683 lines
28 KiB
Python
683 lines
28 KiB
Python
# Copyright (c) 2012 NetApp, Inc. All rights reserved.
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# Copyright (c) 2014 Ben Swartzlander. All rights reserved.
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# Copyright (c) 2014 Navneet Singh. All rights reserved.
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# Copyright (c) 2014 Clinton Knight. All rights reserved.
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# Copyright (c) 2014 Alex Meade. All rights reserved.
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# Copyright (c) 2014 Bob Callaway. 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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Volume driver for NetApp NFS storage.
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"""
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import os
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import re
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from threading import Timer
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import time
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from oslo.concurrency import processutils
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from oslo.utils import excutils
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from oslo.utils import units
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import six.moves.urllib.parse as urlparse
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from cinder import exception
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from cinder.i18n import _, _LE, _LI, _LW
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from cinder.image import image_utils
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from cinder.openstack.common import log as logging
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from cinder import utils
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from cinder.volume.drivers.netapp import options as na_opts
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from cinder.volume.drivers.netapp import utils as na_utils
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from cinder.volume.drivers import nfs
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LOG = logging.getLogger(__name__)
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class NetAppNfsDriver(nfs.NfsDriver):
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"""Base class for NetApp NFS driver for Data ONTAP."""
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# do not increment this as it may be used in volume type definitions
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VERSION = "1.0.0"
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REQUIRED_FLAGS = ['netapp_login', 'netapp_password',
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'netapp_server_hostname']
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def __init__(self, *args, **kwargs):
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na_utils.validate_instantiation(**kwargs)
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self._execute = None
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self._context = None
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self._app_version = kwargs.pop("app_version", "unknown")
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super(NetAppNfsDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(na_opts.netapp_connection_opts)
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self.configuration.append_config_values(na_opts.netapp_basicauth_opts)
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self.configuration.append_config_values(na_opts.netapp_transport_opts)
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self.configuration.append_config_values(na_opts.netapp_img_cache_opts)
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def set_execute(self, execute):
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self._execute = execute
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def do_setup(self, context):
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super(NetAppNfsDriver, self).do_setup(context)
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self._context = context
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na_utils.check_flags(self.REQUIRED_FLAGS, self.configuration)
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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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super(NetAppNfsDriver, self).check_for_setup_error()
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def get_pool(self, volume):
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"""Return pool name where volume resides.
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:param volume: The volume hosted by the driver.
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:return: Name of the pool where given volume is hosted.
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"""
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return volume['provider_location']
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def create_volume_from_snapshot(self, volume, snapshot):
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"""Creates a volume from a snapshot."""
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vol_size = volume.size
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snap_size = snapshot.volume_size
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self._clone_volume(snapshot.name, volume.name, snapshot.volume_id)
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share = self._get_volume_location(snapshot.volume_id)
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volume['provider_location'] = share
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path = self.local_path(volume)
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run_as_root = self._execute_as_root
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if self._discover_file_till_timeout(path):
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self._set_rw_permissions(path)
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if vol_size != snap_size:
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try:
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self.extend_volume(volume, vol_size)
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except Exception:
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with excutils.save_and_reraise_exception():
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LOG.error(
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_LE("Resizing %s failed. Cleaning volume."),
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volume.name)
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self._execute('rm', path, run_as_root=run_as_root)
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else:
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raise exception.CinderException(
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_("NFS file %s not discovered.") % volume['name'])
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return {'provider_location': volume['provider_location']}
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def create_snapshot(self, snapshot):
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"""Creates a snapshot."""
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self._clone_volume(snapshot['volume_name'],
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snapshot['name'],
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snapshot['volume_id'])
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def delete_snapshot(self, snapshot):
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"""Deletes a snapshot."""
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nfs_mount = self._get_provider_location(snapshot.volume_id)
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if self._volume_not_present(nfs_mount, snapshot.name):
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return True
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self._execute('rm', self._get_volume_path(nfs_mount, snapshot.name),
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run_as_root=self._execute_as_root)
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def _get_volume_location(self, volume_id):
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"""Returns NFS mount address as <nfs_ip_address>:<nfs_mount_dir>."""
