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diff --git a/etc/mtree/BSD.tests.dist b/etc/mtree/BSD.tests.dist
--- a/etc/mtree/BSD.tests.dist
+++ b/etc/mtree/BSD.tests.dist
@@ -834,6 +834,8 @@
fs
fusefs
..
+ nfs
+ ..
pjdfstest
..
tarfs
diff --git a/tests/sys/fs/Makefile b/tests/sys/fs/Makefile
--- a/tests/sys/fs/Makefile
+++ b/tests/sys/fs/Makefile
@@ -12,6 +12,7 @@
.if ${COMPILER_FEATURES:Mc++14} && ${MK_GOOGLETEST} != "no"
TESTS_SUBDIRS+= fusefs
.endif
+TESTS_SUBDIRS+= nfs
TESTS_SUBDIRS+= pjdfstest
TESTS_SUBDIRS+= tarfs
TESTS_SUBDIRS+= tmpfs
diff --git a/tests/sys/fs/nfs/Makefile b/tests/sys/fs/nfs/Makefile
new file mode 100644
--- /dev/null
+++ b/tests/sys/fs/nfs/Makefile
@@ -0,0 +1,8 @@
+PACKAGE= tests
+
+TESTSDIR= ${TESTSBASE}/sys/fs/nfs
+BINDIR= ${TESTSDIR}
+
+ATF_TESTS_SH+= nfs_test
+
+.include <bsd.test.mk>
diff --git a/tests/sys/fs/nfs/nfs_test.sh b/tests/sys/fs/nfs/nfs_test.sh
new file mode 100644
--- /dev/null
+++ b/tests/sys/fs/nfs/nfs_test.sh
@@ -0,0 +1,199 @@
+#
+# Copyright (c) 2025 Dag-Erling Smørgrav
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+
+. $(atf_get_srcdir)/../../common/vnet.subr
+
+nfs_jail() {
+ local name=$1
+ local path=$2
+ local iface=$3
+ local cidr=$4
+ local f
+
+ # Create directory hierarchy
+ mkdir -p "${path}"
+ atf_check mount -t tmpfs tmpfs "${path}"
+ atf_check -o ignore \
+ mtree -deqU -f /etc/mtree/BSD.root.dist -p "${path}"
+ atf_check -o ignore \
+ mtree -deqU -f /etc/mtree/BSD.usr.dist -p "${path}"/usr
+ atf_check -o ignore \
+ mtree -deqU -f /etc/mtree/BSD.var.dist -p "${path}"/var
+ # Copy minimal system
+ tar cf - -C / --no-fflags \
+ --exclude debug --exclude '*clang*' --exclude '*llvm*' \
+ bin lib libexec usr/bin sbin usr/lib usr/libexec usr/sbin |
+ atf_check tar xf - -C "${path}"
+ # Grab stock versions of etc files
+ for f in group master.passwd netconfig rpc services ; do
+ atf_check cp -p /var/db/etcupdate/current/etc/$f \
+ "${path}"/etc/$f
+ done
+ # Create the jail
+ atf_check jail -c name="${name}" path="${path}" persist \
+ allow.mount allow.mount.devfs allow.mount.tmpfs allow.mount.nfs \
+ allow.nfsd enforce_statfs=1 vnet vnet.interface="${iface}" \
+ host.hostname="${name}"
+ unlist_interface "${iface}"
+ atf_check jexec "${name}" mount -t devfs devfs /dev
+ atf_check jexec "${name}" pwd_mkdb /etc/master.passwd
+ # Configure the jail's network
+ atf_check jexec "${name}" ifconfig lo0 inet 127.0.0.1/8
+ atf_check jexec "${name}" ifconfig "${iface}" inet "${cidr}" up
+ cat >/etc/hosts <<EOF
+192.0.2.1 nfsd.local nfsd
+192.0.2.2 nfscl.local nfscl
+EOF
+ # Start syslogd to facilitate troubleshooting
+ cat >"${path}"/etc/syslog.conf <<EOF
+*.* /var/log/messages
+EOF
+ :> "${path}"/var/log/messages
+ atf_check jexec "${name}" syslogd -ss
+ # Start rpcbind
+ atf_check jexec "${name}" rpcbind
+}
+
+nfs_setup() {
+ local proto=$1
+
+ vnet_init
+ local epair=$(vnet_mkepair)
+
+ # Create the server jail
+ nfs_jail nfsd nfsd ${epair}a 192.0.2.1/24
+ # Start mountd in server jail
+ echo "V4: /" >nfsd/etc/exports
+ atf_check jexec nfsd mountd /etc/exports
+ # Start nfsd in server jail
+ # RPC over UDP is currently not permitted in jails
+ atf_check jexec nfsd nfsd -t
+
+ # In the server jail, create a mountpoint, mount a tmpfs, and
+ # export it
