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diff --git a/src/messages/MOSDRepScrub.h b/src/messages/MOSDRepScrub.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) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * 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_MOSDREPSCRUB_H
+#define CEPH_MOSDREPSCRUB_H
+
+#include "MOSDFastDispatchOp.h"
+
+/*
+ * instruct an OSD initiate a replica scrub on a specific PG
+ */
+
+class MOSDRepScrub : public MessageInstance<MOSDRepScrub, MOSDFastDispatchOp> {
+public:
+  friend factory;
+
+  static constexpr int HEAD_VERSION = 9;
+  static constexpr int COMPAT_VERSION = 6;
+
+  spg_t pgid;             // PG to scrub
+  eversion_t scrub_from; // only scrub log entries after scrub_from
+  eversion_t scrub_to;   // last_update_applied when message sent
+  epoch_t map_epoch = 0, min_epoch = 0;
+  bool chunky;           // true for chunky scrubs
+  hobject_t start;       // lower bound of scrub, inclusive
+  hobject_t end;         // upper bound of scrub, exclusive
+  bool deep;             // true if scrub should be deep
+  bool allow_preemption = false;
+  int32_t priority = 0;
+  bool high_priority = false;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDRepScrub()
+    : MessageInstance(MSG_OSD_REP_SCRUB, HEAD_VERSION, COMPAT_VERSION),
+      chunky(false),
+      deep(false) { }
+
+  MOSDRepScrub(spg_t pgid, eversion_t scrub_to, epoch_t map_epoch, epoch_t min_epoch,
+               hobject_t start, hobject_t end, bool deep,
+	       bool preemption, int prio, bool highprio)
+    : MessageInstance(MSG_OSD_REP_SCRUB, HEAD_VERSION, COMPAT_VERSION),
+      pgid(pgid),
+      scrub_to(scrub_to),
+      map_epoch(map_epoch),
+      min_epoch(min_epoch),
+      chunky(true),
+      start(start),
+      end(end),
+      deep(deep),
+      allow_preemption(preemption),
+      priority(prio),
+      high_priority(highprio) { }
+
+
+private:
+  ~MOSDRepScrub() override {}
+
+public:
+  std::string_view get_type_name() const override { return "replica scrub"; }
+  void print(ostream& out) const override {
+    out << "replica_scrub(pg: "	<< pgid
+	<< ",from:" << scrub_from
+	<< ",to:" << scrub_to
+        << ",epoch:" << map_epoch << "/" << min_epoch
+	<< ",start:" << start << ",end:" << end
+        << ",chunky:" << chunky
+        << ",deep:" << deep
+        << ",version:" << header.version
+	<< ",allow_preemption:" << (int)allow_preemption
+	<< ",priority=" << priority
+	<< (high_priority ? " (high)":"")
+	<< ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid.pgid, payload);
+    encode(scrub_from, payload);
+    encode(scrub_to, payload);
+    encode(map_epoch, payload);
+    encode(chunky, payload);
+    encode(start, payload);
+    encode(end, payload);
+    encode(deep, payload);
+    encode(pgid.shard, payload);
+    encode((uint32_t)-1, payload); // seed
+    encode(min_epoch, payload);
+    encode(allow_preemption, payload);
+    encode(priority, payload);
+    encode(high_priority, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(pgid.pgid, p);
+    decode(scrub_from, p);
+    decode(scrub_to, p);
+    decode(map_epoch, p);
+    decode(chunky, p);
+    decode(start, p);
+    decode(end, p);
+    decode(deep, p);
+    decode(pgid.shard, p);
+    {
+      uint32_t seed;
+      decode(seed, p);
+    }
+    if (header.version >= 7) {
+      decode(min_epoch, p);
+    } else {
+      min_epoch = map_epoch;
+    }
+    if (header.version >= 8) {
+      decode(allow_preemption, p);
+    }
+    if (header.version >= 9) {
+      decode(priority, p);
+      decode(high_priority, p);
+    }
+  }
+};
+
+#endif