apfstests/tests/generic/502

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2018 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 502
#
# Test that if we have a file with 2 (or more) hard links in the same parent
# directory, rename of the hard links, rename one of the other hard links to
# the old name of the hard link we renamed before, create a new file in the
# same parent directory with the old name of second hard link we renamed, fsync
# fsync this new file and power fail, we will be able to mount again the
# filesystem and the new file and all hard links exist.
#
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
_supported_os Linux
_require_scratch
_require_hardlinks
_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 file with 2 hard links in the same parent directory.
mkdir $SCRATCH_MNT/testdir
touch $SCRATCH_MNT/testdir/foo
ln $SCRATCH_MNT/testdir/foo $SCRATCH_MNT/testdir/bar

# Make sure everything done so far is durably persisted.
sync

# Now rename the first hard link (foo) to a new name and rename the second hard
# link (bar) to the old name of the first hard link (foo).
mv $SCRATCH_MNT/testdir/foo $SCRATCH_MNT/testdir/qwerty
mv $SCRATCH_MNT/testdir/bar $SCRATCH_MNT/testdir/foo

# Create a new file, in the same parent directory, with the old name of the
# second hard link (bar) and fsync this new file.
touch $SCRATCH_MNT/testdir/bar
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/testdir/bar

echo "Contents of test directory before the power failure:"
ls -R $SCRATCH_MNT/testdir | _filter_scratch

# Simulate a power failure and mount the filesystem to check that we are able to
# mount it and we have the same files, with the same hard links, that we had
# before the power failure and in the same order.
_flakey_drop_and_remount

echo "Contents of test directory after the power failure:"
ls -R $SCRATCH_MNT/testdir | _filter_scratch

_unmount_flakey
_cleanup_flakey

status=0
exit