116 lines
4.2 KiB
Plaintext
116 lines
4.2 KiB
Plaintext
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#!/usr/bin/env python
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#
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# Copy-on-read tests using a COR filter node
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#
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# Copyright (C) 2018 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Creator/Owner: Max Reitz <mreitz@redhat.com>
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import iotests
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from iotests import log, qemu_img_pipe, qemu_io, filter_qemu_io
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# Need backing file support
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iotests.verify_image_format(supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk'])
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iotests.verify_platform(['linux'])
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log('')
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log('=== Copy-on-read across nodes ===')
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log('')
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# The old copy-on-read mechanism without a filter node cannot request
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# WRITE_UNCHANGED permissions for its child. Therefore it just tries
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# to sneak its write by the usual permission system and holds its
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# fingers crossed. However, that sneaking does not work so well when
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# there is a filter node in the way: That will receive the write
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# request and re-issue a new one to its child, which this time is a
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# proper write request that will make the permission system cough --
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# unless there is someone at the top (like a guest device) that has
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# requested write permissions.
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#
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# A COR filter node, however, can request the proper permissions for
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# its child and therefore is not hit by this issue.
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with iotests.FilePath('base.img') as base_img_path, \
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iotests.FilePath('top.img') as top_img_path, \
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iotests.VM() as vm:
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log('--- Setting up images ---')
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log('')
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qemu_img_pipe('create', '-f', iotests.imgfmt, base_img_path, '64M')
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log(filter_qemu_io(qemu_io(base_img_path, '-c', 'write -P 1 0M 1M')))
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qemu_img_pipe('create', '-f', iotests.imgfmt, '-b', base_img_path,
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top_img_path)
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log(filter_qemu_io(qemu_io(top_img_path, '-c', 'write -P 2 1M 1M')))
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log('')
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log('--- Doing COR ---')
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log('')
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# Compare with e.g. the following:
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# vm.add_drive_raw('if=none,node-name=node0,copy-on-read=on,driver=raw,' \
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# 'file.driver=%s,file.file.filename=%s' %
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# (iotests.imgfmt, top_img_path))
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# (Remove the blockdev-add instead.)
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# ((Not tested here because it hits an assertion in the permission
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# system.))
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vm.launch()
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log(vm.qmp('blockdev-add',
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node_name='node0',
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driver='copy-on-read',
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file={
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'driver': 'raw',
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'file': {
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'driver': 'copy-on-read',
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'file': {
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'driver': 'raw',
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'file': {
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'driver': iotests.imgfmt,
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'file': {
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'driver': 'file',
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'filename': top_img_path
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},
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'backing': {
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'driver': iotests.imgfmt,
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'file': {
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'driver': 'file',
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'filename': base_img_path
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}
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}
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}
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}
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}
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}))
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# Trigger COR
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log(vm.qmp('human-monitor-command',
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command_line='qemu-io node0 "read 0 64M"'))
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vm.shutdown()
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log('')
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log('--- Checking COR result ---')
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log('')
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log(filter_qemu_io(qemu_io(base_img_path, '-c', 'discard 0 64M')))
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log(filter_qemu_io(qemu_io(top_img_path, '-c', 'read -P 1 0M 1M')))
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log(filter_qemu_io(qemu_io(top_img_path, '-c', 'read -P 2 1M 1M')))
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