@@ -438,6 +438,8 @@ type Volume struct {

 	Status     map[string]interface{} `json:",omitempty"` // Status provides low-level status information about the volume

 	Labels     map[string]string      // Labels is metadata specific to the volume

 	Scope      string                 // Scope describes the level at which the volume exists (e.g. `global` for cluster-wide or `local` for machine level)

+	Size       int64                  // Size holds how much disk space is used by the (local driver only). Sets to -1 if not provided.

+	RefCount   int                    // RefCount holds the number of containers having this volume attached to them. Sets to -1 if not provided.

 }

 // VolumesListResponse contains the response for the remote API:

@@ -27,8 +27,10 @@ type mounts []container.Mount

 // volumeToAPIType converts a volume.Volume to the type used by the remote API

 func volumeToAPIType(v volume.Volume) *types.Volume {

 	tv := &types.Volume{

-		Name:   v.Name(),

-		Driver: v.DriverName(),

+		Name:     v.Name(),

+		Driver:   v.DriverName(),

+		Size:     -1,

+		RefCount: -1,

 	}

 	if v, ok := v.(volume.LabeledVolume); ok {

 		tv.Labels = v.Labels()