tests/generic/501

#! /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.
#
. ./common/preamble
_begin_fstest auto quick clone log

# 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 2097152

# Use file sizes and offsets/lengths for the clone operation that are multiples
# of 64Kb, so that the test works on machine with any page size.
$XFS_IO_PROG -f -s -c "pwrite -S 0x18 0 2M" $SCRATCH_MNT/foo >>$seqres.full
$XFS_IO_PROG -f -s -c "pwrite -S 0x20 0 20M" $SCRATCH_MNT/bar >>$seqres.full

# We clone from file foo into a range of file bar that overlaps the existing
# extent at file bar. The clone operation must also extend the size of file bar.
# Note: in order to trigger the original bug on btrfs, the destination file size
# must be at least 16Mb and the destination file must have been fsynced before.
$XFS_IO_PROG -c "reflink ${SCRATCH_MNT}/foo 0 19M 2M" \
	     -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