OpenStack Block Storage (Cinder)
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cinder/cinder/volume/drivers/windows/smbfs.py

268 lines
11 KiB

# Copyright (c) 2014 Cloudbase Solutions SRL
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import os
import re
import sys
from oslo.config import cfg
from cinder import exception
from cinder.image import image_utils
from cinder.openstack.common import fileutils
from cinder.openstack.common.gettextutils import _
from cinder.openstack.common import log as logging
from cinder.openstack.common import units
from cinder import utils
from cinder.volume.drivers import smbfs
from cinder.volume.drivers.windows import remotefs
from cinder.volume.drivers.windows import vhdutils
VERSION = '1.0.0'
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
CONF.set_default('smbfs_shares_config', r'C:\OpenStack\smbfs_shares.txt')
CONF.set_default('smbfs_mount_point_base', r'C:\OpenStack\_mnt')
CONF.set_default('smbfs_default_volume_format', 'vhd')
class WindowsSmbfsDriver(smbfs.SmbfsDriver):
VERSION = VERSION
def __init__(self, *args, **kwargs):
super(WindowsSmbfsDriver, self).__init__(*args, **kwargs)
self.base = getattr(self.configuration,
'smbfs_mount_point_base',
CONF.smbfs_mount_point_base)
opts = getattr(self.configuration,
'smbfs_mount_options',
CONF.smbfs_mount_options)
self._remotefsclient = remotefs.WindowsRemoteFsClient(
'cifs', root_helper=None, smbfs_mount_point_base=self.base,
smbfs_mount_options=opts)
self.vhdutils = vhdutils.VHDUtils()
def do_setup(self, context):
self._check_os_platform()
super(WindowsSmbfsDriver, self).do_setup(context)
def _check_os_platform(self):
if sys.platform != 'win32':
_msg = _("This system platform (%s) is not supported. This "
"driver supports only Win32 platforms.") % sys.platform
raise exception.SmbfsException(_msg)
def _do_create_volume(self, volume):
volume_path = self.local_path(volume)
volume_format = self.get_volume_format(volume)
volume_size_bytes = volume['size'] * units.Gi
if os.path.exists(volume_path):
err_msg = _('File already exists at: %s') % volume_path
raise exception.InvalidVolume(err_msg)
if volume_format not in (self._DISK_FORMAT_VHD,
self._DISK_FORMAT_VHDX):
err_msg = _("Unsupported volume format: %s ") % volume_format
raise exception.InvalidVolume(err_msg)
self.vhdutils.create_dynamic_vhd(volume_path, volume_size_bytes)
def _ensure_share_mounted(self, smbfs_share):
mnt_options = {}
if self.shares.get(smbfs_share) is not None:
mnt_flags = self.shares[smbfs_share]
mnt_options = self.parse_options(mnt_flags)[1]
self._remotefsclient.mount(smbfs_share, mnt_options)
def _delete(self, path):
fileutils.delete_if_exists(path)
def _get_capacity_info(self, smbfs_share):
"""Calculate available space on the SMBFS share.
:param smbfs_share: example //172.18.194.100/var/smbfs
"""
total_size, total_available = self._remotefsclient.get_capacity_info(
smbfs_share)
total_allocated = self._get_total_allocated(smbfs_share)
return_value = [total_size, total_available, total_allocated]
LOG.info('Smb share %s Total size %s Total allocated %s'
% (smbfs_share, total_size, total_allocated))
return [float(x) for x in return_value]
def _get_total_allocated(self, smbfs_share):
elements = os.listdir(smbfs_share)
total_allocated = 0
for element in elements:
element_path = os.path.join(smbfs_share, element)
if not self._remotefsclient.is_symlink(element_path):
if "snapshot" in element:
continue
if re.search(r'\.vhdx?$', element):
total_allocated += self.vhdutils.get_vhd_size(
element_path)['VirtualSize']
continue
if os.path.isdir(element_path):
total_allocated += self._get_total_allocated(element_path)
continue
total_allocated += os.path.getsize(element_path)
return total_allocated
def _img_commit(self, snapshot_path):
self.vhdutils.merge_vhd(snapshot_path)
self._delete(snapshot_path)
def _rebase_img(self, image, backing_file, volume_format):
# Relative path names are not supported in this case.
image_dir = os.path.dirname(image)
backing_file_path = os.path.join(image_dir, backing_file)
self.vhdutils.reconnect_parent(image, backing_file_path)
def _qemu_img_info(self, path, volume_name=None):
