977 lines
41 KiB
Python
977 lines
41 KiB
Python
# Copyright IBM Corp. 2013 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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"""
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GPFS Volume Driver.
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"""
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import math
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import os
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import re
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import shutil
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from oslo.config import cfg
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from cinder import exception
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from cinder.image import image_utils
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from cinder.openstack.common import fileutils
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from cinder.openstack.common import log as logging
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from cinder.openstack.common import processutils
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from cinder import units
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from cinder import utils
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from cinder.volume import driver
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GPFS_CLONE_MIN_RELEASE = 1200
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LOG = logging.getLogger(__name__)
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gpfs_opts = [
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cfg.StrOpt('gpfs_mount_point_base',
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default=None,
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help='Specifies the path of the GPFS directory where Block '
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'Storage volume and snapshot files are stored.'),
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cfg.StrOpt('gpfs_images_dir',
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default=None,
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help='Specifies the path of the Image service repository in '
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'GPFS. Leave undefined if not storing images in GPFS.'),
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cfg.StrOpt('gpfs_images_share_mode',
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default=None,
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help='Specifies the type of image copy to be used. Set this '
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'when the Image service repository also uses GPFS so '
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'that image files can be transferred efficiently from '
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'the Image service to the Block Storage service. There '
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'are two valid values: "copy" specifies that a full copy '
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'of the image is made; "copy_on_write" specifies that '
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'copy-on-write optimization strategy is used and '
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'unmodified blocks of the image file are shared '
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'efficiently.'),
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cfg.IntOpt('gpfs_max_clone_depth',
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default=0,
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help='Specifies an upper limit on the number of indirections '
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'required to reach a specific block due to snapshots or '
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'clones. A lengthy chain of copy-on-write snapshots or '
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'clones can have a negative impact on performance, but '
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'improves space utilization. 0 indicates unlimited '
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'clone depth.'),
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cfg.BoolOpt('gpfs_sparse_volumes',
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default=True,
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help=('Specifies that volumes are created as sparse files '
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'which initially consume no space. If set to False, the '
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'volume is created as a fully allocated file, in which '
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'case, creation may take a significantly longer time.')),
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cfg.StrOpt('gpfs_storage_pool',
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default=None,
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help=('Specifies the storage pool that volumes are assigned '
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'to. By default, the system storage pool is used.')),
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]
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CONF = cfg.CONF
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CONF.register_opts(gpfs_opts)
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def _different(difference_tuple):
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"""Return true if two elements of a tuple are different."""
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if difference_tuple:
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member1, member2 = difference_tuple
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return member1 != member2
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else:
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return False
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def _same_filesystem(path1, path2):
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"""Return true if the two paths are in the same GPFS file system."""
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return os.lstat(path1).st_dev == os.lstat(path2).st_dev
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def _sizestr(size_in_g):
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"""Convert the specified size into a string value."""
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if int(size_in_g) == 0:
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# return 100M size on zero input for testing
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return '100M'
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return '%sG' % size_in_g
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class GPFSDriver(driver.VolumeDriver):
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"""Implements volume functions using GPFS primitives.
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Version history:
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1.0.0 - Initial driver
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1.1.0 - Add volume retype, refactor volume migration
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"""
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VERSION = "1.1.0"
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def __init__(self, *args, **kwargs):
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super(GPFSDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(gpfs_opts)
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def _get_gpfs_state(self):
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"""Return GPFS state information."""
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try:
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(out, _) = self._execute('mmgetstate', '-Y', run_as_root=True)
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return out
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except processutils.ProcessExecutionError as exc:
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LOG.error(_('Failed to issue mmgetstate command, error: %s.') %
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exc.stderr)
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raise exception.VolumeBackendAPIException(data=exc.stderr)
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def _check_gpfs_state(self):
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"""Raise VolumeBackendAPIException if GPFS is not active."""
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out = self._get_gpfs_state()
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lines = out.splitlines()
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state_token = lines[0].split(':').index('state')
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gpfs_state = lines[1].split(':')[state_token]
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if gpfs_state != 'active':
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LOG.error(_('GPFS is not active. Detailed output: %s.') % out)
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exception_message = (_('GPFS is not running, state: %s.') %
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gpfs_state)
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raise exception.VolumeBackendAPIException(data=exception_message)
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def _get_filesystem_from_path(self, path):
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"""Return filesystem for specified path."""
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try:
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(out, _) = self._execute('df', path, run_as_root=True)
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lines = out.splitlines()
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filesystem = lines[1].split()[0]
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return filesystem
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except processutils.ProcessExecutionError as exc:
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LOG.error(_('Failed to issue df command for path %(path)s, '
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'error: %(error)s.') %
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{'path': path,
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'error': exc.stderr})
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raise exception.VolumeBackendAPIException(data=exc.stderr)
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def _get_gpfs_cluster_id(self):
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"""Return the id for GPFS cluster being used."""
