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
|
#!/usr/bin/env python3
# group: quick
#
# Test bitmap merges.
#
# Copyright (c) 2018 John Snow for 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/>.
#
# owner=jsnow@redhat.com
import iotests
from iotests import log
iotests.script_initialize(supported_fmts=['generic'])
size = 64 * 1024 * 1024
granularity = 64 * 1024
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)
def query_bitmaps(vm):
res = vm.qmp("query-block")
return { "bitmaps": { device['device']: device.get('dirty-bitmaps', []) for
device in res['return'] } }
with iotests.FilePath('img') as img_path, \
iotests.VM() as vm:
log('--- Preparing image & VM ---\n')
iotests.qemu_img_create('-f', iotests.imgfmt, img_path, str(size))
vm.add_drive(img_path)
vm.launch()
log('\n--- Adding preliminary bitmaps A & B ---\n')
vm.qmp_log("block-dirty-bitmap-add", node="drive0",
name="bitmapA", granularity=granularity)
vm.qmp_log("block-dirty-bitmap-add", node="drive0",
name="bitmapB", granularity=granularity)
# Dirties 4 clusters. count=262144
log('\n--- Emulating writes ---\n')
for p in patterns:
cmd = "write -P%s %s %s" % p
log(cmd)
log(vm.hmp_qemu_io("drive0", cmd))
log(query_bitmaps(vm), indent=2)
log('\n--- Submitting & Aborting Transaction ---\n')
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapB" }},
{ "type": "block-dirty-bitmap-add",
"data": { "node": "drive0", "name": "bitmapC",
"granularity": granularity }},
{ "type": "block-dirty-bitmap-clear",
"data": { "node": "drive0", "name": "bitmapA" }},
{ "type": "abort", "data": {}}
])
log(query_bitmaps(vm), indent=2)
log('\n--- Disabling B & Adding C ---\n')
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapB" }},
{ "type": "block-dirty-bitmap-add",
"data": { "node": "drive0", "name": "bitmapC",
"granularity": granularity }},
# Purely extraneous, but test that it works:
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapC" }},
{ "type": "block-dirty-bitmap-enable",
"data": { "node": "drive0", "name": "bitmapC" }},
])
log('\n--- Emulating further writes ---\n')
# Dirties 6 clusters, 3 of which are new in contrast to "A".
# A = 64 * 1024 * (4 + 3) = 458752
# C = 64 * 1024 * 6 = 393216
for p in overwrite:
cmd = "write -P%s %s %s" % p
log(cmd)
log(vm.hmp_qemu_io("drive0", cmd))
log('\n--- Disabling A & C ---\n')
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapA" }},
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapC" }}
])
# A: 7 clusters
# B: 4 clusters
# C: 6 clusters
log(query_bitmaps(vm), indent=2)
log('\n--- Submitting & Aborting Merge Transaction ---\n')
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-add",
"data": { "node": "drive0", "name": "bitmapD",
"disabled": True, "granularity": granularity }},
{ "type": "block-dirty-bitmap-merge",
"data": { "node": "drive0", "target": "bitmapD",
"bitmaps": ["bitmapB", "bitmapC"] }},
{ "type": "abort", "data": {}}
])
log(query_bitmaps(vm), indent=2)
log('\n--- Creating D as a merge of B & C ---\n')
# Good hygiene: create a disabled bitmap as a merge target.
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-add",
"data": { "node": "drive0", "name": "bitmapD",
"disabled": True, "granularity": granularity }},
{ "type": "block-dirty-bitmap-merge",
"data": { "node": "drive0", "target": "bitmapD",
"bitmaps": ["bitmapB", "bitmapC"] }}
])
# A and D should now both have 7 clusters apiece.
# B and C remain unchanged with 4 and 6 respectively.
log(query_bitmaps(vm), indent=2)
# A and D should be equivalent.
# Some formats round the size of the disk, so don't print the checksums.
check_a = vm.qmp('x-debug-block-dirty-bitmap-sha256',
node="drive0", name="bitmapA")['return']['sha256']
check_d = vm.qmp('x-debug-block-dirty-bitmap-sha256',
node="drive0", name="bitmapD")['return']['sha256']
assert(check_a == check_d)
log('\n--- Removing bitmaps A, B, C, and D ---\n')
vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapA")
vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapB")
vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapC")
vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapD")
log('\n--- Final Query ---\n')
log(query_bitmaps(vm), indent=2)
log('\n--- Done ---\n')
vm.shutdown()
|
