3 # Test for qcow2 bitmap printed information
5 # Copyright (c) 2019 Virtuozzo International GmbH
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.
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.
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/>.
24 from iotests import qemu_img_create, qemu_io, qemu_img_pipe, \
25 file_path, img_info_log, log, filter_qemu_io
27 iotests.script_initialize(supported_fmts=['qcow2'])
29 disk = file_path('disk')
31 bitmap_flag_unknown = 1 << 2
32 # flag_offset = 5*cluster_size + flag_offset_in_bitmap_directory_entry
36 def 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)
46 log('No bitmap in JSON format output')
49 def 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)
54 vm.qmp_log('block-dirty-bitmap-add', node='drive0', name=bitmap_name,
55 granularity=granularity, persistent=persistent,
60 def write_to_disk(offset, size):
61 write = 'write {} {}'.format(offset, size)
62 log(qemu_io('-c', write, disk), filters=[filter_qemu_io])
65 def toggle_flag(offset):
66 with open(disk, "r+b") as f:
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
72 f.write(struct.pack("B", toggled))
75 qemu_img_create('-f', iotests.imgfmt, disk, '1M')
77 for num in range(1, 4):
81 log('Test {}'.format(num))
82 add_bitmap(num, num > 1, disabled)
83 write_to_disk((num-1) * chunk, chunk)
87 vm = iotests.VM().add_drive(disk)
90 log('Test {}\nChecking "in-use" flag...'.format(num))
91 print_bitmap(['--force-share'])
95 log('\nTest {}'.format(num))
96 qemu_img_create('-f', iotests.imgfmt, disk, '1M')
97 add_bitmap(1, True, False)
98 log('Write an unknown bitmap flag \'{}\' into a new QCOW2 image at offset {}'
99 .format(hex(bitmap_flag_unknown), flag_offset))
100 toggle_flag(flag_offset)
102 toggle_flag(flag_offset)
103 log('Unset the unknown bitmap flag \'{}\' in the bitmap directory entry:\n'
104 .format(hex(bitmap_flag_unknown)))