From 6a42454b5d243e0504a5b0ca11a9f1e3ec5c0095 Mon Sep 17 00:00:00 2001
From: James DeFelice <james@mesosphere.io>
Date: Mon, 30 Oct 2017 15:36:32 +0000
Subject: [PATCH] spec: use official proto wrappers for primitive fields

---
 csi.proto            |  66 ++---
 lib/go/Makefile      |  15 +-
 lib/go/csi/csi.pb.go | 606 ++++++++++++++++++++++---------------------
 spec.md              |  66 ++---
 4 files changed, 389 insertions(+), 364 deletions(-)

diff --git a/csi.proto b/csi.proto
index 6900868d..7c533c29 100644
--- a/csi.proto
+++ b/csi.proto
@@ -1,6 +1,8 @@
 ////////
 syntax = "proto3";
 package csi;
+
+import "google/protobuf/wrappers.proto";
 ////////
 ////////
 service Identity {
@@ -75,9 +77,9 @@ message GetSupportedVersionsResponse {
 // Specifies a version in Semantic Version 2.0 format.
 // (http://semver.org/spec/v2.0.0.html)
 message Version {
-  uint32 major = 1;  // This field is REQUIRED.
-  uint32 minor = 2;  // This field is REQUIRED.
-  uint32 patch = 3;  // This field is REQUIRED.
+  .google.protobuf.UInt32Value major = 1;  // This field is REQUIRED.
+  .google.protobuf.UInt32Value minor = 2;  // This field is REQUIRED.
+  .google.protobuf.UInt32Value patch = 3;  // This field is REQUIRED.
 }
 ////////
 ////////
@@ -89,10 +91,10 @@ message GetPluginInfoRequest {
 message GetPluginInfoResponse {
   message Result {
     // This field is REQUIRED.
-    string name = 1;
+    .google.protobuf.StringValue name = 1;
 
     // This field is REQUIRED. Value of this field is opaque to the CO.
-    string vendor_version = 2;
+    .google.protobuf.StringValue vendor_version = 2;
 
     // This field is OPTIONAL. Values are opaque to the CO.
     map<string, string> manifest = 3;
@@ -125,7 +127,7 @@ message CreateVolumeRequest {
   //    an identifier by which to refer to the newly provisioned
   //    storage. If a storage system supports this, it can optionally
   //    use this name as the identifier for the new volume.
-  string name = 2;
+  .google.protobuf.StringValue name = 2;
 
   // This field is OPTIONAL. This allows the CO to specify the capacity
   // requirement of the volume to be provisioned. If not specified, the
@@ -178,7 +180,7 @@ message VolumeCapability {
   // Indicate that the volume will be accessed via the filesystem API.
   message MountVolume {
     // The filesystem type. This field is OPTIONAL.
-    string fs_type = 1;
+    .google.protobuf.StringValue fs_type = 1;
 
     // The mount options that can be used for the volume. This field is
     // OPTIONAL. `mount_flags` MAY contain sensitive information.
@@ -230,10 +232,10 @@ message VolumeCapability {
 // least one of the these fields MUST be specified.
 message CapacityRange {
   // Volume must be at least this big.
-  uint64 required_bytes = 1;
+  .google.protobuf.UInt64Value required_bytes = 1;
 
   // Volume must not be bigger than this.
-  uint64 limit_bytes = 2;
+  .google.protobuf.UInt64Value limit_bytes = 2;
 }
 
 // The information about a provisioned volume.
@@ -241,7 +243,7 @@ message VolumeInfo {
   // The capacity of the volume in bytes. This field is OPTIONAL. If not
   // set, it indicates that the capacity of the volume is unknown (e.g.,
   // NFS share). If set, it MUST be non-zero.
-  uint64 capacity_bytes = 1;
+  .google.protobuf.UInt64Value capacity_bytes = 1;
 
   // Contains identity information for the created volume. This field is
   // REQUIRED. The identity information will be used by the CO in
@@ -263,7 +265,7 @@ message VolumeHandle {
   // Plugin. This field is REQUIRED.
   // This information SHALL NOT be considered sensitive such that, for
   // example, the CO MAY generate log messages that include this data.
-  string id = 1;
+  .google.protobuf.StringValue id = 1;
 
   // Metadata captures additional, possibly sensitive, information about
   // a volume in the form of key-value pairs. This field is OPTIONAL.
@@ -333,7 +335,7 @@ message ControllerPublishVolumeRequest {
 
   // Whether to publish the volume in readonly mode. This field is
   // REQUIRED.
-  bool readonly = 5;
+  .google.protobuf.BoolValue readonly = 5;
 
   // End user credentials used to authenticate/authorize controller
   // publish request.
@@ -418,11 +420,11 @@ message ValidateVolumeCapabilitiesResponse {
   message Result {
     // True if the Plugin supports the specified capabilities for the
     // given volume. This field is REQUIRED.
-    bool supported = 1;
+    .google.protobuf.BoolValue supported = 1;
 
     // Message to the CO if `supported` above is false. This field is
     // OPTIONAL.
-    string message = 2;
+    .google.protobuf.StringValue message = 2;
   }
 
   // One of the following fields MUST be specified.
@@ -444,12 +446,12 @@ message ListVolumesRequest {
   // `ListVolumes` call. This field is OPTIONAL. If not specified, it
   // means there is no restriction on the number of entries that can be
   // returned.
-  uint32 max_entries = 2;
+  .google.protobuf.UInt32Value max_entries = 2;
 
   // A token to specify where to start paginating. Set this field to
   // `next_token` returned by a previous `ListVolumes` call to get the
   // next page of entries. This field is OPTIONAL.
-  string starting_token = 3;
+  .google.protobuf.StringValue starting_token = 3;
 }
 
 message ListVolumesResponse {
@@ -465,7 +467,7 @@ message ListVolumesResponse {
     // `max_entries`, use the `next_token` as a value for the
     // `starting_token` field in the next `ListVolumes` request. This
     // field is OPTIONAL.
-    string next_token = 2;
+    .google.protobuf.StringValue next_token = 2;
   }
 
   // One of the following fields MUST be specified.
@@ -501,7 +503,7 @@ message GetCapacityResponse {
     // specified in the request, the Plugin SHALL take those into
     // consideration when calculating the available capacity of the
     // storage. This field is REQUIRED.
-    uint64 available_capacity = 1;
+    .google.protobuf.UInt64Value available_capacity = 1;
   }
 
   // One of the following fields MUST be specified.
@@ -570,7 +572,7 @@ message NodePublishVolumeRequest {
   // absolute path in the root filesystem of the process serving this
   // request. The CO SHALL ensure uniqueness of target_path per volume.
   // This is a REQUIRED field.
-  string target_path = 4;
+  .google.protobuf.StringValue target_path = 4;
 
   // The capability of the volume the CO expects the volume to have.
   // This is a REQUIRED field.
@@ -578,7 +580,7 @@ message NodePublishVolumeRequest {
 
   // Whether to publish the volume in readonly mode. This field is
   // REQUIRED.
-  bool readonly = 6;
+  .google.protobuf.BoolValue readonly = 6;
 
   // End user credentials used to authenticate/authorize node publish
   // request. This field is OPTIONAL.
@@ -606,7 +608,7 @@ message NodeUnpublishVolumeRequest {
   // The path at which the volume was published. It MUST be an absolute
   // path in the root filesystem of the process serving this request.
   // This is a REQUIRED field.
-  string target_path = 3;
+  .google.protobuf.StringValue target_path = 3;
 
   // End user credentials used to authenticate/authorize node unpublish
   // request. This field is OPTIONAL.
@@ -749,11 +751,11 @@ message Error {
     // will cause it to succeed. If this value is false, the caller MAY
     // reissue the same call, but SHOULD implement exponential backoff
     // on retires.
-    bool caller_must_not_retry = 2;
+    .google.protobuf.BoolValue caller_must_not_retry = 2;
 
