diff --git a/csi.proto b/csi.proto
index 14b46ad7..b4d1b0cc 100644
--- a/csi.proto
+++ b/csi.proto
@@ -100,6 +100,11 @@ service Controller {
     returns (ControllerGetVolumeResponse) {
         option (alpha_method) = true;
     }
+
+  rpc ControllerModifyVolume (ControllerModifyVolumeRequest)
+    returns (ControllerModifyVolumeResponse) {
+        option (alpha_method) = true;
+    }
 }
 
 service GroupController {
@@ -350,9 +355,10 @@ message CreateVolumeRequest {
   // This field is REQUIRED.
   repeated VolumeCapability volume_capabilities = 3;
 
-  // Plugin specific parameters passed in as opaque key-value pairs.
-  // This field is OPTIONAL. The Plugin is responsible for parsing and
-  // validating these parameters. COs will treat these as opaque.
+  // Plugin specific creation-time parameters passed in as opaque 
+  // key-value pairs. This field is OPTIONAL. The Plugin is responsible 
+  // for parsing and validating these parameters. COs will treat 
+  // these as opaque.
   map<string, string> parameters = 4;
 
   // Secrets required by plugin to complete volume creation request.
@@ -376,6 +382,13 @@ message CreateVolumeRequest {
   // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
   // choose where the provisioned volume is accessible from.
   TopologyRequirement accessibility_requirements = 7;
+
+  // Plugin specific mutable parameters passed in as opaque key-value
+  // pairs. This field is OPTIONAL. The Plugin is responsible for 
+  // parsing and validating these parameters. COs will treat these 
+  // as opaque. Plugins SHOULD treat these as if they take precedence 
+  // over the parameters field.
+  map<string, string> mutable_parameters = 8 [(alpha_field) = true];
 }
 
 // Specifies what source the volume will be created from. One of the
@@ -849,6 +862,10 @@ message ValidateVolumeCapabilitiesRequest {
   // This field is OPTIONAL. Refer to the `Secrets Requirements`
   // section on how to use this field.
   map<string, string> secrets = 5 [(csi_secret) = true];
+
+  // See CreateVolumeRequest.mutable_parameters.
+  // This field is OPTIONAL.
+  map<string, string> mutable_parameters = 6;
 }
 
 message ValidateVolumeCapabilitiesResponse {
@@ -864,6 +881,10 @@ message ValidateVolumeCapabilitiesResponse {
     // The volume creation parameters validated by the plugin.
     // This field is OPTIONAL.
     map<string, string> parameters = 3;
+
+    // The volume creation mutable_parameters validated by the plugin.
+    // This field is OPTIONAL.
+    map<string, string> mutable_parameters = 4;
   }
 
   // Confirmed indicates to the CO the set of capabilities that the
@@ -974,6 +995,32 @@ message ControllerGetVolumeResponse {
   // This field is REQUIRED.
   VolumeStatus status = 2;
 }
+message ControllerModifyVolumeRequest {
+  option (alpha_message) = true;
+
+  // Contains identity information for the existing volume.
+  // This field is REQUIRED.
+  string volume_id = 1;
+
+  // Secrets required by plugin to complete modify volume request.
+  // This field is OPTIONAL. Refer to the `Secrets Requirements`
+  // section on how to use this field.
+  map<string, string> secrets = 2 [(csi_secret) = true];
+
+  // Plugin specific parameters to apply, passed in as opaque key-value
+  // pairs. This field is OPTIONAL. The Plugin is responsible for
+  // parsing and validating these parameters. COs will treat these
+  // as opaque. COs MUST specify the intended value of every mutable
+  // parameter. Absent keys that were previously assigned a value MUST
+  // be interpreted as a deletion of the key from the set of mutable
+  // parameters.
+  map<string, string> mutable_parameters = 3;
+}
+
+message ControllerModifyVolumeResponse {
+  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 +1160,10 @@ 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 ControllerModifyVolume for details.
+      MODIFY_VOLUME = 14 [(alpha_enum_value) = true];
     }
 
     Type type = 1;
diff --git a/lib/go/csi/csi.pb.go b/lib/go/csi/csi.pb.go
index fa010c37..16735115 100644
--- a/lib/go/csi/csi.pb.go
+++ b/lib/go/csi/csi.pb.go
@@ -260,6 +260,9 @@ const (
 	// SINGLE_NODE_SINGLE_WRITER and/or SINGLE_NODE_MULTI_WRITER are
 	// supported, in order to permit older COs to continue working.
 	ControllerServiceCapability_RPC_SINGLE_NODE_MULTI_WRITER ControllerServiceCapability_RPC_Type = 13
+	// Indicates the SP supports modifying volume with mutable
+	// parameters. See ControllerModifyVolume for details.
+	ControllerServiceCapability_RPC_MODIFY_VOLUME ControllerServiceCapability_RPC_Type = 14
 )
 
 var ControllerServiceCapability_RPC_Type_name = map[int32]string{
@@ -277,6 +280,7 @@ var ControllerServiceCapability_RPC_Type_name = map[int32]string{
 	11: "VOLUME_CONDITION",
 	12: "GET_VOLUME",
 	13: "SINGLE_NODE_MULTI_WRITER",
+	14: "MODIFY_VOLUME",
 }
 
 var ControllerServiceCapability_RPC_Type_value = map[string]int32{
@@ -294,6 +298,7 @@ var ControllerServiceCapability_RPC_Type_value = map[string]int32{
 	"VOLUME_CONDITION":             11,
 	"GET_VOLUME":                   12,
 	"SINGLE_NODE_MULTI_WRITER":     13,
+	"MODIFY_VOLUME":                14,
 }
 
 func (x ControllerServiceCapability_RPC_Type) String() string {
@@ -301,7 +306,7 @@ func (x ControllerServiceCapability_RPC_Type) String() string {
 }
 
 func (ControllerServiceCapability_RPC_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{31, 0, 0}
+	return fileDescriptor_9cdb00adce470e01, []int{33, 0, 0}
 }
 
 type VolumeUsage_Unit int32
@@ -329,7 +334,7 @@ func (x VolumeUsage_Unit) String() string {
 }
 
 func (VolumeUsage_Unit) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{51, 0}
+	return fileDescriptor_9cdb00adce470e01, []int{53, 0}
 }
 
 type NodeServiceCapability_RPC_Type int32
@@ -396,7 +401,7 @@ func (x NodeServiceCapability_RPC_Type) String() string {
 }
 
 func (NodeServiceCapability_RPC_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{55, 0, 0}
+	return fileDescriptor_9cdb00adce470e01, []int{57, 0, 0}
 }
 
 type GroupControllerServiceCapability_RPC_Type int32
@@ -424,7 +429,7 @@ func (x GroupControllerServiceCapability_RPC_Type) String() string {
 }
 
