xref: /qemu/tests/qemu-iotests/044 (revision 2e8f72ac) 
1#!/usr/bin/env python3
2# group: rw
3#
4# Tests growing a large refcount table.
5#
6# Copyright (C) 2012 Red Hat, Inc.
7#
8# This program is free software; you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation; either version 2 of the License, or
11# (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with this program.  If not, see <http://www.gnu.org/licenses/>.
20#
21
22import time
23import os
24import qcow2
25from qcow2 import QcowHeader
26import iotests
27from iotests import qemu_img, qemu_img_verbose, qemu_io
28import struct
29import subprocess
30import sys
31
32test_img = os.path.join(iotests.test_dir, 'test.img')
33
34class TestRefcountTableGrowth(iotests.QMPTestCase):
35    '''Abstract base class for image mirroring test cases'''
36
37    def preallocate(self, name):
38        fd = open(name, "r+b")
39        try:
40            off_reftable = 512
41            off_refblock = off_reftable + (512 * 512)
42            off_l1       = off_refblock + (512 * 512 * 64)
43            off_l2       = off_l1 + (512 * 512 * 4 * 8)
44            off_data     = off_l2 + (512 * 512 * 4 * 512)
45
46            # Write a new header
47            h = QcowHeader(fd)
48            h.refcount_table_offset = off_reftable
49            h.refcount_table_clusters = 512
50            h.l1_table_offset = off_l1
51            h.l1_size = 512 * 512 * 4
52            h.update(fd)
53
54            # Write a refcount table
55            fd.seek(off_reftable)
56
57            for i in range(0, h.refcount_table_clusters):
58                sector = b''.join(struct.pack('>Q',
59                    off_refblock + i * 64 * 512 + j * 512)
60                    for j in range(0, 64))
61                fd.write(sector)
62
63            # Write the refcount blocks
64            assert(fd.tell() == off_refblock)
65            sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
66            for block in range(0, h.refcount_table_clusters):
67                fd.write(sector)
68
69            # Write the L1 table
70            assert(fd.tell() == off_l1)
71            assert(off_l2 + 512 * h.l1_size == off_data)
72            table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
73                for j in range(0, h.l1_size))
74            fd.write(table)
75
76            # Write the L2 tables
77            assert(fd.tell() == off_l2)
78            img_file_size = h.refcount_table_clusters * 64 * 256 * 512
79            remaining = img_file_size - off_data
80
81            off = off_data
82            while remaining > 1024 * 512:
83                pytable = list((1 << 63) | off + 512 * j
84                    for j in range(0, 1024))
85                table = struct.pack('>1024Q', *pytable)
86                fd.write(table)
87                remaining = remaining - 1024 * 512
88                off = off + 1024 * 512
89
90            table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
91                for j in range(0, remaining // 512))
92            fd.write(table)
93
94
95            # Data
96            fd.truncate(img_file_size)
97
98
99        finally:
100            fd.close()
101
102
103    def setUp(self):
104        qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
105        self.preallocate(test_img)
106        pass
107
108
109    def tearDown(self):
110        os.remove(test_img)
111        pass
112
113    def test_grow_refcount_table(self):
114        qemu_io('-c', 'write 3800M 1M', test_img)
115        qemu_img_verbose('check' , test_img)
116        pass
117
118if __name__ == '__main__':
119    iotests.main(supported_fmts=['qcow2'],
120                 supported_protocols=['file'])
121