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try:
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(out, _) = self._execute('mmlsconfig', 'clusterId', '-Y',
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run_as_root=True)
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lines = out.splitlines()
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value_token = lines[0].split(':').index('value')
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cluster_id = lines[1].split(':')[value_token]
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return cluster_id
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except processutils.ProcessExecutionError as exc:
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LOG.error(_('Failed to issue mmlsconfig command, error: %s.') %
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exc.stderr)
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raise exception.VolumeBackendAPIException(data=exc.stderr)
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def _get_fileset_from_path(self, path):
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"""Return the GPFS fileset for specified path."""
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fs_regex = re.compile(r'.*fileset.name:\s+(?P<fileset>\w+)', re.S)
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try:
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(out, _) = self._execute('mmlsattr', '-L', path, run_as_root=True)
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except processutils.ProcessExecutionError as exc:
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LOG.error(_('Failed to issue mmlsattr command on path %(path)s, '
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'error: %(error)') %
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{'path': path,
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'error': exc.stderr})
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raise exception.VolumeBackendAPIException(data=exc.stderr)
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try:
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fileset = fs_regex.match(out).group('fileset')
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return fileset
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except AttributeError as exc:
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LOG.error(_('Failed to find fileset for path %(path)s, error: '
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'%(error)s.') %
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{'path': path,
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'error': exc.stderr})
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raise exception.VolumeBackendAPIException(data=exc.stderr)
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def _verify_gpfs_pool(self, storage_pool):
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"""Return true if the specified pool is a valid GPFS storage pool."""
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try:
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self._execute('mmlspool', self._gpfs_device, storage_pool,
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run_as_root=True)
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return True
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except processutils.ProcessExecutionError:
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return False
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def _update_volume_storage_pool(self, local_path, new_pool):
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"""Set the storage pool for a volume to the specified value."""
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if new_pool is None:
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new_pool = 'system'
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if not self._verify_gpfs_pool(new_pool):
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msg = (_('Invalid storage pool %s requested. Retype failed.') %
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new_pool)
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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try:
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self._execute('mmchattr', '-P', new_pool, local_path,
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run_as_root=True)
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LOG.debug('Updated storage pool with mmchattr to %s.' % new_pool)
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return True
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except processutils.ProcessExecutionError as exc:
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LOG.info('Could not update storage pool with mmchattr to '
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'%(pool)s, error: %(error)s' %
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{'pool': new_pool,
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'error': exc.stderr})
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return False
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def _get_gpfs_fs_release_level(self, path):
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"""Return the GPFS version of the specified file system.
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The file system is specified by any valid path it contains.
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"""
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filesystem = self._get_filesystem_from_path(path)
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try:
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(out, _) = self._execute('mmlsfs', filesystem, '-V', '-Y',
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run_as_root=True)
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except processutils.ProcessExecutionError as exc:
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LOG.error(_('Failed to issue mmlsfs command for path %(path), '
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'error: %(error)s.') %
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{'path': path,
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'error': exc.stderr})
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raise exception.VolumeBackendAPIException(data=exc.stderr)
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lines = out.splitlines()
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value_token = lines[0].split(':').index('data')
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fs_release_level_str = lines[1].split(':')[value_token]
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# at this point, release string looks like "13.23 (3.5.0.7)"
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# extract first token and convert to whole number value
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fs_release_level = int(float(fs_release_level_str.split()[0]) * 100)
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return filesystem, fs_release_level
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def _get_gpfs_cluster_release_level(self):
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"""Return the GPFS version of current cluster."""
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try:
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(out, _) = self._execute('mmlsconfig', 'minreleaseLeveldaemon',
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'-Y', run_as_root=True)
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except processutils.ProcessExecutionError as exc:
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LOG.error(_('Failed to issue mmlsconfig command, error: %s.') %
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exc.stderr)
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raise exception.VolumeBackendAPIException(data=exc.stderr)
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lines = out.splitlines()
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value_token = lines[0].split(':').index('value')
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min_release_level = lines[1].split(':')[value_token]
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return int(min_release_level)
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def _is_gpfs_path(self, directory):
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"""Determine if the specified path is in a gpfs file system.
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If not part of a gpfs file system, raise ProcessExecutionError.
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"""
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try:
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self._execute('mmlsattr', directory, run_as_root=True)
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except processutils.ProcessExecutionError as exc:
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LOG.error(_('Failed to issue mmlsattr command for path %(path), '
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'error: %(error)s.') %
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{'path': directory,
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'error': exc.stderr})
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raise exception.VolumeBackendAPIException(data=exc.stderr)
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def _is_same_fileset(self, path1, path2):
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"""Return true if the two paths are in the same GPFS fileset."""
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if self._get_fileset_from_path(path1) == \
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self._get_fileset_from_path(path2):
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return True
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return False
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def _same_cluster(self, host):
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"""Return true if the host is a member of the same GPFS cluster."""
