apfstests/tests/btrfs/052

#! /bin/bash
# FS QA Test No. btrfs/052
#
# Verify that the btrfs ioctl clone operation can operate on the same
# file as a source and target. That is, clone extents within the same
# file.
#
#-----------------------------------------------------------------------
# Copyright (c) 2014 Filipe Manana.  All Rights Reserved.
#
# 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 -fr $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
_need_to_be_root

rm -f $seqres.full

test_btrfs_clone_same_file()
{
	if [ -z $1 ]; then
		MOUNT_OPTIONS=""
	else
		MOUNT_OPTIONS="-O $1"
	fi
	_scratch_mkfs >/dev/null 2>&1
	_scratch_mount $MOUNT_OPTIONS

	# Create a file with 5 extents, 4 of 8Kb each and 1 of 64Kb.
	$XFS_IO_PROG -f -c "pwrite -S 0x01 -b 8192 0 8192" $SCRATCH_MNT/foo \
		| _filter_xfs_io
	sync
	$XFS_IO_PROG -c "pwrite -S 0x02 -b 8192 8192 8192" $SCRATCH_MNT/foo \
		| _filter_xfs_io
	sync
	$XFS_IO_PROG -c "pwrite -S 0x03 -b 8192 16384 8192" $SCRATCH_MNT/foo \
		| _filter_xfs_io
	sync
	$XFS_IO_PROG -c "pwrite -S 0x04 -b 8192 24576 8192" $SCRATCH_MNT/foo \
		| _filter_xfs_io
	sync
	$XFS_IO_PROG -c "pwrite -S 0x05 -b 65536 32768 65536" $SCRATCH_MNT/foo \
		| _filter_xfs_io
	sync

	# Digest of initial content.
	md5sum $SCRATCH_MNT/foo | _filter_scratch

	# Same source and target ranges - must fail.
	$CLONER_PROG -s 8192 -d 8192 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo
	# Check file content didn't change.
	md5sum $SCRATCH_MNT/foo | _filter_scratch

	# Intersection between source and target ranges - must fail too.
	$CLONER_PROG -s 4096 -d 8192 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo
	# Check file content didn't change.
	md5sum $SCRATCH_MNT/foo | _filter_scratch

	# Clone an entire extent from a higher range to a lower range.
	$CLONER_PROG -s 24576 -d 0 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo

	# Check entire file, the 8Kb block at offset 0 now has the same content
	# as the 8Kb block at offset 24576.
	od -t x1 $SCRATCH_MNT/foo

	# Clone an entire extent from a lower range to a higher range.
	$CLONER_PROG -s 8192 -d 16384 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo

	# Check entire file, the 8Kb block at offset 0 now has the same content
	# as the 8Kb block at offset 24576, and the 8Kb block at offset 16384
	# now has the same content as the 8Kb block at offset 8192.
	od -t x1 $SCRATCH_MNT/foo

	# Now clone 1 extent and an half into the file range starting at offset
	# 65536. So we get the second half of the extent at offset 16384 and the
	# whole extent at 24576 cloned into the middle of the 64Kb extent that
	# starts at file offset 32768. This makes the clone ioctl process more
	# extent items from the b+tree and forces a split of the large 64Kb
	# extent at the end of the file.
	$CLONER_PROG -s 20480 -d 65536 -l 12288 $SCRATCH_MNT/foo \
		$SCRATCH_MNT/foo

	# Check entire file. Besides the previous changes, we now should have
	# 4096 bytes with the value 0x02 at file offset 65536, and 8192 bytes
	# with value 0x04 at the file offset 69632. The ranges [32768, 65536[
	# and [77824, 98304[ should remain with all bytes having the value 0x05.
	od -t x1 $SCRATCH_MNT/foo

	# Now update 8Kb of data at offset 0. The extent at this position is a
	# clone of the extent at offset 24576. Check that writing to this offset
	# doesn't change data at offset 24576.
	$XFS_IO_PROG -c "pwrite -S 0xff -b 8192 0 8192" $SCRATCH_MNT/foo \
		| _filter_xfs_io
	od -t x1 $SCRATCH_MNT/foo

	# Check that after defragmenting the file and re-mounting, the file
	# content remains exactly the same as before.
	_run_btrfs_util_prog filesystem defragment $SCRATCH_MNT/foo
	_scratch_remount
	od -t x1 $SCRATCH_MNT/foo

	# Verify that there are no consistency errors.
	_check_scratch_fs
}

# For any of the tests below, regardless of cow/nodatacow/compression, the
# results as observed by an application/user should be exactly the same.

echo "Testing with a cow file (default)"
test_btrfs_clone_same_file

_scratch_unmount

echo "Testing with a nocow file (-O nodatacow)"
test_btrfs_clone_same_file "nodatacow"

_scratch_unmount

echo "Testing with a cow file and lzo compression"
test_btrfs_clone_same_file "compress-force=lzo"

_scratch_unmount

echo "Testing with a cow file and zlib compression"
test_btrfs_clone_same_file "compress-force=zlib"

_scratch_unmount

echo "Testing with a nocow file and lzo compression"
test_btrfs_clone_same_file "nodatacow,compress-force=lzo"

_scratch_unmount

echo "Testing with a nocow file and zlib compression"
test_btrfs_clone_same_file "nodatacow,compress-force=zlib"

status=0
exit