonus_dnode(dbuf_dirty_record_t *dr)
	{
	#ifdef ZFS_DEBUG
	dnode_t *dn = dr->dr_dnode;

	/*
	* Encrypted bonus buffers can have data past their bonuslen.
	* Skip the verification of these blocks.
	*/
	if (DMU_OT_IS_ENCRYPTED(dn->dn_bonustype))
	return;

	uint16_t bonuslen = dn->dn_phys->dn_bonuslen;
	uint16_t maxbonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
	ASSERT3U(bonuslen, <=, maxbonuslen);

	arc_buf_t *datap = dr->dt.dl.dr_data;
	char datap_end = ((char )datap) + bonuslen;
	char datap_max = ((char )datap) + maxbonuslen;

	/* ensure that everything is zero after our data */
	for (; datap_end < datap_max; datap_end++)
	ASSERT(*datap_end == 0);
	#endif
	}

	static blkptr_t *
	dbuf_lightweight_bp(dbuf_dirty_record_t *dr)
	{
	/* This must be a lightweight dirty record. */
	ASSERT3P(dr->dr_dbuf, ==, NULL);
	dnode_t *dn = dr->dr_dnode;

	if (dn->dn_phys->dn_nlevels == 1) {
	VERIFY3U(dr->dt.dll.dr_blkid, <, dn->dn_phys->dn_nblkptr);
	return (&dn->dn_phys->dn_blkptr[dr->dt.dll.dr_blkid]);
	} else {
	dmu_buf_impl_t *parent_db = dr->dr_parent->dr_dbuf;
	int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
	VERIFY3U(parent_db->db_level, ==, 1);
	VERIFY3P(parent_db->db_dnode_handle->dnh_dnode, ==, dn);
	VERIFY3U(dr->dt.dll.dr_blkid >> epbs, ==, parent_db->db_blkid);
	blkptr_t *bp = parent_db->db.db_data;
	return (&bp[dr->dt.dll.dr_blkid & ((1 << epbs) - 1)]);
	}
	}

	static void
	dbuf_lightweight_ready(zio_t *zio)
	{
	dbuf_dirty_record_t *dr = zio->io_private;
	blkptr_t *bp = zio->io_bp;

	if (zio->io_error != 0)
	return;

	dnode_t *dn = dr->dr_dnode;

	blkptr_t *bp_orig = dbuf_lightweight_bp(dr);
	spa_t *spa = dmu_objset_spa(dn->dn_objset);
	int64_t delta = bp_get_dsize_sync(spa, bp) -
	bp_get_dsize_sync(spa, bp_orig);
	dnode_diduse_space(dn, delta);

	uint64_t blkid = dr->dt.dll.dr_blkid;
	mutex_enter(&dn->dn_mtx);
	if (blkid > dn->dn_phys->dn_maxblkid) {
	ASSERT0(dn->dn_objset->os_raw_receive);
	dn->dn_phys->dn_maxblkid = blkid;
	}
	mutex_exit(&dn->dn_mtx);

	if (!BP_IS_EMBEDDED(bp)) {
	uint64_t fill = BP_IS_HOLE(bp) ? 0 : 1;
	BP_SET_FILL(bp, fill);
	}

	dmu_buf_impl_t *parent_db;
	EQUIV(dr->dr_parent == NULL, dn->dn_phys->dn_nlevels == 1);
	if (dr->dr_parent == NULL) {
	parent_db = dn->dn_dbuf;
	} else {
	parent_db = dr->dr_parent->dr_dbuf;
	}
	rw_enter(&parent_db->db_rwlock, RW_WRITER);
	bp_orig = bp;
	rw_exit(&parent_db->db_rwlock);
	}

	static void
	dbuf_lightweight_physdone(zio_t *zio)
	{
	dbuf_dirty_record_t *dr = zio->io_private;
	dsl_pool_t *dp = spa_get_dsl(zio->io_spa);
	ASSERT3U(dr->dr_txg, ==, zio->io_txg);

	/*
	* The callback will be called io_phys_children times. Retire one
	* portion of our dirty space each time we are called. Any rounding
	* error will be cleaned up by dbuf_lightweight_done().
	*/
	int delta = dr->dr_accounted / zio->io_phys_children;
	dsl_pool_undirty_space(dp, delta, zio->io_txg);
	}

	static void
	dbuf_lightweight_done(zio_t *zio)
	{
	dbuf_dirty_record_t *dr = zio->io_private;

	VERIFY0(zio->io_error);

	objset_t *os = dr->dr_dnode->dn_objset;
	dmu_tx_t *tx = os->os_synctx;

	if (zio->io_flags & (ZIO_FLAG_IO_REWRITE \| ZIO_FLAG_NOPWRITE)) {
	ASSERT(BP_EQUAL(zio->io_bp, &zio->io_bp_orig));
	} else {
	dsl_dataset_t *ds = os->os_dsl_dataset;
	(void) dsl_dataset_block_kill(ds, &zio->io_bp_orig, tx, B_TRUE);
	dsl_dataset_block_born(ds, zio->io_bp, tx);
	}

	/*
	* See comment in dbuf_write_done().
	*/
	if (zio->io_phys_children == 0) {
	dsl_pool_undirty_space(dmu_objset_pool(os),
	dr->dr_accounted, zio->io_txg);
	} else {
	dsl_pool_undirty_space(dmu_objset_pool(os),
	dr->dr_accounted % zio->io_phys_children, zio->io_txg);
	}

	abd_free(dr->dt.dll.dr_abd);
	kmem_free(dr, sizeof (*dr));
	}

	noinline static void
	dbuf_sync_lightweight(dbuf_dirty_record_t dr, dmu_tx_t tx)
	{
	dnode_t *dn = dr->dr_dnode;
	zio_t *pio;
	if (dn->dn_phys->dn_nlevels == 1) {
	pio = dn->dn_zio;
	} else {
	pio = dr->dr_parent->dr_zio;
	}

	zbookmark_phys_t zb = {
	.zb_objset = dmu_objset_id(dn->dn_objset),
	.zb_object = dn->dn_object,
	.zb_level = 0,
	.zb_blkid = dr->dt.dll.dr_blkid,
	};

	/*
	* See comment in dbuf_write(). This is so that zio->io_bp_orig
	* will have the old BP in dbuf_lightweight_done().
	*/
	dr->dr_bp_copy = *dbuf_lightweight_bp(dr);

	dr->dr_zio = zio_write(pio, dmu_objset_spa(dn->dn_objset),
	dmu_tx_get_txg(tx), &dr->dr_bp_copy, dr->dt.dll.dr_abd,
	dn->dn_datablksz, abd_get_size(dr->dt.dll.dr_abd),
	&dr->dt.dll.dr_props, dbuf_lightweight_ready, NULL,
	dbuf_lightweight_physdone, dbuf_lightweight_done, dr,
	ZIO_PRIORITY_ASYNC_WRITE,
	ZIO_FLAG_MUSTSUCCEED \| dr->dt.dll.dr_flags, &zb);

	zio_nowait(dr->dr_zio);
	}

	/*
	* dbuf_sync_leaf() is called recursively from dbuf_sync_list() so it is
	* critical the we not allow the compiler to inline this function in to
	* dbuf_sync_list() thereby drastically bloating the stack usage.
	*/
	noinline static void
	dbuf_sync_leaf(dbuf_dirty_record_t dr, dmu_tx_t tx)
	{
	arc_buf_t **datap = &dr->dt.dl.dr_data;
	dmu_buf_impl_t *db = dr->dr_dbuf;
	dnode_t *dn = dr->dr_dnode;
	objset_t *os;
	uint64_t txg = tx->tx_txg;

	ASSERT(dmu_tx_is_syncing(tx));

	dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr);

	mutex_enter(&db->db_mtx);
	/*
	* To be synced, we must be dirtied. But we
	* might have been freed after the dirty.
	*/
	if (db->db_state == DB_UNCACHED) {
	/* This buffer has been freed since it was dirtied */
	ASSERT(db->db.db_data == NULL);
	} else if (db->db_state == DB_FILL) {
	/* This buffer was freed and is now being re-filled */
	ASSERT(db->db.db_data != dr->dt.dl.dr_data);
	} else {
	ASSERT(db->db_state == DB_CACHED \|\| db->db_state == DB_NOFILL);
	}
	DBUF_VERIFY(db);

	if (db->db_blkid == DMU_SPILL_BLKID) {
	mutex_enter(&dn->dn_mtx);
	if (!(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) {
	/*
	* In the previous transaction group, the bonus buffer
	* was entirely used to store the attributes for the
	* dnode which overrode the dn_spill field. However,
	* when adding more attributes to the file a spill
	* block was required to hold the extra attributes.
	*
	* Make sure to clear the garbage left in the dn_spill
	* field from the previous attributes in the bonus
	* buffer. Otherwise, after writing out the spill
	* block to the new allocated dva, it will free
	* the old block pointed to by the invalid dn_spill.
	*/
	db->db_blkptr = NULL;
	}
	dn->dn_phys->dn_flags \|= DNODE_FLAG_SPILL_BLKPTR;
	mutex_exit(&dn->dn_mtx);
	}

	/*
	* If this is a bonus buffer, simply copy the bonus data into the
	* dnode. It will be written out when the dnode is synced (and it
	* will be synced, since it must have been dirty for dbuf_sync to
	* be called).
	*/
	if (db->db_blkid == DMU_BONUS_BLKID) {
	ASSERT(dr->dr_dbuf == db);
	dbuf_sync_bonus(dr, tx);
	return;
	}

	os = dn->dn_objset;

	/*
	* This function may have dropped the db_mtx lock allowing a dmu_sync
	* operation to sneak in. As a result, we need to ensure that we
	* don't check the dr_override_state until we have returned from
	* dbuf_check_blkptr.
	*/
	dbuf_check_blkptr(dn, db);

	/*
	* If this buffer is in the middle of an immediate write,
	* wait for the synchronous IO to complete.
	*/
	while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) {
	ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
	cv_wait(&db->db_changed, &db->db_mtx);
	ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN);
	}

	/*
	* If this is a dnode block, ensure it is appropriately encrypted
	* or decrypted, depending on what we are writing to it this txg.
	*/
	if (os->os_encrypted && dn->dn_object == DMU_META_DNODE_OBJECT)
	dbuf_prepare_encrypted_dnode_leaf(dr);

	if (db->db_state != DB_NOFILL &&
	dn->dn_object != DMU_META_DNODE_OBJECT &&
	zfs_refcount_count(&db->db_holds) > 1 &&
	dr->dt.dl.dr_override_state != DR_OVERRIDDEN &&
	*datap == db->db_buf) {
	/*
	* If this buffer is currently "in use" (i.e., there
	* are active holds and db_data still references it),
	* then make a copy before we start the write so that
	* any modifications from the open txg will not leak
	* into this write.
	*
	* NOTE: this copy does not need to be made for
	* objects only modified in the syncing context (e.g.
	* DNONE_DNODE blocks).
	*/
	int psize = arc_buf_size(*datap);
	int lsize = arc_buf_lsize(*datap);
	arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
	enum zio_compress compress_type = arc_get_compression(*datap);
	uint8_t complevel = arc_get_complevel(*datap);

	if (arc_is_encrypted(*datap)) {
	boolean_t byteorder;
	uint8_t salt[ZIO_DATA_SALT_LEN];
	uint8_t iv[ZIO_DATA_IV_LEN];
	uint8_t mac[ZIO_DATA_MAC_LEN];

	arc_get_raw_params(*datap, &byteorder, salt, iv, mac);
	*datap = arc_alloc_raw_buf(os->os_spa, db,
	dmu_objset_id(os), byteorder, salt, iv, mac,
	dn->dn_type, psize, lsize, compress_type,
	complevel);
	} else if (compress_type != ZIO_COMPRESS_OFF) {
	ASSERT3U(type, ==, ARC_BUFC_DATA);
	*datap = arc_alloc_compressed_buf(os->os_spa, db,
	psize, lsize, compress_type, complevel);
	} else {
	*datap = arc_alloc_buf(os->os_spa, db, type, psize);
	}
	bcopy(db->db.db_data, (*datap)->b_data, psize);
	}
	db->db_data_pending = dr;

	mutex_exit(&db->db_mtx);

	dbuf_write(dr, *datap, tx);

	ASSERT(!list_link_active(&dr->dr_dirty_node));
	if (dn->dn_object == DMU_META_DNODE_OBJECT) {
	list_insert_tail(&dn->dn_dirty_records[txg & TXG_MASK], dr);
	} else {
	zio_nowait(dr->dr_zio);
	}
	}

	void
	dbuf_sync_list(list_t list, int level, dmu_tx_t tx)
	{
	dbuf_dirty_record_t *dr;

	while ((dr = list_head(list))) {
	if (dr->dr_zio != NULL) {
	/*
	* If we find an already initialized zio then we
	* are processing the meta-dnode, and we have finished.
	* The dbufs for all dnodes are put back on the list
	* during processing, so that we can zio_wait()
	* these IOs after initiating all child IOs.
	*/
	ASSERT3U(dr->dr_dbuf->db.db_object, ==,
	DMU_META_DNODE_OBJECT);
	break;
	}
	list_remove(list, dr);
	if (dr->dr_dbuf == NULL) {
	dbuf_sync_lightweight(dr, tx);
	} else {
	if (dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID &&
	dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) {
	VERIFY3U(dr->dr_dbuf->db_level, ==, level);
	}
	if (dr->dr_dbuf->db_level > 0)
	dbuf_sync_indirect(dr, tx);
	else
	dbuf_sync_leaf(dr, tx);
	}
	}
	}

	/* ARGSUSED */
	static void
	dbuf_write_ready(zio_t zio, arc_buf_t buf, void *vdb)
	{
	dmu_buf_impl_t *db = vdb;
	dnode_t *dn;
	blkptr_t *bp = zio->io_bp;
	blkptr_t *bp_orig = &zio->io_bp_orig;
	spa_t *spa = zio->io_spa;
	int64_t delta;
	uint64_t fill = 0;
	int i;

	ASSERT3P(db->db_blkptr, !=, NULL);
	ASSERT3P(&db->db_data_pending->dr_bp_copy, ==, bp);

	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig);
	dnode_diduse_space(dn, delta - zio->io_prev_space_delta);
	zio->io_prev_space_delta = delta;

	if (bp->blk_birth != 0) {
	ASSERT((db->db_blkid != DMU_SPILL_BLKID &&
	BP_GET_TYPE(bp) == dn->dn_type) \|\|
	(db->db_blkid == DMU_SPILL_BLKID &&
	BP_GET_TYPE(bp) == dn->dn_bonustype) \|\|
	BP_IS_EMBEDDED(bp));
	ASSERT(BP_GET_LEVEL(bp) == db->db_level);
	}

	mutex_enter(&db->db_mtx);

	#ifdef ZFS_DEBUG
	if (db->db_blkid == DMU_SPILL_BLKID) {
	ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR);
	ASSERT(!(BP_IS_HOLE(bp)) &&
	db->db_blkptr == DN_SPILL_BLKPTR(dn->dn_phys));
	}
	#endif

	if (db->db_level == 0) {
	mutex_enter(&dn->dn_mtx);
	if (db->db_blkid > dn->dn_phys->dn_maxblkid &&
	db->db_blkid != DMU_SPILL_BLKID) {
	ASSERT0(db->db_objset->os_raw_receive);
	dn->dn_phys->dn_maxblkid = db->db_blkid;
	}
	mutex_exit(&dn->dn_mtx);

	if (dn->dn_type == DMU_OT_DNODE) {
	i = 0;
	while (i < db->db.db_size) {
	dnode_phys_t *dnp =
	(void )(((char )db->db.db_data) + i);

	i += DNODE_MIN_SIZE;
	if (dnp->dn_type != DMU_OT_NONE) {
	fill++;
	i += dnp->dn_extra_slots *
	DNODE_MIN_SIZE;
	}
	}
	} else {
	if (BP_IS_HOLE(bp)) {
	fill = 0;
	} else {
	fill = 1;
	}
	}
	} else {
	blkptr_t *ibp = db->db.db_data;
	ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift);
	for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) {
	if (BP_IS_HOLE(ibp))
	continue;
	fill += BP_GET_FILL(ibp);
	}
	}
	DB_DNODE_EXIT(db);

	if (!BP_IS_EMBEDDED(bp))
	BP_SET_FILL(bp, fill);

	mutex_exit(&db->db_mtx);

	db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_WRITER, FTAG);
	db->db_blkptr = bp;
	dmu_buf_unlock_parent(db, dblt, FTAG);
	}

	/* ARGSUSED */
	/*
	* This function gets called just prior to running through the compression
	* stage of the zio pipeline. If we're an indirect block comprised of only
	* holes, then we want this indirect to be compressed away to a hole. In
	* order to do that we must zero out any information about the holes that
	* this indirect points to prior to before we try to compress it.
	*/
	static void
	dbuf_write_children_ready(zio_t zio, arc_buf_t buf, void *vdb)
	{
	dmu_buf_impl_t *db = vdb;
	dnode_t *dn;
	blkptr_t *bp;
	unsigned int epbs, i;

	ASSERT3U(db->db_level, >, 0);
	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);
	epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
	ASSERT3U(epbs, <, 31);

	/* Determine if all our children are holes */
	for (i = 0, bp = db->db.db_data; i < 1ULL << epbs; i++, bp++) {
	if (!BP_IS_HOLE(bp))
	break;
	}

	/*
	* If all the children are holes, then zero them all out so that
	* we may get compressed away.
	*/
	if (i == 1ULL << epbs) {
	/*
	* We only found holes. Grab the rwlock to prevent
	* anybody from reading the blocks we're about to
	* zero out.
	*/
	rw_enter(&db->db_rwlock, RW_WRITER);
	bzero(db->db.db_data, db->db.db_size);
	rw_exit(&db->db_rwlock);
	}
	DB_DNODE_EXIT(db);
	}

	/*
	* The SPA will call this callback several times for each zio - once
	* for every physical child i/o (zio->io_phys_children times). This
	* allows the DMU to monitor the progress of each logical i/o. For example,
	* there may be 2 copies of an indirect block, or many fragments of a RAID-Z
	* block. There may be a long delay before all copies/fragments are completed,
	* so this callback allows us to retire dirty space gradually, as the physical
	* i/os complete.
	*/
	/* ARGSUSED */
	static void
	dbuf_write_physdone(zio_t zio, arc_buf_t buf, void *arg)
	{
	dmu_buf_impl_t *db = arg;
	objset_t *os = db->db_objset;
	dsl_pool_t *dp = dmu_objset_pool(os);
	dbuf_dirty_record_t *dr;
	int delta = 0;

	dr = db->db_data_pending;
	ASSERT3U(dr->dr_txg, ==, zio->io_txg);

	/*
	* The callback will be called io_phys_children times. Retire one
	* portion of our dirty space each time we are called. Any rounding
	* error will be cleaned up by dbuf_write_done().
	*/
	delta = dr->dr_accounted / zio->io_phys_children;
	dsl_pool_undirty_space(dp, delta, zio->io_txg);
	}

	/* ARGSUSED */
	static void
	dbuf_write_done(zio_t zio, arc_buf_t buf, void *vdb)
	{
	dmu_buf_impl_t *db = vdb;
	blkptr_t *bp_orig = &zio->io_bp_orig;
	blkptr_t *bp = db->db_blkptr;
	objset_t *os = db->db_objset;
	dmu_tx_t *tx = os->os_synctx;

	ASSERT0(zio->io_error);
	ASSERT(db->db_blkptr == bp);

	/*
	* For nopwrites and rewrites we ensure that the bp matches our
	* original and bypass all the accounting.
	*/
	if (zio->io_flags & (ZIO_FLAG_IO_REWRITE \| ZIO_FLAG_NOPWRITE)) {
	ASSERT(BP_EQUAL(bp, bp_orig));
	} else {
	dsl_dataset_t *ds = os->os_dsl_dataset;
	(void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
	dsl_dataset_block_born(ds, bp, tx);
	}

	mutex_enter(&db->db_mtx);

	DBUF_VERIFY(db);

	dbuf_dirty_record_t *dr = db->db_data_pending;
	dnode_t *dn = dr->dr_dnode;
	ASSERT(!list_link_active(&dr->dr_dirty_node));
	ASSERT(dr->dr_dbuf == db);
	ASSERT(list_next(&db->db_dirty_records, dr) == NULL);
	list_remove(&db->db_dirty_records, dr);

	#ifdef ZFS_DEBUG
	if (db->db_blkid == DMU_SPILL_BLKID) {
	ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR);
	ASSERT(!(BP_IS_HOLE(db->db_blkptr)) &&
	db->db_blkptr == DN_SPILL_BLKPTR(dn->dn_phys));
	}
	#endif

	if (db->db_level == 0) {
	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
	ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN);
	if (db->db_state != DB_NOFILL) {
	if (dr->dt.dl.dr_data != db->db_buf)
	arc_buf_destroy(dr->dt.dl.dr_data, db);
	}
	} else {
	ASSERT(list_head(&dr->dt.di.dr_children) == NULL);
	ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift);
	if (!BP_IS_HOLE(db->db_blkptr)) {
	int epbs __maybe_unused = dn->dn_phys->dn_indblkshift -
	SPA_BLKPTRSHIFT;
	ASSERT3U(db->db_blkid, <=,
	dn->dn_phys->dn_maxblkid >> (db->db_level * epbs));
	ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==,
	db->db.db_size);
	}
	mutex_destroy(&dr->dt.di.dr_mtx);
	list_destroy(&dr->dt.di.dr_children);
	}

	cv_broadcast(&db->db_changed);
	ASSERT(db->db_dirtycnt > 0);
	db->db_dirtycnt -= 1;
	db->db_data_pending = NULL;
	dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg, B_FALSE);

	/*
	* If we didn't do a physical write in this ZIO and we
	* still ended up here, it means that the space of the
	* dbuf that we just released (and undirtied) above hasn't
	* been marked as undirtied in the pool's accounting.
	*
	* Thus, we undirty that space in the pool's view of the
	* world here. For physical writes this type of update
	* happens in dbuf_write_physdone().
	*
	* If we did a physical write, cleanup any rounding errors
	* that came up due to writing multiple copies of a block
	* on disk [see dbuf_write_physdone()].
	*/
	if (zio->io_phys_children == 0) {
	dsl_pool_undirty_space(dmu_objset_pool(os),
	dr->dr_accounted, zio->io_txg);
	} else {
	dsl_pool_undirty_space(dmu_objset_pool(os),
	dr->dr_accounted % zio->io_phys_children, zio->io_txg);
	}

	kmem_free(dr, sizeof (dbuf_dirty_record_t));
	}

	static void
	dbuf_write_nofill_ready(zio_t *zio)
	{
	dbuf_write_ready(zio, NULL, zio->io_private);
	}

	static void
	dbuf_write_nofill_done(zio_t *zio)
	{
	dbuf_write_done(zio, NULL, zio->io_private);
	}

	static void
	dbuf_write_override_ready(zio_t *zio)
	{
	dbuf_dirty_record_t *dr = zio->io_private;
	dmu_buf_impl_t *db = dr->dr_dbuf;

	dbuf_write_ready(zio, NULL, db);
	}

	static void
	dbuf_write_override_done(zio_t *zio)
	{
	dbuf_dirty_record_t *dr = zio->io_private;
	dmu_buf_impl_t *db = dr->dr_dbuf;
	blkptr_t *obp = &dr->dt.dl.dr_overridden_by;

	mutex_enter(&db->db_mtx);
	if (!BP_EQUAL(zio->io_bp, obp)) {
	if (!BP_IS_HOLE(obp))
	dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp);
	arc_release(dr->dt.dl.dr_data, db);
	}
	mutex_exit(&db->db_mtx);

	dbuf_write_done(zio, NULL, db);

	if (zio->io_abd != NULL)
	abd_free(zio->io_abd);
	}

	typedef struct dbuf_remap_impl_callback_arg {
	objset_t *drica_os;
	uint64_t drica_blk_birth;
	dmu_tx_t *drica_tx;
	} dbuf_remap_impl_callback_arg_t;

	static void
	dbuf_remap_impl_callback(uint64_t vdev, uint64_t offset, uint64_t size,
	void *arg)
	{
	dbuf_remap_impl_callback_arg_t *drica = arg;
	objset_t *os = drica->drica_os;
	spa_t *spa = dmu_objset_spa(os);
	dmu_tx_t *tx = drica->drica_tx;

	ASSERT(dsl_pool_sync_context(spa_get_dsl(spa)));

	if (os == spa_meta_objset(spa)) {
	spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx);
	} else {
	dsl_dataset_block_remapped(dmu_objset_ds(os), vdev, offset,
	size, drica->drica_blk_birth, tx);
	}
	}

	static void
	dbuf_remap_impl(dnode_t dn, blkptr_t bp, krwlock_t rw, dmu_tx_t tx)
	{
	blkptr_t bp_copy = *bp;
	spa_t *spa = dmu_objset_spa(dn->dn_objset);
	dbuf_remap_impl_callback_arg_t drica;

	ASSERT(dsl_pool_sync_context(spa_get_dsl(spa)));

	drica.drica_os = dn->dn_objset;
	drica.drica_blk_birth = bp->blk_birth;
	drica.drica_tx = tx;
	if (spa_remap_blkptr(spa, &bp_copy, dbuf_remap_impl_callback,
	&drica)) {
	/*
	* If the blkptr being remapped is tracked by a livelist,
	* then we need to make sure the livelist reflects the update.
	* First, cancel out the old blkptr by appending a 'FREE'
	* entry. Next, add an 'ALLOC' to track the new version. This
	* way we avoid trying to free an inaccurate blkptr at delete.
	* Note that embedded blkptrs are not tracked in livelists.
	*/
	if (dn->dn_objset != spa_meta_objset(spa)) {
	dsl_dataset_t *ds = dmu_objset_ds(dn->dn_objset);
	if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
	bp->blk_birth > ds->ds_dir->dd_origin_txg) {
	ASSERT(!BP_IS_EMBEDDED(bp));
	ASSERT(dsl_dir_is_clone(ds->ds_dir));
	ASSERT(spa_feature_is_enabled(spa,
	SPA_FEATURE_LIVELIST));
	bplist_append(&ds->ds_dir->dd_pending_frees,
	bp);
	bplist_append(&ds->ds_dir->dd_pending_allocs,
	&bp_copy);
	}
	}

	/*
	* The db_rwlock prevents dbuf_read_impl() from
	* dereferencing the BP while we are changing it. To
	* avoid lock contention, only grab it when we are actually
	* changing the BP.
	*/
	if (rw != NULL)
	rw_enter(rw, RW_WRITER);
	*bp = bp_copy;
	if (rw != NULL)
	rw_exit(rw);
	}
	}

	/*
	* Remap any existing BP's to concrete vdevs, if possible.
	*/
	static void
	dbuf_remap(dnode_t dn, dmu_buf_impl_t db, dmu_tx_t *tx)
	{
	spa_t *spa = dmu_objset_spa(db->db_objset);
	ASSERT(dsl_pool_sync_context(spa_get_dsl(spa)));

	if (!spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL))
	return;

	if (db->db_level > 0) {
	blkptr_t *bp = db->db.db_data;
	for (int i = 0; i < db->db.db_size >> SPA_BLKPTRSHIFT; i++) {
	dbuf_remap_impl(dn, &bp[i], &db->db_rwlock, tx);
	}
	} else if (db->db.db_object == DMU_META_DNODE_OBJECT) {
	dnode_phys_t *dnp = db->db.db_data;
	ASSERT3U(db->db_dnode_handle->dnh_dnode->dn_type, ==,
	DMU_OT_DNODE);
	for (int i = 0; i < db->db.db_size >> DNODE_SHIFT;
	i += dnp[i].dn_extra_slots + 1) {
	for (int j = 0; j < dnp[i].dn_nblkptr; j++) {
	krwlock_t *lock = (dn->dn_dbuf == NULL ? NULL :
	&dn->dn_dbuf->db_rwlock);
	dbuf_remap_impl(dn, &dnp[i].dn_blkptr[j], lock,
	tx);
	}
	}
	}
	}


	/* Issue I/O to commit a dirty buffer to disk. */
	static void
	dbuf_write(dbuf_dirty_record_t dr, arc_buf_t data, dmu_tx_t *tx)
	{
	dmu_buf_impl_t *db = dr->dr_dbuf;
	dnode_t *dn = dr->dr_dnode;
	objset_t *os;
	dmu_buf_impl_t *parent = db->db_parent;
	uint64_t txg = tx->tx_txg;
	zbookmark_phys_t zb;
	zio_prop_t zp;
	zio_t pio; / parent I/O */
	int wp_flag = 0;

	ASSERT(dmu_tx_is_syncing(tx));

	os = dn->dn_objset;

	if (db->db_state != DB_NOFILL) {
	if (db->db_level > 0 \|\| dn->dn_type == DMU_OT_DNODE) {
	/*
	* Private object buffers are released here rather
	* than in dbuf_dirty() since they are only modified
	* in the syncing context and we don't want the
	* overhead of making multiple copies of the data.
	*/
	if (BP_IS_HOLE(db->db_blkptr)) {
	arc_buf_thaw(data);
	} else {
	dbuf_release_bp(db);
	}
	dbuf_remap(dn, db, tx);
	}
	}

	if (parent != dn->dn_dbuf) {
	/* Our parent is an indirect block. */
	/* We have a dirty parent that has been scheduled for write. */
	ASSERT(parent && parent->db_data_pending);
	/* Our parent's buffer is one level closer to the dnode. */
	ASSERT(db->db_level == parent->db_level-1);
	/*
	* We're about to modify our parent's db_data by modifying
	* our block pointer, so the parent must be released.
	*/
	ASSERT(arc_released(parent->db_buf));
	pio = parent->db_data_pending->dr_zio;
	} else {
	/* Our parent is the dnode itself. */
	ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 &&
	db->db_blkid != DMU_SPILL_BLKID) \|\|
	(db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0));
	if (db->db_blkid != DMU_SPILL_BLKID)
	ASSERT3P(db->db_blkptr, ==,
	&dn->dn_phys->dn_blkptr[db->db_blkid]);
	pio = dn->dn_zio;
	}

	ASSERT(db->db_level == 0 \|\| data == db->db_buf);
	ASSERT3U(db->db_blkptr->blk_birth, <=, txg);
	ASSERT(pio);

	SET_BOOKMARK(&zb, os->os_dsl_dataset ?
	os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
	db->db.db_object, db->db_level, db->db_blkid);

	if (db->db_blkid == DMU_SPILL_BLKID)
	wp_flag = WP_SPILL;
	wp_flag \|= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0;

	dmu_write_policy(os, dn, db->db_level, wp_flag, &zp);

	/*
	* We copy the blkptr now (rather than when we instantiate the dirty
	* record), because its value can change between open context and
	* syncing context. We do not need to hold dn_struct_rwlock to read
	* db_blkptr because we are in syncing context.
	*/
	dr->dr_bp_copy = *db->db_blkptr;

	if (db->db_level == 0 &&
	dr->dt.dl.dr_override_state == DR_OVERRIDDEN) {
	/*
	* The BP for this block has been provided by open context
	* (by dmu_sync() or dmu_buf_write_embedded()).
	*/
	abd_t *contents = (data != NULL) ?
	abd_get_from_buf(data->b_data, arc_buf_size(data)) : NULL;

	dr->dr_zio = zio_write(pio, os->os_spa, txg, &dr->dr_bp_copy,
	contents, db->db.db_size, db->db.db_size, &zp,
	dbuf_write_override_ready, NULL, NULL,
	dbuf_write_override_done,
	dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
	mutex_enter(&db->db_mtx);
	dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
	zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by,
	dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite);
	mutex_exit(&db->db_mtx);
	} else if (db->db_state == DB_NOFILL) {
	ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF \|\|
	zp.zp_checksum == ZIO_CHECKSUM_NOPARITY);
	dr->dr_zio = zio_write(pio, os->os_spa, txg,
	&dr->dr_bp_copy, NULL, db->db.db_size, db->db.db_size, &zp,
	dbuf_write_nofill_ready, NULL, NULL,
	dbuf_write_nofill_done, db,
	ZIO_PRIORITY_ASYNC_WRITE,
	ZIO_FLAG_MUSTSUCCEED \| ZIO_FLAG_NODATA, &zb);
	} else {
	ASSERT(arc_released(data));

	/*
	* For indirect blocks, we want to setup the children
	* ready callback so that we can properly handle an indirect
	* block that only contains holes.
	*/
	arc_write_done_func_t *children_ready_cb = NULL;
	if (db->db_level != 0)
	children_ready_cb = dbuf_write_children_ready;

	dr->dr_zio = arc_write(pio, os->os_spa, txg,
	&dr->dr_bp_copy, data, DBUF_IS_L2CACHEABLE(db),
	&zp, dbuf_write_ready,
	children_ready_cb, dbuf_write_physdone,
	dbuf_write_done, db, ZIO_PRIORITY_ASYNC_WRITE,
	ZIO_FLAG_MUSTSUCCEED, &zb);
	}
	}

	EXPORT_SYMBOL(dbuf_find);
	EXPORT_SYMBOL(dbuf_is_metadata);
	EXPORT_SYMBOL(dbuf_destroy);
	EXPORT_SYMBOL(dbuf_loan_arcbuf);
	EXPORT_SYMBOL(dbuf_whichblock);
	EXPORT_SYMBOL(dbuf_read);
	EXPORT_SYMBOL(dbuf_unoverride);
	EXPORT_SYMBOL(dbuf_free_range);
	EXPORT_SYMBOL(dbuf_new_size);
	EXPORT_SYMBOL(dbuf_release_bp);
	EXPORT_SYMBOL(dbuf_dirty);
	EXPORT_SYMBOL(dmu_buf_set_crypt_params);
	EXPORT_SYMBOL(dmu_buf_will_dirty);
	EXPORT_SYMBOL(dmu_buf_is_dirty);
	EXPORT_SYMBOL(dmu_buf_will_not_fill);
	EXPORT_SYMBOL(dmu_buf_will_fill);
	EXPORT_SYMBOL(dmu_buf_fill_done);
	EXPORT_SYMBOL(dmu_buf_rele);
	EXPORT_SYMBOL(dbuf_assign_arcbuf);
	EXPORT_SYMBOL(dbuf_prefetch);
	EXPORT_SYMBOL(dbuf_hold_impl);
	EXPORT_SYMBOL(dbuf_hold);
	EXPORT_SYMBOL(dbuf_hold_level);
	EXPORT_SYMBOL(dbuf_create_bonus);
	EXPORT_SYMBOL(dbuf_spill_set_blksz);
	EXPORT_SYMBOL(dbuf_rm_spill);
	EXPORT_SYMBOL(dbuf_add_ref);
	EXPORT_SYMBOL(dbuf_rele);
	EXPORT_SYMBOL(dbuf_rele_and_unlock);
	EXPORT_SYMBOL(dbuf_refcount);
	EXPORT_SYMBOL(dbuf_sync_list);
	EXPORT_SYMBOL(dmu_buf_set_user);
	EXPORT_SYMBOL(dmu_buf_set_user_ie);
	EXPORT_SYMBOL(dmu_buf_get_user);
	EXPORT_SYMBOL(dmu_buf_get_blkptr);

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_dbuf_cache, dbuf_cache_, max_bytes, ULONG, ZMOD_RW,
	"Maximum size in bytes of the dbuf cache.");

	ZFS_MODULE_PARAM(zfs_dbuf_cache, dbuf_cache_, hiwater_pct, UINT, ZMOD_RW,
	"Percentage over dbuf_cache_max_bytes when dbufs must be evicted "
	"directly.");

	ZFS_MODULE_PARAM(zfs_dbuf_cache, dbuf_cache_, lowater_pct, UINT, ZMOD_RW,
	"Percentage below dbuf_cache_max_bytes when the evict thread stops "
	"evicting dbufs.");

	ZFS_MODULE_PARAM(zfs_dbuf, dbuf_, metadata_cache_max_bytes, ULONG, ZMOD_RW,
	"Maximum size in bytes of the dbuf metadata cache.");

	ZFS_MODULE_PARAM(zfs_dbuf, dbuf_, cache_shift, INT, ZMOD_RW,
	"Set the size of the dbuf cache to a log2 fraction of arc size.");

	ZFS_MODULE_PARAM(zfs_dbuf, dbuf_, metadata_cache_shift, INT, ZMOD_RW,
	"Set the size of the dbuf metadata cache to a log2 fraction of arc "
	"size.");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/ddt.c b/sys/contrib/openzfs/module/zfs/ddt.c
	index b94a9f54ece3..35c0f2da9a89 100644
	--- a/sys/contrib/openzfs/module/zfs/ddt.c
	+++ b/sys/contrib/openzfs/module/zfs/ddt.c
	@@ -1,1187 +1,1187 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/zio.h>
	#include <sys/ddt.h>
	#include <sys/zap.h>
	#include <sys/dmu_tx.h>
	#include <sys/arc.h>
	#include <sys/dsl_pool.h>
	#include <sys/zio_checksum.h>
	#include <sys/zio_compress.h>
	#include <sys/dsl_scan.h>
	#include <sys/abd.h>

	static kmem_cache_t *ddt_cache;
	static kmem_cache_t *ddt_entry_cache;

	/*
	* Enable/disable prefetching of dedup-ed blocks which are going to be freed.
	*/
	int zfs_dedup_prefetch = 0;

	static const ddt_ops_t *ddt_ops[DDT_TYPES] = {
	&ddt_zap_ops,
	};

	static const char *ddt_class_name[DDT_CLASSES] = {
	"ditto",
	"duplicate",
	"unique",
	};

	static void
	ddt_object_create(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	dmu_tx_t *tx)
	{
	spa_t *spa = ddt->ddt_spa;
	objset_t *os = ddt->ddt_os;
	uint64_t *objectp = &ddt->ddt_object[type][class];
	boolean_t prehash = zio_checksum_table[ddt->ddt_checksum].ci_flags &
	ZCHECKSUM_FLAG_DEDUP;
	char name[DDT_NAMELEN];

	ddt_object_name(ddt, type, class, name);

	ASSERT(*objectp == 0);
	VERIFY(ddt_ops[type]->ddt_op_create(os, objectp, tx, prehash) == 0);
	ASSERT(*objectp != 0);

	VERIFY(zap_add(os, DMU_POOL_DIRECTORY_OBJECT, name,
	sizeof (uint64_t), 1, objectp, tx) == 0);

	VERIFY(zap_add(os, spa->spa_ddt_stat_object, name,
	sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
	&ddt->ddt_histogram[type][class], tx) == 0);
	}

	static void
	ddt_object_destroy(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	dmu_tx_t *tx)
	{
	spa_t *spa = ddt->ddt_spa;
	objset_t *os = ddt->ddt_os;
	uint64_t *objectp = &ddt->ddt_object[type][class];
	uint64_t count;
	char name[DDT_NAMELEN];

	ddt_object_name(ddt, type, class, name);

	ASSERT(*objectp != 0);
	ASSERT(ddt_histogram_empty(&ddt->ddt_histogram[type][class]));
	VERIFY(ddt_object_count(ddt, type, class, &count) == 0 && count == 0);
	VERIFY(zap_remove(os, DMU_POOL_DIRECTORY_OBJECT, name, tx) == 0);
	VERIFY(zap_remove(os, spa->spa_ddt_stat_object, name, tx) == 0);
	VERIFY(ddt_ops[type]->ddt_op_destroy(os, *objectp, tx) == 0);
	bzero(&ddt->ddt_object_stats[type][class], sizeof (ddt_object_t));

	*objectp = 0;
	}

	static int
	ddt_object_load(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
	{
	ddt_object_t *ddo = &ddt->ddt_object_stats[type][class];
	dmu_object_info_t doi;
	uint64_t count;
	char name[DDT_NAMELEN];
	int error;

	ddt_object_name(ddt, type, class, name);

	error = zap_lookup(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT, name,
	sizeof (uint64_t), 1, &ddt->ddt_object[type][class]);
	if (error != 0)
	return (error);

	error = zap_lookup(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name,
	sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
	&ddt->ddt_histogram[type][class]);
	if (error != 0)
	return (error);

	/*
	* Seed the cached statistics.
	*/
	error = ddt_object_info(ddt, type, class, &doi);
	if (error)
	return (error);

	error = ddt_object_count(ddt, type, class, &count);
	if (error)
	return (error);

	ddo->ddo_count = count;
	ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9;
	ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size;

	return (0);
	}

	static void
	ddt_object_sync(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	dmu_tx_t *tx)
	{
	ddt_object_t *ddo = &ddt->ddt_object_stats[type][class];
	dmu_object_info_t doi;
	uint64_t count;
	char name[DDT_NAMELEN];

	ddt_object_name(ddt, type, class, name);

	VERIFY(zap_update(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name,
	sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
	&ddt->ddt_histogram[type][class], tx) == 0);

	/*
	* Cache DDT statistics; this is the only time they'll change.
	*/
	VERIFY(ddt_object_info(ddt, type, class, &doi) == 0);
	VERIFY(ddt_object_count(ddt, type, class, &count) == 0);

	ddo->ddo_count = count;
	ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9;
	ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size;
	}

	static int
	ddt_object_lookup(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	ddt_entry_t *dde)
	{
	if (!ddt_object_exists(ddt, type, class))
	return (SET_ERROR(ENOENT));

	return (ddt_ops[type]->ddt_op_lookup(ddt->ddt_os,
	ddt->ddt_object[type][class], dde));
	}

	static void
	ddt_object_prefetch(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	ddt_entry_t *dde)
	{
	if (!ddt_object_exists(ddt, type, class))
	return;

	ddt_ops[type]->ddt_op_prefetch(ddt->ddt_os,
	ddt->ddt_object[type][class], dde);
	}

	int
	ddt_object_update(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	ddt_entry_t dde, dmu_tx_t tx)
	{
	ASSERT(ddt_object_exists(ddt, type, class));

	return (ddt_ops[type]->ddt_op_update(ddt->ddt_os,
	ddt->ddt_object[type][class], dde, tx));
	}

	static int
	ddt_object_remove(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	ddt_entry_t dde, dmu_tx_t tx)
	{
	ASSERT(ddt_object_exists(ddt, type, class));

	return (ddt_ops[type]->ddt_op_remove(ddt->ddt_os,
	ddt->ddt_object[type][class], dde, tx));
	}

	int
	ddt_object_walk(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	uint64_t walk, ddt_entry_t dde)
	{
	ASSERT(ddt_object_exists(ddt, type, class));

	return (ddt_ops[type]->ddt_op_walk(ddt->ddt_os,
	ddt->ddt_object[type][class], dde, walk));
	}

	int
	ddt_object_count(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	uint64_t *count)
	{
	ASSERT(ddt_object_exists(ddt, type, class));

	return (ddt_ops[type]->ddt_op_count(ddt->ddt_os,
	ddt->ddt_object[type][class], count));
	}

	int
	ddt_object_info(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	dmu_object_info_t *doi)
	{
	if (!ddt_object_exists(ddt, type, class))
	return (SET_ERROR(ENOENT));

	return (dmu_object_info(ddt->ddt_os, ddt->ddt_object[type][class],
	doi));
	}

	boolean_t
	ddt_object_exists(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
	{
	return (!!ddt->ddt_object[type][class]);
	}

	void
	ddt_object_name(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
	char *name)
	{
	(void) snprintf(name, DDT_NAMELEN, DMU_POOL_DDT,
	zio_checksum_table[ddt->ddt_checksum].ci_name,
	ddt_ops[type]->ddt_op_name, ddt_class_name[class]);
	}

	void
	ddt_bp_fill(const ddt_phys_t ddp, blkptr_t bp, uint64_t txg)
	{
	ASSERT(txg != 0);

	for (int d = 0; d < SPA_DVAS_PER_BP; d++)
	bp->blk_dva[d] = ddp->ddp_dva[d];
	BP_SET_BIRTH(bp, txg, ddp->ddp_phys_birth);
	}

	/*
	* The bp created via this function may be used for repairs and scrub, but it
	* will be missing the salt / IV required to do a full decrypting read.
	*/
	void
	ddt_bp_create(enum zio_checksum checksum,
	const ddt_key_t ddk, const ddt_phys_t ddp, blkptr_t *bp)
	{
	BP_ZERO(bp);

	if (ddp != NULL)
	ddt_bp_fill(ddp, bp, ddp->ddp_phys_birth);

	bp->blk_cksum = ddk->ddk_cksum;

	BP_SET_LSIZE(bp, DDK_GET_LSIZE(ddk));
	BP_SET_PSIZE(bp, DDK_GET_PSIZE(ddk));
	BP_SET_COMPRESS(bp, DDK_GET_COMPRESS(ddk));
	BP_SET_CRYPT(bp, DDK_GET_CRYPT(ddk));
	BP_SET_FILL(bp, 1);
	BP_SET_CHECKSUM(bp, checksum);
	BP_SET_TYPE(bp, DMU_OT_DEDUP);
	BP_SET_LEVEL(bp, 0);
	BP_SET_DEDUP(bp, 1);
	BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);
	}

	void
	ddt_key_fill(ddt_key_t ddk, const blkptr_t bp)
	{
	ddk->ddk_cksum = bp->blk_cksum;
	ddk->ddk_prop = 0;

	ASSERT(BP_IS_ENCRYPTED(bp) \|\| !BP_USES_CRYPT(bp));

	DDK_SET_LSIZE(ddk, BP_GET_LSIZE(bp));
	DDK_SET_PSIZE(ddk, BP_GET_PSIZE(bp));
	DDK_SET_COMPRESS(ddk, BP_GET_COMPRESS(bp));
	DDK_SET_CRYPT(ddk, BP_USES_CRYPT(bp));
	}

	void
	ddt_phys_fill(ddt_phys_t ddp, const blkptr_t bp)
	{
	ASSERT(ddp->ddp_phys_birth == 0);

	for (int d = 0; d < SPA_DVAS_PER_BP; d++)
	ddp->ddp_dva[d] = bp->blk_dva[d];
	ddp->ddp_phys_birth = BP_PHYSICAL_BIRTH(bp);
	}

	void
	ddt_phys_clear(ddt_phys_t *ddp)
	{
	bzero(ddp, sizeof (*ddp));
	}

	void
	ddt_phys_addref(ddt_phys_t *ddp)
	{
	ddp->ddp_refcnt++;
	}

	void
	ddt_phys_decref(ddt_phys_t *ddp)
	{
	if (ddp) {
	ASSERT(ddp->ddp_refcnt > 0);
	ddp->ddp_refcnt--;
	}
	}

	void
	ddt_phys_free(ddt_t ddt, ddt_key_t ddk, ddt_phys_t *ddp, uint64_t txg)
	{
	blkptr_t blk;

	ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);

	/*
	* We clear the dedup bit so that zio_free() will actually free the
	* space, rather than just decrementing the refcount in the DDT.
	*/
	BP_SET_DEDUP(&blk, 0);

	ddt_phys_clear(ddp);
	zio_free(ddt->ddt_spa, txg, &blk);
	}

	ddt_phys_t *
	ddt_phys_select(const ddt_entry_t dde, const blkptr_t bp)
	{
	ddt_phys_t ddp = (ddt_phys_t )dde->dde_phys;

	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
	if (DVA_EQUAL(BP_IDENTITY(bp), &ddp->ddp_dva[0]) &&
	BP_PHYSICAL_BIRTH(bp) == ddp->ddp_phys_birth)
	return (ddp);
	}
	return (NULL);
	}

	uint64_t
	ddt_phys_total_refcnt(const ddt_entry_t *dde)
	{
	uint64_t refcnt = 0;

	for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++)
	refcnt += dde->dde_phys[p].ddp_refcnt;

	return (refcnt);
	}

	static void
	ddt_stat_generate(ddt_t ddt, ddt_entry_t dde, ddt_stat_t *dds)
	{
	spa_t *spa = ddt->ddt_spa;
	ddt_phys_t *ddp = dde->dde_phys;
	ddt_key_t *ddk = &dde->dde_key;
	uint64_t lsize = DDK_GET_LSIZE(ddk);
	uint64_t psize = DDK_GET_PSIZE(ddk);

	bzero(dds, sizeof (*dds));

	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
	uint64_t dsize = 0;
	uint64_t refcnt = ddp->ddp_refcnt;

	if (ddp->ddp_phys_birth == 0)
	continue;

	for (int d = 0; d < DDE_GET_NDVAS(dde); d++)
	dsize += dva_get_dsize_sync(spa, &ddp->ddp_dva[d]);

	dds->dds_blocks += 1;
	dds->dds_lsize += lsize;
	dds->dds_psize += psize;
	dds->dds_dsize += dsize;

	dds->dds_ref_blocks += refcnt;
	dds->dds_ref_lsize += lsize * refcnt;
	dds->dds_ref_psize += psize * refcnt;
	dds->dds_ref_dsize += dsize * refcnt;
	}
	}

	void
	ddt_stat_add(ddt_stat_t dst, const ddt_stat_t src, uint64_t neg)
	{
	const uint64_t s = (const uint64_t )src;
	uint64_t d = (uint64_t )dst;
	uint64_t d_end = (uint64_t )(dst + 1);

	ASSERT(neg == 0 \|\| neg == -1ULL); /* add or subtract */

	while (d < d_end)
	d++ += (s++ ^ neg) - neg;
	}

	static void
	ddt_stat_update(ddt_t ddt, ddt_entry_t dde, uint64_t neg)
	{
	ddt_stat_t dds;
	ddt_histogram_t *ddh;
	int bucket;

	ddt_stat_generate(ddt, dde, &dds);

	bucket = highbit64(dds.dds_ref_blocks) - 1;
	ASSERT(bucket >= 0);

	ddh = &ddt->ddt_histogram[dde->dde_type][dde->dde_class];

	ddt_stat_add(&ddh->ddh_stat[bucket], &dds, neg);
	}

	void
	ddt_histogram_add(ddt_histogram_t dst, const ddt_histogram_t src)
	{
	for (int h = 0; h < 64; h++)
	ddt_stat_add(&dst->ddh_stat[h], &src->ddh_stat[h], 0);
	}

	void
	ddt_histogram_stat(ddt_stat_t dds, const ddt_histogram_t ddh)
	{
	bzero(dds, sizeof (*dds));

	for (int h = 0; h < 64; h++)
	ddt_stat_add(dds, &ddh->ddh_stat[h], 0);
	}

	boolean_t
	ddt_histogram_empty(const ddt_histogram_t *ddh)
	{
	const uint64_t s = (const uint64_t )ddh;
	const uint64_t s_end = (const uint64_t )(ddh + 1);

	while (s < s_end)
	if (*s++ != 0)
	return (B_FALSE);

	return (B_TRUE);
	}

	void
	ddt_get_dedup_object_stats(spa_t spa, ddt_object_t ddo_total)
	{
	/* Sum the statistics we cached in ddt_object_sync(). */
	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
	ddt_t *ddt = spa->spa_ddt[c];
	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
	for (enum ddt_class class = 0; class < DDT_CLASSES;
	class++) {
	ddt_object_t *ddo =
	&ddt->ddt_object_stats[type][class];
	ddo_total->ddo_count += ddo->ddo_count;
	ddo_total->ddo_dspace += ddo->ddo_dspace;
	ddo_total->ddo_mspace += ddo->ddo_mspace;
	}
	}
	}

	/* ... and compute the averages. */
	if (ddo_total->ddo_count != 0) {
	ddo_total->ddo_dspace /= ddo_total->ddo_count;
	ddo_total->ddo_mspace /= ddo_total->ddo_count;
	}
	}

	void
	ddt_get_dedup_histogram(spa_t spa, ddt_histogram_t ddh)
	{
	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
	ddt_t *ddt = spa->spa_ddt[c];
	- for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
	+ for (enum ddt_type type = 0; type < DDT_TYPES && ddt; type++) {
	for (enum ddt_class class = 0; class < DDT_CLASSES;
	class++) {
	ddt_histogram_add(ddh,
	&ddt->ddt_histogram_cache[type][class]);
	}
	}
	}
	}

	void
	ddt_get_dedup_stats(spa_t spa, ddt_stat_t dds_total)
	{
	ddt_histogram_t *ddh_total;

	ddh_total = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP);
	ddt_get_dedup_histogram(spa, ddh_total);
	ddt_histogram_stat(dds_total, ddh_total);
	kmem_free(ddh_total, sizeof (ddt_histogram_t));
	}

	uint64_t
	ddt_get_dedup_dspace(spa_t *spa)
	{
	ddt_stat_t dds_total;

	if (spa->spa_dedup_dspace != ~0ULL)
	return (spa->spa_dedup_dspace);

	bzero(&dds_total, sizeof (ddt_stat_t));

	/* Calculate and cache the stats */
	ddt_get_dedup_stats(spa, &dds_total);
	spa->spa_dedup_dspace = dds_total.dds_ref_dsize - dds_total.dds_dsize;
	return (spa->spa_dedup_dspace);
	}

	uint64_t
	ddt_get_pool_dedup_ratio(spa_t *spa)
	{
	ddt_stat_t dds_total = { 0 };

	ddt_get_dedup_stats(spa, &dds_total);
	if (dds_total.dds_dsize == 0)
	return (100);

	return (dds_total.dds_ref_dsize * 100 / dds_total.dds_dsize);
	}

	size_t
	ddt_compress(void src, uchar_t dst, size_t s_len, size_t d_len)
	{
	uchar_t *version = dst++;
	int cpfunc = ZIO_COMPRESS_ZLE;
	zio_compress_info_t *ci = &zio_compress_table[cpfunc];
	size_t c_len;

	ASSERT(d_len >= s_len + 1); /* no compression plus version byte */

	c_len = ci->ci_compress(src, dst, s_len, d_len - 1, ci->ci_level);

	if (c_len == s_len) {
	cpfunc = ZIO_COMPRESS_OFF;
	bcopy(src, dst, s_len);
	}

	*version = cpfunc;
	/* CONSTCOND */
	if (ZFS_HOST_BYTEORDER)
	*version \|= DDT_COMPRESS_BYTEORDER_MASK;

	return (c_len + 1);
	}

	void
	ddt_decompress(uchar_t src, void dst, size_t s_len, size_t d_len)
	{
	uchar_t version = *src++;
	int cpfunc = version & DDT_COMPRESS_FUNCTION_MASK;
	zio_compress_info_t *ci = &zio_compress_table[cpfunc];

	if (ci->ci_decompress != NULL)
	(void) ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level);
	else
	bcopy(src, dst, d_len);

	if (((version & DDT_COMPRESS_BYTEORDER_MASK) != 0) !=
	(ZFS_HOST_BYTEORDER != 0))
	byteswap_uint64_array(dst, d_len);
	}

	ddt_t *
	ddt_select(spa_t spa, const blkptr_t bp)
	{
	return (spa->spa_ddt[BP_GET_CHECKSUM(bp)]);
	}

	void
	ddt_enter(ddt_t *ddt)
	{
	mutex_enter(&ddt->ddt_lock);
	}

	void
	ddt_exit(ddt_t *ddt)
	{
	mutex_exit(&ddt->ddt_lock);
	}

	void
	ddt_init(void)
	{
	ddt_cache = kmem_cache_create("ddt_cache",
	sizeof (ddt_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
	ddt_entry_cache = kmem_cache_create("ddt_entry_cache",
	sizeof (ddt_entry_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
	}

	void
	ddt_fini(void)
	{
	kmem_cache_destroy(ddt_entry_cache);
	kmem_cache_destroy(ddt_cache);
	}

	static ddt_entry_t *
	ddt_alloc(const ddt_key_t *ddk)
	{
	ddt_entry_t *dde;

	dde = kmem_cache_alloc(ddt_entry_cache, KM_SLEEP);
	bzero(dde, sizeof (ddt_entry_t));
	cv_init(&dde->dde_cv, NULL, CV_DEFAULT, NULL);

	dde->dde_key = *ddk;

	return (dde);
	}

	static void
	ddt_free(ddt_entry_t *dde)
	{
	ASSERT(!dde->dde_loading);

	for (int p = 0; p < DDT_PHYS_TYPES; p++)
	ASSERT(dde->dde_lead_zio[p] == NULL);

	if (dde->dde_repair_abd != NULL)
	abd_free(dde->dde_repair_abd);

	cv_destroy(&dde->dde_cv);
	kmem_cache_free(ddt_entry_cache, dde);
	}

	void
	ddt_remove(ddt_t ddt, ddt_entry_t dde)
	{
	ASSERT(MUTEX_HELD(&ddt->ddt_lock));

	avl_remove(&ddt->ddt_tree, dde);
	ddt_free(dde);
	}

	ddt_entry_t *
	ddt_lookup(ddt_t ddt, const blkptr_t bp, boolean_t add)
	{
	ddt_entry_t *dde, dde_search;
	enum ddt_type type;
	enum ddt_class class;
	avl_index_t where;
	int error;

	ASSERT(MUTEX_HELD(&ddt->ddt_lock));

	ddt_key_fill(&dde_search.dde_key, bp);

	dde = avl_find(&ddt->ddt_tree, &dde_search, &where);
	if (dde == NULL) {
	if (!add)
	return (NULL);
	dde = ddt_alloc(&dde_search.dde_key);
	avl_insert(&ddt->ddt_tree, dde, where);
	}

	while (dde->dde_loading)
	cv_wait(&dde->dde_cv, &ddt->ddt_lock);

	if (dde->dde_loaded)
	return (dde);

	dde->dde_loading = B_TRUE;

	ddt_exit(ddt);

	error = ENOENT;

	for (type = 0; type < DDT_TYPES; type++) {
	for (class = 0; class < DDT_CLASSES; class++) {
	error = ddt_object_lookup(ddt, type, class, dde);
	if (error != ENOENT) {
	ASSERT0(error);
	break;
	}
	}
	if (error != ENOENT)
	break;
	}

	ddt_enter(ddt);

	ASSERT(dde->dde_loaded == B_FALSE);
	ASSERT(dde->dde_loading == B_TRUE);

	dde->dde_type = type; /* will be DDT_TYPES if no entry found */
	dde->dde_class = class; /* will be DDT_CLASSES if no entry found */
	dde->dde_loaded = B_TRUE;
	dde->dde_loading = B_FALSE;

	if (error == 0)
	ddt_stat_update(ddt, dde, -1ULL);

	cv_broadcast(&dde->dde_cv);

	return (dde);
	}

	void
	ddt_prefetch(spa_t spa, const blkptr_t bp)
	{
	ddt_t *ddt;
	ddt_entry_t dde;

	if (!zfs_dedup_prefetch \|\| bp == NULL \|\| !BP_GET_DEDUP(bp))
	return;

	/*
	* We only remove the DDT once all tables are empty and only
	* prefetch dedup blocks when there are entries in the DDT.
	* Thus no locking is required as the DDT can't disappear on us.
	*/
	ddt = ddt_select(spa, bp);
	ddt_key_fill(&dde.dde_key, bp);

	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
	for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
	ddt_object_prefetch(ddt, type, class, &dde);
	}
	}
	}

	/*
	* Opaque struct used for ddt_key comparison
	*/
	#define DDT_KEY_CMP_LEN (sizeof (ddt_key_t) / sizeof (uint16_t))

	typedef struct ddt_key_cmp {
	uint16_t u16[DDT_KEY_CMP_LEN];
	} ddt_key_cmp_t;

	int
	ddt_entry_compare(const void x1, const void x2)
	{
	const ddt_entry_t *dde1 = x1;
	const ddt_entry_t *dde2 = x2;
	const ddt_key_cmp_t k1 = (const ddt_key_cmp_t )&dde1->dde_key;
	const ddt_key_cmp_t k2 = (const ddt_key_cmp_t )&dde2->dde_key;
	int32_t cmp = 0;

	for (int i = 0; i < DDT_KEY_CMP_LEN; i++) {
	cmp = (int32_t)k1->u16[i] - (int32_t)k2->u16[i];
	if (likely(cmp))
	break;
	}

	return (TREE_ISIGN(cmp));
	}

	static ddt_t *
	ddt_table_alloc(spa_t *spa, enum zio_checksum c)
	{
	ddt_t *ddt;

	ddt = kmem_cache_alloc(ddt_cache, KM_SLEEP);
	bzero(ddt, sizeof (ddt_t));

	mutex_init(&ddt->ddt_lock, NULL, MUTEX_DEFAULT, NULL);
	avl_create(&ddt->ddt_tree, ddt_entry_compare,
	sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node));
	avl_create(&ddt->ddt_repair_tree, ddt_entry_compare,
	sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node));
	ddt->ddt_checksum = c;
	ddt->ddt_spa = spa;
	ddt->ddt_os = spa->spa_meta_objset;

	return (ddt);
	}

	static void
	ddt_table_free(ddt_t *ddt)
	{
	ASSERT(avl_numnodes(&ddt->ddt_tree) == 0);
	ASSERT(avl_numnodes(&ddt->ddt_repair_tree) == 0);
	avl_destroy(&ddt->ddt_tree);
	avl_destroy(&ddt->ddt_repair_tree);
	mutex_destroy(&ddt->ddt_lock);
	kmem_cache_free(ddt_cache, ddt);
	}

	void
	ddt_create(spa_t *spa)
	{
	spa->spa_dedup_checksum = ZIO_DEDUPCHECKSUM;

	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++)
	spa->spa_ddt[c] = ddt_table_alloc(spa, c);
	}

	int
	ddt_load(spa_t *spa)
	{
	int error;

	ddt_create(spa);

	error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_DDT_STATS, sizeof (uint64_t), 1,
	&spa->spa_ddt_stat_object);

	if (error)
	return (error == ENOENT ? 0 : error);

	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
	ddt_t *ddt = spa->spa_ddt[c];
	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
	for (enum ddt_class class = 0; class < DDT_CLASSES;
	class++) {
	error = ddt_object_load(ddt, type, class);
	if (error != 0 && error != ENOENT)
	return (error);
	}
	}

	/*
	* Seed the cached histograms.
	*/
	bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache,
	sizeof (ddt->ddt_histogram));
	spa->spa_dedup_dspace = ~0ULL;
	}

	return (0);
	}

	void
	ddt_unload(spa_t *spa)
	{
	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
	if (spa->spa_ddt[c]) {
	ddt_table_free(spa->spa_ddt[c]);
	spa->spa_ddt[c] = NULL;
	}
	}
	}

	boolean_t
	ddt_class_contains(spa_t spa, enum ddt_class max_class, const blkptr_t bp)
	{
	ddt_t *ddt;
	ddt_entry_t *dde;

	if (!BP_GET_DEDUP(bp))
	return (B_FALSE);

	if (max_class == DDT_CLASS_UNIQUE)
	return (B_TRUE);

	ddt = spa->spa_ddt[BP_GET_CHECKSUM(bp)];
	dde = kmem_cache_alloc(ddt_entry_cache, KM_SLEEP);

	ddt_key_fill(&(dde->dde_key), bp);

	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
	for (enum ddt_class class = 0; class <= max_class; class++) {
	if (ddt_object_lookup(ddt, type, class, dde) == 0) {
	kmem_cache_free(ddt_entry_cache, dde);
	return (B_TRUE);
	}
	}
	}

	kmem_cache_free(ddt_entry_cache, dde);
	return (B_FALSE);
	}

	ddt_entry_t *
	ddt_repair_start(ddt_t ddt, const blkptr_t bp)
	{
	ddt_key_t ddk;
	ddt_entry_t *dde;

	ddt_key_fill(&ddk, bp);

	dde = ddt_alloc(&ddk);

	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
	for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
	/*
	* We can only do repair if there are multiple copies
	* of the block. For anything in the UNIQUE class,
	* there's definitely only one copy, so don't even try.
	*/
	if (class != DDT_CLASS_UNIQUE &&
	ddt_object_lookup(ddt, type, class, dde) == 0)
	return (dde);
	}
	}

	bzero(dde->dde_phys, sizeof (dde->dde_phys));

	return (dde);
	}

	void
	ddt_repair_done(ddt_t ddt, ddt_entry_t dde)
	{
	avl_index_t where;

	ddt_enter(ddt);

	if (dde->dde_repair_abd != NULL && spa_writeable(ddt->ddt_spa) &&
	avl_find(&ddt->ddt_repair_tree, dde, &where) == NULL)
	avl_insert(&ddt->ddt_repair_tree, dde, where);
	else
	ddt_free(dde);

	ddt_exit(ddt);
	}

	static void
	ddt_repair_entry_done(zio_t *zio)
	{
	ddt_entry_t *rdde = zio->io_private;

	ddt_free(rdde);
	}

	static void
	ddt_repair_entry(ddt_t ddt, ddt_entry_t dde, ddt_entry_t rdde, zio_t rio)
	{
	ddt_phys_t *ddp = dde->dde_phys;
	ddt_phys_t *rddp = rdde->dde_phys;
	ddt_key_t *ddk = &dde->dde_key;
	ddt_key_t *rddk = &rdde->dde_key;
	zio_t *zio;
	blkptr_t blk;

	zio = zio_null(rio, rio->io_spa, NULL,
	ddt_repair_entry_done, rdde, rio->io_flags);

	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++, rddp++) {
	if (ddp->ddp_phys_birth == 0 \|\|
	ddp->ddp_phys_birth != rddp->ddp_phys_birth \|\|
	bcmp(ddp->ddp_dva, rddp->ddp_dva, sizeof (ddp->ddp_dva)))
	continue;
	ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
	zio_nowait(zio_rewrite(zio, zio->io_spa, 0, &blk,
	rdde->dde_repair_abd, DDK_GET_PSIZE(rddk), NULL, NULL,
	ZIO_PRIORITY_SYNC_WRITE, ZIO_DDT_CHILD_FLAGS(zio), NULL));
	}

	zio_nowait(zio);
	}

	static void
	ddt_repair_table(ddt_t ddt, zio_t rio)
	{
	spa_t *spa = ddt->ddt_spa;
	ddt_entry_t dde, rdde_next, *rdde;
	avl_tree_t *t = &ddt->ddt_repair_tree;
	blkptr_t blk;

	if (spa_sync_pass(spa) > 1)
	return;

	ddt_enter(ddt);
	for (rdde = avl_first(t); rdde != NULL; rdde = rdde_next) {
	rdde_next = AVL_NEXT(t, rdde);
	avl_remove(&ddt->ddt_repair_tree, rdde);
	ddt_exit(ddt);
	ddt_bp_create(ddt->ddt_checksum, &rdde->dde_key, NULL, &blk);
	dde = ddt_repair_start(ddt, &blk);
	ddt_repair_entry(ddt, dde, rdde, rio);
	ddt_repair_done(ddt, dde);
	ddt_enter(ddt);
	}
	ddt_exit(ddt);
	}

	static void
	ddt_sync_entry(ddt_t ddt, ddt_entry_t dde, dmu_tx_t *tx, uint64_t txg)
	{
	dsl_pool_t *dp = ddt->ddt_spa->spa_dsl_pool;
	ddt_phys_t *ddp = dde->dde_phys;
	ddt_key_t *ddk = &dde->dde_key;
	enum ddt_type otype = dde->dde_type;
	enum ddt_type ntype = DDT_TYPE_CURRENT;
	enum ddt_class oclass = dde->dde_class;
	enum ddt_class nclass;
	uint64_t total_refcnt = 0;

	ASSERT(dde->dde_loaded);
	ASSERT(!dde->dde_loading);

	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
	ASSERT(dde->dde_lead_zio[p] == NULL);
	if (ddp->ddp_phys_birth == 0) {
	ASSERT(ddp->ddp_refcnt == 0);
	continue;
	}
	if (p == DDT_PHYS_DITTO) {
	/*
	* Note, we no longer create DDT-DITTO blocks, but we
	* don't want to leak any written by older software.
	*/
	ddt_phys_free(ddt, ddk, ddp, txg);
	continue;
	}
	if (ddp->ddp_refcnt == 0)
	ddt_phys_free(ddt, ddk, ddp, txg);
	total_refcnt += ddp->ddp_refcnt;
	}

	/* We do not create new DDT-DITTO blocks. */
	ASSERT0(dde->dde_phys[DDT_PHYS_DITTO].ddp_phys_birth);
	if (total_refcnt > 1)
	nclass = DDT_CLASS_DUPLICATE;
	else
	nclass = DDT_CLASS_UNIQUE;

	if (otype != DDT_TYPES &&
	(otype != ntype \|\| oclass != nclass \|\| total_refcnt == 0)) {
	VERIFY(ddt_object_remove(ddt, otype, oclass, dde, tx) == 0);
	ASSERT(ddt_object_lookup(ddt, otype, oclass, dde) == ENOENT);
	}

	if (total_refcnt != 0) {
	dde->dde_type = ntype;
	dde->dde_class = nclass;
	ddt_stat_update(ddt, dde, 0);
	if (!ddt_object_exists(ddt, ntype, nclass))
	ddt_object_create(ddt, ntype, nclass, tx);
	VERIFY(ddt_object_update(ddt, ntype, nclass, dde, tx) == 0);

	/*
	* If the class changes, the order that we scan this bp
	* changes. If it decreases, we could miss it, so
	* scan it right now. (This covers both class changing
	* while we are doing ddt_walk(), and when we are
	* traversing.)
	*/
	if (nclass < oclass) {
	dsl_scan_ddt_entry(dp->dp_scan,
	ddt->ddt_checksum, dde, tx);
	}
	}
	}

	static void
	ddt_sync_table(ddt_t ddt, dmu_tx_t tx, uint64_t txg)
	{
	spa_t *spa = ddt->ddt_spa;
	ddt_entry_t *dde;
	void *cookie = NULL;

	if (avl_numnodes(&ddt->ddt_tree) == 0)
	return;

	ASSERT(spa->spa_uberblock.ub_version >= SPA_VERSION_DEDUP);

	if (spa->spa_ddt_stat_object == 0) {
	spa->spa_ddt_stat_object = zap_create_link(ddt->ddt_os,
	DMU_OT_DDT_STATS, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_DDT_STATS, tx);
	}

	while ((dde = avl_destroy_nodes(&ddt->ddt_tree, &cookie)) != NULL) {
	ddt_sync_entry(ddt, dde, tx, txg);
	ddt_free(dde);
	}

	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
	uint64_t add, count = 0;
	for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
	if (ddt_object_exists(ddt, type, class)) {
	ddt_object_sync(ddt, type, class, tx);
	VERIFY(ddt_object_count(ddt, type, class,
	&add) == 0);
	count += add;
	}
	}
	for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
	if (count == 0 && ddt_object_exists(ddt, type, class))
	ddt_object_destroy(ddt, type, class, tx);
	}
	}

	bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache,
	sizeof (ddt->ddt_histogram));
	spa->spa_dedup_dspace = ~0ULL;
	}

	void
	ddt_sync(spa_t *spa, uint64_t txg)
	{
	dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
	dmu_tx_t *tx;
	zio_t *rio;

	ASSERT(spa_syncing_txg(spa) == txg);

	tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);

	rio = zio_root(spa, NULL, NULL,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE \| ZIO_FLAG_SELF_HEAL);

	/*
	* This function may cause an immediate scan of ddt blocks (see
	* the comment above dsl_scan_ddt() for details). We set the
	* scan's root zio here so that we can wait for any scan IOs in
	* addition to the regular ddt IOs.
	*/
	ASSERT3P(scn->scn_zio_root, ==, NULL);
	scn->scn_zio_root = rio;

	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
	ddt_t *ddt = spa->spa_ddt[c];
	if (ddt == NULL)
	continue;
	ddt_sync_table(ddt, tx, txg);
	ddt_repair_table(ddt, rio);
	}

	(void) zio_wait(rio);
	scn->scn_zio_root = NULL;

	dmu_tx_commit(tx);
	}

	int
	ddt_walk(spa_t spa, ddt_bookmark_t ddb, ddt_entry_t *dde)
	{
	do {
	do {
	do {
	ddt_t *ddt = spa->spa_ddt[ddb->ddb_checksum];
	int error = ENOENT;
	if (ddt_object_exists(ddt, ddb->ddb_type,
	ddb->ddb_class)) {
	error = ddt_object_walk(ddt,
	ddb->ddb_type, ddb->ddb_class,
	&ddb->ddb_cursor, dde);
	}
	dde->dde_type = ddb->ddb_type;
	dde->dde_class = ddb->ddb_class;
	if (error == 0)
	return (0);
	if (error != ENOENT)
	return (error);
	ddb->ddb_cursor = 0;
	} while (++ddb->ddb_checksum < ZIO_CHECKSUM_FUNCTIONS);
	ddb->ddb_checksum = 0;
	} while (++ddb->ddb_type < DDT_TYPES);
	ddb->ddb_type = 0;
	} while (++ddb->ddb_class < DDT_CLASSES);

	return (SET_ERROR(ENOENT));
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_dedup, zfs_dedup_, prefetch, INT, ZMOD_RW,
	"Enable prefetching dedup-ed blks");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/dmu_redact.c b/sys/contrib/openzfs/module/zfs/dmu_redact.c
	index 62c7d01d4bd2..fdbdf7d6e868 100644
	--- a/sys/contrib/openzfs/module/zfs/dmu_redact.c
	+++ b/sys/contrib/openzfs/module/zfs/dmu_redact.c
	@@ -1,1199 +1,1201 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2017, 2018 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/txg.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dmu_redact.h>
	#include <sys/bqueue.h>
	#include <sys/objlist.h>
	#include <sys/dmu_tx.h>
	#ifdef _KERNEL
	#include <sys/zfs_vfsops.h>
	#include <sys/zap.h>
	#include <sys/zfs_znode.h>
	#endif

	/*
	* This controls the number of entries in the buffer the redaction_list_update
	* synctask uses to buffer writes to the redaction list.
	*/
	int redact_sync_bufsize = 1024;

	/*
	* Controls how often to update the redaction list when creating a redaction
	* list.
	*/
	uint64_t redaction_list_update_interval_ns = 1000 * 1000 * 1000ULL; /* NS */

	/*
	* This tunable controls the length of the queues that zfs redact worker threads
	* use to communicate. If the dmu_redact_snap thread is blocking on these
	* queues, this variable may need to be increased. If there is a significant
	* slowdown at the start of a redact operation as these threads consume all the
	* available IO resources, or the queues are consuming too much memory, this
	* variable may need to be decreased.
	*/
	int zfs_redact_queue_length = 1024 * 1024;

	/*
	* These tunables control the fill fraction of the queues by zfs redact. The
	* fill fraction controls the frequency with which threads have to be
	* cv_signaled. If a lot of cpu time is being spent on cv_signal, then these
	* should be tuned down. If the queues empty before the signalled thread can
	* catch up, then these should be tuned up.
	*/
	uint64_t zfs_redact_queue_ff = 20;

	struct redact_record {
	bqueue_node_t ln;
	boolean_t eos_marker; /* Marks the end of the stream */
	uint64_t start_object;
	uint64_t start_blkid;
	uint64_t end_object;
	uint64_t end_blkid;
	uint8_t indblkshift;
	uint32_t datablksz;
	};

	struct redact_thread_arg {
	bqueue_t q;
	objset_t os; / Objset to traverse */
	dsl_dataset_t ds; / Dataset to traverse */
	struct redact_record *current_record;
	int error_code;
	boolean_t cancel;
	zbookmark_phys_t resume;
	objlist_t *deleted_objs;
	uint64_t *num_blocks_visited;
	uint64_t ignore_object; /* ignore further callbacks on this */
	uint64_t txg; /* txg to traverse since */
	};

	/*
	* The redaction node is a wrapper around the redaction record that is used
	* by the redaction merging thread to sort the records and determine overlaps.
	*
	* It contains two nodes; one sorts the records by their start_zb, and the other
	* sorts the records by their end_zb.
	*/
	struct redact_node {
	avl_node_t avl_node_start;
	avl_node_t avl_node_end;
	struct redact_record *record;
	struct redact_thread_arg *rt_arg;
	uint32_t thread_num;
	};

	struct merge_data {
	list_t md_redact_block_pending;
	redact_block_phys_t md_coalesce_block;
	uint64_t md_last_time;
	redact_block_phys_t md_furthest[TXG_SIZE];
	/* Lists of struct redact_block_list_node. */
	list_t md_blocks[TXG_SIZE];
	boolean_t md_synctask_txg[TXG_SIZE];
	uint64_t md_latest_synctask_txg;
	redaction_list_t *md_redaction_list;
	};

	/*
	* A wrapper around struct redact_block so it can be stored in a list_t.
	*/
	struct redact_block_list_node {
	redact_block_phys_t block;
	list_node_t node;
	};

	/*
	* We've found a new redaction candidate. In order to improve performance, we
	* coalesce these blocks when they're adjacent to each other. This function
	* handles that. If the new candidate block range is immediately after the
	* range we're building, coalesce it into the range we're building. Otherwise,
	* put the record we're building on the queue, and update the build pointer to
	* point to the new record.
	*/
	static void
	record_merge_enqueue(bqueue_t q, struct redact_record *build,
	struct redact_record *new)
	{
	if (new->eos_marker) {
	if (*build != NULL)
	bqueue_enqueue(q, build, sizeof (build));
	bqueue_enqueue_flush(q, new, sizeof (*new));
	return;
	}
	if (*build == NULL) {
	*build = new;
	return;
	}
	struct redact_record curbuild = build;
	if ((curbuild->end_object == new->start_object &&
	curbuild->end_blkid + 1 == new->start_blkid &&
	curbuild->end_blkid != UINT64_MAX) \|\|
	(curbuild->end_object + 1 == new->start_object &&
	curbuild->end_blkid == UINT64_MAX && new->start_blkid == 0)) {
	curbuild->end_object = new->end_object;
	curbuild->end_blkid = new->end_blkid;
	kmem_free(new, sizeof (*new));
	} else {
	bqueue_enqueue(q, curbuild, sizeof (*curbuild));
	*build = new;
	}
	}
	#ifdef _KERNEL
	struct objnode {
	avl_node_t node;
	uint64_t obj;
	};

	static int
	objnode_compare(const void o1, const void o2)
	{
	const struct objnode *obj1 = o1;
	const struct objnode *obj2 = o2;
	if (obj1->obj < obj2->obj)
	return (-1);
	if (obj1->obj > obj2->obj)
	return (1);
	return (0);
	}


	static objlist_t *
	zfs_get_deleteq(objset_t *os)
	{
	objlist_t *deleteq_objlist = objlist_create();
	uint64_t deleteq_obj;
	zap_cursor_t zc;
	zap_attribute_t za;
	dmu_object_info_t doi;

	ASSERT3U(os->os_phys->os_type, ==, DMU_OST_ZFS);
	VERIFY0(dmu_object_info(os, MASTER_NODE_OBJ, &doi));
	ASSERT3U(doi.doi_type, ==, DMU_OT_MASTER_NODE);

	VERIFY0(zap_lookup(os, MASTER_NODE_OBJ,
	ZFS_UNLINKED_SET, sizeof (uint64_t), 1, &deleteq_obj));

	/*
	* In order to insert objects into the objlist, they must be in sorted
	* order. We don't know what order we'll get them out of the ZAP in, so
	* we insert them into and remove them from an avl_tree_t to sort them.
	*/
	avl_tree_t at;
	avl_create(&at, objnode_compare, sizeof (struct objnode),
	offsetof(struct objnode, node));

	for (zap_cursor_init(&zc, os, deleteq_obj);
	zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) {
	struct objnode obj = kmem_zalloc(sizeof (obj), KM_SLEEP);
	obj->obj = za.za_first_integer;
	avl_add(&at, obj);
	}
	zap_cursor_fini(&zc);

	struct objnode next, found = avl_first(&at);
	while (found != NULL) {
	next = AVL_NEXT(&at, found);
	objlist_insert(deleteq_objlist, found->obj);
	found = next;
	}

	void *cookie = NULL;
	while ((found = avl_destroy_nodes(&at, &cookie)) != NULL)
	kmem_free(found, sizeof (*found));
	avl_destroy(&at);
	return (deleteq_objlist);
	}
	#endif

	/*
	* This is the callback function to traverse_dataset for the redaction threads
	* for dmu_redact_snap. This thread is responsible for creating redaction
	* records for all the data that is modified by the snapshots we're redacting
	* with respect to. Redaction records represent ranges of data that have been
	* modified by one of the redaction snapshots, and are stored in the
	* redact_record struct. We need to create redaction records for three
	* cases:
	*
	* First, if there's a normal write, we need to create a redaction record for
	* that block.
	*
	* Second, if there's a hole, we need to create a redaction record that covers
	* the whole range of the hole. If the hole is in the meta-dnode, it must cover
	* every block in all of the objects in the hole.
	*
	* Third, if there is a deleted object, we need to create a redaction record for
	* all of the blocks in that object.
	*/
	/ARGSUSED/
	static int
	redact_cb(spa_t spa, zilog_t zilog, const blkptr_t *bp,
	const zbookmark_phys_t zb, const struct dnode_phys dnp, void *arg)
	{
	struct redact_thread_arg *rta = arg;
	struct redact_record *record;

	ASSERT(zb->zb_object == DMU_META_DNODE_OBJECT \|\|
	zb->zb_object >= rta->resume.zb_object);

	if (rta->cancel)
	return (SET_ERROR(EINTR));

	if (rta->ignore_object == zb->zb_object)
	return (0);

	/*
	* If we're visiting a dnode, we need to handle the case where the
	* object has been deleted.
	*/
	if (zb->zb_level == ZB_DNODE_LEVEL) {
	ASSERT3U(zb->zb_level, ==, ZB_DNODE_LEVEL);

	if (zb->zb_object == 0)
	return (0);

	/*
	* If the object has been deleted, redact all of the blocks in
	* it.
	*/
	if (dnp->dn_type == DMU_OT_NONE \|\|
	objlist_exists(rta->deleted_objs, zb->zb_object)) {
	rta->ignore_object = zb->zb_object;
	record = kmem_zalloc(sizeof (struct redact_record),
	KM_SLEEP);

	record->eos_marker = B_FALSE;
	record->start_object = record->end_object =
	zb->zb_object;
	record->start_blkid = 0;
	record->end_blkid = UINT64_MAX;
	record_merge_enqueue(&rta->q,
	&rta->current_record, record);
	}
	return (0);
	} else if (zb->zb_level < 0) {
	return (0);
	} else if (zb->zb_level > 0 && !BP_IS_HOLE(bp)) {
	/*
	* If this is an indirect block, but not a hole, it doesn't
	* provide any useful information for redaction, so ignore it.
	*/
	return (0);
	}

	/*
	* At this point, there are two options left for the type of block we're
	* looking at. Either this is a hole (which could be in the dnode or
	* the meta-dnode), or it's a level 0 block of some sort. If it's a
	* hole, we create a redaction record that covers the whole range. If
	* the hole is in a dnode, we need to redact all the blocks in that
	* hole. If the hole is in the meta-dnode, we instead need to redact
	* all blocks in every object covered by that hole. If it's a level 0
	* block, we only need to redact that single block.
	*/
	record = kmem_zalloc(sizeof (struct redact_record), KM_SLEEP);
	record->eos_marker = B_FALSE;

	record->start_object = record->end_object = zb->zb_object;
	if (BP_IS_HOLE(bp)) {
	record->start_blkid = zb->zb_blkid *
	bp_span_in_blocks(dnp->dn_indblkshift, zb->zb_level);

	record->end_blkid = ((zb->zb_blkid + 1) *
	bp_span_in_blocks(dnp->dn_indblkshift, zb->zb_level)) - 1;

	if (zb->zb_object == DMU_META_DNODE_OBJECT) {
	record->start_object = record->start_blkid *
	((SPA_MINBLOCKSIZE * dnp->dn_datablkszsec) /
	sizeof (dnode_phys_t));
	record->start_blkid = 0;
	record->end_object = ((record->end_blkid +
	1) * ((SPA_MINBLOCKSIZE * dnp->dn_datablkszsec) /
	sizeof (dnode_phys_t))) - 1;
	record->end_blkid = UINT64_MAX;
	}
	} else if (zb->zb_level != 0 \|\|
	zb->zb_object == DMU_META_DNODE_OBJECT) {
	kmem_free(record, sizeof (*record));
	return (0);
	} else {
	record->start_blkid = record->end_blkid = zb->zb_blkid;
	}
	record->indblkshift = dnp->dn_indblkshift;
	record->datablksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
	record_merge_enqueue(&rta->q, &rta->current_record, record);

	return (0);
	}

	static void
	redact_traverse_thread(void *arg)
	{
	struct redact_thread_arg *rt_arg = arg;
	int err;
	struct redact_record *data;
	#ifdef _KERNEL
	if (rt_arg->os->os_phys->os_type == DMU_OST_ZFS)
	rt_arg->deleted_objs = zfs_get_deleteq(rt_arg->os);
	else
	rt_arg->deleted_objs = objlist_create();
	#else
	rt_arg->deleted_objs = objlist_create();
	#endif

	err = traverse_dataset_resume(rt_arg->ds, rt_arg->txg,
	&rt_arg->resume, TRAVERSE_PRE \| TRAVERSE_PREFETCH_METADATA,
	redact_cb, rt_arg);

	if (err != EINTR)
	rt_arg->error_code = err;
	objlist_destroy(rt_arg->deleted_objs);
	data = kmem_zalloc(sizeof (*data), KM_SLEEP);
	data->eos_marker = B_TRUE;
	record_merge_enqueue(&rt_arg->q, &rt_arg->current_record, data);
	thread_exit();
	}

	static inline void
	create_zbookmark_from_obj_off(zbookmark_phys_t *zb, uint64_t object,
	uint64_t blkid)
	{
	zb->zb_object = object;
	zb->zb_level = 0;
	zb->zb_blkid = blkid;
	}

	/*
	* This is a utility function that can do the comparison for the start or ends
	* of the ranges in a redact_record.
	*/
	static int
	redact_range_compare(uint64_t obj1, uint64_t off1, uint32_t dbss1,
	uint64_t obj2, uint64_t off2, uint32_t dbss2)
	{
	zbookmark_phys_t z1, z2;
	create_zbookmark_from_obj_off(&z1, obj1, off1);
	create_zbookmark_from_obj_off(&z2, obj2, off2);

	return (zbookmark_compare(dbss1 >> SPA_MINBLOCKSHIFT, 0,
	dbss2 >> SPA_MINBLOCKSHIFT, 0, &z1, &z2));
	}

	/*
	* Compare two redaction records by their range's start location. Also makes
	* eos records always compare last. We use the thread number in the redact_node
	* to ensure that records do not compare equal (which is not allowed in our avl
	* trees).
	*/
	static int
	redact_node_compare_start(const void arg1, const void arg2)
	{
	const struct redact_node *rn1 = arg1;
	const struct redact_node *rn2 = arg2;
	const struct redact_record *rr1 = rn1->record;
	const struct redact_record *rr2 = rn2->record;
	if (rr1->eos_marker)
	return (1);
	if (rr2->eos_marker)
	return (-1);

	int cmp = redact_range_compare(rr1->start_object, rr1->start_blkid,
	rr1->datablksz, rr2->start_object, rr2->start_blkid,
	rr2->datablksz);
	if (cmp == 0)
	cmp = (rn1->thread_num < rn2->thread_num ? -1 : 1);
	return (cmp);
	}

	/*
	* Compare two redaction records by their range's end location. Also makes
	* eos records always compare last. We use the thread number in the redact_node
	* to ensure that records do not compare equal (which is not allowed in our avl
	* trees).
	*/
	static int
	redact_node_compare_end(const void arg1, const void arg2)
	{
	const struct redact_node *rn1 = arg1;
	const struct redact_node *rn2 = arg2;
	const struct redact_record *srr1 = rn1->record;
	const struct redact_record *srr2 = rn2->record;
	if (srr1->eos_marker)
	return (1);
	if (srr2->eos_marker)
	return (-1);

	int cmp = redact_range_compare(srr1->end_object, srr1->end_blkid,
	srr1->datablksz, srr2->end_object, srr2->end_blkid,
	srr2->datablksz);
	if (cmp == 0)
	cmp = (rn1->thread_num < rn2->thread_num ? -1 : 1);
	return (cmp);
	}

	/*
	* Utility function that compares two redaction records to determine if any part
	* of the "from" record is before any part of the "to" record. Also causes End
	* of Stream redaction records to compare after all others, so that the
	* redaction merging logic can stay simple.
	*/
	static boolean_t
	redact_record_before(const struct redact_record *from,
	const struct redact_record *to)
	{
	if (from->eos_marker == B_TRUE)
	return (B_FALSE);
	else if (to->eos_marker == B_TRUE)
	return (B_TRUE);
	return (redact_range_compare(from->start_object, from->start_blkid,
	from->datablksz, to->end_object, to->end_blkid,
	to->datablksz) <= 0);
	}

	/*
	* Pop a new redaction record off the queue, check that the records are in the
	* right order, and free the old data.
	*/
	static struct redact_record *
	get_next_redact_record(bqueue_t bq, struct redact_record prev)
	{
	struct redact_record *next = bqueue_dequeue(bq);
	ASSERT(redact_record_before(prev, next));
	kmem_free(prev, sizeof (*prev));
	return (next);
	}

	/*
	* Remove the given redaction node from both trees, pull a new redaction record
	* off the queue, free the old redaction record, update the redaction node, and
	* reinsert the node into the trees.
	*/
	static int
	update_avl_trees(avl_tree_t start_tree, avl_tree_t end_tree,
	struct redact_node *redact_node)
	{
	avl_remove(start_tree, redact_node);
	avl_remove(end_tree, redact_node);
	redact_node->record = get_next_redact_record(&redact_node->rt_arg->q,
	redact_node->record);
	avl_add(end_tree, redact_node);
	avl_add(start_tree, redact_node);
	return (redact_node->rt_arg->error_code);
	}

	/*
	* Synctask for updating redaction lists. We first take this txg's list of
	* redacted blocks and append those to the redaction list. We then update the
	* redaction list's bonus buffer. We store the furthest blocks we visited and
	* the list of snapshots that we're redacting with respect to. We need these so
	* that redacted sends and receives can be correctly resumed.
	*/
	static void
	redaction_list_update_sync(void arg, dmu_tx_t tx)
	{
	struct merge_data *md = arg;
	uint64_t txg = dmu_tx_get_txg(tx);
	list_t *list = &md->md_blocks[txg & TXG_MASK];
	redact_block_phys_t *furthest_visited =
	&md->md_furthest[txg & TXG_MASK];
	objset_t *mos = tx->tx_pool->dp_meta_objset;
	redaction_list_t *rl = md->md_redaction_list;
	int bufsize = redact_sync_bufsize;
	redact_block_phys_t buf = kmem_alloc(bufsize sizeof (*buf),
	KM_SLEEP);
	int index = 0;

	dmu_buf_will_dirty(rl->rl_dbuf, tx);

	for (struct redact_block_list_node *rbln = list_remove_head(list);
	rbln != NULL; rbln = list_remove_head(list)) {
	ASSERT3U(rbln->block.rbp_object, <=,
	furthest_visited->rbp_object);
	ASSERT(rbln->block.rbp_object < furthest_visited->rbp_object \|\|
	rbln->block.rbp_blkid <= furthest_visited->rbp_blkid);
	buf[index] = rbln->block;
	index++;
	if (index == bufsize) {
	dmu_write(mos, rl->rl_object,
	rl->rl_phys->rlp_num_entries * sizeof (*buf),
	bufsize * sizeof (*buf), buf, tx);
	rl->rl_phys->rlp_num_entries += bufsize;
	index = 0;
	}
	kmem_free(rbln, sizeof (*rbln));
	}
	if (index > 0) {
	dmu_write(mos, rl->rl_object, rl->rl_phys->rlp_num_entries *
	sizeof (buf), index sizeof (*buf), buf, tx);
	rl->rl_phys->rlp_num_entries += index;
	}
	kmem_free(buf, bufsize * sizeof (*buf));

	md->md_synctask_txg[txg & TXG_MASK] = B_FALSE;
	rl->rl_phys->rlp_last_object = furthest_visited->rbp_object;
	rl->rl_phys->rlp_last_blkid = furthest_visited->rbp_blkid;
	}

	static void
	commit_rl_updates(objset_t os, struct merge_data md, uint64_t object,
	uint64_t blkid)
	{
	dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(os->os_spa)->dp_mos_dir);
	dmu_tx_hold_space(tx, sizeof (struct redact_block_list_node));
	VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
	uint64_t txg = dmu_tx_get_txg(tx);
	if (!md->md_synctask_txg[txg & TXG_MASK]) {
	dsl_sync_task_nowait(dmu_tx_pool(tx),
	redaction_list_update_sync, md, tx);
	md->md_synctask_txg[txg & TXG_MASK] = B_TRUE;
	md->md_latest_synctask_txg = txg;
	}
	md->md_furthest[txg & TXG_MASK].rbp_object = object;
	md->md_furthest[txg & TXG_MASK].rbp_blkid = blkid;
	list_move_tail(&md->md_blocks[txg & TXG_MASK],
	&md->md_redact_block_pending);
	dmu_tx_commit(tx);
	md->md_last_time = gethrtime();
	}

	/*
	* We want to store the list of blocks that we're redacting in the bookmark's
	* redaction list. However, this list is stored in the MOS, which means it can
	* only be written to in syncing context. To get around this, we create a
	* synctask that will write to the mos for us. We tell it what to write by
	* a linked list for each current transaction group; every time we decide to
	* redact a block, we append it to the transaction group that is currently in
	* open context. We also update some progress information that the synctask
	* will store to enable resumable redacted sends.
	*/
	static void
	update_redaction_list(struct merge_data md, objset_t os,
	uint64_t object, uint64_t blkid, uint64_t endblkid, uint32_t blksz)
	{
	boolean_t enqueue = B_FALSE;
	redact_block_phys_t cur = {0};
	uint64_t count = endblkid - blkid + 1;
	while (count > REDACT_BLOCK_MAX_COUNT) {
	update_redaction_list(md, os, object, blkid,
	blkid + REDACT_BLOCK_MAX_COUNT - 1, blksz);
	blkid += REDACT_BLOCK_MAX_COUNT;
	count -= REDACT_BLOCK_MAX_COUNT;
	}
	redact_block_phys_t *coalesce = &md->md_coalesce_block;
	boolean_t new;
	if (coalesce->rbp_size_count == 0) {
	new = B_TRUE;
	enqueue = B_FALSE;
	} else {
	uint64_t old_count = redact_block_get_count(coalesce);
	if (coalesce->rbp_object == object &&
	coalesce->rbp_blkid + old_count == blkid &&
	old_count + count <= REDACT_BLOCK_MAX_COUNT) {
	ASSERT3U(redact_block_get_size(coalesce), ==, blksz);
	redact_block_set_count(coalesce, old_count + count);
	new = B_FALSE;
	enqueue = B_FALSE;
	} else {
	new = B_TRUE;
	enqueue = B_TRUE;
	}
	}

	if (new) {
	cur = *coalesce;
	coalesce->rbp_blkid = blkid;
	coalesce->rbp_object = object;

	redact_block_set_count(coalesce, count);
	redact_block_set_size(coalesce, blksz);
	}

	if (enqueue && redact_block_get_size(&cur) != 0) {
	struct redact_block_list_node *rbln =
	kmem_alloc(sizeof (struct redact_block_list_node),
	KM_SLEEP);
	rbln->block = cur;
	list_insert_tail(&md->md_redact_block_pending, rbln);
	}

	if (gethrtime() > md->md_last_time +
	redaction_list_update_interval_ns) {
	commit_rl_updates(os, md, object, blkid);
	}
	}

	/*
	* This thread merges all the redaction records provided by the worker threads,
	* and determines which blocks are redacted by all the snapshots. The algorithm
	* for doing so is similar to performing a merge in mergesort with n sub-lists
	* instead of 2, with some added complexity due to the fact that the entries are
	* ranges, not just single blocks. This algorithm relies on the fact that the
	* queues are sorted, which is ensured by the fact that traverse_dataset
	* traverses the dataset in a consistent order. We pull one entry off the front
	* of the queues of each secure dataset traversal thread. Then we repeat the
	* following: each record represents a range of blocks modified by one of the
	* redaction snapshots, and each block in that range may need to be redacted in
	* the send stream. Find the record with the latest start of its range, and the
	* record with the earliest end of its range. If the last start is before the
	* first end, then we know that the blocks in the range [last_start, first_end]
	* are covered by all of the ranges at the front of the queues, which means
	* every thread redacts that whole range. For example, let's say the ranges on
	* each queue look like this:
	*
	* Block Id 1 2 3 4 5 6 7 8 9 10 11
	* Thread 1 \| [====================]
	* Thread 2 \| [========]
	* Thread 3 \| [=================]
	*
	* Thread 3 has the last start (5), and the thread 2 has the last end (6). All
	* three threads modified the range [5,6], so that data should not be sent over
	* the wire. After we've determined whether or not to redact anything, we take
	* the record with the first end. We discard that record, and pull a new one
	* off the front of the queue it came from. In the above example, we would
	* discard Thread 2's record, and pull a new one. Let's say the next record we
	* pulled from Thread 2 covered range [10,11]. The new layout would look like
	* this:
	*
	* Block Id 1 2 3 4 5 6 7 8 9 10 11
	* Thread 1 \| [====================]
	* Thread 2 \| [==]
	* Thread 3 \| [=================]
	*
	* When we compare the last start (10, from Thread 2) and the first end (9, from
	* Thread 1), we see that the last start is greater than the first end.
	* Therefore, we do not redact anything from these records. We'll iterate by
	* replacing the record from Thread 1.
	*
	* We iterate by replacing the record with the lowest end because we know
	* that the record with the lowest end has helped us as much as it can. All the
	* ranges before it that we will ever redact have been redacted. In addition,
	* by replacing the one with the lowest end, we guarantee we catch all ranges
	* that need to be redacted. For example, if in the case above we had replaced
	* the record from Thread 1 instead, we might have ended up with the following:
	*
	* Block Id 1 2 3 4 5 6 7 8 9 10 11 12
	* Thread 1 \| [==]
	* Thread 2 \| [========]
	* Thread 3 \| [=================]
	*
	* If the next record from Thread 2 had been [8,10], for example, we should have
	* redacted part of that range, but because we updated Thread 1's record, we
	* missed it.
	*
	* We implement this algorithm by using two trees. The first sorts the
	* redaction records by their start_zb, and the second sorts them by their
	* end_zb. We use these to find the record with the last start and the record
	* with the first end. We create a record with that start and end, and send it
	* on. The overall runtime of this implementation is O(n log m), where n is the
	* total number of redaction records from all the different redaction snapshots,
	* and m is the number of redaction snapshots.
	*
	* If we redact with respect to zero snapshots, we create a redaction
	* record with the start object and blkid to 0, and the end object and blkid to
	* UINT64_MAX. This will result in us redacting every block.
	*/
	static int
	perform_thread_merge(bqueue_t *q, uint32_t num_threads,
	struct redact_thread_arg thread_args, boolean_t cancel)
	{
	struct redact_node *redact_nodes = NULL;
	avl_tree_t start_tree, end_tree;
	struct redact_record *record;
	struct redact_record *current_record = NULL;
	int err = 0;
	struct merge_data md = { {0} };
	list_create(&md.md_redact_block_pending,
	sizeof (struct redact_block_list_node),
	offsetof(struct redact_block_list_node, node));

	/*
	* If we're redacting with respect to zero snapshots, then no data is
	* permitted to be sent. We enqueue a record that redacts all blocks,
	* and an eos marker.
	*/
	if (num_threads == 0) {
	record = kmem_zalloc(sizeof (struct redact_record),
	KM_SLEEP);
	// We can't redact object 0, so don't try.
	record->start_object = 1;
	record->start_blkid = 0;
	record->end_object = record->end_blkid = UINT64_MAX;
	bqueue_enqueue(q, record, sizeof (*record));
	return (0);
	}
	if (num_threads > 0) {
	redact_nodes = kmem_zalloc(num_threads *
	sizeof (*redact_nodes), KM_SLEEP);
	}

	avl_create(&start_tree, redact_node_compare_start,
	sizeof (struct redact_node),
	offsetof(struct redact_node, avl_node_start));
	avl_create(&end_tree, redact_node_compare_end,
	sizeof (struct redact_node),
	offsetof(struct redact_node, avl_node_end));

	for (int i = 0; i < num_threads; i++) {
	struct redact_node *node = &redact_nodes[i];
	struct redact_thread_arg *targ = &thread_args[i];
	node->record = bqueue_dequeue(&targ->q);
	node->rt_arg = targ;
	node->thread_num = i;
	avl_add(&start_tree, node);
	avl_add(&end_tree, node);
	}

	/*
	* Once the first record in the end tree has returned EOS, every record
	* must be an EOS record, so we should stop.
	*/
	while (err == 0 && !((struct redact_node *)avl_first(&end_tree))->
	record->eos_marker) {
	if (*cancel) {
	err = EINTR;
	break;
	}
	struct redact_node *last_start = avl_last(&start_tree);
	struct redact_node *first_end = avl_first(&end_tree);

	/*
	* If the last start record is before the first end record,
	* then we have blocks that are redacted by all threads.
	* Therefore, we should redact them. Copy the record, and send
	* it to the main thread.
	*/
	if (redact_record_before(last_start->record,
	first_end->record)) {
	record = kmem_zalloc(sizeof (struct redact_record),
	KM_SLEEP);
	record = first_end->record;
	record->start_object = last_start->record->start_object;
	record->start_blkid = last_start->record->start_blkid;
	record_merge_enqueue(q, &current_record,
	record);
	}
	err = update_avl_trees(&start_tree, &end_tree, first_end);
	}

	/*
	* We're done; if we were cancelled, we need to cancel our workers and
	* clear out their queues. Either way, we need to remove every thread's
	* redact_node struct from the avl trees.
	*/
	for (int i = 0; i < num_threads; i++) {
	if (err != 0) {
	thread_args[i].cancel = B_TRUE;
	while (!redact_nodes[i].record->eos_marker) {
	(void) update_avl_trees(&start_tree, &end_tree,
	&redact_nodes[i]);
	}
	}
	avl_remove(&start_tree, &redact_nodes[i]);
	avl_remove(&end_tree, &redact_nodes[i]);
	kmem_free(redact_nodes[i].record,
	sizeof (struct redact_record));
	+ bqueue_destroy(&thread_args[i].q);
	}

	avl_destroy(&start_tree);
	avl_destroy(&end_tree);
	kmem_free(redact_nodes, num_threads * sizeof (*redact_nodes));
	if (current_record != NULL)
	bqueue_enqueue(q, current_record, sizeof (current_record));
	return (err);
	}

	struct redact_merge_thread_arg {
	bqueue_t q;
	spa_t *spa;
	int numsnaps;
	struct redact_thread_arg *thr_args;
	boolean_t cancel;
	int error_code;
	};

	static void
	redact_merge_thread(void *arg)
	{
	struct redact_merge_thread_arg *rmta = arg;
	rmta->error_code = perform_thread_merge(&rmta->q,
	rmta->numsnaps, rmta->thr_args, &rmta->cancel);
	struct redact_record rec = kmem_zalloc(sizeof (rec), KM_SLEEP);
	rec->eos_marker = B_TRUE;
	bqueue_enqueue_flush(&rmta->q, rec, 1);
	thread_exit();
	}

	/*
	* Find the next object in or after the redaction range passed in, and hold
	* its dnode with the provided tag. Also update *object to contain the new
	* object number.
	*/
	static int
	hold_next_object(objset_t os, struct redact_record rec, void *tag,
	uint64_t object, dnode_t *dn)
	{
	int err = 0;
	if (*dn != NULL)
	dnode_rele(*dn, tag);
	*dn = NULL;
	if (*object < rec->start_object) {
	*object = rec->start_object - 1;
	}
	err = dmu_object_next(os, object, B_FALSE, 0);
	if (err != 0)
	return (err);

	err = dnode_hold(os, *object, tag, dn);
	while (err == 0 && (*object < rec->start_object \|\|
	DMU_OT_IS_METADATA((*dn)->dn_type))) {
	dnode_rele(*dn, tag);
	*dn = NULL;
	err = dmu_object_next(os, object, B_FALSE, 0);
	if (err != 0)
	break;
	err = dnode_hold(os, *object, tag, dn);
	}
	return (err);
	}

	static int
	perform_redaction(objset_t os, redaction_list_t rl,
	struct redact_merge_thread_arg *rmta)
	{
	int err = 0;
	bqueue_t *q = &rmta->q;
	struct redact_record *rec = NULL;
	struct merge_data md = { {0} };

	list_create(&md.md_redact_block_pending,
	sizeof (struct redact_block_list_node),
	offsetof(struct redact_block_list_node, node));
	md.md_redaction_list = rl;

	for (int i = 0; i < TXG_SIZE; i++) {
	list_create(&md.md_blocks[i],
	sizeof (struct redact_block_list_node),
	offsetof(struct redact_block_list_node, node));
	}
	dnode_t *dn = NULL;
	uint64_t prev_obj = 0;
	for (rec = bqueue_dequeue(q); !rec->eos_marker && err == 0;
	rec = get_next_redact_record(q, rec)) {
	ASSERT3U(rec->start_object, !=, 0);
	uint64_t object;
	if (prev_obj != rec->start_object) {
	object = rec->start_object - 1;
	err = hold_next_object(os, rec, FTAG, &object, &dn);
	} else {
	object = prev_obj;
	}
	while (err == 0 && object <= rec->end_object) {
	if (issig(JUSTLOOKING) && issig(FORREAL)) {
	err = EINTR;
	break;
	}
	/*
	* Part of the current object is contained somewhere in
	* the range covered by rec.
	*/
	uint64_t startblkid;
	uint64_t endblkid;
	uint64_t maxblkid = dn->dn_phys->dn_maxblkid;

	if (rec->start_object < object)
	startblkid = 0;
	else if (rec->start_blkid > maxblkid)
	break;
	else
	startblkid = rec->start_blkid;

	if (rec->end_object > object \|\| rec->end_blkid >
	maxblkid) {
	endblkid = maxblkid;
	} else {
	endblkid = rec->end_blkid;
	}
	update_redaction_list(&md, os, object, startblkid,
	endblkid, dn->dn_datablksz);

	if (object == rec->end_object)
	break;
	err = hold_next_object(os, rec, FTAG, &object, &dn);
	}
	if (err == ESRCH)
	err = 0;
	if (dn != NULL)
	prev_obj = object;
	}
	if (err == 0 && dn != NULL)
	dnode_rele(dn, FTAG);

	if (err == ESRCH)
	err = 0;
	rmta->cancel = B_TRUE;
	while (!rec->eos_marker)
	rec = get_next_redact_record(q, rec);
	kmem_free(rec, sizeof (*rec));

	/*
	* There may be a block that's being coalesced, sync that out before we
	* return.
	*/
	if (err == 0 && md.md_coalesce_block.rbp_size_count != 0) {
	struct redact_block_list_node *rbln =
	kmem_alloc(sizeof (struct redact_block_list_node),
	KM_SLEEP);
	rbln->block = md.md_coalesce_block;
	list_insert_tail(&md.md_redact_block_pending, rbln);
	}
	commit_rl_updates(os, &md, UINT64_MAX, UINT64_MAX);

	/*
	* Wait for all the redaction info to sync out before we return, so that
	* anyone who attempts to resume this redaction will have all the data
	* they need.
	*/
	dsl_pool_t *dp = spa_get_dsl(os->os_spa);
	if (md.md_latest_synctask_txg != 0)
	txg_wait_synced(dp, md.md_latest_synctask_txg);
	for (int i = 0; i < TXG_SIZE; i++)
	list_destroy(&md.md_blocks[i]);
	return (err);
	}

	static boolean_t
	redact_snaps_contains(uint64_t *snaps, uint64_t num_snaps, uint64_t guid)
	{
	for (int i = 0; i < num_snaps; i++) {
	if (snaps[i] == guid)
	return (B_TRUE);
	}
	return (B_FALSE);
	}

	int
	dmu_redact_snap(const char snapname, nvlist_t redactnvl,
	const char *redactbook)
	{
	int err = 0;
	dsl_pool_t *dp = NULL;
	dsl_dataset_t *ds = NULL;
	int numsnaps = 0;
	objset_t *os;
	struct redact_thread_arg *args = NULL;
	redaction_list_t *new_rl = NULL;
	char *newredactbook;

	if ((err = dsl_pool_hold(snapname, FTAG, &dp)) != 0)
	return (err);

	newredactbook = kmem_zalloc(sizeof (char) * ZFS_MAX_DATASET_NAME_LEN,
	KM_SLEEP);

	if ((err = dsl_dataset_hold_flags(dp, snapname, DS_HOLD_FLAG_DECRYPT,
	FTAG, &ds)) != 0) {
	goto out;
	}
	dsl_dataset_long_hold(ds, FTAG);
	if (!ds->ds_is_snapshot \|\| dmu_objset_from_ds(ds, &os) != 0) {
	err = EINVAL;
	goto out;
	}
	if (dsl_dataset_feature_is_active(ds, SPA_FEATURE_REDACTED_DATASETS)) {
	err = EALREADY;
	goto out;
	}

	numsnaps = fnvlist_num_pairs(redactnvl);
	if (numsnaps > 0)
	args = kmem_zalloc(numsnaps * sizeof (*args), KM_SLEEP);

	nvpair_t *pair = NULL;
	for (int i = 0; i < numsnaps; i++) {
	pair = nvlist_next_nvpair(redactnvl, pair);
	const char *name = nvpair_name(pair);
	struct redact_thread_arg *rta = &args[i];
	err = dsl_dataset_hold_flags(dp, name, DS_HOLD_FLAG_DECRYPT,
	FTAG, &rta->ds);
	if (err != 0)
	break;
	/*
	* We want to do the long hold before we can get any other
	* errors, because the cleanup code will release the long
	* hold if rta->ds is filled in.
	*/
	dsl_dataset_long_hold(rta->ds, FTAG);

	err = dmu_objset_from_ds(rta->ds, &rta->os);
	if (err != 0)
	break;
	if (!dsl_dataset_is_before(rta->ds, ds, 0)) {
	err = EINVAL;
	break;
	}
	if (dsl_dataset_feature_is_active(rta->ds,
	SPA_FEATURE_REDACTED_DATASETS)) {
	err = EALREADY;
	break;

	}
	}
	if (err != 0)
	goto out;
	VERIFY3P(nvlist_next_nvpair(redactnvl, pair), ==, NULL);

	boolean_t resuming = B_FALSE;
	zfs_bookmark_phys_t bookmark;

	(void) strlcpy(newredactbook, snapname, ZFS_MAX_DATASET_NAME_LEN);
	char *c = strchr(newredactbook, '@');
	ASSERT3P(c, !=, NULL);
	int n = snprintf(c, ZFS_MAX_DATASET_NAME_LEN - (c - newredactbook),
	"#%s", redactbook);
	if (n >= ZFS_MAX_DATASET_NAME_LEN - (c - newredactbook)) {
	dsl_pool_rele(dp, FTAG);
	kmem_free(newredactbook,
	sizeof (char) * ZFS_MAX_DATASET_NAME_LEN);
	if (args != NULL)
	kmem_free(args, numsnaps * sizeof (*args));
	return (SET_ERROR(ENAMETOOLONG));
	}
	err = dsl_bookmark_lookup(dp, newredactbook, NULL, &bookmark);
	if (err == 0) {
	resuming = B_TRUE;
	if (bookmark.zbm_redaction_obj == 0) {
	err = EEXIST;
	goto out;
	}
	err = dsl_redaction_list_hold_obj(dp,
	bookmark.zbm_redaction_obj, FTAG, &new_rl);
	if (err != 0) {
	err = EIO;
	goto out;
	}
	dsl_redaction_list_long_hold(dp, new_rl, FTAG);
	if (new_rl->rl_phys->rlp_num_snaps != numsnaps) {
	err = ESRCH;
	goto out;
	}
	for (int i = 0; i < numsnaps; i++) {
	struct redact_thread_arg *rta = &args[i];
	if (!redact_snaps_contains(new_rl->rl_phys->rlp_snaps,
	new_rl->rl_phys->rlp_num_snaps,
	dsl_dataset_phys(rta->ds)->ds_guid)) {
	err = ESRCH;
	goto out;
	}
	}
	if (new_rl->rl_phys->rlp_last_blkid == UINT64_MAX &&
	new_rl->rl_phys->rlp_last_object == UINT64_MAX) {
	err = EEXIST;
	goto out;
	}
	dsl_pool_rele(dp, FTAG);
	dp = NULL;
	} else {
	uint64_t *guids = NULL;
	if (numsnaps > 0) {
	guids = kmem_zalloc(numsnaps * sizeof (uint64_t),
	KM_SLEEP);
	}
	for (int i = 0; i < numsnaps; i++) {
	struct redact_thread_arg *rta = &args[i];
	guids[i] = dsl_dataset_phys(rta->ds)->ds_guid;
	}

	dsl_pool_rele(dp, FTAG);
	dp = NULL;
	err = dsl_bookmark_create_redacted(newredactbook, snapname,
	numsnaps, guids, FTAG, &new_rl);
	kmem_free(guids, numsnaps * sizeof (uint64_t));
	if (err != 0) {
	goto out;
	}
	}

	for (int i = 0; i < numsnaps; i++) {
	struct redact_thread_arg *rta = &args[i];
	(void) bqueue_init(&rta->q, zfs_redact_queue_ff,
	zfs_redact_queue_length,
	offsetof(struct redact_record, ln));
	if (resuming) {
	rta->resume.zb_blkid =
	new_rl->rl_phys->rlp_last_blkid;
	rta->resume.zb_object =
	new_rl->rl_phys->rlp_last_object;
	}
	rta->txg = dsl_dataset_phys(ds)->ds_creation_txg;
	(void) thread_create(NULL, 0, redact_traverse_thread, rta,
	0, curproc, TS_RUN, minclsyspri);
	}

	struct redact_merge_thread_arg *rmta;
	rmta = kmem_zalloc(sizeof (struct redact_merge_thread_arg), KM_SLEEP);

	(void) bqueue_init(&rmta->q, zfs_redact_queue_ff,
	zfs_redact_queue_length, offsetof(struct redact_record, ln));
	rmta->numsnaps = numsnaps;
	rmta->spa = os->os_spa;
	rmta->thr_args = args;
	(void) thread_create(NULL, 0, redact_merge_thread, rmta, 0, curproc,
	TS_RUN, minclsyspri);
	err = perform_redaction(os, new_rl, rmta);
	+ bqueue_destroy(&rmta->q);
	kmem_free(rmta, sizeof (struct redact_merge_thread_arg));

	out:
	kmem_free(newredactbook, sizeof (char) * ZFS_MAX_DATASET_NAME_LEN);

	if (new_rl != NULL) {
	dsl_redaction_list_long_rele(new_rl, FTAG);
	dsl_redaction_list_rele(new_rl, FTAG);
	}
	for (int i = 0; i < numsnaps; i++) {
	struct redact_thread_arg *rta = &args[i];
	/*
	* rta->ds may be NULL if we got an error while filling
	* it in.
	*/
	if (rta->ds != NULL) {
	dsl_dataset_long_rele(rta->ds, FTAG);
	dsl_dataset_rele_flags(rta->ds,
	DS_HOLD_FLAG_DECRYPT, FTAG);
	}
	}

	if (args != NULL)
	kmem_free(args, numsnaps * sizeof (*args));
	if (dp != NULL)
	dsl_pool_rele(dp, FTAG);
	if (ds != NULL) {
	dsl_dataset_long_rele(ds, FTAG);
	dsl_dataset_rele_flags(ds, DS_HOLD_FLAG_DECRYPT, FTAG);
	}
	return (SET_ERROR(err));

	}
	diff --git a/sys/contrib/openzfs/module/zfs/dmu_send.c b/sys/contrib/openzfs/module/zfs/dmu_send.c
	index d654382237c0..0658e13c2d25 100644
	--- a/sys/contrib/openzfs/module/zfs/dmu_send.c
	+++ b/sys/contrib/openzfs/module/zfs/dmu_send.c
	@@ -1,3094 +1,3096 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2011, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2014, Joyent, Inc. All rights reserved.
	* Copyright 2014 HybridCluster. All rights reserved.
	* Copyright 2016 RackTop Systems.
	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	* Copyright (c) 2019, Klara Inc.
	* Copyright (c) 2019, Allan Jude
	*/

	#include <sys/dmu.h>
	#include <sys/dmu_impl.h>
	#include <sys/dmu_tx.h>
	#include <sys/dbuf.h>
	#include <sys/dnode.h>
	#include <sys/zfs_context.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_synctask.h>
	#include <sys/spa_impl.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zap.h>
	#include <sys/zio_checksum.h>
	#include <sys/zfs_znode.h>
	#include <zfs_fletcher.h>
	#include <sys/avl.h>
	#include <sys/ddt.h>
	#include <sys/zfs_onexit.h>
	#include <sys/dmu_send.h>
	#include <sys/dmu_recv.h>
	#include <sys/dsl_destroy.h>
	#include <sys/blkptr.h>
	#include <sys/dsl_bookmark.h>
	#include <sys/zfeature.h>
	#include <sys/bqueue.h>
	#include <sys/zvol.h>
	#include <sys/policy.h>
	#include <sys/objlist.h>
	#ifdef _KERNEL
	#include <sys/zfs_vfsops.h>
	#endif

	/* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
	int zfs_send_corrupt_data = B_FALSE;
	/*
	* This tunable controls the amount of data (measured in bytes) that will be
	* prefetched by zfs send. If the main thread is blocking on reads that haven't
	* completed, this variable might need to be increased. If instead the main
	* thread is issuing new reads because the prefetches have fallen out of the
	* cache, this may need to be decreased.
	*/
	int zfs_send_queue_length = SPA_MAXBLOCKSIZE;
	/*
	* This tunable controls the length of the queues that zfs send worker threads
	* use to communicate. If the send_main_thread is blocking on these queues,
	* this variable may need to be increased. If there is a significant slowdown
	* at the start of a send as these threads consume all the available IO
	* resources, this variable may need to be decreased.
	*/
	int zfs_send_no_prefetch_queue_length = 1024 * 1024;
	/*
	* These tunables control the fill fraction of the queues by zfs send. The fill
	* fraction controls the frequency with which threads have to be cv_signaled.
	* If a lot of cpu time is being spent on cv_signal, then these should be tuned
	* down. If the queues empty before the signalled thread can catch up, then
	* these should be tuned up.
	*/
	int zfs_send_queue_ff = 20;
	int zfs_send_no_prefetch_queue_ff = 20;

	/*
	* Use this to override the recordsize calculation for fast zfs send estimates.
	*/
	int zfs_override_estimate_recordsize = 0;

	/* Set this tunable to FALSE to disable setting of DRR_FLAG_FREERECORDS */
	int zfs_send_set_freerecords_bit = B_TRUE;

	/* Set this tunable to FALSE is disable sending unmodified spill blocks. */
	int zfs_send_unmodified_spill_blocks = B_TRUE;

	static inline boolean_t
	overflow_multiply(uint64_t a, uint64_t b, uint64_t *c)
	{
	uint64_t temp = a * b;
	if (b != 0 && temp / b != a)
	return (B_FALSE);
	*c = temp;
	return (B_TRUE);
	}

	struct send_thread_arg {
	bqueue_t q;
	objset_t os; / Objset to traverse */
	uint64_t fromtxg; /* Traverse from this txg */
	int flags; /* flags to pass to traverse_dataset */
	int error_code;
	boolean_t cancel;
	zbookmark_phys_t resume;
	uint64_t *num_blocks_visited;
	};

	struct redact_list_thread_arg {
	boolean_t cancel;
	bqueue_t q;
	zbookmark_phys_t resume;
	redaction_list_t *rl;
	boolean_t mark_redact;
	int error_code;
	uint64_t *num_blocks_visited;
	};

	struct send_merge_thread_arg {
	bqueue_t q;
	objset_t *os;
	struct redact_list_thread_arg *from_arg;
	struct send_thread_arg *to_arg;
	struct redact_list_thread_arg *redact_arg;
	int error;
	boolean_t cancel;
	};

	struct send_range {
	boolean_t eos_marker; /* Marks the end of the stream */
	uint64_t object;
	uint64_t start_blkid;
	uint64_t end_blkid;
	bqueue_node_t ln;
	enum type {DATA, HOLE, OBJECT, OBJECT_RANGE, REDACT,
	PREVIOUSLY_REDACTED} type;
	union {
	struct srd {
	dmu_object_type_t obj_type;
	uint32_t datablksz; // logical size
	uint32_t datasz; // payload size
	blkptr_t bp;
	arc_buf_t *abuf;
	abd_t *abd;
	kmutex_t lock;
	kcondvar_t cv;
	boolean_t io_outstanding;
	int io_err;
	} data;
	struct srh {
	uint32_t datablksz;
	} hole;
	struct sro {
	/*
	* This is a pointer because embedding it in the
	* struct causes these structures to be massively larger
	* for all range types; this makes the code much less
	* memory efficient.
	*/
	dnode_phys_t *dnp;
	blkptr_t bp;
	} object;
	struct srr {
	uint32_t datablksz;
	} redact;
	struct sror {
	blkptr_t bp;
	} object_range;
	} sru;
	};

	/*
	* The list of data whose inclusion in a send stream can be pending from
	* one call to backup_cb to another. Multiple calls to dump_free(),
	* dump_freeobjects(), and dump_redact() can be aggregated into a single
	* DRR_FREE, DRR_FREEOBJECTS, or DRR_REDACT replay record.
	*/
	typedef enum {
	PENDING_NONE,
	PENDING_FREE,
	PENDING_FREEOBJECTS,
	PENDING_REDACT
	} dmu_pendop_t;

	typedef struct dmu_send_cookie {
	dmu_replay_record_t *dsc_drr;
	dmu_send_outparams_t *dsc_dso;
	offset_t *dsc_off;
	objset_t *dsc_os;
	zio_cksum_t dsc_zc;
	uint64_t dsc_toguid;
	uint64_t dsc_fromtxg;
	int dsc_err;
	dmu_pendop_t dsc_pending_op;
	uint64_t dsc_featureflags;
	uint64_t dsc_last_data_object;
	uint64_t dsc_last_data_offset;
	uint64_t dsc_resume_object;
	uint64_t dsc_resume_offset;
	boolean_t dsc_sent_begin;
	boolean_t dsc_sent_end;
	} dmu_send_cookie_t;

	static int do_dump(dmu_send_cookie_t dscp, struct send_range range);

	static void
	range_free(struct send_range *range)
	{
	if (range->type == OBJECT) {
	size_t size = sizeof (dnode_phys_t) *
	(range->sru.object.dnp->dn_extra_slots + 1);
	kmem_free(range->sru.object.dnp, size);
	} else if (range->type == DATA) {
	mutex_enter(&range->sru.data.lock);
	while (range->sru.data.io_outstanding)
	cv_wait(&range->sru.data.cv, &range->sru.data.lock);
	if (range->sru.data.abd != NULL)
	abd_free(range->sru.data.abd);
	if (range->sru.data.abuf != NULL) {
	arc_buf_destroy(range->sru.data.abuf,
	&range->sru.data.abuf);
	}
	mutex_exit(&range->sru.data.lock);

	cv_destroy(&range->sru.data.cv);
	mutex_destroy(&range->sru.data.lock);
	}
	kmem_free(range, sizeof (*range));
	}

	/*
	* For all record types except BEGIN, fill in the checksum (overlaid in
	* drr_u.drr_checksum.drr_checksum). The checksum verifies everything
	* up to the start of the checksum itself.
	*/
	static int
	dump_record(dmu_send_cookie_t dscp, void payload, int payload_len)
	{
	dmu_send_outparams_t *dso = dscp->dsc_dso;
	ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
	==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t));
	(void) fletcher_4_incremental_native(dscp->dsc_drr,
	offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
	&dscp->dsc_zc);
	if (dscp->dsc_drr->drr_type == DRR_BEGIN) {
	dscp->dsc_sent_begin = B_TRUE;
	} else {
	ASSERT(ZIO_CHECKSUM_IS_ZERO(&dscp->dsc_drr->drr_u.
	drr_checksum.drr_checksum));
	dscp->dsc_drr->drr_u.drr_checksum.drr_checksum = dscp->dsc_zc;
	}
	if (dscp->dsc_drr->drr_type == DRR_END) {
	dscp->dsc_sent_end = B_TRUE;
	}
	(void) fletcher_4_incremental_native(&dscp->dsc_drr->
	drr_u.drr_checksum.drr_checksum,
	sizeof (zio_cksum_t), &dscp->dsc_zc);
	*dscp->dsc_off += sizeof (dmu_replay_record_t);
	dscp->dsc_err = dso->dso_outfunc(dscp->dsc_os, dscp->dsc_drr,
	sizeof (dmu_replay_record_t), dso->dso_arg);
	if (dscp->dsc_err != 0)
	return (SET_ERROR(EINTR));
	if (payload_len != 0) {
	*dscp->dsc_off += payload_len;
	/*
	* payload is null when dso_dryrun == B_TRUE (i.e. when we're
	* doing a send size calculation)
	*/
	if (payload != NULL) {
	(void) fletcher_4_incremental_native(
	payload, payload_len, &dscp->dsc_zc);
	}

	/*
	* The code does not rely on this (len being a multiple of 8).
	* We keep this assertion because of the corresponding assertion
	* in receive_read(). Keeping this assertion ensures that we do
	* not inadvertently break backwards compatibility (causing the
	* assertion in receive_read() to trigger on old software).
	*
	* Raw sends cannot be received on old software, and so can
	* bypass this assertion.
	*/

	ASSERT((payload_len % 8 == 0) \|\|
	(dscp->dsc_featureflags & DMU_BACKUP_FEATURE_RAW));

	dscp->dsc_err = dso->dso_outfunc(dscp->dsc_os, payload,
	payload_len, dso->dso_arg);
	if (dscp->dsc_err != 0)
	return (SET_ERROR(EINTR));
	}
	return (0);
	}

	/*
	* Fill in the drr_free struct, or perform aggregation if the previous record is
	* also a free record, and the two are adjacent.
	*
	* Note that we send free records even for a full send, because we want to be
	* able to receive a full send as a clone, which requires a list of all the free
	* and freeobject records that were generated on the source.
	*/
	static int
	dump_free(dmu_send_cookie_t *dscp, uint64_t object, uint64_t offset,
	uint64_t length)
	{
	struct drr_free *drrf = &(dscp->dsc_drr->drr_u.drr_free);

	/*
	* When we receive a free record, dbuf_free_range() assumes
	* that the receiving system doesn't have any dbufs in the range
	* being freed. This is always true because there is a one-record
	* constraint: we only send one WRITE record for any given
	* object,offset. We know that the one-record constraint is
	* true because we always send data in increasing order by
	* object,offset.
	*
	* If the increasing-order constraint ever changes, we should find
	* another way to assert that the one-record constraint is still
	* satisfied.
	*/
	ASSERT(object > dscp->dsc_last_data_object \|\|
	(object == dscp->dsc_last_data_object &&
	offset > dscp->dsc_last_data_offset));

	/*
	* If there is a pending op, but it's not PENDING_FREE, push it out,
	* since free block aggregation can only be done for blocks of the
	* same type (i.e., DRR_FREE records can only be aggregated with
	* other DRR_FREE records. DRR_FREEOBJECTS records can only be
	* aggregated with other DRR_FREEOBJECTS records).
	*/
	if (dscp->dsc_pending_op != PENDING_NONE &&
	dscp->dsc_pending_op != PENDING_FREE) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}

	if (dscp->dsc_pending_op == PENDING_FREE) {
	/*
	* Check to see whether this free block can be aggregated
	* with pending one.
	*/
	if (drrf->drr_object == object && drrf->drr_offset +
	drrf->drr_length == offset) {
	if (offset + length < offset \|\| length == UINT64_MAX)
	drrf->drr_length = UINT64_MAX;
	else
	drrf->drr_length += length;
	return (0);
	} else {
	/* not a continuation. Push out pending record */
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}
	}
	/* create a FREE record and make it pending */
	bzero(dscp->dsc_drr, sizeof (dmu_replay_record_t));
	dscp->dsc_drr->drr_type = DRR_FREE;
	drrf->drr_object = object;
	drrf->drr_offset = offset;
	if (offset + length < offset)
	drrf->drr_length = DMU_OBJECT_END;
	else
	drrf->drr_length = length;
	drrf->drr_toguid = dscp->dsc_toguid;
	if (length == DMU_OBJECT_END) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	} else {
	dscp->dsc_pending_op = PENDING_FREE;
	}

	return (0);
	}

	/*
	* Fill in the drr_redact struct, or perform aggregation if the previous record
	* is also a redaction record, and the two are adjacent.
	*/
	static int
	dump_redact(dmu_send_cookie_t *dscp, uint64_t object, uint64_t offset,
	uint64_t length)
	{
	struct drr_redact *drrr = &dscp->dsc_drr->drr_u.drr_redact;

	/*
	* If there is a pending op, but it's not PENDING_REDACT, push it out,
	* since free block aggregation can only be done for blocks of the
	* same type (i.e., DRR_REDACT records can only be aggregated with
	* other DRR_REDACT records).
	*/
	if (dscp->dsc_pending_op != PENDING_NONE &&
	dscp->dsc_pending_op != PENDING_REDACT) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}

	if (dscp->dsc_pending_op == PENDING_REDACT) {
	/*
	* Check to see whether this redacted block can be aggregated
	* with pending one.
	*/
	if (drrr->drr_object == object && drrr->drr_offset +
	drrr->drr_length == offset) {
	drrr->drr_length += length;
	return (0);
	} else {
	/* not a continuation. Push out pending record */
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}
	}
	/* create a REDACT record and make it pending */
	bzero(dscp->dsc_drr, sizeof (dmu_replay_record_t));
	dscp->dsc_drr->drr_type = DRR_REDACT;
	drrr->drr_object = object;
	drrr->drr_offset = offset;
	drrr->drr_length = length;
	drrr->drr_toguid = dscp->dsc_toguid;
	dscp->dsc_pending_op = PENDING_REDACT;

	return (0);
	}

	static int
	dmu_dump_write(dmu_send_cookie_t *dscp, dmu_object_type_t type, uint64_t object,
	uint64_t offset, int lsize, int psize, const blkptr_t bp, void data)
	{
	uint64_t payload_size;
	boolean_t raw = (dscp->dsc_featureflags & DMU_BACKUP_FEATURE_RAW);
	struct drr_write *drrw = &(dscp->dsc_drr->drr_u.drr_write);

	/*
	* We send data in increasing object, offset order.
	* See comment in dump_free() for details.
	*/
	ASSERT(object > dscp->dsc_last_data_object \|\|
	(object == dscp->dsc_last_data_object &&
	offset > dscp->dsc_last_data_offset));
	dscp->dsc_last_data_object = object;
	dscp->dsc_last_data_offset = offset + lsize - 1;

	/*
	* If there is any kind of pending aggregation (currently either
	* a grouping of free objects or free blocks), push it out to
	* the stream, since aggregation can't be done across operations
	* of different types.
	*/
	if (dscp->dsc_pending_op != PENDING_NONE) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}
	/* write a WRITE record */
	bzero(dscp->dsc_drr, sizeof (dmu_replay_record_t));
	dscp->dsc_drr->drr_type = DRR_WRITE;
	drrw->drr_object = object;
	drrw->drr_type = type;
	drrw->drr_offset = offset;
	drrw->drr_toguid = dscp->dsc_toguid;
	drrw->drr_logical_size = lsize;

	/* only set the compression fields if the buf is compressed or raw */
	if (raw \|\| lsize != psize) {
	ASSERT(raw \|\| dscp->dsc_featureflags &
	DMU_BACKUP_FEATURE_COMPRESSED);
	ASSERT(!BP_IS_EMBEDDED(bp));
	ASSERT3S(psize, >, 0);

	if (raw) {
	ASSERT(BP_IS_PROTECTED(bp));

	/*
	* This is a raw protected block so we need to pass
	* along everything the receiving side will need to
	* interpret this block, including the byteswap, salt,
	* IV, and MAC.
	*/
	if (BP_SHOULD_BYTESWAP(bp))
	drrw->drr_flags \|= DRR_RAW_BYTESWAP;
	zio_crypt_decode_params_bp(bp, drrw->drr_salt,
	drrw->drr_iv);
	zio_crypt_decode_mac_bp(bp, drrw->drr_mac);
	} else {
	/* this is a compressed block */
	ASSERT(dscp->dsc_featureflags &
	DMU_BACKUP_FEATURE_COMPRESSED);
	ASSERT(!BP_SHOULD_BYTESWAP(bp));
	ASSERT(!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)));
	ASSERT3U(BP_GET_COMPRESS(bp), !=, ZIO_COMPRESS_OFF);
	ASSERT3S(lsize, >=, psize);
	}

	/* set fields common to compressed and raw sends */
	drrw->drr_compressiontype = BP_GET_COMPRESS(bp);
	drrw->drr_compressed_size = psize;
	payload_size = drrw->drr_compressed_size;
	} else {
	payload_size = drrw->drr_logical_size;
	}

	if (bp == NULL \|\| BP_IS_EMBEDDED(bp) \|\| (BP_IS_PROTECTED(bp) && !raw)) {
	/*
	* There's no pre-computed checksum for partial-block writes,
	* embedded BP's, or encrypted BP's that are being sent as
	* plaintext, so (like fletcher4-checksummed blocks) userland
	* will have to compute a dedup-capable checksum itself.
	*/
	drrw->drr_checksumtype = ZIO_CHECKSUM_OFF;
	} else {
	drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
	if (zio_checksum_table[drrw->drr_checksumtype].ci_flags &
	ZCHECKSUM_FLAG_DEDUP)
	drrw->drr_flags \|= DRR_CHECKSUM_DEDUP;
	DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
	DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
	DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
	DDK_SET_CRYPT(&drrw->drr_key, BP_IS_PROTECTED(bp));
	drrw->drr_key.ddk_cksum = bp->blk_cksum;
	}

	if (dump_record(dscp, data, payload_size) != 0)
	return (SET_ERROR(EINTR));
	return (0);
	}

	static int
	dump_write_embedded(dmu_send_cookie_t *dscp, uint64_t object, uint64_t offset,
	int blksz, const blkptr_t *bp)
	{
	char buf[BPE_PAYLOAD_SIZE];
	struct drr_write_embedded *drrw =
	&(dscp->dsc_drr->drr_u.drr_write_embedded);

	if (dscp->dsc_pending_op != PENDING_NONE) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}

	ASSERT(BP_IS_EMBEDDED(bp));

	bzero(dscp->dsc_drr, sizeof (dmu_replay_record_t));
	dscp->dsc_drr->drr_type = DRR_WRITE_EMBEDDED;
	drrw->drr_object = object;
	drrw->drr_offset = offset;
	drrw->drr_length = blksz;
	drrw->drr_toguid = dscp->dsc_toguid;
	drrw->drr_compression = BP_GET_COMPRESS(bp);
	drrw->drr_etype = BPE_GET_ETYPE(bp);
	drrw->drr_lsize = BPE_GET_LSIZE(bp);
	drrw->drr_psize = BPE_GET_PSIZE(bp);

	decode_embedded_bp_compressed(bp, buf);

	if (dump_record(dscp, buf, P2ROUNDUP(drrw->drr_psize, 8)) != 0)
	return (SET_ERROR(EINTR));
	return (0);
	}

	static int
	dump_spill(dmu_send_cookie_t dscp, const blkptr_t bp, uint64_t object,
	void *data)
	{
	struct drr_spill *drrs = &(dscp->dsc_drr->drr_u.drr_spill);
	uint64_t blksz = BP_GET_LSIZE(bp);
	uint64_t payload_size = blksz;

	if (dscp->dsc_pending_op != PENDING_NONE) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}

	/* write a SPILL record */
	bzero(dscp->dsc_drr, sizeof (dmu_replay_record_t));
	dscp->dsc_drr->drr_type = DRR_SPILL;
	drrs->drr_object = object;
	drrs->drr_length = blksz;
	drrs->drr_toguid = dscp->dsc_toguid;

	/* See comment in dump_dnode() for full details */
	if (zfs_send_unmodified_spill_blocks &&
	(bp->blk_birth <= dscp->dsc_fromtxg)) {
	drrs->drr_flags \|= DRR_SPILL_UNMODIFIED;
	}

	/* handle raw send fields */
	if (dscp->dsc_featureflags & DMU_BACKUP_FEATURE_RAW) {
	ASSERT(BP_IS_PROTECTED(bp));

	if (BP_SHOULD_BYTESWAP(bp))
	drrs->drr_flags \|= DRR_RAW_BYTESWAP;
	drrs->drr_compressiontype = BP_GET_COMPRESS(bp);
	drrs->drr_compressed_size = BP_GET_PSIZE(bp);
	zio_crypt_decode_params_bp(bp, drrs->drr_salt, drrs->drr_iv);
	zio_crypt_decode_mac_bp(bp, drrs->drr_mac);
	payload_size = drrs->drr_compressed_size;
	}

	if (dump_record(dscp, data, payload_size) != 0)
	return (SET_ERROR(EINTR));
	return (0);
	}

	static int
	dump_freeobjects(dmu_send_cookie_t *dscp, uint64_t firstobj, uint64_t numobjs)
	{
	struct drr_freeobjects *drrfo = &(dscp->dsc_drr->drr_u.drr_freeobjects);
	uint64_t maxobj = DNODES_PER_BLOCK *
	(DMU_META_DNODE(dscp->dsc_os)->dn_maxblkid + 1);

	/*
	* ZoL < 0.7 does not handle large FREEOBJECTS records correctly,
	* leading to zfs recv never completing. to avoid this issue, don't
	* send FREEOBJECTS records for object IDs which cannot exist on the
	* receiving side.
	*/
	if (maxobj > 0) {
	if (maxobj <= firstobj)
	return (0);

	if (maxobj < firstobj + numobjs)
	numobjs = maxobj - firstobj;
	}

	/*
	* If there is a pending op, but it's not PENDING_FREEOBJECTS,
	* push it out, since free block aggregation can only be done for
	* blocks of the same type (i.e., DRR_FREE records can only be
	* aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
	* can only be aggregated with other DRR_FREEOBJECTS records).
	*/
	if (dscp->dsc_pending_op != PENDING_NONE &&
	dscp->dsc_pending_op != PENDING_FREEOBJECTS) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}

	if (dscp->dsc_pending_op == PENDING_FREEOBJECTS) {
	/*
	* See whether this free object array can be aggregated
	* with pending one
	*/
	if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
	drrfo->drr_numobjs += numobjs;
	return (0);
	} else {
	/* can't be aggregated. Push out pending record */
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}
	}

	/* write a FREEOBJECTS record */
	bzero(dscp->dsc_drr, sizeof (dmu_replay_record_t));
	dscp->dsc_drr->drr_type = DRR_FREEOBJECTS;
	drrfo->drr_firstobj = firstobj;
	drrfo->drr_numobjs = numobjs;
	drrfo->drr_toguid = dscp->dsc_toguid;

	dscp->dsc_pending_op = PENDING_FREEOBJECTS;

	return (0);
	}

	static int
	dump_dnode(dmu_send_cookie_t dscp, const blkptr_t bp, uint64_t object,
	dnode_phys_t *dnp)
	{
	struct drr_object *drro = &(dscp->dsc_drr->drr_u.drr_object);
	int bonuslen;

	if (object < dscp->dsc_resume_object) {
	/*
	* Note: when resuming, we will visit all the dnodes in
	* the block of dnodes that we are resuming from. In
	* this case it's unnecessary to send the dnodes prior to
	* the one we are resuming from. We should be at most one
	* block's worth of dnodes behind the resume point.
	*/
	ASSERT3U(dscp->dsc_resume_object - object, <,
	1 << (DNODE_BLOCK_SHIFT - DNODE_SHIFT));
	return (0);
	}

	if (dnp == NULL \|\| dnp->dn_type == DMU_OT_NONE)
	return (dump_freeobjects(dscp, object, 1));

	if (dscp->dsc_pending_op != PENDING_NONE) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}

	/* write an OBJECT record */
	bzero(dscp->dsc_drr, sizeof (dmu_replay_record_t));
	dscp->dsc_drr->drr_type = DRR_OBJECT;
	drro->drr_object = object;
	drro->drr_type = dnp->dn_type;
	drro->drr_bonustype = dnp->dn_bonustype;
	drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
	drro->drr_bonuslen = dnp->dn_bonuslen;
	drro->drr_dn_slots = dnp->dn_extra_slots + 1;
	drro->drr_checksumtype = dnp->dn_checksum;
	drro->drr_compress = dnp->dn_compress;
	drro->drr_toguid = dscp->dsc_toguid;

	if (!(dscp->dsc_featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) &&
	drro->drr_blksz > SPA_OLD_MAXBLOCKSIZE)
	drro->drr_blksz = SPA_OLD_MAXBLOCKSIZE;

	bonuslen = P2ROUNDUP(dnp->dn_bonuslen, 8);

	if ((dscp->dsc_featureflags & DMU_BACKUP_FEATURE_RAW)) {
	ASSERT(BP_IS_ENCRYPTED(bp));

	if (BP_SHOULD_BYTESWAP(bp))
	drro->drr_flags \|= DRR_RAW_BYTESWAP;

	/* needed for reconstructing dnp on recv side */
	drro->drr_maxblkid = dnp->dn_maxblkid;
	drro->drr_indblkshift = dnp->dn_indblkshift;
	drro->drr_nlevels = dnp->dn_nlevels;
	drro->drr_nblkptr = dnp->dn_nblkptr;

	/*
	* Since we encrypt the entire bonus area, the (raw) part
	* beyond the bonuslen is actually nonzero, so we need
	* to send it.
	*/
	if (bonuslen != 0) {
	drro->drr_raw_bonuslen = DN_MAX_BONUS_LEN(dnp);
	bonuslen = drro->drr_raw_bonuslen;
	}
	}

	/*
	* DRR_OBJECT_SPILL is set for every dnode which references a
	* spill block. This allows the receiving pool to definitively
	* determine when a spill block should be kept or freed.
	*/
	if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)
	drro->drr_flags \|= DRR_OBJECT_SPILL;

	if (dump_record(dscp, DN_BONUS(dnp), bonuslen) != 0)
	return (SET_ERROR(EINTR));

	/* Free anything past the end of the file. */
	if (dump_free(dscp, object, (dnp->dn_maxblkid + 1) *
	(dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), DMU_OBJECT_END) != 0)
	return (SET_ERROR(EINTR));

	/*
	* Send DRR_SPILL records for unmodified spill blocks. This is useful
	* because changing certain attributes of the object (e.g. blocksize)
	* can cause old versions of ZFS to incorrectly remove a spill block.
	* Including these records in the stream forces an up to date version
	* to always be written ensuring they're never lost. Current versions
	* of the code which understand the DRR_FLAG_SPILL_BLOCK feature can
	* ignore these unmodified spill blocks.
	*/
	if (zfs_send_unmodified_spill_blocks &&
	(dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) &&
	(DN_SPILL_BLKPTR(dnp)->blk_birth <= dscp->dsc_fromtxg)) {
	struct send_range record;
	blkptr_t *bp = DN_SPILL_BLKPTR(dnp);

	bzero(&record, sizeof (struct send_range));
	record.type = DATA;
	record.object = object;
	record.eos_marker = B_FALSE;
	record.start_blkid = DMU_SPILL_BLKID;
	record.end_blkid = record.start_blkid + 1;
	record.sru.data.bp = *bp;
	record.sru.data.obj_type = dnp->dn_type;
	record.sru.data.datablksz = BP_GET_LSIZE(bp);

	if (do_dump(dscp, &record) != 0)
	return (SET_ERROR(EINTR));
	}

	if (dscp->dsc_err != 0)
	return (SET_ERROR(EINTR));

	return (0);
	}

	static int
	dump_object_range(dmu_send_cookie_t dscp, const blkptr_t bp,
	uint64_t firstobj, uint64_t numslots)
	{
	struct drr_object_range *drror =
	&(dscp->dsc_drr->drr_u.drr_object_range);

	/* we only use this record type for raw sends */
	ASSERT(BP_IS_PROTECTED(bp));
	ASSERT(dscp->dsc_featureflags & DMU_BACKUP_FEATURE_RAW);
	ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF);
	ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_DNODE);
	ASSERT0(BP_GET_LEVEL(bp));

	if (dscp->dsc_pending_op != PENDING_NONE) {
	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	dscp->dsc_pending_op = PENDING_NONE;
	}

	bzero(dscp->dsc_drr, sizeof (dmu_replay_record_t));
	dscp->dsc_drr->drr_type = DRR_OBJECT_RANGE;
	drror->drr_firstobj = firstobj;
	drror->drr_numslots = numslots;
	drror->drr_toguid = dscp->dsc_toguid;
	if (BP_SHOULD_BYTESWAP(bp))
	drror->drr_flags \|= DRR_RAW_BYTESWAP;
	zio_crypt_decode_params_bp(bp, drror->drr_salt, drror->drr_iv);
	zio_crypt_decode_mac_bp(bp, drror->drr_mac);

	if (dump_record(dscp, NULL, 0) != 0)
	return (SET_ERROR(EINTR));
	return (0);
	}

	static boolean_t
	send_do_embed(const blkptr_t *bp, uint64_t featureflags)
	{
	if (!BP_IS_EMBEDDED(bp))
	return (B_FALSE);

	/*
	* Compression function must be legacy, or explicitly enabled.
	*/
	if ((BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_LEGACY_FUNCTIONS &&
	!(featureflags & DMU_BACKUP_FEATURE_LZ4)))
	return (B_FALSE);

	/*
	* If we have not set the ZSTD feature flag, we can't send ZSTD
	* compressed embedded blocks, as the receiver may not support them.
	*/
	if ((BP_GET_COMPRESS(bp) == ZIO_COMPRESS_ZSTD &&
	!(featureflags & DMU_BACKUP_FEATURE_ZSTD)))
	return (B_FALSE);

	/*
	* Embed type must be explicitly enabled.
	*/
	switch (BPE_GET_ETYPE(bp)) {
	case BP_EMBEDDED_TYPE_DATA:
	if (featureflags & DMU_BACKUP_FEATURE_EMBED_DATA)
	return (B_TRUE);
	break;
	default:
	return (B_FALSE);
	}
	return (B_FALSE);
	}

	/*
	* This function actually handles figuring out what kind of record needs to be
	* dumped, and calling the appropriate helper function. In most cases,
	* the data has already been read by send_reader_thread().
	*/
	static int
	do_dump(dmu_send_cookie_t dscp, struct send_range range)
	{
	int err = 0;
	switch (range->type) {
	case OBJECT:
	err = dump_dnode(dscp, &range->sru.object.bp, range->object,
	range->sru.object.dnp);
	return (err);
	case OBJECT_RANGE: {
	ASSERT3U(range->start_blkid + 1, ==, range->end_blkid);
	if (!(dscp->dsc_featureflags & DMU_BACKUP_FEATURE_RAW)) {
	return (0);
	}
	uint64_t epb = BP_GET_LSIZE(&range->sru.object_range.bp) >>
	DNODE_SHIFT;
	uint64_t firstobj = range->start_blkid * epb;
	err = dump_object_range(dscp, &range->sru.object_range.bp,
	firstobj, epb);
	break;
	}
	case REDACT: {
	struct srr *srrp = &range->sru.redact;
	err = dump_redact(dscp, range->object, range->start_blkid *
	srrp->datablksz, (range->end_blkid - range->start_blkid) *
	srrp->datablksz);
	return (err);
	}
	case DATA: {
	struct srd *srdp = &range->sru.data;
	blkptr_t *bp = &srdp->bp;
	spa_t *spa =
	dmu_objset_spa(dscp->dsc_os);

	ASSERT3U(srdp->datablksz, ==, BP_GET_LSIZE(bp));
	ASSERT3U(range->start_blkid + 1, ==, range->end_blkid);
	if (BP_GET_TYPE(bp) == DMU_OT_SA) {
	arc_flags_t aflags = ARC_FLAG_WAIT;
	enum zio_flag zioflags = ZIO_FLAG_CANFAIL;

	if (dscp->dsc_featureflags & DMU_BACKUP_FEATURE_RAW) {
	ASSERT(BP_IS_PROTECTED(bp));
	zioflags \|= ZIO_FLAG_RAW;
	}

	zbookmark_phys_t zb;
	ASSERT3U(range->start_blkid, ==, DMU_SPILL_BLKID);
	zb.zb_objset = dmu_objset_id(dscp->dsc_os);
	zb.zb_object = range->object;
	zb.zb_level = 0;
	zb.zb_blkid = range->start_blkid;

	arc_buf_t *abuf = NULL;
	if (!dscp->dsc_dso->dso_dryrun && arc_read(NULL, spa,
	bp, arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
	zioflags, &aflags, &zb) != 0)
	return (SET_ERROR(EIO));

	err = dump_spill(dscp, bp, zb.zb_object,
	(abuf == NULL ? NULL : abuf->b_data));
	if (abuf != NULL)
	arc_buf_destroy(abuf, &abuf);
	return (err);
	}
	if (send_do_embed(bp, dscp->dsc_featureflags)) {
	err = dump_write_embedded(dscp, range->object,
	range->start_blkid * srdp->datablksz,
	srdp->datablksz, bp);
	return (err);
	}
	ASSERT(range->object > dscp->dsc_resume_object \|\|
	(range->object == dscp->dsc_resume_object &&
	range->start_blkid * srdp->datablksz >=
	dscp->dsc_resume_offset));
	/* it's a level-0 block of a regular object */

	mutex_enter(&srdp->lock);
	while (srdp->io_outstanding)
	cv_wait(&srdp->cv, &srdp->lock);
	err = srdp->io_err;
	mutex_exit(&srdp->lock);

	if (err != 0) {
	if (zfs_send_corrupt_data &&
	!dscp->dsc_dso->dso_dryrun) {
	/*
	* Send a block filled with 0x"zfs badd bloc"
	*/
	srdp->abuf = arc_alloc_buf(spa, &srdp->abuf,
	ARC_BUFC_DATA, srdp->datablksz);
	uint64_t *ptr;
	for (ptr = srdp->abuf->b_data;
	(char )ptr < (char )srdp->abuf->b_data +
	srdp->datablksz; ptr++)
	*ptr = 0x2f5baddb10cULL;
	} else {
	return (SET_ERROR(EIO));
	}
	}

	ASSERT(dscp->dsc_dso->dso_dryrun \|\|
	srdp->abuf != NULL \|\| srdp->abd != NULL);

	uint64_t offset = range->start_blkid * srdp->datablksz;

	char *data = NULL;
	if (srdp->abd != NULL) {
	data = abd_to_buf(srdp->abd);
	ASSERT3P(srdp->abuf, ==, NULL);
	} else if (srdp->abuf != NULL) {
	data = srdp->abuf->b_data;
	}

	/*
	* If we have large blocks stored on disk but the send flags
	* don't allow us to send large blocks, we split the data from
	* the arc buf into chunks.
	*/
	if (srdp->datablksz > SPA_OLD_MAXBLOCKSIZE &&
	!(dscp->dsc_featureflags &
	DMU_BACKUP_FEATURE_LARGE_BLOCKS)) {
	while (srdp->datablksz > 0 && err == 0) {
	int n = MIN(srdp->datablksz,
	SPA_OLD_MAXBLOCKSIZE);
	err = dmu_dump_write(dscp, srdp->obj_type,
	range->object, offset, n, n, NULL, data);
	offset += n;
	/*
	* When doing dry run, data==NULL is used as a
	* sentinel value by
	* dmu_dump_write()->dump_record().
	*/
	if (data != NULL)
	data += n;
	srdp->datablksz -= n;
	}
	} else {
	err = dmu_dump_write(dscp, srdp->obj_type,
	range->object, offset,
	srdp->datablksz, srdp->datasz, bp, data);
	}
	return (err);
	}
	case HOLE: {
	struct srh *srhp = &range->sru.hole;
	if (range->object == DMU_META_DNODE_OBJECT) {
	uint32_t span = srhp->datablksz >> DNODE_SHIFT;
	uint64_t first_obj = range->start_blkid * span;
	uint64_t numobj = range->end_blkid * span - first_obj;
	return (dump_freeobjects(dscp, first_obj, numobj));
	}
	uint64_t offset = 0;

	/*
	* If this multiply overflows, we don't need to send this block.
	* Even if it has a birth time, it can never not be a hole, so
	* we don't need to send records for it.
	*/
	if (!overflow_multiply(range->start_blkid, srhp->datablksz,
	&offset)) {
	return (0);
	}
	uint64_t len = 0;

	if (!overflow_multiply(range->end_blkid, srhp->datablksz, &len))
	len = UINT64_MAX;
	len = len - offset;
	return (dump_free(dscp, range->object, offset, len));
	}
	default:
	panic("Invalid range type in do_dump: %d", range->type);
	}
	return (err);
	}

	static struct send_range *
	range_alloc(enum type type, uint64_t object, uint64_t start_blkid,
	uint64_t end_blkid, boolean_t eos)
	{
	struct send_range range = kmem_alloc(sizeof (range), KM_SLEEP);
	range->type = type;
	range->object = object;
	range->start_blkid = start_blkid;
	range->end_blkid = end_blkid;
	range->eos_marker = eos;
	if (type == DATA) {
	range->sru.data.abd = NULL;
	range->sru.data.abuf = NULL;
	mutex_init(&range->sru.data.lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&range->sru.data.cv, NULL, CV_DEFAULT, NULL);
	range->sru.data.io_outstanding = 0;
	range->sru.data.io_err = 0;
	}
	return (range);
	}

	/*
	* This is the callback function to traverse_dataset that acts as a worker
	* thread for dmu_send_impl.
	*/
	/ARGSUSED/
	static int
	send_cb(spa_t spa, zilog_t zilog, const blkptr_t *bp,
	const zbookmark_phys_t zb, const struct dnode_phys dnp, void *arg)
	{
	struct send_thread_arg *sta = arg;
	struct send_range *record;

	ASSERT(zb->zb_object == DMU_META_DNODE_OBJECT \|\|
	zb->zb_object >= sta->resume.zb_object);

	/*
	* All bps of an encrypted os should have the encryption bit set.
	* If this is not true it indicates tampering and we report an error.
	*/
	if (sta->os->os_encrypted &&
	!BP_IS_HOLE(bp) && !BP_USES_CRYPT(bp)) {
	spa_log_error(spa, zb);
	zfs_panic_recover("unencrypted block in encrypted "
	"object set %llu", dmu_objset_id(sta->os));
	return (SET_ERROR(EIO));
	}

	if (sta->cancel)
	return (SET_ERROR(EINTR));
	if (zb->zb_object != DMU_META_DNODE_OBJECT &&
	DMU_OBJECT_IS_SPECIAL(zb->zb_object))
	return (0);
	atomic_inc_64(sta->num_blocks_visited);

	if (zb->zb_level == ZB_DNODE_LEVEL) {
	if (zb->zb_object == DMU_META_DNODE_OBJECT)
	return (0);
	record = range_alloc(OBJECT, zb->zb_object, 0, 0, B_FALSE);
	record->sru.object.bp = *bp;
	size_t size = sizeof (dnp) (dnp->dn_extra_slots + 1);
	record->sru.object.dnp = kmem_alloc(size, KM_SLEEP);
	bcopy(dnp, record->sru.object.dnp, size);
	bqueue_enqueue(&sta->q, record, sizeof (*record));
	return (0);
	}
	if (zb->zb_level == 0 && zb->zb_object == DMU_META_DNODE_OBJECT &&
	!BP_IS_HOLE(bp)) {
	record = range_alloc(OBJECT_RANGE, 0, zb->zb_blkid,
	zb->zb_blkid + 1, B_FALSE);
	record->sru.object_range.bp = *bp;
	bqueue_enqueue(&sta->q, record, sizeof (*record));
	return (0);
	}
	if (zb->zb_level < 0 \|\| (zb->zb_level > 0 && !BP_IS_HOLE(bp)))
	return (0);
	if (zb->zb_object == DMU_META_DNODE_OBJECT && !BP_IS_HOLE(bp))
	return (0);

	uint64_t span = bp_span_in_blocks(dnp->dn_indblkshift, zb->zb_level);
	uint64_t start;

	/*
	* If this multiply overflows, we don't need to send this block.
	* Even if it has a birth time, it can never not be a hole, so
	* we don't need to send records for it.
	*/
	if (!overflow_multiply(span, zb->zb_blkid, &start) \|\| (!(zb->zb_blkid ==
	DMU_SPILL_BLKID \|\| DMU_OT_IS_METADATA(dnp->dn_type)) &&
	span * zb->zb_blkid > dnp->dn_maxblkid)) {
	ASSERT(BP_IS_HOLE(bp));
	return (0);
	}

	if (zb->zb_blkid == DMU_SPILL_BLKID)
	ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_SA);

	enum type record_type = DATA;
	if (BP_IS_HOLE(bp))
	record_type = HOLE;
	else if (BP_IS_REDACTED(bp))
	record_type = REDACT;
	else
	record_type = DATA;

	record = range_alloc(record_type, zb->zb_object, start,
	(start + span < start ? 0 : start + span), B_FALSE);

	uint64_t datablksz = (zb->zb_blkid == DMU_SPILL_BLKID ?
	BP_GET_LSIZE(bp) : dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);

	if (BP_IS_HOLE(bp)) {
	record->sru.hole.datablksz = datablksz;
	} else if (BP_IS_REDACTED(bp)) {
	record->sru.redact.datablksz = datablksz;
	} else {
	record->sru.data.datablksz = datablksz;
	record->sru.data.obj_type = dnp->dn_type;
	record->sru.data.bp = *bp;
	}

	bqueue_enqueue(&sta->q, record, sizeof (*record));
	return (0);
	}

	struct redact_list_cb_arg {
	uint64_t *num_blocks_visited;
	bqueue_t *q;
	boolean_t *cancel;
	boolean_t mark_redact;
	};

	static int
	redact_list_cb(redact_block_phys_t rb, void arg)
	{
	struct redact_list_cb_arg *rlcap = arg;

	atomic_inc_64(rlcap->num_blocks_visited);
	if (*rlcap->cancel)
	return (-1);

	struct send_range *data = range_alloc(REDACT, rb->rbp_object,
	rb->rbp_blkid, rb->rbp_blkid + redact_block_get_count(rb), B_FALSE);
	ASSERT3U(data->end_blkid, >, rb->rbp_blkid);
	if (rlcap->mark_redact) {
	data->type = REDACT;
	data->sru.redact.datablksz = redact_block_get_size(rb);
	} else {
	data->type = PREVIOUSLY_REDACTED;
	}
	bqueue_enqueue(rlcap->q, data, sizeof (*data));

	return (0);
	}

	/*
	* This function kicks off the traverse_dataset. It also handles setting the
	* error code of the thread in case something goes wrong, and pushes the End of
	* Stream record when the traverse_dataset call has finished.
	*/
	static void
	send_traverse_thread(void *arg)
	{
	struct send_thread_arg *st_arg = arg;
	int err = 0;
	struct send_range *data;
	fstrans_cookie_t cookie = spl_fstrans_mark();

	err = traverse_dataset_resume(st_arg->os->os_dsl_dataset,
	st_arg->fromtxg, &st_arg->resume,
	st_arg->flags, send_cb, st_arg);

	if (err != EINTR)
	st_arg->error_code = err;
	data = range_alloc(DATA, 0, 0, 0, B_TRUE);
	bqueue_enqueue_flush(&st_arg->q, data, sizeof (*data));
	spl_fstrans_unmark(cookie);
	thread_exit();
	}

	/*
	* Utility function that causes End of Stream records to compare after of all
	* others, so that other threads' comparison logic can stay simple.
	*/
	static int __attribute__((unused))
	send_range_after(const struct send_range from, const struct send_range to)
	{
	if (from->eos_marker == B_TRUE)
	return (1);
	if (to->eos_marker == B_TRUE)
	return (-1);

	uint64_t from_obj = from->object;
	uint64_t from_end_obj = from->object + 1;
	uint64_t to_obj = to->object;
	uint64_t to_end_obj = to->object + 1;
	if (from_obj == 0) {
	ASSERT(from->type == HOLE \|\| from->type == OBJECT_RANGE);
	from_obj = from->start_blkid << DNODES_PER_BLOCK_SHIFT;
	from_end_obj = from->end_blkid << DNODES_PER_BLOCK_SHIFT;
	}
	if (to_obj == 0) {
	ASSERT(to->type == HOLE \|\| to->type == OBJECT_RANGE);
	to_obj = to->start_blkid << DNODES_PER_BLOCK_SHIFT;
	to_end_obj = to->end_blkid << DNODES_PER_BLOCK_SHIFT;
	}

	if (from_end_obj <= to_obj)
	return (-1);
	if (from_obj >= to_end_obj)
	return (1);
	int64_t cmp = TREE_CMP(to->type == OBJECT_RANGE, from->type ==
	OBJECT_RANGE);
	if (unlikely(cmp))
	return (cmp);
	cmp = TREE_CMP(to->type == OBJECT, from->type == OBJECT);
	if (unlikely(cmp))
	return (cmp);
	if (from->end_blkid <= to->start_blkid)
	return (-1);
	if (from->start_blkid >= to->end_blkid)
	return (1);
	return (0);
	}

	/*
	* Pop the new data off the queue, check that the records we receive are in
	* the right order, but do not free the old data. This is used so that the
	* records can be sent on to the main thread without copying the data.
	*/
	static struct send_range *
	get_next_range_nofree(bqueue_t bq, struct send_range prev)
	{
	struct send_range *next = bqueue_dequeue(bq);
	ASSERT3S(send_range_after(prev, next), ==, -1);
	return (next);
	}

	/*
	* Pop the new data off the queue, check that the records we receive are in
	* the right order, and free the old data.
	*/
	static struct send_range *
	get_next_range(bqueue_t bq, struct send_range prev)
	{
	struct send_range *next = get_next_range_nofree(bq, prev);
	range_free(prev);
	return (next);
	}

	static void
	redact_list_thread(void *arg)
	{
	struct redact_list_thread_arg *rlt_arg = arg;
	struct send_range *record;
	fstrans_cookie_t cookie = spl_fstrans_mark();
	if (rlt_arg->rl != NULL) {
	struct redact_list_cb_arg rlcba = {0};
	rlcba.cancel = &rlt_arg->cancel;
	rlcba.q = &rlt_arg->q;
	rlcba.num_blocks_visited = rlt_arg->num_blocks_visited;
	rlcba.mark_redact = rlt_arg->mark_redact;
	int err = dsl_redaction_list_traverse(rlt_arg->rl,
	&rlt_arg->resume, redact_list_cb, &rlcba);
	if (err != EINTR)
	rlt_arg->error_code = err;
	}
	record = range_alloc(DATA, 0, 0, 0, B_TRUE);
	bqueue_enqueue_flush(&rlt_arg->q, record, sizeof (*record));
	spl_fstrans_unmark(cookie);

	thread_exit();
	}

	/*
	* Compare the start point of the two provided ranges. End of stream ranges
	* compare last, objects compare before any data or hole inside that object and
	* multi-object holes that start at the same object.
	*/
	static int
	send_range_start_compare(struct send_range r1, struct send_range r2)
	{
	uint64_t r1_objequiv = r1->object;
	uint64_t r1_l0equiv = r1->start_blkid;
	uint64_t r2_objequiv = r2->object;
	uint64_t r2_l0equiv = r2->start_blkid;
	int64_t cmp = TREE_CMP(r1->eos_marker, r2->eos_marker);
	if (unlikely(cmp))
	return (cmp);
	if (r1->object == 0) {
	r1_objequiv = r1->start_blkid * DNODES_PER_BLOCK;
	r1_l0equiv = 0;
	}
	if (r2->object == 0) {
	r2_objequiv = r2->start_blkid * DNODES_PER_BLOCK;
	r2_l0equiv = 0;
	}

	cmp = TREE_CMP(r1_objequiv, r2_objequiv);
	if (likely(cmp))
	return (cmp);
	cmp = TREE_CMP(r2->type == OBJECT_RANGE, r1->type == OBJECT_RANGE);
	if (unlikely(cmp))
	return (cmp);
	cmp = TREE_CMP(r2->type == OBJECT, r1->type == OBJECT);
	if (unlikely(cmp))
	return (cmp);

	return (TREE_CMP(r1_l0equiv, r2_l0equiv));
	}

	enum q_idx {
	REDACT_IDX = 0,
	TO_IDX,
	FROM_IDX,
	NUM_THREADS
	};

	/*
	* This function returns the next range the send_merge_thread should operate on.
	* The inputs are two arrays; the first one stores the range at the front of the
	* queues stored in the second one. The ranges are sorted in descending
	* priority order; the metadata from earlier ranges overrules metadata from
	* later ranges. out_mask is used to return which threads the ranges came from;
	* bit i is set if ranges[i] started at the same place as the returned range.
	*
	* This code is not hardcoded to compare a specific number of threads; it could
	* be used with any number, just by changing the q_idx enum.
	*
	* The "next range" is the one with the earliest start; if two starts are equal,
	* the highest-priority range is the next to operate on. If a higher-priority
	* range starts in the middle of the first range, then the first range will be
	* truncated to end where the higher-priority range starts, and we will operate
	* on that one next time. In this way, we make sure that each block covered by
	* some range gets covered by a returned range, and each block covered is
	* returned using the metadata of the highest-priority range it appears in.
	*
	* For example, if the three ranges at the front of the queues were [2,4),
	* [3,5), and [1,3), then the ranges returned would be [1,2) with the metadata
	* from the third range, [2,4) with the metadata from the first range, and then
	* [4,5) with the metadata from the second.
	*/
	static struct send_range *
	find_next_range(struct send_range ranges, bqueue_t qs, uint64_t *out_mask)
	{
	int idx = 0; // index of the range with the earliest start
	int i;
	uint64_t bmask = 0;
	for (i = 1; i < NUM_THREADS; i++) {
	if (send_range_start_compare(ranges[i], ranges[idx]) < 0)
	idx = i;
	}
	if (ranges[idx]->eos_marker) {
	struct send_range *ret = range_alloc(DATA, 0, 0, 0, B_TRUE);
	*out_mask = 0;
	return (ret);
	}
	/*
	* Find all the ranges that start at that same point.
	*/
	for (i = 0; i < NUM_THREADS; i++) {
	if (send_range_start_compare(ranges[i], ranges[idx]) == 0)
	bmask \|= 1 << i;
	}
	*out_mask = bmask;
	/*
	* OBJECT_RANGE records only come from the TO thread, and should always
	* be treated as overlapping with nothing and sent on immediately. They
	* are only used in raw sends, and are never redacted.
	*/
	if (ranges[idx]->type == OBJECT_RANGE) {
	ASSERT3U(idx, ==, TO_IDX);
	ASSERT3U(*out_mask, ==, 1 << TO_IDX);
	struct send_range *ret = ranges[idx];
	ranges[idx] = get_next_range_nofree(qs[idx], ranges[idx]);
	return (ret);
	}
	/*
	* Find the first start or end point after the start of the first range.
	*/
	uint64_t first_change = ranges[idx]->end_blkid;
	for (i = 0; i < NUM_THREADS; i++) {
	if (i == idx \|\| ranges[i]->eos_marker \|\|
	ranges[i]->object > ranges[idx]->object \|\|
	ranges[i]->object == DMU_META_DNODE_OBJECT)
	continue;
	ASSERT3U(ranges[i]->object, ==, ranges[idx]->object);
	if (first_change > ranges[i]->start_blkid &&
	(bmask & (1 << i)) == 0)
	first_change = ranges[i]->start_blkid;
	else if (first_change > ranges[i]->end_blkid)
	first_change = ranges[i]->end_blkid;
	}
	/*
	* Update all ranges to no longer overlap with the range we're
	* returning. All such ranges must start at the same place as the range
	* being returned, and end at or after first_change. Thus we update
	* their start to first_change. If that makes them size 0, then free
	* them and pull a new range from that thread.
	*/
	for (i = 0; i < NUM_THREADS; i++) {
	if (i == idx \|\| (bmask & (1 << i)) == 0)
	continue;
	ASSERT3U(first_change, >, ranges[i]->start_blkid);
	ranges[i]->start_blkid = first_change;
	ASSERT3U(ranges[i]->start_blkid, <=, ranges[i]->end_blkid);
	if (ranges[i]->start_blkid == ranges[i]->end_blkid)
	ranges[i] = get_next_range(qs[i], ranges[i]);
	}
	/*
	* Short-circuit the simple case; if the range doesn't overlap with
	* anything else, or it only overlaps with things that start at the same
	* place and are longer, send it on.
	*/
	if (first_change == ranges[idx]->end_blkid) {
	struct send_range *ret = ranges[idx];
	ranges[idx] = get_next_range_nofree(qs[idx], ranges[idx]);
	return (ret);
	}

	/*
	* Otherwise, return a truncated copy of ranges[idx] and move the start
	* of ranges[idx] back to first_change.
	*/
	struct send_range ret = kmem_alloc(sizeof (ret), KM_SLEEP);
	ret = ranges[idx];
	ret->end_blkid = first_change;
	ranges[idx]->start_blkid = first_change;
	return (ret);
	}

	#define FROM_AND_REDACT_BITS ((1 << REDACT_IDX) \| (1 << FROM_IDX))

	/*
	* Merge the results from the from thread and the to thread, and then hand the
	* records off to send_prefetch_thread to prefetch them. If this is not a
	* send from a redaction bookmark, the from thread will push an end of stream
	* record and stop, and we'll just send everything that was changed in the
	* to_ds since the ancestor's creation txg. If it is, then since
	* traverse_dataset has a canonical order, we can compare each change as
	* they're pulled off the queues. That will give us a stream that is
	* appropriately sorted, and covers all records. In addition, we pull the
	* data from the redact_list_thread and use that to determine which blocks
	* should be redacted.
	*/
	static void
	send_merge_thread(void *arg)
	{
	struct send_merge_thread_arg *smt_arg = arg;
	struct send_range *front_ranges[NUM_THREADS];
	bqueue_t *queues[NUM_THREADS];
	int err = 0;
	fstrans_cookie_t cookie = spl_fstrans_mark();

	if (smt_arg->redact_arg == NULL) {
	front_ranges[REDACT_IDX] =
	kmem_zalloc(sizeof (struct send_range), KM_SLEEP);
	front_ranges[REDACT_IDX]->eos_marker = B_TRUE;
	front_ranges[REDACT_IDX]->type = REDACT;
	queues[REDACT_IDX] = NULL;
	} else {
	front_ranges[REDACT_IDX] =
	bqueue_dequeue(&smt_arg->redact_arg->q);
	queues[REDACT_IDX] = &smt_arg->redact_arg->q;
	}
	front_ranges[TO_IDX] = bqueue_dequeue(&smt_arg->to_arg->q);
	queues[TO_IDX] = &smt_arg->to_arg->q;
	front_ranges[FROM_IDX] = bqueue_dequeue(&smt_arg->from_arg->q);
	queues[FROM_IDX] = &smt_arg->from_arg->q;
	uint64_t mask = 0;
	struct send_range *range;
	for (range = find_next_range(front_ranges, queues, &mask);
	!range->eos_marker && err == 0 && !smt_arg->cancel;
	range = find_next_range(front_ranges, queues, &mask)) {
	/*
	* If the range in question was in both the from redact bookmark
	* and the bookmark we're using to redact, then don't send it.
	* It's already redacted on the receiving system, so a redaction
	* record would be redundant.
	*/
	if ((mask & FROM_AND_REDACT_BITS) == FROM_AND_REDACT_BITS) {
	ASSERT3U(range->type, ==, REDACT);
	range_free(range);
	continue;
	}
	bqueue_enqueue(&smt_arg->q, range, sizeof (*range));

	if (smt_arg->to_arg->error_code != 0) {
	err = smt_arg->to_arg->error_code;
	} else if (smt_arg->from_arg->error_code != 0) {
	err = smt_arg->from_arg->error_code;
	} else if (smt_arg->redact_arg != NULL &&
	smt_arg->redact_arg->error_code != 0) {
	err = smt_arg->redact_arg->error_code;
	}
	}
	if (smt_arg->cancel && err == 0)
	err = SET_ERROR(EINTR);
	smt_arg->error = err;
	if (smt_arg->error != 0) {
	smt_arg->to_arg->cancel = B_TRUE;
	smt_arg->from_arg->cancel = B_TRUE;
	if (smt_arg->redact_arg != NULL)
	smt_arg->redact_arg->cancel = B_TRUE;
	}
	for (int i = 0; i < NUM_THREADS; i++) {
	while (!front_ranges[i]->eos_marker) {
	front_ranges[i] = get_next_range(queues[i],
	front_ranges[i]);
	}
	range_free(front_ranges[i]);
	}
	if (range == NULL)
	range = kmem_zalloc(sizeof (*range), KM_SLEEP);
	range->eos_marker = B_TRUE;
	bqueue_enqueue_flush(&smt_arg->q, range, 1);
	spl_fstrans_unmark(cookie);
	thread_exit();
	}

	struct send_reader_thread_arg {
	struct send_merge_thread_arg *smta;
	bqueue_t q;
	boolean_t cancel;
	boolean_t issue_reads;
	uint64_t featureflags;
	int error;
	};

	static void
	dmu_send_read_done(zio_t *zio)
	{
	struct send_range *range = zio->io_private;

	mutex_enter(&range->sru.data.lock);
	if (zio->io_error != 0) {
	abd_free(range->sru.data.abd);
	range->sru.data.abd = NULL;
	range->sru.data.io_err = zio->io_error;
	}

	ASSERT(range->sru.data.io_outstanding);
	range->sru.data.io_outstanding = B_FALSE;
	cv_broadcast(&range->sru.data.cv);
	mutex_exit(&range->sru.data.lock);
	}

	static void
	issue_data_read(struct send_reader_thread_arg srta, struct send_range range)
	{
	struct srd *srdp = &range->sru.data;
	blkptr_t *bp = &srdp->bp;
	objset_t *os = srta->smta->os;

	ASSERT3U(range->type, ==, DATA);
	ASSERT3U(range->start_blkid + 1, ==, range->end_blkid);
	/*
	* If we have large blocks stored on disk but
	* the send flags don't allow us to send large
	* blocks, we split the data from the arc buf
	* into chunks.
	*/
	boolean_t split_large_blocks =
	srdp->datablksz > SPA_OLD_MAXBLOCKSIZE &&
	!(srta->featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS);
	/*
	* We should only request compressed data from the ARC if all
	* the following are true:
	* - stream compression was requested
	* - we aren't splitting large blocks into smaller chunks
	* - the data won't need to be byteswapped before sending
	* - this isn't an embedded block
	* - this isn't metadata (if receiving on a different endian
	* system it can be byteswapped more easily)
	*/
	boolean_t request_compressed =
	(srta->featureflags & DMU_BACKUP_FEATURE_COMPRESSED) &&
	!split_large_blocks && !BP_SHOULD_BYTESWAP(bp) &&
	!BP_IS_EMBEDDED(bp) && !DMU_OT_IS_METADATA(BP_GET_TYPE(bp));

	enum zio_flag zioflags = ZIO_FLAG_CANFAIL;

	if (srta->featureflags & DMU_BACKUP_FEATURE_RAW)
	zioflags \|= ZIO_FLAG_RAW;
	else if (request_compressed)
	zioflags \|= ZIO_FLAG_RAW_COMPRESS;

	srdp->datasz = (zioflags & ZIO_FLAG_RAW_COMPRESS) ?
	BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp);

	if (!srta->issue_reads)
	return;
	if (BP_IS_REDACTED(bp))
	return;
	if (send_do_embed(bp, srta->featureflags))
	return;

	zbookmark_phys_t zb = {
	.zb_objset = dmu_objset_id(os),
	.zb_object = range->object,
	.zb_level = 0,
	.zb_blkid = range->start_blkid,
	};

	arc_flags_t aflags = ARC_FLAG_CACHED_ONLY;

	int arc_err = arc_read(NULL, os->os_spa, bp,
	arc_getbuf_func, &srdp->abuf, ZIO_PRIORITY_ASYNC_READ,
	zioflags, &aflags, &zb);
	/*
	* If the data is not already cached in the ARC, we read directly
	* from zio. This avoids the performance overhead of adding a new
	* entry to the ARC, and we also avoid polluting the ARC cache with
	* data that is not likely to be used in the future.
	*/
	if (arc_err != 0) {
	srdp->abd = abd_alloc_linear(srdp->datasz, B_FALSE);
	srdp->io_outstanding = B_TRUE;
	zio_nowait(zio_read(NULL, os->os_spa, bp, srdp->abd,
	srdp->datasz, dmu_send_read_done, range,
	ZIO_PRIORITY_ASYNC_READ, zioflags, &zb));
	}
	}

	/*
	* Create a new record with the given values.
	*/
	static void
	enqueue_range(struct send_reader_thread_arg srta, bqueue_t q, dnode_t *dn,
	uint64_t blkid, uint64_t count, const blkptr_t *bp, uint32_t datablksz)
	{
	enum type range_type = (bp == NULL \|\| BP_IS_HOLE(bp) ? HOLE :
	(BP_IS_REDACTED(bp) ? REDACT : DATA));

	struct send_range *range = range_alloc(range_type, dn->dn_object,
	blkid, blkid + count, B_FALSE);

	if (blkid == DMU_SPILL_BLKID)
	ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_SA);

	switch (range_type) {
	case HOLE:
	range->sru.hole.datablksz = datablksz;
	break;
	case DATA:
	ASSERT3U(count, ==, 1);
	range->sru.data.datablksz = datablksz;
	range->sru.data.obj_type = dn->dn_type;
	range->sru.data.bp = *bp;
	issue_data_read(srta, range);
	break;
	case REDACT:
	range->sru.redact.datablksz = datablksz;
	break;
	default:
	break;
	}
	bqueue_enqueue(q, range, datablksz);
	}

	/*
	* This thread is responsible for two things: First, it retrieves the correct
	* blkptr in the to ds if we need to send the data because of something from
	* the from thread. As a result of this, we're the first ones to discover that
	* some indirect blocks can be discarded because they're not holes. Second,
	* it issues prefetches for the data we need to send.
	*/
	static void
	send_reader_thread(void *arg)
	{
	struct send_reader_thread_arg *srta = arg;
	struct send_merge_thread_arg *smta = srta->smta;
	bqueue_t *inq = &smta->q;
	bqueue_t *outq = &srta->q;
	objset_t *os = smta->os;
	fstrans_cookie_t cookie = spl_fstrans_mark();
	struct send_range *range = bqueue_dequeue(inq);
	int err = 0;

	/*
	* If the record we're analyzing is from a redaction bookmark from the
	* fromds, then we need to know whether or not it exists in the tods so
	* we know whether to create records for it or not. If it does, we need
	* the datablksz so we can generate an appropriate record for it.
	* Finally, if it isn't redacted, we need the blkptr so that we can send
	* a WRITE record containing the actual data.
	*/
	uint64_t last_obj = UINT64_MAX;
	uint64_t last_obj_exists = B_TRUE;
	while (!range->eos_marker && !srta->cancel && smta->error == 0 &&
	err == 0) {
	switch (range->type) {
	case DATA:
	issue_data_read(srta, range);
	bqueue_enqueue(outq, range, range->sru.data.datablksz);
	range = get_next_range_nofree(inq, range);
	break;
	case HOLE:
	case OBJECT:
	case OBJECT_RANGE:
	case REDACT: // Redacted blocks must exist
	bqueue_enqueue(outq, range, sizeof (*range));
	range = get_next_range_nofree(inq, range);
	break;
	case PREVIOUSLY_REDACTED: {
	/*
	* This entry came from the "from bookmark" when
	* sending from a bookmark that has a redaction
	* list. We need to check if this object/blkid
	* exists in the target ("to") dataset, and if
	* not then we drop this entry. We also need
	* to fill in the block pointer so that we know
	* what to prefetch.
	*
	* To accomplish the above, we first cache whether or
	* not the last object we examined exists. If it
	* doesn't, we can drop this record. If it does, we hold
	* the dnode and use it to call dbuf_dnode_findbp. We do
	* this instead of dbuf_bookmark_findbp because we will
	* often operate on large ranges, and holding the dnode
	* once is more efficient.
	*/
	boolean_t object_exists = B_TRUE;
	/*
	* If the data is redacted, we only care if it exists,
	* so that we don't send records for objects that have
	* been deleted.
	*/
	dnode_t *dn;
	if (range->object == last_obj && !last_obj_exists) {
	/*
	* If we're still examining the same object as
	* previously, and it doesn't exist, we don't
	* need to call dbuf_bookmark_findbp.
	*/
	object_exists = B_FALSE;
	} else {
	err = dnode_hold(os, range->object, FTAG, &dn);
	if (err == ENOENT) {
	object_exists = B_FALSE;
	err = 0;
	}
	last_obj = range->object;
	last_obj_exists = object_exists;
	}

	if (err != 0) {
	break;
	} else if (!object_exists) {
	/*
	* The block was modified, but doesn't
	* exist in the to dataset; if it was
	* deleted in the to dataset, then we'll
	* visit the hole bp for it at some point.
	*/
	range = get_next_range(inq, range);
	continue;
	}
	uint64_t file_max =
	(dn->dn_maxblkid < range->end_blkid ?
	dn->dn_maxblkid : range->end_blkid);
	/*
	* The object exists, so we need to try to find the
	* blkptr for each block in the range we're processing.
	*/
	rw_enter(&dn->dn_struct_rwlock, RW_READER);
	for (uint64_t blkid = range->start_blkid;
	blkid < file_max; blkid++) {
	blkptr_t bp;
	uint32_t datablksz =
	dn->dn_phys->dn_datablkszsec <<
	SPA_MINBLOCKSHIFT;
	uint64_t offset = blkid * datablksz;
	/*
	* This call finds the next non-hole block in
	* the object. This is to prevent a
	* performance problem where we're unredacting
	* a large hole. Using dnode_next_offset to
	* skip over the large hole avoids iterating
	* over every block in it.
	*/
	err = dnode_next_offset(dn, DNODE_FIND_HAVELOCK,
	&offset, 1, 1, 0);
	if (err == ESRCH) {
	offset = UINT64_MAX;
	err = 0;
	} else if (err != 0) {
	break;
	}
	if (offset != blkid * datablksz) {
	/*
	* if there is a hole from here
	* (blkid) to offset
	*/
	offset = MIN(offset, file_max *
	datablksz);
	uint64_t nblks = (offset / datablksz) -
	blkid;
	enqueue_range(srta, outq, dn, blkid,
	nblks, NULL, datablksz);
	blkid += nblks;
	}
	if (blkid >= file_max)
	break;
	err = dbuf_dnode_findbp(dn, 0, blkid, &bp,
	NULL, NULL);
	if (err != 0)
	break;
	ASSERT(!BP_IS_HOLE(&bp));
	enqueue_range(srta, outq, dn, blkid, 1, &bp,
	datablksz);
	}
	rw_exit(&dn->dn_struct_rwlock);
	dnode_rele(dn, FTAG);
	range = get_next_range(inq, range);
	}
	}
	}
	if (srta->cancel \|\| err != 0) {
	smta->cancel = B_TRUE;
	srta->error = err;
	} else if (smta->error != 0) {
	srta->error = smta->error;
	}
	while (!range->eos_marker)
	range = get_next_range(inq, range);

	bqueue_enqueue_flush(outq, range, 1);
	spl_fstrans_unmark(cookie);
	thread_exit();
	}

	#define NUM_SNAPS_NOT_REDACTED UINT64_MAX

	struct dmu_send_params {
	/* Pool args */
	void *tag; // Tag that dp was held with, will be used to release dp.
	dsl_pool_t *dp;
	/* To snapshot args */
	const char *tosnap;
	dsl_dataset_t *to_ds;
	/* From snapshot args */
	zfs_bookmark_phys_t ancestor_zb;
	uint64_t *fromredactsnaps;
	/* NUM_SNAPS_NOT_REDACTED if not sending from redaction bookmark */
	uint64_t numfromredactsnaps;
	/* Stream params */
	boolean_t is_clone;
	boolean_t embedok;
	boolean_t large_block_ok;
	boolean_t compressok;
	boolean_t rawok;
	boolean_t savedok;
	uint64_t resumeobj;
	uint64_t resumeoff;
	uint64_t saved_guid;
	zfs_bookmark_phys_t *redactbook;
	/* Stream output params */
	dmu_send_outparams_t *dso;

	/* Stream progress params */
	offset_t *off;
	int outfd;
	char saved_toname[MAXNAMELEN];
	};

	static int
	setup_featureflags(struct dmu_send_params dspp, objset_t os,
	uint64_t *featureflags)
	{
	dsl_dataset_t *to_ds = dspp->to_ds;
	dsl_pool_t *dp = dspp->dp;
	#ifdef _KERNEL
	if (dmu_objset_type(os) == DMU_OST_ZFS) {
	uint64_t version;
	if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0)
	return (SET_ERROR(EINVAL));

	if (version >= ZPL_VERSION_SA)
	*featureflags \|= DMU_BACKUP_FEATURE_SA_SPILL;
	}
	#endif

	/* raw sends imply large_block_ok */
	if ((dspp->rawok \|\| dspp->large_block_ok) &&
	dsl_dataset_feature_is_active(to_ds, SPA_FEATURE_LARGE_BLOCKS)) {
	*featureflags \|= DMU_BACKUP_FEATURE_LARGE_BLOCKS;
	}

	/* encrypted datasets will not have embedded blocks */
	if ((dspp->embedok \|\| dspp->rawok) && !os->os_encrypted &&
	spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) {
	*featureflags \|= DMU_BACKUP_FEATURE_EMBED_DATA;
	}

	/* raw send implies compressok */
	if (dspp->compressok \|\| dspp->rawok)
	*featureflags \|= DMU_BACKUP_FEATURE_COMPRESSED;

	if (dspp->rawok && os->os_encrypted)
	*featureflags \|= DMU_BACKUP_FEATURE_RAW;

	if ((*featureflags &
	(DMU_BACKUP_FEATURE_EMBED_DATA \| DMU_BACKUP_FEATURE_COMPRESSED \|
	DMU_BACKUP_FEATURE_RAW)) != 0 &&
	spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) {
	*featureflags \|= DMU_BACKUP_FEATURE_LZ4;
	}

	/*
	* We specifically do not include DMU_BACKUP_FEATURE_EMBED_DATA here to
	* allow sending ZSTD compressed datasets to a receiver that does not
	* support ZSTD
	*/
	if ((*featureflags &
	(DMU_BACKUP_FEATURE_COMPRESSED \| DMU_BACKUP_FEATURE_RAW)) != 0 &&
	dsl_dataset_feature_is_active(to_ds, SPA_FEATURE_ZSTD_COMPRESS)) {
	*featureflags \|= DMU_BACKUP_FEATURE_ZSTD;
	}

	if (dspp->resumeobj != 0 \|\| dspp->resumeoff != 0) {
	*featureflags \|= DMU_BACKUP_FEATURE_RESUMING;
	}

	if (dspp->redactbook != NULL) {
	*featureflags \|= DMU_BACKUP_FEATURE_REDACTED;
	}

	if (dsl_dataset_feature_is_active(to_ds, SPA_FEATURE_LARGE_DNODE)) {
	*featureflags \|= DMU_BACKUP_FEATURE_LARGE_DNODE;
	}
	return (0);
	}

	static dmu_replay_record_t *
	create_begin_record(struct dmu_send_params dspp, objset_t os,
	uint64_t featureflags)
	{
	dmu_replay_record_t *drr = kmem_zalloc(sizeof (dmu_replay_record_t),
	KM_SLEEP);
	drr->drr_type = DRR_BEGIN;

	struct drr_begin *drrb = &drr->drr_u.drr_begin;
	dsl_dataset_t *to_ds = dspp->to_ds;

	drrb->drr_magic = DMU_BACKUP_MAGIC;
	drrb->drr_creation_time = dsl_dataset_phys(to_ds)->ds_creation_time;
	drrb->drr_type = dmu_objset_type(os);
	drrb->drr_toguid = dsl_dataset_phys(to_ds)->ds_guid;
	drrb->drr_fromguid = dspp->ancestor_zb.zbm_guid;

	DMU_SET_STREAM_HDRTYPE(drrb->drr_versioninfo, DMU_SUBSTREAM);
	DMU_SET_FEATUREFLAGS(drrb->drr_versioninfo, featureflags);

	if (dspp->is_clone)
	drrb->drr_flags \|= DRR_FLAG_CLONE;
	if (dsl_dataset_phys(dspp->to_ds)->ds_flags & DS_FLAG_CI_DATASET)
	drrb->drr_flags \|= DRR_FLAG_CI_DATA;
	if (zfs_send_set_freerecords_bit)
	drrb->drr_flags \|= DRR_FLAG_FREERECORDS;
	drr->drr_u.drr_begin.drr_flags \|= DRR_FLAG_SPILL_BLOCK;

	if (dspp->savedok) {
	drrb->drr_toguid = dspp->saved_guid;
	strlcpy(drrb->drr_toname, dspp->saved_toname,
	sizeof (drrb->drr_toname));
	} else {
	dsl_dataset_name(to_ds, drrb->drr_toname);
	if (!to_ds->ds_is_snapshot) {
	(void) strlcat(drrb->drr_toname, "@--head--",
	sizeof (drrb->drr_toname));
	}
	}
	return (drr);
	}

	static void
	setup_to_thread(struct send_thread_arg to_arg, objset_t to_os,
	dmu_sendstatus_t *dssp, uint64_t fromtxg, boolean_t rawok)
	{
	VERIFY0(bqueue_init(&to_arg->q, zfs_send_no_prefetch_queue_ff,
	MAX(zfs_send_no_prefetch_queue_length, 2 * zfs_max_recordsize),
	offsetof(struct send_range, ln)));
	to_arg->error_code = 0;
	to_arg->cancel = B_FALSE;
	to_arg->os = to_os;
	to_arg->fromtxg = fromtxg;
	to_arg->flags = TRAVERSE_PRE \| TRAVERSE_PREFETCH_METADATA;
	if (rawok)
	to_arg->flags \|= TRAVERSE_NO_DECRYPT;
	+ if (zfs_send_corrupt_data)
	+ to_arg->flags \|= TRAVERSE_HARD;
	to_arg->num_blocks_visited = &dssp->dss_blocks;
	(void) thread_create(NULL, 0, send_traverse_thread, to_arg, 0,
	curproc, TS_RUN, minclsyspri);
	}

	static void
	setup_from_thread(struct redact_list_thread_arg *from_arg,
	redaction_list_t from_rl, dmu_sendstatus_t dssp)
	{
	VERIFY0(bqueue_init(&from_arg->q, zfs_send_no_prefetch_queue_ff,
	MAX(zfs_send_no_prefetch_queue_length, 2 * zfs_max_recordsize),
	offsetof(struct send_range, ln)));
	from_arg->error_code = 0;
	from_arg->cancel = B_FALSE;
	from_arg->rl = from_rl;
	from_arg->mark_redact = B_FALSE;
	from_arg->num_blocks_visited = &dssp->dss_blocks;
	/*
	* If from_ds is null, send_traverse_thread just returns success and
	* enqueues an eos marker.
	*/
	(void) thread_create(NULL, 0, redact_list_thread, from_arg, 0,
	curproc, TS_RUN, minclsyspri);
	}

	static void
	setup_redact_list_thread(struct redact_list_thread_arg *rlt_arg,
	struct dmu_send_params dspp, redaction_list_t rl, dmu_sendstatus_t *dssp)
	{
	if (dspp->redactbook == NULL)
	return;

	rlt_arg->cancel = B_FALSE;
	VERIFY0(bqueue_init(&rlt_arg->q, zfs_send_no_prefetch_queue_ff,
	MAX(zfs_send_no_prefetch_queue_length, 2 * zfs_max_recordsize),
	offsetof(struct send_range, ln)));
	rlt_arg->error_code = 0;
	rlt_arg->mark_redact = B_TRUE;
	rlt_arg->rl = rl;
	rlt_arg->num_blocks_visited = &dssp->dss_blocks;

	(void) thread_create(NULL, 0, redact_list_thread, rlt_arg, 0,
	curproc, TS_RUN, minclsyspri);
	}

	static void
	setup_merge_thread(struct send_merge_thread_arg *smt_arg,
	struct dmu_send_params dspp, struct redact_list_thread_arg from_arg,
	struct send_thread_arg to_arg, struct redact_list_thread_arg rlt_arg,
	objset_t *os)
	{
	VERIFY0(bqueue_init(&smt_arg->q, zfs_send_no_prefetch_queue_ff,
	MAX(zfs_send_no_prefetch_queue_length, 2 * zfs_max_recordsize),
	offsetof(struct send_range, ln)));
	smt_arg->cancel = B_FALSE;
	smt_arg->error = 0;
	smt_arg->from_arg = from_arg;
	smt_arg->to_arg = to_arg;
	if (dspp->redactbook != NULL)
	smt_arg->redact_arg = rlt_arg;

	smt_arg->os = os;
	(void) thread_create(NULL, 0, send_merge_thread, smt_arg, 0, curproc,
	TS_RUN, minclsyspri);
	}

	static void
	setup_reader_thread(struct send_reader_thread_arg *srt_arg,
	struct dmu_send_params dspp, struct send_merge_thread_arg smt_arg,
	uint64_t featureflags)
	{
	VERIFY0(bqueue_init(&srt_arg->q, zfs_send_queue_ff,
	MAX(zfs_send_queue_length, 2 * zfs_max_recordsize),
	offsetof(struct send_range, ln)));
	srt_arg->smta = smt_arg;
	srt_arg->issue_reads = !dspp->dso->dso_dryrun;
	srt_arg->featureflags = featureflags;
	(void) thread_create(NULL, 0, send_reader_thread, srt_arg, 0,
	curproc, TS_RUN, minclsyspri);
	}

	static int
	setup_resume_points(struct dmu_send_params *dspp,
	struct send_thread_arg to_arg, struct redact_list_thread_arg from_arg,
	struct redact_list_thread_arg *rlt_arg,
	struct send_merge_thread_arg smt_arg, boolean_t resuming, objset_t os,
	redaction_list_t redact_rl, nvlist_t nvl)
	{
	dsl_dataset_t *to_ds = dspp->to_ds;
	int err = 0;

	uint64_t obj = 0;
	uint64_t blkid = 0;
	if (resuming) {
	obj = dspp->resumeobj;
	dmu_object_info_t to_doi;
	err = dmu_object_info(os, obj, &to_doi);
	if (err != 0)
	return (err);

	blkid = dspp->resumeoff / to_doi.doi_data_block_size;
	}
	/*
	* If we're resuming a redacted send, we can skip to the appropriate
	* point in the redaction bookmark by binary searching through it.
	*/
	if (redact_rl != NULL) {
	SET_BOOKMARK(&rlt_arg->resume, to_ds->ds_object, obj, 0, blkid);
	}

	SET_BOOKMARK(&to_arg->resume, to_ds->ds_object, obj, 0, blkid);
	if (nvlist_exists(nvl, BEGINNV_REDACT_FROM_SNAPS)) {
	uint64_t objset = dspp->ancestor_zb.zbm_redaction_obj;
	/*
	* Note: If the resume point is in an object whose
	* blocksize is different in the from vs to snapshots,
	* we will have divided by the "wrong" blocksize.
	* However, in this case fromsnap's send_cb() will
	* detect that the blocksize has changed and therefore
	* ignore this object.
	*
	* If we're resuming a send from a redaction bookmark,
	* we still cannot accidentally suggest blocks behind
	* the to_ds. In addition, we know that any blocks in
	* the object in the to_ds will have to be sent, since
	* the size changed. Therefore, we can't cause any harm
	* this way either.
	*/
	SET_BOOKMARK(&from_arg->resume, objset, obj, 0, blkid);
	}
	if (resuming) {
	fnvlist_add_uint64(nvl, BEGINNV_RESUME_OBJECT, dspp->resumeobj);
	fnvlist_add_uint64(nvl, BEGINNV_RESUME_OFFSET, dspp->resumeoff);
	}
	return (0);
	}

	static dmu_sendstatus_t *
	setup_send_progress(struct dmu_send_params *dspp)
	{
	dmu_sendstatus_t dssp = kmem_zalloc(sizeof (dssp), KM_SLEEP);
	dssp->dss_outfd = dspp->outfd;
	dssp->dss_off = dspp->off;
	dssp->dss_proc = curproc;
	mutex_enter(&dspp->to_ds->ds_sendstream_lock);
	list_insert_head(&dspp->to_ds->ds_sendstreams, dssp);
	mutex_exit(&dspp->to_ds->ds_sendstream_lock);
	return (dssp);
	}

	/*
	* Actually do the bulk of the work in a zfs send.
	*
	* The idea is that we want to do a send from ancestor_zb to to_ds. We also
	* want to not send any data that has been modified by all the datasets in
	* redactsnaparr, and store the list of blocks that are redacted in this way in
	* a bookmark named redactbook, created on the to_ds. We do this by creating
	* several worker threads, whose function is described below.
	*
	* There are three cases.
	* The first case is a redacted zfs send. In this case there are 5 threads.
	* The first thread is the to_ds traversal thread: it calls dataset_traverse on
	* the to_ds and finds all the blocks that have changed since ancestor_zb (if
	* it's a full send, that's all blocks in the dataset). It then sends those
	* blocks on to the send merge thread. The redact list thread takes the data
	* from the redaction bookmark and sends those blocks on to the send merge
	* thread. The send merge thread takes the data from the to_ds traversal
	* thread, and combines it with the redaction records from the redact list
	* thread. If a block appears in both the to_ds's data and the redaction data,
	* the send merge thread will mark it as redacted and send it on to the prefetch
	* thread. Otherwise, the send merge thread will send the block on to the
	* prefetch thread unchanged. The prefetch thread will issue prefetch reads for
	* any data that isn't redacted, and then send the data on to the main thread.
	* The main thread behaves the same as in a normal send case, issuing demand
	* reads for data blocks and sending out records over the network
	*
	* The graphic below diagrams the flow of data in the case of a redacted zfs
	* send. Each box represents a thread, and each line represents the flow of
	* data.
	*
	* Records from the \|
	* redaction bookmark \|
	* +--------------------+ \| +---------------------------+
	* \| \| v \| Send Merge Thread \|
	* \| Redact List Thread +----------> Apply redaction marks to \|
	* \| \| \| records as specified by \|
	* +--------------------+ \| redaction ranges \|
	* +----^---------------+------+
	* \| \| Merged data
	* \| \|
	* \| +------------v--------+
	* \| \| Prefetch Thread \|
	* +--------------------+ \| \| Issues prefetch \|
	* \| to_ds Traversal \| \| \| reads of data blocks\|
	* \| Thread (finds +---------------+ +------------+--------+
	* \| candidate blocks) \| Blocks modified \| Prefetched data
	* +--------------------+ by to_ds since \|
	* ancestor_zb +------------v----+
	* \| Main Thread \| File Descriptor
	* \| Sends data over +->(to zfs receive)
	* \| wire \|
	* +-----------------+
	*
	* The second case is an incremental send from a redaction bookmark. The to_ds
	* traversal thread and the main thread behave the same as in the redacted
	* send case. The new thread is the from bookmark traversal thread. It
	* iterates over the redaction list in the redaction bookmark, and enqueues
	* records for each block that was redacted in the original send. The send
	* merge thread now has to merge the data from the two threads. For details
	* about that process, see the header comment of send_merge_thread(). Any data
	* it decides to send on will be prefetched by the prefetch thread. Note that
	* you can perform a redacted send from a redaction bookmark; in that case,
	* the data flow behaves very similarly to the flow in the redacted send case,
	* except with the addition of the bookmark traversal thread iterating over the
	* redaction bookmark. The send_merge_thread also has to take on the
	* responsibility of merging the redact list thread's records, the bookmark
	* traversal thread's records, and the to_ds records.
	*
	* +---------------------+
	* \| \|
	* \| Redact List Thread +--------------+
	* \| \| \|
	* +---------------------+ \|
	* Blocks in redaction list \| Ranges modified by every secure snap
	* of from bookmark \| (or EOS if not readcted)
	* \|
	* +---------------------+ \| +----v----------------------+
	* \| bookmark Traversal \| v \| Send Merge Thread \|
	* \| Thread (finds +---------> Merges bookmark, rlt, and \|
	* \| candidate blocks) \| \| to_ds send records \|
	* +---------------------+ +----^---------------+------+
	* \| \| Merged data
	* \| +------------v--------+
	* \| \| Prefetch Thread \|
	* +--------------------+ \| \| Issues prefetch \|
	* \| to_ds Traversal \| \| \| reads of data blocks\|
	* \| Thread (finds +---------------+ +------------+--------+
	* \| candidate blocks) \| Blocks modified \| Prefetched data
	* +--------------------+ by to_ds since +------------v----+
	* ancestor_zb \| Main Thread \| File Descriptor
	* \| Sends data over +->(to zfs receive)
	* \| wire \|
	* +-----------------+
	*
	* The final case is a simple zfs full or incremental send. The to_ds traversal
	* thread behaves the same as always. The redact list thread is never started.
	* The send merge thread takes all the blocks that the to_ds traversal thread
	* sends it, prefetches the data, and sends the blocks on to the main thread.
	* The main thread sends the data over the wire.
	*
	* To keep performance acceptable, we want to prefetch the data in the worker
	* threads. While the to_ds thread could simply use the TRAVERSE_PREFETCH
	* feature built into traverse_dataset, the combining and deletion of records
	* due to redaction and sends from redaction bookmarks mean that we could
	* issue many unnecessary prefetches. As a result, we only prefetch data
	* after we've determined that the record is not going to be redacted. To
	* prevent the prefetching from getting too far ahead of the main thread, the
	* blocking queues that are used for communication are capped not by the
	* number of entries in the queue, but by the sum of the size of the
	* prefetches associated with them. The limit on the amount of data that the
	* thread can prefetch beyond what the main thread has reached is controlled
	* by the global variable zfs_send_queue_length. In addition, to prevent poor
	* performance in the beginning of a send, we also limit the distance ahead
	* that the traversal threads can be. That distance is controlled by the
	* zfs_send_no_prefetch_queue_length tunable.
	*
	* Note: Releases dp using the specified tag.
	*/
	static int
	dmu_send_impl(struct dmu_send_params *dspp)
	{
	objset_t *os;
	dmu_replay_record_t *drr;
	dmu_sendstatus_t *dssp;
	dmu_send_cookie_t dsc = {0};
	int err;
	uint64_t fromtxg = dspp->ancestor_zb.zbm_creation_txg;
	uint64_t featureflags = 0;
	struct redact_list_thread_arg *from_arg;
	struct send_thread_arg *to_arg;
	struct redact_list_thread_arg *rlt_arg;
	struct send_merge_thread_arg *smt_arg;
	struct send_reader_thread_arg *srt_arg;
	struct send_range *range;
	redaction_list_t *from_rl = NULL;
	redaction_list_t *redact_rl = NULL;
	boolean_t resuming = (dspp->resumeobj != 0 \|\| dspp->resumeoff != 0);
	boolean_t book_resuming = resuming;

	dsl_dataset_t *to_ds = dspp->to_ds;
	zfs_bookmark_phys_t *ancestor_zb = &dspp->ancestor_zb;
	dsl_pool_t *dp = dspp->dp;
	void *tag = dspp->tag;

	err = dmu_objset_from_ds(to_ds, &os);
	if (err != 0) {
	dsl_pool_rele(dp, tag);
	return (err);
	}

	/*
	* If this is a non-raw send of an encrypted ds, we can ensure that
	* the objset_phys_t is authenticated. This is safe because this is
	* either a snapshot or we have owned the dataset, ensuring that
	* it can't be modified.
	*/
	if (!dspp->rawok && os->os_encrypted &&
	arc_is_unauthenticated(os->os_phys_buf)) {
	zbookmark_phys_t zb;

	SET_BOOKMARK(&zb, to_ds->ds_object, ZB_ROOT_OBJECT,
	ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
	err = arc_untransform(os->os_phys_buf, os->os_spa,
	&zb, B_FALSE);
	if (err != 0) {
	dsl_pool_rele(dp, tag);
	return (err);
	}

	ASSERT0(arc_is_unauthenticated(os->os_phys_buf));
	}

	if ((err = setup_featureflags(dspp, os, &featureflags)) != 0) {
	dsl_pool_rele(dp, tag);
	return (err);
	}

	/*
	* If we're doing a redacted send, hold the bookmark's redaction list.
	*/
	if (dspp->redactbook != NULL) {
	err = dsl_redaction_list_hold_obj(dp,
	dspp->redactbook->zbm_redaction_obj, FTAG,
	&redact_rl);
	if (err != 0) {
	dsl_pool_rele(dp, tag);
	return (SET_ERROR(EINVAL));
	}
	dsl_redaction_list_long_hold(dp, redact_rl, FTAG);
	}

	/*
	* If we're sending from a redaction bookmark, hold the redaction list
	* so that we can consider sending the redacted blocks.
	*/
	if (ancestor_zb->zbm_redaction_obj != 0) {
	err = dsl_redaction_list_hold_obj(dp,
	ancestor_zb->zbm_redaction_obj, FTAG, &from_rl);
	if (err != 0) {
	if (redact_rl != NULL) {
	dsl_redaction_list_long_rele(redact_rl, FTAG);
	dsl_redaction_list_rele(redact_rl, FTAG);
	}
	dsl_pool_rele(dp, tag);
	return (SET_ERROR(EINVAL));
	}
	dsl_redaction_list_long_hold(dp, from_rl, FTAG);
	}

	dsl_dataset_long_hold(to_ds, FTAG);

	from_arg = kmem_zalloc(sizeof (*from_arg), KM_SLEEP);
	to_arg = kmem_zalloc(sizeof (*to_arg), KM_SLEEP);
	rlt_arg = kmem_zalloc(sizeof (*rlt_arg), KM_SLEEP);
	smt_arg = kmem_zalloc(sizeof (*smt_arg), KM_SLEEP);
	srt_arg = kmem_zalloc(sizeof (*srt_arg), KM_SLEEP);

	drr = create_begin_record(dspp, os, featureflags);
	dssp = setup_send_progress(dspp);

	dsc.dsc_drr = drr;
	dsc.dsc_dso = dspp->dso;
	dsc.dsc_os = os;
	dsc.dsc_off = dspp->off;
	dsc.dsc_toguid = dsl_dataset_phys(to_ds)->ds_guid;
	dsc.dsc_fromtxg = fromtxg;
	dsc.dsc_pending_op = PENDING_NONE;
	dsc.dsc_featureflags = featureflags;
	dsc.dsc_resume_object = dspp->resumeobj;
	dsc.dsc_resume_offset = dspp->resumeoff;

	dsl_pool_rele(dp, tag);

	void *payload = NULL;
	size_t payload_len = 0;
	nvlist_t *nvl = fnvlist_alloc();

	/*
	* If we're doing a redacted send, we include the snapshots we're
	* redacted with respect to so that the target system knows what send
	* streams can be correctly received on top of this dataset. If we're
	* instead sending a redacted dataset, we include the snapshots that the
	* dataset was created with respect to.
	*/
	if (dspp->redactbook != NULL) {
	fnvlist_add_uint64_array(nvl, BEGINNV_REDACT_SNAPS,
	redact_rl->rl_phys->rlp_snaps,
	redact_rl->rl_phys->rlp_num_snaps);
	} else if (dsl_dataset_feature_is_active(to_ds,
	SPA_FEATURE_REDACTED_DATASETS)) {
	uint64_t *tods_guids;
	uint64_t length;
	VERIFY(dsl_dataset_get_uint64_array_feature(to_ds,
	SPA_FEATURE_REDACTED_DATASETS, &length, &tods_guids));
	fnvlist_add_uint64_array(nvl, BEGINNV_REDACT_SNAPS, tods_guids,
	length);
	}

	/*
	* If we're sending from a redaction bookmark, then we should retrieve
	* the guids of that bookmark so we can send them over the wire.
	*/
	if (from_rl != NULL) {
	fnvlist_add_uint64_array(nvl, BEGINNV_REDACT_FROM_SNAPS,
	from_rl->rl_phys->rlp_snaps,
	from_rl->rl_phys->rlp_num_snaps);
	}

	/*
	* If the snapshot we're sending from is redacted, include the redaction
	* list in the stream.
	*/
	if (dspp->numfromredactsnaps != NUM_SNAPS_NOT_REDACTED) {
	ASSERT3P(from_rl, ==, NULL);
	fnvlist_add_uint64_array(nvl, BEGINNV_REDACT_FROM_SNAPS,
	dspp->fromredactsnaps, (uint_t)dspp->numfromredactsnaps);
	if (dspp->numfromredactsnaps > 0) {
	kmem_free(dspp->fromredactsnaps,
	dspp->numfromredactsnaps * sizeof (uint64_t));
	dspp->fromredactsnaps = NULL;
	}
	}

	if (resuming \|\| book_resuming) {
	err = setup_resume_points(dspp, to_arg, from_arg,
	rlt_arg, smt_arg, resuming, os, redact_rl, nvl);
	if (err != 0)
	goto out;
	}

	if (featureflags & DMU_BACKUP_FEATURE_RAW) {
	uint64_t ivset_guid = (ancestor_zb != NULL) ?
	ancestor_zb->zbm_ivset_guid : 0;
	nvlist_t *keynvl = NULL;
	ASSERT(os->os_encrypted);

	err = dsl_crypto_populate_key_nvlist(os, ivset_guid,
	&keynvl);
	if (err != 0) {
	fnvlist_free(nvl);
	goto out;
	}

	fnvlist_add_nvlist(nvl, "crypt_keydata", keynvl);
	fnvlist_free(keynvl);
	}

	if (!nvlist_empty(nvl)) {
	payload = fnvlist_pack(nvl, &payload_len);
	drr->drr_payloadlen = payload_len;
	}

	fnvlist_free(nvl);
	err = dump_record(&dsc, payload, payload_len);
	fnvlist_pack_free(payload, payload_len);
	if (err != 0) {
	err = dsc.dsc_err;
	goto out;
	}

	setup_to_thread(to_arg, os, dssp, fromtxg, dspp->rawok);
	setup_from_thread(from_arg, from_rl, dssp);
	setup_redact_list_thread(rlt_arg, dspp, redact_rl, dssp);
	setup_merge_thread(smt_arg, dspp, from_arg, to_arg, rlt_arg, os);
	setup_reader_thread(srt_arg, dspp, smt_arg, featureflags);

	range = bqueue_dequeue(&srt_arg->q);
	while (err == 0 && !range->eos_marker) {
	err = do_dump(&dsc, range);
	range = get_next_range(&srt_arg->q, range);
	if (issig(JUSTLOOKING) && issig(FORREAL))
	err = SET_ERROR(EINTR);
	}

	/*
	* If we hit an error or are interrupted, cancel our worker threads and
	* clear the queue of any pending records. The threads will pass the
	* cancel up the tree of worker threads, and each one will clean up any
	* pending records before exiting.
	*/
	if (err != 0) {
	srt_arg->cancel = B_TRUE;
	while (!range->eos_marker) {
	range = get_next_range(&srt_arg->q, range);
	}
	}
	range_free(range);

	bqueue_destroy(&srt_arg->q);
	bqueue_destroy(&smt_arg->q);
	if (dspp->redactbook != NULL)
	bqueue_destroy(&rlt_arg->q);
	bqueue_destroy(&to_arg->q);
	bqueue_destroy(&from_arg->q);

	if (err == 0 && srt_arg->error != 0)
	err = srt_arg->error;

	if (err != 0)
	goto out;

	if (dsc.dsc_pending_op != PENDING_NONE)
	if (dump_record(&dsc, NULL, 0) != 0)
	err = SET_ERROR(EINTR);

	if (err != 0) {
	if (err == EINTR && dsc.dsc_err != 0)
	err = dsc.dsc_err;
	goto out;
	}

	/*
	* Send the DRR_END record if this is not a saved stream.
	* Otherwise, the omitted DRR_END record will signal to
	* the receive side that the stream is incomplete.
	*/
	if (!dspp->savedok) {
	bzero(drr, sizeof (dmu_replay_record_t));
	drr->drr_type = DRR_END;
	drr->drr_u.drr_end.drr_checksum = dsc.dsc_zc;
	drr->drr_u.drr_end.drr_toguid = dsc.dsc_toguid;

	if (dump_record(&dsc, NULL, 0) != 0)
	err = dsc.dsc_err;
	}
	out:
	mutex_enter(&to_ds->ds_sendstream_lock);
	list_remove(&to_ds->ds_sendstreams, dssp);
	mutex_exit(&to_ds->ds_sendstream_lock);

	VERIFY(err != 0 \|\| (dsc.dsc_sent_begin &&
	(dsc.dsc_sent_end \|\| dspp->savedok)));

	kmem_free(drr, sizeof (dmu_replay_record_t));
	kmem_free(dssp, sizeof (dmu_sendstatus_t));
	kmem_free(from_arg, sizeof (*from_arg));
	kmem_free(to_arg, sizeof (*to_arg));
	kmem_free(rlt_arg, sizeof (*rlt_arg));
	kmem_free(smt_arg, sizeof (*smt_arg));
	kmem_free(srt_arg, sizeof (*srt_arg));

	dsl_dataset_long_rele(to_ds, FTAG);
	if (from_rl != NULL) {
	dsl_redaction_list_long_rele(from_rl, FTAG);
	dsl_redaction_list_rele(from_rl, FTAG);
	}
	if (redact_rl != NULL) {
	dsl_redaction_list_long_rele(redact_rl, FTAG);
	dsl_redaction_list_rele(redact_rl, FTAG);
	}

	return (err);
	}

	int
	dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
	boolean_t embedok, boolean_t large_block_ok, boolean_t compressok,
	boolean_t rawok, boolean_t savedok, int outfd, offset_t *off,
	dmu_send_outparams_t *dsop)
	{
	int err;
	dsl_dataset_t *fromds;
	ds_hold_flags_t dsflags;
	struct dmu_send_params dspp = {0};
	dspp.embedok = embedok;
	dspp.large_block_ok = large_block_ok;
	dspp.compressok = compressok;
	dspp.outfd = outfd;
	dspp.off = off;
	dspp.dso = dsop;
	dspp.tag = FTAG;
	dspp.rawok = rawok;
	dspp.savedok = savedok;

	dsflags = (rawok) ? DS_HOLD_FLAG_NONE : DS_HOLD_FLAG_DECRYPT;
	err = dsl_pool_hold(pool, FTAG, &dspp.dp);
	if (err != 0)
	return (err);

	err = dsl_dataset_hold_obj_flags(dspp.dp, tosnap, dsflags, FTAG,
	&dspp.to_ds);
	if (err != 0) {
	dsl_pool_rele(dspp.dp, FTAG);
	return (err);
	}

	if (fromsnap != 0) {
	err = dsl_dataset_hold_obj_flags(dspp.dp, fromsnap, dsflags,
	FTAG, &fromds);
	if (err != 0) {
	dsl_dataset_rele_flags(dspp.to_ds, dsflags, FTAG);
	dsl_pool_rele(dspp.dp, FTAG);
	return (err);
	}
	dspp.ancestor_zb.zbm_guid = dsl_dataset_phys(fromds)->ds_guid;
	dspp.ancestor_zb.zbm_creation_txg =
	dsl_dataset_phys(fromds)->ds_creation_txg;
	dspp.ancestor_zb.zbm_creation_time =
	dsl_dataset_phys(fromds)->ds_creation_time;

	if (dsl_dataset_is_zapified(fromds)) {
	(void) zap_lookup(dspp.dp->dp_meta_objset,
	fromds->ds_object, DS_FIELD_IVSET_GUID, 8, 1,
	&dspp.ancestor_zb.zbm_ivset_guid);
	}

	/* See dmu_send for the reasons behind this. */
	uint64_t *fromredact;

	if (!dsl_dataset_get_uint64_array_feature(fromds,
	SPA_FEATURE_REDACTED_DATASETS,
	&dspp.numfromredactsnaps,
	&fromredact)) {
	dspp.numfromredactsnaps = NUM_SNAPS_NOT_REDACTED;
	} else if (dspp.numfromredactsnaps > 0) {
	uint64_t size = dspp.numfromredactsnaps *
	sizeof (uint64_t);
	dspp.fromredactsnaps = kmem_zalloc(size, KM_SLEEP);
	bcopy(fromredact, dspp.fromredactsnaps, size);
	}

	boolean_t is_before =
	dsl_dataset_is_before(dspp.to_ds, fromds, 0);
	dspp.is_clone = (dspp.to_ds->ds_dir !=
	fromds->ds_dir);
	dsl_dataset_rele(fromds, FTAG);
	if (!is_before) {
	dsl_pool_rele(dspp.dp, FTAG);
	err = SET_ERROR(EXDEV);
	} else {
	err = dmu_send_impl(&dspp);
	}
	} else {
	dspp.numfromredactsnaps = NUM_SNAPS_NOT_REDACTED;
	err = dmu_send_impl(&dspp);
	}
	dsl_dataset_rele(dspp.to_ds, FTAG);
	return (err);
	}

	int
	dmu_send(const char tosnap, const char fromsnap, boolean_t embedok,
	boolean_t large_block_ok, boolean_t compressok, boolean_t rawok,
	boolean_t savedok, uint64_t resumeobj, uint64_t resumeoff,
	const char redactbook, int outfd, offset_t off,
	dmu_send_outparams_t *dsop)
	{
	int err = 0;
	ds_hold_flags_t dsflags;
	boolean_t owned = B_FALSE;
	dsl_dataset_t *fromds = NULL;
	zfs_bookmark_phys_t book = {0};
	struct dmu_send_params dspp = {0};

	dsflags = (rawok) ? DS_HOLD_FLAG_NONE : DS_HOLD_FLAG_DECRYPT;
	dspp.tosnap = tosnap;
	dspp.embedok = embedok;
	dspp.large_block_ok = large_block_ok;
	dspp.compressok = compressok;
	dspp.outfd = outfd;
	dspp.off = off;
	dspp.dso = dsop;
	dspp.tag = FTAG;
	dspp.resumeobj = resumeobj;
	dspp.resumeoff = resumeoff;
	dspp.rawok = rawok;
	dspp.savedok = savedok;

	if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL)
	return (SET_ERROR(EINVAL));

	err = dsl_pool_hold(tosnap, FTAG, &dspp.dp);
	if (err != 0)
	return (err);

	if (strchr(tosnap, '@') == NULL && spa_writeable(dspp.dp->dp_spa)) {
	/*
	* We are sending a filesystem or volume. Ensure
	* that it doesn't change by owning the dataset.
	*/

	if (savedok) {
	/*
	* We are looking for the dataset that represents the
	* partially received send stream. If this stream was
	* received as a new snapshot of an existing dataset,
	* this will be saved in a hidden clone named
	* "<pool>/<dataset>/%recv". Otherwise, the stream
	* will be saved in the live dataset itself. In
	* either case we need to use dsl_dataset_own_force()
	* because the stream is marked as inconsistent,
	* which would normally make it unavailable to be
	* owned.
	*/
	char *name = kmem_asprintf("%s/%s", tosnap,
	recv_clone_name);
	err = dsl_dataset_own_force(dspp.dp, name, dsflags,
	FTAG, &dspp.to_ds);
	if (err == ENOENT) {
	err = dsl_dataset_own_force(dspp.dp, tosnap,
	dsflags, FTAG, &dspp.to_ds);
	}

	if (err == 0) {
	err = zap_lookup(dspp.dp->dp_meta_objset,
	dspp.to_ds->ds_object,
	DS_FIELD_RESUME_TOGUID, 8, 1,
	&dspp.saved_guid);
	}

	if (err == 0) {
	err = zap_lookup(dspp.dp->dp_meta_objset,
	dspp.to_ds->ds_object,
	DS_FIELD_RESUME_TONAME, 1,
	sizeof (dspp.saved_toname),
	dspp.saved_toname);
	}
	if (err != 0)
	dsl_dataset_disown(dspp.to_ds, dsflags, FTAG);

	kmem_strfree(name);
	} else {
	err = dsl_dataset_own(dspp.dp, tosnap, dsflags,
	FTAG, &dspp.to_ds);
	}
	owned = B_TRUE;
	} else {
	err = dsl_dataset_hold_flags(dspp.dp, tosnap, dsflags, FTAG,
	&dspp.to_ds);
	}

	if (err != 0) {
	dsl_pool_rele(dspp.dp, FTAG);
	return (err);
	}

	if (redactbook != NULL) {
	char path[ZFS_MAX_DATASET_NAME_LEN];
	(void) strlcpy(path, tosnap, sizeof (path));
	char *at = strchr(path, '@');
	if (at == NULL) {
	err = EINVAL;
	} else {
	(void) snprintf(at, sizeof (path) - (at - path), "#%s",
	redactbook);
	err = dsl_bookmark_lookup(dspp.dp, path,
	NULL, &book);
	dspp.redactbook = &book;
	}
	}

	if (err != 0) {
	dsl_pool_rele(dspp.dp, FTAG);
	if (owned)
	dsl_dataset_disown(dspp.to_ds, dsflags, FTAG);
	else
	dsl_dataset_rele_flags(dspp.to_ds, dsflags, FTAG);
	return (err);
	}

	if (fromsnap != NULL) {
	zfs_bookmark_phys_t *zb = &dspp.ancestor_zb;
	int fsnamelen;
	if (strpbrk(tosnap, "@#") != NULL)
	fsnamelen = strpbrk(tosnap, "@#") - tosnap;
	else
	fsnamelen = strlen(tosnap);

	/*
	* If the fromsnap is in a different filesystem, then
	* mark the send stream as a clone.
	*/
	if (strncmp(tosnap, fromsnap, fsnamelen) != 0 \|\|
	(fromsnap[fsnamelen] != '@' &&
	fromsnap[fsnamelen] != '#')) {
	dspp.is_clone = B_TRUE;
	}

	if (strchr(fromsnap, '@') != NULL) {
	err = dsl_dataset_hold(dspp.dp, fromsnap, FTAG,
	&fromds);

	if (err != 0) {
	ASSERT3P(fromds, ==, NULL);
	} else {
	/*
	* We need to make a deep copy of the redact
	* snapshots of the from snapshot, because the
	* array will be freed when we evict from_ds.
	*/
	uint64_t *fromredact;
	if (!dsl_dataset_get_uint64_array_feature(
	fromds, SPA_FEATURE_REDACTED_DATASETS,
	&dspp.numfromredactsnaps,
	&fromredact)) {
	dspp.numfromredactsnaps =
	NUM_SNAPS_NOT_REDACTED;
	} else if (dspp.numfromredactsnaps > 0) {
	uint64_t size =
	dspp.numfromredactsnaps *
	sizeof (uint64_t);
	dspp.fromredactsnaps = kmem_zalloc(size,
	KM_SLEEP);
	bcopy(fromredact, dspp.fromredactsnaps,
	size);
	}
	if (!dsl_dataset_is_before(dspp.to_ds, fromds,
	0)) {
	err = SET_ERROR(EXDEV);
	} else {
	zb->zbm_creation_txg =
	dsl_dataset_phys(fromds)->
	ds_creation_txg;
	zb->zbm_creation_time =
	dsl_dataset_phys(fromds)->
	ds_creation_time;
	zb->zbm_guid =
	dsl_dataset_phys(fromds)->ds_guid;
	zb->zbm_redaction_obj = 0;

	if (dsl_dataset_is_zapified(fromds)) {
	(void) zap_lookup(
	dspp.dp->dp_meta_objset,
	fromds->ds_object,
	DS_FIELD_IVSET_GUID, 8, 1,
	&zb->zbm_ivset_guid);
	}
	}
	dsl_dataset_rele(fromds, FTAG);
	}
	} else {
	dspp.numfromredactsnaps = NUM_SNAPS_NOT_REDACTED;
	err = dsl_bookmark_lookup(dspp.dp, fromsnap, dspp.to_ds,
	zb);
	if (err == EXDEV && zb->zbm_redaction_obj != 0 &&
	zb->zbm_guid ==
	dsl_dataset_phys(dspp.to_ds)->ds_guid)
	err = 0;
	}

	if (err == 0) {
	/* dmu_send_impl will call dsl_pool_rele for us. */
	err = dmu_send_impl(&dspp);
	} else {
	dsl_pool_rele(dspp.dp, FTAG);
	}
	} else {
	dspp.numfromredactsnaps = NUM_SNAPS_NOT_REDACTED;
	err = dmu_send_impl(&dspp);
	}
	if (owned)
	dsl_dataset_disown(dspp.to_ds, dsflags, FTAG);
	else
	dsl_dataset_rele_flags(dspp.to_ds, dsflags, FTAG);
	return (err);
	}

	static int
	dmu_adjust_send_estimate_for_indirects(dsl_dataset_t *ds, uint64_t uncompressed,
	uint64_t compressed, boolean_t stream_compressed, uint64_t *sizep)
	{
	int err = 0;
	uint64_t size;
	/*
	* Assume that space (both on-disk and in-stream) is dominated by
	* data. We will adjust for indirect blocks and the copies property,
	* but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
	*/

	uint64_t recordsize;
	uint64_t record_count;
	objset_t *os;
	VERIFY0(dmu_objset_from_ds(ds, &os));

	/* Assume all (uncompressed) blocks are recordsize. */
	if (zfs_override_estimate_recordsize != 0) {
	recordsize = zfs_override_estimate_recordsize;
	} else if (os->os_phys->os_type == DMU_OST_ZVOL) {
	err = dsl_prop_get_int_ds(ds,
	zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &recordsize);
	} else {
	err = dsl_prop_get_int_ds(ds,
	zfs_prop_to_name(ZFS_PROP_RECORDSIZE), &recordsize);
	}
	if (err != 0)
	return (err);
	record_count = uncompressed / recordsize;

	/*
	* If we're estimating a send size for a compressed stream, use the
	* compressed data size to estimate the stream size. Otherwise, use the
	* uncompressed data size.
	*/
	size = stream_compressed ? compressed : uncompressed;

	/*
	* Subtract out approximate space used by indirect blocks.
	* Assume most space is used by data blocks (non-indirect, non-dnode).
	* Assume no ditto blocks or internal fragmentation.
	*
	* Therefore, space used by indirect blocks is sizeof(blkptr_t) per
	* block.
	*/
	size -= record_count * sizeof (blkptr_t);

	/* Add in the space for the record associated with each block. */
	size += record_count * sizeof (dmu_replay_record_t);

	*sizep = size;

	return (0);
	}

	int
	dmu_send_estimate_fast(dsl_dataset_t origds, dsl_dataset_t fromds,
	zfs_bookmark_phys_t *frombook, boolean_t stream_compressed,
	boolean_t saved, uint64_t *sizep)
	{
	int err;
	dsl_dataset_t *ds = origds;
	uint64_t uncomp, comp;

	ASSERT(dsl_pool_config_held(origds->ds_dir->dd_pool));
	ASSERT(fromds == NULL \|\| frombook == NULL);

	/*
	* If this is a saved send we may actually be sending
	* from the %recv clone used for resuming.
	*/
	if (saved) {
	objset_t *mos = origds->ds_dir->dd_pool->dp_meta_objset;
	uint64_t guid;
	char dsname[ZFS_MAX_DATASET_NAME_LEN + 6];

	dsl_dataset_name(origds, dsname);
	(void) strcat(dsname, "/");
	(void) strcat(dsname, recv_clone_name);

	err = dsl_dataset_hold(origds->ds_dir->dd_pool,
	dsname, FTAG, &ds);
	if (err != ENOENT && err != 0) {
	return (err);
	} else if (err == ENOENT) {
	ds = origds;
	}

	/* check that this dataset has partially received data */
	err = zap_lookup(mos, ds->ds_object,
	DS_FIELD_RESUME_TOGUID, 8, 1, &guid);
	if (err != 0) {
	err = SET_ERROR(err == ENOENT ? EINVAL : err);
	goto out;
	}

	err = zap_lookup(mos, ds->ds_object,
	DS_FIELD_RESUME_TONAME, 1, sizeof (dsname), dsname);
	if (err != 0) {
	err = SET_ERROR(err == ENOENT ? EINVAL : err);
	goto out;
	}
	}

	/* tosnap must be a snapshot or the target of a saved send */
	if (!ds->ds_is_snapshot && ds == origds)
	return (SET_ERROR(EINVAL));

	if (fromds != NULL) {
	uint64_t used;
	if (!fromds->ds_is_snapshot) {
	err = SET_ERROR(EINVAL);
	goto out;
	}

	if (!dsl_dataset_is_before(ds, fromds, 0)) {
	err = SET_ERROR(EXDEV);
	goto out;
	}

	err = dsl_dataset_space_written(fromds, ds, &used, &comp,
	&uncomp);
	if (err != 0)
	goto out;
	} else if (frombook != NULL) {
	uint64_t used;
	err = dsl_dataset_space_written_bookmark(frombook, ds, &used,
	&comp, &uncomp);
	if (err != 0)
	goto out;
	} else {
	uncomp = dsl_dataset_phys(ds)->ds_uncompressed_bytes;
	comp = dsl_dataset_phys(ds)->ds_compressed_bytes;
	}

	err = dmu_adjust_send_estimate_for_indirects(ds, uncomp, comp,
	stream_compressed, sizep);
	/*
	* Add the size of the BEGIN and END records to the estimate.
	*/
	sizep += 2 sizeof (dmu_replay_record_t);

	out:
	if (ds != origds)
	dsl_dataset_rele(ds, FTAG);
	return (err);
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_send, zfs_send_, corrupt_data, INT, ZMOD_RW,
	"Allow sending corrupt data");

	ZFS_MODULE_PARAM(zfs_send, zfs_send_, queue_length, INT, ZMOD_RW,
	"Maximum send queue length");

	ZFS_MODULE_PARAM(zfs_send, zfs_send_, unmodified_spill_blocks, INT, ZMOD_RW,
	"Send unmodified spill blocks");

	ZFS_MODULE_PARAM(zfs_send, zfs_send_, no_prefetch_queue_length, INT, ZMOD_RW,
	"Maximum send queue length for non-prefetch queues");

	ZFS_MODULE_PARAM(zfs_send, zfs_send_, queue_ff, INT, ZMOD_RW,
	"Send queue fill fraction");

	ZFS_MODULE_PARAM(zfs_send, zfs_send_, no_prefetch_queue_ff, INT, ZMOD_RW,
	"Send queue fill fraction for non-prefetch queues");

	ZFS_MODULE_PARAM(zfs_send, zfs_, override_estimate_recordsize, INT, ZMOD_RW,
	"Override block size estimate with fixed size");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/dmu_zfetch.c b/sys/contrib/openzfs/module/zfs/dmu_zfetch.c
	index 4a323fa990fe..a26b0d739921 100644
	--- a/sys/contrib/openzfs/module/zfs/dmu_zfetch.c
	+++ b/sys/contrib/openzfs/module/zfs/dmu_zfetch.c
	@@ -1,548 +1,550 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	/*
	* Copyright (c) 2013, 2017 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/dnode.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_zfetch.h>
	#include <sys/dmu.h>
	#include <sys/dbuf.h>
	#include <sys/kstat.h>
	#include <sys/wmsum.h>

	/*
	* This tunable disables predictive prefetch. Note that it leaves "prescient"
	* prefetch (e.g. prefetch for zfs send) intact. Unlike predictive prefetch,
	* prescient prefetch never issues i/os that end up not being needed,
	* so it can't hurt performance.
	*/

	int zfs_prefetch_disable = B_FALSE;

	/* max # of streams per zfetch */
	unsigned int zfetch_max_streams = 8;
	/* min time before stream reclaim */
	unsigned int zfetch_min_sec_reap = 2;
	/* max bytes to prefetch per stream (default 8MB) */
	unsigned int zfetch_max_distance = 8 * 1024 * 1024;
	/* max bytes to prefetch indirects for per stream (default 64MB) */
	unsigned int zfetch_max_idistance = 64 * 1024 * 1024;
	/* max number of bytes in an array_read in which we allow prefetching (1MB) */
	unsigned long zfetch_array_rd_sz = 1024 * 1024;

	typedef struct zfetch_stats {
	kstat_named_t zfetchstat_hits;
	kstat_named_t zfetchstat_misses;
	kstat_named_t zfetchstat_max_streams;
	kstat_named_t zfetchstat_io_issued;
	} zfetch_stats_t;

	static zfetch_stats_t zfetch_stats = {
	{ "hits", KSTAT_DATA_UINT64 },
	{ "misses", KSTAT_DATA_UINT64 },
	{ "max_streams", KSTAT_DATA_UINT64 },
	{ "io_issued", KSTAT_DATA_UINT64 },
	};

	struct {
	wmsum_t zfetchstat_hits;
	wmsum_t zfetchstat_misses;
	wmsum_t zfetchstat_max_streams;
	wmsum_t zfetchstat_io_issued;
	} zfetch_sums;

	#define ZFETCHSTAT_BUMP(stat) \
	wmsum_add(&zfetch_sums.stat, 1)
	#define ZFETCHSTAT_ADD(stat, val) \
	wmsum_add(&zfetch_sums.stat, val)


	kstat_t *zfetch_ksp;

	static int
	zfetch_kstats_update(kstat_t *ksp, int rw)
	{
	zfetch_stats_t *zs = ksp->ks_data;

	if (rw == KSTAT_WRITE)
	return (EACCES);
	zs->zfetchstat_hits.value.ui64 =
	wmsum_value(&zfetch_sums.zfetchstat_hits);
	zs->zfetchstat_misses.value.ui64 =
	wmsum_value(&zfetch_sums.zfetchstat_misses);
	zs->zfetchstat_max_streams.value.ui64 =
	wmsum_value(&zfetch_sums.zfetchstat_max_streams);
	zs->zfetchstat_io_issued.value.ui64 =
	wmsum_value(&zfetch_sums.zfetchstat_io_issued);
	return (0);
	}

	void
	zfetch_init(void)
	{
	wmsum_init(&zfetch_sums.zfetchstat_hits, 0);
	wmsum_init(&zfetch_sums.zfetchstat_misses, 0);
	wmsum_init(&zfetch_sums.zfetchstat_max_streams, 0);
	wmsum_init(&zfetch_sums.zfetchstat_io_issued, 0);

	zfetch_ksp = kstat_create("zfs", 0, "zfetchstats", "misc",
	KSTAT_TYPE_NAMED, sizeof (zfetch_stats) / sizeof (kstat_named_t),
	KSTAT_FLAG_VIRTUAL);

	if (zfetch_ksp != NULL) {
	zfetch_ksp->ks_data = &zfetch_stats;
	zfetch_ksp->ks_update = zfetch_kstats_update;
	kstat_install(zfetch_ksp);
	}
	}

	void
	zfetch_fini(void)
	{
	if (zfetch_ksp != NULL) {
	kstat_delete(zfetch_ksp);
	zfetch_ksp = NULL;
	}

	wmsum_fini(&zfetch_sums.zfetchstat_hits);
	wmsum_fini(&zfetch_sums.zfetchstat_misses);
	wmsum_fini(&zfetch_sums.zfetchstat_max_streams);
	wmsum_fini(&zfetch_sums.zfetchstat_io_issued);
	}

	/*
	* This takes a pointer to a zfetch structure and a dnode. It performs the
	* necessary setup for the zfetch structure, grokking data from the
	* associated dnode.
	*/
	void
	dmu_zfetch_init(zfetch_t zf, dnode_t dno)
	{
	if (zf == NULL)
	return;
	zf->zf_dnode = dno;
	zf->zf_numstreams = 0;

	list_create(&zf->zf_stream, sizeof (zstream_t),
	offsetof(zstream_t, zs_node));

	mutex_init(&zf->zf_lock, NULL, MUTEX_DEFAULT, NULL);
	}

	static void
	dmu_zfetch_stream_fini(zstream_t *zs)
	{
	ASSERT(!list_link_active(&zs->zs_node));
	+ zfs_refcount_destroy(&zs->zs_callers);
	+ zfs_refcount_destroy(&zs->zs_refs);
	kmem_free(zs, sizeof (*zs));
	}

	static void
	dmu_zfetch_stream_remove(zfetch_t zf, zstream_t zs)
	{
	ASSERT(MUTEX_HELD(&zf->zf_lock));
	list_remove(&zf->zf_stream, zs);
	zf->zf_numstreams--;
	membar_producer();
	if (zfs_refcount_remove(&zs->zs_refs, NULL) == 0)
	dmu_zfetch_stream_fini(zs);
	}

	/*
	* Clean-up state associated with a zfetch structure (e.g. destroy the
	* streams). This doesn't free the zfetch_t itself, that's left to the caller.
	*/
	void
	dmu_zfetch_fini(zfetch_t *zf)
	{
	zstream_t *zs;

	mutex_enter(&zf->zf_lock);
	while ((zs = list_head(&zf->zf_stream)) != NULL)
	dmu_zfetch_stream_remove(zf, zs);
	mutex_exit(&zf->zf_lock);
	list_destroy(&zf->zf_stream);
	mutex_destroy(&zf->zf_lock);

	zf->zf_dnode = NULL;
	}

	/*
	* If there aren't too many streams already, create a new stream.
	* The "blkid" argument is the next block that we expect this stream to access.
	* While we're here, clean up old streams (which haven't been
	* accessed for at least zfetch_min_sec_reap seconds).
	*/
	static void
	dmu_zfetch_stream_create(zfetch_t *zf, uint64_t blkid)
	{
	zstream_t *zs_next;
	hrtime_t now = gethrtime();

	ASSERT(MUTEX_HELD(&zf->zf_lock));

	/*
	* Clean up old streams.
	*/
	for (zstream_t *zs = list_head(&zf->zf_stream);
	zs != NULL; zs = zs_next) {
	zs_next = list_next(&zf->zf_stream, zs);
	/*
	* Skip if still active. 1 -- zf_stream reference.
	*/
	if (zfs_refcount_count(&zs->zs_refs) != 1)
	continue;
	if (((now - zs->zs_atime) / NANOSEC) >
	zfetch_min_sec_reap)
	dmu_zfetch_stream_remove(zf, zs);
	}

	/*
	* The maximum number of streams is normally zfetch_max_streams,
	* but for small files we lower it such that it's at least possible
	* for all the streams to be non-overlapping.
	*
	* If we are already at the maximum number of streams for this file,
	* even after removing old streams, then don't create this stream.
	*/
	uint32_t max_streams = MAX(1, MIN(zfetch_max_streams,
	zf->zf_dnode->dn_maxblkid * zf->zf_dnode->dn_datablksz /
	zfetch_max_distance));
	if (zf->zf_numstreams >= max_streams) {
	ZFETCHSTAT_BUMP(zfetchstat_max_streams);
	return;
	}

	zstream_t zs = kmem_zalloc(sizeof (zs), KM_SLEEP);
	zs->zs_blkid = blkid;
	zs->zs_pf_blkid1 = blkid;
	zs->zs_pf_blkid = blkid;
	zs->zs_ipf_blkid1 = blkid;
	zs->zs_ipf_blkid = blkid;
	zs->zs_atime = now;
	zs->zs_fetch = zf;
	zs->zs_missed = B_FALSE;
	zfs_refcount_create(&zs->zs_callers);
	zfs_refcount_create(&zs->zs_refs);
	/* One reference for zf_stream. */
	zfs_refcount_add(&zs->zs_refs, NULL);
	zf->zf_numstreams++;
	list_insert_head(&zf->zf_stream, zs);
	}

	static void
	dmu_zfetch_stream_done(void *arg, boolean_t io_issued)
	{
	zstream_t *zs = arg;

	if (zfs_refcount_remove(&zs->zs_refs, NULL) == 0)
	dmu_zfetch_stream_fini(zs);
	}

	/*
	* This is the predictive prefetch entry point. dmu_zfetch_prepare()
	* associates dnode access specified with blkid and nblks arguments with
	* prefetch stream, predicts further accesses based on that stats and returns
	* the stream pointer on success. That pointer must later be passed to
	* dmu_zfetch_run() to initiate the speculative prefetch for the stream and
	* release it. dmu_zfetch() is a wrapper for simple cases when window between
	* prediction and prefetch initiation is not needed.
	* fetch_data argument specifies whether actual data blocks should be fetched:
	* FALSE -- prefetch only indirect blocks for predicted data blocks;
	* TRUE -- prefetch predicted data blocks plus following indirect blocks.
	*/
	zstream_t *
	dmu_zfetch_prepare(zfetch_t *zf, uint64_t blkid, uint64_t nblks,
	boolean_t fetch_data, boolean_t have_lock)
	{
	zstream_t *zs;
	int64_t pf_start, ipf_start;
	int64_t pf_ahead_blks, max_blks;
	int max_dist_blks, pf_nblks, ipf_nblks;
	uint64_t end_of_access_blkid, maxblkid;
	end_of_access_blkid = blkid + nblks;
	spa_t *spa = zf->zf_dnode->dn_objset->os_spa;

	if (zfs_prefetch_disable)
	return (NULL);
	/*
	* If we haven't yet loaded the indirect vdevs' mappings, we
	* can only read from blocks that we carefully ensure are on
	* concrete vdevs (or previously-loaded indirect vdevs). So we
	* can't allow the predictive prefetcher to attempt reads of other
	* blocks (e.g. of the MOS's dnode object).
	*/
	if (!spa_indirect_vdevs_loaded(spa))
	return (NULL);

	/*
	* As a fast path for small (single-block) files, ignore access
	* to the first block.
	*/
	if (!have_lock && blkid == 0)
	return (NULL);

	if (!have_lock)
	rw_enter(&zf->zf_dnode->dn_struct_rwlock, RW_READER);

	/*
	* A fast path for small files for which no prefetch will
	* happen.
	*/
	maxblkid = zf->zf_dnode->dn_maxblkid;
	if (maxblkid < 2) {
	if (!have_lock)
	rw_exit(&zf->zf_dnode->dn_struct_rwlock);
	return (NULL);
	}
	mutex_enter(&zf->zf_lock);

	/*
	* Find matching prefetch stream. Depending on whether the accesses
	* are block-aligned, first block of the new access may either follow
	* the last block of the previous access, or be equal to it.
	*/
	for (zs = list_head(&zf->zf_stream); zs != NULL;
	zs = list_next(&zf->zf_stream, zs)) {
	if (blkid == zs->zs_blkid) {
	break;
	} else if (blkid + 1 == zs->zs_blkid) {
	blkid++;
	nblks--;
	break;
	}
	}

	/*
	* If the file is ending, remove the matching stream if found.
	* If not found then it is too late to create a new one now.
	*/
	if (end_of_access_blkid >= maxblkid) {
	if (zs != NULL)
	dmu_zfetch_stream_remove(zf, zs);
	mutex_exit(&zf->zf_lock);
	if (!have_lock)
	rw_exit(&zf->zf_dnode->dn_struct_rwlock);
	return (NULL);
	}

	/* Exit if we already prefetched this block before. */
	if (nblks == 0) {
	mutex_exit(&zf->zf_lock);
	if (!have_lock)
	rw_exit(&zf->zf_dnode->dn_struct_rwlock);
	return (NULL);
	}

	if (zs == NULL) {
	/*
	* This access is not part of any existing stream. Create
	* a new stream for it.
	*/
	dmu_zfetch_stream_create(zf, end_of_access_blkid);
	mutex_exit(&zf->zf_lock);
	if (!have_lock)
	rw_exit(&zf->zf_dnode->dn_struct_rwlock);
	ZFETCHSTAT_BUMP(zfetchstat_misses);
	return (NULL);
	}

	/*
	* This access was to a block that we issued a prefetch for on
	* behalf of this stream. Issue further prefetches for this stream.
	*
	* Normally, we start prefetching where we stopped
	* prefetching last (zs_pf_blkid). But when we get our first
	* hit on this stream, zs_pf_blkid == zs_blkid, we don't
	* want to prefetch the block we just accessed. In this case,
	* start just after the block we just accessed.
	*/
	pf_start = MAX(zs->zs_pf_blkid, end_of_access_blkid);
	if (zs->zs_pf_blkid1 < end_of_access_blkid)
	zs->zs_pf_blkid1 = end_of_access_blkid;
	if (zs->zs_ipf_blkid1 < end_of_access_blkid)
	zs->zs_ipf_blkid1 = end_of_access_blkid;

	/*
	* Double our amount of prefetched data, but don't let the
	* prefetch get further ahead than zfetch_max_distance.
	*/
	if (fetch_data) {
	max_dist_blks =
	zfetch_max_distance >> zf->zf_dnode->dn_datablkshift;
	/*
	* Previously, we were (zs_pf_blkid - blkid) ahead. We
	* want to now be double that, so read that amount again,
	* plus the amount we are catching up by (i.e. the amount
	* read just now).
	*/
	pf_ahead_blks = zs->zs_pf_blkid - blkid + nblks;
	max_blks = max_dist_blks - (pf_start - end_of_access_blkid);
	pf_nblks = MIN(pf_ahead_blks, max_blks);
	} else {
	pf_nblks = 0;
	}

	zs->zs_pf_blkid = pf_start + pf_nblks;

	/*
	* Do the same for indirects, starting from where we stopped last,
	* or where we will stop reading data blocks (and the indirects
	* that point to them).
	*/
	ipf_start = MAX(zs->zs_ipf_blkid, zs->zs_pf_blkid);
	max_dist_blks = zfetch_max_idistance >> zf->zf_dnode->dn_datablkshift;
	/*
	* We want to double our distance ahead of the data prefetch
	* (or reader, if we are not prefetching data). Previously, we
	* were (zs_ipf_blkid - blkid) ahead. To double that, we read
	* that amount again, plus the amount we are catching up by
	* (i.e. the amount read now + the amount of data prefetched now).
	*/
	pf_ahead_blks = zs->zs_ipf_blkid - blkid + nblks + pf_nblks;
	max_blks = max_dist_blks - (ipf_start - zs->zs_pf_blkid);
	ipf_nblks = MIN(pf_ahead_blks, max_blks);
	zs->zs_ipf_blkid = ipf_start + ipf_nblks;

	zs->zs_blkid = end_of_access_blkid;
	/* Protect the stream from reclamation. */
	zs->zs_atime = gethrtime();
	zfs_refcount_add(&zs->zs_refs, NULL);
	/* Count concurrent callers. */
	zfs_refcount_add(&zs->zs_callers, NULL);
	mutex_exit(&zf->zf_lock);

	if (!have_lock)
	rw_exit(&zf->zf_dnode->dn_struct_rwlock);

	ZFETCHSTAT_BUMP(zfetchstat_hits);
	return (zs);
	}

	void
	dmu_zfetch_run(zstream_t *zs, boolean_t missed, boolean_t have_lock)
	{
	zfetch_t *zf = zs->zs_fetch;
	int64_t pf_start, pf_end, ipf_start, ipf_end;
	int epbs, issued;

	if (missed)
	zs->zs_missed = missed;

	/*
	* Postpone the prefetch if there are more concurrent callers.
	* It happens when multiple requests are waiting for the same
	* indirect block. The last one will run the prefetch for all.
	*/
	if (zfs_refcount_remove(&zs->zs_callers, NULL) != 0) {
	/* Drop reference taken in dmu_zfetch_prepare(). */
	if (zfs_refcount_remove(&zs->zs_refs, NULL) == 0)
	dmu_zfetch_stream_fini(zs);
	return;
	}

	mutex_enter(&zf->zf_lock);
	if (zs->zs_missed) {
	pf_start = zs->zs_pf_blkid1;
	pf_end = zs->zs_pf_blkid1 = zs->zs_pf_blkid;
	} else {
	pf_start = pf_end = 0;
	}
	ipf_start = MAX(zs->zs_pf_blkid1, zs->zs_ipf_blkid1);
	ipf_end = zs->zs_ipf_blkid1 = zs->zs_ipf_blkid;
	mutex_exit(&zf->zf_lock);
	ASSERT3S(pf_start, <=, pf_end);
	ASSERT3S(ipf_start, <=, ipf_end);

	epbs = zf->zf_dnode->dn_indblkshift - SPA_BLKPTRSHIFT;
	ipf_start = P2ROUNDUP(ipf_start, 1 << epbs) >> epbs;
	ipf_end = P2ROUNDUP(ipf_end, 1 << epbs) >> epbs;
	ASSERT3S(ipf_start, <=, ipf_end);
	issued = pf_end - pf_start + ipf_end - ipf_start;
	if (issued > 1) {
	/* More references on top of taken in dmu_zfetch_prepare(). */
	zfs_refcount_add_many(&zs->zs_refs, issued - 1, NULL);
	} else if (issued == 0) {
	/* Some other thread has done our work, so drop the ref. */
	if (zfs_refcount_remove(&zs->zs_refs, NULL) == 0)
	dmu_zfetch_stream_fini(zs);
	return;
	}

	if (!have_lock)
	rw_enter(&zf->zf_dnode->dn_struct_rwlock, RW_READER);

	issued = 0;
	for (int64_t blk = pf_start; blk < pf_end; blk++) {
	issued += dbuf_prefetch_impl(zf->zf_dnode, 0, blk,
	ZIO_PRIORITY_ASYNC_READ, ARC_FLAG_PREDICTIVE_PREFETCH,
	dmu_zfetch_stream_done, zs);
	}
	for (int64_t iblk = ipf_start; iblk < ipf_end; iblk++) {
	issued += dbuf_prefetch_impl(zf->zf_dnode, 1, iblk,
	ZIO_PRIORITY_ASYNC_READ, ARC_FLAG_PREDICTIVE_PREFETCH,
	dmu_zfetch_stream_done, zs);
	}

	if (!have_lock)
	rw_exit(&zf->zf_dnode->dn_struct_rwlock);

	if (issued)
	ZFETCHSTAT_ADD(zfetchstat_io_issued, issued);
	}

	void
	dmu_zfetch(zfetch_t *zf, uint64_t blkid, uint64_t nblks, boolean_t fetch_data,
	boolean_t missed, boolean_t have_lock)
	{
	zstream_t *zs;

	zs = dmu_zfetch_prepare(zf, blkid, nblks, fetch_data, have_lock);
	if (zs)
	dmu_zfetch_run(zs, missed, have_lock);
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_prefetch, zfs_prefetch_, disable, INT, ZMOD_RW,
	"Disable all ZFS prefetching");

	ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, max_streams, UINT, ZMOD_RW,
	"Max number of streams per zfetch");

	ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, min_sec_reap, UINT, ZMOD_RW,
	"Min time before stream reclaim");

	ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, max_distance, UINT, ZMOD_RW,
	"Max bytes to prefetch per stream");

	ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, max_idistance, UINT, ZMOD_RW,
	"Max bytes to prefetch indirects for per stream");

	ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, array_rd_sz, ULONG, ZMOD_RW,
	"Number of bytes in a array_read");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/dnode.c b/sys/contrib/openzfs/module/zfs/dnode.c
	index b1813a8951d5..7f741542ce02 100644
	--- a/sys/contrib/openzfs/module/zfs/dnode.c
	+++ b/sys/contrib/openzfs/module/zfs/dnode.c
	@@ -1,2579 +1,2580 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/dbuf.h>
	#include <sys/dnode.h>
	#include <sys/dmu.h>
	#include <sys/dmu_impl.h>
	#include <sys/dmu_tx.h>
	#include <sys/dmu_objset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_dataset.h>
	#include <sys/spa.h>
	#include <sys/zio.h>
	#include <sys/dmu_zfetch.h>
	#include <sys/range_tree.h>
	#include <sys/trace_zfs.h>
	#include <sys/zfs_project.h>

	dnode_stats_t dnode_stats = {
	{ "dnode_hold_dbuf_hold", KSTAT_DATA_UINT64 },
	{ "dnode_hold_dbuf_read", KSTAT_DATA_UINT64 },
	{ "dnode_hold_alloc_hits", KSTAT_DATA_UINT64 },
	{ "dnode_hold_alloc_misses", KSTAT_DATA_UINT64 },
	{ "dnode_hold_alloc_interior", KSTAT_DATA_UINT64 },
	{ "dnode_hold_alloc_lock_retry", KSTAT_DATA_UINT64 },
	{ "dnode_hold_alloc_lock_misses", KSTAT_DATA_UINT64 },
	{ "dnode_hold_alloc_type_none", KSTAT_DATA_UINT64 },
	{ "dnode_hold_free_hits", KSTAT_DATA_UINT64 },
	{ "dnode_hold_free_misses", KSTAT_DATA_UINT64 },
	{ "dnode_hold_free_lock_misses", KSTAT_DATA_UINT64 },
	{ "dnode_hold_free_lock_retry", KSTAT_DATA_UINT64 },
	{ "dnode_hold_free_overflow", KSTAT_DATA_UINT64 },
	{ "dnode_hold_free_refcount", KSTAT_DATA_UINT64 },
	{ "dnode_free_interior_lock_retry", KSTAT_DATA_UINT64 },
	{ "dnode_allocate", KSTAT_DATA_UINT64 },
	{ "dnode_reallocate", KSTAT_DATA_UINT64 },
	{ "dnode_buf_evict", KSTAT_DATA_UINT64 },
	{ "dnode_alloc_next_chunk", KSTAT_DATA_UINT64 },
	{ "dnode_alloc_race", KSTAT_DATA_UINT64 },
	{ "dnode_alloc_next_block", KSTAT_DATA_UINT64 },
	{ "dnode_move_invalid", KSTAT_DATA_UINT64 },
	{ "dnode_move_recheck1", KSTAT_DATA_UINT64 },
	{ "dnode_move_recheck2", KSTAT_DATA_UINT64 },
	{ "dnode_move_special", KSTAT_DATA_UINT64 },
	{ "dnode_move_handle", KSTAT_DATA_UINT64 },
	{ "dnode_move_rwlock", KSTAT_DATA_UINT64 },
	{ "dnode_move_active", KSTAT_DATA_UINT64 },
	};

	static kstat_t *dnode_ksp;
	static kmem_cache_t *dnode_cache;

	static dnode_phys_t dnode_phys_zero __maybe_unused;

	int zfs_default_bs = SPA_MINBLOCKSHIFT;
	int zfs_default_ibs = DN_MAX_INDBLKSHIFT;

	#ifdef _KERNEL
	static kmem_cbrc_t dnode_move(void , void , size_t, void *);
	#endif /* _KERNEL */

	static int
	dbuf_compare(const void x1, const void x2)
	{
	const dmu_buf_impl_t *d1 = x1;
	const dmu_buf_impl_t *d2 = x2;

	int cmp = TREE_CMP(d1->db_level, d2->db_level);
	if (likely(cmp))
	return (cmp);

	cmp = TREE_CMP(d1->db_blkid, d2->db_blkid);
	if (likely(cmp))
	return (cmp);

	if (d1->db_state == DB_SEARCH) {
	ASSERT3S(d2->db_state, !=, DB_SEARCH);
	return (-1);
	} else if (d2->db_state == DB_SEARCH) {
	ASSERT3S(d1->db_state, !=, DB_SEARCH);
	return (1);
	}

	return (TREE_PCMP(d1, d2));
	}

	/* ARGSUSED */
	static int
	dnode_cons(void arg, void unused, int kmflag)
	{
	dnode_t *dn = arg;
	int i;

	rw_init(&dn->dn_struct_rwlock, NULL, RW_NOLOCKDEP, NULL);
	mutex_init(&dn->dn_mtx, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&dn->dn_dbufs_mtx, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&dn->dn_notxholds, NULL, CV_DEFAULT, NULL);
	cv_init(&dn->dn_nodnholds, NULL, CV_DEFAULT, NULL);

	/*
	* Every dbuf has a reference, and dropping a tracked reference is
	* O(number of references), so don't track dn_holds.
	*/
	zfs_refcount_create_untracked(&dn->dn_holds);
	zfs_refcount_create(&dn->dn_tx_holds);
	list_link_init(&dn->dn_link);

	+ bzero(&dn->dn_next_type[0], sizeof (dn->dn_next_type));
	bzero(&dn->dn_next_nblkptr[0], sizeof (dn->dn_next_nblkptr));
	bzero(&dn->dn_next_nlevels[0], sizeof (dn->dn_next_nlevels));
	bzero(&dn->dn_next_indblkshift[0], sizeof (dn->dn_next_indblkshift));
	bzero(&dn->dn_next_bonustype[0], sizeof (dn->dn_next_bonustype));
	bzero(&dn->dn_rm_spillblk[0], sizeof (dn->dn_rm_spillblk));
	bzero(&dn->dn_next_bonuslen[0], sizeof (dn->dn_next_bonuslen));
	bzero(&dn->dn_next_blksz[0], sizeof (dn->dn_next_blksz));
	bzero(&dn->dn_next_maxblkid[0], sizeof (dn->dn_next_maxblkid));

	for (i = 0; i < TXG_SIZE; i++) {
	multilist_link_init(&dn->dn_dirty_link[i]);
	dn->dn_free_ranges[i] = NULL;
	list_create(&dn->dn_dirty_records[i],
	sizeof (dbuf_dirty_record_t),
	offsetof(dbuf_dirty_record_t, dr_dirty_node));
	}

	dn->dn_allocated_txg = 0;
	dn->dn_free_txg = 0;
	dn->dn_assigned_txg = 0;
	dn->dn_dirty_txg = 0;
	dn->dn_dirtyctx = 0;
	dn->dn_dirtyctx_firstset = NULL;
	dn->dn_bonus = NULL;
	dn->dn_have_spill = B_FALSE;
	dn->dn_zio = NULL;
	dn->dn_oldused = 0;
	dn->dn_oldflags = 0;
	dn->dn_olduid = 0;
	dn->dn_oldgid = 0;
	dn->dn_oldprojid = ZFS_DEFAULT_PROJID;
	dn->dn_newuid = 0;
	dn->dn_newgid = 0;
	dn->dn_newprojid = ZFS_DEFAULT_PROJID;
	dn->dn_id_flags = 0;

	dn->dn_dbufs_count = 0;
	avl_create(&dn->dn_dbufs, dbuf_compare, sizeof (dmu_buf_impl_t),
	offsetof(dmu_buf_impl_t, db_link));

	dn->dn_moved = 0;
	return (0);
	}

	/* ARGSUSED */
	static void
	dnode_dest(void arg, void unused)
	{
	int i;
	dnode_t *dn = arg;

	rw_destroy(&dn->dn_struct_rwlock);
	mutex_destroy(&dn->dn_mtx);
	mutex_destroy(&dn->dn_dbufs_mtx);
	cv_destroy(&dn->dn_notxholds);
	cv_destroy(&dn->dn_nodnholds);
	zfs_refcount_destroy(&dn->dn_holds);
	zfs_refcount_destroy(&dn->dn_tx_holds);
	ASSERT(!list_link_active(&dn->dn_link));

	for (i = 0; i < TXG_SIZE; i++) {
	ASSERT(!multilist_link_active(&dn->dn_dirty_link[i]));
	ASSERT3P(dn->dn_free_ranges[i], ==, NULL);
	list_destroy(&dn->dn_dirty_records[i]);
	ASSERT0(dn->dn_next_nblkptr[i]);
	ASSERT0(dn->dn_next_nlevels[i]);
	ASSERT0(dn->dn_next_indblkshift[i]);
	ASSERT0(dn->dn_next_bonustype[i]);
	ASSERT0(dn->dn_rm_spillblk[i]);
	ASSERT0(dn->dn_next_bonuslen[i]);
	ASSERT0(dn->dn_next_blksz[i]);
	ASSERT0(dn->dn_next_maxblkid[i]);
	}

	ASSERT0(dn->dn_allocated_txg);
	ASSERT0(dn->dn_free_txg);
	ASSERT0(dn->dn_assigned_txg);
	ASSERT0(dn->dn_dirty_txg);
	ASSERT0(dn->dn_dirtyctx);
	ASSERT3P(dn->dn_dirtyctx_firstset, ==, NULL);
	ASSERT3P(dn->dn_bonus, ==, NULL);
	ASSERT(!dn->dn_have_spill);
	ASSERT3P(dn->dn_zio, ==, NULL);
	ASSERT0(dn->dn_oldused);
	ASSERT0(dn->dn_oldflags);
	ASSERT0(dn->dn_olduid);
	ASSERT0(dn->dn_oldgid);
	ASSERT0(dn->dn_oldprojid);
	ASSERT0(dn->dn_newuid);
	ASSERT0(dn->dn_newgid);
	ASSERT0(dn->dn_newprojid);
	ASSERT0(dn->dn_id_flags);

	ASSERT0(dn->dn_dbufs_count);
	avl_destroy(&dn->dn_dbufs);
	}

	void
	dnode_init(void)
	{
	ASSERT(dnode_cache == NULL);
	dnode_cache = kmem_cache_create("dnode_t", sizeof (dnode_t),
	0, dnode_cons, dnode_dest, NULL, NULL, NULL, 0);
	kmem_cache_set_move(dnode_cache, dnode_move);

	dnode_ksp = kstat_create("zfs", 0, "dnodestats", "misc",
	KSTAT_TYPE_NAMED, sizeof (dnode_stats) / sizeof (kstat_named_t),
	KSTAT_FLAG_VIRTUAL);
	if (dnode_ksp != NULL) {
	dnode_ksp->ks_data = &dnode_stats;
	kstat_install(dnode_ksp);
	}
	}

	void
	dnode_fini(void)
	{
	if (dnode_ksp != NULL) {
	kstat_delete(dnode_ksp);
	dnode_ksp = NULL;
	}

	kmem_cache_destroy(dnode_cache);
	dnode_cache = NULL;
	}


	#ifdef ZFS_DEBUG
	void
	dnode_verify(dnode_t *dn)
	{
	int drop_struct_lock = FALSE;

	ASSERT(dn->dn_phys);
	ASSERT(dn->dn_objset);
	ASSERT(dn->dn_handle->dnh_dnode == dn);

	ASSERT(DMU_OT_IS_VALID(dn->dn_phys->dn_type));

	if (!(zfs_flags & ZFS_DEBUG_DNODE_VERIFY))
	return;

	if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) {
	rw_enter(&dn->dn_struct_rwlock, RW_READER);
	drop_struct_lock = TRUE;
	}
	if (dn->dn_phys->dn_type != DMU_OT_NONE \|\| dn->dn_allocated_txg != 0) {
	int i;
	int max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
	ASSERT3U(dn->dn_indblkshift, <=, SPA_MAXBLOCKSHIFT);
	if (dn->dn_datablkshift) {
	ASSERT3U(dn->dn_datablkshift, >=, SPA_MINBLOCKSHIFT);
	ASSERT3U(dn->dn_datablkshift, <=, SPA_MAXBLOCKSHIFT);
	ASSERT3U(1<<dn->dn_datablkshift, ==, dn->dn_datablksz);
	}
	ASSERT3U(dn->dn_nlevels, <=, 30);
	ASSERT(DMU_OT_IS_VALID(dn->dn_type));
	ASSERT3U(dn->dn_nblkptr, >=, 1);
	ASSERT3U(dn->dn_nblkptr, <=, DN_MAX_NBLKPTR);
	ASSERT3U(dn->dn_bonuslen, <=, max_bonuslen);
	ASSERT3U(dn->dn_datablksz, ==,
	dn->dn_datablkszsec << SPA_MINBLOCKSHIFT);
	ASSERT3U(ISP2(dn->dn_datablksz), ==, dn->dn_datablkshift != 0);
	ASSERT3U((dn->dn_nblkptr - 1) * sizeof (blkptr_t) +
	dn->dn_bonuslen, <=, max_bonuslen);
	for (i = 0; i < TXG_SIZE; i++) {
	ASSERT3U(dn->dn_next_nlevels[i], <=, dn->dn_nlevels);
	}
	}
	if (dn->dn_phys->dn_type != DMU_OT_NONE)
	ASSERT3U(dn->dn_phys->dn_nlevels, <=, dn->dn_nlevels);
	ASSERT(DMU_OBJECT_IS_SPECIAL(dn->dn_object) \|\| dn->dn_dbuf != NULL);
	if (dn->dn_dbuf != NULL) {
	ASSERT3P(dn->dn_phys, ==,
	(dnode_phys_t *)dn->dn_dbuf->db.db_data +
	(dn->dn_object % (dn->dn_dbuf->db.db_size >> DNODE_SHIFT)));
	}
	if (drop_struct_lock)
	rw_exit(&dn->dn_struct_rwlock);
	}
	#endif

	void
	dnode_byteswap(dnode_phys_t *dnp)
	{
	uint64_t buf64 = (void)&dnp->dn_blkptr;
	int i;

	if (dnp->dn_type == DMU_OT_NONE) {
	bzero(dnp, sizeof (dnode_phys_t));
	return;
	}

	dnp->dn_datablkszsec = BSWAP_16(dnp->dn_datablkszsec);
	dnp->dn_bonuslen = BSWAP_16(dnp->dn_bonuslen);
	dnp->dn_extra_slots = BSWAP_8(dnp->dn_extra_slots);
	dnp->dn_maxblkid = BSWAP_64(dnp->dn_maxblkid);
	dnp->dn_used = BSWAP_64(dnp->dn_used);

	/*
	* dn_nblkptr is only one byte, so it's OK to read it in either
	* byte order. We can't read dn_bouslen.
	*/
	ASSERT(dnp->dn_indblkshift <= SPA_MAXBLOCKSHIFT);
	ASSERT(dnp->dn_nblkptr <= DN_MAX_NBLKPTR);
	for (i = 0; i < dnp->dn_nblkptr * sizeof (blkptr_t)/8; i++)
	buf64[i] = BSWAP_64(buf64[i]);

	/*
	* OK to check dn_bonuslen for zero, because it won't matter if
	* we have the wrong byte order. This is necessary because the
	* dnode dnode is smaller than a regular dnode.
	*/
	if (dnp->dn_bonuslen != 0) {
	/*
	* Note that the bonus length calculated here may be
	* longer than the actual bonus buffer. This is because
	* we always put the bonus buffer after the last block
	* pointer (instead of packing it against the end of the
	* dnode buffer).
	*/
	int off = (dnp->dn_nblkptr-1) * sizeof (blkptr_t);
	int slots = dnp->dn_extra_slots + 1;
	size_t len = DN_SLOTS_TO_BONUSLEN(slots) - off;
	dmu_object_byteswap_t byteswap;
	ASSERT(DMU_OT_IS_VALID(dnp->dn_bonustype));
	byteswap = DMU_OT_BYTESWAP(dnp->dn_bonustype);
	dmu_ot_byteswap[byteswap].ob_func(dnp->dn_bonus + off, len);
	}

	/* Swap SPILL block if we have one */
	if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)
	byteswap_uint64_array(DN_SPILL_BLKPTR(dnp), sizeof (blkptr_t));
	}

	void
	dnode_buf_byteswap(void *vbuf, size_t size)
	{
	int i = 0;

	ASSERT3U(sizeof (dnode_phys_t), ==, (1<<DNODE_SHIFT));
	ASSERT((size & (sizeof (dnode_phys_t)-1)) == 0);

	while (i < size) {
	dnode_phys_t dnp = (void )(((char *)vbuf) + i);
	dnode_byteswap(dnp);

	i += DNODE_MIN_SIZE;
	if (dnp->dn_type != DMU_OT_NONE)
	i += dnp->dn_extra_slots * DNODE_MIN_SIZE;
	}
	}

	void
	dnode_setbonuslen(dnode_t dn, int newsize, dmu_tx_t tx)
	{
	ASSERT3U(zfs_refcount_count(&dn->dn_holds), >=, 1);

	dnode_setdirty(dn, tx);
	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
	ASSERT3U(newsize, <=, DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots) -
	(dn->dn_nblkptr-1) * sizeof (blkptr_t));

	if (newsize < dn->dn_bonuslen) {
	/* clear any data after the end of the new size */
	size_t diff = dn->dn_bonuslen - newsize;
	char data_end = ((char )dn->dn_bonus->db.db_data) + newsize;
	bzero(data_end, diff);
	}

	dn->dn_bonuslen = newsize;
	if (newsize == 0)
	dn->dn_next_bonuslen[tx->tx_txg & TXG_MASK] = DN_ZERO_BONUSLEN;
	else
	dn->dn_next_bonuslen[tx->tx_txg & TXG_MASK] = dn->dn_bonuslen;
	rw_exit(&dn->dn_struct_rwlock);
	}

	void
	dnode_setbonus_type(dnode_t dn, dmu_object_type_t newtype, dmu_tx_t tx)
	{
	ASSERT3U(zfs_refcount_count(&dn->dn_holds), >=, 1);
	dnode_setdirty(dn, tx);
	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
	dn->dn_bonustype = newtype;
	dn->dn_next_bonustype[tx->tx_txg & TXG_MASK] = dn->dn_bonustype;
	rw_exit(&dn->dn_struct_rwlock);
	}

	void
	dnode_rm_spill(dnode_t dn, dmu_tx_t tx)
	{
	ASSERT3U(zfs_refcount_count(&dn->dn_holds), >=, 1);
	ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock));
	dnode_setdirty(dn, tx);
	dn->dn_rm_spillblk[tx->tx_txg & TXG_MASK] = DN_KILL_SPILLBLK;
	dn->dn_have_spill = B_FALSE;
	}

	static void
	dnode_setdblksz(dnode_t *dn, int size)
	{
	ASSERT0(P2PHASE(size, SPA_MINBLOCKSIZE));
	ASSERT3U(size, <=, SPA_MAXBLOCKSIZE);
	ASSERT3U(size, >=, SPA_MINBLOCKSIZE);
	ASSERT3U(size >> SPA_MINBLOCKSHIFT, <,
	1<<(sizeof (dn->dn_phys->dn_datablkszsec) * 8));
	dn->dn_datablksz = size;
	dn->dn_datablkszsec = size >> SPA_MINBLOCKSHIFT;
	dn->dn_datablkshift = ISP2(size) ? highbit64(size - 1) : 0;
	}

	static dnode_t *
	dnode_create(objset_t os, dnode_phys_t dnp, dmu_buf_impl_t *db,
	uint64_t object, dnode_handle_t *dnh)
	{
	dnode_t *dn;

	dn = kmem_cache_alloc(dnode_cache, KM_SLEEP);
	dn->dn_moved = 0;

	/*
	* Defer setting dn_objset until the dnode is ready to be a candidate
	* for the dnode_move() callback.
	*/
	dn->dn_object = object;
	dn->dn_dbuf = db;
	dn->dn_handle = dnh;
	dn->dn_phys = dnp;

	if (dnp->dn_datablkszsec) {
	dnode_setdblksz(dn, dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
	} else {
	dn->dn_datablksz = 0;
	dn->dn_datablkszsec = 0;
	dn->dn_datablkshift = 0;
	}
	dn->dn_indblkshift = dnp->dn_indblkshift;
	dn->dn_nlevels = dnp->dn_nlevels;
	dn->dn_type = dnp->dn_type;
	dn->dn_nblkptr = dnp->dn_nblkptr;
	dn->dn_checksum = dnp->dn_checksum;
	dn->dn_compress = dnp->dn_compress;
	dn->dn_bonustype = dnp->dn_bonustype;
	dn->dn_bonuslen = dnp->dn_bonuslen;
	dn->dn_num_slots = dnp->dn_extra_slots + 1;
	dn->dn_maxblkid = dnp->dn_maxblkid;
	dn->dn_have_spill = ((dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) != 0);
	dn->dn_id_flags = 0;

	dmu_zfetch_init(&dn->dn_zfetch, dn);

	ASSERT(DMU_OT_IS_VALID(dn->dn_phys->dn_type));
	ASSERT(zrl_is_locked(&dnh->dnh_zrlock));
	ASSERT(!DN_SLOT_IS_PTR(dnh->dnh_dnode));

	mutex_enter(&os->os_lock);

	/*
	* Exclude special dnodes from os_dnodes so an empty os_dnodes
	* signifies that the special dnodes have no references from
	* their children (the entries in os_dnodes). This allows
	* dnode_destroy() to easily determine if the last child has
	* been removed and then complete eviction of the objset.
	*/
	if (!DMU_OBJECT_IS_SPECIAL(object))
	list_insert_head(&os->os_dnodes, dn);
	membar_producer();

	/*
	* Everything else must be valid before assigning dn_objset
	* makes the dnode eligible for dnode_move().
	*/
	dn->dn_objset = os;

	dnh->dnh_dnode = dn;
	mutex_exit(&os->os_lock);

	arc_space_consume(sizeof (dnode_t), ARC_SPACE_DNODE);

	return (dn);
	}

	/*
	* Caller must be holding the dnode handle, which is released upon return.
	*/
	static void
	dnode_destroy(dnode_t *dn)
	{
	objset_t *os = dn->dn_objset;
	boolean_t complete_os_eviction = B_FALSE;

	ASSERT((dn->dn_id_flags & DN_ID_NEW_EXIST) == 0);

	mutex_enter(&os->os_lock);
	POINTER_INVALIDATE(&dn->dn_objset);
	if (!DMU_OBJECT_IS_SPECIAL(dn->dn_object)) {
	list_remove(&os->os_dnodes, dn);
	complete_os_eviction =
	list_is_empty(&os->os_dnodes) &&
	list_link_active(&os->os_evicting_node);
	}
	mutex_exit(&os->os_lock);

	/* the dnode can no longer move, so we can release the handle */
	if (!zrl_is_locked(&dn->dn_handle->dnh_zrlock))
	zrl_remove(&dn->dn_handle->dnh_zrlock);

	dn->dn_allocated_txg = 0;
	dn->dn_free_txg = 0;
	dn->dn_assigned_txg = 0;
	dn->dn_dirty_txg = 0;

	dn->dn_dirtyctx = 0;
	dn->dn_dirtyctx_firstset = NULL;
	if (dn->dn_bonus != NULL) {
	mutex_enter(&dn->dn_bonus->db_mtx);
	dbuf_destroy(dn->dn_bonus);
	dn->dn_bonus = NULL;
	}
	dn->dn_zio = NULL;

	dn->dn_have_spill = B_FALSE;
	dn->dn_oldused = 0;
	dn->dn_oldflags = 0;
	dn->dn_olduid = 0;
	dn->dn_oldgid = 0;
	dn->dn_oldprojid = ZFS_DEFAULT_PROJID;
	dn->dn_newuid = 0;
	dn->dn_newgid = 0;
	dn->dn_newprojid = ZFS_DEFAULT_PROJID;
	dn->dn_id_flags = 0;

	dmu_zfetch_fini(&dn->dn_zfetch);
	kmem_cache_free(dnode_cache, dn);
	arc_space_return(sizeof (dnode_t), ARC_SPACE_DNODE);

	if (complete_os_eviction)
	dmu_objset_evict_done(os);
	}

	void
	dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs,
	dmu_object_type_t bonustype, int bonuslen, int dn_slots, dmu_tx_t *tx)
	{
	int i;

	ASSERT3U(dn_slots, >, 0);
	ASSERT3U(dn_slots << DNODE_SHIFT, <=,
	spa_maxdnodesize(dmu_objset_spa(dn->dn_objset)));
	ASSERT3U(blocksize, <=,
	spa_maxblocksize(dmu_objset_spa(dn->dn_objset)));
	if (blocksize == 0)
	blocksize = 1 << zfs_default_bs;
	else
	blocksize = P2ROUNDUP(blocksize, SPA_MINBLOCKSIZE);

	if (ibs == 0)
	ibs = zfs_default_ibs;

	ibs = MIN(MAX(ibs, DN_MIN_INDBLKSHIFT), DN_MAX_INDBLKSHIFT);

	dprintf("os=%p obj=%llu txg=%llu blocksize=%d ibs=%d dn_slots=%d\n",
	dn->dn_objset, (u_longlong_t)dn->dn_object,
	(u_longlong_t)tx->tx_txg, blocksize, ibs, dn_slots);
	DNODE_STAT_BUMP(dnode_allocate);

	ASSERT(dn->dn_type == DMU_OT_NONE);
	ASSERT(bcmp(dn->dn_phys, &dnode_phys_zero, sizeof (dnode_phys_t)) == 0);
	ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE);
	ASSERT(ot != DMU_OT_NONE);
	ASSERT(DMU_OT_IS_VALID(ot));
	ASSERT((bonustype == DMU_OT_NONE && bonuslen == 0) \|\|
	(bonustype == DMU_OT_SA && bonuslen == 0) \|\|
	(bonustype != DMU_OT_NONE && bonuslen != 0));
	ASSERT(DMU_OT_IS_VALID(bonustype));
	ASSERT3U(bonuslen, <=, DN_SLOTS_TO_BONUSLEN(dn_slots));
	ASSERT(dn->dn_type == DMU_OT_NONE);
	ASSERT0(dn->dn_maxblkid);
	ASSERT0(dn->dn_allocated_txg);
	ASSERT0(dn->dn_assigned_txg);
	ASSERT(zfs_refcount_is_zero(&dn->dn_tx_holds));
	ASSERT3U(zfs_refcount_count(&dn->dn_holds), <=, 1);
	ASSERT(avl_is_empty(&dn->dn_dbufs));

	for (i = 0; i < TXG_SIZE; i++) {
	ASSERT0(dn->dn_next_nblkptr[i]);
	ASSERT0(dn->dn_next_nlevels[i]);
	ASSERT0(dn->dn_next_indblkshift[i]);
	ASSERT0(dn->dn_next_bonuslen[i]);
	ASSERT0(dn->dn_next_bonustype[i]);
	ASSERT0(dn->dn_rm_spillblk[i]);
	ASSERT0(dn->dn_next_blksz[i]);
	ASSERT0(dn->dn_next_maxblkid[i]);
	ASSERT(!multilist_link_active(&dn->dn_dirty_link[i]));
	ASSERT3P(list_head(&dn->dn_dirty_records[i]), ==, NULL);
	ASSERT3P(dn->dn_free_ranges[i], ==, NULL);
	}

	dn->dn_type = ot;
	dnode_setdblksz(dn, blocksize);
	dn->dn_indblkshift = ibs;
	dn->dn_nlevels = 1;
	dn->dn_num_slots = dn_slots;
	if (bonustype == DMU_OT_SA) /* Maximize bonus space for SA */
	dn->dn_nblkptr = 1;
	else {
	dn->dn_nblkptr = MIN(DN_MAX_NBLKPTR,
	1 + ((DN_SLOTS_TO_BONUSLEN(dn_slots) - bonuslen) >>
	SPA_BLKPTRSHIFT));
	}

	dn->dn_bonustype = bonustype;
	dn->dn_bonuslen = bonuslen;
	dn->dn_checksum = ZIO_CHECKSUM_INHERIT;
	dn->dn_compress = ZIO_COMPRESS_INHERIT;
	dn->dn_dirtyctx = 0;

	dn->dn_free_txg = 0;
	dn->dn_dirtyctx_firstset = NULL;
	dn->dn_dirty_txg = 0;

	dn->dn_allocated_txg = tx->tx_txg;
	dn->dn_id_flags = 0;

	dnode_setdirty(dn, tx);
	dn->dn_next_indblkshift[tx->tx_txg & TXG_MASK] = ibs;
	dn->dn_next_bonuslen[tx->tx_txg & TXG_MASK] = dn->dn_bonuslen;
	dn->dn_next_bonustype[tx->tx_txg & TXG_MASK] = dn->dn_bonustype;
	dn->dn_next_blksz[tx->tx_txg & TXG_MASK] = dn->dn_datablksz;
	}

	void
	dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize,
	dmu_object_type_t bonustype, int bonuslen, int dn_slots,
	boolean_t keep_spill, dmu_tx_t *tx)
	{
	int nblkptr;

	ASSERT3U(blocksize, >=, SPA_MINBLOCKSIZE);
	ASSERT3U(blocksize, <=,
	spa_maxblocksize(dmu_objset_spa(dn->dn_objset)));
	ASSERT0(blocksize % SPA_MINBLOCKSIZE);
	ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT \|\| dmu_tx_private_ok(tx));
	ASSERT(tx->tx_txg != 0);
	ASSERT((bonustype == DMU_OT_NONE && bonuslen == 0) \|\|
	(bonustype != DMU_OT_NONE && bonuslen != 0) \|\|
	(bonustype == DMU_OT_SA && bonuslen == 0));
	ASSERT(DMU_OT_IS_VALID(bonustype));
	ASSERT3U(bonuslen, <=,
	DN_BONUS_SIZE(spa_maxdnodesize(dmu_objset_spa(dn->dn_objset))));
	ASSERT3U(bonuslen, <=, DN_BONUS_SIZE(dn_slots << DNODE_SHIFT));

	dnode_free_interior_slots(dn);
	DNODE_STAT_BUMP(dnode_reallocate);

	/* clean up any unreferenced dbufs */
	dnode_evict_dbufs(dn);

	dn->dn_id_flags = 0;

	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
	dnode_setdirty(dn, tx);
	if (dn->dn_datablksz != blocksize) {
	/* change blocksize */
	ASSERT0(dn->dn_maxblkid);
	ASSERT(BP_IS_HOLE(&dn->dn_phys->dn_blkptr[0]) \|\|
	dnode_block_freed(dn, 0));

	dnode_setdblksz(dn, blocksize);
	dn->dn_next_blksz[tx->tx_txg & TXG_MASK] = blocksize;
	}
	if (dn->dn_bonuslen != bonuslen)
	dn->dn_next_bonuslen[tx->tx_txg & TXG_MASK] = bonuslen;

	if (bonustype == DMU_OT_SA) /* Maximize bonus space for SA */
	nblkptr = 1;
	else
	nblkptr = MIN(DN_MAX_NBLKPTR,
	1 + ((DN_SLOTS_TO_BONUSLEN(dn_slots) - bonuslen) >>
	SPA_BLKPTRSHIFT));
	if (dn->dn_bonustype != bonustype)
	dn->dn_next_bonustype[tx->tx_txg & TXG_MASK] = bonustype;
	if (dn->dn_nblkptr != nblkptr)
	dn->dn_next_nblkptr[tx->tx_txg & TXG_MASK] = nblkptr;
	if (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR && !keep_spill) {
	dbuf_rm_spill(dn, tx);
	dnode_rm_spill(dn, tx);
	}

	rw_exit(&dn->dn_struct_rwlock);

	/* change type */
	dn->dn_type = ot;

	/* change bonus size and type */
	mutex_enter(&dn->dn_mtx);
	dn->dn_bonustype = bonustype;
	dn->dn_bonuslen = bonuslen;
	dn->dn_num_slots = dn_slots;
	dn->dn_nblkptr = nblkptr;
	dn->dn_checksum = ZIO_CHECKSUM_INHERIT;
	dn->dn_compress = ZIO_COMPRESS_INHERIT;
	ASSERT3U(dn->dn_nblkptr, <=, DN_MAX_NBLKPTR);

	/* fix up the bonus db_size */
	if (dn->dn_bonus) {
	dn->dn_bonus->db.db_size =
	DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots) -
	(dn->dn_nblkptr-1) * sizeof (blkptr_t);
	ASSERT(dn->dn_bonuslen <= dn->dn_bonus->db.db_size);
	}

	dn->dn_allocated_txg = tx->tx_txg;
	mutex_exit(&dn->dn_mtx);
	}

	#ifdef _KERNEL
	static void
	dnode_move_impl(dnode_t odn, dnode_t ndn)
	{
	int i;

	ASSERT(!RW_LOCK_HELD(&odn->dn_struct_rwlock));
	ASSERT(MUTEX_NOT_HELD(&odn->dn_mtx));
	ASSERT(MUTEX_NOT_HELD(&odn->dn_dbufs_mtx));

	/* Copy fields. */
	ndn->dn_objset = odn->dn_objset;
	ndn->dn_object = odn->dn_object;
	ndn->dn_dbuf = odn->dn_dbuf;
	ndn->dn_handle = odn->dn_handle;
	ndn->dn_phys = odn->dn_phys;
	ndn->dn_type = odn->dn_type;
	ndn->dn_bonuslen = odn->dn_bonuslen;
	ndn->dn_bonustype = odn->dn_bonustype;
	ndn->dn_nblkptr = odn->dn_nblkptr;
	ndn->dn_checksum = odn->dn_checksum;
	ndn->dn_compress = odn->dn_compress;
	ndn->dn_nlevels = odn->dn_nlevels;
	ndn->dn_indblkshift = odn->dn_indblkshift;
	ndn->dn_datablkshift = odn->dn_datablkshift;
	ndn->dn_datablkszsec = odn->dn_datablkszsec;
	ndn->dn_datablksz = odn->dn_datablksz;
	ndn->dn_maxblkid = odn->dn_maxblkid;
	ndn->dn_num_slots = odn->dn_num_slots;
	bcopy(&odn->dn_next_type[0], &ndn->dn_next_type[0],
	sizeof (odn->dn_next_type));
	bcopy(&odn->dn_next_nblkptr[0], &ndn->dn_next_nblkptr[0],
	sizeof (odn->dn_next_nblkptr));
	bcopy(&odn->dn_next_nlevels[0], &ndn->dn_next_nlevels[0],
	sizeof (odn->dn_next_nlevels));
	bcopy(&odn->dn_next_indblkshift[0], &ndn->dn_next_indblkshift[0],
	sizeof (odn->dn_next_indblkshift));
	bcopy(&odn->dn_next_bonustype[0], &ndn->dn_next_bonustype[0],
	sizeof (odn->dn_next_bonustype));
	bcopy(&odn->dn_rm_spillblk[0], &ndn->dn_rm_spillblk[0],
	sizeof (odn->dn_rm_spillblk));
	bcopy(&odn->dn_next_bonuslen[0], &ndn->dn_next_bonuslen[0],
	sizeof (odn->dn_next_bonuslen));
	bcopy(&odn->dn_next_blksz[0], &ndn->dn_next_blksz[0],
	sizeof (odn->dn_next_blksz));
	bcopy(&odn->dn_next_maxblkid[0], &ndn->dn_next_maxblkid[0],
	sizeof (odn->dn_next_maxblkid));
	for (i = 0; i < TXG_SIZE; i++) {
	list_move_tail(&ndn->dn_dirty_records[i],
	&odn->dn_dirty_records[i]);
	}
	bcopy(&odn->dn_free_ranges[0], &ndn->dn_free_ranges[0],
	sizeof (odn->dn_free_ranges));
	ndn->dn_allocated_txg = odn->dn_allocated_txg;
	ndn->dn_free_txg = odn->dn_free_txg;
	ndn->dn_assigned_txg = odn->dn_assigned_txg;
	ndn->dn_dirty_txg = odn->dn_dirty_txg;
	ndn->dn_dirtyctx = odn->dn_dirtyctx;
	ndn->dn_dirtyctx_firstset = odn->dn_dirtyctx_firstset;
	ASSERT(zfs_refcount_count(&odn->dn_tx_holds) == 0);
	zfs_refcount_transfer(&ndn->dn_holds, &odn->dn_holds);
	ASSERT(avl_is_empty(&ndn->dn_dbufs));
	avl_swap(&ndn->dn_dbufs, &odn->dn_dbufs);
	ndn->dn_dbufs_count = odn->dn_dbufs_count;
	ndn->dn_bonus = odn->dn_bonus;
	ndn->dn_have_spill = odn->dn_have_spill;
	ndn->dn_zio = odn->dn_zio;
	ndn->dn_oldused = odn->dn_oldused;
	ndn->dn_oldflags = odn->dn_oldflags;
	ndn->dn_olduid = odn->dn_olduid;
	ndn->dn_oldgid = odn->dn_oldgid;
	ndn->dn_oldprojid = odn->dn_oldprojid;
	ndn->dn_newuid = odn->dn_newuid;
	ndn->dn_newgid = odn->dn_newgid;
	ndn->dn_newprojid = odn->dn_newprojid;
	ndn->dn_id_flags = odn->dn_id_flags;
	dmu_zfetch_init(&ndn->dn_zfetch, ndn);

	/*
	* Update back pointers. Updating the handle fixes the back pointer of
	* every descendant dbuf as well as the bonus dbuf.
	*/
	ASSERT(ndn->dn_handle->dnh_dnode == odn);
	ndn->dn_handle->dnh_dnode = ndn;

	/*
	* Invalidate the original dnode by clearing all of its back pointers.
	*/
	odn->dn_dbuf = NULL;
	odn->dn_handle = NULL;
	avl_create(&odn->dn_dbufs, dbuf_compare, sizeof (dmu_buf_impl_t),
	offsetof(dmu_buf_impl_t, db_link));
	odn->dn_dbufs_count = 0;
	odn->dn_bonus = NULL;
	dmu_zfetch_fini(&odn->dn_zfetch);

	/*
	* Set the low bit of the objset pointer to ensure that dnode_move()
	* recognizes the dnode as invalid in any subsequent callback.
	*/
	POINTER_INVALIDATE(&odn->dn_objset);

	/*
	* Satisfy the destructor.
	*/
	for (i = 0; i < TXG_SIZE; i++) {
	list_create(&odn->dn_dirty_records[i],
	sizeof (dbuf_dirty_record_t),
	offsetof(dbuf_dirty_record_t, dr_dirty_node));
	odn->dn_free_ranges[i] = NULL;
	odn->dn_next_nlevels[i] = 0;
	odn->dn_next_indblkshift[i] = 0;
	odn->dn_next_bonustype[i] = 0;
	odn->dn_rm_spillblk[i] = 0;
	odn->dn_next_bonuslen[i] = 0;
	odn->dn_next_blksz[i] = 0;
	}
	odn->dn_allocated_txg = 0;
	odn->dn_free_txg = 0;
	odn->dn_assigned_txg = 0;
	odn->dn_dirty_txg = 0;
	odn->dn_dirtyctx = 0;
	odn->dn_dirtyctx_firstset = NULL;
	odn->dn_have_spill = B_FALSE;
	odn->dn_zio = NULL;
	odn->dn_oldused = 0;
	odn->dn_oldflags = 0;
	odn->dn_olduid = 0;
	odn->dn_oldgid = 0;
	odn->dn_oldprojid = ZFS_DEFAULT_PROJID;
	odn->dn_newuid = 0;
	odn->dn_newgid = 0;
	odn->dn_newprojid = ZFS_DEFAULT_PROJID;
	odn->dn_id_flags = 0;

	/*
	* Mark the dnode.
	*/
	ndn->dn_moved = 1;
	odn->dn_moved = (uint8_t)-1;
	}

	/ARGSUSED/
	static kmem_cbrc_t
	dnode_move(void buf, void newbuf, size_t size, void *arg)
	{
	dnode_t odn = buf, ndn = newbuf;
	objset_t *os;
	int64_t refcount;
	uint32_t dbufs;

	/*
	* The dnode is on the objset's list of known dnodes if the objset
	* pointer is valid. We set the low bit of the objset pointer when
	* freeing the dnode to invalidate it, and the memory patterns written
	* by kmem (baddcafe and deadbeef) set at least one of the two low bits.
	* A newly created dnode sets the objset pointer last of all to indicate
	* that the dnode is known and in a valid state to be moved by this
	* function.
	*/
	os = odn->dn_objset;
	if (!POINTER_IS_VALID(os)) {
	DNODE_STAT_BUMP(dnode_move_invalid);
	return (KMEM_CBRC_DONT_KNOW);
	}

	/*
	* Ensure that the objset does not go away during the move.
	*/
	rw_enter(&os_lock, RW_WRITER);
	if (os != odn->dn_objset) {
	rw_exit(&os_lock);
	DNODE_STAT_BUMP(dnode_move_recheck1);
	return (KMEM_CBRC_DONT_KNOW);
	}

	/*
	* If the dnode is still valid, then so is the objset. We know that no
	* valid objset can be freed while we hold os_lock, so we can safely
	* ensure that the objset remains in use.
	*/
	mutex_enter(&os->os_lock);

	/*
	* Recheck the objset pointer in case the dnode was removed just before
	* acquiring the lock.
	*/
	if (os != odn->dn_objset) {
	mutex_exit(&os->os_lock);
	rw_exit(&os_lock);
	DNODE_STAT_BUMP(dnode_move_recheck2);
	return (KMEM_CBRC_DONT_KNOW);
	}

	/*
	* At this point we know that as long as we hold os->os_lock, the dnode
	* cannot be freed and fields within the dnode can be safely accessed.
	* The objset listing this dnode cannot go away as long as this dnode is
	* on its list.
	*/
	rw_exit(&os_lock);
	if (DMU_OBJECT_IS_SPECIAL(odn->dn_object)) {
	mutex_exit(&os->os_lock);
	DNODE_STAT_BUMP(dnode_move_special);
	return (KMEM_CBRC_NO);
	}
	ASSERT(odn->dn_dbuf != NULL); /* only "special" dnodes have no parent */

	/*
	* Lock the dnode handle to prevent the dnode from obtaining any new
	* holds. This also prevents the descendant dbufs and the bonus dbuf
	* from accessing the dnode, so that we can discount their holds. The
	* handle is safe to access because we know that while the dnode cannot
	* go away, neither can its handle. Once we hold dnh_zrlock, we can
	* safely move any dnode referenced only by dbufs.
	*/
	if (!zrl_tryenter(&odn->dn_handle->dnh_zrlock)) {
	mutex_exit(&os->os_lock);
	DNODE_STAT_BUMP(dnode_move_handle);
	return (KMEM_CBRC_LATER);
	}

	/*
	* Ensure a consistent view of the dnode's holds and the dnode's dbufs.
	* We need to guarantee that there is a hold for every dbuf in order to
	* determine whether the dnode is actively referenced. Falsely matching
	* a dbuf to an active hold would lead to an unsafe move. It's possible
	* that a thread already having an active dnode hold is about to add a
	* dbuf, and we can't compare hold and dbuf counts while the add is in
	* progress.
	*/
	if (!rw_tryenter(&odn->dn_struct_rwlock, RW_WRITER)) {
	zrl_exit(&odn->dn_handle->dnh_zrlock);
	mutex_exit(&os->os_lock);
	DNODE_STAT_BUMP(dnode_move_rwlock);
	return (KMEM_CBRC_LATER);
	}

	/*
	* A dbuf may be removed (evicted) without an active dnode hold. In that
	* case, the dbuf count is decremented under the handle lock before the
	* dbuf's hold is released. This order ensures that if we count the hold
	* after the dbuf is removed but before its hold is released, we will
	* treat the unmatched hold as active and exit safely. If we count the
	* hold before the dbuf is removed, the hold is discounted, and the
	* removal is blocked until the move completes.
	*/
	refcount = zfs_refcount_count(&odn->dn_holds);
	ASSERT(refcount >= 0);
	dbufs = DN_DBUFS_COUNT(odn);

	/* We can't have more dbufs than dnode holds. */
	ASSERT3U(dbufs, <=, refcount);
	DTRACE_PROBE3(dnode__move, dnode_t *, odn, int64_t, refcount,
	uint32_t, dbufs);

	if (refcount > dbufs) {
	rw_exit(&odn->dn_struct_rwlock);
	zrl_exit(&odn->dn_handle->dnh_zrlock);
	mutex_exit(&os->os_lock);
	DNODE_STAT_BUMP(dnode_move_active);
	return (KMEM_CBRC_LATER);
	}

	rw_exit(&odn->dn_struct_rwlock);

	/*
	* At this point we know that anyone with a hold on the dnode is not
	* actively referencing it. The dnode is known and in a valid state to
	* move. We're holding the locks needed to execute the critical section.
	*/
	dnode_move_impl(odn, ndn);

	list_link_replace(&odn->dn_link, &ndn->dn_link);
	/* If the dnode was safe to move, the refcount cannot have changed. */
	ASSERT(refcount == zfs_refcount_count(&ndn->dn_holds));
	ASSERT(dbufs == DN_DBUFS_COUNT(ndn));
	zrl_exit(&ndn->dn_handle->dnh_zrlock); /* handle has moved */
	mutex_exit(&os->os_lock);

	return (KMEM_CBRC_YES);
	}
	#endif /* _KERNEL */

	static void
	dnode_slots_hold(dnode_children_t *children, int idx, int slots)
	{
	ASSERT3S(idx + slots, <=, DNODES_PER_BLOCK);

	for (int i = idx; i < idx + slots; i++) {
	dnode_handle_t *dnh = &children->dnc_children[i];
	zrl_add(&dnh->dnh_zrlock);
	}
	}

	static void
	dnode_slots_rele(dnode_children_t *children, int idx, int slots)
	{
	ASSERT3S(idx + slots, <=, DNODES_PER_BLOCK);

	for (int i = idx; i < idx + slots; i++) {
	dnode_handle_t *dnh = &children->dnc_children[i];

	if (zrl_is_locked(&dnh->dnh_zrlock))
	zrl_exit(&dnh->dnh_zrlock);
	else
	zrl_remove(&dnh->dnh_zrlock);
	}
	}

	static int
	dnode_slots_tryenter(dnode_children_t *children, int idx, int slots)
	{
	ASSERT3S(idx + slots, <=, DNODES_PER_BLOCK);

	for (int i = idx; i < idx + slots; i++) {
	dnode_handle_t *dnh = &children->dnc_children[i];

	if (!zrl_tryenter(&dnh->dnh_zrlock)) {
	for (int j = idx; j < i; j++) {
	dnh = &children->dnc_children[j];
	zrl_exit(&dnh->dnh_zrlock);
	}

	return (0);
	}
	}

	return (1);
	}

	static void
	dnode_set_slots(dnode_children_t children, int idx, int slots, void ptr)
	{
	ASSERT3S(idx + slots, <=, DNODES_PER_BLOCK);

	for (int i = idx; i < idx + slots; i++) {
	dnode_handle_t *dnh = &children->dnc_children[i];
	dnh->dnh_dnode = ptr;
	}
	}

	static boolean_t
	dnode_check_slots_free(dnode_children_t *children, int idx, int slots)
	{
	ASSERT3S(idx + slots, <=, DNODES_PER_BLOCK);

	/*
	* If all dnode slots are either already free or
	* evictable return B_TRUE.
	*/
	for (int i = idx; i < idx + slots; i++) {
	dnode_handle_t *dnh = &children->dnc_children[i];
	dnode_t *dn = dnh->dnh_dnode;

	if (dn == DN_SLOT_FREE) {
	continue;
	} else if (DN_SLOT_IS_PTR(dn)) {
	mutex_enter(&dn->dn_mtx);
	boolean_t can_free = (dn->dn_type == DMU_OT_NONE &&
	zfs_refcount_is_zero(&dn->dn_holds) &&
	!DNODE_IS_DIRTY(dn));
	mutex_exit(&dn->dn_mtx);

	if (!can_free)
	return (B_FALSE);
	else
	continue;
	} else {
	return (B_FALSE);
	}
	}

	return (B_TRUE);
	}

	static void
	dnode_reclaim_slots(dnode_children_t *children, int idx, int slots)
	{
	ASSERT3S(idx + slots, <=, DNODES_PER_BLOCK);

	for (int i = idx; i < idx + slots; i++) {
	dnode_handle_t *dnh = &children->dnc_children[i];

	ASSERT(zrl_is_locked(&dnh->dnh_zrlock));

	if (DN_SLOT_IS_PTR(dnh->dnh_dnode)) {
	ASSERT3S(dnh->dnh_dnode->dn_type, ==, DMU_OT_NONE);
	dnode_destroy(dnh->dnh_dnode);
	dnh->dnh_dnode = DN_SLOT_FREE;
	}
	}
	}

	void
	dnode_free_interior_slots(dnode_t *dn)
	{
	dnode_children_t *children = dmu_buf_get_user(&dn->dn_dbuf->db);
	int epb = dn->dn_dbuf->db.db_size >> DNODE_SHIFT;
	int idx = (dn->dn_object & (epb - 1)) + 1;
	int slots = dn->dn_num_slots - 1;

	if (slots == 0)
	return;

	ASSERT3S(idx + slots, <=, DNODES_PER_BLOCK);

	while (!dnode_slots_tryenter(children, idx, slots)) {
	DNODE_STAT_BUMP(dnode_free_interior_lock_retry);
	cond_resched();
	}

	dnode_set_slots(children, idx, slots, DN_SLOT_FREE);
	dnode_slots_rele(children, idx, slots);
	}

	void
	dnode_special_close(dnode_handle_t *dnh)
	{
	dnode_t *dn = dnh->dnh_dnode;

	/*
	* Ensure dnode_rele_and_unlock() has released dn_mtx, after final
	* zfs_refcount_remove()
	*/
	mutex_enter(&dn->dn_mtx);
	if (zfs_refcount_count(&dn->dn_holds) > 0)
	cv_wait(&dn->dn_nodnholds, &dn->dn_mtx);
	mutex_exit(&dn->dn_mtx);
	ASSERT3U(zfs_refcount_count(&dn->dn_holds), ==, 0);

	ASSERT(dn->dn_dbuf == NULL \|\|
	dmu_buf_get_user(&dn->dn_dbuf->db) == NULL);
	zrl_add(&dnh->dnh_zrlock);
	dnode_destroy(dn); /* implicit zrl_remove() */
	zrl_destroy(&dnh->dnh_zrlock);
	dnh->dnh_dnode = NULL;
	}

	void
	dnode_special_open(objset_t os, dnode_phys_t dnp, uint64_t object,
	dnode_handle_t *dnh)
	{
	dnode_t *dn;

	zrl_init(&dnh->dnh_zrlock);
	VERIFY3U(1, ==, zrl_tryenter(&dnh->dnh_zrlock));

	dn = dnode_create(os, dnp, NULL, object, dnh);
	DNODE_VERIFY(dn);

	zrl_exit(&dnh->dnh_zrlock);
	}

	static void
	dnode_buf_evict_async(void *dbu)
	{
	dnode_children_t *dnc = dbu;

	DNODE_STAT_BUMP(dnode_buf_evict);

	for (int i = 0; i < dnc->dnc_count; i++) {
	dnode_handle_t *dnh = &dnc->dnc_children[i];
	dnode_t *dn;

	/*
	* The dnode handle lock guards against the dnode moving to
	* another valid address, so there is no need here to guard
	* against changes to or from NULL.
	*/
	if (!DN_SLOT_IS_PTR(dnh->dnh_dnode)) {
	zrl_destroy(&dnh->dnh_zrlock);
	dnh->dnh_dnode = DN_SLOT_UNINIT;
	continue;
	}

	zrl_add(&dnh->dnh_zrlock);
	dn = dnh->dnh_dnode;
	/*
	* If there are holds on this dnode, then there should
	* be holds on the dnode's containing dbuf as well; thus
	* it wouldn't be eligible for eviction and this function
	* would not have been called.
	*/
	ASSERT(zfs_refcount_is_zero(&dn->dn_holds));
	ASSERT(zfs_refcount_is_zero(&dn->dn_tx_holds));

	dnode_destroy(dn); /* implicit zrl_remove() for first slot */
	zrl_destroy(&dnh->dnh_zrlock);
	dnh->dnh_dnode = DN_SLOT_UNINIT;
	}
	kmem_free(dnc, sizeof (dnode_children_t) +
	dnc->dnc_count * sizeof (dnode_handle_t));
	}

	/*
	* When the DNODE_MUST_BE_FREE flag is set, the "slots" parameter is used
	* to ensure the hole at the specified object offset is large enough to
	* hold the dnode being created. The slots parameter is also used to ensure
	* a dnode does not span multiple dnode blocks. In both of these cases, if
	* a failure occurs, ENOSPC is returned. Keep in mind, these failure cases
	* are only possible when using DNODE_MUST_BE_FREE.
	*
	* If the DNODE_MUST_BE_ALLOCATED flag is set, "slots" must be 0.
	* dnode_hold_impl() will check if the requested dnode is already consumed
	* as an extra dnode slot by an large dnode, in which case it returns
	* ENOENT.
	*
	* If the DNODE_DRY_RUN flag is set, we don't actually hold the dnode, just
	* return whether the hold would succeed or not. tag and dnp should set to
	* NULL in this case.
	*
	* errors:
	* EINVAL - Invalid object number or flags.
	* ENOSPC - Hole too small to fulfill "slots" request (DNODE_MUST_BE_FREE)
	* EEXIST - Refers to an allocated dnode (DNODE_MUST_BE_FREE)
	* - Refers to a freeing dnode (DNODE_MUST_BE_FREE)
	* - Refers to an interior dnode slot (DNODE_MUST_BE_ALLOCATED)
	* ENOENT - The requested dnode is not allocated (DNODE_MUST_BE_ALLOCATED)
	* - The requested dnode is being freed (DNODE_MUST_BE_ALLOCATED)
	* EIO - I/O error when reading the meta dnode dbuf.
	*
	* succeeds even for free dnodes.
	*/
	int
	dnode_hold_impl(objset_t *os, uint64_t object, int flag, int slots,
	void tag, dnode_t *dnp)
	{
	int epb, idx, err;
	int drop_struct_lock = FALSE;
	int type;
	uint64_t blk;
	dnode_t mdn, dn;
	dmu_buf_impl_t *db;
	dnode_children_t *dnc;
	dnode_phys_t *dn_block;
	dnode_handle_t *dnh;

	ASSERT(!(flag & DNODE_MUST_BE_ALLOCATED) \|\| (slots == 0));
	ASSERT(!(flag & DNODE_MUST_BE_FREE) \|\| (slots > 0));
	IMPLY(flag & DNODE_DRY_RUN, (tag == NULL) && (dnp == NULL));

	/*
	* If you are holding the spa config lock as writer, you shouldn't
	* be asking the DMU to do anything unless it's the root pool
	* which may require us to read from the root filesystem while
	* holding some (not all) of the locks as writer.
	*/
	ASSERT(spa_config_held(os->os_spa, SCL_ALL, RW_WRITER) == 0 \|\|
	(spa_is_root(os->os_spa) &&
	spa_config_held(os->os_spa, SCL_STATE, RW_WRITER)));

	ASSERT((flag & DNODE_MUST_BE_ALLOCATED) \|\| (flag & DNODE_MUST_BE_FREE));

	if (object == DMU_USERUSED_OBJECT \|\| object == DMU_GROUPUSED_OBJECT \|\|
	object == DMU_PROJECTUSED_OBJECT) {
	if (object == DMU_USERUSED_OBJECT)
	dn = DMU_USERUSED_DNODE(os);
	else if (object == DMU_GROUPUSED_OBJECT)
	dn = DMU_GROUPUSED_DNODE(os);
	else
	dn = DMU_PROJECTUSED_DNODE(os);
	if (dn == NULL)
	return (SET_ERROR(ENOENT));
	type = dn->dn_type;
	if ((flag & DNODE_MUST_BE_ALLOCATED) && type == DMU_OT_NONE)
	return (SET_ERROR(ENOENT));
	if ((flag & DNODE_MUST_BE_FREE) && type != DMU_OT_NONE)
	return (SET_ERROR(EEXIST));
	DNODE_VERIFY(dn);
	/* Don't actually hold if dry run, just return 0 */
	if (!(flag & DNODE_DRY_RUN)) {
	(void) zfs_refcount_add(&dn->dn_holds, tag);
	*dnp = dn;
	}
	return (0);
	}

	if (object == 0 \|\| object >= DN_MAX_OBJECT)
	return (SET_ERROR(EINVAL));

	mdn = DMU_META_DNODE(os);
	ASSERT(mdn->dn_object == DMU_META_DNODE_OBJECT);

	DNODE_VERIFY(mdn);

	if (!RW_WRITE_HELD(&mdn->dn_struct_rwlock)) {
	rw_enter(&mdn->dn_struct_rwlock, RW_READER);
	drop_struct_lock = TRUE;
	}

	blk = dbuf_whichblock(mdn, 0, object * sizeof (dnode_phys_t));
	db = dbuf_hold(mdn, blk, FTAG);
	if (drop_struct_lock)
	rw_exit(&mdn->dn_struct_rwlock);
	if (db == NULL) {
	DNODE_STAT_BUMP(dnode_hold_dbuf_hold);
	return (SET_ERROR(EIO));
	}

	/*
	* We do not need to decrypt to read the dnode so it doesn't matter
	* if we get the encrypted or decrypted version.
	*/
	err = dbuf_read(db, NULL, DB_RF_CANFAIL \|
	DB_RF_NO_DECRYPT \| DB_RF_NOPREFETCH);
	if (err) {
	DNODE_STAT_BUMP(dnode_hold_dbuf_read);
	dbuf_rele(db, FTAG);
	return (err);
	}

	ASSERT3U(db->db.db_size, >=, 1<<DNODE_SHIFT);
	epb = db->db.db_size >> DNODE_SHIFT;

	idx = object & (epb - 1);
	dn_block = (dnode_phys_t *)db->db.db_data;

	ASSERT(DB_DNODE(db)->dn_type == DMU_OT_DNODE);
	dnc = dmu_buf_get_user(&db->db);
	dnh = NULL;
	if (dnc == NULL) {
	dnode_children_t *winner;
	int skip = 0;

	dnc = kmem_zalloc(sizeof (dnode_children_t) +
	epb * sizeof (dnode_handle_t), KM_SLEEP);
	dnc->dnc_count = epb;
	dnh = &dnc->dnc_children[0];

	/* Initialize dnode slot status from dnode_phys_t */
	for (int i = 0; i < epb; i++) {
	zrl_init(&dnh[i].dnh_zrlock);

	if (skip) {
	skip--;
	continue;
	}

	if (dn_block[i].dn_type != DMU_OT_NONE) {
	int interior = dn_block[i].dn_extra_slots;

	dnode_set_slots(dnc, i, 1, DN_SLOT_ALLOCATED);
	dnode_set_slots(dnc, i + 1, interior,
	DN_SLOT_INTERIOR);
	skip = interior;
	} else {
	dnh[i].dnh_dnode = DN_SLOT_FREE;
	skip = 0;
	}
	}

	dmu_buf_init_user(&dnc->dnc_dbu, NULL,
	dnode_buf_evict_async, NULL);
	winner = dmu_buf_set_user(&db->db, &dnc->dnc_dbu);
	if (winner != NULL) {

	for (int i = 0; i < epb; i++)
	zrl_destroy(&dnh[i].dnh_zrlock);

	kmem_free(dnc, sizeof (dnode_children_t) +
	epb * sizeof (dnode_handle_t));
	dnc = winner;
	}
	}

	ASSERT(dnc->dnc_count == epb);

	if (flag & DNODE_MUST_BE_ALLOCATED) {
	slots = 1;

	dnode_slots_hold(dnc, idx, slots);
	dnh = &dnc->dnc_children[idx];

	if (DN_SLOT_IS_PTR(dnh->dnh_dnode)) {
	dn = dnh->dnh_dnode;
	} else if (dnh->dnh_dnode == DN_SLOT_INTERIOR) {
	DNODE_STAT_BUMP(dnode_hold_alloc_interior);
	dnode_slots_rele(dnc, idx, slots);
	dbuf_rele(db, FTAG);
	return (SET_ERROR(EEXIST));
	} else if (dnh->dnh_dnode != DN_SLOT_ALLOCATED) {
	DNODE_STAT_BUMP(dnode_hold_alloc_misses);
	dnode_slots_rele(dnc, idx, slots);
	dbuf_rele(db, FTAG);
	return (SET_ERROR(ENOENT));
	} else {
	dnode_slots_rele(dnc, idx, slots);
	while (!dnode_slots_tryenter(dnc, idx, slots)) {
	DNODE_STAT_BUMP(dnode_hold_alloc_lock_retry);
	cond_resched();
	}

	/*
	* Someone else won the race and called dnode_create()
	* after we checked DN_SLOT_IS_PTR() above but before
	* we acquired the lock.
	*/
	if (DN_SLOT_IS_PTR(dnh->dnh_dnode)) {
	DNODE_STAT_BUMP(dnode_hold_alloc_lock_misses);
	dn = dnh->dnh_dnode;
	} else {
	dn = dnode_create(os, dn_block + idx, db,
	object, dnh);
	}
	}

	mutex_enter(&dn->dn_mtx);
	if (dn->dn_type == DMU_OT_NONE \|\| dn->dn_free_txg != 0) {
	DNODE_STAT_BUMP(dnode_hold_alloc_type_none);
	mutex_exit(&dn->dn_mtx);
	dnode_slots_rele(dnc, idx, slots);
	dbuf_rele(db, FTAG);
	return (SET_ERROR(ENOENT));
	}

	/* Don't actually hold if dry run, just return 0 */
	if (flag & DNODE_DRY_RUN) {
	mutex_exit(&dn->dn_mtx);
	dnode_slots_rele(dnc, idx, slots);
	dbuf_rele(db, FTAG);
	return (0);
	}

	DNODE_STAT_BUMP(dnode_hold_alloc_hits);
	} else if (flag & DNODE_MUST_BE_FREE) {

	if (idx + slots - 1 >= DNODES_PER_BLOCK) {
	DNODE_STAT_BUMP(dnode_hold_free_overflow);
	dbuf_rele(db, FTAG);
	return (SET_ERROR(ENOSPC));
	}

	dnode_slots_hold(dnc, idx, slots);

	if (!dnode_check_slots_free(dnc, idx, slots)) {
	DNODE_STAT_BUMP(dnode_hold_free_misses);
	dnode_slots_rele(dnc, idx, slots);
	dbuf_rele(db, FTAG);
	return (SET_ERROR(ENOSPC));
	}

	dnode_slots_rele(dnc, idx, slots);
	while (!dnode_slots_tryenter(dnc, idx, slots)) {
	DNODE_STAT_BUMP(dnode_hold_free_lock_retry);
	cond_resched();
	}

	if (!dnode_check_slots_free(dnc, idx, slots)) {
	DNODE_STAT_BUMP(dnode_hold_free_lock_misses);
	dnode_slots_rele(dnc, idx, slots);
	dbuf_rele(db, FTAG);
	return (SET_ERROR(ENOSPC));
	}

	/*
	* Allocated but otherwise free dnodes which would
	* be in the interior of a multi-slot dnodes need
	* to be freed. Single slot dnodes can be safely
	* re-purposed as a performance optimization.
	*/
	if (slots > 1)
	dnode_reclaim_slots(dnc, idx + 1, slots - 1);

	dnh = &dnc->dnc_children[idx];
	if (DN_SLOT_IS_PTR(dnh->dnh_dnode)) {
	dn = dnh->dnh_dnode;
	} else {
	dn = dnode_create(os, dn_block + idx, db,
	object, dnh);
	}

	mutex_enter(&dn->dn_mtx);
	if (!zfs_refcount_is_zero(&dn->dn_holds) \|\| dn->dn_free_txg) {
	DNODE_STAT_BUMP(dnode_hold_free_refcount);
	mutex_exit(&dn->dn_mtx);
	dnode_slots_rele(dnc, idx, slots);
	dbuf_rele(db, FTAG);
	return (SET_ERROR(EEXIST));
	}

	/* Don't actually hold if dry run, just return 0 */
	if (flag & DNODE_DRY_RUN) {
	mutex_exit(&dn->dn_mtx);
	dnode_slots_rele(dnc, idx, slots);
	dbuf_rele(db, FTAG);
	return (0);
	}

	dnode_set_slots(dnc, idx + 1, slots - 1, DN_SLOT_INTERIOR);
	DNODE_STAT_BUMP(dnode_hold_free_hits);
	} else {
	dbuf_rele(db, FTAG);
	return (SET_ERROR(EINVAL));
	}

	ASSERT0(dn->dn_free_txg);

	if (zfs_refcount_add(&dn->dn_holds, tag) == 1)
	dbuf_add_ref(db, dnh);

	mutex_exit(&dn->dn_mtx);

	/* Now we can rely on the hold to prevent the dnode from moving. */
	dnode_slots_rele(dnc, idx, slots);

	DNODE_VERIFY(dn);
	ASSERT3P(dnp, !=, NULL);
	ASSERT3P(dn->dn_dbuf, ==, db);
	ASSERT3U(dn->dn_object, ==, object);
	dbuf_rele(db, FTAG);

	*dnp = dn;
	return (0);
	}

	/*
	* Return held dnode if the object is allocated, NULL if not.
	*/
	int
	dnode_hold(objset_t os, uint64_t object, void tag, dnode_t **dnp)
	{
	return (dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, 0, tag,
	dnp));
	}

	/*
	* Can only add a reference if there is already at least one
	* reference on the dnode. Returns FALSE if unable to add a
	* new reference.
	*/
	boolean_t
	dnode_add_ref(dnode_t dn, void tag)
	{
	mutex_enter(&dn->dn_mtx);
	if (zfs_refcount_is_zero(&dn->dn_holds)) {
	mutex_exit(&dn->dn_mtx);
	return (FALSE);
	}
	VERIFY(1 < zfs_refcount_add(&dn->dn_holds, tag));
	mutex_exit(&dn->dn_mtx);
	return (TRUE);
	}

	void
	dnode_rele(dnode_t dn, void tag)
	{
	mutex_enter(&dn->dn_mtx);
	dnode_rele_and_unlock(dn, tag, B_FALSE);
	}

	void
	dnode_rele_and_unlock(dnode_t dn, void tag, boolean_t evicting)
	{
	uint64_t refs;
	/* Get while the hold prevents the dnode from moving. */
	dmu_buf_impl_t *db = dn->dn_dbuf;
	dnode_handle_t *dnh = dn->dn_handle;

	refs = zfs_refcount_remove(&dn->dn_holds, tag);
	if (refs == 0)
	cv_broadcast(&dn->dn_nodnholds);
	mutex_exit(&dn->dn_mtx);
	/* dnode could get destroyed at this point, so don't use it anymore */

	/*
	* It's unsafe to release the last hold on a dnode by dnode_rele() or
	* indirectly by dbuf_rele() while relying on the dnode handle to
	* prevent the dnode from moving, since releasing the last hold could
	* result in the dnode's parent dbuf evicting its dnode handles. For
	* that reason anyone calling dnode_rele() or dbuf_rele() without some
	* other direct or indirect hold on the dnode must first drop the dnode
	* handle.
	*/
	ASSERT(refs > 0 \|\| dnh->dnh_zrlock.zr_owner != curthread);

	/* NOTE: the DNODE_DNODE does not have a dn_dbuf */
	if (refs == 0 && db != NULL) {
	/*
	* Another thread could add a hold to the dnode handle in
	* dnode_hold_impl() while holding the parent dbuf. Since the
	* hold on the parent dbuf prevents the handle from being
	* destroyed, the hold on the handle is OK. We can't yet assert
	* that the handle has zero references, but that will be
	* asserted anyway when the handle gets destroyed.
	*/
	mutex_enter(&db->db_mtx);
	dbuf_rele_and_unlock(db, dnh, evicting);
	}
	}

	/*
	* Test whether we can create a dnode at the specified location.
	*/
	int
	dnode_try_claim(objset_t *os, uint64_t object, int slots)
	{
	return (dnode_hold_impl(os, object, DNODE_MUST_BE_FREE \| DNODE_DRY_RUN,
	slots, NULL, NULL));
	}

	void
	dnode_setdirty(dnode_t dn, dmu_tx_t tx)
	{
	objset_t *os = dn->dn_objset;
	uint64_t txg = tx->tx_txg;

	if (DMU_OBJECT_IS_SPECIAL(dn->dn_object)) {
	dsl_dataset_dirty(os->os_dsl_dataset, tx);
	return;
	}

	DNODE_VERIFY(dn);

	#ifdef ZFS_DEBUG
	mutex_enter(&dn->dn_mtx);
	ASSERT(dn->dn_phys->dn_type \|\| dn->dn_allocated_txg);
	ASSERT(dn->dn_free_txg == 0 \|\| dn->dn_free_txg >= txg);
	mutex_exit(&dn->dn_mtx);
	#endif

	/*
	* Determine old uid/gid when necessary
	*/
	dmu_objset_userquota_get_ids(dn, B_TRUE, tx);

	multilist_t *dirtylist = &os->os_dirty_dnodes[txg & TXG_MASK];
	multilist_sublist_t *mls = multilist_sublist_lock_obj(dirtylist, dn);

	/*
	* If we are already marked dirty, we're done.
	*/
	if (multilist_link_active(&dn->dn_dirty_link[txg & TXG_MASK])) {
	multilist_sublist_unlock(mls);
	return;
	}

	ASSERT(!zfs_refcount_is_zero(&dn->dn_holds) \|\|
	!avl_is_empty(&dn->dn_dbufs));
	ASSERT(dn->dn_datablksz != 0);
	ASSERT0(dn->dn_next_bonuslen[txg & TXG_MASK]);
	ASSERT0(dn->dn_next_blksz[txg & TXG_MASK]);
	ASSERT0(dn->dn_next_bonustype[txg & TXG_MASK]);

	dprintf_ds(os->os_dsl_dataset, "obj=%llu txg=%llu\n",
	(u_longlong_t)dn->dn_object, (u_longlong_t)txg);

	multilist_sublist_insert_head(mls, dn);

	multilist_sublist_unlock(mls);

	/*
	* The dnode maintains a hold on its containing dbuf as
	* long as there are holds on it. Each instantiated child
	* dbuf maintains a hold on the dnode. When the last child
	* drops its hold, the dnode will drop its hold on the
	* containing dbuf. We add a "dirty hold" here so that the
	* dnode will hang around after we finish processing its
	* children.
	*/
	VERIFY(dnode_add_ref(dn, (void *)(uintptr_t)tx->tx_txg));

	(void) dbuf_dirty(dn->dn_dbuf, tx);

	dsl_dataset_dirty(os->os_dsl_dataset, tx);
	}

	void
	dnode_free(dnode_t dn, dmu_tx_t tx)
	{
	mutex_enter(&dn->dn_mtx);
	if (dn->dn_type == DMU_OT_NONE \|\| dn->dn_free_txg) {
	mutex_exit(&dn->dn_mtx);
	return;
	}
	dn->dn_free_txg = tx->tx_txg;
	mutex_exit(&dn->dn_mtx);

	dnode_setdirty(dn, tx);
	}

	/*
	* Try to change the block size for the indicated dnode. This can only
	* succeed if there are no blocks allocated or dirty beyond first block
	*/
	int
	dnode_set_blksz(dnode_t dn, uint64_t size, int ibs, dmu_tx_t tx)
	{
	dmu_buf_impl_t *db;
	int err;

	ASSERT3U(size, <=, spa_maxblocksize(dmu_objset_spa(dn->dn_objset)));
	if (size == 0)
	size = SPA_MINBLOCKSIZE;
	else
	size = P2ROUNDUP(size, SPA_MINBLOCKSIZE);

	if (ibs == dn->dn_indblkshift)
	ibs = 0;

	if (size >> SPA_MINBLOCKSHIFT == dn->dn_datablkszsec && ibs == 0)
	return (0);

	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);

	/* Check for any allocated blocks beyond the first */
	if (dn->dn_maxblkid != 0)
	goto fail;

	mutex_enter(&dn->dn_dbufs_mtx);
	for (db = avl_first(&dn->dn_dbufs); db != NULL;
	db = AVL_NEXT(&dn->dn_dbufs, db)) {
	if (db->db_blkid != 0 && db->db_blkid != DMU_BONUS_BLKID &&
	db->db_blkid != DMU_SPILL_BLKID) {
	mutex_exit(&dn->dn_dbufs_mtx);
	goto fail;
	}
	}
	mutex_exit(&dn->dn_dbufs_mtx);

	if (ibs && dn->dn_nlevels != 1)
	goto fail;

	/* resize the old block */
	err = dbuf_hold_impl(dn, 0, 0, TRUE, FALSE, FTAG, &db);
	if (err == 0) {
	dbuf_new_size(db, size, tx);
	} else if (err != ENOENT) {
	goto fail;
	}

	dnode_setdblksz(dn, size);
	dnode_setdirty(dn, tx);
	dn->dn_next_blksz[tx->tx_txg&TXG_MASK] = size;
	if (ibs) {
	dn->dn_indblkshift = ibs;
	dn->dn_next_indblkshift[tx->tx_txg&TXG_MASK] = ibs;
	}
	/* release after we have fixed the blocksize in the dnode */
	if (db)
	dbuf_rele(db, FTAG);

	rw_exit(&dn->dn_struct_rwlock);
	return (0);

	fail:
	rw_exit(&dn->dn_struct_rwlock);
	return (SET_ERROR(ENOTSUP));
	}

	static void
	dnode_set_nlevels_impl(dnode_t dn, int new_nlevels, dmu_tx_t tx)
	{
	uint64_t txgoff = tx->tx_txg & TXG_MASK;
	int old_nlevels = dn->dn_nlevels;
	dmu_buf_impl_t *db;
	list_t *list;
	dbuf_dirty_record_t new, dr, *dr_next;

	ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock));

	ASSERT3U(new_nlevels, >, dn->dn_nlevels);
	dn->dn_nlevels = new_nlevels;

	ASSERT3U(new_nlevels, >, dn->dn_next_nlevels[txgoff]);
	dn->dn_next_nlevels[txgoff] = new_nlevels;

	/* dirty the left indirects */
	db = dbuf_hold_level(dn, old_nlevels, 0, FTAG);
	ASSERT(db != NULL);
	new = dbuf_dirty(db, tx);
	dbuf_rele(db, FTAG);

	/* transfer the dirty records to the new indirect */
	mutex_enter(&dn->dn_mtx);
	mutex_enter(&new->dt.di.dr_mtx);
	list = &dn->dn_dirty_records[txgoff];
	for (dr = list_head(list); dr; dr = dr_next) {
	dr_next = list_next(&dn->dn_dirty_records[txgoff], dr);

	IMPLY(dr->dr_dbuf == NULL, old_nlevels == 1);
	if (dr->dr_dbuf == NULL \|\|
	(dr->dr_dbuf->db_level == old_nlevels - 1 &&
	dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID &&
	dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID)) {
	list_remove(&dn->dn_dirty_records[txgoff], dr);
	list_insert_tail(&new->dt.di.dr_children, dr);
	dr->dr_parent = new;
	}
	}
	mutex_exit(&new->dt.di.dr_mtx);
	mutex_exit(&dn->dn_mtx);
	}

	int
	dnode_set_nlevels(dnode_t dn, int nlevels, dmu_tx_t tx)
	{
	int ret = 0;

	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);

	if (dn->dn_nlevels == nlevels) {
	ret = 0;
	goto out;
	} else if (nlevels < dn->dn_nlevels) {
	ret = SET_ERROR(EINVAL);
	goto out;
	}

	dnode_set_nlevels_impl(dn, nlevels, tx);

	out:
	rw_exit(&dn->dn_struct_rwlock);
	return (ret);
	}

	/* read-holding callers must not rely on the lock being continuously held */
	void
	dnode_new_blkid(dnode_t dn, uint64_t blkid, dmu_tx_t tx, boolean_t have_read,
	boolean_t force)
	{
	int epbs, new_nlevels;
	uint64_t sz;

	ASSERT(blkid != DMU_BONUS_BLKID);

	ASSERT(have_read ?
	RW_READ_HELD(&dn->dn_struct_rwlock) :
	RW_WRITE_HELD(&dn->dn_struct_rwlock));

	/*
	* if we have a read-lock, check to see if we need to do any work
	* before upgrading to a write-lock.
	*/
	if (have_read) {
	if (blkid <= dn->dn_maxblkid)
	return;

	if (!rw_tryupgrade(&dn->dn_struct_rwlock)) {
	rw_exit(&dn->dn_struct_rwlock);
	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
	}
	}

	/*
	* Raw sends (indicated by the force flag) require that we take the
	* given blkid even if the value is lower than the current value.
	*/
	if (!force && blkid <= dn->dn_maxblkid)
	goto out;

	/*
	* We use the (otherwise unused) top bit of dn_next_maxblkid[txgoff]
	* to indicate that this field is set. This allows us to set the
	* maxblkid to 0 on an existing object in dnode_sync().
	*/
	dn->dn_maxblkid = blkid;
	dn->dn_next_maxblkid[tx->tx_txg & TXG_MASK] =
	blkid \| DMU_NEXT_MAXBLKID_SET;

	/*
	* Compute the number of levels necessary to support the new maxblkid.
	* Raw sends will ensure nlevels is set correctly for us.
	*/
	new_nlevels = 1;
	epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
	for (sz = dn->dn_nblkptr;
	sz <= blkid && sz >= dn->dn_nblkptr; sz <<= epbs)
	new_nlevels++;

	ASSERT3U(new_nlevels, <=, DN_MAX_LEVELS);

	if (!force) {
	if (new_nlevels > dn->dn_nlevels)
	dnode_set_nlevels_impl(dn, new_nlevels, tx);
	} else {
	ASSERT3U(dn->dn_nlevels, >=, new_nlevels);
	}

	out:
	if (have_read)
	rw_downgrade(&dn->dn_struct_rwlock);
	}

	static void
	dnode_dirty_l1(dnode_t dn, uint64_t l1blkid, dmu_tx_t tx)
	{
	dmu_buf_impl_t *db = dbuf_hold_level(dn, 1, l1blkid, FTAG);
	if (db != NULL) {
	dmu_buf_will_dirty(&db->db, tx);
	dbuf_rele(db, FTAG);
	}
	}

	/*
	* Dirty all the in-core level-1 dbufs in the range specified by start_blkid
	* and end_blkid.
	*/
	static void
	dnode_dirty_l1range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid,
	dmu_tx_t *tx)
	{
	dmu_buf_impl_t *db_search;
	dmu_buf_impl_t *db;
	avl_index_t where;

	db_search = kmem_zalloc(sizeof (dmu_buf_impl_t), KM_SLEEP);

	mutex_enter(&dn->dn_dbufs_mtx);

	db_search->db_level = 1;
	db_search->db_blkid = start_blkid + 1;
	db_search->db_state = DB_SEARCH;
	for (;;) {

	db = avl_find(&dn->dn_dbufs, db_search, &where);
	if (db == NULL)
	db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER);

	if (db == NULL \|\| db->db_level != 1 \|\|
	db->db_blkid >= end_blkid) {
	break;
	}

	/*
	* Setup the next blkid we want to search for.
	*/
	db_search->db_blkid = db->db_blkid + 1;
	ASSERT3U(db->db_blkid, >=, start_blkid);

	/*
	* If the dbuf transitions to DB_EVICTING while we're trying
	* to dirty it, then we will be unable to discover it in
	* the dbuf hash table. This will result in a call to
	* dbuf_create() which needs to acquire the dn_dbufs_mtx
	* lock. To avoid a deadlock, we drop the lock before
	* dirtying the level-1 dbuf.
	*/
	mutex_exit(&dn->dn_dbufs_mtx);
	dnode_dirty_l1(dn, db->db_blkid, tx);
	mutex_enter(&dn->dn_dbufs_mtx);
	}

	#ifdef ZFS_DEBUG
	/*
	* Walk all the in-core level-1 dbufs and verify they have been dirtied.
	*/
	db_search->db_level = 1;
	db_search->db_blkid = start_blkid + 1;
	db_search->db_state = DB_SEARCH;
	db = avl_find(&dn->dn_dbufs, db_search, &where);
	if (db == NULL)
	db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER);
	for (; db != NULL; db = AVL_NEXT(&dn->dn_dbufs, db)) {
	if (db->db_level != 1 \|\| db->db_blkid >= end_blkid)
	break;
	if (db->db_state != DB_EVICTING)
	ASSERT(db->db_dirtycnt > 0);
	}
	#endif
	kmem_free(db_search, sizeof (dmu_buf_impl_t));
	mutex_exit(&dn->dn_dbufs_mtx);
	}

	void
	dnode_set_dirtyctx(dnode_t dn, dmu_tx_t tx, void *tag)
	{
	/*
	* Don't set dirtyctx to SYNC if we're just modifying this as we
	* initialize the objset.
	*/
	if (dn->dn_dirtyctx == DN_UNDIRTIED) {
	dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset;

	if (ds != NULL) {
	rrw_enter(&ds->ds_bp_rwlock, RW_READER, tag);
	}
	if (!BP_IS_HOLE(dn->dn_objset->os_rootbp)) {
	if (dmu_tx_is_syncing(tx))
	dn->dn_dirtyctx = DN_DIRTY_SYNC;
	else
	dn->dn_dirtyctx = DN_DIRTY_OPEN;
	dn->dn_dirtyctx_firstset = tag;
	}
	if (ds != NULL) {
	rrw_exit(&ds->ds_bp_rwlock, tag);
	}
	}
	}

	void
	dnode_free_range(dnode_t dn, uint64_t off, uint64_t len, dmu_tx_t tx)
	{
	dmu_buf_impl_t *db;
	uint64_t blkoff, blkid, nblks;
	int blksz, blkshift, head, tail;
	int trunc = FALSE;
	int epbs;

	blksz = dn->dn_datablksz;
	blkshift = dn->dn_datablkshift;
	epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;

	if (len == DMU_OBJECT_END) {
	len = UINT64_MAX - off;
	trunc = TRUE;
	}

	/*
	* First, block align the region to free:
	*/
	if (ISP2(blksz)) {
	head = P2NPHASE(off, blksz);
	blkoff = P2PHASE(off, blksz);
	if ((off >> blkshift) > dn->dn_maxblkid)
	return;
	} else {
	ASSERT(dn->dn_maxblkid == 0);
	if (off == 0 && len >= blksz) {
	/*
	* Freeing the whole block; fast-track this request.
	*/
	blkid = 0;
	nblks = 1;
	if (dn->dn_nlevels > 1) {
	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
	dnode_dirty_l1(dn, 0, tx);
	rw_exit(&dn->dn_struct_rwlock);
	}
	goto done;
	} else if (off >= blksz) {
	/* Freeing past end-of-data */
	return;
	} else {
	/* Freeing part of the block. */
	head = blksz - off;
	ASSERT3U(head, >, 0);
	}
	blkoff = off;
	}
	/* zero out any partial block data at the start of the range */
	if (head) {
	int res;
	ASSERT3U(blkoff + head, ==, blksz);
	if (len < head)
	head = len;
	rw_enter(&dn->dn_struct_rwlock, RW_READER);
	res = dbuf_hold_impl(dn, 0, dbuf_whichblock(dn, 0, off),
	TRUE, FALSE, FTAG, &db);
	rw_exit(&dn->dn_struct_rwlock);
	if (res == 0) {
	caddr_t data;
	boolean_t dirty;

	db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_READER,
	FTAG);
	/* don't dirty if it isn't on disk and isn't dirty */
	dirty = !list_is_empty(&db->db_dirty_records) \|\|
	(db->db_blkptr && !BP_IS_HOLE(db->db_blkptr));
	dmu_buf_unlock_parent(db, dblt, FTAG);
	if (dirty) {
	dmu_buf_will_dirty(&db->db, tx);
	data = db->db.db_data;
	bzero(data + blkoff, head);
	}
	dbuf_rele(db, FTAG);
	}
	off += head;
	len -= head;
	}

	/* If the range was less than one block, we're done */
	if (len == 0)
	return;

	/* If the remaining range is past end of file, we're done */
	if ((off >> blkshift) > dn->dn_maxblkid)
	return;

	ASSERT(ISP2(blksz));
	if (trunc)
	tail = 0;
	else
	tail = P2PHASE(len, blksz);

	ASSERT0(P2PHASE(off, blksz));
	/* zero out any partial block data at the end of the range */
	if (tail) {
	int res;
	if (len < tail)
	tail = len;
	rw_enter(&dn->dn_struct_rwlock, RW_READER);
	res = dbuf_hold_impl(dn, 0, dbuf_whichblock(dn, 0, off+len),
	TRUE, FALSE, FTAG, &db);
	rw_exit(&dn->dn_struct_rwlock);
	if (res == 0) {
	boolean_t dirty;
	/* don't dirty if not on disk and not dirty */
	db_lock_type_t type = dmu_buf_lock_parent(db, RW_READER,
	FTAG);
	dirty = !list_is_empty(&db->db_dirty_records) \|\|
	(db->db_blkptr && !BP_IS_HOLE(db->db_blkptr));
	dmu_buf_unlock_parent(db, type, FTAG);
	if (dirty) {
	dmu_buf_will_dirty(&db->db, tx);
	bzero(db->db.db_data, tail);
	}
	dbuf_rele(db, FTAG);
	}
	len -= tail;
	}

	/* If the range did not include a full block, we are done */
	if (len == 0)
	return;

	ASSERT(IS_P2ALIGNED(off, blksz));
	ASSERT(trunc \|\| IS_P2ALIGNED(len, blksz));
	blkid = off >> blkshift;
	nblks = len >> blkshift;
	if (trunc)
	nblks += 1;

	/*
	* Dirty all the indirect blocks in this range. Note that only
	* the first and last indirect blocks can actually be written
	* (if they were partially freed) -- they must be dirtied, even if
	* they do not exist on disk yet. The interior blocks will
	* be freed by free_children(), so they will not actually be written.
	* Even though these interior blocks will not be written, we
	* dirty them for two reasons:
	*
	* - It ensures that the indirect blocks remain in memory until
	* syncing context. (They have already been prefetched by
	* dmu_tx_hold_free(), so we don't have to worry about reading
	* them serially here.)
	*
	* - The dirty space accounting will put pressure on the txg sync
	* mechanism to begin syncing, and to delay transactions if there
	* is a large amount of freeing. Even though these indirect
	* blocks will not be written, we could need to write the same
	* amount of space if we copy the freed BPs into deadlists.
	*/
	if (dn->dn_nlevels > 1) {
	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
	uint64_t first, last;

	first = blkid >> epbs;
	dnode_dirty_l1(dn, first, tx);
	if (trunc)
	last = dn->dn_maxblkid >> epbs;
	else
	last = (blkid + nblks - 1) >> epbs;
	if (last != first)
	dnode_dirty_l1(dn, last, tx);

	dnode_dirty_l1range(dn, first, last, tx);

	int shift = dn->dn_datablkshift + dn->dn_indblkshift -
	SPA_BLKPTRSHIFT;
	for (uint64_t i = first + 1; i < last; i++) {
	/*
	* Set i to the blockid of the next non-hole
	* level-1 indirect block at or after i. Note
	* that dnode_next_offset() operates in terms of
	* level-0-equivalent bytes.
	*/
	uint64_t ibyte = i << shift;
	int err = dnode_next_offset(dn, DNODE_FIND_HAVELOCK,
	&ibyte, 2, 1, 0);
	i = ibyte >> shift;
	if (i >= last)
	break;

