xref: /qemu/tests/qemu-iotests/155 (revision a81df1b6) 
1#!/usr/bin/env python3
2#
3# Test whether the backing BDSs are correct after completion of a
4# mirror block job; in "existing" modes (drive-mirror with
5# mode=existing and blockdev-mirror) the backing chain should not be
6# overridden.
7#
8# Copyright (C) 2016 Red Hat, Inc.
9#
10# This program is free software; you can redistribute it and/or modify
11# it under the terms of the GNU General Public License as published by
12# the Free Software Foundation; either version 2 of the License, or
13# (at your option) any later version.
14#
15# This program is distributed in the hope that it will be useful,
16# but WITHOUT ANY WARRANTY; without even the implied warranty of
17# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18# GNU General Public License for more details.
19#
20# You should have received a copy of the GNU General Public License
21# along with this program.  If not, see <http://www.gnu.org/licenses/>.
22#
23
24import os
25import iotests
26from iotests import qemu_img
27
28back0_img = os.path.join(iotests.test_dir, 'back0.' + iotests.imgfmt)
29back1_img = os.path.join(iotests.test_dir, 'back1.' + iotests.imgfmt)
30back2_img = os.path.join(iotests.test_dir, 'back2.' + iotests.imgfmt)
31source_img = os.path.join(iotests.test_dir, 'source.' + iotests.imgfmt)
32target_img = os.path.join(iotests.test_dir, 'target.' + iotests.imgfmt)
33
34
35# Class variables for controlling its behavior:
36#
37# existing: If True, explicitly create the target image and blockdev-add it
38# target_backing: If existing is True: Use this filename as the backing file
39#                 of the target image
40#                 (None: no backing file)
41# target_blockdev_backing: If existing is True: Pass this dict as "backing"
42#                          for the blockdev-add command
43#                          (None: do not pass "backing")
44# target_real_backing: If existing is True: The real filename of the backing
45#                      image during runtime, only makes sense if
46#                      target_blockdev_backing is not None
47#                      (None: same as target_backing)
48# target_open_with_backing: If True, the target image is added with its backing
49#                           chain opened right away. If False, blockdev-add
50#                           opens it without a backing file and job completion
51#                           is supposed to open the backing chain.
52# use_iothread: If True, an iothread is configured for the virtio-blk device
53#               that uses the image being mirrored
54
55class BaseClass(iotests.QMPTestCase):
56    target_blockdev_backing = None
57    target_real_backing = None
58    target_open_with_backing = True
59    use_iothread = False
60
61    def setUp(self):
62        qemu_img('create', '-f', iotests.imgfmt, back0_img, '1440K')
63        qemu_img('create', '-f', iotests.imgfmt, '-b', back0_img,
64                 '-F', iotests.imgfmt, back1_img)
65        qemu_img('create', '-f', iotests.imgfmt, '-b', back1_img,
66                 '-F', iotests.imgfmt, back2_img)
67        qemu_img('create', '-f', iotests.imgfmt, '-b', back2_img,
68                 '-F', iotests.imgfmt, source_img)
69
70        self.vm = iotests.VM()
71        # Add the BDS via blockdev-add so it stays around after the mirror block
72        # job has been completed
73        blockdev = {'node-name': 'source',
74                    'driver': iotests.imgfmt,
75                    'file': {'driver': 'file',
76                             'filename': source_img}}
77        self.vm.add_blockdev(self.vm.qmp_to_opts(blockdev))
78
79        if self.use_iothread:
80            self.vm.add_object('iothread,id=iothread0')
81            iothread = ",iothread=iothread0"
82        else:
83            iothread = ""
84
85        self.vm.add_device('virtio-scsi%s' % iothread)
86        self.vm.add_device('scsi-hd,id=qdev0,drive=source')
87
88        self.vm.launch()
89
90        self.assertIntactSourceBackingChain()
91
92        if self.existing:
93            if self.target_backing:
94                qemu_img('create', '-f', iotests.imgfmt,
95                         '-b', self.target_backing, '-F', 'raw',
96                         target_img, '1440K')
