Spec ModifyVolume for QoS kep-3751

Author: sunnylovestiramisu

csi.proto

@@ -100,6 +100,11 @@ service Controller {
     returns (ControllerGetVolumeResponse) {
         option (alpha_method) = true;
     }
+
+  rpc ControllerModifyVolume (ModifyVolumeRequest)
+    returns (ModifyVolumeResponse) {
+        option (alpha_method) = true;
+    }
 }
 
 service GroupController {
@@ -376,6 +381,10 @@ message CreateVolumeRequest {
   // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
   // choose where the provisioned volume is accessible from.
   TopologyRequirement accessibility_requirements = 7;
+
+  // This field is OPTIONAL. This allows the CO to specify the
+  // volume performance class parameters to apply. 
+  map<string, string> mutable_parameters = 8;
 }
 
 // Specifies what source the volume will be created from. One of the
@@ -974,6 +983,21 @@ message ControllerGetVolumeResponse {
   // This field is REQUIRED.
   VolumeStatus status = 2;
 }
+message ModifyVolumeRequest {
+  option (alpha_message) = true;
+
+  // Contains identity information for the existing volume.
+  // This field is REQUIRED.
+  string volume_id = 1;
+  // This field is OPTIONAL.This allows the CO to specify the
+  // mutable parameters to apply. 
+  map<string, string> mutable_parameters = 2;
+}
+
+message ModifyVolumeResponse {
+  option (alpha_message) = true;
+}
+
 message GetCapacityRequest {
   // If specified, the Plugin SHALL report the capacity of the storage
   // that can be used to provision volumes that satisfy ALL of the
@@ -1113,6 +1137,10 @@ message ControllerServiceCapability {
       // SINGLE_NODE_SINGLE_WRITER and/or SINGLE_NODE_MULTI_WRITER are
       // supported, in order to permit older COs to continue working.
       SINGLE_NODE_MULTI_WRITER = 13 [(alpha_enum_value) = true];
+
+      // Indicates the SP supports modifying volume with mutable
+      // parameters. See ModifyVolume for details.
+      MODIFY_VOLUME = 14 [(alpha_enum_value) = true];
     }
 
     Type type = 1;