	/*
	* Normally we should not see an error, either
	* from dnode_next_offset() or dbuf_hold_level()
	* (except for ESRCH from dnode_next_offset).
	* If there is an i/o error, then when we read
	* this block in syncing context, it will use
	* ZIO_FLAG_MUSTSUCCEED, and thus hang/panic according
	* to the "failmode" property. dnode_next_offset()
	* doesn't have a flag to indicate MUSTSUCCEED.
	*/
	if (err != 0)
	break;

	dnode_dirty_l1(dn, i, tx);
	}
	rw_exit(&dn->dn_struct_rwlock);
	}

	done:
	/*
	* Add this range to the dnode range list.
	* We will finish up this free operation in the syncing phase.
	*/
	mutex_enter(&dn->dn_mtx);
	{
	int txgoff = tx->tx_txg & TXG_MASK;
	if (dn->dn_free_ranges[txgoff] == NULL) {
	dn->dn_free_ranges[txgoff] = range_tree_create(NULL,
	RANGE_SEG64, NULL, 0, 0);
	}
	range_tree_clear(dn->dn_free_ranges[txgoff], blkid, nblks);
	range_tree_add(dn->dn_free_ranges[txgoff], blkid, nblks);
	}
	dprintf_dnode(dn, "blkid=%llu nblks=%llu txg=%llu\n",
	(u_longlong_t)blkid, (u_longlong_t)nblks,
	(u_longlong_t)tx->tx_txg);
	mutex_exit(&dn->dn_mtx);

	dbuf_free_range(dn, blkid, blkid + nblks - 1, tx);
	dnode_setdirty(dn, tx);
	}

	static boolean_t
	dnode_spill_freed(dnode_t *dn)
	{
	int i;

	mutex_enter(&dn->dn_mtx);
	for (i = 0; i < TXG_SIZE; i++) {
	if (dn->dn_rm_spillblk[i] == DN_KILL_SPILLBLK)
	break;
	}
	mutex_exit(&dn->dn_mtx);
	return (i < TXG_SIZE);
	}

	/* return TRUE if this blkid was freed in a recent txg, or FALSE if it wasn't */
	uint64_t
	dnode_block_freed(dnode_t *dn, uint64_t blkid)
	{
	void *dp = spa_get_dsl(dn->dn_objset->os_spa);
	int i;

	if (blkid == DMU_BONUS_BLKID)
	return (FALSE);

	/*
	* If we're in the process of opening the pool, dp will not be
	* set yet, but there shouldn't be anything dirty.
	*/
	if (dp == NULL)
	return (FALSE);

	if (dn->dn_free_txg)
	return (TRUE);

	if (blkid == DMU_SPILL_BLKID)
	return (dnode_spill_freed(dn));

	mutex_enter(&dn->dn_mtx);
	for (i = 0; i < TXG_SIZE; i++) {
	if (dn->dn_free_ranges[i] != NULL &&
	range_tree_contains(dn->dn_free_ranges[i], blkid, 1))
	break;
	}
	mutex_exit(&dn->dn_mtx);
	return (i < TXG_SIZE);
	}

	/* call from syncing context when we actually write/free space for this dnode */
	void
	dnode_diduse_space(dnode_t *dn, int64_t delta)
	{
	uint64_t space;
	dprintf_dnode(dn, "dn=%p dnp=%p used=%llu delta=%lld\n",
	dn, dn->dn_phys,
	(u_longlong_t)dn->dn_phys->dn_used,
	(longlong_t)delta);

	mutex_enter(&dn->dn_mtx);
	space = DN_USED_BYTES(dn->dn_phys);
	if (delta > 0) {
	ASSERT3U(space + delta, >=, space); /* no overflow */
	} else {
	ASSERT3U(space, >=, -delta); /* no underflow */
	}
	space += delta;
	if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_DNODE_BYTES) {
	ASSERT((dn->dn_phys->dn_flags & DNODE_FLAG_USED_BYTES) == 0);
	ASSERT0(P2PHASE(space, 1<<DEV_BSHIFT));
	dn->dn_phys->dn_used = space >> DEV_BSHIFT;
	} else {
	dn->dn_phys->dn_used = space;
	dn->dn_phys->dn_flags \|= DNODE_FLAG_USED_BYTES;
	}
	mutex_exit(&dn->dn_mtx);
	}

	/*
	* Scans a block at the indicated "level" looking for a hole or data,
	* depending on 'flags'.
	*
	* If level > 0, then we are scanning an indirect block looking at its
	* pointers. If level == 0, then we are looking at a block of dnodes.
	*
	* If we don't find what we are looking for in the block, we return ESRCH.
	* Otherwise, return with *offset pointing to the beginning (if searching
	* forwards) or end (if searching backwards) of the range covered by the
	* block pointer we matched on (or dnode).
	*
	* The basic search algorithm used below by dnode_next_offset() is to
	* use this function to search up the block tree (widen the search) until
	* we find something (i.e., we don't return ESRCH) and then search back
	* down the tree (narrow the search) until we reach our original search
	* level.
	*/
	static int
	dnode_next_offset_level(dnode_t dn, int flags, uint64_t offset,
	int lvl, uint64_t blkfill, uint64_t txg)
	{
	dmu_buf_impl_t *db = NULL;
	void *data = NULL;
	uint64_t epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
	uint64_t epb = 1ULL << epbs;
	uint64_t minfill, maxfill;
	boolean_t hole;
	int i, inc, error, span;

	ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));

	hole = ((flags & DNODE_FIND_HOLE) != 0);
	inc = (flags & DNODE_FIND_BACKWARDS) ? -1 : 1;
	ASSERT(txg == 0 \|\| !hole);

	if (lvl == dn->dn_phys->dn_nlevels) {
	error = 0;
	epb = dn->dn_phys->dn_nblkptr;
	data = dn->dn_phys->dn_blkptr;
	} else {
	uint64_t blkid = dbuf_whichblock(dn, lvl, *offset);
	error = dbuf_hold_impl(dn, lvl, blkid, TRUE, FALSE, FTAG, &db);
	if (error) {
	if (error != ENOENT)
	return (error);
	if (hole)
	return (0);
	/*
	* This can only happen when we are searching up
	* the block tree for data. We don't really need to
	* adjust the offset, as we will just end up looking
	* at the pointer to this block in its parent, and its
	* going to be unallocated, so we will skip over it.
	*/
	return (SET_ERROR(ESRCH));
	}
	error = dbuf_read(db, NULL,
	DB_RF_CANFAIL \| DB_RF_HAVESTRUCT \|
	DB_RF_NO_DECRYPT \| DB_RF_NOPREFETCH);
	if (error) {
	dbuf_rele(db, FTAG);
	return (error);
	}
	data = db->db.db_data;
	rw_enter(&db->db_rwlock, RW_READER);
	}

	if (db != NULL && txg != 0 && (db->db_blkptr == NULL \|\|
	db->db_blkptr->blk_birth <= txg \|\|
	BP_IS_HOLE(db->db_blkptr))) {
	/*
	* This can only happen when we are searching up the tree
	* and these conditions mean that we need to keep climbing.
	*/
	error = SET_ERROR(ESRCH);
	} else if (lvl == 0) {
	dnode_phys_t *dnp = data;

	ASSERT(dn->dn_type == DMU_OT_DNODE);
	ASSERT(!(flags & DNODE_FIND_BACKWARDS));

	for (i = (*offset >> DNODE_SHIFT) & (blkfill - 1);
	i < blkfill; i += dnp[i].dn_extra_slots + 1) {
	if ((dnp[i].dn_type == DMU_OT_NONE) == hole)
	break;
	}

	if (i == blkfill)
	error = SET_ERROR(ESRCH);

	offset = (offset & ~(DNODE_BLOCK_SIZE - 1)) +
	(i << DNODE_SHIFT);
	} else {
	blkptr_t *bp = data;
	uint64_t start = *offset;
	span = (lvl - 1) * epbs + dn->dn_datablkshift;
	minfill = 0;
	maxfill = blkfill << ((lvl - 1) * epbs);

	if (hole)
	maxfill--;
	else
	minfill++;

	if (span >= 8 * sizeof (*offset)) {
	/* This only happens on the highest indirection level */
	ASSERT3U((lvl - 1), ==, dn->dn_phys->dn_nlevels - 1);
	*offset = 0;
	} else {
	offset = offset >> span;
	}

	for (i = BF64_GET(*offset, 0, epbs);
	i >= 0 && i < epb; i += inc) {
	if (BP_GET_FILL(&bp[i]) >= minfill &&
	BP_GET_FILL(&bp[i]) <= maxfill &&
	(hole \|\| bp[i].blk_birth > txg))
	break;
	if (inc > 0 \|\| *offset > 0)
	*offset += inc;
	}

	if (span >= 8 * sizeof (*offset)) {
	*offset = start;
	} else {
	offset = offset << span;
	}

	if (inc < 0) {
	/* traversing backwards; position offset at the end */
	ASSERT3U(*offset, <=, start);
	offset = MIN(offset + (1ULL << span) - 1, start);
	} else if (*offset < start) {
	*offset = start;
	}
	if (i < 0 \|\| i >= epb)
	error = SET_ERROR(ESRCH);
	}

	if (db != NULL) {
	rw_exit(&db->db_rwlock);
	dbuf_rele(db, FTAG);
	}

	return (error);
	}

	/*
	* Find the next hole, data, or sparse region at or after *offset.
	* The value 'blkfill' tells us how many items we expect to find
	* in an L0 data block; this value is 1 for normal objects,
	* DNODES_PER_BLOCK for the meta dnode, and some fraction of
	* DNODES_PER_BLOCK when searching for sparse regions thereof.
	*
	* Examples:
	*
	* dnode_next_offset(dn, flags, offset, 1, 1, 0);
	* Finds the next/previous hole/data in a file.
	* Used in dmu_offset_next().
	*
	* dnode_next_offset(mdn, flags, offset, 0, DNODES_PER_BLOCK, txg);
	* Finds the next free/allocated dnode an objset's meta-dnode.
	* Only finds objects that have new contents since txg (ie.
	* bonus buffer changes and content removal are ignored).
	* Used in dmu_object_next().
	*
	* dnode_next_offset(mdn, DNODE_FIND_HOLE, offset, 2, DNODES_PER_BLOCK >> 2, 0);
	* Finds the next L2 meta-dnode bp that's at most 1/4 full.
	* Used in dmu_object_alloc().
	*/
	int
	dnode_next_offset(dnode_t dn, int flags, uint64_t offset,
	int minlvl, uint64_t blkfill, uint64_t txg)
	{
	uint64_t initial_offset = *offset;
	int lvl, maxlvl;
	int error = 0;

	if (!(flags & DNODE_FIND_HAVELOCK))
	rw_enter(&dn->dn_struct_rwlock, RW_READER);

	if (dn->dn_phys->dn_nlevels == 0) {
	error = SET_ERROR(ESRCH);
	goto out;
	}

	if (dn->dn_datablkshift == 0) {
	if (*offset < dn->dn_datablksz) {
	if (flags & DNODE_FIND_HOLE)
	*offset = dn->dn_datablksz;
	} else {
	error = SET_ERROR(ESRCH);
	}
	goto out;
	}

	maxlvl = dn->dn_phys->dn_nlevels;

	for (lvl = minlvl; lvl <= maxlvl; lvl++) {
	error = dnode_next_offset_level(dn,
	flags, offset, lvl, blkfill, txg);
	if (error != ESRCH)
	break;
	}

	while (error == 0 && --lvl >= minlvl) {
	error = dnode_next_offset_level(dn,
	flags, offset, lvl, blkfill, txg);
	}

	/*
	* There's always a "virtual hole" at the end of the object, even
	* if all BP's which physically exist are non-holes.
	*/
	if ((flags & DNODE_FIND_HOLE) && error == ESRCH && txg == 0 &&
	minlvl == 1 && blkfill == 1 && !(flags & DNODE_FIND_BACKWARDS)) {
	error = 0;
	}

	if (error == 0 && (flags & DNODE_FIND_BACKWARDS ?
	initial_offset < offset : initial_offset > offset))
	error = SET_ERROR(ESRCH);
	out:
	if (!(flags & DNODE_FIND_HAVELOCK))
	rw_exit(&dn->dn_struct_rwlock);

	return (error);
	}

	#if defined(_KERNEL)
	EXPORT_SYMBOL(dnode_hold);
	EXPORT_SYMBOL(dnode_rele);
	EXPORT_SYMBOL(dnode_set_nlevels);
	EXPORT_SYMBOL(dnode_set_blksz);
	EXPORT_SYMBOL(dnode_free_range);
	EXPORT_SYMBOL(dnode_evict_dbufs);
	EXPORT_SYMBOL(dnode_evict_bonus);
	#endif
	diff --git a/sys/contrib/openzfs/module/zfs/dsl_dataset.c b/sys/contrib/openzfs/module/zfs/dsl_dataset.c
	index 1c03216ef6d5..f99964511aa6 100644
	--- a/sys/contrib/openzfs/module/zfs/dsl_dataset.c
	+++ b/sys/contrib/openzfs/module/zfs/dsl_dataset.c
	@@ -1,5013 +1,5011 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2014, Joyent, Inc. All rights reserved.
	* Copyright (c) 2014 RackTop Systems.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	* Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved.
	* Copyright 2017 Nexenta Systems, Inc.
	* Copyright (c) 2019, Klara Inc.
	* Copyright (c) 2019, Allan Jude
	* Copyright (c) 2020 The FreeBSD Foundation [1]
	*
	* [1] Portions of this software were developed by Allan Jude
	* under sponsorship from the FreeBSD Foundation.
	*/

	#include <sys/dmu_objset.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_synctask.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dmu_impl.h>
	#include <sys/dmu_tx.h>
	#include <sys/arc.h>
	#include <sys/zio.h>
	#include <sys/zap.h>
	#include <sys/zfeature.h>
	#include <sys/unique.h>
	#include <sys/zfs_context.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/vdev.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_onexit.h>
	#include <sys/zvol.h>
	#include <sys/dsl_scan.h>
	#include <sys/dsl_deadlist.h>
	#include <sys/dsl_destroy.h>
	#include <sys/dsl_userhold.h>
	#include <sys/dsl_bookmark.h>
	#include <sys/policy.h>
	#include <sys/dmu_send.h>
	#include <sys/dmu_recv.h>
	#include <sys/zio_compress.h>
	#include <zfs_fletcher.h>
	#include <sys/zio_checksum.h>

	/*
	* The SPA supports block sizes up to 16MB. However, very large blocks
	* can have an impact on i/o latency (e.g. tying up a spinning disk for
	* ~300ms), and also potentially on the memory allocator. Therefore,
	* we do not allow the recordsize to be set larger than zfs_max_recordsize
	* (default 1MB). Larger blocks can be created by changing this tunable,
	* and pools with larger blocks can always be imported and used, regardless
	* of this setting.
	*/
	int zfs_max_recordsize = 1 * 1024 * 1024;
	int zfs_allow_redacted_dataset_mount = 0;

	#define SWITCH64(x, y) \
	{ \
	uint64_t __tmp = (x); \
	(x) = (y); \
	(y) = __tmp; \
	}

	#define DS_REF_MAX (1ULL << 62)

	extern inline dsl_dataset_phys_t dsl_dataset_phys(dsl_dataset_t ds);

	static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds,
	uint64_t obj, dmu_tx_t *tx);
	static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds,
	dmu_tx_t *tx);

	static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f);

	extern int spa_asize_inflation;

	static zil_header_t zero_zil;

	/*
	* Figure out how much of this delta should be propagated to the dsl_dir
	* layer. If there's a refreservation, that space has already been
	* partially accounted for in our ancestors.
	*/
	static int64_t
	parent_delta(dsl_dataset_t *ds, int64_t delta)
	{
	dsl_dataset_phys_t *ds_phys;
	uint64_t old_bytes, new_bytes;

	if (ds->ds_reserved == 0)
	return (delta);

	ds_phys = dsl_dataset_phys(ds);
	old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
	new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);

	ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
	return (new_bytes - old_bytes);
	}

	void
	dsl_dataset_block_born(dsl_dataset_t ds, const blkptr_t bp, dmu_tx_t *tx)
	{
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	int used = bp_get_dsize_sync(spa, bp);
	int compressed = BP_GET_PSIZE(bp);
	int uncompressed = BP_GET_UCSIZE(bp);
	int64_t delta;
	spa_feature_t f;

	dprintf_bp(bp, "ds=%p", ds);

	ASSERT(dmu_tx_is_syncing(tx));
	/* It could have been compressed away to nothing */
	if (BP_IS_HOLE(bp) \|\| BP_IS_REDACTED(bp))
	return;
	ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
	ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
	if (ds == NULL) {
	dsl_pool_mos_diduse_space(tx->tx_pool,
	used, compressed, uncompressed);
	return;
	}

	ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
	dmu_buf_will_dirty(ds->ds_dbuf, tx);
	mutex_enter(&ds->ds_lock);
	delta = parent_delta(ds, used);
	dsl_dataset_phys(ds)->ds_referenced_bytes += used;
	dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
	dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
	dsl_dataset_phys(ds)->ds_unique_bytes += used;

	if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
	ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] =
	(void *)B_TRUE;
	}


	f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
	if (f != SPA_FEATURE_NONE) {
	ASSERT3S(spa_feature_table[f].fi_type, ==,
	ZFEATURE_TYPE_BOOLEAN);
	ds->ds_feature_activation[f] = (void *)B_TRUE;
	}

	f = zio_compress_to_feature(BP_GET_COMPRESS(bp));
	if (f != SPA_FEATURE_NONE) {
	ASSERT3S(spa_feature_table[f].fi_type, ==,
	ZFEATURE_TYPE_BOOLEAN);
	ds->ds_feature_activation[f] = (void *)B_TRUE;
	}

	/*
	* Track block for livelist, but ignore embedded blocks because
	* they do not need to be freed.
	*/
	if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
	bp->blk_birth > ds->ds_dir->dd_origin_txg &&
	!(BP_IS_EMBEDDED(bp))) {
	ASSERT(dsl_dir_is_clone(ds->ds_dir));
	ASSERT(spa_feature_is_enabled(spa,
	SPA_FEATURE_LIVELIST));
	bplist_append(&ds->ds_dir->dd_pending_allocs, bp);
	}

	mutex_exit(&ds->ds_lock);
	- dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
	- compressed, uncompressed, tx);
	- dsl_dir_transfer_space(ds->ds_dir, used - delta,
	+ dsl_dir_diduse_transfer_space(ds->ds_dir, delta,
	+ compressed, uncompressed, used,
	DD_USED_REFRSRV, DD_USED_HEAD, tx);
	}

	/*
	* Called when the specified segment has been remapped, and is thus no
	* longer referenced in the head dataset. The vdev must be indirect.
	*
	* If the segment is referenced by a snapshot, put it on the remap deadlist.
	* Otherwise, add this segment to the obsolete spacemap.
	*/
	void
	dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset,
	uint64_t size, uint64_t birth, dmu_tx_t *tx)
	{
	spa_t *spa = ds->ds_dir->dd_pool->dp_spa;

	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(birth <= tx->tx_txg);
	ASSERT(!ds->ds_is_snapshot);

	if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
	spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx);
	} else {
	blkptr_t fakebp;
	dva_t *dva = &fakebp.blk_dva[0];

	ASSERT(ds != NULL);

	mutex_enter(&ds->ds_remap_deadlist_lock);
	if (!dsl_dataset_remap_deadlist_exists(ds)) {
	dsl_dataset_create_remap_deadlist(ds, tx);
	}
	mutex_exit(&ds->ds_remap_deadlist_lock);

	BP_ZERO(&fakebp);
	fakebp.blk_birth = birth;
	DVA_SET_VDEV(dva, vdev);
	DVA_SET_OFFSET(dva, offset);
	DVA_SET_ASIZE(dva, size);
	dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, B_FALSE,
	tx);
	}
	}

	int
	dsl_dataset_block_kill(dsl_dataset_t ds, const blkptr_t bp, dmu_tx_t *tx,
	boolean_t async)
	{
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;

	int used = bp_get_dsize_sync(spa, bp);
	int compressed = BP_GET_PSIZE(bp);
	int uncompressed = BP_GET_UCSIZE(bp);

	if (BP_IS_HOLE(bp) \|\| BP_IS_REDACTED(bp))
	return (0);

	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(bp->blk_birth <= tx->tx_txg);

	if (ds == NULL) {
	dsl_free(tx->tx_pool, tx->tx_txg, bp);
	dsl_pool_mos_diduse_space(tx->tx_pool,
	-used, -compressed, -uncompressed);
	return (used);
	}
	ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);

	ASSERT(!ds->ds_is_snapshot);
	dmu_buf_will_dirty(ds->ds_dbuf, tx);

	/*
	* Track block for livelist, but ignore embedded blocks because
	* they do not need to be freed.
	*/
	if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
	bp->blk_birth > ds->ds_dir->dd_origin_txg &&
	!(BP_IS_EMBEDDED(bp))) {
	ASSERT(dsl_dir_is_clone(ds->ds_dir));
	ASSERT(spa_feature_is_enabled(spa,
	SPA_FEATURE_LIVELIST));
	bplist_append(&ds->ds_dir->dd_pending_frees, bp);
	}

	if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
	int64_t delta;

	dprintf_bp(bp, "freeing ds=%llu", (u_longlong_t)ds->ds_object);
	dsl_free(tx->tx_pool, tx->tx_txg, bp);

	mutex_enter(&ds->ds_lock);
	ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used \|\|
	!DS_UNIQUE_IS_ACCURATE(ds));
	delta = parent_delta(ds, -used);
	dsl_dataset_phys(ds)->ds_unique_bytes -= used;
	mutex_exit(&ds->ds_lock);
	- dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
	- delta, -compressed, -uncompressed, tx);
	- dsl_dir_transfer_space(ds->ds_dir, -used - delta,
	+ dsl_dir_diduse_transfer_space(ds->ds_dir,
	+ delta, -compressed, -uncompressed, -used,
	DD_USED_REFRSRV, DD_USED_HEAD, tx);
	} else {
	dprintf_bp(bp, "putting on dead list: %s", "");
	if (async) {
	/*
	* We are here as part of zio's write done callback,
	* which means we're a zio interrupt thread. We can't
	* call dsl_deadlist_insert() now because it may block
	* waiting for I/O. Instead, put bp on the deferred
	* queue and let dsl_pool_sync() finish the job.
	*/
	bplist_append(&ds->ds_pending_deadlist, bp);
	} else {
	dsl_deadlist_insert(&ds->ds_deadlist, bp, B_FALSE, tx);
	}
	ASSERT3U(ds->ds_prev->ds_object, ==,
	dsl_dataset_phys(ds)->ds_prev_snap_obj);
	ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
	/* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
	if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
	ds->ds_object && bp->blk_birth >
	dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
	dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
	mutex_enter(&ds->ds_prev->ds_lock);
	dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
	mutex_exit(&ds->ds_prev->ds_lock);
	}
	if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
	dsl_dir_transfer_space(ds->ds_dir, used,
	DD_USED_HEAD, DD_USED_SNAP, tx);
	}
	}

	dsl_bookmark_block_killed(ds, bp, tx);

	mutex_enter(&ds->ds_lock);
	ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
	dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
	ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
	dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
	ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
	dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
	mutex_exit(&ds->ds_lock);

	return (used);
	}

	struct feature_type_uint64_array_arg {
	uint64_t length;
	uint64_t *array;
	};

	static void
	unload_zfeature(dsl_dataset_t *ds, spa_feature_t f)
	{
	switch (spa_feature_table[f].fi_type) {
	case ZFEATURE_TYPE_BOOLEAN:
	break;
	case ZFEATURE_TYPE_UINT64_ARRAY:
	{
	struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f];
	kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t));
	kmem_free(ftuaa, sizeof (*ftuaa));
	break;
	}
	default:
	panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
	}
	}

	static int
	load_zfeature(objset_t mos, dsl_dataset_t ds, spa_feature_t f)
	{
	int err = 0;
	switch (spa_feature_table[f].fi_type) {
	case ZFEATURE_TYPE_BOOLEAN:
	err = zap_contains(mos, ds->ds_object,
	spa_feature_table[f].fi_guid);
	if (err == 0) {
	ds->ds_feature[f] = (void *)B_TRUE;
	} else {
	ASSERT3U(err, ==, ENOENT);
	err = 0;
	}
	break;
	case ZFEATURE_TYPE_UINT64_ARRAY:
	{
	uint64_t int_size, num_int;
	uint64_t *data;
	err = zap_length(mos, ds->ds_object,
	spa_feature_table[f].fi_guid, &int_size, &num_int);
	if (err != 0) {
	ASSERT3U(err, ==, ENOENT);
	err = 0;
	break;
	}
	ASSERT3U(int_size, ==, sizeof (uint64_t));
	data = kmem_alloc(int_size * num_int, KM_SLEEP);
	VERIFY0(zap_lookup(mos, ds->ds_object,
	spa_feature_table[f].fi_guid, int_size, num_int, data));
	struct feature_type_uint64_array_arg *ftuaa =
	kmem_alloc(sizeof (*ftuaa), KM_SLEEP);
	ftuaa->length = num_int;
	ftuaa->array = data;
	ds->ds_feature[f] = ftuaa;
	break;
	}
	default:
	panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
	}
	return (err);
	}

	/*
	* We have to release the fsid synchronously or we risk that a subsequent
	* mount of the same dataset will fail to unique_insert the fsid. This
	* failure would manifest itself as the fsid of this dataset changing
	* between mounts which makes NFS clients quite unhappy.
	*/
	static void
	dsl_dataset_evict_sync(void *dbu)
	{
	dsl_dataset_t *ds = dbu;

	ASSERT(ds->ds_owner == NULL);

	unique_remove(ds->ds_fsid_guid);
	}

	static void
	dsl_dataset_evict_async(void *dbu)
	{
	dsl_dataset_t *ds = dbu;

	ASSERT(ds->ds_owner == NULL);

	ds->ds_dbuf = NULL;

	if (ds->ds_objset != NULL)
	dmu_objset_evict(ds->ds_objset);

	if (ds->ds_prev) {
	dsl_dataset_rele(ds->ds_prev, ds);
	ds->ds_prev = NULL;
	}

	dsl_bookmark_fini_ds(ds);

	bplist_destroy(&ds->ds_pending_deadlist);
	if (dsl_deadlist_is_open(&ds->ds_deadlist))
	dsl_deadlist_close(&ds->ds_deadlist);
	if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
	dsl_deadlist_close(&ds->ds_remap_deadlist);
	if (ds->ds_dir)
	dsl_dir_async_rele(ds->ds_dir, ds);

	ASSERT(!list_link_active(&ds->ds_synced_link));

	for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
	if (dsl_dataset_feature_is_active(ds, f))
	unload_zfeature(ds, f);
	}

	list_destroy(&ds->ds_prop_cbs);
	mutex_destroy(&ds->ds_lock);
	mutex_destroy(&ds->ds_opening_lock);
	mutex_destroy(&ds->ds_sendstream_lock);
	mutex_destroy(&ds->ds_remap_deadlist_lock);
	zfs_refcount_destroy(&ds->ds_longholds);
	rrw_destroy(&ds->ds_bp_rwlock);

	kmem_free(ds, sizeof (dsl_dataset_t));
	}

	int
	dsl_dataset_get_snapname(dsl_dataset_t *ds)
	{
	dsl_dataset_phys_t *headphys;
	int err;
	dmu_buf_t *headdbuf;
	dsl_pool_t *dp = ds->ds_dir->dd_pool;
	objset_t *mos = dp->dp_meta_objset;

	if (ds->ds_snapname[0])
	return (0);
	if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
	return (0);

	err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
	FTAG, &headdbuf);
	if (err != 0)
	return (err);
	headphys = headdbuf->db_data;
	err = zap_value_search(dp->dp_meta_objset,
	headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
	if (err != 0 && zfs_recover == B_TRUE) {
	err = 0;
	(void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname),
	"SNAPOBJ=%llu-ERR=%d",
	(unsigned long long)ds->ds_object, err);
	}
	dmu_buf_rele(headdbuf, FTAG);
	return (err);
	}

	int
	dsl_dataset_snap_lookup(dsl_dataset_t ds, const char name, uint64_t *value)
	{
	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
	uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
	matchtype_t mt = 0;
	int err;

	if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
	mt = MT_NORMALIZE;

	err = zap_lookup_norm(mos, snapobj, name, 8, 1,
	value, mt, NULL, 0, NULL);
	if (err == ENOTSUP && (mt & MT_NORMALIZE))
	err = zap_lookup(mos, snapobj, name, 8, 1, value);
	return (err);
	}

	int
	dsl_dataset_snap_remove(dsl_dataset_t ds, const char name, dmu_tx_t *tx,
	boolean_t adj_cnt)
	{
	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
	uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
	matchtype_t mt = 0;
	int err;

	dsl_dir_snap_cmtime_update(ds->ds_dir);

	if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
	mt = MT_NORMALIZE;

	err = zap_remove_norm(mos, snapobj, name, mt, tx);
	if (err == ENOTSUP && (mt & MT_NORMALIZE))
	err = zap_remove(mos, snapobj, name, tx);

	if (err == 0 && adj_cnt)
	dsl_fs_ss_count_adjust(ds->ds_dir, -1,
	DD_FIELD_SNAPSHOT_COUNT, tx);

	return (err);
	}

	boolean_t
	dsl_dataset_try_add_ref(dsl_pool_t dp, dsl_dataset_t ds, void *tag)
	{
	dmu_buf_t *dbuf = ds->ds_dbuf;
	boolean_t result = B_FALSE;

	if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
	ds->ds_object, DMU_BONUS_BLKID, tag)) {

	if (ds == dmu_buf_get_user(dbuf))
	result = B_TRUE;
	else
	dmu_buf_rele(dbuf, tag);
	}

	return (result);
	}

	int
	dsl_dataset_hold_obj(dsl_pool_t dp, uint64_t dsobj, void tag,
	dsl_dataset_t **dsp)
	{
	objset_t *mos = dp->dp_meta_objset;
	dmu_buf_t *dbuf;
	dsl_dataset_t *ds;
	int err;
	dmu_object_info_t doi;

	ASSERT(dsl_pool_config_held(dp));

	err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
	if (err != 0)
	return (err);

	/* Make sure dsobj has the correct object type. */
	dmu_object_info_from_db(dbuf, &doi);
	if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
	dmu_buf_rele(dbuf, tag);
	return (SET_ERROR(EINVAL));
	}

	ds = dmu_buf_get_user(dbuf);
	if (ds == NULL) {
	dsl_dataset_t *winner = NULL;

	ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
	ds->ds_dbuf = dbuf;
	ds->ds_object = dsobj;
	ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
	list_link_init(&ds->ds_synced_link);

	err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj,
	NULL, ds, &ds->ds_dir);
	if (err != 0) {
	kmem_free(ds, sizeof (dsl_dataset_t));
	dmu_buf_rele(dbuf, tag);
	return (err);
	}

	mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&ds->ds_remap_deadlist_lock,
	NULL, MUTEX_DEFAULT, NULL);
	rrw_init(&ds->ds_bp_rwlock, B_FALSE);
	zfs_refcount_create(&ds->ds_longholds);

	bplist_create(&ds->ds_pending_deadlist);

	list_create(&ds->ds_sendstreams, sizeof (dmu_sendstatus_t),
	offsetof(dmu_sendstatus_t, dss_link));

	list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
	offsetof(dsl_prop_cb_record_t, cbr_ds_node));

	if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
	spa_feature_t f;

	for (f = 0; f < SPA_FEATURES; f++) {
	if (!(spa_feature_table[f].fi_flags &
	ZFEATURE_FLAG_PER_DATASET))
	continue;
	err = load_zfeature(mos, ds, f);
	}
	}

	if (!ds->ds_is_snapshot) {
	ds->ds_snapname[0] = '\0';
	if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
	err = dsl_dataset_hold_obj(dp,
	dsl_dataset_phys(ds)->ds_prev_snap_obj,
	ds, &ds->ds_prev);
	}
	err = dsl_bookmark_init_ds(ds);
	} else {
	if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
	err = dsl_dataset_get_snapname(ds);
	if (err == 0 &&
	dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
	err = zap_count(
	ds->ds_dir->dd_pool->dp_meta_objset,
	dsl_dataset_phys(ds)->ds_userrefs_obj,
	&ds->ds_userrefs);
	}
	}

	if (err == 0 && !ds->ds_is_snapshot) {
	err = dsl_prop_get_int_ds(ds,
	zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
	&ds->ds_reserved);
	if (err == 0) {
	err = dsl_prop_get_int_ds(ds,
	zfs_prop_to_name(ZFS_PROP_REFQUOTA),
	&ds->ds_quota);
	}
	} else {
	ds->ds_reserved = ds->ds_quota = 0;
	}

	if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 &&
	ds->ds_is_snapshot &&
	zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) {
	dp->dp_spa->spa_errata =
	ZPOOL_ERRATA_ZOL_8308_ENCRYPTION;
	}

	dsl_deadlist_open(&ds->ds_deadlist,
	mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
	uint64_t remap_deadlist_obj =
	dsl_dataset_get_remap_deadlist_object(ds);
	if (remap_deadlist_obj != 0) {
	dsl_deadlist_open(&ds->ds_remap_deadlist, mos,
	remap_deadlist_obj);
	}

	dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync,
	dsl_dataset_evict_async, &ds->ds_dbuf);
	if (err == 0)
	winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);

	if (err != 0 \|\| winner != NULL) {
	bplist_destroy(&ds->ds_pending_deadlist);
	dsl_deadlist_close(&ds->ds_deadlist);
	if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
	dsl_deadlist_close(&ds->ds_remap_deadlist);
	dsl_bookmark_fini_ds(ds);
	if (ds->ds_prev)
	dsl_dataset_rele(ds->ds_prev, ds);
	dsl_dir_rele(ds->ds_dir, ds);
	for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
	if (dsl_dataset_feature_is_active(ds, f))
	unload_zfeature(ds, f);
	}

	list_destroy(&ds->ds_prop_cbs);
	list_destroy(&ds->ds_sendstreams);
	mutex_destroy(&ds->ds_lock);
	mutex_destroy(&ds->ds_opening_lock);
	mutex_destroy(&ds->ds_sendstream_lock);
	mutex_destroy(&ds->ds_remap_deadlist_lock);
	zfs_refcount_destroy(&ds->ds_longholds);
	rrw_destroy(&ds->ds_bp_rwlock);
	kmem_free(ds, sizeof (dsl_dataset_t));
	if (err != 0) {
	dmu_buf_rele(dbuf, tag);
	return (err);
	}
	ds = winner;
	} else {
	ds->ds_fsid_guid =
	unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
	if (ds->ds_fsid_guid !=
	dsl_dataset_phys(ds)->ds_fsid_guid) {
	zfs_dbgmsg("ds_fsid_guid changed from "
	"%llx to %llx for pool %s dataset id %llu",
	(long long)
	dsl_dataset_phys(ds)->ds_fsid_guid,
	(long long)ds->ds_fsid_guid,
	spa_name(dp->dp_spa),
	(u_longlong_t)dsobj);
	}
	}
	}

	ASSERT3P(ds->ds_dbuf, ==, dbuf);
	ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
	ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 \|\|
	spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN \|\|
	dp->dp_origin_snap == NULL \|\| ds == dp->dp_origin_snap);
	*dsp = ds;

	return (0);
	}

	int
	dsl_dataset_create_key_mapping(dsl_dataset_t *ds)
	{
	dsl_dir_t *dd = ds->ds_dir;

	if (dd->dd_crypto_obj == 0)
	return (0);

	return (spa_keystore_create_mapping(dd->dd_pool->dp_spa,
	ds, ds, &ds->ds_key_mapping));
	}

	int
	dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj,
	ds_hold_flags_t flags, void tag, dsl_dataset_t *dsp)
	{
	int err;

	err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
	if (err != 0)
	return (err);

	ASSERT3P(*dsp, !=, NULL);

	if (flags & DS_HOLD_FLAG_DECRYPT) {
	err = dsl_dataset_create_key_mapping(*dsp);
	if (err != 0)
	dsl_dataset_rele(*dsp, tag);
	}

	return (err);
	}

	int
	dsl_dataset_hold_flags(dsl_pool_t dp, const char name, ds_hold_flags_t flags,
	void tag, dsl_dataset_t *dsp)
	{
	dsl_dir_t *dd;
	const char *snapname;
	uint64_t obj;
	int err = 0;
	dsl_dataset_t *ds;

	err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
	if (err != 0)
	return (err);

	ASSERT(dsl_pool_config_held(dp));
	obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
	if (obj != 0)
	err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds);
	else
	err = SET_ERROR(ENOENT);

	/* we may be looking for a snapshot */
	if (err == 0 && snapname != NULL) {
	dsl_dataset_t *snap_ds;

	if (*snapname++ != '@') {
	dsl_dataset_rele_flags(ds, flags, tag);
	dsl_dir_rele(dd, FTAG);
	return (SET_ERROR(ENOENT));
	}

	dprintf("looking for snapshot '%s'\n", snapname);
	err = dsl_dataset_snap_lookup(ds, snapname, &obj);
	if (err == 0) {
	err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag,
	&snap_ds);
	}
	dsl_dataset_rele_flags(ds, flags, tag);

	if (err == 0) {
	mutex_enter(&snap_ds->ds_lock);
	if (snap_ds->ds_snapname[0] == 0)
	(void) strlcpy(snap_ds->ds_snapname, snapname,
	sizeof (snap_ds->ds_snapname));
	mutex_exit(&snap_ds->ds_lock);
	ds = snap_ds;
	}
	}
	if (err == 0)
	*dsp = ds;
	dsl_dir_rele(dd, FTAG);
	return (err);
	}

	int
	dsl_dataset_hold(dsl_pool_t dp, const char name, void *tag,
	dsl_dataset_t **dsp)
	{
	return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp));
	}

	static int
	dsl_dataset_own_obj_impl(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags,
	void tag, boolean_t override, dsl_dataset_t *dsp)
	{
	int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp);
	if (err != 0)
	return (err);
	if (!dsl_dataset_tryown(*dsp, tag, override)) {
	dsl_dataset_rele_flags(*dsp, flags, tag);
	*dsp = NULL;
	return (SET_ERROR(EBUSY));
	}
	return (0);
	}


	int
	dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags,
	void tag, dsl_dataset_t *dsp)
	{
	return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_FALSE, dsp));
	}

	int
	dsl_dataset_own_obj_force(dsl_pool_t *dp, uint64_t dsobj,
	ds_hold_flags_t flags, void tag, dsl_dataset_t *dsp)
	{
	return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_TRUE, dsp));
	}

	static int
	dsl_dataset_own_impl(dsl_pool_t dp, const char name, ds_hold_flags_t flags,
	void tag, boolean_t override, dsl_dataset_t *dsp)
	{
	int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp);
	if (err != 0)
	return (err);
	if (!dsl_dataset_tryown(*dsp, tag, override)) {
	dsl_dataset_rele_flags(*dsp, flags, tag);
	return (SET_ERROR(EBUSY));
	}
	return (0);
	}

	int
	dsl_dataset_own_force(dsl_pool_t dp, const char name, ds_hold_flags_t flags,
	void tag, dsl_dataset_t *dsp)
	{
	return (dsl_dataset_own_impl(dp, name, flags, tag, B_TRUE, dsp));
	}

	int
	dsl_dataset_own(dsl_pool_t dp, const char name, ds_hold_flags_t flags,
	void tag, dsl_dataset_t *dsp)
	{
	return (dsl_dataset_own_impl(dp, name, flags, tag, B_FALSE, dsp));
	}

	/*
	* See the comment above dsl_pool_hold() for details. In summary, a long
	* hold is used to prevent destruction of a dataset while the pool hold
	* is dropped, allowing other concurrent operations (e.g. spa_sync()).
	*
	* The dataset and pool must be held when this function is called. After it
	* is called, the pool hold may be released while the dataset is still held
	* and accessed.
	*/
	void
	dsl_dataset_long_hold(dsl_dataset_t ds, void tag)
	{
	ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
	(void) zfs_refcount_add(&ds->ds_longholds, tag);
	}

	void
	dsl_dataset_long_rele(dsl_dataset_t ds, void tag)
	{
	(void) zfs_refcount_remove(&ds->ds_longholds, tag);
	}

	/* Return B_TRUE if there are any long holds on this dataset. */
	boolean_t
	dsl_dataset_long_held(dsl_dataset_t *ds)
	{
	return (!zfs_refcount_is_zero(&ds->ds_longholds));
	}

	void
	dsl_dataset_name(dsl_dataset_t ds, char name)
	{
	if (ds == NULL) {
	(void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN);
	} else {
	dsl_dir_name(ds->ds_dir, name);
	VERIFY0(dsl_dataset_get_snapname(ds));
	if (ds->ds_snapname[0]) {
	VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN),
	<, ZFS_MAX_DATASET_NAME_LEN);
	/*
	* We use a "recursive" mutex so that we
	* can call dprintf_ds() with ds_lock held.
	*/
	if (!MUTEX_HELD(&ds->ds_lock)) {
	mutex_enter(&ds->ds_lock);
	VERIFY3U(strlcat(name, ds->ds_snapname,
	ZFS_MAX_DATASET_NAME_LEN), <,
	ZFS_MAX_DATASET_NAME_LEN);
	mutex_exit(&ds->ds_lock);
	} else {
	VERIFY3U(strlcat(name, ds->ds_snapname,
	ZFS_MAX_DATASET_NAME_LEN), <,
	ZFS_MAX_DATASET_NAME_LEN);
	}
	}
	}
	}

	int
	dsl_dataset_namelen(dsl_dataset_t *ds)
	{
	VERIFY0(dsl_dataset_get_snapname(ds));
	mutex_enter(&ds->ds_lock);
	int len = strlen(ds->ds_snapname);
	mutex_exit(&ds->ds_lock);
	/* add '@' if ds is a snap */
	if (len > 0)
	len++;
	len += dsl_dir_namelen(ds->ds_dir);
	return (len);
	}

	void
	dsl_dataset_rele(dsl_dataset_t ds, void tag)
	{
	dmu_buf_rele(ds->ds_dbuf, tag);
	}

	void
	dsl_dataset_remove_key_mapping(dsl_dataset_t *ds)
	{
	dsl_dir_t *dd = ds->ds_dir;

	if (dd == NULL \|\| dd->dd_crypto_obj == 0)
	return;

	(void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa,
	ds->ds_object, ds);
	}

	void
	dsl_dataset_rele_flags(dsl_dataset_t ds, ds_hold_flags_t flags, void tag)
	{
	if (flags & DS_HOLD_FLAG_DECRYPT)
	dsl_dataset_remove_key_mapping(ds);

	dsl_dataset_rele(ds, tag);
	}

	void
	dsl_dataset_disown(dsl_dataset_t ds, ds_hold_flags_t flags, void tag)
	{
	ASSERT3P(ds->ds_owner, ==, tag);
	ASSERT(ds->ds_dbuf != NULL);

	mutex_enter(&ds->ds_lock);
	ds->ds_owner = NULL;
	mutex_exit(&ds->ds_lock);
	dsl_dataset_long_rele(ds, tag);
	dsl_dataset_rele_flags(ds, flags, tag);
	}

	boolean_t
	dsl_dataset_tryown(dsl_dataset_t ds, void tag, boolean_t override)
	{
	boolean_t gotit = FALSE;

	ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
	mutex_enter(&ds->ds_lock);
	if (ds->ds_owner == NULL && (override \|\| !(DS_IS_INCONSISTENT(ds) \|\|
	(dsl_dataset_feature_is_active(ds,
	SPA_FEATURE_REDACTED_DATASETS) &&
	!zfs_allow_redacted_dataset_mount)))) {
	ds->ds_owner = tag;
	dsl_dataset_long_hold(ds, tag);
	gotit = TRUE;
	}
	mutex_exit(&ds->ds_lock);
	return (gotit);
	}

	boolean_t
	dsl_dataset_has_owner(dsl_dataset_t *ds)
	{
	boolean_t rv;
	mutex_enter(&ds->ds_lock);
	rv = (ds->ds_owner != NULL);
	mutex_exit(&ds->ds_lock);
	return (rv);
	}

	static boolean_t
	zfeature_active(spa_feature_t f, void *arg)
	{
	switch (spa_feature_table[f].fi_type) {
	case ZFEATURE_TYPE_BOOLEAN: {
	boolean_t val = (boolean_t)(uintptr_t)arg;
	ASSERT(val == B_FALSE \|\| val == B_TRUE);
	return (val);
	}
	case ZFEATURE_TYPE_UINT64_ARRAY:
	/*
	* In this case, arg is a uint64_t array. The feature is active
	* if the array is non-null.
	*/
	return (arg != NULL);
	default:
	panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
	return (B_FALSE);
	}
	}

	boolean_t
	dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f)
	{
	return (zfeature_active(f, ds->ds_feature[f]));
	}

	/*
	* The buffers passed out by this function are references to internal buffers;
	* they should not be freed by callers of this function, and they should not be
	* used after the dataset has been released.
	*/
	boolean_t
	dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f,
	uint64_t outlength, uint64_t *outp)
	{
	VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY);
	if (!dsl_dataset_feature_is_active(ds, f)) {
	return (B_FALSE);
	}
	struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f];
	*outp = ftuaa->array;
	*outlength = ftuaa->length;
	return (B_TRUE);
	}

	void
	dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg,
	dmu_tx_t *tx)
	{
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
	uint64_t zero = 0;

	VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);

	spa_feature_incr(spa, f, tx);
	dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);

	switch (spa_feature_table[f].fi_type) {
	case ZFEATURE_TYPE_BOOLEAN:
	ASSERT3S((boolean_t)(uintptr_t)arg, ==, B_TRUE);
	VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
	sizeof (zero), 1, &zero, tx));
	break;
	case ZFEATURE_TYPE_UINT64_ARRAY:
	{
	struct feature_type_uint64_array_arg *ftuaa = arg;
	VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
	sizeof (uint64_t), ftuaa->length, ftuaa->array, tx));
	break;
	}
	default:
	panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
	}
	}

	static void
	dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f,
	dmu_tx_t *tx)
	{
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
	uint64_t dsobj = ds->ds_object;

	VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);

	VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
	spa_feature_decr(spa, f, tx);
	ds->ds_feature[f] = NULL;
	}

	void
	dsl_dataset_deactivate_feature(dsl_dataset_t ds, spa_feature_t f, dmu_tx_t tx)
	{
	unload_zfeature(ds, f);
	dsl_dataset_deactivate_feature_impl(ds, f, tx);
	}

	uint64_t
	dsl_dataset_create_sync_dd(dsl_dir_t dd, dsl_dataset_t origin,
	dsl_crypto_params_t dcp, uint64_t flags, dmu_tx_t tx)
	{
	dsl_pool_t *dp = dd->dd_pool;
	dmu_buf_t *dbuf;
	dsl_dataset_phys_t *dsphys;
	uint64_t dsobj;
	objset_t *mos = dp->dp_meta_objset;

	if (origin == NULL)
	origin = dp->dp_origin_snap;

	ASSERT(origin == NULL \|\| origin->ds_dir->dd_pool == dp);
	ASSERT(origin == NULL \|\| dsl_dataset_phys(origin)->ds_num_children > 0);
	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);

	dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
	DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
	VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
	dmu_buf_will_dirty(dbuf, tx);
	dsphys = dbuf->db_data;
	bzero(dsphys, sizeof (dsl_dataset_phys_t));
	dsphys->ds_dir_obj = dd->dd_object;
	dsphys->ds_flags = flags;
	dsphys->ds_fsid_guid = unique_create();
	(void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
	sizeof (dsphys->ds_guid));
	dsphys->ds_snapnames_zapobj =
	zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
	DMU_OT_NONE, 0, tx);
	dsphys->ds_creation_time = gethrestime_sec();
	dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;

	if (origin == NULL) {
	dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
	} else {
	dsl_dataset_t ohds; / head of the origin snapshot */

	dsphys->ds_prev_snap_obj = origin->ds_object;
	dsphys->ds_prev_snap_txg =
	dsl_dataset_phys(origin)->ds_creation_txg;
	dsphys->ds_referenced_bytes =
	dsl_dataset_phys(origin)->ds_referenced_bytes;
	dsphys->ds_compressed_bytes =
	dsl_dataset_phys(origin)->ds_compressed_bytes;
	dsphys->ds_uncompressed_bytes =
	dsl_dataset_phys(origin)->ds_uncompressed_bytes;
	rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG);
	dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
	rrw_exit(&origin->ds_bp_rwlock, FTAG);

	/*
	* Inherit flags that describe the dataset's contents
	* (INCONSISTENT) or properties (Case Insensitive).
	*/
	dsphys->ds_flags \|= dsl_dataset_phys(origin)->ds_flags &
	(DS_FLAG_INCONSISTENT \| DS_FLAG_CI_DATASET);

	for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
	if (zfeature_active(f, origin->ds_feature[f])) {
	dsl_dataset_activate_feature(dsobj, f,
	origin->ds_feature[f], tx);
	}
	}

	dmu_buf_will_dirty(origin->ds_dbuf, tx);
	dsl_dataset_phys(origin)->ds_num_children++;

	VERIFY0(dsl_dataset_hold_obj(dp,
	dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
	FTAG, &ohds));
	dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
	dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
	dsl_dataset_rele(ohds, FTAG);

	if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
	if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
	dsl_dataset_phys(origin)->ds_next_clones_obj =
	zap_create(mos,
	DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
	}
	VERIFY0(zap_add_int(mos,
	dsl_dataset_phys(origin)->ds_next_clones_obj,
	dsobj, tx));
	}

	dmu_buf_will_dirty(dd->dd_dbuf, tx);
	dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
	if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
	if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
	dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
	dsl_dir_phys(origin->ds_dir)->dd_clones =
	zap_create(mos,
	DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
	}
	VERIFY0(zap_add_int(mos,
	dsl_dir_phys(origin->ds_dir)->dd_clones,
	dsobj, tx));
	}
	}

	/* handle encryption */
	dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx);

	if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
	dsphys->ds_flags \|= DS_FLAG_UNIQUE_ACCURATE;

	dmu_buf_rele(dbuf, FTAG);

	dmu_buf_will_dirty(dd->dd_dbuf, tx);
	dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;

	return (dsobj);
	}

	static void
	dsl_dataset_zero_zil(dsl_dataset_t ds, dmu_tx_t tx)
	{
	objset_t *os;

	VERIFY0(dmu_objset_from_ds(ds, &os));
	if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) {
	dsl_pool_t *dp = ds->ds_dir->dd_pool;
	zio_t *zio;

	bzero(&os->os_zil_header, sizeof (os->os_zil_header));
	if (os->os_encrypted)
	os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;

	zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
	dsl_dataset_sync(ds, zio, tx);
	VERIFY0(zio_wait(zio));

	/* dsl_dataset_sync_done will drop this reference. */
	dmu_buf_add_ref(ds->ds_dbuf, ds);
	dsl_dataset_sync_done(ds, tx);
	}
	}

	uint64_t
	dsl_dataset_create_sync(dsl_dir_t pdd, const char lastname,
	dsl_dataset_t origin, uint64_t flags, cred_t cr,
	dsl_crypto_params_t dcp, dmu_tx_t tx)
	{
	dsl_pool_t *dp = pdd->dd_pool;
	uint64_t dsobj, ddobj;
	dsl_dir_t *dd;

	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(lastname[0] != '@');
	/*
	* Filesystems will eventually have their origin set to dp_origin_snap,
	* but that's taken care of in dsl_dataset_create_sync_dd. When
	* creating a filesystem, this function is called with origin equal to
	* NULL.
	*/
	if (origin != NULL)
	ASSERT3P(origin, !=, dp->dp_origin_snap);

	ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
	VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));

	dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp,
	flags & ~DS_CREATE_FLAG_NODIRTY, tx);

	dsl_deleg_set_create_perms(dd, tx, cr);

	/*
	* If we are creating a clone and the livelist feature is enabled,
	* add the entry DD_FIELD_LIVELIST to ZAP.
	*/
	if (origin != NULL &&
	spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) {
	objset_t *mos = dd->dd_pool->dp_meta_objset;
	dsl_dir_zapify(dd, tx);
	uint64_t obj = dsl_deadlist_alloc(mos, tx);
	VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST,
	sizeof (uint64_t), 1, &obj, tx));
	spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx);
	}

	/*
	* Since we're creating a new node we know it's a leaf, so we can
	* initialize the counts if the limit feature is active.
	*/
	if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
	uint64_t cnt = 0;
	objset_t *os = dd->dd_pool->dp_meta_objset;

	dsl_dir_zapify(dd, tx);
	VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
	sizeof (cnt), 1, &cnt, tx));
	VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
	sizeof (cnt), 1, &cnt, tx));
	}

	dsl_dir_rele(dd, FTAG);

	/*
	* If we are creating a clone, make sure we zero out any stale
	* data from the origin snapshots zil header.
	*/
	if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
	dsl_dataset_t *ds;

	VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
	dsl_dataset_zero_zil(ds, tx);
	dsl_dataset_rele(ds, FTAG);
	}

	return (dsobj);
	}

	/*
	* The unique space in the head dataset can be calculated by subtracting
	* the space used in the most recent snapshot, that is still being used
	* in this file system, from the space currently in use. To figure out
	* the space in the most recent snapshot still in use, we need to take
	* the total space used in the snapshot and subtract out the space that
	* has been freed up since the snapshot was taken.
	*/
	void
	dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
	{
	uint64_t mrs_used;
	uint64_t dlused, dlcomp, dluncomp;

	ASSERT(!ds->ds_is_snapshot);

	if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
	mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
	else
	mrs_used = 0;

	dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);

	ASSERT3U(dlused, <=, mrs_used);
	dsl_dataset_phys(ds)->ds_unique_bytes =
	dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);

	if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
	SPA_VERSION_UNIQUE_ACCURATE)
	dsl_dataset_phys(ds)->ds_flags \|= DS_FLAG_UNIQUE_ACCURATE;
	}

	void
	dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
	dmu_tx_t *tx)
	{
	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
	uint64_t count __maybe_unused;
	int err;

	ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
	err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
	obj, tx);
	/*
	* The err should not be ENOENT, but a bug in a previous version
	* of the code could cause upgrade_clones_cb() to not set
	* ds_next_snap_obj when it should, leading to a missing entry.
	* If we knew that the pool was created after
	* SPA_VERSION_NEXT_CLONES, we could assert that it isn't
	* ENOENT. However, at least we can check that we don't have
	* too many entries in the next_clones_obj even after failing to
	* remove this one.
	*/
	if (err != ENOENT)
	VERIFY0(err);
	ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
	&count));
	ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
	}


	blkptr_t *
	dsl_dataset_get_blkptr(dsl_dataset_t *ds)
	{
	return (&dsl_dataset_phys(ds)->ds_bp);
	}

	spa_t *
	dsl_dataset_get_spa(dsl_dataset_t *ds)
	{
	return (ds->ds_dir->dd_pool->dp_spa);
	}

	void
	dsl_dataset_dirty(dsl_dataset_t ds, dmu_tx_t tx)
	{
	dsl_pool_t *dp;

	if (ds == NULL) /* this is the meta-objset */
	return;

	ASSERT(ds->ds_objset != NULL);

	if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
	panic("dirtying snapshot!");

	/* Must not dirty a dataset in the same txg where it got snapshotted. */
	ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);

	dp = ds->ds_dir->dd_pool;
	if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
	objset_t *os = ds->ds_objset;

	/* up the hold count until we can be written out */
	dmu_buf_add_ref(ds->ds_dbuf, ds);

	/* if this dataset is encrypted, grab a reference to the DCK */
	if (ds->ds_dir->dd_crypto_obj != 0 &&
	!os->os_raw_receive &&
	!os->os_next_write_raw[tx->tx_txg & TXG_MASK]) {
	ASSERT3P(ds->ds_key_mapping, !=, NULL);
	key_mapping_add_ref(ds->ds_key_mapping, ds);
	}
	}
	}

	static int
	dsl_dataset_snapshot_reserve_space(dsl_dataset_t ds, dmu_tx_t tx)
	{
	uint64_t asize;

	if (!dmu_tx_is_syncing(tx))
	return (0);

	/*
	* If there's an fs-only reservation, any blocks that might become
	* owned by the snapshot dataset must be accommodated by space
	* outside of the reservation.
	*/
	ASSERT(ds->ds_reserved == 0 \|\| DS_UNIQUE_IS_ACCURATE(ds));
	asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
	if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
	return (SET_ERROR(ENOSPC));

	/*
	* Propagate any reserved space for this snapshot to other
	* snapshot checks in this sync group.
	*/
	if (asize > 0)
	dsl_dir_willuse_space(ds->ds_dir, asize, tx);

	return (0);
	}

	int
	dsl_dataset_snapshot_check_impl(dsl_dataset_t ds, const char snapname,
	dmu_tx_t tx, boolean_t recv, uint64_t cnt, cred_t cr, proc_t *proc)
	{
	int error;
	uint64_t value;

	ds->ds_trysnap_txg = tx->tx_txg;

	if (!dmu_tx_is_syncing(tx))
	return (0);

	/*
	* We don't allow multiple snapshots of the same txg. If there
	* is already one, try again.
	*/
	if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
	return (SET_ERROR(EAGAIN));

	/*
	* Check for conflicting snapshot name.
	*/
	error = dsl_dataset_snap_lookup(ds, snapname, &value);
	if (error == 0)
	return (SET_ERROR(EEXIST));
	if (error != ENOENT)
	return (error);

	/*
	* We don't allow taking snapshots of inconsistent datasets, such as
	* those into which we are currently receiving. However, if we are
	* creating this snapshot as part of a receive, this check will be
	* executed atomically with respect to the completion of the receive
	* itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
	* case we ignore this, knowing it will be fixed up for us shortly in
	* dmu_recv_end_sync().
	*/
	if (!recv && DS_IS_INCONSISTENT(ds))
	return (SET_ERROR(EBUSY));

	/*
	* Skip the check for temporary snapshots or if we have already checked
	* the counts in dsl_dataset_snapshot_check. This means we really only
	* check the count here when we're receiving a stream.
	*/
	if (cnt != 0 && cr != NULL) {
	error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
	ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc);
	if (error != 0)
	return (error);
	}

	error = dsl_dataset_snapshot_reserve_space(ds, tx);
	if (error != 0)
	return (error);

	return (0);
	}

	int
	dsl_dataset_snapshot_check(void arg, dmu_tx_t tx)
	{
	dsl_dataset_snapshot_arg_t *ddsa = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	nvpair_t *pair;
	int rv = 0;

	/*
	* Pre-compute how many total new snapshots will be created for each
	* level in the tree and below. This is needed for validating the
	* snapshot limit when either taking a recursive snapshot or when
	* taking multiple snapshots.
	*
	* The problem is that the counts are not actually adjusted when
	* we are checking, only when we finally sync. For a single snapshot,
	* this is easy, the count will increase by 1 at each node up the tree,
	* but its more complicated for the recursive/multiple snapshot case.
	*
	* The dsl_fs_ss_limit_check function does recursively check the count
	* at each level up the tree but since it is validating each snapshot
	* independently we need to be sure that we are validating the complete
	* count for the entire set of snapshots. We do this by rolling up the
	* counts for each component of the name into an nvlist and then
	* checking each of those cases with the aggregated count.
	*
	* This approach properly handles not only the recursive snapshot
	* case (where we get all of those on the ddsa_snaps list) but also
	* the sibling case (e.g. snapshot a/b and a/c so that we will also
	* validate the limit on 'a' using a count of 2).
	*
	* We validate the snapshot names in the third loop and only report
	* name errors once.
	*/
	if (dmu_tx_is_syncing(tx)) {
	char *nm;
	nvlist_t *cnt_track = NULL;
	cnt_track = fnvlist_alloc();

	nm = kmem_alloc(MAXPATHLEN, KM_SLEEP);

	/* Rollup aggregated counts into the cnt_track list */
	for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
	pair != NULL;
	pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
	char *pdelim;
	uint64_t val;

	(void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN);
	pdelim = strchr(nm, '@');
	if (pdelim == NULL)
	continue;
	*pdelim = '\0';

	do {
	if (nvlist_lookup_uint64(cnt_track, nm,
	&val) == 0) {
	/* update existing entry */
	fnvlist_add_uint64(cnt_track, nm,
	val + 1);
	} else {
	/* add to list */
	fnvlist_add_uint64(cnt_track, nm, 1);
	}

	pdelim = strrchr(nm, '/');
	if (pdelim != NULL)
	*pdelim = '\0';
	} while (pdelim != NULL);
	}

	kmem_free(nm, MAXPATHLEN);

	/* Check aggregated counts at each level */
	for (pair = nvlist_next_nvpair(cnt_track, NULL);
	pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
	int error = 0;
	char *name;
	uint64_t cnt = 0;
	dsl_dataset_t *ds;

	name = nvpair_name(pair);
	cnt = fnvpair_value_uint64(pair);
	ASSERT(cnt > 0);

	error = dsl_dataset_hold(dp, name, FTAG, &ds);
	if (error == 0) {
	error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
	ZFS_PROP_SNAPSHOT_LIMIT, NULL,
	ddsa->ddsa_cr, ddsa->ddsa_proc);
	dsl_dataset_rele(ds, FTAG);
	}

	if (error != 0) {
	if (ddsa->ddsa_errors != NULL)
	fnvlist_add_int32(ddsa->ddsa_errors,
	name, error);
	rv = error;
	/* only report one error for this check */
	break;
	}
	}
	nvlist_free(cnt_track);
	}

	for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
	pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
	int error = 0;
	dsl_dataset_t *ds;
	char name, atp = NULL;
	char dsname[ZFS_MAX_DATASET_NAME_LEN];

	name = nvpair_name(pair);
	if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN)
	error = SET_ERROR(ENAMETOOLONG);
	if (error == 0) {
	atp = strchr(name, '@');
	if (atp == NULL)
	error = SET_ERROR(EINVAL);
	if (error == 0)
	(void) strlcpy(dsname, name, atp - name + 1);
	}
	if (error == 0)
	error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
	if (error == 0) {
	/* passing 0/NULL skips dsl_fs_ss_limit_check */
	error = dsl_dataset_snapshot_check_impl(ds,
	atp + 1, tx, B_FALSE, 0, NULL, NULL);
	dsl_dataset_rele(ds, FTAG);
	}

	if (error != 0) {
	if (ddsa->ddsa_errors != NULL) {
	fnvlist_add_int32(ddsa->ddsa_errors,
	name, error);
	}
	rv = error;
	}
	}

	return (rv);
	}

	void
	dsl_dataset_snapshot_sync_impl(dsl_dataset_t ds, const char snapname,
	dmu_tx_t *tx)
	{
	dsl_pool_t *dp = ds->ds_dir->dd_pool;
	dmu_buf_t *dbuf;
	dsl_dataset_phys_t *dsphys;
	uint64_t dsobj, crtxg;
	objset_t *mos = dp->dp_meta_objset;
	static zil_header_t zero_zil __maybe_unused;
	objset_t *os __maybe_unused;

	ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));

	/*
	* If we are on an old pool, the zil must not be active, in which
	* case it will be zeroed. Usually zil_suspend() accomplishes this.
	*/
	ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP \|\|
	dmu_objset_from_ds(ds, &os) != 0 \|\|
	bcmp(&os->os_phys->os_zil_header, &zero_zil,
	sizeof (zero_zil)) == 0);

	/* Should not snapshot a dirty dataset. */
	ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
	ds, tx->tx_txg));

	dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);

	/*
	* The origin's ds_creation_txg has to be < TXG_INITIAL
	*/
	if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
	crtxg = 1;
	else
	crtxg = tx->tx_txg;

	dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
	DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
	VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
	dmu_buf_will_dirty(dbuf, tx);
	dsphys = dbuf->db_data;
	bzero(dsphys, sizeof (dsl_dataset_phys_t));
	dsphys->ds_dir_obj = ds->ds_dir->dd_object;
	dsphys->ds_fsid_guid = unique_create();
	(void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
	sizeof (dsphys->ds_guid));
	dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
	dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
	dsphys->ds_next_snap_obj = ds->ds_object;
	dsphys->ds_num_children = 1;
	dsphys->ds_creation_time = gethrestime_sec();
	dsphys->ds_creation_txg = crtxg;
	dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
	dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
	dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
	dsphys->ds_uncompressed_bytes =
	dsl_dataset_phys(ds)->ds_uncompressed_bytes;
	dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
	rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
	dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
	rrw_exit(&ds->ds_bp_rwlock, FTAG);
	dmu_buf_rele(dbuf, FTAG);

	for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
	if (zfeature_active(f, ds->ds_feature[f])) {
	dsl_dataset_activate_feature(dsobj, f,
	ds->ds_feature[f], tx);
	}
	}

	ASSERT3U(ds->ds_prev != 0, ==,
	dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
	if (ds->ds_prev) {
	uint64_t next_clones_obj =
	dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
	ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
	ds->ds_object \|\|
	dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
	if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
	ds->ds_object) {
	dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
	ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
	dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
	dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
	} else if (next_clones_obj != 0) {
	dsl_dataset_remove_from_next_clones(ds->ds_prev,
	dsphys->ds_next_snap_obj, tx);
	VERIFY0(zap_add_int(mos,
	next_clones_obj, dsobj, tx));
	}
	}

	/*
	* If we have a reference-reservation on this dataset, we will
	* need to increase the amount of refreservation being charged
	* since our unique space is going to zero.
	*/
	if (ds->ds_reserved) {
	int64_t delta;
	ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
	delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
	ds->ds_reserved);
	dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
	delta, 0, 0, tx);
	}

	dmu_buf_will_dirty(ds->ds_dbuf, tx);
	dsl_dataset_phys(ds)->ds_deadlist_obj =
	dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
	dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
	dsl_deadlist_close(&ds->ds_deadlist);
	dsl_deadlist_open(&ds->ds_deadlist, mos,
	dsl_dataset_phys(ds)->ds_deadlist_obj);
	dsl_deadlist_add_key(&ds->ds_deadlist,
	dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
	dsl_bookmark_snapshotted(ds, tx);

	if (dsl_dataset_remap_deadlist_exists(ds)) {
	uint64_t remap_deadlist_obj =
	dsl_dataset_get_remap_deadlist_object(ds);
	/*
	* Move the remap_deadlist to the snapshot. The head
	* will create a new remap deadlist on demand, from
	* dsl_dataset_block_remapped().
	*/
	dsl_dataset_unset_remap_deadlist_object(ds, tx);
	dsl_deadlist_close(&ds->ds_remap_deadlist);

	dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
	VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST,
	sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx));
	}

	/*
	* Create a ivset guid for this snapshot if the dataset is
	* encrypted. This may be overridden by a raw receive. A
	* previous implementation of this code did not have this
	* field as part of the on-disk format for ZFS encryption
	* (see errata #4). As part of the remediation for this
	* issue, we ask the user to enable the bookmark_v2 feature
	* which is now a dependency of the encryption feature. We
	* use this as a heuristic to determine when the user has
	* elected to correct any datasets created with the old code.
	* As a result, we only do this step if the bookmark_v2
	* feature is enabled, which limits the number of states a
	* given pool / dataset can be in with regards to terms of
	* correcting the issue.
	*/
	if (ds->ds_dir->dd_crypto_obj != 0 &&
	spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) {
	uint64_t ivset_guid = unique_create();

	dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
	VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID,
	sizeof (ivset_guid), 1, &ivset_guid, tx));
	}

	ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
	dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
	dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
	dsl_dataset_phys(ds)->ds_unique_bytes = 0;

	if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
	dsl_dataset_phys(ds)->ds_flags \|= DS_FLAG_UNIQUE_ACCURATE;

	VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
	snapname, 8, 1, &dsobj, tx));

	if (ds->ds_prev)
	dsl_dataset_rele(ds->ds_prev, ds);
	VERIFY0(dsl_dataset_hold_obj(dp,
	dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));

	dsl_scan_ds_snapshotted(ds, tx);

	dsl_dir_snap_cmtime_update(ds->ds_dir);

	spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " ");
	}

	void
	dsl_dataset_snapshot_sync(void arg, dmu_tx_t tx)
	{
	dsl_dataset_snapshot_arg_t *ddsa = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	nvpair_t *pair;

	for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
	pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
	dsl_dataset_t *ds;
	char name, atp;
	char dsname[ZFS_MAX_DATASET_NAME_LEN];

	name = nvpair_name(pair);
	atp = strchr(name, '@');
	(void) strlcpy(dsname, name, atp - name + 1);
	VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));

	dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
	if (ddsa->ddsa_props != NULL) {
	dsl_props_set_sync_impl(ds->ds_prev,
	ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
	}
	dsl_dataset_rele(ds, FTAG);
	}
	}

	/*
	* The snapshots must all be in the same pool.
	* All-or-nothing: if there are any failures, nothing will be modified.
	*/
	int
	dsl_dataset_snapshot(nvlist_t snaps, nvlist_t props, nvlist_t *errors)
	{
	dsl_dataset_snapshot_arg_t ddsa;
	nvpair_t *pair;
	boolean_t needsuspend;
	int error;
	spa_t *spa;
	char *firstname;
	nvlist_t *suspended = NULL;

	pair = nvlist_next_nvpair(snaps, NULL);
	if (pair == NULL)
	return (0);
	firstname = nvpair_name(pair);

	error = spa_open(firstname, &spa, FTAG);
	if (error != 0)
	return (error);
	needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
	spa_close(spa, FTAG);

	if (needsuspend) {
	suspended = fnvlist_alloc();
	for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
	pair = nvlist_next_nvpair(snaps, pair)) {
	char fsname[ZFS_MAX_DATASET_NAME_LEN];
	char *snapname = nvpair_name(pair);
	char *atp;
	void *cookie;

	atp = strchr(snapname, '@');
	if (atp == NULL) {
	error = SET_ERROR(EINVAL);
	break;
	}
	(void) strlcpy(fsname, snapname, atp - snapname + 1);

	error = zil_suspend(fsname, &cookie);
	if (error != 0)
	break;
	fnvlist_add_uint64(suspended, fsname,
	(uintptr_t)cookie);
	}
	}

	ddsa.ddsa_snaps = snaps;
	ddsa.ddsa_props = props;
	ddsa.ddsa_errors = errors;
	ddsa.ddsa_cr = CRED();
	ddsa.ddsa_proc = curproc;

	if (error == 0) {
	error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
	dsl_dataset_snapshot_sync, &ddsa,
	fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
	}

	if (suspended != NULL) {
	for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
	pair = nvlist_next_nvpair(suspended, pair)) {
	zil_resume((void *)(uintptr_t)
	fnvpair_value_uint64(pair));
	}
	fnvlist_free(suspended);
	}

	if (error == 0) {
	for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
	pair = nvlist_next_nvpair(snaps, pair)) {
	zvol_create_minor(nvpair_name(pair));
	}
	}

	return (error);
	}

	typedef struct dsl_dataset_snapshot_tmp_arg {
	const char *ddsta_fsname;
	const char *ddsta_snapname;
	minor_t ddsta_cleanup_minor;
	const char *ddsta_htag;
	} dsl_dataset_snapshot_tmp_arg_t;

	static int
	dsl_dataset_snapshot_tmp_check(void arg, dmu_tx_t tx)
	{
	dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	int error;

	error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
	if (error != 0)
	return (error);

	/* NULL cred means no limit check for tmp snapshot */
	error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
	tx, B_FALSE, 0, NULL, NULL);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(ENOTSUP));
	}
	error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
	B_TRUE, tx);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	static void
	dsl_dataset_snapshot_tmp_sync(void arg, dmu_tx_t tx)
	{
	dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds = NULL;

	VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));

	dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
	dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
	ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
	dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);

	dsl_dataset_rele(ds, FTAG);
	}

	int
	dsl_dataset_snapshot_tmp(const char fsname, const char snapname,
	minor_t cleanup_minor, const char *htag)
	{
	dsl_dataset_snapshot_tmp_arg_t ddsta;
	int error;
	spa_t *spa;
	boolean_t needsuspend;
	void *cookie;

	ddsta.ddsta_fsname = fsname;
	ddsta.ddsta_snapname = snapname;
	ddsta.ddsta_cleanup_minor = cleanup_minor;
	ddsta.ddsta_htag = htag;

	error = spa_open(fsname, &spa, FTAG);
	if (error != 0)
	return (error);
	needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
	spa_close(spa, FTAG);

	if (needsuspend) {
	error = zil_suspend(fsname, &cookie);
	if (error != 0)
	return (error);
	}

	error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
	dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);

	if (needsuspend)
	zil_resume(cookie);
	return (error);
	}

	void
	dsl_dataset_sync(dsl_dataset_t ds, zio_t zio, dmu_tx_t *tx)
	{
	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(ds->ds_objset != NULL);
	ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);

	/*
	* in case we had to change ds_fsid_guid when we opened it,
	* sync it out now.
	*/
	dmu_buf_will_dirty(ds->ds_dbuf, tx);
	dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;

	if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
	VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
	ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
	&ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
	VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
	ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
	&ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
	VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
	ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
	&ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
	ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
	ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
	ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
	}

	dmu_objset_sync(ds->ds_objset, zio, tx);

	for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
	if (zfeature_active(f, ds->ds_feature_activation[f])) {
	if (zfeature_active(f, ds->ds_feature[f]))
	continue;
	dsl_dataset_activate_feature(ds->ds_object, f,
	ds->ds_feature_activation[f], tx);
	ds->ds_feature[f] = ds->ds_feature_activation[f];
	}
	}
	}

	/*
	* Check if the percentage of blocks shared between the clone and the
	* snapshot (as opposed to those that are clone only) is below a certain
	* threshold
	*/
	static boolean_t
	dsl_livelist_should_disable(dsl_dataset_t *ds)
	{
	uint64_t used, referenced;
	int percent_shared;

	used = dsl_dir_get_usedds(ds->ds_dir);
	referenced = dsl_get_referenced(ds);
	ASSERT3U(referenced, >=, 0);
	ASSERT3U(used, >=, 0);
	if (referenced == 0)
	return (B_FALSE);
	percent_shared = (100 * (referenced - used)) / referenced;
	if (percent_shared <= zfs_livelist_min_percent_shared)
	return (B_TRUE);
	return (B_FALSE);
	}

	/*
	* Check if it is possible to combine two livelist entries into one.
	* This is the case if the combined number of 'live' blkptrs (ALLOCs that
	* don't have a matching FREE) is under the maximum sublist size.
	* We check this by subtracting twice the total number of frees from the total
	* number of blkptrs. FREEs are counted twice because each FREE blkptr
	* will cancel out an ALLOC blkptr when the livelist is processed.
	*/
	static boolean_t
	dsl_livelist_should_condense(dsl_deadlist_entry_t *first,
	dsl_deadlist_entry_t *next)
	{
	uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed +
	next->dle_bpobj.bpo_phys->bpo_num_freed;
	uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs +
	next->dle_bpobj.bpo_phys->bpo_num_blkptrs;
	if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries)
	return (B_TRUE);
	return (B_FALSE);
	}

	typedef struct try_condense_arg {
	spa_t *spa;
	dsl_dataset_t *ds;
	} try_condense_arg_t;

	/*
	* Iterate over the livelist entries, searching for a pair to condense.
	* A nonzero return value means stop, 0 means keep looking.
	*/
	static int
	dsl_livelist_try_condense(void arg, dsl_deadlist_entry_t first)
	{
	try_condense_arg_t *tca = arg;
	spa_t *spa = tca->spa;
	dsl_dataset_t *ds = tca->ds;
	dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist;
	dsl_deadlist_entry_t *next;

	/* The condense thread has not yet been created at import */
	if (spa->spa_livelist_condense_zthr == NULL)
	return (1);

	/* A condense is already in progress */
	if (spa->spa_to_condense.ds != NULL)
	return (1);

	next = AVL_NEXT(&ll->dl_tree, &first->dle_node);
	/* The livelist has only one entry - don't condense it */
	if (next == NULL)
	return (1);

	/* Next is the newest entry - don't condense it */
	if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL)
	return (1);

	/* This pair is not ready to condense but keep looking */
	if (!dsl_livelist_should_condense(first, next))
	return (0);

	/*
	* Add a ref to prevent the dataset from being evicted while
	* the condense zthr or synctask are running. Ref will be
	* released at the end of the condense synctask
	*/
	dmu_buf_add_ref(ds->ds_dbuf, spa);

	spa->spa_to_condense.ds = ds;
	spa->spa_to_condense.first = first;
	spa->spa_to_condense.next = next;
	spa->spa_to_condense.syncing = B_FALSE;
	spa->spa_to_condense.cancelled = B_FALSE;

	zthr_wakeup(spa->spa_livelist_condense_zthr);
	return (1);
	}

	static void
	dsl_flush_pending_livelist(dsl_dataset_t ds, dmu_tx_t tx)
	{
	dsl_dir_t *dd = ds->ds_dir;
	spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
	dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist);

	/* Check if we need to add a new sub-livelist */
	if (last == NULL) {
	/* The livelist is empty */
	dsl_deadlist_add_key(&dd->dd_livelist,
	tx->tx_txg - 1, tx);
	} else if (spa_sync_pass(spa) == 1) {
	/*
	* Check if the newest entry is full. If it is, make a new one.
	* We only do this once per sync because we could overfill a
	* sublist in one sync pass and don't want to add another entry
	* for a txg that is already represented. This ensures that
	* blkptrs born in the same txg are stored in the same sublist.
	*/
	bpobj_t bpobj = last->dle_bpobj;
	uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs;
	uint64_t free = bpobj.bpo_phys->bpo_num_freed;
	uint64_t alloc = all - free;
	if (alloc > zfs_livelist_max_entries) {
	dsl_deadlist_add_key(&dd->dd_livelist,
	tx->tx_txg - 1, tx);
	}
	}

	/* Insert each entry into the on-disk livelist */
	bplist_iterate(&dd->dd_pending_allocs,
	dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx);
	bplist_iterate(&dd->dd_pending_frees,
	dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx);

	/* Attempt to condense every pair of adjacent entries */
	try_condense_arg_t arg = {
	.spa = spa,
	.ds = ds
	};
	dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense,
	&arg);
	}

	void
	dsl_dataset_sync_done(dsl_dataset_t ds, dmu_tx_t tx)
	{
	objset_t *os = ds->ds_objset;

	bplist_iterate(&ds->ds_pending_deadlist,
	dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx);

	if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) {
	dsl_flush_pending_livelist(ds, tx);
	if (dsl_livelist_should_disable(ds)) {
	dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE);
	}
	}

	dsl_bookmark_sync_done(ds, tx);

	multilist_destroy(&os->os_synced_dnodes);

	if (os->os_encrypted)
	os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE;
	else
	ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]);

	ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx)));

	dmu_buf_rele(ds->ds_dbuf, ds);
	}

	int
	get_clones_stat_impl(dsl_dataset_t ds, nvlist_t val)
	{
	uint64_t count = 0;
	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
	zap_cursor_t zc;
	zap_attribute_t za;

	ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));

	/*
	* There may be missing entries in ds_next_clones_obj
	* due to a bug in a previous version of the code.
	* Only trust it if it has the right number of entries.
	*/
	if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
	VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
	&count));
	}
	if (count != dsl_dataset_phys(ds)->ds_num_children - 1) {
	return (SET_ERROR(ENOENT));
	}
	for (zap_cursor_init(&zc, mos,
	dsl_dataset_phys(ds)->ds_next_clones_obj);
	zap_cursor_retrieve(&zc, &za) == 0;
	zap_cursor_advance(&zc)) {
	dsl_dataset_t *clone;
	char buf[ZFS_MAX_DATASET_NAME_LEN];
	VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
	za.za_first_integer, FTAG, &clone));
	dsl_dir_name(clone->ds_dir, buf);
	fnvlist_add_boolean(val, buf);
	dsl_dataset_rele(clone, FTAG);
	}
	zap_cursor_fini(&zc);
	return (0);
	}

	void
	get_clones_stat(dsl_dataset_t ds, nvlist_t nv)
	{
	nvlist_t *propval = fnvlist_alloc();
	nvlist_t *val = fnvlist_alloc();

	if (get_clones_stat_impl(ds, val) == 0) {
	fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
	fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES),
	propval);
	}

	nvlist_free(val);
	nvlist_free(propval);
	}

	/*
	* Returns a string that represents the receive resume stats token. It should
	* be freed with strfree().
	*/
	char *
	get_receive_resume_stats_impl(dsl_dataset_t *ds)
	{
	dsl_pool_t *dp = ds->ds_dir->dd_pool;

	if (dsl_dataset_has_resume_receive_state(ds)) {
	char *str;
	void *packed;
	uint8_t *compressed;
	uint64_t val;
	nvlist_t *token_nv = fnvlist_alloc();
	size_t packed_size, compressed_size;

	if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
	fnvlist_add_uint64(token_nv, "fromguid", val);
	}
	if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
	fnvlist_add_uint64(token_nv, "object", val);
	}
	if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
	fnvlist_add_uint64(token_nv, "offset", val);
	}
	if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
	fnvlist_add_uint64(token_nv, "bytes", val);
	}
	if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
	fnvlist_add_uint64(token_nv, "toguid", val);
	}
	char buf[MAXNAMELEN];
	if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
	fnvlist_add_string(token_nv, "toname", buf);
	}
	if (zap_contains(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_LARGEBLOCK) == 0) {
	fnvlist_add_boolean(token_nv, "largeblockok");
	}
	if (zap_contains(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_EMBEDOK) == 0) {
	fnvlist_add_boolean(token_nv, "embedok");
	}
	if (zap_contains(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_COMPRESSOK) == 0) {
	fnvlist_add_boolean(token_nv, "compressok");
	}
	if (zap_contains(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_RAWOK) == 0) {
	fnvlist_add_boolean(token_nv, "rawok");
	}
	if (dsl_dataset_feature_is_active(ds,
	SPA_FEATURE_REDACTED_DATASETS)) {
	uint64_t num_redact_snaps;
	uint64_t *redact_snaps;
	VERIFY(dsl_dataset_get_uint64_array_feature(ds,
	SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps,
	&redact_snaps));
	fnvlist_add_uint64_array(token_nv, "redact_snaps",
	redact_snaps, num_redact_snaps);
	}
	if (zap_contains(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) {
	uint64_t num_redact_snaps, int_size;
	uint64_t *redact_snaps;
	VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size,
	&num_redact_snaps));
	ASSERT3U(int_size, ==, sizeof (uint64_t));

	redact_snaps = kmem_alloc(int_size * num_redact_snaps,
	KM_SLEEP);
	VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object,
	DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size,
	num_redact_snaps, redact_snaps));
	fnvlist_add_uint64_array(token_nv, "book_redact_snaps",
	redact_snaps, num_redact_snaps);
	kmem_free(redact_snaps, int_size * num_redact_snaps);
	}
	packed = fnvlist_pack(token_nv, &packed_size);
	fnvlist_free(token_nv);
	compressed = kmem_alloc(packed_size, KM_SLEEP);

	compressed_size = gzip_compress(packed, compressed,
	packed_size, packed_size, 6);

	zio_cksum_t cksum;
	fletcher_4_native_varsize(compressed, compressed_size, &cksum);

	size_t alloc_size = compressed_size * 2 + 1;
	str = kmem_alloc(alloc_size, KM_SLEEP);
	for (int i = 0; i < compressed_size; i++) {
	size_t offset = i * 2;
	(void) snprintf(str + offset, alloc_size - offset,
	"%02x", compressed[i]);
	}
	str[compressed_size * 2] = '\0';
	char *propval = kmem_asprintf("%u-%llx-%llx-%s",
	ZFS_SEND_RESUME_TOKEN_VERSION,
	(longlong_t)cksum.zc_word[0],
	(longlong_t)packed_size, str);
	kmem_free(packed, packed_size);
	kmem_free(str, alloc_size);
	kmem_free(compressed, packed_size);
	return (propval);
	}
	return (kmem_strdup(""));
	}

	/*
	* Returns a string that represents the receive resume stats token of the
	* dataset's child. It should be freed with strfree().
	*/
	char *
	get_child_receive_stats(dsl_dataset_t *ds)
	{
	char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
	dsl_dataset_t *recv_ds;
	dsl_dataset_name(ds, recvname);
	if (strlcat(recvname, "/", sizeof (recvname)) <
	sizeof (recvname) &&
	strlcat(recvname, recv_clone_name, sizeof (recvname)) <
	sizeof (recvname) &&
	dsl_dataset_hold(ds->ds_dir->dd_pool, recvname, FTAG,
	&recv_ds) == 0) {
	char *propval = get_receive_resume_stats_impl(recv_ds);
	dsl_dataset_rele(recv_ds, FTAG);
	return (propval);
	}
	return (kmem_strdup(""));
	}

	static void
	get_receive_resume_stats(dsl_dataset_t ds, nvlist_t nv)
	{
	char *propval = get_receive_resume_stats_impl(ds);
	if (strcmp(propval, "") != 0) {
	dsl_prop_nvlist_add_string(nv,
	ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
	} else {
	char *childval = get_child_receive_stats(ds);
	if (strcmp(childval, "") != 0) {
	dsl_prop_nvlist_add_string(nv,
	ZFS_PROP_RECEIVE_RESUME_TOKEN, childval);
	}
	kmem_strfree(childval);
	}
	kmem_strfree(propval);
	}

	uint64_t
	dsl_get_refratio(dsl_dataset_t *ds)
	{
	uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
	(dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
	dsl_dataset_phys(ds)->ds_compressed_bytes);
	return (ratio);
	}

	uint64_t
	dsl_get_logicalreferenced(dsl_dataset_t *ds)
	{
	return (dsl_dataset_phys(ds)->ds_uncompressed_bytes);
	}

	uint64_t
	dsl_get_compressratio(dsl_dataset_t *ds)
	{
	if (ds->ds_is_snapshot) {
	return (dsl_get_refratio(ds));
	} else {
	dsl_dir_t *dd = ds->ds_dir;
	mutex_enter(&dd->dd_lock);
	uint64_t val = dsl_dir_get_compressratio(dd);
	mutex_exit(&dd->dd_lock);
	return (val);
	}
	}

	uint64_t
	dsl_get_used(dsl_dataset_t *ds)
	{
	if (ds->ds_is_snapshot) {
	return (dsl_dataset_phys(ds)->ds_unique_bytes);
	} else {
	dsl_dir_t *dd = ds->ds_dir;
	mutex_enter(&dd->dd_lock);
	uint64_t val = dsl_dir_get_used(dd);
	mutex_exit(&dd->dd_lock);
	return (val);
	}
	}

	uint64_t
	dsl_get_creation(dsl_dataset_t *ds)
	{
	return (dsl_dataset_phys(ds)->ds_creation_time);
	}

	uint64_t
	dsl_get_creationtxg(dsl_dataset_t *ds)
	{
	return (dsl_dataset_phys(ds)->ds_creation_txg);
	}

	uint64_t
	dsl_get_refquota(dsl_dataset_t *ds)
	{
	return (ds->ds_quota);
	}

	uint64_t
	dsl_get_refreservation(dsl_dataset_t *ds)
	{
	return (ds->ds_reserved);
	}

	uint64_t
	dsl_get_guid(dsl_dataset_t *ds)
	{
	return (dsl_dataset_phys(ds)->ds_guid);
	}

	uint64_t
	dsl_get_unique(dsl_dataset_t *ds)
	{
	return (dsl_dataset_phys(ds)->ds_unique_bytes);
	}

	uint64_t
	dsl_get_objsetid(dsl_dataset_t *ds)
	{
	return (ds->ds_object);
	}

	uint64_t
	dsl_get_userrefs(dsl_dataset_t *ds)
	{
	return (ds->ds_userrefs);
	}

	uint64_t
	dsl_get_defer_destroy(dsl_dataset_t *ds)
	{
	return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
	}

	uint64_t
	dsl_get_referenced(dsl_dataset_t *ds)
	{
	return (dsl_dataset_phys(ds)->ds_referenced_bytes);
	}

	uint64_t
	dsl_get_numclones(dsl_dataset_t *ds)
	{
	ASSERT(ds->ds_is_snapshot);
	return (dsl_dataset_phys(ds)->ds_num_children - 1);
	}

	uint64_t
	dsl_get_inconsistent(dsl_dataset_t *ds)
	{
	return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ?
	1 : 0);
	}

	uint64_t
	dsl_get_redacted(dsl_dataset_t *ds)
	{
	return (dsl_dataset_feature_is_active(ds,
	SPA_FEATURE_REDACTED_DATASETS));
	}

	uint64_t
	dsl_get_available(dsl_dataset_t *ds)
	{
	uint64_t refdbytes = dsl_get_referenced(ds);
	uint64_t availbytes = dsl_dir_space_available(ds->ds_dir,
	NULL, 0, TRUE);
	if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
	availbytes +=
	ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
	}
	if (ds->ds_quota != 0) {
	/*
	* Adjust available bytes according to refquota
	*/
	if (refdbytes < ds->ds_quota) {
	availbytes = MIN(availbytes,
	ds->ds_quota - refdbytes);
	} else {
	availbytes = 0;
	}
	}
	return (availbytes);
	}

	int
	dsl_get_written(dsl_dataset_t ds, uint64_t written)
	{
	dsl_pool_t *dp = ds->ds_dir->dd_pool;
	dsl_dataset_t *prev;
	int err = dsl_dataset_hold_obj(dp,
	dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
	if (err == 0) {
	uint64_t comp, uncomp;
	err = dsl_dataset_space_written(prev, ds, written,
	&comp, &uncomp);
	dsl_dataset_rele(prev, FTAG);
	}
	return (err);
	}

	/*
	* 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN.
	*/
	int
	dsl_get_prev_snap(dsl_dataset_t ds, char snap)
	{
	dsl_pool_t *dp = ds->ds_dir->dd_pool;
	if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
	dsl_dataset_name(ds->ds_prev, snap);
	return (0);
	} else {
	return (SET_ERROR(ENOENT));
	}
	}

	void
	dsl_get_redact_snaps(dsl_dataset_t ds, nvlist_t propval)
	{
	uint64_t nsnaps;
	uint64_t *snaps;
	if (dsl_dataset_get_uint64_array_feature(ds,
	SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) {
	fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps,
	nsnaps);
	}
	}

	/*
	* Returns the mountpoint property and source for the given dataset in the value
	* and source buffers. The value buffer must be at least as large as MAXPATHLEN
	* and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN.
	* Returns 0 on success and an error on failure.
	*/
	int
	dsl_get_mountpoint(dsl_dataset_t ds, const char dsname, char *value,
	char *source)
	{
	int error;
	dsl_pool_t *dp = ds->ds_dir->dd_pool;

	/* Retrieve the mountpoint value stored in the zap object */
	error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1,
	ZAP_MAXVALUELEN, value, source);
	if (error != 0) {
	return (error);
	}

	/*
	* Process the dsname and source to find the full mountpoint string.
	* Can be skipped for 'legacy' or 'none'.
	*/
	if (value[0] == '/') {
	char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
	char *root = buf;
	const char *relpath;

	/*
	* If we inherit the mountpoint, even from a dataset
	* with a received value, the source will be the path of
	* the dataset we inherit from. If source is
	* ZPROP_SOURCE_VAL_RECVD, the received value is not
	* inherited.
	*/
	if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
	relpath = "";
	} else {
	ASSERT0(strncmp(dsname, source, strlen(source)));
	relpath = dsname + strlen(source);
	if (relpath[0] == '/')
	relpath++;
	}

	spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN);

	/*
	* Special case an alternate root of '/'. This will
	* avoid having multiple leading slashes in the
	* mountpoint path.
	*/
	if (strcmp(root, "/") == 0)
	root++;

	/*
	* If the mountpoint is '/' then skip over this
	* if we are obtaining either an alternate root or
	* an inherited mountpoint.
	*/
	char *mnt = value;
	if (value[1] == '\0' && (root[0] != '\0' \|\|
	relpath[0] != '\0'))
	mnt = value + 1;

	if (relpath[0] == '\0') {
	(void) snprintf(value, ZAP_MAXVALUELEN, "%s%s",
	root, mnt);
	} else {
	(void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s",
	root, mnt, relpath[0] == '@' ? "" : "/",
	relpath);
	}
	kmem_free(buf, ZAP_MAXVALUELEN);
	}

	return (0);
	}

	void
	dsl_dataset_stats(dsl_dataset_t ds, nvlist_t nv)
	{
	dsl_pool_t *dp = ds->ds_dir->dd_pool;

	ASSERT(dsl_pool_config_held(dp));

	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO,
	dsl_get_refratio(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
	dsl_get_logicalreferenced(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
	dsl_get_compressratio(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
	dsl_get_used(ds));

	if (ds->ds_is_snapshot) {
	get_clones_stat(ds, nv);
	} else {
	char buf[ZFS_MAX_DATASET_NAME_LEN];
	if (dsl_get_prev_snap(ds, buf) == 0)
	dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP,
	buf);
	dsl_dir_stats(ds->ds_dir, nv);
	}

	nvlist_t *propval = fnvlist_alloc();
	dsl_get_redact_snaps(ds, propval);
	fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS),
	propval);
	nvlist_free(propval);

	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE,
	dsl_get_available(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED,
	dsl_get_referenced(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
	dsl_get_creation(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
	dsl_get_creationtxg(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
	dsl_get_refquota(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
	dsl_get_refreservation(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
	dsl_get_guid(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
	dsl_get_unique(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
	dsl_get_objsetid(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
	dsl_get_userrefs(ds));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
	dsl_get_defer_destroy(ds));
	dsl_dataset_crypt_stats(ds, nv);

	if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
	uint64_t written;
	if (dsl_get_written(ds, &written) == 0) {
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
	written);
	}
	}

	if (!dsl_dataset_is_snapshot(ds)) {
	/*
	* A failed "newfs" (e.g. full) resumable receive leaves
	* the stats set on this dataset. Check here for the prop.
	*/
	get_receive_resume_stats(ds, nv);

	/*
	* A failed incremental resumable receive leaves the
	* stats set on our child named "%recv". Check the child
	* for the prop.
	*/
	/* 6 extra bytes for /%recv */
	char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
	dsl_dataset_t *recv_ds;
	dsl_dataset_name(ds, recvname);
	if (strlcat(recvname, "/", sizeof (recvname)) <
	sizeof (recvname) &&
	strlcat(recvname, recv_clone_name, sizeof (recvname)) <
	sizeof (recvname) &&
	dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
	get_receive_resume_stats(recv_ds, nv);
	dsl_dataset_rele(recv_ds, FTAG);
	}
	}
	}

	void
	dsl_dataset_fast_stat(dsl_dataset_t ds, dmu_objset_stats_t stat)
	{
	dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool;
	ASSERT(dsl_pool_config_held(dp));

	stat->dds_creation_txg = dsl_get_creationtxg(ds);
	stat->dds_inconsistent = dsl_get_inconsistent(ds);
	stat->dds_guid = dsl_get_guid(ds);
	stat->dds_redacted = dsl_get_redacted(ds);
	stat->dds_origin[0] = '\0';
	if (ds->ds_is_snapshot) {
	stat->dds_is_snapshot = B_TRUE;
	stat->dds_num_clones = dsl_get_numclones(ds);
	} else {
	stat->dds_is_snapshot = B_FALSE;
	stat->dds_num_clones = 0;

	if (dsl_dir_is_clone(ds->ds_dir)) {
	dsl_dir_get_origin(ds->ds_dir, stat->dds_origin);
	}
	}
	}

	uint64_t
	dsl_dataset_fsid_guid(dsl_dataset_t *ds)
	{
	return (ds->ds_fsid_guid);
	}

	void
	dsl_dataset_space(dsl_dataset_t *ds,
	uint64_t refdbytesp, uint64_t availbytesp,
	uint64_t usedobjsp, uint64_t availobjsp)
	{
	*refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
	*availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
	if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
	*availbytesp +=
	ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
	if (ds->ds_quota != 0) {
	/*
	* Adjust available bytes according to refquota
	*/
	if (*refdbytesp < ds->ds_quota)
	availbytesp = MIN(availbytesp,
	ds->ds_quota - *refdbytesp);
	else
	*availbytesp = 0;
	}
	rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
	*usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
	rrw_exit(&ds->ds_bp_rwlock, FTAG);
	availobjsp = DN_MAX_OBJECT - usedobjsp;
	}

	boolean_t
	dsl_dataset_modified_since_snap(dsl_dataset_t ds, dsl_dataset_t snap)
	{
	dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool;
	uint64_t birth;

	ASSERT(dsl_pool_config_held(dp));
	if (snap == NULL)
	return (B_FALSE);
	rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
	birth = dsl_dataset_get_blkptr(ds)->blk_birth;
	rrw_exit(&ds->ds_bp_rwlock, FTAG);
	if (birth > dsl_dataset_phys(snap)->ds_creation_txg) {
	objset_t os, os_snap;
	/*
	* It may be that only the ZIL differs, because it was
	* reset in the head. Don't count that as being
	* modified.
	*/
	if (dmu_objset_from_ds(ds, &os) != 0)
	return (B_TRUE);
	if (dmu_objset_from_ds(snap, &os_snap) != 0)
	return (B_TRUE);
	return (bcmp(&os->os_phys->os_meta_dnode,
	&os_snap->os_phys->os_meta_dnode,
	sizeof (os->os_phys->os_meta_dnode)) != 0);
	}
	return (B_FALSE);
	}

	typedef struct dsl_dataset_rename_snapshot_arg {
	const char *ddrsa_fsname;
	const char *ddrsa_oldsnapname;
	const char *ddrsa_newsnapname;
	boolean_t ddrsa_recursive;
	dmu_tx_t *ddrsa_tx;
	} dsl_dataset_rename_snapshot_arg_t;

	/* ARGSUSED */
	static int
	dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
	dsl_dataset_t hds, void arg)
	{
	dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
	int error;
	uint64_t val;

	error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
	if (error != 0) {
	/* ignore nonexistent snapshots */
	return (error == ENOENT ? 0 : error);
	}

	/* new name should not exist */
	error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
	if (error == 0)
	error = SET_ERROR(EEXIST);
	else if (error == ENOENT)
	error = 0;

	/* dataset name + 1 for the "@" + the new snapshot name must fit */
	if (dsl_dir_namelen(hds->ds_dir) + 1 +
	strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN)
	error = SET_ERROR(ENAMETOOLONG);

	return (error);
	}

	static int
	dsl_dataset_rename_snapshot_check(void arg, dmu_tx_t tx)
	{
	dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *hds;
	int error;

	error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
	if (error != 0)
	return (error);

	if (ddrsa->ddrsa_recursive) {
	error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
	dsl_dataset_rename_snapshot_check_impl, ddrsa,
	DS_FIND_CHILDREN);
	} else {
	error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
	}
	dsl_dataset_rele(hds, FTAG);
	return (error);
	}

	static int
	dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
	dsl_dataset_t hds, void arg)
	{
	dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
	dsl_dataset_t *ds;
	uint64_t val;
	dmu_tx_t *tx = ddrsa->ddrsa_tx;
	int error;

	error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
	ASSERT(error == 0 \|\| error == ENOENT);
	if (error == ENOENT) {
	/* ignore nonexistent snapshots */
	return (0);
	}

	VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));

	/* log before we change the name */
	spa_history_log_internal_ds(ds, "rename", tx,
	"-> @%s", ddrsa->ddrsa_newsnapname);

	VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
	B_FALSE));
	mutex_enter(&ds->ds_lock);
	(void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname,
	sizeof (ds->ds_snapname));
	mutex_exit(&ds->ds_lock);
	VERIFY0(zap_add(dp->dp_meta_objset,
	dsl_dataset_phys(hds)->ds_snapnames_zapobj,
	ds->ds_snapname, 8, 1, &ds->ds_object, tx));
	zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname,
	ddrsa->ddrsa_newsnapname, B_TRUE);

	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	static void
	dsl_dataset_rename_snapshot_sync(void arg, dmu_tx_t tx)
	{
	dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *hds = NULL;

	VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
	ddrsa->ddrsa_tx = tx;
	if (ddrsa->ddrsa_recursive) {
	VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
	dsl_dataset_rename_snapshot_sync_impl, ddrsa,
	DS_FIND_CHILDREN));
	} else {
	VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
	}
	dsl_dataset_rele(hds, FTAG);
	}

	int
	dsl_dataset_rename_snapshot(const char *fsname,
	const char oldsnapname, const char newsnapname, boolean_t recursive)
	{
	dsl_dataset_rename_snapshot_arg_t ddrsa;

	ddrsa.ddrsa_fsname = fsname;
	ddrsa.ddrsa_oldsnapname = oldsnapname;
	ddrsa.ddrsa_newsnapname = newsnapname;
	ddrsa.ddrsa_recursive = recursive;

	return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
	dsl_dataset_rename_snapshot_sync, &ddrsa,
	1, ZFS_SPACE_CHECK_RESERVED));
	}

	/*
	* If we're doing an ownership handoff, we need to make sure that there is
	* only one long hold on the dataset. We're not allowed to change anything here
	* so we don't permanently release the long hold or regular hold here. We want
	* to do this only when syncing to avoid the dataset unexpectedly going away
	* when we release the long hold.
	*/
	static int
	dsl_dataset_handoff_check(dsl_dataset_t ds, void owner, dmu_tx_t *tx)
	{
	boolean_t held = B_FALSE;

	if (!dmu_tx_is_syncing(tx))
	return (0);

	dsl_dir_t *dd = ds->ds_dir;
	mutex_enter(&dd->dd_activity_lock);
	uint64_t holds = zfs_refcount_count(&ds->ds_longholds) -
	(owner != NULL ? 1 : 0);
	/*
	* The value of dd_activity_waiters can chance as soon as we drop the
	* lock, but we're fine with that; new waiters coming in or old
	* waiters leaving doesn't cause problems, since we're going to cancel
	* waiters later anyway. The goal of this check is to verify that no
	* non-waiters have long-holds, and all new long-holds will be
	* prevented because we're holding the pool config as writer.
	*/
	if (holds != dd->dd_activity_waiters)
	held = B_TRUE;
	mutex_exit(&dd->dd_activity_lock);

	if (held)
	return (SET_ERROR(EBUSY));

	return (0);
	}

	int
	dsl_dataset_rollback_check(void arg, dmu_tx_t tx)
	{
	dsl_dataset_rollback_arg_t *ddra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	int64_t unused_refres_delta;
	int error;

	error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
	if (error != 0)
	return (error);

	/* must not be a snapshot */
	if (ds->ds_is_snapshot) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(EINVAL));
	}

	/* must have a most recent snapshot */
	if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(ESRCH));
	}

	/*
	* No rollback to a snapshot created in the current txg, because
	* the rollback may dirty the dataset and create blocks that are
	* not reachable from the rootbp while having a birth txg that
	* falls into the snapshot's range.
	*/
	if (dmu_tx_is_syncing(tx) &&
	dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(EAGAIN));
	}

	/*
	* If the expected target snapshot is specified, then check that
	* the latest snapshot is it.
	*/
	if (ddra->ddra_tosnap != NULL) {
	dsl_dataset_t *snapds;

	/* Check if the target snapshot exists at all. */
	error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds);
	if (error != 0) {
	/*
	* ESRCH is used to signal that the target snapshot does
	* not exist, while ENOENT is used to report that
	* the rolled back dataset does not exist.
	* ESRCH is also used to cover other cases where the
	* target snapshot is not related to the dataset being
	* rolled back such as being in a different pool.
	*/
	if (error == ENOENT \|\| error == EXDEV)
	error = SET_ERROR(ESRCH);
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}
	ASSERT(snapds->ds_is_snapshot);

	/* Check if the snapshot is the latest snapshot indeed. */
	if (snapds != ds->ds_prev) {
	/*
	* Distinguish between the case where the only problem
	* is intervening snapshots (EEXIST) vs the snapshot
	* not being a valid target for rollback (ESRCH).
	*/
	if (snapds->ds_dir == ds->ds_dir \|\|
	(dsl_dir_is_clone(ds->ds_dir) &&
	dsl_dir_phys(ds->ds_dir)->dd_origin_obj ==
	snapds->ds_object)) {
	error = SET_ERROR(EEXIST);
	} else {
	error = SET_ERROR(ESRCH);
	}
	dsl_dataset_rele(snapds, FTAG);
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}
	dsl_dataset_rele(snapds, FTAG);
	}

	/* must not have any bookmarks after the most recent snapshot */
	if (dsl_bookmark_latest_txg(ds) >
	dsl_dataset_phys(ds)->ds_prev_snap_txg) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(EEXIST));
	}

	error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	/*
	* Check if the snap we are rolling back to uses more than
	* the refquota.
	*/
	if (ds->ds_quota != 0 &&
	dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(EDQUOT));
	}

	/*
	* When we do the clone swap, we will temporarily use more space
	* due to the refreservation (the head will no longer have any
	* unique space, so the entire amount of the refreservation will need
	* to be free). We will immediately destroy the clone, freeing
	* this space, but the freeing happens over many txg's.
	*/
	unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
	dsl_dataset_phys(ds)->ds_unique_bytes);

	if (unused_refres_delta > 0 &&
	unused_refres_delta >
	dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(ENOSPC));
	}

	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	void
	dsl_dataset_rollback_sync(void arg, dmu_tx_t tx)
	{
	dsl_dataset_rollback_arg_t *ddra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t ds, clone;
	uint64_t cloneobj;
	char namebuf[ZFS_MAX_DATASET_NAME_LEN];

	VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));

	dsl_dataset_name(ds->ds_prev, namebuf);
	fnvlist_add_string(ddra->ddra_result, "target", namebuf);

	cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
	ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx);

	VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));

	dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
	dsl_dataset_zero_zil(ds, tx);

	dsl_destroy_head_sync_impl(clone, tx);

	dsl_dataset_rele(clone, FTAG);
	dsl_dataset_rele(ds, FTAG);
	}

	/*
	* Rolls back the given filesystem or volume to the most recent snapshot.
	* The name of the most recent snapshot will be returned under key "target"
	* in the result nvlist.
	*
	* If owner != NULL:
	* - The existing dataset MUST be owned by the specified owner at entry
	* - Upon return, dataset will still be held by the same owner, whether we
	* succeed or not.
	*
	* This mode is required any time the existing filesystem is mounted. See
	* notes above zfs_suspend_fs() for further details.
	*/
	int
	dsl_dataset_rollback(const char fsname, const char tosnap, void *owner,
	nvlist_t *result)
	{
	dsl_dataset_rollback_arg_t ddra;

	ddra.ddra_fsname = fsname;
	ddra.ddra_tosnap = tosnap;
	ddra.ddra_owner = owner;
	ddra.ddra_result = result;

	return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
	dsl_dataset_rollback_sync, &ddra,
	1, ZFS_SPACE_CHECK_RESERVED));
	}

	struct promotenode {
	list_node_t link;
	dsl_dataset_t *ds;
	};

	static int snaplist_space(list_t l, uint64_t mintxg, uint64_t spacep);
	static int promote_hold(dsl_dataset_promote_arg_t ddpa, dsl_pool_t dp,
	void *tag);
	static void promote_rele(dsl_dataset_promote_arg_t ddpa, void tag);

	int
	dsl_dataset_promote_check(void arg, dmu_tx_t tx)
	{
	dsl_dataset_promote_arg_t *ddpa = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *hds;
	struct promotenode *snap;
	dsl_dataset_t origin_ds, origin_head;
	int err;
	uint64_t unused;
	uint64_t ss_mv_cnt;
	size_t max_snap_len;
	boolean_t conflicting_snaps;

	err = promote_hold(ddpa, dp, FTAG);
	if (err != 0)
	return (err);

	hds = ddpa->ddpa_clone;
	max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;

	if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
	promote_rele(ddpa, FTAG);
	return (SET_ERROR(EXDEV));
	}

	snap = list_head(&ddpa->shared_snaps);
	origin_head = snap->ds;
	if (snap == NULL) {
	err = SET_ERROR(ENOENT);
	goto out;
	}
	origin_ds = snap->ds;

	/*
	* Encrypted clones share a DSL Crypto Key with their origin's dsl dir.
	* When doing a promote we must make sure the encryption root for
	* both the target and the target's origin does not change to avoid
	* needing to rewrap encryption keys
	*/
	err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir);
	if (err != 0)
	goto out;

	/*
	* Compute and check the amount of space to transfer. Since this is
	* so expensive, don't do the preliminary check.
	*/
	if (!dmu_tx_is_syncing(tx)) {
	promote_rele(ddpa, FTAG);
	return (0);
	}

	/* compute origin's new unique space */
	snap = list_tail(&ddpa->clone_snaps);
	ASSERT(snap != NULL);
	ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
	origin_ds->ds_object);
	dsl_deadlist_space_range(&snap->ds->ds_deadlist,
	dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
	&ddpa->unique, &unused, &unused);

	/*
	* Walk the snapshots that we are moving
	*
	* Compute space to transfer. Consider the incremental changes
	* to used by each snapshot:
	* (my used) = (prev's used) + (blocks born) - (blocks killed)
	* So each snapshot gave birth to:
	* (blocks born) = (my used) - (prev's used) + (blocks killed)
	* So a sequence would look like:
	* (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
	* Which simplifies to:
	* uN + kN + kN-1 + ... + k1 + k0
	* Note however, if we stop before we reach the ORIGIN we get:
	* uN + kN + kN-1 + ... + kM - uM-1
	*/
	conflicting_snaps = B_FALSE;
	ss_mv_cnt = 0;
	ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
	ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
	ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
	for (snap = list_head(&ddpa->shared_snaps); snap;
	snap = list_next(&ddpa->shared_snaps, snap)) {
	uint64_t val, dlused, dlcomp, dluncomp;
	dsl_dataset_t *ds = snap->ds;

	ss_mv_cnt++;

	/*
	* If there are long holds, we won't be able to evict
	* the objset.
	*/
	if (dsl_dataset_long_held(ds)) {
	err = SET_ERROR(EBUSY);
	goto out;
	}

	/* Check that the snapshot name does not conflict */
	VERIFY0(dsl_dataset_get_snapname(ds));
	if (strlen(ds->ds_snapname) >= max_snap_len) {
	err = SET_ERROR(ENAMETOOLONG);
	goto out;
	}
	err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
	if (err == 0) {
	fnvlist_add_boolean(ddpa->err_ds,
	snap->ds->ds_snapname);
	conflicting_snaps = B_TRUE;
	} else if (err != ENOENT) {
	goto out;
	}

	/* The very first snapshot does not have a deadlist */
	if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
	continue;

	dsl_deadlist_space(&ds->ds_deadlist,
	&dlused, &dlcomp, &dluncomp);
	ddpa->used += dlused;
	ddpa->comp += dlcomp;
	ddpa->uncomp += dluncomp;
	}

	/*
	* Check that bookmarks that are being transferred don't have
	* name conflicts.
	*/
	for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks);
	dbn != NULL && dbn->dbn_phys.zbm_creation_txg <=
	dsl_dataset_phys(origin_ds)->ds_creation_txg;
	dbn = AVL_NEXT(&origin_head->ds_bookmarks, dbn)) {
	if (strlen(dbn->dbn_name) >= max_snap_len) {
	err = SET_ERROR(ENAMETOOLONG);
	goto out;
	}
	zfs_bookmark_phys_t bm;
	err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone,
	dbn->dbn_name, &bm);

	if (err == 0) {
	fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name);
	conflicting_snaps = B_TRUE;
	} else if (err == ESRCH) {
	err = 0;
	} else if (err != 0) {
	goto out;
	}
	}

	/*
	* In order to return the full list of conflicting snapshots, we check
	* whether there was a conflict after traversing all of them.
	*/
	if (conflicting_snaps) {
	err = SET_ERROR(EEXIST);
	goto out;
	}

	/*
	* If we are a clone of a clone then we never reached ORIGIN,
	* so we need to subtract out the clone origin's used space.
	*/
	if (ddpa->origin_origin) {
	ddpa->used -=
	dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
	ddpa->comp -=
	dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
	ddpa->uncomp -=
	dsl_dataset_phys(ddpa->origin_origin)->
	ds_uncompressed_bytes;
	}

	/* Check that there is enough space and limit headroom here */
	err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
	0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc);
	if (err != 0)
	goto out;

	/*
	* Compute the amounts of space that will be used by snapshots
	* after the promotion (for both origin and clone). For each,
	* it is the amount of space that will be on all of their
	* deadlists (that was not born before their new origin).
	*/
	if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
	uint64_t space;

	/*
	* Note, typically this will not be a clone of a clone,
	* so dd_origin_txg will be < TXG_INITIAL, so
	* these snaplist_space() -> dsl_deadlist_space_range()
	* calls will be fast because they do not have to
	* iterate over all bps.
	*/
	snap = list_head(&ddpa->origin_snaps);
	if (snap == NULL) {
	err = SET_ERROR(ENOENT);
	goto out;
	}
	err = snaplist_space(&ddpa->shared_snaps,
	snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
	if (err != 0)
	goto out;

	err = snaplist_space(&ddpa->clone_snaps,
	snap->ds->ds_dir->dd_origin_txg, &space);
	if (err != 0)
	goto out;
	ddpa->cloneusedsnap += space;
	}
	if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
	DD_FLAG_USED_BREAKDOWN) {
	err = snaplist_space(&ddpa->origin_snaps,
	dsl_dataset_phys(origin_ds)->ds_creation_txg,
	&ddpa->originusedsnap);
	if (err != 0)
	goto out;
	}

	out:
	promote_rele(ddpa, FTAG);
	return (err);
	}

	void
	dsl_dataset_promote_sync(void arg, dmu_tx_t tx)
	{
	dsl_dataset_promote_arg_t *ddpa = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *hds;
	struct promotenode *snap;
	dsl_dataset_t *origin_ds;
	dsl_dataset_t *origin_head;
	dsl_dir_t *dd;
	dsl_dir_t *odd = NULL;
	uint64_t oldnext_obj;
	int64_t delta;

	ASSERT(nvlist_empty(ddpa->err_ds));

	VERIFY0(promote_hold(ddpa, dp, FTAG));
	hds = ddpa->ddpa_clone;

	ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);

	snap = list_head(&ddpa->shared_snaps);
	origin_ds = snap->ds;
	dd = hds->ds_dir;

	snap = list_head(&ddpa->origin_snaps);
	origin_head = snap->ds;

	/*
	* We need to explicitly open odd, since origin_ds's dd will be
	* changing.
	*/
	VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
	NULL, FTAG, &odd));

	dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx);

	/* change origin's next snap */
	dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
	oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
	snap = list_tail(&ddpa->clone_snaps);
	ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
	origin_ds->ds_object);
	dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;

	/* change the origin's next clone */
	if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
	dsl_dataset_remove_from_next_clones(origin_ds,
	snap->ds->ds_object, tx);
	VERIFY0(zap_add_int(dp->dp_meta_objset,
	dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
	oldnext_obj, tx));
	}

	/* change origin */
	dmu_buf_will_dirty(dd->dd_dbuf, tx);
	ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
	dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
	dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
	dmu_buf_will_dirty(odd->dd_dbuf, tx);
	dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
	origin_head->ds_dir->dd_origin_txg =
	dsl_dataset_phys(origin_ds)->ds_creation_txg;

	/* change dd_clone entries */
	if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
	VERIFY0(zap_remove_int(dp->dp_meta_objset,
	dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
	VERIFY0(zap_add_int(dp->dp_meta_objset,
	dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
	hds->ds_object, tx));

	VERIFY0(zap_remove_int(dp->dp_meta_objset,
	dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
	origin_head->ds_object, tx));
	if (dsl_dir_phys(dd)->dd_clones == 0) {
	dsl_dir_phys(dd)->dd_clones =
	zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
	DMU_OT_NONE, 0, tx);
	}
	VERIFY0(zap_add_int(dp->dp_meta_objset,
	dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
	}

	/*
	* Move bookmarks to this dir.
	*/
	dsl_bookmark_node_t *dbn_next;
	for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks);
	dbn != NULL && dbn->dbn_phys.zbm_creation_txg <=
	dsl_dataset_phys(origin_ds)->ds_creation_txg;
	dbn = dbn_next) {
	dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn);

	avl_remove(&origin_head->ds_bookmarks, dbn);
	VERIFY0(zap_remove(dp->dp_meta_objset,
	origin_head->ds_bookmarks_obj, dbn->dbn_name, tx));

	dsl_bookmark_node_add(hds, dbn, tx);
	}

	dsl_bookmark_next_changed(hds, origin_ds, tx);

	/* move snapshots to this dir */
	for (snap = list_head(&ddpa->shared_snaps); snap;
	snap = list_next(&ddpa->shared_snaps, snap)) {
	dsl_dataset_t *ds = snap->ds;

	/*
	* Property callbacks are registered to a particular
	* dsl_dir. Since ours is changing, evict the objset
	* so that they will be unregistered from the old dsl_dir.
	*/
	if (ds->ds_objset) {
	dmu_objset_evict(ds->ds_objset);
	ds->ds_objset = NULL;
	}

	/* move snap name entry */
	VERIFY0(dsl_dataset_get_snapname(ds));
	VERIFY0(dsl_dataset_snap_remove(origin_head,
	ds->ds_snapname, tx, B_TRUE));
	VERIFY0(zap_add(dp->dp_meta_objset,
	dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
	8, 1, &ds->ds_object, tx));
	dsl_fs_ss_count_adjust(hds->ds_dir, 1,
	DD_FIELD_SNAPSHOT_COUNT, tx);

	/* change containing dsl_dir */
	dmu_buf_will_dirty(ds->ds_dbuf, tx);
	ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
	dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
	ASSERT3P(ds->ds_dir, ==, odd);
	dsl_dir_rele(ds->ds_dir, ds);
	VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
	NULL, ds, &ds->ds_dir));

	/* move any clone references */
	if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
	spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
	zap_cursor_t zc;
	zap_attribute_t za;

	for (zap_cursor_init(&zc, dp->dp_meta_objset,
	dsl_dataset_phys(ds)->ds_next_clones_obj);
	zap_cursor_retrieve(&zc, &za) == 0;
	zap_cursor_advance(&zc)) {
	dsl_dataset_t *cnds;
	uint64_t o;

	if (za.za_first_integer == oldnext_obj) {
	/*
	* We've already moved the
	* origin's reference.
	*/
	continue;
	}

	VERIFY0(dsl_dataset_hold_obj(dp,
	za.za_first_integer, FTAG, &cnds));
	o = dsl_dir_phys(cnds->ds_dir)->
	dd_head_dataset_obj;

	VERIFY0(zap_remove_int(dp->dp_meta_objset,
	dsl_dir_phys(odd)->dd_clones, o, tx));
	VERIFY0(zap_add_int(dp->dp_meta_objset,
	dsl_dir_phys(dd)->dd_clones, o, tx));
	dsl_dataset_rele(cnds, FTAG);
	}
	zap_cursor_fini(&zc);
	}

	ASSERT(!dsl_prop_hascb(ds));
	}

	/*
	* Change space accounting.
	* Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
	* both be valid, or both be 0 (resulting in delta == 0). This
	* is true for each of {clone,origin} independently.
	*/

	delta = ddpa->cloneusedsnap -
	dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
	ASSERT3S(delta, >=, 0);
	ASSERT3U(ddpa->used, >=, delta);
	dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
	dsl_dir_diduse_space(dd, DD_USED_HEAD,
	ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);

	delta = ddpa->originusedsnap -
	dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
	ASSERT3S(delta, <=, 0);
	ASSERT3U(ddpa->used, >=, -delta);
	dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
	dsl_dir_diduse_space(odd, DD_USED_HEAD,
	-ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);

	dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;

	/*
	* Since livelists are specific to a clone's origin txg, they
	* are no longer accurate. Destroy the livelist from the clone being
	* promoted. If the origin dataset is a clone, destroy its livelist
	* as well.
	*/
	dsl_dir_remove_livelist(dd, tx, B_TRUE);
	dsl_dir_remove_livelist(odd, tx, B_TRUE);

	/* log history record */
	spa_history_log_internal_ds(hds, "promote", tx, " ");

	dsl_dir_rele(odd, FTAG);
	promote_rele(ddpa, FTAG);
	}

	/*
	* Make a list of dsl_dataset_t's for the snapshots between first_obj
	* (exclusive) and last_obj (inclusive). The list will be in reverse
	* order (last_obj will be the list_head()). If first_obj == 0, do all
	* snapshots back to this dataset's origin.
	*/
	static int
	snaplist_make(dsl_pool_t *dp,
	uint64_t first_obj, uint64_t last_obj, list_t l, void tag)
	{
	uint64_t obj = last_obj;

	list_create(l, sizeof (struct promotenode),
	offsetof(struct promotenode, link));

	while (obj != first_obj) {
	dsl_dataset_t *ds;
	struct promotenode *snap;
	int err;

	err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
	ASSERT(err != ENOENT);
	if (err != 0)
	return (err);

	if (first_obj == 0)
	first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;

	snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
	snap->ds = ds;
	list_insert_tail(l, snap);
	obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
	}

	return (0);
	}

	static int
	snaplist_space(list_t l, uint64_t mintxg, uint64_t spacep)
	{
	struct promotenode *snap;

	*spacep = 0;
	for (snap = list_head(l); snap; snap = list_next(l, snap)) {
	uint64_t used, comp, uncomp;
	dsl_deadlist_space_range(&snap->ds->ds_deadlist,
	mintxg, UINT64_MAX, &used, &comp, &uncomp);
	*spacep += used;
	}
	return (0);
	}

	static void
	snaplist_destroy(list_t l, void tag)
	{
	struct promotenode *snap;

	if (l == NULL \|\| !list_link_active(&l->list_head))
	return;

	while ((snap = list_tail(l)) != NULL) {
	list_remove(l, snap);
	dsl_dataset_rele(snap->ds, tag);
	kmem_free(snap, sizeof (*snap));
	}
	list_destroy(l);
	}

	static int
	promote_hold(dsl_dataset_promote_arg_t ddpa, dsl_pool_t dp, void *tag)
	{
	int error;
	dsl_dir_t *dd;
	struct promotenode *snap;

	error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
	&ddpa->ddpa_clone);
	if (error != 0)
	return (error);
	dd = ddpa->ddpa_clone->ds_dir;

	if (ddpa->ddpa_clone->ds_is_snapshot \|\|
	!dsl_dir_is_clone(dd)) {
	dsl_dataset_rele(ddpa->ddpa_clone, tag);
	return (SET_ERROR(EINVAL));
	}

	error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
	&ddpa->shared_snaps, tag);
	if (error != 0)
	goto out;

	error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
	&ddpa->clone_snaps, tag);
	if (error != 0)
	goto out;

	snap = list_head(&ddpa->shared_snaps);
	ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
	error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
	dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
	&ddpa->origin_snaps, tag);
	if (error != 0)
	goto out;

	if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
	error = dsl_dataset_hold_obj(dp,
	dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
	tag, &ddpa->origin_origin);
	if (error != 0)
	goto out;
	}
	out:
	if (error != 0)
	promote_rele(ddpa, tag);
	return (error);
	}

	static void
	promote_rele(dsl_dataset_promote_arg_t ddpa, void tag)
	{
	snaplist_destroy(&ddpa->shared_snaps, tag);
	snaplist_destroy(&ddpa->clone_snaps, tag);
	snaplist_destroy(&ddpa->origin_snaps, tag);
	if (ddpa->origin_origin != NULL)
	dsl_dataset_rele(ddpa->origin_origin, tag);
	dsl_dataset_rele(ddpa->ddpa_clone, tag);
	}

	/*
	* Promote a clone.
	*
	* If it fails due to a conflicting snapshot name, "conflsnap" will be filled
	* in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
	*/
	int
	dsl_dataset_promote(const char name, char conflsnap)
	{
	dsl_dataset_promote_arg_t ddpa = { 0 };
	uint64_t numsnaps;
	int error;
	nvpair_t *snap_pair;
	objset_t *os;

	/*
	* We will modify space proportional to the number of
	* snapshots. Compute numsnaps.
	*/
	error = dmu_objset_hold(name, FTAG, &os);
	if (error != 0)
	return (error);
	error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
	dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
	&numsnaps);
	dmu_objset_rele(os, FTAG);
	if (error != 0)
	return (error);

	ddpa.ddpa_clonename = name;
	ddpa.err_ds = fnvlist_alloc();
	ddpa.cr = CRED();
	ddpa.proc = curproc;

	error = dsl_sync_task(name, dsl_dataset_promote_check,
	dsl_dataset_promote_sync, &ddpa,
	2 + numsnaps, ZFS_SPACE_CHECK_RESERVED);

	/*
	* Return the first conflicting snapshot found.
	*/
	snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL);
	if (snap_pair != NULL && conflsnap != NULL)
	(void) strlcpy(conflsnap, nvpair_name(snap_pair),
	ZFS_MAX_DATASET_NAME_LEN);

	fnvlist_free(ddpa.err_ds);
	return (error);
	}

	int
	dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
	dsl_dataset_t origin_head, boolean_t force, void owner, dmu_tx_t *tx)
	{
	/*
	* "slack" factor for received datasets with refquota set on them.
	* See the bottom of this function for details on its use.
	*/
	uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS *
	spa_asize_inflation;
	int64_t unused_refres_delta;

	/* they should both be heads */
	if (clone->ds_is_snapshot \|\|
	origin_head->ds_is_snapshot)
	return (SET_ERROR(EINVAL));

	/* if we are not forcing, the branch point should be just before them */
	if (!force && clone->ds_prev != origin_head->ds_prev)
	return (SET_ERROR(EINVAL));

	/* clone should be the clone (unless they are unrelated) */
	if (clone->ds_prev != NULL &&
	clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
	origin_head->ds_dir != clone->ds_prev->ds_dir)
	return (SET_ERROR(EINVAL));

	/* the clone should be a child of the origin */
	if (clone->ds_dir->dd_parent != origin_head->ds_dir)
	return (SET_ERROR(EINVAL));

	/* origin_head shouldn't be modified unless 'force' */
	if (!force &&
	dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
	return (SET_ERROR(ETXTBSY));

	/* origin_head should have no long holds (e.g. is not mounted) */
	if (dsl_dataset_handoff_check(origin_head, owner, tx))
	return (SET_ERROR(EBUSY));

	/* check amount of any unconsumed refreservation */
	unused_refres_delta =
	(int64_t)MIN(origin_head->ds_reserved,
	dsl_dataset_phys(origin_head)->ds_unique_bytes) -
	(int64_t)MIN(origin_head->ds_reserved,
	dsl_dataset_phys(clone)->ds_unique_bytes);

	if (unused_refres_delta > 0 &&
	unused_refres_delta >
	dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
	return (SET_ERROR(ENOSPC));

	/*
	* The clone can't be too much over the head's refquota.
	*
	* To ensure that the entire refquota can be used, we allow one
	* transaction to exceed the refquota. Therefore, this check
	* needs to also allow for the space referenced to be more than the
	* refquota. The maximum amount of space that one transaction can use
	* on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
	* overage ensures that we are able to receive a filesystem that
	* exceeds the refquota on the source system.
	*
	* So that overage is the refquota_slack we use below.
	*/
	if (origin_head->ds_quota != 0 &&
	dsl_dataset_phys(clone)->ds_referenced_bytes >
	origin_head->ds_quota + refquota_slack)
	return (SET_ERROR(EDQUOT));

	return (0);
	}

	static void
	dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone,
	dsl_dataset_t origin, dmu_tx_t tx)
	{
	uint64_t clone_remap_dl_obj, origin_remap_dl_obj;
	dsl_pool_t *dp = dmu_tx_pool(tx);

	ASSERT(dsl_pool_sync_context(dp));

	clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone);
	origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin);

	if (clone_remap_dl_obj != 0) {
	dsl_deadlist_close(&clone->ds_remap_deadlist);
	dsl_dataset_unset_remap_deadlist_object(clone, tx);
	}
	if (origin_remap_dl_obj != 0) {
	dsl_deadlist_close(&origin->ds_remap_deadlist);
	dsl_dataset_unset_remap_deadlist_object(origin, tx);
	}

	if (clone_remap_dl_obj != 0) {
	dsl_dataset_set_remap_deadlist_object(origin,
	clone_remap_dl_obj, tx);
	dsl_deadlist_open(&origin->ds_remap_deadlist,
	dp->dp_meta_objset, clone_remap_dl_obj);
	}
	if (origin_remap_dl_obj != 0) {
	dsl_dataset_set_remap_deadlist_object(clone,
	origin_remap_dl_obj, tx);
	dsl_deadlist_open(&clone->ds_remap_deadlist,
	dp->dp_meta_objset, origin_remap_dl_obj);
	}
	}

	void
	dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
	dsl_dataset_t origin_head, dmu_tx_t tx)
	{
	dsl_pool_t *dp = dmu_tx_pool(tx);
	int64_t unused_refres_delta;

	ASSERT(clone->ds_reserved == 0);
	/*
	* NOTE: On DEBUG kernels there could be a race between this and
	* the check function if spa_asize_inflation is adjusted...
	*/
	ASSERT(origin_head->ds_quota == 0 \|\|
	dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
	DMU_MAX_ACCESS * spa_asize_inflation);
	ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);

	dsl_dir_cancel_waiters(origin_head->ds_dir);

	/*
	* Swap per-dataset feature flags.
	*/
	for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
	if (!(spa_feature_table[f].fi_flags &
	ZFEATURE_FLAG_PER_DATASET)) {
	ASSERT(!dsl_dataset_feature_is_active(clone, f));
	ASSERT(!dsl_dataset_feature_is_active(origin_head, f));
	continue;
	}

	boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f);
	void *clone_feature = clone->ds_feature[f];
	boolean_t origin_head_inuse =
	dsl_dataset_feature_is_active(origin_head, f);
	void *origin_head_feature = origin_head->ds_feature[f];

	if (clone_inuse)
	dsl_dataset_deactivate_feature_impl(clone, f, tx);
	if (origin_head_inuse)
	dsl_dataset_deactivate_feature_impl(origin_head, f, tx);

	if (clone_inuse) {
	dsl_dataset_activate_feature(origin_head->ds_object, f,
	clone_feature, tx);
	origin_head->ds_feature[f] = clone_feature;
	}
	if (origin_head_inuse) {
	dsl_dataset_activate_feature(clone->ds_object, f,
	origin_head_feature, tx);
	clone->ds_feature[f] = origin_head_feature;
	}
	}

	dmu_buf_will_dirty(clone->ds_dbuf, tx);
	dmu_buf_will_dirty(origin_head->ds_dbuf, tx);

	if (clone->ds_objset != NULL) {
	dmu_objset_evict(clone->ds_objset);
	clone->ds_objset = NULL;
	}

	if (origin_head->ds_objset != NULL) {
	dmu_objset_evict(origin_head->ds_objset);
	origin_head->ds_objset = NULL;
	}

	unused_refres_delta =
	(int64_t)MIN(origin_head->ds_reserved,
	dsl_dataset_phys(origin_head)->ds_unique_bytes) -
	(int64_t)MIN(origin_head->ds_reserved,
	dsl_dataset_phys(clone)->ds_unique_bytes);

	/*
	* Reset origin's unique bytes.
	*/
	{
	dsl_dataset_t *origin = clone->ds_prev;
	uint64_t comp, uncomp;

	dmu_buf_will_dirty(origin->ds_dbuf, tx);
	dsl_deadlist_space_range(&clone->ds_deadlist,
	dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
	&dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
	}

	/* swap blkptrs */
	{
	rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG);
	rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG);
	blkptr_t tmp;
	tmp = dsl_dataset_phys(origin_head)->ds_bp;
	dsl_dataset_phys(origin_head)->ds_bp =
	dsl_dataset_phys(clone)->ds_bp;
	dsl_dataset_phys(clone)->ds_bp = tmp;
	rrw_exit(&origin_head->ds_bp_rwlock, FTAG);
	rrw_exit(&clone->ds_bp_rwlock, FTAG);
	}

	/* set dd__bytes /
	{
	int64_t dused, dcomp, duncomp;
	uint64_t cdl_used, cdl_comp, cdl_uncomp;
	uint64_t odl_used, odl_comp, odl_uncomp;

	ASSERT3U(dsl_dir_phys(clone->ds_dir)->
	dd_used_breakdown[DD_USED_SNAP], ==, 0);

	dsl_deadlist_space(&clone->ds_deadlist,
	&cdl_used, &cdl_comp, &cdl_uncomp);
	dsl_deadlist_space(&origin_head->ds_deadlist,
	&odl_used, &odl_comp, &odl_uncomp);

	dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
	cdl_used -
	(dsl_dataset_phys(origin_head)->ds_referenced_bytes +
	odl_used);
	dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
	cdl_comp -
	(dsl_dataset_phys(origin_head)->ds_compressed_bytes +
	odl_comp);
	duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
	cdl_uncomp -
	(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
	odl_uncomp);

	dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
	dused, dcomp, duncomp, tx);
	dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
	-dused, -dcomp, -duncomp, tx);

	/*
	* The difference in the space used by snapshots is the
	* difference in snapshot space due to the head's
	* deadlist (since that's the only thing that's
	* changing that affects the snapused).
	*/
	dsl_deadlist_space_range(&clone->ds_deadlist,
	origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
	&cdl_used, &cdl_comp, &cdl_uncomp);
	dsl_deadlist_space_range(&origin_head->ds_deadlist,
	origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
	&odl_used, &odl_comp, &odl_uncomp);
	dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
	DD_USED_HEAD, DD_USED_SNAP, tx);
	}

	/* swap ds__bytes /
	SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
	dsl_dataset_phys(clone)->ds_referenced_bytes);
	SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
	dsl_dataset_phys(clone)->ds_compressed_bytes);
	SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
	dsl_dataset_phys(clone)->ds_uncompressed_bytes);
	SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
	dsl_dataset_phys(clone)->ds_unique_bytes);

	/* apply any parent delta for change in unconsumed refreservation */
	dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
	unused_refres_delta, 0, 0, tx);

	/*
	* Swap deadlists.
	*/
	dsl_deadlist_close(&clone->ds_deadlist);
	dsl_deadlist_close(&origin_head->ds_deadlist);
	SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
	dsl_dataset_phys(clone)->ds_deadlist_obj);
	dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
	dsl_dataset_phys(clone)->ds_deadlist_obj);
	dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
	dsl_dataset_phys(origin_head)->ds_deadlist_obj);
	dsl_dataset_swap_remap_deadlists(clone, origin_head, tx);

	/*
	* If there is a bookmark at the origin, its "next dataset" is
	* changing, so we need to reset its FBN.
	*/
	dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx);

	dsl_scan_ds_clone_swapped(origin_head, clone, tx);

	/*
	* Destroy any livelists associated with the clone or the origin,
	* since after the swap the corresponding livelists are no longer
	* valid.
	*/
	dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE);
	dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE);

	spa_history_log_internal_ds(clone, "clone swap", tx,
	"parent=%s", origin_head->ds_dir->dd_myname);
	}

	/*
	* Given a pool name and a dataset object number in that pool,
	* return the name of that dataset.
	*/
	int
	dsl_dsobj_to_dsname(char pname, uint64_t obj, char buf)
	{
	dsl_pool_t *dp;
	dsl_dataset_t *ds;
	int error;

	error = dsl_pool_hold(pname, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
	if (error == 0) {
	dsl_dataset_name(ds, buf);
	dsl_dataset_rele(ds, FTAG);
	}
	dsl_pool_rele(dp, FTAG);

	return (error);
	}

	int
	dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
	uint64_t asize, uint64_t inflight, uint64_t used, uint64_t ref_rsrv)
	{
	int error = 0;

	ASSERT3S(asize, >, 0);

	/*
	* *ref_rsrv is the portion of asize that will come from any
	* unconsumed refreservation space.
	*/
	*ref_rsrv = 0;

	mutex_enter(&ds->ds_lock);
	/*
	* Make a space adjustment for reserved bytes.
	*/
	if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
	ASSERT3U(*used, >=,
	ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
	*used -=
	(ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
	*ref_rsrv =
	asize - MIN(asize, parent_delta(ds, asize + inflight));
	}

	if (!check_quota \|\| ds->ds_quota == 0) {
	mutex_exit(&ds->ds_lock);
	return (0);
	}
	/*
	* If they are requesting more space, and our current estimate
	* is over quota, they get to try again unless the actual
	* on-disk is over quota and there are no pending changes (which
	* may free up space for us).
	*/
	if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
	ds->ds_quota) {
	if (inflight > 0 \|\|
	dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
	error = SET_ERROR(ERESTART);
	else
	error = SET_ERROR(EDQUOT);
	}
	mutex_exit(&ds->ds_lock);

	return (error);
	}

	typedef struct dsl_dataset_set_qr_arg {
	const char *ddsqra_name;
	zprop_source_t ddsqra_source;
	uint64_t ddsqra_value;
	} dsl_dataset_set_qr_arg_t;


	/* ARGSUSED */
	static int
	dsl_dataset_set_refquota_check(void arg, dmu_tx_t tx)
	{
	dsl_dataset_set_qr_arg_t *ddsqra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	int error;
	uint64_t newval;

	if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
	return (SET_ERROR(ENOTSUP));

	error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
	if (error != 0)
	return (error);

	if (ds->ds_is_snapshot) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(EINVAL));
	}

	error = dsl_prop_predict(ds->ds_dir,
	zfs_prop_to_name(ZFS_PROP_REFQUOTA),
	ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	if (newval == 0) {
	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes \|\|
	newval < ds->ds_reserved) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(ENOSPC));
	}

	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	static void
	dsl_dataset_set_refquota_sync(void arg, dmu_tx_t tx)
	{
	dsl_dataset_set_qr_arg_t *ddsqra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds = NULL;
	uint64_t newval;

	VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));

	dsl_prop_set_sync_impl(ds,
	zfs_prop_to_name(ZFS_PROP_REFQUOTA),
	ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
	&ddsqra->ddsqra_value, tx);

	VERIFY0(dsl_prop_get_int_ds(ds,
	zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));

	if (ds->ds_quota != newval) {
	dmu_buf_will_dirty(ds->ds_dbuf, tx);
	ds->ds_quota = newval;
	}
	dsl_dataset_rele(ds, FTAG);
	}

	int
	dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
	uint64_t refquota)
	{
	dsl_dataset_set_qr_arg_t ddsqra;

	ddsqra.ddsqra_name = dsname;
	ddsqra.ddsqra_source = source;
	ddsqra.ddsqra_value = refquota;

	return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
	dsl_dataset_set_refquota_sync, &ddsqra, 0,
	ZFS_SPACE_CHECK_EXTRA_RESERVED));
	}

	static int
	dsl_dataset_set_refreservation_check(void arg, dmu_tx_t tx)
	{
	dsl_dataset_set_qr_arg_t *ddsqra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	int error;
	uint64_t newval, unique;

	if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
	return (SET_ERROR(ENOTSUP));

	error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
	if (error != 0)
	return (error);

	if (ds->ds_is_snapshot) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(EINVAL));
	}

	error = dsl_prop_predict(ds->ds_dir,
	zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
	ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	/*
	* If we are doing the preliminary check in open context, the
	* space estimates may be inaccurate.
	*/
	if (!dmu_tx_is_syncing(tx)) {
	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	mutex_enter(&ds->ds_lock);
	if (!DS_UNIQUE_IS_ACCURATE(ds))
	dsl_dataset_recalc_head_uniq(ds);
	unique = dsl_dataset_phys(ds)->ds_unique_bytes;
	mutex_exit(&ds->ds_lock);

	if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
	uint64_t delta = MAX(unique, newval) -
	MAX(unique, ds->ds_reserved);

	if (delta >
	dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) \|\|
	(ds->ds_quota > 0 && newval > ds->ds_quota)) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(ENOSPC));
	}
	}

	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	void
	dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
	zprop_source_t source, uint64_t value, dmu_tx_t *tx)
	{
	uint64_t newval;
	uint64_t unique;
	int64_t delta;

	dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
	source, sizeof (value), 1, &value, tx);

	VERIFY0(dsl_prop_get_int_ds(ds,
	zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));

	dmu_buf_will_dirty(ds->ds_dbuf, tx);
	mutex_enter(&ds->ds_dir->dd_lock);
	mutex_enter(&ds->ds_lock);
	ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
	unique = dsl_dataset_phys(ds)->ds_unique_bytes;
	delta = MAX(0, (int64_t)(newval - unique)) -
	MAX(0, (int64_t)(ds->ds_reserved - unique));
	ds->ds_reserved = newval;
	mutex_exit(&ds->ds_lock);

	dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
	mutex_exit(&ds->ds_dir->dd_lock);
	}

	static void
	dsl_dataset_set_refreservation_sync(void arg, dmu_tx_t tx)
	{
	dsl_dataset_set_qr_arg_t *ddsqra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds = NULL;

	VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
	dsl_dataset_set_refreservation_sync_impl(ds,
	ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
	dsl_dataset_rele(ds, FTAG);
	}

	int
	dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
	uint64_t refreservation)
	{
	dsl_dataset_set_qr_arg_t ddsqra;

	ddsqra.ddsqra_name = dsname;
	ddsqra.ddsqra_source = source;
	ddsqra.ddsqra_value = refreservation;

	return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
	dsl_dataset_set_refreservation_sync, &ddsqra, 0,
	ZFS_SPACE_CHECK_EXTRA_RESERVED));
	}

	typedef struct dsl_dataset_set_compression_arg {
	const char *ddsca_name;
	zprop_source_t ddsca_source;
	uint64_t ddsca_value;
	} dsl_dataset_set_compression_arg_t;

	/* ARGSUSED */
	static int
	dsl_dataset_set_compression_check(void arg, dmu_tx_t tx)
	{
	dsl_dataset_set_compression_arg_t *ddsca = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);

	uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value);
	spa_feature_t f = zio_compress_to_feature(compval);

	if (f == SPA_FEATURE_NONE)
	return (SET_ERROR(EINVAL));

	if (!spa_feature_is_enabled(dp->dp_spa, f))
	return (SET_ERROR(ENOTSUP));

	return (0);
	}

	static void
	dsl_dataset_set_compression_sync(void arg, dmu_tx_t tx)
	{
	dsl_dataset_set_compression_arg_t *ddsca = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds = NULL;

	uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value);
	spa_feature_t f = zio_compress_to_feature(compval);
	ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN);

	VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds));
	if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) {
	ds->ds_feature_activation[f] = (void *)B_TRUE;
	dsl_dataset_activate_feature(ds->ds_object, f,
	ds->ds_feature_activation[f], tx);
	ds->ds_feature[f] = ds->ds_feature_activation[f];
	}
	dsl_dataset_rele(ds, FTAG);
	}

	int
	dsl_dataset_set_compression(const char *dsname, zprop_source_t source,
	uint64_t compression)
	{
	dsl_dataset_set_compression_arg_t ddsca;

	/*
	* The sync task is only required for zstd in order to activate
	* the feature flag when the property is first set.
	*/
	if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD)
	return (0);

	ddsca.ddsca_name = dsname;
	ddsca.ddsca_source = source;
	ddsca.ddsca_value = compression;

	return (dsl_sync_task(dsname, dsl_dataset_set_compression_check,
	dsl_dataset_set_compression_sync, &ddsca, 0,
	ZFS_SPACE_CHECK_EXTRA_RESERVED));
	}

	/*
	* Return (in *usedp) the amount of space referenced by "new" that was not
	* referenced at the time the bookmark corresponds to. "New" may be a
	* snapshot or a head. The bookmark must be before new, in
	* new's filesystem (or its origin) -- caller verifies this.
	*
	* The written space is calculated by considering two components: First, we
	* ignore any freed space, and calculate the written as new's used space
	* minus old's used space. Next, we add in the amount of space that was freed
	* between the two time points, thus reducing new's used space relative to
	* old's. Specifically, this is the space that was born before
	* zbm_creation_txg, and freed before new (ie. on new's deadlist or a
	* previous deadlist).
	*
	* space freed [---------------------]
	* snapshots ---O-------O--------O-------O------
	* bookmark new
	*
	* Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN
	* flag is not set, we will calculate the freed_before_next based on the
	* next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap.
	*/
	static int
	dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp,
	dsl_dataset_t new, uint64_t usedp, uint64_t compp, uint64_t uncompp)
	{
	int err = 0;
	dsl_pool_t *dp = new->ds_dir->dd_pool;

	ASSERT(dsl_pool_config_held(dp));
	if (dsl_dataset_is_snapshot(new)) {
	ASSERT3U(bmp->zbm_creation_txg, <,
	dsl_dataset_phys(new)->ds_creation_txg);
	}

	*usedp = 0;
	*usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
	*usedp -= bmp->zbm_referenced_bytes_refd;

	*compp = 0;
	*compp += dsl_dataset_phys(new)->ds_compressed_bytes;
	*compp -= bmp->zbm_compressed_bytes_refd;

	*uncompp = 0;
	*uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
	*uncompp -= bmp->zbm_uncompressed_bytes_refd;

	dsl_dataset_t *snap = new;

	while (dsl_dataset_phys(snap)->ds_prev_snap_txg >
	bmp->zbm_creation_txg) {
	uint64_t used, comp, uncomp;

	dsl_deadlist_space_range(&snap->ds_deadlist,
	0, bmp->zbm_creation_txg,
	&used, &comp, &uncomp);
	*usedp += used;
	*compp += comp;
	*uncompp += uncomp;

	uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
	if (snap != new)
	dsl_dataset_rele(snap, FTAG);
	err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
	if (err != 0)
	break;
	}

	/*
	* We might not have the FBN if we are calculating written from
	* a snapshot (because we didn't know the correct "next" snapshot
	* until now).
	*/
	if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) {
	*usedp += bmp->zbm_referenced_freed_before_next_snap;
	*compp += bmp->zbm_compressed_freed_before_next_snap;
	*uncompp += bmp->zbm_uncompressed_freed_before_next_snap;
	} else {
	ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==,
	bmp->zbm_creation_txg);
	uint64_t used, comp, uncomp;
	dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp);
	*usedp += used;
	*compp += comp;
	*uncompp += uncomp;
	}
	if (snap != new)
	dsl_dataset_rele(snap, FTAG);
	return (err);
	}

	/*
	* Return (in *usedp) the amount of space written in new that was not
	* present at the time the bookmark corresponds to. New may be a
	* snapshot or the head. Old must be a bookmark before new, in
	* new's filesystem (or its origin) -- caller verifies this.
	*/
	int
	dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp,
	dsl_dataset_t new, uint64_t usedp, uint64_t compp, uint64_t uncompp)
	{
	if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN))
	return (SET_ERROR(ENOTSUP));
	return (dsl_dataset_space_written_impl(bmp, new,
	usedp, compp, uncompp));
	}

	/*
	* Return (in *usedp) the amount of space written in new that is not
	* present in oldsnap. New may be a snapshot or the head. Old must be
	* a snapshot before new, in new's filesystem (or its origin). If not then
	* fail and return EINVAL.
	*/
	int
	dsl_dataset_space_written(dsl_dataset_t oldsnap, dsl_dataset_t new,
	uint64_t usedp, uint64_t compp, uint64_t *uncompp)
	{
	if (!dsl_dataset_is_before(new, oldsnap, 0))
	return (SET_ERROR(EINVAL));

	zfs_bookmark_phys_t zbm = { 0 };
	dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap);
	zbm.zbm_guid = dsp->ds_guid;
	zbm.zbm_creation_txg = dsp->ds_creation_txg;
	zbm.zbm_creation_time = dsp->ds_creation_time;
	zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes;
	zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes;
	zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes;

	/*
	* If oldsnap is the origin (or origin's origin, ...) of new,
	* we can't easily calculate the effective FBN. Therefore,
	* we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate
	* it relative to the correct "next": the next snapshot towards "new",
	* rather than the next snapshot in oldsnap's dsl_dir.
	*/
	return (dsl_dataset_space_written_impl(&zbm, new,
	usedp, compp, uncompp));
	}

	/*
	* Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
	* lastsnap, and all snapshots in between are deleted.
	*
	* blocks that would be freed [---------------------------]
	* snapshots ---O-------O--------O-------O--------O
	* firstsnap lastsnap
	*
	* This is the set of blocks that were born after the snap before firstsnap,
	* (birth > firstsnap->prev_snap_txg) and died before the snap after the
	* last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
	* We calculate this by iterating over the relevant deadlists (from the snap
	* after lastsnap, backward to the snap after firstsnap), summing up the
	* space on the deadlist that was born after the snap before firstsnap.
	*/
	int
	dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
	dsl_dataset_t *lastsnap,
	uint64_t usedp, uint64_t compp, uint64_t *uncompp)
	{
	int err = 0;
	uint64_t snapobj;
	dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;

	ASSERT(firstsnap->ds_is_snapshot);
	ASSERT(lastsnap->ds_is_snapshot);

	/*
	* Check that the snapshots are in the same dsl_dir, and firstsnap
	* is before lastsnap.
	*/
	if (firstsnap->ds_dir != lastsnap->ds_dir \|\|
	dsl_dataset_phys(firstsnap)->ds_creation_txg >
	dsl_dataset_phys(lastsnap)->ds_creation_txg)
	return (SET_ERROR(EINVAL));

	usedp = compp = *uncompp = 0;

	snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
	while (snapobj != firstsnap->ds_object) {
	dsl_dataset_t *ds;
	uint64_t used, comp, uncomp;

	err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
	if (err != 0)
	break;

	dsl_deadlist_space_range(&ds->ds_deadlist,
	dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
	&used, &comp, &uncomp);
	*usedp += used;
	*compp += comp;
	*uncompp += uncomp;

	snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
	ASSERT3U(snapobj, !=, 0);
	dsl_dataset_rele(ds, FTAG);
	}
	return (err);
	}

	/*
	* Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
	* For example, they could both be snapshots of the same filesystem, and
	* 'earlier' is before 'later'. Or 'earlier' could be the origin of
	* 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
	* filesystem. Or 'earlier' could be the origin's origin.
	*
	* If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
	*/
	boolean_t
	dsl_dataset_is_before(dsl_dataset_t later, dsl_dataset_t earlier,
	uint64_t earlier_txg)
	{
	dsl_pool_t *dp = later->ds_dir->dd_pool;
	int error;
	boolean_t ret;

	ASSERT(dsl_pool_config_held(dp));
	ASSERT(earlier->ds_is_snapshot \|\| earlier_txg != 0);

	if (earlier_txg == 0)
	earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;

	if (later->ds_is_snapshot &&
	earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
	return (B_FALSE);

	if (later->ds_dir == earlier->ds_dir)
	return (B_TRUE);

	/*
	* We check dd_origin_obj explicitly here rather than using
	* dsl_dir_is_clone() so that we will return TRUE if "earlier"
	* is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on
	* this behavior.
	*/
	if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0)
	return (B_FALSE);

	dsl_dataset_t *origin;
	error = dsl_dataset_hold_obj(dp,
	dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
	if (error != 0)
	return (B_FALSE);
	if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg &&
	origin->ds_dir == earlier->ds_dir) {
	dsl_dataset_rele(origin, FTAG);
	return (B_TRUE);
	}
	ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
	dsl_dataset_rele(origin, FTAG);
	return (ret);
	}

	void
	dsl_dataset_zapify(dsl_dataset_t ds, dmu_tx_t tx)
	{
	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
	dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
	}

	boolean_t
	dsl_dataset_is_zapified(dsl_dataset_t *ds)
	{
	dmu_object_info_t doi;

	dmu_object_info_from_db(ds->ds_dbuf, &doi);
	return (doi.doi_type == DMU_OTN_ZAP_METADATA);
	}

	boolean_t
	dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
	{
	return (dsl_dataset_is_zapified(ds) &&
	zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
	ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
	}

	uint64_t
	dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds)
	{
	uint64_t remap_deadlist_obj;
	int err;

	if (!dsl_dataset_is_zapified(ds))
	return (0);

	err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object,
	DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1,
	&remap_deadlist_obj);

	if (err != 0) {
	VERIFY3S(err, ==, ENOENT);
	return (0);
	}

	ASSERT(remap_deadlist_obj != 0);
	return (remap_deadlist_obj);
	}

	boolean_t
	dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds)
	{
	EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist),
	dsl_dataset_get_remap_deadlist_object(ds) != 0);
	return (dsl_deadlist_is_open(&ds->ds_remap_deadlist));
	}

	static void
	dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj,
	dmu_tx_t *tx)
	{
	ASSERT(obj != 0);
	dsl_dataset_zapify(ds, tx);
	VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object,
	DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx));
	}

	static void
	dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t ds, dmu_tx_t tx)
	{
	VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset,
	ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx));
	}

	void
	dsl_dataset_destroy_remap_deadlist(dsl_dataset_t ds, dmu_tx_t tx)
	{
	uint64_t remap_deadlist_object;
	spa_t *spa = ds->ds_dir->dd_pool->dp_spa;

	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(dsl_dataset_remap_deadlist_exists(ds));

	remap_deadlist_object = ds->ds_remap_deadlist.dl_object;
	dsl_deadlist_close(&ds->ds_remap_deadlist);
	dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx);
	dsl_dataset_unset_remap_deadlist_object(ds, tx);
	spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
	}

	void
	dsl_dataset_create_remap_deadlist(dsl_dataset_t ds, dmu_tx_t tx)
	{
	uint64_t remap_deadlist_obj;
	spa_t *spa = ds->ds_dir->dd_pool->dp_spa;

	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock));
	/*
	* Currently we only create remap deadlists when there are indirect
	* vdevs with referenced mappings.
	*/
	ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL));

	remap_deadlist_obj = dsl_deadlist_clone(
	&ds->ds_deadlist, UINT64_MAX,
	dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
	dsl_dataset_set_remap_deadlist_object(ds,
	remap_deadlist_obj, tx);
	dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa),
	remap_deadlist_obj);
	spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
	}

	void
	dsl_dataset_activate_redaction(dsl_dataset_t ds, uint64_t redact_snaps,
	uint64_t num_redact_snaps, dmu_tx_t *tx)
	{
	uint64_t dsobj = ds->ds_object;
	struct feature_type_uint64_array_arg *ftuaa =
	kmem_zalloc(sizeof (*ftuaa), KM_SLEEP);
	ftuaa->length = (int64_t)num_redact_snaps;
	if (num_redact_snaps > 0) {
	ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t),
	KM_SLEEP);
	bcopy(redact_snaps, ftuaa->array, num_redact_snaps *
	sizeof (uint64_t));
	}
	dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS,
	ftuaa, tx);
	ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa;
	}

	/* BEGIN CSTYLED */
	#if defined(_LP64)
	#define RECORDSIZE_PERM ZMOD_RW
	#else
	/* Limited to 1M on 32-bit platforms due to lack of virtual address space */
	#define RECORDSIZE_PERM ZMOD_RD
	#endif
	ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, INT, RECORDSIZE_PERM,
	"Max allowed record size");

	ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW,
	"Allow mounting of redacted datasets");
	/* END CSTYLED */

	EXPORT_SYMBOL(dsl_dataset_hold);
	EXPORT_SYMBOL(dsl_dataset_hold_flags);
	EXPORT_SYMBOL(dsl_dataset_hold_obj);
	EXPORT_SYMBOL(dsl_dataset_hold_obj_flags);
	EXPORT_SYMBOL(dsl_dataset_own);
	EXPORT_SYMBOL(dsl_dataset_own_obj);
	EXPORT_SYMBOL(dsl_dataset_name);
	EXPORT_SYMBOL(dsl_dataset_rele);
	EXPORT_SYMBOL(dsl_dataset_rele_flags);
	EXPORT_SYMBOL(dsl_dataset_disown);
	EXPORT_SYMBOL(dsl_dataset_tryown);
	EXPORT_SYMBOL(dsl_dataset_create_sync);
	EXPORT_SYMBOL(dsl_dataset_create_sync_dd);
	EXPORT_SYMBOL(dsl_dataset_snapshot_check);
	EXPORT_SYMBOL(dsl_dataset_snapshot_sync);
	EXPORT_SYMBOL(dsl_dataset_promote);
	EXPORT_SYMBOL(dsl_dataset_user_hold);
	EXPORT_SYMBOL(dsl_dataset_user_release);
	EXPORT_SYMBOL(dsl_dataset_get_holds);
	EXPORT_SYMBOL(dsl_dataset_get_blkptr);
	EXPORT_SYMBOL(dsl_dataset_get_spa);
	EXPORT_SYMBOL(dsl_dataset_modified_since_snap);
	EXPORT_SYMBOL(dsl_dataset_space_written);
	EXPORT_SYMBOL(dsl_dataset_space_wouldfree);
	EXPORT_SYMBOL(dsl_dataset_sync);
	EXPORT_SYMBOL(dsl_dataset_block_born);
	EXPORT_SYMBOL(dsl_dataset_block_kill);
	EXPORT_SYMBOL(dsl_dataset_dirty);
	EXPORT_SYMBOL(dsl_dataset_stats);
	EXPORT_SYMBOL(dsl_dataset_fast_stat);
	EXPORT_SYMBOL(dsl_dataset_space);
	EXPORT_SYMBOL(dsl_dataset_fsid_guid);
	EXPORT_SYMBOL(dsl_dsobj_to_dsname);
	EXPORT_SYMBOL(dsl_dataset_check_quota);
	EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl);
	EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl);
	diff --git a/sys/contrib/openzfs/module/zfs/dsl_dir.c b/sys/contrib/openzfs/module/zfs/dsl_dir.c
	index df2c3d8f0637..84caace4dbab 100644
	--- a/sys/contrib/openzfs/module/zfs/dsl_dir.c
	+++ b/sys/contrib/openzfs/module/zfs/dsl_dir.c
	@@ -1,2404 +1,2450 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2013 Martin Matuska. All rights reserved.
	* Copyright (c) 2014 Joyent, Inc. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	* Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
	*/

	#include <sys/dmu.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_tx.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_synctask.h>
	#include <sys/dsl_deleg.h>
	#include <sys/dmu_impl.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/metaslab.h>
	#include <sys/zap.h>
	#include <sys/zio.h>
	#include <sys/arc.h>
	#include <sys/sunddi.h>
	#include <sys/zfeature.h>
	#include <sys/policy.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/zfs_znode.h>
	#include <sys/zvol.h>
	#include <sys/zthr.h>
	#include "zfs_namecheck.h"
	#include "zfs_prop.h"

	/*
	* Filesystem and Snapshot Limits
	* ------------------------------
	*
	* These limits are used to restrict the number of filesystems and/or snapshots
	* that can be created at a given level in the tree or below. A typical
	* use-case is with a delegated dataset where the administrator wants to ensure
	* that a user within the zone is not creating too many additional filesystems
	* or snapshots, even though they're not exceeding their space quota.
	*
	* The filesystem and snapshot counts are stored as extensible properties. This
	* capability is controlled by a feature flag and must be enabled to be used.
	* Once enabled, the feature is not active until the first limit is set. At
	* that point, future operations to create/destroy filesystems or snapshots
	* will validate and update the counts.
	*
	* Because the count properties will not exist before the feature is active,
	* the counts are updated when a limit is first set on an uninitialized
	* dsl_dir node in the tree (The filesystem/snapshot count on a node includes
	* all of the nested filesystems/snapshots. Thus, a new leaf node has a
	* filesystem count of 0 and a snapshot count of 0. Non-existent filesystem and
	* snapshot count properties on a node indicate uninitialized counts on that
	* node.) When first setting a limit on an uninitialized node, the code starts
	* at the filesystem with the new limit and descends into all sub-filesystems
	* to add the count properties.
	*
	* In practice this is lightweight since a limit is typically set when the
	* filesystem is created and thus has no children. Once valid, changing the
	* limit value won't require a re-traversal since the counts are already valid.
	* When recursively fixing the counts, if a node with a limit is encountered
	* during the descent, the counts are known to be valid and there is no need to
	* descend into that filesystem's children. The counts on filesystems above the
	* one with the new limit will still be uninitialized, unless a limit is
	* eventually set on one of those filesystems. The counts are always recursively
	* updated when a limit is set on a dataset, unless there is already a limit.
	* When a new limit value is set on a filesystem with an existing limit, it is
	* possible for the new limit to be less than the current count at that level
	* since a user who can change the limit is also allowed to exceed the limit.
	*
	* Once the feature is active, then whenever a filesystem or snapshot is
	* created, the code recurses up the tree, validating the new count against the
	* limit at each initialized level. In practice, most levels will not have a
	* limit set. If there is a limit at any initialized level up the tree, the
	* check must pass or the creation will fail. Likewise, when a filesystem or
	* snapshot is destroyed, the counts are recursively adjusted all the way up
	* the initialized nodes in the tree. Renaming a filesystem into different point
	* in the tree will first validate, then update the counts on each branch up to
	* the common ancestor. A receive will also validate the counts and then update
	* them.
	*
	* An exception to the above behavior is that the limit is not enforced if the
	* user has permission to modify the limit. This is primarily so that
	* recursive snapshots in the global zone always work. We want to prevent a
	* denial-of-service in which a lower level delegated dataset could max out its
	* limit and thus block recursive snapshots from being taken in the global zone.
	* Because of this, it is possible for the snapshot count to be over the limit
	* and snapshots taken in the global zone could cause a lower level dataset to
	* hit or exceed its limit. The administrator taking the global zone recursive
	* snapshot should be aware of this side-effect and behave accordingly.
	* For consistency, the filesystem limit is also not enforced if the user can
	* modify the limit.
	*
	* The filesystem and snapshot limits are validated by dsl_fs_ss_limit_check()
	* and updated by dsl_fs_ss_count_adjust(). A new limit value is setup in
	* dsl_dir_activate_fs_ss_limit() and the counts are adjusted, if necessary, by
	* dsl_dir_init_fs_ss_count().
	*/

	extern inline dsl_dir_phys_t dsl_dir_phys(dsl_dir_t dd);

	static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd);

	typedef struct ddulrt_arg {
	dsl_dir_t *ddulrta_dd;
	uint64_t ddlrta_txg;
	} ddulrt_arg_t;

	static void
	dsl_dir_evict_async(void *dbu)
	{
	dsl_dir_t *dd = dbu;
	int t;
	dsl_pool_t *dp __maybe_unused = dd->dd_pool;

	dd->dd_dbuf = NULL;

	for (t = 0; t < TXG_SIZE; t++) {
	ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t));
	ASSERT(dd->dd_tempreserved[t] == 0);
	ASSERT(dd->dd_space_towrite[t] == 0);
	}

	if (dd->dd_parent)
	dsl_dir_async_rele(dd->dd_parent, dd);

	spa_async_close(dd->dd_pool->dp_spa, dd);

	if (dsl_deadlist_is_open(&dd->dd_livelist))
	dsl_dir_livelist_close(dd);

	dsl_prop_fini(dd);
	cv_destroy(&dd->dd_activity_cv);
	mutex_destroy(&dd->dd_activity_lock);
	mutex_destroy(&dd->dd_lock);
	kmem_free(dd, sizeof (dsl_dir_t));
	}

	int
	dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
	const char tail, void tag, dsl_dir_t **ddp)
	{
	dmu_buf_t *dbuf;
	dsl_dir_t *dd;
	dmu_object_info_t doi;
	int err;

	ASSERT(dsl_pool_config_held(dp));

	err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf);
	if (err != 0)
	return (err);
	dd = dmu_buf_get_user(dbuf);

	dmu_object_info_from_db(dbuf, &doi);
	ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_DSL_DIR);
	ASSERT3U(doi.doi_bonus_size, >=, sizeof (dsl_dir_phys_t));

	if (dd == NULL) {
	dsl_dir_t *winner;

	dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP);
	dd->dd_object = ddobj;
	dd->dd_dbuf = dbuf;
	dd->dd_pool = dp;

	mutex_init(&dd->dd_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&dd->dd_activity_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&dd->dd_activity_cv, NULL, CV_DEFAULT, NULL);
	dsl_prop_init(dd);

	if (dsl_dir_is_zapified(dd)) {
	err = zap_lookup(dp->dp_meta_objset,
	ddobj, DD_FIELD_CRYPTO_KEY_OBJ,
	sizeof (uint64_t), 1, &dd->dd_crypto_obj);
	if (err == 0) {
	/* check for on-disk format errata */
	if (dsl_dir_incompatible_encryption_version(
	dd)) {
	dp->dp_spa->spa_errata =
	ZPOOL_ERRATA_ZOL_6845_ENCRYPTION;
	}
	} else if (err != ENOENT) {
	goto errout;
	}
	}

	dsl_dir_snap_cmtime_update(dd);

	if (dsl_dir_phys(dd)->dd_parent_obj) {
	err = dsl_dir_hold_obj(dp,
	dsl_dir_phys(dd)->dd_parent_obj, NULL, dd,
	&dd->dd_parent);
	if (err != 0)
	goto errout;
	if (tail) {
	#ifdef ZFS_DEBUG
	uint64_t foundobj;

	err = zap_lookup(dp->dp_meta_objset,
	dsl_dir_phys(dd->dd_parent)->
	dd_child_dir_zapobj, tail,
	sizeof (foundobj), 1, &foundobj);
	ASSERT(err \|\| foundobj == ddobj);
	#endif
	(void) strlcpy(dd->dd_myname, tail,
	sizeof (dd->dd_myname));
	} else {
	err = zap_value_search(dp->dp_meta_objset,
	dsl_dir_phys(dd->dd_parent)->
	dd_child_dir_zapobj,
	ddobj, 0, dd->dd_myname);
	}
	if (err != 0)
	goto errout;
	} else {
	(void) strlcpy(dd->dd_myname, spa_name(dp->dp_spa),
	sizeof (dd->dd_myname));
	}

	if (dsl_dir_is_clone(dd)) {
	dmu_buf_t *origin_bonus;
	dsl_dataset_phys_t *origin_phys;

	/*
	* We can't open the origin dataset, because
	* that would require opening this dsl_dir.
	* Just look at its phys directly instead.
	*/
	err = dmu_bonus_hold(dp->dp_meta_objset,
	dsl_dir_phys(dd)->dd_origin_obj, FTAG,
	&origin_bonus);
	if (err != 0)
	goto errout;
	origin_phys = origin_bonus->db_data;
	dd->dd_origin_txg =
	origin_phys->ds_creation_txg;
	dmu_buf_rele(origin_bonus, FTAG);
	if (dsl_dir_is_zapified(dd)) {
	uint64_t obj;
	err = zap_lookup(dp->dp_meta_objset,
	dd->dd_object, DD_FIELD_LIVELIST,
	sizeof (uint64_t), 1, &obj);
	if (err == 0)
	dsl_dir_livelist_open(dd, obj);
	else if (err != ENOENT)
	goto errout;
	}
	}

	dmu_buf_init_user(&dd->dd_dbu, NULL, dsl_dir_evict_async,
	&dd->dd_dbuf);
	winner = dmu_buf_set_user_ie(dbuf, &dd->dd_dbu);
	if (winner != NULL) {
	if (dd->dd_parent)
	dsl_dir_rele(dd->dd_parent, dd);
	if (dsl_deadlist_is_open(&dd->dd_livelist))
	dsl_dir_livelist_close(dd);
	dsl_prop_fini(dd);
	cv_destroy(&dd->dd_activity_cv);
	mutex_destroy(&dd->dd_activity_lock);
	mutex_destroy(&dd->dd_lock);
	kmem_free(dd, sizeof (dsl_dir_t));
	dd = winner;
	} else {
	spa_open_ref(dp->dp_spa, dd);
	}
	}

	/*
	* The dsl_dir_t has both open-to-close and instantiate-to-evict
	* holds on the spa. We need the open-to-close holds because
	* otherwise the spa_refcnt wouldn't change when we open a
	* dir which the spa also has open, so we could incorrectly
	* think it was OK to unload/export/destroy the pool. We need
	* the instantiate-to-evict hold because the dsl_dir_t has a
	* pointer to the dd_pool, which has a pointer to the spa_t.
	*/
	spa_open_ref(dp->dp_spa, tag);
	ASSERT3P(dd->dd_pool, ==, dp);
	ASSERT3U(dd->dd_object, ==, ddobj);
	ASSERT3P(dd->dd_dbuf, ==, dbuf);
	*ddp = dd;
	return (0);

	errout:
	if (dd->dd_parent)
	dsl_dir_rele(dd->dd_parent, dd);
	if (dsl_deadlist_is_open(&dd->dd_livelist))
	dsl_dir_livelist_close(dd);
	dsl_prop_fini(dd);
	cv_destroy(&dd->dd_activity_cv);
	mutex_destroy(&dd->dd_activity_lock);
	mutex_destroy(&dd->dd_lock);
	kmem_free(dd, sizeof (dsl_dir_t));
	dmu_buf_rele(dbuf, tag);
	return (err);
	}

	void
	dsl_dir_rele(dsl_dir_t dd, void tag)
	{
	dprintf_dd(dd, "%s\n", "");
	spa_close(dd->dd_pool->dp_spa, tag);
	dmu_buf_rele(dd->dd_dbuf, tag);
	}

	/*
	* Remove a reference to the given dsl dir that is being asynchronously
	* released. Async releases occur from a taskq performing eviction of
	* dsl datasets and dirs. This process is identical to a normal release
	* with the exception of using the async API for releasing the reference on
	* the spa.
	*/
	void
	dsl_dir_async_rele(dsl_dir_t dd, void tag)
	{
	dprintf_dd(dd, "%s\n", "");
	spa_async_close(dd->dd_pool->dp_spa, tag);
	dmu_buf_rele(dd->dd_dbuf, tag);
	}

	/* buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes */
	void
	dsl_dir_name(dsl_dir_t dd, char buf)
	{
	if (dd->dd_parent) {
	dsl_dir_name(dd->dd_parent, buf);
	VERIFY3U(strlcat(buf, "/", ZFS_MAX_DATASET_NAME_LEN), <,
	ZFS_MAX_DATASET_NAME_LEN);
	} else {
	buf[0] = '\0';
	}
	if (!MUTEX_HELD(&dd->dd_lock)) {
	/*
	* recursive mutex so that we can use
	* dprintf_dd() with dd_lock held
	*/
	mutex_enter(&dd->dd_lock);
	VERIFY3U(strlcat(buf, dd->dd_myname, ZFS_MAX_DATASET_NAME_LEN),
	<, ZFS_MAX_DATASET_NAME_LEN);
	mutex_exit(&dd->dd_lock);
	} else {
	VERIFY3U(strlcat(buf, dd->dd_myname, ZFS_MAX_DATASET_NAME_LEN),
	<, ZFS_MAX_DATASET_NAME_LEN);
	}
	}

	/* Calculate name length, avoiding all the strcat calls of dsl_dir_name */
	int
	dsl_dir_namelen(dsl_dir_t *dd)
	{
	int result = 0;

	if (dd->dd_parent) {
	/* parent's name + 1 for the "/" */
	result = dsl_dir_namelen(dd->dd_parent) + 1;
	}

	if (!MUTEX_HELD(&dd->dd_lock)) {
	/* see dsl_dir_name */
	mutex_enter(&dd->dd_lock);
	result += strlen(dd->dd_myname);
	mutex_exit(&dd->dd_lock);
	} else {
	result += strlen(dd->dd_myname);
	}

	return (result);
	}

	static int
	getcomponent(const char path, char component, const char **nextp)
	{
	char *p;

	if ((path == NULL) \|\| (path[0] == '\0'))
	return (SET_ERROR(ENOENT));
	/* This would be a good place to reserve some namespace... */
	p = strpbrk(path, "/@");
	if (p && (p[1] == '/' \|\| p[1] == '@')) {
	/* two separators in a row */
	return (SET_ERROR(EINVAL));
	}
	if (p == NULL \|\| p == path) {
	/*
	* if the first thing is an @ or /, it had better be an
	* @ and it had better not have any more ats or slashes,
	* and it had better have something after the @.
	*/
	if (p != NULL &&
	(p[0] != '@' \|\| strpbrk(path+1, "/@") \|\| p[1] == '\0'))
	return (SET_ERROR(EINVAL));
	if (strlen(path) >= ZFS_MAX_DATASET_NAME_LEN)
	return (SET_ERROR(ENAMETOOLONG));
	(void) strlcpy(component, path, ZFS_MAX_DATASET_NAME_LEN);
	p = NULL;
	} else if (p[0] == '/') {
	if (p - path >= ZFS_MAX_DATASET_NAME_LEN)
	return (SET_ERROR(ENAMETOOLONG));
	(void) strncpy(component, path, p - path);
	component[p - path] = '\0';
	p++;
	} else if (p[0] == '@') {
	/*
	* if the next separator is an @, there better not be
	* any more slashes.
	*/
	if (strchr(path, '/'))
	return (SET_ERROR(EINVAL));
	if (p - path >= ZFS_MAX_DATASET_NAME_LEN)
	return (SET_ERROR(ENAMETOOLONG));
	(void) strncpy(component, path, p - path);
	component[p - path] = '\0';
	} else {
	panic("invalid p=%p", (void *)p);
	}
	*nextp = p;
	return (0);
	}

	/*
	* Return the dsl_dir_t, and possibly the last component which couldn't
	* be found in *tail. The name must be in the specified dsl_pool_t. This
	* thread must hold the dp_config_rwlock for the pool. Returns NULL if the
	* path is bogus, or if tail==NULL and we couldn't parse the whole name.
	* (*tail)[0] == '@' means that the last component is a snapshot.
	*/
	int
	dsl_dir_hold(dsl_pool_t dp, const char name, void *tag,
	dsl_dir_t ddp, const char tailp)
	{
	char *buf;
	const char spaname, next, *nextnext = NULL;
	int err;
	dsl_dir_t *dd;
	uint64_t ddobj;

	buf = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
	err = getcomponent(name, buf, &next);
	if (err != 0)
	goto error;

	/* Make sure the name is in the specified pool. */
	spaname = spa_name(dp->dp_spa);
	if (strcmp(buf, spaname) != 0) {
	err = SET_ERROR(EXDEV);
	goto error;
	}

	ASSERT(dsl_pool_config_held(dp));

	err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd);
	if (err != 0) {
	goto error;
	}

	while (next != NULL) {
	dsl_dir_t *child_dd;
	err = getcomponent(next, buf, &nextnext);
	if (err != 0)
	break;
	ASSERT(next[0] != '\0');
	if (next[0] == '@')
	break;
	dprintf("looking up %s in obj%lld\n",
	buf, (longlong_t)dsl_dir_phys(dd)->dd_child_dir_zapobj);

	err = zap_lookup(dp->dp_meta_objset,
	dsl_dir_phys(dd)->dd_child_dir_zapobj,
	buf, sizeof (ddobj), 1, &ddobj);
	if (err != 0) {
	if (err == ENOENT)
	err = 0;
	break;
	}

	err = dsl_dir_hold_obj(dp, ddobj, buf, tag, &child_dd);
	if (err != 0)
	break;
	dsl_dir_rele(dd, tag);
	dd = child_dd;
	next = nextnext;
	}

	if (err != 0) {
	dsl_dir_rele(dd, tag);
	goto error;
	}

	/*
	* It's an error if there's more than one component left, or
	* tailp==NULL and there's any component left.
	*/
	if (next != NULL &&
	(tailp == NULL \|\| (nextnext && nextnext[0] != '\0'))) {
	/* bad path name */
	dsl_dir_rele(dd, tag);
	dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp);
	err = SET_ERROR(ENOENT);
	}
	if (tailp != NULL)
	*tailp = next;
	if (err == 0)
	*ddp = dd;
	error:
	kmem_free(buf, ZFS_MAX_DATASET_NAME_LEN);
	return (err);
	}

	/*
	* If the counts are already initialized for this filesystem and its
	* descendants then do nothing, otherwise initialize the counts.
	*
	* The counts on this filesystem, and those below, may be uninitialized due to
	* either the use of a pre-existing pool which did not support the
	* filesystem/snapshot limit feature, or one in which the feature had not yet
	* been enabled.
	*
	* Recursively descend the filesystem tree and update the filesystem/snapshot
	* counts on each filesystem below, then update the cumulative count on the
	* current filesystem. If the filesystem already has a count set on it,
	* then we know that its counts, and the counts on the filesystems below it,
	* are already correct, so we don't have to update this filesystem.
	*/
	static void
	dsl_dir_init_fs_ss_count(dsl_dir_t dd, dmu_tx_t tx)
	{
	uint64_t my_fs_cnt = 0;
	uint64_t my_ss_cnt = 0;
	dsl_pool_t *dp = dd->dd_pool;
	objset_t *os = dp->dp_meta_objset;
	zap_cursor_t *zc;
	zap_attribute_t *za;
	dsl_dataset_t *ds;

	ASSERT(spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT));
	ASSERT(dsl_pool_config_held(dp));
	ASSERT(dmu_tx_is_syncing(tx));

	dsl_dir_zapify(dd, tx);

	/*
	* If the filesystem count has already been initialized then we
	* don't need to recurse down any further.
	*/
	if (zap_contains(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT) == 0)
	return;

	zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
	za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);

	/* Iterate my child dirs */
	for (zap_cursor_init(zc, os, dsl_dir_phys(dd)->dd_child_dir_zapobj);
	zap_cursor_retrieve(zc, za) == 0; zap_cursor_advance(zc)) {
	dsl_dir_t *chld_dd;
	uint64_t count;

	VERIFY0(dsl_dir_hold_obj(dp, za->za_first_integer, NULL, FTAG,
	&chld_dd));

	/*
	* Ignore hidden ($FREE, $MOS & $ORIGIN) objsets.
	*/
	if (chld_dd->dd_myname[0] == '$') {
	dsl_dir_rele(chld_dd, FTAG);
	continue;
	}

	my_fs_cnt++; /* count this child */

	dsl_dir_init_fs_ss_count(chld_dd, tx);

	VERIFY0(zap_lookup(os, chld_dd->dd_object,
	DD_FIELD_FILESYSTEM_COUNT, sizeof (count), 1, &count));
	my_fs_cnt += count;
	VERIFY0(zap_lookup(os, chld_dd->dd_object,
	DD_FIELD_SNAPSHOT_COUNT, sizeof (count), 1, &count));
	my_ss_cnt += count;

	dsl_dir_rele(chld_dd, FTAG);
	}
	zap_cursor_fini(zc);
	/* Count my snapshots (we counted children's snapshots above) */
	VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
	dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds));

	for (zap_cursor_init(zc, os, dsl_dataset_phys(ds)->ds_snapnames_zapobj);
	zap_cursor_retrieve(zc, za) == 0;
	zap_cursor_advance(zc)) {
	/* Don't count temporary snapshots */
	if (za->za_name[0] != '%')
	my_ss_cnt++;
	}
	zap_cursor_fini(zc);

	dsl_dataset_rele(ds, FTAG);

	kmem_free(zc, sizeof (zap_cursor_t));
	kmem_free(za, sizeof (zap_attribute_t));

	/* we're in a sync task, update counts */
	dmu_buf_will_dirty(dd->dd_dbuf, tx);
	VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
	sizeof (my_fs_cnt), 1, &my_fs_cnt, tx));
	VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
	sizeof (my_ss_cnt), 1, &my_ss_cnt, tx));
	}

	static int
	dsl_dir_actv_fs_ss_limit_check(void arg, dmu_tx_t tx)
	{
	char ddname = (char )arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	dsl_dir_t *dd;
	int error;

	error = dsl_dataset_hold(dp, ddname, FTAG, &ds);
	if (error != 0)
	return (error);

	if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(ENOTSUP));
	}

	dd = ds->ds_dir;
	if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT) &&
	dsl_dir_is_zapified(dd) &&
	zap_contains(dp->dp_meta_objset, dd->dd_object,
	DD_FIELD_FILESYSTEM_COUNT) == 0) {
	dsl_dataset_rele(ds, FTAG);
	return (SET_ERROR(EALREADY));
	}

	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	static void
	dsl_dir_actv_fs_ss_limit_sync(void arg, dmu_tx_t tx)
	{
	char ddname = (char )arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	spa_t *spa;

	VERIFY0(dsl_dataset_hold(dp, ddname, FTAG, &ds));

	spa = dsl_dataset_get_spa(ds);

	if (!spa_feature_is_active(spa, SPA_FEATURE_FS_SS_LIMIT)) {
	/*
	* Since the feature was not active and we're now setting a
	* limit, increment the feature-active counter so that the
	* feature becomes active for the first time.
	*
	* We are already in a sync task so we can update the MOS.
	*/
	spa_feature_incr(spa, SPA_FEATURE_FS_SS_LIMIT, tx);
	}

	/*
	* Since we are now setting a non-UINT64_MAX limit on the filesystem,
	* we need to ensure the counts are correct. Descend down the tree from
	* this point and update all of the counts to be accurate.
	*/
	dsl_dir_init_fs_ss_count(ds->ds_dir, tx);

	dsl_dataset_rele(ds, FTAG);
	}

	/*
	* Make sure the feature is enabled and activate it if necessary.
	* Since we're setting a limit, ensure the on-disk counts are valid.
	* This is only called by the ioctl path when setting a limit value.
	*
	* We do not need to validate the new limit, since users who can change the
	* limit are also allowed to exceed the limit.
	*/
	int
	dsl_dir_activate_fs_ss_limit(const char *ddname)
	{
	int error;

	error = dsl_sync_task(ddname, dsl_dir_actv_fs_ss_limit_check,
	dsl_dir_actv_fs_ss_limit_sync, (void *)ddname, 0,
	ZFS_SPACE_CHECK_RESERVED);

	if (error == EALREADY)
	error = 0;

	return (error);
	}

	/*
	* Used to determine if the filesystem_limit or snapshot_limit should be
	* enforced. We allow the limit to be exceeded if the user has permission to
	* write the property value. We pass in the creds that we got in the open
	* context since we will always be the GZ root in syncing context. We also have
	* to handle the case where we are allowed to change the limit on the current
	* dataset, but there may be another limit in the tree above.
	*
	* We can never modify these two properties within a non-global zone. In
	* addition, the other checks are modeled on zfs_secpolicy_write_perms. We
	* can't use that function since we are already holding the dp_config_rwlock.
	* In addition, we already have the dd and dealing with snapshots is simplified
	* in this code.
	*/

	typedef enum {
	ENFORCE_ALWAYS,
	ENFORCE_NEVER,
	ENFORCE_ABOVE
	} enforce_res_t;

	static enforce_res_t
	dsl_enforce_ds_ss_limits(dsl_dir_t *dd, zfs_prop_t prop,
	cred_t cr, proc_t proc)
	{
	enforce_res_t enforce = ENFORCE_ALWAYS;
	uint64_t obj;
	dsl_dataset_t *ds;
	uint64_t zoned;
	const char *zonedstr;

	ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT \|\|
	prop == ZFS_PROP_SNAPSHOT_LIMIT);

	#ifdef _KERNEL
	if (crgetzoneid(cr) != GLOBAL_ZONEID)
	return (ENFORCE_ALWAYS);

	/*
	* We are checking the saved credentials of the user process, which is
	* not the current process. Note that we can't use secpolicy_zfs(),
	* because it only works if the cred is that of the current process (on
	* Linux).
	*/
	if (secpolicy_zfs_proc(cr, proc) == 0)
	return (ENFORCE_NEVER);
	#endif

	if ((obj = dsl_dir_phys(dd)->dd_head_dataset_obj) == 0)
	return (ENFORCE_ALWAYS);

	ASSERT(dsl_pool_config_held(dd->dd_pool));

	if (dsl_dataset_hold_obj(dd->dd_pool, obj, FTAG, &ds) != 0)
	return (ENFORCE_ALWAYS);

	zonedstr = zfs_prop_to_name(ZFS_PROP_ZONED);
	if (dsl_prop_get_ds(ds, zonedstr, 8, 1, &zoned, NULL) \|\| zoned) {
	/* Only root can access zoned fs's from the GZ */
	enforce = ENFORCE_ALWAYS;
	} else {
	if (dsl_deleg_access_impl(ds, zfs_prop_to_name(prop), cr) == 0)
	enforce = ENFORCE_ABOVE;
	}

	dsl_dataset_rele(ds, FTAG);
	return (enforce);
	}

	/*
	* Check if adding additional child filesystem(s) would exceed any filesystem
	* limits or adding additional snapshot(s) would exceed any snapshot limits.
	* The prop argument indicates which limit to check.
	*
	* Note that all filesystem limits up to the root (or the highest
	* initialized) filesystem or the given ancestor must be satisfied.
	*/
	int
	dsl_fs_ss_limit_check(dsl_dir_t *dd, uint64_t delta, zfs_prop_t prop,
	dsl_dir_t ancestor, cred_t cr, proc_t *proc)
	{
	objset_t *os = dd->dd_pool->dp_meta_objset;
	uint64_t limit, count;
	char *count_prop;
	enforce_res_t enforce;
	int err = 0;

	ASSERT(dsl_pool_config_held(dd->dd_pool));
	ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT \|\|
	prop == ZFS_PROP_SNAPSHOT_LIMIT);

	/*
	* If we're allowed to change the limit, don't enforce the limit
	* e.g. this can happen if a snapshot is taken by an administrative
	* user in the global zone (i.e. a recursive snapshot by root).
	* However, we must handle the case of delegated permissions where we
	* are allowed to change the limit on the current dataset, but there
	* is another limit in the tree above.
	*/
	enforce = dsl_enforce_ds_ss_limits(dd, prop, cr, proc);
	if (enforce == ENFORCE_NEVER)
	return (0);

	/*
	* e.g. if renaming a dataset with no snapshots, count adjustment
	* is 0.
	*/
	if (delta == 0)
	return (0);

	if (prop == ZFS_PROP_SNAPSHOT_LIMIT) {
	/*
	* We don't enforce the limit for temporary snapshots. This is
	* indicated by a NULL cred_t argument.
	*/
	if (cr == NULL)
	return (0);

	count_prop = DD_FIELD_SNAPSHOT_COUNT;
	} else {
	count_prop = DD_FIELD_FILESYSTEM_COUNT;
	}

	/*
	* If an ancestor has been provided, stop checking the limit once we
	* hit that dir. We need this during rename so that we don't overcount
	* the check once we recurse up to the common ancestor.
	*/
	if (ancestor == dd)
	return (0);

	/*
	* If we hit an uninitialized node while recursing up the tree, we can
	* stop since we know there is no limit here (or above). The counts are
	* not valid on this node and we know we won't touch this node's counts.
	*/
	if (!dsl_dir_is_zapified(dd))
	return (0);
	err = zap_lookup(os, dd->dd_object,
	count_prop, sizeof (count), 1, &count);
	if (err == ENOENT)
	return (0);
	if (err != 0)
	return (err);

	err = dsl_prop_get_dd(dd, zfs_prop_to_name(prop), 8, 1, &limit, NULL,
	B_FALSE);
	if (err != 0)
	return (err);

	/* Is there a limit which we've hit? */
	if (enforce == ENFORCE_ALWAYS && (count + delta) > limit)
	return (SET_ERROR(EDQUOT));

	if (dd->dd_parent != NULL)
	err = dsl_fs_ss_limit_check(dd->dd_parent, delta, prop,
	ancestor, cr, proc);

	return (err);
	}

	/*
	* Adjust the filesystem or snapshot count for the specified dsl_dir_t and all
	* parents. When a new filesystem/snapshot is created, increment the count on
	* all parents, and when a filesystem/snapshot is destroyed, decrement the
	* count.
	*/
	void
	dsl_fs_ss_count_adjust(dsl_dir_t dd, int64_t delta, const char prop,
	dmu_tx_t *tx)
	{
	int err;
	objset_t *os = dd->dd_pool->dp_meta_objset;
	uint64_t count;

	ASSERT(dsl_pool_config_held(dd->dd_pool));
	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0 \|\|
	strcmp(prop, DD_FIELD_SNAPSHOT_COUNT) == 0);

	/*
	* We don't do accounting for hidden ($FREE, $MOS & $ORIGIN) objsets.
	*/
	if (dd->dd_myname[0] == '$' && strcmp(prop,
	DD_FIELD_FILESYSTEM_COUNT) == 0) {
	return;
	}

	/*
	* e.g. if renaming a dataset with no snapshots, count adjustment is 0
	*/
	if (delta == 0)
	return;

	/*
	* If we hit an uninitialized node while recursing up the tree, we can
	* stop since we know the counts are not valid on this node and we
	* know we shouldn't touch this node's counts. An uninitialized count
	* on the node indicates that either the feature has not yet been
	* activated or there are no limits on this part of the tree.
	*/
	if (!dsl_dir_is_zapified(dd) \|\| (err = zap_lookup(os, dd->dd_object,
	prop, sizeof (count), 1, &count)) == ENOENT)
	return;
	VERIFY0(err);

	count += delta;
	/* Use a signed verify to make sure we're not neg. */
	VERIFY3S(count, >=, 0);

	VERIFY0(zap_update(os, dd->dd_object, prop, sizeof (count), 1, &count,
	tx));

	/* Roll up this additional count into our ancestors */
	if (dd->dd_parent != NULL)
	dsl_fs_ss_count_adjust(dd->dd_parent, delta, prop, tx);
	}

	uint64_t
	dsl_dir_create_sync(dsl_pool_t dp, dsl_dir_t pds, const char *name,
	dmu_tx_t *tx)
	{
	objset_t *mos = dp->dp_meta_objset;
	uint64_t ddobj;
	dsl_dir_phys_t *ddphys;
	dmu_buf_t *dbuf;

	ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
	DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
	if (pds) {
	VERIFY0(zap_add(mos, dsl_dir_phys(pds)->dd_child_dir_zapobj,
	name, sizeof (uint64_t), 1, &ddobj, tx));
	} else {
	/* it's the root dir */
	VERIFY0(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx));
	}
	VERIFY0(dmu_bonus_hold(mos, ddobj, FTAG, &dbuf));
	dmu_buf_will_dirty(dbuf, tx);
	ddphys = dbuf->db_data;

	ddphys->dd_creation_time = gethrestime_sec();
	if (pds) {
	ddphys->dd_parent_obj = pds->dd_object;

	/* update the filesystem counts */
	dsl_fs_ss_count_adjust(pds, 1, DD_FIELD_FILESYSTEM_COUNT, tx);
	}
	ddphys->dd_props_zapobj = zap_create(mos,
	DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
	ddphys->dd_child_dir_zapobj = zap_create(mos,
	DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
	if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN)
	ddphys->dd_flags \|= DD_FLAG_USED_BREAKDOWN;

	dmu_buf_rele(dbuf, FTAG);

	return (ddobj);
	}

	boolean_t
	dsl_dir_is_clone(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_origin_obj &&
	(dd->dd_pool->dp_origin_snap == NULL \|\|
	dsl_dir_phys(dd)->dd_origin_obj !=
	dd->dd_pool->dp_origin_snap->ds_object));
	}

	uint64_t
	dsl_dir_get_used(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_used_bytes);
	}

	uint64_t
	dsl_dir_get_compressed(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_compressed_bytes);
	}

	uint64_t
	dsl_dir_get_quota(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_quota);
	}

	uint64_t
	dsl_dir_get_reservation(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_reserved);
	}

	uint64_t
	dsl_dir_get_compressratio(dsl_dir_t *dd)
	{
	/* a fixed point number, 100x the ratio */
	return (dsl_dir_phys(dd)->dd_compressed_bytes == 0 ? 100 :
	(dsl_dir_phys(dd)->dd_uncompressed_bytes * 100 /
	dsl_dir_phys(dd)->dd_compressed_bytes));
	}

	uint64_t
	dsl_dir_get_logicalused(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_uncompressed_bytes);
	}

	uint64_t
	dsl_dir_get_usedsnap(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]);
	}

	uint64_t
	dsl_dir_get_usedds(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_HEAD]);
	}

	uint64_t
	dsl_dir_get_usedrefreserv(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_REFRSRV]);
	}

	uint64_t
	dsl_dir_get_usedchild(dsl_dir_t *dd)
	{
	return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD] +
	dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD_RSRV]);
	}

	void
	dsl_dir_get_origin(dsl_dir_t dd, char buf)
	{
	dsl_dataset_t *ds;
	VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
	dsl_dir_phys(dd)->dd_origin_obj, FTAG, &ds));

	dsl_dataset_name(ds, buf);

	dsl_dataset_rele(ds, FTAG);
	}

	int
	dsl_dir_get_filesystem_count(dsl_dir_t dd, uint64_t count)
	{
	if (dsl_dir_is_zapified(dd)) {
	objset_t *os = dd->dd_pool->dp_meta_objset;
	return (zap_lookup(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
	sizeof (*count), 1, count));
	} else {
	return (SET_ERROR(ENOENT));
	}
	}

	int
	dsl_dir_get_snapshot_count(dsl_dir_t dd, uint64_t count)
	{
	if (dsl_dir_is_zapified(dd)) {
	objset_t *os = dd->dd_pool->dp_meta_objset;
	return (zap_lookup(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
	sizeof (*count), 1, count));
	} else {
	return (SET_ERROR(ENOENT));
	}
	}

	void
	dsl_dir_stats(dsl_dir_t dd, nvlist_t nv)
	{
	mutex_enter(&dd->dd_lock);
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA,
	dsl_dir_get_quota(dd));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION,
	dsl_dir_get_reservation(dd));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALUSED,
	dsl_dir_get_logicalused(dd));
	if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP,
	dsl_dir_get_usedsnap(dd));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS,
	dsl_dir_get_usedds(dd));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV,
	dsl_dir_get_usedrefreserv(dd));
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD,
	dsl_dir_get_usedchild(dd));
	}
	mutex_exit(&dd->dd_lock);

	uint64_t count;
	if (dsl_dir_get_filesystem_count(dd, &count) == 0) {
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_FILESYSTEM_COUNT,
	count);
	}
	if (dsl_dir_get_snapshot_count(dd, &count) == 0) {
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOT_COUNT,
	count);
	}

	if (dsl_dir_is_clone(dd)) {
	char buf[ZFS_MAX_DATASET_NAME_LEN];
	dsl_dir_get_origin(dd, buf);
	dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf);
	}

	}

	void
	dsl_dir_dirty(dsl_dir_t dd, dmu_tx_t tx)
	{
	dsl_pool_t *dp = dd->dd_pool;

	ASSERT(dsl_dir_phys(dd));

	if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg)) {
	/* up the hold count until we can be written out */
	dmu_buf_add_ref(dd->dd_dbuf, dd);
	}
	}

	static int64_t
	parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta)
	{
	uint64_t old_accounted = MAX(used, dsl_dir_phys(dd)->dd_reserved);
	uint64_t new_accounted =
	MAX(used + delta, dsl_dir_phys(dd)->dd_reserved);
	return (new_accounted - old_accounted);
	}

	void
	dsl_dir_sync(dsl_dir_t dd, dmu_tx_t tx)
	{
	ASSERT(dmu_tx_is_syncing(tx));

	mutex_enter(&dd->dd_lock);
	ASSERT0(dd->dd_tempreserved[tx->tx_txg & TXG_MASK]);
	dprintf_dd(dd, "txg=%llu towrite=%lluK\n", (u_longlong_t)tx->tx_txg,
	(u_longlong_t)dd->dd_space_towrite[tx->tx_txg & TXG_MASK] / 1024);
	dd->dd_space_towrite[tx->tx_txg & TXG_MASK] = 0;
	mutex_exit(&dd->dd_lock);

	/* release the hold from dsl_dir_dirty */
	dmu_buf_rele(dd->dd_dbuf, dd);
	}

	static uint64_t
	dsl_dir_space_towrite(dsl_dir_t *dd)
	{
	uint64_t space = 0;

	ASSERT(MUTEX_HELD(&dd->dd_lock));

	for (int i = 0; i < TXG_SIZE; i++) {
	space += dd->dd_space_towrite[i & TXG_MASK];
	ASSERT3U(dd->dd_space_towrite[i & TXG_MASK], >=, 0);
	}
	return (space);
	}

	/*
	* How much space would dd have available if ancestor had delta applied
	* to it? If ondiskonly is set, we're only interested in what's
	* on-disk, not estimated pending changes.
	*/
	uint64_t
	dsl_dir_space_available(dsl_dir_t *dd,
	dsl_dir_t *ancestor, int64_t delta, int ondiskonly)
	{
	uint64_t parentspace, myspace, quota, used;

	/*
	* If there are no restrictions otherwise, assume we have
	* unlimited space available.
	*/
	quota = UINT64_MAX;
	parentspace = UINT64_MAX;

	if (dd->dd_parent != NULL) {
	parentspace = dsl_dir_space_available(dd->dd_parent,
	ancestor, delta, ondiskonly);
	}

	mutex_enter(&dd->dd_lock);
	if (dsl_dir_phys(dd)->dd_quota != 0)
	quota = dsl_dir_phys(dd)->dd_quota;
	used = dsl_dir_phys(dd)->dd_used_bytes;
	if (!ondiskonly)
	used += dsl_dir_space_towrite(dd);

	if (dd->dd_parent == NULL) {
	uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool,
	ZFS_SPACE_CHECK_NORMAL);
	quota = MIN(quota, poolsize);
	}

	if (dsl_dir_phys(dd)->dd_reserved > used && parentspace != UINT64_MAX) {
	/*
	* We have some space reserved, in addition to what our
	* parent gave us.
	*/
	parentspace += dsl_dir_phys(dd)->dd_reserved - used;
	}

	if (dd == ancestor) {
	ASSERT(delta <= 0);
	ASSERT(used >= -delta);
	used += delta;
	if (parentspace != UINT64_MAX)
	parentspace -= delta;
	}

	if (used > quota) {
	/* over quota */
	myspace = 0;
	} else {
	/*
	* the lesser of the space provided by our parent and
	* the space left in our quota
	*/
	myspace = MIN(parentspace, quota - used);
	}

	mutex_exit(&dd->dd_lock);

	return (myspace);
	}

	struct tempreserve {
	list_node_t tr_node;
	dsl_dir_t *tr_ds;
	uint64_t tr_size;
	};

	static int
	dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree,
	boolean_t ignorequota, list_t *tr_list,
	dmu_tx_t *tx, boolean_t first)
	{
	uint64_t txg;
	uint64_t quota;
	struct tempreserve *tr;
	int retval;
	uint64_t ref_rsrv;

	top_of_function:
	txg = tx->tx_txg;
	retval = EDQUOT;
	ref_rsrv = 0;

	ASSERT3U(txg, !=, 0);
	ASSERT3S(asize, >, 0);

	mutex_enter(&dd->dd_lock);

	/*
	* Check against the dsl_dir's quota. We don't add in the delta
	* when checking for over-quota because they get one free hit.
	*/
	uint64_t est_inflight = dsl_dir_space_towrite(dd);
	for (int i = 0; i < TXG_SIZE; i++)
	est_inflight += dd->dd_tempreserved[i];
	uint64_t used_on_disk = dsl_dir_phys(dd)->dd_used_bytes;

	/*
	* On the first iteration, fetch the dataset's used-on-disk and
	* refreservation values. Also, if checkrefquota is set, test if
	* allocating this space would exceed the dataset's refquota.
	*/
	if (first && tx->tx_objset) {
	int error;
	dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset;

	error = dsl_dataset_check_quota(ds, !netfree,
	asize, est_inflight, &used_on_disk, &ref_rsrv);
	if (error != 0) {
	mutex_exit(&dd->dd_lock);
	DMU_TX_STAT_BUMP(dmu_tx_quota);
	return (error);
	}
	}

	/*
	* If this transaction will result in a net free of space,
	* we want to let it through.
	*/
	if (ignorequota \|\| netfree \|\| dsl_dir_phys(dd)->dd_quota == 0)
	quota = UINT64_MAX;
	else
	quota = dsl_dir_phys(dd)->dd_quota;

	/*
	* Adjust the quota against the actual pool size at the root
	* minus any outstanding deferred frees.
	* To ensure that it's possible to remove files from a full
	* pool without inducing transient overcommits, we throttle
	* netfree transactions against a quota that is slightly larger,
	* but still within the pool's allocation slop. In cases where
	* we're very close to full, this will allow a steady trickle of
	* removes to get through.
	*/
	uint64_t deferred = 0;
	if (dd->dd_parent == NULL) {
	uint64_t avail = dsl_pool_unreserved_space(dd->dd_pool,
	(netfree) ?
	ZFS_SPACE_CHECK_RESERVED : ZFS_SPACE_CHECK_NORMAL);

	if (avail < quota) {
	quota = avail;
	retval = SET_ERROR(ENOSPC);
	}
	}

	/*
	* If they are requesting more space, and our current estimate
	* is over quota, they get to try again unless the actual
	* on-disk is over quota and there are no pending changes (which
	* may free up space for us).
	*/
	if (used_on_disk + est_inflight >= quota) {
	if (est_inflight > 0 \|\| used_on_disk < quota \|\|
	(retval == ENOSPC && used_on_disk < quota + deferred))
	retval = ERESTART;
	dprintf_dd(dd, "failing: used=%lluK inflight = %lluK "
	"quota=%lluK tr=%lluK err=%d\n",
	(u_longlong_t)used_on_disk>>10,
	(u_longlong_t)est_inflight>>10,
	(u_longlong_t)quota>>10, (u_longlong_t)asize>>10, retval);
	mutex_exit(&dd->dd_lock);
	DMU_TX_STAT_BUMP(dmu_tx_quota);
	return (SET_ERROR(retval));
	}

	/* We need to up our estimated delta before dropping dd_lock */
	dd->dd_tempreserved[txg & TXG_MASK] += asize;

	uint64_t parent_rsrv = parent_delta(dd, used_on_disk + est_inflight,
	asize - ref_rsrv);
	mutex_exit(&dd->dd_lock);

	tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
	tr->tr_ds = dd;
	tr->tr_size = asize;
	list_insert_tail(tr_list, tr);

	/* see if it's OK with our parent */
	if (dd->dd_parent != NULL && parent_rsrv != 0) {
	/*
	* Recurse on our parent without recursion. This has been
	* observed to be potentially large stack usage even within
	* the test suite. Largest seen stack was 7632 bytes on linux.
	*/

	dd = dd->dd_parent;
	asize = parent_rsrv;
	ignorequota = (dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
	first = B_FALSE;
	goto top_of_function;

	} else {
	return (0);
	}
	}

	/*
	* Reserve space in this dsl_dir, to be used in this tx's txg.
	* After the space has been dirtied (and dsl_dir_willuse_space()
	* has been called), the reservation should be canceled, using
	* dsl_dir_tempreserve_clear().
	*/
	int
	dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize,
	boolean_t netfree, void *tr_cookiep, dmu_tx_t tx)
	{
	int err;
	list_t *tr_list;

	if (asize == 0) {
	*tr_cookiep = NULL;
	return (0);
	}

	tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
	list_create(tr_list, sizeof (struct tempreserve),
	offsetof(struct tempreserve, tr_node));
	ASSERT3S(asize, >, 0);

	err = arc_tempreserve_space(dd->dd_pool->dp_spa, lsize, tx->tx_txg);
	if (err == 0) {
	struct tempreserve *tr;

	tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
	tr->tr_size = lsize;
	list_insert_tail(tr_list, tr);
	} else {
	if (err == EAGAIN) {
	/*
	* If arc_memory_throttle() detected that pageout
	* is running and we are low on memory, we delay new
	* non-pageout transactions to give pageout an
	* advantage.
	*
	* It is unfortunate to be delaying while the caller's
	* locks are held.
	*/
	txg_delay(dd->dd_pool, tx->tx_txg,
	MSEC2NSEC(10), MSEC2NSEC(10));
	err = SET_ERROR(ERESTART);
	}
	}

	if (err == 0) {
	err = dsl_dir_tempreserve_impl(dd, asize, netfree,
	B_FALSE, tr_list, tx, B_TRUE);
	}

	if (err != 0)
	dsl_dir_tempreserve_clear(tr_list, tx);
	else
	*tr_cookiep = tr_list;

	return (err);
	}

	/*
	* Clear a temporary reservation that we previously made with
	* dsl_dir_tempreserve_space().
	*/
	void
	dsl_dir_tempreserve_clear(void tr_cookie, dmu_tx_t tx)
	{
	int txgidx = tx->tx_txg & TXG_MASK;
	list_t *tr_list = tr_cookie;
	struct tempreserve *tr;

	ASSERT3U(tx->tx_txg, !=, 0);

	if (tr_cookie == NULL)
	return;

	while ((tr = list_head(tr_list)) != NULL) {
	if (tr->tr_ds) {
	mutex_enter(&tr->tr_ds->dd_lock);
	ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=,
	tr->tr_size);
	tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size;
	mutex_exit(&tr->tr_ds->dd_lock);
	} else {
	arc_tempreserve_clear(tr->tr_size);
	}
	list_remove(tr_list, tr);
	kmem_free(tr, sizeof (struct tempreserve));
	}

	kmem_free(tr_list, sizeof (list_t));
	}

	/*
	* This should be called from open context when we think we're going to write
	* or free space, for example when dirtying data. Be conservative; it's okay
	* to write less space or free more, but we don't want to write more or free
	* less than the amount specified.
	*
	* NOTE: The behavior of this function is identical to the Illumos / FreeBSD
	* version however it has been adjusted to use an iterative rather than
	* recursive algorithm to minimize stack usage.
	*/
	void
	dsl_dir_willuse_space(dsl_dir_t dd, int64_t space, dmu_tx_t tx)
	{
	int64_t parent_space;
	uint64_t est_used;

	do {
	mutex_enter(&dd->dd_lock);
	if (space > 0)
	dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space;

	est_used = dsl_dir_space_towrite(dd) +
	dsl_dir_phys(dd)->dd_used_bytes;
	parent_space = parent_delta(dd, est_used, space);
	mutex_exit(&dd->dd_lock);

	/* Make sure that we clean up dd_space_to* */
	dsl_dir_dirty(dd, tx);

	dd = dd->dd_parent;
	space = parent_space;
	} while (space && dd);
	}

	/* call from syncing context when we actually write/free space for this dd */
	void
	dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
	int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx)
	{
	int64_t accounted_delta;

	+ ASSERT(dmu_tx_is_syncing(tx));
	+ ASSERT(type < DD_USED_NUM);
	+
	+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
	+
	/*
	* dsl_dataset_set_refreservation_sync_impl() calls this with
	* dd_lock held, so that it can atomically update
	* ds->ds_reserved and the dsl_dir accounting, so that
	* dsl_dataset_check_quota() can see dataset and dir accounting
	* consistently.
	*/
	boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
	-
	- ASSERT(dmu_tx_is_syncing(tx));
	- ASSERT(type < DD_USED_NUM);
	-
	- dmu_buf_will_dirty(dd->dd_dbuf, tx);
	-
	if (needlock)
	mutex_enter(&dd->dd_lock);
	- accounted_delta =
	- parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, used);
	- ASSERT(used >= 0 \|\| dsl_dir_phys(dd)->dd_used_bytes >= -used);
	- ASSERT(compressed >= 0 \|\|
	- dsl_dir_phys(dd)->dd_compressed_bytes >= -compressed);
	+ dsl_dir_phys_t *ddp = dsl_dir_phys(dd);
	+ accounted_delta = parent_delta(dd, ddp->dd_used_bytes, used);
	+ ASSERT(used >= 0 \|\| ddp->dd_used_bytes >= -used);
	+ ASSERT(compressed >= 0 \|\| ddp->dd_compressed_bytes >= -compressed);
	ASSERT(uncompressed >= 0 \|\|
	- dsl_dir_phys(dd)->dd_uncompressed_bytes >= -uncompressed);
	- dsl_dir_phys(dd)->dd_used_bytes += used;
	- dsl_dir_phys(dd)->dd_uncompressed_bytes += uncompressed;
	- dsl_dir_phys(dd)->dd_compressed_bytes += compressed;
	-
	- if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
	- ASSERT(used > 0 \|\|
	- dsl_dir_phys(dd)->dd_used_breakdown[type] >= -used);
	- dsl_dir_phys(dd)->dd_used_breakdown[type] += used;
	+ ddp->dd_uncompressed_bytes >= -uncompressed);
	+ ddp->dd_used_bytes += used;
	+ ddp->dd_uncompressed_bytes += uncompressed;
	+ ddp->dd_compressed_bytes += compressed;
	+
	+ if (ddp->dd_flags & DD_FLAG_USED_BREAKDOWN) {
	+ ASSERT(used >= 0 \|\| ddp->dd_used_breakdown[type] >= -used);
	+ ddp->dd_used_breakdown[type] += used;
	#ifdef ZFS_DEBUG
	{
	dd_used_t t;
	uint64_t u = 0;
	for (t = 0; t < DD_USED_NUM; t++)
	- u += dsl_dir_phys(dd)->dd_used_breakdown[t];
	- ASSERT3U(u, ==, dsl_dir_phys(dd)->dd_used_bytes);
	+ u += ddp->dd_used_breakdown[t];
	+ ASSERT3U(u, ==, ddp->dd_used_bytes);
	}
	#endif
	}
	if (needlock)
	mutex_exit(&dd->dd_lock);

	if (dd->dd_parent != NULL) {
	- dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
	- accounted_delta, compressed, uncompressed, tx);
	- dsl_dir_transfer_space(dd->dd_parent,
	- used - accounted_delta,
	- DD_USED_CHILD_RSRV, DD_USED_CHILD, tx);
	+ dsl_dir_diduse_transfer_space(dd->dd_parent,
	+ accounted_delta, compressed, uncompressed,
	+ used, DD_USED_CHILD_RSRV, DD_USED_CHILD, tx);
	}
	}

	void
	dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
	dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx)
	{
	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(oldtype < DD_USED_NUM);
	ASSERT(newtype < DD_USED_NUM);

	+ dsl_dir_phys_t *ddp = dsl_dir_phys(dd);
	if (delta == 0 \|\|
	- !(dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN))
	+ !(ddp->dd_flags & DD_FLAG_USED_BREAKDOWN))
	return;

	dmu_buf_will_dirty(dd->dd_dbuf, tx);
	mutex_enter(&dd->dd_lock);
	ASSERT(delta > 0 ?
	- dsl_dir_phys(dd)->dd_used_breakdown[oldtype] >= delta :
	- dsl_dir_phys(dd)->dd_used_breakdown[newtype] >= -delta);
	- ASSERT(dsl_dir_phys(dd)->dd_used_bytes >= ABS(delta));
	- dsl_dir_phys(dd)->dd_used_breakdown[oldtype] -= delta;
	- dsl_dir_phys(dd)->dd_used_breakdown[newtype] += delta;
	+ ddp->dd_used_breakdown[oldtype] >= delta :
	+ ddp->dd_used_breakdown[newtype] >= -delta);
	+ ASSERT(ddp->dd_used_bytes >= ABS(delta));
	+ ddp->dd_used_breakdown[oldtype] -= delta;
	+ ddp->dd_used_breakdown[newtype] += delta;
	mutex_exit(&dd->dd_lock);
	}

	+void
	+dsl_dir_diduse_transfer_space(dsl_dir_t *dd, int64_t used,
	+ int64_t compressed, int64_t uncompressed, int64_t tonew,
	+ dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx)
	+{
	+ int64_t accounted_delta;
	+
	+ ASSERT(dmu_tx_is_syncing(tx));
	+ ASSERT(oldtype < DD_USED_NUM);
	+ ASSERT(newtype < DD_USED_NUM);
	+
	+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
	+
	+ mutex_enter(&dd->dd_lock);
	+ dsl_dir_phys_t *ddp = dsl_dir_phys(dd);
	+ accounted_delta = parent_delta(dd, ddp->dd_used_bytes, used);
	+ ASSERT(used >= 0 \|\| ddp->dd_used_bytes >= -used);
	+ ASSERT(compressed >= 0 \|\| ddp->dd_compressed_bytes >= -compressed);
	+ ASSERT(uncompressed >= 0 \|\|
	+ ddp->dd_uncompressed_bytes >= -uncompressed);
	+ ddp->dd_used_bytes += used;
	+ ddp->dd_uncompressed_bytes += uncompressed;
	+ ddp->dd_compressed_bytes += compressed;
	+
	+ if (ddp->dd_flags & DD_FLAG_USED_BREAKDOWN) {
	+ ASSERT(tonew - used <= 0 \|\|
	+ ddp->dd_used_breakdown[oldtype] >= tonew - used);
	+ ASSERT(tonew >= 0 \|\|
	+ ddp->dd_used_breakdown[newtype] >= -tonew);
	+ ddp->dd_used_breakdown[oldtype] -= tonew - used;
	+ ddp->dd_used_breakdown[newtype] += tonew;
	+#ifdef ZFS_DEBUG
	+ {
	+ dd_used_t t;
	+ uint64_t u = 0;
	+ for (t = 0; t < DD_USED_NUM; t++)
	+ u += ddp->dd_used_breakdown[t];
	+ ASSERT3U(u, ==, ddp->dd_used_bytes);
	+ }
	+#endif
	+ }
	+ mutex_exit(&dd->dd_lock);
	+
	+ if (dd->dd_parent != NULL) {
	+ dsl_dir_diduse_transfer_space(dd->dd_parent,
	+ accounted_delta, compressed, uncompressed,
	+ used, DD_USED_CHILD_RSRV, DD_USED_CHILD, tx);
	+ }
	+}
	+
	typedef struct dsl_dir_set_qr_arg {
	const char *ddsqra_name;
	zprop_source_t ddsqra_source;
	uint64_t ddsqra_value;
	} dsl_dir_set_qr_arg_t;

	static int
	dsl_dir_set_quota_check(void arg, dmu_tx_t tx)
	{
	dsl_dir_set_qr_arg_t *ddsqra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	int error;
	uint64_t towrite, newval;

	error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
	if (error != 0)
	return (error);

	error = dsl_prop_predict(ds->ds_dir, "quota",
	ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	if (newval == 0) {
	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	mutex_enter(&ds->ds_dir->dd_lock);
	/*
	* If we are doing the preliminary check in open context, and
	* there are pending changes, then don't fail it, since the
	* pending changes could under-estimate the amount of space to be
	* freed up.
	*/
	towrite = dsl_dir_space_towrite(ds->ds_dir);
	if ((dmu_tx_is_syncing(tx) \|\| towrite == 0) &&
	(newval < dsl_dir_phys(ds->ds_dir)->dd_reserved \|\|
	newval < dsl_dir_phys(ds->ds_dir)->dd_used_bytes + towrite)) {
	error = SET_ERROR(ENOSPC);
	}
	mutex_exit(&ds->ds_dir->dd_lock);
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	static void
	dsl_dir_set_quota_sync(void arg, dmu_tx_t tx)
	{
	dsl_dir_set_qr_arg_t *ddsqra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	uint64_t newval;

	VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));

	if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
	dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_QUOTA),
	ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
	&ddsqra->ddsqra_value, tx);

	VERIFY0(dsl_prop_get_int_ds(ds,
	zfs_prop_to_name(ZFS_PROP_QUOTA), &newval));
	} else {
	newval = ddsqra->ddsqra_value;
	spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
	zfs_prop_to_name(ZFS_PROP_QUOTA), (longlong_t)newval);
	}

	dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
	mutex_enter(&ds->ds_dir->dd_lock);
	dsl_dir_phys(ds->ds_dir)->dd_quota = newval;
	mutex_exit(&ds->ds_dir->dd_lock);
	dsl_dataset_rele(ds, FTAG);
	}

	int
	dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota)
	{
	dsl_dir_set_qr_arg_t ddsqra;

	ddsqra.ddsqra_name = ddname;
	ddsqra.ddsqra_source = source;
	ddsqra.ddsqra_value = quota;

	return (dsl_sync_task(ddname, dsl_dir_set_quota_check,
	dsl_dir_set_quota_sync, &ddsqra, 0,
	ZFS_SPACE_CHECK_EXTRA_RESERVED));
	}

	static int
	dsl_dir_set_reservation_check(void arg, dmu_tx_t tx)
	{
	dsl_dir_set_qr_arg_t *ddsqra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	dsl_dir_t *dd;
	uint64_t newval, used, avail;
	int error;

	error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
	if (error != 0)
	return (error);
	dd = ds->ds_dir;

	/*
	* If we are doing the preliminary check in open context, the
	* space estimates may be inaccurate.
	*/
	if (!dmu_tx_is_syncing(tx)) {
	dsl_dataset_rele(ds, FTAG);
	return (0);
	}

	error = dsl_prop_predict(ds->ds_dir,
	zfs_prop_to_name(ZFS_PROP_RESERVATION),
	ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	mutex_enter(&dd->dd_lock);
	used = dsl_dir_phys(dd)->dd_used_bytes;
	mutex_exit(&dd->dd_lock);

	if (dd->dd_parent) {
	avail = dsl_dir_space_available(dd->dd_parent,
	NULL, 0, FALSE);
	} else {
	avail = dsl_pool_adjustedsize(dd->dd_pool,
	ZFS_SPACE_CHECK_NORMAL) - used;
	}

	if (MAX(used, newval) > MAX(used, dsl_dir_phys(dd)->dd_reserved)) {
	uint64_t delta = MAX(used, newval) -
	MAX(used, dsl_dir_phys(dd)->dd_reserved);

	if (delta > avail \|\|
	(dsl_dir_phys(dd)->dd_quota > 0 &&
	newval > dsl_dir_phys(dd)->dd_quota))
	error = SET_ERROR(ENOSPC);
	}

	dsl_dataset_rele(ds, FTAG);
	return (error);
	}

	void
	dsl_dir_set_reservation_sync_impl(dsl_dir_t dd, uint64_t value, dmu_tx_t tx)
	{
	uint64_t used;
	int64_t delta;

	dmu_buf_will_dirty(dd->dd_dbuf, tx);

	mutex_enter(&dd->dd_lock);
	used = dsl_dir_phys(dd)->dd_used_bytes;
	delta = MAX(used, value) - MAX(used, dsl_dir_phys(dd)->dd_reserved);
	dsl_dir_phys(dd)->dd_reserved = value;

	if (dd->dd_parent != NULL) {
	/* Roll up this additional usage into our ancestors */
	dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
	delta, 0, 0, tx);
	}
	mutex_exit(&dd->dd_lock);
	}

	static void
	dsl_dir_set_reservation_sync(void arg, dmu_tx_t tx)
	{
	dsl_dir_set_qr_arg_t *ddsqra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dataset_t *ds;
	uint64_t newval;

	VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));

	if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
	dsl_prop_set_sync_impl(ds,
	zfs_prop_to_name(ZFS_PROP_RESERVATION),
	ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
	&ddsqra->ddsqra_value, tx);

	VERIFY0(dsl_prop_get_int_ds(ds,
	zfs_prop_to_name(ZFS_PROP_RESERVATION), &newval));
	} else {
	newval = ddsqra->ddsqra_value;
	spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
	zfs_prop_to_name(ZFS_PROP_RESERVATION),
	(longlong_t)newval);
	}

	dsl_dir_set_reservation_sync_impl(ds->ds_dir, newval, tx);
	dsl_dataset_rele(ds, FTAG);
	}

	int
	dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
	uint64_t reservation)
	{
	dsl_dir_set_qr_arg_t ddsqra;

	ddsqra.ddsqra_name = ddname;
	ddsqra.ddsqra_source = source;
	ddsqra.ddsqra_value = reservation;

	return (dsl_sync_task(ddname, dsl_dir_set_reservation_check,
	dsl_dir_set_reservation_sync, &ddsqra, 0,
	ZFS_SPACE_CHECK_EXTRA_RESERVED));
	}

	static dsl_dir_t *
	closest_common_ancestor(dsl_dir_t ds1, dsl_dir_t ds2)
	{
	for (; ds1; ds1 = ds1->dd_parent) {
	dsl_dir_t *dd;
	for (dd = ds2; dd; dd = dd->dd_parent) {
	if (ds1 == dd)
	return (dd);
	}
	}
	return (NULL);
	}

	/*
	* If delta is applied to dd, how much of that delta would be applied to
	* ancestor? Syncing context only.
	*/
	static int64_t
	would_change(dsl_dir_t dd, int64_t delta, dsl_dir_t ancestor)
	{
	if (dd == ancestor)
	return (delta);

	mutex_enter(&dd->dd_lock);
	delta = parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, delta);
	mutex_exit(&dd->dd_lock);
	return (would_change(dd->dd_parent, delta, ancestor));
	}

	typedef struct dsl_dir_rename_arg {
	const char *ddra_oldname;
	const char *ddra_newname;
	cred_t *ddra_cred;
	proc_t *ddra_proc;
	} dsl_dir_rename_arg_t;

	typedef struct dsl_valid_rename_arg {
	int char_delta;
	int nest_delta;
	} dsl_valid_rename_arg_t;

	/* ARGSUSED */
	static int
	dsl_valid_rename(dsl_pool_t dp, dsl_dataset_t ds, void *arg)
	{
	dsl_valid_rename_arg_t *dvra = arg;
	char namebuf[ZFS_MAX_DATASET_NAME_LEN];

	dsl_dataset_name(ds, namebuf);

	ASSERT3U(strnlen(namebuf, ZFS_MAX_DATASET_NAME_LEN),
	<, ZFS_MAX_DATASET_NAME_LEN);
	int namelen = strlen(namebuf) + dvra->char_delta;
	int depth = get_dataset_depth(namebuf) + dvra->nest_delta;

	if (namelen >= ZFS_MAX_DATASET_NAME_LEN)
	return (SET_ERROR(ENAMETOOLONG));
	if (dvra->nest_delta > 0 && depth >= zfs_max_dataset_nesting)
	return (SET_ERROR(ENAMETOOLONG));
	return (0);
	}

	static int
	dsl_dir_rename_check(void arg, dmu_tx_t tx)
	{
	dsl_dir_rename_arg_t *ddra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dir_t dd, newparent;
	dsl_valid_rename_arg_t dvra;
	dsl_dataset_t *parentds;
	objset_t *parentos;
	const char *mynewname;
	int error;

	/* target dir should exist */
	error = dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL);
	if (error != 0)
	return (error);

	/* new parent should exist */
	error = dsl_dir_hold(dp, ddra->ddra_newname, FTAG,
	&newparent, &mynewname);
	if (error != 0) {
	dsl_dir_rele(dd, FTAG);
	return (error);
	}

	/* can't rename to different pool */
	if (dd->dd_pool != newparent->dd_pool) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (SET_ERROR(EXDEV));
	}

	/* new name should not already exist */
	if (mynewname == NULL) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (SET_ERROR(EEXIST));
	}

	/* can't rename below anything but filesystems (eg. no ZVOLs) */
	error = dsl_dataset_hold_obj(newparent->dd_pool,
	dsl_dir_phys(newparent)->dd_head_dataset_obj, FTAG, &parentds);
	if (error != 0) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (error);
	}
	error = dmu_objset_from_ds(parentds, &parentos);
	if (error != 0) {
	dsl_dataset_rele(parentds, FTAG);
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (error);
	}
	if (dmu_objset_type(parentos) != DMU_OST_ZFS) {
	dsl_dataset_rele(parentds, FTAG);
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (SET_ERROR(ZFS_ERR_WRONG_PARENT));
	}
	dsl_dataset_rele(parentds, FTAG);

	ASSERT3U(strnlen(ddra->ddra_newname, ZFS_MAX_DATASET_NAME_LEN),
	<, ZFS_MAX_DATASET_NAME_LEN);
	ASSERT3U(strnlen(ddra->ddra_oldname, ZFS_MAX_DATASET_NAME_LEN),
	<, ZFS_MAX_DATASET_NAME_LEN);
	dvra.char_delta = strlen(ddra->ddra_newname)
	- strlen(ddra->ddra_oldname);
	dvra.nest_delta = get_dataset_depth(ddra->ddra_newname)
	- get_dataset_depth(ddra->ddra_oldname);

	/* if the name length is growing, validate child name lengths */
	if (dvra.char_delta > 0 \|\| dvra.nest_delta > 0) {
	error = dmu_objset_find_dp(dp, dd->dd_object, dsl_valid_rename,
	&dvra, DS_FIND_CHILDREN \| DS_FIND_SNAPSHOTS);
	if (error != 0) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (error);
	}
	}

	if (dmu_tx_is_syncing(tx)) {
	if (spa_feature_is_active(dp->dp_spa,
	SPA_FEATURE_FS_SS_LIMIT)) {
	/*
	* Although this is the check function and we don't
	* normally make on-disk changes in check functions,
	* we need to do that here.
	*
	* Ensure this portion of the tree's counts have been
	* initialized in case the new parent has limits set.
	*/
	dsl_dir_init_fs_ss_count(dd, tx);
	}
	}

	if (newparent != dd->dd_parent) {
	/* is there enough space? */
	uint64_t myspace =
	MAX(dsl_dir_phys(dd)->dd_used_bytes,
	dsl_dir_phys(dd)->dd_reserved);
	objset_t *os = dd->dd_pool->dp_meta_objset;
	uint64_t fs_cnt = 0;
	uint64_t ss_cnt = 0;

	if (dsl_dir_is_zapified(dd)) {
	int err;

	err = zap_lookup(os, dd->dd_object,
	DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
	&fs_cnt);
	if (err != ENOENT && err != 0) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (err);
	}

	/*
	* have to add 1 for the filesystem itself that we're
	* moving
	*/
	fs_cnt++;

	err = zap_lookup(os, dd->dd_object,
	DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
	&ss_cnt);
	if (err != ENOENT && err != 0) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (err);
	}
	}

	/* check for encryption errors */
	error = dsl_dir_rename_crypt_check(dd, newparent);
	if (error != 0) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (SET_ERROR(EACCES));
	}

	/* no rename into our descendant */
	if (closest_common_ancestor(dd, newparent) == dd) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (SET_ERROR(EINVAL));
	}

	error = dsl_dir_transfer_possible(dd->dd_parent,
	newparent, fs_cnt, ss_cnt, myspace,
	ddra->ddra_cred, ddra->ddra_proc);
	if (error != 0) {
	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (error);
	}
	}

	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	return (0);
	}

	static void
	dsl_dir_rename_sync(void arg, dmu_tx_t tx)
	{
	dsl_dir_rename_arg_t *ddra = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dir_t dd, newparent;
	const char *mynewname;
	objset_t *mos = dp->dp_meta_objset;

	VERIFY0(dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL));
	VERIFY0(dsl_dir_hold(dp, ddra->ddra_newname, FTAG, &newparent,
	&mynewname));

	/* Log this before we change the name. */
	spa_history_log_internal_dd(dd, "rename", tx,
	"-> %s", ddra->ddra_newname);

	if (newparent != dd->dd_parent) {
	objset_t *os = dd->dd_pool->dp_meta_objset;
	uint64_t fs_cnt = 0;
	uint64_t ss_cnt = 0;

	/*
	* We already made sure the dd counts were initialized in the
	* check function.
	*/
	if (spa_feature_is_active(dp->dp_spa,
	SPA_FEATURE_FS_SS_LIMIT)) {
	VERIFY0(zap_lookup(os, dd->dd_object,
	DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
	&fs_cnt));
	/* add 1 for the filesystem itself that we're moving */
	fs_cnt++;

	VERIFY0(zap_lookup(os, dd->dd_object,
	DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
	&ss_cnt));
	}

	dsl_fs_ss_count_adjust(dd->dd_parent, -fs_cnt,
	DD_FIELD_FILESYSTEM_COUNT, tx);
	dsl_fs_ss_count_adjust(newparent, fs_cnt,
	DD_FIELD_FILESYSTEM_COUNT, tx);

	dsl_fs_ss_count_adjust(dd->dd_parent, -ss_cnt,
	DD_FIELD_SNAPSHOT_COUNT, tx);
	dsl_fs_ss_count_adjust(newparent, ss_cnt,
	DD_FIELD_SNAPSHOT_COUNT, tx);

	dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
	-dsl_dir_phys(dd)->dd_used_bytes,
	-dsl_dir_phys(dd)->dd_compressed_bytes,
	-dsl_dir_phys(dd)->dd_uncompressed_bytes, tx);
	dsl_dir_diduse_space(newparent, DD_USED_CHILD,
	dsl_dir_phys(dd)->dd_used_bytes,
	dsl_dir_phys(dd)->dd_compressed_bytes,
	dsl_dir_phys(dd)->dd_uncompressed_bytes, tx);

	if (dsl_dir_phys(dd)->dd_reserved >
	dsl_dir_phys(dd)->dd_used_bytes) {
	uint64_t unused_rsrv = dsl_dir_phys(dd)->dd_reserved -
	dsl_dir_phys(dd)->dd_used_bytes;

	dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
	-unused_rsrv, 0, 0, tx);
	dsl_dir_diduse_space(newparent, DD_USED_CHILD_RSRV,
	unused_rsrv, 0, 0, tx);
	}
	}

	dmu_buf_will_dirty(dd->dd_dbuf, tx);

	/* remove from old parent zapobj */
	VERIFY0(zap_remove(mos,
	dsl_dir_phys(dd->dd_parent)->dd_child_dir_zapobj,
	dd->dd_myname, tx));

	(void) strlcpy(dd->dd_myname, mynewname,
	sizeof (dd->dd_myname));
	dsl_dir_rele(dd->dd_parent, dd);
	dsl_dir_phys(dd)->dd_parent_obj = newparent->dd_object;
	VERIFY0(dsl_dir_hold_obj(dp,
	newparent->dd_object, NULL, dd, &dd->dd_parent));

	/* add to new parent zapobj */
	VERIFY0(zap_add(mos, dsl_dir_phys(newparent)->dd_child_dir_zapobj,
	dd->dd_myname, 8, 1, &dd->dd_object, tx));

	/* TODO: A rename callback to avoid these layering violations. */
	zfsvfs_update_fromname(ddra->ddra_oldname, ddra->ddra_newname);
	zvol_rename_minors(dp->dp_spa, ddra->ddra_oldname,
	ddra->ddra_newname, B_TRUE);

	dsl_prop_notify_all(dd);

	dsl_dir_rele(newparent, FTAG);
	dsl_dir_rele(dd, FTAG);
	}

	int
	dsl_dir_rename(const char oldname, const char newname)
	{
	dsl_dir_rename_arg_t ddra;

	ddra.ddra_oldname = oldname;
	ddra.ddra_newname = newname;
	ddra.ddra_cred = CRED();
	ddra.ddra_proc = curproc;

	return (dsl_sync_task(oldname,
	dsl_dir_rename_check, dsl_dir_rename_sync, &ddra,
	3, ZFS_SPACE_CHECK_RESERVED));
	}

	int
	dsl_dir_transfer_possible(dsl_dir_t sdd, dsl_dir_t tdd,
	uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space,
	cred_t cr, proc_t proc)
	{
	dsl_dir_t *ancestor;
	int64_t adelta;
	uint64_t avail;
	int err;

	ancestor = closest_common_ancestor(sdd, tdd);
	adelta = would_change(sdd, -space, ancestor);
	avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE);
	if (avail < space)
	return (SET_ERROR(ENOSPC));

	err = dsl_fs_ss_limit_check(tdd, fs_cnt, ZFS_PROP_FILESYSTEM_LIMIT,
	ancestor, cr, proc);
	if (err != 0)
	return (err);
	err = dsl_fs_ss_limit_check(tdd, ss_cnt, ZFS_PROP_SNAPSHOT_LIMIT,
	ancestor, cr, proc);
	if (err != 0)
	return (err);

	return (0);
	}

	inode_timespec_t
	dsl_dir_snap_cmtime(dsl_dir_t *dd)
	{
	inode_timespec_t t;

	mutex_enter(&dd->dd_lock);
	t = dd->dd_snap_cmtime;
	mutex_exit(&dd->dd_lock);

	return (t);
	}

	void
	dsl_dir_snap_cmtime_update(dsl_dir_t *dd)
	{
	inode_timespec_t t;

	gethrestime(&t);
	mutex_enter(&dd->dd_lock);
	dd->dd_snap_cmtime = t;
	mutex_exit(&dd->dd_lock);
	}

	void
	dsl_dir_zapify(dsl_dir_t dd, dmu_tx_t tx)
	{
	objset_t *mos = dd->dd_pool->dp_meta_objset;
	dmu_object_zapify(mos, dd->dd_object, DMU_OT_DSL_DIR, tx);
	}

	boolean_t
	dsl_dir_is_zapified(dsl_dir_t *dd)
	{
	dmu_object_info_t doi;

	dmu_object_info_from_db(dd->dd_dbuf, &doi);
	return (doi.doi_type == DMU_OTN_ZAP_METADATA);
	}

	void
	dsl_dir_livelist_open(dsl_dir_t *dd, uint64_t obj)
	{
	objset_t *mos = dd->dd_pool->dp_meta_objset;
	ASSERT(spa_feature_is_active(dd->dd_pool->dp_spa,
	SPA_FEATURE_LIVELIST));
	dsl_deadlist_open(&dd->dd_livelist, mos, obj);
	bplist_create(&dd->dd_pending_allocs);
	bplist_create(&dd->dd_pending_frees);
	}

	void
	dsl_dir_livelist_close(dsl_dir_t *dd)
	{
	dsl_deadlist_close(&dd->dd_livelist);
	bplist_destroy(&dd->dd_pending_allocs);
	bplist_destroy(&dd->dd_pending_frees);
	}

	void
	dsl_dir_remove_livelist(dsl_dir_t dd, dmu_tx_t tx, boolean_t total)
	{
	uint64_t obj;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	spa_t *spa = dp->dp_spa;
	livelist_condense_entry_t to_condense = spa->spa_to_condense;

	if (!dsl_deadlist_is_open(&dd->dd_livelist))
	return;

	/*
	* If the livelist being removed is set to be condensed, stop the
	* condense zthr and indicate the cancellation in the spa_to_condense
	* struct in case the condense no-wait synctask has already started
	*/
	zthr_t *ll_condense_thread = spa->spa_livelist_condense_zthr;
	if (ll_condense_thread != NULL &&
	(to_condense.ds != NULL) && (to_condense.ds->ds_dir == dd)) {
	/*
	* We use zthr_wait_cycle_done instead of zthr_cancel
	* because we don't want to destroy the zthr, just have
	* it skip its current task.
	*/
	spa->spa_to_condense.cancelled = B_TRUE;
	zthr_wait_cycle_done(ll_condense_thread);
	/*
	* If we've returned from zthr_wait_cycle_done without
	* clearing the to_condense data structure it's either
	* because the no-wait synctask has started (which is
	* indicated by 'syncing' field of to_condense) and we
	* can expect it to clear to_condense on its own.
	* Otherwise, we returned before the zthr ran. The
	* checkfunc will now fail as cancelled == B_TRUE so we
	* can safely NULL out ds, allowing a different dir's
	* livelist to be condensed.
	*
	* We can be sure that the to_condense struct will not
	* be repopulated at this stage because both this
	* function and dsl_livelist_try_condense execute in
	* syncing context.
	*/
	if ((spa->spa_to_condense.ds != NULL) &&
	!spa->spa_to_condense.syncing) {
	dmu_buf_rele(spa->spa_to_condense.ds->ds_dbuf,
	spa);
	spa->spa_to_condense.ds = NULL;
	}
	}

	dsl_dir_livelist_close(dd);
	VERIFY0(zap_lookup(dp->dp_meta_objset, dd->dd_object,
	DD_FIELD_LIVELIST, sizeof (uint64_t), 1, &obj));
	VERIFY0(zap_remove(dp->dp_meta_objset, dd->dd_object,
	DD_FIELD_LIVELIST, tx));
	if (total) {
	dsl_deadlist_free(dp->dp_meta_objset, obj, tx);
	spa_feature_decr(spa, SPA_FEATURE_LIVELIST, tx);
	}
	}

	static int
	dsl_dir_activity_in_progress(dsl_dir_t dd, dsl_dataset_t ds,
	zfs_wait_activity_t activity, boolean_t *in_progress)
	{
	int error = 0;

	ASSERT(MUTEX_HELD(&dd->dd_activity_lock));

	switch (activity) {
	case ZFS_WAIT_DELETEQ: {
	#ifdef _KERNEL
	objset_t *os;
	error = dmu_objset_from_ds(ds, &os);
	if (error != 0)
	break;

	mutex_enter(&os->os_user_ptr_lock);
	void *user = dmu_objset_get_user(os);
	mutex_exit(&os->os_user_ptr_lock);
	if (dmu_objset_type(os) != DMU_OST_ZFS \|\|
	user == NULL \|\| zfs_get_vfs_flag_unmounted(os)) {
	*in_progress = B_FALSE;
	return (0);
	}

	uint64_t readonly = B_FALSE;
	error = zfs_get_temporary_prop(ds, ZFS_PROP_READONLY, &readonly,
	NULL);

	if (error != 0)
	break;

	if (readonly \|\| !spa_writeable(dd->dd_pool->dp_spa)) {
	*in_progress = B_FALSE;
	return (0);
	}

	uint64_t count, unlinked_obj;
	error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
	&unlinked_obj);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	break;
	}
	error = zap_count(os, unlinked_obj, &count);

	if (error == 0)
	*in_progress = (count != 0);
	break;
	#else
	/*
	* The delete queue is ZPL specific, and libzpool doesn't have
	* it. It doesn't make sense to wait for it.
	*/
	*in_progress = B_FALSE;
	break;
	#endif
	}
	default:
	panic("unrecognized value for activity %d", activity);
	}

	return (error);
	}

	int
	dsl_dir_wait(dsl_dir_t dd, dsl_dataset_t ds, zfs_wait_activity_t activity,
	boolean_t *waited)
	{
	int error = 0;
	boolean_t in_progress;
	dsl_pool_t *dp = dd->dd_pool;
	for (;;) {
	dsl_pool_config_enter(dp, FTAG);
	error = dsl_dir_activity_in_progress(dd, ds, activity,
	&in_progress);
	dsl_pool_config_exit(dp, FTAG);
	if (error != 0 \|\| !in_progress)
	break;

	*waited = B_TRUE;

	if (cv_wait_sig(&dd->dd_activity_cv, &dd->dd_activity_lock) ==
	0 \|\| dd->dd_activity_cancelled) {
	error = SET_ERROR(EINTR);
	break;
	}
	}
	return (error);
	}

	void
	dsl_dir_cancel_waiters(dsl_dir_t *dd)
	{
	mutex_enter(&dd->dd_activity_lock);
	dd->dd_activity_cancelled = B_TRUE;
	cv_broadcast(&dd->dd_activity_cv);
	while (dd->dd_activity_waiters > 0)
	cv_wait(&dd->dd_activity_cv, &dd->dd_activity_lock);
	mutex_exit(&dd->dd_activity_lock);
	}

	#if defined(_KERNEL)
	EXPORT_SYMBOL(dsl_dir_set_quota);
	EXPORT_SYMBOL(dsl_dir_set_reservation);
	#endif
	diff --git a/sys/contrib/openzfs/module/zfs/fm.c b/sys/contrib/openzfs/module/zfs/fm.c
	index dff7d8ece4be..b8a1c7c8a5ca 100644
	--- a/sys/contrib/openzfs/module/zfs/fm.c
	+++ b/sys/contrib/openzfs/module/zfs/fm.c
	@@ -1,1368 +1,1372 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
	*/

	/*
	* Fault Management Architecture (FMA) Resource and Protocol Support
	*
	* The routines contained herein provide services to support kernel subsystems
	* in publishing fault management telemetry (see PSARC 2002/412 and 2003/089).
	*
	* Name-Value Pair Lists
	*
	* The embodiment of an FMA protocol element (event, fmri or authority) is a
	* name-value pair list (nvlist_t). FMA-specific nvlist constructor and
	* destructor functions, fm_nvlist_create() and fm_nvlist_destroy(), are used
	* to create an nvpair list using custom allocators. Callers may choose to
	* allocate either from the kernel memory allocator, or from a preallocated
	* buffer, useful in constrained contexts like high-level interrupt routines.
	*
	* Protocol Event and FMRI Construction
	*
	* Convenience routines are provided to construct nvlist events according to
	* the FMA Event Protocol and Naming Schema specification for ereports and
	* FMRIs for the dev, cpu, hc, mem, legacy hc and de schemes.
	*
	* ENA Manipulation
	*
	* Routines to generate ENA formats 0, 1 and 2 are available as well as
	* routines to increment formats 1 and 2. Individual fields within the
	* ENA are extractable via fm_ena_time_get(), fm_ena_id_get(),
	* fm_ena_format_get() and fm_ena_gen_get().
	*/

	#include <sys/types.h>
	#include <sys/time.h>
	#include <sys/list.h>
	#include <sys/nvpair.h>
	#include <sys/cmn_err.h>
	#include <sys/sysmacros.h>
	#include <sys/sunddi.h>
	#include <sys/systeminfo.h>
	#include <sys/fm/util.h>
	#include <sys/fm/protocol.h>
	#include <sys/kstat.h>
	#include <sys/zfs_context.h>
	#ifdef _KERNEL
	#include <sys/atomic.h>
	#include <sys/condvar.h>
	#include <sys/zfs_ioctl.h>

	int zfs_zevent_len_max = 512;

	static int zevent_len_cur = 0;
	static int zevent_waiters = 0;
	static int zevent_flags = 0;

	/* Num events rate limited since the last time zfs_zevent_next() was called */
	static uint64_t ratelimit_dropped = 0;

	/*
	* The EID (Event IDentifier) is used to uniquely tag a zevent when it is
	* posted. The posted EIDs are monotonically increasing but not persistent.
	* They will be reset to the initial value (1) each time the kernel module is
	* loaded.
	*/
	static uint64_t zevent_eid = 0;

	static kmutex_t zevent_lock;
	static list_t zevent_list;
	static kcondvar_t zevent_cv;
	#endif /* _KERNEL */


	/*
	* Common fault management kstats to record event generation failures
	*/

	struct erpt_kstat {
	kstat_named_t erpt_dropped; /* num erpts dropped on post */
	kstat_named_t erpt_set_failed; /* num erpt set failures */
	kstat_named_t fmri_set_failed; /* num fmri set failures */
	kstat_named_t payload_set_failed; /* num payload set failures */
	kstat_named_t erpt_duplicates; /* num duplicate erpts */
	};

	static struct erpt_kstat erpt_kstat_data = {
	{ "erpt-dropped", KSTAT_DATA_UINT64 },
	{ "erpt-set-failed", KSTAT_DATA_UINT64 },
	{ "fmri-set-failed", KSTAT_DATA_UINT64 },
	{ "payload-set-failed", KSTAT_DATA_UINT64 },
	{ "erpt-duplicates", KSTAT_DATA_UINT64 }
	};

	kstat_t *fm_ksp;

	#ifdef _KERNEL

	static zevent_t *
	zfs_zevent_alloc(void)
	{
	zevent_t *ev;

	ev = kmem_zalloc(sizeof (zevent_t), KM_SLEEP);

	list_create(&ev->ev_ze_list, sizeof (zfs_zevent_t),
	offsetof(zfs_zevent_t, ze_node));
	list_link_init(&ev->ev_node);

	return (ev);
	}

	static void
	zfs_zevent_free(zevent_t *ev)
	{
	/* Run provided cleanup callback */
	ev->ev_cb(ev->ev_nvl, ev->ev_detector);

	list_destroy(&ev->ev_ze_list);
	kmem_free(ev, sizeof (zevent_t));
	}

	static void
	zfs_zevent_drain(zevent_t *ev)
	{
	zfs_zevent_t *ze;

	ASSERT(MUTEX_HELD(&zevent_lock));
	list_remove(&zevent_list, ev);

	/* Remove references to this event in all private file data */
	while ((ze = list_head(&ev->ev_ze_list)) != NULL) {
	list_remove(&ev->ev_ze_list, ze);
	ze->ze_zevent = NULL;
	ze->ze_dropped++;
	}

	zfs_zevent_free(ev);
	}

	void
	zfs_zevent_drain_all(int *count)
	{
	zevent_t *ev;

	mutex_enter(&zevent_lock);
	while ((ev = list_head(&zevent_list)) != NULL)
	zfs_zevent_drain(ev);

	*count = zevent_len_cur;
	zevent_len_cur = 0;
	mutex_exit(&zevent_lock);
	}

	/*
	* New zevents are inserted at the head. If the maximum queue
	* length is exceeded a zevent will be drained from the tail.
	* As part of this any user space processes which currently have
	* a reference to this zevent_t in their private data will have
	* this reference set to NULL.
	*/
	static void
	zfs_zevent_insert(zevent_t *ev)
	{
	ASSERT(MUTEX_HELD(&zevent_lock));
	list_insert_head(&zevent_list, ev);

	if (zevent_len_cur >= zfs_zevent_len_max)
	zfs_zevent_drain(list_tail(&zevent_list));
	else
	zevent_len_cur++;
	}

	/*
	* Post a zevent. The cb will be called when nvl and detector are no longer
	* needed, i.e.:
	* - An error happened and a zevent can't be posted. In this case, cb is called
	* before zfs_zevent_post() returns.
	* - The event is being drained and freed.
	*/
	int
	zfs_zevent_post(nvlist_t nvl, nvlist_t detector, zevent_cb_t *cb)
	{
	inode_timespec_t tv;
	int64_t tv_array[2];
	uint64_t eid;
	size_t nvl_size = 0;
	zevent_t *ev;
	int error;

	ASSERT(cb != NULL);

	gethrestime(&tv);
	tv_array[0] = tv.tv_sec;
	tv_array[1] = tv.tv_nsec;

	error = nvlist_add_int64_array(nvl, FM_EREPORT_TIME, tv_array, 2);
	if (error) {
	atomic_inc_64(&erpt_kstat_data.erpt_set_failed.value.ui64);
	goto out;
	}

	eid = atomic_inc_64_nv(&zevent_eid);
	error = nvlist_add_uint64(nvl, FM_EREPORT_EID, eid);
	if (error) {
	atomic_inc_64(&erpt_kstat_data.erpt_set_failed.value.ui64);
	goto out;
	}

	error = nvlist_size(nvl, &nvl_size, NV_ENCODE_NATIVE);
	if (error) {
	atomic_inc_64(&erpt_kstat_data.erpt_dropped.value.ui64);
	goto out;
	}

	if (nvl_size > ERPT_DATA_SZ \|\| nvl_size == 0) {
	atomic_inc_64(&erpt_kstat_data.erpt_dropped.value.ui64);
	error = EOVERFLOW;
	goto out;
	}

	ev = zfs_zevent_alloc();
	if (ev == NULL) {
	atomic_inc_64(&erpt_kstat_data.erpt_dropped.value.ui64);
	error = ENOMEM;
	goto out;
	}

	ev->ev_nvl = nvl;
	ev->ev_detector = detector;
	ev->ev_cb = cb;
	ev->ev_eid = eid;

	mutex_enter(&zevent_lock);
	zfs_zevent_insert(ev);
	cv_broadcast(&zevent_cv);
	mutex_exit(&zevent_lock);

	out:
	if (error)
	cb(nvl, detector);

	return (error);
	}

	void
	zfs_zevent_track_duplicate(void)
	{
	atomic_inc_64(&erpt_kstat_data.erpt_duplicates.value.ui64);
	}

	static int
	zfs_zevent_minor_to_state(minor_t minor, zfs_zevent_t **ze)
	{
	*ze = zfsdev_get_state(minor, ZST_ZEVENT);
	if (*ze == NULL)
	return (SET_ERROR(EBADF));

	return (0);
	}

	-int
	+zfs_file_t *
	zfs_zevent_fd_hold(int fd, minor_t minorp, zfs_zevent_t *ze)
	{
	- int error;
	+ zfs_file_t *fp = zfs_file_get(fd);
	+ if (fp == NULL)
	+ return (NULL);

	- error = zfsdev_getminor(fd, minorp);
	+ int error = zfsdev_getminor(fp, minorp);
	if (error == 0)
	error = zfs_zevent_minor_to_state(*minorp, ze);

	- if (error)
	- zfs_zevent_fd_rele(fd);
	+ if (error) {
	+ zfs_zevent_fd_rele(fp);
	+ fp = NULL;
	+ }

	- return (error);
	+ return (fp);
	}

	void
	-zfs_zevent_fd_rele(int fd)
	+zfs_zevent_fd_rele(zfs_file_t *fp)
	{
	- zfs_file_put(fd);
	+ zfs_file_put(fp);
	}

	/*
	* Get the next zevent in the stream and place a copy in 'event'. This
	* may fail with ENOMEM if the encoded nvlist size exceeds the passed
	* 'event_size'. In this case the stream pointer is not advanced and
	* and 'event_size' is set to the minimum required buffer size.
	*/
	int
	zfs_zevent_next(zfs_zevent_t ze, nvlist_t event, uint64_t event_size,
	uint64_t *dropped)
	{
	zevent_t *ev;
	size_t size;
	int error = 0;

	mutex_enter(&zevent_lock);
	if (ze->ze_zevent == NULL) {
	/* New stream start at the beginning/tail */
	ev = list_tail(&zevent_list);
	if (ev == NULL) {
	error = ENOENT;
	goto out;
	}
	} else {
	/*
	* Existing stream continue with the next element and remove
	* ourselves from the wait queue for the previous element
	*/
	ev = list_prev(&zevent_list, ze->ze_zevent);
	if (ev == NULL) {
	error = ENOENT;
	goto out;
	}
	}

	VERIFY(nvlist_size(ev->ev_nvl, &size, NV_ENCODE_NATIVE) == 0);
	if (size > *event_size) {
	*event_size = size;
	error = ENOMEM;
	goto out;
	}

	if (ze->ze_zevent)
	list_remove(&ze->ze_zevent->ev_ze_list, ze);

	ze->ze_zevent = ev;
	list_insert_head(&ev->ev_ze_list, ze);
	(void) nvlist_dup(ev->ev_nvl, event, KM_SLEEP);
	*dropped = ze->ze_dropped;

	#ifdef _KERNEL
	/* Include events dropped due to rate limiting */
	*dropped += atomic_swap_64(&ratelimit_dropped, 0);
	#endif
	ze->ze_dropped = 0;
	out:
	mutex_exit(&zevent_lock);

	return (error);
	}

	/*
	* Wait in an interruptible state for any new events.
	*/
	int
	zfs_zevent_wait(zfs_zevent_t *ze)
	{
	int error = EAGAIN;

	mutex_enter(&zevent_lock);
	zevent_waiters++;

	while (error == EAGAIN) {
	if (zevent_flags & ZEVENT_SHUTDOWN) {
	error = SET_ERROR(ESHUTDOWN);
	break;
	}

	error = cv_wait_sig(&zevent_cv, &zevent_lock);
	if (signal_pending(current)) {
	error = SET_ERROR(EINTR);
	break;
	} else if (!list_is_empty(&zevent_list)) {
	error = 0;
	continue;
	} else {
	error = EAGAIN;
	}
	}

	zevent_waiters--;
	mutex_exit(&zevent_lock);

	return (error);
	}

	/*
	* The caller may seek to a specific EID by passing that EID. If the EID
	* is still available in the posted list of events the cursor is positioned
	* there. Otherwise ENOENT is returned and the cursor is not moved.
	*
	* There are two reserved EIDs which may be passed and will never fail.
	* ZEVENT_SEEK_START positions the cursor at the start of the list, and
	* ZEVENT_SEEK_END positions the cursor at the end of the list.
	*/
	int
	zfs_zevent_seek(zfs_zevent_t *ze, uint64_t eid)
	{
	zevent_t *ev;
	int error = 0;

	mutex_enter(&zevent_lock);

	if (eid == ZEVENT_SEEK_START) {
	if (ze->ze_zevent)
	list_remove(&ze->ze_zevent->ev_ze_list, ze);

	ze->ze_zevent = NULL;
	goto out;
	}

	if (eid == ZEVENT_SEEK_END) {
	if (ze->ze_zevent)
	list_remove(&ze->ze_zevent->ev_ze_list, ze);

	ev = list_head(&zevent_list);
	if (ev) {
	ze->ze_zevent = ev;
	list_insert_head(&ev->ev_ze_list, ze);
	} else {
	ze->ze_zevent = NULL;
	}

	goto out;
	}

	for (ev = list_tail(&zevent_list); ev != NULL;
	ev = list_prev(&zevent_list, ev)) {
	if (ev->ev_eid == eid) {
	if (ze->ze_zevent)
	list_remove(&ze->ze_zevent->ev_ze_list, ze);

	ze->ze_zevent = ev;
	list_insert_head(&ev->ev_ze_list, ze);
	break;
	}
	}

	if (ev == NULL)
	error = ENOENT;

	out:
	mutex_exit(&zevent_lock);

	return (error);
	}

	void
	zfs_zevent_init(zfs_zevent_t **zep)
	{
	zfs_zevent_t *ze;

	ze = *zep = kmem_zalloc(sizeof (zfs_zevent_t), KM_SLEEP);
	list_link_init(&ze->ze_node);
	}

	void
	zfs_zevent_destroy(zfs_zevent_t *ze)
	{
	mutex_enter(&zevent_lock);
	if (ze->ze_zevent)
	list_remove(&ze->ze_zevent->ev_ze_list, ze);
	mutex_exit(&zevent_lock);

	kmem_free(ze, sizeof (zfs_zevent_t));
	}
	#endif /* _KERNEL */

	/*
	* Wrappers for FM nvlist allocators
	*/
	/* ARGSUSED */
	static void *
	i_fm_alloc(nv_alloc_t *nva, size_t size)
	{
	return (kmem_zalloc(size, KM_SLEEP));
	}

	/* ARGSUSED */
	static void
	i_fm_free(nv_alloc_t nva, void buf, size_t size)
	{
	kmem_free(buf, size);
	}

	const nv_alloc_ops_t fm_mem_alloc_ops = {
	.nv_ao_init = NULL,
	.nv_ao_fini = NULL,
	.nv_ao_alloc = i_fm_alloc,
	.nv_ao_free = i_fm_free,
	.nv_ao_reset = NULL
	};

	/*
	* Create and initialize a new nv_alloc_t for a fixed buffer, buf. A pointer
	* to the newly allocated nv_alloc_t structure is returned upon success or NULL
	* is returned to indicate that the nv_alloc structure could not be created.
	*/
	nv_alloc_t *
	fm_nva_xcreate(char *buf, size_t bufsz)
	{
	nv_alloc_t *nvhdl = kmem_zalloc(sizeof (nv_alloc_t), KM_SLEEP);

	if (bufsz == 0 \|\| nv_alloc_init(nvhdl, nv_fixed_ops, buf, bufsz) != 0) {
	kmem_free(nvhdl, sizeof (nv_alloc_t));
	return (NULL);
	}

	return (nvhdl);
	}

	/*
	* Destroy a previously allocated nv_alloc structure. The fixed buffer
	* associated with nva must be freed by the caller.
	*/
	void
	fm_nva_xdestroy(nv_alloc_t *nva)
	{
	nv_alloc_fini(nva);
	kmem_free(nva, sizeof (nv_alloc_t));
	}

	/*
	* Create a new nv list. A pointer to a new nv list structure is returned
	* upon success or NULL is returned to indicate that the structure could
	* not be created. The newly created nv list is created and managed by the
	* operations installed in nva. If nva is NULL, the default FMA nva
	* operations are installed and used.
	*
	* When called from the kernel and nva == NULL, this function must be called
	* from passive kernel context with no locks held that can prevent a
	* sleeping memory allocation from occurring. Otherwise, this function may
	* be called from other kernel contexts as long a valid nva created via
	* fm_nva_create() is supplied.
	*/
	nvlist_t *
	fm_nvlist_create(nv_alloc_t *nva)
	{
	int hdl_alloced = 0;
	nvlist_t *nvl;
	nv_alloc_t *nvhdl;

	if (nva == NULL) {
	nvhdl = kmem_zalloc(sizeof (nv_alloc_t), KM_SLEEP);

	if (nv_alloc_init(nvhdl, &fm_mem_alloc_ops, NULL, 0) != 0) {
	kmem_free(nvhdl, sizeof (nv_alloc_t));
	return (NULL);
	}
	hdl_alloced = 1;
	} else {
	nvhdl = nva;
	}

	if (nvlist_xalloc(&nvl, NV_UNIQUE_NAME, nvhdl) != 0) {
	if (hdl_alloced) {
	nv_alloc_fini(nvhdl);
	kmem_free(nvhdl, sizeof (nv_alloc_t));
	}
	return (NULL);
	}

	return (nvl);
	}

	/*
	* Destroy a previously allocated nvlist structure. flag indicates whether
	* or not the associated nva structure should be freed (FM_NVA_FREE) or
	* retained (FM_NVA_RETAIN). Retaining the nv alloc structure allows
	* it to be re-used for future nvlist creation operations.
	*/
	void
	fm_nvlist_destroy(nvlist_t *nvl, int flag)
	{
	nv_alloc_t *nva = nvlist_lookup_nv_alloc(nvl);

	nvlist_free(nvl);

	if (nva != NULL) {
	if (flag == FM_NVA_FREE)
	fm_nva_xdestroy(nva);
	}
	}

	int
	i_fm_payload_set(nvlist_t payload, const char name, va_list ap)
	{
	int nelem, ret = 0;
	data_type_t type;

	while (ret == 0 && name != NULL) {
	type = va_arg(ap, data_type_t);
	switch (type) {
	case DATA_TYPE_BYTE:
	ret = nvlist_add_byte(payload, name,
	va_arg(ap, uint_t));
	break;
	case DATA_TYPE_BYTE_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_byte_array(payload, name,
	va_arg(ap, uchar_t *), nelem);
	break;
	case DATA_TYPE_BOOLEAN_VALUE:
	ret = nvlist_add_boolean_value(payload, name,
	va_arg(ap, boolean_t));
	break;
	case DATA_TYPE_BOOLEAN_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_boolean_array(payload, name,
	va_arg(ap, boolean_t *), nelem);
	break;
	case DATA_TYPE_INT8:
	ret = nvlist_add_int8(payload, name,
	va_arg(ap, int));
	break;
	case DATA_TYPE_INT8_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_int8_array(payload, name,
	va_arg(ap, int8_t *), nelem);
	break;
	case DATA_TYPE_UINT8:
	ret = nvlist_add_uint8(payload, name,
	va_arg(ap, uint_t));
	break;
	case DATA_TYPE_UINT8_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_uint8_array(payload, name,
	va_arg(ap, uint8_t *), nelem);
	break;
	case DATA_TYPE_INT16:
	ret = nvlist_add_int16(payload, name,
	va_arg(ap, int));
	break;
	case DATA_TYPE_INT16_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_int16_array(payload, name,
	va_arg(ap, int16_t *), nelem);
	break;
	case DATA_TYPE_UINT16:
	ret = nvlist_add_uint16(payload, name,
	va_arg(ap, uint_t));
	break;
	case DATA_TYPE_UINT16_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_uint16_array(payload, name,
	va_arg(ap, uint16_t *), nelem);
	break;
	case DATA_TYPE_INT32:
	ret = nvlist_add_int32(payload, name,
	va_arg(ap, int32_t));
	break;
	case DATA_TYPE_INT32_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_int32_array(payload, name,
	va_arg(ap, int32_t *), nelem);
	break;
	case DATA_TYPE_UINT32:
	ret = nvlist_add_uint32(payload, name,
	va_arg(ap, uint32_t));
	break;
	case DATA_TYPE_UINT32_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_uint32_array(payload, name,
	va_arg(ap, uint32_t *), nelem);
	break;
	case DATA_TYPE_INT64:
	ret = nvlist_add_int64(payload, name,
	va_arg(ap, int64_t));
	break;
	case DATA_TYPE_INT64_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_int64_array(payload, name,
	va_arg(ap, int64_t *), nelem);
	break;
	case DATA_TYPE_UINT64:
	ret = nvlist_add_uint64(payload, name,
	va_arg(ap, uint64_t));
	break;
	case DATA_TYPE_UINT64_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_uint64_array(payload, name,
	va_arg(ap, uint64_t *), nelem);
	break;
	case DATA_TYPE_STRING:
	ret = nvlist_add_string(payload, name,
	va_arg(ap, char *));
	break;
	case DATA_TYPE_STRING_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_string_array(payload, name,
	va_arg(ap, char **), nelem);
	break;
	case DATA_TYPE_NVLIST:
	ret = nvlist_add_nvlist(payload, name,
	va_arg(ap, nvlist_t *));
	break;
	case DATA_TYPE_NVLIST_ARRAY:
	nelem = va_arg(ap, int);
	ret = nvlist_add_nvlist_array(payload, name,
	va_arg(ap, nvlist_t **), nelem);
	break;
	default:
	ret = EINVAL;
	}

	name = va_arg(ap, char *);
	}
	return (ret);
	}

	void
	fm_payload_set(nvlist_t *payload, ...)
	{
	int ret;
	const char *name;
	va_list ap;

	va_start(ap, payload);
	name = va_arg(ap, char *);
	ret = i_fm_payload_set(payload, name, ap);
	va_end(ap);

	if (ret)
	atomic_inc_64(&erpt_kstat_data.payload_set_failed.value.ui64);
	}

	/*
	* Set-up and validate the members of an ereport event according to:
	*
	* Member name Type Value
	* ====================================================
	* class string ereport
	* version uint8_t 0
	* ena uint64_t <ena>
	* detector nvlist_t <detector>
	* ereport-payload nvlist_t <var args>
	*
	* We don't actually add a 'version' member to the payload. Really,
	* the version quoted to us by our caller is that of the category 1
	* "ereport" event class (and we require FM_EREPORT_VERS0) but
	* the payload version of the actual leaf class event under construction
	* may be something else. Callers should supply a version in the varargs,
	* or (better) we could take two version arguments - one for the
	* ereport category 1 classification (expect FM_EREPORT_VERS0) and one
	* for the leaf class.
	*/
	void
	fm_ereport_set(nvlist_t ereport, int version, const char erpt_class,
	uint64_t ena, const nvlist_t *detector, ...)
	{
	char ereport_class[FM_MAX_CLASS];
	const char *name;
	va_list ap;
	int ret;

	if (version != FM_EREPORT_VERS0) {
	atomic_inc_64(&erpt_kstat_data.erpt_set_failed.value.ui64);
	return;
	}

	(void) snprintf(ereport_class, FM_MAX_CLASS, "%s.%s",
	FM_EREPORT_CLASS, erpt_class);
	if (nvlist_add_string(ereport, FM_CLASS, ereport_class) != 0) {
	atomic_inc_64(&erpt_kstat_data.erpt_set_failed.value.ui64);
	return;
	}

	if (nvlist_add_uint64(ereport, FM_EREPORT_ENA, ena)) {
	atomic_inc_64(&erpt_kstat_data.erpt_set_failed.value.ui64);
	}

	if (nvlist_add_nvlist(ereport, FM_EREPORT_DETECTOR,
	(nvlist_t *)detector) != 0) {
	atomic_inc_64(&erpt_kstat_data.erpt_set_failed.value.ui64);
	}

	va_start(ap, detector);
	name = va_arg(ap, const char *);
	ret = i_fm_payload_set(ereport, name, ap);
	va_end(ap);

	if (ret)
	atomic_inc_64(&erpt_kstat_data.erpt_set_failed.value.ui64);
	}

	/*
	* Set-up and validate the members of an hc fmri according to;
	*
	* Member name Type Value
	* ===================================================
	* version uint8_t 0
	* auth nvlist_t <auth>
	* hc-name string <name>
	* hc-id string <id>
	*
	* Note that auth and hc-id are optional members.
	*/

	#define HC_MAXPAIRS 20
	#define HC_MAXNAMELEN 50

	static int
	fm_fmri_hc_set_common(nvlist_t fmri, int version, const nvlist_t auth)
	{
	if (version != FM_HC_SCHEME_VERSION) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return (0);
	}

	if (nvlist_add_uint8(fmri, FM_VERSION, version) != 0 \|\|
	nvlist_add_string(fmri, FM_FMRI_SCHEME, FM_FMRI_SCHEME_HC) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return (0);
	}

	if (auth != NULL && nvlist_add_nvlist(fmri, FM_FMRI_AUTHORITY,
	(nvlist_t *)auth) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return (0);
	}

	return (1);
	}

	void
	fm_fmri_hc_set(nvlist_t fmri, int version, const nvlist_t auth,
	nvlist_t *snvl, int npairs, ...)
	{
	nv_alloc_t *nva = nvlist_lookup_nv_alloc(fmri);
	nvlist_t *pairs[HC_MAXPAIRS];
	va_list ap;
	int i;

	if (!fm_fmri_hc_set_common(fmri, version, auth))
	return;

	npairs = MIN(npairs, HC_MAXPAIRS);

	va_start(ap, npairs);
	for (i = 0; i < npairs; i++) {
	const char name = va_arg(ap, const char );
	uint32_t id = va_arg(ap, uint32_t);
	char idstr[11];

	(void) snprintf(idstr, sizeof (idstr), "%u", id);

	pairs[i] = fm_nvlist_create(nva);
	if (nvlist_add_string(pairs[i], FM_FMRI_HC_NAME, name) != 0 \|\|
	nvlist_add_string(pairs[i], FM_FMRI_HC_ID, idstr) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	}
	}
	va_end(ap);

	if (nvlist_add_nvlist_array(fmri, FM_FMRI_HC_LIST, pairs, npairs) != 0)
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);

	for (i = 0; i < npairs; i++)
	fm_nvlist_destroy(pairs[i], FM_NVA_RETAIN);

	if (snvl != NULL) {
	if (nvlist_add_nvlist(fmri, FM_FMRI_HC_SPECIFIC, snvl) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	}
	}
	}

	void
	fm_fmri_hc_create(nvlist_t fmri, int version, const nvlist_t auth,
	nvlist_t snvl, nvlist_t bboard, int npairs, ...)
	{
	nv_alloc_t *nva = nvlist_lookup_nv_alloc(fmri);
	nvlist_t *pairs[HC_MAXPAIRS];
	nvlist_t **hcl;
	uint_t n;
	int i, j;
	va_list ap;
	char hcname, hcid;

	if (!fm_fmri_hc_set_common(fmri, version, auth))
	return;

	/*
	* copy the bboard nvpairs to the pairs array
	*/
	if (nvlist_lookup_nvlist_array(bboard, FM_FMRI_HC_LIST, &hcl, &n)
	!= 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	for (i = 0; i < n; i++) {
	if (nvlist_lookup_string(hcl[i], FM_FMRI_HC_NAME,
	&hcname) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}
	if (nvlist_lookup_string(hcl[i], FM_FMRI_HC_ID, &hcid) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	pairs[i] = fm_nvlist_create(nva);
	if (nvlist_add_string(pairs[i], FM_FMRI_HC_NAME, hcname) != 0 \|\|
	nvlist_add_string(pairs[i], FM_FMRI_HC_ID, hcid) != 0) {
	for (j = 0; j <= i; j++) {
	if (pairs[j] != NULL)
	fm_nvlist_destroy(pairs[j],
	FM_NVA_RETAIN);
	}
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}
	}

	/*
	* create the pairs from passed in pairs
	*/
	npairs = MIN(npairs, HC_MAXPAIRS);

	va_start(ap, npairs);
	for (i = n; i < npairs + n; i++) {
	const char name = va_arg(ap, const char );
	uint32_t id = va_arg(ap, uint32_t);
	char idstr[11];
	(void) snprintf(idstr, sizeof (idstr), "%u", id);
	pairs[i] = fm_nvlist_create(nva);
	if (nvlist_add_string(pairs[i], FM_FMRI_HC_NAME, name) != 0 \|\|
	nvlist_add_string(pairs[i], FM_FMRI_HC_ID, idstr) != 0) {
	for (j = 0; j <= i; j++) {
	if (pairs[j] != NULL)
	fm_nvlist_destroy(pairs[j],
	FM_NVA_RETAIN);
	}
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}
	}
	va_end(ap);

	/*
	* Create the fmri hc list
	*/
	if (nvlist_add_nvlist_array(fmri, FM_FMRI_HC_LIST, pairs,
	npairs + n) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	for (i = 0; i < npairs + n; i++) {
	fm_nvlist_destroy(pairs[i], FM_NVA_RETAIN);
	}

	if (snvl != NULL) {
	if (nvlist_add_nvlist(fmri, FM_FMRI_HC_SPECIFIC, snvl) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}
	}
	}

	/*
	* Set-up and validate the members of an dev fmri according to:
	*
	* Member name Type Value
	* ====================================================
	* version uint8_t 0
	* auth nvlist_t <auth>
	* devpath string <devpath>
	* [devid] string <devid>
	* [target-port-l0id] string <target-port-lun0-id>
	*
	* Note that auth and devid are optional members.
	*/
	void
	fm_fmri_dev_set(nvlist_t fmri_dev, int version, const nvlist_t auth,
	const char devpath, const char devid, const char *tpl0)
	{
	int err = 0;

	if (version != DEV_SCHEME_VERSION0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	err \|= nvlist_add_uint8(fmri_dev, FM_VERSION, version);
	err \|= nvlist_add_string(fmri_dev, FM_FMRI_SCHEME, FM_FMRI_SCHEME_DEV);

	if (auth != NULL) {
	err \|= nvlist_add_nvlist(fmri_dev, FM_FMRI_AUTHORITY,
	(nvlist_t *)auth);
	}

	err \|= nvlist_add_string(fmri_dev, FM_FMRI_DEV_PATH, devpath);

	if (devid != NULL)
	err \|= nvlist_add_string(fmri_dev, FM_FMRI_DEV_ID, devid);

	if (tpl0 != NULL)
	err \|= nvlist_add_string(fmri_dev, FM_FMRI_DEV_TGTPTLUN0, tpl0);

	if (err)
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);

	}

	/*
	* Set-up and validate the members of an cpu fmri according to:
	*
	* Member name Type Value
	* ====================================================
	* version uint8_t 0
	* auth nvlist_t <auth>
	* cpuid uint32_t <cpu_id>
	* cpumask uint8_t <cpu_mask>
	* serial uint64_t <serial_id>
	*
	* Note that auth, cpumask, serial are optional members.
	*
	*/
	void
	fm_fmri_cpu_set(nvlist_t fmri_cpu, int version, const nvlist_t auth,
	uint32_t cpu_id, uint8_t cpu_maskp, const char serial_idp)
	{
	uint64_t *failedp = &erpt_kstat_data.fmri_set_failed.value.ui64;

	if (version < CPU_SCHEME_VERSION1) {
	atomic_inc_64(failedp);
	return;
	}

	if (nvlist_add_uint8(fmri_cpu, FM_VERSION, version) != 0) {
	atomic_inc_64(failedp);
	return;
	}

	if (nvlist_add_string(fmri_cpu, FM_FMRI_SCHEME,
	FM_FMRI_SCHEME_CPU) != 0) {
	atomic_inc_64(failedp);
	return;
	}

	if (auth != NULL && nvlist_add_nvlist(fmri_cpu, FM_FMRI_AUTHORITY,
	(nvlist_t *)auth) != 0)
	atomic_inc_64(failedp);

	if (nvlist_add_uint32(fmri_cpu, FM_FMRI_CPU_ID, cpu_id) != 0)
	atomic_inc_64(failedp);

	if (cpu_maskp != NULL && nvlist_add_uint8(fmri_cpu, FM_FMRI_CPU_MASK,
	*cpu_maskp) != 0)
	atomic_inc_64(failedp);

	if (serial_idp == NULL \|\| nvlist_add_string(fmri_cpu,
	FM_FMRI_CPU_SERIAL_ID, (char *)serial_idp) != 0)
	atomic_inc_64(failedp);
	}

	/*
	* Set-up and validate the members of a mem according to:
	*
	* Member name Type Value
	* ====================================================
	* version uint8_t 0
	* auth nvlist_t <auth> [optional]
	* unum string <unum>
	* serial string <serial> [optional*]
	* offset uint64_t <offset> [optional]
	*
	* * serial is required if offset is present
	*/
	void
	fm_fmri_mem_set(nvlist_t fmri, int version, const nvlist_t auth,
	const char unum, const char serial, uint64_t offset)
	{
	if (version != MEM_SCHEME_VERSION0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	if (!serial && (offset != (uint64_t)-1)) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	if (nvlist_add_uint8(fmri, FM_VERSION, version) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	if (nvlist_add_string(fmri, FM_FMRI_SCHEME, FM_FMRI_SCHEME_MEM) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	if (auth != NULL) {
	if (nvlist_add_nvlist(fmri, FM_FMRI_AUTHORITY,
	(nvlist_t *)auth) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	}
	}

	if (nvlist_add_string(fmri, FM_FMRI_MEM_UNUM, unum) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	}

	if (serial != NULL) {
	if (nvlist_add_string_array(fmri, FM_FMRI_MEM_SERIAL_ID,
	(char **)&serial, 1) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	}
	if (offset != (uint64_t)-1 && nvlist_add_uint64(fmri,
	FM_FMRI_MEM_OFFSET, offset) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	}
	}
	}

	void
	fm_fmri_zfs_set(nvlist_t *fmri, int version, uint64_t pool_guid,
	uint64_t vdev_guid)
	{
	if (version != ZFS_SCHEME_VERSION0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	if (nvlist_add_uint8(fmri, FM_VERSION, version) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	if (nvlist_add_string(fmri, FM_FMRI_SCHEME, FM_FMRI_SCHEME_ZFS) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	return;
	}

	if (nvlist_add_uint64(fmri, FM_FMRI_ZFS_POOL, pool_guid) != 0) {
	atomic_inc_64(&erpt_kstat_data.fmri_set_failed.value.ui64);
	}

	if (vdev_guid != 0) {
	if (nvlist_add_uint64(fmri, FM_FMRI_ZFS_VDEV, vdev_guid) != 0) {
	atomic_inc_64(
	&erpt_kstat_data.fmri_set_failed.value.ui64);
	}
	}
	}

	uint64_t
	fm_ena_increment(uint64_t ena)
	{
	uint64_t new_ena;

	switch (ENA_FORMAT(ena)) {
	case FM_ENA_FMT1:
	new_ena = ena + (1 << ENA_FMT1_GEN_SHFT);
	break;
	case FM_ENA_FMT2:
	new_ena = ena + (1 << ENA_FMT2_GEN_SHFT);
	break;
	default:
	new_ena = 0;
	}

	return (new_ena);
	}

	uint64_t
	fm_ena_generate_cpu(uint64_t timestamp, processorid_t cpuid, uchar_t format)
	{
	uint64_t ena = 0;

	switch (format) {
	case FM_ENA_FMT1:
	if (timestamp) {
	ena = (uint64_t)((format & ENA_FORMAT_MASK) \|
	((cpuid << ENA_FMT1_CPUID_SHFT) &
	ENA_FMT1_CPUID_MASK) \|
	((timestamp << ENA_FMT1_TIME_SHFT) &
	ENA_FMT1_TIME_MASK));
	} else {
	ena = (uint64_t)((format & ENA_FORMAT_MASK) \|
	((cpuid << ENA_FMT1_CPUID_SHFT) &
	ENA_FMT1_CPUID_MASK) \|
	((gethrtime() << ENA_FMT1_TIME_SHFT) &
	ENA_FMT1_TIME_MASK));
	}
	break;
	case FM_ENA_FMT2:
	ena = (uint64_t)((format & ENA_FORMAT_MASK) \|
	((timestamp << ENA_FMT2_TIME_SHFT) & ENA_FMT2_TIME_MASK));
	break;
	default:
	break;
	}

	return (ena);
	}

	uint64_t
	fm_ena_generate(uint64_t timestamp, uchar_t format)
	{
	uint64_t ena;

	kpreempt_disable();
	ena = fm_ena_generate_cpu(timestamp, getcpuid(), format);
	kpreempt_enable();

	return (ena);
	}

	uint64_t
	fm_ena_generation_get(uint64_t ena)
	{
	uint64_t gen;

	switch (ENA_FORMAT(ena)) {
	case FM_ENA_FMT1:
	gen = (ena & ENA_FMT1_GEN_MASK) >> ENA_FMT1_GEN_SHFT;
	break;
	case FM_ENA_FMT2:
	gen = (ena & ENA_FMT2_GEN_MASK) >> ENA_FMT2_GEN_SHFT;
	break;
	default:
	gen = 0;
	break;
	}

	return (gen);
	}

	uchar_t
	fm_ena_format_get(uint64_t ena)
	{

	return (ENA_FORMAT(ena));
	}

	uint64_t
	fm_ena_id_get(uint64_t ena)
	{
	uint64_t id;

	switch (ENA_FORMAT(ena)) {
	case FM_ENA_FMT1:
	id = (ena & ENA_FMT1_ID_MASK) >> ENA_FMT1_ID_SHFT;
	break;
	case FM_ENA_FMT2:
	id = (ena & ENA_FMT2_ID_MASK) >> ENA_FMT2_ID_SHFT;
	break;
	default:
	id = 0;
	}

	return (id);
	}

	uint64_t
	fm_ena_time_get(uint64_t ena)
	{
	uint64_t time;

	switch (ENA_FORMAT(ena)) {
	case FM_ENA_FMT1:
	time = (ena & ENA_FMT1_TIME_MASK) >> ENA_FMT1_TIME_SHFT;
	break;
	case FM_ENA_FMT2:
	time = (ena & ENA_FMT2_TIME_MASK) >> ENA_FMT2_TIME_SHFT;
	break;
	default:
	time = 0;
	}

	return (time);
	}

	#ifdef _KERNEL
	/*
	* Helper function to increment ereport dropped count. Used by the event
	* rate limiting code to give feedback to the user about how many events were
	* rate limited by including them in the 'dropped' count.
	*/
	void
	fm_erpt_dropped_increment(void)
	{
	atomic_inc_64(&ratelimit_dropped);
	}

	void
	fm_init(void)
	{
	zevent_len_cur = 0;
	zevent_flags = 0;

	/* Initialize zevent allocation and generation kstats */
	fm_ksp = kstat_create("zfs", 0, "fm", "misc", KSTAT_TYPE_NAMED,
	sizeof (struct erpt_kstat) / sizeof (kstat_named_t),
	KSTAT_FLAG_VIRTUAL);

	if (fm_ksp != NULL) {
	fm_ksp->ks_data = &erpt_kstat_data;
	kstat_install(fm_ksp);
	} else {
	cmn_err(CE_NOTE, "failed to create fm/misc kstat\n");
	}

	mutex_init(&zevent_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&zevent_list, sizeof (zevent_t),
	offsetof(zevent_t, ev_node));
	cv_init(&zevent_cv, NULL, CV_DEFAULT, NULL);

	zfs_ereport_init();
	}

	void
	fm_fini(void)
	{
	int count;

	zfs_ereport_fini();

	zfs_zevent_drain_all(&count);

	mutex_enter(&zevent_lock);
	cv_broadcast(&zevent_cv);

	zevent_flags \|= ZEVENT_SHUTDOWN;
	while (zevent_waiters > 0) {
	mutex_exit(&zevent_lock);
	schedule();
	mutex_enter(&zevent_lock);
	}
	mutex_exit(&zevent_lock);

	cv_destroy(&zevent_cv);
	list_destroy(&zevent_list);
	mutex_destroy(&zevent_lock);

	if (fm_ksp != NULL) {
	kstat_delete(fm_ksp);
	fm_ksp = NULL;
	}
	}
	#endif /* _KERNEL */

	ZFS_MODULE_PARAM(zfs_zevent, zfs_zevent_, len_max, INT, ZMOD_RW,
	"Max event queue length");
	diff --git a/sys/contrib/openzfs/module/zfs/metaslab.c b/sys/contrib/openzfs/module/zfs/metaslab.c
	index 08d7a5635425..df0d83327c0b 100644
	--- a/sys/contrib/openzfs/module/zfs/metaslab.c
	+++ b/sys/contrib/openzfs/module/zfs/metaslab.c
	@@ -1,6262 +1,6257 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
	* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	* Copyright (c) 2015, Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2017, Intel Corporation.
	*/

	#include <sys/zfs_context.h>
	#include <sys/dmu.h>
	#include <sys/dmu_tx.h>
	#include <sys/space_map.h>
	#include <sys/metaslab_impl.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_draid.h>
	#include <sys/zio.h>
	#include <sys/spa_impl.h>
	#include <sys/zfeature.h>
	#include <sys/vdev_indirect_mapping.h>
	#include <sys/zap.h>
	#include <sys/btree.h>

	#define WITH_DF_BLOCK_ALLOCATOR

	#define GANG_ALLOCATION(flags) \
	((flags) & (METASLAB_GANG_CHILD \| METASLAB_GANG_HEADER))

	/*
	* Metaslab granularity, in bytes. This is roughly similar to what would be
	* referred to as the "stripe size" in traditional RAID arrays. In normal
	* operation, we will try to write this amount of data to a top-level vdev
	* before moving on to the next one.
	*/
	unsigned long metaslab_aliquot = 512 << 10;

	/*
	* For testing, make some blocks above a certain size be gang blocks.
	*/
	unsigned long metaslab_force_ganging = SPA_MAXBLOCKSIZE + 1;

	/*
	* In pools where the log space map feature is not enabled we touch
	* multiple metaslabs (and their respective space maps) with each
	* transaction group. Thus, we benefit from having a small space map
	* block size since it allows us to issue more I/O operations scattered
	* around the disk. So a sane default for the space map block size
	* is 8~16K.
	*/
	int zfs_metaslab_sm_blksz_no_log = (1 << 14);

	/*
	* When the log space map feature is enabled, we accumulate a lot of
	* changes per metaslab that are flushed once in a while so we benefit
	* from a bigger block size like 128K for the metaslab space maps.
	*/
	int zfs_metaslab_sm_blksz_with_log = (1 << 17);

	/*
	* The in-core space map representation is more compact than its on-disk form.
	* The zfs_condense_pct determines how much more compact the in-core
	* space map representation must be before we compact it on-disk.
	* Values should be greater than or equal to 100.
	*/
	int zfs_condense_pct = 200;

	/*
	* Condensing a metaslab is not guaranteed to actually reduce the amount of
	* space used on disk. In particular, a space map uses data in increments of
	* MAX(1 << ashift, space_map_blksz), so a metaslab might use the
	* same number of blocks after condensing. Since the goal of condensing is to
	* reduce the number of IOPs required to read the space map, we only want to
	* condense when we can be sure we will reduce the number of blocks used by the
	* space map. Unfortunately, we cannot precisely compute whether or not this is
	* the case in metaslab_should_condense since we are holding ms_lock. Instead,
	* we apply the following heuristic: do not condense a spacemap unless the
	* uncondensed size consumes greater than zfs_metaslab_condense_block_threshold
	* blocks.
	*/
	int zfs_metaslab_condense_block_threshold = 4;

	/*
	* The zfs_mg_noalloc_threshold defines which metaslab groups should
	* be eligible for allocation. The value is defined as a percentage of
	* free space. Metaslab groups that have more free space than
	* zfs_mg_noalloc_threshold are always eligible for allocations. Once
	* a metaslab group's free space is less than or equal to the
	* zfs_mg_noalloc_threshold the allocator will avoid allocating to that
	* group unless all groups in the pool have reached zfs_mg_noalloc_threshold.
	* Once all groups in the pool reach zfs_mg_noalloc_threshold then all
	* groups are allowed to accept allocations. Gang blocks are always
	* eligible to allocate on any metaslab group. The default value of 0 means
	* no metaslab group will be excluded based on this criterion.
	*/
	int zfs_mg_noalloc_threshold = 0;

	/*
	* Metaslab groups are considered eligible for allocations if their
	* fragmentation metric (measured as a percentage) is less than or
	* equal to zfs_mg_fragmentation_threshold. If a metaslab group
	* exceeds this threshold then it will be skipped unless all metaslab
	* groups within the metaslab class have also crossed this threshold.
	*
	* This tunable was introduced to avoid edge cases where we continue
	* allocating from very fragmented disks in our pool while other, less
	* fragmented disks, exists. On the other hand, if all disks in the
	* pool are uniformly approaching the threshold, the threshold can
	* be a speed bump in performance, where we keep switching the disks
	* that we allocate from (e.g. we allocate some segments from disk A
	* making it bypassing the threshold while freeing segments from disk
	* B getting its fragmentation below the threshold).
	*
	* Empirically, we've seen that our vdev selection for allocations is
	* good enough that fragmentation increases uniformly across all vdevs
	* the majority of the time. Thus we set the threshold percentage high
	* enough to avoid hitting the speed bump on pools that are being pushed
	* to the edge.
	*/
	int zfs_mg_fragmentation_threshold = 95;

	/*
	* Allow metaslabs to keep their active state as long as their fragmentation
	* percentage is less than or equal to zfs_metaslab_fragmentation_threshold. An
	* active metaslab that exceeds this threshold will no longer keep its active
	* status allowing better metaslabs to be selected.
	*/
	int zfs_metaslab_fragmentation_threshold = 70;

	/*
	* When set will load all metaslabs when pool is first opened.
	*/
	int metaslab_debug_load = 0;

	/*
	* When set will prevent metaslabs from being unloaded.
	*/
	int metaslab_debug_unload = 0;

	/*
	* Minimum size which forces the dynamic allocator to change
	* it's allocation strategy. Once the space map cannot satisfy
	* an allocation of this size then it switches to using more
	* aggressive strategy (i.e search by size rather than offset).
	*/
	uint64_t metaslab_df_alloc_threshold = SPA_OLD_MAXBLOCKSIZE;

	/*
	* The minimum free space, in percent, which must be available
	* in a space map to continue allocations in a first-fit fashion.
	* Once the space map's free space drops below this level we dynamically
	* switch to using best-fit allocations.
	*/
	int metaslab_df_free_pct = 4;

	/*
	* Maximum distance to search forward from the last offset. Without this
	* limit, fragmented pools can see >100,000 iterations and
	* metaslab_block_picker() becomes the performance limiting factor on
	* high-performance storage.
	*
	* With the default setting of 16MB, we typically see less than 500
	* iterations, even with very fragmented, ashift=9 pools. The maximum number
	* of iterations possible is:
	* metaslab_df_max_search / (2 * (1<<ashift))
	* With the default setting of 16MB this is 16*1024 (with ashift=9) or
	* 2048 (with ashift=12).
	*/
	int metaslab_df_max_search = 16 * 1024 * 1024;

	/*
	* Forces the metaslab_block_picker function to search for at least this many
	* segments forwards until giving up on finding a segment that the allocation
	* will fit into.
	*/
	uint32_t metaslab_min_search_count = 100;

	/*
	* If we are not searching forward (due to metaslab_df_max_search,
	* metaslab_df_free_pct, or metaslab_df_alloc_threshold), this tunable
	* controls what segment is used. If it is set, we will use the largest free
	* segment. If it is not set, we will use a segment of exactly the requested
	* size (or larger).
	*/
	int metaslab_df_use_largest_segment = B_FALSE;

	/*
	* Percentage of all cpus that can be used by the metaslab taskq.
	*/
	int metaslab_load_pct = 50;

	/*
	* These tunables control how long a metaslab will remain loaded after the
	* last allocation from it. A metaslab can't be unloaded until at least
	* metaslab_unload_delay TXG's and metaslab_unload_delay_ms milliseconds
	* have elapsed. However, zfs_metaslab_mem_limit may cause it to be
	* unloaded sooner. These settings are intended to be generous -- to keep
	* metaslabs loaded for a long time, reducing the rate of metaslab loading.
	*/
	int metaslab_unload_delay = 32;
	int metaslab_unload_delay_ms = 10 * 60 * 1000; /* ten minutes */

	/*
	* Max number of metaslabs per group to preload.
	*/
	int metaslab_preload_limit = 10;

	/*
	* Enable/disable preloading of metaslab.
	*/
	int metaslab_preload_enabled = B_TRUE;

	/*
	* Enable/disable fragmentation weighting on metaslabs.
	*/
	int metaslab_fragmentation_factor_enabled = B_TRUE;

	/*
	* Enable/disable lba weighting (i.e. outer tracks are given preference).
	*/
	int metaslab_lba_weighting_enabled = B_TRUE;

	/*
	* Enable/disable metaslab group biasing.
	*/
	int metaslab_bias_enabled = B_TRUE;

	/*
	* Enable/disable remapping of indirect DVAs to their concrete vdevs.
	*/
	boolean_t zfs_remap_blkptr_enable = B_TRUE;

	/*
	* Enable/disable segment-based metaslab selection.
	*/
	int zfs_metaslab_segment_weight_enabled = B_TRUE;

	/*
	* When using segment-based metaslab selection, we will continue
	* allocating from the active metaslab until we have exhausted
	* zfs_metaslab_switch_threshold of its buckets.
	*/
	int zfs_metaslab_switch_threshold = 2;

	/*
	* Internal switch to enable/disable the metaslab allocation tracing
	* facility.
	*/
	boolean_t metaslab_trace_enabled = B_FALSE;

	/*
	* Maximum entries that the metaslab allocation tracing facility will keep
	* in a given list when running in non-debug mode. We limit the number
	* of entries in non-debug mode to prevent us from using up too much memory.
	* The limit should be sufficiently large that we don't expect any allocation
	* to every exceed this value. In debug mode, the system will panic if this
	* limit is ever reached allowing for further investigation.
	*/
	uint64_t metaslab_trace_max_entries = 5000;

	/*
	* Maximum number of metaslabs per group that can be disabled
	* simultaneously.
	*/
	int max_disabled_ms = 3;

	/*
	* Time (in seconds) to respect ms_max_size when the metaslab is not loaded.
	* To avoid 64-bit overflow, don't set above UINT32_MAX.
	*/
	unsigned long zfs_metaslab_max_size_cache_sec = 3600; /* 1 hour */

	/*
	* Maximum percentage of memory to use on storing loaded metaslabs. If loading
	* a metaslab would take it over this percentage, the oldest selected metaslab
	* is automatically unloaded.
	*/
	int zfs_metaslab_mem_limit = 25;

	/*
	* Force the per-metaslab range trees to use 64-bit integers to store
	* segments. Used for debugging purposes.
	*/
	boolean_t zfs_metaslab_force_large_segs = B_FALSE;

	/*
	* By default we only store segments over a certain size in the size-sorted
	* metaslab trees (ms_allocatable_by_size and
	* ms_unflushed_frees_by_size). This dramatically reduces memory usage and
	* improves load and unload times at the cost of causing us to use slightly
	* larger segments than we would otherwise in some cases.
	*/
	uint32_t metaslab_by_size_min_shift = 14;

	/*
	* If not set, we will first try normal allocation. If that fails then
	* we will do a gang allocation. If that fails then we will do a "try hard"
	* gang allocation. If that fails then we will have a multi-layer gang
	* block.
	*
	* If set, we will first try normal allocation. If that fails then
	* we will do a "try hard" allocation. If that fails we will do a gang
	* allocation. If that fails we will do a "try hard" gang allocation. If
	* that fails then we will have a multi-layer gang block.
	*/
	int zfs_metaslab_try_hard_before_gang = B_FALSE;

	/*
	* When not trying hard, we only consider the best zfs_metaslab_find_max_tries
	* metaslabs. This improves performance, especially when there are many
	* metaslabs per vdev and the allocation can't actually be satisfied (so we
	* would otherwise iterate all the metaslabs). If there is a metaslab with a
	* worse weight but it can actually satisfy the allocation, we won't find it
	* until trying hard. This may happen if the worse metaslab is not loaded
	* (and the true weight is better than we have calculated), or due to weight
	* bucketization. E.g. we are looking for a 60K segment, and the best
	* metaslabs all have free segments in the 32-63K bucket, but the best
	* zfs_metaslab_find_max_tries metaslabs have ms_max_size <60KB, and a
	* subsequent metaslab has ms_max_size >60KB (but fewer segments in this
	* bucket, and therefore a lower weight).
	*/
	int zfs_metaslab_find_max_tries = 100;

	static uint64_t metaslab_weight(metaslab_t *, boolean_t);
	static void metaslab_set_fragmentation(metaslab_t *, boolean_t);
	static void metaslab_free_impl(vdev_t *, uint64_t, uint64_t, boolean_t);
	static void metaslab_check_free_impl(vdev_t *, uint64_t, uint64_t);

	static void metaslab_passivate(metaslab_t *msp, uint64_t weight);
	static uint64_t metaslab_weight_from_range_tree(metaslab_t *msp);
	static void metaslab_flush_update(metaslab_t , dmu_tx_t );
	static unsigned int metaslab_idx_func(multilist_t , void );
	static void metaslab_evict(metaslab_t *, uint64_t);
	static void metaslab_rt_add(range_tree_t rt, range_seg_t rs, void *arg);
	kmem_cache_t *metaslab_alloc_trace_cache;

	typedef struct metaslab_stats {
	kstat_named_t metaslabstat_trace_over_limit;
	kstat_named_t metaslabstat_reload_tree;
	kstat_named_t metaslabstat_too_many_tries;
	kstat_named_t metaslabstat_try_hard;
	} metaslab_stats_t;

	static metaslab_stats_t metaslab_stats = {
	{ "trace_over_limit", KSTAT_DATA_UINT64 },
	{ "reload_tree", KSTAT_DATA_UINT64 },
	{ "too_many_tries", KSTAT_DATA_UINT64 },
	{ "try_hard", KSTAT_DATA_UINT64 },
	};

	#define METASLABSTAT_BUMP(stat) \
	atomic_inc_64(&metaslab_stats.stat.value.ui64);


	kstat_t *metaslab_ksp;

	void
	metaslab_stat_init(void)
	{
	ASSERT(metaslab_alloc_trace_cache == NULL);
	metaslab_alloc_trace_cache = kmem_cache_create(
	"metaslab_alloc_trace_cache", sizeof (metaslab_alloc_trace_t),
	0, NULL, NULL, NULL, NULL, NULL, 0);
	metaslab_ksp = kstat_create("zfs", 0, "metaslab_stats",
	"misc", KSTAT_TYPE_NAMED, sizeof (metaslab_stats) /
	sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);
	if (metaslab_ksp != NULL) {
	metaslab_ksp->ks_data = &metaslab_stats;
	kstat_install(metaslab_ksp);
	}
	}

	void
	metaslab_stat_fini(void)
	{
	if (metaslab_ksp != NULL) {
	kstat_delete(metaslab_ksp);
	metaslab_ksp = NULL;
	}

	kmem_cache_destroy(metaslab_alloc_trace_cache);
	metaslab_alloc_trace_cache = NULL;
	}

	/*
	* ==========================================================================
	* Metaslab classes
	* ==========================================================================
	*/
	metaslab_class_t *
	metaslab_class_create(spa_t spa, metaslab_ops_t ops)
	{
	metaslab_class_t *mc;

	mc = kmem_zalloc(offsetof(metaslab_class_t,
	mc_allocator[spa->spa_alloc_count]), KM_SLEEP);

	mc->mc_spa = spa;
	mc->mc_ops = ops;
	mutex_init(&mc->mc_lock, NULL, MUTEX_DEFAULT, NULL);
	multilist_create(&mc->mc_metaslab_txg_list, sizeof (metaslab_t),
	offsetof(metaslab_t, ms_class_txg_node), metaslab_idx_func);
	for (int i = 0; i < spa->spa_alloc_count; i++) {
	metaslab_class_allocator_t *mca = &mc->mc_allocator[i];
	mca->mca_rotor = NULL;
	zfs_refcount_create_tracked(&mca->mca_alloc_slots);
	}

	return (mc);
	}

	void
	metaslab_class_destroy(metaslab_class_t *mc)
	{
	spa_t *spa = mc->mc_spa;

	ASSERT(mc->mc_alloc == 0);
	ASSERT(mc->mc_deferred == 0);
	ASSERT(mc->mc_space == 0);
	ASSERT(mc->mc_dspace == 0);

	for (int i = 0; i < spa->spa_alloc_count; i++) {
	metaslab_class_allocator_t *mca = &mc->mc_allocator[i];
	ASSERT(mca->mca_rotor == NULL);
	zfs_refcount_destroy(&mca->mca_alloc_slots);
	}
	mutex_destroy(&mc->mc_lock);
	multilist_destroy(&mc->mc_metaslab_txg_list);
	kmem_free(mc, offsetof(metaslab_class_t,
	mc_allocator[spa->spa_alloc_count]));
	}

	int
	metaslab_class_validate(metaslab_class_t *mc)
	{
	metaslab_group_t *mg;
	vdev_t *vd;

	/*
	* Must hold one of the spa_config locks.
	*/
	ASSERT(spa_config_held(mc->mc_spa, SCL_ALL, RW_READER) \|\|
	spa_config_held(mc->mc_spa, SCL_ALL, RW_WRITER));

	if ((mg = mc->mc_allocator[0].mca_rotor) == NULL)
	return (0);

	do {
	vd = mg->mg_vd;
	ASSERT(vd->vdev_mg != NULL);
	ASSERT3P(vd->vdev_top, ==, vd);
	ASSERT3P(mg->mg_class, ==, mc);
	ASSERT3P(vd->vdev_ops, !=, &vdev_hole_ops);
	} while ((mg = mg->mg_next) != mc->mc_allocator[0].mca_rotor);

	return (0);
	}

	static void
	metaslab_class_space_update(metaslab_class_t *mc, int64_t alloc_delta,
	int64_t defer_delta, int64_t space_delta, int64_t dspace_delta)
	{
	atomic_add_64(&mc->mc_alloc, alloc_delta);
	atomic_add_64(&mc->mc_deferred, defer_delta);
	atomic_add_64(&mc->mc_space, space_delta);
	atomic_add_64(&mc->mc_dspace, dspace_delta);
	}

	uint64_t
	metaslab_class_get_alloc(metaslab_class_t *mc)
	{
	return (mc->mc_alloc);
	}

	uint64_t
	metaslab_class_get_deferred(metaslab_class_t *mc)
	{
	return (mc->mc_deferred);
	}

	uint64_t
	metaslab_class_get_space(metaslab_class_t *mc)
	{
	return (mc->mc_space);
	}

	uint64_t
	metaslab_class_get_dspace(metaslab_class_t *mc)
	{
	return (spa_deflate(mc->mc_spa) ? mc->mc_dspace : mc->mc_space);
	}

	void
	metaslab_class_histogram_verify(metaslab_class_t *mc)
	{
	spa_t *spa = mc->mc_spa;
	vdev_t *rvd = spa->spa_root_vdev;
	uint64_t *mc_hist;
	int i;

	if ((zfs_flags & ZFS_DEBUG_HISTOGRAM_VERIFY) == 0)
	return;

	mc_hist = kmem_zalloc(sizeof (uint64_t) * RANGE_TREE_HISTOGRAM_SIZE,
	KM_SLEEP);

	mutex_enter(&mc->mc_lock);
	for (int c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];
	metaslab_group_t *mg = vdev_get_mg(tvd, mc);

	/*
	* Skip any holes, uninitialized top-levels, or
	* vdevs that are not in this metalab class.
	*/
	if (!vdev_is_concrete(tvd) \|\| tvd->vdev_ms_shift == 0 \|\|
	mg->mg_class != mc) {
	continue;
	}

	IMPLY(mg == mg->mg_vd->vdev_log_mg,
	mc == spa_embedded_log_class(mg->mg_vd->vdev_spa));

	for (i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++)
	mc_hist[i] += mg->mg_histogram[i];
	}

	for (i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) {
	VERIFY3U(mc_hist[i], ==, mc->mc_histogram[i]);
	}

	mutex_exit(&mc->mc_lock);
	kmem_free(mc_hist, sizeof (uint64_t) * RANGE_TREE_HISTOGRAM_SIZE);
	}

	/*
	* Calculate the metaslab class's fragmentation metric. The metric
	* is weighted based on the space contribution of each metaslab group.
	* The return value will be a number between 0 and 100 (inclusive), or
	* ZFS_FRAG_INVALID if the metric has not been set. See comment above the
	* zfs_frag_table for more information about the metric.
	*/
	uint64_t
	metaslab_class_fragmentation(metaslab_class_t *mc)
	{
	vdev_t *rvd = mc->mc_spa->spa_root_vdev;
	uint64_t fragmentation = 0;

	spa_config_enter(mc->mc_spa, SCL_VDEV, FTAG, RW_READER);

	for (int c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];
	metaslab_group_t *mg = tvd->vdev_mg;

	/*
	* Skip any holes, uninitialized top-levels,
	* or vdevs that are not in this metalab class.
	*/
	if (!vdev_is_concrete(tvd) \|\| tvd->vdev_ms_shift == 0 \|\|
	mg->mg_class != mc) {
	continue;
	}

	/*
	* If a metaslab group does not contain a fragmentation
	* metric then just bail out.
	*/
	if (mg->mg_fragmentation == ZFS_FRAG_INVALID) {
	spa_config_exit(mc->mc_spa, SCL_VDEV, FTAG);
	return (ZFS_FRAG_INVALID);
	}

	/*
	* Determine how much this metaslab_group is contributing
	* to the overall pool fragmentation metric.
	*/
	fragmentation += mg->mg_fragmentation *
	metaslab_group_get_space(mg);
	}
	fragmentation /= metaslab_class_get_space(mc);

	ASSERT3U(fragmentation, <=, 100);
	spa_config_exit(mc->mc_spa, SCL_VDEV, FTAG);
	return (fragmentation);
	}

	/*
	* Calculate the amount of expandable space that is available in
	* this metaslab class. If a device is expanded then its expandable
	* space will be the amount of allocatable space that is currently not
	* part of this metaslab class.
	*/
	uint64_t
	metaslab_class_expandable_space(metaslab_class_t *mc)
	{
	vdev_t *rvd = mc->mc_spa->spa_root_vdev;
	uint64_t space = 0;

	spa_config_enter(mc->mc_spa, SCL_VDEV, FTAG, RW_READER);
	for (int c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];
	metaslab_group_t *mg = tvd->vdev_mg;

	if (!vdev_is_concrete(tvd) \|\| tvd->vdev_ms_shift == 0 \|\|
	mg->mg_class != mc) {
	continue;
	}

	/*
	* Calculate if we have enough space to add additional
	* metaslabs. We report the expandable space in terms
	* of the metaslab size since that's the unit of expansion.
	*/
	space += P2ALIGN(tvd->vdev_max_asize - tvd->vdev_asize,
	1ULL << tvd->vdev_ms_shift);
	}
	spa_config_exit(mc->mc_spa, SCL_VDEV, FTAG);
	return (space);
	}

	void
	metaslab_class_evict_old(metaslab_class_t *mc, uint64_t txg)
	{
	multilist_t *ml = &mc->mc_metaslab_txg_list;
	for (int i = 0; i < multilist_get_num_sublists(ml); i++) {
	multilist_sublist_t *mls = multilist_sublist_lock(ml, i);
	metaslab_t *msp = multilist_sublist_head(mls);
	multilist_sublist_unlock(mls);
	while (msp != NULL) {
	mutex_enter(&msp->ms_lock);

	/*
	* If the metaslab has been removed from the list
	* (which could happen if we were at the memory limit
	* and it was evicted during this loop), then we can't
	* proceed and we should restart the sublist.
	*/
	if (!multilist_link_active(&msp->ms_class_txg_node)) {
	mutex_exit(&msp->ms_lock);
	i--;
	break;
	}
	mls = multilist_sublist_lock(ml, i);
	metaslab_t *next_msp = multilist_sublist_next(mls, msp);
	multilist_sublist_unlock(mls);
	if (txg >
	msp->ms_selected_txg + metaslab_unload_delay &&
	gethrtime() > msp->ms_selected_time +
	(uint64_t)MSEC2NSEC(metaslab_unload_delay_ms)) {
	metaslab_evict(msp, txg);
	} else {
	/*
	* Once we've hit a metaslab selected too
	* recently to evict, we're done evicting for
	* now.
	*/
	mutex_exit(&msp->ms_lock);
	break;
	}
	mutex_exit(&msp->ms_lock);
	msp = next_msp;
	}
	}
	}

	static int
	metaslab_compare(const void x1, const void x2)
	{
	const metaslab_t m1 = (const metaslab_t )x1;
	const metaslab_t m2 = (const metaslab_t )x2;

	int sort1 = 0;
	int sort2 = 0;
	if (m1->ms_allocator != -1 && m1->ms_primary)
	sort1 = 1;
	else if (m1->ms_allocator != -1 && !m1->ms_primary)
	sort1 = 2;
	if (m2->ms_allocator != -1 && m2->ms_primary)
	sort2 = 1;
	else if (m2->ms_allocator != -1 && !m2->ms_primary)
	sort2 = 2;

	/*
	* Sort inactive metaslabs first, then primaries, then secondaries. When
	* selecting a metaslab to allocate from, an allocator first tries its
	* primary, then secondary active metaslab. If it doesn't have active
	* metaslabs, or can't allocate from them, it searches for an inactive
	* metaslab to activate. If it can't find a suitable one, it will steal
	* a primary or secondary metaslab from another allocator.
	*/
	if (sort1 < sort2)
	return (-1);
	if (sort1 > sort2)
	return (1);

	int cmp = TREE_CMP(m2->ms_weight, m1->ms_weight);
	if (likely(cmp))
	return (cmp);

	IMPLY(TREE_CMP(m1->ms_start, m2->ms_start) == 0, m1 == m2);

	return (TREE_CMP(m1->ms_start, m2->ms_start));
	}

	/*
	* ==========================================================================
	* Metaslab groups
	* ==========================================================================
	*/
	/*
	* Update the allocatable flag and the metaslab group's capacity.
	* The allocatable flag is set to true if the capacity is below
	* the zfs_mg_noalloc_threshold or has a fragmentation value that is
	* greater than zfs_mg_fragmentation_threshold. If a metaslab group
	* transitions from allocatable to non-allocatable or vice versa then the
	* metaslab group's class is updated to reflect the transition.
	*/
	static void
	metaslab_group_alloc_update(metaslab_group_t *mg)
	{
	vdev_t *vd = mg->mg_vd;
	metaslab_class_t *mc = mg->mg_class;
	vdev_stat_t *vs = &vd->vdev_stat;
	boolean_t was_allocatable;
	boolean_t was_initialized;

	ASSERT(vd == vd->vdev_top);
	ASSERT3U(spa_config_held(mc->mc_spa, SCL_ALLOC, RW_READER), ==,
	SCL_ALLOC);

	mutex_enter(&mg->mg_lock);
	was_allocatable = mg->mg_allocatable;
	was_initialized = mg->mg_initialized;

	mg->mg_free_capacity = ((vs->vs_space - vs->vs_alloc) * 100) /
	(vs->vs_space + 1);

	mutex_enter(&mc->mc_lock);

	/*
	* If the metaslab group was just added then it won't
	* have any space until we finish syncing out this txg.
	* At that point we will consider it initialized and available
	* for allocations. We also don't consider non-activated
	* metaslab groups (e.g. vdevs that are in the middle of being removed)
	* to be initialized, because they can't be used for allocation.
	*/
	mg->mg_initialized = metaslab_group_initialized(mg);
	if (!was_initialized && mg->mg_initialized) {
	mc->mc_groups++;
	} else if (was_initialized && !mg->mg_initialized) {
	ASSERT3U(mc->mc_groups, >, 0);
	mc->mc_groups--;
	}
	if (mg->mg_initialized)
	mg->mg_no_free_space = B_FALSE;

	/*
	* A metaslab group is considered allocatable if it has plenty
	* of free space or is not heavily fragmented. We only take
	* fragmentation into account if the metaslab group has a valid
	* fragmentation metric (i.e. a value between 0 and 100).
	*/
	mg->mg_allocatable = (mg->mg_activation_count > 0 &&
	mg->mg_free_capacity > zfs_mg_noalloc_threshold &&
	(mg->mg_fragmentation == ZFS_FRAG_INVALID \|\|
	mg->mg_fragmentation <= zfs_mg_fragmentation_threshold));

	/*
	* The mc_alloc_groups maintains a count of the number of
	* groups in this metaslab class that are still above the
	* zfs_mg_noalloc_threshold. This is used by the allocating
	* threads to determine if they should avoid allocations to
	* a given group. The allocator will avoid allocations to a group
	* if that group has reached or is below the zfs_mg_noalloc_threshold
	* and there are still other groups that are above the threshold.
	* When a group transitions from allocatable to non-allocatable or
	* vice versa we update the metaslab class to reflect that change.
	* When the mc_alloc_groups value drops to 0 that means that all
	* groups have reached the zfs_mg_noalloc_threshold making all groups
	* eligible for allocations. This effectively means that all devices
	* are balanced again.
	*/
	if (was_allocatable && !mg->mg_allocatable)
	mc->mc_alloc_groups--;
	else if (!was_allocatable && mg->mg_allocatable)
	mc->mc_alloc_groups++;
	mutex_exit(&mc->mc_lock);

	mutex_exit(&mg->mg_lock);
	}

	int
	metaslab_sort_by_flushed(const void va, const void vb)
	{
	const metaslab_t *a = va;
	const metaslab_t *b = vb;

	int cmp = TREE_CMP(a->ms_unflushed_txg, b->ms_unflushed_txg);
	if (likely(cmp))
	return (cmp);

	uint64_t a_vdev_id = a->ms_group->mg_vd->vdev_id;
	uint64_t b_vdev_id = b->ms_group->mg_vd->vdev_id;
	cmp = TREE_CMP(a_vdev_id, b_vdev_id);
	if (cmp)
	return (cmp);

	return (TREE_CMP(a->ms_id, b->ms_id));
	}

	metaslab_group_t *
	metaslab_group_create(metaslab_class_t mc, vdev_t vd, int allocators)
	{
	metaslab_group_t *mg;

	mg = kmem_zalloc(offsetof(metaslab_group_t,
	mg_allocator[allocators]), KM_SLEEP);
	mutex_init(&mg->mg_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&mg->mg_ms_disabled_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&mg->mg_ms_disabled_cv, NULL, CV_DEFAULT, NULL);
	avl_create(&mg->mg_metaslab_tree, metaslab_compare,
	sizeof (metaslab_t), offsetof(metaslab_t, ms_group_node));
	mg->mg_vd = vd;
	mg->mg_class = mc;
	mg->mg_activation_count = 0;
	mg->mg_initialized = B_FALSE;
	mg->mg_no_free_space = B_TRUE;
	mg->mg_allocators = allocators;

	for (int i = 0; i < allocators; i++) {
	metaslab_group_allocator_t *mga = &mg->mg_allocator[i];
	zfs_refcount_create_tracked(&mga->mga_alloc_queue_depth);
	}

	mg->mg_taskq = taskq_create("metaslab_group_taskq", metaslab_load_pct,
	maxclsyspri, 10, INT_MAX, TASKQ_THREADS_CPU_PCT \| TASKQ_DYNAMIC);

	return (mg);
	}

	void
	metaslab_group_destroy(metaslab_group_t *mg)
	{
	ASSERT(mg->mg_prev == NULL);
	ASSERT(mg->mg_next == NULL);
	/*
	* We may have gone below zero with the activation count
	* either because we never activated in the first place or
	* because we're done, and possibly removing the vdev.
	*/
	ASSERT(mg->mg_activation_count <= 0);

	taskq_destroy(mg->mg_taskq);
	avl_destroy(&mg->mg_metaslab_tree);
	mutex_destroy(&mg->mg_lock);
	mutex_destroy(&mg->mg_ms_disabled_lock);
	cv_destroy(&mg->mg_ms_disabled_cv);

	for (int i = 0; i < mg->mg_allocators; i++) {
	metaslab_group_allocator_t *mga = &mg->mg_allocator[i];
	zfs_refcount_destroy(&mga->mga_alloc_queue_depth);
	}
	kmem_free(mg, offsetof(metaslab_group_t,
	mg_allocator[mg->mg_allocators]));
	}

	void
	metaslab_group_activate(metaslab_group_t *mg)
	{
	metaslab_class_t *mc = mg->mg_class;
	spa_t *spa = mc->mc_spa;
	metaslab_group_t mgprev, mgnext;

	ASSERT3U(spa_config_held(spa, SCL_ALLOC, RW_WRITER), !=, 0);

	ASSERT(mg->mg_prev == NULL);
	ASSERT(mg->mg_next == NULL);
	ASSERT(mg->mg_activation_count <= 0);

	if (++mg->mg_activation_count <= 0)
	return;

	mg->mg_aliquot = metaslab_aliquot * MAX(1, mg->mg_vd->vdev_children);
	metaslab_group_alloc_update(mg);

	if ((mgprev = mc->mc_allocator[0].mca_rotor) == NULL) {
	mg->mg_prev = mg;
	mg->mg_next = mg;
	} else {
	mgnext = mgprev->mg_next;
	mg->mg_prev = mgprev;
	mg->mg_next = mgnext;
	mgprev->mg_next = mg;
	mgnext->mg_prev = mg;
	}
	for (int i = 0; i < spa->spa_alloc_count; i++) {
	mc->mc_allocator[i].mca_rotor = mg;
	mg = mg->mg_next;
	}
	}

	/*
	* Passivate a metaslab group and remove it from the allocation rotor.
	* Callers must hold both the SCL_ALLOC and SCL_ZIO lock prior to passivating
	* a metaslab group. This function will momentarily drop spa_config_locks
	* that are lower than the SCL_ALLOC lock (see comment below).
	*/
	void
	metaslab_group_passivate(metaslab_group_t *mg)
	{
	metaslab_class_t *mc = mg->mg_class;
	spa_t *spa = mc->mc_spa;
	metaslab_group_t mgprev, mgnext;
	int locks = spa_config_held(spa, SCL_ALL, RW_WRITER);

	ASSERT3U(spa_config_held(spa, SCL_ALLOC \| SCL_ZIO, RW_WRITER), ==,
	(SCL_ALLOC \| SCL_ZIO));

	if (--mg->mg_activation_count != 0) {
	for (int i = 0; i < spa->spa_alloc_count; i++)
	ASSERT(mc->mc_allocator[i].mca_rotor != mg);
	ASSERT(mg->mg_prev == NULL);
	ASSERT(mg->mg_next == NULL);
	ASSERT(mg->mg_activation_count < 0);
	return;
	}

	/*
	* The spa_config_lock is an array of rwlocks, ordered as
	* follows (from highest to lowest):
	* SCL_CONFIG > SCL_STATE > SCL_L2ARC > SCL_ALLOC >
	* SCL_ZIO > SCL_FREE > SCL_VDEV
	* (For more information about the spa_config_lock see spa_misc.c)
	* The higher the lock, the broader its coverage. When we passivate
	* a metaslab group, we must hold both the SCL_ALLOC and the SCL_ZIO
	* config locks. However, the metaslab group's taskq might be trying
	* to preload metaslabs so we must drop the SCL_ZIO lock and any
	* lower locks to allow the I/O to complete. At a minimum,
	* we continue to hold the SCL_ALLOC lock, which prevents any future
	* allocations from taking place and any changes to the vdev tree.
	*/
	spa_config_exit(spa, locks & ~(SCL_ZIO - 1), spa);
	taskq_wait_outstanding(mg->mg_taskq, 0);
	spa_config_enter(spa, locks & ~(SCL_ZIO - 1), spa, RW_WRITER);
	metaslab_group_alloc_update(mg);
	for (int i = 0; i < mg->mg_allocators; i++) {
	metaslab_group_allocator_t *mga = &mg->mg_allocator[i];
	metaslab_t *msp = mga->mga_primary;
	if (msp != NULL) {
	mutex_enter(&msp->ms_lock);
	metaslab_passivate(msp,
	metaslab_weight_from_range_tree(msp));
	mutex_exit(&msp->ms_lock);
	}
	msp = mga->mga_secondary;
	if (msp != NULL) {
	mutex_enter(&msp->ms_lock);
	metaslab_passivate(msp,
	metaslab_weight_from_range_tree(msp));
	mutex_exit(&msp->ms_lock);
	}
	}

	mgprev = mg->mg_prev;
	mgnext = mg->mg_next;

	if (mg == mgnext) {
	mgnext = NULL;
	} else {
	mgprev->mg_next = mgnext;
	mgnext->mg_prev = mgprev;
	}
	for (int i = 0; i < spa->spa_alloc_count; i++) {
	if (mc->mc_allocator[i].mca_rotor == mg)
	mc->mc_allocator[i].mca_rotor = mgnext;
	}

	mg->mg_prev = NULL;
	mg->mg_next = NULL;
	}

	boolean_t
	metaslab_group_initialized(metaslab_group_t *mg)
	{
	vdev_t *vd = mg->mg_vd;
	vdev_stat_t *vs = &vd->vdev_stat;

	return (vs->vs_space != 0 && mg->mg_activation_count > 0);
	}

	uint64_t
	metaslab_group_get_space(metaslab_group_t *mg)
	{
	/*
	* Note that the number of nodes in mg_metaslab_tree may be one less
	* than vdev_ms_count, due to the embedded log metaslab.
	*/
	mutex_enter(&mg->mg_lock);
	uint64_t ms_count = avl_numnodes(&mg->mg_metaslab_tree);
	mutex_exit(&mg->mg_lock);
	return ((1ULL << mg->mg_vd->vdev_ms_shift) * ms_count);
	}

	void
	metaslab_group_histogram_verify(metaslab_group_t *mg)
	{
	uint64_t *mg_hist;
	avl_tree_t *t = &mg->mg_metaslab_tree;
	uint64_t ashift = mg->mg_vd->vdev_ashift;

	if ((zfs_flags & ZFS_DEBUG_HISTOGRAM_VERIFY) == 0)
	return;

	mg_hist = kmem_zalloc(sizeof (uint64_t) * RANGE_TREE_HISTOGRAM_SIZE,
	KM_SLEEP);

	ASSERT3U(RANGE_TREE_HISTOGRAM_SIZE, >=,
	SPACE_MAP_HISTOGRAM_SIZE + ashift);

	mutex_enter(&mg->mg_lock);
	for (metaslab_t *msp = avl_first(t);
	msp != NULL; msp = AVL_NEXT(t, msp)) {
	VERIFY3P(msp->ms_group, ==, mg);
	/* skip if not active */
	if (msp->ms_sm == NULL)
	continue;

	for (int i = 0; i < SPACE_MAP_HISTOGRAM_SIZE; i++) {
	mg_hist[i + ashift] +=
	msp->ms_sm->sm_phys->smp_histogram[i];
	}
	}

	for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i ++)
	VERIFY3U(mg_hist[i], ==, mg->mg_histogram[i]);

	mutex_exit(&mg->mg_lock);

	kmem_free(mg_hist, sizeof (uint64_t) * RANGE_TREE_HISTOGRAM_SIZE);
	}

	static void
	metaslab_group_histogram_add(metaslab_group_t mg, metaslab_t msp)
	{
	metaslab_class_t *mc = mg->mg_class;
	uint64_t ashift = mg->mg_vd->vdev_ashift;

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	if (msp->ms_sm == NULL)
	return;

	mutex_enter(&mg->mg_lock);
	mutex_enter(&mc->mc_lock);
	for (int i = 0; i < SPACE_MAP_HISTOGRAM_SIZE; i++) {
	IMPLY(mg == mg->mg_vd->vdev_log_mg,
	mc == spa_embedded_log_class(mg->mg_vd->vdev_spa));
	mg->mg_histogram[i + ashift] +=
	msp->ms_sm->sm_phys->smp_histogram[i];
	mc->mc_histogram[i + ashift] +=
	msp->ms_sm->sm_phys->smp_histogram[i];
	}
	mutex_exit(&mc->mc_lock);
	mutex_exit(&mg->mg_lock);
	}

	void
	metaslab_group_histogram_remove(metaslab_group_t mg, metaslab_t msp)
	{
	metaslab_class_t *mc = mg->mg_class;
	uint64_t ashift = mg->mg_vd->vdev_ashift;

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	if (msp->ms_sm == NULL)
	return;

	mutex_enter(&mg->mg_lock);
	mutex_enter(&mc->mc_lock);
	for (int i = 0; i < SPACE_MAP_HISTOGRAM_SIZE; i++) {
	ASSERT3U(mg->mg_histogram[i + ashift], >=,
	msp->ms_sm->sm_phys->smp_histogram[i]);
	ASSERT3U(mc->mc_histogram[i + ashift], >=,
	msp->ms_sm->sm_phys->smp_histogram[i]);
	IMPLY(mg == mg->mg_vd->vdev_log_mg,
	mc == spa_embedded_log_class(mg->mg_vd->vdev_spa));

	mg->mg_histogram[i + ashift] -=
	msp->ms_sm->sm_phys->smp_histogram[i];
	mc->mc_histogram[i + ashift] -=
	msp->ms_sm->sm_phys->smp_histogram[i];
	}
	mutex_exit(&mc->mc_lock);
	mutex_exit(&mg->mg_lock);
	}

	static void
	metaslab_group_add(metaslab_group_t mg, metaslab_t msp)
	{
	ASSERT(msp->ms_group == NULL);
	mutex_enter(&mg->mg_lock);
	msp->ms_group = mg;
	msp->ms_weight = 0;
	avl_add(&mg->mg_metaslab_tree, msp);
	mutex_exit(&mg->mg_lock);

	mutex_enter(&msp->ms_lock);
	metaslab_group_histogram_add(mg, msp);
	mutex_exit(&msp->ms_lock);
	}

	static void
	metaslab_group_remove(metaslab_group_t mg, metaslab_t msp)
	{
	mutex_enter(&msp->ms_lock);
	metaslab_group_histogram_remove(mg, msp);
	mutex_exit(&msp->ms_lock);

	mutex_enter(&mg->mg_lock);
	ASSERT(msp->ms_group == mg);
	avl_remove(&mg->mg_metaslab_tree, msp);

	metaslab_class_t *mc = msp->ms_group->mg_class;
	multilist_sublist_t *mls =
	multilist_sublist_lock_obj(&mc->mc_metaslab_txg_list, msp);
	if (multilist_link_active(&msp->ms_class_txg_node))
	multilist_sublist_remove(mls, msp);
	multilist_sublist_unlock(mls);

	msp->ms_group = NULL;
	mutex_exit(&mg->mg_lock);
	}

	static void
	metaslab_group_sort_impl(metaslab_group_t mg, metaslab_t msp, uint64_t weight)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));
	ASSERT(MUTEX_HELD(&mg->mg_lock));
	ASSERT(msp->ms_group == mg);

	avl_remove(&mg->mg_metaslab_tree, msp);
	msp->ms_weight = weight;
	avl_add(&mg->mg_metaslab_tree, msp);

	}

	static void
	metaslab_group_sort(metaslab_group_t mg, metaslab_t msp, uint64_t weight)
	{
	/*
	* Although in principle the weight can be any value, in
	* practice we do not use values in the range [1, 511].
	*/
	ASSERT(weight >= SPA_MINBLOCKSIZE \|\| weight == 0);
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	mutex_enter(&mg->mg_lock);
	metaslab_group_sort_impl(mg, msp, weight);
	mutex_exit(&mg->mg_lock);
	}

	/*
	* Calculate the fragmentation for a given metaslab group. We can use
	* a simple average here since all metaslabs within the group must have
	* the same size. The return value will be a value between 0 and 100
	* (inclusive), or ZFS_FRAG_INVALID if less than half of the metaslab in this
	* group have a fragmentation metric.
	*/
	uint64_t
	metaslab_group_fragmentation(metaslab_group_t *mg)
	{
	vdev_t *vd = mg->mg_vd;
	uint64_t fragmentation = 0;
	uint64_t valid_ms = 0;

	for (int m = 0; m < vd->vdev_ms_count; m++) {
	metaslab_t *msp = vd->vdev_ms[m];

	if (msp->ms_fragmentation == ZFS_FRAG_INVALID)
	continue;
	if (msp->ms_group != mg)
	continue;

	valid_ms++;
	fragmentation += msp->ms_fragmentation;
	}

	if (valid_ms <= mg->mg_vd->vdev_ms_count / 2)
	return (ZFS_FRAG_INVALID);

	fragmentation /= valid_ms;
	ASSERT3U(fragmentation, <=, 100);
	return (fragmentation);
	}

	/*
	* Determine if a given metaslab group should skip allocations. A metaslab
	* group should avoid allocations if its free capacity is less than the
	* zfs_mg_noalloc_threshold or its fragmentation metric is greater than
	* zfs_mg_fragmentation_threshold and there is at least one metaslab group
	* that can still handle allocations. If the allocation throttle is enabled
	* then we skip allocations to devices that have reached their maximum
	* allocation queue depth unless the selected metaslab group is the only
	* eligible group remaining.
	*/
	static boolean_t
	metaslab_group_allocatable(metaslab_group_t mg, metaslab_group_t rotor,
	uint64_t psize, int allocator, int d)
	{
	spa_t *spa = mg->mg_vd->vdev_spa;
	metaslab_class_t *mc = mg->mg_class;

	/*
	* We can only consider skipping this metaslab group if it's
	* in the normal metaslab class and there are other metaslab
	* groups to select from. Otherwise, we always consider it eligible
	* for allocations.
	*/
	if ((mc != spa_normal_class(spa) &&
	mc != spa_special_class(spa) &&
	mc != spa_dedup_class(spa)) \|\|
	mc->mc_groups <= 1)
	return (B_TRUE);

	/*
	* If the metaslab group's mg_allocatable flag is set (see comments
	* in metaslab_group_alloc_update() for more information) and
	* the allocation throttle is disabled then allow allocations to this
	* device. However, if the allocation throttle is enabled then
	* check if we have reached our allocation limit (mga_alloc_queue_depth)
	* to determine if we should allow allocations to this metaslab group.
	* If all metaslab groups are no longer considered allocatable
	* (mc_alloc_groups == 0) or we're trying to allocate the smallest
	* gang block size then we allow allocations on this metaslab group
	* regardless of the mg_allocatable or throttle settings.
	*/
	if (mg->mg_allocatable) {
	metaslab_group_allocator_t *mga = &mg->mg_allocator[allocator];
	int64_t qdepth;
	uint64_t qmax = mga->mga_cur_max_alloc_queue_depth;

	if (!mc->mc_alloc_throttle_enabled)
	return (B_TRUE);

	/*
	* If this metaslab group does not have any free space, then
	* there is no point in looking further.
	*/
	if (mg->mg_no_free_space)
	return (B_FALSE);

	/*
	* Relax allocation throttling for ditto blocks. Due to
	* random imbalances in allocation it tends to push copies
	* to one vdev, that looks a bit better at the moment.
	*/
	qmax = qmax * (4 + d) / 4;

	qdepth = zfs_refcount_count(&mga->mga_alloc_queue_depth);

	/*
	* If this metaslab group is below its qmax or it's
	* the only allocatable metasable group, then attempt
	* to allocate from it.
	*/
	if (qdepth < qmax \|\| mc->mc_alloc_groups == 1)
	return (B_TRUE);
	ASSERT3U(mc->mc_alloc_groups, >, 1);

	/*
	* Since this metaslab group is at or over its qmax, we
	* need to determine if there are metaslab groups after this
	* one that might be able to handle this allocation. This is
	* racy since we can't hold the locks for all metaslab
	* groups at the same time when we make this check.
	*/
	for (metaslab_group_t *mgp = mg->mg_next;
	mgp != rotor; mgp = mgp->mg_next) {
	metaslab_group_allocator_t *mgap =
	&mgp->mg_allocator[allocator];
	qmax = mgap->mga_cur_max_alloc_queue_depth;
	qmax = qmax * (4 + d) / 4;
	qdepth =
	zfs_refcount_count(&mgap->mga_alloc_queue_depth);

	/*
	* If there is another metaslab group that
	* might be able to handle the allocation, then
	* we return false so that we skip this group.
	*/
	if (qdepth < qmax && !mgp->mg_no_free_space)
	return (B_FALSE);
	}

	/*
	* We didn't find another group to handle the allocation
	* so we can't skip this metaslab group even though
	* we are at or over our qmax.
	*/
	return (B_TRUE);

	} else if (mc->mc_alloc_groups == 0 \|\| psize == SPA_MINBLOCKSIZE) {
	return (B_TRUE);
	}
	return (B_FALSE);
	}

	/*
	* ==========================================================================
	* Range tree callbacks
	* ==========================================================================
	*/

	/*
	* Comparison function for the private size-ordered tree using 32-bit
	* ranges. Tree is sorted by size, larger sizes at the end of the tree.
	*/
	static int
	metaslab_rangesize32_compare(const void x1, const void x2)
	{
	const range_seg32_t *r1 = x1;
	const range_seg32_t *r2 = x2;

	uint64_t rs_size1 = r1->rs_end - r1->rs_start;
	uint64_t rs_size2 = r2->rs_end - r2->rs_start;

	int cmp = TREE_CMP(rs_size1, rs_size2);
	if (likely(cmp))
	return (cmp);

	return (TREE_CMP(r1->rs_start, r2->rs_start));
	}

	/*
	* Comparison function for the private size-ordered tree using 64-bit
	* ranges. Tree is sorted by size, larger sizes at the end of the tree.
	*/
	static int
	metaslab_rangesize64_compare(const void x1, const void x2)
	{
	const range_seg64_t *r1 = x1;
	const range_seg64_t *r2 = x2;

	uint64_t rs_size1 = r1->rs_end - r1->rs_start;
	uint64_t rs_size2 = r2->rs_end - r2->rs_start;

	int cmp = TREE_CMP(rs_size1, rs_size2);
	if (likely(cmp))
	return (cmp);

	return (TREE_CMP(r1->rs_start, r2->rs_start));
	}
	typedef struct metaslab_rt_arg {
	zfs_btree_t *mra_bt;
	uint32_t mra_floor_shift;
	} metaslab_rt_arg_t;

	struct mssa_arg {
	range_tree_t *rt;
	metaslab_rt_arg_t *mra;
	};

	static void
	metaslab_size_sorted_add(void *arg, uint64_t start, uint64_t size)
	{
	struct mssa_arg *mssap = arg;
	range_tree_t *rt = mssap->rt;
	metaslab_rt_arg_t *mrap = mssap->mra;
	range_seg_max_t seg = {0};
	rs_set_start(&seg, rt, start);
	rs_set_end(&seg, rt, start + size);
	metaslab_rt_add(rt, &seg, mrap);
	}

	static void
	metaslab_size_tree_full_load(range_tree_t *rt)
	{
	metaslab_rt_arg_t *mrap = rt->rt_arg;
	METASLABSTAT_BUMP(metaslabstat_reload_tree);
	ASSERT0(zfs_btree_numnodes(mrap->mra_bt));
	mrap->mra_floor_shift = 0;
	struct mssa_arg arg = {0};
	arg.rt = rt;
	arg.mra = mrap;
	range_tree_walk(rt, metaslab_size_sorted_add, &arg);
	}

	/*
	* Create any block allocator specific components. The current allocators
	* rely on using both a size-ordered range_tree_t and an array of uint64_t's.
	*/
	/* ARGSUSED */
	static void
	metaslab_rt_create(range_tree_t rt, void arg)
	{
	metaslab_rt_arg_t *mrap = arg;
	zfs_btree_t *size_tree = mrap->mra_bt;

	size_t size;
	int (compare) (const void , const void *);
	switch (rt->rt_type) {
	case RANGE_SEG32:
	size = sizeof (range_seg32_t);
	compare = metaslab_rangesize32_compare;
	break;
	case RANGE_SEG64:
	size = sizeof (range_seg64_t);
	compare = metaslab_rangesize64_compare;
	break;
	default:
	panic("Invalid range seg type %d", rt->rt_type);
	}
	zfs_btree_create(size_tree, compare, size);
	mrap->mra_floor_shift = metaslab_by_size_min_shift;
	}

	/* ARGSUSED */
	static void
	metaslab_rt_destroy(range_tree_t rt, void arg)
	{
	metaslab_rt_arg_t *mrap = arg;
	zfs_btree_t *size_tree = mrap->mra_bt;

	zfs_btree_destroy(size_tree);
	kmem_free(mrap, sizeof (*mrap));
	}

	/* ARGSUSED */
	static void
	metaslab_rt_add(range_tree_t rt, range_seg_t rs, void *arg)
	{
	metaslab_rt_arg_t *mrap = arg;
	zfs_btree_t *size_tree = mrap->mra_bt;

	if (rs_get_end(rs, rt) - rs_get_start(rs, rt) <
	(1 << mrap->mra_floor_shift))
	return;

	zfs_btree_add(size_tree, rs);
	}

	/* ARGSUSED */
	static void
	metaslab_rt_remove(range_tree_t rt, range_seg_t rs, void *arg)
	{
	metaslab_rt_arg_t *mrap = arg;
	zfs_btree_t *size_tree = mrap->mra_bt;

	if (rs_get_end(rs, rt) - rs_get_start(rs, rt) < (1 <<
	mrap->mra_floor_shift))
	return;

	zfs_btree_remove(size_tree, rs);
	}

	/* ARGSUSED */
	static void
	metaslab_rt_vacate(range_tree_t rt, void arg)
	{
	metaslab_rt_arg_t *mrap = arg;
	zfs_btree_t *size_tree = mrap->mra_bt;
	zfs_btree_clear(size_tree);
	zfs_btree_destroy(size_tree);

	metaslab_rt_create(rt, arg);
	}

	static range_tree_ops_t metaslab_rt_ops = {
	.rtop_create = metaslab_rt_create,
	.rtop_destroy = metaslab_rt_destroy,
	.rtop_add = metaslab_rt_add,
	.rtop_remove = metaslab_rt_remove,
	.rtop_vacate = metaslab_rt_vacate
	};

	/*
	* ==========================================================================
	* Common allocator routines
	* ==========================================================================
	*/

	/*
	* Return the maximum contiguous segment within the metaslab.
	*/
	uint64_t
	metaslab_largest_allocatable(metaslab_t *msp)
	{
	zfs_btree_t *t = &msp->ms_allocatable_by_size;
	range_seg_t *rs;

	if (t == NULL)
	return (0);
	if (zfs_btree_numnodes(t) == 0)
	metaslab_size_tree_full_load(msp->ms_allocatable);

	rs = zfs_btree_last(t, NULL);
	if (rs == NULL)
	return (0);

	return (rs_get_end(rs, msp->ms_allocatable) - rs_get_start(rs,
	msp->ms_allocatable));
	}

	/*
	* Return the maximum contiguous segment within the unflushed frees of this
	* metaslab.
	*/
	static uint64_t
	metaslab_largest_unflushed_free(metaslab_t *msp)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	if (msp->ms_unflushed_frees == NULL)
	return (0);

	if (zfs_btree_numnodes(&msp->ms_unflushed_frees_by_size) == 0)
	metaslab_size_tree_full_load(msp->ms_unflushed_frees);
	range_seg_t *rs = zfs_btree_last(&msp->ms_unflushed_frees_by_size,
	NULL);
	if (rs == NULL)
	return (0);

	/*
	* When a range is freed from the metaslab, that range is added to
	* both the unflushed frees and the deferred frees. While the block
	* will eventually be usable, if the metaslab were loaded the range
	* would not be added to the ms_allocatable tree until TXG_DEFER_SIZE
	* txgs had passed. As a result, when attempting to estimate an upper
	* bound for the largest currently-usable free segment in the
	* metaslab, we need to not consider any ranges currently in the defer
	* trees. This algorithm approximates the largest available chunk in
	* the largest range in the unflushed_frees tree by taking the first
	* chunk. While this may be a poor estimate, it should only remain so
	* briefly and should eventually self-correct as frees are no longer
	* deferred. Similar logic applies to the ms_freed tree. See
	* metaslab_load() for more details.
	*
	* There are two primary sources of inaccuracy in this estimate. Both
	* are tolerated for performance reasons. The first source is that we
	* only check the largest segment for overlaps. Smaller segments may
	* have more favorable overlaps with the other trees, resulting in
	* larger usable chunks. Second, we only look at the first chunk in
	* the largest segment; there may be other usable chunks in the
	* largest segment, but we ignore them.
	*/
	uint64_t rstart = rs_get_start(rs, msp->ms_unflushed_frees);
	uint64_t rsize = rs_get_end(rs, msp->ms_unflushed_frees) - rstart;
	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	uint64_t start = 0;
	uint64_t size = 0;
	boolean_t found = range_tree_find_in(msp->ms_defer[t], rstart,
	rsize, &start, &size);
	if (found) {
	if (rstart == start)
	return (0);
	rsize = start - rstart;
	}
	}

	uint64_t start = 0;
	uint64_t size = 0;
	boolean_t found = range_tree_find_in(msp->ms_freed, rstart,
	rsize, &start, &size);
	if (found)
	rsize = start - rstart;

	return (rsize);
	}

	static range_seg_t *
	metaslab_block_find(zfs_btree_t t, range_tree_t rt, uint64_t start,
	uint64_t size, zfs_btree_index_t *where)
	{
	range_seg_t *rs;
	range_seg_max_t rsearch;

	rs_set_start(&rsearch, rt, start);
	rs_set_end(&rsearch, rt, start + size);

	rs = zfs_btree_find(t, &rsearch, where);
	if (rs == NULL) {
	rs = zfs_btree_next(t, where, where);
	}

	return (rs);
	}

	#if defined(WITH_DF_BLOCK_ALLOCATOR) \|\| \
	defined(WITH_CF_BLOCK_ALLOCATOR)

	/*
	* This is a helper function that can be used by the allocator to find a
	* suitable block to allocate. This will search the specified B-tree looking
	* for a block that matches the specified criteria.
	*/
	static uint64_t
	metaslab_block_picker(range_tree_t rt, uint64_t cursor, uint64_t size,
	uint64_t max_search)
	{
	if (*cursor == 0)
	*cursor = rt->rt_start;
	zfs_btree_t *bt = &rt->rt_root;
	zfs_btree_index_t where;
	range_seg_t rs = metaslab_block_find(bt, rt, cursor, size, &where);
	uint64_t first_found;
	int count_searched = 0;

	if (rs != NULL)
	first_found = rs_get_start(rs, rt);

	while (rs != NULL && (rs_get_start(rs, rt) - first_found <=
	max_search \|\| count_searched < metaslab_min_search_count)) {
	uint64_t offset = rs_get_start(rs, rt);
	if (offset + size <= rs_get_end(rs, rt)) {
	*cursor = offset + size;
	return (offset);
	}
	rs = zfs_btree_next(bt, &where, &where);
	count_searched++;
	}