     // Human readable description of error, possibly with additional
     // information. This string MAY be surfaced by CO to end users.
-    string error_description = 3;
+    .google.protobuf.StringValue error_description = 3;
   }
 
   // `CreateVolume` specific error.
@@ -838,7 +840,7 @@ message Error {
 
     // Human readable description of error, possibly with additional
     // information. This string maybe surfaced by CO to end users.
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `DeleteVolume` specific error.
@@ -897,7 +899,7 @@ message Error {
 
     // Human readable description of error, possibly with additional
     // information. This string maybe surfaced by CO to end users.
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `ControllerPublishVolume` specific error.
@@ -1004,7 +1006,7 @@ message Error {
 
     // Human readable description of error, possibly with additional
     // information. This string maybe surfaced by CO to end users.
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
 
     // On `VOLUME_ALREADY_ATTACHED` and `MAX_ATTACHED_NODES` errors,
     // this field contains the node(s) that the specified volume is
@@ -1091,7 +1093,7 @@ message Error {
     }
 
     ControllerUnpublishVolumeErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `ValidateVolumeCapabilities` specific error.
@@ -1129,7 +1131,7 @@ message Error {
     }
 
     ValidateVolumeCapabilitiesErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `NodePublishVolume` specific error.
@@ -1183,7 +1185,7 @@ message Error {
     }
 
     NodePublishVolumeErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `NodeUnpublishVolume` specific error.
@@ -1234,7 +1236,7 @@ message Error {
     }
 
     NodeUnpublishVolumeErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `ProbeNode` specific error.
@@ -1255,7 +1257,7 @@ message Error {
     }
 
     ProbeNodeErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `GetNodeID` specific error.
@@ -1275,7 +1277,7 @@ message Error {
     }
 
     GetNodeIDErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // One of the following fields MUST be specified.
diff --git a/lib/go/Makefile b/lib/go/Makefile
index d7a70e6d..cd34eb73 100644
--- a/lib/go/Makefile
+++ b/lib/go/Makefile
@@ -79,12 +79,25 @@ export PATH := $(shell pwd):$(PATH)
 CSI_GO := csi/csi.pb.go
 CSI_A := csi.a
 CSI_PROTO := ../../csi.proto
+CSI_PROTO_TMP := csi/.build/csi.proto
 CSI_GO_TMP := csi/.build/csi.pb.go
 
 # This recipe generates the go language bindings to a temp area.
+#
+# `sed` is used because the standard protobuf wrapper types actually
+# alias the golang package for this, so we need to swap this out before
+# attempting to use the golang plugin for protoc.
+#
+$(CSI_GO_TMP): STDWRAP = google/protobuf/wrappers.proto
+$(CSI_GO_TMP): GOWRAP_PKG = github.com/golang/protobuf/ptypes/wrappers
+$(CSI_GO_TMP): GOWRAP = $(STDWRAP:%.proto=$(GOWRAP_PKG)/wrappers.proto)
+$(CSI_GO_TMP): PROTO_REWRITES = -e 's@"$(STDWRAP)"@"$(GOWRAP)"@g'
 $(CSI_GO_TMP): $(CSI_PROTO) | $(PROTOC) $(PROTOC_GEN_GO)
 	@mkdir -p "$(@D)"
-	$(PROTOC) -I "$(<D)" --go_out=plugins=grpc:"$(@D)" "$<"
+	cat "$<" | sed $(PROTO_REWRITES) >"$(CSI_PROTO_TMP)"
+	$(PROTOC) -I "$(@D)" \
+		-I$(GOPATH)/src --go_out=plugins=grpc:"$(@D)" \
+		"$(CSI_PROTO_TMP)"
 
 # The temp language bindings are compared to the ones that are
 # versioned. If they are different then it means the language
diff --git a/lib/go/csi/csi.pb.go b/lib/go/csi/csi.pb.go
index efc2abcc..3f9fa7c9 100644
--- a/lib/go/csi/csi.pb.go
+++ b/lib/go/csi/csi.pb.go
@@ -54,6 +54,7 @@ package csi
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
+import google_protobuf "github.com/golang/protobuf/ptypes/wrappers"
 
 import (
 	context "golang.org/x/net/context"
@@ -1033,9 +1034,9 @@ func (m *GetSupportedVersionsResponse_Result) GetSupportedVersions() []*Version
 // Specifies a version in Semantic Version 2.0 format.
 // (http://semver.org/spec/v2.0.0.html)
 type Version struct {
-	Major uint32 `protobuf:"varint,1,opt,name=major" json:"major,omitempty"`
-	Minor uint32 `protobuf:"varint,2,opt,name=minor" json:"minor,omitempty"`
-	Patch uint32 `protobuf:"varint,3,opt,name=patch" json:"patch,omitempty"`
+	Major *google_protobuf.UInt32Value `protobuf:"bytes,1,opt,name=major" json:"major,omitempty"`
+	Minor *google_protobuf.UInt32Value `protobuf:"bytes,2,opt,name=minor" json:"minor,omitempty"`
+	Patch *google_protobuf.UInt32Value `protobuf:"bytes,3,opt,name=patch" json:"patch,omitempty"`
 }
 
 func (m *Version) Reset()                    { *m = Version{} }
@@ -1043,25 +1044,25 @@ func (m *Version) String() string            { return proto.CompactTextString(m)
 func (*Version) ProtoMessage()               {}
 func (*Version) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{2} }
 
-func (m *Version) GetMajor() uint32 {
+func (m *Version) GetMajor() *google_protobuf.UInt32Value {
 	if m != nil {
 		return m.Major
 	}
-	return 0
+	return nil
 }
 
-func (m *Version) GetMinor() uint32 {
+func (m *Version) GetMinor() *google_protobuf.UInt32Value {
 	if m != nil {
 		return m.Minor
 	}
-	return 0
+	return nil
 }
 
-func (m *Version) GetPatch() uint32 {
+func (m *Version) GetPatch() *google_protobuf.UInt32Value {
 	if m != nil {
 		return m.Patch
 	}
-	return 0
+	return nil
 }
 
 // //////
@@ -1208,9 +1209,9 @@ func _GetPluginInfoResponse_OneofSizer(msg proto.Message) (n int) {
 
 type GetPluginInfoResponse_Result struct {
 	// This field is REQUIRED.
-	Name string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Name *google_protobuf.StringValue `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
 	// This field is REQUIRED. Value of this field is opaque to the CO.
-	VendorVersion string `protobuf:"bytes,2,opt,name=vendor_version,json=vendorVersion" json:"vendor_version,omitempty"`
+	VendorVersion *google_protobuf.StringValue `protobuf:"bytes,2,opt,name=vendor_version,json=vendorVersion" json:"vendor_version,omitempty"`
 	// This field is OPTIONAL. Values are opaque to the CO.
 	Manifest map[string]string `protobuf:"bytes,3,rep,name=manifest" json:"manifest,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
 }
@@ -1220,18 +1221,18 @@ func (m *GetPluginInfoResponse_Result) String() string            { return proto
 func (*GetPluginInfoResponse_Result) ProtoMessage()               {}
 func (*GetPluginInfoResponse_Result) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{4, 0} }
 
-func (m *GetPluginInfoResponse_Result) GetName() string {
+func (m *GetPluginInfoResponse_Result) GetName() *google_protobuf.StringValue {
 	if m != nil {
 		return m.Name
 	}
-	return ""
+	return nil
 }
 
