#! /bin/bash
# FS QA Test No. btrfs/077
#
# Regression test for a btrfs incremental send issue.
# If between two snapshots we rename an existing directory named X to Y and
# make it a child (direct or not) of a new inode named X, we were delaying
# the move/rename of the former directory unnecessarily, which would result
# in attempting to rename the new directory from its orphan name to name X
# prematurely. This made btrfs receive fail with an error message like the
# following:
#
#   rename o261-7-0 -> merlin/RC/OSD failed
#
# This issue was a regression in the 3.16 kernel and got fixed by the following
# linux kernel btrfs patch:
#
#   Btrfs: send, don't delay dir move if there's a new parent inode
#
#-----------------------------------------------------------------------
# Copyright (C) 2014 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()
{
    rm -fr $send_files_dir
    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
_require_fssum
_need_to_be_root

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/merlin/RC/OSD/Source
mkdir -p $SCRATCH_MNT/fdm/RCz/OSDz/Sourcez
mkdir -p $SCRATCH_MNT/Z/Z2

# Filesystem looks like:
#
# .                                                 (ino 256)
# |---- merlin/                                     (ino 257)
# |        |---- RC/                                (ino 258)
# |              |----- OSD/                        (ino 259)
# |                      |---- Source/              (ino 260)
# |
# |---- fdm/                                        (ino 261)
# |       |---- RCz/                                (ino 262)
# |             |----- OSDz/                        (ino 263)
# |                     |---- Sourcez/              (ino 264)
# |
# |---- Z/                                          (ino 265)
#       |---- Z2/                                   (ino 266)
#
_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1

mkdir $SCRATCH_MNT/OSD
mv $SCRATCH_MNT/merlin/RC/OSD $SCRATCH_MNT/OSD/OSD-Plane_788
mv $SCRATCH_MNT/OSD $SCRATCH_MNT/merlin/RC

mkdir $SCRATCH_MNT/OSDz
mv $SCRATCH_MNT/Z/Z2 $SCRATCH_MNT/OSDz/xz2
mv $SCRATCH_MNT/Z $SCRATCH_MNT/OSDz/xz2/xz
mv $SCRATCH_MNT/fdm/RCz/OSDz $SCRATCH_MNT/OSDz/xz2/xz/OSD-Plane_788z
mv $SCRATCH_MNT/OSDz $SCRATCH_MNT/fdm/RCz

# Filesystem now looks like:
#
#
# .                                                                  (ino 256)
# |---- merlin/                                                      (ino 257)
# |       |---- RC/                                                  (ino 258)
# |             |----- OSD/                                     (ino 267) (new)
# |                     |---- OSD-Plane_788/                         (ino 259)
# |                                    |---- Source/                 (ino 260)
# |
# |---- fdm/                                                         (ino 261)
#         |---- RCz/                                                 (ino 262)
#                |----- OSDz/                                   (ino 268) (new)
#                        |--- xz2/                                   (ino 266)
#                              |---- xz/                             (ino 265)
#                                    |---- OSD-Plane_788z/           (ino 263)
#                                                    |---- Sourcez/  (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

_check_scratch_fs

_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