apfstests/tests/btrfs/123

#! /bin/bash
# FS QA Test 123
#
# Test if btrfs leaks qgroup numbers for data extents
#
# Due to balance code is doing trick tree block swap, which doing
# non-standard extent reference update, qgroup can't handle it correctly,
# and leads to corrupted qgroup numbers.
#
#-----------------------------------------------------------------------
# Copyright (c) 2016 Fujitsu. All Rights Reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#

seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_btrfs_qgroup_report

_scratch_mkfs
# Need to use inline extents to fill metadata rapidly
_scratch_mount "-o max_inline=2048"

# create 64K inlined metadata, which will ensure there is a 2-level
# metadata. Even for maximum nodesize(64K)
for i in $(seq 32); do
	_pwrite_byte 0xcdcdcdcd 0 2k $SCRATCH_MNT/small_$i | _filter_xfs_io
done

# then a large data write to make the quota corruption obvious enough
_pwrite_byte 0xcdcdcdcd 0 32m $SCRATCH_MNT/large | _filter_xfs_io
sync

# enable quota and rescan to get correct number
_run_btrfs_util_prog quota enable $SCRATCH_MNT
_run_btrfs_util_prog quota rescan -w $SCRATCH_MNT

# now balance data block groups to corrupt qgroup
_run_btrfs_util_prog balance start -d $SCRATCH_MNT

_scratch_unmount
# qgroup will be check at _check_scratch_fs() by fstest

# success, all done
status=0
exit