-func (m *GetPluginInfoResponse_Result) GetVendorVersion() string {
+func (m *GetPluginInfoResponse_Result) GetVendorVersion() *google_protobuf.StringValue {
 	if m != nil {
 		return m.VendorVersion
 	}
-	return ""
+	return nil
 }
 
 func (m *GetPluginInfoResponse_Result) GetManifest() map[string]string {
@@ -1261,7 +1262,7 @@ type CreateVolumeRequest struct {
 	//    an identifier by which to refer to the newly provisioned
 	//    storage. If a storage system supports this, it can optionally
 	//    use this name as the identifier for the new volume.
-	Name string `protobuf:"bytes,2,opt,name=name" json:"name,omitempty"`
+	Name *google_protobuf.StringValue `protobuf:"bytes,2,opt,name=name" json:"name,omitempty"`
 	// This field is OPTIONAL. This allows the CO to specify the capacity
 	// requirement of the volume to be provisioned. If not specified, the
 	// Plugin MAY choose an implementation-defined capacity range.
@@ -1297,11 +1298,11 @@ func (m *CreateVolumeRequest) GetVersion() *Version {
 	return nil
 }
 
-func (m *CreateVolumeRequest) GetName() string {
+func (m *CreateVolumeRequest) GetName() *google_protobuf.StringValue {
 	if m != nil {
 		return m.Name
 	}
-	return ""
+	return nil
 }
 
 func (m *CreateVolumeRequest) GetCapacityRange() *CapacityRange {
@@ -1620,7 +1621,7 @@ func (*VolumeCapability_BlockVolume) Descriptor() ([]byte, []int) { return fileD
 // Indicate that the volume will be accessed via the filesystem API.
 type VolumeCapability_MountVolume struct {
 	// The filesystem type. This field is OPTIONAL.
-	FsType string `protobuf:"bytes,1,opt,name=fs_type,json=fsType" json:"fs_type,omitempty"`
+	FsType *google_protobuf.StringValue `protobuf:"bytes,1,opt,name=fs_type,json=fsType" json:"fs_type,omitempty"`
 	// The mount options that can be used for the volume. This field is
 	// OPTIONAL. `mount_flags` MAY contain sensitive information.
 	// Therefore, the CO and the Plugin MUST NOT leak this information
@@ -1633,11 +1634,11 @@ func (m *VolumeCapability_MountVolume) String() string            { return proto
 func (*VolumeCapability_MountVolume) ProtoMessage()               {}
 func (*VolumeCapability_MountVolume) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{7, 1} }
 
-func (m *VolumeCapability_MountVolume) GetFsType() string {
+func (m *VolumeCapability_MountVolume) GetFsType() *google_protobuf.StringValue {
 	if m != nil {
 		return m.FsType
 	}
-	return ""
+	return nil
 }
 
 func (m *VolumeCapability_MountVolume) GetMountFlags() []string {
@@ -1670,9 +1671,9 @@ func (m *VolumeCapability_AccessMode) GetMode() VolumeCapability_AccessMode_Mode
 // least one of the these fields MUST be specified.
 type CapacityRange struct {
 	// Volume must be at least this big.
-	RequiredBytes uint64 `protobuf:"varint,1,opt,name=required_bytes,json=requiredBytes" json:"required_bytes,omitempty"`
+	RequiredBytes *google_protobuf.UInt64Value `protobuf:"bytes,1,opt,name=required_bytes,json=requiredBytes" json:"required_bytes,omitempty"`
 	// Volume must not be bigger than this.
-	LimitBytes uint64 `protobuf:"varint,2,opt,name=limit_bytes,json=limitBytes" json:"limit_bytes,omitempty"`
+	LimitBytes *google_protobuf.UInt64Value `protobuf:"bytes,2,opt,name=limit_bytes,json=limitBytes" json:"limit_bytes,omitempty"`
 }
 
 func (m *CapacityRange) Reset()                    { *m = CapacityRange{} }
@@ -1680,18 +1681,18 @@ func (m *CapacityRange) String() string            { return proto.CompactTextStr
 func (*CapacityRange) ProtoMessage()               {}
 func (*CapacityRange) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{8} }
 
-func (m *CapacityRange) GetRequiredBytes() uint64 {
+func (m *CapacityRange) GetRequiredBytes() *google_protobuf.UInt64Value {
 	if m != nil {
 		return m.RequiredBytes
 	}
-	return 0
+	return nil
 }
 
-func (m *CapacityRange) GetLimitBytes() uint64 {
+func (m *CapacityRange) GetLimitBytes() *google_protobuf.UInt64Value {
 	if m != nil {
 		return m.LimitBytes
 	}
-	return 0
+	return nil
 }
 
 // The information about a provisioned volume.
@@ -1699,7 +1700,7 @@ type VolumeInfo struct {
 	// The capacity of the volume in bytes. This field is OPTIONAL. If not
 	// set, it indicates that the capacity of the volume is unknown (e.g.,
 	// NFS share). If set, it MUST be non-zero.
-	CapacityBytes uint64 `protobuf:"varint,1,opt,name=capacity_bytes,json=capacityBytes" json:"capacity_bytes,omitempty"`
+	CapacityBytes *google_protobuf.UInt64Value `protobuf:"bytes,1,opt,name=capacity_bytes,json=capacityBytes" json:"capacity_bytes,omitempty"`
 	// Contains identity information for the created volume. This field is
 	// REQUIRED. The identity information will be used by the CO in
 	// subsequent calls to refer to the provisioned volume.
@@ -1711,11 +1712,11 @@ func (m *VolumeInfo) String() string            { return proto.CompactTextString
 func (*VolumeInfo) ProtoMessage()               {}
 func (*VolumeInfo) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{9} }
 
-func (m *VolumeInfo) GetCapacityBytes() uint64 {
+func (m *VolumeInfo) GetCapacityBytes() *google_protobuf.UInt64Value {
 	if m != nil {
 		return m.CapacityBytes
 	}
-	return 0
+	return nil
 }
 
 func (m *VolumeInfo) GetHandle() *VolumeHandle {
@@ -1739,7 +1740,7 @@ type VolumeHandle struct {
 	// Plugin. This field is REQUIRED.
 	// This information SHALL NOT be considered sensitive such that, for
 	// example, the CO MAY generate log messages that include this data.
-	Id string `protobuf:"bytes,1,opt,name=id" json:"id,omitempty"`
+	Id *google_protobuf.StringValue `protobuf:"bytes,1,opt,name=id" json:"id,omitempty"`
 	// Metadata captures additional, possibly sensitive, information about
 	// a volume in the form of key-value pairs. This field is OPTIONAL.
 	// Since this field MAY contain sensitive information, the CO MUST NOT
@@ -1752,11 +1753,11 @@ func (m *VolumeHandle) String() string            { return proto.CompactTextStri
 func (*VolumeHandle) ProtoMessage()               {}
 func (*VolumeHandle) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{10} }
 
-func (m *VolumeHandle) GetId() string {
+func (m *VolumeHandle) GetId() *google_protobuf.StringValue {
 	if m != nil {
 		return m.Id
 	}
-	return ""
+	return nil
 }
 
 func (m *VolumeHandle) GetMetadata() map[string]string {
@@ -1982,7 +1983,7 @@ type ControllerPublishVolumeRequest struct {
 	VolumeCapability *VolumeCapability `protobuf:"bytes,4,opt,name=volume_capability,json=volumeCapability" json:"volume_capability,omitempty"`
 	// Whether to publish the volume in readonly mode. This field is
 	// REQUIRED.
-	Readonly bool `protobuf:"varint,5,opt,name=readonly" json:"readonly,omitempty"`
+	Readonly *google_protobuf.BoolValue `protobuf:"bytes,5,opt,name=readonly" json:"readonly,omitempty"`
 	// End user credentials used to authenticate/authorize controller
 	// publish request.
 	// This field is OPTIONAL.
@@ -2022,11 +2023,11 @@ func (m *ControllerPublishVolumeRequest) GetVolumeCapability() *VolumeCapability
 	return nil
 }
 