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dest_location = host['capabilities'].get('location_info')
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if self._stats['location_info'] == dest_location:
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return True
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return False
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def _set_rw_permission(self, path, modebits='660'):
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"""Set permission bits for the path."""
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self._execute('chmod', modebits, path, run_as_root=True)
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def _can_migrate_locally(self, host):
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"""Return true if the host can migrate a volume locally."""
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if 'location_info' not in host['capabilities']:
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LOG.debug('Evaluate migration: no location info, '
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'cannot migrate locally.')
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return None
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info = host['capabilities']['location_info']
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try:
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(dest_type, dest_id, dest_path) = info.split(':')
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except ValueError:
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LOG.debug('Evaluate migration: unexpected location info, '
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'cannot migrate locally: %s.' % info)
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return None
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if dest_type != 'GPFSDriver' or dest_id != self._cluster_id:
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LOG.debug('Evaluate migration: different destination driver or '
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'cluster id in location info: %s.' % info)
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return None
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LOG.debug('Evaluate migration: use local migration.')
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return dest_path
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def do_setup(self, ctxt):
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"""Determine storage back end capabilities."""
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try:
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self._cluster_id = self._get_gpfs_cluster_id()
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except Exception as setup_exception:
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msg = (_('Could not find GPFS cluster id: %s.') %
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setup_exception)
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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try:
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gpfs_base = self.configuration.gpfs_mount_point_base
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self._gpfs_device = self._get_filesystem_from_path(gpfs_base)
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except Exception as setup_exception:
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msg = (_('Could not find GPFS file system device: %s.') %
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setup_exception)
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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pool = self.configuration.safe_get('gpfs_storage_pool')
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self._storage_pool = pool or 'system'
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if not self._verify_gpfs_pool(self._storage_pool):
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msg = (_('Invalid storage pool %s specificed.') %
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self._storage_pool)
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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def check_for_setup_error(self):
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"""Returns an error if prerequisites aren't met."""
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self._check_gpfs_state()
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if self.configuration.gpfs_mount_point_base is None:
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msg = _('Option gpfs_mount_point_base is not set correctly.')
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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if (self.configuration.gpfs_images_share_mode and
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self.configuration.gpfs_images_share_mode not in ['copy_on_write',
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'copy']):
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msg = _('Option gpfs_images_share_mode is not set correctly.')
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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if(self.configuration.gpfs_images_share_mode and
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self.configuration.gpfs_images_dir is None):
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msg = _('Option gpfs_images_dir is not set correctly.')
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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if(self.configuration.gpfs_images_share_mode == 'copy_on_write' and
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not _same_filesystem(self.configuration.gpfs_mount_point_base,
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self.configuration.gpfs_images_dir)):
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msg = (_('gpfs_images_share_mode is set to copy_on_write, but '
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'%(vol)s and %(img)s belong to different file '
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'systems.') %
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{'vol': self.configuration.gpfs_mount_point_base,
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'img': self.configuration.gpfs_images_dir})
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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if(self.configuration.gpfs_images_share_mode == 'copy_on_write' and
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not self._is_same_fileset(self.configuration.gpfs_mount_point_base,
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self.configuration.gpfs_images_dir)):
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msg = (_('gpfs_images_share_mode is set to copy_on_write, but '
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'%(vol)s and %(img)s belong to different filesets.') %
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{'vol': self.configuration.gpfs_mount_point_base,
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'img': self.configuration.gpfs_images_dir})
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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_gpfs_cluster_release_level = self._get_gpfs_cluster_release_level()
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if not _gpfs_cluster_release_level >= GPFS_CLONE_MIN_RELEASE:
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msg = (_('Downlevel GPFS Cluster Detected. GPFS Clone feature '
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'not enabled in cluster daemon level %(cur)s - must '
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'be at least at level %(min)s.') %
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{'cur': _gpfs_cluster_release_level,
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'min': GPFS_CLONE_MIN_RELEASE})
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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for directory in [self.configuration.gpfs_mount_point_base,
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self.configuration.gpfs_images_dir]:
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if directory is None:
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continue
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if not directory.startswith('/'):
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msg = (_('%s must be an absolute path.') % directory)
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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if not os.path.isdir(directory):
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msg = (_('%s is not a directory.') % directory)
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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# Check if GPFS is mounted
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self._verify_gpfs_path_state(directory)
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filesystem, fslevel = \
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self._get_gpfs_fs_release_level(directory)
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if not fslevel >= GPFS_CLONE_MIN_RELEASE:
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msg = (_('The GPFS filesystem %(fs)s is not at the required '
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'release level. Current level is %(cur)s, must be '
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'at least %(min)s.') %
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{'fs': filesystem,
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'cur': fslevel,
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'min': GPFS_CLONE_MIN_RELEASE})
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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def _create_sparse_file(self, path, size):
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"""Creates file with 0 disk usage."""