	*cursor = 0;
	return (-1ULL);
	}
	#endif /* WITH_DF/CF_BLOCK_ALLOCATOR */

	#if defined(WITH_DF_BLOCK_ALLOCATOR)
	/*
	* ==========================================================================
	* Dynamic Fit (df) block allocator
	*
	* Search for a free chunk of at least this size, starting from the last
	* offset (for this alignment of block) looking for up to
	* metaslab_df_max_search bytes (16MB). If a large enough free chunk is not
	* found within 16MB, then return a free chunk of exactly the requested size (or
	* larger).
	*
	* If it seems like searching from the last offset will be unproductive, skip
	* that and just return a free chunk of exactly the requested size (or larger).
	* This is based on metaslab_df_alloc_threshold and metaslab_df_free_pct. This
	* mechanism is probably not very useful and may be removed in the future.
	*
	* The behavior when not searching can be changed to return the largest free
	* chunk, instead of a free chunk of exactly the requested size, by setting
	* metaslab_df_use_largest_segment.
	* ==========================================================================
	*/
	static uint64_t
	metaslab_df_alloc(metaslab_t *msp, uint64_t size)
	{
	/*
	* Find the largest power of 2 block size that evenly divides the
	* requested size. This is used to try to allocate blocks with similar
	* alignment from the same area of the metaslab (i.e. same cursor
	* bucket) but it does not guarantee that other allocations sizes
	* may exist in the same region.
	*/
	uint64_t align = size & -size;
	uint64_t *cursor = &msp->ms_lbas[highbit64(align) - 1];
	range_tree_t *rt = msp->ms_allocatable;
	int free_pct = range_tree_space(rt) * 100 / msp->ms_size;
	uint64_t offset;

	ASSERT(MUTEX_HELD(&msp->ms_lock));

	/*
	* If we're running low on space, find a segment based on size,
	* rather than iterating based on offset.
	*/
	if (metaslab_largest_allocatable(msp) < metaslab_df_alloc_threshold \|\|
	free_pct < metaslab_df_free_pct) {
	offset = -1;
	} else {
	offset = metaslab_block_picker(rt,
	cursor, size, metaslab_df_max_search);
	}

	if (offset == -1) {
	range_seg_t *rs;
	if (zfs_btree_numnodes(&msp->ms_allocatable_by_size) == 0)
	metaslab_size_tree_full_load(msp->ms_allocatable);

	if (metaslab_df_use_largest_segment) {
	/* use largest free segment */
	rs = zfs_btree_last(&msp->ms_allocatable_by_size, NULL);
	} else {
	zfs_btree_index_t where;
	/* use segment of this size, or next largest */
	rs = metaslab_block_find(&msp->ms_allocatable_by_size,
	rt, msp->ms_start, size, &where);
	}
	if (rs != NULL && rs_get_start(rs, rt) + size <= rs_get_end(rs,
	rt)) {
	offset = rs_get_start(rs, rt);
	*cursor = offset + size;
	}
	}

	return (offset);
	}

	static metaslab_ops_t metaslab_df_ops = {
	metaslab_df_alloc
	};

	metaslab_ops_t *zfs_metaslab_ops = &metaslab_df_ops;
	#endif /* WITH_DF_BLOCK_ALLOCATOR */

	#if defined(WITH_CF_BLOCK_ALLOCATOR)
	/*
	* ==========================================================================
	* Cursor fit block allocator -
	* Select the largest region in the metaslab, set the cursor to the beginning
	* of the range and the cursor_end to the end of the range. As allocations
	* are made advance the cursor. Continue allocating from the cursor until
	* the range is exhausted and then find a new range.
	* ==========================================================================
	*/
	static uint64_t
	metaslab_cf_alloc(metaslab_t *msp, uint64_t size)
	{
	range_tree_t *rt = msp->ms_allocatable;
	zfs_btree_t *t = &msp->ms_allocatable_by_size;
	uint64_t *cursor = &msp->ms_lbas[0];
	uint64_t *cursor_end = &msp->ms_lbas[1];
	uint64_t offset = 0;

	ASSERT(MUTEX_HELD(&msp->ms_lock));

	ASSERT3U(cursor_end, >=, cursor);

	if ((cursor + size) > cursor_end) {
	range_seg_t *rs;

	if (zfs_btree_numnodes(t) == 0)
	metaslab_size_tree_full_load(msp->ms_allocatable);
	rs = zfs_btree_last(t, NULL);
	if (rs == NULL \|\| (rs_get_end(rs, rt) - rs_get_start(rs, rt)) <
	size)
	return (-1ULL);

	*cursor = rs_get_start(rs, rt);
	*cursor_end = rs_get_end(rs, rt);
	}

	offset = *cursor;
	*cursor += size;

	return (offset);
	}

	static metaslab_ops_t metaslab_cf_ops = {
	metaslab_cf_alloc
	};

	metaslab_ops_t *zfs_metaslab_ops = &metaslab_cf_ops;
	#endif /* WITH_CF_BLOCK_ALLOCATOR */

	#if defined(WITH_NDF_BLOCK_ALLOCATOR)
	/*
	* ==========================================================================
	* New dynamic fit allocator -
	* Select a region that is large enough to allocate 2^metaslab_ndf_clump_shift
	* contiguous blocks. If no region is found then just use the largest segment
	* that remains.
	* ==========================================================================
	*/

	/*
	* Determines desired number of contiguous blocks (2^metaslab_ndf_clump_shift)
	* to request from the allocator.
	*/
	uint64_t metaslab_ndf_clump_shift = 4;

	static uint64_t
	metaslab_ndf_alloc(metaslab_t *msp, uint64_t size)
	{
	zfs_btree_t *t = &msp->ms_allocatable->rt_root;
	range_tree_t *rt = msp->ms_allocatable;
	zfs_btree_index_t where;
	range_seg_t *rs;
	range_seg_max_t rsearch;
	uint64_t hbit = highbit64(size);
	uint64_t *cursor = &msp->ms_lbas[hbit - 1];
	uint64_t max_size = metaslab_largest_allocatable(msp);

	ASSERT(MUTEX_HELD(&msp->ms_lock));

	if (max_size < size)
	return (-1ULL);

	rs_set_start(&rsearch, rt, *cursor);
	rs_set_end(&rsearch, rt, *cursor + size);

	rs = zfs_btree_find(t, &rsearch, &where);
	if (rs == NULL \|\| (rs_get_end(rs, rt) - rs_get_start(rs, rt)) < size) {
	t = &msp->ms_allocatable_by_size;

	rs_set_start(&rsearch, rt, 0);
	rs_set_end(&rsearch, rt, MIN(max_size, 1ULL << (hbit +
	metaslab_ndf_clump_shift)));

	rs = zfs_btree_find(t, &rsearch, &where);
	if (rs == NULL)
	rs = zfs_btree_next(t, &where, &where);
	ASSERT(rs != NULL);
	}

	if ((rs_get_end(rs, rt) - rs_get_start(rs, rt)) >= size) {
	*cursor = rs_get_start(rs, rt) + size;
	return (rs_get_start(rs, rt));
	}
	return (-1ULL);
	}

	static metaslab_ops_t metaslab_ndf_ops = {
	metaslab_ndf_alloc
	};

	metaslab_ops_t *zfs_metaslab_ops = &metaslab_ndf_ops;
	#endif /* WITH_NDF_BLOCK_ALLOCATOR */


	/*
	* ==========================================================================
	* Metaslabs
	* ==========================================================================
	*/

	/*
	* Wait for any in-progress metaslab loads to complete.
	*/
	static void
	metaslab_load_wait(metaslab_t *msp)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	while (msp->ms_loading) {
	ASSERT(!msp->ms_loaded);
	cv_wait(&msp->ms_load_cv, &msp->ms_lock);
	}
	}

	/*
	* Wait for any in-progress flushing to complete.
	*/
	static void
	metaslab_flush_wait(metaslab_t *msp)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	while (msp->ms_flushing)
	cv_wait(&msp->ms_flush_cv, &msp->ms_lock);
	}

	static unsigned int
	metaslab_idx_func(multilist_t ml, void arg)
	{
	metaslab_t *msp = arg;

	/*
	* ms_id values are allocated sequentially, so full 64bit
	* division would be a waste of time, so limit it to 32 bits.
	*/
	return ((unsigned int)msp->ms_id % multilist_get_num_sublists(ml));
	}

	uint64_t
	metaslab_allocated_space(metaslab_t *msp)
	{
	return (msp->ms_allocated_space);
	}

	/*
	* Verify that the space accounting on disk matches the in-core range_trees.
	*/
	static void
	metaslab_verify_space(metaslab_t *msp, uint64_t txg)
	{
	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;
	uint64_t allocating = 0;
	uint64_t sm_free_space, msp_free_space;

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	ASSERT(!msp->ms_condensing);

	if ((zfs_flags & ZFS_DEBUG_METASLAB_VERIFY) == 0)
	return;

	/*
	* We can only verify the metaslab space when we're called
	* from syncing context with a loaded metaslab that has an
	* allocated space map. Calling this in non-syncing context
	* does not provide a consistent view of the metaslab since
	* we're performing allocations in the future.
	*/
	if (txg != spa_syncing_txg(spa) \|\| msp->ms_sm == NULL \|\|
	!msp->ms_loaded)
	return;

	/*
	* Even though the smp_alloc field can get negative,
	* when it comes to a metaslab's space map, that should
	* never be the case.
	*/
	ASSERT3S(space_map_allocated(msp->ms_sm), >=, 0);

	ASSERT3U(space_map_allocated(msp->ms_sm), >=,
	range_tree_space(msp->ms_unflushed_frees));

	ASSERT3U(metaslab_allocated_space(msp), ==,
	space_map_allocated(msp->ms_sm) +
	range_tree_space(msp->ms_unflushed_allocs) -
	range_tree_space(msp->ms_unflushed_frees));

	sm_free_space = msp->ms_size - metaslab_allocated_space(msp);

	/*
	* Account for future allocations since we would have
	* already deducted that space from the ms_allocatable.
	*/
	for (int t = 0; t < TXG_CONCURRENT_STATES; t++) {
	allocating +=
	range_tree_space(msp->ms_allocating[(txg + t) & TXG_MASK]);
	}
	ASSERT3U(allocating + msp->ms_allocated_this_txg, ==,
	msp->ms_allocating_total);

	ASSERT3U(msp->ms_deferspace, ==,
	range_tree_space(msp->ms_defer[0]) +
	range_tree_space(msp->ms_defer[1]));

	msp_free_space = range_tree_space(msp->ms_allocatable) + allocating +
	msp->ms_deferspace + range_tree_space(msp->ms_freed);

	VERIFY3U(sm_free_space, ==, msp_free_space);
	}

	static void
	metaslab_aux_histograms_clear(metaslab_t *msp)
	{
	/*
	* Auxiliary histograms are only cleared when resetting them,
	* which can only happen while the metaslab is loaded.
	*/
	ASSERT(msp->ms_loaded);

	bzero(msp->ms_synchist, sizeof (msp->ms_synchist));
	for (int t = 0; t < TXG_DEFER_SIZE; t++)
	bzero(msp->ms_deferhist[t], sizeof (msp->ms_deferhist[t]));
	}

	static void
	metaslab_aux_histogram_add(uint64_t *histogram, uint64_t shift,
	range_tree_t *rt)
	{
	/*
	* This is modeled after space_map_histogram_add(), so refer to that
	* function for implementation details. We want this to work like
	* the space map histogram, and not the range tree histogram, as we
	* are essentially constructing a delta that will be later subtracted
	* from the space map histogram.
	*/
	int idx = 0;
	for (int i = shift; i < RANGE_TREE_HISTOGRAM_SIZE; i++) {
	ASSERT3U(i, >=, idx + shift);
	histogram[idx] += rt->rt_histogram[i] << (i - idx - shift);

	if (idx < SPACE_MAP_HISTOGRAM_SIZE - 1) {
	ASSERT3U(idx + shift, ==, i);
	idx++;
	ASSERT3U(idx, <, SPACE_MAP_HISTOGRAM_SIZE);
	}
	}
	}

	/*
	* Called at every sync pass that the metaslab gets synced.
	*
	* The reason is that we want our auxiliary histograms to be updated
	* wherever the metaslab's space map histogram is updated. This way
	* we stay consistent on which parts of the metaslab space map's
	* histogram are currently not available for allocations (e.g because
	* they are in the defer, freed, and freeing trees).
	*/
	static void
	metaslab_aux_histograms_update(metaslab_t *msp)
	{
	space_map_t *sm = msp->ms_sm;
	ASSERT(sm != NULL);

	/*
	* This is similar to the metaslab's space map histogram updates
	* that take place in metaslab_sync(). The only difference is that
	* we only care about segments that haven't made it into the
	* ms_allocatable tree yet.
	*/
	if (msp->ms_loaded) {
	metaslab_aux_histograms_clear(msp);

	metaslab_aux_histogram_add(msp->ms_synchist,
	sm->sm_shift, msp->ms_freed);

	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	metaslab_aux_histogram_add(msp->ms_deferhist[t],
	sm->sm_shift, msp->ms_defer[t]);
	}
	}

	metaslab_aux_histogram_add(msp->ms_synchist,
	sm->sm_shift, msp->ms_freeing);
	}

	/*
	* Called every time we are done syncing (writing to) the metaslab,
	* i.e. at the end of each sync pass.
	* [see the comment in metaslab_impl.h for ms_synchist, ms_deferhist]
	*/
	static void
	metaslab_aux_histograms_update_done(metaslab_t *msp, boolean_t defer_allowed)
	{
	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;
	space_map_t *sm = msp->ms_sm;

	if (sm == NULL) {
	/*
	* We came here from metaslab_init() when creating/opening a
	* pool, looking at a metaslab that hasn't had any allocations
	* yet.
	*/
	return;
	}

	/*
	* This is similar to the actions that we take for the ms_freed
	* and ms_defer trees in metaslab_sync_done().
	*/
	uint64_t hist_index = spa_syncing_txg(spa) % TXG_DEFER_SIZE;
	if (defer_allowed) {
	bcopy(msp->ms_synchist, msp->ms_deferhist[hist_index],
	sizeof (msp->ms_synchist));
	} else {
	bzero(msp->ms_deferhist[hist_index],
	sizeof (msp->ms_deferhist[hist_index]));
	}
	bzero(msp->ms_synchist, sizeof (msp->ms_synchist));
	}

	/*
	* Ensure that the metaslab's weight and fragmentation are consistent
	* with the contents of the histogram (either the range tree's histogram
	* or the space map's depending whether the metaslab is loaded).
	*/
	static void
	metaslab_verify_weight_and_frag(metaslab_t *msp)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	if ((zfs_flags & ZFS_DEBUG_METASLAB_VERIFY) == 0)
	return;

	/*
	* We can end up here from vdev_remove_complete(), in which case we
	* cannot do these assertions because we hold spa config locks and
	* thus we are not allowed to read from the DMU.
	*
	* We check if the metaslab group has been removed and if that's
	* the case we return immediately as that would mean that we are
	* here from the aforementioned code path.
	*/
	if (msp->ms_group == NULL)
	return;

	/*
	* Devices being removed always return a weight of 0 and leave
	* fragmentation and ms_max_size as is - there is nothing for
	* us to verify here.
	*/
	vdev_t *vd = msp->ms_group->mg_vd;
	if (vd->vdev_removing)
	return;

	/*
	* If the metaslab is dirty it probably means that we've done
	* some allocations or frees that have changed our histograms
	* and thus the weight.
	*/
	for (int t = 0; t < TXG_SIZE; t++) {
	if (txg_list_member(&vd->vdev_ms_list, msp, t))
	return;
	}

	/*
	* This verification checks that our in-memory state is consistent
	* with what's on disk. If the pool is read-only then there aren't
	* any changes and we just have the initially-loaded state.
	*/
	if (!spa_writeable(msp->ms_group->mg_vd->vdev_spa))
	return;

	/* some extra verification for in-core tree if you can */
	if (msp->ms_loaded) {
	range_tree_stat_verify(msp->ms_allocatable);
	VERIFY(space_map_histogram_verify(msp->ms_sm,
	msp->ms_allocatable));
	}

	uint64_t weight = msp->ms_weight;
	uint64_t was_active = msp->ms_weight & METASLAB_ACTIVE_MASK;
	boolean_t space_based = WEIGHT_IS_SPACEBASED(msp->ms_weight);
	uint64_t frag = msp->ms_fragmentation;
	uint64_t max_segsize = msp->ms_max_size;

	msp->ms_weight = 0;
	msp->ms_fragmentation = 0;

	/*
	* This function is used for verification purposes and thus should
	* not introduce any side-effects/mutations on the system's state.
	*
	* Regardless of whether metaslab_weight() thinks this metaslab
	* should be active or not, we want to ensure that the actual weight
	* (and therefore the value of ms_weight) would be the same if it
	* was to be recalculated at this point.
	*
	* In addition we set the nodirty flag so metaslab_weight() does
	* not dirty the metaslab for future TXGs (e.g. when trying to
	* force condensing to upgrade the metaslab spacemaps).
	*/
	msp->ms_weight = metaslab_weight(msp, B_TRUE) \| was_active;

	VERIFY3U(max_segsize, ==, msp->ms_max_size);

	/*
	* If the weight type changed then there is no point in doing
	* verification. Revert fields to their original values.
	*/
	if ((space_based && !WEIGHT_IS_SPACEBASED(msp->ms_weight)) \|\|
	(!space_based && WEIGHT_IS_SPACEBASED(msp->ms_weight))) {
	msp->ms_fragmentation = frag;
	msp->ms_weight = weight;
	return;
	}

	VERIFY3U(msp->ms_fragmentation, ==, frag);
	VERIFY3U(msp->ms_weight, ==, weight);
	}

	/*
	* If we're over the zfs_metaslab_mem_limit, select the loaded metaslab from
	* this class that was used longest ago, and attempt to unload it. We don't
	* want to spend too much time in this loop to prevent performance
	* degradation, and we expect that most of the time this operation will
	* succeed. Between that and the normal unloading processing during txg sync,
	* we expect this to keep the metaslab memory usage under control.
	*/
	static void
	metaslab_potentially_evict(metaslab_class_t *mc)
	{
	#ifdef _KERNEL
	uint64_t allmem = arc_all_memory();
	uint64_t inuse = spl_kmem_cache_inuse(zfs_btree_leaf_cache);
	uint64_t size = spl_kmem_cache_entry_size(zfs_btree_leaf_cache);
	int tries = 0;
	for (; allmem * zfs_metaslab_mem_limit / 100 < inuse * size &&
	tries < multilist_get_num_sublists(&mc->mc_metaslab_txg_list) * 2;
	tries++) {
	unsigned int idx = multilist_get_random_index(
	&mc->mc_metaslab_txg_list);
	multilist_sublist_t *mls =
	multilist_sublist_lock(&mc->mc_metaslab_txg_list, idx);
	metaslab_t *msp = multilist_sublist_head(mls);
	multilist_sublist_unlock(mls);
	while (msp != NULL && allmem * zfs_metaslab_mem_limit / 100 <
	inuse * size) {
	VERIFY3P(mls, ==, multilist_sublist_lock(
	&mc->mc_metaslab_txg_list, idx));
	ASSERT3U(idx, ==,
	metaslab_idx_func(&mc->mc_metaslab_txg_list, msp));

	if (!multilist_link_active(&msp->ms_class_txg_node)) {
	multilist_sublist_unlock(mls);
	break;
	}
	metaslab_t *next_msp = multilist_sublist_next(mls, msp);
	multilist_sublist_unlock(mls);
	/*
	* If the metaslab is currently loading there are two
	* cases. If it's the metaslab we're evicting, we
	* can't continue on or we'll panic when we attempt to
	* recursively lock the mutex. If it's another
	* metaslab that's loading, it can be safely skipped,
	* since we know it's very new and therefore not a
	* good eviction candidate. We check later once the
	* lock is held that the metaslab is fully loaded
	* before actually unloading it.
	*/
	if (msp->ms_loading) {
	msp = next_msp;
	inuse =
	spl_kmem_cache_inuse(zfs_btree_leaf_cache);
	continue;
	}
	/*
	* We can't unload metaslabs with no spacemap because
	* they're not ready to be unloaded yet. We can't
	* unload metaslabs with outstanding allocations
	* because doing so could cause the metaslab's weight
	* to decrease while it's unloaded, which violates an
	* invariant that we use to prevent unnecessary
	* loading. We also don't unload metaslabs that are
	* currently active because they are high-weight
	* metaslabs that are likely to be used in the near
	* future.
	*/
	mutex_enter(&msp->ms_lock);
	if (msp->ms_allocator == -1 && msp->ms_sm != NULL &&
	msp->ms_allocating_total == 0) {
	metaslab_unload(msp);
	}
	mutex_exit(&msp->ms_lock);
	msp = next_msp;
	inuse = spl_kmem_cache_inuse(zfs_btree_leaf_cache);
	}
	}
	#endif
	}

	static int
	metaslab_load_impl(metaslab_t *msp)
	{
	int error = 0;

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	ASSERT(msp->ms_loading);
	ASSERT(!msp->ms_condensing);

	/*
	* We temporarily drop the lock to unblock other operations while we
	* are reading the space map. Therefore, metaslab_sync() and
	* metaslab_sync_done() can run at the same time as we do.
	*
	* If we are using the log space maps, metaslab_sync() can't write to
	* the metaslab's space map while we are loading as we only write to
	* it when we are flushing the metaslab, and that can't happen while
	* we are loading it.
	*
	* If we are not using log space maps though, metaslab_sync() can
	* append to the space map while we are loading. Therefore we load
	* only entries that existed when we started the load. Additionally,
	* metaslab_sync_done() has to wait for the load to complete because
	* there are potential races like metaslab_load() loading parts of the
	* space map that are currently being appended by metaslab_sync(). If
	* we didn't, the ms_allocatable would have entries that
	* metaslab_sync_done() would try to re-add later.
	*
	* That's why before dropping the lock we remember the synced length
	* of the metaslab and read up to that point of the space map,
	* ignoring entries appended by metaslab_sync() that happen after we
	* drop the lock.
	*/
	uint64_t length = msp->ms_synced_length;
	mutex_exit(&msp->ms_lock);

	hrtime_t load_start = gethrtime();
	metaslab_rt_arg_t *mrap;
	if (msp->ms_allocatable->rt_arg == NULL) {
	mrap = kmem_zalloc(sizeof (*mrap), KM_SLEEP);
	} else {
	mrap = msp->ms_allocatable->rt_arg;
	msp->ms_allocatable->rt_ops = NULL;
	msp->ms_allocatable->rt_arg = NULL;
	}
	mrap->mra_bt = &msp->ms_allocatable_by_size;
	mrap->mra_floor_shift = metaslab_by_size_min_shift;

	if (msp->ms_sm != NULL) {
	error = space_map_load_length(msp->ms_sm, msp->ms_allocatable,
	SM_FREE, length);

	/* Now, populate the size-sorted tree. */
	metaslab_rt_create(msp->ms_allocatable, mrap);
	msp->ms_allocatable->rt_ops = &metaslab_rt_ops;
	msp->ms_allocatable->rt_arg = mrap;

	struct mssa_arg arg = {0};
	arg.rt = msp->ms_allocatable;
	arg.mra = mrap;
	range_tree_walk(msp->ms_allocatable, metaslab_size_sorted_add,
	&arg);
	} else {
	/*
	* Add the size-sorted tree first, since we don't need to load
	* the metaslab from the spacemap.
	*/
	metaslab_rt_create(msp->ms_allocatable, mrap);
	msp->ms_allocatable->rt_ops = &metaslab_rt_ops;
	msp->ms_allocatable->rt_arg = mrap;
	/*
	* The space map has not been allocated yet, so treat
	* all the space in the metaslab as free and add it to the
	* ms_allocatable tree.
	*/
	range_tree_add(msp->ms_allocatable,
	msp->ms_start, msp->ms_size);

	if (msp->ms_new) {
	/*
	* If the ms_sm doesn't exist, this means that this
	* metaslab hasn't gone through metaslab_sync() and
	* thus has never been dirtied. So we shouldn't
	* expect any unflushed allocs or frees from previous
	* TXGs.
	*/
	ASSERT(range_tree_is_empty(msp->ms_unflushed_allocs));
	ASSERT(range_tree_is_empty(msp->ms_unflushed_frees));
	}
	}

	/*
	* We need to grab the ms_sync_lock to prevent metaslab_sync() from
	* changing the ms_sm (or log_sm) and the metaslab's range trees
	* while we are about to use them and populate the ms_allocatable.
	* The ms_lock is insufficient for this because metaslab_sync() doesn't
	* hold the ms_lock while writing the ms_checkpointing tree to disk.
	*/
	mutex_enter(&msp->ms_sync_lock);
	mutex_enter(&msp->ms_lock);

	ASSERT(!msp->ms_condensing);
	ASSERT(!msp->ms_flushing);

	if (error != 0) {
	mutex_exit(&msp->ms_sync_lock);
	return (error);
	}

	ASSERT3P(msp->ms_group, !=, NULL);
	msp->ms_loaded = B_TRUE;

	/*
	* Apply all the unflushed changes to ms_allocatable right
	* away so any manipulations we do below have a clear view
	* of what is allocated and what is free.
	*/
	range_tree_walk(msp->ms_unflushed_allocs,
	range_tree_remove, msp->ms_allocatable);
	range_tree_walk(msp->ms_unflushed_frees,
	range_tree_add, msp->ms_allocatable);

	ASSERT3P(msp->ms_group, !=, NULL);
	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;
	if (spa_syncing_log_sm(spa) != NULL) {
	ASSERT(spa_feature_is_enabled(spa,
	SPA_FEATURE_LOG_SPACEMAP));

	/*
	* If we use a log space map we add all the segments
	* that are in ms_unflushed_frees so they are available
	* for allocation.
	*
	* ms_allocatable needs to contain all free segments
	* that are ready for allocations (thus not segments
	* from ms_freeing, ms_freed, and the ms_defer trees).
	* But if we grab the lock in this code path at a sync
	* pass later that 1, then it also contains the
	* segments of ms_freed (they were added to it earlier
	* in this path through ms_unflushed_frees). So we
	* need to remove all the segments that exist in
	* ms_freed from ms_allocatable as they will be added
	* later in metaslab_sync_done().
	*
	* When there's no log space map, the ms_allocatable
	* correctly doesn't contain any segments that exist
	* in ms_freed [see ms_synced_length].
	*/
	range_tree_walk(msp->ms_freed,
	range_tree_remove, msp->ms_allocatable);
	}

	/*
	* If we are not using the log space map, ms_allocatable
	* contains the segments that exist in the ms_defer trees
	* [see ms_synced_length]. Thus we need to remove them
	* from ms_allocatable as they will be added again in
	* metaslab_sync_done().
	*
	* If we are using the log space map, ms_allocatable still
	* contains the segments that exist in the ms_defer trees.
	* Not because it read them through the ms_sm though. But
	* because these segments are part of ms_unflushed_frees
	* whose segments we add to ms_allocatable earlier in this
	* code path.
	*/
	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	range_tree_walk(msp->ms_defer[t],
	range_tree_remove, msp->ms_allocatable);
	}

	/*
	* Call metaslab_recalculate_weight_and_sort() now that the
	* metaslab is loaded so we get the metaslab's real weight.
	*
	* Unless this metaslab was created with older software and
	* has not yet been converted to use segment-based weight, we
	* expect the new weight to be better or equal to the weight
	* that the metaslab had while it was not loaded. This is
	* because the old weight does not take into account the
	* consolidation of adjacent segments between TXGs. [see
	* comment for ms_synchist and ms_deferhist[] for more info]
	*/
	uint64_t weight = msp->ms_weight;
	uint64_t max_size = msp->ms_max_size;
	metaslab_recalculate_weight_and_sort(msp);
	if (!WEIGHT_IS_SPACEBASED(weight))
	ASSERT3U(weight, <=, msp->ms_weight);
	msp->ms_max_size = metaslab_largest_allocatable(msp);
	ASSERT3U(max_size, <=, msp->ms_max_size);
	hrtime_t load_end = gethrtime();
	msp->ms_load_time = load_end;
	zfs_dbgmsg("metaslab_load: txg %llu, spa %s, vdev_id %llu, "
	"ms_id %llu, smp_length %llu, "
	"unflushed_allocs %llu, unflushed_frees %llu, "
	"freed %llu, defer %llu + %llu, unloaded time %llu ms, "
	"loading_time %lld ms, ms_max_size %llu, "
	"max size error %lld, "
	"old_weight %llx, new_weight %llx",
	(u_longlong_t)spa_syncing_txg(spa), spa_name(spa),
	(u_longlong_t)msp->ms_group->mg_vd->vdev_id,
	(u_longlong_t)msp->ms_id,
	(u_longlong_t)space_map_length(msp->ms_sm),
	(u_longlong_t)range_tree_space(msp->ms_unflushed_allocs),
	(u_longlong_t)range_tree_space(msp->ms_unflushed_frees),
	(u_longlong_t)range_tree_space(msp->ms_freed),
	(u_longlong_t)range_tree_space(msp->ms_defer[0]),
	(u_longlong_t)range_tree_space(msp->ms_defer[1]),
	(longlong_t)((load_start - msp->ms_unload_time) / 1000000),
	(longlong_t)((load_end - load_start) / 1000000),
	(u_longlong_t)msp->ms_max_size,
	(u_longlong_t)msp->ms_max_size - max_size,
	(u_longlong_t)weight, (u_longlong_t)msp->ms_weight);

	metaslab_verify_space(msp, spa_syncing_txg(spa));
	mutex_exit(&msp->ms_sync_lock);
	return (0);
	}

	int
	metaslab_load(metaslab_t *msp)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	/*
	* There may be another thread loading the same metaslab, if that's
	* the case just wait until the other thread is done and return.
	*/
	metaslab_load_wait(msp);
	if (msp->ms_loaded)
	return (0);
	VERIFY(!msp->ms_loading);
	ASSERT(!msp->ms_condensing);

	/*
	* We set the loading flag BEFORE potentially dropping the lock to
	* wait for an ongoing flush (see ms_flushing below). This way other
	* threads know that there is already a thread that is loading this
	* metaslab.
	*/
	msp->ms_loading = B_TRUE;

	/*
	* Wait for any in-progress flushing to finish as we drop the ms_lock
	* both here (during space_map_load()) and in metaslab_flush() (when
	* we flush our changes to the ms_sm).
	*/
	if (msp->ms_flushing)
	metaslab_flush_wait(msp);

	/*
	* In the possibility that we were waiting for the metaslab to be
	* flushed (where we temporarily dropped the ms_lock), ensure that
	* no one else loaded the metaslab somehow.
	*/
	ASSERT(!msp->ms_loaded);

	/*
	* If we're loading a metaslab in the normal class, consider evicting
	* another one to keep our memory usage under the limit defined by the
	* zfs_metaslab_mem_limit tunable.
	*/
	if (spa_normal_class(msp->ms_group->mg_class->mc_spa) ==
	msp->ms_group->mg_class) {
	metaslab_potentially_evict(msp->ms_group->mg_class);
	}

	int error = metaslab_load_impl(msp);

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	msp->ms_loading = B_FALSE;
	cv_broadcast(&msp->ms_load_cv);

	return (error);
	}

	void
	metaslab_unload(metaslab_t *msp)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	/*
	* This can happen if a metaslab is selected for eviction (in
	* metaslab_potentially_evict) and then unloaded during spa_sync (via
	* metaslab_class_evict_old).
	*/
	if (!msp->ms_loaded)
	return;

	range_tree_vacate(msp->ms_allocatable, NULL, NULL);
	msp->ms_loaded = B_FALSE;
	msp->ms_unload_time = gethrtime();

	msp->ms_activation_weight = 0;
	msp->ms_weight &= ~METASLAB_ACTIVE_MASK;

	if (msp->ms_group != NULL) {
	metaslab_class_t *mc = msp->ms_group->mg_class;
	multilist_sublist_t *mls =
	multilist_sublist_lock_obj(&mc->mc_metaslab_txg_list, msp);
	if (multilist_link_active(&msp->ms_class_txg_node))
	multilist_sublist_remove(mls, msp);
	multilist_sublist_unlock(mls);

	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;
	zfs_dbgmsg("metaslab_unload: txg %llu, spa %s, vdev_id %llu, "
	"ms_id %llu, weight %llx, "
	"selected txg %llu (%llu ms ago), alloc_txg %llu, "
	"loaded %llu ms ago, max_size %llu",
	(u_longlong_t)spa_syncing_txg(spa), spa_name(spa),
	(u_longlong_t)msp->ms_group->mg_vd->vdev_id,
	(u_longlong_t)msp->ms_id,
	(u_longlong_t)msp->ms_weight,
	(u_longlong_t)msp->ms_selected_txg,
	(u_longlong_t)(msp->ms_unload_time -
	msp->ms_selected_time) / 1000 / 1000,
	(u_longlong_t)msp->ms_alloc_txg,
	(u_longlong_t)(msp->ms_unload_time -
	msp->ms_load_time) / 1000 / 1000,
	(u_longlong_t)msp->ms_max_size);
	}

	/*
	* We explicitly recalculate the metaslab's weight based on its space
	* map (as it is now not loaded). We want unload metaslabs to always
	* have their weights calculated from the space map histograms, while
	* loaded ones have it calculated from their in-core range tree
	* [see metaslab_load()]. This way, the weight reflects the information
	* available in-core, whether it is loaded or not.
	*
	* If ms_group == NULL means that we came here from metaslab_fini(),
	* at which point it doesn't make sense for us to do the recalculation
	* and the sorting.
	*/
	if (msp->ms_group != NULL)
	metaslab_recalculate_weight_and_sort(msp);
	}

	/*
	* We want to optimize the memory use of the per-metaslab range
	* trees. To do this, we store the segments in the range trees in
	* units of sectors, zero-indexing from the start of the metaslab. If
	* the vdev_ms_shift - the vdev_ashift is less than 32, we can store
	* the ranges using two uint32_ts, rather than two uint64_ts.
	*/
	range_seg_type_t
	metaslab_calculate_range_tree_type(vdev_t vdev, metaslab_t msp,
	uint64_t start, uint64_t shift)
	{
	if (vdev->vdev_ms_shift - vdev->vdev_ashift < 32 &&
	!zfs_metaslab_force_large_segs) {
	*shift = vdev->vdev_ashift;
	*start = msp->ms_start;
	return (RANGE_SEG32);
	} else {
	*shift = 0;
	*start = 0;
	return (RANGE_SEG64);
	}
	}

	void
	metaslab_set_selected_txg(metaslab_t *msp, uint64_t txg)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));
	metaslab_class_t *mc = msp->ms_group->mg_class;
	multilist_sublist_t *mls =
	multilist_sublist_lock_obj(&mc->mc_metaslab_txg_list, msp);
	if (multilist_link_active(&msp->ms_class_txg_node))
	multilist_sublist_remove(mls, msp);
	msp->ms_selected_txg = txg;
	msp->ms_selected_time = gethrtime();
	multilist_sublist_insert_tail(mls, msp);
	multilist_sublist_unlock(mls);
	}

	void
	metaslab_space_update(vdev_t vd, metaslab_class_t mc, int64_t alloc_delta,
	int64_t defer_delta, int64_t space_delta)
	{
	vdev_space_update(vd, alloc_delta, defer_delta, space_delta);

	ASSERT3P(vd->vdev_spa->spa_root_vdev, ==, vd->vdev_parent);
	ASSERT(vd->vdev_ms_count != 0);

	metaslab_class_space_update(mc, alloc_delta, defer_delta, space_delta,
	vdev_deflated_space(vd, space_delta));
	}

	int
	metaslab_init(metaslab_group_t *mg, uint64_t id, uint64_t object,
	uint64_t txg, metaslab_t **msp)
	{
	vdev_t *vd = mg->mg_vd;
	spa_t *spa = vd->vdev_spa;
	objset_t *mos = spa->spa_meta_objset;
	metaslab_t *ms;
	int error;

	ms = kmem_zalloc(sizeof (metaslab_t), KM_SLEEP);
	mutex_init(&ms->ms_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&ms->ms_sync_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&ms->ms_load_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&ms->ms_flush_cv, NULL, CV_DEFAULT, NULL);
	multilist_link_init(&ms->ms_class_txg_node);

	ms->ms_id = id;
	ms->ms_start = id << vd->vdev_ms_shift;
	ms->ms_size = 1ULL << vd->vdev_ms_shift;
	ms->ms_allocator = -1;
	ms->ms_new = B_TRUE;

	vdev_ops_t *ops = vd->vdev_ops;
	if (ops->vdev_op_metaslab_init != NULL)
	ops->vdev_op_metaslab_init(vd, &ms->ms_start, &ms->ms_size);

	/*
	* We only open space map objects that already exist. All others
	* will be opened when we finally allocate an object for it.
	*
	* Note:
	* When called from vdev_expand(), we can't call into the DMU as
	* we are holding the spa_config_lock as a writer and we would
	* deadlock [see relevant comment in vdev_metaslab_init()]. in
	* that case, the object parameter is zero though, so we won't
	* call into the DMU.
	*/
	if (object != 0) {
	error = space_map_open(&ms->ms_sm, mos, object, ms->ms_start,
	ms->ms_size, vd->vdev_ashift);

	if (error != 0) {
	kmem_free(ms, sizeof (metaslab_t));
	return (error);
	}

	ASSERT(ms->ms_sm != NULL);
	ms->ms_allocated_space = space_map_allocated(ms->ms_sm);
	}

	uint64_t shift, start;
	range_seg_type_t type =
	metaslab_calculate_range_tree_type(vd, ms, &start, &shift);

	ms->ms_allocatable = range_tree_create(NULL, type, NULL, start, shift);
	for (int t = 0; t < TXG_SIZE; t++) {
	ms->ms_allocating[t] = range_tree_create(NULL, type,
	NULL, start, shift);
	}
	ms->ms_freeing = range_tree_create(NULL, type, NULL, start, shift);
	ms->ms_freed = range_tree_create(NULL, type, NULL, start, shift);
	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	ms->ms_defer[t] = range_tree_create(NULL, type, NULL,
	start, shift);
	}
	ms->ms_checkpointing =
	range_tree_create(NULL, type, NULL, start, shift);
	ms->ms_unflushed_allocs =
	range_tree_create(NULL, type, NULL, start, shift);

	metaslab_rt_arg_t mrap = kmem_zalloc(sizeof (mrap), KM_SLEEP);
	mrap->mra_bt = &ms->ms_unflushed_frees_by_size;
	mrap->mra_floor_shift = metaslab_by_size_min_shift;
	ms->ms_unflushed_frees = range_tree_create(&metaslab_rt_ops,
	type, mrap, start, shift);

	ms->ms_trim = range_tree_create(NULL, type, NULL, start, shift);

	metaslab_group_add(mg, ms);
	metaslab_set_fragmentation(ms, B_FALSE);

	/*
	* If we're opening an existing pool (txg == 0) or creating
	* a new one (txg == TXG_INITIAL), all space is available now.
	* If we're adding space to an existing pool, the new space
	* does not become available until after this txg has synced.
	* The metaslab's weight will also be initialized when we sync
	* out this txg. This ensures that we don't attempt to allocate
	* from it before we have initialized it completely.
	*/
	if (txg <= TXG_INITIAL) {
	metaslab_sync_done(ms, 0);
	metaslab_space_update(vd, mg->mg_class,
	metaslab_allocated_space(ms), 0, 0);
	}

	if (txg != 0) {
	vdev_dirty(vd, 0, NULL, txg);
	vdev_dirty(vd, VDD_METASLAB, ms, txg);
	}

	*msp = ms;

	return (0);
	}

	static void
	metaslab_fini_flush_data(metaslab_t *msp)
	{
	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;

	if (metaslab_unflushed_txg(msp) == 0) {
	ASSERT3P(avl_find(&spa->spa_metaslabs_by_flushed, msp, NULL),
	==, NULL);
	return;
	}
	ASSERT(spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP));

	mutex_enter(&spa->spa_flushed_ms_lock);
	avl_remove(&spa->spa_metaslabs_by_flushed, msp);
	mutex_exit(&spa->spa_flushed_ms_lock);

	spa_log_sm_decrement_mscount(spa, metaslab_unflushed_txg(msp));
	spa_log_summary_decrement_mscount(spa, metaslab_unflushed_txg(msp));
	}

	uint64_t
	metaslab_unflushed_changes_memused(metaslab_t *ms)
	{
	return ((range_tree_numsegs(ms->ms_unflushed_allocs) +
	range_tree_numsegs(ms->ms_unflushed_frees)) *
	ms->ms_unflushed_allocs->rt_root.bt_elem_size);
	}

	void
	metaslab_fini(metaslab_t *msp)
	{
	metaslab_group_t *mg = msp->ms_group;
	vdev_t *vd = mg->mg_vd;
	spa_t *spa = vd->vdev_spa;

	metaslab_fini_flush_data(msp);

	metaslab_group_remove(mg, msp);

	mutex_enter(&msp->ms_lock);
	VERIFY(msp->ms_group == NULL);

	/*
	* If this metaslab hasn't been through metaslab_sync_done() yet its
	* space hasn't been accounted for in its vdev and doesn't need to be
	* subtracted.
	*/
	if (!msp->ms_new) {
	metaslab_space_update(vd, mg->mg_class,
	-metaslab_allocated_space(msp), 0, -msp->ms_size);

	}
	space_map_close(msp->ms_sm);
	msp->ms_sm = NULL;

	metaslab_unload(msp);

	range_tree_destroy(msp->ms_allocatable);
	range_tree_destroy(msp->ms_freeing);
	range_tree_destroy(msp->ms_freed);

	ASSERT3U(spa->spa_unflushed_stats.sus_memused, >=,
	metaslab_unflushed_changes_memused(msp));
	spa->spa_unflushed_stats.sus_memused -=
	metaslab_unflushed_changes_memused(msp);
	range_tree_vacate(msp->ms_unflushed_allocs, NULL, NULL);
	range_tree_destroy(msp->ms_unflushed_allocs);
	range_tree_destroy(msp->ms_checkpointing);
	range_tree_vacate(msp->ms_unflushed_frees, NULL, NULL);
	range_tree_destroy(msp->ms_unflushed_frees);

	for (int t = 0; t < TXG_SIZE; t++) {
	range_tree_destroy(msp->ms_allocating[t]);
	}
	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	range_tree_destroy(msp->ms_defer[t]);
	}
	ASSERT0(msp->ms_deferspace);

	for (int t = 0; t < TXG_SIZE; t++)
	ASSERT(!txg_list_member(&vd->vdev_ms_list, msp, t));

	range_tree_vacate(msp->ms_trim, NULL, NULL);
	range_tree_destroy(msp->ms_trim);

	mutex_exit(&msp->ms_lock);
	cv_destroy(&msp->ms_load_cv);
	cv_destroy(&msp->ms_flush_cv);
	mutex_destroy(&msp->ms_lock);
	mutex_destroy(&msp->ms_sync_lock);
	ASSERT3U(msp->ms_allocator, ==, -1);

	kmem_free(msp, sizeof (metaslab_t));
	}

	#define FRAGMENTATION_TABLE_SIZE 17

	/*
	* This table defines a segment size based fragmentation metric that will
	* allow each metaslab to derive its own fragmentation value. This is done
	* by calculating the space in each bucket of the spacemap histogram and
	* multiplying that by the fragmentation metric in this table. Doing
	* this for all buckets and dividing it by the total amount of free
	* space in this metaslab (i.e. the total free space in all buckets) gives
	* us the fragmentation metric. This means that a high fragmentation metric
	* equates to most of the free space being comprised of small segments.
	* Conversely, if the metric is low, then most of the free space is in
	* large segments. A 10% change in fragmentation equates to approximately
	* double the number of segments.
	*
	* This table defines 0% fragmented space using 16MB segments. Testing has
	* shown that segments that are greater than or equal to 16MB do not suffer
	* from drastic performance problems. Using this value, we derive the rest
	* of the table. Since the fragmentation value is never stored on disk, it
	* is possible to change these calculations in the future.
	*/
	int zfs_frag_table[FRAGMENTATION_TABLE_SIZE] = {
	100, /* 512B */
	100, /* 1K */
	98, /* 2K */
	95, /* 4K */
	90, /* 8K */
	80, /* 16K */
	70, /* 32K */
	60, /* 64K */
	50, /* 128K */
	40, /* 256K */
	30, /* 512K */
	20, /* 1M */
	15, /* 2M */
	10, /* 4M */
	5, /* 8M */
	0 /* 16M */
	};

	/*
	* Calculate the metaslab's fragmentation metric and set ms_fragmentation.
	* Setting this value to ZFS_FRAG_INVALID means that the metaslab has not
	* been upgraded and does not support this metric. Otherwise, the return
	* value should be in the range [0, 100].
	*/
	static void
	metaslab_set_fragmentation(metaslab_t *msp, boolean_t nodirty)
	{
	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;
	uint64_t fragmentation = 0;
	uint64_t total = 0;
	boolean_t feature_enabled = spa_feature_is_enabled(spa,
	SPA_FEATURE_SPACEMAP_HISTOGRAM);

	if (!feature_enabled) {
	msp->ms_fragmentation = ZFS_FRAG_INVALID;
	return;
	}

	/*
	* A null space map means that the entire metaslab is free
	* and thus is not fragmented.
	*/
	if (msp->ms_sm == NULL) {
	msp->ms_fragmentation = 0;
	return;
	}

	/*
	* If this metaslab's space map has not been upgraded, flag it
	* so that we upgrade next time we encounter it.
	*/
	if (msp->ms_sm->sm_dbuf->db_size != sizeof (space_map_phys_t)) {
	uint64_t txg = spa_syncing_txg(spa);
	vdev_t *vd = msp->ms_group->mg_vd;

	/*
	* If we've reached the final dirty txg, then we must
	* be shutting down the pool. We don't want to dirty
	* any data past this point so skip setting the condense
	* flag. We can retry this action the next time the pool
	* is imported. We also skip marking this metaslab for
	* condensing if the caller has explicitly set nodirty.
	*/
	if (!nodirty &&
	spa_writeable(spa) && txg < spa_final_dirty_txg(spa)) {
	msp->ms_condense_wanted = B_TRUE;
	vdev_dirty(vd, VDD_METASLAB, msp, txg + 1);
	zfs_dbgmsg("txg %llu, requesting force condense: "
	"ms_id %llu, vdev_id %llu", (u_longlong_t)txg,
	(u_longlong_t)msp->ms_id,
	(u_longlong_t)vd->vdev_id);
	}
	msp->ms_fragmentation = ZFS_FRAG_INVALID;
	return;
	}

	for (int i = 0; i < SPACE_MAP_HISTOGRAM_SIZE; i++) {
	uint64_t space = 0;
	uint8_t shift = msp->ms_sm->sm_shift;

	int idx = MIN(shift - SPA_MINBLOCKSHIFT + i,
	FRAGMENTATION_TABLE_SIZE - 1);

	if (msp->ms_sm->sm_phys->smp_histogram[i] == 0)
	continue;

	space = msp->ms_sm->sm_phys->smp_histogram[i] << (i + shift);
	total += space;

	ASSERT3U(idx, <, FRAGMENTATION_TABLE_SIZE);
	fragmentation += space * zfs_frag_table[idx];
	}

	if (total > 0)
	fragmentation /= total;
	ASSERT3U(fragmentation, <=, 100);

	msp->ms_fragmentation = fragmentation;
	}

	/*
	* Compute a weight -- a selection preference value -- for the given metaslab.
	* This is based on the amount of free space, the level of fragmentation,
	* the LBA range, and whether the metaslab is loaded.
	*/
	static uint64_t
	metaslab_space_weight(metaslab_t *msp)
	{
	metaslab_group_t *mg = msp->ms_group;
	vdev_t *vd = mg->mg_vd;
	uint64_t weight, space;

	ASSERT(MUTEX_HELD(&msp->ms_lock));

	/*
	* The baseline weight is the metaslab's free space.
	*/
	space = msp->ms_size - metaslab_allocated_space(msp);

	if (metaslab_fragmentation_factor_enabled &&
	msp->ms_fragmentation != ZFS_FRAG_INVALID) {
	/*
	* Use the fragmentation information to inversely scale
	* down the baseline weight. We need to ensure that we
	* don't exclude this metaslab completely when it's 100%
	* fragmented. To avoid this we reduce the fragmented value
	* by 1.
	*/
	space = (space * (100 - (msp->ms_fragmentation - 1))) / 100;

	/*
	* If space < SPA_MINBLOCKSIZE, then we will not allocate from
	* this metaslab again. The fragmentation metric may have
	* decreased the space to something smaller than
	* SPA_MINBLOCKSIZE, so reset the space to SPA_MINBLOCKSIZE
	* so that we can consume any remaining space.
	*/
	if (space > 0 && space < SPA_MINBLOCKSIZE)
	space = SPA_MINBLOCKSIZE;
	}
	weight = space;

	/*
	* Modern disks have uniform bit density and constant angular velocity.
	* Therefore, the outer recording zones are faster (higher bandwidth)
	* than the inner zones by the ratio of outer to inner track diameter,
	* which is typically around 2:1. We account for this by assigning
	* higher weight to lower metaslabs (multiplier ranging from 2x to 1x).
	* In effect, this means that we'll select the metaslab with the most
	* free bandwidth rather than simply the one with the most free space.
	*/
	if (!vd->vdev_nonrot && metaslab_lba_weighting_enabled) {
	weight = 2 * weight - (msp->ms_id * weight) / vd->vdev_ms_count;
	ASSERT(weight >= space && weight <= 2 * space);
	}

	/*
	* If this metaslab is one we're actively using, adjust its
	* weight to make it preferable to any inactive metaslab so
	* we'll polish it off. If the fragmentation on this metaslab
	* has exceed our threshold, then don't mark it active.
	*/
	if (msp->ms_loaded && msp->ms_fragmentation != ZFS_FRAG_INVALID &&
	msp->ms_fragmentation <= zfs_metaslab_fragmentation_threshold) {
	weight \|= (msp->ms_weight & METASLAB_ACTIVE_MASK);
	}

	WEIGHT_SET_SPACEBASED(weight);
	return (weight);
	}

	/*
	* Return the weight of the specified metaslab, according to the segment-based
	* weighting algorithm. The metaslab must be loaded. This function can
	* be called within a sync pass since it relies only on the metaslab's
	* range tree which is always accurate when the metaslab is loaded.
	*/
	static uint64_t
	metaslab_weight_from_range_tree(metaslab_t *msp)
	{
	uint64_t weight = 0;
	uint32_t segments = 0;

	ASSERT(msp->ms_loaded);

	for (int i = RANGE_TREE_HISTOGRAM_SIZE - 1; i >= SPA_MINBLOCKSHIFT;
	i--) {
	uint8_t shift = msp->ms_group->mg_vd->vdev_ashift;
	int max_idx = SPACE_MAP_HISTOGRAM_SIZE + shift - 1;

	segments <<= 1;
	segments += msp->ms_allocatable->rt_histogram[i];

	/*
	* The range tree provides more precision than the space map
	* and must be downgraded so that all values fit within the
	* space map's histogram. This allows us to compare loaded
	* vs. unloaded metaslabs to determine which metaslab is
	* considered "best".
	*/
	if (i > max_idx)
	continue;

	if (segments != 0) {
	WEIGHT_SET_COUNT(weight, segments);
	WEIGHT_SET_INDEX(weight, i);
	WEIGHT_SET_ACTIVE(weight, 0);
	break;
	}
	}
	return (weight);
	}

	/*
	* Calculate the weight based on the on-disk histogram. Should be applied
	* only to unloaded metaslabs (i.e no incoming allocations) in-order to
	* give results consistent with the on-disk state
	*/
	static uint64_t
	metaslab_weight_from_spacemap(metaslab_t *msp)
	{
	space_map_t *sm = msp->ms_sm;
	ASSERT(!msp->ms_loaded);
	ASSERT(sm != NULL);
	ASSERT3U(space_map_object(sm), !=, 0);
	ASSERT3U(sm->sm_dbuf->db_size, ==, sizeof (space_map_phys_t));

	/*
	* Create a joint histogram from all the segments that have made
	* it to the metaslab's space map histogram, that are not yet
	* available for allocation because they are still in the freeing
	* pipeline (e.g. freeing, freed, and defer trees). Then subtract
	* these segments from the space map's histogram to get a more
	* accurate weight.
	*/
	uint64_t deferspace_histogram[SPACE_MAP_HISTOGRAM_SIZE] = {0};
	for (int i = 0; i < SPACE_MAP_HISTOGRAM_SIZE; i++)
	deferspace_histogram[i] += msp->ms_synchist[i];
	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	for (int i = 0; i < SPACE_MAP_HISTOGRAM_SIZE; i++) {
	deferspace_histogram[i] += msp->ms_deferhist[t][i];
	}
	}

	uint64_t weight = 0;
	for (int i = SPACE_MAP_HISTOGRAM_SIZE - 1; i >= 0; i--) {
	ASSERT3U(sm->sm_phys->smp_histogram[i], >=,
	deferspace_histogram[i]);
	uint64_t count =
	sm->sm_phys->smp_histogram[i] - deferspace_histogram[i];
	if (count != 0) {
	WEIGHT_SET_COUNT(weight, count);
	WEIGHT_SET_INDEX(weight, i + sm->sm_shift);
	WEIGHT_SET_ACTIVE(weight, 0);
	break;
	}
	}
	return (weight);
	}

	/*
	* Compute a segment-based weight for the specified metaslab. The weight
	* is determined by highest bucket in the histogram. The information
	* for the highest bucket is encoded into the weight value.
	*/
	static uint64_t
	metaslab_segment_weight(metaslab_t *msp)
	{
	metaslab_group_t *mg = msp->ms_group;
	uint64_t weight = 0;
	uint8_t shift = mg->mg_vd->vdev_ashift;

	ASSERT(MUTEX_HELD(&msp->ms_lock));

	/*
	* The metaslab is completely free.
	*/
	if (metaslab_allocated_space(msp) == 0) {
	int idx = highbit64(msp->ms_size) - 1;
	int max_idx = SPACE_MAP_HISTOGRAM_SIZE + shift - 1;

	if (idx < max_idx) {
	WEIGHT_SET_COUNT(weight, 1ULL);
	WEIGHT_SET_INDEX(weight, idx);
	} else {
	WEIGHT_SET_COUNT(weight, 1ULL << (idx - max_idx));
	WEIGHT_SET_INDEX(weight, max_idx);
	}
	WEIGHT_SET_ACTIVE(weight, 0);
	ASSERT(!WEIGHT_IS_SPACEBASED(weight));
	return (weight);
	}

	ASSERT3U(msp->ms_sm->sm_dbuf->db_size, ==, sizeof (space_map_phys_t));

	/*
	* If the metaslab is fully allocated then just make the weight 0.
	*/
	if (metaslab_allocated_space(msp) == msp->ms_size)
	return (0);
	/*
	* If the metaslab is already loaded, then use the range tree to
	* determine the weight. Otherwise, we rely on the space map information
	* to generate the weight.
	*/
	if (msp->ms_loaded) {
	weight = metaslab_weight_from_range_tree(msp);
	} else {
	weight = metaslab_weight_from_spacemap(msp);
	}

	/*
	* If the metaslab was active the last time we calculated its weight
	* then keep it active. We want to consume the entire region that
	* is associated with this weight.
	*/
	if (msp->ms_activation_weight != 0 && weight != 0)
	WEIGHT_SET_ACTIVE(weight, WEIGHT_GET_ACTIVE(msp->ms_weight));
	return (weight);
	}

	/*
	* Determine if we should attempt to allocate from this metaslab. If the
	* metaslab is loaded, then we can determine if the desired allocation
	* can be satisfied by looking at the size of the maximum free segment
	* on that metaslab. Otherwise, we make our decision based on the metaslab's
	* weight. For segment-based weighting we can determine the maximum
	* allocation based on the index encoded in its value. For space-based
	* weights we rely on the entire weight (excluding the weight-type bit).
	*/
	static boolean_t
	metaslab_should_allocate(metaslab_t *msp, uint64_t asize, boolean_t try_hard)
	{
	/*
	* If the metaslab is loaded, ms_max_size is definitive and we can use
	* the fast check. If it's not, the ms_max_size is a lower bound (once
	* set), and we should use the fast check as long as we're not in
	* try_hard and it's been less than zfs_metaslab_max_size_cache_sec
	* seconds since the metaslab was unloaded.
	*/
	if (msp->ms_loaded \|\|
	(msp->ms_max_size != 0 && !try_hard && gethrtime() <
	msp->ms_unload_time + SEC2NSEC(zfs_metaslab_max_size_cache_sec)))
	return (msp->ms_max_size >= asize);

	boolean_t should_allocate;
	if (!WEIGHT_IS_SPACEBASED(msp->ms_weight)) {
	/*
	* The metaslab segment weight indicates segments in the
	* range [2^i, 2^(i+1)), where i is the index in the weight.
	* Since the asize might be in the middle of the range, we
	* should attempt the allocation if asize < 2^(i+1).
	*/
	should_allocate = (asize <
	1ULL << (WEIGHT_GET_INDEX(msp->ms_weight) + 1));
	} else {
	should_allocate = (asize <=
	(msp->ms_weight & ~METASLAB_WEIGHT_TYPE));
	}

	return (should_allocate);
	}

	static uint64_t
	metaslab_weight(metaslab_t *msp, boolean_t nodirty)
	{
	vdev_t *vd = msp->ms_group->mg_vd;
	spa_t *spa = vd->vdev_spa;
	uint64_t weight;

	ASSERT(MUTEX_HELD(&msp->ms_lock));

	metaslab_set_fragmentation(msp, nodirty);

	/*
	* Update the maximum size. If the metaslab is loaded, this will
	* ensure that we get an accurate maximum size if newly freed space
	* has been added back into the free tree. If the metaslab is
	* unloaded, we check if there's a larger free segment in the
	* unflushed frees. This is a lower bound on the largest allocatable
	* segment size. Coalescing of adjacent entries may reveal larger
	* allocatable segments, but we aren't aware of those until loading
	* the space map into a range tree.
	*/
	if (msp->ms_loaded) {
	msp->ms_max_size = metaslab_largest_allocatable(msp);
	} else {
	msp->ms_max_size = MAX(msp->ms_max_size,
	metaslab_largest_unflushed_free(msp));
	}

	/*
	* Segment-based weighting requires space map histogram support.
	*/
	if (zfs_metaslab_segment_weight_enabled &&
	spa_feature_is_enabled(spa, SPA_FEATURE_SPACEMAP_HISTOGRAM) &&
	(msp->ms_sm == NULL \|\| msp->ms_sm->sm_dbuf->db_size ==
	sizeof (space_map_phys_t))) {
	weight = metaslab_segment_weight(msp);
	} else {
	weight = metaslab_space_weight(msp);
	}
	return (weight);
	}

	void
	metaslab_recalculate_weight_and_sort(metaslab_t *msp)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	/* note: we preserve the mask (e.g. indication of primary, etc..) */
	uint64_t was_active = msp->ms_weight & METASLAB_ACTIVE_MASK;
	metaslab_group_sort(msp->ms_group, msp,
	metaslab_weight(msp, B_FALSE) \| was_active);
	}

	static int
	metaslab_activate_allocator(metaslab_group_t mg, metaslab_t msp,
	int allocator, uint64_t activation_weight)
	{
	metaslab_group_allocator_t *mga = &mg->mg_allocator[allocator];
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	/*
	* If we're activating for the claim code, we don't want to actually
	* set the metaslab up for a specific allocator.
	*/
	if (activation_weight == METASLAB_WEIGHT_CLAIM) {
	ASSERT0(msp->ms_activation_weight);
	msp->ms_activation_weight = msp->ms_weight;
	metaslab_group_sort(mg, msp, msp->ms_weight \|
	activation_weight);
	return (0);
	}

	metaslab_t **mspp = (activation_weight == METASLAB_WEIGHT_PRIMARY ?
	&mga->mga_primary : &mga->mga_secondary);

	mutex_enter(&mg->mg_lock);
	if (*mspp != NULL) {
	mutex_exit(&mg->mg_lock);
	return (EEXIST);
	}

	*mspp = msp;
	ASSERT3S(msp->ms_allocator, ==, -1);
	msp->ms_allocator = allocator;
	msp->ms_primary = (activation_weight == METASLAB_WEIGHT_PRIMARY);

	ASSERT0(msp->ms_activation_weight);
	msp->ms_activation_weight = msp->ms_weight;
	metaslab_group_sort_impl(mg, msp,
	msp->ms_weight \| activation_weight);
	mutex_exit(&mg->mg_lock);

	return (0);
	}

	static int
	metaslab_activate(metaslab_t *msp, int allocator, uint64_t activation_weight)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	/*
	* The current metaslab is already activated for us so there
	* is nothing to do. Already activated though, doesn't mean
	* that this metaslab is activated for our allocator nor our
	* requested activation weight. The metaslab could have started
	* as an active one for our allocator but changed allocators
	* while we were waiting to grab its ms_lock or we stole it
	* [see find_valid_metaslab()]. This means that there is a
	* possibility of passivating a metaslab of another allocator
	* or from a different activation mask, from this thread.
	*/
	if ((msp->ms_weight & METASLAB_ACTIVE_MASK) != 0) {
	ASSERT(msp->ms_loaded);
	return (0);
	}

	int error = metaslab_load(msp);
	if (error != 0) {
	metaslab_group_sort(msp->ms_group, msp, 0);
	return (error);
	}

	/*
	* When entering metaslab_load() we may have dropped the
	* ms_lock because we were loading this metaslab, or we
	* were waiting for another thread to load it for us. In
	* that scenario, we recheck the weight of the metaslab
	* to see if it was activated by another thread.
	*
	* If the metaslab was activated for another allocator or
	* it was activated with a different activation weight (e.g.
	* we wanted to make it a primary but it was activated as
	* secondary) we return error (EBUSY).
	*
	* If the metaslab was activated for the same allocator
	* and requested activation mask, skip activating it.
	*/
	if ((msp->ms_weight & METASLAB_ACTIVE_MASK) != 0) {
	if (msp->ms_allocator != allocator)
	return (EBUSY);

	if ((msp->ms_weight & activation_weight) == 0)
	return (SET_ERROR(EBUSY));

	EQUIV((activation_weight == METASLAB_WEIGHT_PRIMARY),
	msp->ms_primary);
	return (0);
	}

	/*
	* If the metaslab has literally 0 space, it will have weight 0. In
	* that case, don't bother activating it. This can happen if the
	* metaslab had space during find_valid_metaslab, but another thread
	* loaded it and used all that space while we were waiting to grab the
	* lock.
	*/
	if (msp->ms_weight == 0) {
	ASSERT0(range_tree_space(msp->ms_allocatable));
	return (SET_ERROR(ENOSPC));
	}

	if ((error = metaslab_activate_allocator(msp->ms_group, msp,
	allocator, activation_weight)) != 0) {
	return (error);
	}

	ASSERT(msp->ms_loaded);
	ASSERT(msp->ms_weight & METASLAB_ACTIVE_MASK);

	return (0);
	}

	static void
	metaslab_passivate_allocator(metaslab_group_t mg, metaslab_t msp,
	uint64_t weight)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));
	ASSERT(msp->ms_loaded);

	if (msp->ms_weight & METASLAB_WEIGHT_CLAIM) {
	metaslab_group_sort(mg, msp, weight);
	return;
	}

	mutex_enter(&mg->mg_lock);
	ASSERT3P(msp->ms_group, ==, mg);
	ASSERT3S(0, <=, msp->ms_allocator);
	ASSERT3U(msp->ms_allocator, <, mg->mg_allocators);

	metaslab_group_allocator_t *mga = &mg->mg_allocator[msp->ms_allocator];
	if (msp->ms_primary) {
	ASSERT3P(mga->mga_primary, ==, msp);
	ASSERT(msp->ms_weight & METASLAB_WEIGHT_PRIMARY);
	mga->mga_primary = NULL;
	} else {
	ASSERT3P(mga->mga_secondary, ==, msp);
	ASSERT(msp->ms_weight & METASLAB_WEIGHT_SECONDARY);
	mga->mga_secondary = NULL;
	}
	msp->ms_allocator = -1;
	metaslab_group_sort_impl(mg, msp, weight);
	mutex_exit(&mg->mg_lock);
	}

	static void
	metaslab_passivate(metaslab_t *msp, uint64_t weight)
	{
	uint64_t size __maybe_unused = weight & ~METASLAB_WEIGHT_TYPE;

	/*
	* If size < SPA_MINBLOCKSIZE, then we will not allocate from
	* this metaslab again. In that case, it had better be empty,
	* or we would be leaving space on the table.
	*/
	ASSERT(!WEIGHT_IS_SPACEBASED(msp->ms_weight) \|\|
	size >= SPA_MINBLOCKSIZE \|\|
	range_tree_space(msp->ms_allocatable) == 0);
	ASSERT0(weight & METASLAB_ACTIVE_MASK);

	ASSERT(msp->ms_activation_weight != 0);
	msp->ms_activation_weight = 0;
	metaslab_passivate_allocator(msp->ms_group, msp, weight);
	ASSERT0(msp->ms_weight & METASLAB_ACTIVE_MASK);
	}

	/*
	* Segment-based metaslabs are activated once and remain active until
	* we either fail an allocation attempt (similar to space-based metaslabs)
	* or have exhausted the free space in zfs_metaslab_switch_threshold
	* buckets since the metaslab was activated. This function checks to see
	* if we've exhausted the zfs_metaslab_switch_threshold buckets in the
	* metaslab and passivates it proactively. This will allow us to select a
	* metaslab with a larger contiguous region, if any, remaining within this
	* metaslab group. If we're in sync pass > 1, then we continue using this
	* metaslab so that we don't dirty more block and cause more sync passes.
	*/
	static void
	metaslab_segment_may_passivate(metaslab_t *msp)
	{
	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;

	if (WEIGHT_IS_SPACEBASED(msp->ms_weight) \|\| spa_sync_pass(spa) > 1)
	return;

	/*
	* Since we are in the middle of a sync pass, the most accurate
	* information that is accessible to us is the in-core range tree
	* histogram; calculate the new weight based on that information.
	*/
	uint64_t weight = metaslab_weight_from_range_tree(msp);
	int activation_idx = WEIGHT_GET_INDEX(msp->ms_activation_weight);
	int current_idx = WEIGHT_GET_INDEX(weight);

	if (current_idx <= activation_idx - zfs_metaslab_switch_threshold)
	metaslab_passivate(msp, weight);
	}

	static void
	metaslab_preload(void *arg)
	{
	metaslab_t *msp = arg;
	metaslab_class_t *mc = msp->ms_group->mg_class;
	spa_t *spa = mc->mc_spa;
	fstrans_cookie_t cookie = spl_fstrans_mark();

	ASSERT(!MUTEX_HELD(&msp->ms_group->mg_lock));

	mutex_enter(&msp->ms_lock);
	(void) metaslab_load(msp);
	metaslab_set_selected_txg(msp, spa_syncing_txg(spa));
	mutex_exit(&msp->ms_lock);
	spl_fstrans_unmark(cookie);
	}

	static void
	metaslab_group_preload(metaslab_group_t *mg)
	{
	spa_t *spa = mg->mg_vd->vdev_spa;
	metaslab_t *msp;
	avl_tree_t *t = &mg->mg_metaslab_tree;
	int m = 0;

	if (spa_shutting_down(spa) \|\| !metaslab_preload_enabled) {
	taskq_wait_outstanding(mg->mg_taskq, 0);
	return;
	}

	mutex_enter(&mg->mg_lock);

	/*
	* Load the next potential metaslabs
	*/
	for (msp = avl_first(t); msp != NULL; msp = AVL_NEXT(t, msp)) {
	ASSERT3P(msp->ms_group, ==, mg);

	/*
	* We preload only the maximum number of metaslabs specified
	* by metaslab_preload_limit. If a metaslab is being forced
	* to condense then we preload it too. This will ensure
	* that force condensing happens in the next txg.
	*/
	if (++m > metaslab_preload_limit && !msp->ms_condense_wanted) {
	continue;
	}

	VERIFY(taskq_dispatch(mg->mg_taskq, metaslab_preload,
	msp, TQ_SLEEP) != TASKQID_INVALID);
	}
	mutex_exit(&mg->mg_lock);
	}

	/*
	* Determine if the space map's on-disk footprint is past our tolerance for
	* inefficiency. We would like to use the following criteria to make our
	* decision:
	*
	* 1. Do not condense if the size of the space map object would dramatically
	* increase as a result of writing out the free space range tree.
	*
	* 2. Condense if the on on-disk space map representation is at least
	* zfs_condense_pct/100 times the size of the optimal representation
	* (i.e. zfs_condense_pct = 110 and in-core = 1MB, optimal = 1.1MB).
	*
	* 3. Do not condense if the on-disk size of the space map does not actually
	* decrease.
	*
	* Unfortunately, we cannot compute the on-disk size of the space map in this
	* context because we cannot accurately compute the effects of compression, etc.
	* Instead, we apply the heuristic described in the block comment for
	* zfs_metaslab_condense_block_threshold - we only condense if the space used
	* is greater than a threshold number of blocks.
	*/
	static boolean_t
	metaslab_should_condense(metaslab_t *msp)
	{
	space_map_t *sm = msp->ms_sm;
	vdev_t *vd = msp->ms_group->mg_vd;
	uint64_t vdev_blocksize = 1 << vd->vdev_ashift;

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	ASSERT(msp->ms_loaded);
	ASSERT(sm != NULL);
	ASSERT3U(spa_sync_pass(vd->vdev_spa), ==, 1);

	/*
	* We always condense metaslabs that are empty and metaslabs for
	* which a condense request has been made.
	*/
	if (range_tree_numsegs(msp->ms_allocatable) == 0 \|\|
	msp->ms_condense_wanted)
	return (B_TRUE);

	uint64_t record_size = MAX(sm->sm_blksz, vdev_blocksize);
	uint64_t object_size = space_map_length(sm);
	uint64_t optimal_size = space_map_estimate_optimal_size(sm,
	msp->ms_allocatable, SM_NO_VDEVID);

	return (object_size >= (optimal_size * zfs_condense_pct / 100) &&
	object_size > zfs_metaslab_condense_block_threshold * record_size);
	}

	/*
	* Condense the on-disk space map representation to its minimized form.
	* The minimized form consists of a small number of allocations followed
	* by the entries of the free range tree (ms_allocatable). The condensed
	* spacemap contains all the entries of previous TXGs (including those in
	* the pool-wide log spacemaps; thus this is effectively a superset of
	* metaslab_flush()), but this TXG's entries still need to be written.
	*/
	static void
	metaslab_condense(metaslab_t msp, dmu_tx_t tx)
	{
	range_tree_t *condense_tree;
	space_map_t *sm = msp->ms_sm;
	uint64_t txg = dmu_tx_get_txg(tx);
	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	ASSERT(msp->ms_loaded);
	ASSERT(msp->ms_sm != NULL);

	/*
	* In order to condense the space map, we need to change it so it
	* only describes which segments are currently allocated and free.
	*
	* All the current free space resides in the ms_allocatable, all
	* the ms_defer trees, and all the ms_allocating trees. We ignore
	* ms_freed because it is empty because we're in sync pass 1. We
	* ignore ms_freeing because these changes are not yet reflected
	* in the spacemap (they will be written later this txg).
	*
	* So to truncate the space map to represent all the entries of
	* previous TXGs we do the following:
	*
	* 1] We create a range tree (condense tree) that is 100% empty.
	* 2] We add to it all segments found in the ms_defer trees
	* as those segments are marked as free in the original space
	* map. We do the same with the ms_allocating trees for the same
	* reason. Adding these segments should be a relatively
	* inexpensive operation since we expect these trees to have a
	* small number of nodes.
	* 3] We vacate any unflushed allocs, since they are not frees we
	* need to add to the condense tree. Then we vacate any
	* unflushed frees as they should already be part of ms_allocatable.
	* 4] At this point, we would ideally like to add all segments
	* in the ms_allocatable tree from the condense tree. This way
	* we would write all the entries of the condense tree as the
	* condensed space map, which would only contain freed
	* segments with everything else assumed to be allocated.
	*
	* Doing so can be prohibitively expensive as ms_allocatable can
	* be large, and therefore computationally expensive to add to
	* the condense_tree. Instead we first sync out an entry marking
	* everything as allocated, then the condense_tree and then the
	* ms_allocatable, in the condensed space map. While this is not
	* optimal, it is typically close to optimal and more importantly
	* much cheaper to compute.
	*
	* 5] Finally, as both of the unflushed trees were written to our
	* new and condensed metaslab space map, we basically flushed
	* all the unflushed changes to disk, thus we call
	* metaslab_flush_update().
	*/
	ASSERT3U(spa_sync_pass(spa), ==, 1);
	ASSERT(range_tree_is_empty(msp->ms_freed)); /* since it is pass 1 */

	zfs_dbgmsg("condensing: txg %llu, msp[%llu] %px, vdev id %llu, "
	"spa %s, smp size %llu, segments %llu, forcing condense=%s",
	(u_longlong_t)txg, (u_longlong_t)msp->ms_id, msp,
	(u_longlong_t)msp->ms_group->mg_vd->vdev_id,
	spa->spa_name, (u_longlong_t)space_map_length(msp->ms_sm),
	(u_longlong_t)range_tree_numsegs(msp->ms_allocatable),
	msp->ms_condense_wanted ? "TRUE" : "FALSE");

	msp->ms_condense_wanted = B_FALSE;

	range_seg_type_t type;
	uint64_t shift, start;
	type = metaslab_calculate_range_tree_type(msp->ms_group->mg_vd, msp,
	&start, &shift);

	condense_tree = range_tree_create(NULL, type, NULL, start, shift);

	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	range_tree_walk(msp->ms_defer[t],
	range_tree_add, condense_tree);
	}

	for (int t = 0; t < TXG_CONCURRENT_STATES; t++) {
	range_tree_walk(msp->ms_allocating[(txg + t) & TXG_MASK],
	range_tree_add, condense_tree);
	}

	ASSERT3U(spa->spa_unflushed_stats.sus_memused, >=,
	metaslab_unflushed_changes_memused(msp));
	spa->spa_unflushed_stats.sus_memused -=
	metaslab_unflushed_changes_memused(msp);
	range_tree_vacate(msp->ms_unflushed_allocs, NULL, NULL);
	range_tree_vacate(msp->ms_unflushed_frees, NULL, NULL);

	/*
	* We're about to drop the metaslab's lock thus allowing other
	* consumers to change it's content. Set the metaslab's ms_condensing
	* flag to ensure that allocations on this metaslab do not occur
	* while we're in the middle of committing it to disk. This is only
	* critical for ms_allocatable as all other range trees use per TXG
	* views of their content.
	*/
	msp->ms_condensing = B_TRUE;

	mutex_exit(&msp->ms_lock);
	uint64_t object = space_map_object(msp->ms_sm);
	space_map_truncate(sm,
	spa_feature_is_enabled(spa, SPA_FEATURE_LOG_SPACEMAP) ?
	zfs_metaslab_sm_blksz_with_log : zfs_metaslab_sm_blksz_no_log, tx);

	/*
	* space_map_truncate() may have reallocated the spacemap object.
	* If so, update the vdev_ms_array.
	*/
	if (space_map_object(msp->ms_sm) != object) {
	object = space_map_object(msp->ms_sm);
	dmu_write(spa->spa_meta_objset,
	msp->ms_group->mg_vd->vdev_ms_array, sizeof (uint64_t) *
	msp->ms_id, sizeof (uint64_t), &object, tx);
	}

	/*
	* Note:
	* When the log space map feature is enabled, each space map will
	* always have ALLOCS followed by FREES for each sync pass. This is
	* typically true even when the log space map feature is disabled,
	* except from the case where a metaslab goes through metaslab_sync()
	* and gets condensed. In that case the metaslab's space map will have
	* ALLOCS followed by FREES (due to condensing) followed by ALLOCS
	* followed by FREES (due to space_map_write() in metaslab_sync()) for
	* sync pass 1.
	*/
	range_tree_t *tmp_tree = range_tree_create(NULL, type, NULL, start,
	shift);
	range_tree_add(tmp_tree, msp->ms_start, msp->ms_size);
	space_map_write(sm, tmp_tree, SM_ALLOC, SM_NO_VDEVID, tx);
	space_map_write(sm, msp->ms_allocatable, SM_FREE, SM_NO_VDEVID, tx);
	space_map_write(sm, condense_tree, SM_FREE, SM_NO_VDEVID, tx);

	range_tree_vacate(condense_tree, NULL, NULL);
	range_tree_destroy(condense_tree);
	range_tree_vacate(tmp_tree, NULL, NULL);
	range_tree_destroy(tmp_tree);
	mutex_enter(&msp->ms_lock);

	msp->ms_condensing = B_FALSE;
	metaslab_flush_update(msp, tx);
	}

	/*
	* Called when the metaslab has been flushed (its own spacemap now reflects
	* all the contents of the pool-wide spacemap log). Updates the metaslab's
	* metadata and any pool-wide related log space map data (e.g. summary,
	* obsolete logs, etc..) to reflect that.
	*/
	static void
	metaslab_flush_update(metaslab_t msp, dmu_tx_t tx)
	{
	metaslab_group_t *mg = msp->ms_group;
	spa_t *spa = mg->mg_vd->vdev_spa;

	ASSERT(MUTEX_HELD(&msp->ms_lock));

	ASSERT3U(spa_sync_pass(spa), ==, 1);
	ASSERT(range_tree_is_empty(msp->ms_unflushed_allocs));
	ASSERT(range_tree_is_empty(msp->ms_unflushed_frees));

	/*
	* Just because a metaslab got flushed, that doesn't mean that
	* it will pass through metaslab_sync_done(). Thus, make sure to
	* update ms_synced_length here in case it doesn't.
	*/
	msp->ms_synced_length = space_map_length(msp->ms_sm);

	/*
	* We may end up here from metaslab_condense() without the
	* feature being active. In that case this is a no-op.
	*/
	if (!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))
	return;

	ASSERT(spa_syncing_log_sm(spa) != NULL);
	ASSERT(msp->ms_sm != NULL);
	ASSERT(metaslab_unflushed_txg(msp) != 0);
	ASSERT3P(avl_find(&spa->spa_metaslabs_by_flushed, msp, NULL), ==, msp);

	VERIFY3U(tx->tx_txg, <=, spa_final_dirty_txg(spa));

	/* update metaslab's position in our flushing tree */
	uint64_t ms_prev_flushed_txg = metaslab_unflushed_txg(msp);
	mutex_enter(&spa->spa_flushed_ms_lock);
	avl_remove(&spa->spa_metaslabs_by_flushed, msp);
	metaslab_set_unflushed_txg(msp, spa_syncing_txg(spa), tx);
	avl_add(&spa->spa_metaslabs_by_flushed, msp);
	mutex_exit(&spa->spa_flushed_ms_lock);

	/* update metaslab counts of spa_log_sm_t nodes */
	spa_log_sm_decrement_mscount(spa, ms_prev_flushed_txg);
	spa_log_sm_increment_current_mscount(spa);

	/* cleanup obsolete logs if any */
	uint64_t log_blocks_before = spa_log_sm_nblocks(spa);
	spa_cleanup_old_sm_logs(spa, tx);
	uint64_t log_blocks_after = spa_log_sm_nblocks(spa);
	VERIFY3U(log_blocks_after, <=, log_blocks_before);

	/* update log space map summary */
	uint64_t blocks_gone = log_blocks_before - log_blocks_after;
	spa_log_summary_add_flushed_metaslab(spa);
	spa_log_summary_decrement_mscount(spa, ms_prev_flushed_txg);
	spa_log_summary_decrement_blkcount(spa, blocks_gone);
	}

	boolean_t
	metaslab_flush(metaslab_t msp, dmu_tx_t tx)
	{
	spa_t *spa = msp->ms_group->mg_vd->vdev_spa;

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	ASSERT3U(spa_sync_pass(spa), ==, 1);
	ASSERT(spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP));

	ASSERT(msp->ms_sm != NULL);
	ASSERT(metaslab_unflushed_txg(msp) != 0);
	ASSERT(avl_find(&spa->spa_metaslabs_by_flushed, msp, NULL) != NULL);

	/*
	* There is nothing wrong with flushing the same metaslab twice, as
	* this codepath should work on that case. However, the current
	* flushing scheme makes sure to avoid this situation as we would be
	* making all these calls without having anything meaningful to write
	* to disk. We assert this behavior here.
	*/
	ASSERT3U(metaslab_unflushed_txg(msp), <, dmu_tx_get_txg(tx));

	/*
	* We can not flush while loading, because then we would
	* not load the ms_unflushed_{allocs,frees}.
	*/
	if (msp->ms_loading)
	return (B_FALSE);

	metaslab_verify_space(msp, dmu_tx_get_txg(tx));
	metaslab_verify_weight_and_frag(msp);

	/*
	* Metaslab condensing is effectively flushing. Therefore if the
	* metaslab can be condensed we can just condense it instead of
	* flushing it.
	*
	* Note that metaslab_condense() does call metaslab_flush_update()
	* so we can just return immediately after condensing. We also
	* don't need to care about setting ms_flushing or broadcasting
	* ms_flush_cv, even if we temporarily drop the ms_lock in
	* metaslab_condense(), as the metaslab is already loaded.
	*/
	if (msp->ms_loaded && metaslab_should_condense(msp)) {
	metaslab_group_t *mg = msp->ms_group;

	/*
	* For all histogram operations below refer to the
	* comments of metaslab_sync() where we follow a
	* similar procedure.
	*/
	metaslab_group_histogram_verify(mg);
	metaslab_class_histogram_verify(mg->mg_class);
	metaslab_group_histogram_remove(mg, msp);

	metaslab_condense(msp, tx);

	space_map_histogram_clear(msp->ms_sm);
	space_map_histogram_add(msp->ms_sm, msp->ms_allocatable, tx);
	ASSERT(range_tree_is_empty(msp->ms_freed));
	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	space_map_histogram_add(msp->ms_sm,
	msp->ms_defer[t], tx);
	}
	metaslab_aux_histograms_update(msp);

	metaslab_group_histogram_add(mg, msp);
	metaslab_group_histogram_verify(mg);
	metaslab_class_histogram_verify(mg->mg_class);

	metaslab_verify_space(msp, dmu_tx_get_txg(tx));

	/*
	* Since we recreated the histogram (and potentially
	* the ms_sm too while condensing) ensure that the
	* weight is updated too because we are not guaranteed
	* that this metaslab is dirty and will go through
	* metaslab_sync_done().
	*/
	metaslab_recalculate_weight_and_sort(msp);
	return (B_TRUE);
	}

	msp->ms_flushing = B_TRUE;
	uint64_t sm_len_before = space_map_length(msp->ms_sm);

	mutex_exit(&msp->ms_lock);
	space_map_write(msp->ms_sm, msp->ms_unflushed_allocs, SM_ALLOC,
	SM_NO_VDEVID, tx);
	space_map_write(msp->ms_sm, msp->ms_unflushed_frees, SM_FREE,
	SM_NO_VDEVID, tx);
	mutex_enter(&msp->ms_lock);

	uint64_t sm_len_after = space_map_length(msp->ms_sm);
	if (zfs_flags & ZFS_DEBUG_LOG_SPACEMAP) {
	zfs_dbgmsg("flushing: txg %llu, spa %s, vdev_id %llu, "
	"ms_id %llu, unflushed_allocs %llu, unflushed_frees %llu, "
	"appended %llu bytes", (u_longlong_t)dmu_tx_get_txg(tx),
	spa_name(spa),
	(u_longlong_t)msp->ms_group->mg_vd->vdev_id,
	(u_longlong_t)msp->ms_id,
	(u_longlong_t)range_tree_space(msp->ms_unflushed_allocs),
	(u_longlong_t)range_tree_space(msp->ms_unflushed_frees),
	(u_longlong_t)(sm_len_after - sm_len_before));
	}

	ASSERT3U(spa->spa_unflushed_stats.sus_memused, >=,
	metaslab_unflushed_changes_memused(msp));
	spa->spa_unflushed_stats.sus_memused -=
	metaslab_unflushed_changes_memused(msp);
	range_tree_vacate(msp->ms_unflushed_allocs, NULL, NULL);
	range_tree_vacate(msp->ms_unflushed_frees, NULL, NULL);

	metaslab_verify_space(msp, dmu_tx_get_txg(tx));
	metaslab_verify_weight_and_frag(msp);

	metaslab_flush_update(msp, tx);

	metaslab_verify_space(msp, dmu_tx_get_txg(tx));
	metaslab_verify_weight_and_frag(msp);

	msp->ms_flushing = B_FALSE;
	cv_broadcast(&msp->ms_flush_cv);
	return (B_TRUE);
	}

	/*
	* Write a metaslab to disk in the context of the specified transaction group.
	*/
	void
	metaslab_sync(metaslab_t *msp, uint64_t txg)
	{
	metaslab_group_t *mg = msp->ms_group;
	vdev_t *vd = mg->mg_vd;
	spa_t *spa = vd->vdev_spa;
	objset_t *mos = spa_meta_objset(spa);
	range_tree_t *alloctree = msp->ms_allocating[txg & TXG_MASK];
	dmu_tx_t *tx;

	ASSERT(!vd->vdev_ishole);

	/*
	* This metaslab has just been added so there's no work to do now.
	*/
	if (msp->ms_new) {
	ASSERT0(range_tree_space(alloctree));
	ASSERT0(range_tree_space(msp->ms_freeing));
	ASSERT0(range_tree_space(msp->ms_freed));
	ASSERT0(range_tree_space(msp->ms_checkpointing));
	ASSERT0(range_tree_space(msp->ms_trim));
	return;
	}

	/*
	* Normally, we don't want to process a metaslab if there are no
	* allocations or frees to perform. However, if the metaslab is being
	* forced to condense, it's loaded and we're not beyond the final
	* dirty txg, we need to let it through. Not condensing beyond the
	* final dirty txg prevents an issue where metaslabs that need to be
	* condensed but were loaded for other reasons could cause a panic
	* here. By only checking the txg in that branch of the conditional,
	* we preserve the utility of the VERIFY statements in all other
	* cases.
	*/
	if (range_tree_is_empty(alloctree) &&
	range_tree_is_empty(msp->ms_freeing) &&
	range_tree_is_empty(msp->ms_checkpointing) &&
	!(msp->ms_loaded && msp->ms_condense_wanted &&
	txg <= spa_final_dirty_txg(spa)))
	return;


	VERIFY3U(txg, <=, spa_final_dirty_txg(spa));

	/*
	* The only state that can actually be changing concurrently
	* with metaslab_sync() is the metaslab's ms_allocatable. No
	* other thread can be modifying this txg's alloc, freeing,
	* freed, or space_map_phys_t. We drop ms_lock whenever we
	* could call into the DMU, because the DMU can call down to
	* us (e.g. via zio_free()) at any time.
	*
	* The spa_vdev_remove_thread() can be reading metaslab state
	* concurrently, and it is locked out by the ms_sync_lock.
	* Note that the ms_lock is insufficient for this, because it
	* is dropped by space_map_write().
	*/
	tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg);

	/*
	* Generate a log space map if one doesn't exist already.
	*/
	spa_generate_syncing_log_sm(spa, tx);

	if (msp->ms_sm == NULL) {
	uint64_t new_object = space_map_alloc(mos,
	spa_feature_is_enabled(spa, SPA_FEATURE_LOG_SPACEMAP) ?
	zfs_metaslab_sm_blksz_with_log :
	zfs_metaslab_sm_blksz_no_log, tx);
	VERIFY3U(new_object, !=, 0);

	dmu_write(mos, vd->vdev_ms_array, sizeof (uint64_t) *
	msp->ms_id, sizeof (uint64_t), &new_object, tx);

	VERIFY0(space_map_open(&msp->ms_sm, mos, new_object,
	msp->ms_start, msp->ms_size, vd->vdev_ashift));
	ASSERT(msp->ms_sm != NULL);

	ASSERT(range_tree_is_empty(msp->ms_unflushed_allocs));
	ASSERT(range_tree_is_empty(msp->ms_unflushed_frees));
	ASSERT0(metaslab_allocated_space(msp));
	}

	if (metaslab_unflushed_txg(msp) == 0 &&
	spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP)) {
	ASSERT(spa_syncing_log_sm(spa) != NULL);

	metaslab_set_unflushed_txg(msp, spa_syncing_txg(spa), tx);
	spa_log_sm_increment_current_mscount(spa);
	spa_log_summary_add_flushed_metaslab(spa);

	ASSERT(msp->ms_sm != NULL);
	mutex_enter(&spa->spa_flushed_ms_lock);
	avl_add(&spa->spa_metaslabs_by_flushed, msp);
	mutex_exit(&spa->spa_flushed_ms_lock);

	ASSERT(range_tree_is_empty(msp->ms_unflushed_allocs));
	ASSERT(range_tree_is_empty(msp->ms_unflushed_frees));
	}

	if (!range_tree_is_empty(msp->ms_checkpointing) &&
	vd->vdev_checkpoint_sm == NULL) {
	ASSERT(spa_has_checkpoint(spa));

	uint64_t new_object = space_map_alloc(mos,
	zfs_vdev_standard_sm_blksz, tx);
	VERIFY3U(new_object, !=, 0);

	VERIFY0(space_map_open(&vd->vdev_checkpoint_sm,
	mos, new_object, 0, vd->vdev_asize, vd->vdev_ashift));
	ASSERT3P(vd->vdev_checkpoint_sm, !=, NULL);

	/*
	* We save the space map object as an entry in vdev_top_zap
	* so it can be retrieved when the pool is reopened after an
	* export or through zdb.
	*/
	VERIFY0(zap_add(vd->vdev_spa->spa_meta_objset,
	vd->vdev_top_zap, VDEV_TOP_ZAP_POOL_CHECKPOINT_SM,
	sizeof (new_object), 1, &new_object, tx));
	}

	mutex_enter(&msp->ms_sync_lock);
	mutex_enter(&msp->ms_lock);

	/*
	* Note: metaslab_condense() clears the space map's histogram.
	* Therefore we must verify and remove this histogram before
	* condensing.
	*/
	metaslab_group_histogram_verify(mg);
	metaslab_class_histogram_verify(mg->mg_class);
	metaslab_group_histogram_remove(mg, msp);

	if (spa->spa_sync_pass == 1 && msp->ms_loaded &&
	metaslab_should_condense(msp))
	metaslab_condense(msp, tx);

	/*
	* We'll be going to disk to sync our space accounting, thus we
	* drop the ms_lock during that time so allocations coming from
	* open-context (ZIL) for future TXGs do not block.
	*/
	mutex_exit(&msp->ms_lock);
	space_map_t *log_sm = spa_syncing_log_sm(spa);
	if (log_sm != NULL) {
	ASSERT(spa_feature_is_enabled(spa, SPA_FEATURE_LOG_SPACEMAP));

	space_map_write(log_sm, alloctree, SM_ALLOC,
	vd->vdev_id, tx);
	space_map_write(log_sm, msp->ms_freeing, SM_FREE,
	vd->vdev_id, tx);
	mutex_enter(&msp->ms_lock);

	ASSERT3U(spa->spa_unflushed_stats.sus_memused, >=,
	metaslab_unflushed_changes_memused(msp));
	spa->spa_unflushed_stats.sus_memused -=
	metaslab_unflushed_changes_memused(msp);
	range_tree_remove_xor_add(alloctree,
	msp->ms_unflushed_frees, msp->ms_unflushed_allocs);
	range_tree_remove_xor_add(msp->ms_freeing,
	msp->ms_unflushed_allocs, msp->ms_unflushed_frees);
	spa->spa_unflushed_stats.sus_memused +=
	metaslab_unflushed_changes_memused(msp);
	} else {
	ASSERT(!spa_feature_is_enabled(spa, SPA_FEATURE_LOG_SPACEMAP));

	space_map_write(msp->ms_sm, alloctree, SM_ALLOC,
	SM_NO_VDEVID, tx);
	space_map_write(msp->ms_sm, msp->ms_freeing, SM_FREE,
	SM_NO_VDEVID, tx);
	mutex_enter(&msp->ms_lock);
	}

	msp->ms_allocated_space += range_tree_space(alloctree);
	ASSERT3U(msp->ms_allocated_space, >=,
	range_tree_space(msp->ms_freeing));
	msp->ms_allocated_space -= range_tree_space(msp->ms_freeing);

	if (!range_tree_is_empty(msp->ms_checkpointing)) {
	ASSERT(spa_has_checkpoint(spa));
	ASSERT3P(vd->vdev_checkpoint_sm, !=, NULL);

	/*
	* Since we are doing writes to disk and the ms_checkpointing
	* tree won't be changing during that time, we drop the
	* ms_lock while writing to the checkpoint space map, for the
	* same reason mentioned above.
	*/
	mutex_exit(&msp->ms_lock);
	space_map_write(vd->vdev_checkpoint_sm,
	msp->ms_checkpointing, SM_FREE, SM_NO_VDEVID, tx);
	mutex_enter(&msp->ms_lock);

	spa->spa_checkpoint_info.sci_dspace +=
	range_tree_space(msp->ms_checkpointing);
	vd->vdev_stat.vs_checkpoint_space +=
	range_tree_space(msp->ms_checkpointing);
	ASSERT3U(vd->vdev_stat.vs_checkpoint_space, ==,
	-space_map_allocated(vd->vdev_checkpoint_sm));

	range_tree_vacate(msp->ms_checkpointing, NULL, NULL);
	}

	if (msp->ms_loaded) {
	/*
	* When the space map is loaded, we have an accurate
	* histogram in the range tree. This gives us an opportunity
	* to bring the space map's histogram up-to-date so we clear
	* it first before updating it.
	*/
	space_map_histogram_clear(msp->ms_sm);
	space_map_histogram_add(msp->ms_sm, msp->ms_allocatable, tx);

	/*
	* Since we've cleared the histogram we need to add back
	* any free space that has already been processed, plus
	* any deferred space. This allows the on-disk histogram
	* to accurately reflect all free space even if some space
	* is not yet available for allocation (i.e. deferred).
	*/
	space_map_histogram_add(msp->ms_sm, msp->ms_freed, tx);

	/*
	* Add back any deferred free space that has not been
	* added back into the in-core free tree yet. This will
	* ensure that we don't end up with a space map histogram
	* that is completely empty unless the metaslab is fully
	* allocated.
	*/
	for (int t = 0; t < TXG_DEFER_SIZE; t++) {
	space_map_histogram_add(msp->ms_sm,
	msp->ms_defer[t], tx);
	}
	}

	/*
	* Always add the free space from this sync pass to the space
	* map histogram. We want to make sure that the on-disk histogram
	* accounts for all free space. If the space map is not loaded,
	* then we will lose some accuracy but will correct it the next
	* time we load the space map.
	*/
	space_map_histogram_add(msp->ms_sm, msp->ms_freeing, tx);
	metaslab_aux_histograms_update(msp);

	metaslab_group_histogram_add(mg, msp);
	metaslab_group_histogram_verify(mg);
	metaslab_class_histogram_verify(mg->mg_class);

	/*
	* For sync pass 1, we avoid traversing this txg's free range tree
	* and instead will just swap the pointers for freeing and freed.
	* We can safely do this since the freed_tree is guaranteed to be
	* empty on the initial pass.
	*
	* Keep in mind that even if we are currently using a log spacemap
	* we want current frees to end up in the ms_allocatable (but not
	* get appended to the ms_sm) so their ranges can be reused as usual.
	*/
	if (spa_sync_pass(spa) == 1) {
	range_tree_swap(&msp->ms_freeing, &msp->ms_freed);
	ASSERT0(msp->ms_allocated_this_txg);
	} else {
	range_tree_vacate(msp->ms_freeing,
	range_tree_add, msp->ms_freed);
	}
	msp->ms_allocated_this_txg += range_tree_space(alloctree);
	range_tree_vacate(alloctree, NULL, NULL);

	ASSERT0(range_tree_space(msp->ms_allocating[txg & TXG_MASK]));
	ASSERT0(range_tree_space(msp->ms_allocating[TXG_CLEAN(txg)
	& TXG_MASK]));
	ASSERT0(range_tree_space(msp->ms_freeing));
	ASSERT0(range_tree_space(msp->ms_checkpointing));

	mutex_exit(&msp->ms_lock);

	/*
	* Verify that the space map object ID has been recorded in the
	* vdev_ms_array.
	*/
	uint64_t object;
	VERIFY0(dmu_read(mos, vd->vdev_ms_array,
	msp->ms_id * sizeof (uint64_t), sizeof (uint64_t), &object, 0));
	VERIFY3U(object, ==, space_map_object(msp->ms_sm));

	mutex_exit(&msp->ms_sync_lock);
	dmu_tx_commit(tx);
	}

	static void
	metaslab_evict(metaslab_t *msp, uint64_t txg)
	{
	if (!msp->ms_loaded \|\| msp->ms_disabled != 0)
	return;

	for (int t = 1; t < TXG_CONCURRENT_STATES; t++) {
	VERIFY0(range_tree_space(
	msp->ms_allocating[(txg + t) & TXG_MASK]));
	}
	if (msp->ms_allocator != -1)
	metaslab_passivate(msp, msp->ms_weight & ~METASLAB_ACTIVE_MASK);

	if (!metaslab_debug_unload)
	metaslab_unload(msp);
	}

	/*
	* Called after a transaction group has completely synced to mark
	* all of the metaslab's free space as usable.
	*/
	void
	metaslab_sync_done(metaslab_t *msp, uint64_t txg)
	{
	metaslab_group_t *mg = msp->ms_group;
	vdev_t *vd = mg->mg_vd;
	spa_t *spa = vd->vdev_spa;
	range_tree_t **defer_tree;
	int64_t alloc_delta, defer_delta;
	boolean_t defer_allowed = B_TRUE;

	ASSERT(!vd->vdev_ishole);

	mutex_enter(&msp->ms_lock);

	if (msp->ms_new) {
	/* this is a new metaslab, add its capacity to the vdev */
	metaslab_space_update(vd, mg->mg_class, 0, 0, msp->ms_size);

	/* there should be no allocations nor frees at this point */
	VERIFY0(msp->ms_allocated_this_txg);
	VERIFY0(range_tree_space(msp->ms_freed));
	}

	ASSERT0(range_tree_space(msp->ms_freeing));
	ASSERT0(range_tree_space(msp->ms_checkpointing));

	defer_tree = &msp->ms_defer[txg % TXG_DEFER_SIZE];

	uint64_t free_space = metaslab_class_get_space(spa_normal_class(spa)) -
	metaslab_class_get_alloc(spa_normal_class(spa));
	if (free_space <= spa_get_slop_space(spa) \|\| vd->vdev_removing) {
	defer_allowed = B_FALSE;
	}

	defer_delta = 0;
	alloc_delta = msp->ms_allocated_this_txg -
	range_tree_space(msp->ms_freed);

	if (defer_allowed) {
	defer_delta = range_tree_space(msp->ms_freed) -
	range_tree_space(*defer_tree);
	} else {
	defer_delta -= range_tree_space(*defer_tree);
	}
	metaslab_space_update(vd, mg->mg_class, alloc_delta + defer_delta,
	defer_delta, 0);

	if (spa_syncing_log_sm(spa) == NULL) {
	/*
	* If there's a metaslab_load() in progress and we don't have
	* a log space map, it means that we probably wrote to the
	* metaslab's space map. If this is the case, we need to
	* make sure that we wait for the load to complete so that we
	* have a consistent view at the in-core side of the metaslab.
	*/
	metaslab_load_wait(msp);
	} else {
	ASSERT(spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP));
	}

	/*
	* When auto-trimming is enabled, free ranges which are added to
	* ms_allocatable are also be added to ms_trim. The ms_trim tree is
	* periodically consumed by the vdev_autotrim_thread() which issues
	* trims for all ranges and then vacates the tree. The ms_trim tree
	* can be discarded at any time with the sole consequence of recent
	* frees not being trimmed.
	*/
	if (spa_get_autotrim(spa) == SPA_AUTOTRIM_ON) {
	range_tree_walk(*defer_tree, range_tree_add, msp->ms_trim);
	if (!defer_allowed) {
	range_tree_walk(msp->ms_freed, range_tree_add,
	msp->ms_trim);
	}
	} else {
	range_tree_vacate(msp->ms_trim, NULL, NULL);
	}

	/*
	* Move the frees from the defer_tree back to the free
	* range tree (if it's loaded). Swap the freed_tree and
	* the defer_tree -- this is safe to do because we've
	* just emptied out the defer_tree.
	*/
	range_tree_vacate(*defer_tree,
	msp->ms_loaded ? range_tree_add : NULL, msp->ms_allocatable);
	if (defer_allowed) {
	range_tree_swap(&msp->ms_freed, defer_tree);
	} else {
	range_tree_vacate(msp->ms_freed,
	msp->ms_loaded ? range_tree_add : NULL,
	msp->ms_allocatable);
	}

	msp->ms_synced_length = space_map_length(msp->ms_sm);

	msp->ms_deferspace += defer_delta;
	ASSERT3S(msp->ms_deferspace, >=, 0);
	ASSERT3S(msp->ms_deferspace, <=, msp->ms_size);
	if (msp->ms_deferspace != 0) {
	/*
	* Keep syncing this metaslab until all deferred frees
	* are back in circulation.
	*/
	vdev_dirty(vd, VDD_METASLAB, msp, txg + 1);
	}
	metaslab_aux_histograms_update_done(msp, defer_allowed);

	if (msp->ms_new) {
	msp->ms_new = B_FALSE;
	mutex_enter(&mg->mg_lock);
	mg->mg_ms_ready++;
	mutex_exit(&mg->mg_lock);
	}

	/*
	* Re-sort metaslab within its group now that we've adjusted
	* its allocatable space.
	*/
	metaslab_recalculate_weight_and_sort(msp);

	ASSERT0(range_tree_space(msp->ms_allocating[txg & TXG_MASK]));
	ASSERT0(range_tree_space(msp->ms_freeing));
	ASSERT0(range_tree_space(msp->ms_freed));
	ASSERT0(range_tree_space(msp->ms_checkpointing));
	msp->ms_allocating_total -= msp->ms_allocated_this_txg;
	msp->ms_allocated_this_txg = 0;
	mutex_exit(&msp->ms_lock);
	}

	void
	metaslab_sync_reassess(metaslab_group_t *mg)
	{
	spa_t *spa = mg->mg_class->mc_spa;

	spa_config_enter(spa, SCL_ALLOC, FTAG, RW_READER);
	metaslab_group_alloc_update(mg);
	mg->mg_fragmentation = metaslab_group_fragmentation(mg);

	/*
	* Preload the next potential metaslabs but only on active
	* metaslab groups. We can get into a state where the metaslab
	* is no longer active since we dirty metaslabs as we remove a
	* a device, thus potentially making the metaslab group eligible
	* for preloading.
	*/
	if (mg->mg_activation_count > 0) {
	metaslab_group_preload(mg);
	}
	spa_config_exit(spa, SCL_ALLOC, FTAG);
	}

	/*
	* When writing a ditto block (i.e. more than one DVA for a given BP) on
	* the same vdev as an existing DVA of this BP, then try to allocate it
	* on a different metaslab than existing DVAs (i.e. a unique metaslab).
	*/
	static boolean_t
	metaslab_is_unique(metaslab_t msp, dva_t dva)
	{
	uint64_t dva_ms_id;

	if (DVA_GET_ASIZE(dva) == 0)
	return (B_TRUE);

	if (msp->ms_group->mg_vd->vdev_id != DVA_GET_VDEV(dva))
	return (B_TRUE);

	dva_ms_id = DVA_GET_OFFSET(dva) >> msp->ms_group->mg_vd->vdev_ms_shift;

	return (msp->ms_id != dva_ms_id);
	}

	/*
	* ==========================================================================
	* Metaslab allocation tracing facility
	* ==========================================================================
	*/

	/*
	* Add an allocation trace element to the allocation tracing list.
	*/
	static void
	metaslab_trace_add(zio_alloc_list_t zal, metaslab_group_t mg,
	metaslab_t *msp, uint64_t psize, uint32_t dva_id, uint64_t offset,
	int allocator)
	{
	metaslab_alloc_trace_t *mat;

	if (!metaslab_trace_enabled)
	return;

	/*
	* When the tracing list reaches its maximum we remove
	* the second element in the list before adding a new one.
	* By removing the second element we preserve the original
	* entry as a clue to what allocations steps have already been
	* performed.
	*/
	if (zal->zal_size == metaslab_trace_max_entries) {
	metaslab_alloc_trace_t *mat_next;
	#ifdef ZFS_DEBUG
	panic("too many entries in allocation list");
	#endif
	METASLABSTAT_BUMP(metaslabstat_trace_over_limit);
	zal->zal_size--;
	mat_next = list_next(&zal->zal_list, list_head(&zal->zal_list));
	list_remove(&zal->zal_list, mat_next);
	kmem_cache_free(metaslab_alloc_trace_cache, mat_next);
	}

	mat = kmem_cache_alloc(metaslab_alloc_trace_cache, KM_SLEEP);
	list_link_init(&mat->mat_list_node);
	mat->mat_mg = mg;
	mat->mat_msp = msp;
	mat->mat_size = psize;
	mat->mat_dva_id = dva_id;
	mat->mat_offset = offset;
	mat->mat_weight = 0;
	mat->mat_allocator = allocator;

	if (msp != NULL)
	mat->mat_weight = msp->ms_weight;

	/*
	* The list is part of the zio so locking is not required. Only
	* a single thread will perform allocations for a given zio.
	*/
	list_insert_tail(&zal->zal_list, mat);
	zal->zal_size++;

	ASSERT3U(zal->zal_size, <=, metaslab_trace_max_entries);
	}

	void
	metaslab_trace_init(zio_alloc_list_t *zal)
	{
	list_create(&zal->zal_list, sizeof (metaslab_alloc_trace_t),
	offsetof(metaslab_alloc_trace_t, mat_list_node));
	zal->zal_size = 0;
	}

	void
	metaslab_trace_fini(zio_alloc_list_t *zal)
	{
	metaslab_alloc_trace_t *mat;

	while ((mat = list_remove_head(&zal->zal_list)) != NULL)
	kmem_cache_free(metaslab_alloc_trace_cache, mat);
	list_destroy(&zal->zal_list);
	zal->zal_size = 0;
	}

	/*
	* ==========================================================================
	* Metaslab block operations
	* ==========================================================================
	*/

	static void
	metaslab_group_alloc_increment(spa_t spa, uint64_t vdev, void tag, int flags,
	int allocator)
	{
	if (!(flags & METASLAB_ASYNC_ALLOC) \|\|
	(flags & METASLAB_DONT_THROTTLE))
	return;

	metaslab_group_t *mg = vdev_lookup_top(spa, vdev)->vdev_mg;
	if (!mg->mg_class->mc_alloc_throttle_enabled)
	return;

	metaslab_group_allocator_t *mga = &mg->mg_allocator[allocator];
	(void) zfs_refcount_add(&mga->mga_alloc_queue_depth, tag);
	}

	static void
	metaslab_group_increment_qdepth(metaslab_group_t *mg, int allocator)
	{
	metaslab_group_allocator_t *mga = &mg->mg_allocator[allocator];
	metaslab_class_allocator_t *mca =
	&mg->mg_class->mc_allocator[allocator];
	uint64_t max = mg->mg_max_alloc_queue_depth;
	uint64_t cur = mga->mga_cur_max_alloc_queue_depth;
	while (cur < max) {
	if (atomic_cas_64(&mga->mga_cur_max_alloc_queue_depth,
	cur, cur + 1) == cur) {
	atomic_inc_64(&mca->mca_alloc_max_slots);
	return;
	}
	cur = mga->mga_cur_max_alloc_queue_depth;
	}
	}

	void
	metaslab_group_alloc_decrement(spa_t spa, uint64_t vdev, void tag, int flags,
	int allocator, boolean_t io_complete)
	{
	if (!(flags & METASLAB_ASYNC_ALLOC) \|\|
	(flags & METASLAB_DONT_THROTTLE))
	return;

	metaslab_group_t *mg = vdev_lookup_top(spa, vdev)->vdev_mg;
	if (!mg->mg_class->mc_alloc_throttle_enabled)
	return;

	metaslab_group_allocator_t *mga = &mg->mg_allocator[allocator];
	(void) zfs_refcount_remove(&mga->mga_alloc_queue_depth, tag);
	if (io_complete)
	metaslab_group_increment_qdepth(mg, allocator);
	}

	void
	metaslab_group_alloc_verify(spa_t spa, const blkptr_t bp, void *tag,
	int allocator)
	{
	#ifdef ZFS_DEBUG
	const dva_t *dva = bp->blk_dva;
	int ndvas = BP_GET_NDVAS(bp);

	for (int d = 0; d < ndvas; d++) {
	uint64_t vdev = DVA_GET_VDEV(&dva[d]);
	metaslab_group_t *mg = vdev_lookup_top(spa, vdev)->vdev_mg;
	metaslab_group_allocator_t *mga = &mg->mg_allocator[allocator];
	VERIFY(zfs_refcount_not_held(&mga->mga_alloc_queue_depth, tag));
	}
	#endif
	}

	static uint64_t
	metaslab_block_alloc(metaslab_t *msp, uint64_t size, uint64_t txg)
	{
	uint64_t start;
	range_tree_t *rt = msp->ms_allocatable;
	metaslab_class_t *mc = msp->ms_group->mg_class;

	ASSERT(MUTEX_HELD(&msp->ms_lock));
	VERIFY(!msp->ms_condensing);
	VERIFY0(msp->ms_disabled);

	start = mc->mc_ops->msop_alloc(msp, size);
	if (start != -1ULL) {
	metaslab_group_t *mg = msp->ms_group;
	vdev_t *vd = mg->mg_vd;

	VERIFY0(P2PHASE(start, 1ULL << vd->vdev_ashift));
	VERIFY0(P2PHASE(size, 1ULL << vd->vdev_ashift));
	VERIFY3U(range_tree_space(rt) - size, <=, msp->ms_size);
	range_tree_remove(rt, start, size);
	range_tree_clear(msp->ms_trim, start, size);

	if (range_tree_is_empty(msp->ms_allocating[txg & TXG_MASK]))
	vdev_dirty(mg->mg_vd, VDD_METASLAB, msp, txg);

	range_tree_add(msp->ms_allocating[txg & TXG_MASK], start, size);
	msp->ms_allocating_total += size;

	/* Track the last successful allocation */
	msp->ms_alloc_txg = txg;
	metaslab_verify_space(msp, txg);
	}

	/*
	* Now that we've attempted the allocation we need to update the
	* metaslab's maximum block size since it may have changed.
	*/
	msp->ms_max_size = metaslab_largest_allocatable(msp);
	return (start);
	}

	/*
	* Find the metaslab with the highest weight that is less than what we've
	* already tried. In the common case, this means that we will examine each
	* metaslab at most once. Note that concurrent callers could reorder metaslabs
	* by activation/passivation once we have dropped the mg_lock. If a metaslab is
	* activated by another thread, and we fail to allocate from the metaslab we
	* have selected, we may not try the newly-activated metaslab, and instead
	* activate another metaslab. This is not optimal, but generally does not cause
	* any problems (a possible exception being if every metaslab is completely full
	* except for the newly-activated metaslab which we fail to examine).
	*/
	static metaslab_t *
	find_valid_metaslab(metaslab_group_t *mg, uint64_t activation_weight,
	dva_t *dva, int d, boolean_t want_unique, uint64_t asize, int allocator,
	boolean_t try_hard, zio_alloc_list_t zal, metaslab_t search,
	boolean_t *was_active)
	{
	avl_index_t idx;
	avl_tree_t *t = &mg->mg_metaslab_tree;
	metaslab_t *msp = avl_find(t, search, &idx);
	if (msp == NULL)
	msp = avl_nearest(t, idx, AVL_AFTER);

	int tries = 0;
	for (; msp != NULL; msp = AVL_NEXT(t, msp)) {
	int i;

	if (!try_hard && tries > zfs_metaslab_find_max_tries) {
	METASLABSTAT_BUMP(metaslabstat_too_many_tries);
	return (NULL);
	}
	tries++;

	if (!metaslab_should_allocate(msp, asize, try_hard)) {
	metaslab_trace_add(zal, mg, msp, asize, d,
	TRACE_TOO_SMALL, allocator);
	continue;
	}

	/*
	* If the selected metaslab is condensing or disabled,
	* skip it.
	*/
	if (msp->ms_condensing \|\| msp->ms_disabled > 0)
	continue;

	*was_active = msp->ms_allocator != -1;
	/*
	* If we're activating as primary, this is our first allocation
	* from this disk, so we don't need to check how close we are.
	* If the metaslab under consideration was already active,
	* we're getting desperate enough to steal another allocator's
	* metaslab, so we still don't care about distances.
	*/
	if (activation_weight == METASLAB_WEIGHT_PRIMARY \|\| *was_active)
	break;

	for (i = 0; i < d; i++) {
	if (want_unique &&
	!metaslab_is_unique(msp, &dva[i]))
	break; /* try another metaslab */
	}
	if (i == d)
	break;
	}

	if (msp != NULL) {
	search->ms_weight = msp->ms_weight;
	search->ms_start = msp->ms_start + 1;
	search->ms_allocator = msp->ms_allocator;
	search->ms_primary = msp->ms_primary;
	}
	return (msp);
	}

	static void
	metaslab_active_mask_verify(metaslab_t *msp)
	{
	ASSERT(MUTEX_HELD(&msp->ms_lock));

	if ((zfs_flags & ZFS_DEBUG_METASLAB_VERIFY) == 0)
	return;

	if ((msp->ms_weight & METASLAB_ACTIVE_MASK) == 0)
	return;

	if (msp->ms_weight & METASLAB_WEIGHT_PRIMARY) {
	VERIFY0(msp->ms_weight & METASLAB_WEIGHT_SECONDARY);
	VERIFY0(msp->ms_weight & METASLAB_WEIGHT_CLAIM);
	VERIFY3S(msp->ms_allocator, !=, -1);
	VERIFY(msp->ms_primary);
	return;
	}

	if (msp->ms_weight & METASLAB_WEIGHT_SECONDARY) {
	VERIFY0(msp->ms_weight & METASLAB_WEIGHT_PRIMARY);
	VERIFY0(msp->ms_weight & METASLAB_WEIGHT_CLAIM);
	VERIFY3S(msp->ms_allocator, !=, -1);
	VERIFY(!msp->ms_primary);
	return;
	}

	if (msp->ms_weight & METASLAB_WEIGHT_CLAIM) {
	VERIFY0(msp->ms_weight & METASLAB_WEIGHT_PRIMARY);
	VERIFY0(msp->ms_weight & METASLAB_WEIGHT_SECONDARY);
	VERIFY3S(msp->ms_allocator, ==, -1);
	return;
	}
	}

	/* ARGSUSED */
	static uint64_t
	metaslab_group_alloc_normal(metaslab_group_t mg, zio_alloc_list_t zal,
	uint64_t asize, uint64_t txg, boolean_t want_unique, dva_t *dva, int d,
	int allocator, boolean_t try_hard)
	{
	metaslab_t *msp = NULL;
	uint64_t offset = -1ULL;

	uint64_t activation_weight = METASLAB_WEIGHT_PRIMARY;
	for (int i = 0; i < d; i++) {
	if (activation_weight == METASLAB_WEIGHT_PRIMARY &&
	DVA_GET_VDEV(&dva[i]) == mg->mg_vd->vdev_id) {
	activation_weight = METASLAB_WEIGHT_SECONDARY;
	} else if (activation_weight == METASLAB_WEIGHT_SECONDARY &&
	DVA_GET_VDEV(&dva[i]) == mg->mg_vd->vdev_id) {
	activation_weight = METASLAB_WEIGHT_CLAIM;
	break;
	}
	}

	/*
	* If we don't have enough metaslabs active to fill the entire array, we
	* just use the 0th slot.
	*/
	if (mg->mg_ms_ready < mg->mg_allocators * 3)
	allocator = 0;
	metaslab_group_allocator_t *mga = &mg->mg_allocator[allocator];

	ASSERT3U(mg->mg_vd->vdev_ms_count, >=, 2);

	metaslab_t search = kmem_alloc(sizeof (search), KM_SLEEP);
	search->ms_weight = UINT64_MAX;
	search->ms_start = 0;
	/*
	* At the end of the metaslab tree are the already-active metaslabs,
	* first the primaries, then the secondaries. When we resume searching
	* through the tree, we need to consider ms_allocator and ms_primary so
	* we start in the location right after where we left off, and don't
	* accidentally loop forever considering the same metaslabs.
	*/
	search->ms_allocator = -1;
	search->ms_primary = B_TRUE;
	for (;;) {
	boolean_t was_active = B_FALSE;

	mutex_enter(&mg->mg_lock);

	if (activation_weight == METASLAB_WEIGHT_PRIMARY &&
	mga->mga_primary != NULL) {
	msp = mga->mga_primary;

	/*
	* Even though we don't hold the ms_lock for the
	* primary metaslab, those fields should not
	* change while we hold the mg_lock. Thus it is
	* safe to make assertions on them.
	*/
	ASSERT(msp->ms_primary);
	ASSERT3S(msp->ms_allocator, ==, allocator);
	ASSERT(msp->ms_loaded);

	was_active = B_TRUE;
	ASSERT(msp->ms_weight & METASLAB_ACTIVE_MASK);
	} else if (activation_weight == METASLAB_WEIGHT_SECONDARY &&
	mga->mga_secondary != NULL) {
	msp = mga->mga_secondary;

	/*
	* See comment above about the similar assertions
	* for the primary metaslab.
	*/
	ASSERT(!msp->ms_primary);
	ASSERT3S(msp->ms_allocator, ==, allocator);
	ASSERT(msp->ms_loaded);

	was_active = B_TRUE;
	ASSERT(msp->ms_weight & METASLAB_ACTIVE_MASK);
	} else {
	msp = find_valid_metaslab(mg, activation_weight, dva, d,
	want_unique, asize, allocator, try_hard, zal,
	search, &was_active);
	}

	mutex_exit(&mg->mg_lock);
	if (msp == NULL) {
	kmem_free(search, sizeof (*search));
	return (-1ULL);
	}
	mutex_enter(&msp->ms_lock);

	metaslab_active_mask_verify(msp);

	/*
	* This code is disabled out because of issues with
	* tracepoints in non-gpl kernel modules.
	*/
	#if 0
	DTRACE_PROBE3(ms__activation__attempt,
	metaslab_t *, msp, uint64_t, activation_weight,
	boolean_t, was_active);
	#endif

	/*
	* Ensure that the metaslab we have selected is still
	* capable of handling our request. It's possible that
	* another thread may have changed the weight while we
	* were blocked on the metaslab lock. We check the
	* active status first to see if we need to set_selected_txg
	* a new metaslab.
	*/
	if (was_active && !(msp->ms_weight & METASLAB_ACTIVE_MASK)) {
	ASSERT3S(msp->ms_allocator, ==, -1);
	mutex_exit(&msp->ms_lock);
	continue;
	}

	/*
	* If the metaslab was activated for another allocator
	* while we were waiting in the ms_lock above, or it's
	* a primary and we're seeking a secondary (or vice versa),
	* we go back and select a new metaslab.
	*/
	if (!was_active && (msp->ms_weight & METASLAB_ACTIVE_MASK) &&
	(msp->ms_allocator != -1) &&
	(msp->ms_allocator != allocator \|\| ((activation_weight ==
	METASLAB_WEIGHT_PRIMARY) != msp->ms_primary))) {
	ASSERT(msp->ms_loaded);
	ASSERT((msp->ms_weight & METASLAB_WEIGHT_CLAIM) \|\|
	msp->ms_allocator != -1);
	mutex_exit(&msp->ms_lock);
	continue;
	}

	/*
	* This metaslab was used for claiming regions allocated
	* by the ZIL during pool import. Once these regions are
	* claimed we don't need to keep the CLAIM bit set
	* anymore. Passivate this metaslab to zero its activation
	* mask.
	*/
	if (msp->ms_weight & METASLAB_WEIGHT_CLAIM &&
	activation_weight != METASLAB_WEIGHT_CLAIM) {
	ASSERT(msp->ms_loaded);
	ASSERT3S(msp->ms_allocator, ==, -1);
	metaslab_passivate(msp, msp->ms_weight &
	~METASLAB_WEIGHT_CLAIM);
	mutex_exit(&msp->ms_lock);
	continue;
	}

	metaslab_set_selected_txg(msp, txg);

	int activation_error =
	metaslab_activate(msp, allocator, activation_weight);
	metaslab_active_mask_verify(msp);

	/*
	* If the metaslab was activated by another thread for
	* another allocator or activation_weight (EBUSY), or it
	* failed because another metaslab was assigned as primary
	* for this allocator (EEXIST) we continue using this
	* metaslab for our allocation, rather than going on to a
	* worse metaslab (we waited for that metaslab to be loaded
	* after all).
	*
	* If the activation failed due to an I/O error or ENOSPC we
	* skip to the next metaslab.
	*/
	boolean_t activated;
	if (activation_error == 0) {
	activated = B_TRUE;
	} else if (activation_error == EBUSY \|\|
	activation_error == EEXIST) {
	activated = B_FALSE;
	} else {
	mutex_exit(&msp->ms_lock);
	continue;
	}
	ASSERT(msp->ms_loaded);

	/*
	* Now that we have the lock, recheck to see if we should
	* continue to use this metaslab for this allocation. The
	* the metaslab is now loaded so metaslab_should_allocate()
	* can accurately determine if the allocation attempt should
	* proceed.
	*/
	if (!metaslab_should_allocate(msp, asize, try_hard)) {
	/* Passivate this metaslab and select a new one. */
	metaslab_trace_add(zal, mg, msp, asize, d,
	TRACE_TOO_SMALL, allocator);
	goto next;
	}

	/*
	* If this metaslab is currently condensing then pick again
	* as we can't manipulate this metaslab until it's committed
	* to disk. If this metaslab is being initialized, we shouldn't
	* allocate from it since the allocated region might be
	* overwritten after allocation.
	*/
	if (msp->ms_condensing) {
	metaslab_trace_add(zal, mg, msp, asize, d,
	TRACE_CONDENSING, allocator);
	if (activated) {
	metaslab_passivate(msp, msp->ms_weight &
	~METASLAB_ACTIVE_MASK);
	}
	mutex_exit(&msp->ms_lock);
	continue;
	} else if (msp->ms_disabled > 0) {
	metaslab_trace_add(zal, mg, msp, asize, d,
	TRACE_DISABLED, allocator);
	if (activated) {
	metaslab_passivate(msp, msp->ms_weight &
	~METASLAB_ACTIVE_MASK);
	}
	mutex_exit(&msp->ms_lock);
	continue;
	}

	offset = metaslab_block_alloc(msp, asize, txg);
	metaslab_trace_add(zal, mg, msp, asize, d, offset, allocator);

	if (offset != -1ULL) {
	/* Proactively passivate the metaslab, if needed */
	if (activated)
	metaslab_segment_may_passivate(msp);
	break;
	}
	next:
	ASSERT(msp->ms_loaded);

	/*
	* This code is disabled out because of issues with
	* tracepoints in non-gpl kernel modules.
	*/
	#if 0
	DTRACE_PROBE2(ms__alloc__failure, metaslab_t *, msp,
	uint64_t, asize);
	#endif

	/*
	* We were unable to allocate from this metaslab so determine
	* a new weight for this metaslab. Now that we have loaded
	* the metaslab we can provide a better hint to the metaslab
	* selector.
	*
	* For space-based metaslabs, we use the maximum block size.
	* This information is only available when the metaslab
	* is loaded and is more accurate than the generic free
	* space weight that was calculated by metaslab_weight().
	* This information allows us to quickly compare the maximum
	* available allocation in the metaslab to the allocation
	* size being requested.
	*
	* For segment-based metaslabs, determine the new weight
	* based on the highest bucket in the range tree. We
	* explicitly use the loaded segment weight (i.e. the range
	* tree histogram) since it contains the space that is
	* currently available for allocation and is accurate
	* even within a sync pass.
	*/
	uint64_t weight;
	if (WEIGHT_IS_SPACEBASED(msp->ms_weight)) {
	weight = metaslab_largest_allocatable(msp);
	WEIGHT_SET_SPACEBASED(weight);
	} else {
	weight = metaslab_weight_from_range_tree(msp);
	}

	if (activated) {
	metaslab_passivate(msp, weight);
	} else {
	/*
	* For the case where we use the metaslab that is
	* active for another allocator we want to make
	* sure that we retain the activation mask.
	*
	* Note that we could attempt to use something like
	* metaslab_recalculate_weight_and_sort() that
	* retains the activation mask here. That function
	* uses metaslab_weight() to set the weight though
	* which is not as accurate as the calculations
	* above.
	*/
	weight \|= msp->ms_weight & METASLAB_ACTIVE_MASK;
	metaslab_group_sort(mg, msp, weight);
	}
	metaslab_active_mask_verify(msp);

	/*
	* We have just failed an allocation attempt, check
	* that metaslab_should_allocate() agrees. Otherwise,
	* we may end up in an infinite loop retrying the same
	* metaslab.
	*/
	ASSERT(!metaslab_should_allocate(msp, asize, try_hard));

	mutex_exit(&msp->ms_lock);
	}
	mutex_exit(&msp->ms_lock);
	kmem_free(search, sizeof (*search));
	return (offset);
	}

	static uint64_t
	metaslab_group_alloc(metaslab_group_t mg, zio_alloc_list_t zal,
	uint64_t asize, uint64_t txg, boolean_t want_unique, dva_t *dva, int d,
	int allocator, boolean_t try_hard)
	{
	uint64_t offset;
	ASSERT(mg->mg_initialized);

	offset = metaslab_group_alloc_normal(mg, zal, asize, txg, want_unique,
	dva, d, allocator, try_hard);

	mutex_enter(&mg->mg_lock);
	if (offset == -1ULL) {
	mg->mg_failed_allocations++;
	metaslab_trace_add(zal, mg, NULL, asize, d,
	TRACE_GROUP_FAILURE, allocator);
	if (asize == SPA_GANGBLOCKSIZE) {
	/*
	* This metaslab group was unable to allocate
	* the minimum gang block size so it must be out of
	* space. We must notify the allocation throttle
	* to start skipping allocation attempts to this
	* metaslab group until more space becomes available.
	* Note: this failure cannot be caused by the
	* allocation throttle since the allocation throttle
	* is only responsible for skipping devices and
	* not failing block allocations.
	*/
	mg->mg_no_free_space = B_TRUE;
	}
	}
	mg->mg_allocations++;
	mutex_exit(&mg->mg_lock);
	return (offset);
	}

	/*
	* Allocate a block for the specified i/o.
	*/
	int
	metaslab_alloc_dva(spa_t spa, metaslab_class_t mc, uint64_t psize,
	dva_t dva, int d, dva_t hintdva, uint64_t txg, int flags,
	zio_alloc_list_t *zal, int allocator)
	{
	metaslab_class_allocator_t *mca = &mc->mc_allocator[allocator];
	metaslab_group_t mg, fast_mg, *rotor;
	vdev_t *vd;
	boolean_t try_hard = B_FALSE;

	ASSERT(!DVA_IS_VALID(&dva[d]));

	/*
	* For testing, make some blocks above a certain size be gang blocks.
	* This will result in more split blocks when using device removal,
	* and a large number of split blocks coupled with ztest-induced
	* damage can result in extremely long reconstruction times. This
	* will also test spilling from special to normal.
	*/
	- if (psize >= metaslab_force_ganging && (spa_get_random(100) < 3)) {
	+ if (psize >= metaslab_force_ganging && (random_in_range(100) < 3)) {
	metaslab_trace_add(zal, NULL, NULL, psize, d, TRACE_FORCE_GANG,
	allocator);
	return (SET_ERROR(ENOSPC));
	}

	/*
	* Start at the rotor and loop through all mgs until we find something.
	* Note that there's no locking on mca_rotor or mca_aliquot because
	* nothing actually breaks if we miss a few updates -- we just won't
	* allocate quite as evenly. It all balances out over time.
	*
	* If we are doing ditto or log blocks, try to spread them across
	* consecutive vdevs. If we're forced to reuse a vdev before we've
	* allocated all of our ditto blocks, then try and spread them out on
	* that vdev as much as possible. If it turns out to not be possible,
	* gradually lower our standards until anything becomes acceptable.
	* Also, allocating on consecutive vdevs (as opposed to random vdevs)
	* gives us hope of containing our fault domains to something we're
	* able to reason about. Otherwise, any two top-level vdev failures
	* will guarantee the loss of data. With consecutive allocation,
	* only two adjacent top-level vdev failures will result in data loss.
	*
	* If we are doing gang blocks (hintdva is non-NULL), try to keep
	* ourselves on the same vdev as our gang block header. That
	* way, we can hope for locality in vdev_cache, plus it makes our
	* fault domains something tractable.
	*/
	if (hintdva) {
	vd = vdev_lookup_top(spa, DVA_GET_VDEV(&hintdva[d]));

	/*
	* It's possible the vdev we're using as the hint no
	* longer exists or its mg has been closed (e.g. by
	* device removal). Consult the rotor when
	* all else fails.
	*/
	if (vd != NULL && vd->vdev_mg != NULL) {
	mg = vdev_get_mg(vd, mc);

	if (flags & METASLAB_HINTBP_AVOID &&
	mg->mg_next != NULL)
	mg = mg->mg_next;
	} else {
	mg = mca->mca_rotor;
	}
	} else if (d != 0) {
	vd = vdev_lookup_top(spa, DVA_GET_VDEV(&dva[d - 1]));
	mg = vd->vdev_mg->mg_next;
	} else if (flags & METASLAB_FASTWRITE) {
	mg = fast_mg = mca->mca_rotor;

	do {
	if (fast_mg->mg_vd->vdev_pending_fastwrite <
	mg->mg_vd->vdev_pending_fastwrite)
	mg = fast_mg;
	} while ((fast_mg = fast_mg->mg_next) != mca->mca_rotor);

	} else {
	ASSERT(mca->mca_rotor != NULL);
	mg = mca->mca_rotor;
	}

	/*
	* If the hint put us into the wrong metaslab class, or into a
	* metaslab group that has been passivated, just follow the rotor.
	*/
	if (mg->mg_class != mc \|\| mg->mg_activation_count <= 0)
	mg = mca->mca_rotor;

	rotor = mg;
	top:
	do {
	boolean_t allocatable;

	ASSERT(mg->mg_activation_count == 1);
	vd = mg->mg_vd;

	/*
	* Don't allocate from faulted devices.
	*/
	if (try_hard) {
	spa_config_enter(spa, SCL_ZIO, FTAG, RW_READER);
	allocatable = vdev_allocatable(vd);
	spa_config_exit(spa, SCL_ZIO, FTAG);
	} else {
	allocatable = vdev_allocatable(vd);
	}

	/*
	* Determine if the selected metaslab group is eligible
	* for allocations. If we're ganging then don't allow
	* this metaslab group to skip allocations since that would
	* inadvertently return ENOSPC and suspend the pool
	* even though space is still available.
	*/
	if (allocatable && !GANG_ALLOCATION(flags) && !try_hard) {
	allocatable = metaslab_group_allocatable(mg, rotor,
	psize, allocator, d);
	}

	if (!allocatable) {
	metaslab_trace_add(zal, mg, NULL, psize, d,
	TRACE_NOT_ALLOCATABLE, allocator);
	goto next;
	}

	ASSERT(mg->mg_initialized);

	/*
	* Avoid writing single-copy data to a failing,
	* non-redundant vdev, unless we've already tried all
	* other vdevs.
	*/
	if ((vd->vdev_stat.vs_write_errors > 0 \|\|
	vd->vdev_state < VDEV_STATE_HEALTHY) &&
	d == 0 && !try_hard && vd->vdev_children == 0) {
	metaslab_trace_add(zal, mg, NULL, psize, d,
	TRACE_VDEV_ERROR, allocator);
	goto next;
	}

	ASSERT(mg->mg_class == mc);

	uint64_t asize = vdev_psize_to_asize(vd, psize);
	ASSERT(P2PHASE(asize, 1ULL << vd->vdev_ashift) == 0);

	/*
	* If we don't need to try hard, then require that the
	* block be on a different metaslab from any other DVAs
	* in this BP (unique=true). If we are trying hard, then
	* allow any metaslab to be used (unique=false).
	*/
	uint64_t offset = metaslab_group_alloc(mg, zal, asize, txg,
	!try_hard, dva, d, allocator, try_hard);

	if (offset != -1ULL) {
	/*
	* If we've just selected this metaslab group,
	* figure out whether the corresponding vdev is
	* over- or under-used relative to the pool,
	* and set an allocation bias to even it out.
	*
	* Bias is also used to compensate for unequally
	* sized vdevs so that space is allocated fairly.
	*/
	if (mca->mca_aliquot == 0 && metaslab_bias_enabled) {
	vdev_stat_t *vs = &vd->vdev_stat;
	int64_t vs_free = vs->vs_space - vs->vs_alloc;
	int64_t mc_free = mc->mc_space - mc->mc_alloc;
	int64_t ratio;

	/*
	* Calculate how much more or less we should
	* try to allocate from this device during
	* this iteration around the rotor.
	*
	* This basically introduces a zero-centered
	* bias towards the devices with the most
	* free space, while compensating for vdev
	* size differences.
	*
	* Examples:
	* vdev V1 = 16M/128M
	* vdev V2 = 16M/128M
	* ratio(V1) = 100% ratio(V2) = 100%
	*
	* vdev V1 = 16M/128M
	* vdev V2 = 64M/128M
	* ratio(V1) = 127% ratio(V2) = 72%
	*
	* vdev V1 = 16M/128M
	* vdev V2 = 64M/512M
	* ratio(V1) = 40% ratio(V2) = 160%
	*/
	ratio = (vs_free * mc->mc_alloc_groups * 100) /
	(mc_free + 1);
	mg->mg_bias = ((ratio - 100) *
	(int64_t)mg->mg_aliquot) / 100;
	} else if (!metaslab_bias_enabled) {
	mg->mg_bias = 0;
	}

	if ((flags & METASLAB_FASTWRITE) \|\|
	atomic_add_64_nv(&mca->mca_aliquot, asize) >=
	mg->mg_aliquot + mg->mg_bias) {
	mca->mca_rotor = mg->mg_next;
	mca->mca_aliquot = 0;
	}

	DVA_SET_VDEV(&dva[d], vd->vdev_id);
	DVA_SET_OFFSET(&dva[d], offset);
	DVA_SET_GANG(&dva[d],
	((flags & METASLAB_GANG_HEADER) ? 1 : 0));
	DVA_SET_ASIZE(&dva[d], asize);

	if (flags & METASLAB_FASTWRITE) {
	atomic_add_64(&vd->vdev_pending_fastwrite,
	psize);
	}

	return (0);
	}
	next:
	mca->mca_rotor = mg->mg_next;
	mca->mca_aliquot = 0;
	} while ((mg = mg->mg_next) != rotor);

	/*
	* If we haven't tried hard, perhaps do so now.
	*/
	if (!try_hard && (zfs_metaslab_try_hard_before_gang \|\|
	GANG_ALLOCATION(flags) \|\| (flags & METASLAB_ZIL) != 0 \|\|
	psize <= 1 << spa->spa_min_ashift)) {
	METASLABSTAT_BUMP(metaslabstat_try_hard);
	try_hard = B_TRUE;
	goto top;
	}

	bzero(&dva[d], sizeof (dva_t));

	metaslab_trace_add(zal, rotor, NULL, psize, d, TRACE_ENOSPC, allocator);
	return (SET_ERROR(ENOSPC));
	}

	void
	metaslab_free_concrete(vdev_t *vd, uint64_t offset, uint64_t asize,
	boolean_t checkpoint)
	{
	metaslab_t *msp;
	spa_t *spa = vd->vdev_spa;

	ASSERT(vdev_is_concrete(vd));
	ASSERT3U(spa_config_held(spa, SCL_ALL, RW_READER), !=, 0);
	ASSERT3U(offset >> vd->vdev_ms_shift, <, vd->vdev_ms_count);

	msp = vd->vdev_ms[offset >> vd->vdev_ms_shift];

	VERIFY(!msp->ms_condensing);
	VERIFY3U(offset, >=, msp->ms_start);
	VERIFY3U(offset + asize, <=, msp->ms_start + msp->ms_size);
	VERIFY0(P2PHASE(offset, 1ULL << vd->vdev_ashift));
	VERIFY0(P2PHASE(asize, 1ULL << vd->vdev_ashift));

	metaslab_check_free_impl(vd, offset, asize);

	mutex_enter(&msp->ms_lock);
	if (range_tree_is_empty(msp->ms_freeing) &&
	range_tree_is_empty(msp->ms_checkpointing)) {
	vdev_dirty(vd, VDD_METASLAB, msp, spa_syncing_txg(spa));
	}

	if (checkpoint) {
	ASSERT(spa_has_checkpoint(spa));
	range_tree_add(msp->ms_checkpointing, offset, asize);
	} else {
	range_tree_add(msp->ms_freeing, offset, asize);
	}
	mutex_exit(&msp->ms_lock);
	}

	/* ARGSUSED */
	void
	metaslab_free_impl_cb(uint64_t inner_offset, vdev_t *vd, uint64_t offset,
	uint64_t size, void *arg)
	{
	boolean_t *checkpoint = arg;

	ASSERT3P(checkpoint, !=, NULL);

	if (vd->vdev_ops->vdev_op_remap != NULL)
	vdev_indirect_mark_obsolete(vd, offset, size);
	else
	metaslab_free_impl(vd, offset, size, *checkpoint);
	}

	static void
	metaslab_free_impl(vdev_t *vd, uint64_t offset, uint64_t size,
	boolean_t checkpoint)
	{
	spa_t *spa = vd->vdev_spa;

	ASSERT3U(spa_config_held(spa, SCL_ALL, RW_READER), !=, 0);

	if (spa_syncing_txg(spa) > spa_freeze_txg(spa))
	return;

	if (spa->spa_vdev_removal != NULL &&
	spa->spa_vdev_removal->svr_vdev_id == vd->vdev_id &&
	vdev_is_concrete(vd)) {
	/*
	* Note: we check if the vdev is concrete because when
	* we complete the removal, we first change the vdev to be
	* an indirect vdev (in open context), and then (in syncing
	* context) clear spa_vdev_removal.
	*/
	free_from_removing_vdev(vd, offset, size);
	} else if (vd->vdev_ops->vdev_op_remap != NULL) {
	vdev_indirect_mark_obsolete(vd, offset, size);
	vd->vdev_ops->vdev_op_remap(vd, offset, size,
	metaslab_free_impl_cb, &checkpoint);
	} else {
	metaslab_free_concrete(vd, offset, size, checkpoint);
	}
	}

	typedef struct remap_blkptr_cb_arg {
	blkptr_t *rbca_bp;
	spa_remap_cb_t rbca_cb;
	vdev_t *rbca_remap_vd;
	uint64_t rbca_remap_offset;
	void *rbca_cb_arg;
	} remap_blkptr_cb_arg_t;

	static void
	remap_blkptr_cb(uint64_t inner_offset, vdev_t *vd, uint64_t offset,
	uint64_t size, void *arg)
	{
	remap_blkptr_cb_arg_t *rbca = arg;
	blkptr_t *bp = rbca->rbca_bp;

	/* We can not remap split blocks. */
	if (size != DVA_GET_ASIZE(&bp->blk_dva[0]))
	return;
	ASSERT0(inner_offset);

	if (rbca->rbca_cb != NULL) {
	/*
	* At this point we know that we are not handling split
	* blocks and we invoke the callback on the previous
	* vdev which must be indirect.
	*/
	ASSERT3P(rbca->rbca_remap_vd->vdev_ops, ==, &vdev_indirect_ops);

	rbca->rbca_cb(rbca->rbca_remap_vd->vdev_id,
	rbca->rbca_remap_offset, size, rbca->rbca_cb_arg);

	/* set up remap_blkptr_cb_arg for the next call */
	rbca->rbca_remap_vd = vd;
	rbca->rbca_remap_offset = offset;
	}

	/*
	* The phys birth time is that of dva[0]. This ensures that we know
	* when each dva was written, so that resilver can determine which
	* blocks need to be scrubbed (i.e. those written during the time
	* the vdev was offline). It also ensures that the key used in
	* the ARC hash table is unique (i.e. dva[0] + phys_birth). If
	* we didn't change the phys_birth, a lookup in the ARC for a
	* remapped BP could find the data that was previously stored at
	* this vdev + offset.
	*/
	vdev_t *oldvd = vdev_lookup_top(vd->vdev_spa,
	DVA_GET_VDEV(&bp->blk_dva[0]));
	vdev_indirect_births_t *vib = oldvd->vdev_indirect_births;
	bp->blk_phys_birth = vdev_indirect_births_physbirth(vib,
	DVA_GET_OFFSET(&bp->blk_dva[0]), DVA_GET_ASIZE(&bp->blk_dva[0]));

	DVA_SET_VDEV(&bp->blk_dva[0], vd->vdev_id);
	DVA_SET_OFFSET(&bp->blk_dva[0], offset);
	}

	/*
	* If the block pointer contains any indirect DVAs, modify them to refer to
	* concrete DVAs. Note that this will sometimes not be possible, leaving
	* the indirect DVA in place. This happens if the indirect DVA spans multiple
	* segments in the mapping (i.e. it is a "split block").
	*
	* If the BP was remapped, calls the callback on the original dva (note the
	* callback can be called multiple times if the original indirect DVA refers
	* to another indirect DVA, etc).
	*
	* Returns TRUE if the BP was remapped.
	*/
	boolean_t
	spa_remap_blkptr(spa_t spa, blkptr_t bp, spa_remap_cb_t callback, void *arg)
	{
	remap_blkptr_cb_arg_t rbca;

	if (!zfs_remap_blkptr_enable)
	return (B_FALSE);

	if (!spa_feature_is_enabled(spa, SPA_FEATURE_OBSOLETE_COUNTS))
	return (B_FALSE);

	/*
	* Dedup BP's can not be remapped, because ddt_phys_select() depends
	* on DVA[0] being the same in the BP as in the DDT (dedup table).
	*/
	if (BP_GET_DEDUP(bp))
	return (B_FALSE);

	/*
	* Gang blocks can not be remapped, because
	* zio_checksum_gang_verifier() depends on the DVA[0] that's in
	* the BP used to read the gang block header (GBH) being the same
	* as the DVA[0] that we allocated for the GBH.
	*/
	if (BP_IS_GANG(bp))
	return (B_FALSE);

	/*
	* Embedded BP's have no DVA to remap.
	*/
	if (BP_GET_NDVAS(bp) < 1)
	return (B_FALSE);

	/*
	* Note: we only remap dva[0]. If we remapped other dvas, we
	* would no longer know what their phys birth txg is.
	*/
	dva_t *dva = &bp->blk_dva[0];

	uint64_t offset = DVA_GET_OFFSET(dva);
	uint64_t size = DVA_GET_ASIZE(dva);
	vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));

	if (vd->vdev_ops->vdev_op_remap == NULL)
	return (B_FALSE);

	rbca.rbca_bp = bp;
	rbca.rbca_cb = callback;
	rbca.rbca_remap_vd = vd;
	rbca.rbca_remap_offset = offset;
	rbca.rbca_cb_arg = arg;

	/*
	* remap_blkptr_cb() will be called in order for each level of
	* indirection, until a concrete vdev is reached or a split block is
	* encountered. old_vd and old_offset are updated within the callback
	* as we go from the one indirect vdev to the next one (either concrete
	* or indirect again) in that order.
	*/
	vd->vdev_ops->vdev_op_remap(vd, offset, size, remap_blkptr_cb, &rbca);

	/* Check if the DVA wasn't remapped because it is a split block */
	if (DVA_GET_VDEV(&rbca.rbca_bp->blk_dva[0]) == vd->vdev_id)
	return (B_FALSE);

	return (B_TRUE);
	}

	/*
	* Undo the allocation of a DVA which happened in the given transaction group.
	*/
	void
	metaslab_unalloc_dva(spa_t spa, const dva_t dva, uint64_t txg)
	{
	metaslab_t *msp;
	vdev_t *vd;
	uint64_t vdev = DVA_GET_VDEV(dva);
	uint64_t offset = DVA_GET_OFFSET(dva);
	uint64_t size = DVA_GET_ASIZE(dva);

	ASSERT(DVA_IS_VALID(dva));
	ASSERT3U(spa_config_held(spa, SCL_ALL, RW_READER), !=, 0);

	if (txg > spa_freeze_txg(spa))
	return;

	if ((vd = vdev_lookup_top(spa, vdev)) == NULL \|\| !DVA_IS_VALID(dva) \|\|
	(offset >> vd->vdev_ms_shift) >= vd->vdev_ms_count) {
	zfs_panic_recover("metaslab_free_dva(): bad DVA %llu:%llu:%llu",
	(u_longlong_t)vdev, (u_longlong_t)offset,
	(u_longlong_t)size);
	return;
	}

	ASSERT(!vd->vdev_removing);
	ASSERT(vdev_is_concrete(vd));
	ASSERT0(vd->vdev_indirect_config.vic_mapping_object);
	ASSERT3P(vd->vdev_indirect_mapping, ==, NULL);

	if (DVA_GET_GANG(dva))
	size = vdev_gang_header_asize(vd);

	msp = vd->vdev_ms[offset >> vd->vdev_ms_shift];

	mutex_enter(&msp->ms_lock);
	range_tree_remove(msp->ms_allocating[txg & TXG_MASK],
	offset, size);
	msp->ms_allocating_total -= size;

	VERIFY(!msp->ms_condensing);
	VERIFY3U(offset, >=, msp->ms_start);
	VERIFY3U(offset + size, <=, msp->ms_start + msp->ms_size);
	VERIFY3U(range_tree_space(msp->ms_allocatable) + size, <=,
	msp->ms_size);
	VERIFY0(P2PHASE(offset, 1ULL << vd->vdev_ashift));
	VERIFY0(P2PHASE(size, 1ULL << vd->vdev_ashift));
	range_tree_add(msp->ms_allocatable, offset, size);
	mutex_exit(&msp->ms_lock);
	}

	/*
	* Free the block represented by the given DVA.
	*/
	void
	metaslab_free_dva(spa_t spa, const dva_t dva, boolean_t checkpoint)
	{
	uint64_t vdev = DVA_GET_VDEV(dva);
	uint64_t offset = DVA_GET_OFFSET(dva);
	uint64_t size = DVA_GET_ASIZE(dva);
	vdev_t *vd = vdev_lookup_top(spa, vdev);

	ASSERT(DVA_IS_VALID(dva));
	ASSERT3U(spa_config_held(spa, SCL_ALL, RW_READER), !=, 0);

	if (DVA_GET_GANG(dva)) {
	size = vdev_gang_header_asize(vd);
	}

	metaslab_free_impl(vd, offset, size, checkpoint);
	}

	/*
	* Reserve some allocation slots. The reservation system must be called
	* before we call into the allocator. If there aren't any available slots
	* then the I/O will be throttled until an I/O completes and its slots are
	* freed up. The function returns true if it was successful in placing
	* the reservation.
	*/
	boolean_t
	metaslab_class_throttle_reserve(metaslab_class_t *mc, int slots, int allocator,
	zio_t *zio, int flags)
	{
	metaslab_class_allocator_t *mca = &mc->mc_allocator[allocator];
	- uint64_t available_slots = 0;
	- boolean_t slot_reserved = B_FALSE;
	uint64_t max = mca->mca_alloc_max_slots;

	ASSERT(mc->mc_alloc_throttle_enabled);
	- mutex_enter(&mc->mc_lock);
	-
	- uint64_t reserved_slots = zfs_refcount_count(&mca->mca_alloc_slots);
	- if (reserved_slots < max)
	- available_slots = max - reserved_slots;
	-
	- if (slots <= available_slots \|\| GANG_ALLOCATION(flags) \|\|
	- flags & METASLAB_MUST_RESERVE) {
	+ if (GANG_ALLOCATION(flags) \|\| (flags & METASLAB_MUST_RESERVE) \|\|
	+ zfs_refcount_count(&mca->mca_alloc_slots) + slots <= max) {
	/*
	+ * The potential race between _count() and _add() is covered
	+ * by the allocator lock in most cases, or irrelevant due to
	+ * GANG_ALLOCATION() or METASLAB_MUST_RESERVE set in others.
	+ * But even if we assume some other non-existing scenario, the
	+ * worst that can happen is few more I/Os get to allocation
	+ * earlier, that is not a problem.
	+ *
	* We reserve the slots individually so that we can unreserve
	* them individually when an I/O completes.
	*/
	for (int d = 0; d < slots; d++)
	zfs_refcount_add(&mca->mca_alloc_slots, zio);
	zio->io_flags \|= ZIO_FLAG_IO_ALLOCATING;
	- slot_reserved = B_TRUE;
	+ return (B_TRUE);
	}
	-
	- mutex_exit(&mc->mc_lock);
	- return (slot_reserved);
	+ return (B_FALSE);
	}

	void
	metaslab_class_throttle_unreserve(metaslab_class_t *mc, int slots,
	int allocator, zio_t *zio)
	{
	metaslab_class_allocator_t *mca = &mc->mc_allocator[allocator];

	ASSERT(mc->mc_alloc_throttle_enabled);
	- mutex_enter(&mc->mc_lock);
	for (int d = 0; d < slots; d++)
	zfs_refcount_remove(&mca->mca_alloc_slots, zio);
	- mutex_exit(&mc->mc_lock);
	}

	static int
	metaslab_claim_concrete(vdev_t *vd, uint64_t offset, uint64_t size,
	uint64_t txg)
	{
	metaslab_t *msp;
	spa_t *spa = vd->vdev_spa;
	int error = 0;

	if (offset >> vd->vdev_ms_shift >= vd->vdev_ms_count)
	return (SET_ERROR(ENXIO));

	ASSERT3P(vd->vdev_ms, !=, NULL);
	msp = vd->vdev_ms[offset >> vd->vdev_ms_shift];

	mutex_enter(&msp->ms_lock);

	if ((txg != 0 && spa_writeable(spa)) \|\| !msp->ms_loaded) {
	error = metaslab_activate(msp, 0, METASLAB_WEIGHT_CLAIM);
	if (error == EBUSY) {
	ASSERT(msp->ms_loaded);
	ASSERT(msp->ms_weight & METASLAB_ACTIVE_MASK);
	error = 0;
	}
	}

	if (error == 0 &&
	!range_tree_contains(msp->ms_allocatable, offset, size))
	error = SET_ERROR(ENOENT);

	if (error \|\| txg == 0) { /* txg == 0 indicates dry run */
	mutex_exit(&msp->ms_lock);
	return (error);
	}

	VERIFY(!msp->ms_condensing);
	VERIFY0(P2PHASE(offset, 1ULL << vd->vdev_ashift));
	VERIFY0(P2PHASE(size, 1ULL << vd->vdev_ashift));
	VERIFY3U(range_tree_space(msp->ms_allocatable) - size, <=,
	msp->ms_size);
	range_tree_remove(msp->ms_allocatable, offset, size);
	range_tree_clear(msp->ms_trim, offset, size);

	if (spa_writeable(spa)) { /* don't dirty if we're zdb(8) */
	metaslab_class_t *mc = msp->ms_group->mg_class;
	multilist_sublist_t *mls =
	multilist_sublist_lock_obj(&mc->mc_metaslab_txg_list, msp);
	if (!multilist_link_active(&msp->ms_class_txg_node)) {
	msp->ms_selected_txg = txg;
	multilist_sublist_insert_head(mls, msp);
	}
	multilist_sublist_unlock(mls);

	if (range_tree_is_empty(msp->ms_allocating[txg & TXG_MASK]))
	vdev_dirty(vd, VDD_METASLAB, msp, txg);
	range_tree_add(msp->ms_allocating[txg & TXG_MASK],
	offset, size);
	msp->ms_allocating_total += size;
	}

	mutex_exit(&msp->ms_lock);

	return (0);
	}

	typedef struct metaslab_claim_cb_arg_t {
	uint64_t mcca_txg;
	int mcca_error;
	} metaslab_claim_cb_arg_t;

	/* ARGSUSED */
	static void
	metaslab_claim_impl_cb(uint64_t inner_offset, vdev_t *vd, uint64_t offset,
	uint64_t size, void *arg)
	{
	metaslab_claim_cb_arg_t *mcca_arg = arg;

	if (mcca_arg->mcca_error == 0) {
	mcca_arg->mcca_error = metaslab_claim_concrete(vd, offset,
	size, mcca_arg->mcca_txg);
	}
	}

	int
	metaslab_claim_impl(vdev_t *vd, uint64_t offset, uint64_t size, uint64_t txg)
	{
	if (vd->vdev_ops->vdev_op_remap != NULL) {
	metaslab_claim_cb_arg_t arg;

	/*
	* Only zdb(8) can claim on indirect vdevs. This is used
	* to detect leaks of mapped space (that are not accounted
	* for in the obsolete counts, spacemap, or bpobj).
	*/
	ASSERT(!spa_writeable(vd->vdev_spa));
	arg.mcca_error = 0;
	arg.mcca_txg = txg;

	vd->vdev_ops->vdev_op_remap(vd, offset, size,
	metaslab_claim_impl_cb, &arg);

	if (arg.mcca_error == 0) {
	arg.mcca_error = metaslab_claim_concrete(vd,
	offset, size, txg);
	}
	return (arg.mcca_error);
	} else {
	return (metaslab_claim_concrete(vd, offset, size, txg));
	}
	}

	/*
	* Intent log support: upon opening the pool after a crash, notify the SPA
	* of blocks that the intent log has allocated for immediate write, but
	* which are still considered free by the SPA because the last transaction
	* group didn't commit yet.
	*/
	static int
	metaslab_claim_dva(spa_t spa, const dva_t dva, uint64_t txg)
	{
	uint64_t vdev = DVA_GET_VDEV(dva);
	uint64_t offset = DVA_GET_OFFSET(dva);
	uint64_t size = DVA_GET_ASIZE(dva);
	vdev_t *vd;

	if ((vd = vdev_lookup_top(spa, vdev)) == NULL) {
	return (SET_ERROR(ENXIO));
	}

	ASSERT(DVA_IS_VALID(dva));

	if (DVA_GET_GANG(dva))
	size = vdev_gang_header_asize(vd);

	return (metaslab_claim_impl(vd, offset, size, txg));
	}

	int
	metaslab_alloc(spa_t spa, metaslab_class_t mc, uint64_t psize, blkptr_t *bp,
	int ndvas, uint64_t txg, blkptr_t *hintbp, int flags,
	zio_alloc_list_t zal, zio_t zio, int allocator)
	{
	dva_t *dva = bp->blk_dva;
	dva_t *hintdva = (hintbp != NULL) ? hintbp->blk_dva : NULL;
	int error = 0;

	ASSERT(bp->blk_birth == 0);
	ASSERT(BP_PHYSICAL_BIRTH(bp) == 0);

	spa_config_enter(spa, SCL_ALLOC, FTAG, RW_READER);

	if (mc->mc_allocator[allocator].mca_rotor == NULL) {
	/* no vdevs in this class */
	spa_config_exit(spa, SCL_ALLOC, FTAG);
	return (SET_ERROR(ENOSPC));
	}

	ASSERT(ndvas > 0 && ndvas <= spa_max_replication(spa));
	ASSERT(BP_GET_NDVAS(bp) == 0);
	ASSERT(hintbp == NULL \|\| ndvas <= BP_GET_NDVAS(hintbp));
	ASSERT3P(zal, !=, NULL);

	for (int d = 0; d < ndvas; d++) {
	error = metaslab_alloc_dva(spa, mc, psize, dva, d, hintdva,
	txg, flags, zal, allocator);
	if (error != 0) {
	for (d--; d >= 0; d--) {
	metaslab_unalloc_dva(spa, &dva[d], txg);
	metaslab_group_alloc_decrement(spa,
	DVA_GET_VDEV(&dva[d]), zio, flags,
	allocator, B_FALSE);
	bzero(&dva[d], sizeof (dva_t));
	}
	spa_config_exit(spa, SCL_ALLOC, FTAG);
	return (error);
	} else {
	/*
	* Update the metaslab group's queue depth
	* based on the newly allocated dva.
	*/
	metaslab_group_alloc_increment(spa,
	DVA_GET_VDEV(&dva[d]), zio, flags, allocator);
	}
	}
	ASSERT(error == 0);
	ASSERT(BP_GET_NDVAS(bp) == ndvas);

	spa_config_exit(spa, SCL_ALLOC, FTAG);

	BP_SET_BIRTH(bp, txg, 0);

	return (0);
	}

	void
	metaslab_free(spa_t spa, const blkptr_t bp, uint64_t txg, boolean_t now)
	{
	const dva_t *dva = bp->blk_dva;
	int ndvas = BP_GET_NDVAS(bp);

	ASSERT(!BP_IS_HOLE(bp));
	ASSERT(!now \|\| bp->blk_birth >= spa_syncing_txg(spa));

	/*
	* If we have a checkpoint for the pool we need to make sure that
	* the blocks that we free that are part of the checkpoint won't be
	* reused until the checkpoint is discarded or we revert to it.
	*
	* The checkpoint flag is passed down the metaslab_free code path
	* and is set whenever we want to add a block to the checkpoint's
	* accounting. That is, we "checkpoint" blocks that existed at the
	* time the checkpoint was created and are therefore referenced by
	* the checkpointed uberblock.
	*
	* Note that, we don't checkpoint any blocks if the current
	* syncing txg <= spa_checkpoint_txg. We want these frees to sync
	* normally as they will be referenced by the checkpointed uberblock.
	*/
	boolean_t checkpoint = B_FALSE;
	if (bp->blk_birth <= spa->spa_checkpoint_txg &&
	spa_syncing_txg(spa) > spa->spa_checkpoint_txg) {
	/*
	* At this point, if the block is part of the checkpoint
	* there is no way it was created in the current txg.
	*/
	ASSERT(!now);
	ASSERT3U(spa_syncing_txg(spa), ==, txg);
	checkpoint = B_TRUE;
	}

	spa_config_enter(spa, SCL_FREE, FTAG, RW_READER);

	for (int d = 0; d < ndvas; d++) {
	if (now) {
	metaslab_unalloc_dva(spa, &dva[d], txg);
	} else {
	ASSERT3U(txg, ==, spa_syncing_txg(spa));
	metaslab_free_dva(spa, &dva[d], checkpoint);
	}
	}

	spa_config_exit(spa, SCL_FREE, FTAG);
	}

	int
	metaslab_claim(spa_t spa, const blkptr_t bp, uint64_t txg)
	{
	const dva_t *dva = bp->blk_dva;
	int ndvas = BP_GET_NDVAS(bp);
	int error = 0;

	ASSERT(!BP_IS_HOLE(bp));

	if (txg != 0) {
	/*
	* First do a dry run to make sure all DVAs are claimable,
	* so we don't have to unwind from partial failures below.
	*/
	if ((error = metaslab_claim(spa, bp, 0)) != 0)
	return (error);
	}

	spa_config_enter(spa, SCL_ALLOC, FTAG, RW_READER);

	for (int d = 0; d < ndvas; d++) {
	error = metaslab_claim_dva(spa, &dva[d], txg);
	if (error != 0)
	break;
	}

	spa_config_exit(spa, SCL_ALLOC, FTAG);

	ASSERT(error == 0 \|\| txg == 0);

	return (error);
	}

	void
	metaslab_fastwrite_mark(spa_t spa, const blkptr_t bp)
	{
	const dva_t *dva = bp->blk_dva;
	int ndvas = BP_GET_NDVAS(bp);
	uint64_t psize = BP_GET_PSIZE(bp);
	int d;
	vdev_t *vd;

	ASSERT(!BP_IS_HOLE(bp));
	ASSERT(!BP_IS_EMBEDDED(bp));
	ASSERT(psize > 0);

	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);

	for (d = 0; d < ndvas; d++) {
	if ((vd = vdev_lookup_top(spa, DVA_GET_VDEV(&dva[d]))) == NULL)
	continue;
	atomic_add_64(&vd->vdev_pending_fastwrite, psize);
	}

	spa_config_exit(spa, SCL_VDEV, FTAG);
	}

	void
	metaslab_fastwrite_unmark(spa_t spa, const blkptr_t bp)
	{
	const dva_t *dva = bp->blk_dva;
	int ndvas = BP_GET_NDVAS(bp);
	uint64_t psize = BP_GET_PSIZE(bp);
	int d;
	vdev_t *vd;

	ASSERT(!BP_IS_HOLE(bp));
	ASSERT(!BP_IS_EMBEDDED(bp));
	ASSERT(psize > 0);

	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);

	for (d = 0; d < ndvas; d++) {
	if ((vd = vdev_lookup_top(spa, DVA_GET_VDEV(&dva[d]))) == NULL)
	continue;
	ASSERT3U(vd->vdev_pending_fastwrite, >=, psize);
	atomic_sub_64(&vd->vdev_pending_fastwrite, psize);
	}

	spa_config_exit(spa, SCL_VDEV, FTAG);
	}

	/* ARGSUSED */
	static void
	metaslab_check_free_impl_cb(uint64_t inner, vdev_t *vd, uint64_t offset,
	uint64_t size, void *arg)
	{
	if (vd->vdev_ops == &vdev_indirect_ops)
	return;

	metaslab_check_free_impl(vd, offset, size);
	}

	static void
	metaslab_check_free_impl(vdev_t *vd, uint64_t offset, uint64_t size)
	{
	metaslab_t *msp;
	spa_t *spa __maybe_unused = vd->vdev_spa;

	if ((zfs_flags & ZFS_DEBUG_ZIO_FREE) == 0)
	return;

	if (vd->vdev_ops->vdev_op_remap != NULL) {
	vd->vdev_ops->vdev_op_remap(vd, offset, size,
	metaslab_check_free_impl_cb, NULL);
	return;
	}

	ASSERT(vdev_is_concrete(vd));
	ASSERT3U(offset >> vd->vdev_ms_shift, <, vd->vdev_ms_count);
	ASSERT3U(spa_config_held(spa, SCL_ALL, RW_READER), !=, 0);

	msp = vd->vdev_ms[offset >> vd->vdev_ms_shift];

	mutex_enter(&msp->ms_lock);
	if (msp->ms_loaded) {
	range_tree_verify_not_present(msp->ms_allocatable,
	offset, size);
	}

	/*
	* Check all segments that currently exist in the freeing pipeline.
	*
	* It would intuitively make sense to also check the current allocating
	* tree since metaslab_unalloc_dva() exists for extents that are
	* allocated and freed in the same sync pass within the same txg.
	* Unfortunately there are places (e.g. the ZIL) where we allocate a
	* segment but then we free part of it within the same txg
	* [see zil_sync()]. Thus, we don't call range_tree_verify() in the
	* current allocating tree.
	*/
	range_tree_verify_not_present(msp->ms_freeing, offset, size);
	range_tree_verify_not_present(msp->ms_checkpointing, offset, size);
	range_tree_verify_not_present(msp->ms_freed, offset, size);
	for (int j = 0; j < TXG_DEFER_SIZE; j++)
	range_tree_verify_not_present(msp->ms_defer[j], offset, size);
	range_tree_verify_not_present(msp->ms_trim, offset, size);
	mutex_exit(&msp->ms_lock);
	}

	void
	metaslab_check_free(spa_t spa, const blkptr_t bp)
	{
	if ((zfs_flags & ZFS_DEBUG_ZIO_FREE) == 0)
	return;

	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
	for (int i = 0; i < BP_GET_NDVAS(bp); i++) {
	uint64_t vdev = DVA_GET_VDEV(&bp->blk_dva[i]);
	vdev_t *vd = vdev_lookup_top(spa, vdev);
	uint64_t offset = DVA_GET_OFFSET(&bp->blk_dva[i]);
	uint64_t size = DVA_GET_ASIZE(&bp->blk_dva[i]);

	if (DVA_GET_GANG(&bp->blk_dva[i]))
	size = vdev_gang_header_asize(vd);

	ASSERT3P(vd, !=, NULL);

	metaslab_check_free_impl(vd, offset, size);
	}
	spa_config_exit(spa, SCL_VDEV, FTAG);
	}

	static void
	metaslab_group_disable_wait(metaslab_group_t *mg)
	{
	ASSERT(MUTEX_HELD(&mg->mg_ms_disabled_lock));
	while (mg->mg_disabled_updating) {
	cv_wait(&mg->mg_ms_disabled_cv, &mg->mg_ms_disabled_lock);
	}
	}

	static void
	metaslab_group_disabled_increment(metaslab_group_t *mg)
	{
	ASSERT(MUTEX_HELD(&mg->mg_ms_disabled_lock));
	ASSERT(mg->mg_disabled_updating);

	while (mg->mg_ms_disabled >= max_disabled_ms) {
	cv_wait(&mg->mg_ms_disabled_cv, &mg->mg_ms_disabled_lock);
	}
	mg->mg_ms_disabled++;
	ASSERT3U(mg->mg_ms_disabled, <=, max_disabled_ms);
	}

	/*
	* Mark the metaslab as disabled to prevent any allocations on this metaslab.
	* We must also track how many metaslabs are currently disabled within a
	* metaslab group and limit them to prevent allocation failures from
	* occurring because all metaslabs are disabled.
	*/
	void
	metaslab_disable(metaslab_t *msp)
	{
	ASSERT(!MUTEX_HELD(&msp->ms_lock));
	metaslab_group_t *mg = msp->ms_group;

	mutex_enter(&mg->mg_ms_disabled_lock);

	/*
	* To keep an accurate count of how many threads have disabled
	* a specific metaslab group, we only allow one thread to mark
	* the metaslab group at a time. This ensures that the value of
	* ms_disabled will be accurate when we decide to mark a metaslab
	* group as disabled. To do this we force all other threads
	* to wait till the metaslab's mg_disabled_updating flag is no
	* longer set.
	*/
	metaslab_group_disable_wait(mg);
	mg->mg_disabled_updating = B_TRUE;
	if (msp->ms_disabled == 0) {
	metaslab_group_disabled_increment(mg);
	}
	mutex_enter(&msp->ms_lock);
	msp->ms_disabled++;
	mutex_exit(&msp->ms_lock);

	mg->mg_disabled_updating = B_FALSE;
	cv_broadcast(&mg->mg_ms_disabled_cv);
	mutex_exit(&mg->mg_ms_disabled_lock);
	}

	void
	metaslab_enable(metaslab_t *msp, boolean_t sync, boolean_t unload)
	{
	metaslab_group_t *mg = msp->ms_group;
	spa_t *spa = mg->mg_vd->vdev_spa;

	/*
	* Wait for the outstanding IO to be synced to prevent newly
	* allocated blocks from being overwritten. This used by
	* initialize and TRIM which are modifying unallocated space.
	*/
	if (sync)
	txg_wait_synced(spa_get_dsl(spa), 0);

	mutex_enter(&mg->mg_ms_disabled_lock);
	mutex_enter(&msp->ms_lock);
	if (--msp->ms_disabled == 0) {
	mg->mg_ms_disabled--;
	cv_broadcast(&mg->mg_ms_disabled_cv);
	if (unload)
	metaslab_unload(msp);
	}
	mutex_exit(&msp->ms_lock);
	mutex_exit(&mg->mg_ms_disabled_lock);
	}

	static void
	metaslab_update_ondisk_flush_data(metaslab_t ms, dmu_tx_t tx)
	{
	vdev_t *vd = ms->ms_group->mg_vd;
	spa_t *spa = vd->vdev_spa;
	objset_t *mos = spa_meta_objset(spa);

	ASSERT(spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP));

	metaslab_unflushed_phys_t entry = {
	.msp_unflushed_txg = metaslab_unflushed_txg(ms),
	};
	uint64_t entry_size = sizeof (entry);
	uint64_t entry_offset = ms->ms_id * entry_size;

	uint64_t object = 0;
	int err = zap_lookup(mos, vd->vdev_top_zap,
	VDEV_TOP_ZAP_MS_UNFLUSHED_PHYS_TXGS, sizeof (uint64_t), 1,
	&object);
	if (err == ENOENT) {
	object = dmu_object_alloc(mos, DMU_OTN_UINT64_METADATA,
	SPA_OLD_MAXBLOCKSIZE, DMU_OT_NONE, 0, tx);
	VERIFY0(zap_add(mos, vd->vdev_top_zap,
	VDEV_TOP_ZAP_MS_UNFLUSHED_PHYS_TXGS, sizeof (uint64_t), 1,
	&object, tx));
	} else {
	VERIFY0(err);
	}

	dmu_write(spa_meta_objset(spa), object, entry_offset, entry_size,
	&entry, tx);
	}

	void
	metaslab_set_unflushed_txg(metaslab_t ms, uint64_t txg, dmu_tx_t tx)
	{
	spa_t *spa = ms->ms_group->mg_vd->vdev_spa;

	if (!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))
	return;

	ms->ms_unflushed_txg = txg;
	metaslab_update_ondisk_flush_data(ms, tx);
	}

	uint64_t
	metaslab_unflushed_txg(metaslab_t *ms)
	{
	return (ms->ms_unflushed_txg);
	}

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, aliquot, ULONG, ZMOD_RW,
	"Allocation granularity (a.k.a. stripe size)");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, debug_load, INT, ZMOD_RW,
	"Load all metaslabs when pool is first opened");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, debug_unload, INT, ZMOD_RW,
	"Prevent metaslabs from being unloaded");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, preload_enabled, INT, ZMOD_RW,
	"Preload potential metaslabs during reassessment");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, unload_delay, INT, ZMOD_RW,
	"Delay in txgs after metaslab was last used before unloading");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, unload_delay_ms, INT, ZMOD_RW,
	"Delay in milliseconds after metaslab was last used before unloading");

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_mg, zfs_mg_, noalloc_threshold, INT, ZMOD_RW,
	"Percentage of metaslab group size that should be free to make it "
	"eligible for allocation");

	ZFS_MODULE_PARAM(zfs_mg, zfs_mg_, fragmentation_threshold, INT, ZMOD_RW,
	"Percentage of metaslab group size that should be considered eligible "
	"for allocations unless all metaslab groups within the metaslab class "
	"have also crossed this threshold");

	ZFS_MODULE_PARAM(zfs_metaslab, zfs_metaslab_, fragmentation_threshold, INT,
	ZMOD_RW, "Fragmentation for metaslab to allow allocation");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, fragmentation_factor_enabled, INT, ZMOD_RW,
	"Use the fragmentation metric to prefer less fragmented metaslabs");
	/* END CSTYLED */

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, lba_weighting_enabled, INT, ZMOD_RW,
	"Prefer metaslabs with lower LBAs");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, bias_enabled, INT, ZMOD_RW,
	"Enable metaslab group biasing");

	ZFS_MODULE_PARAM(zfs_metaslab, zfs_metaslab_, segment_weight_enabled, INT,
	ZMOD_RW, "Enable segment-based metaslab selection");

	ZFS_MODULE_PARAM(zfs_metaslab, zfs_metaslab_, switch_threshold, INT, ZMOD_RW,
	"Segment-based metaslab selection maximum buckets before switching");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, force_ganging, ULONG, ZMOD_RW,
	"Blocks larger than this size are forced to be gang blocks");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, df_max_search, INT, ZMOD_RW,
	"Max distance (bytes) to search forward before using size tree");

	ZFS_MODULE_PARAM(zfs_metaslab, metaslab_, df_use_largest_segment, INT, ZMOD_RW,
	"When looking in size tree, use largest segment instead of exact fit");

	ZFS_MODULE_PARAM(zfs_metaslab, zfs_metaslab_, max_size_cache_sec, ULONG,
	ZMOD_RW, "How long to trust the cached max chunk size of a metaslab");

	ZFS_MODULE_PARAM(zfs_metaslab, zfs_metaslab_, mem_limit, INT, ZMOD_RW,
	"Percentage of memory that can be used to store metaslab range trees");

	ZFS_MODULE_PARAM(zfs_metaslab, zfs_metaslab_, try_hard_before_gang, INT,
	ZMOD_RW, "Try hard to allocate before ganging");

	ZFS_MODULE_PARAM(zfs_metaslab, zfs_metaslab_, find_max_tries, INT, ZMOD_RW,
	"Normally only consider this many of the best metaslabs in each vdev");
	diff --git a/sys/contrib/openzfs/module/zfs/mmp.c b/sys/contrib/openzfs/module/zfs/mmp.c
	index d9ed457a7107..f67a4eb22a2d 100644
	--- a/sys/contrib/openzfs/module/zfs/mmp.c
	+++ b/sys/contrib/openzfs/module/zfs/mmp.c
	@@ -1,744 +1,744 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2017 by Lawrence Livermore National Security, LLC.
	*/

	#include <sys/abd.h>
	#include <sys/mmp.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/time.h>
	#include <sys/vdev.h>
	#include <sys/vdev_impl.h>
	#include <sys/zfs_context.h>
	#include <sys/callb.h>

	/*
	* Multi-Modifier Protection (MMP) attempts to prevent a user from importing
	* or opening a pool on more than one host at a time. In particular, it
	* prevents "zpool import -f" on a host from succeeding while the pool is
	* already imported on another host. There are many other ways in which a
	* device could be used by two hosts for different purposes at the same time
	* resulting in pool damage. This implementation does not attempt to detect
	* those cases.
	*
	* MMP operates by ensuring there are frequent visible changes on disk (a
	* "heartbeat") at all times. And by altering the import process to check
	* for these changes and failing the import when they are detected. This
	* functionality is enabled by setting the 'multihost' pool property to on.
	*
	* Uberblocks written by the txg_sync thread always go into the first
	* (N-MMP_BLOCKS_PER_LABEL) slots, the remaining slots are reserved for MMP.
	* They are used to hold uberblocks which are exactly the same as the last
	* synced uberblock except that the ub_timestamp and mmp_config are frequently
	* updated. Like all other uberblocks, the slot is written with an embedded
	* checksum, and slots with invalid checksums are ignored. This provides the
	* "heartbeat", with no risk of overwriting good uberblocks that must be
	* preserved, e.g. previous txgs and associated block pointers.
	*
	* Three optional fields are added to uberblock structure; ub_mmp_magic,
	* ub_mmp_config, and ub_mmp_delay. The ub_mmp_magic value allows zfs to tell
	* whether the other ub_mmp_* fields are valid. The ub_mmp_config field tells
	* the importing host the settings of zfs_multihost_interval and
	* zfs_multihost_fail_intervals on the host which last had (or currently has)
	* the pool imported. These determine how long a host must wait to detect
	* activity in the pool, before concluding the pool is not in use. The
	* mmp_delay field is a decaying average of the amount of time between
	* completion of successive MMP writes, in nanoseconds. It indicates whether
	* MMP is enabled.
	*
	* During import an activity test may now be performed to determine if
	* the pool is in use. The activity test is typically required if the
	* ZPOOL_CONFIG_HOSTID does not match the system hostid, the pool state is
	* POOL_STATE_ACTIVE, and the pool is not a root pool.
	*
	* The activity test finds the "best" uberblock (highest txg, timestamp, and, if
	* ub_mmp_magic is valid, sequence number from ub_mmp_config). It then waits
	* some time, and finds the "best" uberblock again. If any of the mentioned
	* fields have different values in the newly read uberblock, the pool is in use
	* by another host and the import fails. In order to assure the accuracy of the
	* activity test, the default values result in an activity test duration of 20x
	* the mmp write interval.
	*
	* The duration of the "zpool import" activity test depends on the information
	* available in the "best" uberblock:
	*
	* 1) If uberblock was written by zfs-0.8 or newer and fail_intervals > 0:
	* ub_mmp_config.fail_intervals * ub_mmp_config.multihost_interval * 2
	*
	* In this case, a weak guarantee is provided. Since the host which last had
	* the pool imported will suspend the pool if no mmp writes land within
	* fail_intervals * multihost_interval ms, the absence of writes during that
	* time means either the pool is not imported, or it is imported but the pool
	* is suspended and no further writes will occur.
	*
	* Note that resuming the suspended pool on the remote host would invalidate
	* this guarantee, and so it is not allowed.
	*
	* The factor of 2 provides a conservative safety factor and derives from
	* MMP_IMPORT_SAFETY_FACTOR;
	*
	* 2) If uberblock was written by zfs-0.8 or newer and fail_intervals == 0:
	* (ub_mmp_config.multihost_interval + ub_mmp_delay) *
	* zfs_multihost_import_intervals
	*
	* In this case no guarantee can provided. However, as long as some devices
	* are healthy and connected, it is likely that at least one write will land
	* within (multihost_interval + mmp_delay) because multihost_interval is
	* enough time for a write to be attempted to each leaf vdev, and mmp_delay
	* is enough for one to land, based on past delays. Multiplying by
	* zfs_multihost_import_intervals provides a conservative safety factor.
	*
	* 3) If uberblock was written by zfs-0.7:
	* (zfs_multihost_interval + ub_mmp_delay) * zfs_multihost_import_intervals
	*
	* The same logic as case #2 applies, but we do not know remote tunables.
	*
	* We use the local value for zfs_multihost_interval because the original MMP
	* did not record this value in the uberblock.
	*
	* ub_mmp_delay >= (zfs_multihost_interval / leaves), so if the other host
	* has a much larger zfs_multihost_interval set, ub_mmp_delay will reflect
	* that. We will have waited enough time for zfs_multihost_import_intervals
	* writes to be issued and all but one to land.
	*
	* single device pool example delays
	*
	* import_delay = (1 + 1) * 20 = 40s #defaults, no I/O delay
	* import_delay = (1 + 10) * 20 = 220s #defaults, 10s I/O delay
	* import_delay = (10 + 10) * 20 = 400s #10s multihost_interval,
	* no I/O delay
	* 100 device pool example delays
	*
	* import_delay = (1 + .01) * 20 = 20s #defaults, no I/O delay
	* import_delay = (1 + 10) * 20 = 220s #defaults, 10s I/O delay
	* import_delay = (10 + .1) * 20 = 202s #10s multihost_interval,
	* no I/O delay
	*
	* 4) Otherwise, this uberblock was written by a pre-MMP zfs:
	* zfs_multihost_import_intervals * zfs_multihost_interval
	*
	* In this case local tunables are used. By default this product = 10s, long
	* enough for a pool with any activity at all to write at least one
	* uberblock. No guarantee can be provided.
	*
	* Additionally, the duration is then extended by a random 25% to attempt to to
	* detect simultaneous imports. For example, if both partner hosts are rebooted
	* at the same time and automatically attempt to import the pool.
	*/

	/*
	* Used to control the frequency of mmp writes which are performed when the
	* 'multihost' pool property is on. This is one factor used to determine the
	* length of the activity check during import.
	*
	* On average an mmp write will be issued for each leaf vdev every
	* zfs_multihost_interval milliseconds. In practice, the observed period can
	* vary with the I/O load and this observed value is the ub_mmp_delay which is
	* stored in the uberblock. The minimum allowed value is 100 ms.
	*/
	ulong_t zfs_multihost_interval = MMP_DEFAULT_INTERVAL;

	/*
	* Used to control the duration of the activity test on import. Smaller values
	* of zfs_multihost_import_intervals will reduce the import time but increase
	* the risk of failing to detect an active pool. The total activity check time
	* is never allowed to drop below one second. A value of 0 is ignored and
	* treated as if it was set to 1.
	*/
	uint_t zfs_multihost_import_intervals = MMP_DEFAULT_IMPORT_INTERVALS;

	/*
	* Controls the behavior of the pool when mmp write failures or delays are
	* detected.
	*
	* When zfs_multihost_fail_intervals = 0, mmp write failures or delays are
	* ignored. The failures will still be reported to the ZED which depending on
	* its configuration may take action such as suspending the pool or taking a
	* device offline.
	*
	* When zfs_multihost_fail_intervals > 0, the pool will be suspended if
	* zfs_multihost_fail_intervals * zfs_multihost_interval milliseconds pass
	* without a successful mmp write. This guarantees the activity test will see
	* mmp writes if the pool is imported. A value of 1 is ignored and treated as
	* if it was set to 2, because a single leaf vdev pool will issue a write once
	* per multihost_interval and thus any variation in latency would cause the
	* pool to be suspended.
	*/
	uint_t zfs_multihost_fail_intervals = MMP_DEFAULT_FAIL_INTERVALS;

	char *mmp_tag = "mmp_write_uberblock";
	static void mmp_thread(void *arg);

	void
	mmp_init(spa_t *spa)
	{
	mmp_thread_t *mmp = &spa->spa_mmp;

	mutex_init(&mmp->mmp_thread_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&mmp->mmp_thread_cv, NULL, CV_DEFAULT, NULL);
	mutex_init(&mmp->mmp_io_lock, NULL, MUTEX_DEFAULT, NULL);
	mmp->mmp_kstat_id = 1;
	}

	void
	mmp_fini(spa_t *spa)
	{
	mmp_thread_t *mmp = &spa->spa_mmp;

	mutex_destroy(&mmp->mmp_thread_lock);
	cv_destroy(&mmp->mmp_thread_cv);
	mutex_destroy(&mmp->mmp_io_lock);
	}

	static void
	mmp_thread_enter(mmp_thread_t mmp, callb_cpr_t cpr)
	{
	CALLB_CPR_INIT(cpr, &mmp->mmp_thread_lock, callb_generic_cpr, FTAG);
	mutex_enter(&mmp->mmp_thread_lock);
	}

	static void
	mmp_thread_exit(mmp_thread_t mmp, kthread_t mpp, callb_cpr_t cpr)
	{
	ASSERT(*mpp != NULL);
	*mpp = NULL;
	cv_broadcast(&mmp->mmp_thread_cv);
	CALLB_CPR_EXIT(cpr); /* drops &mmp->mmp_thread_lock */
	thread_exit();
	}

	void
	mmp_thread_start(spa_t *spa)
	{
	mmp_thread_t *mmp = &spa->spa_mmp;

	if (spa_writeable(spa)) {
	mutex_enter(&mmp->mmp_thread_lock);
	if (!mmp->mmp_thread) {
	mmp->mmp_thread = thread_create(NULL, 0, mmp_thread,
	spa, 0, &p0, TS_RUN, defclsyspri);
	zfs_dbgmsg("MMP thread started pool '%s' "
	"gethrtime %llu", spa_name(spa), gethrtime());
	}
	mutex_exit(&mmp->mmp_thread_lock);
	}
	}

	void
	mmp_thread_stop(spa_t *spa)
	{
	mmp_thread_t *mmp = &spa->spa_mmp;

	mutex_enter(&mmp->mmp_thread_lock);
	mmp->mmp_thread_exiting = 1;
	cv_broadcast(&mmp->mmp_thread_cv);

	while (mmp->mmp_thread) {
	cv_wait(&mmp->mmp_thread_cv, &mmp->mmp_thread_lock);
	}
	mutex_exit(&mmp->mmp_thread_lock);
	zfs_dbgmsg("MMP thread stopped pool '%s' gethrtime %llu",
	spa_name(spa), gethrtime());

	ASSERT(mmp->mmp_thread == NULL);
	mmp->mmp_thread_exiting = 0;
	}

	typedef enum mmp_vdev_state_flag {
	MMP_FAIL_NOT_WRITABLE = (1 << 0),
	MMP_FAIL_WRITE_PENDING = (1 << 1),
	} mmp_vdev_state_flag_t;

	/*
	* Find a leaf vdev to write an MMP block to. It must not have an outstanding
	* mmp write (if so a new write will also likely block). If there is no usable
	* leaf, a nonzero error value is returned. The error value returned is a bit
	* field.
	*
	* MMP_FAIL_WRITE_PENDING One or more leaf vdevs are writeable, but have an
	* outstanding MMP write.
	* MMP_FAIL_NOT_WRITABLE One or more leaf vdevs are not writeable.
	*/

	static int
	mmp_next_leaf(spa_t *spa)
	{
	vdev_t *leaf;
	vdev_t *starting_leaf;
	int fail_mask = 0;

	ASSERT(MUTEX_HELD(&spa->spa_mmp.mmp_io_lock));
	ASSERT(spa_config_held(spa, SCL_STATE, RW_READER));
	ASSERT(list_link_active(&spa->spa_leaf_list.list_head) == B_TRUE);
	ASSERT(!list_is_empty(&spa->spa_leaf_list));

	if (spa->spa_mmp.mmp_leaf_last_gen != spa->spa_leaf_list_gen) {
	spa->spa_mmp.mmp_last_leaf = list_head(&spa->spa_leaf_list);
	spa->spa_mmp.mmp_leaf_last_gen = spa->spa_leaf_list_gen;
	}

	leaf = spa->spa_mmp.mmp_last_leaf;
	if (leaf == NULL)
	leaf = list_head(&spa->spa_leaf_list);
	starting_leaf = leaf;

	do {
	leaf = list_next(&spa->spa_leaf_list, leaf);
	if (leaf == NULL)
	leaf = list_head(&spa->spa_leaf_list);

	/*
	* We skip unwritable, offline, detached, and dRAID spare
	* devices as they are either not legal targets or the write
	* may fail or not be seen by other hosts. Skipped dRAID
	* spares can never be written so the fail mask is not set.
	*/
	if (!vdev_writeable(leaf) \|\| leaf->vdev_offline \|\|
	leaf->vdev_detached) {
	fail_mask \|= MMP_FAIL_NOT_WRITABLE;
	} else if (leaf->vdev_ops == &vdev_draid_spare_ops) {
	continue;
	} else if (leaf->vdev_mmp_pending != 0) {
	fail_mask \|= MMP_FAIL_WRITE_PENDING;
	} else {
	spa->spa_mmp.mmp_last_leaf = leaf;
	return (0);
	}
	} while (leaf != starting_leaf);

	ASSERT(fail_mask);

	return (fail_mask);
	}

	/*
	* MMP writes are issued on a fixed schedule, but may complete at variable,
	* much longer, intervals. The mmp_delay captures long periods between
	* successful writes for any reason, including disk latency, scheduling delays,
	* etc.
	*
	* The mmp_delay is usually calculated as a decaying average, but if the latest
	* delay is higher we do not average it, so that we do not hide sudden spikes
	* which the importing host must wait for.
	*
	* If writes are occurring frequently, such as due to a high rate of txg syncs,
	* the mmp_delay could become very small. Since those short delays depend on
	* activity we cannot count on, we never allow mmp_delay to get lower than rate
	* expected if only mmp_thread writes occur.
	*
	* If an mmp write was skipped or fails, and we have already waited longer than
	* mmp_delay, we need to update it so the next write reflects the longer delay.
	*
	* Do not set mmp_delay if the multihost property is not on, so as not to
	* trigger an activity check on import.
	*/
	static void
	mmp_delay_update(spa_t *spa, boolean_t write_completed)
	{
	mmp_thread_t *mts = &spa->spa_mmp;
	hrtime_t delay = gethrtime() - mts->mmp_last_write;

	ASSERT(MUTEX_HELD(&mts->mmp_io_lock));

	if (spa_multihost(spa) == B_FALSE) {
	mts->mmp_delay = 0;
	return;
	}

	if (delay > mts->mmp_delay)
	mts->mmp_delay = delay;

	if (write_completed == B_FALSE)
	return;

	mts->mmp_last_write = gethrtime();

	/*
	* strictly less than, in case delay was changed above.
	*/
	if (delay < mts->mmp_delay) {
	hrtime_t min_delay =
	MSEC2NSEC(MMP_INTERVAL_OK(zfs_multihost_interval)) /
	MAX(1, vdev_count_leaves(spa));
	mts->mmp_delay = MAX(((delay + mts->mmp_delay * 127) / 128),
	min_delay);
	}
	}

	static void
	mmp_write_done(zio_t *zio)
	{
	spa_t *spa = zio->io_spa;
	vdev_t *vd = zio->io_vd;
	mmp_thread_t *mts = zio->io_private;

	mutex_enter(&mts->mmp_io_lock);
	uint64_t mmp_kstat_id = vd->vdev_mmp_kstat_id;
	hrtime_t mmp_write_duration = gethrtime() - vd->vdev_mmp_pending;

	mmp_delay_update(spa, (zio->io_error == 0));

	vd->vdev_mmp_pending = 0;
	vd->vdev_mmp_kstat_id = 0;

	mutex_exit(&mts->mmp_io_lock);
	spa_config_exit(spa, SCL_STATE, mmp_tag);

	spa_mmp_history_set(spa, mmp_kstat_id, zio->io_error,
	mmp_write_duration);

	abd_free(zio->io_abd);
	}

	/*
	* When the uberblock on-disk is updated by a spa_sync,
	* creating a new "best" uberblock, update the one stored
	* in the mmp thread state, used for mmp writes.
	*/
	void
	mmp_update_uberblock(spa_t spa, uberblock_t ub)
	{
	mmp_thread_t *mmp = &spa->spa_mmp;

	mutex_enter(&mmp->mmp_io_lock);
	mmp->mmp_ub = *ub;
	mmp->mmp_seq = 1;
	mmp->mmp_ub.ub_timestamp = gethrestime_sec();
	mmp_delay_update(spa, B_TRUE);
	mutex_exit(&mmp->mmp_io_lock);
	}

	/*
	* Choose a random vdev, label, and MMP block, and write over it
	* with a copy of the last-synced uberblock, whose timestamp
	* has been updated to reflect that the pool is in use.
	*/
	static void
	mmp_write_uberblock(spa_t *spa)
	{
	int flags = ZIO_FLAG_CONFIG_WRITER \| ZIO_FLAG_CANFAIL;
	mmp_thread_t *mmp = &spa->spa_mmp;
	uberblock_t *ub;
	vdev_t *vd = NULL;
	int label, error;
	uint64_t offset;

	hrtime_t lock_acquire_time = gethrtime();
	spa_config_enter(spa, SCL_STATE, mmp_tag, RW_READER);
	lock_acquire_time = gethrtime() - lock_acquire_time;
	if (lock_acquire_time > (MSEC2NSEC(MMP_MIN_INTERVAL) / 10))
	zfs_dbgmsg("MMP SCL_STATE acquisition pool '%s' took %llu ns "
	"gethrtime %llu", spa_name(spa), lock_acquire_time,
	gethrtime());

	mutex_enter(&mmp->mmp_io_lock);

	error = mmp_next_leaf(spa);

	/*
	* spa_mmp_history has two types of entries:
	* Issued MMP write: records time issued, error status, etc.
	* Skipped MMP write: an MMP write could not be issued because no
	* suitable leaf vdev was available. See comment above struct
	* spa_mmp_history for details.
	*/

	if (error) {
	mmp_delay_update(spa, B_FALSE);
	if (mmp->mmp_skip_error == error) {
	spa_mmp_history_set_skip(spa, mmp->mmp_kstat_id - 1);
	} else {
	mmp->mmp_skip_error = error;
	spa_mmp_history_add(spa, mmp->mmp_ub.ub_txg,
	gethrestime_sec(), mmp->mmp_delay, NULL, 0,
	mmp->mmp_kstat_id++, error);
	zfs_dbgmsg("MMP error choosing leaf pool '%s' "
	"gethrtime %llu fail_mask %#x", spa_name(spa),
	gethrtime(), error);
	}
	mutex_exit(&mmp->mmp_io_lock);
	spa_config_exit(spa, SCL_STATE, mmp_tag);
	return;
	}

	vd = spa->spa_mmp.mmp_last_leaf;
	if (mmp->mmp_skip_error != 0) {
	mmp->mmp_skip_error = 0;
	zfs_dbgmsg("MMP write after skipping due to unavailable "
	"leaves, pool '%s' gethrtime %llu leaf %llu",
	spa_name(spa), (u_longlong_t)gethrtime(),
	(u_longlong_t)vd->vdev_guid);
	}

	if (mmp->mmp_zio_root == NULL)
	mmp->mmp_zio_root = zio_root(spa, NULL, NULL,
	flags \| ZIO_FLAG_GODFATHER);

	if (mmp->mmp_ub.ub_timestamp != gethrestime_sec()) {
	/*
	* Want to reset mmp_seq when timestamp advances because after
	* an mmp_seq wrap new values will not be chosen by
	* uberblock_compare() as the "best".
	*/
	mmp->mmp_ub.ub_timestamp = gethrestime_sec();
	mmp->mmp_seq = 1;
	}

	ub = &mmp->mmp_ub;
	ub->ub_mmp_magic = MMP_MAGIC;
	ub->ub_mmp_delay = mmp->mmp_delay;
	ub->ub_mmp_config = MMP_SEQ_SET(mmp->mmp_seq) \|
	MMP_INTERVAL_SET(MMP_INTERVAL_OK(zfs_multihost_interval)) \|
	MMP_FAIL_INT_SET(MMP_FAIL_INTVS_OK(
	zfs_multihost_fail_intervals));
	vd->vdev_mmp_pending = gethrtime();
	vd->vdev_mmp_kstat_id = mmp->mmp_kstat_id;

	zio_t *zio = zio_null(mmp->mmp_zio_root, spa, NULL, NULL, NULL, flags);
	abd_t *ub_abd = abd_alloc_for_io(VDEV_UBERBLOCK_SIZE(vd), B_TRUE);
	abd_zero(ub_abd, VDEV_UBERBLOCK_SIZE(vd));
	abd_copy_from_buf(ub_abd, ub, sizeof (uberblock_t));

	mmp->mmp_seq++;
	mmp->mmp_kstat_id++;
	mutex_exit(&mmp->mmp_io_lock);

	offset = VDEV_UBERBLOCK_OFFSET(vd, VDEV_UBERBLOCK_COUNT(vd) -
	- MMP_BLOCKS_PER_LABEL + spa_get_random(MMP_BLOCKS_PER_LABEL));
	+ MMP_BLOCKS_PER_LABEL + random_in_range(MMP_BLOCKS_PER_LABEL));

	- label = spa_get_random(VDEV_LABELS);
	+ label = random_in_range(VDEV_LABELS);
	vdev_label_write(zio, vd, label, ub_abd, offset,
	VDEV_UBERBLOCK_SIZE(vd), mmp_write_done, mmp,
	flags \| ZIO_FLAG_DONT_PROPAGATE);

	(void) spa_mmp_history_add(spa, ub->ub_txg, ub->ub_timestamp,
	ub->ub_mmp_delay, vd, label, vd->vdev_mmp_kstat_id, 0);

	zio_nowait(zio);
	}

	static void
	mmp_thread(void *arg)
	{
	spa_t spa = (spa_t )arg;
	mmp_thread_t *mmp = &spa->spa_mmp;
	boolean_t suspended = spa_suspended(spa);
	boolean_t multihost = spa_multihost(spa);
	uint64_t mmp_interval = MSEC2NSEC(MMP_INTERVAL_OK(
	zfs_multihost_interval));
	uint32_t mmp_fail_intervals = MMP_FAIL_INTVS_OK(
	zfs_multihost_fail_intervals);
	hrtime_t mmp_fail_ns = mmp_fail_intervals * mmp_interval;
	boolean_t last_spa_suspended = suspended;
	boolean_t last_spa_multihost = multihost;
	uint64_t last_mmp_interval = mmp_interval;
	uint32_t last_mmp_fail_intervals = mmp_fail_intervals;
	hrtime_t last_mmp_fail_ns = mmp_fail_ns;
	callb_cpr_t cpr;
	int skip_wait = 0;

	mmp_thread_enter(mmp, &cpr);

	/*
	* There have been no MMP writes yet. Setting mmp_last_write here gives
	* us one mmp_fail_ns period, which is consistent with the activity
	* check duration, to try to land an MMP write before MMP suspends the
	* pool (if so configured).
	*/

	mutex_enter(&mmp->mmp_io_lock);
	mmp->mmp_last_write = gethrtime();
	mmp->mmp_delay = MSEC2NSEC(MMP_INTERVAL_OK(zfs_multihost_interval));
	mutex_exit(&mmp->mmp_io_lock);

	while (!mmp->mmp_thread_exiting) {
	hrtime_t next_time = gethrtime() +
	MSEC2NSEC(MMP_DEFAULT_INTERVAL);
	int leaves = MAX(vdev_count_leaves(spa), 1);

	/* Detect changes in tunables or state */

	last_spa_suspended = suspended;
	last_spa_multihost = multihost;
	suspended = spa_suspended(spa);
	multihost = spa_multihost(spa);

	last_mmp_interval = mmp_interval;
	last_mmp_fail_intervals = mmp_fail_intervals;
	last_mmp_fail_ns = mmp_fail_ns;
	mmp_interval = MSEC2NSEC(MMP_INTERVAL_OK(
	zfs_multihost_interval));
	mmp_fail_intervals = MMP_FAIL_INTVS_OK(
	zfs_multihost_fail_intervals);

	/* Smooth so pool is not suspended when reducing tunables */
	if (mmp_fail_intervals * mmp_interval < mmp_fail_ns) {
	mmp_fail_ns = (mmp_fail_ns * 31 +
	mmp_fail_intervals * mmp_interval) / 32;
	} else {
	mmp_fail_ns = mmp_fail_intervals *
	mmp_interval;
	}

	if (mmp_interval != last_mmp_interval \|\|
	mmp_fail_intervals != last_mmp_fail_intervals) {
	/*
	* We want other hosts to see new tunables as quickly as
	* possible. Write out at higher frequency than usual.
	*/
	skip_wait += leaves;
	}

	if (multihost)
	next_time = gethrtime() + mmp_interval / leaves;

	if (mmp_fail_ns != last_mmp_fail_ns) {
	zfs_dbgmsg("MMP interval change pool '%s' "
	"gethrtime %llu last_mmp_interval %llu "
	"mmp_interval %llu last_mmp_fail_intervals %u "
	"mmp_fail_intervals %u mmp_fail_ns %llu "
	"skip_wait %d leaves %d next_time %llu",
	spa_name(spa), (u_longlong_t)gethrtime(),
	(u_longlong_t)last_mmp_interval,
	(u_longlong_t)mmp_interval, last_mmp_fail_intervals,
	mmp_fail_intervals, (u_longlong_t)mmp_fail_ns,
	skip_wait, leaves, (u_longlong_t)next_time);
	}

	/*
	* MMP off => on, or suspended => !suspended:
	* No writes occurred recently. Update mmp_last_write to give
	* us some time to try.
	*/
	if ((!last_spa_multihost && multihost) \|\|
	(last_spa_suspended && !suspended)) {
	zfs_dbgmsg("MMP state change pool '%s': gethrtime %llu "
	"last_spa_multihost %u multihost %u "
	"last_spa_suspended %u suspended %u",
	spa_name(spa), (u_longlong_t)gethrtime(),
	last_spa_multihost, multihost, last_spa_suspended,
	suspended);
	mutex_enter(&mmp->mmp_io_lock);
	mmp->mmp_last_write = gethrtime();
	mmp->mmp_delay = mmp_interval;
	mutex_exit(&mmp->mmp_io_lock);
	}

	/*
	* MMP on => off:
	* mmp_delay == 0 tells importing node to skip activity check.
	*/
	if (last_spa_multihost && !multihost) {
	mutex_enter(&mmp->mmp_io_lock);
	mmp->mmp_delay = 0;
	mutex_exit(&mmp->mmp_io_lock);
	}

	/*
	* Suspend the pool if no MMP write has succeeded in over
	* mmp_interval * mmp_fail_intervals nanoseconds.
	*/
	if (multihost && !suspended && mmp_fail_intervals &&
	(gethrtime() - mmp->mmp_last_write) > mmp_fail_ns) {
	zfs_dbgmsg("MMP suspending pool '%s': gethrtime %llu "
	"mmp_last_write %llu mmp_interval %llu "
	"mmp_fail_intervals %llu mmp_fail_ns %llu",
	spa_name(spa), (u_longlong_t)gethrtime(),
	(u_longlong_t)mmp->mmp_last_write,
	(u_longlong_t)mmp_interval,
	(u_longlong_t)mmp_fail_intervals,
	(u_longlong_t)mmp_fail_ns);
	cmn_err(CE_WARN, "MMP writes to pool '%s' have not "
	"succeeded in over %llu ms; suspending pool. "
	"Hrtime %llu",
	spa_name(spa),
	NSEC2MSEC(gethrtime() - mmp->mmp_last_write),
	gethrtime());
	zio_suspend(spa, NULL, ZIO_SUSPEND_MMP);
	}

	if (multihost && !suspended)
	mmp_write_uberblock(spa);

	if (skip_wait > 0) {
	next_time = gethrtime() + MSEC2NSEC(MMP_MIN_INTERVAL) /
	leaves;
	skip_wait--;
	}

	CALLB_CPR_SAFE_BEGIN(&cpr);
	(void) cv_timedwait_idle_hires(&mmp->mmp_thread_cv,
	&mmp->mmp_thread_lock, next_time, USEC2NSEC(100),
	CALLOUT_FLAG_ABSOLUTE);
	CALLB_CPR_SAFE_END(&cpr, &mmp->mmp_thread_lock);
	}

	/* Outstanding writes are allowed to complete. */
	zio_wait(mmp->mmp_zio_root);

	mmp->mmp_zio_root = NULL;
	mmp_thread_exit(mmp, &mmp->mmp_thread, &cpr);
	}

	/*
	* Signal the MMP thread to wake it, when it is sleeping on
	* its cv. Used when some module parameter has changed and
	* we want the thread to know about it.
	* Only signal if the pool is active and mmp thread is
	* running, otherwise there is no thread to wake.
	*/
	static void
	mmp_signal_thread(spa_t *spa)
	{
	mmp_thread_t *mmp = &spa->spa_mmp;

	mutex_enter(&mmp->mmp_thread_lock);
	if (mmp->mmp_thread)
	cv_broadcast(&mmp->mmp_thread_cv);
	mutex_exit(&mmp->mmp_thread_lock);
	}

	void
	mmp_signal_all_threads(void)
	{
	spa_t *spa = NULL;

	mutex_enter(&spa_namespace_lock);
	while ((spa = spa_next(spa))) {
	if (spa->spa_state == POOL_STATE_ACTIVE)
	mmp_signal_thread(spa);
	}
	mutex_exit(&spa_namespace_lock);
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM_CALL(zfs_multihost, zfs_multihost_, interval,
	param_set_multihost_interval, param_get_ulong, ZMOD_RW,
	"Milliseconds between mmp writes to each leaf");
	/* END CSTYLED */

	ZFS_MODULE_PARAM(zfs_multihost, zfs_multihost_, fail_intervals, UINT, ZMOD_RW,
	"Max allowed period without a successful mmp write");

	ZFS_MODULE_PARAM(zfs_multihost, zfs_multihost_, import_intervals, UINT, ZMOD_RW,
	"Number of zfs_multihost_interval periods to wait for activity");
	diff --git a/sys/contrib/openzfs/module/zfs/multilist.c b/sys/contrib/openzfs/module/zfs/multilist.c
	index eeac73bd7adf..8bbc9b376ae0 100644
	--- a/sys/contrib/openzfs/module/zfs/multilist.c
	+++ b/sys/contrib/openzfs/module/zfs/multilist.c
	@@ -1,432 +1,429 @@
	/*
	* CDDL HEADER START
	*
	* This file and its contents are supplied under the terms of the
	* Common Development and Distribution License ("CDDL"), version 1.0.
	* You may only use this file in accordance with the terms of version
	* 1.0 of the CDDL.
	*
	* A full copy of the text of the CDDL should have accompanied this
	* source. A copy of the CDDL is also available via the Internet at
	* http://www.illumos.org/license/CDDL.
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2013, 2017 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/multilist.h>
	#include <sys/trace_zfs.h>

	-/* needed for spa_get_random() */
	-#include <sys/spa.h>
	-
	/*
	* This overrides the number of sublists in each multilist_t, which defaults
	* to the number of CPUs in the system (see multilist_create()).
	*/
	int zfs_multilist_num_sublists = 0;

	/*
	* Given the object contained on the list, return a pointer to the
	* object's multilist_node_t structure it contains.
	*/
	#ifdef ZFS_DEBUG
	static multilist_node_t *
	multilist_d2l(multilist_t ml, void obj)
	{
	return ((multilist_node_t )((char )obj + ml->ml_offset));
	}
	#endif

	/*
	* Initialize a new mutlilist using the parameters specified.
	*
	* - 'size' denotes the size of the structure containing the
	* multilist_node_t.
	* - 'offset' denotes the byte offset of the mutlilist_node_t within
	* the structure that contains it.
	* - 'num' specifies the number of internal sublists to create.
	* - 'index_func' is used to determine which sublist to insert into
	* when the multilist_insert() function is called; as well as which
	* sublist to remove from when multilist_remove() is called. The
	* requirements this function must meet, are the following:
	*
	* - It must always return the same value when called on the same
	* object (to ensure the object is removed from the list it was
	* inserted into).
	*
	* - It must return a value in the range [0, number of sublists).
	* The multilist_get_num_sublists() function may be used to
	* determine the number of sublists in the multilist.
	*
	* Also, in order to reduce internal contention between the sublists
	* during insertion and removal, this function should choose evenly
	* between all available sublists when inserting. This isn't a hard
	* requirement, but a general rule of thumb in order to garner the
	* best multi-threaded performance out of the data structure.
	*/
	static void
	multilist_create_impl(multilist_t *ml, size_t size, size_t offset,
	unsigned int num, multilist_sublist_index_func_t *index_func)
	{
	ASSERT3U(size, >, 0);
	ASSERT3U(size, >=, offset + sizeof (multilist_node_t));
	ASSERT3U(num, >, 0);
	ASSERT3P(index_func, !=, NULL);

	ml->ml_offset = offset;
	ml->ml_num_sublists = num;
	ml->ml_index_func = index_func;

	ml->ml_sublists = kmem_zalloc(sizeof (multilist_sublist_t) *
	ml->ml_num_sublists, KM_SLEEP);

	ASSERT3P(ml->ml_sublists, !=, NULL);

	for (int i = 0; i < ml->ml_num_sublists; i++) {
	multilist_sublist_t *mls = &ml->ml_sublists[i];
	mutex_init(&mls->mls_lock, NULL, MUTEX_NOLOCKDEP, NULL);
	list_create(&mls->mls_list, size, offset);
	}
	}

	/*
	* Allocate a new multilist, using the default number of sublists (the number
	* of CPUs, or at least 4, or the tunable zfs_multilist_num_sublists). Note
	* that the multilists do not expand if more CPUs are hot-added. In that case,
	* we will have less fanout than boot_ncpus, but we don't want to always
	* reserve the RAM necessary to create the extra slots for additional CPUs up
	* front, and dynamically adding them is a complex task.
	*/
	void
	multilist_create(multilist_t *ml, size_t size, size_t offset,
	multilist_sublist_index_func_t *index_func)
	{
	int num_sublists;

	if (zfs_multilist_num_sublists > 0) {
	num_sublists = zfs_multilist_num_sublists;
	} else {
	num_sublists = MAX(boot_ncpus, 4);
	}

	multilist_create_impl(ml, size, offset, num_sublists, index_func);
	}

	/*
	* Destroy the given multilist object, and free up any memory it holds.
	*/
	void
	multilist_destroy(multilist_t *ml)
	{
	ASSERT(multilist_is_empty(ml));

	for (int i = 0; i < ml->ml_num_sublists; i++) {
	multilist_sublist_t *mls = &ml->ml_sublists[i];

	ASSERT(list_is_empty(&mls->mls_list));

	list_destroy(&mls->mls_list);
	mutex_destroy(&mls->mls_lock);
	}

	ASSERT3P(ml->ml_sublists, !=, NULL);
	kmem_free(ml->ml_sublists,
	sizeof (multilist_sublist_t) * ml->ml_num_sublists);

	ml->ml_num_sublists = 0;
	ml->ml_offset = 0;
	ml->ml_sublists = NULL;
	}

	/*
	* Insert the given object into the multilist.
	*
	* This function will insert the object specified into the sublist
	* determined using the function given at multilist creation time.
	*
	* The sublist locks are automatically acquired if not already held, to
	* ensure consistency when inserting and removing from multiple threads.
	*/
	void
	multilist_insert(multilist_t ml, void obj)
	{
	unsigned int sublist_idx = ml->ml_index_func(ml, obj);
	multilist_sublist_t *mls;
	boolean_t need_lock;

	DTRACE_PROBE3(multilist__insert, multilist_t *, ml,
	unsigned int, sublist_idx, void *, obj);

	ASSERT3U(sublist_idx, <, ml->ml_num_sublists);

	mls = &ml->ml_sublists[sublist_idx];

	/*
	* Note: Callers may already hold the sublist lock by calling
	* multilist_sublist_lock(). Here we rely on MUTEX_HELD()
	* returning TRUE if and only if the current thread holds the
	* lock. While it's a little ugly to make the lock recursive in
	* this way, it works and allows the calling code to be much
	* simpler -- otherwise it would have to pass around a flag
	* indicating that it already has the lock.
	*/
	need_lock = !MUTEX_HELD(&mls->mls_lock);

	if (need_lock)
	mutex_enter(&mls->mls_lock);

	ASSERT(!multilist_link_active(multilist_d2l(ml, obj)));

	multilist_sublist_insert_head(mls, obj);

	if (need_lock)
	mutex_exit(&mls->mls_lock);
	}

	/*
	* Remove the given object from the multilist.
	*
	* This function will remove the object specified from the sublist
	* determined using the function given at multilist creation time.
	*
	* The necessary sublist locks are automatically acquired, to ensure
	* consistency when inserting and removing from multiple threads.
	*/
	void
	multilist_remove(multilist_t ml, void obj)
	{
	unsigned int sublist_idx = ml->ml_index_func(ml, obj);
	multilist_sublist_t *mls;
	boolean_t need_lock;

	DTRACE_PROBE3(multilist__remove, multilist_t *, ml,
	unsigned int, sublist_idx, void *, obj);

	ASSERT3U(sublist_idx, <, ml->ml_num_sublists);

	mls = &ml->ml_sublists[sublist_idx];
	/* See comment in multilist_insert(). */
	need_lock = !MUTEX_HELD(&mls->mls_lock);

	if (need_lock)
	mutex_enter(&mls->mls_lock);

	ASSERT(multilist_link_active(multilist_d2l(ml, obj)));

	multilist_sublist_remove(mls, obj);

	if (need_lock)
	mutex_exit(&mls->mls_lock);
	}

	/*
	* Check to see if this multilist object is empty.
	*
	* This will return TRUE if it finds all of the sublists of this
	* multilist to be empty, and FALSE otherwise. Each sublist lock will be
	* automatically acquired as necessary.
	*
	* If concurrent insertions and removals are occurring, the semantics
	* of this function become a little fuzzy. Instead of locking all
	* sublists for the entire call time of the function, each sublist is
	* only locked as it is individually checked for emptiness. Thus, it's
	* possible for this function to return TRUE with non-empty sublists at
	* the time the function returns. This would be due to another thread
	* inserting into a given sublist, after that specific sublist was check
	* and deemed empty, but before all sublists have been checked.
	*/
	int
	multilist_is_empty(multilist_t *ml)
	{
	for (int i = 0; i < ml->ml_num_sublists; i++) {
	multilist_sublist_t *mls = &ml->ml_sublists[i];
	/* See comment in multilist_insert(). */
	boolean_t need_lock = !MUTEX_HELD(&mls->mls_lock);

	if (need_lock)
	mutex_enter(&mls->mls_lock);

	if (!list_is_empty(&mls->mls_list)) {
	if (need_lock)
	mutex_exit(&mls->mls_lock);

	return (FALSE);
	}

	if (need_lock)
	mutex_exit(&mls->mls_lock);
	}

	return (TRUE);
	}

	/* Return the number of sublists composing this multilist */
	unsigned int
	multilist_get_num_sublists(multilist_t *ml)
	{
	return (ml->ml_num_sublists);
	}

	/* Return a randomly selected, valid sublist index for this multilist */
	unsigned int
	multilist_get_random_index(multilist_t *ml)
	{
	- return (spa_get_random(ml->ml_num_sublists));
	+ return (random_in_range(ml->ml_num_sublists));
	}

	/* Lock and return the sublist specified at the given index */
	multilist_sublist_t *
	multilist_sublist_lock(multilist_t *ml, unsigned int sublist_idx)
	{
	multilist_sublist_t *mls;

	ASSERT3U(sublist_idx, <, ml->ml_num_sublists);
	mls = &ml->ml_sublists[sublist_idx];
	mutex_enter(&mls->mls_lock);

	return (mls);
	}

	/* Lock and return the sublist that would be used to store the specified obj */
	multilist_sublist_t *
	multilist_sublist_lock_obj(multilist_t ml, void obj)
	{
	return (multilist_sublist_lock(ml, ml->ml_index_func(ml, obj)));
	}

	void
	multilist_sublist_unlock(multilist_sublist_t *mls)
	{
	mutex_exit(&mls->mls_lock);
	}

	/*
	* We're allowing any object to be inserted into this specific sublist,
	* but this can lead to trouble if multilist_remove() is called to
	* remove this object. Specifically, if calling ml_index_func on this
	* object returns an index for sublist different than what is passed as
	* a parameter here, any call to multilist_remove() with this newly
	* inserted object is undefined! (the call to multilist_remove() will
	* remove the object from a list that it isn't contained in)
	*/
	void
	multilist_sublist_insert_head(multilist_sublist_t mls, void obj)
	{
	ASSERT(MUTEX_HELD(&mls->mls_lock));
	list_insert_head(&mls->mls_list, obj);
	}

	/* please see comment above multilist_sublist_insert_head */
	void
	multilist_sublist_insert_tail(multilist_sublist_t mls, void obj)
	{
	ASSERT(MUTEX_HELD(&mls->mls_lock));
	list_insert_tail(&mls->mls_list, obj);
	}

	/*
	* Move the object one element forward in the list.
	*
	* This function will move the given object forward in the list (towards
	* the head) by one object. So, in essence, it will swap its position in
	* the list with its "prev" pointer. If the given object is already at the
	* head of the list, it cannot be moved forward any more than it already
	* is, so no action is taken.
	*
	* NOTE: This function must not remove any object from the list other
	* than the object given as the parameter. This is relied upon in
	* arc_evict_state_impl().
	*/
	void
	multilist_sublist_move_forward(multilist_sublist_t mls, void obj)
	{
	void *prev = list_prev(&mls->mls_list, obj);

	ASSERT(MUTEX_HELD(&mls->mls_lock));
	ASSERT(!list_is_empty(&mls->mls_list));

	/* 'obj' must be at the head of the list, nothing to do */
	if (prev == NULL)
	return;

	list_remove(&mls->mls_list, obj);
	list_insert_before(&mls->mls_list, prev, obj);
	}

	void
	multilist_sublist_remove(multilist_sublist_t mls, void obj)
	{
	ASSERT(MUTEX_HELD(&mls->mls_lock));
	list_remove(&mls->mls_list, obj);
	}

	int
	multilist_sublist_is_empty(multilist_sublist_t *mls)
	{
	ASSERT(MUTEX_HELD(&mls->mls_lock));
	return (list_is_empty(&mls->mls_list));
	}

	int
	multilist_sublist_is_empty_idx(multilist_t *ml, unsigned int sublist_idx)
	{
	multilist_sublist_t *mls;
	int empty;

	ASSERT3U(sublist_idx, <, ml->ml_num_sublists);
	mls = &ml->ml_sublists[sublist_idx];
	ASSERT(!MUTEX_HELD(&mls->mls_lock));
	mutex_enter(&mls->mls_lock);
	empty = list_is_empty(&mls->mls_list);
	mutex_exit(&mls->mls_lock);
	return (empty);
	}

	void *
	multilist_sublist_head(multilist_sublist_t *mls)
	{
	ASSERT(MUTEX_HELD(&mls->mls_lock));
	return (list_head(&mls->mls_list));
	}

	void *
	multilist_sublist_tail(multilist_sublist_t *mls)
	{
	ASSERT(MUTEX_HELD(&mls->mls_lock));
	return (list_tail(&mls->mls_list));
	}

	void *
	multilist_sublist_next(multilist_sublist_t mls, void obj)
	{
	ASSERT(MUTEX_HELD(&mls->mls_lock));
	return (list_next(&mls->mls_list, obj));
	}

	void *
	multilist_sublist_prev(multilist_sublist_t mls, void obj)
	{
	ASSERT(MUTEX_HELD(&mls->mls_lock));
	return (list_prev(&mls->mls_list, obj));
	}

	void
	multilist_link_init(multilist_node_t *link)
	{
	list_link_init(link);
	}

	int
	multilist_link_active(multilist_node_t *link)
	{
	return (list_link_active(link));
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs, zfs_, multilist_num_sublists, INT, ZMOD_RW,
	"Number of sublists used in each multilist");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/refcount.c b/sys/contrib/openzfs/module/zfs/refcount.c
	index a3877b8d15f6..354e021d9d26 100644
	--- a/sys/contrib/openzfs/module/zfs/refcount.c
	+++ b/sys/contrib/openzfs/module/zfs/refcount.c
	@@ -1,335 +1,328 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2021 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/zfs_refcount.h>

	/*
	* Reference count tracking is disabled by default. It's memory requirements
	* are reasonable, however as implemented it consumes a significant amount of
	* cpu time. Until its performance is improved it should be manually enabled.
	*/
	int reference_tracking_enable = FALSE;
	int reference_history = 3; /* tunable */

	#ifdef ZFS_DEBUG
	static kmem_cache_t *reference_cache;
	static kmem_cache_t *reference_history_cache;

	void
	zfs_refcount_init(void)
	{
	reference_cache = kmem_cache_create("reference_cache",
	sizeof (reference_t), 0, NULL, NULL, NULL, NULL, NULL, 0);

	reference_history_cache = kmem_cache_create("reference_history_cache",
	sizeof (uint64_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
	}

	void
	zfs_refcount_fini(void)
	{
	kmem_cache_destroy(reference_cache);
	kmem_cache_destroy(reference_history_cache);
	}

	void
	zfs_refcount_create(zfs_refcount_t *rc)
	{
	mutex_init(&rc->rc_mtx, NULL, MUTEX_DEFAULT, NULL);
	list_create(&rc->rc_list, sizeof (reference_t),
	offsetof(reference_t, ref_link));
	list_create(&rc->rc_removed, sizeof (reference_t),
	offsetof(reference_t, ref_link));
	rc->rc_count = 0;
	rc->rc_removed_count = 0;
	rc->rc_tracked = reference_tracking_enable;
	}

	void
	zfs_refcount_create_tracked(zfs_refcount_t *rc)
	{
	zfs_refcount_create(rc);
	rc->rc_tracked = B_TRUE;
	}

	void
	zfs_refcount_create_untracked(zfs_refcount_t *rc)
	{
	zfs_refcount_create(rc);
	rc->rc_tracked = B_FALSE;
	}

	void
	zfs_refcount_destroy_many(zfs_refcount_t *rc, uint64_t number)
	{
	reference_t *ref;

	ASSERT3U(rc->rc_count, ==, number);
	while ((ref = list_head(&rc->rc_list))) {
	list_remove(&rc->rc_list, ref);
	kmem_cache_free(reference_cache, ref);
	}
	list_destroy(&rc->rc_list);

	while ((ref = list_head(&rc->rc_removed))) {
	list_remove(&rc->rc_removed, ref);
	kmem_cache_free(reference_history_cache, ref->ref_removed);
	kmem_cache_free(reference_cache, ref);
	}
	list_destroy(&rc->rc_removed);
	mutex_destroy(&rc->rc_mtx);
	}

	void
	zfs_refcount_destroy(zfs_refcount_t *rc)
	{
	zfs_refcount_destroy_many(rc, 0);
	}

	int
	zfs_refcount_is_zero(zfs_refcount_t *rc)
	{
	- return (rc->rc_count == 0);
	+ return (zfs_refcount_count(rc) == 0);
	}

	int64_t
	zfs_refcount_count(zfs_refcount_t *rc)
	{
	- return (rc->rc_count);
	+ return (atomic_load_64(&rc->rc_count));
	}

	int64_t
	zfs_refcount_add_many(zfs_refcount_t rc, uint64_t number, const void holder)
	{
	reference_t *ref = NULL;
	int64_t count;

	- if (rc->rc_tracked) {
	- ref = kmem_cache_alloc(reference_cache, KM_SLEEP);
	- ref->ref_holder = holder;
	- ref->ref_number = number;
	+ if (!rc->rc_tracked) {
	+ count = atomic_add_64_nv(&(rc)->rc_count, number);
	+ ASSERT3U(count, >=, number);
	+ return (count);
	}
	+
	+ ref = kmem_cache_alloc(reference_cache, KM_SLEEP);
	+ ref->ref_holder = holder;
	+ ref->ref_number = number;
	mutex_enter(&rc->rc_mtx);
	ASSERT3U(rc->rc_count, >=, 0);
	- if (rc->rc_tracked)
	- list_insert_head(&rc->rc_list, ref);
	+ list_insert_head(&rc->rc_list, ref);
	rc->rc_count += number;
	count = rc->rc_count;
	mutex_exit(&rc->rc_mtx);

	return (count);
	}

	int64_t
	zfs_refcount_add(zfs_refcount_t rc, const void holder)
	{
	return (zfs_refcount_add_many(rc, 1, holder));
	}

	int64_t
	zfs_refcount_remove_many(zfs_refcount_t *rc, uint64_t number,
	const void *holder)
	{
	reference_t *ref;
	int64_t count;

	- mutex_enter(&rc->rc_mtx);
	- ASSERT3U(rc->rc_count, >=, number);
	-
	if (!rc->rc_tracked) {
	- rc->rc_count -= number;
	- count = rc->rc_count;
	- mutex_exit(&rc->rc_mtx);
	+ count = atomic_add_64_nv(&(rc)->rc_count, -number);
	+ ASSERT3S(count, >=, 0);
	return (count);
	}

	+ mutex_enter(&rc->rc_mtx);
	+ ASSERT3U(rc->rc_count, >=, number);
	for (ref = list_head(&rc->rc_list); ref;
	ref = list_next(&rc->rc_list, ref)) {
	if (ref->ref_holder == holder && ref->ref_number == number) {
	list_remove(&rc->rc_list, ref);
	if (reference_history > 0) {
	ref->ref_removed =
	kmem_cache_alloc(reference_history_cache,
	KM_SLEEP);
	list_insert_head(&rc->rc_removed, ref);
	rc->rc_removed_count++;
	if (rc->rc_removed_count > reference_history) {
	ref = list_tail(&rc->rc_removed);
	list_remove(&rc->rc_removed, ref);
	kmem_cache_free(reference_history_cache,
	ref->ref_removed);
	kmem_cache_free(reference_cache, ref);
	rc->rc_removed_count--;
	}
	} else {
	kmem_cache_free(reference_cache, ref);
	}
	rc->rc_count -= number;
	count = rc->rc_count;
	mutex_exit(&rc->rc_mtx);
	return (count);
	}
	}
	panic("No such hold %p on refcount %llx", holder,
	(u_longlong_t)(uintptr_t)rc);
	return (-1);
	}

	int64_t
	zfs_refcount_remove(zfs_refcount_t rc, const void holder)
	{
	return (zfs_refcount_remove_many(rc, 1, holder));
	}

	void
	zfs_refcount_transfer(zfs_refcount_t dst, zfs_refcount_t src)
	{
	int64_t count, removed_count;
	list_t list, removed;

	list_create(&list, sizeof (reference_t),
	offsetof(reference_t, ref_link));
	list_create(&removed, sizeof (reference_t),
	offsetof(reference_t, ref_link));

	mutex_enter(&src->rc_mtx);
	count = src->rc_count;
	removed_count = src->rc_removed_count;
	src->rc_count = 0;
	src->rc_removed_count = 0;
	list_move_tail(&list, &src->rc_list);
	list_move_tail(&removed, &src->rc_removed);
	mutex_exit(&src->rc_mtx);

	mutex_enter(&dst->rc_mtx);
	dst->rc_count += count;
	dst->rc_removed_count += removed_count;
	list_move_tail(&dst->rc_list, &list);
	list_move_tail(&dst->rc_removed, &removed);
	mutex_exit(&dst->rc_mtx);

	list_destroy(&list);
	list_destroy(&removed);
	}

	void
	zfs_refcount_transfer_ownership_many(zfs_refcount_t *rc, uint64_t number,
	const void current_holder, const void new_holder)
	{
	reference_t *ref;
	boolean_t found = B_FALSE;

	- mutex_enter(&rc->rc_mtx);
	- if (!rc->rc_tracked) {
	- mutex_exit(&rc->rc_mtx);
	+ if (!rc->rc_tracked)
	return;
	- }

	+ mutex_enter(&rc->rc_mtx);
	for (ref = list_head(&rc->rc_list); ref;
	ref = list_next(&rc->rc_list, ref)) {
	if (ref->ref_holder == current_holder &&
	ref->ref_number == number) {
	ref->ref_holder = new_holder;
	found = B_TRUE;
	break;
	}
	}
	ASSERT(found);
	mutex_exit(&rc->rc_mtx);
	}

	void
	zfs_refcount_transfer_ownership(zfs_refcount_t rc, const void current_holder,
	const void *new_holder)
	{
	return (zfs_refcount_transfer_ownership_many(rc, 1, current_holder,
	new_holder));
	}

	/*
	* If tracking is enabled, return true if a reference exists that matches
	* the "holder" tag. If tracking is disabled, then return true if a reference
	* might be held.
	*/
	boolean_t
	zfs_refcount_held(zfs_refcount_t rc, const void holder)
	{
	reference_t *ref;

	- mutex_enter(&rc->rc_mtx);
	-
	- if (!rc->rc_tracked) {
	- mutex_exit(&rc->rc_mtx);
	- return (rc->rc_count > 0);
	- }
	+ if (!rc->rc_tracked)
	+ return (zfs_refcount_count(rc) > 0);

	+ mutex_enter(&rc->rc_mtx);
	for (ref = list_head(&rc->rc_list); ref;
	ref = list_next(&rc->rc_list, ref)) {
	if (ref->ref_holder == holder) {
	mutex_exit(&rc->rc_mtx);
	return (B_TRUE);
	}
	}
	mutex_exit(&rc->rc_mtx);
	return (B_FALSE);
	}

	/*
	* If tracking is enabled, return true if a reference does not exist that
	* matches the "holder" tag. If tracking is disabled, always return true
	* since the reference might not be held.
	*/
	boolean_t
	zfs_refcount_not_held(zfs_refcount_t rc, const void holder)
	{
	reference_t *ref;

	- mutex_enter(&rc->rc_mtx);
	-
	- if (!rc->rc_tracked) {
	- mutex_exit(&rc->rc_mtx);
	+ if (!rc->rc_tracked)
	return (B_TRUE);
	- }

	+ mutex_enter(&rc->rc_mtx);
	for (ref = list_head(&rc->rc_list); ref;
	ref = list_next(&rc->rc_list, ref)) {
	if (ref->ref_holder == holder) {
	mutex_exit(&rc->rc_mtx);
	return (B_FALSE);
	}
	}
	mutex_exit(&rc->rc_mtx);
	return (B_TRUE);
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs, ,reference_tracking_enable, INT, ZMOD_RW,
	"Track reference holders to refcount_t objects");

	ZFS_MODULE_PARAM(zfs, ,reference_history, INT, ZMOD_RW,
	"Maximum reference holders being tracked");
	/* END CSTYLED */
	#endif /* ZFS_DEBUG */
	diff --git a/sys/contrib/openzfs/module/zfs/spa.c b/sys/contrib/openzfs/module/zfs/spa.c
	index bacd04fc0e39..55870bee47fb 100644
	--- a/sys/contrib/openzfs/module/zfs/spa.c
	+++ b/sys/contrib/openzfs/module/zfs/spa.c
	@@ -1,9950 +1,9951 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2018, Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	* Copyright 2013 Saso Kiselkov. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	* Copyright 2016 Toomas Soome <tsoome@me.com>
	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	* Copyright 2018 Joyent, Inc.
	* Copyright (c) 2017, 2019, Datto Inc. All rights reserved.
	* Copyright 2017 Joyent, Inc.
	* Copyright (c) 2017, Intel Corporation.
	* Copyright (c) 2021, Colm Buckley <colm@tuatha.org>
	*/

	/*
	* SPA: Storage Pool Allocator
	*
	* This file contains all the routines used when modifying on-disk SPA state.
	* This includes opening, importing, destroying, exporting a pool, and syncing a
	* pool.
	*/

	#include <sys/zfs_context.h>
	#include <sys/fm/fs/zfs.h>
	#include <sys/spa_impl.h>
	#include <sys/zio.h>
	#include <sys/zio_checksum.h>
	#include <sys/dmu.h>
	#include <sys/dmu_tx.h>
	#include <sys/zap.h>
	#include <sys/zil.h>
	#include <sys/ddt.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_removal.h>
	#include <sys/vdev_indirect_mapping.h>
	#include <sys/vdev_indirect_births.h>
	#include <sys/vdev_initialize.h>
	#include <sys/vdev_rebuild.h>
	#include <sys/vdev_trim.h>
	#include <sys/vdev_disk.h>
	#include <sys/vdev_draid.h>
	#include <sys/metaslab.h>
	#include <sys/metaslab_impl.h>
	#include <sys/mmp.h>
	#include <sys/uberblock_impl.h>
	#include <sys/txg.h>
	#include <sys/avl.h>
	#include <sys/bpobj.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dmu_objset.h>
	#include <sys/unique.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_synctask.h>
	#include <sys/fs/zfs.h>
	#include <sys/arc.h>
	#include <sys/callb.h>
	#include <sys/systeminfo.h>
	#include <sys/spa_boot.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/dsl_scan.h>
	#include <sys/zfeature.h>
	#include <sys/dsl_destroy.h>
	#include <sys/zvol.h>

	#ifdef _KERNEL
	#include <sys/fm/protocol.h>
	#include <sys/fm/util.h>
	#include <sys/callb.h>
	#include <sys/zone.h>
	#include <sys/vmsystm.h>
	#endif /* _KERNEL */

	#include "zfs_prop.h"
	#include "zfs_comutil.h"

	/*
	* The interval, in seconds, at which failed configuration cache file writes
	* should be retried.
	*/
	int zfs_ccw_retry_interval = 300;

	typedef enum zti_modes {
	ZTI_MODE_FIXED, /* value is # of threads (min 1) */
	ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */
	ZTI_MODE_SCALE, /* Taskqs scale with CPUs. */
	ZTI_MODE_NULL, /* don't create a taskq */
	ZTI_NMODES
	} zti_modes_t;

	#define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) }
	#define ZTI_PCT(n) { ZTI_MODE_ONLINE_PERCENT, (n), 1 }
	#define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 }
	#define ZTI_SCALE { ZTI_MODE_SCALE, 0, 1 }
	#define ZTI_NULL { ZTI_MODE_NULL, 0, 0 }

	#define ZTI_N(n) ZTI_P(n, 1)
	#define ZTI_ONE ZTI_N(1)

	typedef struct zio_taskq_info {
	zti_modes_t zti_mode;
	uint_t zti_value;
	uint_t zti_count;
	} zio_taskq_info_t;

	static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = {
	"iss", "iss_h", "int", "int_h"
	};

	/*
	* This table defines the taskq settings for each ZFS I/O type. When
	* initializing a pool, we use this table to create an appropriately sized
	* taskq. Some operations are low volume and therefore have a small, static
	* number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE
	* macros. Other operations process a large amount of data; the ZTI_BATCH
	* macro causes us to create a taskq oriented for throughput. Some operations
	* are so high frequency and short-lived that the taskq itself can become a
	* point of lock contention. The ZTI_P(#, #) macro indicates that we need an
	* additional degree of parallelism specified by the number of threads per-
	* taskq and the number of taskqs; when dispatching an event in this case, the
	* particular taskq is chosen at random. ZTI_SCALE is similar to ZTI_BATCH,
	* but with number of taskqs also scaling with number of CPUs.
	*
	* The different taskq priorities are to handle the different contexts (issue
	* and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that
	* need to be handled with minimum delay.
	*/
	const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = {
	/* ISSUE ISSUE_HIGH INTR INTR_HIGH */
	{ ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */
	{ ZTI_N(8), ZTI_NULL, ZTI_SCALE, ZTI_NULL }, /* READ */
	{ ZTI_BATCH, ZTI_N(5), ZTI_SCALE, ZTI_N(5) }, /* WRITE */
	{ ZTI_SCALE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */
	{ ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */
	{ ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */
	{ ZTI_N(4), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* TRIM */
	};

	static void spa_sync_version(void arg, dmu_tx_t tx);
	static void spa_sync_props(void arg, dmu_tx_t tx);
	static boolean_t spa_has_active_shared_spare(spa_t *spa);
	static int spa_load_impl(spa_t spa, spa_import_type_t type, char *ereport);
	static void spa_vdev_resilver_done(spa_t *spa);

	uint_t zio_taskq_batch_pct = 80; /* 1 thread per cpu in pset */
	uint_t zio_taskq_batch_tpq; /* threads per taskq */
	boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */
	uint_t zio_taskq_basedc = 80; /* base duty cycle */

	boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */

	/*
	* Report any spa_load_verify errors found, but do not fail spa_load.
	* This is used by zdb to analyze non-idle pools.
	*/
	boolean_t spa_load_verify_dryrun = B_FALSE;

	/*
	* This (illegal) pool name is used when temporarily importing a spa_t in order
	* to get the vdev stats associated with the imported devices.
	*/
	#define TRYIMPORT_NAME "$import"

	/*
	* For debugging purposes: print out vdev tree during pool import.
	*/
	int spa_load_print_vdev_tree = B_FALSE;

	/*
	* A non-zero value for zfs_max_missing_tvds means that we allow importing
	* pools with missing top-level vdevs. This is strictly intended for advanced
	* pool recovery cases since missing data is almost inevitable. Pools with
	* missing devices can only be imported read-only for safety reasons, and their
	* fail-mode will be automatically set to "continue".
	*
	* With 1 missing vdev we should be able to import the pool and mount all
	* datasets. User data that was not modified after the missing device has been
	* added should be recoverable. This means that snapshots created prior to the
	* addition of that device should be completely intact.
	*
	* With 2 missing vdevs, some datasets may fail to mount since there are
	* dataset statistics that are stored as regular metadata. Some data might be
	* recoverable if those vdevs were added recently.
	*
	* With 3 or more missing vdevs, the pool is severely damaged and MOS entries
	* may be missing entirely. Chances of data recovery are very low. Note that
	* there are also risks of performing an inadvertent rewind as we might be
	* missing all the vdevs with the latest uberblocks.
	*/
	unsigned long zfs_max_missing_tvds = 0;

	/*
	* The parameters below are similar to zfs_max_missing_tvds but are only
	* intended for a preliminary open of the pool with an untrusted config which
	* might be incomplete or out-dated.
	*
	* We are more tolerant for pools opened from a cachefile since we could have
	* an out-dated cachefile where a device removal was not registered.
	* We could have set the limit arbitrarily high but in the case where devices
	* are really missing we would want to return the proper error codes; we chose
	* SPA_DVAS_PER_BP - 1 so that some copies of the MOS would still be available
	* and we get a chance to retrieve the trusted config.
	*/
	uint64_t zfs_max_missing_tvds_cachefile = SPA_DVAS_PER_BP - 1;

	/*
	* In the case where config was assembled by scanning device paths (/dev/dsks
	* by default) we are less tolerant since all the existing devices should have
	* been detected and we want spa_load to return the right error codes.
	*/
	uint64_t zfs_max_missing_tvds_scan = 0;

	/*
	* Debugging aid that pauses spa_sync() towards the end.
	*/
	boolean_t zfs_pause_spa_sync = B_FALSE;

	/*
	* Variables to indicate the livelist condense zthr func should wait at certain
	* points for the livelist to be removed - used to test condense/destroy races
	*/
	int zfs_livelist_condense_zthr_pause = 0;
	int zfs_livelist_condense_sync_pause = 0;

	/*
	* Variables to track whether or not condense cancellation has been
	* triggered in testing.
	*/
	int zfs_livelist_condense_sync_cancel = 0;
	int zfs_livelist_condense_zthr_cancel = 0;

	/*
	* Variable to track whether or not extra ALLOC blkptrs were added to a
	* livelist entry while it was being condensed (caused by the way we track
	* remapped blkptrs in dbuf_remap_impl)
	*/
	int zfs_livelist_condense_new_alloc = 0;

	/*
	* ==========================================================================
	* SPA properties routines
	* ==========================================================================
	*/

	/*
	* Add a (source=src, propname=propval) list to an nvlist.
	*/
	static void
	spa_prop_add_list(nvlist_t nvl, zpool_prop_t prop, char strval,
	uint64_t intval, zprop_source_t src)
	{
	const char *propname = zpool_prop_to_name(prop);
	nvlist_t *propval;

	VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
	VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0);

	if (strval != NULL)
	VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0);
	else
	VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0);

	VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0);
	nvlist_free(propval);
	}

	/*
	* Get property values from the spa configuration.
	*/
	static void
	spa_prop_get_config(spa_t spa, nvlist_t *nvp)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	dsl_pool_t *pool = spa->spa_dsl_pool;
	uint64_t size, alloc, cap, version;
	const zprop_source_t src = ZPROP_SRC_NONE;
	spa_config_dirent_t *dp;
	metaslab_class_t *mc = spa_normal_class(spa);

	ASSERT(MUTEX_HELD(&spa->spa_props_lock));

	if (rvd != NULL) {
	alloc = metaslab_class_get_alloc(mc);
	alloc += metaslab_class_get_alloc(spa_special_class(spa));
	alloc += metaslab_class_get_alloc(spa_dedup_class(spa));
	alloc += metaslab_class_get_alloc(spa_embedded_log_class(spa));

	size = metaslab_class_get_space(mc);
	size += metaslab_class_get_space(spa_special_class(spa));
	size += metaslab_class_get_space(spa_dedup_class(spa));
	size += metaslab_class_get_space(spa_embedded_log_class(spa));

	spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src);
	spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src);
	spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src);
	spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL,
	size - alloc, src);
	spa_prop_add_list(*nvp, ZPOOL_PROP_CHECKPOINT, NULL,
	spa->spa_checkpoint_info.sci_dspace, src);

	spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL,
	metaslab_class_fragmentation(mc), src);
	spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL,
	metaslab_class_expandable_space(mc), src);
	spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL,
	(spa_mode(spa) == SPA_MODE_READ), src);

	cap = (size == 0) ? 0 : (alloc * 100 / size);
	spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src);

	spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL,
	ddt_get_pool_dedup_ratio(spa), src);

	spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL,
	rvd->vdev_state, src);

	version = spa_version(spa);
	if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL,
	version, ZPROP_SRC_DEFAULT);
	} else {
	spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL,
	version, ZPROP_SRC_LOCAL);
	}
	spa_prop_add_list(*nvp, ZPOOL_PROP_LOAD_GUID,
	NULL, spa_load_guid(spa), src);
	}

	if (pool != NULL) {
	/*
	* The $FREE directory was introduced in SPA_VERSION_DEADLISTS,
	* when opening pools before this version freedir will be NULL.
	*/
	if (pool->dp_free_dir != NULL) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL,
	dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes,
	src);
	} else {
	spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING,
	NULL, 0, src);
	}

	if (pool->dp_leak_dir != NULL) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL,
	dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes,
	src);
	} else {
	spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED,
	NULL, 0, src);
	}
	}

	spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src);

	if (spa->spa_comment != NULL) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment,
	0, ZPROP_SRC_LOCAL);
	}

	if (spa->spa_compatibility != NULL) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_COMPATIBILITY,
	spa->spa_compatibility, 0, ZPROP_SRC_LOCAL);
	}

	if (spa->spa_root != NULL)
	spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root,
	0, ZPROP_SRC_LOCAL);

	if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL,
	MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE);
	} else {
	spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL,
	SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE);
	}

	if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_DNODE)) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_MAXDNODESIZE, NULL,
	DNODE_MAX_SIZE, ZPROP_SRC_NONE);
	} else {
	spa_prop_add_list(*nvp, ZPOOL_PROP_MAXDNODESIZE, NULL,
	DNODE_MIN_SIZE, ZPROP_SRC_NONE);
	}

	if ((dp = list_head(&spa->spa_config_list)) != NULL) {
	if (dp->scd_path == NULL) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE,
	"none", 0, ZPROP_SRC_LOCAL);
	} else if (strcmp(dp->scd_path, spa_config_path) != 0) {
	spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE,
	dp->scd_path, 0, ZPROP_SRC_LOCAL);
	}
	}
	}

	/*
	* Get zpool property values.
	*/
	int
	spa_prop_get(spa_t spa, nvlist_t *nvp)
	{
	objset_t *mos = spa->spa_meta_objset;
	zap_cursor_t zc;
	zap_attribute_t za;
	dsl_pool_t *dp;
	int err;

	err = nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP);
	if (err)
	return (err);

	dp = spa_get_dsl(spa);
	dsl_pool_config_enter(dp, FTAG);
	mutex_enter(&spa->spa_props_lock);

	/*
	* Get properties from the spa config.
	*/
	spa_prop_get_config(spa, nvp);

	/* If no pool property object, no more prop to get. */
	if (mos == NULL \|\| spa->spa_pool_props_object == 0)
	goto out;

	/*
	* Get properties from the MOS pool property object.
	*/
	for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object);
	(err = zap_cursor_retrieve(&zc, &za)) == 0;
	zap_cursor_advance(&zc)) {
	uint64_t intval = 0;
	char *strval = NULL;
	zprop_source_t src = ZPROP_SRC_DEFAULT;
	zpool_prop_t prop;

	if ((prop = zpool_name_to_prop(za.za_name)) == ZPOOL_PROP_INVAL)
	continue;

	switch (za.za_integer_length) {
	case 8:
	/* integer property */
	if (za.za_first_integer !=
	zpool_prop_default_numeric(prop))
	src = ZPROP_SRC_LOCAL;

	if (prop == ZPOOL_PROP_BOOTFS) {
	dsl_dataset_t *ds = NULL;

	err = dsl_dataset_hold_obj(dp,
	za.za_first_integer, FTAG, &ds);
	if (err != 0)
	break;

	strval = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN,
	KM_SLEEP);
	dsl_dataset_name(ds, strval);
	dsl_dataset_rele(ds, FTAG);
	} else {
	strval = NULL;
	intval = za.za_first_integer;
	}

	spa_prop_add_list(*nvp, prop, strval, intval, src);

	if (strval != NULL)
	kmem_free(strval, ZFS_MAX_DATASET_NAME_LEN);

	break;

	case 1:
	/* string property */
	strval = kmem_alloc(za.za_num_integers, KM_SLEEP);
	err = zap_lookup(mos, spa->spa_pool_props_object,
	za.za_name, 1, za.za_num_integers, strval);
	if (err) {
	kmem_free(strval, za.za_num_integers);
	break;
	}
	spa_prop_add_list(*nvp, prop, strval, 0, src);
	kmem_free(strval, za.za_num_integers);
	break;

	default:
	break;
	}
	}
	zap_cursor_fini(&zc);
	out:
	mutex_exit(&spa->spa_props_lock);
	dsl_pool_config_exit(dp, FTAG);
	if (err && err != ENOENT) {
	nvlist_free(*nvp);
	*nvp = NULL;
	return (err);
	}

	return (0);
	}

	/*
	* Validate the given pool properties nvlist and modify the list
	* for the property values to be set.
	*/
	static int
	spa_prop_validate(spa_t spa, nvlist_t props)
	{
	nvpair_t *elem;
	int error = 0, reset_bootfs = 0;
	uint64_t objnum = 0;
	boolean_t has_feature = B_FALSE;

	elem = NULL;
	while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
	uint64_t intval;
	char strval, slash, check, fname;
	const char *propname = nvpair_name(elem);
	zpool_prop_t prop = zpool_name_to_prop(propname);

	switch (prop) {
	case ZPOOL_PROP_INVAL:
	if (!zpool_prop_feature(propname)) {
	error = SET_ERROR(EINVAL);
	break;
	}

	/*
	* Sanitize the input.
	*/
	if (nvpair_type(elem) != DATA_TYPE_UINT64) {
	error = SET_ERROR(EINVAL);
	break;
	}

	if (nvpair_value_uint64(elem, &intval) != 0) {
	error = SET_ERROR(EINVAL);
	break;
	}

	if (intval != 0) {
	error = SET_ERROR(EINVAL);
	break;
	}

	fname = strchr(propname, '@') + 1;
	if (zfeature_lookup_name(fname, NULL) != 0) {
	error = SET_ERROR(EINVAL);
	break;
	}

	has_feature = B_TRUE;
	break;

	case ZPOOL_PROP_VERSION:
	error = nvpair_value_uint64(elem, &intval);
	if (!error &&
	(intval < spa_version(spa) \|\|
	intval > SPA_VERSION_BEFORE_FEATURES \|\|
	has_feature))
	error = SET_ERROR(EINVAL);
	break;

	case ZPOOL_PROP_DELEGATION:
	case ZPOOL_PROP_AUTOREPLACE:
	case ZPOOL_PROP_LISTSNAPS:
	case ZPOOL_PROP_AUTOEXPAND:
	case ZPOOL_PROP_AUTOTRIM:
	error = nvpair_value_uint64(elem, &intval);
	if (!error && intval > 1)
	error = SET_ERROR(EINVAL);
	break;

	case ZPOOL_PROP_MULTIHOST:
	error = nvpair_value_uint64(elem, &intval);
	if (!error && intval > 1)
	error = SET_ERROR(EINVAL);

	if (!error) {
	uint32_t hostid = zone_get_hostid(NULL);
	if (hostid)
	spa->spa_hostid = hostid;
	else
	error = SET_ERROR(ENOTSUP);
	}

	break;

	case ZPOOL_PROP_BOOTFS:
	/*
	* If the pool version is less than SPA_VERSION_BOOTFS,
	* or the pool is still being created (version == 0),
	* the bootfs property cannot be set.
	*/
	if (spa_version(spa) < SPA_VERSION_BOOTFS) {
	error = SET_ERROR(ENOTSUP);
	break;
	}

	/*
	* Make sure the vdev config is bootable
	*/
	if (!vdev_is_bootable(spa->spa_root_vdev)) {
	error = SET_ERROR(ENOTSUP);
	break;
	}

	reset_bootfs = 1;

	error = nvpair_value_string(elem, &strval);

	if (!error) {
	objset_t *os;

	if (strval == NULL \|\| strval[0] == '\0') {
	objnum = zpool_prop_default_numeric(
	ZPOOL_PROP_BOOTFS);
	break;
	}

	error = dmu_objset_hold(strval, FTAG, &os);
	if (error != 0)
	break;

	/* Must be ZPL. */
	if (dmu_objset_type(os) != DMU_OST_ZFS) {
	error = SET_ERROR(ENOTSUP);
	} else {
	objnum = dmu_objset_id(os);
	}
	dmu_objset_rele(os, FTAG);
	}
	break;

	case ZPOOL_PROP_FAILUREMODE:
	error = nvpair_value_uint64(elem, &intval);
	if (!error && intval > ZIO_FAILURE_MODE_PANIC)
	error = SET_ERROR(EINVAL);

	/*
	* This is a special case which only occurs when
	* the pool has completely failed. This allows
	* the user to change the in-core failmode property
	* without syncing it out to disk (I/Os might
	* currently be blocked). We do this by returning
	* EIO to the caller (spa_prop_set) to trick it
	* into thinking we encountered a property validation
	* error.
	*/
	if (!error && spa_suspended(spa)) {
	spa->spa_failmode = intval;
	error = SET_ERROR(EIO);
	}
	break;

	case ZPOOL_PROP_CACHEFILE:
	if ((error = nvpair_value_string(elem, &strval)) != 0)
	break;

	if (strval[0] == '\0')
	break;

	if (strcmp(strval, "none") == 0)
	break;

	if (strval[0] != '/') {
	error = SET_ERROR(EINVAL);
	break;
	}

	slash = strrchr(strval, '/');
	ASSERT(slash != NULL);

	if (slash[1] == '\0' \|\| strcmp(slash, "/.") == 0 \|\|
	strcmp(slash, "/..") == 0)
	error = SET_ERROR(EINVAL);
	break;

	case ZPOOL_PROP_COMMENT:
	if ((error = nvpair_value_string(elem, &strval)) != 0)
	break;
	for (check = strval; *check != '\0'; check++) {
	if (!isprint(*check)) {
	error = SET_ERROR(EINVAL);
	break;
	}
	}
	if (strlen(strval) > ZPROP_MAX_COMMENT)
	error = SET_ERROR(E2BIG);
	break;

	default:
	break;
	}

	if (error)
	break;
	}

	(void) nvlist_remove_all(props,
	zpool_prop_to_name(ZPOOL_PROP_DEDUPDITTO));

	if (!error && reset_bootfs) {
	error = nvlist_remove(props,
	zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING);

	if (!error) {
	error = nvlist_add_uint64(props,
	zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum);
	}
	}

	return (error);
	}

	void
	spa_configfile_set(spa_t spa, nvlist_t nvp, boolean_t need_sync)
	{
	char *cachefile;
	spa_config_dirent_t *dp;

	if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE),
	&cachefile) != 0)
	return;

	dp = kmem_alloc(sizeof (spa_config_dirent_t),
	KM_SLEEP);

	if (cachefile[0] == '\0')
	dp->scd_path = spa_strdup(spa_config_path);
	else if (strcmp(cachefile, "none") == 0)
	dp->scd_path = NULL;
	else
	dp->scd_path = spa_strdup(cachefile);

	list_insert_head(&spa->spa_config_list, dp);
	if (need_sync)
	spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
	}

	int
	spa_prop_set(spa_t spa, nvlist_t nvp)
	{
	int error;
	nvpair_t *elem = NULL;
	boolean_t need_sync = B_FALSE;

	if ((error = spa_prop_validate(spa, nvp)) != 0)
	return (error);

	while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) {
	zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem));

	if (prop == ZPOOL_PROP_CACHEFILE \|\|
	prop == ZPOOL_PROP_ALTROOT \|\|
	prop == ZPOOL_PROP_READONLY)
	continue;

	if (prop == ZPOOL_PROP_VERSION \|\| prop == ZPOOL_PROP_INVAL) {
	uint64_t ver;

	if (prop == ZPOOL_PROP_VERSION) {
	VERIFY(nvpair_value_uint64(elem, &ver) == 0);
	} else {
	ASSERT(zpool_prop_feature(nvpair_name(elem)));
	ver = SPA_VERSION_FEATURES;
	need_sync = B_TRUE;
	}

	/* Save time if the version is already set. */
	if (ver == spa_version(spa))
	continue;

	/*
	* In addition to the pool directory object, we might
	* create the pool properties object, the features for
	* read object, the features for write object, or the
	* feature descriptions object.
	*/
	error = dsl_sync_task(spa->spa_name, NULL,
	spa_sync_version, &ver,
	6, ZFS_SPACE_CHECK_RESERVED);
	if (error)
	return (error);
	continue;
	}

	need_sync = B_TRUE;
	break;
	}

	if (need_sync) {
	return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props,
	nvp, 6, ZFS_SPACE_CHECK_RESERVED));
	}

	return (0);
	}

	/*
	* If the bootfs property value is dsobj, clear it.
	*/
	void
	spa_prop_clear_bootfs(spa_t spa, uint64_t dsobj, dmu_tx_t tx)
	{
	if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) {
	VERIFY(zap_remove(spa->spa_meta_objset,
	spa->spa_pool_props_object,
	zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0);
	spa->spa_bootfs = 0;
	}
	}

	/ARGSUSED/
	static int
	spa_change_guid_check(void arg, dmu_tx_t tx)
	{
	uint64_t *newguid __maybe_unused = arg;
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	vdev_t *rvd = spa->spa_root_vdev;
	uint64_t vdev_state;

	if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) {
	int error = (spa_has_checkpoint(spa)) ?
	ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT;
	return (SET_ERROR(error));
	}

	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
	vdev_state = rvd->vdev_state;
	spa_config_exit(spa, SCL_STATE, FTAG);

	if (vdev_state != VDEV_STATE_HEALTHY)
	return (SET_ERROR(ENXIO));

	ASSERT3U(spa_guid(spa), !=, *newguid);

	return (0);
	}

	static void
	spa_change_guid_sync(void arg, dmu_tx_t tx)
	{
	uint64_t *newguid = arg;
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	uint64_t oldguid;
	vdev_t *rvd = spa->spa_root_vdev;

	oldguid = spa_guid(spa);

	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
	rvd->vdev_guid = *newguid;
	rvd->vdev_guid_sum += (*newguid - oldguid);
	vdev_config_dirty(rvd);
	spa_config_exit(spa, SCL_STATE, FTAG);

	spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu",
	(u_longlong_t)oldguid, (u_longlong_t)*newguid);
	}

	/*
	* Change the GUID for the pool. This is done so that we can later
	* re-import a pool built from a clone of our own vdevs. We will modify
	* the root vdev's guid, our own pool guid, and then mark all of our
	* vdevs dirty. Note that we must make sure that all our vdevs are
	* online when we do this, or else any vdevs that weren't present
	* would be orphaned from our pool. We are also going to issue a
	* sysevent to update any watchers.
	*/
	int
	spa_change_guid(spa_t *spa)
	{
	int error;
	uint64_t guid;

	mutex_enter(&spa->spa_vdev_top_lock);
	mutex_enter(&spa_namespace_lock);
	guid = spa_generate_guid(NULL);

	error = dsl_sync_task(spa->spa_name, spa_change_guid_check,
	spa_change_guid_sync, &guid, 5, ZFS_SPACE_CHECK_RESERVED);

	if (error == 0) {
	spa_write_cachefile(spa, B_FALSE, B_TRUE);
	spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_REGUID);
	}

	mutex_exit(&spa_namespace_lock);
	mutex_exit(&spa->spa_vdev_top_lock);

	return (error);
	}

	/*
	* ==========================================================================
	* SPA state manipulation (open/create/destroy/import/export)
	* ==========================================================================
	*/

	static int
	spa_error_entry_compare(const void a, const void b)
	{
	const spa_error_entry_t sa = (const spa_error_entry_t )a;
	const spa_error_entry_t sb = (const spa_error_entry_t )b;
	int ret;

	ret = memcmp(&sa->se_bookmark, &sb->se_bookmark,
	sizeof (zbookmark_phys_t));

	return (TREE_ISIGN(ret));
	}

	/*
	* Utility function which retrieves copies of the current logs and
	* re-initializes them in the process.
	*/
	void
	spa_get_errlists(spa_t spa, avl_tree_t last, avl_tree_t *scrub)
	{
	ASSERT(MUTEX_HELD(&spa->spa_errlist_lock));

	bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t));
	bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t));

	avl_create(&spa->spa_errlist_scrub,
	spa_error_entry_compare, sizeof (spa_error_entry_t),
	offsetof(spa_error_entry_t, se_avl));
	avl_create(&spa->spa_errlist_last,
	spa_error_entry_compare, sizeof (spa_error_entry_t),
	offsetof(spa_error_entry_t, se_avl));
	}

	static void
	spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q)
	{
	const zio_taskq_info_t *ztip = &zio_taskqs[t][q];
	enum zti_modes mode = ztip->zti_mode;
	uint_t value = ztip->zti_value;
	uint_t count = ztip->zti_count;
	spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
	uint_t cpus, flags = TASKQ_DYNAMIC;
	boolean_t batch = B_FALSE;

	switch (mode) {
	case ZTI_MODE_FIXED:
	ASSERT3U(value, >, 0);
	break;

	case ZTI_MODE_BATCH:
	batch = B_TRUE;
	flags \|= TASKQ_THREADS_CPU_PCT;
	value = MIN(zio_taskq_batch_pct, 100);
	break;

	case ZTI_MODE_SCALE:
	flags \|= TASKQ_THREADS_CPU_PCT;
	/*
	* We want more taskqs to reduce lock contention, but we want
	* less for better request ordering and CPU utilization.
	*/
	cpus = MAX(1, boot_ncpus * zio_taskq_batch_pct / 100);
	if (zio_taskq_batch_tpq > 0) {
	count = MAX(1, (cpus + zio_taskq_batch_tpq / 2) /
	zio_taskq_batch_tpq);
	} else {
	/*
	* Prefer 6 threads per taskq, but no more taskqs
	* than threads in them on large systems. For 80%:
	*
	* taskq taskq total
	* cpus taskqs percent threads threads
	* ------- ------- ------- ------- -------
	* 1 1 80% 1 1
	* 2 1 80% 1 1
	* 4 1 80% 3 3
	* 8 2 40% 3 6
	* 16 3 27% 4 12
	* 32 5 16% 5 25
	* 64 7 11% 7 49
	* 128 10 8% 10 100
	* 256 14 6% 15 210
	*/
	count = 1 + cpus / 6;
	while (count * count > cpus)
	count--;
	}
	/* Limit each taskq within 100% to not trigger assertion. */
	count = MAX(count, (zio_taskq_batch_pct + 99) / 100);
	value = (zio_taskq_batch_pct + count / 2) / count;
	break;

	case ZTI_MODE_NULL:
	tqs->stqs_count = 0;
	tqs->stqs_taskq = NULL;
	return;

	default:
	panic("unrecognized mode for %s_%s taskq (%u:%u) in "
	"spa_activate()",
	zio_type_name[t], zio_taskq_types[q], mode, value);
	break;
	}

	ASSERT3U(count, >, 0);
	tqs->stqs_count = count;
	tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP);

	for (uint_t i = 0; i < count; i++) {
	taskq_t *tq;
	char name[32];

	if (count > 1)
	(void) snprintf(name, sizeof (name), "%s_%s_%u",
	zio_type_name[t], zio_taskq_types[q], i);
	else
	(void) snprintf(name, sizeof (name), "%s_%s",
	zio_type_name[t], zio_taskq_types[q]);

	if (zio_taskq_sysdc && spa->spa_proc != &p0) {
	if (batch)
	flags \|= TASKQ_DC_BATCH;

	tq = taskq_create_sysdc(name, value, 50, INT_MAX,
	spa->spa_proc, zio_taskq_basedc, flags);
	} else {
	pri_t pri = maxclsyspri;
	/*
	* The write issue taskq can be extremely CPU
	* intensive. Run it at slightly less important
	* priority than the other taskqs.
	*
	* Under Linux and FreeBSD this means incrementing
	* the priority value as opposed to platforms like
	* illumos where it should be decremented.
	*
	* On FreeBSD, if priorities divided by four (RQ_PPQ)
	* are equal then a difference between them is
	* insignificant.
	*/
	if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE) {
	#if defined(__linux__)
	pri++;
	#elif defined(__FreeBSD__)
	pri += 4;
	#else
	#error "unknown OS"
	#endif
	}
	tq = taskq_create_proc(name, value, pri, 50,
	INT_MAX, spa->spa_proc, flags);
	}

	tqs->stqs_taskq[i] = tq;
	}
	}

	static void
	spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q)
	{
	spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];

	if (tqs->stqs_taskq == NULL) {
	ASSERT3U(tqs->stqs_count, ==, 0);
	return;
	}

	for (uint_t i = 0; i < tqs->stqs_count; i++) {
	ASSERT3P(tqs->stqs_taskq[i], !=, NULL);
	taskq_destroy(tqs->stqs_taskq[i]);
	}

	kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *));
	tqs->stqs_taskq = NULL;
	}

	/*
	* Dispatch a task to the appropriate taskq for the ZFS I/O type and priority.
	* Note that a type may have multiple discrete taskqs to avoid lock contention
	* on the taskq itself. In that case we choose which taskq at random by using
	* the low bits of gethrtime().
	*/
	void
	spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
	task_func_t func, void arg, uint_t flags, taskq_ent_t *ent)
	{
	spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
	taskq_t *tq;

	ASSERT3P(tqs->stqs_taskq, !=, NULL);
	ASSERT3U(tqs->stqs_count, !=, 0);

	if (tqs->stqs_count == 1) {
	tq = tqs->stqs_taskq[0];
	} else {
	tq = tqs->stqs_taskq[((uint64_t)gethrtime()) % tqs->stqs_count];
	}

	taskq_dispatch_ent(tq, func, arg, flags, ent);
	}

	/*
	* Same as spa_taskq_dispatch_ent() but block on the task until completion.
	*/
	void
	spa_taskq_dispatch_sync(spa_t *spa, zio_type_t t, zio_taskq_type_t q,
	task_func_t func, void arg, uint_t flags)
	{
	spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
	taskq_t *tq;
	taskqid_t id;

	ASSERT3P(tqs->stqs_taskq, !=, NULL);
	ASSERT3U(tqs->stqs_count, !=, 0);

	if (tqs->stqs_count == 1) {
	tq = tqs->stqs_taskq[0];
	} else {
	tq = tqs->stqs_taskq[((uint64_t)gethrtime()) % tqs->stqs_count];
	}

	id = taskq_dispatch(tq, func, arg, flags);
	if (id)
	taskq_wait_id(tq, id);
	}

	static void
	spa_create_zio_taskqs(spa_t *spa)
	{
	for (int t = 0; t < ZIO_TYPES; t++) {
	for (int q = 0; q < ZIO_TASKQ_TYPES; q++) {
	spa_taskqs_init(spa, t, q);
	}
	}
	}

	/*
	* Disabled until spa_thread() can be adapted for Linux.
	*/
	#undef HAVE_SPA_THREAD

	#if defined(_KERNEL) && defined(HAVE_SPA_THREAD)
	static void
	spa_thread(void *arg)
	{
	psetid_t zio_taskq_psrset_bind = PS_NONE;
	callb_cpr_t cprinfo;

	spa_t *spa = arg;
	user_t *pu = PTOU(curproc);

	CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr,
	spa->spa_name);

	ASSERT(curproc != &p0);
	(void) snprintf(pu->u_psargs, sizeof (pu->u_psargs),
	"zpool-%s", spa->spa_name);
	(void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm));

	/* bind this thread to the requested psrset */
	if (zio_taskq_psrset_bind != PS_NONE) {
	pool_lock();
	mutex_enter(&cpu_lock);
	mutex_enter(&pidlock);
	mutex_enter(&curproc->p_lock);

	if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind,
	0, NULL, NULL) == 0) {
	curthread->t_bind_pset = zio_taskq_psrset_bind;
	} else {
	cmn_err(CE_WARN,
	"Couldn't bind process for zfs pool \"%s\" to "
	"pset %d\n", spa->spa_name, zio_taskq_psrset_bind);
	}

	mutex_exit(&curproc->p_lock);
	mutex_exit(&pidlock);
	mutex_exit(&cpu_lock);
	pool_unlock();
	}

	if (zio_taskq_sysdc) {
	sysdc_thread_enter(curthread, 100, 0);
	}

	spa->spa_proc = curproc;
	spa->spa_did = curthread->t_did;

	spa_create_zio_taskqs(spa);

	mutex_enter(&spa->spa_proc_lock);
	ASSERT(spa->spa_proc_state == SPA_PROC_CREATED);

	spa->spa_proc_state = SPA_PROC_ACTIVE;
	cv_broadcast(&spa->spa_proc_cv);

	CALLB_CPR_SAFE_BEGIN(&cprinfo);
	while (spa->spa_proc_state == SPA_PROC_ACTIVE)
	cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock);
	CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock);

	ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE);
	spa->spa_proc_state = SPA_PROC_GONE;
	spa->spa_proc = &p0;
	cv_broadcast(&spa->spa_proc_cv);
	CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */

	mutex_enter(&curproc->p_lock);
	lwp_exit();
	}
	#endif

	/*
	* Activate an uninitialized pool.
	*/
	static void
	spa_activate(spa_t *spa, spa_mode_t mode)
	{
	ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);

	spa->spa_state = POOL_STATE_ACTIVE;
	spa->spa_mode = mode;

	spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops);
	spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops);
	spa->spa_embedded_log_class =
	metaslab_class_create(spa, zfs_metaslab_ops);
	spa->spa_special_class = metaslab_class_create(spa, zfs_metaslab_ops);
	spa->spa_dedup_class = metaslab_class_create(spa, zfs_metaslab_ops);

	/* Try to create a covering process */
	mutex_enter(&spa->spa_proc_lock);
	ASSERT(spa->spa_proc_state == SPA_PROC_NONE);
	ASSERT(spa->spa_proc == &p0);
	spa->spa_did = 0;

	#ifdef HAVE_SPA_THREAD
	/* Only create a process if we're going to be around a while. */
	if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) {
	if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri,
	NULL, 0) == 0) {
	spa->spa_proc_state = SPA_PROC_CREATED;
	while (spa->spa_proc_state == SPA_PROC_CREATED) {
	cv_wait(&spa->spa_proc_cv,
	&spa->spa_proc_lock);
	}
	ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE);
	ASSERT(spa->spa_proc != &p0);
	ASSERT(spa->spa_did != 0);
	} else {
	#ifdef _KERNEL
	cmn_err(CE_WARN,
	"Couldn't create process for zfs pool \"%s\"\n",
	spa->spa_name);
	#endif
	}
	}
	#endif /* HAVE_SPA_THREAD */
	mutex_exit(&spa->spa_proc_lock);

	/* If we didn't create a process, we need to create our taskqs. */
	if (spa->spa_proc == &p0) {
	spa_create_zio_taskqs(spa);
	}

	for (size_t i = 0; i < TXG_SIZE; i++) {
	spa->spa_txg_zio[i] = zio_root(spa, NULL, NULL,
	ZIO_FLAG_CANFAIL);
	}

	list_create(&spa->spa_config_dirty_list, sizeof (vdev_t),
	offsetof(vdev_t, vdev_config_dirty_node));
	list_create(&spa->spa_evicting_os_list, sizeof (objset_t),
	offsetof(objset_t, os_evicting_node));
	list_create(&spa->spa_state_dirty_list, sizeof (vdev_t),
	offsetof(vdev_t, vdev_state_dirty_node));

	txg_list_create(&spa->spa_vdev_txg_list, spa,
	offsetof(struct vdev, vdev_txg_node));

	avl_create(&spa->spa_errlist_scrub,
	spa_error_entry_compare, sizeof (spa_error_entry_t),
	offsetof(spa_error_entry_t, se_avl));
	avl_create(&spa->spa_errlist_last,
	spa_error_entry_compare, sizeof (spa_error_entry_t),
	offsetof(spa_error_entry_t, se_avl));

	spa_keystore_init(&spa->spa_keystore);

	/*
	* This taskq is used to perform zvol-minor-related tasks
	* asynchronously. This has several advantages, including easy
	* resolution of various deadlocks.
	*
	* The taskq must be single threaded to ensure tasks are always
	* processed in the order in which they were dispatched.
	*
	* A taskq per pool allows one to keep the pools independent.
	* This way if one pool is suspended, it will not impact another.
	*
	* The preferred location to dispatch a zvol minor task is a sync
	* task. In this context, there is easy access to the spa_t and minimal
	* error handling is required because the sync task must succeed.
	*/
	spa->spa_zvol_taskq = taskq_create("z_zvol", 1, defclsyspri,
	1, INT_MAX, 0);

	/*
	* Taskq dedicated to prefetcher threads: this is used to prevent the
	* pool traverse code from monopolizing the global (and limited)
	* system_taskq by inappropriately scheduling long running tasks on it.
	*/
	spa->spa_prefetch_taskq = taskq_create("z_prefetch", 100,
	defclsyspri, 1, INT_MAX, TASKQ_DYNAMIC \| TASKQ_THREADS_CPU_PCT);

	/*
	* The taskq to upgrade datasets in this pool. Currently used by
	* feature SPA_FEATURE_USEROBJ_ACCOUNTING/SPA_FEATURE_PROJECT_QUOTA.
	*/
	spa->spa_upgrade_taskq = taskq_create("z_upgrade", 100,
	defclsyspri, 1, INT_MAX, TASKQ_DYNAMIC \| TASKQ_THREADS_CPU_PCT);
	}

	/*
	* Opposite of spa_activate().
	*/
	static void
	spa_deactivate(spa_t *spa)
	{
	ASSERT(spa->spa_sync_on == B_FALSE);
	ASSERT(spa->spa_dsl_pool == NULL);
	ASSERT(spa->spa_root_vdev == NULL);
	ASSERT(spa->spa_async_zio_root == NULL);
	ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED);

	spa_evicting_os_wait(spa);

	if (spa->spa_zvol_taskq) {
	taskq_destroy(spa->spa_zvol_taskq);
	spa->spa_zvol_taskq = NULL;
	}

	if (spa->spa_prefetch_taskq) {
	taskq_destroy(spa->spa_prefetch_taskq);
	spa->spa_prefetch_taskq = NULL;
	}

	if (spa->spa_upgrade_taskq) {
	taskq_destroy(spa->spa_upgrade_taskq);
	spa->spa_upgrade_taskq = NULL;
	}

	txg_list_destroy(&spa->spa_vdev_txg_list);

	list_destroy(&spa->spa_config_dirty_list);
	list_destroy(&spa->spa_evicting_os_list);
	list_destroy(&spa->spa_state_dirty_list);

	taskq_cancel_id(system_delay_taskq, spa->spa_deadman_tqid);

	for (int t = 0; t < ZIO_TYPES; t++) {
	for (int q = 0; q < ZIO_TASKQ_TYPES; q++) {
	spa_taskqs_fini(spa, t, q);
	}
	}

	for (size_t i = 0; i < TXG_SIZE; i++) {
	ASSERT3P(spa->spa_txg_zio[i], !=, NULL);
	VERIFY0(zio_wait(spa->spa_txg_zio[i]));
	spa->spa_txg_zio[i] = NULL;
	}

	metaslab_class_destroy(spa->spa_normal_class);
	spa->spa_normal_class = NULL;

	metaslab_class_destroy(spa->spa_log_class);
	spa->spa_log_class = NULL;

	metaslab_class_destroy(spa->spa_embedded_log_class);
	spa->spa_embedded_log_class = NULL;

	metaslab_class_destroy(spa->spa_special_class);
	spa->spa_special_class = NULL;

	metaslab_class_destroy(spa->spa_dedup_class);
	spa->spa_dedup_class = NULL;

	/*
	* If this was part of an import or the open otherwise failed, we may
	* still have errors left in the queues. Empty them just in case.
	*/
	spa_errlog_drain(spa);
	avl_destroy(&spa->spa_errlist_scrub);
	avl_destroy(&spa->spa_errlist_last);

	spa_keystore_fini(&spa->spa_keystore);

	spa->spa_state = POOL_STATE_UNINITIALIZED;

	mutex_enter(&spa->spa_proc_lock);
	if (spa->spa_proc_state != SPA_PROC_NONE) {
	ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE);
	spa->spa_proc_state = SPA_PROC_DEACTIVATE;
	cv_broadcast(&spa->spa_proc_cv);
	while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) {
	ASSERT(spa->spa_proc != &p0);
	cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock);
	}
	ASSERT(spa->spa_proc_state == SPA_PROC_GONE);
	spa->spa_proc_state = SPA_PROC_NONE;
	}
	ASSERT(spa->spa_proc == &p0);
	mutex_exit(&spa->spa_proc_lock);

	/*
	* We want to make sure spa_thread() has actually exited the ZFS
	* module, so that the module can't be unloaded out from underneath
	* it.
	*/
	if (spa->spa_did != 0) {
	thread_join(spa->spa_did);
	spa->spa_did = 0;
	}
	}

	/*
	* Verify a pool configuration, and construct the vdev tree appropriately. This
	* will create all the necessary vdevs in the appropriate layout, with each vdev
	* in the CLOSED state. This will prep the pool before open/creation/import.
	* All vdev validation is done by the vdev_alloc() routine.
	*/
	int
	spa_config_parse(spa_t spa, vdev_t vdp, nvlist_t nv, vdev_t *parent,
	uint_t id, int atype)
	{
	nvlist_t **child;
	uint_t children;
	int error;

	if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0)
	return (error);

	if ((*vdp)->vdev_ops->vdev_op_leaf)
	return (0);

	error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	&child, &children);

	if (error == ENOENT)
	return (0);

	if (error) {
	vdev_free(*vdp);
	*vdp = NULL;
	return (SET_ERROR(EINVAL));
	}

	for (int c = 0; c < children; c++) {
	vdev_t *vd;
	if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c,
	atype)) != 0) {
	vdev_free(*vdp);
	*vdp = NULL;
	return (error);
	}
	}

	ASSERT(*vdp != NULL);

	return (0);
	}

	static boolean_t
	spa_should_flush_logs_on_unload(spa_t *spa)
	{
	if (!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))
	return (B_FALSE);

	if (!spa_writeable(spa))
	return (B_FALSE);

	if (!spa->spa_sync_on)
	return (B_FALSE);

	if (spa_state(spa) != POOL_STATE_EXPORTED)
	return (B_FALSE);

	if (zfs_keep_log_spacemaps_at_export)
	return (B_FALSE);

	return (B_TRUE);
	}

	/*
	* Opens a transaction that will set the flag that will instruct
	* spa_sync to attempt to flush all the metaslabs for that txg.
	*/
	static void
	spa_unload_log_sm_flush_all(spa_t *spa)
	{
	dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
	VERIFY0(dmu_tx_assign(tx, TXG_WAIT));

	ASSERT3U(spa->spa_log_flushall_txg, ==, 0);
	spa->spa_log_flushall_txg = dmu_tx_get_txg(tx);

	dmu_tx_commit(tx);
	txg_wait_synced(spa_get_dsl(spa), spa->spa_log_flushall_txg);
	}

	static void
	spa_unload_log_sm_metadata(spa_t *spa)
	{
	void *cookie = NULL;
	spa_log_sm_t *sls;
	while ((sls = avl_destroy_nodes(&spa->spa_sm_logs_by_txg,
	&cookie)) != NULL) {
	VERIFY0(sls->sls_mscount);
	kmem_free(sls, sizeof (spa_log_sm_t));
	}

	for (log_summary_entry_t *e = list_head(&spa->spa_log_summary);
	e != NULL; e = list_head(&spa->spa_log_summary)) {
	VERIFY0(e->lse_mscount);
	list_remove(&spa->spa_log_summary, e);
	kmem_free(e, sizeof (log_summary_entry_t));
	}

	spa->spa_unflushed_stats.sus_nblocks = 0;
	spa->spa_unflushed_stats.sus_memused = 0;
	spa->spa_unflushed_stats.sus_blocklimit = 0;
	}

	static void
	spa_destroy_aux_threads(spa_t *spa)
	{
	if (spa->spa_condense_zthr != NULL) {
	zthr_destroy(spa->spa_condense_zthr);
	spa->spa_condense_zthr = NULL;
	}
	if (spa->spa_checkpoint_discard_zthr != NULL) {
	zthr_destroy(spa->spa_checkpoint_discard_zthr);
	spa->spa_checkpoint_discard_zthr = NULL;
	}
	if (spa->spa_livelist_delete_zthr != NULL) {
	zthr_destroy(spa->spa_livelist_delete_zthr);
	spa->spa_livelist_delete_zthr = NULL;
	}
	if (spa->spa_livelist_condense_zthr != NULL) {
	zthr_destroy(spa->spa_livelist_condense_zthr);
	spa->spa_livelist_condense_zthr = NULL;
	}
	}

	/*
	* Opposite of spa_load().
	*/
	static void
	spa_unload(spa_t *spa)
	{
	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	ASSERT(spa_state(spa) != POOL_STATE_UNINITIALIZED);

	spa_import_progress_remove(spa_guid(spa));
	spa_load_note(spa, "UNLOADING");

	spa_wake_waiters(spa);

	/*
	* If the log space map feature is enabled and the pool is getting
	* exported (but not destroyed), we want to spend some time flushing
	* as many metaslabs as we can in an attempt to destroy log space
	* maps and save import time.
	*/
	if (spa_should_flush_logs_on_unload(spa))
	spa_unload_log_sm_flush_all(spa);

	/*
	* Stop async tasks.
	*/
	spa_async_suspend(spa);

	if (spa->spa_root_vdev) {
	vdev_t *root_vdev = spa->spa_root_vdev;
	vdev_initialize_stop_all(root_vdev, VDEV_INITIALIZE_ACTIVE);
	vdev_trim_stop_all(root_vdev, VDEV_TRIM_ACTIVE);
	vdev_autotrim_stop_all(spa);
	vdev_rebuild_stop_all(spa);
	}

	/*
	* Stop syncing.
	*/
	if (spa->spa_sync_on) {
	txg_sync_stop(spa->spa_dsl_pool);
	spa->spa_sync_on = B_FALSE;
	}

	/*
	* This ensures that there is no async metaslab prefetching
	* while we attempt to unload the spa.
	*/
	if (spa->spa_root_vdev != NULL) {
	for (int c = 0; c < spa->spa_root_vdev->vdev_children; c++) {
	vdev_t *vc = spa->spa_root_vdev->vdev_child[c];
	if (vc->vdev_mg != NULL)
	taskq_wait(vc->vdev_mg->mg_taskq);
	}
	}

	if (spa->spa_mmp.mmp_thread)
	mmp_thread_stop(spa);

	/*
	* Wait for any outstanding async I/O to complete.
	*/
	if (spa->spa_async_zio_root != NULL) {
	for (int i = 0; i < max_ncpus; i++)
	(void) zio_wait(spa->spa_async_zio_root[i]);
	kmem_free(spa->spa_async_zio_root, max_ncpus * sizeof (void *));
	spa->spa_async_zio_root = NULL;
	}

	if (spa->spa_vdev_removal != NULL) {
	spa_vdev_removal_destroy(spa->spa_vdev_removal);
	spa->spa_vdev_removal = NULL;
	}

	spa_destroy_aux_threads(spa);

	spa_condense_fini(spa);

	bpobj_close(&spa->spa_deferred_bpobj);

	spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);

	/*
	* Close all vdevs.
	*/
	if (spa->spa_root_vdev)
	vdev_free(spa->spa_root_vdev);
	ASSERT(spa->spa_root_vdev == NULL);

	/*
	* Close the dsl pool.
	*/
	if (spa->spa_dsl_pool) {
	dsl_pool_close(spa->spa_dsl_pool);
	spa->spa_dsl_pool = NULL;
	spa->spa_meta_objset = NULL;
	}

	ddt_unload(spa);
	spa_unload_log_sm_metadata(spa);

	/*
	* Drop and purge level 2 cache
	*/
	spa_l2cache_drop(spa);

	for (int i = 0; i < spa->spa_spares.sav_count; i++)
	vdev_free(spa->spa_spares.sav_vdevs[i]);
	if (spa->spa_spares.sav_vdevs) {
	kmem_free(spa->spa_spares.sav_vdevs,
	spa->spa_spares.sav_count * sizeof (void *));
	spa->spa_spares.sav_vdevs = NULL;
	}
	if (spa->spa_spares.sav_config) {
	nvlist_free(spa->spa_spares.sav_config);
	spa->spa_spares.sav_config = NULL;
	}
	spa->spa_spares.sav_count = 0;

	for (int i = 0; i < spa->spa_l2cache.sav_count; i++) {
	vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]);
	vdev_free(spa->spa_l2cache.sav_vdevs[i]);
	}
	if (spa->spa_l2cache.sav_vdevs) {
	kmem_free(spa->spa_l2cache.sav_vdevs,
	spa->spa_l2cache.sav_count * sizeof (void *));
	spa->spa_l2cache.sav_vdevs = NULL;
	}
	if (spa->spa_l2cache.sav_config) {
	nvlist_free(spa->spa_l2cache.sav_config);
	spa->spa_l2cache.sav_config = NULL;
	}
	spa->spa_l2cache.sav_count = 0;

	spa->spa_async_suspended = 0;

	spa->spa_indirect_vdevs_loaded = B_FALSE;

	if (spa->spa_comment != NULL) {
	spa_strfree(spa->spa_comment);
	spa->spa_comment = NULL;
	}
	if (spa->spa_compatibility != NULL) {
	spa_strfree(spa->spa_compatibility);
	spa->spa_compatibility = NULL;
	}

	spa_config_exit(spa, SCL_ALL, spa);
	}

	/*
	* Load (or re-load) the current list of vdevs describing the active spares for
	* this pool. When this is called, we have some form of basic information in
	* 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and
	* then re-generate a more complete list including status information.
	*/
	void
	spa_load_spares(spa_t *spa)
	{
	nvlist_t **spares;
	uint_t nspares;
	int i;
	vdev_t vd, tvd;

	#ifndef _KERNEL
	/*
	* zdb opens both the current state of the pool and the
	* checkpointed state (if present), with a different spa_t.
	*
	* As spare vdevs are shared among open pools, we skip loading
	* them when we load the checkpointed state of the pool.
	*/
	if (!spa_writeable(spa))
	return;
	#endif

	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);

	/*
	* First, close and free any existing spare vdevs.
	*/
	for (i = 0; i < spa->spa_spares.sav_count; i++) {
	vd = spa->spa_spares.sav_vdevs[i];

	/* Undo the call to spa_activate() below */
	if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid,
	B_FALSE)) != NULL && tvd->vdev_isspare)
	spa_spare_remove(tvd);
	vdev_close(vd);
	vdev_free(vd);
	}

	if (spa->spa_spares.sav_vdevs)
	kmem_free(spa->spa_spares.sav_vdevs,
	spa->spa_spares.sav_count * sizeof (void *));

	if (spa->spa_spares.sav_config == NULL)
	nspares = 0;
	else
	VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
	ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);

	spa->spa_spares.sav_count = (int)nspares;
	spa->spa_spares.sav_vdevs = NULL;

	if (nspares == 0)
	return;

	/*
	* Construct the array of vdevs, opening them to get status in the
	* process. For each spare, there is potentially two different vdev_t
	* structures associated with it: one in the list of spares (used only
	* for basic validation purposes) and one in the active vdev
	* configuration (if it's spared in). During this phase we open and
	* validate each vdev on the spare list. If the vdev also exists in the
	* active configuration, then we also mark this vdev as an active spare.
	*/
	spa->spa_spares.sav_vdevs = kmem_zalloc(nspares * sizeof (void *),
	KM_SLEEP);
	for (i = 0; i < spa->spa_spares.sav_count; i++) {
	VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0,
	VDEV_ALLOC_SPARE) == 0);
	ASSERT(vd != NULL);

	spa->spa_spares.sav_vdevs[i] = vd;

	if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid,
	B_FALSE)) != NULL) {
	if (!tvd->vdev_isspare)
	spa_spare_add(tvd);

	/*
	* We only mark the spare active if we were successfully
	* able to load the vdev. Otherwise, importing a pool
	* with a bad active spare would result in strange
	* behavior, because multiple pool would think the spare
	* is actively in use.
	*
	* There is a vulnerability here to an equally bizarre
	* circumstance, where a dead active spare is later
	* brought back to life (onlined or otherwise). Given
	* the rarity of this scenario, and the extra complexity
	* it adds, we ignore the possibility.
	*/
	if (!vdev_is_dead(tvd))
	spa_spare_activate(tvd);
	}

	vd->vdev_top = vd;
	vd->vdev_aux = &spa->spa_spares;

	if (vdev_open(vd) != 0)
	continue;

	if (vdev_validate_aux(vd) == 0)
	spa_spare_add(vd);
	}

	/*
	* Recompute the stashed list of spares, with status information
	* this time.
	*/
	VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES,
	DATA_TYPE_NVLIST_ARRAY) == 0);

	spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *),
	KM_SLEEP);
	for (i = 0; i < spa->spa_spares.sav_count; i++)
	spares[i] = vdev_config_generate(spa,
	spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE);
	VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
	ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0);
	for (i = 0; i < spa->spa_spares.sav_count; i++)
	nvlist_free(spares[i]);
	kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *));
	}

	/*
	* Load (or re-load) the current list of vdevs describing the active l2cache for
	* this pool. When this is called, we have some form of basic information in
	* 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and
	* then re-generate a more complete list including status information.
	* Devices which are already active have their details maintained, and are
	* not re-opened.
	*/
	void
	spa_load_l2cache(spa_t *spa)
	{
	nvlist_t **l2cache = NULL;
	uint_t nl2cache;
	int i, j, oldnvdevs;
	uint64_t guid;
	vdev_t vd, oldvdevs, *newvdevs;
	spa_aux_vdev_t *sav = &spa->spa_l2cache;

	#ifndef _KERNEL
	/*
	* zdb opens both the current state of the pool and the
	* checkpointed state (if present), with a different spa_t.
	*
	* As L2 caches are part of the ARC which is shared among open
	* pools, we skip loading them when we load the checkpointed
	* state of the pool.
	*/
	if (!spa_writeable(spa))
	return;
	#endif

	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);

	oldvdevs = sav->sav_vdevs;
	oldnvdevs = sav->sav_count;
	sav->sav_vdevs = NULL;
	sav->sav_count = 0;

	if (sav->sav_config == NULL) {
	nl2cache = 0;
	newvdevs = NULL;
	goto out;
	}

	VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
	ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);
	newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP);

	/*
	* Process new nvlist of vdevs.
	*/
	for (i = 0; i < nl2cache; i++) {
	VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID,
	&guid) == 0);

	newvdevs[i] = NULL;
	for (j = 0; j < oldnvdevs; j++) {
	vd = oldvdevs[j];
	if (vd != NULL && guid == vd->vdev_guid) {
	/*
	* Retain previous vdev for add/remove ops.
	*/
	newvdevs[i] = vd;
	oldvdevs[j] = NULL;
	break;
	}
	}

	if (newvdevs[i] == NULL) {
	/*
	* Create new vdev
	*/
	VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0,
	VDEV_ALLOC_L2CACHE) == 0);
	ASSERT(vd != NULL);
	newvdevs[i] = vd;

	/*
	* Commit this vdev as an l2cache device,
	* even if it fails to open.
	*/
	spa_l2cache_add(vd);

	vd->vdev_top = vd;
	vd->vdev_aux = sav;

	spa_l2cache_activate(vd);

	if (vdev_open(vd) != 0)
	continue;

	(void) vdev_validate_aux(vd);

	if (!vdev_is_dead(vd))
	l2arc_add_vdev(spa, vd);

	/*
	* Upon cache device addition to a pool or pool
	* creation with a cache device or if the header
	* of the device is invalid we issue an async
	* TRIM command for the whole device which will
	* execute if l2arc_trim_ahead > 0.
	*/
	spa_async_request(spa, SPA_ASYNC_L2CACHE_TRIM);
	}
	}

	sav->sav_vdevs = newvdevs;
	sav->sav_count = (int)nl2cache;

	/*
	* Recompute the stashed list of l2cache devices, with status
	* information this time.
	*/
	VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE,
	DATA_TYPE_NVLIST_ARRAY) == 0);

	if (sav->sav_count > 0)
	l2cache = kmem_alloc(sav->sav_count * sizeof (void *),
	KM_SLEEP);
	for (i = 0; i < sav->sav_count; i++)
	l2cache[i] = vdev_config_generate(spa,
	sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE);
	VERIFY(nvlist_add_nvlist_array(sav->sav_config,
	ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0);

	out:
	/*
	* Purge vdevs that were dropped
	*/
	for (i = 0; i < oldnvdevs; i++) {
	uint64_t pool;

	vd = oldvdevs[i];
	if (vd != NULL) {
	ASSERT(vd->vdev_isl2cache);

	if (spa_l2cache_exists(vd->vdev_guid, &pool) &&
	pool != 0ULL && l2arc_vdev_present(vd))
	l2arc_remove_vdev(vd);
	vdev_clear_stats(vd);
	vdev_free(vd);
	}
	}

	if (oldvdevs)
	kmem_free(oldvdevs, oldnvdevs * sizeof (void *));

	for (i = 0; i < sav->sav_count; i++)
	nvlist_free(l2cache[i]);
	if (sav->sav_count)
	kmem_free(l2cache, sav->sav_count * sizeof (void *));
	}

	static int
	load_nvlist(spa_t spa, uint64_t obj, nvlist_t *value)
	{
	dmu_buf_t *db;
	char *packed = NULL;
	size_t nvsize = 0;
	int error;
	*value = NULL;

	error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db);
	if (error)
	return (error);

	nvsize = (uint64_t )db->db_data;
	dmu_buf_rele(db, FTAG);

	packed = vmem_alloc(nvsize, KM_SLEEP);
	error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed,
	DMU_READ_PREFETCH);
	if (error == 0)
	error = nvlist_unpack(packed, nvsize, value, 0);
	vmem_free(packed, nvsize);

	return (error);
	}

	/*
	* Concrete top-level vdevs that are not missing and are not logs. At every
	* spa_sync we write new uberblocks to at least SPA_SYNC_MIN_VDEVS core tvds.
	*/
	static uint64_t
	spa_healthy_core_tvds(spa_t *spa)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	uint64_t tvds = 0;

	for (uint64_t i = 0; i < rvd->vdev_children; i++) {
	vdev_t *vd = rvd->vdev_child[i];
	if (vd->vdev_islog)
	continue;
	if (vdev_is_concrete(vd) && !vdev_is_dead(vd))
	tvds++;
	}

	return (tvds);
	}

	/*
	* Checks to see if the given vdev could not be opened, in which case we post a
	* sysevent to notify the autoreplace code that the device has been removed.
	*/
	static void
	spa_check_removed(vdev_t *vd)
	{
	for (uint64_t c = 0; c < vd->vdev_children; c++)
	spa_check_removed(vd->vdev_child[c]);

	if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) &&
	vdev_is_concrete(vd)) {
	zfs_post_autoreplace(vd->vdev_spa, vd);
	spa_event_notify(vd->vdev_spa, vd, NULL, ESC_ZFS_VDEV_CHECK);
	}
	}

	static int
	spa_check_for_missing_logs(spa_t *spa)
	{
	vdev_t *rvd = spa->spa_root_vdev;

	/*
	* If we're doing a normal import, then build up any additional
	* diagnostic information about missing log devices.
	* We'll pass this up to the user for further processing.
	*/
	if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) {
	nvlist_t *child, nv;
	uint64_t idx = 0;

	child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t *),
	KM_SLEEP);
	VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);

	for (uint64_t c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];

	/*
	* We consider a device as missing only if it failed
	* to open (i.e. offline or faulted is not considered
	* as missing).
	*/
	if (tvd->vdev_islog &&
	tvd->vdev_state == VDEV_STATE_CANT_OPEN) {
	child[idx++] = vdev_config_generate(spa, tvd,
	B_FALSE, VDEV_CONFIG_MISSING);
	}
	}

	if (idx > 0) {
	fnvlist_add_nvlist_array(nv,
	ZPOOL_CONFIG_CHILDREN, child, idx);
	fnvlist_add_nvlist(spa->spa_load_info,
	ZPOOL_CONFIG_MISSING_DEVICES, nv);

	for (uint64_t i = 0; i < idx; i++)
	nvlist_free(child[i]);
	}
	nvlist_free(nv);
	kmem_free(child, rvd->vdev_children * sizeof (char **));

	if (idx > 0) {
	spa_load_failed(spa, "some log devices are missing");
	vdev_dbgmsg_print_tree(rvd, 2);
	return (SET_ERROR(ENXIO));
	}
	} else {
	for (uint64_t c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];

	if (tvd->vdev_islog &&
	tvd->vdev_state == VDEV_STATE_CANT_OPEN) {
	spa_set_log_state(spa, SPA_LOG_CLEAR);
	spa_load_note(spa, "some log devices are "
	"missing, ZIL is dropped.");
	vdev_dbgmsg_print_tree(rvd, 2);
	break;
	}
	}
	}

	return (0);
	}

	/*
	* Check for missing log devices
	*/
	static boolean_t
	spa_check_logs(spa_t *spa)
	{
	boolean_t rv = B_FALSE;
	dsl_pool_t *dp = spa_get_dsl(spa);

	switch (spa->spa_log_state) {
	default:
	break;
	case SPA_LOG_MISSING:
	/* need to recheck in case slog has been restored */
	case SPA_LOG_UNKNOWN:
	rv = (dmu_objset_find_dp(dp, dp->dp_root_dir_obj,
	zil_check_log_chain, NULL, DS_FIND_CHILDREN) != 0);
	if (rv)
	spa_set_log_state(spa, SPA_LOG_MISSING);
	break;
	}
	return (rv);
	}

	/*
	* Passivate any log vdevs (note, does not apply to embedded log metaslabs).
	*/
	static boolean_t
	spa_passivate_log(spa_t *spa)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	boolean_t slog_found = B_FALSE;

	ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER));

	for (int c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];

	if (tvd->vdev_islog) {
	ASSERT3P(tvd->vdev_log_mg, ==, NULL);
	metaslab_group_passivate(tvd->vdev_mg);
	slog_found = B_TRUE;
	}
	}

	return (slog_found);
	}

	/*
	* Activate any log vdevs (note, does not apply to embedded log metaslabs).
	*/
	static void
	spa_activate_log(spa_t *spa)
	{
	vdev_t *rvd = spa->spa_root_vdev;

	ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER));

	for (int c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];

	if (tvd->vdev_islog) {
	ASSERT3P(tvd->vdev_log_mg, ==, NULL);
	metaslab_group_activate(tvd->vdev_mg);
	}
	}
	}

	int
	spa_reset_logs(spa_t *spa)
	{
	int error;

	error = dmu_objset_find(spa_name(spa), zil_reset,
	NULL, DS_FIND_CHILDREN);
	if (error == 0) {
	/*
	* We successfully offlined the log device, sync out the
	* current txg so that the "stubby" block can be removed
	* by zil_sync().
	*/
	txg_wait_synced(spa->spa_dsl_pool, 0);
	}
	return (error);
	}

	static void
	spa_aux_check_removed(spa_aux_vdev_t *sav)
	{
	for (int i = 0; i < sav->sav_count; i++)
	spa_check_removed(sav->sav_vdevs[i]);
	}

	void
	spa_claim_notify(zio_t *zio)
	{
	spa_t *spa = zio->io_spa;

	if (zio->io_error)
	return;

	mutex_enter(&spa->spa_props_lock); /* any mutex will do */
	if (spa->spa_claim_max_txg < zio->io_bp->blk_birth)
	spa->spa_claim_max_txg = zio->io_bp->blk_birth;
	mutex_exit(&spa->spa_props_lock);
	}

	typedef struct spa_load_error {
	uint64_t sle_meta_count;
	uint64_t sle_data_count;
	} spa_load_error_t;

	static void
	spa_load_verify_done(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;
	spa_load_error_t *sle = zio->io_private;
	dmu_object_type_t type = BP_GET_TYPE(bp);
	int error = zio->io_error;
	spa_t *spa = zio->io_spa;

	abd_free(zio->io_abd);
	if (error) {
	if ((BP_GET_LEVEL(bp) != 0 \|\| DMU_OT_IS_METADATA(type)) &&
	type != DMU_OT_INTENT_LOG)
	atomic_inc_64(&sle->sle_meta_count);
	else
	atomic_inc_64(&sle->sle_data_count);
	}

	mutex_enter(&spa->spa_scrub_lock);
	spa->spa_load_verify_bytes -= BP_GET_PSIZE(bp);
	cv_broadcast(&spa->spa_scrub_io_cv);
	mutex_exit(&spa->spa_scrub_lock);
	}

	/*
	* Maximum number of inflight bytes is the log2 fraction of the arc size.
	* By default, we set it to 1/16th of the arc.
	*/
	int spa_load_verify_shift = 4;
	int spa_load_verify_metadata = B_TRUE;
	int spa_load_verify_data = B_TRUE;

	/ARGSUSED/
	static int
	spa_load_verify_cb(spa_t spa, zilog_t zilog, const blkptr_t *bp,
	const zbookmark_phys_t zb, const dnode_phys_t dnp, void *arg)
	{
	if (zb->zb_level == ZB_DNODE_LEVEL \|\| BP_IS_HOLE(bp) \|\|
	BP_IS_EMBEDDED(bp) \|\| BP_IS_REDACTED(bp))
	return (0);
	/*
	* Note: normally this routine will not be called if
	* spa_load_verify_metadata is not set. However, it may be useful
	* to manually set the flag after the traversal has begun.
	*/
	if (!spa_load_verify_metadata)
	return (0);
	if (!BP_IS_METADATA(bp) && !spa_load_verify_data)
	return (0);

	uint64_t maxinflight_bytes =
	arc_target_bytes() >> spa_load_verify_shift;
	zio_t *rio = arg;
	size_t size = BP_GET_PSIZE(bp);

	mutex_enter(&spa->spa_scrub_lock);
	while (spa->spa_load_verify_bytes >= maxinflight_bytes)
	cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock);
	spa->spa_load_verify_bytes += size;
	mutex_exit(&spa->spa_scrub_lock);

	zio_nowait(zio_read(rio, spa, bp, abd_alloc_for_io(size, B_FALSE), size,
	spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB,
	ZIO_FLAG_SPECULATIVE \| ZIO_FLAG_CANFAIL \|
	ZIO_FLAG_SCRUB \| ZIO_FLAG_RAW, zb));
	return (0);
	}

	/* ARGSUSED */
	static int
	verify_dataset_name_len(dsl_pool_t dp, dsl_dataset_t ds, void *arg)
	{
	if (dsl_dataset_namelen(ds) >= ZFS_MAX_DATASET_NAME_LEN)
	return (SET_ERROR(ENAMETOOLONG));

	return (0);
	}

	static int
	spa_load_verify(spa_t *spa)
	{
	zio_t *rio;
	spa_load_error_t sle = { 0 };
	zpool_load_policy_t policy;
	boolean_t verify_ok = B_FALSE;
	int error = 0;

	zpool_get_load_policy(spa->spa_config, &policy);

	if (policy.zlp_rewind & ZPOOL_NEVER_REWIND)
	return (0);

	dsl_pool_config_enter(spa->spa_dsl_pool, FTAG);
	error = dmu_objset_find_dp(spa->spa_dsl_pool,
	spa->spa_dsl_pool->dp_root_dir_obj, verify_dataset_name_len, NULL,
	DS_FIND_CHILDREN);
	dsl_pool_config_exit(spa->spa_dsl_pool, FTAG);
	if (error != 0)
	return (error);

	rio = zio_root(spa, NULL, &sle,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE);

	if (spa_load_verify_metadata) {
	if (spa->spa_extreme_rewind) {
	spa_load_note(spa, "performing a complete scan of the "
	"pool since extreme rewind is on. This may take "
	"a very long time.\n (spa_load_verify_data=%u, "
	"spa_load_verify_metadata=%u)",
	spa_load_verify_data, spa_load_verify_metadata);
	}

	error = traverse_pool(spa, spa->spa_verify_min_txg,
	TRAVERSE_PRE \| TRAVERSE_PREFETCH_METADATA \|
	TRAVERSE_NO_DECRYPT, spa_load_verify_cb, rio);
	}

	(void) zio_wait(rio);
	ASSERT0(spa->spa_load_verify_bytes);

	spa->spa_load_meta_errors = sle.sle_meta_count;
	spa->spa_load_data_errors = sle.sle_data_count;

	if (sle.sle_meta_count != 0 \|\| sle.sle_data_count != 0) {
	spa_load_note(spa, "spa_load_verify found %llu metadata errors "
	"and %llu data errors", (u_longlong_t)sle.sle_meta_count,
	(u_longlong_t)sle.sle_data_count);
	}

	if (spa_load_verify_dryrun \|\|
	(!error && sle.sle_meta_count <= policy.zlp_maxmeta &&
	sle.sle_data_count <= policy.zlp_maxdata)) {
	int64_t loss = 0;

	verify_ok = B_TRUE;
	spa->spa_load_txg = spa->spa_uberblock.ub_txg;
	spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp;

	loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts;
	VERIFY(nvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0);
	VERIFY(nvlist_add_int64(spa->spa_load_info,
	ZPOOL_CONFIG_REWIND_TIME, loss) == 0);
	VERIFY(nvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0);
	} else {
	spa->spa_load_max_txg = spa->spa_uberblock.ub_txg;
	}

	if (spa_load_verify_dryrun)
	return (0);

	if (error) {
	if (error != ENXIO && error != EIO)
	error = SET_ERROR(EIO);
	return (error);
	}

	return (verify_ok ? 0 : EIO);
	}

	/*
	* Find a value in the pool props object.
	*/
	static void
	spa_prop_find(spa_t spa, zpool_prop_t prop, uint64_t val)
	{
	(void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object,
	zpool_prop_to_name(prop), sizeof (uint64_t), 1, val);
	}

	/*
	* Find a value in the pool directory object.
	*/
	static int
	spa_dir_prop(spa_t spa, const char name, uint64_t *val, boolean_t log_enoent)
	{
	int error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
	name, sizeof (uint64_t), 1, val);

	if (error != 0 && (error != ENOENT \|\| log_enoent)) {
	spa_load_failed(spa, "couldn't get '%s' value in MOS directory "
	"[error=%d]", name, error);
	}

	return (error);
	}

	static int
	spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err)
	{
	vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux);
	return (SET_ERROR(err));
	}

	boolean_t
	spa_livelist_delete_check(spa_t *spa)
	{
	return (spa->spa_livelists_to_delete != 0);
	}

	/* ARGSUSED */
	static boolean_t
	spa_livelist_delete_cb_check(void arg, zthr_t z)
	{
	spa_t *spa = arg;
	return (spa_livelist_delete_check(spa));
	}

	static int
	delete_blkptr_cb(void arg, const blkptr_t bp, dmu_tx_t *tx)
	{
	spa_t *spa = arg;
	zio_free(spa, tx->tx_txg, bp);
	dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD,
	-bp_get_dsize_sync(spa, bp),
	-BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx);
	return (0);
	}

	static int
	dsl_get_next_livelist_obj(objset_t os, uint64_t zap_obj, uint64_t llp)
	{
	int err;
	zap_cursor_t zc;
	zap_attribute_t za;
	zap_cursor_init(&zc, os, zap_obj);
	err = zap_cursor_retrieve(&zc, &za);
	zap_cursor_fini(&zc);
	if (err == 0)
	*llp = za.za_first_integer;
	return (err);
	}

	/*
	* Components of livelist deletion that must be performed in syncing
	* context: freeing block pointers and updating the pool-wide data
	* structures to indicate how much work is left to do
	*/
	typedef struct sublist_delete_arg {
	spa_t *spa;
	dsl_deadlist_t *ll;
	uint64_t key;
	bplist_t *to_free;
	} sublist_delete_arg_t;

	static void
	sublist_delete_sync(void arg, dmu_tx_t tx)
	{
	sublist_delete_arg_t *sda = arg;
	spa_t *spa = sda->spa;
	dsl_deadlist_t *ll = sda->ll;
	uint64_t key = sda->key;
	bplist_t *to_free = sda->to_free;

	bplist_iterate(to_free, delete_blkptr_cb, spa, tx);
	dsl_deadlist_remove_entry(ll, key, tx);
	}

	typedef struct livelist_delete_arg {
	spa_t *spa;
	uint64_t ll_obj;
	uint64_t zap_obj;
	} livelist_delete_arg_t;

	static void
	livelist_delete_sync(void arg, dmu_tx_t tx)
	{
	livelist_delete_arg_t *lda = arg;
	spa_t *spa = lda->spa;
	uint64_t ll_obj = lda->ll_obj;
	uint64_t zap_obj = lda->zap_obj;
	objset_t *mos = spa->spa_meta_objset;
	uint64_t count;

	/* free the livelist and decrement the feature count */
	VERIFY0(zap_remove_int(mos, zap_obj, ll_obj, tx));
	dsl_deadlist_free(mos, ll_obj, tx);
	spa_feature_decr(spa, SPA_FEATURE_LIVELIST, tx);
	VERIFY0(zap_count(mos, zap_obj, &count));
	if (count == 0) {
	/* no more livelists to delete */
	VERIFY0(zap_remove(mos, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_DELETED_CLONES, tx));
	VERIFY0(zap_destroy(mos, zap_obj, tx));
	spa->spa_livelists_to_delete = 0;
	spa_notify_waiters(spa);
	}
	}

	/*
	* Load in the value for the livelist to be removed and open it. Then,
	* load its first sublist and determine which block pointers should actually
	* be freed. Then, call a synctask which performs the actual frees and updates
	* the pool-wide livelist data.
	*/
	/* ARGSUSED */
	static void
	spa_livelist_delete_cb(void arg, zthr_t z)
	{
	spa_t *spa = arg;
	uint64_t ll_obj = 0, count;
	objset_t *mos = spa->spa_meta_objset;
	uint64_t zap_obj = spa->spa_livelists_to_delete;
	/*
	* Determine the next livelist to delete. This function should only
	* be called if there is at least one deleted clone.
	*/
	VERIFY0(dsl_get_next_livelist_obj(mos, zap_obj, &ll_obj));
	VERIFY0(zap_count(mos, ll_obj, &count));
	if (count > 0) {
	dsl_deadlist_t *ll;
	dsl_deadlist_entry_t *dle;
	bplist_t to_free;
	ll = kmem_zalloc(sizeof (dsl_deadlist_t), KM_SLEEP);
	dsl_deadlist_open(ll, mos, ll_obj);
	dle = dsl_deadlist_first(ll);
	ASSERT3P(dle, !=, NULL);
	bplist_create(&to_free);
	int err = dsl_process_sub_livelist(&dle->dle_bpobj, &to_free,
	z, NULL);
	if (err == 0) {
	sublist_delete_arg_t sync_arg = {
	.spa = spa,
	.ll = ll,
	.key = dle->dle_mintxg,
	.to_free = &to_free
	};
	zfs_dbgmsg("deleting sublist (id %llu) from"
	" livelist %llu, %lld remaining",
	(u_longlong_t)dle->dle_bpobj.bpo_object,
	(u_longlong_t)ll_obj, (longlong_t)count - 1);
	VERIFY0(dsl_sync_task(spa_name(spa), NULL,
	sublist_delete_sync, &sync_arg, 0,
	ZFS_SPACE_CHECK_DESTROY));
	} else {
	VERIFY3U(err, ==, EINTR);
	}
	bplist_clear(&to_free);
	bplist_destroy(&to_free);
	dsl_deadlist_close(ll);
	kmem_free(ll, sizeof (dsl_deadlist_t));
	} else {
	livelist_delete_arg_t sync_arg = {
	.spa = spa,
	.ll_obj = ll_obj,
	.zap_obj = zap_obj
	};
	zfs_dbgmsg("deletion of livelist %llu completed",
	(u_longlong_t)ll_obj);
	VERIFY0(dsl_sync_task(spa_name(spa), NULL, livelist_delete_sync,
	&sync_arg, 0, ZFS_SPACE_CHECK_DESTROY));
	}
	}

	static void
	spa_start_livelist_destroy_thread(spa_t *spa)
	{
	ASSERT3P(spa->spa_livelist_delete_zthr, ==, NULL);
	spa->spa_livelist_delete_zthr =
	zthr_create("z_livelist_destroy",
	- spa_livelist_delete_cb_check, spa_livelist_delete_cb, spa);
	+ spa_livelist_delete_cb_check, spa_livelist_delete_cb, spa,
	+ minclsyspri);
	}

	typedef struct livelist_new_arg {
	bplist_t *allocs;
	bplist_t *frees;
	} livelist_new_arg_t;

	static int
	livelist_track_new_cb(void arg, const blkptr_t bp, boolean_t bp_freed,
	dmu_tx_t *tx)
	{
	ASSERT(tx == NULL);
	livelist_new_arg_t *lna = arg;
	if (bp_freed) {
	bplist_append(lna->frees, bp);
	} else {
	bplist_append(lna->allocs, bp);
	zfs_livelist_condense_new_alloc++;
	}
	return (0);
	}

	typedef struct livelist_condense_arg {
	spa_t *spa;
	bplist_t to_keep;
	uint64_t first_size;
	uint64_t next_size;
	} livelist_condense_arg_t;

	static void
	spa_livelist_condense_sync(void arg, dmu_tx_t tx)
	{
	livelist_condense_arg_t *lca = arg;
	spa_t *spa = lca->spa;
	bplist_t new_frees;
	dsl_dataset_t *ds = spa->spa_to_condense.ds;

	/* Have we been cancelled? */
	if (spa->spa_to_condense.cancelled) {
	zfs_livelist_condense_sync_cancel++;
	goto out;
	}

	dsl_deadlist_entry_t *first = spa->spa_to_condense.first;
	dsl_deadlist_entry_t *next = spa->spa_to_condense.next;
	dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist;

	/*
	* It's possible that the livelist was changed while the zthr was
	* running. Therefore, we need to check for new blkptrs in the two
	* entries being condensed and continue to track them in the livelist.
	* Because of the way we handle remapped blkptrs (see dbuf_remap_impl),
	* it's possible that the newly added blkptrs are FREEs or ALLOCs so
	* we need to sort them into two different bplists.
	*/
	uint64_t first_obj = first->dle_bpobj.bpo_object;
	uint64_t next_obj = next->dle_bpobj.bpo_object;
	uint64_t cur_first_size = first->dle_bpobj.bpo_phys->bpo_num_blkptrs;
	uint64_t cur_next_size = next->dle_bpobj.bpo_phys->bpo_num_blkptrs;

	bplist_create(&new_frees);
	livelist_new_arg_t new_bps = {
	.allocs = &lca->to_keep,
	.frees = &new_frees,
	};

	if (cur_first_size > lca->first_size) {
	VERIFY0(livelist_bpobj_iterate_from_nofree(&first->dle_bpobj,
	livelist_track_new_cb, &new_bps, lca->first_size));
	}
	if (cur_next_size > lca->next_size) {
	VERIFY0(livelist_bpobj_iterate_from_nofree(&next->dle_bpobj,
	livelist_track_new_cb, &new_bps, lca->next_size));
	}

	dsl_deadlist_clear_entry(first, ll, tx);
	ASSERT(bpobj_is_empty(&first->dle_bpobj));
	dsl_deadlist_remove_entry(ll, next->dle_mintxg, tx);

	bplist_iterate(&lca->to_keep, dsl_deadlist_insert_alloc_cb, ll, tx);
	bplist_iterate(&new_frees, dsl_deadlist_insert_free_cb, ll, tx);
	bplist_destroy(&new_frees);

	char dsname[ZFS_MAX_DATASET_NAME_LEN];
	dsl_dataset_name(ds, dsname);
	zfs_dbgmsg("txg %llu condensing livelist of %s (id %llu), bpobj %llu "
	"(%llu blkptrs) and bpobj %llu (%llu blkptrs) -> bpobj %llu "
	"(%llu blkptrs)", (u_longlong_t)tx->tx_txg, dsname,
	(u_longlong_t)ds->ds_object, (u_longlong_t)first_obj,
	(u_longlong_t)cur_first_size, (u_longlong_t)next_obj,
	(u_longlong_t)cur_next_size,
	(u_longlong_t)first->dle_bpobj.bpo_object,
	(u_longlong_t)first->dle_bpobj.bpo_phys->bpo_num_blkptrs);
	out:
	dmu_buf_rele(ds->ds_dbuf, spa);
	spa->spa_to_condense.ds = NULL;
	bplist_clear(&lca->to_keep);
	bplist_destroy(&lca->to_keep);
	kmem_free(lca, sizeof (livelist_condense_arg_t));
	spa->spa_to_condense.syncing = B_FALSE;
	}

	static void
	spa_livelist_condense_cb(void arg, zthr_t t)
	{
	while (zfs_livelist_condense_zthr_pause &&
	!(zthr_has_waiters(t) \|\| zthr_iscancelled(t)))
	delay(1);

	spa_t *spa = arg;
	dsl_deadlist_entry_t *first = spa->spa_to_condense.first;
	dsl_deadlist_entry_t *next = spa->spa_to_condense.next;
	uint64_t first_size, next_size;

	livelist_condense_arg_t *lca =
	kmem_alloc(sizeof (livelist_condense_arg_t), KM_SLEEP);
	bplist_create(&lca->to_keep);

	/*
	* Process the livelists (matching FREEs and ALLOCs) in open context
	* so we have minimal work in syncing context to condense.
	*
	* We save bpobj sizes (first_size and next_size) to use later in
	* syncing context to determine if entries were added to these sublists
	* while in open context. This is possible because the clone is still
	* active and open for normal writes and we want to make sure the new,
	* unprocessed blockpointers are inserted into the livelist normally.
	*
	* Note that dsl_process_sub_livelist() both stores the size number of
	* blockpointers and iterates over them while the bpobj's lock held, so
	* the sizes returned to us are consistent which what was actually
	* processed.
	*/
	int err = dsl_process_sub_livelist(&first->dle_bpobj, &lca->to_keep, t,
	&first_size);
	if (err == 0)
	err = dsl_process_sub_livelist(&next->dle_bpobj, &lca->to_keep,
	t, &next_size);

	if (err == 0) {
	while (zfs_livelist_condense_sync_pause &&
	!(zthr_has_waiters(t) \|\| zthr_iscancelled(t)))
	delay(1);

	dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
	dmu_tx_mark_netfree(tx);
	dmu_tx_hold_space(tx, 1);
	err = dmu_tx_assign(tx, TXG_NOWAIT \| TXG_NOTHROTTLE);
	if (err == 0) {
	/*
	* Prevent the condense zthr restarting before
	* the synctask completes.
	*/
	spa->spa_to_condense.syncing = B_TRUE;
	lca->spa = spa;
	lca->first_size = first_size;
	lca->next_size = next_size;
	dsl_sync_task_nowait(spa_get_dsl(spa),
	spa_livelist_condense_sync, lca, tx);
	dmu_tx_commit(tx);
	return;
	}
	}
	/*
	* Condensing can not continue: either it was externally stopped or
	* we were unable to assign to a tx because the pool has run out of
	* space. In the second case, we'll just end up trying to condense
	* again in a later txg.
	*/
	ASSERT(err != 0);
	bplist_clear(&lca->to_keep);
	bplist_destroy(&lca->to_keep);
	kmem_free(lca, sizeof (livelist_condense_arg_t));
	dmu_buf_rele(spa->spa_to_condense.ds->ds_dbuf, spa);
	spa->spa_to_condense.ds = NULL;
	if (err == EINTR)
	zfs_livelist_condense_zthr_cancel++;
	}

	/* ARGSUSED */
	/*
	* Check that there is something to condense but that a condense is not
	* already in progress and that condensing has not been cancelled.
	*/
	static boolean_t
	spa_livelist_condense_cb_check(void arg, zthr_t z)
	{
	spa_t *spa = arg;
	if ((spa->spa_to_condense.ds != NULL) &&
	(spa->spa_to_condense.syncing == B_FALSE) &&
	(spa->spa_to_condense.cancelled == B_FALSE)) {
	return (B_TRUE);
	}
	return (B_FALSE);
	}

	static void
	spa_start_livelist_condensing_thread(spa_t *spa)
	{
	spa->spa_to_condense.ds = NULL;
	spa->spa_to_condense.first = NULL;
	spa->spa_to_condense.next = NULL;
	spa->spa_to_condense.syncing = B_FALSE;
	spa->spa_to_condense.cancelled = B_FALSE;

	ASSERT3P(spa->spa_livelist_condense_zthr, ==, NULL);
	spa->spa_livelist_condense_zthr =
	zthr_create("z_livelist_condense",
	spa_livelist_condense_cb_check,
	- spa_livelist_condense_cb, spa);
	+ spa_livelist_condense_cb, spa, minclsyspri);
	}

	static void
	spa_spawn_aux_threads(spa_t *spa)
	{
	ASSERT(spa_writeable(spa));

	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	spa_start_indirect_condensing_thread(spa);
	spa_start_livelist_destroy_thread(spa);
	spa_start_livelist_condensing_thread(spa);

	ASSERT3P(spa->spa_checkpoint_discard_zthr, ==, NULL);
	spa->spa_checkpoint_discard_zthr =
	zthr_create("z_checkpoint_discard",
	spa_checkpoint_discard_thread_check,
	- spa_checkpoint_discard_thread, spa);
	+ spa_checkpoint_discard_thread, spa, minclsyspri);
	}

	/*
	* Fix up config after a partly-completed split. This is done with the
	* ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off
	* pool have that entry in their config, but only the splitting one contains
	* a list of all the guids of the vdevs that are being split off.
	*
	* This function determines what to do with that list: either rejoin
	* all the disks to the pool, or complete the splitting process. To attempt
	* the rejoin, each disk that is offlined is marked online again, and
	* we do a reopen() call. If the vdev label for every disk that was
	* marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL)
	* then we call vdev_split() on each disk, and complete the split.
	*
	* Otherwise we leave the config alone, with all the vdevs in place in
	* the original pool.
	*/
	static void
	spa_try_repair(spa_t spa, nvlist_t config)
	{
	uint_t extracted;
	uint64_t *glist;
	uint_t i, gcount;
	nvlist_t *nvl;
	vdev_t **vd;
	boolean_t attempt_reopen;

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0)
	return;

	/* check that the config is complete */
	if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST,
	&glist, &gcount) != 0)
	return;

	vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP);

	/* attempt to online all the vdevs & validate */
	attempt_reopen = B_TRUE;
	for (i = 0; i < gcount; i++) {
	if (glist[i] == 0) /* vdev is hole */
	continue;

	vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE);
	if (vd[i] == NULL) {
	/*
	* Don't bother attempting to reopen the disks;
	* just do the split.
	*/
	attempt_reopen = B_FALSE;
	} else {
	/* attempt to re-online it */
	vd[i]->vdev_offline = B_FALSE;
	}
	}

	if (attempt_reopen) {
	vdev_reopen(spa->spa_root_vdev);

	/* check each device to see what state it's in */
	for (extracted = 0, i = 0; i < gcount; i++) {
	if (vd[i] != NULL &&
	vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL)
	break;
	++extracted;
	}
	}

	/*
	* If every disk has been moved to the new pool, or if we never
	* even attempted to look at them, then we split them off for
	* good.
	*/
	if (!attempt_reopen \|\| gcount == extracted) {
	for (i = 0; i < gcount; i++)
	if (vd[i] != NULL)
	vdev_split(vd[i]);
	vdev_reopen(spa->spa_root_vdev);
	}

	kmem_free(vd, gcount * sizeof (vdev_t *));
	}

	static int
	spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type)
	{
	char *ereport = FM_EREPORT_ZFS_POOL;
	int error;

	spa->spa_load_state = state;
	(void) spa_import_progress_set_state(spa_guid(spa),
	spa_load_state(spa));

	gethrestime(&spa->spa_loaded_ts);
	error = spa_load_impl(spa, type, &ereport);

	/*
	* Don't count references from objsets that are already closed
	* and are making their way through the eviction process.
	*/
	spa_evicting_os_wait(spa);
	spa->spa_minref = zfs_refcount_count(&spa->spa_refcount);
	if (error) {
	if (error != EEXIST) {
	spa->spa_loaded_ts.tv_sec = 0;
	spa->spa_loaded_ts.tv_nsec = 0;
	}
	if (error != EBADF) {
	(void) zfs_ereport_post(ereport, spa,
	NULL, NULL, NULL, 0);
	}
	}
	spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE;
	spa->spa_ena = 0;

	(void) spa_import_progress_set_state(spa_guid(spa),
	spa_load_state(spa));

	return (error);
	}

	#ifdef ZFS_DEBUG
	/*
	* Count the number of per-vdev ZAPs associated with all of the vdevs in the
	* vdev tree rooted in the given vd, and ensure that each ZAP is present in the
	* spa's per-vdev ZAP list.
	*/
	static uint64_t
	vdev_count_verify_zaps(vdev_t *vd)
	{
	spa_t *spa = vd->vdev_spa;
	uint64_t total = 0;

	if (vd->vdev_top_zap != 0) {
	total++;
	ASSERT0(zap_lookup_int(spa->spa_meta_objset,
	spa->spa_all_vdev_zaps, vd->vdev_top_zap));
	}
	if (vd->vdev_leaf_zap != 0) {
	total++;
	ASSERT0(zap_lookup_int(spa->spa_meta_objset,
	spa->spa_all_vdev_zaps, vd->vdev_leaf_zap));
	}

	for (uint64_t i = 0; i < vd->vdev_children; i++) {
	total += vdev_count_verify_zaps(vd->vdev_child[i]);
	}

	return (total);
	}
	#endif

	/*
	* Determine whether the activity check is required.
	*/
	static boolean_t
	spa_activity_check_required(spa_t spa, uberblock_t ub, nvlist_t *label,
	nvlist_t *config)
	{
	uint64_t state = 0;
	uint64_t hostid = 0;
	uint64_t tryconfig_txg = 0;
	uint64_t tryconfig_timestamp = 0;
	uint16_t tryconfig_mmp_seq = 0;
	nvlist_t *nvinfo;

	if (nvlist_exists(config, ZPOOL_CONFIG_LOAD_INFO)) {
	nvinfo = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO);
	(void) nvlist_lookup_uint64(nvinfo, ZPOOL_CONFIG_MMP_TXG,
	&tryconfig_txg);
	(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_TIMESTAMP,
	&tryconfig_timestamp);
	(void) nvlist_lookup_uint16(nvinfo, ZPOOL_CONFIG_MMP_SEQ,
	&tryconfig_mmp_seq);
	}

	(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, &state);

	/*
	* Disable the MMP activity check - This is used by zdb which
	* is intended to be used on potentially active pools.
	*/
	if (spa->spa_import_flags & ZFS_IMPORT_SKIP_MMP)
	return (B_FALSE);

	/*
	* Skip the activity check when the MMP feature is disabled.
	*/
	if (ub->ub_mmp_magic == MMP_MAGIC && ub->ub_mmp_delay == 0)
	return (B_FALSE);

	/*
	* If the tryconfig_ values are nonzero, they are the results of an
	* earlier tryimport. If they all match the uberblock we just found,
	* then the pool has not changed and we return false so we do not test
	* a second time.
	*/
	if (tryconfig_txg && tryconfig_txg == ub->ub_txg &&
	tryconfig_timestamp && tryconfig_timestamp == ub->ub_timestamp &&
	tryconfig_mmp_seq && tryconfig_mmp_seq ==
	(MMP_SEQ_VALID(ub) ? MMP_SEQ(ub) : 0))
	return (B_FALSE);

	/*
	* Allow the activity check to be skipped when importing the pool
	* on the same host which last imported it. Since the hostid from
	* configuration may be stale use the one read from the label.
	*/
	if (nvlist_exists(label, ZPOOL_CONFIG_HOSTID))
	hostid = fnvlist_lookup_uint64(label, ZPOOL_CONFIG_HOSTID);

	if (hostid == spa_get_hostid(spa))
	return (B_FALSE);

	/*
	* Skip the activity test when the pool was cleanly exported.
	*/
	if (state != POOL_STATE_ACTIVE)
	return (B_FALSE);

	return (B_TRUE);
	}

	/*
	* Nanoseconds the activity check must watch for changes on-disk.
	*/
	static uint64_t
	spa_activity_check_duration(spa_t spa, uberblock_t ub)
	{
	uint64_t import_intervals = MAX(zfs_multihost_import_intervals, 1);
	uint64_t multihost_interval = MSEC2NSEC(
	MMP_INTERVAL_OK(zfs_multihost_interval));
	uint64_t import_delay = MAX(NANOSEC, import_intervals *
	multihost_interval);

	/*
	* Local tunables determine a minimum duration except for the case
	* where we know when the remote host will suspend the pool if MMP
	* writes do not land.
	*
	* See Big Theory comment at the top of mmp.c for the reasoning behind
	* these cases and times.
	*/

	ASSERT(MMP_IMPORT_SAFETY_FACTOR >= 100);

	if (MMP_INTERVAL_VALID(ub) && MMP_FAIL_INT_VALID(ub) &&
	MMP_FAIL_INT(ub) > 0) {

	/* MMP on remote host will suspend pool after failed writes */
	import_delay = MMP_FAIL_INT(ub) * MSEC2NSEC(MMP_INTERVAL(ub)) *
	MMP_IMPORT_SAFETY_FACTOR / 100;

	zfs_dbgmsg("fail_intvals>0 import_delay=%llu ub_mmp "
	"mmp_fails=%llu ub_mmp mmp_interval=%llu "
	"import_intervals=%llu", (u_longlong_t)import_delay,
	(u_longlong_t)MMP_FAIL_INT(ub),
	(u_longlong_t)MMP_INTERVAL(ub),
	(u_longlong_t)import_intervals);

	} else if (MMP_INTERVAL_VALID(ub) && MMP_FAIL_INT_VALID(ub) &&
	MMP_FAIL_INT(ub) == 0) {

	/* MMP on remote host will never suspend pool */
	import_delay = MAX(import_delay, (MSEC2NSEC(MMP_INTERVAL(ub)) +
	ub->ub_mmp_delay) * import_intervals);

	zfs_dbgmsg("fail_intvals=0 import_delay=%llu ub_mmp "
	"mmp_interval=%llu ub_mmp_delay=%llu "
	"import_intervals=%llu", (u_longlong_t)import_delay,
	(u_longlong_t)MMP_INTERVAL(ub),
	(u_longlong_t)ub->ub_mmp_delay,
	(u_longlong_t)import_intervals);

	} else if (MMP_VALID(ub)) {
	/*
	* zfs-0.7 compatibility case
	*/

	import_delay = MAX(import_delay, (multihost_interval +
	ub->ub_mmp_delay) * import_intervals);

	zfs_dbgmsg("import_delay=%llu ub_mmp_delay=%llu "
	"import_intervals=%llu leaves=%u",
	(u_longlong_t)import_delay,
	(u_longlong_t)ub->ub_mmp_delay,
	(u_longlong_t)import_intervals,
	vdev_count_leaves(spa));
	} else {
	/* Using local tunings is the only reasonable option */
	zfs_dbgmsg("pool last imported on non-MMP aware "
	"host using import_delay=%llu multihost_interval=%llu "
	"import_intervals=%llu", (u_longlong_t)import_delay,
	(u_longlong_t)multihost_interval,
	(u_longlong_t)import_intervals);
	}

	return (import_delay);
	}

	/*
	* Perform the import activity check. If the user canceled the import or
	* we detected activity then fail.
	*/
	static int
	spa_activity_check(spa_t spa, uberblock_t ub, nvlist_t *config)
	{
	uint64_t txg = ub->ub_txg;
	uint64_t timestamp = ub->ub_timestamp;
	uint64_t mmp_config = ub->ub_mmp_config;
	uint16_t mmp_seq = MMP_SEQ_VALID(ub) ? MMP_SEQ(ub) : 0;
	uint64_t import_delay;
	hrtime_t import_expire;
	nvlist_t *mmp_label = NULL;
	vdev_t *rvd = spa->spa_root_vdev;
	kcondvar_t cv;
	kmutex_t mtx;
	int error = 0;

	cv_init(&cv, NULL, CV_DEFAULT, NULL);
	mutex_init(&mtx, NULL, MUTEX_DEFAULT, NULL);
	mutex_enter(&mtx);

	/*
	* If ZPOOL_CONFIG_MMP_TXG is present an activity check was performed
	* during the earlier tryimport. If the txg recorded there is 0 then
	* the pool is known to be active on another host.
	*
	* Otherwise, the pool might be in use on another host. Check for
	* changes in the uberblocks on disk if necessary.
	*/
	if (nvlist_exists(config, ZPOOL_CONFIG_LOAD_INFO)) {
	nvlist_t *nvinfo = fnvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_LOAD_INFO);

	if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_TXG) &&
	fnvlist_lookup_uint64(nvinfo, ZPOOL_CONFIG_MMP_TXG) == 0) {
	vdev_uberblock_load(rvd, ub, &mmp_label);
	error = SET_ERROR(EREMOTEIO);
	goto out;
	}
	}

	import_delay = spa_activity_check_duration(spa, ub);

	/* Add a small random factor in case of simultaneous imports (0-25%) */
	- import_delay += import_delay * spa_get_random(250) / 1000;
	+ import_delay += import_delay * random_in_range(250) / 1000;

	import_expire = gethrtime() + import_delay;

	while (gethrtime() < import_expire) {
	(void) spa_import_progress_set_mmp_check(spa_guid(spa),
	NSEC2SEC(import_expire - gethrtime()));

	vdev_uberblock_load(rvd, ub, &mmp_label);

	if (txg != ub->ub_txg \|\| timestamp != ub->ub_timestamp \|\|
	mmp_seq != (MMP_SEQ_VALID(ub) ? MMP_SEQ(ub) : 0)) {
	zfs_dbgmsg("multihost activity detected "
	"txg %llu ub_txg %llu "
	"timestamp %llu ub_timestamp %llu "
	"mmp_config %#llx ub_mmp_config %#llx",
	(u_longlong_t)txg, (u_longlong_t)ub->ub_txg,
	(u_longlong_t)timestamp,
	(u_longlong_t)ub->ub_timestamp,
	(u_longlong_t)mmp_config,
	(u_longlong_t)ub->ub_mmp_config);

	error = SET_ERROR(EREMOTEIO);
	break;
	}

	if (mmp_label) {
	nvlist_free(mmp_label);
	mmp_label = NULL;
	}

	error = cv_timedwait_sig(&cv, &mtx, ddi_get_lbolt() + hz);
	if (error != -1) {
	error = SET_ERROR(EINTR);
	break;
	}
	error = 0;
	}

	out:
	mutex_exit(&mtx);
	mutex_destroy(&mtx);
	cv_destroy(&cv);

	/*
	* If the pool is determined to be active store the status in the
	* spa->spa_load_info nvlist. If the remote hostname or hostid are
	* available from configuration read from disk store them as well.
	* This allows 'zpool import' to generate a more useful message.
	*
	* ZPOOL_CONFIG_MMP_STATE - observed pool status (mandatory)
	* ZPOOL_CONFIG_MMP_HOSTNAME - hostname from the active pool
	* ZPOOL_CONFIG_MMP_HOSTID - hostid from the active pool
	*/
	if (error == EREMOTEIO) {
	char *hostname = "<unknown>";
	uint64_t hostid = 0;

	if (mmp_label) {
	if (nvlist_exists(mmp_label, ZPOOL_CONFIG_HOSTNAME)) {
	hostname = fnvlist_lookup_string(mmp_label,
	ZPOOL_CONFIG_HOSTNAME);
	fnvlist_add_string(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_HOSTNAME, hostname);
	}

	if (nvlist_exists(mmp_label, ZPOOL_CONFIG_HOSTID)) {
	hostid = fnvlist_lookup_uint64(mmp_label,
	ZPOOL_CONFIG_HOSTID);
	fnvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_HOSTID, hostid);
	}
	}

	fnvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_STATE, MMP_STATE_ACTIVE);
	fnvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_TXG, 0);

	error = spa_vdev_err(rvd, VDEV_AUX_ACTIVE, EREMOTEIO);
	}

	if (mmp_label)
	nvlist_free(mmp_label);

	return (error);
	}

	static int
	spa_verify_host(spa_t spa, nvlist_t mos_config)
	{
	uint64_t hostid;
	char *hostname;
	uint64_t myhostid = 0;

	if (!spa_is_root(spa) && nvlist_lookup_uint64(mos_config,
	ZPOOL_CONFIG_HOSTID, &hostid) == 0) {
	hostname = fnvlist_lookup_string(mos_config,
	ZPOOL_CONFIG_HOSTNAME);

	myhostid = zone_get_hostid(NULL);

	if (hostid != 0 && myhostid != 0 && hostid != myhostid) {
	cmn_err(CE_WARN, "pool '%s' could not be "
	"loaded as it was last accessed by "
	"another system (host: %s hostid: 0x%llx). "
	"See: https://openzfs.github.io/openzfs-docs/msg/"
	"ZFS-8000-EY",
	spa_name(spa), hostname, (u_longlong_t)hostid);
	spa_load_failed(spa, "hostid verification failed: pool "
	"last accessed by host: %s (hostid: 0x%llx)",
	hostname, (u_longlong_t)hostid);
	return (SET_ERROR(EBADF));
	}
	}

	return (0);
	}

	static int
	spa_ld_parse_config(spa_t *spa, spa_import_type_t type)
	{
	int error = 0;
	nvlist_t nvtree, nvl, *config = spa->spa_config;
	int parse;
	vdev_t *rvd;
	uint64_t pool_guid;
	char *comment;
	char *compatibility;

	/*
	* Versioning wasn't explicitly added to the label until later, so if
	* it's not present treat it as the initial version.
	*/
	if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
	&spa->spa_ubsync.ub_version) != 0)
	spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL;

	if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) {
	spa_load_failed(spa, "invalid config provided: '%s' missing",
	ZPOOL_CONFIG_POOL_GUID);
	return (SET_ERROR(EINVAL));
	}

	/*
	* If we are doing an import, ensure that the pool is not already
	* imported by checking if its pool guid already exists in the
	* spa namespace.
	*
	* The only case that we allow an already imported pool to be
	* imported again, is when the pool is checkpointed and we want to
	* look at its checkpointed state from userland tools like zdb.
	*/
	#ifdef _KERNEL
	if ((spa->spa_load_state == SPA_LOAD_IMPORT \|\|
	spa->spa_load_state == SPA_LOAD_TRYIMPORT) &&
	spa_guid_exists(pool_guid, 0)) {
	#else
	if ((spa->spa_load_state == SPA_LOAD_IMPORT \|\|
	spa->spa_load_state == SPA_LOAD_TRYIMPORT) &&
	spa_guid_exists(pool_guid, 0) &&
	!spa_importing_readonly_checkpoint(spa)) {
	#endif
	spa_load_failed(spa, "a pool with guid %llu is already open",
	(u_longlong_t)pool_guid);
	return (SET_ERROR(EEXIST));
	}

	spa->spa_config_guid = pool_guid;

	nvlist_free(spa->spa_load_info);
	spa->spa_load_info = fnvlist_alloc();

	ASSERT(spa->spa_comment == NULL);
	if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0)
	spa->spa_comment = spa_strdup(comment);

	ASSERT(spa->spa_compatibility == NULL);
	if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMPATIBILITY,
	&compatibility) == 0)
	spa->spa_compatibility = spa_strdup(compatibility);

	(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG,
	&spa->spa_config_txg);

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) == 0)
	spa->spa_config_splitting = fnvlist_dup(nvl);

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvtree)) {
	spa_load_failed(spa, "invalid config provided: '%s' missing",
	ZPOOL_CONFIG_VDEV_TREE);
	return (SET_ERROR(EINVAL));
	}

	/*
	* Create "The Godfather" zio to hold all async IOs
	*/
	spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *),
	KM_SLEEP);
	for (int i = 0; i < max_ncpus; i++) {
	spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE \|
	ZIO_FLAG_GODFATHER);
	}

	/*
	* Parse the configuration into a vdev tree. We explicitly set the
	* value that will be returned by spa_version() since parsing the
	* configuration requires knowing the version number.
	*/
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	parse = (type == SPA_IMPORT_EXISTING ?
	VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT);
	error = spa_config_parse(spa, &rvd, nvtree, NULL, 0, parse);
	spa_config_exit(spa, SCL_ALL, FTAG);

	if (error != 0) {
	spa_load_failed(spa, "unable to parse config [error=%d]",
	error);
	return (error);
	}

	ASSERT(spa->spa_root_vdev == rvd);
	ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT);
	ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT);

	if (type != SPA_IMPORT_ASSEMBLE) {
	ASSERT(spa_guid(spa) == pool_guid);
	}

	return (0);
	}

	/*
	* Recursively open all vdevs in the vdev tree. This function is called twice:
	* first with the untrusted config, then with the trusted config.
	*/
	static int
	spa_ld_open_vdevs(spa_t *spa)
	{
	int error = 0;

	/*
	* spa_missing_tvds_allowed defines how many top-level vdevs can be
	* missing/unopenable for the root vdev to be still considered openable.
	*/
	if (spa->spa_trust_config) {
	spa->spa_missing_tvds_allowed = zfs_max_missing_tvds;
	} else if (spa->spa_config_source == SPA_CONFIG_SRC_CACHEFILE) {
	spa->spa_missing_tvds_allowed = zfs_max_missing_tvds_cachefile;
	} else if (spa->spa_config_source == SPA_CONFIG_SRC_SCAN) {
	spa->spa_missing_tvds_allowed = zfs_max_missing_tvds_scan;
	} else {
	spa->spa_missing_tvds_allowed = 0;
	}

	spa->spa_missing_tvds_allowed =
	MAX(zfs_max_missing_tvds, spa->spa_missing_tvds_allowed);

