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
|
#!/usr/bin/env python3
# group: rw
#
# Tests for shrinking images
#
# Copyright (c) 2016-2017 Parallels 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, random, iotests, struct, qcow2, sys
from iotests import qemu_img, qemu_io, image_size
test_img = os.path.join(iotests.test_dir, 'test.img')
check_img = os.path.join(iotests.test_dir, 'check.img')
def size_to_int(str):
suff = ['B', 'K', 'M', 'G', 'T']
return int(str[:-1]) * 1024**suff.index(str[-1:])
class ShrinkBaseClass(iotests.QMPTestCase):
image_len = '128M'
shrink_size = '10M'
chunk_size = '16M'
refcount_bits = '16'
def __qcow2_check(self, filename):
entry_bits = 3
entry_size = 1 << entry_bits
l1_mask = 0x00fffffffffffe00
div_roundup = lambda n, d: (n + d - 1) // d
def split_by_n(data, n):
for x in range(0, len(data), n):
yield struct.unpack('>Q', data[x:x + n])[0] & l1_mask
def check_l1_table(h, l1_data):
l1_list = list(split_by_n(l1_data, entry_size))
real_l1_size = div_roundup(h.size,
1 << (h.cluster_bits*2 - entry_size))
used, unused = l1_list[:real_l1_size], l1_list[real_l1_size:]
self.assertTrue(len(used) != 0, "Verifying l1 table content")
self.assertFalse(any(unused), "Verifying l1 table content")
def check_reftable(fd, h, reftable):
for offset in split_by_n(reftable, entry_size):
if offset != 0:
fd.seek(offset)
cluster = fd.read(1 << h.cluster_bits)
self.assertTrue(any(cluster), "Verifying reftable content")
with open(filename, "rb") as fd:
h = qcow2.QcowHeader(fd)
fd.seek(h.l1_table_offset)
l1_table = fd.read(h.l1_size << entry_bits)
fd.seek(h.refcount_table_offset)
reftable = fd.read(h.refcount_table_clusters << h.cluster_bits)
check_l1_table(h, l1_table)
check_reftable(fd, h, reftable)
def __raw_check(self, filename):
pass
image_check = {
'qcow2' : __qcow2_check,
'raw' : __raw_check
}
def setUp(self):
if iotests.imgfmt == 'raw':
qemu_img('create', '-f', iotests.imgfmt, test_img, self.image_len)
qemu_img('create', '-f', iotests.imgfmt, check_img,
self.shrink_size)
else:
qemu_img('create', '-f', iotests.imgfmt,
'-o', 'cluster_size=' + self.cluster_size +
',refcount_bits=' + self.refcount_bits,
test_img, self.image_len)
qemu_img('create', '-f', iotests.imgfmt,
'-o', 'cluster_size=%s'% self.cluster_size,
check_img, self.shrink_size)
qemu_io('-c', 'write -P 0xff 0 ' + self.shrink_size, check_img)
def tearDown(self):
os.remove(test_img)
os.remove(check_img)
def image_verify(self):
self.assertEqual(image_size(test_img), image_size(check_img),
"Verifying image size")
self.image_check[iotests.imgfmt](self, test_img)
if iotests.imgfmt == 'raw':
return
self.assertEqual(qemu_img('check', test_img), 0,
"Verifying image corruption")
def test_empty_image(self):
qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img,
self.shrink_size)
self.assertEqual(
qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, test_img),
qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, check_img),
"Verifying image content")
self.image_verify()
def test_sequential_write(self):
for offs in range(0, size_to_int(self.image_len),
size_to_int(self.chunk_size)):
qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size),
test_img)
qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img,
self.shrink_size)
self.assertEqual(qemu_img("compare", test_img, check_img), 0,
"Verifying image content")
self.image_verify()
def test_random_write(self):
offs_list = list(range(0, size_to_int(self.image_len),
size_to_int(self.chunk_size)))
random.shuffle(offs_list)
for offs in offs_list:
qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size),
test_img)
qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img,
self.shrink_size)
self.assertEqual(qemu_img("compare", test_img, check_img), 0,
"Verifying image content")
self.image_verify()
class TestShrink512(ShrinkBaseClass):
image_len = '3M'
shrink_size = '1M'
chunk_size = '256K'
cluster_size = '512'
refcount_bits = '64'
class TestShrink64K(ShrinkBaseClass):
cluster_size = '64K'
class TestShrink1M(ShrinkBaseClass):
cluster_size = '1M'
refcount_bits = '1'
ShrinkBaseClass = None
if __name__ == '__main__':
iotests.main(supported_fmts=['raw', 'qcow2'],
supported_protocols=['file'])
|
