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