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sizestr = _sizestr(size)
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self._execute('truncate', '-s', sizestr, path, run_as_root=True)
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def _allocate_file_blocks(self, path, size):
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"""Preallocate file blocks by writing zeros."""
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block_size_mb = 1
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block_count = size * units.GiB / (block_size_mb * units.MiB)
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self._execute('dd', 'if=/dev/zero', 'of=%s' % path,
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'bs=%dM' % block_size_mb,
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'count=%d' % block_count,
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run_as_root=True)
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def _gpfs_change_attributes(self, options, path):
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"""Update GPFS attributes on the specified file."""
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cmd = ['mmchattr']
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cmd.extend(options)
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cmd.append(path)
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LOG.debug('Update volume attributes with mmchattr to %s.' % options)
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self._execute(*cmd, run_as_root=True)
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def _set_volume_attributes(self, path, metadata):
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"""Set various GPFS attributes for this volume."""
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set_pool = False
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options = []
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for item in metadata:
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if item['key'] == 'data_pool_name':
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options.extend(['-P', item['value']])
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set_pool = True
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elif item['key'] == 'replicas':
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options.extend(['-r', item['value'], '-m', item['value']])
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elif item['key'] == 'dio':
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options.extend(['-D', item['value']])
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elif item['key'] == 'write_affinity_depth':
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options.extend(['--write-affinity-depth', item['value']])
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elif item['key'] == 'block_group_factor':
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options.extend(['--block-group-factor', item['value']])
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elif item['key'] == 'write_affinity_failure_group':
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options.extend(['--write-affinity-failure-group',
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item['value']])
|
|
|
|
# metadata value has precedence over value set in volume type
|
|
if self.configuration.gpfs_storage_pool and not set_pool:
|
|
options.extend(['-P', self.configuration.gpfs_storage_pool])
|
|
|
|
if options:
|
|
self._gpfs_change_attributes(options, path)
|
|
|
|
def create_volume(self, volume):
|
|
"""Creates a GPFS volume."""
|
|
# Check if GPFS is mounted
|
|
self._verify_gpfs_path_state(self.configuration.gpfs_mount_point_base)
|
|
|
|
volume_path = self.local_path(volume)
|
|
volume_size = volume['size']
|
|
|
|
# Create a sparse file first; allocate blocks later if requested
|
|
self._create_sparse_file(volume_path, volume_size)
|
|
self._set_rw_permission(volume_path)
|
|
# Set the attributes prior to allocating any blocks so that
|
|
# they are allocated according to the policy
|
|
v_metadata = volume.get('volume_metadata')
|
|
self._set_volume_attributes(volume_path, v_metadata)
|
|
|
|
if not self.configuration.gpfs_sparse_volumes:
|
|
self._allocate_file_blocks(volume_path, volume_size)
|
|
|
|
fstype = None
|
|
fslabel = None
|
|
for item in v_metadata:
|
|
if item['key'] == 'fstype':
|
|
fstype = item['value']
|
|
elif item['key'] == 'fslabel':
|
|
fslabel = item['value']
|
|
if fstype:
|
|
self._mkfs(volume, fstype, fslabel)
|
|
|
|
def create_volume_from_snapshot(self, volume, snapshot):
|
|
"""Creates a GPFS volume from a snapshot."""
|
|
|
|
volume_path = self.local_path(volume)
|
|
snapshot_path = self.local_path(snapshot)
|
|
self._create_gpfs_copy(src=snapshot_path, dest=volume_path)
|
|
self._set_rw_permission(volume_path)
|
|
self._gpfs_redirect(volume_path)
|
|
virt_size = self._resize_volume_file(volume, volume['size'])
|
|
return {'size': math.ceil(virt_size / units.GiB)}
|
|
|
|
def create_cloned_volume(self, volume, src_vref):
|
|
"""Create a GPFS volume from another volume."""
|
|
|
|
src = self.local_path(src_vref)
|
|
dest = self.local_path(volume)
|
|
self._create_gpfs_clone(src, dest)
|
|
self._set_rw_permission(dest)
|
|
virt_size = self._resize_volume_file(volume, volume['size'])
|
|
return {'size': math.ceil(virt_size / units.GiB)}
|
|
|
|
def _delete_gpfs_file(self, fchild):
|
|
"""Delete a GPFS file and cleanup clone children."""
