Remove unused exceptions

This patch cleans up cinder.exception module by deleting unused
execptions from it.

Change-Id: Idb07d69475306f43116977b5fb9b0ea863c1f65b

cinder/exception.py

@@ -294,10 +294,6 @@ class InvalidGlobalAPIVersion(Invalid):
                 "is %(min_ver)s and maximum is %(max_ver)s.")
 
 
-class MissingRequired(Invalid):
-    message = _("Missing required element '%(element)s' in request body.")
-
-
 class ValidationError(Invalid):
     message = "%(detail)s"
 
@@ -357,11 +353,6 @@ class VolumeMetadataNotFound(NotFound):
                 "key %(metadata_key)s.")
 
 
-class VolumeAdminMetadataNotFound(NotFound):
-    message = _("Volume %(volume_id)s has no administration metadata with "
-                "key %(metadata_key)s.")
-
-
 class InvalidVolumeMetadata(Invalid):
     message = _("Invalid metadata: %(reason)s")
 
@@ -449,10 +440,6 @@ class SnapshotIsBusy(CinderException):
                 "dependent volumes")
 
 
-class ISCSITargetNotFoundForVolume(NotFound):
-    message = _("No target id found for volume %(volume_id)s.")
-
-
 class InvalidImageRef(Invalid):
     message = _("Invalid image href %(image_href)s.")
 
@@ -563,10 +550,6 @@ class QuotaUsageNotFound(QuotaNotFound):
     message = _("Quota usage for project %(project_id)s could not be found.")
 
 
-class ReservationNotFound(QuotaNotFound):
-    message = _("Quota reservation %(uuid)s could not be found.")
-
-
 class OverQuota(CinderException):
     message = _("Quota exceeded for resources: %(overs)s")
 
@@ -606,14 +589,6 @@ class GroupVolumeTypeMappingExists(Duplicate):
                 "%(volume_type_id)s combination already exists.")
 
 
-class GroupTypeEncryptionExists(Invalid):
-    message = _("Group type encryption for type %(type_id)s already exists.")
-
-
-class GroupTypeEncryptionNotFound(NotFound):
-    message = _("Group type encryption for type %(type_id)s does not exist.")
-
-
 class MalformedRequestBody(CinderException):
     message = _("Malformed message body: %(reason)s")
 
@@ -630,11 +605,6 @@ class NoValidBackend(CinderException):
     message = _("No valid backend was found. %(reason)s")
 
 
-class NoMoreTargets(CinderException):
-    """No more available targets."""
-    pass
-
-
 class QuotaError(CinderException):
     message = _("Quota exceeded: code=%(code)s")
     code = 413
@@ -748,10 +718,6 @@ class RemoveExportException(VolumeDriverException):
     message = _("Failed to remove export for volume %(volume)s: %(reason)s")
 
 
-class MetadataCreateFailure(Invalid):
-    message = _("Failed to create metadata for volume: %(reason)s")
-
-
 class MetadataUpdateFailure(Invalid):
     message = _("Failed to update metadata for volume: %(reason)s")
 
@@ -802,10 +768,6 @@ class BackupNotFound(NotFound):
     message = _("Backup %(backup_id)s could not be found.")
 
 
-class BackupFailedToGetVolumeBackend(NotFound):
-    message = _("Failed to identify volume backend.")
-
-
 class InvalidBackup(Invalid):
     message = _("Invalid backup: %(reason)s")
 
@@ -899,11 +861,6 @@ class ReplicationGroupError(CinderException):
                 "error: %(reason)s.")
 
 
-class ReplicationNotFound(NotFound):
-    message = _("Volume replication for %(volume_id)s "
-                "could not be found.")
-
-
 class ManageExistingVolumeTypeMismatch(CinderException):
     message = _("Manage existing volume failed due to volume type mismatch: "
                 "%(reason)s")
@@ -921,16 +878,8 @@ class LockCreationFailed(CinderException):
     message = _('Unable to create lock. Coordination backend not started.')
 
 
-class LockingFailed(CinderException):
-    message = _('Lock acquisition failed.')
-
-
-UnsupportedObjectError = obj_exc.UnsupportedObjectError
 OrphanedObjectError = obj_exc.OrphanedObjectError
-IncompatibleObjectVersion = obj_exc.IncompatibleObjectVersion
-ReadOnlyFieldError = obj_exc.ReadOnlyFieldError
 ObjectActionError = obj_exc.ObjectActionError
-ObjectFieldInvalid = obj_exc.ObjectFieldInvalid
 
 
 class CappedVersionUnknown(CinderException):

cinder/volume/flows/manager/create_volume.py

@@ -98,7 +98,6 @@ def __init__(self, reschedule_context, db, driver, scheduler_rpcapi,
             # they fail, rescheduling will likely attempt to create the volume
             # on another machine when it still exists locally.
             exception.MetadataCopyFailure,
-            exception.MetadataCreateFailure,
             exception.MetadataUpdateFailure,
             # The volume/snapshot has been removed from the database, that
             # can not be fixed by rescheduling.