#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2017 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/155
#
# Test that an incremental send operation works if a file that has multiple
# hard links has some of its hard links renamed in the send snapshot, with one
# of them getting the same path that some other inode had in the send snapshot.
#
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
_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
touch $SCRATCH_MNT/a/f1
mkdir -p $SCRATCH_MNT/a/b/c
ln $SCRATCH_MNT/a/f1 $SCRATCH_MNT/a/b/c/f1l1
touch $SCRATCH_MNT/a/b/f2
mkdir $SCRATCH_MNT/d
mv $SCRATCH_MNT/a/b/c/f1l1 $SCRATCH_MNT/d/f1l1_2
ln $SCRATCH_MNT/a/b/f2 $SCRATCH_MNT/a/f2l1
ln $SCRATCH_MNT/a/b/f2 $SCRATCH_MNT/d/f2l2
mv $SCRATCH_MNT/a/f1 $SCRATCH_MNT/d/f1_2

# Filesystem looks like:
#
# .                                                      (ino 256)
# |---- a/                                               (ino 257)
# |     |---- b/                                         (ino 259)
# |     |     |---- c/                                   (ino 260)
# |     |     |---- f2                                   (ino 261)
# |     |
# |     |---- f2l1                                       (ino 261)
# |
# |---- d/                                               (ino 262)
#       |---- f1l1_2                                     (ino 258)
#       |---- f2l2                                       (ino 261)
#       |---- f1_2                                       (ino 258)
#
$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
	$SCRATCH_MNT/mysnap1 > /dev/null

$BTRFS_UTIL_PROG send -f $send_files_dir/1.snap \
	$SCRATCH_MNT/mysnap1 2>&1 1>/dev/null | _filter_scratch

mv $SCRATCH_MNT/d $SCRATCH_MNT/a/b/d2
mv $SCRATCH_MNT/a/f2l1 $SCRATCH_MNT/d
mkdir $SCRATCH_MNT/a/f2l1
ln $SCRATCH_MNT/a/b/d2/f1_2 $SCRATCH_MNT/a/b/f1l2
mv $SCRATCH_MNT/a/b $SCRATCH_MNT/a/f2l1/b2
mv $SCRATCH_MNT/a/f2l1/b2/d2 $SCRATCH_MNT/a/f2l1/b2/c/d3
mv $SCRATCH_MNT/a/f2l1/b2/c/d3/f2l2 $SCRATCH_MNT/a/f2l1/b2/c/d3/f2l2_2

# Filesystem now looks like:
#
# .                                                      (ino 256)
# |---- a/                                               (ino 257)
# |     |---- f2l1/                                      (ino 263)
# |             |---- b2/                                (ino 259)
# |                   |---- c/                           (ino 260)
# |                   |     |---- d3                     (ino 262)
# |                   |           |---- f1l1_2           (ino 258)
# |                   |           |---- f2l2_2           (ino 261)
# |                   |           |---- f1_2             (ino 258)
# |                   |
# |                   |---- f2                           (ino 261)
# |                   |---- f1l2                         (ino 258)
# |
# |---- d                                                (ino 261)
#

$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
		 $SCRATCH_MNT/mysnap2 > /dev/null
$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \
		 $SCRATCH_MNT/mysnap2 2>&1 1>/dev/null | _filter_scratch

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

$BTRFS_UTIL_PROG receive -f $send_files_dir/1.snap $SCRATCH_MNT > /dev/null
# The incremental send operation below used to issue an unlink operation for the
# path "d/f2l1" after it orphanized inode 262 (renamed it to o262-7-0) and after
# it created the link named "d" for inode 261, which made the receiver fail on
# the unlink operation with error code ENOTDIR. That unlink operation should
# have had the path "o262-7-0/f2l2" instead.
$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT > /dev/null
$FSSUM_PROG -r $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
$FSSUM_PROG -r $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2

status=0
exit