#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 188
#
# Test that an incremental send with not corrupt data when the source filesystem
# has the no-holes feature enabled, a file has prealloc (unwritten) extents that
# start after its size and hole is punched (after the first snapshot is made)
# that removes all extents from some offset up to the file's size.
#
. ./common/preamble
_begin_fstest auto quick send prealloc punch

# Override the default cleanup function.
_cleanup()
{
	cd /
	rm -f $tmp.*
	rm -fr $send_files_dir
}

# Import common functions.
. ./common/filter

# real QA test starts here
_supported_fs btrfs
_require_test
_require_scratch
_require_btrfs_fs_feature "no_holes"
_require_btrfs_mkfs_feature "no-holes"
_require_xfs_io_command "fpunch"
_require_xfs_io_command "falloc" "-k"

send_files_dir=$TEST_DIR/btrfs-test-$seq

rm -fr $send_files_dir
mkdir $send_files_dir

_scratch_mkfs "-O no-holes" >>$seqres.full 2>&1
_scratch_mount

# Create our test file with a prealloc extent that starts beyond its size.
$XFS_IO_PROG -f -c "pwrite -S 0xab 0 500K" $SCRATCH_MNT/foobar | _filter_xfs_io
$XFS_IO_PROG -c "falloc -k 1200K 800K" $SCRATCH_MNT/foobar

$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/base 2>&1 \
	| _filter_scratch

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

# Now punch a hole that drops all the extents within the file's size.
$XFS_IO_PROG -c "fpunch 0 500K" $SCRATCH_MNT/foobar

$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/incr 2>&1 \
	| _filter_scratch

$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/base -f $send_files_dir/2.snap \
	$SCRATCH_MNT/incr 2>&1 | _filter_scratch

echo "File digest in the original filesystem:"
md5sum $SCRATCH_MNT/incr/foobar | _filter_scratch

# Now recreate the filesystem by receiving both send streams and verify we get
# the same file 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
$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT

echo "File digest in the new filesystem:"
md5sum $SCRATCH_MNT/incr/foobar | _filter_scratch

status=0
exit