#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2018 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 527
#
# Test that after a combination of file renames, deletions, linking and creating
# new files with names that were previously deleted, if we fsync the new file,
# after a power failure we are able to mount the filesystem and all file names
# correspond to the correct inodes.
#
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

mkdir $SCRATCH_MNT/testdir
echo -n "foo" > $SCRATCH_MNT/testdir/fname1
echo -n "hello" > $SCRATCH_MNT/testdir/fname2

# For a different variant of the same test but when files have hardlinks too.
mkdir $SCRATCH_MNT/testdir2
echo -n "foo" > $SCRATCH_MNT/testdir2/zz
ln $SCRATCH_MNT/testdir2/zz $SCRATCH_MNT/testdir2/zz_link
echo -n "hello" > $SCRATCH_MNT/testdir2/a

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

# Rename, remove and link files such that one new name corresponds to the name
# of a deleted file and one new file has the old name of the renamed file. Then
# fsync only the new file.
mv $SCRATCH_MNT/testdir/fname1 $SCRATCH_MNT/testdir/fname3
rm -f $SCRATCH_MNT/testdir/fname2
ln $SCRATCH_MNT/testdir/fname3 $SCRATCH_MNT/testdir/fname2
echo -n "bar" > $SCRATCH_MNT/testdir/fname1
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/testdir/fname1

# A second variant, more complex, that involves files with hardlinks too.

# The following 3 renames are equivalent to a rename exchange (zz_link to a), but
# without the atomicity which isn't required here.
mv $SCRATCH_MNT/testdir2/a $SCRATCH_MNT/testdir2/tmp
mv $SCRATCH_MNT/testdir2/zz_link $SCRATCH_MNT/testdir2/a
mv $SCRATCH_MNT/testdir2/tmp $SCRATCH_MNT/testdir2/zz_link

# The following rename and file creation are equivalent to a rename whiteout.
mv $SCRATCH_MNT/testdir2/zz $SCRATCH_MNT/testdir2/a2
echo -n "bar" > $SCRATCH_MNT/testdir2/zz

# Fsync of zz should work and produce correct results after a power failure.
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/testdir2/zz

# Simulate a power failure and mount the filesystem to check that all file names
# exist and correspond to the correct inodes.
_flakey_drop_and_remount

echo "File fname1 data after power failure: $(cat $SCRATCH_MNT/testdir/fname1)"
echo "File fname2 data after power failure: $(cat $SCRATCH_MNT/testdir/fname2)"
echo "File fname3 data after power failure: $(cat $SCRATCH_MNT/testdir/fname3)"

echo "File a data after power failure: $(cat $SCRATCH_MNT/testdir2/a)"
echo "File a2 data after power failure: $(cat $SCRATCH_MNT/testdir2/a2)"
echo "File zz data after power failure: $(cat $SCRATCH_MNT/testdir2/zz)"
echo "File zz_link data after power failure: $(cat $SCRATCH_MNT/testdir2/zz_link)"

_unmount_flakey

status=0
exit