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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_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
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