111 lines
4.1 KiB
Python
111 lines
4.1 KiB
Python
# 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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from oslo_concurrency import processutils
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from oslo_log import log as logging
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import six
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import nova.conf
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from nova.i18n import _LE, _LW
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from nova import utils
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from nova.virt.libvirt import utils as libvirt_utils
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from nova.virt.libvirt.volume import fs
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CONF = nova.conf.CONF
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LOG = logging.getLogger(__name__)
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class LibvirtGlusterfsVolumeDriver(fs.LibvirtBaseFileSystemVolumeDriver):
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"""Class implements libvirt part of volume driver for GlusterFS."""
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def _get_mount_point_base(self):
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return CONF.libvirt.glusterfs_mount_point_base
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def get_config(self, connection_info, disk_info):
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"""Returns xml for libvirt."""
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conf = super(LibvirtGlusterfsVolumeDriver,
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self).get_config(connection_info, disk_info)
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data = connection_info['data']
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if 'gluster' in CONF.libvirt.qemu_allowed_storage_drivers:
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vol_name = data['export'].split('/')[1]
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source_host = data['export'].split('/')[0][:-1]
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conf.source_ports = ['24007']
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conf.source_type = 'network'
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conf.source_protocol = 'gluster'
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conf.source_hosts = [source_host]
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conf.source_name = '%s/%s' % (vol_name, data['name'])
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else:
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conf.source_type = 'file'
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conf.source_path = connection_info['data']['device_path']
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conf.driver_format = connection_info['data'].get('format', 'raw')
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return conf
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def connect_volume(self, connection_info, mount_device):
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if 'gluster' not in CONF.libvirt.qemu_allowed_storage_drivers:
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self._ensure_mounted(connection_info)
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connection_info['data']['device_path'] = \
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self._get_device_path(connection_info)
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def disconnect_volume(self, connection_info, disk_dev):
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"""Disconnect the volume."""
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if 'gluster' in CONF.libvirt.qemu_allowed_storage_drivers:
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return
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mount_path = self._get_mount_path(connection_info)
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try:
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utils.execute('umount', mount_path, run_as_root=True)
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except processutils.ProcessExecutionError as exc:
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export = connection_info['data']['export']
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if 'target is busy' in six.text_type(exc):
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LOG.debug("The GlusterFS share %s is still in use.", export)
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else:
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LOG.exception(_LE("Couldn't unmount the GlusterFS share %s"),
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export)
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def _ensure_mounted(self, connection_info):
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"""@type connection_info: dict
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"""
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glusterfs_export = connection_info['data']['export']
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mount_path = self._get_mount_path(connection_info)
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if not libvirt_utils.is_mounted(mount_path, glusterfs_export):
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options = connection_info['data'].get('options')
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self._mount_glusterfs(mount_path, glusterfs_export,
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options, ensure=True)
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return mount_path
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def _mount_glusterfs(self, mount_path, glusterfs_share,
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options=None, ensure=False):
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"""Mount glusterfs export to mount path."""
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utils.execute('mkdir', '-p', mount_path)
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gluster_cmd = ['mount', '-t', 'glusterfs']
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if options is not None:
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gluster_cmd.extend(options.split(' '))
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gluster_cmd.extend([glusterfs_share, mount_path])
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try:
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utils.execute(*gluster_cmd, run_as_root=True)
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except processutils.ProcessExecutionError as exc:
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if ensure and 'already mounted' in six.text_type(exc):
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LOG.warning(_LW("%s is already mounted"), glusterfs_share)
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else:
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raise
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