 func (GroupControllerServiceCapability_RPC_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{62, 0, 0}
+	return fileDescriptor_9cdb00adce470e01, []int{64, 0, 0}
 }
 
 type GetPluginInfoRequest struct {
@@ -895,9 +900,10 @@ type CreateVolumeRequest struct {
 	// MUST return the appropriate gRPC error code.
 	// This field is REQUIRED.
 	VolumeCapabilities []*VolumeCapability `protobuf:"bytes,3,rep,name=volume_capabilities,json=volumeCapabilities,proto3" json:"volume_capabilities,omitempty"`
-	// Plugin specific parameters passed in as opaque key-value pairs.
-	// This field is OPTIONAL. The Plugin is responsible for parsing and
-	// validating these parameters. COs will treat these as opaque.
+	// Plugin specific creation-time parameters passed in as opaque
+	// key-value pairs. This field is OPTIONAL. The Plugin is responsible
+	// for parsing and validating these parameters. COs will treat
+	// these as opaque.
 	Parameters map[string]string `protobuf:"bytes,4,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	// Secrets required by plugin to complete volume creation request.
 	// This field is OPTIONAL. Refer to the `Secrets Requirements`
@@ -918,9 +924,15 @@ type CreateVolumeRequest struct {
 	// VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
 	// choose where the provisioned volume is accessible from.
 	AccessibilityRequirements *TopologyRequirement `protobuf:"bytes,7,opt,name=accessibility_requirements,json=accessibilityRequirements,proto3" json:"accessibility_requirements,omitempty"`
-	XXX_NoUnkeyedLiteral      struct{}             `json:"-"`
-	XXX_unrecognized          []byte               `json:"-"`
-	XXX_sizecache             int32                `json:"-"`
+	// Plugin specific mutable parameters passed in as opaque key-value
+	// pairs. This field is OPTIONAL. The Plugin is responsible for
+	// parsing and validating these parameters. COs will treat these
+	// as opaque. Plugins SHOULD treat these as if they take precedence
+	// over the parameters field.
+	MutableParameters    map[string]string `protobuf:"bytes,8,rep,name=mutable_parameters,json=mutableParameters,proto3" json:"mutable_parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
 }
 
 func (m *CreateVolumeRequest) Reset()         { *m = CreateVolumeRequest{} }
@@ -997,6 +1009,13 @@ func (m *CreateVolumeRequest) GetAccessibilityRequirements() *TopologyRequiremen
 	return nil
 }
 
+func (m *CreateVolumeRequest) GetMutableParameters() map[string]string {
+	if m != nil {
+		return m.MutableParameters
+	}
+	return nil
+}
+
 // Specifies what source the volume will be created from. One of the
 // type fields MUST be specified.
 type VolumeContentSource struct {
@@ -2248,7 +2267,10 @@ type ValidateVolumeCapabilitiesRequest struct {
 	// Secrets required by plugin to complete volume validation request.
 	// This field is OPTIONAL. Refer to the `Secrets Requirements`
 	// section on how to use this field.
-	Secrets              map[string]string `protobuf:"bytes,5,rep,name=secrets,proto3" json:"secrets,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Secrets map[string]string `protobuf:"bytes,5,rep,name=secrets,proto3" json:"secrets,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// See CreateVolumeRequest.mutable_parameters.
+	// This field is OPTIONAL.
+	MutableParameters    map[string]string `protobuf:"bytes,6,rep,name=mutable_parameters,json=mutableParameters,proto3" json:"mutable_parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
 	XXX_unrecognized     []byte            `json:"-"`
 	XXX_sizecache        int32             `json:"-"`
@@ -2314,6 +2336,13 @@ func (m *ValidateVolumeCapabilitiesRequest) GetSecrets() map[string]string {
 	return nil
 }
 
+func (m *ValidateVolumeCapabilitiesRequest) GetMutableParameters() map[string]string {
+	if m != nil {
+		return m.MutableParameters
+	}
+	return nil
+}
+
 type ValidateVolumeCapabilitiesResponse struct {
 	// Confirmed indicates to the CO the set of capabilities that the
 	// plugin has validated. This field SHALL only be set to a non-empty
@@ -2381,7 +2410,10 @@ type ValidateVolumeCapabilitiesResponse_Confirmed struct {
 	VolumeCapabilities []*VolumeCapability `protobuf:"bytes,2,rep,name=volume_capabilities,json=volumeCapabilities,proto3" json:"volume_capabilities,omitempty"`
 	// The volume creation parameters validated by the plugin.
 	// This field is OPTIONAL.
-	Parameters           map[string]string `protobuf:"bytes,3,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Parameters map[string]string `protobuf:"bytes,3,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// The volume creation mutable_parameters validated by the plugin.
+	// This field is OPTIONAL.
+	MutableParameters    map[string]string `protobuf:"bytes,4,rep,name=mutable_parameters,json=mutableParameters,proto3" json:"mutable_parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
 	XXX_unrecognized     []byte            `json:"-"`
 	XXX_sizecache        int32             `json:"-"`
@@ -2437,6 +2469,13 @@ func (m *ValidateVolumeCapabilitiesResponse_Confirmed) GetParameters() map[strin
 	return nil
 }
 
+func (m *ValidateVolumeCapabilitiesResponse_Confirmed) GetMutableParameters() map[string]string {
+	if m != nil {
+		return m.MutableParameters
+	}
+	return nil
+}
+
 type ListVolumesRequest struct {
 	// If specified (non-zero value), the Plugin MUST NOT return more
 	// entries than this number in the response. If the actual number of
@@ -2811,6 +2850,104 @@ func (m *ControllerGetVolumeResponse_VolumeStatus) GetVolumeCondition() *VolumeC
 	return nil
 }
 
