def _get_snapshot_by_backing_file(self, volume, backing_file):
all_snapshots = objects.SnapshotList.get_all_for_volume(
context.get_admin_context(), volume.id)
for snapshot in all_snapshots:
snap_backing_file = snapshot.metadata.get('backing_file')
if utils.paths_normcase_equal(snap_backing_file or '',
backing_file):
return snapshot
def _get_snapshot_by_backing_file(self, volume, backing_file):
all_snapshots = objects.SnapshotList.get_all_for_volume(
context.get_admin_context(), volume.id)
for snapshot in all_snapshots:
snap_backing_file = snapshot.metadata.get('backing_file')
if utils.paths_normcase_equal(snap_backing_file or '',
backing_file):
return snapshot
def _delete_snapshot(self, snapshot):
# NOTE(lpetrut): We're slightly diverging from the super class
# workflow. The reason is that we cannot query in-use vhd/x images,
# nor can we add or remove images from a vhd/x chain in this case.
volume_status = snapshot.volume.status
if volume_status != 'in-use':
return super(WindowsSmbfsDriver, self)._delete_snapshot(snapshot)
info_path = self._local_path_volume_info(snapshot.volume)
snap_info = self._read_info_file(info_path, empty_if_missing=True)
if snapshot.id not in snap_info:
LOG.info(
'Snapshot record for %s is not present, allowing '
'snapshot_delete to proceed.', snapshot.id)
return
file_to_merge = snap_info[snapshot.id]
delete_info = {
'file_to_merge': file_to_merge,
'volume_id': snapshot.volume.id
}
self._nova_assisted_vol_snap_delete(snapshot._context, snapshot,
delete_info)
# At this point, the image file should no longer be in use, so we
# may safely query it so that we can update the 'active' image
# reference, if needed.
merged_img_path = os.path.join(self._local_volume_dir(snapshot.volume),
file_to_merge)
if utils.paths_normcase_equal(snap_info['active'], file_to_merge):
new_active_file_path = self._vhdutils.get_vhd_parent_path(
merged_img_path).lower()
snap_info['active'] = os.path.basename(new_active_file_path)
self._delete(merged_img_path)
# TODO(lpetrut): drop snapshot info file usage.
del (snap_info[snapshot.id])
self._write_info_file(info_path, snap_info)
def _delete_snapshot(self, snapshot):
# NOTE(lpetrut): We're slightly diverging from the super class
# workflow. The reason is that we cannot query in-use vhd/x images,
# nor can we add or remove images from a vhd/x chain in this case.
volume_status = snapshot.volume.status
if volume_status != 'in-use':
return super(WindowsSmbfsDriver, self)._delete_snapshot(snapshot)
info_path = self._local_path_volume_info(snapshot.volume)
snap_info = self._read_info_file(info_path, empty_if_missing=True)
if snapshot.id not in snap_info:
LOG.info('Snapshot record for %s is not present, allowing '
'snapshot_delete to proceed.', snapshot.id)
return
file_to_merge = snap_info[snapshot.id]
delete_info = {'file_to_merge': file_to_merge,
'volume_id': snapshot.volume.id}
self._nova_assisted_vol_snap_delete(
snapshot._context, snapshot, delete_info)
# At this point, the image file should no longer be in use, so we
# may safely query it so that we can update the 'active' image
# reference, if needed.
merged_img_path = os.path.join(
self._local_volume_dir(snapshot.volume),
file_to_merge)
if utils.paths_normcase_equal(snap_info['active'], file_to_merge):
new_active_file_path = self._vhdutils.get_vhd_parent_path(
merged_img_path).lower()
snap_info['active'] = os.path.basename(new_active_file_path)
self._delete(merged_img_path)
# TODO(lpetrut): drop snapshot info file usage.
del(snap_info[snapshot.id])
self._write_info_file(info_path, snap_info)
def _delete_snapshot(self, snapshot):
# NOTE(lpetrut): We're slightly diverging from the super class
# workflow. The reason is that we cannot query in-use vhd/x images,
# nor can we add or remove images from a vhd/x chain in this case.
info_path = self._local_path_volume_info(snapshot.volume)
snap_info = self._read_info_file(info_path, empty_if_missing=True)
if snapshot.id not in snap_info:
LOG.info('Snapshot record for %s is not present, allowing '
'snapshot_delete to proceed.', snapshot.id)
return
file_to_merge = snap_info[snapshot.id]
deleting_latest_snap = utils.paths_normcase_equal(snap_info['active'],
file_to_merge)
if not self._is_volume_attached(snapshot.volume):
super(WindowsSmbfsDriver, self)._delete_snapshot(snapshot)
else:
delete_info = {'file_to_merge': file_to_merge,
'volume_id': snapshot.volume.id}
self._nova_assisted_vol_snap_delete(
snapshot._context, snapshot, delete_info)