|
|
|
|
if not os.path.exists(fchild):
|
|
return
|
|
(out, err) = self._execute('mmclone', 'show', fchild, run_as_root=True)
|
|
fparent = None
|
|
inode_regex = re.compile(
|
|
r'.*\s+(?:yes|no)\s+\d+\s+(?P<inode>\d+)', re.M | re.S)
|
|
match = inode_regex.match(out)
|
|
if match:
|
|
inode = match.group('inode')
|
|
path = os.path.dirname(fchild)
|
|
(out, err) = self._execute('find', path, '-maxdepth', '1',
|
|
'-inum', inode, run_as_root=True)
|
|
if out:
|
|
fparent = out.split('\n', 1)[0]
|
|
self._execute(
|
|
'rm', '-f', fchild, check_exit_code=False, run_as_root=True)
|
|
|
|
# There is no need to check for volume references on this snapshot
|
|
# because 'rm -f' itself serves as a simple and implicit check. If the
|
|
# parent is referenced by another volume, GPFS doesn't allow deleting
|
|
# it. 'rm -f' silently fails and the subsequent check on the path
|
|
# indicates whether there are any volumes derived from that snapshot.
|
|
# If there are such volumes, we quit recursion and let the other
|
|
# volumes delete the snapshot later. If there are no references, rm
|
|
# would succeed and the snapshot is deleted.
|
|
if not os.path.exists(fchild) and fparent:
|
|
fpbase = os.path.basename(fparent)
|
|
if fpbase.endswith('.snap') or fpbase.endswith('.ts'):
|
|
self._delete_gpfs_file(fparent)
|
|
|
|
def delete_volume(self, volume):
|
|
"""Deletes a logical volume."""
|
|
# Check if GPFS is mounted
|
|
self._verify_gpfs_path_state(self.configuration.gpfs_mount_point_base)
|
|
|
|
volume_path = self.local_path(volume)
|
|
self._delete_gpfs_file(volume_path)
|
|
|
|
def _gpfs_redirect(self, src):
|
|
"""Removes the copy_on_write dependency between src and parent.
|
|
|
|
Remove the copy_on_write dependency between the src file and its
|
|
immediate parent such that the length of dependency chain is reduced
|
|
by 1.
|
|
"""
|
|
max_depth = self.configuration.gpfs_max_clone_depth
|
|
if max_depth == 0:
|
|
return False
|
|
(out, err) = self._execute('mmclone', 'show', src, run_as_root=True)
|
|
depth_regex = re.compile(r'.*\s+no\s+(?P<depth>\d+)', re.M | re.S)
|
|
match = depth_regex.match(out)
|
|
if match:
|
|
depth = int(match.group('depth'))
|
|
if depth > max_depth:
|
|
self._execute('mmclone', 'redirect', src, run_as_root=True)
|
|
return True
|
|
return False
|
|
|
|
def _create_gpfs_clone(self, src, dest):
|
|
"""Create a GPFS file clone parent for the specified file."""
|
|
snap = dest + ".snap"
|
|
self._create_gpfs_snap(src, snap)
|
|
self._create_gpfs_copy(snap, dest)
|
|
if self._gpfs_redirect(src) and self._gpfs_redirect(dest):
|
|
self._execute('rm', '-f', snap, run_as_root=True)
|
|
|
|
def _create_gpfs_copy(self, src, dest):
|
|
"""Create a GPFS file clone copy for the specified file."""
|
|
self._execute('mmclone', 'copy', src, dest, run_as_root=True)
|
|
|
|
def _create_gpfs_snap(self, src, dest=None):
|
|
"""Create a GPFS file clone snapshot for the specified file."""
|
|
if dest is None:
|
|
self._execute('mmclone', 'snap', src, run_as_root=True)
|
|
else:
|
|
self._execute('mmclone', 'snap', src, dest, run_as_root=True)
|
|
|
|
def _is_gpfs_parent_file(self, gpfs_file):
|
|
"""Return true if the specified file is a gpfs clone parent."""
|
|
out, _ = self._execute('mmclone', 'show', gpfs_file, run_as_root=True)
|
|
ptoken = out.splitlines().pop().split()[0]
|
|
return ptoken == 'yes'
|
|
|
|
def create_snapshot(self, snapshot):
|
|
"""Creates a GPFS snapshot."""
|
|
snapshot_path = self.local_path(snapshot)
|
|
volume_path = os.path.join(self.configuration.gpfs_mount_point_base,
|
|
snapshot['volume_name'])
|
|
self._create_gpfs_snap(src=volume_path, dest=snapshot_path)
|
|
self._set_rw_permission(snapshot_path, modebits='640')
|
|
self._gpfs_redirect(volume_path)
|
|
|
|
def delete_snapshot(self, snapshot):
|
|
"""Deletes a GPFS snapshot."""
|
|
# Rename the deleted snapshot to indicate it no longer exists in
|
|
# cinder db. Attempt to delete the snapshot. If the snapshot has
|
|
# clone children, the delete will fail silently. When volumes that
|
|
# are clone children are deleted in the future, the remaining ts
|
|
# snapshots will also be deleted.
|
|
snapshot_path = self.local_path(snapshot)
|
|
snapshot_ts_path = '%s.ts' % snapshot_path
|
|
self._execute('mv', snapshot_path, snapshot_ts_path, run_as_root=True)
|
|
self._execute('rm', '-f', snapshot_ts_path,
|
|
check_exit_code=False, run_as_root=True)
|
|
|
|
def local_path(self, volume):
|
|
"""Return the local path for the specified volume."""
