tests/btrfs/174

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Facebook.  All Rights Reserved.
#
# FS QA Test 174
#
# Test restrictions on operations that can be done on an active swap file
# specific to Btrfs.
#
. ./common/preamble
_begin_fstest auto quick swap compress

. ./common/filter

_require_scratch_swapfile

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

$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/swapvol" >> $seqres.full
swapfile="$SCRATCH_MNT/swapvol/swap"
_format_swapfile "$swapfile" $(($(_get_page_size) * 10)) > /dev/null
swapon "$swapfile"

# Turning off nocow doesn't do anything because the file is not empty, not
# because the file is a swap file, but make sure this works anyways.
echo "Disable nocow"
$CHATTR_PROG -C "$swapfile"
$LSATTR_PROG -l "$swapfile" | _filter_scratch | _filter_spaces

# Compression we reject outright.
echo "Enable compression"
$CHATTR_PROG +c "$swapfile" 2>&1 | grep -o "Invalid argument while setting flags"
$LSATTR_PROG -l "$swapfile" | _filter_scratch | _filter_spaces

echo "Snapshot"
$BTRFS_UTIL_PROG subvolume snapshot "$SCRATCH_MNT/swapvol" \
	"$SCRATCH_MNT/swapsnap" 2>&1 | grep -o "Text file busy"

echo "Defrag"
# We pass the -c (compress) flag to force defrag even if the file isn't
# fragmented.
$BTRFS_UTIL_PROG filesystem defrag -c "$swapfile" 2>&1 | grep -o "Text file busy"

swapoff "$swapfile"
_scratch_unmount

status=0
exit