#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Filipe Manana.  All Rights Reserved.
#
# FS QA Test No. btrfs/039
#
# Regression test for a btrfs incremental send issue related to renaming of
# directories. If at the time of the initial send we have a directory that is
# a child of a directory with a higher inode number, and then later after the
# initial full send we rename both the child and parent directories, but
# without moving any of them, a subsequent incremental send would produce a
# rename instruction for the child directory that pointed to an invalid path.
# This made the btrfs receive operation fail.
#
# This issue is fixed by the following linux kernel btrfs patch:
#
#   Btrfs: incremental send, fix invalid path after dir rename
#
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 $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

rm -f $seqres.full

_scratch_mkfs >/dev/null 2>&1
_scratch_mount

mkdir -p $SCRATCH_MNT/a/b
mkdir $SCRATCH_MNT/d
mkdir $SCRATCH_MNT/a/b/c
mv $SCRATCH_MNT/d $SCRATCH_MNT/a/b/c
mkdir $SCRATCH_MNT/e
mkdir -p $SCRATCH_MNT/a/b/f/g
mv $SCRATCH_MNT/e $SCRATCH_MNT/a/b/f/g

# Filesystem looks like:
#
# .                      (ino 256)
# |-- a                  (ino 257)
#     |-- b              (ino 258)
#         |-- c          (ino 260)
#         |   |-- d      (ino 259)
#         |
#         |-- f          (ino 262)
#             |-- g      (ino 263)
#                 |-- e  (ino 261)

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1

mv $SCRATCH_MNT/a/b/c $SCRATCH_MNT/a/b/x
mv $SCRATCH_MNT/a/b/x/d $SCRATCH_MNT/a/b/x/y
mv $SCRATCH_MNT/a/b/f $SCRATCH_MNT/a/b/w
mv $SCRATCH_MNT/a/b/w/g/e $SCRATCH_MNT/a/b/w/g/z

# Filesystem now looks like:
#
# .                      (ino 256)
# |-- a                  (ino 257)
#     |-- b              (ino 258)
#         |-- x          (ino 260)
#         |   |-- y      (ino 259)
#         |
#         |-- w          (ino 262)
#             |-- g      (ino 263)
#                 |-- z  (ino 261)

_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 \
	$SCRATCH_MNT/mysnap2

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

_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV

_scratch_mkfs >/dev/null 2>&1
_scratch_mount

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

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

_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV

status=0
exit