--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_IMAGE_TYPE_TRAITS_H
+#define CEPH_LIBRBD_IMAGE_TYPE_TRAITS_H
+
+class ContextWQ;
+
+namespace librbd {
+namespace image {
+
+template <typename ImageCtxT>
+struct TypeTraits {
+ typedef ::ContextWQ ContextWQ;
+};
+
+} // namespace image
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_IMAGE_TYPE_TRAITS_H