xref: /qemu/tests/qemu-iotests/044 (revision abff1abf) 
1#!/usr/bin/env python3
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
31test_img = os.path.join(iotests.test_dir, 'test.img')
32
33class TestRefcountTableGrowth(iotests.QMPTestCase):
34    '''Abstract base class for image mirroring test cases'''
35
36    def preallocate(self, name):
37        fd = open(name, "r+b")
38        try:
39            off_reftable = 512
40            off_refblock = off_reftable + (512 * 512)
41            off_l1       = off_refblock + (512 * 512 * 64)
42            off_l2       = off_l1 + (512 * 512 * 4 * 8)
43            off_data     = off_l2 + (512 * 512 * 4 * 512)
44
45            # Write a new header
46            h = QcowHeader(fd)
47            h.refcount_table_offset = off_reftable
48            h.refcount_table_clusters = 512
49            h.l1_table_offset = off_l1
50            h.l1_size = 512 * 512 * 4
51            h.update(fd)
52
53            # Write a refcount table
54            fd.seek(off_reftable)
55
56            for i in range(0, h.refcount_table_clusters):
57                sector = b''.join(struct.pack('>Q',
58                    off_refblock + i * 64 * 512 + j * 512)
59                    for j in range(0, 64))
60                fd.write(sector)
61
62            # Write the refcount blocks
63            assert(fd.tell() == off_refblock)
64            sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
65            for block in range(0, h.refcount_table_clusters):
66                fd.write(sector)
67
68            # Write the L1 table
69            assert(fd.tell() == off_l1)
70            assert(off_l2 + 512 * h.l1_size == off_data)
71            table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
72                for j in range(0, h.l1_size))
73            fd.write(table)
74
75            # Write the L2 tables
76            assert(fd.tell() == off_l2)
77            img_file_size = h.refcount_table_clusters * 64 * 256 * 512
78            remaining = img_file_size - off_data
79
80            off = off_data
81            while remaining > 1024 * 512:
82                pytable = list((1 << 63) | off + 512 * j
83                    for j in range(0, 1024))
84                table = struct.pack('>1024Q', *pytable)
85                fd.write(table)
86                remaining = remaining - 1024 * 512
87                off = off + 1024 * 512
88
89            table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
90                for j in range(0, remaining // 512))
91            fd.write(table)
92
93
94            # Data
95            fd.truncate(img_file_size)
96
97
98        finally:
99            fd.close()
100
101
102    def setUp(self):
103        qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
104        self.preallocate(test_img)
105        pass
106
107
108    def tearDown(self):
109        os.remove(test_img)
110        pass
111
112    def test_grow_refcount_table(self):
113        qemu_io('-c', 'write 3800M 1M', test_img)
114        qemu_img_verbose('check' , test_img)
115        pass
116
117if __name__ == '__main__':
118    iotests.main(supported_fmts=['qcow2'],
119                 supported_protocols=['file'])
120