diff --git a/tests/sys/fs/fusefs/read.cc b/tests/sys/fs/fusefs/read.cc
index 839b42a897e9..0888fbc913e8 100644
--- a/tests/sys/fs/fusefs/read.cc
+++ b/tests/sys/fs/fusefs/read.cc
@@ -1,1366 +1,1366 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
  *
  * Copyright (c) 2019 The FreeBSD Foundation
  *
  * This software was developed by BFF Storage Systems, LLC under sponsorship
  * from the FreeBSD Foundation.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * $FreeBSD$
  */
 
 extern "C" {
 #include <sys/param.h>
 #include <sys/mman.h>
 #include <sys/socket.h>
 #include <sys/sysctl.h>
 #include <sys/uio.h>
 
 #include <aio.h>
 #include <fcntl.h>
 #include <semaphore.h>
 #include <setjmp.h>
 #include <signal.h>
 #include <unistd.h>
 }
 
 #include "mockfs.hh"
 #include "utils.hh"
 
 using namespace testing;
 
 class Read: public FuseTest {
 
 public:
 void expect_lookup(const char *relpath, uint64_t ino, uint64_t size)
 {
 	FuseTest::expect_lookup(relpath, ino, S_IFREG | 0644, size, 1);
 }
 };
 
 class Read_7_8: public FuseTest {
 public:
 virtual void SetUp() {
 	m_kernel_minor_version = 8;
 	FuseTest::SetUp();
 }
 
 void expect_lookup(const char *relpath, uint64_t ino, uint64_t size)
 {
 	FuseTest::expect_lookup_7_8(relpath, ino, S_IFREG | 0644, size, 1);
 }
 };
 
 class AioRead: public Read {
 public:
 virtual void SetUp() {
 	if (!is_unsafe_aio_enabled())
 		GTEST_SKIP() <<
 			"vfs.aio.enable_unsafe must be set for this test";
 	FuseTest::SetUp();
 }
 };
 
 class AsyncRead: public AioRead {
 	virtual void SetUp() {
 		m_init_flags = FUSE_ASYNC_READ;
 		AioRead::SetUp();
 	}
 };
 
 class ReadAhead: public Read,
 		 public WithParamInterface<tuple<bool, int>>
 {
 	virtual void SetUp() {
 		int val;
 		const char *node = "vfs.maxbcachebuf";
 		size_t size = sizeof(val);
 		ASSERT_EQ(0, sysctlbyname(node, &val, &size, NULL, 0))
 			<< strerror(errno);
 
 		m_maxreadahead = val * get<1>(GetParam());
 		m_noclusterr = get<0>(GetParam());
 		Read::SetUp();
 	}
 };
 
 class ReadNoatime: public Read {
 	virtual void SetUp() {
 		m_noatime = true;
 		Read::SetUp();
 	}
 };
 
 class ReadSigbus: public Read
 {
 public:
 static jmp_buf s_jmpbuf;
 static void *s_si_addr;
 
 void TearDown() {
 	struct sigaction sa;
 
 	bzero(&sa, sizeof(sa));
 	sa.sa_handler = SIG_DFL;
 	sigaction(SIGBUS, &sa, NULL);
 
 	FuseTest::TearDown();
 }
 
 };
 
 static void
 handle_sigbus(int signo __unused, siginfo_t *info, void *uap __unused) {
 	ReadSigbus::s_si_addr = info->si_addr;
 	longjmp(ReadSigbus::s_jmpbuf, 1);
 }
 
 jmp_buf ReadSigbus::s_jmpbuf;
 void *ReadSigbus::s_si_addr;
 
 class TimeGran: public Read, public WithParamInterface<unsigned> {
 public:
 virtual void SetUp() {
 	m_time_gran = 1 << GetParam();
 	Read::SetUp();
 }
 };
 
 /* AIO reads need to set the header's pid field correctly */
 /* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236379 */
 TEST_F(AioRead, aio_read)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 	struct aiocb iocb, *piocb;
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	iocb.aio_nbytes = bufsize;
 	iocb.aio_fildes = fd;
 	iocb.aio_buf = buf;
 	iocb.aio_offset = 0;
 	iocb.aio_sigevent.sigev_notify = SIGEV_NONE;
 	ASSERT_EQ(0, aio_read(&iocb)) << strerror(errno);
 	ASSERT_EQ(bufsize, aio_waitcomplete(&piocb, NULL)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 
 	leak(fd);
 }
 