+type ControllerModifyVolumeRequest struct {
+	// Contains identity information for the existing volume.
+	// This field is REQUIRED.
+	VolumeId string `protobuf:"bytes,1,opt,name=volume_id,json=volumeId,proto3" json:"volume_id,omitempty"`
+	// Secrets required by plugin to complete modify volume request.
+	// This field is OPTIONAL. Refer to the `Secrets Requirements`
+	// section on how to use this field.
+	Secrets map[string]string `protobuf:"bytes,2,rep,name=secrets,proto3" json:"secrets,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Plugin specific parameters to apply, passed in as opaque key-value
+	// pairs. This field is OPTIONAL. The Plugin is responsible for
+	// parsing and validating these parameters. COs will treat these
+	// as opaque. COs MUST specify the intended value of every mutable
+	// parameter. Absent keys that were previously assigned a value MUST
+	// be interpreted as a deletion of the key from the set of mutable
+	// parameters.
+	MutableParameters    map[string]string `protobuf:"bytes,3,rep,name=mutable_parameters,json=mutableParameters,proto3" json:"mutable_parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *ControllerModifyVolumeRequest) Reset()         { *m = ControllerModifyVolumeRequest{} }
+func (m *ControllerModifyVolumeRequest) String() string { return proto.CompactTextString(m) }
+func (*ControllerModifyVolumeRequest) ProtoMessage()    {}
+func (*ControllerModifyVolumeRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_9cdb00adce470e01, []int{27}
+}
+
+func (m *ControllerModifyVolumeRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ControllerModifyVolumeRequest.Unmarshal(m, b)
+}
+func (m *ControllerModifyVolumeRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ControllerModifyVolumeRequest.Marshal(b, m, deterministic)
+}
+func (m *ControllerModifyVolumeRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ControllerModifyVolumeRequest.Merge(m, src)
+}
+func (m *ControllerModifyVolumeRequest) XXX_Size() int {
+	return xxx_messageInfo_ControllerModifyVolumeRequest.Size(m)
+}
+func (m *ControllerModifyVolumeRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ControllerModifyVolumeRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ControllerModifyVolumeRequest proto.InternalMessageInfo
+
+func (m *ControllerModifyVolumeRequest) GetVolumeId() string {
+	if m != nil {
+		return m.VolumeId
+	}
+	return ""
+}
+
+func (m *ControllerModifyVolumeRequest) GetSecrets() map[string]string {
+	if m != nil {
+		return m.Secrets
+	}
+	return nil
+}
+
+func (m *ControllerModifyVolumeRequest) GetMutableParameters() map[string]string {
+	if m != nil {
+		return m.MutableParameters
+	}
+	return nil
+}
+
+type ControllerModifyVolumeResponse struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ControllerModifyVolumeResponse) Reset()         { *m = ControllerModifyVolumeResponse{} }
+func (m *ControllerModifyVolumeResponse) String() string { return proto.CompactTextString(m) }
+func (*ControllerModifyVolumeResponse) ProtoMessage()    {}
+func (*ControllerModifyVolumeResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_9cdb00adce470e01, []int{28}
+}
+
+func (m *ControllerModifyVolumeResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ControllerModifyVolumeResponse.Unmarshal(m, b)
+}
+func (m *ControllerModifyVolumeResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ControllerModifyVolumeResponse.Marshal(b, m, deterministic)
+}
+func (m *ControllerModifyVolumeResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ControllerModifyVolumeResponse.Merge(m, src)
+}
+func (m *ControllerModifyVolumeResponse) XXX_Size() int {
+	return xxx_messageInfo_ControllerModifyVolumeResponse.Size(m)
+}
+func (m *ControllerModifyVolumeResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ControllerModifyVolumeResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ControllerModifyVolumeResponse proto.InternalMessageInfo
+
 type GetCapacityRequest struct {
 	// If specified, the Plugin SHALL report the capacity of the storage
 	// that can be used to provision volumes that satisfy ALL of the
@@ -2839,7 +2976,7 @@ func (m *GetCapacityRequest) Reset()         { *m = GetCapacityRequest{} }
 func (m *GetCapacityRequest) String() string { return proto.CompactTextString(m) }
 func (*GetCapacityRequest) ProtoMessage()    {}
 func (*GetCapacityRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{27}
+	return fileDescriptor_9cdb00adce470e01, []int{29}
 }
 
 func (m *GetCapacityRequest) XXX_Unmarshal(b []byte) error {
@@ -2930,7 +3067,7 @@ func (m *GetCapacityResponse) Reset()         { *m = GetCapacityResponse{} }
 func (m *GetCapacityResponse) String() string { return proto.CompactTextString(m) }
 func (*GetCapacityResponse) ProtoMessage()    {}
 func (*GetCapacityResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{28}
+	return fileDescriptor_9cdb00adce470e01, []int{30}
 }
 
 func (m *GetCapacityResponse) XXX_Unmarshal(b []byte) error {
@@ -2982,7 +3119,7 @@ func (m *ControllerGetCapabilitiesRequest) Reset()         { *m = ControllerGetC
 func (m *ControllerGetCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*ControllerGetCapabilitiesRequest) ProtoMessage()    {}
 func (*ControllerGetCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{29}
+	return fileDescriptor_9cdb00adce470e01, []int{31}
 }
 
 func (m *ControllerGetCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
@@ -3016,7 +3153,7 @@ func (m *ControllerGetCapabilitiesResponse) Reset()         { *m = ControllerGet
 func (m *ControllerGetCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*ControllerGetCapabilitiesResponse) ProtoMessage()    {}
 func (*ControllerGetCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{30}
+	return fileDescriptor_9cdb00adce470e01, []int{32}
 }
 
 func (m *ControllerGetCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
@@ -3059,7 +3196,7 @@ func (m *ControllerServiceCapability) Reset()         { *m = ControllerServiceCa
 func (m *ControllerServiceCapability) String() string { return proto.CompactTextString(m) }
 func (*ControllerServiceCapability) ProtoMessage()    {}
 func (*ControllerServiceCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{31}
+	return fileDescriptor_9cdb00adce470e01, []int{33}
 }
 
 func (m *ControllerServiceCapability) XXX_Unmarshal(b []byte) error {
@@ -3122,7 +3259,7 @@ func (m *ControllerServiceCapability_RPC) Reset()         { *m = ControllerServi
 func (m *ControllerServiceCapability_RPC) String() string { return proto.CompactTextString(m) }
 func (*ControllerServiceCapability_RPC) ProtoMessage()    {}
 func (*ControllerServiceCapability_RPC) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{31, 0}
+	return fileDescriptor_9cdb00adce470e01, []int{33, 0}
 }
 
 func (m *ControllerServiceCapability_RPC) XXX_Unmarshal(b []byte) error {
@@ -3185,7 +3322,7 @@ func (m *CreateSnapshotRequest) Reset()         { *m = CreateSnapshotRequest{} }
 func (m *CreateSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*CreateSnapshotRequest) ProtoMessage()    {}
 func (*CreateSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{32}
+	return fileDescriptor_9cdb00adce470e01, []int{34}
 }
 
 func (m *CreateSnapshotRequest) XXX_Unmarshal(b []byte) error {
@@ -3248,7 +3385,7 @@ func (m *CreateSnapshotResponse) Reset()         { *m = CreateSnapshotResponse{}
 func (m *CreateSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*CreateSnapshotResponse) ProtoMessage()    {}
 func (*CreateSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{33}
+	return fileDescriptor_9cdb00adce470e01, []int{35}
 }
 