|
|
return os.path.join(self.configuration.gpfs_mount_point_base,
|
|
volume['name'])
|
|
|
|
def ensure_export(self, context, volume):
|
|
"""Synchronously recreates an export for a logical volume."""
|
|
pass
|
|
|
|
def create_export(self, context, volume):
|
|
"""Exports the volume."""
|
|
pass
|
|
|
|
def remove_export(self, context, volume):
|
|
"""Removes an export for a logical volume."""
|
|
pass
|
|
|
|
def initialize_connection(self, volume, connector):
|
|
return {
|
|
'driver_volume_type': 'local',
|
|
'data': {
|
|
'name': volume['name'],
|
|
'device_path': self.local_path(volume),
|
|
}
|
|
}
|
|
|
|
def terminate_connection(self, volume, connector, **kwargs):
|
|
pass
|
|
|
|
def get_volume_stats(self, refresh=False):
|
|
"""Get volume stats.
|
|
|
|
If 'refresh' is True, or stats have never been updated, run update
|
|
the stats first.
|
|
"""
|
|
if not self._stats or refresh:
|
|
self._update_volume_stats()
|
|
|
|
return self._stats
|
|
|
|
def _update_volume_stats(self):
|
|
"""Retrieve stats info from volume group."""
|
|
|
|
LOG.debug("Updating volume stats.")
|
|
gpfs_base = self.configuration.gpfs_mount_point_base
|
|
data = {}
|
|
backend_name = self.configuration.safe_get('volume_backend_name')
|
|
data["volume_backend_name"] = backend_name or 'GPFS'
|
|
data["vendor_name"] = 'IBM'
|
|
data["driver_version"] = self.VERSION
|
|
data["storage_protocol"] = 'file'
|
|
free, capacity = self._get_available_capacity(self.configuration.
|
|
gpfs_mount_point_base)
|
|
data['total_capacity_gb'] = math.ceil(capacity / units.GiB)
|
|
data['free_capacity_gb'] = math.ceil(free / units.GiB)
|
|
data['reserved_percentage'] = 0
|
|
data['QoS_support'] = False
|
|
data['storage_pool'] = self._storage_pool
|
|
data['location_info'] = ('GPFSDriver:%(cluster_id)s:%(root_path)s' %
|
|
{'cluster_id': self._cluster_id,
|
|
'root_path': gpfs_base})
|
|
|
|
data['reserved_percentage'] = 0
|
|
self._stats = data
|
|
|
|
def clone_image(self, volume, image_location, image_id, image_meta):
|
|
"""Create a volume from the specified image."""
|
|
return self._clone_image(volume, image_location, image_id)
|
|
|
|
def _is_cloneable(self, image_id):
|
|
"""Return true if the specified image can be cloned by GPFS."""
|
|
if not((self.configuration.gpfs_images_dir and
|
|
self.configuration.gpfs_images_share_mode)):
|
|
reason = 'glance repository not configured to use GPFS'
|
|
return False, reason, None
|
|
|
|
image_path = os.path.join(self.configuration.gpfs_images_dir, image_id)
|
|
try:
|
|
self._is_gpfs_path(image_path)
|
|
except processutils.ProcessExecutionError:
|
|
reason = 'image file not in GPFS'
|
|
return False, reason, None
|
|
|
|
return True, None, image_path
|
|
|
|
def _clone_image(self, volume, image_location, image_id):
|
|
"""Attempt to create a volume by efficiently copying image to volume.
|
|
|
|
If both source and target are backed by gpfs storage and the source
|
|
image is in raw format move the image to create a volume using either
|
|
gpfs clone operation or with a file copy. If the image format is not
|
|
raw, convert it to raw at the volume path.
|
|
"""
|
|
# Check if GPFS is mounted
|
|
self._verify_gpfs_path_state(self.configuration.gpfs_mount_point_base)
|
|
|
|
cloneable_image, reason, image_path = self._is_cloneable(image_id)
|
|
if not cloneable_image:
|
|
LOG.debug('Image %(img)s not cloneable: %(reas)s.' %
|
|
{'img': image_id, 'reas': reason})
|
|
return (None, False)
|
|
|
|
vol_path = self.local_path(volume)
|
|
# if the image is not already a GPFS snap file make it so
|
|
if not self._is_gpfs_parent_file(image_path):
|
|
self._create_gpfs_snap(image_path)
|
|
|
|
data = image_utils.qemu_img_info(image_path)
|
|
|
|
# if image format is already raw either clone it or
|
|
# copy it depending on config file settings
|
|
if data.file_format == 'raw':
|
|
if (self.configuration.gpfs_images_share_mode ==
|
|
'copy_on_write'):
|
|
LOG.debug('Clone image to vol %s using mmclone.' %
|
|
volume['id'])
|
|
self._create_gpfs_copy(image_path, vol_path)
|
|
elif self.configuration.gpfs_images_share_mode == 'copy':
|
|
LOG.debug('Clone image to vol %s using copyfile.' %
|
|
volume['id'])
|
|
shutil.copyfile(image_path, vol_path)
|
|
|
|
# if image is not raw convert it to raw into vol_path destination
|
|
else:
|
|
LOG.debug('Clone image to vol %s using qemu convert.' %
|
|
volume['id'])
|
|
image_utils.convert_image(image_path, vol_path, 'raw')
|
|
|
|
self._set_rw_permission(vol_path)
|
|
self._resize_volume_file(volume, volume['size'])
|
|
|
|
return {'provider_location': None}, True
|
|
|
|
def copy_image_to_volume(self, context, volume, image_service, image_id):
|
|
"""Fetch the image from image_service and write it to the volume.