# At this point, the image file should no longer be in use, so we
# may safely query it so that we can update the 'active' image
# reference, if needed.
merged_img_path = os.path.join(
self._local_volume_dir(snapshot.volume),
file_to_merge)
if deleting_latest_snap:
new_active_file_path = self._vhdutils.get_vhd_parent_path(
merged_img_path).lower()
snap_info['active'] = os.path.basename(new_active_file_path)
self._delete(merged_img_path)
# TODO(lpetrut): drop snapshot info file usage.
del(snap_info[snapshot.id])
self._write_info_file(info_path, snap_info)
if not isinstance(snapshot, objects.Snapshot):
LOG.debug("Received a '%s' object, skipping setting the backing "
"file in the DB.", type(snapshot))
elif not deleting_latest_snap:
backing_file = snapshot['metadata'].get('backing_file')
higher_snapshot = self._get_snapshot_by_backing_file(
snapshot.volume, file_to_merge)
# The snapshot objects should have a backing file set, unless
# created before an upgrade. If the snapshot we're deleting
# does not have a backing file set yet there is a newer one that
# does, we're clearing it out so that it won't provide wrong info.
if higher_snapshot:
LOG.debug("Updating backing file reference (%(backing_file)s) "
"for higher snapshot: %(higher_snapshot_id)s.",
dict(backing_file=snapshot.metadata['backing_file'],
higher_snapshot_id=higher_snapshot.id))
higher_snapshot.metadata['backing_file'] = (
snapshot.metadata['backing_file'])
higher_snapshot.save()
if not (higher_snapshot and backing_file):
LOG.info(
"The deleted snapshot is not latest one, yet we could not "
"find snapshot backing file information in the DB. This "
"may happen after an upgrade. Certain operations against "
"this volume may be unavailable while it's in-use.")
def _delete_snapshot(self, snapshot):
# NOTE(lpetrut): We're slightly diverging from the super class
# workflow. The reason is that we cannot query in-use vhd/x images,
# nor can we add or remove images from a vhd/x chain in this case.
info_path = self._local_path_volume_info(snapshot.volume)
snap_info = self._read_info_file(info_path, empty_if_missing=True)
if snapshot.id not in snap_info:
LOG.info(
'Snapshot record for %s is not present, allowing '
'snapshot_delete to proceed.', snapshot.id)
return
file_to_merge = snap_info[snapshot.id]
deleting_latest_snap = utils.paths_normcase_equal(
snap_info['active'], file_to_merge)
if not self._is_volume_attached(snapshot.volume):
super(WindowsSmbfsDriver, self)._delete_snapshot(snapshot)
else:
delete_info = {
'file_to_merge': file_to_merge,
'volume_id': snapshot.volume.id
}
self._nova_assisted_vol_snap_delete(snapshot._context, snapshot,
delete_info)
# At this point, the image file should no longer be in use, so we
# may safely query it so that we can update the 'active' image
# reference, if needed.
merged_img_path = os.path.join(
self._local_volume_dir(snapshot.volume), file_to_merge)
if deleting_latest_snap:
new_active_file_path = self._vhdutils.get_vhd_parent_path(
merged_img_path).lower()
snap_info['active'] = os.path.basename(new_active_file_path)
self._delete(merged_img_path)
# TODO(lpetrut): drop snapshot info file usage.
del (snap_info[snapshot.id])
self._write_info_file(info_path, snap_info)
if not isinstance(snapshot, objects.Snapshot):
LOG.debug(
"Received a '%s' object, skipping setting the backing "
"file in the DB.", type(snapshot))
elif not deleting_latest_snap:
backing_file = snapshot['metadata'].get('backing_file')
higher_snapshot = self._get_snapshot_by_backing_file(
snapshot.volume, file_to_merge)
# The snapshot objects should have a backing file set, unless
# created before an upgrade. If the snapshot we're deleting
# does not have a backing file set yet there is a newer one that
# does, we're clearing it out so that it won't provide wrong info.
if higher_snapshot:
LOG.debug(
"Updating backing file reference (%(backing_file)s) "
"for higher snapshot: %(higher_snapshot_id)s.",
dict(backing_file=snapshot.metadata['backing_file'],
higher_snapshot_id=higher_snapshot.id))
higher_snapshot.metadata['backing_file'] = (
snapshot.metadata['backing_file'])
higher_snapshot.save()
if not (higher_snapshot and backing_file):
LOG.info(
"The deleted snapshot is not latest one, yet we could not "
"find snapshot backing file information in the DB. This "
"may happen after an upgrade. Certain operations against "
"this volume may be unavailable while it's in-use.")