 func (m *CreateSnapshotResponse) XXX_Unmarshal(b []byte) error {
@@ -3330,7 +3467,7 @@ func (m *Snapshot) Reset()         { *m = Snapshot{} }
 func (m *Snapshot) String() string { return proto.CompactTextString(m) }
 func (*Snapshot) ProtoMessage()    {}
 func (*Snapshot) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{34}
+	return fileDescriptor_9cdb00adce470e01, []int{36}
 }
 
 func (m *Snapshot) XXX_Unmarshal(b []byte) error {
@@ -3410,7 +3547,7 @@ func (m *DeleteSnapshotRequest) Reset()         { *m = DeleteSnapshotRequest{} }
 func (m *DeleteSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteSnapshotRequest) ProtoMessage()    {}
 func (*DeleteSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{35}
+	return fileDescriptor_9cdb00adce470e01, []int{37}
 }
 
 func (m *DeleteSnapshotRequest) XXX_Unmarshal(b []byte) error {
@@ -3455,7 +3592,7 @@ func (m *DeleteSnapshotResponse) Reset()         { *m = DeleteSnapshotResponse{}
 func (m *DeleteSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*DeleteSnapshotResponse) ProtoMessage()    {}
 func (*DeleteSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{36}
+	return fileDescriptor_9cdb00adce470e01, []int{38}
 }
 
 func (m *DeleteSnapshotResponse) XXX_Unmarshal(b []byte) error {
@@ -3515,7 +3652,7 @@ func (m *ListSnapshotsRequest) Reset()         { *m = ListSnapshotsRequest{} }
 func (m *ListSnapshotsRequest) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsRequest) ProtoMessage()    {}
 func (*ListSnapshotsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{37}
+	return fileDescriptor_9cdb00adce470e01, []int{39}
 }
 
 func (m *ListSnapshotsRequest) XXX_Unmarshal(b []byte) error {
@@ -3589,7 +3726,7 @@ func (m *ListSnapshotsResponse) Reset()         { *m = ListSnapshotsResponse{} }
 func (m *ListSnapshotsResponse) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsResponse) ProtoMessage()    {}
 func (*ListSnapshotsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{38}
+	return fileDescriptor_9cdb00adce470e01, []int{40}
 }
 
 func (m *ListSnapshotsResponse) XXX_Unmarshal(b []byte) error {
@@ -3635,7 +3772,7 @@ func (m *ListSnapshotsResponse_Entry) Reset()         { *m = ListSnapshotsRespon
 func (m *ListSnapshotsResponse_Entry) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsResponse_Entry) ProtoMessage()    {}
 func (*ListSnapshotsResponse_Entry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{38, 0}
+	return fileDescriptor_9cdb00adce470e01, []int{40, 0}
 }
 
 func (m *ListSnapshotsResponse_Entry) XXX_Unmarshal(b []byte) error {
@@ -3689,7 +3826,7 @@ func (m *ControllerExpandVolumeRequest) Reset()         { *m = ControllerExpandV
 func (m *ControllerExpandVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*ControllerExpandVolumeRequest) ProtoMessage()    {}
 func (*ControllerExpandVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{39}
+	return fileDescriptor_9cdb00adce470e01, []int{41}
 }
 
 func (m *ControllerExpandVolumeRequest) XXX_Unmarshal(b []byte) error {
@@ -3754,7 +3891,7 @@ func (m *ControllerExpandVolumeResponse) Reset()         { *m = ControllerExpand
 func (m *ControllerExpandVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*ControllerExpandVolumeResponse) ProtoMessage()    {}
 func (*ControllerExpandVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{40}
+	return fileDescriptor_9cdb00adce470e01, []int{42}
 }
 
 func (m *ControllerExpandVolumeResponse) XXX_Unmarshal(b []byte) error {
@@ -3835,7 +3972,7 @@ func (m *NodeStageVolumeRequest) Reset()         { *m = NodeStageVolumeRequest{}
 func (m *NodeStageVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeStageVolumeRequest) ProtoMessage()    {}
 func (*NodeStageVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{41}
+	return fileDescriptor_9cdb00adce470e01, []int{43}
 }
 
 func (m *NodeStageVolumeRequest) XXX_Unmarshal(b []byte) error {
@@ -3908,7 +4045,7 @@ func (m *NodeStageVolumeResponse) Reset()         { *m = NodeStageVolumeResponse
 func (m *NodeStageVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeStageVolumeResponse) ProtoMessage()    {}
 func (*NodeStageVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{42}
+	return fileDescriptor_9cdb00adce470e01, []int{44}
 }
 
 func (m *NodeStageVolumeResponse) XXX_Unmarshal(b []byte) error {
@@ -3949,7 +4086,7 @@ func (m *NodeUnstageVolumeRequest) Reset()         { *m = NodeUnstageVolumeReque
 func (m *NodeUnstageVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeUnstageVolumeRequest) ProtoMessage()    {}
 func (*NodeUnstageVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{43}
+	return fileDescriptor_9cdb00adce470e01, []int{45}
 }
 
 func (m *NodeUnstageVolumeRequest) XXX_Unmarshal(b []byte) error {
@@ -3994,7 +4131,7 @@ func (m *NodeUnstageVolumeResponse) Reset()         { *m = NodeUnstageVolumeResp
 func (m *NodeUnstageVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeUnstageVolumeResponse) ProtoMessage()    {}
 func (*NodeUnstageVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{44}
+	return fileDescriptor_9cdb00adce470e01, []int{46}
 }
 
 func (m *NodeUnstageVolumeResponse) XXX_Unmarshal(b []byte) error {
@@ -4078,7 +4215,7 @@ func (m *NodePublishVolumeRequest) Reset()         { *m = NodePublishVolumeReque
 func (m *NodePublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodePublishVolumeRequest) ProtoMessage()    {}
 func (*NodePublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{45}
+	return fileDescriptor_9cdb00adce470e01, []int{47}
 }
 
 func (m *NodePublishVolumeRequest) XXX_Unmarshal(b []byte) error {
@@ -4165,7 +4302,7 @@ func (m *NodePublishVolumeResponse) Reset()         { *m = NodePublishVolumeResp
 func (m *NodePublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodePublishVolumeResponse) ProtoMessage()    {}
 func (*NodePublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{46}
+	return fileDescriptor_9cdb00adce470e01, []int{48}
 }
 
 func (m *NodePublishVolumeResponse) XXX_Unmarshal(b []byte) error {
@@ -4207,7 +4344,7 @@ func (m *NodeUnpublishVolumeRequest) Reset()         { *m = NodeUnpublishVolumeR
 func (m *NodeUnpublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeUnpublishVolumeRequest) ProtoMessage()    {}
 func (*NodeUnpublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{47}
+	return fileDescriptor_9cdb00adce470e01, []int{49}
 }
 