 /* 
  * Without the FUSE_ASYNC_READ mount option, fuse(4) should ensure that there
  * is at most one outstanding read operation per file handle
  */
 TEST_F(AioRead, async_read_disabled)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = 50;
 	char buf0[bufsize], buf1[bufsize];
 	off_t off0 = 0;
 	off_t off1 = m_maxbcachebuf;
 	struct aiocb iocb0, iocb1;
 	volatile sig_atomic_t read_count = 0;
 
 	expect_lookup(RELPATH, ino, 131072);
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ &&
 				in.header.nodeid == ino &&
 				in.body.read.fh == FH &&
 				in.body.read.offset == (uint64_t)off0);
 		}, Eq(true)),
 		_)
 	).WillRepeatedly(Invoke([&](auto in __unused, auto &out __unused) {
 		read_count++;
 		/* Filesystem is slow to respond */
 	}));
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ &&
 				in.header.nodeid == ino &&
 				in.body.read.fh == FH &&
 				in.body.read.offset == (uint64_t)off1);
 		}, Eq(true)),
 		_)
 	).WillRepeatedly(Invoke([&](auto in __unused, auto &out __unused) {
 		read_count++;
 		/* Filesystem is slow to respond */
 	}));
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	/* 
 	 * Submit two AIO read requests, and respond to neither.  If the
 	 * filesystem ever gets the second read request, then we failed to
 	 * limit outstanding reads.
 	 */
 	iocb0.aio_nbytes = bufsize;
 	iocb0.aio_fildes = fd;
 	iocb0.aio_buf = buf0;
 	iocb0.aio_offset = off0;
 	iocb0.aio_sigevent.sigev_notify = SIGEV_NONE;
 	ASSERT_EQ(0, aio_read(&iocb0)) << strerror(errno);
 
 	iocb1.aio_nbytes = bufsize;
 	iocb1.aio_fildes = fd;
 	iocb1.aio_buf = buf1;
 	iocb1.aio_offset = off1;
 	iocb1.aio_sigevent.sigev_notify = SIGEV_NONE;
 	ASSERT_EQ(0, aio_read(&iocb1)) << strerror(errno);
 
 	/* 
 	 * Sleep for awhile to make sure the kernel has had a chance to issue
 	 * the second read, even though the first has not yet returned
 	 */
 	nap();
 	EXPECT_EQ(read_count, 1);
 	
 	m_mock->kill_daemon();
 	/* Wait for AIO activity to complete, but ignore errors */
 	(void)aio_waitcomplete(NULL, NULL);
 
 	leak(fd);
 }
 
 /* 
  * With the FUSE_ASYNC_READ mount option, fuse(4) may issue multiple
  * simultaneous read requests on the same file handle.
  */
 TEST_F(AsyncRead, async_read)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = 50;
 	char buf0[bufsize], buf1[bufsize];
 	off_t off0 = 0;
 	off_t off1 = m_maxbcachebuf;
 	off_t fsize = 2 * m_maxbcachebuf;
 	struct aiocb iocb0, iocb1;
 	sem_t sem;
 
 	ASSERT_EQ(0, sem_init(&sem, 0, 0)) << strerror(errno);
 
 	expect_lookup(RELPATH, ino, fsize);
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ &&
 				in.header.nodeid == ino &&
 				in.body.read.fh == FH &&
 				in.body.read.offset == (uint64_t)off0);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke([&](auto in __unused, auto &out __unused) {
 		sem_post(&sem);
 		/* Filesystem is slow to respond */
 	}));
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ &&
 				in.header.nodeid == ino &&
 				in.body.read.fh == FH &&
 				in.body.read.offset == (uint64_t)off1);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke([&](auto in __unused, auto &out __unused) {
 		sem_post(&sem);
 		/* Filesystem is slow to respond */
 	}));
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	/* 
 	 * Submit two AIO read requests, but respond to neither.  Ensure that
 	 * we received both.
 	 */
 	iocb0.aio_nbytes = bufsize;
 	iocb0.aio_fildes = fd;
 	iocb0.aio_buf = buf0;
 	iocb0.aio_offset = off0;
 	iocb0.aio_sigevent.sigev_notify = SIGEV_NONE;
 	ASSERT_EQ(0, aio_read(&iocb0)) << strerror(errno);
 
 	iocb1.aio_nbytes = bufsize;
 	iocb1.aio_fildes = fd;
 	iocb1.aio_buf = buf1;
 	iocb1.aio_offset = off1;
 	iocb1.aio_sigevent.sigev_notify = SIGEV_NONE;
 	ASSERT_EQ(0, aio_read(&iocb1)) << strerror(errno);
 
