ceph/src/messages/MClientRequestForward.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_MCLIENTREQUESTFORWARD_H
  17 #define CEPH_MCLIENTREQUESTFORWARD_H
  18
  19 #include "msg/Message.h"
  20
  21 class MClientRequestForward final : public SafeMessage {
  22 private:
  23   int32_t dest_mds;
  24   int32_t num_fwd;
  25   bool client_must_resend;
  26
  27 protected:
  28   MClientRequestForward()
  29     : SafeMessage{CEPH_MSG_CLIENT_REQUEST_FORWARD},
  30       dest_mds(-1), num_fwd(-1), client_must_resend(false) {}
  31   MClientRequestForward(ceph_tid_t t, int dm, int nf, bool cmr) :
  32     SafeMessage{CEPH_MSG_CLIENT_REQUEST_FORWARD},
  33     dest_mds(dm), num_fwd(nf), client_must_resend(cmr) {
  34     ceph_assert(client_must_resend);
  35     header.tid = t;
  36   }
  37   ~MClientRequestForward() final {}
  38
  39 public:
  40   int get_dest_mds() const { return dest_mds; }
  41   int get_num_fwd() const { return num_fwd; }
  42   bool must_resend() const { return client_must_resend; }
  43
  44   std::string_view get_type_name() const override { return "client_request_forward"; }
  45   void print(std::ostream& o) const override {
  46     o << "client_request_forward(" << get_tid()
  47       << " to mds." << dest_mds
  48       << " num_fwd=" << num_fwd
  49       << (client_must_resend ? " client_must_resend":"")
  50       << ")";
  51   }
  52
  53   void encode_payload(uint64_t features) override {
  54     using ceph::encode;
  55     encode(dest_mds, payload);
  56     encode(num_fwd, payload);
  57     encode(client_must_resend, payload);
  58   }
  59
  60   void decode_payload() override {
  61     using ceph::decode;
  62     auto p = payload.cbegin();
  63     decode(dest_mds, p);
  64     decode(num_fwd, p);
  65     decode(client_must_resend, p);
  66   }
  67 private:
  68   template<class T, typename... Args>
  69   friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
  70   template<class T, typename... Args>
  71   friend MURef<T> crimson::make_message(Args&&... args);
  72 };
  73
  74 #endif