tests/generic/588

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 588
#
# Test that if we clone part of an extent from a file to itself at different
# offset, fsync it, rewrite (COW) part of the extent from the former offset,
# fsync it again, power fail and then mount the filesystem, we are able to
# read the whole file and it has the correct data.
#
. ./common/preamble
_begin_fstest auto quick log clone

# Override the default cleanup function.
_cleanup()
{
	_cleanup_flakey
	cd /
	rm -f $tmp.*
}

# Import common functions.
. ./common/filter
. ./common/reflink
. ./common/dmflakey

_require_scratch_reflink
_require_dm_target flakey

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

_require_congruent_file_oplen $SCRATCH_MNT 65536

# Create our test file with two 256Kb extents, one at file offset 0 and the
# other at file offset 256Kb.
$XFS_IO_PROG -f -c "pwrite -S 0xa3 0 256K" \
	     -c "fsync" \
	     -c "pwrite -S 0xc7 256K 256K" \
	     $SCRATCH_MNT/foobar | _filter_xfs_io

# Now clone the second 64Kb of data from the second extent into file offset 0.
# After this we get that extent partially shared. Also fsync the file.
$XFS_IO_PROG -c "reflink $SCRATCH_MNT/foobar 320K 0K 64K" \
	     -c "fsync" \
	     $SCRATCH_MNT/foobar | _filter_xfs_io

# Now COW the first 64Kb of data for that second extent. After this we no longer
# have the extent fully referenced - its second 64Kb of data are referenced at
# file offset 0 and its last 192Kb of data are referenced at file offset 320Kb.
# Fsync the file to make sure everything is durably persisted.
$XFS_IO_PROG -c "pwrite -S 0xe5 256K 64K" \
	     -c "fsync" \
	     $SCRATCH_MNT/foobar | _filter_xfs_io

echo "File digest before power failure:"
_md5_checksum $SCRATCH_MNT/foobar

# Simulate a power failure and then check no data loss or corruption happened.
_flakey_drop_and_remount

echo "File digest after mount:"
_md5_checksum $SCRATCH_MNT/foobar

_unmount_flakey
status=0
exit