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	error = vdev_open(spa->spa_root_vdev);
	spa_config_exit(spa, SCL_ALL, FTAG);

	if (spa->spa_missing_tvds != 0) {
	spa_load_note(spa, "vdev tree has %lld missing top-level "
	"vdevs.", (u_longlong_t)spa->spa_missing_tvds);
	if (spa->spa_trust_config && (spa->spa_mode & SPA_MODE_WRITE)) {
	/*
	* Although theoretically we could allow users to open
	* incomplete pools in RW mode, we'd need to add a lot
	* of extra logic (e.g. adjust pool space to account
	* for missing vdevs).
	* This limitation also prevents users from accidentally
	* opening the pool in RW mode during data recovery and
	* damaging it further.
	*/
	spa_load_note(spa, "pools with missing top-level "
	"vdevs can only be opened in read-only mode.");
	error = SET_ERROR(ENXIO);
	} else {
	spa_load_note(spa, "current settings allow for maximum "
	"%lld missing top-level vdevs at this stage.",
	(u_longlong_t)spa->spa_missing_tvds_allowed);
	}
	}
	if (error != 0) {
	spa_load_failed(spa, "unable to open vdev tree [error=%d]",
	error);
	}
	if (spa->spa_missing_tvds != 0 \|\| error != 0)
	vdev_dbgmsg_print_tree(spa->spa_root_vdev, 2);

	return (error);
	}

	/*
	* We need to validate the vdev labels against the configuration that
	* we have in hand. This function is called twice: first with an untrusted
	* config, then with a trusted config. The validation is more strict when the
	* config is trusted.
	*/
	static int
	spa_ld_validate_vdevs(spa_t *spa)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	error = vdev_validate(rvd);
	spa_config_exit(spa, SCL_ALL, FTAG);

	if (error != 0) {
	spa_load_failed(spa, "vdev_validate failed [error=%d]", error);
	return (error);
	}

	if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) {
	spa_load_failed(spa, "cannot open vdev tree after invalidating "
	"some vdevs");
	vdev_dbgmsg_print_tree(rvd, 2);
	return (SET_ERROR(ENXIO));
	}

	return (0);
	}

	static void
	spa_ld_select_uberblock_done(spa_t spa, uberblock_t ub)
	{
	spa->spa_state = POOL_STATE_ACTIVE;
	spa->spa_ubsync = spa->spa_uberblock;
	spa->spa_verify_min_txg = spa->spa_extreme_rewind ?
	TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1;
	spa->spa_first_txg = spa->spa_last_ubsync_txg ?
	spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1;
	spa->spa_claim_max_txg = spa->spa_first_txg;
	spa->spa_prev_software_version = ub->ub_software_version;
	}

	static int
	spa_ld_select_uberblock(spa_t *spa, spa_import_type_t type)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	nvlist_t *label;
	uberblock_t *ub = &spa->spa_uberblock;
	boolean_t activity_check = B_FALSE;

	/*
	* If we are opening the checkpointed state of the pool by
	* rewinding to it, at this point we will have written the
	* checkpointed uberblock to the vdev labels, so searching
	* the labels will find the right uberblock. However, if
	* we are opening the checkpointed state read-only, we have
	* not modified the labels. Therefore, we must ignore the
	* labels and continue using the spa_uberblock that was set
	* by spa_ld_checkpoint_rewind.
	*
	* Note that it would be fine to ignore the labels when
	* rewinding (opening writeable) as well. However, if we
	* crash just after writing the labels, we will end up
	* searching the labels. Doing so in the common case means
	* that this code path gets exercised normally, rather than
	* just in the edge case.
	*/
	if (ub->ub_checkpoint_txg != 0 &&
	spa_importing_readonly_checkpoint(spa)) {
	spa_ld_select_uberblock_done(spa, ub);
	return (0);
	}

	/*
	* Find the best uberblock.
	*/
	vdev_uberblock_load(rvd, ub, &label);

	/*
	* If we weren't able to find a single valid uberblock, return failure.
	*/
	if (ub->ub_txg == 0) {
	nvlist_free(label);
	spa_load_failed(spa, "no valid uberblock found");
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO));
	}

	if (spa->spa_load_max_txg != UINT64_MAX) {
	(void) spa_import_progress_set_max_txg(spa_guid(spa),
	(u_longlong_t)spa->spa_load_max_txg);
	}
	spa_load_note(spa, "using uberblock with txg=%llu",
	(u_longlong_t)ub->ub_txg);


	/*
	* For pools which have the multihost property on determine if the
	* pool is truly inactive and can be safely imported. Prevent
	* hosts which don't have a hostid set from importing the pool.
	*/
	activity_check = spa_activity_check_required(spa, ub, label,
	spa->spa_config);
	if (activity_check) {
	if (ub->ub_mmp_magic == MMP_MAGIC && ub->ub_mmp_delay &&
	spa_get_hostid(spa) == 0) {
	nvlist_free(label);
	fnvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_STATE, MMP_STATE_NO_HOSTID);
	return (spa_vdev_err(rvd, VDEV_AUX_ACTIVE, EREMOTEIO));
	}

	int error = spa_activity_check(spa, ub, spa->spa_config);
	if (error) {
	nvlist_free(label);
	return (error);
	}

	fnvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_STATE, MMP_STATE_INACTIVE);
	fnvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_TXG, ub->ub_txg);
	fnvlist_add_uint16(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_SEQ,
	(MMP_SEQ_VALID(ub) ? MMP_SEQ(ub) : 0));
	}

	/*
	* If the pool has an unsupported version we can't open it.
	*/
	if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) {
	nvlist_free(label);
	spa_load_failed(spa, "version %llu is not supported",
	(u_longlong_t)ub->ub_version);
	return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP));
	}

	if (ub->ub_version >= SPA_VERSION_FEATURES) {
	nvlist_t *features;

	/*
	* If we weren't able to find what's necessary for reading the
	* MOS in the label, return failure.
	*/
	if (label == NULL) {
	spa_load_failed(spa, "label config unavailable");
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA,
	ENXIO));
	}

	if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_FEATURES_FOR_READ,
	&features) != 0) {
	nvlist_free(label);
	spa_load_failed(spa, "invalid label: '%s' missing",
	ZPOOL_CONFIG_FEATURES_FOR_READ);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA,
	ENXIO));
	}

	/*
	* Update our in-core representation with the definitive values
	* from the label.
	*/
	nvlist_free(spa->spa_label_features);
	VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0);
	}

	nvlist_free(label);

	/*
	* Look through entries in the label nvlist's features_for_read. If
	* there is a feature listed there which we don't understand then we
	* cannot open a pool.
	*/
	if (ub->ub_version >= SPA_VERSION_FEATURES) {
	nvlist_t *unsup_feat;

	VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) ==
	0);

	for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features,
	NULL); nvp != NULL;
	nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) {
	if (!zfeature_is_supported(nvpair_name(nvp))) {
	VERIFY(nvlist_add_string(unsup_feat,
	nvpair_name(nvp), "") == 0);
	}
	}

	if (!nvlist_empty(unsup_feat)) {
	VERIFY(nvlist_add_nvlist(spa->spa_load_info,
	ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0);
	nvlist_free(unsup_feat);
	spa_load_failed(spa, "some features are unsupported");
	return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT,
	ENOTSUP));
	}

	nvlist_free(unsup_feat);
	}

	if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) {
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	spa_try_repair(spa, spa->spa_config);
	spa_config_exit(spa, SCL_ALL, FTAG);
	nvlist_free(spa->spa_config_splitting);
	spa->spa_config_splitting = NULL;
	}

	/*
	* Initialize internal SPA structures.
	*/
	spa_ld_select_uberblock_done(spa, ub);

	return (0);
	}

	static int
	spa_ld_open_rootbp(spa_t *spa)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool);
	if (error != 0) {
	spa_load_failed(spa, "unable to open rootbp in dsl_pool_init "
	"[error=%d]", error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}
	spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset;

	return (0);
	}

	static int
	spa_ld_trusted_config(spa_t *spa, spa_import_type_t type,
	boolean_t reloading)
	{
	vdev_t mrvd, rvd = spa->spa_root_vdev;
	nvlist_t nv, mos_config, *policy;
	int error = 0, copy_error;
	uint64_t healthy_tvds, healthy_tvds_mos;
	uint64_t mos_config_txg;

	if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object, B_TRUE)
	!= 0)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

	/*
	* If we're assembling a pool from a split, the config provided is
	* already trusted so there is nothing to do.
	*/
	if (type == SPA_IMPORT_ASSEMBLE)
	return (0);

	healthy_tvds = spa_healthy_core_tvds(spa);

	if (load_nvlist(spa, spa->spa_config_object, &mos_config)
	!= 0) {
	spa_load_failed(spa, "unable to retrieve MOS config");
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	/*
	* If we are doing an open, pool owner wasn't verified yet, thus do
	* the verification here.
	*/
	if (spa->spa_load_state == SPA_LOAD_OPEN) {
	error = spa_verify_host(spa, mos_config);
	if (error != 0) {
	nvlist_free(mos_config);
	return (error);
	}
	}

	nv = fnvlist_lookup_nvlist(mos_config, ZPOOL_CONFIG_VDEV_TREE);

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);

	/*
	* Build a new vdev tree from the trusted config
	*/
	error = spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD);
	if (error != 0) {
	nvlist_free(mos_config);
	spa_config_exit(spa, SCL_ALL, FTAG);
	spa_load_failed(spa, "spa_config_parse failed [error=%d]",
	error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error));
	}

	/*
	* Vdev paths in the MOS may be obsolete. If the untrusted config was
	* obtained by scanning /dev/dsk, then it will have the right vdev
	* paths. We update the trusted MOS config with this information.
	* We first try to copy the paths with vdev_copy_path_strict, which
	* succeeds only when both configs have exactly the same vdev tree.
	* If that fails, we fall back to a more flexible method that has a
	* best effort policy.
	*/
	copy_error = vdev_copy_path_strict(rvd, mrvd);
	if (copy_error != 0 \|\| spa_load_print_vdev_tree) {
	spa_load_note(spa, "provided vdev tree:");
	vdev_dbgmsg_print_tree(rvd, 2);
	spa_load_note(spa, "MOS vdev tree:");
	vdev_dbgmsg_print_tree(mrvd, 2);
	}
	if (copy_error != 0) {
	spa_load_note(spa, "vdev_copy_path_strict failed, falling "
	"back to vdev_copy_path_relaxed");
	vdev_copy_path_relaxed(rvd, mrvd);
	}

	vdev_close(rvd);
	vdev_free(rvd);
	spa->spa_root_vdev = mrvd;
	rvd = mrvd;
	spa_config_exit(spa, SCL_ALL, FTAG);

	/*
	* We will use spa_config if we decide to reload the spa or if spa_load
	* fails and we rewind. We must thus regenerate the config using the
	* MOS information with the updated paths. ZPOOL_LOAD_POLICY is used to
	* pass settings on how to load the pool and is not stored in the MOS.
	* We copy it over to our new, trusted config.
	*/
	mos_config_txg = fnvlist_lookup_uint64(mos_config,
	ZPOOL_CONFIG_POOL_TXG);
	nvlist_free(mos_config);
	mos_config = spa_config_generate(spa, NULL, mos_config_txg, B_FALSE);
	if (nvlist_lookup_nvlist(spa->spa_config, ZPOOL_LOAD_POLICY,
	&policy) == 0)
	fnvlist_add_nvlist(mos_config, ZPOOL_LOAD_POLICY, policy);
	spa_config_set(spa, mos_config);
	spa->spa_config_source = SPA_CONFIG_SRC_MOS;

	/*
	* Now that we got the config from the MOS, we should be more strict
	* in checking blkptrs and can make assumptions about the consistency
	* of the vdev tree. spa_trust_config must be set to true before opening
	* vdevs in order for them to be writeable.
	*/
	spa->spa_trust_config = B_TRUE;

	/*
	* Open and validate the new vdev tree
	*/
	error = spa_ld_open_vdevs(spa);
	if (error != 0)
	return (error);

	error = spa_ld_validate_vdevs(spa);
	if (error != 0)
	return (error);

	if (copy_error != 0 \|\| spa_load_print_vdev_tree) {
	spa_load_note(spa, "final vdev tree:");
	vdev_dbgmsg_print_tree(rvd, 2);
	}

	if (spa->spa_load_state != SPA_LOAD_TRYIMPORT &&
	!spa->spa_extreme_rewind && zfs_max_missing_tvds == 0) {
	/*
	* Sanity check to make sure that we are indeed loading the
	* latest uberblock. If we missed SPA_SYNC_MIN_VDEVS tvds
	* in the config provided and they happened to be the only ones
	* to have the latest uberblock, we could involuntarily perform
	* an extreme rewind.
	*/
	healthy_tvds_mos = spa_healthy_core_tvds(spa);
	if (healthy_tvds_mos - healthy_tvds >=
	SPA_SYNC_MIN_VDEVS) {
	spa_load_note(spa, "config provided misses too many "
	"top-level vdevs compared to MOS (%lld vs %lld). ",
	(u_longlong_t)healthy_tvds,
	(u_longlong_t)healthy_tvds_mos);
	spa_load_note(spa, "vdev tree:");
	vdev_dbgmsg_print_tree(rvd, 2);
	if (reloading) {
	spa_load_failed(spa, "config was already "
	"provided from MOS. Aborting.");
	return (spa_vdev_err(rvd,
	VDEV_AUX_CORRUPT_DATA, EIO));
	}
	spa_load_note(spa, "spa must be reloaded using MOS "
	"config");
	return (SET_ERROR(EAGAIN));
	}
	}

	error = spa_check_for_missing_logs(spa);
	if (error != 0)
	return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO));

	if (rvd->vdev_guid_sum != spa->spa_uberblock.ub_guid_sum) {
	spa_load_failed(spa, "uberblock guid sum doesn't match MOS "
	"guid sum (%llu != %llu)",
	(u_longlong_t)spa->spa_uberblock.ub_guid_sum,
	(u_longlong_t)rvd->vdev_guid_sum);
	return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM,
	ENXIO));
	}

	return (0);
	}

	static int
	spa_ld_open_indirect_vdev_metadata(spa_t *spa)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	/*
	* Everything that we read before spa_remove_init() must be stored
	* on concreted vdevs. Therefore we do this as early as possible.
	*/
	error = spa_remove_init(spa);
	if (error != 0) {
	spa_load_failed(spa, "spa_remove_init failed [error=%d]",
	error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	/*
	* Retrieve information needed to condense indirect vdev mappings.
	*/
	error = spa_condense_init(spa);
	if (error != 0) {
	spa_load_failed(spa, "spa_condense_init failed [error=%d]",
	error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error));
	}

	return (0);
	}

	static int
	spa_ld_check_features(spa_t spa, boolean_t missing_feat_writep)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	if (spa_version(spa) >= SPA_VERSION_FEATURES) {
	boolean_t missing_feat_read = B_FALSE;
	nvlist_t unsup_feat, enabled_feat;

	if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ,
	&spa->spa_feat_for_read_obj, B_TRUE) != 0) {
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE,
	&spa->spa_feat_for_write_obj, B_TRUE) != 0) {
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS,
	&spa->spa_feat_desc_obj, B_TRUE) != 0) {
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	enabled_feat = fnvlist_alloc();
	unsup_feat = fnvlist_alloc();

	if (!spa_features_check(spa, B_FALSE,
	unsup_feat, enabled_feat))
	missing_feat_read = B_TRUE;

	if (spa_writeable(spa) \|\|
	spa->spa_load_state == SPA_LOAD_TRYIMPORT) {
	if (!spa_features_check(spa, B_TRUE,
	unsup_feat, enabled_feat)) {
	*missing_feat_writep = B_TRUE;
	}
	}

	fnvlist_add_nvlist(spa->spa_load_info,
	ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat);

	if (!nvlist_empty(unsup_feat)) {
	fnvlist_add_nvlist(spa->spa_load_info,
	ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat);
	}

	fnvlist_free(enabled_feat);
	fnvlist_free(unsup_feat);

	if (!missing_feat_read) {
	fnvlist_add_boolean(spa->spa_load_info,
	ZPOOL_CONFIG_CAN_RDONLY);
	}

	/*
	* If the state is SPA_LOAD_TRYIMPORT, our objective is
	* twofold: to determine whether the pool is available for
	* import in read-write mode and (if it is not) whether the
	* pool is available for import in read-only mode. If the pool
	* is available for import in read-write mode, it is displayed
	* as available in userland; if it is not available for import
	* in read-only mode, it is displayed as unavailable in
	* userland. If the pool is available for import in read-only
	* mode but not read-write mode, it is displayed as unavailable
	* in userland with a special note that the pool is actually
	* available for open in read-only mode.
	*
	* As a result, if the state is SPA_LOAD_TRYIMPORT and we are
	* missing a feature for write, we must first determine whether
	* the pool can be opened read-only before returning to
	* userland in order to know whether to display the
	* abovementioned note.
	*/
	if (missing_feat_read \|\| (*missing_feat_writep &&
	spa_writeable(spa))) {
	spa_load_failed(spa, "pool uses unsupported features");
	return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT,
	ENOTSUP));
	}

	/*
	* Load refcounts for ZFS features from disk into an in-memory
	* cache during SPA initialization.
	*/
	for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
	uint64_t refcount;

	error = feature_get_refcount_from_disk(spa,
	&spa_feature_table[i], &refcount);
	if (error == 0) {
	spa->spa_feat_refcount_cache[i] = refcount;
	} else if (error == ENOTSUP) {
	spa->spa_feat_refcount_cache[i] =
	SPA_FEATURE_DISABLED;
	} else {
	spa_load_failed(spa, "error getting refcount "
	"for feature %s [error=%d]",
	spa_feature_table[i].fi_guid, error);
	return (spa_vdev_err(rvd,
	VDEV_AUX_CORRUPT_DATA, EIO));
	}
	}
	}

	if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) {
	if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG,
	&spa->spa_feat_enabled_txg_obj, B_TRUE) != 0)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	/*
	* Encryption was added before bookmark_v2, even though bookmark_v2
	* is now a dependency. If this pool has encryption enabled without
	* bookmark_v2, trigger an errata message.
	*/
	if (spa_feature_is_enabled(spa, SPA_FEATURE_ENCRYPTION) &&
	!spa_feature_is_enabled(spa, SPA_FEATURE_BOOKMARK_V2)) {
	spa->spa_errata = ZPOOL_ERRATA_ZOL_8308_ENCRYPTION;
	}

	return (0);
	}

	static int
	spa_ld_load_special_directories(spa_t *spa)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	spa->spa_is_initializing = B_TRUE;
	error = dsl_pool_open(spa->spa_dsl_pool);
	spa->spa_is_initializing = B_FALSE;
	if (error != 0) {
	spa_load_failed(spa, "dsl_pool_open failed [error=%d]", error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	return (0);
	}

	static int
	spa_ld_get_props(spa_t *spa)
	{
	int error = 0;
	uint64_t obj;
	vdev_t *rvd = spa->spa_root_vdev;

	/* Grab the checksum salt from the MOS. */
	error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_CHECKSUM_SALT, 1,
	sizeof (spa->spa_cksum_salt.zcs_bytes),
	spa->spa_cksum_salt.zcs_bytes);
	if (error == ENOENT) {
	/* Generate a new salt for subsequent use */
	(void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes,
	sizeof (spa->spa_cksum_salt.zcs_bytes));
	} else if (error != 0) {
	spa_load_failed(spa, "unable to retrieve checksum salt from "
	"MOS [error=%d]", error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj, B_TRUE) != 0)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj);
	if (error != 0) {
	spa_load_failed(spa, "error opening deferred-frees bpobj "
	"[error=%d]", error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	/*
	* Load the bit that tells us to use the new accounting function
	* (raid-z deflation). If we have an older pool, this will not
	* be present.
	*/
	error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate, B_FALSE);
	if (error != 0 && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

	error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION,
	&spa->spa_creation_version, B_FALSE);
	if (error != 0 && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

	/*
	* Load the persistent error log. If we have an older pool, this will
	* not be present.
	*/
	error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last,
	B_FALSE);
	if (error != 0 && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

	error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB,
	&spa->spa_errlog_scrub, B_FALSE);
	if (error != 0 && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

	/*
	* Load the livelist deletion field. If a livelist is queued for
	* deletion, indicate that in the spa
	*/
	error = spa_dir_prop(spa, DMU_POOL_DELETED_CLONES,
	&spa->spa_livelists_to_delete, B_FALSE);
	if (error != 0 && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

	/*
	* Load the history object. If we have an older pool, this
	* will not be present.
	*/
	error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history, B_FALSE);
	if (error != 0 && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

	/*
	* Load the per-vdev ZAP map. If we have an older pool, this will not
	* be present; in this case, defer its creation to a later time to
	* avoid dirtying the MOS this early / out of sync context. See
	* spa_sync_config_object.
	*/

	/* The sentinel is only available in the MOS config. */
	nvlist_t *mos_config;
	if (load_nvlist(spa, spa->spa_config_object, &mos_config) != 0) {
	spa_load_failed(spa, "unable to retrieve MOS config");
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	error = spa_dir_prop(spa, DMU_POOL_VDEV_ZAP_MAP,
	&spa->spa_all_vdev_zaps, B_FALSE);

	if (error == ENOENT) {
	VERIFY(!nvlist_exists(mos_config,
	ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS));
	spa->spa_avz_action = AVZ_ACTION_INITIALIZE;
	ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev));
	} else if (error != 0) {
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	} else if (!nvlist_exists(mos_config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)) {
	/*
	* An older version of ZFS overwrote the sentinel value, so
	* we have orphaned per-vdev ZAPs in the MOS. Defer their
	* destruction to later; see spa_sync_config_object.
	*/
	spa->spa_avz_action = AVZ_ACTION_DESTROY;
	/*
	* We're assuming that no vdevs have had their ZAPs created
	* before this. Better be sure of it.
	*/
	ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev));
	}
	nvlist_free(mos_config);

	spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION);

	error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object,
	B_FALSE);
	if (error && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

	if (error == 0) {
	- uint64_t autoreplace;
	+ uint64_t autoreplace = 0;

	spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs);
	spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace);
	spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation);
	spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode);
	spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand);
	spa_prop_find(spa, ZPOOL_PROP_MULTIHOST, &spa->spa_multihost);
	spa_prop_find(spa, ZPOOL_PROP_AUTOTRIM, &spa->spa_autotrim);
	spa->spa_autoreplace = (autoreplace != 0);
	}

	/*
	* If we are importing a pool with missing top-level vdevs,
	* we enforce that the pool doesn't panic or get suspended on
	* error since the likelihood of missing data is extremely high.
	*/
	if (spa->spa_missing_tvds > 0 &&
	spa->spa_failmode != ZIO_FAILURE_MODE_CONTINUE &&
	spa->spa_load_state != SPA_LOAD_TRYIMPORT) {
	spa_load_note(spa, "forcing failmode to 'continue' "
	"as some top level vdevs are missing");
	spa->spa_failmode = ZIO_FAILURE_MODE_CONTINUE;
	}

	return (0);
	}

	static int
	spa_ld_open_aux_vdevs(spa_t *spa, spa_import_type_t type)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	/*
	* If we're assembling the pool from the split-off vdevs of
	* an existing pool, we don't want to attach the spares & cache
	* devices.
	*/

	/*
	* Load any hot spares for this pool.
	*/
	error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object,
	B_FALSE);
	if (error != 0 && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	if (error == 0 && type != SPA_IMPORT_ASSEMBLE) {
	ASSERT(spa_version(spa) >= SPA_VERSION_SPARES);
	if (load_nvlist(spa, spa->spa_spares.sav_object,
	&spa->spa_spares.sav_config) != 0) {
	spa_load_failed(spa, "error loading spares nvlist");
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	spa_load_spares(spa);
	spa_config_exit(spa, SCL_ALL, FTAG);
	} else if (error == 0) {
	spa->spa_spares.sav_sync = B_TRUE;
	}

	/*
	* Load any level 2 ARC devices for this pool.
	*/
	error = spa_dir_prop(spa, DMU_POOL_L2CACHE,
	&spa->spa_l2cache.sav_object, B_FALSE);
	if (error != 0 && error != ENOENT)
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	if (error == 0 && type != SPA_IMPORT_ASSEMBLE) {
	ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE);
	if (load_nvlist(spa, spa->spa_l2cache.sav_object,
	&spa->spa_l2cache.sav_config) != 0) {
	spa_load_failed(spa, "error loading l2cache nvlist");
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	spa_load_l2cache(spa);
	spa_config_exit(spa, SCL_ALL, FTAG);
	} else if (error == 0) {
	spa->spa_l2cache.sav_sync = B_TRUE;
	}

	return (0);
	}

	static int
	spa_ld_load_vdev_metadata(spa_t *spa)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	/*
	* If the 'multihost' property is set, then never allow a pool to
	* be imported when the system hostid is zero. The exception to
	* this rule is zdb which is always allowed to access pools.
	*/
	if (spa_multihost(spa) && spa_get_hostid(spa) == 0 &&
	(spa->spa_import_flags & ZFS_IMPORT_SKIP_MMP) == 0) {
	fnvlist_add_uint64(spa->spa_load_info,
	ZPOOL_CONFIG_MMP_STATE, MMP_STATE_NO_HOSTID);
	return (spa_vdev_err(rvd, VDEV_AUX_ACTIVE, EREMOTEIO));
	}

	/*
	* If the 'autoreplace' property is set, then post a resource notifying
	* the ZFS DE that it should not issue any faults for unopenable
	* devices. We also iterate over the vdevs, and post a sysevent for any
	* unopenable vdevs so that the normal autoreplace handler can take
	* over.
	*/
	if (spa->spa_autoreplace && spa->spa_load_state != SPA_LOAD_TRYIMPORT) {
	spa_check_removed(spa->spa_root_vdev);
	/*
	* For the import case, this is done in spa_import(), because
	* at this point we're using the spare definitions from
	* the MOS config, not necessarily from the userland config.
	*/
	if (spa->spa_load_state != SPA_LOAD_IMPORT) {
	spa_aux_check_removed(&spa->spa_spares);
	spa_aux_check_removed(&spa->spa_l2cache);
	}
	}

	/*
	* Load the vdev metadata such as metaslabs, DTLs, spacemap object, etc.
	*/
	error = vdev_load(rvd);
	if (error != 0) {
	spa_load_failed(spa, "vdev_load failed [error=%d]", error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error));
	}

	error = spa_ld_log_spacemaps(spa);
	if (error != 0) {
	spa_load_failed(spa, "spa_ld_log_sm_data failed [error=%d]",
	error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error));
	}

	/*
	* Propagate the leaf DTLs we just loaded all the way up the vdev tree.
	*/
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	vdev_dtl_reassess(rvd, 0, 0, B_FALSE, B_FALSE);
	spa_config_exit(spa, SCL_ALL, FTAG);

	return (0);
	}

	static int
	spa_ld_load_dedup_tables(spa_t *spa)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	error = ddt_load(spa);
	if (error != 0) {
	spa_load_failed(spa, "ddt_load failed [error=%d]", error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));
	}

	return (0);
	}

	static int
	spa_ld_verify_logs(spa_t spa, spa_import_type_t type, char *ereport)
	{
	vdev_t *rvd = spa->spa_root_vdev;

	if (type != SPA_IMPORT_ASSEMBLE && spa_writeable(spa)) {
	boolean_t missing = spa_check_logs(spa);
	if (missing) {
	if (spa->spa_missing_tvds != 0) {
	spa_load_note(spa, "spa_check_logs failed "
	"so dropping the logs");
	} else {
	*ereport = FM_EREPORT_ZFS_LOG_REPLAY;
	spa_load_failed(spa, "spa_check_logs failed");
	return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG,
	ENXIO));
	}
	}
	}

	return (0);
	}

	static int
	spa_ld_verify_pool_data(spa_t *spa)
	{
	int error = 0;
	vdev_t *rvd = spa->spa_root_vdev;

	/*
	* We've successfully opened the pool, verify that we're ready
	* to start pushing transactions.
	*/
	if (spa->spa_load_state != SPA_LOAD_TRYIMPORT) {
	error = spa_load_verify(spa);
	if (error != 0) {
	spa_load_failed(spa, "spa_load_verify failed "
	"[error=%d]", error);
	return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA,
	error));
	}
	}

	return (0);
	}

	static void
	spa_ld_claim_log_blocks(spa_t *spa)
	{
	dmu_tx_t *tx;
	dsl_pool_t *dp = spa_get_dsl(spa);

	/*
	* Claim log blocks that haven't been committed yet.
	* This must all happen in a single txg.
	* Note: spa_claim_max_txg is updated by spa_claim_notify(),
	* invoked from zil_claim_log_block()'s i/o done callback.
	* Price of rollback is that we abandon the log.
	*/
	spa->spa_claiming = B_TRUE;

	tx = dmu_tx_create_assigned(dp, spa_first_txg(spa));
	(void) dmu_objset_find_dp(dp, dp->dp_root_dir_obj,
	zil_claim, tx, DS_FIND_CHILDREN);
	dmu_tx_commit(tx);

	spa->spa_claiming = B_FALSE;

	spa_set_log_state(spa, SPA_LOG_GOOD);
	}

	static void
	spa_ld_check_for_config_update(spa_t *spa, uint64_t config_cache_txg,
	boolean_t update_config_cache)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	int need_update = B_FALSE;

	/*
	* If the config cache is stale, or we have uninitialized
	* metaslabs (see spa_vdev_add()), then update the config.
	*
	* If this is a verbatim import, trust the current
	* in-core spa_config and update the disk labels.
	*/
	if (update_config_cache \|\| config_cache_txg != spa->spa_config_txg \|\|
	spa->spa_load_state == SPA_LOAD_IMPORT \|\|
	spa->spa_load_state == SPA_LOAD_RECOVER \|\|
	(spa->spa_import_flags & ZFS_IMPORT_VERBATIM))
	need_update = B_TRUE;

	for (int c = 0; c < rvd->vdev_children; c++)
	if (rvd->vdev_child[c]->vdev_ms_array == 0)
	need_update = B_TRUE;

	/*
	* Update the config cache asynchronously in case we're the
	* root pool, in which case the config cache isn't writable yet.
	*/
	if (need_update)
	spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
	}

	static void
	spa_ld_prepare_for_reload(spa_t *spa)
	{
	spa_mode_t mode = spa->spa_mode;
	int async_suspended = spa->spa_async_suspended;

	spa_unload(spa);
	spa_deactivate(spa);
	spa_activate(spa, mode);

	/*
	* We save the value of spa_async_suspended as it gets reset to 0 by
	* spa_unload(). We want to restore it back to the original value before
	* returning as we might be calling spa_async_resume() later.
	*/
	spa->spa_async_suspended = async_suspended;
	}

	static int
	spa_ld_read_checkpoint_txg(spa_t *spa)
	{
	uberblock_t checkpoint;
	int error = 0;

	ASSERT0(spa->spa_checkpoint_txg);
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t),
	sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint);

	if (error == ENOENT)
	return (0);

	if (error != 0)
	return (error);

	ASSERT3U(checkpoint.ub_txg, !=, 0);
	ASSERT3U(checkpoint.ub_checkpoint_txg, !=, 0);
	ASSERT3U(checkpoint.ub_timestamp, !=, 0);
	spa->spa_checkpoint_txg = checkpoint.ub_txg;
	spa->spa_checkpoint_info.sci_timestamp = checkpoint.ub_timestamp;

	return (0);
	}

	static int
	spa_ld_mos_init(spa_t *spa, spa_import_type_t type)
	{
	int error = 0;

	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	ASSERT(spa->spa_config_source != SPA_CONFIG_SRC_NONE);

	/*
	* Never trust the config that is provided unless we are assembling
	* a pool following a split.
	* This means don't trust blkptrs and the vdev tree in general. This
	* also effectively puts the spa in read-only mode since
	* spa_writeable() checks for spa_trust_config to be true.
	* We will later load a trusted config from the MOS.
	*/
	if (type != SPA_IMPORT_ASSEMBLE)
	spa->spa_trust_config = B_FALSE;

	/*
	* Parse the config provided to create a vdev tree.
	*/
	error = spa_ld_parse_config(spa, type);
	if (error != 0)
	return (error);

	spa_import_progress_add(spa);

	/*
	* Now that we have the vdev tree, try to open each vdev. This involves
	* opening the underlying physical device, retrieving its geometry and
	* probing the vdev with a dummy I/O. The state of each vdev will be set
	* based on the success of those operations. After this we'll be ready
	* to read from the vdevs.
	*/
	error = spa_ld_open_vdevs(spa);
	if (error != 0)
	return (error);

	/*
	* Read the label of each vdev and make sure that the GUIDs stored
	* there match the GUIDs in the config provided.
	* If we're assembling a new pool that's been split off from an
	* existing pool, the labels haven't yet been updated so we skip
	* validation for now.
	*/
	if (type != SPA_IMPORT_ASSEMBLE) {
	error = spa_ld_validate_vdevs(spa);
	if (error != 0)
	return (error);
	}

	/*
	* Read all vdev labels to find the best uberblock (i.e. latest,
	* unless spa_load_max_txg is set) and store it in spa_uberblock. We
	* get the list of features required to read blkptrs in the MOS from
	* the vdev label with the best uberblock and verify that our version
	* of zfs supports them all.
	*/
	error = spa_ld_select_uberblock(spa, type);
	if (error != 0)
	return (error);

	/*
	* Pass that uberblock to the dsl_pool layer which will open the root
	* blkptr. This blkptr points to the latest version of the MOS and will
	* allow us to read its contents.
	*/
	error = spa_ld_open_rootbp(spa);
	if (error != 0)
	return (error);

	return (0);
	}

	static int
	spa_ld_checkpoint_rewind(spa_t *spa)
	{
	uberblock_t checkpoint;
	int error = 0;

	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	ASSERT(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT);

	error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t),
	sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint);

	if (error != 0) {
	spa_load_failed(spa, "unable to retrieve checkpointed "
	"uberblock from the MOS config [error=%d]", error);

	if (error == ENOENT)
	error = ZFS_ERR_NO_CHECKPOINT;

	return (error);
	}

	ASSERT3U(checkpoint.ub_txg, <, spa->spa_uberblock.ub_txg);
	ASSERT3U(checkpoint.ub_txg, ==, checkpoint.ub_checkpoint_txg);

	/*
	* We need to update the txg and timestamp of the checkpointed
	* uberblock to be higher than the latest one. This ensures that
	* the checkpointed uberblock is selected if we were to close and
	* reopen the pool right after we've written it in the vdev labels.
	* (also see block comment in vdev_uberblock_compare)
	*/
	checkpoint.ub_txg = spa->spa_uberblock.ub_txg + 1;
	checkpoint.ub_timestamp = gethrestime_sec();

	/*
	* Set current uberblock to be the checkpointed uberblock.
	*/
	spa->spa_uberblock = checkpoint;

	/*
	* If we are doing a normal rewind, then the pool is open for
	* writing and we sync the "updated" checkpointed uberblock to
	* disk. Once this is done, we've basically rewound the whole
	* pool and there is no way back.
	*
	* There are cases when we don't want to attempt and sync the
	* checkpointed uberblock to disk because we are opening a
	* pool as read-only. Specifically, verifying the checkpointed
	* state with zdb, and importing the checkpointed state to get
	* a "preview" of its content.
	*/
	if (spa_writeable(spa)) {
	vdev_t *rvd = spa->spa_root_vdev;

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	vdev_t *svd[SPA_SYNC_MIN_VDEVS] = { NULL };
	int svdcount = 0;
	int children = rvd->vdev_children;
	- int c0 = spa_get_random(children);
	+ int c0 = random_in_range(children);

	for (int c = 0; c < children; c++) {
	vdev_t *vd = rvd->vdev_child[(c0 + c) % children];

	/* Stop when revisiting the first vdev */
	if (c > 0 && svd[0] == vd)
	break;

	if (vd->vdev_ms_array == 0 \|\| vd->vdev_islog \|\|
	!vdev_is_concrete(vd))
	continue;

	svd[svdcount++] = vd;
	if (svdcount == SPA_SYNC_MIN_VDEVS)
	break;
	}
	error = vdev_config_sync(svd, svdcount, spa->spa_first_txg);
	if (error == 0)
	spa->spa_last_synced_guid = rvd->vdev_guid;
	spa_config_exit(spa, SCL_ALL, FTAG);

	if (error != 0) {
	spa_load_failed(spa, "failed to write checkpointed "
	"uberblock to the vdev labels [error=%d]", error);
	return (error);
	}
	}

	return (0);
	}

	static int
	spa_ld_mos_with_trusted_config(spa_t *spa, spa_import_type_t type,
	boolean_t *update_config_cache)
	{
	int error;

	/*
	* Parse the config for pool, open and validate vdevs,
	* select an uberblock, and use that uberblock to open
	* the MOS.
	*/
	error = spa_ld_mos_init(spa, type);
	if (error != 0)
	return (error);

	/*
	* Retrieve the trusted config stored in the MOS and use it to create
	* a new, exact version of the vdev tree, then reopen all vdevs.
	*/
	error = spa_ld_trusted_config(spa, type, B_FALSE);
	if (error == EAGAIN) {
	if (update_config_cache != NULL)
	*update_config_cache = B_TRUE;

	/*
	* Redo the loading process with the trusted config if it is
	* too different from the untrusted config.
	*/
	spa_ld_prepare_for_reload(spa);
	spa_load_note(spa, "RELOADING");
	error = spa_ld_mos_init(spa, type);
	if (error != 0)
	return (error);

	error = spa_ld_trusted_config(spa, type, B_TRUE);
	if (error != 0)
	return (error);

	} else if (error != 0) {
	return (error);
	}

	return (0);
	}

	/*
	* Load an existing storage pool, using the config provided. This config
	* describes which vdevs are part of the pool and is later validated against
	* partial configs present in each vdev's label and an entire copy of the
	* config stored in the MOS.
	*/
	static int
	spa_load_impl(spa_t spa, spa_import_type_t type, char *ereport)
	{
	int error = 0;
	boolean_t missing_feat_write = B_FALSE;
	boolean_t checkpoint_rewind =
	(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT);
	boolean_t update_config_cache = B_FALSE;

	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	ASSERT(spa->spa_config_source != SPA_CONFIG_SRC_NONE);

	spa_load_note(spa, "LOADING");

	error = spa_ld_mos_with_trusted_config(spa, type, &update_config_cache);
	if (error != 0)
	return (error);

	/*
	* If we are rewinding to the checkpoint then we need to repeat
	* everything we've done so far in this function but this time
	* selecting the checkpointed uberblock and using that to open
	* the MOS.
	*/
	if (checkpoint_rewind) {
	/*
	* If we are rewinding to the checkpoint update config cache
	* anyway.
	*/
	update_config_cache = B_TRUE;

	/*
	* Extract the checkpointed uberblock from the current MOS
	* and use this as the pool's uberblock from now on. If the
	* pool is imported as writeable we also write the checkpoint
	* uberblock to the labels, making the rewind permanent.
	*/
	error = spa_ld_checkpoint_rewind(spa);
	if (error != 0)
	return (error);

	/*
	* Redo the loading process again with the
	* checkpointed uberblock.
	*/
	spa_ld_prepare_for_reload(spa);
	spa_load_note(spa, "LOADING checkpointed uberblock");
	error = spa_ld_mos_with_trusted_config(spa, type, NULL);
	if (error != 0)
	return (error);
	}

	/*
	* Retrieve the checkpoint txg if the pool has a checkpoint.
	*/
	error = spa_ld_read_checkpoint_txg(spa);
	if (error != 0)
	return (error);

	/*
	* Retrieve the mapping of indirect vdevs. Those vdevs were removed
	* from the pool and their contents were re-mapped to other vdevs. Note
	* that everything that we read before this step must have been
	* rewritten on concrete vdevs after the last device removal was
	* initiated. Otherwise we could be reading from indirect vdevs before
	* we have loaded their mappings.
	*/
	error = spa_ld_open_indirect_vdev_metadata(spa);
	if (error != 0)
	return (error);

	/*
	* Retrieve the full list of active features from the MOS and check if
	* they are all supported.
	*/
	error = spa_ld_check_features(spa, &missing_feat_write);
	if (error != 0)
	return (error);

	/*
	* Load several special directories from the MOS needed by the dsl_pool
	* layer.
	*/
	error = spa_ld_load_special_directories(spa);
	if (error != 0)
	return (error);

	/*
	* Retrieve pool properties from the MOS.
	*/
	error = spa_ld_get_props(spa);
	if (error != 0)
	return (error);

	/*
	* Retrieve the list of auxiliary devices - cache devices and spares -
	* and open them.
	*/
	error = spa_ld_open_aux_vdevs(spa, type);
	if (error != 0)
	return (error);

	/*
	* Load the metadata for all vdevs. Also check if unopenable devices
	* should be autoreplaced.
	*/
	error = spa_ld_load_vdev_metadata(spa);
	if (error != 0)
	return (error);

	error = spa_ld_load_dedup_tables(spa);
	if (error != 0)
	return (error);

	/*
	* Verify the logs now to make sure we don't have any unexpected errors
	* when we claim log blocks later.
	*/
	error = spa_ld_verify_logs(spa, type, ereport);
	if (error != 0)
	return (error);

	if (missing_feat_write) {
	ASSERT(spa->spa_load_state == SPA_LOAD_TRYIMPORT);

	/*
	* At this point, we know that we can open the pool in
	* read-only mode but not read-write mode. We now have enough
	* information and can return to userland.
	*/
	return (spa_vdev_err(spa->spa_root_vdev, VDEV_AUX_UNSUP_FEAT,
	ENOTSUP));
	}

	/*
	* Traverse the last txgs to make sure the pool was left off in a safe
	* state. When performing an extreme rewind, we verify the whole pool,
	* which can take a very long time.
	*/
	error = spa_ld_verify_pool_data(spa);
	if (error != 0)
	return (error);

	/*
	* Calculate the deflated space for the pool. This must be done before
	* we write anything to the pool because we'd need to update the space
	* accounting using the deflated sizes.
	*/
	spa_update_dspace(spa);

	/*
	* We have now retrieved all the information we needed to open the
	* pool. If we are importing the pool in read-write mode, a few
	* additional steps must be performed to finish the import.
	*/
	if (spa_writeable(spa) && (spa->spa_load_state == SPA_LOAD_RECOVER \|\|
	spa->spa_load_max_txg == UINT64_MAX)) {
	uint64_t config_cache_txg = spa->spa_config_txg;

	ASSERT(spa->spa_load_state != SPA_LOAD_TRYIMPORT);

	/*
	* In case of a checkpoint rewind, log the original txg
	* of the checkpointed uberblock.
	*/
	if (checkpoint_rewind) {
	spa_history_log_internal(spa, "checkpoint rewind",
	NULL, "rewound state to txg=%llu",
	(u_longlong_t)spa->spa_uberblock.ub_checkpoint_txg);
	}

	/*
	* Traverse the ZIL and claim all blocks.
	*/
	spa_ld_claim_log_blocks(spa);

	/*
	* Kick-off the syncing thread.
	*/
	spa->spa_sync_on = B_TRUE;
	txg_sync_start(spa->spa_dsl_pool);
	mmp_thread_start(spa);

	/*
	* Wait for all claims to sync. We sync up to the highest
	* claimed log block birth time so that claimed log blocks
	* don't appear to be from the future. spa_claim_max_txg
	* will have been set for us by ZIL traversal operations
	* performed above.
	*/
	txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg);

	/*
	* Check if we need to request an update of the config. On the
	* next sync, we would update the config stored in vdev labels
	* and the cachefile (by default /etc/zfs/zpool.cache).
	*/
	spa_ld_check_for_config_update(spa, config_cache_txg,
	update_config_cache);

	/*
	* Check if a rebuild was in progress and if so resume it.
	* Then check all DTLs to see if anything needs resilvering.
	* The resilver will be deferred if a rebuild was started.
	*/
	if (vdev_rebuild_active(spa->spa_root_vdev)) {
	vdev_rebuild_restart(spa);
	} else if (!dsl_scan_resilvering(spa->spa_dsl_pool) &&
	vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) {
	spa_async_request(spa, SPA_ASYNC_RESILVER);
	}

	/*
	* Log the fact that we booted up (so that we can detect if
	* we rebooted in the middle of an operation).
	*/
	spa_history_log_version(spa, "open", NULL);

	spa_restart_removal(spa);
	spa_spawn_aux_threads(spa);

	/*
	* Delete any inconsistent datasets.
	*
	* Note:
	* Since we may be issuing deletes for clones here,
	* we make sure to do so after we've spawned all the
	* auxiliary threads above (from which the livelist
	* deletion zthr is part of).
	*/
	(void) dmu_objset_find(spa_name(spa),
	dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN);

	/*
	* Clean up any stale temporary dataset userrefs.
	*/
	dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool);

	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	vdev_initialize_restart(spa->spa_root_vdev);
	vdev_trim_restart(spa->spa_root_vdev);
	vdev_autotrim_restart(spa);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	}

	spa_import_progress_remove(spa_guid(spa));
	spa_async_request(spa, SPA_ASYNC_L2CACHE_REBUILD);

	spa_load_note(spa, "LOADED");

	return (0);
	}

	static int
	spa_load_retry(spa_t *spa, spa_load_state_t state)
	{
	spa_mode_t mode = spa->spa_mode;

	spa_unload(spa);
	spa_deactivate(spa);

	spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1;

	spa_activate(spa, mode);
	spa_async_suspend(spa);

	spa_load_note(spa, "spa_load_retry: rewind, max txg: %llu",
	(u_longlong_t)spa->spa_load_max_txg);

	return (spa_load(spa, state, SPA_IMPORT_EXISTING));
	}

	/*
	* If spa_load() fails this function will try loading prior txg's. If
	* 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool
	* will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this
	* function will not rewind the pool and will return the same error as
	* spa_load().
	*/
	static int
	spa_load_best(spa_t *spa, spa_load_state_t state, uint64_t max_request,
	int rewind_flags)
	{
	nvlist_t *loadinfo = NULL;
	nvlist_t *config = NULL;
	int load_error, rewind_error;
	uint64_t safe_rewind_txg;
	uint64_t min_txg;

	if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) {
	spa->spa_load_max_txg = spa->spa_load_txg;
	spa_set_log_state(spa, SPA_LOG_CLEAR);
	} else {
	spa->spa_load_max_txg = max_request;
	if (max_request != UINT64_MAX)
	spa->spa_extreme_rewind = B_TRUE;
	}

	load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING);
	if (load_error == 0)
	return (0);
	if (load_error == ZFS_ERR_NO_CHECKPOINT) {
	/*
	* When attempting checkpoint-rewind on a pool with no
	* checkpoint, we should not attempt to load uberblocks
	* from previous txgs when spa_load fails.
	*/
	ASSERT(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT);
	spa_import_progress_remove(spa_guid(spa));
	return (load_error);
	}

	if (spa->spa_root_vdev != NULL)
	config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);

	spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg;
	spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp;

	if (rewind_flags & ZPOOL_NEVER_REWIND) {
	nvlist_free(config);
	spa_import_progress_remove(spa_guid(spa));
	return (load_error);
	}

	if (state == SPA_LOAD_RECOVER) {
	/* Price of rolling back is discarding txgs, including log */
	spa_set_log_state(spa, SPA_LOG_CLEAR);
	} else {
	/*
	* If we aren't rolling back save the load info from our first
	* import attempt so that we can restore it after attempting
	* to rewind.
	*/
	loadinfo = spa->spa_load_info;
	spa->spa_load_info = fnvlist_alloc();
	}

	spa->spa_load_max_txg = spa->spa_last_ubsync_txg;
	safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE;
	min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ?
	TXG_INITIAL : safe_rewind_txg;

	/*
	* Continue as long as we're finding errors, we're still within
	* the acceptable rewind range, and we're still finding uberblocks
	*/
	while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg &&
	spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) {
	if (spa->spa_load_max_txg < safe_rewind_txg)
	spa->spa_extreme_rewind = B_TRUE;
	rewind_error = spa_load_retry(spa, state);
	}

	spa->spa_extreme_rewind = B_FALSE;
	spa->spa_load_max_txg = UINT64_MAX;

	if (config && (rewind_error \|\| state != SPA_LOAD_RECOVER))
	spa_config_set(spa, config);
	else
	nvlist_free(config);

	if (state == SPA_LOAD_RECOVER) {
	ASSERT3P(loadinfo, ==, NULL);
	spa_import_progress_remove(spa_guid(spa));
	return (rewind_error);
	} else {
	/* Store the rewind info as part of the initial load info */
	fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO,
	spa->spa_load_info);

	/* Restore the initial load info */
	fnvlist_free(spa->spa_load_info);
	spa->spa_load_info = loadinfo;

	spa_import_progress_remove(spa_guid(spa));
	return (load_error);
	}
	}

	/*
	* Pool Open/Import
	*
	* The import case is identical to an open except that the configuration is sent
	* down from userland, instead of grabbed from the configuration cache. For the
	* case of an open, the pool configuration will exist in the
	* POOL_STATE_UNINITIALIZED state.
	*
	* The stats information (gen/count/ustats) is used to gather vdev statistics at
	* the same time open the pool, without having to keep around the spa_t in some
	* ambiguous state.
	*/
	static int
	spa_open_common(const char pool, spa_t spapp, void tag, nvlist_t *nvpolicy,
	nvlist_t **config)
	{
	spa_t *spa;
	spa_load_state_t state = SPA_LOAD_OPEN;
	int error;
	int locked = B_FALSE;
	int firstopen = B_FALSE;

	*spapp = NULL;

	/*
	* As disgusting as this is, we need to support recursive calls to this
	* function because dsl_dir_open() is called during spa_load(), and ends
	* up calling spa_open() again. The real fix is to figure out how to
	* avoid dsl_dir_open() calling this in the first place.
	*/
	if (MUTEX_NOT_HELD(&spa_namespace_lock)) {
	mutex_enter(&spa_namespace_lock);
	locked = B_TRUE;
	}

	if ((spa = spa_lookup(pool)) == NULL) {
	if (locked)
	mutex_exit(&spa_namespace_lock);
	return (SET_ERROR(ENOENT));
	}

	if (spa->spa_state == POOL_STATE_UNINITIALIZED) {
	zpool_load_policy_t policy;

	firstopen = B_TRUE;

	zpool_get_load_policy(nvpolicy ? nvpolicy : spa->spa_config,
	&policy);
	if (policy.zlp_rewind & ZPOOL_DO_REWIND)
	state = SPA_LOAD_RECOVER;

	spa_activate(spa, spa_mode_global);

	if (state != SPA_LOAD_RECOVER)
	spa->spa_last_ubsync_txg = spa->spa_load_txg = 0;
	spa->spa_config_source = SPA_CONFIG_SRC_CACHEFILE;

	zfs_dbgmsg("spa_open_common: opening %s", pool);
	error = spa_load_best(spa, state, policy.zlp_txg,
	policy.zlp_rewind);

	if (error == EBADF) {
	/*
	* If vdev_validate() returns failure (indicated by
	* EBADF), it indicates that one of the vdevs indicates
	* that the pool has been exported or destroyed. If
	* this is the case, the config cache is out of sync and
	* we should remove the pool from the namespace.
	*/
	spa_unload(spa);
	spa_deactivate(spa);
	spa_write_cachefile(spa, B_TRUE, B_TRUE);
	spa_remove(spa);
	if (locked)
	mutex_exit(&spa_namespace_lock);
	return (SET_ERROR(ENOENT));
	}

	if (error) {
	/*
	* We can't open the pool, but we still have useful
	* information: the state of each vdev after the
	* attempted vdev_open(). Return this to the user.
	*/
	if (config != NULL && spa->spa_config) {
	VERIFY(nvlist_dup(spa->spa_config, config,
	KM_SLEEP) == 0);
	VERIFY(nvlist_add_nvlist(*config,
	ZPOOL_CONFIG_LOAD_INFO,
	spa->spa_load_info) == 0);
	}
	spa_unload(spa);
	spa_deactivate(spa);
	spa->spa_last_open_failed = error;
	if (locked)
	mutex_exit(&spa_namespace_lock);
	*spapp = NULL;
	return (error);
	}
	}

	spa_open_ref(spa, tag);

	if (config != NULL)
	*config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);

	/*
	* If we've recovered the pool, pass back any information we
	* gathered while doing the load.
	*/
	if (state == SPA_LOAD_RECOVER) {
	VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO,
	spa->spa_load_info) == 0);
	}

	if (locked) {
	spa->spa_last_open_failed = 0;
	spa->spa_last_ubsync_txg = 0;
	spa->spa_load_txg = 0;
	mutex_exit(&spa_namespace_lock);
	}

	if (firstopen)
	zvol_create_minors_recursive(spa_name(spa));

	*spapp = spa;

	return (0);
	}

	int
	spa_open_rewind(const char name, spa_t spapp, void tag, nvlist_t *policy,
	nvlist_t **config)
	{
	return (spa_open_common(name, spapp, tag, policy, config));
	}

	int
	spa_open(const char name, spa_t spapp, void tag)
	{
	return (spa_open_common(name, spapp, tag, NULL, NULL));
	}

	/*
	* Lookup the given spa_t, incrementing the inject count in the process,
	* preventing it from being exported or destroyed.
	*/
	spa_t *
	spa_inject_addref(char *name)
	{
	spa_t *spa;

	mutex_enter(&spa_namespace_lock);
	if ((spa = spa_lookup(name)) == NULL) {
	mutex_exit(&spa_namespace_lock);
	return (NULL);
	}
	spa->spa_inject_ref++;
	mutex_exit(&spa_namespace_lock);

	return (spa);
	}

	void
	spa_inject_delref(spa_t *spa)
	{
	mutex_enter(&spa_namespace_lock);
	spa->spa_inject_ref--;
	mutex_exit(&spa_namespace_lock);
	}

	/*
	* Add spares device information to the nvlist.
	*/
	static void
	spa_add_spares(spa_t spa, nvlist_t config)
	{
	nvlist_t **spares;
	uint_t i, nspares;
	nvlist_t *nvroot;
	uint64_t guid;
	vdev_stat_t *vs;
	uint_t vsc;
	uint64_t pool;

	ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));

	if (spa->spa_spares.sav_count == 0)
	return;

	VERIFY(nvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
	VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config,
	ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);
	if (nspares != 0) {
	VERIFY(nvlist_add_nvlist_array(nvroot,
	ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
	VERIFY(nvlist_lookup_nvlist_array(nvroot,
	ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0);

	/*
	* Go through and find any spares which have since been
	* repurposed as an active spare. If this is the case, update
	* their status appropriately.
	*/
	for (i = 0; i < nspares; i++) {
	VERIFY(nvlist_lookup_uint64(spares[i],
	ZPOOL_CONFIG_GUID, &guid) == 0);
	if (spa_spare_exists(guid, &pool, NULL) &&
	pool != 0ULL) {
	VERIFY(nvlist_lookup_uint64_array(
	spares[i], ZPOOL_CONFIG_VDEV_STATS,
	(uint64_t **)&vs, &vsc) == 0);
	vs->vs_state = VDEV_STATE_CANT_OPEN;
	vs->vs_aux = VDEV_AUX_SPARED;
	}
	}
	}
	}

	/*
	* Add l2cache device information to the nvlist, including vdev stats.
	*/
	static void
	spa_add_l2cache(spa_t spa, nvlist_t config)
	{
	nvlist_t **l2cache;
	uint_t i, j, nl2cache;
	nvlist_t *nvroot;
	uint64_t guid;
	vdev_t *vd;
	vdev_stat_t *vs;
	uint_t vsc;

	ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));

	if (spa->spa_l2cache.sav_count == 0)
	return;

	VERIFY(nvlist_lookup_nvlist(config,
	ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
	VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config,
	ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);
	if (nl2cache != 0) {
	VERIFY(nvlist_add_nvlist_array(nvroot,
	ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
	VERIFY(nvlist_lookup_nvlist_array(nvroot,
	ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0);

	/*
	* Update level 2 cache device stats.
	*/

	for (i = 0; i < nl2cache; i++) {
	VERIFY(nvlist_lookup_uint64(l2cache[i],
	ZPOOL_CONFIG_GUID, &guid) == 0);

	vd = NULL;
	for (j = 0; j < spa->spa_l2cache.sav_count; j++) {
	if (guid ==
	spa->spa_l2cache.sav_vdevs[j]->vdev_guid) {
	vd = spa->spa_l2cache.sav_vdevs[j];
	break;
	}
	}
	ASSERT(vd != NULL);

	VERIFY(nvlist_lookup_uint64_array(l2cache[i],
	ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc)
	== 0);
	vdev_get_stats(vd, vs);
	vdev_config_generate_stats(vd, l2cache[i]);

	}
	}
	}

	static void
	spa_feature_stats_from_disk(spa_t spa, nvlist_t features)
	{
	zap_cursor_t zc;
	zap_attribute_t za;

	if (spa->spa_feat_for_read_obj != 0) {
	for (zap_cursor_init(&zc, spa->spa_meta_objset,
	spa->spa_feat_for_read_obj);
	zap_cursor_retrieve(&zc, &za) == 0;
	zap_cursor_advance(&zc)) {
	ASSERT(za.za_integer_length == sizeof (uint64_t) &&
	za.za_num_integers == 1);
	VERIFY0(nvlist_add_uint64(features, za.za_name,
	za.za_first_integer));
	}
	zap_cursor_fini(&zc);
	}

	if (spa->spa_feat_for_write_obj != 0) {
	for (zap_cursor_init(&zc, spa->spa_meta_objset,
	spa->spa_feat_for_write_obj);
	zap_cursor_retrieve(&zc, &za) == 0;
	zap_cursor_advance(&zc)) {
	ASSERT(za.za_integer_length == sizeof (uint64_t) &&
	za.za_num_integers == 1);
	VERIFY0(nvlist_add_uint64(features, za.za_name,
	za.za_first_integer));
	}
	zap_cursor_fini(&zc);
	}
	}

	static void
	spa_feature_stats_from_cache(spa_t spa, nvlist_t features)
	{
	int i;

	for (i = 0; i < SPA_FEATURES; i++) {
	zfeature_info_t feature = spa_feature_table[i];
	uint64_t refcount;

	if (feature_get_refcount(spa, &feature, &refcount) != 0)
	continue;

	VERIFY0(nvlist_add_uint64(features, feature.fi_guid, refcount));
	}
	}

	/*
	* Store a list of pool features and their reference counts in the
	* config.
	*
	* The first time this is called on a spa, allocate a new nvlist, fetch
	* the pool features and reference counts from disk, then save the list
	* in the spa. In subsequent calls on the same spa use the saved nvlist
	* and refresh its values from the cached reference counts. This
	* ensures we don't block here on I/O on a suspended pool so 'zpool
	* clear' can resume the pool.
	*/
	static void
	spa_add_feature_stats(spa_t spa, nvlist_t config)
	{
	nvlist_t *features;

	ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));

	mutex_enter(&spa->spa_feat_stats_lock);
	features = spa->spa_feat_stats;

	if (features != NULL) {
	spa_feature_stats_from_cache(spa, features);
	} else {
	VERIFY0(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP));
	spa->spa_feat_stats = features;
	spa_feature_stats_from_disk(spa, features);
	}

	VERIFY0(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS,
	features));

	mutex_exit(&spa->spa_feat_stats_lock);
	}

	int
	spa_get_stats(const char name, nvlist_t *config,
	char *altroot, size_t buflen)
	{
	int error;
	spa_t *spa;

	*config = NULL;
	error = spa_open_common(name, &spa, FTAG, NULL, config);

	if (spa != NULL) {
	/*
	* This still leaves a window of inconsistency where the spares
	* or l2cache devices could change and the config would be
	* self-inconsistent.
	*/
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);

	if (*config != NULL) {
	uint64_t loadtimes[2];

	loadtimes[0] = spa->spa_loaded_ts.tv_sec;
	loadtimes[1] = spa->spa_loaded_ts.tv_nsec;
	VERIFY(nvlist_add_uint64_array(*config,
	ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0);

	VERIFY(nvlist_add_uint64(*config,
	ZPOOL_CONFIG_ERRCOUNT,
	spa_get_errlog_size(spa)) == 0);

	if (spa_suspended(spa)) {
	VERIFY(nvlist_add_uint64(*config,
	ZPOOL_CONFIG_SUSPENDED,
	spa->spa_failmode) == 0);
	VERIFY(nvlist_add_uint64(*config,
	ZPOOL_CONFIG_SUSPENDED_REASON,
	spa->spa_suspended) == 0);
	}

	spa_add_spares(spa, *config);
	spa_add_l2cache(spa, *config);
	spa_add_feature_stats(spa, *config);
	}
	}

	/*
	* We want to get the alternate root even for faulted pools, so we cheat
	* and call spa_lookup() directly.
	*/
	if (altroot) {
	if (spa == NULL) {
	mutex_enter(&spa_namespace_lock);
	spa = spa_lookup(name);
	if (spa)
	spa_altroot(spa, altroot, buflen);
	else
	altroot[0] = '\0';
	spa = NULL;
	mutex_exit(&spa_namespace_lock);
	} else {
	spa_altroot(spa, altroot, buflen);
	}
	}

	if (spa != NULL) {
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	spa_close(spa, FTAG);
	}

	return (error);
	}

	/*
	* Validate that the auxiliary device array is well formed. We must have an
	* array of nvlists, each which describes a valid leaf vdev. If this is an
	* import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be
	* specified, as long as they are well-formed.
	*/
	static int
	spa_validate_aux_devs(spa_t spa, nvlist_t nvroot, uint64_t crtxg, int mode,
	spa_aux_vdev_t sav, const char config, uint64_t version,
	vdev_labeltype_t label)
	{
	nvlist_t **dev;
	uint_t i, ndev;
	vdev_t *vd;
	int error;

	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);

	/*
	* It's acceptable to have no devs specified.
	*/
	if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0)
	return (0);

	if (ndev == 0)
	return (SET_ERROR(EINVAL));

	/*
	* Make sure the pool is formatted with a version that supports this
	* device type.
	*/
	if (spa_version(spa) < version)
	return (SET_ERROR(ENOTSUP));

	/*
	* Set the pending device list so we correctly handle device in-use
	* checking.
	*/
	sav->sav_pending = dev;
	sav->sav_npending = ndev;

	for (i = 0; i < ndev; i++) {
	if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0,
	mode)) != 0)
	goto out;

	if (!vd->vdev_ops->vdev_op_leaf) {
	vdev_free(vd);
	error = SET_ERROR(EINVAL);
	goto out;
	}

	vd->vdev_top = vd;

	if ((error = vdev_open(vd)) == 0 &&
	(error = vdev_label_init(vd, crtxg, label)) == 0) {
	VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID,
	vd->vdev_guid) == 0);
	}

	vdev_free(vd);

	if (error &&
	(mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE))
	goto out;
	else
	error = 0;
	}

	out:
	sav->sav_pending = NULL;
	sav->sav_npending = 0;
	return (error);
	}

	static int
	spa_validate_aux(spa_t spa, nvlist_t nvroot, uint64_t crtxg, int mode)
	{
	int error;

	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);

	if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode,
	&spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES,
	VDEV_LABEL_SPARE)) != 0) {
	return (error);
	}

	return (spa_validate_aux_devs(spa, nvroot, crtxg, mode,
	&spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE,
	VDEV_LABEL_L2CACHE));
	}

	static void
	spa_set_aux_vdevs(spa_aux_vdev_t sav, nvlist_t *devs, int ndevs,
	const char *config)
	{
	int i;

	if (sav->sav_config != NULL) {
	nvlist_t **olddevs;
	uint_t oldndevs;
	nvlist_t **newdevs;

	/*
	* Generate new dev list by concatenating with the
	* current dev list.
	*/
	VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config,
	&olddevs, &oldndevs) == 0);

	newdevs = kmem_alloc(sizeof (void )
	(ndevs + oldndevs), KM_SLEEP);
	for (i = 0; i < oldndevs; i++)
	VERIFY(nvlist_dup(olddevs[i], &newdevs[i],
	KM_SLEEP) == 0);
	for (i = 0; i < ndevs; i++)
	VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs],
	KM_SLEEP) == 0);

	VERIFY(nvlist_remove(sav->sav_config, config,
	DATA_TYPE_NVLIST_ARRAY) == 0);

	VERIFY(nvlist_add_nvlist_array(sav->sav_config,
	config, newdevs, ndevs + oldndevs) == 0);
	for (i = 0; i < oldndevs + ndevs; i++)
	nvlist_free(newdevs[i]);
	kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *));
	} else {
	/*
	* Generate a new dev list.
	*/
	VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME,
	KM_SLEEP) == 0);
	VERIFY(nvlist_add_nvlist_array(sav->sav_config, config,
	devs, ndevs) == 0);
	}
	}

	/*
	* Stop and drop level 2 ARC devices
	*/
	void
	spa_l2cache_drop(spa_t *spa)
	{
	vdev_t *vd;
	int i;
	spa_aux_vdev_t *sav = &spa->spa_l2cache;

	for (i = 0; i < sav->sav_count; i++) {
	uint64_t pool;

	vd = sav->sav_vdevs[i];
	ASSERT(vd != NULL);

	if (spa_l2cache_exists(vd->vdev_guid, &pool) &&
	pool != 0ULL && l2arc_vdev_present(vd))
	l2arc_remove_vdev(vd);
	}
	}

	/*
	* Verify encryption parameters for spa creation. If we are encrypting, we must
	* have the encryption feature flag enabled.
	*/
	static int
	spa_create_check_encryption_params(dsl_crypto_params_t *dcp,
	boolean_t has_encryption)
	{
	if (dcp->cp_crypt != ZIO_CRYPT_OFF &&
	dcp->cp_crypt != ZIO_CRYPT_INHERIT &&
	!has_encryption)
	return (SET_ERROR(ENOTSUP));

	return (dmu_objset_create_crypt_check(NULL, dcp, NULL));
	}

	/*
	* Pool Creation
	*/
	int
	spa_create(const char pool, nvlist_t nvroot, nvlist_t *props,
	nvlist_t zplprops, dsl_crypto_params_t dcp)
	{
	spa_t *spa;
	char *altroot = NULL;
	vdev_t *rvd;
	dsl_pool_t *dp;
	dmu_tx_t *tx;
	int error = 0;
	uint64_t txg = TXG_INITIAL;
	nvlist_t spares, l2cache;
	uint_t nspares, nl2cache;
	uint64_t version, obj, ndraid = 0;
	boolean_t has_features;
	boolean_t has_encryption;
	boolean_t has_allocclass;
	spa_feature_t feat;
	char *feat_name;
	char *poolname;
	nvlist_t *nvl;

	if (props == NULL \|\|
	nvlist_lookup_string(props, "tname", &poolname) != 0)
	poolname = (char *)pool;

	/*
	* If this pool already exists, return failure.
	*/
	mutex_enter(&spa_namespace_lock);
	if (spa_lookup(poolname) != NULL) {
	mutex_exit(&spa_namespace_lock);
	return (SET_ERROR(EEXIST));
	}

	/*
	* Allocate a new spa_t structure.
	*/
	nvl = fnvlist_alloc();
	fnvlist_add_string(nvl, ZPOOL_CONFIG_POOL_NAME, pool);
	(void) nvlist_lookup_string(props,
	zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
	spa = spa_add(poolname, nvl, altroot);
	fnvlist_free(nvl);
	spa_activate(spa, spa_mode_global);

	if (props && (error = spa_prop_validate(spa, props))) {
	spa_deactivate(spa);
	spa_remove(spa);
	mutex_exit(&spa_namespace_lock);
	return (error);
	}

	/*
	* Temporary pool names should never be written to disk.
	*/
	if (poolname != pool)
	spa->spa_import_flags \|= ZFS_IMPORT_TEMP_NAME;

	has_features = B_FALSE;
	has_encryption = B_FALSE;
	has_allocclass = B_FALSE;
	for (nvpair_t *elem = nvlist_next_nvpair(props, NULL);
	elem != NULL; elem = nvlist_next_nvpair(props, elem)) {
	if (zpool_prop_feature(nvpair_name(elem))) {
	has_features = B_TRUE;

	feat_name = strchr(nvpair_name(elem), '@') + 1;
	VERIFY0(zfeature_lookup_name(feat_name, &feat));
	if (feat == SPA_FEATURE_ENCRYPTION)
	has_encryption = B_TRUE;
	if (feat == SPA_FEATURE_ALLOCATION_CLASSES)
	has_allocclass = B_TRUE;
	}
	}

	/* verify encryption params, if they were provided */
	if (dcp != NULL) {
	error = spa_create_check_encryption_params(dcp, has_encryption);
	if (error != 0) {
	spa_deactivate(spa);
	spa_remove(spa);
	mutex_exit(&spa_namespace_lock);
	return (error);
	}
	}
	if (!has_allocclass && zfs_special_devs(nvroot, NULL)) {
	spa_deactivate(spa);
	spa_remove(spa);
	mutex_exit(&spa_namespace_lock);
	return (ENOTSUP);
	}

	if (has_features \|\| nvlist_lookup_uint64(props,
	zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) {
	version = SPA_VERSION;
	}
	ASSERT(SPA_VERSION_IS_SUPPORTED(version));

	spa->spa_first_txg = txg;
	spa->spa_uberblock.ub_txg = txg - 1;
	spa->spa_uberblock.ub_version = version;
	spa->spa_ubsync = spa->spa_uberblock;
	spa->spa_load_state = SPA_LOAD_CREATE;
	spa->spa_removing_phys.sr_state = DSS_NONE;
	spa->spa_removing_phys.sr_removing_vdev = -1;
	spa->spa_removing_phys.sr_prev_indirect_vdev = -1;
	spa->spa_indirect_vdevs_loaded = B_TRUE;

	/*
	* Create "The Godfather" zio to hold all async IOs
	*/
	spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *),
	KM_SLEEP);
	for (int i = 0; i < max_ncpus; i++) {
	spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE \|
	ZIO_FLAG_GODFATHER);
	}

	/*
	* Create the root vdev.
	*/
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);

	error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD);

	ASSERT(error != 0 \|\| rvd != NULL);
	ASSERT(error != 0 \|\| spa->spa_root_vdev == rvd);

	if (error == 0 && !zfs_allocatable_devs(nvroot))
	error = SET_ERROR(EINVAL);

	if (error == 0 &&
	(error = vdev_create(rvd, txg, B_FALSE)) == 0 &&
	(error = vdev_draid_spare_create(nvroot, rvd, &ndraid, 0)) == 0 &&
	(error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) == 0) {
	/*
	* instantiate the metaslab groups (this will dirty the vdevs)
	* we can no longer error exit past this point
	*/
	for (int c = 0; error == 0 && c < rvd->vdev_children; c++) {
	vdev_t *vd = rvd->vdev_child[c];

	vdev_metaslab_set_size(vd);
	vdev_expand(vd, txg);
	}
	}

	spa_config_exit(spa, SCL_ALL, FTAG);

	if (error != 0) {
	spa_unload(spa);
	spa_deactivate(spa);
	spa_remove(spa);
	mutex_exit(&spa_namespace_lock);
	return (error);
	}

	/*
	* Get the list of spares, if specified.
	*/
	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
	&spares, &nspares) == 0) {
	VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME,
	KM_SLEEP) == 0);
	VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
	ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	spa_load_spares(spa);
	spa_config_exit(spa, SCL_ALL, FTAG);
	spa->spa_spares.sav_sync = B_TRUE;
	}

	/*
	* Get the list of level 2 cache devices, if specified.
	*/
	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
	&l2cache, &nl2cache) == 0) {
	VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config,
	NV_UNIQUE_NAME, KM_SLEEP) == 0);
	VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config,
	ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	spa_load_l2cache(spa);
	spa_config_exit(spa, SCL_ALL, FTAG);
	spa->spa_l2cache.sav_sync = B_TRUE;
	}

	spa->spa_is_initializing = B_TRUE;
	spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, dcp, txg);
	spa->spa_is_initializing = B_FALSE;

	/*
	* Create DDTs (dedup tables).
	*/
	ddt_create(spa);

	spa_update_dspace(spa);

	tx = dmu_tx_create_assigned(dp, txg);

	/*
	* Create the pool's history object.
	*/
	if (version >= SPA_VERSION_ZPOOL_HISTORY && !spa->spa_history)
	spa_history_create_obj(spa, tx);

	spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_CREATE);
	spa_history_log_version(spa, "create", tx);

	/*
	* Create the pool config object.
	*/
	spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset,
	DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE,
	DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx);

	if (zap_add(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG,
	sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) {
	cmn_err(CE_PANIC, "failed to add pool config");
	}

	if (zap_add(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION,
	sizeof (uint64_t), 1, &version, tx) != 0) {
	cmn_err(CE_PANIC, "failed to add pool version");
	}

	/* Newly created pools with the right version are always deflated. */
	if (version >= SPA_VERSION_RAIDZ_DEFLATE) {
	spa->spa_deflate = TRUE;
	if (zap_add(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE,
	sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) {
	cmn_err(CE_PANIC, "failed to add deflate");
	}
	}

	/*
	* Create the deferred-free bpobj. Turn off compression
	* because sync-to-convergence takes longer if the blocksize
	* keeps changing.
	*/
	obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx);
	dmu_object_set_compress(spa->spa_meta_objset, obj,
	ZIO_COMPRESS_OFF, tx);
	if (zap_add(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ,
	sizeof (uint64_t), 1, &obj, tx) != 0) {
	cmn_err(CE_PANIC, "failed to add bpobj");
	}
	VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj,
	spa->spa_meta_objset, obj));

	/*
	* Generate some random noise for salted checksums to operate on.
	*/
	(void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes,
	sizeof (spa->spa_cksum_salt.zcs_bytes));

	/*
	* Set pool properties.
	*/
	spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS);
	spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION);
	spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE);
	spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND);
	spa->spa_multihost = zpool_prop_default_numeric(ZPOOL_PROP_MULTIHOST);
	spa->spa_autotrim = zpool_prop_default_numeric(ZPOOL_PROP_AUTOTRIM);

	if (props != NULL) {
	spa_configfile_set(spa, props, B_FALSE);
	spa_sync_props(props, tx);
	}

	for (int i = 0; i < ndraid; i++)
	spa_feature_incr(spa, SPA_FEATURE_DRAID, tx);

	dmu_tx_commit(tx);

	spa->spa_sync_on = B_TRUE;
	txg_sync_start(dp);
	mmp_thread_start(spa);
	txg_wait_synced(dp, txg);

	spa_spawn_aux_threads(spa);

	spa_write_cachefile(spa, B_FALSE, B_TRUE);

	/*
	* Don't count references from objsets that are already closed
	* and are making their way through the eviction process.
	*/
	spa_evicting_os_wait(spa);
	spa->spa_minref = zfs_refcount_count(&spa->spa_refcount);
	spa->spa_load_state = SPA_LOAD_NONE;

	mutex_exit(&spa_namespace_lock);

	return (0);
	}

	/*
	* Import a non-root pool into the system.
	*/
	int
	spa_import(char pool, nvlist_t config, nvlist_t *props, uint64_t flags)
	{
	spa_t *spa;
	char *altroot = NULL;
	spa_load_state_t state = SPA_LOAD_IMPORT;
	zpool_load_policy_t policy;
	spa_mode_t mode = spa_mode_global;
	uint64_t readonly = B_FALSE;
	int error;
	nvlist_t *nvroot;
	nvlist_t spares, l2cache;
	uint_t nspares, nl2cache;

	/*
	* If a pool with this name exists, return failure.
	*/
	mutex_enter(&spa_namespace_lock);
	if (spa_lookup(pool) != NULL) {
	mutex_exit(&spa_namespace_lock);
	return (SET_ERROR(EEXIST));
	}

	/*
	* Create and initialize the spa structure.
	*/
	(void) nvlist_lookup_string(props,
	zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
	(void) nvlist_lookup_uint64(props,
	zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly);
	if (readonly)
	mode = SPA_MODE_READ;
	spa = spa_add(pool, config, altroot);
	spa->spa_import_flags = flags;

	/*
	* Verbatim import - Take a pool and insert it into the namespace
	* as if it had been loaded at boot.
	*/
	if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) {
	if (props != NULL)
	spa_configfile_set(spa, props, B_FALSE);

	spa_write_cachefile(spa, B_FALSE, B_TRUE);
	spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_IMPORT);
	zfs_dbgmsg("spa_import: verbatim import of %s", pool);
	mutex_exit(&spa_namespace_lock);
	return (0);
	}

	spa_activate(spa, mode);

	/*
	* Don't start async tasks until we know everything is healthy.
	*/
	spa_async_suspend(spa);

	zpool_get_load_policy(config, &policy);
	if (policy.zlp_rewind & ZPOOL_DO_REWIND)
	state = SPA_LOAD_RECOVER;

	spa->spa_config_source = SPA_CONFIG_SRC_TRYIMPORT;

	if (state != SPA_LOAD_RECOVER) {
	spa->spa_last_ubsync_txg = spa->spa_load_txg = 0;
	zfs_dbgmsg("spa_import: importing %s", pool);
	} else {
	zfs_dbgmsg("spa_import: importing %s, max_txg=%lld "
	"(RECOVERY MODE)", pool, (longlong_t)policy.zlp_txg);
	}
	error = spa_load_best(spa, state, policy.zlp_txg, policy.zlp_rewind);

	/*
	* Propagate anything learned while loading the pool and pass it
	* back to caller (i.e. rewind info, missing devices, etc).
	*/
	VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO,
	spa->spa_load_info) == 0);

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	/*
	* Toss any existing sparelist, as it doesn't have any validity
	* anymore, and conflicts with spa_has_spare().
	*/
	if (spa->spa_spares.sav_config) {
	nvlist_free(spa->spa_spares.sav_config);
	spa->spa_spares.sav_config = NULL;
	spa_load_spares(spa);
	}
	if (spa->spa_l2cache.sav_config) {
	nvlist_free(spa->spa_l2cache.sav_config);
	spa->spa_l2cache.sav_config = NULL;
	spa_load_l2cache(spa);
	}

	VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	&nvroot) == 0);
	spa_config_exit(spa, SCL_ALL, FTAG);

	if (props != NULL)
	spa_configfile_set(spa, props, B_FALSE);

	if (error != 0 \|\| (props && spa_writeable(spa) &&
	(error = spa_prop_set(spa, props)))) {
	spa_unload(spa);
	spa_deactivate(spa);
	spa_remove(spa);
	mutex_exit(&spa_namespace_lock);
	return (error);
	}

	spa_async_resume(spa);

	/*
	* Override any spares and level 2 cache devices as specified by
	* the user, as these may have correct device names/devids, etc.
	*/
	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
	&spares, &nspares) == 0) {
	if (spa->spa_spares.sav_config)
	VERIFY(nvlist_remove(spa->spa_spares.sav_config,
	ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0);
	else
	VERIFY(nvlist_alloc(&spa->spa_spares.sav_config,
	NV_UNIQUE_NAME, KM_SLEEP) == 0);
	VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
	ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	spa_load_spares(spa);
	spa_config_exit(spa, SCL_ALL, FTAG);
	spa->spa_spares.sav_sync = B_TRUE;
	}
	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
	&l2cache, &nl2cache) == 0) {
	if (spa->spa_l2cache.sav_config)
	VERIFY(nvlist_remove(spa->spa_l2cache.sav_config,
	ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0);
	else
	VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config,
	NV_UNIQUE_NAME, KM_SLEEP) == 0);
	VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config,
	ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	spa_load_l2cache(spa);
	spa_config_exit(spa, SCL_ALL, FTAG);
	spa->spa_l2cache.sav_sync = B_TRUE;
	}

	/*
	* Check for any removed devices.
	*/
	if (spa->spa_autoreplace) {
	spa_aux_check_removed(&spa->spa_spares);
	spa_aux_check_removed(&spa->spa_l2cache);
	}

	if (spa_writeable(spa)) {
	/*
	* Update the config cache to include the newly-imported pool.
	*/
	spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);
	}

	/*
	* It's possible that the pool was expanded while it was exported.
	* We kick off an async task to handle this for us.
	*/
	spa_async_request(spa, SPA_ASYNC_AUTOEXPAND);

	spa_history_log_version(spa, "import", NULL);

	spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_IMPORT);

	mutex_exit(&spa_namespace_lock);

	zvol_create_minors_recursive(pool);

	return (0);
	}

	nvlist_t *
	spa_tryimport(nvlist_t *tryconfig)
	{
	nvlist_t *config = NULL;
	char poolname, cachefile;
	spa_t *spa;
	uint64_t state;
	int error;
	zpool_load_policy_t policy;

	if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname))
	return (NULL);

	if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state))
	return (NULL);

	/*
	* Create and initialize the spa structure.
	*/
	mutex_enter(&spa_namespace_lock);
	spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL);
	spa_activate(spa, SPA_MODE_READ);

	/*
	* Rewind pool if a max txg was provided.
	*/
	zpool_get_load_policy(spa->spa_config, &policy);
	if (policy.zlp_txg != UINT64_MAX) {
	spa->spa_load_max_txg = policy.zlp_txg;
	spa->spa_extreme_rewind = B_TRUE;
	zfs_dbgmsg("spa_tryimport: importing %s, max_txg=%lld",
	poolname, (longlong_t)policy.zlp_txg);
	} else {
	zfs_dbgmsg("spa_tryimport: importing %s", poolname);
	}

	if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_CACHEFILE, &cachefile)
	== 0) {
	zfs_dbgmsg("spa_tryimport: using cachefile '%s'", cachefile);
	spa->spa_config_source = SPA_CONFIG_SRC_CACHEFILE;
	} else {
	spa->spa_config_source = SPA_CONFIG_SRC_SCAN;
	}

	error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING);

	/*
	* If 'tryconfig' was at least parsable, return the current config.
	*/
	if (spa->spa_root_vdev != NULL) {
	config = spa_config_generate(spa, NULL, -1ULL, B_TRUE);
	VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME,
	poolname) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
	state) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP,
	spa->spa_uberblock.ub_timestamp) == 0);
	VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO,
	spa->spa_load_info) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_ERRATA,
	spa->spa_errata) == 0);

	/*
	* If the bootfs property exists on this pool then we
	* copy it out so that external consumers can tell which
	* pools are bootable.
	*/
	if ((!error \|\| error == EEXIST) && spa->spa_bootfs) {
	char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP);

	/*
	* We have to play games with the name since the
	* pool was opened as TRYIMPORT_NAME.
	*/
	if (dsl_dsobj_to_dsname(spa_name(spa),
	spa->spa_bootfs, tmpname) == 0) {
	char *cp;
	char *dsname;

	dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP);

	cp = strchr(tmpname, '/');
	if (cp == NULL) {
	(void) strlcpy(dsname, tmpname,
	MAXPATHLEN);
	} else {
	(void) snprintf(dsname, MAXPATHLEN,
	"%s/%s", poolname, ++cp);
	}
	VERIFY(nvlist_add_string(config,
	ZPOOL_CONFIG_BOOTFS, dsname) == 0);
	kmem_free(dsname, MAXPATHLEN);
	}
	kmem_free(tmpname, MAXPATHLEN);
	}

	/*
	* Add the list of hot spares and level 2 cache devices.
	*/
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	spa_add_spares(spa, config);
	spa_add_l2cache(spa, config);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	}

	spa_unload(spa);
	spa_deactivate(spa);
	spa_remove(spa);
	mutex_exit(&spa_namespace_lock);

	return (config);
	}

	/*
	* Pool export/destroy
	*
	* The act of destroying or exporting a pool is very simple. We make sure there
	* is no more pending I/O and any references to the pool are gone. Then, we
	* update the pool state and sync all the labels to disk, removing the
	* configuration from the cache afterwards. If the 'hardforce' flag is set, then
	* we don't sync the labels or remove the configuration cache.
	*/
	static int
	spa_export_common(const char pool, int new_state, nvlist_t *oldconfig,
	boolean_t force, boolean_t hardforce)
	{
	int error;
	spa_t *spa;

	if (oldconfig)
	*oldconfig = NULL;

	if (!(spa_mode_global & SPA_MODE_WRITE))
	return (SET_ERROR(EROFS));

	mutex_enter(&spa_namespace_lock);
	if ((spa = spa_lookup(pool)) == NULL) {
	mutex_exit(&spa_namespace_lock);
	return (SET_ERROR(ENOENT));
	}

	if (spa->spa_is_exporting) {
	/* the pool is being exported by another thread */
	mutex_exit(&spa_namespace_lock);
	return (SET_ERROR(ZFS_ERR_EXPORT_IN_PROGRESS));
	}
	spa->spa_is_exporting = B_TRUE;

	/*
	* Put a hold on the pool, drop the namespace lock, stop async tasks,
	* reacquire the namespace lock, and see if we can export.
	*/
	spa_open_ref(spa, FTAG);
	mutex_exit(&spa_namespace_lock);
	spa_async_suspend(spa);
	if (spa->spa_zvol_taskq) {
	zvol_remove_minors(spa, spa_name(spa), B_TRUE);
	taskq_wait(spa->spa_zvol_taskq);
	}
	mutex_enter(&spa_namespace_lock);
	spa_close(spa, FTAG);

	if (spa->spa_state == POOL_STATE_UNINITIALIZED)
	goto export_spa;
	/*
	* The pool will be in core if it's openable, in which case we can
	* modify its state. Objsets may be open only because they're dirty,
	* so we have to force it to sync before checking spa_refcnt.
	*/
	if (spa->spa_sync_on) {
	txg_wait_synced(spa->spa_dsl_pool, 0);
	spa_evicting_os_wait(spa);
	}

	/*
	* A pool cannot be exported or destroyed if there are active
	* references. If we are resetting a pool, allow references by
	* fault injection handlers.
	*/
	if (!spa_refcount_zero(spa) \|\| (spa->spa_inject_ref != 0)) {
	error = SET_ERROR(EBUSY);
	goto fail;
	}

	if (spa->spa_sync_on) {
	/*
	* A pool cannot be exported if it has an active shared spare.
	* This is to prevent other pools stealing the active spare
	* from an exported pool. At user's own will, such pool can
	* be forcedly exported.
	*/
	if (!force && new_state == POOL_STATE_EXPORTED &&
	spa_has_active_shared_spare(spa)) {
	error = SET_ERROR(EXDEV);
	goto fail;
	}

	/*
	* We're about to export or destroy this pool. Make sure
	* we stop all initialization and trim activity here before
	* we set the spa_final_txg. This will ensure that all
	* dirty data resulting from the initialization is
	* committed to disk before we unload the pool.
	*/
	if (spa->spa_root_vdev != NULL) {
	vdev_t *rvd = spa->spa_root_vdev;
	vdev_initialize_stop_all(rvd, VDEV_INITIALIZE_ACTIVE);
	vdev_trim_stop_all(rvd, VDEV_TRIM_ACTIVE);
	vdev_autotrim_stop_all(spa);
	vdev_rebuild_stop_all(spa);
	}

	/*
	* We want this to be reflected on every label,
	* so mark them all dirty. spa_unload() will do the
	* final sync that pushes these changes out.
	*/
	if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) {
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	spa->spa_state = new_state;
	spa->spa_final_txg = spa_last_synced_txg(spa) +
	TXG_DEFER_SIZE + 1;
	vdev_config_dirty(spa->spa_root_vdev);
	spa_config_exit(spa, SCL_ALL, FTAG);
	}
	}

	export_spa:
	if (new_state == POOL_STATE_DESTROYED)
	spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_DESTROY);
	else if (new_state == POOL_STATE_EXPORTED)
	spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_EXPORT);

	if (spa->spa_state != POOL_STATE_UNINITIALIZED) {
	spa_unload(spa);
	spa_deactivate(spa);
	}

	if (oldconfig && spa->spa_config)
	VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0);

	if (new_state != POOL_STATE_UNINITIALIZED) {
	if (!hardforce)
	spa_write_cachefile(spa, B_TRUE, B_TRUE);
	spa_remove(spa);
	} else {
	/*
	* If spa_remove() is not called for this spa_t and
	* there is any possibility that it can be reused,
	* we make sure to reset the exporting flag.
	*/
	spa->spa_is_exporting = B_FALSE;
	}

	mutex_exit(&spa_namespace_lock);
	return (0);

	fail:
	spa->spa_is_exporting = B_FALSE;
	spa_async_resume(spa);
	mutex_exit(&spa_namespace_lock);
	return (error);
	}

	/*
	* Destroy a storage pool.
	*/
	int
	spa_destroy(const char *pool)
	{
	return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL,
	B_FALSE, B_FALSE));
	}

	/*
	* Export a storage pool.
	*/
	int
	spa_export(const char pool, nvlist_t *oldconfig, boolean_t force,
	boolean_t hardforce)
	{
	return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig,
	force, hardforce));
	}

	/*
	* Similar to spa_export(), this unloads the spa_t without actually removing it
	* from the namespace in any way.
	*/
	int
	spa_reset(const char *pool)
	{
	return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL,
	B_FALSE, B_FALSE));
	}

	/*
	* ==========================================================================
	* Device manipulation
	* ==========================================================================
	*/

	/*
	* This is called as a synctask to increment the draid feature flag
	*/
	static void
	spa_draid_feature_incr(void arg, dmu_tx_t tx)
	{
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	int draid = (int)(uintptr_t)arg;

	for (int c = 0; c < draid; c++)
	spa_feature_incr(spa, SPA_FEATURE_DRAID, tx);
	}

	/*
	* Add a device to a storage pool.
	*/
	int
	spa_vdev_add(spa_t spa, nvlist_t nvroot)
	{
	uint64_t txg, ndraid = 0;
	int error;
	vdev_t *rvd = spa->spa_root_vdev;
	vdev_t vd, tvd;
	nvlist_t spares, l2cache;
	uint_t nspares, nl2cache;

	ASSERT(spa_writeable(spa));

	txg = spa_vdev_enter(spa);

	if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0,
	VDEV_ALLOC_ADD)) != 0)
	return (spa_vdev_exit(spa, NULL, txg, error));

	spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares,
	&nspares) != 0)
	nspares = 0;

	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache,
	&nl2cache) != 0)
	nl2cache = 0;

	if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0)
	return (spa_vdev_exit(spa, vd, txg, EINVAL));

	if (vd->vdev_children != 0 &&
	(error = vdev_create(vd, txg, B_FALSE)) != 0) {
	return (spa_vdev_exit(spa, vd, txg, error));
	}

	/*
	* The virtual dRAID spares must be added after vdev tree is created
	* and the vdev guids are generated. The guid of their associated
	* dRAID is stored in the config and used when opening the spare.
	*/
	if ((error = vdev_draid_spare_create(nvroot, vd, &ndraid,
	rvd->vdev_children)) == 0) {
	if (ndraid > 0 && nvlist_lookup_nvlist_array(nvroot,
	ZPOOL_CONFIG_SPARES, &spares, &nspares) != 0)
	nspares = 0;
	} else {
	return (spa_vdev_exit(spa, vd, txg, error));
	}

	/*
	* We must validate the spares and l2cache devices after checking the
	* children. Otherwise, vdev_inuse() will blindly overwrite the spare.
	*/
	if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0)
	return (spa_vdev_exit(spa, vd, txg, error));

	/*
	* If we are in the middle of a device removal, we can only add
	* devices which match the existing devices in the pool.
	* If we are in the middle of a removal, or have some indirect
	* vdevs, we can not add raidz or dRAID top levels.
	*/
	if (spa->spa_vdev_removal != NULL \|\|
	spa->spa_removing_phys.sr_prev_indirect_vdev != -1) {
	for (int c = 0; c < vd->vdev_children; c++) {
	tvd = vd->vdev_child[c];
	if (spa->spa_vdev_removal != NULL &&
	tvd->vdev_ashift != spa->spa_max_ashift) {
	return (spa_vdev_exit(spa, vd, txg, EINVAL));
	}
	/* Fail if top level vdev is raidz or a dRAID */
	if (vdev_get_nparity(tvd) != 0)
	return (spa_vdev_exit(spa, vd, txg, EINVAL));

	/*
	* Need the top level mirror to be
	* a mirror of leaf vdevs only
	*/
	if (tvd->vdev_ops == &vdev_mirror_ops) {
	for (uint64_t cid = 0;
	cid < tvd->vdev_children; cid++) {
	vdev_t *cvd = tvd->vdev_child[cid];
	if (!cvd->vdev_ops->vdev_op_leaf) {
	return (spa_vdev_exit(spa, vd,
	txg, EINVAL));
	}
	}
	}
	}
	}

	for (int c = 0; c < vd->vdev_children; c++) {
	tvd = vd->vdev_child[c];
	vdev_remove_child(vd, tvd);
	tvd->vdev_id = rvd->vdev_children;
	vdev_add_child(rvd, tvd);
	vdev_config_dirty(tvd);
	}

	if (nspares != 0) {
	spa_set_aux_vdevs(&spa->spa_spares, spares, nspares,
	ZPOOL_CONFIG_SPARES);
	spa_load_spares(spa);
	spa->spa_spares.sav_sync = B_TRUE;
	}

	if (nl2cache != 0) {
	spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache,
	ZPOOL_CONFIG_L2CACHE);
	spa_load_l2cache(spa);
	spa->spa_l2cache.sav_sync = B_TRUE;
	}

	/*
	* We can't increment a feature while holding spa_vdev so we
	* have to do it in a synctask.
	*/
	if (ndraid != 0) {
	dmu_tx_t *tx;

	tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
	dsl_sync_task_nowait(spa->spa_dsl_pool, spa_draid_feature_incr,
	(void *)(uintptr_t)ndraid, tx);
	dmu_tx_commit(tx);
	}

	/*
	* We have to be careful when adding new vdevs to an existing pool.
	* If other threads start allocating from these vdevs before we
	* sync the config cache, and we lose power, then upon reboot we may
	* fail to open the pool because there are DVAs that the config cache
	* can't translate. Therefore, we first add the vdevs without
	* initializing metaslabs; sync the config cache (via spa_vdev_exit());
	* and then let spa_config_update() initialize the new metaslabs.
	*
	* spa_load() checks for added-but-not-initialized vdevs, so that
	* if we lose power at any point in this sequence, the remaining
	* steps will be completed the next time we load the pool.
	*/
	(void) spa_vdev_exit(spa, vd, txg, 0);

	mutex_enter(&spa_namespace_lock);
	spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);
	spa_event_notify(spa, NULL, NULL, ESC_ZFS_VDEV_ADD);
	mutex_exit(&spa_namespace_lock);

	return (0);
	}

	/*
	* Attach a device to a mirror. The arguments are the path to any device
	* in the mirror, and the nvroot for the new device. If the path specifies
	* a device that is not mirrored, we automatically insert the mirror vdev.
	*
	* If 'replacing' is specified, the new device is intended to replace the
	* existing device; in this case the two devices are made into their own
	* mirror using the 'replacing' vdev, which is functionally identical to
	* the mirror vdev (it actually reuses all the same ops) but has a few
	* extra rules: you can't attach to it after it's been created, and upon
	* completion of resilvering, the first disk (the one being replaced)
	* is automatically detached.
	*
	* If 'rebuild' is specified, then sequential reconstruction (a.ka. rebuild)
	* should be performed instead of traditional healing reconstruction. From
	* an administrators perspective these are both resilver operations.
	*/
	int
	spa_vdev_attach(spa_t spa, uint64_t guid, nvlist_t nvroot, int replacing,
	int rebuild)
	{
	uint64_t txg, dtl_max_txg;
	vdev_t *rvd = spa->spa_root_vdev;
	vdev_t oldvd, newvd, newrootvd, pvd, *tvd;
	vdev_ops_t *pvops;
	char oldvdpath, newvdpath;
	int newvd_isspare;
	int error;

	ASSERT(spa_writeable(spa));

	txg = spa_vdev_enter(spa);

	oldvd = spa_lookup_by_guid(spa, guid, B_FALSE);

	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) {
	error = (spa_has_checkpoint(spa)) ?
	ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT;
	return (spa_vdev_exit(spa, NULL, txg, error));
	}

	if (rebuild) {
	if (!spa_feature_is_enabled(spa, SPA_FEATURE_DEVICE_REBUILD))
	return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));

	if (dsl_scan_resilvering(spa_get_dsl(spa)))
	return (spa_vdev_exit(spa, NULL, txg,
	ZFS_ERR_RESILVER_IN_PROGRESS));
	} else {
	if (vdev_rebuild_active(rvd))
	return (spa_vdev_exit(spa, NULL, txg,
	ZFS_ERR_REBUILD_IN_PROGRESS));
	}

	if (spa->spa_vdev_removal != NULL)
	return (spa_vdev_exit(spa, NULL, txg, EBUSY));

	if (oldvd == NULL)
	return (spa_vdev_exit(spa, NULL, txg, ENODEV));

	if (!oldvd->vdev_ops->vdev_op_leaf)
	return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));

	pvd = oldvd->vdev_parent;

	if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0,
	VDEV_ALLOC_ATTACH)) != 0)
	return (spa_vdev_exit(spa, NULL, txg, EINVAL));

	if (newrootvd->vdev_children != 1)
	return (spa_vdev_exit(spa, newrootvd, txg, EINVAL));

	newvd = newrootvd->vdev_child[0];

	if (!newvd->vdev_ops->vdev_op_leaf)
	return (spa_vdev_exit(spa, newrootvd, txg, EINVAL));

	if ((error = vdev_create(newrootvd, txg, replacing)) != 0)
	return (spa_vdev_exit(spa, newrootvd, txg, error));

	/*
	* Spares can't replace logs
	*/
	if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare)
	return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));

	/*
	* A dRAID spare can only replace a child of its parent dRAID vdev.
	*/
	if (newvd->vdev_ops == &vdev_draid_spare_ops &&
	oldvd->vdev_top != vdev_draid_spare_get_parent(newvd)) {
	return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
	}

	if (rebuild) {
	/*
	* For rebuilds, the top vdev must support reconstruction
	* using only space maps. This means the only allowable
	* vdevs types are the root vdev, a mirror, or dRAID.
	*/
	tvd = pvd;
	if (pvd->vdev_top != NULL)
	tvd = pvd->vdev_top;

	if (tvd->vdev_ops != &vdev_mirror_ops &&
	tvd->vdev_ops != &vdev_root_ops &&
	tvd->vdev_ops != &vdev_draid_ops) {
	return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
	}
	}

	if (!replacing) {
	/*
	* For attach, the only allowable parent is a mirror or the root
	* vdev.
	*/
	if (pvd->vdev_ops != &vdev_mirror_ops &&
	pvd->vdev_ops != &vdev_root_ops)
	return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));

	pvops = &vdev_mirror_ops;
	} else {
	/*
	* Active hot spares can only be replaced by inactive hot
	* spares.
	*/
	if (pvd->vdev_ops == &vdev_spare_ops &&
	oldvd->vdev_isspare &&
	!spa_has_spare(spa, newvd->vdev_guid))
	return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));

	/*
	* If the source is a hot spare, and the parent isn't already a
	* spare, then we want to create a new hot spare. Otherwise, we
	* want to create a replacing vdev. The user is not allowed to
	* attach to a spared vdev child unless the 'isspare' state is
	* the same (spare replaces spare, non-spare replaces
	* non-spare).
	*/
	if (pvd->vdev_ops == &vdev_replacing_ops &&
	spa_version(spa) < SPA_VERSION_MULTI_REPLACE) {
	return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
	} else if (pvd->vdev_ops == &vdev_spare_ops &&
	newvd->vdev_isspare != oldvd->vdev_isspare) {
	return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));
	}

	if (newvd->vdev_isspare)
	pvops = &vdev_spare_ops;
	else
	pvops = &vdev_replacing_ops;
	}

	/*
	* Make sure the new device is big enough.
	*/
	if (newvd->vdev_asize < vdev_get_min_asize(oldvd))
	return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW));

	/*
	* The new device cannot have a higher alignment requirement
	* than the top-level vdev.
	*/
	if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift)
	return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP));

	/*
	* If this is an in-place replacement, update oldvd's path and devid
	* to make it distinguishable from newvd, and unopenable from now on.
	*/
	if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) {
	spa_strfree(oldvd->vdev_path);
	oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5,
	KM_SLEEP);
	(void) snprintf(oldvd->vdev_path, strlen(newvd->vdev_path) + 5,
	"%s/%s", newvd->vdev_path, "old");
	if (oldvd->vdev_devid != NULL) {
	spa_strfree(oldvd->vdev_devid);
	oldvd->vdev_devid = NULL;
	}
	}

	/*
	* If the parent is not a mirror, or if we're replacing, insert the new
	* mirror/replacing/spare vdev above oldvd.
	*/
	if (pvd->vdev_ops != pvops)
	pvd = vdev_add_parent(oldvd, pvops);

	ASSERT(pvd->vdev_top->vdev_parent == rvd);
	ASSERT(pvd->vdev_ops == pvops);
	ASSERT(oldvd->vdev_parent == pvd);

	/*
	* Extract the new device from its root and add it to pvd.
	*/
	vdev_remove_child(newrootvd, newvd);
	newvd->vdev_id = pvd->vdev_children;
	newvd->vdev_crtxg = oldvd->vdev_crtxg;
	vdev_add_child(pvd, newvd);

	/*
	* Reevaluate the parent vdev state.
	*/
	vdev_propagate_state(pvd);

	tvd = newvd->vdev_top;
	ASSERT(pvd->vdev_top == tvd);
	ASSERT(tvd->vdev_parent == rvd);

	vdev_config_dirty(tvd);

	/*
	* Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account
	* for any dmu_sync-ed blocks. It will propagate upward when
	* spa_vdev_exit() calls vdev_dtl_reassess().
	*/
	dtl_max_txg = txg + TXG_CONCURRENT_STATES;

	vdev_dtl_dirty(newvd, DTL_MISSING,
	TXG_INITIAL, dtl_max_txg - TXG_INITIAL);

	if (newvd->vdev_isspare) {
	spa_spare_activate(newvd);
	spa_event_notify(spa, newvd, NULL, ESC_ZFS_VDEV_SPARE);
	}

	oldvdpath = spa_strdup(oldvd->vdev_path);
	newvdpath = spa_strdup(newvd->vdev_path);
	newvd_isspare = newvd->vdev_isspare;

	/*
	* Mark newvd's DTL dirty in this txg.
	*/
	vdev_dirty(tvd, VDD_DTL, newvd, txg);

	/*
	* Schedule the resilver or rebuild to restart in the future. We do
	* this to ensure that dmu_sync-ed blocks have been stitched into the
	* respective datasets.
	*/
	if (rebuild) {
	newvd->vdev_rebuild_txg = txg;

	vdev_rebuild(tvd);
	} else {
	newvd->vdev_resilver_txg = txg;

	if (dsl_scan_resilvering(spa_get_dsl(spa)) &&
	spa_feature_is_enabled(spa, SPA_FEATURE_RESILVER_DEFER)) {
	vdev_defer_resilver(newvd);
	} else {
	dsl_scan_restart_resilver(spa->spa_dsl_pool,
	dtl_max_txg);
	}
	}

	if (spa->spa_bootfs)
	spa_event_notify(spa, newvd, NULL, ESC_ZFS_BOOTFS_VDEV_ATTACH);

	spa_event_notify(spa, newvd, NULL, ESC_ZFS_VDEV_ATTACH);

	/*
	* Commit the config
	*/
	(void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0);

	spa_history_log_internal(spa, "vdev attach", NULL,
	"%s vdev=%s %s vdev=%s",
	replacing && newvd_isspare ? "spare in" :
	replacing ? "replace" : "attach", newvdpath,
	replacing ? "for" : "to", oldvdpath);

	spa_strfree(oldvdpath);
	spa_strfree(newvdpath);

	return (0);
	}

	/*
	* Detach a device from a mirror or replacing vdev.
	*
	* If 'replace_done' is specified, only detach if the parent
	* is a replacing vdev.
	*/
	int
	spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done)
	{
	uint64_t txg;
	int error;
	vdev_t *rvd __maybe_unused = spa->spa_root_vdev;
	vdev_t vd, pvd, cvd, tvd;
	boolean_t unspare = B_FALSE;
	uint64_t unspare_guid = 0;
	char *vdpath;

	ASSERT(spa_writeable(spa));

	txg = spa_vdev_detach_enter(spa, guid);

	vd = spa_lookup_by_guid(spa, guid, B_FALSE);

	/*
	* Besides being called directly from the userland through the
	* ioctl interface, spa_vdev_detach() can be potentially called
	* at the end of spa_vdev_resilver_done().
	*
	* In the regular case, when we have a checkpoint this shouldn't
	* happen as we never empty the DTLs of a vdev during the scrub
	* [see comment in dsl_scan_done()]. Thus spa_vdev_resilvering_done()
	* should never get here when we have a checkpoint.
	*
	* That said, even in a case when we checkpoint the pool exactly
	* as spa_vdev_resilver_done() calls this function everything
	* should be fine as the resilver will return right away.
	*/
	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) {
	error = (spa_has_checkpoint(spa)) ?
	ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT;
	return (spa_vdev_exit(spa, NULL, txg, error));
	}

	if (vd == NULL)
	return (spa_vdev_exit(spa, NULL, txg, ENODEV));

	if (!vd->vdev_ops->vdev_op_leaf)
	return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));

	pvd = vd->vdev_parent;

	/*
	* If the parent/child relationship is not as expected, don't do it.
	* Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing
	* vdev that's replacing B with C. The user's intent in replacing
	* is to go from M(A,B) to M(A,C). If the user decides to cancel
	* the replace by detaching C, the expected behavior is to end up
	* M(A,B). But suppose that right after deciding to detach C,
	* the replacement of B completes. We would have M(A,C), and then
	* ask to detach C, which would leave us with just A -- not what
	* the user wanted. To prevent this, we make sure that the
	* parent/child relationship hasn't changed -- in this example,
	* that C's parent is still the replacing vdev R.
	*/
	if (pvd->vdev_guid != pguid && pguid != 0)
	return (spa_vdev_exit(spa, NULL, txg, EBUSY));

	/*
	* Only 'replacing' or 'spare' vdevs can be replaced.
	*/
	if (replace_done && pvd->vdev_ops != &vdev_replacing_ops &&
	pvd->vdev_ops != &vdev_spare_ops)
	return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));

	ASSERT(pvd->vdev_ops != &vdev_spare_ops \|\|
	spa_version(spa) >= SPA_VERSION_SPARES);

	/*
	* Only mirror, replacing, and spare vdevs support detach.
	*/
	if (pvd->vdev_ops != &vdev_replacing_ops &&
	pvd->vdev_ops != &vdev_mirror_ops &&
	pvd->vdev_ops != &vdev_spare_ops)
	return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));

	/*
	* If this device has the only valid copy of some data,
	* we cannot safely detach it.
	*/
	if (vdev_dtl_required(vd))
	return (spa_vdev_exit(spa, NULL, txg, EBUSY));

	ASSERT(pvd->vdev_children >= 2);

	/*
	* If we are detaching the second disk from a replacing vdev, then
	* check to see if we changed the original vdev's path to have "/old"
	* at the end in spa_vdev_attach(). If so, undo that change now.
	*/
	if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 &&
	vd->vdev_path != NULL) {
	size_t len = strlen(vd->vdev_path);

	for (int c = 0; c < pvd->vdev_children; c++) {
	cvd = pvd->vdev_child[c];

	if (cvd == vd \|\| cvd->vdev_path == NULL)
	continue;

	if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 &&
	strcmp(cvd->vdev_path + len, "/old") == 0) {
	spa_strfree(cvd->vdev_path);
	cvd->vdev_path = spa_strdup(vd->vdev_path);
	break;
	}
	}
	}

	/*
	* If we are detaching the original disk from a normal spare, then it
	* implies that the spare should become a real disk, and be removed
	* from the active spare list for the pool. dRAID spares on the
	* other hand are coupled to the pool and thus should never be removed
	* from the spares list.
	*/
	if (pvd->vdev_ops == &vdev_spare_ops && vd->vdev_id == 0) {
	vdev_t *last_cvd = pvd->vdev_child[pvd->vdev_children - 1];

	if (last_cvd->vdev_isspare &&
	last_cvd->vdev_ops != &vdev_draid_spare_ops) {
	unspare = B_TRUE;
	}
	}

	/*
	* Erase the disk labels so the disk can be used for other things.
	* This must be done after all other error cases are handled,
	* but before we disembowel vd (so we can still do I/O to it).
	* But if we can't do it, don't treat the error as fatal --
	* it may be that the unwritability of the disk is the reason
	* it's being detached!
	*/
	error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE);

	/*
	* Remove vd from its parent and compact the parent's children.
	*/
	vdev_remove_child(pvd, vd);
	vdev_compact_children(pvd);

	/*
	* Remember one of the remaining children so we can get tvd below.
	*/
	cvd = pvd->vdev_child[pvd->vdev_children - 1];

	/*
	* If we need to remove the remaining child from the list of hot spares,
	* do it now, marking the vdev as no longer a spare in the process.
	* We must do this before vdev_remove_parent(), because that can
	* change the GUID if it creates a new toplevel GUID. For a similar
	* reason, we must remove the spare now, in the same txg as the detach;
	* otherwise someone could attach a new sibling, change the GUID, and
	* the subsequent attempt to spa_vdev_remove(unspare_guid) would fail.
	*/
	if (unspare) {
	ASSERT(cvd->vdev_isspare);
	spa_spare_remove(cvd);
	unspare_guid = cvd->vdev_guid;
	(void) spa_vdev_remove(spa, unspare_guid, B_TRUE);
	cvd->vdev_unspare = B_TRUE;
	}

	/*
	* If the parent mirror/replacing vdev only has one child,
	* the parent is no longer needed. Remove it from the tree.
	*/
	if (pvd->vdev_children == 1) {
	if (pvd->vdev_ops == &vdev_spare_ops)
	cvd->vdev_unspare = B_FALSE;
	vdev_remove_parent(cvd);
	}

	/*
	* We don't set tvd until now because the parent we just removed
	* may have been the previous top-level vdev.
	*/
	tvd = cvd->vdev_top;
	ASSERT(tvd->vdev_parent == rvd);

	/*
	* Reevaluate the parent vdev state.
	*/
	vdev_propagate_state(cvd);

	/*
	* If the 'autoexpand' property is set on the pool then automatically
	* try to expand the size of the pool. For example if the device we
	* just detached was smaller than the others, it may be possible to
	* add metaslabs (i.e. grow the pool). We need to reopen the vdev
	* first so that we can obtain the updated sizes of the leaf vdevs.
	*/
	if (spa->spa_autoexpand) {
	vdev_reopen(tvd);
	vdev_expand(tvd, txg);
	}

	vdev_config_dirty(tvd);

	/*
	* Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that
	* vd->vdev_detached is set and free vd's DTL object in syncing context.
	* But first make sure we're not on any other txg's DTL list, to
	* prevent vd from being accessed after it's freed.
	*/
	vdpath = spa_strdup(vd->vdev_path ? vd->vdev_path : "none");
	for (int t = 0; t < TXG_SIZE; t++)
	(void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t);
	vd->vdev_detached = B_TRUE;
	vdev_dirty(tvd, VDD_DTL, vd, txg);

	spa_event_notify(spa, vd, NULL, ESC_ZFS_VDEV_REMOVE);
	spa_notify_waiters(spa);

	/* hang on to the spa before we release the lock */
	spa_open_ref(spa, FTAG);

	error = spa_vdev_exit(spa, vd, txg, 0);

	spa_history_log_internal(spa, "detach", NULL,
	"vdev=%s", vdpath);
	spa_strfree(vdpath);

	/*
	* If this was the removal of the original device in a hot spare vdev,
	* then we want to go through and remove the device from the hot spare
	* list of every other pool.
	*/
	if (unspare) {
	spa_t *altspa = NULL;

	mutex_enter(&spa_namespace_lock);
	while ((altspa = spa_next(altspa)) != NULL) {
	if (altspa->spa_state != POOL_STATE_ACTIVE \|\|
	altspa == spa)
	continue;

	spa_open_ref(altspa, FTAG);
	mutex_exit(&spa_namespace_lock);
	(void) spa_vdev_remove(altspa, unspare_guid, B_TRUE);
	mutex_enter(&spa_namespace_lock);
	spa_close(altspa, FTAG);
	}
	mutex_exit(&spa_namespace_lock);

	/* search the rest of the vdevs for spares to remove */
	spa_vdev_resilver_done(spa);
	}

	/* all done with the spa; OK to release */
	mutex_enter(&spa_namespace_lock);
	spa_close(spa, FTAG);
	mutex_exit(&spa_namespace_lock);

	return (error);
	}

	static int
	spa_vdev_initialize_impl(spa_t *spa, uint64_t guid, uint64_t cmd_type,
	list_t *vd_list)
	{
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	spa_config_enter(spa, SCL_CONFIG \| SCL_STATE, FTAG, RW_READER);

	/* Look up vdev and ensure it's a leaf. */
	vdev_t *vd = spa_lookup_by_guid(spa, guid, B_FALSE);
	if (vd == NULL \|\| vd->vdev_detached) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (SET_ERROR(ENODEV));
	} else if (!vd->vdev_ops->vdev_op_leaf \|\| !vdev_is_concrete(vd)) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (SET_ERROR(EINVAL));
	} else if (!vdev_writeable(vd)) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (SET_ERROR(EROFS));
	}
	mutex_enter(&vd->vdev_initialize_lock);
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);

	/*
	* When we activate an initialize action we check to see
	* if the vdev_initialize_thread is NULL. We do this instead
	* of using the vdev_initialize_state since there might be
	* a previous initialization process which has completed but
	* the thread is not exited.
	*/
	if (cmd_type == POOL_INITIALIZE_START &&
	(vd->vdev_initialize_thread != NULL \|\|
	vd->vdev_top->vdev_removing)) {
	mutex_exit(&vd->vdev_initialize_lock);
	return (SET_ERROR(EBUSY));
	} else if (cmd_type == POOL_INITIALIZE_CANCEL &&
	(vd->vdev_initialize_state != VDEV_INITIALIZE_ACTIVE &&
	vd->vdev_initialize_state != VDEV_INITIALIZE_SUSPENDED)) {
	mutex_exit(&vd->vdev_initialize_lock);
	return (SET_ERROR(ESRCH));
	} else if (cmd_type == POOL_INITIALIZE_SUSPEND &&
	vd->vdev_initialize_state != VDEV_INITIALIZE_ACTIVE) {
	mutex_exit(&vd->vdev_initialize_lock);
	return (SET_ERROR(ESRCH));
	}

	switch (cmd_type) {
	case POOL_INITIALIZE_START:
	vdev_initialize(vd);
	break;
	case POOL_INITIALIZE_CANCEL:
	vdev_initialize_stop(vd, VDEV_INITIALIZE_CANCELED, vd_list);
	break;
	case POOL_INITIALIZE_SUSPEND:
	vdev_initialize_stop(vd, VDEV_INITIALIZE_SUSPENDED, vd_list);
	break;
	default:
	panic("invalid cmd_type %llu", (unsigned long long)cmd_type);
	}
	mutex_exit(&vd->vdev_initialize_lock);

	return (0);
	}

	int
	spa_vdev_initialize(spa_t spa, nvlist_t nv, uint64_t cmd_type,
	nvlist_t *vdev_errlist)
	{
	int total_errors = 0;
	list_t vd_list;

	list_create(&vd_list, sizeof (vdev_t),
	offsetof(vdev_t, vdev_initialize_node));

	/*
	* We hold the namespace lock through the whole function
	* to prevent any changes to the pool while we're starting or
	* stopping initialization. The config and state locks are held so that
	* we can properly assess the vdev state before we commit to
	* the initializing operation.
	*/
	mutex_enter(&spa_namespace_lock);

	for (nvpair_t *pair = nvlist_next_nvpair(nv, NULL);
	pair != NULL; pair = nvlist_next_nvpair(nv, pair)) {
	uint64_t vdev_guid = fnvpair_value_uint64(pair);

	int error = spa_vdev_initialize_impl(spa, vdev_guid, cmd_type,
	&vd_list);
	if (error != 0) {
	char guid_as_str[MAXNAMELEN];

	(void) snprintf(guid_as_str, sizeof (guid_as_str),
	"%llu", (unsigned long long)vdev_guid);
	fnvlist_add_int64(vdev_errlist, guid_as_str, error);
	total_errors++;
	}
	}

	/* Wait for all initialize threads to stop. */
	vdev_initialize_stop_wait(spa, &vd_list);

	/* Sync out the initializing state */
	txg_wait_synced(spa->spa_dsl_pool, 0);
	mutex_exit(&spa_namespace_lock);

	list_destroy(&vd_list);

	return (total_errors);
	}

	static int
	spa_vdev_trim_impl(spa_t *spa, uint64_t guid, uint64_t cmd_type,
	uint64_t rate, boolean_t partial, boolean_t secure, list_t *vd_list)
	{
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	spa_config_enter(spa, SCL_CONFIG \| SCL_STATE, FTAG, RW_READER);

	/* Look up vdev and ensure it's a leaf. */
	vdev_t *vd = spa_lookup_by_guid(spa, guid, B_FALSE);
	if (vd == NULL \|\| vd->vdev_detached) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (SET_ERROR(ENODEV));
	} else if (!vd->vdev_ops->vdev_op_leaf \|\| !vdev_is_concrete(vd)) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (SET_ERROR(EINVAL));
	} else if (!vdev_writeable(vd)) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (SET_ERROR(EROFS));
	} else if (!vd->vdev_has_trim) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (SET_ERROR(EOPNOTSUPP));
	} else if (secure && !vd->vdev_has_securetrim) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (SET_ERROR(EOPNOTSUPP));
	}
	mutex_enter(&vd->vdev_trim_lock);
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);

	/*
	* When we activate a TRIM action we check to see if the
	* vdev_trim_thread is NULL. We do this instead of using the
	* vdev_trim_state since there might be a previous TRIM process
	* which has completed but the thread is not exited.
	*/
	if (cmd_type == POOL_TRIM_START &&
	(vd->vdev_trim_thread != NULL \|\| vd->vdev_top->vdev_removing)) {
	mutex_exit(&vd->vdev_trim_lock);
	return (SET_ERROR(EBUSY));
	} else if (cmd_type == POOL_TRIM_CANCEL &&
	(vd->vdev_trim_state != VDEV_TRIM_ACTIVE &&
	vd->vdev_trim_state != VDEV_TRIM_SUSPENDED)) {
	mutex_exit(&vd->vdev_trim_lock);
	return (SET_ERROR(ESRCH));
	} else if (cmd_type == POOL_TRIM_SUSPEND &&
	vd->vdev_trim_state != VDEV_TRIM_ACTIVE) {
	mutex_exit(&vd->vdev_trim_lock);
	return (SET_ERROR(ESRCH));
	}

	switch (cmd_type) {
	case POOL_TRIM_START:
	vdev_trim(vd, rate, partial, secure);
	break;
	case POOL_TRIM_CANCEL:
	vdev_trim_stop(vd, VDEV_TRIM_CANCELED, vd_list);
	break;
	case POOL_TRIM_SUSPEND:
	vdev_trim_stop(vd, VDEV_TRIM_SUSPENDED, vd_list);
	break;
	default:
	panic("invalid cmd_type %llu", (unsigned long long)cmd_type);
	}
	mutex_exit(&vd->vdev_trim_lock);

	return (0);
	}

	/*
	* Initiates a manual TRIM for the requested vdevs. This kicks off individual
	* TRIM threads for each child vdev. These threads pass over all of the free
	* space in the vdev's metaslabs and issues TRIM commands for that space.
	*/
	int
	spa_vdev_trim(spa_t spa, nvlist_t nv, uint64_t cmd_type, uint64_t rate,
	boolean_t partial, boolean_t secure, nvlist_t *vdev_errlist)
	{
	int total_errors = 0;
	list_t vd_list;

	list_create(&vd_list, sizeof (vdev_t),
	offsetof(vdev_t, vdev_trim_node));

	/*
	* We hold the namespace lock through the whole function
	* to prevent any changes to the pool while we're starting or
	* stopping TRIM. The config and state locks are held so that
	* we can properly assess the vdev state before we commit to
	* the TRIM operation.
	*/
	mutex_enter(&spa_namespace_lock);

	for (nvpair_t *pair = nvlist_next_nvpair(nv, NULL);
	pair != NULL; pair = nvlist_next_nvpair(nv, pair)) {
	uint64_t vdev_guid = fnvpair_value_uint64(pair);

	int error = spa_vdev_trim_impl(spa, vdev_guid, cmd_type,
	rate, partial, secure, &vd_list);
	if (error != 0) {
	char guid_as_str[MAXNAMELEN];

	(void) snprintf(guid_as_str, sizeof (guid_as_str),
	"%llu", (unsigned long long)vdev_guid);
	fnvlist_add_int64(vdev_errlist, guid_as_str, error);
	total_errors++;
	}
	}

	/* Wait for all TRIM threads to stop. */
	vdev_trim_stop_wait(spa, &vd_list);

	/* Sync out the TRIM state */
	txg_wait_synced(spa->spa_dsl_pool, 0);
	mutex_exit(&spa_namespace_lock);

	list_destroy(&vd_list);

	return (total_errors);
	}

	/*
	* Split a set of devices from their mirrors, and create a new pool from them.
	*/
	int
	spa_vdev_split_mirror(spa_t spa, char newname, nvlist_t *config,
	nvlist_t *props, boolean_t exp)
	{
	int error = 0;
	uint64_t txg, *glist;
	spa_t *newspa;
	uint_t c, children, lastlog;
	nvlist_t *child, nvl, *tmp;
	dmu_tx_t *tx;
	char *altroot = NULL;
	vdev_t rvd, vml = NULL; / vdev modify list */
	boolean_t activate_slog;

	ASSERT(spa_writeable(spa));

	txg = spa_vdev_enter(spa);

	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) {
	error = (spa_has_checkpoint(spa)) ?
	ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT;
	return (spa_vdev_exit(spa, NULL, txg, error));
	}

	/* clear the log and flush everything up to now */
	activate_slog = spa_passivate_log(spa);
	(void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG);
	error = spa_reset_logs(spa);
	txg = spa_vdev_config_enter(spa);

	if (activate_slog)
	spa_activate_log(spa);

	if (error != 0)
	return (spa_vdev_exit(spa, NULL, txg, error));

	/* check new spa name before going any further */
	if (spa_lookup(newname) != NULL)
	return (spa_vdev_exit(spa, NULL, txg, EEXIST));

	/*
	* scan through all the children to ensure they're all mirrors
	*/
	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 \|\|
	nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child,
	&children) != 0)
	return (spa_vdev_exit(spa, NULL, txg, EINVAL));

	/* first, check to ensure we've got the right child count */
	rvd = spa->spa_root_vdev;
	lastlog = 0;
	for (c = 0; c < rvd->vdev_children; c++) {
	vdev_t *vd = rvd->vdev_child[c];

	/* don't count the holes & logs as children */
	if (vd->vdev_islog \|\| (vd->vdev_ops != &vdev_indirect_ops &&
	!vdev_is_concrete(vd))) {
	if (lastlog == 0)
	lastlog = c;
	continue;
	}

	lastlog = 0;
	}
	if (children != (lastlog != 0 ? lastlog : rvd->vdev_children))
	return (spa_vdev_exit(spa, NULL, txg, EINVAL));

	/* next, ensure no spare or cache devices are part of the split */
	if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 \|\|
	nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0)
	return (spa_vdev_exit(spa, NULL, txg, EINVAL));

	vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP);
	glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP);

	/* then, loop over each vdev and validate it */
	for (c = 0; c < children; c++) {
	uint64_t is_hole = 0;

	(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE,
	&is_hole);

	if (is_hole != 0) {
	if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole \|\|
	spa->spa_root_vdev->vdev_child[c]->vdev_islog) {
	continue;
	} else {
	error = SET_ERROR(EINVAL);
	break;
	}
	}

	/* deal with indirect vdevs */
	if (spa->spa_root_vdev->vdev_child[c]->vdev_ops ==
	&vdev_indirect_ops)
	continue;

	/* which disk is going to be split? */
	if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID,
	&glist[c]) != 0) {
	error = SET_ERROR(EINVAL);
	break;
	}

	/* look it up in the spa */
	vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE);
	if (vml[c] == NULL) {
	error = SET_ERROR(ENODEV);
	break;
	}

	/* make sure there's nothing stopping the split */
	if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops \|\|
	vml[c]->vdev_islog \|\|
	!vdev_is_concrete(vml[c]) \|\|
	vml[c]->vdev_isspare \|\|
	vml[c]->vdev_isl2cache \|\|
	!vdev_writeable(vml[c]) \|\|
	vml[c]->vdev_children != 0 \|\|
	vml[c]->vdev_state != VDEV_STATE_HEALTHY \|\|
	c != spa->spa_root_vdev->vdev_child[c]->vdev_id) {
	error = SET_ERROR(EINVAL);
	break;
	}

	if (vdev_dtl_required(vml[c]) \|\|
	vdev_resilver_needed(vml[c], NULL, NULL)) {
	error = SET_ERROR(EBUSY);
	break;
	}

	/* we need certain info from the top level */
	VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY,
	vml[c]->vdev_top->vdev_ms_array) == 0);
	VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT,
	vml[c]->vdev_top->vdev_ms_shift) == 0);
	VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE,
	vml[c]->vdev_top->vdev_asize) == 0);
	VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT,
	vml[c]->vdev_top->vdev_ashift) == 0);

	/* transfer per-vdev ZAPs */
	ASSERT3U(vml[c]->vdev_leaf_zap, !=, 0);
	VERIFY0(nvlist_add_uint64(child[c],
	ZPOOL_CONFIG_VDEV_LEAF_ZAP, vml[c]->vdev_leaf_zap));

	ASSERT3U(vml[c]->vdev_top->vdev_top_zap, !=, 0);
	VERIFY0(nvlist_add_uint64(child[c],
	ZPOOL_CONFIG_VDEV_TOP_ZAP,
	vml[c]->vdev_parent->vdev_top_zap));
	}

	if (error != 0) {
	kmem_free(vml, children * sizeof (vdev_t *));
	kmem_free(glist, children * sizeof (uint64_t));
	return (spa_vdev_exit(spa, NULL, txg, error));
	}

	/* stop writers from using the disks */
	for (c = 0; c < children; c++) {
	if (vml[c] != NULL)
	vml[c]->vdev_offline = B_TRUE;
	}
	vdev_reopen(spa->spa_root_vdev);

	/*
	* Temporarily record the splitting vdevs in the spa config. This
	* will disappear once the config is regenerated.
	*/
	VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0);
	VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST,
	glist, children) == 0);
	kmem_free(glist, children * sizeof (uint64_t));

	mutex_enter(&spa->spa_props_lock);
	VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT,
	nvl) == 0);
	mutex_exit(&spa->spa_props_lock);
	spa->spa_config_splitting = nvl;
	vdev_config_dirty(spa->spa_root_vdev);

	/* configure and create the new pool */
	VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
	exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION,
	spa_version(spa)) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG,
	spa->spa_config_txg) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	spa_generate_guid(NULL)) == 0);
	VERIFY0(nvlist_add_boolean(config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS));
	(void) nvlist_lookup_string(props,
	zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);

	/* add the new pool to the namespace */
	newspa = spa_add(newname, config, altroot);
	newspa->spa_avz_action = AVZ_ACTION_REBUILD;
	newspa->spa_config_txg = spa->spa_config_txg;
	spa_set_log_state(newspa, SPA_LOG_CLEAR);

	/* release the spa config lock, retaining the namespace lock */
	spa_vdev_config_exit(spa, NULL, txg, 0, FTAG);

	if (zio_injection_enabled)
	zio_handle_panic_injection(spa, FTAG, 1);

	spa_activate(newspa, spa_mode_global);
	spa_async_suspend(newspa);

	/*
	* Temporarily stop the initializing and TRIM activity. We set the
	* state to ACTIVE so that we know to resume initializing or TRIM
	* once the split has completed.
	*/
	list_t vd_initialize_list;
	list_create(&vd_initialize_list, sizeof (vdev_t),
	offsetof(vdev_t, vdev_initialize_node));

	list_t vd_trim_list;
	list_create(&vd_trim_list, sizeof (vdev_t),
	offsetof(vdev_t, vdev_trim_node));

	for (c = 0; c < children; c++) {
	if (vml[c] != NULL && vml[c]->vdev_ops != &vdev_indirect_ops) {
	mutex_enter(&vml[c]->vdev_initialize_lock);
	vdev_initialize_stop(vml[c],
	VDEV_INITIALIZE_ACTIVE, &vd_initialize_list);
	mutex_exit(&vml[c]->vdev_initialize_lock);

	mutex_enter(&vml[c]->vdev_trim_lock);
	vdev_trim_stop(vml[c], VDEV_TRIM_ACTIVE, &vd_trim_list);
	mutex_exit(&vml[c]->vdev_trim_lock);
	}
	}

	vdev_initialize_stop_wait(spa, &vd_initialize_list);
	vdev_trim_stop_wait(spa, &vd_trim_list);

	list_destroy(&vd_initialize_list);
	list_destroy(&vd_trim_list);

	newspa->spa_config_source = SPA_CONFIG_SRC_SPLIT;
	newspa->spa_is_splitting = B_TRUE;

	/* create the new pool from the disks of the original pool */
	error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE);
	if (error)
	goto out;

	/* if that worked, generate a real config for the new pool */
	if (newspa->spa_root_vdev != NULL) {
	VERIFY(nvlist_alloc(&newspa->spa_config_splitting,
	NV_UNIQUE_NAME, KM_SLEEP) == 0);
	VERIFY(nvlist_add_uint64(newspa->spa_config_splitting,
	ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0);
	spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL,
	B_TRUE));
	}

	/* set the props */
	if (props != NULL) {
	spa_configfile_set(newspa, props, B_FALSE);
	error = spa_prop_set(newspa, props);
	if (error)
	goto out;
	}

	/* flush everything */
	txg = spa_vdev_config_enter(newspa);
	vdev_config_dirty(newspa->spa_root_vdev);
	(void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG);

	if (zio_injection_enabled)
	zio_handle_panic_injection(spa, FTAG, 2);

	spa_async_resume(newspa);

	/* finally, update the original pool's config */
	txg = spa_vdev_config_enter(spa);
	tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error != 0)
	dmu_tx_abort(tx);
	for (c = 0; c < children; c++) {
	if (vml[c] != NULL && vml[c]->vdev_ops != &vdev_indirect_ops) {
	vdev_t *tvd = vml[c]->vdev_top;

	/*
	* Need to be sure the detachable VDEV is not
	* on any other txg's DTL list to prevent it
	* from being accessed after it's freed.
	*/
	for (int t = 0; t < TXG_SIZE; t++) {
	(void) txg_list_remove_this(
	&tvd->vdev_dtl_list, vml[c], t);
	}

	vdev_split(vml[c]);
	if (error == 0)
	spa_history_log_internal(spa, "detach", tx,
	"vdev=%s", vml[c]->vdev_path);

	vdev_free(vml[c]);
	}
	}
	spa->spa_avz_action = AVZ_ACTION_REBUILD;
	vdev_config_dirty(spa->spa_root_vdev);
	spa->spa_config_splitting = NULL;
	nvlist_free(nvl);
	if (error == 0)
	dmu_tx_commit(tx);
	(void) spa_vdev_exit(spa, NULL, txg, 0);

	if (zio_injection_enabled)
	zio_handle_panic_injection(spa, FTAG, 3);

	/* split is complete; log a history record */
	spa_history_log_internal(newspa, "split", NULL,
	"from pool %s", spa_name(spa));

	newspa->spa_is_splitting = B_FALSE;
	kmem_free(vml, children * sizeof (vdev_t *));

	/* if we're not going to mount the filesystems in userland, export */
	if (exp)
	error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL,
	B_FALSE, B_FALSE);

	return (error);

	out:
	spa_unload(newspa);
	spa_deactivate(newspa);
	spa_remove(newspa);

	txg = spa_vdev_config_enter(spa);

	/* re-online all offlined disks */
	for (c = 0; c < children; c++) {
	if (vml[c] != NULL)
	vml[c]->vdev_offline = B_FALSE;
	}

	/* restart initializing or trimming disks as necessary */
	spa_async_request(spa, SPA_ASYNC_INITIALIZE_RESTART);
	spa_async_request(spa, SPA_ASYNC_TRIM_RESTART);
	spa_async_request(spa, SPA_ASYNC_AUTOTRIM_RESTART);

	vdev_reopen(spa->spa_root_vdev);

	nvlist_free(spa->spa_config_splitting);
	spa->spa_config_splitting = NULL;
	(void) spa_vdev_exit(spa, NULL, txg, error);

	kmem_free(vml, children * sizeof (vdev_t *));
	return (error);
	}

	/*
	* Find any device that's done replacing, or a vdev marked 'unspare' that's
	* currently spared, so we can detach it.
	*/
	static vdev_t *
	spa_vdev_resilver_done_hunt(vdev_t *vd)
	{
	vdev_t newvd, oldvd;

	for (int c = 0; c < vd->vdev_children; c++) {
	oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]);
	if (oldvd != NULL)
	return (oldvd);
	}

	/*
	* Check for a completed replacement. We always consider the first
	* vdev in the list to be the oldest vdev, and the last one to be
	* the newest (see spa_vdev_attach() for how that works). In
	* the case where the newest vdev is faulted, we will not automatically
	* remove it after a resilver completes. This is OK as it will require
	* user intervention to determine which disk the admin wishes to keep.
	*/
	if (vd->vdev_ops == &vdev_replacing_ops) {
	ASSERT(vd->vdev_children > 1);

	newvd = vd->vdev_child[vd->vdev_children - 1];
	oldvd = vd->vdev_child[0];

	if (vdev_dtl_empty(newvd, DTL_MISSING) &&
	vdev_dtl_empty(newvd, DTL_OUTAGE) &&
	!vdev_dtl_required(oldvd))
	return (oldvd);
	}

	/*
	* Check for a completed resilver with the 'unspare' flag set.
	* Also potentially update faulted state.
	*/
	if (vd->vdev_ops == &vdev_spare_ops) {
	vdev_t *first = vd->vdev_child[0];
	vdev_t *last = vd->vdev_child[vd->vdev_children - 1];

	if (last->vdev_unspare) {
	oldvd = first;
	newvd = last;
	} else if (first->vdev_unspare) {
	oldvd = last;
	newvd = first;
	} else {
	oldvd = NULL;
	}

	if (oldvd != NULL &&
	vdev_dtl_empty(newvd, DTL_MISSING) &&
	vdev_dtl_empty(newvd, DTL_OUTAGE) &&
	!vdev_dtl_required(oldvd))
	return (oldvd);

	vdev_propagate_state(vd);

	/*
	* If there are more than two spares attached to a disk,
	* and those spares are not required, then we want to
	* attempt to free them up now so that they can be used
	* by other pools. Once we're back down to a single
	* disk+spare, we stop removing them.
	*/
	if (vd->vdev_children > 2) {
	newvd = vd->vdev_child[1];

	if (newvd->vdev_isspare && last->vdev_isspare &&
	vdev_dtl_empty(last, DTL_MISSING) &&
	vdev_dtl_empty(last, DTL_OUTAGE) &&
	!vdev_dtl_required(newvd))
	return (newvd);
	}
	}

	return (NULL);
	}

	static void
	spa_vdev_resilver_done(spa_t *spa)
	{
	vdev_t vd, pvd, *ppvd;
	uint64_t guid, sguid, pguid, ppguid;

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);

	while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) {
	pvd = vd->vdev_parent;
	ppvd = pvd->vdev_parent;
	guid = vd->vdev_guid;
	pguid = pvd->vdev_guid;
	ppguid = ppvd->vdev_guid;
	sguid = 0;
	/*
	* If we have just finished replacing a hot spared device, then
	* we need to detach the parent's first child (the original hot
	* spare) as well.
	*/
	if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 &&
	ppvd->vdev_children == 2) {
	ASSERT(pvd->vdev_ops == &vdev_replacing_ops);
	sguid = ppvd->vdev_child[1]->vdev_guid;
	}
	ASSERT(vd->vdev_resilver_txg == 0 \|\| !vdev_dtl_required(vd));

	spa_config_exit(spa, SCL_ALL, FTAG);
	if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0)
	return;
	if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0)
	return;
	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	}

	spa_config_exit(spa, SCL_ALL, FTAG);

	/*
	* If a detach was not performed above replace waiters will not have
	* been notified. In which case we must do so now.
	*/
	spa_notify_waiters(spa);
	}

	/*
	* Update the stored path or FRU for this vdev.
	*/
	static int
	spa_vdev_set_common(spa_t spa, uint64_t guid, const char value,
	boolean_t ispath)
	{
	vdev_t *vd;
	boolean_t sync = B_FALSE;

	ASSERT(spa_writeable(spa));

	spa_vdev_state_enter(spa, SCL_ALL);

	if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
	return (spa_vdev_state_exit(spa, NULL, ENOENT));

	if (!vd->vdev_ops->vdev_op_leaf)
	return (spa_vdev_state_exit(spa, NULL, ENOTSUP));

	if (ispath) {
	if (strcmp(value, vd->vdev_path) != 0) {
	spa_strfree(vd->vdev_path);
	vd->vdev_path = spa_strdup(value);
	sync = B_TRUE;
	}
	} else {
	if (vd->vdev_fru == NULL) {
	vd->vdev_fru = spa_strdup(value);
	sync = B_TRUE;
	} else if (strcmp(value, vd->vdev_fru) != 0) {
	spa_strfree(vd->vdev_fru);
	vd->vdev_fru = spa_strdup(value);
	sync = B_TRUE;
	}
	}

	return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0));
	}

	int
	spa_vdev_setpath(spa_t spa, uint64_t guid, const char newpath)
	{
	return (spa_vdev_set_common(spa, guid, newpath, B_TRUE));
	}

	int
	spa_vdev_setfru(spa_t spa, uint64_t guid, const char newfru)
	{
	return (spa_vdev_set_common(spa, guid, newfru, B_FALSE));
	}

	/*
	* ==========================================================================
	* SPA Scanning
	* ==========================================================================
	*/
	int
	spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t cmd)
	{
	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);

	if (dsl_scan_resilvering(spa->spa_dsl_pool))
	return (SET_ERROR(EBUSY));

	return (dsl_scrub_set_pause_resume(spa->spa_dsl_pool, cmd));
	}

	int
	spa_scan_stop(spa_t *spa)
	{
	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);
	if (dsl_scan_resilvering(spa->spa_dsl_pool))
	return (SET_ERROR(EBUSY));
	return (dsl_scan_cancel(spa->spa_dsl_pool));
	}

	int
	spa_scan(spa_t *spa, pool_scan_func_t func)
	{
	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0);

	if (func >= POOL_SCAN_FUNCS \|\| func == POOL_SCAN_NONE)
	return (SET_ERROR(ENOTSUP));

	if (func == POOL_SCAN_RESILVER &&
	!spa_feature_is_enabled(spa, SPA_FEATURE_RESILVER_DEFER))
	return (SET_ERROR(ENOTSUP));

	/*
	* If a resilver was requested, but there is no DTL on a
	* writeable leaf device, we have nothing to do.
	*/
	if (func == POOL_SCAN_RESILVER &&
	!vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) {
	spa_async_request(spa, SPA_ASYNC_RESILVER_DONE);
	return (0);
	}

	return (dsl_scan(spa->spa_dsl_pool, func));
	}

	/*
	* ==========================================================================
	* SPA async task processing
	* ==========================================================================
	*/

	static void
	spa_async_remove(spa_t spa, vdev_t vd)
	{
	if (vd->vdev_remove_wanted) {
	vd->vdev_remove_wanted = B_FALSE;
	vd->vdev_delayed_close = B_FALSE;
	vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE);

	/*
	* We want to clear the stats, but we don't want to do a full
	* vdev_clear() as that will cause us to throw away
	* degraded/faulted state as well as attempt to reopen the
	* device, all of which is a waste.
	*/
	vd->vdev_stat.vs_read_errors = 0;
	vd->vdev_stat.vs_write_errors = 0;
	vd->vdev_stat.vs_checksum_errors = 0;

	vdev_state_dirty(vd->vdev_top);

	/* Tell userspace that the vdev is gone. */
	zfs_post_remove(spa, vd);
	}

	for (int c = 0; c < vd->vdev_children; c++)
	spa_async_remove(spa, vd->vdev_child[c]);
	}

	static void
	spa_async_probe(spa_t spa, vdev_t vd)
	{
	if (vd->vdev_probe_wanted) {
	vd->vdev_probe_wanted = B_FALSE;
	vdev_reopen(vd); /* vdev_open() does the actual probe */
	}

	for (int c = 0; c < vd->vdev_children; c++)
	spa_async_probe(spa, vd->vdev_child[c]);
	}

	static void
	spa_async_autoexpand(spa_t spa, vdev_t vd)
	{
	if (!spa->spa_autoexpand)
	return;

	for (int c = 0; c < vd->vdev_children; c++) {
	vdev_t *cvd = vd->vdev_child[c];
	spa_async_autoexpand(spa, cvd);
	}

	if (!vd->vdev_ops->vdev_op_leaf \|\| vd->vdev_physpath == NULL)
	return;

	spa_event_notify(vd->vdev_spa, vd, NULL, ESC_ZFS_VDEV_AUTOEXPAND);
	}

	static void
	spa_async_thread(void *arg)
	{
	spa_t spa = (spa_t )arg;
	dsl_pool_t *dp = spa->spa_dsl_pool;
	int tasks;

	ASSERT(spa->spa_sync_on);

	mutex_enter(&spa->spa_async_lock);
	tasks = spa->spa_async_tasks;
	spa->spa_async_tasks = 0;
	mutex_exit(&spa->spa_async_lock);

	/*
	* See if the config needs to be updated.
	*/
	if (tasks & SPA_ASYNC_CONFIG_UPDATE) {
	uint64_t old_space, new_space;

	mutex_enter(&spa_namespace_lock);
	old_space = metaslab_class_get_space(spa_normal_class(spa));
	old_space += metaslab_class_get_space(spa_special_class(spa));
	old_space += metaslab_class_get_space(spa_dedup_class(spa));
	old_space += metaslab_class_get_space(
	spa_embedded_log_class(spa));

	spa_config_update(spa, SPA_CONFIG_UPDATE_POOL);

	new_space = metaslab_class_get_space(spa_normal_class(spa));
	new_space += metaslab_class_get_space(spa_special_class(spa));
	new_space += metaslab_class_get_space(spa_dedup_class(spa));
	new_space += metaslab_class_get_space(
	spa_embedded_log_class(spa));
	mutex_exit(&spa_namespace_lock);

	/*
	* If the pool grew as a result of the config update,
	* then log an internal history event.
	*/
	if (new_space != old_space) {
	spa_history_log_internal(spa, "vdev online", NULL,
	"pool '%s' size: %llu(+%llu)",
	spa_name(spa), (u_longlong_t)new_space,
	(u_longlong_t)(new_space - old_space));
	}
	}

	/*
	* See if any devices need to be marked REMOVED.
	*/
	if (tasks & SPA_ASYNC_REMOVE) {
	spa_vdev_state_enter(spa, SCL_NONE);
	spa_async_remove(spa, spa->spa_root_vdev);
	for (int i = 0; i < spa->spa_l2cache.sav_count; i++)
	spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]);
	for (int i = 0; i < spa->spa_spares.sav_count; i++)
	spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]);
	(void) spa_vdev_state_exit(spa, NULL, 0);
	}

	if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) {
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	spa_async_autoexpand(spa, spa->spa_root_vdev);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	}

	/*
	* See if any devices need to be probed.
	*/
	if (tasks & SPA_ASYNC_PROBE) {
	spa_vdev_state_enter(spa, SCL_NONE);
	spa_async_probe(spa, spa->spa_root_vdev);
	(void) spa_vdev_state_exit(spa, NULL, 0);
	}

	/*
	* If any devices are done replacing, detach them.
	*/
	if (tasks & SPA_ASYNC_RESILVER_DONE \|\|
	tasks & SPA_ASYNC_REBUILD_DONE) {
	spa_vdev_resilver_done(spa);
	}

	/*
	* Kick off a resilver.
	*/
	if (tasks & SPA_ASYNC_RESILVER &&
	!vdev_rebuild_active(spa->spa_root_vdev) &&
	(!dsl_scan_resilvering(dp) \|\|
	!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_RESILVER_DEFER)))
	dsl_scan_restart_resilver(dp, 0);

	if (tasks & SPA_ASYNC_INITIALIZE_RESTART) {
	mutex_enter(&spa_namespace_lock);
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	vdev_initialize_restart(spa->spa_root_vdev);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	mutex_exit(&spa_namespace_lock);
	}

	if (tasks & SPA_ASYNC_TRIM_RESTART) {
	mutex_enter(&spa_namespace_lock);
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	vdev_trim_restart(spa->spa_root_vdev);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	mutex_exit(&spa_namespace_lock);
	}

	if (tasks & SPA_ASYNC_AUTOTRIM_RESTART) {
	mutex_enter(&spa_namespace_lock);
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	vdev_autotrim_restart(spa);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	mutex_exit(&spa_namespace_lock);
	}

	/*
	* Kick off L2 cache whole device TRIM.
	*/
	if (tasks & SPA_ASYNC_L2CACHE_TRIM) {
	mutex_enter(&spa_namespace_lock);
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
	vdev_trim_l2arc(spa);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	mutex_exit(&spa_namespace_lock);
	}

	/*
	* Kick off L2 cache rebuilding.
	*/
	if (tasks & SPA_ASYNC_L2CACHE_REBUILD) {
	mutex_enter(&spa_namespace_lock);
	spa_config_enter(spa, SCL_L2ARC, FTAG, RW_READER);
	l2arc_spa_rebuild_start(spa);
	spa_config_exit(spa, SCL_L2ARC, FTAG);
	mutex_exit(&spa_namespace_lock);
	}

	/*
	* Let the world know that we're done.
	*/
	mutex_enter(&spa->spa_async_lock);
	spa->spa_async_thread = NULL;
	cv_broadcast(&spa->spa_async_cv);
	mutex_exit(&spa->spa_async_lock);
	thread_exit();
	}

	void
	spa_async_suspend(spa_t *spa)
	{
	mutex_enter(&spa->spa_async_lock);
	spa->spa_async_suspended++;
	while (spa->spa_async_thread != NULL)
	cv_wait(&spa->spa_async_cv, &spa->spa_async_lock);
	mutex_exit(&spa->spa_async_lock);

	spa_vdev_remove_suspend(spa);

	zthr_t *condense_thread = spa->spa_condense_zthr;
	if (condense_thread != NULL)
	zthr_cancel(condense_thread);

	zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr;
	if (discard_thread != NULL)
	zthr_cancel(discard_thread);

	zthr_t *ll_delete_thread = spa->spa_livelist_delete_zthr;
	if (ll_delete_thread != NULL)
	zthr_cancel(ll_delete_thread);

	zthr_t *ll_condense_thread = spa->spa_livelist_condense_zthr;
	if (ll_condense_thread != NULL)
	zthr_cancel(ll_condense_thread);
	}

	void
	spa_async_resume(spa_t *spa)
	{
	mutex_enter(&spa->spa_async_lock);
	ASSERT(spa->spa_async_suspended != 0);
	spa->spa_async_suspended--;
	mutex_exit(&spa->spa_async_lock);
	spa_restart_removal(spa);

	zthr_t *condense_thread = spa->spa_condense_zthr;
	if (condense_thread != NULL)
	zthr_resume(condense_thread);

	zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr;
	if (discard_thread != NULL)
	zthr_resume(discard_thread);

	zthr_t *ll_delete_thread = spa->spa_livelist_delete_zthr;
	if (ll_delete_thread != NULL)
	zthr_resume(ll_delete_thread);

	zthr_t *ll_condense_thread = spa->spa_livelist_condense_zthr;
	if (ll_condense_thread != NULL)
	zthr_resume(ll_condense_thread);
	}

	static boolean_t
	spa_async_tasks_pending(spa_t *spa)
	{
	uint_t non_config_tasks;
	uint_t config_task;
	boolean_t config_task_suspended;

	non_config_tasks = spa->spa_async_tasks & ~SPA_ASYNC_CONFIG_UPDATE;
	config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE;
	if (spa->spa_ccw_fail_time == 0) {
	config_task_suspended = B_FALSE;
	} else {
	config_task_suspended =
	(gethrtime() - spa->spa_ccw_fail_time) <
	((hrtime_t)zfs_ccw_retry_interval * NANOSEC);
	}

	return (non_config_tasks \|\| (config_task && !config_task_suspended));
	}

	static void
	spa_async_dispatch(spa_t *spa)
	{
	mutex_enter(&spa->spa_async_lock);
	if (spa_async_tasks_pending(spa) &&
	!spa->spa_async_suspended &&
	spa->spa_async_thread == NULL)
	spa->spa_async_thread = thread_create(NULL, 0,
	spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri);
	mutex_exit(&spa->spa_async_lock);
	}

	void
	spa_async_request(spa_t *spa, int task)
	{
	zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task);
	mutex_enter(&spa->spa_async_lock);
	spa->spa_async_tasks \|= task;
	mutex_exit(&spa->spa_async_lock);
	}

	int
	spa_async_tasks(spa_t *spa)
	{
	return (spa->spa_async_tasks);
	}

	/*
	* ==========================================================================
	* SPA syncing routines
	* ==========================================================================
	*/


	static int
	bpobj_enqueue_cb(void arg, const blkptr_t bp, boolean_t bp_freed,
	dmu_tx_t *tx)
	{
	bpobj_t *bpo = arg;
	bpobj_enqueue(bpo, bp, bp_freed, tx);
	return (0);
	}

	int
	bpobj_enqueue_alloc_cb(void arg, const blkptr_t bp, dmu_tx_t *tx)
	{
	return (bpobj_enqueue_cb(arg, bp, B_FALSE, tx));
	}

	int
	bpobj_enqueue_free_cb(void arg, const blkptr_t bp, dmu_tx_t *tx)
	{
	return (bpobj_enqueue_cb(arg, bp, B_TRUE, tx));
	}

	static int
	spa_free_sync_cb(void arg, const blkptr_t bp, dmu_tx_t *tx)
	{
	zio_t *pio = arg;

	zio_nowait(zio_free_sync(pio, pio->io_spa, dmu_tx_get_txg(tx), bp,
	pio->io_flags));
	return (0);
	}

	static int
	bpobj_spa_free_sync_cb(void arg, const blkptr_t bp, boolean_t bp_freed,
	dmu_tx_t *tx)
	{
	ASSERT(!bp_freed);
	return (spa_free_sync_cb(arg, bp, tx));
	}

	/*
	* Note: this simple function is not inlined to make it easier to dtrace the
	* amount of time spent syncing frees.
	*/
	static void
	spa_sync_frees(spa_t spa, bplist_t bpl, dmu_tx_t *tx)
	{
	zio_t *zio = zio_root(spa, NULL, NULL, 0);
	bplist_iterate(bpl, spa_free_sync_cb, zio, tx);
	VERIFY(zio_wait(zio) == 0);
	}

	/*
	* Note: this simple function is not inlined to make it easier to dtrace the
	* amount of time spent syncing deferred frees.
	*/
	static void
	spa_sync_deferred_frees(spa_t spa, dmu_tx_t tx)
	{
	if (spa_sync_pass(spa) != 1)
	return;

	/*
	* Note:
	* If the log space map feature is active, we stop deferring
	* frees to the next TXG and therefore running this function
	* would be considered a no-op as spa_deferred_bpobj should
	* not have any entries.
	*
	* That said we run this function anyway (instead of returning
	* immediately) for the edge-case scenario where we just
	* activated the log space map feature in this TXG but we have
	* deferred frees from the previous TXG.
	*/
	zio_t *zio = zio_root(spa, NULL, NULL, 0);
	VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj,
	bpobj_spa_free_sync_cb, zio, tx), ==, 0);
	VERIFY0(zio_wait(zio));
	}

	static void
	spa_sync_nvlist(spa_t spa, uint64_t obj, nvlist_t nv, dmu_tx_t *tx)
	{
	char *packed = NULL;
	size_t bufsize;
	size_t nvsize = 0;
	dmu_buf_t *db;

	VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0);

	/*
	* Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration
	* information. This avoids the dmu_buf_will_dirty() path and
	* saves us a pre-read to get data we don't actually care about.
	*/
	bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE);
	packed = vmem_alloc(bufsize, KM_SLEEP);

	VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR,
	KM_SLEEP) == 0);
	bzero(packed + nvsize, bufsize - nvsize);

	dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx);

	vmem_free(packed, bufsize);

	VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db));
	dmu_buf_will_dirty(db, tx);
	(uint64_t )db->db_data = nvsize;
	dmu_buf_rele(db, FTAG);
	}

	static void
	spa_sync_aux_dev(spa_t spa, spa_aux_vdev_t sav, dmu_tx_t *tx,
	const char config, const char entry)
	{
	nvlist_t *nvroot;
	nvlist_t **list;
	int i;

	if (!sav->sav_sync)
	return;

	/*
	* Update the MOS nvlist describing the list of available devices.
	* spa_validate_aux() will have already made sure this nvlist is
	* valid and the vdevs are labeled appropriately.
	*/
	if (sav->sav_object == 0) {
	sav->sav_object = dmu_object_alloc(spa->spa_meta_objset,
	DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE,
	sizeof (uint64_t), tx);
	VERIFY(zap_update(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1,
	&sav->sav_object, tx) == 0);
	}

	VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0);
	if (sav->sav_count == 0) {
	VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0);
	} else {
	list = kmem_alloc(sav->sav_countsizeof (void ), KM_SLEEP);
	for (i = 0; i < sav->sav_count; i++)
	list[i] = vdev_config_generate(spa, sav->sav_vdevs[i],
	B_FALSE, VDEV_CONFIG_L2CACHE);
	VERIFY(nvlist_add_nvlist_array(nvroot, config, list,
	sav->sav_count) == 0);
	for (i = 0; i < sav->sav_count; i++)
	nvlist_free(list[i]);
	kmem_free(list, sav->sav_count * sizeof (void *));
	}

	spa_sync_nvlist(spa, sav->sav_object, nvroot, tx);
	nvlist_free(nvroot);

	sav->sav_sync = B_FALSE;
	}

	/*
	* Rebuild spa's all-vdev ZAP from the vdev ZAPs indicated in each vdev_t.
	* The all-vdev ZAP must be empty.
	*/
	static void
	spa_avz_build(vdev_t vd, uint64_t avz, dmu_tx_t tx)
	{
	spa_t *spa = vd->vdev_spa;

	if (vd->vdev_top_zap != 0) {
	VERIFY0(zap_add_int(spa->spa_meta_objset, avz,
	vd->vdev_top_zap, tx));
	}
	if (vd->vdev_leaf_zap != 0) {
	VERIFY0(zap_add_int(spa->spa_meta_objset, avz,
	vd->vdev_leaf_zap, tx));
	}
	for (uint64_t i = 0; i < vd->vdev_children; i++) {
	spa_avz_build(vd->vdev_child[i], avz, tx);
	}
	}

	static void
	spa_sync_config_object(spa_t spa, dmu_tx_t tx)
	{
	nvlist_t *config;

	/*
	* If the pool is being imported from a pre-per-vdev-ZAP version of ZFS,
	* its config may not be dirty but we still need to build per-vdev ZAPs.
	* Similarly, if the pool is being assembled (e.g. after a split), we
	* need to rebuild the AVZ although the config may not be dirty.
	*/
	if (list_is_empty(&spa->spa_config_dirty_list) &&
	spa->spa_avz_action == AVZ_ACTION_NONE)
	return;

	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);

	ASSERT(spa->spa_avz_action == AVZ_ACTION_NONE \|\|
	spa->spa_avz_action == AVZ_ACTION_INITIALIZE \|\|
	spa->spa_all_vdev_zaps != 0);

	if (spa->spa_avz_action == AVZ_ACTION_REBUILD) {
	/* Make and build the new AVZ */
	uint64_t new_avz = zap_create(spa->spa_meta_objset,
	DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx);
	spa_avz_build(spa->spa_root_vdev, new_avz, tx);

	/* Diff old AVZ with new one */
	zap_cursor_t zc;
	zap_attribute_t za;

	for (zap_cursor_init(&zc, spa->spa_meta_objset,
	spa->spa_all_vdev_zaps);
	zap_cursor_retrieve(&zc, &za) == 0;
	zap_cursor_advance(&zc)) {
	uint64_t vdzap = za.za_first_integer;
	if (zap_lookup_int(spa->spa_meta_objset, new_avz,
	vdzap) == ENOENT) {
	/*
	* ZAP is listed in old AVZ but not in new one;
	* destroy it
	*/
	VERIFY0(zap_destroy(spa->spa_meta_objset, vdzap,
	tx));
	}
	}

	zap_cursor_fini(&zc);

	/* Destroy the old AVZ */
	VERIFY0(zap_destroy(spa->spa_meta_objset,
	spa->spa_all_vdev_zaps, tx));

	/* Replace the old AVZ in the dir obj with the new one */
	VERIFY0(zap_update(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP,
	sizeof (new_avz), 1, &new_avz, tx));

	spa->spa_all_vdev_zaps = new_avz;
	} else if (spa->spa_avz_action == AVZ_ACTION_DESTROY) {
	zap_cursor_t zc;
	zap_attribute_t za;

	/* Walk through the AVZ and destroy all listed ZAPs */
	for (zap_cursor_init(&zc, spa->spa_meta_objset,
	spa->spa_all_vdev_zaps);
	zap_cursor_retrieve(&zc, &za) == 0;
	zap_cursor_advance(&zc)) {
	uint64_t zap = za.za_first_integer;
	VERIFY0(zap_destroy(spa->spa_meta_objset, zap, tx));
	}

	zap_cursor_fini(&zc);

	/* Destroy and unlink the AVZ itself */
	VERIFY0(zap_destroy(spa->spa_meta_objset,
	spa->spa_all_vdev_zaps, tx));
	VERIFY0(zap_remove(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, tx));
	spa->spa_all_vdev_zaps = 0;
	}

	if (spa->spa_all_vdev_zaps == 0) {
	spa->spa_all_vdev_zaps = zap_create_link(spa->spa_meta_objset,
	DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_VDEV_ZAP_MAP, tx);
	}
	spa->spa_avz_action = AVZ_ACTION_NONE;

	/* Create ZAPs for vdevs that don't have them. */
	vdev_construct_zaps(spa->spa_root_vdev, tx);

	config = spa_config_generate(spa, spa->spa_root_vdev,
	dmu_tx_get_txg(tx), B_FALSE);

	/*
	* If we're upgrading the spa version then make sure that
	* the config object gets updated with the correct version.
	*/
	if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version)
	fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION,
	spa->spa_uberblock.ub_version);

	spa_config_exit(spa, SCL_STATE, FTAG);

	nvlist_free(spa->spa_config_syncing);
	spa->spa_config_syncing = config;

	spa_sync_nvlist(spa, spa->spa_config_object, config, tx);
	}

	static void
	spa_sync_version(void arg, dmu_tx_t tx)
	{
	uint64_t *versionp = arg;
	uint64_t version = *versionp;
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;

	/*
	* Setting the version is special cased when first creating the pool.
	*/
	ASSERT(tx->tx_txg != TXG_INITIAL);

	ASSERT(SPA_VERSION_IS_SUPPORTED(version));
	ASSERT(version >= spa_version(spa));

	spa->spa_uberblock.ub_version = version;
	vdev_config_dirty(spa->spa_root_vdev);
	spa_history_log_internal(spa, "set", tx, "version=%lld",
	(longlong_t)version);
	}

	/*
	* Set zpool properties.
	*/
	static void
	spa_sync_props(void arg, dmu_tx_t tx)
	{
	nvlist_t *nvp = arg;
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	objset_t *mos = spa->spa_meta_objset;
	nvpair_t *elem = NULL;

	mutex_enter(&spa->spa_props_lock);

	while ((elem = nvlist_next_nvpair(nvp, elem))) {
	uint64_t intval;
	char strval, fname;
	zpool_prop_t prop;
	const char *propname;
	zprop_type_t proptype;
	spa_feature_t fid;

	switch (prop = zpool_name_to_prop(nvpair_name(elem))) {
	case ZPOOL_PROP_INVAL:
	/*
	* We checked this earlier in spa_prop_validate().
	*/
	ASSERT(zpool_prop_feature(nvpair_name(elem)));

	fname = strchr(nvpair_name(elem), '@') + 1;
	VERIFY0(zfeature_lookup_name(fname, &fid));

	spa_feature_enable(spa, fid, tx);
	spa_history_log_internal(spa, "set", tx,
	"%s=enabled", nvpair_name(elem));
	break;

	case ZPOOL_PROP_VERSION:
	intval = fnvpair_value_uint64(elem);
	/*
	* The version is synced separately before other
	* properties and should be correct by now.
	*/
	ASSERT3U(spa_version(spa), >=, intval);
	break;

	case ZPOOL_PROP_ALTROOT:
	/*
	* 'altroot' is a non-persistent property. It should
	* have been set temporarily at creation or import time.
	*/
	ASSERT(spa->spa_root != NULL);
	break;

	case ZPOOL_PROP_READONLY:
	case ZPOOL_PROP_CACHEFILE:
	/*
	* 'readonly' and 'cachefile' are also non-persistent
	* properties.
	*/
	break;
	case ZPOOL_PROP_COMMENT:
	strval = fnvpair_value_string(elem);
	if (spa->spa_comment != NULL)
	spa_strfree(spa->spa_comment);
	spa->spa_comment = spa_strdup(strval);
	/*
	* We need to dirty the configuration on all the vdevs
	* so that their labels get updated. We also need to
	* update the cache file to keep it in sync with the
	* MOS version. It's unnecessary to do this for pool
	* creation since the vdev's configuration has already
	* been dirtied.
	*/
	if (tx->tx_txg != TXG_INITIAL) {
	vdev_config_dirty(spa->spa_root_vdev);
	spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
	}
	spa_history_log_internal(spa, "set", tx,
	"%s=%s", nvpair_name(elem), strval);
	break;
	case ZPOOL_PROP_COMPATIBILITY:
	strval = fnvpair_value_string(elem);
	if (spa->spa_compatibility != NULL)
	spa_strfree(spa->spa_compatibility);
	spa->spa_compatibility = spa_strdup(strval);
	/*
	* Dirty the configuration on vdevs as above.
	*/
	if (tx->tx_txg != TXG_INITIAL) {
	vdev_config_dirty(spa->spa_root_vdev);
	spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
	}

	spa_history_log_internal(spa, "set", tx,
	"%s=%s", nvpair_name(elem), strval);
	break;

	default:
	/*
	* Set pool property values in the poolprops mos object.
	*/
	if (spa->spa_pool_props_object == 0) {
	spa->spa_pool_props_object =
	zap_create_link(mos, DMU_OT_POOL_PROPS,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS,
	tx);
	}

	/* normalize the property name */
	propname = zpool_prop_to_name(prop);
	proptype = zpool_prop_get_type(prop);

	if (nvpair_type(elem) == DATA_TYPE_STRING) {
	ASSERT(proptype == PROP_TYPE_STRING);
	strval = fnvpair_value_string(elem);
	VERIFY0(zap_update(mos,
	spa->spa_pool_props_object, propname,
	1, strlen(strval) + 1, strval, tx));
	spa_history_log_internal(spa, "set", tx,
	"%s=%s", nvpair_name(elem), strval);
	} else if (nvpair_type(elem) == DATA_TYPE_UINT64) {
	intval = fnvpair_value_uint64(elem);

	if (proptype == PROP_TYPE_INDEX) {
	const char *unused;
	VERIFY0(zpool_prop_index_to_string(
	prop, intval, &unused));
	}
	VERIFY0(zap_update(mos,
	spa->spa_pool_props_object, propname,
	8, 1, &intval, tx));
	spa_history_log_internal(spa, "set", tx,
	"%s=%lld", nvpair_name(elem),
	(longlong_t)intval);
	} else {
	ASSERT(0); /* not allowed */
	}

	switch (prop) {
	case ZPOOL_PROP_DELEGATION:
	spa->spa_delegation = intval;
	break;
	case ZPOOL_PROP_BOOTFS:
	spa->spa_bootfs = intval;
	break;
	case ZPOOL_PROP_FAILUREMODE:
	spa->spa_failmode = intval;
	break;
	case ZPOOL_PROP_AUTOTRIM:
	spa->spa_autotrim = intval;
	spa_async_request(spa,
	SPA_ASYNC_AUTOTRIM_RESTART);
	break;
	case ZPOOL_PROP_AUTOEXPAND:
	spa->spa_autoexpand = intval;
	if (tx->tx_txg != TXG_INITIAL)
	spa_async_request(spa,
	SPA_ASYNC_AUTOEXPAND);
	break;
	case ZPOOL_PROP_MULTIHOST:
	spa->spa_multihost = intval;
	break;
	default:
	break;
	}
	}

	}

	mutex_exit(&spa->spa_props_lock);
	}

	/*
	* Perform one-time upgrade on-disk changes. spa_version() does not
	* reflect the new version this txg, so there must be no changes this
	* txg to anything that the upgrade code depends on after it executes.
	* Therefore this must be called after dsl_pool_sync() does the sync
	* tasks.
	*/
	static void
	spa_sync_upgrades(spa_t spa, dmu_tx_t tx)
	{
	if (spa_sync_pass(spa) != 1)
	return;

	dsl_pool_t *dp = spa->spa_dsl_pool;
	rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG);

	if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN &&
	spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) {
	dsl_pool_create_origin(dp, tx);

	/* Keeping the origin open increases spa_minref */
	spa->spa_minref += 3;
	}

	if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES &&
	spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) {
	dsl_pool_upgrade_clones(dp, tx);
	}

	if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES &&
	spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) {
	dsl_pool_upgrade_dir_clones(dp, tx);

	/* Keeping the freedir open increases spa_minref */
	spa->spa_minref += 3;
	}

	if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES &&
	spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) {
	spa_feature_create_zap_objects(spa, tx);
	}

	/*
	* LZ4_COMPRESS feature's behaviour was changed to activate_on_enable
	* when possibility to use lz4 compression for metadata was added
	* Old pools that have this feature enabled must be upgraded to have
	* this feature active
	*/
	if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) {
	boolean_t lz4_en = spa_feature_is_enabled(spa,
	SPA_FEATURE_LZ4_COMPRESS);
	boolean_t lz4_ac = spa_feature_is_active(spa,
	SPA_FEATURE_LZ4_COMPRESS);

	if (lz4_en && !lz4_ac)
	spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx);
	}

	/*
	* If we haven't written the salt, do so now. Note that the
	* feature may not be activated yet, but that's fine since
	* the presence of this ZAP entry is backwards compatible.
	*/
	if (zap_contains(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_CHECKSUM_SALT) == ENOENT) {
	VERIFY0(zap_add(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CHECKSUM_SALT, 1,
	sizeof (spa->spa_cksum_salt.zcs_bytes),
	spa->spa_cksum_salt.zcs_bytes, tx));
	}

	rrw_exit(&dp->dp_config_rwlock, FTAG);
	}

	static void
	vdev_indirect_state_sync_verify(vdev_t *vd)
	{
	vdev_indirect_mapping_t *vim __maybe_unused = vd->vdev_indirect_mapping;
	vdev_indirect_births_t *vib __maybe_unused = vd->vdev_indirect_births;

	if (vd->vdev_ops == &vdev_indirect_ops) {
	ASSERT(vim != NULL);
	ASSERT(vib != NULL);
	}

	uint64_t obsolete_sm_object = 0;
	ASSERT0(vdev_obsolete_sm_object(vd, &obsolete_sm_object));
	if (obsolete_sm_object != 0) {
	ASSERT(vd->vdev_obsolete_sm != NULL);
	ASSERT(vd->vdev_removing \|\|
	vd->vdev_ops == &vdev_indirect_ops);
	ASSERT(vdev_indirect_mapping_num_entries(vim) > 0);
	ASSERT(vdev_indirect_mapping_bytes_mapped(vim) > 0);
	ASSERT3U(obsolete_sm_object, ==,
	space_map_object(vd->vdev_obsolete_sm));
	ASSERT3U(vdev_indirect_mapping_bytes_mapped(vim), >=,
	space_map_allocated(vd->vdev_obsolete_sm));
	}
	ASSERT(vd->vdev_obsolete_segments != NULL);

	/*
	* Since frees / remaps to an indirect vdev can only
	* happen in syncing context, the obsolete segments
	* tree must be empty when we start syncing.
	*/
	ASSERT0(range_tree_space(vd->vdev_obsolete_segments));
	}

	/*
	* Set the top-level vdev's max queue depth. Evaluate each top-level's
	* async write queue depth in case it changed. The max queue depth will
	* not change in the middle of syncing out this txg.
	*/
	static void
	spa_sync_adjust_vdev_max_queue_depth(spa_t *spa)
	{
	ASSERT(spa_writeable(spa));

	vdev_t *rvd = spa->spa_root_vdev;
	uint32_t max_queue_depth = zfs_vdev_async_write_max_active *
	zfs_vdev_queue_depth_pct / 100;
	metaslab_class_t *normal = spa_normal_class(spa);
	metaslab_class_t *special = spa_special_class(spa);
	metaslab_class_t *dedup = spa_dedup_class(spa);

	uint64_t slots_per_allocator = 0;
	for (int c = 0; c < rvd->vdev_children; c++) {
	vdev_t *tvd = rvd->vdev_child[c];

	metaslab_group_t *mg = tvd->vdev_mg;
	if (mg == NULL \|\| !metaslab_group_initialized(mg))
	continue;

	metaslab_class_t *mc = mg->mg_class;
	if (mc != normal && mc != special && mc != dedup)
	continue;

	/*
	* It is safe to do a lock-free check here because only async
	* allocations look at mg_max_alloc_queue_depth, and async
	* allocations all happen from spa_sync().
	*/
	for (int i = 0; i < mg->mg_allocators; i++) {
	ASSERT0(zfs_refcount_count(
	&(mg->mg_allocator[i].mga_alloc_queue_depth)));
	}
	mg->mg_max_alloc_queue_depth = max_queue_depth;

	for (int i = 0; i < mg->mg_allocators; i++) {
	mg->mg_allocator[i].mga_cur_max_alloc_queue_depth =
	zfs_vdev_def_queue_depth;
	}
	slots_per_allocator += zfs_vdev_def_queue_depth;
	}

	for (int i = 0; i < spa->spa_alloc_count; i++) {
	ASSERT0(zfs_refcount_count(&normal->mc_allocator[i].
	mca_alloc_slots));
	ASSERT0(zfs_refcount_count(&special->mc_allocator[i].
	mca_alloc_slots));
	ASSERT0(zfs_refcount_count(&dedup->mc_allocator[i].
	mca_alloc_slots));
	normal->mc_allocator[i].mca_alloc_max_slots =
	slots_per_allocator;
	special->mc_allocator[i].mca_alloc_max_slots =
	slots_per_allocator;
	dedup->mc_allocator[i].mca_alloc_max_slots =
	slots_per_allocator;
	}
	normal->mc_alloc_throttle_enabled = zio_dva_throttle_enabled;
	special->mc_alloc_throttle_enabled = zio_dva_throttle_enabled;
	dedup->mc_alloc_throttle_enabled = zio_dva_throttle_enabled;
	}

	static void
	spa_sync_condense_indirect(spa_t spa, dmu_tx_t tx)
	{
	ASSERT(spa_writeable(spa));

	vdev_t *rvd = spa->spa_root_vdev;
	for (int c = 0; c < rvd->vdev_children; c++) {
	vdev_t *vd = rvd->vdev_child[c];
	vdev_indirect_state_sync_verify(vd);

	if (vdev_indirect_should_condense(vd)) {
	spa_condense_indirect_start_sync(vd, tx);
	break;
	}
	}
	}

	static void
	spa_sync_iterate_to_convergence(spa_t spa, dmu_tx_t tx)
	{
	objset_t *mos = spa->spa_meta_objset;
	dsl_pool_t *dp = spa->spa_dsl_pool;
	uint64_t txg = tx->tx_txg;
	bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK];

	do {
	int pass = ++spa->spa_sync_pass;

	spa_sync_config_object(spa, tx);
	spa_sync_aux_dev(spa, &spa->spa_spares, tx,
	ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES);
	spa_sync_aux_dev(spa, &spa->spa_l2cache, tx,
	ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE);
	spa_errlog_sync(spa, txg);
	dsl_pool_sync(dp, txg);

	if (pass < zfs_sync_pass_deferred_free \|\|
	spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP)) {
	/*
	* If the log space map feature is active we don't
	* care about deferred frees and the deferred bpobj
	* as the log space map should effectively have the
	* same results (i.e. appending only to one object).
	*/
	spa_sync_frees(spa, free_bpl, tx);
	} else {
	/*
	* We can not defer frees in pass 1, because
	* we sync the deferred frees later in pass 1.
	*/
	ASSERT3U(pass, >, 1);
	bplist_iterate(free_bpl, bpobj_enqueue_alloc_cb,
	&spa->spa_deferred_bpobj, tx);
	}

	ddt_sync(spa, txg);
	dsl_scan_sync(dp, tx);
	svr_sync(spa, tx);
	spa_sync_upgrades(spa, tx);

	spa_flush_metaslabs(spa, tx);

	vdev_t *vd = NULL;
	while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, txg))
	!= NULL)
	vdev_sync(vd, txg);

	/*
	* Note: We need to check if the MOS is dirty because we could
	* have marked the MOS dirty without updating the uberblock
	* (e.g. if we have sync tasks but no dirty user data). We need
	* to check the uberblock's rootbp because it is updated if we
	* have synced out dirty data (though in this case the MOS will
	* most likely also be dirty due to second order effects, we
	* don't want to rely on that here).
	*/
	if (pass == 1 &&
	spa->spa_uberblock.ub_rootbp.blk_birth < txg &&
	!dmu_objset_is_dirty(mos, txg)) {
	/*
	* Nothing changed on the first pass, therefore this
	* TXG is a no-op. Avoid syncing deferred frees, so
	* that we can keep this TXG as a no-op.
	*/
	ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg));
	ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg));
	ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg));
	ASSERT(txg_list_empty(&dp->dp_early_sync_tasks, txg));
	break;
	}

	spa_sync_deferred_frees(spa, tx);
	} while (dmu_objset_is_dirty(mos, txg));
	}

	/*
	* Rewrite the vdev configuration (which includes the uberblock) to
	* commit the transaction group.
	*
	* If there are no dirty vdevs, we sync the uberblock to a few random
	* top-level vdevs that are known to be visible in the config cache
	* (see spa_vdev_add() for a complete description). If there are dirty
	* vdevs, sync the uberblock to all vdevs.
	*/
	static void
	spa_sync_rewrite_vdev_config(spa_t spa, dmu_tx_t tx)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	uint64_t txg = tx->tx_txg;

	for (;;) {
	int error = 0;

	/*
	* We hold SCL_STATE to prevent vdev open/close/etc.
	* while we're attempting to write the vdev labels.
	*/
	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);

	if (list_is_empty(&spa->spa_config_dirty_list)) {
	vdev_t *svd[SPA_SYNC_MIN_VDEVS] = { NULL };
	int svdcount = 0;
	int children = rvd->vdev_children;
	- int c0 = spa_get_random(children);
	+ int c0 = random_in_range(children);

	for (int c = 0; c < children; c++) {
	vdev_t *vd =
	rvd->vdev_child[(c0 + c) % children];

	/* Stop when revisiting the first vdev */
	if (c > 0 && svd[0] == vd)
	break;

	if (vd->vdev_ms_array == 0 \|\|
	vd->vdev_islog \|\|
	!vdev_is_concrete(vd))
	continue;

	svd[svdcount++] = vd;
	if (svdcount == SPA_SYNC_MIN_VDEVS)
	break;
	}
	error = vdev_config_sync(svd, svdcount, txg);
	} else {
	error = vdev_config_sync(rvd->vdev_child,
	rvd->vdev_children, txg);
	}

	if (error == 0)
	spa->spa_last_synced_guid = rvd->vdev_guid;

	spa_config_exit(spa, SCL_STATE, FTAG);

	if (error == 0)
	break;
	zio_suspend(spa, NULL, ZIO_SUSPEND_IOERR);
	zio_resume_wait(spa);
	}
	}

	/*
	* Sync the specified transaction group. New blocks may be dirtied as
	* part of the process, so we iterate until it converges.
	*/
	void
	spa_sync(spa_t *spa, uint64_t txg)
	{
	vdev_t *vd = NULL;

	VERIFY(spa_writeable(spa));

	/*
	* Wait for i/os issued in open context that need to complete
	* before this txg syncs.
	*/
	(void) zio_wait(spa->spa_txg_zio[txg & TXG_MASK]);
	spa->spa_txg_zio[txg & TXG_MASK] = zio_root(spa, NULL, NULL,
	ZIO_FLAG_CANFAIL);

	/*
	* Lock out configuration changes.
	*/
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);

	spa->spa_syncing_txg = txg;
	spa->spa_sync_pass = 0;

	for (int i = 0; i < spa->spa_alloc_count; i++) {
	- mutex_enter(&spa->spa_alloc_locks[i]);
	- VERIFY0(avl_numnodes(&spa->spa_alloc_trees[i]));
	- mutex_exit(&spa->spa_alloc_locks[i]);
	+ mutex_enter(&spa->spa_allocs[i].spaa_lock);
	+ VERIFY0(avl_numnodes(&spa->spa_allocs[i].spaa_tree));
	+ mutex_exit(&spa->spa_allocs[i].spaa_lock);
	}

	/*
	* If there are any pending vdev state changes, convert them
	* into config changes that go out with this transaction group.
	*/
	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
	while (list_head(&spa->spa_state_dirty_list) != NULL) {
	/*
	* We need the write lock here because, for aux vdevs,
	* calling vdev_config_dirty() modifies sav_config.
	* This is ugly and will become unnecessary when we
	* eliminate the aux vdev wart by integrating all vdevs
	* into the root vdev tree.
	*/
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	spa_config_enter(spa, SCL_CONFIG \| SCL_STATE, FTAG, RW_WRITER);
	while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) {
	vdev_state_clean(vd);
	vdev_config_dirty(vd);
	}
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	spa_config_enter(spa, SCL_CONFIG \| SCL_STATE, FTAG, RW_READER);
	}
	spa_config_exit(spa, SCL_STATE, FTAG);

	dsl_pool_t *dp = spa->spa_dsl_pool;
	dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg);

	spa->spa_sync_starttime = gethrtime();
	taskq_cancel_id(system_delay_taskq, spa->spa_deadman_tqid);
	spa->spa_deadman_tqid = taskq_dispatch_delay(system_delay_taskq,
	spa_deadman, spa, TQ_SLEEP, ddi_get_lbolt() +
	NSEC_TO_TICK(spa->spa_deadman_synctime));

	/*
	* If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg,
	* set spa_deflate if we have no raid-z vdevs.
	*/
	if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE &&
	spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) {
	vdev_t *rvd = spa->spa_root_vdev;

	int i;
	for (i = 0; i < rvd->vdev_children; i++) {
	vd = rvd->vdev_child[i];
	if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE)
	break;
	}
	if (i == rvd->vdev_children) {
	spa->spa_deflate = TRUE;
	VERIFY0(zap_add(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE,
	sizeof (uint64_t), 1, &spa->spa_deflate, tx));
	}
	}

	spa_sync_adjust_vdev_max_queue_depth(spa);

	spa_sync_condense_indirect(spa, tx);

	spa_sync_iterate_to_convergence(spa, tx);

	#ifdef ZFS_DEBUG
	if (!list_is_empty(&spa->spa_config_dirty_list)) {
	/*
	* Make sure that the number of ZAPs for all the vdevs matches
	* the number of ZAPs in the per-vdev ZAP list. This only gets
	* called if the config is dirty; otherwise there may be
	* outstanding AVZ operations that weren't completed in
	* spa_sync_config_object.
	*/
	uint64_t all_vdev_zap_entry_count;
	ASSERT0(zap_count(spa->spa_meta_objset,
	spa->spa_all_vdev_zaps, &all_vdev_zap_entry_count));
	ASSERT3U(vdev_count_verify_zaps(spa->spa_root_vdev), ==,
	all_vdev_zap_entry_count);
	}
	#endif

	if (spa->spa_vdev_removal != NULL) {
	ASSERT0(spa->spa_vdev_removal->svr_bytes_done[txg & TXG_MASK]);
	}

	spa_sync_rewrite_vdev_config(spa, tx);
	dmu_tx_commit(tx);

	taskq_cancel_id(system_delay_taskq, spa->spa_deadman_tqid);
	spa->spa_deadman_tqid = 0;

	/*
	* Clear the dirty config list.
	*/
	while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL)
	vdev_config_clean(vd);

	/*
	* Now that the new config has synced transactionally,
	* let it become visible to the config cache.
	*/
	if (spa->spa_config_syncing != NULL) {
	spa_config_set(spa, spa->spa_config_syncing);
	spa->spa_config_txg = txg;
	spa->spa_config_syncing = NULL;
	}

	dsl_pool_sync_done(dp, txg);

	for (int i = 0; i < spa->spa_alloc_count; i++) {
	- mutex_enter(&spa->spa_alloc_locks[i]);
	- VERIFY0(avl_numnodes(&spa->spa_alloc_trees[i]));
	- mutex_exit(&spa->spa_alloc_locks[i]);
	+ mutex_enter(&spa->spa_allocs[i].spaa_lock);
	+ VERIFY0(avl_numnodes(&spa->spa_allocs[i].spaa_tree));
	+ mutex_exit(&spa->spa_allocs[i].spaa_lock);
	}

	/*
	* Update usable space statistics.
	*/
	while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg)))
	!= NULL)
	vdev_sync_done(vd, txg);

	metaslab_class_evict_old(spa->spa_normal_class, txg);
	metaslab_class_evict_old(spa->spa_log_class, txg);

	spa_sync_close_syncing_log_sm(spa);

	spa_update_dspace(spa);

	/*
	* It had better be the case that we didn't dirty anything
	* since vdev_config_sync().
	*/
	ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg));
	ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg));
	ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg));

	while (zfs_pause_spa_sync)
	delay(1);

	spa->spa_sync_pass = 0;

	/*
	* Update the last synced uberblock here. We want to do this at
	* the end of spa_sync() so that consumers of spa_last_synced_txg()
	* will be guaranteed that all the processing associated with
	* that txg has been completed.
	*/
	spa->spa_ubsync = spa->spa_uberblock;
	spa_config_exit(spa, SCL_CONFIG, FTAG);

	spa_handle_ignored_writes(spa);

	/*
	* If any async tasks have been requested, kick them off.
	*/
	spa_async_dispatch(spa);
	}

	/*
	* Sync all pools. We don't want to hold the namespace lock across these
	* operations, so we take a reference on the spa_t and drop the lock during the
	* sync.
	*/
	void
	spa_sync_allpools(void)
	{
	spa_t *spa = NULL;
	mutex_enter(&spa_namespace_lock);
	while ((spa = spa_next(spa)) != NULL) {
	if (spa_state(spa) != POOL_STATE_ACTIVE \|\|
	!spa_writeable(spa) \|\| spa_suspended(spa))
	continue;
	spa_open_ref(spa, FTAG);
	mutex_exit(&spa_namespace_lock);
	txg_wait_synced(spa_get_dsl(spa), 0);
	mutex_enter(&spa_namespace_lock);
	spa_close(spa, FTAG);
	}
	mutex_exit(&spa_namespace_lock);
	}

	/*
	* ==========================================================================
	* Miscellaneous routines
	* ==========================================================================
	*/

	/*
	* Remove all pools in the system.
	*/
	void
	spa_evict_all(void)
	{
	spa_t *spa;

	/*
	* Remove all cached state. All pools should be closed now,
	* so every spa in the AVL tree should be unreferenced.
	*/
	mutex_enter(&spa_namespace_lock);
	while ((spa = spa_next(NULL)) != NULL) {
	/*
	* Stop async tasks. The async thread may need to detach
	* a device that's been replaced, which requires grabbing
	* spa_namespace_lock, so we must drop it here.
	*/
	spa_open_ref(spa, FTAG);
	mutex_exit(&spa_namespace_lock);
	spa_async_suspend(spa);
	mutex_enter(&spa_namespace_lock);
	spa_close(spa, FTAG);

	if (spa->spa_state != POOL_STATE_UNINITIALIZED) {
	spa_unload(spa);
	spa_deactivate(spa);
	}
	spa_remove(spa);
	}
	mutex_exit(&spa_namespace_lock);
	}

	vdev_t *
	spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux)
	{
	vdev_t *vd;
	int i;

	if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL)
	return (vd);

	if (aux) {
	for (i = 0; i < spa->spa_l2cache.sav_count; i++) {
	vd = spa->spa_l2cache.sav_vdevs[i];
	if (vd->vdev_guid == guid)
	return (vd);
	}

	for (i = 0; i < spa->spa_spares.sav_count; i++) {
	vd = spa->spa_spares.sav_vdevs[i];
	if (vd->vdev_guid == guid)
	return (vd);
	}
	}

	return (NULL);
	}

	void
	spa_upgrade(spa_t *spa, uint64_t version)
	{
	ASSERT(spa_writeable(spa));

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);

	/*
	* This should only be called for a non-faulted pool, and since a
	* future version would result in an unopenable pool, this shouldn't be
	* possible.
	*/
	ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version));
	ASSERT3U(version, >=, spa->spa_uberblock.ub_version);

	spa->spa_uberblock.ub_version = version;
	vdev_config_dirty(spa->spa_root_vdev);

	spa_config_exit(spa, SCL_ALL, FTAG);

	txg_wait_synced(spa_get_dsl(spa), 0);
	}

	boolean_t
	spa_has_spare(spa_t *spa, uint64_t guid)
	{
	int i;
	uint64_t spareguid;
	spa_aux_vdev_t *sav = &spa->spa_spares;

	for (i = 0; i < sav->sav_count; i++)
	if (sav->sav_vdevs[i]->vdev_guid == guid)
	return (B_TRUE);

	for (i = 0; i < sav->sav_npending; i++) {
	if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID,
	&spareguid) == 0 && spareguid == guid)
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	/*
	* Check if a pool has an active shared spare device.
	* Note: reference count of an active spare is 2, as a spare and as a replace
	*/
	static boolean_t
	spa_has_active_shared_spare(spa_t *spa)
	{
	int i, refcnt;
	uint64_t pool;
	spa_aux_vdev_t *sav = &spa->spa_spares;

	for (i = 0; i < sav->sav_count; i++) {
	if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool,
	&refcnt) && pool != 0ULL && pool == spa_guid(spa) &&
	refcnt > 2)
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	uint64_t
	spa_total_metaslabs(spa_t *spa)
	{
	vdev_t *rvd = spa->spa_root_vdev;

	uint64_t m = 0;
	for (uint64_t c = 0; c < rvd->vdev_children; c++) {
	vdev_t *vd = rvd->vdev_child[c];
	if (!vdev_is_concrete(vd))
	continue;
	m += vd->vdev_ms_count;
	}
	return (m);
	}

	/*
	* Notify any waiting threads that some activity has switched from being in-
	* progress to not-in-progress so that the thread can wake up and determine
	* whether it is finished waiting.
	*/
	void
	spa_notify_waiters(spa_t *spa)
	{
	/*
	* Acquiring spa_activities_lock here prevents the cv_broadcast from
	* happening between the waiting thread's check and cv_wait.
	*/
	mutex_enter(&spa->spa_activities_lock);
	cv_broadcast(&spa->spa_activities_cv);
	mutex_exit(&spa->spa_activities_lock);
	}

	/*
	* Notify any waiting threads that the pool is exporting, and then block until
	* they are finished using the spa_t.
	*/
	void
	spa_wake_waiters(spa_t *spa)
	{
	mutex_enter(&spa->spa_activities_lock);
	spa->spa_waiters_cancel = B_TRUE;
	cv_broadcast(&spa->spa_activities_cv);
	while (spa->spa_waiters != 0)
	cv_wait(&spa->spa_waiters_cv, &spa->spa_activities_lock);
	spa->spa_waiters_cancel = B_FALSE;
	mutex_exit(&spa->spa_activities_lock);
	}

	/* Whether the vdev or any of its descendants are being initialized/trimmed. */
	static boolean_t
	spa_vdev_activity_in_progress_impl(vdev_t *vd, zpool_wait_activity_t activity)
	{
	spa_t *spa = vd->vdev_spa;

	ASSERT(spa_config_held(spa, SCL_CONFIG \| SCL_STATE, RW_READER));
	ASSERT(MUTEX_HELD(&spa->spa_activities_lock));
	ASSERT(activity == ZPOOL_WAIT_INITIALIZE \|\|
	activity == ZPOOL_WAIT_TRIM);

	kmutex_t *lock = activity == ZPOOL_WAIT_INITIALIZE ?
	&vd->vdev_initialize_lock : &vd->vdev_trim_lock;

	mutex_exit(&spa->spa_activities_lock);
	mutex_enter(lock);
	mutex_enter(&spa->spa_activities_lock);

	boolean_t in_progress = (activity == ZPOOL_WAIT_INITIALIZE) ?
	(vd->vdev_initialize_state == VDEV_INITIALIZE_ACTIVE) :
	(vd->vdev_trim_state == VDEV_TRIM_ACTIVE);
	mutex_exit(lock);

	if (in_progress)
	return (B_TRUE);

	for (int i = 0; i < vd->vdev_children; i++) {
	if (spa_vdev_activity_in_progress_impl(vd->vdev_child[i],
	activity))
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	/*
	* If use_guid is true, this checks whether the vdev specified by guid is
	* being initialized/trimmed. Otherwise, it checks whether any vdev in the pool
	* is being initialized/trimmed. The caller must hold the config lock and
	* spa_activities_lock.
	*/
	static int
	spa_vdev_activity_in_progress(spa_t *spa, boolean_t use_guid, uint64_t guid,
	zpool_wait_activity_t activity, boolean_t *in_progress)
	{
	mutex_exit(&spa->spa_activities_lock);
	spa_config_enter(spa, SCL_CONFIG \| SCL_STATE, FTAG, RW_READER);
	mutex_enter(&spa->spa_activities_lock);

	vdev_t *vd;
	if (use_guid) {
	vd = spa_lookup_by_guid(spa, guid, B_FALSE);
	if (vd == NULL \|\| !vd->vdev_ops->vdev_op_leaf) {
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (EINVAL);
	}
	} else {
	vd = spa->spa_root_vdev;
	}

	*in_progress = spa_vdev_activity_in_progress_impl(vd, activity);

	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	return (0);
	}

	/*
	* Locking for waiting threads
	* ---------------------------
	*
	* Waiting threads need a way to check whether a given activity is in progress,
	* and then, if it is, wait for it to complete. Each activity will have some
	* in-memory representation of the relevant on-disk state which can be used to
	* determine whether or not the activity is in progress. The in-memory state and
	* the locking used to protect it will be different for each activity, and may
	* not be suitable for use with a cvar (e.g., some state is protected by the
	* config lock). To allow waiting threads to wait without any races, another
	* lock, spa_activities_lock, is used.
	*
	* When the state is checked, both the activity-specific lock (if there is one)
	* and spa_activities_lock are held. In some cases, the activity-specific lock
	* is acquired explicitly (e.g. the config lock). In others, the locking is
	* internal to some check (e.g. bpobj_is_empty). After checking, the waiting
	* thread releases the activity-specific lock and, if the activity is in
	* progress, then cv_waits using spa_activities_lock.
	*
	* The waiting thread is woken when another thread, one completing some
	* activity, updates the state of the activity and then calls
	* spa_notify_waiters, which will cv_broadcast. This 'completing' thread only
	* needs to hold its activity-specific lock when updating the state, and this
	* lock can (but doesn't have to) be dropped before calling spa_notify_waiters.
	*
	* Because spa_notify_waiters acquires spa_activities_lock before broadcasting,
	* and because it is held when the waiting thread checks the state of the
	* activity, it can never be the case that the completing thread both updates
	* the activity state and cv_broadcasts in between the waiting thread's check
	* and cv_wait. Thus, a waiting thread can never miss a wakeup.
	*
	* In order to prevent deadlock, when the waiting thread does its check, in some
	* cases it will temporarily drop spa_activities_lock in order to acquire the
	* activity-specific lock. The order in which spa_activities_lock and the
	* activity specific lock are acquired in the waiting thread is determined by
	* the order in which they are acquired in the completing thread; if the
	* completing thread calls spa_notify_waiters with the activity-specific lock
	* held, then the waiting thread must also acquire the activity-specific lock
	* first.
	*/

	static int
	spa_activity_in_progress(spa_t *spa, zpool_wait_activity_t activity,
	boolean_t use_tag, uint64_t tag, boolean_t *in_progress)
	{
	int error = 0;

	ASSERT(MUTEX_HELD(&spa->spa_activities_lock));

	switch (activity) {
	case ZPOOL_WAIT_CKPT_DISCARD:
	*in_progress =
	(spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT) &&
	zap_contains(spa_meta_objset(spa),
	DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_ZPOOL_CHECKPOINT) ==
	ENOENT);
	break;
	case ZPOOL_WAIT_FREE:
	*in_progress = ((spa_version(spa) >= SPA_VERSION_DEADLISTS &&
	!bpobj_is_empty(&spa->spa_dsl_pool->dp_free_bpobj)) \|\|
	spa_feature_is_active(spa, SPA_FEATURE_ASYNC_DESTROY) \|\|
	spa_livelist_delete_check(spa));
	break;
	case ZPOOL_WAIT_INITIALIZE:
	case ZPOOL_WAIT_TRIM:
	error = spa_vdev_activity_in_progress(spa, use_tag, tag,
	activity, in_progress);
	break;
	case ZPOOL_WAIT_REPLACE:
	mutex_exit(&spa->spa_activities_lock);
	spa_config_enter(spa, SCL_CONFIG \| SCL_STATE, FTAG, RW_READER);
	mutex_enter(&spa->spa_activities_lock);

	*in_progress = vdev_replace_in_progress(spa->spa_root_vdev);
	spa_config_exit(spa, SCL_CONFIG \| SCL_STATE, FTAG);
	break;
	case ZPOOL_WAIT_REMOVE:
	*in_progress = (spa->spa_removing_phys.sr_state ==
	DSS_SCANNING);
	break;
	case ZPOOL_WAIT_RESILVER:
	if ((*in_progress = vdev_rebuild_active(spa->spa_root_vdev)))
	break;
	/* fall through */
	case ZPOOL_WAIT_SCRUB:
	{
	boolean_t scanning, paused, is_scrub;
	dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;

	is_scrub = (scn->scn_phys.scn_func == POOL_SCAN_SCRUB);
	scanning = (scn->scn_phys.scn_state == DSS_SCANNING);
	paused = dsl_scan_is_paused_scrub(scn);
	*in_progress = (scanning && !paused &&
	is_scrub == (activity == ZPOOL_WAIT_SCRUB));
	break;
	}
	default:
	panic("unrecognized value for activity %d", activity);
	}

	return (error);
	}

	static int
	spa_wait_common(const char *pool, zpool_wait_activity_t activity,
	boolean_t use_tag, uint64_t tag, boolean_t *waited)
	{
	/*
	* The tag is used to distinguish between instances of an activity.
	* 'initialize' and 'trim' are the only activities that we use this for.
	* The other activities can only have a single instance in progress in a
	* pool at one time, making the tag unnecessary.
	*
	* There can be multiple devices being replaced at once, but since they
	* all finish once resilvering finishes, we don't bother keeping track
	* of them individually, we just wait for them all to finish.
	*/
	if (use_tag && activity != ZPOOL_WAIT_INITIALIZE &&
	activity != ZPOOL_WAIT_TRIM)
	return (EINVAL);

	if (activity < 0 \|\| activity >= ZPOOL_WAIT_NUM_ACTIVITIES)
	return (EINVAL);

	spa_t *spa;
	int error = spa_open(pool, &spa, FTAG);
	if (error != 0)
	return (error);

	/*
	* Increment the spa's waiter count so that we can call spa_close and
	* still ensure that the spa_t doesn't get freed before this thread is
	* finished with it when the pool is exported. We want to call spa_close
	* before we start waiting because otherwise the additional ref would
	* prevent the pool from being exported or destroyed throughout the
	* potentially long wait.
	*/
	mutex_enter(&spa->spa_activities_lock);
	spa->spa_waiters++;
	spa_close(spa, FTAG);

	*waited = B_FALSE;
	for (;;) {
	boolean_t in_progress;
	error = spa_activity_in_progress(spa, activity, use_tag, tag,
	&in_progress);

	if (error \|\| !in_progress \|\| spa->spa_waiters_cancel)
	break;

	*waited = B_TRUE;

	if (cv_wait_sig(&spa->spa_activities_cv,
	&spa->spa_activities_lock) == 0) {
	error = EINTR;
	break;
	}
	}

	spa->spa_waiters--;
	cv_signal(&spa->spa_waiters_cv);
	mutex_exit(&spa->spa_activities_lock);

	return (error);
	}

	/*
	* Wait for a particular instance of the specified activity to complete, where
	* the instance is identified by 'tag'
	*/
	int
	spa_wait_tag(const char *pool, zpool_wait_activity_t activity, uint64_t tag,
	boolean_t *waited)
	{
	return (spa_wait_common(pool, activity, B_TRUE, tag, waited));
	}

	/*
	* Wait for all instances of the specified activity complete
	*/
	int
	spa_wait(const char pool, zpool_wait_activity_t activity, boolean_t waited)
	{

	return (spa_wait_common(pool, activity, B_FALSE, 0, waited));
	}

	sysevent_t *
	spa_event_create(spa_t spa, vdev_t vd, nvlist_t hist_nvl, const char name)
	{
	sysevent_t *ev = NULL;
	#ifdef _KERNEL
	nvlist_t *resource;

	resource = zfs_event_create(spa, vd, FM_SYSEVENT_CLASS, name, hist_nvl);
	if (resource) {
	ev = kmem_alloc(sizeof (sysevent_t), KM_SLEEP);
	ev->resource = resource;
	}
	#endif
	return (ev);
	}

	void
	spa_event_post(sysevent_t *ev)
	{
	#ifdef _KERNEL
	if (ev) {
	zfs_zevent_post(ev->resource, NULL, zfs_zevent_post_cb);
	kmem_free(ev, sizeof (*ev));
	}
	#endif
	}

	/*
	* Post a zevent corresponding to the given sysevent. The 'name' must be one
	* of the event definitions in sys/sysevent/eventdefs.h. The payload will be
	* filled in from the spa and (optionally) the vdev. This doesn't do anything
	* in the userland libzpool, as we don't want consumers to misinterpret ztest
	* or zdb as real changes.
	*/
	void
	spa_event_notify(spa_t spa, vdev_t vd, nvlist_t hist_nvl, const char name)
	{
	spa_event_post(spa_event_create(spa, vd, hist_nvl, name));
	}

	/* state manipulation functions */
	EXPORT_SYMBOL(spa_open);
	EXPORT_SYMBOL(spa_open_rewind);
	EXPORT_SYMBOL(spa_get_stats);
	EXPORT_SYMBOL(spa_create);
	EXPORT_SYMBOL(spa_import);
	EXPORT_SYMBOL(spa_tryimport);
	EXPORT_SYMBOL(spa_destroy);
	EXPORT_SYMBOL(spa_export);
	EXPORT_SYMBOL(spa_reset);
	EXPORT_SYMBOL(spa_async_request);
	EXPORT_SYMBOL(spa_async_suspend);
	EXPORT_SYMBOL(spa_async_resume);
	EXPORT_SYMBOL(spa_inject_addref);
	EXPORT_SYMBOL(spa_inject_delref);
	EXPORT_SYMBOL(spa_scan_stat_init);
	EXPORT_SYMBOL(spa_scan_get_stats);

	/* device manipulation */
	EXPORT_SYMBOL(spa_vdev_add);
	EXPORT_SYMBOL(spa_vdev_attach);
	EXPORT_SYMBOL(spa_vdev_detach);
	EXPORT_SYMBOL(spa_vdev_setpath);
	EXPORT_SYMBOL(spa_vdev_setfru);
	EXPORT_SYMBOL(spa_vdev_split_mirror);

	/* spare statech is global across all pools) */
	EXPORT_SYMBOL(spa_spare_add);
	EXPORT_SYMBOL(spa_spare_remove);
	EXPORT_SYMBOL(spa_spare_exists);
	EXPORT_SYMBOL(spa_spare_activate);

	/* L2ARC statech is global across all pools) */
	EXPORT_SYMBOL(spa_l2cache_add);
	EXPORT_SYMBOL(spa_l2cache_remove);
	EXPORT_SYMBOL(spa_l2cache_exists);
	EXPORT_SYMBOL(spa_l2cache_activate);
	EXPORT_SYMBOL(spa_l2cache_drop);

	/* scanning */
	EXPORT_SYMBOL(spa_scan);
	EXPORT_SYMBOL(spa_scan_stop);

	/* spa syncing */
	EXPORT_SYMBOL(spa_sync); /* only for DMU use */
	EXPORT_SYMBOL(spa_sync_allpools);

	/* properties */
	EXPORT_SYMBOL(spa_prop_set);
	EXPORT_SYMBOL(spa_prop_get);
	EXPORT_SYMBOL(spa_prop_clear_bootfs);

	/* asynchronous event notification */
	EXPORT_SYMBOL(spa_event_notify);

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_spa, spa_, load_verify_shift, INT, ZMOD_RW,
	"log2 fraction of arc that can be used by inflight I/Os when "
	"verifying pool during import");

	ZFS_MODULE_PARAM(zfs_spa, spa_, load_verify_metadata, INT, ZMOD_RW,
	"Set to traverse metadata on pool import");

	ZFS_MODULE_PARAM(zfs_spa, spa_, load_verify_data, INT, ZMOD_RW,
	"Set to traverse data on pool import");

	ZFS_MODULE_PARAM(zfs_spa, spa_, load_print_vdev_tree, INT, ZMOD_RW,
	"Print vdev tree to zfs_dbgmsg during pool import");

	ZFS_MODULE_PARAM(zfs_zio, zio_, taskq_batch_pct, UINT, ZMOD_RD,
	"Percentage of CPUs to run an IO worker thread");

	ZFS_MODULE_PARAM(zfs_zio, zio_, taskq_batch_tpq, UINT, ZMOD_RD,
	"Number of threads per IO worker taskqueue");

	ZFS_MODULE_PARAM(zfs, zfs_, max_missing_tvds, ULONG, ZMOD_RW,
	"Allow importing pool with up to this number of missing top-level "
	"vdevs (in read-only mode)");

	ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, zthr_pause, INT, ZMOD_RW,
	"Set the livelist condense zthr to pause");

	ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, sync_pause, INT, ZMOD_RW,
	"Set the livelist condense synctask to pause");

	ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, sync_cancel, INT, ZMOD_RW,
	"Whether livelist condensing was canceled in the synctask");

	ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, zthr_cancel, INT, ZMOD_RW,
	"Whether livelist condensing was canceled in the zthr function");

	ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, new_alloc, INT, ZMOD_RW,
	"Whether extra ALLOC blkptrs were added to a livelist entry while it "
	"was being condensed");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/spa_misc.c b/sys/contrib/openzfs/module/zfs/spa_misc.c
	index 65b0988d675b..00515db027d0 100644
	--- a/sys/contrib/openzfs/module/zfs/spa_misc.c
	+++ b/sys/contrib/openzfs/module/zfs/spa_misc.c
	@@ -1,2960 +1,2966 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
	* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
	* Copyright 2013 Saso Kiselkov. All rights reserved.
	* Copyright (c) 2017 Datto Inc.
	* Copyright (c) 2017, Intel Corporation.
	* Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/spa_impl.h>
	#include <sys/zio.h>
	#include <sys/zio_checksum.h>
	#include <sys/zio_compress.h>
	#include <sys/dmu.h>
	#include <sys/dmu_tx.h>
	#include <sys/zap.h>
	#include <sys/zil.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_initialize.h>
	#include <sys/vdev_trim.h>
	#include <sys/vdev_file.h>
	#include <sys/vdev_raidz.h>
	#include <sys/metaslab.h>
	#include <sys/uberblock_impl.h>
	#include <sys/txg.h>
	#include <sys/avl.h>
	#include <sys/unique.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_prop.h>
	#include <sys/fm/util.h>
	#include <sys/dsl_scan.h>
	#include <sys/fs/zfs.h>
	#include <sys/metaslab_impl.h>
	#include <sys/arc.h>
	#include <sys/ddt.h>
	#include <sys/kstat.h>
	#include "zfs_prop.h"
	#include <sys/btree.h>
	#include <sys/zfeature.h>
	#include <sys/qat.h>
	#include <sys/zstd/zstd.h>

	/*
	* SPA locking
	*
	* There are three basic locks for managing spa_t structures:
	*
	* spa_namespace_lock (global mutex)
	*
	* This lock must be acquired to do any of the following:
	*
	* - Lookup a spa_t by name
	* - Add or remove a spa_t from the namespace
	* - Increase spa_refcount from non-zero
	* - Check if spa_refcount is zero
	* - Rename a spa_t
	* - add/remove/attach/detach devices
	* - Held for the duration of create/destroy/import/export
	*
	* It does not need to handle recursion. A create or destroy may
	* reference objects (files or zvols) in other pools, but by
	* definition they must have an existing reference, and will never need
	* to lookup a spa_t by name.
	*
	* spa_refcount (per-spa zfs_refcount_t protected by mutex)
	*
	* This reference count keep track of any active users of the spa_t. The
	* spa_t cannot be destroyed or freed while this is non-zero. Internally,
	* the refcount is never really 'zero' - opening a pool implicitly keeps
	* some references in the DMU. Internally we check against spa_minref, but
	* present the image of a zero/non-zero value to consumers.
	*
	* spa_config_lock[] (per-spa array of rwlocks)
	*
	* This protects the spa_t from config changes, and must be held in
	* the following circumstances:
	*
	* - RW_READER to perform I/O to the spa
	* - RW_WRITER to change the vdev config
	*
	* The locking order is fairly straightforward:
	*
	* spa_namespace_lock -> spa_refcount
	*
	* The namespace lock must be acquired to increase the refcount from 0
	* or to check if it is zero.
	*
	* spa_refcount -> spa_config_lock[]
	*
	* There must be at least one valid reference on the spa_t to acquire
	* the config lock.
	*
	* spa_namespace_lock -> spa_config_lock[]
	*
	* The namespace lock must always be taken before the config lock.
	*
	*
	* The spa_namespace_lock can be acquired directly and is globally visible.
	*
	* The namespace is manipulated using the following functions, all of which
	* require the spa_namespace_lock to be held.
	*
	* spa_lookup() Lookup a spa_t by name.
	*
	* spa_add() Create a new spa_t in the namespace.
	*
	* spa_remove() Remove a spa_t from the namespace. This also
	* frees up any memory associated with the spa_t.
	*
	* spa_next() Returns the next spa_t in the system, or the
	* first if NULL is passed.
	*
	* spa_evict_all() Shutdown and remove all spa_t structures in
	* the system.
	*
	* spa_guid_exists() Determine whether a pool/device guid exists.
	*
	* The spa_refcount is manipulated using the following functions:
	*
	* spa_open_ref() Adds a reference to the given spa_t. Must be
	* called with spa_namespace_lock held if the
	* refcount is currently zero.
	*
	* spa_close() Remove a reference from the spa_t. This will
	* not free the spa_t or remove it from the
	* namespace. No locking is required.
	*
	* spa_refcount_zero() Returns true if the refcount is currently
	* zero. Must be called with spa_namespace_lock
	* held.
	*
	* The spa_config_lock[] is an array of rwlocks, ordered as follows:
	* SCL_CONFIG > SCL_STATE > SCL_ALLOC > SCL_ZIO > SCL_FREE > SCL_VDEV.
	* spa_config_lock[] is manipulated with spa_config_{enter,exit,held}().
	*
	* To read the configuration, it suffices to hold one of these locks as reader.
	* To modify the configuration, you must hold all locks as writer. To modify
	* vdev state without altering the vdev tree's topology (e.g. online/offline),
	* you must hold SCL_STATE and SCL_ZIO as writer.
	*
	* We use these distinct config locks to avoid recursive lock entry.
	* For example, spa_sync() (which holds SCL_CONFIG as reader) induces
	* block allocations (SCL_ALLOC), which may require reading space maps
	* from disk (dmu_read() -> zio_read() -> SCL_ZIO).
	*
	* The spa config locks cannot be normal rwlocks because we need the
	* ability to hand off ownership. For example, SCL_ZIO is acquired
	* by the issuing thread and later released by an interrupt thread.
	* They do, however, obey the usual write-wanted semantics to prevent
	* writer (i.e. system administrator) starvation.
	*
	* The lock acquisition rules are as follows:
	*
	* SCL_CONFIG
	* Protects changes to the vdev tree topology, such as vdev
	* add/remove/attach/detach. Protects the dirty config list
	* (spa_config_dirty_list) and the set of spares and l2arc devices.
	*
	* SCL_STATE
	* Protects changes to pool state and vdev state, such as vdev
	* online/offline/fault/degrade/clear. Protects the dirty state list
	* (spa_state_dirty_list) and global pool state (spa_state).
	*
	* SCL_ALLOC
	* Protects changes to metaslab groups and classes.
	* Held as reader by metaslab_alloc() and metaslab_claim().
	*
	* SCL_ZIO
	* Held by bp-level zios (those which have no io_vd upon entry)
	* to prevent changes to the vdev tree. The bp-level zio implicitly
	* protects all of its vdev child zios, which do not hold SCL_ZIO.
	*
	* SCL_FREE
	* Protects changes to metaslab groups and classes.
	* Held as reader by metaslab_free(). SCL_FREE is distinct from
	* SCL_ALLOC, and lower than SCL_ZIO, so that we can safely free
	* blocks in zio_done() while another i/o that holds either
	* SCL_ALLOC or SCL_ZIO is waiting for this i/o to complete.
	*
	* SCL_VDEV
	* Held as reader to prevent changes to the vdev tree during trivial
	* inquiries such as bp_get_dsize(). SCL_VDEV is distinct from the
	* other locks, and lower than all of them, to ensure that it's safe
	* to acquire regardless of caller context.
	*
	* In addition, the following rules apply:
	*
	* (a) spa_props_lock protects pool properties, spa_config and spa_config_list.
	* The lock ordering is SCL_CONFIG > spa_props_lock.
	*
	* (b) I/O operations on leaf vdevs. For any zio operation that takes
	* an explicit vdev_t argument -- such as zio_ioctl(), zio_read_phys(),
	* or zio_write_phys() -- the caller must ensure that the config cannot
	* cannot change in the interim, and that the vdev cannot be reopened.
	* SCL_STATE as reader suffices for both.
	*
	* The vdev configuration is protected by spa_vdev_enter() / spa_vdev_exit().
	*
	* spa_vdev_enter() Acquire the namespace lock and the config lock
	* for writing.
	*
	* spa_vdev_exit() Release the config lock, wait for all I/O
	* to complete, sync the updated configs to the
	* cache, and release the namespace lock.
	*
	* vdev state is protected by spa_vdev_state_enter() / spa_vdev_state_exit().
	* Like spa_vdev_enter/exit, these are convenience wrappers -- the actual
	* locking is, always, based on spa_namespace_lock and spa_config_lock[].
	*/

	static avl_tree_t spa_namespace_avl;
	kmutex_t spa_namespace_lock;
	static kcondvar_t spa_namespace_cv;
	int spa_max_replication_override = SPA_DVAS_PER_BP;

	static kmutex_t spa_spare_lock;
	static avl_tree_t spa_spare_avl;
	static kmutex_t spa_l2cache_lock;
	static avl_tree_t spa_l2cache_avl;

	kmem_cache_t *spa_buffer_pool;
	spa_mode_t spa_mode_global = SPA_MODE_UNINIT;

	#ifdef ZFS_DEBUG
	/*
	* Everything except dprintf, set_error, spa, and indirect_remap is on
	* by default in debug builds.
	*/
	int zfs_flags = ~(ZFS_DEBUG_DPRINTF \| ZFS_DEBUG_SET_ERROR \|
	ZFS_DEBUG_INDIRECT_REMAP);
	#else
	int zfs_flags = 0;
	#endif

	/*
	* zfs_recover can be set to nonzero to attempt to recover from
	* otherwise-fatal errors, typically caused by on-disk corruption. When
	* set, calls to zfs_panic_recover() will turn into warning messages.
	* This should only be used as a last resort, as it typically results
	* in leaked space, or worse.
	*/
	int zfs_recover = B_FALSE;

	/*
	* If destroy encounters an EIO while reading metadata (e.g. indirect
	* blocks), space referenced by the missing metadata can not be freed.
	* Normally this causes the background destroy to become "stalled", as
	* it is unable to make forward progress. While in this stalled state,
	* all remaining space to free from the error-encountering filesystem is
	* "temporarily leaked". Set this flag to cause it to ignore the EIO,
	* permanently leak the space from indirect blocks that can not be read,
	* and continue to free everything else that it can.
	*
	* The default, "stalling" behavior is useful if the storage partially
	* fails (i.e. some but not all i/os fail), and then later recovers. In
	* this case, we will be able to continue pool operations while it is
	* partially failed, and when it recovers, we can continue to free the
	* space, with no leaks. However, note that this case is actually
	* fairly rare.
	*
	* Typically pools either (a) fail completely (but perhaps temporarily,
	* e.g. a top-level vdev going offline), or (b) have localized,
	* permanent errors (e.g. disk returns the wrong data due to bit flip or
	* firmware bug). In case (a), this setting does not matter because the
	* pool will be suspended and the sync thread will not be able to make
	* forward progress regardless. In case (b), because the error is
	* permanent, the best we can do is leak the minimum amount of space,
	* which is what setting this flag will do. Therefore, it is reasonable
	* for this flag to normally be set, but we chose the more conservative
	* approach of not setting it, so that there is no possibility of
	* leaking space in the "partial temporary" failure case.
	*/
	int zfs_free_leak_on_eio = B_FALSE;

	/*
	* Expiration time in milliseconds. This value has two meanings. First it is
	* used to determine when the spa_deadman() logic should fire. By default the
	* spa_deadman() will fire if spa_sync() has not completed in 600 seconds.
	* Secondly, the value determines if an I/O is considered "hung". Any I/O that
	* has not completed in zfs_deadman_synctime_ms is considered "hung" resulting
	* in one of three behaviors controlled by zfs_deadman_failmode.
	*/
	unsigned long zfs_deadman_synctime_ms = 600000UL;

	/*
	* This value controls the maximum amount of time zio_wait() will block for an
	* outstanding IO. By default this is 300 seconds at which point the "hung"
	* behavior will be applied as described for zfs_deadman_synctime_ms.
	*/
	unsigned long zfs_deadman_ziotime_ms = 300000UL;

	/*
	* Check time in milliseconds. This defines the frequency at which we check
	* for hung I/O.
	*/
	unsigned long zfs_deadman_checktime_ms = 60000UL;

	/*
	* By default the deadman is enabled.
	*/
	int zfs_deadman_enabled = 1;

	/*
	* Controls the behavior of the deadman when it detects a "hung" I/O.
	* Valid values are zfs_deadman_failmode=<wait\|continue\|panic>.
	*
	* wait - Wait for the "hung" I/O (default)
	* continue - Attempt to recover from a "hung" I/O
	* panic - Panic the system
	*/
	char *zfs_deadman_failmode = "wait";

	/*
	* The worst case is single-sector max-parity RAID-Z blocks, in which
	* case the space requirement is exactly (VDEV_RAIDZ_MAXPARITY + 1)
	* times the size; so just assume that. Add to this the fact that
	* we can have up to 3 DVAs per bp, and one more factor of 2 because
	* the block may be dittoed with up to 3 DVAs by ddt_sync(). All together,
	* the worst case is:
	* (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
	*/
	int spa_asize_inflation = 24;

	/*
	* Normally, we don't allow the last 3.2% (1/(2^spa_slop_shift)) of space in
	* the pool to be consumed (bounded by spa_max_slop). This ensures that we
	* don't run the pool completely out of space, due to unaccounted changes (e.g.
	* to the MOS). It also limits the worst-case time to allocate space. If we
	* have less than this amount of free space, most ZPL operations (e.g. write,
	* create) will return ENOSPC. The ZIL metaslabs (spa_embedded_log_class) are
	* also part of this 3.2% of space which can't be consumed by normal writes;
	* the slop space "proper" (spa_get_slop_space()) is decreased by the embedded
	* log space.
	*
	* Certain operations (e.g. file removal, most administrative actions) can
	* use half the slop space. They will only return ENOSPC if less than half
	* the slop space is free. Typically, once the pool has less than the slop
	* space free, the user will use these operations to free up space in the pool.
	* These are the operations that call dsl_pool_adjustedsize() with the netfree
	* argument set to TRUE.
	*
	* Operations that are almost guaranteed to free up space in the absence of
	* a pool checkpoint can use up to three quarters of the slop space
	* (e.g zfs destroy).
	*
	* A very restricted set of operations are always permitted, regardless of
	* the amount of free space. These are the operations that call
	* dsl_sync_task(ZFS_SPACE_CHECK_NONE). If these operations result in a net
	* increase in the amount of space used, it is possible to run the pool
	* completely out of space, causing it to be permanently read-only.
	*
	* Note that on very small pools, the slop space will be larger than
	* 3.2%, in an effort to have it be at least spa_min_slop (128MB),
	* but we never allow it to be more than half the pool size.
	*
	* Further, on very large pools, the slop space will be smaller than
	* 3.2%, to avoid reserving much more space than we actually need; bounded
	* by spa_max_slop (128GB).
	*
	* See also the comments in zfs_space_check_t.
	*/
	int spa_slop_shift = 5;
	uint64_t spa_min_slop = 128ULL * 1024 * 1024;
	uint64_t spa_max_slop = 128ULL * 1024 * 1024 * 1024;
	int spa_allocators = 4;


	/PRINTFLIKE2/
	void
	spa_load_failed(spa_t spa, const char fmt, ...)
	{
	va_list adx;
	char buf[256];

	va_start(adx, fmt);
	(void) vsnprintf(buf, sizeof (buf), fmt, adx);
	va_end(adx);

	zfs_dbgmsg("spa_load(%s, config %s): FAILED: %s", spa->spa_name,
	spa->spa_trust_config ? "trusted" : "untrusted", buf);
	}

	/PRINTFLIKE2/
	void
	spa_load_note(spa_t spa, const char fmt, ...)
	{
	va_list adx;
	char buf[256];

	va_start(adx, fmt);
	(void) vsnprintf(buf, sizeof (buf), fmt, adx);
	va_end(adx);

	zfs_dbgmsg("spa_load(%s, config %s): %s", spa->spa_name,
	spa->spa_trust_config ? "trusted" : "untrusted", buf);
	}

	/*
	* By default dedup and user data indirects land in the special class
	*/
	int zfs_ddt_data_is_special = B_TRUE;
	int zfs_user_indirect_is_special = B_TRUE;

	/*
	* The percentage of special class final space reserved for metadata only.
	* Once we allocate 100 - zfs_special_class_metadata_reserve_pct we only
	* let metadata into the class.
	*/
	int zfs_special_class_metadata_reserve_pct = 25;

	/*
	* ==========================================================================
	* SPA config locking
	* ==========================================================================
	*/
	static void
	spa_config_lock_init(spa_t *spa)
	{
	for (int i = 0; i < SCL_LOCKS; i++) {
	spa_config_lock_t *scl = &spa->spa_config_lock[i];
	mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL);
	zfs_refcount_create_untracked(&scl->scl_count);
	scl->scl_writer = NULL;
	scl->scl_write_wanted = 0;
	}
	}

	static void
	spa_config_lock_destroy(spa_t *spa)
	{
	for (int i = 0; i < SCL_LOCKS; i++) {
	spa_config_lock_t *scl = &spa->spa_config_lock[i];
	mutex_destroy(&scl->scl_lock);
	cv_destroy(&scl->scl_cv);
	zfs_refcount_destroy(&scl->scl_count);
	ASSERT(scl->scl_writer == NULL);
	ASSERT(scl->scl_write_wanted == 0);
	}
	}

	int
	spa_config_tryenter(spa_t spa, int locks, void tag, krw_t rw)
	{
	for (int i = 0; i < SCL_LOCKS; i++) {
	spa_config_lock_t *scl = &spa->spa_config_lock[i];
	if (!(locks & (1 << i)))
	continue;
	mutex_enter(&scl->scl_lock);
	if (rw == RW_READER) {
	if (scl->scl_writer \|\| scl->scl_write_wanted) {
	mutex_exit(&scl->scl_lock);
	spa_config_exit(spa, locks & ((1 << i) - 1),
	tag);
	return (0);
	}
	} else {
	ASSERT(scl->scl_writer != curthread);
	if (!zfs_refcount_is_zero(&scl->scl_count)) {
	mutex_exit(&scl->scl_lock);
	spa_config_exit(spa, locks & ((1 << i) - 1),
	tag);
	return (0);
	}
	scl->scl_writer = curthread;
	}
	(void) zfs_refcount_add(&scl->scl_count, tag);
	mutex_exit(&scl->scl_lock);
	}
	return (1);
	}

	void
	spa_config_enter(spa_t spa, int locks, const void tag, krw_t rw)
	{
	int wlocks_held = 0;

	ASSERT3U(SCL_LOCKS, <, sizeof (wlocks_held) * NBBY);

	for (int i = 0; i < SCL_LOCKS; i++) {
	spa_config_lock_t *scl = &spa->spa_config_lock[i];
	if (scl->scl_writer == curthread)
	wlocks_held \|= (1 << i);
	if (!(locks & (1 << i)))
	continue;
	mutex_enter(&scl->scl_lock);
	if (rw == RW_READER) {
	while (scl->scl_writer \|\| scl->scl_write_wanted) {
	cv_wait(&scl->scl_cv, &scl->scl_lock);
	}
	} else {
	ASSERT(scl->scl_writer != curthread);
	while (!zfs_refcount_is_zero(&scl->scl_count)) {
	scl->scl_write_wanted++;
	cv_wait(&scl->scl_cv, &scl->scl_lock);
	scl->scl_write_wanted--;
	}
	scl->scl_writer = curthread;
	}
	(void) zfs_refcount_add(&scl->scl_count, tag);
	mutex_exit(&scl->scl_lock);
	}
	ASSERT3U(wlocks_held, <=, locks);
	}

	void
	spa_config_exit(spa_t spa, int locks, const void tag)
	{
	for (int i = SCL_LOCKS - 1; i >= 0; i--) {
	spa_config_lock_t *scl = &spa->spa_config_lock[i];
	if (!(locks & (1 << i)))
	continue;
	mutex_enter(&scl->scl_lock);
	ASSERT(!zfs_refcount_is_zero(&scl->scl_count));
	if (zfs_refcount_remove(&scl->scl_count, tag) == 0) {
	ASSERT(scl->scl_writer == NULL \|\|
	scl->scl_writer == curthread);
	scl->scl_writer = NULL; /* OK in either case */
	cv_broadcast(&scl->scl_cv);
	}
	mutex_exit(&scl->scl_lock);
	}
	}

	int
	spa_config_held(spa_t *spa, int locks, krw_t rw)
	{
	int locks_held = 0;

	for (int i = 0; i < SCL_LOCKS; i++) {
	spa_config_lock_t *scl = &spa->spa_config_lock[i];
	if (!(locks & (1 << i)))
	continue;
	if ((rw == RW_READER &&
	!zfs_refcount_is_zero(&scl->scl_count)) \|\|
	(rw == RW_WRITER && scl->scl_writer == curthread))
	locks_held \|= 1 << i;
	}

	return (locks_held);
	}

	/*
	* ==========================================================================
	* SPA namespace functions
	* ==========================================================================
	*/

	/*
	* Lookup the named spa_t in the AVL tree. The spa_namespace_lock must be held.
	* Returns NULL if no matching spa_t is found.
	*/
	spa_t *
	spa_lookup(const char *name)
	{
	static spa_t search; /* spa_t is large; don't allocate on stack */
	spa_t *spa;
	avl_index_t where;
	char *cp;

	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	(void) strlcpy(search.spa_name, name, sizeof (search.spa_name));

	/*
	* If it's a full dataset name, figure out the pool name and
	* just use that.
	*/
	cp = strpbrk(search.spa_name, "/@#");
	if (cp != NULL)
	*cp = '\0';

	spa = avl_find(&spa_namespace_avl, &search, &where);

	return (spa);
	}

	/*
	* Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
	* If the zfs_deadman_enabled flag is set then it inspects all vdev queues
	* looking for potentially hung I/Os.
	*/
	void
	spa_deadman(void *arg)
	{
	spa_t *spa = arg;

	/* Disable the deadman if the pool is suspended. */
	if (spa_suspended(spa))
	return;

	zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
	(gethrtime() - spa->spa_sync_starttime) / NANOSEC,
	(u_longlong_t)++spa->spa_deadman_calls);
	if (zfs_deadman_enabled)
	vdev_deadman(spa->spa_root_vdev, FTAG);

	spa->spa_deadman_tqid = taskq_dispatch_delay(system_delay_taskq,
	spa_deadman, spa, TQ_SLEEP, ddi_get_lbolt() +
	MSEC_TO_TICK(zfs_deadman_checktime_ms));
	}

	static int
	spa_log_sm_sort_by_txg(const void va, const void vb)
	{
	const spa_log_sm_t *a = va;
	const spa_log_sm_t *b = vb;

	return (TREE_CMP(a->sls_txg, b->sls_txg));
	}

	/*
	* Create an uninitialized spa_t with the given name. Requires
	* spa_namespace_lock. The caller must ensure that the spa_t doesn't already
	* exist by calling spa_lookup() first.
	*/
	spa_t *
	spa_add(const char name, nvlist_t config, const char *altroot)
	{
	spa_t *spa;
	spa_config_dirent_t *dp;

	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP);

	mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_errlog_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_evicting_os_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_history_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_proc_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_props_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_cksum_tmpls_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_scrub_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_suspend_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_vdev_top_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_feat_stats_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_flushed_ms_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa->spa_activities_lock, NULL, MUTEX_DEFAULT, NULL);

	cv_init(&spa->spa_async_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&spa->spa_evicting_os_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&spa->spa_proc_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&spa->spa_scrub_io_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&spa->spa_suspend_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&spa->spa_activities_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&spa->spa_waiters_cv, NULL, CV_DEFAULT, NULL);

	for (int t = 0; t < TXG_SIZE; t++)
	bplist_create(&spa->spa_free_bplist[t]);

	(void) strlcpy(spa->spa_name, name, sizeof (spa->spa_name));
	spa->spa_state = POOL_STATE_UNINITIALIZED;
	spa->spa_freeze_txg = UINT64_MAX;
	spa->spa_final_txg = UINT64_MAX;
	spa->spa_load_max_txg = UINT64_MAX;
	spa->spa_proc = &p0;
	spa->spa_proc_state = SPA_PROC_NONE;
	spa->spa_trust_config = B_TRUE;
	spa->spa_hostid = zone_get_hostid(NULL);

	spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime_ms);
	spa->spa_deadman_ziotime = MSEC2NSEC(zfs_deadman_ziotime_ms);
	spa_set_deadman_failmode(spa, zfs_deadman_failmode);

	zfs_refcount_create(&spa->spa_refcount);
	spa_config_lock_init(spa);
	spa_stats_init(spa);

	avl_add(&spa_namespace_avl, spa);

	/*
	* Set the alternate root, if there is one.
	*/
	if (altroot)
	spa->spa_root = spa_strdup(altroot);

	spa->spa_alloc_count = spa_allocators;
	- spa->spa_alloc_locks = kmem_zalloc(spa->spa_alloc_count *
	- sizeof (kmutex_t), KM_SLEEP);
	- spa->spa_alloc_trees = kmem_zalloc(spa->spa_alloc_count *
	- sizeof (avl_tree_t), KM_SLEEP);
	+ spa->spa_allocs = kmem_zalloc(spa->spa_alloc_count *
	+ sizeof (spa_alloc_t), KM_SLEEP);
	for (int i = 0; i < spa->spa_alloc_count; i++) {
	- mutex_init(&spa->spa_alloc_locks[i], NULL, MUTEX_DEFAULT, NULL);
	- avl_create(&spa->spa_alloc_trees[i], zio_bookmark_compare,
	+ mutex_init(&spa->spa_allocs[i].spaa_lock, NULL, MUTEX_DEFAULT,
	+ NULL);
	+ avl_create(&spa->spa_allocs[i].spaa_tree, zio_bookmark_compare,
	sizeof (zio_t), offsetof(zio_t, io_alloc_node));
	}
	avl_create(&spa->spa_metaslabs_by_flushed, metaslab_sort_by_flushed,
	sizeof (metaslab_t), offsetof(metaslab_t, ms_spa_txg_node));
	avl_create(&spa->spa_sm_logs_by_txg, spa_log_sm_sort_by_txg,
	sizeof (spa_log_sm_t), offsetof(spa_log_sm_t, sls_node));
	list_create(&spa->spa_log_summary, sizeof (log_summary_entry_t),
	offsetof(log_summary_entry_t, lse_node));

	/*
	* Every pool starts with the default cachefile
	*/
	list_create(&spa->spa_config_list, sizeof (spa_config_dirent_t),
	offsetof(spa_config_dirent_t, scd_link));

	dp = kmem_zalloc(sizeof (spa_config_dirent_t), KM_SLEEP);
	dp->scd_path = altroot ? NULL : spa_strdup(spa_config_path);
	list_insert_head(&spa->spa_config_list, dp);

	VERIFY(nvlist_alloc(&spa->spa_load_info, NV_UNIQUE_NAME,
	KM_SLEEP) == 0);

	if (config != NULL) {
	nvlist_t *features;

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ,
	&features) == 0) {
	VERIFY(nvlist_dup(features, &spa->spa_label_features,
	0) == 0);
	}

	VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0);
	}

	if (spa->spa_label_features == NULL) {
	VERIFY(nvlist_alloc(&spa->spa_label_features, NV_UNIQUE_NAME,
	KM_SLEEP) == 0);
	}

	spa->spa_min_ashift = INT_MAX;
	spa->spa_max_ashift = 0;
	spa->spa_min_alloc = INT_MAX;

	/* Reset cached value */
	spa->spa_dedup_dspace = ~0ULL;

	/*
	* As a pool is being created, treat all features as disabled by
	* setting SPA_FEATURE_DISABLED for all entries in the feature
	* refcount cache.
	*/
	for (int i = 0; i < SPA_FEATURES; i++) {
	spa->spa_feat_refcount_cache[i] = SPA_FEATURE_DISABLED;
	}

	list_create(&spa->spa_leaf_list, sizeof (vdev_t),
	offsetof(vdev_t, vdev_leaf_node));

	return (spa);
	}

	/*
	* Removes a spa_t from the namespace, freeing up any memory used. Requires
	* spa_namespace_lock. This is called only after the spa_t has been closed and
	* deactivated.
	*/
	void
	spa_remove(spa_t *spa)
	{
	spa_config_dirent_t *dp;

	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	ASSERT(spa_state(spa) == POOL_STATE_UNINITIALIZED);
	ASSERT3U(zfs_refcount_count(&spa->spa_refcount), ==, 0);
	ASSERT0(spa->spa_waiters);

	nvlist_free(spa->spa_config_splitting);

	avl_remove(&spa_namespace_avl, spa);
	cv_broadcast(&spa_namespace_cv);

	if (spa->spa_root)
	spa_strfree(spa->spa_root);

	while ((dp = list_head(&spa->spa_config_list)) != NULL) {
	list_remove(&spa->spa_config_list, dp);
	if (dp->scd_path != NULL)
	spa_strfree(dp->scd_path);
	kmem_free(dp, sizeof (spa_config_dirent_t));
	}

	for (int i = 0; i < spa->spa_alloc_count; i++) {
	- avl_destroy(&spa->spa_alloc_trees[i]);
	- mutex_destroy(&spa->spa_alloc_locks[i]);
	+ avl_destroy(&spa->spa_allocs[i].spaa_tree);
	+ mutex_destroy(&spa->spa_allocs[i].spaa_lock);
	}
	- kmem_free(spa->spa_alloc_locks, spa->spa_alloc_count *
	- sizeof (kmutex_t));
	- kmem_free(spa->spa_alloc_trees, spa->spa_alloc_count *
	- sizeof (avl_tree_t));
	+ kmem_free(spa->spa_allocs, spa->spa_alloc_count *
	+ sizeof (spa_alloc_t));

	avl_destroy(&spa->spa_metaslabs_by_flushed);
	avl_destroy(&spa->spa_sm_logs_by_txg);
	list_destroy(&spa->spa_log_summary);
	list_destroy(&spa->spa_config_list);
	list_destroy(&spa->spa_leaf_list);

	nvlist_free(spa->spa_label_features);
	nvlist_free(spa->spa_load_info);
	nvlist_free(spa->spa_feat_stats);
	spa_config_set(spa, NULL);

	zfs_refcount_destroy(&spa->spa_refcount);

	spa_stats_destroy(spa);
	spa_config_lock_destroy(spa);

	for (int t = 0; t < TXG_SIZE; t++)
	bplist_destroy(&spa->spa_free_bplist[t]);

	zio_checksum_templates_free(spa);

	cv_destroy(&spa->spa_async_cv);
	cv_destroy(&spa->spa_evicting_os_cv);
	cv_destroy(&spa->spa_proc_cv);
	cv_destroy(&spa->spa_scrub_io_cv);
	cv_destroy(&spa->spa_suspend_cv);
	cv_destroy(&spa->spa_activities_cv);
	cv_destroy(&spa->spa_waiters_cv);

	mutex_destroy(&spa->spa_flushed_ms_lock);
	mutex_destroy(&spa->spa_async_lock);
	mutex_destroy(&spa->spa_errlist_lock);
	mutex_destroy(&spa->spa_errlog_lock);
	mutex_destroy(&spa->spa_evicting_os_lock);
	mutex_destroy(&spa->spa_history_lock);
	mutex_destroy(&spa->spa_proc_lock);
	mutex_destroy(&spa->spa_props_lock);
	mutex_destroy(&spa->spa_cksum_tmpls_lock);
	mutex_destroy(&spa->spa_scrub_lock);
	mutex_destroy(&spa->spa_suspend_lock);
	mutex_destroy(&spa->spa_vdev_top_lock);
	mutex_destroy(&spa->spa_feat_stats_lock);
	mutex_destroy(&spa->spa_activities_lock);

	kmem_free(spa, sizeof (spa_t));
	}

	/*
	* Given a pool, return the next pool in the namespace, or NULL if there is
	* none. If 'prev' is NULL, return the first pool.
	*/
	spa_t *
	spa_next(spa_t *prev)
	{
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	if (prev)
	return (AVL_NEXT(&spa_namespace_avl, prev));
	else
	return (avl_first(&spa_namespace_avl));
	}

	/*
	* ==========================================================================
	* SPA refcount functions
	* ==========================================================================
	*/

	/*
	* Add a reference to the given spa_t. Must have at least one reference, or
	* have the namespace lock held.
	*/
	void
	spa_open_ref(spa_t spa, void tag)
	{
	ASSERT(zfs_refcount_count(&spa->spa_refcount) >= spa->spa_minref \|\|
	MUTEX_HELD(&spa_namespace_lock));
	(void) zfs_refcount_add(&spa->spa_refcount, tag);
	}

	/*
	* Remove a reference to the given spa_t. Must have at least one reference, or
	* have the namespace lock held.
	*/
	void
	spa_close(spa_t spa, void tag)
	{
	ASSERT(zfs_refcount_count(&spa->spa_refcount) > spa->spa_minref \|\|
	MUTEX_HELD(&spa_namespace_lock));
	(void) zfs_refcount_remove(&spa->spa_refcount, tag);
	}

	/*
	* Remove a reference to the given spa_t held by a dsl dir that is
	* being asynchronously released. Async releases occur from a taskq
	* performing eviction of dsl datasets and dirs. The namespace lock
	* isn't held and the hold by the object being evicted may contribute to
	* spa_minref (e.g. dataset or directory released during pool export),
	* so the asserts in spa_close() do not apply.
	*/
	void
	spa_async_close(spa_t spa, void tag)
	{
	(void) zfs_refcount_remove(&spa->spa_refcount, tag);
	}

	/*
	* Check to see if the spa refcount is zero. Must be called with
	* spa_namespace_lock held. We really compare against spa_minref, which is the
	* number of references acquired when opening a pool
	*/
	boolean_t
	spa_refcount_zero(spa_t *spa)
	{
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	return (zfs_refcount_count(&spa->spa_refcount) == spa->spa_minref);
	}

	/*
	* ==========================================================================
	* SPA spare and l2cache tracking
	* ==========================================================================
	*/

	/*
	* Hot spares and cache devices are tracked using the same code below,
	* for 'auxiliary' devices.
	*/

	typedef struct spa_aux {
	uint64_t aux_guid;
	uint64_t aux_pool;
	avl_node_t aux_avl;
	int aux_count;
	} spa_aux_t;

	static inline int
	spa_aux_compare(const void a, const void b)
	{
	const spa_aux_t sa = (const spa_aux_t )a;
	const spa_aux_t sb = (const spa_aux_t )b;

	return (TREE_CMP(sa->aux_guid, sb->aux_guid));
	}

	static void
	spa_aux_add(vdev_t vd, avl_tree_t avl)
	{
	avl_index_t where;
	spa_aux_t search;
	spa_aux_t *aux;

	search.aux_guid = vd->vdev_guid;
	if ((aux = avl_find(avl, &search, &where)) != NULL) {
	aux->aux_count++;
	} else {
	aux = kmem_zalloc(sizeof (spa_aux_t), KM_SLEEP);
	aux->aux_guid = vd->vdev_guid;
	aux->aux_count = 1;
	avl_insert(avl, aux, where);
	}
	}

	static void
	spa_aux_remove(vdev_t vd, avl_tree_t avl)
	{
	spa_aux_t search;
	spa_aux_t *aux;
	avl_index_t where;

	search.aux_guid = vd->vdev_guid;
	aux = avl_find(avl, &search, &where);

	ASSERT(aux != NULL);

	if (--aux->aux_count == 0) {
	avl_remove(avl, aux);
	kmem_free(aux, sizeof (spa_aux_t));
	} else if (aux->aux_pool == spa_guid(vd->vdev_spa)) {
	aux->aux_pool = 0ULL;
	}
	}

	static boolean_t
	spa_aux_exists(uint64_t guid, uint64_t pool, int refcnt, avl_tree_t *avl)
	{
	spa_aux_t search, *found;

	search.aux_guid = guid;
	found = avl_find(avl, &search, NULL);

	if (pool) {
	if (found)
	*pool = found->aux_pool;
	else
	*pool = 0ULL;
	}

	if (refcnt) {
	if (found)
	*refcnt = found->aux_count;
	else
	*refcnt = 0;
	}

	return (found != NULL);
	}

	static void
	spa_aux_activate(vdev_t vd, avl_tree_t avl)
	{
	spa_aux_t search, *found;
	avl_index_t where;

	search.aux_guid = vd->vdev_guid;
	found = avl_find(avl, &search, &where);
	ASSERT(found != NULL);
	ASSERT(found->aux_pool == 0ULL);

	found->aux_pool = spa_guid(vd->vdev_spa);
	}

	/*
	* Spares are tracked globally due to the following constraints:
	*
	* - A spare may be part of multiple pools.
	* - A spare may be added to a pool even if it's actively in use within
	* another pool.
	* - A spare in use in any pool can only be the source of a replacement if
	* the target is a spare in the same pool.
	*
	* We keep track of all spares on the system through the use of a reference
	* counted AVL tree. When a vdev is added as a spare, or used as a replacement
	* spare, then we bump the reference count in the AVL tree. In addition, we set
	* the 'vdev_isspare' member to indicate that the device is a spare (active or
	* inactive). When a spare is made active (used to replace a device in the
	* pool), we also keep track of which pool its been made a part of.
	*
	* The 'spa_spare_lock' protects the AVL tree. These functions are normally
	* called under the spa_namespace lock as part of vdev reconfiguration. The
	* separate spare lock exists for the status query path, which does not need to
	* be completely consistent with respect to other vdev configuration changes.
	*/

	static int
	spa_spare_compare(const void a, const void b)
	{
	return (spa_aux_compare(a, b));
	}

	void
	spa_spare_add(vdev_t *vd)
	{
	mutex_enter(&spa_spare_lock);
	ASSERT(!vd->vdev_isspare);
	spa_aux_add(vd, &spa_spare_avl);
	vd->vdev_isspare = B_TRUE;
	mutex_exit(&spa_spare_lock);
	}

	void
	spa_spare_remove(vdev_t *vd)
	{
	mutex_enter(&spa_spare_lock);
	ASSERT(vd->vdev_isspare);
	spa_aux_remove(vd, &spa_spare_avl);
	vd->vdev_isspare = B_FALSE;
	mutex_exit(&spa_spare_lock);
	}

	boolean_t
	spa_spare_exists(uint64_t guid, uint64_t pool, int refcnt)
	{
	boolean_t found;

	mutex_enter(&spa_spare_lock);
	found = spa_aux_exists(guid, pool, refcnt, &spa_spare_avl);
	mutex_exit(&spa_spare_lock);

	return (found);
	}

	void
	spa_spare_activate(vdev_t *vd)
	{
	mutex_enter(&spa_spare_lock);
	ASSERT(vd->vdev_isspare);
	spa_aux_activate(vd, &spa_spare_avl);
	mutex_exit(&spa_spare_lock);
	}

	/*
	* Level 2 ARC devices are tracked globally for the same reasons as spares.
	* Cache devices currently only support one pool per cache device, and so
	* for these devices the aux reference count is currently unused beyond 1.
	*/

	static int
	spa_l2cache_compare(const void a, const void b)
	{
	return (spa_aux_compare(a, b));
	}

	void
	spa_l2cache_add(vdev_t *vd)
	{
	mutex_enter(&spa_l2cache_lock);
	ASSERT(!vd->vdev_isl2cache);
	spa_aux_add(vd, &spa_l2cache_avl);
	vd->vdev_isl2cache = B_TRUE;
	mutex_exit(&spa_l2cache_lock);
	}

	void
	spa_l2cache_remove(vdev_t *vd)
	{
	mutex_enter(&spa_l2cache_lock);
	ASSERT(vd->vdev_isl2cache);
	spa_aux_remove(vd, &spa_l2cache_avl);
	vd->vdev_isl2cache = B_FALSE;
	mutex_exit(&spa_l2cache_lock);
	}

	boolean_t
	spa_l2cache_exists(uint64_t guid, uint64_t *pool)
	{
	boolean_t found;

	mutex_enter(&spa_l2cache_lock);
	found = spa_aux_exists(guid, pool, NULL, &spa_l2cache_avl);
	mutex_exit(&spa_l2cache_lock);

	return (found);
	}

	void
	spa_l2cache_activate(vdev_t *vd)
	{
	mutex_enter(&spa_l2cache_lock);
	ASSERT(vd->vdev_isl2cache);
	spa_aux_activate(vd, &spa_l2cache_avl);
	mutex_exit(&spa_l2cache_lock);
	}

	/*
	* ==========================================================================
	* SPA vdev locking
	* ==========================================================================
	*/

	/*
	* Lock the given spa_t for the purpose of adding or removing a vdev.
	* Grabs the global spa_namespace_lock plus the spa config lock for writing.
	* It returns the next transaction group for the spa_t.
	*/
	uint64_t
	spa_vdev_enter(spa_t *spa)
	{
	mutex_enter(&spa->spa_vdev_top_lock);
	mutex_enter(&spa_namespace_lock);

	vdev_autotrim_stop_all(spa);

	return (spa_vdev_config_enter(spa));
	}

	/*
	* The same as spa_vdev_enter() above but additionally takes the guid of
	* the vdev being detached. When there is a rebuild in process it will be
	* suspended while the vdev tree is modified then resumed by spa_vdev_exit().
	* The rebuild is canceled if only a single child remains after the detach.
	*/
	uint64_t
	spa_vdev_detach_enter(spa_t *spa, uint64_t guid)
	{
	mutex_enter(&spa->spa_vdev_top_lock);
	mutex_enter(&spa_namespace_lock);

	vdev_autotrim_stop_all(spa);

	if (guid != 0) {
	vdev_t *vd = spa_lookup_by_guid(spa, guid, B_FALSE);
	if (vd) {
	vdev_rebuild_stop_wait(vd->vdev_top);
	}
	}

	return (spa_vdev_config_enter(spa));
	}

	/*
	* Internal implementation for spa_vdev_enter(). Used when a vdev
	* operation requires multiple syncs (i.e. removing a device) while
	* keeping the spa_namespace_lock held.
	*/
	uint64_t
	spa_vdev_config_enter(spa_t *spa)
	{
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	spa_config_enter(spa, SCL_ALL, spa, RW_WRITER);

	return (spa_last_synced_txg(spa) + 1);
	}

	/*
	* Used in combination with spa_vdev_config_enter() to allow the syncing
	* of multiple transactions without releasing the spa_namespace_lock.
	*/
	void
	spa_vdev_config_exit(spa_t spa, vdev_t vd, uint64_t txg, int error, char *tag)
	{
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	int config_changed = B_FALSE;

	ASSERT(txg > spa_last_synced_txg(spa));

	spa->spa_pending_vdev = NULL;

	/*
	* Reassess the DTLs.
	*/
	vdev_dtl_reassess(spa->spa_root_vdev, 0, 0, B_FALSE, B_FALSE);

	if (error == 0 && !list_is_empty(&spa->spa_config_dirty_list)) {
	config_changed = B_TRUE;
	spa->spa_config_generation++;
	}

	/*
	* Verify the metaslab classes.
	*/
	ASSERT(metaslab_class_validate(spa_normal_class(spa)) == 0);
	ASSERT(metaslab_class_validate(spa_log_class(spa)) == 0);
	ASSERT(metaslab_class_validate(spa_embedded_log_class(spa)) == 0);
	ASSERT(metaslab_class_validate(spa_special_class(spa)) == 0);
	ASSERT(metaslab_class_validate(spa_dedup_class(spa)) == 0);

	spa_config_exit(spa, SCL_ALL, spa);

	/*
	* Panic the system if the specified tag requires it. This
	* is useful for ensuring that configurations are updated
	* transactionally.
	*/
	if (zio_injection_enabled)
	zio_handle_panic_injection(spa, tag, 0);

	/*
	* Note: this txg_wait_synced() is important because it ensures
	* that there won't be more than one config change per txg.
	* This allows us to use the txg as the generation number.
	*/
	if (error == 0)
	txg_wait_synced(spa->spa_dsl_pool, txg);

	if (vd != NULL) {
	ASSERT(!vd->vdev_detached \|\| vd->vdev_dtl_sm == NULL);
	if (vd->vdev_ops->vdev_op_leaf) {
	mutex_enter(&vd->vdev_initialize_lock);
	vdev_initialize_stop(vd, VDEV_INITIALIZE_CANCELED,
	NULL);
	mutex_exit(&vd->vdev_initialize_lock);

	mutex_enter(&vd->vdev_trim_lock);
	vdev_trim_stop(vd, VDEV_TRIM_CANCELED, NULL);
	mutex_exit(&vd->vdev_trim_lock);
	}

	/*
	* The vdev may be both a leaf and top-level device.
	*/
	vdev_autotrim_stop_wait(vd);

	spa_config_enter(spa, SCL_STATE_ALL, spa, RW_WRITER);
	vdev_free(vd);
	spa_config_exit(spa, SCL_STATE_ALL, spa);
	}

	/*
	* If the config changed, update the config cache.
	*/
	if (config_changed)
	spa_write_cachefile(spa, B_FALSE, B_TRUE);
	}

	/*
	* Unlock the spa_t after adding or removing a vdev. Besides undoing the
	* locking of spa_vdev_enter(), we also want make sure the transactions have
	* synced to disk, and then update the global configuration cache with the new
	* information.
	*/
	int
	spa_vdev_exit(spa_t spa, vdev_t vd, uint64_t txg, int error)
	{
	vdev_autotrim_restart(spa);
	vdev_rebuild_restart(spa);

	spa_vdev_config_exit(spa, vd, txg, error, FTAG);
	mutex_exit(&spa_namespace_lock);
	mutex_exit(&spa->spa_vdev_top_lock);

	return (error);
	}

	/*
	* Lock the given spa_t for the purpose of changing vdev state.
	*/
	void
	spa_vdev_state_enter(spa_t *spa, int oplocks)
	{
	int locks = SCL_STATE_ALL \| oplocks;

	/*
	* Root pools may need to read of the underlying devfs filesystem
	* when opening up a vdev. Unfortunately if we're holding the
	* SCL_ZIO lock it will result in a deadlock when we try to issue
	* the read from the root filesystem. Instead we "prefetch"
	* the associated vnodes that we need prior to opening the
	* underlying devices and cache them so that we can prevent
	* any I/O when we are doing the actual open.
	*/
	if (spa_is_root(spa)) {
	int low = locks & ~(SCL_ZIO - 1);
	int high = locks & ~low;

	spa_config_enter(spa, high, spa, RW_WRITER);
	vdev_hold(spa->spa_root_vdev);
	spa_config_enter(spa, low, spa, RW_WRITER);
	} else {
	spa_config_enter(spa, locks, spa, RW_WRITER);
	}
	spa->spa_vdev_locks = locks;
	}

	int
	spa_vdev_state_exit(spa_t spa, vdev_t vd, int error)
	{
	boolean_t config_changed = B_FALSE;
	vdev_t *vdev_top;

	if (vd == NULL \|\| vd == spa->spa_root_vdev) {
	vdev_top = spa->spa_root_vdev;
	} else {
	vdev_top = vd->vdev_top;
	}

	if (vd != NULL \|\| error == 0)
	vdev_dtl_reassess(vdev_top, 0, 0, B_FALSE, B_FALSE);

	if (vd != NULL) {
	if (vd != spa->spa_root_vdev)
	vdev_state_dirty(vdev_top);

	config_changed = B_TRUE;
	spa->spa_config_generation++;
	}

	if (spa_is_root(spa))
	vdev_rele(spa->spa_root_vdev);

	ASSERT3U(spa->spa_vdev_locks, >=, SCL_STATE_ALL);
	spa_config_exit(spa, spa->spa_vdev_locks, spa);

	/*
	* If anything changed, wait for it to sync. This ensures that,
	* from the system administrator's perspective, zpool(8) commands
	* are synchronous. This is important for things like zpool offline:
	* when the command completes, you expect no further I/O from ZFS.
	*/
	if (vd != NULL)
	txg_wait_synced(spa->spa_dsl_pool, 0);

	/*
	* If the config changed, update the config cache.
	*/
	if (config_changed) {
	mutex_enter(&spa_namespace_lock);
	spa_write_cachefile(spa, B_FALSE, B_TRUE);
	mutex_exit(&spa_namespace_lock);
	}

	return (error);
	}

	/*
	* ==========================================================================
	* Miscellaneous functions
	* ==========================================================================
	*/

	void
	spa_activate_mos_feature(spa_t spa, const char feature, dmu_tx_t *tx)
	{
	if (!nvlist_exists(spa->spa_label_features, feature)) {
	fnvlist_add_boolean(spa->spa_label_features, feature);
	/*
	* When we are creating the pool (tx_txg==TXG_INITIAL), we can't
	* dirty the vdev config because lock SCL_CONFIG is not held.
	* Thankfully, in this case we don't need to dirty the config
	* because it will be written out anyway when we finish
	* creating the pool.
	*/
	if (tx->tx_txg != TXG_INITIAL)
	vdev_config_dirty(spa->spa_root_vdev);
	}
	}

	void
	spa_deactivate_mos_feature(spa_t spa, const char feature)
	{
	if (nvlist_remove_all(spa->spa_label_features, feature) == 0)
	vdev_config_dirty(spa->spa_root_vdev);
	}

	/*
	* Return the spa_t associated with given pool_guid, if it exists. If
	* device_guid is non-zero, determine whether the pool exists and contains
	* a device with the specified device_guid.
	*/
	spa_t *
	spa_by_guid(uint64_t pool_guid, uint64_t device_guid)
	{
	spa_t *spa;
	avl_tree_t *t = &spa_namespace_avl;

	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	for (spa = avl_first(t); spa != NULL; spa = AVL_NEXT(t, spa)) {
	if (spa->spa_state == POOL_STATE_UNINITIALIZED)
	continue;
	if (spa->spa_root_vdev == NULL)
	continue;
	if (spa_guid(spa) == pool_guid) {
	if (device_guid == 0)
	break;

	if (vdev_lookup_by_guid(spa->spa_root_vdev,
	device_guid) != NULL)
	break;

	/*
	* Check any devices we may be in the process of adding.
	*/
	if (spa->spa_pending_vdev) {
	if (vdev_lookup_by_guid(spa->spa_pending_vdev,
	device_guid) != NULL)
	break;
	}
	}
	}

	return (spa);
	}

	/*
	* Determine whether a pool with the given pool_guid exists.
	*/
	boolean_t
	spa_guid_exists(uint64_t pool_guid, uint64_t device_guid)
	{
	return (spa_by_guid(pool_guid, device_guid) != NULL);
	}

	char *
	spa_strdup(const char *s)
	{
	size_t len;
	char *new;

	len = strlen(s);
	new = kmem_alloc(len + 1, KM_SLEEP);
	bcopy(s, new, len);
	new[len] = '\0';

	return (new);
	}

	void
	spa_strfree(char *s)
	{
	kmem_free(s, strlen(s) + 1);
	}

	-uint64_t
	-spa_get_random(uint64_t range)
	-{
	- uint64_t r;
	-
	- ASSERT(range != 0);
	-
	- if (range == 1)
	- return (0);
	-
	- (void) random_get_pseudo_bytes((void *)&r, sizeof (uint64_t));
	-
	- return (r % range);
	-}
	-
	uint64_t
	spa_generate_guid(spa_t *spa)
	{
	- uint64_t guid = spa_get_random(-1ULL);
	+ uint64_t guid;

	if (spa != NULL) {
	- while (guid == 0 \|\| spa_guid_exists(spa_guid(spa), guid))
	- guid = spa_get_random(-1ULL);
	+ do {
	+ (void) random_get_pseudo_bytes((void *)&guid,
	+ sizeof (guid));
	+ } while (guid == 0 \|\| spa_guid_exists(spa_guid(spa), guid));
	} else {
	- while (guid == 0 \|\| spa_guid_exists(guid, 0))
	- guid = spa_get_random(-1ULL);
	+ do {
	+ (void) random_get_pseudo_bytes((void *)&guid,
	+ sizeof (guid));
	+ } while (guid == 0 \|\| spa_guid_exists(guid, 0));
	}

	return (guid);
	}

	void
	snprintf_blkptr(char buf, size_t buflen, const blkptr_t bp)
	{
	char type[256];
	char *checksum = NULL;
	char *compress = NULL;

	if (bp != NULL) {
	if (BP_GET_TYPE(bp) & DMU_OT_NEWTYPE) {
	dmu_object_byteswap_t bswap =
	DMU_OT_BYTESWAP(BP_GET_TYPE(bp));
	(void) snprintf(type, sizeof (type), "bswap %s %s",
	DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) ?
	"metadata" : "data",
	dmu_ot_byteswap[bswap].ob_name);
	} else {
	(void) strlcpy(type, dmu_ot[BP_GET_TYPE(bp)].ot_name,
	sizeof (type));
	}
	if (!BP_IS_EMBEDDED(bp)) {
	checksum =
	zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name;
	}
	compress = zio_compress_table[BP_GET_COMPRESS(bp)].ci_name;
	}

	SNPRINTF_BLKPTR(snprintf, ' ', buf, buflen, bp, type, checksum,
	compress);
	}

	void
	spa_freeze(spa_t *spa)
	{
	uint64_t freeze_txg = 0;

	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
	if (spa->spa_freeze_txg == UINT64_MAX) {
	freeze_txg = spa_last_synced_txg(spa) + TXG_SIZE;
	spa->spa_freeze_txg = freeze_txg;
	}
	spa_config_exit(spa, SCL_ALL, FTAG);
	if (freeze_txg != 0)
	txg_wait_synced(spa_get_dsl(spa), freeze_txg);
	}

	void
	zfs_panic_recover(const char *fmt, ...)
	{
	va_list adx;

	va_start(adx, fmt);
	vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
	va_end(adx);
	}

	/*
	* This is a stripped-down version of strtoull, suitable only for converting
	* lowercase hexadecimal numbers that don't overflow.
	*/
	uint64_t
	zfs_strtonum(const char str, char *nptr)
	{
	uint64_t val = 0;
	char c;
	int digit;

	while ((c = *str) != '\0') {
	if (c >= '0' && c <= '9')
	digit = c - '0';
	else if (c >= 'a' && c <= 'f')
	digit = 10 + c - 'a';
	else
	break;

	val *= 16;
	val += digit;

	str++;
	}

	if (nptr)
	nptr = (char )str;

	return (val);
	}

	void
	spa_activate_allocation_classes(spa_t spa, dmu_tx_t tx)
	{
	/*
	* We bump the feature refcount for each special vdev added to the pool
	*/
	ASSERT(spa_feature_is_enabled(spa, SPA_FEATURE_ALLOCATION_CLASSES));
	spa_feature_incr(spa, SPA_FEATURE_ALLOCATION_CLASSES, tx);
	}

	/*
	* ==========================================================================
	* Accessor functions
	* ==========================================================================
	*/

	boolean_t
	spa_shutting_down(spa_t *spa)
	{
	return (spa->spa_async_suspended);
	}

	dsl_pool_t *
	spa_get_dsl(spa_t *spa)
	{
	return (spa->spa_dsl_pool);
	}

	boolean_t
	spa_is_initializing(spa_t *spa)
	{
	return (spa->spa_is_initializing);
	}

	boolean_t
	spa_indirect_vdevs_loaded(spa_t *spa)
	{
	return (spa->spa_indirect_vdevs_loaded);
	}

	blkptr_t *
	spa_get_rootblkptr(spa_t *spa)
	{
	return (&spa->spa_ubsync.ub_rootbp);
	}

	void
	spa_set_rootblkptr(spa_t spa, const blkptr_t bp)
	{
	spa->spa_uberblock.ub_rootbp = *bp;
	}

	void
	spa_altroot(spa_t spa, char buf, size_t buflen)
	{
	if (spa->spa_root == NULL)
	buf[0] = '\0';
	else
	(void) strncpy(buf, spa->spa_root, buflen);
	}

	int
	spa_sync_pass(spa_t *spa)
	{
	return (spa->spa_sync_pass);
	}

	char *
	spa_name(spa_t *spa)
	{
	return (spa->spa_name);
	}

	uint64_t
	spa_guid(spa_t *spa)
	{
	dsl_pool_t *dp = spa_get_dsl(spa);
	uint64_t guid;

	/*
	* If we fail to parse the config during spa_load(), we can go through
	* the error path (which posts an ereport) and end up here with no root
	* vdev. We stash the original pool guid in 'spa_config_guid' to handle
	* this case.
	*/
	if (spa->spa_root_vdev == NULL)
	return (spa->spa_config_guid);

	guid = spa->spa_last_synced_guid != 0 ?
	spa->spa_last_synced_guid : spa->spa_root_vdev->vdev_guid;

	/*
	* Return the most recently synced out guid unless we're
	* in syncing context.
	*/
	if (dp && dsl_pool_sync_context(dp))
	return (spa->spa_root_vdev->vdev_guid);
	else
	return (guid);
	}

	uint64_t
	spa_load_guid(spa_t *spa)
	{
	/*
	* This is a GUID that exists solely as a reference for the
	* purposes of the arc. It is generated at load time, and
	* is never written to persistent storage.
	*/
	return (spa->spa_load_guid);
	}

	uint64_t
	spa_last_synced_txg(spa_t *spa)
	{
	return (spa->spa_ubsync.ub_txg);
	}

	uint64_t
	spa_first_txg(spa_t *spa)
	{
	return (spa->spa_first_txg);
	}

	uint64_t
	spa_syncing_txg(spa_t *spa)
	{
	return (spa->spa_syncing_txg);
	}

	/*
	* Return the last txg where data can be dirtied. The final txgs
	* will be used to just clear out any deferred frees that remain.
	*/
	uint64_t
	spa_final_dirty_txg(spa_t *spa)
	{
	return (spa->spa_final_txg - TXG_DEFER_SIZE);
	}

	pool_state_t
	spa_state(spa_t *spa)
	{
	return (spa->spa_state);
	}

	spa_load_state_t
	spa_load_state(spa_t *spa)
	{
	return (spa->spa_load_state);
	}

	uint64_t
	spa_freeze_txg(spa_t *spa)
	{
	return (spa->spa_freeze_txg);
	}

	/*
	* Return the inflated asize for a logical write in bytes. This is used by the
	* DMU to calculate the space a logical write will require on disk.
	* If lsize is smaller than the largest physical block size allocatable on this
	* pool we use its value instead, since the write will end up using the whole
	* block anyway.
	*/
	uint64_t
	spa_get_worst_case_asize(spa_t *spa, uint64_t lsize)
	{
	if (lsize == 0)
	return (0); /* No inflation needed */
	return (MAX(lsize, 1 << spa->spa_max_ashift) * spa_asize_inflation);
	}

	/*
	* Return the amount of slop space in bytes. It is typically 1/32 of the pool
	* (3.2%), minus the embedded log space. On very small pools, it may be
	* slightly larger than this. On very large pools, it will be capped to
	* the value of spa_max_slop. The embedded log space is not included in
	* spa_dspace. By subtracting it, the usable space (per "zfs list") is a
	* constant 97% of the total space, regardless of metaslab size (assuming the
	* default spa_slop_shift=5 and a non-tiny pool).
	*
	* See the comment above spa_slop_shift for more details.
	*/
	uint64_t
	spa_get_slop_space(spa_t *spa)
	{
	- uint64_t space = spa_get_dspace(spa);
	- uint64_t slop = MIN(space >> spa_slop_shift, spa_max_slop);
	+ uint64_t space = 0;
	+ uint64_t slop = 0;
	+
	+ /*
	+ * Make sure spa_dedup_dspace has been set.
	+ */
	+ if (spa->spa_dedup_dspace == ~0ULL)
	+ spa_update_dspace(spa);
	+
	+ /*
	+ * spa_get_dspace() includes the space only logically "used" by
	+ * deduplicated data, so since it's not useful to reserve more
	+ * space with more deduplicated data, we subtract that out here.
	+ */
	+ space = spa_get_dspace(spa) - spa->spa_dedup_dspace;
	+ slop = MIN(space >> spa_slop_shift, spa_max_slop);

	/*
	* Subtract the embedded log space, but no more than half the (3.2%)
	* unusable space. Note, the "no more than half" is only relevant if
	* zfs_embedded_slog_min_ms >> spa_slop_shift < 2, which is not true by
	* default.
	*/
	uint64_t embedded_log =
	metaslab_class_get_dspace(spa_embedded_log_class(spa));
	slop -= MIN(embedded_log, slop >> 1);

	/*
	* Slop space should be at least spa_min_slop, but no more than half
	* the entire pool.
	*/
	slop = MAX(slop, MIN(space >> 1, spa_min_slop));
	return (slop);
	}

	uint64_t
	spa_get_dspace(spa_t *spa)
	{
	return (spa->spa_dspace);
	}

	uint64_t
	spa_get_checkpoint_space(spa_t *spa)
	{
	return (spa->spa_checkpoint_info.sci_dspace);
	}

	void
	spa_update_dspace(spa_t *spa)
	{
	spa->spa_dspace = metaslab_class_get_dspace(spa_normal_class(spa)) +
	ddt_get_dedup_dspace(spa);
	if (spa->spa_vdev_removal != NULL) {
	/*
	* We can't allocate from the removing device, so subtract
	* its size if it was included in dspace (i.e. if this is a
	* normal-class vdev, not special/dedup). This prevents the
	* DMU/DSL from filling up the (now smaller) pool while we
	* are in the middle of removing the device.
	*
	* Note that the DMU/DSL doesn't actually know or care
	* how much space is allocated (it does its own tracking
	* of how much space has been logically used). So it
	* doesn't matter that the data we are moving may be
	* allocated twice (on the old device and the new
	* device).
	*/
	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
	vdev_t *vd =
	vdev_lookup_top(spa, spa->spa_vdev_removal->svr_vdev_id);
	- if (vd->vdev_mg->mg_class == spa_normal_class(spa)) {
	+ /*
	+ * If the stars align, we can wind up here after
	+ * vdev_remove_complete() has cleared vd->vdev_mg but before
	+ * spa->spa_vdev_removal gets cleared, so we must check before
	+ * we dereference.
	+ */
	+ if (vd->vdev_mg &&
	+ vd->vdev_mg->mg_class == spa_normal_class(spa)) {
	spa->spa_dspace -= spa_deflate(spa) ?
	vd->vdev_stat.vs_dspace : vd->vdev_stat.vs_space;
	}
	spa_config_exit(spa, SCL_VDEV, FTAG);
	}
	}

	/*
	* Return the failure mode that has been set to this pool. The default
	* behavior will be to block all I/Os when a complete failure occurs.
	*/
	uint64_t
	spa_get_failmode(spa_t *spa)
	{
	return (spa->spa_failmode);
	}

	boolean_t
	spa_suspended(spa_t *spa)
	{
	return (spa->spa_suspended != ZIO_SUSPEND_NONE);
	}

	uint64_t
	spa_version(spa_t *spa)
	{
	return (spa->spa_ubsync.ub_version);
	}

	boolean_t
	spa_deflate(spa_t *spa)
	{
	return (spa->spa_deflate);
	}

	metaslab_class_t *
	spa_normal_class(spa_t *spa)
	{
	return (spa->spa_normal_class);
	}

	metaslab_class_t *
	spa_log_class(spa_t *spa)
	{
	return (spa->spa_log_class);
	}

	metaslab_class_t *
	spa_embedded_log_class(spa_t *spa)
	{
	return (spa->spa_embedded_log_class);
	}

	metaslab_class_t *
	spa_special_class(spa_t *spa)
	{
	return (spa->spa_special_class);
	}

	metaslab_class_t *
	spa_dedup_class(spa_t *spa)
	{
	return (spa->spa_dedup_class);
	}

	/*
	* Locate an appropriate allocation class
	*/
	metaslab_class_t *
	spa_preferred_class(spa_t *spa, uint64_t size, dmu_object_type_t objtype,
	uint_t level, uint_t special_smallblk)
	{
	/*
	* ZIL allocations determine their class in zio_alloc_zil().
	*/
	ASSERT(objtype != DMU_OT_INTENT_LOG);

	boolean_t has_special_class = spa->spa_special_class->mc_groups != 0;

	if (DMU_OT_IS_DDT(objtype)) {
	if (spa->spa_dedup_class->mc_groups != 0)
	return (spa_dedup_class(spa));
	else if (has_special_class && zfs_ddt_data_is_special)
	return (spa_special_class(spa));
	else
	return (spa_normal_class(spa));
	}

	/* Indirect blocks for user data can land in special if allowed */
	if (level > 0 && (DMU_OT_IS_FILE(objtype) \|\| objtype == DMU_OT_ZVOL)) {
	if (has_special_class && zfs_user_indirect_is_special)
	return (spa_special_class(spa));
	else
	return (spa_normal_class(spa));
	}

	if (DMU_OT_IS_METADATA(objtype) \|\| level > 0) {
	if (has_special_class)
	return (spa_special_class(spa));
	else
	return (spa_normal_class(spa));
	}

	/*
	* Allow small file blocks in special class in some cases (like
	* for the dRAID vdev feature). But always leave a reserve of
	* zfs_special_class_metadata_reserve_pct exclusively for metadata.
	*/
	if (DMU_OT_IS_FILE(objtype) &&
	has_special_class && size <= special_smallblk) {
	metaslab_class_t *special = spa_special_class(spa);
	uint64_t alloc = metaslab_class_get_alloc(special);
	uint64_t space = metaslab_class_get_space(special);
	uint64_t limit =
	(space * (100 - zfs_special_class_metadata_reserve_pct))
	/ 100;

	if (alloc < limit)
	return (special);
	}

	return (spa_normal_class(spa));
	}

	void
	spa_evicting_os_register(spa_t spa, objset_t os)
	{
	mutex_enter(&spa->spa_evicting_os_lock);
	list_insert_head(&spa->spa_evicting_os_list, os);
	mutex_exit(&spa->spa_evicting_os_lock);
	}

	void
	spa_evicting_os_deregister(spa_t spa, objset_t os)
	{
	mutex_enter(&spa->spa_evicting_os_lock);
	list_remove(&spa->spa_evicting_os_list, os);
	cv_broadcast(&spa->spa_evicting_os_cv);
	mutex_exit(&spa->spa_evicting_os_lock);
	}

	void
	spa_evicting_os_wait(spa_t *spa)
	{
	mutex_enter(&spa->spa_evicting_os_lock);
	while (!list_is_empty(&spa->spa_evicting_os_list))
	cv_wait(&spa->spa_evicting_os_cv, &spa->spa_evicting_os_lock);
	mutex_exit(&spa->spa_evicting_os_lock);

	dmu_buf_user_evict_wait();
	}

	int
	spa_max_replication(spa_t *spa)
	{
	/*
	* As of SPA_VERSION == SPA_VERSION_DITTO_BLOCKS, we are able to
	* handle BPs with more than one DVA allocated. Set our max
	* replication level accordingly.
	*/
	if (spa_version(spa) < SPA_VERSION_DITTO_BLOCKS)
	return (1);
	return (MIN(SPA_DVAS_PER_BP, spa_max_replication_override));
	}

	int
	spa_prev_software_version(spa_t *spa)
	{
	return (spa->spa_prev_software_version);
	}

	uint64_t
	spa_deadman_synctime(spa_t *spa)
	{
	return (spa->spa_deadman_synctime);
	}

	spa_autotrim_t
	spa_get_autotrim(spa_t *spa)
	{
	return (spa->spa_autotrim);
	}

	uint64_t
	spa_deadman_ziotime(spa_t *spa)
	{
	return (spa->spa_deadman_ziotime);
	}

	uint64_t
	spa_get_deadman_failmode(spa_t *spa)
	{
	return (spa->spa_deadman_failmode);
	}

	void
	spa_set_deadman_failmode(spa_t spa, const char failmode)
	{
	if (strcmp(failmode, "wait") == 0)
	spa->spa_deadman_failmode = ZIO_FAILURE_MODE_WAIT;
	else if (strcmp(failmode, "continue") == 0)
	spa->spa_deadman_failmode = ZIO_FAILURE_MODE_CONTINUE;
	else if (strcmp(failmode, "panic") == 0)
	spa->spa_deadman_failmode = ZIO_FAILURE_MODE_PANIC;
	else
	spa->spa_deadman_failmode = ZIO_FAILURE_MODE_WAIT;
	}

	void
	spa_set_deadman_ziotime(hrtime_t ns)
	{
	spa_t *spa = NULL;

	if (spa_mode_global != SPA_MODE_UNINIT) {
	mutex_enter(&spa_namespace_lock);
	while ((spa = spa_next(spa)) != NULL)
	spa->spa_deadman_ziotime = ns;
	mutex_exit(&spa_namespace_lock);
	}
	}

	void
	spa_set_deadman_synctime(hrtime_t ns)
	{
	spa_t *spa = NULL;

	if (spa_mode_global != SPA_MODE_UNINIT) {
	mutex_enter(&spa_namespace_lock);
	while ((spa = spa_next(spa)) != NULL)
	spa->spa_deadman_synctime = ns;
	mutex_exit(&spa_namespace_lock);
	}
	}

	uint64_t
	dva_get_dsize_sync(spa_t spa, const dva_t dva)
	{
	uint64_t asize = DVA_GET_ASIZE(dva);
	uint64_t dsize = asize;

	ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);

	if (asize != 0 && spa->spa_deflate) {
	vdev_t *vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));
	if (vd != NULL)
	dsize = (asize >> SPA_MINBLOCKSHIFT) *
	vd->vdev_deflate_ratio;
	}

	return (dsize);
	}

	uint64_t
	bp_get_dsize_sync(spa_t spa, const blkptr_t bp)
	{
	uint64_t dsize = 0;

	for (int d = 0; d < BP_GET_NDVAS(bp); d++)
	dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);

	return (dsize);
	}

	uint64_t
	bp_get_dsize(spa_t spa, const blkptr_t bp)
	{
	uint64_t dsize = 0;

	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);

	for (int d = 0; d < BP_GET_NDVAS(bp); d++)
	dsize += dva_get_dsize_sync(spa, &bp->blk_dva[d]);

	spa_config_exit(spa, SCL_VDEV, FTAG);

	return (dsize);
	}

	uint64_t
	spa_dirty_data(spa_t *spa)
	{
	return (spa->spa_dsl_pool->dp_dirty_total);
	}

	/*
	* ==========================================================================
	* SPA Import Progress Routines
	* ==========================================================================
	*/

	typedef struct spa_import_progress {
	uint64_t pool_guid; /* unique id for updates */
	char *pool_name;
	spa_load_state_t spa_load_state;
	uint64_t mmp_sec_remaining; /* MMP activity check */
	uint64_t spa_load_max_txg; /* rewind txg */
	procfs_list_node_t smh_node;
	} spa_import_progress_t;

	spa_history_list_t *spa_import_progress_list = NULL;

	static int
	spa_import_progress_show_header(struct seq_file *f)
	{
	seq_printf(f, "%-20s %-14s %-14s %-12s %s\n", "pool_guid",
	"load_state", "multihost_secs", "max_txg",
	"pool_name");
	return (0);
	}

	static int
	spa_import_progress_show(struct seq_file f, void data)
	{
	spa_import_progress_t sip = (spa_import_progress_t )data;

	seq_printf(f, "%-20llu %-14llu %-14llu %-12llu %s\n",
	(u_longlong_t)sip->pool_guid, (u_longlong_t)sip->spa_load_state,
	(u_longlong_t)sip->mmp_sec_remaining,
	(u_longlong_t)sip->spa_load_max_txg,
	(sip->pool_name ? sip->pool_name : "-"));

	return (0);
	}

	/* Remove oldest elements from list until there are no more than 'size' left */
	static void
	spa_import_progress_truncate(spa_history_list_t *shl, unsigned int size)
	{
	spa_import_progress_t *sip;
	while (shl->size > size) {
	sip = list_remove_head(&shl->procfs_list.pl_list);
	if (sip->pool_name)
	spa_strfree(sip->pool_name);
	kmem_free(sip, sizeof (spa_import_progress_t));
	shl->size--;
	}

	IMPLY(size == 0, list_is_empty(&shl->procfs_list.pl_list));
	}

	static void
	spa_import_progress_init(void)
	{
	spa_import_progress_list = kmem_zalloc(sizeof (spa_history_list_t),
	KM_SLEEP);

	spa_import_progress_list->size = 0;

	spa_import_progress_list->procfs_list.pl_private =
	spa_import_progress_list;

	procfs_list_install("zfs",
	NULL,
	"import_progress",
	0644,
	&spa_import_progress_list->procfs_list,
	spa_import_progress_show,
	spa_import_progress_show_header,
	NULL,
	offsetof(spa_import_progress_t, smh_node));
	}

	static void
	spa_import_progress_destroy(void)
	{
	spa_history_list_t *shl = spa_import_progress_list;
	procfs_list_uninstall(&shl->procfs_list);
	spa_import_progress_truncate(shl, 0);
	procfs_list_destroy(&shl->procfs_list);
	kmem_free(shl, sizeof (spa_history_list_t));
	}

	int
	spa_import_progress_set_state(uint64_t pool_guid,
	spa_load_state_t load_state)
	{
	spa_history_list_t *shl = spa_import_progress_list;
	spa_import_progress_t *sip;
	int error = ENOENT;

	if (shl->size == 0)
	return (0);

	mutex_enter(&shl->procfs_list.pl_lock);
	for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
	sip = list_prev(&shl->procfs_list.pl_list, sip)) {
	if (sip->pool_guid == pool_guid) {
	sip->spa_load_state = load_state;
	error = 0;
	break;
	}
	}
	mutex_exit(&shl->procfs_list.pl_lock);

	return (error);
	}

	int
	spa_import_progress_set_max_txg(uint64_t pool_guid, uint64_t load_max_txg)
	{
	spa_history_list_t *shl = spa_import_progress_list;
	spa_import_progress_t *sip;
	int error = ENOENT;

	if (shl->size == 0)
	return (0);

	mutex_enter(&shl->procfs_list.pl_lock);
	for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
	sip = list_prev(&shl->procfs_list.pl_list, sip)) {
	if (sip->pool_guid == pool_guid) {
	sip->spa_load_max_txg = load_max_txg;
	error = 0;
	break;
	}
	}
	mutex_exit(&shl->procfs_list.pl_lock);

	return (error);
	}

	int
	spa_import_progress_set_mmp_check(uint64_t pool_guid,
	uint64_t mmp_sec_remaining)
	{
	spa_history_list_t *shl = spa_import_progress_list;
	spa_import_progress_t *sip;
	int error = ENOENT;

	if (shl->size == 0)
	return (0);

	mutex_enter(&shl->procfs_list.pl_lock);
	for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
	sip = list_prev(&shl->procfs_list.pl_list, sip)) {
	if (sip->pool_guid == pool_guid) {
	sip->mmp_sec_remaining = mmp_sec_remaining;
	error = 0;
	break;
	}
	}
	mutex_exit(&shl->procfs_list.pl_lock);

	return (error);
	}

	/*
	* A new import is in progress, add an entry.
	*/
	void
	spa_import_progress_add(spa_t *spa)
	{
	spa_history_list_t *shl = spa_import_progress_list;
	spa_import_progress_t *sip;
	char *poolname = NULL;

	sip = kmem_zalloc(sizeof (spa_import_progress_t), KM_SLEEP);
	sip->pool_guid = spa_guid(spa);

	(void) nvlist_lookup_string(spa->spa_config, ZPOOL_CONFIG_POOL_NAME,
	&poolname);
	if (poolname == NULL)
	poolname = spa_name(spa);
	sip->pool_name = spa_strdup(poolname);
	sip->spa_load_state = spa_load_state(spa);

	mutex_enter(&shl->procfs_list.pl_lock);
	procfs_list_add(&shl->procfs_list, sip);
	shl->size++;
	mutex_exit(&shl->procfs_list.pl_lock);
	}

	void
	spa_import_progress_remove(uint64_t pool_guid)
	{
	spa_history_list_t *shl = spa_import_progress_list;
	spa_import_progress_t *sip;

	mutex_enter(&shl->procfs_list.pl_lock);
	for (sip = list_tail(&shl->procfs_list.pl_list); sip != NULL;
	sip = list_prev(&shl->procfs_list.pl_list, sip)) {
	if (sip->pool_guid == pool_guid) {
	if (sip->pool_name)
	spa_strfree(sip->pool_name);
	list_remove(&shl->procfs_list.pl_list, sip);
	shl->size--;
	kmem_free(sip, sizeof (spa_import_progress_t));
	break;
	}
	}
	mutex_exit(&shl->procfs_list.pl_lock);
	}

	/*
	* ==========================================================================
	* Initialization and Termination
	* ==========================================================================
	*/

	static int
	spa_name_compare(const void a1, const void a2)
	{
	const spa_t *s1 = a1;
	const spa_t *s2 = a2;
	int s;

	s = strcmp(s1->spa_name, s2->spa_name);

	return (TREE_ISIGN(s));
	}

	void
	spa_boot_init(void)
	{
	spa_config_load();
	}

	void
	spa_init(spa_mode_t mode)
	{
	mutex_init(&spa_namespace_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa_spare_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&spa_l2cache_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&spa_namespace_cv, NULL, CV_DEFAULT, NULL);

	avl_create(&spa_namespace_avl, spa_name_compare, sizeof (spa_t),
	offsetof(spa_t, spa_avl));

	avl_create(&spa_spare_avl, spa_spare_compare, sizeof (spa_aux_t),
	offsetof(spa_aux_t, aux_avl));

	avl_create(&spa_l2cache_avl, spa_l2cache_compare, sizeof (spa_aux_t),
	offsetof(spa_aux_t, aux_avl));

	spa_mode_global = mode;

	#ifndef _KERNEL
	if (spa_mode_global != SPA_MODE_READ && dprintf_find_string("watch")) {
	struct sigaction sa;

	sa.sa_flags = SA_SIGINFO;
	sigemptyset(&sa.sa_mask);
	sa.sa_sigaction = arc_buf_sigsegv;

	if (sigaction(SIGSEGV, &sa, NULL) == -1) {
	perror("could not enable watchpoints: "
	"sigaction(SIGSEGV, ...) = ");
	} else {
	arc_watch = B_TRUE;
	}
	}
	#endif

	fm_init();
	zfs_refcount_init();
	unique_init();
	zfs_btree_init();
	metaslab_stat_init();
	ddt_init();
	zio_init();
	dmu_init();
	zil_init();
	vdev_cache_stat_init();
	vdev_mirror_stat_init();
	vdev_raidz_math_init();
	vdev_file_init();
	zfs_prop_init();
	zpool_prop_init();
	zpool_feature_init();
	spa_config_load();
	l2arc_start();
	scan_init();
	qat_init();
	spa_import_progress_init();
	}

	void
	spa_fini(void)
	{
	l2arc_stop();

	spa_evict_all();

	vdev_file_fini();
	vdev_cache_stat_fini();
	vdev_mirror_stat_fini();
	vdev_raidz_math_fini();
	zil_fini();
	dmu_fini();
	zio_fini();
	ddt_fini();
	metaslab_stat_fini();
	zfs_btree_fini();
	unique_fini();
	zfs_refcount_fini();
	fm_fini();
	scan_fini();
	qat_fini();
	spa_import_progress_destroy();

	avl_destroy(&spa_namespace_avl);
	avl_destroy(&spa_spare_avl);
	avl_destroy(&spa_l2cache_avl);

	cv_destroy(&spa_namespace_cv);
	mutex_destroy(&spa_namespace_lock);
	mutex_destroy(&spa_spare_lock);
	mutex_destroy(&spa_l2cache_lock);
	}

	/*
	* Return whether this pool has a dedicated slog device. No locking needed.
	* It's not a problem if the wrong answer is returned as it's only for
	* performance and not correctness.
	*/
	boolean_t
	spa_has_slogs(spa_t *spa)
	{
	return (spa->spa_log_class->mc_groups != 0);
	}

	spa_log_state_t
	spa_get_log_state(spa_t *spa)
	{
	return (spa->spa_log_state);
	}

	void
	spa_set_log_state(spa_t *spa, spa_log_state_t state)
	{
	spa->spa_log_state = state;
	}

	boolean_t
	spa_is_root(spa_t *spa)
	{
	return (spa->spa_is_root);
	}

	boolean_t
	spa_writeable(spa_t *spa)
	{
	return (!!(spa->spa_mode & SPA_MODE_WRITE) && spa->spa_trust_config);
	}

	/*
	* Returns true if there is a pending sync task in any of the current
	* syncing txg, the current quiescing txg, or the current open txg.
	*/
	boolean_t
	spa_has_pending_synctask(spa_t *spa)
	{
	return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks) \|\|
	!txg_all_lists_empty(&spa->spa_dsl_pool->dp_early_sync_tasks));
	}

	spa_mode_t
	spa_mode(spa_t *spa)
	{
	return (spa->spa_mode);
	}

	uint64_t
	spa_bootfs(spa_t *spa)
	{
	return (spa->spa_bootfs);
	}

	uint64_t
	spa_delegation(spa_t *spa)
	{
	return (spa->spa_delegation);
	}

	objset_t *
	spa_meta_objset(spa_t *spa)
	{
	return (spa->spa_meta_objset);
	}

	enum zio_checksum
	spa_dedup_checksum(spa_t *spa)
	{
	return (spa->spa_dedup_checksum);
	}

	/*
	* Reset pool scan stat per scan pass (or reboot).
	*/
	void
	spa_scan_stat_init(spa_t *spa)
	{
	/* data not stored on disk */
	spa->spa_scan_pass_start = gethrestime_sec();
	if (dsl_scan_is_paused_scrub(spa->spa_dsl_pool->dp_scan))
	spa->spa_scan_pass_scrub_pause = spa->spa_scan_pass_start;
	else
	spa->spa_scan_pass_scrub_pause = 0;
	spa->spa_scan_pass_scrub_spent_paused = 0;
	spa->spa_scan_pass_exam = 0;
	spa->spa_scan_pass_issued = 0;
	vdev_scan_stat_init(spa->spa_root_vdev);
	}

	/*
	* Get scan stats for zpool status reports
	*/
	int
	spa_scan_get_stats(spa_t spa, pool_scan_stat_t ps)
	{
	dsl_scan_t *scn = spa->spa_dsl_pool ? spa->spa_dsl_pool->dp_scan : NULL;

	if (scn == NULL \|\| scn->scn_phys.scn_func == POOL_SCAN_NONE)
	return (SET_ERROR(ENOENT));
	bzero(ps, sizeof (pool_scan_stat_t));

	/* data stored on disk */
	ps->pss_func = scn->scn_phys.scn_func;
	ps->pss_state = scn->scn_phys.scn_state;
	ps->pss_start_time = scn->scn_phys.scn_start_time;
	ps->pss_end_time = scn->scn_phys.scn_end_time;
	ps->pss_to_examine = scn->scn_phys.scn_to_examine;
	ps->pss_examined = scn->scn_phys.scn_examined;
	ps->pss_to_process = scn->scn_phys.scn_to_process;
	ps->pss_processed = scn->scn_phys.scn_processed;
	ps->pss_errors = scn->scn_phys.scn_errors;

	/* data not stored on disk */
	ps->pss_pass_exam = spa->spa_scan_pass_exam;
	ps->pss_pass_start = spa->spa_scan_pass_start;
	ps->pss_pass_scrub_pause = spa->spa_scan_pass_scrub_pause;
	ps->pss_pass_scrub_spent_paused = spa->spa_scan_pass_scrub_spent_paused;
	ps->pss_pass_issued = spa->spa_scan_pass_issued;
	ps->pss_issued =
	scn->scn_issued_before_pass + spa->spa_scan_pass_issued;

	return (0);
	}

	int
	spa_maxblocksize(spa_t *spa)
	{
	if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS))
	return (SPA_MAXBLOCKSIZE);
	else
	return (SPA_OLD_MAXBLOCKSIZE);
	}


	/*
	* Returns the txg that the last device removal completed. No indirect mappings
	* have been added since this txg.
	*/
	uint64_t
	spa_get_last_removal_txg(spa_t *spa)
	{
	uint64_t vdevid;
	uint64_t ret = -1ULL;

	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
	/*
	* sr_prev_indirect_vdev is only modified while holding all the
	* config locks, so it is sufficient to hold SCL_VDEV as reader when
	* examining it.
	*/
	vdevid = spa->spa_removing_phys.sr_prev_indirect_vdev;

	while (vdevid != -1ULL) {
	vdev_t *vd = vdev_lookup_top(spa, vdevid);
	vdev_indirect_births_t *vib = vd->vdev_indirect_births;

	ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);

	/*
	* If the removal did not remap any data, we don't care.
	*/
	if (vdev_indirect_births_count(vib) != 0) {
	ret = vdev_indirect_births_last_entry_txg(vib);
	break;
	}

	vdevid = vd->vdev_indirect_config.vic_prev_indirect_vdev;
	}
	spa_config_exit(spa, SCL_VDEV, FTAG);

	IMPLY(ret != -1ULL,
	spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL));

	return (ret);
	}

	int
	spa_maxdnodesize(spa_t *spa)
	{
	if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_DNODE))
	return (DNODE_MAX_SIZE);
	else
	return (DNODE_MIN_SIZE);
	}

	boolean_t
	spa_multihost(spa_t *spa)
	{
	return (spa->spa_multihost ? B_TRUE : B_FALSE);
	}

	uint32_t
	spa_get_hostid(spa_t *spa)
	{
	return (spa->spa_hostid);
	}

	boolean_t
	spa_trust_config(spa_t *spa)
	{
	return (spa->spa_trust_config);
	}

	uint64_t
	spa_missing_tvds_allowed(spa_t *spa)
	{
	return (spa->spa_missing_tvds_allowed);
	}

	space_map_t *
	spa_syncing_log_sm(spa_t *spa)
	{
	return (spa->spa_syncing_log_sm);
	}

	void
	spa_set_missing_tvds(spa_t *spa, uint64_t missing)
	{
	spa->spa_missing_tvds = missing;
	}

	/*
	* Return the pool state string ("ONLINE", "DEGRADED", "SUSPENDED", etc).
	*/
	const char *
	spa_state_to_name(spa_t *spa)
	{
	ASSERT3P(spa, !=, NULL);

	/*
	* it is possible for the spa to exist, without root vdev
	* as the spa transitions during import/export
	*/
	vdev_t *rvd = spa->spa_root_vdev;
	if (rvd == NULL) {
	return ("TRANSITIONING");
	}
	vdev_state_t state = rvd->vdev_state;
	vdev_aux_t aux = rvd->vdev_stat.vs_aux;

	if (spa_suspended(spa) &&
	(spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE))
	return ("SUSPENDED");

	switch (state) {
	case VDEV_STATE_CLOSED:
	case VDEV_STATE_OFFLINE:
	return ("OFFLINE");
	case VDEV_STATE_REMOVED:
	return ("REMOVED");
	case VDEV_STATE_CANT_OPEN:
	if (aux == VDEV_AUX_CORRUPT_DATA \|\| aux == VDEV_AUX_BAD_LOG)
	return ("FAULTED");
	else if (aux == VDEV_AUX_SPLIT_POOL)
	return ("SPLIT");
	else
	return ("UNAVAIL");
	case VDEV_STATE_FAULTED:
	return ("FAULTED");
	case VDEV_STATE_DEGRADED:
	return ("DEGRADED");
	case VDEV_STATE_HEALTHY:
	return ("ONLINE");
	default:
	break;
	}

	return ("UNKNOWN");
	}

	boolean_t
	spa_top_vdevs_spacemap_addressable(spa_t *spa)
	{
	vdev_t *rvd = spa->spa_root_vdev;
	for (uint64_t c = 0; c < rvd->vdev_children; c++) {
	if (!vdev_is_spacemap_addressable(rvd->vdev_child[c]))
	return (B_FALSE);
	}
	return (B_TRUE);
	}

	boolean_t
	spa_has_checkpoint(spa_t *spa)
	{
	return (spa->spa_checkpoint_txg != 0);
	}

	boolean_t
	spa_importing_readonly_checkpoint(spa_t *spa)
	{
	return ((spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT) &&
	spa->spa_mode == SPA_MODE_READ);
	}

	uint64_t
	spa_min_claim_txg(spa_t *spa)
	{
	uint64_t checkpoint_txg = spa->spa_uberblock.ub_checkpoint_txg;

	if (checkpoint_txg != 0)
	return (checkpoint_txg + 1);

	return (spa->spa_first_txg);
	}

	/*
	* If there is a checkpoint, async destroys may consume more space from
	* the pool instead of freeing it. In an attempt to save the pool from
	* getting suspended when it is about to run out of space, we stop
	* processing async destroys.
	*/
	boolean_t
	spa_suspend_async_destroy(spa_t *spa)
	{
	dsl_pool_t *dp = spa_get_dsl(spa);

	uint64_t unreserved = dsl_pool_unreserved_space(dp,
	ZFS_SPACE_CHECK_EXTRA_RESERVED);
	uint64_t used = dsl_dir_phys(dp->dp_root_dir)->dd_used_bytes;
	uint64_t avail = (unreserved > used) ? (unreserved - used) : 0;

	if (spa_has_checkpoint(spa) && avail == 0)
	return (B_TRUE);

	return (B_FALSE);
	}

	#if defined(_KERNEL)

	int
	param_set_deadman_failmode_common(const char *val)
	{
	spa_t *spa = NULL;
	char *p;

	if (val == NULL)
	return (SET_ERROR(EINVAL));

	if ((p = strchr(val, '\n')) != NULL)
	*p = '\0';

	if (strcmp(val, "wait") != 0 && strcmp(val, "continue") != 0 &&
	strcmp(val, "panic"))
	return (SET_ERROR(EINVAL));

	if (spa_mode_global != SPA_MODE_UNINIT) {
	mutex_enter(&spa_namespace_lock);
	while ((spa = spa_next(spa)) != NULL)
	spa_set_deadman_failmode(spa, val);
	mutex_exit(&spa_namespace_lock);
	}

	return (0);
	}
	#endif

	/* Namespace manipulation */
	EXPORT_SYMBOL(spa_lookup);
	EXPORT_SYMBOL(spa_add);
	EXPORT_SYMBOL(spa_remove);
	EXPORT_SYMBOL(spa_next);

	/* Refcount functions */
	EXPORT_SYMBOL(spa_open_ref);
	EXPORT_SYMBOL(spa_close);
	EXPORT_SYMBOL(spa_refcount_zero);

	/* Pool configuration lock */
	EXPORT_SYMBOL(spa_config_tryenter);
	EXPORT_SYMBOL(spa_config_enter);
	EXPORT_SYMBOL(spa_config_exit);
	EXPORT_SYMBOL(spa_config_held);

	/* Pool vdev add/remove lock */
	EXPORT_SYMBOL(spa_vdev_enter);
	EXPORT_SYMBOL(spa_vdev_exit);

	/* Pool vdev state change lock */
	EXPORT_SYMBOL(spa_vdev_state_enter);
	EXPORT_SYMBOL(spa_vdev_state_exit);

	/* Accessor functions */
	EXPORT_SYMBOL(spa_shutting_down);
	EXPORT_SYMBOL(spa_get_dsl);
	EXPORT_SYMBOL(spa_get_rootblkptr);
	EXPORT_SYMBOL(spa_set_rootblkptr);
	EXPORT_SYMBOL(spa_altroot);
	EXPORT_SYMBOL(spa_sync_pass);
	EXPORT_SYMBOL(spa_name);
	EXPORT_SYMBOL(spa_guid);
	EXPORT_SYMBOL(spa_last_synced_txg);
	EXPORT_SYMBOL(spa_first_txg);
	EXPORT_SYMBOL(spa_syncing_txg);
	EXPORT_SYMBOL(spa_version);
	EXPORT_SYMBOL(spa_state);
	EXPORT_SYMBOL(spa_load_state);
	EXPORT_SYMBOL(spa_freeze_txg);
	EXPORT_SYMBOL(spa_get_dspace);
	EXPORT_SYMBOL(spa_update_dspace);
	EXPORT_SYMBOL(spa_deflate);
	EXPORT_SYMBOL(spa_normal_class);
	EXPORT_SYMBOL(spa_log_class);
	EXPORT_SYMBOL(spa_special_class);
	EXPORT_SYMBOL(spa_preferred_class);
	EXPORT_SYMBOL(spa_max_replication);
	EXPORT_SYMBOL(spa_prev_software_version);
	EXPORT_SYMBOL(spa_get_failmode);
	EXPORT_SYMBOL(spa_suspended);
	EXPORT_SYMBOL(spa_bootfs);
	EXPORT_SYMBOL(spa_delegation);
	EXPORT_SYMBOL(spa_meta_objset);
	EXPORT_SYMBOL(spa_maxblocksize);
	EXPORT_SYMBOL(spa_maxdnodesize);

	/* Miscellaneous support routines */
	EXPORT_SYMBOL(spa_guid_exists);
	EXPORT_SYMBOL(spa_strdup);
	EXPORT_SYMBOL(spa_strfree);
	-EXPORT_SYMBOL(spa_get_random);
	EXPORT_SYMBOL(spa_generate_guid);
	EXPORT_SYMBOL(snprintf_blkptr);
	EXPORT_SYMBOL(spa_freeze);
	EXPORT_SYMBOL(spa_upgrade);
	EXPORT_SYMBOL(spa_evict_all);
	EXPORT_SYMBOL(spa_lookup_by_guid);
	EXPORT_SYMBOL(spa_has_spare);
	EXPORT_SYMBOL(dva_get_dsize_sync);
	EXPORT_SYMBOL(bp_get_dsize_sync);
	EXPORT_SYMBOL(bp_get_dsize);
	EXPORT_SYMBOL(spa_has_slogs);
	EXPORT_SYMBOL(spa_is_root);
	EXPORT_SYMBOL(spa_writeable);
	EXPORT_SYMBOL(spa_mode);
	EXPORT_SYMBOL(spa_namespace_lock);
	EXPORT_SYMBOL(spa_trust_config);
	EXPORT_SYMBOL(spa_missing_tvds_allowed);
	EXPORT_SYMBOL(spa_set_missing_tvds);
	EXPORT_SYMBOL(spa_state_to_name);
	EXPORT_SYMBOL(spa_importing_readonly_checkpoint);
	EXPORT_SYMBOL(spa_min_claim_txg);
	EXPORT_SYMBOL(spa_suspend_async_destroy);
	EXPORT_SYMBOL(spa_has_checkpoint);
	EXPORT_SYMBOL(spa_top_vdevs_spacemap_addressable);

	ZFS_MODULE_PARAM(zfs, zfs_, flags, UINT, ZMOD_RW,
	"Set additional debugging flags");

	ZFS_MODULE_PARAM(zfs, zfs_, recover, INT, ZMOD_RW,
	"Set to attempt to recover from fatal errors");

	ZFS_MODULE_PARAM(zfs, zfs_, free_leak_on_eio, INT, ZMOD_RW,
	"Set to ignore IO errors during free and permanently leak the space");

	ZFS_MODULE_PARAM(zfs_deadman, zfs_deadman_, checktime_ms, ULONG, ZMOD_RW,
	"Dead I/O check interval in milliseconds");

	ZFS_MODULE_PARAM(zfs_deadman, zfs_deadman_, enabled, INT, ZMOD_RW,
	"Enable deadman timer");

	ZFS_MODULE_PARAM(zfs_spa, spa_, asize_inflation, INT, ZMOD_RW,
	"SPA size estimate multiplication factor");

	ZFS_MODULE_PARAM(zfs, zfs_, ddt_data_is_special, INT, ZMOD_RW,
	"Place DDT data into the special class");

	ZFS_MODULE_PARAM(zfs, zfs_, user_indirect_is_special, INT, ZMOD_RW,
	"Place user data indirect blocks into the special class");

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM_CALL(zfs_deadman, zfs_deadman_, failmode,
	param_set_deadman_failmode, param_get_charp, ZMOD_RW,
	"Failmode for deadman timer");

	ZFS_MODULE_PARAM_CALL(zfs_deadman, zfs_deadman_, synctime_ms,
	param_set_deadman_synctime, param_get_ulong, ZMOD_RW,
	"Pool sync expiration time in milliseconds");

	ZFS_MODULE_PARAM_CALL(zfs_deadman, zfs_deadman_, ziotime_ms,
	param_set_deadman_ziotime, param_get_ulong, ZMOD_RW,
	"IO expiration time in milliseconds");

	ZFS_MODULE_PARAM(zfs, zfs_, special_class_metadata_reserve_pct, INT, ZMOD_RW,
	"Small file blocks in special vdevs depends on this much "
	"free space available");
	/* END CSTYLED */

	ZFS_MODULE_PARAM_CALL(zfs_spa, spa_, slop_shift, param_set_slop_shift,
	param_get_int, ZMOD_RW, "Reserved free space in pool");
	diff --git a/sys/contrib/openzfs/module/zfs/space_map.c b/sys/contrib/openzfs/module/zfs/space_map.c
	index 138e6c75ed9b..11d4798925e4 100644
	--- a/sys/contrib/openzfs/module/zfs/space_map.c
	+++ b/sys/contrib/openzfs/module/zfs/space_map.c
	@@ -1,1107 +1,1107 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/
	/*
	* Copyright (c) 2012, 2019 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/dmu.h>
	#include <sys/dmu_tx.h>
	#include <sys/dnode.h>
	#include <sys/dsl_pool.h>
	#include <sys/zio.h>
	#include <sys/space_map.h>
	#include <sys/zfeature.h>

	/*
	* Note on space map block size:
	*
	* The data for a given space map can be kept on blocks of any size.
	* Larger blocks entail fewer I/O operations, but they also cause the
	* DMU to keep more data in-core, and also to waste more I/O bandwidth
	* when only a few blocks have changed since the last transaction group.
	*/

	/*
	* Enabled whenever we want to stress test the use of double-word
	* space map entries.
	*/
	boolean_t zfs_force_some_double_word_sm_entries = B_FALSE;

	/*
	* Override the default indirect block size of 128K, instead use 16K for
	* spacemaps (2^14 bytes). This dramatically reduces write inflation since
	* appending to a spacemap typically has to write one data block (4KB) and one
	* or two indirect blocks (16K-32K, rather than 128K).
	*/
	int space_map_ibs = 14;

	boolean_t
	sm_entry_is_debug(uint64_t e)
	{
	return (SM_PREFIX_DECODE(e) == SM_DEBUG_PREFIX);
	}

	boolean_t
	sm_entry_is_single_word(uint64_t e)
	{
	uint8_t prefix = SM_PREFIX_DECODE(e);
	return (prefix != SM_DEBUG_PREFIX && prefix != SM2_PREFIX);
	}

	boolean_t
	sm_entry_is_double_word(uint64_t e)
	{
	return (SM_PREFIX_DECODE(e) == SM2_PREFIX);
	}

	/*
	* Iterate through the space map, invoking the callback on each (non-debug)
	* space map entry. Stop after reading 'end' bytes of the space map.
	*/
	int
	space_map_iterate(space_map_t sm, uint64_t end, sm_cb_t callback, void arg)
	{
	uint64_t blksz = sm->sm_blksz;

	ASSERT3U(blksz, !=, 0);
	ASSERT3U(end, <=, space_map_length(sm));
	ASSERT0(P2PHASE(end, sizeof (uint64_t)));

	dmu_prefetch(sm->sm_os, space_map_object(sm), 0, 0, end,
	ZIO_PRIORITY_SYNC_READ);

	int error = 0;
	uint64_t txg = 0, sync_pass = 0;
	for (uint64_t block_base = 0; block_base < end && error == 0;
	block_base += blksz) {
	dmu_buf_t *db;
	error = dmu_buf_hold(sm->sm_os, space_map_object(sm),
	block_base, FTAG, &db, DMU_READ_PREFETCH);
	if (error != 0)
	return (error);

	uint64_t *block_start = db->db_data;
	uint64_t block_length = MIN(end - block_base, blksz);
	uint64_t *block_end = block_start +
	(block_length / sizeof (uint64_t));

	VERIFY0(P2PHASE(block_length, sizeof (uint64_t)));
	VERIFY3U(block_length, !=, 0);
	ASSERT3U(blksz, ==, db->db_size);

	for (uint64_t *block_cursor = block_start;
	block_cursor < block_end && error == 0; block_cursor++) {
	uint64_t e = *block_cursor;

	if (sm_entry_is_debug(e)) {
	/*
	* Debug entries are only needed to record the
	* current TXG and sync pass if available.
	*
	* Note though that sometimes there can be
	* debug entries that are used as padding
	* at the end of space map blocks in-order
	* to not split a double-word entry in the
	* middle between two blocks. These entries
	* have their TXG field set to 0 and we
	* skip them without recording the TXG.
	* [see comment in space_map_write_seg()]
	*/
	uint64_t e_txg = SM_DEBUG_TXG_DECODE(e);
	if (e_txg != 0) {
	txg = e_txg;
	sync_pass = SM_DEBUG_SYNCPASS_DECODE(e);
	} else {
	ASSERT0(SM_DEBUG_SYNCPASS_DECODE(e));
	}
	continue;
	}

	uint64_t raw_offset, raw_run, vdev_id;
	maptype_t type;
	if (sm_entry_is_single_word(e)) {
	type = SM_TYPE_DECODE(e);
	vdev_id = SM_NO_VDEVID;
	raw_offset = SM_OFFSET_DECODE(e);
	raw_run = SM_RUN_DECODE(e);
	} else {
	/* it is a two-word entry */
	ASSERT(sm_entry_is_double_word(e));
	raw_run = SM2_RUN_DECODE(e);
	vdev_id = SM2_VDEV_DECODE(e);

	/* move on to the second word */
	block_cursor++;
	e = *block_cursor;
	VERIFY3P(block_cursor, <=, block_end);

	type = SM2_TYPE_DECODE(e);
	raw_offset = SM2_OFFSET_DECODE(e);
	}

	uint64_t entry_offset = (raw_offset << sm->sm_shift) +
	sm->sm_start;
	uint64_t entry_run = raw_run << sm->sm_shift;

	VERIFY0(P2PHASE(entry_offset, 1ULL << sm->sm_shift));
	VERIFY0(P2PHASE(entry_run, 1ULL << sm->sm_shift));
	ASSERT3U(entry_offset, >=, sm->sm_start);
	ASSERT3U(entry_offset, <, sm->sm_start + sm->sm_size);
	ASSERT3U(entry_run, <=, sm->sm_size);
	ASSERT3U(entry_offset + entry_run, <=,
	sm->sm_start + sm->sm_size);

	space_map_entry_t sme = {
	.sme_type = type,
	.sme_vdev = vdev_id,
	.sme_offset = entry_offset,
	.sme_run = entry_run,
	.sme_txg = txg,
	.sme_sync_pass = sync_pass
	};
	error = callback(&sme, arg);
	}
	dmu_buf_rele(db, FTAG);
	}
	return (error);
	}

	/*
	* Reads the entries from the last block of the space map into
	* buf in reverse order. Populates nwords with number of words
	* in the last block.
	*
	* Refer to block comment within space_map_incremental_destroy()
	* to understand why this function is needed.
	*/
	static int
	space_map_reversed_last_block_entries(space_map_t sm, uint64_t buf,
	uint64_t bufsz, uint64_t *nwords)
	{
	int error = 0;
	dmu_buf_t *db;

	/*
	* Find the offset of the last word in the space map and use
	* that to read the last block of the space map with
	* dmu_buf_hold().
	*/
	uint64_t last_word_offset =
	sm->sm_phys->smp_length - sizeof (uint64_t);
	error = dmu_buf_hold(sm->sm_os, space_map_object(sm), last_word_offset,
	FTAG, &db, DMU_READ_NO_PREFETCH);
	if (error != 0)
	return (error);

	ASSERT3U(sm->sm_object, ==, db->db_object);
	ASSERT3U(sm->sm_blksz, ==, db->db_size);
	ASSERT3U(bufsz, >=, db->db_size);
	ASSERT(nwords != NULL);

	uint64_t *words = db->db_data;
	*nwords =
	(sm->sm_phys->smp_length - db->db_offset) / sizeof (uint64_t);

	ASSERT3U(*nwords, <=, bufsz / sizeof (uint64_t));

	uint64_t n = *nwords;
	uint64_t j = n - 1;
	for (uint64_t i = 0; i < n; i++) {
	uint64_t entry = words[i];
	if (sm_entry_is_double_word(entry)) {
	/*
	* Since we are populating the buffer backwards
	* we have to be extra careful and add the two
	* words of the double-word entry in the right
	* order.
	*/
	ASSERT3U(j, >, 0);
	buf[j - 1] = entry;

	i++;
	ASSERT3U(i, <, n);
	entry = words[i];
	buf[j] = entry;
	j -= 2;
	} else {
	ASSERT(sm_entry_is_debug(entry) \|\|
	sm_entry_is_single_word(entry));
	buf[j] = entry;
	j--;
	}
	}

	/*
	* Assert that we wrote backwards all the
	* way to the beginning of the buffer.
	*/
	ASSERT3S(j, ==, -1);

	dmu_buf_rele(db, FTAG);
	return (error);
	}

	/*
	* Note: This function performs destructive actions - specifically
	* it deletes entries from the end of the space map. Thus, callers
	* should ensure that they are holding the appropriate locks for
	* the space map that they provide.
	*/
	int
	space_map_incremental_destroy(space_map_t sm, sm_cb_t callback, void arg,
	dmu_tx_t *tx)
	{
	uint64_t bufsz = MAX(sm->sm_blksz, SPA_MINBLOCKSIZE);
	uint64_t *buf = zio_buf_alloc(bufsz);

	dmu_buf_will_dirty(sm->sm_dbuf, tx);

	/*
	* Ideally we would want to iterate from the beginning of the
	* space map to the end in incremental steps. The issue with this
	* approach is that we don't have any field on-disk that points
	* us where to start between each step. We could try zeroing out
	* entries that we've destroyed, but this doesn't work either as
	* an entry that is 0 is a valid one (ALLOC for range [0x0:0x200]).
	*
	* As a result, we destroy its entries incrementally starting from
	* the end after applying the callback to each of them.
	*
	* The problem with this approach is that we cannot literally
	* iterate through the words in the space map backwards as we
	* can't distinguish two-word space map entries from their second
	* word. Thus we do the following:
	*
	* 1] We get all the entries from the last block of the space map
	* and put them into a buffer in reverse order. This way the
	* last entry comes first in the buffer, the second to last is
	* second, etc.
	* 2] We iterate through the entries in the buffer and we apply
	* the callback to each one. As we move from entry to entry we
	* we decrease the size of the space map, deleting effectively
	* each entry.
	* 3] If there are no more entries in the space map or the callback
	* returns a value other than 0, we stop iterating over the
	* space map. If there are entries remaining and the callback
	* returned 0, we go back to step [1].
	*/
	int error = 0;
	while (space_map_length(sm) > 0 && error == 0) {
	uint64_t nwords = 0;
	error = space_map_reversed_last_block_entries(sm, buf, bufsz,
	&nwords);
	if (error != 0)
	break;

	ASSERT3U(nwords, <=, bufsz / sizeof (uint64_t));

	for (uint64_t i = 0; i < nwords; i++) {
	uint64_t e = buf[i];

	if (sm_entry_is_debug(e)) {
	sm->sm_phys->smp_length -= sizeof (uint64_t);
	continue;
	}

	int words = 1;
	uint64_t raw_offset, raw_run, vdev_id;
	maptype_t type;
	if (sm_entry_is_single_word(e)) {
	type = SM_TYPE_DECODE(e);
	vdev_id = SM_NO_VDEVID;
	raw_offset = SM_OFFSET_DECODE(e);
	raw_run = SM_RUN_DECODE(e);
	} else {
	ASSERT(sm_entry_is_double_word(e));
	words = 2;

	raw_run = SM2_RUN_DECODE(e);
	vdev_id = SM2_VDEV_DECODE(e);

	/* move to the second word */
	i++;
	e = buf[i];

	ASSERT3P(i, <=, nwords);

	type = SM2_TYPE_DECODE(e);
	raw_offset = SM2_OFFSET_DECODE(e);
	}

	uint64_t entry_offset =
	(raw_offset << sm->sm_shift) + sm->sm_start;
	uint64_t entry_run = raw_run << sm->sm_shift;

	VERIFY0(P2PHASE(entry_offset, 1ULL << sm->sm_shift));
	VERIFY0(P2PHASE(entry_run, 1ULL << sm->sm_shift));
	VERIFY3U(entry_offset, >=, sm->sm_start);
	VERIFY3U(entry_offset, <, sm->sm_start + sm->sm_size);
	VERIFY3U(entry_run, <=, sm->sm_size);
	VERIFY3U(entry_offset + entry_run, <=,
	sm->sm_start + sm->sm_size);

	space_map_entry_t sme = {
	.sme_type = type,
	.sme_vdev = vdev_id,
	.sme_offset = entry_offset,
	.sme_run = entry_run
	};
	error = callback(&sme, arg);
	if (error != 0)
	break;

	if (type == SM_ALLOC)
	sm->sm_phys->smp_alloc -= entry_run;
	else
	sm->sm_phys->smp_alloc += entry_run;
	sm->sm_phys->smp_length -= words * sizeof (uint64_t);
	}
	}

	if (space_map_length(sm) == 0) {
	ASSERT0(error);
	ASSERT0(space_map_allocated(sm));
	}

	zio_buf_free(buf, bufsz);
	return (error);
	}

	typedef struct space_map_load_arg {
	space_map_t *smla_sm;
	range_tree_t *smla_rt;
	maptype_t smla_type;
	} space_map_load_arg_t;

	static int
	space_map_load_callback(space_map_entry_t sme, void arg)
	{
	space_map_load_arg_t *smla = arg;
	if (sme->sme_type == smla->smla_type) {
	VERIFY3U(range_tree_space(smla->smla_rt) + sme->sme_run, <=,
	smla->smla_sm->sm_size);
	range_tree_add(smla->smla_rt, sme->sme_offset, sme->sme_run);
	} else {
	range_tree_remove(smla->smla_rt, sme->sme_offset, sme->sme_run);
	}

	return (0);
	}

	/*
	* Load the spacemap into the rangetree, like space_map_load. But only
	* read the first 'length' bytes of the spacemap.
	*/
	int
	space_map_load_length(space_map_t sm, range_tree_t rt, maptype_t maptype,
	uint64_t length)
	{
	space_map_load_arg_t smla;

	VERIFY0(range_tree_space(rt));

	if (maptype == SM_FREE)
	range_tree_add(rt, sm->sm_start, sm->sm_size);

	smla.smla_rt = rt;
	smla.smla_sm = sm;
	smla.smla_type = maptype;
	int err = space_map_iterate(sm, length,
	space_map_load_callback, &smla);

	if (err != 0)
	range_tree_vacate(rt, NULL, NULL);

	return (err);
	}

	/*
	* Load the space map disk into the specified range tree. Segments of maptype
	* are added to the range tree, other segment types are removed.
	*/
	int
	space_map_load(space_map_t sm, range_tree_t rt, maptype_t maptype)
	{
	return (space_map_load_length(sm, rt, maptype, space_map_length(sm)));
	}

	void
	space_map_histogram_clear(space_map_t *sm)
	{
	if (sm->sm_dbuf->db_size != sizeof (space_map_phys_t))
	return;

	bzero(sm->sm_phys->smp_histogram, sizeof (sm->sm_phys->smp_histogram));
	}

	boolean_t
	space_map_histogram_verify(space_map_t sm, range_tree_t rt)
	{
	/*
	* Verify that the in-core range tree does not have any
	* ranges smaller than our sm_shift size.
	*/
	for (int i = 0; i < sm->sm_shift; i++) {
	if (rt->rt_histogram[i] != 0)
	return (B_FALSE);
	}
	return (B_TRUE);
	}

	void
	space_map_histogram_add(space_map_t sm, range_tree_t rt, dmu_tx_t *tx)
	{
	int idx = 0;

	ASSERT(dmu_tx_is_syncing(tx));
	VERIFY3U(space_map_object(sm), !=, 0);

	if (sm->sm_dbuf->db_size != sizeof (space_map_phys_t))
	return;

	dmu_buf_will_dirty(sm->sm_dbuf, tx);

	ASSERT(space_map_histogram_verify(sm, rt));
	/*
	* Transfer the content of the range tree histogram to the space
	* map histogram. The space map histogram contains 32 buckets ranging
	* between 2^sm_shift to 2^(32+sm_shift-1). The range tree,
	* however, can represent ranges from 2^0 to 2^63. Since the space
	* map only cares about allocatable blocks (minimum of sm_shift) we
	* can safely ignore all ranges in the range tree smaller than sm_shift.
	*/
	for (int i = sm->sm_shift; i < RANGE_TREE_HISTOGRAM_SIZE; i++) {

	/*
	* Since the largest histogram bucket in the space map is
	* 2^(32+sm_shift-1), we need to normalize the values in
	* the range tree for any bucket larger than that size. For
	* example given an sm_shift of 9, ranges larger than 2^40
	* would get normalized as if they were 1TB ranges. Assume
	* the range tree had a count of 5 in the 2^44 (16TB) bucket,
	* the calculation below would normalize this to 5 * 2^4 (16).
	*/
	ASSERT3U(i, >=, idx + sm->sm_shift);
	sm->sm_phys->smp_histogram[idx] +=
	rt->rt_histogram[i] << (i - idx - sm->sm_shift);

	/*
	* Increment the space map's index as long as we haven't
	* reached the maximum bucket size. Accumulate all ranges
	* larger than the max bucket size into the last bucket.
	*/
	if (idx < SPACE_MAP_HISTOGRAM_SIZE - 1) {
	ASSERT3U(idx + sm->sm_shift, ==, i);
	idx++;
	ASSERT3U(idx, <, SPACE_MAP_HISTOGRAM_SIZE);
	}
	}
	}

	static void
	space_map_write_intro_debug(space_map_t sm, maptype_t maptype, dmu_tx_t tx)
	{
	dmu_buf_will_dirty(sm->sm_dbuf, tx);

	uint64_t dentry = SM_PREFIX_ENCODE(SM_DEBUG_PREFIX) \|
	SM_DEBUG_ACTION_ENCODE(maptype) \|
	SM_DEBUG_SYNCPASS_ENCODE(spa_sync_pass(tx->tx_pool->dp_spa)) \|
	SM_DEBUG_TXG_ENCODE(dmu_tx_get_txg(tx));

	dmu_write(sm->sm_os, space_map_object(sm), sm->sm_phys->smp_length,
	sizeof (dentry), &dentry, tx);

	sm->sm_phys->smp_length += sizeof (dentry);
	}

	/*
	* Writes one or more entries given a segment.
	*
	* Note: The function may release the dbuf from the pointer initially
	* passed to it, and return a different dbuf. Also, the space map's
	* dbuf must be dirty for the changes in sm_phys to take effect.
	*/
	static void
	space_map_write_seg(space_map_t *sm, uint64_t rstart, uint64_t rend,
	maptype_t maptype, uint64_t vdev_id, uint8_t words, dmu_buf_t **dbp,
	void tag, dmu_tx_t tx)
	{
	ASSERT3U(words, !=, 0);
	ASSERT3U(words, <=, 2);

	/* ensure the vdev_id can be represented by the space map */
	ASSERT3U(vdev_id, <=, SM_NO_VDEVID);

	/*
	* if this is a single word entry, ensure that no vdev was
	* specified.
	*/
	IMPLY(words == 1, vdev_id == SM_NO_VDEVID);

	dmu_buf_t db = dbp;
	ASSERT3U(db->db_size, ==, sm->sm_blksz);

	uint64_t *block_base = db->db_data;
	uint64_t *block_end = block_base + (sm->sm_blksz / sizeof (uint64_t));
	uint64_t *block_cursor = block_base +
	(sm->sm_phys->smp_length - db->db_offset) / sizeof (uint64_t);

	ASSERT3P(block_cursor, <=, block_end);

	uint64_t size = (rend - rstart) >> sm->sm_shift;
	uint64_t start = (rstart - sm->sm_start) >> sm->sm_shift;
	uint64_t run_max = (words == 2) ? SM2_RUN_MAX : SM_RUN_MAX;

	ASSERT3U(rstart, >=, sm->sm_start);
	ASSERT3U(rstart, <, sm->sm_start + sm->sm_size);
	ASSERT3U(rend - rstart, <=, sm->sm_size);
	ASSERT3U(rend, <=, sm->sm_start + sm->sm_size);

	while (size != 0) {
	ASSERT3P(block_cursor, <=, block_end);

	/*
	* If we are at the end of this block, flush it and start
	* writing again from the beginning.
	*/
	if (block_cursor == block_end) {
	dmu_buf_rele(db, tag);

	uint64_t next_word_offset = sm->sm_phys->smp_length;
	VERIFY0(dmu_buf_hold(sm->sm_os,
	space_map_object(sm), next_word_offset,
	tag, &db, DMU_READ_PREFETCH));
	dmu_buf_will_dirty(db, tx);

	/* update caller's dbuf */
	*dbp = db;

	ASSERT3U(db->db_size, ==, sm->sm_blksz);

	block_base = db->db_data;
	block_cursor = block_base;
	block_end = block_base +
	(db->db_size / sizeof (uint64_t));
	}

	/*
	* If we are writing a two-word entry and we only have one
	* word left on this block, just pad it with an empty debug
	* entry and write the two-word entry in the next block.
	*/
	uint64_t *next_entry = block_cursor + 1;
	if (next_entry == block_end && words > 1) {
	ASSERT3U(words, ==, 2);
	*block_cursor = SM_PREFIX_ENCODE(SM_DEBUG_PREFIX) \|
	SM_DEBUG_ACTION_ENCODE(0) \|
	SM_DEBUG_SYNCPASS_ENCODE(0) \|
	SM_DEBUG_TXG_ENCODE(0);
	block_cursor++;
	sm->sm_phys->smp_length += sizeof (uint64_t);
	ASSERT3P(block_cursor, ==, block_end);
	continue;
	}

	uint64_t run_len = MIN(size, run_max);
	switch (words) {
	case 1:
	*block_cursor = SM_OFFSET_ENCODE(start) \|
	SM_TYPE_ENCODE(maptype) \|
	SM_RUN_ENCODE(run_len);
	block_cursor++;
	break;
	case 2:
	/* write the first word of the entry */
	*block_cursor = SM_PREFIX_ENCODE(SM2_PREFIX) \|
	SM2_RUN_ENCODE(run_len) \|
	SM2_VDEV_ENCODE(vdev_id);
	block_cursor++;

	/* move on to the second word of the entry */
	ASSERT3P(block_cursor, <, block_end);
	*block_cursor = SM2_TYPE_ENCODE(maptype) \|
	SM2_OFFSET_ENCODE(start);
	block_cursor++;
	break;
	default:
	panic("%d-word space map entries are not supported",
	words);
	break;
	}
	sm->sm_phys->smp_length += words * sizeof (uint64_t);

	start += run_len;
	size -= run_len;
	}
	ASSERT0(size);

	}

	/*
	* Note: The space map's dbuf must be dirty for the changes in sm_phys to
	* take effect.
	*/
	static void
	space_map_write_impl(space_map_t sm, range_tree_t rt, maptype_t maptype,
	uint64_t vdev_id, dmu_tx_t *tx)
	{
	spa_t *spa = tx->tx_pool->dp_spa;
	dmu_buf_t *db;

	space_map_write_intro_debug(sm, maptype, tx);

	#ifdef ZFS_DEBUG
	/*
	* We do this right after we write the intro debug entry
	* because the estimate does not take it into account.
	*/
	uint64_t initial_objsize = sm->sm_phys->smp_length;
	uint64_t estimated_growth =
	space_map_estimate_optimal_size(sm, rt, SM_NO_VDEVID);
	uint64_t estimated_final_objsize = initial_objsize + estimated_growth;
	#endif

	/*
	* Find the offset right after the last word in the space map
	* and use that to get a hold of the last block, so we can
	* start appending to it.
	*/
	uint64_t next_word_offset = sm->sm_phys->smp_length;
	VERIFY0(dmu_buf_hold(sm->sm_os, space_map_object(sm),
	next_word_offset, FTAG, &db, DMU_READ_PREFETCH));
	ASSERT3U(db->db_size, ==, sm->sm_blksz);

	dmu_buf_will_dirty(db, tx);

	zfs_btree_t *t = &rt->rt_root;
	zfs_btree_index_t where;
	for (range_seg_t *rs = zfs_btree_first(t, &where); rs != NULL;
	rs = zfs_btree_next(t, &where, &where)) {
	uint64_t offset = (rs_get_start(rs, rt) - sm->sm_start) >>
	sm->sm_shift;
	uint64_t length = (rs_get_end(rs, rt) - rs_get_start(rs, rt)) >>
	sm->sm_shift;
	uint8_t words = 1;

	/*
	* We only write two-word entries when both of the following
	* are true:
	*
	* [1] The feature is enabled.
	* [2] The offset or run is too big for a single-word entry,
	* or the vdev_id is set (meaning not equal to
	* SM_NO_VDEVID).
	*
	* Note that for purposes of testing we've added the case that
	* we write two-word entries occasionally when the feature is
	* enabled and zfs_force_some_double_word_sm_entries has been
	* set.
	*/
	if (spa_feature_is_active(spa, SPA_FEATURE_SPACEMAP_V2) &&
	(offset >= (1ULL << SM_OFFSET_BITS) \|\|
	length > SM_RUN_MAX \|\|
	vdev_id != SM_NO_VDEVID \|\|
	(zfs_force_some_double_word_sm_entries &&
	- spa_get_random(100) == 0)))
	+ random_in_range(100) == 0)))
	words = 2;

	space_map_write_seg(sm, rs_get_start(rs, rt), rs_get_end(rs,
	rt), maptype, vdev_id, words, &db, FTAG, tx);
	}

	dmu_buf_rele(db, FTAG);

	#ifdef ZFS_DEBUG
	/*
	* We expect our estimation to be based on the worst case
	* scenario [see comment in space_map_estimate_optimal_size()].
	* Therefore we expect the actual objsize to be equal or less
	* than whatever we estimated it to be.
	*/
	ASSERT3U(estimated_final_objsize, >=, sm->sm_phys->smp_length);
	#endif
	}

	/*
	* Note: This function manipulates the state of the given space map but
	* does not hold any locks implicitly. Thus the caller is responsible
	* for synchronizing writes to the space map.
	*/
	void
	space_map_write(space_map_t sm, range_tree_t rt, maptype_t maptype,
	uint64_t vdev_id, dmu_tx_t *tx)
	{
	ASSERT(dsl_pool_sync_context(dmu_objset_pool(sm->sm_os)));
	VERIFY3U(space_map_object(sm), !=, 0);

	dmu_buf_will_dirty(sm->sm_dbuf, tx);

	/*
	* This field is no longer necessary since the in-core space map
	* now contains the object number but is maintained for backwards
	* compatibility.
	*/
	sm->sm_phys->smp_object = sm->sm_object;

	if (range_tree_is_empty(rt)) {
	VERIFY3U(sm->sm_object, ==, sm->sm_phys->smp_object);
	return;
	}

	if (maptype == SM_ALLOC)
	sm->sm_phys->smp_alloc += range_tree_space(rt);
	else
	sm->sm_phys->smp_alloc -= range_tree_space(rt);

	uint64_t nodes = zfs_btree_numnodes(&rt->rt_root);
	uint64_t rt_space = range_tree_space(rt);

	space_map_write_impl(sm, rt, maptype, vdev_id, tx);

	/*
	* Ensure that the space_map's accounting wasn't changed
	* while we were in the middle of writing it out.
	*/
	VERIFY3U(nodes, ==, zfs_btree_numnodes(&rt->rt_root));
	VERIFY3U(range_tree_space(rt), ==, rt_space);
	}

	static int
	space_map_open_impl(space_map_t *sm)
	{
	int error;
	u_longlong_t blocks;

	error = dmu_bonus_hold(sm->sm_os, sm->sm_object, sm, &sm->sm_dbuf);
	if (error)
	return (error);

	dmu_object_size_from_db(sm->sm_dbuf, &sm->sm_blksz, &blocks);
	sm->sm_phys = sm->sm_dbuf->db_data;
	return (0);
	}

	int
	space_map_open(space_map_t *smp, objset_t os, uint64_t object,
	uint64_t start, uint64_t size, uint8_t shift)
	{
	space_map_t *sm;
	int error;

	ASSERT(*smp == NULL);
	ASSERT(os != NULL);
	ASSERT(object != 0);

	sm = kmem_alloc(sizeof (space_map_t), KM_SLEEP);

	sm->sm_start = start;
	sm->sm_size = size;
	sm->sm_shift = shift;
	sm->sm_os = os;
	sm->sm_object = object;
	sm->sm_blksz = 0;
	sm->sm_dbuf = NULL;
	sm->sm_phys = NULL;

	error = space_map_open_impl(sm);
	if (error != 0) {
	space_map_close(sm);
	return (error);
	}
	*smp = sm;

	return (0);
	}

	void
	space_map_close(space_map_t *sm)
	{
	if (sm == NULL)
	return;

	if (sm->sm_dbuf != NULL)
	dmu_buf_rele(sm->sm_dbuf, sm);
	sm->sm_dbuf = NULL;
	sm->sm_phys = NULL;

	kmem_free(sm, sizeof (*sm));
	}

	void
	space_map_truncate(space_map_t sm, int blocksize, dmu_tx_t tx)
	{
	objset_t *os = sm->sm_os;
	spa_t *spa = dmu_objset_spa(os);
	dmu_object_info_t doi;

	ASSERT(dsl_pool_sync_context(dmu_objset_pool(os)));
	ASSERT(dmu_tx_is_syncing(tx));
	VERIFY3U(dmu_tx_get_txg(tx), <=, spa_final_dirty_txg(spa));

	dmu_object_info_from_db(sm->sm_dbuf, &doi);

	/*
	* If the space map has the wrong bonus size (because
	* SPA_FEATURE_SPACEMAP_HISTOGRAM has recently been enabled), or
	* the wrong block size (because space_map_blksz has changed),
	* free and re-allocate its object with the updated sizes.
	*
	* Otherwise, just truncate the current object.
	*/
	if ((spa_feature_is_enabled(spa, SPA_FEATURE_SPACEMAP_HISTOGRAM) &&
	doi.doi_bonus_size != sizeof (space_map_phys_t)) \|\|
	doi.doi_data_block_size != blocksize \|\|
	doi.doi_metadata_block_size != 1 << space_map_ibs) {
	zfs_dbgmsg("txg %llu, spa %s, sm %px, reallocating "
	"object[%llu]: old bonus %llu, old blocksz %u",
	(u_longlong_t)dmu_tx_get_txg(tx), spa_name(spa), sm,
	(u_longlong_t)sm->sm_object,
	(u_longlong_t)doi.doi_bonus_size,
	doi.doi_data_block_size);

	space_map_free(sm, tx);
	dmu_buf_rele(sm->sm_dbuf, sm);

	sm->sm_object = space_map_alloc(sm->sm_os, blocksize, tx);
	VERIFY0(space_map_open_impl(sm));
	} else {
	VERIFY0(dmu_free_range(os, space_map_object(sm), 0, -1ULL, tx));

	/*
	* If the spacemap is reallocated, its histogram
	* will be reset. Do the same in the common case so that
	* bugs related to the uncommon case do not go unnoticed.
	*/
	bzero(sm->sm_phys->smp_histogram,
	sizeof (sm->sm_phys->smp_histogram));
	}

	dmu_buf_will_dirty(sm->sm_dbuf, tx);
	sm->sm_phys->smp_length = 0;
	sm->sm_phys->smp_alloc = 0;
	}

	uint64_t
	space_map_alloc(objset_t os, int blocksize, dmu_tx_t tx)
	{
	spa_t *spa = dmu_objset_spa(os);
	uint64_t object;
	int bonuslen;

	if (spa_feature_is_enabled(spa, SPA_FEATURE_SPACEMAP_HISTOGRAM)) {
	spa_feature_incr(spa, SPA_FEATURE_SPACEMAP_HISTOGRAM, tx);
	bonuslen = sizeof (space_map_phys_t);
	ASSERT3U(bonuslen, <=, dmu_bonus_max());
	} else {
	bonuslen = SPACE_MAP_SIZE_V0;
	}

	object = dmu_object_alloc_ibs(os, DMU_OT_SPACE_MAP, blocksize,
	space_map_ibs, DMU_OT_SPACE_MAP_HEADER, bonuslen, tx);

	return (object);
	}

	void
	space_map_free_obj(objset_t os, uint64_t smobj, dmu_tx_t tx)
	{
	spa_t *spa = dmu_objset_spa(os);
	if (spa_feature_is_enabled(spa, SPA_FEATURE_SPACEMAP_HISTOGRAM)) {
	dmu_object_info_t doi;

	VERIFY0(dmu_object_info(os, smobj, &doi));
	if (doi.doi_bonus_size != SPACE_MAP_SIZE_V0) {
	spa_feature_decr(spa,
	SPA_FEATURE_SPACEMAP_HISTOGRAM, tx);
	}
	}

	VERIFY0(dmu_object_free(os, smobj, tx));
	}

	void
	space_map_free(space_map_t sm, dmu_tx_t tx)
	{
	if (sm == NULL)
	return;

	space_map_free_obj(sm->sm_os, space_map_object(sm), tx);
	sm->sm_object = 0;
	}

	/*
	* Given a range tree, it makes a worst-case estimate of how much
	* space would the tree's segments take if they were written to
	* the given space map.
	*/
	uint64_t
	space_map_estimate_optimal_size(space_map_t sm, range_tree_t rt,
	uint64_t vdev_id)
	{
	spa_t *spa = dmu_objset_spa(sm->sm_os);
	uint64_t shift = sm->sm_shift;
	uint64_t *histogram = rt->rt_histogram;
	uint64_t entries_for_seg = 0;

	/*
	* In order to get a quick estimate of the optimal size that this
	* range tree would have on-disk as a space map, we iterate through
	* its histogram buckets instead of iterating through its nodes.
	*
	* Note that this is a highest-bound/worst-case estimate for the
	* following reasons:
	*
	* 1] We assume that we always add a debug padding for each block
	* we write and we also assume that we start at the last word
	* of a block attempting to write a two-word entry.
	* 2] Rounding up errors due to the way segments are distributed
	* in the buckets of the range tree's histogram.
	* 3] The activation of zfs_force_some_double_word_sm_entries
	* (tunable) when testing.
	*
	* = Math and Rounding Errors =
	*
	* rt_histogram[i] bucket of a range tree represents the number
	* of entries in [2^i, (2^(i+1))-1] of that range_tree. Given
	* that, we want to divide the buckets into groups: Buckets that
	* can be represented using a single-word entry, ones that can
	* be represented with a double-word entry, and ones that can
	* only be represented with multiple two-word entries.
	*
	* [Note that if the new encoding feature is not enabled there
	* are only two groups: single-word entry buckets and multiple
	* single-word entry buckets. The information below assumes
	* two-word entries enabled, but it can easily applied when
	* the feature is not enabled]
	*
	* To find the highest bucket that can be represented with a
	* single-word entry we look at the maximum run that such entry
	* can have, which is 2^(SM_RUN_BITS + sm_shift) [remember that
	* the run of a space map entry is shifted by sm_shift, thus we
	* add it to the exponent]. This way, excluding the value of the
	* maximum run that can be represented by a single-word entry,
	* all runs that are smaller exist in buckets 0 to
	* SM_RUN_BITS + shift - 1.
	*
	* To find the highest bucket that can be represented with a
	* double-word entry, we follow the same approach. Finally, any
	* bucket higher than that are represented with multiple two-word
	* entries. To be more specific, if the highest bucket whose
	* segments can be represented with a single two-word entry is X,
	* then bucket X+1 will need 2 two-word entries for each of its
	* segments, X+2 will need 4, X+3 will need 8, ...etc.
	*
	* With all of the above we make our estimation based on bucket
	* groups. There is a rounding error though. As we mentioned in
	* the example with the one-word entry, the maximum run that can
	* be represented in a one-word entry 2^(SM_RUN_BITS + shift) is
	* not part of bucket SM_RUN_BITS + shift - 1. Thus, segments of
	* that length fall into the next bucket (and bucket group) where
	* we start counting two-word entries and this is one more reason
	* why the estimated size may end up being bigger than the actual
	* size written.
	*/
	uint64_t size = 0;
	uint64_t idx = 0;

	if (!spa_feature_is_enabled(spa, SPA_FEATURE_SPACEMAP_V2) \|\|
	(vdev_id == SM_NO_VDEVID && sm->sm_size < SM_OFFSET_MAX)) {

	/*
	* If we are trying to force some double word entries just
	* assume the worst-case of every single word entry being
	* written as a double word entry.
	*/
	uint64_t entry_size =
	(spa_feature_is_enabled(spa, SPA_FEATURE_SPACEMAP_V2) &&
	zfs_force_some_double_word_sm_entries) ?
	(2 * sizeof (uint64_t)) : sizeof (uint64_t);

	uint64_t single_entry_max_bucket = SM_RUN_BITS + shift - 1;
	for (; idx <= single_entry_max_bucket; idx++)
	size += histogram[idx] * entry_size;

	if (!spa_feature_is_enabled(spa, SPA_FEATURE_SPACEMAP_V2)) {
	for (; idx < RANGE_TREE_HISTOGRAM_SIZE; idx++) {
	ASSERT3U(idx, >=, single_entry_max_bucket);
	entries_for_seg =
	1ULL << (idx - single_entry_max_bucket);
	size += histogram[idx] *
	entries_for_seg * entry_size;
	}
	return (size);
	}
	}

	ASSERT(spa_feature_is_enabled(spa, SPA_FEATURE_SPACEMAP_V2));

	uint64_t double_entry_max_bucket = SM2_RUN_BITS + shift - 1;
	for (; idx <= double_entry_max_bucket; idx++)
	size += histogram[idx] * 2 * sizeof (uint64_t);

	for (; idx < RANGE_TREE_HISTOGRAM_SIZE; idx++) {
	ASSERT3U(idx, >=, double_entry_max_bucket);
	entries_for_seg = 1ULL << (idx - double_entry_max_bucket);
	size += histogram[idx] *
	entries_for_seg * 2 * sizeof (uint64_t);
	}

	/*
	* Assume the worst case where we start with the padding at the end
	* of the current block and we add an extra padding entry at the end
	* of all subsequent blocks.
	*/
	size += ((size / sm->sm_blksz) + 1) * sizeof (uint64_t);

	return (size);
	}

	uint64_t
	space_map_object(space_map_t *sm)
	{
	return (sm != NULL ? sm->sm_object : 0);
	}

	int64_t
	space_map_allocated(space_map_t *sm)
	{
	return (sm != NULL ? sm->sm_phys->smp_alloc : 0);
	}

	uint64_t
	space_map_length(space_map_t *sm)
	{
	return (sm != NULL ? sm->sm_phys->smp_length : 0);
	}

	uint64_t
	space_map_nblocks(space_map_t *sm)
	{
	if (sm == NULL)
	return (0);
	return (DIV_ROUND_UP(space_map_length(sm), sm->sm_blksz));
	}
	diff --git a/sys/contrib/openzfs/module/zfs/vdev_indirect.c b/sys/contrib/openzfs/module/zfs/vdev_indirect.c
	index 1b05ff03a0c5..3237dc4021a0 100644
	--- a/sys/contrib/openzfs/module/zfs/vdev_indirect.c
	+++ b/sys/contrib/openzfs/module/zfs/vdev_indirect.c
	@@ -1,1912 +1,1912 @@
	/*
	* CDDL HEADER START
	*
	* This file and its contents are supplied under the terms of the
	* Common Development and Distribution License ("CDDL"), version 1.0.
	* You may only use this file in accordance with the terms of version
	* 1.0 of the CDDL.
	*
	* A full copy of the text of the CDDL should have accompanied this
	* source. A copy of the CDDL is also available via the Internet at
	* http://www.illumos.org/license/CDDL.
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2014, 2017 by Delphix. All rights reserved.
	* Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
	* Copyright (c) 2014, 2020 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/vdev_impl.h>
	#include <sys/fs/zfs.h>
	#include <sys/zio.h>
	#include <sys/zio_checksum.h>
	#include <sys/metaslab.h>
	#include <sys/dmu.h>
	#include <sys/vdev_indirect_mapping.h>
	#include <sys/dmu_tx.h>
	#include <sys/dsl_synctask.h>
	#include <sys/zap.h>
	#include <sys/abd.h>
	#include <sys/zthr.h>

