4 # Tests for active mirroring
6 # Copyright (C) 2018 Red Hat, Inc.
8 # This program is free software; you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation; either version 2 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
24 from iotests import qemu_img
26 source_img = os.path.join(iotests.test_dir, 'source.' + iotests.imgfmt)
27 target_img = os.path.join(iotests.test_dir, 'target.' + iotests.imgfmt)
29 class TestActiveMirror(iotests.QMPTestCase):
30 image_len = 128 * 1024 * 1024 # MB
31 potential_writes_in_flight = True
34 qemu_img('create', '-f', iotests.imgfmt, source_img, '128M')
35 qemu_img('create', '-f', iotests.imgfmt, target_img, '128M')
37 blk_source = {'id': 'source',
39 'node-name': 'source-node',
40 'driver': iotests.imgfmt,
41 'file': {'driver': 'file',
42 'filename': source_img}}
44 blk_target = {'node-name': 'target-node',
45 'driver': iotests.imgfmt,
46 'file': {'driver': 'file',
47 'filename': target_img}}
49 self.vm = iotests.VM()
50 self.vm.add_drive_raw(self.vm.qmp_to_opts(blk_source))
51 self.vm.add_blockdev(self.vm.qmp_to_opts(blk_target))
52 self.vm.add_device('virtio-blk,drive=source')
58 if not self.potential_writes_in_flight:
59 self.assertTrue(iotests.compare_images(source_img, target_img),
60 'mirror target does not match source')
65 def doActiveIO(self, sync_source_and_target):
66 # Fill the source image
67 self.vm.hmp_qemu_io('source',
68 'write -P 1 0 %i' % self.image_len);
70 # Start some background requests
71 for offset in range(1 * self.image_len // 8, 3 * self.image_len // 8, 1024 * 1024):
72 self.vm.hmp_qemu_io('source', 'aio_write -P 2 %i 1M' % offset)
73 for offset in range(2 * self.image_len // 8, 3 * self.image_len // 8, 1024 * 1024):
74 self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
77 result = self.vm.qmp('blockdev-mirror',
79 filter_node_name='mirror-node',
83 copy_mode='write-blocking')
84 self.assert_qmp(result, 'return', {})
86 # Start some more requests
87 for offset in range(3 * self.image_len // 8, 5 * self.image_len // 8, 1024 * 1024):
88 self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset)
89 for offset in range(4 * self.image_len // 8, 5 * self.image_len // 8, 1024 * 1024):
90 self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
92 # Wait for the READY event
93 self.wait_ready(drive='mirror')
95 # Now start some final requests; all of these (which land on
96 # the source) should be settled using the active mechanism.
97 # The mirror code itself asserts that the source BDS's dirty
98 # bitmap will stay clean between READY and COMPLETED.
99 for offset in range(5 * self.image_len // 8, 7 * self.image_len // 8, 1024 * 1024):
100 self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset)
101 for offset in range(6 * self.image_len // 8, 7 * self.image_len // 8, 1024 * 1024):
102 self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
104 if sync_source_and_target:
105 # If source and target should be in sync after the mirror,
106 # we have to flush before completion
107 self.vm.hmp_qemu_io('source', 'aio_flush')
108 self.potential_writes_in_flight = False
110 self.complete_and_wait(drive='mirror', wait_ready=False)
112 def testActiveIO(self):
113 self.doActiveIO(False)
115 def testActiveIOFlushed(self):
116 self.doActiveIO(True)
118 def testUnalignedActiveIO(self):
119 # Fill the source image
120 result = self.vm.hmp_qemu_io('source', 'write -P 1 0 2M')
122 # Start the block job (very slowly)
123 result = self.vm.qmp('blockdev-mirror',
125 filter_node_name='mirror-node',
126 device='source-node',
127 target='target-node',
129 copy_mode='write-blocking',
130 buf_size=(1048576 // 4),
132 self.assert_qmp(result, 'return', {})
134 # Start an unaligned request to a dirty area
135 result = self.vm.hmp_qemu_io('source', 'write -P 2 %i 1' % (1048576 + 42))
138 result = self.vm.qmp('block-job-set-speed', device='mirror', speed=0)
139 self.assert_qmp(result, 'return', {})
140 self.complete_and_wait(drive='mirror')
142 self.potential_writes_in_flight = False
145 if __name__ == '__main__':
146 iotests.main(supported_fmts=['qcow2', 'raw'],
147 supported_protocols=['file'])