iotests: simple mirror test with kvm on 1G image

#!/usr/bin/env python

#

# Simple mirror test

#

# Copyright (c) 2018 Virtuozzo International GmbH. All rights reserved.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

#

import sys

import os

import iotests

from iotests import qemu_img_create, qemu_io, file_path, log

sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'scripts'))

from qemu import QEMUMachine

# Note:

# This test was added to check that mirror dead-lock was fixed (see previous

# commit before this test addition).

# And it didn't reproduce if at least one of the following:

# 1. use small image size

# 2. use raw format (not qcow2)

# 3. drop kvm and use iotests.VM() (maybe, because of qtest) (however, it still

#    reproduces, if just drop kvm, but gdb failed to produce full backtraces

#    for me)

# 4. add iothread

size = 1 * 1024 * 1024 * 1024

iotests.verify_image_format(supported_fmts=['qcow2'])

disk = file_path('disk')

# prepare source image

qemu_img_create('-f', iotests.imgfmt, '-o', 'preallocation=metadata', disk,

                str(size))

vm = QEMUMachine(iotests.qemu_prog)

vm.add_args('-machine', 'pc,accel=kvm')

vm.add_args('-drive', 'id=src,file=' + disk)

vm.launch()

log(vm.qmp('object-add', qom_type='throttle-group', id='tg0',

           props={ 'x-bps-total': size }))

log(vm.qmp('blockdev-add',

           **{ 'node-name': 'target',

               'driver': 'throttle',

               'throttle-group': 'tg0',

               'file': {

                   'driver': 'null-co',

                   'size': size

                } }))

log(vm.qmp('blockdev-mirror', device='src', target='target', sync='full'))

try:

    vm.event_wait('BLOCK_JOB_READY', timeout=10.0)

except:

    vm.shutdown()

    raise

vm.shutdown()

{"return": {}}

{"return": {}}

{"return": {}}

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