	/*
	* An indirect vdev corresponds to a vdev that has been removed. Since
	* we cannot rewrite block pointers of snapshots, etc., we keep a
	* mapping from old location on the removed device to the new location
	* on another device in the pool and use this mapping whenever we need
	* to access the DVA. Unfortunately, this mapping did not respect
	* logical block boundaries when it was first created, and so a DVA on
	* this indirect vdev may be "split" into multiple sections that each
	* map to a different location. As a consequence, not all DVAs can be
	* translated to an equivalent new DVA. Instead we must provide a
	* "vdev_remap" operation that executes a callback on each contiguous
	* segment of the new location. This function is used in multiple ways:
	*
	* - i/os to this vdev use the callback to determine where the
	* data is now located, and issue child i/os for each segment's new
	* location.
	*
	* - frees and claims to this vdev use the callback to free or claim
	* each mapped segment. (Note that we don't actually need to claim
	* log blocks on indirect vdevs, because we don't allocate to
	* removing vdevs. However, zdb uses zio_claim() for its leak
	* detection.)
	*/

	/*
	* "Big theory statement" for how we mark blocks obsolete.
	*
	* When a block on an indirect vdev is freed or remapped, a section of
	* that vdev's mapping may no longer be referenced (aka "obsolete"). We
	* keep track of how much of each mapping entry is obsolete. When
	* an entry becomes completely obsolete, we can remove it, thus reducing
	* the memory used by the mapping. The complete picture of obsolescence
	* is given by the following data structures, described below:
	* - the entry-specific obsolete count
	* - the vdev-specific obsolete spacemap
	* - the pool-specific obsolete bpobj
	*
	* == On disk data structures used ==
	*
	* We track the obsolete space for the pool using several objects. Each
	* of these objects is created on demand and freed when no longer
	* needed, and is assumed to be empty if it does not exist.
	* SPA_FEATURE_OBSOLETE_COUNTS includes the count of these objects.
	*
	* - Each vic_mapping_object (associated with an indirect vdev) can
	* have a vimp_counts_object. This is an array of uint32_t's
	* with the same number of entries as the vic_mapping_object. When
	* the mapping is condensed, entries from the vic_obsolete_sm_object
	* (see below) are folded into the counts. Therefore, each
	* obsolete_counts entry tells us the number of bytes in the
	* corresponding mapping entry that were not referenced when the
	* mapping was last condensed.
	*
	* - Each indirect or removing vdev can have a vic_obsolete_sm_object.
	* This is a space map containing an alloc entry for every DVA that
	* has been obsoleted since the last time this indirect vdev was
	* condensed. We use this object in order to improve performance
	* when marking a DVA as obsolete. Instead of modifying an arbitrary
	* offset of the vimp_counts_object, we only need to append an entry
	* to the end of this object. When a DVA becomes obsolete, it is
	* added to the obsolete space map. This happens when the DVA is
	* freed, remapped and not referenced by a snapshot, or the last
	* snapshot referencing it is destroyed.
	*
	* - Each dataset can have a ds_remap_deadlist object. This is a
	* deadlist object containing all blocks that were remapped in this
	* dataset but referenced in a previous snapshot. Blocks can only
	* appear on this list if they were remapped (dsl_dataset_block_remapped);
	* blocks that were killed in a head dataset are put on the normal
	* ds_deadlist and marked obsolete when they are freed.
	*
	* - The pool can have a dp_obsolete_bpobj. This is a list of blocks
	* in the pool that need to be marked obsolete. When a snapshot is
	* destroyed, we move some of the ds_remap_deadlist to the obsolete
	* bpobj (see dsl_destroy_snapshot_handle_remaps()). We then
	* asynchronously process the obsolete bpobj, moving its entries to
	* the specific vdevs' obsolete space maps.
	*
	* == Summary of how we mark blocks as obsolete ==
	*
	* - When freeing a block: if any DVA is on an indirect vdev, append to
	* vic_obsolete_sm_object.
	* - When remapping a block, add dva to ds_remap_deadlist (if prev snap
	* references; otherwise append to vic_obsolete_sm_object).
	* - When freeing a snapshot: move parts of ds_remap_deadlist to
	* dp_obsolete_bpobj (same algorithm as ds_deadlist).
	* - When syncing the spa: process dp_obsolete_bpobj, moving ranges to
	* individual vdev's vic_obsolete_sm_object.
	*/

	/*
	* "Big theory statement" for how we condense indirect vdevs.
	*
	* Condensing an indirect vdev's mapping is the process of determining
	* the precise counts of obsolete space for each mapping entry (by
	* integrating the obsolete spacemap into the obsolete counts) and
	* writing out a new mapping that contains only referenced entries.
	*
	* We condense a vdev when we expect the mapping to shrink (see
	* vdev_indirect_should_condense()), but only perform one condense at a
	* time to limit the memory usage. In addition, we use a separate
	* open-context thread (spa_condense_indirect_thread) to incrementally
	* create the new mapping object in a way that minimizes the impact on
	* the rest of the system.
	*
	* == Generating a new mapping ==
	*
	* To generate a new mapping, we follow these steps:
	*
	* 1. Save the old obsolete space map and create a new mapping object
	* (see spa_condense_indirect_start_sync()). This initializes the
	* spa_condensing_indirect_phys with the "previous obsolete space map",
	* which is now read only. Newly obsolete DVAs will be added to a
	* new (initially empty) obsolete space map, and will not be
	* considered as part of this condense operation.
	*
	* 2. Construct in memory the precise counts of obsolete space for each
	* mapping entry, by incorporating the obsolete space map into the
	* counts. (See vdev_indirect_mapping_load_obsolete_{counts,spacemap}().)
	*
	* 3. Iterate through each mapping entry, writing to the new mapping any
	* entries that are not completely obsolete (i.e. which don't have
	* obsolete count == mapping length). (See
	* spa_condense_indirect_generate_new_mapping().)
	*
	* 4. Destroy the old mapping object and switch over to the new one
	* (spa_condense_indirect_complete_sync).
	*
	* == Restarting from failure ==
	*
	* To restart the condense when we import/open the pool, we must start
	* at the 2nd step above: reconstruct the precise counts in memory,
	* based on the space map + counts. Then in the 3rd step, we start
	* iterating where we left off: at vimp_max_offset of the new mapping
	* object.
	*/

	int zfs_condense_indirect_vdevs_enable = B_TRUE;

	/*
	* Condense if at least this percent of the bytes in the mapping is
	* obsolete. With the default of 25%, the amount of space mapped
	* will be reduced to 1% of its original size after at most 16
	* condenses. Higher values will condense less often (causing less
	* i/o); lower values will reduce the mapping size more quickly.
	*/
	int zfs_condense_indirect_obsolete_pct = 25;

	/*
	* Condense if the obsolete space map takes up more than this amount of
	* space on disk (logically). This limits the amount of disk space
	* consumed by the obsolete space map; the default of 1GB is small enough
	* that we typically don't mind "wasting" it.
	*/
	unsigned long zfs_condense_max_obsolete_bytes = 1024 * 1024 * 1024;

	/*
	* Don't bother condensing if the mapping uses less than this amount of
	* memory. The default of 128KB is considered a "trivial" amount of
	* memory and not worth reducing.
	*/
	unsigned long zfs_condense_min_mapping_bytes = 128 * 1024;

	/*
	* This is used by the test suite so that it can ensure that certain
	* actions happen while in the middle of a condense (which might otherwise
	* complete too quickly). If used to reduce the performance impact of
	* condensing in production, a maximum value of 1 should be sufficient.
	*/
	int zfs_condense_indirect_commit_entry_delay_ms = 0;

	/*
	* If an indirect split block contains more than this many possible unique
	* combinations when being reconstructed, consider it too computationally
	* expensive to check them all. Instead, try at most 100 randomly-selected
	* combinations each time the block is accessed. This allows all segment
	* copies to participate fairly in the reconstruction when all combinations
	* cannot be checked and prevents repeated use of one bad copy.
	*/
	int zfs_reconstruct_indirect_combinations_max = 4096;

	/*
	* Enable to simulate damaged segments and validate reconstruction. This
	* is intentionally not exposed as a module parameter.
	*/
	unsigned long zfs_reconstruct_indirect_damage_fraction = 0;

	/*
	* The indirect_child_t represents the vdev that we will read from, when we
	* need to read all copies of the data (e.g. for scrub or reconstruction).
	* For plain (non-mirror) top-level vdevs (i.e. is_vdev is not a mirror),
	* ic_vdev is the same as is_vdev. However, for mirror top-level vdevs,
	* ic_vdev is a child of the mirror.
	*/
	typedef struct indirect_child {
	abd_t *ic_data;
	vdev_t *ic_vdev;

	/*
	* ic_duplicate is NULL when the ic_data contents are unique, when it
	* is determined to be a duplicate it references the primary child.
	*/
	struct indirect_child *ic_duplicate;
	list_node_t ic_node; /* node on is_unique_child */
	int ic_error; /* set when a child does not contain the data */
	} indirect_child_t;

	/*
	* The indirect_split_t represents one mapped segment of an i/o to the
	* indirect vdev. For non-split (contiguously-mapped) blocks, there will be
	* only one indirect_split_t, with is_split_offset==0 and is_size==io_size.
	* For split blocks, there will be several of these.
	*/
	typedef struct indirect_split {
	list_node_t is_node; /* link on iv_splits */

	/*
	* is_split_offset is the offset into the i/o.
	* This is the sum of the previous splits' is_size's.
	*/
	uint64_t is_split_offset;

	vdev_t is_vdev; / top-level vdev */
	uint64_t is_target_offset; /* offset on is_vdev */
	uint64_t is_size;
	int is_children; /* number of entries in is_child[] */
	int is_unique_children; /* number of entries in is_unique_child */
	list_t is_unique_child;

	/*
	* is_good_child is the child that we are currently using to
	* attempt reconstruction.
	*/
	indirect_child_t *is_good_child;

	indirect_child_t is_child[1]; /* variable-length */
	} indirect_split_t;

	/*
	* The indirect_vsd_t is associated with each i/o to the indirect vdev.
	* It is the "Vdev-Specific Data" in the zio_t's io_vsd.
	*/
	typedef struct indirect_vsd {
	boolean_t iv_split_block;
	boolean_t iv_reconstruct;
	uint64_t iv_unique_combinations;
	uint64_t iv_attempts;
	uint64_t iv_attempts_max;

	list_t iv_splits; /* list of indirect_split_t's */
	} indirect_vsd_t;

	static void
	vdev_indirect_map_free(zio_t *zio)
	{
	indirect_vsd_t *iv = zio->io_vsd;

	indirect_split_t *is;
	while ((is = list_head(&iv->iv_splits)) != NULL) {
	for (int c = 0; c < is->is_children; c++) {
	indirect_child_t *ic = &is->is_child[c];
	if (ic->ic_data != NULL)
	abd_free(ic->ic_data);
	}
	list_remove(&iv->iv_splits, is);

	indirect_child_t *ic;
	while ((ic = list_head(&is->is_unique_child)) != NULL)
	list_remove(&is->is_unique_child, ic);

	list_destroy(&is->is_unique_child);

	kmem_free(is,
	offsetof(indirect_split_t, is_child[is->is_children]));
	}
	kmem_free(iv, sizeof (*iv));
	}

	static const zio_vsd_ops_t vdev_indirect_vsd_ops = {
	.vsd_free = vdev_indirect_map_free,
	};

	/*
	* Mark the given offset and size as being obsolete.
	*/
	void
	vdev_indirect_mark_obsolete(vdev_t *vd, uint64_t offset, uint64_t size)
	{
	spa_t *spa = vd->vdev_spa;

	ASSERT3U(vd->vdev_indirect_config.vic_mapping_object, !=, 0);
	ASSERT(vd->vdev_removing \|\| vd->vdev_ops == &vdev_indirect_ops);
	ASSERT(size > 0);
	VERIFY(vdev_indirect_mapping_entry_for_offset(
	vd->vdev_indirect_mapping, offset) != NULL);

	if (spa_feature_is_enabled(spa, SPA_FEATURE_OBSOLETE_COUNTS)) {
	mutex_enter(&vd->vdev_obsolete_lock);
	range_tree_add(vd->vdev_obsolete_segments, offset, size);
	mutex_exit(&vd->vdev_obsolete_lock);
	vdev_dirty(vd, 0, NULL, spa_syncing_txg(spa));
	}
	}

	/*
	* Mark the DVA vdev_id:offset:size as being obsolete in the given tx. This
	* wrapper is provided because the DMU does not know about vdev_t's and
	* cannot directly call vdev_indirect_mark_obsolete.
	*/
	void
	spa_vdev_indirect_mark_obsolete(spa_t *spa, uint64_t vdev_id, uint64_t offset,
	uint64_t size, dmu_tx_t *tx)
	{
	vdev_t *vd = vdev_lookup_top(spa, vdev_id);
	ASSERT(dmu_tx_is_syncing(tx));

	/* The DMU can only remap indirect vdevs. */
	ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
	vdev_indirect_mark_obsolete(vd, offset, size);
	}

	static spa_condensing_indirect_t *
	spa_condensing_indirect_create(spa_t *spa)
	{
	spa_condensing_indirect_phys_t *scip =
	&spa->spa_condensing_indirect_phys;
	spa_condensing_indirect_t sci = kmem_zalloc(sizeof (sci), KM_SLEEP);
	objset_t *mos = spa->spa_meta_objset;

	for (int i = 0; i < TXG_SIZE; i++) {
	list_create(&sci->sci_new_mapping_entries[i],
	sizeof (vdev_indirect_mapping_entry_t),
	offsetof(vdev_indirect_mapping_entry_t, vime_node));
	}

	sci->sci_new_mapping =
	vdev_indirect_mapping_open(mos, scip->scip_next_mapping_object);

	return (sci);
	}

	static void
	spa_condensing_indirect_destroy(spa_condensing_indirect_t *sci)
	{
	for (int i = 0; i < TXG_SIZE; i++)
	list_destroy(&sci->sci_new_mapping_entries[i]);

	if (sci->sci_new_mapping != NULL)
	vdev_indirect_mapping_close(sci->sci_new_mapping);

	kmem_free(sci, sizeof (*sci));
	}

	boolean_t
	vdev_indirect_should_condense(vdev_t *vd)
	{
	vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
	spa_t *spa = vd->vdev_spa;

	ASSERT(dsl_pool_sync_context(spa->spa_dsl_pool));

	if (!zfs_condense_indirect_vdevs_enable)
	return (B_FALSE);

	/*
	* We can only condense one indirect vdev at a time.
	*/
	if (spa->spa_condensing_indirect != NULL)
	return (B_FALSE);

	if (spa_shutting_down(spa))
	return (B_FALSE);

	/*
	* The mapping object size must not change while we are
	* condensing, so we can only condense indirect vdevs
	* (not vdevs that are still in the middle of being removed).
	*/
	if (vd->vdev_ops != &vdev_indirect_ops)
	return (B_FALSE);

	/*
	* If nothing new has been marked obsolete, there is no
	* point in condensing.
	*/
	uint64_t obsolete_sm_obj __maybe_unused;
	ASSERT0(vdev_obsolete_sm_object(vd, &obsolete_sm_obj));
	if (vd->vdev_obsolete_sm == NULL) {
	ASSERT0(obsolete_sm_obj);
	return (B_FALSE);
	}

	ASSERT(vd->vdev_obsolete_sm != NULL);

	ASSERT3U(obsolete_sm_obj, ==, space_map_object(vd->vdev_obsolete_sm));

	uint64_t bytes_mapped = vdev_indirect_mapping_bytes_mapped(vim);
	uint64_t bytes_obsolete = space_map_allocated(vd->vdev_obsolete_sm);
	uint64_t mapping_size = vdev_indirect_mapping_size(vim);
	uint64_t obsolete_sm_size = space_map_length(vd->vdev_obsolete_sm);

	ASSERT3U(bytes_obsolete, <=, bytes_mapped);

	/*
	* If a high percentage of the bytes that are mapped have become
	* obsolete, condense (unless the mapping is already small enough).
	* This has a good chance of reducing the amount of memory used
	* by the mapping.
	*/
	if (bytes_obsolete * 100 / bytes_mapped >=
	zfs_condense_indirect_obsolete_pct &&
	mapping_size > zfs_condense_min_mapping_bytes) {
	zfs_dbgmsg("should condense vdev %llu because obsolete "
	"spacemap covers %d%% of %lluMB mapping",
	(u_longlong_t)vd->vdev_id,
	(int)(bytes_obsolete * 100 / bytes_mapped),
	(u_longlong_t)bytes_mapped / 1024 / 1024);
	return (B_TRUE);
	}

	/*
	* If the obsolete space map takes up too much space on disk,
	* condense in order to free up this disk space.
	*/
	if (obsolete_sm_size >= zfs_condense_max_obsolete_bytes) {
	zfs_dbgmsg("should condense vdev %llu because obsolete sm "
	"length %lluMB >= max size %lluMB",
	(u_longlong_t)vd->vdev_id,
	(u_longlong_t)obsolete_sm_size / 1024 / 1024,
	(u_longlong_t)zfs_condense_max_obsolete_bytes /
	1024 / 1024);
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	/*
	* This sync task completes (finishes) a condense, deleting the old
	* mapping and replacing it with the new one.
	*/
	static void
	spa_condense_indirect_complete_sync(void arg, dmu_tx_t tx)
	{
	spa_condensing_indirect_t *sci = arg;
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	spa_condensing_indirect_phys_t *scip =
	&spa->spa_condensing_indirect_phys;
	vdev_t *vd = vdev_lookup_top(spa, scip->scip_vdev);
	vdev_indirect_config_t *vic = &vd->vdev_indirect_config;
	objset_t *mos = spa->spa_meta_objset;
	vdev_indirect_mapping_t *old_mapping = vd->vdev_indirect_mapping;
	uint64_t old_count = vdev_indirect_mapping_num_entries(old_mapping);
	uint64_t new_count =
	vdev_indirect_mapping_num_entries(sci->sci_new_mapping);

	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
	ASSERT3P(sci, ==, spa->spa_condensing_indirect);
	for (int i = 0; i < TXG_SIZE; i++) {
	ASSERT(list_is_empty(&sci->sci_new_mapping_entries[i]));
	}
	ASSERT(vic->vic_mapping_object != 0);
	ASSERT3U(vd->vdev_id, ==, scip->scip_vdev);
	ASSERT(scip->scip_next_mapping_object != 0);
	ASSERT(scip->scip_prev_obsolete_sm_object != 0);

	/*
	* Reset vdev_indirect_mapping to refer to the new object.
	*/
	rw_enter(&vd->vdev_indirect_rwlock, RW_WRITER);
	vdev_indirect_mapping_close(vd->vdev_indirect_mapping);
	vd->vdev_indirect_mapping = sci->sci_new_mapping;
	rw_exit(&vd->vdev_indirect_rwlock);

	sci->sci_new_mapping = NULL;
	vdev_indirect_mapping_free(mos, vic->vic_mapping_object, tx);
	vic->vic_mapping_object = scip->scip_next_mapping_object;
	scip->scip_next_mapping_object = 0;

	space_map_free_obj(mos, scip->scip_prev_obsolete_sm_object, tx);
	spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
	scip->scip_prev_obsolete_sm_object = 0;

	scip->scip_vdev = 0;

	VERIFY0(zap_remove(mos, DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_CONDENSING_INDIRECT, tx));
	spa_condensing_indirect_destroy(spa->spa_condensing_indirect);
	spa->spa_condensing_indirect = NULL;

	zfs_dbgmsg("finished condense of vdev %llu in txg %llu: "
	"new mapping object %llu has %llu entries "
	"(was %llu entries)",
	(u_longlong_t)vd->vdev_id, (u_longlong_t)dmu_tx_get_txg(tx),
	(u_longlong_t)vic->vic_mapping_object,
	(u_longlong_t)new_count, (u_longlong_t)old_count);

	vdev_config_dirty(spa->spa_root_vdev);
	}

	/*
	* This sync task appends entries to the new mapping object.
	*/
	static void
	spa_condense_indirect_commit_sync(void arg, dmu_tx_t tx)
	{
	spa_condensing_indirect_t *sci = arg;
	uint64_t txg = dmu_tx_get_txg(tx);
	spa_t *spa __maybe_unused = dmu_tx_pool(tx)->dp_spa;

	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT3P(sci, ==, spa->spa_condensing_indirect);

	vdev_indirect_mapping_add_entries(sci->sci_new_mapping,
	&sci->sci_new_mapping_entries[txg & TXG_MASK], tx);
	ASSERT(list_is_empty(&sci->sci_new_mapping_entries[txg & TXG_MASK]));
	}

	/*
	* Open-context function to add one entry to the new mapping. The new
	* entry will be remembered and written from syncing context.
	*/
	static void
	spa_condense_indirect_commit_entry(spa_t *spa,
	vdev_indirect_mapping_entry_phys_t *vimep, uint32_t count)
	{
	spa_condensing_indirect_t *sci = spa->spa_condensing_indirect;

	ASSERT3U(count, <, DVA_GET_ASIZE(&vimep->vimep_dst));

	dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
	dmu_tx_hold_space(tx, sizeof (*vimep) + sizeof (count));
	VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
	int txgoff = dmu_tx_get_txg(tx) & TXG_MASK;

	/*
	* If we are the first entry committed this txg, kick off the sync
	* task to write to the MOS on our behalf.
	*/
	if (list_is_empty(&sci->sci_new_mapping_entries[txgoff])) {
	dsl_sync_task_nowait(dmu_tx_pool(tx),
	spa_condense_indirect_commit_sync, sci, tx);
	}

	vdev_indirect_mapping_entry_t *vime =
	kmem_alloc(sizeof (*vime), KM_SLEEP);
	vime->vime_mapping = *vimep;
	vime->vime_obsolete_count = count;
	list_insert_tail(&sci->sci_new_mapping_entries[txgoff], vime);

	dmu_tx_commit(tx);
	}

	static void
	spa_condense_indirect_generate_new_mapping(vdev_t *vd,
	uint32_t obsolete_counts, uint64_t start_index, zthr_t zthr)
	{
	spa_t *spa = vd->vdev_spa;
	uint64_t mapi = start_index;
	vdev_indirect_mapping_t *old_mapping = vd->vdev_indirect_mapping;
	uint64_t old_num_entries =
	vdev_indirect_mapping_num_entries(old_mapping);

	ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
	ASSERT3U(vd->vdev_id, ==, spa->spa_condensing_indirect_phys.scip_vdev);

	zfs_dbgmsg("starting condense of vdev %llu from index %llu",
	(u_longlong_t)vd->vdev_id,
	(u_longlong_t)mapi);

	while (mapi < old_num_entries) {

	if (zthr_iscancelled(zthr)) {
	zfs_dbgmsg("pausing condense of vdev %llu "
	"at index %llu", (u_longlong_t)vd->vdev_id,
	(u_longlong_t)mapi);
	break;
	}

	vdev_indirect_mapping_entry_phys_t *entry =
	&old_mapping->vim_entries[mapi];
	uint64_t entry_size = DVA_GET_ASIZE(&entry->vimep_dst);
	ASSERT3U(obsolete_counts[mapi], <=, entry_size);
	if (obsolete_counts[mapi] < entry_size) {
	spa_condense_indirect_commit_entry(spa, entry,
	obsolete_counts[mapi]);

	/*
	* This delay may be requested for testing, debugging,
	* or performance reasons.
	*/
	hrtime_t now = gethrtime();
	hrtime_t sleep_until = now + MSEC2NSEC(
	zfs_condense_indirect_commit_entry_delay_ms);
	zfs_sleep_until(sleep_until);
	}

	mapi++;
	}
	}

	/* ARGSUSED */
	static boolean_t
	spa_condense_indirect_thread_check(void arg, zthr_t zthr)
	{
	spa_t *spa = arg;

	return (spa->spa_condensing_indirect != NULL);
	}

	/* ARGSUSED */
	static void
	spa_condense_indirect_thread(void arg, zthr_t zthr)
	{
	spa_t *spa = arg;
	vdev_t *vd;

	ASSERT3P(spa->spa_condensing_indirect, !=, NULL);
	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
	vd = vdev_lookup_top(spa, spa->spa_condensing_indirect_phys.scip_vdev);
	ASSERT3P(vd, !=, NULL);
	spa_config_exit(spa, SCL_VDEV, FTAG);

	spa_condensing_indirect_t *sci = spa->spa_condensing_indirect;
	spa_condensing_indirect_phys_t *scip =
	&spa->spa_condensing_indirect_phys;
	uint32_t *counts;
	uint64_t start_index;
	vdev_indirect_mapping_t *old_mapping = vd->vdev_indirect_mapping;
	space_map_t *prev_obsolete_sm = NULL;

	ASSERT3U(vd->vdev_id, ==, scip->scip_vdev);
	ASSERT(scip->scip_next_mapping_object != 0);
	ASSERT(scip->scip_prev_obsolete_sm_object != 0);
	ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);

	for (int i = 0; i < TXG_SIZE; i++) {
	/*
	* The list must start out empty in order for the
	* _commit_sync() sync task to be properly registered
	* on the first call to _commit_entry(); so it's wise
	* to double check and ensure we actually are starting
	* with empty lists.
	*/
	ASSERT(list_is_empty(&sci->sci_new_mapping_entries[i]));
	}

	VERIFY0(space_map_open(&prev_obsolete_sm, spa->spa_meta_objset,
	scip->scip_prev_obsolete_sm_object, 0, vd->vdev_asize, 0));
	counts = vdev_indirect_mapping_load_obsolete_counts(old_mapping);
	if (prev_obsolete_sm != NULL) {
	vdev_indirect_mapping_load_obsolete_spacemap(old_mapping,
	counts, prev_obsolete_sm);
	}
	space_map_close(prev_obsolete_sm);

	/*
	* Generate new mapping. Determine what index to continue from
	* based on the max offset that we've already written in the
	* new mapping.
	*/
	uint64_t max_offset =
	vdev_indirect_mapping_max_offset(sci->sci_new_mapping);
	if (max_offset == 0) {
	/* We haven't written anything to the new mapping yet. */
	start_index = 0;
	} else {
	/*
	* Pick up from where we left off. _entry_for_offset()
	* returns a pointer into the vim_entries array. If
	* max_offset is greater than any of the mappings
	* contained in the table NULL will be returned and
	* that indicates we've exhausted our iteration of the
	* old_mapping.
	*/

	vdev_indirect_mapping_entry_phys_t *entry =
	vdev_indirect_mapping_entry_for_offset_or_next(old_mapping,
	max_offset);

	if (entry == NULL) {
	/*
	* We've already written the whole new mapping.
	* This special value will cause us to skip the
	* generate_new_mapping step and just do the sync
	* task to complete the condense.
	*/
	start_index = UINT64_MAX;
	} else {
	start_index = entry - old_mapping->vim_entries;
	ASSERT3U(start_index, <,
	vdev_indirect_mapping_num_entries(old_mapping));
	}
	}

	spa_condense_indirect_generate_new_mapping(vd, counts,
	start_index, zthr);

	vdev_indirect_mapping_free_obsolete_counts(old_mapping, counts);

	/*
	* If the zthr has received a cancellation signal while running
	* in generate_new_mapping() or at any point after that, then bail
	* early. We don't want to complete the condense if the spa is
	* shutting down.
	*/
	if (zthr_iscancelled(zthr))
	return;

	VERIFY0(dsl_sync_task(spa_name(spa), NULL,
	spa_condense_indirect_complete_sync, sci, 0,
	ZFS_SPACE_CHECK_EXTRA_RESERVED));
	}

	/*
	* Sync task to begin the condensing process.
	*/
	void
	spa_condense_indirect_start_sync(vdev_t vd, dmu_tx_t tx)
	{
	spa_t *spa = vd->vdev_spa;
	spa_condensing_indirect_phys_t *scip =
	&spa->spa_condensing_indirect_phys;

	ASSERT0(scip->scip_next_mapping_object);
	ASSERT0(scip->scip_prev_obsolete_sm_object);
	ASSERT0(scip->scip_vdev);
	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT3P(vd->vdev_ops, ==, &vdev_indirect_ops);
	ASSERT(spa_feature_is_active(spa, SPA_FEATURE_OBSOLETE_COUNTS));
	ASSERT(vdev_indirect_mapping_num_entries(vd->vdev_indirect_mapping));

	uint64_t obsolete_sm_obj;
	VERIFY0(vdev_obsolete_sm_object(vd, &obsolete_sm_obj));
	ASSERT3U(obsolete_sm_obj, !=, 0);

	scip->scip_vdev = vd->vdev_id;
	scip->scip_next_mapping_object =
	vdev_indirect_mapping_alloc(spa->spa_meta_objset, tx);

	scip->scip_prev_obsolete_sm_object = obsolete_sm_obj;

	/*
	* We don't need to allocate a new space map object, since
	* vdev_indirect_sync_obsolete will allocate one when needed.
	*/
	space_map_close(vd->vdev_obsolete_sm);
	vd->vdev_obsolete_sm = NULL;
	VERIFY0(zap_remove(spa->spa_meta_objset, vd->vdev_top_zap,
	VDEV_TOP_ZAP_INDIRECT_OBSOLETE_SM, tx));

	VERIFY0(zap_add(spa->spa_dsl_pool->dp_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_CONDENSING_INDIRECT, sizeof (uint64_t),
	sizeof (*scip) / sizeof (uint64_t), scip, tx));

	ASSERT3P(spa->spa_condensing_indirect, ==, NULL);
	spa->spa_condensing_indirect = spa_condensing_indirect_create(spa);

	zfs_dbgmsg("starting condense of vdev %llu in txg %llu: "
	"posm=%llu nm=%llu",
	(u_longlong_t)vd->vdev_id, (u_longlong_t)dmu_tx_get_txg(tx),
	(u_longlong_t)scip->scip_prev_obsolete_sm_object,
	(u_longlong_t)scip->scip_next_mapping_object);

	zthr_wakeup(spa->spa_condense_zthr);
	}

	/*
	* Sync to the given vdev's obsolete space map any segments that are no longer
	* referenced as of the given txg.
	*
	* If the obsolete space map doesn't exist yet, create and open it.
	*/
	void
	vdev_indirect_sync_obsolete(vdev_t vd, dmu_tx_t tx)
	{
	spa_t *spa = vd->vdev_spa;
	vdev_indirect_config_t *vic __maybe_unused = &vd->vdev_indirect_config;

	ASSERT3U(vic->vic_mapping_object, !=, 0);
	ASSERT(range_tree_space(vd->vdev_obsolete_segments) > 0);
	ASSERT(vd->vdev_removing \|\| vd->vdev_ops == &vdev_indirect_ops);
	ASSERT(spa_feature_is_enabled(spa, SPA_FEATURE_OBSOLETE_COUNTS));

	uint64_t obsolete_sm_object;
	VERIFY0(vdev_obsolete_sm_object(vd, &obsolete_sm_object));
	if (obsolete_sm_object == 0) {
	obsolete_sm_object = space_map_alloc(spa->spa_meta_objset,
	zfs_vdev_standard_sm_blksz, tx);

	ASSERT(vd->vdev_top_zap != 0);
	VERIFY0(zap_add(vd->vdev_spa->spa_meta_objset, vd->vdev_top_zap,
	VDEV_TOP_ZAP_INDIRECT_OBSOLETE_SM,
	sizeof (obsolete_sm_object), 1, &obsolete_sm_object, tx));
	ASSERT0(vdev_obsolete_sm_object(vd, &obsolete_sm_object));
	ASSERT3U(obsolete_sm_object, !=, 0);

	spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
	VERIFY0(space_map_open(&vd->vdev_obsolete_sm,
	spa->spa_meta_objset, obsolete_sm_object,
	0, vd->vdev_asize, 0));
	}

	ASSERT(vd->vdev_obsolete_sm != NULL);
	ASSERT3U(obsolete_sm_object, ==,
	space_map_object(vd->vdev_obsolete_sm));

	space_map_write(vd->vdev_obsolete_sm,
	vd->vdev_obsolete_segments, SM_ALLOC, SM_NO_VDEVID, tx);
	range_tree_vacate(vd->vdev_obsolete_segments, NULL, NULL);
	}

	int
	spa_condense_init(spa_t *spa)
	{
	int error = zap_lookup(spa->spa_meta_objset,
	DMU_POOL_DIRECTORY_OBJECT,
	DMU_POOL_CONDENSING_INDIRECT, sizeof (uint64_t),
	sizeof (spa->spa_condensing_indirect_phys) / sizeof (uint64_t),
	&spa->spa_condensing_indirect_phys);
	if (error == 0) {
	if (spa_writeable(spa)) {
	spa->spa_condensing_indirect =
	spa_condensing_indirect_create(spa);
	}
	return (0);
	} else if (error == ENOENT) {
	return (0);
	} else {
	return (error);
	}
	}

	void
	spa_condense_fini(spa_t *spa)
	{
	if (spa->spa_condensing_indirect != NULL) {
	spa_condensing_indirect_destroy(spa->spa_condensing_indirect);
	spa->spa_condensing_indirect = NULL;
	}
	}

	void
	spa_start_indirect_condensing_thread(spa_t *spa)
	{
	ASSERT3P(spa->spa_condense_zthr, ==, NULL);
	spa->spa_condense_zthr = zthr_create("z_indirect_condense",
	spa_condense_indirect_thread_check,
	- spa_condense_indirect_thread, spa);
	+ spa_condense_indirect_thread, spa, minclsyspri);
	}

	/*
	* Gets the obsolete spacemap object from the vdev's ZAP. On success sm_obj
	* will contain either the obsolete spacemap object or zero if none exists.
	* All other errors are returned to the caller.
	*/
	int
	vdev_obsolete_sm_object(vdev_t vd, uint64_t sm_obj)
	{
	ASSERT0(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER));

	if (vd->vdev_top_zap == 0) {
	*sm_obj = 0;
	return (0);
	}

	int error = zap_lookup(vd->vdev_spa->spa_meta_objset, vd->vdev_top_zap,
	VDEV_TOP_ZAP_INDIRECT_OBSOLETE_SM, sizeof (uint64_t), 1, sm_obj);
	if (error == ENOENT) {
	*sm_obj = 0;
	error = 0;
	}

	return (error);
	}

	/*
	* Gets the obsolete count are precise spacemap object from the vdev's ZAP.
	* On success are_precise will be set to reflect if the counts are precise.
	* All other errors are returned to the caller.
	*/
	int
	vdev_obsolete_counts_are_precise(vdev_t vd, boolean_t are_precise)
	{
	ASSERT0(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER));

	if (vd->vdev_top_zap == 0) {
	*are_precise = B_FALSE;
	return (0);
	}

	uint64_t val = 0;
	int error = zap_lookup(vd->vdev_spa->spa_meta_objset, vd->vdev_top_zap,
	VDEV_TOP_ZAP_OBSOLETE_COUNTS_ARE_PRECISE, sizeof (val), 1, &val);
	if (error == 0) {
	*are_precise = (val != 0);
	} else if (error == ENOENT) {
	*are_precise = B_FALSE;
	error = 0;
	}

	return (error);
	}

	/* ARGSUSED */
	static void
	vdev_indirect_close(vdev_t *vd)
	{
	}

	/* ARGSUSED */
	static int
	vdev_indirect_open(vdev_t vd, uint64_t psize, uint64_t *max_psize,
	uint64_t logical_ashift, uint64_t physical_ashift)
	{
	psize = max_psize = vd->vdev_asize +
	VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE;
	*logical_ashift = vd->vdev_ashift;
	*physical_ashift = vd->vdev_physical_ashift;
	return (0);
	}

	typedef struct remap_segment {
	vdev_t *rs_vd;
	uint64_t rs_offset;
	uint64_t rs_asize;
	uint64_t rs_split_offset;
	list_node_t rs_node;
	} remap_segment_t;

	static remap_segment_t *
	rs_alloc(vdev_t *vd, uint64_t offset, uint64_t asize, uint64_t split_offset)
	{
	remap_segment_t *rs = kmem_alloc(sizeof (remap_segment_t), KM_SLEEP);
	rs->rs_vd = vd;
	rs->rs_offset = offset;
	rs->rs_asize = asize;
	rs->rs_split_offset = split_offset;
	return (rs);
	}

	/*
	* Given an indirect vdev and an extent on that vdev, it duplicates the
	* physical entries of the indirect mapping that correspond to the extent
	* to a new array and returns a pointer to it. In addition, copied_entries
	* is populated with the number of mapping entries that were duplicated.
	*
	* Note that the function assumes that the caller holds vdev_indirect_rwlock.
	* This ensures that the mapping won't change due to condensing as we
	* copy over its contents.
	*
	* Finally, since we are doing an allocation, it is up to the caller to
	* free the array allocated in this function.
	*/
	static vdev_indirect_mapping_entry_phys_t *
	vdev_indirect_mapping_duplicate_adjacent_entries(vdev_t *vd, uint64_t offset,
	uint64_t asize, uint64_t *copied_entries)
	{
	vdev_indirect_mapping_entry_phys_t *duplicate_mappings = NULL;
	vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
	uint64_t entries = 0;

	ASSERT(RW_READ_HELD(&vd->vdev_indirect_rwlock));

	vdev_indirect_mapping_entry_phys_t *first_mapping =
	vdev_indirect_mapping_entry_for_offset(vim, offset);
	ASSERT3P(first_mapping, !=, NULL);

	vdev_indirect_mapping_entry_phys_t *m = first_mapping;
	while (asize > 0) {
	uint64_t size = DVA_GET_ASIZE(&m->vimep_dst);

	ASSERT3U(offset, >=, DVA_MAPPING_GET_SRC_OFFSET(m));
	ASSERT3U(offset, <, DVA_MAPPING_GET_SRC_OFFSET(m) + size);

	uint64_t inner_offset = offset - DVA_MAPPING_GET_SRC_OFFSET(m);
	uint64_t inner_size = MIN(asize, size - inner_offset);

	offset += inner_size;
	asize -= inner_size;
	entries++;
	m++;
	}

	size_t copy_length = entries * sizeof (*first_mapping);
	duplicate_mappings = kmem_alloc(copy_length, KM_SLEEP);
	bcopy(first_mapping, duplicate_mappings, copy_length);
	*copied_entries = entries;

	return (duplicate_mappings);
	}

	/*
	* Goes through the relevant indirect mappings until it hits a concrete vdev
	* and issues the callback. On the way to the concrete vdev, if any other
	* indirect vdevs are encountered, then the callback will also be called on
	* each of those indirect vdevs. For example, if the segment is mapped to
	* segment A on indirect vdev 1, and then segment A on indirect vdev 1 is
	* mapped to segment B on concrete vdev 2, then the callback will be called on
	* both vdev 1 and vdev 2.
	*
	* While the callback passed to vdev_indirect_remap() is called on every vdev
	* the function encounters, certain callbacks only care about concrete vdevs.
	* These types of callbacks should return immediately and explicitly when they
	* are called on an indirect vdev.
	*
	* Because there is a possibility that a DVA section in the indirect device
	* has been split into multiple sections in our mapping, we keep track
	* of the relevant contiguous segments of the new location (remap_segment_t)
	* in a stack. This way we can call the callback for each of the new sections
	* created by a single section of the indirect device. Note though, that in
	* this scenario the callbacks in each split block won't occur in-order in
	* terms of offset, so callers should not make any assumptions about that.
	*
	* For callbacks that don't handle split blocks and immediately return when
	* they encounter them (as is the case for remap_blkptr_cb), the caller can
	* assume that its callback will be applied from the first indirect vdev
	* encountered to the last one and then the concrete vdev, in that order.
	*/
	static void
	vdev_indirect_remap(vdev_t *vd, uint64_t offset, uint64_t asize,
	void (func)(uint64_t, vdev_t , uint64_t, uint64_t, void ), void arg)
	{
	list_t stack;
	spa_t *spa = vd->vdev_spa;

	list_create(&stack, sizeof (remap_segment_t),
	offsetof(remap_segment_t, rs_node));

	for (remap_segment_t *rs = rs_alloc(vd, offset, asize, 0);
	rs != NULL; rs = list_remove_head(&stack)) {
	vdev_t *v = rs->rs_vd;
	uint64_t num_entries = 0;

	ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
	ASSERT(rs->rs_asize > 0);

	/*
	* Note: As this function can be called from open context
	* (e.g. zio_read()), we need the following rwlock to
	* prevent the mapping from being changed by condensing.
	*
	* So we grab the lock and we make a copy of the entries
	* that are relevant to the extent that we are working on.
	* Once that is done, we drop the lock and iterate over
	* our copy of the mapping. Once we are done with the with
	* the remap segment and we free it, we also free our copy
	* of the indirect mapping entries that are relevant to it.
	*
	* This way we don't need to wait until the function is
	* finished with a segment, to condense it. In addition, we
	* don't need a recursive rwlock for the case that a call to
	* vdev_indirect_remap() needs to call itself (through the
	* codepath of its callback) for the same vdev in the middle
	* of its execution.
	*/
	rw_enter(&v->vdev_indirect_rwlock, RW_READER);
	ASSERT3P(v->vdev_indirect_mapping, !=, NULL);

	vdev_indirect_mapping_entry_phys_t *mapping =
	vdev_indirect_mapping_duplicate_adjacent_entries(v,
	rs->rs_offset, rs->rs_asize, &num_entries);
	ASSERT3P(mapping, !=, NULL);
	ASSERT3U(num_entries, >, 0);
	rw_exit(&v->vdev_indirect_rwlock);

	for (uint64_t i = 0; i < num_entries; i++) {
	/*
	* Note: the vdev_indirect_mapping can not change
	* while we are running. It only changes while the
	* removal is in progress, and then only from syncing
	* context. While a removal is in progress, this
	* function is only called for frees, which also only
	* happen from syncing context.
	*/
	vdev_indirect_mapping_entry_phys_t *m = &mapping[i];

	ASSERT3P(m, !=, NULL);
	ASSERT3U(rs->rs_asize, >, 0);

	uint64_t size = DVA_GET_ASIZE(&m->vimep_dst);
	uint64_t dst_offset = DVA_GET_OFFSET(&m->vimep_dst);
	uint64_t dst_vdev = DVA_GET_VDEV(&m->vimep_dst);

	ASSERT3U(rs->rs_offset, >=,
	DVA_MAPPING_GET_SRC_OFFSET(m));
	ASSERT3U(rs->rs_offset, <,
	DVA_MAPPING_GET_SRC_OFFSET(m) + size);
	ASSERT3U(dst_vdev, !=, v->vdev_id);

	uint64_t inner_offset = rs->rs_offset -
	DVA_MAPPING_GET_SRC_OFFSET(m);
	uint64_t inner_size =
	MIN(rs->rs_asize, size - inner_offset);

	vdev_t *dst_v = vdev_lookup_top(spa, dst_vdev);
	ASSERT3P(dst_v, !=, NULL);

	if (dst_v->vdev_ops == &vdev_indirect_ops) {
	list_insert_head(&stack,
	rs_alloc(dst_v, dst_offset + inner_offset,
	inner_size, rs->rs_split_offset));

	}

	if ((zfs_flags & ZFS_DEBUG_INDIRECT_REMAP) &&
	IS_P2ALIGNED(inner_size, 2 * SPA_MINBLOCKSIZE)) {
	/*
	* Note: This clause exists only solely for
	* testing purposes. We use it to ensure that
	* split blocks work and that the callbacks
	* using them yield the same result if issued
	* in reverse order.
	*/
	uint64_t inner_half = inner_size / 2;

	func(rs->rs_split_offset + inner_half, dst_v,
	dst_offset + inner_offset + inner_half,
	inner_half, arg);

	func(rs->rs_split_offset, dst_v,
	dst_offset + inner_offset,
	inner_half, arg);
	} else {
	func(rs->rs_split_offset, dst_v,
	dst_offset + inner_offset,
	inner_size, arg);
	}

	rs->rs_offset += inner_size;
	rs->rs_asize -= inner_size;
	rs->rs_split_offset += inner_size;
	}
	VERIFY0(rs->rs_asize);

	kmem_free(mapping, num_entries * sizeof (*mapping));
	kmem_free(rs, sizeof (remap_segment_t));
	}
	list_destroy(&stack);
	}

	static void
	vdev_indirect_child_io_done(zio_t *zio)
	{
	zio_t *pio = zio->io_private;

	mutex_enter(&pio->io_lock);
	pio->io_error = zio_worst_error(pio->io_error, zio->io_error);
	mutex_exit(&pio->io_lock);

	abd_free(zio->io_abd);
	}

	/*
	* This is a callback for vdev_indirect_remap() which allocates an
	* indirect_split_t for each split segment and adds it to iv_splits.
	*/
	static void
	vdev_indirect_gather_splits(uint64_t split_offset, vdev_t *vd, uint64_t offset,
	uint64_t size, void *arg)
	{
	zio_t *zio = arg;
	indirect_vsd_t *iv = zio->io_vsd;

	ASSERT3P(vd, !=, NULL);

	if (vd->vdev_ops == &vdev_indirect_ops)
	return;

	int n = 1;
	if (vd->vdev_ops == &vdev_mirror_ops)
	n = vd->vdev_children;

	indirect_split_t *is =
	kmem_zalloc(offsetof(indirect_split_t, is_child[n]), KM_SLEEP);

	is->is_children = n;
	is->is_size = size;
	is->is_split_offset = split_offset;
	is->is_target_offset = offset;
	is->is_vdev = vd;
	list_create(&is->is_unique_child, sizeof (indirect_child_t),
	offsetof(indirect_child_t, ic_node));

	/*
	* Note that we only consider multiple copies of the data for
	* mirror vdevs. We don't for "replacing" or "spare" vdevs, even
	* though they use the same ops as mirror, because there's only one
	* "good" copy under the replacing/spare.
	*/
	if (vd->vdev_ops == &vdev_mirror_ops) {
	for (int i = 0; i < n; i++) {
	is->is_child[i].ic_vdev = vd->vdev_child[i];
	list_link_init(&is->is_child[i].ic_node);
	}
	} else {
	is->is_child[0].ic_vdev = vd;
	}

	list_insert_tail(&iv->iv_splits, is);
	}

	static void
	vdev_indirect_read_split_done(zio_t *zio)
	{
	indirect_child_t *ic = zio->io_private;

	if (zio->io_error != 0) {
	/*
	* Clear ic_data to indicate that we do not have data for this
	* child.
	*/
	abd_free(ic->ic_data);
	ic->ic_data = NULL;
	}
	}

	/*
	* Issue reads for all copies (mirror children) of all splits.
	*/
	static void
	vdev_indirect_read_all(zio_t *zio)
	{
	indirect_vsd_t *iv = zio->io_vsd;

	ASSERT3U(zio->io_type, ==, ZIO_TYPE_READ);

	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	for (int i = 0; i < is->is_children; i++) {
	indirect_child_t *ic = &is->is_child[i];

	if (!vdev_readable(ic->ic_vdev))
	continue;

	/*
	* If a child is missing the data, set ic_error. Used
	* in vdev_indirect_repair(). We perform the read
	* nevertheless which provides the opportunity to
	* reconstruct the split block if at all possible.
	*/
	if (vdev_dtl_contains(ic->ic_vdev, DTL_MISSING,
	zio->io_txg, 1))
	ic->ic_error = SET_ERROR(ESTALE);

	ic->ic_data = abd_alloc_sametype(zio->io_abd,
	is->is_size);
	ic->ic_duplicate = NULL;

	zio_nowait(zio_vdev_child_io(zio, NULL,
	ic->ic_vdev, is->is_target_offset, ic->ic_data,
	is->is_size, zio->io_type, zio->io_priority, 0,
	vdev_indirect_read_split_done, ic));
	}
	}
	iv->iv_reconstruct = B_TRUE;
	}

	static void
	vdev_indirect_io_start(zio_t *zio)
	{
	spa_t *spa __maybe_unused = zio->io_spa;
	indirect_vsd_t iv = kmem_zalloc(sizeof (iv), KM_SLEEP);
	list_create(&iv->iv_splits,
	sizeof (indirect_split_t), offsetof(indirect_split_t, is_node));

	zio->io_vsd = iv;
	zio->io_vsd_ops = &vdev_indirect_vsd_ops;

	ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
	if (zio->io_type != ZIO_TYPE_READ) {
	ASSERT3U(zio->io_type, ==, ZIO_TYPE_WRITE);
	/*
	* Note: this code can handle other kinds of writes,
	* but we don't expect them.
	*/
	ASSERT((zio->io_flags & (ZIO_FLAG_SELF_HEAL \|
	ZIO_FLAG_RESILVER \| ZIO_FLAG_INDUCE_DAMAGE)) != 0);
	}

	vdev_indirect_remap(zio->io_vd, zio->io_offset, zio->io_size,
	vdev_indirect_gather_splits, zio);

	indirect_split_t *first = list_head(&iv->iv_splits);
	if (first->is_size == zio->io_size) {
	/*
	* This is not a split block; we are pointing to the entire
	* data, which will checksum the same as the original data.
	* Pass the BP down so that the child i/o can verify the
	* checksum, and try a different location if available
	* (e.g. on a mirror).
	*
	* While this special case could be handled the same as the
	* general (split block) case, doing it this way ensures
	* that the vast majority of blocks on indirect vdevs
	* (which are not split) are handled identically to blocks
	* on non-indirect vdevs. This allows us to be less strict
	* about performance in the general (but rare) case.
	*/
	ASSERT0(first->is_split_offset);
	ASSERT3P(list_next(&iv->iv_splits, first), ==, NULL);
	zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
	first->is_vdev, first->is_target_offset,
	abd_get_offset(zio->io_abd, 0),
	zio->io_size, zio->io_type, zio->io_priority, 0,
	vdev_indirect_child_io_done, zio));
	} else {
	iv->iv_split_block = B_TRUE;
	if (zio->io_type == ZIO_TYPE_READ &&
	zio->io_flags & (ZIO_FLAG_SCRUB \| ZIO_FLAG_RESILVER)) {
	/*
	* Read all copies. Note that for simplicity,
	* we don't bother consulting the DTL in the
	* resilver case.
	*/
	vdev_indirect_read_all(zio);
	} else {
	/*
	* If this is a read zio, we read one copy of each
	* split segment, from the top-level vdev. Since
	* we don't know the checksum of each split
	* individually, the child zio can't ensure that
	* we get the right data. E.g. if it's a mirror,
	* it will just read from a random (healthy) leaf
	* vdev. We have to verify the checksum in
	* vdev_indirect_io_done().
	*
	* For write zios, the vdev code will ensure we write
	* to all children.
	*/
	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	zio_nowait(zio_vdev_child_io(zio, NULL,
	is->is_vdev, is->is_target_offset,
	abd_get_offset(zio->io_abd,
	is->is_split_offset), is->is_size,
	zio->io_type, zio->io_priority, 0,
	vdev_indirect_child_io_done, zio));
	}

	}
	}

	zio_execute(zio);
	}

	/*
	* Report a checksum error for a child.
	*/
	static void
	vdev_indirect_checksum_error(zio_t *zio,
	indirect_split_t is, indirect_child_t ic)
	{
	vdev_t *vd = ic->ic_vdev;

	if (zio->io_flags & ZIO_FLAG_SPECULATIVE)
	return;

	mutex_enter(&vd->vdev_stat_lock);
	vd->vdev_stat.vs_checksum_errors++;
	mutex_exit(&vd->vdev_stat_lock);

	zio_bad_cksum_t zbc = {{{ 0 }}};
	abd_t *bad_abd = ic->ic_data;
	abd_t *good_abd = is->is_good_child->ic_data;
	(void) zfs_ereport_post_checksum(zio->io_spa, vd, NULL, zio,
	is->is_target_offset, is->is_size, good_abd, bad_abd, &zbc);
	}

	/*
	* Issue repair i/os for any incorrect copies. We do this by comparing
	* each split segment's correct data (is_good_child's ic_data) with each
	* other copy of the data. If they differ, then we overwrite the bad data
	* with the good copy. The DTL is checked in vdev_indirect_read_all() and
	* if a vdev is missing a copy of the data we set ic_error and the read is
	* performed. This provides the opportunity to reconstruct the split block
	* if at all possible. ic_error is checked here and if set it suppresses
	* incrementing the checksum counter. Aside from this DTLs are not checked,
	* which simplifies this code and also issues the optimal number of writes
	* (based on which copies actually read bad data, as opposed to which we
	* think might be wrong). For the same reason, we always use
	* ZIO_FLAG_SELF_HEAL, to bypass the DTL check in zio_vdev_io_start().
	*/
	static void
	vdev_indirect_repair(zio_t *zio)
	{
	indirect_vsd_t *iv = zio->io_vsd;

	enum zio_flag flags = ZIO_FLAG_IO_REPAIR;

	if (!(zio->io_flags & (ZIO_FLAG_SCRUB \| ZIO_FLAG_RESILVER)))
	flags \|= ZIO_FLAG_SELF_HEAL;

	if (!spa_writeable(zio->io_spa))
	return;

	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	for (int c = 0; c < is->is_children; c++) {
	indirect_child_t *ic = &is->is_child[c];
	if (ic == is->is_good_child)
	continue;
	if (ic->ic_data == NULL)
	continue;
	if (ic->ic_duplicate == is->is_good_child)
	continue;

	zio_nowait(zio_vdev_child_io(zio, NULL,
	ic->ic_vdev, is->is_target_offset,
	is->is_good_child->ic_data, is->is_size,
	ZIO_TYPE_WRITE, ZIO_PRIORITY_ASYNC_WRITE,
	ZIO_FLAG_IO_REPAIR \| ZIO_FLAG_SELF_HEAL,
	NULL, NULL));

	/*
	* If ic_error is set the current child does not have
	* a copy of the data, so suppress incrementing the
	* checksum counter.
	*/
	if (ic->ic_error == ESTALE)
	continue;

	vdev_indirect_checksum_error(zio, is, ic);
	}
	}
	}

	/*
	* Report checksum errors on all children that we read from.
	*/
	static void
	vdev_indirect_all_checksum_errors(zio_t *zio)
	{
	indirect_vsd_t *iv = zio->io_vsd;

	if (zio->io_flags & ZIO_FLAG_SPECULATIVE)
	return;

	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	for (int c = 0; c < is->is_children; c++) {
	indirect_child_t *ic = &is->is_child[c];

	if (ic->ic_data == NULL)
	continue;

	vdev_t *vd = ic->ic_vdev;

	(void) zfs_ereport_post_checksum(zio->io_spa, vd,
	NULL, zio, is->is_target_offset, is->is_size,
	NULL, NULL, NULL);
	mutex_enter(&vd->vdev_stat_lock);
	vd->vdev_stat.vs_checksum_errors++;
	mutex_exit(&vd->vdev_stat_lock);
	}
	}
	}

	/*
	* Copy data from all the splits to a main zio then validate the checksum.
	* If then checksum is successfully validated return success.
	*/
	static int
	vdev_indirect_splits_checksum_validate(indirect_vsd_t iv, zio_t zio)
	{
	zio_bad_cksum_t zbc;

	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {

	ASSERT3P(is->is_good_child->ic_data, !=, NULL);
	ASSERT3P(is->is_good_child->ic_duplicate, ==, NULL);

	abd_copy_off(zio->io_abd, is->is_good_child->ic_data,
	is->is_split_offset, 0, is->is_size);
	}

	return (zio_checksum_error(zio, &zbc));
	}

	/*
	* There are relatively few possible combinations making it feasible to
	* deterministically check them all. We do this by setting the good_child
	* to the next unique split version. If we reach the end of the list then
	* "carry over" to the next unique split version (like counting in base
	* is_unique_children, but each digit can have a different base).
	*/
	static int
	vdev_indirect_splits_enumerate_all(indirect_vsd_t iv, zio_t zio)
	{
	boolean_t more = B_TRUE;

	iv->iv_attempts = 0;

	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is))
	is->is_good_child = list_head(&is->is_unique_child);

	while (more == B_TRUE) {
	iv->iv_attempts++;
	more = B_FALSE;

	if (vdev_indirect_splits_checksum_validate(iv, zio) == 0)
	return (0);

	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	is->is_good_child = list_next(&is->is_unique_child,
	is->is_good_child);
	if (is->is_good_child != NULL) {
	more = B_TRUE;
	break;
	}

	is->is_good_child = list_head(&is->is_unique_child);
	}
	}

	ASSERT3S(iv->iv_attempts, <=, iv->iv_unique_combinations);

	return (SET_ERROR(ECKSUM));
	}

	/*
	* There are too many combinations to try all of them in a reasonable amount
	* of time. So try a fixed number of random combinations from the unique
	* split versions, after which we'll consider the block unrecoverable.
	*/
	static int
	vdev_indirect_splits_enumerate_randomly(indirect_vsd_t iv, zio_t zio)
	{
	iv->iv_attempts = 0;

	while (iv->iv_attempts < iv->iv_attempts_max) {
	iv->iv_attempts++;

	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	indirect_child_t *ic = list_head(&is->is_unique_child);
	int children = is->is_unique_children;

	- for (int i = spa_get_random(children); i > 0; i--)
	+ for (int i = random_in_range(children); i > 0; i--)
	ic = list_next(&is->is_unique_child, ic);

	ASSERT3P(ic, !=, NULL);
	is->is_good_child = ic;
	}

	if (vdev_indirect_splits_checksum_validate(iv, zio) == 0)
	return (0);
	}

	return (SET_ERROR(ECKSUM));
	}

	/*
	* This is a validation function for reconstruction. It randomly selects
	* a good combination, if one can be found, and then it intentionally
	* damages all other segment copes by zeroing them. This forces the
	* reconstruction algorithm to locate the one remaining known good copy.
	*/
	static int
	vdev_indirect_splits_damage(indirect_vsd_t iv, zio_t zio)
	{
	int error;

	/* Presume all the copies are unique for initial selection. */
	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	is->is_unique_children = 0;

	for (int i = 0; i < is->is_children; i++) {
	indirect_child_t *ic = &is->is_child[i];
	if (ic->ic_data != NULL) {
	is->is_unique_children++;
	list_insert_tail(&is->is_unique_child, ic);
	}
	}

	if (list_is_empty(&is->is_unique_child)) {
	error = SET_ERROR(EIO);
	goto out;
	}
	}

	/*
	* Set each is_good_child to a randomly-selected child which
	* is known to contain validated data.
	*/
	error = vdev_indirect_splits_enumerate_randomly(iv, zio);
	if (error)
	goto out;

	/*
	* Damage all but the known good copy by zeroing it. This will
	* result in two or less unique copies per indirect_child_t.
	* Both may need to be checked in order to reconstruct the block.
	* Set iv->iv_attempts_max such that all unique combinations will
	* enumerated, but limit the damage to at most 12 indirect splits.
	*/
	iv->iv_attempts_max = 1;

	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	for (int c = 0; c < is->is_children; c++) {
	indirect_child_t *ic = &is->is_child[c];

	if (ic == is->is_good_child)
	continue;
	if (ic->ic_data == NULL)
	continue;

	abd_zero(ic->ic_data, abd_get_size(ic->ic_data));
	}

	iv->iv_attempts_max *= 2;
	if (iv->iv_attempts_max >= (1ULL << 12)) {
	iv->iv_attempts_max = UINT64_MAX;
	break;
	}
	}

	out:
	/* Empty the unique children lists so they can be reconstructed. */
	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	indirect_child_t *ic;
	while ((ic = list_head(&is->is_unique_child)) != NULL)
	list_remove(&is->is_unique_child, ic);

	is->is_unique_children = 0;
	}

	return (error);
	}

	/*
	* This function is called when we have read all copies of the data and need
	* to try to find a combination of copies that gives us the right checksum.
	*
	* If we pointed to any mirror vdevs, this effectively does the job of the
	* mirror. The mirror vdev code can't do its own job because we don't know
	* the checksum of each split segment individually.
	*
	* We have to try every unique combination of copies of split segments, until
	* we find one that checksums correctly. Duplicate segment copies are first
	* identified and latter skipped during reconstruction. This optimization
	* reduces the search space and ensures that of the remaining combinations
	* at most one is correct.
	*
	* When the total number of combinations is small they can all be checked.
	* For example, if we have 3 segments in the split, and each points to a
	* 2-way mirror with unique copies, we will have the following pieces of data:
	*
	* \| mirror child
	* split \| [0] [1]
	* ======\|=====================
	* A \| data_A_0 data_A_1
	* B \| data_B_0 data_B_1
	* C \| data_C_0 data_C_1
	*
	* We will try the following (mirror children)^(number of splits) (2^3=8)
	* combinations, which is similar to bitwise-little-endian counting in
	* binary. In general each "digit" corresponds to a split segment, and the
	* base of each digit is is_children, which can be different for each
	* digit.
	*
	* "low bit" "high bit"
	* v v
	* data_A_0 data_B_0 data_C_0
	* data_A_1 data_B_0 data_C_0
	* data_A_0 data_B_1 data_C_0
	* data_A_1 data_B_1 data_C_0
	* data_A_0 data_B_0 data_C_1
	* data_A_1 data_B_0 data_C_1
	* data_A_0 data_B_1 data_C_1
	* data_A_1 data_B_1 data_C_1
	*
	* Note that the split segments may be on the same or different top-level
	* vdevs. In either case, we may need to try lots of combinations (see
	* zfs_reconstruct_indirect_combinations_max). This ensures that if a mirror
	* has small silent errors on all of its children, we can still reconstruct
	* the correct data, as long as those errors are at sufficiently-separated
	* offsets (specifically, separated by the largest block size - default of
	* 128KB, but up to 16MB).
	*/
	static void
	vdev_indirect_reconstruct_io_done(zio_t *zio)
	{
	indirect_vsd_t *iv = zio->io_vsd;
	boolean_t known_good = B_FALSE;
	int error;

	iv->iv_unique_combinations = 1;
	iv->iv_attempts_max = UINT64_MAX;

	if (zfs_reconstruct_indirect_combinations_max > 0)
	iv->iv_attempts_max = zfs_reconstruct_indirect_combinations_max;

	/*
	* If nonzero, every 1/x blocks will be damaged, in order to validate
	* reconstruction when there are split segments with damaged copies.
	* Known_good will be TRUE when reconstruction is known to be possible.
	*/
	if (zfs_reconstruct_indirect_damage_fraction != 0 &&
	- spa_get_random(zfs_reconstruct_indirect_damage_fraction) == 0)
	+ random_in_range(zfs_reconstruct_indirect_damage_fraction) == 0)
	known_good = (vdev_indirect_splits_damage(iv, zio) == 0);

	/*
	* Determine the unique children for a split segment and add them
	* to the is_unique_child list. By restricting reconstruction
	* to these children, only unique combinations will be considered.
	* This can vastly reduce the search space when there are a large
	* number of indirect splits.
	*/
	for (indirect_split_t *is = list_head(&iv->iv_splits);
	is != NULL; is = list_next(&iv->iv_splits, is)) {
	is->is_unique_children = 0;

	for (int i = 0; i < is->is_children; i++) {
	indirect_child_t *ic_i = &is->is_child[i];

	if (ic_i->ic_data == NULL \|\|
	ic_i->ic_duplicate != NULL)
	continue;

	for (int j = i + 1; j < is->is_children; j++) {
	indirect_child_t *ic_j = &is->is_child[j];

	if (ic_j->ic_data == NULL \|\|
	ic_j->ic_duplicate != NULL)
	continue;

	if (abd_cmp(ic_i->ic_data, ic_j->ic_data) == 0)
	ic_j->ic_duplicate = ic_i;
	}

	is->is_unique_children++;
	list_insert_tail(&is->is_unique_child, ic_i);
	}

	/* Reconstruction is impossible, no valid children */
	EQUIV(list_is_empty(&is->is_unique_child),
	is->is_unique_children == 0);
	if (list_is_empty(&is->is_unique_child)) {
	zio->io_error = EIO;
	vdev_indirect_all_checksum_errors(zio);
	zio_checksum_verified(zio);
	return;
	}

	iv->iv_unique_combinations *= is->is_unique_children;
	}

	if (iv->iv_unique_combinations <= iv->iv_attempts_max)
	error = vdev_indirect_splits_enumerate_all(iv, zio);
	else
	error = vdev_indirect_splits_enumerate_randomly(iv, zio);

	if (error != 0) {
	/* All attempted combinations failed. */
	ASSERT3B(known_good, ==, B_FALSE);
	zio->io_error = error;
	vdev_indirect_all_checksum_errors(zio);
	} else {
	/*
	* The checksum has been successfully validated. Issue
	* repair I/Os to any copies of splits which don't match
	* the validated version.
	*/
	ASSERT0(vdev_indirect_splits_checksum_validate(iv, zio));
	vdev_indirect_repair(zio);
	zio_checksum_verified(zio);
	}
	}

	static void
	vdev_indirect_io_done(zio_t *zio)
	{
	indirect_vsd_t *iv = zio->io_vsd;

	if (iv->iv_reconstruct) {
	/*
	* We have read all copies of the data (e.g. from mirrors),
	* either because this was a scrub/resilver, or because the
	* one-copy read didn't checksum correctly.
	*/
	vdev_indirect_reconstruct_io_done(zio);
	return;
	}

	if (!iv->iv_split_block) {
	/*
	* This was not a split block, so we passed the BP down,
	* and the checksum was handled by the (one) child zio.
	*/
	return;
	}

	zio_bad_cksum_t zbc;
	int ret = zio_checksum_error(zio, &zbc);
	if (ret == 0) {
	zio_checksum_verified(zio);
	return;
	}

	/*
	* The checksum didn't match. Read all copies of all splits, and
	* then we will try to reconstruct. The next time
	* vdev_indirect_io_done() is called, iv_reconstruct will be set.
	*/
	vdev_indirect_read_all(zio);

	zio_vdev_io_redone(zio);
	}

	vdev_ops_t vdev_indirect_ops = {
	.vdev_op_init = NULL,
	.vdev_op_fini = NULL,
	.vdev_op_open = vdev_indirect_open,
	.vdev_op_close = vdev_indirect_close,
	.vdev_op_asize = vdev_default_asize,
	.vdev_op_min_asize = vdev_default_min_asize,
	.vdev_op_min_alloc = NULL,
	.vdev_op_io_start = vdev_indirect_io_start,
	.vdev_op_io_done = vdev_indirect_io_done,
	.vdev_op_state_change = NULL,
	.vdev_op_need_resilver = NULL,
	.vdev_op_hold = NULL,
	.vdev_op_rele = NULL,
	.vdev_op_remap = vdev_indirect_remap,
	.vdev_op_xlate = NULL,
	.vdev_op_rebuild_asize = NULL,
	.vdev_op_metaslab_init = NULL,
	.vdev_op_config_generate = NULL,
	.vdev_op_nparity = NULL,
	.vdev_op_ndisks = NULL,
	.vdev_op_type = VDEV_TYPE_INDIRECT, /* name of this vdev type */
	.vdev_op_leaf = B_FALSE /* leaf vdev */
	};

	EXPORT_SYMBOL(spa_condense_fini);
	EXPORT_SYMBOL(spa_start_indirect_condensing_thread);
	EXPORT_SYMBOL(spa_condense_indirect_start_sync);
	EXPORT_SYMBOL(spa_condense_init);
	EXPORT_SYMBOL(spa_vdev_indirect_mark_obsolete);
	EXPORT_SYMBOL(vdev_indirect_mark_obsolete);
	EXPORT_SYMBOL(vdev_indirect_should_condense);
	EXPORT_SYMBOL(vdev_indirect_sync_obsolete);
	EXPORT_SYMBOL(vdev_obsolete_counts_are_precise);
	EXPORT_SYMBOL(vdev_obsolete_sm_object);

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_condense, zfs_condense_, indirect_vdevs_enable, INT, ZMOD_RW,
	"Whether to attempt condensing indirect vdev mappings");

	ZFS_MODULE_PARAM(zfs_condense, zfs_condense_, indirect_obsolete_pct, INT, ZMOD_RW,
	"Minimum obsolete percent of bytes in the mapping to attempt condensing");

	ZFS_MODULE_PARAM(zfs_condense, zfs_condense_, min_mapping_bytes, ULONG, ZMOD_RW,
	"Don't bother condensing if the mapping uses less than this amount of "
	"memory");

	ZFS_MODULE_PARAM(zfs_condense, zfs_condense_, max_obsolete_bytes, ULONG, ZMOD_RW,
	"Minimum size obsolete spacemap to attempt condensing");

	ZFS_MODULE_PARAM(zfs_condense, zfs_condense_, indirect_commit_entry_delay_ms, INT, ZMOD_RW,
	"Used by tests to ensure certain actions happen in the middle of a "
	"condense. A maximum value of 1 should be sufficient.");

	ZFS_MODULE_PARAM(zfs_reconstruct, zfs_reconstruct_, indirect_combinations_max, INT, ZMOD_RW,
	"Maximum number of combinations when reconstructing split segments");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/vdev_mirror.c b/sys/contrib/openzfs/module/zfs/vdev_mirror.c
	index 106678a8708e..5eb331046953 100644
	--- a/sys/contrib/openzfs/module/zfs/vdev_mirror.c
	+++ b/sys/contrib/openzfs/module/zfs/vdev_mirror.c
	@@ -1,980 +1,980 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	/*
	* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_scan.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_draid.h>
	#include <sys/zio.h>
	#include <sys/abd.h>
	#include <sys/fs/zfs.h>

	/*
	* Vdev mirror kstats
	*/
	static kstat_t *mirror_ksp = NULL;

	typedef struct mirror_stats {
	kstat_named_t vdev_mirror_stat_rotating_linear;
	kstat_named_t vdev_mirror_stat_rotating_offset;
	kstat_named_t vdev_mirror_stat_rotating_seek;
	kstat_named_t vdev_mirror_stat_non_rotating_linear;
	kstat_named_t vdev_mirror_stat_non_rotating_seek;

	kstat_named_t vdev_mirror_stat_preferred_found;
	kstat_named_t vdev_mirror_stat_preferred_not_found;
	} mirror_stats_t;

	static mirror_stats_t mirror_stats = {
	/* New I/O follows directly the last I/O */
	{ "rotating_linear", KSTAT_DATA_UINT64 },
	/* New I/O is within zfs_vdev_mirror_rotating_seek_offset of the last */
	{ "rotating_offset", KSTAT_DATA_UINT64 },
	/* New I/O requires random seek */
	{ "rotating_seek", KSTAT_DATA_UINT64 },
	/* New I/O follows directly the last I/O (nonrot) */
	{ "non_rotating_linear", KSTAT_DATA_UINT64 },
	/* New I/O requires random seek (nonrot) */
	{ "non_rotating_seek", KSTAT_DATA_UINT64 },
	/* Preferred child vdev found */
	{ "preferred_found", KSTAT_DATA_UINT64 },
	/* Preferred child vdev not found or equal load */
	{ "preferred_not_found", KSTAT_DATA_UINT64 },

	};

	#define MIRROR_STAT(stat) (mirror_stats.stat.value.ui64)
	#define MIRROR_INCR(stat, val) atomic_add_64(&MIRROR_STAT(stat), val)
	#define MIRROR_BUMP(stat) MIRROR_INCR(stat, 1)

	void
	vdev_mirror_stat_init(void)
	{
	mirror_ksp = kstat_create("zfs", 0, "vdev_mirror_stats",
	"misc", KSTAT_TYPE_NAMED,
	sizeof (mirror_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);
	if (mirror_ksp != NULL) {
	mirror_ksp->ks_data = &mirror_stats;
	kstat_install(mirror_ksp);
	}
	}

	void
	vdev_mirror_stat_fini(void)
	{
	if (mirror_ksp != NULL) {
	kstat_delete(mirror_ksp);
	mirror_ksp = NULL;
	}
	}

	/*
	* Virtual device vector for mirroring.
	*/
	typedef struct mirror_child {
	vdev_t *mc_vd;
	uint64_t mc_offset;
	int mc_error;
	int mc_load;
	uint8_t mc_tried;
	uint8_t mc_skipped;
	uint8_t mc_speculative;
	uint8_t mc_rebuilding;
	} mirror_child_t;

	typedef struct mirror_map {
	int *mm_preferred;
	int mm_preferred_cnt;
	int mm_children;
	boolean_t mm_resilvering;
	boolean_t mm_rebuilding;
	boolean_t mm_root;
	mirror_child_t mm_child[];
	} mirror_map_t;

	static int vdev_mirror_shift = 21;

	/*
	* The load configuration settings below are tuned by default for
	* the case where all devices are of the same rotational type.
	*
	* If there is a mixture of rotating and non-rotating media, setting
	* zfs_vdev_mirror_non_rotating_seek_inc to 0 may well provide better results
	* as it will direct more reads to the non-rotating vdevs which are more likely
	* to have a higher performance.
	*/

	/* Rotating media load calculation configuration. */
	static int zfs_vdev_mirror_rotating_inc = 0;
	static int zfs_vdev_mirror_rotating_seek_inc = 5;
	static int zfs_vdev_mirror_rotating_seek_offset = 1 * 1024 * 1024;

	/* Non-rotating media load calculation configuration. */
	static int zfs_vdev_mirror_non_rotating_inc = 0;
	static int zfs_vdev_mirror_non_rotating_seek_inc = 1;

	static inline size_t
	vdev_mirror_map_size(int children)
	{
	return (offsetof(mirror_map_t, mm_child[children]) +
	sizeof (int) * children);
	}

	static inline mirror_map_t *
	vdev_mirror_map_alloc(int children, boolean_t resilvering, boolean_t root)
	{
	mirror_map_t *mm;

	mm = kmem_zalloc(vdev_mirror_map_size(children), KM_SLEEP);
	mm->mm_children = children;
	mm->mm_resilvering = resilvering;
	mm->mm_root = root;
	mm->mm_preferred = (int *)((uintptr_t)mm +
	offsetof(mirror_map_t, mm_child[children]));

	return (mm);
	}

	static void
	vdev_mirror_map_free(zio_t *zio)
	{
	mirror_map_t *mm = zio->io_vsd;

	kmem_free(mm, vdev_mirror_map_size(mm->mm_children));
	}

	static const zio_vsd_ops_t vdev_mirror_vsd_ops = {
	.vsd_free = vdev_mirror_map_free,
	};

	static int
	vdev_mirror_load(mirror_map_t mm, vdev_t vd, uint64_t zio_offset)
	{
	uint64_t last_offset;
	int64_t offset_diff;
	int load;

	/* All DVAs have equal weight at the root. */
	if (mm->mm_root)
	return (INT_MAX);

	/*
	* We don't return INT_MAX if the device is resilvering i.e.
	* vdev_resilver_txg != 0 as when tested performance was slightly
	* worse overall when resilvering with compared to without.
	*/

	/* Fix zio_offset for leaf vdevs */
	if (vd->vdev_ops->vdev_op_leaf)
	zio_offset += VDEV_LABEL_START_SIZE;

	/* Standard load based on pending queue length. */
	load = vdev_queue_length(vd);
	last_offset = vdev_queue_last_offset(vd);

	if (vd->vdev_nonrot) {
	/* Non-rotating media. */
	if (last_offset == zio_offset) {
	MIRROR_BUMP(vdev_mirror_stat_non_rotating_linear);
	return (load + zfs_vdev_mirror_non_rotating_inc);
	}

	/*
	* Apply a seek penalty even for non-rotating devices as
	* sequential I/O's can be aggregated into fewer operations on
	* the device, thus avoiding unnecessary per-command overhead
	* and boosting performance.
	*/
	MIRROR_BUMP(vdev_mirror_stat_non_rotating_seek);
	return (load + zfs_vdev_mirror_non_rotating_seek_inc);
	}

	/* Rotating media I/O's which directly follow the last I/O. */
	if (last_offset == zio_offset) {
	MIRROR_BUMP(vdev_mirror_stat_rotating_linear);
	return (load + zfs_vdev_mirror_rotating_inc);
	}

	/*
	* Apply half the seek increment to I/O's within seek offset
	* of the last I/O issued to this vdev as they should incur less
	* of a seek increment.
	*/
	offset_diff = (int64_t)(last_offset - zio_offset);
	if (ABS(offset_diff) < zfs_vdev_mirror_rotating_seek_offset) {
	MIRROR_BUMP(vdev_mirror_stat_rotating_offset);
	return (load + (zfs_vdev_mirror_rotating_seek_inc / 2));
	}

	/* Apply the full seek increment to all other I/O's. */
	MIRROR_BUMP(vdev_mirror_stat_rotating_seek);
	return (load + zfs_vdev_mirror_rotating_seek_inc);
	}

	static boolean_t
	vdev_mirror_rebuilding(vdev_t *vd)
	{
	if (vd->vdev_ops->vdev_op_leaf && vd->vdev_rebuild_txg)
	return (B_TRUE);

	for (int i = 0; i < vd->vdev_children; i++) {
	if (vdev_mirror_rebuilding(vd->vdev_child[i])) {
	return (B_TRUE);
	}
	}

	return (B_FALSE);
	}

	/*
	* Avoid inlining the function to keep vdev_mirror_io_start(), which
	* is this functions only caller, as small as possible on the stack.
	*/
	noinline static mirror_map_t *
	vdev_mirror_map_init(zio_t *zio)
	{
	mirror_map_t *mm = NULL;
	mirror_child_t *mc;
	vdev_t *vd = zio->io_vd;
	int c;

	if (vd == NULL) {
	dva_t *dva = zio->io_bp->blk_dva;
	spa_t *spa = zio->io_spa;
	dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
	dva_t dva_copy[SPA_DVAS_PER_BP];

	/*
	* The sequential scrub code sorts and issues all DVAs
	* of a bp separately. Each of these IOs includes all
	* original DVA copies so that repairs can be performed
	* in the event of an error, but we only actually want
	* to check the first DVA since the others will be
	* checked by their respective sorted IOs. Only if we
	* hit an error will we try all DVAs upon retrying.
	*
	* Note: This check is safe even if the user switches
	* from a legacy scrub to a sequential one in the middle
	* of processing, since scn_is_sorted isn't updated until
	* all outstanding IOs from the previous scrub pass
	* complete.
	*/
	if ((zio->io_flags & ZIO_FLAG_SCRUB) &&
	!(zio->io_flags & ZIO_FLAG_IO_RETRY) &&
	dsl_scan_scrubbing(spa->spa_dsl_pool) &&
	scn->scn_is_sorted) {
	c = 1;
	} else {
	c = BP_GET_NDVAS(zio->io_bp);
	}

	/*
	* If the pool cannot be written to, then infer that some
	* DVAs might be invalid or point to vdevs that do not exist.
	* We skip them.
	*/
	if (!spa_writeable(spa)) {
	ASSERT3U(zio->io_type, ==, ZIO_TYPE_READ);
	int j = 0;
	for (int i = 0; i < c; i++) {
	if (zfs_dva_valid(spa, &dva[i], zio->io_bp))
	dva_copy[j++] = dva[i];
	}
	if (j == 0) {
	zio->io_vsd = NULL;
	zio->io_error = ENXIO;
	return (NULL);
	}
	if (j < c) {
	dva = dva_copy;
	c = j;
	}
	}

	mm = vdev_mirror_map_alloc(c, B_FALSE, B_TRUE);
	for (c = 0; c < mm->mm_children; c++) {
	mc = &mm->mm_child[c];

	mc->mc_vd = vdev_lookup_top(spa, DVA_GET_VDEV(&dva[c]));
	mc->mc_offset = DVA_GET_OFFSET(&dva[c]);
	if (mc->mc_vd == NULL) {
	kmem_free(mm, vdev_mirror_map_size(
	mm->mm_children));
	zio->io_vsd = NULL;
	zio->io_error = ENXIO;
	return (NULL);
	}
	}
	} else {
	/*
	* If we are resilvering, then we should handle scrub reads
	* differently; we shouldn't issue them to the resilvering
	* device because it might not have those blocks.
	*
	* We are resilvering iff:
	* 1) We are a replacing vdev (ie our name is "replacing-1" or
	* "spare-1" or something like that), and
	* 2) The pool is currently being resilvered.
	*
	* We cannot simply check vd->vdev_resilver_txg, because it's
	* not set in this path.
	*
	* Nor can we just check our vdev_ops; there are cases (such as
	* when a user types "zpool replace pool odev spare_dev" and
	* spare_dev is in the spare list, or when a spare device is
	* automatically used to replace a DEGRADED device) when
	* resilvering is complete but both the original vdev and the
	* spare vdev remain in the pool. That behavior is intentional.
	* It helps implement the policy that a spare should be
	* automatically removed from the pool after the user replaces
	* the device that originally failed.
	*
	* If a spa load is in progress, then spa_dsl_pool may be
	* uninitialized. But we shouldn't be resilvering during a spa
	* load anyway.
	*/
	boolean_t replacing = (vd->vdev_ops == &vdev_replacing_ops \|\|
	vd->vdev_ops == &vdev_spare_ops) &&
	spa_load_state(vd->vdev_spa) == SPA_LOAD_NONE &&
	dsl_scan_resilvering(vd->vdev_spa->spa_dsl_pool);
	mm = vdev_mirror_map_alloc(vd->vdev_children, replacing,
	B_FALSE);
	for (c = 0; c < mm->mm_children; c++) {
	mc = &mm->mm_child[c];
	mc->mc_vd = vd->vdev_child[c];
	mc->mc_offset = zio->io_offset;

	if (vdev_mirror_rebuilding(mc->mc_vd))
	mm->mm_rebuilding = mc->mc_rebuilding = B_TRUE;
	}
	}

	return (mm);
	}

	static int
	vdev_mirror_open(vdev_t vd, uint64_t asize, uint64_t *max_asize,
	uint64_t logical_ashift, uint64_t physical_ashift)
	{
	int numerrors = 0;
	int lasterror = 0;

	if (vd->vdev_children == 0) {
	vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
	return (SET_ERROR(EINVAL));
	}

	vdev_open_children(vd);

	for (int c = 0; c < vd->vdev_children; c++) {
	vdev_t *cvd = vd->vdev_child[c];

	if (cvd->vdev_open_error) {
	lasterror = cvd->vdev_open_error;
	numerrors++;
	continue;
	}

	asize = MIN(asize - 1, cvd->vdev_asize - 1) + 1;
	max_asize = MIN(max_asize - 1, cvd->vdev_max_asize - 1) + 1;
	logical_ashift = MAX(logical_ashift, cvd->vdev_ashift);
	physical_ashift = MAX(physical_ashift,
	cvd->vdev_physical_ashift);
	}

	if (numerrors == vd->vdev_children) {
	if (vdev_children_are_offline(vd))
	vd->vdev_stat.vs_aux = VDEV_AUX_CHILDREN_OFFLINE;
	else
	vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;
	return (lasterror);
	}

	return (0);
	}

	static void
	vdev_mirror_close(vdev_t *vd)
	{
	for (int c = 0; c < vd->vdev_children; c++)
	vdev_close(vd->vdev_child[c]);
	}

	static void
	vdev_mirror_child_done(zio_t *zio)
	{
	mirror_child_t *mc = zio->io_private;

	mc->mc_error = zio->io_error;
	mc->mc_tried = 1;
	mc->mc_skipped = 0;
	}

	static void
	vdev_mirror_scrub_done(zio_t *zio)
	{
	mirror_child_t *mc = zio->io_private;

	if (zio->io_error == 0) {
	zio_t *pio;
	zio_link_t *zl = NULL;

	mutex_enter(&zio->io_lock);
	while ((pio = zio_walk_parents(zio, &zl)) != NULL) {
	mutex_enter(&pio->io_lock);
	ASSERT3U(zio->io_size, >=, pio->io_size);
	abd_copy(pio->io_abd, zio->io_abd, pio->io_size);
	mutex_exit(&pio->io_lock);
	}
	mutex_exit(&zio->io_lock);
	}

	abd_free(zio->io_abd);

	mc->mc_error = zio->io_error;
	mc->mc_tried = 1;
	mc->mc_skipped = 0;
	}

	/*
	* Check the other, lower-index DVAs to see if they're on the same
	* vdev as the child we picked. If they are, use them since they
	* are likely to have been allocated from the primary metaslab in
	* use at the time, and hence are more likely to have locality with
	* single-copy data.
	*/
	static int
	vdev_mirror_dva_select(zio_t *zio, int p)
	{
	dva_t *dva = zio->io_bp->blk_dva;
	mirror_map_t *mm = zio->io_vsd;
	int preferred;
	int c;

	preferred = mm->mm_preferred[p];
	for (p--; p >= 0; p--) {
	c = mm->mm_preferred[p];
	if (DVA_GET_VDEV(&dva[c]) == DVA_GET_VDEV(&dva[preferred]))
	preferred = c;
	}
	return (preferred);
	}

	static int
	vdev_mirror_preferred_child_randomize(zio_t *zio)
	{
	mirror_map_t *mm = zio->io_vsd;
	int p;

	if (mm->mm_root) {
	- p = spa_get_random(mm->mm_preferred_cnt);
	+ p = random_in_range(mm->mm_preferred_cnt);
	return (vdev_mirror_dva_select(zio, p));
	}

	/*
	* To ensure we don't always favour the first matching vdev,
	* which could lead to wear leveling issues on SSD's, we
	* use the I/O offset as a pseudo random seed into the vdevs
	* which have the lowest load.
	*/
	p = (zio->io_offset >> vdev_mirror_shift) % mm->mm_preferred_cnt;
	return (mm->mm_preferred[p]);
	}

	static boolean_t
	vdev_mirror_child_readable(mirror_child_t *mc)
	{
	vdev_t *vd = mc->mc_vd;

	if (vd->vdev_top != NULL && vd->vdev_top->vdev_ops == &vdev_draid_ops)
	return (vdev_draid_readable(vd, mc->mc_offset));
	else
	return (vdev_readable(vd));
	}

	static boolean_t
	vdev_mirror_child_missing(mirror_child_t *mc, uint64_t txg, uint64_t size)
	{
	vdev_t *vd = mc->mc_vd;

	if (vd->vdev_top != NULL && vd->vdev_top->vdev_ops == &vdev_draid_ops)
	return (vdev_draid_missing(vd, mc->mc_offset, txg, size));
	else
	return (vdev_dtl_contains(vd, DTL_MISSING, txg, size));
	}

	/*
	* Try to find a vdev whose DTL doesn't contain the block we want to read
	* preferring vdevs based on determined load. If we can't, try the read on
	* any vdev we haven't already tried.
	*
	* Distributed spares are an exception to the above load rule. They are
	* always preferred in order to detect gaps in the distributed spare which
	* are created when another disk in the dRAID fails. In order to restore
	* redundancy those gaps must be read to trigger the required repair IO.
	*/
	static int
	vdev_mirror_child_select(zio_t *zio)
	{
	mirror_map_t *mm = zio->io_vsd;
	uint64_t txg = zio->io_txg;
	int c, lowest_load;

	ASSERT(zio->io_bp == NULL \|\| BP_PHYSICAL_BIRTH(zio->io_bp) == txg);

	lowest_load = INT_MAX;
	mm->mm_preferred_cnt = 0;
	for (c = 0; c < mm->mm_children; c++) {
	mirror_child_t *mc;

	mc = &mm->mm_child[c];
	if (mc->mc_tried \|\| mc->mc_skipped)
	continue;

	if (mc->mc_vd == NULL \|\|
	!vdev_mirror_child_readable(mc)) {
	mc->mc_error = SET_ERROR(ENXIO);
	mc->mc_tried = 1; /* don't even try */
	mc->mc_skipped = 1;
	continue;
	}

	if (vdev_mirror_child_missing(mc, txg, 1)) {
	mc->mc_error = SET_ERROR(ESTALE);
	mc->mc_skipped = 1;
	mc->mc_speculative = 1;
	continue;
	}

	if (mc->mc_vd->vdev_ops == &vdev_draid_spare_ops) {
	mm->mm_preferred[0] = c;
	mm->mm_preferred_cnt = 1;
	break;
	}

	mc->mc_load = vdev_mirror_load(mm, mc->mc_vd, mc->mc_offset);
	if (mc->mc_load > lowest_load)
	continue;

	if (mc->mc_load < lowest_load) {
	lowest_load = mc->mc_load;
	mm->mm_preferred_cnt = 0;
	}
	mm->mm_preferred[mm->mm_preferred_cnt] = c;
	mm->mm_preferred_cnt++;
	}

	if (mm->mm_preferred_cnt == 1) {
	MIRROR_BUMP(vdev_mirror_stat_preferred_found);
	return (mm->mm_preferred[0]);
	}

	if (mm->mm_preferred_cnt > 1) {
	MIRROR_BUMP(vdev_mirror_stat_preferred_not_found);
	return (vdev_mirror_preferred_child_randomize(zio));
	}

	/*
	* Every device is either missing or has this txg in its DTL.
	* Look for any child we haven't already tried before giving up.
	*/
	for (c = 0; c < mm->mm_children; c++) {
	if (!mm->mm_child[c].mc_tried)
	return (c);
	}

	/*
	* Every child failed. There's no place left to look.
	*/
	return (-1);
	}

	static void
	vdev_mirror_io_start(zio_t *zio)
	{
	mirror_map_t *mm;
	mirror_child_t *mc;
	int c, children;

	mm = vdev_mirror_map_init(zio);
	zio->io_vsd = mm;
	zio->io_vsd_ops = &vdev_mirror_vsd_ops;

	if (mm == NULL) {
	ASSERT(!spa_trust_config(zio->io_spa));
	ASSERT(zio->io_type == ZIO_TYPE_READ);
	zio_execute(zio);
	return;
	}

	if (zio->io_type == ZIO_TYPE_READ) {
	if (zio->io_bp != NULL &&
	(zio->io_flags & ZIO_FLAG_SCRUB) && !mm->mm_resilvering) {
	/*
	* For scrubbing reads (if we can verify the
	* checksum here, as indicated by io_bp being
	* non-NULL) we need to allocate a read buffer for
	* each child and issue reads to all children. If
	* any child succeeds, it will copy its data into
	* zio->io_data in vdev_mirror_scrub_done.
	*/
	for (c = 0; c < mm->mm_children; c++) {
	mc = &mm->mm_child[c];

	/* Don't issue ZIOs to offline children */
	if (!vdev_mirror_child_readable(mc)) {
	mc->mc_error = SET_ERROR(ENXIO);
	mc->mc_tried = 1;
	mc->mc_skipped = 1;
	continue;
	}

	zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
	mc->mc_vd, mc->mc_offset,
	abd_alloc_sametype(zio->io_abd,
	zio->io_size), zio->io_size,
	zio->io_type, zio->io_priority, 0,
	vdev_mirror_scrub_done, mc));
	}
	zio_execute(zio);
	return;
	}
	/*
	* For normal reads just pick one child.
	*/
	c = vdev_mirror_child_select(zio);
	children = (c >= 0);
	} else {
	ASSERT(zio->io_type == ZIO_TYPE_WRITE);

	/*
	* Writes go to all children.
	*/
	c = 0;
	children = mm->mm_children;
	}

	while (children--) {
	mc = &mm->mm_child[c];
	c++;

	/*
	* When sequentially resilvering only issue write repair
	* IOs to the vdev which is being rebuilt since performance
	* is limited by the slowest child. This is an issue for
	* faster replacement devices such as distributed spares.
	*/
	if ((zio->io_priority == ZIO_PRIORITY_REBUILD) &&
	(zio->io_flags & ZIO_FLAG_IO_REPAIR) &&
	!(zio->io_flags & ZIO_FLAG_SCRUB) &&
	mm->mm_rebuilding && !mc->mc_rebuilding) {
	continue;
	}

	zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
	mc->mc_vd, mc->mc_offset, zio->io_abd, zio->io_size,
	zio->io_type, zio->io_priority, 0,
	vdev_mirror_child_done, mc));
	}

	zio_execute(zio);
	}

	static int
	vdev_mirror_worst_error(mirror_map_t *mm)
	{
	int error[2] = { 0, 0 };

	for (int c = 0; c < mm->mm_children; c++) {
	mirror_child_t *mc = &mm->mm_child[c];
	int s = mc->mc_speculative;
	error[s] = zio_worst_error(error[s], mc->mc_error);
	}

	return (error[0] ? error[0] : error[1]);
	}

	static void
	vdev_mirror_io_done(zio_t *zio)
	{
	mirror_map_t *mm = zio->io_vsd;
	mirror_child_t *mc;
	int c;
	int good_copies = 0;
	int unexpected_errors = 0;

	if (mm == NULL)
	return;

	for (c = 0; c < mm->mm_children; c++) {
	mc = &mm->mm_child[c];

	if (mc->mc_error) {
	if (!mc->mc_skipped)
	unexpected_errors++;
	} else if (mc->mc_tried) {
	good_copies++;
	}
	}

	if (zio->io_type == ZIO_TYPE_WRITE) {
	/*
	* XXX -- for now, treat partial writes as success.
	*
	* Now that we support write reallocation, it would be better
	* to treat partial failure as real failure unless there are
	* no non-degraded top-level vdevs left, and not update DTLs
	* if we intend to reallocate.
	*/
	/* XXPOLICY */
	if (good_copies != mm->mm_children) {
	/*
	* Always require at least one good copy.
	*
	* For ditto blocks (io_vd == NULL), require
	* all copies to be good.
	*
	* XXX -- for replacing vdevs, there's no great answer.
	* If the old device is really dead, we may not even
	* be able to access it -- so we only want to
	* require good writes to the new device. But if
	* the new device turns out to be flaky, we want
	* to be able to detach it -- which requires all
	* writes to the old device to have succeeded.
	*/
	if (good_copies == 0 \|\| zio->io_vd == NULL)
	zio->io_error = vdev_mirror_worst_error(mm);
	}
	return;
	}

	ASSERT(zio->io_type == ZIO_TYPE_READ);

	/*
	* If we don't have a good copy yet, keep trying other children.
	*/
	/* XXPOLICY */
	if (good_copies == 0 && (c = vdev_mirror_child_select(zio)) != -1) {
	ASSERT(c >= 0 && c < mm->mm_children);
	mc = &mm->mm_child[c];
	zio_vdev_io_redone(zio);
	zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
	mc->mc_vd, mc->mc_offset, zio->io_abd, zio->io_size,
	ZIO_TYPE_READ, zio->io_priority, 0,
	vdev_mirror_child_done, mc));
	return;
	}

	/* XXPOLICY */
	if (good_copies == 0) {
	zio->io_error = vdev_mirror_worst_error(mm);
	ASSERT(zio->io_error != 0);
	}

	if (good_copies && spa_writeable(zio->io_spa) &&
	(unexpected_errors \|\|
	(zio->io_flags & ZIO_FLAG_RESILVER) \|\|
	((zio->io_flags & ZIO_FLAG_SCRUB) && mm->mm_resilvering))) {
	/*
	* Use the good data we have in hand to repair damaged children.
	*/
	for (c = 0; c < mm->mm_children; c++) {
	/*
	* Don't rewrite known good children.
	* Not only is it unnecessary, it could
	* actually be harmful: if the system lost
	* power while rewriting the only good copy,
	* there would be no good copies left!
	*/
	mc = &mm->mm_child[c];

	if (mc->mc_error == 0) {
	vdev_ops_t *ops = mc->mc_vd->vdev_ops;

	if (mc->mc_tried)
	continue;
	/*
	* We didn't try this child. We need to
	* repair it if:
	* 1. it's a scrub (in which case we have
	* tried everything that was healthy)
	* - or -
	* 2. it's an indirect or distributed spare
	* vdev (in which case it could point to any
	* other vdev, which might have a bad DTL)
	* - or -
	* 3. the DTL indicates that this data is
	* missing from this vdev
	*/
	if (!(zio->io_flags & ZIO_FLAG_SCRUB) &&
	ops != &vdev_indirect_ops &&
	ops != &vdev_draid_spare_ops &&
	!vdev_dtl_contains(mc->mc_vd, DTL_PARTIAL,
	zio->io_txg, 1))
	continue;
	mc->mc_error = SET_ERROR(ESTALE);
	}

	zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
	mc->mc_vd, mc->mc_offset,
	zio->io_abd, zio->io_size, ZIO_TYPE_WRITE,
	zio->io_priority == ZIO_PRIORITY_REBUILD ?
	ZIO_PRIORITY_REBUILD : ZIO_PRIORITY_ASYNC_WRITE,
	ZIO_FLAG_IO_REPAIR \| (unexpected_errors ?
	ZIO_FLAG_SELF_HEAL : 0), NULL, NULL));
	}
	}
	}

	static void
	vdev_mirror_state_change(vdev_t *vd, int faulted, int degraded)
	{
	if (faulted == vd->vdev_children) {
	if (vdev_children_are_offline(vd)) {
	vdev_set_state(vd, B_FALSE, VDEV_STATE_OFFLINE,
	VDEV_AUX_CHILDREN_OFFLINE);
	} else {
	vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
	VDEV_AUX_NO_REPLICAS);
	}
	} else if (degraded + faulted != 0) {
	vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
	} else {
	vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);
	}
	}

	/*
	* Return the maximum asize for a rebuild zio in the provided range.
	*/
	static uint64_t
	vdev_mirror_rebuild_asize(vdev_t *vd, uint64_t start, uint64_t asize,
	uint64_t max_segment)
	{
	uint64_t psize = MIN(P2ROUNDUP(max_segment, 1 << vd->vdev_ashift),
	SPA_MAXBLOCKSIZE);

	return (MIN(asize, vdev_psize_to_asize(vd, psize)));
	}

	vdev_ops_t vdev_mirror_ops = {
	.vdev_op_init = NULL,
	.vdev_op_fini = NULL,
	.vdev_op_open = vdev_mirror_open,
	.vdev_op_close = vdev_mirror_close,
	.vdev_op_asize = vdev_default_asize,
	.vdev_op_min_asize = vdev_default_min_asize,
	.vdev_op_min_alloc = NULL,
	.vdev_op_io_start = vdev_mirror_io_start,
	.vdev_op_io_done = vdev_mirror_io_done,
	.vdev_op_state_change = vdev_mirror_state_change,
	.vdev_op_need_resilver = vdev_default_need_resilver,
	.vdev_op_hold = NULL,
	.vdev_op_rele = NULL,
	.vdev_op_remap = NULL,
	.vdev_op_xlate = vdev_default_xlate,
	.vdev_op_rebuild_asize = vdev_mirror_rebuild_asize,
	.vdev_op_metaslab_init = NULL,
	.vdev_op_config_generate = NULL,
	.vdev_op_nparity = NULL,
	.vdev_op_ndisks = NULL,
	.vdev_op_type = VDEV_TYPE_MIRROR, /* name of this vdev type */
	.vdev_op_leaf = B_FALSE /* not a leaf vdev */
	};

	vdev_ops_t vdev_replacing_ops = {
	.vdev_op_init = NULL,
	.vdev_op_fini = NULL,
	.vdev_op_open = vdev_mirror_open,
	.vdev_op_close = vdev_mirror_close,
	.vdev_op_asize = vdev_default_asize,
	.vdev_op_min_asize = vdev_default_min_asize,
	.vdev_op_min_alloc = NULL,
	.vdev_op_io_start = vdev_mirror_io_start,
	.vdev_op_io_done = vdev_mirror_io_done,
	.vdev_op_state_change = vdev_mirror_state_change,
	.vdev_op_need_resilver = vdev_default_need_resilver,
	.vdev_op_hold = NULL,
	.vdev_op_rele = NULL,
	.vdev_op_remap = NULL,
	.vdev_op_xlate = vdev_default_xlate,
	.vdev_op_rebuild_asize = vdev_mirror_rebuild_asize,
	.vdev_op_metaslab_init = NULL,
	.vdev_op_config_generate = NULL,
	.vdev_op_nparity = NULL,
	.vdev_op_ndisks = NULL,
	.vdev_op_type = VDEV_TYPE_REPLACING, /* name of this vdev type */
	.vdev_op_leaf = B_FALSE /* not a leaf vdev */
	};

	vdev_ops_t vdev_spare_ops = {
	.vdev_op_init = NULL,
	.vdev_op_fini = NULL,
	.vdev_op_open = vdev_mirror_open,
	.vdev_op_close = vdev_mirror_close,
	.vdev_op_asize = vdev_default_asize,
	.vdev_op_min_asize = vdev_default_min_asize,
	.vdev_op_min_alloc = NULL,
	.vdev_op_io_start = vdev_mirror_io_start,
	.vdev_op_io_done = vdev_mirror_io_done,
	.vdev_op_state_change = vdev_mirror_state_change,
	.vdev_op_need_resilver = vdev_default_need_resilver,
	.vdev_op_hold = NULL,
	.vdev_op_rele = NULL,
	.vdev_op_remap = NULL,
	.vdev_op_xlate = vdev_default_xlate,
	.vdev_op_rebuild_asize = vdev_mirror_rebuild_asize,
	.vdev_op_metaslab_init = NULL,
	.vdev_op_config_generate = NULL,
	.vdev_op_nparity = NULL,
	.vdev_op_ndisks = NULL,
	.vdev_op_type = VDEV_TYPE_SPARE, /* name of this vdev type */
	.vdev_op_leaf = B_FALSE /* not a leaf vdev */
	};

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_inc, INT, ZMOD_RW,
	"Rotating media load increment for non-seeking I/O's");

	ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_seek_inc, INT, ZMOD_RW,
	"Rotating media load increment for seeking I/O's");

	ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_seek_offset, INT, ZMOD_RW,
	"Offset in bytes from the last I/O which triggers "
	"a reduced rotating media seek increment");

	ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, non_rotating_inc, INT, ZMOD_RW,
	"Non-rotating media load increment for non-seeking I/O's");

	ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, non_rotating_seek_inc, INT, ZMOD_RW,
	"Non-rotating media load increment for seeking I/O's");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/vdev_queue.c b/sys/contrib/openzfs/module/zfs/vdev_queue.c
	index 198861edb816..cc5b15b8c028 100644
	--- a/sys/contrib/openzfs/module/zfs/vdev_queue.c
	+++ b/sys/contrib/openzfs/module/zfs/vdev_queue.c
	@@ -1,1117 +1,1121 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	/*
	* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/vdev_impl.h>
	#include <sys/spa_impl.h>
	#include <sys/zio.h>
	#include <sys/avl.h>
	#include <sys/dsl_pool.h>
	#include <sys/metaslab_impl.h>
	#include <sys/spa.h>
	#include <sys/abd.h>

	/*
	* ZFS I/O Scheduler
	* ---------------
	*
	* ZFS issues I/O operations to leaf vdevs to satisfy and complete zios. The
	* I/O scheduler determines when and in what order those operations are
	* issued. The I/O scheduler divides operations into five I/O classes
	* prioritized in the following order: sync read, sync write, async read,
	* async write, and scrub/resilver. Each queue defines the minimum and
	* maximum number of concurrent operations that may be issued to the device.
	* In addition, the device has an aggregate maximum. Note that the sum of the
	* per-queue minimums must not exceed the aggregate maximum. If the
	* sum of the per-queue maximums exceeds the aggregate maximum, then the
	* number of active i/os may reach zfs_vdev_max_active, in which case no
	* further i/os will be issued regardless of whether all per-queue
	* minimums have been met.
	*
	* For many physical devices, throughput increases with the number of
	* concurrent operations, but latency typically suffers. Further, physical
	* devices typically have a limit at which more concurrent operations have no
	* effect on throughput or can actually cause it to decrease.
	*
	* The scheduler selects the next operation to issue by first looking for an
	* I/O class whose minimum has not been satisfied. Once all are satisfied and
	* the aggregate maximum has not been hit, the scheduler looks for classes
	* whose maximum has not been satisfied. Iteration through the I/O classes is
	* done in the order specified above. No further operations are issued if the
	* aggregate maximum number of concurrent operations has been hit or if there
	* are no operations queued for an I/O class that has not hit its maximum.
	* Every time an i/o is queued or an operation completes, the I/O scheduler
	* looks for new operations to issue.
	*
	* All I/O classes have a fixed maximum number of outstanding operations
	* except for the async write class. Asynchronous writes represent the data
	* that is committed to stable storage during the syncing stage for
	* transaction groups (see txg.c). Transaction groups enter the syncing state
	* periodically so the number of queued async writes will quickly burst up and
	* then bleed down to zero. Rather than servicing them as quickly as possible,
	* the I/O scheduler changes the maximum number of active async write i/os
	* according to the amount of dirty data in the pool (see dsl_pool.c). Since
	* both throughput and latency typically increase with the number of
	* concurrent operations issued to physical devices, reducing the burstiness
	* in the number of concurrent operations also stabilizes the response time of
	* operations from other -- and in particular synchronous -- queues. In broad
	* strokes, the I/O scheduler will issue more concurrent operations from the
	* async write queue as there's more dirty data in the pool.
	*
	* Async Writes
	*
	* The number of concurrent operations issued for the async write I/O class
	* follows a piece-wise linear function defined by a few adjustable points.
	*
	* \| o---------\| <-- zfs_vdev_async_write_max_active
	* ^ \| /^ \|
	* \| \| / \| \|
	* active \| / \| \|
	* I/O \| / \| \|
	* count \| / \| \|
	* \| / \| \|
	* \|------------o \| \| <-- zfs_vdev_async_write_min_active
	* 0\|____________^______\|_________\|
	* 0% \| \| 100% of zfs_dirty_data_max
	* \| \|
	* \| `-- zfs_vdev_async_write_active_max_dirty_percent
	* `--------- zfs_vdev_async_write_active_min_dirty_percent
	*
	* Until the amount of dirty data exceeds a minimum percentage of the dirty
	* data allowed in the pool, the I/O scheduler will limit the number of
	* concurrent operations to the minimum. As that threshold is crossed, the
	* number of concurrent operations issued increases linearly to the maximum at
	* the specified maximum percentage of the dirty data allowed in the pool.
	*
	* Ideally, the amount of dirty data on a busy pool will stay in the sloped
	* part of the function between zfs_vdev_async_write_active_min_dirty_percent
	* and zfs_vdev_async_write_active_max_dirty_percent. If it exceeds the
	* maximum percentage, this indicates that the rate of incoming data is
	* greater than the rate that the backend storage can handle. In this case, we
	* must further throttle incoming writes (see dmu_tx_delay() for details).
	*/

	/*
	* The maximum number of i/os active to each device. Ideally, this will be >=
	* the sum of each queue's max_active.
	*/
	uint32_t zfs_vdev_max_active = 1000;

	/*
	* Per-queue limits on the number of i/os active to each device. If the
	* number of active i/os is < zfs_vdev_max_active, then the min_active comes
	* into play. We will send min_active from each queue round-robin, and then
	* send from queues in the order defined by zio_priority_t up to max_active.
	* Some queues have additional mechanisms to limit number of active I/Os in
	* addition to min_active and max_active, see below.
	*
	* In general, smaller max_active's will lead to lower latency of synchronous
	* operations. Larger max_active's may lead to higher overall throughput,
	* depending on underlying storage.
	*
	* The ratio of the queues' max_actives determines the balance of performance
	* between reads, writes, and scrubs. E.g., increasing
	* zfs_vdev_scrub_max_active will cause the scrub or resilver to complete
	* more quickly, but reads and writes to have higher latency and lower
	* throughput.
	*/
	uint32_t zfs_vdev_sync_read_min_active = 10;
	uint32_t zfs_vdev_sync_read_max_active = 10;
	uint32_t zfs_vdev_sync_write_min_active = 10;
	uint32_t zfs_vdev_sync_write_max_active = 10;
	uint32_t zfs_vdev_async_read_min_active = 1;
	uint32_t zfs_vdev_async_read_max_active = 3;
	uint32_t zfs_vdev_async_write_min_active = 2;
	uint32_t zfs_vdev_async_write_max_active = 10;
	uint32_t zfs_vdev_scrub_min_active = 1;
	uint32_t zfs_vdev_scrub_max_active = 3;
	uint32_t zfs_vdev_removal_min_active = 1;
	uint32_t zfs_vdev_removal_max_active = 2;
	uint32_t zfs_vdev_initializing_min_active = 1;
	uint32_t zfs_vdev_initializing_max_active = 1;
	uint32_t zfs_vdev_trim_min_active = 1;
	uint32_t zfs_vdev_trim_max_active = 2;
	uint32_t zfs_vdev_rebuild_min_active = 1;
	uint32_t zfs_vdev_rebuild_max_active = 3;

	/*
	* When the pool has less than zfs_vdev_async_write_active_min_dirty_percent
	* dirty data, use zfs_vdev_async_write_min_active. When it has more than
	* zfs_vdev_async_write_active_max_dirty_percent, use
	* zfs_vdev_async_write_max_active. The value is linearly interpolated
	* between min and max.
	*/
	int zfs_vdev_async_write_active_min_dirty_percent = 30;
	int zfs_vdev_async_write_active_max_dirty_percent = 60;

	/*
	* For non-interactive I/O (scrub, resilver, removal, initialize and rebuild),
	* the number of concurrently-active I/O's is limited to *_min_active, unless
	* the vdev is "idle". When there are no interactive I/Os active (sync or
	* async), and zfs_vdev_nia_delay I/Os have completed since the last
	* interactive I/O, then the vdev is considered to be "idle", and the number
	* of concurrently-active non-interactive I/O's is increased to *_max_active.
	*/
	uint_t zfs_vdev_nia_delay = 5;

	/*
	* Some HDDs tend to prioritize sequential I/O so high that concurrent
	* random I/O latency reaches several seconds. On some HDDs it happens
	* even if sequential I/Os are submitted one at a time, and so setting
	* *_max_active to 1 does not help. To prevent non-interactive I/Os, like
	* scrub, from monopolizing the device no more than zfs_vdev_nia_credit
	* I/Os can be sent while there are outstanding incomplete interactive
	* I/Os. This enforced wait ensures the HDD services the interactive I/O
	* within a reasonable amount of time.
	*/
	uint_t zfs_vdev_nia_credit = 5;

	/*
	* To reduce IOPs, we aggregate small adjacent I/Os into one large I/O.
	* For read I/Os, we also aggregate across small adjacency gaps; for writes
	* we include spans of optional I/Os to aid aggregation at the disk even when
	* they aren't able to help us aggregate at this level.
	*/
	int zfs_vdev_aggregation_limit = 1 << 20;
	int zfs_vdev_aggregation_limit_non_rotating = SPA_OLD_MAXBLOCKSIZE;
	int zfs_vdev_read_gap_limit = 32 << 10;
	int zfs_vdev_write_gap_limit = 4 << 10;

	/*
	* Define the queue depth percentage for each top-level. This percentage is
	* used in conjunction with zfs_vdev_async_max_active to determine how many
	* allocations a specific top-level vdev should handle. Once the queue depth
	* reaches zfs_vdev_queue_depth_pct * zfs_vdev_async_write_max_active / 100
	* then allocator will stop allocating blocks on that top-level device.
	* The default kernel setting is 1000% which will yield 100 allocations per
	* device. For userland testing, the default setting is 300% which equates
	* to 30 allocations per device.
	*/
	#ifdef _KERNEL
	int zfs_vdev_queue_depth_pct = 1000;
	#else
	int zfs_vdev_queue_depth_pct = 300;
	#endif

	/*
	* When performing allocations for a given metaslab, we want to make sure that
	* there are enough IOs to aggregate together to improve throughput. We want to
	* ensure that there are at least 128k worth of IOs that can be aggregated, and
	* we assume that the average allocation size is 4k, so we need the queue depth
	* to be 32 per allocator to get good aggregation of sequential writes.
	*/
	int zfs_vdev_def_queue_depth = 32;

	/*
	* Allow TRIM I/Os to be aggregated. This should normally not be needed since
	* TRIM I/O for extents up to zfs_trim_extent_bytes_max (128M) can be submitted
	* by the TRIM code in zfs_trim.c.
	*/
	int zfs_vdev_aggregate_trim = 0;

	static int
	vdev_queue_offset_compare(const void x1, const void x2)
	{
	const zio_t z1 = (const zio_t )x1;
	const zio_t z2 = (const zio_t )x2;

	int cmp = TREE_CMP(z1->io_offset, z2->io_offset);

	if (likely(cmp))
	return (cmp);

	return (TREE_PCMP(z1, z2));
	}

	static inline avl_tree_t *
	vdev_queue_class_tree(vdev_queue_t *vq, zio_priority_t p)
	{
	return (&vq->vq_class[p].vqc_queued_tree);
	}

	static inline avl_tree_t *
	vdev_queue_type_tree(vdev_queue_t *vq, zio_type_t t)
	{
	ASSERT(t == ZIO_TYPE_READ \|\| t == ZIO_TYPE_WRITE \|\| t == ZIO_TYPE_TRIM);
	if (t == ZIO_TYPE_READ)
	return (&vq->vq_read_offset_tree);
	else if (t == ZIO_TYPE_WRITE)
	return (&vq->vq_write_offset_tree);
	else
	return (&vq->vq_trim_offset_tree);
	}

	static int
	vdev_queue_timestamp_compare(const void x1, const void x2)
	{
	const zio_t z1 = (const zio_t )x1;
	const zio_t z2 = (const zio_t )x2;

	int cmp = TREE_CMP(z1->io_timestamp, z2->io_timestamp);

	if (likely(cmp))
	return (cmp);

	return (TREE_PCMP(z1, z2));
	}

	static int
	vdev_queue_class_min_active(vdev_queue_t *vq, zio_priority_t p)
	{
	switch (p) {
	case ZIO_PRIORITY_SYNC_READ:
	return (zfs_vdev_sync_read_min_active);
	case ZIO_PRIORITY_SYNC_WRITE:
	return (zfs_vdev_sync_write_min_active);
	case ZIO_PRIORITY_ASYNC_READ:
	return (zfs_vdev_async_read_min_active);
	case ZIO_PRIORITY_ASYNC_WRITE:
	return (zfs_vdev_async_write_min_active);
	case ZIO_PRIORITY_SCRUB:
	return (vq->vq_ia_active == 0 ? zfs_vdev_scrub_min_active :
	MIN(vq->vq_nia_credit, zfs_vdev_scrub_min_active));
	case ZIO_PRIORITY_REMOVAL:
	return (vq->vq_ia_active == 0 ? zfs_vdev_removal_min_active :
	MIN(vq->vq_nia_credit, zfs_vdev_removal_min_active));
	case ZIO_PRIORITY_INITIALIZING:
	return (vq->vq_ia_active == 0 ?zfs_vdev_initializing_min_active:
	MIN(vq->vq_nia_credit, zfs_vdev_initializing_min_active));
	case ZIO_PRIORITY_TRIM:
	return (zfs_vdev_trim_min_active);
	case ZIO_PRIORITY_REBUILD:
	return (vq->vq_ia_active == 0 ? zfs_vdev_rebuild_min_active :
	MIN(vq->vq_nia_credit, zfs_vdev_rebuild_min_active));
	default:
	panic("invalid priority %u", p);
	return (0);
	}
	}

	static int
	vdev_queue_max_async_writes(spa_t *spa)
	{
	int writes;
	uint64_t dirty = 0;
	dsl_pool_t *dp = spa_get_dsl(spa);
	uint64_t min_bytes = zfs_dirty_data_max *
	zfs_vdev_async_write_active_min_dirty_percent / 100;
	uint64_t max_bytes = zfs_dirty_data_max *
	zfs_vdev_async_write_active_max_dirty_percent / 100;

	/*
	* Async writes may occur before the assignment of the spa's
	* dsl_pool_t if a self-healing zio is issued prior to the
	* completion of dmu_objset_open_impl().
	*/
	if (dp == NULL)
	return (zfs_vdev_async_write_max_active);

	/*
	* Sync tasks correspond to interactive user actions. To reduce the
	* execution time of those actions we push data out as fast as possible.
	*/
	dirty = dp->dp_dirty_total;
	if (dirty > max_bytes \|\| spa_has_pending_synctask(spa))
	return (zfs_vdev_async_write_max_active);

	if (dirty < min_bytes)
	return (zfs_vdev_async_write_min_active);

	/*
	* linear interpolation:
	* slope = (max_writes - min_writes) / (max_bytes - min_bytes)
	* move right by min_bytes
	* move up by min_writes
	*/
	writes = (dirty - min_bytes) *
	(zfs_vdev_async_write_max_active -
	zfs_vdev_async_write_min_active) /
	(max_bytes - min_bytes) +
	zfs_vdev_async_write_min_active;
	ASSERT3U(writes, >=, zfs_vdev_async_write_min_active);
	ASSERT3U(writes, <=, zfs_vdev_async_write_max_active);
	return (writes);
	}

	static int
	vdev_queue_class_max_active(spa_t spa, vdev_queue_t vq, zio_priority_t p)
	{
	switch (p) {
	case ZIO_PRIORITY_SYNC_READ:
	return (zfs_vdev_sync_read_max_active);
	case ZIO_PRIORITY_SYNC_WRITE:
	return (zfs_vdev_sync_write_max_active);
	case ZIO_PRIORITY_ASYNC_READ:
	return (zfs_vdev_async_read_max_active);
	case ZIO_PRIORITY_ASYNC_WRITE:
	return (vdev_queue_max_async_writes(spa));
	case ZIO_PRIORITY_SCRUB:
	if (vq->vq_ia_active > 0) {
	return (MIN(vq->vq_nia_credit,
	zfs_vdev_scrub_min_active));
	} else if (vq->vq_nia_credit < zfs_vdev_nia_delay)
	return (MAX(1, zfs_vdev_scrub_min_active));
	return (zfs_vdev_scrub_max_active);
	case ZIO_PRIORITY_REMOVAL:
	if (vq->vq_ia_active > 0) {
	return (MIN(vq->vq_nia_credit,
	zfs_vdev_removal_min_active));
	} else if (vq->vq_nia_credit < zfs_vdev_nia_delay)
	return (MAX(1, zfs_vdev_removal_min_active));
	return (zfs_vdev_removal_max_active);
	case ZIO_PRIORITY_INITIALIZING:
	if (vq->vq_ia_active > 0) {
	return (MIN(vq->vq_nia_credit,
	zfs_vdev_initializing_min_active));
	} else if (vq->vq_nia_credit < zfs_vdev_nia_delay)
	return (MAX(1, zfs_vdev_initializing_min_active));
	return (zfs_vdev_initializing_max_active);
	case ZIO_PRIORITY_TRIM:
	return (zfs_vdev_trim_max_active);
	case ZIO_PRIORITY_REBUILD:
	if (vq->vq_ia_active > 0) {
	return (MIN(vq->vq_nia_credit,
	zfs_vdev_rebuild_min_active));
	} else if (vq->vq_nia_credit < zfs_vdev_nia_delay)
	return (MAX(1, zfs_vdev_rebuild_min_active));
	return (zfs_vdev_rebuild_max_active);
	default:
	panic("invalid priority %u", p);
	return (0);
	}
	}

	/*
	* Return the i/o class to issue from, or ZIO_PRIORITY_MAX_QUEUEABLE if
	* there is no eligible class.
	*/
	static zio_priority_t
	vdev_queue_class_to_issue(vdev_queue_t *vq)
	{
	spa_t *spa = vq->vq_vdev->vdev_spa;
	zio_priority_t p, n;

	if (avl_numnodes(&vq->vq_active_tree) >= zfs_vdev_max_active)
	return (ZIO_PRIORITY_NUM_QUEUEABLE);

	/*
	* Find a queue that has not reached its minimum # outstanding i/os.
	* Do round-robin to reduce starvation due to zfs_vdev_max_active
	* and vq_nia_credit limits.
	*/
	for (n = 0; n < ZIO_PRIORITY_NUM_QUEUEABLE; n++) {
	p = (vq->vq_last_prio + n + 1) % ZIO_PRIORITY_NUM_QUEUEABLE;
	if (avl_numnodes(vdev_queue_class_tree(vq, p)) > 0 &&
	vq->vq_class[p].vqc_active <
	vdev_queue_class_min_active(vq, p)) {
	vq->vq_last_prio = p;
	return (p);
	}
	}

	/*
	* If we haven't found a queue, look for one that hasn't reached its
	* maximum # outstanding i/os.
	*/
	for (p = 0; p < ZIO_PRIORITY_NUM_QUEUEABLE; p++) {
	if (avl_numnodes(vdev_queue_class_tree(vq, p)) > 0 &&
	vq->vq_class[p].vqc_active <
	vdev_queue_class_max_active(spa, vq, p)) {
	vq->vq_last_prio = p;
	return (p);
	}
	}

	/* No eligible queued i/os */
	return (ZIO_PRIORITY_NUM_QUEUEABLE);
	}

	void
	vdev_queue_init(vdev_t *vd)
	{
	vdev_queue_t *vq = &vd->vdev_queue;
	zio_priority_t p;

	mutex_init(&vq->vq_lock, NULL, MUTEX_DEFAULT, NULL);
	vq->vq_vdev = vd;
	taskq_init_ent(&vd->vdev_queue.vq_io_search.io_tqent);

	avl_create(&vq->vq_active_tree, vdev_queue_offset_compare,
	sizeof (zio_t), offsetof(struct zio, io_queue_node));
	avl_create(vdev_queue_type_tree(vq, ZIO_TYPE_READ),
	vdev_queue_offset_compare, sizeof (zio_t),
	offsetof(struct zio, io_offset_node));
	avl_create(vdev_queue_type_tree(vq, ZIO_TYPE_WRITE),
	vdev_queue_offset_compare, sizeof (zio_t),
	offsetof(struct zio, io_offset_node));
	avl_create(vdev_queue_type_tree(vq, ZIO_TYPE_TRIM),
	vdev_queue_offset_compare, sizeof (zio_t),
	offsetof(struct zio, io_offset_node));

	for (p = 0; p < ZIO_PRIORITY_NUM_QUEUEABLE; p++) {
	int (compfn) (const void , const void *);

	/*
	* The synchronous/trim i/o queues are dispatched in FIFO rather
	* than LBA order. This provides more consistent latency for
	* these i/os.
	*/
	if (p == ZIO_PRIORITY_SYNC_READ \|\|
	p == ZIO_PRIORITY_SYNC_WRITE \|\|
	p == ZIO_PRIORITY_TRIM) {
	compfn = vdev_queue_timestamp_compare;
	} else {
	compfn = vdev_queue_offset_compare;
	}
	avl_create(vdev_queue_class_tree(vq, p), compfn,
	sizeof (zio_t), offsetof(struct zio, io_queue_node));
	}

	vq->vq_last_offset = 0;
	}

	void
	vdev_queue_fini(vdev_t *vd)
	{
	vdev_queue_t *vq = &vd->vdev_queue;

	for (zio_priority_t p = 0; p < ZIO_PRIORITY_NUM_QUEUEABLE; p++)
	avl_destroy(vdev_queue_class_tree(vq, p));
	avl_destroy(&vq->vq_active_tree);
	avl_destroy(vdev_queue_type_tree(vq, ZIO_TYPE_READ));
	avl_destroy(vdev_queue_type_tree(vq, ZIO_TYPE_WRITE));
	avl_destroy(vdev_queue_type_tree(vq, ZIO_TYPE_TRIM));

	mutex_destroy(&vq->vq_lock);
	}

	static void
	vdev_queue_io_add(vdev_queue_t vq, zio_t zio)
	{
	ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
	avl_add(vdev_queue_class_tree(vq, zio->io_priority), zio);
	avl_add(vdev_queue_type_tree(vq, zio->io_type), zio);
	}

	static void
	vdev_queue_io_remove(vdev_queue_t vq, zio_t zio)
	{
	ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
	avl_remove(vdev_queue_class_tree(vq, zio->io_priority), zio);
	avl_remove(vdev_queue_type_tree(vq, zio->io_type), zio);
	}

	static boolean_t
	vdev_queue_is_interactive(zio_priority_t p)
	{
	switch (p) {
	case ZIO_PRIORITY_SCRUB:
	case ZIO_PRIORITY_REMOVAL:
	case ZIO_PRIORITY_INITIALIZING:
	case ZIO_PRIORITY_REBUILD:
	return (B_FALSE);
	default:
	return (B_TRUE);
	}
	}

	static void
	vdev_queue_pending_add(vdev_queue_t vq, zio_t zio)
	{
	ASSERT(MUTEX_HELD(&vq->vq_lock));
	ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
	vq->vq_class[zio->io_priority].vqc_active++;
	if (vdev_queue_is_interactive(zio->io_priority)) {
	if (++vq->vq_ia_active == 1)
	vq->vq_nia_credit = 1;
	} else if (vq->vq_ia_active > 0) {
	vq->vq_nia_credit--;
	}
	avl_add(&vq->vq_active_tree, zio);
	}

	static void
	vdev_queue_pending_remove(vdev_queue_t vq, zio_t zio)
	{
	ASSERT(MUTEX_HELD(&vq->vq_lock));
	ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
	vq->vq_class[zio->io_priority].vqc_active--;
	if (vdev_queue_is_interactive(zio->io_priority)) {
	if (--vq->vq_ia_active == 0)
	vq->vq_nia_credit = 0;
	else
	vq->vq_nia_credit = zfs_vdev_nia_credit;
	} else if (vq->vq_ia_active == 0)
	vq->vq_nia_credit++;
	avl_remove(&vq->vq_active_tree, zio);
	}

	static void
	vdev_queue_agg_io_done(zio_t *aio)
	{
	abd_free(aio->io_abd);
	}

	/*
	* Compute the range spanned by two i/os, which is the endpoint of the last
	* (lio->io_offset + lio->io_size) minus start of the first (fio->io_offset).
	* Conveniently, the gap between fio and lio is given by -IO_SPAN(lio, fio);
	* thus fio and lio are adjacent if and only if IO_SPAN(lio, fio) == 0.
	*/
	#define IO_SPAN(fio, lio) ((lio)->io_offset + (lio)->io_size - (fio)->io_offset)
	#define IO_GAP(fio, lio) (-IO_SPAN(lio, fio))

	/*
	* Sufficiently adjacent io_offset's in ZIOs will be aggregated. We do this
	* by creating a gang ABD from the adjacent ZIOs io_abd's. By using
	* a gang ABD we avoid doing memory copies to and from the parent,
	* child ZIOs. The gang ABD also accounts for gaps between adjacent
	* io_offsets by simply getting the zero ABD for writes or allocating
	* a new ABD for reads and placing them in the gang ABD as well.
	*/
	static zio_t *
	vdev_queue_aggregate(vdev_queue_t vq, zio_t zio)
	{
	zio_t first, last, aio, dio, mandatory, nio;
	- zio_link_t *zl = NULL;
	uint64_t maxgap = 0;
	uint64_t size;
	uint64_t limit;
	int maxblocksize;
	boolean_t stretch = B_FALSE;
	avl_tree_t *t = vdev_queue_type_tree(vq, zio->io_type);
	enum zio_flag flags = zio->io_flags & ZIO_FLAG_AGG_INHERIT;
	uint64_t next_offset;
	abd_t *abd;

	maxblocksize = spa_maxblocksize(vq->vq_vdev->vdev_spa);
	if (vq->vq_vdev->vdev_nonrot)
	limit = zfs_vdev_aggregation_limit_non_rotating;
	else
	limit = zfs_vdev_aggregation_limit;
	limit = MAX(MIN(limit, maxblocksize), 0);

	if (zio->io_flags & ZIO_FLAG_DONT_AGGREGATE \|\| limit == 0)
	return (NULL);

	/*
	* While TRIM commands could be aggregated based on offset this
	* behavior is disabled until it's determined to be beneficial.
	*/
	if (zio->io_type == ZIO_TYPE_TRIM && !zfs_vdev_aggregate_trim)
	return (NULL);

	/*
	* I/Os to distributed spares are directly dispatched to the dRAID
	* leaf vdevs for aggregation. See the comment at the end of the
	* zio_vdev_io_start() function.
	*/
	ASSERT(vq->vq_vdev->vdev_ops != &vdev_draid_spare_ops);

	first = last = zio;

	if (zio->io_type == ZIO_TYPE_READ)
	maxgap = zfs_vdev_read_gap_limit;

	/*
	* We can aggregate I/Os that are sufficiently adjacent and of
	* the same flavor, as expressed by the AGG_INHERIT flags.
	* The latter requirement is necessary so that certain
	* attributes of the I/O, such as whether it's a normal I/O
	* or a scrub/resilver, can be preserved in the aggregate.
	* We can include optional I/Os, but don't allow them
	* to begin a range as they add no benefit in that situation.
	*/

	/*
	* We keep track of the last non-optional I/O.
	*/
	mandatory = (first->io_flags & ZIO_FLAG_OPTIONAL) ? NULL : first;

	/*
	* Walk backwards through sufficiently contiguous I/Os
	* recording the last non-optional I/O.
	*/
	while ((dio = AVL_PREV(t, first)) != NULL &&
	(dio->io_flags & ZIO_FLAG_AGG_INHERIT) == flags &&
	IO_SPAN(dio, last) <= limit &&
	IO_GAP(dio, first) <= maxgap &&
	dio->io_type == zio->io_type) {
	first = dio;
	if (mandatory == NULL && !(first->io_flags & ZIO_FLAG_OPTIONAL))
	mandatory = first;
	}

	/*
	* Skip any initial optional I/Os.
	*/
	while ((first->io_flags & ZIO_FLAG_OPTIONAL) && first != last) {
	first = AVL_NEXT(t, first);
	ASSERT(first != NULL);
	}


	/*
	* Walk forward through sufficiently contiguous I/Os.
	* The aggregation limit does not apply to optional i/os, so that
	* we can issue contiguous writes even if they are larger than the
	* aggregation limit.
	*/
	while ((dio = AVL_NEXT(t, last)) != NULL &&
	(dio->io_flags & ZIO_FLAG_AGG_INHERIT) == flags &&
	(IO_SPAN(first, dio) <= limit \|\|
	(dio->io_flags & ZIO_FLAG_OPTIONAL)) &&
	IO_SPAN(first, dio) <= maxblocksize &&
	IO_GAP(last, dio) <= maxgap &&
	dio->io_type == zio->io_type) {
	last = dio;
	if (!(last->io_flags & ZIO_FLAG_OPTIONAL))
	mandatory = last;
	}

	/*
	* Now that we've established the range of the I/O aggregation
	* we must decide what to do with trailing optional I/Os.
	* For reads, there's nothing to do. While we are unable to
	* aggregate further, it's possible that a trailing optional
	* I/O would allow the underlying device to aggregate with
	* subsequent I/Os. We must therefore determine if the next
	* non-optional I/O is close enough to make aggregation
	* worthwhile.
	*/
	if (zio->io_type == ZIO_TYPE_WRITE && mandatory != NULL) {
	zio_t *nio = last;
	while ((dio = AVL_NEXT(t, nio)) != NULL &&
	IO_GAP(nio, dio) == 0 &&
	IO_GAP(mandatory, dio) <= zfs_vdev_write_gap_limit) {
	nio = dio;
	if (!(nio->io_flags & ZIO_FLAG_OPTIONAL)) {
	stretch = B_TRUE;
	break;
	}
	}
	}

	if (stretch) {
	/*
	* We are going to include an optional io in our aggregated
	* span, thus closing the write gap. Only mandatory i/os can
	* start aggregated spans, so make sure that the next i/o
	* after our span is mandatory.
	*/
	dio = AVL_NEXT(t, last);
	dio->io_flags &= ~ZIO_FLAG_OPTIONAL;
	} else {
	/* do not include the optional i/o */
	while (last != mandatory && last != first) {
	ASSERT(last->io_flags & ZIO_FLAG_OPTIONAL);
	last = AVL_PREV(t, last);
	ASSERT(last != NULL);
	}
	}

	if (first == last)
	return (NULL);

	size = IO_SPAN(first, last);
	ASSERT3U(size, <=, maxblocksize);

	abd = abd_alloc_gang();
	if (abd == NULL)
	return (NULL);

	aio = zio_vdev_delegated_io(first->io_vd, first->io_offset,
	abd, size, first->io_type, zio->io_priority,
	flags \| ZIO_FLAG_DONT_CACHE \| ZIO_FLAG_DONT_QUEUE,
	vdev_queue_agg_io_done, NULL);
	aio->io_timestamp = first->io_timestamp;

	nio = first;
	next_offset = first->io_offset;
	do {
	dio = nio;
	nio = AVL_NEXT(t, dio);
	zio_add_child(dio, aio);
	vdev_queue_io_remove(vq, dio);

	if (dio->io_offset != next_offset) {
	/* allocate a buffer for a read gap */
	ASSERT3U(dio->io_type, ==, ZIO_TYPE_READ);
	ASSERT3U(dio->io_offset, >, next_offset);
	abd = abd_alloc_for_io(
	dio->io_offset - next_offset, B_TRUE);
	abd_gang_add(aio->io_abd, abd, B_TRUE);
	}
	if (dio->io_abd &&
	(dio->io_size != abd_get_size(dio->io_abd))) {
	/* abd size not the same as IO size */
	ASSERT3U(abd_get_size(dio->io_abd), >, dio->io_size);
	abd = abd_get_offset_size(dio->io_abd, 0, dio->io_size);
	abd_gang_add(aio->io_abd, abd, B_TRUE);
	} else {
	if (dio->io_flags & ZIO_FLAG_NODATA) {
	/* allocate a buffer for a write gap */
	ASSERT3U(dio->io_type, ==, ZIO_TYPE_WRITE);
	ASSERT3P(dio->io_abd, ==, NULL);
	abd_gang_add(aio->io_abd,
	abd_get_zeros(dio->io_size), B_TRUE);
	} else {
	/*
	* We pass B_FALSE to abd_gang_add()
	* because we did not allocate a new
	* ABD, so it is assumed the caller
	* will free this ABD.
	*/
	abd_gang_add(aio->io_abd, dio->io_abd,
	B_FALSE);
	}
	}
	next_offset = dio->io_offset + dio->io_size;
	} while (dio != last);
	ASSERT3U(abd_get_size(aio->io_abd), ==, aio->io_size);

	/*
	- * We need to drop the vdev queue's lock during zio_execute() to
	- * avoid a deadlock that we could encounter due to lock order
	- * reversal between vq_lock and io_lock in zio_change_priority().
	+ * Callers must call zio_vdev_io_bypass() and zio_execute() for
	+ * aggregated (parent) I/Os so that we could avoid dropping the
	+ * queue's lock here to avoid a deadlock that we could encounter
	+ * due to lock order reversal between vq_lock and io_lock in
	+ * zio_change_priority().
	*/
	- mutex_exit(&vq->vq_lock);
	- while ((dio = zio_walk_parents(aio, &zl)) != NULL) {
	- ASSERT3U(dio->io_type, ==, aio->io_type);
	-
	- zio_vdev_io_bypass(dio);
	- zio_execute(dio);
	- }
	- mutex_enter(&vq->vq_lock);
	-
	return (aio);
	}

	static zio_t *
	vdev_queue_io_to_issue(vdev_queue_t *vq)
	{
	zio_t zio, aio;
	zio_priority_t p;
	avl_index_t idx;
	avl_tree_t *tree;

	again:
	ASSERT(MUTEX_HELD(&vq->vq_lock));

	p = vdev_queue_class_to_issue(vq);

	if (p == ZIO_PRIORITY_NUM_QUEUEABLE) {
	/* No eligible queued i/os */
	return (NULL);
	}

	/*
	* For LBA-ordered queues (async / scrub / initializing), issue the
	* i/o which follows the most recently issued i/o in LBA (offset) order.
	*
	* For FIFO queues (sync/trim), issue the i/o with the lowest timestamp.
	*/
	tree = vdev_queue_class_tree(vq, p);
	vq->vq_io_search.io_timestamp = 0;
	vq->vq_io_search.io_offset = vq->vq_last_offset - 1;
	VERIFY3P(avl_find(tree, &vq->vq_io_search, &idx), ==, NULL);
	zio = avl_nearest(tree, idx, AVL_AFTER);
	if (zio == NULL)
	zio = avl_first(tree);
	ASSERT3U(zio->io_priority, ==, p);

	aio = vdev_queue_aggregate(vq, zio);
	- if (aio != NULL)
	+ if (aio != NULL) {
	zio = aio;
	- else
	+ } else {
	vdev_queue_io_remove(vq, zio);

	- /*
	- * If the I/O is or was optional and therefore has no data, we need to
	- * simply discard it. We need to drop the vdev queue's lock to avoid a
	- * deadlock that we could encounter since this I/O will complete
	- * immediately.
	- */
	- if (zio->io_flags & ZIO_FLAG_NODATA) {
	- mutex_exit(&vq->vq_lock);
	- zio_vdev_io_bypass(zio);
	- zio_execute(zio);
	- mutex_enter(&vq->vq_lock);
	- goto again;
	+ /*
	+ * If the I/O is or was optional and therefore has no data, we
	+ * need to simply discard it. We need to drop the vdev queue's
	+ * lock to avoid a deadlock that we could encounter since this
	+ * I/O will complete immediately.
	+ */
	+ if (zio->io_flags & ZIO_FLAG_NODATA) {
	+ mutex_exit(&vq->vq_lock);
	+ zio_vdev_io_bypass(zio);
	+ zio_execute(zio);
	+ mutex_enter(&vq->vq_lock);
	+ goto again;
	+ }
	}

	vdev_queue_pending_add(vq, zio);
	vq->vq_last_offset = zio->io_offset + zio->io_size;

	return (zio);
	}

	zio_t *
	vdev_queue_io(zio_t *zio)
	{
	vdev_queue_t *vq = &zio->io_vd->vdev_queue;
	- zio_t *nio;
	+ zio_t dio, nio;
	+ zio_link_t *zl = NULL;

	if (zio->io_flags & ZIO_FLAG_DONT_QUEUE)
	return (zio);

	/*
	* Children i/os inherent their parent's priority, which might
	* not match the child's i/o type. Fix it up here.
	*/
	if (zio->io_type == ZIO_TYPE_READ) {
	ASSERT(zio->io_priority != ZIO_PRIORITY_TRIM);

	if (zio->io_priority != ZIO_PRIORITY_SYNC_READ &&
	zio->io_priority != ZIO_PRIORITY_ASYNC_READ &&
	zio->io_priority != ZIO_PRIORITY_SCRUB &&
	zio->io_priority != ZIO_PRIORITY_REMOVAL &&
	zio->io_priority != ZIO_PRIORITY_INITIALIZING &&
	zio->io_priority != ZIO_PRIORITY_REBUILD) {
	zio->io_priority = ZIO_PRIORITY_ASYNC_READ;
	}
	} else if (zio->io_type == ZIO_TYPE_WRITE) {
	ASSERT(zio->io_priority != ZIO_PRIORITY_TRIM);

	if (zio->io_priority != ZIO_PRIORITY_SYNC_WRITE &&
	zio->io_priority != ZIO_PRIORITY_ASYNC_WRITE &&
	zio->io_priority != ZIO_PRIORITY_REMOVAL &&
	zio->io_priority != ZIO_PRIORITY_INITIALIZING &&
	zio->io_priority != ZIO_PRIORITY_REBUILD) {
	zio->io_priority = ZIO_PRIORITY_ASYNC_WRITE;
	}
	} else {
	ASSERT(zio->io_type == ZIO_TYPE_TRIM);
	ASSERT(zio->io_priority == ZIO_PRIORITY_TRIM);
	}

	zio->io_flags \|= ZIO_FLAG_DONT_CACHE \| ZIO_FLAG_DONT_QUEUE;
	+ zio->io_timestamp = gethrtime();

	mutex_enter(&vq->vq_lock);
	- zio->io_timestamp = gethrtime();
	vdev_queue_io_add(vq, zio);
	nio = vdev_queue_io_to_issue(vq);
	mutex_exit(&vq->vq_lock);

	if (nio == NULL)
	return (NULL);

	if (nio->io_done == vdev_queue_agg_io_done) {
	+ while ((dio = zio_walk_parents(nio, &zl)) != NULL) {
	+ ASSERT3U(dio->io_type, ==, nio->io_type);
	+ zio_vdev_io_bypass(dio);
	+ zio_execute(dio);
	+ }
	zio_nowait(nio);
	return (NULL);
	}

	return (nio);
	}

	void
	vdev_queue_io_done(zio_t *zio)
	{
	vdev_queue_t *vq = &zio->io_vd->vdev_queue;
	- zio_t *nio;
	+ zio_t dio, nio;
	+ zio_link_t *zl = NULL;

	- mutex_enter(&vq->vq_lock);
	+ hrtime_t now = gethrtime();
	+ vq->vq_io_complete_ts = now;
	+ vq->vq_io_delta_ts = zio->io_delta = now - zio->io_timestamp;

	+ mutex_enter(&vq->vq_lock);
	vdev_queue_pending_remove(vq, zio);

	- zio->io_delta = gethrtime() - zio->io_timestamp;
	- vq->vq_io_complete_ts = gethrtime();
	- vq->vq_io_delta_ts = vq->vq_io_complete_ts - zio->io_timestamp;
	-
	while ((nio = vdev_queue_io_to_issue(vq)) != NULL) {
	mutex_exit(&vq->vq_lock);
	if (nio->io_done == vdev_queue_agg_io_done) {
	+ while ((dio = zio_walk_parents(nio, &zl)) != NULL) {
	+ ASSERT3U(dio->io_type, ==, nio->io_type);
	+ zio_vdev_io_bypass(dio);
	+ zio_execute(dio);
	+ }
	zio_nowait(nio);
	} else {
	zio_vdev_io_reissue(nio);
	zio_execute(nio);
	}
	mutex_enter(&vq->vq_lock);
	}

	mutex_exit(&vq->vq_lock);
	}

	void
	vdev_queue_change_io_priority(zio_t *zio, zio_priority_t priority)
	{
	vdev_queue_t *vq = &zio->io_vd->vdev_queue;
	avl_tree_t *tree;

	/*
	* ZIO_PRIORITY_NOW is used by the vdev cache code and the aggregate zio
	* code to issue IOs without adding them to the vdev queue. In this
	* case, the zio is already going to be issued as quickly as possible
	* and so it doesn't need any reprioritization to help.
	*/
	if (zio->io_priority == ZIO_PRIORITY_NOW)
	return;

	ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
	ASSERT3U(priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);

	if (zio->io_type == ZIO_TYPE_READ) {
	if (priority != ZIO_PRIORITY_SYNC_READ &&
	priority != ZIO_PRIORITY_ASYNC_READ &&
	priority != ZIO_PRIORITY_SCRUB)
	priority = ZIO_PRIORITY_ASYNC_READ;
	} else {
	ASSERT(zio->io_type == ZIO_TYPE_WRITE);
	if (priority != ZIO_PRIORITY_SYNC_WRITE &&
	priority != ZIO_PRIORITY_ASYNC_WRITE)
	priority = ZIO_PRIORITY_ASYNC_WRITE;
	}

	mutex_enter(&vq->vq_lock);

	/*
	* If the zio is in none of the queues we can simply change
	* the priority. If the zio is waiting to be submitted we must
	* remove it from the queue and re-insert it with the new priority.
	* Otherwise, the zio is currently active and we cannot change its
	* priority.
	*/
	tree = vdev_queue_class_tree(vq, zio->io_priority);
	if (avl_find(tree, zio, NULL) == zio) {
	avl_remove(vdev_queue_class_tree(vq, zio->io_priority), zio);
	zio->io_priority = priority;
	avl_add(vdev_queue_class_tree(vq, zio->io_priority), zio);
	} else if (avl_find(&vq->vq_active_tree, zio, NULL) != zio) {
	zio->io_priority = priority;
	}

	mutex_exit(&vq->vq_lock);
	}

	/*
	* As these two methods are only used for load calculations we're not
	* concerned if we get an incorrect value on 32bit platforms due to lack of
	* vq_lock mutex use here, instead we prefer to keep it lock free for
	* performance.
	*/
	int
	vdev_queue_length(vdev_t *vd)
	{
	return (avl_numnodes(&vd->vdev_queue.vq_active_tree));
	}

	uint64_t
	vdev_queue_last_offset(vdev_t *vd)
	{
	return (vd->vdev_queue.vq_last_offset);
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, aggregation_limit, INT, ZMOD_RW,
	"Max vdev I/O aggregation size");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, aggregation_limit_non_rotating, INT, ZMOD_RW,
	"Max vdev I/O aggregation size for non-rotating media");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, aggregate_trim, INT, ZMOD_RW,
	"Allow TRIM I/O to be aggregated");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, read_gap_limit, INT, ZMOD_RW,
	"Aggregate read I/O over gap");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, write_gap_limit, INT, ZMOD_RW,
	"Aggregate write I/O over gap");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, max_active, INT, ZMOD_RW,
	"Maximum number of active I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, async_write_active_max_dirty_percent, INT, ZMOD_RW,
	"Async write concurrency max threshold");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, async_write_active_min_dirty_percent, INT, ZMOD_RW,
	"Async write concurrency min threshold");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, async_read_max_active, INT, ZMOD_RW,
	"Max active async read I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, async_read_min_active, INT, ZMOD_RW,
	"Min active async read I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, async_write_max_active, INT, ZMOD_RW,
	"Max active async write I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, async_write_min_active, INT, ZMOD_RW,
	"Min active async write I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, initializing_max_active, INT, ZMOD_RW,
	"Max active initializing I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, initializing_min_active, INT, ZMOD_RW,
	"Min active initializing I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, removal_max_active, INT, ZMOD_RW,
	"Max active removal I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, removal_min_active, INT, ZMOD_RW,
	"Min active removal I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, scrub_max_active, INT, ZMOD_RW,
	"Max active scrub I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, scrub_min_active, INT, ZMOD_RW,
	"Min active scrub I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, sync_read_max_active, INT, ZMOD_RW,
	"Max active sync read I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, sync_read_min_active, INT, ZMOD_RW,
	"Min active sync read I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, sync_write_max_active, INT, ZMOD_RW,
	"Max active sync write I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, sync_write_min_active, INT, ZMOD_RW,
	"Min active sync write I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, trim_max_active, INT, ZMOD_RW,
	"Max active trim/discard I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, trim_min_active, INT, ZMOD_RW,
	"Min active trim/discard I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, rebuild_max_active, INT, ZMOD_RW,
	"Max active rebuild I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, rebuild_min_active, INT, ZMOD_RW,
	"Min active rebuild I/Os per vdev");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, nia_credit, INT, ZMOD_RW,
	"Number of non-interactive I/Os to allow in sequence");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, nia_delay, INT, ZMOD_RW,
	"Number of non-interactive I/Os before _max_active");

	ZFS_MODULE_PARAM(zfs_vdev, zfs_vdev_, queue_depth_pct, INT, ZMOD_RW,
	"Queue depth percentage for each top-level vdev");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/vdev_raidz_math.c b/sys/contrib/openzfs/module/zfs/vdev_raidz_math.c
	index 25d76970e99a..2ce0dc5cc7d2 100644
	--- a/sys/contrib/openzfs/module/zfs/vdev_raidz_math.c
	+++ b/sys/contrib/openzfs/module/zfs/vdev_raidz_math.c
	@@ -1,666 +1,673 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (C) 2016 Gvozden Nešković. All rights reserved.
	*/

	#include <sys/zfs_context.h>
	#include <sys/types.h>
	#include <sys/zio.h>
	#include <sys/debug.h>
	#include <sys/zfs_debug.h>
	#include <sys/vdev_raidz.h>
	#include <sys/vdev_raidz_impl.h>
	#include <sys/simd.h>

	/* Opaque implementation with NULL methods to represent original methods */
	static const raidz_impl_ops_t vdev_raidz_original_impl = {
	.name = "original",
	.is_supported = raidz_will_scalar_work,
	};

	/* RAIDZ parity op that contain the fastest methods */
	static raidz_impl_ops_t vdev_raidz_fastest_impl = {
	.name = "fastest"
	};

	/* All compiled in implementations */
	const raidz_impl_ops_t *raidz_all_maths[] = {
	&vdev_raidz_original_impl,
	&vdev_raidz_scalar_impl,
	#if defined(__x86_64) && defined(HAVE_SSE2) /* only x86_64 for now */
	&vdev_raidz_sse2_impl,
	#endif
	#if defined(__x86_64) && defined(HAVE_SSSE3) /* only x86_64 for now */
	&vdev_raidz_ssse3_impl,
	#endif
	#if defined(__x86_64) && defined(HAVE_AVX2) /* only x86_64 for now */
	&vdev_raidz_avx2_impl,
	#endif
	#if defined(__x86_64) && defined(HAVE_AVX512F) /* only x86_64 for now */
	&vdev_raidz_avx512f_impl,
	#endif
	#if defined(__x86_64) && defined(HAVE_AVX512BW) /* only x86_64 for now */
	&vdev_raidz_avx512bw_impl,
	#endif
	#if defined(__aarch64__) && !defined(__FreeBSD__)
	&vdev_raidz_aarch64_neon_impl,
	&vdev_raidz_aarch64_neonx2_impl,
	#endif
	#if defined(__powerpc__) && defined(__altivec__)
	&vdev_raidz_powerpc_altivec_impl,
	#endif
	};

	/* Indicate that benchmark has been completed */
	static boolean_t raidz_math_initialized = B_FALSE;

	/* Select raidz implementation */
	#define IMPL_FASTEST (UINT32_MAX)
	#define IMPL_CYCLE (UINT32_MAX - 1)
	#define IMPL_ORIGINAL (0)
	#define IMPL_SCALAR (1)

	#define RAIDZ_IMPL_READ(i) ((volatile uint32_t ) &(i))

	static uint32_t zfs_vdev_raidz_impl = IMPL_SCALAR;
	static uint32_t user_sel_impl = IMPL_FASTEST;

	/* Hold all supported implementations */
	static size_t raidz_supp_impl_cnt = 0;
	static raidz_impl_ops_t *raidz_supp_impl[ARRAY_SIZE(raidz_all_maths)];

	#if defined(_KERNEL)
	/*
	* kstats values for supported implementations
	* Values represent per disk throughput of 8 disk+parity raidz vdev [B/s]
	*/
	static raidz_impl_kstat_t raidz_impl_kstats[ARRAY_SIZE(raidz_all_maths) + 1];

	/* kstat for benchmarked implementations */
	static kstat_t *raidz_math_kstat = NULL;
	#endif

	/*
	* Returns the RAIDZ operations for raidz_map() parity calculations. When
	* a SIMD implementation is not allowed in the current context, then fallback
	* to the fastest generic implementation.
	*/
	const raidz_impl_ops_t *
	vdev_raidz_math_get_ops(void)
	{
	if (!kfpu_allowed())
	return (&vdev_raidz_scalar_impl);

	raidz_impl_ops_t *ops = NULL;
	const uint32_t impl = RAIDZ_IMPL_READ(zfs_vdev_raidz_impl);

	switch (impl) {
	case IMPL_FASTEST:
	ASSERT(raidz_math_initialized);
	ops = &vdev_raidz_fastest_impl;
	break;
	case IMPL_CYCLE:
	/* Cycle through all supported implementations */
	ASSERT(raidz_math_initialized);
	ASSERT3U(raidz_supp_impl_cnt, >, 0);
	static size_t cycle_impl_idx = 0;
	size_t idx = (++cycle_impl_idx) % raidz_supp_impl_cnt;
	ops = raidz_supp_impl[idx];
	break;
	case IMPL_ORIGINAL:
	ops = (raidz_impl_ops_t *)&vdev_raidz_original_impl;
	break;
	case IMPL_SCALAR:
	ops = (raidz_impl_ops_t *)&vdev_raidz_scalar_impl;
	break;
	default:
	ASSERT3U(impl, <, raidz_supp_impl_cnt);
	ASSERT3U(raidz_supp_impl_cnt, >, 0);
	if (impl < ARRAY_SIZE(raidz_all_maths))
	ops = raidz_supp_impl[impl];
	break;
	}

	ASSERT3P(ops, !=, NULL);

	return (ops);
	}

	/*
	* Select parity generation method for raidz_map
	*/
	int
	vdev_raidz_math_generate(raidz_map_t rm, raidz_row_t rr)
	{
	raidz_gen_f gen_parity = NULL;

	switch (raidz_parity(rm)) {
	case 1:
	gen_parity = rm->rm_ops->gen[RAIDZ_GEN_P];
	break;
	case 2:
	gen_parity = rm->rm_ops->gen[RAIDZ_GEN_PQ];
	break;
	case 3:
	gen_parity = rm->rm_ops->gen[RAIDZ_GEN_PQR];
	break;
	default:
	gen_parity = NULL;
	cmn_err(CE_PANIC, "invalid RAID-Z configuration %d",
	raidz_parity(rm));
	break;
	}

	/* if method is NULL execute the original implementation */
	if (gen_parity == NULL)
	return (RAIDZ_ORIGINAL_IMPL);

	gen_parity(rr);

	return (0);
	}

	static raidz_rec_f
	reconstruct_fun_p_sel(raidz_map_t rm, const int parity_valid,
	const int nbaddata)
	{
	if (nbaddata == 1 && parity_valid[CODE_P]) {
	return (rm->rm_ops->rec[RAIDZ_REC_P]);
	}
	return ((raidz_rec_f) NULL);
	}

	static raidz_rec_f
	reconstruct_fun_pq_sel(raidz_map_t rm, const int parity_valid,
	const int nbaddata)
	{
	if (nbaddata == 1) {
	if (parity_valid[CODE_P]) {
	return (rm->rm_ops->rec[RAIDZ_REC_P]);
	} else if (parity_valid[CODE_Q]) {
	return (rm->rm_ops->rec[RAIDZ_REC_Q]);
	}
	} else if (nbaddata == 2 &&
	parity_valid[CODE_P] && parity_valid[CODE_Q]) {
	return (rm->rm_ops->rec[RAIDZ_REC_PQ]);
	}
	return ((raidz_rec_f) NULL);
	}

	static raidz_rec_f
	reconstruct_fun_pqr_sel(raidz_map_t rm, const int parity_valid,
	const int nbaddata)
	{
	if (nbaddata == 1) {
	if (parity_valid[CODE_P]) {
	return (rm->rm_ops->rec[RAIDZ_REC_P]);
	} else if (parity_valid[CODE_Q]) {
	return (rm->rm_ops->rec[RAIDZ_REC_Q]);
	} else if (parity_valid[CODE_R]) {
	return (rm->rm_ops->rec[RAIDZ_REC_R]);
	}
	} else if (nbaddata == 2) {
	if (parity_valid[CODE_P] && parity_valid[CODE_Q]) {
	return (rm->rm_ops->rec[RAIDZ_REC_PQ]);
	} else if (parity_valid[CODE_P] && parity_valid[CODE_R]) {
	return (rm->rm_ops->rec[RAIDZ_REC_PR]);
	} else if (parity_valid[CODE_Q] && parity_valid[CODE_R]) {
	return (rm->rm_ops->rec[RAIDZ_REC_QR]);
	}
	} else if (nbaddata == 3 &&
	parity_valid[CODE_P] && parity_valid[CODE_Q] &&
	parity_valid[CODE_R]) {
	return (rm->rm_ops->rec[RAIDZ_REC_PQR]);
	}
	return ((raidz_rec_f) NULL);
	}

	/*
	* Select data reconstruction method for raidz_map
	* @parity_valid - Parity validity flag
	* @dt - Failed data index array
	* @nbaddata - Number of failed data columns
	*/
	int
	vdev_raidz_math_reconstruct(raidz_map_t rm, raidz_row_t rr,
	const int parity_valid, const int dt, const int nbaddata)
	{
	raidz_rec_f rec_fn = NULL;

	switch (raidz_parity(rm)) {
	case PARITY_P:
	rec_fn = reconstruct_fun_p_sel(rm, parity_valid, nbaddata);
	break;
	case PARITY_PQ:
	rec_fn = reconstruct_fun_pq_sel(rm, parity_valid, nbaddata);
	break;
	case PARITY_PQR:
	rec_fn = reconstruct_fun_pqr_sel(rm, parity_valid, nbaddata);
	break;
	default:
	cmn_err(CE_PANIC, "invalid RAID-Z configuration %d",
	raidz_parity(rm));
	break;
	}

	if (rec_fn == NULL)
	return (RAIDZ_ORIGINAL_IMPL);
	else
	return (rec_fn(rr, dt));
	}

	const char *raidz_gen_name[] = {
	"gen_p", "gen_pq", "gen_pqr"
	};
	const char *raidz_rec_name[] = {
	"rec_p", "rec_q", "rec_r",
	"rec_pq", "rec_pr", "rec_qr", "rec_pqr"
	};

	#if defined(_KERNEL)

	#define RAIDZ_KSTAT_LINE_LEN (17 + 10*12 + 1)

	static int
	raidz_math_kstat_headers(char *buf, size_t size)
	{
	int i;
	ssize_t off;

	ASSERT3U(size, >=, RAIDZ_KSTAT_LINE_LEN);

	off = snprintf(buf, size, "%-17s", "implementation");

	for (i = 0; i < ARRAY_SIZE(raidz_gen_name); i++)
	off += snprintf(buf + off, size - off, "%-16s",
	raidz_gen_name[i]);

	for (i = 0; i < ARRAY_SIZE(raidz_rec_name); i++)
	off += snprintf(buf + off, size - off, "%-16s",
	raidz_rec_name[i]);

	(void) snprintf(buf + off, size - off, "\n");

	return (0);
	}

	static int
	raidz_math_kstat_data(char buf, size_t size, void data)
	{
	raidz_impl_kstat_t *fstat = &raidz_impl_kstats[raidz_supp_impl_cnt];
	raidz_impl_kstat_t cstat = (raidz_impl_kstat_t )data;
	ssize_t off = 0;
	int i;

	ASSERT3U(size, >=, RAIDZ_KSTAT_LINE_LEN);

	if (cstat == fstat) {
	off += snprintf(buf + off, size - off, "%-17s", "fastest");

	for (i = 0; i < ARRAY_SIZE(raidz_gen_name); i++) {
	int id = fstat->gen[i];
	off += snprintf(buf + off, size - off, "%-16s",
	raidz_supp_impl[id]->name);
	}
	for (i = 0; i < ARRAY_SIZE(raidz_rec_name); i++) {
	int id = fstat->rec[i];
	off += snprintf(buf + off, size - off, "%-16s",
	raidz_supp_impl[id]->name);
	}
	} else {
	ptrdiff_t id = cstat - raidz_impl_kstats;

	off += snprintf(buf + off, size - off, "%-17s",
	raidz_supp_impl[id]->name);

	for (i = 0; i < ARRAY_SIZE(raidz_gen_name); i++)
	off += snprintf(buf + off, size - off, "%-16llu",
	(u_longlong_t)cstat->gen[i]);

	for (i = 0; i < ARRAY_SIZE(raidz_rec_name); i++)
	off += snprintf(buf + off, size - off, "%-16llu",
	(u_longlong_t)cstat->rec[i]);
	}

	(void) snprintf(buf + off, size - off, "\n");

	return (0);
	}

	static void *
	raidz_math_kstat_addr(kstat_t *ksp, loff_t n)
	{
	if (n <= raidz_supp_impl_cnt)
	ksp->ks_private = (void *) (raidz_impl_kstats + n);
	else
	ksp->ks_private = NULL;

	return (ksp->ks_private);
	}

	#define BENCH_D_COLS (8ULL)
	#define BENCH_COLS (BENCH_D_COLS + PARITY_PQR)
	#define BENCH_ZIO_SIZE (1ULL << SPA_OLD_MAXBLOCKSHIFT) /* 128 kiB */
	#define BENCH_NS MSEC2NSEC(1) /* 1ms */

	typedef void (benchmark_fn)(raidz_map_t rm, const int fn);

	static void
	benchmark_gen_impl(raidz_map_t *rm, const int fn)
	{
	(void) fn;
	vdev_raidz_generate_parity(rm);
	}

	static void
	benchmark_rec_impl(raidz_map_t *rm, const int fn)
	{
	static const int rec_tgt[7][3] = {
	{1, 2, 3}, /* rec_p: bad QR & D[0] */
	{0, 2, 3}, /* rec_q: bad PR & D[0] */
	{0, 1, 3}, /* rec_r: bad PQ & D[0] */
	{2, 3, 4}, /* rec_pq: bad R & D[0][1] */
	{1, 3, 4}, /* rec_pr: bad Q & D[0][1] */
	{0, 3, 4}, /* rec_qr: bad P & D[0][1] */
	{3, 4, 5} /* rec_pqr: bad & D[0][1][2] */
	};

	vdev_raidz_reconstruct(rm, rec_tgt[fn], 3);
	}

	/*
	* Benchmarking of all supported implementations (raidz_supp_impl_cnt)
	* is performed by setting the rm_ops pointer and calling the top level
	* generate/reconstruct methods of bench_rm.
	*/
	static void
	benchmark_raidz_impl(raidz_map_t *bench_rm, const int fn, benchmark_fn bench_fn)
	{
	uint64_t run_cnt, speed, best_speed = 0;
	hrtime_t t_start, t_diff;
	raidz_impl_ops_t *curr_impl;
	raidz_impl_kstat_t *fstat = &raidz_impl_kstats[raidz_supp_impl_cnt];
	int impl, i;

	for (impl = 0; impl < raidz_supp_impl_cnt; impl++) {
	/* set an implementation to benchmark */
	curr_impl = raidz_supp_impl[impl];
	bench_rm->rm_ops = curr_impl;

	run_cnt = 0;
	t_start = gethrtime();

	do {
	for (i = 0; i < 5; i++, run_cnt++)
	bench_fn(bench_rm, fn);

	t_diff = gethrtime() - t_start;
	} while (t_diff < BENCH_NS);

	speed = run_cnt * BENCH_ZIO_SIZE * NANOSEC;
	speed /= (t_diff * BENCH_COLS);

	if (bench_fn == benchmark_gen_impl)
	raidz_impl_kstats[impl].gen[fn] = speed;
	else
	raidz_impl_kstats[impl].rec[fn] = speed;

	/* Update fastest implementation method */
	if (speed > best_speed) {
	best_speed = speed;

	if (bench_fn == benchmark_gen_impl) {
	fstat->gen[fn] = impl;
	vdev_raidz_fastest_impl.gen[fn] =
	curr_impl->gen[fn];
	} else {
	fstat->rec[fn] = impl;
	vdev_raidz_fastest_impl.rec[fn] =
	curr_impl->rec[fn];
	}
	}
	}
	}
	#endif

	/*
	* Initialize and benchmark all supported implementations.
	*/
	static void
	benchmark_raidz(void)
	{
	raidz_impl_ops_t *curr_impl;
	int i, c;

	/* Move supported impl into raidz_supp_impl */
	for (i = 0, c = 0; i < ARRAY_SIZE(raidz_all_maths); i++) {
	curr_impl = (raidz_impl_ops_t *)raidz_all_maths[i];

	if (curr_impl->init)
	curr_impl->init();

	if (curr_impl->is_supported())
	raidz_supp_impl[c++] = (raidz_impl_ops_t *)curr_impl;
	}
	membar_producer(); /* complete raidz_supp_impl[] init */
	raidz_supp_impl_cnt = c; /* number of supported impl */

	#if defined(_KERNEL)
	+ abd_t *pabd;
	zio_t *bench_zio = NULL;
	raidz_map_t *bench_rm = NULL;
	uint64_t bench_parity;

	/* Fake a zio and run the benchmark on a warmed up buffer */
	bench_zio = kmem_zalloc(sizeof (zio_t), KM_SLEEP);
	bench_zio->io_offset = 0;
	bench_zio->io_size = BENCH_ZIO_SIZE; /* only data columns */
	bench_zio->io_abd = abd_alloc_linear(BENCH_ZIO_SIZE, B_TRUE);
	memset(abd_to_buf(bench_zio->io_abd), 0xAA, BENCH_ZIO_SIZE);

	/* Benchmark parity generation methods */
	for (int fn = 0; fn < RAIDZ_GEN_NUM; fn++) {
	bench_parity = fn + 1;
	/* New raidz_map is needed for each generate_p/q/r */
	bench_rm = vdev_raidz_map_alloc(bench_zio, SPA_MINBLOCKSHIFT,
	BENCH_D_COLS + bench_parity, bench_parity);

	benchmark_raidz_impl(bench_rm, fn, benchmark_gen_impl);

	vdev_raidz_map_free(bench_rm);
	}

	/* Benchmark data reconstruction methods */
	bench_rm = vdev_raidz_map_alloc(bench_zio, SPA_MINBLOCKSHIFT,
	BENCH_COLS, PARITY_PQR);

	+ /* Ensure that fake parity blocks are initialized */
	+ for (c = 0; c < bench_rm->rm_row[0]->rr_firstdatacol; c++) {
	+ pabd = bench_rm->rm_row[0]->rr_col[c].rc_abd;
	+ memset(abd_to_buf(pabd), 0xAA, abd_get_size(pabd));
	+ }
	+
	for (int fn = 0; fn < RAIDZ_REC_NUM; fn++)
	benchmark_raidz_impl(bench_rm, fn, benchmark_rec_impl);

	vdev_raidz_map_free(bench_rm);

	/* cleanup the bench zio */
	abd_free(bench_zio->io_abd);
	kmem_free(bench_zio, sizeof (zio_t));
	#else
	/*
	* Skip the benchmark in user space to avoid impacting libzpool
	* consumers (zdb, zhack, zinject, ztest). The last implementation
	* is assumed to be the fastest and used by default.
	*/
	memcpy(&vdev_raidz_fastest_impl,
	raidz_supp_impl[raidz_supp_impl_cnt - 1],
	sizeof (vdev_raidz_fastest_impl));
	strcpy(vdev_raidz_fastest_impl.name, "fastest");
	#endif /* _KERNEL */
	}

	void
	vdev_raidz_math_init(void)
	{
	/* Determine the fastest available implementation. */
	benchmark_raidz();

	#if defined(_KERNEL)
	/* Install kstats for all implementations */
	raidz_math_kstat = kstat_create("zfs", 0, "vdev_raidz_bench", "misc",
	KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
	if (raidz_math_kstat != NULL) {
	raidz_math_kstat->ks_data = NULL;
	raidz_math_kstat->ks_ndata = UINT32_MAX;
	kstat_set_raw_ops(raidz_math_kstat,
	raidz_math_kstat_headers,
	raidz_math_kstat_data,
	raidz_math_kstat_addr);
	kstat_install(raidz_math_kstat);
	}
	#endif

	/* Finish initialization */
	atomic_swap_32(&zfs_vdev_raidz_impl, user_sel_impl);
	raidz_math_initialized = B_TRUE;
	}

	void
	vdev_raidz_math_fini(void)
	{
	raidz_impl_ops_t const *curr_impl;

	#if defined(_KERNEL)
	if (raidz_math_kstat != NULL) {
	kstat_delete(raidz_math_kstat);
	raidz_math_kstat = NULL;
	}
	#endif

	for (int i = 0; i < ARRAY_SIZE(raidz_all_maths); i++) {
	curr_impl = raidz_all_maths[i];
	if (curr_impl->fini)
	curr_impl->fini();
	}
	}

	static const struct {
	char *name;
	uint32_t sel;
	} math_impl_opts[] = {
	{ "cycle", IMPL_CYCLE },
	{ "fastest", IMPL_FASTEST },
	{ "original", IMPL_ORIGINAL },
	{ "scalar", IMPL_SCALAR }
	};

	/*
	* Function sets desired raidz implementation.
	*
	* If we are called before init(), user preference will be saved in
	* user_sel_impl, and applied in later init() call. This occurs when module
	* parameter is specified on module load. Otherwise, directly update
	* zfs_vdev_raidz_impl.
	*
	* @val Name of raidz implementation to use
	* @param Unused.
	*/
	int
	vdev_raidz_impl_set(const char *val)
	{
	int err = -EINVAL;
	char req_name[RAIDZ_IMPL_NAME_MAX];
	uint32_t impl = RAIDZ_IMPL_READ(user_sel_impl);
	size_t i;

	/* sanitize input */
	i = strnlen(val, RAIDZ_IMPL_NAME_MAX);
	if (i == 0 \|\| i == RAIDZ_IMPL_NAME_MAX)
	return (err);

	strlcpy(req_name, val, RAIDZ_IMPL_NAME_MAX);
	while (i > 0 && !!isspace(req_name[i-1]))
	i--;
	req_name[i] = '\0';

	/* Check mandatory options */
	for (i = 0; i < ARRAY_SIZE(math_impl_opts); i++) {
	if (strcmp(req_name, math_impl_opts[i].name) == 0) {
	impl = math_impl_opts[i].sel;
	err = 0;
	break;
	}
	}

	/* check all supported impl if init() was already called */
	if (err != 0 && raidz_math_initialized) {
	/* check all supported implementations */
	for (i = 0; i < raidz_supp_impl_cnt; i++) {
	if (strcmp(req_name, raidz_supp_impl[i]->name) == 0) {
	impl = i;
	err = 0;
	break;
	}
	}
	}

	if (err == 0) {
	if (raidz_math_initialized)
	atomic_swap_32(&zfs_vdev_raidz_impl, impl);
	else
	atomic_swap_32(&user_sel_impl, impl);
	}

	return (err);
	}

	#if defined(_KERNEL) && defined(__linux__)

	static int
	zfs_vdev_raidz_impl_set(const char val, zfs_kernel_param_t kp)
	{
	return (vdev_raidz_impl_set(val));
	}

	static int
	zfs_vdev_raidz_impl_get(char buffer, zfs_kernel_param_t kp)
	{
	int i, cnt = 0;
	char *fmt;
	const uint32_t impl = RAIDZ_IMPL_READ(zfs_vdev_raidz_impl);

	ASSERT(raidz_math_initialized);

	/* list mandatory options */
	for (i = 0; i < ARRAY_SIZE(math_impl_opts) - 2; i++) {
	fmt = (impl == math_impl_opts[i].sel) ? "[%s] " : "%s ";
	cnt += sprintf(buffer + cnt, fmt, math_impl_opts[i].name);
	}

	/* list all supported implementations */
	for (i = 0; i < raidz_supp_impl_cnt; i++) {
	fmt = (i == impl) ? "[%s] " : "%s ";
	cnt += sprintf(buffer + cnt, fmt, raidz_supp_impl[i]->name);
	}

	return (cnt);
	}

	module_param_call(zfs_vdev_raidz_impl, zfs_vdev_raidz_impl_set,
	zfs_vdev_raidz_impl_get, NULL, 0644);
	MODULE_PARM_DESC(zfs_vdev_raidz_impl, "Select raidz implementation.");
	#endif
	diff --git a/sys/contrib/openzfs/module/zfs/zcp_synctask.c b/sys/contrib/openzfs/module/zfs/zcp_synctask.c
	index 4e0fa0d85cbf..c6ade59b9ced 100644
	--- a/sys/contrib/openzfs/module/zfs/zcp_synctask.c
	+++ b/sys/contrib/openzfs/module/zfs/zcp_synctask.c
	@@ -1,544 +1,549 @@
	/*
	* CDDL HEADER START
	*
	* This file and its contents are supplied under the terms of the
	* Common Development and Distribution License ("CDDL"), version 1.0.
	* You may only use this file in accordance with the terms of version
	* 1.0 of the CDDL.
	*
	* A full copy of the text of the CDDL should have accompanied this
	* source. A copy of the CDDL is also available via the Internet at
	* http://www.illumos.org/license/CDDL.
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2016, 2017 by Delphix. All rights reserved.
	* Copyright (c) 2019, 2020 by Christian Schwarz. All rights reserved.
	* Copyright 2020 Joyent, Inc.
	*/

	#include <sys/lua/lua.h>
	#include <sys/lua/lauxlib.h>

	#include <sys/zcp.h>
	#include <sys/zcp_set.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_pool.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_synctask.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_bookmark.h>
	#include <sys/dsl_destroy.h>
	#include <sys/dmu_objset.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfeature.h>
	#include <sys/metaslab.h>

	#define DST_AVG_BLKSHIFT 14

	typedef struct zcp_inherit_prop_arg {
	lua_State *zipa_state;
	const char *zipa_prop;
	dsl_props_set_arg_t zipa_dpsa;
	} zcp_inherit_prop_arg_t;

	typedef int (zcp_synctask_func_t)(lua_State , boolean_t, nvlist_t );
	typedef struct zcp_synctask_info {
	const char *name;
	zcp_synctask_func_t *func;
	const zcp_arg_t pargs[4];
	const zcp_arg_t kwargs[2];
	zfs_space_check_t space_check;
	int blocks_modified;
	} zcp_synctask_info_t;

	+static void
	+zcp_synctask_cleanup(void *arg)
	+{
	+ fnvlist_free(arg);
	+}
	+
	/*
	* Generic synctask interface for channel program syncfuncs.
	*
	* To perform some action in syncing context, we'd generally call
	* dsl_sync_task(), but since the Lua script is already running inside a
	* synctask we need to leave out some actions (such as acquiring the config
	* rwlock and performing space checks).
	*
	* If 'sync' is false, executes a dry run and returns the error code.
	*
	* If we are not running in syncing context and we are not doing a dry run
	* (meaning we are running a zfs.sync function in open-context) then we
	* return a Lua error.
	*
	* This function also handles common fatal error cases for channel program
	* library functions. If a fatal error occurs, err_dsname will be the dataset
	* name reported in error messages, if supplied.
	*/
	static int
	zcp_sync_task(lua_State state, dsl_checkfunc_t checkfunc,
	dsl_syncfunc_t syncfunc, void arg, boolean_t sync, const char *err_dsname)
	{
	int err;
	zcp_run_info_t *ri = zcp_run_info(state);

	err = checkfunc(arg, ri->zri_tx);
	if (!sync)
	return (err);

	if (!ri->zri_sync) {
	return (luaL_error(state, "running functions from the zfs.sync "
	"submodule requires passing sync=TRUE to "
	"lzc_channel_program() (i.e. do not specify the \"-n\" "
	"command line argument)"));
	}

	if (err == 0) {
	syncfunc(arg, ri->zri_tx);
	} else if (err == EIO) {
	if (err_dsname != NULL) {
	return (luaL_error(state,
	"I/O error while accessing dataset '%s'",
	err_dsname));
	} else {
	return (luaL_error(state,
	"I/O error while accessing dataset."));
	}
	}

	return (err);
	}


	static int zcp_synctask_destroy(lua_State , boolean_t, nvlist_t );
	static zcp_synctask_info_t zcp_synctask_destroy_info = {
	.name = "destroy",
	.func = zcp_synctask_destroy,
	.pargs = {
	{.za_name = "filesystem \| snapshot", .za_lua_type = LUA_TSTRING},
	{NULL, 0}
	},
	.kwargs = {
	{.za_name = "defer", .za_lua_type = LUA_TBOOLEAN},
	{NULL, 0}
	},
	.space_check = ZFS_SPACE_CHECK_DESTROY,
	.blocks_modified = 0
	};

	/* ARGSUSED */
	static int
	zcp_synctask_destroy(lua_State state, boolean_t sync, nvlist_t err_details)
	{
	int err;
	const char *dsname = lua_tostring(state, 1);

	boolean_t issnap = (strchr(dsname, '@') != NULL);

	if (!issnap && !lua_isnil(state, 2)) {
	return (luaL_error(state,
	"'deferred' kwarg only supported for snapshots: %s",
	dsname));
	}

	if (issnap) {
	dsl_destroy_snapshot_arg_t ddsa = { 0 };
	ddsa.ddsa_name = dsname;
	if (!lua_isnil(state, 2)) {
	ddsa.ddsa_defer = lua_toboolean(state, 2);
	} else {
	ddsa.ddsa_defer = B_FALSE;
	}

	err = zcp_sync_task(state, dsl_destroy_snapshot_check,
	dsl_destroy_snapshot_sync, &ddsa, sync, dsname);
	} else {
	dsl_destroy_head_arg_t ddha = { 0 };
	ddha.ddha_name = dsname;

	err = zcp_sync_task(state, dsl_destroy_head_check,
	dsl_destroy_head_sync, &ddha, sync, dsname);
	}

	return (err);
	}

	static int zcp_synctask_promote(lua_State , boolean_t, nvlist_t );
	static zcp_synctask_info_t zcp_synctask_promote_info = {
	.name = "promote",
	.func = zcp_synctask_promote,
	.pargs = {
	{.za_name = "clone", .za_lua_type = LUA_TSTRING},
	{NULL, 0}
	},
	.kwargs = {
	{NULL, 0}
	},
	.space_check = ZFS_SPACE_CHECK_RESERVED,
	.blocks_modified = 3
	};

	static int
	zcp_synctask_promote(lua_State state, boolean_t sync, nvlist_t err_details)
	{
	int err;
	dsl_dataset_promote_arg_t ddpa = { 0 };
	const char *dsname = lua_tostring(state, 1);
	zcp_run_info_t *ri = zcp_run_info(state);

	ddpa.ddpa_clonename = dsname;
	ddpa.err_ds = err_details;
	ddpa.cr = ri->zri_cred;
	ddpa.proc = ri->zri_proc;

	/*
	* If there was a snapshot name conflict, then err_ds will be filled
	* with a list of conflicting snapshot names.
	*/
	err = zcp_sync_task(state, dsl_dataset_promote_check,
	dsl_dataset_promote_sync, &ddpa, sync, dsname);

	return (err);
	}

	static int zcp_synctask_rollback(lua_State , boolean_t, nvlist_t err_details);
	static zcp_synctask_info_t zcp_synctask_rollback_info = {
	.name = "rollback",
	.func = zcp_synctask_rollback,
	.space_check = ZFS_SPACE_CHECK_RESERVED,
	.blocks_modified = 1,
	.pargs = {
	{.za_name = "filesystem", .za_lua_type = LUA_TSTRING},
	{0, 0}
	},
	.kwargs = {
	{0, 0}
	}
	};

	static int
	zcp_synctask_rollback(lua_State state, boolean_t sync, nvlist_t err_details)
	{
	int err;
	const char *dsname = lua_tostring(state, 1);
	dsl_dataset_rollback_arg_t ddra = { 0 };

	ddra.ddra_fsname = dsname;
	ddra.ddra_result = err_details;

	err = zcp_sync_task(state, dsl_dataset_rollback_check,
	dsl_dataset_rollback_sync, &ddra, sync, dsname);

	return (err);
	}

	static int zcp_synctask_snapshot(lua_State , boolean_t, nvlist_t );
	static zcp_synctask_info_t zcp_synctask_snapshot_info = {
	.name = "snapshot",
	.func = zcp_synctask_snapshot,
	.pargs = {
	{.za_name = "filesystem@snapname \| volume@snapname",
	.za_lua_type = LUA_TSTRING},
	{NULL, 0}
	},
	.kwargs = {
	{NULL, 0}
	},
	.space_check = ZFS_SPACE_CHECK_NORMAL,
	.blocks_modified = 3
	};

	/* ARGSUSED */
	static int
	zcp_synctask_snapshot(lua_State state, boolean_t sync, nvlist_t err_details)
	{
	int err;
	dsl_dataset_snapshot_arg_t ddsa = { 0 };
	const char *dsname = lua_tostring(state, 1);
	zcp_run_info_t *ri = zcp_run_info(state);

	/*
	* On old pools, the ZIL must not be active when a snapshot is created,
	* but we can't suspend the ZIL because we're already in syncing
	* context.
	*/
	if (spa_version(ri->zri_pool->dp_spa) < SPA_VERSION_FAST_SNAP) {
	return (SET_ERROR(ENOTSUP));
	}

	/*
	* We only allow for a single snapshot rather than a list, so the
	* error list output is unnecessary.
	*/
	ddsa.ddsa_errors = NULL;
	ddsa.ddsa_props = NULL;
	ddsa.ddsa_cr = ri->zri_cred;
	ddsa.ddsa_proc = ri->zri_proc;
	ddsa.ddsa_snaps = fnvlist_alloc();
	fnvlist_add_boolean(ddsa.ddsa_snaps, dsname);

	zcp_cleanup_handler_t *zch = zcp_register_cleanup(state,
	- (zcp_cleanup_t *)&fnvlist_free, ddsa.ddsa_snaps);
	+ zcp_synctask_cleanup, ddsa.ddsa_snaps);

	err = zcp_sync_task(state, dsl_dataset_snapshot_check,
	dsl_dataset_snapshot_sync, &ddsa, sync, dsname);

	if (err == 0) {
	/*
	* We may need to create a new device minor node for this
	* dataset (if it is a zvol and the "snapdev" property is set).
	* Save it in the nvlist so that it can be processed in open
	* context.
	*/
	fnvlist_add_boolean(ri->zri_new_zvols, dsname);
	}

	zcp_deregister_cleanup(state, zch);
	fnvlist_free(ddsa.ddsa_snaps);

	return (err);
	}

	static int zcp_synctask_inherit_prop(lua_State *, boolean_t,
	nvlist_t *err_details);
	static zcp_synctask_info_t zcp_synctask_inherit_prop_info = {
	.name = "inherit",
	.func = zcp_synctask_inherit_prop,
	.space_check = ZFS_SPACE_CHECK_RESERVED,
	.blocks_modified = 2, /* 2 * numprops */
	.pargs = {
	{ .za_name = "dataset", .za_lua_type = LUA_TSTRING },
	{ .za_name = "property", .za_lua_type = LUA_TSTRING },
	{ NULL, 0 }
	},
	.kwargs = {
	{ NULL, 0 }
	},
	};

	static int
	zcp_synctask_inherit_prop_check(void arg, dmu_tx_t tx)
	{
	zcp_inherit_prop_arg_t *args = arg;
	zfs_prop_t prop = zfs_name_to_prop(args->zipa_prop);

	if (prop == ZPROP_INVAL) {
	if (zfs_prop_user(args->zipa_prop))
	return (0);

	return (EINVAL);
	}

	if (zfs_prop_readonly(prop))
	return (EINVAL);

	if (!zfs_prop_inheritable(prop))
	return (EINVAL);

	return (dsl_props_set_check(&args->zipa_dpsa, tx));
	}

	static void
	zcp_synctask_inherit_prop_sync(void arg, dmu_tx_t tx)
	{
	zcp_inherit_prop_arg_t *args = arg;
	dsl_props_set_arg_t *dpsa = &args->zipa_dpsa;

	dsl_props_set_sync(dpsa, tx);
	}

	static int
	zcp_synctask_inherit_prop(lua_State *state, boolean_t sync,
	nvlist_t *err_details)
	{
	int err;
	zcp_inherit_prop_arg_t zipa = { 0 };
	dsl_props_set_arg_t *dpsa = &zipa.zipa_dpsa;

	const char *dsname = lua_tostring(state, 1);
	const char *prop = lua_tostring(state, 2);

	zipa.zipa_state = state;
	zipa.zipa_prop = prop;
	dpsa->dpsa_dsname = dsname;
	dpsa->dpsa_source = ZPROP_SRC_INHERITED;
	dpsa->dpsa_props = fnvlist_alloc();
	fnvlist_add_boolean(dpsa->dpsa_props, prop);

	zcp_cleanup_handler_t *zch = zcp_register_cleanup(state,
	- (zcp_cleanup_t *)&fnvlist_free, dpsa->dpsa_props);
	+ zcp_synctask_cleanup, dpsa->dpsa_props);

	err = zcp_sync_task(state, zcp_synctask_inherit_prop_check,
	zcp_synctask_inherit_prop_sync, &zipa, sync, dsname);

	zcp_deregister_cleanup(state, zch);
	fnvlist_free(dpsa->dpsa_props);

	return (err);
	}

	static int zcp_synctask_bookmark(lua_State , boolean_t, nvlist_t );
	static zcp_synctask_info_t zcp_synctask_bookmark_info = {
	.name = "bookmark",
	.func = zcp_synctask_bookmark,
	.pargs = {
	{.za_name = "snapshot \| bookmark", .za_lua_type = LUA_TSTRING},
	{.za_name = "bookmark", .za_lua_type = LUA_TSTRING},
	{NULL, 0}
	},
	.kwargs = {
	{NULL, 0}
	},
	.space_check = ZFS_SPACE_CHECK_NORMAL,
	.blocks_modified = 1,
	};

	/* ARGSUSED */
	static int
	zcp_synctask_bookmark(lua_State state, boolean_t sync, nvlist_t err_details)
	{
	int err;
	const char *source = lua_tostring(state, 1);
	const char *new = lua_tostring(state, 2);

	nvlist_t *bmarks = fnvlist_alloc();
	fnvlist_add_string(bmarks, new, source);

	zcp_cleanup_handler_t *zch = zcp_register_cleanup(state,
	- (zcp_cleanup_t *)&fnvlist_free, bmarks);
	+ zcp_synctask_cleanup, bmarks);

	dsl_bookmark_create_arg_t dbca = {
	.dbca_bmarks = bmarks,
	.dbca_errors = NULL,
	};
	err = zcp_sync_task(state, dsl_bookmark_create_check,
	dsl_bookmark_create_sync, &dbca, sync, source);

	zcp_deregister_cleanup(state, zch);
	fnvlist_free(bmarks);

	return (err);
	}

	static int zcp_synctask_set_prop(lua_State , boolean_t, nvlist_t err_details);
	static zcp_synctask_info_t zcp_synctask_set_prop_info = {
	.name = "set_prop",
	.func = zcp_synctask_set_prop,
	.space_check = ZFS_SPACE_CHECK_RESERVED,
	.blocks_modified = 2,
	.pargs = {
	{ .za_name = "dataset", .za_lua_type = LUA_TSTRING},
	{ .za_name = "property", .za_lua_type = LUA_TSTRING},
	{ .za_name = "value", .za_lua_type = LUA_TSTRING},
	{ NULL, 0 }
	},
	.kwargs = {
	{ NULL, 0 }
	}
	};

	static int
	zcp_synctask_set_prop(lua_State state, boolean_t sync, nvlist_t err_details)
	{
	int err;
	zcp_set_prop_arg_t args = { 0 };

	const char *dsname = lua_tostring(state, 1);
	const char *prop = lua_tostring(state, 2);
	const char *val = lua_tostring(state, 3);

	args.state = state;
	args.dsname = dsname;
	args.prop = prop;
	args.val = val;

	err = zcp_sync_task(state, zcp_set_prop_check, zcp_set_prop_sync,
	&args, sync, dsname);

	return (err);
	}

	static int
	zcp_synctask_wrapper(lua_State *state)
	{
	int err;
	zcp_cleanup_handler_t *zch;
	int num_ret = 1;
	nvlist_t *err_details = fnvlist_alloc();

	/*
	* Make sure err_details is properly freed, even if a fatal error is
	* thrown during the synctask.
	*/
	- zch = zcp_register_cleanup(state,
	- (zcp_cleanup_t *)&fnvlist_free, err_details);
	+ zch = zcp_register_cleanup(state, zcp_synctask_cleanup, err_details);

	zcp_synctask_info_t *info = lua_touserdata(state, lua_upvalueindex(1));
	boolean_t sync = lua_toboolean(state, lua_upvalueindex(2));

	zcp_run_info_t *ri = zcp_run_info(state);
	dsl_pool_t *dp = ri->zri_pool;

	/* MOS space is triple-dittoed, so we multiply by 3. */
	uint64_t funcspace =
	((uint64_t)info->blocks_modified << DST_AVG_BLKSHIFT) * 3;

	zcp_parse_args(state, info->name, info->pargs, info->kwargs);

	err = 0;
	if (info->space_check != ZFS_SPACE_CHECK_NONE) {
	uint64_t quota = dsl_pool_unreserved_space(dp,
	info->space_check);
	uint64_t used = dsl_dir_phys(dp->dp_root_dir)->dd_used_bytes +
	ri->zri_space_used;

	if (used + funcspace > quota) {
	err = SET_ERROR(ENOSPC);
	}
	}

	if (err == 0) {
	err = info->func(state, sync, err_details);
	}

	if (err == 0) {
	ri->zri_space_used += funcspace;
	}

	lua_pushnumber(state, (lua_Number)err);
	if (fnvlist_num_pairs(err_details) > 0) {
	(void) zcp_nvlist_to_lua(state, err_details, NULL, 0);
	num_ret++;
	}

	zcp_deregister_cleanup(state, zch);
	fnvlist_free(err_details);

	return (num_ret);
	}

	int
	zcp_load_synctask_lib(lua_State *state, boolean_t sync)
	{
	int i;
	zcp_synctask_info_t *zcp_synctask_funcs[] = {
	&zcp_synctask_destroy_info,
	&zcp_synctask_promote_info,
	&zcp_synctask_rollback_info,
	&zcp_synctask_snapshot_info,
	&zcp_synctask_inherit_prop_info,
	&zcp_synctask_bookmark_info,
	&zcp_synctask_set_prop_info,
	NULL
	};

	lua_newtable(state);

	for (i = 0; zcp_synctask_funcs[i] != NULL; i++) {
	zcp_synctask_info_t *info = zcp_synctask_funcs[i];
	lua_pushlightuserdata(state, info);
	lua_pushboolean(state, sync);
	lua_pushcclosure(state, &zcp_synctask_wrapper, 2);
	lua_setfield(state, -2, info->name);
	info++;
	}

	return (1);
	}
	diff --git a/sys/contrib/openzfs/module/zfs/zfs_ioctl.c b/sys/contrib/openzfs/module/zfs/zfs_ioctl.c
	index b0eee81bebe9..3336bb783251 100644
	--- a/sys/contrib/openzfs/module/zfs/zfs_ioctl.c
	+++ b/sys/contrib/openzfs/module/zfs/zfs_ioctl.c
	@@ -1,7715 +1,7712 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Portions Copyright 2011 Martin Matuska
	* Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
	* Portions Copyright 2012 Pawel Jakub Dawidek <pawel@dawidek.net>
	* Copyright (c) 2014, 2016 Joyent, Inc. All rights reserved.
	* Copyright 2016 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2014, Joyent, Inc. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	* Copyright (c) 2013 Steven Hartland. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	* Copyright 2016 Toomas Soome <tsoome@me.com>
	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	* Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
	* Copyright 2017 RackTop Systems.
	* Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
	* Copyright (c) 2019 Datto Inc.
	* Copyright (c) 2019, 2020 by Christian Schwarz. All rights reserved.
	* Copyright (c) 2019, Klara Inc.
	* Copyright (c) 2019, Allan Jude
	*/

	/*
	* ZFS ioctls.
	*
	* This file handles the ioctls to /dev/zfs, used for configuring ZFS storage
	* pools and filesystems, e.g. with /sbin/zfs and /sbin/zpool.
	*
	* There are two ways that we handle ioctls: the legacy way where almost
	* all of the logic is in the ioctl callback, and the new way where most
	* of the marshalling is handled in the common entry point, zfsdev_ioctl().
	*
	* Non-legacy ioctls should be registered by calling
	* zfs_ioctl_register() from zfs_ioctl_init(). The ioctl is invoked
	* from userland by lzc_ioctl().
	*
	* The registration arguments are as follows:
	*
	* const char *name
	* The name of the ioctl. This is used for history logging. If the
	* ioctl returns successfully (the callback returns 0), and allow_log
	* is true, then a history log entry will be recorded with the input &
	* output nvlists. The log entry can be printed with "zpool history -i".
	*
	* zfs_ioc_t ioc
	* The ioctl request number, which userland will pass to ioctl(2).
	* We want newer versions of libzfs and libzfs_core to run against
	* existing zfs kernel modules (i.e. a deferred reboot after an update).
	* Therefore the ioctl numbers cannot change from release to release.
	*
	* zfs_secpolicy_func_t *secpolicy
	* This function will be called before the zfs_ioc_func_t, to
	* determine if this operation is permitted. It should return EPERM
	* on failure, and 0 on success. Checks include determining if the
	* dataset is visible in this zone, and if the user has either all
	* zfs privileges in the zone (SYS_MOUNT), or has been granted permission
	* to do this operation on this dataset with "zfs allow".
	*
	* zfs_ioc_namecheck_t namecheck
	* This specifies what to expect in the zfs_cmd_t:zc_name -- a pool
	* name, a dataset name, or nothing. If the name is not well-formed,
	* the ioctl will fail and the callback will not be called.
	* Therefore, the callback can assume that the name is well-formed
	* (e.g. is null-terminated, doesn't have more than one '@' character,
	* doesn't have invalid characters).
	*
	* zfs_ioc_poolcheck_t pool_check
	* This specifies requirements on the pool state. If the pool does
	* not meet them (is suspended or is readonly), the ioctl will fail
	* and the callback will not be called. If any checks are specified
	* (i.e. it is not POOL_CHECK_NONE), namecheck must not be NO_NAME.
	* Multiple checks can be or-ed together (e.g. POOL_CHECK_SUSPENDED \|
	* POOL_CHECK_READONLY).
	*
	* zfs_ioc_key_t *nvl_keys
	* The list of expected/allowable innvl input keys. This list is used
	* to validate the nvlist input to the ioctl.
	*
	* boolean_t smush_outnvlist
	* If smush_outnvlist is true, then the output is presumed to be a
	* list of errors, and it will be "smushed" down to fit into the
	* caller's buffer, by removing some entries and replacing them with a
	* single "N_MORE_ERRORS" entry indicating how many were removed. See
	* nvlist_smush() for details. If smush_outnvlist is false, and the
	* outnvlist does not fit into the userland-provided buffer, then the
	* ioctl will fail with ENOMEM.
	*
	* zfs_ioc_func_t *func
	* The callback function that will perform the operation.
	*
	* The callback should return 0 on success, or an error number on
	* failure. If the function fails, the userland ioctl will return -1,
	* and errno will be set to the callback's return value. The callback
	* will be called with the following arguments:
	*
	* const char *name
	* The name of the pool or dataset to operate on, from
	* zfs_cmd_t:zc_name. The 'namecheck' argument specifies the
	* expected type (pool, dataset, or none).
	*
	* nvlist_t *innvl
	* The input nvlist, deserialized from zfs_cmd_t:zc_nvlist_src. Or
	* NULL if no input nvlist was provided. Changes to this nvlist are
	* ignored. If the input nvlist could not be deserialized, the
	* ioctl will fail and the callback will not be called.
	*
	* nvlist_t *outnvl
	* The output nvlist, initially empty. The callback can fill it in,
	* and it will be returned to userland by serializing it into
	* zfs_cmd_t:zc_nvlist_dst. If it is non-empty, and serialization
	* fails (e.g. because the caller didn't supply a large enough
	* buffer), then the overall ioctl will fail. See the
	* 'smush_nvlist' argument above for additional behaviors.
	*
	* There are two typical uses of the output nvlist:
	* - To return state, e.g. property values. In this case,
	* smush_outnvlist should be false. If the buffer was not large
	* enough, the caller will reallocate a larger buffer and try
	* the ioctl again.
	*
	* - To return multiple errors from an ioctl which makes on-disk
	* changes. In this case, smush_outnvlist should be true.
	* Ioctls which make on-disk modifications should generally not
	* use the outnvl if they succeed, because the caller can not
	* distinguish between the operation failing, and
	* deserialization failing.
	*
	* IOCTL Interface Errors
	*
	* The following ioctl input errors can be returned:
	* ZFS_ERR_IOC_CMD_UNAVAIL the ioctl number is not supported by kernel
	* ZFS_ERR_IOC_ARG_UNAVAIL an input argument is not supported by kernel
	* ZFS_ERR_IOC_ARG_REQUIRED a required input argument is missing
	* ZFS_ERR_IOC_ARG_BADTYPE an input argument has an invalid type
	*/

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/errno.h>
	#include <sys/uio_impl.h>
	#include <sys/file.h>
	#include <sys/kmem.h>
	#include <sys/cmn_err.h>
	#include <sys/stat.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zfs_quota.h>
	#include <sys/zfs_vfsops.h>
	#include <sys/zfs_znode.h>
	#include <sys/zap.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/vdev.h>
	#include <sys/vdev_impl.h>
	#include <sys/dmu.h>
	#include <sys/dsl_dir.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_deleg.h>
	#include <sys/dmu_objset.h>
	#include <sys/dmu_impl.h>
	#include <sys/dmu_redact.h>
	#include <sys/dmu_tx.h>
	#include <sys/sunddi.h>
	#include <sys/policy.h>
	#include <sys/zone.h>
	#include <sys/nvpair.h>
	#include <sys/pathname.h>
	#include <sys/fs/zfs.h>
	#include <sys/zfs_ctldir.h>
	#include <sys/zfs_dir.h>
	#include <sys/zfs_onexit.h>
	#include <sys/zvol.h>
	#include <sys/dsl_scan.h>
	#include <sys/fm/util.h>
	#include <sys/dsl_crypt.h>
	#include <sys/rrwlock.h>
	#include <sys/zfs_file.h>

	#include <sys/dmu_recv.h>
	#include <sys/dmu_send.h>
	#include <sys/dmu_recv.h>
	#include <sys/dsl_destroy.h>
	#include <sys/dsl_bookmark.h>
	#include <sys/dsl_userhold.h>
	#include <sys/zfeature.h>
	#include <sys/zcp.h>
	#include <sys/zio_checksum.h>
	#include <sys/vdev_removal.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_initialize.h>
	#include <sys/vdev_trim.h>

	#include "zfs_namecheck.h"
	#include "zfs_prop.h"
	#include "zfs_deleg.h"
	#include "zfs_comutil.h"

	#include <sys/lua/lua.h>
	#include <sys/lua/lauxlib.h>
	#include <sys/zfs_ioctl_impl.h>

	kmutex_t zfsdev_state_lock;
	zfsdev_state_t *zfsdev_state_list;

	/*
	* Limit maximum nvlist size. We don't want users passing in insane values
	* for zc->zc_nvlist_src_size, since we will need to allocate that much memory.
	* Defaults to 0=auto which is handled by platform code.
	*/
	unsigned long zfs_max_nvlist_src_size = 0;

	/*
	* When logging the output nvlist of an ioctl in the on-disk history, limit
	* the logged size to this many bytes. This must be less than DMU_MAX_ACCESS.
	* This applies primarily to zfs_ioc_channel_program().
	*/
	unsigned long zfs_history_output_max = 1024 * 1024;

	uint_t zfs_fsyncer_key;
	uint_t zfs_allow_log_key;

	/* DATA_TYPE_ANY is used when zkey_type can vary. */
	#define DATA_TYPE_ANY DATA_TYPE_UNKNOWN

	typedef struct zfs_ioc_vec {
	zfs_ioc_legacy_func_t *zvec_legacy_func;
	zfs_ioc_func_t *zvec_func;
	zfs_secpolicy_func_t *zvec_secpolicy;
	zfs_ioc_namecheck_t zvec_namecheck;
	boolean_t zvec_allow_log;
	zfs_ioc_poolcheck_t zvec_pool_check;
	boolean_t zvec_smush_outnvlist;
	const char *zvec_name;
	const zfs_ioc_key_t *zvec_nvl_keys;
	size_t zvec_nvl_key_count;
	} zfs_ioc_vec_t;

	/* This array is indexed by zfs_userquota_prop_t */
	static const char *userquota_perms[] = {
	ZFS_DELEG_PERM_USERUSED,
	ZFS_DELEG_PERM_USERQUOTA,
	ZFS_DELEG_PERM_GROUPUSED,
	ZFS_DELEG_PERM_GROUPQUOTA,
	ZFS_DELEG_PERM_USEROBJUSED,
	ZFS_DELEG_PERM_USEROBJQUOTA,
	ZFS_DELEG_PERM_GROUPOBJUSED,
	ZFS_DELEG_PERM_GROUPOBJQUOTA,
	ZFS_DELEG_PERM_PROJECTUSED,
	ZFS_DELEG_PERM_PROJECTQUOTA,
	ZFS_DELEG_PERM_PROJECTOBJUSED,
	ZFS_DELEG_PERM_PROJECTOBJQUOTA,
	};

	static int zfs_ioc_userspace_upgrade(zfs_cmd_t *zc);
	static int zfs_ioc_id_quota_upgrade(zfs_cmd_t *zc);
	static int zfs_check_settable(const char name, nvpair_t property,
	cred_t *cr);
	static int zfs_check_clearable(const char dataset, nvlist_t props,
	nvlist_t **errors);
	static int zfs_fill_zplprops_root(uint64_t, nvlist_t , nvlist_t ,
	boolean_t *);
	int zfs_set_prop_nvlist(const char , zprop_source_t, nvlist_t , nvlist_t *);
	static int get_nvlist(uint64_t nvl, uint64_t size, int iflag, nvlist_t **nvp);

	static void
	history_str_free(char *buf)
	{
	kmem_free(buf, HIS_MAX_RECORD_LEN);
	}

	static char *
	history_str_get(zfs_cmd_t *zc)
	{
	char *buf;

	if (zc->zc_history == 0)
	return (NULL);

	buf = kmem_alloc(HIS_MAX_RECORD_LEN, KM_SLEEP);
	if (copyinstr((void *)(uintptr_t)zc->zc_history,
	buf, HIS_MAX_RECORD_LEN, NULL) != 0) {
	history_str_free(buf);
	return (NULL);
	}

	buf[HIS_MAX_RECORD_LEN -1] = '\0';

	return (buf);
	}

	/*
	* Return non-zero if the spa version is less than requested version.
	*/
	static int
	zfs_earlier_version(const char *name, int version)
	{
	spa_t *spa;

	if (spa_open(name, &spa, FTAG) == 0) {
	if (spa_version(spa) < version) {
	spa_close(spa, FTAG);
	return (1);
	}
	spa_close(spa, FTAG);
	}
	return (0);
	}

	/*
	* Return TRUE if the ZPL version is less than requested version.
	*/
	static boolean_t
	zpl_earlier_version(const char *name, int version)
	{
	objset_t *os;
	boolean_t rc = B_TRUE;

	if (dmu_objset_hold(name, FTAG, &os) == 0) {
	uint64_t zplversion;

	if (dmu_objset_type(os) != DMU_OST_ZFS) {
	dmu_objset_rele(os, FTAG);
	return (B_TRUE);
	}
	/* XXX reading from non-owned objset */
	if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &zplversion) == 0)
	rc = zplversion < version;
	dmu_objset_rele(os, FTAG);
	}
	return (rc);
	}

	static void
	zfs_log_history(zfs_cmd_t *zc)
	{
	spa_t *spa;
	char *buf;

	if ((buf = history_str_get(zc)) == NULL)
	return;

	if (spa_open(zc->zc_name, &spa, FTAG) == 0) {
	if (spa_version(spa) >= SPA_VERSION_ZPOOL_HISTORY)
	(void) spa_history_log(spa, buf);
	spa_close(spa, FTAG);
	}
	history_str_free(buf);
	}

	/*
	* Policy for top-level read operations (list pools). Requires no privileges,
	* and can be used in the local zone, as there is no associated dataset.
	*/
	/* ARGSUSED */
	static int
	zfs_secpolicy_none(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (0);
	}

	/*
	* Policy for dataset read operations (list children, get statistics). Requires
	* no privileges, but must be visible in the local zone.
	*/
	/* ARGSUSED */
	static int
	zfs_secpolicy_read(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	if (INGLOBALZONE(curproc) \|\|
	zone_dataset_visible(zc->zc_name, NULL))
	return (0);

	return (SET_ERROR(ENOENT));
	}

	static int
	zfs_dozonecheck_impl(const char dataset, uint64_t zoned, cred_t cr)
	{
	int writable = 1;

	/*
	* The dataset must be visible by this zone -- check this first
	* so they don't see EPERM on something they shouldn't know about.
	*/
	if (!INGLOBALZONE(curproc) &&
	!zone_dataset_visible(dataset, &writable))
	return (SET_ERROR(ENOENT));

	if (INGLOBALZONE(curproc)) {
	/*
	* If the fs is zoned, only root can access it from the
	* global zone.
	*/
	if (secpolicy_zfs(cr) && zoned)
	return (SET_ERROR(EPERM));
	} else {
	/*
	* If we are in a local zone, the 'zoned' property must be set.
	*/
	if (!zoned)
	return (SET_ERROR(EPERM));

	/* must be writable by this zone */
	if (!writable)
	return (SET_ERROR(EPERM));
	}
	return (0);
	}

	static int
	zfs_dozonecheck(const char dataset, cred_t cr)
	{
	uint64_t zoned;

	if (dsl_prop_get_integer(dataset, zfs_prop_to_name(ZFS_PROP_ZONED),
	&zoned, NULL))
	return (SET_ERROR(ENOENT));

	return (zfs_dozonecheck_impl(dataset, zoned, cr));
	}

	static int
	zfs_dozonecheck_ds(const char dataset, dsl_dataset_t ds, cred_t *cr)
	{
	uint64_t zoned;

	if (dsl_prop_get_int_ds(ds, zfs_prop_to_name(ZFS_PROP_ZONED), &zoned))
	return (SET_ERROR(ENOENT));

	return (zfs_dozonecheck_impl(dataset, zoned, cr));
	}

	static int
	zfs_secpolicy_write_perms_ds(const char name, dsl_dataset_t ds,
	const char perm, cred_t cr)
	{
	int error;

	error = zfs_dozonecheck_ds(name, ds, cr);
	if (error == 0) {
	error = secpolicy_zfs(cr);
	if (error != 0)
	error = dsl_deleg_access_impl(ds, perm, cr);
	}
	return (error);
	}

	static int
	zfs_secpolicy_write_perms(const char name, const char perm, cred_t *cr)
	{
	int error;
	dsl_dataset_t *ds;
	dsl_pool_t *dp;

	/*
	* First do a quick check for root in the global zone, which
	* is allowed to do all write_perms. This ensures that zfs_ioc_*
	* will get to handle nonexistent datasets.
	*/
	if (INGLOBALZONE(curproc) && secpolicy_zfs(cr) == 0)
	return (0);

	error = dsl_pool_hold(name, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold(dp, name, FTAG, &ds);
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	error = zfs_secpolicy_write_perms_ds(name, ds, perm, cr);

	dsl_dataset_rele(ds, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	/*
	* Policy for setting the security label property.
	*
	* Returns 0 for success, non-zero for access and other errors.
	*/
	static int
	zfs_set_slabel_policy(const char name, const char strval, cred_t *cr)
	{
	#ifdef HAVE_MLSLABEL
	char ds_hexsl[MAXNAMELEN];
	bslabel_t ds_sl, new_sl;
	boolean_t new_default = FALSE;
	uint64_t zoned;
	int needed_priv = -1;
	int error;

	/* First get the existing dataset label. */
	error = dsl_prop_get(name, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
	1, sizeof (ds_hexsl), &ds_hexsl, NULL);
	if (error != 0)
	return (SET_ERROR(EPERM));

	if (strcasecmp(strval, ZFS_MLSLABEL_DEFAULT) == 0)
	new_default = TRUE;

	/* The label must be translatable */
	if (!new_default && (hexstr_to_label(strval, &new_sl) != 0))
	return (SET_ERROR(EINVAL));

	/*
	* In a non-global zone, disallow attempts to set a label that
	* doesn't match that of the zone; otherwise no other checks
	* are needed.
	*/
	if (!INGLOBALZONE(curproc)) {
	if (new_default \|\| !blequal(&new_sl, CR_SL(CRED())))
	return (SET_ERROR(EPERM));
	return (0);
	}

	/*
	* For global-zone datasets (i.e., those whose zoned property is
	* "off", verify that the specified new label is valid for the
	* global zone.
	*/
	if (dsl_prop_get_integer(name,
	zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL))
	return (SET_ERROR(EPERM));
	if (!zoned) {
	if (zfs_check_global_label(name, strval) != 0)
	return (SET_ERROR(EPERM));
	}

	/*
	* If the existing dataset label is nondefault, check if the
	* dataset is mounted (label cannot be changed while mounted).
	* Get the zfsvfs_t; if there isn't one, then the dataset isn't
	* mounted (or isn't a dataset, doesn't exist, ...).
	*/
	if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) != 0) {
	objset_t *os;
	static const char *setsl_tag = "setsl_tag";

	/*
	* Try to own the dataset; abort if there is any error,
	* (e.g., already mounted, in use, or other error).
	*/
	error = dmu_objset_own(name, DMU_OST_ZFS, B_TRUE, B_TRUE,
	setsl_tag, &os);
	if (error != 0)
	return (SET_ERROR(EPERM));

	dmu_objset_disown(os, B_TRUE, setsl_tag);

	if (new_default) {
	needed_priv = PRIV_FILE_DOWNGRADE_SL;
	goto out_check;
	}

	if (hexstr_to_label(strval, &new_sl) != 0)
	return (SET_ERROR(EPERM));

	if (blstrictdom(&ds_sl, &new_sl))
	needed_priv = PRIV_FILE_DOWNGRADE_SL;
	else if (blstrictdom(&new_sl, &ds_sl))
	needed_priv = PRIV_FILE_UPGRADE_SL;
	} else {
	/* dataset currently has a default label */
	if (!new_default)
	needed_priv = PRIV_FILE_UPGRADE_SL;
	}

	out_check:
	if (needed_priv != -1)
	return (PRIV_POLICY(cr, needed_priv, B_FALSE, EPERM, NULL));
	return (0);
	#else
	return (SET_ERROR(ENOTSUP));
	#endif /* HAVE_MLSLABEL */
	}

	static int
	zfs_secpolicy_setprop(const char dsname, zfs_prop_t prop, nvpair_t propval,
	cred_t *cr)
	{
	char *strval;

	/*
	* Check permissions for special properties.
	*/
	switch (prop) {
	default:
	break;
	case ZFS_PROP_ZONED:
	/*
	* Disallow setting of 'zoned' from within a local zone.
	*/
	if (!INGLOBALZONE(curproc))
	return (SET_ERROR(EPERM));
	break;

	case ZFS_PROP_QUOTA:
	case ZFS_PROP_FILESYSTEM_LIMIT:
	case ZFS_PROP_SNAPSHOT_LIMIT:
	if (!INGLOBALZONE(curproc)) {
	uint64_t zoned;
	char setpoint[ZFS_MAX_DATASET_NAME_LEN];
	/*
	* Unprivileged users are allowed to modify the
	* limit on things under (ie. contained by)
	* the thing they own.
	*/
	if (dsl_prop_get_integer(dsname,
	zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, setpoint))
	return (SET_ERROR(EPERM));
	if (!zoned \|\| strlen(dsname) <= strlen(setpoint))
	return (SET_ERROR(EPERM));
	}
	break;

	case ZFS_PROP_MLSLABEL:
	if (!is_system_labeled())
	return (SET_ERROR(EPERM));

	if (nvpair_value_string(propval, &strval) == 0) {
	int err;

	err = zfs_set_slabel_policy(dsname, strval, CRED());
	if (err != 0)
	return (err);
	}
	break;
	}

	return (zfs_secpolicy_write_perms(dsname, zfs_prop_to_name(prop), cr));
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_set_fsacl(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	int error;

	error = zfs_dozonecheck(zc->zc_name, cr);
	if (error != 0)
	return (error);

	/*
	* permission to set permissions will be evaluated later in
	* dsl_deleg_can_allow()
	*/
	return (0);
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_rollback(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_ROLLBACK, cr));
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_send(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	dsl_pool_t *dp;
	dsl_dataset_t *ds;
	const char *cp;
	int error;

	/*
	* Generate the current snapshot name from the given objsetid, then
	* use that name for the secpolicy/zone checks.
	*/
	cp = strchr(zc->zc_name, '@');
	if (cp == NULL)
	return (SET_ERROR(EINVAL));
	error = dsl_pool_hold(zc->zc_name, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold_obj(dp, zc->zc_sendobj, FTAG, &ds);
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	dsl_dataset_name(ds, zc->zc_name);

	error = zfs_secpolicy_write_perms_ds(zc->zc_name, ds,
	ZFS_DELEG_PERM_SEND, cr);
	dsl_dataset_rele(ds, FTAG);
	dsl_pool_rele(dp, FTAG);

	return (error);
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_send_new(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_SEND, cr));
	}

	static int
	zfs_secpolicy_share(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (SET_ERROR(ENOTSUP));
	}

	static int
	zfs_secpolicy_smb_acl(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (SET_ERROR(ENOTSUP));
	}

	static int
	zfs_get_parent(const char datasetname, char parent, int parentsize)
	{
	char *cp;

	/*
	* Remove the @bla or /bla from the end of the name to get the parent.
	*/
	(void) strncpy(parent, datasetname, parentsize);
	cp = strrchr(parent, '@');
	if (cp != NULL) {
	cp[0] = '\0';
	} else {
	cp = strrchr(parent, '/');
	if (cp == NULL)
	return (SET_ERROR(ENOENT));
	cp[0] = '\0';
	}

	return (0);
	}

	int
	zfs_secpolicy_destroy_perms(const char name, cred_t cr)
	{
	int error;

	if ((error = zfs_secpolicy_write_perms(name,
	ZFS_DELEG_PERM_MOUNT, cr)) != 0)
	return (error);

	return (zfs_secpolicy_write_perms(name, ZFS_DELEG_PERM_DESTROY, cr));
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_destroy(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (zfs_secpolicy_destroy_perms(zc->zc_name, cr));
	}

	/*
	* Destroying snapshots with delegated permissions requires
	* descendant mount and destroy permissions.
	*/
	/* ARGSUSED */
	static int
	zfs_secpolicy_destroy_snaps(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	nvlist_t *snaps;
	nvpair_t pair, nextpair;
	int error = 0;

	snaps = fnvlist_lookup_nvlist(innvl, "snaps");

	for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
	pair = nextpair) {
	nextpair = nvlist_next_nvpair(snaps, pair);
	error = zfs_secpolicy_destroy_perms(nvpair_name(pair), cr);
	if (error == ENOENT) {
	/*
	* Ignore any snapshots that don't exist (we consider
	* them "already destroyed"). Remove the name from the
	* nvl here in case the snapshot is created between
	* now and when we try to destroy it (in which case
	* we don't want to destroy it since we haven't
	* checked for permission).
	*/
	fnvlist_remove_nvpair(snaps, pair);
	error = 0;
	}
	if (error != 0)
	break;
	}

	return (error);
	}

	int
	zfs_secpolicy_rename_perms(const char from, const char to, cred_t *cr)
	{
	char parentname[ZFS_MAX_DATASET_NAME_LEN];
	int error;

	if ((error = zfs_secpolicy_write_perms(from,
	ZFS_DELEG_PERM_RENAME, cr)) != 0)
	return (error);

	if ((error = zfs_secpolicy_write_perms(from,
	ZFS_DELEG_PERM_MOUNT, cr)) != 0)
	return (error);

	if ((error = zfs_get_parent(to, parentname,
	sizeof (parentname))) != 0)
	return (error);

	if ((error = zfs_secpolicy_write_perms(parentname,
	ZFS_DELEG_PERM_CREATE, cr)) != 0)
	return (error);

	if ((error = zfs_secpolicy_write_perms(parentname,
	ZFS_DELEG_PERM_MOUNT, cr)) != 0)
	return (error);

	return (error);
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_rename(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (zfs_secpolicy_rename_perms(zc->zc_name, zc->zc_value, cr));
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_promote(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	dsl_pool_t *dp;
	dsl_dataset_t *clone;
	int error;

	error = zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_PROMOTE, cr);
	if (error != 0)
	return (error);

	error = dsl_pool_hold(zc->zc_name, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold(dp, zc->zc_name, FTAG, &clone);

	if (error == 0) {
	char parentname[ZFS_MAX_DATASET_NAME_LEN];
	dsl_dataset_t *origin = NULL;
	dsl_dir_t *dd;
	dd = clone->ds_dir;

	error = dsl_dataset_hold_obj(dd->dd_pool,
	dsl_dir_phys(dd)->dd_origin_obj, FTAG, &origin);
	if (error != 0) {
	dsl_dataset_rele(clone, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	error = zfs_secpolicy_write_perms_ds(zc->zc_name, clone,
	ZFS_DELEG_PERM_MOUNT, cr);

	dsl_dataset_name(origin, parentname);
	if (error == 0) {
	error = zfs_secpolicy_write_perms_ds(parentname, origin,
	ZFS_DELEG_PERM_PROMOTE, cr);
	}
	dsl_dataset_rele(clone, FTAG);
	dsl_dataset_rele(origin, FTAG);
	}
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_recv(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	int error;

	if ((error = zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_RECEIVE, cr)) != 0)
	return (error);

	if ((error = zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_MOUNT, cr)) != 0)
	return (error);

	return (zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_CREATE, cr));
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_recv_new(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (zfs_secpolicy_recv(zc, innvl, cr));
	}

	int
	zfs_secpolicy_snapshot_perms(const char name, cred_t cr)
	{
	return (zfs_secpolicy_write_perms(name,
	ZFS_DELEG_PERM_SNAPSHOT, cr));
	}

	/*
	* Check for permission to create each snapshot in the nvlist.
	*/
	/* ARGSUSED */
	static int
	zfs_secpolicy_snapshot(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	nvlist_t *snaps;
	int error = 0;
	nvpair_t *pair;

	snaps = fnvlist_lookup_nvlist(innvl, "snaps");

	for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
	pair = nvlist_next_nvpair(snaps, pair)) {
	char *name = nvpair_name(pair);
	char *atp = strchr(name, '@');

	if (atp == NULL) {
	error = SET_ERROR(EINVAL);
	break;
	}
	*atp = '\0';
	error = zfs_secpolicy_snapshot_perms(name, cr);
	*atp = '@';
	if (error != 0)
	break;
	}
	return (error);
	}

	/*
	* Check for permission to create each bookmark in the nvlist.
	*/
	/* ARGSUSED */
	static int
	zfs_secpolicy_bookmark(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	int error = 0;

	for (nvpair_t *pair = nvlist_next_nvpair(innvl, NULL);
	pair != NULL; pair = nvlist_next_nvpair(innvl, pair)) {
	char *name = nvpair_name(pair);
	char *hashp = strchr(name, '#');

	if (hashp == NULL) {
	error = SET_ERROR(EINVAL);
	break;
	}
	*hashp = '\0';
	error = zfs_secpolicy_write_perms(name,
	ZFS_DELEG_PERM_BOOKMARK, cr);
	*hashp = '#';
	if (error != 0)
	break;
	}
	return (error);
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_destroy_bookmarks(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	nvpair_t pair, nextpair;
	int error = 0;

	for (pair = nvlist_next_nvpair(innvl, NULL); pair != NULL;
	pair = nextpair) {
	char *name = nvpair_name(pair);
	char *hashp = strchr(name, '#');
	nextpair = nvlist_next_nvpair(innvl, pair);

	if (hashp == NULL) {
	error = SET_ERROR(EINVAL);
	break;
	}

	*hashp = '\0';
	error = zfs_secpolicy_write_perms(name,
	ZFS_DELEG_PERM_DESTROY, cr);
	*hashp = '#';
	if (error == ENOENT) {
	/*
	* Ignore any filesystems that don't exist (we consider
	* their bookmarks "already destroyed"). Remove
	* the name from the nvl here in case the filesystem
	* is created between now and when we try to destroy
	* the bookmark (in which case we don't want to
	* destroy it since we haven't checked for permission).
	*/
	fnvlist_remove_nvpair(innvl, pair);
	error = 0;
	}
	if (error != 0)
	break;
	}

	return (error);
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_log_history(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	/*
	* Even root must have a proper TSD so that we know what pool
	* to log to.
	*/
	if (tsd_get(zfs_allow_log_key) == NULL)
	return (SET_ERROR(EPERM));
	return (0);
	}

	static int
	zfs_secpolicy_create_clone(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	char parentname[ZFS_MAX_DATASET_NAME_LEN];
	int error;
	char *origin;

	if ((error = zfs_get_parent(zc->zc_name, parentname,
	sizeof (parentname))) != 0)
	return (error);

	if (nvlist_lookup_string(innvl, "origin", &origin) == 0 &&
	(error = zfs_secpolicy_write_perms(origin,
	ZFS_DELEG_PERM_CLONE, cr)) != 0)
	return (error);

	if ((error = zfs_secpolicy_write_perms(parentname,
	ZFS_DELEG_PERM_CREATE, cr)) != 0)
	return (error);

	return (zfs_secpolicy_write_perms(parentname,
	ZFS_DELEG_PERM_MOUNT, cr));
	}

	/*
	* Policy for pool operations - create/destroy pools, add vdevs, etc. Requires
	* SYS_CONFIG privilege, which is not available in a local zone.
	*/
	/* ARGSUSED */
	int
	zfs_secpolicy_config(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	if (secpolicy_sys_config(cr, B_FALSE) != 0)
	return (SET_ERROR(EPERM));

	return (0);
	}

	/*
	* Policy for object to name lookups.
	*/
	/* ARGSUSED */
	static int
	zfs_secpolicy_diff(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	int error;

	if ((error = secpolicy_sys_config(cr, B_FALSE)) == 0)
	return (0);

	error = zfs_secpolicy_write_perms(zc->zc_name, ZFS_DELEG_PERM_DIFF, cr);
	return (error);
	}

	/*
	* Policy for fault injection. Requires all privileges.
	*/
	/* ARGSUSED */
	static int
	zfs_secpolicy_inject(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (secpolicy_zinject(cr));
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_inherit_prop(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	zfs_prop_t prop = zfs_name_to_prop(zc->zc_value);

	if (prop == ZPROP_INVAL) {
	if (!zfs_prop_user(zc->zc_value))
	return (SET_ERROR(EINVAL));
	return (zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_USERPROP, cr));
	} else {
	return (zfs_secpolicy_setprop(zc->zc_name, prop,
	NULL, cr));
	}
	}

	static int
	zfs_secpolicy_userspace_one(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	int err = zfs_secpolicy_read(zc, innvl, cr);
	if (err)
	return (err);

	if (zc->zc_objset_type >= ZFS_NUM_USERQUOTA_PROPS)
	return (SET_ERROR(EINVAL));

	if (zc->zc_value[0] == 0) {
	/*
	* They are asking about a posix uid/gid. If it's
	* themself, allow it.
	*/
	if (zc->zc_objset_type == ZFS_PROP_USERUSED \|\|
	zc->zc_objset_type == ZFS_PROP_USERQUOTA \|\|
	zc->zc_objset_type == ZFS_PROP_USEROBJUSED \|\|
	zc->zc_objset_type == ZFS_PROP_USEROBJQUOTA) {
	if (zc->zc_guid == crgetuid(cr))
	return (0);
	} else if (zc->zc_objset_type == ZFS_PROP_GROUPUSED \|\|
	zc->zc_objset_type == ZFS_PROP_GROUPQUOTA \|\|
	zc->zc_objset_type == ZFS_PROP_GROUPOBJUSED \|\|
	zc->zc_objset_type == ZFS_PROP_GROUPOBJQUOTA) {
	if (groupmember(zc->zc_guid, cr))
	return (0);
	}
	/* else is for project quota/used */
	}

	return (zfs_secpolicy_write_perms(zc->zc_name,
	userquota_perms[zc->zc_objset_type], cr));
	}

	static int
	zfs_secpolicy_userspace_many(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	int err = zfs_secpolicy_read(zc, innvl, cr);
	if (err)
	return (err);

	if (zc->zc_objset_type >= ZFS_NUM_USERQUOTA_PROPS)
	return (SET_ERROR(EINVAL));

	return (zfs_secpolicy_write_perms(zc->zc_name,
	userquota_perms[zc->zc_objset_type], cr));
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_userspace_upgrade(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (zfs_secpolicy_setprop(zc->zc_name, ZFS_PROP_VERSION,
	NULL, cr));
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_hold(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	nvpair_t *pair;
	nvlist_t *holds;
	int error;

	holds = fnvlist_lookup_nvlist(innvl, "holds");

	for (pair = nvlist_next_nvpair(holds, NULL); pair != NULL;
	pair = nvlist_next_nvpair(holds, pair)) {
	char fsname[ZFS_MAX_DATASET_NAME_LEN];
	error = dmu_fsname(nvpair_name(pair), fsname);
	if (error != 0)
	return (error);
	error = zfs_secpolicy_write_perms(fsname,
	ZFS_DELEG_PERM_HOLD, cr);
	if (error != 0)
	return (error);
	}
	return (0);
	}

	/* ARGSUSED */
	static int
	zfs_secpolicy_release(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	nvpair_t *pair;
	int error;

	for (pair = nvlist_next_nvpair(innvl, NULL); pair != NULL;
	pair = nvlist_next_nvpair(innvl, pair)) {
	char fsname[ZFS_MAX_DATASET_NAME_LEN];
	error = dmu_fsname(nvpair_name(pair), fsname);
	if (error != 0)
	return (error);
	error = zfs_secpolicy_write_perms(fsname,
	ZFS_DELEG_PERM_RELEASE, cr);
	if (error != 0)
	return (error);
	}
	return (0);
	}

	/*
	* Policy for allowing temporary snapshots to be taken or released
	*/
	static int
	zfs_secpolicy_tmp_snapshot(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	/*
	* A temporary snapshot is the same as a snapshot,
	* hold, destroy and release all rolled into one.
	* Delegated diff alone is sufficient that we allow this.
	*/
	int error;

	if ((error = zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_DIFF, cr)) == 0)
	return (0);

	error = zfs_secpolicy_snapshot_perms(zc->zc_name, cr);

	if (innvl != NULL) {
	if (error == 0)
	error = zfs_secpolicy_hold(zc, innvl, cr);
	if (error == 0)
	error = zfs_secpolicy_release(zc, innvl, cr);
	if (error == 0)
	error = zfs_secpolicy_destroy(zc, innvl, cr);
	}
	return (error);
	}

	static int
	zfs_secpolicy_load_key(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_LOAD_KEY, cr));
	}

	static int
	zfs_secpolicy_change_key(zfs_cmd_t zc, nvlist_t innvl, cred_t *cr)
	{
	return (zfs_secpolicy_write_perms(zc->zc_name,
	ZFS_DELEG_PERM_CHANGE_KEY, cr));
	}

	/*
	* Returns the nvlist as specified by the user in the zfs_cmd_t.
	*/
	static int
	get_nvlist(uint64_t nvl, uint64_t size, int iflag, nvlist_t **nvp)
	{
	char *packed;
	int error;
	nvlist_t *list = NULL;

	/*
	* Read in and unpack the user-supplied nvlist.
	*/
	if (size == 0)
	return (SET_ERROR(EINVAL));

	packed = vmem_alloc(size, KM_SLEEP);

	if ((error = ddi_copyin((void *)(uintptr_t)nvl, packed, size,
	iflag)) != 0) {
	vmem_free(packed, size);
	return (SET_ERROR(EFAULT));
	}

	if ((error = nvlist_unpack(packed, size, &list, 0)) != 0) {
	vmem_free(packed, size);
	return (error);
	}

	vmem_free(packed, size);

	*nvp = list;
	return (0);
	}

	/*
	* Reduce the size of this nvlist until it can be serialized in 'max' bytes.
	* Entries will be removed from the end of the nvlist, and one int32 entry
	* named "N_MORE_ERRORS" will be added indicating how many entries were
	* removed.
	*/
	static int
	nvlist_smush(nvlist_t *errors, size_t max)
	{
	size_t size;

	size = fnvlist_size(errors);

	if (size > max) {
	nvpair_t *more_errors;
	int n = 0;

	if (max < 1024)
	return (SET_ERROR(ENOMEM));

	fnvlist_add_int32(errors, ZPROP_N_MORE_ERRORS, 0);
	more_errors = nvlist_prev_nvpair(errors, NULL);

	do {
	nvpair_t *pair = nvlist_prev_nvpair(errors,
	more_errors);
	fnvlist_remove_nvpair(errors, pair);
	n++;
	size = fnvlist_size(errors);
	} while (size > max);

	fnvlist_remove_nvpair(errors, more_errors);
	fnvlist_add_int32(errors, ZPROP_N_MORE_ERRORS, n);
	ASSERT3U(fnvlist_size(errors), <=, max);
	}

	return (0);
	}

	static int
	put_nvlist(zfs_cmd_t zc, nvlist_t nvl)
	{
	char *packed = NULL;
	int error = 0;
	size_t size;

	size = fnvlist_size(nvl);

	if (size > zc->zc_nvlist_dst_size) {
	error = SET_ERROR(ENOMEM);
	} else {
	packed = fnvlist_pack(nvl, &size);
	if (ddi_copyout(packed, (void *)(uintptr_t)zc->zc_nvlist_dst,
	size, zc->zc_iflags) != 0)
	error = SET_ERROR(EFAULT);
	fnvlist_pack_free(packed, size);
	}

	zc->zc_nvlist_dst_size = size;
	zc->zc_nvlist_dst_filled = B_TRUE;
	return (error);
	}

	int
	getzfsvfs_impl(objset_t os, zfsvfs_t *zfvp)
	{
	int error = 0;
	if (dmu_objset_type(os) != DMU_OST_ZFS) {
	return (SET_ERROR(EINVAL));
	}

	mutex_enter(&os->os_user_ptr_lock);
	*zfvp = dmu_objset_get_user(os);
	/* bump s_active only when non-zero to prevent umount race */
	error = zfs_vfs_ref(zfvp);
	mutex_exit(&os->os_user_ptr_lock);
	return (error);
	}

	int
	getzfsvfs(const char dsname, zfsvfs_t *zfvp)
	{
	objset_t *os;
	int error;

	error = dmu_objset_hold(dsname, FTAG, &os);
	if (error != 0)
	return (error);

	error = getzfsvfs_impl(os, zfvp);
	dmu_objset_rele(os, FTAG);
	return (error);
	}

	/*
	* Find a zfsvfs_t for a mounted filesystem, or create our own, in which
	* case its z_sb will be NULL, and it will be opened as the owner.
	* If 'writer' is set, the z_teardown_lock will be held for RW_WRITER,
	* which prevents all inode ops from running.
	*/
	static int
	zfsvfs_hold(const char name, void tag, zfsvfs_t **zfvp, boolean_t writer)
	{
	int error = 0;

	if (getzfsvfs(name, zfvp) != 0)
	error = zfsvfs_create(name, B_FALSE, zfvp);
	if (error == 0) {
	if (writer)
	ZFS_TEARDOWN_ENTER_WRITE(*zfvp, tag);
	else
	ZFS_TEARDOWN_ENTER_READ(*zfvp, tag);
	if ((*zfvp)->z_unmounted) {
	/*
	* XXX we could probably try again, since the unmounting
	* thread should be just about to disassociate the
	* objset from the zfsvfs.
	*/
	ZFS_TEARDOWN_EXIT(*zfvp, tag);
	return (SET_ERROR(EBUSY));
	}
	}
	return (error);
	}

	static void
	zfsvfs_rele(zfsvfs_t zfsvfs, void tag)
	{
	ZFS_TEARDOWN_EXIT(zfsvfs, tag);

	if (zfs_vfs_held(zfsvfs)) {
	zfs_vfs_rele(zfsvfs);
	} else {
	dmu_objset_disown(zfsvfs->z_os, B_TRUE, zfsvfs);
	zfsvfs_free(zfsvfs);
	}
	}

	static int
	zfs_ioc_pool_create(zfs_cmd_t *zc)
	{
	int error;
	nvlist_t config, props = NULL;
	nvlist_t *rootprops = NULL;
	nvlist_t *zplprops = NULL;
	dsl_crypto_params_t *dcp = NULL;
	const char *spa_name = zc->zc_name;
	boolean_t unload_wkey = B_TRUE;

	if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
	zc->zc_iflags, &config)))
	return (error);

	if (zc->zc_nvlist_src_size != 0 && (error =
	get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &props))) {
	nvlist_free(config);
	return (error);
	}

	if (props) {
	nvlist_t *nvl = NULL;
	nvlist_t *hidden_args = NULL;
	uint64_t version = SPA_VERSION;
	char *tname;

	(void) nvlist_lookup_uint64(props,
	zpool_prop_to_name(ZPOOL_PROP_VERSION), &version);
	if (!SPA_VERSION_IS_SUPPORTED(version)) {
	error = SET_ERROR(EINVAL);
	goto pool_props_bad;
	}
	(void) nvlist_lookup_nvlist(props, ZPOOL_ROOTFS_PROPS, &nvl);
	if (nvl) {
	error = nvlist_dup(nvl, &rootprops, KM_SLEEP);
	if (error != 0)
	goto pool_props_bad;
	(void) nvlist_remove_all(props, ZPOOL_ROOTFS_PROPS);
	}

	(void) nvlist_lookup_nvlist(props, ZPOOL_HIDDEN_ARGS,
	&hidden_args);
	error = dsl_crypto_params_create_nvlist(DCP_CMD_NONE,
	rootprops, hidden_args, &dcp);
	if (error != 0)
	goto pool_props_bad;
	(void) nvlist_remove_all(props, ZPOOL_HIDDEN_ARGS);

	VERIFY(nvlist_alloc(&zplprops, NV_UNIQUE_NAME, KM_SLEEP) == 0);
	error = zfs_fill_zplprops_root(version, rootprops,
	zplprops, NULL);
	if (error != 0)
	goto pool_props_bad;

	if (nvlist_lookup_string(props,
	zpool_prop_to_name(ZPOOL_PROP_TNAME), &tname) == 0)
	spa_name = tname;
	}

	error = spa_create(zc->zc_name, config, props, zplprops, dcp);

	/*
	* Set the remaining root properties
	*/
	if (!error && (error = zfs_set_prop_nvlist(spa_name,
	ZPROP_SRC_LOCAL, rootprops, NULL)) != 0) {
	(void) spa_destroy(spa_name);
	unload_wkey = B_FALSE; /* spa_destroy() unloads wrapping keys */
	}

	pool_props_bad:
	nvlist_free(rootprops);
	nvlist_free(zplprops);
	nvlist_free(config);
	nvlist_free(props);
	dsl_crypto_params_free(dcp, unload_wkey && !!error);

	return (error);
	}

	static int
	zfs_ioc_pool_destroy(zfs_cmd_t *zc)
	{
	int error;
	zfs_log_history(zc);
	error = spa_destroy(zc->zc_name);

	return (error);
	}

	static int
	zfs_ioc_pool_import(zfs_cmd_t *zc)
	{
	nvlist_t config, props = NULL;
	uint64_t guid;
	int error;

	if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
	zc->zc_iflags, &config)) != 0)
	return (error);

	if (zc->zc_nvlist_src_size != 0 && (error =
	get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &props))) {
	nvlist_free(config);
	return (error);
	}

	if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &guid) != 0 \|\|
	guid != zc->zc_guid)
	error = SET_ERROR(EINVAL);
	else
	error = spa_import(zc->zc_name, config, props, zc->zc_cookie);

	if (zc->zc_nvlist_dst != 0) {
	int err;

	if ((err = put_nvlist(zc, config)) != 0)
	error = err;
	}

	nvlist_free(config);
	nvlist_free(props);

	return (error);
	}

	static int
	zfs_ioc_pool_export(zfs_cmd_t *zc)
	{
	int error;
	boolean_t force = (boolean_t)zc->zc_cookie;
	boolean_t hardforce = (boolean_t)zc->zc_guid;

	zfs_log_history(zc);
	error = spa_export(zc->zc_name, NULL, force, hardforce);

	return (error);
	}

	static int
	zfs_ioc_pool_configs(zfs_cmd_t *zc)
	{
	nvlist_t *configs;
	int error;

	if ((configs = spa_all_configs(&zc->zc_cookie)) == NULL)
	return (SET_ERROR(EEXIST));

	error = put_nvlist(zc, configs);

	nvlist_free(configs);

	return (error);
	}

	/*
	* inputs:
	* zc_name name of the pool
	*
	* outputs:
	* zc_cookie real errno
	* zc_nvlist_dst config nvlist
	* zc_nvlist_dst_size size of config nvlist
	*/
	static int
	zfs_ioc_pool_stats(zfs_cmd_t *zc)
	{
	nvlist_t *config;
	int error;
	int ret = 0;

	error = spa_get_stats(zc->zc_name, &config, zc->zc_value,
	sizeof (zc->zc_value));

	if (config != NULL) {
	ret = put_nvlist(zc, config);
	nvlist_free(config);

	/*
	* The config may be present even if 'error' is non-zero.
	* In this case we return success, and preserve the real errno
	* in 'zc_cookie'.
	*/
	zc->zc_cookie = error;
	} else {
	ret = error;
	}

	return (ret);
	}

	/*
	* Try to import the given pool, returning pool stats as appropriate so that
	* user land knows which devices are available and overall pool health.
	*/
	static int
	zfs_ioc_pool_tryimport(zfs_cmd_t *zc)
	{
	nvlist_t tryconfig, config = NULL;
	int error;

	if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
	zc->zc_iflags, &tryconfig)) != 0)
	return (error);

	config = spa_tryimport(tryconfig);

	nvlist_free(tryconfig);

	if (config == NULL)
	return (SET_ERROR(EINVAL));

	error = put_nvlist(zc, config);
	nvlist_free(config);

	return (error);
	}

	/*
	* inputs:
	* zc_name name of the pool
	* zc_cookie scan func (pool_scan_func_t)
	* zc_flags scrub pause/resume flag (pool_scrub_cmd_t)
	*/
	static int
	zfs_ioc_pool_scan(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;

	if (zc->zc_flags >= POOL_SCRUB_FLAGS_END)
	return (SET_ERROR(EINVAL));

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
	return (error);

	if (zc->zc_flags == POOL_SCRUB_PAUSE)
	error = spa_scrub_pause_resume(spa, POOL_SCRUB_PAUSE);
	else if (zc->zc_cookie == POOL_SCAN_NONE)
	error = spa_scan_stop(spa);
	else
	error = spa_scan(spa, zc->zc_cookie);

	spa_close(spa, FTAG);

	return (error);
	}

	static int
	zfs_ioc_pool_freeze(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;

	error = spa_open(zc->zc_name, &spa, FTAG);
	if (error == 0) {
	spa_freeze(spa);
	spa_close(spa, FTAG);
	}
	return (error);
	}

	static int
	zfs_ioc_pool_upgrade(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
	return (error);

	if (zc->zc_cookie < spa_version(spa) \|\|
	!SPA_VERSION_IS_SUPPORTED(zc->zc_cookie)) {
	spa_close(spa, FTAG);
	return (SET_ERROR(EINVAL));
	}

	spa_upgrade(spa, zc->zc_cookie);
	spa_close(spa, FTAG);

	return (error);
	}

	static int
	zfs_ioc_pool_get_history(zfs_cmd_t *zc)
	{
	spa_t *spa;
	char *hist_buf;
	uint64_t size;
	int error;

	if ((size = zc->zc_history_len) == 0)
	return (SET_ERROR(EINVAL));

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
	return (error);

	if (spa_version(spa) < SPA_VERSION_ZPOOL_HISTORY) {
	spa_close(spa, FTAG);
	return (SET_ERROR(ENOTSUP));
	}

	hist_buf = vmem_alloc(size, KM_SLEEP);
	if ((error = spa_history_get(spa, &zc->zc_history_offset,
	&zc->zc_history_len, hist_buf)) == 0) {
	error = ddi_copyout(hist_buf,
	(void *)(uintptr_t)zc->zc_history,
	zc->zc_history_len, zc->zc_iflags);
	}

	spa_close(spa, FTAG);
	vmem_free(hist_buf, size);
	return (error);
	}

	static int
	zfs_ioc_pool_reguid(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;

	error = spa_open(zc->zc_name, &spa, FTAG);
	if (error == 0) {
	error = spa_change_guid(spa);
	spa_close(spa, FTAG);
	}
	return (error);
	}

	static int
	zfs_ioc_dsobj_to_dsname(zfs_cmd_t *zc)
	{
	return (dsl_dsobj_to_dsname(zc->zc_name, zc->zc_obj, zc->zc_value));
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_obj object to find
	*
	* outputs:
	* zc_value name of object
	*/
	static int
	zfs_ioc_obj_to_path(zfs_cmd_t *zc)
	{
	objset_t *os;
	int error;

	/* XXX reading from objset not owned */
	if ((error = dmu_objset_hold_flags(zc->zc_name, B_TRUE,
	FTAG, &os)) != 0)
	return (error);
	if (dmu_objset_type(os) != DMU_OST_ZFS) {
	dmu_objset_rele_flags(os, B_TRUE, FTAG);
	return (SET_ERROR(EINVAL));
	}
	error = zfs_obj_to_path(os, zc->zc_obj, zc->zc_value,
	sizeof (zc->zc_value));
	dmu_objset_rele_flags(os, B_TRUE, FTAG);

	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_obj object to find
	*
	* outputs:
	* zc_stat stats on object
	* zc_value path to object
	*/
	static int
	zfs_ioc_obj_to_stats(zfs_cmd_t *zc)
	{
	objset_t *os;
	int error;

	/* XXX reading from objset not owned */
	if ((error = dmu_objset_hold_flags(zc->zc_name, B_TRUE,
	FTAG, &os)) != 0)
	return (error);
	if (dmu_objset_type(os) != DMU_OST_ZFS) {
	dmu_objset_rele_flags(os, B_TRUE, FTAG);
	return (SET_ERROR(EINVAL));
	}
	error = zfs_obj_to_stats(os, zc->zc_obj, &zc->zc_stat, zc->zc_value,
	sizeof (zc->zc_value));
	dmu_objset_rele_flags(os, B_TRUE, FTAG);

	return (error);
	}

	static int
	zfs_ioc_vdev_add(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;
	nvlist_t *config;

	error = spa_open(zc->zc_name, &spa, FTAG);
	if (error != 0)
	return (error);

	error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
	zc->zc_iflags, &config);
	if (error == 0) {
	error = spa_vdev_add(spa, config);
	nvlist_free(config);
	}
	spa_close(spa, FTAG);
	return (error);
	}

	/*
	* inputs:
	* zc_name name of the pool
	* zc_guid guid of vdev to remove
	* zc_cookie cancel removal
	*/
	static int
	zfs_ioc_vdev_remove(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;

	error = spa_open(zc->zc_name, &spa, FTAG);
	if (error != 0)
	return (error);
	if (zc->zc_cookie != 0) {
	error = spa_vdev_remove_cancel(spa);
	} else {
	error = spa_vdev_remove(spa, zc->zc_guid, B_FALSE);
	}
	spa_close(spa, FTAG);
	return (error);
	}

	static int
	zfs_ioc_vdev_set_state(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;
	vdev_state_t newstate = VDEV_STATE_UNKNOWN;

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
	return (error);
	switch (zc->zc_cookie) {
	case VDEV_STATE_ONLINE:
	error = vdev_online(spa, zc->zc_guid, zc->zc_obj, &newstate);
	break;

	case VDEV_STATE_OFFLINE:
	error = vdev_offline(spa, zc->zc_guid, zc->zc_obj);
	break;

	case VDEV_STATE_FAULTED:
	if (zc->zc_obj != VDEV_AUX_ERR_EXCEEDED &&
	zc->zc_obj != VDEV_AUX_EXTERNAL &&
	zc->zc_obj != VDEV_AUX_EXTERNAL_PERSIST)
	zc->zc_obj = VDEV_AUX_ERR_EXCEEDED;

	error = vdev_fault(spa, zc->zc_guid, zc->zc_obj);
	break;

	case VDEV_STATE_DEGRADED:
	if (zc->zc_obj != VDEV_AUX_ERR_EXCEEDED &&
	zc->zc_obj != VDEV_AUX_EXTERNAL)
	zc->zc_obj = VDEV_AUX_ERR_EXCEEDED;

	error = vdev_degrade(spa, zc->zc_guid, zc->zc_obj);
	break;

	default:
	error = SET_ERROR(EINVAL);
	}
	zc->zc_cookie = newstate;
	spa_close(spa, FTAG);
	return (error);
	}

	static int
	zfs_ioc_vdev_attach(zfs_cmd_t *zc)
	{
	spa_t *spa;
	nvlist_t *config;
	int replacing = zc->zc_cookie;
	int rebuild = zc->zc_simple;
	int error;

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
	return (error);

	if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
	zc->zc_iflags, &config)) == 0) {
	error = spa_vdev_attach(spa, zc->zc_guid, config, replacing,
	rebuild);
	nvlist_free(config);
	}

	spa_close(spa, FTAG);
	return (error);
	}

	static int
	zfs_ioc_vdev_detach(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
	return (error);

	error = spa_vdev_detach(spa, zc->zc_guid, 0, B_FALSE);

	spa_close(spa, FTAG);
	return (error);
	}

	static int
	zfs_ioc_vdev_split(zfs_cmd_t *zc)
	{
	spa_t *spa;
	nvlist_t config, props = NULL;
	int error;
	boolean_t exp = !!(zc->zc_cookie & ZPOOL_EXPORT_AFTER_SPLIT);

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
	return (error);

	if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
	zc->zc_iflags, &config))) {
	spa_close(spa, FTAG);
	return (error);
	}

	if (zc->zc_nvlist_src_size != 0 && (error =
	get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &props))) {
	spa_close(spa, FTAG);
	nvlist_free(config);
	return (error);
	}

	error = spa_vdev_split_mirror(spa, zc->zc_string, config, props, exp);

	spa_close(spa, FTAG);

	nvlist_free(config);
	nvlist_free(props);

	return (error);
	}

	static int
	zfs_ioc_vdev_setpath(zfs_cmd_t *zc)
	{
	spa_t *spa;
	const char *path = zc->zc_value;
	uint64_t guid = zc->zc_guid;
	int error;

	error = spa_open(zc->zc_name, &spa, FTAG);
	if (error != 0)
	return (error);

	error = spa_vdev_setpath(spa, guid, path);
	spa_close(spa, FTAG);
	return (error);
	}

	static int
	zfs_ioc_vdev_setfru(zfs_cmd_t *zc)
	{
	spa_t *spa;
	const char *fru = zc->zc_value;
	uint64_t guid = zc->zc_guid;
	int error;

	error = spa_open(zc->zc_name, &spa, FTAG);
	if (error != 0)
	return (error);

	error = spa_vdev_setfru(spa, guid, fru);
	spa_close(spa, FTAG);
	return (error);
	}

	static int
	zfs_ioc_objset_stats_impl(zfs_cmd_t zc, objset_t os)
	{
	int error = 0;
	nvlist_t *nv;

	dmu_objset_fast_stat(os, &zc->zc_objset_stats);

	if (zc->zc_nvlist_dst != 0 &&
	(error = dsl_prop_get_all(os, &nv)) == 0) {
	dmu_objset_stats(os, nv);
	/*
	* NB: zvol_get_stats() will read the objset contents,
	* which we aren't supposed to do with a
	* DS_MODE_USER hold, because it could be
	* inconsistent. So this is a bit of a workaround...
	* XXX reading without owning
	*/
	if (!zc->zc_objset_stats.dds_inconsistent &&
	dmu_objset_type(os) == DMU_OST_ZVOL) {
	error = zvol_get_stats(os, nv);
	if (error == EIO) {
	nvlist_free(nv);
	return (error);
	}
	VERIFY0(error);
	}
	if (error == 0)
	error = put_nvlist(zc, nv);
	nvlist_free(nv);
	}

	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_nvlist_dst_size size of buffer for property nvlist
	*
	* outputs:
	* zc_objset_stats stats
	* zc_nvlist_dst property nvlist
	* zc_nvlist_dst_size size of property nvlist
	*/
	static int
	zfs_ioc_objset_stats(zfs_cmd_t *zc)
	{
	objset_t *os;
	int error;

	error = dmu_objset_hold(zc->zc_name, FTAG, &os);
	if (error == 0) {
	error = zfs_ioc_objset_stats_impl(zc, os);
	dmu_objset_rele(os, FTAG);
	}

	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_nvlist_dst_size size of buffer for property nvlist
	*
	* outputs:
	* zc_nvlist_dst received property nvlist
	* zc_nvlist_dst_size size of received property nvlist
	*
	* Gets received properties (distinct from local properties on or after
	* SPA_VERSION_RECVD_PROPS) for callers who want to differentiate received from
	* local property values.
	*/
	static int
	zfs_ioc_objset_recvd_props(zfs_cmd_t *zc)
	{
	int error = 0;
	nvlist_t *nv;

	/*
	* Without this check, we would return local property values if the
	* caller has not already received properties on or after
	* SPA_VERSION_RECVD_PROPS.
	*/
	if (!dsl_prop_get_hasrecvd(zc->zc_name))
	return (SET_ERROR(ENOTSUP));

	if (zc->zc_nvlist_dst != 0 &&
	(error = dsl_prop_get_received(zc->zc_name, &nv)) == 0) {
	error = put_nvlist(zc, nv);
	nvlist_free(nv);
	}

	return (error);
	}

	static int
	nvl_add_zplprop(objset_t os, nvlist_t props, zfs_prop_t prop)
	{
	uint64_t value;
	int error;

	/*
	* zfs_get_zplprop() will either find a value or give us
	* the default value (if there is one).
	*/
	if ((error = zfs_get_zplprop(os, prop, &value)) != 0)
	return (error);
	VERIFY(nvlist_add_uint64(props, zfs_prop_to_name(prop), value) == 0);
	return (0);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_nvlist_dst_size size of buffer for zpl property nvlist
	*
	* outputs:
	* zc_nvlist_dst zpl property nvlist
	* zc_nvlist_dst_size size of zpl property nvlist
	*/
	static int
	zfs_ioc_objset_zplprops(zfs_cmd_t *zc)
	{
	objset_t *os;
	int err;

	/* XXX reading without owning */
	if ((err = dmu_objset_hold(zc->zc_name, FTAG, &os)))
	return (err);

	dmu_objset_fast_stat(os, &zc->zc_objset_stats);

	/*
	* NB: nvl_add_zplprop() will read the objset contents,
	* which we aren't supposed to do with a DS_MODE_USER
	* hold, because it could be inconsistent.
	*/
	if (zc->zc_nvlist_dst != 0 &&
	!zc->zc_objset_stats.dds_inconsistent &&
	dmu_objset_type(os) == DMU_OST_ZFS) {
	nvlist_t *nv;

	VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
	if ((err = nvl_add_zplprop(os, nv, ZFS_PROP_VERSION)) == 0 &&
	(err = nvl_add_zplprop(os, nv, ZFS_PROP_NORMALIZE)) == 0 &&
	(err = nvl_add_zplprop(os, nv, ZFS_PROP_UTF8ONLY)) == 0 &&
	(err = nvl_add_zplprop(os, nv, ZFS_PROP_CASE)) == 0)
	err = put_nvlist(zc, nv);
	nvlist_free(nv);
	} else {
	err = SET_ERROR(ENOENT);
	}
	dmu_objset_rele(os, FTAG);
	return (err);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_cookie zap cursor
	* zc_nvlist_dst_size size of buffer for property nvlist
	*
	* outputs:
	* zc_name name of next filesystem
	* zc_cookie zap cursor
	* zc_objset_stats stats
	* zc_nvlist_dst property nvlist
	* zc_nvlist_dst_size size of property nvlist
	*/
	static int
	zfs_ioc_dataset_list_next(zfs_cmd_t *zc)
	{
	objset_t *os;
	int error;
	char *p;
	size_t orig_len = strlen(zc->zc_name);

	top:
	if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os))) {
	if (error == ENOENT)
	error = SET_ERROR(ESRCH);
	return (error);
	}

	p = strrchr(zc->zc_name, '/');
	if (p == NULL \|\| p[1] != '\0')
	(void) strlcat(zc->zc_name, "/", sizeof (zc->zc_name));
	p = zc->zc_name + strlen(zc->zc_name);

	do {
	error = dmu_dir_list_next(os,
	sizeof (zc->zc_name) - (p - zc->zc_name), p,
	NULL, &zc->zc_cookie);
	if (error == ENOENT)
	error = SET_ERROR(ESRCH);
	} while (error == 0 && zfs_dataset_name_hidden(zc->zc_name));
	dmu_objset_rele(os, FTAG);

	/*
	* If it's an internal dataset (ie. with a '$' in its name),
	* don't try to get stats for it, otherwise we'll return ENOENT.
	*/
	if (error == 0 && strchr(zc->zc_name, '$') == NULL) {
	error = zfs_ioc_objset_stats(zc); /* fill in the stats */
	if (error == ENOENT) {
	/* We lost a race with destroy, get the next one. */
	zc->zc_name[orig_len] = '\0';
	goto top;
	}
	}
	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_cookie zap cursor
	* zc_nvlist_src iteration range nvlist
	* zc_nvlist_src_size size of iteration range nvlist
	*
	* outputs:
	* zc_name name of next snapshot
	* zc_objset_stats stats
	* zc_nvlist_dst property nvlist
	* zc_nvlist_dst_size size of property nvlist
	*/
	static int
	zfs_ioc_snapshot_list_next(zfs_cmd_t *zc)
	{
	int error;
	objset_t os, ossnap;
	dsl_dataset_t *ds;
	uint64_t min_txg = 0, max_txg = 0;

	if (zc->zc_nvlist_src_size != 0) {
	nvlist_t *props = NULL;
	error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &props);
	if (error != 0)
	return (error);
	(void) nvlist_lookup_uint64(props, SNAP_ITER_MIN_TXG,
	&min_txg);
	(void) nvlist_lookup_uint64(props, SNAP_ITER_MAX_TXG,
	&max_txg);
	nvlist_free(props);
	}

	error = dmu_objset_hold(zc->zc_name, FTAG, &os);
	if (error != 0) {
	return (error == ENOENT ? SET_ERROR(ESRCH) : error);
	}

	/*
	* A dataset name of maximum length cannot have any snapshots,
	* so exit immediately.
	*/
	if (strlcat(zc->zc_name, "@", sizeof (zc->zc_name)) >=
	ZFS_MAX_DATASET_NAME_LEN) {
	dmu_objset_rele(os, FTAG);
	return (SET_ERROR(ESRCH));
	}

	while (error == 0) {
	if (issig(JUSTLOOKING) && issig(FORREAL)) {
	error = SET_ERROR(EINTR);
	break;
	}

	error = dmu_snapshot_list_next(os,
	sizeof (zc->zc_name) - strlen(zc->zc_name),
	zc->zc_name + strlen(zc->zc_name), &zc->zc_obj,
	&zc->zc_cookie, NULL);
	if (error == ENOENT) {
	error = SET_ERROR(ESRCH);
	break;
	} else if (error != 0) {
	break;
	}

	error = dsl_dataset_hold_obj(dmu_objset_pool(os), zc->zc_obj,
	FTAG, &ds);
	if (error != 0)
	break;

	if ((min_txg != 0 && dsl_get_creationtxg(ds) < min_txg) \|\|
	(max_txg != 0 && dsl_get_creationtxg(ds) > max_txg)) {
	dsl_dataset_rele(ds, FTAG);
	/* undo snapshot name append */
	*(strchr(zc->zc_name, '@') + 1) = '\0';
	/* skip snapshot */
	continue;
	}

	if (zc->zc_simple) {
	dsl_dataset_rele(ds, FTAG);
	break;
	}

	if ((error = dmu_objset_from_ds(ds, &ossnap)) != 0) {
	dsl_dataset_rele(ds, FTAG);
	break;
	}
	if ((error = zfs_ioc_objset_stats_impl(zc, ossnap)) != 0) {
	dsl_dataset_rele(ds, FTAG);
	break;
	}
	dsl_dataset_rele(ds, FTAG);
	break;
	}

	dmu_objset_rele(os, FTAG);
	/* if we failed, undo the @ that we tacked on to zc_name */
	if (error != 0)
	*strchr(zc->zc_name, '@') = '\0';
	return (error);
	}

	static int
	zfs_prop_set_userquota(const char dsname, nvpair_t pair)
	{
	const char *propname = nvpair_name(pair);
	uint64_t *valary;
	unsigned int vallen;
	const char dash, domain;
	zfs_userquota_prop_t type;
	uint64_t rid;
	uint64_t quota;
	zfsvfs_t *zfsvfs;
	int err;

	if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
	nvlist_t *attrs;
	VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
	if (nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
	&pair) != 0)
	return (SET_ERROR(EINVAL));
	}

	/*
	* A correctly constructed propname is encoded as
	* userquota@<rid>-<domain>.
	*/
	if ((dash = strchr(propname, '-')) == NULL \|\|
	nvpair_value_uint64_array(pair, &valary, &vallen) != 0 \|\|
	vallen != 3)
	return (SET_ERROR(EINVAL));

	domain = dash + 1;
	type = valary[0];
	rid = valary[1];
	quota = valary[2];

	err = zfsvfs_hold(dsname, FTAG, &zfsvfs, B_FALSE);
	if (err == 0) {
	err = zfs_set_userquota(zfsvfs, type, domain, rid, quota);
	zfsvfs_rele(zfsvfs, FTAG);
	}

	return (err);
	}

	/*
	* If the named property is one that has a special function to set its value,
	* return 0 on success and a positive error code on failure; otherwise if it is
	* not one of the special properties handled by this function, return -1.
	*
	* XXX: It would be better for callers of the property interface if we handled
	* these special cases in dsl_prop.c (in the dsl layer).
	*/
	static int
	zfs_prop_set_special(const char *dsname, zprop_source_t source,
	nvpair_t *pair)
	{
	const char *propname = nvpair_name(pair);
	zfs_prop_t prop = zfs_name_to_prop(propname);
	uint64_t intval = 0;
	const char *strval = NULL;
	int err = -1;

	if (prop == ZPROP_INVAL) {
	if (zfs_prop_userquota(propname))
	return (zfs_prop_set_userquota(dsname, pair));
	return (-1);
	}

	if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
	nvlist_t *attrs;
	VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
	VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
	&pair) == 0);
	}

	/* all special properties are numeric except for keylocation */
	if (zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
	strval = fnvpair_value_string(pair);
	} else {
	intval = fnvpair_value_uint64(pair);
	}

	switch (prop) {
	case ZFS_PROP_QUOTA:
	err = dsl_dir_set_quota(dsname, source, intval);
	break;
	case ZFS_PROP_REFQUOTA:
	err = dsl_dataset_set_refquota(dsname, source, intval);
	break;
	case ZFS_PROP_FILESYSTEM_LIMIT:
	case ZFS_PROP_SNAPSHOT_LIMIT:
	if (intval == UINT64_MAX) {
	/* clearing the limit, just do it */
	err = 0;
	} else {
	err = dsl_dir_activate_fs_ss_limit(dsname);
	}
	/*
	* Set err to -1 to force the zfs_set_prop_nvlist code down the
	* default path to set the value in the nvlist.
	*/
	if (err == 0)
	err = -1;
	break;
	case ZFS_PROP_KEYLOCATION:
	err = dsl_crypto_can_set_keylocation(dsname, strval);

	/*
	* Set err to -1 to force the zfs_set_prop_nvlist code down the
	* default path to set the value in the nvlist.
	*/
	if (err == 0)
	err = -1;
	break;
	case ZFS_PROP_RESERVATION:
	err = dsl_dir_set_reservation(dsname, source, intval);
	break;
	case ZFS_PROP_REFRESERVATION:
	err = dsl_dataset_set_refreservation(dsname, source, intval);
	break;
	case ZFS_PROP_COMPRESSION:
	err = dsl_dataset_set_compression(dsname, source, intval);
	/*
	* Set err to -1 to force the zfs_set_prop_nvlist code down the
	* default path to set the value in the nvlist.
	*/
	if (err == 0)
	err = -1;
	break;
	case ZFS_PROP_VOLSIZE:
	err = zvol_set_volsize(dsname, intval);
	break;
	case ZFS_PROP_SNAPDEV:
	err = zvol_set_snapdev(dsname, source, intval);
	break;
	case ZFS_PROP_VOLMODE:
	err = zvol_set_volmode(dsname, source, intval);
	break;
	case ZFS_PROP_VERSION:
	{
	zfsvfs_t *zfsvfs;

	if ((err = zfsvfs_hold(dsname, FTAG, &zfsvfs, B_TRUE)) != 0)
	break;

	err = zfs_set_version(zfsvfs, intval);
	zfsvfs_rele(zfsvfs, FTAG);

	if (err == 0 && intval >= ZPL_VERSION_USERSPACE) {
	zfs_cmd_t *zc;

	zc = kmem_zalloc(sizeof (zfs_cmd_t), KM_SLEEP);
	(void) strlcpy(zc->zc_name, dsname,
	sizeof (zc->zc_name));
	(void) zfs_ioc_userspace_upgrade(zc);
	(void) zfs_ioc_id_quota_upgrade(zc);
	kmem_free(zc, sizeof (zfs_cmd_t));
	}
	break;
	}
	default:
	err = -1;
	}

	return (err);
	}

	static boolean_t
	zfs_is_namespace_prop(zfs_prop_t prop)
	{
	switch (prop) {

	case ZFS_PROP_ATIME:
	case ZFS_PROP_RELATIME:
	case ZFS_PROP_DEVICES:
	case ZFS_PROP_EXEC:
	case ZFS_PROP_SETUID:
	case ZFS_PROP_READONLY:
	case ZFS_PROP_XATTR:
	case ZFS_PROP_NBMAND:
	return (B_TRUE);

	default:
	return (B_FALSE);
	}
	}

	/*
	* This function is best effort. If it fails to set any of the given properties,
	* it continues to set as many as it can and returns the last error
	* encountered. If the caller provides a non-NULL errlist, it will be filled in
	* with the list of names of all the properties that failed along with the
	* corresponding error numbers.
	*
	* If every property is set successfully, zero is returned and errlist is not
	* modified.
	*/
	int
	zfs_set_prop_nvlist(const char dsname, zprop_source_t source, nvlist_t nvl,
	nvlist_t *errlist)
	{
	nvpair_t *pair;
	nvpair_t *propval;
	int rv = 0;
	uint64_t intval;
	const char *strval;
	boolean_t should_update_mount_cache = B_FALSE;

	nvlist_t *genericnvl = fnvlist_alloc();
	nvlist_t *retrynvl = fnvlist_alloc();
	retry:
	pair = NULL;
	while ((pair = nvlist_next_nvpair(nvl, pair)) != NULL) {
	const char *propname = nvpair_name(pair);
	zfs_prop_t prop = zfs_name_to_prop(propname);
	int err = 0;

	/* decode the property value */
	propval = pair;
	if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
	nvlist_t *attrs;
	attrs = fnvpair_value_nvlist(pair);
	if (nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
	&propval) != 0)
	err = SET_ERROR(EINVAL);
	}

	/* Validate value type */
	if (err == 0 && source == ZPROP_SRC_INHERITED) {
	/* inherited properties are expected to be booleans */
	if (nvpair_type(propval) != DATA_TYPE_BOOLEAN)
	err = SET_ERROR(EINVAL);
	} else if (err == 0 && prop == ZPROP_INVAL) {
	if (zfs_prop_user(propname)) {
	if (nvpair_type(propval) != DATA_TYPE_STRING)
	err = SET_ERROR(EINVAL);
	} else if (zfs_prop_userquota(propname)) {
	if (nvpair_type(propval) !=
	DATA_TYPE_UINT64_ARRAY)
	err = SET_ERROR(EINVAL);
	} else {
	err = SET_ERROR(EINVAL);
	}
	} else if (err == 0) {
	if (nvpair_type(propval) == DATA_TYPE_STRING) {
	if (zfs_prop_get_type(prop) != PROP_TYPE_STRING)
	err = SET_ERROR(EINVAL);
	} else if (nvpair_type(propval) == DATA_TYPE_UINT64) {
	const char *unused;

	intval = fnvpair_value_uint64(propval);

	switch (zfs_prop_get_type(prop)) {
	case PROP_TYPE_NUMBER:
	break;
	case PROP_TYPE_STRING:
	err = SET_ERROR(EINVAL);
	break;
	case PROP_TYPE_INDEX:
	if (zfs_prop_index_to_string(prop,
	intval, &unused) != 0)
	err =
	SET_ERROR(ZFS_ERR_BADPROP);
	break;
	default:
	cmn_err(CE_PANIC,
	"unknown property type");
	}
	} else {
	err = SET_ERROR(EINVAL);
	}
	}

	/* Validate permissions */
	if (err == 0)
	err = zfs_check_settable(dsname, pair, CRED());

	if (err == 0) {
	if (source == ZPROP_SRC_INHERITED)
	err = -1; /* does not need special handling */
	else
	err = zfs_prop_set_special(dsname, source,
	pair);
	if (err == -1) {
	/*
	* For better performance we build up a list of
	* properties to set in a single transaction.
	*/
	err = nvlist_add_nvpair(genericnvl, pair);
	} else if (err != 0 && nvl != retrynvl) {
	/*
	* This may be a spurious error caused by
	* receiving quota and reservation out of order.
	* Try again in a second pass.
	*/
	err = nvlist_add_nvpair(retrynvl, pair);
	}
	}

	if (err != 0) {
	if (errlist != NULL)
	fnvlist_add_int32(errlist, propname, err);
	rv = err;
	}

	if (zfs_is_namespace_prop(prop))
	should_update_mount_cache = B_TRUE;
	}

	if (nvl != retrynvl && !nvlist_empty(retrynvl)) {
	nvl = retrynvl;
	goto retry;
	}

	if (!nvlist_empty(genericnvl) &&
	dsl_props_set(dsname, source, genericnvl) != 0) {
	/*
	* If this fails, we still want to set as many properties as we
	* can, so try setting them individually.
	*/
	pair = NULL;
	while ((pair = nvlist_next_nvpair(genericnvl, pair)) != NULL) {
	const char *propname = nvpair_name(pair);
	int err = 0;

	propval = pair;
	if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
	nvlist_t *attrs;
	attrs = fnvpair_value_nvlist(pair);
	propval = fnvlist_lookup_nvpair(attrs,
	ZPROP_VALUE);
	}

	if (nvpair_type(propval) == DATA_TYPE_STRING) {
	strval = fnvpair_value_string(propval);
	err = dsl_prop_set_string(dsname, propname,
	source, strval);
	} else if (nvpair_type(propval) == DATA_TYPE_BOOLEAN) {
	err = dsl_prop_inherit(dsname, propname,
	source);
	} else {
	intval = fnvpair_value_uint64(propval);
	err = dsl_prop_set_int(dsname, propname, source,
	intval);
	}

	if (err != 0) {
	if (errlist != NULL) {
	fnvlist_add_int32(errlist, propname,
	err);
	}
	rv = err;
	}
	}
	}
	if (should_update_mount_cache)
	zfs_ioctl_update_mount_cache(dsname);

	nvlist_free(genericnvl);
	nvlist_free(retrynvl);

	return (rv);
	}

	/*
	* Check that all the properties are valid user properties.
	*/
	static int
	zfs_check_userprops(nvlist_t *nvl)
	{
	nvpair_t *pair = NULL;

	while ((pair = nvlist_next_nvpair(nvl, pair)) != NULL) {
	const char *propname = nvpair_name(pair);

	if (!zfs_prop_user(propname) \|\|
	nvpair_type(pair) != DATA_TYPE_STRING)
	return (SET_ERROR(EINVAL));

	if (strlen(propname) >= ZAP_MAXNAMELEN)
	return (SET_ERROR(ENAMETOOLONG));

	if (strlen(fnvpair_value_string(pair)) >= ZAP_MAXVALUELEN)
	return (SET_ERROR(E2BIG));
	}
	return (0);
	}

	static void
	props_skip(nvlist_t props, nvlist_t skipped, nvlist_t **newprops)
	{
	nvpair_t *pair;

	VERIFY(nvlist_alloc(newprops, NV_UNIQUE_NAME, KM_SLEEP) == 0);

	pair = NULL;
	while ((pair = nvlist_next_nvpair(props, pair)) != NULL) {
	if (nvlist_exists(skipped, nvpair_name(pair)))
	continue;

	VERIFY(nvlist_add_nvpair(*newprops, pair) == 0);
	}
	}

	static int
	clear_received_props(const char dsname, nvlist_t props,
	nvlist_t *skipped)
	{
	int err = 0;
	nvlist_t *cleared_props = NULL;
	props_skip(props, skipped, &cleared_props);
	if (!nvlist_empty(cleared_props)) {
	/*
	* Acts on local properties until the dataset has received
	* properties at least once on or after SPA_VERSION_RECVD_PROPS.
	*/
	zprop_source_t flags = (ZPROP_SRC_NONE \|
	(dsl_prop_get_hasrecvd(dsname) ? ZPROP_SRC_RECEIVED : 0));
	err = zfs_set_prop_nvlist(dsname, flags, cleared_props, NULL);
	}
	nvlist_free(cleared_props);
	return (err);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_value name of property to set
	* zc_nvlist_src{_size} nvlist of properties to apply
	* zc_cookie received properties flag
	*
	* outputs:
	* zc_nvlist_dst{_size} error for each unapplied received property
	*/
	static int
	zfs_ioc_set_prop(zfs_cmd_t *zc)
	{
	nvlist_t *nvl;
	boolean_t received = zc->zc_cookie;
	zprop_source_t source = (received ? ZPROP_SRC_RECEIVED :
	ZPROP_SRC_LOCAL);
	nvlist_t *errors;
	int error;

	if ((error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &nvl)) != 0)
	return (error);

	if (received) {
	nvlist_t *origprops;

	if (dsl_prop_get_received(zc->zc_name, &origprops) == 0) {
	(void) clear_received_props(zc->zc_name,
	origprops, nvl);
	nvlist_free(origprops);
	}

	error = dsl_prop_set_hasrecvd(zc->zc_name);
	}

	errors = fnvlist_alloc();
	if (error == 0)
	error = zfs_set_prop_nvlist(zc->zc_name, source, nvl, errors);

	if (zc->zc_nvlist_dst != 0 && errors != NULL) {
	(void) put_nvlist(zc, errors);
	}

	nvlist_free(errors);
	nvlist_free(nvl);
	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_value name of property to inherit
	* zc_cookie revert to received value if TRUE
	*
	* outputs: none
	*/
	static int
	zfs_ioc_inherit_prop(zfs_cmd_t *zc)
	{
	const char *propname = zc->zc_value;
	zfs_prop_t prop = zfs_name_to_prop(propname);
	boolean_t received = zc->zc_cookie;
	zprop_source_t source = (received
	? ZPROP_SRC_NONE /* revert to received value, if any */
	: ZPROP_SRC_INHERITED); /* explicitly inherit */
	nvlist_t *dummy;
	nvpair_t *pair;
	zprop_type_t type;
	int err;

	if (!received) {
	/*
	* Only check this in the non-received case. We want to allow
	* 'inherit -S' to revert non-inheritable properties like quota
	* and reservation to the received or default values even though
	* they are not considered inheritable.
	*/
	if (prop != ZPROP_INVAL && !zfs_prop_inheritable(prop))
	return (SET_ERROR(EINVAL));
	}

	if (prop == ZPROP_INVAL) {
	if (!zfs_prop_user(propname))
	return (SET_ERROR(EINVAL));

	type = PROP_TYPE_STRING;
	} else if (prop == ZFS_PROP_VOLSIZE \|\| prop == ZFS_PROP_VERSION) {
	return (SET_ERROR(EINVAL));
	} else {
	type = zfs_prop_get_type(prop);
	}

	/*
	* zfs_prop_set_special() expects properties in the form of an
	* nvpair with type info.
	*/
	dummy = fnvlist_alloc();

	switch (type) {
	case PROP_TYPE_STRING:
	VERIFY(0 == nvlist_add_string(dummy, propname, ""));
	break;
	case PROP_TYPE_NUMBER:
	case PROP_TYPE_INDEX:
	VERIFY(0 == nvlist_add_uint64(dummy, propname, 0));
	break;
	default:
	err = SET_ERROR(EINVAL);
	goto errout;
	}

	pair = nvlist_next_nvpair(dummy, NULL);
	if (pair == NULL) {
	err = SET_ERROR(EINVAL);
	} else {
	err = zfs_prop_set_special(zc->zc_name, source, pair);
	if (err == -1) /* property is not "special", needs handling */
	err = dsl_prop_inherit(zc->zc_name, zc->zc_value,
	source);
	}

	errout:
	nvlist_free(dummy);
	return (err);
	}

	static int
	zfs_ioc_pool_set_props(zfs_cmd_t *zc)
	{
	nvlist_t *props;
	spa_t *spa;
	int error;
	nvpair_t *pair;

	if ((error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &props)))
	return (error);

	/*
	* If the only property is the configfile, then just do a spa_lookup()
	* to handle the faulted case.
	*/
	pair = nvlist_next_nvpair(props, NULL);
	if (pair != NULL && strcmp(nvpair_name(pair),
	zpool_prop_to_name(ZPOOL_PROP_CACHEFILE)) == 0 &&
	nvlist_next_nvpair(props, pair) == NULL) {
	mutex_enter(&spa_namespace_lock);
	if ((spa = spa_lookup(zc->zc_name)) != NULL) {
	spa_configfile_set(spa, props, B_FALSE);
	spa_write_cachefile(spa, B_FALSE, B_TRUE);
	}
	mutex_exit(&spa_namespace_lock);
	if (spa != NULL) {
	nvlist_free(props);
	return (0);
	}
	}

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0) {
	nvlist_free(props);
	return (error);
	}

	error = spa_prop_set(spa, props);

	nvlist_free(props);
	spa_close(spa, FTAG);

	return (error);
	}

	static int
	zfs_ioc_pool_get_props(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;
	nvlist_t *nvp = NULL;

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0) {
	/*
	* If the pool is faulted, there may be properties we can still
	* get (such as altroot and cachefile), so attempt to get them
	* anyway.
	*/
	mutex_enter(&spa_namespace_lock);
	if ((spa = spa_lookup(zc->zc_name)) != NULL)
	error = spa_prop_get(spa, &nvp);
	mutex_exit(&spa_namespace_lock);
	} else {
	error = spa_prop_get(spa, &nvp);
	spa_close(spa, FTAG);
	}

	if (error == 0 && zc->zc_nvlist_dst != 0)
	error = put_nvlist(zc, nvp);
	else
	error = SET_ERROR(EFAULT);

	nvlist_free(nvp);
	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_nvlist_src{_size} nvlist of delegated permissions
	* zc_perm_action allow/unallow flag
	*
	* outputs: none
	*/
	static int
	zfs_ioc_set_fsacl(zfs_cmd_t *zc)
	{
	int error;
	nvlist_t *fsaclnv = NULL;

	if ((error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &fsaclnv)) != 0)
	return (error);

	/*
	* Verify nvlist is constructed correctly
	*/
	if ((error = zfs_deleg_verify_nvlist(fsaclnv)) != 0) {
	nvlist_free(fsaclnv);
	return (SET_ERROR(EINVAL));
	}

	/*
	* If we don't have PRIV_SYS_MOUNT, then validate
	* that user is allowed to hand out each permission in
	* the nvlist(s)
	*/

	error = secpolicy_zfs(CRED());
	if (error != 0) {
	if (zc->zc_perm_action == B_FALSE) {
	error = dsl_deleg_can_allow(zc->zc_name,
	fsaclnv, CRED());
	} else {
	error = dsl_deleg_can_unallow(zc->zc_name,
	fsaclnv, CRED());
	}
	}

	if (error == 0)
	error = dsl_deleg_set(zc->zc_name, fsaclnv, zc->zc_perm_action);

	nvlist_free(fsaclnv);
	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	*
	* outputs:
	* zc_nvlist_src{_size} nvlist of delegated permissions
	*/
	static int
	zfs_ioc_get_fsacl(zfs_cmd_t *zc)
	{
	nvlist_t *nvp;
	int error;

	if ((error = dsl_deleg_get(zc->zc_name, &nvp)) == 0) {
	error = put_nvlist(zc, nvp);
	nvlist_free(nvp);
	}

	return (error);
	}

	/* ARGSUSED */
	static void
	zfs_create_cb(objset_t os, void arg, cred_t cr, dmu_tx_t tx)
	{
	zfs_creat_t *zct = arg;

	zfs_create_fs(os, cr, zct->zct_zplprops, tx);
	}

	#define ZFS_PROP_UNDEFINED ((uint64_t)-1)

	/*
	* inputs:
	* os parent objset pointer (NULL if root fs)
	* fuids_ok fuids allowed in this version of the spa?
	* sa_ok SAs allowed in this version of the spa?
	* createprops list of properties requested by creator
	*
	* outputs:
	* zplprops values for the zplprops we attach to the master node object
	* is_ci true if requested file system will be purely case-insensitive
	*
	* Determine the settings for utf8only, normalization and
	* casesensitivity. Specific values may have been requested by the
	* creator and/or we can inherit values from the parent dataset. If
	* the file system is of too early a vintage, a creator can not
	* request settings for these properties, even if the requested
	* setting is the default value. We don't actually want to create dsl
	* properties for these, so remove them from the source nvlist after
	* processing.
	*/
	static int
	zfs_fill_zplprops_impl(objset_t *os, uint64_t zplver,
	boolean_t fuids_ok, boolean_t sa_ok, nvlist_t *createprops,
	nvlist_t zplprops, boolean_t is_ci)
	{
	uint64_t sense = ZFS_PROP_UNDEFINED;
	uint64_t norm = ZFS_PROP_UNDEFINED;
	uint64_t u8 = ZFS_PROP_UNDEFINED;
	int error;

	ASSERT(zplprops != NULL);

	/* parent dataset must be a filesystem */
	if (os != NULL && os->os_phys->os_type != DMU_OST_ZFS)
	return (SET_ERROR(ZFS_ERR_WRONG_PARENT));

	/*
	* Pull out creator prop choices, if any.
	*/
	if (createprops) {
	(void) nvlist_lookup_uint64(createprops,
	zfs_prop_to_name(ZFS_PROP_VERSION), &zplver);
	(void) nvlist_lookup_uint64(createprops,
	zfs_prop_to_name(ZFS_PROP_NORMALIZE), &norm);
	(void) nvlist_remove_all(createprops,
	zfs_prop_to_name(ZFS_PROP_NORMALIZE));
	(void) nvlist_lookup_uint64(createprops,
	zfs_prop_to_name(ZFS_PROP_UTF8ONLY), &u8);
	(void) nvlist_remove_all(createprops,
	zfs_prop_to_name(ZFS_PROP_UTF8ONLY));
	(void) nvlist_lookup_uint64(createprops,
	zfs_prop_to_name(ZFS_PROP_CASE), &sense);
	(void) nvlist_remove_all(createprops,
	zfs_prop_to_name(ZFS_PROP_CASE));
	}

	/*
	* If the zpl version requested is whacky or the file system
	* or pool is version is too "young" to support normalization
	* and the creator tried to set a value for one of the props,
	* error out.
	*/
	if ((zplver < ZPL_VERSION_INITIAL \|\| zplver > ZPL_VERSION) \|\|
	(zplver >= ZPL_VERSION_FUID && !fuids_ok) \|\|
	(zplver >= ZPL_VERSION_SA && !sa_ok) \|\|
	(zplver < ZPL_VERSION_NORMALIZATION &&
	(norm != ZFS_PROP_UNDEFINED \|\| u8 != ZFS_PROP_UNDEFINED \|\|
	sense != ZFS_PROP_UNDEFINED)))
	return (SET_ERROR(ENOTSUP));

	/*
	* Put the version in the zplprops
	*/
	VERIFY(nvlist_add_uint64(zplprops,
	zfs_prop_to_name(ZFS_PROP_VERSION), zplver) == 0);

	if (norm == ZFS_PROP_UNDEFINED &&
	(error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &norm)) != 0)
	return (error);
	VERIFY(nvlist_add_uint64(zplprops,
	zfs_prop_to_name(ZFS_PROP_NORMALIZE), norm) == 0);

	/*
	* If we're normalizing, names must always be valid UTF-8 strings.
	*/
	if (norm)
	u8 = 1;
	if (u8 == ZFS_PROP_UNDEFINED &&
	(error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &u8)) != 0)
	return (error);
	VERIFY(nvlist_add_uint64(zplprops,
	zfs_prop_to_name(ZFS_PROP_UTF8ONLY), u8) == 0);

	if (sense == ZFS_PROP_UNDEFINED &&
	(error = zfs_get_zplprop(os, ZFS_PROP_CASE, &sense)) != 0)
	return (error);
	VERIFY(nvlist_add_uint64(zplprops,
	zfs_prop_to_name(ZFS_PROP_CASE), sense) == 0);

	if (is_ci)
	*is_ci = (sense == ZFS_CASE_INSENSITIVE);

	return (0);
	}

	static int
	zfs_fill_zplprops(const char dataset, nvlist_t createprops,
	nvlist_t zplprops, boolean_t is_ci)
	{
	boolean_t fuids_ok, sa_ok;
	uint64_t zplver = ZPL_VERSION;
	objset_t *os = NULL;
	char parentname[ZFS_MAX_DATASET_NAME_LEN];
	spa_t *spa;
	uint64_t spa_vers;
	int error;

	zfs_get_parent(dataset, parentname, sizeof (parentname));

	if ((error = spa_open(dataset, &spa, FTAG)) != 0)
	return (error);

	spa_vers = spa_version(spa);
	spa_close(spa, FTAG);

	zplver = zfs_zpl_version_map(spa_vers);
	fuids_ok = (zplver >= ZPL_VERSION_FUID);
	sa_ok = (zplver >= ZPL_VERSION_SA);

	/*
	* Open parent object set so we can inherit zplprop values.
	*/
	if ((error = dmu_objset_hold(parentname, FTAG, &os)) != 0)
	return (error);

	error = zfs_fill_zplprops_impl(os, zplver, fuids_ok, sa_ok, createprops,
	zplprops, is_ci);
	dmu_objset_rele(os, FTAG);
	return (error);
	}

	static int
	zfs_fill_zplprops_root(uint64_t spa_vers, nvlist_t *createprops,
	nvlist_t zplprops, boolean_t is_ci)
	{
	boolean_t fuids_ok;
	boolean_t sa_ok;
	uint64_t zplver = ZPL_VERSION;
	int error;

	zplver = zfs_zpl_version_map(spa_vers);
	fuids_ok = (zplver >= ZPL_VERSION_FUID);
	sa_ok = (zplver >= ZPL_VERSION_SA);

	error = zfs_fill_zplprops_impl(NULL, zplver, fuids_ok, sa_ok,
	createprops, zplprops, is_ci);
	return (error);
	}

	/*
	* innvl: {
	* "type" -> dmu_objset_type_t (int32)
	* (optional) "props" -> { prop -> value }
	* (optional) "hidden_args" -> { "wkeydata" -> value }
	* raw uint8_t array of encryption wrapping key data (32 bytes)
	* }
	*
	* outnvl: propname -> error code (int32)
	*/

	static const zfs_ioc_key_t zfs_keys_create[] = {
	{"type", DATA_TYPE_INT32, 0},
	{"props", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	{"hidden_args", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	};

	static int
	zfs_ioc_create(const char fsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	int error = 0;
	zfs_creat_t zct = { 0 };
	nvlist_t *nvprops = NULL;
	nvlist_t *hidden_args = NULL;
	void (cbfunc)(objset_t os, void arg, cred_t cr, dmu_tx_t *tx);
	dmu_objset_type_t type;
	boolean_t is_insensitive = B_FALSE;
	dsl_crypto_params_t *dcp = NULL;

	type = (dmu_objset_type_t)fnvlist_lookup_int32(innvl, "type");
	(void) nvlist_lookup_nvlist(innvl, "props", &nvprops);
	(void) nvlist_lookup_nvlist(innvl, ZPOOL_HIDDEN_ARGS, &hidden_args);

	switch (type) {
	case DMU_OST_ZFS:
	cbfunc = zfs_create_cb;
	break;

	case DMU_OST_ZVOL:
	cbfunc = zvol_create_cb;
	break;

	default:
	cbfunc = NULL;
	break;
	}
	if (strchr(fsname, '@') \|\|
	strchr(fsname, '%'))
	return (SET_ERROR(EINVAL));

	zct.zct_props = nvprops;

	if (cbfunc == NULL)
	return (SET_ERROR(EINVAL));

	if (type == DMU_OST_ZVOL) {
	uint64_t volsize, volblocksize;

	if (nvprops == NULL)
	return (SET_ERROR(EINVAL));
	if (nvlist_lookup_uint64(nvprops,
	zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) != 0)
	return (SET_ERROR(EINVAL));

	if ((error = nvlist_lookup_uint64(nvprops,
	zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
	&volblocksize)) != 0 && error != ENOENT)
	return (SET_ERROR(EINVAL));

	if (error != 0)
	volblocksize = zfs_prop_default_numeric(
	ZFS_PROP_VOLBLOCKSIZE);

	if ((error = zvol_check_volblocksize(fsname,
	volblocksize)) != 0 \|\|
	(error = zvol_check_volsize(volsize,
	volblocksize)) != 0)
	return (error);
	} else if (type == DMU_OST_ZFS) {
	int error;

	/*
	* We have to have normalization and
	* case-folding flags correct when we do the
	* file system creation, so go figure them out
	* now.
	*/
	VERIFY(nvlist_alloc(&zct.zct_zplprops,
	NV_UNIQUE_NAME, KM_SLEEP) == 0);
	error = zfs_fill_zplprops(fsname, nvprops,
	zct.zct_zplprops, &is_insensitive);
	if (error != 0) {
	nvlist_free(zct.zct_zplprops);
	return (error);
	}
	}

	error = dsl_crypto_params_create_nvlist(DCP_CMD_NONE, nvprops,
	hidden_args, &dcp);
	if (error != 0) {
	nvlist_free(zct.zct_zplprops);
	return (error);
	}

	error = dmu_objset_create(fsname, type,
	is_insensitive ? DS_FLAG_CI_DATASET : 0, dcp, cbfunc, &zct);

	nvlist_free(zct.zct_zplprops);
	dsl_crypto_params_free(dcp, !!error);

	/*
	* It would be nice to do this atomically.
	*/
	if (error == 0) {
	error = zfs_set_prop_nvlist(fsname, ZPROP_SRC_LOCAL,
	nvprops, outnvl);
	if (error != 0) {
	spa_t *spa;
	int error2;

	/*
	* Volumes will return EBUSY and cannot be destroyed
	* until all asynchronous minor handling (e.g. from
	* setting the volmode property) has completed. Wait for
	* the spa_zvol_taskq to drain then retry.
	*/
	error2 = dsl_destroy_head(fsname);
	while ((error2 == EBUSY) && (type == DMU_OST_ZVOL)) {
	error2 = spa_open(fsname, &spa, FTAG);
	if (error2 == 0) {
	taskq_wait(spa->spa_zvol_taskq);
	spa_close(spa, FTAG);
	}
	error2 = dsl_destroy_head(fsname);
	}
	}
	}
	return (error);
	}

	/*
	* innvl: {
	* "origin" -> name of origin snapshot
	* (optional) "props" -> { prop -> value }
	* (optional) "hidden_args" -> { "wkeydata" -> value }
	* raw uint8_t array of encryption wrapping key data (32 bytes)
	* }
	*
	* outputs:
	* outnvl: propname -> error code (int32)
	*/
	static const zfs_ioc_key_t zfs_keys_clone[] = {
	{"origin", DATA_TYPE_STRING, 0},
	{"props", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	{"hidden_args", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	};

	static int
	zfs_ioc_clone(const char fsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	int error = 0;
	nvlist_t *nvprops = NULL;
	const char *origin_name;

	origin_name = fnvlist_lookup_string(innvl, "origin");
	(void) nvlist_lookup_nvlist(innvl, "props", &nvprops);

	if (strchr(fsname, '@') \|\|
	strchr(fsname, '%'))
	return (SET_ERROR(EINVAL));

	if (dataset_namecheck(origin_name, NULL, NULL) != 0)
	return (SET_ERROR(EINVAL));

	error = dmu_objset_clone(fsname, origin_name);

	/*
	* It would be nice to do this atomically.
	*/
	if (error == 0) {
	error = zfs_set_prop_nvlist(fsname, ZPROP_SRC_LOCAL,
	nvprops, outnvl);
	if (error != 0)
	(void) dsl_destroy_head(fsname);
	}
	return (error);
	}

	static const zfs_ioc_key_t zfs_keys_remap[] = {
	/* no nvl keys */
	};

	/* ARGSUSED */
	static int
	zfs_ioc_remap(const char fsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	/* This IOCTL is no longer supported. */
	return (0);
	}

	/*
	* innvl: {
	* "snaps" -> { snapshot1, snapshot2 }
	* (optional) "props" -> { prop -> value (string) }
	* }
	*
	* outnvl: snapshot -> error code (int32)
	*/
	static const zfs_ioc_key_t zfs_keys_snapshot[] = {
	{"snaps", DATA_TYPE_NVLIST, 0},
	{"props", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	};

	static int
	zfs_ioc_snapshot(const char poolname, nvlist_t innvl, nvlist_t *outnvl)
	{
	nvlist_t *snaps;
	nvlist_t *props = NULL;
	int error, poollen;
	nvpair_t *pair;

	(void) nvlist_lookup_nvlist(innvl, "props", &props);
	if (!nvlist_empty(props) &&
	zfs_earlier_version(poolname, SPA_VERSION_SNAP_PROPS))
	return (SET_ERROR(ENOTSUP));
	if ((error = zfs_check_userprops(props)) != 0)
	return (error);

	snaps = fnvlist_lookup_nvlist(innvl, "snaps");
	poollen = strlen(poolname);
	for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
	pair = nvlist_next_nvpair(snaps, pair)) {
	const char *name = nvpair_name(pair);
	char *cp = strchr(name, '@');

	/*
	* The snap name must contain an @, and the part after it must
	* contain only valid characters.
	*/
	if (cp == NULL \|\|
	zfs_component_namecheck(cp + 1, NULL, NULL) != 0)
	return (SET_ERROR(EINVAL));

	/*
	* The snap must be in the specified pool.
	*/
	if (strncmp(name, poolname, poollen) != 0 \|\|
	(name[poollen] != '/' && name[poollen] != '@'))
	return (SET_ERROR(EXDEV));

	/*
	* Check for permission to set the properties on the fs.
	*/
	if (!nvlist_empty(props)) {
	*cp = '\0';
	error = zfs_secpolicy_write_perms(name,
	ZFS_DELEG_PERM_USERPROP, CRED());
	*cp = '@';
	if (error != 0)
	return (error);
	}

	/* This must be the only snap of this fs. */
	for (nvpair_t *pair2 = nvlist_next_nvpair(snaps, pair);
	pair2 != NULL; pair2 = nvlist_next_nvpair(snaps, pair2)) {
	if (strncmp(name, nvpair_name(pair2), cp - name + 1)
	== 0) {
	return (SET_ERROR(EXDEV));
	}
	}
	}

	error = dsl_dataset_snapshot(snaps, props, outnvl);

	return (error);
	}

	/*
	* innvl: "message" -> string
	*/
	static const zfs_ioc_key_t zfs_keys_log_history[] = {
	{"message", DATA_TYPE_STRING, 0},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_log_history(const char unused, nvlist_t innvl, nvlist_t *outnvl)
	{
	const char *message;
	char *poolname;
	spa_t *spa;
	int error;

	/*
	* The poolname in the ioctl is not set, we get it from the TSD,
	* which was set at the end of the last successful ioctl that allows
	* logging. The secpolicy func already checked that it is set.
	* Only one log ioctl is allowed after each successful ioctl, so
	* we clear the TSD here.
	*/
	poolname = tsd_get(zfs_allow_log_key);
	if (poolname == NULL)
	return (SET_ERROR(EINVAL));
	(void) tsd_set(zfs_allow_log_key, NULL);
	error = spa_open(poolname, &spa, FTAG);
	kmem_strfree(poolname);
	if (error != 0)
	return (error);

	message = fnvlist_lookup_string(innvl, "message");

	if (spa_version(spa) < SPA_VERSION_ZPOOL_HISTORY) {
	spa_close(spa, FTAG);
	return (SET_ERROR(ENOTSUP));
	}

	error = spa_history_log(spa, message);
	spa_close(spa, FTAG);
	return (error);
	}

	/*
	* This ioctl is used to set the bootenv configuration on the current
	* pool. This configuration is stored in the second padding area of the label,
	* and it is used by the bootloader(s) to store the bootloader and/or system
	* specific data.
	* The data is stored as nvlist data stream, and is protected by
	* an embedded checksum.
	* The version can have two possible values:
	* VB_RAW: nvlist should have key GRUB_ENVMAP, value DATA_TYPE_STRING.
	* VB_NVLIST: nvlist with arbitrary <key, value> pairs.
	*/
	static const zfs_ioc_key_t zfs_keys_set_bootenv[] = {
	{"version", DATA_TYPE_UINT64, 0},
	{"<keys>", DATA_TYPE_ANY, ZK_OPTIONAL \| ZK_WILDCARDLIST},
	};

	static int
	zfs_ioc_set_bootenv(const char name, nvlist_t innvl, nvlist_t *outnvl)
	{
	int error;
	spa_t *spa;

	if ((error = spa_open(name, &spa, FTAG)) != 0)
	return (error);
	spa_vdev_state_enter(spa, SCL_ALL);
	error = vdev_label_write_bootenv(spa->spa_root_vdev, innvl);
	(void) spa_vdev_state_exit(spa, NULL, 0);
	spa_close(spa, FTAG);
	return (error);
	}

	static const zfs_ioc_key_t zfs_keys_get_bootenv[] = {
	/* no nvl keys */
	};

	static int
	zfs_ioc_get_bootenv(const char name, nvlist_t innvl, nvlist_t *outnvl)
	{
	spa_t *spa;
	int error;

	if ((error = spa_open(name, &spa, FTAG)) != 0)
	return (error);
	spa_vdev_state_enter(spa, SCL_ALL);
	error = vdev_label_read_bootenv(spa->spa_root_vdev, outnvl);
	(void) spa_vdev_state_exit(spa, NULL, 0);
	spa_close(spa, FTAG);
	return (error);
	}

	/*
	* The dp_config_rwlock must not be held when calling this, because the
	* unmount may need to write out data.
	*
	* This function is best-effort. Callers must deal gracefully if it
	* remains mounted (or is remounted after this call).
	*
	* Returns 0 if the argument is not a snapshot, or it is not currently a
	* filesystem, or we were able to unmount it. Returns error code otherwise.
	*/
	void
	zfs_unmount_snap(const char *snapname)
	{
	if (strchr(snapname, '@') == NULL)
	return;

	(void) zfsctl_snapshot_unmount(snapname, MNT_FORCE);
	}

	/* ARGSUSED */
	static int
	zfs_unmount_snap_cb(const char snapname, void arg)
	{
	zfs_unmount_snap(snapname);
	return (0);
	}

	/*
	* When a clone is destroyed, its origin may also need to be destroyed,
	* in which case it must be unmounted. This routine will do that unmount
	* if necessary.
	*/
	void
	zfs_destroy_unmount_origin(const char *fsname)
	{
	int error;
	objset_t *os;
	dsl_dataset_t *ds;

	error = dmu_objset_hold(fsname, FTAG, &os);
	if (error != 0)
	return;
	ds = dmu_objset_ds(os);
	if (dsl_dir_is_clone(ds->ds_dir) && DS_IS_DEFER_DESTROY(ds->ds_prev)) {
	char originname[ZFS_MAX_DATASET_NAME_LEN];
	dsl_dataset_name(ds->ds_prev, originname);
	dmu_objset_rele(os, FTAG);
	zfs_unmount_snap(originname);
	} else {
	dmu_objset_rele(os, FTAG);
	}
	}

	/*
	* innvl: {
	* "snaps" -> { snapshot1, snapshot2 }
	* (optional boolean) "defer"
	* }
	*
	* outnvl: snapshot -> error code (int32)
	*/
	static const zfs_ioc_key_t zfs_keys_destroy_snaps[] = {
	{"snaps", DATA_TYPE_NVLIST, 0},
	{"defer", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_destroy_snaps(const char poolname, nvlist_t innvl, nvlist_t *outnvl)
	{
	int poollen;
	nvlist_t *snaps;
	nvpair_t *pair;
	boolean_t defer;
	spa_t *spa;

	snaps = fnvlist_lookup_nvlist(innvl, "snaps");
	defer = nvlist_exists(innvl, "defer");

	poollen = strlen(poolname);
	for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
	pair = nvlist_next_nvpair(snaps, pair)) {
	const char *name = nvpair_name(pair);

	/*
	* The snap must be in the specified pool to prevent the
	* invalid removal of zvol minors below.
	*/
	if (strncmp(name, poolname, poollen) != 0 \|\|
	(name[poollen] != '/' && name[poollen] != '@'))
	return (SET_ERROR(EXDEV));

	zfs_unmount_snap(nvpair_name(pair));
	if (spa_open(name, &spa, FTAG) == 0) {
	zvol_remove_minors(spa, name, B_TRUE);
	spa_close(spa, FTAG);
	}
	}

	return (dsl_destroy_snapshots_nvl(snaps, defer, outnvl));
	}

	/*
	* Create bookmarks. The bookmark names are of the form <fs>#<bmark>.
	* All bookmarks and snapshots must be in the same pool.
	* dsl_bookmark_create_nvl_validate describes the nvlist schema in more detail.
	*
	* innvl: {
	* new_bookmark1 -> existing_snapshot,
	* new_bookmark2 -> existing_bookmark,
	* }
	*
	* outnvl: bookmark -> error code (int32)
	*
	*/
	static const zfs_ioc_key_t zfs_keys_bookmark[] = {
	{"<bookmark>...", DATA_TYPE_STRING, ZK_WILDCARDLIST},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_bookmark(const char poolname, nvlist_t innvl, nvlist_t *outnvl)
	{
	return (dsl_bookmark_create(innvl, outnvl));
	}

	/*
	* innvl: {
	* property 1, property 2, ...
	* }
	*
	* outnvl: {
	* bookmark name 1 -> { property 1, property 2, ... },
	* bookmark name 2 -> { property 1, property 2, ... }
	* }
	*
	*/
	static const zfs_ioc_key_t zfs_keys_get_bookmarks[] = {
	{"<property>...", DATA_TYPE_BOOLEAN, ZK_WILDCARDLIST \| ZK_OPTIONAL},
	};

	static int
	zfs_ioc_get_bookmarks(const char fsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	return (dsl_get_bookmarks(fsname, innvl, outnvl));
	}

	/*
	* innvl is not used.
	*
	* outnvl: {
	* property 1, property 2, ...
	* }
	*
	*/
	static const zfs_ioc_key_t zfs_keys_get_bookmark_props[] = {
	/* no nvl keys */
	};

	/* ARGSUSED */
	static int
	zfs_ioc_get_bookmark_props(const char bookmark, nvlist_t innvl,
	nvlist_t *outnvl)
	{
	char fsname[ZFS_MAX_DATASET_NAME_LEN];
	char *bmname;

	bmname = strchr(bookmark, '#');
	if (bmname == NULL)
	return (SET_ERROR(EINVAL));
	bmname++;

	(void) strlcpy(fsname, bookmark, sizeof (fsname));
	*(strchr(fsname, '#')) = '\0';

	return (dsl_get_bookmark_props(fsname, bmname, outnvl));
	}

	/*
	* innvl: {
	* bookmark name 1, bookmark name 2
	* }
	*
	* outnvl: bookmark -> error code (int32)
	*
	*/
	static const zfs_ioc_key_t zfs_keys_destroy_bookmarks[] = {
	{"<bookmark>...", DATA_TYPE_BOOLEAN, ZK_WILDCARDLIST},
	};

	static int
	zfs_ioc_destroy_bookmarks(const char poolname, nvlist_t innvl,
	nvlist_t *outnvl)
	{
	int error, poollen;

	poollen = strlen(poolname);
	for (nvpair_t *pair = nvlist_next_nvpair(innvl, NULL);
	pair != NULL; pair = nvlist_next_nvpair(innvl, pair)) {
	const char *name = nvpair_name(pair);
	const char *cp = strchr(name, '#');

	/*
	* The bookmark name must contain an #, and the part after it
	* must contain only valid characters.
	*/
	if (cp == NULL \|\|
	zfs_component_namecheck(cp + 1, NULL, NULL) != 0)
	return (SET_ERROR(EINVAL));

	/*
	* The bookmark must be in the specified pool.
	*/
	if (strncmp(name, poolname, poollen) != 0 \|\|
	(name[poollen] != '/' && name[poollen] != '#'))
	return (SET_ERROR(EXDEV));
	}

	error = dsl_bookmark_destroy(innvl, outnvl);
	return (error);
	}

	static const zfs_ioc_key_t zfs_keys_channel_program[] = {
	{"program", DATA_TYPE_STRING, 0},
	{"arg", DATA_TYPE_ANY, 0},
	{"sync", DATA_TYPE_BOOLEAN_VALUE, ZK_OPTIONAL},
	{"instrlimit", DATA_TYPE_UINT64, ZK_OPTIONAL},
	{"memlimit", DATA_TYPE_UINT64, ZK_OPTIONAL},
	};

	static int
	zfs_ioc_channel_program(const char poolname, nvlist_t innvl,
	nvlist_t *outnvl)
	{
	char *program;
	uint64_t instrlimit, memlimit;
	boolean_t sync_flag;
	nvpair_t *nvarg = NULL;

	program = fnvlist_lookup_string(innvl, ZCP_ARG_PROGRAM);
	if (0 != nvlist_lookup_boolean_value(innvl, ZCP_ARG_SYNC, &sync_flag)) {
	sync_flag = B_TRUE;
	}
	if (0 != nvlist_lookup_uint64(innvl, ZCP_ARG_INSTRLIMIT, &instrlimit)) {
	instrlimit = ZCP_DEFAULT_INSTRLIMIT;
	}
	if (0 != nvlist_lookup_uint64(innvl, ZCP_ARG_MEMLIMIT, &memlimit)) {
	memlimit = ZCP_DEFAULT_MEMLIMIT;
	}
	nvarg = fnvlist_lookup_nvpair(innvl, ZCP_ARG_ARGLIST);

	if (instrlimit == 0 \|\| instrlimit > zfs_lua_max_instrlimit)
	return (SET_ERROR(EINVAL));
	if (memlimit == 0 \|\| memlimit > zfs_lua_max_memlimit)
	return (SET_ERROR(EINVAL));

	return (zcp_eval(poolname, program, sync_flag, instrlimit, memlimit,
	nvarg, outnvl));
	}

	/*
	* innvl: unused
	* outnvl: empty
	*/
	static const zfs_ioc_key_t zfs_keys_pool_checkpoint[] = {
	/* no nvl keys */
	};

	/* ARGSUSED */
	static int
	zfs_ioc_pool_checkpoint(const char poolname, nvlist_t innvl, nvlist_t *outnvl)
	{
	return (spa_checkpoint(poolname));
	}

	/*
	* innvl: unused
	* outnvl: empty
	*/
	static const zfs_ioc_key_t zfs_keys_pool_discard_checkpoint[] = {
	/* no nvl keys */
	};

	/* ARGSUSED */
	static int
	zfs_ioc_pool_discard_checkpoint(const char poolname, nvlist_t innvl,
	nvlist_t *outnvl)
	{
	return (spa_checkpoint_discard(poolname));
	}

	/*
	* inputs:
	* zc_name name of dataset to destroy
	* zc_defer_destroy mark for deferred destroy
	*
	* outputs: none
	*/
	static int
	zfs_ioc_destroy(zfs_cmd_t *zc)
	{
	objset_t *os;
	dmu_objset_type_t ost;
	int err;

	err = dmu_objset_hold(zc->zc_name, FTAG, &os);
	if (err != 0)
	return (err);
	ost = dmu_objset_type(os);
	dmu_objset_rele(os, FTAG);

	if (ost == DMU_OST_ZFS)
	zfs_unmount_snap(zc->zc_name);

	if (strchr(zc->zc_name, '@')) {
	err = dsl_destroy_snapshot(zc->zc_name, zc->zc_defer_destroy);
	} else {
	err = dsl_destroy_head(zc->zc_name);
	if (err == EEXIST) {
	/*
	* It is possible that the given DS may have
	* hidden child (%recv) datasets - "leftovers"
	* resulting from the previously interrupted
	* 'zfs receive'.
	*
	* 6 extra bytes for /%recv
	*/
	char namebuf[ZFS_MAX_DATASET_NAME_LEN + 6];

	if (snprintf(namebuf, sizeof (namebuf), "%s/%s",
	zc->zc_name, recv_clone_name) >=
	sizeof (namebuf))
	return (SET_ERROR(EINVAL));

	/*
	* Try to remove the hidden child (%recv) and after
	* that try to remove the target dataset.
	* If the hidden child (%recv) does not exist
	* the original error (EEXIST) will be returned
	*/
	err = dsl_destroy_head(namebuf);
	if (err == 0)
	err = dsl_destroy_head(zc->zc_name);
	else if (err == ENOENT)
	err = SET_ERROR(EEXIST);
	}
	}

	return (err);
	}

	/*
	* innvl: {
	* "initialize_command" -> POOL_INITIALIZE_{CANCEL\|START\|SUSPEND} (uint64)
	* "initialize_vdevs": { -> guids to initialize (nvlist)
	* "vdev_path_1": vdev_guid_1, (uint64),
	* "vdev_path_2": vdev_guid_2, (uint64),
	* ...
	* },
	* }
	*
	* outnvl: {
	* "initialize_vdevs": { -> initialization errors (nvlist)
	* "vdev_path_1": errno, see function body for possible errnos (uint64)
	* "vdev_path_2": errno, ... (uint64)
	* ...
	* }
	* }
	*
	* EINVAL is returned for an unknown commands or if any of the provided vdev
	* guids have be specified with a type other than uint64.
	*/
	static const zfs_ioc_key_t zfs_keys_pool_initialize[] = {
	{ZPOOL_INITIALIZE_COMMAND, DATA_TYPE_UINT64, 0},
	{ZPOOL_INITIALIZE_VDEVS, DATA_TYPE_NVLIST, 0}
	};

	static int
	zfs_ioc_pool_initialize(const char poolname, nvlist_t innvl, nvlist_t *outnvl)
	{
	uint64_t cmd_type;
	if (nvlist_lookup_uint64(innvl, ZPOOL_INITIALIZE_COMMAND,
	&cmd_type) != 0) {
	return (SET_ERROR(EINVAL));
	}

	if (!(cmd_type == POOL_INITIALIZE_CANCEL \|\|
	cmd_type == POOL_INITIALIZE_START \|\|
	cmd_type == POOL_INITIALIZE_SUSPEND)) {
	return (SET_ERROR(EINVAL));
	}

	nvlist_t *vdev_guids;
	if (nvlist_lookup_nvlist(innvl, ZPOOL_INITIALIZE_VDEVS,
	&vdev_guids) != 0) {
	return (SET_ERROR(EINVAL));
	}

	for (nvpair_t *pair = nvlist_next_nvpair(vdev_guids, NULL);
	pair != NULL; pair = nvlist_next_nvpair(vdev_guids, pair)) {
	uint64_t vdev_guid;
	if (nvpair_value_uint64(pair, &vdev_guid) != 0) {
	return (SET_ERROR(EINVAL));
	}
	}

	spa_t *spa;
	int error = spa_open(poolname, &spa, FTAG);
	if (error != 0)
	return (error);

	nvlist_t *vdev_errlist = fnvlist_alloc();
	int total_errors = spa_vdev_initialize(spa, vdev_guids, cmd_type,
	vdev_errlist);

	if (fnvlist_size(vdev_errlist) > 0) {
	fnvlist_add_nvlist(outnvl, ZPOOL_INITIALIZE_VDEVS,
	vdev_errlist);
	}
	fnvlist_free(vdev_errlist);

	spa_close(spa, FTAG);
	return (total_errors > 0 ? SET_ERROR(EINVAL) : 0);
	}

	/*
	* innvl: {
	* "trim_command" -> POOL_TRIM_{CANCEL\|START\|SUSPEND} (uint64)
	* "trim_vdevs": { -> guids to TRIM (nvlist)
	* "vdev_path_1": vdev_guid_1, (uint64),
	* "vdev_path_2": vdev_guid_2, (uint64),
	* ...
	* },
	* "trim_rate" -> Target TRIM rate in bytes/sec.
	* "trim_secure" -> Set to request a secure TRIM.
	* }
	*
	* outnvl: {
	* "trim_vdevs": { -> TRIM errors (nvlist)
	* "vdev_path_1": errno, see function body for possible errnos (uint64)
	* "vdev_path_2": errno, ... (uint64)
	* ...
	* }
	* }
	*
	* EINVAL is returned for an unknown commands or if any of the provided vdev
	* guids have be specified with a type other than uint64.
	*/
	static const zfs_ioc_key_t zfs_keys_pool_trim[] = {
	{ZPOOL_TRIM_COMMAND, DATA_TYPE_UINT64, 0},
	{ZPOOL_TRIM_VDEVS, DATA_TYPE_NVLIST, 0},
	{ZPOOL_TRIM_RATE, DATA_TYPE_UINT64, ZK_OPTIONAL},
	{ZPOOL_TRIM_SECURE, DATA_TYPE_BOOLEAN_VALUE, ZK_OPTIONAL},
	};

	static int
	zfs_ioc_pool_trim(const char poolname, nvlist_t innvl, nvlist_t *outnvl)
	{
	uint64_t cmd_type;
	if (nvlist_lookup_uint64(innvl, ZPOOL_TRIM_COMMAND, &cmd_type) != 0)
	return (SET_ERROR(EINVAL));

	if (!(cmd_type == POOL_TRIM_CANCEL \|\|
	cmd_type == POOL_TRIM_START \|\|
	cmd_type == POOL_TRIM_SUSPEND)) {
	return (SET_ERROR(EINVAL));
	}

	nvlist_t *vdev_guids;
	if (nvlist_lookup_nvlist(innvl, ZPOOL_TRIM_VDEVS, &vdev_guids) != 0)
	return (SET_ERROR(EINVAL));

	for (nvpair_t *pair = nvlist_next_nvpair(vdev_guids, NULL);
	pair != NULL; pair = nvlist_next_nvpair(vdev_guids, pair)) {
	uint64_t vdev_guid;
	if (nvpair_value_uint64(pair, &vdev_guid) != 0) {
	return (SET_ERROR(EINVAL));
	}
	}

	/* Optional, defaults to maximum rate when not provided */
	uint64_t rate;
	if (nvlist_lookup_uint64(innvl, ZPOOL_TRIM_RATE, &rate) != 0)
	rate = 0;

	/* Optional, defaults to standard TRIM when not provided */
	boolean_t secure;
	if (nvlist_lookup_boolean_value(innvl, ZPOOL_TRIM_SECURE,
	&secure) != 0) {
	secure = B_FALSE;
	}

	spa_t *spa;
	int error = spa_open(poolname, &spa, FTAG);
	if (error != 0)
	return (error);

	nvlist_t *vdev_errlist = fnvlist_alloc();
	int total_errors = spa_vdev_trim(spa, vdev_guids, cmd_type,
	rate, !!zfs_trim_metaslab_skip, secure, vdev_errlist);

	if (fnvlist_size(vdev_errlist) > 0)
	fnvlist_add_nvlist(outnvl, ZPOOL_TRIM_VDEVS, vdev_errlist);

	fnvlist_free(vdev_errlist);

	spa_close(spa, FTAG);
	return (total_errors > 0 ? SET_ERROR(EINVAL) : 0);
	}

	/*
	* This ioctl waits for activity of a particular type to complete. If there is
	* no activity of that type in progress, it returns immediately, and the
	* returned value "waited" is false. If there is activity in progress, and no
	* tag is passed in, the ioctl blocks until all activity of that type is
	* complete, and then returns with "waited" set to true.
	*
	* If a tag is provided, it identifies a particular instance of an activity to
	* wait for. Currently, this is only valid for use with 'initialize', because
	* that is the only activity for which there can be multiple instances running
	* concurrently. In the case of 'initialize', the tag corresponds to the guid of
	* the vdev on which to wait.
	*
	* If a thread waiting in the ioctl receives a signal, the call will return
	* immediately, and the return value will be EINTR.
	*
	* innvl: {
	* "wait_activity" -> int32_t
	* (optional) "wait_tag" -> uint64_t
	* }
	*
	* outnvl: "waited" -> boolean_t
	*/
	static const zfs_ioc_key_t zfs_keys_pool_wait[] = {
	{ZPOOL_WAIT_ACTIVITY, DATA_TYPE_INT32, 0},
	{ZPOOL_WAIT_TAG, DATA_TYPE_UINT64, ZK_OPTIONAL},
	};

	static int
	zfs_ioc_wait(const char name, nvlist_t innvl, nvlist_t *outnvl)
	{
	int32_t activity;
	uint64_t tag;
	boolean_t waited;
	int error;

	if (nvlist_lookup_int32(innvl, ZPOOL_WAIT_ACTIVITY, &activity) != 0)
	return (EINVAL);

	if (nvlist_lookup_uint64(innvl, ZPOOL_WAIT_TAG, &tag) == 0)
	error = spa_wait_tag(name, activity, tag, &waited);
	else
	error = spa_wait(name, activity, &waited);

	if (error == 0)
	fnvlist_add_boolean_value(outnvl, ZPOOL_WAIT_WAITED, waited);

	return (error);
	}

	/*
	* This ioctl waits for activity of a particular type to complete. If there is
	* no activity of that type in progress, it returns immediately, and the
	* returned value "waited" is false. If there is activity in progress, and no
	* tag is passed in, the ioctl blocks until all activity of that type is
	* complete, and then returns with "waited" set to true.
	*
	* If a thread waiting in the ioctl receives a signal, the call will return
	* immediately, and the return value will be EINTR.
	*
	* innvl: {
	* "wait_activity" -> int32_t
	* }
	*
	* outnvl: "waited" -> boolean_t
	*/
	static const zfs_ioc_key_t zfs_keys_fs_wait[] = {
	{ZFS_WAIT_ACTIVITY, DATA_TYPE_INT32, 0},
	};

	static int
	zfs_ioc_wait_fs(const char name, nvlist_t innvl, nvlist_t *outnvl)
	{
	int32_t activity;
	boolean_t waited = B_FALSE;
	int error;
	dsl_pool_t *dp;
	dsl_dir_t *dd;
	dsl_dataset_t *ds;

	if (nvlist_lookup_int32(innvl, ZFS_WAIT_ACTIVITY, &activity) != 0)
	return (SET_ERROR(EINVAL));

	if (activity >= ZFS_WAIT_NUM_ACTIVITIES \|\| activity < 0)
	return (SET_ERROR(EINVAL));

	if ((error = dsl_pool_hold(name, FTAG, &dp)) != 0)
	return (error);

	if ((error = dsl_dataset_hold(dp, name, FTAG, &ds)) != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	dd = ds->ds_dir;
	mutex_enter(&dd->dd_activity_lock);
	dd->dd_activity_waiters++;

	/*
	* We get a long-hold here so that the dsl_dataset_t and dsl_dir_t
	* aren't evicted while we're waiting. Normally this is prevented by
	* holding the pool, but we can't do that while we're waiting since
	* that would prevent TXGs from syncing out. Some of the functionality
	* of long-holds (e.g. preventing deletion) is unnecessary for this
	* case, since we would cancel the waiters before proceeding with a
	* deletion. An alternative mechanism for keeping the dataset around
	* could be developed but this is simpler.
	*/
	dsl_dataset_long_hold(ds, FTAG);
	dsl_pool_rele(dp, FTAG);

	error = dsl_dir_wait(dd, ds, activity, &waited);

	dsl_dataset_long_rele(ds, FTAG);
	dd->dd_activity_waiters--;
	if (dd->dd_activity_waiters == 0)
	cv_signal(&dd->dd_activity_cv);
	mutex_exit(&dd->dd_activity_lock);

	dsl_dataset_rele(ds, FTAG);

	if (error == 0)
	fnvlist_add_boolean_value(outnvl, ZFS_WAIT_WAITED, waited);

	return (error);
	}

	/*
	* fsname is name of dataset to rollback (to most recent snapshot)
	*
	* innvl may contain name of expected target snapshot
	*
	* outnvl: "target" -> name of most recent snapshot
	* }
	*/
	static const zfs_ioc_key_t zfs_keys_rollback[] = {
	{"target", DATA_TYPE_STRING, ZK_OPTIONAL},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_rollback(const char fsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	zfsvfs_t *zfsvfs;
	zvol_state_handle_t *zv;
	char *target = NULL;
	int error;

	(void) nvlist_lookup_string(innvl, "target", &target);
	if (target != NULL) {
	const char *cp = strchr(target, '@');

	/*
	* The snap name must contain an @, and the part after it must
	* contain only valid characters.
	*/
	if (cp == NULL \|\|
	zfs_component_namecheck(cp + 1, NULL, NULL) != 0)
	return (SET_ERROR(EINVAL));
	}

	if (getzfsvfs(fsname, &zfsvfs) == 0) {
	dsl_dataset_t *ds;

	ds = dmu_objset_ds(zfsvfs->z_os);
	error = zfs_suspend_fs(zfsvfs);
	if (error == 0) {
	int resume_err;

	error = dsl_dataset_rollback(fsname, target, zfsvfs,
	outnvl);
	resume_err = zfs_resume_fs(zfsvfs, ds);
	error = error ? error : resume_err;
	}
	zfs_vfs_rele(zfsvfs);
	} else if ((zv = zvol_suspend(fsname)) != NULL) {
	error = dsl_dataset_rollback(fsname, target, zvol_tag(zv),
	outnvl);
	zvol_resume(zv);
	} else {
	error = dsl_dataset_rollback(fsname, target, NULL, outnvl);
	}
	return (error);
	}

	static int
	recursive_unmount(const char fsname, void arg)
	{
	const char *snapname = arg;
	char *fullname;

	fullname = kmem_asprintf("%s@%s", fsname, snapname);
	zfs_unmount_snap(fullname);
	kmem_strfree(fullname);

	return (0);
	}

	/*
	*
	* snapname is the snapshot to redact.
	* innvl: {
	* "bookname" -> (string)
	* shortname of the redaction bookmark to generate
	* "snapnv" -> (nvlist, values ignored)
	* snapshots to redact snapname with respect to
	* }
	*
	* outnvl is unused
	*/

	/* ARGSUSED */
	static const zfs_ioc_key_t zfs_keys_redact[] = {
	{"bookname", DATA_TYPE_STRING, 0},
	{"snapnv", DATA_TYPE_NVLIST, 0},
	};
	static int
	zfs_ioc_redact(const char snapname, nvlist_t innvl, nvlist_t *outnvl)
	{
	nvlist_t *redactnvl = NULL;
	char *redactbook = NULL;

	if (nvlist_lookup_nvlist(innvl, "snapnv", &redactnvl) != 0)
	return (SET_ERROR(EINVAL));
	if (fnvlist_num_pairs(redactnvl) == 0)
	return (SET_ERROR(ENXIO));
	if (nvlist_lookup_string(innvl, "bookname", &redactbook) != 0)
	return (SET_ERROR(EINVAL));

	return (dmu_redact_snap(snapname, redactnvl, redactbook));
	}

	/*
	* inputs:
	* zc_name old name of dataset
	* zc_value new name of dataset
	* zc_cookie recursive flag (only valid for snapshots)
	*
	* outputs: none
	*/
	static int
	zfs_ioc_rename(zfs_cmd_t *zc)
	{
	objset_t *os;
	dmu_objset_type_t ost;
	boolean_t recursive = zc->zc_cookie & 1;
	boolean_t nounmount = !!(zc->zc_cookie & 2);
	char *at;
	int err;

	/* "zfs rename" from and to ...%recv datasets should both fail */
	zc->zc_name[sizeof (zc->zc_name) - 1] = '\0';
	zc->zc_value[sizeof (zc->zc_value) - 1] = '\0';
	if (dataset_namecheck(zc->zc_name, NULL, NULL) != 0 \|\|
	dataset_namecheck(zc->zc_value, NULL, NULL) != 0 \|\|
	strchr(zc->zc_name, '%') \|\| strchr(zc->zc_value, '%'))
	return (SET_ERROR(EINVAL));

	err = dmu_objset_hold(zc->zc_name, FTAG, &os);
	if (err != 0)
	return (err);
	ost = dmu_objset_type(os);
	dmu_objset_rele(os, FTAG);

	at = strchr(zc->zc_name, '@');
	if (at != NULL) {
	/* snaps must be in same fs */
	int error;

	if (strncmp(zc->zc_name, zc->zc_value, at - zc->zc_name + 1))
	return (SET_ERROR(EXDEV));
	*at = '\0';
	if (ost == DMU_OST_ZFS && !nounmount) {
	error = dmu_objset_find(zc->zc_name,
	recursive_unmount, at + 1,
	recursive ? DS_FIND_CHILDREN : 0);
	if (error != 0) {
	*at = '@';
	return (error);
	}
	}
	error = dsl_dataset_rename_snapshot(zc->zc_name,
	at + 1, strchr(zc->zc_value, '@') + 1, recursive);
	*at = '@';

	return (error);
	} else {
	return (dsl_dir_rename(zc->zc_name, zc->zc_value));
	}
	}

	static int
	zfs_check_settable(const char dsname, nvpair_t pair, cred_t *cr)
	{
	const char *propname = nvpair_name(pair);
	boolean_t issnap = (strchr(dsname, '@') != NULL);
	zfs_prop_t prop = zfs_name_to_prop(propname);
	uint64_t intval, compval;
	int err;

	if (prop == ZPROP_INVAL) {
	if (zfs_prop_user(propname)) {
	if ((err = zfs_secpolicy_write_perms(dsname,
	ZFS_DELEG_PERM_USERPROP, cr)))
	return (err);
	return (0);
	}

	if (!issnap && zfs_prop_userquota(propname)) {
	const char *perm = NULL;
	const char *uq_prefix =
	zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA];
	const char *gq_prefix =
	zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA];
	const char *uiq_prefix =
	zfs_userquota_prop_prefixes[ZFS_PROP_USEROBJQUOTA];
	const char *giq_prefix =
	zfs_userquota_prop_prefixes[ZFS_PROP_GROUPOBJQUOTA];
	const char *pq_prefix =
	zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTQUOTA];
	const char *piq_prefix = zfs_userquota_prop_prefixes[\
	ZFS_PROP_PROJECTOBJQUOTA];

	if (strncmp(propname, uq_prefix,
	strlen(uq_prefix)) == 0) {
	perm = ZFS_DELEG_PERM_USERQUOTA;
	} else if (strncmp(propname, uiq_prefix,
	strlen(uiq_prefix)) == 0) {
	perm = ZFS_DELEG_PERM_USEROBJQUOTA;
	} else if (strncmp(propname, gq_prefix,
	strlen(gq_prefix)) == 0) {
	perm = ZFS_DELEG_PERM_GROUPQUOTA;
	} else if (strncmp(propname, giq_prefix,
	strlen(giq_prefix)) == 0) {
	perm = ZFS_DELEG_PERM_GROUPOBJQUOTA;
	} else if (strncmp(propname, pq_prefix,
	strlen(pq_prefix)) == 0) {
	perm = ZFS_DELEG_PERM_PROJECTQUOTA;
	} else if (strncmp(propname, piq_prefix,
	strlen(piq_prefix)) == 0) {
	perm = ZFS_DELEG_PERM_PROJECTOBJQUOTA;
	} else {
	/* {USER\|GROUP\|PROJECT}USED are read-only */
	return (SET_ERROR(EINVAL));
	}

	if ((err = zfs_secpolicy_write_perms(dsname, perm, cr)))
	return (err);
	return (0);
	}

	return (SET_ERROR(EINVAL));
	}

	if (issnap)
	return (SET_ERROR(EINVAL));

	if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
	/*
	* dsl_prop_get_all_impl() returns properties in this
	* format.
	*/
	nvlist_t *attrs;
	VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
	VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
	&pair) == 0);
	}

	/*
	* Check that this value is valid for this pool version
	*/
	switch (prop) {
	case ZFS_PROP_COMPRESSION:
	/*
	* If the user specified gzip compression, make sure
	* the SPA supports it. We ignore any errors here since
	* we'll catch them later.
	*/
	if (nvpair_value_uint64(pair, &intval) == 0) {
	compval = ZIO_COMPRESS_ALGO(intval);
	if (compval >= ZIO_COMPRESS_GZIP_1 &&
	compval <= ZIO_COMPRESS_GZIP_9 &&
	zfs_earlier_version(dsname,
	SPA_VERSION_GZIP_COMPRESSION)) {
	return (SET_ERROR(ENOTSUP));
	}

	if (compval == ZIO_COMPRESS_ZLE &&
	zfs_earlier_version(dsname,
	SPA_VERSION_ZLE_COMPRESSION))
	return (SET_ERROR(ENOTSUP));

	if (compval == ZIO_COMPRESS_LZ4) {
	spa_t *spa;

	if ((err = spa_open(dsname, &spa, FTAG)) != 0)
	return (err);

	if (!spa_feature_is_enabled(spa,
	SPA_FEATURE_LZ4_COMPRESS)) {
	spa_close(spa, FTAG);
	return (SET_ERROR(ENOTSUP));
	}
	spa_close(spa, FTAG);
	}

	if (compval == ZIO_COMPRESS_ZSTD) {
	spa_t *spa;

	if ((err = spa_open(dsname, &spa, FTAG)) != 0)
	return (err);

	if (!spa_feature_is_enabled(spa,
	SPA_FEATURE_ZSTD_COMPRESS)) {
	spa_close(spa, FTAG);
	return (SET_ERROR(ENOTSUP));
	}
	spa_close(spa, FTAG);
	}
	}
	break;

	case ZFS_PROP_COPIES:
	if (zfs_earlier_version(dsname, SPA_VERSION_DITTO_BLOCKS))
	return (SET_ERROR(ENOTSUP));
	break;

	case ZFS_PROP_VOLBLOCKSIZE:
	case ZFS_PROP_RECORDSIZE:
	/* Record sizes above 128k need the feature to be enabled */
	if (nvpair_value_uint64(pair, &intval) == 0 &&
	intval > SPA_OLD_MAXBLOCKSIZE) {
	spa_t *spa;

	/*
	* We don't allow setting the property above 1MB,
	* unless the tunable has been changed.
	*/
	if (intval > zfs_max_recordsize \|\|
	intval > SPA_MAXBLOCKSIZE)
	return (SET_ERROR(ERANGE));

	if ((err = spa_open(dsname, &spa, FTAG)) != 0)
	return (err);

	if (!spa_feature_is_enabled(spa,
	SPA_FEATURE_LARGE_BLOCKS)) {
	spa_close(spa, FTAG);
	return (SET_ERROR(ENOTSUP));
	}
	spa_close(spa, FTAG);
	}
	break;

	case ZFS_PROP_DNODESIZE:
	/* Dnode sizes above 512 need the feature to be enabled */
	if (nvpair_value_uint64(pair, &intval) == 0 &&
	intval != ZFS_DNSIZE_LEGACY) {
	spa_t *spa;

	if ((err = spa_open(dsname, &spa, FTAG)) != 0)
	return (err);

	if (!spa_feature_is_enabled(spa,
	SPA_FEATURE_LARGE_DNODE)) {
	spa_close(spa, FTAG);
	return (SET_ERROR(ENOTSUP));
	}
	spa_close(spa, FTAG);
	}
	break;

	case ZFS_PROP_SPECIAL_SMALL_BLOCKS:
	/*
	* This property could require the allocation classes
	* feature to be active for setting, however we allow
	* it so that tests of settable properties succeed.
	* The CLI will issue a warning in this case.
	*/
	break;

	case ZFS_PROP_SHARESMB:
	if (zpl_earlier_version(dsname, ZPL_VERSION_FUID))
	return (SET_ERROR(ENOTSUP));
	break;

	case ZFS_PROP_ACLINHERIT:
	if (nvpair_type(pair) == DATA_TYPE_UINT64 &&
	nvpair_value_uint64(pair, &intval) == 0) {
	if (intval == ZFS_ACL_PASSTHROUGH_X &&
	zfs_earlier_version(dsname,
	SPA_VERSION_PASSTHROUGH_X))
	return (SET_ERROR(ENOTSUP));
	}
	break;
	case ZFS_PROP_CHECKSUM:
	case ZFS_PROP_DEDUP:
	{
	spa_feature_t feature;
	spa_t *spa;
	int err;

	/* dedup feature version checks */
	if (prop == ZFS_PROP_DEDUP &&
	zfs_earlier_version(dsname, SPA_VERSION_DEDUP))
	return (SET_ERROR(ENOTSUP));

	if (nvpair_type(pair) == DATA_TYPE_UINT64 &&
	nvpair_value_uint64(pair, &intval) == 0) {
	/* check prop value is enabled in features */
	feature = zio_checksum_to_feature(
	intval & ZIO_CHECKSUM_MASK);
	if (feature == SPA_FEATURE_NONE)
	break;

	if ((err = spa_open(dsname, &spa, FTAG)) != 0)
	return (err);

	if (!spa_feature_is_enabled(spa, feature)) {
	spa_close(spa, FTAG);
	return (SET_ERROR(ENOTSUP));
	}
	spa_close(spa, FTAG);
	}
	break;
	}

	default:
	break;
	}

	return (zfs_secpolicy_setprop(dsname, prop, pair, CRED()));
	}

	/*
	* Removes properties from the given props list that fail permission checks
	* needed to clear them and to restore them in case of a receive error. For each
	* property, make sure we have both set and inherit permissions.
	*
	* Returns the first error encountered if any permission checks fail. If the
	* caller provides a non-NULL errlist, it also gives the complete list of names
	* of all the properties that failed a permission check along with the
	* corresponding error numbers. The caller is responsible for freeing the
	* returned errlist.
	*
	* If every property checks out successfully, zero is returned and the list
	* pointed at by errlist is NULL.
	*/
	static int
	zfs_check_clearable(const char dataset, nvlist_t props, nvlist_t **errlist)
	{
	zfs_cmd_t *zc;
	nvpair_t pair, next_pair;
	nvlist_t *errors;
	int err, rv = 0;

	if (props == NULL)
	return (0);

	VERIFY(nvlist_alloc(&errors, NV_UNIQUE_NAME, KM_SLEEP) == 0);

	zc = kmem_alloc(sizeof (zfs_cmd_t), KM_SLEEP);
	(void) strlcpy(zc->zc_name, dataset, sizeof (zc->zc_name));
	pair = nvlist_next_nvpair(props, NULL);
	while (pair != NULL) {
	next_pair = nvlist_next_nvpair(props, pair);

	(void) strlcpy(zc->zc_value, nvpair_name(pair),
	sizeof (zc->zc_value));
	if ((err = zfs_check_settable(dataset, pair, CRED())) != 0 \|\|
	(err = zfs_secpolicy_inherit_prop(zc, NULL, CRED())) != 0) {
	VERIFY(nvlist_remove_nvpair(props, pair) == 0);
	VERIFY(nvlist_add_int32(errors,
	zc->zc_value, err) == 0);
	}
	pair = next_pair;
	}
	kmem_free(zc, sizeof (zfs_cmd_t));

	if ((pair = nvlist_next_nvpair(errors, NULL)) == NULL) {
	nvlist_free(errors);
	errors = NULL;
	} else {
	VERIFY(nvpair_value_int32(pair, &rv) == 0);
	}

	if (errlist == NULL)
	nvlist_free(errors);
	else
	*errlist = errors;

	return (rv);
	}

	static boolean_t
	propval_equals(nvpair_t p1, nvpair_t p2)
	{
	if (nvpair_type(p1) == DATA_TYPE_NVLIST) {
	/* dsl_prop_get_all_impl() format */
	nvlist_t *attrs;
	VERIFY(nvpair_value_nvlist(p1, &attrs) == 0);
	VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
	&p1) == 0);
	}

	if (nvpair_type(p2) == DATA_TYPE_NVLIST) {
	nvlist_t *attrs;
	VERIFY(nvpair_value_nvlist(p2, &attrs) == 0);
	VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
	&p2) == 0);
	}

	if (nvpair_type(p1) != nvpair_type(p2))
	return (B_FALSE);

	if (nvpair_type(p1) == DATA_TYPE_STRING) {
	char valstr1, valstr2;

	VERIFY(nvpair_value_string(p1, (char **)&valstr1) == 0);
	VERIFY(nvpair_value_string(p2, (char **)&valstr2) == 0);
	return (strcmp(valstr1, valstr2) == 0);
	} else {
	uint64_t intval1, intval2;

	VERIFY(nvpair_value_uint64(p1, &intval1) == 0);
	VERIFY(nvpair_value_uint64(p2, &intval2) == 0);
	return (intval1 == intval2);
	}
	}

	/*
	* Remove properties from props if they are not going to change (as determined
	* by comparison with origprops). Remove them from origprops as well, since we
	* do not need to clear or restore properties that won't change.
	*/
	static void
	props_reduce(nvlist_t props, nvlist_t origprops)
	{
	nvpair_t pair, next_pair;

	if (origprops == NULL)
	return; /* all props need to be received */

	pair = nvlist_next_nvpair(props, NULL);
	while (pair != NULL) {
	const char *propname = nvpair_name(pair);
	nvpair_t *match;

	next_pair = nvlist_next_nvpair(props, pair);

	if ((nvlist_lookup_nvpair(origprops, propname,
	&match) != 0) \|\| !propval_equals(pair, match))
	goto next; /* need to set received value */

	/* don't clear the existing received value */
	(void) nvlist_remove_nvpair(origprops, match);
	/* don't bother receiving the property */
	(void) nvlist_remove_nvpair(props, pair);
	next:
	pair = next_pair;
	}
	}

	/*
	* Extract properties that cannot be set PRIOR to the receipt of a dataset.
	* For example, refquota cannot be set until after the receipt of a dataset,
	* because in replication streams, an older/earlier snapshot may exceed the
	* refquota. We want to receive the older/earlier snapshot, but setting
	* refquota pre-receipt will set the dsl's ACTUAL quota, which will prevent
	* the older/earlier snapshot from being received (with EDQUOT).
	*
	* The ZFS test "zfs_receive_011_pos" demonstrates such a scenario.
	*
	* libzfs will need to be judicious handling errors encountered by props
	* extracted by this function.
	*/
	static nvlist_t *
	extract_delay_props(nvlist_t *props)
	{
	nvlist_t *delayprops;
	nvpair_t nvp, tmp;
	static const zfs_prop_t delayable[] = {
	ZFS_PROP_REFQUOTA,
	ZFS_PROP_KEYLOCATION,
	0
	};
	int i;

	VERIFY(nvlist_alloc(&delayprops, NV_UNIQUE_NAME, KM_SLEEP) == 0);

	for (nvp = nvlist_next_nvpair(props, NULL); nvp != NULL;
	nvp = nvlist_next_nvpair(props, nvp)) {
	/*
	* strcmp() is safe because zfs_prop_to_name() always returns
	* a bounded string.
	*/
	for (i = 0; delayable[i] != 0; i++) {
	if (strcmp(zfs_prop_to_name(delayable[i]),
	nvpair_name(nvp)) == 0) {
	break;
	}
	}
	if (delayable[i] != 0) {
	tmp = nvlist_prev_nvpair(props, nvp);
	VERIFY(nvlist_add_nvpair(delayprops, nvp) == 0);
	VERIFY(nvlist_remove_nvpair(props, nvp) == 0);
	nvp = tmp;
	}
	}

	if (nvlist_empty(delayprops)) {
	nvlist_free(delayprops);
	delayprops = NULL;
	}
	return (delayprops);
	}

	static void
	zfs_allow_log_destroy(void *arg)
	{
	char *poolname = arg;

	if (poolname != NULL)
	kmem_strfree(poolname);
	}

	#ifdef ZFS_DEBUG
	static boolean_t zfs_ioc_recv_inject_err;
	#endif

	/*
	* nvlist 'errors' is always allocated. It will contain descriptions of
	* encountered errors, if any. It's the callers responsibility to free.
	*/
	static int
	zfs_ioc_recv_impl(char tofs, char tosnap, char origin, nvlist_t recvprops,
	nvlist_t localprops, nvlist_t hidden_args, boolean_t force,
	boolean_t resumable, int input_fd,
	dmu_replay_record_t begin_record, uint64_t read_bytes,
	uint64_t errflags, nvlist_t *errors)
	{
	dmu_recv_cookie_t drc;
	int error = 0;
	int props_error = 0;
	offset_t off, noff;
	nvlist_t *local_delayprops = NULL;
	nvlist_t *recv_delayprops = NULL;
	nvlist_t origprops = NULL; / existing properties */
	nvlist_t origrecvd = NULL; / existing received properties */
	boolean_t first_recvd_props = B_FALSE;
	boolean_t tofs_was_redacted;
	zfs_file_t *input_fp;

	*read_bytes = 0;
	*errflags = 0;
	*errors = fnvlist_alloc();
	off = 0;

	- if ((error = zfs_file_get(input_fd, &input_fp)))
	- return (error);
	+ if ((input_fp = zfs_file_get(input_fd)) == NULL)
	+ return (SET_ERROR(EBADF));

	noff = off = zfs_file_off(input_fp);
	error = dmu_recv_begin(tofs, tosnap, begin_record, force,
	resumable, localprops, hidden_args, origin, &drc, input_fp,
	&off);
	if (error != 0)
	goto out;
	tofs_was_redacted = dsl_get_redacted(drc.drc_ds);

	/*
	* Set properties before we receive the stream so that they are applied
	* to the new data. Note that we must call dmu_recv_stream() if
	* dmu_recv_begin() succeeds.
	*/
	if (recvprops != NULL && !drc.drc_newfs) {
	if (spa_version(dsl_dataset_get_spa(drc.drc_ds)) >=
	SPA_VERSION_RECVD_PROPS &&
	!dsl_prop_get_hasrecvd(tofs))
	first_recvd_props = B_TRUE;

	/*
	* If new received properties are supplied, they are to
	* completely replace the existing received properties,
	* so stash away the existing ones.
	*/
	if (dsl_prop_get_received(tofs, &origrecvd) == 0) {
	nvlist_t *errlist = NULL;
	/*
	* Don't bother writing a property if its value won't
	* change (and avoid the unnecessary security checks).
	*
	* The first receive after SPA_VERSION_RECVD_PROPS is a
	* special case where we blow away all local properties
	* regardless.
	*/
	if (!first_recvd_props)
	props_reduce(recvprops, origrecvd);
	if (zfs_check_clearable(tofs, origrecvd, &errlist) != 0)
	(void) nvlist_merge(*errors, errlist, 0);
	nvlist_free(errlist);

	if (clear_received_props(tofs, origrecvd,
	first_recvd_props ? NULL : recvprops) != 0)
	*errflags \|= ZPROP_ERR_NOCLEAR;
	} else {
	*errflags \|= ZPROP_ERR_NOCLEAR;
	}
	}

