#! /bin/bash
# FSQA Test No. 096
#
# Test that we can not clone an inline extent into a non-zero file offset.
#
#-----------------------------------------------------------------------
#
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
# Author: Filipe Manana <fdmanana@suse.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#

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()
{
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# real QA test starts here
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_cloner

rm -f $seqres.full

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

BLOCK_SIZE=$(get_block_size $SCRATCH_MNT)

# Create our test files. File foo has the same 2k of data at offset $BLOCK_SIZE
# as file bar has at its offset 0.
$XFS_IO_PROG -f -s -c "pwrite -S 0xaa 0 $BLOCK_SIZE" \
		-c "pwrite -S 0xbb $BLOCK_SIZE 2k" \
		-c "pwrite -S 0xcc $(($BLOCK_SIZE * 2)) $BLOCK_SIZE" \
		$SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified

# File bar consists of a single inline extent (2k in size).
$XFS_IO_PROG -f -s -c "pwrite -S 0xbb 0 2k" \
		$SCRATCH_MNT/bar | _filter_xfs_io_blocks_modified

# Now call the clone ioctl to clone the extent of file bar into file
# foo at its $BLOCK_SIZE offset. This made file foo have an inline
# extent at offset $BLOCK_SIZE, something which the btrfs code can not
# deal with in future IO operations because all inline extents are
# supposed to start at an offset of 0, resulting in all sorts of
# chaos.
# So here we validate that the clone ioctl returns an EOPNOTSUPP,
# which is what it returns for other cases dealing with inlined
# extents.
$CLONER_PROG -s 0 -d $BLOCK_SIZE -l 2048 \
	$SCRATCH_MNT/bar $SCRATCH_MNT/foo

# Because of the inline extent at offset $BLOCK_SIZE, the following
# write made the kernel crash with a BUG_ON().
$XFS_IO_PROG -c "pwrite -S 0xdd $(($BLOCK_SIZE + 2048)) 2k" \
	     $SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified

status=0
exit
