mirror of https://gitee.com/openkylin/qemu.git
iotests: Add test for backing file overrides
Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20190201192935.18394-9-mreitz@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
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Max Reitz
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#!/usr/bin/env python
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#
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# Test for when a backing file is considered overridden (thus, a
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# json:{} filename is generated for the overlay) and when it is not
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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, filter_testfiles, filter_imgfmt, \
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filter_qmp_testfiles, filter_qmp_imgfmt
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# Need backing file and change-backing-file support
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iotests.verify_image_format(supported_fmts=['qcow2', 'qed'])
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iotests.verify_platform(['linux'])
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def log_node_info(node):
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log('')
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log('bs->filename: ' + node['image']['filename'],
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filters=[filter_testfiles, filter_imgfmt])
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log('bs->backing_file: ' + node['backing_file'],
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filters=[filter_testfiles, filter_imgfmt])
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if 'backing-image' in node['image']:
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log('bs->backing->bs->filename: ' +
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node['image']['backing-image']['filename'],
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filters=[filter_testfiles, filter_imgfmt])
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else:
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log('bs->backing: (none)')
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log('')
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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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assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0
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# Choose a funny way to describe the backing filename
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assert qemu_img('create', '-f', iotests.imgfmt, '-b',
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'file:' + base_img_path, top_img_path) == 0
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vm.launch()
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log('--- Implicit backing file ---')
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log('')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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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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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Filename should be plain, and the backing filename should not
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# contain the "file:" prefix
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log_node_info(vm.node_info('node0'))
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vm.qmp_log('blockdev-del', node_name='node0')
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log('')
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log('--- change-backing-file ---')
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log('')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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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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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Changing the backing file to a qemu-reported filename should
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# result in qemu accepting the corresponding BDS as the implicit
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# backing BDS (and thus not generate a json:{} filename).
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# So, first, query the backing filename.
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backing_filename = \
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vm.node_info('node0')['image']['backing-image']['filename']
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# Next, change the backing file to something different
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vm.qmp_log('change-backing-file',
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image_node_name='node0',
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device='node0',
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backing_file='null-co://',
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filters=[filter_qmp_testfiles])
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# Now, verify that we get a json:{} filename
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# (Image header says "null-co://", actual backing file still is
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# base_img_path)
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log_node_info(vm.node_info('node0'))
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# Change it back
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# (To get header and backing file in sync)
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vm.qmp_log('change-backing-file',
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image_node_name='node0',
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device='node0',
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backing_file=backing_filename,
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filters=[filter_qmp_testfiles])
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# And verify that we get our original results
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log_node_info(vm.node_info('node0'))
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# Finally, try a "file:" prefix. While this is actually what we
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# originally had in the image header, qemu will not reopen the
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# backing file here, so it cannot verify that this filename
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# "resolves" to the actual backing BDS's filename and will thus
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# consider both to be different.
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# (This may be fixed in the future.)
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vm.qmp_log('change-backing-file',
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image_node_name='node0',
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device='node0',
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backing_file=('file:' + backing_filename),
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filters=[filter_qmp_testfiles])
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# So now we should get a json:{} filename
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log_node_info(vm.node_info('node0'))
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# Remove and re-attach so we can see that (as in our first try),
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# opening the image anew helps qemu resolve the header backing
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# filename.
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vm.qmp_log('blockdev-del', node_name='node0')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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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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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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log_node_info(vm.node_info('node0'))
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vm.qmp_log('blockdev-del', node_name='node0')
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log('')
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log('--- Override backing file ---')
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log('')
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# For this test, we need the plain filename in the image header
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# (because qemu cannot "canonicalize"/"resolve" the backing
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# filename unless the backing file is opened implicitly with the
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# overlay)
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assert qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path,
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top_img_path) == 0
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# You can only reliably override backing options by using a node
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# reference (or by specifying file.filename, but, well...)
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vm.qmp_log('blockdev-add', node_name='null', driver='null-co')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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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='null',
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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Should get a json:{} filename (and bs->backing_file is
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# null-co://, because that field actually has not much to do
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# with the header backing filename (except that it is changed by
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# change-backing-file))
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log_node_info(vm.node_info('node0'))
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# Detach the backing file by reopening the whole thing
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vm.qmp_log('blockdev-del', node_name='node0')
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vm.qmp_log('blockdev-del', node_name='null')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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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=None,
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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Should get a json:{} filename (because we overrode the backing
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# file to not be there)
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log_node_info(vm.node_info('node0'))
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# Open the original backing file
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vm.qmp_log('blockdev-add',
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node_name='original-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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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Attach the original backing file to its overlay
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vm.qmp_log('blockdev-snapshot',
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node='original-backing',
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overlay='node0')
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# This should give us the original plain result
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# FIXME: Currently, the block layer considers the runtime backing
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# file to be different from the image header, which is
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# wrong. This is fixed by a future patch.
