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diff --git a/src/messages/MOSDPGBackfill.h b/src/messages/MOSDPGBackfill.h
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+++ b/src/messages/MOSDPGBackfill.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_MOSDPGBACKFILL_H
+#define CEPH_MOSDPGBACKFILL_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGBackfill : public MessageInstance<MOSDPGBackfill, MOSDFastDispatchOp> {
+public:
+  friend factory;
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 3;
+public:
+  enum {
+    OP_BACKFILL_PROGRESS = 2,
+    OP_BACKFILL_FINISH = 3,
+    OP_BACKFILL_FINISH_ACK = 4,
+  };
+  const char *get_op_name(int o) const {
+    switch (o) {
+    case OP_BACKFILL_PROGRESS: return "progress";
+    case OP_BACKFILL_FINISH: return "finish";
+    case OP_BACKFILL_FINISH_ACK: return "finish_ack";
+    default: return "???";
+    }
+  }
+
+  __u32 op = 0;
+  epoch_t map_epoch = 0, query_epoch = 0;
+  spg_t pgid;
+  hobject_t last_backfill;
+  pg_stat_t stats;
+
+  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(last_backfill, p);
+
+    // For compatibility with version 1
+    decode(stats.stats, p);
+
+    decode(stats, p);
+
+    // Handle hobject_t format change
+    if (!last_backfill.is_max() &&
+	last_backfill.pool == -1)
+      last_backfill.pool = pgid.pool();
+    decode(pgid.shard, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(map_epoch, payload);
+    encode(query_epoch, payload);
+    encode(pgid.pgid, payload);
+    encode(last_backfill, payload);
+
+    // For compatibility with version 1
+    encode(stats.stats, payload);
+
+    encode(stats, payload);
+
+    encode(pgid.shard, payload);
+  }
+
+  MOSDPGBackfill()
+    : MessageInstance(MSG_OSD_PG_BACKFILL, HEAD_VERSION, COMPAT_VERSION) {}
+  MOSDPGBackfill(__u32 o, epoch_t e, epoch_t qe, spg_t p)
+    : MessageInstance(MSG_OSD_PG_BACKFILL, HEAD_VERSION, COMPAT_VERSION),
+      op(o),
+      map_epoch(e), query_epoch(e),
+      pgid(p) {}
+private:
+  ~MOSDPGBackfill() override {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_backfill"; }
+  void print(ostream& out) const override {
+    out << "pg_backfill(" << get_op_name(op)
+	<< " " << pgid
+	<< " e " << map_epoch << "/" << query_epoch
+	<< " lb " << last_backfill
+	<< ")";
+  }
+};
+
+#endif