#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2022 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 259
#
# Make sure btrfs defrag ioctl won't defrag compressed extents which are already
# at their max capacity.
#
. ./common/preamble
_begin_fstest auto quick defrag fiemap compress

. ./common/filter

_supported_fs btrfs
_require_scratch
_require_xfs_io_command "fiemap"

_scratch_mkfs >> $seqres.full

_scratch_mount -o compress

# Btrfs uses 128K as max extent size for compressed extents, this would result
# several compressed extents all at their max size
$XFS_IO_PROG -f -c "pwrite -S 0xee 0 16m" -c sync \
	$SCRATCH_MNT/foobar >> $seqres.full

old_csum=$(_md5_checksum $SCRATCH_MNT/foobar)

echo "=== File extent layout before defrag ===" >> $seqres.full
$XFS_IO_PROG -c "fiemap -v" "$SCRATCH_MNT/foobar" >> $seqres.full
$XFS_IO_PROG -c "fiemap -v" "$SCRATCH_MNT/foobar" > $tmp.before

$BTRFS_UTIL_PROG filesystem defrag "$SCRATCH_MNT/foobar" >> $seqres.full
sync

new_csum=$(_md5_checksum $SCRATCH_MNT/foobar)

echo "=== File extent layout after defrag ===" >> $seqres.full
$XFS_IO_PROG -c "fiemap -v" "$SCRATCH_MNT/foobar" >> $seqres.full
$XFS_IO_PROG -c "fiemap -v" "$SCRATCH_MNT/foobar" > $tmp.after

if [ $new_csum != $old_csum ]; then
	echo "file content changed"
fi

diff -q $tmp.before $tmp.after || echo "compressed extents get defragged"

echo "Silence is golden"

# success, all done
status=0
exit