093a13acbf
This makes these callsites a little simpler, but the real motivation is a forthcoming commit will change the return type of qemu_io(), so removing users of the return value now is helpful. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Hanna Reitz <hreitz@redhat.com> Message-Id: <20220418211504.943969-2-jsnow@redhat.com> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
109 lines
3.3 KiB
Python
Executable File
109 lines
3.3 KiB
Python
Executable File
#!/usr/bin/env python3
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# group: rw quick
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#
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# Test for qcow2 bitmap printed information
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#
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# Copyright (c) 2019 Virtuozzo International GmbH
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import iotests
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import json
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import struct
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from iotests import qemu_img_create, qemu_io_log, qemu_img_info, \
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file_path, img_info_log, log
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iotests.script_initialize(supported_fmts=['qcow2'],
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supported_protocols=['file'],
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unsupported_imgopts=['refcount_bits', 'compat'])
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disk = file_path('disk')
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chunk = 256 * 1024
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bitmap_flag_unknown = 1 << 2
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# flag_offset = 5*cluster_size + flag_offset_in_bitmap_directory_entry
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flag_offset = 0x5000f
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def print_bitmap(extra_args):
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log('qemu-img info dump:\n')
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img_info_log(disk, extra_args=extra_args)
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result = qemu_img_info('--force-share', disk)
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if 'bitmaps' in result['format-specific']['data']:
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bitmaps = result['format-specific']['data']['bitmaps']
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log('The same bitmaps in JSON format:')
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log(bitmaps, indent=2)
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else:
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log('No bitmap in JSON format output')
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def add_bitmap(bitmap_number, persistent, disabled):
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granularity = 1 << (13 + bitmap_number)
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bitmap_name = 'bitmap-' + str(bitmap_number-1)
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vm = iotests.VM().add_drive(disk)
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vm.launch()
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vm.qmp_log('block-dirty-bitmap-add', node='drive0', name=bitmap_name,
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granularity=granularity, persistent=persistent,
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disabled=disabled)
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vm.shutdown()
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def write_to_disk(offset, size):
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write = 'write {} {}'.format(offset, size)
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qemu_io_log('-c', write, disk)
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def toggle_flag(offset):
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with open(disk, "r+b") as f:
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f.seek(offset, 0)
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# Read one byte in a way compatible with Python 2
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flags = struct.unpack("B", f.read(1))
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toggled = flags[0] ^ bitmap_flag_unknown
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f.seek(-1, 1)
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f.write(struct.pack("B", toggled))
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qemu_img_create('-f', iotests.imgfmt, disk, '1M')
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for num in range(1, 4):
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disabled = False
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if num == 2:
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disabled = True
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log('Test {}'.format(num))
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add_bitmap(num, num > 1, disabled)
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write_to_disk((num-1) * chunk, chunk)
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print_bitmap([])
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log('')
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vm = iotests.VM().add_drive(disk)
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vm.launch()
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num += 1
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log('Test {}\nChecking "in-use" flag...'.format(num))
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print_bitmap(['--force-share'])
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vm.shutdown()
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num += 1
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log('\nTest {}'.format(num))
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qemu_img_create('-f', iotests.imgfmt, disk, '1M')
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add_bitmap(1, True, False)
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log('Write an unknown bitmap flag \'{}\' into a new QCOW2 image at offset {}'
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.format(hex(bitmap_flag_unknown), flag_offset))
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toggle_flag(flag_offset)
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img_info_log(disk, check=False)
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toggle_flag(flag_offset)
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log('Unset the unknown bitmap flag \'{}\' in the bitmap directory entry:\n'
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.format(hex(bitmap_flag_unknown)))
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img_info_log(disk)
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log('Test complete')
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