xref: /openbmc/qemu/tests/qemu-iotests/242 (revision 09a274d8) 
1#!/usr/bin/env python
2#
3# Test for qcow2 bitmap printed information
4#
5# Copyright (c) 2019 Virtuozzo 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
21import iotests
22import json
23from iotests import qemu_img_create, qemu_io, qemu_img_pipe, \
24    file_path, img_info_log, log, filter_qemu_io
25
26iotests.verify_image_format(supported_fmts=['qcow2'])
27
28disk = file_path('disk')
29chunk = 256 * 1024
30bitmap_flag_unknown = 1 << 2
31# flag_offset = 5*cluster_size + flag_offset_in_bitmap_directory_entry
32flag_offset = 0x5000f
33
34
35def print_bitmap(extra_args):
36    log('qemu-img info dump:\n')
37    img_info_log(disk, extra_args=extra_args)
38    result = json.loads(qemu_img_pipe('info', '--force-share',
39                                      '--output=json', disk))
40    if 'bitmaps' in result['format-specific']['data']:
41        bitmaps = result['format-specific']['data']['bitmaps']
42        log('The same bitmaps in JSON format:')
43        log(bitmaps, indent=2)
44    else:
45        log('No bitmap in JSON format output')
46
47
48def add_bitmap(bitmap_number, persistent, disabled):
49    granularity = 1 << (13 + bitmap_number)
50    bitmap_name = 'bitmap-' + str(bitmap_number-1)
51    vm = iotests.VM().add_drive(disk)
52    vm.launch()
53    vm.qmp_log('block-dirty-bitmap-add', node='drive0', name=bitmap_name,
54               granularity=granularity, persistent=persistent,
55               disabled=disabled)
56    vm.shutdown()
57
58
59def write_to_disk(offset, size):
60    write = 'write {} {}'.format(offset, size)
61    log(qemu_io('-c', write, disk), filters=[filter_qemu_io])
62
63
64def toggle_flag(offset):
65    with open(disk, "r+b") as f:
66        f.seek(offset, 0)
67        c = f.read(1)
68        toggled = chr(ord(c) ^ bitmap_flag_unknown)
69        f.seek(-1, 1)
70        f.write(toggled)
71
72
73qemu_img_create('-f', iotests.imgfmt, disk, '1M')
74
75for num in range(1, 4):
76    disabled = False
77    if num == 2:
78        disabled = True
79    log('Test {}'.format(num))
80    add_bitmap(num, num > 1, disabled)
81    write_to_disk((num-1) * chunk, chunk)
82    print_bitmap([])
83    log('')
84
85vm = iotests.VM().add_drive(disk)
86vm.launch()
87num += 1
88log('Test {}\nChecking "in-use" flag...'.format(num))
89print_bitmap(['--force-share'])
90vm.shutdown()
91
92num += 1
93log('\nTest {}'.format(num))
94qemu_img_create('-f', iotests.imgfmt, disk, '1M')
95add_bitmap(1, True, False)
96log('Write an unknown bitmap flag \'{}\' into a new QCOW2 image at offset {}'
97    .format(hex(bitmap_flag_unknown), flag_offset))
98toggle_flag(flag_offset)
99img_info_log(disk)
100toggle_flag(flag_offset)
101log('Unset the unknown bitmap flag \'{}\' in the bitmap directory entry:\n'
102    .format(hex(bitmap_flag_unknown)))
103img_info_log(disk)
104log('Test complete')
105