tests/qemu-iotests/242

   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
  21 import iotests
  22 import json
  23 import struct
  24 from iotests import qemu_img_create, qemu_io, qemu_img_pipe, \
  25     file_path, img_info_log, log, filter_qemu_io
  26
  27 iotests.verify_image_format(supported_fmts=['qcow2'])
  28
  29 disk = file_path('disk')
  30 chunk = 256 * 1024
  31 bitmap_flag_unknown = 1 << 2
  32 # flag_offset = 5*cluster_size + flag_offset_in_bitmap_directory_entry
  33 flag_offset = 0x5000f
  34
  35
  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)
  45     else:
  46         log('No bitmap in JSON format output')
  47
  48
  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)
  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
  60 def write_to_disk(offset, size):
  61     write = 'write {} {}'.format(offset, size)
  62     log(qemu_io('-c', write, disk), filters=[filter_qemu_io])
  63
  64
  65 def 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
  75 qemu_img_create('-f', iotests.imgfmt, disk, '1M')
  76
  77 for 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
  87 vm = iotests.VM().add_drive(disk)
  88 vm.launch()
  89 num += 1
  90 log('Test {}\nChecking "in-use" flag...'.format(num))
  91 print_bitmap(['--force-share'])
  92 vm.shutdown()
  93
  94 num += 1
  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)
 101 img_info_log(disk)
 102 toggle_flag(flag_offset)
 103 log('Unset the unknown bitmap flag \'{}\' in the bitmap directory entry:\n'
 104     .format(hex(bitmap_flag_unknown)))
 105 img_info_log(disk)
 106 log('Test complete')