 func (m *NodeUnpublishVolumeRequest) XXX_Unmarshal(b []byte) error {
@@ -4252,7 +4389,7 @@ func (m *NodeUnpublishVolumeResponse) Reset()         { *m = NodeUnpublishVolume
 func (m *NodeUnpublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeUnpublishVolumeResponse) ProtoMessage()    {}
 func (*NodeUnpublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{48}
+	return fileDescriptor_9cdb00adce470e01, []int{50}
 }
 
 func (m *NodeUnpublishVolumeResponse) XXX_Unmarshal(b []byte) error {
@@ -4305,7 +4442,7 @@ func (m *NodeGetVolumeStatsRequest) Reset()         { *m = NodeGetVolumeStatsReq
 func (m *NodeGetVolumeStatsRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetVolumeStatsRequest) ProtoMessage()    {}
 func (*NodeGetVolumeStatsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{49}
+	return fileDescriptor_9cdb00adce470e01, []int{51}
 }
 
 func (m *NodeGetVolumeStatsRequest) XXX_Unmarshal(b []byte) error {
@@ -4364,7 +4501,7 @@ func (m *NodeGetVolumeStatsResponse) Reset()         { *m = NodeGetVolumeStatsRe
 func (m *NodeGetVolumeStatsResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetVolumeStatsResponse) ProtoMessage()    {}
 func (*NodeGetVolumeStatsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{50}
+	return fileDescriptor_9cdb00adce470e01, []int{52}
 }
 
 func (m *NodeGetVolumeStatsResponse) XXX_Unmarshal(b []byte) error {
@@ -4420,7 +4557,7 @@ func (m *VolumeUsage) Reset()         { *m = VolumeUsage{} }
 func (m *VolumeUsage) String() string { return proto.CompactTextString(m) }
 func (*VolumeUsage) ProtoMessage()    {}
 func (*VolumeUsage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{51}
+	return fileDescriptor_9cdb00adce470e01, []int{53}
 }
 
 func (m *VolumeUsage) XXX_Unmarshal(b []byte) error {
@@ -4487,7 +4624,7 @@ func (m *VolumeCondition) Reset()         { *m = VolumeCondition{} }
 func (m *VolumeCondition) String() string { return proto.CompactTextString(m) }
 func (*VolumeCondition) ProtoMessage()    {}
 func (*VolumeCondition) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{52}
+	return fileDescriptor_9cdb00adce470e01, []int{54}
 }
 
 func (m *VolumeCondition) XXX_Unmarshal(b []byte) error {
@@ -4532,7 +4669,7 @@ func (m *NodeGetCapabilitiesRequest) Reset()         { *m = NodeGetCapabilitiesR
 func (m *NodeGetCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetCapabilitiesRequest) ProtoMessage()    {}
 func (*NodeGetCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{53}
+	return fileDescriptor_9cdb00adce470e01, []int{55}
 }
 
 func (m *NodeGetCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
@@ -4566,7 +4703,7 @@ func (m *NodeGetCapabilitiesResponse) Reset()         { *m = NodeGetCapabilities
 func (m *NodeGetCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetCapabilitiesResponse) ProtoMessage()    {}
 func (*NodeGetCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{54}
+	return fileDescriptor_9cdb00adce470e01, []int{56}
 }
 
 func (m *NodeGetCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
@@ -4609,7 +4746,7 @@ func (m *NodeServiceCapability) Reset()         { *m = NodeServiceCapability{} }
 func (m *NodeServiceCapability) String() string { return proto.CompactTextString(m) }
 func (*NodeServiceCapability) ProtoMessage()    {}
 func (*NodeServiceCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{55}
+	return fileDescriptor_9cdb00adce470e01, []int{57}
 }
 
 func (m *NodeServiceCapability) XXX_Unmarshal(b []byte) error {
@@ -4672,7 +4809,7 @@ func (m *NodeServiceCapability_RPC) Reset()         { *m = NodeServiceCapability
 func (m *NodeServiceCapability_RPC) String() string { return proto.CompactTextString(m) }
 func (*NodeServiceCapability_RPC) ProtoMessage()    {}
 func (*NodeServiceCapability_RPC) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{55, 0}
+	return fileDescriptor_9cdb00adce470e01, []int{57, 0}
 }
 
 func (m *NodeServiceCapability_RPC) XXX_Unmarshal(b []byte) error {
@@ -4710,7 +4847,7 @@ func (m *NodeGetInfoRequest) Reset()         { *m = NodeGetInfoRequest{} }
 func (m *NodeGetInfoRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetInfoRequest) ProtoMessage()    {}
 func (*NodeGetInfoRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{56}
+	return fileDescriptor_9cdb00adce470e01, []int{58}
 }
 
 func (m *NodeGetInfoRequest) XXX_Unmarshal(b []byte) error {
@@ -4780,7 +4917,7 @@ func (m *NodeGetInfoResponse) Reset()         { *m = NodeGetInfoResponse{} }
 func (m *NodeGetInfoResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetInfoResponse) ProtoMessage()    {}
 func (*NodeGetInfoResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{57}
+	return fileDescriptor_9cdb00adce470e01, []int{59}
 }
 
 func (m *NodeGetInfoResponse) XXX_Unmarshal(b []byte) error {
@@ -4871,7 +5008,7 @@ func (m *NodeExpandVolumeRequest) Reset()         { *m = NodeExpandVolumeRequest
 func (m *NodeExpandVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeExpandVolumeRequest) ProtoMessage()    {}
 func (*NodeExpandVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{58}
+	return fileDescriptor_9cdb00adce470e01, []int{60}
 }
 
 func (m *NodeExpandVolumeRequest) XXX_Unmarshal(b []byte) error {
@@ -4946,7 +5083,7 @@ func (m *NodeExpandVolumeResponse) Reset()         { *m = NodeExpandVolumeRespon
 func (m *NodeExpandVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeExpandVolumeResponse) ProtoMessage()    {}
 func (*NodeExpandVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{59}
+	return fileDescriptor_9cdb00adce470e01, []int{61}
 }
 
 func (m *NodeExpandVolumeResponse) XXX_Unmarshal(b []byte) error {
@@ -4984,7 +5121,7 @@ func (m *GroupControllerGetCapabilitiesRequest) Reset()         { *m = GroupCont
 func (m *GroupControllerGetCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*GroupControllerGetCapabilitiesRequest) ProtoMessage()    {}
 func (*GroupControllerGetCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{60}
+	return fileDescriptor_9cdb00adce470e01, []int{62}
 }
 
 func (m *GroupControllerGetCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
@@ -5020,7 +5157,7 @@ func (m *GroupControllerGetCapabilitiesResponse) Reset() {
 func (m *GroupControllerGetCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*GroupControllerGetCapabilitiesResponse) ProtoMessage()    {}
 func (*GroupControllerGetCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{61}
+	return fileDescriptor_9cdb00adce470e01, []int{63}
 }
 
