Archipelago » qemu

#!/bin/bash

#

# Test that backing files can be smaller than the image

#

# Copyright (C) 2010 IBM, Corp.

#

# Based on 017:

# 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

owner=stefanha@linux.vnet.ibm.com

seq=`basename $0`

echo "QA output created by $seq"

here=`pwd`

tmp=/tmp/$$

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

. ./common.pattern

# Any format supporting backing files except vmdk and qcow which do not support

# smaller backing files.

_supported_fmt qcow2 qed

_supported_proto generic

_supported_os Linux

# Choose a size that is not necessarily a cluster size multiple for image

# formats that use clusters.  This will ensure that the base image doesn't end

# precisely on a cluster boundary (the easy case).

image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 ))

# The base image is smaller than the image file

base_size=$(( image_size - 1024 * 1024 * 1024 ))

offset=$(( base_size - 32 * 1024 ))

_make_test_img $base_size

echo "Filling base image"

echo

# Fill end of base image with a pattern, skipping every other sector

io writev $offset 512 1024 32

_check_test_img

echo "Creating test image with backing file"

echo

mv $TEST_IMG $TEST_IMG.base

_make_test_img -b $TEST_IMG.base $image_size

echo "Filling test image"

echo

# Write every other sector around where the base image ends

io writev $(( offset + 512 )) 512 1024 64

_check_test_img

echo "Reading"

echo

# Base image sectors

io readv $(( offset )) 512 1024 32

# Image sectors

io readv $(( offset + 512 )) 512 1024 64

# Zero sectors beyond end of base image

io_zero readv $(( offset + 32 * 1024 )) 512 1024 32

_check_test_img

# Rebase it on top of its base image

$QEMU_IMG rebase -b $TEST_IMG.base $TEST_IMG

_check_test_img

# success, all done

echo "*** done"

rm -f $seq.full

status=0