+ atf_check mkdir nfsd/exp
+ atf_check jexec nfsd mount -t tmpfs tmpfs /exp
+ atf_check jexec nfsd sed -i '' -e 'i\
+/exp -maproot=root -network=192.0.2.0/24' /etc/exports
+ atf_check jexec nfsd pkill -HUP mountd
+
+ # Create the client jail
+ nfs_jail nfscl nfscl ${epair}b 192.0.2.2/24
+
+ # In the client jail, create a mountpoint and mount the
+ # exported file system
+ atf_check mkdir nfscl/imp
+ atf_check jexec nfscl mount -o ${proto} -t nfs 192.0.2.1:/exp /imp
+
+}
+
+nfs_test() {
+ # Create file on server, check on client
+ echo "Hello, world!" >hello.txt
+ cp hello.txt nfsd/exp
+ atf_check -o file:hello.txt jexec nfscl cat /imp/hello.txt
+
+ # Create file on client, check on server
+ echo "The Magic Words are Squeamish Ossifrage" >magic.txt
+ cp magic.txt nfscl/imp
+ atf_check -o file:magic.txt jexec nfsd cat /exp/magic.txt
+
+ # Create directory on client, check on server
+ atf_check jexec nfscl mkdir /imp/dir
+ atf_check jexec nfsd test -d /exp/dir
+
+ # Create symbolic link on client, check on server
+ atf_check jexec nfscl ln -s ../magic.txt /imp/dir/link.txt
+ atf_check -o ignore jexec nfsd readlink /exp/dir/link.txt
+ atf_check -o file:magic.txt jexec nfsd cat /exp/dir/link.txt
+
+ # Create hard link on client, check on server
+ atf_check jexec nfscl ln -f /imp/hello.txt /imp/dir/link.txt
+ atf_check -s exit:1 jexec nfsd readlink /exp/dir/link.txt
+ atf_check -o file:hello.txt jexec nfsd cat /exp/dir/link.txt
+
+ # Rename file on client, check on server
+ atf_check jexec nfscl mv /imp/hello.txt /imp/world.txt
+ atf_check -o file:hello.txt jexec nfsd cat /exp/world.txt
+
+ # Delete file on client, check on server
+ atf_check jexec nfscl rm /imp/dir/link.txt
+ atf_check -s exit:1 -e ignore jexec nfsd cat /exp/dir/link.txt
+
+ # Delete directory on client, check on server
+ atf_check jexec nfscl rmdir /imp/dir
+ atf_check -s exit:1 jexec nfsd test -d /exp/dir
+}
+
+nfs_cleanup() {
+ # Tear down the client jail
+ if [ -d nfscl ] ; then
+ jail -r nfscl || true
+ if [ -d nfscl/imp ] ; then
+ umount -f nfscl/imp || true
+ fi
+ umount -f nfscl/dev || true
+ umount -f nfscl || true
+ fi
+ # Tear down the server jail
+ if [ -d nfsd ] ; then
+ jail -r nfsd || true
+ if [ -d nfsd/exp ] ; then
+ umount -f nfsd/exp || true
+ fi
+ umount -f nfsd/dev || true
+ umount -f nfsd || true
+ fi
+ vnet_cleanup
+}
+
+atf_test_case nfsv2 cleanup
+nfsv2_head() {
+ atf_set "descr" "Basic NFSv2 function test"
+ atf_set "require.user" "root"
+ atf_set "require.kmods" "nfscl nfsd tmpfs"
+}
+nfsv2_body() {
+ nfs_setup nfsv2
+ nfs_test
+}
+nfsv2_cleanup() {
+ nfs_cleanup
+}
+
+atf_test_case nfsv3 cleanup
+nfsv3_head() {
+ atf_set "descr" "Basic NFSv3 function test"
+ atf_set "require.user" "root"
+ atf_set "require.kmods" "nfscl nfsd tmpfs"
+}
+nfsv3_body() {
+ nfs_setup nfsv3
+ nfs_test
+}
+nfsv3_cleanup() {
+ nfs_cleanup
+}
+
+atf_test_case nfsv4 cleanup
+nfsv4_head() {
+ atf_set "descr" "Basic NFSv4 function test"
+ atf_set "require.user" "root"
+ atf_set "require.kmods" "nfscl nfsd tmpfs"
+}
+nfsv4_body() {
+ nfs_setup nfsv4
+ nfs_test
+}
+nfsv4_cleanup() {
+ nfs_cleanup
+}
+
+atf_init_test_cases() {
+ atf_add_test_case nfsv2
+ atf_add_test_case nfsv3
+ atf_add_test_case nfsv4
+}

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