#! /bin/bash
# FS QA Test No. 311
#
# Run various fsync tests with dm flakey in freeze() mode and non freeze()
# mode. The idea is that we do random writes and randomly fsync and verify that
# after a fsync() followed by a freeze()+failure or just failure that the file
# is correct.  We remount the file system after the failure so that the file
# system can do whatever cleanup it needs to and md5sum the file to make sure
# it matches hat it was before the failure.  We also fsck to make sure the file
# system is consistent.
#
# The fsync tester just random writes into prealloc or not, and then fsync()s
# randomly or sync()'s randomly and then fsync()'s before exit.  There are a few
# tests that were handcrafted to reproduce bugs in btrfs, so it's also a
# regression test of sorts.
#
#-----------------------------------------------------------------------
# Copyright (c) 2013 Fusion IO. 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`
status=1	# failure is the default!

_cleanup()
{
	_cleanup_flakey
}
trap "_cleanup; exit \$status" 0 1 2 3 15

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

# real QA test starts here
_supported_fs generic
_supported_os Linux
_require_scratch_nocheck
_require_odirect
_require_dm_target flakey
_require_metadata_journaling $SCRATCH_DEV

# xfs_io is not required for this test, but it's the best way to verify
# the test system supports fallocate() for allocation
_require_xfs_io_command "falloc"

_require_test_program "fsync-tester"

rm -f $seqres.full
SEED=1
testfile=$SCRATCH_MNT/$seq.fsync

_run_test()
{
	# _run_test <testnum> <0 - buffered | 1 - O_DIRECT>
	test_num=$1

	direct_opt=""
	[ $2 -eq 1 ] && direct_opt="-d"

	$here/src/fsync-tester -s $SEED -t $test_num $direct_opt $testfile
	[ $? -ne 0 ] && _fatal "fsync tester exited abnormally"

	_md5_checksum $testfile
	_load_flakey_table $FLAKEY_DROP_WRITES $lockfs
	_unmount_flakey

	#Ok mount so that any recovery that needs to happen is done
	_load_flakey_table $FLAKEY_ALLOW_WRITES
	_mount_flakey
	_md5_checksum $testfile

	#Unmount and fsck to make sure we got a valid fs after replay
	_unmount_flakey
	_check_scratch_fs $FLAKEY_DEV
	[ $? -ne 0 ] && _fatal "fsck failed"

	_mount_flakey
}

_scratch_mkfs >> $seqres.full 2>&1

# Create a basic flakey device that will never error out
_init_flakey
_mount_flakey

buffered=0
direct=1

for i in $(seq 1 20); do
	lockfs=1
	SEED=$i
	echo "Running test $i buffered, normal suspend"
	_run_test $i $buffered
	echo "Running test $i direct, normal suspend"
	_run_test $i $direct

	lockfs=0
	echo "Running test $i buffered, nolockfs"
	_run_test $i $buffered
	echo "Running test $i direct, nolockfs"
	_run_test $i $direct
done

status=0
exit