#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2016 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/129
#
# Test that an incremental send operation does not prematurely issues rmdir
# operations under a particular scenario (the rmdir operation is sent before
# the target directory is empty).
#
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()
{
	cd /
	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_test
_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 $SCRATCH_MNT/a
mkdir $SCRATCH_MNT/tmp
mkdir $SCRATCH_MNT/del
mv $SCRATCH_MNT/tmp $SCRATCH_MNT/del
mkdir $SCRATCH_MNT/a/c
mkdir $SCRATCH_MNT/del/x

# Filesystem looks like:
#
# .                                                             (ino 256)
# |--- a/                                                       (ino 257)
# |    |--- c/                                                  (ino 260)
# |
# |--- del/                                                     (ino 259)
#       |--- tmp/                                               (ino 258)
#       |--- x/                                                 (ino 261)
#
_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1

# When inode 260 was processed, rename operations for it and for inode 258 were
# issued (the rename for inode 260 must happen before the rename for inode 258).
# Then immediately after issuing the rename operation for inode 258, and before
# inode 261 was processed, the send stream issued a rmdir operation for inode
# 260, which would make the receiver fail with the error ENOTEMPTY because inode
# 261 was not yet renamed, it was still a child of inode 260 at that time.
#
mv $SCRATCH_MNT/a/c $SCRATCH_MNT
mv $SCRATCH_MNT/del/x $SCRATCH_MNT/a
mv $SCRATCH_MNT/del/tmp $SCRATCH_MNT/c
rmdir $SCRATCH_MNT/del

# Filesystem now looks like:
#
# .                                                             (ino 256)
# |--- a/                                                       (ino 257)
# |    |--- x/                                                  (ino 261)
# |
# |--- c/                                                       (ino 260)
#      |--- tmp/                                                (ino 258)
#
_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 -f $send_files_dir/1.snap $SCRATCH_MNT/mysnap1
_run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \
	$SCRATCH_MNT/mysnap2

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

echo "Silence is golden"
status=0
exit