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diff --git a/src/messages/MOSDPGQuery.h b/src/messages/MOSDPGQuery.h
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+++ b/src/messages/MOSDPGQuery.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_MOSDPGQUERY_H
+#define CEPH_MOSDPGQUERY_H
+
+#include "common/hobject.h"
+#include "msg/Message.h"
+
+/*
+ * PGQuery - query another OSD as to the contents of their PGs
+ */
+
+class MOSDPGQuery : public MessageInstance<MOSDPGQuery> {
+public:
+  friend factory;
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 4;
+
+  version_t epoch = 0;
+
+ public:
+  version_t get_epoch() const { return epoch; }
+  map<spg_t, pg_query_t>  pg_list;
+
+  MOSDPGQuery() : MessageInstance(MSG_OSD_PG_QUERY,
+			  HEAD_VERSION,
+			  COMPAT_VERSION) {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+  MOSDPGQuery(epoch_t e, map<spg_t,pg_query_t>& ls) :
+    MessageInstance(MSG_OSD_PG_QUERY,
+	    HEAD_VERSION,
+	    COMPAT_VERSION),
+    epoch(e) {
+    pg_list.swap(ls);
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+private:
+  ~MOSDPGQuery() override {}
+
+public:  
+  std::string_view get_type_name() const override { return "pg_query"; }
+  void print(ostream& out) const override {
+    out << "pg_query(";
+    for (map<spg_t,pg_query_t>::const_iterator p = pg_list.begin();
+	 p != pg_list.end(); ++p) {
+      if (p != pg_list.begin())
+	out << ",";
+      out << p->first;
+    }
+    out << " epoch " << epoch << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(pg_list, payload, features);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(pg_list, p);
+  }
+};
+
+#endif