tests/generic/557

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 557
#
# Test that if we fsync a file, evict its inode, unlink it and then fsync its
# parent directory, after a power failure the file does not exists.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

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

# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/dmflakey

# real QA test starts here
_supported_fs generic
_require_scratch
_require_dm_target flakey

rm -f $seqres.full

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

# Create our test directory with one file in it and fsync the file.
mkdir $SCRATCH_MNT/dir
touch $SCRATCH_MNT/dir/foo
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/dir/foo

# Keep an open file descriptor on our directory while we evict inodes. We just
# want to evict the file's inode, the directory's inode must not be evicted.
(
	cd $SCRATCH_MNT/dir
	while true; do
		:
	done
) &
pid=$!
# Wait a bit to give time to background process to chdir to our test directory.
sleep 0.1

# Trigger eviction of the file's inode.
echo 2 > /proc/sys/vm/drop_caches

# Unlink our file and fsync the parent directory. After a power failure we don't
# expect to see the file anymore, since we fsync'ed the parent directory.
unlink $SCRATCH_MNT/dir/foo
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/dir

# Kill the background process using our test directory.
kill $pid
wait $pid

# Simulate a power failure and then check file foo does not exists anymore.
_flakey_drop_and_remount

[ -f $SCRATCH_MNT/dir/foo ] && echo "File foo still exists"

_unmount_flakey
echo "Silence is golden"
status=0
exit