tests/ext4/019

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Oracle, Inc.  All Rights Reserved.
#
# FS QA Test No. 019
#
# Create and populate an ext4 filesystem, corrupt a big symlink, then
# see how the kernel and e2fsck deal with it.  (They won't)
#
. ./common/preamble
_begin_fstest fuzzers

# Override the default cleanup function.
_cleanup()
{
    cd /
    #rm -f $tmp.*
}

# Import common functions.
. ./common/filter
. ./common/attr

# real QA test starts here
_supported_fs ext4

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

TESTDIR="${SCRATCH_MNT}/scratchdir"
TESTFILE="${TESTDIR}/testfile"

echo "+ create scratch fs"
_scratch_mkfs_ext4 -O journal > /dev/null 2>&1

echo "+ mount fs image"
_scratch_mount
blksz="$(stat -f -c '%s' "${SCRATCH_MNT}")"
test "${blksz}" -gt 4096 && blksz=4096

echo "+ make some files"
echo "file contents: moo" > "${SCRATCH_MNT}/x"
str="$(perl -e "print './' x $(( (blksz / 2) - 16));")x"
(cd $SCRATCH_MNT; ln -s "${str}" "long_symlink")
cat "${SCRATCH_MNT}/long_symlink"
umount "${SCRATCH_MNT}"

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

echo "+ corrupt image"
debugfs -w -R 'zap -f /long_symlink -p 0x62 0' "${SCRATCH_DEV}" 2> /dev/null

echo "+ mount image"
_scratch_mount 2> /dev/null
cat "${SCRATCH_MNT}/long_symlink" 2>/dev/null && _fail "symlink should be broken"
umount "${SCRATCH_MNT}"

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

echo "+ mount image (2)"
_scratch_mount
cat "${SCRATCH_MNT}/long_symlink" 2>/dev/null && _fail "symlink should be broken"
umount "${SCRATCH_MNT}"

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

status=0
exit