def snapshot_update_access(self, context, snapshot, access_rules,
add_rules, delete_rules, share_server=None):
"""Update access rules for given snapshot.
This driver has two different behaviors according to parameters:
1. Recovery after error - 'access_rules' contains all access_rules,
'add_rules' and 'delete_rules' shall be empty. Previously existing
access rules are cleared and then added back according
to 'access_rules'.
2. Adding/Deleting of several access rules - 'access_rules' contains
all access_rules, 'add_rules' and 'delete_rules' contain rules which
should be added/deleted. Rules in 'access_rules' are ignored and
only rules from 'add_rules' and 'delete_rules' are applied.
:param context: Current context
:param snapshot: Snapshot model with snapshot data.
:param access_rules: All access rules for given snapshot
:param add_rules: Empty List or List of access rules which should be
added. access_rules already contains these rules.
:param delete_rules: Empty List or List of access rules which should be
removed. access_rules doesn't contain these rules.
:param share_server: None or Share server model
"""
helper = self._get_helper(snapshot['share'])
access_rules, add_rules, delete_rules = utils.change_rules_to_readonly(
access_rules, add_rules, delete_rules)
helper.update_access(self.share_server,
snapshot['name'], access_rules,
add_rules=add_rules, delete_rules=delete_rules)
def snapshot_update_access(self, context, snapshot, access_rules,
add_rules, delete_rules, share_server=None):
# snapshots are to be mounted in read-only mode, see:
# "Add mountable snapshots" on openstack specs.
access_rules, _, _ = utils.change_rules_to_readonly(
access_rules, [], [])
try:
self._update_access(snapshot, access_rules, is_snapshot=True)
except exception.InvalidShareAccess as e:
raise exception.InvalidSnapshotAccess(e)
def revert_to_snapshot(self,
context,
snapshot,
share_access_rules,
snapshot_access_rules,
share_server=None):
share = snapshot['share']
# Temporarily remove all access rules
self._get_helper(share).update_access(self.share_server,
snapshot['name'], [], [], [])
self._get_helper(share).update_access(self.share_server, share['name'],
[], [], [])
# Unmount the snapshot filesystem
self._unmount_device(snapshot)
# Unmount the share filesystem
self._unmount_device(share)
# Merge the snapshot LV back into the share, reverting it
snap_lv_name = "%s/%s" % (self.configuration.lvm_share_volume_group,
snapshot['name'])
self._execute('lvconvert', '--merge', snap_lv_name, run_as_root=True)
# Now recreate the snapshot that was destroyed by the merge
self._create_snapshot(context, snapshot)
# At this point we can mount the share again
device_name = self._get_local_path(share)
self._mount_device(share, device_name)
# Also remount the snapshot
device_name = self._get_local_path(snapshot)
self._mount_device(snapshot, device_name)
# Lastly we add all the access rules back
self._get_helper(share).update_access(self.share_server, share['name'],
share_access_rules, [], [])
snapshot_access_rules, __, __ = utils.change_rules_to_readonly(
snapshot_access_rules, [], [])
self._get_helper(share).update_access(self.share_server,
snapshot['name'],
snapshot_access_rules, [], [])
def revert_to_snapshot(self, context, snapshot, share_access_rules,
snapshot_access_rules, share_server=None):
share = snapshot['share']
# Temporarily remove all access rules
self._get_helper(share).update_access(self.share_server,
snapshot['name'], [], [], [])
self._get_helper(share).update_access(self.share_server,
share['name'], [], [], [])
# Unmount the snapshot filesystem
self._unmount_device(snapshot)
# Unmount the share filesystem
self._unmount_device(share)
# Merge the snapshot LV back into the share, reverting it
snap_lv_name = "%s/%s" % (self.configuration.lvm_share_volume_group,
snapshot['name'])
self._execute('lvconvert', '--merge', snap_lv_name, run_as_root=True)
# Now recreate the snapshot that was destroyed by the merge
self._create_snapshot(context, snapshot)
# At this point we can mount the share again
device_name = self._get_local_path(share)
self._mount_device(share, device_name)
# Also remount the snapshot
device_name = self._get_local_path(snapshot)
self._mount_device(snapshot, device_name)
# Lastly we add all the access rules back
self._get_helper(share).update_access(self.share_server,
share['name'],
share_access_rules,
[], [])
snapshot_access_rules, __, __ = utils.change_rules_to_readonly(
snapshot_access_rules, [], [])
self._get_helper(share).update_access(self.share_server,
snapshot['name'],
snapshot_access_rules,
[], [])
