src/ceph/src/librbd/exclusive_lock/PostAcquireRequest.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_LIBRBD_EXCLUSIVE_LOCK_POST_ACQUIRE_REQUEST_H
   5 #define CEPH_LIBRBD_EXCLUSIVE_LOCK_POST_ACQUIRE_REQUEST_H
   6
   7 #include "include/int_types.h"
   8 #include "include/buffer.h"
   9 #include "librbd/ImageCtx.h"
  10 #include "msg/msg_types.h"
  11 #include <string>
  12
  13 class Context;
  14
  15 namespace librbd {
  16
  17 namespace exclusive_lock {
  18
  19 template <typename ImageCtxT = ImageCtx>
  20 class PostAcquireRequest {
  21 public:
  22   static PostAcquireRequest* create(ImageCtxT &image_ctx, Context *on_acquire,
  23                                     Context *on_finish);
  24
  25   ~PostAcquireRequest();
  26   void send();
  27
  28 private:
  29
  30   /**
  31    * @verbatim
  32    *
  33    *    <start>
  34    *      |
  35    *      |
  36    *      v
  37    * REFRESH (skip if not
  38    *      |   needed)
  39    *      v
  40    * OPEN_OBJECT_MAP (skip if
  41    *      |           disabled)
  42    *      v
  43    * OPEN_JOURNAL (skip if
  44    *      |   *     disabled)
  45    *      |   *
  46    *      |   * * * * * * * *
  47    *      v                 *
  48    *  ALLOCATE_JOURNAL_TAG  *
  49    *      |            *    *
  50    *      |            *    *
  51    *      |            v    v
  52    *      |         CLOSE_JOURNAL
  53    *      |               |
  54    *      |               v
  55    *      |         CLOSE_OBJECT_MAP
  56    *      |               |
  57    *      v               |
  58    *  <finish> <----------/
  59    *
  60    * @endverbatim
  61    */
  62
  63   PostAcquireRequest(ImageCtxT &image_ctx, Context *on_acquire,
  64                      Context *on_finish);
  65
  66   ImageCtxT &m_image_ctx;
  67   Context *m_on_acquire;
  68   Context *m_on_finish;
  69
  70   decltype(m_image_ctx.object_map) m_object_map;
  71   decltype(m_image_ctx.journal) m_journal;
  72
  73   bool m_prepare_lock_completed = false;
  74   int m_error_result;
  75
  76   void send_refresh();
  77   void handle_refresh(int r);
  78
  79   void send_open_journal();
  80   void handle_open_journal(int r);
  81
  82   void send_allocate_journal_tag();
  83   void handle_allocate_journal_tag(int r);
  84
  85   void send_open_object_map();
  86   void handle_open_object_map(int r);
  87
  88   void send_close_journal();
  89   void handle_close_journal(int r);
  90
  91   void send_close_object_map();
  92   void handle_close_object_map(int r);
  93
  94   void apply();
  95   void revert();
  96
  97   void finish();
  98
  99   void save_result(int result) {
 100     if (m_error_result == 0 && result < 0) {
 101       m_error_result = result;
 102     }
 103   }
 104 };
 105
 106 } // namespace exclusive_lock
 107 } // namespace librbd
 108
 109 extern template class librbd::exclusive_lock::PostAcquireRequest<librbd::ImageCtx>;
 110
 111 #endif // CEPH_LIBRBD_EXCLUSIVE_LOCK_POST_ACQUIRE_REQUEST_H