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1#!/usr/bin/env python3 2# group: rw 3# 4# Tests for active mirroring 5# 6# Copyright (C) 2018 Red Hat, Inc. 7# 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. 12# 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. 17# 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/>. 20# 21 22import os 23import iotests 24from iotests import qemu_img 25 26source_img = os.path.join(iotests.test_dir, 'source.' + iotests.imgfmt) 27target_img = os.path.join(iotests.test_dir, 'target.' + iotests.imgfmt) 28 29class TestActiveMirror(iotests.QMPTestCase): 30 image_len = 128 * 1024 * 1024 # MB 31 potential_writes_in_flight = True 32 33 def setUp(self): 34 qemu_img('create', '-f', iotests.imgfmt, source_img, '128M') 35 qemu_img('create', '-f', iotests.imgfmt, target_img, '128M') 36 37 blk_source = {'id': 'source', 38 'if': 'none', 39 'node-name': 'source-node', 40 'driver': iotests.imgfmt, 41 'file': {'driver': 'blkdebug', 42 'image': {'driver': 'file', 43 'filename': source_img}}} 44 45 blk_target = {'node-name': 'target-node', 46 'driver': iotests.imgfmt, 47 'file': {'driver': 'file', 48 'filename': target_img}} 49 50 self.vm = iotests.VM() 51 self.vm.add_drive_raw(self.vm.qmp_to_opts(blk_source)) 52 self.vm.add_blockdev(self.vm.qmp_to_opts(blk_target)) 53 self.vm.add_device('virtio-blk,drive=source') 54 self.vm.launch() 55 56 def tearDown(self): 57 self.vm.shutdown() 58 59 if not self.potential_writes_in_flight: 60 self.assertTrue(iotests.compare_images(source_img, target_img), 61 'mirror target does not match source') 62 63 os.remove(source_img) 64 os.remove(target_img) 65 66 def doActiveIO(self, sync_source_and_target): 67 # Fill the source image 68 self.vm.hmp_qemu_io('source', 69 'write -P 1 0 %i' % self.image_len); 70 71 # Start some background requests 72 for offset in range(1 * self.image_len // 8, 3 * self.image_len // 8, 1024 * 1024): 73 self.vm.hmp_qemu_io('source', 'aio_write -P 2 %i 1M' % offset) 74 for offset in range(2 * self.image_len // 8, 3 * self.image_len // 8, 1024 * 1024): 75 self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset) 76 77 # Start the block job 78 result = self.vm.qmp('blockdev-mirror', 79 job_id='mirror', 80 filter_node_name='mirror-node', 81 device='source-node', 82 target='target-node', 83 sync='full', 84 copy_mode='write-blocking') 85 self.assert_qmp(result, 'return', {}) 86 87 # Start some more requests 88 for offset in range(3 * self.image_len // 8, 5 * self.image_len // 8, 1024 * 1024): 89 self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset) 90 for offset in range(4 * self.image_len // 8, 5 * self.image_len // 8, 1024 * 1024): 91 self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset) 92 93 # Wait for the READY event 94 self.wait_ready(drive='mirror') 95 96 # Now start some final requests; all of these (which land on 97 # the source) should be settled using the active mechanism. 98 # The mirror code itself asserts that the source BDS's dirty 99 # bitmap will stay clean between READY and COMPLETED. 100 for offset in range(5 * self.image_len // 8, 7 * self.image_len // 8, 1024 * 1024): 101 self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset) 102 for offset in range(6 * self.image_len // 8, 7 * self.image_len // 8, 1024 * 1024): 103 self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset) 104 105 if sync_source_and_target: 106 # If source and target should be in sync after the mirror, 107 # we have to flush before completion 108 self.vm.hmp_qemu_io('source', 'aio_flush') 109 self.potential_writes_in_flight = False 110 111 self.complete_and_wait(drive='mirror', wait_ready=False) 112 113 def testActiveIO(self): 114 self.doActiveIO(False) 115 116 def testActiveIOFlushed(self): 117 self.doActiveIO(True) 118 119 def testUnalignedActiveIO(self): 120 # Fill the source image 121 result = self.vm.hmp_qemu_io('source', 'write -P 1 0 2M') 122 123 # Start the block job (very slowly) 124 result = self.vm.qmp('blockdev-mirror', 125 job_id='mirror', 126 filter_node_name='mirror-node', 127 device='source-node', 128 target='target-node', 129 sync='full', 130 copy_mode='write-blocking', 131 buf_size=(1048576 // 4), 132 speed=1) 133 self.assert_qmp(result, 'return', {}) 134 135 # Start an unaligned request to a dirty area 136 result = self.vm.hmp_qemu_io('source', 'write -P 2 %i 1' % (1048576 + 42)) 137 138 # Let the job finish 139 result = self.vm.qmp('block-job-set-speed', device='mirror', speed=0) 140 self.assert_qmp(result, 'return', {}) 141 self.complete_and_wait(drive='mirror') 142 143 self.potential_writes_in_flight = False 144 145 def testIntersectingActiveIO(self): 146 # Fill the source image 147 result = self.vm.hmp_qemu_io('source', 'write -P 1 0 2M') 148 149 # Start the block job (very slowly) 150 result = self.vm.qmp('blockdev-mirror', 151 job_id='mirror', 152 filter_node_name='mirror-node', 153 device='source-node', 154 target='target-node', 155 sync='full', 156 copy_mode='write-blocking', 157 speed=1) 158 159 self.vm.hmp_qemu_io('source', 'break write_aio A') 160 self.vm.hmp_qemu_io('source', 'aio_write 0 1M') # 1 161 self.vm.hmp_qemu_io('source', 'wait_break A') 162 self.vm.hmp_qemu_io('source', 'aio_write 0 2M') # 2 163 self.vm.hmp_qemu_io('source', 'aio_write 0 2M') # 3 164 165 # Now 2 and 3 are in mirror_wait_on_conflicts, waiting for 1 166 167 self.vm.hmp_qemu_io('source', 'break write_aio B') 168 self.vm.hmp_qemu_io('source', 'aio_write 1M 2M') # 4 169 self.vm.hmp_qemu_io('source', 'wait_break B') 170 171 # 4 doesn't wait for 2 and 3, because they didn't yet set 172 # in_flight_bitmap. So, nothing prevents 4 to go except for our 173 # break-point B. 174 175 self.vm.hmp_qemu_io('source', 'resume A') 176 177 # Now we resumed 1, so 2 and 3 goes to the next iteration of while loop 178 # in mirror_wait_on_conflicts(). They don't exit, as bitmap is dirty 179 # due to request 4. 180 # In the past at that point 2 and 3 would wait for each other producing 181 # a dead-lock. Now this is fixed and they will wait for request 4. 182 183 self.vm.hmp_qemu_io('source', 'resume B') 184 185 # After resuming 4, one of 2 and 3 goes first and set in_flight_bitmap, 186 # so the other will wait for it. 187 188 result = self.vm.qmp('block-job-set-speed', device='mirror', speed=0) 189 self.assert_qmp(result, 'return', {}) 190 self.complete_and_wait(drive='mirror') 191 192 self.potential_writes_in_flight = False 193 194 195if __name__ == '__main__': 196 iotests.main(supported_fmts=['qcow2', 'raw'], 197 supported_protocols=['file'])