--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_RBD_MIRROR_SERVICE_DAEMON_TYPES_H
+#define CEPH_RBD_MIRROR_SERVICE_DAEMON_TYPES_H
+
+#include "include/int_types.h"
+#include <iosfwd>
+#include <string>
+#include <boost/variant.hpp>
+
+namespace rbd {
+namespace mirror {
+namespace service_daemon {
+
+typedef uint64_t CalloutId;
+const uint64_t CALLOUT_ID_NONE {0};
+
+enum CalloutLevel {
+ CALLOUT_LEVEL_INFO,
+ CALLOUT_LEVEL_WARNING,
+ CALLOUT_LEVEL_ERROR
+};
+
+std::ostream& operator<<(std::ostream& os, const CalloutLevel& callout_level);
+
+typedef boost::variant<bool, uint64_t, std::string> AttributeValue;
+
+} // namespace service_daemon
+} // namespace mirror
+} // namespace rbd
+
+#endif // CEPH_RBD_MIRROR_SERVICE_DAEMON_TYPES_H