tests/qemu-iotests/258

   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'])