 func (m *GroupControllerGetCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
@@ -5063,7 +5200,7 @@ func (m *GroupControllerServiceCapability) Reset()         { *m = GroupControlle
 func (m *GroupControllerServiceCapability) String() string { return proto.CompactTextString(m) }
 func (*GroupControllerServiceCapability) ProtoMessage()    {}
 func (*GroupControllerServiceCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{62}
+	return fileDescriptor_9cdb00adce470e01, []int{64}
 }
 
 func (m *GroupControllerServiceCapability) XXX_Unmarshal(b []byte) error {
@@ -5126,7 +5263,7 @@ func (m *GroupControllerServiceCapability_RPC) Reset()         { *m = GroupContr
 func (m *GroupControllerServiceCapability_RPC) String() string { return proto.CompactTextString(m) }
 func (*GroupControllerServiceCapability_RPC) ProtoMessage()    {}
 func (*GroupControllerServiceCapability_RPC) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{62, 0}
+	return fileDescriptor_9cdb00adce470e01, []int{64, 0}
 }
 
 func (m *GroupControllerServiceCapability_RPC) XXX_Unmarshal(b []byte) error {
@@ -5185,7 +5322,7 @@ func (m *CreateVolumeGroupSnapshotRequest) Reset()         { *m = CreateVolumeGr
 func (m *CreateVolumeGroupSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*CreateVolumeGroupSnapshotRequest) ProtoMessage()    {}
 func (*CreateVolumeGroupSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{63}
+	return fileDescriptor_9cdb00adce470e01, []int{65}
 }
 
 func (m *CreateVolumeGroupSnapshotRequest) XXX_Unmarshal(b []byte) error {
@@ -5247,7 +5384,7 @@ func (m *CreateVolumeGroupSnapshotResponse) Reset()         { *m = CreateVolumeG
 func (m *CreateVolumeGroupSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*CreateVolumeGroupSnapshotResponse) ProtoMessage()    {}
 func (*CreateVolumeGroupSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{64}
+	return fileDescriptor_9cdb00adce470e01, []int{66}
 }
 
 func (m *CreateVolumeGroupSnapshotResponse) XXX_Unmarshal(b []byte) error {
@@ -5311,7 +5448,7 @@ func (m *VolumeGroupSnapshot) Reset()         { *m = VolumeGroupSnapshot{} }
 func (m *VolumeGroupSnapshot) String() string { return proto.CompactTextString(m) }
 func (*VolumeGroupSnapshot) ProtoMessage()    {}
 func (*VolumeGroupSnapshot) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{65}
+	return fileDescriptor_9cdb00adce470e01, []int{67}
 }
 
 func (m *VolumeGroupSnapshot) XXX_Unmarshal(b []byte) error {
@@ -5390,7 +5527,7 @@ func (m *DeleteVolumeGroupSnapshotRequest) Reset()         { *m = DeleteVolumeGr
 func (m *DeleteVolumeGroupSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteVolumeGroupSnapshotRequest) ProtoMessage()    {}
 func (*DeleteVolumeGroupSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{66}
+	return fileDescriptor_9cdb00adce470e01, []int{68}
 }
 
 func (m *DeleteVolumeGroupSnapshotRequest) XXX_Unmarshal(b []byte) error {
@@ -5442,7 +5579,7 @@ func (m *DeleteVolumeGroupSnapshotResponse) Reset()         { *m = DeleteVolumeG
 func (m *DeleteVolumeGroupSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*DeleteVolumeGroupSnapshotResponse) ProtoMessage()    {}
 func (*DeleteVolumeGroupSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{67}
+	return fileDescriptor_9cdb00adce470e01, []int{69}
 }
 
 func (m *DeleteVolumeGroupSnapshotResponse) XXX_Unmarshal(b []byte) error {
@@ -5494,7 +5631,7 @@ func (m *GetVolumeGroupSnapshotRequest) Reset()         { *m = GetVolumeGroupSna
 func (m *GetVolumeGroupSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*GetVolumeGroupSnapshotRequest) ProtoMessage()    {}
 func (*GetVolumeGroupSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{68}
+	return fileDescriptor_9cdb00adce470e01, []int{70}
 }
 
 func (m *GetVolumeGroupSnapshotRequest) XXX_Unmarshal(b []byte) error {
@@ -5548,7 +5685,7 @@ func (m *GetVolumeGroupSnapshotResponse) Reset()         { *m = GetVolumeGroupSn
 func (m *GetVolumeGroupSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*GetVolumeGroupSnapshotResponse) ProtoMessage()    {}
 func (*GetVolumeGroupSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_9cdb00adce470e01, []int{69}
+	return fileDescriptor_9cdb00adce470e01, []int{71}
 }
 
 func (m *GetVolumeGroupSnapshotResponse) XXX_Unmarshal(b []byte) error {
@@ -5658,6 +5795,7 @@ func init() {
 	proto.RegisterType((*ProbeRequest)(nil), "csi.v1.ProbeRequest")
 	proto.RegisterType((*ProbeResponse)(nil), "csi.v1.ProbeResponse")
 	proto.RegisterType((*CreateVolumeRequest)(nil), "csi.v1.CreateVolumeRequest")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v1.CreateVolumeRequest.MutableParametersEntry")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.CreateVolumeRequest.ParametersEntry")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.CreateVolumeRequest.SecretsEntry")
 	proto.RegisterType((*VolumeContentSource)(nil), "csi.v1.VolumeContentSource")
@@ -5686,11 +5824,13 @@ func init() {
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ControllerUnpublishVolumeRequest.SecretsEntry")
 	proto.RegisterType((*ControllerUnpublishVolumeResponse)(nil), "csi.v1.ControllerUnpublishVolumeResponse")
 	proto.RegisterType((*ValidateVolumeCapabilitiesRequest)(nil), "csi.v1.ValidateVolumeCapabilitiesRequest")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ValidateVolumeCapabilitiesRequest.MutableParametersEntry")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ValidateVolumeCapabilitiesRequest.ParametersEntry")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ValidateVolumeCapabilitiesRequest.SecretsEntry")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ValidateVolumeCapabilitiesRequest.VolumeContextEntry")
 	proto.RegisterType((*ValidateVolumeCapabilitiesResponse)(nil), "csi.v1.ValidateVolumeCapabilitiesResponse")
 	proto.RegisterType((*ValidateVolumeCapabilitiesResponse_Confirmed)(nil), "csi.v1.ValidateVolumeCapabilitiesResponse.Confirmed")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ValidateVolumeCapabilitiesResponse.Confirmed.MutableParametersEntry")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ValidateVolumeCapabilitiesResponse.Confirmed.ParametersEntry")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ValidateVolumeCapabilitiesResponse.Confirmed.VolumeContextEntry")
 	proto.RegisterType((*ListVolumesRequest)(nil), "csi.v1.ListVolumesRequest")
@@ -5700,6 +5840,10 @@ func init() {
 	proto.RegisterType((*ControllerGetVolumeRequest)(nil), "csi.v1.ControllerGetVolumeRequest")
 	proto.RegisterType((*ControllerGetVolumeResponse)(nil), "csi.v1.ControllerGetVolumeResponse")
 	proto.RegisterType((*ControllerGetVolumeResponse_VolumeStatus)(nil), "csi.v1.ControllerGetVolumeResponse.VolumeStatus")
+	proto.RegisterType((*ControllerModifyVolumeRequest)(nil), "csi.v1.ControllerModifyVolumeRequest")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ControllerModifyVolumeRequest.MutableParametersEntry")
+	proto.RegisterMapType((map[string]string)(nil), "csi.v1.ControllerModifyVolumeRequest.SecretsEntry")
+	proto.RegisterType((*ControllerModifyVolumeResponse)(nil), "csi.v1.ControllerModifyVolumeResponse")
 	proto.RegisterType((*GetCapacityRequest)(nil), "csi.v1.GetCapacityRequest")
 	proto.RegisterMapType((map[string]string)(nil), "csi.v1.GetCapacityRequest.ParametersEntry")
 	proto.RegisterType((*GetCapacityResponse)(nil), "csi.v1.GetCapacityResponse")
@@ -5778,269 +5922,278 @@ func init() {
 }
 
