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diff --git a/src/messages/MOSDRepScrubMap.h b/src/messages/MOSDRepScrubMap.h
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+++ b/src/messages/MOSDRepScrubMap.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 Sage Weil <sage@redhat.com>
+ *
+ * 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_MOSDREPSCRUBMAP_H
+#define CEPH_MOSDREPSCRUBMAP_H
+
+#include "MOSDFastDispatchOp.h"
+
+/*
+ * pass a ScrubMap from a shard back to the primary
+ */
+
+class MOSDRepScrubMap : public MessageInstance<MOSDRepScrubMap, MOSDFastDispatchOp> {
+public:
+  friend factory;
+
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  spg_t pgid;            // primary spg_t
+  epoch_t map_epoch = 0;
+  pg_shard_t from;   // whose scrubmap this is
+  bufferlist scrub_map_bl;
+  bool preempted = false;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDRepScrubMap()
+    : MessageInstance(MSG_OSD_REP_SCRUBMAP, HEAD_VERSION, COMPAT_VERSION) {}
+
+  MOSDRepScrubMap(spg_t pgid, epoch_t map_epoch, pg_shard_t from)
+    : MessageInstance(MSG_OSD_REP_SCRUBMAP, HEAD_VERSION, COMPAT_VERSION),
+      pgid(pgid),
+      map_epoch(map_epoch),
+      from(from) {}
+
+private:
+  ~MOSDRepScrubMap() {}
+
+public:
+  std::string_view get_type_name() const override { return "rep_scrubmap"; }
+  void print(ostream& out) const override {
+    out << "rep_scrubmap(" << pgid << " e" << map_epoch
+	<< " from shard " << from
+	<< (preempted ? " PREEMPTED":"") << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(from, payload);
+    encode(preempted, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(from, p);
+    if (header.version >= 2) {
+      decode(preempted, p);
+    }
+  }
+};
+
+
+#endif