#! /bin/bash
# FSQA Test No. 107
#
# Test that when we have a file with multiple hard links belonging to different
# parent directories, if we remove one of those links, fsync the file using one
# of its other links (that has a parent directory different from the one we
# removed a link from), power fail and then replay the fsync log/journal, the
# hard link we removed is not available anymore and all the filesystem metadata
# is in a consistent state.
#
#-----------------------------------------------------------------------
#
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
# Author: Filipe Manana <fdmanana@suse.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#

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
_supported_os Linux
_require_scratch
_require_dm_target flakey
_require_metadata_journaling $SCRATCH_DEV

rm -f $seqres.full

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

# Create our test directory and file.
mkdir $SCRATCH_MNT/testdir
touch $SCRATCH_MNT/foo
ln $SCRATCH_MNT/foo $SCRATCH_MNT/testdir/foo2
ln $SCRATCH_MNT/foo $SCRATCH_MNT/testdir/foo3

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

# Now we remove one of our file's hardlinks in the directory testdir.
unlink $SCRATCH_MNT/testdir/foo3

# We now fsync our file using the "foo" link, which has a parent that
# is not the directory "testdir".
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo

_flakey_drop_and_remount

# After the journal/log is replayed we expect to not see the "foo3" link anymore
# and we should be able to remove all names in the directory "testdir" and then
# remove it (no stale directory entries left after the journal/log replay).
echo "Entries in testdir:"
ls -1 $SCRATCH_MNT/testdir

rm -f $SCRATCH_MNT/testdir/*
rmdir $SCRATCH_MNT/testdir

_unmount_flakey

status=0
exit