#! /bin/bash
# FS QA Test No. 071
#
# Test extent pre-allocation (using fallocate) into a region that already has a
# pre-allocated extent that ends beyond the file's size. Verify that if the fs
# is unmounted immediately after, the file's size and content are not lost.
#
#-----------------------------------------------------------------------
# Copyright (C) 2015 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"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!

_cleanup()
{
	rm -f $tmp.*
}
trap "_cleanup; exit \$status" 0 1 2 3 15

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

# real QA test starts here
_supported_fs generic
_supported_os Linux
_need_to_be_root
_require_scratch
_require_xfs_io_command "falloc"

rm -f $seqres.full

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

# Create our test file with a pre-allocated extent that doesn't increase the
# file's size.
$XFS_IO_PROG -f -c "falloc -k 0 1M" $SCRATCH_MNT/foo

# Write some data to our file.
$XFS_IO_PROG -c "pwrite -S 0xaa 0 256K" $SCRATCH_MNT/foo | _filter_xfs_io

# Now call fallocate again, but allowing it to increase the file's size and
# cover a range that is entirely covered by the extent that we previously
# pre-allocated.
$XFS_IO_PROG -c "falloc 0 512K" $SCRATCH_MNT/foo

# Now ummount and mount again the fs. After this we expect the file's size to
# be 512Kb.
_scratch_remount

# Now check that all data we wrote before are available and the file size is
# 512Kb.
echo "File content after remount:"
od -t x1 $SCRATCH_MNT/foo

status=0
exit