#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2017 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/137
#
# Test that both incremental and full send operations preserve file holes.
#
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
. ./common/punch

# real QA test starts here
_supported_fs btrfs
_supported_os Linux
_require_test
_require_scratch
_require_xfs_io_command "fiemap"

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

# Create the first test file.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0 4K" $SCRATCH_MNT/foo | _filter_xfs_io

# Create a second test file with a 1Mb hole.
$XFS_IO_PROG -f \
     -c "pwrite -S 0xaa 0 4K" \
     -c "pwrite -S 0xbb 1028K 4K" \
     $SCRATCH_MNT/bar | _filter_xfs_io

$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
	$SCRATCH_MNT/snap1 >/dev/null

# Now add one new extent to our first test file, increasing its size and leaving
# a 1Mb hole between the first extent and this new extent.
$XFS_IO_PROG -c "pwrite -S 0xbb 1028K 4K" $SCRATCH_MNT/foo | _filter_xfs_io

# Now overwrite the last extent of our second test file.
$XFS_IO_PROG -c "pwrite -S 0xcc 1028K 4K" $SCRATCH_MNT/bar | _filter_xfs_io

$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
		 $SCRATCH_MNT/snap2 >/dev/null

echo
echo "File digests in the original filesystem:"
md5sum $SCRATCH_MNT/snap1/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap1/bar | _filter_scratch
md5sum $SCRATCH_MNT/snap2/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap2/bar | _filter_scratch

echo
echo "File snap1/foo fiemap results in the original filesystem:"
$XFS_IO_PROG -r -c "fiemap -v" $SCRATCH_MNT/snap1/foo | _filter_fiemap
echo
echo "File snap1/bar fiemap results in the original filesystem:"
$XFS_IO_PROG -r -c "fiemap -v" $SCRATCH_MNT/snap1/bar | _filter_fiemap
echo
echo "File snap2/foo fiemap results in the original filesystem:"
$XFS_IO_PROG -r -c "fiemap -v" $SCRATCH_MNT/snap2/foo | _filter_fiemap
echo
echo "File snap2/bar fiemap results in the original filesystem:"
$XFS_IO_PROG -r -c "fiemap -v" $SCRATCH_MNT/snap2/bar | _filter_fiemap
echo

# Create the send streams to apply later on a new filesystem.
$BTRFS_UTIL_PROG send -f $send_files_dir/1.snap $SCRATCH_MNT/snap1 2>&1 \
	| _filter_scratch
$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/snap1 -f $send_files_dir/2.snap \
	$SCRATCH_MNT/snap2 2>&1 | _filter_scratch

# Create a new filesystem, receive the send streams and verify that the file
# contents are the same as in the original filesystem and that the file holes
# exists in both snapshots.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
$BTRFS_UTIL_PROG receive -f $send_files_dir/1.snap $SCRATCH_MNT >/dev/null
$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT >/dev/null

echo
echo "File digests in the new filesystem:"
md5sum $SCRATCH_MNT/snap1/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap1/bar | _filter_scratch
md5sum $SCRATCH_MNT/snap2/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap2/bar | _filter_scratch

echo
echo "File snap1/foo fiemap results in the new filesystem:"
$XFS_IO_PROG -r -c "fiemap -v" $SCRATCH_MNT/snap1/foo | _filter_fiemap
echo
echo "File snap1/bar fiemap results in the new filesystem:"
$XFS_IO_PROG -r -c "fiemap -v" $SCRATCH_MNT/snap1/bar | _filter_fiemap
echo
echo "File snap2/foo fiemap results in the new filesystem:"
$XFS_IO_PROG -r -c "fiemap -v" $SCRATCH_MNT/snap2/foo | _filter_fiemap
echo
echo "File snap2/bar fiemap results in the new filesystem:"
$XFS_IO_PROG -r -c "fiemap -v" $SCRATCH_MNT/snap2/bar | _filter_fiemap

status=0
exit