tests/generic/474

#! /bin/bash
# FS QA Test 474
#
# Inspired by syncfs bug of overlayfs which does not sync dirty inodes in
# underlying filesystem.
#
# Create a small file then run syncfs and shutdown filesystem(or underlying
# filesystem of overlayfs) to check syncfs result.
#
# Test will be skipped if filesystem(or underlying filesystem of overlayfs)
# does not support shutdown.
#
#-----------------------------------------------------------------------
# Copyright (c) 2017 Chengguang Xu <cgxu519@icloud.com>
# 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=0
trap "_cleanup; exit \$status" 0 1 2 3 15

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

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

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

# real QA test starts here

_supported_fs generic
_supported_os Linux
_require_fssum
_require_scratch
_require_scratch_shutdown
_require_xfs_io_command "syncfs"

_scratch_mkfs >/dev/null 2>&1
_scratch_mount

# Background writeback will flush dirty inode by dirty ratio and dirty time
# period(default 30 seconds), in order to avoid interference from it,
# run sync before test to make all dirty inodes clean, and it also
# accelerates syncfs on testing filesystem so that test case can finish
# in 30 seconds.

sync

$XFS_IO_PROG -f -c "pwrite 0 4K" $SCRATCH_MNT/testfile >/dev/null 2>&1

# fssum used for comparing checksum of test file(data & metedata),
# exclude checking about atime, block structure, open error.
$FSSUM_PROG -ugomAcdES -f -w $tmp.fssum $SCRATCH_MNT
$XFS_IO_PROG -c "syncfs" $SCRATCH_MNT/testfile >/dev/null 2>&1
_scratch_shutdown
_scratch_cycle_mount
$FSSUM_PROG -r $tmp.fssum $SCRATCH_MNT

exit