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nfs_server_ip = self._get_host_ip(volume_id)
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export_path = self._get_export_path(volume_id)
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return nfs_server_ip + ':' + export_path
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def _clone_volume(self, volume_name, clone_name, volume_id, share=None):
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"""Clones mounted volume using NetApp API."""
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raise NotImplementedError()
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def _get_provider_location(self, volume_id):
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"""Returns provider location for given volume."""
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volume = self.db.volume_get(self._context, volume_id)
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return volume.provider_location
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def _get_host_ip(self, volume_id):
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"""Returns IP address for the given volume."""
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return self._get_provider_location(volume_id).split(':')[0]
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def _get_export_path(self, volume_id):
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"""Returns NFS export path for the given volume."""
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return self._get_provider_location(volume_id).split(':')[1]
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def _volume_not_present(self, nfs_mount, volume_name):
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"""Check if volume exists."""
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try:
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self._try_execute('ls', self._get_volume_path(nfs_mount,
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volume_name))
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except processutils.ProcessExecutionError:
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# If the volume isn't present
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return True
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return False
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def _try_execute(self, *command, **kwargs):
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# NOTE(vish): Volume commands can partially fail due to timing, but
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# running them a second time on failure will usually
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# recover nicely.
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tries = 0
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while True:
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try:
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self._execute(*command, **kwargs)
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return True
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except processutils.ProcessExecutionError:
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tries += 1
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if tries >= self.configuration.num_shell_tries:
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raise
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LOG.exception(_LE("Recovering from a failed execute. "
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"Try number %s"), tries)
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time.sleep(tries ** 2)
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def _get_volume_path(self, nfs_share, volume_name):
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"""Get volume path (local fs path) for given volume name on given nfs
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share.
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@param nfs_share string, example 172.18.194.100:/var/nfs
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@param volume_name string,
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example volume-91ee65ec-c473-4391-8c09-162b00c68a8c
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"""
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return os.path.join(self._get_mount_point_for_share(nfs_share),
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volume_name)
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def create_cloned_volume(self, volume, src_vref):
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"""Creates a clone of the specified volume."""
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vol_size = volume.size
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src_vol_size = src_vref.size
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self._clone_volume(src_vref.name, volume.name, src_vref.id)
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share = self._get_volume_location(src_vref.id)
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volume['provider_location'] = share
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path = self.local_path(volume)
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if self._discover_file_till_timeout(path):
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self._set_rw_permissions(path)
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if vol_size != src_vol_size:
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try:
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self.extend_volume(volume, vol_size)
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except Exception as e:
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LOG.error(
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_LE("Resizing %s failed. Cleaning volume."),
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volume.name)
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self._execute('rm', path,
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run_as_root=self._execute_as_root)
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raise e
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else:
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raise exception.CinderException(
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_("NFS file %s not discovered.") % volume['name'])
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return {'provider_location': volume['provider_location']}
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def _update_volume_stats(self):
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"""Retrieve stats info from volume group."""
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raise NotImplementedError()
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def copy_image_to_volume(self, context, volume, image_service, image_id):
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"""Fetch the image from image_service and write it to the volume."""
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super(NetAppNfsDriver, self).copy_image_to_volume(
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context, volume, image_service, image_id)
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LOG.info(_LI('Copied image to volume %s using regular download.'),
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volume['name'])
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self._register_image_in_cache(volume, image_id)
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def _register_image_in_cache(self, volume, image_id):
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"""Stores image in the cache."""
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file_name = 'img-cache-%s' % image_id
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LOG.info(_LI("Registering image in cache %s"), file_name)
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try:
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self._do_clone_rel_img_cache(
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volume['name'], file_name,
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volume['provider_location'], file_name)
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except Exception as e:
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LOG.warning(_LW('Exception while registering image %(image_id)s'
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' in cache. Exception: %(exc)s')
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% {'image_id': image_id, 'exc': e.__str__()})
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def _find_image_in_cache(self, image_id):
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"""Finds image in cache and returns list of shares with file name."""
