Add name field in DeleteVolumeRequest

Author: chakri-nelluri

csi.proto

@@ -270,15 +270,34 @@ message VolumeMetadata {
 ////////
 ////////
 message DeleteVolumeRequest {
+  message Reference {
+    // The ID of the volume to be deprovisioned. This field is REQUIRED.
+    VolumeID volume_id = 1;
+
+    // The metadata of the volume to be deprovisioned. This field is
+    // OPTIONAL.
+    VolumeMetadata volume_metadata = 2;
+  }
+
   // The API version assumed by the CO. This field is REQUIRED.
   Version version = 1;
 
-  // The ID of the volume to be deprovisioned. This field is REQUIRED.
-  VolumeID volume_id = 2;
-
-  // The metadata of the volume to be deprovisioned. This field is
-  // OPTIONAL.
-  VolumeMetadata volume_metadata = 3;
+  // Either `name` or `reference` SHALL be specified by the CO. A CO MAY specify
+  // the `name` when the volume ID and metadata are unknown. For example, in the
+  // case where a `CreateVolume` RPC fails and the CO is unsure of the completion
+  // state of the request AND no longer needs the possibly-created volume.
+  // Alternatively, a CO MAY specify the `reference` field (ID and metadata) when
+  // such information is available to it.
+  // This field is REQUIRED.
+  oneof handle {
+    // The CO-generated name of the volume to delete, same as in
+    // `CreateVolumeRequest`.
+    string name = 2;
+
+    // The plugin-generated reference to the volume, as returned in
+    // `CreateVolumeResponse`.
+    Reference reference = 3;
+  }
 }
 
 message DeleteVolumeResponse {