xref: /openbmc/qemu/tests/qemu-iotests/242 (revision 19f70347) 
1#!/usr/bin/env python3
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
23import struct
24from iotests import qemu_img_create, qemu_io, qemu_img_pipe, \
25    file_path, img_info_log, log, filter_qemu_io
26
27iotests.verify_image_format(supported_fmts=['qcow2'])
28
29disk = file_path('disk')
30chunk = 256 * 1024
31bitmap_flag_unknown = 1 << 2
32# flag_offset = 5*cluster_size + flag_offset_in_bitmap_directory_entry
33flag_offset = 0x5000f
34
35
36def print_bitmap(extra_args):
37    log('qemu-img info dump:\n')
38    img_info_log(disk, extra_args=extra_args)
39    result = json.loads(qemu_img_pipe('info', '--force-share',
40                                      '--output=json', disk))
41    if 'bitmaps' in result['format-specific']['data']:
42        bitmaps = result['format-specific']['data']['bitmaps']
43        log('The same bitmaps in JSON format:')
44        log(bitmaps, indent=2)
45    else:
46        log('No bitmap in JSON format output')
47
48
49def add_bitmap(bitmap_number, persistent, disabled):
50    granularity = 1 << (13 + bitmap_number)
51    bitmap_name = 'bitmap-' + str(bitmap_number-1)
52    vm = iotests.VM().add_drive(disk)
53    vm.launch()
54    vm.qmp_log('block-dirty-bitmap-add', node='drive0', name=bitmap_name,
55               granularity=granularity, persistent=persistent,
56               disabled=disabled)
57    vm.shutdown()
58
59
60def write_to_disk(offset, size):
61    write = 'write {} {}'.format(offset, size)
62    log(qemu_io('-c', write, disk), filters=[filter_qemu_io])
63
64
65def toggle_flag(offset):
66    with open(disk, "r+b") as f:
67        f.seek(offset, 0)
68        # Read one byte in a way compatible with Python 2
69        flags = struct.unpack("B", f.read(1))
70        toggled = flags[0] ^ bitmap_flag_unknown
71        f.seek(-1, 1)
72        f.write(struct.pack("B", toggled))
73
74
75qemu_img_create('-f', iotests.imgfmt, disk, '1M')
76
77for num in range(1, 4):
78    disabled = False
79    if num == 2:
80        disabled = True
81    log('Test {}'.format(num))
82    add_bitmap(num, num > 1, disabled)
83    write_to_disk((num-1) * chunk, chunk)
84    print_bitmap([])
85    log('')
86
87vm = iotests.VM().add_drive(disk)
88vm.launch()
89num += 1
90log('Test {}\nChecking "in-use" flag...'.format(num))
91print_bitmap(['--force-share'])
92vm.shutdown()
93
94num += 1
95log('\nTest {}'.format(num))
96qemu_img_create('-f', iotests.imgfmt, disk, '1M')
97add_bitmap(1, True, False)
98log('Write an unknown bitmap flag \'{}\' into a new QCOW2 image at offset {}'
99    .format(hex(bitmap_flag_unknown), flag_offset))
100toggle_flag(flag_offset)
101img_info_log(disk)
102toggle_flag(flag_offset)
103log('Unset the unknown bitmap flag \'{}\' in the bitmap directory entry:\n'
104    .format(hex(bitmap_flag_unknown)))
105img_info_log(disk)
106log('Test complete')
107