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result = []
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if getattr(self, '_mounted_shares', None):
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for share in self._mounted_shares:
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dir = self._get_mount_point_for_share(share)
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file_name = 'img-cache-%s' % image_id
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file_path = '%s/%s' % (dir, file_name)
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if os.path.exists(file_path):
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LOG.debug('Found cache file for image %(image_id)s'
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' on share %(share)s'
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% {'image_id': image_id, 'share': share})
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result.append((share, file_name))
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return result
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def _do_clone_rel_img_cache(self, src, dst, share, cache_file):
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"""Do clone operation w.r.t image cache file."""
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@utils.synchronized(cache_file, external=True)
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def _do_clone():
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dir = self._get_mount_point_for_share(share)
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file_path = '%s/%s' % (dir, dst)
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if not os.path.exists(file_path):
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LOG.info(_LI('Cloning from cache to destination %s'), dst)
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self._clone_volume(src, dst, volume_id=None, share=share)
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_do_clone()
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@utils.synchronized('clean_cache')
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def _spawn_clean_cache_job(self):
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"""Spawns a clean task if not running."""
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if getattr(self, 'cleaning', None):
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LOG.debug('Image cache cleaning in progress. Returning... ')
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return
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else:
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# Set cleaning to True
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self.cleaning = True
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t = Timer(0, self._clean_image_cache)
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t.start()
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def _clean_image_cache(self):
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"""Clean the image cache files in cache of space crunch."""
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try:
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LOG.debug('Image cache cleaning in progress.')
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thres_size_perc_start =\
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self.configuration.thres_avl_size_perc_start
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thres_size_perc_stop = \
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self.configuration.thres_avl_size_perc_stop
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for share in getattr(self, '_mounted_shares', []):
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try:
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total_size, total_avl, _total_alc = \
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self._get_capacity_info(share)
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avl_percent = int((total_avl / total_size) * 100)
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if avl_percent <= thres_size_perc_start:
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LOG.info(_LI('Cleaning cache for share %s.'), share)
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eligible_files = self._find_old_cache_files(share)
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threshold_size = int(
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(thres_size_perc_stop * total_size) / 100)
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bytes_to_free = int(threshold_size - total_avl)
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LOG.debug('Files to be queued for deletion %s',
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eligible_files)
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self._delete_files_till_bytes_free(
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eligible_files, share, bytes_to_free)
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else:
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continue
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except Exception as e:
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LOG.warning(_LW('Exception during cache cleaning'
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' %(share)s. Message - %(ex)s')
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% {'share': share, 'ex': e.__str__()})
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continue
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finally:
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LOG.debug('Image cache cleaning done.')
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self.cleaning = False
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def _shortlist_del_eligible_files(self, share, old_files):
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"""Prepares list of eligible files to be deleted from cache."""
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raise NotImplementedError()
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def _find_old_cache_files(self, share):
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"""Finds the old files in cache."""
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mount_fs = self._get_mount_point_for_share(share)
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threshold_minutes = self.configuration.expiry_thres_minutes
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cmd = ['find', mount_fs, '-maxdepth', '1', '-name',
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'img-cache*', '-amin', '+%s' % threshold_minutes]
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res, _err = self._execute(*cmd, run_as_root=self._execute_as_root)
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if res:
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old_file_paths = res.strip('\n').split('\n')
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mount_fs_len = len(mount_fs)
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old_files = [x[mount_fs_len + 1:] for x in old_file_paths]
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eligible_files = self._shortlist_del_eligible_files(
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share, old_files)
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return eligible_files
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return []
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def _delete_files_till_bytes_free(self, file_list, share, bytes_to_free=0):
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"""Delete files from disk till bytes are freed or list exhausted."""
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LOG.debug('Bytes to free %s', bytes_to_free)
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if file_list and bytes_to_free > 0:
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sorted_files = sorted(file_list, key=lambda x: x[1], reverse=True)
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mount_fs = self._get_mount_point_for_share(share)
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for f in sorted_files:
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if f:
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file_path = '%s/%s' % (mount_fs, f[0])
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LOG.debug('Delete file path %s', file_path)
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@utils.synchronized(f[0], external=True)
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def _do_delete():
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if self._delete_file(file_path):
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return True
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return False
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if _do_delete():
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bytes_to_free -= int(f[1])
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if bytes_to_free <= 0:
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return
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def _delete_file(self, path):
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"""Delete file from disk and return result as boolean."""
