#!/bin/bash
#
# Test that sub-cluster allocating writes zero the rest of the cluster
#
# Copyright (C) 2010 IBM, Corp.
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>.
#

# creator
owner=stefanha@linux.vnet.ibm.com

seq=`basename $0`
echo "QA output created by $seq"

status=1	# failure is the default!

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

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

_supported_fmt vmdk qcow qcow2 qed
_supported_proto generic
_supported_os Linux


size=128M
cluster_size=65536
subcluster_offset=1024
subcluster_size=2048
_make_test_img $size

# This first write causes an L2 table to be allocated so that the next write
# doesn't need to allocate one and is therefore at the end of the image file.
# Otherwise an L2 table could get in the way after the data cluster.
echo
echo "== writing first cluster to populate metadata =="
$QEMU_IO -c "write -pP 0xde $cluster_size $cluster_size" "$TEST_IMG" | _filter_qemu_io

echo
echo "== writing at sub-cluster granularity =="
$QEMU_IO -c "write -pP 0xa $subcluster_offset $subcluster_size" "$TEST_IMG" | _filter_qemu_io

echo
echo "== verify pattern =="
$QEMU_IO -c "read -pP 0xa $subcluster_offset $subcluster_size" "$TEST_IMG" | _filter_qemu_io

echo
echo "== verify zeroes before sub-cluster pattern =="
$QEMU_IO -c "read -pP 0 -l $subcluster_offset 0 $subcluster_size" "$TEST_IMG" | _filter_qemu_io

echo
echo "== verify zeroes after sub-cluster pattern =="
$QEMU_IO -c "read -pP 0 -l 512 -s $subcluster_size $subcluster_offset $(( subcluster_size + 512 ))" "$TEST_IMG" | _filter_qemu_io

# success, all done
echo "*** done"
rm -f $seq.full
status=0