97            else:
98                qemu_img('create', '-f', iotests.imgfmt, target_img, '1440K')
99
100            if self.cmd == 'blockdev-mirror':
101                options = { 'node-name': 'target',
102                            'driver': iotests.imgfmt,
103                            'file': { 'driver': 'file',
104                                      'node-name': 'target-file',
105                                      'filename': target_img } }
106
107                if not self.target_open_with_backing:
108                        options['backing'] = None
109                elif self.target_blockdev_backing:
110                        options['backing'] = self.target_blockdev_backing
111
112                result = self.vm.qmp('blockdev-add', **options)
113                self.assert_qmp(result, 'return', {})
114
115    def tearDown(self):
116        self.vm.shutdown()
117        os.remove(source_img)
118        os.remove(back2_img)
119        os.remove(back1_img)
120        os.remove(back0_img)
121        try:
122            os.remove(target_img)
123        except OSError:
124            pass
125
126    def findBlockNode(self, node_name, qdev=None):
127        if qdev:
128            result = self.vm.qmp('query-block')
129            for device in result['return']:
130                if device['qdev'] == qdev:
131                    if node_name:
132                        self.assert_qmp(device, 'inserted/node-name', node_name)
133                    return device['inserted']
134        else:
135            result = self.vm.qmp('query-named-block-nodes')
136            for node in result['return']:
137                if node['node-name'] == node_name:
138                    return node
139
140        self.fail('Cannot find node %s/%s' % (qdev, node_name))
141
142    def assertIntactSourceBackingChain(self):
143        node = self.findBlockNode('source')
144
145        self.assert_qmp(node, 'image' + '/backing-image' * 0 + '/filename',
146                        source_img)
147        self.assert_qmp(node, 'image' + '/backing-image' * 1 + '/filename',
148                        back2_img)
149        self.assert_qmp(node, 'image' + '/backing-image' * 2 + '/filename',
150                        back1_img)
151        self.assert_qmp(node, 'image' + '/backing-image' * 3 + '/filename',
152                        back0_img)
153        self.assert_qmp_absent(node, 'image' + '/backing-image' * 4)
154
155    def assertCorrectBackingImage(self, node, default_image):
156        if self.existing:
157            if self.target_real_backing:
158                image = self.target_real_backing
159            else:
160                image = self.target_backing
161        else:
162            image = default_image
163
164        if image:
165            self.assert_qmp(node, 'image/backing-image/filename', image)
166        else:
167            self.assert_qmp_absent(node, 'image/backing-image')
168
169
170# Class variables for controlling its behavior:
171#
172# cmd: Mirroring command to execute, either drive-mirror or blockdev-mirror
173
174class MirrorBaseClass(BaseClass):
175    def openBacking(self):
176        pass
177
178    def runMirror(self, sync):
179        if self.cmd == 'blockdev-mirror':
180            result = self.vm.qmp(self.cmd, job_id='mirror-job', device='source',
181                                 sync=sync, target='target',
182                                 auto_finalize=False)
183        else:
184            if self.existing:
185                mode = 'existing'
186            else:
187                mode = 'absolute-paths'
188            result = self.vm.qmp(self.cmd, job_id='mirror-job', device='source',
189                                 sync=sync, target=target_img,
190                                 format=iotests.imgfmt, mode=mode,
191                                 node_name='target', auto_finalize=False)
192
193        self.assert_qmp(result, 'return', {})
194
195        self.vm.run_job('mirror-job', auto_finalize=False,
196                        pre_finalize=self.openBacking, auto_dismiss=True)
197
198    def testFull(self):
199        self.runMirror('full')
200
201        node = self.findBlockNode('target', 'qdev0')
202        self.assertCorrectBackingImage(node, None)
