tests/ext4/020

#! /bin/bash
# FS QA Test 020
#
# Test partial blocksize defrag integrity issue.
#
# Calling EXT4_IOC_MOVE_EXTENT on file not aligned with block size and block
# size is smaller than page size would cause integrity issue on the
# partial-blocksize part when copying data between orign file and donor file.
#
#-----------------------------------------------------------------------
# Copyright (c) 2016 Red Hat Inc. 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"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

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

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here
_supported_fs ext4
_supported_os Linux
_require_scratch
_require_defrag

e4compact=$here/src/e4compact
_require_test_program "e4compact"

testfile=$SCRATCH_MNT/$seq.orig
donorfile=$SCRATCH_MNT/$seq.donor
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

# reserve space for donor file, written by 0xaa and sync to disk to avoid
# EBUSY on EXT4_IOC_MOVE_EXT
$XFS_IO_PROG -fc "pwrite -S 0xaa 0 1m" -c "fsync" $donorfile | _filter_xfs_io

# create test file with 1023 in size, written by 0xbb
# 1023 is smaller than 1k and works for any block size filesystems
$XFS_IO_PROG -fc "pwrite -S 0xbb 0 1023" -c "fsync" $testfile | _filter_xfs_io

# compute initial md5sum
md5sum $testfile > $tmp.md5sum

# drop cache, force e4compact to read data from disk
echo 3 > /proc/sys/vm/drop_caches

# test defrag
echo "$testfile" | $e4compact -i -v -f $donorfile >>$seqres.full

# check md5sum
md5sum -c $tmp.md5sum | _filter_scratch

# success, all done
status=0
exit