 	/* Wait until both reads have reached the daemon */
 	ASSERT_EQ(0, sem_wait(&sem)) << strerror(errno);
 	ASSERT_EQ(0, sem_wait(&sem)) << strerror(errno);
 
 	m_mock->kill_daemon();
 	/* Wait for AIO activity to complete, but ignore errors */
 	(void)aio_waitcomplete(NULL, NULL);
 	
 	leak(fd);
 }
 
 /* The kernel should update the cached atime attribute during a read */
 TEST_F(Read, atime)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	struct stat sb1, sb2;
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb1));
 
 	/* Ensure atime will be different than it was during lookup */
 	nap();
 
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb2));
 
 	/* The kernel should automatically update atime during read */
 	EXPECT_TRUE(timespeccmp(&sb1.st_atim, &sb2.st_atim, <));
 	EXPECT_TRUE(timespeccmp(&sb1.st_ctim, &sb2.st_ctim, ==));
 	EXPECT_TRUE(timespeccmp(&sb1.st_mtim, &sb2.st_mtim, ==));
 
 	leak(fd);
 }
 
 /* The kernel should update the cached atime attribute during a cached read */
 TEST_F(Read, atime_cached)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	struct stat sb1, sb2;
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(bufsize, pread(fd, buf, bufsize, 0)) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb1));
 
 	/* Ensure atime will be different than it was during the first read */
 	nap();
 
 	ASSERT_EQ(bufsize, pread(fd, buf, bufsize, 0)) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb2));
 
 	/* The kernel should automatically update atime during read */
 	EXPECT_TRUE(timespeccmp(&sb1.st_atim, &sb2.st_atim, <));
 	EXPECT_TRUE(timespeccmp(&sb1.st_ctim, &sb2.st_ctim, ==));
 	EXPECT_TRUE(timespeccmp(&sb1.st_mtim, &sb2.st_mtim, ==));
 
 	leak(fd);
 }
 
 /* dirty atime values should be flushed during close */
 TEST_F(Read, atime_during_close)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	struct stat sb;
 	uint64_t ino = 42;
 	const mode_t newmode = 0755;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([&](auto in) {
 			uint32_t valid = FATTR_ATIME;
 			return (in.header.opcode == FUSE_SETATTR &&
 				in.header.nodeid == ino &&
 				in.body.setattr.valid == valid &&
 				(time_t)in.body.setattr.atime ==
 					sb.st_atim.tv_sec &&
-				in.body.setattr.atimensec ==
+				(long)in.body.setattr.atimensec ==
 					sb.st_atim.tv_nsec);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
 		SET_OUT_HEADER_LEN(out, attr);
 		out.body.attr.attr.ino = ino;
 		out.body.attr.attr.mode = S_IFREG | newmode;
 	})));
 	expect_flush(ino, 1, ReturnErrno(0));
 	expect_release(ino, FuseTest::FH);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	/* Ensure atime will be different than during lookup */
 	nap();
 
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb));
 
 	close(fd);
 }
 
 /* A cached atime should be flushed during FUSE_SETATTR */
 TEST_F(Read, atime_during_setattr)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	struct stat sb;
 	uint64_t ino = 42;
 	const mode_t newmode = 0755;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([&](auto in) {
 			uint32_t valid = FATTR_MODE | FATTR_ATIME;
 			return (in.header.opcode == FUSE_SETATTR &&
 				in.header.nodeid == ino &&
 				in.body.setattr.valid == valid &&
 				(time_t)in.body.setattr.atime ==
 					sb.st_atim.tv_sec &&
-				in.body.setattr.atimensec ==
+				(long)in.body.setattr.atimensec ==
 					sb.st_atim.tv_nsec);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
 		SET_OUT_HEADER_LEN(out, attr);
 		out.body.attr.attr.ino = ino;
 		out.body.attr.attr.mode = S_IFREG | newmode;
 	})));
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	/* Ensure atime will be different than during lookup */
 	nap();
 
