#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 106
#
# Test that if we remove one hard link from an inode, evict the inode, fsync the
# inode, power fail and then mount the filesystem, the hard link we removed does
# not exists anymore and the filesystem metadata is in a consistent state.
#
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
	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_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.
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 remove one of the links, trigger inode eviction and then fsync our
# inode.
unlink $SCRATCH_MNT/testdir/bar
echo 2 > /proc/sys/vm/drop_caches
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/testdir/foo

_flakey_drop_and_remount

# Now verify our directory entries.
echo "Entries in testdir:"
ls -1 $SCRATCH_MNT/testdir

# If we remove our inode, its parent should become empty and therefore we should
# be able to remove the parent.
rm -f $SCRATCH_MNT/testdir/*
rmdir $SCRATCH_MNT/testdir

_unmount_flakey

# The fstests framework will call fsck against our filesystem which will verify
# that all metadata is in a consistent state.

status=0
exit