#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Filipe Manana.  All Rights Reserved.
#
# FS QA Test No. btrfs/034
#
# Test for a btrfs incremental send data corruption issue due to
# bad detection of file holes.
#
. ./common/preamble
_begin_fstest auto quick send prealloc

tmp=`mktemp -d`

# Override the default cleanup function.
_cleanup()
{
    rm -fr $tmp
}

. ./common/filter

_supported_fs btrfs
_require_scratch
_require_xfs_io_command "falloc"

_scratch_mkfs >/dev/null 2>&1
_scratch_mount

# Create a file such that its file extent items span at least 3 btree leafs.
# This is necessary to trigger a btrfs incremental send bug where file hole
# detection was not correct, leading to data corruption by overriding latest
# data regions of a file with zeroes.

$XFS_IO_PROG -f -c "truncate 104857600" $SCRATCH_MNT/foo

for ((i = 0; i < 940; i++))
do
	OFFSET=$((32768 + i * 8192))
	LEN=$((OFFSET + 8192))
	$XFS_IO_PROG -c "falloc -k $OFFSET $LEN" $SCRATCH_MNT/foo
	$XFS_IO_PROG -c "pwrite -S 0xf0 $OFFSET 4096" \
		$SCRATCH_MNT/foo | _filter_xfs_io
done

_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1

$XFS_IO_PROG -c "truncate 3882008" $SCRATCH_MNT/foo

_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2

_btrfs send -f $tmp/1.snap $SCRATCH_MNT/mysnap1
_btrfs send -f $tmp/2.snap -p $SCRATCH_MNT/mysnap1 \
	$SCRATCH_MNT/mysnap2

md5sum $SCRATCH_MNT/foo | _filter_scratch
md5sum $SCRATCH_MNT/mysnap1/foo | _filter_scratch
md5sum $SCRATCH_MNT/mysnap2/foo | _filter_scratch

_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV
_scratch_mkfs >/dev/null 2>&1
_scratch_mount

_btrfs receive -f $tmp/1.snap $SCRATCH_MNT
md5sum $SCRATCH_MNT/mysnap1/foo | _filter_scratch

_btrfs receive -f $tmp/2.snap $SCRATCH_MNT
md5sum $SCRATCH_MNT/mysnap2/foo | _filter_scratch

_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV

status=0
exit