validate type of snapshotted/cloned volume to be thin

Signed-off-by: Alexandr Stefurishin <alexandr.stefurishin@flant.com>

images/sds-local-volume-csi/src/driver/controller.go

@@ -146,6 +146,10 @@ func (d *Driver) CreateVolume(ctx context.Context, request *csi.CreateVolumeRequ
 				return nil, status.Errorf(codes.NotFound, "error getting LVMLogicalVolume %s: %s", sourceVolume.Name, err.Error())
 			}
 
+			if sourceVol.Spec.Type != internal.LVMTypeThin {
+				return nil, status.Errorf(codes.InvalidArgument, "Source LVMLogicalVolume '%s' is not of 'Thin' type", sourceVol.Name)
+			}
+
 			// check size
 			sourceSizeQty, err := resource.ParseQuantity(sourceVol.Spec.Size)
 			if err != nil {
@@ -372,6 +376,10 @@ func (d *Driver) CreateSnapshot(ctx context.Context, request *csi.CreateSnapshot
 		return nil, status.Errorf(codes.Internal, "error getting LVMLogicalVolume %s: %s", request.SourceVolumeId, err.Error())
 	}
 
+	if llv.Spec.Type != internal.LVMTypeThin {
+		return nil, status.Errorf(codes.InvalidArgument, "Source LVMLogicalVolume '%s' is not of 'Thin' type", request.SourceVolumeId)
+	}
+
 	// the snapshots are required to be created in the same node and device class as the source volume.
 
 	// suggested name is in form "snapshot-{uuid}" and it can't be used, because