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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
|
#!/usr/bin/env python3
# group: rw quick
#
# This test covers the basic fleecing workflow, which provides a
# point-in-time snapshot of a node that can be queried over NBD.
#
# Copyright (C) 2018 Red Hat, Inc.
# John helped, too.
#
# 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: John Snow <jsnow@redhat.com>
import iotests
from iotests import log, qemu_img, qemu_io, qemu_io_silent, \
qemu_io_pipe_and_status
iotests.script_initialize(
supported_fmts=['qcow2'],
supported_platforms=['linux'],
required_fmts=['copy-before-write'],
unsupported_imgopts=['compat']
)
patterns = [('0x5d', '0', '64k'),
('0xd5', '1M', '64k'),
('0xdc', '32M', '64k'),
('0xcd', '0x3ff0000', '64k')] # 64M - 64K
overwrite = [('0xab', '0', '64k'), # Full overwrite
('0xad', '0x00f8000', '64k'), # Partial-left (1M-32K)
('0x1d', '0x2008000', '64k'), # Partial-right (32M+32K)
('0xea', '0x3fe0000', '64k')] # Adjacent-left (64M - 128K)
zeroes = [('0', '0x00f8000', '32k'), # Left-end of partial-left (1M-32K)
('0', '0x2010000', '32k'), # Right-end of partial-right (32M+64K)
('0', '0x3fe0000', '64k')] # overwrite[3]
remainder = [('0xd5', '0x108000', '32k'), # Right-end of partial-left [1]
('0xdc', '32M', '32k'), # Left-end of partial-right [2]
('0xcd', '0x3ff0000', '64k')] # patterns[3]
def do_test(vm, use_cbw, use_snapshot_access_filter, base_img_path,
fleece_img_path, nbd_sock_path=None,
target_img_path=None,
bitmap=False):
push_backup = target_img_path is not None
assert (nbd_sock_path is not None) != push_backup
if push_backup:
assert use_cbw
log('--- Setting up images ---')
log('')
assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0
if bitmap:
assert qemu_img('bitmap', '--add', base_img_path, 'bitmap0') == 0
if use_snapshot_access_filter:
assert use_cbw
assert qemu_img('create', '-f', 'raw', fleece_img_path, '64M') == 0
else:
assert qemu_img('create', '-f', 'qcow2', fleece_img_path, '64M') == 0
if push_backup:
assert qemu_img('create', '-f', 'qcow2', target_img_path, '64M') == 0
for p in patterns:
qemu_io('-f', iotests.imgfmt,
'-c', 'write -P%s %s %s' % p, base_img_path)
log('Done')
log('')
log('--- Launching VM ---')
log('')
src_node = 'source'
tmp_node = 'temp'
qom_path = '/machine/peripheral/sda'
vm.add_blockdev(f'driver={iotests.imgfmt},file.driver=file,'
f'file.filename={base_img_path},node-name={src_node}')
vm.add_device('virtio-scsi')
vm.add_device(f'scsi-hd,id=sda,drive={src_node}')
vm.launch()
log('Done')
log('')
log('--- Setting up Fleecing Graph ---')
log('')
if use_snapshot_access_filter:
log(vm.qmp('blockdev-add', {
'node-name': tmp_node,
'driver': 'file',
'filename': fleece_img_path,
}))
else:
# create tmp_node backed by src_node
log(vm.qmp('blockdev-add', {
'driver': 'qcow2',
'node-name': tmp_node,
'file': {
'driver': 'file',
'filename': fleece_img_path,
},
'backing': src_node,
}))
# Establish CBW from source to fleecing node
if use_cbw:
fl_cbw = {
'driver': 'copy-before-write',
'node-name': 'fl-cbw',
'file': src_node,
'target': tmp_node
}
if bitmap:
fl_cbw['bitmap'] = {'node': src_node, 'name': 'bitmap0'}
log(vm.qmp('blockdev-add', fl_cbw))
log(vm.qmp('qom-set', path=qom_path, property='drive', value='fl-cbw'))
if use_snapshot_access_filter:
log(vm.qmp('blockdev-add', {
'driver': 'snapshot-access',
'node-name': 'fl-access',
'file': 'fl-cbw',
}))
else:
log(vm.qmp('blockdev-backup',
job_id='fleecing',
device=src_node,
target=tmp_node,
sync='none'))
export_node = 'fl-access' if use_snapshot_access_filter else tmp_node
if push_backup:
log('')
log('--- Starting actual backup ---')
