#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2016 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/117
#
# Test that an incremental send operation which issues clone operations works
# for files that have a full path containing more than one parent directory
# component.
#
. ./common/preamble
_begin_fstest auto quick send clone

tmp=`mktemp -d`

. ./common/filter
. ./common/reflink

_supported_fs btrfs
_require_scratch
_require_cp_reflink

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

mkdir -p $SCRATCH_MNT/a/b/c
$XFS_IO_PROG -f -c "pwrite -S 0xfd 0 128K" $SCRATCH_MNT/a/b/c/x | _filter_xfs_io

_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1

# Create a bunch of small and empty files, this is just to make sure our
# subvolume's btree gets more than 1 leaf, a condition necessary to trigger a
# past bug (1000 files is enough even for a leaf/node size of 64K, the largest
# possible size).
for ((i = 1; i <= 1000; i++)); do
	echo -n > $SCRATCH_MNT/a/b/c/z_$i
done

# Create a clone of file x's extent and write some data to the middle of this
# new file, this is to guarantee the incremental send operation below issues
# a clone operation.
cp --reflink=always $SCRATCH_MNT/a/b/c/x $SCRATCH_MNT/a/b/c/y
$XFS_IO_PROG -c "pwrite -S 0xab 32K 16K" $SCRATCH_MNT/a/b/c/y | _filter_xfs_io

# Will be used as an extra source root for clone operations for the incremental
# send operation below.
_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/clones_snap

_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap2

_btrfs send -f $tmp/1.snap $SCRATCH_MNT/snap1
_btrfs send -f $tmp/clones.snap $SCRATCH_MNT/clones_snap
_btrfs send -p $SCRATCH_MNT/snap1 \
	-c $SCRATCH_MNT/clones_snap -f $tmp/2.snap $SCRATCH_MNT/snap2

echo "File digests in the original filesystem:"
md5sum $SCRATCH_MNT/snap1/a/b/c/x | _filter_scratch
md5sum $SCRATCH_MNT/snap2/a/b/c/x | _filter_scratch
md5sum $SCRATCH_MNT/snap2/a/b/c/y | _filter_scratch

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

_btrfs receive -f $tmp/1.snap $SCRATCH_MNT
_btrfs receive -f $tmp/clones.snap $SCRATCH_MNT
_btrfs receive -f $tmp/2.snap $SCRATCH_MNT

echo "File digests in the new filesystem:"
# Should match the digests we had in the original filesystem.
md5sum $SCRATCH_MNT/snap1/a/b/c/x | _filter_scratch
md5sum $SCRATCH_MNT/snap2/a/b/c/x | _filter_scratch
md5sum $SCRATCH_MNT/snap2/a/b/c/y | _filter_scratch

status=0
exit