55 lines
2.0 KiB
Python
55 lines
2.0 KiB
Python
# Copyright (c) 2015 Alex Meade
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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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from oslo_log import log
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from manila.scheduler.filters import base_host
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from manila.share import utils as share_utils
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LOG = log.getLogger(__name__)
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class ConsistencyGroupFilter(base_host.BaseHostFilter):
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"""ConsistencyGroupFilter filters host based on compatibility with CG."""
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def host_passes(self, host_state, filter_properties):
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"""Return True if host will work with desired consistency group."""
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cg = filter_properties.get('consistency_group')
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cg_support = filter_properties.get('cg_support')
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# NOTE(ameade): If creating a share not in a CG, then of course the
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# host is valid for the cg.
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if not cg:
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return True
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# NOTE(ameade): If the CG host can only support shares on the same
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# pool, then the only valid pool is that one.
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if cg_support == 'pool' and cg.get('host') == host_state.host:
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return True
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# NOTE(ameade): If the CG host can support shares on the same host,
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# then any pool on that backend will work.
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elif cg_support == 'host':
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cg_backend = share_utils.extract_host(cg['host'])
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host_backend = share_utils.extract_host(host_state.host)
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return cg_backend == host_backend
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LOG.debug("Host %(host)s is not compatible with consistency "
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"group %(cg)s"
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% {"host": host_state.host, "cg": cg['id']})
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return False
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