#! /bin/bash
# FSQA Test No. 479
#
# Test that when a fsync journal/log exists, if we rename a special file (fifo,
# symbolic link or device), create a hard link for it with its old name and then
# commit the journal/log, if a power loss happens the filesystem will not fail
# to replay the journal/log when it is mounted the next time.
#
#-----------------------------------------------------------------------
#
# Copyright (C) 2018 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
	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_dm_target flakey

rm -f $seqres.full

run_test()
{
	local file_type=$1

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

	mkdir $SCRATCH_MNT/testdir
	case $file_type in
	symlink)
		ln -s xxx $SCRATCH_MNT/testdir/foo
		;;
	fifo)
		mkfifo $SCRATCH_MNT/testdir/foo
		;;
	dev)
		mknod $SCRATCH_MNT/testdir/foo c 0 0
		;;
	*)
		_fail "Invalid file type argument: $file_type"
	esac
	# Make sure everything done so far is durably persisted.
	sync

	# Create a file and fsync it just to create a journal/log. This file
	# must be in the same directory as our special file "foo".
	touch $SCRATCH_MNT/testdir/f1
	$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/testdir/f1

	# Rename our special file and then create link that has its old name.
	mv $SCRATCH_MNT/testdir/foo $SCRATCH_MNT/testdir/bar
	ln $SCRATCH_MNT/testdir/bar $SCRATCH_MNT/testdir/foo

	# Create a second file and fsync it. This is just to durably persist the
	# fsync journal/log which is typically modified by the previous rename
	# and link operations. This file does not need to be placed in the same
	# directory as our special file.
	touch $SCRATCH_MNT/f2
	$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/f2

	# Simulate a power failure and mount the filesystem to check that
	# replaying the fsync log/journal succeeds, that is the mount operation
	# does not fail.
	_flakey_drop_and_remount
	_unmount_flakey
	_cleanup_flakey
}

run_test symlink
run_test fifo
run_test dev

echo "Silence is golden"
status=0
exit