1 files changed, 79 insertions, 0 deletions
diff --git a/src/messages/MMDSMap.h b/src/messages/MMDSMap.h
new file mode 100644
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--- /dev/null
+++ b/src/messages/MMDSMap.h
@@ -0,0 +1,79 @@
+// -*- 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 : public MessageInstance<MMDSMap> {
+public:
+  friend factory;
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  uuid_d fsid;
+  epoch_t epoch = 0;
+  bufferlist encoded;
+
+  version_t get_epoch() const { return epoch; }
+  const bufferlist& get_encoded() const { return encoded; }
+
+protected:
+  MMDSMap() : 
+    MessageInstance(CEPH_MSG_MDS_MAP, HEAD_VERSION, COMPAT_VERSION) {}
+  MMDSMap(const uuid_d &f, const MDSMap &mm) :
+    MessageInstance(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() override {}
+
+public:
+  std::string_view get_type_name() const override { return "mdsmap"; }
+  void print(ostream& out) const override {
+    out << "mdsmap(e " << epoch << ")";
+  }
+
+  // marshalling
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(epoch, p);
+    decode(encoded, 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);
+  }
+};
+
+#endif