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diff --git a/src/messages/MDiscover.h b/src/messages/MDiscover.h
new file mode 100644
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+++ b/src/messages/MDiscover.h
@@ -0,0 +1,100 @@
+// -*- 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_MDISCOVER_H
+#define CEPH_MDISCOVER_H
+
+#include "include/filepath.h"
+#include "messages/MMDSOp.h"
+
+#include <string>
+
+
+class MDiscover final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  inodeno_t       base_ino;          // 1 -> root
+  frag_t          base_dir_frag;
+
+  snapid_t        snapid;
+  filepath        want;   // ... [/]need/this/stuff
+
+  bool want_base_dir = true;
+  bool path_locked = false;
+
+ public:
+  inodeno_t get_base_ino() const { return base_ino; }
+  frag_t    get_base_dir_frag() const { return base_dir_frag; }
+  snapid_t  get_snapid() const { return snapid; }
+
+  const filepath& get_want() const { return want; }
+  const std::string& get_dentry(int n) const { return want[n]; }
+
+  bool wants_base_dir() const { return want_base_dir; }
+  bool is_path_locked() const { return path_locked; }
+  
+  void set_base_dir_frag(frag_t f) { base_dir_frag = f; }
+
+protected:
+  MDiscover() : MMDSOp(MSG_MDS_DISCOVER, HEAD_VERSION, COMPAT_VERSION) { }
+  MDiscover(inodeno_t base_ino_,
+	    frag_t base_frag_,
+	    snapid_t s,
+            filepath& want_path_,
+            bool want_base_dir_ = true,
+	    bool path_locked_ = false) :
+    MMDSOp{MSG_MDS_DISCOVER},
+    base_ino(base_ino_),
+    base_dir_frag(base_frag_),
+    snapid(s),
+    want(want_path_),
+    want_base_dir(want_base_dir_),
+    path_locked(path_locked_) { }
+  ~MDiscover() final {}
+
+public:
+  std::string_view get_type_name() const override { return "Dis"; }
+  void print(std::ostream &out) const override {
+    out << "discover(" << header.tid << " " << base_ino << "." << base_dir_frag
+	<< " " << want << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(base_ino, p);
+    decode(base_dir_frag, p);
+    decode(snapid, p);
+    decode(want, p);
+    decode(want_base_dir, p);
+    decode(path_locked, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(base_ino, payload);
+    encode(base_dir_frag, payload);
+    encode(snapid, payload);
+    encode(want, payload);
+    encode(want_base_dir, payload);
+    encode(path_locked, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif