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diff --git a/src/messages/MOSDPGScan.h b/src/messages/MOSDPGScan.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_MOSDPGSCAN_H
+#define CEPH_MOSDPGSCAN_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGScan : public MessageInstance<MOSDPGScan, MOSDFastDispatchOp> {
+public:
+  friend factory;
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 2;
+
+public:
+  enum {
+    OP_SCAN_GET_DIGEST = 1,      // just objects and versions
+    OP_SCAN_DIGEST = 2,          // result
+  };
+  const char *get_op_name(int o) const {
+    switch (o) {
+    case OP_SCAN_GET_DIGEST: return "get_digest";
+    case OP_SCAN_DIGEST: return "digest";
+    default: return "???";
+    }
+  }
+
+  __u32 op = 0;
+  epoch_t map_epoch = 0, query_epoch = 0;
+  pg_shard_t from;
+  spg_t pgid;
+  hobject_t begin, end;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return query_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(map_epoch, p);
+    decode(query_epoch, p);
+    decode(pgid.pgid, p);
+    decode(begin, p);
+    decode(end, p);
+
+    // handle hobject_t format upgrade
+    if (!begin.is_max() && begin.pool == -1)
+      begin.pool = pgid.pool();
+    if (!end.is_max() && end.pool == -1)
+      end.pool = pgid.pool();
+
+    decode(from, p);
+    decode(pgid.shard, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(map_epoch, payload);
+    if (!HAVE_FEATURE(features, SERVER_NAUTILUS)) {
+      // pre-nautilus OSDs do not set last_peering_reset properly
+      encode(map_epoch, payload);
+    } else {
+      encode(query_epoch, payload);
+    }
+    encode(pgid.pgid, payload);
+    encode(begin, payload);
+    encode(end, payload);
+    encode(from, payload);
+    encode(pgid.shard, payload);
+  }
+
+  MOSDPGScan()
+    : MessageInstance(MSG_OSD_PG_SCAN, HEAD_VERSION, COMPAT_VERSION) {}
+  MOSDPGScan(__u32 o, pg_shard_t from,
+	     epoch_t e, epoch_t qe, spg_t p, hobject_t be, hobject_t en)
+    : MessageInstance(MSG_OSD_PG_SCAN, HEAD_VERSION, COMPAT_VERSION),
+      op(o),
+      map_epoch(e), query_epoch(qe),
+      from(from),
+      pgid(p),
+      begin(be), end(en) {
+  }
+private:
+  ~MOSDPGScan() override {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_scan"; }
+  void print(ostream& out) const override {
+    out << "pg_scan(" << get_op_name(op)
+	<< " " << pgid
+	<< " " << begin << "-" << end
+	<< " e " << map_epoch << "/" << query_epoch
+	<< ")";
+  }
+};
+
+#endif