251 lines
9.7 KiB
Python
251 lines
9.7 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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import re
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from ironic_lib import utils as il_utils
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from oslo_concurrency import processutils
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from oslo_log import log as logging
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from ironic_python_agent import errors
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from ironic_python_agent import utils
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LOG = logging.getLogger(__name__)
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# NOTE(dtantsur): 550 MiB is used by DIB and seems a common guidance:
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# https://www.rodsbooks.com/efi-bootloaders/principles.html
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ESP_SIZE_MIB = 550
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# NOTE(rpittau) The partition number used to create a raid device.
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# Could be changed to variable if we ever decide, for example to create
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# some additional partitions (e.g. boot partitions), so md0 is on the
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# partition 1, md1 on the partition 2, and so on.
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RAID_PARTITION = 1
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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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def calculate_raid_start(target_boot_mode, partition_table_type, dev_name):
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"""Define the start sector for the raid partition.
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:param target_boot_mode: the node boot mode.
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:param partition_table_type: the node partition label, gpt or msdos.
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:param dev_name: block device in the raid configuration.
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:return: The start sector for the raid partition.
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"""
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# TODO(rg): TBD, several options regarding boot part slots here:
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# 1. Create boot partitions in prevision
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# 2. Just leave space
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# 3. Do nothing: rely on the caller to specify target_raid_config
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# correctly according to what they intend to do (e.g. not set MAX
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# if they know they will need some space for bios boot or efi
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# parts). Best option imo, if we accept that the target volume
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# granularity is GiB, so you lose up to 1GiB just for a bios boot
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# partition...
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if target_boot_mode == 'uefi':
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# Leave 551MiB - start_sector s for the esp (approx 550 MiB)
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# TODO(dtantsur): 550 MiB is a waste in most cases, make it
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# configurable?
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raid_start = '%sMiB' % (ESP_SIZE_MIB + 1)
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else:
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if partition_table_type == 'gpt':
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# Leave 8MiB - start_sector s (approx 7MiB)
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# for the bios boot partition or the ppc prepboot part
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# This should avoid grub errors saying that it cannot
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# install boot stage 1.5/2 (since the mbr gap does not
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# exist on disk holders with gpt tables)
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raid_start = '8MiB'
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else:
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# sgdisk works fine for display data on mbr tables too
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out, _u = utils.execute('sgdisk', '-F', dev_name)
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raid_start = "{}s".format(out.splitlines()[-1])
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return raid_start
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def calc_raid_partition_sectors(psize, start):
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"""Calculates end sector and converts start and end sectors including
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the unit of measure, compatible with parted.
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:param psize: size of the raid partition
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:param start: start sector of the raid partion in integer format
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:return: start and end sector in parted compatible format, end sector
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as integer
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"""
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if isinstance(start, int):
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start_str = '%dGiB' % start
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else:
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start_str = start
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if psize == -1:
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end_str = '-1'
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end = '-1'
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else:
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if isinstance(start, int):
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end = start + psize
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else:
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# First partition case, start is sth like 2048s
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end = psize
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end_str = '%dGiB' % end
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return start_str, end_str, end
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def create_raid_partition_tables(block_devices, partition_table_type,
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target_boot_mode):
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"""Creates partition tables in all disks in a RAID configuration and
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reports the starting sector for each partition on each disk.
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:param block_devices: disks where we want to create the partition tables.
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:param partition_table_type: type of partition table to create, for example
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gpt or msdos.
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:param target_boot_mode: the node selected boot mode, for example uefi
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or bios.
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:return: a dictionary of devices and the start of the corresponding
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partition.
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"""
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parted_start_dict = {}
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for dev_name in block_devices:
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utils.create_partition_table(dev_name, partition_table_type)
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parted_start_dict[dev_name] = calculate_raid_start(
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target_boot_mode, partition_table_type, dev_name)
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return parted_start_dict
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def _get_actual_component_devices(raid_device):
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"""Get the component devices of a Software RAID device.
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Examine an md device and return its constituent devices.
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:param raid_device: A Software RAID block device name.
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:returns: A list of the component devices.
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"""
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if not raid_device:
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return []
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try:
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out, _ = utils.execute('mdadm', '--detail', raid_device,
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use_standard_locale=True)
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except processutils.ProcessExecutionError as e:
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LOG.warning('Could not get component devices of %(dev)s: %(err)s',
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{'dev': raid_device, 'err': e})
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return []
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component_devices = []
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lines = out.splitlines()
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# the first line contains the md device itself
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for line in lines[1:]:
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device = re.findall(r'/dev/\w+', line)
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component_devices += device
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return component_devices
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def create_raid_device(index, logical_disk):
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"""Create a raid device.
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:param index: the index of the resulting md device.
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:param logical_disk: the logical disk containing the devices used to
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crete the raid.
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:raise: errors.SoftwareRAIDError if not able to create the raid device
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or fails to re-add a device to a raid.
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"""
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md_device = '/dev/md%d' % index
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component_devices = []
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for device in logical_disk['block_devices']:
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# The partition delimiter for all common harddrives (sd[a-z]+)
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part_delimiter = ''
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if 'nvme' in device:
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part_delimiter = 'p'
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component_devices.append(
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device + part_delimiter + str(index + RAID_PARTITION))
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raid_level = logical_disk['raid_level']
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# The schema check allows '1+0', but mdadm knows it as '10'.
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if raid_level == '1+0':
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raid_level = '10'
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try:
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LOG.debug("Creating md device %(dev)s on %(comp)s",
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{'dev': md_device, 'comp': component_devices})
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utils.execute('mdadm', '--create', md_device, '--force',
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'--run', '--metadata=1', '--level', raid_level,
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'--raid-devices', len(component_devices),
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*component_devices)
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except processutils.ProcessExecutionError as e:
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msg = "Failed to create md device {} on {}: {}".format(
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md_device, ' '.join(component_devices), e)
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raise errors.SoftwareRAIDError(msg)
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# check for missing devices and re-add them
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actual_components = _get_actual_component_devices(md_device)
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missing = set(component_devices) - set(actual_components)
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for dev in missing:
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try:
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LOG.warning('Found %(device)s to be missing from %(md)s '
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'... re-adding!',
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{'device': dev, 'md': md_device})
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utils.execute('mdadm', '--add', md_device, dev,
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attempts=3, delay_on_retry=True)
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except processutils.ProcessExecutionError as e:
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msg = "Failed re-add {} to {}: {}".format(
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dev, md_device, e)
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raise errors.SoftwareRAIDError(msg)
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