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1 #!/usr/bin/env python3 2 # group: rw quick 3 # 4 # Very specific tests for adjacent commit/stream block jobs 5 # 6 # Copyright (C) 2019 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 # Creator/Owner: Hanna Reitz <hreitz@redhat.com> 22 23 import iotests 24 from iotests import log, qemu_img, qemu_io, \ 25 filter_qmp_testfiles, filter_qmp_imgfmt 26 27 # Returns a node for blockdev-add 28 def node(node_name, path, backing=None, fmt=None, throttle=None): 29 if fmt is None: 30 fmt = iotests.imgfmt 31 32 res = { 33 'node-name': node_name, 34 'driver': fmt, 35 'file': { 36 'driver': 'file', 37 'filename': path 38 } 39 } 40 41 if backing is not None: 42 res['backing'] = backing 43 44 if throttle: 45 res['file'] = { 46 'driver': 'throttle', 47 'throttle-group': throttle, 48 'file': res['file'] 49 } 50 51 return res 52 53 # Finds a node in the debug block graph 54 def find_graph_node(graph, node_id): 55 return next(node for node in graph['nodes'] if node['id'] == node_id) 56 57 58 def test_concurrent_finish(write_to_stream_node): 59 log('') 60 log('=== Commit and stream finish concurrently (letting %s write) ===' % \ 61 ('stream' if write_to_stream_node else 'commit')) 62 log('') 63 64 # All chosen in such a way that when the commit job wants to 65 # finish, it polls and thus makes stream finish concurrently -- 66 # and the other way around, depending on whether the commit job 67 # is finalized before stream completes or not. 68 69 with iotests.FilePath('node4.img') as node4_path, \ 70 iotests.FilePath('node3.img') as node3_path, \ 71 iotests.FilePath('node2.img') as node2_path, \ 72 iotests.FilePath('node1.img') as node1_path, \ 73 iotests.FilePath('node0.img') as node0_path, \ 74 iotests.VM() as vm: 75 76 # It is important to use raw for the base layer (so that 77 # permissions are just handed through to the protocol layer) 78 qemu_img('create', '-f', 'raw', node0_path, '64M') 79 80 stream_throttle=None 81 commit_throttle=None 82 83 for path in [node1_path, node2_path, node3_path, node4_path]: 84 qemu_img('create', '-f', iotests.imgfmt, path, '64M') 85 86 if write_to_stream_node: 87 # This is what (most of the time) makes commit finish 88 # earlier and then pull in stream 89 qemu_io(node2_path, 90 '-c', 'write %iK 64K' % (65536 - 192), 91 '-c', 'write %iK 64K' % (65536 - 64)) 92 93 stream_throttle='tg' 94 else: 95 # And this makes stream finish earlier 96 qemu_io(node1_path, '-c', 'write %iK 64K' % (65536 - 64)) 97 98 commit_throttle='tg' 99 100 vm.launch() 101 102 vm.qmp_log('object-add', 103 qom_type='throttle-group', 104 id='tg', 105 limits={ 106 'iops-write': 1, 107 'iops-write-max': 1 108 }) 109 110 vm.qmp_log('blockdev-add', 111 filters=[filter_qmp_testfiles, filter_qmp_imgfmt], 112 **node('node4', node4_path, throttle=stream_throttle, 113 backing=node('node3', node3_path, 114 backing=node('node2', node2_path, 115 backing=node('node1', node1_path, 116 backing=node('node0', node0_path, throttle=commit_throttle, 117 fmt='raw')))))) 118 119 vm.qmp_log('block-commit', 120 job_id='commit', 121 device='node4', 122 filter_node_name='commit-filter', 123 top_node='node1', 124 base_node='node0', 125 auto_finalize=False) 126 127 vm.qmp_log('block-stream', 128 job_id='stream', 129 device='node3', 130 base_node='commit-filter') 131 132 if write_to_stream_node: 133 vm.run_job('commit', auto_finalize=False, auto_dismiss=True) 134 vm.run_job('stream', auto_finalize=True, auto_dismiss=True) 135 else: 136 # No, the jobs do not really finish concurrently here, 137 # the stream job does complete strictly before commit. 138 # But still, this is close enough for what we want to 139 # test. 140 vm.run_job('stream', auto_finalize=True, auto_dismiss=True) 141 vm.run_job('commit', auto_finalize=False, auto_dismiss=True) 142 143 # Assert that the backing node of node3 is node 0 now 144 graph = vm.qmp('x-debug-query-block-graph')['return'] 145 for edge in graph['edges']: 146 if edge['name'] == 'backing' and \ 147 find_graph_node(graph, edge['parent'])['name'] == 'node3': 148 assert find_graph_node(graph, edge['child'])['name'] == 'node0' 149 break 150 151 152 def main(): 153 log('Running tests:') 154 test_concurrent_finish(True) 155 test_concurrent_finish(False) 156 157 if __name__ == '__main__': 158 # Need backing file and change-backing-file support 159 iotests.script_main(main, 160 supported_fmts=['qcow2', 'qed'], 161 supported_platforms=['linux'])