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iotests: add test 226 for file driver types
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1 #!/usr/bin/env python
2 #
3 # Tests for shrinking images
4 #
5 # Copyright (c) 2016-2017 Parallels International GmbH
6 #
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 2 of the License, or
10 # (at your option) any later version.
11 #
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 # GNU General Public License for more details.
16 #
17 # You should have received a copy of the GNU General Public License
18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
19 #
20
21 import os, random, iotests, struct, qcow2
22 from iotests import qemu_img, qemu_io, image_size
23
24 test_img = os.path.join(iotests.test_dir, 'test.img')
25 check_img = os.path.join(iotests.test_dir, 'check.img')
26
27 def size_to_int(str):
28     suff = ['B', 'K', 'M', 'G', 'T']
29     return int(str[:-1]) * 1024**suff.index(str[-1:])
30
31 class ShrinkBaseClass(iotests.QMPTestCase):
32     image_len = '128M'
33     shrink_size = '10M'
34     chunk_size = '16M'
35     refcount_bits = '16'
36
37     def __qcow2_check(self, filename):
38         entry_bits = 3
39         entry_size = 1 << entry_bits
40         l1_mask = 0x00fffffffffffe00
41         div_roundup = lambda n, d: (n + d - 1) / d
42
43         def split_by_n(data, n):
44             for x in xrange(0, len(data), n):
45                 yield struct.unpack('>Q', data[x:x + n])[0] & l1_mask
46
47         def check_l1_table(h, l1_data):
48             l1_list = list(split_by_n(l1_data, entry_size))
49             real_l1_size = div_roundup(h.size,
50                                        1 << (h.cluster_bits*2 - entry_size))
51             used, unused = l1_list[:real_l1_size], l1_list[real_l1_size:]
52
53             self.assertTrue(len(used) != 0, "Verifying l1 table content")
54             self.assertFalse(any(unused), "Verifying l1 table content")
55
56         def check_reftable(fd, h, reftable):
57             for offset in split_by_n(reftable, entry_size):
58                 if offset != 0:
59                     fd.seek(offset)
60                     cluster = fd.read(1 << h.cluster_bits)
61                     self.assertTrue(any(cluster), "Verifying reftable content")
62
63         with open(filename, "rb") as fd:
64             h = qcow2.QcowHeader(fd)
65
66             fd.seek(h.l1_table_offset)
67             l1_table = fd.read(h.l1_size << entry_bits)
68
69             fd.seek(h.refcount_table_offset)
70             reftable = fd.read(h.refcount_table_clusters << h.cluster_bits)
71
72             check_l1_table(h, l1_table)
73             check_reftable(fd, h, reftable)
74
75     def __raw_check(self, filename):
76         pass
77
78     image_check = {
79         'qcow2' : __qcow2_check,
80         'raw' : __raw_check
81     }
82
83     def setUp(self):
84         if iotests.imgfmt == 'raw':
85             qemu_img('create', '-f', iotests.imgfmt, test_img, self.image_len)
86             qemu_img('create', '-f', iotests.imgfmt, check_img,
87                      self.shrink_size)
88         else:
89             qemu_img('create', '-f', iotests.imgfmt,
90                      '-o', 'cluster_size=' + self.cluster_size +
91                      ',refcount_bits=' + self.refcount_bits,
92                      test_img, self.image_len)
93             qemu_img('create', '-f', iotests.imgfmt,
94                      '-o', 'cluster_size=%s'% self.cluster_size,
95                      check_img, self.shrink_size)
96         qemu_io('-c', 'write -P 0xff 0 ' + self.shrink_size, check_img)
97
98     def tearDown(self):
99         os.remove(test_img)
100         os.remove(check_img)
101
102     def image_verify(self):
103         self.assertEqual(image_size(test_img), image_size(check_img),
104                          "Verifying image size")
105         self.image_check[iotests.imgfmt](self, test_img)
106
107         if iotests.imgfmt == 'raw':
108             return
109         self.assertEqual(qemu_img('check', test_img), 0,
110                          "Verifying image corruption")
111
112     def test_empty_image(self):
113         qemu_img('resize',  '-f', iotests.imgfmt, '--shrink', test_img,
114                  self.shrink_size)
115
116         self.assertEqual(
117             qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, test_img),
118             qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, check_img),
119             "Verifying image content")
120
121         self.image_verify()
122
123     def test_sequential_write(self):
124         for offs in range(0, size_to_int(self.image_len),
125                           size_to_int(self.chunk_size)):
126             qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size),
127                     test_img)
128
129         qemu_img('resize',  '-f', iotests.imgfmt, '--shrink', test_img,
130                  self.shrink_size)
131
132         self.assertEqual(qemu_img("compare", test_img, check_img), 0,
133                          "Verifying image content")
134
135         self.image_verify()
136
137     def test_random_write(self):
138         offs_list = range(0, size_to_int(self.image_len),
139                           size_to_int(self.chunk_size))
140         random.shuffle(offs_list)
141         for offs in offs_list:
142             qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size),
143                     test_img)
144
145         qemu_img('resize',  '-f', iotests.imgfmt, '--shrink', test_img,
146                  self.shrink_size)
147
148         self.assertEqual(qemu_img("compare", test_img, check_img), 0,
149                          "Verifying image content")
150
151         self.image_verify()
152
153 class TestShrink512(ShrinkBaseClass):
154     image_len = '3M'
155     shrink_size = '1M'
156     chunk_size = '256K'
157     cluster_size = '512'
158     refcount_bits = '64'
159
160 class TestShrink64K(ShrinkBaseClass):
161     cluster_size = '64K'
162
163 class TestShrink1M(ShrinkBaseClass):
164     cluster_size = '1M'
165     refcount_bits = '1'
166
167 ShrinkBaseClass = None
168
169 if __name__ == '__main__':
170     iotests.main(supported_fmts=['raw', 'qcow2'])
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