tests/ext4/011

#! /bin/bash
# FS QA Test No. 011
#
# Create and populate an ext4 filesystem, corrupt the MMP block, then
# see how the kernel and e2fsck deal with it.
#
#-----------------------------------------------------------------------
# Copyright (c) 2015 Oracle, 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/attr

# real QA test starts here
_supported_fs ext4
_supported_os Linux

_require_scratch
test -n "${FORCE_FUZZ}" || _require_scratch_ext4_crc
_require_attrs

rm -f $seqres.full
TESTDIR="${SCRATCH_MNT}/scratchdir"
TESTFILE="${TESTDIR}/testfile"

echo "+ create scratch fs"
_scratch_mkfs_ext4 -O mmp -E mmp_update_interval=2 > /dev/null 2>&1

echo "+ mount fs image"
_scratch_mount
blksz="$(stat -f -c '%s' "${SCRATCH_MNT}")"

echo "+ make some files"
echo moo > "${SCRATCH_MNT}/file0"
umount "${SCRATCH_MNT}"

echo "+ check fs"
e2fsck -fn "${SCRATCH_DEV}" >> $seqres.full 2>&1 || _fail "fsck should not fail"

echo "+ corrupt image"
blk="$(dumpe2fs "${SCRATCH_DEV}" 2> /dev/null | grep 'MMP block number' | sed -e 's/^MMP block number: *\([0-9]*\)$/\1/g')"
$XFS_IO_PROG -f -c "pwrite -S 0x62 $((blk * blksz + 16)) 8" "${SCRATCH_DEV}" >> $seqres.full

echo "+ mount image"
_try_scratch_mount 2> /dev/null && _fail "mount should fail due to bad MMP"

echo "+ repair fs"
e2fsck -fy "${SCRATCH_DEV}" >> $seqres.full 2>&1

echo "+ mount image (2)"
_try_scratch_mount || _fail "mount should not fail; MMP has been fixed"

echo "+ check fs (2)"
e2fsck -fn "${SCRATCH_DEV}" >> $seqres.full 2>&1 || _fail "fsck should not fail"

status=0
exit