tests/generic/703

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2022 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 703
#
# Test that direct IO writes with io_uring and O_DSYNC are durable if a power
# failure happens after they complete.
#
. ./common/preamble
_begin_fstest auto quick log prealloc io_uring

_cleanup()
{
	_cleanup_flakey
	cd /
	rm -r -f $tmp.*
}

. ./common/dmflakey

fio_config=$tmp.fio
fio_out=$tmp.fio.out
test_file="${SCRATCH_MNT}/foo"

[ $FSTYP == "btrfs" ] &&
	_fixed_by_kernel_commit 8184620ae212 \
	"btrfs: fix lost file sync on direct IO write with nowait and dsync iocb"

# We allocate 256M of data for the test file, so require a higher size of 512M
# which gives a margin of safety for a COW filesystem like btrfs (where metadata
# is always COWed).
_require_scratch_size $((512 * 1024))
_require_odirect
_require_io_uring
_require_dm_target flakey
_require_xfs_io_command "falloc"

cat >$fio_config <<EOF
[test_io_uring_dio_dsync]
ioengine=io_uring
direct=1
bs=64K
sync=1
filename=$test_file
rw=randwrite
time_based
runtime=10
EOF

_require_fio $fio_config

_scratch_mkfs >>$seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey

# We do 64K writes in the fio job.
_require_congruent_file_oplen $SCRATCH_MNT $((64 * 1024))

touch $test_file

# On btrfs IOCB_NOWAIT writes can only be done on NOCOW files, so enable
# nodatacow on the file if we are running on btrfs.
if [ $FSTYP == "btrfs" ]; then
	_require_chattr C
	$CHATTR_PROG +C $test_file
fi

$XFS_IO_PROG -c "falloc 0 256M" $test_file

# Persist everything, make sure the file exists after power failure.
_scratch_sync

echo -e "Running fio with config:\n" >> $seqres.full
cat $fio_config >> $seqres.full

$FIO_PROG $fio_config --output=$fio_out

echo -e "\nOutput from fio:\n" >> $seqres.full
cat $fio_out >> $seqres.full

digest_before=$(_md5_checksum $test_file)

# Simulate a power failure and mount the filesystem to check that all the data
# previously written are available.
_flakey_drop_and_remount

digest_after=$(_md5_checksum $test_file)

if [ "$digest_after" != "$digest_before" ]; then
	echo "Error: not all file data got persisted."
	echo "Digest before power failure: $digest_before"
	echo "Digest after power failure:  $digest_after"
fi

_unmount_flakey

# success, all done
echo "Silence is golden"
status=0
exit