log('')
log(vm.qmp('blockdev-add', **{
'driver': iotests.imgfmt,
'node-name': 'target',
'file': {
'driver': 'file',
'filename': target_img_path
}
}))
log(vm.qmp('blockdev-backup', device=export_node,
sync='full', target='target',
job_id='push-backup', speed=1))
else:
log('')
log('--- Setting up NBD Export ---')
log('')
nbd_uri = 'nbd+unix:///%s?socket=%s' % (export_node, nbd_sock_path)
log(vm.qmp('nbd-server-start',
{'addr': { 'type': 'unix',
'data': { 'path': nbd_sock_path } } }))
log(vm.qmp('nbd-server-add', device=export_node))
log('')
log('--- Sanity Check ---')
log('')
for p in patterns + zeroes:
cmd = 'read -P%s %s %s' % p
log(cmd)
out, ret = qemu_io_pipe_and_status('-r', '-f', 'raw', '-c', cmd,
nbd_uri)
if ret != 0:
print(out)
log('')
log('--- Testing COW ---')
log('')
for p in overwrite:
cmd = 'write -P%s %s %s' % p
log(cmd)
log(vm.hmp_qemu_io(qom_path, cmd, qdev=True))
if push_backup:
# Check that previous operations were done during backup, not after
# If backup is already finished, it's possible that it was finished
# even before hmp qemu_io write, and we didn't actually test
# copy-before-write operation. This should not happen, as we use
# speed=1. But worth checking.
result = vm.qmp('query-block-jobs')
assert len(result['return']) == 1
result = vm.qmp('block-job-set-speed', device='push-backup', speed=0)
assert result == {'return': {}}
log(vm.event_wait(name='BLOCK_JOB_COMPLETED',
match={'data': {'device': 'push-backup'}}),
filters=[iotests.filter_qmp_event])
log(vm.qmp('blockdev-del', node_name='target'))
log('')
log('--- Verifying Data ---')
log('')
for p in patterns + zeroes:
cmd = 'read -P%s %s %s' % p
log(cmd)
args = ['-r', '-c', cmd]
if push_backup:
args += [target_img_path]
else:
args += ['-f', 'raw', nbd_uri]
out, ret = qemu_io_pipe_and_status(*args)
if ret != 0:
print(out)
log('')
log('--- Cleanup ---')
log('')
if not push_backup:
log(vm.qmp('nbd-server-stop'))
if use_cbw:
if use_snapshot_access_filter:
log(vm.qmp('blockdev-del', node_name='fl-access'))
log(vm.qmp('qom-set', path=qom_path, property='drive', value=src_node))
log(vm.qmp('blockdev-del', node_name='fl-cbw'))
else:
log(vm.qmp('block-job-cancel', device='fleecing'))
e = vm.event_wait('BLOCK_JOB_CANCELLED')
assert e is not None
log(e, filters=[iotests.filter_qmp_event])
log(vm.qmp('blockdev-del', node_name=tmp_node))
vm.shutdown()
log('')
log('--- Confirming writes ---')
log('')
for p in overwrite + remainder:
cmd = 'read -P%s %s %s' % p
log(cmd)
assert qemu_io_silent(base_img_path, '-c', cmd) == 0
log('')
log('Done')
def test(use_cbw, use_snapshot_access_filter,
nbd_sock_path=None, target_img_path=None, bitmap=False):
with iotests.FilePath('base.img') as base_img_path, \
iotests.FilePath('fleece.img') as fleece_img_path, \
iotests.VM() as vm:
do_test(vm, use_cbw, use_snapshot_access_filter, base_img_path,
fleece_img_path, nbd_sock_path, target_img_path,
bitmap=bitmap)
def test_pull(use_cbw, use_snapshot_access_filter, bitmap=False):
with iotests.FilePath('nbd.sock',
base_dir=iotests.sock_dir) as nbd_sock_path:
test(use_cbw, use_snapshot_access_filter, nbd_sock_path, None,
bitmap=bitmap)
def test_push():
with iotests.FilePath('target.img') as target_img_path:
test(True, True, None, target_img_path)
log('=== Test backup(sync=none) based fleecing ===\n')
test_pull(False, False)
log('=== Test cbw-filter based fleecing ===\n')
test_pull(True, False)
log('=== Test fleecing-format based fleecing ===\n')
test_pull(True, True)
log('=== Test fleecing-format based fleecing with bitmap ===\n')
test_pull(True, True, bitmap=True)
log('=== Test push backup with fleecing ===\n')
test_push()
|
