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diff --git a/src/messages/MOSDBackoff.h b/src/messages/MOSDBackoff.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MOSDBACKOFF_H
+#define CEPH_MOSDBACKOFF_H
+
+#include "MOSDFastDispatchOp.h"
+#include "osd/osd_types.h"
+
+class MOSDBackoff : public MessageInstance<MOSDBackoff, MOSDFastDispatchOp> {
+public:
+  friend factory;
+
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  spg_t pgid;
+  epoch_t map_epoch = 0;
+  uint8_t op = 0;           ///< CEPH_OSD_BACKOFF_OP_*
+  uint64_t id = 0;          ///< unique id within this session
+  hobject_t begin, end;     ///< [) range to block, unless ==, block single obj
+
+  spg_t get_spg() const override {
+    return pgid;
+  }
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+
+  MOSDBackoff()
+    : MessageInstance(CEPH_MSG_OSD_BACKOFF, HEAD_VERSION, COMPAT_VERSION) {}
+  MOSDBackoff(spg_t pgid_, epoch_t ep, uint8_t op_, uint64_t id_,
+	      hobject_t begin_, hobject_t end_)
+    : MessageInstance(CEPH_MSG_OSD_BACKOFF, HEAD_VERSION, COMPAT_VERSION),
+      pgid(pgid_),
+      map_epoch(ep),
+      op(op_),
+      id(id_),
+      begin(begin_),
+      end(end_) { }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(op, payload);
+    encode(id, payload);
+    encode(begin, payload);
+    encode(end, payload);
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(op, p);
+    decode(id, p);
+    decode(begin, p);
+    decode(end, p);
+  }
+
+  std::string_view get_type_name() const override { return "osd_backoff"; }
+
+  void print(ostream& out) const override {
+    out << "osd_backoff(" << pgid << " " << ceph_osd_backoff_op_name(op)
+	<< " id " << id
+	<< " [" << begin << "," << end << ")"
+	<< " e" << map_epoch << ")";
+  }
+};
+
+#endif