#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2018 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 501
#
# Test that if we do a buffered write to a file, fsync it, clone a range from
# another file into our file that overlaps the previously written range, fsync
# the file again and then power fail, after we mount again the filesystem, no
# file data was lost or corrupted.
#
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/reflink
. ./common/dmflakey

# real QA test starts here
_supported_fs generic
_supported_os Linux
_require_scratch_reflink
_require_dm_target flakey

rm -f $seqres.full

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

$XFS_IO_PROG -f -c "pwrite -S 0x18 9000K 6908K" $SCRATCH_MNT/foo >>$seqres.full
$XFS_IO_PROG -f -c "pwrite -S 0x20 2572K 156K" $SCRATCH_MNT/bar >>$seqres.full

# We clone from file foo into a range of file bar that overlaps the existing
# extent at file bar. The destination offset of the reflink operation matches
# the eof position of file bar minus 4Kb.
$XFS_IO_PROG -c "fsync" \
	     -c "reflink ${SCRATCH_MNT}/foo 0 2724K 15908K" \
	     -c "fsync" \
	     $SCRATCH_MNT/bar >>$seqres.full

echo "File bar digest before power failure:"
md5sum $SCRATCH_MNT/bar | _filter_scratch

# Simulate a power failure and mount the filesystem to check that no file data
# was lost or corrupted.
_flakey_drop_and_remount

echo "File bar digest after power failure:"
md5sum $SCRATCH_MNT/bar | _filter_scratch

_unmount_flakey
_cleanup_flakey

status=0
exit