tests/qemu-iotests/155

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