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb));
 	ASSERT_EQ(0, fchmod(fd, newmode)) << strerror(errno);
 
 	leak(fd);
 }
 
 /* The kernel should flush dirty atime values during close */
 /* 0-length reads shouldn't cause any confusion */
 TEST_F(Read, direct_io_read_nothing)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	uint64_t ino = 42;
 	int fd;
 	uint64_t offset = 100;
 	char buf[80];
 
 	expect_lookup(RELPATH, ino, offset + 1000);
 	expect_open(ino, FOPEN_DIRECT_IO, 1);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(0, pread(fd, buf, 0, offset)) << strerror(errno);
 	leak(fd);
 }
 
 /* 
  * With direct_io, reads should not fill the cache.  They should go straight to
  * the daemon
  */
 TEST_F(Read, direct_io_pread)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	uint64_t offset = 100;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, offset + bufsize);
 	expect_open(ino, FOPEN_DIRECT_IO, 1);
 	expect_read(ino, offset, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(bufsize, pread(fd, buf, bufsize, offset)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 
 	// With FOPEN_DIRECT_IO, the cache should be bypassed.  The server will
 	// get a 2nd read request.
 	expect_read(ino, offset, bufsize, bufsize, CONTENTS);
 	ASSERT_EQ(bufsize, pread(fd, buf, bufsize, offset)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 	leak(fd);
 }
 
 /* 
  * With direct_io, filesystems are allowed to return less data than is
  * requested.  fuse(4) should return a short read to userland.
  */
 TEST_F(Read, direct_io_short_read)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefghijklmnop";
 	uint64_t ino = 42;
 	int fd;
 	uint64_t offset = 100;
 	ssize_t bufsize = strlen(CONTENTS);
 	ssize_t halfbufsize = bufsize / 2;
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, offset + bufsize);
 	expect_open(ino, FOPEN_DIRECT_IO, 1);
 	expect_read(ino, offset, bufsize, halfbufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(halfbufsize, pread(fd, buf, bufsize, offset))
 		<< strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, halfbufsize));
 	leak(fd);
 }
 
 TEST_F(Read, eio)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke(ReturnErrno(EIO)));
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(-1, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(EIO, errno);
 	leak(fd);
 }
 
 /* 
  * If the server returns a short read when direct io is not in use, that
  * indicates EOF, because of a server-side truncation.  We should invalidate
  * all cached attributes.  We may update the file size, 
  */
 TEST_F(Read, eof)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefghijklmnop";
 	uint64_t ino = 42;
 	int fd;
 	uint64_t offset = 100;
 	ssize_t bufsize = strlen(CONTENTS);
 	ssize_t partbufsize = 3 * bufsize / 4;
 	ssize_t r;
 	uint8_t buf[bufsize];
 	struct stat sb;
 
 	expect_lookup(RELPATH, ino, offset + bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, offset + bufsize, offset + partbufsize, CONTENTS);
 	expect_getattr(ino, offset + partbufsize);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	r = pread(fd, buf, bufsize, offset);
 	ASSERT_LE(0, r) << strerror(errno);
 	EXPECT_EQ(partbufsize, r) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb));
 	EXPECT_EQ((off_t)(offset + partbufsize), sb.st_size);
 	leak(fd);
 }
 
 /* Like Read.eof, but causes an entire buffer to be invalidated */
 TEST_F(Read, eof_of_whole_buffer)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefghijklmnop";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	off_t old_filesize = m_maxbcachebuf * 2 + bufsize;
 	uint8_t buf[bufsize];
 	struct stat sb;
 
 	expect_lookup(RELPATH, ino, old_filesize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 2 * m_maxbcachebuf, bufsize, bufsize, CONTENTS);
 	expect_read(ino, m_maxbcachebuf, m_maxbcachebuf, 0, CONTENTS);
 	expect_getattr(ino, m_maxbcachebuf);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	/* Cache the third block */
 	ASSERT_EQ(bufsize, pread(fd, buf, bufsize, m_maxbcachebuf * 2))
 		<< strerror(errno);
 	/* Try to read the 2nd block, but it's past EOF */
 	ASSERT_EQ(0, pread(fd, buf, bufsize, m_maxbcachebuf))
 		<< strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb));
 	EXPECT_EQ((off_t)(m_maxbcachebuf), sb.st_size);
 	leak(fd);
 }
 
