xref: /qemu/tests/qemu-iotests/044 (revision a8d25326) 
1#!/usr/bin/env python
2#
3# Tests growing a large refcount table.
4#
5# Copyright (C) 2012 Red Hat, Inc.
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
21import time
22import os
23import qcow2
24from qcow2 import QcowHeader
25import iotests
26from iotests import qemu_img, qemu_img_verbose, qemu_io
27import struct
28import subprocess
29import sys
30
31if sys.version_info.major == 2:
32    range = xrange
33
34test_img = os.path.join(iotests.test_dir, 'test.img')
35
36class TestRefcountTableGrowth(iotests.QMPTestCase):
37    '''Abstract base class for image mirroring test cases'''
38
39    def preallocate(self, name):
40        fd = open(name, "r+b")
41        try:
42            off_reftable = 512
43            off_refblock = off_reftable + (512 * 512)
44            off_l1       = off_refblock + (512 * 512 * 64)
45            off_l2       = off_l1 + (512 * 512 * 4 * 8)
46            off_data     = off_l2 + (512 * 512 * 4 * 512)
47
48            # Write a new header
49            h = QcowHeader(fd)
50            h.refcount_table_offset = off_reftable
51            h.refcount_table_clusters = 512
52            h.l1_table_offset = off_l1
53            h.l1_size = 512 * 512 * 4
54            h.update(fd)
55
56            # Write a refcount table
57            fd.seek(off_reftable)
58
59            for i in range(0, h.refcount_table_clusters):
60                sector = b''.join(struct.pack('>Q',
61                    off_refblock + i * 64 * 512 + j * 512)
62                    for j in range(0, 64))
63                fd.write(sector)
64
65            # Write the refcount blocks
66            assert(fd.tell() == off_refblock)
67            sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
68            for block in range(0, h.refcount_table_clusters):
69                fd.write(sector)
70
71            # Write the L1 table
72            assert(fd.tell() == off_l1)
73            assert(off_l2 + 512 * h.l1_size == off_data)
74            table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
75                for j in range(0, h.l1_size))
76            fd.write(table)
77
78            # Write the L2 tables
79            assert(fd.tell() == off_l2)
80            img_file_size = h.refcount_table_clusters * 64 * 256 * 512
81            remaining = img_file_size - off_data
82
83            off = off_data
84            while remaining > 1024 * 512:
85                pytable = list((1 << 63) | off + 512 * j
86                    for j in range(0, 1024))
87                table = struct.pack('>1024Q', *pytable)
88                fd.write(table)
89                remaining = remaining - 1024 * 512
90                off = off + 1024 * 512
91
92            table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
93                for j in range(0, remaining // 512))
94            fd.write(table)
95
96
97            # Data
98            fd.truncate(img_file_size)
99
100
101        finally:
102            fd.close()
103
104
105    def setUp(self):
106        qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
107        self.preallocate(test_img)
108        pass
109
110
111    def tearDown(self):
112        os.remove(test_img)
113        pass
114
115    def test_grow_refcount_table(self):
116        qemu_io('-c', 'write 3800M 1M', test_img)
117        qemu_img_verbose('check' , test_img)
118        pass
119
120if __name__ == '__main__':
121    iotests.main(supported_fmts=['qcow2'])
122