	/*
	* Stash away existing properties so we can restore them on error unless
	* we're doing the first receive after SPA_VERSION_RECVD_PROPS, in which
	* case "origrecvd" will take care of that.
	*/
	if (localprops != NULL && !drc.drc_newfs && !first_recvd_props) {
	objset_t *os;
	if (dmu_objset_hold(tofs, FTAG, &os) == 0) {
	if (dsl_prop_get_all(os, &origprops) != 0) {
	*errflags \|= ZPROP_ERR_NOCLEAR;
	}
	dmu_objset_rele(os, FTAG);
	} else {
	*errflags \|= ZPROP_ERR_NOCLEAR;
	}
	}

	if (recvprops != NULL) {
	props_error = dsl_prop_set_hasrecvd(tofs);

	if (props_error == 0) {
	recv_delayprops = extract_delay_props(recvprops);
	(void) zfs_set_prop_nvlist(tofs, ZPROP_SRC_RECEIVED,
	recvprops, *errors);
	}
	}

	if (localprops != NULL) {
	nvlist_t *oprops = fnvlist_alloc();
	nvlist_t *xprops = fnvlist_alloc();
	nvpair_t *nvp = NULL;

	while ((nvp = nvlist_next_nvpair(localprops, nvp)) != NULL) {
	if (nvpair_type(nvp) == DATA_TYPE_BOOLEAN) {
	/* -x property */
	const char *name = nvpair_name(nvp);
	zfs_prop_t prop = zfs_name_to_prop(name);
	if (prop != ZPROP_INVAL) {
	if (!zfs_prop_inheritable(prop))
	continue;
	} else if (!zfs_prop_user(name))
	continue;
	fnvlist_add_boolean(xprops, name);
	} else {
	/* -o property=value */
	fnvlist_add_nvpair(oprops, nvp);
	}
	}

	local_delayprops = extract_delay_props(oprops);
	(void) zfs_set_prop_nvlist(tofs, ZPROP_SRC_LOCAL,
	oprops, *errors);
	(void) zfs_set_prop_nvlist(tofs, ZPROP_SRC_INHERITED,
	xprops, *errors);

	nvlist_free(oprops);
	nvlist_free(xprops);
	}

	error = dmu_recv_stream(&drc, &off);

	if (error == 0) {
	zfsvfs_t *zfsvfs = NULL;
	zvol_state_handle_t *zv = NULL;

	if (getzfsvfs(tofs, &zfsvfs) == 0) {
	/* online recv */
	dsl_dataset_t *ds;
	int end_err;
	boolean_t stream_is_redacted = DMU_GET_FEATUREFLAGS(
	begin_record->drr_u.drr_begin.
	drr_versioninfo) & DMU_BACKUP_FEATURE_REDACTED;

	ds = dmu_objset_ds(zfsvfs->z_os);
	error = zfs_suspend_fs(zfsvfs);
	/*
	* If the suspend fails, then the recv_end will
	* likely also fail, and clean up after itself.
	*/
	end_err = dmu_recv_end(&drc, zfsvfs);
	/*
	* If the dataset was not redacted, but we received a
	* redacted stream onto it, we need to unmount the
	* dataset. Otherwise, resume the filesystem.
	*/
	if (error == 0 && !drc.drc_newfs &&
	stream_is_redacted && !tofs_was_redacted) {
	error = zfs_end_fs(zfsvfs, ds);
	} else if (error == 0) {
	error = zfs_resume_fs(zfsvfs, ds);
	}
	error = error ? error : end_err;
	zfs_vfs_rele(zfsvfs);
	} else if ((zv = zvol_suspend(tofs)) != NULL) {
	error = dmu_recv_end(&drc, zvol_tag(zv));
	zvol_resume(zv);
	} else {
	error = dmu_recv_end(&drc, NULL);
	}

	/* Set delayed properties now, after we're done receiving. */
	if (recv_delayprops != NULL && error == 0) {
	(void) zfs_set_prop_nvlist(tofs, ZPROP_SRC_RECEIVED,
	recv_delayprops, *errors);
	}
	if (local_delayprops != NULL && error == 0) {
	(void) zfs_set_prop_nvlist(tofs, ZPROP_SRC_LOCAL,
	local_delayprops, *errors);
	}
	}

	/*
	* Merge delayed props back in with initial props, in case
	* we're DEBUG and zfs_ioc_recv_inject_err is set (which means
	* we have to make sure clear_received_props() includes
	* the delayed properties).
	*
	* Since zfs_ioc_recv_inject_err is only in DEBUG kernels,
	* using ASSERT() will be just like a VERIFY.
	*/
	if (recv_delayprops != NULL) {
	ASSERT(nvlist_merge(recvprops, recv_delayprops, 0) == 0);
	nvlist_free(recv_delayprops);
	}
	if (local_delayprops != NULL) {
	ASSERT(nvlist_merge(localprops, local_delayprops, 0) == 0);
	nvlist_free(local_delayprops);
	}
	*read_bytes = off - noff;

	#ifdef ZFS_DEBUG
	if (zfs_ioc_recv_inject_err) {
	zfs_ioc_recv_inject_err = B_FALSE;
	error = 1;
	}
	#endif

	/*
	* On error, restore the original props.
	*/
	if (error != 0 && recvprops != NULL && !drc.drc_newfs) {
	if (clear_received_props(tofs, recvprops, NULL) != 0) {
	/*
	* We failed to clear the received properties.
	* Since we may have left a $recvd value on the
	* system, we can't clear the $hasrecvd flag.
	*/
	*errflags \|= ZPROP_ERR_NORESTORE;
	} else if (first_recvd_props) {
	dsl_prop_unset_hasrecvd(tofs);
	}

	if (origrecvd == NULL && !drc.drc_newfs) {
	/* We failed to stash the original properties. */
	*errflags \|= ZPROP_ERR_NORESTORE;
	}

	/*
	* dsl_props_set() will not convert RECEIVED to LOCAL on or
	* after SPA_VERSION_RECVD_PROPS, so we need to specify LOCAL
	* explicitly if we're restoring local properties cleared in the
	* first new-style receive.
	*/
	if (origrecvd != NULL &&
	zfs_set_prop_nvlist(tofs, (first_recvd_props ?
	ZPROP_SRC_LOCAL : ZPROP_SRC_RECEIVED),
	origrecvd, NULL) != 0) {
	/*
	* We stashed the original properties but failed to
	* restore them.
	*/
	*errflags \|= ZPROP_ERR_NORESTORE;
	}
	}
	if (error != 0 && localprops != NULL && !drc.drc_newfs &&
	!first_recvd_props) {
	nvlist_t *setprops;
	nvlist_t *inheritprops;
	nvpair_t *nvp;

	if (origprops == NULL) {
	/* We failed to stash the original properties. */
	*errflags \|= ZPROP_ERR_NORESTORE;
	goto out;
	}

	/* Restore original props */
	setprops = fnvlist_alloc();
	inheritprops = fnvlist_alloc();
	nvp = NULL;
	while ((nvp = nvlist_next_nvpair(localprops, nvp)) != NULL) {
	const char *name = nvpair_name(nvp);
	const char *source;
	nvlist_t *attrs;

	if (!nvlist_exists(origprops, name)) {
	/*
	* Property was not present or was explicitly
	* inherited before the receive, restore this.
	*/
	fnvlist_add_boolean(inheritprops, name);
	continue;
	}
	attrs = fnvlist_lookup_nvlist(origprops, name);
	source = fnvlist_lookup_string(attrs, ZPROP_SOURCE);

	/* Skip received properties */
	if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0)
	continue;

	if (strcmp(source, tofs) == 0) {
	/* Property was locally set */
	fnvlist_add_nvlist(setprops, name, attrs);
	} else {
	/* Property was implicitly inherited */
	fnvlist_add_boolean(inheritprops, name);
	}
	}

	if (zfs_set_prop_nvlist(tofs, ZPROP_SRC_LOCAL, setprops,
	NULL) != 0)
	*errflags \|= ZPROP_ERR_NORESTORE;
	if (zfs_set_prop_nvlist(tofs, ZPROP_SRC_INHERITED, inheritprops,
	NULL) != 0)
	*errflags \|= ZPROP_ERR_NORESTORE;

	nvlist_free(setprops);
	nvlist_free(inheritprops);
	}
	out:
	- zfs_file_put(input_fd);
	+ zfs_file_put(input_fp);
	nvlist_free(origrecvd);
	nvlist_free(origprops);

	if (error == 0)
	error = props_error;

	return (error);
	}

	/*
	* inputs:
	* zc_name name of containing filesystem (unused)
	* zc_nvlist_src{_size} nvlist of properties to apply
	* zc_nvlist_conf{_size} nvlist of properties to exclude
	* (DATA_TYPE_BOOLEAN) and override (everything else)
	* zc_value name of snapshot to create
	* zc_string name of clone origin (if DRR_FLAG_CLONE)
	* zc_cookie file descriptor to recv from
	* zc_begin_record the BEGIN record of the stream (not byteswapped)
	* zc_guid force flag
	*
	* outputs:
	* zc_cookie number of bytes read
	* zc_obj zprop_errflags_t
	* zc_nvlist_dst{_size} error for each unapplied received property
	*/
	static int
	zfs_ioc_recv(zfs_cmd_t *zc)
	{
	dmu_replay_record_t begin_record;
	nvlist_t *errors = NULL;
	nvlist_t *recvdprops = NULL;
	nvlist_t *localprops = NULL;
	char *origin = NULL;
	char *tosnap;
	char tofs[ZFS_MAX_DATASET_NAME_LEN];
	int error = 0;

	if (dataset_namecheck(zc->zc_value, NULL, NULL) != 0 \|\|
	strchr(zc->zc_value, '@') == NULL \|\|
	strchr(zc->zc_value, '%'))
	return (SET_ERROR(EINVAL));

	(void) strlcpy(tofs, zc->zc_value, sizeof (tofs));
	tosnap = strchr(tofs, '@');
	*tosnap++ = '\0';

	if (zc->zc_nvlist_src != 0 &&
	(error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &recvdprops)) != 0)
	return (error);

	if (zc->zc_nvlist_conf != 0 &&
	(error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
	zc->zc_iflags, &localprops)) != 0)
	return (error);

	if (zc->zc_string[0])
	origin = zc->zc_string;

	begin_record.drr_type = DRR_BEGIN;
	begin_record.drr_payloadlen = 0;
	begin_record.drr_u.drr_begin = zc->zc_begin_record;

	error = zfs_ioc_recv_impl(tofs, tosnap, origin, recvdprops, localprops,
	NULL, zc->zc_guid, B_FALSE, zc->zc_cookie, &begin_record,
	&zc->zc_cookie, &zc->zc_obj, &errors);
	nvlist_free(recvdprops);
	nvlist_free(localprops);

	/*
	* Now that all props, initial and delayed, are set, report the prop
	* errors to the caller.
	*/
	if (zc->zc_nvlist_dst_size != 0 && errors != NULL &&
	(nvlist_smush(errors, zc->zc_nvlist_dst_size) != 0 \|\|
	put_nvlist(zc, errors) != 0)) {
	/*
	* Caller made zc->zc_nvlist_dst less than the minimum expected
	* size or supplied an invalid address.
	*/
	error = SET_ERROR(EINVAL);
	}

	nvlist_free(errors);

	return (error);
	}

	/*
	* innvl: {
	* "snapname" -> full name of the snapshot to create
	* (optional) "props" -> received properties to set (nvlist)
	* (optional) "localprops" -> override and exclude properties (nvlist)
	* (optional) "origin" -> name of clone origin (DRR_FLAG_CLONE)
	* "begin_record" -> non-byteswapped dmu_replay_record_t
	* "input_fd" -> file descriptor to read stream from (int32)
	* (optional) "force" -> force flag (value ignored)
	* (optional) "resumable" -> resumable flag (value ignored)
	* (optional) "cleanup_fd" -> unused
	* (optional) "action_handle" -> unused
	* (optional) "hidden_args" -> { "wkeydata" -> value }
	* }
	*
	* outnvl: {
	* "read_bytes" -> number of bytes read
	* "error_flags" -> zprop_errflags_t
	* "errors" -> error for each unapplied received property (nvlist)
	* }
	*/
	static const zfs_ioc_key_t zfs_keys_recv_new[] = {
	{"snapname", DATA_TYPE_STRING, 0},
	{"props", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	{"localprops", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	{"origin", DATA_TYPE_STRING, ZK_OPTIONAL},
	{"begin_record", DATA_TYPE_BYTE_ARRAY, 0},
	{"input_fd", DATA_TYPE_INT32, 0},
	{"force", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"resumable", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"cleanup_fd", DATA_TYPE_INT32, ZK_OPTIONAL},
	{"action_handle", DATA_TYPE_UINT64, ZK_OPTIONAL},
	{"hidden_args", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	};

	static int
	zfs_ioc_recv_new(const char fsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	dmu_replay_record_t *begin_record;
	uint_t begin_record_size;
	nvlist_t *errors = NULL;
	nvlist_t *recvprops = NULL;
	nvlist_t *localprops = NULL;
	nvlist_t *hidden_args = NULL;
	char *snapname;
	char *origin = NULL;
	char *tosnap;
	char tofs[ZFS_MAX_DATASET_NAME_LEN];
	boolean_t force;
	boolean_t resumable;
	uint64_t read_bytes = 0;
	uint64_t errflags = 0;
	int input_fd = -1;
	int error;

	snapname = fnvlist_lookup_string(innvl, "snapname");

	if (dataset_namecheck(snapname, NULL, NULL) != 0 \|\|
	strchr(snapname, '@') == NULL \|\|
	strchr(snapname, '%'))
	return (SET_ERROR(EINVAL));

	(void) strlcpy(tofs, snapname, sizeof (tofs));
	tosnap = strchr(tofs, '@');
	*tosnap++ = '\0';

	error = nvlist_lookup_string(innvl, "origin", &origin);
	if (error && error != ENOENT)
	return (error);

	error = nvlist_lookup_byte_array(innvl, "begin_record",
	(uchar_t **)&begin_record, &begin_record_size);
	if (error != 0 \|\| begin_record_size != sizeof (*begin_record))
	return (SET_ERROR(EINVAL));

	input_fd = fnvlist_lookup_int32(innvl, "input_fd");

	force = nvlist_exists(innvl, "force");
	resumable = nvlist_exists(innvl, "resumable");

	/* we still use "props" here for backwards compatibility */
	error = nvlist_lookup_nvlist(innvl, "props", &recvprops);
	if (error && error != ENOENT)
	return (error);

	error = nvlist_lookup_nvlist(innvl, "localprops", &localprops);
	if (error && error != ENOENT)
	return (error);

	error = nvlist_lookup_nvlist(innvl, ZPOOL_HIDDEN_ARGS, &hidden_args);
	if (error && error != ENOENT)
	return (error);

	error = zfs_ioc_recv_impl(tofs, tosnap, origin, recvprops, localprops,
	hidden_args, force, resumable, input_fd, begin_record,
	&read_bytes, &errflags, &errors);

	fnvlist_add_uint64(outnvl, "read_bytes", read_bytes);
	fnvlist_add_uint64(outnvl, "error_flags", errflags);
	fnvlist_add_nvlist(outnvl, "errors", errors);

	nvlist_free(errors);
	nvlist_free(recvprops);
	nvlist_free(localprops);

	return (error);
	}

	typedef struct dump_bytes_io {
	zfs_file_t *dbi_fp;
	caddr_t dbi_buf;
	int dbi_len;
	int dbi_err;
	} dump_bytes_io_t;

	static void
	dump_bytes_cb(void *arg)
	{
	dump_bytes_io_t dbi = (dump_bytes_io_t )arg;
	zfs_file_t *fp;
	caddr_t buf;

	fp = dbi->dbi_fp;
	buf = dbi->dbi_buf;

	dbi->dbi_err = zfs_file_write(fp, buf, dbi->dbi_len, NULL);
	}

	static int
	dump_bytes(objset_t os, void buf, int len, void *arg)
	{
	dump_bytes_io_t dbi;

	dbi.dbi_fp = arg;
	dbi.dbi_buf = buf;
	dbi.dbi_len = len;

	#if defined(HAVE_LARGE_STACKS)
	dump_bytes_cb(&dbi);
	#else
	/*
	* The vn_rdwr() call is performed in a taskq to ensure that there is
	* always enough stack space to write safely to the target filesystem.
	* The ZIO_TYPE_FREE threads are used because there can be a lot of
	* them and they are used in vdev_file.c for a similar purpose.
	*/
	spa_taskq_dispatch_sync(dmu_objset_spa(os), ZIO_TYPE_FREE,
	ZIO_TASKQ_ISSUE, dump_bytes_cb, &dbi, TQ_SLEEP);
	#endif /* HAVE_LARGE_STACKS */

	return (dbi.dbi_err);
	}

	/*
	* inputs:
	* zc_name name of snapshot to send
	* zc_cookie file descriptor to send stream to
	* zc_obj fromorigin flag (mutually exclusive with zc_fromobj)
	* zc_sendobj objsetid of snapshot to send
	* zc_fromobj objsetid of incremental fromsnap (may be zero)
	* zc_guid if set, estimate size of stream only. zc_cookie is ignored.
	* output size in zc_objset_type.
	* zc_flags lzc_send_flags
	*
	* outputs:
	* zc_objset_type estimated size, if zc_guid is set
	*
	* NOTE: This is no longer the preferred interface, any new functionality
	* should be added to zfs_ioc_send_new() instead.
	*/
	static int
	zfs_ioc_send(zfs_cmd_t *zc)
	{
	int error;
	offset_t off;
	boolean_t estimate = (zc->zc_guid != 0);
	boolean_t embedok = (zc->zc_flags & 0x1);
	boolean_t large_block_ok = (zc->zc_flags & 0x2);
	boolean_t compressok = (zc->zc_flags & 0x4);
	boolean_t rawok = (zc->zc_flags & 0x8);
	boolean_t savedok = (zc->zc_flags & 0x10);

	if (zc->zc_obj != 0) {
	dsl_pool_t *dp;
	dsl_dataset_t *tosnap;

	error = dsl_pool_hold(zc->zc_name, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold_obj(dp, zc->zc_sendobj, FTAG, &tosnap);
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	if (dsl_dir_is_clone(tosnap->ds_dir))
	zc->zc_fromobj =
	dsl_dir_phys(tosnap->ds_dir)->dd_origin_obj;
	dsl_dataset_rele(tosnap, FTAG);
	dsl_pool_rele(dp, FTAG);
	}

	if (estimate) {
	dsl_pool_t *dp;
	dsl_dataset_t *tosnap;
	dsl_dataset_t *fromsnap = NULL;

	error = dsl_pool_hold(zc->zc_name, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold_obj(dp, zc->zc_sendobj,
	FTAG, &tosnap);
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	if (zc->zc_fromobj != 0) {
	error = dsl_dataset_hold_obj(dp, zc->zc_fromobj,
	FTAG, &fromsnap);
	if (error != 0) {
	dsl_dataset_rele(tosnap, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}
	}

	error = dmu_send_estimate_fast(tosnap, fromsnap, NULL,
	compressok \|\| rawok, savedok, &zc->zc_objset_type);

	if (fromsnap != NULL)
	dsl_dataset_rele(fromsnap, FTAG);
	dsl_dataset_rele(tosnap, FTAG);
	dsl_pool_rele(dp, FTAG);
	} else {
	zfs_file_t *fp;
	dmu_send_outparams_t out = {0};

	- if ((error = zfs_file_get(zc->zc_cookie, &fp)))
	- return (error);
	+ if ((fp = zfs_file_get(zc->zc_cookie)) == NULL)
	+ return (SET_ERROR(EBADF));

	off = zfs_file_off(fp);
	out.dso_outfunc = dump_bytes;
	out.dso_arg = fp;
	out.dso_dryrun = B_FALSE;
	error = dmu_send_obj(zc->zc_name, zc->zc_sendobj,
	zc->zc_fromobj, embedok, large_block_ok, compressok,
	rawok, savedok, zc->zc_cookie, &off, &out);

	- zfs_file_put(zc->zc_cookie);
	+ zfs_file_put(fp);
	}
	return (error);
	}

	/*
	* inputs:
	* zc_name name of snapshot on which to report progress
	* zc_cookie file descriptor of send stream
	*
	* outputs:
	* zc_cookie number of bytes written in send stream thus far
	* zc_objset_type logical size of data traversed by send thus far
	*/
	static int
	zfs_ioc_send_progress(zfs_cmd_t *zc)
	{
	dsl_pool_t *dp;
	dsl_dataset_t *ds;
	dmu_sendstatus_t *dsp = NULL;
	int error;

	error = dsl_pool_hold(zc->zc_name, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold(dp, zc->zc_name, FTAG, &ds);
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	mutex_enter(&ds->ds_sendstream_lock);

	/*
	* Iterate over all the send streams currently active on this dataset.
	* If there's one which matches the specified file descriptor _and_ the
	* stream was started by the current process, return the progress of
	* that stream.
	*/

	for (dsp = list_head(&ds->ds_sendstreams); dsp != NULL;
	dsp = list_next(&ds->ds_sendstreams, dsp)) {
	if (dsp->dss_outfd == zc->zc_cookie &&
	zfs_proc_is_caller(dsp->dss_proc))
	break;
	}

	if (dsp != NULL) {
	zc->zc_cookie = atomic_cas_64((volatile uint64_t *)dsp->dss_off,
	0, 0);
	/* This is the closest thing we have to atomic_read_64. */
	zc->zc_objset_type = atomic_cas_64(&dsp->dss_blocks, 0, 0);
	} else {
	error = SET_ERROR(ENOENT);
	}

	mutex_exit(&ds->ds_sendstream_lock);
	dsl_dataset_rele(ds, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	static int
	zfs_ioc_inject_fault(zfs_cmd_t *zc)
	{
	int id, error;

	error = zio_inject_fault(zc->zc_name, (int)zc->zc_guid, &id,
	&zc->zc_inject_record);

	if (error == 0)
	zc->zc_guid = (uint64_t)id;

	return (error);
	}

	static int
	zfs_ioc_clear_fault(zfs_cmd_t *zc)
	{
	return (zio_clear_fault((int)zc->zc_guid));
	}

	static int
	zfs_ioc_inject_list_next(zfs_cmd_t *zc)
	{
	int id = (int)zc->zc_guid;
	int error;

	error = zio_inject_list_next(&id, zc->zc_name, sizeof (zc->zc_name),
	&zc->zc_inject_record);

	zc->zc_guid = id;

	return (error);
	}

	static int
	zfs_ioc_error_log(zfs_cmd_t *zc)
	{
	spa_t *spa;
	int error;
	size_t count = (size_t)zc->zc_nvlist_dst_size;

	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
	return (error);

	error = spa_get_errlog(spa, (void *)(uintptr_t)zc->zc_nvlist_dst,
	&count);
	if (error == 0)
	zc->zc_nvlist_dst_size = count;
	else
	zc->zc_nvlist_dst_size = spa_get_errlog_size(spa);

	spa_close(spa, FTAG);

	return (error);
	}

	static int
	zfs_ioc_clear(zfs_cmd_t *zc)
	{
	spa_t *spa;
	vdev_t *vd;
	int error;

	/*
	* On zpool clear we also fix up missing slogs
	*/
	mutex_enter(&spa_namespace_lock);
	spa = spa_lookup(zc->zc_name);
	if (spa == NULL) {
	mutex_exit(&spa_namespace_lock);
	return (SET_ERROR(EIO));
	}
	if (spa_get_log_state(spa) == SPA_LOG_MISSING) {
	/* we need to let spa_open/spa_load clear the chains */
	spa_set_log_state(spa, SPA_LOG_CLEAR);
	}
	spa->spa_last_open_failed = 0;
	mutex_exit(&spa_namespace_lock);

	if (zc->zc_cookie & ZPOOL_NO_REWIND) {
	error = spa_open(zc->zc_name, &spa, FTAG);
	} else {
	nvlist_t *policy;
	nvlist_t *config = NULL;

	if (zc->zc_nvlist_src == 0)
	return (SET_ERROR(EINVAL));

	if ((error = get_nvlist(zc->zc_nvlist_src,
	zc->zc_nvlist_src_size, zc->zc_iflags, &policy)) == 0) {
	error = spa_open_rewind(zc->zc_name, &spa, FTAG,
	policy, &config);
	if (config != NULL) {
	int err;

	if ((err = put_nvlist(zc, config)) != 0)
	error = err;
	nvlist_free(config);
	}
	nvlist_free(policy);
	}
	}

	if (error != 0)
	return (error);

	/*
	* If multihost is enabled, resuming I/O is unsafe as another
	* host may have imported the pool.
	*/
	if (spa_multihost(spa) && spa_suspended(spa))
	return (SET_ERROR(EINVAL));

	spa_vdev_state_enter(spa, SCL_NONE);

	if (zc->zc_guid == 0) {
	vd = NULL;
	} else {
	vd = spa_lookup_by_guid(spa, zc->zc_guid, B_TRUE);
	if (vd == NULL) {
	error = SET_ERROR(ENODEV);
	(void) spa_vdev_state_exit(spa, NULL, error);
	spa_close(spa, FTAG);
	return (error);
	}
	}

	vdev_clear(spa, vd);

	(void) spa_vdev_state_exit(spa, spa_suspended(spa) ?
	NULL : spa->spa_root_vdev, 0);

	/*
	* Resume any suspended I/Os.
	*/
	if (zio_resume(spa) != 0)
	error = SET_ERROR(EIO);

	spa_close(spa, FTAG);

	return (error);
	}

	/*
	* Reopen all the vdevs associated with the pool.
	*
	* innvl: {
	* "scrub_restart" -> when true and scrub is running, allow to restart
	* scrub as the side effect of the reopen (boolean).
	* }
	*
	* outnvl is unused
	*/
	static const zfs_ioc_key_t zfs_keys_pool_reopen[] = {
	{"scrub_restart", DATA_TYPE_BOOLEAN_VALUE, ZK_OPTIONAL},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_pool_reopen(const char pool, nvlist_t innvl, nvlist_t *outnvl)
	{
	spa_t *spa;
	int error;
	boolean_t rc, scrub_restart = B_TRUE;

	if (innvl) {
	error = nvlist_lookup_boolean_value(innvl,
	"scrub_restart", &rc);
	if (error == 0)
	scrub_restart = rc;
	}

	error = spa_open(pool, &spa, FTAG);
	if (error != 0)
	return (error);

	spa_vdev_state_enter(spa, SCL_NONE);

	/*
	* If the scrub_restart flag is B_FALSE and a scrub is already
	* in progress then set spa_scrub_reopen flag to B_TRUE so that
	* we don't restart the scrub as a side effect of the reopen.
	* Otherwise, let vdev_open() decided if a resilver is required.
	*/

	spa->spa_scrub_reopen = (!scrub_restart &&
	dsl_scan_scrubbing(spa->spa_dsl_pool));
	vdev_reopen(spa->spa_root_vdev);
	spa->spa_scrub_reopen = B_FALSE;

	(void) spa_vdev_state_exit(spa, NULL, 0);
	spa_close(spa, FTAG);
	return (0);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	*
	* outputs:
	* zc_string name of conflicting snapshot, if there is one
	*/
	static int
	zfs_ioc_promote(zfs_cmd_t *zc)
	{
	dsl_pool_t *dp;
	dsl_dataset_t ds, ods;
	char origin[ZFS_MAX_DATASET_NAME_LEN];
	char *cp;
	int error;

	zc->zc_name[sizeof (zc->zc_name) - 1] = '\0';
	if (dataset_namecheck(zc->zc_name, NULL, NULL) != 0 \|\|
	strchr(zc->zc_name, '%'))
	return (SET_ERROR(EINVAL));

	error = dsl_pool_hold(zc->zc_name, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold(dp, zc->zc_name, FTAG, &ds);
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	if (!dsl_dir_is_clone(ds->ds_dir)) {
	dsl_dataset_rele(ds, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (SET_ERROR(EINVAL));
	}

	error = dsl_dataset_hold_obj(dp,
	dsl_dir_phys(ds->ds_dir)->dd_origin_obj, FTAG, &ods);
	if (error != 0) {
	dsl_dataset_rele(ds, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	dsl_dataset_name(ods, origin);
	dsl_dataset_rele(ods, FTAG);
	dsl_dataset_rele(ds, FTAG);
	dsl_pool_rele(dp, FTAG);

	/*
	* We don't need to unmount all the origin fs's snapshots, but
	* it's easier.
	*/
	cp = strchr(origin, '@');
	if (cp)
	*cp = '\0';
	(void) dmu_objset_find(origin,
	zfs_unmount_snap_cb, NULL, DS_FIND_SNAPSHOTS);
	return (dsl_dataset_promote(zc->zc_name, zc->zc_string));
	}

	/*
	* Retrieve a single {user\|group\|project}{used\|quota}@... property.
	*
	* inputs:
	* zc_name name of filesystem
	* zc_objset_type zfs_userquota_prop_t
	* zc_value domain name (eg. "S-1-234-567-89")
	* zc_guid RID/UID/GID
	*
	* outputs:
	* zc_cookie property value
	*/
	static int
	zfs_ioc_userspace_one(zfs_cmd_t *zc)
	{
	zfsvfs_t *zfsvfs;
	int error;

	if (zc->zc_objset_type >= ZFS_NUM_USERQUOTA_PROPS)
	return (SET_ERROR(EINVAL));

	error = zfsvfs_hold(zc->zc_name, FTAG, &zfsvfs, B_FALSE);
	if (error != 0)
	return (error);

	error = zfs_userspace_one(zfsvfs,
	zc->zc_objset_type, zc->zc_value, zc->zc_guid, &zc->zc_cookie);
	zfsvfs_rele(zfsvfs, FTAG);

	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_cookie zap cursor
	* zc_objset_type zfs_userquota_prop_t
	* zc_nvlist_dst[_size] buffer to fill (not really an nvlist)
	*
	* outputs:
	* zc_nvlist_dst[_size] data buffer (array of zfs_useracct_t)
	* zc_cookie zap cursor
	*/
	static int
	zfs_ioc_userspace_many(zfs_cmd_t *zc)
	{
	zfsvfs_t *zfsvfs;
	int bufsize = zc->zc_nvlist_dst_size;

	if (bufsize <= 0)
	return (SET_ERROR(ENOMEM));

	int error = zfsvfs_hold(zc->zc_name, FTAG, &zfsvfs, B_FALSE);
	if (error != 0)
	return (error);

	void *buf = vmem_alloc(bufsize, KM_SLEEP);

	error = zfs_userspace_many(zfsvfs, zc->zc_objset_type, &zc->zc_cookie,
	buf, &zc->zc_nvlist_dst_size);

	if (error == 0) {
	error = xcopyout(buf,
	(void *)(uintptr_t)zc->zc_nvlist_dst,
	zc->zc_nvlist_dst_size);
	}
	vmem_free(buf, bufsize);
	zfsvfs_rele(zfsvfs, FTAG);

	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	*
	* outputs:
	* none
	*/
	static int
	zfs_ioc_userspace_upgrade(zfs_cmd_t *zc)
	{
	int error = 0;
	zfsvfs_t *zfsvfs;

	if (getzfsvfs(zc->zc_name, &zfsvfs) == 0) {
	if (!dmu_objset_userused_enabled(zfsvfs->z_os)) {
	/*
	* If userused is not enabled, it may be because the
	* objset needs to be closed & reopened (to grow the
	* objset_phys_t). Suspend/resume the fs will do that.
	*/
	dsl_dataset_t ds, newds;

	ds = dmu_objset_ds(zfsvfs->z_os);
	error = zfs_suspend_fs(zfsvfs);
	if (error == 0) {
	dmu_objset_refresh_ownership(ds, &newds,
	B_TRUE, zfsvfs);
	error = zfs_resume_fs(zfsvfs, newds);
	}
	}
	if (error == 0) {
	mutex_enter(&zfsvfs->z_os->os_upgrade_lock);
	if (zfsvfs->z_os->os_upgrade_id == 0) {
	/* clear potential error code and retry */
	zfsvfs->z_os->os_upgrade_status = 0;
	mutex_exit(&zfsvfs->z_os->os_upgrade_lock);

	dsl_pool_config_enter(
	dmu_objset_pool(zfsvfs->z_os), FTAG);
	dmu_objset_userspace_upgrade(zfsvfs->z_os);
	dsl_pool_config_exit(
	dmu_objset_pool(zfsvfs->z_os), FTAG);
	} else {
	mutex_exit(&zfsvfs->z_os->os_upgrade_lock);
	}

	taskq_wait_id(zfsvfs->z_os->os_spa->spa_upgrade_taskq,
	zfsvfs->z_os->os_upgrade_id);
	error = zfsvfs->z_os->os_upgrade_status;
	}
	zfs_vfs_rele(zfsvfs);
	} else {
	objset_t *os;

	/* XXX kind of reading contents without owning */
	error = dmu_objset_hold_flags(zc->zc_name, B_TRUE, FTAG, &os);
	if (error != 0)
	return (error);

	mutex_enter(&os->os_upgrade_lock);
	if (os->os_upgrade_id == 0) {
	/* clear potential error code and retry */
	os->os_upgrade_status = 0;
	mutex_exit(&os->os_upgrade_lock);

	dmu_objset_userspace_upgrade(os);
	} else {
	mutex_exit(&os->os_upgrade_lock);
	}

	dsl_pool_rele(dmu_objset_pool(os), FTAG);

	taskq_wait_id(os->os_spa->spa_upgrade_taskq, os->os_upgrade_id);
	error = os->os_upgrade_status;

	dsl_dataset_rele_flags(dmu_objset_ds(os), DS_HOLD_FLAG_DECRYPT,
	FTAG);
	}
	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	*
	* outputs:
	* none
	*/
	static int
	zfs_ioc_id_quota_upgrade(zfs_cmd_t *zc)
	{
	objset_t *os;
	int error;

	error = dmu_objset_hold_flags(zc->zc_name, B_TRUE, FTAG, &os);
	if (error != 0)
	return (error);

	if (dmu_objset_userobjspace_upgradable(os) \|\|
	dmu_objset_projectquota_upgradable(os)) {
	mutex_enter(&os->os_upgrade_lock);
	if (os->os_upgrade_id == 0) {
	/* clear potential error code and retry */
	os->os_upgrade_status = 0;
	mutex_exit(&os->os_upgrade_lock);

	dmu_objset_id_quota_upgrade(os);
	} else {
	mutex_exit(&os->os_upgrade_lock);
	}

	dsl_pool_rele(dmu_objset_pool(os), FTAG);

	taskq_wait_id(os->os_spa->spa_upgrade_taskq, os->os_upgrade_id);
	error = os->os_upgrade_status;
	} else {
	dsl_pool_rele(dmu_objset_pool(os), FTAG);
	}

	dsl_dataset_rele_flags(dmu_objset_ds(os), DS_HOLD_FLAG_DECRYPT, FTAG);

	return (error);
	}

	static int
	zfs_ioc_share(zfs_cmd_t *zc)
	{
	return (SET_ERROR(ENOSYS));
	}

	ace_t full_access[] = {
	{(uid_t)-1, ACE_ALL_PERMS, ACE_EVERYONE, 0}
	};

	/*
	* inputs:
	* zc_name name of containing filesystem
	* zc_obj object # beyond which we want next in-use object #
	*
	* outputs:
	* zc_obj next in-use object #
	*/
	static int
	zfs_ioc_next_obj(zfs_cmd_t *zc)
	{
	objset_t *os = NULL;
	int error;

	error = dmu_objset_hold(zc->zc_name, FTAG, &os);
	if (error != 0)
	return (error);

	error = dmu_object_next(os, &zc->zc_obj, B_FALSE, 0);

	dmu_objset_rele(os, FTAG);
	return (error);
	}

	/*
	* inputs:
	* zc_name name of filesystem
	* zc_value prefix name for snapshot
	* zc_cleanup_fd cleanup-on-exit file descriptor for calling process
	*
	* outputs:
	* zc_value short name of new snapshot
	*/
	static int
	zfs_ioc_tmp_snapshot(zfs_cmd_t *zc)
	{
	char *snap_name;
	char *hold_name;
	- int error;
	minor_t minor;

	- error = zfs_onexit_fd_hold(zc->zc_cleanup_fd, &minor);
	- if (error != 0)
	- return (error);
	+ zfs_file_t *fp = zfs_onexit_fd_hold(zc->zc_cleanup_fd, &minor);
	+ if (fp == NULL)
	+ return (SET_ERROR(EBADF));

	snap_name = kmem_asprintf("%s-%016llx", zc->zc_value,
	(u_longlong_t)ddi_get_lbolt64());
	hold_name = kmem_asprintf("%%%s", zc->zc_value);

	- error = dsl_dataset_snapshot_tmp(zc->zc_name, snap_name, minor,
	+ int error = dsl_dataset_snapshot_tmp(zc->zc_name, snap_name, minor,
	hold_name);
	if (error == 0)
	(void) strlcpy(zc->zc_value, snap_name,
	sizeof (zc->zc_value));
	kmem_strfree(snap_name);
	kmem_strfree(hold_name);
	- zfs_onexit_fd_rele(zc->zc_cleanup_fd);
	+ zfs_onexit_fd_rele(fp);
	return (error);
	}

	/*
	* inputs:
	* zc_name name of "to" snapshot
	* zc_value name of "from" snapshot
	* zc_cookie file descriptor to write diff data on
	*
	* outputs:
	* dmu_diff_record_t's to the file descriptor
	*/
	static int
	zfs_ioc_diff(zfs_cmd_t *zc)
	{
	zfs_file_t *fp;
	offset_t off;
	int error;

	- if ((error = zfs_file_get(zc->zc_cookie, &fp)))
	- return (error);
	+ if ((fp = zfs_file_get(zc->zc_cookie)) == NULL)
	+ return (SET_ERROR(EBADF));

	off = zfs_file_off(fp);
	error = dmu_diff(zc->zc_name, zc->zc_value, fp, &off);

	- zfs_file_put(zc->zc_cookie);
	+ zfs_file_put(fp);

	return (error);
	}

	static int
	zfs_ioc_smb_acl(zfs_cmd_t *zc)
	{
	return (SET_ERROR(ENOTSUP));
	}

	/*
	* innvl: {
	* "holds" -> { snapname -> holdname (string), ... }
	* (optional) "cleanup_fd" -> fd (int32)
	* }
	*
	* outnvl: {
	* snapname -> error value (int32)
	* ...
	* }
	*/
	static const zfs_ioc_key_t zfs_keys_hold[] = {
	{"holds", DATA_TYPE_NVLIST, 0},
	{"cleanup_fd", DATA_TYPE_INT32, ZK_OPTIONAL},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_hold(const char pool, nvlist_t args, nvlist_t *errlist)
	{
	nvpair_t *pair;
	nvlist_t *holds;
	int cleanup_fd = -1;
	int error;
	minor_t minor = 0;
	+ zfs_file_t *fp = NULL;

	holds = fnvlist_lookup_nvlist(args, "holds");

	/* make sure the user didn't pass us any invalid (empty) tags */
	for (pair = nvlist_next_nvpair(holds, NULL); pair != NULL;
	pair = nvlist_next_nvpair(holds, pair)) {
	char *htag;

	error = nvpair_value_string(pair, &htag);
	if (error != 0)
	return (SET_ERROR(error));

	if (strlen(htag) == 0)
	return (SET_ERROR(EINVAL));
	}

	if (nvlist_lookup_int32(args, "cleanup_fd", &cleanup_fd) == 0) {
	- error = zfs_onexit_fd_hold(cleanup_fd, &minor);
	- if (error != 0)
	- return (SET_ERROR(error));
	+ fp = zfs_onexit_fd_hold(cleanup_fd, &minor);
	+ if (fp == NULL)
	+ return (SET_ERROR(EBADF));
	}

	error = dsl_dataset_user_hold(holds, minor, errlist);
	- if (minor != 0)
	- zfs_onexit_fd_rele(cleanup_fd);
	+ if (fp != NULL) {
	+ ASSERT3U(minor, !=, 0);
	+ zfs_onexit_fd_rele(fp);
	+ }
	return (SET_ERROR(error));
	}

	/*
	* innvl is not used.
	*
	* outnvl: {
	* holdname -> time added (uint64 seconds since epoch)
	* ...
	* }
	*/
	static const zfs_ioc_key_t zfs_keys_get_holds[] = {
	/* no nvl keys */
	};

	/* ARGSUSED */
	static int
	zfs_ioc_get_holds(const char snapname, nvlist_t args, nvlist_t *outnvl)
	{
	return (dsl_dataset_get_holds(snapname, outnvl));
	}

	/*
	* innvl: {
	* snapname -> { holdname, ... }
	* ...
	* }
	*
	* outnvl: {
	* snapname -> error value (int32)
	* ...
	* }
	*/
	static const zfs_ioc_key_t zfs_keys_release[] = {
	{"<snapname>...", DATA_TYPE_NVLIST, ZK_WILDCARDLIST},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_release(const char pool, nvlist_t holds, nvlist_t *errlist)
	{
	return (dsl_dataset_user_release(holds, errlist));
	}

	/*
	* inputs:
	* zc_guid flags (ZEVENT_NONBLOCK)
	* zc_cleanup_fd zevent file descriptor
	*
	* outputs:
	* zc_nvlist_dst next nvlist event
	* zc_cookie dropped events since last get
	*/
	static int
	zfs_ioc_events_next(zfs_cmd_t *zc)
	{
	zfs_zevent_t *ze;
	nvlist_t *event = NULL;
	minor_t minor;
	uint64_t dropped = 0;
	int error;

	- error = zfs_zevent_fd_hold(zc->zc_cleanup_fd, &minor, &ze);
	- if (error != 0)
	- return (error);
	+ zfs_file_t *fp = zfs_zevent_fd_hold(zc->zc_cleanup_fd, &minor, &ze);
	+ if (fp == NULL)
	+ return (SET_ERROR(EBADF));

	do {
	error = zfs_zevent_next(ze, &event,
	&zc->zc_nvlist_dst_size, &dropped);
	if (event != NULL) {
	zc->zc_cookie = dropped;
	error = put_nvlist(zc, event);
	nvlist_free(event);
	}

	if (zc->zc_guid & ZEVENT_NONBLOCK)
	break;

	if ((error == 0) \|\| (error != ENOENT))
	break;

	error = zfs_zevent_wait(ze);
	if (error != 0)
	break;
	} while (1);

	- zfs_zevent_fd_rele(zc->zc_cleanup_fd);
	+ zfs_zevent_fd_rele(fp);

	return (error);
	}

	/*
	* outputs:
	* zc_cookie cleared events count
	*/
	static int
	zfs_ioc_events_clear(zfs_cmd_t *zc)
	{
	int count;

	zfs_zevent_drain_all(&count);
	zc->zc_cookie = count;

	return (0);
	}

	/*
	* inputs:
	* zc_guid eid \| ZEVENT_SEEK_START \| ZEVENT_SEEK_END
	* zc_cleanup zevent file descriptor
	*/
	static int
	zfs_ioc_events_seek(zfs_cmd_t *zc)
	{
	zfs_zevent_t *ze;
	minor_t minor;
	int error;

	- error = zfs_zevent_fd_hold(zc->zc_cleanup_fd, &minor, &ze);
	- if (error != 0)
	- return (error);
	+ zfs_file_t *fp = zfs_zevent_fd_hold(zc->zc_cleanup_fd, &minor, &ze);
	+ if (fp == NULL)
	+ return (SET_ERROR(EBADF));

	error = zfs_zevent_seek(ze, zc->zc_guid);
	- zfs_zevent_fd_rele(zc->zc_cleanup_fd);
	+ zfs_zevent_fd_rele(fp);

	return (error);
	}

	/*
	* inputs:
	* zc_name name of later filesystem or snapshot
	* zc_value full name of old snapshot or bookmark
	*
	* outputs:
	* zc_cookie space in bytes
	* zc_objset_type compressed space in bytes
	* zc_perm_action uncompressed space in bytes
	*/
	static int
	zfs_ioc_space_written(zfs_cmd_t *zc)
	{
	int error;
	dsl_pool_t *dp;
	dsl_dataset_t *new;

	error = dsl_pool_hold(zc->zc_name, FTAG, &dp);
	if (error != 0)
	return (error);
	error = dsl_dataset_hold(dp, zc->zc_name, FTAG, &new);
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}
	if (strchr(zc->zc_value, '#') != NULL) {
	zfs_bookmark_phys_t bmp;
	error = dsl_bookmark_lookup(dp, zc->zc_value,
	new, &bmp);
	if (error == 0) {
	error = dsl_dataset_space_written_bookmark(&bmp, new,
	&zc->zc_cookie,
	&zc->zc_objset_type, &zc->zc_perm_action);
	}
	} else {
	dsl_dataset_t *old;
	error = dsl_dataset_hold(dp, zc->zc_value, FTAG, &old);

	if (error == 0) {
	error = dsl_dataset_space_written(old, new,
	&zc->zc_cookie,
	&zc->zc_objset_type, &zc->zc_perm_action);
	dsl_dataset_rele(old, FTAG);
	}
	}
	dsl_dataset_rele(new, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	/*
	* innvl: {
	* "firstsnap" -> snapshot name
	* }
	*
	* outnvl: {
	* "used" -> space in bytes
	* "compressed" -> compressed space in bytes
	* "uncompressed" -> uncompressed space in bytes
	* }
	*/
	static const zfs_ioc_key_t zfs_keys_space_snaps[] = {
	{"firstsnap", DATA_TYPE_STRING, 0},
	};

	static int
	zfs_ioc_space_snaps(const char lastsnap, nvlist_t innvl, nvlist_t *outnvl)
	{
	int error;
	dsl_pool_t *dp;
	dsl_dataset_t new, old;
	char *firstsnap;
	uint64_t used, comp, uncomp;

	firstsnap = fnvlist_lookup_string(innvl, "firstsnap");

	error = dsl_pool_hold(lastsnap, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold(dp, lastsnap, FTAG, &new);
	if (error == 0 && !new->ds_is_snapshot) {
	dsl_dataset_rele(new, FTAG);
	error = SET_ERROR(EINVAL);
	}
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}
	error = dsl_dataset_hold(dp, firstsnap, FTAG, &old);
	if (error == 0 && !old->ds_is_snapshot) {
	dsl_dataset_rele(old, FTAG);
	error = SET_ERROR(EINVAL);
	}
	if (error != 0) {
	dsl_dataset_rele(new, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	error = dsl_dataset_space_wouldfree(old, new, &used, &comp, &uncomp);
	dsl_dataset_rele(old, FTAG);
	dsl_dataset_rele(new, FTAG);
	dsl_pool_rele(dp, FTAG);
	fnvlist_add_uint64(outnvl, "used", used);
	fnvlist_add_uint64(outnvl, "compressed", comp);
	fnvlist_add_uint64(outnvl, "uncompressed", uncomp);
	return (error);
	}

	/*
	* innvl: {
	* "fd" -> file descriptor to write stream to (int32)
	* (optional) "fromsnap" -> full snap name to send an incremental from
	* (optional) "largeblockok" -> (value ignored)
	* indicates that blocks > 128KB are permitted
	* (optional) "embedok" -> (value ignored)
	* presence indicates DRR_WRITE_EMBEDDED records are permitted
	* (optional) "compressok" -> (value ignored)
	* presence indicates compressed DRR_WRITE records are permitted
	* (optional) "rawok" -> (value ignored)
	* presence indicates raw encrypted records should be used.
	* (optional) "savedok" -> (value ignored)
	* presence indicates we should send a partially received snapshot
	* (optional) "resume_object" and "resume_offset" -> (uint64)
	* if present, resume send stream from specified object and offset.
	* (optional) "redactbook" -> (string)
	* if present, use this bookmark's redaction list to generate a redacted
	* send stream
	* }
	*
	* outnvl is unused
	*/
	static const zfs_ioc_key_t zfs_keys_send_new[] = {
	{"fd", DATA_TYPE_INT32, 0},
	{"fromsnap", DATA_TYPE_STRING, ZK_OPTIONAL},
	{"largeblockok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"embedok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"compressok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"rawok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"savedok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"resume_object", DATA_TYPE_UINT64, ZK_OPTIONAL},
	{"resume_offset", DATA_TYPE_UINT64, ZK_OPTIONAL},
	{"redactbook", DATA_TYPE_STRING, ZK_OPTIONAL},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_send_new(const char snapname, nvlist_t innvl, nvlist_t *outnvl)
	{
	int error;
	offset_t off;
	char *fromname = NULL;
	int fd;
	zfs_file_t *fp;
	boolean_t largeblockok;
	boolean_t embedok;
	boolean_t compressok;
	boolean_t rawok;
	boolean_t savedok;
	uint64_t resumeobj = 0;
	uint64_t resumeoff = 0;
	char *redactbook = NULL;

	fd = fnvlist_lookup_int32(innvl, "fd");

	(void) nvlist_lookup_string(innvl, "fromsnap", &fromname);

	largeblockok = nvlist_exists(innvl, "largeblockok");
	embedok = nvlist_exists(innvl, "embedok");
	compressok = nvlist_exists(innvl, "compressok");
	rawok = nvlist_exists(innvl, "rawok");
	savedok = nvlist_exists(innvl, "savedok");

	(void) nvlist_lookup_uint64(innvl, "resume_object", &resumeobj);
	(void) nvlist_lookup_uint64(innvl, "resume_offset", &resumeoff);

	(void) nvlist_lookup_string(innvl, "redactbook", &redactbook);

	- if ((error = zfs_file_get(fd, &fp)))
	- return (error);
	+ if ((fp = zfs_file_get(fd)) == NULL)
	+ return (SET_ERROR(EBADF));

	off = zfs_file_off(fp);

	dmu_send_outparams_t out = {0};
	out.dso_outfunc = dump_bytes;
	out.dso_arg = fp;
	out.dso_dryrun = B_FALSE;
	error = dmu_send(snapname, fromname, embedok, largeblockok,
	compressok, rawok, savedok, resumeobj, resumeoff,
	redactbook, fd, &off, &out);

	- zfs_file_put(fd);
	+ zfs_file_put(fp);
	return (error);
	}

	/* ARGSUSED */
	static int
	send_space_sum(objset_t os, void buf, int len, void *arg)
	{
	uint64_t *size = arg;
	*size += len;
	return (0);
	}

	/*
	* Determine approximately how large a zfs send stream will be -- the number
	* of bytes that will be written to the fd supplied to zfs_ioc_send_new().
	*
	* innvl: {
	* (optional) "from" -> full snap or bookmark name to send an incremental
	* from
	* (optional) "largeblockok" -> (value ignored)
	* indicates that blocks > 128KB are permitted
	* (optional) "embedok" -> (value ignored)
	* presence indicates DRR_WRITE_EMBEDDED records are permitted
	* (optional) "compressok" -> (value ignored)
	* presence indicates compressed DRR_WRITE records are permitted
	* (optional) "rawok" -> (value ignored)
	* presence indicates raw encrypted records should be used.
	* (optional) "resume_object" and "resume_offset" -> (uint64)
	* if present, resume send stream from specified object and offset.
	* (optional) "fd" -> file descriptor to use as a cookie for progress
	* tracking (int32)
	* }
	*
	* outnvl: {
	* "space" -> bytes of space (uint64)
	* }
	*/
	static const zfs_ioc_key_t zfs_keys_send_space[] = {
	{"from", DATA_TYPE_STRING, ZK_OPTIONAL},
	{"fromsnap", DATA_TYPE_STRING, ZK_OPTIONAL},
	{"largeblockok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"embedok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"compressok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"rawok", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	{"fd", DATA_TYPE_INT32, ZK_OPTIONAL},
	{"redactbook", DATA_TYPE_STRING, ZK_OPTIONAL},
	{"resume_object", DATA_TYPE_UINT64, ZK_OPTIONAL},
	{"resume_offset", DATA_TYPE_UINT64, ZK_OPTIONAL},
	{"bytes", DATA_TYPE_UINT64, ZK_OPTIONAL},
	};

	static int
	zfs_ioc_send_space(const char snapname, nvlist_t innvl, nvlist_t *outnvl)
	{
	dsl_pool_t *dp;
	dsl_dataset_t *tosnap;
	dsl_dataset_t *fromsnap = NULL;
	int error;
	char *fromname = NULL;
	char *redactlist_book = NULL;
	boolean_t largeblockok;
	boolean_t embedok;
	boolean_t compressok;
	boolean_t rawok;
	boolean_t savedok;
	uint64_t space = 0;
	boolean_t full_estimate = B_FALSE;
	uint64_t resumeobj = 0;
	uint64_t resumeoff = 0;
	uint64_t resume_bytes = 0;
	int32_t fd = -1;
	zfs_bookmark_phys_t zbm = {0};

	error = dsl_pool_hold(snapname, FTAG, &dp);
	if (error != 0)
	return (error);

	error = dsl_dataset_hold(dp, snapname, FTAG, &tosnap);
	if (error != 0) {
	dsl_pool_rele(dp, FTAG);
	return (error);
	}
	(void) nvlist_lookup_int32(innvl, "fd", &fd);

	largeblockok = nvlist_exists(innvl, "largeblockok");
	embedok = nvlist_exists(innvl, "embedok");
	compressok = nvlist_exists(innvl, "compressok");
	rawok = nvlist_exists(innvl, "rawok");
	savedok = nvlist_exists(innvl, "savedok");
	boolean_t from = (nvlist_lookup_string(innvl, "from", &fromname) == 0);
	boolean_t altbook = (nvlist_lookup_string(innvl, "redactbook",
	&redactlist_book) == 0);

	(void) nvlist_lookup_uint64(innvl, "resume_object", &resumeobj);
	(void) nvlist_lookup_uint64(innvl, "resume_offset", &resumeoff);
	(void) nvlist_lookup_uint64(innvl, "bytes", &resume_bytes);

	if (altbook) {
	full_estimate = B_TRUE;
	} else if (from) {
	if (strchr(fromname, '#')) {
	error = dsl_bookmark_lookup(dp, fromname, tosnap, &zbm);

	/*
	* dsl_bookmark_lookup() will fail with EXDEV if
	* the from-bookmark and tosnap are at the same txg.
	* However, it's valid to do a send (and therefore,
	* a send estimate) from and to the same time point,
	* if the bookmark is redacted (the incremental send
	* can change what's redacted on the target). In
	* this case, dsl_bookmark_lookup() fills in zbm
	* but returns EXDEV. Ignore this error.
	*/
	if (error == EXDEV && zbm.zbm_redaction_obj != 0 &&
	zbm.zbm_guid ==
	dsl_dataset_phys(tosnap)->ds_guid)
	error = 0;

	if (error != 0) {
	dsl_dataset_rele(tosnap, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}
	if (zbm.zbm_redaction_obj != 0 \|\| !(zbm.zbm_flags &
	ZBM_FLAG_HAS_FBN)) {
	full_estimate = B_TRUE;
	}
	} else if (strchr(fromname, '@')) {
	error = dsl_dataset_hold(dp, fromname, FTAG, &fromsnap);
	if (error != 0) {
	dsl_dataset_rele(tosnap, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (error);
	}

	if (!dsl_dataset_is_before(tosnap, fromsnap, 0)) {
	full_estimate = B_TRUE;
	dsl_dataset_rele(fromsnap, FTAG);
	}
	} else {
	/*
	* from is not properly formatted as a snapshot or
	* bookmark
	*/
	dsl_dataset_rele(tosnap, FTAG);
	dsl_pool_rele(dp, FTAG);
	return (SET_ERROR(EINVAL));
	}
	}

	if (full_estimate) {
	dmu_send_outparams_t out = {0};
	offset_t off = 0;
	out.dso_outfunc = send_space_sum;
	out.dso_arg = &space;
	out.dso_dryrun = B_TRUE;
	/*
	* We have to release these holds so dmu_send can take them. It
	* will do all the error checking we need.
	*/
	dsl_dataset_rele(tosnap, FTAG);
	dsl_pool_rele(dp, FTAG);
	error = dmu_send(snapname, fromname, embedok, largeblockok,
	compressok, rawok, savedok, resumeobj, resumeoff,
	redactlist_book, fd, &off, &out);
	} else {
	error = dmu_send_estimate_fast(tosnap, fromsnap,
	(from && strchr(fromname, '#') != NULL ? &zbm : NULL),
	compressok \|\| rawok, savedok, &space);
	space -= resume_bytes;
	if (fromsnap != NULL)
	dsl_dataset_rele(fromsnap, FTAG);
	dsl_dataset_rele(tosnap, FTAG);
	dsl_pool_rele(dp, FTAG);
	}

	fnvlist_add_uint64(outnvl, "space", space);

	return (error);
	}

	/*
	* Sync the currently open TXG to disk for the specified pool.
	* This is somewhat similar to 'zfs_sync()'.
	* For cases that do not result in error this ioctl will wait for
	* the currently open TXG to commit before returning back to the caller.
	*
	* innvl: {
	* "force" -> when true, force uberblock update even if there is no dirty data.
	* In addition this will cause the vdev configuration to be written
	* out including updating the zpool cache file. (boolean_t)
	* }
	*
	* onvl is unused
	*/
	static const zfs_ioc_key_t zfs_keys_pool_sync[] = {
	{"force", DATA_TYPE_BOOLEAN_VALUE, 0},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_pool_sync(const char pool, nvlist_t innvl, nvlist_t *onvl)
	{
	int err;
	boolean_t rc, force = B_FALSE;
	spa_t *spa;

	if ((err = spa_open(pool, &spa, FTAG)) != 0)
	return (err);

	if (innvl) {
	err = nvlist_lookup_boolean_value(innvl, "force", &rc);
	if (err == 0)
	force = rc;
	}

	if (force) {
	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_WRITER);
	vdev_config_dirty(spa->spa_root_vdev);
	spa_config_exit(spa, SCL_CONFIG, FTAG);
	}
	txg_wait_synced(spa_get_dsl(spa), 0);

	spa_close(spa, FTAG);

	return (0);
	}

	/*
	* Load a user's wrapping key into the kernel.
	* innvl: {
	* "hidden_args" -> { "wkeydata" -> value }
	* raw uint8_t array of encryption wrapping key data (32 bytes)
	* (optional) "noop" -> (value ignored)
	* presence indicated key should only be verified, not loaded
	* }
	*/
	static const zfs_ioc_key_t zfs_keys_load_key[] = {
	{"hidden_args", DATA_TYPE_NVLIST, 0},
	{"noop", DATA_TYPE_BOOLEAN, ZK_OPTIONAL},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_load_key(const char dsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	int ret;
	dsl_crypto_params_t *dcp = NULL;
	nvlist_t *hidden_args;
	boolean_t noop = nvlist_exists(innvl, "noop");

	if (strchr(dsname, '@') != NULL \|\| strchr(dsname, '%') != NULL) {
	ret = SET_ERROR(EINVAL);
	goto error;
	}

	hidden_args = fnvlist_lookup_nvlist(innvl, ZPOOL_HIDDEN_ARGS);

	ret = dsl_crypto_params_create_nvlist(DCP_CMD_NONE, NULL,
	hidden_args, &dcp);
	if (ret != 0)
	goto error;

	ret = spa_keystore_load_wkey(dsname, dcp, noop);
	if (ret != 0)
	goto error;

	dsl_crypto_params_free(dcp, noop);

	return (0);

	error:
	dsl_crypto_params_free(dcp, B_TRUE);
	return (ret);
	}

	/*
	* Unload a user's wrapping key from the kernel.
	* Both innvl and outnvl are unused.
	*/
	static const zfs_ioc_key_t zfs_keys_unload_key[] = {
	/* no nvl keys */
	};

	/* ARGSUSED */
	static int
	zfs_ioc_unload_key(const char dsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	int ret = 0;

	if (strchr(dsname, '@') != NULL \|\| strchr(dsname, '%') != NULL) {
	ret = (SET_ERROR(EINVAL));
	goto out;
	}

	ret = spa_keystore_unload_wkey(dsname);
	if (ret != 0)
	goto out;

	out:
	return (ret);
	}

	/*
	* Changes a user's wrapping key used to decrypt a dataset. The keyformat,
	* keylocation, pbkdf2salt, and pbkdf2iters properties can also be specified
	* here to change how the key is derived in userspace.
	*
	* innvl: {
	* "hidden_args" (optional) -> { "wkeydata" -> value }
	* raw uint8_t array of new encryption wrapping key data (32 bytes)
	* "props" (optional) -> { prop -> value }
	* }
	*
	* outnvl is unused
	*/
	static const zfs_ioc_key_t zfs_keys_change_key[] = {
	{"crypt_cmd", DATA_TYPE_UINT64, ZK_OPTIONAL},
	{"hidden_args", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	{"props", DATA_TYPE_NVLIST, ZK_OPTIONAL},
	};

	/* ARGSUSED */
	static int
	zfs_ioc_change_key(const char dsname, nvlist_t innvl, nvlist_t *outnvl)
	{
	int ret;
	uint64_t cmd = DCP_CMD_NONE;
	dsl_crypto_params_t *dcp = NULL;
	nvlist_t args = NULL, hidden_args = NULL;

	if (strchr(dsname, '@') != NULL \|\| strchr(dsname, '%') != NULL) {
	ret = (SET_ERROR(EINVAL));
	goto error;
	}

	(void) nvlist_lookup_uint64(innvl, "crypt_cmd", &cmd);
	(void) nvlist_lookup_nvlist(innvl, "props", &args);
	(void) nvlist_lookup_nvlist(innvl, ZPOOL_HIDDEN_ARGS, &hidden_args);

	ret = dsl_crypto_params_create_nvlist(cmd, args, hidden_args, &dcp);
	if (ret != 0)
	goto error;

	ret = spa_keystore_change_key(dsname, dcp);
	if (ret != 0)
	goto error;

	dsl_crypto_params_free(dcp, B_FALSE);

	return (0);

	error:
	dsl_crypto_params_free(dcp, B_TRUE);
	return (ret);
	}

	static zfs_ioc_vec_t zfs_ioc_vec[ZFS_IOC_LAST - ZFS_IOC_FIRST];

	static void
	zfs_ioctl_register_legacy(zfs_ioc_t ioc, zfs_ioc_legacy_func_t *func,
	zfs_secpolicy_func_t *secpolicy, zfs_ioc_namecheck_t namecheck,
	boolean_t log_history, zfs_ioc_poolcheck_t pool_check)
	{
	zfs_ioc_vec_t *vec = &zfs_ioc_vec[ioc - ZFS_IOC_FIRST];

	ASSERT3U(ioc, >=, ZFS_IOC_FIRST);
	ASSERT3U(ioc, <, ZFS_IOC_LAST);
	ASSERT3P(vec->zvec_legacy_func, ==, NULL);
	ASSERT3P(vec->zvec_func, ==, NULL);

	vec->zvec_legacy_func = func;
	vec->zvec_secpolicy = secpolicy;
	vec->zvec_namecheck = namecheck;
	vec->zvec_allow_log = log_history;
	vec->zvec_pool_check = pool_check;
	}

	/*
	* See the block comment at the beginning of this file for details on
	* each argument to this function.
	*/
	void
	zfs_ioctl_register(const char name, zfs_ioc_t ioc, zfs_ioc_func_t func,
	zfs_secpolicy_func_t *secpolicy, zfs_ioc_namecheck_t namecheck,
	zfs_ioc_poolcheck_t pool_check, boolean_t smush_outnvlist,
	boolean_t allow_log, const zfs_ioc_key_t *nvl_keys, size_t num_keys)
	{
	zfs_ioc_vec_t *vec = &zfs_ioc_vec[ioc - ZFS_IOC_FIRST];

	ASSERT3U(ioc, >=, ZFS_IOC_FIRST);
	ASSERT3U(ioc, <, ZFS_IOC_LAST);
	ASSERT3P(vec->zvec_legacy_func, ==, NULL);
	ASSERT3P(vec->zvec_func, ==, NULL);

	/* if we are logging, the name must be valid */
	ASSERT(!allow_log \|\| namecheck != NO_NAME);

	vec->zvec_name = name;
	vec->zvec_func = func;
	vec->zvec_secpolicy = secpolicy;
	vec->zvec_namecheck = namecheck;
	vec->zvec_pool_check = pool_check;
	vec->zvec_smush_outnvlist = smush_outnvlist;
	vec->zvec_allow_log = allow_log;
	vec->zvec_nvl_keys = nvl_keys;
	vec->zvec_nvl_key_count = num_keys;
	}

	static void
	zfs_ioctl_register_pool(zfs_ioc_t ioc, zfs_ioc_legacy_func_t *func,
	zfs_secpolicy_func_t *secpolicy, boolean_t log_history,
	zfs_ioc_poolcheck_t pool_check)
	{
	zfs_ioctl_register_legacy(ioc, func, secpolicy,
	POOL_NAME, log_history, pool_check);
	}

	void
	zfs_ioctl_register_dataset_nolog(zfs_ioc_t ioc, zfs_ioc_legacy_func_t *func,
	zfs_secpolicy_func_t *secpolicy, zfs_ioc_poolcheck_t pool_check)
	{
	zfs_ioctl_register_legacy(ioc, func, secpolicy,
	DATASET_NAME, B_FALSE, pool_check);
	}

	static void
	zfs_ioctl_register_pool_modify(zfs_ioc_t ioc, zfs_ioc_legacy_func_t *func)
	{
	zfs_ioctl_register_legacy(ioc, func, zfs_secpolicy_config,
	POOL_NAME, B_TRUE, POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY);
	}

	static void
	zfs_ioctl_register_pool_meta(zfs_ioc_t ioc, zfs_ioc_legacy_func_t *func,
	zfs_secpolicy_func_t *secpolicy)
	{
	zfs_ioctl_register_legacy(ioc, func, secpolicy,
	NO_NAME, B_FALSE, POOL_CHECK_NONE);
	}

	static void
	zfs_ioctl_register_dataset_read_secpolicy(zfs_ioc_t ioc,
	zfs_ioc_legacy_func_t func, zfs_secpolicy_func_t secpolicy)
	{
	zfs_ioctl_register_legacy(ioc, func, secpolicy,
	DATASET_NAME, B_FALSE, POOL_CHECK_SUSPENDED);
	}

	static void
	zfs_ioctl_register_dataset_read(zfs_ioc_t ioc, zfs_ioc_legacy_func_t *func)
	{
	zfs_ioctl_register_dataset_read_secpolicy(ioc, func,
	zfs_secpolicy_read);
	}

	static void
	zfs_ioctl_register_dataset_modify(zfs_ioc_t ioc, zfs_ioc_legacy_func_t *func,
	zfs_secpolicy_func_t *secpolicy)
	{
	zfs_ioctl_register_legacy(ioc, func, secpolicy,
	DATASET_NAME, B_TRUE, POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY);
	}

	static void
	zfs_ioctl_init(void)
	{
	zfs_ioctl_register("snapshot", ZFS_IOC_SNAPSHOT,
	zfs_ioc_snapshot, zfs_secpolicy_snapshot, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_snapshot, ARRAY_SIZE(zfs_keys_snapshot));

	zfs_ioctl_register("log_history", ZFS_IOC_LOG_HISTORY,
	zfs_ioc_log_history, zfs_secpolicy_log_history, NO_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_FALSE, B_FALSE,
	zfs_keys_log_history, ARRAY_SIZE(zfs_keys_log_history));

	zfs_ioctl_register("space_snaps", ZFS_IOC_SPACE_SNAPS,
	zfs_ioc_space_snaps, zfs_secpolicy_read, DATASET_NAME,
	POOL_CHECK_SUSPENDED, B_FALSE, B_FALSE,
	zfs_keys_space_snaps, ARRAY_SIZE(zfs_keys_space_snaps));

	zfs_ioctl_register("send", ZFS_IOC_SEND_NEW,
	zfs_ioc_send_new, zfs_secpolicy_send_new, DATASET_NAME,
	POOL_CHECK_SUSPENDED, B_FALSE, B_FALSE,
	zfs_keys_send_new, ARRAY_SIZE(zfs_keys_send_new));

	zfs_ioctl_register("send_space", ZFS_IOC_SEND_SPACE,
	zfs_ioc_send_space, zfs_secpolicy_read, DATASET_NAME,
	POOL_CHECK_SUSPENDED, B_FALSE, B_FALSE,
	zfs_keys_send_space, ARRAY_SIZE(zfs_keys_send_space));

	zfs_ioctl_register("create", ZFS_IOC_CREATE,
	zfs_ioc_create, zfs_secpolicy_create_clone, DATASET_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_create, ARRAY_SIZE(zfs_keys_create));

	zfs_ioctl_register("clone", ZFS_IOC_CLONE,
	zfs_ioc_clone, zfs_secpolicy_create_clone, DATASET_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_clone, ARRAY_SIZE(zfs_keys_clone));

	zfs_ioctl_register("remap", ZFS_IOC_REMAP,
	zfs_ioc_remap, zfs_secpolicy_none, DATASET_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_FALSE, B_TRUE,
	zfs_keys_remap, ARRAY_SIZE(zfs_keys_remap));

	zfs_ioctl_register("destroy_snaps", ZFS_IOC_DESTROY_SNAPS,
	zfs_ioc_destroy_snaps, zfs_secpolicy_destroy_snaps, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_destroy_snaps, ARRAY_SIZE(zfs_keys_destroy_snaps));

	zfs_ioctl_register("hold", ZFS_IOC_HOLD,
	zfs_ioc_hold, zfs_secpolicy_hold, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_hold, ARRAY_SIZE(zfs_keys_hold));
	zfs_ioctl_register("release", ZFS_IOC_RELEASE,
	zfs_ioc_release, zfs_secpolicy_release, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_release, ARRAY_SIZE(zfs_keys_release));

	zfs_ioctl_register("get_holds", ZFS_IOC_GET_HOLDS,
	zfs_ioc_get_holds, zfs_secpolicy_read, DATASET_NAME,
	POOL_CHECK_SUSPENDED, B_FALSE, B_FALSE,
	zfs_keys_get_holds, ARRAY_SIZE(zfs_keys_get_holds));

	zfs_ioctl_register("rollback", ZFS_IOC_ROLLBACK,
	zfs_ioc_rollback, zfs_secpolicy_rollback, DATASET_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_FALSE, B_TRUE,
	zfs_keys_rollback, ARRAY_SIZE(zfs_keys_rollback));

	zfs_ioctl_register("bookmark", ZFS_IOC_BOOKMARK,
	zfs_ioc_bookmark, zfs_secpolicy_bookmark, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_bookmark, ARRAY_SIZE(zfs_keys_bookmark));

	zfs_ioctl_register("get_bookmarks", ZFS_IOC_GET_BOOKMARKS,
	zfs_ioc_get_bookmarks, zfs_secpolicy_read, DATASET_NAME,
	POOL_CHECK_SUSPENDED, B_FALSE, B_FALSE,
	zfs_keys_get_bookmarks, ARRAY_SIZE(zfs_keys_get_bookmarks));

	zfs_ioctl_register("get_bookmark_props", ZFS_IOC_GET_BOOKMARK_PROPS,
	zfs_ioc_get_bookmark_props, zfs_secpolicy_read, ENTITY_NAME,
	POOL_CHECK_SUSPENDED, B_FALSE, B_FALSE, zfs_keys_get_bookmark_props,
	ARRAY_SIZE(zfs_keys_get_bookmark_props));

	zfs_ioctl_register("destroy_bookmarks", ZFS_IOC_DESTROY_BOOKMARKS,
	zfs_ioc_destroy_bookmarks, zfs_secpolicy_destroy_bookmarks,
	POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_destroy_bookmarks,
	ARRAY_SIZE(zfs_keys_destroy_bookmarks));

	zfs_ioctl_register("receive", ZFS_IOC_RECV_NEW,
	zfs_ioc_recv_new, zfs_secpolicy_recv_new, DATASET_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_recv_new, ARRAY_SIZE(zfs_keys_recv_new));
	zfs_ioctl_register("load-key", ZFS_IOC_LOAD_KEY,
	zfs_ioc_load_key, zfs_secpolicy_load_key,
	DATASET_NAME, POOL_CHECK_SUSPENDED, B_TRUE, B_TRUE,
	zfs_keys_load_key, ARRAY_SIZE(zfs_keys_load_key));
	zfs_ioctl_register("unload-key", ZFS_IOC_UNLOAD_KEY,
	zfs_ioc_unload_key, zfs_secpolicy_load_key,
	DATASET_NAME, POOL_CHECK_SUSPENDED, B_TRUE, B_TRUE,
	zfs_keys_unload_key, ARRAY_SIZE(zfs_keys_unload_key));
	zfs_ioctl_register("change-key", ZFS_IOC_CHANGE_KEY,
	zfs_ioc_change_key, zfs_secpolicy_change_key,
	DATASET_NAME, POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY,
	B_TRUE, B_TRUE, zfs_keys_change_key,
	ARRAY_SIZE(zfs_keys_change_key));

	zfs_ioctl_register("sync", ZFS_IOC_POOL_SYNC,
	zfs_ioc_pool_sync, zfs_secpolicy_none, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_FALSE, B_FALSE,
	zfs_keys_pool_sync, ARRAY_SIZE(zfs_keys_pool_sync));
	zfs_ioctl_register("reopen", ZFS_IOC_POOL_REOPEN, zfs_ioc_pool_reopen,
	zfs_secpolicy_config, POOL_NAME, POOL_CHECK_SUSPENDED, B_TRUE,
	B_TRUE, zfs_keys_pool_reopen, ARRAY_SIZE(zfs_keys_pool_reopen));

	zfs_ioctl_register("channel_program", ZFS_IOC_CHANNEL_PROGRAM,
	zfs_ioc_channel_program, zfs_secpolicy_config,
	POOL_NAME, POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE,
	B_TRUE, zfs_keys_channel_program,
	ARRAY_SIZE(zfs_keys_channel_program));

	zfs_ioctl_register("redact", ZFS_IOC_REDACT,
	zfs_ioc_redact, zfs_secpolicy_config, DATASET_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_redact, ARRAY_SIZE(zfs_keys_redact));

	zfs_ioctl_register("zpool_checkpoint", ZFS_IOC_POOL_CHECKPOINT,
	zfs_ioc_pool_checkpoint, zfs_secpolicy_config, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_pool_checkpoint, ARRAY_SIZE(zfs_keys_pool_checkpoint));

	zfs_ioctl_register("zpool_discard_checkpoint",
	ZFS_IOC_POOL_DISCARD_CHECKPOINT, zfs_ioc_pool_discard_checkpoint,
	zfs_secpolicy_config, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_pool_discard_checkpoint,
	ARRAY_SIZE(zfs_keys_pool_discard_checkpoint));

	zfs_ioctl_register("initialize", ZFS_IOC_POOL_INITIALIZE,
	zfs_ioc_pool_initialize, zfs_secpolicy_config, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_pool_initialize, ARRAY_SIZE(zfs_keys_pool_initialize));

	zfs_ioctl_register("trim", ZFS_IOC_POOL_TRIM,
	zfs_ioc_pool_trim, zfs_secpolicy_config, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_TRUE, B_TRUE,
	zfs_keys_pool_trim, ARRAY_SIZE(zfs_keys_pool_trim));

	zfs_ioctl_register("wait", ZFS_IOC_WAIT,
	zfs_ioc_wait, zfs_secpolicy_none, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_FALSE, B_FALSE,
	zfs_keys_pool_wait, ARRAY_SIZE(zfs_keys_pool_wait));

	zfs_ioctl_register("wait_fs", ZFS_IOC_WAIT_FS,
	zfs_ioc_wait_fs, zfs_secpolicy_none, DATASET_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_FALSE, B_FALSE,
	zfs_keys_fs_wait, ARRAY_SIZE(zfs_keys_fs_wait));

	zfs_ioctl_register("set_bootenv", ZFS_IOC_SET_BOOTENV,
	zfs_ioc_set_bootenv, zfs_secpolicy_config, POOL_NAME,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY, B_FALSE, B_TRUE,
	zfs_keys_set_bootenv, ARRAY_SIZE(zfs_keys_set_bootenv));

	zfs_ioctl_register("get_bootenv", ZFS_IOC_GET_BOOTENV,
	zfs_ioc_get_bootenv, zfs_secpolicy_none, POOL_NAME,
	POOL_CHECK_SUSPENDED, B_FALSE, B_TRUE,
	zfs_keys_get_bootenv, ARRAY_SIZE(zfs_keys_get_bootenv));

	/* IOCTLS that use the legacy function signature */

	zfs_ioctl_register_legacy(ZFS_IOC_POOL_FREEZE, zfs_ioc_pool_freeze,
	zfs_secpolicy_config, NO_NAME, B_FALSE, POOL_CHECK_READONLY);

	zfs_ioctl_register_pool(ZFS_IOC_POOL_CREATE, zfs_ioc_pool_create,
	zfs_secpolicy_config, B_TRUE, POOL_CHECK_NONE);
	zfs_ioctl_register_pool_modify(ZFS_IOC_POOL_SCAN,
	zfs_ioc_pool_scan);
	zfs_ioctl_register_pool_modify(ZFS_IOC_POOL_UPGRADE,
	zfs_ioc_pool_upgrade);
	zfs_ioctl_register_pool_modify(ZFS_IOC_VDEV_ADD,
	zfs_ioc_vdev_add);
	zfs_ioctl_register_pool_modify(ZFS_IOC_VDEV_REMOVE,
	zfs_ioc_vdev_remove);
	zfs_ioctl_register_pool_modify(ZFS_IOC_VDEV_SET_STATE,
	zfs_ioc_vdev_set_state);
	zfs_ioctl_register_pool_modify(ZFS_IOC_VDEV_ATTACH,
	zfs_ioc_vdev_attach);
	zfs_ioctl_register_pool_modify(ZFS_IOC_VDEV_DETACH,
	zfs_ioc_vdev_detach);
	zfs_ioctl_register_pool_modify(ZFS_IOC_VDEV_SETPATH,
	zfs_ioc_vdev_setpath);
	zfs_ioctl_register_pool_modify(ZFS_IOC_VDEV_SETFRU,
	zfs_ioc_vdev_setfru);
	zfs_ioctl_register_pool_modify(ZFS_IOC_POOL_SET_PROPS,
	zfs_ioc_pool_set_props);
	zfs_ioctl_register_pool_modify(ZFS_IOC_VDEV_SPLIT,
	zfs_ioc_vdev_split);
	zfs_ioctl_register_pool_modify(ZFS_IOC_POOL_REGUID,
	zfs_ioc_pool_reguid);

	zfs_ioctl_register_pool_meta(ZFS_IOC_POOL_CONFIGS,
	zfs_ioc_pool_configs, zfs_secpolicy_none);
	zfs_ioctl_register_pool_meta(ZFS_IOC_POOL_TRYIMPORT,
	zfs_ioc_pool_tryimport, zfs_secpolicy_config);
	zfs_ioctl_register_pool_meta(ZFS_IOC_INJECT_FAULT,
	zfs_ioc_inject_fault, zfs_secpolicy_inject);
	zfs_ioctl_register_pool_meta(ZFS_IOC_CLEAR_FAULT,
	zfs_ioc_clear_fault, zfs_secpolicy_inject);
	zfs_ioctl_register_pool_meta(ZFS_IOC_INJECT_LIST_NEXT,
	zfs_ioc_inject_list_next, zfs_secpolicy_inject);

	/*
	* pool destroy, and export don't log the history as part of
	* zfsdev_ioctl, but rather zfs_ioc_pool_export
	* does the logging of those commands.
	*/
	zfs_ioctl_register_pool(ZFS_IOC_POOL_DESTROY, zfs_ioc_pool_destroy,
	zfs_secpolicy_config, B_FALSE, POOL_CHECK_SUSPENDED);
	zfs_ioctl_register_pool(ZFS_IOC_POOL_EXPORT, zfs_ioc_pool_export,
	zfs_secpolicy_config, B_FALSE, POOL_CHECK_SUSPENDED);

	zfs_ioctl_register_pool(ZFS_IOC_POOL_STATS, zfs_ioc_pool_stats,
	zfs_secpolicy_read, B_FALSE, POOL_CHECK_NONE);
	zfs_ioctl_register_pool(ZFS_IOC_POOL_GET_PROPS, zfs_ioc_pool_get_props,
	zfs_secpolicy_read, B_FALSE, POOL_CHECK_NONE);

	zfs_ioctl_register_pool(ZFS_IOC_ERROR_LOG, zfs_ioc_error_log,
	zfs_secpolicy_inject, B_FALSE, POOL_CHECK_SUSPENDED);
	zfs_ioctl_register_pool(ZFS_IOC_DSOBJ_TO_DSNAME,
	zfs_ioc_dsobj_to_dsname,
	zfs_secpolicy_diff, B_FALSE, POOL_CHECK_SUSPENDED);
	zfs_ioctl_register_pool(ZFS_IOC_POOL_GET_HISTORY,
	zfs_ioc_pool_get_history,
	zfs_secpolicy_config, B_FALSE, POOL_CHECK_SUSPENDED);

	zfs_ioctl_register_pool(ZFS_IOC_POOL_IMPORT, zfs_ioc_pool_import,
	zfs_secpolicy_config, B_TRUE, POOL_CHECK_NONE);

	zfs_ioctl_register_pool(ZFS_IOC_CLEAR, zfs_ioc_clear,
	zfs_secpolicy_config, B_TRUE, POOL_CHECK_READONLY);

	zfs_ioctl_register_dataset_read(ZFS_IOC_SPACE_WRITTEN,
	zfs_ioc_space_written);
	zfs_ioctl_register_dataset_read(ZFS_IOC_OBJSET_RECVD_PROPS,
	zfs_ioc_objset_recvd_props);
	zfs_ioctl_register_dataset_read(ZFS_IOC_NEXT_OBJ,
	zfs_ioc_next_obj);
	zfs_ioctl_register_dataset_read(ZFS_IOC_GET_FSACL,
	zfs_ioc_get_fsacl);
	zfs_ioctl_register_dataset_read(ZFS_IOC_OBJSET_STATS,
	zfs_ioc_objset_stats);
	zfs_ioctl_register_dataset_read(ZFS_IOC_OBJSET_ZPLPROPS,
	zfs_ioc_objset_zplprops);
	zfs_ioctl_register_dataset_read(ZFS_IOC_DATASET_LIST_NEXT,
	zfs_ioc_dataset_list_next);
	zfs_ioctl_register_dataset_read(ZFS_IOC_SNAPSHOT_LIST_NEXT,
	zfs_ioc_snapshot_list_next);
	zfs_ioctl_register_dataset_read(ZFS_IOC_SEND_PROGRESS,
	zfs_ioc_send_progress);

	zfs_ioctl_register_dataset_read_secpolicy(ZFS_IOC_DIFF,
	zfs_ioc_diff, zfs_secpolicy_diff);
	zfs_ioctl_register_dataset_read_secpolicy(ZFS_IOC_OBJ_TO_STATS,
	zfs_ioc_obj_to_stats, zfs_secpolicy_diff);
	zfs_ioctl_register_dataset_read_secpolicy(ZFS_IOC_OBJ_TO_PATH,
	zfs_ioc_obj_to_path, zfs_secpolicy_diff);
	zfs_ioctl_register_dataset_read_secpolicy(ZFS_IOC_USERSPACE_ONE,
	zfs_ioc_userspace_one, zfs_secpolicy_userspace_one);
	zfs_ioctl_register_dataset_read_secpolicy(ZFS_IOC_USERSPACE_MANY,
	zfs_ioc_userspace_many, zfs_secpolicy_userspace_many);
	zfs_ioctl_register_dataset_read_secpolicy(ZFS_IOC_SEND,
	zfs_ioc_send, zfs_secpolicy_send);

	zfs_ioctl_register_dataset_modify(ZFS_IOC_SET_PROP, zfs_ioc_set_prop,
	zfs_secpolicy_none);
	zfs_ioctl_register_dataset_modify(ZFS_IOC_DESTROY, zfs_ioc_destroy,
	zfs_secpolicy_destroy);
	zfs_ioctl_register_dataset_modify(ZFS_IOC_RENAME, zfs_ioc_rename,
	zfs_secpolicy_rename);
	zfs_ioctl_register_dataset_modify(ZFS_IOC_RECV, zfs_ioc_recv,
	zfs_secpolicy_recv);
	zfs_ioctl_register_dataset_modify(ZFS_IOC_PROMOTE, zfs_ioc_promote,
	zfs_secpolicy_promote);
	zfs_ioctl_register_dataset_modify(ZFS_IOC_INHERIT_PROP,
	zfs_ioc_inherit_prop, zfs_secpolicy_inherit_prop);
	zfs_ioctl_register_dataset_modify(ZFS_IOC_SET_FSACL, zfs_ioc_set_fsacl,
	zfs_secpolicy_set_fsacl);

	zfs_ioctl_register_dataset_nolog(ZFS_IOC_SHARE, zfs_ioc_share,
	zfs_secpolicy_share, POOL_CHECK_NONE);
	zfs_ioctl_register_dataset_nolog(ZFS_IOC_SMB_ACL, zfs_ioc_smb_acl,
	zfs_secpolicy_smb_acl, POOL_CHECK_NONE);
	zfs_ioctl_register_dataset_nolog(ZFS_IOC_USERSPACE_UPGRADE,
	zfs_ioc_userspace_upgrade, zfs_secpolicy_userspace_upgrade,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY);
	zfs_ioctl_register_dataset_nolog(ZFS_IOC_TMP_SNAPSHOT,
	zfs_ioc_tmp_snapshot, zfs_secpolicy_tmp_snapshot,
	POOL_CHECK_SUSPENDED \| POOL_CHECK_READONLY);

	zfs_ioctl_register_legacy(ZFS_IOC_EVENTS_NEXT, zfs_ioc_events_next,
	zfs_secpolicy_config, NO_NAME, B_FALSE, POOL_CHECK_NONE);
	zfs_ioctl_register_legacy(ZFS_IOC_EVENTS_CLEAR, zfs_ioc_events_clear,
	zfs_secpolicy_config, NO_NAME, B_FALSE, POOL_CHECK_NONE);
	zfs_ioctl_register_legacy(ZFS_IOC_EVENTS_SEEK, zfs_ioc_events_seek,
	zfs_secpolicy_config, NO_NAME, B_FALSE, POOL_CHECK_NONE);

	zfs_ioctl_init_os();
	}

	/*
	* Verify that for non-legacy ioctls the input nvlist
	* pairs match against the expected input.
	*
	* Possible errors are:
	* ZFS_ERR_IOC_ARG_UNAVAIL An unrecognized nvpair was encountered
	* ZFS_ERR_IOC_ARG_REQUIRED A required nvpair is missing
	* ZFS_ERR_IOC_ARG_BADTYPE Invalid type for nvpair
	*/
	static int
	zfs_check_input_nvpairs(nvlist_t innvl, const zfs_ioc_vec_t vec)
	{
	const zfs_ioc_key_t *nvl_keys = vec->zvec_nvl_keys;
	boolean_t required_keys_found = B_FALSE;

	/*
	* examine each input pair
	*/
	for (nvpair_t *pair = nvlist_next_nvpair(innvl, NULL);
	pair != NULL; pair = nvlist_next_nvpair(innvl, pair)) {
	char *name = nvpair_name(pair);
	data_type_t type = nvpair_type(pair);
	boolean_t identified = B_FALSE;

	/*
	* check pair against the documented names and type
	*/
	for (int k = 0; k < vec->zvec_nvl_key_count; k++) {
	/* if not a wild card name, check for an exact match */
	if ((nvl_keys[k].zkey_flags & ZK_WILDCARDLIST) == 0 &&
	strcmp(nvl_keys[k].zkey_name, name) != 0)
	continue;

	identified = B_TRUE;

	if (nvl_keys[k].zkey_type != DATA_TYPE_ANY &&
	nvl_keys[k].zkey_type != type) {
	return (SET_ERROR(ZFS_ERR_IOC_ARG_BADTYPE));
	}

	if (nvl_keys[k].zkey_flags & ZK_OPTIONAL)
	continue;

	required_keys_found = B_TRUE;
	break;
	}

	/* allow an 'optional' key, everything else is invalid */
	if (!identified &&
	(strcmp(name, "optional") != 0 \|\|
	type != DATA_TYPE_NVLIST)) {
	return (SET_ERROR(ZFS_ERR_IOC_ARG_UNAVAIL));
	}
	}

	/* verify that all required keys were found */
	for (int k = 0; k < vec->zvec_nvl_key_count; k++) {
	if (nvl_keys[k].zkey_flags & ZK_OPTIONAL)
	continue;

	if (nvl_keys[k].zkey_flags & ZK_WILDCARDLIST) {
	/* at least one non-optional key is expected here */
	if (!required_keys_found)
	return (SET_ERROR(ZFS_ERR_IOC_ARG_REQUIRED));
	continue;
	}

	if (!nvlist_exists(innvl, nvl_keys[k].zkey_name))
	return (SET_ERROR(ZFS_ERR_IOC_ARG_REQUIRED));
	}

	return (0);
	}

	static int
	pool_status_check(const char *name, zfs_ioc_namecheck_t type,
	zfs_ioc_poolcheck_t check)
	{
	spa_t *spa;
	int error;

	ASSERT(type == POOL_NAME \|\| type == DATASET_NAME \|\|
	type == ENTITY_NAME);

	if (check & POOL_CHECK_NONE)
	return (0);

	error = spa_open(name, &spa, FTAG);
	if (error == 0) {
	if ((check & POOL_CHECK_SUSPENDED) && spa_suspended(spa))
	error = SET_ERROR(EAGAIN);
	else if ((check & POOL_CHECK_READONLY) && !spa_writeable(spa))
	error = SET_ERROR(EROFS);
	spa_close(spa, FTAG);
	}
	return (error);
	}

	int
	-zfsdev_getminor(int fd, minor_t *minorp)
	+zfsdev_getminor(zfs_file_t fp, minor_t minorp)
	{
	zfsdev_state_t zs, fpd;
	- zfs_file_t *fp;
	- int rc;

	ASSERT(!MUTEX_HELD(&zfsdev_state_lock));

	- if ((rc = zfs_file_get(fd, &fp)))
	- return (rc);
	-
	fpd = zfs_file_private(fp);
	if (fpd == NULL)
	return (SET_ERROR(EBADF));

	mutex_enter(&zfsdev_state_lock);

	for (zs = zfsdev_state_list; zs != NULL; zs = zs->zs_next) {

	if (zs->zs_minor == -1)
	continue;

	if (fpd == zs) {
	*minorp = fpd->zs_minor;
	mutex_exit(&zfsdev_state_lock);
	return (0);
	}
	}

	mutex_exit(&zfsdev_state_lock);

	return (SET_ERROR(EBADF));
	}

	static void *
	zfsdev_get_state_impl(minor_t minor, enum zfsdev_state_type which)
	{
	zfsdev_state_t *zs;

	for (zs = zfsdev_state_list; zs != NULL; zs = zs->zs_next) {
	if (zs->zs_minor == minor) {
	smp_rmb();
	switch (which) {
	case ZST_ONEXIT:
	return (zs->zs_onexit);
	case ZST_ZEVENT:
	return (zs->zs_zevent);
	case ZST_ALL:
	return (zs);
	}
	}
	}

	return (NULL);
	}

	void *
	zfsdev_get_state(minor_t minor, enum zfsdev_state_type which)
	{
	void *ptr;

	ptr = zfsdev_get_state_impl(minor, which);

	return (ptr);
	}

	/*
	* Find a free minor number. The zfsdev_state_list is expected to
	* be short since it is only a list of currently open file handles.
	*/
	minor_t
	zfsdev_minor_alloc(void)
	{
	static minor_t last_minor = 0;
	minor_t m;

	ASSERT(MUTEX_HELD(&zfsdev_state_lock));

	for (m = last_minor + 1; m != last_minor; m++) {
	if (m > ZFSDEV_MAX_MINOR)
	m = 1;
	if (zfsdev_get_state_impl(m, ZST_ALL) == NULL) {
	last_minor = m;
	return (m);
	}
	}

	return (0);
	}

	long
	zfsdev_ioctl_common(uint_t vecnum, zfs_cmd_t *zc, int flag)
	{
	int error, cmd;
	const zfs_ioc_vec_t *vec;
	char *saved_poolname = NULL;
	uint64_t max_nvlist_src_size;
	size_t saved_poolname_len = 0;
	nvlist_t *innvl = NULL;
	fstrans_cookie_t cookie;
	hrtime_t start_time = gethrtime();

	cmd = vecnum;
	error = 0;
	if (vecnum >= sizeof (zfs_ioc_vec) / sizeof (zfs_ioc_vec[0]))
	return (SET_ERROR(ZFS_ERR_IOC_CMD_UNAVAIL));

	vec = &zfs_ioc_vec[vecnum];

	/*
	* The registered ioctl list may be sparse, verify that either
	* a normal or legacy handler are registered.
	*/
	if (vec->zvec_func == NULL && vec->zvec_legacy_func == NULL)
	return (SET_ERROR(ZFS_ERR_IOC_CMD_UNAVAIL));

	zc->zc_iflags = flag & FKIOCTL;
	max_nvlist_src_size = zfs_max_nvlist_src_size_os();
	if (zc->zc_nvlist_src_size > max_nvlist_src_size) {
	/*
	* Make sure the user doesn't pass in an insane value for
	* zc_nvlist_src_size. We have to check, since we will end
	* up allocating that much memory inside of get_nvlist(). This
	* prevents a nefarious user from allocating tons of kernel
	* memory.
	*
	* Also, we return EINVAL instead of ENOMEM here. The reason
	* being that returning ENOMEM from an ioctl() has a special
	* connotation; that the user's size value is too small and
	* needs to be expanded to hold the nvlist. See
	* zcmd_expand_dst_nvlist() for details.
	*/
	error = SET_ERROR(EINVAL); /* User's size too big */

	} else if (zc->zc_nvlist_src_size != 0) {
	error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
	zc->zc_iflags, &innvl);
	if (error != 0)
	goto out;
	}

	/*
	* Ensure that all pool/dataset names are valid before we pass down to
	* the lower layers.
	*/
	zc->zc_name[sizeof (zc->zc_name) - 1] = '\0';
	switch (vec->zvec_namecheck) {
	case POOL_NAME:
	if (pool_namecheck(zc->zc_name, NULL, NULL) != 0)
	error = SET_ERROR(EINVAL);
	else
	error = pool_status_check(zc->zc_name,
	vec->zvec_namecheck, vec->zvec_pool_check);
	break;

	case DATASET_NAME:
	if (dataset_namecheck(zc->zc_name, NULL, NULL) != 0)
	error = SET_ERROR(EINVAL);
	else
	error = pool_status_check(zc->zc_name,
	vec->zvec_namecheck, vec->zvec_pool_check);
	break;

	case ENTITY_NAME:
	if (entity_namecheck(zc->zc_name, NULL, NULL) != 0) {
	error = SET_ERROR(EINVAL);
	} else {
	error = pool_status_check(zc->zc_name,
	vec->zvec_namecheck, vec->zvec_pool_check);
	}
	break;

	case NO_NAME:
	break;
	}
	/*
	* Ensure that all input pairs are valid before we pass them down
	* to the lower layers.
	*
	* The vectored functions can use fnvlist_lookup_{type} for any
	* required pairs since zfs_check_input_nvpairs() confirmed that
	* they exist and are of the correct type.
	*/
	if (error == 0 && vec->zvec_func != NULL) {
	error = zfs_check_input_nvpairs(innvl, vec);
	if (error != 0)
	goto out;
	}

	if (error == 0) {
	cookie = spl_fstrans_mark();
	error = vec->zvec_secpolicy(zc, innvl, CRED());
	spl_fstrans_unmark(cookie);
	}

	if (error != 0)
	goto out;

	/* legacy ioctls can modify zc_name */
	/*
	* Can't use kmem_strdup() as we might truncate the string and
	* kmem_strfree() would then free with incorrect size.
	*/
	saved_poolname_len = strlen(zc->zc_name) + 1;
	saved_poolname = kmem_alloc(saved_poolname_len, KM_SLEEP);

	strlcpy(saved_poolname, zc->zc_name, saved_poolname_len);
	saved_poolname[strcspn(saved_poolname, "/@#")] = '\0';

	if (vec->zvec_func != NULL) {
	nvlist_t *outnvl;
	int puterror = 0;
	spa_t *spa;
	nvlist_t *lognv = NULL;

	ASSERT(vec->zvec_legacy_func == NULL);

	/*
	* Add the innvl to the lognv before calling the func,
	* in case the func changes the innvl.
	*/
	if (vec->zvec_allow_log) {
	lognv = fnvlist_alloc();
	fnvlist_add_string(lognv, ZPOOL_HIST_IOCTL,
	vec->zvec_name);
	if (!nvlist_empty(innvl)) {
	fnvlist_add_nvlist(lognv, ZPOOL_HIST_INPUT_NVL,
	innvl);
	}
	}

	outnvl = fnvlist_alloc();
	cookie = spl_fstrans_mark();
	error = vec->zvec_func(zc->zc_name, innvl, outnvl);
	spl_fstrans_unmark(cookie);

	/*
	* Some commands can partially execute, modify state, and still
	* return an error. In these cases, attempt to record what
	* was modified.
	*/
	if ((error == 0 \|\|
	(cmd == ZFS_IOC_CHANNEL_PROGRAM && error != EINVAL)) &&
	vec->zvec_allow_log &&
	spa_open(zc->zc_name, &spa, FTAG) == 0) {
	if (!nvlist_empty(outnvl)) {
	size_t out_size = fnvlist_size(outnvl);
	if (out_size > zfs_history_output_max) {
	fnvlist_add_int64(lognv,
	ZPOOL_HIST_OUTPUT_SIZE, out_size);
	} else {
	fnvlist_add_nvlist(lognv,
	ZPOOL_HIST_OUTPUT_NVL, outnvl);
	}
	}
	if (error != 0) {
	fnvlist_add_int64(lognv, ZPOOL_HIST_ERRNO,
	error);
	}
	fnvlist_add_int64(lognv, ZPOOL_HIST_ELAPSED_NS,
	gethrtime() - start_time);
	(void) spa_history_log_nvl(spa, lognv);
	spa_close(spa, FTAG);
	}
	fnvlist_free(lognv);

	if (!nvlist_empty(outnvl) \|\| zc->zc_nvlist_dst_size != 0) {
	int smusherror = 0;
	if (vec->zvec_smush_outnvlist) {
	smusherror = nvlist_smush(outnvl,
	zc->zc_nvlist_dst_size);
	}
	if (smusherror == 0)
	puterror = put_nvlist(zc, outnvl);
	}

	if (puterror != 0)
	error = puterror;

	nvlist_free(outnvl);
	} else {
	cookie = spl_fstrans_mark();
	error = vec->zvec_legacy_func(zc);
	spl_fstrans_unmark(cookie);
	}

	out:
	nvlist_free(innvl);
	if (error == 0 && vec->zvec_allow_log) {
	char *s = tsd_get(zfs_allow_log_key);
	if (s != NULL)
	kmem_strfree(s);
	(void) tsd_set(zfs_allow_log_key, kmem_strdup(saved_poolname));
	}
	if (saved_poolname != NULL)
	kmem_free(saved_poolname, saved_poolname_len);

	return (error);
	}

	int
	zfs_kmod_init(void)
	{
	int error;

	if ((error = zvol_init()) != 0)
	return (error);

	spa_init(SPA_MODE_READ \| SPA_MODE_WRITE);
	zfs_init();

	zfs_ioctl_init();

	mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL);
	zfsdev_state_list = kmem_zalloc(sizeof (zfsdev_state_t), KM_SLEEP);
	zfsdev_state_list->zs_minor = -1;

	if ((error = zfsdev_attach()) != 0)
	goto out;

	tsd_create(&zfs_fsyncer_key, NULL);
	tsd_create(&rrw_tsd_key, rrw_tsd_destroy);
	tsd_create(&zfs_allow_log_key, zfs_allow_log_destroy);

	return (0);
	out:
	zfs_fini();
	spa_fini();
	zvol_fini();

	return (error);
	}

	void
	zfs_kmod_fini(void)
	{
	zfsdev_state_t zs, zsnext = NULL;

	zfsdev_detach();

	mutex_destroy(&zfsdev_state_lock);

	for (zs = zfsdev_state_list; zs != NULL; zs = zsnext) {
	zsnext = zs->zs_next;
	if (zs->zs_onexit)
	zfs_onexit_destroy(zs->zs_onexit);
	if (zs->zs_zevent)
	zfs_zevent_destroy(zs->zs_zevent);
	kmem_free(zs, sizeof (zfsdev_state_t));
	}

	zfs_ereport_taskq_fini(); /* run before zfs_fini() on Linux */
	zfs_fini();
	spa_fini();
	zvol_fini();

	tsd_destroy(&zfs_fsyncer_key);
	tsd_destroy(&rrw_tsd_key);
	tsd_destroy(&zfs_allow_log_key);
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs, zfs_, max_nvlist_src_size, ULONG, ZMOD_RW,
	"Maximum size in bytes allowed for src nvlist passed with ZFS ioctls");

	ZFS_MODULE_PARAM(zfs, zfs_, history_output_max, ULONG, ZMOD_RW,
	"Maximum size in bytes of ZFS ioctl output that will be logged");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/zfs_log.c b/sys/contrib/openzfs/module/zfs/zfs_log.c
	index 30d5c4821ae5..c2f48210398c 100644
	--- a/sys/contrib/openzfs/module/zfs/zfs_log.c
	+++ b/sys/contrib/openzfs/module/zfs/zfs_log.c
	@@ -1,786 +1,788 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2015, 2018 by Delphix. All rights reserved.
	*/


	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/sysmacros.h>
	#include <sys/cmn_err.h>
	#include <sys/kmem.h>
	#include <sys/thread.h>
	#include <sys/file.h>
	#include <sys/vfs.h>
	#include <sys/zfs_znode.h>
	#include <sys/zfs_dir.h>
	#include <sys/zil.h>
	#include <sys/zil_impl.h>
	#include <sys/byteorder.h>
	#include <sys/policy.h>
	#include <sys/stat.h>
	#include <sys/acl.h>
	#include <sys/dmu.h>
	#include <sys/dbuf.h>
	#include <sys/spa.h>
	#include <sys/zfs_fuid.h>
	#include <sys/dsl_dataset.h>

	/*
	* These zfs_log_* functions must be called within a dmu tx, in one
	* of 2 contexts depending on zilog->z_replay:
	*
	* Non replay mode
	* ---------------
	* We need to record the transaction so that if it is committed to
	* the Intent Log then it can be replayed. An intent log transaction
	* structure (itx_t) is allocated and all the information necessary to
	* possibly replay the transaction is saved in it. The itx is then assigned
	* a sequence number and inserted in the in-memory list anchored in the zilog.
	*
	* Replay mode
	* -----------
	* We need to mark the intent log record as replayed in the log header.
	* This is done in the same transaction as the replay so that they
	* commit atomically.
	*/

	int
	zfs_log_create_txtype(zil_create_t type, vsecattr_t vsecp, vattr_t vap)
	{
	int isxvattr = (vap->va_mask & ATTR_XVATTR);
	switch (type) {
	case Z_FILE:
	if (vsecp == NULL && !isxvattr)
	return (TX_CREATE);
	if (vsecp && isxvattr)
	return (TX_CREATE_ACL_ATTR);
	if (vsecp)
	return (TX_CREATE_ACL);
	else
	return (TX_CREATE_ATTR);
	/NOTREACHED/
	case Z_DIR:
	if (vsecp == NULL && !isxvattr)
	return (TX_MKDIR);
	if (vsecp && isxvattr)
	return (TX_MKDIR_ACL_ATTR);
	if (vsecp)
	return (TX_MKDIR_ACL);
	else
	return (TX_MKDIR_ATTR);
	case Z_XATTRDIR:
	return (TX_MKXATTR);
	}
	ASSERT(0);
	return (TX_MAX_TYPE);
	}

	/*
	* build up the log data necessary for logging xvattr_t
	* First lr_attr_t is initialized. following the lr_attr_t
	* is the mapsize and attribute bitmap copied from the xvattr_t.
	* Following the bitmap and bitmapsize two 64 bit words are reserved
	* for the create time which may be set. Following the create time
	* records a single 64 bit integer which has the bits to set on
	* replay for the xvattr.
	*/
	static void
	zfs_log_xvattr(lr_attr_t lrattr, xvattr_t xvap)
	{
	uint32_t *bitmap;
	uint64_t *attrs;
	uint64_t *crtime;
	xoptattr_t *xoap;
	void *scanstamp;
	int i;

	xoap = xva_getxoptattr(xvap);
	ASSERT(xoap);

	lrattr->lr_attr_masksize = xvap->xva_mapsize;
	bitmap = &lrattr->lr_attr_bitmap;
	for (i = 0; i != xvap->xva_mapsize; i++, bitmap++) {
	*bitmap = xvap->xva_reqattrmap[i];
	}

	/* Now pack the attributes up in a single uint64_t */
	attrs = (uint64_t *)bitmap;
	+ *attrs = 0;
	crtime = attrs + 1;
	+ bzero(crtime, 2 * sizeof (uint64_t));
	scanstamp = (caddr_t)(crtime + 2);
	- *attrs = 0;
	+ bzero(scanstamp, AV_SCANSTAMP_SZ);
	if (XVA_ISSET_REQ(xvap, XAT_READONLY))
	*attrs \|= (xoap->xoa_readonly == 0) ? 0 :
	XAT0_READONLY;
	if (XVA_ISSET_REQ(xvap, XAT_HIDDEN))
	*attrs \|= (xoap->xoa_hidden == 0) ? 0 :
	XAT0_HIDDEN;
	if (XVA_ISSET_REQ(xvap, XAT_SYSTEM))
	*attrs \|= (xoap->xoa_system == 0) ? 0 :
	XAT0_SYSTEM;
	if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE))
	*attrs \|= (xoap->xoa_archive == 0) ? 0 :
	XAT0_ARCHIVE;
	if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE))
	*attrs \|= (xoap->xoa_immutable == 0) ? 0 :
	XAT0_IMMUTABLE;
	if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK))
	*attrs \|= (xoap->xoa_nounlink == 0) ? 0 :
	XAT0_NOUNLINK;
	if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY))
	*attrs \|= (xoap->xoa_appendonly == 0) ? 0 :
	XAT0_APPENDONLY;
	if (XVA_ISSET_REQ(xvap, XAT_OPAQUE))
	*attrs \|= (xoap->xoa_opaque == 0) ? 0 :
	XAT0_APPENDONLY;
	if (XVA_ISSET_REQ(xvap, XAT_NODUMP))
	*attrs \|= (xoap->xoa_nodump == 0) ? 0 :
	XAT0_NODUMP;
	if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED))
	*attrs \|= (xoap->xoa_av_quarantined == 0) ? 0 :
	XAT0_AV_QUARANTINED;
	if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED))
	*attrs \|= (xoap->xoa_av_modified == 0) ? 0 :
	XAT0_AV_MODIFIED;
	if (XVA_ISSET_REQ(xvap, XAT_CREATETIME))
	ZFS_TIME_ENCODE(&xoap->xoa_createtime, crtime);
	if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
	ASSERT(!XVA_ISSET_REQ(xvap, XAT_PROJID));

	bcopy(xoap->xoa_av_scanstamp, scanstamp, AV_SCANSTAMP_SZ);
	} else if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
	/*
	* XAT_PROJID and XAT_AV_SCANSTAMP will never be valid
	* at the same time, so we can share the same space.
	*/
	bcopy(&xoap->xoa_projid, scanstamp, sizeof (uint64_t));
	}
	if (XVA_ISSET_REQ(xvap, XAT_REPARSE))
	*attrs \|= (xoap->xoa_reparse == 0) ? 0 :
	XAT0_REPARSE;
	if (XVA_ISSET_REQ(xvap, XAT_OFFLINE))
	*attrs \|= (xoap->xoa_offline == 0) ? 0 :
	XAT0_OFFLINE;
	if (XVA_ISSET_REQ(xvap, XAT_SPARSE))
	*attrs \|= (xoap->xoa_sparse == 0) ? 0 :
	XAT0_SPARSE;
	if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT))
	*attrs \|= (xoap->xoa_projinherit == 0) ? 0 :
	XAT0_PROJINHERIT;
	}

	static void *
	zfs_log_fuid_ids(zfs_fuid_info_t fuidp, void start)
	{
	zfs_fuid_t *zfuid;
	uint64_t *fuidloc = start;

	/* First copy in the ACE FUIDs */
	for (zfuid = list_head(&fuidp->z_fuids); zfuid;
	zfuid = list_next(&fuidp->z_fuids, zfuid)) {
	*fuidloc++ = zfuid->z_logfuid;
	}
	return (fuidloc);
	}


	static void *
	zfs_log_fuid_domains(zfs_fuid_info_t fuidp, void start)
	{
	zfs_fuid_domain_t *zdomain;

	/* now copy in the domain info, if any */
	if (fuidp->z_domain_str_sz != 0) {
	for (zdomain = list_head(&fuidp->z_domains); zdomain;
	zdomain = list_next(&fuidp->z_domains, zdomain)) {
	bcopy((void *)zdomain->z_domain, start,
	strlen(zdomain->z_domain) + 1);
	start = (caddr_t)start +
	strlen(zdomain->z_domain) + 1;
	}
	}
	return (start);
	}

	/*
	* If zp is an xattr node, check whether the xattr owner is unlinked.
	* We don't want to log anything if the owner is unlinked.
	*/
	static int
	zfs_xattr_owner_unlinked(znode_t *zp)
	{
	int unlinked = 0;
	znode_t *dzp;
	#ifdef __FreeBSD__
	znode_t *tzp = zp;

	/*
	* zrele drops the vnode lock which violates the VOP locking contract
	* on FreeBSD. See comment at the top of zfs_replay.c for more detail.
	*/
	/*
	* if zp is XATTR node, keep walking up via z_xattr_parent until we
	* get the owner
	*/
	while (tzp->z_pflags & ZFS_XATTR) {
	ASSERT3U(zp->z_xattr_parent, !=, 0);
	if (zfs_zget(ZTOZSB(tzp), tzp->z_xattr_parent, &dzp) != 0) {
	unlinked = 1;
	break;
	}

	if (tzp != zp)
	zrele(tzp);
	tzp = dzp;
	unlinked = tzp->z_unlinked;
	}
	if (tzp != zp)
	zrele(tzp);
	#else
	zhold(zp);
	/*
	* if zp is XATTR node, keep walking up via z_xattr_parent until we
	* get the owner
	*/
	while (zp->z_pflags & ZFS_XATTR) {
	ASSERT3U(zp->z_xattr_parent, !=, 0);
	if (zfs_zget(ZTOZSB(zp), zp->z_xattr_parent, &dzp) != 0) {
	unlinked = 1;
	break;
	}

	zrele(zp);
	zp = dzp;
	unlinked = zp->z_unlinked;
	}
	zrele(zp);
	#endif
	return (unlinked);
	}

	/*
	* Handles TX_CREATE, TX_CREATE_ATTR, TX_MKDIR, TX_MKDIR_ATTR and
	* TK_MKXATTR transactions.
	*
	* TX_CREATE and TX_MKDIR are standard creates, but they may have FUID
	* domain information appended prior to the name. In this case the
	* uid/gid in the log record will be a log centric FUID.
	*
	* TX_CREATE_ACL_ATTR and TX_MKDIR_ACL_ATTR handle special creates that
	* may contain attributes, ACL and optional fuid information.
	*
	* TX_CREATE_ACL and TX_MKDIR_ACL handle special creates that specify
	* and ACL and normal users/groups in the ACEs.
	*
	* There may be an optional xvattr attribute information similar
	* to zfs_log_setattr.
	*
	* Also, after the file name "domain" strings may be appended.
	*/
	void
	zfs_log_create(zilog_t zilog, dmu_tx_t tx, uint64_t txtype,
	znode_t dzp, znode_t zp, const char name, vsecattr_t vsecp,
	zfs_fuid_info_t fuidp, vattr_t vap)
	{
	itx_t *itx;
	lr_create_t *lr;
	lr_acl_create_t *lracl;
	size_t aclsize = 0;
	size_t xvatsize = 0;
	size_t txsize;
	xvattr_t xvap = (xvattr_t )vap;
	void *end;
	size_t lrsize;
	size_t namesize = strlen(name) + 1;
	size_t fuidsz = 0;

	if (zil_replaying(zilog, tx) \|\| zfs_xattr_owner_unlinked(dzp))
	return;

	/*
	* If we have FUIDs present then add in space for
	* domains and ACE fuid's if any.
	*/
	if (fuidp) {
	fuidsz += fuidp->z_domain_str_sz;
	fuidsz += fuidp->z_fuid_cnt * sizeof (uint64_t);
	}

	if (vap->va_mask & ATTR_XVATTR)
	xvatsize = ZIL_XVAT_SIZE(xvap->xva_mapsize);

	if ((int)txtype == TX_CREATE_ATTR \|\| (int)txtype == TX_MKDIR_ATTR \|\|
	(int)txtype == TX_CREATE \|\| (int)txtype == TX_MKDIR \|\|
	(int)txtype == TX_MKXATTR) {
	txsize = sizeof (*lr) + namesize + fuidsz + xvatsize;
	lrsize = sizeof (*lr);
	} else {
	txsize =
	sizeof (lr_acl_create_t) + namesize + fuidsz +
	ZIL_ACE_LENGTH(aclsize) + xvatsize;
	lrsize = sizeof (lr_acl_create_t);
	}

	itx = zil_itx_create(txtype, txsize);

	lr = (lr_create_t *)&itx->itx_lr;
	lr->lr_doid = dzp->z_id;
	lr->lr_foid = zp->z_id;
	/* Store dnode slot count in 8 bits above object id. */
	LR_FOID_SET_SLOTS(lr->lr_foid, zp->z_dnodesize >> DNODE_SHIFT);
	lr->lr_mode = zp->z_mode;
	if (!IS_EPHEMERAL(KUID_TO_SUID(ZTOUID(zp)))) {
	lr->lr_uid = (uint64_t)KUID_TO_SUID(ZTOUID(zp));
	} else {
	lr->lr_uid = fuidp->z_fuid_owner;
	}
	if (!IS_EPHEMERAL(KGID_TO_SGID(ZTOGID(zp)))) {
	lr->lr_gid = (uint64_t)KGID_TO_SGID(ZTOGID(zp));
	} else {
	lr->lr_gid = fuidp->z_fuid_group;
	}
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &lr->lr_gen,
	sizeof (uint64_t));
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
	lr->lr_crtime, sizeof (uint64_t) * 2);

	if (sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(ZTOZSB(zp)), &lr->lr_rdev,
	sizeof (lr->lr_rdev)) != 0)
	lr->lr_rdev = 0;

	/*
	* Fill in xvattr info if any
	*/
	if (vap->va_mask & ATTR_XVATTR) {
	zfs_log_xvattr((lr_attr_t *)((caddr_t)lr + lrsize), xvap);
	end = (caddr_t)lr + lrsize + xvatsize;
	} else {
	end = (caddr_t)lr + lrsize;
	}

	/* Now fill in any ACL info */

	if (vsecp) {
	lracl = (lr_acl_create_t *)&itx->itx_lr;
	lracl->lr_aclcnt = vsecp->vsa_aclcnt;
	lracl->lr_acl_bytes = aclsize;
	lracl->lr_domcnt = fuidp ? fuidp->z_domain_cnt : 0;
	lracl->lr_fuidcnt = fuidp ? fuidp->z_fuid_cnt : 0;
	if (vsecp->vsa_aclflags & VSA_ACE_ACLFLAGS)
	lracl->lr_acl_flags = (uint64_t)vsecp->vsa_aclflags;
	else
	lracl->lr_acl_flags = 0;

	bcopy(vsecp->vsa_aclentp, end, aclsize);
	end = (caddr_t)end + ZIL_ACE_LENGTH(aclsize);
	}

	/* drop in FUID info */
	if (fuidp) {
	end = zfs_log_fuid_ids(fuidp, end);
	end = zfs_log_fuid_domains(fuidp, end);
	}
	/*
	* Now place file name in log record
	*/
	bcopy(name, end, namesize);

	zil_itx_assign(zilog, itx, tx);
	}

	/*
	* Handles both TX_REMOVE and TX_RMDIR transactions.
	*/
	void
	zfs_log_remove(zilog_t zilog, dmu_tx_t tx, uint64_t txtype,
	znode_t dzp, const char name, uint64_t foid, boolean_t unlinked)
	{
	itx_t *itx;
	lr_remove_t *lr;
	size_t namesize = strlen(name) + 1;

	if (zil_replaying(zilog, tx) \|\| zfs_xattr_owner_unlinked(dzp))
	return;

	itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
	lr = (lr_remove_t *)&itx->itx_lr;
	lr->lr_doid = dzp->z_id;
	bcopy(name, (char *)(lr + 1), namesize);

	itx->itx_oid = foid;

	/*
	* Object ids can be re-instantiated in the next txg so
	* remove any async transactions to avoid future leaks.
	* This can happen if a fsync occurs on the re-instantiated
	* object for a WR_INDIRECT or WR_NEED_COPY write, which gets
	* the new file data and flushes a write record for the old object.
	*/
	if (unlinked) {
	ASSERT((txtype & ~TX_CI) == TX_REMOVE);
	zil_remove_async(zilog, foid);
	}
	zil_itx_assign(zilog, itx, tx);
	}

	/*
	* Handles TX_LINK transactions.
	*/
	void
	zfs_log_link(zilog_t zilog, dmu_tx_t tx, uint64_t txtype,
	znode_t dzp, znode_t zp, const char *name)
	{
	itx_t *itx;
	lr_link_t *lr;
	size_t namesize = strlen(name) + 1;

	if (zil_replaying(zilog, tx))
	return;

	itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
	lr = (lr_link_t *)&itx->itx_lr;
	lr->lr_doid = dzp->z_id;
	lr->lr_link_obj = zp->z_id;
	bcopy(name, (char *)(lr + 1), namesize);

	zil_itx_assign(zilog, itx, tx);
	}

	/*
	* Handles TX_SYMLINK transactions.
	*/
	void
	zfs_log_symlink(zilog_t zilog, dmu_tx_t tx, uint64_t txtype,
	znode_t dzp, znode_t zp, const char name, const char link)
	{
	itx_t *itx;
	lr_create_t *lr;
	size_t namesize = strlen(name) + 1;
	size_t linksize = strlen(link) + 1;

	if (zil_replaying(zilog, tx))
	return;

	itx = zil_itx_create(txtype, sizeof (*lr) + namesize + linksize);
	lr = (lr_create_t *)&itx->itx_lr;
	lr->lr_doid = dzp->z_id;
	lr->lr_foid = zp->z_id;
	lr->lr_uid = KUID_TO_SUID(ZTOUID(zp));
	lr->lr_gid = KGID_TO_SGID(ZTOGID(zp));
	lr->lr_mode = zp->z_mode;
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &lr->lr_gen,
	sizeof (uint64_t));
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
	lr->lr_crtime, sizeof (uint64_t) * 2);
	bcopy(name, (char *)(lr + 1), namesize);
	bcopy(link, (char *)(lr + 1) + namesize, linksize);

	zil_itx_assign(zilog, itx, tx);
	}

	/*
	* Handles TX_RENAME transactions.
	*/
	void
	zfs_log_rename(zilog_t zilog, dmu_tx_t tx, uint64_t txtype, znode_t *sdzp,
	const char sname, znode_t tdzp, const char dname, znode_t szp)
	{
	itx_t *itx;
	lr_rename_t *lr;
	size_t snamesize = strlen(sname) + 1;
	size_t dnamesize = strlen(dname) + 1;

	if (zil_replaying(zilog, tx))
	return;

	itx = zil_itx_create(txtype, sizeof (*lr) + snamesize + dnamesize);
	lr = (lr_rename_t *)&itx->itx_lr;
	lr->lr_sdoid = sdzp->z_id;
	lr->lr_tdoid = tdzp->z_id;
	bcopy(sname, (char *)(lr + 1), snamesize);
	bcopy(dname, (char *)(lr + 1) + snamesize, dnamesize);
	itx->itx_oid = szp->z_id;

	zil_itx_assign(zilog, itx, tx);
	}

	/*
	* zfs_log_write() handles TX_WRITE transactions. The specified callback is
	* called as soon as the write is on stable storage (be it via a DMU sync or a
	* ZIL commit).
	*/
	long zfs_immediate_write_sz = 32768;

	void
	zfs_log_write(zilog_t zilog, dmu_tx_t tx, int txtype,
	znode_t *zp, offset_t off, ssize_t resid, int ioflag,
	zil_callback_t callback, void *callback_data)
	{
	dmu_buf_impl_t db = (dmu_buf_impl_t )sa_get_db(zp->z_sa_hdl);
	uint32_t blocksize = zp->z_blksz;
	itx_wr_state_t write_state;
	uintptr_t fsync_cnt;
	uint64_t gen = 0;

	if (zil_replaying(zilog, tx) \|\| zp->z_unlinked \|\|
	zfs_xattr_owner_unlinked(zp)) {
	if (callback != NULL)
	callback(callback_data);
	return;
	}

	if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
	write_state = WR_INDIRECT;
	else if (!spa_has_slogs(zilog->zl_spa) &&
	resid >= zfs_immediate_write_sz)
	write_state = WR_INDIRECT;
	else if (ioflag & (O_SYNC \| O_DSYNC))
	write_state = WR_COPIED;
	else
	write_state = WR_NEED_COPY;

	if ((fsync_cnt = (uintptr_t)tsd_get(zfs_fsyncer_key)) != 0) {
	(void) tsd_set(zfs_fsyncer_key, (void *)(fsync_cnt - 1));
	}

	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &gen,
	sizeof (gen));

	while (resid) {
	itx_t *itx;
	lr_write_t *lr;
	itx_wr_state_t wr_state = write_state;
	ssize_t len = resid;

	/*
	* A WR_COPIED record must fit entirely in one log block.
	* Large writes can use WR_NEED_COPY, which the ZIL will
	* split into multiple records across several log blocks
	* if necessary.
	*/
	if (wr_state == WR_COPIED &&
	resid > zil_max_copied_data(zilog))
	wr_state = WR_NEED_COPY;
	else if (wr_state == WR_INDIRECT)
	len = MIN(blocksize - P2PHASE(off, blocksize), resid);

	itx = zil_itx_create(txtype, sizeof (*lr) +
	(wr_state == WR_COPIED ? len : 0));
	lr = (lr_write_t *)&itx->itx_lr;

	/*
	* For WR_COPIED records, copy the data into the lr_write_t.
	*/
	if (wr_state == WR_COPIED) {
	int err;
	DB_DNODE_ENTER(db);
	err = dmu_read_by_dnode(DB_DNODE(db), off, len, lr + 1,
	DMU_READ_NO_PREFETCH);
	if (err != 0) {
	zil_itx_destroy(itx);
	itx = zil_itx_create(txtype, sizeof (*lr));
	lr = (lr_write_t *)&itx->itx_lr;
	wr_state = WR_NEED_COPY;
	}
	DB_DNODE_EXIT(db);
	}

	itx->itx_wr_state = wr_state;
	lr->lr_foid = zp->z_id;
	lr->lr_offset = off;
	lr->lr_length = len;
	lr->lr_blkoff = 0;
	BP_ZERO(&lr->lr_blkptr);

	itx->itx_private = ZTOZSB(zp);
	itx->itx_gen = gen;

	if (!(ioflag & (O_SYNC \| O_DSYNC)) && (zp->z_sync_cnt == 0) &&
	(fsync_cnt == 0))
	itx->itx_sync = B_FALSE;

	itx->itx_callback = callback;
	itx->itx_callback_data = callback_data;
	zil_itx_assign(zilog, itx, tx);

	off += len;
	resid -= len;
	}
	}

	/*
	* Handles TX_TRUNCATE transactions.
	*/
	void
	zfs_log_truncate(zilog_t zilog, dmu_tx_t tx, int txtype,
	znode_t *zp, uint64_t off, uint64_t len)
	{
	itx_t *itx;
	lr_truncate_t *lr;

	if (zil_replaying(zilog, tx) \|\| zp->z_unlinked \|\|
	zfs_xattr_owner_unlinked(zp))
	return;

	itx = zil_itx_create(txtype, sizeof (*lr));
	lr = (lr_truncate_t *)&itx->itx_lr;
	lr->lr_foid = zp->z_id;
	lr->lr_offset = off;
	lr->lr_length = len;

	itx->itx_sync = (zp->z_sync_cnt != 0);
	zil_itx_assign(zilog, itx, tx);
	}

	/*
	* Handles TX_SETATTR transactions.
	*/
	void
	zfs_log_setattr(zilog_t zilog, dmu_tx_t tx, int txtype,
	znode_t zp, vattr_t vap, uint_t mask_applied, zfs_fuid_info_t *fuidp)
	{
	itx_t *itx;
	lr_setattr_t *lr;
	xvattr_t xvap = (xvattr_t )vap;
	size_t recsize = sizeof (lr_setattr_t);
	void *start;

	if (zil_replaying(zilog, tx) \|\| zp->z_unlinked)
	return;

	/*
	* If XVATTR set, then log record size needs to allow
	* for lr_attr_t + xvattr mask, mapsize and create time
	* plus actual attribute values
	*/
	if (vap->va_mask & ATTR_XVATTR)
	recsize = sizeof (*lr) + ZIL_XVAT_SIZE(xvap->xva_mapsize);

	if (fuidp)
	recsize += fuidp->z_domain_str_sz;

	itx = zil_itx_create(txtype, recsize);
	lr = (lr_setattr_t *)&itx->itx_lr;
	lr->lr_foid = zp->z_id;
	lr->lr_mask = (uint64_t)mask_applied;
	lr->lr_mode = (uint64_t)vap->va_mode;
	if ((mask_applied & ATTR_UID) && IS_EPHEMERAL(vap->va_uid))
	lr->lr_uid = fuidp->z_fuid_owner;
	else
	lr->lr_uid = (uint64_t)vap->va_uid;

	if ((mask_applied & ATTR_GID) && IS_EPHEMERAL(vap->va_gid))
	lr->lr_gid = fuidp->z_fuid_group;
	else
	lr->lr_gid = (uint64_t)vap->va_gid;

	lr->lr_size = (uint64_t)vap->va_size;
	ZFS_TIME_ENCODE(&vap->va_atime, lr->lr_atime);
	ZFS_TIME_ENCODE(&vap->va_mtime, lr->lr_mtime);
	start = (lr_setattr_t *)(lr + 1);
	if (vap->va_mask & ATTR_XVATTR) {
	zfs_log_xvattr((lr_attr_t *)start, xvap);
	start = (caddr_t)start + ZIL_XVAT_SIZE(xvap->xva_mapsize);
	}

	/*
	* Now stick on domain information if any on end
	*/

	if (fuidp)
	(void) zfs_log_fuid_domains(fuidp, start);

	itx->itx_sync = (zp->z_sync_cnt != 0);
	zil_itx_assign(zilog, itx, tx);
	}

	/*
	* Handles TX_ACL transactions.
	*/
	void
	zfs_log_acl(zilog_t zilog, dmu_tx_t tx, znode_t *zp,
	vsecattr_t vsecp, zfs_fuid_info_t fuidp)
	{
	itx_t *itx;
	lr_acl_v0_t *lrv0;
	lr_acl_t *lr;
	int txtype;
	int lrsize;
	size_t txsize;
	size_t aclbytes = vsecp->vsa_aclentsz;

	if (zil_replaying(zilog, tx) \|\| zp->z_unlinked)
	return;

	txtype = (ZTOZSB(zp)->z_version < ZPL_VERSION_FUID) ?
	TX_ACL_V0 : TX_ACL;

	if (txtype == TX_ACL)
	lrsize = sizeof (*lr);
	else
	lrsize = sizeof (*lrv0);

	txsize = lrsize +
	((txtype == TX_ACL) ? ZIL_ACE_LENGTH(aclbytes) : aclbytes) +
	(fuidp ? fuidp->z_domain_str_sz : 0) +
	sizeof (uint64_t) * (fuidp ? fuidp->z_fuid_cnt : 0);

	itx = zil_itx_create(txtype, txsize);

	lr = (lr_acl_t *)&itx->itx_lr;
	lr->lr_foid = zp->z_id;
	if (txtype == TX_ACL) {
	lr->lr_acl_bytes = aclbytes;
	lr->lr_domcnt = fuidp ? fuidp->z_domain_cnt : 0;
	lr->lr_fuidcnt = fuidp ? fuidp->z_fuid_cnt : 0;
	if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS)
	lr->lr_acl_flags = (uint64_t)vsecp->vsa_aclflags;
	else
	lr->lr_acl_flags = 0;
	}
	lr->lr_aclcnt = (uint64_t)vsecp->vsa_aclcnt;

	if (txtype == TX_ACL_V0) {
	lrv0 = (lr_acl_v0_t *)lr;
	bcopy(vsecp->vsa_aclentp, (ace_t *)(lrv0 + 1), aclbytes);
	} else {
	void start = (ace_t )(lr + 1);

	bcopy(vsecp->vsa_aclentp, start, aclbytes);

	start = (caddr_t)start + ZIL_ACE_LENGTH(aclbytes);

	if (fuidp) {
	start = zfs_log_fuid_ids(fuidp, start);
	(void) zfs_log_fuid_domains(fuidp, start);
	}
	}

	itx->itx_sync = (zp->z_sync_cnt != 0);
	zil_itx_assign(zilog, itx, tx);
	}

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs, zfs_, immediate_write_sz, LONG, ZMOD_RW,
	"Largest data block to write to zil");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/zfs_onexit.c b/sys/contrib/openzfs/module/zfs/zfs_onexit.c
	index 2a1332e715ee..7c56dd9c97f5 100644
	--- a/sys/contrib/openzfs/module/zfs/zfs_onexit.c
	+++ b/sys/contrib/openzfs/module/zfs/zfs_onexit.c
	@@ -1,173 +1,176 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2013, 2020 by Delphix. All rights reserved.
	*/

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/errno.h>
	#include <sys/kmem.h>
	#include <sys/sunddi.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/zfs_onexit.h>
	#include <sys/zvol.h>

	/*
	* ZFS kernel routines may add/delete callback routines to be invoked
	* upon process exit (triggered via the close operation from the /dev/zfs
	* driver).
	*
	* These cleanup callbacks are intended to allow for the accumulation
	* of kernel state across multiple ioctls. User processes participate
	* simply by opening ZFS_DEV. This causes the ZFS driver to do create
	* some private data for the file descriptor and generating a unique
	* minor number. The process then passes along that file descriptor to
	* each ioctl that might have a cleanup operation.
	*
	* Consumers of the onexit routines should call zfs_onexit_fd_hold() early
	* on to validate the given fd and add a reference to its file table entry.
	* This allows the consumer to do its work and then add a callback, knowing
	* that zfs_onexit_add_cb() won't fail with EBADF. When finished, consumers
	* should call zfs_onexit_fd_rele().
	*
	* A simple example is zfs_ioc_recv(), where we might create an AVL tree
	* with dataset/GUID mappings and then reuse that tree on subsequent
	* zfs_ioc_recv() calls.
	*
	* On the first zfs_ioc_recv() call, dmu_recv_stream() will kmem_alloc()
	* the AVL tree and pass it along with a callback function to
	* zfs_onexit_add_cb(). The zfs_onexit_add_cb() routine will register the
	* callback and return an action handle.
	*
	* The action handle is then passed from user space to subsequent
	* zfs_ioc_recv() calls, so that dmu_recv_stream() can fetch its AVL tree
	* by calling zfs_onexit_cb_data() with the device minor number and
	* action handle.
	*
	* If the user process exits abnormally, the callback is invoked implicitly
	* as part of the driver close operation. Once the user space process is
	* finished with the accumulated kernel state, it can also just call close(2)
	* on the cleanup fd to trigger the cleanup callback.
	*/

	void
	zfs_onexit_init(zfs_onexit_t **zop)
	{
	zfs_onexit_t *zo;

	zo = *zop = kmem_zalloc(sizeof (zfs_onexit_t), KM_SLEEP);
	mutex_init(&zo->zo_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&zo->zo_actions, sizeof (zfs_onexit_action_node_t),
	offsetof(zfs_onexit_action_node_t, za_link));
	}

	void
	zfs_onexit_destroy(zfs_onexit_t *zo)
	{
	zfs_onexit_action_node_t *ap;

	mutex_enter(&zo->zo_lock);
	while ((ap = list_head(&zo->zo_actions)) != NULL) {
	list_remove(&zo->zo_actions, ap);
	mutex_exit(&zo->zo_lock);
	ap->za_func(ap->za_data);
	kmem_free(ap, sizeof (zfs_onexit_action_node_t));
	mutex_enter(&zo->zo_lock);
	}
	mutex_exit(&zo->zo_lock);

	list_destroy(&zo->zo_actions);
	mutex_destroy(&zo->zo_lock);
	kmem_free(zo, sizeof (zfs_onexit_t));
	}

	/*
	* Consumers might need to operate by minor number instead of fd, since
	* they might be running in another thread (e.g. txg_sync_thread). Callers
	* of this function must call zfs_onexit_fd_rele() when they're finished
	* using the minor number.
	*/
	-int
	+zfs_file_t *
	zfs_onexit_fd_hold(int fd, minor_t *minorp)
	{
	zfs_onexit_t *zo = NULL;
	- int error;

	- error = zfsdev_getminor(fd, minorp);
	+ zfs_file_t *fp = zfs_file_get(fd);
	+ if (fp == NULL)
	+ return (NULL);
	+
	+ int error = zfsdev_getminor(fp, minorp);
	if (error) {
	- zfs_onexit_fd_rele(fd);
	- return (error);
	+ zfs_onexit_fd_rele(fp);
	+ return (NULL);
	}

	zo = zfsdev_get_state(*minorp, ZST_ONEXIT);
	if (zo == NULL) {
	- zfs_onexit_fd_rele(fd);
	- return (SET_ERROR(EBADF));
	+ zfs_onexit_fd_rele(fp);
	+ return (NULL);
	}
	- return (0);
	+ return (fp);
	}

	void
	-zfs_onexit_fd_rele(int fd)
	+zfs_onexit_fd_rele(zfs_file_t *fp)
	{
	- zfs_file_put(fd);
	+ zfs_file_put(fp);
	}

	static int
	zfs_onexit_minor_to_state(minor_t minor, zfs_onexit_t **zo)
	{
	*zo = zfsdev_get_state(minor, ZST_ONEXIT);
	if (*zo == NULL)
	return (SET_ERROR(EBADF));

	return (0);
	}

	/*
	* Add a callback to be invoked when the calling process exits.
	*/
	int
	zfs_onexit_add_cb(minor_t minor, void (func)(void ), void *data,
	uint64_t *action_handle)
	{
	zfs_onexit_t *zo;
	zfs_onexit_action_node_t *ap;
	int error;

	error = zfs_onexit_minor_to_state(minor, &zo);
	if (error)
	return (error);

	ap = kmem_alloc(sizeof (zfs_onexit_action_node_t), KM_SLEEP);
	list_link_init(&ap->za_link);
	ap->za_func = func;
	ap->za_data = data;

	mutex_enter(&zo->zo_lock);
	list_insert_tail(&zo->zo_actions, ap);
	mutex_exit(&zo->zo_lock);
	if (action_handle)
	*action_handle = (uint64_t)(uintptr_t)ap;

	return (0);
	}
	diff --git a/sys/contrib/openzfs/module/zfs/zil.c b/sys/contrib/openzfs/module/zfs/zil.c
	index 7f11c3913c71..640e805d093a 100644
	--- a/sys/contrib/openzfs/module/zfs/zil.c
	+++ b/sys/contrib/openzfs/module/zfs/zil.c
	@@ -1,3697 +1,3733 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2014 Integros [integros.com]
	* Copyright (c) 2018 Datto Inc.
	*/

	/* Portions Copyright 2010 Robert Milkowski */

	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/spa_impl.h>
	#include <sys/dmu.h>
	#include <sys/zap.h>
	#include <sys/arc.h>
	#include <sys/stat.h>
	#include <sys/zil.h>
	#include <sys/zil_impl.h>
	#include <sys/dsl_dataset.h>
	#include <sys/vdev_impl.h>
	#include <sys/dmu_tx.h>
	#include <sys/dsl_pool.h>
	#include <sys/metaslab.h>
	#include <sys/trace_zfs.h>
	#include <sys/abd.h>

	/*
	* The ZFS Intent Log (ZIL) saves "transaction records" (itxs) of system
	* calls that change the file system. Each itx has enough information to
	* be able to replay them after a system crash, power loss, or
	* equivalent failure mode. These are stored in memory until either:
	*
	* 1. they are committed to the pool by the DMU transaction group
	* (txg), at which point they can be discarded; or
	* 2. they are committed to the on-disk ZIL for the dataset being
	* modified (e.g. due to an fsync, O_DSYNC, or other synchronous
	* requirement).
	*
	* In the event of a crash or power loss, the itxs contained by each
	* dataset's on-disk ZIL will be replayed when that dataset is first
	* instantiated (e.g. if the dataset is a normal filesystem, when it is
	* first mounted).
	*
	* As hinted at above, there is one ZIL per dataset (both the in-memory
	* representation, and the on-disk representation). The on-disk format
	* consists of 3 parts:
	*
	* - a single, per-dataset, ZIL header; which points to a chain of
	* - zero or more ZIL blocks; each of which contains
	* - zero or more ZIL records
	*
	* A ZIL record holds the information necessary to replay a single
	* system call transaction. A ZIL block can hold many ZIL records, and
	* the blocks are chained together, similarly to a singly linked list.
	*
	* Each ZIL block contains a block pointer (blkptr_t) to the next ZIL
	* block in the chain, and the ZIL header points to the first block in
	* the chain.
	*
	* Note, there is not a fixed place in the pool to hold these ZIL
	* blocks; they are dynamically allocated and freed as needed from the
	* blocks available on the pool, though they can be preferentially
	* allocated from a dedicated "log" vdev.
	*/

	/*
	* This controls the amount of time that a ZIL block (lwb) will remain
	* "open" when it isn't "full", and it has a thread waiting for it to be
	* committed to stable storage. Please refer to the zil_commit_waiter()
	* function (and the comments within it) for more details.
	*/
	int zfs_commit_timeout_pct = 5;

	/*
	* See zil.h for more information about these fields.
	*/
	zil_stats_t zil_stats = {
	{ "zil_commit_count", KSTAT_DATA_UINT64 },
	{ "zil_commit_writer_count", KSTAT_DATA_UINT64 },
	{ "zil_itx_count", KSTAT_DATA_UINT64 },
	{ "zil_itx_indirect_count", KSTAT_DATA_UINT64 },
	{ "zil_itx_indirect_bytes", KSTAT_DATA_UINT64 },
	{ "zil_itx_copied_count", KSTAT_DATA_UINT64 },
	{ "zil_itx_copied_bytes", KSTAT_DATA_UINT64 },
	{ "zil_itx_needcopy_count", KSTAT_DATA_UINT64 },
	{ "zil_itx_needcopy_bytes", KSTAT_DATA_UINT64 },
	{ "zil_itx_metaslab_normal_count", KSTAT_DATA_UINT64 },
	{ "zil_itx_metaslab_normal_bytes", KSTAT_DATA_UINT64 },
	{ "zil_itx_metaslab_slog_count", KSTAT_DATA_UINT64 },
	{ "zil_itx_metaslab_slog_bytes", KSTAT_DATA_UINT64 },
	};

	static kstat_t *zil_ksp;

	/*
	* Disable intent logging replay. This global ZIL switch affects all pools.
	*/
	int zil_replay_disable = 0;

	/*
	* Disable the DKIOCFLUSHWRITECACHE commands that are normally sent to
	* the disk(s) by the ZIL after an LWB write has completed. Setting this
	* will cause ZIL corruption on power loss if a volatile out-of-order
	* write cache is enabled.
	*/
	int zil_nocacheflush = 0;

	/*
	* Limit SLOG write size per commit executed with synchronous priority.
	* Any writes above that will be executed with lower (asynchronous) priority
	* to limit potential SLOG device abuse by single active ZIL writer.
	*/
	unsigned long zil_slog_bulk = 768 * 1024;

	static kmem_cache_t *zil_lwb_cache;
	static kmem_cache_t *zil_zcw_cache;

	#define LWB_EMPTY(lwb) ((BP_GET_LSIZE(&lwb->lwb_blk) - \
	sizeof (zil_chain_t)) == (lwb->lwb_sz - lwb->lwb_nused))

	static int
	zil_bp_compare(const void x1, const void x2)
	{
	const dva_t dva1 = &((zil_bp_node_t )x1)->zn_dva;
	const dva_t dva2 = &((zil_bp_node_t )x2)->zn_dva;

	int cmp = TREE_CMP(DVA_GET_VDEV(dva1), DVA_GET_VDEV(dva2));
	if (likely(cmp))
	return (cmp);

	return (TREE_CMP(DVA_GET_OFFSET(dva1), DVA_GET_OFFSET(dva2)));
	}

	static void
	zil_bp_tree_init(zilog_t *zilog)
	{
	avl_create(&zilog->zl_bp_tree, zil_bp_compare,
	sizeof (zil_bp_node_t), offsetof(zil_bp_node_t, zn_node));
	}

	static void
	zil_bp_tree_fini(zilog_t *zilog)
	{
	avl_tree_t *t = &zilog->zl_bp_tree;
	zil_bp_node_t *zn;
	void *cookie = NULL;

	while ((zn = avl_destroy_nodes(t, &cookie)) != NULL)
	kmem_free(zn, sizeof (zil_bp_node_t));

	avl_destroy(t);
	}

	int
	zil_bp_tree_add(zilog_t zilog, const blkptr_t bp)
	{
	avl_tree_t *t = &zilog->zl_bp_tree;
	const dva_t *dva;
	zil_bp_node_t *zn;
	avl_index_t where;

	if (BP_IS_EMBEDDED(bp))
	return (0);

	dva = BP_IDENTITY(bp);

	if (avl_find(t, dva, &where) != NULL)
	return (SET_ERROR(EEXIST));

	zn = kmem_alloc(sizeof (zil_bp_node_t), KM_SLEEP);
	zn->zn_dva = *dva;
	avl_insert(t, zn, where);

	return (0);
	}

	static zil_header_t *
	zil_header_in_syncing_context(zilog_t *zilog)
	{
	return ((zil_header_t *)zilog->zl_header);
	}

	static void
	zil_init_log_chain(zilog_t zilog, blkptr_t bp)
	{
	zio_cksum_t *zc = &bp->blk_cksum;

	- zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL);
	- zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL);
	+ (void) random_get_pseudo_bytes((void *)&zc->zc_word[ZIL_ZC_GUID_0],
	+ sizeof (zc->zc_word[ZIL_ZC_GUID_0]));
	+ (void) random_get_pseudo_bytes((void *)&zc->zc_word[ZIL_ZC_GUID_1],
	+ sizeof (zc->zc_word[ZIL_ZC_GUID_1]));
	zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os);
	zc->zc_word[ZIL_ZC_SEQ] = 1ULL;
	}

	/*
	* Read a log block and make sure it's valid.
	*/
	static int
	zil_read_log_block(zilog_t zilog, boolean_t decrypt, const blkptr_t bp,
	blkptr_t nbp, void dst, char **end)
	{
	enum zio_flag zio_flags = ZIO_FLAG_CANFAIL;
	arc_flags_t aflags = ARC_FLAG_WAIT;
	arc_buf_t *abuf = NULL;
	zbookmark_phys_t zb;
	int error;

	if (zilog->zl_header->zh_claim_txg == 0)
	zio_flags \|= ZIO_FLAG_SPECULATIVE \| ZIO_FLAG_SCRUB;

	if (!(zilog->zl_header->zh_flags & ZIL_CLAIM_LR_SEQ_VALID))
	zio_flags \|= ZIO_FLAG_SPECULATIVE;

	if (!decrypt)
	zio_flags \|= ZIO_FLAG_RAW;

	SET_BOOKMARK(&zb, bp->blk_cksum.zc_word[ZIL_ZC_OBJSET],
	ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]);

	error = arc_read(NULL, zilog->zl_spa, bp, arc_getbuf_func,
	&abuf, ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb);

	if (error == 0) {
	zio_cksum_t cksum = bp->blk_cksum;

	/*
	* Validate the checksummed log block.
	*
	* Sequence numbers should be... sequential. The checksum
	* verifier for the next block should be bp's checksum plus 1.
	*
	* Also check the log chain linkage and size used.
	*/
	cksum.zc_word[ZIL_ZC_SEQ]++;

	if (BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_ZILOG2) {
	zil_chain_t *zilc = abuf->b_data;
	char lr = (char )(zilc + 1);
	uint64_t len = zilc->zc_nused - sizeof (zil_chain_t);

	if (bcmp(&cksum, &zilc->zc_next_blk.blk_cksum,
	sizeof (cksum)) \|\| BP_IS_HOLE(&zilc->zc_next_blk)) {
	error = SET_ERROR(ECKSUM);
	} else {
	ASSERT3U(len, <=, SPA_OLD_MAXBLOCKSIZE);
	bcopy(lr, dst, len);
	end = (char )dst + len;
	*nbp = zilc->zc_next_blk;
	}
	} else {
	char *lr = abuf->b_data;
	uint64_t size = BP_GET_LSIZE(bp);
	zil_chain_t zilc = (zil_chain_t )(lr + size) - 1;

	if (bcmp(&cksum, &zilc->zc_next_blk.blk_cksum,
	sizeof (cksum)) \|\| BP_IS_HOLE(&zilc->zc_next_blk) \|\|
	(zilc->zc_nused > (size - sizeof (*zilc)))) {
	error = SET_ERROR(ECKSUM);
	} else {
	ASSERT3U(zilc->zc_nused, <=,
	SPA_OLD_MAXBLOCKSIZE);
	bcopy(lr, dst, zilc->zc_nused);
	end = (char )dst + zilc->zc_nused;
	*nbp = zilc->zc_next_blk;
	}
	}

	arc_buf_destroy(abuf, &abuf);
	}

	return (error);
	}

	/*
	* Read a TX_WRITE log data block.
	*/
	static int
	zil_read_log_data(zilog_t zilog, const lr_write_t lr, void *wbuf)
	{
	enum zio_flag zio_flags = ZIO_FLAG_CANFAIL;
	const blkptr_t *bp = &lr->lr_blkptr;
	arc_flags_t aflags = ARC_FLAG_WAIT;
	arc_buf_t *abuf = NULL;
	zbookmark_phys_t zb;
	int error;

	if (BP_IS_HOLE(bp)) {
	if (wbuf != NULL)
	bzero(wbuf, MAX(BP_GET_LSIZE(bp), lr->lr_length));
	return (0);
	}

	if (zilog->zl_header->zh_claim_txg == 0)
	zio_flags \|= ZIO_FLAG_SPECULATIVE \| ZIO_FLAG_SCRUB;

	/*
	* If we are not using the resulting data, we are just checking that
	* it hasn't been corrupted so we don't need to waste CPU time
	* decompressing and decrypting it.
	*/
	if (wbuf == NULL)
	zio_flags \|= ZIO_FLAG_RAW;

	SET_BOOKMARK(&zb, dmu_objset_id(zilog->zl_os), lr->lr_foid,
	ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp));

	error = arc_read(NULL, zilog->zl_spa, bp, arc_getbuf_func, &abuf,
	ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb);

	if (error == 0) {
	if (wbuf != NULL)
	bcopy(abuf->b_data, wbuf, arc_buf_size(abuf));
	arc_buf_destroy(abuf, &abuf);
	}

	return (error);
	}

	/*
	* Parse the intent log, and call parse_func for each valid record within.
	*/
	int
	zil_parse(zilog_t zilog, zil_parse_blk_func_t parse_blk_func,
	zil_parse_lr_func_t parse_lr_func, void arg, uint64_t txg,
	boolean_t decrypt)
	{
	const zil_header_t *zh = zilog->zl_header;
	boolean_t claimed = !!zh->zh_claim_txg;
	uint64_t claim_blk_seq = claimed ? zh->zh_claim_blk_seq : UINT64_MAX;
	uint64_t claim_lr_seq = claimed ? zh->zh_claim_lr_seq : UINT64_MAX;
	uint64_t max_blk_seq = 0;
	uint64_t max_lr_seq = 0;
	uint64_t blk_count = 0;
	uint64_t lr_count = 0;
	blkptr_t blk, next_blk;
	char lrbuf, lrp;
	int error = 0;

	bzero(&next_blk, sizeof (blkptr_t));

	/*
	* Old logs didn't record the maximum zh_claim_lr_seq.
	*/
	if (!(zh->zh_flags & ZIL_CLAIM_LR_SEQ_VALID))
	claim_lr_seq = UINT64_MAX;

	/*
	* Starting at the block pointed to by zh_log we read the log chain.
	* For each block in the chain we strongly check that block to
	* ensure its validity. We stop when an invalid block is found.
	* For each block pointer in the chain we call parse_blk_func().
	* For each record in each valid block we call parse_lr_func().
	* If the log has been claimed, stop if we encounter a sequence
	* number greater than the highest claimed sequence number.
	*/
	lrbuf = zio_buf_alloc(SPA_OLD_MAXBLOCKSIZE);
	zil_bp_tree_init(zilog);

	for (blk = zh->zh_log; !BP_IS_HOLE(&blk); blk = next_blk) {
	uint64_t blk_seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ];
	int reclen;
	char *end = NULL;

	if (blk_seq > claim_blk_seq)
	break;

	error = parse_blk_func(zilog, &blk, arg, txg);
	if (error != 0)
	break;
	ASSERT3U(max_blk_seq, <, blk_seq);
	max_blk_seq = blk_seq;
	blk_count++;

	if (max_lr_seq == claim_lr_seq && max_blk_seq == claim_blk_seq)
	break;

	error = zil_read_log_block(zilog, decrypt, &blk, &next_blk,
	lrbuf, &end);
	if (error != 0)
	break;

	for (lrp = lrbuf; lrp < end; lrp += reclen) {
	lr_t lr = (lr_t )lrp;
	reclen = lr->lrc_reclen;
	ASSERT3U(reclen, >=, sizeof (lr_t));
	if (lr->lrc_seq > claim_lr_seq)
	goto done;

	error = parse_lr_func(zilog, lr, arg, txg);
	if (error != 0)
	goto done;
	ASSERT3U(max_lr_seq, <, lr->lrc_seq);
	max_lr_seq = lr->lrc_seq;
	lr_count++;
	}
	}
	done:
	zilog->zl_parse_error = error;
	zilog->zl_parse_blk_seq = max_blk_seq;
	zilog->zl_parse_lr_seq = max_lr_seq;
	zilog->zl_parse_blk_count = blk_count;
	zilog->zl_parse_lr_count = lr_count;

	ASSERT(!claimed \|\| !(zh->zh_flags & ZIL_CLAIM_LR_SEQ_VALID) \|\|
	(max_blk_seq == claim_blk_seq && max_lr_seq == claim_lr_seq) \|\|
	(decrypt && error == EIO));

	zil_bp_tree_fini(zilog);
	zio_buf_free(lrbuf, SPA_OLD_MAXBLOCKSIZE);

	return (error);
	}

	/* ARGSUSED */
	static int
	zil_clear_log_block(zilog_t zilog, const blkptr_t bp, void *tx,
	uint64_t first_txg)
	{
	ASSERT(!BP_IS_HOLE(bp));

	/*
	* As we call this function from the context of a rewind to a
	* checkpoint, each ZIL block whose txg is later than the txg
	* that we rewind to is invalid. Thus, we return -1 so
	* zil_parse() doesn't attempt to read it.
	*/
	if (bp->blk_birth >= first_txg)
	return (-1);

	if (zil_bp_tree_add(zilog, bp) != 0)
	return (0);

	zio_free(zilog->zl_spa, first_txg, bp);
	return (0);
	}

	/* ARGSUSED */
	static int
	zil_noop_log_record(zilog_t zilog, const lr_t lrc, void *tx,
	uint64_t first_txg)
	{
	return (0);
	}

	static int
	zil_claim_log_block(zilog_t zilog, const blkptr_t bp, void *tx,
	uint64_t first_txg)
	{
	/*
	* Claim log block if not already committed and not already claimed.
	* If tx == NULL, just verify that the block is claimable.
	*/
	if (BP_IS_HOLE(bp) \|\| bp->blk_birth < first_txg \|\|
	zil_bp_tree_add(zilog, bp) != 0)
	return (0);

	return (zio_wait(zio_claim(NULL, zilog->zl_spa,
	tx == NULL ? 0 : first_txg, bp, spa_claim_notify, NULL,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE \| ZIO_FLAG_SCRUB)));
	}

	static int
	zil_claim_log_record(zilog_t zilog, const lr_t lrc, void *tx,
	uint64_t first_txg)
	{
	lr_write_t lr = (lr_write_t )lrc;
	int error;

	if (lrc->lrc_txtype != TX_WRITE)
	return (0);

	/*
	* If the block is not readable, don't claim it. This can happen
	* in normal operation when a log block is written to disk before
	* some of the dmu_sync() blocks it points to. In this case, the
	* transaction cannot have been committed to anyone (we would have
	* waited for all writes to be stable first), so it is semantically
	* correct to declare this the end of the log.
	*/
	if (lr->lr_blkptr.blk_birth >= first_txg) {
	error = zil_read_log_data(zilog, lr, NULL);
	if (error != 0)
	return (error);
	}

	return (zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg));
	}

	/* ARGSUSED */
	static int
	zil_free_log_block(zilog_t zilog, const blkptr_t bp, void *tx,
	uint64_t claim_txg)
	{
	zio_free(zilog->zl_spa, dmu_tx_get_txg(tx), bp);

	return (0);
	}

	static int
	zil_free_log_record(zilog_t zilog, const lr_t lrc, void *tx,
	uint64_t claim_txg)
	{
	lr_write_t lr = (lr_write_t )lrc;
	blkptr_t *bp = &lr->lr_blkptr;

	/*
	* If we previously claimed it, we need to free it.
	*/
	if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE &&
	bp->blk_birth >= claim_txg && zil_bp_tree_add(zilog, bp) == 0 &&
	!BP_IS_HOLE(bp))
	zio_free(zilog->zl_spa, dmu_tx_get_txg(tx), bp);

	return (0);
	}

	static int
	zil_lwb_vdev_compare(const void x1, const void x2)
	{
	const uint64_t v1 = ((zil_vdev_node_t *)x1)->zv_vdev;
	const uint64_t v2 = ((zil_vdev_node_t *)x2)->zv_vdev;

	return (TREE_CMP(v1, v2));
	}

	static lwb_t *
	zil_alloc_lwb(zilog_t zilog, blkptr_t bp, boolean_t slog, uint64_t txg,
	boolean_t fastwrite)
	{
	lwb_t *lwb;

	lwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP);
	lwb->lwb_zilog = zilog;
	lwb->lwb_blk = *bp;
	lwb->lwb_fastwrite = fastwrite;
	lwb->lwb_slog = slog;
	lwb->lwb_state = LWB_STATE_CLOSED;
	lwb->lwb_buf = zio_buf_alloc(BP_GET_LSIZE(bp));
	lwb->lwb_max_txg = txg;
	lwb->lwb_write_zio = NULL;
	lwb->lwb_root_zio = NULL;
	lwb->lwb_tx = NULL;
	lwb->lwb_issued_timestamp = 0;
	if (BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_ZILOG2) {
	lwb->lwb_nused = sizeof (zil_chain_t);
	lwb->lwb_sz = BP_GET_LSIZE(bp);
	} else {
	lwb->lwb_nused = 0;
	lwb->lwb_sz = BP_GET_LSIZE(bp) - sizeof (zil_chain_t);
	}

	mutex_enter(&zilog->zl_lock);
	list_insert_tail(&zilog->zl_lwb_list, lwb);
	mutex_exit(&zilog->zl_lock);

	ASSERT(!MUTEX_HELD(&lwb->lwb_vdev_lock));
	ASSERT(avl_is_empty(&lwb->lwb_vdev_tree));
	VERIFY(list_is_empty(&lwb->lwb_waiters));
	VERIFY(list_is_empty(&lwb->lwb_itxs));

	return (lwb);
	}

	static void
	zil_free_lwb(zilog_t zilog, lwb_t lwb)
	{
	ASSERT(MUTEX_HELD(&zilog->zl_lock));
	ASSERT(!MUTEX_HELD(&lwb->lwb_vdev_lock));
	VERIFY(list_is_empty(&lwb->lwb_waiters));
	VERIFY(list_is_empty(&lwb->lwb_itxs));
	ASSERT(avl_is_empty(&lwb->lwb_vdev_tree));
	ASSERT3P(lwb->lwb_write_zio, ==, NULL);
	ASSERT3P(lwb->lwb_root_zio, ==, NULL);
	ASSERT3U(lwb->lwb_max_txg, <=, spa_syncing_txg(zilog->zl_spa));
	ASSERT(lwb->lwb_state == LWB_STATE_CLOSED \|\|
	lwb->lwb_state == LWB_STATE_FLUSH_DONE);

	/*
	* Clear the zilog's field to indicate this lwb is no longer
	* valid, and prevent use-after-free errors.
	*/
	if (zilog->zl_last_lwb_opened == lwb)
	zilog->zl_last_lwb_opened = NULL;

	kmem_cache_free(zil_lwb_cache, lwb);
	}

	/*
	* Called when we create in-memory log transactions so that we know
	* to cleanup the itxs at the end of spa_sync().
	*/
	static void
	zilog_dirty(zilog_t *zilog, uint64_t txg)
	{
	dsl_pool_t *dp = zilog->zl_dmu_pool;
	dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os);

	ASSERT(spa_writeable(zilog->zl_spa));

	if (ds->ds_is_snapshot)
	panic("dirtying snapshot!");

	if (txg_list_add(&dp->dp_dirty_zilogs, zilog, txg)) {
	/* up the hold count until we can be written out */
	dmu_buf_add_ref(ds->ds_dbuf, zilog);

	zilog->zl_dirty_max_txg = MAX(txg, zilog->zl_dirty_max_txg);
	}
	}

	/*
	* Determine if the zil is dirty in the specified txg. Callers wanting to
	* ensure that the dirty state does not change must hold the itxg_lock for
	* the specified txg. Holding the lock will ensure that the zil cannot be
	* dirtied (zil_itx_assign) or cleaned (zil_clean) while we check its current
	* state.
	*/
	static boolean_t __maybe_unused
	zilog_is_dirty_in_txg(zilog_t *zilog, uint64_t txg)
	{
	dsl_pool_t *dp = zilog->zl_dmu_pool;

	if (txg_list_member(&dp->dp_dirty_zilogs, zilog, txg & TXG_MASK))
	return (B_TRUE);
	return (B_FALSE);
	}

	/*
	* Determine if the zil is dirty. The zil is considered dirty if it has
	* any pending itx records that have not been cleaned by zil_clean().
	*/
	static boolean_t
	zilog_is_dirty(zilog_t *zilog)
	{
	dsl_pool_t *dp = zilog->zl_dmu_pool;

	for (int t = 0; t < TXG_SIZE; t++) {
	if (txg_list_member(&dp->dp_dirty_zilogs, zilog, t))
	return (B_TRUE);
	}
	return (B_FALSE);
	}

	/*
	* Create an on-disk intent log.
	*/
	static lwb_t *
	zil_create(zilog_t *zilog)
	{
	const zil_header_t *zh = zilog->zl_header;
	lwb_t *lwb = NULL;
	uint64_t txg = 0;
	dmu_tx_t *tx = NULL;
	blkptr_t blk;
	int error = 0;
	boolean_t fastwrite = FALSE;
	boolean_t slog = FALSE;

	/*
	* Wait for any previous destroy to complete.
	*/
	txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);

	ASSERT(zh->zh_claim_txg == 0);
	ASSERT(zh->zh_replay_seq == 0);

	blk = zh->zh_log;

	/*
	* Allocate an initial log block if:
	* - there isn't one already
	* - the existing block is the wrong endianness
	*/
	if (BP_IS_HOLE(&blk) \|\| BP_SHOULD_BYTESWAP(&blk)) {
	tx = dmu_tx_create(zilog->zl_os);
	VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
	dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
	txg = dmu_tx_get_txg(tx);

	if (!BP_IS_HOLE(&blk)) {
	zio_free(zilog->zl_spa, txg, &blk);
	BP_ZERO(&blk);
	}

	error = zio_alloc_zil(zilog->zl_spa, zilog->zl_os, txg, &blk,
	ZIL_MIN_BLKSZ, &slog);
	fastwrite = TRUE;

	if (error == 0)
	zil_init_log_chain(zilog, &blk);
	}

	/*
	* Allocate a log write block (lwb) for the first log block.
	*/
	if (error == 0)
	lwb = zil_alloc_lwb(zilog, &blk, slog, txg, fastwrite);

	/*
	* If we just allocated the first log block, commit our transaction
	* and wait for zil_sync() to stuff the block pointer into zh_log.
	* (zh is part of the MOS, so we cannot modify it in open context.)
	*/
	if (tx != NULL) {
	dmu_tx_commit(tx);
	txg_wait_synced(zilog->zl_dmu_pool, txg);
	}

	ASSERT(error != 0 \|\| bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0);
	IMPLY(error == 0, lwb != NULL);

	return (lwb);
	}

	/*
	* In one tx, free all log blocks and clear the log header. If keep_first
	* is set, then we're replaying a log with no content. We want to keep the
	* first block, however, so that the first synchronous transaction doesn't
	* require a txg_wait_synced() in zil_create(). We don't need to
	* txg_wait_synced() here either when keep_first is set, because both
	* zil_create() and zil_destroy() will wait for any in-progress destroys
	* to complete.
	*/
	void
	zil_destroy(zilog_t *zilog, boolean_t keep_first)
	{
	const zil_header_t *zh = zilog->zl_header;
	lwb_t *lwb;
	dmu_tx_t *tx;
	uint64_t txg;

	/*
	* Wait for any previous destroy to complete.
	*/
	txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);

	zilog->zl_old_header = zh; / debugging aid */

	if (BP_IS_HOLE(&zh->zh_log))
	return;

	tx = dmu_tx_create(zilog->zl_os);
	VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
	dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
	txg = dmu_tx_get_txg(tx);

	mutex_enter(&zilog->zl_lock);

	ASSERT3U(zilog->zl_destroy_txg, <, txg);
	zilog->zl_destroy_txg = txg;
	zilog->zl_keep_first = keep_first;

	if (!list_is_empty(&zilog->zl_lwb_list)) {
	ASSERT(zh->zh_claim_txg == 0);
	VERIFY(!keep_first);
	while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
	if (lwb->lwb_fastwrite)
	metaslab_fastwrite_unmark(zilog->zl_spa,
	&lwb->lwb_blk);

	list_remove(&zilog->zl_lwb_list, lwb);
	if (lwb->lwb_buf != NULL)
	zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
	zio_free(zilog->zl_spa, txg, &lwb->lwb_blk);
	zil_free_lwb(zilog, lwb);
	}
	} else if (!keep_first) {
	zil_destroy_sync(zilog, tx);
	}
	mutex_exit(&zilog->zl_lock);

	dmu_tx_commit(tx);
	}

	void
	zil_destroy_sync(zilog_t zilog, dmu_tx_t tx)
	{
	ASSERT(list_is_empty(&zilog->zl_lwb_list));
	(void) zil_parse(zilog, zil_free_log_block,
	zil_free_log_record, tx, zilog->zl_header->zh_claim_txg, B_FALSE);
	}

	int
	zil_claim(dsl_pool_t dp, dsl_dataset_t ds, void *txarg)
	{
	dmu_tx_t *tx = txarg;
	zilog_t *zilog;
	uint64_t first_txg;
	zil_header_t *zh;
	objset_t *os;
	int error;

	error = dmu_objset_own_obj(dp, ds->ds_object,
	DMU_OST_ANY, B_FALSE, B_FALSE, FTAG, &os);
	if (error != 0) {
	/*
	* EBUSY indicates that the objset is inconsistent, in which
	* case it can not have a ZIL.
	*/
	if (error != EBUSY) {
	cmn_err(CE_WARN, "can't open objset for %llu, error %u",
	(unsigned long long)ds->ds_object, error);
	}

	return (0);
	}

	zilog = dmu_objset_zil(os);
	zh = zil_header_in_syncing_context(zilog);
	ASSERT3U(tx->tx_txg, ==, spa_first_txg(zilog->zl_spa));
	first_txg = spa_min_claim_txg(zilog->zl_spa);

	/*
	* If the spa_log_state is not set to be cleared, check whether
	* the current uberblock is a checkpoint one and if the current
	* header has been claimed before moving on.
	*
	* If the current uberblock is a checkpointed uberblock then
	* one of the following scenarios took place:
	*
	* 1] We are currently rewinding to the checkpoint of the pool.
	* 2] We crashed in the middle of a checkpoint rewind but we
	* did manage to write the checkpointed uberblock to the
	* vdev labels, so when we tried to import the pool again
	* the checkpointed uberblock was selected from the import
	* procedure.
	*
	* In both cases we want to zero out all the ZIL blocks, except
	* the ones that have been claimed at the time of the checkpoint
	* (their zh_claim_txg != 0). The reason is that these blocks
	* may be corrupted since we may have reused their locations on
	* disk after we took the checkpoint.
	*
	* We could try to set spa_log_state to SPA_LOG_CLEAR earlier
	* when we first figure out whether the current uberblock is
	* checkpointed or not. Unfortunately, that would discard all
	* the logs, including the ones that are claimed, and we would
	* leak space.
	*/
	if (spa_get_log_state(zilog->zl_spa) == SPA_LOG_CLEAR \|\|
	(zilog->zl_spa->spa_uberblock.ub_checkpoint_txg != 0 &&
	zh->zh_claim_txg == 0)) {
	if (!BP_IS_HOLE(&zh->zh_log)) {
	(void) zil_parse(zilog, zil_clear_log_block,
	zil_noop_log_record, tx, first_txg, B_FALSE);
	}
	BP_ZERO(&zh->zh_log);
	if (os->os_encrypted)
	os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
	dsl_dataset_dirty(dmu_objset_ds(os), tx);
	dmu_objset_disown(os, B_FALSE, FTAG);
	return (0);
	}

	/*
	* If we are not rewinding and opening the pool normally, then
	* the min_claim_txg should be equal to the first txg of the pool.
	*/
	ASSERT3U(first_txg, ==, spa_first_txg(zilog->zl_spa));

	/*
	* Claim all log blocks if we haven't already done so, and remember
	* the highest claimed sequence number. This ensures that if we can
	* read only part of the log now (e.g. due to a missing device),
	* but we can read the entire log later, we will not try to replay
	* or destroy beyond the last block we successfully claimed.
	*/
	ASSERT3U(zh->zh_claim_txg, <=, first_txg);
	if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) {
	(void) zil_parse(zilog, zil_claim_log_block,
	zil_claim_log_record, tx, first_txg, B_FALSE);
	zh->zh_claim_txg = first_txg;
	zh->zh_claim_blk_seq = zilog->zl_parse_blk_seq;
	zh->zh_claim_lr_seq = zilog->zl_parse_lr_seq;
	if (zilog->zl_parse_lr_count \|\| zilog->zl_parse_blk_count > 1)
	zh->zh_flags \|= ZIL_REPLAY_NEEDED;
	zh->zh_flags \|= ZIL_CLAIM_LR_SEQ_VALID;
	if (os->os_encrypted)
	os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
	dsl_dataset_dirty(dmu_objset_ds(os), tx);
	}

	ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1));
	dmu_objset_disown(os, B_FALSE, FTAG);
	return (0);
	}

	/*
	* Check the log by walking the log chain.
	* Checksum errors are ok as they indicate the end of the chain.
	* Any other error (no device or read failure) returns an error.
	*/
	/* ARGSUSED */
	int
	zil_check_log_chain(dsl_pool_t dp, dsl_dataset_t ds, void *tx)
	{
	zilog_t *zilog;
	objset_t *os;
	blkptr_t *bp;
	int error;

	ASSERT(tx == NULL);

	error = dmu_objset_from_ds(ds, &os);
	if (error != 0) {
	cmn_err(CE_WARN, "can't open objset %llu, error %d",
	(unsigned long long)ds->ds_object, error);
	return (0);
	}

	zilog = dmu_objset_zil(os);
	bp = (blkptr_t *)&zilog->zl_header->zh_log;

	if (!BP_IS_HOLE(bp)) {
	vdev_t *vd;
	boolean_t valid = B_TRUE;

	/*
	* Check the first block and determine if it's on a log device
	* which may have been removed or faulted prior to loading this
	* pool. If so, there's no point in checking the rest of the
	* log as its content should have already been synced to the
	* pool.
	*/
	spa_config_enter(os->os_spa, SCL_STATE, FTAG, RW_READER);
	vd = vdev_lookup_top(os->os_spa, DVA_GET_VDEV(&bp->blk_dva[0]));
	if (vd->vdev_islog && vdev_is_dead(vd))
	valid = vdev_log_state_valid(vd);
	spa_config_exit(os->os_spa, SCL_STATE, FTAG);

	if (!valid)
	return (0);

	/*
	* Check whether the current uberblock is checkpointed (e.g.
	* we are rewinding) and whether the current header has been
	* claimed or not. If it hasn't then skip verifying it. We
	* do this because its ZIL blocks may be part of the pool's
	* state before the rewind, which is no longer valid.
	*/
	zil_header_t *zh = zil_header_in_syncing_context(zilog);
	if (zilog->zl_spa->spa_uberblock.ub_checkpoint_txg != 0 &&
	zh->zh_claim_txg == 0)
	return (0);
	}

	/*
	* Because tx == NULL, zil_claim_log_block() will not actually claim
	* any blocks, but just determine whether it is possible to do so.
	* In addition to checking the log chain, zil_claim_log_block()
	* will invoke zio_claim() with a done func of spa_claim_notify(),
	* which will update spa_max_claim_txg. See spa_load() for details.
	*/
	error = zil_parse(zilog, zil_claim_log_block, zil_claim_log_record, tx,
	zilog->zl_header->zh_claim_txg ? -1ULL :
	spa_min_claim_txg(os->os_spa), B_FALSE);

	return ((error == ECKSUM \|\| error == ENOENT) ? 0 : error);
	}

	/*
	* When an itx is "skipped", this function is used to properly mark the
	* waiter as "done, and signal any thread(s) waiting on it. An itx can
	* be skipped (and not committed to an lwb) for a variety of reasons,
	* one of them being that the itx was committed via spa_sync(), prior to
	* it being committed to an lwb; this can happen if a thread calling
	* zil_commit() is racing with spa_sync().
	*/
	static void
	zil_commit_waiter_skip(zil_commit_waiter_t *zcw)
	{
	mutex_enter(&zcw->zcw_lock);
	ASSERT3B(zcw->zcw_done, ==, B_FALSE);
	zcw->zcw_done = B_TRUE;
	cv_broadcast(&zcw->zcw_cv);
	mutex_exit(&zcw->zcw_lock);
	}

	/*
	* This function is used when the given waiter is to be linked into an
	* lwb's "lwb_waiter" list; i.e. when the itx is committed to the lwb.
	* At this point, the waiter will no longer be referenced by the itx,
	* and instead, will be referenced by the lwb.
	*/
	static void
	zil_commit_waiter_link_lwb(zil_commit_waiter_t zcw, lwb_t lwb)
	{
	/*
	* The lwb_waiters field of the lwb is protected by the zilog's
	* zl_lock, thus it must be held when calling this function.
	*/
	ASSERT(MUTEX_HELD(&lwb->lwb_zilog->zl_lock));

	mutex_enter(&zcw->zcw_lock);
	ASSERT(!list_link_active(&zcw->zcw_node));
	ASSERT3P(zcw->zcw_lwb, ==, NULL);
	ASSERT3P(lwb, !=, NULL);
	ASSERT(lwb->lwb_state == LWB_STATE_OPENED \|\|
	lwb->lwb_state == LWB_STATE_ISSUED \|\|
	lwb->lwb_state == LWB_STATE_WRITE_DONE);

	list_insert_tail(&lwb->lwb_waiters, zcw);
	zcw->zcw_lwb = lwb;
	mutex_exit(&zcw->zcw_lock);
	}

	/*
	* This function is used when zio_alloc_zil() fails to allocate a ZIL
	* block, and the given waiter must be linked to the "nolwb waiters"
	* list inside of zil_process_commit_list().
	*/
	static void
	zil_commit_waiter_link_nolwb(zil_commit_waiter_t zcw, list_t nolwb)
	{
	mutex_enter(&zcw->zcw_lock);
	ASSERT(!list_link_active(&zcw->zcw_node));
	ASSERT3P(zcw->zcw_lwb, ==, NULL);
	list_insert_tail(nolwb, zcw);
	mutex_exit(&zcw->zcw_lock);
	}

	void
	zil_lwb_add_block(lwb_t lwb, const blkptr_t bp)
	{
	avl_tree_t *t = &lwb->lwb_vdev_tree;
	avl_index_t where;
	zil_vdev_node_t *zv, zvsearch;
	int ndvas = BP_GET_NDVAS(bp);
	int i;

	if (zil_nocacheflush)
	return;

	mutex_enter(&lwb->lwb_vdev_lock);
	for (i = 0; i < ndvas; i++) {
	zvsearch.zv_vdev = DVA_GET_VDEV(&bp->blk_dva[i]);
	if (avl_find(t, &zvsearch, &where) == NULL) {
	zv = kmem_alloc(sizeof (*zv), KM_SLEEP);
	zv->zv_vdev = zvsearch.zv_vdev;
	avl_insert(t, zv, where);
	}
	}
	mutex_exit(&lwb->lwb_vdev_lock);
	}

	static void
	zil_lwb_flush_defer(lwb_t lwb, lwb_t nlwb)
	{
	avl_tree_t *src = &lwb->lwb_vdev_tree;
	avl_tree_t *dst = &nlwb->lwb_vdev_tree;
	void *cookie = NULL;
	zil_vdev_node_t *zv;

	ASSERT3S(lwb->lwb_state, ==, LWB_STATE_WRITE_DONE);
	ASSERT3S(nlwb->lwb_state, !=, LWB_STATE_WRITE_DONE);
	ASSERT3S(nlwb->lwb_state, !=, LWB_STATE_FLUSH_DONE);

	/*
	* While 'lwb' is at a point in its lifetime where lwb_vdev_tree does
	* not need the protection of lwb_vdev_lock (it will only be modified
	* while holding zilog->zl_lock) as its writes and those of its
	* children have all completed. The younger 'nlwb' may be waiting on
	* future writes to additional vdevs.
	*/
	mutex_enter(&nlwb->lwb_vdev_lock);
	/*
	* Tear down the 'lwb' vdev tree, ensuring that entries which do not
	* exist in 'nlwb' are moved to it, freeing any would-be duplicates.
	*/
	while ((zv = avl_destroy_nodes(src, &cookie)) != NULL) {
	avl_index_t where;

	if (avl_find(dst, zv, &where) == NULL) {
	avl_insert(dst, zv, where);
	} else {
	kmem_free(zv, sizeof (*zv));
	}
	}
	mutex_exit(&nlwb->lwb_vdev_lock);
	}

	void
	zil_lwb_add_txg(lwb_t *lwb, uint64_t txg)
	{
	lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg);
	}

	/*
	* This function is a called after all vdevs associated with a given lwb
	* write have completed their DKIOCFLUSHWRITECACHE command; or as soon
	* as the lwb write completes, if "zil_nocacheflush" is set. Further,
	* all "previous" lwb's will have completed before this function is
	* called; i.e. this function is called for all previous lwbs before
	* it's called for "this" lwb (enforced via zio the dependencies
	* configured in zil_lwb_set_zio_dependency()).
	*
	* The intention is for this function to be called as soon as the
	* contents of an lwb are considered "stable" on disk, and will survive
	* any sudden loss of power. At this point, any threads waiting for the
	* lwb to reach this state are signalled, and the "waiter" structures
	* are marked "done".
	*/
	static void
	zil_lwb_flush_vdevs_done(zio_t *zio)
	{
	lwb_t *lwb = zio->io_private;
	zilog_t *zilog = lwb->lwb_zilog;
	dmu_tx_t *tx = lwb->lwb_tx;
	zil_commit_waiter_t *zcw;
	itx_t *itx;

	spa_config_exit(zilog->zl_spa, SCL_STATE, lwb);

	zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);

	mutex_enter(&zilog->zl_lock);

	/*
	* Ensure the lwb buffer pointer is cleared before releasing the
	* txg. If we have had an allocation failure and the txg is
	* waiting to sync then we want zil_sync() to remove the lwb so
	* that it's not picked up as the next new one in
	* zil_process_commit_list(). zil_sync() will only remove the
	* lwb if lwb_buf is null.
	*/
	lwb->lwb_buf = NULL;
	lwb->lwb_tx = NULL;

	ASSERT3U(lwb->lwb_issued_timestamp, >, 0);
	zilog->zl_last_lwb_latency = gethrtime() - lwb->lwb_issued_timestamp;

	lwb->lwb_root_zio = NULL;

	ASSERT3S(lwb->lwb_state, ==, LWB_STATE_WRITE_DONE);
	lwb->lwb_state = LWB_STATE_FLUSH_DONE;

	if (zilog->zl_last_lwb_opened == lwb) {
	/*
	* Remember the highest committed log sequence number
	* for ztest. We only update this value when all the log
	* writes succeeded, because ztest wants to ASSERT that
	* it got the whole log chain.
	*/
	zilog->zl_commit_lr_seq = zilog->zl_lr_seq;
	}

	while ((itx = list_head(&lwb->lwb_itxs)) != NULL) {
	list_remove(&lwb->lwb_itxs, itx);
	zil_itx_destroy(itx);
	}

	while ((zcw = list_head(&lwb->lwb_waiters)) != NULL) {
	mutex_enter(&zcw->zcw_lock);

	ASSERT(list_link_active(&zcw->zcw_node));
	list_remove(&lwb->lwb_waiters, zcw);

	ASSERT3P(zcw->zcw_lwb, ==, lwb);
	zcw->zcw_lwb = NULL;
	+ /*
	+ * We expect any ZIO errors from child ZIOs to have been
	+ * propagated "up" to this specific LWB's root ZIO, in
	+ * order for this error handling to work correctly. This
	+ * includes ZIO errors from either this LWB's write or
	+ * flush, as well as any errors from other dependent LWBs
	+ * (e.g. a root LWB ZIO that might be a child of this LWB).
	+ *
	+ * With that said, it's important to note that LWB flush
	+ * errors are not propagated up to the LWB root ZIO.
	+ * This is incorrect behavior, and results in VDEV flush
	+ * errors not being handled correctly here. See the
	+ * comment above the call to "zio_flush" for details.
	+ */

	zcw->zcw_zio_error = zio->io_error;

	ASSERT3B(zcw->zcw_done, ==, B_FALSE);
	zcw->zcw_done = B_TRUE;
	cv_broadcast(&zcw->zcw_cv);

	mutex_exit(&zcw->zcw_lock);
	}

	mutex_exit(&zilog->zl_lock);

	/*
	* Now that we've written this log block, we have a stable pointer
	* to the next block in the chain, so it's OK to let the txg in
	* which we allocated the next block sync.
	*/
	dmu_tx_commit(tx);
	}

	/*
	* This is called when an lwb's write zio completes. The callback's
	* purpose is to issue the DKIOCFLUSHWRITECACHE commands for the vdevs
	* in the lwb's lwb_vdev_tree. The tree will contain the vdevs involved
	* in writing out this specific lwb's data, and in the case that cache
	* flushes have been deferred, vdevs involved in writing the data for
	* previous lwbs. The writes corresponding to all the vdevs in the
	* lwb_vdev_tree will have completed by the time this is called, due to
	* the zio dependencies configured in zil_lwb_set_zio_dependency(),
	* which takes deferred flushes into account. The lwb will be "done"
	* once zil_lwb_flush_vdevs_done() is called, which occurs in the zio
	* completion callback for the lwb's root zio.
	*/
	static void
	zil_lwb_write_done(zio_t *zio)
	{
	lwb_t *lwb = zio->io_private;
	spa_t *spa = zio->io_spa;
	zilog_t *zilog = lwb->lwb_zilog;
	avl_tree_t *t = &lwb->lwb_vdev_tree;
	void *cookie = NULL;
	zil_vdev_node_t *zv;
	lwb_t *nlwb;

	ASSERT3S(spa_config_held(spa, SCL_STATE, RW_READER), !=, 0);

	ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF);
	ASSERT(BP_GET_TYPE(zio->io_bp) == DMU_OT_INTENT_LOG);
	ASSERT(BP_GET_LEVEL(zio->io_bp) == 0);
	ASSERT(BP_GET_BYTEORDER(zio->io_bp) == ZFS_HOST_BYTEORDER);
	ASSERT(!BP_IS_GANG(zio->io_bp));
	ASSERT(!BP_IS_HOLE(zio->io_bp));
	ASSERT(BP_GET_FILL(zio->io_bp) == 0);

	abd_free(zio->io_abd);

	mutex_enter(&zilog->zl_lock);
	ASSERT3S(lwb->lwb_state, ==, LWB_STATE_ISSUED);
	lwb->lwb_state = LWB_STATE_WRITE_DONE;
	lwb->lwb_write_zio = NULL;
	lwb->lwb_fastwrite = FALSE;
	nlwb = list_next(&zilog->zl_lwb_list, lwb);
	mutex_exit(&zilog->zl_lock);

	if (avl_numnodes(t) == 0)
	return;

	/*
	* If there was an IO error, we're not going to call zio_flush()
	* on these vdevs, so we simply empty the tree and free the
	* nodes. We avoid calling zio_flush() since there isn't any
	* good reason for doing so, after the lwb block failed to be
	* written out.
	+ *
	+ * Additionally, we don't perform any further error handling at
	+ * this point (e.g. setting "zcw_zio_error" appropriately), as
	+ * we expect that to occur in "zil_lwb_flush_vdevs_done" (thus,
	+ * we expect any error seen here, to have been propagated to
	+ * that function).
	*/
	if (zio->io_error != 0) {
	while ((zv = avl_destroy_nodes(t, &cookie)) != NULL)
	kmem_free(zv, sizeof (*zv));
	return;
	}

	/*
	* If this lwb does not have any threads waiting for it to
	* complete, we want to defer issuing the DKIOCFLUSHWRITECACHE
	* command to the vdevs written to by "this" lwb, and instead
	* rely on the "next" lwb to handle the DKIOCFLUSHWRITECACHE
	* command for those vdevs. Thus, we merge the vdev tree of
	* "this" lwb with the vdev tree of the "next" lwb in the list,
	* and assume the "next" lwb will handle flushing the vdevs (or
	* deferring the flush(s) again).
	*
	* This is a useful performance optimization, especially for
	* workloads with lots of async write activity and few sync
	* write and/or fsync activity, as it has the potential to
	* coalesce multiple flush commands to a vdev into one.
	*/
	if (list_head(&lwb->lwb_waiters) == NULL && nlwb != NULL) {
	zil_lwb_flush_defer(lwb, nlwb);
	ASSERT(avl_is_empty(&lwb->lwb_vdev_tree));
	return;
	}

	while ((zv = avl_destroy_nodes(t, &cookie)) != NULL) {
	vdev_t *vd = vdev_lookup_top(spa, zv->zv_vdev);
	- if (vd != NULL)
	+ if (vd != NULL) {
	+ /*
	+ * The "ZIO_FLAG_DONT_PROPAGATE" is currently
	+ * always used within "zio_flush". This means,
	+ * any errors when flushing the vdev(s), will
	+ * (unfortunately) not be handled correctly,
	+ * since these "zio_flush" errors will not be
	+ * propagated up to "zil_lwb_flush_vdevs_done".
	+ */
	zio_flush(lwb->lwb_root_zio, vd);
	+ }
	kmem_free(zv, sizeof (*zv));
	}
	}

	static void
	zil_lwb_set_zio_dependency(zilog_t zilog, lwb_t lwb)
	{
	lwb_t *last_lwb_opened = zilog->zl_last_lwb_opened;

	ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));
	ASSERT(MUTEX_HELD(&zilog->zl_lock));

	/*
	* The zilog's "zl_last_lwb_opened" field is used to build the
	* lwb/zio dependency chain, which is used to preserve the
	* ordering of lwb completions that is required by the semantics
	* of the ZIL. Each new lwb zio becomes a parent of the
	* "previous" lwb zio, such that the new lwb's zio cannot
	* complete until the "previous" lwb's zio completes.
	*
	* This is required by the semantics of zil_commit(); the commit
	* waiters attached to the lwbs will be woken in the lwb zio's
	* completion callback, so this zio dependency graph ensures the
	* waiters are woken in the correct order (the same order the
	* lwbs were created).
	*/
	if (last_lwb_opened != NULL &&
	last_lwb_opened->lwb_state != LWB_STATE_FLUSH_DONE) {
	ASSERT(last_lwb_opened->lwb_state == LWB_STATE_OPENED \|\|
	last_lwb_opened->lwb_state == LWB_STATE_ISSUED \|\|
	last_lwb_opened->lwb_state == LWB_STATE_WRITE_DONE);

	ASSERT3P(last_lwb_opened->lwb_root_zio, !=, NULL);
	zio_add_child(lwb->lwb_root_zio,
	last_lwb_opened->lwb_root_zio);

	/*
	* If the previous lwb's write hasn't already completed,
	* we also want to order the completion of the lwb write
	* zios (above, we only order the completion of the lwb
	* root zios). This is required because of how we can
	* defer the DKIOCFLUSHWRITECACHE commands for each lwb.
	*
	* When the DKIOCFLUSHWRITECACHE commands are deferred,
	* the previous lwb will rely on this lwb to flush the
	* vdevs written to by that previous lwb. Thus, we need
	* to ensure this lwb doesn't issue the flush until
	* after the previous lwb's write completes. We ensure
	* this ordering by setting the zio parent/child
	* relationship here.
	*
	* Without this relationship on the lwb's write zio,
	* it's possible for this lwb's write to complete prior
	* to the previous lwb's write completing; and thus, the
	* vdevs for the previous lwb would be flushed prior to
	* that lwb's data being written to those vdevs (the
	* vdevs are flushed in the lwb write zio's completion
	* handler, zil_lwb_write_done()).
	*/
	if (last_lwb_opened->lwb_state != LWB_STATE_WRITE_DONE) {
	ASSERT(last_lwb_opened->lwb_state == LWB_STATE_OPENED \|\|
	last_lwb_opened->lwb_state == LWB_STATE_ISSUED);

	ASSERT3P(last_lwb_opened->lwb_write_zio, !=, NULL);
	zio_add_child(lwb->lwb_write_zio,
	last_lwb_opened->lwb_write_zio);
	}
	}
	}


	/*
	* This function's purpose is to "open" an lwb such that it is ready to
	* accept new itxs being committed to it. To do this, the lwb's zio
	* structures are created, and linked to the lwb. This function is
	* idempotent; if the passed in lwb has already been opened, this
	* function is essentially a no-op.
	*/
	static void
	zil_lwb_write_open(zilog_t zilog, lwb_t lwb)
	{
	zbookmark_phys_t zb;
	zio_priority_t prio;

	ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));
	ASSERT3P(lwb, !=, NULL);
	EQUIV(lwb->lwb_root_zio == NULL, lwb->lwb_state == LWB_STATE_CLOSED);
	EQUIV(lwb->lwb_root_zio != NULL, lwb->lwb_state == LWB_STATE_OPENED);

	SET_BOOKMARK(&zb, lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET],
	ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
	lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]);

	/* Lock so zil_sync() doesn't fastwrite_unmark after zio is created */
	mutex_enter(&zilog->zl_lock);
	if (lwb->lwb_root_zio == NULL) {
	abd_t *lwb_abd = abd_get_from_buf(lwb->lwb_buf,
	BP_GET_LSIZE(&lwb->lwb_blk));

	if (!lwb->lwb_fastwrite) {
	metaslab_fastwrite_mark(zilog->zl_spa, &lwb->lwb_blk);
	lwb->lwb_fastwrite = 1;
	}

	if (!lwb->lwb_slog \|\| zilog->zl_cur_used <= zil_slog_bulk)
	prio = ZIO_PRIORITY_SYNC_WRITE;
	else
	prio = ZIO_PRIORITY_ASYNC_WRITE;

	lwb->lwb_root_zio = zio_root(zilog->zl_spa,
	zil_lwb_flush_vdevs_done, lwb, ZIO_FLAG_CANFAIL);
	ASSERT3P(lwb->lwb_root_zio, !=, NULL);

	lwb->lwb_write_zio = zio_rewrite(lwb->lwb_root_zio,
	zilog->zl_spa, 0, &lwb->lwb_blk, lwb_abd,
	BP_GET_LSIZE(&lwb->lwb_blk), zil_lwb_write_done, lwb,
	- prio, ZIO_FLAG_CANFAIL \| ZIO_FLAG_DONT_PROPAGATE \|
	- ZIO_FLAG_FASTWRITE, &zb);
	+ prio, ZIO_FLAG_CANFAIL \| ZIO_FLAG_FASTWRITE, &zb);
	ASSERT3P(lwb->lwb_write_zio, !=, NULL);

	lwb->lwb_state = LWB_STATE_OPENED;

	zil_lwb_set_zio_dependency(zilog, lwb);
	zilog->zl_last_lwb_opened = lwb;
	}
	mutex_exit(&zilog->zl_lock);

	ASSERT3P(lwb->lwb_root_zio, !=, NULL);
	ASSERT3P(lwb->lwb_write_zio, !=, NULL);
	ASSERT3S(lwb->lwb_state, ==, LWB_STATE_OPENED);
	}

	/*
	* Define a limited set of intent log block sizes.
	*
	* These must be a multiple of 4KB. Note only the amount used (again
	* aligned to 4KB) actually gets written. However, we can't always just
	* allocate SPA_OLD_MAXBLOCKSIZE as the slog space could be exhausted.
	*/
	struct {
	uint64_t limit;
	uint64_t blksz;
	} zil_block_buckets[] = {
	{ 4096, 4096 }, /* non TX_WRITE */
	{ 8192 + 4096, 8192 + 4096 }, /* database */
	{ 32768 + 4096, 32768 + 4096 }, /* NFS writes */
	{ 65536 + 4096, 65536 + 4096 }, /* 64KB writes */
	{ 131072, 131072 }, /* < 128KB writes */
	{ 131072 +4096, 65536 + 4096 }, /* 128KB writes */
	{ UINT64_MAX, SPA_OLD_MAXBLOCKSIZE}, /* > 128KB writes */
	};

	/*
	* Maximum block size used by the ZIL. This is picked up when the ZIL is
	* initialized. Otherwise this should not be used directly; see
	* zl_max_block_size instead.
	*/
	int zil_maxblocksize = SPA_OLD_MAXBLOCKSIZE;

	/*
	* Start a log block write and advance to the next log block.
	* Calls are serialized.
	*/
	static lwb_t *
	zil_lwb_write_issue(zilog_t zilog, lwb_t lwb)
	{
	lwb_t *nlwb = NULL;
	zil_chain_t *zilc;
	spa_t *spa = zilog->zl_spa;
	blkptr_t *bp;
	dmu_tx_t *tx;
	uint64_t txg;
	uint64_t zil_blksz, wsz;
	int i, error;
	boolean_t slog;

	ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));
	ASSERT3P(lwb->lwb_root_zio, !=, NULL);
	ASSERT3P(lwb->lwb_write_zio, !=, NULL);
	ASSERT3S(lwb->lwb_state, ==, LWB_STATE_OPENED);

	if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) {
	zilc = (zil_chain_t *)lwb->lwb_buf;
	bp = &zilc->zc_next_blk;
	} else {
	zilc = (zil_chain_t *)(lwb->lwb_buf + lwb->lwb_sz);
	bp = &zilc->zc_next_blk;
	}

	ASSERT(lwb->lwb_nused <= lwb->lwb_sz);

	/*
	* Allocate the next block and save its address in this block
	* before writing it in order to establish the log chain.
	* Note that if the allocation of nlwb synced before we wrote
	* the block that points at it (lwb), we'd leak it if we crashed.
	* Therefore, we don't do dmu_tx_commit() until zil_lwb_write_done().
	* We dirty the dataset to ensure that zil_sync() will be called
	* to clean up in the event of allocation failure or I/O failure.
	*/

	tx = dmu_tx_create(zilog->zl_os);

	/*
	* Since we are not going to create any new dirty data, and we
	* can even help with clearing the existing dirty data, we
	* should not be subject to the dirty data based delays. We
	* use TXG_NOTHROTTLE to bypass the delay mechanism.
	*/
	VERIFY0(dmu_tx_assign(tx, TXG_WAIT \| TXG_NOTHROTTLE));

	dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
	txg = dmu_tx_get_txg(tx);

	lwb->lwb_tx = tx;

	/*
	* Log blocks are pre-allocated. Here we select the size of the next
	* block, based on size used in the last block.
	* - first find the smallest bucket that will fit the block from a
	* limited set of block sizes. This is because it's faster to write
	* blocks allocated from the same metaslab as they are adjacent or
	* close.
	* - next find the maximum from the new suggested size and an array of
	* previous sizes. This lessens a picket fence effect of wrongly
	* guessing the size if we have a stream of say 2k, 64k, 2k, 64k
	* requests.
	*
	* Note we only write what is used, but we can't just allocate
	* the maximum block size because we can exhaust the available
	* pool log space.
	*/
	zil_blksz = zilog->zl_cur_used + sizeof (zil_chain_t);
	for (i = 0; zil_blksz > zil_block_buckets[i].limit; i++)
	continue;
	zil_blksz = MIN(zil_block_buckets[i].blksz, zilog->zl_max_block_size);
	zilog->zl_prev_blks[zilog->zl_prev_rotor] = zil_blksz;
	for (i = 0; i < ZIL_PREV_BLKS; i++)
	zil_blksz = MAX(zil_blksz, zilog->zl_prev_blks[i]);
	zilog->zl_prev_rotor = (zilog->zl_prev_rotor + 1) & (ZIL_PREV_BLKS - 1);

	BP_ZERO(bp);
	error = zio_alloc_zil(spa, zilog->zl_os, txg, bp, zil_blksz, &slog);
	if (slog) {
	ZIL_STAT_BUMP(zil_itx_metaslab_slog_count);
	ZIL_STAT_INCR(zil_itx_metaslab_slog_bytes, lwb->lwb_nused);
	} else {
	ZIL_STAT_BUMP(zil_itx_metaslab_normal_count);
	ZIL_STAT_INCR(zil_itx_metaslab_normal_bytes, lwb->lwb_nused);
	}
	if (error == 0) {
	ASSERT3U(bp->blk_birth, ==, txg);
	bp->blk_cksum = lwb->lwb_blk.blk_cksum;
	bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++;

	/*
	* Allocate a new log write block (lwb).
	*/
	nlwb = zil_alloc_lwb(zilog, bp, slog, txg, TRUE);
	}

	if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) {
	/* For Slim ZIL only write what is used. */
	wsz = P2ROUNDUP_TYPED(lwb->lwb_nused, ZIL_MIN_BLKSZ, uint64_t);
	ASSERT3U(wsz, <=, lwb->lwb_sz);
	zio_shrink(lwb->lwb_write_zio, wsz);

	} else {
	wsz = lwb->lwb_sz;
	}

	zilc->zc_pad = 0;
	zilc->zc_nused = lwb->lwb_nused;
	zilc->zc_eck.zec_cksum = lwb->lwb_blk.blk_cksum;

	/*
	* clear unused data for security
	*/
	bzero(lwb->lwb_buf + lwb->lwb_nused, wsz - lwb->lwb_nused);

	spa_config_enter(zilog->zl_spa, SCL_STATE, lwb, RW_READER);

	zil_lwb_add_block(lwb, &lwb->lwb_blk);
	lwb->lwb_issued_timestamp = gethrtime();
	lwb->lwb_state = LWB_STATE_ISSUED;

	zio_nowait(lwb->lwb_root_zio);
	zio_nowait(lwb->lwb_write_zio);

	/*
	* If there was an allocation failure then nlwb will be null which
	* forces a txg_wait_synced().
	*/
	return (nlwb);
	}

	/*
	* Maximum amount of write data that can be put into single log block.
	*/
	uint64_t
	zil_max_log_data(zilog_t *zilog)
	{
	return (zilog->zl_max_block_size -
	sizeof (zil_chain_t) - sizeof (lr_write_t));
	}

	/*
	* Maximum amount of log space we agree to waste to reduce number of
	* WR_NEED_COPY chunks to reduce zl_get_data() overhead (~12%).
	*/
	static inline uint64_t
	zil_max_waste_space(zilog_t *zilog)
	{
	return (zil_max_log_data(zilog) / 8);
	}

	/*
	* Maximum amount of write data for WR_COPIED. For correctness, consumers
	* must fall back to WR_NEED_COPY if we can't fit the entire record into one
	* maximum sized log block, because each WR_COPIED record must fit in a
	* single log block. For space efficiency, we want to fit two records into a
	* max-sized log block.
	*/
	uint64_t
	zil_max_copied_data(zilog_t *zilog)
	{
	return ((zilog->zl_max_block_size - sizeof (zil_chain_t)) / 2 -
	sizeof (lr_write_t));
	}

	static lwb_t *
	zil_lwb_commit(zilog_t zilog, itx_t itx, lwb_t *lwb)
	{
	lr_t lrcb, lrc;
	lr_write_t lrwb, lrw;
	char *lr_buf;
	- uint64_t dlen, dnow, lwb_sp, reclen, txg, max_log_data;
	+ uint64_t dlen, dnow, dpad, lwb_sp, reclen, txg, max_log_data;

	ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));
	ASSERT3P(lwb, !=, NULL);
	ASSERT3P(lwb->lwb_buf, !=, NULL);

	zil_lwb_write_open(zilog, lwb);

	lrc = &itx->itx_lr;
	lrw = (lr_write_t *)lrc;

	/*
	* A commit itx doesn't represent any on-disk state; instead
	* it's simply used as a place holder on the commit list, and
	* provides a mechanism for attaching a "commit waiter" onto the
	* correct lwb (such that the waiter can be signalled upon
	* completion of that lwb). Thus, we don't process this itx's
	* log record if it's a commit itx (these itx's don't have log
	* records), and instead link the itx's waiter onto the lwb's
	* list of waiters.
	*
	* For more details, see the comment above zil_commit().
	*/
	if (lrc->lrc_txtype == TX_COMMIT) {
	mutex_enter(&zilog->zl_lock);
	zil_commit_waiter_link_lwb(itx->itx_private, lwb);
	itx->itx_private = NULL;
	mutex_exit(&zilog->zl_lock);
	return (lwb);
	}

	if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY) {
	dlen = P2ROUNDUP_TYPED(
	lrw->lr_length, sizeof (uint64_t), uint64_t);
	+ dpad = dlen - lrw->lr_length;
	} else {
	- dlen = 0;
	+ dlen = dpad = 0;
	}
	reclen = lrc->lrc_reclen;
	zilog->zl_cur_used += (reclen + dlen);
	txg = lrc->lrc_txg;

	ASSERT3U(zilog->zl_cur_used, <, UINT64_MAX - (reclen + dlen));

	cont:
	/*
	* If this record won't fit in the current log block, start a new one.
	* For WR_NEED_COPY optimize layout for minimal number of chunks.
	*/
	lwb_sp = lwb->lwb_sz - lwb->lwb_nused;
	max_log_data = zil_max_log_data(zilog);
	if (reclen > lwb_sp \|\| (reclen + dlen > lwb_sp &&
	lwb_sp < zil_max_waste_space(zilog) &&
	(dlen % max_log_data == 0 \|\|
	lwb_sp < reclen + dlen % max_log_data))) {
	lwb = zil_lwb_write_issue(zilog, lwb);
	if (lwb == NULL)
	return (NULL);
	zil_lwb_write_open(zilog, lwb);
	ASSERT(LWB_EMPTY(lwb));
	lwb_sp = lwb->lwb_sz - lwb->lwb_nused;

	/*
	* There must be enough space in the new, empty log block to
	* hold reclen. For WR_COPIED, we need to fit the whole
	* record in one block, and reclen is the header size + the
	* data size. For WR_NEED_COPY, we can create multiple
	* records, splitting the data into multiple blocks, so we
	* only need to fit one word of data per block; in this case
	* reclen is just the header size (no data).
	*/
	ASSERT3U(reclen + MIN(dlen, sizeof (uint64_t)), <=, lwb_sp);
	}

	dnow = MIN(dlen, lwb_sp - reclen);
	lr_buf = lwb->lwb_buf + lwb->lwb_nused;
	bcopy(lrc, lr_buf, reclen);
	lrcb = (lr_t )lr_buf; / Like lrc, but inside lwb. */
	lrwb = (lr_write_t )lrcb; / Like lrw, but inside lwb. */

	ZIL_STAT_BUMP(zil_itx_count);

	/*
	* If it's a write, fetch the data or get its blkptr as appropriate.
	*/
	if (lrc->lrc_txtype == TX_WRITE) {
	if (txg > spa_freeze_txg(zilog->zl_spa))
	txg_wait_synced(zilog->zl_dmu_pool, txg);
	if (itx->itx_wr_state == WR_COPIED) {
	ZIL_STAT_BUMP(zil_itx_copied_count);
	ZIL_STAT_INCR(zil_itx_copied_bytes, lrw->lr_length);
	} else {
	char *dbuf;
	int error;

	if (itx->itx_wr_state == WR_NEED_COPY) {
	dbuf = lr_buf + reclen;
	lrcb->lrc_reclen += dnow;
	if (lrwb->lr_length > dnow)
	lrwb->lr_length = dnow;
	lrw->lr_offset += dnow;
	lrw->lr_length -= dnow;
	ZIL_STAT_BUMP(zil_itx_needcopy_count);
	ZIL_STAT_INCR(zil_itx_needcopy_bytes, dnow);
	} else {
	ASSERT3S(itx->itx_wr_state, ==, WR_INDIRECT);
	dbuf = NULL;
	ZIL_STAT_BUMP(zil_itx_indirect_count);
	ZIL_STAT_INCR(zil_itx_indirect_bytes,
	lrw->lr_length);
	}

	/*
	* We pass in the "lwb_write_zio" rather than
	* "lwb_root_zio" so that the "lwb_write_zio"
	* becomes the parent of any zio's created by
	* the "zl_get_data" callback. The vdevs are
	* flushed after the "lwb_write_zio" completes,
	* so we want to make sure that completion
	* callback waits for these additional zio's,
	* such that the vdevs used by those zio's will
	* be included in the lwb's vdev tree, and those
	* vdevs will be properly flushed. If we passed
	* in "lwb_root_zio" here, then these additional
	* vdevs may not be flushed; e.g. if these zio's
	* completed after "lwb_write_zio" completed.
	*/
	error = zilog->zl_get_data(itx->itx_private,
	itx->itx_gen, lrwb, dbuf, lwb,
	lwb->lwb_write_zio);
	+ if (dbuf != NULL && error == 0 && dnow == dlen)
	+ /* Zero any padding bytes in the last block. */
	+ bzero((char *)dbuf + lrwb->lr_length, dpad);

	if (error == EIO) {
	txg_wait_synced(zilog->zl_dmu_pool, txg);
	return (lwb);
	}
	if (error != 0) {
	ASSERT(error == ENOENT \|\| error == EEXIST \|\|
	error == EALREADY);
	return (lwb);
	}
	}
	}

	/*
	* We're actually making an entry, so update lrc_seq to be the
	* log record sequence number. Note that this is generally not
	* equal to the itx sequence number because not all transactions
	* are synchronous, and sometimes spa_sync() gets there first.
	*/
	lrcb->lrc_seq = ++zilog->zl_lr_seq;
	lwb->lwb_nused += reclen + dnow;

	zil_lwb_add_txg(lwb, txg);

	ASSERT3U(lwb->lwb_nused, <=, lwb->lwb_sz);
	ASSERT0(P2PHASE(lwb->lwb_nused, sizeof (uint64_t)));

	dlen -= dnow;
	if (dlen > 0) {
	zilog->zl_cur_used += reclen;
	goto cont;
	}

	return (lwb);
	}

	itx_t *
	-zil_itx_create(uint64_t txtype, size_t lrsize)
	+zil_itx_create(uint64_t txtype, size_t olrsize)
	{
	- size_t itxsize;
	+ size_t itxsize, lrsize;
	itx_t *itx;

	- lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t);
	+ lrsize = P2ROUNDUP_TYPED(olrsize, sizeof (uint64_t), size_t);
	itxsize = offsetof(itx_t, itx_lr) + lrsize;

	itx = zio_data_buf_alloc(itxsize);
	itx->itx_lr.lrc_txtype = txtype;
	itx->itx_lr.lrc_reclen = lrsize;
	itx->itx_lr.lrc_seq = 0; /* defensive */
	+ bzero((char *)&itx->itx_lr + olrsize, lrsize - olrsize);
	itx->itx_sync = B_TRUE; /* default is synchronous */
	itx->itx_callback = NULL;
	itx->itx_callback_data = NULL;
	itx->itx_size = itxsize;

	return (itx);
	}

	void
	zil_itx_destroy(itx_t *itx)
	{
	IMPLY(itx->itx_lr.lrc_txtype == TX_COMMIT, itx->itx_callback == NULL);
	IMPLY(itx->itx_callback != NULL, itx->itx_lr.lrc_txtype != TX_COMMIT);

	if (itx->itx_callback != NULL)
	itx->itx_callback(itx->itx_callback_data);

	zio_data_buf_free(itx, itx->itx_size);
	}

	/*
	* Free up the sync and async itxs. The itxs_t has already been detached
	* so no locks are needed.
	*/
	static void
	-zil_itxg_clean(itxs_t *itxs)
	+zil_itxg_clean(void *arg)
	{
	itx_t *itx;
	list_t *list;
	avl_tree_t *t;
	void *cookie;
	+ itxs_t *itxs = arg;
	itx_async_node_t *ian;

	list = &itxs->i_sync_list;
	while ((itx = list_head(list)) != NULL) {
	/*
	* In the general case, commit itxs will not be found
	* here, as they'll be committed to an lwb via
	* zil_lwb_commit(), and free'd in that function. Having
	* said that, it is still possible for commit itxs to be
	* found here, due to the following race:
	*
	* - a thread calls zil_commit() which assigns the
	* commit itx to a per-txg i_sync_list
	* - zil_itxg_clean() is called (e.g. via spa_sync())
	* while the waiter is still on the i_sync_list
	*
	* There's nothing to prevent syncing the txg while the
	* waiter is on the i_sync_list. This normally doesn't
	* happen because spa_sync() is slower than zil_commit(),
	* but if zil_commit() calls txg_wait_synced() (e.g.
	* because zil_create() or zil_commit_writer_stall() is
	* called) we will hit this case.
	*/
	if (itx->itx_lr.lrc_txtype == TX_COMMIT)
	zil_commit_waiter_skip(itx->itx_private);

	list_remove(list, itx);
	zil_itx_destroy(itx);
	}

	cookie = NULL;
	t = &itxs->i_async_tree;
	while ((ian = avl_destroy_nodes(t, &cookie)) != NULL) {
	list = &ian->ia_list;
	while ((itx = list_head(list)) != NULL) {
	list_remove(list, itx);
	/* commit itxs should never be on the async lists. */
	ASSERT3U(itx->itx_lr.lrc_txtype, !=, TX_COMMIT);
	zil_itx_destroy(itx);
	}
	list_destroy(list);
	kmem_free(ian, sizeof (itx_async_node_t));
	}
	avl_destroy(t);

	kmem_free(itxs, sizeof (itxs_t));
	}

	static int
	zil_aitx_compare(const void x1, const void x2)
	{
	const uint64_t o1 = ((itx_async_node_t *)x1)->ia_foid;
	const uint64_t o2 = ((itx_async_node_t *)x2)->ia_foid;

	return (TREE_CMP(o1, o2));
	}

	/*
	* Remove all async itx with the given oid.
	*/
	void
	zil_remove_async(zilog_t *zilog, uint64_t oid)
	{
	uint64_t otxg, txg;
	itx_async_node_t *ian;
	avl_tree_t *t;
	avl_index_t where;
	list_t clean_list;
	itx_t *itx;

	ASSERT(oid != 0);
	list_create(&clean_list, sizeof (itx_t), offsetof(itx_t, itx_node));

	if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */
	otxg = ZILTEST_TXG;
	else
	otxg = spa_last_synced_txg(zilog->zl_spa) + 1;

	for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) {
	itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK];

	mutex_enter(&itxg->itxg_lock);
	if (itxg->itxg_txg != txg) {
	mutex_exit(&itxg->itxg_lock);
	continue;
	}

	/*
	* Locate the object node and append its list.
	*/
	t = &itxg->itxg_itxs->i_async_tree;
	ian = avl_find(t, &oid, &where);
	if (ian != NULL)
	list_move_tail(&clean_list, &ian->ia_list);
	mutex_exit(&itxg->itxg_lock);
	}
	while ((itx = list_head(&clean_list)) != NULL) {
	list_remove(&clean_list, itx);
	/* commit itxs should never be on the async lists. */
	ASSERT3U(itx->itx_lr.lrc_txtype, !=, TX_COMMIT);
	zil_itx_destroy(itx);
	}
	list_destroy(&clean_list);
	}

	void
	zil_itx_assign(zilog_t zilog, itx_t itx, dmu_tx_t *tx)
	{
	uint64_t txg;
	itxg_t *itxg;
	itxs_t itxs, clean = NULL;

	/*
	* Ensure the data of a renamed file is committed before the rename.
	*/
	if ((itx->itx_lr.lrc_txtype & ~TX_CI) == TX_RENAME)
	zil_async_to_sync(zilog, itx->itx_oid);

	if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX)
	txg = ZILTEST_TXG;
	else
	txg = dmu_tx_get_txg(tx);

	itxg = &zilog->zl_itxg[txg & TXG_MASK];
	mutex_enter(&itxg->itxg_lock);
	itxs = itxg->itxg_itxs;
	if (itxg->itxg_txg != txg) {
	if (itxs != NULL) {
	/*
	* The zil_clean callback hasn't got around to cleaning
	* this itxg. Save the itxs for release below.
	* This should be rare.
	*/
	zfs_dbgmsg("zil_itx_assign: missed itx cleanup for "
	"txg %llu", (u_longlong_t)itxg->itxg_txg);
	clean = itxg->itxg_itxs;
	}
	itxg->itxg_txg = txg;
	itxs = itxg->itxg_itxs = kmem_zalloc(sizeof (itxs_t),
	KM_SLEEP);

	list_create(&itxs->i_sync_list, sizeof (itx_t),
	offsetof(itx_t, itx_node));
	avl_create(&itxs->i_async_tree, zil_aitx_compare,
	sizeof (itx_async_node_t),
	offsetof(itx_async_node_t, ia_node));
	}
	if (itx->itx_sync) {
	list_insert_tail(&itxs->i_sync_list, itx);
	} else {
	avl_tree_t *t = &itxs->i_async_tree;
	uint64_t foid =
	LR_FOID_GET_OBJ(((lr_ooo_t *)&itx->itx_lr)->lr_foid);
	itx_async_node_t *ian;
	avl_index_t where;

	ian = avl_find(t, &foid, &where);
	if (ian == NULL) {
	ian = kmem_alloc(sizeof (itx_async_node_t),
	KM_SLEEP);
	list_create(&ian->ia_list, sizeof (itx_t),
	offsetof(itx_t, itx_node));
	ian->ia_foid = foid;
	avl_insert(t, ian, where);
	}
	list_insert_tail(&ian->ia_list, itx);
	}

	itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx);

	/*
	* We don't want to dirty the ZIL using ZILTEST_TXG, because
	* zil_clean() will never be called using ZILTEST_TXG. Thus, we
	* need to be careful to always dirty the ZIL using the "real"
	* TXG (not itxg_txg) even when the SPA is frozen.
	*/
	zilog_dirty(zilog, dmu_tx_get_txg(tx));
	mutex_exit(&itxg->itxg_lock);

	/* Release the old itxs now we've dropped the lock */
	if (clean != NULL)
	zil_itxg_clean(clean);
	}

	/*
	* If there are any in-memory intent log transactions which have now been
	* synced then start up a taskq to free them. We should only do this after we
	* have written out the uberblocks (i.e. txg has been committed) so that
	* don't inadvertently clean out in-memory log records that would be required
	* by zil_commit().
	*/
	void
	zil_clean(zilog_t *zilog, uint64_t synced_txg)
	{
	itxg_t *itxg = &zilog->zl_itxg[synced_txg & TXG_MASK];
	itxs_t *clean_me;

	ASSERT3U(synced_txg, <, ZILTEST_TXG);

	mutex_enter(&itxg->itxg_lock);
	if (itxg->itxg_itxs == NULL \|\| itxg->itxg_txg == ZILTEST_TXG) {
	mutex_exit(&itxg->itxg_lock);
	return;
	}
	ASSERT3U(itxg->itxg_txg, <=, synced_txg);
	ASSERT3U(itxg->itxg_txg, !=, 0);
	clean_me = itxg->itxg_itxs;
	itxg->itxg_itxs = NULL;
	itxg->itxg_txg = 0;
	mutex_exit(&itxg->itxg_lock);
	/*
	* Preferably start a task queue to free up the old itxs but
	* if taskq_dispatch can't allocate resources to do that then
	* free it in-line. This should be rare. Note, using TQ_SLEEP
	* created a bad performance problem.
	*/
	ASSERT3P(zilog->zl_dmu_pool, !=, NULL);
	ASSERT3P(zilog->zl_dmu_pool->dp_zil_clean_taskq, !=, NULL);
	taskqid_t id = taskq_dispatch(zilog->zl_dmu_pool->dp_zil_clean_taskq,
	- (void ()(void ))zil_itxg_clean, clean_me, TQ_NOSLEEP);
	+ zil_itxg_clean, clean_me, TQ_NOSLEEP);
	if (id == TASKQID_INVALID)
	zil_itxg_clean(clean_me);
	}

	/*
	* This function will traverse the queue of itxs that need to be
	* committed, and move them onto the ZIL's zl_itx_commit_list.
	*/
	static void
	zil_get_commit_list(zilog_t *zilog)
	{
	uint64_t otxg, txg;
	list_t *commit_list = &zilog->zl_itx_commit_list;

	ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));

	if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */
	otxg = ZILTEST_TXG;
	else
	otxg = spa_last_synced_txg(zilog->zl_spa) + 1;

	/*
	* This is inherently racy, since there is nothing to prevent
	* the last synced txg from changing. That's okay since we'll
	* only commit things in the future.
	*/
	for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) {
	itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK];

	mutex_enter(&itxg->itxg_lock);
	if (itxg->itxg_txg != txg) {
	mutex_exit(&itxg->itxg_lock);
	continue;
	}

	/*
	* If we're adding itx records to the zl_itx_commit_list,
	* then the zil better be dirty in this "txg". We can assert
	* that here since we're holding the itxg_lock which will
	* prevent spa_sync from cleaning it. Once we add the itxs
	* to the zl_itx_commit_list we must commit it to disk even
	* if it's unnecessary (i.e. the txg was synced).
	*/
	ASSERT(zilog_is_dirty_in_txg(zilog, txg) \|\|
	spa_freeze_txg(zilog->zl_spa) != UINT64_MAX);
	list_move_tail(commit_list, &itxg->itxg_itxs->i_sync_list);

	mutex_exit(&itxg->itxg_lock);
	}
	}

	/*
	* Move the async itxs for a specified object to commit into sync lists.
	*/
	void
	zil_async_to_sync(zilog_t *zilog, uint64_t foid)
	{
	uint64_t otxg, txg;
	itx_async_node_t *ian;
	avl_tree_t *t;
	avl_index_t where;

	if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */
	otxg = ZILTEST_TXG;
	else
	otxg = spa_last_synced_txg(zilog->zl_spa) + 1;

	/*
	* This is inherently racy, since there is nothing to prevent
	* the last synced txg from changing.
	*/
	for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) {
	itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK];

	mutex_enter(&itxg->itxg_lock);
	if (itxg->itxg_txg != txg) {
	mutex_exit(&itxg->itxg_lock);
	continue;
	}

	/*
	* If a foid is specified then find that node and append its
	* list. Otherwise walk the tree appending all the lists
	* to the sync list. We add to the end rather than the
	* beginning to ensure the create has happened.
	*/
	t = &itxg->itxg_itxs->i_async_tree;
	if (foid != 0) {
	ian = avl_find(t, &foid, &where);
	if (ian != NULL) {
	list_move_tail(&itxg->itxg_itxs->i_sync_list,
	&ian->ia_list);
	}
	} else {
	void *cookie = NULL;

	while ((ian = avl_destroy_nodes(t, &cookie)) != NULL) {
	list_move_tail(&itxg->itxg_itxs->i_sync_list,
	&ian->ia_list);
	list_destroy(&ian->ia_list);
	kmem_free(ian, sizeof (itx_async_node_t));
	}
	}
	mutex_exit(&itxg->itxg_lock);
	}
	}

	/*
	* This function will prune commit itxs that are at the head of the
	* commit list (it won't prune past the first non-commit itx), and
	* either: a) attach them to the last lwb that's still pending
	* completion, or b) skip them altogether.
	*
	* This is used as a performance optimization to prevent commit itxs
	* from generating new lwbs when it's unnecessary to do so.
	*/
	static void
	zil_prune_commit_list(zilog_t *zilog)
	{
	itx_t *itx;

	ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));

	while ((itx = list_head(&zilog->zl_itx_commit_list)) != NULL) {
	lr_t *lrc = &itx->itx_lr;
	if (lrc->lrc_txtype != TX_COMMIT)
	break;

	mutex_enter(&zilog->zl_lock);

	lwb_t *last_lwb = zilog->zl_last_lwb_opened;
	if (last_lwb == NULL \|\|
	last_lwb->lwb_state == LWB_STATE_FLUSH_DONE) {
	/*
	* All of the itxs this waiter was waiting on
	* must have already completed (or there were
	* never any itx's for it to wait on), so it's
	* safe to skip this waiter and mark it done.
	*/
	zil_commit_waiter_skip(itx->itx_private);
	} else {
	zil_commit_waiter_link_lwb(itx->itx_private, last_lwb);
	itx->itx_private = NULL;
	}

	mutex_exit(&zilog->zl_lock);

	list_remove(&zilog->zl_itx_commit_list, itx);
	zil_itx_destroy(itx);
	}

	IMPLY(itx != NULL, itx->itx_lr.lrc_txtype != TX_COMMIT);
	}

	static void
	zil_commit_writer_stall(zilog_t *zilog)
	{
	/*
	* When zio_alloc_zil() fails to allocate the next lwb block on
	* disk, we must call txg_wait_synced() to ensure all of the
	* lwbs in the zilog's zl_lwb_list are synced and then freed (in
	* zil_sync()), such that any subsequent ZIL writer (i.e. a call
	* to zil_process_commit_list()) will have to call zil_create(),
	* and start a new ZIL chain.
	*
	* Since zil_alloc_zil() failed, the lwb that was previously
	* issued does not have a pointer to the "next" lwb on disk.
	* Thus, if another ZIL writer thread was to allocate the "next"
	* on-disk lwb, that block could be leaked in the event of a
	* crash (because the previous lwb on-disk would not point to
	* it).
	*
	* We must hold the zilog's zl_issuer_lock while we do this, to
	* ensure no new threads enter zil_process_commit_list() until
	* all lwb's in the zl_lwb_list have been synced and freed
	* (which is achieved via the txg_wait_synced() call).
	*/
	ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));
	txg_wait_synced(zilog->zl_dmu_pool, 0);
	ASSERT3P(list_tail(&zilog->zl_lwb_list), ==, NULL);
	}

	/*
	* This function will traverse the commit list, creating new lwbs as
	* needed, and committing the itxs from the commit list to these newly
	* created lwbs. Additionally, as a new lwb is created, the previous
	* lwb will be issued to the zio layer to be written to disk.
	*/
	static void
	zil_process_commit_list(zilog_t *zilog)
	{
	spa_t *spa = zilog->zl_spa;
	list_t nolwb_itxs;
	list_t nolwb_waiters;
	lwb_t *lwb;
	itx_t *itx;

	ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));

	/*
	* Return if there's nothing to commit before we dirty the fs by
	* calling zil_create().
	*/
	if (list_head(&zilog->zl_itx_commit_list) == NULL)
	return;

	list_create(&nolwb_itxs, sizeof (itx_t), offsetof(itx_t, itx_node));
	list_create(&nolwb_waiters, sizeof (zil_commit_waiter_t),
	offsetof(zil_commit_waiter_t, zcw_node));

	lwb = list_tail(&zilog->zl_lwb_list);
	if (lwb == NULL) {
	lwb = zil_create(zilog);
	} else {
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_ISSUED);
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_WRITE_DONE);
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_FLUSH_DONE);
	}

	while ((itx = list_head(&zilog->zl_itx_commit_list)) != NULL) {
	lr_t *lrc = &itx->itx_lr;
	uint64_t txg = lrc->lrc_txg;

	ASSERT3U(txg, !=, 0);

	if (lrc->lrc_txtype == TX_COMMIT) {
	DTRACE_PROBE2(zil__process__commit__itx,
	zilog_t , zilog, itx_t , itx);
	} else {
	DTRACE_PROBE2(zil__process__normal__itx,
	zilog_t , zilog, itx_t , itx);
	}

	list_remove(&zilog->zl_itx_commit_list, itx);

	boolean_t synced = txg <= spa_last_synced_txg(spa);
	boolean_t frozen = txg > spa_freeze_txg(spa);

	/*
	* If the txg of this itx has already been synced out, then
	* we don't need to commit this itx to an lwb. This is
	* because the data of this itx will have already been
	* written to the main pool. This is inherently racy, and
	* it's still ok to commit an itx whose txg has already
	* been synced; this will result in a write that's
	* unnecessary, but will do no harm.
	*
	* With that said, we always want to commit TX_COMMIT itxs
	* to an lwb, regardless of whether or not that itx's txg
	* has been synced out. We do this to ensure any OPENED lwb
	* will always have at least one zil_commit_waiter_t linked
	* to the lwb.
	*
	* As a counter-example, if we skipped TX_COMMIT itx's
	* whose txg had already been synced, the following
	* situation could occur if we happened to be racing with
	* spa_sync:
	*
	* 1. We commit a non-TX_COMMIT itx to an lwb, where the
	* itx's txg is 10 and the last synced txg is 9.
	* 2. spa_sync finishes syncing out txg 10.
	* 3. We move to the next itx in the list, it's a TX_COMMIT
	* whose txg is 10, so we skip it rather than committing
	* it to the lwb used in (1).
	*
	* If the itx that is skipped in (3) is the last TX_COMMIT
	* itx in the commit list, than it's possible for the lwb
	* used in (1) to remain in the OPENED state indefinitely.
	*
	* To prevent the above scenario from occurring, ensuring
	* that once an lwb is OPENED it will transition to ISSUED
	* and eventually DONE, we always commit TX_COMMIT itx's to
	* an lwb here, even if that itx's txg has already been
	* synced.
	*
	* Finally, if the pool is frozen, we _always_ commit the
	* itx. The point of freezing the pool is to prevent data
	* from being written to the main pool via spa_sync, and
	* instead rely solely on the ZIL to persistently store the
	* data; i.e. when the pool is frozen, the last synced txg
	* value can't be trusted.
	*/
	if (frozen \|\| !synced \|\| lrc->lrc_txtype == TX_COMMIT) {
	if (lwb != NULL) {
	lwb = zil_lwb_commit(zilog, itx, lwb);

	if (lwb == NULL)
	list_insert_tail(&nolwb_itxs, itx);
	else
	list_insert_tail(&lwb->lwb_itxs, itx);
	} else {
	if (lrc->lrc_txtype == TX_COMMIT) {
	zil_commit_waiter_link_nolwb(
	itx->itx_private, &nolwb_waiters);
	}

	list_insert_tail(&nolwb_itxs, itx);
	}
	} else {
	ASSERT3S(lrc->lrc_txtype, !=, TX_COMMIT);
	zil_itx_destroy(itx);
	}
	}

	if (lwb == NULL) {
	/*
	* This indicates zio_alloc_zil() failed to allocate the
	* "next" lwb on-disk. When this happens, we must stall
	* the ZIL write pipeline; see the comment within
	* zil_commit_writer_stall() for more details.
	*/
	zil_commit_writer_stall(zilog);

	/*
	* Additionally, we have to signal and mark the "nolwb"
	* waiters as "done" here, since without an lwb, we
	* can't do this via zil_lwb_flush_vdevs_done() like
	* normal.
	*/
	zil_commit_waiter_t *zcw;
	while ((zcw = list_head(&nolwb_waiters)) != NULL) {
	zil_commit_waiter_skip(zcw);
	list_remove(&nolwb_waiters, zcw);
	}

	/*
	* And finally, we have to destroy the itx's that
	* couldn't be committed to an lwb; this will also call
	* the itx's callback if one exists for the itx.
	*/
	while ((itx = list_head(&nolwb_itxs)) != NULL) {
	list_remove(&nolwb_itxs, itx);
	zil_itx_destroy(itx);
	}
	} else {
	ASSERT(list_is_empty(&nolwb_waiters));
	ASSERT3P(lwb, !=, NULL);
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_ISSUED);
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_WRITE_DONE);
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_FLUSH_DONE);

	/*
	* At this point, the ZIL block pointed at by the "lwb"
	* variable is in one of the following states: "closed"
	* or "open".
	*
	* If it's "closed", then no itxs have been committed to
	* it, so there's no point in issuing its zio (i.e. it's
	* "empty").
	*
	* If it's "open", then it contains one or more itxs that
	* eventually need to be committed to stable storage. In
	* this case we intentionally do not issue the lwb's zio
	* to disk yet, and instead rely on one of the following
	* two mechanisms for issuing the zio:
	*
	* 1. Ideally, there will be more ZIL activity occurring
	* on the system, such that this function will be
	* immediately called again (not necessarily by the same
	* thread) and this lwb's zio will be issued via
	* zil_lwb_commit(). This way, the lwb is guaranteed to
	* be "full" when it is issued to disk, and we'll make
	* use of the lwb's size the best we can.
	*
	* 2. If there isn't sufficient ZIL activity occurring on
	* the system, such that this lwb's zio isn't issued via
	* zil_lwb_commit(), zil_commit_waiter() will issue the
	* lwb's zio. If this occurs, the lwb is not guaranteed
	* to be "full" by the time its zio is issued, and means
	* the size of the lwb was "too large" given the amount
	* of ZIL activity occurring on the system at that time.
	*
	* We do this for a couple of reasons:
	*
	* 1. To try and reduce the number of IOPs needed to
	* write the same number of itxs. If an lwb has space
	* available in its buffer for more itxs, and more itxs
	* will be committed relatively soon (relative to the
	* latency of performing a write), then it's beneficial
	* to wait for these "next" itxs. This way, more itxs
	* can be committed to stable storage with fewer writes.
	*
	* 2. To try and use the largest lwb block size that the
	* incoming rate of itxs can support. Again, this is to
	* try and pack as many itxs into as few lwbs as
	* possible, without significantly impacting the latency
	* of each individual itx.
	*/
	}
	}

	/*
	* This function is responsible for ensuring the passed in commit waiter
	* (and associated commit itx) is committed to an lwb. If the waiter is
	* not already committed to an lwb, all itxs in the zilog's queue of
	* itxs will be processed. The assumption is the passed in waiter's
	* commit itx will found in the queue just like the other non-commit
	* itxs, such that when the entire queue is processed, the waiter will
	* have been committed to an lwb.
	*
	* The lwb associated with the passed in waiter is not guaranteed to
	* have been issued by the time this function completes. If the lwb is
	* not issued, we rely on future calls to zil_commit_writer() to issue
	* the lwb, or the timeout mechanism found in zil_commit_waiter().
	*/
	static void
	zil_commit_writer(zilog_t zilog, zil_commit_waiter_t zcw)
	{
	ASSERT(!MUTEX_HELD(&zilog->zl_lock));
	ASSERT(spa_writeable(zilog->zl_spa));

	mutex_enter(&zilog->zl_issuer_lock);

	if (zcw->zcw_lwb != NULL \|\| zcw->zcw_done) {
	/*
	* It's possible that, while we were waiting to acquire
	* the "zl_issuer_lock", another thread committed this
	* waiter to an lwb. If that occurs, we bail out early,
	* without processing any of the zilog's queue of itxs.
	*
	* On certain workloads and system configurations, the
	* "zl_issuer_lock" can become highly contended. In an
	* attempt to reduce this contention, we immediately drop
	* the lock if the waiter has already been processed.
	*
	* We've measured this optimization to reduce CPU spent
	* contending on this lock by up to 5%, using a system
	* with 32 CPUs, low latency storage (~50 usec writes),
	* and 1024 threads performing sync writes.
	*/
	goto out;
	}

	ZIL_STAT_BUMP(zil_commit_writer_count);

	zil_get_commit_list(zilog);
	zil_prune_commit_list(zilog);
	zil_process_commit_list(zilog);

	out:
	mutex_exit(&zilog->zl_issuer_lock);
	}

	static void
	zil_commit_waiter_timeout(zilog_t zilog, zil_commit_waiter_t zcw)
	{
	ASSERT(!MUTEX_HELD(&zilog->zl_issuer_lock));
	ASSERT(MUTEX_HELD(&zcw->zcw_lock));
	ASSERT3B(zcw->zcw_done, ==, B_FALSE);

	lwb_t *lwb = zcw->zcw_lwb;
	ASSERT3P(lwb, !=, NULL);
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_CLOSED);

	/*
	* If the lwb has already been issued by another thread, we can
	* immediately return since there's no work to be done (the
	* point of this function is to issue the lwb). Additionally, we
	* do this prior to acquiring the zl_issuer_lock, to avoid
	* acquiring it when it's not necessary to do so.
	*/
	if (lwb->lwb_state == LWB_STATE_ISSUED \|\|
	lwb->lwb_state == LWB_STATE_WRITE_DONE \|\|
	lwb->lwb_state == LWB_STATE_FLUSH_DONE)
	return;

	/*
	* In order to call zil_lwb_write_issue() we must hold the
	* zilog's "zl_issuer_lock". We can't simply acquire that lock,
	* since we're already holding the commit waiter's "zcw_lock",
	* and those two locks are acquired in the opposite order
	* elsewhere.
	*/
	mutex_exit(&zcw->zcw_lock);
	mutex_enter(&zilog->zl_issuer_lock);
	mutex_enter(&zcw->zcw_lock);

	/*
	* Since we just dropped and re-acquired the commit waiter's
	* lock, we have to re-check to see if the waiter was marked
	* "done" during that process. If the waiter was marked "done",
	* the "lwb" pointer is no longer valid (it can be free'd after
	* the waiter is marked "done"), so without this check we could
	* wind up with a use-after-free error below.
	*/
	if (zcw->zcw_done)
	goto out;

	ASSERT3P(lwb, ==, zcw->zcw_lwb);

	/*
	* We've already checked this above, but since we hadn't acquired
	* the zilog's zl_issuer_lock, we have to perform this check a
	* second time while holding the lock.
	*
	* We don't need to hold the zl_lock since the lwb cannot transition
	* from OPENED to ISSUED while we hold the zl_issuer_lock. The lwb
	* _can_ transition from ISSUED to DONE, but it's OK to race with
	* that transition since we treat the lwb the same, whether it's in
	* the ISSUED or DONE states.
	*
	* The important thing, is we treat the lwb differently depending on
	* if it's ISSUED or OPENED, and block any other threads that might
	* attempt to issue this lwb. For that reason we hold the
	* zl_issuer_lock when checking the lwb_state; we must not call
	* zil_lwb_write_issue() if the lwb had already been issued.
	*
	* See the comment above the lwb_state_t structure definition for
	* more details on the lwb states, and locking requirements.
	*/
	if (lwb->lwb_state == LWB_STATE_ISSUED \|\|
	lwb->lwb_state == LWB_STATE_WRITE_DONE \|\|
	lwb->lwb_state == LWB_STATE_FLUSH_DONE)
	goto out;

	ASSERT3S(lwb->lwb_state, ==, LWB_STATE_OPENED);

	/*
	* As described in the comments above zil_commit_waiter() and
	* zil_process_commit_list(), we need to issue this lwb's zio
	* since we've reached the commit waiter's timeout and it still
	* hasn't been issued.
	*/
	lwb_t *nlwb = zil_lwb_write_issue(zilog, lwb);

	IMPLY(nlwb != NULL, lwb->lwb_state != LWB_STATE_OPENED);

	/*
	* Since the lwb's zio hadn't been issued by the time this thread
	* reached its timeout, we reset the zilog's "zl_cur_used" field
	* to influence the zil block size selection algorithm.
	*
	* By having to issue the lwb's zio here, it means the size of the
	* lwb was too large, given the incoming throughput of itxs. By
	* setting "zl_cur_used" to zero, we communicate this fact to the
	* block size selection algorithm, so it can take this information
	* into account, and potentially select a smaller size for the
	* next lwb block that is allocated.
	*/
	zilog->zl_cur_used = 0;

	if (nlwb == NULL) {
	/*
	* When zil_lwb_write_issue() returns NULL, this
	* indicates zio_alloc_zil() failed to allocate the
	* "next" lwb on-disk. When this occurs, the ZIL write
	* pipeline must be stalled; see the comment within the
	* zil_commit_writer_stall() function for more details.
	*
	* We must drop the commit waiter's lock prior to
	* calling zil_commit_writer_stall() or else we can wind
	* up with the following deadlock:
	*
	* - This thread is waiting for the txg to sync while
	* holding the waiter's lock; txg_wait_synced() is
	* used within txg_commit_writer_stall().
	*
	* - The txg can't sync because it is waiting for this
	* lwb's zio callback to call dmu_tx_commit().
	*
	* - The lwb's zio callback can't call dmu_tx_commit()
	* because it's blocked trying to acquire the waiter's
	* lock, which occurs prior to calling dmu_tx_commit()
	*/
	mutex_exit(&zcw->zcw_lock);
	zil_commit_writer_stall(zilog);
	mutex_enter(&zcw->zcw_lock);
	}

	out:
	mutex_exit(&zilog->zl_issuer_lock);
	ASSERT(MUTEX_HELD(&zcw->zcw_lock));
	}

	/*
	* This function is responsible for performing the following two tasks:
	*
	* 1. its primary responsibility is to block until the given "commit
	* waiter" is considered "done".
	*
	* 2. its secondary responsibility is to issue the zio for the lwb that
	* the given "commit waiter" is waiting on, if this function has
	* waited "long enough" and the lwb is still in the "open" state.
	*
	* Given a sufficient amount of itxs being generated and written using
	* the ZIL, the lwb's zio will be issued via the zil_lwb_commit()
	* function. If this does not occur, this secondary responsibility will
	* ensure the lwb is issued even if there is not other synchronous
	* activity on the system.
	*
	* For more details, see zil_process_commit_list(); more specifically,
	* the comment at the bottom of that function.
	*/
	static void
	zil_commit_waiter(zilog_t zilog, zil_commit_waiter_t zcw)
	{
	ASSERT(!MUTEX_HELD(&zilog->zl_lock));
	ASSERT(!MUTEX_HELD(&zilog->zl_issuer_lock));
	ASSERT(spa_writeable(zilog->zl_spa));

	mutex_enter(&zcw->zcw_lock);

	/*
	* The timeout is scaled based on the lwb latency to avoid
	* significantly impacting the latency of each individual itx.
	* For more details, see the comment at the bottom of the
	* zil_process_commit_list() function.
	*/
	int pct = MAX(zfs_commit_timeout_pct, 1);
	hrtime_t sleep = (zilog->zl_last_lwb_latency * pct) / 100;
	hrtime_t wakeup = gethrtime() + sleep;
	boolean_t timedout = B_FALSE;

	while (!zcw->zcw_done) {
	ASSERT(MUTEX_HELD(&zcw->zcw_lock));

	lwb_t *lwb = zcw->zcw_lwb;

	/*
	* Usually, the waiter will have a non-NULL lwb field here,
	* but it's possible for it to be NULL as a result of
	* zil_commit() racing with spa_sync().
	*
	* When zil_clean() is called, it's possible for the itxg
	* list (which may be cleaned via a taskq) to contain
	* commit itxs. When this occurs, the commit waiters linked
	* off of these commit itxs will not be committed to an
	* lwb. Additionally, these commit waiters will not be
	* marked done until zil_commit_waiter_skip() is called via
	* zil_itxg_clean().
	*
	* Thus, it's possible for this commit waiter (i.e. the
	* "zcw" variable) to be found in this "in between" state;
	* where it's "zcw_lwb" field is NULL, and it hasn't yet
	* been skipped, so it's "zcw_done" field is still B_FALSE.
	*/
	IMPLY(lwb != NULL, lwb->lwb_state != LWB_STATE_CLOSED);

	if (lwb != NULL && lwb->lwb_state == LWB_STATE_OPENED) {
	ASSERT3B(timedout, ==, B_FALSE);

	/*
	* If the lwb hasn't been issued yet, then we
	* need to wait with a timeout, in case this
	* function needs to issue the lwb after the
	* timeout is reached; responsibility (2) from
	* the comment above this function.
	*/
	int rc = cv_timedwait_hires(&zcw->zcw_cv,
	&zcw->zcw_lock, wakeup, USEC2NSEC(1),
	CALLOUT_FLAG_ABSOLUTE);

	if (rc != -1 \|\| zcw->zcw_done)
	continue;

	timedout = B_TRUE;
	zil_commit_waiter_timeout(zilog, zcw);

	if (!zcw->zcw_done) {
	/*
	* If the commit waiter has already been
	* marked "done", it's possible for the
	* waiter's lwb structure to have already
	* been freed. Thus, we can only reliably
	* make these assertions if the waiter
	* isn't done.
	*/
	ASSERT3P(lwb, ==, zcw->zcw_lwb);
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_OPENED);
	}
	} else {
	/*
	* If the lwb isn't open, then it must have already
	* been issued. In that case, there's no need to
	* use a timeout when waiting for the lwb to
	* complete.
	*
	* Additionally, if the lwb is NULL, the waiter
	* will soon be signaled and marked done via
	* zil_clean() and zil_itxg_clean(), so no timeout
	* is required.
	*/

	IMPLY(lwb != NULL,
	lwb->lwb_state == LWB_STATE_ISSUED \|\|
	lwb->lwb_state == LWB_STATE_WRITE_DONE \|\|
	lwb->lwb_state == LWB_STATE_FLUSH_DONE);
	cv_wait(&zcw->zcw_cv, &zcw->zcw_lock);
	}
	}

	mutex_exit(&zcw->zcw_lock);
	}

	static zil_commit_waiter_t *
	zil_alloc_commit_waiter(void)
	{
	zil_commit_waiter_t *zcw = kmem_cache_alloc(zil_zcw_cache, KM_SLEEP);

	cv_init(&zcw->zcw_cv, NULL, CV_DEFAULT, NULL);
	mutex_init(&zcw->zcw_lock, NULL, MUTEX_DEFAULT, NULL);
	list_link_init(&zcw->zcw_node);
	zcw->zcw_lwb = NULL;
	zcw->zcw_done = B_FALSE;
	zcw->zcw_zio_error = 0;

	return (zcw);
	}

	static void
	zil_free_commit_waiter(zil_commit_waiter_t *zcw)
	{
	ASSERT(!list_link_active(&zcw->zcw_node));
	ASSERT3P(zcw->zcw_lwb, ==, NULL);
	ASSERT3B(zcw->zcw_done, ==, B_TRUE);
	mutex_destroy(&zcw->zcw_lock);
	cv_destroy(&zcw->zcw_cv);
	kmem_cache_free(zil_zcw_cache, zcw);
	}

	/*
	* This function is used to create a TX_COMMIT itx and assign it. This
	* way, it will be linked into the ZIL's list of synchronous itxs, and
	* then later committed to an lwb (or skipped) when
	* zil_process_commit_list() is called.
	*/
	static void
	zil_commit_itx_assign(zilog_t zilog, zil_commit_waiter_t zcw)
	{
	dmu_tx_t *tx = dmu_tx_create(zilog->zl_os);
	VERIFY0(dmu_tx_assign(tx, TXG_WAIT));

	itx_t *itx = zil_itx_create(TX_COMMIT, sizeof (lr_t));
	itx->itx_sync = B_TRUE;
	itx->itx_private = zcw;

	zil_itx_assign(zilog, itx, tx);

	dmu_tx_commit(tx);
	}

	/*
	* Commit ZFS Intent Log transactions (itxs) to stable storage.
	*
	* When writing ZIL transactions to the on-disk representation of the
	* ZIL, the itxs are committed to a Log Write Block (lwb). Multiple
	* itxs can be committed to a single lwb. Once a lwb is written and
	* committed to stable storage (i.e. the lwb is written, and vdevs have
	* been flushed), each itx that was committed to that lwb is also
	* considered to be committed to stable storage.
	*
	* When an itx is committed to an lwb, the log record (lr_t) contained
	* by the itx is copied into the lwb's zio buffer, and once this buffer
	* is written to disk, it becomes an on-disk ZIL block.
	*
	* As itxs are generated, they're inserted into the ZIL's queue of
	* uncommitted itxs. The semantics of zil_commit() are such that it will
	* block until all itxs that were in the queue when it was called, are
	* committed to stable storage.
	*
	* If "foid" is zero, this means all "synchronous" and "asynchronous"
	* itxs, for all objects in the dataset, will be committed to stable
	* storage prior to zil_commit() returning. If "foid" is non-zero, all
	* "synchronous" itxs for all objects, but only "asynchronous" itxs
	* that correspond to the foid passed in, will be committed to stable
	* storage prior to zil_commit() returning.
	*
	* Generally speaking, when zil_commit() is called, the consumer doesn't
	* actually care about _all_ of the uncommitted itxs. Instead, they're
	* simply trying to waiting for a specific itx to be committed to disk,
	* but the interface(s) for interacting with the ZIL don't allow such
	* fine-grained communication. A better interface would allow a consumer
	* to create and assign an itx, and then pass a reference to this itx to
	* zil_commit(); such that zil_commit() would return as soon as that
	* specific itx was committed to disk (instead of waiting for _all_
	* itxs to be committed).
	*
	* When a thread calls zil_commit() a special "commit itx" will be
	* generated, along with a corresponding "waiter" for this commit itx.
	* zil_commit() will wait on this waiter's CV, such that when the waiter
	* is marked done, and signaled, zil_commit() will return.
	*
	* This commit itx is inserted into the queue of uncommitted itxs. This
	* provides an easy mechanism for determining which itxs were in the
	* queue prior to zil_commit() having been called, and which itxs were
	* added after zil_commit() was called.
	*
	* The commit it is special; it doesn't have any on-disk representation.
	* When a commit itx is "committed" to an lwb, the waiter associated
	* with it is linked onto the lwb's list of waiters. Then, when that lwb
	* completes, each waiter on the lwb's list is marked done and signaled
	* -- allowing the thread waiting on the waiter to return from zil_commit().
	*
	* It's important to point out a few critical factors that allow us
	* to make use of the commit itxs, commit waiters, per-lwb lists of
	* commit waiters, and zio completion callbacks like we're doing:
	*
	* 1. The list of waiters for each lwb is traversed, and each commit
	* waiter is marked "done" and signaled, in the zio completion
	* callback of the lwb's zio[*].
	*
	* * Actually, the waiters are signaled in the zio completion
	* callback of the root zio for the DKIOCFLUSHWRITECACHE commands
	* that are sent to the vdevs upon completion of the lwb zio.
	*
	* 2. When the itxs are inserted into the ZIL's queue of uncommitted
	* itxs, the order in which they are inserted is preserved[*]; as
	* itxs are added to the queue, they are added to the tail of
	* in-memory linked lists.
	*
	* When committing the itxs to lwbs (to be written to disk), they
	* are committed in the same order in which the itxs were added to
	* the uncommitted queue's linked list(s); i.e. the linked list of
	* itxs to commit is traversed from head to tail, and each itx is
	* committed to an lwb in that order.
	*
	* * To clarify:
	*
	* - the order of "sync" itxs is preserved w.r.t. other
	* "sync" itxs, regardless of the corresponding objects.
	* - the order of "async" itxs is preserved w.r.t. other
	* "async" itxs corresponding to the same object.
	* - the order of "async" itxs is not preserved w.r.t. other
	* "async" itxs corresponding to different objects.
	* - the order of "sync" itxs w.r.t. "async" itxs (or vice
	* versa) is not preserved, even for itxs that correspond
	* to the same object.
	*
	* For more details, see: zil_itx_assign(), zil_async_to_sync(),
	* zil_get_commit_list(), and zil_process_commit_list().
	*
	* 3. The lwbs represent a linked list of blocks on disk. Thus, any
	* lwb cannot be considered committed to stable storage, until its
	* "previous" lwb is also committed to stable storage. This fact,
	* coupled with the fact described above, means that itxs are
	* committed in (roughly) the order in which they were generated.
	* This is essential because itxs are dependent on prior itxs.
	* Thus, we must not deem an itx as being committed to stable
	* storage, until all prior itxs have also been committed to
	* stable storage.
	*
	* To enforce this ordering of lwb zio's, while still leveraging as
	* much of the underlying storage performance as possible, we rely
	* on two fundamental concepts:
	*
	* 1. The creation and issuance of lwb zio's is protected by
	* the zilog's "zl_issuer_lock", which ensures only a single
	* thread is creating and/or issuing lwb's at a time
	* 2. The "previous" lwb is a child of the "current" lwb
	* (leveraging the zio parent-child dependency graph)
	*
	* By relying on this parent-child zio relationship, we can have
	* many lwb zio's concurrently issued to the underlying storage,
	* but the order in which they complete will be the same order in
	* which they were created.
	*/
	void
	zil_commit(zilog_t *zilog, uint64_t foid)
	{
	/*
	* We should never attempt to call zil_commit on a snapshot for
	* a couple of reasons:
	*
	* 1. A snapshot may never be modified, thus it cannot have any
	* in-flight itxs that would have modified the dataset.
	*
	* 2. By design, when zil_commit() is called, a commit itx will
	* be assigned to this zilog; as a result, the zilog will be
	* dirtied. We must not dirty the zilog of a snapshot; there's
	* checks in the code that enforce this invariant, and will
	* cause a panic if it's not upheld.
	*/
	ASSERT3B(dmu_objset_is_snapshot(zilog->zl_os), ==, B_FALSE);

	if (zilog->zl_sync == ZFS_SYNC_DISABLED)
	return;

	if (!spa_writeable(zilog->zl_spa)) {
	/*
	* If the SPA is not writable, there should never be any
	* pending itxs waiting to be committed to disk. If that
	* weren't true, we'd skip writing those itxs out, and
	* would break the semantics of zil_commit(); thus, we're
	* verifying that truth before we return to the caller.
	*/
	ASSERT(list_is_empty(&zilog->zl_lwb_list));
	ASSERT3P(zilog->zl_last_lwb_opened, ==, NULL);
	for (int i = 0; i < TXG_SIZE; i++)
	ASSERT3P(zilog->zl_itxg[i].itxg_itxs, ==, NULL);
	return;
	}

	/*
	* If the ZIL is suspended, we don't want to dirty it by calling
	* zil_commit_itx_assign() below, nor can we write out
	* lwbs like would be done in zil_commit_write(). Thus, we
	* simply rely on txg_wait_synced() to maintain the necessary
	* semantics, and avoid calling those functions altogether.
	*/
	if (zilog->zl_suspend > 0) {
	txg_wait_synced(zilog->zl_dmu_pool, 0);
	return;
	}

	zil_commit_impl(zilog, foid);
	}

	void
	zil_commit_impl(zilog_t *zilog, uint64_t foid)
	{
	ZIL_STAT_BUMP(zil_commit_count);

	/*
	* Move the "async" itxs for the specified foid to the "sync"
	* queues, such that they will be later committed (or skipped)
	* to an lwb when zil_process_commit_list() is called.
	*
	* Since these "async" itxs must be committed prior to this
	* call to zil_commit returning, we must perform this operation
	* before we call zil_commit_itx_assign().
	*/
	zil_async_to_sync(zilog, foid);

	/*
	* We allocate a new "waiter" structure which will initially be
	* linked to the commit itx using the itx's "itx_private" field.
	* Since the commit itx doesn't represent any on-disk state,
	* when it's committed to an lwb, rather than copying the its
	* lr_t into the lwb's buffer, the commit itx's "waiter" will be
	* added to the lwb's list of waiters. Then, when the lwb is
	* committed to stable storage, each waiter in the lwb's list of
	* waiters will be marked "done", and signalled.
	*
	* We must create the waiter and assign the commit itx prior to
	* calling zil_commit_writer(), or else our specific commit itx
	* is not guaranteed to be committed to an lwb prior to calling
	* zil_commit_waiter().
	*/
	zil_commit_waiter_t *zcw = zil_alloc_commit_waiter();
	zil_commit_itx_assign(zilog, zcw);

	zil_commit_writer(zilog, zcw);
	zil_commit_waiter(zilog, zcw);

	if (zcw->zcw_zio_error != 0) {
	/*
	* If there was an error writing out the ZIL blocks that
	* this thread is waiting on, then we fallback to
	* relying on spa_sync() to write out the data this
	* thread is waiting on. Obviously this has performance
	* implications, but the expectation is for this to be
	* an exceptional case, and shouldn't occur often.
	*/
	DTRACE_PROBE2(zil__commit__io__error,
	zilog_t , zilog, zil_commit_waiter_t , zcw);
	txg_wait_synced(zilog->zl_dmu_pool, 0);
	}

	zil_free_commit_waiter(zcw);
	}

	/*
	* Called in syncing context to free committed log blocks and update log header.
	*/
	void
	zil_sync(zilog_t zilog, dmu_tx_t tx)
	{
	zil_header_t *zh = zil_header_in_syncing_context(zilog);
	uint64_t txg = dmu_tx_get_txg(tx);
	spa_t *spa = zilog->zl_spa;
	uint64_t *replayed_seq = &zilog->zl_replayed_seq[txg & TXG_MASK];
	lwb_t *lwb;

	/*
	* We don't zero out zl_destroy_txg, so make sure we don't try
	* to destroy it twice.
	*/
	if (spa_sync_pass(spa) != 1)
	return;

	mutex_enter(&zilog->zl_lock);

	ASSERT(zilog->zl_stop_sync == 0);

	if (*replayed_seq != 0) {
	ASSERT(zh->zh_replay_seq < *replayed_seq);
	zh->zh_replay_seq = *replayed_seq;
	*replayed_seq = 0;
	}

	if (zilog->zl_destroy_txg == txg) {
	blkptr_t blk = zh->zh_log;

	ASSERT(list_head(&zilog->zl_lwb_list) == NULL);

	bzero(zh, sizeof (zil_header_t));
	bzero(zilog->zl_replayed_seq, sizeof (zilog->zl_replayed_seq));

	if (zilog->zl_keep_first) {
	/*
	* If this block was part of log chain that couldn't
	* be claimed because a device was missing during
	* zil_claim(), but that device later returns,
	* then this block could erroneously appear valid.
	* To guard against this, assign a new GUID to the new
	* log chain so it doesn't matter what blk points to.
	*/
	zil_init_log_chain(zilog, &blk);
	zh->zh_log = blk;
	}
	}

	while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
	zh->zh_log = lwb->lwb_blk;
	if (lwb->lwb_buf != NULL \|\| lwb->lwb_max_txg > txg)
	break;
	list_remove(&zilog->zl_lwb_list, lwb);
	zio_free(spa, txg, &lwb->lwb_blk);
	zil_free_lwb(zilog, lwb);

	/*
	* If we don't have anything left in the lwb list then
	* we've had an allocation failure and we need to zero
	* out the zil_header blkptr so that we don't end
	* up freeing the same block twice.
	*/
	if (list_head(&zilog->zl_lwb_list) == NULL)
	BP_ZERO(&zh->zh_log);
	}

	/*
	* Remove fastwrite on any blocks that have been pre-allocated for
	* the next commit. This prevents fastwrite counter pollution by
	* unused, long-lived LWBs.
	*/
	for (; lwb != NULL; lwb = list_next(&zilog->zl_lwb_list, lwb)) {
	if (lwb->lwb_fastwrite && !lwb->lwb_write_zio) {
	metaslab_fastwrite_unmark(zilog->zl_spa, &lwb->lwb_blk);
	lwb->lwb_fastwrite = 0;
	}
	}

	mutex_exit(&zilog->zl_lock);
	}

	/* ARGSUSED */
	static int
	zil_lwb_cons(void vbuf, void unused, int kmflag)
	{
	lwb_t *lwb = vbuf;
	list_create(&lwb->lwb_itxs, sizeof (itx_t), offsetof(itx_t, itx_node));
	list_create(&lwb->lwb_waiters, sizeof (zil_commit_waiter_t),
	offsetof(zil_commit_waiter_t, zcw_node));
	avl_create(&lwb->lwb_vdev_tree, zil_lwb_vdev_compare,
	sizeof (zil_vdev_node_t), offsetof(zil_vdev_node_t, zv_node));
	mutex_init(&lwb->lwb_vdev_lock, NULL, MUTEX_DEFAULT, NULL);
	return (0);
	}

	/* ARGSUSED */
	static void
	zil_lwb_dest(void vbuf, void unused)
	{
	lwb_t *lwb = vbuf;
	mutex_destroy(&lwb->lwb_vdev_lock);
	avl_destroy(&lwb->lwb_vdev_tree);
	list_destroy(&lwb->lwb_waiters);
	list_destroy(&lwb->lwb_itxs);
	}

	void
	zil_init(void)
	{
	zil_lwb_cache = kmem_cache_create("zil_lwb_cache",
	sizeof (lwb_t), 0, zil_lwb_cons, zil_lwb_dest, NULL, NULL, NULL, 0);

	zil_zcw_cache = kmem_cache_create("zil_zcw_cache",
	sizeof (zil_commit_waiter_t), 0, NULL, NULL, NULL, NULL, NULL, 0);

	zil_ksp = kstat_create("zfs", 0, "zil", "misc",
	KSTAT_TYPE_NAMED, sizeof (zil_stats) / sizeof (kstat_named_t),
	KSTAT_FLAG_VIRTUAL);

	if (zil_ksp != NULL) {
	zil_ksp->ks_data = &zil_stats;
	kstat_install(zil_ksp);
	}
	}

	void
	zil_fini(void)
	{
	kmem_cache_destroy(zil_zcw_cache);
	kmem_cache_destroy(zil_lwb_cache);

	if (zil_ksp != NULL) {
	kstat_delete(zil_ksp);
	zil_ksp = NULL;
	}
	}

	void
	zil_set_sync(zilog_t *zilog, uint64_t sync)
	{
	zilog->zl_sync = sync;
	}

	void
	zil_set_logbias(zilog_t *zilog, uint64_t logbias)
	{
	zilog->zl_logbias = logbias;
	}

	zilog_t *
	zil_alloc(objset_t os, zil_header_t zh_phys)
	{
	zilog_t *zilog;

	zilog = kmem_zalloc(sizeof (zilog_t), KM_SLEEP);

	zilog->zl_header = zh_phys;
	zilog->zl_os = os;
	zilog->zl_spa = dmu_objset_spa(os);
	zilog->zl_dmu_pool = dmu_objset_pool(os);
	zilog->zl_destroy_txg = TXG_INITIAL - 1;
	zilog->zl_logbias = dmu_objset_logbias(os);
	zilog->zl_sync = dmu_objset_syncprop(os);
	zilog->zl_dirty_max_txg = 0;
	zilog->zl_last_lwb_opened = NULL;
	zilog->zl_last_lwb_latency = 0;
	zilog->zl_max_block_size = zil_maxblocksize;

	mutex_init(&zilog->zl_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&zilog->zl_issuer_lock, NULL, MUTEX_DEFAULT, NULL);

	for (int i = 0; i < TXG_SIZE; i++) {
	mutex_init(&zilog->zl_itxg[i].itxg_lock, NULL,
	MUTEX_DEFAULT, NULL);
	}

	list_create(&zilog->zl_lwb_list, sizeof (lwb_t),
	offsetof(lwb_t, lwb_node));

	list_create(&zilog->zl_itx_commit_list, sizeof (itx_t),
	offsetof(itx_t, itx_node));

	cv_init(&zilog->zl_cv_suspend, NULL, CV_DEFAULT, NULL);

	return (zilog);
	}

	void
	zil_free(zilog_t *zilog)
	{
	int i;

	zilog->zl_stop_sync = 1;

	ASSERT0(zilog->zl_suspend);
	ASSERT0(zilog->zl_suspending);

	ASSERT(list_is_empty(&zilog->zl_lwb_list));
	list_destroy(&zilog->zl_lwb_list);

	ASSERT(list_is_empty(&zilog->zl_itx_commit_list));
	list_destroy(&zilog->zl_itx_commit_list);

	for (i = 0; i < TXG_SIZE; i++) {
	/*
	* It's possible for an itx to be generated that doesn't dirty
	* a txg (e.g. ztest TX_TRUNCATE). So there's no zil_clean()
	* callback to remove the entry. We remove those here.
	*
	* Also free up the ziltest itxs.
	*/
	if (zilog->zl_itxg[i].itxg_itxs)
	zil_itxg_clean(zilog->zl_itxg[i].itxg_itxs);
	mutex_destroy(&zilog->zl_itxg[i].itxg_lock);
	}

	mutex_destroy(&zilog->zl_issuer_lock);
	mutex_destroy(&zilog->zl_lock);

	cv_destroy(&zilog->zl_cv_suspend);

	kmem_free(zilog, sizeof (zilog_t));
	}

	/*
	* Open an intent log.
	*/
	zilog_t *
	zil_open(objset_t os, zil_get_data_t get_data)
	{
	zilog_t *zilog = dmu_objset_zil(os);

	ASSERT3P(zilog->zl_get_data, ==, NULL);
	ASSERT3P(zilog->zl_last_lwb_opened, ==, NULL);
	ASSERT(list_is_empty(&zilog->zl_lwb_list));

	zilog->zl_get_data = get_data;

	return (zilog);
	}

	/*
	* Close an intent log.
	*/
	void
	zil_close(zilog_t *zilog)
	{
	lwb_t *lwb;
	uint64_t txg;

	if (!dmu_objset_is_snapshot(zilog->zl_os)) {
	zil_commit(zilog, 0);
	} else {
	ASSERT3P(list_tail(&zilog->zl_lwb_list), ==, NULL);
	ASSERT0(zilog->zl_dirty_max_txg);
	ASSERT3B(zilog_is_dirty(zilog), ==, B_FALSE);
	}

	mutex_enter(&zilog->zl_lock);
	lwb = list_tail(&zilog->zl_lwb_list);
	if (lwb == NULL)
	txg = zilog->zl_dirty_max_txg;
	else
	txg = MAX(zilog->zl_dirty_max_txg, lwb->lwb_max_txg);
	mutex_exit(&zilog->zl_lock);

	/*
	* We need to use txg_wait_synced() to wait long enough for the
	* ZIL to be clean, and to wait for all pending lwbs to be
	* written out.
	*/
	if (txg != 0)
	txg_wait_synced(zilog->zl_dmu_pool, txg);

	if (zilog_is_dirty(zilog))
	zfs_dbgmsg("zil (%px) is dirty, txg %llu", zilog,
	(u_longlong_t)txg);
	if (txg < spa_freeze_txg(zilog->zl_spa))
	VERIFY(!zilog_is_dirty(zilog));

	zilog->zl_get_data = NULL;

	/*
	* We should have only one lwb left on the list; remove it now.
	*/
	mutex_enter(&zilog->zl_lock);
	lwb = list_head(&zilog->zl_lwb_list);
	if (lwb != NULL) {
	ASSERT3P(lwb, ==, list_tail(&zilog->zl_lwb_list));
	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_ISSUED);

	if (lwb->lwb_fastwrite)
	metaslab_fastwrite_unmark(zilog->zl_spa, &lwb->lwb_blk);

	list_remove(&zilog->zl_lwb_list, lwb);
	zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
	zil_free_lwb(zilog, lwb);
	}
	mutex_exit(&zilog->zl_lock);
	}

	static char *suspend_tag = "zil suspending";

	/*
	* Suspend an intent log. While in suspended mode, we still honor
	* synchronous semantics, but we rely on txg_wait_synced() to do it.
	* On old version pools, we suspend the log briefly when taking a
	* snapshot so that it will have an empty intent log.
	*
	* Long holds are not really intended to be used the way we do here --
	* held for such a short time. A concurrent caller of dsl_dataset_long_held()
	* could fail. Therefore we take pains to only put a long hold if it is
	* actually necessary. Fortunately, it will only be necessary if the
	* objset is currently mounted (or the ZVOL equivalent). In that case it
	* will already have a long hold, so we are not really making things any worse.
	*
	* Ideally, we would locate the existing long-holder (i.e. the zfsvfs_t or
	* zvol_state_t), and use their mechanism to prevent their hold from being
	* dropped (e.g. VFS_HOLD()). However, that would be even more pain for
	* very little gain.
	*
	* if cookiep == NULL, this does both the suspend & resume.
	* Otherwise, it returns with the dataset "long held", and the cookie
	* should be passed into zil_resume().
	*/
	int
	zil_suspend(const char osname, void *cookiep)
	{
	objset_t *os;
	zilog_t *zilog;
	const zil_header_t *zh;
	int error;

	error = dmu_objset_hold(osname, suspend_tag, &os);
	if (error != 0)
	return (error);
	zilog = dmu_objset_zil(os);

	mutex_enter(&zilog->zl_lock);
	zh = zilog->zl_header;

	if (zh->zh_flags & ZIL_REPLAY_NEEDED) { /* unplayed log */
	mutex_exit(&zilog->zl_lock);
	dmu_objset_rele(os, suspend_tag);
	return (SET_ERROR(EBUSY));
	}

	/*
	* Don't put a long hold in the cases where we can avoid it. This
	* is when there is no cookie so we are doing a suspend & resume
	* (i.e. called from zil_vdev_offline()), and there's nothing to do
	* for the suspend because it's already suspended, or there's no ZIL.
	*/
	if (cookiep == NULL && !zilog->zl_suspending &&
	(zilog->zl_suspend > 0 \|\| BP_IS_HOLE(&zh->zh_log))) {
	mutex_exit(&zilog->zl_lock);
	dmu_objset_rele(os, suspend_tag);
	return (0);
	}

	dsl_dataset_long_hold(dmu_objset_ds(os), suspend_tag);
	dsl_pool_rele(dmu_objset_pool(os), suspend_tag);

	zilog->zl_suspend++;

	if (zilog->zl_suspend > 1) {
	/*
	* Someone else is already suspending it.
	* Just wait for them to finish.
	*/

	while (zilog->zl_suspending)
	cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock);
	mutex_exit(&zilog->zl_lock);

	if (cookiep == NULL)
	zil_resume(os);
	else
	*cookiep = os;
	return (0);
	}

	/*
	* If there is no pointer to an on-disk block, this ZIL must not
	* be active (e.g. filesystem not mounted), so there's nothing
	* to clean up.
	*/
	if (BP_IS_HOLE(&zh->zh_log)) {
	ASSERT(cookiep != NULL); /* fast path already handled */

	*cookiep = os;
	mutex_exit(&zilog->zl_lock);
	return (0);
	}

	/*
	* The ZIL has work to do. Ensure that the associated encryption
	* key will remain mapped while we are committing the log by
	* grabbing a reference to it. If the key isn't loaded we have no
	* choice but to return an error until the wrapping key is loaded.
	*/
	if (os->os_encrypted &&
	dsl_dataset_create_key_mapping(dmu_objset_ds(os)) != 0) {
	zilog->zl_suspend--;
	mutex_exit(&zilog->zl_lock);
	dsl_dataset_long_rele(dmu_objset_ds(os), suspend_tag);
	dsl_dataset_rele(dmu_objset_ds(os), suspend_tag);
	return (SET_ERROR(EACCES));
	}

	zilog->zl_suspending = B_TRUE;
	mutex_exit(&zilog->zl_lock);

	/*
	* We need to use zil_commit_impl to ensure we wait for all
	* LWB_STATE_OPENED and LWB_STATE_ISSUED lwbs to be committed
	* to disk before proceeding. If we used zil_commit instead, it
	* would just call txg_wait_synced(), because zl_suspend is set.
	* txg_wait_synced() doesn't wait for these lwb's to be
	* LWB_STATE_FLUSH_DONE before returning.
	*/
	zil_commit_impl(zilog, 0);

	/*
	* Now that we've ensured all lwb's are LWB_STATE_FLUSH_DONE, we
	* use txg_wait_synced() to ensure the data from the zilog has
	* migrated to the main pool before calling zil_destroy().
	*/
	txg_wait_synced(zilog->zl_dmu_pool, 0);

	zil_destroy(zilog, B_FALSE);

	mutex_enter(&zilog->zl_lock);
	zilog->zl_suspending = B_FALSE;
	cv_broadcast(&zilog->zl_cv_suspend);
	mutex_exit(&zilog->zl_lock);

	if (os->os_encrypted)
	dsl_dataset_remove_key_mapping(dmu_objset_ds(os));

	if (cookiep == NULL)
	zil_resume(os);
	else
	*cookiep = os;
	return (0);
	}

	void
	zil_resume(void *cookie)
	{
	objset_t *os = cookie;
	zilog_t *zilog = dmu_objset_zil(os);

	mutex_enter(&zilog->zl_lock);
	ASSERT(zilog->zl_suspend != 0);
	zilog->zl_suspend--;
	mutex_exit(&zilog->zl_lock);
	dsl_dataset_long_rele(dmu_objset_ds(os), suspend_tag);
	dsl_dataset_rele(dmu_objset_ds(os), suspend_tag);
	}

	typedef struct zil_replay_arg {
	zil_replay_func_t **zr_replay;
	void *zr_arg;
	boolean_t zr_byteswap;
	char *zr_lr;
	} zil_replay_arg_t;

	static int
	zil_replay_error(zilog_t zilog, const lr_t lr, int error)
	{
	char name[ZFS_MAX_DATASET_NAME_LEN];

	zilog->zl_replaying_seq--; /* didn't actually replay this one */

	dmu_objset_name(zilog->zl_os, name);

	cmn_err(CE_WARN, "ZFS replay transaction error %d, "
	"dataset %s, seq 0x%llx, txtype %llu %s\n", error, name,
	(u_longlong_t)lr->lrc_seq,
	(u_longlong_t)(lr->lrc_txtype & ~TX_CI),
	(lr->lrc_txtype & TX_CI) ? "CI" : "");

	return (error);
	}

	static int
	zil_replay_log_record(zilog_t zilog, const lr_t lr, void *zra,
	uint64_t claim_txg)
	{
	zil_replay_arg_t *zr = zra;
	const zil_header_t *zh = zilog->zl_header;
	uint64_t reclen = lr->lrc_reclen;
	uint64_t txtype = lr->lrc_txtype;
	int error = 0;

	zilog->zl_replaying_seq = lr->lrc_seq;

	if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */
	return (0);

	if (lr->lrc_txg < claim_txg) /* already committed */
	return (0);

	/* Strip case-insensitive bit, still present in log record */
	txtype &= ~TX_CI;

	if (txtype == 0 \|\| txtype >= TX_MAX_TYPE)
	return (zil_replay_error(zilog, lr, EINVAL));

	/*
	* If this record type can be logged out of order, the object
	* (lr_foid) may no longer exist. That's legitimate, not an error.
	*/
	if (TX_OOO(txtype)) {
	error = dmu_object_info(zilog->zl_os,
	LR_FOID_GET_OBJ(((lr_ooo_t *)lr)->lr_foid), NULL);
	if (error == ENOENT \|\| error == EEXIST)
	return (0);
	}

	/*
	* Make a copy of the data so we can revise and extend it.
	*/
	bcopy(lr, zr->zr_lr, reclen);

	/*
	* If this is a TX_WRITE with a blkptr, suck in the data.
	*/
	if (txtype == TX_WRITE && reclen == sizeof (lr_write_t)) {
	error = zil_read_log_data(zilog, (lr_write_t *)lr,
	zr->zr_lr + reclen);
	if (error != 0)
	return (zil_replay_error(zilog, lr, error));
	}

	/*
	* The log block containing this lr may have been byteswapped
	* so that we can easily examine common fields like lrc_txtype.
	* However, the log is a mix of different record types, and only the
	* replay vectors know how to byteswap their records. Therefore, if
	* the lr was byteswapped, undo it before invoking the replay vector.
	*/
	if (zr->zr_byteswap)
	byteswap_uint64_array(zr->zr_lr, reclen);

	/*
	* We must now do two things atomically: replay this log record,
	* and update the log header sequence number to reflect the fact that
	* we did so. At the end of each replay function the sequence number
	* is updated if we are in replay mode.
	*/
	error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lr, zr->zr_byteswap);
	if (error != 0) {
	/*
	* The DMU's dnode layer doesn't see removes until the txg
	* commits, so a subsequent claim can spuriously fail with
	* EEXIST. So if we receive any error we try syncing out
	* any removes then retry the transaction. Note that we
	* specify B_FALSE for byteswap now, so we don't do it twice.
	*/
	txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0);
	error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lr, B_FALSE);
	if (error != 0)
	return (zil_replay_error(zilog, lr, error));
	}
	return (0);
	}

	/* ARGSUSED */
	static int
	zil_incr_blks(zilog_t zilog, const blkptr_t bp, void *arg, uint64_t claim_txg)
	{
	zilog->zl_replay_blks++;

	return (0);
	}

	/*
	* If this dataset has a non-empty intent log, replay it and destroy it.
	*/
	void
	zil_replay(objset_t os, void arg, zil_replay_func_t *replay_func[TX_MAX_TYPE])
	{
	zilog_t *zilog = dmu_objset_zil(os);
	const zil_header_t *zh = zilog->zl_header;
	zil_replay_arg_t zr;

	if ((zh->zh_flags & ZIL_REPLAY_NEEDED) == 0) {
	zil_destroy(zilog, B_TRUE);
	return;
	}

	zr.zr_replay = replay_func;
	zr.zr_arg = arg;
	zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log);
	zr.zr_lr = vmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_SLEEP);

	/*
	* Wait for in-progress removes to sync before starting replay.
	*/
	txg_wait_synced(zilog->zl_dmu_pool, 0);

	zilog->zl_replay = B_TRUE;
	zilog->zl_replay_time = ddi_get_lbolt();
	ASSERT(zilog->zl_replay_blks == 0);
	(void) zil_parse(zilog, zil_incr_blks, zil_replay_log_record, &zr,
	zh->zh_claim_txg, B_TRUE);
	vmem_free(zr.zr_lr, 2 * SPA_MAXBLOCKSIZE);

	zil_destroy(zilog, B_FALSE);
	txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
	zilog->zl_replay = B_FALSE;
	}

	boolean_t
	zil_replaying(zilog_t zilog, dmu_tx_t tx)
	{
	if (zilog->zl_sync == ZFS_SYNC_DISABLED)
	return (B_TRUE);

	if (zilog->zl_replay) {
	dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
	zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] =
	zilog->zl_replaying_seq;
	return (B_TRUE);
	}

	return (B_FALSE);
	}

	/* ARGSUSED */
	int
	zil_reset(const char osname, void arg)
	{
	int error;

	error = zil_suspend(osname, NULL);
	/* EACCES means crypto key not loaded */
	if ((error == EACCES) \|\| (error == EBUSY))
	return (SET_ERROR(error));
	if (error != 0)
	return (SET_ERROR(EEXIST));
	return (0);
	}

	EXPORT_SYMBOL(zil_alloc);
	EXPORT_SYMBOL(zil_free);
	EXPORT_SYMBOL(zil_open);
	EXPORT_SYMBOL(zil_close);
	EXPORT_SYMBOL(zil_replay);
	EXPORT_SYMBOL(zil_replaying);
	EXPORT_SYMBOL(zil_destroy);
	EXPORT_SYMBOL(zil_destroy_sync);
	EXPORT_SYMBOL(zil_itx_create);
	EXPORT_SYMBOL(zil_itx_destroy);
	EXPORT_SYMBOL(zil_itx_assign);
	EXPORT_SYMBOL(zil_commit);
	EXPORT_SYMBOL(zil_claim);
	EXPORT_SYMBOL(zil_check_log_chain);
	EXPORT_SYMBOL(zil_sync);
	EXPORT_SYMBOL(zil_clean);
	EXPORT_SYMBOL(zil_suspend);
	EXPORT_SYMBOL(zil_resume);
	EXPORT_SYMBOL(zil_lwb_add_block);
	EXPORT_SYMBOL(zil_bp_tree_add);
	EXPORT_SYMBOL(zil_set_sync);
	EXPORT_SYMBOL(zil_set_logbias);

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs, zfs_, commit_timeout_pct, INT, ZMOD_RW,
	"ZIL block open timeout percentage");

	ZFS_MODULE_PARAM(zfs_zil, zil_, replay_disable, INT, ZMOD_RW,
	"Disable intent logging replay");

	ZFS_MODULE_PARAM(zfs_zil, zil_, nocacheflush, INT, ZMOD_RW,
	"Disable ZIL cache flushes");

	ZFS_MODULE_PARAM(zfs_zil, zil_, slog_bulk, ULONG, ZMOD_RW,
	"Limit in bytes slog sync writes per commit");

	ZFS_MODULE_PARAM(zfs_zil, zil_, maxblocksize, INT, ZMOD_RW,
	"Limit in bytes of ZIL log block size");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/zio.c b/sys/contrib/openzfs/module/zfs/zio.c
	index e33d36dab5f9..c016fa323b41 100644
	--- a/sys/contrib/openzfs/module/zfs/zio.c
	+++ b/sys/contrib/openzfs/module/zfs/zio.c
	@@ -1,5043 +1,5054 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
	* Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2017, Intel Corporation.
	* Copyright (c) 2019, Klara Inc.
	* Copyright (c) 2019, Allan Jude
	* Copyright (c) 2021, Datto, Inc.
	*/

	#include <sys/sysmacros.h>
	#include <sys/zfs_context.h>
	#include <sys/fm/fs/zfs.h>
	#include <sys/spa.h>
	#include <sys/txg.h>
	#include <sys/spa_impl.h>
	#include <sys/vdev_impl.h>
	#include <sys/vdev_trim.h>
	#include <sys/zio_impl.h>
	#include <sys/zio_compress.h>
	#include <sys/zio_checksum.h>
	#include <sys/dmu_objset.h>
	#include <sys/arc.h>
	#include <sys/ddt.h>
	#include <sys/blkptr.h>
	#include <sys/zfeature.h>
	#include <sys/dsl_scan.h>
	#include <sys/metaslab_impl.h>
	#include <sys/time.h>
	#include <sys/trace_zfs.h>
	#include <sys/abd.h>
	#include <sys/dsl_crypt.h>
	#include <cityhash.h>

	/*
	* ==========================================================================
	* I/O type descriptions
	* ==========================================================================
	*/
	const char *zio_type_name[ZIO_TYPES] = {
	/*
	* Note: Linux kernel thread name length is limited
	* so these names will differ from upstream open zfs.
	*/
	"z_null", "z_rd", "z_wr", "z_fr", "z_cl", "z_ioctl", "z_trim"
	};

	int zio_dva_throttle_enabled = B_TRUE;
	int zio_deadman_log_all = B_FALSE;

	/*
	* ==========================================================================
	* I/O kmem caches
	* ==========================================================================
	*/
	kmem_cache_t *zio_cache;
	kmem_cache_t *zio_link_cache;
	kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
	kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
	#if defined(ZFS_DEBUG) && !defined(_KERNEL)
	uint64_t zio_buf_cache_allocs[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
	uint64_t zio_buf_cache_frees[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
	#endif

	/* Mark IOs as "slow" if they take longer than 30 seconds */
	int zio_slow_io_ms = (30 * MILLISEC);

	#define BP_SPANB(indblkshift, level) \
	(((uint64_t)1) << ((level) * ((indblkshift) - SPA_BLKPTRSHIFT)))
	#define COMPARE_META_LEVEL 0x80000000ul
	/*
	* The following actions directly effect the spa's sync-to-convergence logic.
	* The values below define the sync pass when we start performing the action.
	* Care should be taken when changing these values as they directly impact
	* spa_sync() performance. Tuning these values may introduce subtle performance
	* pathologies and should only be done in the context of performance analysis.
	* These tunables will eventually be removed and replaced with #defines once
	* enough analysis has been done to determine optimal values.
	*
	* The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that
	* regular blocks are not deferred.
	*
	* Starting in sync pass 8 (zfs_sync_pass_dont_compress), we disable
	* compression (including of metadata). In practice, we don't have this
	* many sync passes, so this has no effect.
	*
	* The original intent was that disabling compression would help the sync
	* passes to converge. However, in practice disabling compression increases
	* the average number of sync passes, because when we turn compression off, a
	* lot of block's size will change and thus we have to re-allocate (not
	* overwrite) them. It also increases the number of 128KB allocations (e.g.
	* for indirect blocks and spacemaps) because these will not be compressed.
	* The 128K allocations are especially detrimental to performance on highly
	* fragmented systems, which may have very few free segments of this size,
	* and may need to load new metaslabs to satisfy 128K allocations.
	*/
	int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */
	int zfs_sync_pass_dont_compress = 8; /* don't compress starting in this pass */
	int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */

	/*
	* An allocating zio is one that either currently has the DVA allocate
	* stage set or will have it later in its lifetime.
	*/
	#define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE)

	/*
	* Enable smaller cores by excluding metadata
	* allocations as well.
	*/
	int zio_exclude_metadata = 0;
	int zio_requeue_io_start_cut_in_line = 1;

	#ifdef ZFS_DEBUG
	int zio_buf_debug_limit = 16384;
	#else
	int zio_buf_debug_limit = 0;
	#endif

	static inline void __zio_execute(zio_t *zio);

	static void zio_taskq_dispatch(zio_t *, zio_taskq_type_t, boolean_t);

	void
	zio_init(void)
	{
	size_t c;

	zio_cache = kmem_cache_create("zio_cache",
	sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
	zio_link_cache = kmem_cache_create("zio_link_cache",
	sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0);

	/*
	* For small buffers, we want a cache for each multiple of
	* SPA_MINBLOCKSIZE. For larger buffers, we want a cache
	* for each quarter-power of 2.
	*/
	for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) {
	size_t size = (c + 1) << SPA_MINBLOCKSHIFT;
	size_t p2 = size;
	size_t align = 0;
	size_t data_cflags, cflags;

	data_cflags = KMC_NODEBUG;
	cflags = (zio_exclude_metadata \|\| size > zio_buf_debug_limit) ?
	KMC_NODEBUG : 0;

	#if defined(_ILP32) && defined(_KERNEL)
	/*
	* Cache size limited to 1M on 32-bit platforms until ARC
	* buffers no longer require virtual address space.
	*/
	if (size > zfs_max_recordsize)
	break;
	#endif

	while (!ISP2(p2))
	p2 &= p2 - 1;

	#ifndef _KERNEL
	/*
	* If we are using watchpoints, put each buffer on its own page,
	* to eliminate the performance overhead of trapping to the
	* kernel when modifying a non-watched buffer that shares the
	* page with a watched buffer.
	*/
	if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE))
	continue;
	/*
	* Here's the problem - on 4K native devices in userland on
	* Linux using O_DIRECT, buffers must be 4K aligned or I/O
	* will fail with EINVAL, causing zdb (and others) to coredump.
	* Since userland probably doesn't need optimized buffer caches,
	* we just force 4K alignment on everything.
	*/
	align = 8 * SPA_MINBLOCKSIZE;
	#else
	if (size < PAGESIZE) {
	align = SPA_MINBLOCKSIZE;
	} else if (IS_P2ALIGNED(size, p2 >> 2)) {
	align = PAGESIZE;
	}
	#endif

	if (align != 0) {
	char name[36];
	if (cflags == data_cflags) {
	/*
	* Resulting kmem caches would be identical.
	* Save memory by creating only one.
	*/
	(void) snprintf(name, sizeof (name),
	"zio_buf_comb_%lu", (ulong_t)size);
	zio_buf_cache[c] = kmem_cache_create(name,
	size, align, NULL, NULL, NULL, NULL, NULL,
	cflags);
	zio_data_buf_cache[c] = zio_buf_cache[c];
	continue;
	}
	(void) snprintf(name, sizeof (name), "zio_buf_%lu",
	(ulong_t)size);
	zio_buf_cache[c] = kmem_cache_create(name, size,
	align, NULL, NULL, NULL, NULL, NULL, cflags);

	(void) snprintf(name, sizeof (name), "zio_data_buf_%lu",
	(ulong_t)size);
	zio_data_buf_cache[c] = kmem_cache_create(name, size,
	align, NULL, NULL, NULL, NULL, NULL, data_cflags);
	}
	}

	while (--c != 0) {
	ASSERT(zio_buf_cache[c] != NULL);
	if (zio_buf_cache[c - 1] == NULL)
	zio_buf_cache[c - 1] = zio_buf_cache[c];

	ASSERT(zio_data_buf_cache[c] != NULL);
	if (zio_data_buf_cache[c - 1] == NULL)
	zio_data_buf_cache[c - 1] = zio_data_buf_cache[c];
	}

	zio_inject_init();

	lz4_init();
	}

	void
	zio_fini(void)
	{
	size_t n = SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT;

	#if defined(ZFS_DEBUG) && !defined(_KERNEL)
	for (size_t i = 0; i < n; i++) {
	if (zio_buf_cache_allocs[i] != zio_buf_cache_frees[i])
	(void) printf("zio_fini: [%d] %llu != %llu\n",
	(int)((i + 1) << SPA_MINBLOCKSHIFT),
	(long long unsigned)zio_buf_cache_allocs[i],
	(long long unsigned)zio_buf_cache_frees[i]);
	}
	#endif

	/*
	* The same kmem cache can show up multiple times in both zio_buf_cache
	* and zio_data_buf_cache. Do a wasteful but trivially correct scan to
	* sort it out.
	*/
	for (size_t i = 0; i < n; i++) {
	kmem_cache_t *cache = zio_buf_cache[i];
	if (cache == NULL)
	continue;
	for (size_t j = i; j < n; j++) {
	if (cache == zio_buf_cache[j])
	zio_buf_cache[j] = NULL;
	if (cache == zio_data_buf_cache[j])
	zio_data_buf_cache[j] = NULL;
	}
	kmem_cache_destroy(cache);
	}

	for (size_t i = 0; i < n; i++) {
	kmem_cache_t *cache = zio_data_buf_cache[i];
	if (cache == NULL)
	continue;
	for (size_t j = i; j < n; j++) {
	if (cache == zio_data_buf_cache[j])
	zio_data_buf_cache[j] = NULL;
	}
	kmem_cache_destroy(cache);
	}

	for (size_t i = 0; i < n; i++) {
	VERIFY3P(zio_buf_cache[i], ==, NULL);
	VERIFY3P(zio_data_buf_cache[i], ==, NULL);
	}

	kmem_cache_destroy(zio_link_cache);
	kmem_cache_destroy(zio_cache);

	zio_inject_fini();

	lz4_fini();
	}

	/*
	* ==========================================================================
	* Allocate and free I/O buffers
	* ==========================================================================
	*/

	/*
	* Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a
	* crashdump if the kernel panics, so use it judiciously. Obviously, it's
	* useful to inspect ZFS metadata, but if possible, we should avoid keeping
	* excess / transient data in-core during a crashdump.
	*/
	void *
	zio_buf_alloc(size_t size)
	{
	size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;

	VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
	#if defined(ZFS_DEBUG) && !defined(_KERNEL)
	atomic_add_64(&zio_buf_cache_allocs[c], 1);
	#endif

	return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE));
	}

	/*
	* Use zio_data_buf_alloc to allocate data. The data will not appear in a
	* crashdump if the kernel panics. This exists so that we will limit the amount
	* of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount
	* of kernel heap dumped to disk when the kernel panics)
	*/
	void *
	zio_data_buf_alloc(size_t size)
	{
	size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;

	VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);

	return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE));
	}

	void
	zio_buf_free(void *buf, size_t size)
	{
	size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;

	VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
	#if defined(ZFS_DEBUG) && !defined(_KERNEL)
	atomic_add_64(&zio_buf_cache_frees[c], 1);
	#endif

	kmem_cache_free(zio_buf_cache[c], buf);
	}

	void
	zio_data_buf_free(void *buf, size_t size)
	{
	size_t c = (size - 1) >> SPA_MINBLOCKSHIFT;

	VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);

	kmem_cache_free(zio_data_buf_cache[c], buf);
	}

	static void
	zio_abd_free(void *abd, size_t size)
	{
	abd_free((abd_t *)abd);
	}

	/*
	* ==========================================================================
	* Push and pop I/O transform buffers
	* ==========================================================================
	*/
	void
	zio_push_transform(zio_t zio, abd_t data, uint64_t size, uint64_t bufsize,
	zio_transform_func_t *transform)
	{
	zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP);

	zt->zt_orig_abd = zio->io_abd;
	zt->zt_orig_size = zio->io_size;
	zt->zt_bufsize = bufsize;
	zt->zt_transform = transform;

	zt->zt_next = zio->io_transform_stack;
	zio->io_transform_stack = zt;

	zio->io_abd = data;
	zio->io_size = size;
	}

	void
	zio_pop_transforms(zio_t *zio)
	{
	zio_transform_t *zt;

	while ((zt = zio->io_transform_stack) != NULL) {
	if (zt->zt_transform != NULL)
	zt->zt_transform(zio,
	zt->zt_orig_abd, zt->zt_orig_size);

	if (zt->zt_bufsize != 0)
	abd_free(zio->io_abd);

	zio->io_abd = zt->zt_orig_abd;
	zio->io_size = zt->zt_orig_size;
	zio->io_transform_stack = zt->zt_next;

	kmem_free(zt, sizeof (zio_transform_t));
	}
	}

	/*
	* ==========================================================================
	* I/O transform callbacks for subblocks, decompression, and decryption
	* ==========================================================================
	*/
	static void
	zio_subblock(zio_t zio, abd_t data, uint64_t size)
	{
	ASSERT(zio->io_size > size);

	if (zio->io_type == ZIO_TYPE_READ)
	abd_copy(data, zio->io_abd, size);
	}

	static void
	zio_decompress(zio_t zio, abd_t data, uint64_t size)
	{
	if (zio->io_error == 0) {
	void *tmp = abd_borrow_buf(data, size);
	int ret = zio_decompress_data(BP_GET_COMPRESS(zio->io_bp),
	zio->io_abd, tmp, zio->io_size, size,
	&zio->io_prop.zp_complevel);
	abd_return_buf_copy(data, tmp, size);

	if (zio_injection_enabled && ret == 0)
	ret = zio_handle_fault_injection(zio, EINVAL);

	if (ret != 0)
	zio->io_error = SET_ERROR(EIO);
	}
	}

	static void
	zio_decrypt(zio_t zio, abd_t data, uint64_t size)
	{
	int ret;
	void *tmp;
	blkptr_t *bp = zio->io_bp;
	spa_t *spa = zio->io_spa;
	uint64_t dsobj = zio->io_bookmark.zb_objset;
	uint64_t lsize = BP_GET_LSIZE(bp);
	dmu_object_type_t ot = BP_GET_TYPE(bp);
	uint8_t salt[ZIO_DATA_SALT_LEN];
	uint8_t iv[ZIO_DATA_IV_LEN];
	uint8_t mac[ZIO_DATA_MAC_LEN];
	boolean_t no_crypt = B_FALSE;

	ASSERT(BP_USES_CRYPT(bp));
	ASSERT3U(size, !=, 0);

	if (zio->io_error != 0)
	return;

	/*
	* Verify the cksum of MACs stored in an indirect bp. It will always
	* be possible to verify this since it does not require an encryption
	* key.
	*/
	if (BP_HAS_INDIRECT_MAC_CKSUM(bp)) {
	zio_crypt_decode_mac_bp(bp, mac);

	if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF) {
	/*
	* We haven't decompressed the data yet, but
	* zio_crypt_do_indirect_mac_checksum() requires
	* decompressed data to be able to parse out the MACs
	* from the indirect block. We decompress it now and
	* throw away the result after we are finished.
	*/
	tmp = zio_buf_alloc(lsize);
	ret = zio_decompress_data(BP_GET_COMPRESS(bp),
	zio->io_abd, tmp, zio->io_size, lsize,
	&zio->io_prop.zp_complevel);
	if (ret != 0) {
	ret = SET_ERROR(EIO);
	goto error;
	}
	ret = zio_crypt_do_indirect_mac_checksum(B_FALSE,
	tmp, lsize, BP_SHOULD_BYTESWAP(bp), mac);
	zio_buf_free(tmp, lsize);
	} else {
	ret = zio_crypt_do_indirect_mac_checksum_abd(B_FALSE,
	zio->io_abd, size, BP_SHOULD_BYTESWAP(bp), mac);
	}
	abd_copy(data, zio->io_abd, size);

	if (zio_injection_enabled && ot != DMU_OT_DNODE && ret == 0) {
	ret = zio_handle_decrypt_injection(spa,
	&zio->io_bookmark, ot, ECKSUM);
	}
	if (ret != 0)
	goto error;

	return;
	}

	/*
	* If this is an authenticated block, just check the MAC. It would be
	* nice to separate this out into its own flag, but for the moment
	* enum zio_flag is out of bits.
	*/
	if (BP_IS_AUTHENTICATED(bp)) {
	if (ot == DMU_OT_OBJSET) {
	ret = spa_do_crypt_objset_mac_abd(B_FALSE, spa,
	dsobj, zio->io_abd, size, BP_SHOULD_BYTESWAP(bp));
	} else {
	zio_crypt_decode_mac_bp(bp, mac);
	ret = spa_do_crypt_mac_abd(B_FALSE, spa, dsobj,
	zio->io_abd, size, mac);
	if (zio_injection_enabled && ret == 0) {
	ret = zio_handle_decrypt_injection(spa,
	&zio->io_bookmark, ot, ECKSUM);
	}
	}
	abd_copy(data, zio->io_abd, size);

	if (ret != 0)
	goto error;

	return;
	}

	zio_crypt_decode_params_bp(bp, salt, iv);

	if (ot == DMU_OT_INTENT_LOG) {
	tmp = abd_borrow_buf_copy(zio->io_abd, sizeof (zil_chain_t));
	zio_crypt_decode_mac_zil(tmp, mac);
	abd_return_buf(zio->io_abd, tmp, sizeof (zil_chain_t));
	} else {
	zio_crypt_decode_mac_bp(bp, mac);
	}

	ret = spa_do_crypt_abd(B_FALSE, spa, &zio->io_bookmark, BP_GET_TYPE(bp),
	BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp), salt, iv, mac, size, data,
	zio->io_abd, &no_crypt);
	if (no_crypt)
	abd_copy(data, zio->io_abd, size);

	if (ret != 0)
	goto error;

	return;

	error:
	/* assert that the key was found unless this was speculative */
	ASSERT(ret != EACCES \|\| (zio->io_flags & ZIO_FLAG_SPECULATIVE));

	/*
	* If there was a decryption / authentication error return EIO as
	* the io_error. If this was not a speculative zio, create an ereport.
	*/
	if (ret == ECKSUM) {
	zio->io_error = SET_ERROR(EIO);
	if ((zio->io_flags & ZIO_FLAG_SPECULATIVE) == 0) {
	spa_log_error(spa, &zio->io_bookmark);
	(void) zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION,
	spa, NULL, &zio->io_bookmark, zio, 0);
	}
	} else {
	zio->io_error = ret;
	}
	}

	/*
	* ==========================================================================
	* I/O parent/child relationships and pipeline interlocks
	* ==========================================================================
	*/
	zio_t *
	zio_walk_parents(zio_t cio, zio_link_t *zl)
	{
	list_t *pl = &cio->io_parent_list;

	zl = (zl == NULL) ? list_head(pl) : list_next(pl, *zl);
	if (*zl == NULL)
	return (NULL);

	ASSERT((*zl)->zl_child == cio);
	return ((*zl)->zl_parent);
	}

	zio_t *
	zio_walk_children(zio_t pio, zio_link_t *zl)
	{
	list_t *cl = &pio->io_child_list;

	ASSERT(MUTEX_HELD(&pio->io_lock));

	zl = (zl == NULL) ? list_head(cl) : list_next(cl, *zl);
	if (*zl == NULL)
	return (NULL);

	ASSERT((*zl)->zl_parent == pio);
	return ((*zl)->zl_child);
	}

	zio_t *
	zio_unique_parent(zio_t *cio)
	{
	zio_link_t *zl = NULL;
	zio_t *pio = zio_walk_parents(cio, &zl);

	VERIFY3P(zio_walk_parents(cio, &zl), ==, NULL);
	return (pio);
	}

	void
	zio_add_child(zio_t pio, zio_t cio)
	{
	zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP);

	/*
	* Logical I/Os can have logical, gang, or vdev children.
	* Gang I/Os can have gang or vdev children.
	* Vdev I/Os can only have vdev children.
	* The following ASSERT captures all of these constraints.
	*/
	ASSERT3S(cio->io_child_type, <=, pio->io_child_type);

	zl->zl_parent = pio;
	zl->zl_child = cio;

	mutex_enter(&pio->io_lock);
	mutex_enter(&cio->io_lock);

	ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0);

	for (int w = 0; w < ZIO_WAIT_TYPES; w++)
	pio->io_children[cio->io_child_type][w] += !cio->io_state[w];

	list_insert_head(&pio->io_child_list, zl);
	list_insert_head(&cio->io_parent_list, zl);

	pio->io_child_count++;
	cio->io_parent_count++;

	mutex_exit(&cio->io_lock);
	mutex_exit(&pio->io_lock);
	}

	static void
	zio_remove_child(zio_t pio, zio_t cio, zio_link_t *zl)
	{
	ASSERT(zl->zl_parent == pio);
	ASSERT(zl->zl_child == cio);

	mutex_enter(&pio->io_lock);
	mutex_enter(&cio->io_lock);

	list_remove(&pio->io_child_list, zl);
	list_remove(&cio->io_parent_list, zl);

	pio->io_child_count--;
	cio->io_parent_count--;

	mutex_exit(&cio->io_lock);
	mutex_exit(&pio->io_lock);
	kmem_cache_free(zio_link_cache, zl);
	}

	static boolean_t
	zio_wait_for_children(zio_t *zio, uint8_t childbits, enum zio_wait_type wait)
	{
	boolean_t waiting = B_FALSE;

	mutex_enter(&zio->io_lock);
	ASSERT(zio->io_stall == NULL);
	for (int c = 0; c < ZIO_CHILD_TYPES; c++) {
	if (!(ZIO_CHILD_BIT_IS_SET(childbits, c)))
	continue;

	uint64_t *countp = &zio->io_children[c][wait];
	if (*countp != 0) {
	zio->io_stage >>= 1;
	ASSERT3U(zio->io_stage, !=, ZIO_STAGE_OPEN);
	zio->io_stall = countp;
	waiting = B_TRUE;
	break;
	}
	}
	mutex_exit(&zio->io_lock);
	return (waiting);
	}

	__attribute__((always_inline))
	static inline void
	zio_notify_parent(zio_t pio, zio_t zio, enum zio_wait_type wait,
	zio_t **next_to_executep)
	{
	uint64_t *countp = &pio->io_children[zio->io_child_type][wait];
	int *errorp = &pio->io_child_error[zio->io_child_type];

	mutex_enter(&pio->io_lock);
	if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE))
	errorp = zio_worst_error(errorp, zio->io_error);
	pio->io_reexecute \|= zio->io_reexecute;
	ASSERT3U(*countp, >, 0);

	(*countp)--;

	if (*countp == 0 && pio->io_stall == countp) {
	zio_taskq_type_t type =
	pio->io_stage < ZIO_STAGE_VDEV_IO_START ? ZIO_TASKQ_ISSUE :
	ZIO_TASKQ_INTERRUPT;
	pio->io_stall = NULL;
	mutex_exit(&pio->io_lock);

	/*
	* If we can tell the caller to execute this parent next, do
	* so. Otherwise dispatch the parent zio as its own task.
	*
	* Having the caller execute the parent when possible reduces
	* locking on the zio taskq's, reduces context switch
	* overhead, and has no recursion penalty. Note that one
	* read from disk typically causes at least 3 zio's: a
	* zio_null(), the logical zio_read(), and then a physical
	* zio. When the physical ZIO completes, we are able to call
	* zio_done() on all 3 of these zio's from one invocation of
	* zio_execute() by returning the parent back to
	* zio_execute(). Since the parent isn't executed until this
	* thread returns back to zio_execute(), the caller should do
	* so promptly.
	*
	* In other cases, dispatching the parent prevents
	* overflowing the stack when we have deeply nested
	* parent-child relationships, as we do with the "mega zio"
	* of writes for spa_sync(), and the chain of ZIL blocks.
	*/
	if (next_to_executep != NULL && *next_to_executep == NULL) {
	*next_to_executep = pio;
	} else {
	zio_taskq_dispatch(pio, type, B_FALSE);
	}
	} else {
	mutex_exit(&pio->io_lock);
	}
	}

	static void
	zio_inherit_child_errors(zio_t *zio, enum zio_child c)
	{
	if (zio->io_child_error[c] != 0 && zio->io_error == 0)
	zio->io_error = zio->io_child_error[c];
	}

	int
	zio_bookmark_compare(const void x1, const void x2)
	{
	const zio_t *z1 = x1;
	const zio_t *z2 = x2;

	if (z1->io_bookmark.zb_objset < z2->io_bookmark.zb_objset)
	return (-1);
	if (z1->io_bookmark.zb_objset > z2->io_bookmark.zb_objset)
	return (1);

	if (z1->io_bookmark.zb_object < z2->io_bookmark.zb_object)
	return (-1);
	if (z1->io_bookmark.zb_object > z2->io_bookmark.zb_object)
	return (1);

	if (z1->io_bookmark.zb_level < z2->io_bookmark.zb_level)
	return (-1);
	if (z1->io_bookmark.zb_level > z2->io_bookmark.zb_level)
	return (1);

	if (z1->io_bookmark.zb_blkid < z2->io_bookmark.zb_blkid)
	return (-1);
	if (z1->io_bookmark.zb_blkid > z2->io_bookmark.zb_blkid)
	return (1);

	if (z1 < z2)
	return (-1);
	if (z1 > z2)
	return (1);

	return (0);
	}

	/*
	* ==========================================================================
	* Create the various types of I/O (read, write, free, etc)
	* ==========================================================================
	*/
	static zio_t *
	zio_create(zio_t pio, spa_t spa, uint64_t txg, const blkptr_t *bp,
	abd_t data, uint64_t lsize, uint64_t psize, zio_done_func_t done,
	void *private, zio_type_t type, zio_priority_t priority,
	enum zio_flag flags, vdev_t *vd, uint64_t offset,
	const zbookmark_phys_t *zb, enum zio_stage stage,
	enum zio_stage pipeline)
	{
	zio_t *zio;

	IMPLY(type != ZIO_TYPE_TRIM, psize <= SPA_MAXBLOCKSIZE);
	ASSERT(P2PHASE(psize, SPA_MINBLOCKSIZE) == 0);
	ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0);

	ASSERT(!vd \|\| spa_config_held(spa, SCL_STATE_ALL, RW_READER));
	ASSERT(!bp \|\| !(flags & ZIO_FLAG_CONFIG_WRITER));
	ASSERT(vd \|\| stage == ZIO_STAGE_OPEN);

	IMPLY(lsize != psize, (flags & ZIO_FLAG_RAW_COMPRESS) != 0);

	zio = kmem_cache_alloc(zio_cache, KM_SLEEP);
	bzero(zio, sizeof (zio_t));

	mutex_init(&zio->io_lock, NULL, MUTEX_NOLOCKDEP, NULL);
	cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL);

	list_create(&zio->io_parent_list, sizeof (zio_link_t),
	offsetof(zio_link_t, zl_parent_node));
	list_create(&zio->io_child_list, sizeof (zio_link_t),
	offsetof(zio_link_t, zl_child_node));
	metaslab_trace_init(&zio->io_alloc_list);

	if (vd != NULL)
	zio->io_child_type = ZIO_CHILD_VDEV;
	else if (flags & ZIO_FLAG_GANG_CHILD)
	zio->io_child_type = ZIO_CHILD_GANG;
	else if (flags & ZIO_FLAG_DDT_CHILD)
	zio->io_child_type = ZIO_CHILD_DDT;
	else
	zio->io_child_type = ZIO_CHILD_LOGICAL;

	if (bp != NULL) {
	zio->io_bp = (blkptr_t *)bp;
	zio->io_bp_copy = *bp;
	zio->io_bp_orig = *bp;
	if (type != ZIO_TYPE_WRITE \|\|
	zio->io_child_type == ZIO_CHILD_DDT)
	zio->io_bp = &zio->io_bp_copy; /* so caller can free */
	if (zio->io_child_type == ZIO_CHILD_LOGICAL)
	zio->io_logical = zio;
	if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp))
	pipeline \|= ZIO_GANG_STAGES;
	}

	zio->io_spa = spa;
	zio->io_txg = txg;
	zio->io_done = done;
	zio->io_private = private;
	zio->io_type = type;
	zio->io_priority = priority;
	zio->io_vd = vd;
	zio->io_offset = offset;
	zio->io_orig_abd = zio->io_abd = data;
	zio->io_orig_size = zio->io_size = psize;
	zio->io_lsize = lsize;
	zio->io_orig_flags = zio->io_flags = flags;
	zio->io_orig_stage = zio->io_stage = stage;
	zio->io_orig_pipeline = zio->io_pipeline = pipeline;
	zio->io_pipeline_trace = ZIO_STAGE_OPEN;

	zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY);
	zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE);

	if (zb != NULL)
	zio->io_bookmark = *zb;

	if (pio != NULL) {
	- if (zio->io_metaslab_class == NULL)
	- zio->io_metaslab_class = pio->io_metaslab_class;
	+ zio->io_metaslab_class = pio->io_metaslab_class;
	if (zio->io_logical == NULL)
	zio->io_logical = pio->io_logical;
	if (zio->io_child_type == ZIO_CHILD_GANG)
	zio->io_gang_leader = pio->io_gang_leader;
	zio_add_child(pio, zio);
	}

	taskq_init_ent(&zio->io_tqent);

	return (zio);
	}

	static void
	zio_destroy(zio_t *zio)
	{
	metaslab_trace_fini(&zio->io_alloc_list);
	list_destroy(&zio->io_parent_list);
	list_destroy(&zio->io_child_list);
	mutex_destroy(&zio->io_lock);
	cv_destroy(&zio->io_cv);
	kmem_cache_free(zio_cache, zio);
	}

	zio_t *
	zio_null(zio_t pio, spa_t spa, vdev_t vd, zio_done_func_t done,
	void *private, enum zio_flag flags)
	{
	zio_t *zio;

	zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private,
	ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL,
	ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE);

	return (zio);
	}

	zio_t *
	zio_root(spa_t spa, zio_done_func_t done, void *private, enum zio_flag flags)
	{
	return (zio_null(NULL, spa, NULL, done, private, flags));
	}

	static int
	zfs_blkptr_verify_log(spa_t spa, const blkptr_t bp,
	enum blk_verify_flag blk_verify, const char *fmt, ...)
	{
	va_list adx;
	char buf[256];

	va_start(adx, fmt);
	(void) vsnprintf(buf, sizeof (buf), fmt, adx);
	va_end(adx);

	switch (blk_verify) {
	case BLK_VERIFY_HALT:
	dprintf_bp(bp, "blkptr at %p dprintf_bp():", bp);
	zfs_panic_recover("%s: %s", spa_name(spa), buf);
	break;
	case BLK_VERIFY_LOG:
	zfs_dbgmsg("%s: %s", spa_name(spa), buf);
	break;
	case BLK_VERIFY_ONLY:
	break;
	}

	return (1);
	}

	/*
	* Verify the block pointer fields contain reasonable values. This means
	* it only contains known object types, checksum/compression identifiers,
	* block sizes within the maximum allowed limits, valid DVAs, etc.
	*
	* If everything checks out B_TRUE is returned. The zfs_blkptr_verify
	* argument controls the behavior when an invalid field is detected.
	*
	* Modes for zfs_blkptr_verify:
	* 1) BLK_VERIFY_ONLY (evaluate the block)
	* 2) BLK_VERIFY_LOG (evaluate the block and log problems)
	* 3) BLK_VERIFY_HALT (call zfs_panic_recover on error)
	*/
	boolean_t
	zfs_blkptr_verify(spa_t spa, const blkptr_t bp, boolean_t config_held,
	enum blk_verify_flag blk_verify)
	{
	int errors = 0;

	if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp))) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p has invalid TYPE %llu",
	bp, (longlong_t)BP_GET_TYPE(bp));
	}
	if (BP_GET_CHECKSUM(bp) >= ZIO_CHECKSUM_FUNCTIONS \|\|
	BP_GET_CHECKSUM(bp) <= ZIO_CHECKSUM_ON) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p has invalid CHECKSUM %llu",
	bp, (longlong_t)BP_GET_CHECKSUM(bp));
	}
	if (BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_FUNCTIONS \|\|
	BP_GET_COMPRESS(bp) <= ZIO_COMPRESS_ON) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p has invalid COMPRESS %llu",
	bp, (longlong_t)BP_GET_COMPRESS(bp));
	}
	if (BP_GET_LSIZE(bp) > SPA_MAXBLOCKSIZE) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p has invalid LSIZE %llu",
	bp, (longlong_t)BP_GET_LSIZE(bp));
	}
	if (BP_GET_PSIZE(bp) > SPA_MAXBLOCKSIZE) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p has invalid PSIZE %llu",
	bp, (longlong_t)BP_GET_PSIZE(bp));
	}

	if (BP_IS_EMBEDDED(bp)) {
	if (BPE_GET_ETYPE(bp) >= NUM_BP_EMBEDDED_TYPES) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p has invalid ETYPE %llu",
	bp, (longlong_t)BPE_GET_ETYPE(bp));
	}
	}

	/*
	* Do not verify individual DVAs if the config is not trusted. This
	* will be done once the zio is executed in vdev_mirror_map_alloc.
	*/
	if (!spa->spa_trust_config)
	- return (B_TRUE);
	+ return (errors == 0);

	if (!config_held)
	spa_config_enter(spa, SCL_VDEV, bp, RW_READER);
	else
	ASSERT(spa_config_held(spa, SCL_VDEV, RW_WRITER));
	/*
	* Pool-specific checks.
	*
	* Note: it would be nice to verify that the blk_birth and
	* BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze()
	* allows the birth time of log blocks (and dmu_sync()-ed blocks
	* that are in the log) to be arbitrarily large.
	*/
	for (int i = 0; i < BP_GET_NDVAS(bp); i++) {
	const dva_t *dva = &bp->blk_dva[i];
	uint64_t vdevid = DVA_GET_VDEV(dva);

	if (vdevid >= spa->spa_root_vdev->vdev_children) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p DVA %u has invalid VDEV %llu",
	bp, i, (longlong_t)vdevid);
	continue;
	}
	vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid];
	if (vd == NULL) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p DVA %u has invalid VDEV %llu",
	bp, i, (longlong_t)vdevid);
	continue;
	}
	if (vd->vdev_ops == &vdev_hole_ops) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p DVA %u has hole VDEV %llu",
	bp, i, (longlong_t)vdevid);
	continue;
	}
	if (vd->vdev_ops == &vdev_missing_ops) {
	/*
	* "missing" vdevs are valid during import, but we
	* don't have their detailed info (e.g. asize), so
	* we can't perform any more checks on them.
	*/
	continue;
	}
	uint64_t offset = DVA_GET_OFFSET(dva);
	uint64_t asize = DVA_GET_ASIZE(dva);
	if (DVA_GET_GANG(dva))
	asize = vdev_gang_header_asize(vd);
	if (offset + asize > vd->vdev_asize) {
	errors += zfs_blkptr_verify_log(spa, bp, blk_verify,
	"blkptr at %p DVA %u has invalid OFFSET %llu",
	bp, i, (longlong_t)offset);
	}
	}
	if (errors > 0)
	dprintf_bp(bp, "blkptr at %p dprintf_bp():", bp);
	if (!config_held)
	spa_config_exit(spa, SCL_VDEV, bp);

	return (errors == 0);
	}

	boolean_t
	zfs_dva_valid(spa_t spa, const dva_t dva, const blkptr_t *bp)
	{
	uint64_t vdevid = DVA_GET_VDEV(dva);

	if (vdevid >= spa->spa_root_vdev->vdev_children)
	return (B_FALSE);

	vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid];
	if (vd == NULL)
	return (B_FALSE);

	if (vd->vdev_ops == &vdev_hole_ops)
	return (B_FALSE);

	if (vd->vdev_ops == &vdev_missing_ops) {
	return (B_FALSE);
	}

	uint64_t offset = DVA_GET_OFFSET(dva);
	uint64_t asize = DVA_GET_ASIZE(dva);

	if (DVA_GET_GANG(dva))
	asize = vdev_gang_header_asize(vd);
	if (offset + asize > vd->vdev_asize)
	return (B_FALSE);

	return (B_TRUE);
	}

	zio_t *
	zio_read(zio_t pio, spa_t spa, const blkptr_t *bp,
	abd_t data, uint64_t size, zio_done_func_t done, void *private,
	zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb)
	{
	zio_t *zio;

	zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp,
	data, size, size, done, private,
	ZIO_TYPE_READ, priority, flags, NULL, 0, zb,
	ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ?
	ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE);

	return (zio);
	}

	zio_t *
	zio_write(zio_t pio, spa_t spa, uint64_t txg, blkptr_t *bp,
	abd_t data, uint64_t lsize, uint64_t psize, const zio_prop_t zp,
	zio_done_func_t ready, zio_done_func_t children_ready,
	zio_done_func_t physdone, zio_done_func_t done,
	void *private, zio_priority_t priority, enum zio_flag flags,
	const zbookmark_phys_t *zb)
	{
	zio_t *zio;

	ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF &&
	zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS &&
	zp->zp_compress >= ZIO_COMPRESS_OFF &&
	zp->zp_compress < ZIO_COMPRESS_FUNCTIONS &&
	DMU_OT_IS_VALID(zp->zp_type) &&
	zp->zp_level < 32 &&
	zp->zp_copies > 0 &&
	zp->zp_copies <= spa_max_replication(spa));

	zio = zio_create(pio, spa, txg, bp, data, lsize, psize, done, private,
	ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb,
	ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ?
	ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE);

	zio->io_ready = ready;
	zio->io_children_ready = children_ready;
	zio->io_physdone = physdone;
	zio->io_prop = *zp;

	/*
	* Data can be NULL if we are going to call zio_write_override() to
	* provide the already-allocated BP. But we may need the data to
	* verify a dedup hit (if requested). In this case, don't try to
	* dedup (just take the already-allocated BP verbatim). Encrypted
	* dedup blocks need data as well so we also disable dedup in this
	* case.
	*/
	if (data == NULL &&
	(zio->io_prop.zp_dedup_verify \|\| zio->io_prop.zp_encrypt)) {
	zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE;
	}

	return (zio);
	}

	zio_t *
	zio_rewrite(zio_t pio, spa_t spa, uint64_t txg, blkptr_t bp, abd_t data,
	uint64_t size, zio_done_func_t done, void private,
	zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb)
	{
	zio_t *zio;

	zio = zio_create(pio, spa, txg, bp, data, size, size, done, private,
	ZIO_TYPE_WRITE, priority, flags \| ZIO_FLAG_IO_REWRITE, NULL, 0, zb,
	ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE);

	return (zio);
	}

	void
	zio_write_override(zio_t zio, blkptr_t bp, int copies, boolean_t nopwrite)
	{
	ASSERT(zio->io_type == ZIO_TYPE_WRITE);
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
	ASSERT(zio->io_stage == ZIO_STAGE_OPEN);
	ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa));

	/*
	* We must reset the io_prop to match the values that existed
	* when the bp was first written by dmu_sync() keeping in mind
	* that nopwrite and dedup are mutually exclusive.
	*/
	zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup;
	zio->io_prop.zp_nopwrite = nopwrite;
	zio->io_prop.zp_copies = copies;
	zio->io_bp_override = bp;
	}

	void
	zio_free(spa_t spa, uint64_t txg, const blkptr_t bp)
	{

	(void) zfs_blkptr_verify(spa, bp, B_FALSE, BLK_VERIFY_HALT);

	/*
	* The check for EMBEDDED is a performance optimization. We
	* process the free here (by ignoring it) rather than
	* putting it on the list and then processing it in zio_free_sync().
	*/
	if (BP_IS_EMBEDDED(bp))
	return;
	metaslab_check_free(spa, bp);

	/*
	* Frees that are for the currently-syncing txg, are not going to be
	* deferred, and which will not need to do a read (i.e. not GANG or
	* DEDUP), can be processed immediately. Otherwise, put them on the
	* in-memory list for later processing.
	*
	* Note that we only defer frees after zfs_sync_pass_deferred_free
	* when the log space map feature is disabled. [see relevant comment
	* in spa_sync_iterate_to_convergence()]
	*/
	if (BP_IS_GANG(bp) \|\|
	BP_GET_DEDUP(bp) \|\|
	txg != spa->spa_syncing_txg \|\|
	(spa_sync_pass(spa) >= zfs_sync_pass_deferred_free &&
	!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))) {
	bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp);
	} else {
	VERIFY3P(zio_free_sync(NULL, spa, txg, bp, 0), ==, NULL);
	}
	}

	/*
	* To improve performance, this function may return NULL if we were able
	* to do the free immediately. This avoids the cost of creating a zio
	* (and linking it to the parent, etc).
	*/
	zio_t *
	zio_free_sync(zio_t pio, spa_t spa, uint64_t txg, const blkptr_t *bp,
	enum zio_flag flags)
	{
	ASSERT(!BP_IS_HOLE(bp));
	ASSERT(spa_syncing_txg(spa) == txg);

	if (BP_IS_EMBEDDED(bp))
	return (NULL);

	metaslab_check_free(spa, bp);
	arc_freed(spa, bp);
	dsl_scan_freed(spa, bp);

	if (BP_IS_GANG(bp) \|\| BP_GET_DEDUP(bp)) {
	/*
	* GANG and DEDUP blocks can induce a read (for the gang block
	* header, or the DDT), so issue them asynchronously so that
	* this thread is not tied up.
	*/
	enum zio_stage stage =
	ZIO_FREE_PIPELINE \| ZIO_STAGE_ISSUE_ASYNC;

	return (zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp),
	BP_GET_PSIZE(bp), NULL, NULL,
	ZIO_TYPE_FREE, ZIO_PRIORITY_NOW,
	flags, NULL, 0, NULL, ZIO_STAGE_OPEN, stage));
	} else {
	metaslab_free(spa, bp, txg, B_FALSE);
	return (NULL);
	}
	}

	zio_t *
	zio_claim(zio_t pio, spa_t spa, uint64_t txg, const blkptr_t *bp,
	zio_done_func_t done, void private, enum zio_flag flags)
	{
	zio_t *zio;

	(void) zfs_blkptr_verify(spa, bp, flags & ZIO_FLAG_CONFIG_WRITER,
	BLK_VERIFY_HALT);

	if (BP_IS_EMBEDDED(bp))
	return (zio_null(pio, spa, NULL, NULL, NULL, 0));

	/*
	* A claim is an allocation of a specific block. Claims are needed
	* to support immediate writes in the intent log. The issue is that
	* immediate writes contain committed data, but in a txg that was
	* not committed. Upon opening the pool after an unclean shutdown,
	* the intent log claims all blocks that contain immediate write data
	* so that the SPA knows they're in use.
	*
	* All claims must be resolved in the first txg -- before the SPA
	* starts allocating blocks -- so that nothing is allocated twice.
	* If txg == 0 we just verify that the block is claimable.
	*/
	ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <,
	spa_min_claim_txg(spa));
	ASSERT(txg == spa_min_claim_txg(spa) \|\| txg == 0);
	ASSERT(!BP_GET_DEDUP(bp) \|\| !spa_writeable(spa)); /* zdb(8) */

	zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp),
	BP_GET_PSIZE(bp), done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW,
	flags, NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE);
	ASSERT0(zio->io_queued_timestamp);

	return (zio);
	}

	zio_t *
	zio_ioctl(zio_t pio, spa_t spa, vdev_t *vd, int cmd,
	zio_done_func_t done, void private, enum zio_flag flags)
	{
	zio_t *zio;
	int c;

	if (vd->vdev_children == 0) {
	zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private,
	ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL,
	ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE);

	zio->io_cmd = cmd;
	} else {
	zio = zio_null(pio, spa, NULL, NULL, NULL, flags);

	for (c = 0; c < vd->vdev_children; c++)
	zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd,
	done, private, flags));
	}

	return (zio);
	}

	zio_t *
	zio_trim(zio_t pio, vdev_t vd, uint64_t offset, uint64_t size,
	zio_done_func_t done, void private, zio_priority_t priority,
	enum zio_flag flags, enum trim_flag trim_flags)
	{
	zio_t *zio;

	ASSERT0(vd->vdev_children);
	ASSERT0(P2PHASE(offset, 1ULL << vd->vdev_ashift));
	ASSERT0(P2PHASE(size, 1ULL << vd->vdev_ashift));
	ASSERT3U(size, !=, 0);

	zio = zio_create(pio, vd->vdev_spa, 0, NULL, NULL, size, size, done,
	private, ZIO_TYPE_TRIM, priority, flags \| ZIO_FLAG_PHYSICAL,
	vd, offset, NULL, ZIO_STAGE_OPEN, ZIO_TRIM_PIPELINE);
	zio->io_trim_flags = trim_flags;

	return (zio);
	}

	zio_t *
	zio_read_phys(zio_t pio, vdev_t vd, uint64_t offset, uint64_t size,
	abd_t data, int checksum, zio_done_func_t done, void *private,
	zio_priority_t priority, enum zio_flag flags, boolean_t labels)
	{
	zio_t *zio;

	ASSERT(vd->vdev_children == 0);
	ASSERT(!labels \|\| offset + size <= VDEV_LABEL_START_SIZE \|\|
	offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE);
	ASSERT3U(offset + size, <=, vd->vdev_psize);

	zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done,
	private, ZIO_TYPE_READ, priority, flags \| ZIO_FLAG_PHYSICAL, vd,
	offset, NULL, ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE);

	zio->io_prop.zp_checksum = checksum;

	return (zio);
	}

	zio_t *
	zio_write_phys(zio_t pio, vdev_t vd, uint64_t offset, uint64_t size,
	abd_t data, int checksum, zio_done_func_t done, void *private,
	zio_priority_t priority, enum zio_flag flags, boolean_t labels)
	{
	zio_t *zio;

	ASSERT(vd->vdev_children == 0);
	ASSERT(!labels \|\| offset + size <= VDEV_LABEL_START_SIZE \|\|
	offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE);
	ASSERT3U(offset + size, <=, vd->vdev_psize);

	zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done,
	private, ZIO_TYPE_WRITE, priority, flags \| ZIO_FLAG_PHYSICAL, vd,
	offset, NULL, ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE);

	zio->io_prop.zp_checksum = checksum;

	if (zio_checksum_table[checksum].ci_flags & ZCHECKSUM_FLAG_EMBEDDED) {
	/*
	* zec checksums are necessarily destructive -- they modify
	* the end of the write buffer to hold the verifier/checksum.
	* Therefore, we must make a local copy in case the data is
	* being written to multiple places in parallel.
	*/
	abd_t *wbuf = abd_alloc_sametype(data, size);
	abd_copy(wbuf, data, size);

	zio_push_transform(zio, wbuf, size, size, NULL);
	}

	return (zio);
	}

	/*
	* Create a child I/O to do some work for us.
	*/
	zio_t *
	zio_vdev_child_io(zio_t pio, blkptr_t bp, vdev_t *vd, uint64_t offset,
	abd_t *data, uint64_t size, int type, zio_priority_t priority,
	enum zio_flag flags, zio_done_func_t done, void private)
	{
	enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE;
	zio_t *zio;

	/*
	* vdev child I/Os do not propagate their error to the parent.
	* Therefore, for correct operation the caller must check for
	* and handle the error in the child i/o's done callback.
	* The only exceptions are i/os that we don't care about
	* (OPTIONAL or REPAIR).
	*/
	ASSERT((flags & ZIO_FLAG_OPTIONAL) \|\| (flags & ZIO_FLAG_IO_REPAIR) \|\|
	done != NULL);

	if (type == ZIO_TYPE_READ && bp != NULL) {
	/*
	* If we have the bp, then the child should perform the
	* checksum and the parent need not. This pushes error
	* detection as close to the leaves as possible and
	* eliminates redundant checksums in the interior nodes.
	*/
	pipeline \|= ZIO_STAGE_CHECKSUM_VERIFY;
	pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY;
	}

	if (vd->vdev_ops->vdev_op_leaf) {
	ASSERT0(vd->vdev_children);
	offset += VDEV_LABEL_START_SIZE;
	}

	flags \|= ZIO_VDEV_CHILD_FLAGS(pio);

	/*
	* If we've decided to do a repair, the write is not speculative --
	* even if the original read was.
	*/
	if (flags & ZIO_FLAG_IO_REPAIR)
	flags &= ~ZIO_FLAG_SPECULATIVE;

	/*
	* If we're creating a child I/O that is not associated with a
	* top-level vdev, then the child zio is not an allocating I/O.
	* If this is a retried I/O then we ignore it since we will
	* have already processed the original allocating I/O.
	*/
	if (flags & ZIO_FLAG_IO_ALLOCATING &&
	(vd != vd->vdev_top \|\| (flags & ZIO_FLAG_IO_RETRY))) {
	ASSERT(pio->io_metaslab_class != NULL);
	ASSERT(pio->io_metaslab_class->mc_alloc_throttle_enabled);
	ASSERT(type == ZIO_TYPE_WRITE);
	ASSERT(priority == ZIO_PRIORITY_ASYNC_WRITE);
	ASSERT(!(flags & ZIO_FLAG_IO_REPAIR));
	ASSERT(!(pio->io_flags & ZIO_FLAG_IO_REWRITE) \|\|
	pio->io_child_type == ZIO_CHILD_GANG);

	flags &= ~ZIO_FLAG_IO_ALLOCATING;
	}


	zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, size,
	done, private, type, priority, flags, vd, offset, &pio->io_bookmark,
	ZIO_STAGE_VDEV_IO_START >> 1, pipeline);
	ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV);

	zio->io_physdone = pio->io_physdone;
	if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL)
	zio->io_logical->io_phys_children++;

	return (zio);
	}

	zio_t *
	zio_vdev_delegated_io(vdev_t vd, uint64_t offset, abd_t data, uint64_t size,
	zio_type_t type, zio_priority_t priority, enum zio_flag flags,
	zio_done_func_t done, void private)
	{
	zio_t *zio;

	ASSERT(vd->vdev_ops->vdev_op_leaf);

	zio = zio_create(NULL, vd->vdev_spa, 0, NULL,
	data, size, size, done, private, type, priority,
	flags \| ZIO_FLAG_CANFAIL \| ZIO_FLAG_DONT_RETRY \| ZIO_FLAG_DELEGATED,
	vd, offset, NULL,
	ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE);

	return (zio);
	}

	void
	zio_flush(zio_t zio, vdev_t vd)
	{
	zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE,
	NULL, NULL,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_DONT_PROPAGATE \| ZIO_FLAG_DONT_RETRY));
	}

	void
	zio_shrink(zio_t *zio, uint64_t size)
	{
	ASSERT3P(zio->io_executor, ==, NULL);
	ASSERT3U(zio->io_orig_size, ==, zio->io_size);
	ASSERT3U(size, <=, zio->io_size);

	/*
	* We don't shrink for raidz because of problems with the
	* reconstruction when reading back less than the block size.
	* Note, BP_IS_RAIDZ() assumes no compression.
	*/
	ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF);
	if (!BP_IS_RAIDZ(zio->io_bp)) {
	/* we are not doing a raw write */
	ASSERT3U(zio->io_size, ==, zio->io_lsize);
	zio->io_orig_size = zio->io_size = zio->io_lsize = size;
	}
	}

	/*
	* ==========================================================================
	* Prepare to read and write logical blocks
	* ==========================================================================
	*/

	static zio_t *
	zio_read_bp_init(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;
	uint64_t psize =
	BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp);

	ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy);

	if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF &&
	zio->io_child_type == ZIO_CHILD_LOGICAL &&
	!(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) {
	zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize),
	psize, psize, zio_decompress);
	}

	if (((BP_IS_PROTECTED(bp) && !(zio->io_flags & ZIO_FLAG_RAW_ENCRYPT)) \|\|
	BP_HAS_INDIRECT_MAC_CKSUM(bp)) &&
	zio->io_child_type == ZIO_CHILD_LOGICAL) {
	zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize),
	psize, psize, zio_decrypt);
	}

	if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) {
	int psize = BPE_GET_PSIZE(bp);
	void *data = abd_borrow_buf(zio->io_abd, psize);

	zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
	decode_embedded_bp_compressed(bp, data);
	abd_return_buf_copy(zio->io_abd, data, psize);
	} else {
	ASSERT(!BP_IS_EMBEDDED(bp));
	ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy);
	}

	if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0)
	zio->io_flags \|= ZIO_FLAG_DONT_CACHE;

	if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP)
	zio->io_flags \|= ZIO_FLAG_DONT_CACHE;

	if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL)
	zio->io_pipeline = ZIO_DDT_READ_PIPELINE;

	return (zio);
	}

	static zio_t *
	zio_write_bp_init(zio_t *zio)
	{
	if (!IO_IS_ALLOCATING(zio))
	return (zio);

	ASSERT(zio->io_child_type != ZIO_CHILD_DDT);

	if (zio->io_bp_override) {
	blkptr_t *bp = zio->io_bp;
	zio_prop_t *zp = &zio->io_prop;

	ASSERT(bp->blk_birth != zio->io_txg);
	ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0);

	bp = zio->io_bp_override;
	zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;

	if (BP_IS_EMBEDDED(bp))
	return (zio);

	/*
	* If we've been overridden and nopwrite is set then
	* set the flag accordingly to indicate that a nopwrite
	* has already occurred.
	*/
	if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) {
	ASSERT(!zp->zp_dedup);
	ASSERT3U(BP_GET_CHECKSUM(bp), ==, zp->zp_checksum);
	zio->io_flags \|= ZIO_FLAG_NOPWRITE;
	return (zio);
	}

	ASSERT(!zp->zp_nopwrite);

	if (BP_IS_HOLE(bp) \|\| !zp->zp_dedup)
	return (zio);

	ASSERT((zio_checksum_table[zp->zp_checksum].ci_flags &
	ZCHECKSUM_FLAG_DEDUP) \|\| zp->zp_dedup_verify);

	if (BP_GET_CHECKSUM(bp) == zp->zp_checksum &&
	!zp->zp_encrypt) {
	BP_SET_DEDUP(bp, 1);
	zio->io_pipeline \|= ZIO_STAGE_DDT_WRITE;
	return (zio);
	}

	/*
	* We were unable to handle this as an override bp, treat
	* it as a regular write I/O.
	*/
	zio->io_bp_override = NULL;
	*bp = zio->io_bp_orig;
	zio->io_pipeline = zio->io_orig_pipeline;
	}

	return (zio);
	}

	static zio_t *
	zio_write_compress(zio_t *zio)
	{
	spa_t *spa = zio->io_spa;
	zio_prop_t *zp = &zio->io_prop;
	enum zio_compress compress = zp->zp_compress;
	blkptr_t *bp = zio->io_bp;
	uint64_t lsize = zio->io_lsize;
	uint64_t psize = zio->io_size;
	int pass = 1;

	/*
	* If our children haven't all reached the ready stage,
	* wait for them and then repeat this pipeline stage.
	*/
	if (zio_wait_for_children(zio, ZIO_CHILD_LOGICAL_BIT \|
	ZIO_CHILD_GANG_BIT, ZIO_WAIT_READY)) {
	return (NULL);
	}

	if (!IO_IS_ALLOCATING(zio))
	return (zio);

	if (zio->io_children_ready != NULL) {
	/*
	* Now that all our children are ready, run the callback
	* associated with this zio in case it wants to modify the
	* data to be written.
	*/
	ASSERT3U(zp->zp_level, >, 0);
	zio->io_children_ready(zio);
	}

	ASSERT(zio->io_child_type != ZIO_CHILD_DDT);
	ASSERT(zio->io_bp_override == NULL);

	if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) {
	/*
	* We're rewriting an existing block, which means we're
	* working on behalf of spa_sync(). For spa_sync() to
	* converge, it must eventually be the case that we don't
	* have to allocate new blocks. But compression changes
	* the blocksize, which forces a reallocate, and makes
	* convergence take longer. Therefore, after the first
	* few passes, stop compressing to ensure convergence.
	*/
	pass = spa_sync_pass(spa);

	ASSERT(zio->io_txg == spa_syncing_txg(spa));
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
	ASSERT(!BP_GET_DEDUP(bp));

	if (pass >= zfs_sync_pass_dont_compress)
	compress = ZIO_COMPRESS_OFF;

	/* Make sure someone doesn't change their mind on overwrites */
	ASSERT(BP_IS_EMBEDDED(bp) \|\| MIN(zp->zp_copies + BP_IS_GANG(bp),
	spa_max_replication(spa)) == BP_GET_NDVAS(bp));
	}

	/* If it's a compressed write that is not raw, compress the buffer. */
	if (compress != ZIO_COMPRESS_OFF &&
	!(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) {
	void *cbuf = zio_buf_alloc(lsize);
	psize = zio_compress_data(compress, zio->io_abd, cbuf, lsize,
	zp->zp_complevel);
	if (psize == 0 \|\| psize >= lsize) {
	compress = ZIO_COMPRESS_OFF;
	zio_buf_free(cbuf, lsize);
	} else if (!zp->zp_dedup && !zp->zp_encrypt &&
	psize <= BPE_PAYLOAD_SIZE &&
	zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) &&
	spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) {
	encode_embedded_bp_compressed(bp,
	cbuf, compress, lsize, psize);
	BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA);
	BP_SET_TYPE(bp, zio->io_prop.zp_type);
	BP_SET_LEVEL(bp, zio->io_prop.zp_level);
	zio_buf_free(cbuf, lsize);
	bp->blk_birth = zio->io_txg;
	zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
	ASSERT(spa_feature_is_active(spa,
	SPA_FEATURE_EMBEDDED_DATA));
	return (zio);
	} else {
	/*
	* Round compressed size up to the minimum allocation
	* size of the smallest-ashift device, and zero the
	* tail. This ensures that the compressed size of the
	* BP (and thus compressratio property) are correct,
	* in that we charge for the padding used to fill out
	* the last sector.
	*/
	ASSERT3U(spa->spa_min_alloc, >=, SPA_MINBLOCKSHIFT);
	size_t rounded = (size_t)roundup(psize,
	spa->spa_min_alloc);
	if (rounded >= lsize) {
	compress = ZIO_COMPRESS_OFF;
	zio_buf_free(cbuf, lsize);
	psize = lsize;
	} else {
	abd_t *cdata = abd_get_from_buf(cbuf, lsize);
	abd_take_ownership_of_buf(cdata, B_TRUE);
	abd_zero_off(cdata, psize, rounded - psize);
	psize = rounded;
	zio_push_transform(zio, cdata,
	psize, lsize, NULL);
	}
	}

	/*
	* We were unable to handle this as an override bp, treat
	* it as a regular write I/O.
	*/
	zio->io_bp_override = NULL;
	*bp = zio->io_bp_orig;
	zio->io_pipeline = zio->io_orig_pipeline;

	} else if ((zio->io_flags & ZIO_FLAG_RAW_ENCRYPT) != 0 &&
	zp->zp_type == DMU_OT_DNODE) {
	/*
	* The DMU actually relies on the zio layer's compression
	* to free metadnode blocks that have had all contained
	* dnodes freed. As a result, even when doing a raw
	* receive, we must check whether the block can be compressed
	* to a hole.
	*/
	psize = zio_compress_data(ZIO_COMPRESS_EMPTY,
	zio->io_abd, NULL, lsize, zp->zp_complevel);
	if (psize == 0 \|\| psize >= lsize)
	compress = ZIO_COMPRESS_OFF;
	+ } else if (zio->io_flags & ZIO_FLAG_RAW_COMPRESS) {
	+ size_t rounded = MIN((size_t)roundup(psize,
	+ spa->spa_min_alloc), lsize);
	+
	+ if (rounded != psize) {
	+ abd_t *cdata = abd_alloc_linear(rounded, B_TRUE);
	+ abd_zero_off(cdata, psize, rounded - psize);
	+ abd_copy_off(cdata, zio->io_abd, 0, 0, psize);
	+ psize = rounded;
	+ zio_push_transform(zio, cdata,
	+ psize, rounded, NULL);
	+ }
	} else {
	ASSERT3U(psize, !=, 0);
	}

	/*
	* The final pass of spa_sync() must be all rewrites, but the first
	* few passes offer a trade-off: allocating blocks defers convergence,
	* but newly allocated blocks are sequential, so they can be written
	* to disk faster. Therefore, we allow the first few passes of
	* spa_sync() to allocate new blocks, but force rewrites after that.
	* There should only be a handful of blocks after pass 1 in any case.
	*/
	if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg &&
	BP_GET_PSIZE(bp) == psize &&
	pass >= zfs_sync_pass_rewrite) {
	VERIFY3U(psize, !=, 0);
	enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES;

	zio->io_pipeline = ZIO_REWRITE_PIPELINE \| gang_stages;
	zio->io_flags \|= ZIO_FLAG_IO_REWRITE;
	} else {
	BP_ZERO(bp);
	zio->io_pipeline = ZIO_WRITE_PIPELINE;
	}

	if (psize == 0) {
	if (zio->io_bp_orig.blk_birth != 0 &&
	spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
	BP_SET_LSIZE(bp, lsize);
	BP_SET_TYPE(bp, zp->zp_type);
	BP_SET_LEVEL(bp, zp->zp_level);
	BP_SET_BIRTH(bp, zio->io_txg, 0);
	}
	zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
	} else {
	ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER);
	BP_SET_LSIZE(bp, lsize);
	BP_SET_TYPE(bp, zp->zp_type);
	BP_SET_LEVEL(bp, zp->zp_level);
	BP_SET_PSIZE(bp, psize);
	BP_SET_COMPRESS(bp, compress);
	BP_SET_CHECKSUM(bp, zp->zp_checksum);
	BP_SET_DEDUP(bp, zp->zp_dedup);
	BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);
	if (zp->zp_dedup) {
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
	ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE));
	ASSERT(!zp->zp_encrypt \|\|
	DMU_OT_IS_ENCRYPTED(zp->zp_type));
	zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE;
	}
	if (zp->zp_nopwrite) {
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
	ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE));
	zio->io_pipeline \|= ZIO_STAGE_NOP_WRITE;
	}
	}
	return (zio);
	}

	static zio_t *
	zio_free_bp_init(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;

	if (zio->io_child_type == ZIO_CHILD_LOGICAL) {
	if (BP_GET_DEDUP(bp))
	zio->io_pipeline = ZIO_DDT_FREE_PIPELINE;
	}

	ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy);

	return (zio);
	}

	/*
	* ==========================================================================
	* Execute the I/O pipeline
	* ==========================================================================
	*/

	static void
	zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline)
	{
	spa_t *spa = zio->io_spa;
	zio_type_t t = zio->io_type;
	int flags = (cutinline ? TQ_FRONT : 0);

	/*
	* If we're a config writer or a probe, the normal issue and
	* interrupt threads may all be blocked waiting for the config lock.
	* In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL.
	*/
	if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER \| ZIO_FLAG_PROBE))
	t = ZIO_TYPE_NULL;

	/*
	* A similar issue exists for the L2ARC write thread until L2ARC 2.0.
	*/
	if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux)
	t = ZIO_TYPE_NULL;

	/*
	* If this is a high priority I/O, then use the high priority taskq if
	* available.
	*/
	if ((zio->io_priority == ZIO_PRIORITY_NOW \|\|
	zio->io_priority == ZIO_PRIORITY_SYNC_WRITE) &&
	spa->spa_zio_taskq[t][q + 1].stqs_count != 0)
	q++;

	ASSERT3U(q, <, ZIO_TASKQ_TYPES);

