#! /bin/bash
# FS QA Test No. btrfs/117
#
# Test that an incremental send operation which issues clone operations works
# for files that have a full path containing more than one parent directory
# component.
#
#-----------------------------------------------------------------------
#
# Copyright (C) 2016 SUSE Linux Products GmbH. All Rights Reserved.
# Author: Filipe Manana <fdmanana@suse.com>
#
# 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"

tmp=`mktemp -d`
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
. ./common/reflink

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

rm -f $seqres.full

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

mkdir -p $SCRATCH_MNT/a/b/c
$XFS_IO_PROG -f -c "pwrite -S 0xfd 0 128K" $SCRATCH_MNT/a/b/c/x | _filter_xfs_io

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1

# Create a bunch of small and empty files, this is just to make sure our
# subvolume's btree gets more than 1 leaf, a condition necessary to trigger a
# past bug (1000 files is enough even for a leaf/node size of 64K, the largest
# possible size).
for ((i = 1; i <= 1000; i++)); do
	echo -n > $SCRATCH_MNT/a/b/c/z_$i
done

# Create a clone of file x's extent and write some data to the middle of this
# new file, this is to guarantee the incremental send operation below issues
# a clone operation.
cp --reflink=always $SCRATCH_MNT/a/b/c/x $SCRATCH_MNT/a/b/c/y
$XFS_IO_PROG -c "pwrite -S 0xab 32K 16K" $SCRATCH_MNT/a/b/c/y | _filter_xfs_io

# Will be used as an extra source root for clone operations for the incremental
# send operation below.
_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/clones_snap

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap2

_run_btrfs_util_prog send $SCRATCH_MNT/snap1 -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/snap1 \
	-c $SCRATCH_MNT/clones_snap $SCRATCH_MNT/snap2 -f $tmp/2.snap

echo "File digests in the original filesystem:"
md5sum $SCRATCH_MNT/snap1/a/b/c/x | _filter_scratch
md5sum $SCRATCH_MNT/snap2/a/b/c/x | _filter_scratch
md5sum $SCRATCH_MNT/snap2/a/b/c/y | _filter_scratch

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

_run_btrfs_util_prog receive $SCRATCH_MNT -f $tmp/1.snap
_run_btrfs_util_prog receive $SCRATCH_MNT -f $tmp/clones.snap
_run_btrfs_util_prog receive $SCRATCH_MNT -f $tmp/2.snap

echo "File digests in the new filesystem:"
# Should match the digests we had in the original filesystem.
md5sum $SCRATCH_MNT/snap1/a/b/c/x | _filter_scratch
md5sum $SCRATCH_MNT/snap2/a/b/c/x | _filter_scratch
md5sum $SCRATCH_MNT/snap2/a/b/c/y | _filter_scratch

status=0
exit