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try:
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LOG.debug('Deleting file at path %s', path)
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cmd = ['rm', '-f', path]
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self._execute(*cmd, run_as_root=self._execute_as_root)
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return True
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except Exception as ex:
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LOG.warning(_LW('Exception during deleting %s'), ex.__str__())
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return False
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def clone_image(self, volume, image_location, image_id, image_meta):
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"""Create a volume efficiently from an existing image.
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image_location is a string whose format depends on the
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image service backend in use. The driver should use it
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to determine whether cloning is possible.
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image_id is a string which represents id of the image.
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It can be used by the driver to introspect internal
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stores or registry to do an efficient image clone.
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Returns a dict of volume properties eg. provider_location,
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boolean indicating whether cloning occurred.
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"""
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cloned = False
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post_clone = False
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try:
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cache_result = self._find_image_in_cache(image_id)
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if cache_result:
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cloned = self._clone_from_cache(volume, image_id, cache_result)
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else:
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cloned = self._direct_nfs_clone(volume, image_location,
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image_id)
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if cloned:
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post_clone = self._post_clone_image(volume)
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except Exception as e:
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msg = e.msg if getattr(e, 'msg', None) else e.__str__()
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LOG.info(_LI('Image cloning unsuccessful for image'
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' %(image_id)s. Message: %(msg)s')
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% {'image_id': image_id, 'msg': msg})
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vol_path = self.local_path(volume)
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volume['provider_location'] = None
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if os.path.exists(vol_path):
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self._delete_file(vol_path)
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finally:
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cloned = cloned and post_clone
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share = volume['provider_location'] if cloned else None
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bootable = True if cloned else False
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return {'provider_location': share, 'bootable': bootable}, cloned
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def _clone_from_cache(self, volume, image_id, cache_result):
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"""Clones a copy from image cache."""
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cloned = False
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LOG.info(_LI('Cloning image %s from cache'), image_id)
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for res in cache_result:
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# Repeat tries in other shares if failed in some
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(share, file_name) = res
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LOG.debug('Cache share: %s', share)
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if (share and
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self._is_share_vol_compatible(volume, share)):
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try:
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self._do_clone_rel_img_cache(
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file_name, volume['name'], share, file_name)
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cloned = True
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volume['provider_location'] = share
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break
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except Exception:
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LOG.warning(_LW('Unexpected exception during'
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' image cloning in share %s'), share)
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return cloned
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def _direct_nfs_clone(self, volume, image_location, image_id):
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"""Clone directly in nfs share."""
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LOG.info(_LI('Checking image clone %s from glance share.'), image_id)
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cloned = False
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image_location = self._construct_image_nfs_url(image_location)
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share = self._is_cloneable_share(image_location)
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run_as_root = self._execute_as_root
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if share and self._is_share_vol_compatible(volume, share):
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LOG.debug('Share is cloneable %s', share)
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volume['provider_location'] = share
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(__, ___, img_file) = image_location.rpartition('/')
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dir_path = self._get_mount_point_for_share(share)
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img_path = '%s/%s' % (dir_path, img_file)
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img_info = image_utils.qemu_img_info(img_path,
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run_as_root=run_as_root)
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if img_info.file_format == 'raw':
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LOG.debug('Image is raw %s', image_id)
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self._clone_volume(
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img_file, volume['name'],
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volume_id=None, share=share)
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cloned = True
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else:
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LOG.info(
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_LI('Image will locally be converted to raw %s'),
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image_id)
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dst = '%s/%s' % (dir_path, volume['name'])
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image_utils.convert_image(img_path, dst, 'raw',
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run_as_root=run_as_root)
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data = image_utils.qemu_img_info(dst, run_as_root=run_as_root)
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if data.file_format != "raw":
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raise exception.InvalidResults(
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_("Converted to raw, but"
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" format is now %s") % data.file_format)
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else:
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cloned = True
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self._register_image_in_cache(
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volume, image_id)
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return cloned
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|
|
|
def _post_clone_image(self, volume):
|
|
"""Do operations post image cloning."""
|
|
LOG.info(_LI('Performing post clone for %s'), volume['name'])
|
|
vol_path = self.local_path(volume)
|
|
if self._discover_file_till_timeout(vol_path):
|
|
self._set_rw_permissions(vol_path)
|
|
self._resize_image_file(vol_path, volume['size'])
|
|
return True
|
|
raise exception.InvalidResults(
|
|
_("NFS file could not be discovered."))