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log_node_info(vm.node_info('node0'))
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vm.qmp_log('blockdev-del', node_name='node0')
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vm.qmp_log('blockdev-del', node_name='original-backing')
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vm.shutdown()
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@ -0,0 +1,84 @@
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--- Implicit backing file ---
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{"execute": "blockdev-add", "arguments": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}, "node-name": "node0"}}
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{"return": {}}
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bs->filename: TEST_DIR/PID-top.img
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bs->backing_file: TEST_DIR/PID-base.img
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bs->backing->bs->filename: TEST_DIR/PID-base.img
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{"execute": "blockdev-del", "arguments": {"node-name": "node0"}}
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{"return": {}}
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--- change-backing-file ---
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{"execute": "blockdev-add", "arguments": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}, "node-name": "node0"}}
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{"return": {}}
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{"execute": "change-backing-file", "arguments": {"backing-file": "null-co://", "device": "node0", "image-node-name": "node0"}}
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{"return": {}}
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bs->filename: json:{"backing": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
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bs->backing_file: null-co://
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bs->backing->bs->filename: TEST_DIR/PID-base.img
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{"execute": "change-backing-file", "arguments": {"backing-file": "TEST_DIR/PID-base.img", "device": "node0", "image-node-name": "node0"}}
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{"return": {}}
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bs->filename: TEST_DIR/PID-top.img
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bs->backing_file: TEST_DIR/PID-base.img
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bs->backing->bs->filename: TEST_DIR/PID-base.img
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{"execute": "change-backing-file", "arguments": {"backing-file": "file:TEST_DIR/PID-base.img", "device": "node0", "image-node-name": "node0"}}
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{"return": {}}
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bs->filename: json:{"backing": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
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bs->backing_file: file:TEST_DIR/PID-base.img
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bs->backing->bs->filename: TEST_DIR/PID-base.img
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{"execute": "blockdev-del", "arguments": {"node-name": "node0"}}
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{"return": {}}
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{"execute": "blockdev-add", "arguments": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}, "node-name": "node0"}}
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{"return": {}}
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bs->filename: TEST_DIR/PID-top.img
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bs->backing_file: TEST_DIR/PID-base.img
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bs->backing->bs->filename: TEST_DIR/PID-base.img
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{"execute": "blockdev-del", "arguments": {"node-name": "node0"}}
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{"return": {}}
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--- Override backing file ---
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{"execute": "blockdev-add", "arguments": {"driver": "null-co", "node-name": "null"}}
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{"return": {}}
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{"execute": "blockdev-add", "arguments": {"backing": "null", "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}, "node-name": "node0"}}
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{"return": {}}
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bs->filename: json:{"backing": {"driver": "null-co"}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
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bs->backing_file: null-co://
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bs->backing->bs->filename: null-co://
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{"execute": "blockdev-del", "arguments": {"node-name": "node0"}}
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{"return": {}}
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{"execute": "blockdev-del", "arguments": {"node-name": "null"}}
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{"return": {}}
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{"execute": "blockdev-add", "arguments": {"backing": null, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}, "node-name": "node0"}}
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{"return": {}}
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bs->filename: json:{"backing": null, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
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bs->backing_file: TEST_DIR/PID-base.img
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bs->backing: (none)
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{"execute": "blockdev-add", "arguments": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}, "node-name": "original-backing"}}
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{"return": {}}
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{"execute": "blockdev-snapshot", "arguments": {"node": "original-backing", "overlay": "node0"}}
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{"return": {}}
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bs->filename: json:{"backing": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
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bs->backing_file: TEST_DIR/PID-base.img
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bs->backing->bs->filename: TEST_DIR/PID-base.img
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{"execute": "blockdev-del", "arguments": {"node-name": "node0"}}
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{"return": {}}
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{"execute": "blockdev-del", "arguments": {"node-name": "original-backing"}}
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{"return": {}}
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@ -227,6 +227,7 @@
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225 rw auto quick
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226 auto quick
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227 auto quick
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228 rw auto quick
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229 auto quick
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231 auto quick
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232 auto quick
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