qemu/tests/qemu-iotests/066

#!/bin/bash
#
# Test case for discarding preallocated zero clusters in qcow2
#
# Copyright (C) 2013 Red Hat, Inc.
#
# 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=mreitz@redhat.com

seq="$(basename $0)"
echo "QA output created by $seq"

here="$PWD"
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

# This tests qocw2-specific low-level functionality
_supported_fmt qcow2
_supported_proto generic
_supported_os Linux

# Intentionally create an unaligned image
IMGOPTS="compat=1.1"
IMG_SIZE=$((64 * 1024 * 1024 + 512))

echo
echo "=== Testing cluster discards ==="
echo
_make_test_img $IMG_SIZE
# Write some normal clusters, zero some of them (creating preallocated
# zero clusters) and discard everything. Everything should now read as 0.
$QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \
	 -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \
         | _filter_qemu_io
# Check the image (there shouldn't be any leaks)
_check_test_img

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