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+	0xd3, 0xb2, 0x75, 0x92, 0x7d, 0x6c, 0x7e, 0x13, 0x66, 0x88, 0x30, 0xc7, 0x2e, 0xdc, 0x30, 0x7c,
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+	0xc4, 0x3e, 0x99, 0x09, 0x11, 0x99, 0xc5, 0x68, 0x74, 0x6e, 0xb3, 0x0c, 0xb3, 0x1e, 0x19, 0xe7,
+	0xb9, 0xd9, 0x46, 0x2b, 0x1c, 0x2a, 0xee, 0x44, 0x88, 0xc8, 0x0c, 0x25, 0xe2, 0x4e, 0x0d, 0x44,
+	0xf1, 0xfe, 0xf7, 0xa0, 0xa8, 0x28, 0xb4, 0x86, 0xc5, 0x15, 0x85, 0xce, 0x95, 0xb3, 0xcf, 0xd2,
+	0x2d, 0x5b, 0x3f, 0xca, 0x61, 0xa4, 0xaf, 0xfd, 0x6f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x9c, 0x41,
+	0x84, 0x14, 0xea, 0x4a, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -6212,6 +6365,7 @@ type ControllerClient interface {
 	ListSnapshots(ctx context.Context, in *ListSnapshotsRequest, opts ...grpc.CallOption) (*ListSnapshotsResponse, error)
 	ControllerExpandVolume(ctx context.Context, in *ControllerExpandVolumeRequest, opts ...grpc.CallOption) (*ControllerExpandVolumeResponse, error)
 	ControllerGetVolume(ctx context.Context, in *ControllerGetVolumeRequest, opts ...grpc.CallOption) (*ControllerGetVolumeResponse, error)
+	ControllerModifyVolume(ctx context.Context, in *ControllerModifyVolumeRequest, opts ...grpc.CallOption) (*ControllerModifyVolumeResponse, error)
 }
 
 type controllerClient struct {
@@ -6339,6 +6493,15 @@ func (c *controllerClient) ControllerGetVolume(ctx context.Context, in *Controll
 	return out, nil
 }
 
+func (c *controllerClient) ControllerModifyVolume(ctx context.Context, in *ControllerModifyVolumeRequest, opts ...grpc.CallOption) (*ControllerModifyVolumeResponse, error) {
+	out := new(ControllerModifyVolumeResponse)
+	err := c.cc.Invoke(ctx, "/csi.v1.Controller/ControllerModifyVolume", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // ControllerServer is the server API for Controller service.
 type ControllerServer interface {
 	CreateVolume(context.Context, *CreateVolumeRequest) (*CreateVolumeResponse, error)
@@ -6354,6 +6517,7 @@ type ControllerServer interface {
 	ListSnapshots(context.Context, *ListSnapshotsRequest) (*ListSnapshotsResponse, error)
 	ControllerExpandVolume(context.Context, *ControllerExpandVolumeRequest) (*ControllerExpandVolumeResponse, error)
 	ControllerGetVolume(context.Context, *ControllerGetVolumeRequest) (*ControllerGetVolumeResponse, error)
+	ControllerModifyVolume(context.Context, *ControllerModifyVolumeRequest) (*ControllerModifyVolumeResponse, error)
 }
 
 // UnimplementedControllerServer can be embedded to have forward compatible implementations.
@@ -6399,6 +6563,9 @@ func (*UnimplementedControllerServer) ControllerExpandVolume(ctx context.Context
 func (*UnimplementedControllerServer) ControllerGetVolume(ctx context.Context, req *ControllerGetVolumeRequest) (*ControllerGetVolumeResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ControllerGetVolume not implemented")
 }
+func (*UnimplementedControllerServer) ControllerModifyVolume(ctx context.Context, req *ControllerModifyVolumeRequest) (*ControllerModifyVolumeResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ControllerModifyVolume not implemented")
+}
 
 func RegisterControllerServer(s *grpc.Server, srv ControllerServer) {
 	s.RegisterService(&_Controller_serviceDesc, srv)
@@ -6638,6 +6805,24 @@ func _Controller_ControllerGetVolume_Handler(srv interface{}, ctx context.Contex
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Controller_ControllerModifyVolume_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ControllerModifyVolumeRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ControllerServer).ControllerModifyVolume(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/csi.v1.Controller/ControllerModifyVolume",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ControllerServer).ControllerModifyVolume(ctx, req.(*ControllerModifyVolumeRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Controller_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "csi.v1.Controller",
 	HandlerType: (*ControllerServer)(nil),
@@ -6694,6 +6879,10 @@ var _Controller_serviceDesc = grpc.ServiceDesc{
 			MethodName: "ControllerGetVolume",
 			Handler:    _Controller_ControllerGetVolume_Handler,
 		},
+		{
+			MethodName: "ControllerModifyVolume",
+			Handler:    _Controller_ControllerModifyVolume_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "github.com/container-storage-interface/spec/csi.proto",
diff --git a/spec.md b/spec.md
index f16e8a47..c8ec7d86 100644
--- a/spec.md
+++ b/spec.md
@@ -381,6 +381,11 @@ service Controller {
     returns (ControllerGetVolumeResponse) {
         option (alpha_method) = true;
     }
+
+  rpc ControllerModifyVolume (ControllerModifyVolumeRequest)
+    returns (ControllerModifyVolumeResponse) {
+        option (alpha_method) = true;
+    }
 }
 
 service GroupController {
@@ -752,7 +757,11 @@ A Controller Plugin MUST implement this RPC call if it has `CREATE_DELETE_VOLUME
 This RPC will be called by the CO to provision a new volume on behalf of a user (to be consumed as either a block device or a mounted filesystem).
 
