#! /bin/bash
# FS QA Test No. 092
#
# fallocate/truncate tests with FALLOC_FL_KEEP_SIZE option.
# Verify if the disk space is released after truncating a file to i_size after
# writing to a portion of a preallocated range.
#
# This also verifies that truncat'ing up past i_size doesn't remove the
# preallocated space.
#
#-----------------------------------------------------------------------
# Copyright (c) 2015 Facebook.  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`
tmp=/tmp/$$
status=0	# success 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
. ./common/punch

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_supported_os Linux
_require_test
_require_xfs_io_command "falloc"
_require_fiemap

# First test to make sure that truncating at i_size trims the preallocated bit
# past i_size
$XFS_IO_PROG -f -c "falloc -k 0 10M" -c "pwrite 0 5M" -c "truncate 5M"\
	$TEST_DIR/testfile.$seq | _filter_xfs_io
sync
$XFS_IO_PROG -c "fiemap -v" $TEST_DIR/testfile.$seq | _filter_fiemap

# Now verify that if we truncate up past i_size we don't trim the preallocated
# bit
$XFS_IO_PROG -c "falloc -k 5M 5M" -c "truncate 7M" $TEST_DIR/testfile.$seq
$XFS_IO_PROG -c "fiemap -v" $TEST_DIR/testfile.$seq | _filter_fiemap

# success, all done
exit