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#!/usr/bin/env python3
#
# Very specific tests for adjacent commit/stream block jobs
#
# Copyright (C) 2019 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Creator/Owner: Max Reitz <mreitz@redhat.com>
import iotests
from iotests import log, qemu_img, qemu_io_silent, \
filter_qmp_testfiles, filter_qmp_imgfmt
# Returns a node for blockdev-add
def node(node_name, path, backing=None, fmt=None, throttle=None):
if fmt is None:
fmt = iotests.imgfmt
res = {
'node-name': node_name,
'driver': fmt,
'file': {
'driver': 'file',
'filename': path
}
}
if backing is not None:
res['backing'] = backing
if throttle:
res['file'] = {
'driver': 'throttle',
'throttle-group': throttle,
'file': res['file']
}
return res
# Finds a node in the debug block graph
def find_graph_node(graph, node_id):
return next(node for node in graph['nodes'] if node['id'] == node_id)
def test_concurrent_finish(write_to_stream_node):
log('')
log('=== Commit and stream finish concurrently (letting %s write) ===' % \
('stream' if write_to_stream_node else 'commit'))
log('')
# All chosen in such a way that when the commit job wants to
# finish, it polls and thus makes stream finish concurrently --
# and the other way around, depending on whether the commit job
# is finalized before stream completes or not.
with iotests.FilePath('node4.img') as node4_path, \
iotests.FilePath('node3.img') as node3_path, \
iotests.FilePath('node2.img') as node2_path, \
iotests.FilePath('node1.img') as node1_path, \
iotests.FilePath('node0.img') as node0_path, \
iotests.VM() as vm:
# It is important to use raw for the base layer (so that
# permissions are just handed through to the protocol layer)
assert qemu_img('create', '-f', 'raw', node0_path, '64M') == 0
stream_throttle=None
commit_throttle=None
for path in [node1_path, node2_path, node3_path, node4_path]:
assert qemu_img('create', '-f', iotests.imgfmt, path, '64M') == 0
if write_to_stream_node:
# This is what (most of the time) makes commit finish
# earlier and then pull in stream
assert qemu_io_silent(node2_path,
'-c', 'write %iK 64K' % (65536 - 192),
'-c', 'write %iK 64K' % (65536 - 64)) == 0
stream_throttle='tg'
else:
# And this makes stream finish earlier
assert qemu_io_silent(node1_path,
'-c', 'write %iK 64K' % (65536 - 64)) == 0
commit_throttle='tg'
vm.launch()
vm.qmp_log('object-add',
qom_type='throttle-group',
id='tg',
props={
'x-iops-write': 1,
'x-iops-write-max': 1
})
vm.qmp_log('blockdev-add',
filters=[filter_qmp_testfiles, filter_qmp_imgfmt],
**node('node4', node4_path, throttle=stream_throttle,
backing=node('node3', node3_path,
backing=node('node2', node2_path,
backing=node('node1', node1_path,
backing=node('node0', node0_path, throttle=commit_throttle,
fmt='raw'))))))
vm.qmp_log('block-commit',
job_id='commit',
device='node4',
filter_node_name='commit-filter',
top_node='node1',
base_node='node0',
auto_finalize=False)
vm.qmp_log('block-stream',
job_id='stream',
device='node3',
base_node='commit-filter')
if write_to_stream_node:
vm.run_job('commit', auto_finalize=False, auto_dismiss=True)
vm.run_job('stream', auto_finalize=True, auto_dismiss=True)
else:
# No, the jobs do not really finish concurrently here,
# the stream job does complete strictly before commit.
# But still, this is close enough for what we want to
# test.
vm.run_job('stream', auto_finalize=True, auto_dismiss=True)
vm.run_job('commit', auto_finalize=False, auto_dismiss=True)
# Assert that the backing node of node3 is node 0 now
graph = vm.qmp('x-debug-query-block-graph')['return']
for edge in graph['edges']:
if edge['name'] == 'backing' and \
find_graph_node(graph, edge['parent'])['name'] == 'node3':
assert find_graph_node(graph, edge['child'])['name'] == 'node0'
break
def main():
log('Running tests:')
test_concurrent_finish(True)
test_concurrent_finish(False)
if __name__ == '__main__':
# Need backing file and change-backing-file support
iotests.script_main(main,
supported_fmts=['qcow2', 'qed'],
supported_platforms=['linux'])
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