#! /bin/bash
# FS QA Test No. 017
#
# Verify that removing shared extents can end up incorrect qgroup accounting.
#
# Regression of 'commit fcebe4562dec ("Btrfs: rework qgroup accounting")',
# this will throw a warning into dmesg.
#
# The issue is fixed by https://patchwork.kernel.org/patch/5499981/
# "Btrfs: fix a warning of qgroup account on shared extents"
#
#-----------------------------------------------------------------------
# Copyright (c) 2014 Liu Bo.  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

# real QA test starts here

_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_cloner

rm -f $seqres.full

# Currently in btrfs the node/leaf size can not be smaller than the page
# size (but it can be greater than the page size). So use the largest
# supported node/leaf size (64Kb) so that the test can run on any platform
# that Linux supports.
_scratch_mkfs "--nodesize 65536" >>$seqres.full 2>&1
_scratch_mount

BLOCK_SIZE=$(get_block_size $SCRATCH_MNT)
EXTENT_SIZE=$((2 * $BLOCK_SIZE))

$XFS_IO_PROG -f -d -c "pwrite 0 $EXTENT_SIZE" $SCRATCH_MNT/foo \
	| _filter_xfs_io_blocks_modified

_run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT $SCRATCH_MNT/snap

$CLONER_PROG -s 0 -d 0 -l $EXTENT_SIZE $SCRATCH_MNT/foo $SCRATCH_MNT/foo-reflink

$CLONER_PROG -s 0 -d 0 -l $EXTENT_SIZE $SCRATCH_MNT/foo \
	     $SCRATCH_MNT/snap/foo-reflink

$CLONER_PROG -s 0 -d 0 -l $EXTENT_SIZE $SCRATCH_MNT/foo \
	     $SCRATCH_MNT/snap/foo-reflink2

_run_btrfs_util_prog quota enable $SCRATCH_MNT
_run_btrfs_util_prog quota rescan -w $SCRATCH_MNT

rm -fr $SCRATCH_MNT/foo*
rm -fr $SCRATCH_MNT/snap/foo*

sync

units=`_btrfs_qgroup_units`
$BTRFS_UTIL_PROG qgroup show $units $SCRATCH_MNT | $AWK_PROG '/[0-9]/ {print $2" "$3}'

# success, all done
status=0
exit
