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
|
#!/usr/bin/env python3
#
# Test for preallocate filter
#
# Copyright (c) 2020 Virtuozzo International GmbH.
#
# 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
import iotests
MiB = 1024 * 1024
disk = os.path.join(iotests.test_dir, 'disk')
overlay = os.path.join(iotests.test_dir, 'overlay')
refdisk = os.path.join(iotests.test_dir, 'refdisk')
drive_opts = f'node-name=disk,driver={iotests.imgfmt},' \
f'file.node-name=filter,file.driver=preallocate,' \
f'file.file.node-name=file,file.file.filename={disk}'
class TestPreallocateBase(iotests.QMPTestCase):
def setUp(self):
iotests.qemu_img_create('-f', iotests.imgfmt, disk, str(10 * MiB))
def tearDown(self):
try:
self.check_small()
check = iotests.qemu_img_check(disk)
self.assertFalse('leaks' in check)
self.assertFalse('corruptions' in check)
self.assertEqual(check['check-errors'], 0)
finally:
os.remove(disk)
def check_big(self):
self.assertTrue(os.path.getsize(disk) > 100 * MiB)
def check_small(self):
self.assertTrue(os.path.getsize(disk) < 10 * MiB)
class TestQemuImg(TestPreallocateBase):
def test_qemu_img(self):
p = iotests.QemuIoInteractive('--image-opts', drive_opts)
p.cmd('write 0 1M')
p.cmd('flush')
self.check_big()
p.close()
class TestPreallocateFilter(TestPreallocateBase):
def setUp(self):
super().setUp()
self.vm = iotests.VM().add_drive(path=None, opts=drive_opts)
self.vm.launch()
def tearDown(self):
self.vm.shutdown()
super().tearDown()
def test_prealloc(self):
self.vm.hmp_qemu_io('drive0', 'write 0 1M')
self.check_big()
def test_external_snapshot(self):
self.test_prealloc()
self.vm.cmd('blockdev-snapshot-sync', node_name='disk',
snapshot_file=overlay,
snapshot_node_name='overlay')
# on reopen to r-o base preallocation should be dropped
self.check_small()
self.vm.hmp_qemu_io('drive0', 'write 1M 1M')
self.vm.cmd('block-commit', device='overlay')
self.complete_and_wait()
# commit of new megabyte should trigger preallocation
self.check_big()
def test_reopen_opts(self):
self.vm.cmd('blockdev-reopen', options=[{
'node-name': 'disk',
'driver': iotests.imgfmt,
'file': {
'node-name': 'filter',
'driver': 'preallocate',
'prealloc-size': 20 * MiB,
'prealloc-align': 5 * MiB,
'file': {
'node-name': 'file',
'driver': 'file',
'filename': disk
}
}
}])
self.vm.hmp_qemu_io('drive0', 'write 0 1M')
self.assertTrue(os.path.getsize(disk) == 25 * MiB)
class TestTruncate(iotests.QMPTestCase):
def setUp(self):
iotests.qemu_img_create('-f', iotests.imgfmt, disk, str(10 * MiB))
iotests.qemu_img_create('-f', iotests.imgfmt, refdisk, str(10 * MiB))
def tearDown(self):
os.remove(disk)
os.remove(refdisk)
def do_test(self, prealloc_mode, new_size):
iotests.qemu_io('--image-opts', '-c', 'write 0 10M', '-c',
f'truncate -m {prealloc_mode} {new_size}',
drive_opts)
iotests.qemu_io('-f', iotests.imgfmt, '-c', 'write 0 10M',
'-c', f'truncate -m {prealloc_mode} {new_size}',
refdisk)
stat = os.stat(disk)
refstat = os.stat(refdisk)
# The preallocate filter may keep cluster alignment when shrinking,
# so ignore small differences
self.assertLess(abs(stat.st_size - refstat.st_size), 64 * 1024)
# Preallocate filter may leak some internal clusters (for example, if
# guest write far over EOF, skipping some clusters - they will remain
# fallocated, preallocate filter don't care about such leaks, it drops
# only trailing preallocation.
self.assertLess(abs(stat.st_blocks - refstat.st_blocks) * 512,
1024 * 1024)
def test_real_shrink(self):
self.do_test('off', '5M')
def test_truncate_inside_preallocated_area__falloc(self):
self.do_test('falloc', '50M')
def test_truncate_inside_preallocated_area__metadata(self):
self.do_test('metadata', '50M')
def test_truncate_inside_preallocated_area__full(self):
self.do_test('full', '50M')
def test_truncate_inside_preallocated_area__off(self):
self.do_test('off', '50M')
def test_truncate_over_preallocated_area__falloc(self):
self.do_test('falloc', '150M')
def test_truncate_over_preallocated_area__metadata(self):
self.do_test('metadata', '150M')
def test_truncate_over_preallocated_area__full(self):
self.do_test('full', '150M')
def test_truncate_over_preallocated_area__off(self):
self.do_test('off', '150M')
if __name__ == '__main__':
iotests.main(supported_fmts=['qcow2'], required_fmts=['preallocate'])
|
