apfstests/tests/ext4/015

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Oracle, Inc.  All Rights Reserved.
#
# FS QA Test No. 015
#
# Create and populate an ext4 filesystem, corrupt an extent tree block, then
# see how the kernel and e2fsck deal with it.
#
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

_require_xfs_io_command "falloc"
_require_xfs_io_command "fpunch"
_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 > /dev/null 2>&1

echo "+ mount fs image"
_scratch_mount
blksz="$(stat -f -c '%s' "${SCRATCH_MNT}")"
freeblks="$((3 * blksz / 12))"

echo "+ make some files"
$XFS_IO_PROG -f -c "falloc 0 $((blksz * freeblks))" "${SCRATCH_MNT}/bigfile" >> $seqres.full
seq 1 2 ${freeblks} | while read lblk; do
	$XFS_IO_PROG -f -c "fpunch $((lblk * blksz)) ${blksz}" "${SCRATCH_MNT}/bigfile" >> $seqres.full
done
umount "${SCRATCH_MNT}"

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

echo "+ corrupt image"
debugfs "${SCRATCH_DEV}" -R 'ex /bigfile' 2> /dev/null | grep '^ 0' | awk '{print $8}' | while read blk; do
	$XFS_IO_PROG -f -c "pwrite -S 0x62 $((blk * blksz + 8)) 8" "${SCRATCH_DEV}" >> $seqres.full
done

echo "+ mount image"
_scratch_mount

echo "+ modify files"
echo moo >> "${SCRATCH_MNT}/bigfile" 2> /dev/null && _fail "extent tree should be corrupt"
umount "${SCRATCH_MNT}"

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

echo "+ mount image (2)"
_scratch_mount

echo "+ modify files (2)"
$XFS_IO_PROG -f -c "pwrite ${blksz} ${blksz}" "${SCRATCH_MNT}/bigfile" >> $seqres.full
umount "${SCRATCH_MNT}"

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

status=0
exit