1 files changed, 29 insertions, 0 deletions
diff --git a/src/librbd/journal/TypeTraits.h b/src/librbd/journal/TypeTraits.h
new file mode 100644
index 000000000..51b025f6d
--- /dev/null
+++ b/src/librbd/journal/TypeTraits.h
@@ -0,0 +1,29 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_JOURNAL_TYPE_TRAITS_H
+#define CEPH_LIBRBD_JOURNAL_TYPE_TRAITS_H
+
+struct ContextWQ;
+
+namespace journal {
+class Future;
+class Journaler;
+class ReplayEntry;
+}
+
+namespace librbd {
+namespace journal {
+
+template <typename ImageCtxT>
+struct TypeTraits {
+  typedef ::journal::Journaler Journaler;
+  typedef ::journal::Future Future;
+  typedef ::journal::ReplayEntry ReplayEntry;
+  typedef ::ContextWQ ContextWQ;
+};
+
+} // namespace journal
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_JOURNAL_TYPE_TRAITS_H