-func (m *ControllerPublishVolumeRequest) GetReadonly() bool {
+func (m *ControllerPublishVolumeRequest) GetReadonly() *google_protobuf.BoolValue {
 	if m != nil {
 		return m.Readonly
 	}
-	return false
+	return nil
 }
 
 func (m *ControllerPublishVolumeRequest) GetUserCredentials() *Credentials {
@@ -2569,10 +2570,10 @@ func _ValidateVolumeCapabilitiesResponse_OneofSizer(msg proto.Message) (n int) {
 type ValidateVolumeCapabilitiesResponse_Result struct {
 	// True if the Plugin supports the specified capabilities for the
 	// given volume. This field is REQUIRED.
-	Supported bool `protobuf:"varint,1,opt,name=supported" json:"supported,omitempty"`
+	Supported *google_protobuf.BoolValue `protobuf:"bytes,1,opt,name=supported" json:"supported,omitempty"`
 	// Message to the CO if `supported` above is false. This field is
 	// OPTIONAL.
-	Message string `protobuf:"bytes,2,opt,name=message" json:"message,omitempty"`
+	Message *google_protobuf.StringValue `protobuf:"bytes,2,opt,name=message" json:"message,omitempty"`
 }
 
 func (m *ValidateVolumeCapabilitiesResponse_Result) Reset() {
@@ -2584,18 +2585,18 @@ func (*ValidateVolumeCapabilitiesResponse_Result) Descriptor() ([]byte, []int) {
 	return fileDescriptor0, []int{20, 0}
 }
 
-func (m *ValidateVolumeCapabilitiesResponse_Result) GetSupported() bool {
+func (m *ValidateVolumeCapabilitiesResponse_Result) GetSupported() *google_protobuf.BoolValue {
 	if m != nil {
 		return m.Supported
 	}
-	return false
+	return nil
 }
 
-func (m *ValidateVolumeCapabilitiesResponse_Result) GetMessage() string {
+func (m *ValidateVolumeCapabilitiesResponse_Result) GetMessage() *google_protobuf.StringValue {
 	if m != nil {
 		return m.Message
 	}
-	return ""
+	return nil
 }
 
 // //////
@@ -2610,11 +2611,11 @@ type ListVolumesRequest struct {
 	// `ListVolumes` call. This field is OPTIONAL. If not specified, it
 	// means there is no restriction on the number of entries that can be
 	// returned.
-	MaxEntries uint32 `protobuf:"varint,2,opt,name=max_entries,json=maxEntries" json:"max_entries,omitempty"`
+	MaxEntries *google_protobuf.UInt32Value `protobuf:"bytes,2,opt,name=max_entries,json=maxEntries" json:"max_entries,omitempty"`
 	// A token to specify where to start paginating. Set this field to
 	// `next_token` returned by a previous `ListVolumes` call to get the
 	// next page of entries. This field is OPTIONAL.
-	StartingToken string `protobuf:"bytes,3,opt,name=starting_token,json=startingToken" json:"starting_token,omitempty"`
+	StartingToken *google_protobuf.StringValue `protobuf:"bytes,3,opt,name=starting_token,json=startingToken" json:"starting_token,omitempty"`
 }
 
 func (m *ListVolumesRequest) Reset()                    { *m = ListVolumesRequest{} }
@@ -2629,18 +2630,18 @@ func (m *ListVolumesRequest) GetVersion() *Version {
 	return nil
 }
 
-func (m *ListVolumesRequest) GetMaxEntries() uint32 {
+func (m *ListVolumesRequest) GetMaxEntries() *google_protobuf.UInt32Value {
 	if m != nil {
 		return m.MaxEntries
 	}
-	return 0
+	return nil
 }
 
-func (m *ListVolumesRequest) GetStartingToken() string {
+func (m *ListVolumesRequest) GetStartingToken() *google_protobuf.StringValue {
 	if m != nil {
 		return m.StartingToken
 	}
-	return ""
+	return nil
 }
 
 type ListVolumesResponse struct {
@@ -2773,7 +2774,7 @@ type ListVolumesResponse_Result struct {
 	// `max_entries`, use the `next_token` as a value for the
 	// `starting_token` field in the next `ListVolumes` request. This
 	// field is OPTIONAL.
-	NextToken string `protobuf:"bytes,2,opt,name=next_token,json=nextToken" json:"next_token,omitempty"`
+	NextToken *google_protobuf.StringValue `protobuf:"bytes,2,opt,name=next_token,json=nextToken" json:"next_token,omitempty"`
 }
 
 func (m *ListVolumesResponse_Result) Reset()                    { *m = ListVolumesResponse_Result{} }
@@ -2788,11 +2789,11 @@ func (m *ListVolumesResponse_Result) GetEntries() []*ListVolumesResponse_Result_
 	return nil
 }
 
-func (m *ListVolumesResponse_Result) GetNextToken() string {
+func (m *ListVolumesResponse_Result) GetNextToken() *google_protobuf.StringValue {
 	if m != nil {
 		return m.NextToken
 	}
-	return ""
+	return nil
 }
 
 type ListVolumesResponse_Result_Entry struct {
@@ -2986,7 +2987,7 @@ type GetCapacityResponse_Result struct {
 	// specified in the request, the Plugin SHALL take those into
 	// consideration when calculating the available capacity of the
 	// storage. This field is REQUIRED.
-	AvailableCapacity uint64 `protobuf:"varint,1,opt,name=available_capacity,json=availableCapacity" json:"available_capacity,omitempty"`
+	AvailableCapacity *google_protobuf.UInt64Value `protobuf:"bytes,1,opt,name=available_capacity,json=availableCapacity" json:"available_capacity,omitempty"`
 }
 
 func (m *GetCapacityResponse_Result) Reset()                    { *m = GetCapacityResponse_Result{} }
@@ -2994,11 +2995,11 @@ func (m *GetCapacityResponse_Result) String() string            { return proto.C
 func (*GetCapacityResponse_Result) ProtoMessage()               {}
 func (*GetCapacityResponse_Result) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{24, 0} }
 
-func (m *GetCapacityResponse_Result) GetAvailableCapacity() uint64 {
+func (m *GetCapacityResponse_Result) GetAvailableCapacity() *google_protobuf.UInt64Value {
 	if m != nil {
 		return m.AvailableCapacity
 	}
-	return 0
+	return nil
 }
 
 // //////
@@ -3295,13 +3296,13 @@ type NodePublishVolumeRequest struct {
 	// absolute path in the root filesystem of the process serving this
 	// request. The CO SHALL ensure uniqueness of target_path per volume.
 	// This is a REQUIRED field.
-	TargetPath string `protobuf:"bytes,4,opt,name=target_path,json=targetPath" json:"target_path,omitempty"`
+	TargetPath *google_protobuf.StringValue `protobuf:"bytes,4,opt,name=target_path,json=targetPath" json:"target_path,omitempty"`
 	// The capability of the volume the CO expects the volume to have.
 	// This is a REQUIRED field.
 	VolumeCapability *VolumeCapability `protobuf:"bytes,5,opt,name=volume_capability,json=volumeCapability" json:"volume_capability,omitempty"`
 	// Whether to publish the volume in readonly mode. This field is
 	// REQUIRED.
-	Readonly bool `protobuf:"varint,6,opt,name=readonly" json:"readonly,omitempty"`
+	Readonly *google_protobuf.BoolValue `protobuf:"bytes,6,opt,name=readonly" json:"readonly,omitempty"`
 	// End user credentials used to authenticate/authorize node publish
 	// request. This field is OPTIONAL.
 	UserCredentials *Credentials `protobuf:"bytes,7,opt,name=user_credentials,json=userCredentials" json:"user_credentials,omitempty"`
@@ -3333,11 +3334,11 @@ func (m *NodePublishVolumeRequest) GetPublishVolumeInfo() map[string]string {
 	return nil
 }
 
