66 lines
2.7 KiB
Python
66 lines
2.7 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import copy
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from ironic_lib import utils as il_utils
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from ironic_python_agent import errors
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def get_block_devices_for_raid(block_devices, logical_disks):
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"""Get block devices that are involved in the RAID configuration.
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This call does two things:
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* Collect all block devices that are involved in RAID.
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* Update each logical disks with suitable block devices.
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"""
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serialized_devs = [dev.serialize() for dev in block_devices]
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# NOTE(dtantsur): we're going to modify the structure, so make a copy
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logical_disks = copy.deepcopy(logical_disks)
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# NOTE(dtantsur): using a list here is less efficient than a set, but
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# allows keeping the original ordering.
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result = []
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for logical_disk in logical_disks:
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if logical_disk.get('physical_disks'):
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matching = []
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for phys_disk in logical_disk['physical_disks']:
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candidates = [
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dev['name'] for dev in il_utils.find_devices_by_hints(
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serialized_devs, phys_disk)
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]
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if not candidates:
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raise errors.SoftwareRAIDError(
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"No candidates for physical disk %(hints)s "
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"from the list %(devices)s"
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% {'hints': phys_disk, 'devices': serialized_devs})
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try:
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matching.append(next(x for x in candidates
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if x not in matching))
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except StopIteration:
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raise errors.SoftwareRAIDError(
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"No candidates left for physical disk %(hints)s "
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"from the list %(candidates)s after picking "
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"%(matching)s for previous volumes"
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% {'hints': phys_disk, 'matching': matching,
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'candidates': candidates})
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else:
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# This RAID device spans all disks.
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matching = [dev.name for dev in block_devices]
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# Update the result keeping the ordering and avoiding duplicates.
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result.extend(disk for disk in matching if disk not in result)
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logical_disk['block_devices'] = matching
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return result, logical_disks
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