#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2022 Synology Inc. All Rights Reserved.
#
# FS QA Test No. 264
#
# Compression and nodatacow are mutually exclusive. Besides ioctl, there
# is another way to setting compression via xattrs, and shouldn't produce
# invalid combinations.
#
# To prevent mix any compression-related options with nodatacow, FS_NOCOMP_FL
# is also rejected by ioctl as well as FS_COMPR_FL on nodatacow files. To
# align with it, no and none are also unacceptable in this test.
#
# The regression is fixed by a patch with the following subject:
#   btrfs: do not allow compression on nodatacow files
#
. ./common/preamble
_begin_fstest auto quick compress attr

. ./common/filter
. ./common/attr

_require_scratch
_require_attrs
_require_chattr C

_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

set_compression() # $1: filename, $2: alg
{
	[ -f "$1" ] || return
	$SETFATTR_PROG -n "btrfs.compression" -v "$2" "$1" |& _filter_scratch
}

# FS_NOCOMP_FL bit isn't recognized by chattr/lsattr before e2fsprogs 1.46.2
# In order to make this test available with an older version, we wrap the output
# of lsattr to distinguish FS_COMP_FL and FS_NOCOMP_FL
check_compression() # $1: filename
{
	$LSATTR_PROG -l "$1" | grep -q "Compression_Requested"

	if [ $? -eq 0 ]; then
		echo "$1: Compression is set" | _filter_scratch
	else
		echo "$1: Compression is not set" | _filter_scratch
	fi
}

#
# DATACOW
#
test_file="$SCRATCH_MNT/foo"
touch "$test_file"
$CHATTR_PROG -C "$test_file"

set_compression "$test_file" zlib
check_compression "$test_file"
set_compression "$test_file" no
check_compression "$test_file"
set_compression "$test_file" lzo
check_compression "$test_file"
set_compression "$test_file" none
check_compression "$test_file"
set_compression "$test_file" zstd
check_compression "$test_file"

#
# NODATACOW
#
test_file="$SCRATCH_MNT/bar"
touch "$test_file"
$CHATTR_PROG +C "$test_file"

# all valid compression type are not allowed on nodatacow files
set_compression "$test_file" zlib
set_compression "$test_file" lzo
set_compression "$test_file" zstd

# no/none are also not allowed on nodatacow files
set_compression "$test_file" no
set_compression "$test_file" none

# success, all done
status=0
exit