	/*
	* NB: We are assuming that the zio can only be dispatched
	* to a single taskq at a time. It would be a grievous error
	* to dispatch the zio to another taskq at the same time.
	*/
	ASSERT(taskq_empty_ent(&zio->io_tqent));
	- spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio,
	- flags, &zio->io_tqent);
	+ spa_taskq_dispatch_ent(spa, t, q, zio_execute, zio, flags,
	+ &zio->io_tqent);
	}

	static boolean_t
	zio_taskq_member(zio_t *zio, zio_taskq_type_t q)
	{
	spa_t *spa = zio->io_spa;

	taskq_t *tq = taskq_of_curthread();

	for (zio_type_t t = 0; t < ZIO_TYPES; t++) {
	spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q];
	uint_t i;
	for (i = 0; i < tqs->stqs_count; i++) {
	if (tqs->stqs_taskq[i] == tq)
	return (B_TRUE);
	}
	}

	return (B_FALSE);
	}

	static zio_t *
	zio_issue_async(zio_t *zio)
	{
	zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE);

	return (NULL);
	}

	void
	-zio_interrupt(zio_t *zio)
	+zio_interrupt(void *zio)
	{
	zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE);
	}

	void
	zio_delay_interrupt(zio_t *zio)
	{
	/*
	* The timeout_generic() function isn't defined in userspace, so
	* rather than trying to implement the function, the zio delay
	* functionality has been disabled for userspace builds.
	*/

	#ifdef _KERNEL
	/*
	* If io_target_timestamp is zero, then no delay has been registered
	* for this IO, thus jump to the end of this function and "skip" the
	* delay; issuing it directly to the zio layer.
	*/
	if (zio->io_target_timestamp != 0) {
	hrtime_t now = gethrtime();

	if (now >= zio->io_target_timestamp) {
	/*
	* This IO has already taken longer than the target
	* delay to complete, so we don't want to delay it
	* any longer; we "miss" the delay and issue it
	* directly to the zio layer. This is likely due to
	* the target latency being set to a value less than
	* the underlying hardware can satisfy (e.g. delay
	* set to 1ms, but the disks take 10ms to complete an
	* IO request).
	*/

	DTRACE_PROBE2(zio__delay__miss, zio_t *, zio,
	hrtime_t, now);

	zio_interrupt(zio);
	} else {
	taskqid_t tid;
	hrtime_t diff = zio->io_target_timestamp - now;
	clock_t expire_at_tick = ddi_get_lbolt() +
	NSEC_TO_TICK(diff);

	DTRACE_PROBE3(zio__delay__hit, zio_t *, zio,
	hrtime_t, now, hrtime_t, diff);

	if (NSEC_TO_TICK(diff) == 0) {
	/* Our delay is less than a jiffy - just spin */
	zfs_sleep_until(zio->io_target_timestamp);
	zio_interrupt(zio);
	} else {
	/*
	* Use taskq_dispatch_delay() in the place of
	* OpenZFS's timeout_generic().
	*/
	tid = taskq_dispatch_delay(system_taskq,
	- (task_func_t *)zio_interrupt,
	- zio, TQ_NOSLEEP, expire_at_tick);
	+ zio_interrupt, zio, TQ_NOSLEEP,
	+ expire_at_tick);
	if (tid == TASKQID_INVALID) {
	/*
	* Couldn't allocate a task. Just
	* finish the zio without a delay.
	*/
	zio_interrupt(zio);
	}
	}
	}
	return;
	}
	#endif
	DTRACE_PROBE1(zio__delay__skip, zio_t *, zio);
	zio_interrupt(zio);
	}

	static void
	zio_deadman_impl(zio_t *pio, int ziodepth)
	{
	zio_t cio, cio_next;
	zio_link_t *zl = NULL;
	vdev_t *vd = pio->io_vd;

	if (zio_deadman_log_all \|\| (vd != NULL && vd->vdev_ops->vdev_op_leaf)) {
	vdev_queue_t *vq = vd ? &vd->vdev_queue : NULL;
	zbookmark_phys_t *zb = &pio->io_bookmark;
	uint64_t delta = gethrtime() - pio->io_timestamp;
	uint64_t failmode = spa_get_deadman_failmode(pio->io_spa);

	zfs_dbgmsg("slow zio[%d]: zio=%px timestamp=%llu "
	"delta=%llu queued=%llu io=%llu "
	"path=%s "
	"last=%llu type=%d "
	"priority=%d flags=0x%x stage=0x%x "
	"pipeline=0x%x pipeline-trace=0x%x "
	"objset=%llu object=%llu "
	"level=%llu blkid=%llu "
	"offset=%llu size=%llu "
	"error=%d",
	ziodepth, pio, pio->io_timestamp,
	(u_longlong_t)delta, pio->io_delta, pio->io_delay,
	vd ? vd->vdev_path : "NULL",
	vq ? vq->vq_io_complete_ts : 0, pio->io_type,
	pio->io_priority, pio->io_flags, pio->io_stage,
	pio->io_pipeline, pio->io_pipeline_trace,
	(u_longlong_t)zb->zb_objset, (u_longlong_t)zb->zb_object,
	(u_longlong_t)zb->zb_level, (u_longlong_t)zb->zb_blkid,
	(u_longlong_t)pio->io_offset, (u_longlong_t)pio->io_size,
	pio->io_error);
	(void) zfs_ereport_post(FM_EREPORT_ZFS_DEADMAN,
	pio->io_spa, vd, zb, pio, 0);

	if (failmode == ZIO_FAILURE_MODE_CONTINUE &&
	taskq_empty_ent(&pio->io_tqent)) {
	zio_interrupt(pio);
	}
	}

	mutex_enter(&pio->io_lock);
	for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) {
	cio_next = zio_walk_children(pio, &zl);
	zio_deadman_impl(cio, ziodepth + 1);
	}
	mutex_exit(&pio->io_lock);
	}

	/*
	* Log the critical information describing this zio and all of its children
	* using the zfs_dbgmsg() interface then post deadman event for the ZED.
	*/
	void
	zio_deadman(zio_t pio, char tag)
	{
	spa_t *spa = pio->io_spa;
	char *name = spa_name(spa);

	if (!zfs_deadman_enabled \|\| spa_suspended(spa))
	return;

	zio_deadman_impl(pio, 0);

	switch (spa_get_deadman_failmode(spa)) {
	case ZIO_FAILURE_MODE_WAIT:
	zfs_dbgmsg("%s waiting for hung I/O to pool '%s'", tag, name);
	break;

	case ZIO_FAILURE_MODE_CONTINUE:
	zfs_dbgmsg("%s restarting hung I/O for pool '%s'", tag, name);
	break;

	case ZIO_FAILURE_MODE_PANIC:
	fm_panic("%s determined I/O to pool '%s' is hung.", tag, name);
	break;
	}
	}

	/*
	* Execute the I/O pipeline until one of the following occurs:
	* (1) the I/O completes; (2) the pipeline stalls waiting for
	* dependent child I/Os; (3) the I/O issues, so we're waiting
	* for an I/O completion interrupt; (4) the I/O is delegated by
	* vdev-level caching or aggregation; (5) the I/O is deferred
	* due to vdev-level queueing; (6) the I/O is handed off to
	* another thread. In all cases, the pipeline stops whenever
	* there's no CPU work; it never burns a thread in cv_wait_io().
	*
	* There's no locking on io_stage because there's no legitimate way
	* for multiple threads to be attempting to process the same I/O.
	*/
	static zio_pipe_stage_t *zio_pipeline[];

	/*
	* zio_execute() is a wrapper around the static function
	* __zio_execute() so that we can force __zio_execute() to be
	* inlined. This reduces stack overhead which is important
	* because __zio_execute() is called recursively in several zio
	* code paths. zio_execute() itself cannot be inlined because
	* it is externally visible.
	*/
	void
	-zio_execute(zio_t *zio)
	+zio_execute(void *zio)
	{
	fstrans_cookie_t cookie;

	cookie = spl_fstrans_mark();
	__zio_execute(zio);
	spl_fstrans_unmark(cookie);
	}

	/*
	* Used to determine if in the current context the stack is sized large
	* enough to allow zio_execute() to be called recursively. A minimum
	* stack size of 16K is required to avoid needing to re-dispatch the zio.
	*/
	static boolean_t
	zio_execute_stack_check(zio_t *zio)
	{
	#if !defined(HAVE_LARGE_STACKS)
	dsl_pool_t *dp = spa_get_dsl(zio->io_spa);

	/* Executing in txg_sync_thread() context. */
	if (dp && curthread == dp->dp_tx.tx_sync_thread)
	return (B_TRUE);

	/* Pool initialization outside of zio_taskq context. */
	if (dp && spa_is_initializing(dp->dp_spa) &&
	!zio_taskq_member(zio, ZIO_TASKQ_ISSUE) &&
	!zio_taskq_member(zio, ZIO_TASKQ_ISSUE_HIGH))
	return (B_TRUE);
	#endif /* HAVE_LARGE_STACKS */

	return (B_FALSE);
	}

	__attribute__((always_inline))
	static inline void
	__zio_execute(zio_t *zio)
	{
	ASSERT3U(zio->io_queued_timestamp, >, 0);

	while (zio->io_stage < ZIO_STAGE_DONE) {
	enum zio_stage pipeline = zio->io_pipeline;
	enum zio_stage stage = zio->io_stage;

	zio->io_executor = curthread;

	ASSERT(!MUTEX_HELD(&zio->io_lock));
	ASSERT(ISP2(stage));
	ASSERT(zio->io_stall == NULL);

	do {
	stage <<= 1;
	} while ((stage & pipeline) == 0);

	ASSERT(stage <= ZIO_STAGE_DONE);

	/*
	* If we are in interrupt context and this pipeline stage
	* will grab a config lock that is held across I/O,
	* or may wait for an I/O that needs an interrupt thread
	* to complete, issue async to avoid deadlock.
	*
	* For VDEV_IO_START, we cut in line so that the io will
	* be sent to disk promptly.
	*/
	if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL &&
	zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) {
	boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ?
	zio_requeue_io_start_cut_in_line : B_FALSE;
	zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut);
	return;
	}

	/*
	* If the current context doesn't have large enough stacks
	* the zio must be issued asynchronously to prevent overflow.
	*/
	if (zio_execute_stack_check(zio)) {
	boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ?
	zio_requeue_io_start_cut_in_line : B_FALSE;
	zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut);
	return;
	}

	zio->io_stage = stage;
	zio->io_pipeline_trace \|= zio->io_stage;

	/*
	* The zio pipeline stage returns the next zio to execute
	* (typically the same as this one), or NULL if we should
	* stop.
	*/
	zio = zio_pipeline[highbit64(stage) - 1](zio);

	if (zio == NULL)
	return;
	}
	}


	/*
	* ==========================================================================
	* Initiate I/O, either sync or async
	* ==========================================================================
	*/
	int
	zio_wait(zio_t *zio)
	{
	/*
	* Some routines, like zio_free_sync(), may return a NULL zio
	* to avoid the performance overhead of creating and then destroying
	* an unneeded zio. For the callers' simplicity, we accept a NULL
	* zio and ignore it.
	*/
	if (zio == NULL)
	return (0);

	long timeout = MSEC_TO_TICK(zfs_deadman_ziotime_ms);
	int error;

	ASSERT3S(zio->io_stage, ==, ZIO_STAGE_OPEN);
	ASSERT3P(zio->io_executor, ==, NULL);

	zio->io_waiter = curthread;
	ASSERT0(zio->io_queued_timestamp);
	zio->io_queued_timestamp = gethrtime();

	__zio_execute(zio);

	mutex_enter(&zio->io_lock);
	while (zio->io_executor != NULL) {
	error = cv_timedwait_io(&zio->io_cv, &zio->io_lock,
	ddi_get_lbolt() + timeout);

	if (zfs_deadman_enabled && error == -1 &&
	gethrtime() - zio->io_queued_timestamp >
	spa_deadman_ziotime(zio->io_spa)) {
	mutex_exit(&zio->io_lock);
	timeout = MSEC_TO_TICK(zfs_deadman_checktime_ms);
	zio_deadman(zio, FTAG);
	mutex_enter(&zio->io_lock);
	}
	}
	mutex_exit(&zio->io_lock);

	error = zio->io_error;
	zio_destroy(zio);

	return (error);
	}

	void
	zio_nowait(zio_t *zio)
	{
	/*
	* See comment in zio_wait().
	*/
	if (zio == NULL)
	return;

	ASSERT3P(zio->io_executor, ==, NULL);

	if (zio->io_child_type == ZIO_CHILD_LOGICAL &&
	zio_unique_parent(zio) == NULL) {
	zio_t *pio;

	/*
	* This is a logical async I/O with no parent to wait for it.
	* We add it to the spa_async_root_zio "Godfather" I/O which
	* will ensure they complete prior to unloading the pool.
	*/
	spa_t *spa = zio->io_spa;
	pio = spa->spa_async_zio_root[CPU_SEQID_UNSTABLE];

	zio_add_child(pio, zio);
	}

	ASSERT0(zio->io_queued_timestamp);
	zio->io_queued_timestamp = gethrtime();
	__zio_execute(zio);
	}

	/*
	* ==========================================================================
	* Reexecute, cancel, or suspend/resume failed I/O
	* ==========================================================================
	*/

	static void
	-zio_reexecute(zio_t *pio)
	+zio_reexecute(void *arg)
	{
	+ zio_t *pio = arg;
	zio_t cio, cio_next;

	ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL);
	ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN);
	ASSERT(pio->io_gang_leader == NULL);
	ASSERT(pio->io_gang_tree == NULL);

	pio->io_flags = pio->io_orig_flags;
	pio->io_stage = pio->io_orig_stage;
	pio->io_pipeline = pio->io_orig_pipeline;
	pio->io_reexecute = 0;
	pio->io_flags \|= ZIO_FLAG_REEXECUTED;
	pio->io_pipeline_trace = 0;
	pio->io_error = 0;
	for (int w = 0; w < ZIO_WAIT_TYPES; w++)
	pio->io_state[w] = 0;
	for (int c = 0; c < ZIO_CHILD_TYPES; c++)
	pio->io_child_error[c] = 0;

	if (IO_IS_ALLOCATING(pio))
	BP_ZERO(pio->io_bp);

	/*
	* As we reexecute pio's children, new children could be created.
	* New children go to the head of pio's io_child_list, however,
	* so we will (correctly) not reexecute them. The key is that
	* the remainder of pio's io_child_list, from 'cio_next' onward,
	* cannot be affected by any side effects of reexecuting 'cio'.
	*/
	zio_link_t *zl = NULL;
	mutex_enter(&pio->io_lock);
	for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) {
	cio_next = zio_walk_children(pio, &zl);
	for (int w = 0; w < ZIO_WAIT_TYPES; w++)
	pio->io_children[cio->io_child_type][w]++;
	mutex_exit(&pio->io_lock);
	zio_reexecute(cio);
	mutex_enter(&pio->io_lock);
	}
	mutex_exit(&pio->io_lock);

	/*
	* Now that all children have been reexecuted, execute the parent.
	* We don't reexecute "The Godfather" I/O here as it's the
	* responsibility of the caller to wait on it.
	*/
	if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) {
	pio->io_queued_timestamp = gethrtime();
	__zio_execute(pio);
	}
	}

	void
	zio_suspend(spa_t spa, zio_t zio, zio_suspend_reason_t reason)
	{
	if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC)
	fm_panic("Pool '%s' has encountered an uncorrectable I/O "
	"failure and the failure mode property for this pool "
	"is set to panic.", spa_name(spa));

	cmn_err(CE_WARN, "Pool '%s' has encountered an uncorrectable I/O "
	"failure and has been suspended.\n", spa_name(spa));

	(void) zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL,
	NULL, NULL, 0);

	mutex_enter(&spa->spa_suspend_lock);

	if (spa->spa_suspend_zio_root == NULL)
	spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE \|
	ZIO_FLAG_GODFATHER);

	spa->spa_suspended = reason;

	if (zio != NULL) {
	ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER));
	ASSERT(zio != spa->spa_suspend_zio_root);
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
	ASSERT(zio_unique_parent(zio) == NULL);
	ASSERT(zio->io_stage == ZIO_STAGE_DONE);
	zio_add_child(spa->spa_suspend_zio_root, zio);
	}

	mutex_exit(&spa->spa_suspend_lock);
	}

	int
	zio_resume(spa_t *spa)
	{
	zio_t *pio;

	/*
	* Reexecute all previously suspended i/o.
	*/
	mutex_enter(&spa->spa_suspend_lock);
	spa->spa_suspended = ZIO_SUSPEND_NONE;
	cv_broadcast(&spa->spa_suspend_cv);
	pio = spa->spa_suspend_zio_root;
	spa->spa_suspend_zio_root = NULL;
	mutex_exit(&spa->spa_suspend_lock);

	if (pio == NULL)
	return (0);

	zio_reexecute(pio);
	return (zio_wait(pio));
	}

	void
	zio_resume_wait(spa_t *spa)
	{
	mutex_enter(&spa->spa_suspend_lock);
	while (spa_suspended(spa))
	cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock);
	mutex_exit(&spa->spa_suspend_lock);
	}

	/*
	* ==========================================================================
	* Gang blocks.
	*
	* A gang block is a collection of small blocks that looks to the DMU
	* like one large block. When zio_dva_allocate() cannot find a block
	* of the requested size, due to either severe fragmentation or the pool
	* being nearly full, it calls zio_write_gang_block() to construct the
	* block from smaller fragments.
	*
	* A gang block consists of a gang header (zio_gbh_phys_t) and up to
	* three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like
	* an indirect block: it's an array of block pointers. It consumes
	* only one sector and hence is allocatable regardless of fragmentation.
	* The gang header's bps point to its gang members, which hold the data.
	*
	* Gang blocks are self-checksumming, using the bp's <vdev, offset, txg>
	* as the verifier to ensure uniqueness of the SHA256 checksum.
	* Critically, the gang block bp's blk_cksum is the checksum of the data,
	* not the gang header. This ensures that data block signatures (needed for
	* deduplication) are independent of how the block is physically stored.
	*
	* Gang blocks can be nested: a gang member may itself be a gang block.
	* Thus every gang block is a tree in which root and all interior nodes are
	* gang headers, and the leaves are normal blocks that contain user data.
	* The root of the gang tree is called the gang leader.
	*
	* To perform any operation (read, rewrite, free, claim) on a gang block,
	* zio_gang_assemble() first assembles the gang tree (minus data leaves)
	* in the io_gang_tree field of the original logical i/o by recursively
	* reading the gang leader and all gang headers below it. This yields
	* an in-core tree containing the contents of every gang header and the
	* bps for every constituent of the gang block.
	*
	* With the gang tree now assembled, zio_gang_issue() just walks the gang tree
	* and invokes a callback on each bp. To free a gang block, zio_gang_issue()
	* calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp.
	* zio_claim_gang() provides a similarly trivial wrapper for zio_claim().
	* zio_read_gang() is a wrapper around zio_read() that omits reading gang
	* headers, since we already have those in io_gang_tree. zio_rewrite_gang()
	* performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite()
	* of the gang header plus zio_checksum_compute() of the data to update the
	* gang header's blk_cksum as described above.
	*
	* The two-phase assemble/issue model solves the problem of partial failure --
	* what if you'd freed part of a gang block but then couldn't read the
	* gang header for another part? Assembling the entire gang tree first
	* ensures that all the necessary gang header I/O has succeeded before
	* starting the actual work of free, claim, or write. Once the gang tree
	* is assembled, free and claim are in-memory operations that cannot fail.
	*
	* In the event that a gang write fails, zio_dva_unallocate() walks the
	* gang tree to immediately free (i.e. insert back into the space map)
	* everything we've allocated. This ensures that we don't get ENOSPC
	* errors during repeated suspend/resume cycles due to a flaky device.
	*
	* Gang rewrites only happen during sync-to-convergence. If we can't assemble
	* the gang tree, we won't modify the block, so we can safely defer the free
	* (knowing that the block is still intact). If we can assemble the gang
	* tree, then even if some of the rewrites fail, zio_dva_unallocate() will free
	* each constituent bp and we can allocate a new block on the next sync pass.
	*
	* In all cases, the gang tree allows complete recovery from partial failure.
	* ==========================================================================
	*/

	static void
	zio_gang_issue_func_done(zio_t *zio)
	{
	abd_free(zio->io_abd);
	}

	static zio_t *
	zio_read_gang(zio_t pio, blkptr_t bp, zio_gang_node_t gn, abd_t data,
	uint64_t offset)
	{
	if (gn != NULL)
	return (pio);

	return (zio_read(pio, pio->io_spa, bp, abd_get_offset(data, offset),
	BP_GET_PSIZE(bp), zio_gang_issue_func_done,
	NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio),
	&pio->io_bookmark));
	}

	static zio_t *
	zio_rewrite_gang(zio_t pio, blkptr_t bp, zio_gang_node_t gn, abd_t data,
	uint64_t offset)
	{
	zio_t *zio;

	if (gn != NULL) {
	abd_t *gbh_abd =
	abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE);
	zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp,
	gbh_abd, SPA_GANGBLOCKSIZE, zio_gang_issue_func_done, NULL,
	pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio),
	&pio->io_bookmark);
	/*
	* As we rewrite each gang header, the pipeline will compute
	* a new gang block header checksum for it; but no one will
	* compute a new data checksum, so we do that here. The one
	* exception is the gang leader: the pipeline already computed
	* its data checksum because that stage precedes gang assembly.
	* (Presently, nothing actually uses interior data checksums;
	* this is just good hygiene.)
	*/
	if (gn != pio->io_gang_leader->io_gang_tree) {
	abd_t *buf = abd_get_offset(data, offset);

	zio_checksum_compute(zio, BP_GET_CHECKSUM(bp),
	buf, BP_GET_PSIZE(bp));

	abd_free(buf);
	}
	/*
	* If we are here to damage data for testing purposes,
	* leave the GBH alone so that we can detect the damage.
	*/
	if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE)
	zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES;
	} else {
	zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp,
	abd_get_offset(data, offset), BP_GET_PSIZE(bp),
	zio_gang_issue_func_done, NULL, pio->io_priority,
	ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark);
	}

	return (zio);
	}

	/* ARGSUSED */
	static zio_t *
	zio_free_gang(zio_t pio, blkptr_t bp, zio_gang_node_t gn, abd_t data,
	uint64_t offset)
	{
	zio_t *zio = zio_free_sync(pio, pio->io_spa, pio->io_txg, bp,
	ZIO_GANG_CHILD_FLAGS(pio));
	if (zio == NULL) {
	zio = zio_null(pio, pio->io_spa,
	NULL, NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio));
	}
	return (zio);
	}

	/* ARGSUSED */
	static zio_t *
	zio_claim_gang(zio_t pio, blkptr_t bp, zio_gang_node_t gn, abd_t data,
	uint64_t offset)
	{
	return (zio_claim(pio, pio->io_spa, pio->io_txg, bp,
	NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio)));
	}

	static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = {
	NULL,
	zio_read_gang,
	zio_rewrite_gang,
	zio_free_gang,
	zio_claim_gang,
	NULL
	};

	static void zio_gang_tree_assemble_done(zio_t *zio);

	static zio_gang_node_t *
	zio_gang_node_alloc(zio_gang_node_t **gnpp)
	{
	zio_gang_node_t *gn;

	ASSERT(*gnpp == NULL);

	gn = kmem_zalloc(sizeof (*gn), KM_SLEEP);
	gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE);
	*gnpp = gn;

	return (gn);
	}

	static void
	zio_gang_node_free(zio_gang_node_t **gnpp)
	{
	zio_gang_node_t gn = gnpp;

	for (int g = 0; g < SPA_GBH_NBLKPTRS; g++)
	ASSERT(gn->gn_child[g] == NULL);

	zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE);
	kmem_free(gn, sizeof (*gn));
	*gnpp = NULL;
	}

	static void
	zio_gang_tree_free(zio_gang_node_t **gnpp)
	{
	zio_gang_node_t gn = gnpp;

	if (gn == NULL)
	return;

	for (int g = 0; g < SPA_GBH_NBLKPTRS; g++)
	zio_gang_tree_free(&gn->gn_child[g]);

	zio_gang_node_free(gnpp);
	}

	static void
	zio_gang_tree_assemble(zio_t gio, blkptr_t bp, zio_gang_node_t **gnpp)
	{
	zio_gang_node_t *gn = zio_gang_node_alloc(gnpp);
	abd_t *gbh_abd = abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE);

	ASSERT(gio->io_gang_leader == gio);
	ASSERT(BP_IS_GANG(bp));

	zio_nowait(zio_read(gio, gio->io_spa, bp, gbh_abd, SPA_GANGBLOCKSIZE,
	zio_gang_tree_assemble_done, gn, gio->io_priority,
	ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark));
	}

	static void
	zio_gang_tree_assemble_done(zio_t *zio)
	{
	zio_t *gio = zio->io_gang_leader;
	zio_gang_node_t *gn = zio->io_private;
	blkptr_t *bp = zio->io_bp;

	ASSERT(gio == zio_unique_parent(zio));
	ASSERT(zio->io_child_count == 0);

	if (zio->io_error)
	return;

	/* this ABD was created from a linear buf in zio_gang_tree_assemble */
	if (BP_SHOULD_BYTESWAP(bp))
	byteswap_uint64_array(abd_to_buf(zio->io_abd), zio->io_size);

	ASSERT3P(abd_to_buf(zio->io_abd), ==, gn->gn_gbh);
	ASSERT(zio->io_size == SPA_GANGBLOCKSIZE);
	ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC);

	abd_free(zio->io_abd);

	for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) {
	blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g];
	if (!BP_IS_GANG(gbp))
	continue;
	zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]);
	}
	}

	static void
	zio_gang_tree_issue(zio_t pio, zio_gang_node_t gn, blkptr_t bp, abd_t data,
	uint64_t offset)
	{
	zio_t *gio = pio->io_gang_leader;
	zio_t *zio;

	ASSERT(BP_IS_GANG(bp) == !!gn);
	ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp));
	ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) \|\| gn == gio->io_gang_tree);

	/*
	* If you're a gang header, your data is in gn->gn_gbh.
	* If you're a gang member, your data is in 'data' and gn == NULL.
	*/
	zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data, offset);

	if (gn != NULL) {
	ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC);

	for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) {
	blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g];
	if (BP_IS_HOLE(gbp))
	continue;
	zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data,
	offset);
	offset += BP_GET_PSIZE(gbp);
	}
	}

	if (gn == gio->io_gang_tree)
	ASSERT3U(gio->io_size, ==, offset);

	if (zio != pio)
	zio_nowait(zio);
	}

	static zio_t *
	zio_gang_assemble(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;

	ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL);
	ASSERT(zio->io_child_type > ZIO_CHILD_GANG);

	zio->io_gang_leader = zio;

	zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree);

	return (zio);
	}

	static zio_t *
	zio_gang_issue(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;

	if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT, ZIO_WAIT_DONE)) {
	return (NULL);
	}

	ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio);
	ASSERT(zio->io_child_type > ZIO_CHILD_GANG);

	if (zio->io_child_error[ZIO_CHILD_GANG] == 0)
	zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_abd,
	0);
	else
	zio_gang_tree_free(&zio->io_gang_tree);

	zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;

	return (zio);
	}

	static void
	zio_write_gang_member_ready(zio_t *zio)
	{
	zio_t *pio = zio_unique_parent(zio);
	dva_t *cdva = zio->io_bp->blk_dva;
	dva_t *pdva = pio->io_bp->blk_dva;
	uint64_t asize;
	zio_t *gio __maybe_unused = zio->io_gang_leader;

	if (BP_IS_HOLE(zio->io_bp))
	return;

	ASSERT(BP_IS_HOLE(&zio->io_bp_orig));

	ASSERT(zio->io_child_type == ZIO_CHILD_GANG);
	ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies);
	ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp));
	ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp));
	ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp));

	mutex_enter(&pio->io_lock);
	for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) {
	ASSERT(DVA_GET_GANG(&pdva[d]));
	asize = DVA_GET_ASIZE(&pdva[d]);
	asize += DVA_GET_ASIZE(&cdva[d]);
	DVA_SET_ASIZE(&pdva[d], asize);
	}
	mutex_exit(&pio->io_lock);
	}

	static void
	zio_write_gang_done(zio_t *zio)
	{
	/*
	* The io_abd field will be NULL for a zio with no data. The io_flags
	* will initially have the ZIO_FLAG_NODATA bit flag set, but we can't
	* check for it here as it is cleared in zio_ready.
	*/
	if (zio->io_abd != NULL)
	abd_free(zio->io_abd);
	}

	static zio_t *
	zio_write_gang_block(zio_t pio, metaslab_class_t mc)
	{
	spa_t *spa = pio->io_spa;
	blkptr_t *bp = pio->io_bp;
	zio_t *gio = pio->io_gang_leader;
	zio_t *zio;
	zio_gang_node_t gn, *gnpp;
	zio_gbh_phys_t *gbh;
	abd_t *gbh_abd;
	uint64_t txg = pio->io_txg;
	uint64_t resid = pio->io_size;
	uint64_t lsize;
	int copies = gio->io_prop.zp_copies;
	int gbh_copies;
	zio_prop_t zp;
	int error;
	boolean_t has_data = !(pio->io_flags & ZIO_FLAG_NODATA);

	/*
	* encrypted blocks need DVA[2] free so encrypted gang headers can't
	* have a third copy.
	*/
	gbh_copies = MIN(copies + 1, spa_max_replication(spa));
	if (gio->io_prop.zp_encrypt && gbh_copies >= SPA_DVAS_PER_BP)
	gbh_copies = SPA_DVAS_PER_BP - 1;

	int flags = METASLAB_HINTBP_FAVOR \| METASLAB_GANG_HEADER;
	if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
	ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
	ASSERT(has_data);

	flags \|= METASLAB_ASYNC_ALLOC;
	VERIFY(zfs_refcount_held(&mc->mc_allocator[pio->io_allocator].
	mca_alloc_slots, pio));

	/*
	* The logical zio has already placed a reservation for
	* 'copies' allocation slots but gang blocks may require
	* additional copies. These additional copies
	* (i.e. gbh_copies - copies) are guaranteed to succeed
	* since metaslab_class_throttle_reserve() always allows
	* additional reservations for gang blocks.
	*/
	VERIFY(metaslab_class_throttle_reserve(mc, gbh_copies - copies,
	pio->io_allocator, pio, flags));
	}

	error = metaslab_alloc(spa, mc, SPA_GANGBLOCKSIZE,
	bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, flags,
	&pio->io_alloc_list, pio, pio->io_allocator);
	if (error) {
	if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
	ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
	ASSERT(has_data);

	/*
	* If we failed to allocate the gang block header then
	* we remove any additional allocation reservations that
	* we placed here. The original reservation will
	* be removed when the logical I/O goes to the ready
	* stage.
	*/
	metaslab_class_throttle_unreserve(mc,
	gbh_copies - copies, pio->io_allocator, pio);
	}

	pio->io_error = error;
	return (pio);
	}

	if (pio == gio) {
	gnpp = &gio->io_gang_tree;
	} else {
	gnpp = pio->io_private;
	ASSERT(pio->io_ready == zio_write_gang_member_ready);
	}

	gn = zio_gang_node_alloc(gnpp);
	gbh = gn->gn_gbh;
	bzero(gbh, SPA_GANGBLOCKSIZE);
	gbh_abd = abd_get_from_buf(gbh, SPA_GANGBLOCKSIZE);

	/*
	* Create the gang header.
	*/
	zio = zio_rewrite(pio, spa, txg, bp, gbh_abd, SPA_GANGBLOCKSIZE,
	zio_write_gang_done, NULL, pio->io_priority,
	ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark);

	/*
	* Create and nowait the gang children.
	*/
	for (int g = 0; resid != 0; resid -= lsize, g++) {
	lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g),
	SPA_MINBLOCKSIZE);
	ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid);

	zp.zp_checksum = gio->io_prop.zp_checksum;
	zp.zp_compress = ZIO_COMPRESS_OFF;
	zp.zp_complevel = gio->io_prop.zp_complevel;
	zp.zp_type = DMU_OT_NONE;
	zp.zp_level = 0;
	zp.zp_copies = gio->io_prop.zp_copies;
	zp.zp_dedup = B_FALSE;
	zp.zp_dedup_verify = B_FALSE;
	zp.zp_nopwrite = B_FALSE;
	zp.zp_encrypt = gio->io_prop.zp_encrypt;
	zp.zp_byteorder = gio->io_prop.zp_byteorder;
	bzero(zp.zp_salt, ZIO_DATA_SALT_LEN);
	bzero(zp.zp_iv, ZIO_DATA_IV_LEN);
	bzero(zp.zp_mac, ZIO_DATA_MAC_LEN);

	zio_t *cio = zio_write(zio, spa, txg, &gbh->zg_blkptr[g],
	has_data ? abd_get_offset(pio->io_abd, pio->io_size -
	resid) : NULL, lsize, lsize, &zp,
	zio_write_gang_member_ready, NULL, NULL,
	zio_write_gang_done, &gn->gn_child[g], pio->io_priority,
	ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark);

	if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
	ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
	ASSERT(has_data);

	/*
	* Gang children won't throttle but we should
	* account for their work, so reserve an allocation
	* slot for them here.
	*/
	VERIFY(metaslab_class_throttle_reserve(mc,
	zp.zp_copies, cio->io_allocator, cio, flags));
	}
	zio_nowait(cio);
	}

	/*
	* Set pio's pipeline to just wait for zio to finish.
	*/
	pio->io_pipeline = ZIO_INTERLOCK_PIPELINE;

	/*
	* We didn't allocate this bp, so make sure it doesn't get unmarked.
	*/
	pio->io_flags &= ~ZIO_FLAG_FASTWRITE;

	zio_nowait(zio);

	return (pio);
	}

	/*
	* The zio_nop_write stage in the pipeline determines if allocating a
	* new bp is necessary. The nopwrite feature can handle writes in
	* either syncing or open context (i.e. zil writes) and as a result is
	* mutually exclusive with dedup.
	*
	* By leveraging a cryptographically secure checksum, such as SHA256, we
	* can compare the checksums of the new data and the old to determine if
	* allocating a new block is required. Note that our requirements for
	* cryptographic strength are fairly weak: there can't be any accidental
	* hash collisions, but we don't need to be secure against intentional
	* (malicious) collisions. To trigger a nopwrite, you have to be able
	* to write the file to begin with, and triggering an incorrect (hash
	* collision) nopwrite is no worse than simply writing to the file.
	* That said, there are no known attacks against the checksum algorithms
	* used for nopwrite, assuming that the salt and the checksums
	* themselves remain secret.
	*/
	static zio_t *
	zio_nop_write(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;
	blkptr_t *bp_orig = &zio->io_bp_orig;
	zio_prop_t *zp = &zio->io_prop;

	ASSERT(BP_GET_LEVEL(bp) == 0);
	ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE));
	ASSERT(zp->zp_nopwrite);
	ASSERT(!zp->zp_dedup);
	ASSERT(zio->io_bp_override == NULL);
	ASSERT(IO_IS_ALLOCATING(zio));

	/*
	* Check to see if the original bp and the new bp have matching
	* characteristics (i.e. same checksum, compression algorithms, etc).
	* If they don't then just continue with the pipeline which will
	* allocate a new bp.
	*/
	if (BP_IS_HOLE(bp_orig) \|\|
	!(zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_flags &
	ZCHECKSUM_FLAG_NOPWRITE) \|\|
	BP_IS_ENCRYPTED(bp) \|\| BP_IS_ENCRYPTED(bp_orig) \|\|
	BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) \|\|
	BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) \|\|
	BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) \|\|
	zp->zp_copies != BP_GET_NDVAS(bp_orig))
	return (zio);

	/*
	* If the checksums match then reset the pipeline so that we
	* avoid allocating a new bp and issuing any I/O.
	*/
	if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) {
	ASSERT(zio_checksum_table[zp->zp_checksum].ci_flags &
	ZCHECKSUM_FLAG_NOPWRITE);
	ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig));
	ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig));
	ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF);
	ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop,
	sizeof (uint64_t)) == 0);

	/*
	* If we're overwriting a block that is currently on an
	* indirect vdev, then ignore the nopwrite request and
	* allow a new block to be allocated on a concrete vdev.
	*/
	spa_config_enter(zio->io_spa, SCL_VDEV, FTAG, RW_READER);
	vdev_t *tvd = vdev_lookup_top(zio->io_spa,
	DVA_GET_VDEV(&bp->blk_dva[0]));
	if (tvd->vdev_ops == &vdev_indirect_ops) {
	spa_config_exit(zio->io_spa, SCL_VDEV, FTAG);
	return (zio);
	}
	spa_config_exit(zio->io_spa, SCL_VDEV, FTAG);

	bp = bp_orig;
	zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;
	zio->io_flags \|= ZIO_FLAG_NOPWRITE;
	}

	return (zio);
	}

	/*
	* ==========================================================================
	* Dedup
	* ==========================================================================
	*/
	static void
	zio_ddt_child_read_done(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;
	ddt_entry_t *dde = zio->io_private;
	ddt_phys_t *ddp;
	zio_t *pio = zio_unique_parent(zio);

	mutex_enter(&pio->io_lock);
	ddp = ddt_phys_select(dde, bp);
	if (zio->io_error == 0)
	ddt_phys_clear(ddp); /* this ddp doesn't need repair */

	if (zio->io_error == 0 && dde->dde_repair_abd == NULL)
	dde->dde_repair_abd = zio->io_abd;
	else
	abd_free(zio->io_abd);
	mutex_exit(&pio->io_lock);
	}

	static zio_t *
	zio_ddt_read_start(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;

	ASSERT(BP_GET_DEDUP(bp));
	ASSERT(BP_GET_PSIZE(bp) == zio->io_size);
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);

	if (zio->io_child_error[ZIO_CHILD_DDT]) {
	ddt_t *ddt = ddt_select(zio->io_spa, bp);
	ddt_entry_t *dde = ddt_repair_start(ddt, bp);
	ddt_phys_t *ddp = dde->dde_phys;
	ddt_phys_t *ddp_self = ddt_phys_select(dde, bp);
	blkptr_t blk;

	ASSERT(zio->io_vsd == NULL);
	zio->io_vsd = dde;

	if (ddp_self == NULL)
	return (zio);

	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
	if (ddp->ddp_phys_birth == 0 \|\| ddp == ddp_self)
	continue;
	ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp,
	&blk);
	zio_nowait(zio_read(zio, zio->io_spa, &blk,
	abd_alloc_for_io(zio->io_size, B_TRUE),
	zio->io_size, zio_ddt_child_read_done, dde,
	zio->io_priority, ZIO_DDT_CHILD_FLAGS(zio) \|
	ZIO_FLAG_DONT_PROPAGATE, &zio->io_bookmark));
	}
	return (zio);
	}

	zio_nowait(zio_read(zio, zio->io_spa, bp,
	zio->io_abd, zio->io_size, NULL, NULL, zio->io_priority,
	ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark));

	return (zio);
	}

	static zio_t *
	zio_ddt_read_done(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;

	if (zio_wait_for_children(zio, ZIO_CHILD_DDT_BIT, ZIO_WAIT_DONE)) {
	return (NULL);
	}

	ASSERT(BP_GET_DEDUP(bp));
	ASSERT(BP_GET_PSIZE(bp) == zio->io_size);
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);

	if (zio->io_child_error[ZIO_CHILD_DDT]) {
	ddt_t *ddt = ddt_select(zio->io_spa, bp);
	ddt_entry_t *dde = zio->io_vsd;
	if (ddt == NULL) {
	ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE);
	return (zio);
	}
	if (dde == NULL) {
	zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1;
	zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE);
	return (NULL);
	}
	if (dde->dde_repair_abd != NULL) {
	abd_copy(zio->io_abd, dde->dde_repair_abd,
	zio->io_size);
	zio->io_child_error[ZIO_CHILD_DDT] = 0;
	}
	ddt_repair_done(ddt, dde);
	zio->io_vsd = NULL;
	}

	ASSERT(zio->io_vsd == NULL);

	return (zio);
	}

	static boolean_t
	zio_ddt_collision(zio_t zio, ddt_t ddt, ddt_entry_t *dde)
	{
	spa_t *spa = zio->io_spa;
	boolean_t do_raw = !!(zio->io_flags & ZIO_FLAG_RAW);

	ASSERT(!(zio->io_bp_override && do_raw));

	/*
	* Note: we compare the original data, not the transformed data,
	* because when zio->io_bp is an override bp, we will not have
	* pushed the I/O transforms. That's an important optimization
	* because otherwise we'd compress/encrypt all dmu_sync() data twice.
	* However, we should never get a raw, override zio so in these
	* cases we can compare the io_abd directly. This is useful because
	* it allows us to do dedup verification even if we don't have access
	* to the original data (for instance, if the encryption keys aren't
	* loaded).
	*/

	for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) {
	zio_t *lio = dde->dde_lead_zio[p];

	if (lio != NULL && do_raw) {
	return (lio->io_size != zio->io_size \|\|
	abd_cmp(zio->io_abd, lio->io_abd) != 0);
	} else if (lio != NULL) {
	return (lio->io_orig_size != zio->io_orig_size \|\|
	abd_cmp(zio->io_orig_abd, lio->io_orig_abd) != 0);
	}
	}

	for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) {
	ddt_phys_t *ddp = &dde->dde_phys[p];

	if (ddp->ddp_phys_birth != 0 && do_raw) {
	blkptr_t blk = *zio->io_bp;
	uint64_t psize;
	abd_t *tmpabd;
	int error;

	ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth);
	psize = BP_GET_PSIZE(&blk);

	if (psize != zio->io_size)
	return (B_TRUE);

	ddt_exit(ddt);

	tmpabd = abd_alloc_for_io(psize, B_TRUE);

	error = zio_wait(zio_read(NULL, spa, &blk, tmpabd,
	psize, NULL, NULL, ZIO_PRIORITY_SYNC_READ,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE \|
	ZIO_FLAG_RAW, &zio->io_bookmark));

	if (error == 0) {
	if (abd_cmp(tmpabd, zio->io_abd) != 0)
	error = SET_ERROR(ENOENT);
	}

	abd_free(tmpabd);
	ddt_enter(ddt);
	return (error != 0);
	} else if (ddp->ddp_phys_birth != 0) {
	arc_buf_t *abuf = NULL;
	arc_flags_t aflags = ARC_FLAG_WAIT;
	blkptr_t blk = *zio->io_bp;
	int error;

	ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth);

	if (BP_GET_LSIZE(&blk) != zio->io_orig_size)
	return (B_TRUE);

	ddt_exit(ddt);

	error = arc_read(NULL, spa, &blk,
	arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ,
	ZIO_FLAG_CANFAIL \| ZIO_FLAG_SPECULATIVE,
	&aflags, &zio->io_bookmark);

	if (error == 0) {
	if (abd_cmp_buf(zio->io_orig_abd, abuf->b_data,
	zio->io_orig_size) != 0)
	error = SET_ERROR(ENOENT);
	arc_buf_destroy(abuf, &abuf);
	}

	ddt_enter(ddt);
	return (error != 0);
	}
	}

	return (B_FALSE);
	}

	static void
	zio_ddt_child_write_ready(zio_t *zio)
	{
	int p = zio->io_prop.zp_copies;
	ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp);
	ddt_entry_t *dde = zio->io_private;
	ddt_phys_t *ddp = &dde->dde_phys[p];
	zio_t *pio;

	if (zio->io_error)
	return;

	ddt_enter(ddt);

	ASSERT(dde->dde_lead_zio[p] == zio);

	ddt_phys_fill(ddp, zio->io_bp);

	zio_link_t *zl = NULL;
	while ((pio = zio_walk_parents(zio, &zl)) != NULL)
	ddt_bp_fill(ddp, pio->io_bp, zio->io_txg);

	ddt_exit(ddt);
	}

	static void
	zio_ddt_child_write_done(zio_t *zio)
	{
	int p = zio->io_prop.zp_copies;
	ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp);
	ddt_entry_t *dde = zio->io_private;
	ddt_phys_t *ddp = &dde->dde_phys[p];

	ddt_enter(ddt);

	ASSERT(ddp->ddp_refcnt == 0);
	ASSERT(dde->dde_lead_zio[p] == zio);
	dde->dde_lead_zio[p] = NULL;

	if (zio->io_error == 0) {
	zio_link_t *zl = NULL;
	while (zio_walk_parents(zio, &zl) != NULL)
	ddt_phys_addref(ddp);
	} else {
	ddt_phys_clear(ddp);
	}

	ddt_exit(ddt);
	}

	static zio_t *
	zio_ddt_write(zio_t *zio)
	{
	spa_t *spa = zio->io_spa;
	blkptr_t *bp = zio->io_bp;
	uint64_t txg = zio->io_txg;
	zio_prop_t *zp = &zio->io_prop;
	int p = zp->zp_copies;
	zio_t *cio = NULL;
	ddt_t *ddt = ddt_select(spa, bp);
	ddt_entry_t *dde;
	ddt_phys_t *ddp;

	ASSERT(BP_GET_DEDUP(bp));
	ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum);
	ASSERT(BP_IS_HOLE(bp) \|\| zio->io_bp_override);
	ASSERT(!(zio->io_bp_override && (zio->io_flags & ZIO_FLAG_RAW)));

	ddt_enter(ddt);
	dde = ddt_lookup(ddt, bp, B_TRUE);
	ddp = &dde->dde_phys[p];

	if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) {
	/*
	* If we're using a weak checksum, upgrade to a strong checksum
	* and try again. If we're already using a strong checksum,
	* we can't resolve it, so just convert to an ordinary write.
	* (And automatically e-mail a paper to Nature?)
	*/
	if (!(zio_checksum_table[zp->zp_checksum].ci_flags &
	ZCHECKSUM_FLAG_DEDUP)) {
	zp->zp_checksum = spa_dedup_checksum(spa);
	zio_pop_transforms(zio);
	zio->io_stage = ZIO_STAGE_OPEN;
	BP_ZERO(bp);
	} else {
	zp->zp_dedup = B_FALSE;
	BP_SET_DEDUP(bp, B_FALSE);
	}
	ASSERT(!BP_GET_DEDUP(bp));
	zio->io_pipeline = ZIO_WRITE_PIPELINE;
	ddt_exit(ddt);
	return (zio);
	}

	if (ddp->ddp_phys_birth != 0 \|\| dde->dde_lead_zio[p] != NULL) {
	if (ddp->ddp_phys_birth != 0)
	ddt_bp_fill(ddp, bp, txg);
	if (dde->dde_lead_zio[p] != NULL)
	zio_add_child(zio, dde->dde_lead_zio[p]);
	else
	ddt_phys_addref(ddp);
	} else if (zio->io_bp_override) {
	ASSERT(bp->blk_birth == txg);
	ASSERT(BP_EQUAL(bp, zio->io_bp_override));
	ddt_phys_fill(ddp, bp);
	ddt_phys_addref(ddp);
	} else {
	cio = zio_write(zio, spa, txg, bp, zio->io_orig_abd,
	zio->io_orig_size, zio->io_orig_size, zp,
	zio_ddt_child_write_ready, NULL, NULL,
	zio_ddt_child_write_done, dde, zio->io_priority,
	ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark);

	zio_push_transform(cio, zio->io_abd, zio->io_size, 0, NULL);
	dde->dde_lead_zio[p] = cio;
	}

	ddt_exit(ddt);

	zio_nowait(cio);

	return (zio);
	}

	ddt_entry_t freedde; / for debugging */

	static zio_t *
	zio_ddt_free(zio_t *zio)
	{
	spa_t *spa = zio->io_spa;
	blkptr_t *bp = zio->io_bp;
	ddt_t *ddt = ddt_select(spa, bp);
	ddt_entry_t *dde;
	ddt_phys_t *ddp;

	ASSERT(BP_GET_DEDUP(bp));
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);

	ddt_enter(ddt);
	freedde = dde = ddt_lookup(ddt, bp, B_TRUE);
	if (dde) {
	ddp = ddt_phys_select(dde, bp);
	if (ddp)
	ddt_phys_decref(ddp);
	}
	ddt_exit(ddt);

	return (zio);
	}

	/*
	* ==========================================================================
	* Allocate and free blocks
	* ==========================================================================
	*/

	static zio_t *
	zio_io_to_allocate(spa_t *spa, int allocator)
	{
	zio_t *zio;

	- ASSERT(MUTEX_HELD(&spa->spa_alloc_locks[allocator]));
	+ ASSERT(MUTEX_HELD(&spa->spa_allocs[allocator].spaa_lock));

	- zio = avl_first(&spa->spa_alloc_trees[allocator]);
	+ zio = avl_first(&spa->spa_allocs[allocator].spaa_tree);
	if (zio == NULL)
	return (NULL);

	ASSERT(IO_IS_ALLOCATING(zio));

	/*
	* Try to place a reservation for this zio. If we're unable to
	* reserve then we throttle.
	*/
	ASSERT3U(zio->io_allocator, ==, allocator);
	if (!metaslab_class_throttle_reserve(zio->io_metaslab_class,
	- zio->io_prop.zp_copies, zio->io_allocator, zio, 0)) {
	+ zio->io_prop.zp_copies, allocator, zio, 0)) {
	return (NULL);
	}

	- avl_remove(&spa->spa_alloc_trees[allocator], zio);
	+ avl_remove(&spa->spa_allocs[allocator].spaa_tree, zio);
	ASSERT3U(zio->io_stage, <, ZIO_STAGE_DVA_ALLOCATE);

	return (zio);
	}

	static zio_t *
	zio_dva_throttle(zio_t *zio)
	{
	spa_t *spa = zio->io_spa;
	zio_t *nio;
	metaslab_class_t *mc;

	/* locate an appropriate allocation class */
	mc = spa_preferred_class(spa, zio->io_size, zio->io_prop.zp_type,
	zio->io_prop.zp_level, zio->io_prop.zp_zpl_smallblk);

	if (zio->io_priority == ZIO_PRIORITY_SYNC_WRITE \|\|
	!mc->mc_alloc_throttle_enabled \|\|
	zio->io_child_type == ZIO_CHILD_GANG \|\|
	zio->io_flags & ZIO_FLAG_NODATA) {
	return (zio);
	}

	+ ASSERT(zio->io_type == ZIO_TYPE_WRITE);
	ASSERT(zio->io_child_type > ZIO_CHILD_GANG);
	-
	ASSERT3U(zio->io_queued_timestamp, >, 0);
	ASSERT(zio->io_stage == ZIO_STAGE_DVA_THROTTLE);

	zbookmark_phys_t *bm = &zio->io_bookmark;
	/*
	* We want to try to use as many allocators as possible to help improve
	* performance, but we also want logically adjacent IOs to be physically
	* adjacent to improve sequential read performance. We chunk each object
	* into 2^20 block regions, and then hash based on the objset, object,
	* level, and region to accomplish both of these goals.
	*/
	- zio->io_allocator = cityhash4(bm->zb_objset, bm->zb_object,
	+ int allocator = (uint_t)cityhash4(bm->zb_objset, bm->zb_object,
	bm->zb_level, bm->zb_blkid >> 20) % spa->spa_alloc_count;
	- mutex_enter(&spa->spa_alloc_locks[zio->io_allocator]);
	- ASSERT(zio->io_type == ZIO_TYPE_WRITE);
	+ zio->io_allocator = allocator;
	zio->io_metaslab_class = mc;
	- avl_add(&spa->spa_alloc_trees[zio->io_allocator], zio);
	- nio = zio_io_to_allocate(spa, zio->io_allocator);
	- mutex_exit(&spa->spa_alloc_locks[zio->io_allocator]);
	+ mutex_enter(&spa->spa_allocs[allocator].spaa_lock);
	+ avl_add(&spa->spa_allocs[allocator].spaa_tree, zio);
	+ nio = zio_io_to_allocate(spa, allocator);
	+ mutex_exit(&spa->spa_allocs[allocator].spaa_lock);
	return (nio);
	}

	static void
	zio_allocate_dispatch(spa_t *spa, int allocator)
	{
	zio_t *zio;

	- mutex_enter(&spa->spa_alloc_locks[allocator]);
	+ mutex_enter(&spa->spa_allocs[allocator].spaa_lock);
	zio = zio_io_to_allocate(spa, allocator);
	- mutex_exit(&spa->spa_alloc_locks[allocator]);
	+ mutex_exit(&spa->spa_allocs[allocator].spaa_lock);
	if (zio == NULL)
	return;

	ASSERT3U(zio->io_stage, ==, ZIO_STAGE_DVA_THROTTLE);
	ASSERT0(zio->io_error);
	zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_TRUE);
	}

	static zio_t *
	zio_dva_allocate(zio_t *zio)
	{
	spa_t *spa = zio->io_spa;
	metaslab_class_t *mc;
	blkptr_t *bp = zio->io_bp;
	int error;
	int flags = 0;

	if (zio->io_gang_leader == NULL) {
	ASSERT(zio->io_child_type > ZIO_CHILD_GANG);
	zio->io_gang_leader = zio;
	}

	ASSERT(BP_IS_HOLE(bp));
	ASSERT0(BP_GET_NDVAS(bp));
	ASSERT3U(zio->io_prop.zp_copies, >, 0);
	ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa));
	ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp));

	flags \|= (zio->io_flags & ZIO_FLAG_FASTWRITE) ? METASLAB_FASTWRITE : 0;
	if (zio->io_flags & ZIO_FLAG_NODATA)
	flags \|= METASLAB_DONT_THROTTLE;
	if (zio->io_flags & ZIO_FLAG_GANG_CHILD)
	flags \|= METASLAB_GANG_CHILD;
	if (zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE)
	flags \|= METASLAB_ASYNC_ALLOC;

	/*
	* if not already chosen, locate an appropriate allocation class
	*/
	mc = zio->io_metaslab_class;
	if (mc == NULL) {
	mc = spa_preferred_class(spa, zio->io_size,
	zio->io_prop.zp_type, zio->io_prop.zp_level,
	zio->io_prop.zp_zpl_smallblk);
	zio->io_metaslab_class = mc;
	}

	/*
	* Try allocating the block in the usual metaslab class.
	* If that's full, allocate it in the normal class.
	* If that's full, allocate as a gang block,
	* and if all are full, the allocation fails (which shouldn't happen).
	*
	* Note that we do not fall back on embedded slog (ZIL) space, to
	* preserve unfragmented slog space, which is critical for decent
	* sync write performance. If a log allocation fails, we will fall
	* back to spa_sync() which is abysmal for performance.
	*/
	error = metaslab_alloc(spa, mc, zio->io_size, bp,
	zio->io_prop.zp_copies, zio->io_txg, NULL, flags,
	&zio->io_alloc_list, zio, zio->io_allocator);

	/*
	* Fallback to normal class when an alloc class is full
	*/
	if (error == ENOSPC && mc != spa_normal_class(spa)) {
	/*
	* If throttling, transfer reservation over to normal class.
	* The io_allocator slot can remain the same even though we
	* are switching classes.
	*/
	if (mc->mc_alloc_throttle_enabled &&
	(zio->io_flags & ZIO_FLAG_IO_ALLOCATING)) {
	metaslab_class_throttle_unreserve(mc,
	zio->io_prop.zp_copies, zio->io_allocator, zio);
	zio->io_flags &= ~ZIO_FLAG_IO_ALLOCATING;

	VERIFY(metaslab_class_throttle_reserve(
	spa_normal_class(spa),
	zio->io_prop.zp_copies, zio->io_allocator, zio,
	flags \| METASLAB_MUST_RESERVE));
	}
	zio->io_metaslab_class = mc = spa_normal_class(spa);
	if (zfs_flags & ZFS_DEBUG_METASLAB_ALLOC) {
	zfs_dbgmsg("%s: metaslab allocation failure, "
	"trying normal class: zio %px, size %llu, error %d",
	spa_name(spa), zio, (u_longlong_t)zio->io_size,
	error);
	}

	error = metaslab_alloc(spa, mc, zio->io_size, bp,
	zio->io_prop.zp_copies, zio->io_txg, NULL, flags,
	&zio->io_alloc_list, zio, zio->io_allocator);
	}

	if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) {
	if (zfs_flags & ZFS_DEBUG_METASLAB_ALLOC) {
	zfs_dbgmsg("%s: metaslab allocation failure, "
	"trying ganging: zio %px, size %llu, error %d",
	spa_name(spa), zio, (u_longlong_t)zio->io_size,
	error);
	}
	return (zio_write_gang_block(zio, mc));
	}
	if (error != 0) {
	if (error != ENOSPC \|\|
	(zfs_flags & ZFS_DEBUG_METASLAB_ALLOC)) {
	zfs_dbgmsg("%s: metaslab allocation failure: zio %px, "
	"size %llu, error %d",
	spa_name(spa), zio, (u_longlong_t)zio->io_size,
	error);
	}
	zio->io_error = error;
	}

	return (zio);
	}

	static zio_t *
	zio_dva_free(zio_t *zio)
	{
	metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE);

	return (zio);
	}

	static zio_t *
	zio_dva_claim(zio_t *zio)
	{
	int error;

	error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg);
	if (error)
	zio->io_error = error;

	return (zio);
	}

	/*
	* Undo an allocation. This is used by zio_done() when an I/O fails
	* and we want to give back the block we just allocated.
	* This handles both normal blocks and gang blocks.
	*/
	static void
	zio_dva_unallocate(zio_t zio, zio_gang_node_t gn, blkptr_t *bp)
	{
	ASSERT(bp->blk_birth == zio->io_txg \|\| BP_IS_HOLE(bp));
	ASSERT(zio->io_bp_override == NULL);

	if (!BP_IS_HOLE(bp))
	metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE);

	if (gn != NULL) {
	for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) {
	zio_dva_unallocate(zio, gn->gn_child[g],
	&gn->gn_gbh->zg_blkptr[g]);
	}
	}
	}

	/*
	* Try to allocate an intent log block. Return 0 on success, errno on failure.
	*/
	int
	zio_alloc_zil(spa_t spa, objset_t os, uint64_t txg, blkptr_t *new_bp,
	uint64_t size, boolean_t *slog)
	{
	int error = 1;
	zio_alloc_list_t io_alloc_list;

	ASSERT(txg > spa_syncing_txg(spa));

	metaslab_trace_init(&io_alloc_list);

	/*
	* Block pointer fields are useful to metaslabs for stats and debugging.
	* Fill in the obvious ones before calling into metaslab_alloc().
	*/
	BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG);
	BP_SET_PSIZE(new_bp, size);
	BP_SET_LEVEL(new_bp, 0);

	/*
	* When allocating a zil block, we don't have information about
	* the final destination of the block except the objset it's part
	* of, so we just hash the objset ID to pick the allocator to get
	* some parallelism.
	*/
	int flags = METASLAB_FASTWRITE \| METASLAB_ZIL;
	- int allocator = cityhash4(0, 0, 0, os->os_dsl_dataset->ds_object) %
	- spa->spa_alloc_count;
	+ int allocator = (uint_t)cityhash4(0, 0, 0,
	+ os->os_dsl_dataset->ds_object) % spa->spa_alloc_count;
	error = metaslab_alloc(spa, spa_log_class(spa), size, new_bp, 1,
	txg, NULL, flags, &io_alloc_list, NULL, allocator);
	*slog = (error == 0);
	if (error != 0) {
	error = metaslab_alloc(spa, spa_embedded_log_class(spa), size,
	new_bp, 1, txg, NULL, flags,
	&io_alloc_list, NULL, allocator);
	}
	if (error != 0) {
	error = metaslab_alloc(spa, spa_normal_class(spa), size,
	new_bp, 1, txg, NULL, flags,
	&io_alloc_list, NULL, allocator);
	}
	metaslab_trace_fini(&io_alloc_list);

	if (error == 0) {
	BP_SET_LSIZE(new_bp, size);
	BP_SET_PSIZE(new_bp, size);
	BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF);
	BP_SET_CHECKSUM(new_bp,
	spa_version(spa) >= SPA_VERSION_SLIM_ZIL
	? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG);
	BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG);
	BP_SET_LEVEL(new_bp, 0);
	BP_SET_DEDUP(new_bp, 0);
	BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER);

	/*
	* encrypted blocks will require an IV and salt. We generate
	* these now since we will not be rewriting the bp at
	* rewrite time.
	*/
	if (os->os_encrypted) {
	uint8_t iv[ZIO_DATA_IV_LEN];
	uint8_t salt[ZIO_DATA_SALT_LEN];

	BP_SET_CRYPT(new_bp, B_TRUE);
	VERIFY0(spa_crypt_get_salt(spa,
	dmu_objset_id(os), salt));
	VERIFY0(zio_crypt_generate_iv(iv));

	zio_crypt_encode_params_bp(new_bp, salt, iv);
	}
	} else {
	zfs_dbgmsg("%s: zil block allocation failure: "
	"size %llu, error %d", spa_name(spa), (u_longlong_t)size,
	error);
	}

	return (error);
	}

	/*
	* ==========================================================================
	* Read and write to physical devices
	* ==========================================================================
	*/

	/*
	* Issue an I/O to the underlying vdev. Typically the issue pipeline
	* stops after this stage and will resume upon I/O completion.
	* However, there are instances where the vdev layer may need to
	* continue the pipeline when an I/O was not issued. Since the I/O
	* that was sent to the vdev layer might be different than the one
	* currently active in the pipeline (see vdev_queue_io()), we explicitly
	* force the underlying vdev layers to call either zio_execute() or
	* zio_interrupt() to ensure that the pipeline continues with the correct I/O.
	*/
	static zio_t *
	zio_vdev_io_start(zio_t *zio)
	{
	vdev_t *vd = zio->io_vd;
	uint64_t align;
	spa_t *spa = zio->io_spa;

	zio->io_delay = 0;

	ASSERT(zio->io_error == 0);
	ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0);

	if (vd == NULL) {
	if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER))
	spa_config_enter(spa, SCL_ZIO, zio, RW_READER);

	/*
	* The mirror_ops handle multiple DVAs in a single BP.
	*/
	vdev_mirror_ops.vdev_op_io_start(zio);
	return (NULL);
	}

	ASSERT3P(zio->io_logical, !=, zio);
	if (zio->io_type == ZIO_TYPE_WRITE) {
	ASSERT(spa->spa_trust_config);

	/*
	* Note: the code can handle other kinds of writes,
	* but we don't expect them.
	*/
	if (zio->io_vd->vdev_removing) {
	ASSERT(zio->io_flags &
	(ZIO_FLAG_PHYSICAL \| ZIO_FLAG_SELF_HEAL \|
	ZIO_FLAG_RESILVER \| ZIO_FLAG_INDUCE_DAMAGE));
	}
	}

	align = 1ULL << vd->vdev_top->vdev_ashift;

	if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) &&
	P2PHASE(zio->io_size, align) != 0) {
	/* Transform logical writes to be a full physical block size. */
	uint64_t asize = P2ROUNDUP(zio->io_size, align);
	abd_t *abuf = abd_alloc_sametype(zio->io_abd, asize);
	ASSERT(vd == vd->vdev_top);
	if (zio->io_type == ZIO_TYPE_WRITE) {
	abd_copy(abuf, zio->io_abd, zio->io_size);
	abd_zero_off(abuf, zio->io_size, asize - zio->io_size);
	}
	zio_push_transform(zio, abuf, asize, asize, zio_subblock);
	}

	/*
	* If this is not a physical io, make sure that it is properly aligned
	* before proceeding.
	*/
	if (!(zio->io_flags & ZIO_FLAG_PHYSICAL)) {
	ASSERT0(P2PHASE(zio->io_offset, align));
	ASSERT0(P2PHASE(zio->io_size, align));
	} else {
	/*
	* For physical writes, we allow 512b aligned writes and assume
	* the device will perform a read-modify-write as necessary.
	*/
	ASSERT0(P2PHASE(zio->io_offset, SPA_MINBLOCKSIZE));
	ASSERT0(P2PHASE(zio->io_size, SPA_MINBLOCKSIZE));
	}

	VERIFY(zio->io_type != ZIO_TYPE_WRITE \|\| spa_writeable(spa));

	/*
	* If this is a repair I/O, and there's no self-healing involved --
	* that is, we're just resilvering what we expect to resilver --
	* then don't do the I/O unless zio's txg is actually in vd's DTL.
	* This prevents spurious resilvering.
	*
	* There are a few ways that we can end up creating these spurious
	* resilver i/os:
	*
	* 1. A resilver i/o will be issued if any DVA in the BP has a
	* dirty DTL. The mirror code will issue resilver writes to
	* each DVA, including the one(s) that are not on vdevs with dirty
	* DTLs.
	*
	* 2. With nested replication, which happens when we have a
	* "replacing" or "spare" vdev that's a child of a mirror or raidz.
	* For example, given mirror(replacing(A+B), C), it's likely that
	* only A is out of date (it's the new device). In this case, we'll
	* read from C, then use the data to resilver A+B -- but we don't
	* actually want to resilver B, just A. The top-level mirror has no
	* way to know this, so instead we just discard unnecessary repairs
	* as we work our way down the vdev tree.
	*
	* 3. ZTEST also creates mirrors of mirrors, mirrors of raidz, etc.
	* The same logic applies to any form of nested replication: ditto
	* + mirror, RAID-Z + replacing, etc.
	*
	* However, indirect vdevs point off to other vdevs which may have
	* DTL's, so we never bypass them. The child i/os on concrete vdevs
	* will be properly bypassed instead.
	*
	* Leaf DTL_PARTIAL can be empty when a legitimate write comes from
	* a dRAID spare vdev. For example, when a dRAID spare is first
	* used, its spare blocks need to be written to but the leaf vdev's
	* of such blocks can have empty DTL_PARTIAL.
	*
	* There seemed no clean way to allow such writes while bypassing
	* spurious ones. At this point, just avoid all bypassing for dRAID
	* for correctness.
	*/
	if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) &&
	!(zio->io_flags & ZIO_FLAG_SELF_HEAL) &&
	zio->io_txg != 0 && /* not a delegated i/o */
	vd->vdev_ops != &vdev_indirect_ops &&
	vd->vdev_top->vdev_ops != &vdev_draid_ops &&
	!vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) {
	ASSERT(zio->io_type == ZIO_TYPE_WRITE);
	zio_vdev_io_bypass(zio);
	return (zio);
	}

	/*
	* Select the next best leaf I/O to process. Distributed spares are
	* excluded since they dispatch the I/O directly to a leaf vdev after
	* applying the dRAID mapping.
	*/
	if (vd->vdev_ops->vdev_op_leaf &&
	vd->vdev_ops != &vdev_draid_spare_ops &&
	(zio->io_type == ZIO_TYPE_READ \|\|
	zio->io_type == ZIO_TYPE_WRITE \|\|
	zio->io_type == ZIO_TYPE_TRIM)) {

	if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio))
	return (zio);

	if ((zio = vdev_queue_io(zio)) == NULL)
	return (NULL);

	if (!vdev_accessible(vd, zio)) {
	zio->io_error = SET_ERROR(ENXIO);
	zio_interrupt(zio);
	return (NULL);
	}
	zio->io_delay = gethrtime();
	}

	vd->vdev_ops->vdev_op_io_start(zio);
	return (NULL);
	}

	static zio_t *
	zio_vdev_io_done(zio_t *zio)
	{
	vdev_t *vd = zio->io_vd;
	vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops;
	boolean_t unexpected_error = B_FALSE;

	if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) {
	return (NULL);
	}

	ASSERT(zio->io_type == ZIO_TYPE_READ \|\|
	zio->io_type == ZIO_TYPE_WRITE \|\| zio->io_type == ZIO_TYPE_TRIM);

	if (zio->io_delay)
	zio->io_delay = gethrtime() - zio->io_delay;

	if (vd != NULL && vd->vdev_ops->vdev_op_leaf &&
	vd->vdev_ops != &vdev_draid_spare_ops) {
	vdev_queue_io_done(zio);

	if (zio->io_type == ZIO_TYPE_WRITE)
	vdev_cache_write(zio);

	if (zio_injection_enabled && zio->io_error == 0)
	zio->io_error = zio_handle_device_injections(vd, zio,
	EIO, EILSEQ);

	if (zio_injection_enabled && zio->io_error == 0)
	zio->io_error = zio_handle_label_injection(zio, EIO);

	if (zio->io_error && zio->io_type != ZIO_TYPE_TRIM) {
	if (!vdev_accessible(vd, zio)) {
	zio->io_error = SET_ERROR(ENXIO);
	} else {
	unexpected_error = B_TRUE;
	}
	}
	}

	ops->vdev_op_io_done(zio);

	if (unexpected_error)
	VERIFY(vdev_probe(vd, zio) == NULL);

	return (zio);
	}

	/*
	* This function is used to change the priority of an existing zio that is
	* currently in-flight. This is used by the arc to upgrade priority in the
	* event that a demand read is made for a block that is currently queued
	* as a scrub or async read IO. Otherwise, the high priority read request
	* would end up having to wait for the lower priority IO.
	*/
	void
	zio_change_priority(zio_t *pio, zio_priority_t priority)
	{
	zio_t cio, cio_next;
	zio_link_t *zl = NULL;

	ASSERT3U(priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);

	if (pio->io_vd != NULL && pio->io_vd->vdev_ops->vdev_op_leaf) {
	vdev_queue_change_io_priority(pio, priority);
	} else {
	pio->io_priority = priority;
	}

	mutex_enter(&pio->io_lock);
	for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) {
	cio_next = zio_walk_children(pio, &zl);
	zio_change_priority(cio, priority);
	}
	mutex_exit(&pio->io_lock);
	}

	/*
	* For non-raidz ZIOs, we can just copy aside the bad data read from the
	* disk, and use that to finish the checksum ereport later.
	*/
	static void
	zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr,
	const abd_t *good_buf)
	{
	/* no processing needed */
	zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE);
	}

	/ARGSUSED/
	void
	zio_vsd_default_cksum_report(zio_t zio, zio_cksum_report_t zcr)
	{
	void *abd = abd_alloc_sametype(zio->io_abd, zio->io_size);

	abd_copy(abd, zio->io_abd, zio->io_size);

	zcr->zcr_cbinfo = zio->io_size;
	zcr->zcr_cbdata = abd;
	zcr->zcr_finish = zio_vsd_default_cksum_finish;
	zcr->zcr_free = zio_abd_free;
	}

	static zio_t *
	zio_vdev_io_assess(zio_t *zio)
	{
	vdev_t *vd = zio->io_vd;

	if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) {
	return (NULL);
	}

	if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER))
	spa_config_exit(zio->io_spa, SCL_ZIO, zio);

	if (zio->io_vsd != NULL) {
	zio->io_vsd_ops->vsd_free(zio);
	zio->io_vsd = NULL;
	}

	if (zio_injection_enabled && zio->io_error == 0)
	zio->io_error = zio_handle_fault_injection(zio, EIO);

	/*
	* If the I/O failed, determine whether we should attempt to retry it.
	*
	* On retry, we cut in line in the issue queue, since we don't want
	* compression/checksumming/etc. work to prevent our (cheap) IO reissue.
	*/
	if (zio->io_error && vd == NULL &&
	!(zio->io_flags & (ZIO_FLAG_DONT_RETRY \| ZIO_FLAG_IO_RETRY))) {
	ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */
	ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */
	zio->io_error = 0;
	zio->io_flags \|= ZIO_FLAG_IO_RETRY \|
	ZIO_FLAG_DONT_CACHE \| ZIO_FLAG_DONT_AGGREGATE;
	zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1;
	zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE,
	zio_requeue_io_start_cut_in_line);
	return (NULL);
	}

	/*
	* If we got an error on a leaf device, convert it to ENXIO
	* if the device is not accessible at all.
	*/
	if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf &&
	!vdev_accessible(vd, zio))
	zio->io_error = SET_ERROR(ENXIO);

	/*
	* If we can't write to an interior vdev (mirror or RAID-Z),
	* set vdev_cant_write so that we stop trying to allocate from it.
	*/
	if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE &&
	vd != NULL && !vd->vdev_ops->vdev_op_leaf) {
	vdev_dbgmsg(vd, "zio_vdev_io_assess(zio=%px) setting "
	"cant_write=TRUE due to write failure with ENXIO",
	zio);
	vd->vdev_cant_write = B_TRUE;
	}

	/*
	* If a cache flush returns ENOTSUP or ENOTTY, we know that no future
	* attempts will ever succeed. In this case we set a persistent
	* boolean flag so that we don't bother with it in the future.
	*/
	if ((zio->io_error == ENOTSUP \|\| zio->io_error == ENOTTY) &&
	zio->io_type == ZIO_TYPE_IOCTL &&
	zio->io_cmd == DKIOCFLUSHWRITECACHE && vd != NULL)
	vd->vdev_nowritecache = B_TRUE;

	if (zio->io_error)
	zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;

	if (vd != NULL && vd->vdev_ops->vdev_op_leaf &&
	zio->io_physdone != NULL) {
	ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED));
	ASSERT(zio->io_child_type == ZIO_CHILD_VDEV);
	zio->io_physdone(zio->io_logical);
	}

	return (zio);
	}

	void
	zio_vdev_io_reissue(zio_t *zio)
	{
	ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START);
	ASSERT(zio->io_error == 0);

	zio->io_stage >>= 1;
	}

	void
	zio_vdev_io_redone(zio_t *zio)
	{
	ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE);

	zio->io_stage >>= 1;
	}

	void
	zio_vdev_io_bypass(zio_t *zio)
	{
	ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START);
	ASSERT(zio->io_error == 0);

	zio->io_flags \|= ZIO_FLAG_IO_BYPASS;
	zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1;
	}

	/*
	* ==========================================================================
	* Encrypt and store encryption parameters
	* ==========================================================================
	*/


	/*
	* This function is used for ZIO_STAGE_ENCRYPT. It is responsible for
	* managing the storage of encryption parameters and passing them to the
	* lower-level encryption functions.
	*/
	static zio_t *
	zio_encrypt(zio_t *zio)
	{
	zio_prop_t *zp = &zio->io_prop;
	spa_t *spa = zio->io_spa;
	blkptr_t *bp = zio->io_bp;
	uint64_t psize = BP_GET_PSIZE(bp);
	uint64_t dsobj = zio->io_bookmark.zb_objset;
	dmu_object_type_t ot = BP_GET_TYPE(bp);
	void *enc_buf = NULL;
	abd_t *eabd = NULL;
	uint8_t salt[ZIO_DATA_SALT_LEN];
	uint8_t iv[ZIO_DATA_IV_LEN];
	uint8_t mac[ZIO_DATA_MAC_LEN];
	boolean_t no_crypt = B_FALSE;

	/* the root zio already encrypted the data */
	if (zio->io_child_type == ZIO_CHILD_GANG)
	return (zio);

	/* only ZIL blocks are re-encrypted on rewrite */
	if (!IO_IS_ALLOCATING(zio) && ot != DMU_OT_INTENT_LOG)
	return (zio);

	if (!(zp->zp_encrypt \|\| BP_IS_ENCRYPTED(bp))) {
	BP_SET_CRYPT(bp, B_FALSE);
	return (zio);
	}

	/* if we are doing raw encryption set the provided encryption params */
	if (zio->io_flags & ZIO_FLAG_RAW_ENCRYPT) {
	ASSERT0(BP_GET_LEVEL(bp));
	BP_SET_CRYPT(bp, B_TRUE);
	BP_SET_BYTEORDER(bp, zp->zp_byteorder);
	if (ot != DMU_OT_OBJSET)
	zio_crypt_encode_mac_bp(bp, zp->zp_mac);

	/* dnode blocks must be written out in the provided byteorder */
	if (zp->zp_byteorder != ZFS_HOST_BYTEORDER &&
	ot == DMU_OT_DNODE) {
	void *bswap_buf = zio_buf_alloc(psize);
	abd_t *babd = abd_get_from_buf(bswap_buf, psize);

	ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF);
	abd_copy_to_buf(bswap_buf, zio->io_abd, psize);
	dmu_ot_byteswap[DMU_OT_BYTESWAP(ot)].ob_func(bswap_buf,
	psize);

	abd_take_ownership_of_buf(babd, B_TRUE);
	zio_push_transform(zio, babd, psize, psize, NULL);
	}

	if (DMU_OT_IS_ENCRYPTED(ot))
	zio_crypt_encode_params_bp(bp, zp->zp_salt, zp->zp_iv);
	return (zio);
	}

	/* indirect blocks only maintain a cksum of the lower level MACs */
	if (BP_GET_LEVEL(bp) > 0) {
	BP_SET_CRYPT(bp, B_TRUE);
	VERIFY0(zio_crypt_do_indirect_mac_checksum_abd(B_TRUE,
	zio->io_orig_abd, BP_GET_LSIZE(bp), BP_SHOULD_BYTESWAP(bp),
	mac));
	zio_crypt_encode_mac_bp(bp, mac);
	return (zio);
	}

	/*
	* Objset blocks are a special case since they have 2 256-bit MACs
	* embedded within them.
	*/
	if (ot == DMU_OT_OBJSET) {
	ASSERT0(DMU_OT_IS_ENCRYPTED(ot));
	ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF);
	BP_SET_CRYPT(bp, B_TRUE);
	VERIFY0(spa_do_crypt_objset_mac_abd(B_TRUE, spa, dsobj,
	zio->io_abd, psize, BP_SHOULD_BYTESWAP(bp)));
	return (zio);
	}

	/* unencrypted object types are only authenticated with a MAC */
	if (!DMU_OT_IS_ENCRYPTED(ot)) {
	BP_SET_CRYPT(bp, B_TRUE);
	VERIFY0(spa_do_crypt_mac_abd(B_TRUE, spa, dsobj,
	zio->io_abd, psize, mac));
	zio_crypt_encode_mac_bp(bp, mac);
	return (zio);
	}

	/*
	* Later passes of sync-to-convergence may decide to rewrite data
	* in place to avoid more disk reallocations. This presents a problem
	* for encryption because this constitutes rewriting the new data with
	* the same encryption key and IV. However, this only applies to blocks
	* in the MOS (particularly the spacemaps) and we do not encrypt the
	* MOS. We assert that the zio is allocating or an intent log write
	* to enforce this.
	*/
	ASSERT(IO_IS_ALLOCATING(zio) \|\| ot == DMU_OT_INTENT_LOG);
	ASSERT(BP_GET_LEVEL(bp) == 0 \|\| ot == DMU_OT_INTENT_LOG);
	ASSERT(spa_feature_is_active(spa, SPA_FEATURE_ENCRYPTION));
	ASSERT3U(psize, !=, 0);

	enc_buf = zio_buf_alloc(psize);
	eabd = abd_get_from_buf(enc_buf, psize);
	abd_take_ownership_of_buf(eabd, B_TRUE);

	/*
	* For an explanation of what encryption parameters are stored
	* where, see the block comment in zio_crypt.c.
	*/
	if (ot == DMU_OT_INTENT_LOG) {
	zio_crypt_decode_params_bp(bp, salt, iv);
	} else {
	BP_SET_CRYPT(bp, B_TRUE);
	}

	/* Perform the encryption. This should not fail */
	VERIFY0(spa_do_crypt_abd(B_TRUE, spa, &zio->io_bookmark,
	BP_GET_TYPE(bp), BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp),
	salt, iv, mac, psize, zio->io_abd, eabd, &no_crypt));

	/* encode encryption metadata into the bp */
	if (ot == DMU_OT_INTENT_LOG) {
	/*
	* ZIL blocks store the MAC in the embedded checksum, so the
	* transform must always be applied.
	*/
	zio_crypt_encode_mac_zil(enc_buf, mac);
	zio_push_transform(zio, eabd, psize, psize, NULL);
	} else {
	BP_SET_CRYPT(bp, B_TRUE);
	zio_crypt_encode_params_bp(bp, salt, iv);
	zio_crypt_encode_mac_bp(bp, mac);

	if (no_crypt) {
	ASSERT3U(ot, ==, DMU_OT_DNODE);
	abd_free(eabd);
	} else {
	zio_push_transform(zio, eabd, psize, psize, NULL);
	}
	}

	return (zio);
	}

	/*
	* ==========================================================================
	* Generate and verify checksums
	* ==========================================================================
	*/
	static zio_t *
	zio_checksum_generate(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;
	enum zio_checksum checksum;

	if (bp == NULL) {
	/*
	* This is zio_write_phys().
	* We're either generating a label checksum, or none at all.
	*/
	checksum = zio->io_prop.zp_checksum;

	if (checksum == ZIO_CHECKSUM_OFF)
	return (zio);

	ASSERT(checksum == ZIO_CHECKSUM_LABEL);
	} else {
	if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) {
	ASSERT(!IO_IS_ALLOCATING(zio));
	checksum = ZIO_CHECKSUM_GANG_HEADER;
	} else {
	checksum = BP_GET_CHECKSUM(bp);
	}
	}

	zio_checksum_compute(zio, checksum, zio->io_abd, zio->io_size);

	return (zio);
	}

	static zio_t *
	zio_checksum_verify(zio_t *zio)
	{
	zio_bad_cksum_t info;
	blkptr_t *bp = zio->io_bp;
	int error;

	ASSERT(zio->io_vd != NULL);

	if (bp == NULL) {
	/*
	* This is zio_read_phys().
	* We're either verifying a label checksum, or nothing at all.
	*/
	if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF)
	return (zio);

	ASSERT3U(zio->io_prop.zp_checksum, ==, ZIO_CHECKSUM_LABEL);
	}

	if ((error = zio_checksum_error(zio, &info)) != 0) {
	zio->io_error = error;
	if (error == ECKSUM &&
	!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) {
	(void) zfs_ereport_start_checksum(zio->io_spa,
	zio->io_vd, &zio->io_bookmark, zio,
	zio->io_offset, zio->io_size, &info);
	mutex_enter(&zio->io_vd->vdev_stat_lock);
	zio->io_vd->vdev_stat.vs_checksum_errors++;
	mutex_exit(&zio->io_vd->vdev_stat_lock);
	}
	}

	return (zio);
	}

	/*
	* Called by RAID-Z to ensure we don't compute the checksum twice.
	*/
	void
	zio_checksum_verified(zio_t *zio)
	{
	zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY;
	}

	/*
	* ==========================================================================
	* Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other.
	* An error of 0 indicates success. ENXIO indicates whole-device failure,
	* which may be transient (e.g. unplugged) or permanent. ECKSUM and EIO
	* indicate errors that are specific to one I/O, and most likely permanent.
	* Any other error is presumed to be worse because we weren't expecting it.
	* ==========================================================================
	*/
	int
	zio_worst_error(int e1, int e2)
	{
	static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO };
	int r1, r2;

	for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++)
	if (e1 == zio_error_rank[r1])
	break;

	for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++)
	if (e2 == zio_error_rank[r2])
	break;

	return (r1 > r2 ? e1 : e2);
	}

	/*
	* ==========================================================================
	* I/O completion
	* ==========================================================================
	*/
	static zio_t *
	zio_ready(zio_t *zio)
	{
	blkptr_t *bp = zio->io_bp;
	zio_t pio, pio_next;
	zio_link_t *zl = NULL;

	if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT \| ZIO_CHILD_DDT_BIT,
	ZIO_WAIT_READY)) {
	return (NULL);
	}

	if (zio->io_ready) {
	ASSERT(IO_IS_ALLOCATING(zio));
	ASSERT(bp->blk_birth == zio->io_txg \|\| BP_IS_HOLE(bp) \|\|
	(zio->io_flags & ZIO_FLAG_NOPWRITE));
	ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0);

	zio->io_ready(zio);
	}

	if (bp != NULL && bp != &zio->io_bp_copy)
	zio->io_bp_copy = *bp;

	if (zio->io_error != 0) {
	zio->io_pipeline = ZIO_INTERLOCK_PIPELINE;

	if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
	ASSERT(IO_IS_ALLOCATING(zio));
	ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
	ASSERT(zio->io_metaslab_class != NULL);

	/*
	* We were unable to allocate anything, unreserve and
	* issue the next I/O to allocate.
	*/
	metaslab_class_throttle_unreserve(
	zio->io_metaslab_class, zio->io_prop.zp_copies,
	zio->io_allocator, zio);
	zio_allocate_dispatch(zio->io_spa, zio->io_allocator);
	}
	}

	mutex_enter(&zio->io_lock);
	zio->io_state[ZIO_WAIT_READY] = 1;
	pio = zio_walk_parents(zio, &zl);
	mutex_exit(&zio->io_lock);

	/*
	* As we notify zio's parents, new parents could be added.
	* New parents go to the head of zio's io_parent_list, however,
	* so we will (correctly) not notify them. The remainder of zio's
	* io_parent_list, from 'pio_next' onward, cannot change because
	* all parents must wait for us to be done before they can be done.
	*/
	for (; pio != NULL; pio = pio_next) {
	pio_next = zio_walk_parents(zio, &zl);
	zio_notify_parent(pio, zio, ZIO_WAIT_READY, NULL);
	}

	if (zio->io_flags & ZIO_FLAG_NODATA) {
	if (BP_IS_GANG(bp)) {
	zio->io_flags &= ~ZIO_FLAG_NODATA;
	} else {
	ASSERT((uintptr_t)zio->io_abd < SPA_MAXBLOCKSIZE);
	zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES;
	}
	}

	if (zio_injection_enabled &&
	zio->io_spa->spa_syncing_txg == zio->io_txg)
	zio_handle_ignored_writes(zio);

	return (zio);
	}

	/*
	* Update the allocation throttle accounting.
	*/
	static void
	zio_dva_throttle_done(zio_t *zio)
	{
	zio_t *lio __maybe_unused = zio->io_logical;
	zio_t *pio = zio_unique_parent(zio);
	vdev_t *vd = zio->io_vd;
	int flags = METASLAB_ASYNC_ALLOC;

	ASSERT3P(zio->io_bp, !=, NULL);
	ASSERT3U(zio->io_type, ==, ZIO_TYPE_WRITE);
	ASSERT3U(zio->io_priority, ==, ZIO_PRIORITY_ASYNC_WRITE);
	ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV);
	ASSERT(vd != NULL);
	ASSERT3P(vd, ==, vd->vdev_top);
	ASSERT(zio_injection_enabled \|\| !(zio->io_flags & ZIO_FLAG_IO_RETRY));
	ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REPAIR));
	ASSERT(zio->io_flags & ZIO_FLAG_IO_ALLOCATING);
	ASSERT(!(lio->io_flags & ZIO_FLAG_IO_REWRITE));
	ASSERT(!(lio->io_orig_flags & ZIO_FLAG_NODATA));

	/*
	* Parents of gang children can have two flavors -- ones that
	* allocated the gang header (will have ZIO_FLAG_IO_REWRITE set)
	* and ones that allocated the constituent blocks. The allocation
	* throttle needs to know the allocating parent zio so we must find
	* it here.
	*/
	if (pio->io_child_type == ZIO_CHILD_GANG) {
	/*
	* If our parent is a rewrite gang child then our grandparent
	* would have been the one that performed the allocation.
	*/
	if (pio->io_flags & ZIO_FLAG_IO_REWRITE)
	pio = zio_unique_parent(pio);
	flags \|= METASLAB_GANG_CHILD;
	}

	ASSERT(IO_IS_ALLOCATING(pio));
	ASSERT3P(zio, !=, zio->io_logical);
	ASSERT(zio->io_logical != NULL);
	ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REPAIR));
	ASSERT0(zio->io_flags & ZIO_FLAG_NOPWRITE);
	ASSERT(zio->io_metaslab_class != NULL);

	mutex_enter(&pio->io_lock);
	metaslab_group_alloc_decrement(zio->io_spa, vd->vdev_id, pio, flags,
	pio->io_allocator, B_TRUE);
	mutex_exit(&pio->io_lock);

	metaslab_class_throttle_unreserve(zio->io_metaslab_class, 1,
	pio->io_allocator, pio);

	/*
	* Call into the pipeline to see if there is more work that
	* needs to be done. If there is work to be done it will be
	* dispatched to another taskq thread.
	*/
	zio_allocate_dispatch(zio->io_spa, pio->io_allocator);
	}

	static zio_t *
	zio_done(zio_t *zio)
	{
	/*
	* Always attempt to keep stack usage minimal here since
	* we can be called recursively up to 19 levels deep.
	*/
	const uint64_t psize = zio->io_size;
	zio_t pio, pio_next;
	zio_link_t *zl = NULL;

	/*
	* If our children haven't all completed,
	* wait for them and then repeat this pipeline stage.
	*/
	if (zio_wait_for_children(zio, ZIO_CHILD_ALL_BITS, ZIO_WAIT_DONE)) {
	return (NULL);
	}

	/*
	* If the allocation throttle is enabled, then update the accounting.
	* We only track child I/Os that are part of an allocating async
	* write. We must do this since the allocation is performed
	* by the logical I/O but the actual write is done by child I/Os.
	*/
	if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING &&
	zio->io_child_type == ZIO_CHILD_VDEV) {
	ASSERT(zio->io_metaslab_class != NULL);
	ASSERT(zio->io_metaslab_class->mc_alloc_throttle_enabled);
	zio_dva_throttle_done(zio);
	}

	/*
	* If the allocation throttle is enabled, verify that
	* we have decremented the refcounts for every I/O that was throttled.
	*/
	if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
	ASSERT(zio->io_type == ZIO_TYPE_WRITE);
	ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
	ASSERT(zio->io_bp != NULL);

	metaslab_group_alloc_verify(zio->io_spa, zio->io_bp, zio,
	zio->io_allocator);
	VERIFY(zfs_refcount_not_held(&zio->io_metaslab_class->
	mc_allocator[zio->io_allocator].mca_alloc_slots, zio));
	}


	for (int c = 0; c < ZIO_CHILD_TYPES; c++)
	for (int w = 0; w < ZIO_WAIT_TYPES; w++)
	ASSERT(zio->io_children[c][w] == 0);

	if (zio->io_bp != NULL && !BP_IS_EMBEDDED(zio->io_bp)) {
	ASSERT(zio->io_bp->blk_pad[0] == 0);
	ASSERT(zio->io_bp->blk_pad[1] == 0);
	ASSERT(bcmp(zio->io_bp, &zio->io_bp_copy,
	sizeof (blkptr_t)) == 0 \|\|
	(zio->io_bp == zio_unique_parent(zio)->io_bp));
	if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(zio->io_bp) &&
	zio->io_bp_override == NULL &&
	!(zio->io_flags & ZIO_FLAG_IO_REPAIR)) {
	ASSERT3U(zio->io_prop.zp_copies, <=,
	BP_GET_NDVAS(zio->io_bp));
	ASSERT(BP_COUNT_GANG(zio->io_bp) == 0 \|\|
	(BP_COUNT_GANG(zio->io_bp) ==
	BP_GET_NDVAS(zio->io_bp)));
	}
	if (zio->io_flags & ZIO_FLAG_NOPWRITE)
	VERIFY(BP_EQUAL(zio->io_bp, &zio->io_bp_orig));
	}

	/*
	* If there were child vdev/gang/ddt errors, they apply to us now.
	*/
	zio_inherit_child_errors(zio, ZIO_CHILD_VDEV);
	zio_inherit_child_errors(zio, ZIO_CHILD_GANG);
	zio_inherit_child_errors(zio, ZIO_CHILD_DDT);

	/*
	* If the I/O on the transformed data was successful, generate any
	* checksum reports now while we still have the transformed data.
	*/
	if (zio->io_error == 0) {
	while (zio->io_cksum_report != NULL) {
	zio_cksum_report_t *zcr = zio->io_cksum_report;
	uint64_t align = zcr->zcr_align;
	uint64_t asize = P2ROUNDUP(psize, align);
	abd_t *adata = zio->io_abd;

	if (adata != NULL && asize != psize) {
	adata = abd_alloc(asize, B_TRUE);
	abd_copy(adata, zio->io_abd, psize);
	abd_zero_off(adata, psize, asize - psize);
	}

	zio->io_cksum_report = zcr->zcr_next;
	zcr->zcr_next = NULL;
	zcr->zcr_finish(zcr, adata);
	zfs_ereport_free_checksum(zcr);

	if (adata != NULL && asize != psize)
	abd_free(adata);
	}
	}

	zio_pop_transforms(zio); /* note: may set zio->io_error */

	vdev_stat_update(zio, psize);

	/*
	* If this I/O is attached to a particular vdev is slow, exceeding
	* 30 seconds to complete, post an error described the I/O delay.
	* We ignore these errors if the device is currently unavailable.
	*/
	if (zio->io_delay >= MSEC2NSEC(zio_slow_io_ms)) {
	if (zio->io_vd != NULL && !vdev_is_dead(zio->io_vd)) {
	/*
	* We want to only increment our slow IO counters if
	* the IO is valid (i.e. not if the drive is removed).
	*
	* zfs_ereport_post() will also do these checks, but
	* it can also ratelimit and have other failures, so we
	* need to increment the slow_io counters independent
	* of it.
	*/
	if (zfs_ereport_is_valid(FM_EREPORT_ZFS_DELAY,
	zio->io_spa, zio->io_vd, zio)) {
	mutex_enter(&zio->io_vd->vdev_stat_lock);
	zio->io_vd->vdev_stat.vs_slow_ios++;
	mutex_exit(&zio->io_vd->vdev_stat_lock);

	(void) zfs_ereport_post(FM_EREPORT_ZFS_DELAY,
	zio->io_spa, zio->io_vd, &zio->io_bookmark,
	zio, 0);
	}
	}
	}

	if (zio->io_error) {
	/*
	* If this I/O is attached to a particular vdev,
	* generate an error message describing the I/O failure
	* at the block level. We ignore these errors if the
	* device is currently unavailable.
	*/
	if (zio->io_error != ECKSUM && zio->io_vd != NULL &&
	!vdev_is_dead(zio->io_vd)) {
	int ret = zfs_ereport_post(FM_EREPORT_ZFS_IO,
	zio->io_spa, zio->io_vd, &zio->io_bookmark, zio, 0);
	if (ret != EALREADY) {
	mutex_enter(&zio->io_vd->vdev_stat_lock);
	if (zio->io_type == ZIO_TYPE_READ)
	zio->io_vd->vdev_stat.vs_read_errors++;
	else if (zio->io_type == ZIO_TYPE_WRITE)
	zio->io_vd->vdev_stat.vs_write_errors++;
	mutex_exit(&zio->io_vd->vdev_stat_lock);
	}
	}

	if ((zio->io_error == EIO \|\| !(zio->io_flags &
	(ZIO_FLAG_SPECULATIVE \| ZIO_FLAG_DONT_PROPAGATE))) &&
	zio == zio->io_logical) {
	/*
	* For logical I/O requests, tell the SPA to log the
	* error and generate a logical data ereport.
	*/
	spa_log_error(zio->io_spa, &zio->io_bookmark);
	(void) zfs_ereport_post(FM_EREPORT_ZFS_DATA,
	zio->io_spa, NULL, &zio->io_bookmark, zio, 0);
	}
	}

	if (zio->io_error && zio == zio->io_logical) {
	/*
	* Determine whether zio should be reexecuted. This will
	* propagate all the way to the root via zio_notify_parent().
	*/
	ASSERT(zio->io_vd == NULL && zio->io_bp != NULL);
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);

	if (IO_IS_ALLOCATING(zio) &&
	!(zio->io_flags & ZIO_FLAG_CANFAIL)) {
	if (zio->io_error != ENOSPC)
	zio->io_reexecute \|= ZIO_REEXECUTE_NOW;
	else
	zio->io_reexecute \|= ZIO_REEXECUTE_SUSPEND;
	}

	if ((zio->io_type == ZIO_TYPE_READ \|\|
	zio->io_type == ZIO_TYPE_FREE) &&
	!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) &&
	zio->io_error == ENXIO &&
	spa_load_state(zio->io_spa) == SPA_LOAD_NONE &&
	spa_get_failmode(zio->io_spa) != ZIO_FAILURE_MODE_CONTINUE)
	zio->io_reexecute \|= ZIO_REEXECUTE_SUSPEND;

	if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute)
	zio->io_reexecute \|= ZIO_REEXECUTE_SUSPEND;

	/*
	* Here is a possibly good place to attempt to do
	* either combinatorial reconstruction or error correction
	* based on checksums. It also might be a good place
	* to send out preliminary ereports before we suspend
	* processing.
	*/
	}

	/*
	* If there were logical child errors, they apply to us now.
	* We defer this until now to avoid conflating logical child
	* errors with errors that happened to the zio itself when
	* updating vdev stats and reporting FMA events above.
	*/
	zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL);

	if ((zio->io_error \|\| zio->io_reexecute) &&
	IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio &&
	!(zio->io_flags & (ZIO_FLAG_IO_REWRITE \| ZIO_FLAG_NOPWRITE)))
	zio_dva_unallocate(zio, zio->io_gang_tree, zio->io_bp);

	zio_gang_tree_free(&zio->io_gang_tree);

	/*
	* Godfather I/Os should never suspend.
	*/
	if ((zio->io_flags & ZIO_FLAG_GODFATHER) &&
	(zio->io_reexecute & ZIO_REEXECUTE_SUSPEND))
	zio->io_reexecute &= ~ZIO_REEXECUTE_SUSPEND;

	if (zio->io_reexecute) {
	/*
	* This is a logical I/O that wants to reexecute.
	*
	* Reexecute is top-down. When an i/o fails, if it's not
	* the root, it simply notifies its parent and sticks around.
	* The parent, seeing that it still has children in zio_done(),
	* does the same. This percolates all the way up to the root.
	* The root i/o will reexecute or suspend the entire tree.
	*
	* This approach ensures that zio_reexecute() honors
	* all the original i/o dependency relationships, e.g.
	* parents not executing until children are ready.
	*/
	ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);

	zio->io_gang_leader = NULL;

	mutex_enter(&zio->io_lock);
	zio->io_state[ZIO_WAIT_DONE] = 1;
	mutex_exit(&zio->io_lock);

	/*
	* "The Godfather" I/O monitors its children but is
	* not a true parent to them. It will track them through
	* the pipeline but severs its ties whenever they get into
	* trouble (e.g. suspended). This allows "The Godfather"
	* I/O to return status without blocking.
	*/
	zl = NULL;
	for (pio = zio_walk_parents(zio, &zl); pio != NULL;
	pio = pio_next) {
	zio_link_t *remove_zl = zl;
	pio_next = zio_walk_parents(zio, &zl);

	if ((pio->io_flags & ZIO_FLAG_GODFATHER) &&
	(zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) {
	zio_remove_child(pio, zio, remove_zl);
	/*
	* This is a rare code path, so we don't
	* bother with "next_to_execute".
	*/
	zio_notify_parent(pio, zio, ZIO_WAIT_DONE,
	NULL);
	}
	}

	if ((pio = zio_unique_parent(zio)) != NULL) {
	/*
	* We're not a root i/o, so there's nothing to do
	* but notify our parent. Don't propagate errors
	* upward since we haven't permanently failed yet.
	*/
	ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER));
	zio->io_flags \|= ZIO_FLAG_DONT_PROPAGATE;
	/*
	* This is a rare code path, so we don't bother with
	* "next_to_execute".
	*/
	zio_notify_parent(pio, zio, ZIO_WAIT_DONE, NULL);
	} else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) {
	/*
	* We'd fail again if we reexecuted now, so suspend
	* until conditions improve (e.g. device comes online).
	*/
	zio_suspend(zio->io_spa, zio, ZIO_SUSPEND_IOERR);
	} else {
	/*
	* Reexecution is potentially a huge amount of work.
	* Hand it off to the otherwise-unused claim taskq.
	*/
	ASSERT(taskq_empty_ent(&zio->io_tqent));
	spa_taskq_dispatch_ent(zio->io_spa,
	ZIO_TYPE_CLAIM, ZIO_TASKQ_ISSUE,
	- (task_func_t *)zio_reexecute, zio, 0,
	- &zio->io_tqent);
	+ zio_reexecute, zio, 0, &zio->io_tqent);
	}
	return (NULL);
	}

	ASSERT(zio->io_child_count == 0);
	ASSERT(zio->io_reexecute == 0);
	ASSERT(zio->io_error == 0 \|\| (zio->io_flags & ZIO_FLAG_CANFAIL));

	/*
	* Report any checksum errors, since the I/O is complete.
	*/
	while (zio->io_cksum_report != NULL) {
	zio_cksum_report_t *zcr = zio->io_cksum_report;
	zio->io_cksum_report = zcr->zcr_next;
	zcr->zcr_next = NULL;
	zcr->zcr_finish(zcr, NULL);
	zfs_ereport_free_checksum(zcr);
	}

	if (zio->io_flags & ZIO_FLAG_FASTWRITE && zio->io_bp &&
	!BP_IS_HOLE(zio->io_bp) && !BP_IS_EMBEDDED(zio->io_bp) &&
	!(zio->io_flags & ZIO_FLAG_NOPWRITE)) {
	metaslab_fastwrite_unmark(zio->io_spa, zio->io_bp);
	}

	/*
	* It is the responsibility of the done callback to ensure that this
	* particular zio is no longer discoverable for adoption, and as
	* such, cannot acquire any new parents.
	*/
	if (zio->io_done)
	zio->io_done(zio);

	mutex_enter(&zio->io_lock);
	zio->io_state[ZIO_WAIT_DONE] = 1;
	mutex_exit(&zio->io_lock);

	/*
	* We are done executing this zio. We may want to execute a parent
	* next. See the comment in zio_notify_parent().
	*/
	zio_t *next_to_execute = NULL;
	zl = NULL;
	for (pio = zio_walk_parents(zio, &zl); pio != NULL; pio = pio_next) {
	zio_link_t *remove_zl = zl;
	pio_next = zio_walk_parents(zio, &zl);
	zio_remove_child(pio, zio, remove_zl);
	zio_notify_parent(pio, zio, ZIO_WAIT_DONE, &next_to_execute);
	}

	if (zio->io_waiter != NULL) {
	mutex_enter(&zio->io_lock);
	zio->io_executor = NULL;
	cv_broadcast(&zio->io_cv);
	mutex_exit(&zio->io_lock);
	} else {
	zio_destroy(zio);
	}

	return (next_to_execute);
	}

	/*
	* ==========================================================================
	* I/O pipeline definition
	* ==========================================================================
	*/
	static zio_pipe_stage_t *zio_pipeline[] = {
	NULL,
	zio_read_bp_init,
	zio_write_bp_init,
	zio_free_bp_init,
	zio_issue_async,
	zio_write_compress,
	zio_encrypt,
	zio_checksum_generate,
	zio_nop_write,
	zio_ddt_read_start,
	zio_ddt_read_done,
	zio_ddt_write,
	zio_ddt_free,
	zio_gang_assemble,
	zio_gang_issue,
	zio_dva_throttle,
	zio_dva_allocate,
	zio_dva_free,
	zio_dva_claim,
	zio_ready,
	zio_vdev_io_start,
	zio_vdev_io_done,
	zio_vdev_io_assess,
	zio_checksum_verify,
	zio_done
	};




	/*
	* Compare two zbookmark_phys_t's to see which we would reach first in a
	* pre-order traversal of the object tree.
	*
	* This is simple in every case aside from the meta-dnode object. For all other
	* objects, we traverse them in order (object 1 before object 2, and so on).
	* However, all of these objects are traversed while traversing object 0, since
	* the data it points to is the list of objects. Thus, we need to convert to a
	* canonical representation so we can compare meta-dnode bookmarks to
	* non-meta-dnode bookmarks.
	*
	* We do this by calculating "equivalents" for each field of the zbookmark.
	* zbookmarks outside of the meta-dnode use their own object and level, and
	* calculate the level 0 equivalent (the first L0 blkid that is contained in the
	* blocks this bookmark refers to) by multiplying their blkid by their span
	* (the number of L0 blocks contained within one block at their level).
	* zbookmarks inside the meta-dnode calculate their object equivalent
	* (which is L0equiv * dnodes per data block), use 0 for their L0equiv, and use
	* level + 1<<31 (any value larger than a level could ever be) for their level.
	* This causes them to always compare before a bookmark in their object
	* equivalent, compare appropriately to bookmarks in other objects, and to
	* compare appropriately to other bookmarks in the meta-dnode.
	*/
	int
	zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, uint8_t ibs2,
	const zbookmark_phys_t zb1, const zbookmark_phys_t zb2)
	{
	/*
	* These variables represent the "equivalent" values for the zbookmark,
	* after converting zbookmarks inside the meta dnode to their
	* normal-object equivalents.
	*/
	uint64_t zb1obj, zb2obj;
	uint64_t zb1L0, zb2L0;
	uint64_t zb1level, zb2level;

	if (zb1->zb_object == zb2->zb_object &&
	zb1->zb_level == zb2->zb_level &&
	zb1->zb_blkid == zb2->zb_blkid)
	return (0);

	IMPLY(zb1->zb_level > 0, ibs1 >= SPA_MINBLOCKSHIFT);
	IMPLY(zb2->zb_level > 0, ibs2 >= SPA_MINBLOCKSHIFT);

	/*
	* BP_SPANB calculates the span in blocks.
	*/
	zb1L0 = (zb1->zb_blkid) * BP_SPANB(ibs1, zb1->zb_level);
	zb2L0 = (zb2->zb_blkid) * BP_SPANB(ibs2, zb2->zb_level);

	if (zb1->zb_object == DMU_META_DNODE_OBJECT) {
	zb1obj = zb1L0 * (dbss1 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT));
	zb1L0 = 0;
	zb1level = zb1->zb_level + COMPARE_META_LEVEL;
	} else {
	zb1obj = zb1->zb_object;
	zb1level = zb1->zb_level;
	}

	if (zb2->zb_object == DMU_META_DNODE_OBJECT) {
	zb2obj = zb2L0 * (dbss2 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT));
	zb2L0 = 0;
	zb2level = zb2->zb_level + COMPARE_META_LEVEL;
	} else {
	zb2obj = zb2->zb_object;
	zb2level = zb2->zb_level;
	}

	/* Now that we have a canonical representation, do the comparison. */
	if (zb1obj != zb2obj)
	return (zb1obj < zb2obj ? -1 : 1);
	else if (zb1L0 != zb2L0)
	return (zb1L0 < zb2L0 ? -1 : 1);
	else if (zb1level != zb2level)
	return (zb1level > zb2level ? -1 : 1);
	/*
	* This can (theoretically) happen if the bookmarks have the same object
	* and level, but different blkids, if the block sizes are not the same.
	* There is presently no way to change the indirect block sizes
	*/
	return (0);
	}

	/*
	* This function checks the following: given that last_block is the place that
	* our traversal stopped last time, does that guarantee that we've visited
	* every node under subtree_root? Therefore, we can't just use the raw output
	* of zbookmark_compare. We have to pass in a modified version of
	* subtree_root; by incrementing the block id, and then checking whether
	* last_block is before or equal to that, we can tell whether or not having
	* visited last_block implies that all of subtree_root's children have been
	* visited.
	*/
	boolean_t
	zbookmark_subtree_completed(const dnode_phys_t *dnp,
	const zbookmark_phys_t subtree_root, const zbookmark_phys_t last_block)
	{
	zbookmark_phys_t mod_zb = *subtree_root;
	mod_zb.zb_blkid++;
	ASSERT(last_block->zb_level == 0);

	/* The objset_phys_t isn't before anything. */
	if (dnp == NULL)
	return (B_FALSE);

	/*
	* We pass in 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT) for the
	* data block size in sectors, because that variable is only used if
	* the bookmark refers to a block in the meta-dnode. Since we don't
	* know without examining it what object it refers to, and there's no
	* harm in passing in this value in other cases, we always pass it in.
	*
	* We pass in 0 for the indirect block size shift because zb2 must be
	* level 0. The indirect block size is only used to calculate the span
	* of the bookmark, but since the bookmark must be level 0, the span is
	* always 1, so the math works out.
	*
	* If you make changes to how the zbookmark_compare code works, be sure
	* to make sure that this code still works afterwards.
	*/
	return (zbookmark_compare(dnp->dn_datablkszsec, dnp->dn_indblkshift,
	1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT), 0, &mod_zb,
	last_block) <= 0);
	}

	EXPORT_SYMBOL(zio_type_name);
	EXPORT_SYMBOL(zio_buf_alloc);
	EXPORT_SYMBOL(zio_data_buf_alloc);
	EXPORT_SYMBOL(zio_buf_free);
	EXPORT_SYMBOL(zio_data_buf_free);

	/* BEGIN CSTYLED */
	ZFS_MODULE_PARAM(zfs_zio, zio_, slow_io_ms, INT, ZMOD_RW,
	"Max I/O completion time (milliseconds) before marking it as slow");

	ZFS_MODULE_PARAM(zfs_zio, zio_, requeue_io_start_cut_in_line, INT, ZMOD_RW,
	"Prioritize requeued I/O");

	ZFS_MODULE_PARAM(zfs, zfs_, sync_pass_deferred_free, INT, ZMOD_RW,
	"Defer frees starting in this pass");

	ZFS_MODULE_PARAM(zfs, zfs_, sync_pass_dont_compress, INT, ZMOD_RW,
	"Don't compress starting in this pass");

	ZFS_MODULE_PARAM(zfs, zfs_, sync_pass_rewrite, INT, ZMOD_RW,
	"Rewrite new bps starting in this pass");

	ZFS_MODULE_PARAM(zfs_zio, zio_, dva_throttle_enabled, INT, ZMOD_RW,
	"Throttle block allocations in the ZIO pipeline");

	ZFS_MODULE_PARAM(zfs_zio, zio_, deadman_log_all, INT, ZMOD_RW,
	"Log all slow ZIOs, not just those with vdevs");
	/* END CSTYLED */
	diff --git a/sys/contrib/openzfs/module/zfs/zio_compress.c b/sys/contrib/openzfs/module/zfs/zio_compress.c
	index 2db3cec35d5d..33602bd471f3 100644
	--- a/sys/contrib/openzfs/module/zfs/zio_compress.c
	+++ b/sys/contrib/openzfs/module/zfs/zio_compress.c
	@@ -1,220 +1,220 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/
	/*
	* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
	*/

	/*
	* Copyright (c) 2013, 2018 by Delphix. All rights reserved.
	* Copyright (c) 2019, Klara Inc.
	* Copyright (c) 2019, Allan Jude
	*/

	#include <sys/zfs_context.h>
	#include <sys/spa.h>
	#include <sys/zfeature.h>
	#include <sys/zio.h>
	#include <sys/zio_compress.h>
	#include <sys/zstd/zstd.h>

	/*
	* If nonzero, every 1/X decompression attempts will fail, simulating
	* an undetected memory error.
	*/
	unsigned long zio_decompress_fail_fraction = 0;

	/*
	* Compression vectors.
	*/
	zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = {
	{"inherit", 0, NULL, NULL, NULL},
	{"on", 0, NULL, NULL, NULL},
	{"uncompressed", 0, NULL, NULL, NULL},
	{"lzjb", 0, lzjb_compress, lzjb_decompress, NULL},
	{"empty", 0, NULL, NULL, NULL},
	{"gzip-1", 1, gzip_compress, gzip_decompress, NULL},
	{"gzip-2", 2, gzip_compress, gzip_decompress, NULL},
	{"gzip-3", 3, gzip_compress, gzip_decompress, NULL},
	{"gzip-4", 4, gzip_compress, gzip_decompress, NULL},
	{"gzip-5", 5, gzip_compress, gzip_decompress, NULL},
	{"gzip-6", 6, gzip_compress, gzip_decompress, NULL},
	{"gzip-7", 7, gzip_compress, gzip_decompress, NULL},
	{"gzip-8", 8, gzip_compress, gzip_decompress, NULL},
	{"gzip-9", 9, gzip_compress, gzip_decompress, NULL},
	{"zle", 64, zle_compress, zle_decompress, NULL},
	{"lz4", 0, lz4_compress_zfs, lz4_decompress_zfs, NULL},
	{"zstd", ZIO_ZSTD_LEVEL_DEFAULT, zfs_zstd_compress,
	zfs_zstd_decompress, zfs_zstd_decompress_level},
	};

	uint8_t
	zio_complevel_select(spa_t *spa, enum zio_compress compress, uint8_t child,
	uint8_t parent)
	{
	uint8_t result;

	if (!ZIO_COMPRESS_HASLEVEL(compress))
	return (0);

	result = child;
	if (result == ZIO_COMPLEVEL_INHERIT)
	result = parent;

	return (result);
	}

	enum zio_compress
	zio_compress_select(spa_t *spa, enum zio_compress child,
	enum zio_compress parent)
	{
	enum zio_compress result;

	ASSERT(child < ZIO_COMPRESS_FUNCTIONS);
	ASSERT(parent < ZIO_COMPRESS_FUNCTIONS);
	ASSERT(parent != ZIO_COMPRESS_INHERIT);

	result = child;
	if (result == ZIO_COMPRESS_INHERIT)
	result = parent;

	if (result == ZIO_COMPRESS_ON) {
	if (spa_feature_is_active(spa, SPA_FEATURE_LZ4_COMPRESS))
	result = ZIO_COMPRESS_LZ4_ON_VALUE;
	else
	result = ZIO_COMPRESS_LEGACY_ON_VALUE;
	}

	return (result);
	}

	/ARGSUSED/
	static int
	zio_compress_zeroed_cb(void data, size_t len, void private)
	{
	uint64_t end = (uint64_t )((char *)data + len);
	for (uint64_t word = (uint64_t )data; word < end; word++)
	if (*word != 0)
	return (1);

	return (0);
	}

	size_t
	zio_compress_data(enum zio_compress c, abd_t src, void dst, size_t s_len,
	uint8_t level)
	{
	size_t c_len, d_len;
	uint8_t complevel;
	zio_compress_info_t *ci = &zio_compress_table[c];

	ASSERT((uint_t)c < ZIO_COMPRESS_FUNCTIONS);
	ASSERT((uint_t)c == ZIO_COMPRESS_EMPTY \|\| ci->ci_compress != NULL);

	/*
	* If the data is all zeroes, we don't even need to allocate
	* a block for it. We indicate this by returning zero size.
	*/
	if (abd_iterate_func(src, 0, s_len, zio_compress_zeroed_cb, NULL) == 0)
	return (0);

	if (c == ZIO_COMPRESS_EMPTY)
	return (s_len);

	/* Compress at least 12.5% */
	d_len = s_len - (s_len >> 3);

	complevel = ci->ci_level;

	if (c == ZIO_COMPRESS_ZSTD) {
	/* If we don't know the level, we can't compress it */
	if (level == ZIO_COMPLEVEL_INHERIT)
	return (s_len);

	if (level == ZIO_COMPLEVEL_DEFAULT)
	complevel = ZIO_ZSTD_LEVEL_DEFAULT;
	else
	complevel = level;

	ASSERT3U(complevel, !=, ZIO_COMPLEVEL_INHERIT);
	}

	/* No compression algorithms can read from ABDs directly */
	void *tmp = abd_borrow_buf_copy(src, s_len);
	c_len = ci->ci_compress(tmp, dst, s_len, d_len, complevel);
	abd_return_buf(src, tmp, s_len);

	if (c_len > d_len)
	return (s_len);

	ASSERT3U(c_len, <=, d_len);
	return (c_len);
	}

	int
	zio_decompress_data_buf(enum zio_compress c, void src, void dst,
	size_t s_len, size_t d_len, uint8_t *level)
	{
	zio_compress_info_t *ci = &zio_compress_table[c];
	if ((uint_t)c >= ZIO_COMPRESS_FUNCTIONS \|\| ci->ci_decompress == NULL)
	return (SET_ERROR(EINVAL));

	if (ci->ci_decompress_level != NULL && level != NULL)
	return (ci->ci_decompress_level(src, dst, s_len, d_len, level));

	return (ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level));
	}

	int
	zio_decompress_data(enum zio_compress c, abd_t src, void dst,
	size_t s_len, size_t d_len, uint8_t *level)
	{
	void *tmp = abd_borrow_buf_copy(src, s_len);
	int ret = zio_decompress_data_buf(c, tmp, dst, s_len, d_len, level);
	abd_return_buf(src, tmp, s_len);

	/*
	* Decompression shouldn't fail, because we've already verified
	* the checksum. However, for extra protection (e.g. against bitflips
	* in non-ECC RAM), we handle this error (and test it).
	*/
	if (zio_decompress_fail_fraction != 0 &&
	- spa_get_random(zio_decompress_fail_fraction) == 0)
	+ random_in_range(zio_decompress_fail_fraction) == 0)
	ret = SET_ERROR(EINVAL);

	return (ret);
	}

	int
	zio_compress_to_feature(enum zio_compress comp)
	{
	switch (comp) {
	case ZIO_COMPRESS_ZSTD:
	return (SPA_FEATURE_ZSTD_COMPRESS);
	default:
	/* fallthru */;
	}
	return (SPA_FEATURE_NONE);
	}
	diff --git a/sys/contrib/openzfs/module/zfs/zio_inject.c b/sys/contrib/openzfs/module/zfs/zio_inject.c
	index e56ea88682ff..feaf41dc65e3 100644
	--- a/sys/contrib/openzfs/module/zfs/zio_inject.c
	+++ b/sys/contrib/openzfs/module/zfs/zio_inject.c
	@@ -1,972 +1,972 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
	* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
	* Copyright (c) 2017, Intel Corporation.
	*/

	/*
	* ZFS fault injection
	*
	* To handle fault injection, we keep track of a series of zinject_record_t
	* structures which describe which logical block(s) should be injected with a
	* fault. These are kept in a global list. Each record corresponds to a given
	* spa_t and maintains a special hold on the spa_t so that it cannot be deleted
	* or exported while the injection record exists.
	*
	* Device level injection is done using the 'zi_guid' field. If this is set, it
	* means that the error is destined for a particular device, not a piece of
	* data.
	*
	* This is a rather poor data structure and algorithm, but we don't expect more
	* than a few faults at any one time, so it should be sufficient for our needs.
	*/

	#include <sys/arc.h>
	#include <sys/zio.h>
	#include <sys/zfs_ioctl.h>
	#include <sys/vdev_impl.h>
	#include <sys/dmu_objset.h>
	#include <sys/dsl_dataset.h>
	#include <sys/fs/zfs.h>

	uint32_t zio_injection_enabled = 0;

	/*
	* Data describing each zinject handler registered on the system, and
	* contains the list node linking the handler in the global zinject
	* handler list.
	*/
	typedef struct inject_handler {
	int zi_id;
	spa_t *zi_spa;
	zinject_record_t zi_record;
	uint64_t *zi_lanes;
	int zi_next_lane;
	list_node_t zi_link;
	} inject_handler_t;

	/*
	* List of all zinject handlers registered on the system, protected by
	* the inject_lock defined below.
	*/
	static list_t inject_handlers;

	/*
	* This protects insertion into, and traversal of, the inject handler
	* list defined above; as well as the inject_delay_count. Any time a
	* handler is inserted or removed from the list, this lock should be
	* taken as a RW_WRITER; and any time traversal is done over the list
	* (without modification to it) this lock should be taken as a RW_READER.
	*/
	static krwlock_t inject_lock;

	/*
	* This holds the number of zinject delay handlers that have been
	* registered on the system. It is protected by the inject_lock defined
	* above. Thus modifications to this count must be a RW_WRITER of the
	* inject_lock, and reads of this count must be (at least) a RW_READER
	* of the lock.
	*/
	static int inject_delay_count = 0;

	/*
	* This lock is used only in zio_handle_io_delay(), refer to the comment
	* in that function for more details.
	*/
	static kmutex_t inject_delay_mtx;

	/*
	* Used to assign unique identifying numbers to each new zinject handler.
	*/
	static int inject_next_id = 1;

	/*
	* Test if the requested frequency was triggered
	*/
	static boolean_t
	freq_triggered(uint32_t frequency)
	{
	/*
	* zero implies always (100%)
	*/
	if (frequency == 0)
	return (B_TRUE);

	/*
	* Note: we still handle legacy (unscaled) frequency values
	*/
	uint32_t maximum = (frequency <= 100) ? 100 : ZI_PERCENTAGE_MAX;

	- return (spa_get_random(maximum) < frequency);
	+ return (random_in_range(maximum) < frequency);
	}

	/*
	* Returns true if the given record matches the I/O in progress.
	*/
	static boolean_t
	zio_match_handler(const zbookmark_phys_t *zb, uint64_t type, int dva,
	zinject_record_t *record, int error)
	{
	/*
	* Check for a match against the MOS, which is based on type
	*/
	if (zb->zb_objset == DMU_META_OBJSET &&
	record->zi_objset == DMU_META_OBJSET &&
	record->zi_object == DMU_META_DNODE_OBJECT) {
	if (record->zi_type == DMU_OT_NONE \|\|
	type == record->zi_type)
	return (freq_triggered(record->zi_freq));
	else
	return (B_FALSE);
	}

	/*
	* Check for an exact match.
	*/
	if (zb->zb_objset == record->zi_objset &&
	zb->zb_object == record->zi_object &&
	zb->zb_level == record->zi_level &&
	zb->zb_blkid >= record->zi_start &&
	zb->zb_blkid <= record->zi_end &&
	(record->zi_dvas == 0 \|\| (record->zi_dvas & (1ULL << dva))) &&
	error == record->zi_error) {
	return (freq_triggered(record->zi_freq));
	}

	return (B_FALSE);
	}

	/*
	* Panic the system when a config change happens in the function
	* specified by tag.
	*/
	void
	zio_handle_panic_injection(spa_t spa, char tag, uint64_t type)
	{
	inject_handler_t *handler;

	rw_enter(&inject_lock, RW_READER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler)) {

	if (spa != handler->zi_spa)
	continue;

	if (handler->zi_record.zi_type == type &&
	strcmp(tag, handler->zi_record.zi_func) == 0)
	panic("Panic requested in function %s\n", tag);
	}

	rw_exit(&inject_lock);
	}

	/*
	* Inject a decryption failure. Decryption failures can occur in
	* both the ARC and the ZIO layers.
	*/
	int
	zio_handle_decrypt_injection(spa_t spa, const zbookmark_phys_t zb,
	uint64_t type, int error)
	{
	int ret = 0;
	inject_handler_t *handler;

	rw_enter(&inject_lock, RW_READER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler)) {

	if (spa != handler->zi_spa \|\|
	handler->zi_record.zi_cmd != ZINJECT_DECRYPT_FAULT)
	continue;

	if (zio_match_handler(zb, type, ZI_NO_DVA,
	&handler->zi_record, error)) {
	ret = error;
	break;
	}
	}

	rw_exit(&inject_lock);
	return (ret);
	}

	/*
	* If this is a physical I/O for a vdev child determine which DVA it is
	* for. We iterate backwards through the DVAs matching on the offset so
	* that we end up with ZI_NO_DVA (-1) if we don't find a match.
	*/
	static int
	zio_match_dva(zio_t *zio)
	{
	int i = ZI_NO_DVA;

	if (zio->io_bp != NULL && zio->io_vd != NULL &&
	zio->io_child_type == ZIO_CHILD_VDEV) {
	for (i = BP_GET_NDVAS(zio->io_bp) - 1; i >= 0; i--) {
	dva_t *dva = &zio->io_bp->blk_dva[i];
	uint64_t off = DVA_GET_OFFSET(dva);
	vdev_t *vd = vdev_lookup_top(zio->io_spa,
	DVA_GET_VDEV(dva));

	/* Compensate for vdev label added to leaves */
	if (zio->io_vd->vdev_ops->vdev_op_leaf)
	off += VDEV_LABEL_START_SIZE;

	if (zio->io_vd == vd && zio->io_offset == off)
	break;
	}
	}

	return (i);
	}


	/*
	* Determine if the I/O in question should return failure. Returns the errno
	* to be returned to the caller.
	*/
	int
	zio_handle_fault_injection(zio_t *zio, int error)
	{
	int ret = 0;
	inject_handler_t *handler;

	/*
	* Ignore I/O not associated with any logical data.
	*/
	if (zio->io_logical == NULL)
	return (0);

	/*
	* Currently, we only support fault injection on reads.
	*/
	if (zio->io_type != ZIO_TYPE_READ)
	return (0);

	/*
	* A rebuild I/O has no checksum to verify.
	*/
	if (zio->io_priority == ZIO_PRIORITY_REBUILD && error == ECKSUM)
	return (0);

	rw_enter(&inject_lock, RW_READER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler)) {
	if (zio->io_spa != handler->zi_spa \|\|
	handler->zi_record.zi_cmd != ZINJECT_DATA_FAULT)
	continue;

	/* If this handler matches, return the specified error */
	if (zio_match_handler(&zio->io_logical->io_bookmark,
	zio->io_bp ? BP_GET_TYPE(zio->io_bp) : DMU_OT_NONE,
	zio_match_dva(zio), &handler->zi_record, error)) {
	ret = error;
	break;
	}
	}

	rw_exit(&inject_lock);

	return (ret);
	}

	/*
	* Determine if the zio is part of a label update and has an injection
	* handler associated with that portion of the label. Currently, we
	* allow error injection in either the nvlist or the uberblock region of
	* of the vdev label.
	*/
	int
	zio_handle_label_injection(zio_t *zio, int error)
	{
	inject_handler_t *handler;
	vdev_t *vd = zio->io_vd;
	uint64_t offset = zio->io_offset;
	int label;
	int ret = 0;

	if (offset >= VDEV_LABEL_START_SIZE &&
	offset < vd->vdev_psize - VDEV_LABEL_END_SIZE)
	return (0);

	rw_enter(&inject_lock, RW_READER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler)) {
	uint64_t start = handler->zi_record.zi_start;
	uint64_t end = handler->zi_record.zi_end;

	if (handler->zi_record.zi_cmd != ZINJECT_LABEL_FAULT)
	continue;

	/*
	* The injection region is the relative offsets within a
	* vdev label. We must determine the label which is being
	* updated and adjust our region accordingly.
	*/
	label = vdev_label_number(vd->vdev_psize, offset);
	start = vdev_label_offset(vd->vdev_psize, label, start);
	end = vdev_label_offset(vd->vdev_psize, label, end);

	if (zio->io_vd->vdev_guid == handler->zi_record.zi_guid &&
	(offset >= start && offset <= end)) {
	ret = error;
	break;
	}
	}
	rw_exit(&inject_lock);
	return (ret);
	}

	/ARGSUSED/
	static int
	zio_inject_bitflip_cb(void data, size_t len, void private)
	{
	zio_t *zio __maybe_unused = private;
	uint8_t *buffer = data;
	- uint_t byte = spa_get_random(len);
	+ uint_t byte = random_in_range(len);

	ASSERT(zio->io_type == ZIO_TYPE_READ);

	/* flip a single random bit in an abd data buffer */
	- buffer[byte] ^= 1 << spa_get_random(8);
	+ buffer[byte] ^= 1 << random_in_range(8);

	return (1); /* stop after first flip */
	}

	static int
	zio_handle_device_injection_impl(vdev_t vd, zio_t zio, int err1, int err2)
	{
	inject_handler_t *handler;
	int ret = 0;

	/*
	* We skip over faults in the labels unless it's during
	* device open (i.e. zio == NULL).
	*/
	if (zio != NULL) {
	uint64_t offset = zio->io_offset;

	if (offset < VDEV_LABEL_START_SIZE \|\|
	offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE)
	return (0);
	}

	rw_enter(&inject_lock, RW_READER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler)) {

	if (handler->zi_record.zi_cmd != ZINJECT_DEVICE_FAULT)
	continue;

	if (vd->vdev_guid == handler->zi_record.zi_guid) {
	if (handler->zi_record.zi_failfast &&
	(zio == NULL \|\| (zio->io_flags &
	(ZIO_FLAG_IO_RETRY \| ZIO_FLAG_TRYHARD)))) {
	continue;
	}

	/* Handle type specific I/O failures */
	if (zio != NULL &&
	handler->zi_record.zi_iotype != ZIO_TYPES &&
	handler->zi_record.zi_iotype != zio->io_type)
	continue;

	if (handler->zi_record.zi_error == err1 \|\|
	handler->zi_record.zi_error == err2) {
	/*
	* limit error injection if requested
	*/
	if (!freq_triggered(handler->zi_record.zi_freq))
	continue;

	/*
	* For a failed open, pretend like the device
	* has gone away.
	*/
	if (err1 == ENXIO)
	vd->vdev_stat.vs_aux =
	VDEV_AUX_OPEN_FAILED;

	/*
	* Treat these errors as if they had been
	* retried so that all the appropriate stats
	* and FMA events are generated.
	*/
	if (!handler->zi_record.zi_failfast &&
	zio != NULL)
	zio->io_flags \|= ZIO_FLAG_IO_RETRY;

	/*
	* EILSEQ means flip a bit after a read
	*/
	if (handler->zi_record.zi_error == EILSEQ) {
	if (zio == NULL)
	break;

	/* locate buffer data and flip a bit */
	(void) abd_iterate_func(zio->io_abd, 0,
	zio->io_size, zio_inject_bitflip_cb,
	zio);
	break;
	}

	ret = handler->zi_record.zi_error;
	break;
	}
	if (handler->zi_record.zi_error == ENXIO) {
	ret = SET_ERROR(EIO);
	break;
	}
	}
	}

	rw_exit(&inject_lock);

	return (ret);
	}

	int
	zio_handle_device_injection(vdev_t vd, zio_t zio, int error)
	{
	return (zio_handle_device_injection_impl(vd, zio, error, INT_MAX));
	}

	int
	zio_handle_device_injections(vdev_t vd, zio_t zio, int err1, int err2)
	{
	return (zio_handle_device_injection_impl(vd, zio, err1, err2));
	}

	/*
	* Simulate hardware that ignores cache flushes. For requested number
	* of seconds nix the actual writing to disk.
	*/
	void
	zio_handle_ignored_writes(zio_t *zio)
	{
	inject_handler_t *handler;

	rw_enter(&inject_lock, RW_READER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler)) {

	/* Ignore errors not destined for this pool */
	if (zio->io_spa != handler->zi_spa \|\|
	handler->zi_record.zi_cmd != ZINJECT_IGNORED_WRITES)
	continue;

	/*
	* Positive duration implies # of seconds, negative
	* a number of txgs
	*/
	if (handler->zi_record.zi_timer == 0) {
	if (handler->zi_record.zi_duration > 0)
	handler->zi_record.zi_timer = ddi_get_lbolt64();
	else
	handler->zi_record.zi_timer = zio->io_txg;
	}

	/* Have a "problem" writing 60% of the time */
	- if (spa_get_random(100) < 60)
	+ if (random_in_range(100) < 60)
	zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES;
	break;
	}

	rw_exit(&inject_lock);
	}

	void
	spa_handle_ignored_writes(spa_t *spa)
	{
	inject_handler_t *handler;

	if (zio_injection_enabled == 0)
	return;

	rw_enter(&inject_lock, RW_READER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler)) {

	if (spa != handler->zi_spa \|\|
	handler->zi_record.zi_cmd != ZINJECT_IGNORED_WRITES)
	continue;

	if (handler->zi_record.zi_duration > 0) {
	VERIFY(handler->zi_record.zi_timer == 0 \|\|
	ddi_time_after64(
	(int64_t)handler->zi_record.zi_timer +
	handler->zi_record.zi_duration * hz,
	ddi_get_lbolt64()));
	} else {
	/* duration is negative so the subtraction here adds */
	VERIFY(handler->zi_record.zi_timer == 0 \|\|
	handler->zi_record.zi_timer -
	handler->zi_record.zi_duration >=
	spa_syncing_txg(spa));
	}
	}

	rw_exit(&inject_lock);
	}

	hrtime_t
	zio_handle_io_delay(zio_t *zio)
	{
	vdev_t *vd = zio->io_vd;
	inject_handler_t *min_handler = NULL;
	hrtime_t min_target = 0;

	rw_enter(&inject_lock, RW_READER);

	/*
	* inject_delay_count is a subset of zio_injection_enabled that
	* is only incremented for delay handlers. These checks are
	* mainly added to remind the reader why we're not explicitly
	* checking zio_injection_enabled like the other functions.
	*/
	IMPLY(inject_delay_count > 0, zio_injection_enabled > 0);
	IMPLY(zio_injection_enabled == 0, inject_delay_count == 0);

	/*
	* If there aren't any inject delay handlers registered, then we
	* can short circuit and simply return 0 here. A value of zero
	* informs zio_delay_interrupt() that this request should not be
	* delayed. This short circuit keeps us from acquiring the
	* inject_delay_mutex unnecessarily.
	*/
	if (inject_delay_count == 0) {
	rw_exit(&inject_lock);
	return (0);
	}

	/*
	* Each inject handler has a number of "lanes" associated with
	* it. Each lane is able to handle requests independently of one
	* another, and at a latency defined by the inject handler
	* record's zi_timer field. Thus if a handler in configured with
	* a single lane with a 10ms latency, it will delay requests
	* such that only a single request is completed every 10ms. So,
	* if more than one request is attempted per each 10ms interval,
	* the average latency of the requests will be greater than
	* 10ms; but if only a single request is submitted each 10ms
	* interval the average latency will be 10ms.
	*
	* We need to acquire this mutex to prevent multiple concurrent
	* threads being assigned to the same lane of a given inject
	* handler. The mutex allows us to perform the following two
	* operations atomically:
	*
	* 1. determine the minimum handler and minimum target
	* value of all the possible handlers
	* 2. update that minimum handler's lane array
	*
	* Without atomicity, two (or more) threads could pick the same
	* lane in step (1), and then conflict with each other in step
	* (2). This could allow a single lane handler to process
	* multiple requests simultaneously, which shouldn't be possible.
	*/
	mutex_enter(&inject_delay_mtx);

	for (inject_handler_t *handler = list_head(&inject_handlers);
	handler != NULL; handler = list_next(&inject_handlers, handler)) {
	if (handler->zi_record.zi_cmd != ZINJECT_DELAY_IO)
	continue;

	if (!freq_triggered(handler->zi_record.zi_freq))
	continue;

	if (vd->vdev_guid != handler->zi_record.zi_guid)
	continue;

	/*
	* Defensive; should never happen as the array allocation
	* occurs prior to inserting this handler on the list.
	*/
	ASSERT3P(handler->zi_lanes, !=, NULL);

	/*
	* This should never happen, the zinject command should
	* prevent a user from setting an IO delay with zero lanes.
	*/
	ASSERT3U(handler->zi_record.zi_nlanes, !=, 0);

	ASSERT3U(handler->zi_record.zi_nlanes, >,
	handler->zi_next_lane);

	/*
	* We want to issue this IO to the lane that will become
	* idle the soonest, so we compare the soonest this
	* specific handler can complete the IO with all other
	* handlers, to find the lowest value of all possible
	* lanes. We then use this lane to submit the request.
	*
	* Since each handler has a constant value for its
	* delay, we can just use the "next" lane for that
	* handler; as it will always be the lane with the
	* lowest value for that particular handler (i.e. the
	* lane that will become idle the soonest). This saves a
	* scan of each handler's lanes array.
	*
	* There's two cases to consider when determining when
	* this specific IO request should complete. If this
	* lane is idle, we want to "submit" the request now so
	* it will complete after zi_timer milliseconds. Thus,
	* we set the target to now + zi_timer.
	*
	* If the lane is busy, we want this request to complete
	* zi_timer milliseconds after the lane becomes idle.
	* Since the 'zi_lanes' array holds the time at which
	* each lane will become idle, we use that value to
	* determine when this request should complete.
	*/
	hrtime_t idle = handler->zi_record.zi_timer + gethrtime();
	hrtime_t busy = handler->zi_record.zi_timer +
	handler->zi_lanes[handler->zi_next_lane];
	hrtime_t target = MAX(idle, busy);

	if (min_handler == NULL) {
	min_handler = handler;
	min_target = target;
	continue;
	}

	ASSERT3P(min_handler, !=, NULL);
	ASSERT3U(min_target, !=, 0);

	/*
	* We don't yet increment the "next lane" variable since
	* we still might find a lower value lane in another
	* handler during any remaining iterations. Once we're
	* sure we've selected the absolute minimum, we'll claim
	* the lane and increment the handler's "next lane"
	* field below.
	*/

	if (target < min_target) {
	min_handler = handler;
	min_target = target;
	}
	}

	/*
	* 'min_handler' will be NULL if no IO delays are registered for
	* this vdev, otherwise it will point to the handler containing
	* the lane that will become idle the soonest.
	*/
	if (min_handler != NULL) {
	ASSERT3U(min_target, !=, 0);
	min_handler->zi_lanes[min_handler->zi_next_lane] = min_target;

	/*
	* If we've used all possible lanes for this handler,
	* loop back and start using the first lane again;
	* otherwise, just increment the lane index.
	*/
	min_handler->zi_next_lane = (min_handler->zi_next_lane + 1) %
	min_handler->zi_record.zi_nlanes;
	}

	mutex_exit(&inject_delay_mtx);
	rw_exit(&inject_lock);

	return (min_target);
	}

	static int
	zio_calculate_range(const char pool, zinject_record_t record)
	{
	dsl_pool_t *dp;
	dsl_dataset_t *ds;
	objset_t *os = NULL;
	dnode_t *dn = NULL;
	int error;

	/*
	* Obtain the dnode for object using pool, objset, and object
	*/
	error = dsl_pool_hold(pool, FTAG, &dp);
	if (error)
	return (error);

	error = dsl_dataset_hold_obj(dp, record->zi_objset, FTAG, &ds);
	dsl_pool_rele(dp, FTAG);
	if (error)
	return (error);

	error = dmu_objset_from_ds(ds, &os);
	dsl_dataset_rele(ds, FTAG);
	if (error)
	return (error);

	error = dnode_hold(os, record->zi_object, FTAG, &dn);
	if (error)
	return (error);

	/*
	* Translate the range into block IDs
	*/
	if (record->zi_start != 0 \|\| record->zi_end != -1ULL) {
	record->zi_start >>= dn->dn_datablkshift;
	record->zi_end >>= dn->dn_datablkshift;
	}
	if (record->zi_level > 0) {
	if (record->zi_level >= dn->dn_nlevels) {
	dnode_rele(dn, FTAG);
	return (SET_ERROR(EDOM));
	}

	if (record->zi_start != 0 \|\| record->zi_end != 0) {
	int shift = dn->dn_indblkshift - SPA_BLKPTRSHIFT;

	for (int level = record->zi_level; level > 0; level--) {
	record->zi_start >>= shift;
	record->zi_end >>= shift;
	}
	}
	}

	dnode_rele(dn, FTAG);
	return (0);
	}

	/*
	* Create a new handler for the given record. We add it to the list, adding
	* a reference to the spa_t in the process. We increment zio_injection_enabled,
	* which is the switch to trigger all fault injection.
	*/
	int
	zio_inject_fault(char name, int flags, int id, zinject_record_t *record)
	{
	inject_handler_t *handler;
	int error;
	spa_t *spa;

	/*
	* If this is pool-wide metadata, make sure we unload the corresponding
	* spa_t, so that the next attempt to load it will trigger the fault.
	* We call spa_reset() to unload the pool appropriately.
	*/
	if (flags & ZINJECT_UNLOAD_SPA)
	if ((error = spa_reset(name)) != 0)
	return (error);

	if (record->zi_cmd == ZINJECT_DELAY_IO) {
	/*
	* A value of zero for the number of lanes or for the
	* delay time doesn't make sense.
	*/
	if (record->zi_timer == 0 \|\| record->zi_nlanes == 0)
	return (SET_ERROR(EINVAL));

	/*
	* The number of lanes is directly mapped to the size of
	* an array used by the handler. Thus, to ensure the
	* user doesn't trigger an allocation that's "too large"
	* we cap the number of lanes here.
	*/
	if (record->zi_nlanes >= UINT16_MAX)
	return (SET_ERROR(EINVAL));
	}

	/*
	* If the supplied range was in bytes -- calculate the actual blkid
	*/
	if (flags & ZINJECT_CALC_RANGE) {
	error = zio_calculate_range(name, record);
	if (error != 0)
	return (error);
	}

	if (!(flags & ZINJECT_NULL)) {
	/*
	* spa_inject_ref() will add an injection reference, which will
	* prevent the pool from being removed from the namespace while
	* still allowing it to be unloaded.
	*/
	if ((spa = spa_inject_addref(name)) == NULL)
	return (SET_ERROR(ENOENT));

	handler = kmem_alloc(sizeof (inject_handler_t), KM_SLEEP);

	handler->zi_spa = spa;
	handler->zi_record = *record;

	if (handler->zi_record.zi_cmd == ZINJECT_DELAY_IO) {
	handler->zi_lanes = kmem_zalloc(
	sizeof (handler->zi_lanes)
	handler->zi_record.zi_nlanes, KM_SLEEP);
	handler->zi_next_lane = 0;
	} else {
	handler->zi_lanes = NULL;
	handler->zi_next_lane = 0;
	}

	rw_enter(&inject_lock, RW_WRITER);

	/*
	* We can't move this increment into the conditional
	* above because we need to hold the RW_WRITER lock of
	* inject_lock, and we don't want to hold that while
	* allocating the handler's zi_lanes array.
	*/
	if (handler->zi_record.zi_cmd == ZINJECT_DELAY_IO) {
	ASSERT3S(inject_delay_count, >=, 0);
	inject_delay_count++;
	ASSERT3S(inject_delay_count, >, 0);
	}

	*id = handler->zi_id = inject_next_id++;
	list_insert_tail(&inject_handlers, handler);
	atomic_inc_32(&zio_injection_enabled);

	rw_exit(&inject_lock);
	}

	/*
	* Flush the ARC, so that any attempts to read this data will end up
	* going to the ZIO layer. Note that this is a little overkill, but
	* we don't have the necessary ARC interfaces to do anything else, and
	* fault injection isn't a performance critical path.
	*/
	if (flags & ZINJECT_FLUSH_ARC)
	/*
	* We must use FALSE to ensure arc_flush returns, since
	* we're not preventing concurrent ARC insertions.
	*/
	arc_flush(NULL, FALSE);

	return (0);
	}

	/*
	* Returns the next record with an ID greater than that supplied to the
	* function. Used to iterate over all handlers in the system.
	*/
	int
	zio_inject_list_next(int id, char name, size_t buflen,
	zinject_record_t *record)
	{
	inject_handler_t *handler;
	int ret;

	mutex_enter(&spa_namespace_lock);
	rw_enter(&inject_lock, RW_READER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler))
	if (handler->zi_id > *id)
	break;

	if (handler) {
	*record = handler->zi_record;
	*id = handler->zi_id;
	(void) strncpy(name, spa_name(handler->zi_spa), buflen);
	ret = 0;
	} else {
	ret = SET_ERROR(ENOENT);
	}

	rw_exit(&inject_lock);
	mutex_exit(&spa_namespace_lock);

	return (ret);
	}

	/*
	* Clear the fault handler with the given identifier, or return ENOENT if none
	* exists.
	*/
	int
	zio_clear_fault(int id)
	{
	inject_handler_t *handler;

	rw_enter(&inject_lock, RW_WRITER);

	for (handler = list_head(&inject_handlers); handler != NULL;
	handler = list_next(&inject_handlers, handler))
	if (handler->zi_id == id)
	break;

	if (handler == NULL) {
	rw_exit(&inject_lock);
	return (SET_ERROR(ENOENT));
	}

	if (handler->zi_record.zi_cmd == ZINJECT_DELAY_IO) {
	ASSERT3S(inject_delay_count, >, 0);
	inject_delay_count--;
	ASSERT3S(inject_delay_count, >=, 0);
	}

	list_remove(&inject_handlers, handler);
	rw_exit(&inject_lock);

	if (handler->zi_record.zi_cmd == ZINJECT_DELAY_IO) {
	ASSERT3P(handler->zi_lanes, !=, NULL);
	kmem_free(handler->zi_lanes, sizeof (handler->zi_lanes)
	handler->zi_record.zi_nlanes);
	} else {
	ASSERT3P(handler->zi_lanes, ==, NULL);
	}

	spa_inject_delref(handler->zi_spa);
	kmem_free(handler, sizeof (inject_handler_t));
	atomic_dec_32(&zio_injection_enabled);

	return (0);
	}

	void
	zio_inject_init(void)
	{
	rw_init(&inject_lock, NULL, RW_DEFAULT, NULL);
	mutex_init(&inject_delay_mtx, NULL, MUTEX_DEFAULT, NULL);
	list_create(&inject_handlers, sizeof (inject_handler_t),
	offsetof(inject_handler_t, zi_link));
	}

	void
	zio_inject_fini(void)
	{
	list_destroy(&inject_handlers);
	mutex_destroy(&inject_delay_mtx);
	rw_destroy(&inject_lock);
	}

	#if defined(_KERNEL)
	EXPORT_SYMBOL(zio_injection_enabled);
	EXPORT_SYMBOL(zio_inject_fault);
	EXPORT_SYMBOL(zio_inject_list_next);
	EXPORT_SYMBOL(zio_clear_fault);
	EXPORT_SYMBOL(zio_handle_fault_injection);
	EXPORT_SYMBOL(zio_handle_device_injection);
	EXPORT_SYMBOL(zio_handle_label_injection);
	#endif
	diff --git a/sys/contrib/openzfs/module/zfs/zthr.c b/sys/contrib/openzfs/module/zfs/zthr.c
	index 5ac2e30467e3..33fdda7b68d1 100644
	--- a/sys/contrib/openzfs/module/zfs/zthr.c
	+++ b/sys/contrib/openzfs/module/zfs/zthr.c
	@@ -1,536 +1,541 @@
	/*
	* CDDL HEADER START
	*
	* This file and its contents are supplied under the terms of the
	* Common Development and Distribution License ("CDDL"), version 1.0.
	* You may only use this file in accordance with the terms of version
	* 1.0 of the CDDL.
	*
	* A full copy of the text of the CDDL should have accompanied this
	* source. A copy of the CDDL is also available via the Internet at
	* http://www.illumos.org/license/CDDL.
	*
	* CDDL HEADER END
	*/

	/*
	* Copyright (c) 2017, 2020 by Delphix. All rights reserved.
	*/

	/*
	* ZTHR Infrastructure
	* ===================
	*
	* ZTHR threads are used for isolated operations that span multiple txgs
	* within a SPA. They generally exist from SPA creation/loading and until
	* the SPA is exported/destroyed. The ideal requirements for an operation
	* to be modeled with a zthr are the following:
	*
	* 1] The operation needs to run over multiple txgs.
	* 2] There is be a single point of reference in memory or on disk that
	* indicates whether the operation should run/is running or has
	* stopped.
	*
	* If the operation satisfies the above then the following rules guarantee
	* a certain level of correctness:
	*
	* 1] Any thread EXCEPT the zthr changes the work indicator from stopped
	* to running but not the opposite.
	* 2] Only the zthr can change the work indicator from running to stopped
	* (e.g. when it is done) but not the opposite.
	*
	* This way a normal zthr cycle should go like this:
	*
	* 1] An external thread changes the work indicator from stopped to
	* running and wakes up the zthr.
	* 2] The zthr wakes up, checks the indicator and starts working.
	* 3] When the zthr is done, it changes the indicator to stopped, allowing
	* a new cycle to start.
	*
	* Besides being awakened by other threads, a zthr can be configured
	* during creation to wakeup on its own after a specified interval
	* [see zthr_create_timer()].
	*
	* Note: ZTHR threads are NOT a replacement for generic threads! Please
	* ensure that they fit your use-case well before using them.
	*
	* == ZTHR creation
	*
	* Every zthr needs four inputs to start running:
	*
	* 1] A user-defined checker function (checkfunc) that decides whether
	* the zthr should start working or go to sleep. The function should
	* return TRUE when the zthr needs to work or FALSE to let it sleep,
	* and should adhere to the following signature:
	* boolean_t checkfunc_name(void args, zthr_t t);
	*
	* 2] A user-defined ZTHR function (func) which the zthr executes when
	* it is not sleeping. The function should adhere to the following
	* signature type:
	* void func_name(void args, zthr_t t);
	*
	* 3] A void args pointer that will be passed to checkfunc and func
	* implicitly by the infrastructure.
	*
	* 4] A name for the thread. This string must be valid for the lifetime
	* of the zthr.
	*
	* The reason why the above API needs two different functions,
	* instead of one that both checks and does the work, has to do with
	* the zthr's internal state lock (zthr_state_lock) and the allowed
	* cancellation windows. We want to hold the zthr_state_lock while
	* running checkfunc but not while running func. This way the zthr
	* can be cancelled while doing work and not while checking for work.
	*
	* To start a zthr:
	- * zthr_t *zthr_pointer = zthr_create(checkfunc, func, args);
	+ * zthr_t *zthr_pointer = zthr_create(checkfunc, func, args,
	+ * pri);
	* or
	* zthr_t *zthr_pointer = zthr_create_timer(checkfunc, func,
	- * args, max_sleep);
	+ * args, max_sleep, pri);
	*
	* After that you should be able to wakeup, cancel, and resume the
	* zthr from another thread using the zthr_pointer.
	*
	* NOTE: ZTHR threads could potentially wake up spuriously and the
	* user should take this into account when writing a checkfunc.
	* [see ZTHR state transitions]
	*
	* == ZTHR wakeup
	*
	* ZTHR wakeup should be used when new work is added for the zthr. The
	* sleeping zthr will wakeup, see that it has more work to complete
	* and proceed. This can be invoked from open or syncing context.
	*
	* To wakeup a zthr:
	* zthr_wakeup(zthr_t *t)
	*
	* == ZTHR cancellation and resumption
	*
	* ZTHR threads must be cancelled when their SPA is being exported
	* or when they need to be paused so they don't interfere with other
	* operations.
	*
	* To cancel a zthr:
	* zthr_cancel(zthr_pointer);
	*
	* To resume it:
	* zthr_resume(zthr_pointer);
	*
	* ZTHR cancel and resume should be invoked in open context during the
	* lifecycle of the pool as it is imported, exported or destroyed.
	*
	* A zthr will implicitly check if it has received a cancellation
	* signal every time func returns and every time it wakes up [see
	* ZTHR state transitions below].
	*
	* At times, waiting for the zthr's func to finish its job may take
	* time. This may be very time-consuming for some operations that
	* need to cancel the SPA's zthrs (e.g spa_export). For this scenario
	* the user can explicitly make their ZTHR function aware of incoming
	* cancellation signals using zthr_iscancelled(). A common pattern for
	* that looks like this:
	*
	* int
	* func_name(void args, zthr_t t)
	* {
	* ... <unpack args> ...
	* while (!work_done && !zthr_iscancelled(t)) {
	* ... <do more work> ...
	* }
	* }
	*
	* == ZTHR cleanup
	*
	* Cancelling a zthr doesn't clean up its metadata (internal locks,
	* function pointers to func and checkfunc, etc..). This is because
	* we want to keep them around in case we want to resume the execution
	* of the zthr later. Similarly for zthrs that exit themselves.
	*
	* To completely cleanup a zthr, cancel it first to ensure that it
	* is not running and then use zthr_destroy().
	*
	* == ZTHR state transitions
	*
	* zthr creation
	* +
	* \|
	* \| woke up
	* \| +--------------+ sleep
	* \| \| ^
	* \| \| \|
	* \| \| \| FALSE
	* \| \| \|
	* v v FALSE +
	* cancelled? +---------> checkfunc?
	* + ^ +
	* \| \| \|
	* \| \| \| TRUE
	* \| \| \|
	* \| \| func returned v
	* \| +---------------+ func
	* \|
	* \| TRUE
	* \|
	* v
	* zthr stopped running
	*
	* == Implementation of ZTHR requests
	*
	* ZTHR cancel and resume are requests on a zthr to change its
	* internal state. These requests are serialized using the
	* zthr_request_lock, while changes in its internal state are
	* protected by the zthr_state_lock. A request will first acquire
	* the zthr_request_lock and then immediately acquire the
	* zthr_state_lock. We do this so that incoming requests are
	* serialized using the request lock, while still allowing us
	* to use the state lock for thread communication via zthr_cv.
	*
	* ZTHR wakeup broadcasts to zthr_cv, causing sleeping threads
	* to wakeup. It acquires the zthr_state_lock but not the
	* zthr_request_lock, so that a wakeup on a zthr in the middle
	* of being cancelled will not block.
	*/

	#include <sys/zfs_context.h>
	#include <sys/zthr.h>

	struct zthr {
	/* running thread doing the work */
	kthread_t *zthr_thread;

	/* lock protecting internal data & invariants */
	kmutex_t zthr_state_lock;

	/* mutex that serializes external requests */
	kmutex_t zthr_request_lock;

	/* notification mechanism for requests */
	kcondvar_t zthr_cv;

	/* flag set to true if we are canceling the zthr */
	boolean_t zthr_cancel;

	/* flag set to true if we are waiting for the zthr to finish */
	boolean_t zthr_haswaiters;
	kcondvar_t zthr_wait_cv;
	/*
	* maximum amount of time that the zthr is spent sleeping;
	* if this is 0, the thread doesn't wake up until it gets
	* signaled.
	*/
	hrtime_t zthr_sleep_timeout;

	+ /* Thread priority */
	+ pri_t zthr_pri;
	+
	/* consumer-provided callbacks & data */
	zthr_checkfunc_t *zthr_checkfunc;
	zthr_func_t *zthr_func;
	void *zthr_arg;
	const char *zthr_name;
	};

	static void
	zthr_procedure(void *arg)
	{
	zthr_t *t = arg;

	mutex_enter(&t->zthr_state_lock);
	ASSERT3P(t->zthr_thread, ==, curthread);

	while (!t->zthr_cancel) {
	if (t->zthr_checkfunc(t->zthr_arg, t)) {
	mutex_exit(&t->zthr_state_lock);
	t->zthr_func(t->zthr_arg, t);
	mutex_enter(&t->zthr_state_lock);
	} else {
	if (t->zthr_sleep_timeout == 0) {
	cv_wait_idle(&t->zthr_cv, &t->zthr_state_lock);
	} else {
	(void) cv_timedwait_idle_hires(&t->zthr_cv,
	&t->zthr_state_lock, t->zthr_sleep_timeout,
	MSEC2NSEC(1), 0);
	}
	}
	if (t->zthr_haswaiters) {
	t->zthr_haswaiters = B_FALSE;
	cv_broadcast(&t->zthr_wait_cv);
	}
	}

	/*
	* Clear out the kernel thread metadata and notify the
	* zthr_cancel() thread that we've stopped running.
	*/
	t->zthr_thread = NULL;
	t->zthr_cancel = B_FALSE;
	cv_broadcast(&t->zthr_cv);

	mutex_exit(&t->zthr_state_lock);
	thread_exit();
	}

	zthr_t *
	zthr_create(const char zthr_name, zthr_checkfunc_t checkfunc,
	- zthr_func_t func, void arg)
	+ zthr_func_t func, void arg, pri_t pri)
	{
	return (zthr_create_timer(zthr_name, checkfunc,
	- func, arg, (hrtime_t)0));
	+ func, arg, (hrtime_t)0, pri));
	}

	/*
	* Create a zthr with specified maximum sleep time. If the time
	* in sleeping state exceeds max_sleep, a wakeup(do the check and
	* start working if required) will be triggered.
	*/
	zthr_t *
	zthr_create_timer(const char zthr_name, zthr_checkfunc_t checkfunc,
	- zthr_func_t func, void arg, hrtime_t max_sleep)
	+ zthr_func_t func, void arg, hrtime_t max_sleep, pri_t pri)
	{
	zthr_t t = kmem_zalloc(sizeof (t), KM_SLEEP);
	mutex_init(&t->zthr_state_lock, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&t->zthr_request_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&t->zthr_cv, NULL, CV_DEFAULT, NULL);
	cv_init(&t->zthr_wait_cv, NULL, CV_DEFAULT, NULL);

	mutex_enter(&t->zthr_state_lock);
	t->zthr_checkfunc = checkfunc;
	t->zthr_func = func;
	t->zthr_arg = arg;
	t->zthr_sleep_timeout = max_sleep;
	t->zthr_name = zthr_name;
	+ t->zthr_pri = pri;

	t->zthr_thread = thread_create_named(zthr_name, NULL, 0,
	- zthr_procedure, t, 0, &p0, TS_RUN, minclsyspri);
	+ zthr_procedure, t, 0, &p0, TS_RUN, pri);

	mutex_exit(&t->zthr_state_lock);

	return (t);
	}

	void
	zthr_destroy(zthr_t *t)
	{
	ASSERT(!MUTEX_HELD(&t->zthr_state_lock));
	ASSERT(!MUTEX_HELD(&t->zthr_request_lock));
	VERIFY3P(t->zthr_thread, ==, NULL);
	mutex_destroy(&t->zthr_request_lock);
	mutex_destroy(&t->zthr_state_lock);
	cv_destroy(&t->zthr_cv);
	cv_destroy(&t->zthr_wait_cv);
	kmem_free(t, sizeof (*t));
	}

	/*
	* Wake up the zthr if it is sleeping. If the thread has been cancelled
	* or is in the process of being cancelled, this is a no-op.
	*/
	void
	zthr_wakeup(zthr_t *t)
	{
	mutex_enter(&t->zthr_state_lock);

	/*
	* There are 5 states that we can find the zthr when issuing
	* this broadcast:
	*
	* [1] The common case of the thread being asleep, at which
	* point the broadcast will wake it up.
	* [2] The thread has been cancelled. Waking up a cancelled
	* thread is a no-op. Any work that is still left to be
	* done should be handled the next time the thread is
	* resumed.
	* [3] The thread is doing work and is already up, so this
	* is basically a no-op.
	* [4] The thread was just created/resumed, in which case the
	* behavior is similar to [3].
	* [5] The thread is in the middle of being cancelled, which
	* will be a no-op.
	*/
	cv_broadcast(&t->zthr_cv);

	mutex_exit(&t->zthr_state_lock);
	}

	/*
	* Sends a cancel request to the zthr and blocks until the zthr is
	* cancelled. If the zthr is not running (e.g. has been cancelled
	* already), this is a no-op. Note that this function should not be
	* called from syncing context as it could deadlock with the zthr_func.
	*/
	void
	zthr_cancel(zthr_t *t)
	{
	mutex_enter(&t->zthr_request_lock);
	mutex_enter(&t->zthr_state_lock);

	/*
	* Since we are holding the zthr_state_lock at this point
	* we can find the state in one of the following 4 states:
	*
	* [1] The thread has already been cancelled, therefore
	* there is nothing for us to do.
	* [2] The thread is sleeping so we set the flag, broadcast
	* the CV and wait for it to exit.
	* [3] The thread is doing work, in which case we just set
	* the flag and wait for it to finish.
	* [4] The thread was just created/resumed, in which case
	* the behavior is similar to [3].
	*
	* Since requests are serialized, by the time that we get
	* control back we expect that the zthr is cancelled and
	* not running anymore.
	*/
	if (t->zthr_thread != NULL) {
	t->zthr_cancel = B_TRUE;

	/* broadcast in case the zthr is sleeping */
	cv_broadcast(&t->zthr_cv);

	while (t->zthr_thread != NULL)
	cv_wait(&t->zthr_cv, &t->zthr_state_lock);

	ASSERT(!t->zthr_cancel);
	}

	mutex_exit(&t->zthr_state_lock);
	mutex_exit(&t->zthr_request_lock);
	}

	/*
	* Sends a resume request to the supplied zthr. If the zthr is already
	* running this is a no-op. Note that this function should not be
	* called from syncing context as it could deadlock with the zthr_func.
	*/
	void
	zthr_resume(zthr_t *t)
	{
	mutex_enter(&t->zthr_request_lock);
	mutex_enter(&t->zthr_state_lock);

	ASSERT3P(&t->zthr_checkfunc, !=, NULL);
	ASSERT3P(&t->zthr_func, !=, NULL);
	ASSERT(!t->zthr_cancel);
	ASSERT(!t->zthr_haswaiters);

	/*
	* There are 4 states that we find the zthr in at this point
	* given the locks that we hold:
	*
	* [1] The zthr was cancelled, so we spawn a new thread for
	* the zthr (common case).
	* [2] The zthr is running at which point this is a no-op.
	* [3] The zthr is sleeping at which point this is a no-op.
	* [4] The zthr was just spawned at which point this is a
	* no-op.
	*/
	if (t->zthr_thread == NULL) {
	t->zthr_thread = thread_create_named(t->zthr_name, NULL, 0,
	- zthr_procedure, t, 0, &p0, TS_RUN, minclsyspri);
	+ zthr_procedure, t, 0, &p0, TS_RUN, t->zthr_pri);
	}

	mutex_exit(&t->zthr_state_lock);
	mutex_exit(&t->zthr_request_lock);
	}

	/*
	* This function is intended to be used by the zthr itself
	* (specifically the zthr_func callback provided) to check
	* if another thread has signaled it to stop running before
	* doing some expensive operation.
	*
	* returns TRUE if we are in the middle of trying to cancel
	* this thread.
	*
	* returns FALSE otherwise.
	*/
	boolean_t
	zthr_iscancelled(zthr_t *t)
	{
	ASSERT3P(t->zthr_thread, ==, curthread);

	/*
	* The majority of the functions here grab zthr_request_lock
	* first and then zthr_state_lock. This function only grabs
	* the zthr_state_lock. That is because this function should
	* only be called from the zthr_func to check if someone has
	* issued a zthr_cancel() on the thread. If there is a zthr_cancel()
	* happening concurrently, attempting to grab the request lock
	* here would result in a deadlock.
	*
	* By grabbing only the zthr_state_lock this function is allowed
	* to run concurrently with a zthr_cancel() request.
	*/
	mutex_enter(&t->zthr_state_lock);
	boolean_t cancelled = t->zthr_cancel;
	mutex_exit(&t->zthr_state_lock);
	return (cancelled);
	}

	/*
	* Wait for the zthr to finish its current function. Similar to
	* zthr_iscancelled, you can use zthr_has_waiters to have the zthr_func end
	* early. Unlike zthr_cancel, the thread is not destroyed. If the zthr was
	* sleeping or cancelled, return immediately.
	*/
	void
	zthr_wait_cycle_done(zthr_t *t)
	{
	mutex_enter(&t->zthr_state_lock);

	/*
	* Since we are holding the zthr_state_lock at this point
	* we can find the state in one of the following 5 states:
	*
	* [1] The thread has already cancelled, therefore
	* there is nothing for us to do.
	* [2] The thread is sleeping so we set the flag, broadcast
	* the CV and wait for it to exit.
	* [3] The thread is doing work, in which case we just set
	* the flag and wait for it to finish.
	* [4] The thread was just created/resumed, in which case
	* the behavior is similar to [3].
	* [5] The thread is the middle of being cancelled, which is
	* similar to [3]. We'll wait for the cancel, which is
	* waiting for the zthr func.
	*
	* Since requests are serialized, by the time that we get
	* control back we expect that the zthr has completed it's
	* zthr_func.
	*/
	if (t->zthr_thread != NULL) {
	t->zthr_haswaiters = B_TRUE;

	/* broadcast in case the zthr is sleeping */
	cv_broadcast(&t->zthr_cv);

	while ((t->zthr_haswaiters) && (t->zthr_thread != NULL))
	cv_wait(&t->zthr_wait_cv, &t->zthr_state_lock);

	ASSERT(!t->zthr_haswaiters);
	}

	mutex_exit(&t->zthr_state_lock);
	}

	/*
	* This function is intended to be used by the zthr itself
	* to check if another thread is waiting on it to finish
	*
	* returns TRUE if we have been asked to finish.
	*
	* returns FALSE otherwise.
	*/
	boolean_t
	zthr_has_waiters(zthr_t *t)
	{
	ASSERT3P(t->zthr_thread, ==, curthread);

	mutex_enter(&t->zthr_state_lock);

	/*
	* Similarly to zthr_iscancelled(), we only grab the
	* zthr_state_lock so that the zthr itself can use this
	* to check for the request.
	*/
	boolean_t has_waiters = t->zthr_haswaiters;
	mutex_exit(&t->zthr_state_lock);
	return (has_waiters);
	}
	diff --git a/sys/contrib/openzfs/module/zfs/zvol.c b/sys/contrib/openzfs/module/zfs/zvol.c
	index b6609363f047..88450aabb469 100644
	--- a/sys/contrib/openzfs/module/zfs/zvol.c
	+++ b/sys/contrib/openzfs/module/zfs/zvol.c
	@@ -1,1753 +1,1754 @@
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/*
	* Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC.
	* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
	* Rewritten for Linux by Brian Behlendorf <behlendorf1@llnl.gov>.
	* LLNL-CODE-403049.
	*
	* ZFS volume emulation driver.
	*
	* Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
	* Volumes are accessed through the symbolic links named:
	*
	* /dev/<pool_name>/<dataset_name>
	*
	* Volumes are persistent through reboot and module load. No user command
	* needs to be run before opening and using a device.
	*
	* Copyright 2014 Nexenta Systems, Inc. All rights reserved.
	* Copyright (c) 2016 Actifio, Inc. All rights reserved.
	* Copyright (c) 2012, 2019 by Delphix. All rights reserved.
	*/

	/*
	* Note on locking of zvol state structures.
	*
	* These structures are used to maintain internal state used to emulate block
	* devices on top of zvols. In particular, management of device minor number
	* operations - create, remove, rename, and set_snapdev - involves access to
	* these structures. The zvol_state_lock is primarily used to protect the
	* zvol_state_list. The zv->zv_state_lock is used to protect the contents
	* of the zvol_state_t structures, as well as to make sure that when the
	* time comes to remove the structure from the list, it is not in use, and
	* therefore, it can be taken off zvol_state_list and freed.
	*
	* The zv_suspend_lock was introduced to allow for suspending I/O to a zvol,
	* e.g. for the duration of receive and rollback operations. This lock can be
	* held for significant periods of time. Given that it is undesirable to hold
	* mutexes for long periods of time, the following lock ordering applies:
	* - take zvol_state_lock if necessary, to protect zvol_state_list
	* - take zv_suspend_lock if necessary, by the code path in question
	* - take zv_state_lock to protect zvol_state_t
	*
	* The minor operations are issued to spa->spa_zvol_taskq queues, that are
	* single-threaded (to preserve order of minor operations), and are executed
	* through the zvol_task_cb that dispatches the specific operations. Therefore,
	* these operations are serialized per pool. Consequently, we can be certain
	* that for a given zvol, there is only one operation at a time in progress.
	* That is why one can be sure that first, zvol_state_t for a given zvol is
	* allocated and placed on zvol_state_list, and then other minor operations
	* for this zvol are going to proceed in the order of issue.
	*
	*/

	#include <sys/dataset_kstats.h>
	#include <sys/dbuf.h>
	#include <sys/dmu_traverse.h>
	#include <sys/dsl_dataset.h>
	#include <sys/dsl_prop.h>
	#include <sys/dsl_dir.h>
	#include <sys/zap.h>
	#include <sys/zfeature.h>
	#include <sys/zil_impl.h>
	#include <sys/dmu_tx.h>
	#include <sys/zio.h>
	#include <sys/zfs_rlock.h>
	#include <sys/spa_impl.h>
	#include <sys/zvol.h>

	#include <sys/zvol_impl.h>


	unsigned int zvol_inhibit_dev = 0;
	unsigned int zvol_volmode = ZFS_VOLMODE_GEOM;

	struct hlist_head *zvol_htable;
	list_t zvol_state_list;
	krwlock_t zvol_state_lock;
	const zvol_platform_ops_t *ops;

	typedef enum {
	ZVOL_ASYNC_REMOVE_MINORS,
	ZVOL_ASYNC_RENAME_MINORS,
	ZVOL_ASYNC_SET_SNAPDEV,
	ZVOL_ASYNC_SET_VOLMODE,
	ZVOL_ASYNC_MAX
	} zvol_async_op_t;

	typedef struct {
	zvol_async_op_t op;
	- char pool[MAXNAMELEN];
	char name1[MAXNAMELEN];
	char name2[MAXNAMELEN];
	- zprop_source_t source;
	uint64_t value;
	} zvol_task_t;

	uint64_t
	zvol_name_hash(const char *name)
	{
	int i;
	uint64_t crc = -1ULL;
	const uint8_t p = (const uint8_t )name;
	ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY);
	for (i = 0; i < MAXNAMELEN - 1 && *p; i++, p++) {
	crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (*p)) & 0xFF];
	}
	return (crc);
	}

	/*
	* Find a zvol_state_t given the name and hash generated by zvol_name_hash.
	* If found, return with zv_suspend_lock and zv_state_lock taken, otherwise,
	* return (NULL) without the taking locks. The zv_suspend_lock is always taken
	* before zv_state_lock. The mode argument indicates the mode (including none)
	* for zv_suspend_lock to be taken.
	*/
	zvol_state_t *
	zvol_find_by_name_hash(const char *name, uint64_t hash, int mode)
	{
	zvol_state_t *zv;
	struct hlist_node *p = NULL;

	rw_enter(&zvol_state_lock, RW_READER);
	hlist_for_each(p, ZVOL_HT_HEAD(hash)) {
	zv = hlist_entry(p, zvol_state_t, zv_hlink);
	mutex_enter(&zv->zv_state_lock);
	if (zv->zv_hash == hash &&
	strncmp(zv->zv_name, name, MAXNAMELEN) == 0) {
	/*
	* this is the right zvol, take the locks in the
	* right order
	*/
	if (mode != RW_NONE &&
	!rw_tryenter(&zv->zv_suspend_lock, mode)) {
	mutex_exit(&zv->zv_state_lock);
	rw_enter(&zv->zv_suspend_lock, mode);
	mutex_enter(&zv->zv_state_lock);
	/*
	* zvol cannot be renamed as we continue
	* to hold zvol_state_lock
	*/
	ASSERT(zv->zv_hash == hash &&
	strncmp(zv->zv_name, name, MAXNAMELEN)
	== 0);
	}
	rw_exit(&zvol_state_lock);
	return (zv);
	}
	mutex_exit(&zv->zv_state_lock);
	}
	rw_exit(&zvol_state_lock);

	return (NULL);
	}

	/*
	* Find a zvol_state_t given the name.
	* If found, return with zv_suspend_lock and zv_state_lock taken, otherwise,
	* return (NULL) without the taking locks. The zv_suspend_lock is always taken
	* before zv_state_lock. The mode argument indicates the mode (including none)
	* for zv_suspend_lock to be taken.
	*/
	static zvol_state_t *
	zvol_find_by_name(const char *name, int mode)
	{
	return (zvol_find_by_name_hash(name, zvol_name_hash(name), mode));
	}

	/*
	* ZFS_IOC_CREATE callback handles dmu zvol and zap object creation.
	*/
	void
	zvol_create_cb(objset_t os, void arg, cred_t cr, dmu_tx_t tx)
	{
	zfs_creat_t *zct = arg;
	nvlist_t *nvprops = zct->zct_props;
	int error;
	uint64_t volblocksize, volsize;

	VERIFY(nvlist_lookup_uint64(nvprops,
	zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
	if (nvlist_lookup_uint64(nvprops,
	zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
	volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);

	/*
	* These properties must be removed from the list so the generic
	* property setting step won't apply to them.
	*/
	VERIFY(nvlist_remove_all(nvprops,
	zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
	(void) nvlist_remove_all(nvprops,
	zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));

	error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
	DMU_OT_NONE, 0, tx);
	ASSERT(error == 0);

	error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
	DMU_OT_NONE, 0, tx);
	ASSERT(error == 0);

	error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
	ASSERT(error == 0);
	}

	/*
	* ZFS_IOC_OBJSET_STATS entry point.
	*/
	int
	zvol_get_stats(objset_t os, nvlist_t nv)
	{
	int error;
	dmu_object_info_t *doi;
	uint64_t val;

	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
	if (error)
	return (SET_ERROR(error));

	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
	doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP);
	error = dmu_object_info(os, ZVOL_OBJ, doi);

	if (error == 0) {
	dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
	doi->doi_data_block_size);
	}

	kmem_free(doi, sizeof (dmu_object_info_t));

	return (SET_ERROR(error));
	}

	/*
	* Sanity check volume size.
	*/
	int
	zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
	{
	if (volsize == 0)
	return (SET_ERROR(EINVAL));

	if (volsize % blocksize != 0)
	return (SET_ERROR(EINVAL));

	#ifdef _ILP32
	if (volsize - 1 > SPEC_MAXOFFSET_T)
	return (SET_ERROR(EOVERFLOW));
	#endif
	return (0);
	}

	/*
	* Ensure the zap is flushed then inform the VFS of the capacity change.
	*/
	static int
	zvol_update_volsize(uint64_t volsize, objset_t *os)
	{
	dmu_tx_t *tx;
	int error;
	uint64_t txg;

	tx = dmu_tx_create(os);
	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
	dmu_tx_mark_netfree(tx);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	return (SET_ERROR(error));
	}
	txg = dmu_tx_get_txg(tx);

	error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
	&volsize, tx);
	dmu_tx_commit(tx);

	txg_wait_synced(dmu_objset_pool(os), txg);

	if (error == 0)
	error = dmu_free_long_range(os,
	ZVOL_OBJ, volsize, DMU_OBJECT_END);

	return (error);
	}

	/*
	* Set ZFS_PROP_VOLSIZE set entry point. Note that modifying the volume
	* size will result in a udev "change" event being generated.
	*/
	int
	zvol_set_volsize(const char *name, uint64_t volsize)
	{
	objset_t *os = NULL;
	uint64_t readonly;
	int error;
	boolean_t owned = B_FALSE;

	error = dsl_prop_get_integer(name,
	zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL);
	if (error != 0)
	return (SET_ERROR(error));
	if (readonly)
	return (SET_ERROR(EROFS));

	zvol_state_t *zv = zvol_find_by_name(name, RW_READER);

	ASSERT(zv == NULL \|\| (MUTEX_HELD(&zv->zv_state_lock) &&
	RW_READ_HELD(&zv->zv_suspend_lock)));

	if (zv == NULL \|\| zv->zv_objset == NULL) {
	if (zv != NULL)
	rw_exit(&zv->zv_suspend_lock);
	if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, B_TRUE,
	FTAG, &os)) != 0) {
	if (zv != NULL)
	mutex_exit(&zv->zv_state_lock);
	return (SET_ERROR(error));
	}
	owned = B_TRUE;
	if (zv != NULL)
	zv->zv_objset = os;
	} else {
	os = zv->zv_objset;
	}

	dmu_object_info_t doi = kmem_alloc(sizeof (doi), KM_SLEEP);

	if ((error = dmu_object_info(os, ZVOL_OBJ, doi)) \|\|
	(error = zvol_check_volsize(volsize, doi->doi_data_block_size)))
	goto out;

	error = zvol_update_volsize(volsize, os);
	if (error == 0 && zv != NULL) {
	zv->zv_volsize = volsize;
	zv->zv_changed = 1;
	}
	out:
	kmem_free(doi, sizeof (dmu_object_info_t));

	if (owned) {
	dmu_objset_disown(os, B_TRUE, FTAG);
	if (zv != NULL)
	zv->zv_objset = NULL;
	} else {
	rw_exit(&zv->zv_suspend_lock);
	}

	if (zv != NULL)
	mutex_exit(&zv->zv_state_lock);

	if (error == 0 && zv != NULL)
	ops->zv_update_volsize(zv, volsize);

	return (SET_ERROR(error));
	}

	/*
	* Sanity check volume block size.
	*/
	int
	zvol_check_volblocksize(const char *name, uint64_t volblocksize)
	{
	/* Record sizes above 128k need the feature to be enabled */
	if (volblocksize > SPA_OLD_MAXBLOCKSIZE) {
	spa_t *spa;
	int error;

	if ((error = spa_open(name, &spa, FTAG)) != 0)
	return (error);

	if (!spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) {
	spa_close(spa, FTAG);
	return (SET_ERROR(ENOTSUP));
	}

	/*
	* We don't allow setting the property above 1MB,
	* unless the tunable has been changed.
	*/
	if (volblocksize > zfs_max_recordsize)
	return (SET_ERROR(EDOM));

	spa_close(spa, FTAG);
	}

	if (volblocksize < SPA_MINBLOCKSIZE \|\|
	volblocksize > SPA_MAXBLOCKSIZE \|\|
	!ISP2(volblocksize))
	return (SET_ERROR(EDOM));

	return (0);
	}

	/*
	* Set ZFS_PROP_VOLBLOCKSIZE set entry point.
	*/
	int
	zvol_set_volblocksize(const char *name, uint64_t volblocksize)
	{
	zvol_state_t *zv;
	dmu_tx_t *tx;
	int error;

	zv = zvol_find_by_name(name, RW_READER);

	if (zv == NULL)
	return (SET_ERROR(ENXIO));

	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
	ASSERT(RW_READ_HELD(&zv->zv_suspend_lock));

	if (zv->zv_flags & ZVOL_RDONLY) {
	mutex_exit(&zv->zv_state_lock);
	rw_exit(&zv->zv_suspend_lock);
	return (SET_ERROR(EROFS));
	}

	tx = dmu_tx_create(zv->zv_objset);
	dmu_tx_hold_bonus(tx, ZVOL_OBJ);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	} else {
	error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ,
	volblocksize, 0, tx);
	if (error == ENOTSUP)
	error = SET_ERROR(EBUSY);
	dmu_tx_commit(tx);
	if (error == 0)
	zv->zv_volblocksize = volblocksize;
	}

	mutex_exit(&zv->zv_state_lock);
	rw_exit(&zv->zv_suspend_lock);

	return (SET_ERROR(error));
	}

	/*
	* Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we
	* implement DKIOCFREE/free-long-range.
	*/
	static int
	zvol_replay_truncate(void arg1, void arg2, boolean_t byteswap)
	{
	zvol_state_t *zv = arg1;
	lr_truncate_t *lr = arg2;
	uint64_t offset, length;

	if (byteswap)
	byteswap_uint64_array(lr, sizeof (*lr));

	offset = lr->lr_offset;
	length = lr->lr_length;

	dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
	dmu_tx_mark_netfree(tx);
	int error = dmu_tx_assign(tx, TXG_WAIT);
	if (error != 0) {
	dmu_tx_abort(tx);
	} else {
	zil_replaying(zv->zv_zilog, tx);
	dmu_tx_commit(tx);
	error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset,
	length);
	}

	return (error);
	}

	/*
	* Replay a TX_WRITE ZIL transaction that didn't get committed
	* after a system failure
	*/
	static int
	zvol_replay_write(void arg1, void arg2, boolean_t byteswap)
	{
	zvol_state_t *zv = arg1;
	lr_write_t *lr = arg2;
	objset_t *os = zv->zv_objset;
	char data = (char )(lr + 1); /* data follows lr_write_t */
	uint64_t offset, length;
	dmu_tx_t *tx;
	int error;

	if (byteswap)
	byteswap_uint64_array(lr, sizeof (*lr));

	offset = lr->lr_offset;
	length = lr->lr_length;

	/* If it's a dmu_sync() block, write the whole block */
	if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
	uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
	if (length < blocksize) {
	offset -= offset % blocksize;
	length = blocksize;
	}
	}

	tx = dmu_tx_create(os);
	dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length);
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
	dmu_tx_abort(tx);
	} else {
	dmu_write(os, ZVOL_OBJ, offset, length, data, tx);
	zil_replaying(zv->zv_zilog, tx);
	dmu_tx_commit(tx);
	}

	return (error);
	}

	static int
	zvol_replay_err(void arg1, void arg2, boolean_t byteswap)
	{
	return (SET_ERROR(ENOTSUP));
	}

	/*
	* Callback vectors for replaying records.
	* Only TX_WRITE and TX_TRUNCATE are needed for zvol.
	*/
	zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
	zvol_replay_err, /* no such transaction type */
	zvol_replay_err, /* TX_CREATE */
	zvol_replay_err, /* TX_MKDIR */
	zvol_replay_err, /* TX_MKXATTR */
	zvol_replay_err, /* TX_SYMLINK */
	zvol_replay_err, /* TX_REMOVE */
	zvol_replay_err, /* TX_RMDIR */
	zvol_replay_err, /* TX_LINK */
	zvol_replay_err, /* TX_RENAME */
	zvol_replay_write, /* TX_WRITE */
	zvol_replay_truncate, /* TX_TRUNCATE */
	zvol_replay_err, /* TX_SETATTR */
	zvol_replay_err, /* TX_ACL */
	zvol_replay_err, /* TX_CREATE_ATTR */
	zvol_replay_err, /* TX_CREATE_ACL_ATTR */
	zvol_replay_err, /* TX_MKDIR_ACL */
	zvol_replay_err, /* TX_MKDIR_ATTR */
	zvol_replay_err, /* TX_MKDIR_ACL_ATTR */
	zvol_replay_err, /* TX_WRITE2 */
	};

	/*
	* zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
	*
	* We store data in the log buffers if it's small enough.
	* Otherwise we will later flush the data out via dmu_sync().
	*/
	ssize_t zvol_immediate_write_sz = 32768;

	void
	zvol_log_write(zvol_state_t zv, dmu_tx_t tx, uint64_t offset,
	uint64_t size, int sync)
	{
	uint32_t blocksize = zv->zv_volblocksize;
	zilog_t *zilog = zv->zv_zilog;
	itx_wr_state_t write_state;

	if (zil_replaying(zilog, tx))
	return;

	if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
	write_state = WR_INDIRECT;
	else if (!spa_has_slogs(zilog->zl_spa) &&
	size >= blocksize && blocksize > zvol_immediate_write_sz)
	write_state = WR_INDIRECT;
	else if (sync)
	write_state = WR_COPIED;
	else
	write_state = WR_NEED_COPY;

	while (size) {
	itx_t *itx;
	lr_write_t *lr;
	itx_wr_state_t wr_state = write_state;
	ssize_t len = size;

	if (wr_state == WR_COPIED && size > zil_max_copied_data(zilog))
	wr_state = WR_NEED_COPY;
	else if (wr_state == WR_INDIRECT)
	len = MIN(blocksize - P2PHASE(offset, blocksize), size);

	itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
	(wr_state == WR_COPIED ? len : 0));
	lr = (lr_write_t *)&itx->itx_lr;
	if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn,
	offset, len, lr+1, DMU_READ_NO_PREFETCH) != 0) {
	zil_itx_destroy(itx);
	itx = zil_itx_create(TX_WRITE, sizeof (*lr));
	lr = (lr_write_t *)&itx->itx_lr;
	wr_state = WR_NEED_COPY;
	}

	itx->itx_wr_state = wr_state;
	lr->lr_foid = ZVOL_OBJ;
	lr->lr_offset = offset;
	lr->lr_length = len;
	lr->lr_blkoff = 0;
	BP_ZERO(&lr->lr_blkptr);

	itx->itx_private = zv;
	itx->itx_sync = sync;

	(void) zil_itx_assign(zilog, itx, tx);

	offset += len;
	size -= len;
	}
	}

	/*
	* Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE.
	*/
	void
	zvol_log_truncate(zvol_state_t zv, dmu_tx_t tx, uint64_t off, uint64_t len,
	boolean_t sync)
	{
	itx_t *itx;
	lr_truncate_t *lr;
	zilog_t *zilog = zv->zv_zilog;

	if (zil_replaying(zilog, tx))
	return;

	itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr));
	lr = (lr_truncate_t *)&itx->itx_lr;
	lr->lr_foid = ZVOL_OBJ;
	lr->lr_offset = off;
	lr->lr_length = len;

	itx->itx_sync = sync;
	zil_itx_assign(zilog, itx, tx);
	}


	/* ARGSUSED */
	static void
	zvol_get_done(zgd_t *zgd, int error)
	{
	if (zgd->zgd_db)
	dmu_buf_rele(zgd->zgd_db, zgd);

	zfs_rangelock_exit(zgd->zgd_lr);

	kmem_free(zgd, sizeof (zgd_t));
	}

	/*
	* Get data to generate a TX_WRITE intent log record.
	*/
	int
	zvol_get_data(void arg, uint64_t arg2, lr_write_t lr, char *buf,
	struct lwb lwb, zio_t zio)
	{
	zvol_state_t *zv = arg;
	uint64_t offset = lr->lr_offset;
	uint64_t size = lr->lr_length;
	dmu_buf_t *db;
	zgd_t *zgd;
	int error;

	ASSERT3P(lwb, !=, NULL);
	ASSERT3P(zio, !=, NULL);
	ASSERT3U(size, !=, 0);

	zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
	zgd->zgd_lwb = lwb;

	/*
	* Write records come in two flavors: immediate and indirect.
	* For small writes it's cheaper to store the data with the
	* log record (immediate); for large writes it's cheaper to
	* sync the data and get a pointer to it (indirect) so that
	* we don't have to write the data twice.
	*/
	if (buf != NULL) { /* immediate write */
	zgd->zgd_lr = zfs_rangelock_enter(&zv->zv_rangelock, offset,
	size, RL_READER);
	error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf,
	DMU_READ_NO_PREFETCH);
	} else { /* indirect write */
	/*
	* Have to lock the whole block to ensure when it's written out
	* and its checksum is being calculated that no one can change
	* the data. Contrarily to zfs_get_data we need not re-check
	* blocksize after we get the lock because it cannot be changed.
	*/
	size = zv->zv_volblocksize;
	offset = P2ALIGN_TYPED(offset, size, uint64_t);
	zgd->zgd_lr = zfs_rangelock_enter(&zv->zv_rangelock, offset,
	size, RL_READER);
	error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db,
	DMU_READ_NO_PREFETCH);
	if (error == 0) {
	blkptr_t *bp = &lr->lr_blkptr;

	zgd->zgd_db = db;
	zgd->zgd_bp = bp;

	ASSERT(db != NULL);
	ASSERT(db->db_offset == offset);
	ASSERT(db->db_size == size);

	error = dmu_sync(zio, lr->lr_common.lrc_txg,
	zvol_get_done, zgd);

	if (error == 0)
	return (0);
	}
	}

	zvol_get_done(zgd, error);

	return (SET_ERROR(error));
	}

	/*
	* The zvol_state_t's are inserted into zvol_state_list and zvol_htable.
	*/

	void
	zvol_insert(zvol_state_t *zv)
	{
	ASSERT(RW_WRITE_HELD(&zvol_state_lock));
	list_insert_head(&zvol_state_list, zv);
	hlist_add_head(&zv->zv_hlink, ZVOL_HT_HEAD(zv->zv_hash));
	}

	/*
	* Simply remove the zvol from to list of zvols.
	*/
	static void
	zvol_remove(zvol_state_t *zv)
	{
	ASSERT(RW_WRITE_HELD(&zvol_state_lock));
	list_remove(&zvol_state_list, zv);
	hlist_del(&zv->zv_hlink);
	}

	/*
	* Setup zv after we just own the zv->objset
	*/
	static int
	zvol_setup_zv(zvol_state_t *zv)
	{
	uint64_t volsize;
	int error;
	uint64_t ro;
	objset_t *os = zv->zv_objset;

	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
	ASSERT(RW_LOCK_HELD(&zv->zv_suspend_lock));

	zv->zv_zilog = NULL;
	zv->zv_flags &= ~ZVOL_WRITTEN_TO;

	error = dsl_prop_get_integer(zv->zv_name, "readonly", &ro, NULL);
	if (error)
	return (SET_ERROR(error));

	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
	if (error)
	return (SET_ERROR(error));

	error = dnode_hold(os, ZVOL_OBJ, zv, &zv->zv_dn);
	if (error)
	return (SET_ERROR(error));

	ops->zv_set_capacity(zv, volsize >> 9);
	zv->zv_volsize = volsize;

	if (ro \|\| dmu_objset_is_snapshot(os) \|\|
	!spa_writeable(dmu_objset_spa(os))) {
	ops->zv_set_disk_ro(zv, 1);
	zv->zv_flags \|= ZVOL_RDONLY;
	} else {
	ops->zv_set_disk_ro(zv, 0);
	zv->zv_flags &= ~ZVOL_RDONLY;
	}
	return (0);
	}

	/*
	* Shutdown every zv_objset related stuff except zv_objset itself.
	* The is the reverse of zvol_setup_zv.
	*/
	static void
	zvol_shutdown_zv(zvol_state_t *zv)
	{
	ASSERT(MUTEX_HELD(&zv->zv_state_lock) &&
	RW_LOCK_HELD(&zv->zv_suspend_lock));

	if (zv->zv_flags & ZVOL_WRITTEN_TO) {
	ASSERT(zv->zv_zilog != NULL);
	zil_close(zv->zv_zilog);
	}

	zv->zv_zilog = NULL;

	dnode_rele(zv->zv_dn, zv);
	zv->zv_dn = NULL;

	/*
	* Evict cached data. We must write out any dirty data before
	* disowning the dataset.
	*/
	if (zv->zv_flags & ZVOL_WRITTEN_TO)
	txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
	(void) dmu_objset_evict_dbufs(zv->zv_objset);
	}

	/*
	* return the proper tag for rollback and recv
	*/
	void *
	zvol_tag(zvol_state_t *zv)
	{
	ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock));
	return (zv->zv_open_count > 0 ? zv : NULL);
	}

	/*
	* Suspend the zvol for recv and rollback.
	*/
	zvol_state_t *
	zvol_suspend(const char *name)
	{
	zvol_state_t *zv;

	zv = zvol_find_by_name(name, RW_WRITER);

	if (zv == NULL)
	return (NULL);

	/* block all I/O, release in zvol_resume. */
	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
	ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock));

	atomic_inc(&zv->zv_suspend_ref);

	if (zv->zv_open_count > 0)
	zvol_shutdown_zv(zv);

	/*
	* do not hold zv_state_lock across suspend/resume to
	* avoid locking up zvol lookups
	*/
	mutex_exit(&zv->zv_state_lock);

	/* zv_suspend_lock is released in zvol_resume() */
	return (zv);
	}

	int
	zvol_resume(zvol_state_t *zv)
	{
	int error = 0;

	ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock));

	mutex_enter(&zv->zv_state_lock);

	if (zv->zv_open_count > 0) {
	VERIFY0(dmu_objset_hold(zv->zv_name, zv, &zv->zv_objset));
	VERIFY3P(zv->zv_objset->os_dsl_dataset->ds_owner, ==, zv);
	VERIFY(dsl_dataset_long_held(zv->zv_objset->os_dsl_dataset));
	dmu_objset_rele(zv->zv_objset, zv);

	error = zvol_setup_zv(zv);
	}

	mutex_exit(&zv->zv_state_lock);

	rw_exit(&zv->zv_suspend_lock);
	/*
	* We need this because we don't hold zvol_state_lock while releasing
	* zv_suspend_lock. zvol_remove_minors_impl thus cannot check
	* zv_suspend_lock to determine it is safe to free because rwlock is
	* not inherent atomic.
	*/
	atomic_dec(&zv->zv_suspend_ref);

	return (SET_ERROR(error));
	}

	int
	zvol_first_open(zvol_state_t *zv, boolean_t readonly)
	{
	objset_t *os;
	int error, locked = 0;
	boolean_t ro;

	ASSERT(RW_READ_HELD(&zv->zv_suspend_lock));
	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	/*
	* In all other cases the spa_namespace_lock is taken before the
	* bdev->bd_mutex lock. But in this case the Linux __blkdev_get()
	* function calls fops->open() with the bdev->bd_mutex lock held.
	* This deadlock can be easily observed with zvols used as vdevs.
	*
	* To avoid a potential lock inversion deadlock we preemptively
	* try to take the spa_namespace_lock(). Normally it will not
	* be contended and this is safe because spa_open_common() handles
	* the case where the caller already holds the spa_namespace_lock.
	*
	* When it is contended we risk a lock inversion if we were to
	* block waiting for the lock. Luckily, the __blkdev_get()
	* function allows us to return -ERESTARTSYS which will result in
	* bdev->bd_mutex being dropped, reacquired, and fops->open() being
	* called again. This process can be repeated safely until both
	* locks are acquired.
	*/
	if (!mutex_owned(&spa_namespace_lock)) {
	locked = mutex_tryenter(&spa_namespace_lock);
	if (!locked)
	return (SET_ERROR(EINTR));
	}

	ro = (readonly \|\| (strchr(zv->zv_name, '@') != NULL));
	error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, ro, B_TRUE, zv, &os);
	if (error)
	goto out_mutex;

	zv->zv_objset = os;

	error = zvol_setup_zv(zv);

	if (error) {
	dmu_objset_disown(os, 1, zv);
	zv->zv_objset = NULL;
	}

	out_mutex:
	if (locked)
	mutex_exit(&spa_namespace_lock);
	return (SET_ERROR(error));
	}

	void
	zvol_last_close(zvol_state_t *zv)
	{
	ASSERT(RW_READ_HELD(&zv->zv_suspend_lock));
	ASSERT(MUTEX_HELD(&zv->zv_state_lock));

	zvol_shutdown_zv(zv);

	dmu_objset_disown(zv->zv_objset, 1, zv);
	zv->zv_objset = NULL;
	}

	typedef struct minors_job {
	list_t *list;
	list_node_t link;
	/* input */
	char *name;
	/* output */
	int error;
	} minors_job_t;

	/*
	* Prefetch zvol dnodes for the minors_job
	*/
	static void
	zvol_prefetch_minors_impl(void *arg)
	{
	minors_job_t *job = arg;
	char *dsname = job->name;
	objset_t *os = NULL;

	job->error = dmu_objset_own(dsname, DMU_OST_ZVOL, B_TRUE, B_TRUE,
	FTAG, &os);
	if (job->error == 0) {
	dmu_prefetch(os, ZVOL_OBJ, 0, 0, 0, ZIO_PRIORITY_SYNC_READ);
	dmu_objset_disown(os, B_TRUE, FTAG);
	}
	}

	/*
	* Mask errors to continue dmu_objset_find() traversal
	*/
	static int
	zvol_create_snap_minor_cb(const char dsname, void arg)
	{
	minors_job_t *j = arg;
	list_t *minors_list = j->list;
	const char *name = j->name;

	ASSERT0(MUTEX_HELD(&spa_namespace_lock));

	/* skip the designated dataset */
	if (name && strcmp(dsname, name) == 0)
	return (0);

	/* at this point, the dsname should name a snapshot */
	if (strchr(dsname, '@') == 0) {
	dprintf("zvol_create_snap_minor_cb(): "
	"%s is not a snapshot name\n", dsname);
	} else {
	minors_job_t *job;
	char *n = kmem_strdup(dsname);
	if (n == NULL)
	return (0);

	job = kmem_alloc(sizeof (minors_job_t), KM_SLEEP);
	job->name = n;
	job->list = minors_list;
	job->error = 0;
	list_insert_tail(minors_list, job);
	/* don't care if dispatch fails, because job->error is 0 */
	taskq_dispatch(system_taskq, zvol_prefetch_minors_impl, job,
	TQ_SLEEP);
	}

	return (0);
	}

	/*
	* Mask errors to continue dmu_objset_find() traversal
	*/
	static int
	zvol_create_minors_cb(const char dsname, void arg)
	{
	uint64_t snapdev;
	int error;
	list_t *minors_list = arg;

	ASSERT0(MUTEX_HELD(&spa_namespace_lock));

	error = dsl_prop_get_integer(dsname, "snapdev", &snapdev, NULL);
	if (error)
	return (0);

	/*
	* Given the name and the 'snapdev' property, create device minor nodes
	* with the linkages to zvols/snapshots as needed.
	* If the name represents a zvol, create a minor node for the zvol, then
	* check if its snapshots are 'visible', and if so, iterate over the
	* snapshots and create device minor nodes for those.
	*/
	if (strchr(dsname, '@') == 0) {
	minors_job_t *job;
	char *n = kmem_strdup(dsname);
	if (n == NULL)
	return (0);

	job = kmem_alloc(sizeof (minors_job_t), KM_SLEEP);
	job->name = n;
	job->list = minors_list;
	job->error = 0;
	list_insert_tail(minors_list, job);
	/* don't care if dispatch fails, because job->error is 0 */
	taskq_dispatch(system_taskq, zvol_prefetch_minors_impl, job,
	TQ_SLEEP);

	if (snapdev == ZFS_SNAPDEV_VISIBLE) {
	/*
	* traverse snapshots only, do not traverse children,
	* and skip the 'dsname'
	*/
	error = dmu_objset_find(dsname,
	zvol_create_snap_minor_cb, (void *)job,
	DS_FIND_SNAPSHOTS);
	}
	} else {
	dprintf("zvol_create_minors_cb(): %s is not a zvol name\n",
	dsname);
	}

	return (0);
	}

	/*
	* Create minors for the specified dataset, including children and snapshots.
	* Pay attention to the 'snapdev' property and iterate over the snapshots
	* only if they are 'visible'. This approach allows one to assure that the
	* snapshot metadata is read from disk only if it is needed.
	*
	* The name can represent a dataset to be recursively scanned for zvols and
	* their snapshots, or a single zvol snapshot. If the name represents a
	* dataset, the scan is performed in two nested stages:
	* - scan the dataset for zvols, and
	* - for each zvol, create a minor node, then check if the zvol's snapshots
	* are 'visible', and only then iterate over the snapshots if needed
	*
	* If the name represents a snapshot, a check is performed if the snapshot is
	* 'visible' (which also verifies that the parent is a zvol), and if so,
	* a minor node for that snapshot is created.
	*/
	void
	zvol_create_minors_recursive(const char *name)
	{
	list_t minors_list;
	minors_job_t *job;

	if (zvol_inhibit_dev)
	return;

	/*
	* This is the list for prefetch jobs. Whenever we found a match
	* during dmu_objset_find, we insert a minors_job to the list and do
	* taskq_dispatch to parallel prefetch zvol dnodes. Note we don't need
	* any lock because all list operation is done on the current thread.
	*
	* We will use this list to do zvol_create_minor_impl after prefetch
	* so we don't have to traverse using dmu_objset_find again.
	*/
	list_create(&minors_list, sizeof (minors_job_t),
	offsetof(minors_job_t, link));


	if (strchr(name, '@') != NULL) {
	uint64_t snapdev;

	int error = dsl_prop_get_integer(name, "snapdev",
	&snapdev, NULL);

	if (error == 0 && snapdev == ZFS_SNAPDEV_VISIBLE)
	(void) ops->zv_create_minor(name);
	} else {
	fstrans_cookie_t cookie = spl_fstrans_mark();
	(void) dmu_objset_find(name, zvol_create_minors_cb,
	&minors_list, DS_FIND_CHILDREN);
	spl_fstrans_unmark(cookie);
	}

	taskq_wait_outstanding(system_taskq, 0);

	/*
	* Prefetch is completed, we can do zvol_create_minor_impl
	* sequentially.
	*/
	while ((job = list_head(&minors_list)) != NULL) {
	list_remove(&minors_list, job);
	if (!job->error)
	(void) ops->zv_create_minor(job->name);
	kmem_strfree(job->name);
	kmem_free(job, sizeof (minors_job_t));
	}

	list_destroy(&minors_list);
	}

	void
	zvol_create_minor(const char *name)
	{
	/*
	* Note: the dsl_pool_config_lock must not be held.
	* Minor node creation needs to obtain the zvol_state_lock.
	* zvol_open() obtains the zvol_state_lock and then the dsl pool
	* config lock. Therefore, we can't have the config lock now if
	* we are going to wait for the zvol_state_lock, because it
	* would be a lock order inversion which could lead to deadlock.
	*/

	if (zvol_inhibit_dev)
	return;

	if (strchr(name, '@') != NULL) {
	uint64_t snapdev;

	int error = dsl_prop_get_integer(name,
	"snapdev", &snapdev, NULL);

	if (error == 0 && snapdev == ZFS_SNAPDEV_VISIBLE)
	(void) ops->zv_create_minor(name);
	} else {
	(void) ops->zv_create_minor(name);
	}
	}

	/*
	* Remove minors for specified dataset including children and snapshots.
	*/

	+static void
	+zvol_free_task(void *arg)
	+{
	+ ops->zv_free(arg);
	+}
	+
	void
	zvol_remove_minors_impl(const char *name)
	{
	zvol_state_t zv, zv_next;
	int namelen = ((name) ? strlen(name) : 0);
	taskqid_t t;
	list_t free_list;

	if (zvol_inhibit_dev)
	return;

	list_create(&free_list, sizeof (zvol_state_t),
	offsetof(zvol_state_t, zv_next));

	rw_enter(&zvol_state_lock, RW_WRITER);

	for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) {
	zv_next = list_next(&zvol_state_list, zv);

	mutex_enter(&zv->zv_state_lock);
	if (name == NULL \|\| strcmp(zv->zv_name, name) == 0 \|\|
	(strncmp(zv->zv_name, name, namelen) == 0 &&
	(zv->zv_name[namelen] == '/' \|\|
	zv->zv_name[namelen] == '@'))) {
	/*
	* By holding zv_state_lock here, we guarantee that no
	* one is currently using this zv
	*/

	/* If in use, leave alone */
	if (zv->zv_open_count > 0 \|\|
	atomic_read(&zv->zv_suspend_ref)) {
	mutex_exit(&zv->zv_state_lock);
	continue;
	}

	zvol_remove(zv);

	/*
	* Cleared while holding zvol_state_lock as a writer
	* which will prevent zvol_open() from opening it.
	*/
	ops->zv_clear_private(zv);

	/* Drop zv_state_lock before zvol_free() */
	mutex_exit(&zv->zv_state_lock);

	/* Try parallel zv_free, if failed do it in place */
	- t = taskq_dispatch(system_taskq,
	- (task_func_t *)ops->zv_free, zv, TQ_SLEEP);
	+ t = taskq_dispatch(system_taskq, zvol_free_task, zv,
	+ TQ_SLEEP);
	if (t == TASKQID_INVALID)
	list_insert_head(&free_list, zv);
	} else {
	mutex_exit(&zv->zv_state_lock);
	}
	}
	rw_exit(&zvol_state_lock);

	/* Drop zvol_state_lock before calling zvol_free() */
	while ((zv = list_head(&free_list)) != NULL) {
	list_remove(&free_list, zv);
	ops->zv_free(zv);
	}
	}

	/* Remove minor for this specific volume only */
	static void
	zvol_remove_minor_impl(const char *name)
	{
	zvol_state_t zv = NULL, zv_next;

	if (zvol_inhibit_dev)
	return;

	rw_enter(&zvol_state_lock, RW_WRITER);

	for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) {
	zv_next = list_next(&zvol_state_list, zv);

	mutex_enter(&zv->zv_state_lock);
	if (strcmp(zv->zv_name, name) == 0) {
	/*
	* By holding zv_state_lock here, we guarantee that no
	* one is currently using this zv
	*/

	/* If in use, leave alone */
	if (zv->zv_open_count > 0 \|\|
	atomic_read(&zv->zv_suspend_ref)) {
	mutex_exit(&zv->zv_state_lock);
	continue;
	}
	zvol_remove(zv);

	ops->zv_clear_private(zv);
	mutex_exit(&zv->zv_state_lock);
	break;
	} else {
	mutex_exit(&zv->zv_state_lock);
	}
	}

	/* Drop zvol_state_lock before calling zvol_free() */
	rw_exit(&zvol_state_lock);

	if (zv != NULL)
	ops->zv_free(zv);
	}

	/*
	* Rename minors for specified dataset including children and snapshots.
	*/
	static void
	zvol_rename_minors_impl(const char oldname, const char newname)
	{
	zvol_state_t zv, zv_next;
	int oldnamelen, newnamelen;

	if (zvol_inhibit_dev)
	return;

	oldnamelen = strlen(oldname);
	newnamelen = strlen(newname);

	rw_enter(&zvol_state_lock, RW_READER);

	for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) {
	zv_next = list_next(&zvol_state_list, zv);

	mutex_enter(&zv->zv_state_lock);

	if (strcmp(zv->zv_name, oldname) == 0) {
	ops->zv_rename_minor(zv, newname);
	} else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 &&
	(zv->zv_name[oldnamelen] == '/' \|\|
	zv->zv_name[oldnamelen] == '@')) {
	char *name = kmem_asprintf("%s%c%s", newname,
	zv->zv_name[oldnamelen],
	zv->zv_name + oldnamelen + 1);
	ops->zv_rename_minor(zv, name);
	kmem_strfree(name);
	}

	mutex_exit(&zv->zv_state_lock);
	}

	rw_exit(&zvol_state_lock);
	}

	typedef struct zvol_snapdev_cb_arg {
	uint64_t snapdev;
	} zvol_snapdev_cb_arg_t;

	static int
	zvol_set_snapdev_cb(const char dsname, void param)
	{
	zvol_snapdev_cb_arg_t *arg = param;

	if (strchr(dsname, '@') == NULL)
	return (0);

	switch (arg->snapdev) {
	case ZFS_SNAPDEV_VISIBLE:
	(void) ops->zv_create_minor(dsname);
	break;
	case ZFS_SNAPDEV_HIDDEN:
	(void) zvol_remove_minor_impl(dsname);
	break;
	}

	return (0);
	}

	static void
	zvol_set_snapdev_impl(char *name, uint64_t snapdev)
	{
	zvol_snapdev_cb_arg_t arg = {snapdev};
	fstrans_cookie_t cookie = spl_fstrans_mark();
	/*
	* The zvol_set_snapdev_sync() sets snapdev appropriately
	* in the dataset hierarchy. Here, we only scan snapshots.
	*/
	dmu_objset_find(name, zvol_set_snapdev_cb, &arg, DS_FIND_SNAPSHOTS);
	spl_fstrans_unmark(cookie);
	}

	typedef struct zvol_volmode_cb_arg {
	uint64_t volmode;
	} zvol_volmode_cb_arg_t;

	static void
	zvol_set_volmode_impl(char *name, uint64_t volmode)
	{
	fstrans_cookie_t cookie;
	uint64_t old_volmode;
	zvol_state_t *zv;

	if (strchr(name, '@') != NULL)
	return;

	/*
	* It's unfortunate we need to remove minors before we create new ones:
	* this is necessary because our backing gendisk (zvol_state->zv_disk)
	* could be different when we set, for instance, volmode from "geom"
	* to "dev" (or vice versa).
	*/
	zv = zvol_find_by_name(name, RW_NONE);
	if (zv == NULL && volmode == ZFS_VOLMODE_NONE)
	return;
	if (zv != NULL) {
	old_volmode = zv->zv_volmode;
	mutex_exit(&zv->zv_state_lock);
	if (old_volmode == volmode)
	return;
	zvol_wait_close(zv);
	}
	cookie = spl_fstrans_mark();
	switch (volmode) {
	case ZFS_VOLMODE_NONE:
	(void) zvol_remove_minor_impl(name);
	break;
	case ZFS_VOLMODE_GEOM:
	case ZFS_VOLMODE_DEV:
	(void) zvol_remove_minor_impl(name);
	(void) ops->zv_create_minor(name);
	break;
	case ZFS_VOLMODE_DEFAULT:
	(void) zvol_remove_minor_impl(name);
	if (zvol_volmode == ZFS_VOLMODE_NONE)
	break;
	else /* if zvol_volmode is invalid defaults to "geom" */
	(void) ops->zv_create_minor(name);
	break;
	}
	spl_fstrans_unmark(cookie);
	}

	static zvol_task_t *
	zvol_task_alloc(zvol_async_op_t op, const char name1, const char name2,
	uint64_t value)
	{
	zvol_task_t *task;
	- char *delim;

	/* Never allow tasks on hidden names. */
	if (name1[0] == '$')
	return (NULL);

	task = kmem_zalloc(sizeof (zvol_task_t), KM_SLEEP);
	task->op = op;
	task->value = value;
	- delim = strchr(name1, '/');
	- strlcpy(task->pool, name1, delim ? (delim - name1 + 1) : MAXNAMELEN);

	strlcpy(task->name1, name1, MAXNAMELEN);
	if (name2 != NULL)
	strlcpy(task->name2, name2, MAXNAMELEN);

	return (task);
	}

	static void
	zvol_task_free(zvol_task_t *task)
	{
	kmem_free(task, sizeof (zvol_task_t));
	}

	/*
	* The worker thread function performed asynchronously.
	*/
	static void
	zvol_task_cb(void *arg)
	{
	zvol_task_t *task = arg;

	switch (task->op) {
	case ZVOL_ASYNC_REMOVE_MINORS:
	zvol_remove_minors_impl(task->name1);
	break;
	case ZVOL_ASYNC_RENAME_MINORS:
	zvol_rename_minors_impl(task->name1, task->name2);
	break;
	case ZVOL_ASYNC_SET_SNAPDEV:
	zvol_set_snapdev_impl(task->name1, task->value);
	break;
	case ZVOL_ASYNC_SET_VOLMODE:
	zvol_set_volmode_impl(task->name1, task->value);
	break;
	default:
	VERIFY(0);
	break;
	}

	zvol_task_free(task);
	}

	typedef struct zvol_set_prop_int_arg {
	const char *zsda_name;
	uint64_t zsda_value;
	zprop_source_t zsda_source;
	dmu_tx_t *zsda_tx;
	} zvol_set_prop_int_arg_t;

	/*
	* Sanity check the dataset for safe use by the sync task. No additional
	* conditions are imposed.
	*/
	static int
	zvol_set_snapdev_check(void arg, dmu_tx_t tx)
	{
	zvol_set_prop_int_arg_t *zsda = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dir_t *dd;
	int error;

	error = dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL);
	if (error != 0)
	return (error);

	dsl_dir_rele(dd, FTAG);

	return (error);
	}

	/* ARGSUSED */
	static int
	zvol_set_snapdev_sync_cb(dsl_pool_t dp, dsl_dataset_t ds, void *arg)
	{
	char dsname[MAXNAMELEN];
	zvol_task_t *task;
	uint64_t snapdev;

	dsl_dataset_name(ds, dsname);
	if (dsl_prop_get_int_ds(ds, "snapdev", &snapdev) != 0)
	return (0);
	task = zvol_task_alloc(ZVOL_ASYNC_SET_SNAPDEV, dsname, NULL, snapdev);
	if (task == NULL)
	return (0);

	(void) taskq_dispatch(dp->dp_spa->spa_zvol_taskq, zvol_task_cb,
	task, TQ_SLEEP);
	return (0);
	}

	/*
	* Traverse all child datasets and apply snapdev appropriately.
	* We call dsl_prop_set_sync_impl() here to set the value only on the toplevel
	* dataset and read the effective "snapdev" on every child in the callback
	* function: this is because the value is not guaranteed to be the same in the
	* whole dataset hierarchy.
	*/
	static void
	zvol_set_snapdev_sync(void arg, dmu_tx_t tx)
	{
	zvol_set_prop_int_arg_t *zsda = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dir_t *dd;
	dsl_dataset_t *ds;
	int error;

	VERIFY0(dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL));
	zsda->zsda_tx = tx;

	error = dsl_dataset_hold(dp, zsda->zsda_name, FTAG, &ds);
	if (error == 0) {
	dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_SNAPDEV),
	zsda->zsda_source, sizeof (zsda->zsda_value), 1,
	&zsda->zsda_value, zsda->zsda_tx);
	dsl_dataset_rele(ds, FTAG);
	}
	dmu_objset_find_dp(dp, dd->dd_object, zvol_set_snapdev_sync_cb,
	zsda, DS_FIND_CHILDREN);

	dsl_dir_rele(dd, FTAG);
	}

	int
	zvol_set_snapdev(const char *ddname, zprop_source_t source, uint64_t snapdev)
	{
	zvol_set_prop_int_arg_t zsda;

	zsda.zsda_name = ddname;
	zsda.zsda_source = source;
	zsda.zsda_value = snapdev;

	return (dsl_sync_task(ddname, zvol_set_snapdev_check,
	zvol_set_snapdev_sync, &zsda, 0, ZFS_SPACE_CHECK_NONE));
	}

	/*
	* Sanity check the dataset for safe use by the sync task. No additional
	* conditions are imposed.
	*/
	static int
	zvol_set_volmode_check(void arg, dmu_tx_t tx)
	{
	zvol_set_prop_int_arg_t *zsda = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dir_t *dd;
	int error;

	error = dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL);
	if (error != 0)
	return (error);

	dsl_dir_rele(dd, FTAG);

	return (error);
	}

	/* ARGSUSED */
	static int
	zvol_set_volmode_sync_cb(dsl_pool_t dp, dsl_dataset_t ds, void *arg)
	{
	char dsname[MAXNAMELEN];
	zvol_task_t *task;
	uint64_t volmode;

	dsl_dataset_name(ds, dsname);
	if (dsl_prop_get_int_ds(ds, "volmode", &volmode) != 0)
	return (0);
	task = zvol_task_alloc(ZVOL_ASYNC_SET_VOLMODE, dsname, NULL, volmode);
	if (task == NULL)
	return (0);

	(void) taskq_dispatch(dp->dp_spa->spa_zvol_taskq, zvol_task_cb,
	task, TQ_SLEEP);
	return (0);
	}

	/*
	* Traverse all child datasets and apply volmode appropriately.
	* We call dsl_prop_set_sync_impl() here to set the value only on the toplevel
	* dataset and read the effective "volmode" on every child in the callback
	* function: this is because the value is not guaranteed to be the same in the
	* whole dataset hierarchy.
	*/
	static void
	zvol_set_volmode_sync(void arg, dmu_tx_t tx)
	{
	zvol_set_prop_int_arg_t *zsda = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	dsl_dir_t *dd;
	dsl_dataset_t *ds;
	int error;

	VERIFY0(dsl_dir_hold(dp, zsda->zsda_name, FTAG, &dd, NULL));
	zsda->zsda_tx = tx;

	error = dsl_dataset_hold(dp, zsda->zsda_name, FTAG, &ds);
	if (error == 0) {
	dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_VOLMODE),
	zsda->zsda_source, sizeof (zsda->zsda_value), 1,
	&zsda->zsda_value, zsda->zsda_tx);
	dsl_dataset_rele(ds, FTAG);
	}

	dmu_objset_find_dp(dp, dd->dd_object, zvol_set_volmode_sync_cb,
	zsda, DS_FIND_CHILDREN);

	dsl_dir_rele(dd, FTAG);
	}

	int
	zvol_set_volmode(const char *ddname, zprop_source_t source, uint64_t volmode)
	{
	zvol_set_prop_int_arg_t zsda;

	zsda.zsda_name = ddname;
	zsda.zsda_source = source;
	zsda.zsda_value = volmode;

	return (dsl_sync_task(ddname, zvol_set_volmode_check,
	zvol_set_volmode_sync, &zsda, 0, ZFS_SPACE_CHECK_NONE));
	}

	void
	zvol_remove_minors(spa_t spa, const char name, boolean_t async)
	{
	zvol_task_t *task;
	taskqid_t id;

	task = zvol_task_alloc(ZVOL_ASYNC_REMOVE_MINORS, name, NULL, ~0ULL);
	if (task == NULL)
	return;

	id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP);
	if ((async == B_FALSE) && (id != TASKQID_INVALID))
	taskq_wait_id(spa->spa_zvol_taskq, id);
	}

	void
	zvol_rename_minors(spa_t spa, const char name1, const char *name2,
	boolean_t async)
	{
	zvol_task_t *task;
	taskqid_t id;

	task = zvol_task_alloc(ZVOL_ASYNC_RENAME_MINORS, name1, name2, ~0ULL);
	if (task == NULL)
	return;

	id = taskq_dispatch(spa->spa_zvol_taskq, zvol_task_cb, task, TQ_SLEEP);
	if ((async == B_FALSE) && (id != TASKQID_INVALID))
	taskq_wait_id(spa->spa_zvol_taskq, id);
	}

	boolean_t
	zvol_is_zvol(const char *name)
	{

	return (ops->zv_is_zvol(name));
	}

	void
	zvol_register_ops(const zvol_platform_ops_t *zvol_ops)
	{
	ops = zvol_ops;
	}

	int
	zvol_init_impl(void)
	{
	int i;

	list_create(&zvol_state_list, sizeof (zvol_state_t),
	offsetof(zvol_state_t, zv_next));
	rw_init(&zvol_state_lock, NULL, RW_DEFAULT, NULL);

	zvol_htable = kmem_alloc(ZVOL_HT_SIZE * sizeof (struct hlist_head),
	KM_SLEEP);
	for (i = 0; i < ZVOL_HT_SIZE; i++)
	INIT_HLIST_HEAD(&zvol_htable[i]);

	return (0);
	}

	void
	zvol_fini_impl(void)
	{
	zvol_remove_minors_impl(NULL);

	/*
	* The call to "zvol_remove_minors_impl" may dispatch entries to
	* the system_taskq, but it doesn't wait for those entries to
	* complete before it returns. Thus, we must wait for all of the
	* removals to finish, before we can continue.
	*/
	taskq_wait_outstanding(system_taskq, 0);

	kmem_free(zvol_htable, ZVOL_HT_SIZE * sizeof (struct hlist_head));
	list_destroy(&zvol_state_list);
	rw_destroy(&zvol_state_lock);
	}
	diff --git a/sys/contrib/openzfs/module/zstd/Makefile.in b/sys/contrib/openzfs/module/zstd/Makefile.in
	index f67db710f097..091f7cea3639 100644
	--- a/sys/contrib/openzfs/module/zstd/Makefile.in
	+++ b/sys/contrib/openzfs/module/zstd/Makefile.in
	@@ -1,38 +1,39 @@
	ifneq ($(KBUILD_EXTMOD),)
	src = @abs_srcdir@
	obj = @abs_builddir@
	zstd_include = $(src)/include
	else
	zstd_include = $(srctree)/$(src)/include
	endif

	MODULE := zzstd

	obj-$(CONFIG_ZFS) := $(MODULE).o

	asflags-y := -I$(zstd_include)
	ccflags-y := -I$(zstd_include)

	# Zstd uses -O3 by default, so we should follow
	ccflags-y += -O3

	# -fno-tree-vectorize gets set for gcc in zstd/common/compiler.h
	# Set it for other compilers, too.
	$(obj)/lib/zstd.o: c_flags += -fno-tree-vectorize

	# SSE register return with SSE disabled if -march=znverX is passed
	$(obj)/lib/zstd.o: c_flags += -U__BMI__

	# Quiet warnings about frame size due to unused code in unmodified zstd lib
	$(obj)/lib/zstd.o: c_flags += -Wframe-larger-than=20480

	# Disable aarch64 neon SIMD instructions for kernel mode
	$(obj)/lib/zstd.o: c_flags += -include $(zstd_include)/aarch64_compat.h -include $(zstd_include)/zstd_compat_wrapper.h -Wp,-w

	$(obj)/zfs_zstd.o: c_flags += -include $(zstd_include)/zstd_compat_wrapper.h

	$(MODULE)-objs += zfs_zstd.o
	$(MODULE)-objs += lib/zstd.o
	+$(MODULE)-objs += zstd_sparc.o

	all:
	mkdir -p lib
	diff --git a/sys/contrib/openzfs/module/zstd/include/sparc_compat.h b/sys/contrib/openzfs/module/zstd/include/sparc_compat.h
	new file mode 100644
	index 000000000000..14c1bdde917c
	--- /dev/null
	+++ b/sys/contrib/openzfs/module/zstd/include/sparc_compat.h
	@@ -0,0 +1,4 @@
	+#if defined(__sparc)
	+uint64_t __bswapdi2(uint64_t in);
	+uint32_t __bswapsi2(uint32_t in);
	+#endif
	diff --git a/sys/contrib/openzfs/module/zstd/zfs_zstd.c b/sys/contrib/openzfs/module/zstd/zfs_zstd.c
	index 3f3983d8d868..7b3eb52574df 100644
	--- a/sys/contrib/openzfs/module/zstd/zfs_zstd.c
	+++ b/sys/contrib/openzfs/module/zstd/zfs_zstd.c
	@@ -1,799 +1,801 @@
	/*
	* BSD 3-Clause New License (https://spdx.org/licenses/BSD-3-Clause.html)
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* 3. Neither the name of the copyright holder nor the names of its
	* contributors may be used to endorse or promote products derived from this
	* software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*/

	/*
	* Copyright (c) 2016-2018, Klara Inc.
	* Copyright (c) 2016-2018, Allan Jude
	* Copyright (c) 2018-2020, Sebastian Gottschall
	* Copyright (c) 2019-2020, Michael Niewöhner
	* Copyright (c) 2020, The FreeBSD Foundation [1]
	*
	* [1] Portions of this software were developed by Allan Jude
	* under sponsorship from the FreeBSD Foundation.
	*/

	#include <sys/param.h>
	#include <sys/sysmacros.h>
	#include <sys/zfs_context.h>
	#include <sys/zio_compress.h>
	#include <sys/spa.h>
	#include <sys/zstd/zstd.h>

	#define ZSTD_STATIC_LINKING_ONLY
	#include "lib/zstd.h"
	#include "lib/zstd_errors.h"

	kstat_t *zstd_ksp = NULL;

	typedef struct zstd_stats {
	kstat_named_t zstd_stat_alloc_fail;
	kstat_named_t zstd_stat_alloc_fallback;
	kstat_named_t zstd_stat_com_alloc_fail;
	kstat_named_t zstd_stat_dec_alloc_fail;
	kstat_named_t zstd_stat_com_inval;
	kstat_named_t zstd_stat_dec_inval;
	kstat_named_t zstd_stat_dec_header_inval;
	kstat_named_t zstd_stat_com_fail;
	kstat_named_t zstd_stat_dec_fail;
	kstat_named_t zstd_stat_buffers;
	kstat_named_t zstd_stat_size;
	} zstd_stats_t;

	static zstd_stats_t zstd_stats = {
	{ "alloc_fail", KSTAT_DATA_UINT64 },
	{ "alloc_fallback", KSTAT_DATA_UINT64 },
	{ "compress_alloc_fail", KSTAT_DATA_UINT64 },
	{ "decompress_alloc_fail", KSTAT_DATA_UINT64 },
	{ "compress_level_invalid", KSTAT_DATA_UINT64 },
	{ "decompress_level_invalid", KSTAT_DATA_UINT64 },
	{ "decompress_header_invalid", KSTAT_DATA_UINT64 },
	{ "compress_failed", KSTAT_DATA_UINT64 },
	{ "decompress_failed", KSTAT_DATA_UINT64 },
	{ "buffers", KSTAT_DATA_UINT64 },
	{ "size", KSTAT_DATA_UINT64 },
	};

	/* Enums describing the allocator type specified by kmem_type in zstd_kmem */
	enum zstd_kmem_type {
	ZSTD_KMEM_UNKNOWN = 0,
	/* Allocation type using kmem_vmalloc */
	ZSTD_KMEM_DEFAULT,
	/* Pool based allocation using mempool_alloc */
	ZSTD_KMEM_POOL,
	/* Reserved fallback memory for decompression only */
	ZSTD_KMEM_DCTX,
	ZSTD_KMEM_COUNT,
	};

	/* Structure for pooled memory objects */
	struct zstd_pool {
	void *mem;
	size_t size;
	kmutex_t barrier;
	hrtime_t timeout;
	};

	/* Global structure for handling memory allocations */
	struct zstd_kmem {
	enum zstd_kmem_type kmem_type;
	size_t kmem_size;
	struct zstd_pool *pool;
	};

	/* Fallback memory structure used for decompression only if memory runs out */
	struct zstd_fallback_mem {
	size_t mem_size;
	void *mem;
	kmutex_t barrier;
	};

	struct zstd_levelmap {
	int16_t zstd_level;
	enum zio_zstd_levels level;
	};

	/*
	* ZSTD memory handlers
	*
	* For decompression we use a different handler which also provides fallback
	* memory allocation in case memory runs out.
	*
	* The ZSTD handlers were split up for the most simplified implementation.
	*/
	static void zstd_alloc(void opaque, size_t size);
	static void zstd_dctx_alloc(void opaque, size_t size);
	static void zstd_free(void opaque, void ptr);

	/* Compression memory handler */
	static const ZSTD_customMem zstd_malloc = {
	zstd_alloc,
	zstd_free,
	NULL,
	};

	/* Decompression memory handler */
	static const ZSTD_customMem zstd_dctx_malloc = {
	zstd_dctx_alloc,
	zstd_free,
	NULL,
	};

	/* Level map for converting ZFS internal levels to ZSTD levels and vice versa */
	static struct zstd_levelmap zstd_levels[] = {
	{ZIO_ZSTD_LEVEL_1, ZIO_ZSTD_LEVEL_1},
	{ZIO_ZSTD_LEVEL_2, ZIO_ZSTD_LEVEL_2},
	{ZIO_ZSTD_LEVEL_3, ZIO_ZSTD_LEVEL_3},
	{ZIO_ZSTD_LEVEL_4, ZIO_ZSTD_LEVEL_4},
	{ZIO_ZSTD_LEVEL_5, ZIO_ZSTD_LEVEL_5},
	{ZIO_ZSTD_LEVEL_6, ZIO_ZSTD_LEVEL_6},
	{ZIO_ZSTD_LEVEL_7, ZIO_ZSTD_LEVEL_7},
	{ZIO_ZSTD_LEVEL_8, ZIO_ZSTD_LEVEL_8},
	{ZIO_ZSTD_LEVEL_9, ZIO_ZSTD_LEVEL_9},
	{ZIO_ZSTD_LEVEL_10, ZIO_ZSTD_LEVEL_10},
	{ZIO_ZSTD_LEVEL_11, ZIO_ZSTD_LEVEL_11},
	{ZIO_ZSTD_LEVEL_12, ZIO_ZSTD_LEVEL_12},
	{ZIO_ZSTD_LEVEL_13, ZIO_ZSTD_LEVEL_13},
	{ZIO_ZSTD_LEVEL_14, ZIO_ZSTD_LEVEL_14},
	{ZIO_ZSTD_LEVEL_15, ZIO_ZSTD_LEVEL_15},
	{ZIO_ZSTD_LEVEL_16, ZIO_ZSTD_LEVEL_16},
	{ZIO_ZSTD_LEVEL_17, ZIO_ZSTD_LEVEL_17},
	{ZIO_ZSTD_LEVEL_18, ZIO_ZSTD_LEVEL_18},
	{ZIO_ZSTD_LEVEL_19, ZIO_ZSTD_LEVEL_19},
	{-1, ZIO_ZSTD_LEVEL_FAST_1},
	{-2, ZIO_ZSTD_LEVEL_FAST_2},
	{-3, ZIO_ZSTD_LEVEL_FAST_3},
	{-4, ZIO_ZSTD_LEVEL_FAST_4},
	{-5, ZIO_ZSTD_LEVEL_FAST_5},
	{-6, ZIO_ZSTD_LEVEL_FAST_6},
	{-7, ZIO_ZSTD_LEVEL_FAST_7},
	{-8, ZIO_ZSTD_LEVEL_FAST_8},
	{-9, ZIO_ZSTD_LEVEL_FAST_9},
	{-10, ZIO_ZSTD_LEVEL_FAST_10},
	{-20, ZIO_ZSTD_LEVEL_FAST_20},
	{-30, ZIO_ZSTD_LEVEL_FAST_30},
	{-40, ZIO_ZSTD_LEVEL_FAST_40},
	{-50, ZIO_ZSTD_LEVEL_FAST_50},
	{-60, ZIO_ZSTD_LEVEL_FAST_60},
	{-70, ZIO_ZSTD_LEVEL_FAST_70},
	{-80, ZIO_ZSTD_LEVEL_FAST_80},
	{-90, ZIO_ZSTD_LEVEL_FAST_90},
	{-100, ZIO_ZSTD_LEVEL_FAST_100},
	{-500, ZIO_ZSTD_LEVEL_FAST_500},
	{-1000, ZIO_ZSTD_LEVEL_FAST_1000},
	};

	/*
	* This variable represents the maximum count of the pool based on the number
	* of CPUs plus some buffer. We default to cpu count * 4, see init_zstd.
	*/
	static int pool_count = 16;

	#define ZSTD_POOL_MAX pool_count
	#define ZSTD_POOL_TIMEOUT 60 * 2

	static struct zstd_fallback_mem zstd_dctx_fallback;
	static struct zstd_pool *zstd_mempool_cctx;
	static struct zstd_pool *zstd_mempool_dctx;

	/*
	* The library zstd code expects these if ADDRESS_SANITIZER gets defined,
	* and while ASAN does this, KASAN defines that and does not. So to avoid
	* changing the external code, we do this.
	*/
	#if defined(__has_feature)
	#if __has_feature(address_sanitizer)
	#define ADDRESS_SANITIZER 1
	#endif
	#elif defined(__SANITIZE_ADDRESS__)
	#define ADDRESS_SANITIZER 1
	#endif
	#if defined(_KERNEL) && defined(ADDRESS_SANITIZER)
	void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
	void __asan_poison_memory_region(void const volatile *addr, size_t size);
	void __asan_unpoison_memory_region(void const volatile *addr, size_t size) {};
	void __asan_poison_memory_region(void const volatile *addr, size_t size) {};
	#endif


	static void
	zstd_mempool_reap(struct zstd_pool *zstd_mempool)
	{
	struct zstd_pool *pool;

	if (!zstd_mempool \|\| !ZSTDSTAT(zstd_stat_buffers)) {
	return;
	}

	/* free obsolete slots */
	for (int i = 0; i < ZSTD_POOL_MAX; i++) {
	pool = &zstd_mempool[i];
	if (pool->mem && mutex_tryenter(&pool->barrier)) {
	/* Free memory if unused object older than 2 minutes */
	if (pool->mem && gethrestime_sec() > pool->timeout) {
	vmem_free(pool->mem, pool->size);
	ZSTDSTAT_SUB(zstd_stat_buffers, 1);
	ZSTDSTAT_SUB(zstd_stat_size, pool->size);
	pool->mem = NULL;
	pool->size = 0;
	pool->timeout = 0;
	}
	mutex_exit(&pool->barrier);
	}
	}
	}

	/*
	* Try to get a cached allocated buffer from memory pool or allocate a new one
	* if necessary. If a object is older than 2 minutes and does not fit the
	* requested size, it will be released and a new cached entry will be allocated.
	* If other pooled objects are detected without being used for 2 minutes, they
	* will be released, too.
	*
	* The concept is that high frequency memory allocations of bigger objects are
	* expensive. So if a lot of work is going on, allocations will be kept for a
	* while and can be reused in that time frame.
	*
	* The scheduled release will be updated every time a object is reused.
	*/

	static void *
	zstd_mempool_alloc(struct zstd_pool *zstd_mempool, size_t size)
	{
	struct zstd_pool *pool;
	struct zstd_kmem *mem = NULL;

	if (!zstd_mempool) {
	return (NULL);
	}

	/* Seek for preallocated memory slot and free obsolete slots */
	for (int i = 0; i < ZSTD_POOL_MAX; i++) {
	pool = &zstd_mempool[i];
	/*
	* This lock is simply a marker for a pool object being in use.
	* If it's already hold, it will be skipped.
	*
	* We need to create it before checking it to avoid race
	* conditions caused by running in a threaded context.
	*
	* The lock is later released by zstd_mempool_free.
	*/
	if (mutex_tryenter(&pool->barrier)) {
	/*
	* Check if objects fits the size, if so we take it and
	* update the timestamp.
	*/
	if (pool->mem && size <= pool->size) {
	pool->timeout = gethrestime_sec() +
	ZSTD_POOL_TIMEOUT;
	mem = pool->mem;
	return (mem);
	}
	mutex_exit(&pool->barrier);
	}
	}

	/*
	* If no preallocated slot was found, try to fill in a new one.
	*
	* We run a similar algorithm twice here to avoid pool fragmentation.
	* The first one may generate holes in the list if objects get released.
	* We always make sure that these holes get filled instead of adding new
	* allocations constantly at the end.
	*/
	for (int i = 0; i < ZSTD_POOL_MAX; i++) {
	pool = &zstd_mempool[i];
	if (mutex_tryenter(&pool->barrier)) {
	/* Object is free, try to allocate new one */
	if (!pool->mem) {
	mem = vmem_alloc(size, KM_SLEEP);
	if (mem) {
	ZSTDSTAT_ADD(zstd_stat_buffers, 1);
	ZSTDSTAT_ADD(zstd_stat_size, size);
	pool->mem = mem;
	pool->size = size;
	/* Keep track for later release */
	mem->pool = pool;
	mem->kmem_type = ZSTD_KMEM_POOL;
	mem->kmem_size = size;
	}
	}

	if (size <= pool->size) {
	/* Update timestamp */
	pool->timeout = gethrestime_sec() +
	ZSTD_POOL_TIMEOUT;

	return (pool->mem);
	}

	mutex_exit(&pool->barrier);
	}
	}

	/*
	* If the pool is full or the allocation failed, try lazy allocation
	* instead.
	*/
	if (!mem) {
	mem = vmem_alloc(size, KM_NOSLEEP);
	if (mem) {
	mem->pool = NULL;
	mem->kmem_type = ZSTD_KMEM_DEFAULT;
	mem->kmem_size = size;
	}
	}

	return (mem);
	}

	/* Mark object as released by releasing the barrier mutex */
	static void
	zstd_mempool_free(struct zstd_kmem *z)
	{
	mutex_exit(&z->pool->barrier);
	}

	/* Convert ZFS internal enum to ZSTD level */
	static int
	zstd_enum_to_level(enum zio_zstd_levels level, int16_t *zstd_level)
	{
	if (level > 0 && level <= ZIO_ZSTD_LEVEL_19) {
	*zstd_level = zstd_levels[level - 1].zstd_level;
	return (0);
	}
	if (level >= ZIO_ZSTD_LEVEL_FAST_1 &&
	level <= ZIO_ZSTD_LEVEL_FAST_1000) {
	*zstd_level = zstd_levels[level - ZIO_ZSTD_LEVEL_FAST_1
	+ ZIO_ZSTD_LEVEL_19].zstd_level;
	return (0);
	}

	/* Invalid/unknown zfs compression enum - this should never happen. */
	return (1);
	}

	+
	/* Compress block using zstd */
	size_t
	zfs_zstd_compress(void s_start, void d_start, size_t s_len, size_t d_len,
	int level)
	{
	size_t c_len;
	int16_t zstd_level;
	zfs_zstdhdr_t *hdr;
	ZSTD_CCtx *cctx;

	hdr = (zfs_zstdhdr_t *)d_start;

	/* Skip compression if the specified level is invalid */
	if (zstd_enum_to_level(level, &zstd_level)) {
	ZSTDSTAT_BUMP(zstd_stat_com_inval);
	return (s_len);
	}

	ASSERT3U(d_len, >=, sizeof (*hdr));
	ASSERT3U(d_len, <=, s_len);
	ASSERT3U(zstd_level, !=, 0);

	cctx = ZSTD_createCCtx_advanced(zstd_malloc);

	/*
	* Out of kernel memory, gently fall through - this will disable
	* compression in zio_compress_data
	*/
	if (!cctx) {
	ZSTDSTAT_BUMP(zstd_stat_com_alloc_fail);
	return (s_len);
	}

	/* Set the compression level */
	ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, zstd_level);

	/* Use the "magicless" zstd header which saves us 4 header bytes */
	ZSTD_CCtx_setParameter(cctx, ZSTD_c_format, ZSTD_f_zstd1_magicless);

	/*
	* Disable redundant checksum calculation and content size storage since
	* this is already done by ZFS itself.
	*/
	ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 0);
	ZSTD_CCtx_setParameter(cctx, ZSTD_c_contentSizeFlag, 0);

	c_len = ZSTD_compress2(cctx,
	hdr->data,
	d_len - sizeof (*hdr),
	s_start, s_len);

	ZSTD_freeCCtx(cctx);

	/* Error in the compression routine, disable compression. */
	if (ZSTD_isError(c_len)) {
	/*
	* If we are aborting the compression because the saves are
	* too small, that is not a failure. Everything else is a
	* failure, so increment the compression failure counter.
	*/
	if (ZSTD_getErrorCode(c_len) != ZSTD_error_dstSize_tooSmall) {
	ZSTDSTAT_BUMP(zstd_stat_com_fail);
	}
	return (s_len);
	}

	/*
	* Encode the compressed buffer size at the start. We'll need this in
	* decompression to counter the effects of padding which might be added
	* to the compressed buffer and which, if unhandled, would confuse the
	* hell out of our decompression function.
	*/
	hdr->c_len = BE_32(c_len);

	/*
	* Check version for overflow.
	* The limit of 24 bits must not be exceeded. This allows a maximum
	* version 1677.72.15 which we don't expect to be ever reached.
	*/
	ASSERT3U(ZSTD_VERSION_NUMBER, <=, 0xFFFFFF);

	/*
	* Encode the compression level as well. We may need to know the
	* original compression level if compressed_arc is disabled, to match
	* the compression settings to write this block to the L2ARC.
	*
	* Encode the actual level, so if the enum changes in the future, we
	* will be compatible.
	*
	* The upper 24 bits store the ZSTD version to be able to provide
	* future compatibility, since new versions might enhance the
	* compression algorithm in a way, where the compressed data will
	* change.
	*
	* As soon as such incompatibility occurs, handling code needs to be
	* added, differentiating between the versions.
	*/
	- hdr->version = ZSTD_VERSION_NUMBER;
	- hdr->level = level;
	+ zfs_set_hdrversion(hdr, ZSTD_VERSION_NUMBER);
	+ zfs_set_hdrlevel(hdr, level);
	hdr->raw_version_level = BE_32(hdr->raw_version_level);

	return (c_len + sizeof (*hdr));
	}

	/* Decompress block using zstd and return its stored level */
	int
	zfs_zstd_decompress_level(void s_start, void d_start, size_t s_len,
	size_t d_len, uint8_t *level)
	{
	ZSTD_DCtx *dctx;
	size_t result;
	int16_t zstd_level;
	uint32_t c_len;
	const zfs_zstdhdr_t *hdr;
	zfs_zstdhdr_t hdr_copy;

	hdr = (const zfs_zstdhdr_t *)s_start;
	c_len = BE_32(hdr->c_len);

	/*
	* Make a copy instead of directly converting the header, since we must
	* not modify the original data that may be used again later.
	*/
	hdr_copy.raw_version_level = BE_32(hdr->raw_version_level);
	+ uint8_t curlevel = zfs_get_hdrlevel(&hdr_copy);

	/*
	* NOTE: We ignore the ZSTD version for now. As soon as any
	* incompatibility occurs, it has to be handled accordingly.
	* The version can be accessed via `hdr_copy.version`.
	*/

	/*
	* Convert and check the level
	* An invalid level is a strong indicator for data corruption! In such
	* case return an error so the upper layers can try to fix it.
	*/
	- if (zstd_enum_to_level(hdr_copy.level, &zstd_level)) {
	+ if (zstd_enum_to_level(curlevel, &zstd_level)) {
	ZSTDSTAT_BUMP(zstd_stat_dec_inval);
	return (1);
	}

	ASSERT3U(d_len, >=, s_len);
	- ASSERT3U(hdr_copy.level, !=, ZIO_COMPLEVEL_INHERIT);
	+ ASSERT3U(curlevel, !=, ZIO_COMPLEVEL_INHERIT);

	/* Invalid compressed buffer size encoded at start */
	if (c_len + sizeof (*hdr) > s_len) {
	ZSTDSTAT_BUMP(zstd_stat_dec_header_inval);
	return (1);
	}

	dctx = ZSTD_createDCtx_advanced(zstd_dctx_malloc);
	if (!dctx) {
	ZSTDSTAT_BUMP(zstd_stat_dec_alloc_fail);
	return (1);
	}

	/* Set header type to "magicless" */
	ZSTD_DCtx_setParameter(dctx, ZSTD_d_format, ZSTD_f_zstd1_magicless);

	/* Decompress the data and release the context */
	result = ZSTD_decompressDCtx(dctx, d_start, d_len, hdr->data, c_len);
	ZSTD_freeDCtx(dctx);

	/*
	* Returns 0 on success (decompression function returned non-negative)
	* and non-zero on failure (decompression function returned negative.
	*/
	if (ZSTD_isError(result)) {
	ZSTDSTAT_BUMP(zstd_stat_dec_fail);
	return (1);
	}

	if (level) {
	- *level = hdr_copy.level;
	+ *level = curlevel;
	}

	return (0);
	}

	/* Decompress datablock using zstd */
	int
	zfs_zstd_decompress(void s_start, void d_start, size_t s_len, size_t d_len,
	int level __maybe_unused)
	{

	return (zfs_zstd_decompress_level(s_start, d_start, s_len, d_len,
	NULL));
	}

	/* Allocator for zstd compression context using mempool_allocator */
	static void *
	zstd_alloc(void *opaque __maybe_unused, size_t size)
	{
	size_t nbytes = sizeof (struct zstd_kmem) + size;
	struct zstd_kmem *z = NULL;

	z = (struct zstd_kmem *)zstd_mempool_alloc(zstd_mempool_cctx, nbytes);

	if (!z) {
	ZSTDSTAT_BUMP(zstd_stat_alloc_fail);
	return (NULL);
	}

	return ((void*)z + (sizeof (struct zstd_kmem)));
	}

	/*
	* Allocator for zstd decompression context using mempool_allocator with
	* fallback to reserved memory if allocation fails
	*/
	static void *
	zstd_dctx_alloc(void *opaque __maybe_unused, size_t size)
	{
	size_t nbytes = sizeof (struct zstd_kmem) + size;
	struct zstd_kmem *z = NULL;
	enum zstd_kmem_type type = ZSTD_KMEM_DEFAULT;

	z = (struct zstd_kmem *)zstd_mempool_alloc(zstd_mempool_dctx, nbytes);
	if (!z) {
	/* Try harder, decompression shall not fail */
	z = vmem_alloc(nbytes, KM_SLEEP);
	if (z) {
	z->pool = NULL;
	}
	ZSTDSTAT_BUMP(zstd_stat_alloc_fail);
	} else {
	return ((void*)z + (sizeof (struct zstd_kmem)));
	}

	/* Fallback if everything fails */
	if (!z) {
	/*
	* Barrier since we only can handle it in a single thread. All
	* other following threads need to wait here until decompression
	* is completed. zstd_free will release this barrier later.
	*/
	mutex_enter(&zstd_dctx_fallback.barrier);

	z = zstd_dctx_fallback.mem;
	type = ZSTD_KMEM_DCTX;
	ZSTDSTAT_BUMP(zstd_stat_alloc_fallback);
	}

	/* Allocation should always be successful */
	if (!z) {
	return (NULL);
	}

	z->kmem_type = type;
	z->kmem_size = nbytes;

	return ((void*)z + (sizeof (struct zstd_kmem)));
	}

	/* Free allocated memory by its specific type */
	static void
	zstd_free(void opaque __maybe_unused, void ptr)
	{
	struct zstd_kmem *z = (ptr - sizeof (struct zstd_kmem));
	enum zstd_kmem_type type;

	ASSERT3U(z->kmem_type, <, ZSTD_KMEM_COUNT);
	ASSERT3U(z->kmem_type, >, ZSTD_KMEM_UNKNOWN);

	type = z->kmem_type;
	switch (type) {
	case ZSTD_KMEM_DEFAULT:
	vmem_free(z, z->kmem_size);
	break;
	case ZSTD_KMEM_POOL:
	zstd_mempool_free(z);
	break;
	case ZSTD_KMEM_DCTX:
	mutex_exit(&zstd_dctx_fallback.barrier);
	break;
	default:
	break;
	}
	}

	/* Allocate fallback memory to ensure safe decompression */
	static void __init
	create_fallback_mem(struct zstd_fallback_mem *mem, size_t size)
	{
	mem->mem_size = size;
	mem->mem = vmem_zalloc(mem->mem_size, KM_SLEEP);
	mutex_init(&mem->barrier, NULL, MUTEX_DEFAULT, NULL);
	}

	/* Initialize memory pool barrier mutexes */
	static void __init
	zstd_mempool_init(void)
	{
	zstd_mempool_cctx = (struct zstd_pool *)
	kmem_zalloc(ZSTD_POOL_MAX * sizeof (struct zstd_pool), KM_SLEEP);
	zstd_mempool_dctx = (struct zstd_pool *)
	kmem_zalloc(ZSTD_POOL_MAX * sizeof (struct zstd_pool), KM_SLEEP);

	for (int i = 0; i < ZSTD_POOL_MAX; i++) {
	mutex_init(&zstd_mempool_cctx[i].barrier, NULL,
	MUTEX_DEFAULT, NULL);
	mutex_init(&zstd_mempool_dctx[i].barrier, NULL,
	MUTEX_DEFAULT, NULL);
	}
	}

	/* Initialize zstd-related memory handling */
	static int __init
	zstd_meminit(void)
	{
	zstd_mempool_init();

	/*
	* Estimate the size of the fallback decompression context.
	* The expected size on x64 with current ZSTD should be about 160 KB.
	*/
	create_fallback_mem(&zstd_dctx_fallback,
	P2ROUNDUP(ZSTD_estimateDCtxSize() + sizeof (struct zstd_kmem),
	PAGESIZE));

	return (0);
	}

	/* Release object from pool and free memory */
	static void __exit
	release_pool(struct zstd_pool *pool)
	{
	mutex_destroy(&pool->barrier);
	vmem_free(pool->mem, pool->size);
	pool->mem = NULL;
	pool->size = 0;
	}

	/* Release memory pool objects */
	static void __exit
	zstd_mempool_deinit(void)
	{
	for (int i = 0; i < ZSTD_POOL_MAX; i++) {
	release_pool(&zstd_mempool_cctx[i]);
	release_pool(&zstd_mempool_dctx[i]);
	}

	kmem_free(zstd_mempool_dctx, ZSTD_POOL_MAX * sizeof (struct zstd_pool));
	kmem_free(zstd_mempool_cctx, ZSTD_POOL_MAX * sizeof (struct zstd_pool));
	zstd_mempool_dctx = NULL;
	zstd_mempool_cctx = NULL;
	}

	/* release unused memory from pool */

	void
	zfs_zstd_cache_reap_now(void)
	{

	/*
	* Short-circuit if there are no buffers to begin with.
	*/
	if (ZSTDSTAT(zstd_stat_buffers) == 0)
	return;

	/*
	* calling alloc with zero size seeks
	* and releases old unused objects
	*/
	zstd_mempool_reap(zstd_mempool_cctx);
	zstd_mempool_reap(zstd_mempool_dctx);
	}

	extern int __init
	zstd_init(void)
	{
	/* Set pool size by using maximum sane thread count * 4 */
	pool_count = (boot_ncpus * 4);
	zstd_meminit();

	/* Initialize kstat */
	zstd_ksp = kstat_create("zfs", 0, "zstd", "misc",
	KSTAT_TYPE_NAMED, sizeof (zstd_stats) / sizeof (kstat_named_t),
	KSTAT_FLAG_VIRTUAL);
	if (zstd_ksp != NULL) {
	zstd_ksp->ks_data = &zstd_stats;
	kstat_install(zstd_ksp);
	}

	return (0);
	}

	extern void __exit
	zstd_fini(void)
	{
	/* Deinitialize kstat */
	if (zstd_ksp != NULL) {
	kstat_delete(zstd_ksp);
	zstd_ksp = NULL;
	}

	/* Release fallback memory */
	vmem_free(zstd_dctx_fallback.mem, zstd_dctx_fallback.mem_size);
	mutex_destroy(&zstd_dctx_fallback.barrier);

	/* Deinit memory pool */
	zstd_mempool_deinit();
	}

	#if defined(_KERNEL)
	module_init(zstd_init);
	module_exit(zstd_fini);

	ZFS_MODULE_DESCRIPTION("ZSTD Compression for ZFS");
	ZFS_MODULE_LICENSE("Dual BSD/GPL");
	-ZFS_MODULE_VERSION(ZSTD_VERSION_STRING);
	+ZFS_MODULE_VERSION(ZSTD_VERSION_STRING "a");

	EXPORT_SYMBOL(zfs_zstd_compress);
	EXPORT_SYMBOL(zfs_zstd_decompress_level);
	EXPORT_SYMBOL(zfs_zstd_decompress);
	EXPORT_SYMBOL(zfs_zstd_cache_reap_now);
	#endif
	diff --git a/sys/contrib/openzfs/module/zstd/zstd_sparc.c b/sys/contrib/openzfs/module/zstd/zstd_sparc.c
	new file mode 100644
	index 000000000000..463df99bd7e3
	--- /dev/null
	+++ b/sys/contrib/openzfs/module/zstd/zstd_sparc.c
	@@ -0,0 +1,11 @@
	+#ifdef __sparc__
	+#include <stdint.h>
	+#include <sys/byteorder.h>
	+#include "include/sparc_compat.h"
	+uint64_t __bswapdi2(uint64_t in) {
	+ return (BSWAP_64(in));
	+}
	+uint32_t __bswapsi2(uint32_t in) {
	+ return (BSWAP_32(in));
	+}
	+#endif
	diff --git a/sys/contrib/openzfs/scripts/zfs-tests.sh b/sys/contrib/openzfs/scripts/zfs-tests.sh
	index edb9c9f106c2..ac28788582f9 100755
	--- a/sys/contrib/openzfs/scripts/zfs-tests.sh
	+++ b/sys/contrib/openzfs/scripts/zfs-tests.sh
	@@ -1,705 +1,716 @@
	#!/bin/sh
	#
	# CDDL HEADER START
	#
	# The contents of this file are subject to the terms of the
	# Common Development and Distribution License, Version 1.0 only
	# (the "License"). You may not use this file except in compliance
	# with the License.
	#
	# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	# or http://www.opensolaris.org/os/licensing.
	# See the License for the specific language governing permissions
	# and limitations under the License.
	#
	# When distributing Covered Code, include this CDDL HEADER in each
	# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	# If applicable, add the following below this CDDL HEADER, with the
	# fields enclosed by brackets "[]" replaced with your own identifying
	# information: Portions Copyright [yyyy] [name of copyright owner]
	#
	# CDDL HEADER END
	#

	BASE_DIR=$(dirname "$0")
	SCRIPT_COMMON=common.sh
	if [ -f "${BASE_DIR}/${SCRIPT_COMMON}" ]; then
	. "${BASE_DIR}/${SCRIPT_COMMON}"
	else
	echo "Missing helper script ${SCRIPT_COMMON}" && exit 1
	fi

	PROG=zfs-tests.sh
	VERBOSE="no"
	QUIET=""
	CLEANUP="yes"
	CLEANUPALL="no"
	LOOPBACK="yes"
	STACK_TRACER="no"
	FILESIZE="4G"
	DEFAULT_RUNFILES="common.run,$(uname \| tr '[:upper:]' '[:lower:]').run"
	RUNFILES=${RUNFILES:-$DEFAULT_RUNFILES}
	FILEDIR=${FILEDIR:-/var/tmp}
	DISKS=${DISKS:-""}
	SINGLETEST=""
	SINGLETESTUSER="root"
	TAGS=""
	ITERATIONS=1
	ZFS_DBGMSG="$STF_SUITE/callbacks/zfs_dbgmsg.ksh"
	ZFS_DMESG="$STF_SUITE/callbacks/zfs_dmesg.ksh"
	UNAME=$(uname -s)

	# Override some defaults if on FreeBSD
	if [ "$UNAME" = "FreeBSD" ] ; then
	TESTFAIL_CALLBACKS=${TESTFAIL_CALLBACKS:-"$ZFS_DMESG"}
	LOSETUP=/sbin/mdconfig
	DMSETUP=/sbin/gpart
	else
	ZFS_MMP="$STF_SUITE/callbacks/zfs_mmp.ksh"
	TESTFAIL_CALLBACKS=${TESTFAIL_CALLBACKS:-"$ZFS_DBGMSG:$ZFS_DMESG:$ZFS_MMP"}
	LOSETUP=${LOSETUP:-/sbin/losetup}
	DMSETUP=${DMSETUP:-/sbin/dmsetup}
	fi

	#
	# Log an informational message when additional verbosity is enabled.
	#
	msg() {
	if [ "$VERBOSE" = "yes" ]; then
	echo "$@"
	fi
	}

	#
	# Log a failure message, cleanup, and return an error.
	#
	fail() {
	echo "$PROG: $1" >&2
	cleanup
	exit 1
	}

	cleanup_freebsd_loopback() {
	for TEST_LOOPBACK in ${LOOPBACKS}; do
	if [ -c "/dev/${TEST_LOOPBACK}" ]; then
	sudo "${LOSETUP}" -d -u "${TEST_LOOPBACK}" \|\|
	echo "Failed to destroy: ${TEST_LOOPBACK}"
	fi
	done
	}

	cleanup_linux_loopback() {
	for TEST_LOOPBACK in ${LOOPBACKS}; do
	LOOP_DEV=$(basename "$TEST_LOOPBACK")
	DM_DEV=$(sudo "${DMSETUP}" ls 2>/dev/null \| \
	grep "${LOOP_DEV}" \| cut -f1)

	if [ -n "$DM_DEV" ]; then
	sudo "${DMSETUP}" remove "${DM_DEV}" \|\|
	echo "Failed to remove: ${DM_DEV}"
	fi

	if [ -n "${TEST_LOOPBACK}" ]; then
	sudo "${LOSETUP}" -d "${TEST_LOOPBACK}" \|\|
	echo "Failed to remove: ${TEST_LOOPBACK}"
	fi
	done
	}

	#
	# Attempt to remove loopback devices and files which where created earlier
	# by this script to run the test framework. The '-k' option may be passed
	# to the script to suppress cleanup for debugging purposes.
	#
	cleanup() {
	if [ "$CLEANUP" = "no" ]; then
	return 0
	fi


	if [ "$LOOPBACK" = "yes" ]; then
	if [ "$UNAME" = "FreeBSD" ] ; then
	cleanup_freebsd_loopback
	else
	cleanup_linux_loopback
	fi
	fi

	for TEST_FILE in ${FILES}; do
	rm -f "${TEST_FILE}" >/dev/null 2>&1
	done

	if [ "$STF_PATH_REMOVE" = "yes" ] && [ -d "$STF_PATH" ]; then
	rm -Rf "$STF_PATH"
	fi
	}
	trap cleanup EXIT

	#
	# Attempt to remove all testpools (testpool.XXX), unopened dm devices,
	# loopback devices, and files. This is a useful way to cleanup a previous
	# test run failure which has left the system in an unknown state. This can
	# be dangerous and should only be used in a dedicated test environment.
	#
	cleanup_all() {
	TEST_POOLS=$(sudo "$ZPOOL" list -H -o name \| grep testpool)
	if [ "$UNAME" = "FreeBSD" ] ; then
	TEST_LOOPBACKS=$(sudo "${LOSETUP}" -l)
	else
	TEST_LOOPBACKS=$(sudo "${LOSETUP}" -a\|grep file-vdev\|cut -f1 -d:)
	fi
	TEST_FILES=$(ls /var/tmp/file-vdev* 2>/dev/null)

	msg
	msg "--- Cleanup ---"
	msg "Removing pool(s): $(echo "${TEST_POOLS}" \| tr '\n' ' ')"
	for TEST_POOL in $TEST_POOLS; do
	sudo "$ZPOOL" destroy "${TEST_POOL}"
	done

	if [ "$UNAME" != "FreeBSD" ] ; then
	msg "Removing dm(s): $(sudo "${DMSETUP}" ls \|
	grep loop \| tr '\n' ' ')"
	sudo "${DMSETUP}" remove_all
	fi

	msg "Removing loopback(s): $(echo "${TEST_LOOPBACKS}" \| tr '\n' ' ')"
	for TEST_LOOPBACK in $TEST_LOOPBACKS; do
	if [ "$UNAME" = "FreeBSD" ] ; then
	sudo "${LOSETUP}" -d -u "${TEST_LOOPBACK}"
	else
	sudo "${LOSETUP}" -d "${TEST_LOOPBACK}"
	fi
	done

	msg "Removing files(s): $(echo "${TEST_FILES}" \| tr '\n' ' ')"
	for TEST_FILE in $TEST_FILES; do
	sudo rm -f "${TEST_FILE}"
	done
	}

	#
	# Takes a name as the only arguments and looks for the following variations
	# on that name. If one is found it is returned.
	#
	# $RUNFILE_DIR/<name>
	# $RUNFILE_DIR/<name>.run
	# <name>
	# <name>.run
	#
	find_runfile() {
	NAME=$1
	RESULT=""

	if [ -f "$RUNFILE_DIR/$NAME" ]; then
	RESULT="$RUNFILE_DIR/$NAME"
	elif [ -f "$RUNFILE_DIR/$NAME.run" ]; then
	RESULT="$RUNFILE_DIR/$NAME.run"
	elif [ -f "$NAME" ]; then
	RESULT="$NAME"
	elif [ -f "$NAME.run" ]; then
	RESULT="$NAME.run"
	fi

	echo "$RESULT"
	}

	#
	# Symlink file if it appears under any of the given paths.
	#
	create_links() {
	dir_list="$1"
	file_list="$2"

	[ -n "$STF_PATH" ] \|\| fail "STF_PATH wasn't correctly set"

	for i in $file_list; do
	for j in $dir_list; do
	[ ! -e "$STF_PATH/$i" ] \|\| continue

	if [ ! -d "$j/$i" ] && [ -e "$j/$i" ]; then
	ln -sf "$j/$i" "$STF_PATH/$i" \|\| \
	fail "Couldn't link $i"
	break
	fi
	done

	[ ! -e "$STF_PATH/$i" ] && \
	STF_MISSING_BIN="$STF_MISSING_BIN $i"
	done
	STF_MISSING_BIN=${STF_MISSING_BIN# }
	}

	#
	# Constrain the path to limit the available binaries to a known set.
	# When running in-tree a top level ./bin/ directory is created for
	# convenience, otherwise a temporary directory is used.
	#
	constrain_path() {
	. "$STF_SUITE/include/commands.cfg"

	# On FreeBSD, base system zfs utils are in /sbin and OpenZFS utils
	# install to /usr/local/sbin. To avoid testing the wrong utils we
	# need /usr/local to come before / in the path search order.
	SYSTEM_DIRS="/usr/local/bin /usr/local/sbin"
	SYSTEM_DIRS="$SYSTEM_DIRS /usr/bin /usr/sbin /bin /sbin $LIBEXEC_DIR"

	if [ "$INTREE" = "yes" ]; then
	# Constrained path set to ./zfs/bin/
	STF_PATH="$BIN_DIR"
	STF_PATH_REMOVE="no"
	STF_MISSING_BIN=""
	if [ ! -d "$STF_PATH" ]; then
	mkdir "$STF_PATH"
	chmod 755 "$STF_PATH" \|\| fail "Couldn't chmod $STF_PATH"
	fi

	# Special case links for standard zfs utilities
	DIRS="$(find "$CMD_DIR" -type d \( ! -name .deps -a \
	! -name .libs \) -print \| tr '\n' ' ')"
	create_links "$DIRS" "$ZFS_FILES"

	# Special case links for zfs test suite utilities
	DIRS="$(find "$STF_SUITE" -type d \( ! -name .deps -a \
	! -name .libs \) -print \| tr '\n' ' ')"
	create_links "$DIRS" "$ZFSTEST_FILES"
	else
	# Constrained path set to /var/tmp/constrained_path.*
	SYSTEMDIR=${SYSTEMDIR:-/var/tmp/constrained_path.XXXXXX}
	STF_PATH=$(mktemp -d "$SYSTEMDIR")
	STF_PATH_REMOVE="yes"
	STF_MISSING_BIN=""

	chmod 755 "$STF_PATH" \|\| fail "Couldn't chmod $STF_PATH"

	# Special case links for standard zfs utilities
	create_links "$SYSTEM_DIRS" "$ZFS_FILES"

	# Special case links for zfs test suite utilities
	create_links "$STF_SUITE/bin" "$ZFSTEST_FILES"
	fi

	# Standard system utilities
	SYSTEM_FILES="$SYSTEM_FILES_COMMON"
	if [ "$UNAME" = "FreeBSD" ] ; then
	SYSTEM_FILES="$SYSTEM_FILES $SYSTEM_FILES_FREEBSD"
	else
	SYSTEM_FILES="$SYSTEM_FILES $SYSTEM_FILES_LINUX"
	fi
	create_links "$SYSTEM_DIRS" "$SYSTEM_FILES"

	# Exceptions
	ln -fs "$STF_PATH/awk" "$STF_PATH/nawk"
	if [ "$UNAME" = "Linux" ] ; then
	ln -fs /sbin/fsck.ext4 "$STF_PATH/fsck"
	ln -fs /sbin/mkfs.ext4 "$STF_PATH/newfs"
	ln -fs "$STF_PATH/gzip" "$STF_PATH/compress"
	ln -fs "$STF_PATH/gunzip" "$STF_PATH/uncompress"
	ln -fs "$STF_PATH/exportfs" "$STF_PATH/share"
	ln -fs "$STF_PATH/exportfs" "$STF_PATH/unshare"
	elif [ "$UNAME" = "FreeBSD" ] ; then
	ln -fs /usr/local/bin/ksh93 "$STF_PATH/ksh"
	fi
	}

	#
	# Output a useful usage message.
	#
	usage() {
	cat << EOF
	USAGE:
	$0 [-hvqxkfS] [-s SIZE] [-r RUNFILES] [-t PATH] [-u USER]

	DESCRIPTION:
	ZFS Test Suite launch script

	OPTIONS:
	-h Show this message
	-v Verbose zfs-tests.sh output
	-q Quiet test-runner output
	-x Remove all testpools, dm, lo, and files (unsafe)
	-k Disable cleanup after test failure
	-f Use files only, disables block device tests
	-S Enable stack tracer (negative performance impact)
	-c Only create and populate constrained path
	-n NFSFILE Use the nfsfile to determine the NFS configuration
	-I NUM Number of iterations
	-d DIR Use DIR for files and loopback devices
	-s SIZE Use vdevs of SIZE (default: 4G)
	-r RUNFILES Run tests in RUNFILES (default: ${DEFAULT_RUNFILES})
	-t PATH Run single test at PATH relative to test suite
	-T TAGS Comma separated list of tags (default: 'functional')
	-u USER Run single test as USER (default: root)

	EXAMPLES:
	# Run the default (linux) suite of tests and output the configuration used.
	$0 -v

	# Run a smaller suite of tests designed to run more quickly.
	$0 -r linux-fast

	# Run a single test
	$0 -t tests/functional/cli_root/zfs_bookmark/zfs_bookmark_cliargs.ksh

	# Cleanup a previous run of the test suite prior to testing, run the
	# default (linux) suite of tests and perform no cleanup on exit.
	$0 -x

	EOF
	}

	while getopts 'hvqxkfScn:d:s:r:?t:T:u:I:' OPTION; do
	case $OPTION in
	h)
	usage
	exit 1
	;;
	v)
	VERBOSE="yes"
	;;
	q)
	QUIET="yes"
	;;
	x)
	CLEANUPALL="yes"
	;;
	k)
	CLEANUP="no"
	;;
	f)
	LOOPBACK="no"
	;;
	S)
	STACK_TRACER="yes"
	;;
	c)
	constrain_path
	exit
	;;
	n)
	nfsfile=$OPTARG
	[ -f "$nfsfile" ] \|\| fail "Cannot read file: $nfsfile"
	export NFS=1
	. "$nfsfile"
	;;
	d)
	FILEDIR="$OPTARG"
	;;
	I)
	ITERATIONS="$OPTARG"
	if [ "$ITERATIONS" -le 0 ]; then
	fail "Iterations must be greater than 0."
	fi
	;;
	s)
	FILESIZE="$OPTARG"
	;;
	r)
	RUNFILES="$OPTARG"
	;;
	t)
	if [ -n "$SINGLETEST" ]; then
	fail "-t can only be provided once."
	fi
	SINGLETEST="$OPTARG"
	;;
	T)
	TAGS="$OPTARG"
	;;
	u)
	SINGLETESTUSER="$OPTARG"
	;;
	?)
	usage
	exit
	;;
	esac
	done

	shift $((OPTIND-1))

	FILES=${FILES:-"$FILEDIR/file-vdev0 $FILEDIR/file-vdev1 $FILEDIR/file-vdev2"}
	LOOPBACKS=${LOOPBACKS:-""}

	if [ -n "$SINGLETEST" ]; then
	if [ -n "$TAGS" ]; then
	fail "-t and -T are mutually exclusive."
	fi
	RUNFILE_DIR="/var/tmp"
	RUNFILES="zfs-tests.$$.run"
	SINGLEQUIET="False"

	if [ -n "$QUIET" ]; then
	SINGLEQUIET="True"
	fi

	cat >$RUNFILE_DIR/$RUNFILES << EOF
	[DEFAULT]
	pre =
	quiet = $SINGLEQUIET
	pre_user = root
	user = $SINGLETESTUSER
	timeout = 600
	post_user = root
	post =
	outputdir = /var/tmp/test_results
	EOF
	SINGLETESTDIR=$(dirname "$SINGLETEST")
	SINGLETESTFILE=$(basename "$SINGLETEST")
	SETUPSCRIPT=
	CLEANUPSCRIPT=

	if [ -f "$STF_SUITE/$SINGLETESTDIR/setup.ksh" ]; then
	SETUPSCRIPT="setup"
	fi

	if [ -f "$STF_SUITE/$SINGLETESTDIR/cleanup.ksh" ]; then
	CLEANUPSCRIPT="cleanup"
	fi

	cat >>$RUNFILE_DIR/$RUNFILES << EOF

	[$SINGLETESTDIR]
	tests = ['$SINGLETESTFILE']
	pre = $SETUPSCRIPT
	post = $CLEANUPSCRIPT
	tags = ['functional']
	EOF
	fi

	#
	# Use default tag if none was specified
	#
	TAGS=${TAGS:='functional'}

	#
	# Attempt to locate the runfiles describing the test workload.
	#
	R=""
	IFS=,
	for RUNFILE in $RUNFILES; do
	if [ -n "$RUNFILE" ]; then
	SAVED_RUNFILE="$RUNFILE"
	RUNFILE=$(find_runfile "$RUNFILE")
	[ -z "$RUNFILE" ] && fail "Cannot find runfile: $SAVED_RUNFILE"
	R="$R,$RUNFILE"
	fi

	if [ ! -r "$RUNFILE" ]; then
	fail "Cannot read runfile: $RUNFILE"
	fi
	done
	unset IFS
	RUNFILES=${R#,}

	#
	# This script should not be run as root. Instead the test user, which may
	# be a normal user account, needs to be configured such that it can
	# run commands via sudo passwordlessly.
	#
	if [ "$(id -u)" = "0" ]; then
	fail "This script must not be run as root."
	fi

	if [ "$(sudo whoami)" != "root" ]; then
	fail "Passwordless sudo access required."
	fi

	#
	# Constrain the available binaries to a known set.
	#
	constrain_path

	#
	# Check if ksh exists
	#
	if [ "$UNAME" = "FreeBSD" ]; then
	sudo ln -fs /usr/local/bin/ksh93 /bin/ksh
	fi
	[ -e "$STF_PATH/ksh" ] \|\| fail "This test suite requires ksh."
	[ -e "$STF_SUITE/include/default.cfg" ] \|\| fail \
	"Missing $STF_SUITE/include/default.cfg file."

	#
	# Verify the ZFS module stack is loaded.
	#
	if [ "$STACK_TRACER" = "yes" ]; then
	sudo "${ZFS_SH}" -S >/dev/null 2>&1
	else
	sudo "${ZFS_SH}" >/dev/null 2>&1
	fi

	#
	# Attempt to cleanup all previous state for a new test run.
	#
	if [ "$CLEANUPALL" = "yes" ]; then
	cleanup_all
	fi

	#
	# By default preserve any existing pools
	# NOTE: Since 'zpool list' outputs a newline-delimited list convert $KEEP from
	# space-delimited to newline-delimited.
	#
	if [ -z "${KEEP}" ]; then
	KEEP="$(sudo "$ZPOOL" list -H -o name)"
	if [ -z "${KEEP}" ]; then
	KEEP="rpool"
	fi
	else
	KEEP="$(echo "$KEEP" \| tr '[:blank:]' '\n')"
	fi

	#
	# NOTE: The following environment variables are undocumented
	# and should be used for testing purposes only:
	#
	# __ZFS_POOL_EXCLUDE - don't iterate over the pools it lists
	# __ZFS_POOL_RESTRICT - iterate only over the pools it lists
	#
	# See libzfs/libzfs_config.c for more information.
	#
	if [ "$UNAME" = "FreeBSD" ] ; then
	__ZFS_POOL_EXCLUDE="$(echo "$KEEP" \| tr -s '\n' ' ')"
	else
	__ZFS_POOL_EXCLUDE="$(echo "$KEEP" \| sed ':a;N;s/\n/ /g;ba')"
	fi

	. "$STF_SUITE/include/default.cfg"

	-msg
	-msg "--- Configuration ---"
	-msg "Runfiles: $RUNFILES"
	-msg "STF_TOOLS: $STF_TOOLS"
	-msg "STF_SUITE: $STF_SUITE"
	-msg "STF_PATH: $STF_PATH"
	-
	#
	# No DISKS have been provided so a basic file or loopback based devices
	# must be created for the test suite to use.
	#
	if [ -z "${DISKS}" ]; then
	+ #
	+ # If this is a performance run, prevent accidental use of
	+ # loopback devices.
	+ #
	+ [ "$TAGS" = "perf" ] && fail "Running perf tests without disks."
	+
	#
	# Create sparse files for the test suite. These may be used
	# directory or have loopback devices layered on them.
	#
	for TEST_FILE in ${FILES}; do
	[ -f "$TEST_FILE" ] && fail "Failed file exists: ${TEST_FILE}"
	truncate -s "${FILESIZE}" "${TEST_FILE}" \|\|
	fail "Failed creating: ${TEST_FILE} ($?)"
	done

	#
	# If requested setup loopback devices backed by the sparse files.
	#
	if [ "$LOOPBACK" = "yes" ]; then
	test -x "$LOSETUP" \|\| fail "$LOSETUP utility must be installed"

	for TEST_FILE in ${FILES}; do
	if [ "$UNAME" = "FreeBSD" ] ; then
	MDDEVICE=$(sudo "${LOSETUP}" -a -t vnode -f "${TEST_FILE}")
	if [ -z "$MDDEVICE" ] ; then
	fail "Failed: ${TEST_FILE} -> loopback"
	fi
	DISKS="$DISKS $MDDEVICE"
	LOOPBACKS="$LOOPBACKS $MDDEVICE"
	else
	TEST_LOOPBACK=$(sudo "${LOSETUP}" -f)
	sudo "${LOSETUP}" "${TEST_LOOPBACK}" "${TEST_FILE}" \|\|
	fail "Failed: ${TEST_FILE} -> ${TEST_LOOPBACK}"
	BASELOOPBACK=$(basename "$TEST_LOOPBACK")
	DISKS="$DISKS $BASELOOPBACK"
	LOOPBACKS="$LOOPBACKS $TEST_LOOPBACK"
	fi
	done
	DISKS=${DISKS# }
	LOOPBACKS=${LOOPBACKS# }
	else
	DISKS="$FILES"
	fi
	fi

	+#
	+# It may be desirable to test with fewer disks than the default when running
	+# the performance tests, but the functional tests require at least three.
	+#
	NUM_DISKS=$(echo "${DISKS}" \| awk '{print NF}')
	-[ "$NUM_DISKS" -lt 3 ] && fail "Not enough disks ($NUM_DISKS/3 minimum)"
	+if [ "$TAGS" != "perf" ]; then
	+ [ "$NUM_DISKS" -lt 3 ] && fail "Not enough disks ($NUM_DISKS/3 minimum)"
	+fi

	#
	# Disable SELinux until the ZFS Test Suite has been updated accordingly.
	#
	if [ -x "$STF_PATH/setenforce" ]; then
	sudo setenforce permissive >/dev/null 2>&1
	fi

	#
	# Enable internal ZFS debug log and clear it.
	#
	if [ -e /sys/module/zfs/parameters/zfs_dbgmsg_enable ]; then
	sudo /bin/sh -c "echo 1 >/sys/module/zfs/parameters/zfs_dbgmsg_enable"
	sudo /bin/sh -c "echo 0 >/proc/spl/kstat/zfs/dbgmsg"
	fi

	+msg
	+msg "--- Configuration ---"
	+msg "Runfiles: $RUNFILES"
	+msg "STF_TOOLS: $STF_TOOLS"
	+msg "STF_SUITE: $STF_SUITE"
	+msg "STF_PATH: $STF_PATH"
	msg "FILEDIR: $FILEDIR"
	msg "FILES: $FILES"
	msg "LOOPBACKS: $LOOPBACKS"
	msg "DISKS: $DISKS"
	msg "NUM_DISKS: $NUM_DISKS"
	msg "FILESIZE: $FILESIZE"
	msg "ITERATIONS: $ITERATIONS"
	msg "TAGS: $TAGS"
	msg "STACK_TRACER: $STACK_TRACER"
	msg "Keep pool(s): $KEEP"
	msg "Missing util(s): $STF_MISSING_BIN"
	msg ""

	export STF_TOOLS
	export STF_SUITE
	export STF_PATH
	export DISKS
	export FILEDIR
	export KEEP
	export __ZFS_POOL_EXCLUDE
	export TESTFAIL_CALLBACKS
	export PATH=$STF_PATH

	if [ "$UNAME" = "FreeBSD" ] ; then
	mkdir -p "$FILEDIR" \|\| true
	RESULTS_FILE=$(mktemp -u "${FILEDIR}/zts-results.XXXXXX")
	REPORT_FILE=$(mktemp -u "${FILEDIR}/zts-report.XXXXXX")
	else
	RESULTS_FILE=$(mktemp -u -t zts-results.XXXXXX -p "$FILEDIR")
	REPORT_FILE=$(mktemp -u -t zts-report.XXXXXX -p "$FILEDIR")
	fi

	#
	# Run all the tests as specified.
	#
	msg "${TEST_RUNNER} ${QUIET:+-q}" \
	"-c \"${RUNFILES}\"" \
	"-T \"${TAGS}\"" \
	"-i \"${STF_SUITE}\"" \
	"-I \"${ITERATIONS}\""
	${TEST_RUNNER} ${QUIET:+-q} \
	-c "${RUNFILES}" \
	-T "${TAGS}" \
	-i "${STF_SUITE}" \
	-I "${ITERATIONS}" \
	2>&1 \| tee "$RESULTS_FILE"

	#
	# Analyze the results.
	#
	${ZTS_REPORT} "$RESULTS_FILE" >"$REPORT_FILE"
	RESULT=$?
	cat "$REPORT_FILE"

	RESULTS_DIR=$(awk '/^Log directory/ { print $3 }' "$RESULTS_FILE")
	if [ -d "$RESULTS_DIR" ]; then
	cat "$RESULTS_FILE" "$REPORT_FILE" >"$RESULTS_DIR/results"
	fi

	rm -f "$RESULTS_FILE" "$REPORT_FILE"

	if [ -n "$SINGLETEST" ]; then
	rm -f "$RUNFILES" >/dev/null 2>&1
	fi

	exit ${RESULT}
	diff --git a/sys/contrib/openzfs/scripts/zfs.sh b/sys/contrib/openzfs/scripts/zfs.sh
	index 39c49d71e59f..7870b8930cab 100755
	--- a/sys/contrib/openzfs/scripts/zfs.sh
	+++ b/sys/contrib/openzfs/scripts/zfs.sh
	@@ -1,280 +1,288 @@
	#!/bin/sh
	#
	# A simple script to load/unload the ZFS module stack.
	#

	BASE_DIR=$(dirname "$0")
	SCRIPT_COMMON=common.sh
	if [ -f "${BASE_DIR}/${SCRIPT_COMMON}" ]; then
	. "${BASE_DIR}/${SCRIPT_COMMON}"
	else
	echo "Missing helper script ${SCRIPT_COMMON}" && exit 1
	fi

	PROG=zfs.sh
	VERBOSE="no"
	UNLOAD="no"
	+LOAD="yes"
	STACK_TRACER="no"

	ZED_PIDFILE=${ZED_PIDFILE:-/var/run/zed.pid}
	LDMOD=${LDMOD:-/sbin/modprobe}

	KMOD_ZLIB_DEFLATE=${KMOD_ZLIB_DEFLATE:-zlib_deflate}
	KMOD_ZLIB_INFLATE=${KMOD_ZLIB_INFLATE:-zlib_inflate}
	KMOD_SPL=${KMOD_SPL:-spl}
	KMOD_ZAVL=${KMOD_ZAVL:-zavl}
	KMOD_ZNVPAIR=${KMOD_ZNVPAIR:-znvpair}
	KMOD_ZUNICODE=${KMOD_ZUNICODE:-zunicode}
	KMOD_ZCOMMON=${KMOD_ZCOMMON:-zcommon}
	KMOD_ZLUA=${KMOD_ZLUA:-zlua}
	KMOD_ICP=${KMOD_ICP:-icp}
	KMOD_ZFS=${KMOD_ZFS:-zfs}
	KMOD_FREEBSD=${KMOD_FREEBSD:-openzfs}
	KMOD_ZZSTD=${KMOD_ZZSTD:-zzstd}


	usage() {
	cat << EOF
	USAGE:
	$0 [hvudS] [module-options]

	DESCRIPTION:
	Load/unload the ZFS module stack.

	OPTIONS:
	-h Show this message
	-v Verbose
	+ -r Reload modules
	-u Unload modules
	-S Enable kernel stack tracer
	EOF
	}

	-while getopts 'hvuS' OPTION; do
	+while getopts 'hvruS' OPTION; do
	case $OPTION in
	h)
	usage
	exit 1
	;;
	v)
	VERBOSE="yes"
	;;
	+ r)
	+ UNLOAD="yes"
	+ LOAD="yes"
	+ ;;
	u)
	UNLOAD="yes"
	+ LOAD="no"
	;;
	S)
	STACK_TRACER="yes"
	;;
	?)
	usage
	exit
	;;
	esac
	done

	kill_zed() {
	if [ -f "$ZED_PIDFILE" ]; then
	PID=$(cat "$ZED_PIDFILE")
	kill "$PID"
	fi
	}

	check_modules_linux() {
	LOADED_MODULES=""
	MISSING_MODULES=""

	for KMOD in $KMOD_SPL $KMOD_ZAVL $KMOD_ZNVPAIR $KMOD_ZUNICODE $KMOD_ZCOMMON \
	$KMOD_ZLUA $KMOD_ZZSTD $KMOD_ICP $KMOD_ZFS; do
	NAME=$(basename "$KMOD" .ko)

	if lsmod \| grep -E -q "^${NAME}"; then
	LOADED_MODULES="$LOADED_MODULES\t$NAME\n"
	fi

	if ! modinfo "$KMOD" >/dev/null 2>&1; then
	MISSING_MODULES="$MISSING_MODULES\t${KMOD}\n"
	fi
	done

	if [ -n "$LOADED_MODULES" ]; then
	printf "Unload the kernel modules by running '%s -u':\n" "$PROG"
	printf "%b" "$LOADED_MODULES"
	exit 1
	fi

	if [ -n "$MISSING_MODULES" ]; then
	printf "The following kernel modules can not be found:\n"
	printf "%b" "$MISSING_MODULES"
	exit 1
	fi

	return 0
	}

	load_module_linux() {
	KMOD=$1

	FILE=$(modinfo "$KMOD" \| awk '/^filename:/ {print $2}')
	VERSION=$(modinfo "$KMOD" \| awk '/^version:/ {print $2}')

	if [ "$VERBOSE" = "yes" ]; then
	echo "Loading: $FILE ($VERSION)"
	fi

	if ! $LDMOD "$KMOD" >/dev/null 2>&1; then
	echo "Failed to load $KMOD"
	return 1
	fi

	return 0
	}

	load_modules_freebsd() {
	kldload "$KMOD_FREEBSD" \|\| return 1

	if [ "$VERBOSE" = "yes" ]; then
	echo "Successfully loaded ZFS module stack"
	fi

	return 0
	}

	load_modules_linux() {
	mkdir -p /etc/zfs

	if modinfo "$KMOD_ZLIB_DEFLATE" >/dev/null 2>&1; then
	modprobe "$KMOD_ZLIB_DEFLATE" >/dev/null 2>&1
	fi

	if modinfo "$KMOD_ZLIB_INFLATE">/dev/null 2>&1; then
	modprobe "$KMOD_ZLIB_INFLATE" >/dev/null 2>&1
	fi

	for KMOD in $KMOD_SPL $KMOD_ZAVL $KMOD_ZNVPAIR \
	$KMOD_ZUNICODE $KMOD_ZCOMMON $KMOD_ZLUA $KMOD_ZZSTD \
	$KMOD_ICP $KMOD_ZFS; do
	load_module_linux "$KMOD" \|\| return 1
	done

	if [ "$VERBOSE" = "yes" ]; then
	echo "Successfully loaded ZFS module stack"
	fi

	return 0
	}

	unload_module_linux() {
	KMOD=$1

	NAME=$(basename "$KMOD" .ko)
	FILE=$(modinfo "$KMOD" \| awk '/^filename:/ {print $2}')
	VERSION=$(modinfo "$KMOD" \| awk '/^version:/ {print $2}')

	if [ "$VERBOSE" = "yes" ]; then
	echo "Unloading: $KMOD ($VERSION)"
	fi

	rmmod "$NAME" \|\| echo "Failed to unload $NAME"

	return 0
	}

	unload_modules_freebsd() {
	kldunload "$KMOD_FREEBSD" \|\| echo "Failed to unload $KMOD_FREEBSD"

	if [ "$VERBOSE" = "yes" ]; then
	echo "Successfully unloaded ZFS module stack"
	fi

	return 0
	}

	unload_modules_linux() {
	for KMOD in $KMOD_ZFS $KMOD_ICP $KMOD_ZZSTD $KMOD_ZLUA $KMOD_ZCOMMON \
	$KMOD_ZUNICODE $KMOD_ZNVPAIR $KMOD_ZAVL $KMOD_SPL; do
	NAME=$(basename "$KMOD" .ko)
	USE_COUNT=$(lsmod \| grep -E "^${NAME} " \| awk '{print $3}')

	if [ "$USE_COUNT" = "0" ] ; then
	unload_module_linux "$KMOD" \|\| return 1
	elif [ "$USE_COUNT" != "" ] ; then
	echo "Module ${NAME} is still in use!"
	return 1
	fi
	done

	if modinfo "$KMOD_ZLIB_DEFLATE" >/dev/null 2>&1; then
	modprobe -r "$KMOD_ZLIB_DEFLATE" >/dev/null 2>&1
	fi

	if modinfo "$KMOD_ZLIB_INFLATE">/dev/null 2>&1; then
	modprobe -r "$KMOD_ZLIB_INFLATE" >/dev/null 2>&1
	fi

	if [ "$VERBOSE" = "yes" ]; then
	echo "Successfully unloaded ZFS module stack"
	fi

	return 0
	}

	stack_clear_linux() {
	STACK_MAX_SIZE=/sys/kernel/debug/tracing/stack_max_size
	STACK_TRACER_ENABLED=/proc/sys/kernel/stack_tracer_enabled

	if [ "$STACK_TRACER" = "yes" ] && [ -e "$STACK_MAX_SIZE" ]; then
	echo 1 >"$STACK_TRACER_ENABLED"
	echo 0 >"$STACK_MAX_SIZE"
	fi
	}

	stack_check_linux() {
	STACK_MAX_SIZE=/sys/kernel/debug/tracing/stack_max_size
	STACK_TRACE=/sys/kernel/debug/tracing/stack_trace
	STACK_LIMIT=15362

	if [ -e "$STACK_MAX_SIZE" ]; then
	STACK_SIZE=$(cat "$STACK_MAX_SIZE")

	if [ "$STACK_SIZE" -ge "$STACK_LIMIT" ]; then
	echo
	echo "Warning: max stack size $STACK_SIZE bytes"
	cat "$STACK_TRACE"
	fi
	fi
	}

	if [ "$(id -u)" != 0 ]; then
	echo "Must run as root"
	exit 1
	fi

	UNAME=$(uname -s)

	if [ "$UNLOAD" = "yes" ]; then
	kill_zed
	umount -t zfs -a
	case $UNAME in
	FreeBSD)
	unload_modules_freebsd
	;;
	Linux)
	stack_check_linux
	unload_modules_linux
	;;
	esac
	-else
	+fi
	+if [ "$LOAD" = "yes" ]; then
	case $UNAME in
	FreeBSD)
	load_modules_freebsd
	;;
	Linux)
	stack_clear_linux
	check_modules_linux
	load_modules_linux "$@"
	udevadm trigger
	udevadm settle
	;;
	esac
	fi

	exit 0
	diff --git a/sys/contrib/openzfs/scripts/zloop.sh b/sys/contrib/openzfs/scripts/zloop.sh
	index 546e7001776d..4a572ebab1fc 100755
	--- a/sys/contrib/openzfs/scripts/zloop.sh
	+++ b/sys/contrib/openzfs/scripts/zloop.sh
	@@ -1,333 +1,339 @@
	#!/usr/bin/env bash

	#
	# CDDL HEADER START
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#
	# CDDL HEADER END
	#

	#
	# Copyright (c) 2015 by Delphix. All rights reserved.
	# Copyright (C) 2016 Lawrence Livermore National Security, LLC.
	# Copyright (c) 2017, Intel Corporation.
	#

	BASE_DIR=$(dirname "$0")
	SCRIPT_COMMON=common.sh
	if [ -f "${BASE_DIR}/${SCRIPT_COMMON}" ]; then
	. "${BASE_DIR}/${SCRIPT_COMMON}"
	else
	echo "Missing helper script ${SCRIPT_COMMON}" && exit 1
	fi

	# shellcheck disable=SC2034
	PROG=zloop.sh
	GDB=${GDB:-gdb}

	DEFAULTWORKDIR=/var/tmp
	DEFAULTCOREDIR=/var/tmp/zloop

	function usage
	{
	- echo -e "\n$0 [-t <timeout>] [ -s <vdev size> ] [-c <dump directory>]" \
	- "[ -- [extra ztest parameters]]\n" \
	- "\n" \
	- " This script runs ztest repeatedly with randomized arguments.\n" \
	- " If a crash is encountered, the ztest logs, any associated\n" \
	- " vdev files, and core file (if one exists) are moved to the\n" \
	- " output directory ($DEFAULTCOREDIR by default). Any options\n" \
	- " after the -- end-of-options marker will be passed to ztest.\n" \
	- "\n" \
	- " Options:\n" \
	- " -t Total time to loop for, in seconds. If not provided,\n" \
	- " zloop runs forever.\n" \
	- " -s Size of vdev devices.\n" \
	- " -f Specify working directory for ztest vdev files.\n" \
	- " -c Specify a core dump directory to use.\n" \
	- " -m Max number of core dumps to allow before exiting.\n" \
	- " -l Create 'ztest.core.N' symlink to core directory.\n" \
	- " -h Print this help message.\n" \
	- "" >&2
	+ cat >&2 <<EOF
	+
	+$0 [-hl] [-c <dump directory>] [-f <vdev directory>]
	+ [-m <max core dumps>] [-s <vdev size>] [-t <timeout>]
	+ [-I <max iterations>] [-- [extra ztest parameters]]
	+
	+ This script runs ztest repeatedly with randomized arguments.
	+ If a crash is encountered, the ztest logs, any associated
	+ vdev files, and core file (if one exists) are moved to the
	+ output directory ($DEFAULTCOREDIR by default). Any options
	+ after the -- end-of-options marker will be passed to ztest.
	+
	+ Options:
	+ -c Specify a core dump directory to use.
	+ -f Specify working directory for ztest vdev files.
	+ -h Print this help message.
	+ -l Create 'ztest.core.N' symlink to core directory.
	+ -m Max number of core dumps to allow before exiting.
	+ -s Size of vdev devices.
	+ -t Total time to loop for, in seconds. If not provided,
	+ zloop runs forever.
	+ -I Max number of iterations to loop before exiting.
	+
	+EOF
	}

	function or_die
	{
	# shellcheck disable=SC2068
	if ! $@; then
	echo "Command failed: $*"
	exit 1
	fi
	}

	case $(uname) in
	FreeBSD)
	coreglob="z*.core"
	;;
	Linux)
	# core file helpers
	origcorepattern="$(cat /proc/sys/kernel/core_pattern)"
	coreglob="$(grep -E -o '^([^\|%[:space:]])' /proc/sys/kernel/core_pattern)"

	if [[ $coreglob = "*" ]]; then
	echo "Setting core file pattern..."
	echo "core" > /proc/sys/kernel/core_pattern
	coreglob="$(grep -E -o '^([^\|%[:space:]]*)' \
	/proc/sys/kernel/core_pattern)*"
	fi
	;;
	*)
	exit 1
	;;
	esac

	function core_file
	{
	# shellcheck disable=SC2012,SC2086
	ls -tr1 $coreglob 2>/dev/null \| head -1
	}

	function core_prog
	{
	prog=$ZTEST
	core_id=$($GDB --batch -c "$1" \| grep "Core was generated by" \| \
	tr \' ' ')
	if [[ "$core_id" == "zdb " ]]; then
	prog=$ZDB
	fi
	printf "%s" "$prog"
	}

	function store_core
	{
	core="$(core_file)"
	if [[ $ztrc -ne 0 ]] \|\| [[ -f "$core" ]]; then
	df -h "$workdir" >>ztest.out
	coreid=$(date "+zloop-%y%m%d-%H%M%S")
	foundcrashes=$((foundcrashes + 1))

	# zdb debugging
	zdbcmd="$ZDB -U "$workdir/zpool.cache" -dddMmDDG ztest"
	zdbdebug=$($zdbcmd 2>&1)
	echo -e "$zdbcmd\n" >>ztest.zdb
	echo "$zdbdebug" >>ztest.zdb

	dest=$coredir/$coreid
	or_die mkdir -p "$dest"
	or_die mkdir -p "$dest/vdev"

	if [[ $symlink -ne 0 ]]; then
	or_die ln -sf "$dest" ztest.core.$foundcrashes
	fi

	echo "*** ztest crash found - moving logs to $dest"

	or_die mv ztest.history "$dest/"
	or_die mv ztest.zdb "$dest/"
	or_die mv ztest.out "$dest/"
	or_die mv "$workdir/ztest*" "$dest/vdev/"

	if [[ -e "$workdir/zpool.cache" ]]; then
	or_die mv "$workdir/zpool.cache" "$dest/vdev/"
	fi

	# check for core
	if [[ -f "$core" ]]; then
	coreprog=$(core_prog "$core")
	coredebug=$($GDB --batch --quiet \
	-ex "set print thread-events off" \
	-ex "printf \"\n Backtrace \n*\n\"" \
	-ex "bt" \
	-ex "printf \"\n Libraries \n*\n\"" \
	-ex "info sharedlib" \
	-ex "printf \"\n Threads (full) \n*\n\"" \
	-ex "info threads" \
	-ex "printf \"\n Backtraces \n*\n\"" \
	-ex "thread apply all bt" \
	-ex "printf \"\n Backtraces (full) \n*\n\"" \
	-ex "thread apply all bt full" \
	-ex "quit" "$coreprog" "$core" 2>&1 \| \
	grep -v "New LWP")

	# Dump core + logs to stored directory
	echo "$coredebug" >>"$dest/ztest.gdb"
	or_die mv "$core" "$dest/"

	# Record info in cores logfile
	echo "*** core @ $coredir/$coreid/$core:" \| \
	tee -a ztest.cores
	fi

	if [[ $coremax -gt 0 ]] &&
	[[ $foundcrashes -ge $coremax ]]; then
	echo "exiting... max $coremax allowed cores"
	exit 1
	else
	echo "continuing..."
	fi
	fi
	}

	# parse arguments
	# expected format: zloop [-t timeout] [-c coredir] [-- extra ztest args]
	coredir=$DEFAULTCOREDIR
	basedir=$DEFAULTWORKDIR
	rundir="zloop-run"
	timeout=0
	size="512m"
	coremax=0
	symlink=0
	-while getopts ":ht:m:s:c:f:l" opt; do
	+iterations=0
	+while getopts ":ht:m:I:s:c:f:l" opt; do
	case $opt in
	t ) [[ $OPTARG -gt 0 ]] && timeout=$OPTARG ;;
	m ) [[ $OPTARG -gt 0 ]] && coremax=$OPTARG ;;
	+ I ) [[ $OPTARG ]] && iterations=$OPTARG ;;
	s ) [[ $OPTARG ]] && size=$OPTARG ;;
	c ) [[ $OPTARG ]] && coredir=$OPTARG ;;
	f ) [[ $OPTARG ]] && basedir=$(readlink -f "$OPTARG") ;;
	l ) symlink=1 ;;
	h ) usage
	exit 2
	;;
	* ) echo "Invalid argument: -$OPTARG";
	usage
	exit 1
	esac
	done
	# pass remaining arguments on to ztest
	shift $((OPTIND - 1))

	# enable core dumps
	ulimit -c unlimited
	export ASAN_OPTIONS=abort_on_error=1:disable_coredump=0

	if [[ -f "$(core_file)" ]]; then
	echo -n "There's a core dump here you might want to look at first... "
	core_file
	echo
	exit 1
	fi

	if [[ ! -d $coredir ]]; then
	echo "core dump directory ($coredir) does not exist, creating it."
	or_die mkdir -p "$coredir"
	fi

	if [[ ! -w $coredir ]]; then
	echo "core dump directory ($coredir) is not writable."
	exit 1
	fi

	or_die rm -f ztest.history
	or_die rm -f ztest.zdb
	or_die rm -f ztest.cores

	ztrc=0 # ztest return value
	foundcrashes=0 # number of crashes found so far
	starttime=$(date +%s)
	curtime=$starttime
	+iteration=0

	# if no timeout was specified, loop forever.
	-while [[ $timeout -eq 0 ]] \|\| [[ $curtime -le $((starttime + timeout)) ]]; do
	+while (( timeout == 0 )) \|\| (( curtime <= (starttime + timeout) )); do
	+ if (( iterations > 0 )) && (( iteration++ == iterations )); then
	+ break
	+ fi
	+
	zopt="-G -VVVVV"

	# start each run with an empty directory
	workdir="$basedir/$rundir"
	or_die rm -rf "$workdir"
	or_die mkdir "$workdir"

	# switch between three types of configs
	# 1/3 basic, 1/3 raidz mix, and 1/3 draid mix
	choice=$((RANDOM % 3))

	# ashift range 9 - 15
	align=$(((RANDOM % 2) * 3 + 9))

	# randomly use special classes
	class="special=random"

	if [[ $choice -eq 0 ]]; then
	# basic mirror only
	parity=1
	mirrors=2
	draid_data=0
	draid_spares=0
	raid_children=0
	vdevs=2
	raid_type="raidz"
	elif [[ $choice -eq 1 ]]; then
	# fully randomized mirror/raidz (sans dRAID)
	parity=$(((RANDOM % 3) + 1))
	mirrors=$(((RANDOM % 3) * 1))
	draid_data=0
	draid_spares=0
	raid_children=$((((RANDOM % 9) + parity + 1) * (RANDOM % 2)))
	vdevs=$(((RANDOM % 3) + 3))
	raid_type="raidz"
	else
	# fully randomized dRAID (sans mirror/raidz)
	parity=$(((RANDOM % 3) + 1))
	mirrors=0
	draid_data=$(((RANDOM % 8) + 3))
	draid_spares=$(((RANDOM % 2) + parity))
	stripe=$((draid_data + parity))
	extra=$((draid_spares + (RANDOM % 4)))
	raid_children=$(((((RANDOM % 4) + 1) * stripe) + extra))
	vdevs=$((RANDOM % 3))
	raid_type="draid"
	fi

	- # run from 30 to 120 seconds
	- runtime=$(((RANDOM % 90) + 30))
	- passtime=$((RANDOM % (runtime / 3 + 1) + 10))
	-
	zopt="$zopt -K $raid_type"
	zopt="$zopt -m $mirrors"
	zopt="$zopt -r $raid_children"
	zopt="$zopt -D $draid_data"
	zopt="$zopt -S $draid_spares"
	zopt="$zopt -R $parity"
	zopt="$zopt -v $vdevs"
	zopt="$zopt -a $align"
	zopt="$zopt -C $class"
	- zopt="$zopt -T $runtime"
	- zopt="$zopt -P $passtime"
	zopt="$zopt -s $size"
	zopt="$zopt -f $workdir"

	cmd="$ZTEST $zopt $*"
	desc="$(date '+%m/%d %T') $cmd"
	echo "$desc" \| tee -a ztest.history
	echo "$desc" >>ztest.out
	$cmd >>ztest.out 2>&1
	ztrc=$?
	grep -E '===\|WARNING' ztest.out >>ztest.history

	store_core

	curtime=$(date +%s)
	done

	echo "zloop finished, $foundcrashes crashes found"

	# restore core pattern.
	case $(uname) in
	Linux)
	echo "$origcorepattern" > /proc/sys/kernel/core_pattern
	;;
	*)
	;;
	esac

	uptime >>ztest.out

	if [[ $foundcrashes -gt 0 ]]; then
	exit 1
	fi
	diff --git a/sys/contrib/openzfs/tests/Makefile.am b/sys/contrib/openzfs/tests/Makefile.am
	index 4bdde9c4508a..1dfc2cc5f518 100644
	--- a/sys/contrib/openzfs/tests/Makefile.am
	+++ b/sys/contrib/openzfs/tests/Makefile.am
	@@ -1,8 +1,8 @@
	include $(top_srcdir)/config/Shellcheck.am

	SUBDIRS = runfiles test-runner zfs-tests

	EXTRA_DIST = README.md

	-SHELLCHECKSCRIPTS = $$(find -name '*.sh')
	+SHELLCHECKSCRIPTS = $$(find . -name '*.sh')
	.PHONY: $(SHELLCHECKSCRIPTS)
	diff --git a/sys/contrib/openzfs/tests/runfiles/common.run b/sys/contrib/openzfs/tests/runfiles/common.run
	index 5f5e10d133e8..a62cd6ad39f5 100644
	--- a/sys/contrib/openzfs/tests/runfiles/common.run
	+++ b/sys/contrib/openzfs/tests/runfiles/common.run
	@@ -1,943 +1,946 @@
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#
	# This run file contains all of the common functional tests. When
	# adding a new test consider also adding it to the sanity.run file
	# if the new test runs to completion in only a few seconds.
	#
	# Approximate run time: 4-5 hours
	#

	[DEFAULT]
	pre = setup
	quiet = False
	pre_user = root
	user = root
	timeout = 600
	post_user = root
	post = cleanup
	failsafe_user = root
	failsafe = callbacks/zfs_failsafe
	outputdir = /var/tmp/test_results
	tags = ['functional']

	[tests/functional/acl/off]
	tests = ['posixmode']
	tags = ['functional', 'acl']

	[tests/functional/alloc_class]
	tests = ['alloc_class_001_pos', 'alloc_class_002_neg', 'alloc_class_003_pos',
	'alloc_class_004_pos', 'alloc_class_005_pos', 'alloc_class_006_pos',
	'alloc_class_007_pos', 'alloc_class_008_pos', 'alloc_class_009_pos',
	'alloc_class_010_pos', 'alloc_class_011_neg', 'alloc_class_012_pos',
	'alloc_class_013_pos']
	tags = ['functional', 'alloc_class']

	[tests/functional/arc]
	tests = ['dbufstats_001_pos', 'dbufstats_002_pos', 'dbufstats_003_pos',
	'arcstats_runtime_tuning']
	tags = ['functional', 'arc']

	[tests/functional/atime]
	tests = ['atime_001_pos', 'atime_002_neg', 'root_atime_off', 'root_atime_on']
	tags = ['functional', 'atime']

	[tests/functional/bootfs]
	tests = ['bootfs_001_pos', 'bootfs_002_neg', 'bootfs_003_pos',
	'bootfs_004_neg', 'bootfs_005_neg', 'bootfs_006_pos', 'bootfs_007_pos',
	'bootfs_008_pos']
	tags = ['functional', 'bootfs']

	[tests/functional/btree]
	tests = ['btree_positive', 'btree_negative']
	tags = ['functional', 'btree']
	pre =
	post =

	[tests/functional/cache]
	tests = ['cache_001_pos', 'cache_002_pos', 'cache_003_pos', 'cache_004_neg',
	'cache_005_neg', 'cache_006_pos', 'cache_007_neg', 'cache_008_neg',
	'cache_009_pos', 'cache_010_pos', 'cache_011_pos', 'cache_012_pos']
	tags = ['functional', 'cache']

	[tests/functional/cachefile]
	tests = ['cachefile_001_pos', 'cachefile_002_pos', 'cachefile_003_pos',
	'cachefile_004_pos']
	tags = ['functional', 'cachefile']

	[tests/functional/casenorm]
	tests = ['case_all_values', 'norm_all_values', 'mixed_create_failure',
	'sensitive_none_lookup', 'sensitive_none_delete',
	'sensitive_formd_lookup', 'sensitive_formd_delete',
	'insensitive_none_lookup', 'insensitive_none_delete',
	'insensitive_formd_lookup', 'insensitive_formd_delete',
	'mixed_none_lookup', 'mixed_none_lookup_ci', 'mixed_none_delete',
	'mixed_formd_lookup', 'mixed_formd_lookup_ci', 'mixed_formd_delete']
	tags = ['functional', 'casenorm']

	[tests/functional/channel_program/lua_core]
	tests = ['tst.args_to_lua', 'tst.divide_by_zero', 'tst.exists',
	'tst.integer_illegal', 'tst.integer_overflow', 'tst.language_functions_neg',
	'tst.language_functions_pos', 'tst.large_prog', 'tst.libraries',
	'tst.memory_limit', 'tst.nested_neg', 'tst.nested_pos', 'tst.nvlist_to_lua',
	'tst.recursive_neg', 'tst.recursive_pos', 'tst.return_large',
	'tst.return_nvlist_neg', 'tst.return_nvlist_pos',
	'tst.return_recursive_table', 'tst.stack_gsub', 'tst.timeout']
	tags = ['functional', 'channel_program', 'lua_core']

	[tests/functional/channel_program/synctask_core]
	tests = ['tst.destroy_fs', 'tst.destroy_snap', 'tst.get_count_and_limit',
	'tst.get_index_props', 'tst.get_mountpoint', 'tst.get_neg',
	'tst.get_number_props', 'tst.get_string_props', 'tst.get_type',
	'tst.get_userquota', 'tst.get_written', 'tst.inherit', 'tst.list_bookmarks',
	'tst.list_children', 'tst.list_clones', 'tst.list_holds',
	'tst.list_snapshots', 'tst.list_system_props',
	'tst.list_user_props', 'tst.parse_args_neg','tst.promote_conflict',
	'tst.promote_multiple', 'tst.promote_simple', 'tst.rollback_mult',
	'tst.rollback_one', 'tst.set_props', 'tst.snapshot_destroy', 'tst.snapshot_neg',
	'tst.snapshot_recursive', 'tst.snapshot_simple',
	'tst.bookmark.create', 'tst.bookmark.copy',
	'tst.terminate_by_signal'
	]
	tags = ['functional', 'channel_program', 'synctask_core']

	[tests/functional/checksum]
	tests = ['run_sha2_test', 'run_skein_test', 'filetest_001_pos',
	'filetest_002_pos']
	tags = ['functional', 'checksum']

	[tests/functional/clean_mirror]
	tests = [ 'clean_mirror_001_pos', 'clean_mirror_002_pos',
	'clean_mirror_003_pos', 'clean_mirror_004_pos']
	tags = ['functional', 'clean_mirror']

	[tests/functional/cli_root/zdb]
	tests = ['zdb_002_pos', 'zdb_003_pos', 'zdb_004_pos', 'zdb_005_pos',
	'zdb_006_pos', 'zdb_args_neg', 'zdb_args_pos',
	'zdb_block_size_histogram', 'zdb_checksum', 'zdb_decompress',
	'zdb_display_block', 'zdb_object_range_neg', 'zdb_object_range_pos',
	'zdb_objset_id', 'zdb_decompress_zstd', 'zdb_recover', 'zdb_recover_2']
	pre =
	post =
	tags = ['functional', 'cli_root', 'zdb']

	[tests/functional/cli_root/zfs]
	tests = ['zfs_001_neg', 'zfs_002_pos']
	tags = ['functional', 'cli_root', 'zfs']

	[tests/functional/cli_root/zfs_bookmark]
	tests = ['zfs_bookmark_cliargs']
	tags = ['functional', 'cli_root', 'zfs_bookmark']

	[tests/functional/cli_root/zfs_change-key]
	tests = ['zfs_change-key', 'zfs_change-key_child', 'zfs_change-key_format',
	'zfs_change-key_inherit', 'zfs_change-key_load', 'zfs_change-key_location',
	'zfs_change-key_pbkdf2iters', 'zfs_change-key_clones']
	tags = ['functional', 'cli_root', 'zfs_change-key']

	[tests/functional/cli_root/zfs_clone]
	tests = ['zfs_clone_001_neg', 'zfs_clone_002_pos', 'zfs_clone_003_pos',
	'zfs_clone_004_pos', 'zfs_clone_005_pos', 'zfs_clone_006_pos',
	'zfs_clone_007_pos', 'zfs_clone_008_neg', 'zfs_clone_009_neg',
	'zfs_clone_010_pos', 'zfs_clone_encrypted', 'zfs_clone_deeply_nested']
	tags = ['functional', 'cli_root', 'zfs_clone']

	[tests/functional/cli_root/zfs_copies]
	tests = ['zfs_copies_001_pos', 'zfs_copies_002_pos', 'zfs_copies_003_pos',
	'zfs_copies_004_neg', 'zfs_copies_005_neg', 'zfs_copies_006_pos']
	tags = ['functional', 'cli_root', 'zfs_copies']

	[tests/functional/cli_root/zfs_create]
	tests = ['zfs_create_001_pos', 'zfs_create_002_pos', 'zfs_create_003_pos',
	'zfs_create_004_pos', 'zfs_create_005_pos', 'zfs_create_006_pos',
	'zfs_create_007_pos', 'zfs_create_008_neg', 'zfs_create_009_neg',
	'zfs_create_010_neg', 'zfs_create_011_pos', 'zfs_create_012_pos',
	'zfs_create_013_pos', 'zfs_create_014_pos', 'zfs_create_encrypted',
	'zfs_create_crypt_combos', 'zfs_create_dryrun', 'zfs_create_nomount',
	'zfs_create_verbose']
	tags = ['functional', 'cli_root', 'zfs_create']

	[tests/functional/cli_root/zfs_destroy]
	tests = ['zfs_clone_livelist_condense_and_disable',
	'zfs_clone_livelist_condense_races', 'zfs_clone_livelist_dedup',
	'zfs_destroy_001_pos', 'zfs_destroy_002_pos', 'zfs_destroy_003_pos',
	'zfs_destroy_004_pos', 'zfs_destroy_005_neg', 'zfs_destroy_006_neg',
	'zfs_destroy_007_neg', 'zfs_destroy_008_pos', 'zfs_destroy_009_pos',
	'zfs_destroy_010_pos', 'zfs_destroy_011_pos', 'zfs_destroy_012_pos',
	'zfs_destroy_013_neg', 'zfs_destroy_014_pos', 'zfs_destroy_015_pos',
	'zfs_destroy_016_pos', 'zfs_destroy_clone_livelist',
	'zfs_destroy_dev_removal', 'zfs_destroy_dev_removal_condense']
	tags = ['functional', 'cli_root', 'zfs_destroy']

	[tests/functional/cli_root/zfs_diff]
	tests = ['zfs_diff_changes', 'zfs_diff_cliargs', 'zfs_diff_timestamp',
	'zfs_diff_types', 'zfs_diff_encrypted']
	tags = ['functional', 'cli_root', 'zfs_diff']

	[tests/functional/cli_root/zfs_get]
	tests = ['zfs_get_001_pos', 'zfs_get_002_pos', 'zfs_get_003_pos',
	'zfs_get_004_pos', 'zfs_get_005_neg', 'zfs_get_006_neg', 'zfs_get_007_neg',
	'zfs_get_008_pos', 'zfs_get_009_pos', 'zfs_get_010_neg']
	tags = ['functional', 'cli_root', 'zfs_get']

	[tests/functional/cli_root/zfs_ids_to_path]
	tests = ['zfs_ids_to_path_001_pos']
	tags = ['functional', 'cli_root', 'zfs_ids_to_path']

	[tests/functional/cli_root/zfs_inherit]
	tests = ['zfs_inherit_001_neg', 'zfs_inherit_002_neg', 'zfs_inherit_003_pos',
	'zfs_inherit_mountpoint']
	tags = ['functional', 'cli_root', 'zfs_inherit']

	[tests/functional/cli_root/zfs_load-key]
	tests = ['zfs_load-key', 'zfs_load-key_all', 'zfs_load-key_file',
	'zfs_load-key_location', 'zfs_load-key_noop', 'zfs_load-key_recursive']
	tags = ['functional', 'cli_root', 'zfs_load-key']

	[tests/functional/cli_root/zfs_mount]
	tests = ['zfs_mount_001_pos', 'zfs_mount_002_pos', 'zfs_mount_003_pos',
	'zfs_mount_004_pos', 'zfs_mount_005_pos', 'zfs_mount_007_pos',
	'zfs_mount_009_neg', 'zfs_mount_010_neg', 'zfs_mount_011_neg',
	'zfs_mount_012_pos', 'zfs_mount_all_001_pos', 'zfs_mount_encrypted',
	'zfs_mount_remount', 'zfs_mount_all_fail', 'zfs_mount_all_mountpoints',
	'zfs_mount_test_race']
	tags = ['functional', 'cli_root', 'zfs_mount']

	[tests/functional/cli_root/zfs_program]
	tests = ['zfs_program_json']
	tags = ['functional', 'cli_root', 'zfs_program']

	[tests/functional/cli_root/zfs_promote]
	tests = ['zfs_promote_001_pos', 'zfs_promote_002_pos', 'zfs_promote_003_pos',
	'zfs_promote_004_pos', 'zfs_promote_005_pos', 'zfs_promote_006_neg',
	'zfs_promote_007_neg', 'zfs_promote_008_pos', 'zfs_promote_encryptionroot']
	tags = ['functional', 'cli_root', 'zfs_promote']

	[tests/functional/cli_root/zfs_property]
	tests = ['zfs_written_property_001_pos']
	tags = ['functional', 'cli_root', 'zfs_property']

	[tests/functional/cli_root/zfs_receive]
	tests = ['zfs_receive_001_pos', 'zfs_receive_002_pos', 'zfs_receive_003_pos',
	'zfs_receive_004_neg', 'zfs_receive_005_neg', 'zfs_receive_006_pos',
	'zfs_receive_007_neg', 'zfs_receive_008_pos', 'zfs_receive_009_neg',
	'zfs_receive_010_pos', 'zfs_receive_011_pos', 'zfs_receive_012_pos',
	'zfs_receive_013_pos', 'zfs_receive_014_pos', 'zfs_receive_015_pos',
	'zfs_receive_016_pos', 'receive-o-x_props_override',
	'zfs_receive_from_encrypted', 'zfs_receive_to_encrypted',
	'zfs_receive_raw', 'zfs_receive_raw_incremental', 'zfs_receive_-e',
	'zfs_receive_raw_-d', 'zfs_receive_from_zstd', 'zfs_receive_new_props']
	tags = ['functional', 'cli_root', 'zfs_receive']

	[tests/functional/cli_root/zfs_rename]
	tests = ['zfs_rename_001_pos', 'zfs_rename_002_pos', 'zfs_rename_003_pos',
	'zfs_rename_004_neg', 'zfs_rename_005_neg', 'zfs_rename_006_pos',
	'zfs_rename_007_pos', 'zfs_rename_008_pos', 'zfs_rename_009_neg',
	'zfs_rename_010_neg', 'zfs_rename_011_pos', 'zfs_rename_012_neg',
	'zfs_rename_013_pos', 'zfs_rename_014_neg', 'zfs_rename_encrypted_child',
	'zfs_rename_to_encrypted', 'zfs_rename_mountpoint', 'zfs_rename_nounmount']
	tags = ['functional', 'cli_root', 'zfs_rename']

	[tests/functional/cli_root/zfs_reservation]
	tests = ['zfs_reservation_001_pos', 'zfs_reservation_002_pos']
	tags = ['functional', 'cli_root', 'zfs_reservation']

	[tests/functional/cli_root/zfs_rollback]
	tests = ['zfs_rollback_001_pos', 'zfs_rollback_002_pos',
	'zfs_rollback_003_neg', 'zfs_rollback_004_neg']
	tags = ['functional', 'cli_root', 'zfs_rollback']

	[tests/functional/cli_root/zfs_send]
	tests = ['zfs_send_001_pos', 'zfs_send_002_pos', 'zfs_send_003_pos',
	'zfs_send_004_neg', 'zfs_send_005_pos', 'zfs_send_006_pos',
	'zfs_send_007_pos', 'zfs_send_encrypted', 'zfs_send_raw',
	'zfs_send_sparse', 'zfs_send-b', 'zfs_send_skip_missing']
	tags = ['functional', 'cli_root', 'zfs_send']

	[tests/functional/cli_root/zfs_set]
	tests = ['cache_001_pos', 'cache_002_neg', 'canmount_001_pos',
	'canmount_002_pos', 'canmount_003_pos', 'canmount_004_pos',
	'checksum_001_pos', 'compression_001_pos', 'mountpoint_001_pos',
	'mountpoint_002_pos', 'reservation_001_neg', 'user_property_002_pos',
	'share_mount_001_neg', 'snapdir_001_pos', 'onoffs_001_pos',
	'user_property_001_pos', 'user_property_003_neg', 'readonly_001_pos',
	'user_property_004_pos', 'version_001_neg', 'zfs_set_001_neg',
	'zfs_set_002_neg', 'zfs_set_003_neg', 'property_alias_001_pos',
	'mountpoint_003_pos', 'ro_props_001_pos', 'zfs_set_keylocation',
	'zfs_set_feature_activation']
	tags = ['functional', 'cli_root', 'zfs_set']

	[tests/functional/cli_root/zfs_share]
	tests = ['zfs_share_001_pos', 'zfs_share_002_pos', 'zfs_share_003_pos',
	'zfs_share_004_pos', 'zfs_share_006_pos', 'zfs_share_008_neg',
	'zfs_share_010_neg', 'zfs_share_011_pos', 'zfs_share_concurrent_shares']
	tags = ['functional', 'cli_root', 'zfs_share']

	[tests/functional/cli_root/zfs_snapshot]
	tests = ['zfs_snapshot_001_neg', 'zfs_snapshot_002_neg',
	'zfs_snapshot_003_neg', 'zfs_snapshot_004_neg', 'zfs_snapshot_005_neg',
	'zfs_snapshot_006_pos', 'zfs_snapshot_007_neg', 'zfs_snapshot_008_neg',
	'zfs_snapshot_009_pos']
	tags = ['functional', 'cli_root', 'zfs_snapshot']

	[tests/functional/cli_root/zfs_unload-key]
	tests = ['zfs_unload-key', 'zfs_unload-key_all', 'zfs_unload-key_recursive']
	tags = ['functional', 'cli_root', 'zfs_unload-key']

	[tests/functional/cli_root/zfs_unmount]
	tests = ['zfs_unmount_001_pos', 'zfs_unmount_002_pos', 'zfs_unmount_003_pos',
	'zfs_unmount_004_pos', 'zfs_unmount_005_pos', 'zfs_unmount_006_pos',
	'zfs_unmount_007_neg', 'zfs_unmount_008_neg', 'zfs_unmount_009_pos',
	'zfs_unmount_all_001_pos', 'zfs_unmount_nested', 'zfs_unmount_unload_keys']
	tags = ['functional', 'cli_root', 'zfs_unmount']

	[tests/functional/cli_root/zfs_unshare]
	tests = ['zfs_unshare_001_pos', 'zfs_unshare_002_pos', 'zfs_unshare_003_pos',
	'zfs_unshare_004_neg', 'zfs_unshare_005_neg', 'zfs_unshare_006_pos',
	'zfs_unshare_007_pos']
	tags = ['functional', 'cli_root', 'zfs_unshare']

	[tests/functional/cli_root/zfs_upgrade]
	tests = ['zfs_upgrade_001_pos', 'zfs_upgrade_002_pos', 'zfs_upgrade_003_pos',
	'zfs_upgrade_004_pos', 'zfs_upgrade_005_pos', 'zfs_upgrade_006_neg',
	'zfs_upgrade_007_neg']
	tags = ['functional', 'cli_root', 'zfs_upgrade']

	[tests/functional/cli_root/zfs_wait]
	tests = ['zfs_wait_deleteq']
	tags = ['functional', 'cli_root', 'zfs_wait']

	[tests/functional/cli_root/zpool]
	tests = ['zpool_001_neg', 'zpool_002_pos', 'zpool_003_pos', 'zpool_colors']
	tags = ['functional', 'cli_root', 'zpool']

	[tests/functional/cli_root/zpool_add]
	tests = ['zpool_add_001_pos', 'zpool_add_002_pos', 'zpool_add_003_pos',
	'zpool_add_004_pos', 'zpool_add_006_pos', 'zpool_add_007_neg',
	'zpool_add_008_neg', 'zpool_add_009_neg', 'zpool_add_010_pos',
	'add-o_ashift', 'add_prop_ashift', 'zpool_add_dryrun_output']
	tags = ['functional', 'cli_root', 'zpool_add']

	[tests/functional/cli_root/zpool_attach]
	tests = ['zpool_attach_001_neg', 'attach-o_ashift']
	tags = ['functional', 'cli_root', 'zpool_attach']

	[tests/functional/cli_root/zpool_clear]
	tests = ['zpool_clear_001_pos', 'zpool_clear_002_neg', 'zpool_clear_003_neg',
	'zpool_clear_readonly']
	tags = ['functional', 'cli_root', 'zpool_clear']

	[tests/functional/cli_root/zpool_create]
	tests = ['zpool_create_001_pos', 'zpool_create_002_pos',
	'zpool_create_003_pos', 'zpool_create_004_pos', 'zpool_create_005_pos',
	'zpool_create_006_pos', 'zpool_create_007_neg', 'zpool_create_008_pos',
	'zpool_create_009_neg', 'zpool_create_010_neg', 'zpool_create_011_neg',
	'zpool_create_012_neg', 'zpool_create_014_neg', 'zpool_create_015_neg',
	'zpool_create_017_neg', 'zpool_create_018_pos', 'zpool_create_019_pos',
	'zpool_create_020_pos', 'zpool_create_021_pos', 'zpool_create_022_pos',
	'zpool_create_023_neg', 'zpool_create_024_pos',
	'zpool_create_encrypted', 'zpool_create_crypt_combos',
	'zpool_create_draid_001_pos', 'zpool_create_draid_002_pos',
	'zpool_create_draid_003_pos', 'zpool_create_draid_004_pos',
	'zpool_create_features_001_pos', 'zpool_create_features_002_pos',
	'zpool_create_features_003_pos', 'zpool_create_features_004_neg',
	'zpool_create_features_005_pos', 'zpool_create_features_006_pos',
	'zpool_create_features_007_pos', 'zpool_create_features_008_pos',
	'zpool_create_features_009_pos', 'create-o_ashift',
	'zpool_create_tempname', 'zpool_create_dryrun_output']
	tags = ['functional', 'cli_root', 'zpool_create']

	[tests/functional/cli_root/zpool_destroy]
	tests = ['zpool_destroy_001_pos', 'zpool_destroy_002_pos',
	'zpool_destroy_003_neg']
	pre =
	post =
	tags = ['functional', 'cli_root', 'zpool_destroy']

	[tests/functional/cli_root/zpool_detach]
	tests = ['zpool_detach_001_neg']
	tags = ['functional', 'cli_root', 'zpool_detach']

	[tests/functional/cli_root/zpool_events]
	tests = ['zpool_events_clear', 'zpool_events_cliargs', 'zpool_events_follow',
	'zpool_events_poolname', 'zpool_events_errors', 'zpool_events_duplicates',
	'zpool_events_clear_retained']
	tags = ['functional', 'cli_root', 'zpool_events']

	[tests/functional/cli_root/zpool_export]
	tests = ['zpool_export_001_pos', 'zpool_export_002_pos',
	'zpool_export_003_neg', 'zpool_export_004_pos']
	tags = ['functional', 'cli_root', 'zpool_export']

	[tests/functional/cli_root/zpool_get]
	tests = ['zpool_get_001_pos', 'zpool_get_002_pos', 'zpool_get_003_pos',
	'zpool_get_004_neg', 'zpool_get_005_pos']
	tags = ['functional', 'cli_root', 'zpool_get']

	[tests/functional/cli_root/zpool_history]
	tests = ['zpool_history_001_neg', 'zpool_history_002_pos']
	tags = ['functional', 'cli_root', 'zpool_history']

	[tests/functional/cli_root/zpool_import]
	tests = ['zpool_import_001_pos', 'zpool_import_002_pos',
	'zpool_import_003_pos', 'zpool_import_004_pos', 'zpool_import_005_pos',
	'zpool_import_006_pos', 'zpool_import_007_pos', 'zpool_import_008_pos',
	'zpool_import_009_neg', 'zpool_import_010_pos', 'zpool_import_011_neg',
	'zpool_import_012_pos', 'zpool_import_013_neg', 'zpool_import_014_pos',
	'zpool_import_015_pos', 'zpool_import_016_pos', 'zpool_import_017_pos',
	'zpool_import_features_001_pos', 'zpool_import_features_002_neg',
	'zpool_import_features_003_pos', 'zpool_import_missing_001_pos',
	'zpool_import_missing_002_pos', 'zpool_import_missing_003_pos',
	'zpool_import_rename_001_pos', 'zpool_import_all_001_pos',
	'zpool_import_encrypted', 'zpool_import_encrypted_load',
	'zpool_import_errata3', 'zpool_import_errata4',
	'import_cachefile_device_added',
	'import_cachefile_device_removed',
	'import_cachefile_device_replaced',
	'import_cachefile_mirror_attached',
	'import_cachefile_mirror_detached',
	'import_cachefile_paths_changed',
	'import_cachefile_shared_device',
	'import_devices_missing',
	'import_paths_changed',
	'import_rewind_config_changed',
	'import_rewind_device_replaced']
	tags = ['functional', 'cli_root', 'zpool_import']
	timeout = 1200

	[tests/functional/cli_root/zpool_labelclear]
	tests = ['zpool_labelclear_active', 'zpool_labelclear_exported',
	'zpool_labelclear_removed', 'zpool_labelclear_valid']
	pre =
	post =
	tags = ['functional', 'cli_root', 'zpool_labelclear']

	[tests/functional/cli_root/zpool_initialize]
	tests = ['zpool_initialize_attach_detach_add_remove',
	'zpool_initialize_fault_export_import_online',
	'zpool_initialize_import_export',
	'zpool_initialize_offline_export_import_online',
	'zpool_initialize_online_offline',
	'zpool_initialize_split',
	'zpool_initialize_start_and_cancel_neg',
	'zpool_initialize_start_and_cancel_pos',
	'zpool_initialize_suspend_resume',
	'zpool_initialize_unsupported_vdevs',
	'zpool_initialize_verify_checksums',
	'zpool_initialize_verify_initialized']
	pre =
	tags = ['functional', 'cli_root', 'zpool_initialize']

	[tests/functional/cli_root/zpool_offline]
	tests = ['zpool_offline_001_pos', 'zpool_offline_002_neg',
	'zpool_offline_003_pos']
	tags = ['functional', 'cli_root', 'zpool_offline']

	[tests/functional/cli_root/zpool_online]
	tests = ['zpool_online_001_pos', 'zpool_online_002_neg']
	tags = ['functional', 'cli_root', 'zpool_online']

	[tests/functional/cli_root/zpool_remove]
	tests = ['zpool_remove_001_neg', 'zpool_remove_002_pos',
	'zpool_remove_003_pos']
	tags = ['functional', 'cli_root', 'zpool_remove']

	[tests/functional/cli_root/zpool_replace]
	tests = ['zpool_replace_001_neg', 'replace-o_ashift', 'replace_prop_ashift']
	tags = ['functional', 'cli_root', 'zpool_replace']

	[tests/functional/cli_root/zpool_resilver]
	tests = ['zpool_resilver_bad_args', 'zpool_resilver_restart']
	tags = ['functional', 'cli_root', 'zpool_resilver']

	[tests/functional/cli_root/zpool_scrub]
	tests = ['zpool_scrub_001_neg', 'zpool_scrub_002_pos', 'zpool_scrub_003_pos',
	'zpool_scrub_004_pos', 'zpool_scrub_005_pos',
	'zpool_scrub_encrypted_unloaded', 'zpool_scrub_print_repairing',
	'zpool_scrub_offline_device', 'zpool_scrub_multiple_copies']
	tags = ['functional', 'cli_root', 'zpool_scrub']

	[tests/functional/cli_root/zpool_set]
	tests = ['zpool_set_001_pos', 'zpool_set_002_neg', 'zpool_set_003_neg',
	'zpool_set_ashift', 'zpool_set_features']
	tags = ['functional', 'cli_root', 'zpool_set']

	[tests/functional/cli_root/zpool_split]
	tests = ['zpool_split_cliargs', 'zpool_split_devices',
	'zpool_split_encryption', 'zpool_split_props', 'zpool_split_vdevs',
	'zpool_split_resilver', 'zpool_split_indirect',
	'zpool_split_dryrun_output']
	tags = ['functional', 'cli_root', 'zpool_split']

	[tests/functional/cli_root/zpool_status]
	tests = ['zpool_status_001_pos', 'zpool_status_002_pos',
	'zpool_status_features_001_pos']
	tags = ['functional', 'cli_root', 'zpool_status']

	[tests/functional/cli_root/zpool_sync]
	tests = ['zpool_sync_001_pos', 'zpool_sync_002_neg']
	tags = ['functional', 'cli_root', 'zpool_sync']

	[tests/functional/cli_root/zpool_trim]
	tests = ['zpool_trim_attach_detach_add_remove',
	'zpool_trim_fault_export_import_online',
	'zpool_trim_import_export', 'zpool_trim_multiple', 'zpool_trim_neg',
	'zpool_trim_offline_export_import_online', 'zpool_trim_online_offline',
	'zpool_trim_partial', 'zpool_trim_rate', 'zpool_trim_rate_neg',
	'zpool_trim_secure', 'zpool_trim_split', 'zpool_trim_start_and_cancel_neg',
	'zpool_trim_start_and_cancel_pos', 'zpool_trim_suspend_resume',
	'zpool_trim_unsupported_vdevs', 'zpool_trim_verify_checksums',
	'zpool_trim_verify_trimmed']
	tags = ['functional', 'zpool_trim']

	[tests/functional/cli_root/zpool_upgrade]
	tests = ['zpool_upgrade_001_pos', 'zpool_upgrade_002_pos',
	'zpool_upgrade_003_pos', 'zpool_upgrade_004_pos',
	'zpool_upgrade_005_neg', 'zpool_upgrade_006_neg',
	'zpool_upgrade_007_pos', 'zpool_upgrade_008_pos',
	'zpool_upgrade_009_neg', 'zpool_upgrade_features_001_pos']
	tags = ['functional', 'cli_root', 'zpool_upgrade']

	[tests/functional/cli_root/zpool_wait]
	tests = ['zpool_wait_discard', 'zpool_wait_freeing',
	'zpool_wait_initialize_basic', 'zpool_wait_initialize_cancel',
	'zpool_wait_initialize_flag', 'zpool_wait_multiple',
	'zpool_wait_no_activity', 'zpool_wait_remove', 'zpool_wait_remove_cancel',
	'zpool_wait_trim_basic', 'zpool_wait_trim_cancel', 'zpool_wait_trim_flag',
	'zpool_wait_usage']
	tags = ['functional', 'cli_root', 'zpool_wait']

	[tests/functional/cli_root/zpool_wait/scan]
	tests = ['zpool_wait_replace_cancel', 'zpool_wait_rebuild',
	'zpool_wait_resilver', 'zpool_wait_scrub_cancel',
	'zpool_wait_replace', 'zpool_wait_scrub_basic', 'zpool_wait_scrub_flag']
	tags = ['functional', 'cli_root', 'zpool_wait']

	[tests/functional/cli_user/misc]
	tests = ['zdb_001_neg', 'zfs_001_neg', 'zfs_allow_001_neg',
	'zfs_clone_001_neg', 'zfs_create_001_neg', 'zfs_destroy_001_neg',
	'zfs_get_001_neg', 'zfs_inherit_001_neg', 'zfs_mount_001_neg',
	'zfs_promote_001_neg', 'zfs_receive_001_neg', 'zfs_rename_001_neg',
	'zfs_rollback_001_neg', 'zfs_send_001_neg', 'zfs_set_001_neg',
	'zfs_share_001_neg', 'zfs_snapshot_001_neg', 'zfs_unallow_001_neg',
	'zfs_unmount_001_neg', 'zfs_unshare_001_neg', 'zfs_upgrade_001_neg',
	'zpool_001_neg', 'zpool_add_001_neg', 'zpool_attach_001_neg',
	'zpool_clear_001_neg', 'zpool_create_001_neg', 'zpool_destroy_001_neg',
	'zpool_detach_001_neg', 'zpool_export_001_neg', 'zpool_get_001_neg',
	'zpool_history_001_neg', 'zpool_import_001_neg', 'zpool_import_002_neg',
	'zpool_offline_001_neg', 'zpool_online_001_neg', 'zpool_remove_001_neg',
	'zpool_replace_001_neg', 'zpool_scrub_001_neg', 'zpool_set_001_neg',
	'zpool_status_001_neg', 'zpool_upgrade_001_neg', 'arcstat_001_pos',
	'arc_summary_001_pos', 'arc_summary_002_neg', 'zpool_wait_privilege']
	user =
	tags = ['functional', 'cli_user', 'misc']

	[tests/functional/cli_user/zfs_list]
	tests = ['zfs_list_001_pos', 'zfs_list_002_pos', 'zfs_list_003_pos',
	'zfs_list_004_neg', 'zfs_list_007_pos', 'zfs_list_008_neg']
	user =
	tags = ['functional', 'cli_user', 'zfs_list']

	[tests/functional/cli_user/zpool_iostat]
	tests = ['zpool_iostat_001_neg', 'zpool_iostat_002_pos',
	'zpool_iostat_003_neg', 'zpool_iostat_004_pos',
	'zpool_iostat_005_pos', 'zpool_iostat_-c_disable',
	'zpool_iostat_-c_homedir', 'zpool_iostat_-c_searchpath']
	user =
	tags = ['functional', 'cli_user', 'zpool_iostat']

	[tests/functional/cli_user/zpool_list]
	tests = ['zpool_list_001_pos', 'zpool_list_002_neg']
	user =
	tags = ['functional', 'cli_user', 'zpool_list']

	[tests/functional/cli_user/zpool_status]
	tests = ['zpool_status_003_pos', 'zpool_status_-c_disable',
	'zpool_status_-c_homedir', 'zpool_status_-c_searchpath']
	user =
	tags = ['functional', 'cli_user', 'zpool_status']

	[tests/functional/compression]
	tests = ['compress_001_pos', 'compress_002_pos', 'compress_003_pos',
	'l2arc_compressed_arc', 'l2arc_compressed_arc_disabled',
	'l2arc_encrypted', 'l2arc_encrypted_no_compressed_arc']
	tags = ['functional', 'compression']

	[tests/functional/cp_files]
	tests = ['cp_files_001_pos']
	tags = ['functional', 'cp_files']

	+[tests/functional/crtime]
	+tests = ['crtime_001_pos' ]
	+tags = ['functional', 'crtime']
	+
	[tests/functional/ctime]
	tests = ['ctime_001_pos' ]
	tags = ['functional', 'ctime']

	[tests/functional/deadman]
	tests = ['deadman_ratelimit', 'deadman_sync', 'deadman_zio']
	pre =
	post =
	tags = ['functional', 'deadman']

	[tests/functional/delegate]
	tests = ['zfs_allow_001_pos', 'zfs_allow_002_pos', 'zfs_allow_003_pos',
	'zfs_allow_004_pos', 'zfs_allow_005_pos', 'zfs_allow_006_pos',
	'zfs_allow_007_pos', 'zfs_allow_008_pos', 'zfs_allow_009_neg',
	'zfs_allow_010_pos', 'zfs_allow_011_neg', 'zfs_allow_012_neg',
	'zfs_unallow_001_pos', 'zfs_unallow_002_pos', 'zfs_unallow_003_pos',
	'zfs_unallow_004_pos', 'zfs_unallow_005_pos', 'zfs_unallow_006_pos',
	'zfs_unallow_007_neg', 'zfs_unallow_008_neg']
	tags = ['functional', 'delegate']

	[tests/functional/exec]
	tests = ['exec_001_pos', 'exec_002_neg']
	tags = ['functional', 'exec']

	[tests/functional/features/async_destroy]
	tests = ['async_destroy_001_pos']
	tags = ['functional', 'features', 'async_destroy']

	[tests/functional/features/large_dnode]
	tests = ['large_dnode_001_pos', 'large_dnode_003_pos', 'large_dnode_004_neg',
	'large_dnode_005_pos', 'large_dnode_007_neg', 'large_dnode_009_pos']
	tags = ['functional', 'features', 'large_dnode']

	[tests/functional/grow]
	pre =
	post =
	tests = ['grow_pool_001_pos', 'grow_replicas_001_pos']
	tags = ['functional', 'grow']

	[tests/functional/history]
	tests = ['history_001_pos', 'history_002_pos', 'history_003_pos',
	'history_004_pos', 'history_005_neg', 'history_006_neg',
	'history_007_pos', 'history_008_pos', 'history_009_pos',
	'history_010_pos']
	tags = ['functional', 'history']

	[tests/functional/hkdf]
	tests = ['run_hkdf_test']
	tags = ['functional', 'hkdf']

	[tests/functional/inheritance]
	tests = ['inherit_001_pos']
	pre =
	tags = ['functional', 'inheritance']

	[tests/functional/io]
	tests = ['sync', 'psync', 'posixaio', 'mmap']
	tags = ['functional', 'io']

	[tests/functional/inuse]
	tests = ['inuse_004_pos', 'inuse_005_pos', 'inuse_008_pos', 'inuse_009_pos']
	post =
	tags = ['functional', 'inuse']

	[tests/functional/large_files]
	tests = ['large_files_001_pos', 'large_files_002_pos']
	tags = ['functional', 'large_files']

	[tests/functional/largest_pool]
	tests = ['largest_pool_001_pos']
	pre =
	post =
	tags = ['functional', 'largest_pool']

	[tests/functional/limits]
	tests = ['filesystem_count', 'filesystem_limit', 'snapshot_count',
	'snapshot_limit']
	tags = ['functional', 'limits']

	[tests/functional/link_count]
	tests = ['link_count_001', 'link_count_root_inode']
	tags = ['functional', 'link_count']

	[tests/functional/migration]
	tests = ['migration_001_pos', 'migration_002_pos', 'migration_003_pos',
	'migration_004_pos', 'migration_005_pos', 'migration_006_pos',
	'migration_007_pos', 'migration_008_pos', 'migration_009_pos',
	'migration_010_pos', 'migration_011_pos', 'migration_012_pos']
	tags = ['functional', 'migration']

	[tests/functional/mmap]
	tests = ['mmap_write_001_pos', 'mmap_read_001_pos']
	tags = ['functional', 'mmap']

	[tests/functional/mount]
	tests = ['umount_001', 'umountall_001']
	tags = ['functional', 'mount']

	[tests/functional/mv_files]
	tests = ['mv_files_001_pos', 'mv_files_002_pos', 'random_creation']
	tags = ['functional', 'mv_files']

	[tests/functional/nestedfs]
	tests = ['nestedfs_001_pos']
	tags = ['functional', 'nestedfs']

	[tests/functional/no_space]
	tests = ['enospc_001_pos', 'enospc_002_pos', 'enospc_003_pos',
	'enospc_df']
	tags = ['functional', 'no_space']

	[tests/functional/nopwrite]
	tests = ['nopwrite_copies', 'nopwrite_mtime', 'nopwrite_negative',
	'nopwrite_promoted_clone', 'nopwrite_recsize', 'nopwrite_sync',
	'nopwrite_varying_compression', 'nopwrite_volume']
	tags = ['functional', 'nopwrite']

	[tests/functional/online_offline]
	tests = ['online_offline_001_pos', 'online_offline_002_neg',
	'online_offline_003_neg']
	tags = ['functional', 'online_offline']

	[tests/functional/pool_checkpoint]
	tests = ['checkpoint_after_rewind', 'checkpoint_big_rewind',
	'checkpoint_capacity', 'checkpoint_conf_change', 'checkpoint_discard',
	'checkpoint_discard_busy', 'checkpoint_discard_many',
	'checkpoint_indirect', 'checkpoint_invalid', 'checkpoint_lun_expsz',
	'checkpoint_open', 'checkpoint_removal', 'checkpoint_rewind',
	'checkpoint_ro_rewind', 'checkpoint_sm_scale', 'checkpoint_twice',
	'checkpoint_vdev_add', 'checkpoint_zdb', 'checkpoint_zhack_feat']
	tags = ['functional', 'pool_checkpoint']
	timeout = 1800

	[tests/functional/pool_names]
	tests = ['pool_names_001_pos', 'pool_names_002_neg']
	pre =
	post =
	tags = ['functional', 'pool_names']

	[tests/functional/poolversion]
	tests = ['poolversion_001_pos', 'poolversion_002_pos']
	tags = ['functional', 'poolversion']

	[tests/functional/pyzfs]
	tests = ['pyzfs_unittest']
	pre =
	post =
	tags = ['functional', 'pyzfs']

	[tests/functional/quota]
	tests = ['quota_001_pos', 'quota_002_pos', 'quota_003_pos',
	'quota_004_pos', 'quota_005_pos', 'quota_006_neg']
	tags = ['functional', 'quota']

	[tests/functional/redacted_send]
	tests = ['redacted_compressed', 'redacted_contents', 'redacted_deleted',
	'redacted_disabled_feature', 'redacted_embedded', 'redacted_holes',
	'redacted_incrementals', 'redacted_largeblocks', 'redacted_many_clones',
	'redacted_mixed_recsize', 'redacted_mounts', 'redacted_negative',
	'redacted_origin', 'redacted_panic', 'redacted_props', 'redacted_resume',
	'redacted_size', 'redacted_volume']
	tags = ['functional', 'redacted_send']

	[tests/functional/raidz]
	tests = ['raidz_001_neg', 'raidz_002_pos', 'raidz_003_pos', 'raidz_004_pos']
	tags = ['functional', 'raidz']