 This operation MUST be idempotent.
-If a volume corresponding to the specified volume `name` already exists, is accessible from `accessibility_requirements`, and is compatible with the specified `capacity_range`, `volume_capabilities` and `parameters` in the `CreateVolumeRequest`, the Plugin MUST reply `0 OK` with the corresponding `CreateVolumeResponse`.
+If a volume corresponding to the specified volume `name` already exists, is accessible from `accessibility_requirements`, and is compatible with the specified `capacity_range`, `volume_capabilities`, `parameters` and `mutable_parameters` in the `CreateVolumeRequest`, the Plugin MUST reply `0 OK` with the corresponding `CreateVolumeResponse`.
+
+The `parameters` field SHALL contain opaque volume attributes to be specified at creation time. 
+The `mutable_parameters` field SHALL contain opaque volume attributes that are defined at creation time but MAY also be changed during the lifetime of the volume via a subsequent `ControllerModifyVolume` RPC. 
+Values specified in `mutable_parameters` SHOULD take precedence over the values from `parameters`.
 
 Plugins MAY create 3 types of volumes:
 
@@ -817,9 +826,10 @@ message CreateVolumeRequest {
   // This field is REQUIRED.
   repeated VolumeCapability volume_capabilities = 3;
 
-  // Plugin specific parameters passed in as opaque key-value pairs.
-  // This field is OPTIONAL. The Plugin is responsible for parsing and
-  // validating these parameters. COs will treat these as opaque.
+  // Plugin specific creation-time parameters passed in as opaque 
+  // key-value pairs. This field is OPTIONAL. The Plugin is responsible 
+  // for parsing and validating these parameters. COs will treat 
+  // these as opaque.
   map<string, string> parameters = 4;
 
   // Secrets required by plugin to complete volume creation request.
@@ -843,6 +853,13 @@ message CreateVolumeRequest {
   // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
   // choose where the provisioned volume is accessible from.
   TopologyRequirement accessibility_requirements = 7;
+
+  // Plugin specific mutable parameters passed in as opaque key-value
+  // pairs. This field is OPTIONAL. The Plugin is responsible for 
+  // parsing and validating these parameters. COs will treat these 
+  // as opaque. Plugins SHOULD treat these as if they take precedence 
+  // over the parameters field.
+  map<string, string> mutable_parameters = 8 [(alpha_field) = true];
 }
 
 // Specifies what source the volume will be created from. One of the
@@ -1433,6 +1450,10 @@ message ValidateVolumeCapabilitiesRequest {
   // This field is OPTIONAL. Refer to the `Secrets Requirements`
   // section on how to use this field.
   map<string, string> secrets = 5 [(csi_secret) = true];
+
+  // See CreateVolumeRequest.mutable_parameters.
+  // This field is OPTIONAL.
+  map<string, string> mutable_parameters = 6;
 }
 
 message ValidateVolumeCapabilitiesResponse {
@@ -1448,6 +1469,10 @@ message ValidateVolumeCapabilitiesResponse {
     // The volume creation parameters validated by the plugin.
     // This field is OPTIONAL.
     map<string, string> parameters = 3;
+
+    // The volume creation mutable_parameters validated by the plugin.
+    // This field is OPTIONAL.
+    map<string, string> mutable_parameters = 4;
   }
 
   // Confirmed indicates to the CO the set of capabilities that the
@@ -1617,6 +1642,53 @@ The CO MUST implement the specified error recovery behavior when it encounters t
 |-----------|-----------|-------------|-------------------|
 | Volume does not exist | 5 NOT_FOUND | Indicates that a volume corresponding to the specified `volume_id` does not exist. | Caller MUST verify that the `volume_id` is correct and that the volume is accessible and has not been deleted before retrying with exponential back off. |
 
+
+#### `ControllerModifyVolume`
+
+A Controller plugin MUST implement this RPC call if plugin has MODIFY_VOLUME controller capability.
+This RPC allows the CO to change mutable key attributes of a volume. 
+
+This operation MUST be idempotent. 
+The new mutable parameters in ControllerModifyVolume can be different from the existing mutable parameters. 
+
+
+```protobuf
+message ControllerModifyVolumeRequest {
+  option (alpha_message) = true;
+
+  // Contains identity information for the existing volume.
+  // This field is REQUIRED.
+  string volume_id = 1;
+
+  // Secrets required by plugin to complete modify volume request.
+  // This field is OPTIONAL. Refer to the `Secrets Requirements`
+  // section on how to use this field.
+  map<string, string> secrets = 2 [(csi_secret) = true];
+
+  // Plugin specific parameters to apply, passed in as opaque key-value
+  // pairs. This field is OPTIONAL. The Plugin is responsible for
+  // parsing and validating these parameters. COs will treat these
+  // as opaque. COs MUST specify the intended value of every mutable
+  // parameter. Absent keys that were previously assigned a value MUST
+  // be interpreted as a deletion of the key from the set of mutable
+  // parameters.
+  map<string, string> mutable_parameters = 3;
+}
+
+message ControllerModifyVolumeResponse {
+  option (alpha_message) = true;
+}
+
+```
+
+##### ControllerModifyVolume Errors
+
+| Condition | gRPC Code | Description | Recovery Behavior |
+|-----------|-----------|-------------|-------------------|
+| Parameters not supported | 3 INVALID_ARGUMENT | Indicates that the CO has specified mutable parameters not supported by the volume. | Caller MAY verify mutable parameters. |
+| Exceeds capabilities | 3 INVALID_ARGUMENT | Indicates that the CO has specified capabilities not supported by the volume. | Caller MAY verify volume capabilities by calling ValidateVolumeCapabilities and retry with matching capabilities. |
+| Volume does not exist | 5 NOT FOUND | Indicates that a volume corresponding to the specified volume_id does not exist. | Caller MUST verify that the volume_id is correct and that the volume is accessible and has not been deleted before retrying with exponential back off. |
+
 #### `GetCapacity`
 
 A Controller Plugin MUST implement this RPC call if it has `GET_CAPACITY` controller capability.
@@ -1773,6 +1845,10 @@ 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 ControllerModifyVolume for details.
+      MODIFY_VOLUME = 14 [(alpha_enum_value) = true];
     }
 
     Type type = 1;