#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2021 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 251
#
# Test if btrfs will crash when using compress-force mount option against
# incompressible data
#
. ./common/preamble
_begin_fstest auto quick compress dangerous

. ./common/filter

_supported_fs btrfs
_require_scratch

pagesize=$(_get_page_size)

# Read the content from urandom to a known safe location
$XFS_IO_PROG -f -c "pwrite -i /dev/urandom 0 $pagesize" "$tmp.good" > /dev/null

# Make sure we didn't get short write
if [ $(_get_filesize "$tmp.good") != "$pagesize" ]; then
	_fail "Got a short read from /dev/urandom"
fi

workload()
{
	local compression=$1

	echo "=== Testing compress-force=$compression ==="
	_scratch_mkfs -s "$pagesize">> $seqres.full
	_scratch_mount -o compress-force="$compression"
	cp "$tmp.good" "$SCRATCH_MNT/$compression"

	# When unpatched, compress-force=lzo would crash at data writeback
	_scratch_cycle_mount

	# Make sure the content matches
	if [ "$(_md5_checksum $tmp.good)" != \
	     "$(_md5_checksum $SCRATCH_MNT/$compression)" ]; then
		echo "Content of '$SCRATCH_MNT/file' mismatch with known good copy"
	else
		echo "OK"
	fi
	_scratch_unmount
}

workload lzo
workload zstd
workload zlib

# success, all done
status=0
exit