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# Copyright 2011 OpenStack Foundation
# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Volume drivers for libvirt."""
from oslo_log import log as logging
import nova.conf
from nova import exception
from nova import profiler
from nova.virt.libvirt import config as vconfig
import nova.virt.libvirt.driver
from nova.virt.libvirt import utils as libvirt_utils
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
@profiler.trace_cls("volume_api")
class LibvirtBaseVolumeDriver(object):
"""Base class for volume drivers."""
def __init__(self, host, is_block_dev):
self.host = host
self.is_block_dev = is_block_dev
def get_config(self, connection_info, disk_info):
"""Returns xml for libvirt."""
conf = vconfig.LibvirtConfigGuestDisk()
conf.driver_name = libvirt_utils.pick_disk_driver_name(
self.host.get_version(),
self.is_block_dev
)
conf.source_device = disk_info['type']
conf.driver_format = "raw"
conf.driver_cache = "none"
conf.target_dev = disk_info['dev']
conf.target_bus = disk_info['bus']
conf.serial = connection_info.get('serial')
# Support for block size tuning
data = {}
if 'data' in connection_info:
data = connection_info['data']
if 'logical_block_size' in data:
conf.logical_block_size = data['logical_block_size']
if 'physical_block_size' in data:
conf.physical_block_size = data['physical_block_size']
# Extract rate_limit control parameters
if 'qos_specs' in data and data['qos_specs']:
tune_opts = ['total_bytes_sec', 'read_bytes_sec',
'write_bytes_sec', 'total_iops_sec',
'read_iops_sec', 'write_iops_sec']
specs = data['qos_specs']
if isinstance(specs, dict):
for k, v in specs.items():
if k in tune_opts:
new_key = 'disk_' + k
setattr(conf, new_key, v)
else:
LOG.warning('Unknown content in connection_info/'
'qos_specs: %s', specs)
# Extract access_mode control parameters
if 'access_mode' in data and data['access_mode']:
access_mode = data['access_mode']
if access_mode in ('ro', 'rw'):
conf.readonly = access_mode == 'ro'
else:
LOG.error('Unknown content in '
'connection_info/access_mode: %s',
access_mode)
raise exception.InvalidVolumeAccessMode(
access_mode=access_mode)
# Configure usage of discard
if data.get('discard', False) is True:
conf.driver_discard = 'unmap'
# NOTE(melwitt): We set the device address unit number manually in the
# case of the virtio-scsi controller, in order to allow attachment of
# up to 256 devices. So, we should only be setting the address tag
# if we intend to set the unit number. Otherwise, we will let libvirt
# handle autogeneration of the address tag.
# See https://bugs.launchpad.net/nova/+bug/1792077 for details.
if disk_info['bus'] == 'scsi' and 'unit' in disk_info:
# The driver is responsible to create the SCSI controller
# at index 0.
conf.device_addr = vconfig.LibvirtConfigGuestDeviceAddressDrive()
conf.device_addr.controller = 0
# In order to allow up to 256 disks handled by one
# virtio-scsi controller, the device addr should be
# specified.
conf.device_addr.unit = disk_info['unit']
return conf
def connect_volume(self, connection_info, disk_info, instance):
"""Connect the volume."""
pass
def disconnect_volume(self, connection_info, disk_dev, instance):
"""Disconnect the volume."""
pass
def extend_volume(self, connection_info, instance):
"""Extend the volume."""
raise NotImplementedError()
class LibvirtVolumeDriver(LibvirtBaseVolumeDriver):
"""Class for volumes backed by local file."""
def __init__(self, host):
super(LibvirtVolumeDriver,
self).__init__(host, is_block_dev=True)
def get_config(self, connection_info, disk_info):
"""Returns xml for libvirt."""
conf = super(LibvirtVolumeDriver,
self).get_config(connection_info, disk_info)
conf.source_type = "block"
conf.source_path = connection_info['data']['device_path']
return conf
class LibvirtFakeVolumeDriver(LibvirtBaseVolumeDriver):
"""Driver to attach fake volumes to libvirt."""
def __init__(self, host):
super(LibvirtFakeVolumeDriver,
self).__init__(host, is_block_dev=True)
def get_config(self, connection_info, disk_info):
"""Returns xml for libvirt."""
conf = super(LibvirtFakeVolumeDriver,
self).get_config(connection_info, disk_info)
conf.source_type = "network"
conf.source_protocol = "fake"
conf.source_name = "fake"
return conf
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