 /* 
  * With the keep_cache option, the kernel may keep its read cache across
  * multiple open(2)s.
  */
 TEST_F(Read, keep_cache)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd0, fd1;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	FuseTest::expect_lookup(RELPATH, ino, S_IFREG | 0644, bufsize, 2);
 	expect_open(ino, FOPEN_KEEP_CACHE, 2);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd0 = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd0) << strerror(errno);
 	ASSERT_EQ(bufsize, read(fd0, buf, bufsize)) << strerror(errno);
 
 	fd1 = open(FULLPATH, O_RDWR);
 	ASSERT_LE(0, fd1) << strerror(errno);
 
 	/*
 	 * This read should be serviced by cache, even though it's on the other
 	 * file descriptor
 	 */
 	ASSERT_EQ(bufsize, read(fd1, buf, bufsize)) << strerror(errno);
 
 	leak(fd0);
 	leak(fd1);
 }
 
 /* 
  * Without the keep_cache option, the kernel should drop its read caches on
  * every open
  */
 TEST_F(Read, keep_cache_disabled)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd0, fd1;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	FuseTest::expect_lookup(RELPATH, ino, S_IFREG | 0644, bufsize, 2);
 	expect_open(ino, 0, 2);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd0 = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd0) << strerror(errno);
 	ASSERT_EQ(bufsize, read(fd0, buf, bufsize)) << strerror(errno);
 
 	fd1 = open(FULLPATH, O_RDWR);
 	ASSERT_LE(0, fd1) << strerror(errno);
 
 	/*
 	 * This read should not be serviced by cache, even though it's on the
 	 * original file descriptor
 	 */
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 	ASSERT_EQ(0, lseek(fd0, 0, SEEK_SET)) << strerror(errno);
 	ASSERT_EQ(bufsize, read(fd0, buf, bufsize)) << strerror(errno);
 
 	leak(fd0);
 	leak(fd1);
 }
 
 TEST_F(Read, mmap)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t len;
 	size_t bufsize = strlen(CONTENTS);
 	void *p;
 
 	len = getpagesize();
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ &&
 				in.header.nodeid == ino &&
 				in.body.read.fh == Read::FH &&
 				in.body.read.offset == 0 &&
 				in.body.read.size == bufsize);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
 		out.header.len = sizeof(struct fuse_out_header) + bufsize;
 		memmove(out.body.bytes, CONTENTS, bufsize);
 	})));
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	p = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
 	ASSERT_NE(MAP_FAILED, p) << strerror(errno);
 
 	ASSERT_EQ(0, memcmp(p, CONTENTS, bufsize));
 
 	ASSERT_EQ(0, munmap(p, len)) << strerror(errno);
 	leak(fd);
 }
 
 /*
  * The kernel should not update the cached atime attribute during a read, if
  * MNT_NOATIME is used.
  */
 TEST_F(ReadNoatime, atime)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	struct stat sb1, sb2;
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb1));
 
 	nap();
 
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb2));
 
 	/* The kernel should not update atime during read */
 	EXPECT_TRUE(timespeccmp(&sb1.st_atim, &sb2.st_atim, ==));
 	EXPECT_TRUE(timespeccmp(&sb1.st_ctim, &sb2.st_ctim, ==));
 	EXPECT_TRUE(timespeccmp(&sb1.st_mtim, &sb2.st_mtim, ==));
 
 	leak(fd);
 }
 
 /*
  * The kernel should not update the cached atime attribute during a cached
  * read, if MNT_NOATIME is used.
  */
 TEST_F(ReadNoatime, atime_cached)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	struct stat sb1, sb2;
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(bufsize, pread(fd, buf, bufsize, 0)) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb1));
 
 	nap();
 
 	ASSERT_EQ(bufsize, pread(fd, buf, bufsize, 0)) << strerror(errno);
 	ASSERT_EQ(0, fstat(fd, &sb2));
 