-func (m *NodePublishVolumeRequest) GetTargetPath() string {
+func (m *NodePublishVolumeRequest) GetTargetPath() *google_protobuf.StringValue {
 	if m != nil {
 		return m.TargetPath
 	}
-	return ""
+	return nil
 }
 
 func (m *NodePublishVolumeRequest) GetVolumeCapability() *VolumeCapability {
@@ -3347,11 +3348,11 @@ func (m *NodePublishVolumeRequest) GetVolumeCapability() *VolumeCapability {
 	return nil
 }
 
-func (m *NodePublishVolumeRequest) GetReadonly() bool {
+func (m *NodePublishVolumeRequest) GetReadonly() *google_protobuf.BoolValue {
 	if m != nil {
 		return m.Readonly
 	}
-	return false
+	return nil
 }
 
 func (m *NodePublishVolumeRequest) GetUserCredentials() *Credentials {
@@ -3504,7 +3505,7 @@ type NodeUnpublishVolumeRequest struct {
 	// The path at which the volume was published. It MUST be an absolute
 	// path in the root filesystem of the process serving this request.
 	// This is a REQUIRED field.
-	TargetPath string `protobuf:"bytes,3,opt,name=target_path,json=targetPath" json:"target_path,omitempty"`
+	TargetPath *google_protobuf.StringValue `protobuf:"bytes,3,opt,name=target_path,json=targetPath" json:"target_path,omitempty"`
 	// End user credentials used to authenticate/authorize node unpublish
 	// request. This field is OPTIONAL.
 	UserCredentials *Credentials `protobuf:"bytes,4,opt,name=user_credentials,json=userCredentials" json:"user_credentials,omitempty"`
@@ -3529,11 +3530,11 @@ func (m *NodeUnpublishVolumeRequest) GetVolumeHandle() *VolumeHandle {
 	return nil
 }
 
-func (m *NodeUnpublishVolumeRequest) GetTargetPath() string {
+func (m *NodeUnpublishVolumeRequest) GetTargetPath() *google_protobuf.StringValue {
 	if m != nil {
 		return m.TargetPath
 	}
-	return ""
+	return nil
 }
 
 func (m *NodeUnpublishVolumeRequest) GetUserCredentials() *Credentials {
@@ -4640,10 +4641,10 @@ type Error_GeneralError struct {
 	// will cause it to succeed. If this value is false, the caller MAY
 	// reissue the same call, but SHOULD implement exponential backoff
 	// on retires.
-	CallerMustNotRetry bool `protobuf:"varint,2,opt,name=caller_must_not_retry,json=callerMustNotRetry" json:"caller_must_not_retry,omitempty"`
+	CallerMustNotRetry *google_protobuf.BoolValue `protobuf:"bytes,2,opt,name=caller_must_not_retry,json=callerMustNotRetry" json:"caller_must_not_retry,omitempty"`
 	// Human readable description of error, possibly with additional
 	// information. This string MAY be surfaced by CO to end users.
-	ErrorDescription string `protobuf:"bytes,3,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue `protobuf:"bytes,3,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_GeneralError) Reset()                    { *m = Error_GeneralError{} }
@@ -4658,18 +4659,18 @@ func (m *Error_GeneralError) GetErrorCode() Error_GeneralError_GeneralErrorCode
 	return Error_GeneralError_UNKNOWN
 }
 
-func (m *Error_GeneralError) GetCallerMustNotRetry() bool {
+func (m *Error_GeneralError) GetCallerMustNotRetry() *google_protobuf.BoolValue {
 	if m != nil {
 		return m.CallerMustNotRetry
 	}
-	return false
+	return nil
 }
 
-func (m *Error_GeneralError) GetErrorDescription() string {
+func (m *Error_GeneralError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 // `CreateVolume` specific error.
@@ -4678,7 +4679,7 @@ type Error_CreateVolumeError struct {
 	ErrorCode Error_CreateVolumeError_CreateVolumeErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_CreateVolumeError_CreateVolumeErrorCode" json:"error_code,omitempty"`
 	// Human readable description of error, possibly with additional
 	// information. This string maybe surfaced by CO to end users.
-	ErrorDescription string `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_CreateVolumeError) Reset()                    { *m = Error_CreateVolumeError{} }
@@ -4693,11 +4694,11 @@ func (m *Error_CreateVolumeError) GetErrorCode() Error_CreateVolumeError_CreateV
 	return Error_CreateVolumeError_UNKNOWN
 }
 
-func (m *Error_CreateVolumeError) GetErrorDescription() string {
+func (m *Error_CreateVolumeError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 // `DeleteVolume` specific error.
@@ -4706,7 +4707,7 @@ type Error_DeleteVolumeError struct {
 	ErrorCode Error_DeleteVolumeError_DeleteVolumeErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_DeleteVolumeError_DeleteVolumeErrorCode" json:"error_code,omitempty"`
 	// Human readable description of error, possibly with additional
 	// information. This string maybe surfaced by CO to end users.
-	ErrorDescription string `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_DeleteVolumeError) Reset()                    { *m = Error_DeleteVolumeError{} }
@@ -4721,11 +4722,11 @@ func (m *Error_DeleteVolumeError) GetErrorCode() Error_DeleteVolumeError_DeleteV
 	return Error_DeleteVolumeError_UNKNOWN
 }
 
-func (m *Error_DeleteVolumeError) GetErrorDescription() string {
+func (m *Error_DeleteVolumeError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 // `ControllerPublishVolume` specific error.
@@ -4734,7 +4735,7 @@ type Error_ControllerPublishVolumeError struct {
 	ErrorCode Error_ControllerPublishVolumeError_ControllerPublishVolumeErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_ControllerPublishVolumeError_ControllerPublishVolumeErrorCode" json:"error_code,omitempty"`
 	// Human readable description of error, possibly with additional
 	// information. This string maybe surfaced by CO to end users.
-	ErrorDescription string `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 	// On `VOLUME_ALREADY_ATTACHED` and `MAX_ATTACHED_NODES` errors,
 	// this field contains the node(s) that the specified volume is
 	// already attached to.
@@ -4755,11 +4756,11 @@ func (m *Error_ControllerPublishVolumeError) GetErrorCode() Error_ControllerPubl
 	return Error_ControllerPublishVolumeError_UNKNOWN
 }
 
-func (m *Error_ControllerPublishVolumeError) GetErrorDescription() string {
+func (m *Error_ControllerPublishVolumeError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 func (m *Error_ControllerPublishVolumeError) GetNodeIds() []*NodeID {
@@ -4772,7 +4773,7 @@ func (m *Error_ControllerPublishVolumeError) GetNodeIds() []*NodeID {
 // `ControllerUnpublishVolume` specific error.
 type Error_ControllerUnpublishVolumeError struct {
 	ErrorCode        Error_ControllerUnpublishVolumeError_ControllerUnpublishVolumeErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_ControllerUnpublishVolumeError_ControllerUnpublishVolumeErrorCode" json:"error_code,omitempty"`
-	ErrorDescription string                                                                  `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue                                            `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_ControllerUnpublishVolumeError) Reset()         { *m = Error_ControllerUnpublishVolumeError{} }
@@ -4789,17 +4790,17 @@ func (m *Error_ControllerUnpublishVolumeError) GetErrorCode() Error_ControllerUn
 	return Error_ControllerUnpublishVolumeError_UNKNOWN
 }
 
