tests/generic/491

#! /bin/bash
# FS QA Test No. 491
#
# Test first read with freeze right after mount.
#
# With ext4, this leads to freeze proection bypass WARN_ON in
# ext4_journal_check_start.
#
#-----------------------------------------------------------------------
# Copyright (C) 2018 CTERA Networks. All Rights Reserved.
# Author: Amir Goldstein <amir73il@gmail.com>
#
# 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

# real QA test starts here
_supported_fs generic
_supported_os Linux
_require_scratch
_require_freeze
_require_command "$TIMEOUT_PROG" "timeout"

rm -f $seqres.full

testfile=$SCRATCH_MNT/foo

# Create a filesystem with a file
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
echo "frozen" > $testfile

# Mount filesystem "noatime" and freeze right after mount -
# reads should not block
_scratch_cycle_mount "noatime"
xfs_freeze -f $SCRATCH_MNT

# Read file while filesystem is frozen should succeed
# without blocking
$TIMEOUT_PROG -s KILL 1s cat $testfile

xfs_freeze -u $SCRATCH_MNT

status=0
exit