#! /bin/bash
# FS QA Test No. btrfs/084
#
# Test for incremental send where the difference between the parent and send
# snapshots is that for a subtree with the same path in both snapshots (p1/p2),
# the root directories were swapped.
#
# This issue was fixed by the following linux kernel btrfs patch:
#
#   Btrfs: incremental send, clear name from cache after orphanization
#
#-----------------------------------------------------------------------
# Copyright (C) 2015 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=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	rm -fr $send_files_dir
	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_fssum

send_files_dir=$TEST_DIR/btrfs-test-$seq

rm -f $seqres.full
rm -fr $send_files_dir
mkdir $send_files_dir

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

mkdir -p $SCRATCH_MNT/data/n1/n2/p1/p2
mkdir $SCRATCH_MNT/data/n4
mkdir -p $SCRATCH_MNT/data/p1/p2

# Filesystem looks like:
#
# .                                       (ino 256)
# |---- data                              (ino 257)
#         |---- n1/                       (ino 258)
#         |     |---- n2/                 (ino 259)
#         |           |---- p1/           (ino 260)
#         |                 |---- p2/     (ino 261)
#         |
#         |---- n4/                       (ino 262)
#         |---- p1/                       (ino 263)
#               |---- p2/                 (ino 264)
#
_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1

# Now move directories around such that for the subtrees with the path "p1/p2"
# we end up swapping the parents, that is, inode 263 becomes the parent of
# inode 261 and inode 260 becomes the parent of inode 264. This makes the send
# stream orphanize the inodes 263 and 264, and we want to verify the respective
# rename operations don't fail, that they don't use incorrect paths.
mv $SCRATCH_MNT/data/p1/p2 $SCRATCH_MNT/data
mv $SCRATCH_MNT/data/n1/n2/p1/p2 $SCRATCH_MNT/data/p1
mv $SCRATCH_MNT/data/p2 $SCRATCH_MNT/data/n1/n2/p1
mv $SCRATCH_MNT/data/n1/n2 $SCRATCH_MNT/data/p1
mv $SCRATCH_MNT/data/p1 $SCRATCH_MNT/data/n4
mv $SCRATCH_MNT/data/n4/p1/n2/p1 $SCRATCH_MNT/data

# Filesystem now looks like:
#
# .                                       (ino 256)
# |---- data                              (ino 257)
#         |---- n1/                       (ino 258)
#         |---- n4/                       (ino 262)
#         |     |---- p1/                 (ino 263)
#         |           |---- n2/           (ino 259)
#         |           |---- p2/           (ino 261)
#         |
#         |---- p1/                       (ino 260)
#               |---- p2/                 (ino 264)
#
_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2

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

_run_btrfs_util_prog send $SCRATCH_MNT/mysnap1 -f $send_files_dir/1.snap
_run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 $SCRATCH_MNT/mysnap2 \
	-f $send_files_dir/2.snap

# Now recreate the filesystem by receiving both send streams and verify we get
# the same content that the original filesystem had.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/1.snap
run_check $FSSUM_PROG -r $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/2.snap
run_check $FSSUM_PROG -r $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2

echo "Silence is golden"
status=0
exit
