diff --git a/internal/csi-common/controllerserver-default.go b/internal/csi-common/controllerserver-default.go
index a5b21f206..fcc261d78 100644
--- a/internal/csi-common/controllerserver-default.go
+++ b/internal/csi-common/controllerserver-default.go
@@ -28,40 +28,8 @@ import (
 
 // DefaultControllerServer points to default driver.
 type DefaultControllerServer struct {
-	Driver *CSIDriver
 	csi.UnimplementedControllerServer
-}
-
-// ControllerPublishVolume publish volume on node.
-func (cs *DefaultControllerServer) ControllerPublishVolume(
-	ctx context.Context,
-	req *csi.ControllerPublishVolumeRequest,
-) (*csi.ControllerPublishVolumeResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ControllerUnpublishVolume unpublish on node.
-func (cs *DefaultControllerServer) ControllerUnpublishVolume(
-	ctx context.Context,
-	req *csi.ControllerUnpublishVolumeRequest,
-) (*csi.ControllerUnpublishVolumeResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ListVolumes lists volumes.
-func (cs *DefaultControllerServer) ListVolumes(
-	ctx context.Context,
-	req *csi.ListVolumesRequest,
-) (*csi.ListVolumesResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "")
-}
-
-// GetCapacity get volume capacity.
-func (cs *DefaultControllerServer) GetCapacity(
-	ctx context.Context,
-	req *csi.GetCapacityRequest,
-) (*csi.GetCapacityResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "")
+	Driver *CSIDriver
 }
 
 // ControllerGetCapabilities implements the default GRPC callout.
@@ -79,19 +47,3 @@ func (cs *DefaultControllerServer) ControllerGetCapabilities(
 		Capabilities: cs.Driver.capabilities,
 	}, nil
 }
-
-// ListSnapshots lists snapshots.
-func (cs *DefaultControllerServer) ListSnapshots(
-	ctx context.Context,
-	req *csi.ListSnapshotsRequest,
-) (*csi.ListSnapshotsResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "")
-}
-
-// ControllerGetVolume fetch volume information.
-func (cs *DefaultControllerServer) ControllerGetVolume(
-	ctx context.Context,
-	req *csi.ControllerGetVolumeRequest,
-) (*csi.ControllerGetVolumeResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "")
-}
diff --git a/internal/csi-common/identityserver-default.go b/internal/csi-common/identityserver-default.go
index 90f665908..92b92fb2c 100644
--- a/internal/csi-common/identityserver-default.go
+++ b/internal/csi-common/identityserver-default.go
@@ -28,8 +28,8 @@ import (
 
 // DefaultIdentityServer stores driver object.
 type DefaultIdentityServer struct {
-	Driver *CSIDriver
 	csi.UnimplementedControllerServer
+	Driver *CSIDriver
 }
 
 // GetPluginInfo returns plugin information.
diff --git a/internal/csi-common/nodeserver-default.go b/internal/csi-common/nodeserver-default.go
index 40206980d..4e6be24b2 100644
--- a/internal/csi-common/nodeserver-default.go
+++ b/internal/csi-common/nodeserver-default.go
@@ -22,8 +22,6 @@ import (
 	"github.com/ceph/ceph-csi/internal/util/log"
 
 	"github.com/container-storage-interface/spec/lib/go/csi"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 	mount "k8s.io/mount-utils"
 )
 
@@ -35,14 +33,6 @@ type DefaultNodeServer struct {
 	Mounter mount.Interface
 }
 
-// NodeExpandVolume returns unimplemented response.
-func (ns *DefaultNodeServer) NodeExpandVolume(
-	ctx context.Context,
-	req *csi.NodeExpandVolumeRequest,
-) (*csi.NodeExpandVolumeResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "")
-}
-
 // NodeGetInfo returns node ID.
 func (ns *DefaultNodeServer) NodeGetInfo(
 	ctx context.Context,