# This code expects to deal only with relative filenames.
# As this method is needed by the upper class and qemu-img does
# not fully support vhdx images, for the moment we'll use Win32 API
# for retrieving image information.
parent_path = self.vhdutils.get_vhd_parent_path(path)
file_format = os.path.splitext(path)[1][1:].lower()
if parent_path:
backing_file_name = os.path.split(parent_path)[1].lower()
else:
backing_file_name = None
class ImageInfo(object):
def __init__(self, image, backing_file):
self.image = image
self.backing_file = backing_file
self.file_format = file_format
return ImageInfo(os.path.basename(path),
backing_file_name)
def _do_create_snapshot(self, snapshot, backing_file, new_snap_path):
backing_file_full_path = os.path.join(
self._local_volume_dir(snapshot['volume']),
backing_file)
self.vhdutils.create_differencing_vhd(new_snap_path,
backing_file_full_path)
def _do_extend_volume(self, volume_path, size_gb):
self.vhdutils.resize_vhd(volume_path, size_gb * units.Gi)
@utils.synchronized('smbfs', external=False)
def copy_volume_to_image(self, context, volume, image_service, image_meta):
"""Copy the volume to the specified image."""
# If snapshots exist, flatten to a temporary image, and upload it
active_file = self.get_active_image_from_info(volume)
active_file_path = os.path.join(self._local_volume_dir(volume),
active_file)
backing_file = self.vhdutils.get_vhd_parent_path(active_file_path)
root_file_fmt = self.get_volume_format(volume)
temp_path = None
try:
if backing_file or root_file_fmt == self._DISK_FORMAT_VHDX:
temp_file_name = '%s.temp_image.%s.%s' % (
volume['id'],
image_meta['id'],
self._DISK_FORMAT_VHD)
temp_path = os.path.join(self._local_volume_dir(volume),
temp_file_name)
self.vhdutils.convert_vhd(active_file_path, temp_path)
upload_path = temp_path
else:
upload_path = active_file_path
image_utils.upload_volume(context,
image_service,
image_meta,
upload_path,
self._DISK_FORMAT_VHD)
finally:
if temp_path:
self._delete(temp_path)
def copy_image_to_volume(self, context, volume, image_service, image_id):
"""Fetch the image from image_service and write it to the volume."""
volume_format = self.get_volume_format(volume, qemu_format=True)
image_meta = image_service.show(context, image_id)
fetch_format = volume_format
fetch_path = self.local_path(volume)
self._delete(fetch_path)
qemu_version = self.get_qemu_version()
needs_conversion = False
if (qemu_version < [1, 7] and (
volume_format == self._DISK_FORMAT_VHDX and
image_meta['disk_format'] != self._DISK_FORMAT_VHDX)):
needs_conversion = True
fetch_format = 'vpc'
temp_file_name = '%s.temp_image.%s.%s' % (
volume['id'],
image_meta['id'],
self._DISK_FORMAT_VHD)
fetch_path = os.path.join(self._local_volume_dir(volume),
temp_file_name)
image_utils.fetch_to_volume_format(
context, image_service, image_id,
fetch_path, fetch_format,
self.configuration.volume_dd_blocksize)
if needs_conversion:
self.vhdutils.convert_vhd(fetch_path, self.local_path(volume))
self._delete(fetch_path)
self.vhdutils.resize_vhd(self.local_path(volume),
volume['size'] * units.Gi)
def _copy_volume_from_snapshot(self, snapshot, volume, volume_size):
"""Copy data from snapshot to destination volume."""
LOG.debug("snapshot: %(snap)s, volume: %(vol)s, "
"volume_size: %(size)s" %
{'snap': snapshot['id'],
'vol': volume['id'],
'size': snapshot['volume_size']})
info_path = self._local_path_volume_info(snapshot['volume'])
snap_info = self._read_info_file(info_path)
vol_dir = self._local_volume_dir(snapshot['volume'])
forward_file = snap_info[snapshot['id']]
forward_path = os.path.join(vol_dir, forward_file)
# Find the file which backs this file, which represents the point
# when this snapshot was created.
img_info = self._qemu_img_info(forward_path)
snapshot_path = os.path.join(vol_dir, img_info.backing_file)
volume_path = self.local_path(volume)
self._delete(volume_path)
self.vhdutils.convert_vhd(snapshot_path,
volume_path)
self.vhdutils.resize_vhd(volume_path, volume_size * units.Gi)