|
|
|
|
Note that cinder.volume.flows.create_volume will attempt to use
|
|
clone_image to efficiently create volume from image when both
|
|
source and target are backed by gpfs storage. If that is not the
|
|
case, this function is invoked and uses fetch_to_raw to create the
|
|
volume.
|
|
"""
|
|
# Check if GPFS is mounted
|
|
self._verify_gpfs_path_state(self.configuration.gpfs_mount_point_base)
|
|
|
|
LOG.debug('Copy image to vol %s using image_utils fetch_to_raw.' %
|
|
volume['id'])
|
|
image_utils.fetch_to_raw(context, image_service, image_id,
|
|
self.local_path(volume),
|
|
self.configuration.volume_dd_blocksize,
|
|
size=volume['size'])
|
|
self._resize_volume_file(volume, volume['size'])
|
|
|
|
def _resize_volume_file(self, volume, new_size):
|
|
"""Resize volume file to new size."""
|
|
vol_path = self.local_path(volume)
|
|
try:
|
|
image_utils.resize_image(vol_path, new_size, run_as_root=True)
|
|
except processutils.ProcessExecutionError as exc:
|
|
LOG.error(_("Failed to resize volume "
|
|
"%(volume_id)s, error: %(error)s.") %
|
|
{'volume_id': volume['id'],
|
|
'error': exc.stderr})
|
|
raise exception.VolumeBackendAPIException(data=exc.stderr)
|
|
|
|
data = image_utils.qemu_img_info(vol_path)
|
|
return data.virtual_size
|
|
|
|
def extend_volume(self, volume, new_size):
|
|
"""Extend an existing volume."""
|
|
self._resize_volume_file(volume, new_size)
|
|
|
|
def copy_volume_to_image(self, context, volume, image_service, image_meta):
|
|
"""Copy the volume to the specified image."""
|
|
image_utils.upload_volume(context,
|
|
image_service,
|
|
image_meta,
|
|
self.local_path(volume))
|
|
|
|
def backup_volume(self, context, backup, backup_service):
|
|
"""Create a new backup from an existing volume."""
|
|
volume = self.db.volume_get(context, backup['volume_id'])
|
|
volume_path = self.local_path(volume)
|
|
LOG.debug(_('Begin backup of volume %s.') % volume['name'])
|
|
|
|
# create a snapshot that will be used as the backup source
|
|
backup_path = '%s_%s' % (volume_path, backup['id'])
|
|
self._create_gpfs_clone(volume_path, backup_path)
|
|
self._gpfs_redirect(volume_path)
|
|
|
|
try:
|
|
with utils.temporary_chown(backup_path):
|
|
with fileutils.file_open(backup_path) as backup_file:
|
|
backup_service.backup(backup, backup_file)
|
|
finally:
|
|
# clean up snapshot file. If it is a clone parent, delete
|
|
# will fail silently, but be cleaned up when volume is
|
|
# eventually removed. This ensures we do not accumulate
|
|
# more than gpfs_max_clone_depth snap files.
|
|
self._delete_gpfs_file(backup_path)
|
|
|
|
def restore_backup(self, context, backup, volume, backup_service):
|
|
"""Restore an existing backup to a new or existing volume."""
|
|
LOG.debug(_('Begin restore of backup %s.') % backup['id'])
|
|
|
|
volume_path = self.local_path(volume)
|
|
with utils.temporary_chown(volume_path):
|
|
with fileutils.file_open(volume_path, 'wb') as volume_file:
|
|
backup_service.restore(backup, volume['id'], volume_file)
|
|
|
|
def _migrate_volume(self, volume, host):
|
|
"""Migrate vol if source and dest are managed by same GPFS cluster."""
|
|
LOG.debug('Migrate volume request %(vol)s to %(host)s.' %
|
|
{'vol': volume['name'],
|
|
'host': host['host']})
|
|
dest_path = self._can_migrate_locally(host)
|
|
|
|
if dest_path is None:
|
|
LOG.debug('Cannot migrate volume locally, use generic migration.')
|
|
return (False, None)
|
|
if dest_path == self.configuration.gpfs_mount_point_base:
|
|
LOG.debug('Migration target is same cluster and path, '
|
|
'no work needed.')