 	/* The kernel should automatically update atime during read */
 	EXPECT_TRUE(timespeccmp(&sb1.st_atim, &sb2.st_atim, ==));
 	EXPECT_TRUE(timespeccmp(&sb1.st_ctim, &sb2.st_ctim, ==));
 	EXPECT_TRUE(timespeccmp(&sb1.st_mtim, &sb2.st_mtim, ==));
 
 	leak(fd);
 }
 
 /* Read of an mmap()ed file fails */
 TEST_F(ReadSigbus, mmap_eio)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	struct sigaction sa;
 	uint64_t ino = 42;
 	int fd;
 	ssize_t len;
 	size_t bufsize = strlen(CONTENTS);
 	void *p;
 
 	len = getpagesize();
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ &&
 				in.header.nodeid == ino &&
 				in.body.read.fh == Read::FH);
 		}, Eq(true)),
 		_)
 	).WillRepeatedly(Invoke(ReturnErrno(EIO)));
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	p = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
 	ASSERT_NE(MAP_FAILED, p) << strerror(errno);
 
 	/* Accessing the mapped page should return SIGBUS.  */
 
 	bzero(&sa, sizeof(sa));
 	sa.sa_handler = SIG_DFL;
 	sa.sa_sigaction = handle_sigbus;
 	sa.sa_flags = SA_RESETHAND | SA_SIGINFO;
 	ASSERT_EQ(0, sigaction(SIGBUS, &sa, NULL)) << strerror(errno);
 	if (setjmp(ReadSigbus::s_jmpbuf) == 0) {
 		atomic_signal_fence(std::memory_order::memory_order_seq_cst);
 		volatile char x __unused = *(volatile char*)p;
 		FAIL() << "shouldn't get here";
 	}
 
 	ASSERT_EQ(p, ReadSigbus::s_si_addr);
 	ASSERT_EQ(0, munmap(p, len)) << strerror(errno);
 	leak(fd);
 }
 
 /* 
  * A read via mmap comes up short, indicating that the file was truncated
  * server-side.
  */
 TEST_F(Read, mmap_eof)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t len;
 	size_t bufsize = strlen(CONTENTS);
 	struct stat sb;
 	void *p;
 
 	len = getpagesize();
 
 	expect_lookup(RELPATH, ino, m_maxbcachebuf);
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ &&
 				in.header.nodeid == ino &&
 				in.body.read.fh == Read::FH &&
 				in.body.read.offset == 0 &&
 				in.body.read.size == (uint32_t)m_maxbcachebuf);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
 		out.header.len = sizeof(struct fuse_out_header) + bufsize;
 		memmove(out.body.bytes, CONTENTS, bufsize);
 	})));
 	expect_getattr(ino, bufsize);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	p = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
 	ASSERT_NE(MAP_FAILED, p) << strerror(errno);
 
 	/* The file size should be automatically truncated */
 	ASSERT_EQ(0, memcmp(p, CONTENTS, bufsize));
 	ASSERT_EQ(0, fstat(fd, &sb)) << strerror(errno);
 	EXPECT_EQ((off_t)bufsize, sb.st_size);
 
 	ASSERT_EQ(0, munmap(p, len)) << strerror(errno);
 	leak(fd);
 }
 
 /*
  * During VOP_GETPAGES, the FUSE server fails a FUSE_GETATTR operation.  This
  * almost certainly indicates a buggy FUSE server, and our goal should be not
  * to panic.  Instead, generate SIGBUS.
  */
 TEST_F(ReadSigbus, mmap_getblksz_fail)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	struct sigaction sa;
 	Sequence seq;
 	uint64_t ino = 42;
 	int fd;
 	ssize_t len;
 	size_t bufsize = strlen(CONTENTS);
 	mode_t mode = S_IFREG | 0644;
 	void *p;
 
 	len = getpagesize();
 
 	FuseTest::expect_lookup(RELPATH, ino, mode, bufsize, 1, 0);
 	/* Expect two GETATTR calls that succeed, followed by one that fail. */
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_GETATTR &&
 				in.header.nodeid == ino);
 		}, Eq(true)),
 		_)
 	).Times(2)
 	.InSequence(seq)
 	.WillRepeatedly(Invoke(ReturnImmediate([=](auto i __unused, auto& out) {
 		SET_OUT_HEADER_LEN(out, attr);
 		out.body.attr.attr.ino = ino;
 		out.body.attr.attr.mode = mode;
 		out.body.attr.attr.size = bufsize;
 		out.body.attr.attr_valid = 0;
 	})));
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_GETATTR &&
 				in.header.nodeid == ino);
 		}, Eq(true)),
 		_)
 	).InSequence(seq)
 	.WillRepeatedly(Invoke(ReturnErrno(EIO)));
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ);
 		}, Eq(true)),
 		_)
 	).Times(0);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	p = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
 	ASSERT_NE(MAP_FAILED, p) << strerror(errno);
 
