**** CubicPower OpenStack Study ****
# Copyright (c) 2012 Intel
# Copyright (c) 2012 OpenStack Foundation
#
# 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.
import math
from cinder.openstack.common import log as logging
from cinder.openstack.common.scheduler import filters
LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study ****
class CapacityFilter(filters.BaseHostFilter):
"""CapacityFilter filters based on volume host's capacity utilization."""
**** CubicPower OpenStack Study ****
def host_passes(self, host_state, filter_properties):
"""Return True if host has sufficient capacity."""
# If the volume already exists on this host, don't fail it for
# insufficient capacity (e.g., if we are retyping)
if host_state.host == filter_properties.get('vol_exists_on'):
return True
volume_size = filter_properties.get('size')
if host_state.free_capacity_gb is None:
# Fail Safe
LOG.error(_("Free capacity not set: "
"volume node info collection broken."))
return False
free_space = host_state.free_capacity_gb
if free_space == 'infinite' or free_space == 'unknown':
# NOTE(zhiteng) for those back-ends cannot report actual
# available capacity, we assume it is able to serve the
# request. Even if it was not, the retry mechanism is
# able to handle the failure by rescheduling
return True
reserved = float(host_state.reserved_percentage) / 100
free = math.floor(free_space * (1 - reserved))
if free < volume_size:
LOG.warning(_("Insufficient free space for volume creation "
"(requested / avail): "
"%(requested)s/%(available)s")
% {'requested': volume_size,
'available': free})
return free >= volume_size