|
|
return (True, None)
|
|
|
|
LOG.debug('Migration target is same cluster but different path, '
|
|
'move the volume file.')
|
|
local_path = self.local_path(volume)
|
|
new_path = os.path.join(dest_path, volume['name'])
|
|
try:
|
|
self._execute('mv', local_path, new_path, run_as_root=True)
|
|
return (True, None)
|
|
except processutils.ProcessExecutionError as exc:
|
|
LOG.error(_('Driver-based migration of volume %(vol) failed. '
|
|
'Move from %(src)s to %(dst)s failed with error: '
|
|
'%(error)s.') %
|
|
{'vol': volume['name'],
|
|
'src': local_path,
|
|
'dst': new_path,
|
|
'error': exc.stderr})
|
|
return (False, None)
|
|
|
|
def migrate_volume(self, context, volume, host):
|
|
"""Attempt to migrate a volume to specified host."""
|
|
return self._migrate_volume(volume, host)
|
|
|
|
def retype(self, context, volume, new_type, diff, host):
|
|
"""Modify volume to be of new type."""
|
|
LOG.debug('Retype volume request %(vol)s to be %(type)s '
|
|
'(host: %(host)s), diff %(diff)s.' %
|
|
{'vol': volume['name'],
|
|
'type': new_type,
|
|
'host': host,
|
|
'diff': diff})
|
|
|
|
retyped = False
|
|
migrated = False
|
|
pools = diff['extra_specs'].get('capabilities:storage_pool')
|
|
|
|
backends = diff['extra_specs'].get('volume_backend_name')
|
|
hosts = (volume['host'], host['host'])
|
|
|
|
# if different backends let migration create a new volume and copy
|
|
# data because the volume is considered to be substantially different
|
|
if _different(backends):
|
|
LOG.debug('Retype request is for different backends, '
|
|
'use migration: %s %s.' % backends)
|
|
return False
|
|
|
|
if _different(pools):
|
|
old, new = pools
|
|
LOG.debug('Retype pool attribute from %s to %s.' % pools)
|
|
retyped = self._update_volume_storage_pool(self.local_path(volume),
|
|
new)
|
|
|
|
if _different(hosts):
|
|
LOG.debug('Retype hosts migrate from: %s to %s.' % hosts)
|
|
migrated, mdl_update = self._migrate_volume(volume, host)
|
|
if migrated:
|
|
updates = {'host': host['host']}
|
|
self.db.volume_update(context, volume['id'], updates)
|
|
|
|
return retyped or migrated
|
|
|
|
def _mkfs(self, volume, filesystem, label=None):
|
|
"""Initialize volume to be specified filesystem type."""
|
|
if filesystem == 'swap':
|
|
cmd = ['mkswap']
|
|
else:
|
|
cmd = ['mkfs', '-t', filesystem]
|
|
|
|
if filesystem in ('ext3', 'ext4'):
|
|
cmd.append('-F')
|
|
if label:
|
|
if filesystem in ('msdos', 'vfat'):
|
|
label_opt = '-n'
|
|
else:
|
|
label_opt = '-L'
|
|
cmd.extend([label_opt, label])
|
|
|
|
path = self.local_path(volume)
|
|
cmd.append(path)
|
|
try:
|
|
self._execute(*cmd, run_as_root=True)
|
|
except processutils.ProcessExecutionError as exc:
|
|
exception_message = (_("mkfs failed on volume %(vol)s, "
|
|
"error message was: %(err)s.")
|
|
% {'vol': volume['name'], 'err': exc.stderr})
|
|
LOG.error(exception_message)
|
|
raise exception.VolumeBackendAPIException(
|
|
data=exception_message)
|
|
|
|
def _get_available_capacity(self, path):
|
|
"""Calculate available space on path."""
|
|
# Check if GPFS is mounted
|
|
try:
|
|
self._verify_gpfs_path_state(path)
|
|
mounted = True
|
|
except exception.VolumeBackendAPIException:
|
|
mounted = False
|
|
|
|
# If GPFS is not mounted, return zero capacity. So that the volume
|
|
# request can be scheduled to another volume service.
|
|
if not mounted:
|
|
return 0, 0
|
|
|
|
out, _ = self._execute('df', '-P', '-B', '1', path,
|
|
run_as_root=True)
|
|
out = out.splitlines()[1]
|
|
size = int(out.split()[1])
|
|
available = int(out.split()[3])
|
|
return available, size
|
|
|
|
def _verify_gpfs_path_state(self, path):
|
|
"""Examine if GPFS is active and file system is mounted or not."""
|
|
try:
|
|
self._is_gpfs_path(path)
|
|
except processutils.ProcessExecutionError:
|
|
msg = (_('%s cannot be accessed. Verify that GPFS is active and '
|
|
'file system is mounted.') % path)
|
|
LOG.error(msg)
|
|
raise exception.VolumeBackendAPIException(data=msg)
|