nvmeof: add stub ControllerExpandVolume for csi-resizer compatibility

Add EXPAND_VOLUME capability and stub implementation to allow
csi-resizer to start and handle VolumeAttributesClass modifications.

Signed-off-by: gadi-didi <[email protected]>

Author: gadididi

internal/nvmeof/controller/controllerserver.go

@@ -354,6 +354,18 @@ func (cs *Server) ControllerModifyVolume(
 	}
 }
 
+// ControllerExpandVolume handles volume expansion requests.
+// For now it only updates the capacity in the response as NVMe-oF
+// this must be added because ControllerModifyVolume requires the sidecar csi-resizer. and
+// csi-resizer searches for the capacity ControllerServiceCapability_RPC_EXPAND_VOLUME.
+// In the future, if NVMe-oF gateway supports volume expansion, the logic must be added here.
+func (cs *Server) ControllerExpandVolume(
+	ctx context.Context,
+	req *csi.ControllerExpandVolumeRequest,
+) (*csi.ControllerExpandVolumeResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "ControllerExpandVolume is not implemented for NVMe-oF volumes")
+}
+
 // validateCreateVolumeRequest validates the incoming request for nvmeof.
 // the rest of the parameters are validated by RBD.
 func validateCreateVolumeRequest(req *csi.CreateVolumeRequest) error {

internal/nvmeof/driver/driver.go

@@ -64,6 +64,7 @@ func (d *nvmeofDriver) Run(conf *util.Config) {
 			csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
 			csi.ControllerServiceCapability_RPC_PUBLISH_UNPUBLISH_VOLUME,
 			csi.ControllerServiceCapability_RPC_MODIFY_VOLUME,
+			csi.ControllerServiceCapability_RPC_EXPAND_VOLUME,
 		})
 
 		cd.AddVolumeCapabilityAccessModes([]csi.VolumeCapability_AccessMode_Mode{