ceph/src/messages/MMDSMap.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15
  16 #ifndef CEPH_MMDSMAP_H
  17 #define CEPH_MMDSMAP_H
  18
  19 #include "msg/Message.h"
  20 #include "mds/MDSMap.h"
  21 #include "include/ceph_features.h"
  22
  23 class MMDSMap : public Message {
  24   static const int HEAD_VERSION = 1;
  25   static const int COMPAT_VERSION = 1;
  26 public:
  27
  28   uuid_d fsid;
  29   epoch_t epoch;
  30   bufferlist encoded;
  31
  32   version_t get_epoch() const { return epoch; }
  33   bufferlist& get_encoded() { return encoded; }
  34
  35   MMDSMap() :
  36     Message(CEPH_MSG_MDS_MAP, HEAD_VERSION, COMPAT_VERSION) {}
  37   MMDSMap(const uuid_d &f, const MDSMap *mm) :
  38     Message(CEPH_MSG_MDS_MAP, HEAD_VERSION, COMPAT_VERSION),
  39     fsid(f) {
  40     epoch = mm->get_epoch();
  41     mm->encode(encoded, -1);  // we will reencode with fewer features as necessary
  42   }
  43 private:
  44   ~MMDSMap() override {}
  45
  46 public:
  47   const char *get_type_name() const override { return "mdsmap"; }
  48   void print(ostream& out) const override {
  49     out << "mdsmap(e " << epoch << ")";
  50   }
  51
  52   // marshalling
  53   void decode_payload() override {
  54     bufferlist::iterator p = payload.begin();
  55     ::decode(fsid, p);
  56     ::decode(epoch, p);
  57     ::decode(encoded, p);
  58   }
  59   void encode_payload(uint64_t features) override {
  60     ::encode(fsid, payload);
  61     ::encode(epoch, payload);
  62     if ((features & CEPH_FEATURE_PGID64) == 0 ||
  63         (features & CEPH_FEATURE_MDSENC) == 0 ||
  64         (features & CEPH_FEATURE_MSG_ADDR2) == 0) {
  65       // reencode for old clients.
  66       MDSMap m;
  67       m.decode(encoded);
  68       encoded.clear();
  69       m.encode(encoded, features);
  70     }
  71     ::encode(encoded, payload);
  72   }
  73 };
  74
  75 #endif