// -*- 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