60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
# 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 manila.i18n import _LE
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from manila.i18n import _LW
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from manila.openstack.common import log as logging
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from manila.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 host_state.free_capacity_gb is None:
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# Fail Safe
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LOG.error(_LE("Free capacity not set: "
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"volume node info collection broken."))
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return False
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free_space = host_state.free_capacity_gb
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if free_space == 'infinite' or free_space == 'unknown':
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# NOTE(zhiteng) for those back-ends cannot report actual
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# available capacity, we assume it is able to serve the
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# request. Even if it was not, the retry mechanism is
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# able to handle the failure by rescheduling
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return True
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reserved = float(host_state.reserved_percentage) / 100
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free = math.floor(free_space * (1 - reserved))
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if free < volume_size:
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LOG.warning(_LW("Insufficient free space for volume creation "
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"(requested / avail): "
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"%(requested)s/%(available)s"),
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{'requested': volume_size,
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'available': free})
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return free >= volume_size
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