#! /bin/bash
# FSQA Test No. 483
#
# Test that fsync operations preserve extents allocated with fallocate(2) that
# are placed beyond a file's size.
#
#-----------------------------------------------------------------------
#
# Copyright (C) 2018 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()
{
	_cleanup_flakey
	cd /
	rm -f $tmp.*
}

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

# real QA test starts here
_supported_fs generic
_supported_os Linux
_require_scratch
_require_dm_target flakey
_require_xfs_io_command "falloc" "-k"
_require_xfs_io_command "fiemap"

rm -f $seqres.full

_scratch_mkfs >>$seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey

# Create our test files.
$XFS_IO_PROG -f -c "pwrite -S 0xea 0 256K" $SCRATCH_MNT/foo >/dev/null

# Create a file with many extents. We later want to shrink truncate it and
# add a prealloc extent beyond its new size.
for ((i = 1; i <= 500; i++)); do
	offset=$(((i - 1) * 4 * 1024))
	$XFS_IO_PROG -f -s -c "pwrite -S 0xcf $offset 4K" \
		$SCRATCH_MNT/bar >/dev/null
done

# A file which already has a prealloc extent beyond its size.
# The fsync done on it is motivated by differences in the btrfs implementation
# of fsync (first fsync has different logic from subsequent fsyncs).
$XFS_IO_PROG -f -c "pwrite -S 0xf1 0 256K" \
	     -c "falloc -k 256K 768K" \
	     -c "fsync" \
	     $SCRATCH_MNT/baz >/dev/null

# Make sure everything done so far is durably persisted.
sync

# Allocate an extent beyond the size of the first test file and fsync it.
$XFS_IO_PROG -c "falloc -k 256K 1M"\
	     -c "fsync" \
	     $SCRATCH_MNT/foo

# Do a shrinking truncate of our test file, add a prealloc extent to it after
# its new size and fsync it.
$XFS_IO_PROG -c "truncate 256K" \
	     -c "falloc -k 256K 1M"\
	     -c "fsync" \
	     $SCRATCH_MNT/bar

# Allocate another extent beyond the size of file baz.
$XFS_IO_PROG -c "falloc -k 1M 2M"\
	     -c "fsync" \
	     $SCRATCH_MNT/baz

# Simulate a power failure and mount the filesystem to check that the extents
# previously allocated were not lost and the file sizes are correct.
_flakey_drop_and_remount

echo "File foo fiemap:"
$XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/foo | _filter_hole_fiemap
echo "File foo size:"
stat --format %s $SCRATCH_MNT/foo

echo "File bar fiemap:"
$XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/bar | _filter_hole_fiemap
echo "File bar size:"
stat --format %s $SCRATCH_MNT/bar

echo "File baz fiemap:"
$XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/baz | _filter_hole_fiemap
echo "File baz size:"
stat --format %s $SCRATCH_MNT/baz

_unmount_flakey
_cleanup_flakey

status=0
exit