	[tests/functional/redundancy]
	tests = ['redundancy_draid', 'redundancy_draid1', 'redundancy_draid2',
	'redundancy_draid3', 'redundancy_draid_damaged', 'redundancy_draid_spare1',
	'redundancy_draid_spare2', 'redundancy_draid_spare3', 'redundancy_mirror',
	'redundancy_raidz', 'redundancy_raidz1', 'redundancy_raidz2',
	'redundancy_raidz3', 'redundancy_stripe']
	tags = ['functional', 'redundancy']
	timeout = 1200

	[tests/functional/refquota]
	tests = ['refquota_001_pos', 'refquota_002_pos', 'refquota_003_pos',
	'refquota_004_pos', 'refquota_005_pos', 'refquota_006_neg',
	'refquota_007_neg', 'refquota_008_neg']
	tags = ['functional', 'refquota']

	[tests/functional/refreserv]
	tests = ['refreserv_001_pos', 'refreserv_002_pos', 'refreserv_003_pos',
	'refreserv_004_pos', 'refreserv_005_pos', 'refreserv_multi_raidz',
	'refreserv_raidz']
	tags = ['functional', 'refreserv']

	[tests/functional/removal]
	pre =
	tests = ['removal_all_vdev', 'removal_cancel', 'removal_check_space',
	'removal_condense_export', 'removal_multiple_indirection',
	'removal_nopwrite', 'removal_remap_deadlists',
	'removal_resume_export', 'removal_sanity', 'removal_with_add',
	'removal_with_create_fs', 'removal_with_dedup',
	'removal_with_errors', 'removal_with_export',
	'removal_with_ganging', 'removal_with_faulted',
	'removal_with_remove', 'removal_with_scrub', 'removal_with_send',
	'removal_with_send_recv', 'removal_with_snapshot',
	'removal_with_write', 'removal_with_zdb', 'remove_expanded',
	'remove_mirror', 'remove_mirror_sanity', 'remove_raidz',
	'remove_indirect', 'remove_attach_mirror']
	tags = ['functional', 'removal']

	[tests/functional/rename_dirs]
	tests = ['rename_dirs_001_pos']
	tags = ['functional', 'rename_dirs']

	[tests/functional/replacement]
	tests = ['attach_import', 'attach_multiple', 'attach_rebuild',
	'attach_resilver', 'detach', 'rebuild_disabled_feature',
	'rebuild_multiple', 'rebuild_raidz', 'replace_import', 'replace_rebuild',
	'replace_resilver', 'resilver_restart_001', 'resilver_restart_002',
	'scrub_cancel']
	tags = ['functional', 'replacement']

	[tests/functional/reservation]
	tests = ['reservation_001_pos', 'reservation_002_pos', 'reservation_003_pos',
	'reservation_004_pos', 'reservation_005_pos', 'reservation_006_pos',
	'reservation_007_pos', 'reservation_008_pos', 'reservation_009_pos',
	'reservation_010_pos', 'reservation_011_pos', 'reservation_012_pos',
	'reservation_013_pos', 'reservation_014_pos', 'reservation_015_pos',
	'reservation_016_pos', 'reservation_017_pos', 'reservation_018_pos',
	'reservation_019_pos', 'reservation_020_pos', 'reservation_021_neg',
	'reservation_022_pos']
	tags = ['functional', 'reservation']

	[tests/functional/rootpool]
	tests = ['rootpool_002_neg', 'rootpool_003_neg', 'rootpool_007_pos']
	tags = ['functional', 'rootpool']

	[tests/functional/rsend]
	tests = ['recv_dedup', 'recv_dedup_encrypted_zvol', 'rsend_001_pos',
	'rsend_002_pos', 'rsend_003_pos', 'rsend_004_pos', 'rsend_005_pos',
	'rsend_006_pos', 'rsend_007_pos', 'rsend_008_pos', 'rsend_009_pos',
	'rsend_010_pos', 'rsend_011_pos', 'rsend_012_pos', 'rsend_013_pos',
	'rsend_014_pos', 'rsend_016_neg', 'rsend_019_pos', 'rsend_020_pos',
	'rsend_021_pos', 'rsend_022_pos', 'rsend_024_pos',
	'send-c_verify_ratio', 'send-c_verify_contents', 'send-c_props',
	'send-c_incremental', 'send-c_volume', 'send-c_zstreamdump',
	'send-c_lz4_disabled', 'send-c_recv_lz4_disabled',
	'send-c_mixed_compression', 'send-c_stream_size_estimate',
	'send-c_embedded_blocks', 'send-c_resume', 'send-cpL_varied_recsize',
	'send-c_recv_dedup', 'send-L_toggle', 'send_encrypted_hierarchy',
	'send_encrypted_props', 'send_encrypted_truncated_files',
	'send_freeobjects', 'send_realloc_files',
	'send_realloc_encrypted_files', 'send_spill_block', 'send_holds',
	'send_hole_birth', 'send_mixed_raw', 'send-wR_encrypted_zvol',
	'send_partial_dataset', 'send_invalid', 'send_doall']
	tags = ['functional', 'rsend']

	[tests/functional/scrub_mirror]
	tests = ['scrub_mirror_001_pos', 'scrub_mirror_002_pos',
	'scrub_mirror_003_pos', 'scrub_mirror_004_pos']
	tags = ['functional', 'scrub_mirror']

	[tests/functional/slog]
	tests = ['slog_001_pos', 'slog_002_pos', 'slog_003_pos', 'slog_004_pos',
	'slog_005_pos', 'slog_006_pos', 'slog_007_pos', 'slog_008_neg',
	'slog_009_neg', 'slog_010_neg', 'slog_011_neg', 'slog_012_neg',
	'slog_013_pos', 'slog_014_pos', 'slog_015_neg', 'slog_replay_fs_001',
	'slog_replay_fs_002', 'slog_replay_volume']
	tags = ['functional', 'slog']

	[tests/functional/snapshot]
	tests = ['clone_001_pos', 'rollback_001_pos', 'rollback_002_pos',
	'rollback_003_pos', 'snapshot_001_pos', 'snapshot_002_pos',
	'snapshot_003_pos', 'snapshot_004_pos', 'snapshot_005_pos',
	'snapshot_006_pos', 'snapshot_007_pos', 'snapshot_008_pos',
	'snapshot_009_pos', 'snapshot_010_pos', 'snapshot_011_pos',
	'snapshot_012_pos', 'snapshot_013_pos', 'snapshot_014_pos',
	'snapshot_017_pos']
	tags = ['functional', 'snapshot']

	[tests/functional/snapused]
	tests = ['snapused_001_pos', 'snapused_002_pos', 'snapused_003_pos',
	'snapused_004_pos', 'snapused_005_pos']
	tags = ['functional', 'snapused']

	[tests/functional/sparse]
	tests = ['sparse_001_pos']
	tags = ['functional', 'sparse']

	[tests/functional/suid]
	tests = ['suid_write_to_suid', 'suid_write_to_sgid', 'suid_write_to_suid_sgid',
	'suid_write_to_none']
	tags = ['functional', 'suid']

	[tests/functional/threadsappend]
	tests = ['threadsappend_001_pos']
	tags = ['functional', 'threadsappend']

	[tests/functional/trim]
	tests = ['autotrim_integrity', 'autotrim_config', 'autotrim_trim_integrity',
	'trim_integrity', 'trim_config', 'trim_l2arc']
	tags = ['functional', 'trim']

	[tests/functional/truncate]
	tests = ['truncate_001_pos', 'truncate_002_pos', 'truncate_timestamps']
	tags = ['functional', 'truncate']

	[tests/functional/upgrade]
	tests = ['upgrade_userobj_001_pos', 'upgrade_readonly_pool']
	tags = ['functional', 'upgrade']

	[tests/functional/userquota]
	tests = [
	'userquota_001_pos', 'userquota_002_pos', 'userquota_003_pos',
	'userquota_004_pos', 'userquota_005_neg', 'userquota_006_pos',
	'userquota_007_pos', 'userquota_008_pos', 'userquota_009_pos',
	'userquota_010_pos', 'userquota_011_pos', 'userquota_012_neg',
	'userspace_001_pos', 'userspace_002_pos', 'userspace_encrypted']
	tags = ['functional', 'userquota']

	[tests/functional/vdev_zaps]
	tests = ['vdev_zaps_001_pos', 'vdev_zaps_002_pos', 'vdev_zaps_003_pos',
	'vdev_zaps_004_pos', 'vdev_zaps_005_pos', 'vdev_zaps_006_pos',
	'vdev_zaps_007_pos']
	tags = ['functional', 'vdev_zaps']

	[tests/functional/write_dirs]
	tests = ['write_dirs_001_pos', 'write_dirs_002_pos']
	tags = ['functional', 'write_dirs']

	[tests/functional/xattr]
	tests = ['xattr_001_pos', 'xattr_002_neg', 'xattr_003_neg', 'xattr_004_pos',
	'xattr_005_pos', 'xattr_006_pos', 'xattr_007_neg',
	'xattr_011_pos', 'xattr_012_pos', 'xattr_013_pos']
	tags = ['functional', 'xattr']

	[tests/functional/zvol/zvol_ENOSPC]
	tests = ['zvol_ENOSPC_001_pos']
	tags = ['functional', 'zvol', 'zvol_ENOSPC']

	[tests/functional/zvol/zvol_cli]
	tests = ['zvol_cli_001_pos', 'zvol_cli_002_pos', 'zvol_cli_003_neg']
	tags = ['functional', 'zvol', 'zvol_cli']

	[tests/functional/zvol/zvol_misc]
	tests = ['zvol_misc_002_pos', 'zvol_misc_hierarchy', 'zvol_misc_rename_inuse',
	'zvol_misc_snapdev', 'zvol_misc_volmode', 'zvol_misc_zil']
	tags = ['functional', 'zvol', 'zvol_misc']

	[tests/functional/zvol/zvol_swap]
	tests = ['zvol_swap_001_pos', 'zvol_swap_002_pos', 'zvol_swap_004_pos']
	tags = ['functional', 'zvol', 'zvol_swap']

	[tests/functional/libzfs]
	tests = ['many_fds', 'libzfs_input']
	tags = ['functional', 'libzfs']

	[tests/functional/log_spacemap]
	tests = ['log_spacemap_import_logs']
	pre =
	post =
	tags = ['functional', 'log_spacemap']

	[tests/functional/l2arc]
	tests = ['l2arc_arcstats_pos', 'l2arc_mfuonly_pos', 'l2arc_l2miss_pos',
	'persist_l2arc_001_pos', 'persist_l2arc_002_pos',
	- 'persist_l2arc_003_neg', 'persist_l2arc_004_pos', 'persist_l2arc_005_pos',
	- 'persist_l2arc_006_pos', 'persist_l2arc_007_pos', 'persist_l2arc_008_pos']
	+ 'persist_l2arc_003_neg', 'persist_l2arc_004_pos', 'persist_l2arc_005_pos']
	tags = ['functional', 'l2arc']

	[tests/functional/zpool_influxdb]
	tests = ['zpool_influxdb']
	tags = ['functional', 'zpool_influxdb']
	diff --git a/sys/contrib/openzfs/tests/runfiles/linux.run b/sys/contrib/openzfs/tests/runfiles/linux.run
	index c6d4f5f6d34e..642ed824d462 100644
	--- a/sys/contrib/openzfs/tests/runfiles/linux.run
	+++ b/sys/contrib/openzfs/tests/runfiles/linux.run
	@@ -1,173 +1,174 @@
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	[DEFAULT]
	pre = setup
	quiet = False
	pre_user = root
	user = root
	timeout = 600
	post_user = root
	post = cleanup
	failsafe_user = root
	failsafe = callbacks/zfs_failsafe
	outputdir = /var/tmp/test_results
	tags = ['functional']

	[tests/functional/acl/posix:Linux]
	tests = ['posix_001_pos', 'posix_002_pos', 'posix_003_pos', 'posix_004_pos']
	tags = ['functional', 'acl', 'posix']

	[tests/functional/acl/posix-sa:Linux]
	tests = ['posix_001_pos', 'posix_002_pos', 'posix_003_pos', 'posix_004_pos']
	tags = ['functional', 'acl', 'posix-sa']

	[tests/functional/atime:Linux]
	tests = ['atime_003_pos', 'root_relatime_on']
	tags = ['functional', 'atime']

	[tests/functional/chattr:Linux]
	tests = ['chattr_001_pos', 'chattr_002_neg']
	tags = ['functional', 'chattr']

	[tests/functional/checksum:Linux]
	tests = ['run_edonr_test']
	tags = ['functional', 'checksum']

	[tests/functional/cli_root/zfs:Linux]
	tests = ['zfs_003_neg']
	tags = ['functional', 'cli_root', 'zfs']

	[tests/functional/cli_root/zfs_mount:Linux]
	tests = ['zfs_mount_006_pos', 'zfs_mount_008_pos', 'zfs_mount_013_pos',
	'zfs_mount_014_neg', 'zfs_multi_mount']
	tags = ['functional', 'cli_root', 'zfs_mount']

	[tests/functional/cli_root/zfs_share:Linux]
	tests = ['zfs_share_005_pos', 'zfs_share_007_neg', 'zfs_share_009_neg',
	'zfs_share_012_pos']
	tags = ['functional', 'cli_root', 'zfs_share']

	[tests/functional/cli_root/zfs_sysfs:Linux]
	tests = ['zfeature_set_unsupported', 'zfs_get_unsupported',
	'zfs_set_unsupported', 'zfs_sysfs_live', 'zpool_get_unsupported',
	'zpool_set_unsupported']
	tags = ['functional', 'cli_root', 'zfs_sysfs']

	[tests/functional/cli_root/zpool_add:Linux]
	tests = ['add_nested_replacing_spare']
	tags = ['functional', 'cli_root', 'zpool_add']

	[tests/functional/cli_root/zpool_expand:Linux]
	tests = ['zpool_expand_001_pos', 'zpool_expand_002_pos',
	'zpool_expand_003_neg', 'zpool_expand_004_pos', 'zpool_expand_005_pos']
	tags = ['functional', 'cli_root', 'zpool_expand']

	[tests/functional/cli_root/zpool_reopen:Linux]
	tests = ['zpool_reopen_001_pos', 'zpool_reopen_002_pos',
	'zpool_reopen_003_pos', 'zpool_reopen_004_pos', 'zpool_reopen_005_pos',
	'zpool_reopen_006_neg', 'zpool_reopen_007_pos']
	tags = ['functional', 'cli_root', 'zpool_reopen']

	[tests/functional/cli_root/zpool_split:Linux]
	tests = ['zpool_split_wholedisk']
	tags = ['functional', 'cli_root', 'zpool_split']

	[tests/functional/compression:Linux]
	tests = ['compress_004_pos']
	tags = ['functional', 'compression']

	[tests/functional/devices:Linux]
	tests = ['devices_001_pos', 'devices_002_neg', 'devices_003_pos']
	tags = ['functional', 'devices']

	[tests/functional/events:Linux]
	tests = ['events_001_pos', 'events_002_pos', 'zed_rc_filter', 'zed_fd_spill']
	tags = ['functional', 'events']

	[tests/functional/fallocate:Linux]
	tests = ['fallocate_prealloc', 'fallocate_punch-hole']
	tags = ['functional', 'fallocate']

	[tests/functional/fault:Linux]
	-tests = ['auto_offline_001_pos', 'auto_online_001_pos', 'auto_replace_001_pos',
	- 'auto_spare_001_pos', 'auto_spare_002_pos', 'auto_spare_multiple',
	- 'auto_spare_ashift', 'auto_spare_shared', 'decrypt_fault',
	- 'decompress_fault', 'scrub_after_resilver', 'zpool_status_-s']
	+tests = ['auto_offline_001_pos', 'auto_online_001_pos', 'auto_online_002_pos',
	+ 'auto_replace_001_pos', 'auto_spare_001_pos', 'auto_spare_002_pos',
	+ 'auto_spare_multiple', 'auto_spare_ashift', 'auto_spare_shared',
	+ 'decrypt_fault', 'decompress_fault', 'scrub_after_resilver',
	+ 'zpool_status_-s']
	tags = ['functional', 'fault']

	[tests/functional/features/large_dnode:Linux]
	tests = ['large_dnode_002_pos', 'large_dnode_006_pos', 'large_dnode_008_pos']
	tags = ['functional', 'features', 'large_dnode']

	[tests/functional/io:Linux]
	tests = ['libaio', 'io_uring']
	tags = ['functional', 'io']

	[tests/functional/mmap:Linux]
	tests = ['mmap_libaio_001_pos']
	tags = ['functional', 'mmap']

	[tests/functional/mmp:Linux]
	tests = ['mmp_on_thread', 'mmp_on_uberblocks', 'mmp_on_off', 'mmp_interval',
	'mmp_active_import', 'mmp_inactive_import', 'mmp_exported_import',
	'mmp_write_uberblocks', 'mmp_reset_interval', 'multihost_history',
	'mmp_on_zdb', 'mmp_write_distribution', 'mmp_hostid']
	tags = ['functional', 'mmp']

	[tests/functional/mount:Linux]
	tests = ['umount_unlinked_drain']
	tags = ['functional', 'mount']

	[tests/functional/pam:Linux]
	tests = ['pam_basic', 'pam_nounmount']
	tags = ['functional', 'pam']

	[tests/functional/procfs:Linux]
	tests = ['procfs_list_basic', 'procfs_list_concurrent_readers',
	'procfs_list_stale_read', 'pool_state']
	tags = ['functional', 'procfs']

	[tests/functional/projectquota:Linux]
	tests = ['projectid_001_pos', 'projectid_002_pos', 'projectid_003_pos',
	'projectquota_001_pos', 'projectquota_002_pos', 'projectquota_003_pos',
	'projectquota_004_neg', 'projectquota_005_pos', 'projectquota_006_pos',
	'projectquota_007_pos', 'projectquota_008_pos', 'projectquota_009_pos',
	'projectspace_001_pos', 'projectspace_002_pos', 'projectspace_003_pos',
	'projectspace_004_pos',
	'projecttree_001_pos', 'projecttree_002_pos', 'projecttree_003_neg']
	tags = ['functional', 'projectquota']

	[tests/functional/rsend:Linux]
	tests = ['send_realloc_dnode_size', 'send_encrypted_files']
	tags = ['functional', 'rsend']

	[tests/functional/snapshot:Linux]
	tests = ['snapshot_015_pos', 'snapshot_016_pos']
	tags = ['functional', 'snapshot']

	[tests/functional/tmpfile:Linux]
	tests = ['tmpfile_001_pos', 'tmpfile_002_pos', 'tmpfile_003_pos',
	'tmpfile_stat_mode']
	tags = ['functional', 'tmpfile']

	[tests/functional/upgrade:Linux]
	tests = ['upgrade_projectquota_001_pos']
	tags = ['functional', 'upgrade']

	[tests/functional/user_namespace:Linux]
	tests = ['user_namespace_001']
	tags = ['functional', 'user_namespace']

	[tests/functional/userquota:Linux]
	tests = ['groupspace_001_pos', 'groupspace_002_pos', 'groupspace_003_pos',
	'userquota_013_pos', 'userspace_003_pos']
	tags = ['functional', 'userquota']
	diff --git a/sys/contrib/openzfs/tests/test-runner/bin/zts-report.py.in b/sys/contrib/openzfs/tests/test-runner/bin/zts-report.py.in
	index 27c865ed5c7a..cc1ee6db0913 100755
	--- a/sys/contrib/openzfs/tests/test-runner/bin/zts-report.py.in
	+++ b/sys/contrib/openzfs/tests/test-runner/bin/zts-report.py.in
	@@ -1,448 +1,447 @@
	#!/usr/bin/env @PYTHON_SHEBANG@

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	# Copyright (c) 2017 by Delphix. All rights reserved.
	# Copyright (c) 2018 by Lawrence Livermore National Security, LLC.
	#
	# This script must remain compatible with Python 2.6+ and Python 3.4+.
	#

	import os
	import re
	import sys

	#
	# This script parses the stdout of zfstest, which has this format:
	#
	# Test: /path/to/testa (run as root) [00:00] [PASS]
	# Test: /path/to/testb (run as jkennedy) [00:00] [PASS]
	# Test: /path/to/testc (run as root) [00:00] [FAIL]
	# [...many more results...]
	#
	# Results Summary
	# FAIL 22
	# SKIP 32
	# PASS 1156
	#
	# Running Time: 02:50:31
	# Percent passed: 95.5%
	# Log directory: /var/tmp/test_results/20180615T205926
	#

	#
	# Common generic reasons for a test or test group to be skipped.
	#
	# Some test cases are known to fail in ways which are not harmful or dangerous.
	# In these cases simply mark the test as a known failure until it can be
	# updated and the issue resolved. Note that it's preferable to open a unique
	# issue on the GitHub issue tracker for each test case failure.
	#
	known_reason = 'Known issue'

	#
	# Some tests require that a test user be able to execute the zfs utilities.
	# This may not be possible when testing in-tree due to the default permissions
	# on the user's home directory. When testing this can be resolved by granting
	# group read access.
	#
	# chmod 0750 $HOME
	#
	exec_reason = 'Test user execute permissions required for utilities'

	#
	# Some tests require a minimum python version of 3.5 and will be skipped when
	# the default system version is too old. There may also be tests which require
	# additional python modules be installed, for example python-cffi is required
	# by the pyzfs tests.
	#
	python_reason = 'Python v3.5 or newer required'
	python_deps_reason = 'Python modules missing: python-cffi'

	#
	# Some tests require the O_TMPFILE flag which was first introduced in the
	# 3.11 kernel.
	#
	tmpfile_reason = 'Kernel O_TMPFILE support required'

	+#
	+# Some tests require the statx(2) system call on Linux which was first
	+# introduced in the 4.11 kernel.
	+#
	+statx_reason = 'Kernel statx(2) system call required on Linux'
	+
	#
	# Some tests require that the NFS client and server utilities be installed.
	#
	share_reason = 'NFS client and server utilities required'

	#
	# Some tests require that the lsattr utility support the project id feature.
	#
	project_id_reason = 'lsattr with set/show project ID required'

	#
	# Some tests require that the kernel support user namespaces.
	#
	user_ns_reason = 'Kernel user namespace support required'

	#
	# Some rewind tests can fail since nothing guarantees that old MOS blocks
	# are not overwritten. Snapshots protect datasets and data files but not
	# the MOS. Reasonable efforts are made in the test case to increase the
	# odds that some txgs will have their MOS data left untouched, but it is
	# never a sure thing.
	#
	rewind_reason = 'Arbitrary pool rewind is not guaranteed'

	#
	# Some tests may by structured in a way that relies on exact knowledge
	# of how much free space in available in a pool. These tests cannot be
	# made completely reliable because the internal details of how free space
	# is managed are not exposed to user space.
	#
	enospc_reason = 'Exact free space reporting is not guaranteed'

	#
	# Some tests require a minimum version of the fio benchmark utility.
	# Older distributions such as CentOS 6.x only provide fio-2.0.13.
	#
	fio_reason = 'Fio v2.3 or newer required'

	#
	# Some tests require that the DISKS provided support the discard operation.
	# Normally this is not an issue because loop back devices are used for DISKS
	# and they support discard (TRIM/UNMAP).
	#
	trim_reason = 'DISKS must support discard (TRIM/UNMAP)'

	#
	# Some tests are not applicable to a platform or need to be updated to operate
	# in the manor required by the platform. Any tests which are skipped for this
	# reason will be suppressed in the final analysis output.
	#
	na_reason = "Not applicable"

	#
	# Some test cases doesn't have all requirements to run on Github actions CI.
	#
	ci_reason = 'CI runner doesn\'t have all requirements'

	summary = {
	'total': float(0),
	'passed': float(0),
	'logfile': "Could not determine logfile location."
	}

	#
	# These tests are known to fail, thus we use this list to prevent these
	# failures from failing the job as a whole; only unexpected failures
	# bubble up to cause this script to exit with a non-zero exit status.
	#
	# Format: { 'test-name': ['expected result', 'issue-number \| reason'] }
	#
	# For each known failure it is recommended to link to a GitHub issue by
	# setting the reason to the issue number. Alternately, one of the generic
	# reasons listed above can be used.
	#
	known = {
	'casenorm/mixed_none_lookup_ci': ['FAIL', '7633'],
	'casenorm/mixed_formd_lookup_ci': ['FAIL', '7633'],
	'cli_root/zfs_unshare/zfs_unshare_002_pos': ['SKIP', na_reason],
	'cli_root/zfs_unshare/zfs_unshare_006_pos': ['SKIP', na_reason],
	'cli_user/misc/zfs_share_001_neg': ['SKIP', na_reason],
	'cli_user/misc/zfs_unshare_001_neg': ['SKIP', na_reason],
	'privilege/setup': ['SKIP', na_reason],
	'refreserv/refreserv_004_pos': ['FAIL', known_reason],
	'rootpool/setup': ['SKIP', na_reason],
	'rsend/rsend_008_pos': ['SKIP', '6066'],
	'vdev_zaps/vdev_zaps_007_pos': ['FAIL', known_reason],
	}

	if sys.platform.startswith('freebsd'):
	known.update({
	'cli_root/zpool_wait/zpool_wait_trim_basic': ['SKIP', trim_reason],
	'cli_root/zpool_wait/zpool_wait_trim_cancel': ['SKIP', trim_reason],
	'cli_root/zpool_wait/zpool_wait_trim_flag': ['SKIP', trim_reason],
	'link_count/link_count_001': ['SKIP', na_reason],
	})
	elif sys.platform.startswith('linux'):
	known.update({
	'casenorm/mixed_formd_lookup': ['FAIL', '7633'],
	'casenorm/mixed_formd_delete': ['FAIL', '7633'],
	'casenorm/sensitive_formd_lookup': ['FAIL', '7633'],
	'casenorm/sensitive_formd_delete': ['FAIL', '7633'],
	'removal/removal_with_zdb': ['SKIP', known_reason],
	})


	#
	# These tests may occasionally fail or be skipped. We want there failures
	# to be reported but only unexpected failures should bubble up to cause
	# this script to exit with a non-zero exit status.
	#
	# Format: { 'test-name': ['expected result', 'issue-number \| reason'] }
	#
	# For each known failure it is recommended to link to a GitHub issue by
	# setting the reason to the issue number. Alternately, one of the generic
	# reasons listed above can be used.
	#
	maybe = {
	'chattr/setup': ['SKIP', exec_reason],
	+ 'crtime/crtime_001_pos': ['SKIP', statx_reason],
	'cli_root/zdb/zdb_006_pos': ['FAIL', known_reason],
	'cli_root/zfs_destroy/zfs_destroy_dev_removal_condense':
	['FAIL', known_reason],
	'cli_root/zfs_get/zfs_get_004_pos': ['FAIL', known_reason],
	'cli_root/zfs_get/zfs_get_009_pos': ['SKIP', '5479'],
	'cli_root/zfs_rollback/zfs_rollback_001_pos': ['FAIL', known_reason],
	'cli_root/zfs_rollback/zfs_rollback_002_pos': ['FAIL', known_reason],
	'cli_root/zfs_share/setup': ['SKIP', share_reason],
	'cli_root/zfs_snapshot/zfs_snapshot_002_neg': ['FAIL', known_reason],
	'cli_root/zfs_unshare/setup': ['SKIP', share_reason],
	'cli_root/zpool_add/zpool_add_004_pos': ['FAIL', known_reason],
	'cli_root/zpool_destroy/zpool_destroy_001_pos': ['SKIP', '6145'],
	'cli_root/zpool_import/import_rewind_device_replaced':
	['FAIL', rewind_reason],
	'cli_root/zpool_import/import_rewind_config_changed':
	['FAIL', rewind_reason],
	'cli_root/zpool_import/zpool_import_missing_003_pos': ['SKIP', '6839'],
	'cli_root/zpool_initialize/zpool_initialize_import_export':
	['FAIL', '11948'],
	'cli_root/zpool_labelclear/zpool_labelclear_removed':
	['FAIL', known_reason],
	'cli_root/zpool_trim/setup': ['SKIP', trim_reason],
	'cli_root/zpool_upgrade/zpool_upgrade_004_pos': ['FAIL', '6141'],
	'delegate/setup': ['SKIP', exec_reason],
	'history/history_004_pos': ['FAIL', '7026'],
	'history/history_005_neg': ['FAIL', '6680'],
	'history/history_006_neg': ['FAIL', '5657'],
	'history/history_008_pos': ['FAIL', known_reason],
	'history/history_010_pos': ['SKIP', exec_reason],
	'io/mmap': ['SKIP', fio_reason],
	- 'l2arc/persist_l2arc_005_pos': ['FAIL', known_reason],
	- 'l2arc/persist_l2arc_007_pos': ['FAIL', '11887'],
	'largest_pool/largest_pool_001_pos': ['FAIL', known_reason],
	'mmp/mmp_on_uberblocks': ['FAIL', known_reason],
	'pyzfs/pyzfs_unittest': ['SKIP', python_deps_reason],
	'no_space/enospc_002_pos': ['FAIL', enospc_reason],
	'pool_checkpoint/checkpoint_discard_busy': ['FAIL', '11946'],
	'projectquota/setup': ['SKIP', exec_reason],
	'redundancy/redundancy_004_neg': ['FAIL', '7290'],
	'redundancy/redundancy_draid_spare3': ['SKIP', known_reason],
	'removal/removal_condense_export': ['FAIL', known_reason],
	'reservation/reservation_008_pos': ['FAIL', '7741'],
	'reservation/reservation_018_pos': ['FAIL', '5642'],
	'rsend/rsend_019_pos': ['FAIL', '6086'],
	'rsend/rsend_020_pos': ['FAIL', '6446'],
	'rsend/rsend_021_pos': ['FAIL', '6446'],
	'rsend/rsend_024_pos': ['FAIL', '5665'],
	'rsend/send-c_volume': ['FAIL', '6087'],
	'rsend/send_partial_dataset': ['FAIL', known_reason],
	'snapshot/clone_001_pos': ['FAIL', known_reason],
	'snapshot/snapshot_009_pos': ['FAIL', '7961'],
	'snapshot/snapshot_010_pos': ['FAIL', '7961'],
	'snapused/snapused_004_pos': ['FAIL', '5513'],
	'tmpfile/setup': ['SKIP', tmpfile_reason],
	'threadsappend/threadsappend_001_pos': ['FAIL', '6136'],
	'trim/setup': ['SKIP', trim_reason],
	'upgrade/upgrade_projectquota_001_pos': ['SKIP', project_id_reason],
	'user_namespace/setup': ['SKIP', user_ns_reason],
	'userquota/setup': ['SKIP', exec_reason],
	'vdev_zaps/vdev_zaps_004_pos': ['FAIL', '6935'],
	'zvol/zvol_ENOSPC/zvol_ENOSPC_001_pos': ['FAIL', '5848'],
	'pam/setup': ['SKIP', "pamtester might be not available"],
	}

	if sys.platform.startswith('freebsd'):
	maybe.update({
	'cli_root/zfs_copies/zfs_copies_002_pos': ['FAIL', known_reason],
	'cli_root/zfs_inherit/zfs_inherit_001_neg': ['FAIL', known_reason],
	'cli_root/zfs_receive/receive-o-x_props_override':
	['FAIL', known_reason],
	'cli_root/zfs_share/zfs_share_011_pos': ['FAIL', known_reason],
	'cli_root/zfs_share/zfs_share_concurrent_shares':
	['FAIL', known_reason],
	'cli_root/zpool_import/zpool_import_012_pos': ['FAIL', known_reason],
	- 'cli_root/zpool_import/zpool_import_features_001_pos':
	- ['FAIL', '11854'],
	- 'cli_root/zpool_import/zpool_import_features_002_neg':
	- ['FAIL', '11854'],
	- 'cli_root/zpool_import/zpool_import_features_003_pos':
	- ['FAIL', '11854'],
	'delegate/zfs_allow_003_pos': ['FAIL', known_reason],
	'inheritance/inherit_001_pos': ['FAIL', '11829'],
	- 'pool_checkpoint/checkpoint_zhack_feat': ['FAIL', '11854'],
	'resilver/resilver_restart_001': ['FAIL', known_reason],
	'zvol/zvol_misc/zvol_misc_volmode': ['FAIL', known_reason],
	})
	elif sys.platform.startswith('linux'):
	maybe.update({
	'alloc_class/alloc_class_009_pos': ['FAIL', known_reason],
	'alloc_class/alloc_class_010_pos': ['FAIL', known_reason],
	'alloc_class/alloc_class_011_neg': ['FAIL', known_reason],
	'alloc_class/alloc_class_012_pos': ['FAIL', known_reason],
	'alloc_class/alloc_class_013_pos': ['FAIL', '11888'],
	'cli_root/zfs_rename/zfs_rename_002_pos': ['FAIL', known_reason],
	'cli_root/zpool_expand/zpool_expand_001_pos': ['FAIL', known_reason],
	'cli_root/zpool_expand/zpool_expand_005_pos': ['FAIL', known_reason],
	'cli_root/zpool_reopen/zpool_reopen_003_pos': ['FAIL', known_reason],
	'fault/auto_spare_shared': ['FAIL', '11889'],
	'io/io_uring': ['SKIP', 'io_uring support required'],
	'limits/filesystem_limit': ['SKIP', known_reason],
	'limits/snapshot_limit': ['SKIP', known_reason],
	'mmp/mmp_active_import': ['FAIL', known_reason],
	'mmp/mmp_exported_import': ['FAIL', known_reason],
	'mmp/mmp_inactive_import': ['FAIL', known_reason],
	'refreserv/refreserv_raidz': ['FAIL', known_reason],
	'rsend/rsend_007_pos': ['FAIL', known_reason],
	'rsend/rsend_010_pos': ['FAIL', known_reason],
	'rsend/rsend_011_pos': ['FAIL', known_reason],
	'snapshot/rollback_003_pos': ['FAIL', known_reason],
	})


	# Not all Github actions runners have scsi_debug module, so we may skip
	# some tests which use it.
	if os.environ.get('CI') == 'true':
	known.update({
	'cli_root/zpool_expand/zpool_expand_001_pos': ['SKIP', ci_reason],
	'cli_root/zpool_expand/zpool_expand_003_neg': ['SKIP', ci_reason],
	'cli_root/zpool_expand/zpool_expand_005_pos': ['SKIP', ci_reason],
	'cli_root/zpool_reopen/setup': ['SKIP', ci_reason],
	'cli_root/zpool_reopen/zpool_reopen_001_pos': ['SKIP', ci_reason],
	'cli_root/zpool_reopen/zpool_reopen_002_pos': ['SKIP', ci_reason],
	'cli_root/zpool_reopen/zpool_reopen_003_pos': ['SKIP', ci_reason],
	'cli_root/zpool_reopen/zpool_reopen_004_pos': ['SKIP', ci_reason],
	'cli_root/zpool_reopen/zpool_reopen_005_pos': ['SKIP', ci_reason],
	'cli_root/zpool_reopen/zpool_reopen_006_neg': ['SKIP', ci_reason],
	'cli_root/zpool_reopen/zpool_reopen_007_pos': ['SKIP', ci_reason],
	'cli_root/zpool_split/zpool_split_wholedisk': ['SKIP', ci_reason],
	'fault/auto_offline_001_pos': ['SKIP', ci_reason],
	'fault/auto_online_001_pos': ['SKIP', ci_reason],
	+ 'fault/auto_online_002_pos': ['SKIP', ci_reason],
	'fault/auto_replace_001_pos': ['SKIP', ci_reason],
	'fault/auto_spare_ashift': ['SKIP', ci_reason],
	'fault/auto_spare_shared': ['SKIP', ci_reason],
	'procfs/pool_state': ['SKIP', ci_reason],
	})

	maybe.update({
	'events/events_002_pos': ['FAIL', '11546'],
	})


	def usage(s):
	print(s)
	sys.exit(1)


	def process_results(pathname):
	try:
	f = open(pathname)
	except IOError as e:
	print('Error opening file: %s' % e)
	sys.exit(1)

	prefix = '/zfs-tests/tests/functional/'
	pattern = \
	r'^Test(?:\s+$\S+$)?:' + \
	r'\s\S%s(\S+)\s$run as (\S+)$\s\[(\S+)\]\s*\[(\S+)\]' \
	% prefix
	pattern_log = r'^\sLog directory:\s(\S*)'

	d = {}
	for line in f.readlines():
	m = re.match(pattern, line)
	if m and len(m.groups()) == 4:
	summary['total'] += 1
	if m.group(4) == "PASS":
	summary['passed'] += 1
	d[m.group(1)] = m.group(4)
	continue

	m = re.match(pattern_log, line)
	if m:
	summary['logfile'] = m.group(1)

	return d


	if __name__ == "__main__":
	if len(sys.argv) != 2:
	usage('usage: %s <pathname>' % sys.argv[0])
	results = process_results(sys.argv[1])

	if summary['total'] == 0:
	print("\n\nNo test results were found.")
	print("Log directory: %s" % summary['logfile'])
	sys.exit(0)

	expected = []
	unexpected = []

	for test in list(results.keys()):
	if results[test] == "PASS":
	continue

	setup = test.replace(os.path.basename(test), "setup")
	if results[test] == "SKIP" and test != setup:
	if setup in known and known[setup][0] == "SKIP":
	continue
	if setup in maybe and maybe[setup][0] == "SKIP":
	continue

	if ((test not in known or results[test] not in known[test][0]) and
	(test not in maybe or results[test] not in maybe[test][0])):
	unexpected.append(test)
	else:
	expected.append(test)

	print("\nTests with results other than PASS that are expected:")
	for test in sorted(expected):
	issue_url = 'https://github.com/openzfs/zfs/issues/'

	# Include the reason why the result is expected, given the following:
	# 1. Suppress test results which set the "Not applicable" reason.
	# 2. Numerical reasons are assumed to be GitHub issue numbers.
	# 3. When an entire test group is skipped only report the setup reason.
	if test in known:
	if known[test][1] == na_reason:
	continue
	elif known[test][1].isdigit():
	expect = issue_url + known[test][1]
	else:
	expect = known[test][1]
	elif test in maybe:
	if maybe[test][1].isdigit():
	expect = issue_url + maybe[test][1]
	else:
	expect = maybe[test][1]
	elif setup in known and known[setup][0] == "SKIP" and setup != test:
	continue
	elif setup in maybe and maybe[setup][0] == "SKIP" and setup != test:
	continue
	else:
	expect = "UNKNOWN REASON"
	print(" %s %s (%s)" % (results[test], test, expect))

	print("\nTests with result of PASS that are unexpected:")
	for test in sorted(known.keys()):
	# We probably should not be silently ignoring the case
	# where "test" is not in "results".
	if test not in results or results[test] != "PASS":
	continue
	print(" %s %s (expected %s)" % (results[test], test,
	known[test][0]))

	print("\nTests with results other than PASS that are unexpected:")
	for test in sorted(unexpected):
	expect = "PASS" if test not in known else known[test][0]
	print(" %s %s (expected %s)" % (results[test], test, expect))

	if len(unexpected) == 0:
	sys.exit(0)
	else:
	sys.exit(1)
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/include/blkdev.shlib b/sys/contrib/openzfs/tests/zfs-tests/include/blkdev.shlib
	index 3f29d4f594a1..bcba8ee759c9 100644
	--- a/sys/contrib/openzfs/tests/zfs-tests/include/blkdev.shlib
	+++ b/sys/contrib/openzfs/tests/zfs-tests/include/blkdev.shlib
	@@ -1,654 +1,654 @@
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	# Copyright 2009 Sun Microsystems, Inc. All rights reserved.
	# Use is subject to license terms.
	# Copyright (c) 2012, 2019 by Delphix. All rights reserved.
	# Copyright 2016 Nexenta Systems, Inc.
	# Copyright (c) 2016, 2017 by Intel Corporation. All rights reserved.
	# Copyright (c) 2017 Lawrence Livermore National Security, LLC.
	# Copyright (c) 2017 Datto Inc.
	# Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
	# Copyright 2019 Richard Elling
	#

	#
	# Returns SCSI host number for the given disk
	#
	function get_scsi_host #disk
	{
	typeset disk=$1
	ls /sys/block/${disk}/device/scsi_device \| cut -d : -f 1
	}

	#
	# Cause a scan of all scsi host adapters by default
	#
	# $1 optional host number
	#
	function scan_scsi_hosts
	{
	typeset hostnum=${1}

	if is_linux; then
	if [[ -z $hostnum ]]; then
	for host in /sys/class/scsi_host/host*; do
	log_must eval "echo '- - -' > $host/scan"
	done
	else
	log_must eval \
	"echo /sys/class/scsi_host/host$hostnum/scan" \
	> /dev/null
	log_must eval \
	"echo '- - -' > /sys/class/scsi_host/host$hostnum/scan"
	fi
	fi
	}

	#
	# Wait for newly created block devices to have their minors created.
	# Additional arguments can be passed to udevadm trigger, with the expected
	# arguments to typically be a block device pathname. This is useful when
	# checking waiting on a specific device to settle rather than triggering
	# all devices and waiting for them all to settle.
	#
	# The udevadm settle timeout can be 120 or 180 seconds by default for
	# some distros. If a long delay is experienced, it could be due to some
	# strangeness in a malfunctioning device that isn't related to the devices
	# under test. To help debug this condition, a notice is given if settle takes
	# too long.
	#
	# Note: there is no meaningful return code if udevadm fails. Consumers
	# should not expect a return code (do not call as argument to log_must)
	#
	function block_device_wait
	{
	if is_linux; then
	udevadm trigger $*
	typeset start=$SECONDS
	udevadm settle
	typeset elapsed=$((SECONDS - start))
	[[ $elapsed > 60 ]] && \
	log_note udevadm settle time too long: $elapsed
	elif is_freebsd; then
	if [[ ${#@} -eq 0 ]]; then
	# Do something that has to go through the geom event
	# queue to complete.
	sysctl kern.geom.conftxt >/dev/null
	return
	fi
	fi
	# Poll for the given paths to appear, but give up eventually.
	typeset -i i
	for (( i = 0; i < 5; ++i )); do
	typeset missing=false
	typeset dev
	for dev in "${@}"; do
	- if ! [[ -f $dev ]]; then
	+ if ! [[ -e $dev ]]; then
	missing=true
	break
	fi
	done
	if ! $missing; then
	break
	fi
	sleep ${#@}
	done
	}

	#
	# Check if the given device is physical device
	#
	function is_physical_device #device
	{
	typeset device=${1#$DEV_DSKDIR/}
	device=${device#$DEV_RDSKDIR/}

	if is_linux; then
	is_disk_device "$DEV_DSKDIR/$device" && \
	[[ -f /sys/module/loop/parameters/max_part ]]
	return $?
	elif is_freebsd; then
	is_disk_device "$DEV_DSKDIR/$device" && \
	echo $device \| egrep -q \
	-e '^a?da[0-9]+$' \
	-e '^md[0-9]+$' \
	-e '^mfid[0-9]+$' \
	-e '^nda[0-9]+$' \
	-e '^nvd[0-9]+$' \
	-e '^vtbd[0-9]+$'
	return $?
	else
	echo $device \| egrep "^c[0-F]+([td][0-F]+)+$" > /dev/null 2>&1
	return $?
	fi
	}

	#
	# Check if the given device is a real device (ie SCSI device)
	#
	function is_real_device #disk
	{
	typeset disk=$1
	[[ -z $disk ]] && log_fail "No argument for disk given."

	if is_linux; then
	lsblk $DEV_RDSKDIR/$disk -o TYPE 2>/dev/null \| \
	egrep disk >/dev/null
	return $?
	fi
	}

	#
	# Check if the given device is a loop device
	#
	function is_loop_device #disk
	{
	typeset disk=$1
	[[ -z $disk ]] && log_fail "No argument for disk given."

	if is_linux; then
	lsblk $DEV_RDSKDIR/$disk -o TYPE 2>/dev/null \| \
	egrep loop >/dev/null
	return $?
	fi
	}

	#
	# Linux:
	# Check if the given device is a multipath device and if there is a symbolic
	# link to a device mapper and to a disk
	# Currently no support for dm devices alone without multipath
	#
	# FreeBSD:
	# Check if the given device is a gmultipath device.
	#
	# Others:
	# No multipath detection.
	#
	function is_mpath_device #disk
	{
	typeset disk=$1
	[[ -z $disk ]] && log_fail "No argument for disk given."

	if is_linux; then
	lsblk $DEV_MPATHDIR/$disk -o TYPE 2>/dev/null \| \
	egrep mpath >/dev/null
	if (($? == 0)); then
	readlink $DEV_MPATHDIR/$disk > /dev/null 2>&1
	return $?
	else
	return $?
	fi
	elif is_freebsd; then
	is_disk_device $DEV_MPATHDIR/$disk
	else
	false
	fi
	}

	#
	# Check if the given path is the appropriate sort of device special node.
	#
	function is_disk_device #path
	{
	typeset path=$1

	if is_freebsd; then
	# FreeBSD doesn't have block devices, only character devices.
	test -c $path
	else
	test -b $path
	fi
	}

	# Set the slice prefix for disk partitioning depending
	# on whether the device is a real, multipath, or loop device.
	# Currently all disks have to be of the same type, so only
	# checks first disk to determine slice prefix.
	#
	function set_slice_prefix
	{
	typeset disk
	typeset -i i=0

	if is_linux; then
	while (( i < $DISK_ARRAY_NUM )); do
	disk="$(echo $DISKS \| nawk '{print $(i + 1)}')"
	if ( is_mpath_device $disk ) && [[ -z $(echo $disk \| awk 'substr($1,18,1)\
	~ /^[[:digit:]]+$/') ]] \|\| ( is_real_device $disk ); then
	export SLICE_PREFIX=""
	return 0
	elif ( is_mpath_device $disk \|\| is_loop_device \
	$disk ); then
	export SLICE_PREFIX="p"
	return 0
	else
	log_fail "$disk not supported for partitioning."
	fi
	(( i = i + 1))
	done
	fi
	}

	#
	# Set the directory path of the listed devices in $DISK_ARRAY_NUM
	# Currently all disks have to be of the same type, so only
	# checks first disk to determine device directory
	# default = /dev (linux)
	# real disk = /dev (linux)
	# multipath device = /dev/mapper (linux)
	#
	function set_device_dir
	{
	typeset disk
	typeset -i i=0

	if is_linux; then
	while (( i < $DISK_ARRAY_NUM )); do
	disk="$(echo $DISKS \| nawk '{print $(i + 1)}')"
	if is_mpath_device $disk; then
	export DEV_DSKDIR=$DEV_MPATHDIR
	return 0
	else
	export DEV_DSKDIR=$DEV_RDSKDIR
	return 0
	fi
	(( i = i + 1))
	done
	else
	export DEV_DSKDIR=$DEV_RDSKDIR
	fi
	}

	#
	# Get the directory path of given device
	#
	function get_device_dir #device
	{
	typeset device=$1

	if ! is_freebsd && ! is_physical_device $device; then
	if [[ $device != "/" ]]; then
	device=${device%/*}
	fi
	if is_disk_device "$DEV_DSKDIR/$device"; then
	device="$DEV_DSKDIR"
	fi
	echo $device
	else
	echo "$DEV_DSKDIR"
	fi
	}

	#
	# Get persistent name for given disk
	#
	function get_persistent_disk_name #device
	{
	typeset device=$1
	typeset dev_id

	if is_linux; then
	if is_real_device $device; then
	dev_id="$(udevadm info -q all -n $DEV_DSKDIR/$device \
	\| egrep disk/by-id \| nawk '{print $2; exit}' \
	\| nawk -F / '{print $3}')"
	echo $dev_id
	elif is_mpath_device $device; then
	dev_id="$(udevadm info -q all -n $DEV_DSKDIR/$device \
	\| egrep disk/by-id/dm-uuid \
	\| nawk '{print $2; exit}' \
	\| nawk -F / '{print $3}')"
	echo $dev_id
	else
	echo $device
	fi
	else
	echo $device
	fi
	}

	#
	# Online or offline a disk on the system
	#
	# First checks state of disk. Test will fail if disk is not properly onlined
	# or offlined. Online is a full rescan of SCSI disks by echoing to every
	# host entry.
	#
	function on_off_disk # disk state{online,offline} host
	{
	typeset disk=$1
	typeset state=$2
	typeset host=$3

	[[ -z $disk ]] \|\| [[ -z $state ]] && \
	log_fail "Arguments invalid or missing"

	if is_linux; then
	if [[ $state == "offline" ]] && ( is_mpath_device $disk ); then
	dm_name="$(readlink $DEV_DSKDIR/$disk \
	\| nawk -F / '{print $2}')"
	dep="$(ls /sys/block/${dm_name}/slaves \
	\| nawk '{print $1}')"
	while [[ -n $dep ]]; do
	#check if disk is online
	lsscsi \| egrep $dep > /dev/null
	if (($? == 0)); then
	dep_dir="/sys/block/${dm_name}"
	dep_dir+="/slaves/${dep}/device"
	ss="${dep_dir}/state"
	sd="${dep_dir}/delete"
	log_must eval "echo 'offline' > ${ss}"
	log_must eval "echo '1' > ${sd}"
	lsscsi \| egrep $dep > /dev/null
	if (($? == 0)); then
	log_fail "Offlining" \
	"$disk failed"
	fi
	fi
	dep="$(ls /sys/block/$dm_name/slaves \
	2>/dev/null \| nawk '{print $1}')"
	done
	elif [[ $state == "offline" ]] && ( is_real_device $disk ); then
	#check if disk is online
	lsscsi \| egrep $disk > /dev/null
	if (($? == 0)); then
	dev_state="/sys/block/$disk/device/state"
	dev_delete="/sys/block/$disk/device/delete"
	log_must eval "echo 'offline' > ${dev_state}"
	log_must eval "echo '1' > ${dev_delete}"
	lsscsi \| egrep $disk > /dev/null
	if (($? == 0)); then
	log_fail "Offlining $disk" \
	"failed"
	fi
	else
	log_note "$disk is already offline"
	fi
	elif [[ $state == "online" ]]; then
	#force a full rescan
	scan_scsi_hosts $host
	block_device_wait
	if is_mpath_device $disk; then
	dm_name="$(readlink $DEV_DSKDIR/$disk \
	\| nawk -F / '{print $2}')"
	dep="$(ls /sys/block/$dm_name/slaves \
	\| nawk '{print $1}')"
	lsscsi \| egrep $dep > /dev/null
	if (($? != 0)); then
	log_fail "Onlining $disk failed"
	fi
	elif is_real_device $disk; then
	block_device_wait
	typeset -i retries=0
	while ! lsscsi \| egrep -q $disk; do
	if (( $retries > 2 )); then
	log_fail "Onlining $disk failed"
	break
	fi
	(( ++retries ))
	sleep 1
	done
	else
	log_fail "$disk is not a real dev"
	fi
	else
	log_fail "$disk failed to $state"
	fi
	fi
	}

	#
	# Simulate disk removal
	#
	function remove_disk #disk
	{
	typeset disk=$1
	on_off_disk $disk "offline"
	block_device_wait
	}

	#
	# Simulate disk insertion for the given SCSI host
	#
	function insert_disk #disk scsi_host
	{
	typeset disk=$1
	typeset scsi_host=$2
	on_off_disk $disk "online" $scsi_host
	block_device_wait
	}

	#
	# Load scsi_debug module with specified parameters
	# $blksz can be either one of: < 512b \| 512e \| 4Kn >
	#
	function load_scsi_debug # dev_size_mb add_host num_tgts max_luns blksz
	{
	typeset devsize=$1
	typeset hosts=$2
	typeset tgts=$3
	typeset luns=$4
	typeset blksz=$5

	[[ -z $devsize ]] \|\| [[ -z $hosts ]] \|\| [[ -z $tgts ]] \|\| \
	[[ -z $luns ]] \|\| [[ -z $blksz ]] && \
	log_fail "Arguments invalid or missing"

	case "$5" in
	'512b')
	typeset sector=512
	typeset blkexp=0
	;;
	'512e')
	typeset sector=512
	typeset blkexp=3
	;;
	'4Kn')
	typeset sector=4096
	typeset blkexp=0
	;;
	*) log_fail "Unsupported blksz value: $5" ;;
	esac

	if is_linux; then
	modprobe -n scsi_debug
	if (($? != 0)); then
	log_unsupported "Platform does not have scsi_debug"
	"module"
	fi
	lsmod \| egrep scsi_debug > /dev/null
	if (($? == 0)); then
	log_fail "scsi_debug module already installed"
	else
	log_must modprobe scsi_debug dev_size_mb=$devsize \
	add_host=$hosts num_tgts=$tgts max_luns=$luns \
	sector_size=$sector physblk_exp=$blkexp
	block_device_wait
	lsscsi \| egrep scsi_debug > /dev/null
	if (($? == 1)); then
	log_fail "scsi_debug module install failed"
	fi
	fi
	fi
	}

	#
	# Unload scsi_debug module, if needed.
	#
	function unload_scsi_debug
	{
	log_must_retry "in use" 5 modprobe -r scsi_debug
	}

	#
	# Get scsi_debug device name.
	# Returns basename of scsi_debug device (for example "sdb").
	#
	function get_debug_device
	{
	for i in {1..10} ; do
	val=$(lsscsi \| nawk '/scsi_debug/ {print $6; exit}' \| cut -d / -f3)

	# lsscsi can take time to settle
	if [ "$val" != "-" ] ; then
	break
	fi
	sleep 1
	done
	echo "$val"
	}

	#
	# Get actual devices used by the pool (i.e. linux sdb1 not sdb).
	#
	function get_pool_devices #testpool #devdir
	{
	typeset testpool=$1
	typeset devdir=$2
	typeset out=""

	if is_linux \|\| is_freebsd; then
	out=$(zpool status -P $testpool \|grep ${devdir} \| awk '{print $1}')
	out=$(echo $out \| sed -e "s\|${devdir}/\|\|g" \| tr '\n' ' ')
	fi
	echo $out
	}

	#
	# Write to standard out giving the level, device name, offset and length
	# of all blocks in an input file. The offset and length are in units of
	# 512 byte blocks. In the case of mirrored vdevs, only the first
	# device is listed, as the levels, blocks and offsets will be the same
	# on other devices. Note that this function only works with mirrored
	# or non-redundant pools, not raidz.
	#
	# The output of this function can be used to introduce corruption at
	# varying levels of indirection.
	#
	function list_file_blocks # input_file
	{
	typeset input_file=$1

	[[ -f $input_file ]] \|\| log_fail "Couldn't find $input_file"

	typeset ds="$(zfs list -H -o name $input_file)"
	typeset pool="${ds%%/*}"
	typeset objnum="$(get_objnum $input_file)"

	#
	# Establish a mapping between vdev ids as shown in a DVA and the
	# pathnames they correspond to in ${VDEV_MAP[][]}.
	#
	# The vdev bits in a DVA refer to the top level vdev id.
	# ${VDEV_MAP[$id]} is an array of the vdev paths within that vdev.
	#
	eval $(zdb -C $pool \| awk '
	BEGIN { printf "typeset -a VDEV_MAP;" }
	function subscript(s) {
	# "[#]" is more convenient than the bare "#"
	match(s, /\[[0-9]*\]/)
	return substr(s, RSTART, RLENGTH)
	}
	id && !/^ / {
	# left a top level vdev
	id = 0
	}
	id && $1 ~ /^path:$/ {
	# found a vdev path; save it in the map
	printf "VDEV_MAP%s%s=%s;", id, child, $2
	}
	/^ children/ {
	# entering a top level vdev
	id = subscript($0)
	child = "[0]" # default in case there is no nested vdev
	printf "typeset -a VDEV_MAP%s;", id
	}
	/^ children/ {
	# entering a nested vdev (e.g. child of a top level mirror)
	child = subscript($0)
	}
	')

	#
	# The awk below parses the output of zdb, printing out the level
	# of each block along with vdev id, offset and length. The last
	# two are converted to decimal in the while loop. 4M is added to
	# the offset to compensate for the first two labels and boot
	# block. Lastly, the offset and length are printed in units of
	# 512B blocks for ease of use with dd.
	#
	typeset level vdev path offset length
	if awk -n '' 2>/dev/null; then
	# gawk needs -n to decode hex
	AWK='awk -n'
	else
	AWK='awk'
	fi
	log_must zpool sync -f
	zdb -dddddd $ds $objnum \| $AWK -v pad=$((4<<20)) -v bs=512 '
	/^$/ { looking = 0 }
	looking {
	level = $2
	field = 3
	while (split($field, dva, ":") == 3) {
	# top level vdev id
	vdev = int(dva[1])
	# offset + 4M label/boot pad in 512B blocks
	offset = (int("0x"dva[2]) + pad) / bs
	# length in 512B blocks
	len = int("0x"dva[3]) / bs

	print level, vdev, offset, len

	++field
	}
	}
	/^Indirect blocks:/ { looking = 1 }
	' \| \
	while read level vdev offset length; do
	for path in ${VDEV_MAP[$vdev][@]}; do
	echo "$level $path $offset $length"
	done
	done 2>/dev/null
	}

	function corrupt_blocks_at_level # input_file corrupt_level
	{
	typeset input_file=$1
	typeset corrupt_level="L${2:-0}"
	typeset level path offset length

	[[ -f $input_file ]] \|\| log_fail "Couldn't find $input_file"

	if is_freebsd; then
	# Temporarily allow corrupting an inuse device.
	debugflags=$(sysctl -n kern.geom.debugflags)
	sysctl kern.geom.debugflags=16
	fi

	list_file_blocks $input_file \| \
	while read level path offset length; do
	if [[ $level = $corrupt_level ]]; then
	log_must dd if=/dev/urandom of=$path bs=512 \
	count=$length seek=$offset conv=notrunc
	fi
	done

	if is_freebsd; then
	sysctl kern.geom.debugflags=$debugflags
	fi

	# This is necessary for pools made of loop devices.
	sync
	}
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/include/libtest.shlib b/sys/contrib/openzfs/tests/zfs-tests/include/libtest.shlib
	index 08c29c25fac7..9391c050b776 100644
	--- a/sys/contrib/openzfs/tests/zfs-tests/include/libtest.shlib
	+++ b/sys/contrib/openzfs/tests/zfs-tests/include/libtest.shlib
	@@ -1,4250 +1,4278 @@
	#
	# CDDL HEADER START
	#
	# The contents of this file are subject to the terms of the
	# Common Development and Distribution License (the "License").
	# You may not use this file except in compliance with the License.
	#
	# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	# or http://www.opensolaris.org/os/licensing.
	# See the License for the specific language governing permissions
	# and limitations under the License.
	#
	# When distributing Covered Code, include this CDDL HEADER in each
	# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	# If applicable, add the following below this CDDL HEADER, with the
	# fields enclosed by brackets "[]" replaced with your own identifying
	# information: Portions Copyright [yyyy] [name of copyright owner]
	#
	# CDDL HEADER END
	#

	#
	# Copyright (c) 2009, Sun Microsystems Inc. All rights reserved.
	# Copyright (c) 2012, 2020, Delphix. All rights reserved.
	# Copyright (c) 2017, Tim Chase. All rights reserved.
	# Copyright (c) 2017, Nexenta Systems Inc. All rights reserved.
	# Copyright (c) 2017, Lawrence Livermore National Security LLC.
	# Copyright (c) 2017, Datto Inc. All rights reserved.
	# Copyright (c) 2017, Open-E Inc. All rights reserved.
	# Use is subject to license terms.
	#

	. ${STF_TOOLS}/include/logapi.shlib
	. ${STF_SUITE}/include/math.shlib
	. ${STF_SUITE}/include/blkdev.shlib

	. ${STF_SUITE}/include/tunables.cfg

	#
	# Apply constrained path when available. This is required since the
	# PATH may have been modified by sudo's secure_path behavior.
	#
	if [ -n "$STF_PATH" ]; then
	export PATH="$STF_PATH"
	fi

	#
	# Generic dot version comparison function
	#
	# Returns success when version $1 is greater than or equal to $2.
	#
	function compare_version_gte
	{
	if [[ "$(printf "$1\n$2" \| sort -V \| tail -n1)" == "$1" ]]; then
	return 0
	else
	return 1
	fi
	}

	# Linux kernel version comparison function
	#
	# $1 Linux version ("4.10", "2.6.32") or blank for installed Linux version
	#
	# Used for comparison: if [ $(linux_version) -ge $(linux_version "2.6.32") ]
	#
	function linux_version
	{
	typeset ver="$1"

	[[ -z "$ver" ]] && ver=$(uname -r \| grep -Eo "^[0-9]+\.[0-9]+\.[0-9]+")

	typeset version=$(echo $ver \| cut -d '.' -f 1)
	typeset major=$(echo $ver \| cut -d '.' -f 2)
	typeset minor=$(echo $ver \| cut -d '.' -f 3)

	[[ -z "$version" ]] && version=0
	[[ -z "$major" ]] && major=0
	[[ -z "$minor" ]] && minor=0

	echo $((version * 10000 + major * 100 + minor))
	}

	# Determine if this is a Linux test system
	#
	# Return 0 if platform Linux, 1 if otherwise

	function is_linux
	{
	if [[ $(uname -o) == "GNU/Linux" ]]; then
	return 0
	else
	return 1
	fi
	}

	# Determine if this is an illumos test system
	#
	# Return 0 if platform illumos, 1 if otherwise
	function is_illumos
	{
	if [[ $(uname -o) == "illumos" ]]; then
	return 0
	else
	return 1
	fi
	}

	# Determine if this is a FreeBSD test system
	#
	# Return 0 if platform FreeBSD, 1 if otherwise

	function is_freebsd
	{
	if [[ $(uname -o) == "FreeBSD" ]]; then
	return 0
	else
	return 1
	fi
	}

	# Determine if this is a DilOS test system
	#
	# Return 0 if platform DilOS, 1 if otherwise

	function is_dilos
	{
	typeset ID=""
	[[ -f /etc/os-release ]] && . /etc/os-release
	if [[ $ID == "dilos" ]]; then
	return 0
	else
	return 1
	fi
	}

	# Determine if this is a 32-bit system
	#
	# Return 0 if platform is 32-bit, 1 if otherwise

	function is_32bit
	{
	if [[ $(getconf LONG_BIT) == "32" ]]; then
	return 0
	else
	return 1
	fi
	}

	# Determine if kmemleak is enabled
	#
	# Return 0 if kmemleak is enabled, 1 if otherwise

	function is_kmemleak
	{
	if is_linux && [[ -e /sys/kernel/debug/kmemleak ]]; then
	return 0
	else
	return 1
	fi
	}

	# Determine whether a dataset is mounted
	#
	# $1 dataset name
	# $2 filesystem type; optional - defaulted to zfs
	#
	# Return 0 if dataset is mounted; 1 if unmounted; 2 on error

	function ismounted
	{
	typeset fstype=$2
	[[ -z $fstype ]] && fstype=zfs
	typeset out dir name ret

	case $fstype in
	zfs)
	if [[ "$1" == "/"* ]] ; then
	for out in $(zfs mount \| awk '{print $2}'); do
	[[ $1 == $out ]] && return 0
	done
	else
	for out in $(zfs mount \| awk '{print $1}'); do
	[[ $1 == $out ]] && return 0
	done
	fi
	;;
	ufs\|nfs)
	if is_freebsd; then
	mount -pt $fstype \| while read dev dir _t _flags; do
	[[ "$1" == "$dev" \|\| "$1" == "$dir" ]] && return 0
	done
	else
	out=$(df -F $fstype $1 2>/dev/null)
	ret=$?
	(($ret != 0)) && return $ret

	dir=${out%%\(*}
	dir=${dir%% *}
	name=${out##*\(}
	name=${name%%\)*}
	name=${name%% *}

	[[ "$1" == "$dir" \|\| "$1" == "$name" ]] && return 0
	fi
	;;
	ext*)
	out=$(df -t $fstype $1 2>/dev/null)
	return $?
	;;
	zvol)
	if [[ -L "$ZVOL_DEVDIR/$1" ]]; then
	link=$(readlink -f $ZVOL_DEVDIR/$1)
	[[ -n "$link" ]] && \
	mount \| grep -q "^$link" && \
	return 0
	fi
	;;
	esac

	return 1
	}

	# Return 0 if a dataset is mounted; 1 otherwise
	#
	# $1 dataset name
	# $2 filesystem type; optional - defaulted to zfs

	function mounted
	{
	ismounted $1 $2
	(($? == 0)) && return 0
	return 1
	}

	# Return 0 if a dataset is unmounted; 1 otherwise
	#
	# $1 dataset name
	# $2 filesystem type; optional - defaulted to zfs

	function unmounted
	{
	ismounted $1 $2
	(($? == 1)) && return 0
	return 1
	}

	# split line on ","
	#
	# $1 - line to split

	function splitline
	{
	echo $1 \| sed "s/,/ /g"
	}

	function default_setup
	{
	default_setup_noexit "$@"

	log_pass
	}

	function default_setup_no_mountpoint
	{
	default_setup_noexit "$1" "$2" "$3" "yes"

	log_pass
	}

	#
	# Given a list of disks, setup storage pools and datasets.
	#
	function default_setup_noexit
	{
	typeset disklist=$1
	typeset container=$2
	typeset volume=$3
	typeset no_mountpoint=$4
	log_note begin default_setup_noexit

	if is_global_zone; then
	if poolexists $TESTPOOL ; then
	destroy_pool $TESTPOOL
	fi
	[[ -d /$TESTPOOL ]] && rm -rf /$TESTPOOL
	log_must zpool create -f $TESTPOOL $disklist
	else
	reexport_pool
	fi

	rm -rf $TESTDIR \|\| log_unresolved Could not remove $TESTDIR
	mkdir -p $TESTDIR \|\| log_unresolved Could not create $TESTDIR

	log_must zfs create $TESTPOOL/$TESTFS
	if [[ -z $no_mountpoint ]]; then
	log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS
	fi

	if [[ -n $container ]]; then
	rm -rf $TESTDIR1 \|\| \
	log_unresolved Could not remove $TESTDIR1
	mkdir -p $TESTDIR1 \|\| \
	log_unresolved Could not create $TESTDIR1

	log_must zfs create $TESTPOOL/$TESTCTR
	log_must zfs set canmount=off $TESTPOOL/$TESTCTR
	log_must zfs create $TESTPOOL/$TESTCTR/$TESTFS1
	if [[ -z $no_mountpoint ]]; then
	log_must zfs set mountpoint=$TESTDIR1 \
	$TESTPOOL/$TESTCTR/$TESTFS1
	fi
	fi

	if [[ -n $volume ]]; then
	if is_global_zone ; then
	log_must zfs create -V $VOLSIZE $TESTPOOL/$TESTVOL
	block_device_wait
	else
	log_must zfs create $TESTPOOL/$TESTVOL
	fi
	fi
	}

	#
	# Given a list of disks, setup a storage pool, file system and
	# a container.
	#
	function default_container_setup
	{
	typeset disklist=$1

	default_setup "$disklist" "true"
	}

	#
	# Given a list of disks, setup a storage pool,file system
	# and a volume.
	#
	function default_volume_setup
	{
	typeset disklist=$1

	default_setup "$disklist" "" "true"
	}

	#
	# Given a list of disks, setup a storage pool,file system,
	# a container and a volume.
	#
	function default_container_volume_setup
	{
	typeset disklist=$1

	default_setup "$disklist" "true" "true"
	}

	#
	# Create a snapshot on a filesystem or volume. Defaultly create a snapshot on
	# filesystem
	#
	# $1 Existing filesystem or volume name. Default, $TESTPOOL/$TESTFS
	# $2 snapshot name. Default, $TESTSNAP
	#
	function create_snapshot
	{
	typeset fs_vol=${1:-$TESTPOOL/$TESTFS}
	typeset snap=${2:-$TESTSNAP}

	[[ -z $fs_vol ]] && log_fail "Filesystem or volume's name is undefined."
	[[ -z $snap ]] && log_fail "Snapshot's name is undefined."

	if snapexists $fs_vol@$snap; then
	log_fail "$fs_vol@$snap already exists."
	fi
	datasetexists $fs_vol \|\| \
	log_fail "$fs_vol must exist."

	log_must zfs snapshot $fs_vol@$snap
	}

	#
	# Create a clone from a snapshot, default clone name is $TESTCLONE.
	#
	# $1 Existing snapshot, $TESTPOOL/$TESTFS@$TESTSNAP is default.
	# $2 Clone name, $TESTPOOL/$TESTCLONE is default.
	#
	function create_clone # snapshot clone
	{
	typeset snap=${1:-$TESTPOOL/$TESTFS@$TESTSNAP}
	typeset clone=${2:-$TESTPOOL/$TESTCLONE}

	[[ -z $snap ]] && \
	log_fail "Snapshot name is undefined."
	[[ -z $clone ]] && \
	log_fail "Clone name is undefined."

	log_must zfs clone $snap $clone
	}

	#
	# Create a bookmark of the given snapshot. Defaultly create a bookmark on
	# filesystem.
	#
	# $1 Existing filesystem or volume name. Default, $TESTFS
	# $2 Existing snapshot name. Default, $TESTSNAP
	# $3 bookmark name. Default, $TESTBKMARK
	#
	function create_bookmark
	{
	typeset fs_vol=${1:-$TESTFS}
	typeset snap=${2:-$TESTSNAP}
	typeset bkmark=${3:-$TESTBKMARK}

	[[ -z $fs_vol ]] && log_fail "Filesystem or volume's name is undefined."
	[[ -z $snap ]] && log_fail "Snapshot's name is undefined."
	[[ -z $bkmark ]] && log_fail "Bookmark's name is undefined."

	if bkmarkexists $fs_vol#$bkmark; then
	log_fail "$fs_vol#$bkmark already exists."
	fi
	datasetexists $fs_vol \|\| \
	log_fail "$fs_vol must exist."
	snapexists $fs_vol@$snap \|\| \
	log_fail "$fs_vol@$snap must exist."

	log_must zfs bookmark $fs_vol@$snap $fs_vol#$bkmark
	}

	#
	# Create a temporary clone result of an interrupted resumable 'zfs receive'
	# $1 Destination filesystem name. Must not exist, will be created as the result
	# of this function along with its %recv temporary clone
	# $2 Source filesystem name. Must not exist, will be created and destroyed
	#
	function create_recv_clone
	{
	typeset recvfs="$1"
	typeset sendfs="${2:-$TESTPOOL/create_recv_clone}"
	typeset snap="$sendfs@snap1"
	typeset incr="$sendfs@snap2"
	typeset mountpoint="$TESTDIR/create_recv_clone"
	typeset sendfile="$TESTDIR/create_recv_clone.zsnap"

	[[ -z $recvfs ]] && log_fail "Recv filesystem's name is undefined."

	datasetexists $recvfs && log_fail "Recv filesystem must not exist."
	datasetexists $sendfs && log_fail "Send filesystem must not exist."

	log_must zfs create -o mountpoint="$mountpoint" $sendfs
	log_must zfs snapshot $snap
	log_must eval "zfs send $snap \| zfs recv -u $recvfs"
	log_must mkfile 1m "$mountpoint/data"
	log_must zfs snapshot $incr
	log_must eval "zfs send -i $snap $incr \| dd bs=10K count=1 \
	iflag=fullblock > $sendfile"
	log_mustnot eval "zfs recv -su $recvfs < $sendfile"
	destroy_dataset "$sendfs" "-r"
	log_must rm -f "$sendfile"

	if [[ $(get_prop 'inconsistent' "$recvfs/%recv") -ne 1 ]]; then
	log_fail "Error creating temporary $recvfs/%recv clone"
	fi
	}

	function default_mirror_setup
	{
	default_mirror_setup_noexit $1 $2 $3

	log_pass
	}

	#
	# Given a pair of disks, set up a storage pool and dataset for the mirror
	# @parameters: $1 the primary side of the mirror
	# $2 the secondary side of the mirror
	# @uses: ZPOOL ZFS TESTPOOL TESTFS
	function default_mirror_setup_noexit
	{
	readonly func="default_mirror_setup_noexit"
	typeset primary=$1
	typeset secondary=$2

	[[ -z $primary ]] && \
	log_fail "$func: No parameters passed"
	[[ -z $secondary ]] && \
	log_fail "$func: No secondary partition passed"
	[[ -d /$TESTPOOL ]] && rm -rf /$TESTPOOL
	log_must zpool create -f $TESTPOOL mirror $@
	log_must zfs create $TESTPOOL/$TESTFS
	log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS
	}

	#
	# create a number of mirrors.
	# We create a number($1) of 2 way mirrors using the pairs of disks named
	# on the command line. These mirrors are not mounted
	# @parameters: $1 the number of mirrors to create
	# $... the devices to use to create the mirrors on
	# @uses: ZPOOL ZFS TESTPOOL
	function setup_mirrors
	{
	typeset -i nmirrors=$1

	shift
	while ((nmirrors > 0)); do
	log_must test -n "$1" -a -n "$2"
	[[ -d /$TESTPOOL$nmirrors ]] && rm -rf /$TESTPOOL$nmirrors
	log_must zpool create -f $TESTPOOL$nmirrors mirror $1 $2
	shift 2
	((nmirrors = nmirrors - 1))
	done
	}

	#
	# create a number of raidz pools.
	# We create a number($1) of 2 raidz pools using the pairs of disks named
	# on the command line. These pools are not mounted
	# @parameters: $1 the number of pools to create
	# $... the devices to use to create the pools on
	# @uses: ZPOOL ZFS TESTPOOL
	function setup_raidzs
	{
	typeset -i nraidzs=$1

	shift
	while ((nraidzs > 0)); do
	log_must test -n "$1" -a -n "$2"
	[[ -d /$TESTPOOL$nraidzs ]] && rm -rf /$TESTPOOL$nraidzs
	log_must zpool create -f $TESTPOOL$nraidzs raidz $1 $2
	shift 2
	((nraidzs = nraidzs - 1))
	done
	}

	#
	# Destroy the configured testpool mirrors.
	# the mirrors are of the form ${TESTPOOL}{number}
	# @uses: ZPOOL ZFS TESTPOOL
	function destroy_mirrors
	{
	default_cleanup_noexit

	log_pass
	}

	#
	# Given a minimum of two disks, set up a storage pool and dataset for the raid-z
	# $1 the list of disks
	#
	function default_raidz_setup
	{
	typeset disklist="$*"
	disks=(${disklist[*]})

	if [[ ${#disks[*]} -lt 2 ]]; then
	log_fail "A raid-z requires a minimum of two disks."
	fi

	[[ -d /$TESTPOOL ]] && rm -rf /$TESTPOOL
	log_must zpool create -f $TESTPOOL raidz $disklist
	log_must zfs create $TESTPOOL/$TESTFS
	log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS

	log_pass
	}

	#
	# Common function used to cleanup storage pools and datasets.
	#
	# Invoked at the start of the test suite to ensure the system
	# is in a known state, and also at the end of each set of
	# sub-tests to ensure errors from one set of tests doesn't
	# impact the execution of the next set.

	function default_cleanup
	{
	default_cleanup_noexit

	log_pass
	}

	#
	# Utility function used to list all available pool names.
	#
	# NOTE: $KEEP is a variable containing pool names, separated by a newline
	# character, that must be excluded from the returned list.
	#
	function get_all_pools
	{
	zpool list -H -o name \| grep -Fvx "$KEEP" \| grep -v "$NO_POOLS"
	}

	function default_cleanup_noexit
	{
	typeset pool=""
	#
	# Destroying the pool will also destroy any
	# filesystems it contains.
	#
	if is_global_zone; then
	zfs unmount -a > /dev/null 2>&1
	ALL_POOLS=$(get_all_pools)
	# Here, we loop through the pools we're allowed to
	# destroy, only destroying them if it's safe to do
	# so.
	while [ ! -z ${ALL_POOLS} ]
	do
	for pool in ${ALL_POOLS}
	do
	if safe_to_destroy_pool $pool ;
	then
	destroy_pool $pool
	fi
	done
	ALL_POOLS=$(get_all_pools)
	done

	zfs mount -a
	else
	typeset fs=""
	for fs in $(zfs list -H -o name \
	\| grep "^$ZONE_POOL/$ZONE_CTR[01234]/"); do
	destroy_dataset "$fs" "-Rf"
	done

	# Need cleanup here to avoid garbage dir left.
	for fs in $(zfs list -H -o name); do
	[[ $fs == /$ZONE_POOL ]] && continue
	[[ -d $fs ]] && log_must rm -rf $fs/*
	done

	#
	# Reset the $ZONE_POOL/$ZONE_CTR[01234] file systems property to
	# the default value
	#
	for fs in $(zfs list -H -o name); do
	if [[ $fs == $ZONE_POOL/$ZONE_CTR[01234] ]]; then
	log_must zfs set reservation=none $fs
	log_must zfs set recordsize=128K $fs
	log_must zfs set mountpoint=/$fs $fs
	typeset enc=""
	enc=$(get_prop encryption $fs)
	if [[ $? -ne 0 ]] \|\| [[ -z "$enc" ]] \|\| \
	[[ "$enc" == "off" ]]; then
	log_must zfs set checksum=on $fs
	fi
	log_must zfs set compression=off $fs
	log_must zfs set atime=on $fs
	log_must zfs set devices=off $fs
	log_must zfs set exec=on $fs
	log_must zfs set setuid=on $fs
	log_must zfs set readonly=off $fs
	log_must zfs set snapdir=hidden $fs
	log_must zfs set aclmode=groupmask $fs
	log_must zfs set aclinherit=secure $fs
	fi
	done
	fi

	[[ -d $TESTDIR ]] && \
	log_must rm -rf $TESTDIR

	disk1=${DISKS%% *}
	if is_mpath_device $disk1; then
	delete_partitions
	fi

	rm -f $TEST_BASE_DIR/{err,out}
	}


	#
	# Common function used to cleanup storage pools, file systems
	# and containers.
	#
	function default_container_cleanup
	{
	if ! is_global_zone; then
	reexport_pool
	fi

	ismounted $TESTPOOL/$TESTCTR/$TESTFS1
	[[ $? -eq 0 ]] && \
	log_must zfs unmount $TESTPOOL/$TESTCTR/$TESTFS1

	destroy_dataset "$TESTPOOL/$TESTCTR/$TESTFS1" "-R"
	destroy_dataset "$TESTPOOL/$TESTCTR" "-Rf"

	[[ -e $TESTDIR1 ]] && \
	log_must rm -rf $TESTDIR1 > /dev/null 2>&1

	default_cleanup
	}

	#
	# Common function used to cleanup snapshot of file system or volume. Default to
	# delete the file system's snapshot
	#
	# $1 snapshot name
	#
	function destroy_snapshot
	{
	typeset snap=${1:-$TESTPOOL/$TESTFS@$TESTSNAP}

	if ! snapexists $snap; then
	log_fail "'$snap' does not exist."
	fi

	#
	# For the sake of the value which come from 'get_prop' is not equal
	# to the really mountpoint when the snapshot is unmounted. So, firstly
	# check and make sure this snapshot's been mounted in current system.
	#
	typeset mtpt=""
	if ismounted $snap; then
	mtpt=$(get_prop mountpoint $snap)
	(($? != 0)) && \
	log_fail "get_prop mountpoint $snap failed."
	fi

	destroy_dataset "$snap"
	[[ $mtpt != "" && -d $mtpt ]] && \
	log_must rm -rf $mtpt
	}

	#
	# Common function used to cleanup clone.
	#
	# $1 clone name
	#
	function destroy_clone
	{
	typeset clone=${1:-$TESTPOOL/$TESTCLONE}

	if ! datasetexists $clone; then
	log_fail "'$clone' does not existed."
	fi

	# With the same reason in destroy_snapshot
	typeset mtpt=""
	if ismounted $clone; then
	mtpt=$(get_prop mountpoint $clone)
	(($? != 0)) && \
	log_fail "get_prop mountpoint $clone failed."
	fi

	destroy_dataset "$clone"
	[[ $mtpt != "" && -d $mtpt ]] && \
	log_must rm -rf $mtpt
	}

	#
	# Common function used to cleanup bookmark of file system or volume. Default
	# to delete the file system's bookmark.
	#
	# $1 bookmark name
	#
	function destroy_bookmark
	{
	typeset bkmark=${1:-$TESTPOOL/$TESTFS#$TESTBKMARK}

	if ! bkmarkexists $bkmark; then
	log_fail "'$bkmarkp' does not existed."
	fi

	destroy_dataset "$bkmark"
	}

	# Return 0 if a snapshot exists; $? otherwise
	#
	# $1 - snapshot name

	function snapexists
	{
	zfs list -H -t snapshot "$1" > /dev/null 2>&1
	return $?
	}

	#
	# Return 0 if a bookmark exists; $? otherwise
	#
	# $1 - bookmark name
	#
	function bkmarkexists
	{
	zfs list -H -t bookmark "$1" > /dev/null 2>&1
	return $?
	}

	#
	# Return 0 if a hold exists; $? otherwise
	#
	# $1 - hold tag
	# $2 - snapshot name
	#
	function holdexists
	{
	zfs holds "$2" \| awk '{ print $2 }' \| grep "$1" > /dev/null 2>&1
	return $?
	}

	#
	# Set a property to a certain value on a dataset.
	# Sets a property of the dataset to the value as passed in.
	# @param:
	# $1 dataset who's property is being set
	# $2 property to set
	# $3 value to set property to
	# @return:
	# 0 if the property could be set.
	# non-zero otherwise.
	# @use: ZFS
	#
	function dataset_setprop
	{
	typeset fn=dataset_setprop

	if (($# < 3)); then
	log_note "$fn: Insufficient parameters (need 3, had $#)"
	return 1
	fi
	typeset output=
	output=$(zfs set $2=$3 $1 2>&1)
	typeset rv=$?
	if ((rv != 0)); then
	log_note "Setting property on $1 failed."
	log_note "property $2=$3"
	log_note "Return Code: $rv"
	log_note "Output: $output"
	return $rv
	fi
	return 0
	}

	#
	# Assign suite defined dataset properties.
	# This function is used to apply the suite's defined default set of
	# properties to a dataset.
	# @parameters: $1 dataset to use
	# @uses: ZFS COMPRESSION_PROP CHECKSUM_PROP
	# @returns:
	# 0 if the dataset has been altered.
	# 1 if no pool name was passed in.
	# 2 if the dataset could not be found.
	# 3 if the dataset could not have it's properties set.
	#
	function dataset_set_defaultproperties
	{
	typeset dataset="$1"

	[[ -z $dataset ]] && return 1

	typeset confset=
	typeset -i found=0
	for confset in $(zfs list); do
	if [[ $dataset = $confset ]]; then
	found=1
	break
	fi
	done
	[[ $found -eq 0 ]] && return 2
	if [[ -n $COMPRESSION_PROP ]]; then
	dataset_setprop $dataset compression $COMPRESSION_PROP \|\| \
	return 3
	log_note "Compression set to '$COMPRESSION_PROP' on $dataset"
	fi
	if [[ -n $CHECKSUM_PROP ]]; then
	dataset_setprop $dataset checksum $CHECKSUM_PROP \|\| \
	return 3
	log_note "Checksum set to '$CHECKSUM_PROP' on $dataset"
	fi
	return 0
	}

	#
	# Check a numeric assertion
	# @parameter: $@ the assertion to check
	# @output: big loud notice if assertion failed
	# @use: log_fail
	#
	function assert
	{
	(($@)) \|\| log_fail "$@"
	}

	#
	# Function to format partition size of a disk
	# Given a disk cxtxdx reduces all partitions
	# to 0 size
	#
	function zero_partitions #<whole_disk_name>
	{
	typeset diskname=$1
	typeset i

	if is_freebsd; then
	gpart destroy -F $diskname
	elif is_linux; then
	DSK=$DEV_DSKDIR/$diskname
	DSK=$(echo $DSK \| sed -e "s\|//\|/\|g")
	log_must parted $DSK -s -- mklabel gpt
	blockdev --rereadpt $DSK 2>/dev/null
	block_device_wait
	else
	for i in 0 1 3 4 5 6 7
	do
	log_must set_partition $i "" 0mb $diskname
	done
	fi

	return 0
	}

	#
	# Given a slice, size and disk, this function
	# formats the slice to the specified size.
	# Size should be specified with units as per
	# the `format` command requirements eg. 100mb 3gb
	#
	# NOTE: This entire interface is problematic for the Linux parted utility
	# which requires the end of the partition to be specified. It would be
	# best to retire this interface and replace it with something more flexible.
	# At the moment a best effort is made.
	#
	# arguments: <slice_num> <slice_start> <size_plus_units> <whole_disk_name>
	function set_partition
	{
	typeset -i slicenum=$1
	typeset start=$2
	typeset size=$3
	typeset disk=${4#$DEV_DSKDIR/}
	disk=${disk#$DEV_RDSKDIR/}

	case "$(uname)" in
	Linux)
	if [[ -z $size \|\| -z $disk ]]; then
	log_fail "The size or disk name is unspecified."
	fi
	disk=$DEV_DSKDIR/$disk
	typeset size_mb=${size%%[mMgG]}

	size_mb=${size_mb%%[mMgG][bB]}
	if [[ ${size:1:1} == 'g' ]]; then
	((size_mb = size_mb * 1024))
	fi

	# Create GPT partition table when setting slice 0 or
	# when the device doesn't already contain a GPT label.
	parted $disk -s -- print 1 >/dev/null
	typeset ret_val=$?
	if [[ $slicenum -eq 0 \|\| $ret_val -ne 0 ]]; then
	parted $disk -s -- mklabel gpt
	if [[ $? -ne 0 ]]; then
	log_note "Failed to create GPT partition table on $disk"
	return 1
	fi
	fi

	# When no start is given align on the first cylinder.
	if [[ -z "$start" ]]; then
	start=1
	fi

	# Determine the cylinder size for the device and using
	# that calculate the end offset in cylinders.
	typeset -i cly_size_kb=0
	cly_size_kb=$(parted -m $disk -s -- \
	unit cyl print \| head -3 \| tail -1 \| \
	awk -F '[:k.]' '{print $4}')
	((end = (size_mb * 1024 / cly_size_kb) + start))

	parted $disk -s -- \
	mkpart part$slicenum ${start}cyl ${end}cyl
	typeset ret_val=$?
	if [[ $ret_val -ne 0 ]]; then
	log_note "Failed to create partition $slicenum on $disk"
	return 1
	fi

	blockdev --rereadpt $disk 2>/dev/null
	block_device_wait $disk
	;;
	FreeBSD)
	if [[ -z $size \|\| -z $disk ]]; then
	log_fail "The size or disk name is unspecified."
	fi
	disk=$DEV_DSKDIR/$disk

	if [[ $slicenum -eq 0 ]] \|\| ! gpart show $disk >/dev/null 2>&1; then
	gpart destroy -F $disk >/dev/null 2>&1
	gpart create -s GPT $disk
	if [[ $? -ne 0 ]]; then
	log_note "Failed to create GPT partition table on $disk"
	return 1
	fi
	fi

	typeset index=$((slicenum + 1))

	if [[ -n $start ]]; then
	start="-b $start"
	fi
	gpart add -t freebsd-zfs $start -s $size -i $index $disk
	if [[ $ret_val -ne 0 ]]; then
	log_note "Failed to create partition $slicenum on $disk"
	return 1
	fi

	block_device_wait $disk
	;;
	*)
	if [[ -z $slicenum \|\| -z $size \|\| -z $disk ]]; then
	log_fail "The slice, size or disk name is unspecified."
	fi

	typeset format_file=/var/tmp/format_in.$$

	echo "partition" >$format_file
	echo "$slicenum" >> $format_file
	echo "" >> $format_file
	echo "" >> $format_file
	echo "$start" >> $format_file
	echo "$size" >> $format_file
	echo "label" >> $format_file
	echo "" >> $format_file
	echo "q" >> $format_file
	echo "q" >> $format_file

	format -e -s -d $disk -f $format_file
	typeset ret_val=$?
	rm -f $format_file
	;;
	esac

	if [[ $ret_val -ne 0 ]]; then
	log_note "Unable to format $disk slice $slicenum to $size"
	return 1
	fi
	return 0
	}

	#
	# Delete all partitions on all disks - this is specifically for the use of multipath
	# devices which currently can only be used in the test suite as raw/un-partitioned
	# devices (ie a zpool cannot be created on a whole mpath device that has partitions)
	#
	function delete_partitions
	{
	typeset disk

	if [[ -z $DISKSARRAY ]]; then
	DISKSARRAY=$DISKS
	fi

	if is_linux; then
	typeset -i part
	for disk in $DISKSARRAY; do
	for (( part = 1; part < MAX_PARTITIONS; part++ )); do
	typeset partition=${disk}${SLICE_PREFIX}${part}
	parted $DEV_DSKDIR/$disk -s rm $part > /dev/null 2>&1
	if lsblk \| grep -qF ${partition}; then
	log_fail "Partition ${partition} not deleted"
	else
	log_note "Partition ${partition} deleted"
	fi
	done
	done
	elif is_freebsd; then
	for disk in $DISKSARRAY; do
	if gpart destroy -F $disk; then
	log_note "Partitions for ${disk} deleted"
	else
	log_fail "Partitions for ${disk} not deleted"
	fi
	done
	fi
	}

	#
	# Get the end cyl of the given slice
	#
	function get_endslice #<disk> <slice>
	{
	typeset disk=$1
	typeset slice=$2
	if [[ -z $disk \|\| -z $slice ]] ; then
	log_fail "The disk name or slice number is unspecified."
	fi

	case "$(uname)" in
	Linux)
	endcyl=$(parted -s $DEV_DSKDIR/$disk -- unit cyl print \| \
	grep "part${slice}" \| \
	awk '{print $3}' \| \
	sed 's,cyl,,')
	((endcyl = (endcyl + 1)))
	;;
	FreeBSD)
	disk=${disk#/dev/zvol/}
	disk=${disk%p*}
	slice=$((slice + 1))
	endcyl=$(gpart show $disk \| \
	awk -v slice=$slice '$3 == slice { print $1 + $2 }')
	;;
	*)
	disk=${disk#/dev/dsk/}
	disk=${disk#/dev/rdsk/}
	disk=${disk%s*}

	typeset -i ratio=0
	ratio=$(prtvtoc /dev/rdsk/${disk}s2 \| \
	grep "sectors\/cylinder" \| \
	awk '{print $2}')

	if ((ratio == 0)); then
	return
	fi

	typeset -i endcyl=$(prtvtoc -h /dev/rdsk/${disk}s2 \|
	nawk -v token="$slice" '{if ($1==token) print $6}')

	((endcyl = (endcyl + 1) / ratio))
	;;
	esac

	echo $endcyl
	}


	#
	# Given a size,disk and total slice number, this function formats the
	# disk slices from 0 to the total slice number with the same specified
	# size.
	#
	function partition_disk #<slice_size> <whole_disk_name> <total_slices>
	{
	typeset -i i=0
	typeset slice_size=$1
	typeset disk_name=$2
	typeset total_slices=$3
	typeset cyl

	zero_partitions $disk_name
	while ((i < $total_slices)); do
	if ! is_linux; then
	if ((i == 2)); then
	((i = i + 1))
	continue
	fi
	fi
	log_must set_partition $i "$cyl" $slice_size $disk_name
	cyl=$(get_endslice $disk_name $i)
	((i = i+1))
	done
	}

	#
	# This function continues to write to a filenum number of files into dirnum
	# number of directories until either file_write returns an error or the
	# maximum number of files per directory have been written.
	#
	# Usage:
	# fill_fs [destdir] [dirnum] [filenum] [bytes] [num_writes] [data]
	#
	# Return value: 0 on success
	# non 0 on error
	#
	# Where :
	# destdir: is the directory where everything is to be created under
	# dirnum: the maximum number of subdirectories to use, -1 no limit
	# filenum: the maximum number of files per subdirectory
	# bytes: number of bytes to write
	# num_writes: number of types to write out bytes
	# data: the data that will be written
	#
	# E.g.
	# fill_fs /testdir 20 25 1024 256 0
	#
	# Note: bytes * num_writes equals the size of the testfile
	#
	function fill_fs # destdir dirnum filenum bytes num_writes data
	{
	typeset destdir=${1:-$TESTDIR}
	typeset -i dirnum=${2:-50}
	typeset -i filenum=${3:-50}
	typeset -i bytes=${4:-8192}
	typeset -i num_writes=${5:-10240}
	typeset data=${6:-0}

	mkdir -p $destdir/{1..$dirnum}
	for f in $destdir/{1..$dirnum}/$TESTFILE{1..$filenum}; do
	file_write -o create -f $f -b $bytes -c $num_writes -d $data \
	\|\| return $?
	done
	return 0
	}

	#
	# Simple function to get the specified property. If unable to
	# get the property then exits.
	#
	# Note property is in 'parsable' format (-p)
	#
	function get_prop # property dataset
	{
	typeset prop_val
	typeset prop=$1
	typeset dataset=$2

	prop_val=$(zfs get -pH -o value $prop $dataset 2>/dev/null)
	if [[ $? -ne 0 ]]; then
	log_note "Unable to get $prop property for dataset " \
	"$dataset"
	return 1
	fi

	echo "$prop_val"
	return 0
	}

	#
	# Simple function to get the specified property of pool. If unable to
	# get the property then exits.
	#
	# Note property is in 'parsable' format (-p)
	#
	function get_pool_prop # property pool
	{
	typeset prop_val
	typeset prop=$1
	typeset pool=$2

	if poolexists $pool ; then
	prop_val=$(zpool get -pH $prop $pool 2>/dev/null \| tail -1 \| \
	awk '{print $3}')
	if [[ $? -ne 0 ]]; then
	log_note "Unable to get $prop property for pool " \
	"$pool"
	return 1
	fi
	else
	log_note "Pool $pool not exists."
	return 1
	fi

	echo "$prop_val"
	return 0
	}

	# Return 0 if a pool exists; $? otherwise
	#
	# $1 - pool name

	function poolexists
	{
	typeset pool=$1

	if [[ -z $pool ]]; then
	log_note "No pool name given."
	return 1
	fi

	zpool get name "$pool" > /dev/null 2>&1
	return $?
	}

	# Return 0 if all the specified datasets exist; $? otherwise
	#
	# $1-n dataset name
	function datasetexists
	{
	if (($# == 0)); then
	log_note "No dataset name given."
	return 1
	fi

	while (($# > 0)); do
	zfs get name $1 > /dev/null 2>&1 \|\| \
	return $?
	shift
	done

	return 0
	}

	# return 0 if none of the specified datasets exists, otherwise return 1.
	#
	# $1-n dataset name
	function datasetnonexists
	{
	if (($# == 0)); then
	log_note "No dataset name given."
	return 1
	fi

	while (($# > 0)); do
	zfs list -H -t filesystem,snapshot,volume $1 > /dev/null 2>&1 \
	&& return 1
	shift
	done

	return 0
	}

	function is_shared_freebsd
	{
	typeset fs=$1

	pgrep -q mountd && showmount -E \| grep -qx $fs
	}

	function is_shared_illumos
	{
	typeset fs=$1
	typeset mtpt

	for mtpt in `share \| awk '{print $2}'` ; do
	if [[ $mtpt == $fs ]] ; then
	return 0
	fi
	done

	typeset stat=$(svcs -H -o STA nfs/server:default)
	if [[ $stat != "ON" ]]; then
	log_note "Current nfs/server status: $stat"
	fi

	return 1
	}

	function is_shared_linux
	{
	typeset fs=$1
	typeset mtpt

	for mtpt in `share \| awk '{print $1}'` ; do
	if [[ $mtpt == $fs ]] ; then
	return 0
	fi
	done
	return 1
	}

	#
	# Given a mountpoint, or a dataset name, determine if it is shared via NFS.
	#
	# Returns 0 if shared, 1 otherwise.
	#
	function is_shared
	{
	typeset fs=$1
	typeset mtpt

	if [[ $fs != "/"* ]] ; then
	if datasetnonexists "$fs" ; then
	return 1
	else
	mtpt=$(get_prop mountpoint "$fs")
	case $mtpt in
	none\|legacy\|-) return 1
	;;
	*) fs=$mtpt
	;;
	esac
	fi
	fi

	case $(uname) in
	FreeBSD) is_shared_freebsd "$fs" ;;
	Linux) is_shared_linux "$fs" ;;
	*) is_shared_illumos "$fs" ;;
	esac
	}

	function is_exported_illumos
	{
	typeset fs=$1
	typeset mtpt

	for mtpt in `awk '{print $1}' /etc/dfs/sharetab` ; do
	if [[ $mtpt == $fs ]] ; then
	return 0
	fi
	done

	return 1
	}

	function is_exported_freebsd
	{
	typeset fs=$1
	typeset mtpt

	for mtpt in `awk '{print $1}' /etc/zfs/exports` ; do
	if [[ $mtpt == $fs ]] ; then
	return 0
	fi
	done

	return 1
	}

	function is_exported_linux
	{
	typeset fs=$1
	typeset mtpt

	for mtpt in `awk '{print $1}' /etc/exports.d/zfs.exports` ; do
	if [[ $mtpt == $fs ]] ; then
	return 0
	fi
	done

	return 1
	}

	#
	# Given a mountpoint, or a dataset name, determine if it is exported via
	# the os-specific NFS exports file.
	#
	# Returns 0 if exported, 1 otherwise.
	#
	function is_exported
	{
	typeset fs=$1
	typeset mtpt

	if [[ $fs != "/"* ]] ; then
	if datasetnonexists "$fs" ; then
	return 1
	else
	mtpt=$(get_prop mountpoint "$fs")
	case $mtpt in
	none\|legacy\|-) return 1
	;;
	*) fs=$mtpt
	;;
	esac
	fi
	fi

	case $(uname) in
	FreeBSD) is_exported_freebsd "$fs" ;;
	Linux) is_exported_linux "$fs" ;;
	*) is_exported_illumos "$fs" ;;
	esac
	}

	#
	# Given a dataset name determine if it is shared via SMB.
	#
	# Returns 0 if shared, 1 otherwise.
	#
	function is_shared_smb
	{
	typeset fs=$1
	typeset mtpt

	if datasetnonexists "$fs" ; then
	return 1
	else
	fs=$(echo $fs \| sed 's@/@_@g')
	fi

	if is_linux; then
	for mtpt in `net usershare list \| awk '{print $1}'` ; do
	if [[ $mtpt == $fs ]] ; then
	return 0
	fi
	done
	return 1
	else
	log_note "Currently unsupported by the test framework"
	return 1
	fi
	}

	#
	# Given a mountpoint, determine if it is not shared via NFS.
	#
	# Returns 0 if not shared, 1 otherwise.
	#
	function not_shared
	{
	typeset fs=$1

	is_shared $fs
	if (($? == 0)); then
	return 1
	fi

	return 0
	}

	#
	# Given a dataset determine if it is not shared via SMB.
	#
	# Returns 0 if not shared, 1 otherwise.
	#
	function not_shared_smb
	{
	typeset fs=$1

	is_shared_smb $fs
	if (($? == 0)); then
	return 1
	fi

	return 0
	}

	#
	# Helper function to unshare a mountpoint.
	#
	function unshare_fs #fs
	{
	typeset fs=$1

	is_shared $fs \|\| is_shared_smb $fs
	if (($? == 0)); then
	zfs unshare $fs \|\| log_fail "zfs unshare $fs failed"
	fi

	return 0
	}

	#
	# Helper function to share a NFS mountpoint.
	#
	function share_nfs #fs
	{
	typeset fs=$1

	if is_linux; then
	is_shared $fs
	if (($? != 0)); then
	log_must share "*:$fs"
	fi
	else
	is_shared $fs
	if (($? != 0)); then
	log_must share -F nfs $fs
	fi
	fi

	return 0
	}

	#
	# Helper function to unshare a NFS mountpoint.
	#
	function unshare_nfs #fs
	{
	typeset fs=$1

	if is_linux; then
	is_shared $fs
	if (($? == 0)); then
	log_must unshare -u "*:$fs"
	fi
	else
	is_shared $fs
	if (($? == 0)); then
	log_must unshare -F nfs $fs
	fi
	fi

	return 0
	}

	#
	# Helper function to show NFS shares.
	#
	function showshares_nfs
	{
	if is_linux; then
	share -v
	else
	share -F nfs
	fi

	return 0
	}

	#
	# Helper function to show SMB shares.
	#
	function showshares_smb
	{
	if is_linux; then
	net usershare list
	else
	share -F smb
	fi

	return 0
	}

	function check_nfs
	{
	if is_linux; then
	share -s
	elif is_freebsd; then
	showmount -e
	else
	log_unsupported "Unknown platform"
	fi

	if [[ $? -ne 0 ]]; then
	log_unsupported "The NFS utilities are not installed"
	fi
	}

	#
	# Check NFS server status and trigger it online.
	#
	function setup_nfs_server
	{
	# Cannot share directory in non-global zone.
	#
	if ! is_global_zone; then
	log_note "Cannot trigger NFS server by sharing in LZ."
	return
	fi

	if is_linux; then
	#
	# Re-synchronize /var/lib/nfs/etab with /etc/exports and
	# /etc/exports.d./* to provide a clean test environment.
	#
	log_must share -r

	log_note "NFS server must be started prior to running ZTS."
	return
	elif is_freebsd; then
	kill -s HUP $(cat /var/run/mountd.pid)

	log_note "NFS server must be started prior to running ZTS."
	return
	fi

	typeset nfs_fmri="svc:/network/nfs/server:default"
	if [[ $(svcs -Ho STA $nfs_fmri) != "ON" ]]; then
	#
	# Only really sharing operation can enable NFS server
	# to online permanently.
	#
	typeset dummy=/tmp/dummy

	if [[ -d $dummy ]]; then
	log_must rm -rf $dummy
	fi

	log_must mkdir $dummy
	log_must share $dummy

	#
	# Waiting for fmri's status to be the final status.
	# Otherwise, in transition, an asterisk (*) is appended for
	# instances, unshare will reverse status to 'DIS' again.
	#
	# Waiting for 1's at least.
	#
	log_must sleep 1
	timeout=10
	while [[ timeout -ne 0 && $(svcs -Ho STA $nfs_fmri) == '' ]]
	do
	log_must sleep 1

	((timeout -= 1))
	done

	log_must unshare $dummy
	log_must rm -rf $dummy
	fi

	log_note "Current NFS status: '$(svcs -Ho STA,FMRI $nfs_fmri)'"
	}

	#
	# To verify whether calling process is in global zone
	#
	# Return 0 if in global zone, 1 in non-global zone
	#
	function is_global_zone
	{
	if is_linux \|\| is_freebsd; then
	return 0
	else
	typeset cur_zone=$(zonename 2>/dev/null)
	if [[ $cur_zone != "global" ]]; then
	return 1
	fi
	return 0
	fi
	}

	#
	# Verify whether test is permitted to run from
	# global zone, local zone, or both
	#
	# $1 zone limit, could be "global", "local", or "both"(no limit)
	#
	# Return 0 if permitted, otherwise exit with log_unsupported
	#
	function verify_runnable # zone limit
	{
	typeset limit=$1

	[[ -z $limit ]] && return 0

	if is_global_zone ; then
	case $limit in
	global\|both)
	;;
	local) log_unsupported "Test is unable to run from "\
	"global zone."
	;;
	*) log_note "Warning: unknown limit $limit - " \
	"use both."
	;;
	esac
	else
	case $limit in
	local\|both)
	;;
	global) log_unsupported "Test is unable to run from "\
	"local zone."
	;;
	*) log_note "Warning: unknown limit $limit - " \
	"use both."
	;;
	esac

	reexport_pool
	fi

	return 0
	}

	# Return 0 if create successfully or the pool exists; $? otherwise
	# Note: In local zones, this function should return 0 silently.
	#
	# $1 - pool name
	# $2-n - [keyword] devs_list

	function create_pool #pool devs_list
	{
	typeset pool=${1%%/*}

	shift

	if [[ -z $pool ]]; then
	log_note "Missing pool name."
	return 1
	fi

	if poolexists $pool ; then
	destroy_pool $pool
	fi

	if is_global_zone ; then
	[[ -d /$pool ]] && rm -rf /$pool
	log_must zpool create -f $pool $@
	fi

	return 0
	}

	# Return 0 if destroy successfully or the pool exists; $? otherwise
	# Note: In local zones, this function should return 0 silently.
	#
	# $1 - pool name
	# Destroy pool with the given parameters.

	function destroy_pool #pool
	{
	typeset pool=${1%%/*}
	typeset mtpt

	if [[ -z $pool ]]; then
	log_note "No pool name given."
	return 1
	fi

	if is_global_zone ; then
	if poolexists "$pool" ; then
	mtpt=$(get_prop mountpoint "$pool")

	# At times, syseventd/udev activity can cause attempts
	# to destroy a pool to fail with EBUSY. We retry a few
	# times allowing failures before requiring the destroy
	# to succeed.
	log_must_busy zpool destroy -f $pool

	[[ -d $mtpt ]] && \
	log_must rm -rf $mtpt
	else
	log_note "Pool does not exist. ($pool)"
	return 1
	fi
	fi

	return 0
	}

	# Return 0 if created successfully; $? otherwise
	#
	# $1 - dataset name
	# $2-n - dataset options

	function create_dataset #dataset dataset_options
	{
	typeset dataset=$1

	shift

	if [[ -z $dataset ]]; then
	log_note "Missing dataset name."
	return 1
	fi

	if datasetexists $dataset ; then
	destroy_dataset $dataset
	fi

	log_must zfs create $@ $dataset

	return 0
	}

	# Return 0 if destroy successfully or the dataset exists; $? otherwise
	# Note: In local zones, this function should return 0 silently.
	#
	# $1 - dataset name
	# $2 - custom arguments for zfs destroy
	# Destroy dataset with the given parameters.

	function destroy_dataset #dataset #args
	{
	typeset dataset=$1
	typeset mtpt
	typeset args=${2:-""}

	if [[ -z $dataset ]]; then
	log_note "No dataset name given."
	return 1
	fi

	if is_global_zone ; then
	if datasetexists "$dataset" ; then
	mtpt=$(get_prop mountpoint "$dataset")
	log_must_busy zfs destroy $args $dataset

	[[ -d $mtpt ]] && \
	log_must rm -rf $mtpt
	else
	log_note "Dataset does not exist. ($dataset)"
	return 1
	fi
	fi

	return 0
	}

	#
	# Firstly, create a pool with 5 datasets. Then, create a single zone and
	# export the 5 datasets to it. In addition, we also add a ZFS filesystem
	# and a zvol device to the zone.
	#
	# $1 zone name
	# $2 zone root directory prefix
	# $3 zone ip
	#
	function zfs_zones_setup #zone_name zone_root zone_ip
	{
	typeset zone_name=${1:-$(hostname)-z}
	typeset zone_root=${2:-"/zone_root"}
	typeset zone_ip=${3:-"10.1.1.10"}
	typeset prefix_ctr=$ZONE_CTR
	typeset pool_name=$ZONE_POOL
	typeset -i cntctr=5
	typeset -i i=0

	# Create pool and 5 container within it
	#
	[[ -d /$pool_name ]] && rm -rf /$pool_name
	log_must zpool create -f $pool_name $DISKS
	while ((i < cntctr)); do
	log_must zfs create $pool_name/$prefix_ctr$i
	((i += 1))
	done

	# create a zvol
	log_must zfs create -V 1g $pool_name/zone_zvol
	block_device_wait

	#
	# If current system support slog, add slog device for pool
	#
	if verify_slog_support ; then
	typeset sdevs="$TEST_BASE_DIR/sdev1 $TEST_BASE_DIR/sdev2"
	log_must mkfile $MINVDEVSIZE $sdevs
	log_must zpool add $pool_name log mirror $sdevs
	fi

	# this isn't supported just yet.
	# Create a filesystem. In order to add this to
	# the zone, it must have it's mountpoint set to 'legacy'
	# log_must zfs create $pool_name/zfs_filesystem
	# log_must zfs set mountpoint=legacy $pool_name/zfs_filesystem

	[[ -d $zone_root ]] && \
	log_must rm -rf $zone_root/$zone_name
	[[ ! -d $zone_root ]] && \
	log_must mkdir -p -m 0700 $zone_root/$zone_name

	# Create zone configure file and configure the zone
	#
	typeset zone_conf=/tmp/zone_conf.$$
	echo "create" > $zone_conf
	echo "set zonepath=$zone_root/$zone_name" >> $zone_conf
	echo "set autoboot=true" >> $zone_conf
	i=0
	while ((i < cntctr)); do
	echo "add dataset" >> $zone_conf
	echo "set name=$pool_name/$prefix_ctr$i" >> \
	$zone_conf
	echo "end" >> $zone_conf
	((i += 1))
	done

	# add our zvol to the zone
	echo "add device" >> $zone_conf
	echo "set match=/dev/zvol/dsk/$pool_name/zone_zvol" >> $zone_conf
	echo "end" >> $zone_conf

	# add a corresponding zvol rdsk to the zone
	echo "add device" >> $zone_conf
	echo "set match=$ZVOL_RDEVDIR/$pool_name/zone_zvol" >> $zone_conf
	echo "end" >> $zone_conf

	# once it's supported, we'll add our filesystem to the zone
	# echo "add fs" >> $zone_conf
	# echo "set type=zfs" >> $zone_conf
	# echo "set special=$pool_name/zfs_filesystem" >> $zone_conf
	# echo "set dir=/export/zfs_filesystem" >> $zone_conf
	# echo "end" >> $zone_conf

	echo "verify" >> $zone_conf
	echo "commit" >> $zone_conf
	log_must zonecfg -z $zone_name -f $zone_conf
	log_must rm -f $zone_conf

	# Install the zone
	zoneadm -z $zone_name install
	if (($? == 0)); then
	log_note "SUCCESS: zoneadm -z $zone_name install"
	else
	log_fail "FAIL: zoneadm -z $zone_name install"
	fi

	# Install sysidcfg file
	#
	typeset sysidcfg=$zone_root/$zone_name/root/etc/sysidcfg
	echo "system_locale=C" > $sysidcfg
	echo "terminal=dtterm" >> $sysidcfg
	echo "network_interface=primary {" >> $sysidcfg
	echo "hostname=$zone_name" >> $sysidcfg
	echo "}" >> $sysidcfg
	echo "name_service=NONE" >> $sysidcfg
	echo "root_password=mo791xfZ/SFiw" >> $sysidcfg
	echo "security_policy=NONE" >> $sysidcfg
	echo "timezone=US/Eastern" >> $sysidcfg

	# Boot this zone
	log_must zoneadm -z $zone_name boot
	}

	#
	# Reexport TESTPOOL & TESTPOOL(1-4)
	#
	function reexport_pool
	{
	typeset -i cntctr=5
	typeset -i i=0

	while ((i < cntctr)); do
	if ((i == 0)); then
	TESTPOOL=$ZONE_POOL/$ZONE_CTR$i
	if ! ismounted $TESTPOOL; then
	log_must zfs mount $TESTPOOL
	fi
	else
	eval TESTPOOL$i=$ZONE_POOL/$ZONE_CTR$i
	if eval ! ismounted \$TESTPOOL$i; then
	log_must eval zfs mount \$TESTPOOL$i
	fi
	fi
	((i += 1))
	done
	}

	#
	# Verify a given disk or pool state
	#
	# Return 0 is pool/disk matches expected state, 1 otherwise
	#
	function check_state # pool disk state{online,offline,degraded}
	{
	typeset pool=$1
	typeset disk=${2#$DEV_DSKDIR/}
	typeset state=$3

	[[ -z $pool ]] \|\| [[ -z $state ]] \
	&& log_fail "Arguments invalid or missing"

	if [[ -z $disk ]]; then
	#check pool state only
	zpool get -H -o value health $pool \
	\| grep -i "$state" > /dev/null 2>&1
	else
	zpool status -v $pool \| grep "$disk" \
	\| grep -i "$state" > /dev/null 2>&1
	fi

	return $?
	}

	#
	# Get the mountpoint of snapshot
	# For the snapshot use <mp_filesystem>/.zfs/snapshot/<snap>
	# as its mountpoint
	#
	function snapshot_mountpoint
	{
	typeset dataset=${1:-$TESTPOOL/$TESTFS@$TESTSNAP}

	if [[ $dataset != @ ]]; then
	log_fail "Error name of snapshot '$dataset'."
	fi

	typeset fs=${dataset%@*}
	typeset snap=${dataset#*@}

	if [[ -z $fs \|\| -z $snap ]]; then
	log_fail "Error name of snapshot '$dataset'."
	fi

	echo $(get_prop mountpoint $fs)/.zfs/snapshot/$snap
	}

	#
	# Given a device and 'ashift' value verify it's correctly set on every label
	#
	function verify_ashift # device ashift
	{
	typeset device="$1"
	typeset ashift="$2"

	zdb -e -lll $device \| awk -v ashift=$ashift '/ashift: / {
	if (ashift != $2)
	exit 1;
	else
	count++;
	} END {
	if (count != 4)
	exit 1;
	else
	exit 0;
	}'

	return $?
	}

	#
	# Given a pool and file system, this function will verify the file system
	# using the zdb internal tool. Note that the pool is exported and imported
	# to ensure it has consistent state.
	#
	function verify_filesys # pool filesystem dir
	{
	typeset pool="$1"
	typeset filesys="$2"
	typeset zdbout="/tmp/zdbout.$$"

	shift
	shift
	typeset dirs=$@
	typeset search_path=""

	log_note "Calling zdb to verify filesystem '$filesys'"
	zfs unmount -a > /dev/null 2>&1
	log_must zpool export $pool

	if [[ -n $dirs ]] ; then
	for dir in $dirs ; do
	search_path="$search_path -d $dir"
	done
	fi

	log_must zpool import $search_path $pool

	zdb -cudi $filesys > $zdbout 2>&1
	if [[ $? != 0 ]]; then
	log_note "Output: zdb -cudi $filesys"
	cat $zdbout
	log_fail "zdb detected errors with: '$filesys'"
	fi

	log_must zfs mount -a
	log_must rm -rf $zdbout
	}

	#
	# Given a pool issue a scrub and verify that no checksum errors are reported.
	#
	function verify_pool
	{
	typeset pool=${1:-$TESTPOOL}

	log_must zpool scrub $pool
	log_must wait_scrubbed $pool

	typeset -i cksum=$(zpool status $pool \| awk '
	!NF { isvdev = 0 }
	isvdev { errors += $NF }
	/CKSUM$/ { isvdev = 1 }
	END { print errors }
	')
	if [[ $cksum != 0 ]]; then
	log_must zpool status -v
	log_fail "Unexpected CKSUM errors found on $pool ($cksum)"
	fi
	}

	#
	# Given a pool, and this function list all disks in the pool
	#
	function get_disklist # pool
	{
	typeset disklist=""

	disklist=$(zpool iostat -v $1 \| nawk '(NR >4) {print $1}' \| \
	grep -v "\-\-\-\-\-" \| \
	egrep -v -e "^(mirror\|raidz[1-3]\|spare\|log\|cache\|special\|dedup)$")

	echo $disklist
	}

	#
	# Given a pool, and this function list all disks in the pool with their full
	# path (like "/dev/sda" instead of "sda").
	#
	function get_disklist_fullpath # pool
	{
	args="-P $1"
	get_disklist $args
	}



	# /**
	# This function kills a given list of processes after a time period. We use
	# this in the stress tests instead of STF_TIMEOUT so that we can have processes
	# run for a fixed amount of time, yet still pass. Tests that hit STF_TIMEOUT
	# would be listed as FAIL, which we don't want : we're happy with stress tests
	# running for a certain amount of time, then finishing.
	#
	# @param $1 the time in seconds after which we should terminate these processes
	# @param $2..$n the processes we wish to terminate.
	# */
	function stress_timeout
	{
	typeset -i TIMEOUT=$1
	shift
	typeset cpids="$@"

	log_note "Waiting for child processes($cpids). " \
	"It could last dozens of minutes, please be patient ..."
	log_must sleep $TIMEOUT

	log_note "Killing child processes after ${TIMEOUT} stress timeout."
	typeset pid
	for pid in $cpids; do
	ps -p $pid > /dev/null 2>&1
	if (($? == 0)); then
	log_must kill -USR1 $pid
	fi
	done
	}

	#
	# Verify a given hotspare disk is inuse or avail
	#
	# Return 0 is pool/disk matches expected state, 1 otherwise
	#
	function check_hotspare_state # pool disk state{inuse,avail}
	{
	typeset pool=$1
	typeset disk=${2#$DEV_DSKDIR/}
	typeset state=$3

	cur_state=$(get_device_state $pool $disk "spares")

	if [[ $state != ${cur_state} ]]; then
	return 1
	fi
	return 0
	}

	#
	# Wait until a hotspare transitions to a given state or times out.
	#
	# Return 0 when pool/disk matches expected state, 1 on timeout.
	#
	function wait_hotspare_state # pool disk state timeout
	{
	typeset pool=$1
	typeset disk=${2#*$DEV_DSKDIR/}
	typeset state=$3
	typeset timeout=${4:-60}
	typeset -i i=0

	while [[ $i -lt $timeout ]]; do
	if check_hotspare_state $pool $disk $state; then
	return 0
	fi

	i=$((i+1))
	sleep 1
	done

	return 1
	}

	#
	# Verify a given slog disk is inuse or avail
	#
	# Return 0 is pool/disk matches expected state, 1 otherwise
	#
	function check_slog_state # pool disk state{online,offline,unavail}
	{
	typeset pool=$1
	typeset disk=${2#$DEV_DSKDIR/}
	typeset state=$3

	cur_state=$(get_device_state $pool $disk "logs")

	if [[ $state != ${cur_state} ]]; then
	return 1
	fi
	return 0
	}

	#
	# Verify a given vdev disk is inuse or avail
	#
	# Return 0 is pool/disk matches expected state, 1 otherwise
	#
	function check_vdev_state # pool disk state{online,offline,unavail}
	{
	typeset pool=$1
	typeset disk=${2#*$DEV_DSKDIR/}
	typeset state=$3

	cur_state=$(get_device_state $pool $disk)

	if [[ $state != ${cur_state} ]]; then
	return 1
	fi
	return 0
	}

	#
	# Wait until a vdev transitions to a given state or times out.
	#
	# Return 0 when pool/disk matches expected state, 1 on timeout.
	#
	function wait_vdev_state # pool disk state timeout
	{
	typeset pool=$1
	typeset disk=${2#*$DEV_DSKDIR/}
	typeset state=$3
	typeset timeout=${4:-60}
	typeset -i i=0

	while [[ $i -lt $timeout ]]; do
	if check_vdev_state $pool $disk $state; then
	return 0
	fi

	i=$((i+1))
	sleep 1
	done

	return 1
	}

	#
	# Check the output of 'zpool status -v <pool>',
	# and to see if the content of <token> contain the <keyword> specified.
	#
	# Return 0 is contain, 1 otherwise
	#
	function check_pool_status # pool token keyword <verbose>
	{
	typeset pool=$1
	typeset token=$2
	typeset keyword=$3
	typeset verbose=${4:-false}

	scan=$(zpool status -v "$pool" 2>/dev/null \| nawk -v token="$token:" '
	($1==token) {print $0}')
	if [[ $verbose == true ]]; then
	log_note $scan
	fi
	echo $scan \| egrep -i "$keyword" > /dev/null 2>&1

	return $?
	}

	#
	# The following functions are instance of check_pool_status()
	# is_pool_resilvering - to check if the pool resilver is in progress
	# is_pool_resilvered - to check if the pool resilver is completed
	# is_pool_scrubbing - to check if the pool scrub is in progress
	# is_pool_scrubbed - to check if the pool scrub is completed
	# is_pool_scrub_stopped - to check if the pool scrub is stopped
	# is_pool_scrub_paused - to check if the pool scrub has paused
	# is_pool_removing - to check if the pool removing is a vdev
	# is_pool_removed - to check if the pool remove is completed
	# is_pool_discarding - to check if the pool checkpoint is being discarded
	#
	function is_pool_resilvering #pool <verbose>
	{
	check_pool_status "$1" "scan" \
	"resilver[ ()0-9A-Za-z:_-]* in progress since" $2
	return $?
	}

	function is_pool_resilvered #pool <verbose>
	{
	check_pool_status "$1" "scan" "resilvered " $2
	return $?
	}

	function is_pool_scrubbing #pool <verbose>
	{
	check_pool_status "$1" "scan" "scrub in progress since " $2
	return $?
	}

	function is_pool_scrubbed #pool <verbose>
	{
	check_pool_status "$1" "scan" "scrub repaired" $2
	return $?
	}

	function is_pool_scrub_stopped #pool <verbose>
	{
	check_pool_status "$1" "scan" "scrub canceled" $2
	return $?
	}

	function is_pool_scrub_paused #pool <verbose>
	{
	check_pool_status "$1" "scan" "scrub paused since " $2
	return $?
	}

	function is_pool_removing #pool
	{
	check_pool_status "$1" "remove" "in progress since "
	return $?
	}

	function is_pool_removed #pool
	{
	check_pool_status "$1" "remove" "completed on"
	return $?
	}

	function is_pool_discarding #pool
	{
	check_pool_status "$1" "checkpoint" "discarding"
	return $?
	}

	function wait_for_degraded
	{
	typeset pool=$1
	typeset timeout=${2:-30}
	typeset t0=$SECONDS

	while :; do
	[[ $(get_pool_prop health $pool) == "DEGRADED" ]] && break
	log_note "$pool is not yet degraded."
	sleep 1
	if ((SECONDS - t0 > $timeout)); then
	log_note "$pool not degraded after $timeout seconds."
	return 1
	fi
	done

	return 0
	}

	#
	# Use create_pool()/destroy_pool() to clean up the information in
	# in the given disk to avoid slice overlapping.
	#
	function cleanup_devices #vdevs
	{
	typeset pool="foopool$$"

	for vdev in $@; do
	zero_partitions $vdev
	done

	poolexists $pool && destroy_pool $pool
	create_pool $pool $@
	destroy_pool $pool

	return 0
	}

	#/**
	# A function to find and locate free disks on a system or from given
	# disks as the parameter. It works by locating disks that are in use
	# as swap devices and dump devices, and also disks listed in /etc/vfstab
	#
	# $@ given disks to find which are free, default is all disks in
	# the test system
	#
	# @return a string containing the list of available disks
	#*/
	function find_disks
	{
	# Trust provided list, no attempt is made to locate unused devices.
	if is_linux \|\| is_freebsd; then
	echo "$@"
	return
	fi


	sfi=/tmp/swaplist.$$
	dmpi=/tmp/dumpdev.$$
	max_finddisksnum=${MAX_FINDDISKSNUM:-6}

	swap -l > $sfi
	dumpadm > $dmpi 2>/dev/null

	# write an awk script that can process the output of format
	# to produce a list of disks we know about. Note that we have
	# to escape "$2" so that the shell doesn't interpret it while
	# we're creating the awk script.
	# -------------------
	cat > /tmp/find_disks.awk <<EOF
	#!/bin/nawk -f
	BEGIN { FS="."; }

	/^Specify disk/{
	searchdisks=0;
	}

	{
	if (searchdisks && \$2 !~ "^$"){
	split(\$2,arr," ");
	print arr[1];
	}
	}

	/^AVAILABLE DISK SELECTIONS:/{
	searchdisks=1;
	}
	EOF
	#---------------------

	chmod 755 /tmp/find_disks.awk
	disks=${@:-$(echo "" \| format -e 2>/dev/null \| /tmp/find_disks.awk)}
	rm /tmp/find_disks.awk

	unused=""
	for disk in $disks; do
	# Check for mounted
	grep "${disk}[sp]" /etc/mnttab >/dev/null
	(($? == 0)) && continue
	# Check for swap
	grep "${disk}[sp]" $sfi >/dev/null
	(($? == 0)) && continue
	# check for dump device
	grep "${disk}[sp]" $dmpi >/dev/null
	(($? == 0)) && continue
	# check to see if this disk hasn't been explicitly excluded
	# by a user-set environment variable
	echo "${ZFS_HOST_DEVICES_IGNORE}" \| grep "${disk}" > /dev/null
	(($? == 0)) && continue
	unused_candidates="$unused_candidates $disk"
	done
	rm $sfi
	rm $dmpi

	# now just check to see if those disks do actually exist
	# by looking for a device pointing to the first slice in
	# each case. limit the number to max_finddisksnum
	count=0
	for disk in $unused_candidates; do
	if is_disk_device $DEV_DSKDIR/${disk}s0 && \
	[ $count -lt $max_finddisksnum ]; then
	unused="$unused $disk"
	# do not impose limit if $@ is provided
	[[ -z $@ ]] && ((count = count + 1))
	fi
	done

	# finally, return our disk list
	echo $unused
	}

	function add_user_freebsd #<group_name> <user_name> <basedir>
	{
	typeset group=$1
	typeset user=$2
	typeset basedir=$3

	# Check to see if the user exists.
	if id $user > /dev/null 2>&1; then
	return 0
	fi

	# Assign 1000 as the base uid
	typeset -i uid=1000
	while true; do
	typeset -i ret
	pw useradd -u $uid -g $group -d $basedir/$user -m -n $user
	ret=$?
	case $ret in
	0) break ;;
	# The uid is not unique
	65) ((uid += 1)) ;;
	*) return 1 ;;
	esac
	if [[ $uid == 65000 ]]; then
	log_fail "No user id available under 65000 for $user"
	fi
	done

	# Silence MOTD
	touch $basedir/$user/.hushlogin

	return 0
	}

	#
	# Delete the specified user.
	#
	# $1 login name
	#
	function del_user_freebsd #<logname>
	{
	typeset user=$1

	if id $user > /dev/null 2>&1; then
	log_must pw userdel $user
	fi

	return 0
	}

	#
	# Select valid gid and create specified group.
	#
	# $1 group name
	#
	function add_group_freebsd #<group_name>
	{
	typeset group=$1

	# See if the group already exists.
	if pw groupshow $group >/dev/null 2>&1; then
	return 0
	fi

	# Assign 1000 as the base gid
	typeset -i gid=1000
	while true; do
	pw groupadd -g $gid -n $group > /dev/null 2>&1
	typeset -i ret=$?
	case $ret in
	0) return 0 ;;
	# The gid is not unique
	65) ((gid += 1)) ;;
	*) return 1 ;;
	esac
	if [[ $gid == 65000 ]]; then
	log_fail "No user id available under 65000 for $group"
	fi
	done
	}

	#
	# Delete the specified group.
	#
	# $1 group name
	#
	function del_group_freebsd #<group_name>
	{
	typeset group=$1

	pw groupdel -n $group > /dev/null 2>&1
	typeset -i ret=$?
	case $ret in
	# Group does not exist, or was deleted successfully.
	0\|6\|65) return 0 ;;
	# Name already exists as a group name
	9) log_must pw groupdel $group ;;
	*) return 1 ;;
	esac

	return 0
	}

	function add_user_illumos #<group_name> <user_name> <basedir>
	{
	typeset group=$1
	typeset user=$2
	typeset basedir=$3

	log_must useradd -g $group -d $basedir/$user -m $user

	return 0
	}

	function del_user_illumos #<user_name>
	{
	typeset user=$1

	if id $user > /dev/null 2>&1; then
	log_must_retry "currently used" 6 userdel $user
	fi

	return 0
	}

	function add_group_illumos #<group_name>
	{
	typeset group=$1

	typeset -i gid=100
	while true; do
	groupadd -g $gid $group > /dev/null 2>&1
	typeset -i ret=$?
	case $ret in
	0) return 0 ;;
	# The gid is not unique
	4) ((gid += 1)) ;;
	*) return 1 ;;
	esac
	done
	}

	function del_group_illumos #<group_name>
	{
	typeset group=$1

	groupmod -n $grp $grp > /dev/null 2>&1
	typeset -i ret=$?
	case $ret in
	# Group does not exist.
	6) return 0 ;;
	# Name already exists as a group name
	9) log_must groupdel $grp ;;
	*) return 1 ;;
	esac
	}

	function add_user_linux #<group_name> <user_name> <basedir>
	{
	typeset group=$1
	typeset user=$2
	typeset basedir=$3

	log_must useradd -g $group -d $basedir/$user -m $user

	# Add new users to the same group and the command line utils.
	# This allows them to be run out of the original users home
	# directory as long as it permissioned to be group readable.
	cmd_group=$(stat --format="%G" $(which zfs))
	log_must usermod -a -G $cmd_group $user

	return 0
	}

	function del_user_linux #<user_name>
	{
	typeset user=$1

	if id $user > /dev/null 2>&1; then
	log_must_retry "currently used" 6 userdel $user
	fi

	return 0
	}

	function add_group_linux #<group_name>
	{
	typeset group=$1

	# Assign 100 as the base gid, a larger value is selected for
	# Linux because for many distributions 1000 and under are reserved.
	while true; do
	groupadd $group > /dev/null 2>&1
	typeset -i ret=$?
	case $ret in
	0) return 0 ;;
	*) return 1 ;;
	esac
	done
	}

	function del_group_linux #<group_name>
	{
	typeset group=$1

	getent group $group > /dev/null 2>&1
	typeset -i ret=$?
	case $ret in
	# Group does not exist.
	2) return 0 ;;
	# Name already exists as a group name
	0) log_must groupdel $group ;;
	*) return 1 ;;
	esac

	return 0
	}

	#
	# Add specified user to specified group
	#
	# $1 group name
	# $2 user name
	# $3 base of the homedir (optional)
	#
	function add_user #<group_name> <user_name> <basedir>
	{
	typeset group=$1
	typeset user=$2
	typeset basedir=${3:-"/var/tmp"}

	if ((${#group} == 0 \|\| ${#user} == 0)); then
	log_fail "group name or user name are not defined."
	fi

	case $(uname) in
	FreeBSD)
	add_user_freebsd "$group" "$user" "$basedir"
	;;
	Linux)
	add_user_linux "$group" "$user" "$basedir"
	;;
	*)
	add_user_illumos "$group" "$user" "$basedir"
	;;
	esac

	return 0
	}

	#
	# Delete the specified user.
	#
	# $1 login name
	# $2 base of the homedir (optional)
	#
	function del_user #<logname> <basedir>
	{
	typeset user=$1
	typeset basedir=${2:-"/var/tmp"}

	if ((${#user} == 0)); then
	log_fail "login name is necessary."
	fi

	case $(uname) in
	FreeBSD)
	del_user_freebsd "$user"
	;;
	Linux)
	del_user_linux "$user"
	;;
	*)
	del_user_illumos "$user"
	;;
	esac

	[[ -d $basedir/$user ]] && rm -fr $basedir/$user

	return 0
	}

	#
	# Select valid gid and create specified group.
	#
	# $1 group name
	#
	function add_group #<group_name>
	{
	typeset group=$1

	if ((${#group} == 0)); then
	log_fail "group name is necessary."
	fi

	case $(uname) in
	FreeBSD)
	add_group_freebsd "$group"
	;;
	Linux)
	add_group_linux "$group"
	;;
	*)
	add_group_illumos "$group"
	;;
	esac

	return 0
	}

	#
	# Delete the specified group.
	#
	# $1 group name
	#
	function del_group #<group_name>
	{
	typeset group=$1

	if ((${#group} == 0)); then
	log_fail "group name is necessary."
	fi

	case $(uname) in
	FreeBSD)
	del_group_freebsd "$group"
	;;
	Linux)
	del_group_linux "$group"
	;;
	*)
	del_group_illumos "$group"
	;;
	esac

	return 0
	}

	#
	# This function will return true if it's safe to destroy the pool passed
	# as argument 1. It checks for pools based on zvols and files, and also
	# files contained in a pool that may have a different mountpoint.
	#
	function safe_to_destroy_pool { # $1 the pool name

	typeset pool=""
	typeset DONT_DESTROY=""

	# We check that by deleting the $1 pool, we're not
	# going to pull the rug out from other pools. Do this
	# by looking at all other pools, ensuring that they
	# aren't built from files or zvols contained in this pool.

	for pool in $(zpool list -H -o name)
	do
	ALTMOUNTPOOL=""

	# this is a list of the top-level directories in each of the
	# files that make up the path to the files the pool is based on
	FILEPOOL=$(zpool status -v $pool \| grep /$1/ \| \
	awk '{print $1}')

	# this is a list of the zvols that make up the pool
	ZVOLPOOL=$(zpool status -v $pool \| grep "$ZVOL_DEVDIR/$1$" \
	\| awk '{print $1}')

	# also want to determine if it's a file-based pool using an
	# alternate mountpoint...
	POOL_FILE_DIRS=$(zpool status -v $pool \| \
	grep / \| awk '{print $1}' \| \
	awk -F/ '{print $2}' \| grep -v "dev")

	for pooldir in $POOL_FILE_DIRS
	do
	OUTPUT=$(zfs list -H -r -o mountpoint $1 \| \
	grep "${pooldir}$" \| awk '{print $1}')

	ALTMOUNTPOOL="${ALTMOUNTPOOL}${OUTPUT}"
	done


	if [ ! -z "$ZVOLPOOL" ]
	then
	DONT_DESTROY="true"
	log_note "Pool $pool is built from $ZVOLPOOL on $1"
	fi

	if [ ! -z "$FILEPOOL" ]
	then
	DONT_DESTROY="true"
	log_note "Pool $pool is built from $FILEPOOL on $1"
	fi

	if [ ! -z "$ALTMOUNTPOOL" ]
	then
	DONT_DESTROY="true"
	log_note "Pool $pool is built from $ALTMOUNTPOOL on $1"
	fi
	done

	if [ -z "${DONT_DESTROY}" ]
	then
	return 0
	else
	log_note "Warning: it is not safe to destroy $1!"
	return 1
	fi
	}

	#
	# Verify zfs operation with -p option work as expected
	# $1 operation, value could be create, clone or rename
	# $2 dataset type, value could be fs or vol
	# $3 dataset name
	# $4 new dataset name
	#
	function verify_opt_p_ops
	{
	typeset ops=$1
	typeset datatype=$2
	typeset dataset=$3
	typeset newdataset=$4

	if [[ $datatype != "fs" && $datatype != "vol" ]]; then
	log_fail "$datatype is not supported."
	fi

	# check parameters accordingly
	case $ops in
	create)
	newdataset=$dataset
	dataset=""
	if [[ $datatype == "vol" ]]; then
	ops="create -V $VOLSIZE"
	fi
	;;
	clone)
	if [[ -z $newdataset ]]; then
	log_fail "newdataset should not be empty" \
	"when ops is $ops."
	fi
	log_must datasetexists $dataset
	log_must snapexists $dataset
	;;
	rename)
	if [[ -z $newdataset ]]; then
	log_fail "newdataset should not be empty" \
	"when ops is $ops."
	fi
	log_must datasetexists $dataset
	;;
	*)
	log_fail "$ops is not supported."
	;;
	esac

	# make sure the upper level filesystem does not exist
	destroy_dataset "${newdataset%/*}" "-rRf"

	# without -p option, operation will fail
	log_mustnot zfs $ops $dataset $newdataset
	log_mustnot datasetexists $newdataset ${newdataset%/*}

	# with -p option, operation should succeed
	log_must zfs $ops -p $dataset $newdataset
	block_device_wait

	if ! datasetexists $newdataset ; then
	log_fail "-p option does not work for $ops"
	fi

	# when $ops is create or clone, redo the operation still return zero
	if [[ $ops != "rename" ]]; then
	log_must zfs $ops -p $dataset $newdataset
	fi

	return 0
	}

	#
	# Get configuration of pool
	# $1 pool name
	# $2 config name
	#
	function get_config
	{
	typeset pool=$1
	typeset config=$2
	typeset alt_root

	if ! poolexists "$pool" ; then
	return 1
	fi
	alt_root=$(zpool list -H $pool \| awk '{print $NF}')
	if [[ $alt_root == "-" ]]; then
	value=$(zdb -C $pool \| grep "$config:" \| awk -F: \
	'{print $2}')
	else
	value=$(zdb -e $pool \| grep "$config:" \| awk -F: \
	'{print $2}')
	fi
	if [[ -n $value ]] ; then
	value=${value#'}
	value=${value%'}
	fi
	echo $value

	return 0
	}

	#
	# Privated function. Random select one of items from arguments.
	#
	# $1 count
	# $2-n string
	#
	function _random_get
	{
	typeset cnt=$1
	shift

	typeset str="$@"
	typeset -i ind
	((ind = RANDOM % cnt + 1))

	typeset ret=$(echo "$str" \| cut -f $ind -d ' ')
	echo $ret
	}

	#
	# Random select one of item from arguments which include NONE string
	#
	function random_get_with_non
	{
	typeset -i cnt=$#
	((cnt =+ 1))

	_random_get "$cnt" "$@"
	}

	#
	# Random select one of item from arguments which doesn't include NONE string
	#
	function random_get
	{
	_random_get "$#" "$@"
	}

	#
	# Detect if the current system support slog
	#
	function verify_slog_support
	{
	typeset dir=$TEST_BASE_DIR/disk.$$
	typeset pool=foo.$$
	typeset vdev=$dir/a
	typeset sdev=$dir/b

	mkdir -p $dir
	mkfile $MINVDEVSIZE $vdev $sdev

	typeset -i ret=0
	if ! zpool create -n $pool $vdev log $sdev > /dev/null 2>&1; then
	ret=1
	fi
	rm -r $dir

	return $ret
	}

	#
	# The function will generate a dataset name with specific length
	# $1, the length of the name
	# $2, the base string to construct the name
	#
	function gen_dataset_name
	{
	typeset -i len=$1
	typeset basestr="$2"
	typeset -i baselen=${#basestr}
	typeset -i iter=0
	typeset l_name=""

	if ((len % baselen == 0)); then
	((iter = len / baselen))
	else
	((iter = len / baselen + 1))
	fi
	while ((iter > 0)); do
	l_name="${l_name}$basestr"

	((iter -= 1))
	done

	echo $l_name
	}

	#
	# Get cksum tuple of dataset
	# $1 dataset name
	#
	# sample zdb output:
	# Dataset data/test [ZPL], ID 355, cr_txg 2413856, 31.0K, 7 objects, rootbp
	# DVA[0]=<0:803046400:200> DVA[1]=<0:81199000:200> [L0 DMU objset] fletcher4
	# lzjb LE contiguous unique double size=800L/200P birth=2413856L/2413856P
	# fill=7 cksum=11ce125712:643a9c18ee2:125e25238fca0:254a3f74b59744
	function datasetcksum
	{
	typeset cksum
	sync
	cksum=$(zdb -vvv $1 \| grep "^Dataset $1 \[" \| grep "cksum" \
	\| awk -F= '{print $7}')
	echo $cksum
	}

	#
	# Get cksum of file
	# #1 file path
	#
	function checksum
	{
	typeset cksum
	cksum=$(cksum $1 \| awk '{print $1}')
	echo $cksum
	}

	#
	# Get the given disk/slice state from the specific field of the pool
	#
	function get_device_state #pool disk field("", "spares","logs")
	{
	typeset pool=$1
	typeset disk=${2#$DEV_DSKDIR/}
	typeset field=${3:-$pool}

	state=$(zpool status -v "$pool" 2>/dev/null \| \
	nawk -v device=$disk -v pool=$pool -v field=$field \
	'BEGIN {startconfig=0; startfield=0; }
	/config:/ {startconfig=1}
	(startconfig==1) && ($1==field) {startfield=1; next;}
	(startfield==1) && ($1==device) {print $2; exit;}
	(startfield==1) &&
	($1==field \|\| $1 ~ "^spares$" \|\| $1 ~ "^logs$") {startfield=0}')
	echo $state
	}


	#
	# print the given directory filesystem type
	#
	# $1 directory name
	#
	function get_fstype
	{
	typeset dir=$1

	if [[ -z $dir ]]; then
	log_fail "Usage: get_fstype <directory>"
	fi

	#
	# $ df -n /
	# / : ufs
	#
	df -n $dir \| awk '{print $3}'
	}

	#
	# Given a disk, label it to VTOC regardless what label was on the disk
	# $1 disk
	#
	function labelvtoc
	{
	typeset disk=$1
	if [[ -z $disk ]]; then
	log_fail "The disk name is unspecified."
	fi
	typeset label_file=/var/tmp/labelvtoc.$$
	typeset arch=$(uname -p)

	if is_linux \|\| is_freebsd; then
	log_note "Currently unsupported by the test framework"
	return 1
	fi

	if [[ $arch == "i386" ]]; then
	echo "label" > $label_file
	echo "0" >> $label_file
	echo "" >> $label_file
	echo "q" >> $label_file
	echo "q" >> $label_file

	fdisk -B $disk >/dev/null 2>&1
	# wait a while for fdisk finishes
	sleep 60
	elif [[ $arch == "sparc" ]]; then
	echo "label" > $label_file
	echo "0" >> $label_file
	echo "" >> $label_file
	echo "" >> $label_file
	echo "" >> $label_file
	echo "q" >> $label_file
	else
	log_fail "unknown arch type"
	fi

	format -e -s -d $disk -f $label_file
	typeset -i ret_val=$?
	rm -f $label_file
	#
	# wait the format to finish
	#
	sleep 60
	if ((ret_val != 0)); then
	log_fail "unable to label $disk as VTOC."
	fi

	return 0
	}

	#
	# check if the system was installed as zfsroot or not
	# return: 0 if zfsroot, non-zero if not
	#
	function is_zfsroot
	{
	df -n / \| grep zfs > /dev/null 2>&1
	return $?
	}

	#
	# get the root filesystem name if it's zfsroot system.
	#
	# return: root filesystem name
	function get_rootfs
	{
	typeset rootfs=""

	if is_freebsd; then
	rootfs=$(mount -p \| awk '$2 == "/" && $3 == "zfs" {print $1}')
	elif ! is_linux; then
	rootfs=$(awk '{if ($2 == "/" && $3 == "zfs") print $1}' \
	/etc/mnttab)
	fi
	if [[ -z "$rootfs" ]]; then
	log_fail "Can not get rootfs"
	fi
	zfs list $rootfs > /dev/null 2>&1
	if (($? == 0)); then
	echo $rootfs
	else
	log_fail "This is not a zfsroot system."
	fi
	}

	#
	# get the rootfs's pool name
	# return:
	# rootpool name
	#
	function get_rootpool
	{
	typeset rootfs=""
	typeset rootpool=""

	if is_freebsd; then
	rootfs=$(mount -p \| awk '$2 == "/" && $3 == "zfs" {print $1}')
	elif ! is_linux; then
	rootfs=$(awk '{if ($2 == "/" && $3 =="zfs") print $1}' \
	/etc/mnttab)
	fi
	if [[ -z "$rootfs" ]]; then
	log_fail "Can not get rootpool"
	fi
	zfs list $rootfs > /dev/null 2>&1
	if (($? == 0)); then
	echo ${rootfs%%/*}
	else
	log_fail "This is not a zfsroot system."
	fi
	}

	#
	# Get the word numbers from a string separated by white space
	#
	function get_word_count
	{
	echo $1 \| wc -w
	}

	#
	# To verify if the require numbers of disks is given
	#
	function verify_disk_count
	{
	typeset -i min=${2:-1}

	typeset -i count=$(get_word_count "$1")

	if ((count < min)); then
	log_untested "A minimum of $min disks is required to run." \
	" You specified $count disk(s)"
	fi
	}

	function ds_is_volume
	{
	typeset type=$(get_prop type $1)
	[[ $type = "volume" ]] && return 0
	return 1
	}

	function ds_is_filesystem
	{
	typeset type=$(get_prop type $1)
	[[ $type = "filesystem" ]] && return 0
	return 1
	}

	function ds_is_snapshot
	{
	typeset type=$(get_prop type $1)
	[[ $type = "snapshot" ]] && return 0
	return 1
	}

	#
	# Check if Trusted Extensions are installed and enabled
	#
	function is_te_enabled
	{
	svcs -H -o state labeld 2>/dev/null \| grep "enabled"
	if (($? != 0)); then
	return 1
	else
	return 0
	fi
	}

	# Utility function to determine if a system has multiple cpus.
	function is_mp
	{
	if is_linux; then
	(($(nproc) > 1))
	elif is_freebsd; then
	sysctl -n kern.smp.cpus
	else
	(($(psrinfo \| wc -l) > 1))
	fi

	return $?
	}

	function get_cpu_freq
	{
	if is_linux; then
	lscpu \| awk '/CPU MHz/ { print $3 }'
	elif is_freebsd; then
	sysctl -n hw.clockrate
	else
	psrinfo -v 0 \| awk '/processor operates at/ {print $6}'
	fi
	}

	# Run the given command as the user provided.
	function user_run
	{
	typeset user=$1
	shift

	log_note "user: $user"
	log_note "cmd: $*"

	typeset out=$TEST_BASE_DIR/out
	typeset err=$TEST_BASE_DIR/err

	sudo -Eu $user env PATH="$PATH" ksh <<<"$*" >$out 2>$err
	typeset res=$?
	log_note "out: $(<$out)"
	log_note "err: $(<$err)"
	return $res
	}

	#
	# Check if the pool contains the specified vdevs
	#
	# $1 pool
	# $2..n <vdev> ...
	#
	# Return 0 if the vdevs are contained in the pool, 1 if any of the specified
	# vdevs is not in the pool, and 2 if pool name is missing.
	#
	function vdevs_in_pool
	{
	typeset pool=$1
	typeset vdev

	if [[ -z $pool ]]; then
	log_note "Missing pool name."
	return 2
	fi

	shift

	# We could use 'zpool list' to only get the vdevs of the pool but we
	# can't reference a mirror/raidz vdev using its ID (i.e mirror-0),
	# therefore we use the 'zpool status' output.
	typeset tmpfile=$(mktemp)
	zpool status -v "$pool" \| grep -A 1000 "config:" >$tmpfile
	for vdev in $@; do
	grep -w ${vdev##*/} $tmpfile >/dev/null 2>&1
	[[ $? -ne 0 ]] && return 1
	done

	rm -f $tmpfile

	return 0;
	}

	function get_max
	{
	typeset -l i max=$1
	shift

	for i in "$@"; do
	max=$((max > i ? max : i))
	done

	echo $max
	}

	function get_min
	{
	typeset -l i min=$1
	shift

	for i in "$@"; do
	min=$((min < i ? min : i))
	done

	echo $min
	}

	# Write data that can be compressed into a directory
	function write_compressible
	{
	typeset dir=$1
	typeset megs=$2
	typeset nfiles=${3:-1}
	typeset bs=${4:-1024k}
	typeset fname=${5:-file}

	[[ -d $dir ]] \|\| log_fail "No directory: $dir"

	# Under Linux fio is not currently used since its behavior can
	# differ significantly across versions. This includes missing
	# command line options and cases where the --buffer_compress_*
	# options fail to behave as expected.
	if is_linux; then
	typeset file_bytes=$(to_bytes $megs)
	typeset bs_bytes=4096
	typeset blocks=$(($file_bytes / $bs_bytes))

	for (( i = 0; i < $nfiles; i++ )); do
	truncate -s $file_bytes $dir/$fname.$i

	# Write every third block to get 66% compression.
	for (( j = 0; j < $blocks; j += 3 )); do
	dd if=/dev/urandom of=$dir/$fname.$i \
	seek=$j bs=$bs_bytes count=1 \
	conv=notrunc >/dev/null 2>&1
	done
	done
	else
	log_must eval "fio \
	--name=job \
	--fallocate=0 \
	--minimal \
	--randrepeat=0 \
	--buffer_compress_percentage=66 \
	--buffer_compress_chunk=4096 \
	--directory=$dir \
	--numjobs=$nfiles \
	--nrfiles=$nfiles \
	--rw=write \
	--bs=$bs \
	--filesize=$megs \
	--filename_format='$fname.\$jobnum' >/dev/null"
	fi
	}

	function get_objnum
	{
	typeset pathname=$1
	typeset objnum

	[[ -e $pathname ]] \|\| log_fail "No such file or directory: $pathname"
	if is_freebsd; then
	objnum=$(stat -f "%i" $pathname)
	else
	objnum=$(stat -c %i $pathname)
	fi
	echo $objnum
	}

	#
	# Sync data to the pool
	#
	# $1 pool name
	# $2 boolean to force uberblock (and config including zpool cache file) update
	#
	function sync_pool #pool <force>
	{
	typeset pool=${1:-$TESTPOOL}
	typeset force=${2:-false}

	if [[ $force == true ]]; then
	log_must zpool sync -f $pool
	else
	log_must zpool sync $pool
	fi

	return 0
	}

	#
	# Wait for zpool 'freeing' property drops to zero.
	#
	# $1 pool name
	#
	function wait_freeing #pool
	{
	typeset pool=${1:-$TESTPOOL}
	while true; do
	[[ "0" == "$(zpool list -Ho freeing $pool)" ]] && break
	log_must sleep 1
	done
	}

	#
	# Wait for every device replace operation to complete
	#
	# $1 pool name
	#
	function wait_replacing #pool
	{
	typeset pool=${1:-$TESTPOOL}
	while true; do
	[[ "" == "$(zpool status $pool \|
	awk '/replacing-[0-9]+/ {print $1}')" ]] && break
	log_must sleep 1
	done
	}

	#
	# Wait for a pool to be scrubbed
	#
	# $1 pool name
	#
	function wait_scrubbed
	{
	typeset pool=${1:-$TESTPOOL}
	while ! is_pool_scrubbed $pool ; do
	sleep 1
	done
	}

	# Backup the zed.rc in our test directory so that we can edit it for our test.
	#
	# Returns: Backup file name. You will need to pass this to zed_rc_restore().
	function zed_rc_backup
	{
	zedrc_backup="$(mktemp)"
	cp $ZEDLET_DIR/zed.rc $zedrc_backup
	echo $zedrc_backup
	}

	function zed_rc_restore
	{
	mv $1 $ZEDLET_DIR/zed.rc
	}

	#
	# Setup custom environment for the ZED.
	#
	# $@ Optional list of zedlets to run under zed.
	function zed_setup
	{
	if ! is_linux; then
	log_unsupported "No zed on $(uname)"
	fi

	if [[ ! -d $ZEDLET_DIR ]]; then
	log_must mkdir $ZEDLET_DIR
	fi

	if [[ ! -e $VDEVID_CONF ]]; then
	log_must touch $VDEVID_CONF
	fi

	if [[ -e $VDEVID_CONF_ETC ]]; then
	log_fail "Must not have $VDEVID_CONF_ETC file present on system"
	fi
	EXTRA_ZEDLETS=$@

	# Create a symlink for /etc/zfs/vdev_id.conf file.
	log_must ln -s $VDEVID_CONF $VDEVID_CONF_ETC

	# Setup minimal ZED configuration. Individual test cases should
	# add additional ZEDLETs as needed for their specific test.
	log_must cp ${ZEDLET_ETC_DIR}/zed.rc $ZEDLET_DIR
	log_must cp ${ZEDLET_ETC_DIR}/zed-functions.sh $ZEDLET_DIR

	# Scripts must only be user writable.
	if [[ -n "$EXTRA_ZEDLETS" ]] ; then
	saved_umask=$(umask)
	log_must umask 0022
	for i in $EXTRA_ZEDLETS ; do
	log_must cp ${ZEDLET_LIBEXEC_DIR}/$i $ZEDLET_DIR
	done
	log_must umask $saved_umask
	fi

	# Customize the zed.rc file to enable the full debug log.
	log_must sed -i '/\#ZED_DEBUG_LOG=.*/d' $ZEDLET_DIR/zed.rc
	echo "ZED_DEBUG_LOG=$ZED_DEBUG_LOG" >>$ZEDLET_DIR/zed.rc

	}

	#
	# Cleanup custom ZED environment.
	#
	# $@ Optional list of zedlets to remove from our test zed.d directory.
	function zed_cleanup
	{
	if ! is_linux; then
	return
	fi
	EXTRA_ZEDLETS=$@

	log_must rm -f ${ZEDLET_DIR}/zed.rc
	log_must rm -f ${ZEDLET_DIR}/zed-functions.sh
	log_must rm -f ${ZEDLET_DIR}/all-syslog.sh
	log_must rm -f ${ZEDLET_DIR}/all-debug.sh
	log_must rm -f ${ZEDLET_DIR}/state

	if [[ -n "$EXTRA_ZEDLETS" ]] ; then
	for i in $EXTRA_ZEDLETS ; do
	log_must rm -f ${ZEDLET_DIR}/$i
	done
	fi
	log_must rm -f $ZED_LOG
	log_must rm -f $ZED_DEBUG_LOG
	log_must rm -f $VDEVID_CONF_ETC
	log_must rm -f $VDEVID_CONF
	rmdir $ZEDLET_DIR
	}

	#
	# Check if ZED is currently running, if not start ZED.
	#
	function zed_start
	{
	if ! is_linux; then
	return
	fi

	# ZEDLET_DIR=/var/tmp/zed
	if [[ ! -d $ZEDLET_DIR ]]; then
	log_must mkdir $ZEDLET_DIR
	fi

	# Verify the ZED is not already running.
	pgrep -x zed > /dev/null
	if (($? == 0)); then
	log_note "ZED already running"
	else
	log_note "Starting ZED"
	# run ZED in the background and redirect foreground logging
	# output to $ZED_LOG.
	log_must truncate -s 0 $ZED_DEBUG_LOG
	log_must eval "zed -vF -d $ZEDLET_DIR -P $PATH" \
	"-s $ZEDLET_DIR/state -j 1 2>$ZED_LOG &"
	fi

	return 0
	}

	#
	# Kill ZED process
	#
	function zed_stop
	{
	if ! is_linux; then
	return
	fi

	log_note "Stopping ZED"
	while true; do
	zedpids="$(pgrep -x zed)"
	[ "$?" -ne 0 ] && break

	log_must kill $zedpids
	sleep 1
	done
	return 0
	}

	#
	# Drain all zevents
	#
	function zed_events_drain
	{
	while [ $(zpool events -H \| wc -l) -ne 0 ]; do
	sleep 1
	zpool events -c >/dev/null
	done
	}

	# Set a variable in zed.rc to something, un-commenting it in the process.
	#
	# $1 variable
	# $2 value
	function zed_rc_set
	{
	var="$1"
	val="$2"
	# Remove the line
	cmd="'/$var/d'"
	eval sed -i $cmd $ZEDLET_DIR/zed.rc

	# Add it at the end
	echo "$var=$val" >> $ZEDLET_DIR/zed.rc
	}


	#
	# Check is provided device is being active used as a swap device.
	#
	function is_swap_inuse
	{
	typeset device=$1

	if [[ -z $device ]] ; then
	log_note "No device specified."
	return 1
	fi

	if is_linux; then
	swapon -s \| grep -w $(readlink -f $device) > /dev/null 2>&1
	elif is_freebsd; then
	swapctl -l \| grep -w $device
	else
	swap -l \| grep -w $device > /dev/null 2>&1
	fi

	return $?
	}

	#
	# Setup a swap device using the provided device.
	#
	function swap_setup
	{
	typeset swapdev=$1

	if is_linux; then
	log_must eval "mkswap $swapdev > /dev/null 2>&1"
	log_must swapon $swapdev
	elif is_freebsd; then
	log_must swapctl -a $swapdev
	else
	log_must swap -a $swapdev
	fi

	return 0
	}

	#
	# Cleanup a swap device on the provided device.
	#
	function swap_cleanup
	{
	typeset swapdev=$1

	if is_swap_inuse $swapdev; then
	if is_linux; then
	log_must swapoff $swapdev
	elif is_freebsd; then
	log_must swapoff $swapdev
	else
	log_must swap -d $swapdev
	fi
	fi

	return 0
	}

	#
	# Set a global system tunable (64-bit value)
	#
	# $1 tunable name (use a NAME defined in tunables.cfg)
	# $2 tunable values
	#
	function set_tunable64
	{
	set_tunable_impl "$1" "$2" Z
	}

	#
	# Set a global system tunable (32-bit value)
	#
	# $1 tunable name (use a NAME defined in tunables.cfg)
	# $2 tunable values
	#
	function set_tunable32
	{
	set_tunable_impl "$1" "$2" W
	}

	function set_tunable_impl
	{
	typeset name="$1"
	typeset value="$2"
	typeset mdb_cmd="$3"
	typeset module="${4:-zfs}"

	eval "typeset tunable=\$$name"
	case "$tunable" in
	UNSUPPORTED)
	log_unsupported "Tunable '$name' is unsupported on $(uname)"
	;;
	"")
	log_fail "Tunable '$name' must be added to tunables.cfg"
	;;
	*)
	;;
	esac

	[[ -z "$value" ]] && return 1
	[[ -z "$mdb_cmd" ]] && return 1

	case "$(uname)" in
	Linux)
	typeset zfs_tunables="/sys/module/$module/parameters"
	[[ -w "$zfs_tunables/$tunable" ]] \|\| return 1
	cat >"$zfs_tunables/$tunable" <<<"$value"
	return $?
	;;
	FreeBSD)
	sysctl vfs.zfs.$tunable=$value
	return "$?"
	;;
	SunOS)
	[[ "$module" -eq "zfs" ]] \|\| return 1
	echo "${tunable}/${mdb_cmd}0t${value}" \| mdb -kw
	return $?
	;;
	esac
	}

	#
	# Get a global system tunable
	#
	# $1 tunable name (use a NAME defined in tunables.cfg)
	#
	function get_tunable
	{
	get_tunable_impl "$1"
	}

	function get_tunable_impl
	{
	typeset name="$1"
	typeset module="${2:-zfs}"

	eval "typeset tunable=\$$name"
	case "$tunable" in
	UNSUPPORTED)
	log_unsupported "Tunable '$name' is unsupported on $(uname)"
	;;
	"")
	log_fail "Tunable '$name' must be added to tunables.cfg"
	;;
	*)
	;;
	esac

	case "$(uname)" in
	Linux)
	typeset zfs_tunables="/sys/module/$module/parameters"
	[[ -f "$zfs_tunables/$tunable" ]] \|\| return 1
	cat $zfs_tunables/$tunable
	return $?
	;;
	FreeBSD)
	sysctl -n vfs.zfs.$tunable
	;;
	SunOS)
	[[ "$module" -eq "zfs" ]] \|\| return 1
	;;
	esac

	return 1
	}

	#
	# Prints the current time in seconds since UNIX Epoch.
	#
	function current_epoch
	{
	printf '%(%s)T'
	}

	#
	# Get decimal value of global uint32_t variable using mdb.
	#
	function mdb_get_uint32
	{
	typeset variable=$1
	typeset value

	value=$(mdb -k -e "$variable/X \| ::eval .=U")
	if [[ $? -ne 0 ]]; then
	log_fail "Failed to get value of '$variable' from mdb."
	return 1
	fi

	echo $value
	return 0
	}

	#
	# Set global uint32_t variable to a decimal value using mdb.
	#
	function mdb_set_uint32
	{
	typeset variable=$1
	typeset value=$2

	mdb -kw -e "$variable/W 0t$value" > /dev/null
	if [[ $? -ne 0 ]]; then
	echo "Failed to set '$variable' to '$value' in mdb."
	return 1
	fi

	return 0
	}

	#
	# Set global scalar integer variable to a hex value using mdb.
	# Note: Target should have CTF data loaded.
	#
	function mdb_ctf_set_int
	{
	typeset variable=$1
	typeset value=$2

	mdb -kw -e "$variable/z $value" > /dev/null
	if [[ $? -ne 0 ]]; then
	echo "Failed to set '$variable' to '$value' in mdb."
	return 1
	fi

	return 0
	}

	#
	# Compute MD5 digest for given file or stdin if no file given.
	# Note: file path must not contain spaces
	#
	function md5digest
	{
	typeset file=$1

	case $(uname) in
	FreeBSD)
	md5 -q $file
	;;
	*)
	md5sum -b $file \| awk '{ print $1 }'
	;;
	esac
	}

	#
	# Compute SHA256 digest for given file or stdin if no file given.
	# Note: file path must not contain spaces
	#
	function sha256digest
	{
	typeset file=$1

	case $(uname) in
	FreeBSD)
	sha256 -q $file
	;;
	*)
	sha256sum -b $file \| awk '{ print $1 }'
	;;
	esac
	}

	function new_fs #<args>
	{
	case $(uname) in
	FreeBSD)
	newfs "$@"
	;;
	*)
	echo y \| newfs -v "$@"
	;;
	esac
	}

	function stat_size #<path>
	{
	typeset path=$1

	case $(uname) in
	FreeBSD)
	stat -f %z "$path"
	;;
	*)
	stat -c %s "$path"
	;;
	esac
	}

	+function stat_ctime #<path>
	+{
	+ typeset path=$1
	+
	+ case $(uname) in
	+ FreeBSD)
	+ stat -f %c "$path"
	+ ;;
	+ *)
	+ stat -c %Z "$path"
	+ ;;
	+ esac
	+}
	+
	+function stat_crtime #<path>
	+{
	+ typeset path=$1
	+
	+ case $(uname) in
	+ FreeBSD)
	+ stat -f %B "$path"
	+ ;;
	+ *)
	+ stat -c %W "$path"
	+ ;;
	+ esac
	+}
	+
	# Run a command as if it was being run in a TTY.
	#
	# Usage:
	#
	# faketty command
	#
	function faketty
	{
	if is_freebsd; then
	script -q /dev/null env "$@"
	else
	script --return --quiet -c "$*" /dev/null
	fi
	}

	#
	# Produce a random permutation of the integers in a given range (inclusive).
	#
	function range_shuffle # begin end
	{
	typeset -i begin=$1
	typeset -i end=$2

	seq ${begin} ${end} \| sort -R
	}

	#
	# Cross-platform xattr helpers
	#

	function get_xattr # name path
	{
	typeset name=$1
	typeset path=$2

	case $(uname) in
	FreeBSD)
	getextattr -qq user "${name}" "${path}"
	;;
	*)
	attr -qg "${name}" "${path}"
	;;
	esac
	}

	function set_xattr # name value path
	{
	typeset name=$1
	typeset value=$2
	typeset path=$3

	case $(uname) in
	FreeBSD)
	setextattr user "${name}" "${value}" "${path}"
	;;
	*)
	attr -qs "${name}" -V "${value}" "${path}"
	;;
	esac
	}

	function set_xattr_stdin # name value
	{
	typeset name=$1
	typeset path=$2

	case $(uname) in
	FreeBSD)
	setextattr -i user "${name}" "${path}"
	;;
	*)
	attr -qs "${name}" "${path}"
	;;
	esac
	}

	function rm_xattr # name path
	{
	typeset name=$1
	typeset path=$2

	case $(uname) in
	FreeBSD)
	rmextattr -q user "${name}" "${path}"
	;;
	*)
	attr -qr "${name}" "${path}"
	;;
	esac
	}

	function ls_xattr # path
	{
	typeset path=$1

	case $(uname) in
	FreeBSD)
	lsextattr -qq user "${path}"
	;;
	*)
	attr -ql "${path}"
	;;
	esac
	}

	function kstat # stat flags?
	{
	typeset stat=$1
	typeset flags=${2-"-n"}

	case $(uname) in
	FreeBSD)
	sysctl $flags kstat.zfs.misc.$stat
	;;
	Linux)
	typeset zfs_kstat="/proc/spl/kstat/zfs/$stat"
	[[ -f "$zfs_kstat" ]] \|\| return 1
	cat $zfs_kstat
	;;
	*)
	false
	;;
	esac
	}

	function get_arcstat # stat
	{
	typeset stat=$1

	case $(uname) in
	FreeBSD)
	kstat arcstats.$stat
	;;
	Linux)
	kstat arcstats \| awk "/$stat/ { print \$3 }"
	;;
	*)
	false
	;;
	esac
	}

	#
	# Wait for the specified arcstat to reach non-zero quiescence.
	# If echo is 1 echo the value after reaching quiescence, otherwise
	# if echo is 0 print the arcstat we are waiting on.
	#
	function arcstat_quiescence # stat echo
	{
	typeset stat=$1
	typeset echo=$2
	typeset do_once=true

	if [[ $echo -eq 0 ]]; then
	echo "Waiting for arcstat $1 quiescence."
	fi

	while $do_once \|\| [ $stat1 -ne $stat2 ] \|\| [ $stat2 -eq 0 ]; do
	typeset stat1=$(get_arcstat $stat)
	sleep 2
	typeset stat2=$(get_arcstat $stat)
	do_once=false
	done

	if [[ $echo -eq 1 ]]; then
	echo $stat2
	fi
	}

	function arcstat_quiescence_noecho # stat
	{
	typeset stat=$1
	arcstat_quiescence $stat 0
	}

	function arcstat_quiescence_echo # stat
	{
	typeset stat=$1
	arcstat_quiescence $stat 1
	}

	#
	# Given an array of pids, wait until all processes
	# have completed and check their return status.
	#
	function wait_for_children #children
	{
	rv=0
	children=("$@")
	for child in "${children[@]}"
	do
	child_exit=0
	wait ${child} \|\| child_exit=$?
	if [ $child_exit -ne 0 ]; then
	echo "child ${child} failed with ${child_exit}"
	rv=1
	fi
	done
	return $rv
	}
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/include/tunables.cfg b/sys/contrib/openzfs/tests/zfs-tests/include/tunables.cfg
	index a1b75a48292f..56d430a39875 100644
	--- a/sys/contrib/openzfs/tests/zfs-tests/include/tunables.cfg
	+++ b/sys/contrib/openzfs/tests/zfs-tests/include/tunables.cfg
	@@ -1,95 +1,95 @@
	# This file exports variables for each tunable used in the test suite.
	#
	# Different platforms use different names for most tunables. To avoid littering
	# the tests with conditional logic for deciding how to set each tunable, the
	# logic is instead consolidated to this one file.
	#
	# Any use of tunables in tests must use a name defined here. New entries
	# should be added to the table as needed. Please keep the table sorted
	# alphabetically for ease of maintenance.
	#
	# Platform-specific tunables should still use a NAME from this table for
	# consistency. Enter UNSUPPORTED in the column for platforms on which the
	# tunable is not implemented.

	UNAME=$(uname)

	# NAME FreeBSD tunable Linux tunable
	cat <<%%%% \|
	ADMIN_SNAPSHOT UNSUPPORTED zfs_admin_snapshot
	ALLOW_REDACTED_DATASET_MOUNT allow_redacted_dataset_mount zfs_allow_redacted_dataset_mount
	ARC_MAX arc.max zfs_arc_max
	ARC_MIN arc.min zfs_arc_min
	ASYNC_BLOCK_MAX_BLOCKS async_block_max_blocks zfs_async_block_max_blocks
	CHECKSUM_EVENTS_PER_SECOND checksum_events_per_second zfs_checksum_events_per_second
	COMMIT_TIMEOUT_PCT commit_timeout_pct zfs_commit_timeout_pct
	COMPRESSED_ARC_ENABLED compressed_arc_enabled zfs_compressed_arc_enabled
	CONDENSE_INDIRECT_COMMIT_ENTRY_DELAY_MS condense.indirect_commit_entry_delay_ms zfs_condense_indirect_commit_entry_delay_ms
	CONDENSE_INDIRECT_OBSOLETE_PCT condense.indirect_obsolete_pct zfs_condense_indirect_obsolete_pct
	CONDENSE_MIN_MAPPING_BYTES condense.min_mapping_bytes zfs_condense_min_mapping_bytes
	-DBUF_CACHE_MAX_BYTES dbuf_cache.max_bytes dbuf_cache_max_bytes
	+DBUF_CACHE_SHIFT dbuf.cache_shift dbuf_cache_shift
	DEADMAN_CHECKTIME_MS deadman.checktime_ms zfs_deadman_checktime_ms
	DEADMAN_FAILMODE deadman.failmode zfs_deadman_failmode
	DEADMAN_SYNCTIME_MS deadman.synctime_ms zfs_deadman_synctime_ms
	DEADMAN_ZIOTIME_MS deadman.ziotime_ms zfs_deadman_ziotime_ms
	DISABLE_IVSET_GUID_CHECK disable_ivset_guid_check zfs_disable_ivset_guid_check
	INITIALIZE_CHUNK_SIZE initialize_chunk_size zfs_initialize_chunk_size
	INITIALIZE_VALUE initialize_value zfs_initialize_value
	KEEP_LOG_SPACEMAPS_AT_EXPORT keep_log_spacemaps_at_export zfs_keep_log_spacemaps_at_export
	LUA_MAX_MEMLIMIT lua.max_memlimit zfs_lua_max_memlimit
	L2ARC_MFUONLY l2arc.mfuonly l2arc_mfuonly
	L2ARC_NOPREFETCH l2arc.noprefetch l2arc_noprefetch
	L2ARC_REBUILD_BLOCKS_MIN_L2SIZE l2arc.rebuild_blocks_min_l2size l2arc_rebuild_blocks_min_l2size
	L2ARC_REBUILD_ENABLED l2arc.rebuild_enabled l2arc_rebuild_enabled
	L2ARC_TRIM_AHEAD l2arc.trim_ahead l2arc_trim_ahead
	L2ARC_WRITE_BOOST l2arc.write_boost l2arc_write_boost
	L2ARC_WRITE_MAX l2arc.write_max l2arc_write_max
	LIVELIST_CONDENSE_NEW_ALLOC livelist.condense.new_alloc zfs_livelist_condense_new_alloc
	LIVELIST_CONDENSE_SYNC_CANCEL livelist.condense.sync_cancel zfs_livelist_condense_sync_cancel
	LIVELIST_CONDENSE_SYNC_PAUSE livelist.condense.sync_pause zfs_livelist_condense_sync_pause
	LIVELIST_CONDENSE_ZTHR_CANCEL livelist.condense.zthr_cancel zfs_livelist_condense_zthr_cancel
	LIVELIST_CONDENSE_ZTHR_PAUSE livelist.condense.zthr_pause zfs_livelist_condense_zthr_pause
	LIVELIST_MAX_ENTRIES livelist.max_entries zfs_livelist_max_entries
	LIVELIST_MIN_PERCENT_SHARED livelist.min_percent_shared zfs_livelist_min_percent_shared
	MAX_DATASET_NESTING max_dataset_nesting zfs_max_dataset_nesting
	MAX_MISSING_TVDS max_missing_tvds zfs_max_missing_tvds
	METASLAB_DEBUG_LOAD metaslab.debug_load metaslab_debug_load
	METASLAB_FORCE_GANGING metaslab.force_ganging metaslab_force_ganging
	MULTIHOST_FAIL_INTERVALS multihost.fail_intervals zfs_multihost_fail_intervals
	MULTIHOST_HISTORY multihost.history zfs_multihost_history
	MULTIHOST_IMPORT_INTERVALS multihost.import_intervals zfs_multihost_import_intervals
	MULTIHOST_INTERVAL multihost.interval zfs_multihost_interval
	OVERRIDE_ESTIMATE_RECORDSIZE send.override_estimate_recordsize zfs_override_estimate_recordsize
	PREFETCH_DISABLE prefetch.disable zfs_prefetch_disable
	REBUILD_SCRUB_ENABLED rebuild_scrub_enabled zfs_rebuild_scrub_enabled
	REMOVAL_SUSPEND_PROGRESS removal_suspend_progress zfs_removal_suspend_progress
	REMOVE_MAX_SEGMENT remove_max_segment zfs_remove_max_segment
	RESILVER_MIN_TIME_MS resilver_min_time_ms zfs_resilver_min_time_ms
	SCAN_LEGACY scan_legacy zfs_scan_legacy
	SCAN_SUSPEND_PROGRESS scan_suspend_progress zfs_scan_suspend_progress
	SCAN_VDEV_LIMIT scan_vdev_limit zfs_scan_vdev_limit
	SEND_HOLES_WITHOUT_BIRTH_TIME send_holes_without_birth_time send_holes_without_birth_time
	SLOW_IO_EVENTS_PER_SECOND slow_io_events_per_second zfs_slow_io_events_per_second
	SPA_ASIZE_INFLATION spa.asize_inflation spa_asize_inflation
	SPA_DISCARD_MEMORY_LIMIT spa.discard_memory_limit zfs_spa_discard_memory_limit
	SPA_LOAD_VERIFY_DATA spa.load_verify_data spa_load_verify_data
	SPA_LOAD_VERIFY_METADATA spa.load_verify_metadata spa_load_verify_metadata
	TRIM_EXTENT_BYTES_MIN trim.extent_bytes_min zfs_trim_extent_bytes_min
	TRIM_METASLAB_SKIP trim.metaslab_skip zfs_trim_metaslab_skip
	TRIM_TXG_BATCH trim.txg_batch zfs_trim_txg_batch
	TXG_HISTORY txg.history zfs_txg_history
	TXG_TIMEOUT txg.timeout zfs_txg_timeout
	UNLINK_SUSPEND_PROGRESS UNSUPPORTED zfs_unlink_suspend_progress
	VDEV_FILE_PHYSICAL_ASHIFT vdev.file.physical_ashift vdev_file_physical_ashift
	VDEV_MIN_MS_COUNT vdev.min_ms_count zfs_vdev_min_ms_count
	VDEV_VALIDATE_SKIP vdev.validate_skip vdev_validate_skip
	VOL_INHIBIT_DEV UNSUPPORTED zvol_inhibit_dev
	VOL_MODE vol.mode zvol_volmode
	VOL_RECURSIVE vol.recursive UNSUPPORTED
	ZEVENT_LEN_MAX zevent.len_max zfs_zevent_len_max
	ZEVENT_RETAIN_MAX zevent.retain_max zfs_zevent_retain_max
	ZIO_SLOW_IO_MS zio.slow_io_ms zio_slow_io_ms
	%%%%
	while read name FreeBSD Linux; do
	eval "export ${name}=\$${UNAME}"
	done
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/Makefile.am b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/Makefile.am
	index 3a5b7b0b9747..137cddd5f784 100644
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/Makefile.am
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/Makefile.am
	@@ -1,91 +1,92 @@
	SUBDIRS = \
	acl \
	alloc_class \
	arc \
	atime \
	bootfs \
	btree \
	cache \
	cachefile \
	casenorm \
	channel_program \
	chattr \
	checksum \
	clean_mirror \
	cli_root \
	cli_user \
	compression \
	cp_files \
	+ crtime \
	ctime \
	deadman \
	delegate \
	devices \
	events \
	exec \
	fallocate \
	fault \
	features \
	grow \
	history \
	hkdf \
	inheritance \
	inuse \
	io \
	l2arc \
	large_files \
	largest_pool \
	libzfs \
	limits \
	link_count \
	log_spacemap \
	migration \
	mmap \
	mmp \
	mount \
	mv_files \
	nestedfs \
	no_space \
	nopwrite \
	online_offline \
	pam \
	pool_checkpoint \
	pool_names \
	poolversion \
	privilege \
	procfs \
	projectquota \
	pyzfs \
	quota \
	raidz \
	redacted_send \
	redundancy \
	refquota \
	refreserv \
	removal \
	rename_dirs \
	replacement \
	reservation \
	rootpool \
	rsend \
	scrub_mirror \
	slog \
	snapshot \
	snapused \
	sparse \
	suid \
	threadsappend \
	trim \
	truncate \
	upgrade \
	user_namespace \
	userquota \
	vdev_zaps \
	write_dirs \
	xattr \
	zpool_influxdb \
	zvol

	if BUILD_LINUX
	SUBDIRS += \
	tmpfile
	endif
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_copies/zfs_copies.kshlib b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_copies/zfs_copies.kshlib
	index e886de432af4..1273ed59df30 100644
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_copies/zfs_copies.kshlib
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_copies/zfs_copies.kshlib
	@@ -1,158 +1,157 @@
	#
	# CDDL HEADER START
	#
	# The contents of this file are subject to the terms of the
	# Common Development and Distribution License (the "License").
	# You may not use this file except in compliance with the License.
	#
	# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	# or http://www.opensolaris.org/os/licensing.
	# See the License for the specific language governing permissions
	# and limitations under the License.
	#
	# When distributing Covered Code, include this CDDL HEADER in each
	# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	# If applicable, add the following below this CDDL HEADER, with the
	# fields enclosed by brackets "[]" replaced with your own identifying
	# information: Portions Copyright [yyyy] [name of copyright owner]
	#
	# CDDL HEADER END
	#

	#
	# Copyright 2008 Sun Microsystems, Inc. All rights reserved.
	# Use is subject to license terms.
	#

	#
	# Copyright (c) 2012, 2016 by Delphix. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/functional/cli_root/zfs_copies/zfs_copies.cfg

	#
	# Compare the value of copies property with specified value
	# $1, the dataset name
	# $2, the expected copies value
	#
	function cmp_prop
	{
	typeset ds=$1
	typeset val_expect=$2
	typeset val_actual

	val_actual=$(get_prop copies $ds)
	if [[ $val_actual != $val_expect ]]; then
	log_fail "Expected value ($val_expect) != actual value " \
	"($val_actual)"
	fi
	}

	#
	# Check the used space is charged correctly
	# $1, the number of used space
	# $2, the expected common factor between the used space and the file space
	#
	function check_used
	{
	typeset charged_spc=$1
	typeset -i used
	typeset -i expected_cfactor=$2
	typeset -i cfactor
	typeset -i fsize=${FILESIZE%[m\|M]}

	((used = $charged_spc / 1024 / 1024))
	((cfactor = used / fsize))
	if ((cfactor != expected_cfactor)); then
	log_fail "The space is not charged correctly while setting" \
	"copies as $expected_cfactor."
	fi
	}

	#
	# test ncopies on volume
	# $1 test type zfs\|ufs\|ext2
	# $2 copies
	# $3 mntp for ufs\|ext2 test
	function do_vol_test
	{
	typeset type=$1
	typeset copies=$2
	typeset mntp=$3

	vol=$TESTPOOL/$TESTVOL1
	vol_b_path=$ZVOL_DEVDIR/$TESTPOOL/$TESTVOL1
	- vol_r_path=$ZVOL_RDEVDIR/$TESTPOOL/$TESTVOL1

	log_must zfs create -V $VOLSIZE -o copies=$copies $vol
	log_must zfs set refreservation=none $vol
	- block_device_wait
	+ block_device_wait $vol_b_path

	case "$type" in
	"ext2")
	if is_freebsd; then
	log_unsupported "ext2 test not implemented for freebsd"
	fi
	- log_must eval "new_fs $vol_r_path >/dev/null 2>&1"
	+ log_must eval "new_fs $vol_b_path >/dev/null 2>&1"
	log_must mount -o rw $vol_b_path $mntp
	;;
	"ufs")
	if is_linux; then
	log_unsupported "ufs test not implemented for linux"
	fi
	- log_must eval "new_fs $vol_r_path >/dev/null 2>&1"
	+ log_must eval "new_fs $vol_b_path >/dev/null 2>&1"
	log_must mount $vol_b_path $mntp
	;;
	"zfs")
	if is_freebsd; then
	# Pool creation on zvols is forbidden by default.
	# Save and restore the current setting.
	typeset _saved=$(get_tunable VOL_RECURSIVE)
	log_must set_tunable64 VOL_RECURSIVE 1 # Allow
	zpool create $TESTPOOL1 $vol_b_path
	typeset _zpool_create_result=$?
	log_must set_tunable64 VOL_RECURSIVE $_saved # Restore
	log_must test $_zpool_create_result = 0
	else
	log_must zpool create $TESTPOOL1 $vol_b_path
	fi
	log_must zfs create $TESTPOOL1/$TESTFS1
	;;
	*)
	log_unsupported "$type test not implemented"
	;;
	esac

	((nfilesize = copies * ${FILESIZE%m}))
	pre_used=$(get_prop used $vol)
	((target_size = pre_used + nfilesize))

	if [[ $type == "zfs" ]]; then
	log_must mkfile $FILESIZE /$TESTPOOL1/$TESTFS1/$FILE
	else
	log_must mkfile $FILESIZE $mntp/$FILE
	fi

	post_used=$(get_prop used $vol)
	((retries = 0))
	while ((post_used < target_size && retries++ < 42)); do
	sleep 1
	post_used=$(get_prop used $vol)
	done

	((used = post_used - pre_used))
	if ((used < nfilesize)); then
	log_fail "The space is not charged correctly while setting" \
	"copies as $copies ($used < $nfilesize)" \
	"pre=${pre_used} post=${post_used}"
	fi

	if [[ $type == "zfs" ]]; then
	log_must zpool destroy $TESTPOOL1
	else
	log_must umount $mntp
	fi

	log_must zfs destroy $vol
	}
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_timestamp.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_timestamp.ksh
	index a4cedca49ce8..62c4e768c0a1 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_timestamp.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_timestamp.ksh
	@@ -1,104 +1,100 @@
	#!/bin/ksh -p
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib

	#
	# DESCRIPTION:
	# 'zfs diff -t' should display inode change time correctly.
	#
	# STRATEGY:
	# 1. Create a snapshot
	# 2. Create some files with a random delay and snapshot the filesystem again
	# 3. Verify 'zfs diff -t' correctly display timestamps
	#

	verify_runnable "both"

	function cleanup
	{
	for snap in $TESTSNAP1 $TESTSNAP2; do
	if snapexists "$snap"; then
	log_must zfs destroy "$snap"
	fi
	done
	find "$MNTPOINT" -type f -delete
	rm -f "$FILEDIFF"
	}

	#
	# Creates $count files in $fspath. Waits a random delay between each file.
	#
	function create_random # <fspath> <count>
	{
	fspath="$1"
	typeset -i count="$2"
	typeset -i i=0

	while (( i < count )); do
	log_must touch "$fspath/file$i"
	sleep $(random_int_between 1 3)
	(( i = i + 1 ))
	done
	}

	log_assert "'zfs diff -t' should display inode change time correctly."
	log_onexit cleanup

	DATASET="$TESTPOOL/$TESTFS"
	TESTSNAP1="$DATASET@snap1"
	TESTSNAP2="$DATASET@snap2"
	MNTPOINT="$(get_prop mountpoint $DATASET)"
	FILEDIFF="$TESTDIR/zfs-diff.txt"
	FILENUM=5

	# 1. Create a snapshot
	log_must zfs snapshot "$TESTSNAP1"

	# 2. Create some files with a random delay and snapshot the filesystem again
	create_random "$MNTPOINT" $FILENUM
	log_must zfs snapshot "$TESTSNAP2"

	# 3. Verify 'zfs diff -t' correctly display timestamps
	typeset -i count=0
	log_must eval "zfs diff -t $TESTSNAP1 $TESTSNAP2 > $FILEDIFF"
	awk '{print substr($1,1,index($1,".")-1)" "$NF}' < "$FILEDIFF" \| while read line
	do
	read ctime file <<< "$line"

	# If path from 'zfs diff' is not a file (could be xattr object) skip it
	if [[ ! -f "$file" ]]; then
	continue;
	fi

	- if is_freebsd; then
	- filetime="$(stat -f "%c" $file)"
	- else
	- filetime="$(stat -c '%Z' $file)"
	- fi
	+ filetime=$(stat_ctime $file)
	if [[ "$filetime" != "$ctime" ]]; then
	log_fail "Unexpected ctime for file $file ($filetime != $ctime)"
	else
	log_note "Correct ctime read on $file: $ctime"
	fi

	(( i = i + 1 ))
	done
	if [[ $i != $FILENUM ]]; then
	log_fail "Wrong number of files verified ($i != $FILENUM)"
	fi

	log_pass "'zfs diff -t' displays inode change time correctly."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_rename/zfs_rename_006_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_rename/zfs_rename_006_pos.ksh
	index 3ad7d4e80562..4d1605152201 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_rename/zfs_rename_006_pos.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_rename/zfs_rename_006_pos.ksh
	@@ -1,85 +1,85 @@
	#!/bin/ksh
	#
	# CDDL HEADER START
	#
	# The contents of this file are subject to the terms of the
	# Common Development and Distribution License (the "License").
	# You may not use this file except in compliance with the License.
	#
	# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	# or http://www.opensolaris.org/os/licensing.
	# See the License for the specific language governing permissions
	# and limitations under the License.
	#
	# When distributing Covered Code, include this CDDL HEADER in each
	# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	# If applicable, add the following below this CDDL HEADER, with the
	# fields enclosed by brackets "[]" replaced with your own identifying
	# information: Portions Copyright [yyyy] [name of copyright owner]
	#
	# CDDL HEADER END
	#

	#
	# Copyright 2007 Sun Microsystems, Inc. All rights reserved.
	# Use is subject to license terms.
	#

	#
	# Copyright (c) 2015, 2016 by Delphix. All rights reserved.
	#
	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/functional/cli_root/zfs_rename/zfs_rename.kshlib

	#
	# DESCRIPTION:
	# 'zfs rename' can successfully rename a volume snapshot.
	#
	# STRATEGY:
	# 1. Create a snapshot of volume.
	# 2. Rename volume snapshot to a new one.
	# 3. Rename volume to a new one.
	# 4. Create a clone of the snapshot.
	# 5. Verify that the rename operations are successful and zfs list can
	# list them.
	#
	###############################################################################

	verify_runnable "global"

	#
	# cleanup defined in zfs_rename.kshlib
	#
	log_onexit cleanup

	log_assert "'zfs rename' can successfully rename a volume snapshot."

	vol=$TESTPOOL/$TESTVOL
	snap=$TESTSNAP

	log_must eval "dd if=$DATA of=$VOL_R_PATH bs=$BS count=$CNT >/dev/null 2>&1"
	if ! snapexists $vol@$snap; then
	log_must zfs snapshot $vol@$snap
	fi

	rename_dataset $vol@$snap $vol@${snap}-new
	rename_dataset $vol ${vol}-new
	rename_dataset ${vol}-new@${snap}-new ${vol}-new@$snap
	rename_dataset ${vol}-new $vol

	clone=$TESTPOOL/${snap}_clone
	create_clone $vol@$snap $clone
	-block_device_wait
	+block_device_wait $VOLDATA

	#verify data integrity
	for input in $VOL_R_PATH $ZVOL_RDEVDIR/$clone; do
	log_must eval "dd if=$input of=$VOLDATA bs=$BS count=$CNT >/dev/null 2>&1"
	if ! cmp_data $VOLDATA $DATA ; then
	log_fail "$input gets corrupted after rename operation."
	fi
	done

	destroy_clone $clone
	log_must zfs destroy $vol@$snap

	log_pass "'zfs rename' can rename volume snapshot as expected."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_rename/zfs_rename_007_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_rename/zfs_rename_007_pos.ksh
	index 3623d2bca1c9..0cacb7a98fa2 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_rename/zfs_rename_007_pos.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zfs_rename/zfs_rename_007_pos.ksh
	@@ -1,155 +1,155 @@
	#!/bin/ksh -p
	#
	# CDDL HEADER START
	#
	# The contents of this file are subject to the terms of the
	# Common Development and Distribution License (the "License").
	# You may not use this file except in compliance with the License.
	#
	# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	# or http://www.opensolaris.org/os/licensing.
	# See the License for the specific language governing permissions
	# and limitations under the License.
	#
	# When distributing Covered Code, include this CDDL HEADER in each
	# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	# If applicable, add the following below this CDDL HEADER, with the
	# fields enclosed by brackets "[]" replaced with your own identifying
	# information: Portions Copyright [yyyy] [name of copyright owner]
	#
	# CDDL HEADER END
	#

	#
	# Copyright 2007 Sun Microsystems, Inc. All rights reserved.
	# Use is subject to license terms.
	#

	#
	# Copyright (c) 2012, 2016 by Delphix. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/functional/cli_root/zfs_rename/zfs_rename.kshlib

	#
	# DESCRIPTION:
	# Rename dataset, verify that the data haven't changed.
	#
	# STRATEGY:
	# 1. Create random data and copy to dataset.
	# 2. Perform renaming commands.
	# 3. Verify that the data haven't changed.
	#

	verify_runnable "both"

	function cleanup
	{
	if datasetexists $TESTPOOL/$TESTFS ; then
	log_must zfs destroy -Rf $TESTPOOL/$TESTFS
	fi
	log_must zfs create $TESTPOOL/$TESTFS
	log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS

	rm -f $SRC_FILE $DST_FILE
	}

	function target_obj
	{
	typeset dtst=$1

	typeset obj
	typeset type=$(get_prop type $dtst)
	if [[ $type == "filesystem" ]]; then
	obj=$(get_prop mountpoint $dtst)/${SRC_FILE##*/}
	elif [[ $type == "volume" ]]; then
	obj=$ZVOL_DEVDIR/$dtst
	fi

	echo $obj
	}

	log_assert "Rename dataset, verify that the data haven't changed."
	log_onexit cleanup

	# Generate random data
	#
	BS=512 ; CNT=2048
	SRC_FILE=$TESTDIR/srcfile.$$
	DST_FILE=$TESTDIR/dstfile.$$
	log_must dd if=/dev/urandom of=$SRC_FILE bs=$BS count=$CNT

	fs=$TESTPOOL/$TESTFS/fs.$$
	fsclone=$TESTPOOL/$TESTFS/fsclone.$$
	log_must zfs create $fs

	obj=$(target_obj $fs)
	log_must cp $SRC_FILE $obj

	snap=${fs}@snap.$$
	log_must zfs snapshot $snap
	log_must zfs clone $snap $fsclone

	# Rename dataset & clone
	#
	log_must zfs rename $fs ${fs}-new
	log_must zfs rename $fsclone ${fsclone}-new

	# Compare source file and target file
	#
	obj=$(target_obj ${fs}-new)
	log_must diff $SRC_FILE $obj
	obj=$(target_obj ${fsclone}-new)
	log_must diff $SRC_FILE $obj

	# Rename snapshot and re-clone dataset
	#
	log_must zfs rename ${fs}-new $fs
	log_must zfs rename $snap ${snap}-new
	log_must zfs clone ${snap}-new $fsclone

	# Compare source file and target file
	#
	obj=$(target_obj $fsclone)
	log_must diff $SRC_FILE $obj

	if is_global_zone; then
	vol=$TESTPOOL/$TESTFS/vol.$$ ; volclone=$TESTPOOL/$TESTFS/volclone.$$
	log_must zfs create -V 100M $vol
	- block_device_wait

	obj=$(target_obj $vol)
	+ block_device_wait $obj
	log_must dd if=$SRC_FILE of=$obj bs=$BS count=$CNT

	snap=${vol}@snap.$$
	log_must zfs snapshot $snap
	log_must zfs clone $snap $volclone
	- block_device_wait

	# Rename dataset & clone
	log_must zfs rename $vol ${vol}-new
	log_must zfs rename $volclone ${volclone}-new
	- block_device_wait

	# Compare source file and target file
	obj=$(target_obj ${vol}-new)
	+ block_device_wait $obj
	log_must dd if=$obj of=$DST_FILE bs=$BS count=$CNT
	log_must diff $SRC_FILE $DST_FILE
	obj=$(target_obj ${volclone}-new)
	+ block_device_wait $obj
	log_must dd if=$obj of=$DST_FILE bs=$BS count=$CNT
	log_must diff $SRC_FILE $DST_FILE

	# Rename snapshot and re-clone dataset
	log_must zfs rename ${vol}-new $vol
	log_must zfs rename $snap ${snap}-new
	log_must zfs clone ${snap}-new $volclone
	- block_device_wait

	# Compare source file and target file
	obj=$(target_obj $volclone)
	+ block_device_wait $obj
	log_must dd if=$obj of=$DST_FILE bs=$BS count=$CNT
	log_must diff $SRC_FILE $DST_FILE
	fi

	log_pass "Rename dataset, the data haven't changed passed."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_errata3.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_errata3.ksh
	index 86baf1f6e35d..40b6ca1c1897 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_errata3.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_errata3.ksh
	@@ -1,103 +1,103 @@
	#!/bin/ksh -p
	#
	# CDDL HEADER START
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#
	# CDDL HEADER END
	#

	#
	# Copyright (c) 2017 Datto, Inc. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib

	#
	# DESCRIPTION:
	# 'zpool import' should import a pool with Errata #3 while preventing
	# the user from performing read write operations
	#
	# STRATEGY:
	# 1. Import a pre-packaged pool with Errata #3
	# 2. Attempt to write to the effected datasets
	# 3. Attempt to read from the effected datasets
	# 4. Attempt to perform a raw send of the effected datasets
	# 5. Perform a regular send of the datasets under a new encryption root
	# 6. Verify the new datasets can be read from and written to
	# 7. Destroy the old effected datasets
	# 8. Reimport the pool and verify that the errata is no longer present
	#

	verify_runnable "global"

	POOL_NAME=cryptv0
	POOL_FILE=cryptv0.dat

	function uncompress_pool
	{
	log_note "Creating pool from $POOL_FILE"
	log_must bzcat \
	$STF_SUITE/tests/functional/cli_root/zpool_import/blockfiles/$POOL_FILE.bz2 \
	> /$TESTPOOL/$POOL_FILE
	return 0
	}

	function cleanup
	{
	poolexists $POOL_NAME && log_must zpool destroy $POOL_NAME
	[[ -e /$TESTPOOL/$POOL_FILE ]] && rm /$TESTPOOL/$POOL_FILE
	return 0
	}
	log_onexit cleanup

	log_assert "Verify that Errata 3 is properly handled"

	uncompress_pool
	log_must zpool import -d /$TESTPOOL/ $POOL_NAME
	log_must eval "zpool status $POOL_NAME \| grep -q Errata" # also detects 'Errata #4'
	log_must eval "zpool status $POOL_NAME \| grep -q ZFS-8000-ER"
	log_must eval "echo 'password' \| zfs load-key $POOL_NAME/testfs"
	log_must eval "echo 'password' \| zfs load-key $POOL_NAME/testvol"

	log_mustnot zfs mount $POOL_NAME/testfs
	log_must zfs mount -o ro $POOL_NAME/testfs

	old_mntpnt=$(get_prop mountpoint $POOL_NAME/testfs)
	log_must eval "ls $old_mntpnt \| grep -q testfile"
	-block_device_wait
	+block_device_wait /dev/zvol/$POOL_NAME/testvol
	log_mustnot dd if=/dev/zero of=/dev/zvol/$POOL_NAME/testvol bs=512 count=1
	log_must dd if=/dev/zvol/$POOL_NAME/testvol of=/dev/null bs=512 count=1

	log_must zpool set feature@bookmark_v2=enabled $POOL_NAME # necessary for Errata #4

	log_must eval "echo 'password' \| zfs create \
	-o encryption=on -o keyformat=passphrase -o keylocation=prompt \
	$POOL_NAME/encroot"
	log_mustnot eval "zfs send -w $POOL_NAME/testfs@snap1 \| \
	zfs recv $POOL_NAME/encroot/testfs"
	log_mustnot eval "zfs send -w $POOL_NAME/testvol@snap1 \| \
	zfs recv $POOL_NAME/encroot/testvol"

	log_must eval "zfs send $POOL_NAME/testfs@snap1 \| \
	zfs recv $POOL_NAME/encroot/testfs"
	log_must eval "zfs send $POOL_NAME/testvol@snap1 \| \
	zfs recv $POOL_NAME/encroot/testvol"
	-block_device_wait
	+block_device_wait /dev/zvol/$POOL_NAME/encroot/testvol
	log_must dd if=/dev/zero of=/dev/zvol/$POOL_NAME/encroot/testvol bs=512 count=1
	new_mntpnt=$(get_prop mountpoint $POOL_NAME/encroot/testfs)
	log_must eval "ls $new_mntpnt \| grep -q testfile"
	log_must zfs destroy -r $POOL_NAME/testfs
	log_must zfs destroy -r $POOL_NAME/testvol

	log_must zpool export $POOL_NAME
	log_must zpool import -d /$TESTPOOL/ $POOL_NAME
	log_mustnot eval "zpool status $POOL_NAME \| grep -q 'Errata #3'"
	log_pass "Errata 3 is properly handled"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/Makefile.am b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/Makefile.am
	new file mode 100644
	index 000000000000..13e1c2dde31b
	--- /dev/null
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/Makefile.am
	@@ -0,0 +1,5 @@
	+pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/crtime
	+dist_pkgdata_SCRIPTS = \
	+ cleanup.ksh \
	+ setup.ksh \
	+ crtime_001_pos.ksh
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/cleanup.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/cleanup.ksh
	new file mode 100755
	index 000000000000..3166bd6ec16e
	--- /dev/null
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/cleanup.ksh
	@@ -0,0 +1,34 @@
	+#!/bin/ksh -p
	+#
	+# CDDL HEADER START
	+#
	+# The contents of this file are subject to the terms of the
	+# Common Development and Distribution License (the "License").
	+# You may not use this file except in compliance with the License.
	+#
	+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	+# or http://www.opensolaris.org/os/licensing.
	+# See the License for the specific language governing permissions
	+# and limitations under the License.
	+#
	+# When distributing Covered Code, include this CDDL HEADER in each
	+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	+# If applicable, add the following below this CDDL HEADER, with the
	+# fields enclosed by brackets "[]" replaced with your own identifying
	+# information: Portions Copyright [yyyy] [name of copyright owner]
	+#
	+# CDDL HEADER END
	+#
	+
	+#
	+# Copyright 2007 Sun Microsystems, Inc. All rights reserved.
	+# Use is subject to license terms.
	+#
	+
	+#
	+# Copyright (c) 2013 by Delphix. All rights reserved.
	+#
	+
	+. $STF_SUITE/include/libtest.shlib
	+
	+default_cleanup
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/crtime_001_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/crtime_001_pos.ksh
	new file mode 100755
	index 000000000000..4f9810553fa6
	--- /dev/null
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/crtime_001_pos.ksh
	@@ -0,0 +1,71 @@
	+#!/bin/ksh -p
	+#
	+# CDDL HEADER START
	+#
	+# The contents of this file are subject to the terms of the
	+# Common Development and Distribution License (the "License").
	+# You may not use this file except in compliance with the License.
	+#
	+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	+# or http://www.opensolaris.org/os/licensing.
	+# See the License for the specific language governing permissions
	+# and limitations under the License.
	+#
	+# When distributing Covered Code, include this CDDL HEADER in each
	+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	+# If applicable, add the following below this CDDL HEADER, with the
	+# fields enclosed by brackets "[]" replaced with your own identifying
	+# information: Portions Copyright [yyyy] [name of copyright owner]
	+#
	+# CDDL HEADER END
	+#
	+# Portions Copyright 2021 iXsystems, Inc.
	+#
	+
	+. $STF_SUITE/include/libtest.shlib
	+
	+#
	+# DESCRIPTION:
	+#
	+# Verify crtime is functional with xattr=on\|sa
	+
	+verify_runnable "both"
	+
	+#
	+# The statx system call was first added in the 4.11 Linux kernel. Prior to this
	+# change there was no mechanism to obtain birth time on Linux. Therefore, this
	+# test is expected to fail on older kernels and is skipped.
	+#
	+if is_linux; then
	+ if [[ $(linux_version) -lt $(linux_version "4.11") ]]; then
	+ log_unsupported "Requires statx(2) system call on Linux"
	+ fi
	+ typeset stat_version=$(stat --version \| awk '{ print $NF; exit }')
	+ if compare_version_gte "8.30" "${stat_version}"; then
	+ log_unsupported "Requires coreutils stat(1) > 8.30 on Linux"
	+ fi
	+fi
	+
	+log_assert "Verify crtime is functional."
	+
	+set -A args "sa" "on"
	+typeset TESTFILE=$TESTDIR/testfile
	+
	+for arg in ${args[*]}; do
	+ log_note "Testing with xattr set to $arg"
	+ log_must zfs set xattr=$arg $TESTPOOL
	+ rm -f $TESTFILE
	+ log_must touch $TESTFILE
	+ typeset -i crtime=$(stat_crtime $TESTFILE)
	+ typeset -i ctime=$(stat_ctime $TESTFILE)
	+ if (( crtime != ctime )); then
	+ log_fail "Incorrect crtime ($crtime != $ctime)"
	+ fi
	+ log_must touch $TESTFILE
	+ typeset -i crtime1=$(stat_crtime $TESTFILE)
	+ if (( crtime1 != crtime )); then
	+ log_fail "touch modified crtime ($crtime1 != $crtime)"
	+ fi
	+done
	+
	+log_pass "Verified crtime is functional."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/setup.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/setup.ksh
	new file mode 100755
	index 000000000000..fc5cec3063a6
	--- /dev/null
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/crtime/setup.ksh
	@@ -0,0 +1,35 @@
	+#!/bin/ksh -p
	+#
	+# CDDL HEADER START
	+#
	+# The contents of this file are subject to the terms of the
	+# Common Development and Distribution License (the "License").
	+# You may not use this file except in compliance with the License.
	+#
	+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	+# or http://www.opensolaris.org/os/licensing.
	+# See the License for the specific language governing permissions
	+# and limitations under the License.
	+#
	+# When distributing Covered Code, include this CDDL HEADER in each
	+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	+# If applicable, add the following below this CDDL HEADER, with the
	+# fields enclosed by brackets "[]" replaced with your own identifying
	+# information: Portions Copyright [yyyy] [name of copyright owner]
	+#
	+# CDDL HEADER END
	+#
	+
	+#
	+# Copyright 2007 Sun Microsystems, Inc. All rights reserved.
	+# Use is subject to license terms.
	+#
	+
	+#
	+# Copyright (c) 2013 by Delphix. All rights reserved.
	+#
	+
	+. $STF_SUITE/include/libtest.shlib
	+
	+DISK=${DISKS%% *}
	+default_setup $DISK
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/fault/Makefile.am b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/fault/Makefile.am
	index f2fc06877d3b..ba0d7d6992c6 100644
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/fault/Makefile.am
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/fault/Makefile.am
	@@ -1,19 +1,20 @@
	pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/fault
	dist_pkgdata_SCRIPTS = \
	setup.ksh \
	cleanup.ksh \
	auto_offline_001_pos.ksh \
	auto_online_001_pos.ksh \
	+ auto_online_002_pos.ksh \
	auto_replace_001_pos.ksh \
	auto_spare_001_pos.ksh \
	auto_spare_002_pos.ksh \
	auto_spare_ashift.ksh \
	auto_spare_multiple.ksh \
	auto_spare_shared.ksh \
	decrypt_fault.ksh \
	decompress_fault.ksh \
	scrub_after_resilver.ksh \
	zpool_status_-s.ksh

	dist_pkgdata_DATA = \
	fault.cfg
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/fault/auto_online_002_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/fault/auto_online_002_pos.ksh
	new file mode 100755
	index 000000000000..60185ace34bb
	--- /dev/null
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/fault/auto_online_002_pos.ksh
	@@ -0,0 +1,94 @@
	+#!/bin/ksh -p
	+#
	+# CDDL HEADER START
	+#
	+# The contents of this file are subject to the terms of the
	+# Common Development and Distribution License (the "License").
	+# You may not use this file except in compliance with the License.
	+#
	+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	+# or http://www.opensolaris.org/os/licensing.
	+# See the License for the specific language governing permissions
	+# and limitations under the License.
	+#
	+# When distributing Covered Code, include this CDDL HEADER in each
	+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	+# If applicable, add the following below this CDDL HEADER, with the
	+# fields enclosed by brackets "[]" replaced with your own identifying
	+# information: Portions Copyright [yyyy] [name of copyright owner]
	+#
	+# CDDL HEADER END
	+#
	+# Copyright (c) 2016, 2017 by Intel Corporation. All rights reserved.
	+# Copyright (c) 2019 by Delphix. All rights reserved.
	+# Portions Copyright 2021 iXsystems, Inc.
	+#
	+
	+. $STF_SUITE/include/libtest.shlib
	+. $STF_SUITE/tests/functional/fault/fault.cfg
	+
	+#
	+# DESCRIPTION:
	+# Testing Fault Management Agent ZED Logic - Automated Auto-Online Test.
	+# Now with partitioned vdevs.
	+#
	+# STRATEGY:
	+# 1. Partition a scsi_debug device for simulating removal
	+# 2. Create a pool
	+# 3. Offline disk
	+# 4. ZED polls for an event change for online disk to be automatically
	+# added back to the pool.
	+#
	+verify_runnable "both"
	+
	+function cleanup
	+{
	+ poolexists ${TESTPOOL} && destroy_pool ${TESTPOOL}
	+ unload_scsi_debug
	+}
	+
	+log_assert "Testing automated auto-online FMA test with partitioned vdev"
	+
	+log_onexit cleanup
	+
	+load_scsi_debug ${SDSIZE} ${SDHOSTS} ${SDTGTS} ${SDLUNS} '512b'
	+SDDEVICE=$(get_debug_device)
	+zpool labelclear -f ${SDDEVICE}
	+partition_disk ${SDSIZE} ${SDDEVICE} 1
	+part=${SDDEVICE}1
	+host=$(get_scsi_host ${SDDEVICE})
	+
	+block_device_wait /dev/${part}
	+log_must zpool create -f ${TESTPOOL} raidz1 ${part} ${DISKS}
	+
	+# Add some data to the pool
	+log_must mkfile ${FSIZE} /${TESTPOOL}/data
	+
	+remove_disk ${SDDEVICE}
	+check_state ${TESTPOOL} "" "degraded" \|\| \
	+ log_fail "${TESTPOOL} is not degraded"
	+
	+# Clear zpool events
	+log_must zpool events -c
	+
	+# Online disk
	+insert_disk ${SDDEVICE} ${host}
	+
	+log_note "Delay for ZED auto-online"
	+typeset -i timeout=0
	+until is_pool_resilvered ${TESTPOOL}; do
	+ if ((timeout++ == MAXTIMEOUT)); then
	+ log_fail "Timeout occurred"
	+ fi
	+ sleep 1
	+done
	+log_note "Auto-online of ${SDDEVICE} is complete"
	+
	+# Validate auto-online was successful
	+sleep 1
	+check_state ${TESTPOOL} "" "online" \|\| \
	+ log_fail "${TESTPOOL} is not back online"
	+
	+log_must zpool destroy ${TESTPOOL}
	+
	+log_pass "Auto-online with partitioned vdev test successful"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/Makefile.am b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/Makefile.am
	index 9baf580eeadb..09f4c1d0d74f 100644
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/Makefile.am
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/Makefile.am
	@@ -1,18 +1,15 @@
	pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/l2arc
	dist_pkgdata_SCRIPTS = \
	cleanup.ksh \
	setup.ksh \
	l2arc_arcstats_pos.ksh \
	l2arc_l2miss_pos.ksh \
	l2arc_mfuonly_pos.ksh \
	persist_l2arc_001_pos.ksh \
	persist_l2arc_002_pos.ksh \
	persist_l2arc_003_neg.ksh \
	persist_l2arc_004_pos.ksh \
	- persist_l2arc_005_pos.ksh \
	- persist_l2arc_006_pos.ksh \
	- persist_l2arc_007_pos.ksh \
	- persist_l2arc_008_pos.ksh
	+ persist_l2arc_005_pos.ksh

	dist_pkgdata_DATA = \
	l2arc.cfg
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/l2arc_arcstats_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/l2arc_arcstats_pos.ksh
	index 24fcefadfd07..3e76347b029a 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/l2arc_arcstats_pos.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/l2arc_arcstats_pos.ksh
	@@ -1,107 +1,106 @@
	#!/bin/ksh -p
	#
	# CDDL HEADER START
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#
	# CDDL HEADER END
	#

	#
	# Copyright (c) 2020, George Amanakis. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/functional/l2arc/l2arc.cfg

	#
	# DESCRIPTION:
	# L2ARC MFU/MRU arcstats do not leak
	#
	# STRATEGY:
	# 1. Create pool with a cache device.
	# 2. Create a random file in that pool, smaller than the cache device
	# and random read for 10 sec.
	# 3. Read l2arc_mfu_asize and l2arc_mru_asize
	# 4. Export pool.
	# 5. Verify l2arc_mfu_asize and l2arc_mru_asize are 0.
	# 6. Import pool.
	# 7. Read random read for 10 sec.
	# 8. Read l2arc_mfu_asize and l2arc_mru_asize
	# 9. Verify that L2ARC MFU increased and MFU+MRU = L2_asize.
	#

	verify_runnable "global"

	log_assert "L2ARC MFU/MRU arcstats do not leak."

	function cleanup
	{
	if poolexists $TESTPOOL ; then
	destroy_pool $TESTPOOL
	fi

	log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
	}
	log_onexit cleanup

	# L2ARC_NOPREFETCH is set to 0 to let L2ARC handle prefetches
	typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
	log_must set_tunable32 L2ARC_NOPREFETCH 0

	typeset fill_mb=800
	typeset cache_sz=$(( 1.4 * $fill_mb ))
	export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M

	log_must truncate -s ${cache_sz}M $VDEV_CACHE

	log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE

	log_must fio $FIO_SCRIPTS/mkfiles.fio
	log_must fio $FIO_SCRIPTS/random_reads.fio

	arcstat_quiescence_noecho l2_size
	log_must zpool offline $TESTPOOL $VDEV_CACHE
	arcstat_quiescence_noecho l2_size

	typeset l2_mfu_init=$(get_arcstat l2_mfu_asize)
	typeset l2_mru_init=$(get_arcstat l2_mru_asize)
	typeset l2_prefetch_init=$(get_arcstat l2_prefetch_asize)
	typeset l2_asize_init=$(get_arcstat l2_asize)

	log_must zpool online $TESTPOOL $VDEV_CACHE
	arcstat_quiescence_noecho l2_size
	log_must zpool export $TESTPOOL
	arcstat_quiescence_noecho l2_feeds

	log_must test $(get_arcstat l2_mfu_asize) -eq 0
	log_must test $(get_arcstat l2_mru_asize) -eq 0
	log_must zpool import -d $VDIR $TESTPOOL
	arcstat_quiescence_noecho l2_size

	log_must fio $FIO_SCRIPTS/random_reads.fio
	arcstat_quiescence_noecho l2_size
	log_must zpool offline $TESTPOOL $VDEV_CACHE
	arcstat_quiescence_noecho l2_size

	typeset l2_mfu_end=$(get_arcstat l2_mfu_asize)
	typeset l2_mru_end=$(get_arcstat l2_mru_asize)
	typeset l2_prefetch_end=$(get_arcstat l2_prefetch_asize)
	typeset l2_asize_end=$(get_arcstat l2_asize)

	-log_must test $(( $l2_mfu_end - $l2_mfu_init )) -gt 0
	log_must test $(( $l2_mru_end + $l2_mfu_end + $l2_prefetch_end - \
	$l2_asize_end )) -eq 0
	log_must test $(( $l2_mru_init + $l2_mfu_init + $l2_prefetch_init - \
	$l2_asize_init )) -eq 0

	log_must zpool destroy -f $TESTPOOL

	log_pass "L2ARC MFU/MRU arcstats do not leak."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_004_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_004_pos.ksh
	index 544e9291de29..b40703180687 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_004_pos.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_004_pos.ksh
	@@ -1,102 +1,101 @@
	#!/bin/ksh -p
	#
	# CDDL HEADER START
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#
	# CDDL HEADER END
	#

	#
	# Copyright (c) 2020, George Amanakis. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/functional/l2arc/l2arc.cfg

	#
	# DESCRIPTION:
	-# Persistent L2ARC restores all written log blocks
	+# Off/onlining an L2ARC device results in rebuilding L2ARC, vdev not
	+# present.
	#
	# STRATEGY:
	# 1. Create pool with a cache device.
	-# 2. Create a random file in that pool, smaller than the cache device
	-# and random read for 10 sec.
	-# 3. Export pool.
	-# 4. Read amount of log blocks written.
	-# 5. Import pool.
	-# 6. Read amount of log blocks built.
	-# 7. Compare the two amounts.
	-# 8. Read the file written in (2) and check if l2_hits in
	-# /proc/spl/kstat/zfs/arcstats increased.
	-# 9. Check if the labels of the L2ARC device are intact.
	+# 2. Create a random file in that pool and random read for 10 sec.
	+# 3. Read the amount of log blocks written from the header of the
	+# L2ARC device.
	+# 4. Offline the L2ARC device and export pool.
	+# 5. Import pool and online the L2ARC device.
	+# 6. Read the amount of log blocks rebuilt in arcstats and compare to
	+# (3).
	+# 7. Check if the labels of the L2ARC device are intact.
	#

	verify_runnable "global"

	-log_assert "Persistent L2ARC restores all written log blocks."
	+log_assert "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev not present."

	function cleanup
	{
	if poolexists $TESTPOOL ; then
	destroy_pool $TESTPOOL
	fi

	log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
	+ log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE \
	+ $rebuild_blocks_min_l2size
	}
	log_onexit cleanup

	# L2ARC_NOPREFETCH is set to 0 to let L2ARC handle prefetches
	typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
	+typeset rebuild_blocks_min_l2size=$(get_tunable L2ARC_REBUILD_BLOCKS_MIN_L2SIZE)
	log_must set_tunable32 L2ARC_NOPREFETCH 0
	+log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE 0

	typeset fill_mb=800
	-typeset cache_sz=$(( 2 * $fill_mb ))
	+typeset cache_sz=$(( floor($fill_mb / 2) ))
	export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M

	log_must truncate -s ${cache_sz}M $VDEV_CACHE

	-typeset log_blk_start=$(get_arcstat l2_log_blk_writes)
	-
	log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE

	log_must fio $FIO_SCRIPTS/mkfiles.fio
	log_must fio $FIO_SCRIPTS/random_reads.fio

	+arcstat_quiescence_noecho l2_size
	+log_must zpool offline $TESTPOOL $VDEV_CACHE
	arcstat_quiescence_noecho l2_size
	log_must zpool export $TESTPOOL
	arcstat_quiescence_noecho l2_feeds

	-typeset log_blk_end=$(get_arcstat l2_log_blk_writes)
	-typeset log_blk_rebuild_start=$(get_arcstat l2_rebuild_log_blks)
	+typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
	+typeset l2_dh_log_blk=$(zdb -l $VDEV_CACHE \| grep log_blk_count \| \
	+ awk '{print $2}')

	log_must zpool import -d $VDIR $TESTPOOL
	-
	-typeset l2_hits_start=$(get_arcstat l2_hits)
	-
	-log_must fio $FIO_SCRIPTS/random_reads.fio
	+log_must zpool online $TESTPOOL $VDEV_CACHE
	arcstat_quiescence_noecho l2_size

	-typeset log_blk_rebuild_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
	-typeset l2_hits_end=$(get_arcstat l2_hits)
	-
	-log_must test $(( $log_blk_rebuild_end - $log_blk_rebuild_start )) -eq \
	- $(( $log_blk_end - $log_blk_start ))
	+typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)

	-log_must test $l2_hits_end -gt $l2_hits_start
	+log_must test $l2_dh_log_blk -eq $(( $l2_rebuild_log_blk_end - \
	+ $l2_rebuild_log_blk_start ))
	+log_must test $l2_dh_log_blk -gt 0

	log_must zpool offline $TESTPOOL $VDEV_CACHE
	arcstat_quiescence_noecho l2_size

	log_must zdb -lq $VDEV_CACHE

	log_must zpool destroy -f $TESTPOOL

	-log_pass "Persistent L2ARC restores all written log blocks."
	+log_pass "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev not present."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_005_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_005_pos.ksh
	index ee46e7b8cad6..8ad648519f5c 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_005_pos.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_005_pos.ksh
	@@ -1,109 +1,102 @@
	#!/bin/ksh -p
	#
	# CDDL HEADER START
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#
	# CDDL HEADER END
	#

	#
	# Copyright (c) 2020, George Amanakis. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/functional/l2arc/l2arc.cfg
	-. $STF_SUITE/tests/functional/cli_root/zfs_load-key/zfs_load-key_common.kshlib

	#
	# DESCRIPTION:
	-# Persistent L2ARC restores all written log blocks with encryption
	+# Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present.
	#
	# STRATEGY:
	# 1. Create pool with a cache device.
	-# 2. Create a an encrypted ZFS file system.
	-# 3. Create a random file in the entrypted file system,
	-# smaller than the cache device, and random read for 10 sec.
	-# 4. Export pool.
	-# 5. Read amount of log blocks written.
	-# 6. Import pool.
	-# 7. Mount the encrypted ZFS file system.
	-# 8. Read amount of log blocks built.
	-# 9. Compare the two amounts.
	-# 10. Read the file written in (3) and check if l2_hits in
	-# /proc/spl/kstat/zfs/arcstats increased.
	-# 11. Check if the labels of the L2ARC device are intact.
	+# 2. Create a random file in that pool and random read for 10 sec.
	+# 3. Offline the L2ARC device.
	+# 4. Read the amount of log blocks written from the header of the
	+# L2ARC device.
	+# 5. Online the L2ARC device.
	+# 6. Read the amount of log blocks rebuilt in arcstats and compare to
	+# (4).
	+# 7. Check if the labels of the L2ARC device are intact.
	#

	verify_runnable "global"

	-log_assert "Persistent L2ARC restores all written log blocks with encryption."
	+log_assert "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present."

	function cleanup
	{
	if poolexists $TESTPOOL ; then
	destroy_pool $TESTPOOL
	fi

	log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
	+ log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE \
	+ $rebuild_blocks_min_l2size
	}
	log_onexit cleanup

	# L2ARC_NOPREFETCH is set to 0 to let L2ARC handle prefetches
	typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
	+typeset rebuild_blocks_min_l2size=$(get_tunable L2ARC_REBUILD_BLOCKS_MIN_L2SIZE)
	log_must set_tunable32 L2ARC_NOPREFETCH 0
	+log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE 0

	typeset fill_mb=800
	-typeset cache_sz=$(( 2 * $fill_mb ))
	+typeset cache_sz=$(( floor($fill_mb / 2) ))
	export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M

	log_must truncate -s ${cache_sz}M $VDEV_CACHE

	-typeset log_blk_start=$(get_arcstat l2_log_blk_writes)
	-
	log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE

	-log_must eval "echo $PASSPHRASE \| zfs create -o encryption=on" \
	- "-o keyformat=passphrase $TESTPOOL/$TESTFS1"
	-
	log_must fio $FIO_SCRIPTS/mkfiles.fio
	log_must fio $FIO_SCRIPTS/random_reads.fio

	arcstat_quiescence_noecho l2_size
	-log_must zpool export $TESTPOOL
	-arcstat_quiescence_noecho l2_feeds
	-
	-typeset log_blk_end=$(get_arcstat l2_log_blk_writes)
	-typeset log_blk_rebuild_start=$(get_arcstat l2_rebuild_log_blks)
	-
	-log_must zpool import -d $VDIR $TESTPOOL
	-log_must eval "echo $PASSPHRASE \| zfs mount -l $TESTPOOL/$TESTFS1"
	+log_must zpool offline $TESTPOOL $VDEV_CACHE
	+arcstat_quiescence_noecho l2_size

	-typeset l2_hits_start=$(get_arcstat l2_hits)
	+typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
	+typeset l2_dh_log_blk=$(zdb -l $VDEV_CACHE \| grep log_blk_count \| \
	+ awk '{print $2}')

	-log_must fio $FIO_SCRIPTS/random_reads.fio
	+log_must zpool online $TESTPOOL $VDEV_CACHE
	arcstat_quiescence_noecho l2_size

	-typeset log_blk_rebuild_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
	-typeset l2_hits_end=$(get_arcstat l2_hits)
	-
	-log_must test $(( $log_blk_rebuild_end - $log_blk_rebuild_start )) -eq \
	- $(( $log_blk_end - $log_blk_start ))
	+typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)

	-log_must test $l2_hits_end -gt $l2_hits_start
	+# Upon onlining the cache device we might write additional blocks to it
	+# before it is marked for rebuild as the l2ad_* parameters are not cleared
	+# when offlining the device. See comment in l2arc_rebuild_vdev().
	+# So we cannot compare the amount of rebuilt log blocks to the amount of log
	+# blocks read from the header of the device.
	+log_must test $(( $l2_rebuild_log_blk_end - \
	+ $l2_rebuild_log_blk_start )) -gt 0
	+log_must test $l2_dh_log_blk -gt 0

	log_must zpool offline $TESTPOOL $VDEV_CACHE
	arcstat_quiescence_noecho l2_size

	log_must zdb -lq $VDEV_CACHE

	log_must zpool destroy -f $TESTPOOL

	-log_pass "Persistent L2ARC restores all written log blocks with encryption."
	+log_pass "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_006_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_006_pos.ksh
	deleted file mode 100755
	index 051773540233..000000000000
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_006_pos.ksh
	+++ /dev/null
	@@ -1,101 +0,0 @@
	-#!/bin/ksh -p
	-#
	-# CDDL HEADER START
	-#
	-# This file and its contents are supplied under the terms of the
	-# Common Development and Distribution License ("CDDL"), version 1.0.
	-# You may only use this file in accordance with the terms of version
	-# 1.0 of the CDDL.
	-#
	-# A full copy of the text of the CDDL should have accompanied this
	-# source. A copy of the CDDL is also available via the Internet at
	-# http://www.illumos.org/license/CDDL.
	-#
	-# CDDL HEADER END
	-#
	-
	-#
	-# Copyright (c) 2020, George Amanakis. All rights reserved.
	-#
	-
	-. $STF_SUITE/include/libtest.shlib
	-. $STF_SUITE/tests/functional/l2arc/l2arc.cfg
	-
	-#
	-# DESCRIPTION:
	-# Off/onlining an L2ARC device results in rebuilding L2ARC, vdev not
	-# present.
	-#
	-# STRATEGY:
	-# 1. Create pool with a cache device.
	-# 2. Create a random file in that pool and random read for 10 sec.
	-# 3. Read the amount of log blocks written from the header of the
	-# L2ARC device.
	-# 4. Offline the L2ARC device and export pool.
	-# 5. Import pool and online the L2ARC device.
	-# 6. Read the amount of log blocks rebuilt in arcstats and compare to
	-# (3).
	-# 7. Check if the labels of the L2ARC device are intact.
	-#
	-
	-verify_runnable "global"
	-
	-log_assert "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev not present."
	-
	-function cleanup
	-{
	- if poolexists $TESTPOOL ; then
	- destroy_pool $TESTPOOL
	- fi
	-
	- log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
	- log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE \
	- $rebuild_blocks_min_l2size
	-}
	-log_onexit cleanup
	-
	-# L2ARC_NOPREFETCH is set to 0 to let L2ARC handle prefetches
	-typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
	-typeset rebuild_blocks_min_l2size=$(get_tunable L2ARC_REBUILD_BLOCKS_MIN_L2SIZE)
	-log_must set_tunable32 L2ARC_NOPREFETCH 0
	-log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE 0
	-
	-typeset fill_mb=800
	-typeset cache_sz=$(( floor($fill_mb / 2) ))
	-export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
	-
	-log_must truncate -s ${cache_sz}M $VDEV_CACHE
	-
	-log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
	-
	-log_must fio $FIO_SCRIPTS/mkfiles.fio
	-log_must fio $FIO_SCRIPTS/random_reads.fio
	-
	-arcstat_quiescence_noecho l2_size
	-log_must zpool offline $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-log_must zpool export $TESTPOOL
	-arcstat_quiescence_noecho l2_feeds
	-
	-typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
	-typeset l2_dh_log_blk=$(zdb -l $VDEV_CACHE \| grep log_blk_count \| \
	- awk '{print $2}')
	-
	-log_must zpool import -d $VDIR $TESTPOOL
	-log_must zpool online $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
	-
	-log_must test $l2_dh_log_blk -eq $(( $l2_rebuild_log_blk_end - \
	- $l2_rebuild_log_blk_start ))
	-log_must test $l2_dh_log_blk -gt 0
	-
	-log must zpool offline $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-log_must zdb -lq $VDEV_CACHE
	-
	-log_must zpool destroy -f $TESTPOOL
	-
	-log_pass "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev not present."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_007_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_007_pos.ksh
	deleted file mode 100755
	index 9208b81d4905..000000000000
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_007_pos.ksh
	+++ /dev/null
	@@ -1,97 +0,0 @@
	-#!/bin/ksh -p
	-#
	-# CDDL HEADER START
	-#
	-# This file and its contents are supplied under the terms of the
	-# Common Development and Distribution License ("CDDL"), version 1.0.
	-# You may only use this file in accordance with the terms of version
	-# 1.0 of the CDDL.
	-#
	-# A full copy of the text of the CDDL should have accompanied this
	-# source. A copy of the CDDL is also available via the Internet at
	-# http://www.illumos.org/license/CDDL.
	-#
	-# CDDL HEADER END
	-#
	-
	-#
	-# Copyright (c) 2020, George Amanakis. All rights reserved.
	-#
	-
	-. $STF_SUITE/include/libtest.shlib
	-. $STF_SUITE/tests/functional/l2arc/l2arc.cfg
	-
	-#
	-# DESCRIPTION:
	-# Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present.
	-#
	-# STRATEGY:
	-# 1. Create pool with a cache device.
	-# 2. Create a random file in that pool and random read for 10 sec.
	-# 3. Offline the L2ARC device.
	-# 4. Read the amount of log blocks written from the header of the
	-# L2ARC device.
	-# 5. Online the L2ARC device.
	-# 6. Read the amount of log blocks rebuilt in arcstats and compare to
	-# (4).
	-# 7. Check if the labels of the L2ARC device are intact.
	-#
	-
	-verify_runnable "global"
	-
	-log_assert "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present."
	-
	-function cleanup
	-{
	- if poolexists $TESTPOOL ; then
	- destroy_pool $TESTPOOL
	- fi
	-
	- log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
	- log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE \
	- $rebuild_blocks_min_l2size
	-}
	-log_onexit cleanup
	-
	-# L2ARC_NOPREFETCH is set to 0 to let L2ARC handle prefetches
	-typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
	-typeset rebuild_blocks_min_l2size=$(get_tunable L2ARC_REBUILD_BLOCKS_MIN_L2SIZE)
	-log_must set_tunable32 L2ARC_NOPREFETCH 0
	-log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE 0
	-
	-typeset fill_mb=800
	-typeset cache_sz=$(( floor($fill_mb / 2) ))
	-export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
	-
	-log_must truncate -s ${cache_sz}M $VDEV_CACHE
	-
	-log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
	-
	-log_must fio $FIO_SCRIPTS/mkfiles.fio
	-log_must fio $FIO_SCRIPTS/random_reads.fio
	-
	-arcstat_quiescence_noecho l2_size
	-log_must zpool offline $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
	-typeset l2_dh_log_blk=$(zdb -l $VDEV_CACHE \| grep log_blk_count \| \
	- awk '{print $2}')
	-
	-log_must zpool online $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
	-
	-log_must test $l2_dh_log_blk -eq $(( $l2_rebuild_log_blk_end - \
	- $l2_rebuild_log_blk_start ))
	-log_must test $l2_dh_log_blk -gt 0
	-
	-log_must zpool offline $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-log_must zdb -lq $VDEV_CACHE
	-
	-log_must zpool destroy -f $TESTPOOL
	-
	-log_pass "Off/onlining an L2ARC device results in rebuilding L2ARC, vdev present."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_008_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_008_pos.ksh
	deleted file mode 100755
	index 5a79ff31ba7e..000000000000
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_008_pos.ksh
	+++ /dev/null
	@@ -1,143 +0,0 @@
	-#!/bin/ksh -p
	-#
	-# CDDL HEADER START
	-#
	-# This file and its contents are supplied under the terms of the
	-# Common Development and Distribution License ("CDDL"), version 1.0.
	-# You may only use this file in accordance with the terms of version
	-# 1.0 of the CDDL.
	-#
	-# A full copy of the text of the CDDL should have accompanied this
	-# source. A copy of the CDDL is also available via the Internet at
	-# http://www.illumos.org/license/CDDL.
	-#
	-# CDDL HEADER END
	-#
	-
	-#
	-# Copyright (c) 2020, George Amanakis. All rights reserved.
	-#
	-
	-. $STF_SUITE/include/libtest.shlib
	-. $STF_SUITE/tests/functional/l2arc/l2arc.cfg
	-
	-#
	-# DESCRIPTION:
	-# Off/onlining an L2ARC device restores all written blocks, vdev present.
	-#
	-# STRATEGY:
	-# 1. Create pool with a cache device.
	-# 2. Create a random file in that pool and random read for 10 sec.
	-# 3. Read the amount of log blocks written from the header of the
	-# L2ARC device.
	-# 4. Offline the L2ARC device.
	-# 5. Online the L2ARC device.
	-# 6. Read the amount of log blocks rebuilt in arcstats and compare to
	-# (3).
	-# 7. Create another random file in that pool and random read for 10 sec.
	-# 8. Read the amount of log blocks written from the header of the
	-# L2ARC device.
	-# 9. Offline the L2ARC device.
	-# 10. Online the L2ARC device.
	-# 11. Read the amount of log blocks rebuilt in arcstats and compare to
	-# (8).
	-# 12. Check if the amount of log blocks on the cache device has
	-# increased.
	-# 13. Export the pool.
	-# 14. Read the amount of log blocks on the cache device.
	-# 15. Import the pool.
	-# 16. Read the amount of log blocks rebuilt in arcstats and compare to
	-# (14).
	-# 17. Check if the labels of the L2ARC device are intact.
	-#
	-
	-verify_runnable "global"
	-
	-log_assert "Off/onlining an L2ARC device restores all written blocks , vdev present."
	-
	-function cleanup
	-{
	- if poolexists $TESTPOOL ; then
	- destroy_pool $TESTPOOL
	- fi
	-
	- log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
	-}
	-log_onexit cleanup
	-
	-# L2ARC_NOPREFETCH is set to 0 to let L2ARC handle prefetches
	-typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
	-log_must set_tunable32 L2ARC_NOPREFETCH 0
	-
	-typeset fill_mb=400
	-typeset cache_sz=$(( 3 * $fill_mb ))
	-export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
	-
	-log_must truncate -s ${cache_sz}M $VDEV_CACHE
	-
	-log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
	-
	-log_must fio $FIO_SCRIPTS/mkfiles.fio
	-log_must fio $FIO_SCRIPTS/random_reads.fio
	-
	-arcstat_quiescence_noecho l2_size
	-log_must zpool offline $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-typeset l2_dh_log_blk1=$(zdb -l $VDEV_CACHE \| grep log_blk_count \| \
	- awk '{print $2}')
	-typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
	-
	-log_must zpool online $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
	-
	-log_must test $l2_dh_log_blk1 -eq $(( $l2_rebuild_log_blk_end - \
	- $l2_rebuild_log_blk_start ))
	-log_must test $l2_dh_log_blk1 -gt 0
	-
	-log_must fio $FIO_SCRIPTS/mkfiles.fio
	-log_must fio $FIO_SCRIPTS/random_reads.fio
	-
	-arcstat_quiescence_noecho l2_size
	-log_must zpool offline $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-typeset l2_dh_log_blk2=$(zdb -l $VDEV_CACHE \| grep log_blk_count \| \
	- awk '{print $2}')
	-typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
	-
	-log_must zpool online $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
	-
	-log_must test $l2_dh_log_blk2 -eq $(( $l2_rebuild_log_blk_end - \
	- $l2_rebuild_log_blk_start ))
	-log_must test $l2_dh_log_blk2 -gt $l2_dh_log_blk1
	-
	-log_must zpool export $TESTPOOL
	-arcstat_quiescence_noecho l2_feeds
	-
	-typeset l2_dh_log_blk3=$(zdb -l $VDEV_CACHE \| grep log_blk_count \| \
	- awk '{print $2}')
	-typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
	-
	-log_must zpool import -d $VDIR $TESTPOOL
	-arcstat_quiescence_noecho l2_size
	-
	-typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
	-
	-log_must test $l2_dh_log_blk3 -eq $(( $l2_rebuild_log_blk_end - \
	- $l2_rebuild_log_blk_start ))
	-log_must test $l2_dh_log_blk3 -gt 0
	-
	-log must zpool offline $TESTPOOL $VDEV_CACHE
	-arcstat_quiescence_noecho l2_size
	-
	-log_must zdb -lq $VDEV_CACHE
	-
	-log_must zpool destroy -f $TESTPOOL
	-
	-log_pass "Off/onlining an L2ARC device restores all written blocks, vdev present."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redacted_send/redacted_panic.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redacted_send/redacted_panic.ksh
	index bf3b17f35804..032d1fb91a2e 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redacted_send/redacted_panic.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/redacted_send/redacted_panic.ksh
	@@ -1,44 +1,50 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	# Copyright (c) 2021 by Delphix. All rights reserved.
	#

	. $STF_SUITE/tests/functional/redacted_send/redacted.kshlib

	#
	# Description:
	# Verify edge case when midbufid is equal to minbufid for the bug fixed by
	# https://github.com/openzfs/zfs/pull/11297 (Fix kernel panic induced by
	# redacted send)
	#

	typeset ds_name="panic"
	typeset sendfs="$POOL/$ds_name"
	typeset recvfs="$POOL2/$ds_name"
	typeset clone="$POOL/${ds_name}_clone"
	-typeset stream=$(mktemp $tmpdir/stream.XXXX)
	+typeset stream=$(mktemp $TEST_BASE_DIR/stream.XXXX)

	-log_onexit redacted_cleanup $sendfs $recvfs
	+function cleanup
	+{
	+ redacted_cleanup $sendfs $recvfs
	+ rm -f $stream
	+}
	+
	+log_onexit cleanup

	log_must zfs create -o recsize=8k $sendfs
	log_must dd if=/dev/urandom of=/$sendfs/file bs=1024k count=2048
	log_must zfs snapshot $sendfs@init
	log_must zfs clone $sendfs@init $clone
	log_must stride_dd -i /dev/urandom -o /$clone/file -b 8192 -s 2 -c 7226
	log_must zfs snapshot $clone@init
	log_must zfs redact $sendfs@init book_init $clone@init
	log_must eval "zfs send --redact $sendfs#book_init $sendfs@init >$stream"
	log_must eval "zfs recv $recvfs <$stream"
	log_pass
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/rsend/recv_dedup_encrypted_zvol.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/rsend/recv_dedup_encrypted_zvol.ksh
	index 569fcd893e7d..daf559d264d9 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/rsend/recv_dedup_encrypted_zvol.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/rsend/recv_dedup_encrypted_zvol.ksh
	@@ -1,60 +1,60 @@
	#!/bin/ksh -p
	#
	# CDDL HEADER START
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#
	# CDDL HEADER END
	#

	#
	# Copyright (c) 2020 by Delphix. All rights reserved.
	#

	. $STF_SUITE/tests/functional/rsend/rsend.kshlib

	#
	# DESCRIPTION:
	# Verifies that we can receive a dedup send stream of a zvol by processing it
	# with "zstream redup".
	#

	verify_runnable "both"

	function cleanup
	{
	destroy_dataset $TESTPOOL/recv "-r"
	rm $sendfile
	rm $volfile
	rm $keyfile
	}
	log_onexit cleanup

	log_assert "Verify zfs can receive raw, recursive, and deduplicated send streams"

	typeset keyfile=/$TESTPOOL/pkey
	typeset recvdev=$ZVOL_DEVDIR/$TESTPOOL/recv
	typeset sendfile_compressed=$STF_SUITE/tests/functional/rsend/dedup_encrypted_zvol.zsend.bz2
	typeset sendfile=/$TESTPOOL/dedup_encrypted_zvol.zsend
	typeset volfile_compressed=$STF_SUITE/tests/functional/rsend/dedup_encrypted_zvol.bz2
	typeset volfile=/$TESTPOOL/dedup_encrypted_zvol

	log_must eval "echo 'password' > $keyfile"

	log_must eval "bzcat <$sendfile_compressed >$sendfile"
	log_must eval "zstream redup $sendfile \| zfs recv $TESTPOOL/recv"

	log_must zfs load-key $TESTPOOL/recv
	-block_device_wait
	+block_device_wait $volfile

	log_must eval "bzcat <$volfile_compressed >$volfile"
	log_must diff $volfile $recvdev

	log_pass "zfs can receive raw, recursive, and deduplicated send streams"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/rsend/send-c_stream_size_estimate.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/rsend/send-c_stream_size_estimate.ksh
	index 840b5f085967..b3edb1c45788 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/rsend/send-c_stream_size_estimate.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/rsend/send-c_stream_size_estimate.ksh
	@@ -1,97 +1,97 @@
	#!/bin/ksh -p

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	# Copyright (c) 2015, Delphix. All rights reserved.
	#

	. $STF_SUITE/tests/functional/rsend/rsend.kshlib
	. $STF_SUITE/include/properties.shlib

	#
	# Description:
	# Verify the stream size estimate given by -P accounts for compressed send.
	# Verify the stream size given by -P accounts for compressed send."
	#
	# Strategy:
	# 1. For datasets of varied compression types do the following:
	# 2. Write data, verify stream size estimates with and without -c
	#

	verify_runnable "both"
	typeset send_ds="$POOL2/testfs"
	typeset send_vol="$POOL2/vol"
	typeset send_voldev="$ZVOL_DEVDIR/$POOL2/vol"
	typeset file="$BACKDIR/file.0"
	typeset megs="16"
	typeset compress

	function get_estimated_size
	{
	typeset cmd=$1
	typeset ds=${cmd##* }
	if is_freebsd; then
	mkdir -p $BACKDIR
	typeset tmpfile=$(TMPDIR=$BACKDIR mktemp)
	else
	typeset tmpfile=$(mktemp -p $BACKDIR)
	fi

	eval "$cmd >$tmpfile"
	[[ $? -eq 0 ]] \|\| log_fail "get_estimated_size: $cmd"
	typeset size=$(eval "awk '\$2 == \"$ds\" {print \$3}' $tmpfile")
	rm -f $tmpfile

	echo $size
	}

	log_assert "Verify the stream size given by -P accounts for compressed send."
	log_onexit cleanup_pool $POOL2

	write_compressible $BACKDIR ${megs}m

	for compress in "${compress_prop_vals[@]}"; do
	datasetexists $send_ds && log_must_busy zfs destroy -r $send_ds
	datasetexists $send_vol && log_must_busy zfs destroy -r $send_vol
	log_must zfs create -o compress=$compress $send_ds
	log_must zfs create -V 1g -o compress=$compress $send_vol
	- block_device_wait
	+ block_device_wait $send_voldev

	typeset dir=$(get_prop mountpoint $send_ds)
	log_must cp $file $dir
	log_must zfs snapshot $send_ds@snap
	log_must dd if=$file of=$send_voldev
	log_must zfs snapshot $send_vol@snap

	typeset ds_size=$(get_estimated_size "zfs send -nP $send_ds@snap")
	typeset ds_lrefer=$(get_prop lrefer $send_ds)
	within_percent $ds_size $ds_lrefer 90 \|\| log_fail \
	"$ds_size and $ds_lrefer differed by too much"

	typeset vol_size=$(get_estimated_size "zfs send -nP $send_vol@snap")
	typeset vol_lrefer=$(get_prop lrefer $send_vol)
	within_percent $vol_size $vol_lrefer 90 \|\| log_fail \
	"$vol_size and $vol_lrefer differed by too much"

	typeset ds_csize=$(get_estimated_size "zfs send -nP -c $send_ds@snap")
	typeset ds_refer=$(get_prop refer $send_ds)
	within_percent $ds_csize $ds_refer 90 \|\| log_fail \
	"$ds_csize and $ds_refer differed by too much"

	typeset vol_csize=$(get_estimated_size "zfs send -nP -c $send_vol@snap")
	typeset vol_refer=$(get_prop refer $send_vol)
	within_percent $vol_csize $vol_refer 90 \|\| log_fail \
	"$vol_csize and $vol_refer differed by too much"
	done

	log_pass "The stream size given by -P accounts for compressed send."
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_volmode.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_volmode.ksh
	index 7451bf8b7a73..322a31e07d89 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_volmode.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/zvol/zvol_misc/zvol_misc_volmode.ksh
	@@ -1,242 +1,244 @@
	#!/bin/ksh -p
	#
	# CDDL HEADER START
	#
	# The contents of this file are subject to the terms of the
	# Common Development and Distribution License (the "License").
	# You may not use this file except in compliance with the License.
	#
	# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	# or http://www.opensolaris.org/os/licensing.
	# See the License for the specific language governing permissions
	# and limitations under the License.
	#
	# When distributing Covered Code, include this CDDL HEADER in each
	# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	# If applicable, add the following below this CDDL HEADER, with the
	# fields enclosed by brackets "[]" replaced with your own identifying
	# information: Portions Copyright [yyyy] [name of copyright owner]
	#
	# CDDL HEADER END
	#

	#
	# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/functional/cli_root/zfs_set/zfs_set_common.kshlib
	. $STF_SUITE/tests/functional/zvol/zvol_common.shlib
	. $STF_SUITE/tests/functional/zvol/zvol_misc/zvol_misc_common.kshlib

	#
	# DESCRIPTION:
	# Verify that ZFS volume property "volmode" works as intended.
	#
	# STRATEGY:
	# 1. Verify "volmode" property does not accept invalid values
	# 2. Verify "volmode=none" hides ZVOL device nodes
	# 3. Verify "volmode=full" exposes a fully functional device
	# 4. Verify "volmode=dev" hides partition info on the device
	# 5. Verify "volmode=default" behaves accordingly to "volmode" module parameter
	# 6. Verify "volmode" property is inherited correctly
	# 7. Verify "volmode" behaves correctly at import time
	# 8. Verify "volmode" behaves accordingly to zvol_inhibit_dev (Linux only)
	#
	# NOTE: changing volmode may need to remove minors, which could be open, so call
	# udev_wait() before we "zfs set volmode=<value>".

	verify_runnable "global"

	function cleanup
	{
	datasetexists $VOLFS && log_must_busy zfs destroy -r $VOLFS
	datasetexists $ZVOL && log_must_busy zfs destroy -r $ZVOL
	log_must zfs inherit volmode $TESTPOOL
	udev_wait
	sysctl_inhibit_dev 0
	sysctl_volmode 1
	udev_cleanup
	}

	#
	# Set zvol_inhibit_dev tunable to $value
	#
	function sysctl_inhibit_dev # value
	{
	typeset value="$1"

	if is_linux; then
	log_note "Setting zvol_inhibit_dev tunable to $value"
	log_must set_tunable32 VOL_INHIBIT_DEV $value
	fi
	}

	#
	# Set volmode tunable to $value
	#
	function sysctl_volmode # value
	{
	typeset value="$1"

	log_note "Setting volmode tunable to $value"
	log_must set_tunable32 VOL_MODE $value
	}

	#
	# Exercise open and close, read and write operations
	#
	function test_io # dev
	{
	typeset dev=$1

	log_must dd if=/dev/zero of=$dev count=1
	log_must dd if=$dev of=/dev/null count=1
	}

	log_assert "Verify that ZFS volume property 'volmode' works as intended"
	log_onexit cleanup

	VOLFS="$TESTPOOL/volfs"
	ZVOL="$TESTPOOL/vol"
	ZDEV="${ZVOL_DEVDIR}/$ZVOL"
	SUBZVOL="$VOLFS/subvol"
	SUBZDEV="${ZVOL_DEVDIR}/$SUBZVOL"

	log_must zfs create -o mountpoint=none $VOLFS
	log_must zfs create -V $VOLSIZE -s $SUBZVOL
	log_must zfs create -V $VOLSIZE -s $ZVOL
	udev_wait
	+blockdev_exists $ZDEV
	+blockdev_exists $SUBZDEV
	test_io $ZDEV
	test_io $SUBZDEV

	# 1. Verify "volmode" property does not accept invalid values
	typeset badvals=("off" "on" "1" "nope" "-")
	for badval in ${badvals[@]}
	do
	log_mustnot zfs set volmode="$badval" $ZVOL
	done

	# 2. Verify "volmode=none" hides ZVOL device nodes
	log_must zfs set volmode=none $ZVOL
	blockdev_missing $ZDEV
	log_must_busy zfs destroy $ZVOL

	# 3. Verify "volmode=full" exposes a fully functional device
	log_must zfs create -V $VOLSIZE -s $ZVOL
	udev_wait
	log_must zfs set volmode=full $ZVOL
	blockdev_exists $ZDEV
	test_io $ZDEV
	log_must verify_partition $ZDEV
	udev_wait
	# 3.1 Verify "volmode=geom" is an alias for "volmode=full"
	log_must zfs set volmode=geom $ZVOL
	blockdev_exists $ZDEV
	if [[ "$(get_prop 'volmode' $ZVOL)" != "full" ]]; then
	log_fail " Volmode value 'geom' is not an alias for 'full'"
	fi
	udev_wait
	log_must_busy zfs destroy $ZVOL

	# 4. Verify "volmode=dev" hides partition info on the device
	log_must zfs create -V $VOLSIZE -s $ZVOL
	udev_wait
	log_must zfs set volmode=dev $ZVOL
	blockdev_exists $ZDEV
	test_io $ZDEV
	log_mustnot verify_partition $ZDEV
	udev_wait
	log_must_busy zfs destroy $ZVOL

	# 5. Verify "volmode=default" behaves accordingly to "volmode" module parameter
	# 5.1 Verify sysctl "volmode=full"
	sysctl_volmode 1
	log_must zfs create -V $VOLSIZE -s $ZVOL
	udev_wait
	log_must zfs set volmode=default $ZVOL
	blockdev_exists $ZDEV
	log_must verify_partition $ZDEV
	udev_wait
	log_must_busy zfs destroy $ZVOL
	# 5.2 Verify sysctl "volmode=dev"
	sysctl_volmode 2
	log_must zfs create -V $VOLSIZE -s $ZVOL
	udev_wait
	log_must zfs set volmode=default $ZVOL
	blockdev_exists $ZDEV
	log_mustnot verify_partition $ZDEV
	udev_wait
	log_must_busy zfs destroy $ZVOL
	# 5.2 Verify sysctl "volmode=none"
	sysctl_volmode 3
	log_must zfs create -V $VOLSIZE -s $ZVOL
	udev_wait
	log_must zfs set volmode=default $ZVOL
	blockdev_missing $ZDEV

	# 6. Verify "volmode" property is inherited correctly
	log_must zfs inherit volmode $ZVOL
	# 6.1 Check volmode=full case
	log_must zfs set volmode=full $TESTPOOL
	verify_inherited 'volmode' 'full' $ZVOL $TESTPOOL
	blockdev_exists $ZDEV
	# 6.2 Check volmode=none case
	log_must zfs set volmode=none $TESTPOOL
	verify_inherited 'volmode' 'none' $ZVOL $TESTPOOL
	blockdev_missing $ZDEV
	# 6.3 Check volmode=dev case
	log_must zfs set volmode=dev $TESTPOOL
	verify_inherited 'volmode' 'dev' $ZVOL $TESTPOOL
	blockdev_exists $ZDEV
	# 6.4 Check volmode=default case
	sysctl_volmode 1
	log_must zfs set volmode=default $TESTPOOL
	verify_inherited 'volmode' 'default' $ZVOL $TESTPOOL
	blockdev_exists $ZDEV
	# 6.5 Check inheritance on multiple levels
	log_must zfs inherit volmode $SUBZVOL
	udev_wait
	log_must zfs set volmode=none $VOLFS
	udev_wait
	log_must zfs set volmode=full $TESTPOOL
	verify_inherited 'volmode' 'none' $SUBZVOL $VOLFS
	blockdev_missing $SUBZDEV
	blockdev_exists $ZDEV

	# 7. Verify "volmode" behaves correctly at import time
	log_must zpool export $TESTPOOL
	blockdev_missing $ZDEV
	blockdev_missing $SUBZDEV
	log_must zpool import $TESTPOOL
	blockdev_exists $ZDEV
	blockdev_missing $SUBZDEV
	log_must_busy zfs destroy $ZVOL
	log_must_busy zfs destroy $SUBZVOL

	# 8. Verify "volmode" behaves accordingly to zvol_inhibit_dev (Linux only)
	if is_linux; then
	sysctl_inhibit_dev 1
	# 7.1 Verify device nodes not are not created with "volmode=full"
	sysctl_volmode 1
	log_must zfs create -V $VOLSIZE -s $ZVOL
	blockdev_missing $ZDEV
	log_must zfs set volmode=full $ZVOL
	blockdev_missing $ZDEV
	log_must_busy zfs destroy $ZVOL
	# 7.1 Verify device nodes not are not created with "volmode=dev"
	sysctl_volmode 2
	log_must zfs create -V $VOLSIZE -s $ZVOL
	blockdev_missing $ZDEV
	log_must zfs set volmode=dev $ZVOL
	blockdev_missing $ZDEV
	log_must_busy zfs destroy $ZVOL
	# 7.1 Verify device nodes not are not created with "volmode=none"
	sysctl_volmode 3
	log_must zfs create -V $VOLSIZE -s $ZVOL
	blockdev_missing $ZDEV
	log_must zfs set volmode=none $ZVOL
	blockdev_missing $ZDEV
	fi

	log_pass "Verify that ZFS volume property 'volmode' works as intended"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/zvol/zvol_swap/zvol_swap_004_pos.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/zvol/zvol_swap/zvol_swap_004_pos.ksh
	index be72576707d2..cf1e6359bdb6 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/functional/zvol/zvol_swap/zvol_swap_004_pos.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/functional/zvol/zvol_swap/zvol_swap_004_pos.ksh
	@@ -1,76 +1,76 @@
	#!/bin/ksh -p
	#
	# CDDL HEADER START
	#
	# The contents of this file are subject to the terms of the
	# Common Development and Distribution License (the "License").
	# You may not use this file except in compliance with the License.
	#
	# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	# or http://www.opensolaris.org/os/licensing.
	# See the License for the specific language governing permissions
	# and limitations under the License.
	#
	# When distributing Covered Code, include this CDDL HEADER in each
	# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	# If applicable, add the following below this CDDL HEADER, with the
	# fields enclosed by brackets "[]" replaced with your own identifying
	# information: Portions Copyright [yyyy] [name of copyright owner]
	#
	# CDDL HEADER END
	#

	#
	# Copyright 2007 Sun Microsystems, Inc. All rights reserved.
	# Use is subject to license terms.
	#

	#
	# Copyright (c) 2013, 2016 by Delphix. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/functional/zvol/zvol_common.shlib

	#
	# DESCRIPTION:
	# When a swap zvol is added its volsize does not change.
	#
	# STRATEGY:
	# 1. Determine what 1/4 arc_c_max is.
	# 2. Create a zvols in a variety of sizes.
	# 3. Add them as swap, and verify the volsize is not changed.
	#

	verify_runnable "global"

	function cleanup
	{
	is_swap_inuse $swapname && log_must swap_cleanup $swapname
	datasetexists $vol && log_must zfs destroy $vol
	}

	log_assert "For an added swap zvol, (2G <= volsize <= 16G)"

	log_onexit cleanup

	for vbs in 8192 16384 32768 65536 131072; do
	for multiplier in 32 16384 131072; do
	((volsize = vbs * multiplier))
	vol="$TESTPOOL/vol_$volsize"
	swapname="${ZVOL_DEVDIR}/$vol"

	# Create a sparse volume to test larger sizes
	log_must zfs create -s -b $vbs -V $volsize $vol
	- block_device_wait
	+ block_device_wait $swapname
	log_must swap_setup $swapname

	new_volsize=$(get_prop volsize $vol)
	[[ $volsize -eq $new_volsize ]] \|\| log_fail "$volsize $new_volsize"

	log_must swap_cleanup $swapname
	log_must_busy zfs destroy $vol
	done
	done

	log_pass "For an added swap zvol, (2G <= volsize <= 16G)"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/perf.shlib b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/perf.shlib
	index 6addd46610c2..6f4fdc94348f 100644
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/perf.shlib
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/perf.shlib
	@@ -1,575 +1,602 @@
	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2016 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	# Copyright (c) 2016, Intel Corporation.
	#

	. $STF_SUITE/include/libtest.shlib

	-# If neither is specified, do a nightly run.
	-[[ -z $PERF_REGRESSION_WEEKLY ]] && export PERF_REGRESSION_NIGHTLY=1
	-
	-# Default runtime for each type of test run.
	-export PERF_RUNTIME_WEEKLY=$((30 * 60))
	-export PERF_RUNTIME_NIGHTLY=$((10 * 60))
	+# Defaults common to all the tests in the regression group
	+export PERF_RUNTIME=${PERF_RUNTIME:-'180'}
	+export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	+export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	+export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	+export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}

	# Default to JSON for fio output
	export PERF_FIO_FORMAT=${PERF_FIO_FORMAT:-'json'}

	# Default fs creation options
	export PERF_FS_OPTS=${PERF_FS_OPTS:-'-o recsize=8k -o compress=lz4' \
	' -o checksum=sha256 -o redundant_metadata=most'}

	function get_sync_str
	{
	typeset sync=$1
	typeset sync_str=''

	[[ $sync -eq 0 ]] && sync_str='async'
	[[ $sync -eq 1 ]] && sync_str='sync'
	echo $sync_str
	}

	function get_suffix
	{
	typeset threads=$1
	typeset sync=$2
	typeset iosize=$3

	typeset sync_str=$(get_sync_str $sync)
	typeset filesystems=$(get_nfilesystems)

	typeset suffix="$sync_str.$iosize-ios"
	suffix="$suffix.$threads-threads.$filesystems-filesystems"
	echo $suffix
	}

	function do_fio_run_impl
	{
	typeset script=$1
	typeset do_recreate=$2
	typeset clear_cache=$3

	typeset threads=$4
	typeset threads_per_fs=$5
	typeset sync=$6
	typeset iosize=$7

	typeset sync_str=$(get_sync_str $sync)
	log_note "Running with $threads $sync_str threads, $iosize ios"

	if [[ -n $threads_per_fs && $threads_per_fs -ne 0 ]]; then
	log_must test $do_recreate
	verify_threads_per_fs $threads $threads_per_fs
	fi

	if $do_recreate; then
	recreate_perf_pool

	#
	# A value of zero for "threads_per_fs" is "special", and
	# means a single filesystem should be used, regardless
	# of the number of threads.
	#
	if [[ -n $threads_per_fs && $threads_per_fs -ne 0 ]]; then
	populate_perf_filesystems $((threads / threads_per_fs))
	else
	populate_perf_filesystems 1
	fi
	fi

	if $clear_cache; then
	# Clear the ARC
	- zpool export $PERFPOOL
	- zpool import $PERFPOOL
	+ log_must zinject -a
	fi

	if [[ -n $ZINJECT_DELAYS ]]; then
	apply_zinject_delays
	else
	log_note "No per-device commands to execute."
	fi

	#
	# Allow this to be overridden by the individual test case. This
	# can be used to run the FIO job against something other than
	# the default filesystem (e.g. against a clone).
	#
	export DIRECTORY=$(get_directory)
	log_note "DIRECTORY: " $DIRECTORY

	export RUNTIME=$PERF_RUNTIME
	export RANDSEED=$PERF_RANDSEED
	export COMPPERCENT=$PERF_COMPPERCENT
	export COMPCHUNK=$PERF_COMPCHUNK
	export FILESIZE=$((TOTAL_SIZE / threads))
	export NUMJOBS=$threads
	export SYNC_TYPE=$sync
	export BLOCKSIZE=$iosize
	sync

	# When running locally, we want to keep the default behavior of
	# DIRECT == 0, so only set it when we're running over NFS to
	# disable client cache for reads.
	if [[ $NFS -eq 1 ]]; then
	export DIRECT=1
	do_setup_nfs $script
	else
	export DIRECT=0
	fi

	# This will be part of the output filename.
	typeset suffix=$(get_suffix $threads $sync $iosize)

	# Start the data collection
	do_collect_scripts $suffix

	# Define output file
	typeset logbase="$(get_perf_output_dir)/$(basename \
	$SUDO_COMMAND)"
	typeset outfile="$logbase.fio.$suffix"

	# Start the load
	if [[ $NFS -eq 1 ]]; then
	log_must ssh -t $NFS_USER@$NFS_CLIENT "
	fio --output-format=${PERF_FIO_FORMAT} \
	--output /tmp/fio.out /tmp/test.fio
	"
	log_must scp $NFS_USER@$NFS_CLIENT:/tmp/fio.out $outfile
	log_must ssh -t $NFS_USER@$NFS_CLIENT "sudo -S umount $NFS_MOUNT"
	else
	log_must fio --output-format=${PERF_FIO_FORMAT} \
	--output $outfile $FIO_SCRIPTS/$script
	fi
	}

	#
	# This function will run fio in a loop, according to the .fio file passed
	# in and a number of environment variables. The following variables can be
	# set before launching zfstest to override the defaults.
	#
	# PERF_RUNTIME: The time in seconds each fio invocation should run.
	-# PERF_RUNTYPE: A human readable tag that appears in logs. The defaults are
	-# nightly and weekly.
	# PERF_NTHREADS: A list of how many threads each fio invocation will use.
	# PERF_SYNC_TYPES: Whether to use (O_SYNC) or not. 1 is sync IO, 0 is async IO.
	# PERF_IOSIZES: A list of blocksizes in which each fio invocation will do IO.
	# PERF_COLLECT_SCRIPTS: A comma delimited list of 'command args, logfile_tag'
	# pairs that will be added to the scripts specified in each test.
	#
	function do_fio_run
	{
	typeset script=$1
	typeset do_recreate=$2
	typeset clear_cache=$3
	typeset threads threads_per_fs sync iosize

	for threads in $PERF_NTHREADS; do
	for threads_per_fs in $PERF_NTHREADS_PER_FS; do
	for sync in $PERF_SYNC_TYPES; do
	for iosize in $PERF_IOSIZES; do
	do_fio_run_impl \
	$script \
	$do_recreate \
	$clear_cache \
	$threads \
	$threads_per_fs \
	$sync \
	$iosize
	done
	done
	done
	done
	}

	# This function sets NFS mount on the client and make sure all correct
	# permissions are in place
	#
	function do_setup_nfs
	{
	typeset script=$1
	zfs set sharenfs=on $TESTFS
	log_must chmod -R 777 /$TESTFS

	ssh -t $NFS_USER@$NFS_CLIENT "mkdir -m 777 -p $NFS_MOUNT"
	ssh -t $NFS_USER@$NFS_CLIENT "sudo -S umount $NFS_MOUNT"
	log_must ssh -t $NFS_USER@$NFS_CLIENT "
	sudo -S mount $NFS_OPTIONS $NFS_SERVER:/$TESTFS $NFS_MOUNT
	"
	#
	# The variables in the fio script are only available in our current
	# shell session, so we have to evaluate them here before copying
	# the resulting script over to the target machine.
	#
	export jobnum='$jobnum'
	while read line; do
	eval echo "$line"
	done < $FIO_SCRIPTS/$script > /tmp/test.fio
	log_must sed -i -e "s%directory.*%directory=$NFS_MOUNT%" /tmp/test.fio
	log_must scp /tmp/test.fio $NFS_USER@$NFS_CLIENT:/tmp
	log_must rm /tmp/test.fio
	}

	#
	# This function iterates through the value pairs in $PERF_COLLECT_SCRIPTS.
	# The script at index N is launched in the background, with its output
	# redirected to a logfile containing the tag specified at index N + 1.
	#
	function do_collect_scripts
	{
	typeset suffix=$1

	[[ -n $collect_scripts ]] \|\| log_fail "No data collection scripts."
	[[ -n $PERF_RUNTIME ]] \|\| log_fail "No runtime specified."

	# Add in user supplied scripts and logfiles, if any.
	typeset oIFS=$IFS
	IFS=','
	for item in $PERF_COLLECT_SCRIPTS; do
	collect_scripts+=($(echo $item \| sed 's/^ *//g'))
	done
	IFS=$oIFS

	typeset idx=0
	while [[ $idx -lt "${#collect_scripts[@]}" ]]; do
	typeset logbase="$(get_perf_output_dir)/$(basename \
	$SUDO_COMMAND)"
	typeset outfile="$logbase.${collect_scripts[$idx + 1]}.$suffix"

	timeout $PERF_RUNTIME ${collect_scripts[$idx]} >$outfile 2>&1 &
	((idx += 2))
	done

	# Need to explicitly return 0 because timeout(1) will kill
	# a child process and cause us to return non-zero.
	return 0
	}

	# Find a place to deposit performance data collected while under load.
	function get_perf_output_dir
	{
	typeset dir="$(pwd)/perf_data"
	[[ -d $dir ]] \|\| mkdir -p $dir

	echo $dir
	}

	function apply_zinject_delays
	{
	typeset idx=0
	while [[ $idx -lt "${#ZINJECT_DELAYS[@]}" ]]; do
	[[ -n ${ZINJECT_DELAYS[$idx]} ]] \|\| \
	log_must "No zinject delay found at index: $idx"

	for disk in $DISKS; do
	log_must zinject \
	-d $disk -D ${ZINJECT_DELAYS[$idx]} $PERFPOOL
	done

	((idx += 1))
	done
	}

	function clear_zinject_delays
	{
	log_must zinject -c all
	}

	#
	# Destroy and create the pool used for performance tests.
	#
	function recreate_perf_pool
	{
	[[ -n $PERFPOOL ]] \|\| log_fail "The \$PERFPOOL variable isn't set."

	#
	# In case there's been some "leaked" zinject delays, or if the
	# performance test injected some delays itself, we clear all
	# delays before attempting to destroy the pool. Each delay
	# places a hold on the pool, so the destroy will fail if there
	# are any outstanding delays.
	#
	clear_zinject_delays

	#
	# This function handles the case where the pool already exists,
	# and will destroy the previous pool and recreate a new pool.
	#
	create_pool $PERFPOOL $DISKS
	}

	function verify_threads_per_fs
	{
	typeset threads=$1
	typeset threads_per_fs=$2

	log_must test -n $threads
	log_must test -n $threads_per_fs

	#
	# A value of "0" is treated as a "special value", and it is
	# interpreted to mean all threads will run using a single
	# filesystem.
	#
	[[ $threads_per_fs -eq 0 ]] && return

	#
	# The number of threads per filesystem must be a value greater
	# than or equal to zero; since we just verified the value isn't
	# 0 above, then it must be greater than zero here.
	#
	log_must test $threads_per_fs -ge 0

	#
	# This restriction can be lifted later if needed, but for now,
	# we restrict the number of threads per filesystem to a value
	# that evenly divides the thread count. This way, the threads
	# will be evenly distributed over all the filesystems.
	#
	log_must test $((threads % threads_per_fs)) -eq 0
	}

	function populate_perf_filesystems
	{
	typeset nfilesystems=${1:-1}

	export TESTFS=""
	for i in $(seq 1 $nfilesystems); do
	typeset dataset="$PERFPOOL/fs$i"
	create_dataset $dataset $PERF_FS_OPTS
	if [[ -z "$TESTFS" ]]; then
	TESTFS="$dataset"
	else
	TESTFS="$TESTFS $dataset"
	fi
	done
	}

	function get_nfilesystems
	{
	typeset filesystems=( $TESTFS )
	echo ${#filesystems[@]}
	}

	function get_directory
	{
	typeset filesystems=( $TESTFS )
	typeset directory=

	typeset idx=0
	while [[ $idx -lt "${#filesystems[@]}" ]]; do
	mountpoint=$(get_prop mountpoint "${filesystems[$idx]}")

	if [[ -n $directory ]]; then
	directory=$directory:$mountpoint
	else
	directory=$mountpoint
	fi

	((idx += 1))
	done

	echo $directory
	}

	function get_min_arc_size
	{
	typeset -l min_arc_size

	if is_freebsd; then
	min_arc_size=$(sysctl -n kstat.zfs.misc.arcstats.c_min)
	elif is_illumos; then
	min_arc_size=$(dtrace -qn 'BEGIN {
	printf("%u\n", `arc_stats.arcstat_c_min.value.ui64);
	exit(0);
	}')
	elif is_linux; then
	min_arc_size=`awk '$1 == "c_min" { print $3 }' \
	/proc/spl/kstat/zfs/arcstats`
	fi

	[[ $? -eq 0 ]] \|\| log_fail "get_min_arc_size failed"

	echo $min_arc_size
	}

	function get_max_arc_size
	{
	typeset -l max_arc_size

	if is_freebsd; then
	max_arc_size=$(sysctl -n kstat.zfs.misc.arcstats.c_max)
	elif is_illumos; then
	max_arc_size=$(dtrace -qn 'BEGIN {
	printf("%u\n", `arc_stats.arcstat_c_max.value.ui64);
	exit(0);
	}')
	elif is_linux; then
	max_arc_size=`awk '$1 == "c_max" { print $3 }' \
	/proc/spl/kstat/zfs/arcstats`
	fi

	[[ $? -eq 0 ]] \|\| log_fail "get_max_arc_size failed"

	echo $max_arc_size
	}

	-function get_max_dbuf_cache_size
	+function get_arc_target
	{
	- typeset -l max_dbuf_cache_size
	+ typeset -l arc_c
	+
	+ if is_freebsd; then
	+ arc_c=$(sysctl -n kstat.zfs.misc.arcstats.c)
	+ elif is_illumos; then
	+ arc_c=$(dtrace -qn 'BEGIN {
	+ printf("%u\n", `arc_stats.arcstat_c.value.ui64);
	+ exit(0);
	+ }')
	+ elif is_linux; then
	+ arc_c=`awk '$1 == "c" { print $3 }' \
	+ /proc/spl/kstat/zfs/arcstats`
	+ fi
	+
	+ [[ $? -eq 0 ]] \|\| log_fail "get_arc_target failed"
	+
	+ echo $arc_c
	+}
	+
	+function get_dbuf_cache_size
	+{
	+ typeset -l dbuf_cache_size dbuf_cache_shift

	if is_illumos; then
	- max_dbuf_cache_size=$(dtrace -qn 'BEGIN {
	+ dbuf_cache_size=$(dtrace -qn 'BEGIN {
	printf("%u\n", `dbuf_cache_max_bytes);
	exit(0);
	}')
	else
	- max_dbuf_cache_size=$(get_tunable DBUF_CACHE_MAX_BYTES)
	+ dbuf_cache_shift=$(get_tunable DBUF_CACHE_SHIFT)
	+ dbuf_cache_size=$(($(get_arc_target) / 2**dbuf_cache_shift))
	fi

	- [[ $? -eq 0 ]] \|\| log_fail "get_max_dbuf_cache_size failed"
	+ [[ $? -eq 0 ]] \|\| log_fail "get_dbuf_cache_size failed"

	- echo $max_dbuf_cache_size
	+ echo $dbuf_cache_size
	}

	# Create a file with some information about how this system is configured.
	function get_system_config
	{
	typeset config=$PERF_DATA_DIR/$1

	echo "{" >>$config
	if is_linux; then
	echo " \"ncpus\": \"$(nproc --all)\"," >>$config
	echo " \"physmem\": \"$(free -b \| \
	awk '$1 == "Mem:" { print $2 }')\"," >>$config
	echo " \"c_max\": \"$(get_max_arc_size)\"," >>$config
	echo " \"hostname\": \"$(uname -n)\"," >>$config
	echo " \"kernel version\": \"$(uname -sr)\"," >>$config
	else
	dtrace -qn 'BEGIN{
	printf(" \"ncpus\": %d,\n", `ncpus);
	printf(" \"physmem\": %u,\n", `physmem * `_pagesize);
	printf(" \"c_max\": %u,\n", `arc_stats.arcstat_c_max.value.ui64);
	printf(" \"kmem_flags\": \"0x%x\",", `kmem_flags);
	exit(0)}' >>$config
	echo " \"hostname\": \"$(uname -n)\"," >>$config
	echo " \"kernel version\": \"$(uname -v)\"," >>$config
	fi
	if is_linux; then
	lsblk -dino NAME,SIZE \| awk 'BEGIN {
	printf(" \"disks\": {\n"); first = 1}
	{disk = $1} {size = $2;
	if (first != 1) {printf(",\n")} else {first = 0}
	printf(" \"%s\": \"%s\"", disk, size)}
	END {printf("\n },\n")}' >>$config

	zfs_tunables="/sys/module/zfs/parameters"

	printf " \"tunables\": {\n" >>$config
	for tunable in \
	zfs_arc_max \
	zfs_arc_meta_limit \
	zfs_arc_sys_free \
	zfs_dirty_data_max \
	zfs_flags \
	zfs_prefetch_disable \
	zfs_txg_timeout \
	zfs_vdev_aggregation_limit \
	zfs_vdev_async_read_max_active \
	zfs_vdev_async_write_max_active \
	zfs_vdev_sync_read_max_active \
	zfs_vdev_sync_write_max_active \
	zio_slow_io_ms
	do
	if [ "$tunable" != "zfs_arc_max" ]
	then
	printf ",\n" >>$config
	fi
	printf " \"$tunable\": \"$(<$zfs_tunables/$tunable)\"" \
	>>$config
	done
	printf "\n }\n" >>$config
	else
	iostat -En \| awk 'BEGIN {
	printf(" \"disks\": {\n"); first = 1}
	/^c/ {disk = $1}
	/^Size: [^0]/ {size = $2;
	if (first != 1) {printf(",\n")} else {first = 0}
	printf(" \"%s\": \"%s\"", disk, size)}
	END {printf("\n },\n")}' >>$config

	sed -n 's/^set $.$[ ]=[ ]$.$/\1=\2/p' /etc/system \| \
	awk -F= 'BEGIN {printf(" \"system\": {\n"); first = 1}
	{if (first != 1) {printf(",\n")} else {first = 0};
	printf(" \"%s\": %s", $1, $2)}
	END {printf("\n }\n")}' >>$config
	fi
	echo "}" >>$config
	}

	function num_jobs_by_cpu
	{
	if is_linux; then
	typeset ncpu=$($NPROC --all)
	else
	typeset ncpu=$(psrinfo \| $WC -l)
	fi
	typeset num_jobs=$ncpu

	[[ $ncpu -gt 8 ]] && num_jobs=$(echo "$ncpu * 3 / 4" \| bc)

	echo $num_jobs
	}

	#
	# On illumos this looks like: ":sd3:sd4:sd1:sd2:"
	#
	function pool_to_lun_list
	{
	typeset pool=$1
	typeset ctd ctds devname lun
	typeset lun_list=':'

	if is_illumos; then
	ctds=$(zpool list -v $pool \|
	awk '/c[0-9]t[0-9a-fA-F]d[0-9]*/ {print $1}')

	for ctd in $ctds; do
	# Get the device name as it appears in /etc/path_to_inst
	devname=$(readlink -f /dev/dsk/${ctd}s0 \| sed -n \
	's/\/devices$[^:]$:./\1/p')
	# Add a string composed of the driver name and instance
	# number to the list for comparison with dev_statname.
	lun=$(sed 's/"//g' /etc/path_to_inst \| grep \
	$devname \| awk '{print $3$2}')
	lun_list="$lun_list$lun:"
	done
	elif is_freebsd; then
	lun_list+=$(zpool list -HLv $pool \| \
	awk '/a?da[0-9]+\|md[0-9]+\|mfid[0-9]+\|nda[0-9]+\|nvd[0-9]+\|vtbd[0-9]+/
	{ printf "%s:", $1 }')
	elif is_linux; then
	ctds=$(zpool list -HLv $pool \| \
	awk '/sd[a-z]\|loop[0-9]\|dm-[0-9]*/ {print $1}')

	for ctd in $ctds; do
	lun_list="$lun_list$ctd:"
	done
	fi
	echo $lun_list
	}

	+function print_perf_settings
	+{
	+ echo "PERF_NTHREADS: $PERF_NTHREADS"
	+ echo "PERF_NTHREADS_PER_FS: $PERF_NTHREADS_PER_FS"
	+ echo "PERF_SYNC_TYPES: $PERF_SYNC_TYPES"
	+ echo "PERF_IOSIZES: $PERF_IOSIZES"
	+}
	+
	# Create a perf_data directory to hold performance statistics and
	# configuration information.
	export PERF_DATA_DIR=$(get_perf_output_dir)
	[[ -f $PERF_DATA_DIR/config.json ]] \|\| get_system_config config.json
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_reads.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_reads.ksh
	index e6d207e22747..5c8066d17549 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_reads.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_reads.ksh
	@@ -1,114 +1,96 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the random_reads job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# The files to read from are created prior to the first fio run, and used
	# for all fio runs. The ARC is cleared with `zinject -a` prior to each run
	# so reads will go to disk.
	#
	# Thread/Concurrency settings:
	# PERF_NTHREADS defines the number of files created in the test filesystem,
	# as well as the number of threads that will simultaneously drive IO to
	# those files. The settings chosen are from measurements in the
	# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
	# are at peak throughput but lowest latency. Higher concurrency introduces
	# queue time latency and would reduce the impact of code-induced performance
	# regressions.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random read load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Aim to fill the pool to 50% capacity while accounting for a 3x compressratio.
	export TOTAL_SIZE=$(($(get_prop avail $PERFPOOL) * 3 / 2))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 32 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k 64k 128k'}
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'16 32'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'16 32'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}

	# Layout the files to be used by the read tests. Create as many files as the
	# largest number of threads. An fio run with fewer threads will use a subset
	# of the available files.
	export NUMJOBS=$(get_max $PERF_NTHREADS)
	export FILE_SIZE=$((TOTAL_SIZE / NUMJOBS))
	export DIRECTORY=$(get_directory)
	log_must fio $FIO_SCRIPTS/mkfiles.fio

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"$PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	)
	fi

	-log_note "Random reads with $PERF_RUNTYPE settings"
	+log_note "Random reads with settings: $(print_perf_settings)"
	do_fio_run random_reads.fio false true
	log_pass "Measure IO stats during random read load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_readwrite.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_readwrite.ksh
	index 573e9c7d4c58..33d7d8c8d945 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_readwrite.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_readwrite.ksh
	@@ -1,114 +1,96 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the random_readwrite job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# The files to read and write from are created prior to the first fio run,
	# and used for all fio runs. The ARC is cleared with `zinject -a` prior to
	# each run so reads will go to disk.
	#
	# Thread/Concurrency settings:
	# PERF_NTHREADS defines the number of files created in the test filesystem,
	# as well as the number of threads that will simultaneously drive IO to
	# those files. The settings chosen are from measurements in the
	# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
	# are at peak throughput but lowest latency. Higher concurrency introduces
	# queue time latency and would reduce the impact of code-induced performance
	# regressions.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random read load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Aim to fill the pool to 50% capacity while accounting for a 3x compressratio.
	export TOTAL_SIZE=$(($(get_prop avail $PERFPOOL) * 3 / 2))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'4 8 16 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'0 1'}
	- export PERF_IOSIZES='' # bssplit used instead
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'32 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES='' # bssplit used instead
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'32 64'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES='' # bssplit used instead

	# Layout the files to be used by the readwrite tests. Create as many files
	# as the largest number of threads. An fio run with fewer threads will use
	# a subset of the available files.
	export NUMJOBS=$(get_max $PERF_NTHREADS)
	export FILE_SIZE=$((TOTAL_SIZE / NUMJOBS))
	export DIRECTORY=$(get_directory)
	log_must fio $FIO_SCRIPTS/mkfiles.fio

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"$PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	)
	fi

	-log_note "Random reads and writes with $PERF_RUNTYPE settings"
	+log_note "Random reads and writes with settings: $(print_perf_settings)"
	do_fio_run random_readwrite.fio false true
	log_pass "Measure IO stats during random read and write load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_readwrite_fixed.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_readwrite_fixed.ksh
	index 78af5213a3d3..bb4014563f1f 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_readwrite_fixed.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_readwrite_fixed.ksh
	@@ -1,106 +1,88 @@
	#!/bin/ksh

	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2017, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2017, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the random_readwrite_fixed job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# The files to read and write from are created prior to the first fio run,
	# and used for all fio runs. The ARC is cleared with `zinject -a` prior to
	# each run so reads will go to disk.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random read write load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Aim to fill the pool to 50% capacity while accounting for a 3x compressratio.
	export TOTAL_SIZE=$(($(get_prop avail $PERFPOOL) * 3 / 2))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 32 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'0 1'}
	- export PERF_IOSIZES='8k 64k'
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES='8k'
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}

	# Layout the files to be used by the readwrite tests. Create as many files
	# as the largest number of threads. An fio run with fewer threads will use
	# a subset of the available files.
	export NUMJOBS=$(get_max $PERF_NTHREADS)
	export FILE_SIZE=$((TOTAL_SIZE / NUMJOBS))
	export DIRECTORY=$(get_directory)
	log_must fio $FIO_SCRIPTS/mkfiles.fio

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"kstat zfs:0 1" "kstat"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	"dtrace -Cs $PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"dtrace -s $PERF_SCRIPTS/profile.d" "profile"
	)
	fi

	-log_note "Random reads and writes with $PERF_RUNTYPE settings"
	+log_note "Random reads and writes with settings: $(print_perf_settings)"
	do_fio_run random_readwrite_fixed.fio false true
	log_pass "Measure IO stats during random read and write load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_writes.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_writes.ksh
	index dca013cbae0c..4b826835efbf 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_writes.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_writes.ksh
	@@ -1,105 +1,87 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the random_writes job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# Prior to each fio run the dataset is recreated, and fio writes new files
	# into an otherwise empty pool.
	#
	# Thread/Concurrency settings:
	# PERF_NTHREADS defines the number of files created in the test filesystem,
	# as well as the number of threads that will simultaneously drive IO to
	# those files. The settings chosen are from measurements in the
	# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
	# are at peak throughput but lowest latency. Higher concurrency introduces
	# queue time latency and would reduce the impact of code-induced performance
	# regressions.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random read load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Aim to fill the pool to 50% capacity while accounting for a 3x compressratio.
	export TOTAL_SIZE=$(($(get_prop avail $PERFPOOL) * 3 / 2))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'1 4 8 16 32 64 128'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'0 1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k 64k 256k'}
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'32 128'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'32 128'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"$PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	)
	fi

	-log_note "Random writes with $PERF_RUNTYPE settings"
	+log_note "Random writes with settings: $(print_perf_settings)"
	do_fio_run random_writes.fio true false
	log_pass "Measure IO stats during random write load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_writes_zil.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_writes_zil.ksh
	index 5d4fd77a7458..522ee4526828 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_writes_zil.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/random_writes_zil.ksh
	@@ -1,100 +1,83 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat

	#
	# We're using many filesystems depending on the number of
	# threads for each test, and there's no good way to get a list
	# of all the filesystems that should be destroyed on cleanup
	# (i.e. the list of filesystems used for the last test ran).
	# Thus, we simply recreate the pool as a way to destroy all
	# filesystems and leave a fresh pool behind.
	#
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random write load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool

	# Aim to fill the pool to 50% capacity while accounting for a 3x compressratio.
	export TOTAL_SIZE=$(($(get_prop avail $PERFPOOL) * 3 / 2))

	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'1 2 4 8 16 32 64 128'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0 1'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}
	-
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'1 4 16 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0 1'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'1 4 16 64'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0 1'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}

	# Until the performance tests over NFS can deal with multiple file systems,
	# force the use of only one file system when testing over NFS.
	[[ $NFS -eq 1 ]] && PERF_NTHREADS_PER_FS='0'

	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"kstat zfs:0 1" "kstat"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	"dtrace -Cs $PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"dtrace -s $PERF_SCRIPTS/zil.d $PERFPOOL 1" "zil"
	"dtrace -s $PERF_SCRIPTS/profile.d" "profile"
	"dtrace -s $PERF_SCRIPTS/offcpu-profile.d" "offcpu-profile"
	)
	fi
	-log_note "ZIL specific random write workload with $PERF_RUNTYPE settings"
	+log_note \
	+ "ZIL specific random write workload with settings: $(print_perf_settings)"
	do_fio_run random_writes.fio true false
	log_pass "Measure IO stats during ZIL specific random write workload"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads.ksh
	index e5cf6278391c..2bdfff736f4e 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads.ksh
	@@ -1,116 +1,98 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the sequential_reads job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# The files to read from are created prior to the first fio run, and used
	# for all fio runs. The ARC is cleared with `zinject -a` prior to each run
	# so reads will go to disk.
	#
	# Thread/Concurrency settings:
	# PERF_NTHREADS defines the number of files created in the test filesystem,
	# as well as the number of threads that will simultaneously drive IO to
	# those files. The settings chosen are from measurements in the
	# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
	# are at peak throughput but lowest latency. Higher concurrency introduces
	# queue time latency and would reduce the impact of code-induced performance
	# regressions.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random read load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Aim to fill the pool to 50% capacity while accounting for a 3x compressratio.
	export TOTAL_SIZE=$(($(get_prop avail $PERFPOOL) * 3 / 2))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 32 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k 64k 128k'}
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'8 16'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'128k 1m'}
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'8 16'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'128k 1m'}

	# Layout the files to be used by the read tests. Create as many files as the
	# largest number of threads. An fio run with fewer threads will use a subset
	# of the available files.
	export NUMJOBS=$(get_max $PERF_NTHREADS)
	export FILE_SIZE=$((TOTAL_SIZE / NUMJOBS))
	export DIRECTORY=$(get_directory)
	log_must fio $FIO_SCRIPTS/mkfiles.fio

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"$PERF_SCRIPTS/prefetch_io.sh $PERFPOOL 1" "prefetch"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"$PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"$PERF_SCRIPTS/prefetch_io.d $PERFPOOL 1" "prefetch"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	)
	fi

	-log_note "Sequential reads with $PERF_RUNTYPE settings"
	+log_note "Sequential reads with settings: $(print_perf_settings)"
	do_fio_run sequential_reads.fio false true
	log_pass "Measure IO stats during sequential read load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_arc_cached.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_arc_cached.ksh
	index d44e37f3eaaf..8127786361ba 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_arc_cached.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_arc_cached.ksh
	@@ -1,106 +1,88 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the sequential_reads job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# The files to read from are created prior to the first fio run, and used
	# for all fio runs. The ARC is not cleared to ensure that all data is cached.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random read load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Make sure the working set can be cached in the arc. Aim for 1/2 of arc.
	export TOTAL_SIZE=$(($(get_max_arc_size) / 2))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 32 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k 64k 128k'}
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'128k 1m'}
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'128k 1m'}

	# Layout the files to be used by the read tests. Create as many files as the
	# largest number of threads. An fio run with fewer threads will use a subset
	# of the available files.
	export NUMJOBS=$(get_max $PERF_NTHREADS)
	export FILE_SIZE=$((TOTAL_SIZE / NUMJOBS))
	export DIRECTORY=$(get_directory)
	log_must fio $FIO_SCRIPTS/mkfiles.fio

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"$PERF_SCRIPTS/prefetch_io.sh $PERFPOOL 1" "prefetch"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"$PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"$PERF_SCRIPTS/prefetch_io.d $PERFPOOL 1" "prefetch"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	)
	fi

	-log_note "Sequential cached reads with $PERF_RUNTYPE settings"
	+log_note "Sequential cached reads with settings: $(print_perf_settings)"
	do_fio_run sequential_reads.fio false false
	log_pass "Measure IO stats during sequential cached read load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_arc_cached_clone.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_arc_cached_clone.ksh
	index 1b3ee85ec55a..8ce1273c2869 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_arc_cached_clone.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_arc_cached_clone.ksh
	@@ -1,132 +1,115 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the sequential_reads job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# The files to read from are created prior to the first fio run, and used
	# for all fio runs. This test will exercise cached read performance from
	# a clone filesystem. The data is initially cached in the ARC and then
	# a snapshot and clone are created. All the performance runs are then
	# initiated against the clone filesystem to exercise the performance of
	# reads when the ARC has to create another buffer from a different dataset.
	# It will also exercise the need to evict the duplicate buffer once the last
	# reference on that buffer is released.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random read load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Make sure the working set can be cached in the arc. Aim for 1/2 of arc.
	export TOTAL_SIZE=$(($(get_max_arc_size) / 2))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 32 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k 64k 128k'}
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'128k 1m'}
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'128k 1m'}

	# Layout the files to be used by the read tests. Create as many files as the
	# largest number of threads. An fio run with fewer threads will use a subset
	# of the available files.
	export NUMJOBS=$(get_max $PERF_NTHREADS)
	export FILE_SIZE=$((TOTAL_SIZE / NUMJOBS))
	export DIRECTORY=$(get_directory)
	log_must fio $FIO_SCRIPTS/mkfiles.fio

	#
	# Only a single filesystem is used by this test. To be defensive, we
	# double check that TESTFS only contains a single filesystem. We
	# wouldn't want to assume this was the case, and have it actually
	# contain multiple filesystem (causing cascading failures later).
	#
	log_must test $(get_nfilesystems) -eq 1

	log_note "Creating snapshot, $TESTSNAP, of $TESTFS"
	create_snapshot $TESTFS $TESTSNAP
	log_note "Creating clone, $PERFPOOL/$TESTCLONE, from $TESTFS@$TESTSNAP"
	create_clone $TESTFS@$TESTSNAP $PERFPOOL/$TESTCLONE

	#
	# We want to run FIO against the clone we created above, and not the
	# clone's originating filesystem. Thus, we override the default behavior
	# and explicitly set TESTFS to the clone.
	#
	export TESTFS=$PERFPOOL/$TESTCLONE

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"$PERF_SCRIPTS/prefetch_io.sh $PERFPOOL 1" "prefetch"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"$PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"$PERF_SCRIPTS/prefetch_io.d $PERFPOOL 1" "prefetch"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	)
	fi

	-log_note "Sequential cached reads from $DIRECTORY with $PERF_RUNTYPE settings"
	+log_note "Sequential cached reads from $DIRECTORY with " \
	+ "ettings: $(print_perf_settings)"
	do_fio_run sequential_reads.fio false false
	log_pass "Measure IO stats during sequential cached read load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_dbuf_cached.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_dbuf_cached.ksh
	index 888136fec93c..adacdc29799c 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_dbuf_cached.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_reads_dbuf_cached.ksh
	@@ -1,112 +1,94 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2016, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2016, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the sequential_reads job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# The files to read from are created prior to the first fio run, and used
	# for all fio runs. The ARC is not cleared to ensure that all data is cached.
	#
	# This is basically a copy of the sequential_reads_cached test case, but with
	# a smaller dataset so that we can fit everything into the decompressed, linear
	# space in the dbuf cache.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during sequential read load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Ensure the working set can be cached in the dbuf cache.
	-export TOTAL_SIZE=$(($(get_max_dbuf_cache_size) * 3 / 4))
	+export TOTAL_SIZE=$(($(get_dbuf_cache_size) * 3 / 4))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 32 64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k 64k 128k'}
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'64'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'64k'}
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'64'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'64k'}

	# Layout the files to be used by the read tests. Create as many files as the
	# largest number of threads. An fio run with fewer threads will use a subset
	# of the available files.
	export NUMJOBS=$(get_max $PERF_NTHREADS)
	export FILE_SIZE=$((TOTAL_SIZE / NUMJOBS))
	export DIRECTORY=$(get_directory)
	log_must fio $FIO_SCRIPTS/mkfiles.fio

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"$PERF_SCRIPTS/prefetch_io.sh $PERFPOOL 1" "prefetch"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"kstat zfs:0 1" "kstat"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	"dtrace -Cs $PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"dtrace -Cs $PERF_SCRIPTS/prefetch_io.d $PERFPOOL 1" "prefetch"
	"dtrace -s $PERF_SCRIPTS/profile.d" "profile"
	)
	fi

	-log_note "Sequential cached reads with $PERF_RUNTYPE settings"
	+log_note "Sequential cached reads with settings: $(print_perf_settings)"
	do_fio_run sequential_reads.fio false false
	log_pass "Measure IO stats during sequential cached read load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_writes.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_writes.ksh
	index b4f466c4f65c..d32690a0542e 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_writes.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/sequential_writes.ksh
	@@ -1,105 +1,87 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015, 2020 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	#
	# Description:
	# Trigger fio runs using the sequential_writes job file. The number of runs and
	# data collected is determined by the PERF_* variables. See do_fio_run for
	# details about these variables.
	#
	# Prior to each fio run the dataset is recreated, and fio writes new files
	# into an otherwise empty pool.
	#
	# Thread/Concurrency settings:
	# PERF_NTHREADS defines the number of files created in the test filesystem,
	# as well as the number of threads that will simultaneously drive IO to
	# those files. The settings chosen are from measurements in the
	# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
	# are at peak throughput but lowest latency. Higher concurrency introduces
	# queue time latency and would reduce the impact of code-induced performance
	# regressions.
	#

	. $STF_SUITE/include/libtest.shlib
	. $STF_SUITE/tests/perf/perf.shlib

	function cleanup
	{
	# kill fio and iostat
	pkill fio
	pkill iostat
	recreate_perf_pool
	}

	trap "log_fail \"Measure IO stats during random read load\"" SIGTERM
	log_onexit cleanup

	recreate_perf_pool
	populate_perf_filesystems

	# Aim to fill the pool to 50% capacity while accounting for a 3x compressratio.
	export TOTAL_SIZE=$(($(get_prop avail $PERFPOOL) * 3 / 2))

	-# Variables for use by fio.
	-if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'1 4 8 16 32 64 128'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'0 1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k 64k 256k'}
	-elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
	- export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
	- export PERF_RANDSEED=${PERF_RANDSEED:-'1234'}
	- export PERF_COMPPERCENT=${PERF_COMPPERCENT:-'66'}
	- export PERF_COMPCHUNK=${PERF_COMPCHUNK:-'4096'}
	- export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
	- export PERF_NTHREADS=${PERF_NTHREADS:-'16 32'}
	- export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	- export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
	- export PERF_IOSIZES=${PERF_IOSIZES:-'8k 128k 1m'}
	-fi
	+# Variables specific to this test for use by fio.
	+export PERF_NTHREADS=${PERF_NTHREADS:-'16 32'}
	+export PERF_NTHREADS_PER_FS=${PERF_NTHREADS_PER_FS:-'0'}
	+export PERF_IOSIZES=${PERF_IOSIZES:-'8k 128k 1m'}

	# Set up the scripts and output files that will log performance data.
	lun_list=$(pool_to_lun_list $PERFPOOL)
	log_note "Collecting backend IO stats with lun list $lun_list"
	if is_linux; then
	typeset perf_record_cmd="perf record -F 99 -a -g -q \
	-o /dev/stdout -- sleep ${PERF_RUNTIME}"

	export collect_scripts=(
	"zpool iostat -lpvyL $PERFPOOL 1" "zpool.iostat"
	"vmstat -t 1" "vmstat"
	"mpstat -P ALL 1" "mpstat"
	"iostat -tdxyz 1" "iostat"
	"$perf_record_cmd" "perf"
	)
	else
	export collect_scripts=(
	"$PERF_SCRIPTS/io.d $PERFPOOL $lun_list 1" "io"
	"vmstat -T d 1" "vmstat"
	"mpstat -T d 1" "mpstat"
	"iostat -T d -xcnz 1" "iostat"
	)
	fi

	-log_note "Sequential writes with $PERF_RUNTYPE settings"
	+log_note "Sequential writes with settings: $(print_perf_settings)"
	do_fio_run sequential_writes.fio true false
	log_pass "Measure IO stats during sequential write load"
	diff --git a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/setup.ksh b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/setup.ksh
	index 1544f637d8d9..68be00d4a63c 100755
	--- a/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/setup.ksh
	+++ b/sys/contrib/openzfs/tests/zfs-tests/tests/perf/regression/setup.ksh
	@@ -1,23 +1,22 @@
	#!/bin/ksh

	#
	# This file and its contents are supplied under the terms of the
	# Common Development and Distribution License ("CDDL"), version 1.0.
	# You may only use this file in accordance with the terms of version
	# 1.0 of the CDDL.
	#
	# A full copy of the text of the CDDL should have accompanied this
	# source. A copy of the CDDL is also available via the Internet at
	# http://www.illumos.org/license/CDDL.
	#

	#
	-# Copyright (c) 2015 by Delphix. All rights reserved.
	+# Copyright (c) 2015, 2021 by Delphix. All rights reserved.
	#

	. $STF_SUITE/include/libtest.shlib

	verify_runnable "global"
	-verify_disk_count "$DISKS" 3

	log_pass
	diff --git a/sys/contrib/openzfs/udev/rules.d/60-zvol.rules.in b/sys/contrib/openzfs/udev/rules.d/60-zvol.rules.in
	index 60bbff8d2df0..a3c7d2acf752 100644
	--- a/sys/contrib/openzfs/udev/rules.d/60-zvol.rules.in
	+++ b/sys/contrib/openzfs/udev/rules.d/60-zvol.rules.in
	@@ -1,6 +1,6 @@
	# Persistent links for zvol
	#
	# persistent disk links: /dev/zvol/dataset_name
	# also creates compatibility symlink of /dev/dataset_name

	-KERNEL=="zd*" SUBSYSTEM=="block" ACTION=="add\|change" PROGRAM="@udevdir@/zvol_id $tempnode" SYMLINK+="zvol/%c %c"
	+KERNEL=="zd*", SUBSYSTEM=="block", ACTION=="add\|change", PROGRAM=="@udevdir@/zvol_id $devnode", SYMLINK+="zvol/%c %c"
	diff --git a/sys/modules/zfs/Makefile b/sys/modules/zfs/Makefile
	index 983f0aa0e994..d185fdf259a5 100644
	--- a/sys/modules/zfs/Makefile
	+++ b/sys/modules/zfs/Makefile
	@@ -1,340 +1,341 @@
	# $FreeBSD$

	SRCDIR=${SRCTOP}/sys/contrib/openzfs/module
	INCDIR=${SRCTOP}/sys/contrib/openzfs/include

	KMOD= zfs

	.PATH: ${SRCDIR}/avl \
	${SRCDIR}/lua \
	${SRCDIR}/nvpair \
	${SRCDIR}/os/freebsd/spl \
	${SRCDIR}/os/freebsd/zfs \
	${SRCDIR}/unicode \
	${SRCDIR}/zcommon \
	${SRCDIR}/zfs \
	${SRCDIR}/zstd \
	${SRCDIR}/zstd/lib


	CFLAGS+= -I${INCDIR}
	CFLAGS+= -I${INCDIR}/os/freebsd
	CFLAGS+= -I${INCDIR}/os/freebsd/spl
	CFLAGS+= -I${INCDIR}/os/freebsd/zfs
	CFLAGS+= -I${SRCDIR}/zstd/include
	CFLAGS+= -I${.CURDIR}

	CFLAGS+= -D__KERNEL__ -DFREEBSD_NAMECACHE -DBUILDING_ZFS \
	-DHAVE_UIO_ZEROCOPY -DWITHOUT_NETDUMP -D__KERNEL -D_SYS_CONDVAR_H_ \
	-D_SYS_VMEM_H_ -DIN_FREEBSD_BASE -DHAVE_KSID

	.if ${MACHINE_ARCH} == "amd64"
	CFLAGS+= -DHAVE_AVX2 -DHAVE_AVX -D__x86_64 -DHAVE_SSE2 -DHAVE_AVX512F -DHAVE_AVX512BW -DHAVE_SSSE3
	.endif

	.if ${MACHINE_ARCH} == "i386" \|\| ${MACHINE_ARCH} == "powerpc" \|\| \
	${MACHINE_ARCH} == "powerpcspe" \|\| ${MACHINE_ARCH} == "arm"
	CFLAGS+= -DBITS_PER_LONG=32
	.else
	CFLAGS+= -DBITS_PER_LONG=64
	.endif

	SRCS= vnode_if.h device_if.h bus_if.h

	# avl
	SRCS+= avl.c

	#lua
	SRCS+= lapi.c \
	lauxlib.c \
	lbaselib.c \
	lcode.c \
	lcompat.c \
	lcorolib.c \
	lctype.c \
	ldebug.c \
	ldo.c \
	lfunc.c \
	lgc.c \
	llex.c \
	lmem.c \
	lobject.c \
	lopcodes.c \
	lparser.c \
	lstate.c \
	lstring.c \
	lstrlib.c \
	ltable.c \
	ltablib.c \
	ltm.c \
	lvm.c \
	lzio.c

	#nvpair
	SRCS+= nvpair.c \
	fnvpair.c \
	nvpair_alloc_spl.c \
	nvpair_alloc_fixed.c

	#os/freebsd/spl
	SRCS+= acl_common.c \
	btree.c \
	callb.c \
	list.c \
	spl_acl.c \
	spl_cmn_err.c \
	spl_dtrace.c \
	spl_kmem.c \
	spl_kstat.c \
	spl_misc.c \
	spl_policy.c \
	spl_string.c \
	spl_sunddi.c \
	spl_sysevent.c \
	spl_taskq.c \
	spl_uio.c \
	spl_vfs.c \
	spl_vm.c \
	spl_zone.c \
	sha256c.c \
	sha512c.c \
	spl_procfs_list.c \
	spl_zlib.c


	.if ${MACHINE_ARCH} == "i386" \|\| ${MACHINE_ARCH} == "powerpc" \|\| \
	${MACHINE_ARCH} == "powerpcspe" \|\| ${MACHINE_ARCH} == "arm"
	SRCS+= spl_atomic.c
	.endif

	#os/freebsd/zfs
	SRCS+= abd_os.c \
	crypto_os.c \
	dmu_os.c \
	hkdf.c \
	kmod_core.c \
	spa_os.c \
	sysctl_os.c \
	vdev_file.c \
	vdev_label_os.c \
	vdev_geom.c \
	zfs_acl.c \
	zfs_ctldir.c \
	zfs_dir.c \
	zfs_ioctl_compat.c \
	zfs_ioctl_os.c \
	zfs_log.c \
	zfs_racct.c \
	zfs_replay.c \
	zfs_vfsops.c \
	zfs_vnops_os.c \
	zfs_znode.c \
	zio_crypt.c \
	zvol_os.c

	#unicode
	SRCS+= uconv.c \
	u8_textprep.c

	#zcommon
	SRCS+= zfeature_common.c \
	zfs_comutil.c \
	zfs_deleg.c \
	zfs_fletcher.c \
	zfs_fletcher_avx512.c \
	zfs_fletcher_intel.c \
	zfs_fletcher_sse.c \
	zfs_fletcher_superscalar.c \
	zfs_fletcher_superscalar4.c \
	zfs_namecheck.c \
	zfs_prop.c \
	zpool_prop.c \
	zprop_common.c

	#zfs
	SRCS+= abd.c \
	aggsum.c \
	arc.c \
	arc_os.c \
	blkptr.c \
	bplist.c \
	bpobj.c \
	cityhash.c \
	dbuf.c \
	dbuf_stats.c \
	bptree.c \
	bqueue.c \
	dataset_kstats.c \
	ddt.c \
	ddt_zap.c \
	dmu.c \
	dmu_diff.c \
	dmu_object.c \
	dmu_objset.c \
	dmu_recv.c \
	dmu_redact.c \
	dmu_send.c \
	dmu_traverse.c \
	dmu_tx.c \
	dmu_zfetch.c \
	dnode.c \
	dnode_sync.c \
	dsl_dataset.c \
	dsl_deadlist.c \
	dsl_deleg.c \
	dsl_bookmark.c \
	dsl_dir.c \
	dsl_crypt.c \
	dsl_destroy.c \
	dsl_pool.c \
	dsl_prop.c \
	dsl_scan.c \
	dsl_synctask.c \
	dsl_userhold.c \
	fm.c \
	gzip.c \
	lzjb.c \
	lz4.c \
	metaslab.c \
	mmp.c \
	multilist.c \
	objlist.c \
	pathname.c \
	range_tree.c \
	refcount.c \
	rrwlock.c \
	sa.c \
	sha256.c \
	skein_zfs.c \
	spa.c \
	spa_boot.c \
	spa_checkpoint.c \
	spa_config.c \
	spa_errlog.c \
	spa_history.c \
	spa_log_spacemap.c \
	spa_misc.c \
	spa_stats.c \
	space_map.c \
	space_reftree.c \
	txg.c \
	uberblock.c \
	unique.c \
	vdev.c \
	vdev_cache.c \
	vdev_draid.c \
	vdev_draid_rand.c \
	vdev_indirect.c \
	vdev_indirect_births.c \
	vdev_indirect_mapping.c \
	vdev_initialize.c \
	vdev_label.c \
	vdev_mirror.c \
	vdev_missing.c \
	vdev_queue.c \
	vdev_raidz.c \
	vdev_raidz_math.c \
	vdev_raidz_math_scalar.c \
	vdev_raidz_math_avx2.c \
	vdev_raidz_math_avx512bw.c \
	vdev_raidz_math_avx512f.c \
	vdev_raidz_math_sse2.c \
	vdev_raidz_math_ssse3.c \
	vdev_rebuild.c \
	vdev_removal.c \
	vdev_root.c \
	vdev_trim.c \
	zap.c \
	zap_leaf.c \
	zap_micro.c \
	zcp.c \
	zcp_get.c \
	zcp_global.c \
	zcp_iter.c \
	zcp_set.c \
	zcp_synctask.c \
	zfeature.c \
	zfs_byteswap.c \
	zfs_debug.c \
	zfs_file_os.c \
	zfs_fm.c \
	zfs_fuid.c \
	zfs_ioctl.c \
	zfs_onexit.c \
	zfs_quota.c \
	zfs_ratelimit.c \
	zfs_rlock.c \
	zfs_sa.c \
	zfs_vnops.c \
	zil.c \
	zio.c \
	zio_checksum.c \
	zio_compress.c \
	zio_inject.c \
	zle.c \
	zrlock.c \
	zthr.c \
	zvol.c

	SRCS+= zfs_zstd.c \
	- zstd.c
	+ zstd.c \
	+ zstd_sparc.c

	.include <bsd.kmod.mk>

	CFLAGS+= -include ${SRCTOP}/sys/cddl/compat/opensolaris/sys/debug_compat.h
	CFLAGS+= -include ${INCDIR}/os/freebsd/spl/sys/ccompile.h
	CFLAGS+= -include ${SRCTOP}/sys/modules/zfs/static_ccompile.h

	CWARNFLAGS+= ${OPENZFS_CWARNFLAGS}

	CFLAGS.gcc+= -Wno-pointer-to-int-cast

	CFLAGS.lapi.c= -Wno-cast-qual
	CFLAGS.lcompat.c= -Wno-cast-qual
	CFLAGS.lobject.c= -Wno-cast-qual
	CFLAGS.ltable.c= -Wno-cast-qual
	CFLAGS.lvm.c= -Wno-cast-qual
	CFLAGS.nvpair.c= -Wno-cast-qual -DHAVE_RPC_TYPES
	CFLAGS.spl_string.c= -Wno-cast-qual
	CFLAGS.spl_vm.c= -Wno-cast-qual
	CFLAGS.spl_zlib.c= -Wno-cast-qual
	CFLAGS.abd.c= -Wno-cast-qual
	CFLAGS.zfs_log.c= -Wno-cast-qual
	CFLAGS.zfs_vnops_os.c= -Wno-pointer-arith
	CFLAGS.u8_textprep.c= -Wno-cast-qual
	CFLAGS.zfs_fletcher.c= -Wno-cast-qual -Wno-pointer-arith
	CFLAGS.zfs_fletcher_intel.c= -Wno-cast-qual -Wno-pointer-arith
	CFLAGS.zfs_fletcher_sse.c= -Wno-cast-qual -Wno-pointer-arith
	CFLAGS.zfs_fletcher_avx512.c= -Wno-cast-qual -Wno-pointer-arith
	CFLAGS.zprop_common.c= -Wno-cast-qual
	CFLAGS.ddt.c= -Wno-cast-qual
	CFLAGS.dmu.c= -Wno-cast-qual
	CFLAGS.dmu_traverse.c= -Wno-cast-qual
	CFLAGS.dsl_dir.c= -Wno-cast-qual
	CFLAGS.dsl_deadlist.c= -Wno-cast-qual
	CFLAGS.dsl_prop.c= -Wno-cast-qual
	CFLAGS.fm.c= -Wno-cast-qual
	CFLAGS.lz4.c= -Wno-cast-qual
	CFLAGS.spa.c= -Wno-cast-qual
	CFLAGS.spa_misc.c= -Wno-cast-qual
	CFLAGS.sysctl_os.c= -include ${SRCTOP}/sys/modules/zfs/zfs_config.h
	CFLAGS.vdev_draid.c= -Wno-cast-qual
	CFLAGS.vdev_raidz.c= -Wno-cast-qual
	CFLAGS.vdev_raidz_math.c= -Wno-cast-qual
	CFLAGS.vdev_raidz_math_scalar.c= -Wno-cast-qual
	CFLAGS.vdev_raidz_math_avx2.c= -Wno-cast-qual -Wno-duplicate-decl-specifier
	CFLAGS.vdev_raidz_math_avx512f.c= -Wno-cast-qual -Wno-duplicate-decl-specifier
	CFLAGS.vdev_raidz_math_sse2.c= -Wno-cast-qual -Wno-duplicate-decl-specifier
	CFLAGS.zap_leaf.c= -Wno-cast-qual
	CFLAGS.zap_micro.c= -Wno-cast-qual
	CFLAGS.zcp.c= -Wno-cast-qual
	CFLAGS.zfs_fm.c= -Wno-cast-qual
	CFLAGS.zfs_ioctl.c= -Wno-cast-qual
	CFLAGS.zil.c= -Wno-cast-qual
	CFLAGS.zio.c= -Wno-cast-qual
	CFLAGS.zrlock.c= -Wno-cast-qual
	CFLAGS.zfs_zstd.c= -Wno-cast-qual -Wno-pointer-arith
	CFLAGS.zstd.c= -U__BMI__ -fno-tree-vectorize
	.if ${MACHINE_CPUARCH} == "aarch64"
	CFLAGS.zstd.c+= -include ${SRCDIR}/zstd/include/aarch64_compat.h
	.endif
	diff --git a/sys/modules/zfs/zfs_config.h b/sys/modules/zfs/zfs_config.h
	index ebad45d3def7..fa3d4feec5de 100644
	--- a/sys/modules/zfs/zfs_config.h
	+++ b/sys/modules/zfs/zfs_config.h
	@@ -1,852 +1,852 @@
	/*
	* $FreeBSD$
	*/

	/* zfs_config.h. Generated from zfs_config.h.in by configure. */
	/* zfs_config.h.in. Generated from configure.ac by autoheader. */

	/* Define to 1 if translation of program messages to the user's native
	language is requested. */
	/* #undef ENABLE_NLS */

	/* bio_end_io_t wants 1 arg */
	/* #undef HAVE_1ARG_BIO_END_IO_T */

	/* lookup_bdev() wants 1 arg */
	/* #undef HAVE_1ARG_LOOKUP_BDEV */

	/* submit_bio() wants 1 arg */
	/* #undef HAVE_1ARG_SUBMIT_BIO */

	/* bdi_setup_and_register() wants 2 args */
	/* #undef HAVE_2ARGS_BDI_SETUP_AND_REGISTER */

	/* vfs_getattr wants 2 args */
	/* #undef HAVE_2ARGS_VFS_GETATTR */

	/* zlib_deflate_workspacesize() wants 2 args */
	/* #undef HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE */

	/* bdi_setup_and_register() wants 3 args */
	/* #undef HAVE_3ARGS_BDI_SETUP_AND_REGISTER */

	/* vfs_getattr wants 3 args */
	/* #undef HAVE_3ARGS_VFS_GETATTR */

	/* vfs_getattr wants 4 args */
	/* #undef HAVE_4ARGS_VFS_GETATTR */

	/* kernel has access_ok with 'type' parameter */
	/* #undef HAVE_ACCESS_OK_TYPE */

	/* posix_acl has refcount_t */
	/* #undef HAVE_ACL_REFCOUNT */

	/* Define if host toolchain supports AES */
	#define HAVE_AES 1

	#ifdef __amd64__
	#ifndef RESCUE
	/* Define if host toolchain supports AVX */
	#define HAVE_AVX 1
	#endif

	/* Define if host toolchain supports AVX2 */
	#define HAVE_AVX2 1

	/* Define if host toolchain supports AVX512BW */
	#define HAVE_AVX512BW 1

	/* Define if host toolchain supports AVX512CD */
	#define HAVE_AVX512CD 1

	/* Define if host toolchain supports AVX512DQ */
	#define HAVE_AVX512DQ 1

	/* Define if host toolchain supports AVX512ER */
	#define HAVE_AVX512ER 1

	/* Define if host toolchain supports AVX512F */
	#define HAVE_AVX512F 1

	/* Define if host toolchain supports AVX512IFMA */
	#define HAVE_AVX512IFMA 1

	/* Define if host toolchain supports AVX512PF */
	#define HAVE_AVX512PF 1

	/* Define if host toolchain supports AVX512VBMI */
	#define HAVE_AVX512VBMI 1

	/* Define if host toolchain supports AVX512VL */
	#define HAVE_AVX512VL 1
	#endif

	/* bdev_check_media_change() exists */
	/* #undef HAVE_BDEV_CHECK_MEDIA_CHANGE */

	/* bdev_whole() is available */
	/* #undef HAVE_BDEV_WHOLE */

	/* bio->bi_bdev->bd_disk exists */
	/* #undef HAVE_BIO_BDEV_DISK */

	/* bio->bi_opf is defined */
	/* #undef HAVE_BIO_BI_OPF */

	/* bio->bi_status exists */
	/* #undef HAVE_BIO_BI_STATUS */

	/* bio has bi_iter */
	/* #undef HAVE_BIO_BVEC_ITER */

	/* bio__io_acct() available /
	/* #undef HAVE_BIO_IO_ACCT */

	/* bio_max_segs() is implemented */
	/* #undef HAVE_BIO_MAX_SEGS */

	/* bio_set_dev() is available */
	/* #undef HAVE_BIO_SET_DEV */

	/* bio_set_dev() GPL-only */
	/* #undef HAVE_BIO_SET_DEV_GPL_ONLY */

	/* bio_set_op_attrs is available */
	/* #undef HAVE_BIO_SET_OP_ATTRS */

	/* blkdev_reread_part() exists */
	/* #undef HAVE_BLKDEV_REREAD_PART */

	/* blkg_tryget() is available */
	/* #undef HAVE_BLKG_TRYGET */

	/* blkg_tryget() GPL-only */
	/* #undef HAVE_BLKG_TRYGET_GPL_ONLY */

	+/* blk_alloc_disk() exists */
	+/* #undef HAVE_BLK_ALLOC_DISK */
	+
	/* blk_alloc_queue() expects request function */
	/* #undef HAVE_BLK_ALLOC_QUEUE_REQUEST_FN */

	/* blk_alloc_queue_rh() expects request function */
	/* #undef HAVE_BLK_ALLOC_QUEUE_REQUEST_FN_RH */

	/* blk queue backing_dev_info is dynamic */
	/* #undef HAVE_BLK_QUEUE_BDI_DYNAMIC */

	/* blk_queue_flag_clear() exists */
	/* #undef HAVE_BLK_QUEUE_FLAG_CLEAR */

	/* blk_queue_flag_set() exists */
	/* #undef HAVE_BLK_QUEUE_FLAG_SET */

	/* blk_queue_flush() is available */
	/* #undef HAVE_BLK_QUEUE_FLUSH */

	/* blk_queue_flush() is GPL-only */
	/* #undef HAVE_BLK_QUEUE_FLUSH_GPL_ONLY */

	/* blk_queue_secdiscard() is available */
	/* #undef HAVE_BLK_QUEUE_SECDISCARD */

	/* blk_queue_secure_erase() is available */
	/* #undef HAVE_BLK_QUEUE_SECURE_ERASE */

	+/* blk_queue_update_readahead() exists */
	+/* #undef HAVE_BLK_QUEUE_UPDATE_READAHEAD */
	+
	/* blk_queue_write_cache() exists */
	/* #undef HAVE_BLK_QUEUE_WRITE_CACHE */

	/* blk_queue_write_cache() is GPL-only */
	/* #undef HAVE_BLK_QUEUE_WRITE_CACHE_GPL_ONLY */

	/* Define if revalidate_disk() in block_device_operations */
	/* #undef HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK */

	/* Define to 1 if you have the Mac OS X function CFLocaleCopyCurrent in the
	CoreFoundation framework. */
	/* #undef HAVE_CFLOCALECOPYCURRENT */

	/* Define to 1 if you have the Mac OS X function
	CFLocaleCopyPreferredLanguages in the CoreFoundation framework. */
	/* #undef HAVE_CFLOCALECOPYPREFERREDLANGUAGES */

	/* Define to 1 if you have the Mac OS X function CFPreferencesCopyAppValue in
	the CoreFoundation framework. */
	/* #undef HAVE_CFPREFERENCESCOPYAPPVALUE */

	/* check_disk_change() exists */
	/* #undef HAVE_CHECK_DISK_CHANGE */

	/* clear_inode() is available */
	/* #undef HAVE_CLEAR_INODE */

	/* dentry uses const struct dentry_operations */
	/* #undef HAVE_CONST_DENTRY_OPERATIONS */

	/* copy_from_iter() is available */
	/* #undef HAVE_COPY_FROM_ITER */

	/* copy_to_iter() is available */
	/* #undef HAVE_COPY_TO_ITER */

	/* yes */
	/* #undef HAVE_CPU_HOTPLUG */

	/* current_time() exists */
	/* #undef HAVE_CURRENT_TIME */

	/* Define if the GNU dcgettext() function is already present or preinstalled.
	*/
	/* #undef HAVE_DCGETTEXT */

	/* DECLARE_EVENT_CLASS() is available */
	/* #undef HAVE_DECLARE_EVENT_CLASS */

	/* lookup_bdev() wants dev_t arg */
	/* #undef HAVE_DEVT_LOOKUP_BDEV */

	/* sops->dirty_inode() wants flags */
	/* #undef HAVE_DIRTY_INODE_WITH_FLAGS */

	/* disk__io_acct() available /
	/* #undef HAVE_DISK_IO_ACCT */

	+/* disk_update_readahead() exists */
	+/* #undef HAVE_DISK_UPDATE_READAHEAD */
	+
	/* Define to 1 if you have the <dlfcn.h> header file. */
	#define HAVE_DLFCN_H 1

	/* d_make_root() is available */
	/* #undef HAVE_D_MAKE_ROOT */

	/* d_prune_aliases() is available */
	/* #undef HAVE_D_PRUNE_ALIASES */

	/* dops->d_revalidate() operation takes nameidata */
	/* #undef HAVE_D_REVALIDATE_NAMEIDATA */

	/* eops->encode_fh() wants child and parent inodes */
	/* #undef HAVE_ENCODE_FH_WITH_INODE */

	/* sops->evict_inode() exists */
	/* #undef HAVE_EVICT_INODE */

	/* fops->aio_fsync() exists */
	/* #undef HAVE_FILE_AIO_FSYNC */

	/* file_dentry() is available */
	/* #undef HAVE_FILE_DENTRY */

	/* file_inode() is available */
	/* #undef HAVE_FILE_INODE */

	/* iops->follow_link() cookie */
	/* #undef HAVE_FOLLOW_LINK_COOKIE */

	/* iops->follow_link() nameidata */
	/* #undef HAVE_FOLLOW_LINK_NAMEIDATA */

	/* fops->fsync() with range */
	/* #undef HAVE_FSYNC_RANGE */

	/* fops->fsync() without dentry */
	/* #undef HAVE_FSYNC_WITHOUT_DENTRY */

	/* generic_fillattr requires struct user_namespace* */
	/* #undef HAVE_GENERIC_FILLATTR_USERNS */

	/* generic__io_acct() 3 arg available /
	/* #undef HAVE_GENERIC_IO_ACCT_3ARG */

	/* generic__io_acct() 4 arg available /
	/* #undef HAVE_GENERIC_IO_ACCT_4ARG */

	/* generic_readlink is global */
	/* #undef HAVE_GENERIC_READLINK */

	/* generic_setxattr() exists */
	/* #undef HAVE_GENERIC_SETXATTR */

	/* generic_write_checks() takes kiocb */
	/* #undef HAVE_GENERIC_WRITE_CHECKS_KIOCB */

	/* Define if the GNU gettext() function is already present or preinstalled. */
	/* #undef HAVE_GETTEXT */

	+/* iops->get_acl() exists */
	+/* #undef HAVE_GET_ACL */
	+
	+/* iops->get_acl() takes rcu */
	+/* #undef HAVE_GET_ACL_RCU */
	+
	/* iops->get_link() cookie */
	/* #undef HAVE_GET_LINK_COOKIE */

	/* iops->get_link() delayed */
	/* #undef HAVE_GET_LINK_DELAYED */

	/* group_info->gid exists */
	/* #undef HAVE_GROUP_INFO_GID */

	/* has_capability() is available */
	/* #undef HAVE_HAS_CAPABILITY */

	/* Define if you have the iconv() function and it works. */
	#define HAVE_ICONV 1

	/* yes */
	/* #undef HAVE_INODE_LOCK_SHARED */

	/* inode_owner_or_capable() exists */
	/* #undef HAVE_INODE_OWNER_OR_CAPABLE */

	/* inode_owner_or_capable() takes user_ns */
	/* #undef HAVE_INODE_OWNER_OR_CAPABLE_IDMAPPED */

	/* inode_set_flags() exists */
	/* #undef HAVE_INODE_SET_FLAGS */

	/* inode_set_iversion() exists */
	/* #undef HAVE_INODE_SET_IVERSION */

	/* inode->i_time's are timespec64 /
	/* #undef HAVE_INODE_TIMESPEC64_TIMES */

	/* timestamp_truncate() exists */
	/* #undef HAVE_INODE_TIMESTAMP_TRUNCATE */

	/* Define to 1 if you have the <inttypes.h> header file. */
	#define HAVE_INTTYPES_H 1

	/* in_compat_syscall() is available */
	/* #undef HAVE_IN_COMPAT_SYSCALL */

	/* iops->create() takes struct user_namespace* */
	/* #undef HAVE_IOPS_CREATE_USERNS */

	/* iops->mkdir() takes struct user_namespace* */
	/* #undef HAVE_IOPS_MKDIR_USERNS */

	/* iops->mknod() takes struct user_namespace* */
	/* #undef HAVE_IOPS_MKNOD_USERNS */

	/* iops->rename() takes struct user_namespace* */
	/* #undef HAVE_IOPS_RENAME_USERNS */

	/* iops->symlink() takes struct user_namespace* */
	/* #undef HAVE_IOPS_SYMLINK_USERNS */

	/* iov_iter_advance() is available */
	/* #undef HAVE_IOV_ITER_ADVANCE */

	/* iov_iter_count() is available */
	/* #undef HAVE_IOV_ITER_COUNT */

	/* iov_iter_fault_in_readable() is available */
	/* #undef HAVE_IOV_ITER_FAULT_IN_READABLE */

	-/* iov_iter_init() is available */
	-/* #undef HAVE_IOV_ITER_INIT */
	-
	-/* iov_iter_init() is available */
	-/* #undef HAVE_IOV_ITER_INIT_LEGACY */
	-
	/* iov_iter_revert() is available */
	/* #undef HAVE_IOV_ITER_REVERT */

	/* iov_iter types are available */
	/* #undef HAVE_IOV_ITER_TYPES */

	/* yes */
	/* #undef HAVE_IO_SCHEDULE_TIMEOUT */

	/* Define to 1 if you have the `issetugid' function. */
	#define HAVE_ISSETUGID 1

	/* kernel has kernel_fpu_* functions */
	/* #undef HAVE_KERNEL_FPU */

	/* kernel has asm/fpu/api.h */
	/* #undef HAVE_KERNEL_FPU_API_HEADER */

	/* kernel fpu internal */
	/* #undef HAVE_KERNEL_FPU_INTERNAL */

	/* uncached_acl_sentinel() exists */
	/* #undef HAVE_KERNEL_GET_ACL_HANDLE_CACHE */

	/* kernel does stack verification */
	/* #undef HAVE_KERNEL_OBJTOOL */

	/* kernel has linux/objtool.h */
	/* #undef HAVE_KERNEL_OBJTOOL_HEADER */

	/* kernel_read() take loff_t pointer */
	/* #undef HAVE_KERNEL_READ_PPOS */

	/* timer_list.function gets a timer_list */
	/* #undef HAVE_KERNEL_TIMER_FUNCTION_TIMER_LIST */

	/* struct timer_list has a flags member */
	/* #undef HAVE_KERNEL_TIMER_LIST_FLAGS */

	/* timer_setup() is available */
	/* #undef HAVE_KERNEL_TIMER_SETUP */

	/* kernel_write() take loff_t pointer */
	/* #undef HAVE_KERNEL_WRITE_PPOS */

	/* kmem_cache_create_usercopy() exists */
	/* #undef HAVE_KMEM_CACHE_CREATE_USERCOPY */

	/* kstrtoul() exists */
	/* #undef HAVE_KSTRTOUL */

	/* ktime_get_coarse_real_ts64() exists */
	/* #undef HAVE_KTIME_GET_COARSE_REAL_TS64 */

	/* ktime_get_raw_ts64() exists */
	/* #undef HAVE_KTIME_GET_RAW_TS64 */

	/* kvmalloc exists */
	/* #undef HAVE_KVMALLOC */

	/* kernel has large stacks */
	/* #undef HAVE_LARGE_STACKS */

	/* Define if you have [aio] */
	/* #undef HAVE_LIBAIO */

	/* Define if you have [blkid] */
	/* #undef HAVE_LIBBLKID */

	/* Define if you have [crypto] */
	#define HAVE_LIBCRYPTO 1

	/* Define if you have [tirpc] */
	/* #undef HAVE_LIBTIRPC */

	/* Define if you have [udev] */
	/* #undef HAVE_LIBUDEV */

	/* Define if you have [uuid] */
	/* #undef HAVE_LIBUUID */

	/* lseek_execute() is available */
	/* #undef HAVE_LSEEK_EXECUTE */

	/* makedev() is declared in sys/mkdev.h */
	/* #undef HAVE_MAKEDEV_IN_MKDEV */

	/* makedev() is declared in sys/sysmacros.h */
	/* #undef HAVE_MAKEDEV_IN_SYSMACROS */

	/* Noting that make_request_fn() returns blk_qc_t */
	/* #undef HAVE_MAKE_REQUEST_FN_RET_QC */

	/* Noting that make_request_fn() returns void */
	/* #undef HAVE_MAKE_REQUEST_FN_RET_VOID */

	/* Define to 1 if you have the <memory.h> header file. */
	#define HAVE_MEMORY_H 1

	/* iops->mkdir() takes umode_t */
	/* #undef HAVE_MKDIR_UMODE_T */

	/* Define to 1 if you have the `mlockall' function. */
	#define HAVE_MLOCKALL 1

	/* lookup_bdev() wants mode arg */
	/* #undef HAVE_MODE_LOOKUP_BDEV */

	/* Define if host toolchain supports MOVBE */
	#define HAVE_MOVBE 1

	/* new_sync_read()/new_sync_write() are available */
	/* #undef HAVE_NEW_SYNC_READ */

	/* iops->getattr() takes a path */
	/* #undef HAVE_PATH_IOPS_GETATTR */

	/* Define if host toolchain supports PCLMULQDQ */
	#define HAVE_PCLMULQDQ 1

	/* percpu_counter_add_batch() is defined */
	/* #undef HAVE_PERCPU_COUNTER_ADD_BATCH */

	/* percpu_counter_init() wants gfp_t */
	/* #undef HAVE_PERCPU_COUNTER_INIT_WITH_GFP */

	/* posix_acl_chmod() exists */
	/* #undef HAVE_POSIX_ACL_CHMOD */

	/* posix_acl_from_xattr() needs user_ns */
	/* #undef HAVE_POSIX_ACL_FROM_XATTR_USERNS */

	/* posix_acl_release() is available */
	/* #undef HAVE_POSIX_ACL_RELEASE */

	/* posix_acl_release() is GPL-only */
	/* #undef HAVE_POSIX_ACL_RELEASE_GPL_ONLY */

	/* posix_acl_valid() wants user namespace */
	/* #undef HAVE_POSIX_ACL_VALID_WITH_NS */

	/* proc_ops structure exists */
	/* #undef HAVE_PROC_OPS_STRUCT */

	/* iops->put_link() cookie */
	/* #undef HAVE_PUT_LINK_COOKIE */

	/* iops->put_link() delayed */
	/* #undef HAVE_PUT_LINK_DELAYED */

	/* iops->put_link() nameidata */
	/* #undef HAVE_PUT_LINK_NAMEIDATA */

	/* If available, contains the Python version number currently in use. */
	#define HAVE_PYTHON "3.7"

	/* qat is enabled and existed */
	/* #undef HAVE_QAT */

	/* iops->rename() wants flags */
	/* #undef HAVE_RENAME_WANTS_FLAGS */

	/* REQ_DISCARD is defined */
	/* #undef HAVE_REQ_DISCARD */

	/* REQ_FLUSH is defined */
	/* #undef HAVE_REQ_FLUSH */

	/* REQ_OP_DISCARD is defined */
	/* #undef HAVE_REQ_OP_DISCARD */

	/* REQ_OP_FLUSH is defined */
	/* #undef HAVE_REQ_OP_FLUSH */

	/* REQ_OP_SECURE_ERASE is defined */
	/* #undef HAVE_REQ_OP_SECURE_ERASE */

	/* REQ_PREFLUSH is defined */
	/* #undef HAVE_REQ_PREFLUSH */

	/* revalidate_disk() is available */
	/* #undef HAVE_REVALIDATE_DISK */

	/* revalidate_disk_size() is available */
	/* #undef HAVE_REVALIDATE_DISK_SIZE */

	/* struct rw_semaphore has member activity */
	/* #undef HAVE_RWSEM_ACTIVITY */

	/* struct rw_semaphore has atomic_long_t member count */
	/* #undef HAVE_RWSEM_ATOMIC_LONG_COUNT */

	/* linux/sched/signal.h exists */
	/* #undef HAVE_SCHED_SIGNAL_HEADER */

	/* Define to 1 if you have the <security/pam_modules.h> header file. */
	#define HAVE_SECURITY_PAM_MODULES_H 1

	/* setattr_prepare() is available, doesn't accept user_namespace */
	/* #undef HAVE_SETATTR_PREPARE_NO_USERNS */

	/* setattr_prepare() accepts user_namespace */
	/* #undef HAVE_SETATTR_PREPARE_USERNS */

	/* iops->set_acl() exists, takes 3 args */
	/* #undef HAVE_SET_ACL */

	/* iops->set_acl() takes 4 args */
	/* #undef HAVE_SET_ACL_USERNS */

	/* set_cached_acl() is usable */
	/* #undef HAVE_SET_CACHED_ACL_USABLE */

	/* set_special_state() exists */
	/* #undef HAVE_SET_SPECIAL_STATE */

	/* struct shrink_control exists */
	/* #undef HAVE_SHRINK_CONTROL_STRUCT */

	/* kernel_siginfo_t exists */
	/* #undef HAVE_SIGINFO */

	/* signal_stop() exists */
	/* #undef HAVE_SIGNAL_STOP */

	/* new shrinker callback wants 2 args */
	/* #undef HAVE_SINGLE_SHRINKER_CALLBACK */

	/* ->count_objects exists */
	/* #undef HAVE_SPLIT_SHRINKER_CALLBACK */

	#if defined(__amd64__) \|\| defined(__i386__)
	/* Define if host toolchain supports SSE */
	#define HAVE_SSE 1

	/* Define if host toolchain supports SSE2 */
	#define HAVE_SSE2 1

	/* Define if host toolchain supports SSE3 */
	#define HAVE_SSE3 1

	/* Define if host toolchain supports SSE4.1 */
	#define HAVE_SSE4_1 1

	/* Define if host toolchain supports SSE4.2 */
	#define HAVE_SSE4_2 1

	/* Define if host toolchain supports SSSE3 */
	#define HAVE_SSSE3 1
	#endif

	/* STACK_FRAME_NON_STANDARD is defined */
	/* #undef HAVE_STACK_FRAME_NON_STANDARD */

	+/* standalone <linux/stdarg.h> exists */
	+/* #undef HAVE_STANDALONE_LINUX_STDARG */
	+
	/* Define to 1 if you have the <stdint.h> header file. */
	#define HAVE_STDINT_H 1

	/* Define to 1 if you have the <stdlib.h> header file. */
	#define HAVE_STDLIB_H 1

	/* Define to 1 if you have the <strings.h> header file. */
	#define HAVE_STRINGS_H 1

	/* Define to 1 if you have the <string.h> header file. */
	#define HAVE_STRING_H 1

	/* Define to 1 if you have the `strlcat' function. */
	#define HAVE_STRLCAT 1

	/* Define to 1 if you have the `strlcpy' function. */
	#define HAVE_STRLCPY 1

	/* submit_bio is member of struct block_device_operations */
	/* #undef HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS */

	/* super_setup_bdi_name() exits */
	/* #undef HAVE_SUPER_SETUP_BDI_NAME */

	/* super_block->s_user_ns exists */
	/* #undef HAVE_SUPER_USER_NS */

	/* Define to 1 if you have the <sys/stat.h> header file. */
	#define HAVE_SYS_STAT_H 1

	/* Define to 1 if you have the <sys/types.h> header file. */
	#define HAVE_SYS_TYPES_H 1

	/* i_op->tmpfile() exists */
	/* #undef HAVE_TMPFILE */

	/* i_op->tmpfile() has userns */
	/* #undef HAVE_TMPFILE_USERNS */

	/* totalhigh_pages() exists */
	/* #undef HAVE_TOTALHIGH_PAGES */

	/* kernel has totalram_pages() */
	/* #undef HAVE_TOTALRAM_PAGES_FUNC */

	/* Define to 1 if you have the `udev_device_get_is_initialized' function. */
	/* #undef HAVE_UDEV_DEVICE_GET_IS_INITIALIZED */

	/* kernel has __kernel_fpu_* functions */
	/* #undef HAVE_UNDERSCORE_KERNEL_FPU */

	/* Define to 1 if you have the <unistd.h> header file. */
	#define HAVE_UNISTD_H 1

	/* iops->getattr() takes struct user_namespace* */
	/* #undef HAVE_USERNS_IOPS_GETATTR */

	/* iops->getattr() takes a vfsmount */
	/* #undef HAVE_VFSMOUNT_IOPS_GETATTR */

	/* aops->direct_IO() uses iovec */
	/* #undef HAVE_VFS_DIRECT_IO_IOVEC */

	/* aops->direct_IO() uses iov_iter without rw */
	/* #undef HAVE_VFS_DIRECT_IO_ITER */

	/* aops->direct_IO() uses iov_iter with offset */
	/* #undef HAVE_VFS_DIRECT_IO_ITER_OFFSET */

	/* aops->direct_IO() uses iov_iter with rw and offset */
	/* #undef HAVE_VFS_DIRECT_IO_ITER_RW_OFFSET */

	/* All required iov_iter interfaces are available */
	/* #undef HAVE_VFS_IOV_ITER */

	/* fops->iterate() is available */
	/* #undef HAVE_VFS_ITERATE */

	/* fops->iterate_shared() is available */
	/* #undef HAVE_VFS_ITERATE_SHARED */

	/* fops->readdir() is available */
	/* #undef HAVE_VFS_READDIR */

	/* fops->read/write_iter() are available */
	/* #undef HAVE_VFS_RW_ITERATE */

	+/* __set_page_dirty_nobuffers exists */
	+/* #undef HAVE_VFS_SET_PAGE_DIRTY_NOBUFFERS */
	+
	/* __vmalloc page flags exists */
	/* #undef HAVE_VMALLOC_PAGE_KERNEL */

	/* yes */
	/* #undef HAVE_WAIT_ON_BIT_ACTION */

	/* wait_queue_entry_t exists */
	/* #undef HAVE_WAIT_QUEUE_ENTRY_T */

	/* wq_head->head and wq_entry->entry exist */
	/* #undef HAVE_WAIT_QUEUE_HEAD_ENTRY */

	/* xattr_handler->get() wants dentry */
	/* #undef HAVE_XATTR_GET_DENTRY */

	/* xattr_handler->get() wants both dentry and inode */
	/* #undef HAVE_XATTR_GET_DENTRY_INODE */

	/* xattr_handler->get() wants xattr_handler */
	/* #undef HAVE_XATTR_GET_HANDLER */

	/* xattr_handler has name */
	/* #undef HAVE_XATTR_HANDLER_NAME */

	/* xattr_handler->list() wants dentry */
	/* #undef HAVE_XATTR_LIST_DENTRY */

	/* xattr_handler->list() wants xattr_handler */
	/* #undef HAVE_XATTR_LIST_HANDLER */

	/* xattr_handler->list() wants simple */
	/* #undef HAVE_XATTR_LIST_SIMPLE */

	/* xattr_handler->set() wants dentry */
	/* #undef HAVE_XATTR_SET_DENTRY */

	/* xattr_handler->set() wants both dentry and inode */
	/* #undef HAVE_XATTR_SET_DENTRY_INODE */

	/* xattr_handler->set() wants xattr_handler */
	/* #undef HAVE_XATTR_SET_HANDLER */

	/* xattr_handler->set() takes user_namespace */
	/* #undef HAVE_XATTR_SET_USERNS */

	/* Define if you have [z] */
	#define HAVE_ZLIB 1

	/* __posix_acl_chmod() exists */
	/* #undef HAVE___POSIX_ACL_CHMOD */

	/* kernel exports FPU functions */
	/* #undef KERNEL_EXPORTS_X86_FPU */

	-/* TBD: fetch(3) support */
	-#if 0
	-/* whether the chosen libfetch is to be loaded at run-time */
	-#define LIBFETCH_DYNAMIC 1
	-
	-/* libfetch is fetch(3) */
	-#define LIBFETCH_IS_FETCH 1
	-
	-/* libfetch is libcurl */
	-#define LIBFETCH_IS_LIBCURL 0
	-
	-/* soname of chosen libfetch */
	-#define LIBFETCH_SONAME "libfetch.so.6"
	-#endif
	-
	/* Define to the sub-directory where libtool stores uninstalled libraries. */
	#define LT_OBJDIR ".libs/"

	/* make_request_fn() return type */
	/* #undef MAKE_REQUEST_FN_RET */

	/* hardened module_param_call */
	/* #undef MODULE_PARAM_CALL_CONST */

	/* struct shrink_control has nid */
	/* #undef SHRINK_CONTROL_HAS_NID */

	/* Defined for legacy compatibility. */
	#define SPL_META_ALIAS ZFS_META_ALIAS

	/* Defined for legacy compatibility. */
	#define SPL_META_RELEASE ZFS_META_RELEASE

	/* Defined for legacy compatibility. */
	#define SPL_META_VERSION ZFS_META_VERSION

	/* True if ZFS is to be compiled for a FreeBSD system */
	#define SYSTEM_FREEBSD 1

	/* True if ZFS is to be compiled for a Linux system */
	/* #undef SYSTEM_LINUX */

	/* zfs debugging enabled */
	/* #undef ZFS_DEBUG */

	/* /dev/zfs minor */
	/* #undef ZFS_DEVICE_MINOR */

	/* enum node_stat_item contains NR_FILE_PAGES */
	/* #undef ZFS_ENUM_NODE_STAT_ITEM_NR_FILE_PAGES */

	/* enum node_stat_item contains NR_INACTIVE_ANON */
	/* #undef ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_ANON */

	/* enum node_stat_item contains NR_INACTIVE_FILE */
	/* #undef ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_FILE */

	/* enum zone_stat_item contains NR_FILE_PAGES */
	/* #undef ZFS_ENUM_ZONE_STAT_ITEM_NR_FILE_PAGES */

	/* enum zone_stat_item contains NR_INACTIVE_ANON */
	/* #undef ZFS_ENUM_ZONE_STAT_ITEM_NR_INACTIVE_ANON */

	/* enum zone_stat_item contains NR_INACTIVE_FILE */
	/* #undef ZFS_ENUM_ZONE_STAT_ITEM_NR_INACTIVE_FILE */

	/* global_node_page_state() exists */
	/* #undef ZFS_GLOBAL_NODE_PAGE_STATE */

	/* global_zone_page_state() exists */
	/* #undef ZFS_GLOBAL_ZONE_PAGE_STATE */

	/* Define to 1 if GPL-only symbols can be used */
	/* #undef ZFS_IS_GPL_COMPATIBLE */

	/* Define the project alias string. */
	-#define ZFS_META_ALIAS "zfs-2.1.0-FreeBSD_g4f92fe0f5"
	+#define ZFS_META_ALIAS "zfs-2.1.1-FreeBSD_g71c609852"

	/* Define the project author. */
	#define ZFS_META_AUTHOR "OpenZFS"

	/* Define the project release date. */
	/* #undef ZFS_META_DATA */

	/* Define the maximum compatible kernel version. */
	-#define ZFS_META_KVER_MAX "5.13"
	+#define ZFS_META_KVER_MAX "5.14"

	/* Define the minimum compatible kernel version. */
	#define ZFS_META_KVER_MIN "3.10"

	/* Define the project license. */
	#define ZFS_META_LICENSE "CDDL"

	/* Define the libtool library 'age' version information. */
	/* #undef ZFS_META_LT_AGE */

	/* Define the libtool library 'current' version information. */
	/* #undef ZFS_META_LT_CURRENT */

	/* Define the libtool library 'revision' version information. */
	/* #undef ZFS_META_LT_REVISION */

	/* Define the project name. */
	#define ZFS_META_NAME "zfs"

	/* Define the project release. */
	-#define ZFS_META_RELEASE "FreeBSD_g4f92fe0f5"
	+#define ZFS_META_RELEASE "FreeBSD_g71c609852"

	/* Define the project version. */
	-#define ZFS_META_VERSION "2.1.0"
	+#define ZFS_META_VERSION "2.1.1"

	/* count is located in percpu_ref.data */
	/* #undef ZFS_PERCPU_REF_COUNT_IN_DATA */

	diff --git a/sys/modules/zfs/zfs_gitrev.h b/sys/modules/zfs/zfs_gitrev.h
	index 6fd7c8f8fd18..cbaa4c41658b 100644
	--- a/sys/modules/zfs/zfs_gitrev.h
	+++ b/sys/modules/zfs/zfs_gitrev.h
	@@ -1,5 +1,5 @@
	/*
	* $FreeBSD$
	*/

	-#define ZFS_META_GITREV "zfs-2.1.0-0-g4f92fe0f5"
	+#define ZFS_META_GITREV "zfs-2.1.1-0-g71c609852"

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