#! /bin/bash
# FSQA Test No. 412
#
# Test that if we have a file with a hole, do a mix of direct IO and buffered
# writes to it and truncate the file to a size that lies in the middle of the
# hole, after unmounting and mounting again the filesystem, the file has a
# correct size and no data loss happened.
#
#-----------------------------------------------------------------------
#
# Copyright (C) 2017 SUSE Linux Products GmbH. All Rights Reserved.
# Author: Filipe Manana <fdmanana@suse.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"
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	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_odirect

rm -f $seqres.full

_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

# Create out test file with two extents and a hole between those extents.
# The extent that lies beyond the hole must be written using direct IO and later
# we truncate the file to a size that lies within the hole's range.
$XFS_IO_PROG -f -c "pwrite -S 0x01 0K 32K" $SCRATCH_MNT/foo | _filter_xfs_io
$XFS_IO_PROG -d -c "pwrite -S 0x02 -b 32K 64K 32K" $SCRATCH_MNT/foo \
	| _filter_xfs_io

# Now truncate our file to a smaller size that lies behind the offset used by
# the previous direct IO write and that lies in a file hole.
$XFS_IO_PROG -c "truncate 60K" $SCRATCH_MNT/foo

# Now get file digests before unmounting the filesystem and after mounting it
# again. The digests should match (same file data and size in both cases).
echo "File digest before unmounting the filesystem:"
md5sum $SCRATCH_MNT/foo | _filter_scratch
_scratch_cycle_mount
echo "File digest after mounting again the filesystem:"
md5sum $SCRATCH_MNT/foo | _filter_scratch

status=0
exit