Added volume.Creater interface and simple HostPath implementation

pkg/volume/volume.go

@@ -18,6 +18,7 @@ package volume
 
 import (
 	"io/ioutil"
+	"k8s.io/kubernetes/pkg/api"
 	"os"
 	"path"
 )
@@ -65,6 +66,12 @@ type Recycler interface {
 	Recycle() error
 }
 
+// Create adds a new resource in the storage provider and creates a PersistentVolume for the new resource.
+// Calls to Create should block until complete.
+type Creater interface {
+	Create() (*api.PersistentVolume, error)
+}
+
 // Delete removes the resource from the underlying storage provider.  Calls to this method should block until
 // the deletion is complete. Any error returned indicates the volume has failed to be reclaimed.
 // A nil return indicates success.