 	/* Accessing the mapped page should return SIGBUS.  */
 	bzero(&sa, sizeof(sa));
 	sa.sa_handler = SIG_DFL;
 	sa.sa_sigaction = handle_sigbus;
 	sa.sa_flags = SA_RESETHAND | SA_SIGINFO;
 	ASSERT_EQ(0, sigaction(SIGBUS, &sa, NULL)) << strerror(errno);
 	if (setjmp(ReadSigbus::s_jmpbuf) == 0) {
 		atomic_signal_fence(std::memory_order::memory_order_seq_cst);
 		volatile char x __unused = *(volatile char*)p;
 		FAIL() << "shouldn't get here";
 	}
 
 	ASSERT_EQ(p, ReadSigbus::s_si_addr);
 	ASSERT_EQ(0, munmap(p, len)) << strerror(errno);
 	leak(fd);
 }
 
 /*
  * Just as when FOPEN_DIRECT_IO is used, reads with O_DIRECT should bypass
  * cache and to straight to the daemon
  */
 TEST_F(Read, o_direct)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	// Fill the cache
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 
 	// Reads with o_direct should bypass the cache
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 	ASSERT_EQ(0, fcntl(fd, F_SETFL, O_DIRECT)) << strerror(errno);
 	ASSERT_EQ(0, lseek(fd, 0, SEEK_SET)) << strerror(errno);
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 
 	leak(fd);
 }
 
 TEST_F(Read, pread)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	/* 
 	 * Set offset to a maxbcachebuf boundary so we'll be sure what offset
 	 * to read from.  Without this, the read might start at a lower offset.
 	 */
 	uint64_t offset = m_maxbcachebuf;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, offset + bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, offset, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(bufsize, pread(fd, buf, bufsize, offset)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 	leak(fd);
 }
 
 TEST_F(Read, read)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 
 	leak(fd);
 }
 
 TEST_F(Read_7_8, read)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 
 	leak(fd);
 }
 
 /* 
  * If cacheing is enabled, the kernel should try to read an entire cache block
  * at a time.
  */
 TEST_F(Read, cache_block)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS0 = "abcdefghijklmnop";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = 8;
 	ssize_t filesize = m_maxbcachebuf * 2;
 	char *contents;
 	char buf[bufsize];
 	const char *contents1 = CONTENTS0 + bufsize;
 
 	contents = (char*)calloc(1, filesize);
 	ASSERT_NE(nullptr, contents);
 	memmove(contents, CONTENTS0, strlen(CONTENTS0));
 
 	expect_lookup(RELPATH, ino, filesize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, m_maxbcachebuf, m_maxbcachebuf,
 		contents);
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS0, bufsize));
 
 	/* A subsequent read should be serviced by cache */
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, contents1, bufsize));
 	leak(fd);
 	free(contents);
 }
 
 /* Reading with sendfile should work (though it obviously won't be 0-copy) */
 TEST_F(Read, sendfile)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	size_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 	int sp[2];
 	off_t sbytes;
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ &&
 				in.header.nodeid == ino &&
 				in.body.read.fh == Read::FH &&
 				in.body.read.offset == 0 &&
 				in.body.read.size == bufsize);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
 		out.header.len = sizeof(struct fuse_out_header) + bufsize;
 		memmove(out.body.bytes, CONTENTS, bufsize);
 	})));
 
 	ASSERT_EQ(0, socketpair(PF_LOCAL, SOCK_STREAM, 0, sp))
 		<< strerror(errno);
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(0, sendfile(fd, sp[1], 0, bufsize, NULL, &sbytes, 0))
 		<< strerror(errno);
 	ASSERT_EQ(static_cast<ssize_t>(bufsize), read(sp[0], buf, bufsize))
 		<< strerror(errno);
 	ASSERT_EQ(0, memcmp(buf, CONTENTS, bufsize));
 
 	close(sp[1]);
 	close(sp[0]);
 	leak(fd);
 }
 
 /* sendfile should fail gracefully if fuse declines the read */
 /* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236466 */
 TEST_F(Read, sendfile_eio)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	uint64_t ino = 42;
 	int fd;
 	ssize_t bufsize = strlen(CONTENTS);
 	int sp[2];
 	off_t sbytes;
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			return (in.header.opcode == FUSE_READ);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke(ReturnErrno(EIO)));
 
