tests/qemu-iotests/151

   1 #!/usr/bin/env python
   2 #
   3 # Tests for active mirroring
   4 #
   5 # Copyright (C) 2018 Red Hat, Inc.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20
  21 import os
  22 import iotests
  23 from iotests import qemu_img
  24
  25 source_img = os.path.join(iotests.test_dir, 'source.' + iotests.imgfmt)
  26 target_img = os.path.join(iotests.test_dir, 'target.' + iotests.imgfmt)
  27
  28 class TestActiveMirror(iotests.QMPTestCase):
  29     image_len = 128 * 1024 * 1024 # MB
  30     potential_writes_in_flight = True
  31
  32     def setUp(self):
  33         qemu_img('create', '-f', iotests.imgfmt, source_img, '128M')
  34         qemu_img('create', '-f', iotests.imgfmt, target_img, '128M')
  35
  36         blk_source = {'id': 'source',
  37                       'if': 'none',
  38                       'node-name': 'source-node',
  39                       'driver': iotests.imgfmt,
  40                       'file': {'driver': 'file',
  41                                'filename': source_img}}
  42
  43         blk_target = {'node-name': 'target-node',
  44                       'driver': iotests.imgfmt,
  45                       'file': {'driver': 'file',
  46                                'filename': target_img}}
  47
  48         self.vm = iotests.VM()
  49         self.vm.add_drive_raw(self.vm.qmp_to_opts(blk_source))
  50         self.vm.add_blockdev(self.vm.qmp_to_opts(blk_target))
  51         self.vm.add_device('virtio-blk,drive=source')
  52         self.vm.launch()
  53
  54     def tearDown(self):
  55         self.vm.shutdown()
  56
  57         if not self.potential_writes_in_flight:
  58             self.assertTrue(iotests.compare_images(source_img, target_img),
  59                             'mirror target does not match source')
  60
  61         os.remove(source_img)
  62         os.remove(target_img)
  63
  64     def doActiveIO(self, sync_source_and_target):
  65         # Fill the source image
  66         self.vm.hmp_qemu_io('source',
  67                             'write -P 1 0 %i' % self.image_len);
  68
  69         # Start some background requests
  70         for offset in range(1 * self.image_len // 8, 3 * self.image_len // 8, 1024 * 1024):
  71             self.vm.hmp_qemu_io('source', 'aio_write -P 2 %i 1M' % offset)
  72         for offset in range(2 * self.image_len // 8, 3 * self.image_len // 8, 1024 * 1024):
  73             self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
  74
  75         # Start the block job
  76         result = self.vm.qmp('blockdev-mirror',
  77                              job_id='mirror',
  78                              filter_node_name='mirror-node',
  79                              device='source-node',
  80                              target='target-node',
  81                              sync='full',
  82                              copy_mode='write-blocking')
  83         self.assert_qmp(result, 'return', {})
  84
  85         # Start some more requests
  86         for offset in range(3 * self.image_len // 8, 5 * self.image_len // 8, 1024 * 1024):
  87             self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset)
  88         for offset in range(4 * self.image_len // 8, 5 * self.image_len // 8, 1024 * 1024):
  89             self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
  90
  91         # Wait for the READY event
  92         self.wait_ready(drive='mirror')
  93
  94         # Now start some final requests; all of these (which land on
  95         # the source) should be settled using the active mechanism.
  96         # The mirror code itself asserts that the source BDS's dirty
  97         # bitmap will stay clean between READY and COMPLETED.
  98         for offset in range(5 * self.image_len // 8, 7 * self.image_len // 8, 1024 * 1024):
  99             self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset)
 100         for offset in range(6 * self.image_len // 8, 7 * self.image_len // 8, 1024 * 1024):
 101             self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
 102
 103         if sync_source_and_target:
 104             # If source and target should be in sync after the mirror,
 105             # we have to flush before completion
 106             self.vm.hmp_qemu_io('source', 'aio_flush')
 107             self.potential_writes_in_flight = False
 108
 109         self.complete_and_wait(drive='mirror', wait_ready=False)
 110
 111     def testActiveIO(self):
 112         self.doActiveIO(False)
 113
 114     def testActiveIOFlushed(self):
 115         self.doActiveIO(True)
 116
 117
 118
 119 if __name__ == '__main__':
 120     iotests.main(supported_fmts=['qcow2', 'raw'])