README: fill out some useful quickstart information

[qemu.git] / tests / qemu-iotests / 015

#!/bin/bash
#
# Combined test to grow the refcount table and test snapshots.
#
# Copyright (C) 2009 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
[email protected]

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

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

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

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

# actually any format that supports snapshots
_supported_fmt qcow2
_supported_proto generic
_supported_os Linux
# Internal snapshots are (currently) impossible with refcount_bits=1
_unsupported_imgopts 'refcount_bits=1[^0-9]'

echo
echo "creating image"

# With 1k clusters a refcount block contains 512 clusters
# This makes 512k of the image file covered by a refcount block
# A refcount table that spans one clusters has 128 refcount
# tables which makes up 64M in the image file.
#
# We use a 36M image, so initially we can be sure that only one cluster is used
# for the refcount table. On the other hand this is big enough to cause a
# refcount table growth when rewriting the image after creating one snapshot.
size=36M
CLUSTER_SIZE=1k
_make_test_img $size

# Create two snapshots which fill the image with two different patterns
echo "creating first snapshot"
$QEMU_IO -c "aio_write -P 123 0 $size" "$TEST_IMG" | _filter_qemu_io
$QEMU_IMG snapshot -c snap1 "$TEST_IMG"
echo "creating second snapshot"
$QEMU_IO -c "aio_write -P 165 0 $size" "$TEST_IMG" | _filter_qemu_io
$QEMU_IMG snapshot -c snap2 "$TEST_IMG"

# Now check the pattern
echo "checking first snapshot"
$QEMU_IMG snapshot -a snap1 "$TEST_IMG"
$QEMU_IO -c "aio_read -P 123 0 $size" "$TEST_IMG" | _filter_qemu_io
echo "checking second snapshot"
$QEMU_IMG snapshot -a snap2 "$TEST_IMG"
$QEMU_IO -c "aio_read -P 165 0 $size" "$TEST_IMG" | _filter_qemu_io

echo
echo "checking image for errors"
_check_test_img

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