-func (m *Error_ControllerUnpublishVolumeError) GetErrorDescription() string {
+func (m *Error_ControllerUnpublishVolumeError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 // `ValidateVolumeCapabilities` specific error.
 type Error_ValidateVolumeCapabilitiesError struct {
 	ErrorCode        Error_ValidateVolumeCapabilitiesError_ValidateVolumeCapabilitiesErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_ValidateVolumeCapabilitiesError_ValidateVolumeCapabilitiesErrorCode" json:"error_code,omitempty"`
-	ErrorDescription string                                                                    `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue                                              `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_ValidateVolumeCapabilitiesError) Reset()         { *m = Error_ValidateVolumeCapabilitiesError{} }
@@ -4816,17 +4817,17 @@ func (m *Error_ValidateVolumeCapabilitiesError) GetErrorCode() Error_ValidateVol
 	return Error_ValidateVolumeCapabilitiesError_UNKNOWN
 }
 
-func (m *Error_ValidateVolumeCapabilitiesError) GetErrorDescription() string {
+func (m *Error_ValidateVolumeCapabilitiesError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 // `NodePublishVolume` specific error.
 type Error_NodePublishVolumeError struct {
 	ErrorCode        Error_NodePublishVolumeError_NodePublishVolumeErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_NodePublishVolumeError_NodePublishVolumeErrorCode" json:"error_code,omitempty"`
-	ErrorDescription string                                                  `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue                            `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_NodePublishVolumeError) Reset()         { *m = Error_NodePublishVolumeError{} }
@@ -4843,17 +4844,17 @@ func (m *Error_NodePublishVolumeError) GetErrorCode() Error_NodePublishVolumeErr
 	return Error_NodePublishVolumeError_UNKNOWN
 }
 
-func (m *Error_NodePublishVolumeError) GetErrorDescription() string {
+func (m *Error_NodePublishVolumeError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 // `NodeUnpublishVolume` specific error.
 type Error_NodeUnpublishVolumeError struct {
 	ErrorCode        Error_NodeUnpublishVolumeError_NodeUnpublishVolumeErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_NodeUnpublishVolumeError_NodeUnpublishVolumeErrorCode" json:"error_code,omitempty"`
-	ErrorDescription string                                                      `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue                                `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_NodeUnpublishVolumeError) Reset()         { *m = Error_NodeUnpublishVolumeError{} }
@@ -4870,17 +4871,17 @@ func (m *Error_NodeUnpublishVolumeError) GetErrorCode() Error_NodeUnpublishVolum
 	return Error_NodeUnpublishVolumeError_UNKNOWN
 }
 
-func (m *Error_NodeUnpublishVolumeError) GetErrorDescription() string {
+func (m *Error_NodeUnpublishVolumeError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 // `ProbeNode` specific error.
 type Error_ProbeNodeError struct {
 	ErrorCode        Error_ProbeNodeError_ProbeNodeErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_ProbeNodeError_ProbeNodeErrorCode" json:"error_code,omitempty"`
-	ErrorDescription string                                  `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue            `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_ProbeNodeError) Reset()                    { *m = Error_ProbeNodeError{} }
@@ -4895,17 +4896,17 @@ func (m *Error_ProbeNodeError) GetErrorCode() Error_ProbeNodeError_ProbeNodeErro
 	return Error_ProbeNodeError_UNKNOWN
 }
 
-func (m *Error_ProbeNodeError) GetErrorDescription() string {
+func (m *Error_ProbeNodeError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 // `GetNodeID` specific error.
 type Error_GetNodeIDError struct {
 	ErrorCode        Error_GetNodeIDError_GetNodeIDErrorCode `protobuf:"varint,1,opt,name=error_code,json=errorCode,enum=csi.Error_GetNodeIDError_GetNodeIDErrorCode" json:"error_code,omitempty"`
-	ErrorDescription string                                  `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
+	ErrorDescription *google_protobuf.StringValue            `protobuf:"bytes,2,opt,name=error_description,json=errorDescription" json:"error_description,omitempty"`
 }
 
 func (m *Error_GetNodeIDError) Reset()                    { *m = Error_GetNodeIDError{} }
@@ -4920,11 +4921,11 @@ func (m *Error_GetNodeIDError) GetErrorCode() Error_GetNodeIDError_GetNodeIDErro
 	return Error_GetNodeIDError_UNKNOWN
 }
 
-func (m *Error_GetNodeIDError) GetErrorDescription() string {
+func (m *Error_GetNodeIDError) GetErrorDescription() *google_protobuf.StringValue {
 	if m != nil {
 		return m.ErrorDescription
 	}
-	return ""
+	return nil
 }
 
