xref: /openbmc/qemu/tests/qemu-iotests/242 (revision 05a24871) 
1#!/usr/bin/env python3
2# group: rw quick
3#
4# Test for qcow2 bitmap printed information
5#
6# Copyright (c) 2019 Virtuozzo International GmbH
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 iotests
23import json
24import struct
25from iotests import qemu_img_create, qemu_io, qemu_img_pipe, \
26    file_path, img_info_log, log, filter_qemu_io
27
28iotests.script_initialize(supported_fmts=['qcow2'],
29                          supported_protocols=['file'])
30
31disk = file_path('disk')
32chunk = 256 * 1024
33bitmap_flag_unknown = 1 << 2
34# flag_offset = 5*cluster_size + flag_offset_in_bitmap_directory_entry
35flag_offset = 0x5000f
36
37
38def print_bitmap(extra_args):
39    log('qemu-img info dump:\n')
40    img_info_log(disk, extra_args=extra_args)
41    result = json.loads(qemu_img_pipe('info', '--force-share',
42                                      '--output=json', disk))
43    if 'bitmaps' in result['format-specific']['data']:
44        bitmaps = result['format-specific']['data']['bitmaps']
45        log('The same bitmaps in JSON format:')
46        log(bitmaps, indent=2)
47    else:
48        log('No bitmap in JSON format output')
49
50
51def add_bitmap(bitmap_number, persistent, disabled):
52    granularity = 1 << (13 + bitmap_number)
53    bitmap_name = 'bitmap-' + str(bitmap_number-1)
54    vm = iotests.VM().add_drive(disk)
55    vm.launch()
56    vm.qmp_log('block-dirty-bitmap-add', node='drive0', name=bitmap_name,
57               granularity=granularity, persistent=persistent,
58               disabled=disabled)
59    vm.shutdown()
60
61
62def write_to_disk(offset, size):
63    write = 'write {} {}'.format(offset, size)
64    log(qemu_io('-c', write, disk), filters=[filter_qemu_io])
65
66
67def toggle_flag(offset):
68    with open(disk, "r+b") as f:
69        f.seek(offset, 0)
70        # Read one byte in a way compatible with Python 2
71        flags = struct.unpack("B", f.read(1))
72        toggled = flags[0] ^ bitmap_flag_unknown
73        f.seek(-1, 1)
74        f.write(struct.pack("B", toggled))
75
76
77qemu_img_create('-f', iotests.imgfmt, disk, '1M')
78
79for num in range(1, 4):
80    disabled = False
81    if num == 2:
82        disabled = True
83    log('Test {}'.format(num))
84    add_bitmap(num, num > 1, disabled)
85    write_to_disk((num-1) * chunk, chunk)
86    print_bitmap([])
87    log('')
88
89vm = iotests.VM().add_drive(disk)
90vm.launch()
91num += 1
92log('Test {}\nChecking "in-use" flag...'.format(num))
93print_bitmap(['--force-share'])
94vm.shutdown()
95
96num += 1
97log('\nTest {}'.format(num))
98qemu_img_create('-f', iotests.imgfmt, disk, '1M')
99add_bitmap(1, True, False)
100log('Write an unknown bitmap flag \'{}\' into a new QCOW2 image at offset {}'
101    .format(hex(bitmap_flag_unknown), flag_offset))
102toggle_flag(flag_offset)
103img_info_log(disk)
104toggle_flag(flag_offset)
105log('Unset the unknown bitmap flag \'{}\' in the bitmap directory entry:\n'
106    .format(hex(bitmap_flag_unknown)))
107img_info_log(disk)
108log('Test complete')
109