ceph/src/messages/MLock.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_MLOCK_H
  17 #define CEPH_MLOCK_H
  18
  19 #include "msg/Message.h"
  20 #include "mds/locks.h"
  21 #include "mds/SimpleLock.h"
  22
  23 class MLock : public SafeMessage {
  24 private:
  25   static const int HEAD_VERSION = 1;
  26   static const int COMPAT_VERSION = 1;
  27
  28   int32_t     action = 0;  // action type
  29   mds_rank_t  asker = 0;  // who is initiating this request
  30   metareqid_t reqid;  // for remote lock requests
  31
  32   __u16      lock_type = 0;  // lock object type
  33   MDSCacheObjectInfo object_info;
  34
  35   bufferlist lockdata;  // and possibly some data
  36
  37 public:
  38   bufferlist& get_data() { return lockdata; }
  39   const bufferlist& get_data() const { return lockdata; }
  40   int get_asker() const { return asker; }
  41   int get_action() const { return action; }
  42   metareqid_t get_reqid() const { return reqid; }
  43
  44   int get_lock_type() const { return lock_type; }
  45   const MDSCacheObjectInfo &get_object_info() const { return object_info; }
  46   MDSCacheObjectInfo &get_object_info() { return object_info; }
  47
  48 protected:
  49   MLock() : SafeMessage{MSG_MDS_LOCK, HEAD_VERSION, COMPAT_VERSION} {}
  50   MLock(int ac, mds_rank_t as) :
  51     SafeMessage{MSG_MDS_LOCK, HEAD_VERSION, COMPAT_VERSION},
  52     action(ac), asker(as),
  53     lock_type(0) { }
  54   MLock(SimpleLock *lock, int ac, mds_rank_t as) :
  55     SafeMessage{MSG_MDS_LOCK, HEAD_VERSION, COMPAT_VERSION},
  56     action(ac), asker(as),
  57     lock_type(lock->get_type()) {
  58     lock->get_parent()->set_object_info(object_info);
  59   }
  60   MLock(SimpleLock *lock, int ac, mds_rank_t as, bufferlist& bl) :
  61     SafeMessage{MSG_MDS_LOCK, HEAD_VERSION, COMPAT_VERSION},
  62     action(ac), asker(as), lock_type(lock->get_type()) {
  63     lock->get_parent()->set_object_info(object_info);
  64     lockdata.claim(bl);
  65   }
  66   ~MLock() override {}
  67
  68 public:
  69   std::string_view get_type_name() const override { return "ILock"; }
  70   void print(ostream& out) const override {
  71     out << "lock(a=" << SimpleLock::get_lock_action_name(action)
  72         << " " << SimpleLock::get_lock_type_name(lock_type)
  73         << " " << object_info
  74         << ")";
  75   }
  76
  77   void set_reqid(metareqid_t ri) { reqid = ri; }
  78   void set_data(const bufferlist& lockdata) {
  79     this->lockdata = lockdata;
  80   }
  81
  82   void decode_payload() override {
  83     using ceph::decode;
  84     auto p = payload.cbegin();
  85     decode(asker, p);
  86     decode(action, p);
  87     decode(reqid, p);
  88     decode(lock_type, p);
  89     decode(object_info, p);
  90     decode(lockdata, p);
  91   }
  92   void encode_payload(uint64_t features) override {
  93     using ceph::encode;
  94     encode(asker, payload);
  95     encode(action, payload);
  96     encode(reqid, payload);
  97     encode(lock_type, payload);
  98     encode(object_info, payload);
  99     encode(lockdata, payload);
 100   }
 101 private:
 102   template<class T, typename... Args>
 103   friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
 104 };
 105
 106 #endif