 func init() {
@@ -5613,207 +5614,214 @@ var _Node_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("csi.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 3231 bytes of a gzipped FileDescriptorProto
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+	0x83, 0xd0, 0x0a, 0x64, 0x7c, 0x8b, 0x88, 0x9e, 0xd4, 0x08, 0x05, 0x36, 0x6e, 0xae, 0x4d, 0xf2,
+	0x10, 0xc4, 0x47, 0x96, 0x40, 0xe7, 0x01, 0xed, 0xe4, 0xde, 0x96, 0x73, 0xb5, 0x5a, 0x2e, 0xbf,
+	0x2d, 0x14, 0xc8, 0x73, 0x91, 0x2a, 0x9b, 0x34, 0x57, 0x96, 0x7b, 0xe1, 0xed, 0x94, 0xeb, 0x62,
+	0x4d, 0xde, 0x2c, 0xe5, 0xb6, 0xaa, 0xec, 0x9c, 0x1f, 0x48, 0xe5, 0xd6, 0x1e, 0x57, 0x04, 0x16,
+	0x4c, 0x51, 0x6e, 0xe0, 0x66, 0xd5, 0x02, 0xa4, 0xd0, 0x22, 0x9c, 0xb5, 0xe7, 0x45, 0x74, 0x29,
+	0x16, 0xd8, 0x59, 0xee, 0x1f, 0x51, 0xf7, 0xad, 0x77, 0xe0, 0xf6, 0xfa, 0x34, 0x20, 0xb2, 0x4a,
+	0x53, 0x17, 0x40, 0x13, 0xc0, 0xa7, 0xb8, 0x96, 0xbf, 0x17, 0x01, 0x7e, 0xb2, 0xf0, 0xe7, 0x1d,
+	0x37, 0x21, 0x91, 0x11, 0x0f, 0x72, 0x57, 0x02, 0xdd, 0x82, 0xeb, 0x76, 0x6e, 0x2f, 0xd7, 0x86,
+	0x51, 0x53, 0x2b, 0xcb, 0xd5, 0x8a, 0x90, 0x2f, 0x6e, 0x16, 0x69, 0x08, 0xb1, 0x49, 0x74, 0x0e,
+	0x58, 0x4a, 0xe7, 0xec, 0xa0, 0xec, 0x2c, 0xf7, 0x2c, 0x0a, 0xab, 0x13, 0x0a, 0x47, 0xd4, 0x0d,
+	0x70, 0xb8, 0x38, 0x7d, 0xe1, 0x39, 0x09, 0x7e, 0x8a, 0x2e, 0xff, 0x35, 0x03, 0x57, 0xa7, 0x90,
+	0xee, 0xf5, 0x79, 0xa8, 0x73, 0x98, 0x71, 0xab, 0x30, 0x32, 0x6e, 0x15, 0x46, 0xc3, 0x56, 0x61,
+	0x2c, 0x60, 0x97, 0x2e, 0x8a, 0x9b, 0x65, 0x36, 0xce, 0x7d, 0x18, 0x85, 0xf3, 0xc1, 0x05, 0x36,
+	0xfa, 0x52, 0x80, 0x43, 0x5e, 0x9b, 0x58, 0x97, 0x87, 0x0c, 0x9f, 0xa2, 0xf9, 0x3f, 0xa5, 0xe7,
+	0x74, 0xd3, 0x64, 0xe8, 0x49, 0xeb, 0x89, 0x09, 0xf7, 0x4b, 0x64, 0x9c, 0x5f, 0xa2, 0xe3, 0xfc,
+	0x12, 0x0b, 0xf3, 0x4b, 0x1c, 0x9d, 0x85, 0x94, 0xc5, 0x46, 0x90, 0xa4, 0xb2, 0xc4, 0x26, 0xc2,
+	0x97, 0x73, 0x92, 0xfb, 0x24, 0x62, 0x1d, 0xa3, 0x07, 0xa6, 0x4b, 0x39, 0xc0, 0x59, 0x9f, 0x9f,
+	0xa2, 0xc5, 0x09, 0x05, 0x9c, 0x6e, 0xb9, 0xb3, 0x32, 0x4e, 0xec, 0x09, 0xba, 0x2c, 0x0d, 0x0b,
+	0x75, 0xd1, 0x6d, 0xe1, 0x68, 0xb8, 0x85, 0x63, 0xdc, 0xb7, 0x22, 0x70, 0xc6, 0xdb, 0xb0, 0xa1,
+	0x87, 0x01, 0x76, 0x7d, 0x31, 0xb4, 0xbf, 0xf3, 0xfd, 0x3d, 0x45, 0x1b, 0xbe, 0x03, 0x68, 0x54,
+	0x96, 0xd7, 0x70, 0x4b, 0x90, 0xde, 0xc8, 0x15, 0xe4, 0x4a, 0xa9, 0xbe, 0x55, 0x14, 0xe5, 0x7c,
+	0x59, 0xdc, 0x2c, 0x6e, 0xb1, 0x0c, 0xba, 0x06, 0x6b, 0x23, 0x3d, 0xce, 0x76, 0xb9, 0x5a, 0x93,
+	0x0b, 0x82, 0x69, 0x5d, 0x41, 0xcc, 0x3f, 0x66, 0x23, 0xc4, 0x14, 0xde, 0x9e, 0x73, 0xa2, 0x29,
+	0xbc, 0xe8, 0xbe, 0xbf, 0xa7, 0x6b, 0x8a, 0x51, 0x59, 0x27, 0x67, 0x8a, 0x8d, 0x24, 0xbd, 0xb7,
+	0x58, 0xff, 0x39, 0x03, 0xb3, 0x45, 0x72, 0x46, 0x6e, 0x1c, 0xa0, 0x2f, 0x93, 0xcf, 0x38, 0x46,
+	0xbe, 0x89, 0x41, 0x6b, 0x63, 0x3e, 0x97, 0x21, 0x47, 0x9f, 0xdc, 0x95, 0x89, 0x1f, 0xd4, 0xf0,
+	0x33, 0x68, 0x1b, 0x16, 0x3c, 0xdf, 0x34, 0xa0, 0xe5, 0xa0, 0xef, 0x1c, 0x2c, 0x86, 0x5c, 0xf8,
+	0x27, 0x10, 0xfc, 0xcc, 0xfa, 0xc7, 0x71, 0x80, 0x61, 0x41, 0x82, 0x04, 0x98, 0x77, 0x77, 0x84,
+	0x28, 0x13, 0xf6, 0x6a, 0x9f, 0x5b, 0x0e, 0x7d, 0xf4, 0xce, 0xcf, 0x98, 0x6c, 0xdc, 0x1d, 0x0b,
+	0x65, 0x13, 0xf0, 0x14, 0x94, 0xb2, 0x09, 0x7a, 0x44, 0xc9, 0xcf, 0xa0, 0x3d, 0xb8, 0x10, 0x52,
+	0x62, 0xa3, 0xab, 0xe3, 0x1f, 0xc0, 0x59, 0xcc, 0xaf, 0x4d, 0xf3, 0x4a, 0x8e, 0x9f, 0x41, 0x1d,
+	0x58, 0x0e, 0x2d, 0xca, 0xd0, 0xf5, 0x49, 0x0f, 0xa6, 0x2c, 0x59, 0x37, 0xa6, 0x7b, 0x57, 0xc5,
+	0xcf, 0x20, 0x15, 0xb8, 0xf0, 0x7a, 0x00, 0xdd, 0x98, 0xf8, 0x60, 0xc8, 0x92, 0xf7, 0xc2, 0x94,
+	0x0f, 0x8b, 0xf8, 0x19, 0xb4, 0x01, 0x29, 0xd7, 0x3b, 0x12, 0x74, 0x61, 0xf4, 0x65, 0x89, 0xc5,
+	0x32, 0x13, 0xf6, 0xe4, 0xc4, 0xe2, 0xe1, 0x7a, 0xa3, 0x40, 0x79, 0x8c, 0xbe, 0xa8, 0xa0, 0x3c,
+	0x02, 0x9e, 0x33, 0xf8, 0xcd, 0xec, 0x3b, 0x80, 0x1f, 0x31, 0x73, 0xf0, 0xcd, 0xc0, 0x88, 0x99,
+	0x43, 0xce, 0xf1, 0xf9, 0x99, 0xf5, 0xef, 0x46, 0x21, 0x66, 0x2e, 0x7b, 0x54, 0x83, 0xf4, 0x48,
+	0x01, 0x80, 0x2e, 0x8d, 0xbd, 0xdb, 0xe5, 0x2e, 0x8f, 0xbf, 0x45, 0xe4, 0x67, 0xd0, 0x17, 0x61,
+	0x31, 0x60, 0x97, 0x42, 0xab, 0xe1, 0x77, 0x5d, 0x16, 0xe7, 0xb5, 0x49, 0x97, 0x61, 0xfc, 0x0c,
+	0x7a, 0x0d, 0xe6, 0x9c, 0x9c, 0x85, 0x96, 0xfc, 0x37, 0x4e, 0x16, 0x9f, 0xf3, 0xc1, 0x17, 0x51,
+	0x16, 0xb5, 0x93, 0xfc, 0x29, 0xb5, 0xff, 0xb2, 0x88, 0x52, 0x8f, 0x5c, 0xef, 0x0c, 0xe7, 0xe5,
+	0x77, 0xcf, 0x6a, 0xf8, 0xcd, 0x89, 0x7f, 0x5e, 0xa1, 0x2e, 0xd9, 0x4d, 0x90, 0x9c, 0xfd, 0xd2,
+	0xbf, 0x03, 0x00, 0x00, 0xff, 0xff, 0xd3, 0xc5, 0x01, 0x12, 0xd0, 0x38, 0x00, 0x00,
 }
diff --git a/spec.md b/spec.md
index 197d7f28..3d68acda 100644
--- a/spec.md
+++ b/spec.md
@@ -226,6 +226,8 @@ Each SP MUST provide:
 ```protobuf
 syntax = "proto3";
 package csi;
+
+import "google/protobuf/wrappers.proto";
 ```
 