|
|
|
|
def _resize_image_file(self, path, new_size):
|
|
"""Resize the image file on share to new size."""
|
|
LOG.debug('Checking file for resize')
|
|
if self._is_file_size_equal(path, new_size):
|
|
return
|
|
else:
|
|
LOG.info(_LI('Resizing file to %sG'), new_size)
|
|
image_utils.resize_image(path, new_size,
|
|
run_as_root=self._execute_as_root)
|
|
if self._is_file_size_equal(path, new_size):
|
|
return
|
|
else:
|
|
raise exception.InvalidResults(
|
|
_('Resizing image file failed.'))
|
|
|
|
def _is_file_size_equal(self, path, size):
|
|
"""Checks if file size at path is equal to size."""
|
|
data = image_utils.qemu_img_info(path,
|
|
run_as_root=self._execute_as_root)
|
|
virt_size = data.virtual_size / units.Gi
|
|
if virt_size == size:
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
def _discover_file_till_timeout(self, path, timeout=45):
|
|
"""Checks if file size at path is equal to size."""
|
|
# Sometimes nfs takes time to discover file
|
|
# Retrying in case any unexpected situation occurs
|
|
retry_seconds = timeout
|
|
sleep_interval = 2
|
|
while True:
|
|
if os.path.exists(path):
|
|
return True
|
|
else:
|
|
if retry_seconds <= 0:
|
|
LOG.warning(_LW('Discover file retries exhausted.'))
|
|
return False
|
|
else:
|
|
time.sleep(sleep_interval)
|
|
retry_seconds -= sleep_interval
|
|
|
|
def _is_cloneable_share(self, image_location):
|
|
"""Finds if the image at location is cloneable."""
|
|
conn, dr = self._check_get_nfs_path_segs(image_location)
|
|
return self._check_share_in_use(conn, dr)
|
|
|
|
def _check_get_nfs_path_segs(self, image_location):
|
|
"""Checks if the nfs path format is matched.
|
|
|
|
WebNFS url format with relative-path is supported.
|
|
Accepting all characters in path-names and checking
|
|
against the mounted shares which will contain only
|
|
allowed path segments. Returns connection and dir details.
|
|
"""
|
|
conn, dr = None, None
|
|
if image_location:
|
|
nfs_loc_pattern = \
|
|
('^nfs://(([\w\-\.]+:{1}[\d]+|[\w\-\.]+)(/[^\/].*)'
|
|
'*(/[^\/\\\\]+)$)')
|
|
matched = re.match(nfs_loc_pattern, image_location, flags=0)
|
|
if not matched:
|
|
LOG.debug('Image location not in the'
|
|
' expected format %s', image_location)
|
|
else:
|
|
conn = matched.group(2)
|
|
dr = matched.group(3) or '/'
|
|
return conn, dr
|
|
|
|
def _share_match_for_ip(self, ip, shares):
|
|
"""Returns the share that is served by ip.
|
|
|
|
Multiple shares can have same dir path but
|
|
can be served using different ips. It finds the
|
|
share which is served by ip on same nfs server.
|
|
"""
|
|
raise NotImplementedError()
|
|
|
|
def _check_share_in_use(self, conn, dir):
|
|
"""Checks if share is cinder mounted and returns it."""
|
|
try:
|
|
if conn:
|
|
host = conn.split(':')[0]
|
|
ip = na_utils.resolve_hostname(host)
|
|
share_candidates = []
|
|
for sh in self._mounted_shares:
|
|
sh_exp = sh.split(':')[1]
|
|
if sh_exp == dir:
|
|
share_candidates.append(sh)
|
|
if share_candidates:
|
|
LOG.debug('Found possible share matches %s',
|
|
share_candidates)
|
|
return self._share_match_for_ip(ip, share_candidates)
|
|
except Exception:
|
|
LOG.warning(_LW("Unexpected exception while "
|
|
"short listing used share."))
|
|
return None
|
|
|
|
def _construct_image_nfs_url(self, image_location):
|
|
"""Construct direct url for nfs backend.
|
|
|
|
It creates direct url from image_location
|
|
which is a tuple with direct_url and locations.
