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Viewing changes to cinder/scheduler/filters/capacity_filter.py

Tags: upstream-2013.1~g2
Import upstream version 2013.1~g2

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cinder/scheduler/filters/capacity_filter.py
 
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# Copyright (c) 2012 Intel
 
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# Copyright (c) 2012 OpenStack, LLC.
 
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#
 
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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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import math
 
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from cinder.openstack.common import log as logging
 
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from cinder.openstack.common.scheduler import filters
 
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LOG = logging.getLogger(__name__)
 
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class CapacityFilter(filters.BaseHostFilter):
 
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    """CapacityFilter filters based on volume host's capacity utilization."""
 
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    def host_passes(self, host_state, filter_properties):
 
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        """Return True if host has sufficient capacity."""
 
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        volume_size = filter_properties.get('size')
 
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        if not host_state.free_capacity_gb:
 
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            # Fail Safe
 
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            LOG.warning(_("Free capacity not set;"
 
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                          "volume node info collection broken."))
 
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            return False
 
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        reserved = float(host_state.reserved_percentage) / 100
 
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        free = math.floor(host_state.free_capacity_gb * (1 - reserved))
 
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        return free >= volume_size