#! /bin/bash
# FSQA Test No. 104
#
# Test that if we add hard links (in the same directory) to two files and then
# fsync only one of the files, after the fsync log/journal is replayed all the
# links exist and the filesystem metadata (directory and file inodes) 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 files.
mkdir $SCRATCH_MNT/testdir
touch $SCRATCH_MNT/testdir/foo
touch $SCRATCH_MNT/testdir/bar

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

# Create one hard link for file foo and another one for file bar. After that
# fsync only the file bar.
ln $SCRATCH_MNT/testdir/bar $SCRATCH_MNT/testdir/bar_link
ln $SCRATCH_MNT/testdir/foo $SCRATCH_MNT/testdir/foo_link
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/testdir/bar

_flakey_drop_and_remount

# Now verify both our files have a link count of 2.
echo "Link count for file foo: $(stat -c %h $SCRATCH_MNT/testdir/foo)"
echo "Link count for file bar: $(stat -c %h $SCRATCH_MNT/testdir/bar)"

# We should be able to remove all the links of our files in testdir, and after
# that the parent directory should become empty and therefore possible to
# remove it.
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