 	ASSERT_EQ(0, socketpair(PF_LOCAL, SOCK_STREAM, 0, sp))
 		<< strerror(errno);
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_NE(0, sendfile(fd, sp[1], 0, bufsize, NULL, &sbytes, 0));
 
 	close(sp[1]);
 	close(sp[0]);
 	leak(fd);
 }
 
 /*
  * Sequential reads should use readahead.  And if allowed, large reads should
  * be clustered.
  */
 TEST_P(ReadAhead, readahead) {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	uint64_t ino = 42;
 	int fd, maxcontig, clustersize;
 	ssize_t bufsize = 4 * m_maxbcachebuf;
 	ssize_t filesize = bufsize;
 	uint64_t len;
 	char *rbuf, *contents;
 	off_t offs;
 
 	contents = (char*)malloc(filesize);
 	ASSERT_NE(nullptr, contents);
 	memset(contents, 'X', filesize);
 	rbuf = (char*)calloc(1, bufsize);
 
 	expect_lookup(RELPATH, ino, filesize);
 	expect_open(ino, 0, 1);
 	maxcontig = m_noclusterr ? m_maxbcachebuf :
 		m_maxbcachebuf + m_maxreadahead;
 	clustersize = MIN(maxcontig, m_maxphys);
 	for (offs = 0; offs < bufsize; offs += clustersize) {
 		len = std::min((size_t)clustersize, (size_t)(filesize - offs));
 		expect_read(ino, offs, len, len, contents + offs);
 	}
 
 	fd = open(FULLPATH, O_RDONLY);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	/* Set the internal readahead counter to a "large" value */
 	ASSERT_EQ(0, fcntl(fd, F_READAHEAD, 1'000'000'000)) << strerror(errno);
 
 	ASSERT_EQ(bufsize, read(fd, rbuf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, memcmp(rbuf, contents, bufsize));
 
 	leak(fd);
 	free(rbuf);
 	free(contents);
 }
 
 INSTANTIATE_TEST_CASE_P(RA, ReadAhead,
 	Values(tuple<bool, int>(false, 0),
 	       tuple<bool, int>(false, 1),
 	       tuple<bool, int>(false, 2),
 	       tuple<bool, int>(false, 3),
 	       tuple<bool, int>(true, 0),
 	       tuple<bool, int>(true, 1),
 	       tuple<bool, int>(true, 2)));
 
 /* fuse_init_out.time_gran controls the granularity of timestamps */
 TEST_P(TimeGran, atime_during_setattr)
 {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const char *CONTENTS = "abcdefgh";
 	ssize_t bufsize = strlen(CONTENTS);
 	uint8_t buf[bufsize];
 	uint64_t ino = 42;
 	const mode_t newmode = 0755;
 	int fd;
 
 	expect_lookup(RELPATH, ino, bufsize);
 	expect_open(ino, 0, 1);
 	expect_read(ino, 0, bufsize, bufsize, CONTENTS);
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			uint32_t valid = FATTR_MODE | FATTR_ATIME;
 			return (in.header.opcode == FUSE_SETATTR &&
 				in.header.nodeid == ino &&
 				in.body.setattr.valid == valid &&
 				in.body.setattr.atimensec % m_time_gran == 0);
 		}, Eq(true)),
 		_)
 	).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
 		SET_OUT_HEADER_LEN(out, attr);
 		out.body.attr.attr.ino = ino;
 		out.body.attr.attr.mode = S_IFREG | newmode;
 	})));
 
 	fd = open(FULLPATH, O_RDWR);
 	ASSERT_LE(0, fd) << strerror(errno);
 
 	ASSERT_EQ(bufsize, read(fd, buf, bufsize)) << strerror(errno);
 	ASSERT_EQ(0, fchmod(fd, newmode)) << strerror(errno);
 
 	leak(fd);
 }
 
 INSTANTIATE_TEST_CASE_P(TG, TimeGran, Range(0u, 10u));