tests/qemu-iotests/242

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