1 files changed, 92 insertions, 0 deletions
diff --git a/src/messages/MMDSMap.h b/src/messages/MMDSMap.h
new file mode 100644
index 000000000..700cd2121
--- /dev/null
+++ b/src/messages/MMDSMap.h
@@ -0,0 +1,92 @@
+// -*- 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_MMDSMAP_H
+#define CEPH_MMDSMAP_H
+
+#include "msg/Message.h"
+#include "mds/MDSMap.h"
+#include "include/ceph_features.h"
+
+class MMDSMap final : public SafeMessage {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  uuid_d fsid;
+  epoch_t epoch = 0;
+  ceph::buffer::list encoded;
+  // don't really need map_fs_name. it was accidentally added in 51af2346fdf
+  // set it to empty string.
+  std::string map_fs_name = std::string();
+
+  version_t get_epoch() const { return epoch; }
+  const ceph::buffer::list& get_encoded() const { return encoded; }
+
+protected:
+  MMDSMap() : 
+    SafeMessage{CEPH_MSG_MDS_MAP, HEAD_VERSION, COMPAT_VERSION} {}
+
+  MMDSMap(const uuid_d &f, const MDSMap &mm) :
+    SafeMessage{CEPH_MSG_MDS_MAP, HEAD_VERSION, COMPAT_VERSION},
+    fsid(f) {
+    epoch = mm.get_epoch();
+    mm.encode(encoded, -1);  // we will reencode with fewer features as necessary
+  }
+
+  ~MMDSMap() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mdsmap"; }
+  void print(std::ostream& out) const override {
+    out << "mdsmap(e " << epoch << ")";
+  }
+
+  // marshalling
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(epoch, p);
+    decode(encoded, p);
+    if (header.version >= 2) {
+      decode(map_fs_name, p);
+    }
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(fsid, payload);
+    encode(epoch, payload);
+    if ((features & CEPH_FEATURE_PGID64) == 0 ||
+	(features & CEPH_FEATURE_MDSENC) == 0 ||
+	(features & CEPH_FEATURE_MSG_ADDR2) == 0 ||
+	!HAVE_FEATURE(features, SERVER_NAUTILUS)) {
+      // reencode for old clients.
+      MDSMap m;
+      m.decode(encoded);
+      encoded.clear();
+      m.encode(encoded, features);
+    }
+    encode(encoded, payload);
+    encode(map_fs_name, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif