tests/btrfs/274

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2022 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 274
#
# Test that we can not delete a subvolume that has an active swap file.
#
. ./common/preamble
_begin_fstest auto quick swap subvol

_cleanup()
{
	cd /
	rm -f $tmp.*
	test -n "$swap_file" && swapoff $swap_file &> /dev/null
}

. ./common/filter

_fixed_by_kernel_commit 60021bd754c6ca \
    "btrfs: prevent subvol with swapfile from being deleted"
_require_scratch_swapfile

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

swap_file="$SCRATCH_MNT/subvol/swap"
$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/subvol | _filter_scratch

echo "Creating and activating swap file..."
_format_swapfile $swap_file $(($(_get_page_size) * 32)) >> $seqres.full
_swapon_file $swap_file

echo "Attempting to delete subvolume with swap file enabled..."
# Output differs with different btrfs-progs versions and some display multiple
# lines on failure like this for example:
#
#   ERROR: Could not destroy subvolume/snapshot: Operation not permitted
#   WARNING: deletion failed with EPERM, send may be in progress
#   Delete subvolume (no-commit): '/home/fdmanana/btrfs-tests/scratch_1/subvol'
#
# So just redirect all output to the .full file and check the command's exit
# status instead.
$BTRFS_UTIL_PROG subvolume delete $SCRATCH_MNT/subvol >> $seqres.full 2>&1 && \
    echo "subvolume deletion successful, expected failure!"

echo "Disabling swap file..."
swapoff $swap_file

echo "Attempting to delete subvolume after disabling swap file..."
$BTRFS_UTIL_PROG subvolume delete $SCRATCH_MNT/subvol >> $seqres.full 2>&1 || \
   echo "subvolume deletion failure, expected success!"

# success, all done
status=0
exit