 There are three sets of RPCs:
@@ -358,9 +360,9 @@ message GetSupportedVersionsResponse {
 // Specifies a version in Semantic Version 2.0 format.
 // (http://semver.org/spec/v2.0.0.html)
 message Version {
-  uint32 major = 1;  // This field is REQUIRED.
-  uint32 minor = 2;  // This field is REQUIRED.
-  uint32 patch = 3;  // This field is REQUIRED.
+  .google.protobuf.UInt32Value major = 1;  // This field is REQUIRED.
+  .google.protobuf.UInt32Value minor = 2;  // This field is REQUIRED.
+  .google.protobuf.UInt32Value patch = 3;  // This field is REQUIRED.
 }
 ```
 
@@ -375,10 +377,10 @@ message GetPluginInfoRequest {
 message GetPluginInfoResponse {
   message Result {
     // This field is REQUIRED.
-    string name = 1;
+    .google.protobuf.StringValue name = 1;
 
     // This field is REQUIRED. Value of this field is opaque to the CO.
-    string vendor_version = 2;
+    .google.protobuf.StringValue vendor_version = 2;
 
     // This field is OPTIONAL. Values are opaque to the CO.
     map<string, string> manifest = 3;
@@ -420,7 +422,7 @@ message CreateVolumeRequest {
   //    an identifier by which to refer to the newly provisioned
   //    storage. If a storage system supports this, it can optionally
   //    use this name as the identifier for the new volume.
-  string name = 2;
+  .google.protobuf.StringValue name = 2;
 
   // This field is OPTIONAL. This allows the CO to specify the capacity
   // requirement of the volume to be provisioned. If not specified, the
@@ -473,7 +475,7 @@ message VolumeCapability {
   // Indicate that the volume will be accessed via the filesystem API.
   message MountVolume {
     // The filesystem type. This field is OPTIONAL.
-    string fs_type = 1;
+    .google.protobuf.StringValue fs_type = 1;
 
     // The mount options that can be used for the volume. This field is
     // OPTIONAL. `mount_flags` MAY contain sensitive information.
@@ -525,10 +527,10 @@ message VolumeCapability {
 // least one of the these fields MUST be specified.
 message CapacityRange {
   // Volume must be at least this big.
-  uint64 required_bytes = 1;
+  .google.protobuf.UInt64Value required_bytes = 1;
 
   // Volume must not be bigger than this.
-  uint64 limit_bytes = 2;
+  .google.protobuf.UInt64Value limit_bytes = 2;
 }
 
 // The information about a provisioned volume.
@@ -536,7 +538,7 @@ message VolumeInfo {
   // The capacity of the volume in bytes. This field is OPTIONAL. If not
   // set, it indicates that the capacity of the volume is unknown (e.g.,
   // NFS share). If set, it MUST be non-zero.
-  uint64 capacity_bytes = 1;
+  .google.protobuf.UInt64Value capacity_bytes = 1;
 
   // Contains identity information for the created volume. This field is
   // REQUIRED. The identity information will be used by the CO in
@@ -558,7 +560,7 @@ message VolumeHandle {
   // Plugin. This field is REQUIRED.
   // This information SHALL NOT be considered sensitive such that, for
   // example, the CO MAY generate log messages that include this data.
-  string id = 1;
+  .google.protobuf.StringValue id = 1;
 
   // Metadata captures additional, possibly sensitive, information about
   // a volume in the form of key-value pairs. This field is OPTIONAL.
@@ -651,7 +653,7 @@ message ControllerPublishVolumeRequest {
 
   // Whether to publish the volume in readonly mode. This field is
   // REQUIRED.
-  bool readonly = 5;
+  .google.protobuf.BoolValue readonly = 5;
 
   // End user credentials used to authenticate/authorize controller
   // publish request.
@@ -758,11 +760,11 @@ message ValidateVolumeCapabilitiesResponse {
   message Result {
     // True if the Plugin supports the specified capabilities for the
     // given volume. This field is REQUIRED.
-    bool supported = 1;
+    .google.protobuf.BoolValue supported = 1;
 
     // Message to the CO if `supported` above is false. This field is
     // OPTIONAL.
-    string message = 2;
+    .google.protobuf.StringValue message = 2;
   }
 
   // One of the following fields MUST be specified.
@@ -790,12 +792,12 @@ message ListVolumesRequest {
   // `ListVolumes` call. This field is OPTIONAL. If not specified, it
   // means there is no restriction on the number of entries that can be
   // returned.
-  uint32 max_entries = 2;
+  .google.protobuf.UInt32Value max_entries = 2;
 
   // A token to specify where to start paginating. Set this field to
   // `next_token` returned by a previous `ListVolumes` call to get the
   // next page of entries. This field is OPTIONAL.
-  string starting_token = 3;
+  .google.protobuf.StringValue starting_token = 3;
 }
 
 message ListVolumesResponse {
@@ -811,7 +813,7 @@ message ListVolumesResponse {
     // `max_entries`, use the `next_token` as a value for the
     // `starting_token` field in the next `ListVolumes` request. This
     // field is OPTIONAL.
-    string next_token = 2;
+    .google.protobuf.StringValue next_token = 2;
   }
 
   // One of the following fields MUST be specified.
@@ -853,7 +855,7 @@ message GetCapacityResponse {
     // specified in the request, the Plugin SHALL take those into
     // consideration when calculating the available capacity of the
     // storage. This field is REQUIRED.
-    uint64 available_capacity = 1;
+    .google.protobuf.UInt64Value available_capacity = 1;
   }
 
   // One of the following fields MUST be specified.
@@ -940,7 +942,7 @@ message NodePublishVolumeRequest {
   // absolute path in the root filesystem of the process serving this
   // request. The CO SHALL ensure uniqueness of target_path per volume.
   // This is a REQUIRED field.
-  string target_path = 4;
+  .google.protobuf.StringValue target_path = 4;
 
   // The capability of the volume the CO expects the volume to have.
   // This is a REQUIRED field.
@@ -948,7 +950,7 @@ message NodePublishVolumeRequest {
 
   // Whether to publish the volume in readonly mode. This field is
   // REQUIRED.
-  bool readonly = 6;
+  .google.protobuf.BoolValue readonly = 6;
 
   // End user credentials used to authenticate/authorize node publish
   // request. This field is OPTIONAL.
@@ -991,7 +993,7 @@ message NodeUnpublishVolumeRequest {
   // The path at which the volume was published. It MUST be an absolute
   // path in the root filesystem of the process serving this request.
   // This is a REQUIRED field.
-  string target_path = 3;
+  .google.protobuf.StringValue target_path = 3;
 
   // End user credentials used to authenticate/authorize node unpublish
   // request. This field is OPTIONAL.
@@ -1164,11 +1166,11 @@ message Error {
     // will cause it to succeed. If this value is false, the caller MAY
     // reissue the same call, but SHOULD implement exponential backoff
     // on retires.
-    bool caller_must_not_retry = 2;
+    .google.protobuf.BoolValue caller_must_not_retry = 2;
 
     // Human readable description of error, possibly with additional
     // information. This string MAY be surfaced by CO to end users.
-    string error_description = 3;
+    .google.protobuf.StringValue error_description = 3;
   }
 
   // `CreateVolume` specific error.
@@ -1253,7 +1255,7 @@ message Error {
 
     // Human readable description of error, possibly with additional
     // information. This string maybe surfaced by CO to end users.
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `DeleteVolume` specific error.
@@ -1312,7 +1314,7 @@ message Error {
 
     // Human readable description of error, possibly with additional
     // information. This string maybe surfaced by CO to end users.
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `ControllerPublishVolume` specific error.
@@ -1419,7 +1421,7 @@ message Error {
 
     // Human readable description of error, possibly with additional
     // information. This string maybe surfaced by CO to end users.
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
 
     // On `VOLUME_ALREADY_ATTACHED` and `MAX_ATTACHED_NODES` errors,
     // this field contains the node(s) that the specified volume is
@@ -1506,7 +1508,7 @@ message Error {
     }
 
     ControllerUnpublishVolumeErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `ValidateVolumeCapabilities` specific error.
@@ -1544,7 +1546,7 @@ message Error {
     }
 
     ValidateVolumeCapabilitiesErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `NodePublishVolume` specific error.
@@ -1598,7 +1600,7 @@ message Error {
     }
 
     NodePublishVolumeErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `NodeUnpublishVolume` specific error.
@@ -1649,7 +1651,7 @@ message Error {
     }
 
     NodeUnpublishVolumeErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `ProbeNode` specific error.
@@ -1670,7 +1672,7 @@ message Error {
     }
 
     ProbeNodeErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // `GetNodeID` specific error.
@@ -1690,7 +1692,7 @@ message Error {
     }
 
     GetNodeIDErrorCode error_code = 1;
-    string error_description = 2;
+    .google.protobuf.StringValue error_description = 2;
   }
 
   // One of the following fields MUST be specified.