166 lines
6.2 KiB
Python
166 lines
6.2 KiB
Python
# Copyright 2011 OpenStack Foundation
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# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Volume drivers for libvirt."""
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from oslo_config import cfg
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from oslo_log import log as logging
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import six
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from nova import exception
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from nova.i18n import _LE
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from nova.i18n import _LW
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from nova.virt.libvirt import config as vconfig
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import nova.virt.libvirt.driver
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from nova.virt.libvirt import host
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from nova.virt.libvirt import utils as libvirt_utils
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LOG = logging.getLogger(__name__)
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volume_opts = [
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cfg.ListOpt('qemu_allowed_storage_drivers',
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default=[],
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help='Protocols listed here will be accessed directly '
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'from QEMU. Currently supported protocols: [gluster]'),
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]
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CONF = cfg.CONF
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CONF.register_opts(volume_opts, 'libvirt')
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SHOULD_LOG_DISCARD_WARNING = True
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class LibvirtBaseVolumeDriver(object):
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"""Base class for volume drivers."""
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def __init__(self, connection, is_block_dev):
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self.connection = connection
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self.is_block_dev = is_block_dev
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def get_config(self, connection_info, disk_info):
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"""Returns xml for libvirt."""
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conf = vconfig.LibvirtConfigGuestDisk()
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conf.driver_name = libvirt_utils.pick_disk_driver_name(
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self.connection._host.get_version(),
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self.is_block_dev
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)
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conf.source_device = disk_info['type']
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conf.driver_format = "raw"
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conf.driver_cache = "none"
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conf.target_dev = disk_info['dev']
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conf.target_bus = disk_info['bus']
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conf.serial = connection_info.get('serial')
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# Support for block size tuning
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data = {}
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if 'data' in connection_info:
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data = connection_info['data']
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if 'logical_block_size' in data:
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conf.logical_block_size = data['logical_block_size']
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if 'physical_block_size' in data:
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conf.physical_block_size = data['physical_block_size']
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# Extract rate_limit control parameters
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if 'qos_specs' in data and data['qos_specs']:
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tune_opts = ['total_bytes_sec', 'read_bytes_sec',
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'write_bytes_sec', 'total_iops_sec',
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'read_iops_sec', 'write_iops_sec']
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specs = data['qos_specs']
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if isinstance(specs, dict):
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for k, v in six.iteritems(specs):
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if k in tune_opts:
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new_key = 'disk_' + k
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setattr(conf, new_key, v)
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else:
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LOG.warning(_LW('Unknown content in connection_info/'
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'qos_specs: %s'), specs)
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# Extract access_mode control parameters
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if 'access_mode' in data and data['access_mode']:
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access_mode = data['access_mode']
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if access_mode in ('ro', 'rw'):
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conf.readonly = access_mode == 'ro'
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else:
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LOG.error(_LE('Unknown content in '
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'connection_info/access_mode: %s'),
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access_mode)
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raise exception.InvalidVolumeAccessMode(
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access_mode=access_mode)
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# Configure usage of discard
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if data.get('discard', False) is True:
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min_qemu = nova.virt.libvirt.driver.MIN_QEMU_DISCARD_VERSION
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min_libvirt = nova.virt.libvirt.driver.MIN_LIBVIRT_DISCARD_VERSION
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if self.connection._host.has_min_version(min_libvirt,
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min_qemu,
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host.HV_DRIVER_QEMU):
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conf.driver_discard = 'unmap'
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else:
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global SHOULD_LOG_DISCARD_WARNING
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if SHOULD_LOG_DISCARD_WARNING:
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SHOULD_LOG_DISCARD_WARNING = False
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LOG.warning(_LW('Unable to attach %(type)s volume '
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'%(serial)s with discard enabled: qemu '
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'%(qemu)s and libvirt %(libvirt)s or '
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'later are required.'),
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{
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'qemu': min_qemu,
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'libvirt': min_libvirt,
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'serial': conf.serial,
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'type': connection_info['driver_volume_type']
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})
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return conf
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def connect_volume(self, connection_info, disk_info):
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"""Connect the volume."""
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pass
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def disconnect_volume(self, connection_info, disk_dev):
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"""Disconnect the volume."""
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pass
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class LibvirtVolumeDriver(LibvirtBaseVolumeDriver):
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"""Class for volumes backed by local file."""
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def __init__(self, connection):
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super(LibvirtVolumeDriver,
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self).__init__(connection, is_block_dev=True)
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def get_config(self, connection_info, disk_info):
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"""Returns xml for libvirt."""
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conf = super(LibvirtVolumeDriver,
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self).get_config(connection_info, disk_info)
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conf.source_type = "block"
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conf.source_path = connection_info['data']['device_path']
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return conf
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class LibvirtFakeVolumeDriver(LibvirtBaseVolumeDriver):
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"""Driver to attach fake volumes to libvirt."""
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def __init__(self, connection):
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super(LibvirtFakeVolumeDriver,
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self).__init__(connection, is_block_dev=True)
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def get_config(self, connection_info, disk_info):
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"""Returns xml for libvirt."""
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conf = super(LibvirtFakeVolumeDriver,
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self).get_config(connection_info, disk_info)
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conf.source_type = "network"
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conf.source_protocol = "fake"
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conf.source_name = "fake"
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return conf
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