203        self.assertIntactSourceBackingChain()
204
205    def testTop(self):
206        self.runMirror('top')
207
208        node = self.findBlockNode('target', 'qdev0')
209        self.assertCorrectBackingImage(node, back2_img)
210        self.assertIntactSourceBackingChain()
211
212    def testNone(self):
213        self.runMirror('none')
214
215        node = self.findBlockNode('target', 'qdev0')
216        self.assertCorrectBackingImage(node, source_img)
217        self.assertIntactSourceBackingChain()
218
219
220class TestDriveMirrorAbsolutePaths(MirrorBaseClass):
221    cmd = 'drive-mirror'
222    existing = False
223
224class TestDriveMirrorExistingNoBacking(MirrorBaseClass):
225    cmd = 'drive-mirror'
226    existing = True
227    target_backing = None
228
229class TestDriveMirrorExistingBacking(MirrorBaseClass):
230    cmd = 'drive-mirror'
231    existing = True
232    target_backing = 'null-co://'
233
234class TestBlockdevMirrorNoBacking(MirrorBaseClass):
235    cmd = 'blockdev-mirror'
236    existing = True
237    target_backing = None
238
239class TestBlockdevMirrorBacking(MirrorBaseClass):
240    cmd = 'blockdev-mirror'
241    existing = True
242    target_backing = 'null-co://'
243
244class TestBlockdevMirrorForcedBacking(MirrorBaseClass):
245    cmd = 'blockdev-mirror'
246    existing = True
247    target_backing = None
248    target_blockdev_backing = { 'driver': 'null-co' }
249    target_real_backing = 'null-co://'
250
251# Attach the backing chain only during completion, with blockdev-reopen
252class TestBlockdevMirrorReopen(MirrorBaseClass):
253    cmd = 'blockdev-mirror'
254    existing = True
255    target_backing = 'null-co://'
256    target_open_with_backing = False
257
258    def openBacking(self):
259        if not self.target_open_with_backing:
260            result = self.vm.qmp('blockdev-add', node_name="backing",
261                                 driver="null-co")
262            self.assert_qmp(result, 'return', {})
263            result = self.vm.qmp('x-blockdev-reopen', node_name="target",
264                                 driver=iotests.imgfmt, file="target-file",
265                                 backing="backing")
266            self.assert_qmp(result, 'return', {})
267
268class TestBlockdevMirrorReopenIothread(TestBlockdevMirrorReopen):
269    use_iothread = True
270
271# Attach the backing chain only during completion, with blockdev-snapshot
272class TestBlockdevMirrorSnapshot(MirrorBaseClass):
273    cmd = 'blockdev-mirror'
274    existing = True
275    target_backing = 'null-co://'
276    target_open_with_backing = False
277
278    def openBacking(self):
279        if not self.target_open_with_backing:
280            result = self.vm.qmp('blockdev-add', node_name="backing",
281                                 driver="null-co")
282            self.assert_qmp(result, 'return', {})
283            result = self.vm.qmp('blockdev-snapshot', node="backing",
284                                 overlay="target")
285            self.assert_qmp(result, 'return', {})
286
287class TestBlockdevMirrorSnapshotIothread(TestBlockdevMirrorSnapshot):
288    use_iothread = True
289
290class TestCommit(BaseClass):
291    existing = False
292
293    def testCommit(self):
294        result = self.vm.qmp('block-commit', job_id='commit-job',
295                             device='source', base=back1_img)
296        self.assert_qmp(result, 'return', {})
297
298        self.vm.event_wait('BLOCK_JOB_READY')
299
300        result = self.vm.qmp('block-job-complete', device='commit-job')
301        self.assert_qmp(result, 'return', {})
302
303        self.vm.event_wait('BLOCK_JOB_COMPLETED')
304
305        node = self.findBlockNode(None, 'qdev0')
306        self.assert_qmp(node, 'image' + '/backing-image' * 0 + '/filename',
307                        back1_img)
308        self.assert_qmp(node, 'image' + '/backing-image' * 1 + '/filename',
309                        back0_img)
310        self.assert_qmp_absent(node, 'image' + '/backing-image' * 2 +
311                               '/filename')
312
313        self.assertIntactSourceBackingChain()
314
315
316BaseClass = None
317MirrorBaseClass = None
318
319if __name__ == '__main__':
320    iotests.main(supported_fmts=['qcow2'],
321                 supported_protocols=['file'])
322