|
|
Returns url with nfs scheme if nfs store
|
|
else returns url. It needs to be verified
|
|
by backend before use.
|
|
"""
|
|
|
|
direct_url, locations = image_location
|
|
if not direct_url and not locations:
|
|
raise exception.NotFound(_('Image location not present.'))
|
|
|
|
# Locations will be always a list of one until
|
|
# bp multiple-image-locations is introduced
|
|
if not locations:
|
|
return direct_url
|
|
location = locations[0]
|
|
url = location['url']
|
|
if not location['metadata']:
|
|
return url
|
|
location_type = location['metadata'].get('type')
|
|
if not location_type or location_type.lower() != "nfs":
|
|
return url
|
|
share_location = location['metadata'].get('share_location')
|
|
mount_point = location['metadata'].get('mount_point')
|
|
if not share_location or not mount_point:
|
|
return url
|
|
url_parse = urlparse.urlparse(url)
|
|
abs_path = os.path.join(url_parse.netloc, url_parse.path)
|
|
rel_path = os.path.relpath(abs_path, mount_point)
|
|
direct_url = "%s/%s" % (share_location, rel_path)
|
|
return direct_url
|
|
|
|
def extend_volume(self, volume, new_size):
|
|
"""Extend an existing volume to the new size."""
|
|
LOG.info(_LI('Extending volume %s.'), volume['name'])
|
|
path = self.local_path(volume)
|
|
self._resize_image_file(path, new_size)
|
|
|
|
def _is_share_vol_compatible(self, volume, share):
|
|
"""Checks if share is compatible with volume to host it."""
|
|
raise NotImplementedError()
|
|
|
|
def _check_share_can_hold_size(self, share, size):
|
|
"""Checks if volume can hold image with size."""
|
|
_tot_size, tot_available, _tot_allocated = self._get_capacity_info(
|
|
share)
|
|
if tot_available < size:
|
|
msg = _("Container size smaller than required file size.")
|
|
raise exception.VolumeDriverException(msg)
|
|
|
|
def _move_nfs_file(self, source_path, dest_path):
|
|
"""Moves source to destination."""
|
|
|
|
@utils.synchronized(dest_path, external=True)
|
|
def _move_file(src, dst):
|
|
if os.path.exists(dst):
|
|
LOG.warning(_LW("Destination %s already exists."), dst)
|
|
return False
|
|
self._execute('mv', src, dst, run_as_root=self._execute_as_root)
|
|
return True
|
|
|
|
try:
|
|
return _move_file(source_path, dest_path)
|
|
except Exception as e:
|
|
LOG.warning(_LW('Exception moving file %(src)s. Message - %(e)s')
|
|
% {'src': source_path, 'e': e})
|
|
return False
|
|
|
|
def _get_export_ip_path(self, volume_id=None, share=None):
|
|
"""Returns export ip and path.
|
|
|
|
One of volume id or share is used to return the values.
|
|
"""
|
|
|
|
if volume_id:
|
|
host_ip = self._get_host_ip(volume_id)
|
|
export_path = self._get_export_path(volume_id)
|
|
elif share:
|
|
host_ip = share.split(':')[0]
|
|
export_path = share.split(':')[1]
|
|
else:
|
|
raise exception.InvalidInput(
|
|
'A volume ID or share was not specified.')
|
|
return host_ip, export_path
|
|
|
|
def _get_extended_capacity_info(self, nfs_share):
|
|
"""Returns an extended set of share capacity metrics."""
|
|
|
|
total_size, total_available, total_allocated = \
|
|
self._get_capacity_info(nfs_share)
|
|
|
|
used_ratio = (total_size - total_available) / total_size
|
|
subscribed_ratio = total_allocated / total_size
|
|
apparent_size = max(0, total_size * self.configuration.nfs_used_ratio)
|
|
apparent_available = max(0, apparent_size - total_allocated)
|
|
|
|
return {'total_size': total_size, 'total_available': total_available,
|
|
'total_allocated': total_allocated, 'used_ratio': used_ratio,
|
|
'subscribed_ratio': subscribed_ratio,
|
|
'apparent_size': apparent_size,
|
|
'apparent_available': apparent_available}
|