ceph/src/messages/MStatfs.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_MSTATFS_H
  17 #define CEPH_MSTATFS_H
  18
  19 #include <optional>
  20 #include <sys/statvfs.h>    /* or <sys/statfs.h> */
  21 #include "messages/PaxosServiceMessage.h"
  22
  23 class MStatfs final : public PaxosServiceMessage {
  24 private:
  25   static constexpr int HEAD_VERSION = 2;
  26   static constexpr int COMPAT_VERSION = 1;
  27
  28 public:
  29   uuid_d fsid;
  30   std::optional<int64_t> data_pool;
  31
  32   MStatfs() : PaxosServiceMessage{CEPH_MSG_STATFS, 0, HEAD_VERSION, COMPAT_VERSION} {}
  33   MStatfs(const uuid_d& f, ceph_tid_t t, std::optional<int64_t> _data_pool,
  34           version_t v)
  35     : PaxosServiceMessage{CEPH_MSG_STATFS, v, HEAD_VERSION, COMPAT_VERSION},
  36       fsid(f), data_pool(_data_pool) {
  37     set_tid(t);
  38   }
  39
  40 private:
  41   ~MStatfs() final {}
  42
  43 public:
  44   std::string_view get_type_name() const override { return "statfs"; }
  45   void print(std::ostream& out) const override {
  46     out << "statfs(" << get_tid() << " pool "
  47         << (data_pool ? *data_pool : -1) << " v" << version << ")";
  48   }
  49
  50   void encode_payload(uint64_t features) override {
  51     using ceph::encode;
  52     paxos_encode();
  53     encode(fsid, payload);
  54     encode(data_pool, payload);
  55   }
  56   void decode_payload() override {
  57     using ceph::decode;
  58     auto p = payload.cbegin();
  59     paxos_decode(p);
  60     decode(fsid, p);
  61     if (header.version >= 2) {
  62       decode(data_pool, p);
  63     } else {
  64       data_pool = std::optional<int64_t> ();
  65     }
  66   }
  67 private:
  68   template<class T, typename... Args>
  69   friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
  70 };
  71
  72 #endif