Archipelago » qemu

#!/bin/bash

#

# Rebasing COW images

#

# 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=kwolf@redhat.com

seq=`basename $0`

echo "QA output created by $seq"

here=`pwd`

tmp=/tmp/$$

status=1	# failure is the default!

_cleanup()

{

	_cleanup_test_img

	rm -f $TEST_DIR/t.$IMGFMT.base_old

	rm -f $TEST_DIR/t.$IMGFMT.base_new

}

trap "_cleanup; exit \$status" 0 1 2 3 15

# get standard environment, filters and checks

. ./common.rc

. ./common.filter

. ./common.pattern

# Currently only qcow2 supports rebasing

_supported_fmt qcow2

_supported_os Linux

CLUSTER_SIZE=65536

# Cluster allocations to be tested:

#

# Backing (old) 11  --  11  --  11  --  11  --

# Backing (new) 22  22  --  --  22  22  --  --

# COW image     33  33  33  33  --  --  --  --

echo "Creating backing file"

echo

_make_test_img 1G

io_pattern writev $((-2 * CLUSTER_SIZE)) $CLUSTER_SIZE $((2 * CLUSTER_SIZE)) 4 0x11

mv $TEST_IMG $TEST_IMG.base_old

echo "Creating new backing file"

echo

_make_test_img 1G

io_pattern writev $((-4 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 2 0x22

mv $TEST_IMG $TEST_IMG.base_new

echo "Creating COW image"

echo

_make_test_img -b $TEST_IMG.base_old 1G

io_pattern writev 0 $((4 * CLUSTER_SIZE)) 0 1 0x33

echo "Read before the rebase to make sure everything is set up correctly"

echo

io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33

io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33

io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33

io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33

io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11

io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00

io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11

io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00

echo

echo Rebase and test again

echo

$QEMU_IMG rebase -b $TEST_IMG.base_new $TEST_IMG

io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33

io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33

io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33

io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33

io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11

io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00

io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11

io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00

# success, all done

echo "*** done"

rm -f $seq.full

status=0