1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
#!/usr/bin/env python3
# group: rw auto quick
#
# Test cases for NBD multi-conn advertisement
#
# Copyright (C) 2022 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/>.
import os
from contextlib import contextmanager
from types import ModuleType
import iotests
from iotests import qemu_img_create, qemu_io
disk = os.path.join(iotests.test_dir, 'disk')
size = '4M'
nbd_sock = os.path.join(iotests.sock_dir, 'nbd_sock')
nbd_uri = 'nbd+unix:///{}?socket=' + nbd_sock
nbd: ModuleType
@contextmanager
def open_nbd(export_name):
h = nbd.NBD()
try:
h.connect_uri(nbd_uri.format(export_name))
yield h
finally:
h.shutdown()
class TestNbdMulticonn(iotests.QMPTestCase):
def setUp(self):
qemu_img_create('-f', iotests.imgfmt, disk, size)
qemu_io('-c', 'w -P 1 0 2M', '-c', 'w -P 2 2M 2M', disk)
self.vm = iotests.VM()
self.vm.launch()
self.vm.cmd('blockdev-add', {
'driver': 'qcow2',
'node-name': 'n',
'file': {'driver': 'file', 'filename': disk}
})
def tearDown(self):
self.vm.shutdown()
os.remove(disk)
try:
os.remove(nbd_sock)
except OSError:
pass
@contextmanager
def run_server(self, max_connections=None):
args = {
'addr': {
'type': 'unix',
'data': {'path': nbd_sock}
}
}
if max_connections is not None:
args['max-connections'] = max_connections
self.vm.cmd('nbd-server-start', args)
yield
self.vm.cmd('nbd-server-stop')
def add_export(self, name, writable=None):
args = {
'type': 'nbd',
'id': name,
'node-name': 'n',
'name': name,
}
if writable is not None:
args['writable'] = writable
self.vm.cmd('block-export-add', args)
def test_default_settings(self):
with self.run_server():
self.add_export('r')
self.add_export('w', writable=True)
with open_nbd('r') as h:
self.assertTrue(h.can_multi_conn())
with open_nbd('w') as h:
self.assertTrue(h.can_multi_conn())
def test_limited_connections(self):
with self.run_server(max_connections=1):
self.add_export('r')
self.add_export('w', writable=True)
with open_nbd('r') as h:
self.assertFalse(h.can_multi_conn())
with open_nbd('w') as h:
self.assertFalse(h.can_multi_conn())
def test_parallel_writes(self):
with self.run_server():
self.add_export('w', writable=True)
clients = [nbd.NBD() for _ in range(3)]
for c in clients:
c.connect_uri(nbd_uri.format('w'))
self.assertTrue(c.can_multi_conn())
initial_data = clients[0].pread(1024 * 1024, 0)
self.assertEqual(initial_data, b'\x01' * 1024 * 1024)
updated_data = b'\x03' * 1024 * 1024
clients[1].pwrite(updated_data, 0)
clients[2].flush()
current_data = clients[0].pread(1024 * 1024, 0)
self.assertEqual(updated_data, current_data)
for i in range(3):
clients[i].shutdown()
if __name__ == '__main__':
try:
# Easier to use libnbd than to try and set up parallel
# 'qemu-nbd --list' or 'qemu-io' processes, but not all systems
# have libnbd installed.
import nbd # type: ignore
iotests.main(supported_fmts=['qcow2'])
except ImportError:
iotests.notrun('Python bindings to libnbd are not installed')
|
