#! /bin/bash
# FS QA Test No. btrfs/038
#
# Test for a btrfs incremental send issue where we end up sending a
# wrong section of data from a file extent if the corresponding file
# extent is compressed and the respective file extent item has a non
# zero data offset.
#
# Fixed by the following linux kernel btrfs patch:
#
#   Btrfs: use right clone root offset for compressed extents
#
#-----------------------------------------------------------------------
# Copyright (c) 2014 Filipe Manana.  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=`mktemp -d`
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
    rm -fr $tmp
}

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

# real QA test starts here
_supported_fs btrfs
_supported_os Linux
_require_scratch
_need_to_be_root

FSSUM_PROG=$here/src/fssum
[ -x $FSSUM_PROG ] || _notrun "fssum not built"

rm -f $seqres.full

_scratch_mkfs >/dev/null 2>&1
_scratch_mount "-o compress-force=lzo"

$XFS_IO_PROG -f -c "truncate 118811" $SCRATCH_MNT/foo
$XFS_IO_PROG -c "pwrite -S 0x0d -b 39987 92267 39987" \
	$SCRATCH_MNT/foo | _filter_xfs_io

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT \
	$SCRATCH_MNT/mysnap1

$XFS_IO_PROG -c "pwrite -S 0x3e -b 80000 200000 80000" \
	$SCRATCH_MNT/foo | _filter_xfs_io

# Sync to avoid btrfs merging file extent items, which would make the test
# succeed when it should fail.
_run_btrfs_util_prog filesystem sync $SCRATCH_MNT

$XFS_IO_PROG -c "pwrite -S 0xdc -b 10000 250000 10000" \
	$SCRATCH_MNT/foo | _filter_xfs_io
$XFS_IO_PROG -c "pwrite -S 0xff -b 10000 300000 10000" \
	$SCRATCH_MNT/foo | _filter_xfs_io

# will be used for incremental send to be able to issue clone operations
_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT \
	$SCRATCH_MNT/clones_snap

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT \
	$SCRATCH_MNT/mysnap2

run_check $FSSUM_PROG -A -f -w $tmp/1.fssum $SCRATCH_MNT/mysnap1
run_check $FSSUM_PROG -A -f -w $tmp/2.fssum -x $SCRATCH_MNT/mysnap2/mysnap1 \
	-x $SCRATCH_MNT/mysnap2/clones_snap $SCRATCH_MNT/mysnap2
run_check $FSSUM_PROG -A -f -w $tmp/clones.fssum $SCRATCH_MNT/clones_snap \
	-x $SCRATCH_MNT/clones_snap/mysnap1 -x $SCRATCH_MNT/clones_snap/mysnap2

_run_btrfs_util_prog send $SCRATCH_MNT/mysnap1 -f $tmp/1.snap
_run_btrfs_util_prog send $SCRATCH_MNT/clones_snap -f $tmp/clones.snap
_run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 \
	-c $SCRATCH_MNT/clones_snap $SCRATCH_MNT/mysnap2 -f $tmp/2.snap

_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV

_scratch_mkfs >/dev/null 2>&1
_scratch_mount

_run_btrfs_util_prog receive $SCRATCH_MNT -f $tmp/1.snap
run_check $FSSUM_PROG -r $tmp/1.fssum $SCRATCH_MNT/mysnap1 2>> $seqres.full

_run_btrfs_util_prog receive $SCRATCH_MNT -f $tmp/clones.snap
run_check $FSSUM_PROG -r $tmp/clones.fssum $SCRATCH_MNT/clones_snap 2>> $seqres.full

_run_btrfs_util_prog receive $SCRATCH_MNT -f $tmp/2.snap
run_check $FSSUM_PROG -r $tmp/2.fssum $SCRATCH_MNT/mysnap2 2>> $seqres.full

_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV

status=0
exit