ceph/src/librbd/journal/OpenRequest.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_JOURNAL_OPEN_REQUEST_H
   5 #define CEPH_LIBRBD_JOURNAL_OPEN_REQUEST_H
   6
   7 #include "common/ceph_mutex.h"
   8 #include "include/int_types.h"
   9 #include "librbd/journal/TypeTraits.h"
  10
  11 struct Context;
  12
  13 namespace librbd {
  14
  15 struct ImageCtx;
  16
  17 namespace journal {
  18
  19 struct ImageClientMeta;
  20 struct TagData;
  21
  22 template <typename ImageCtxT = ImageCtx>
  23 class OpenRequest {
  24 public:
  25   typedef typename TypeTraits<ImageCtxT>::Journaler Journaler;
  26
  27   static OpenRequest* create(ImageCtxT *image_ctx, Journaler *journaler,
  28                              ceph::mutex *lock, journal::ImageClientMeta *client_meta,
  29                              uint64_t *tag_tid, journal::TagData *tag_data,
  30                              Context *on_finish) {
  31     return new OpenRequest(image_ctx, journaler, lock, client_meta, tag_tid,
  32                            tag_data, on_finish);
  33   }
  34
  35   OpenRequest(ImageCtxT *image_ctx, Journaler *journaler, ceph::mutex *lock,
  36               journal::ImageClientMeta *client_meta, uint64_t *tag_tid,
  37               journal::TagData *tag_data, Context *on_finish);
  38
  39   void send();
  40
  41 private:
  42   /**
  43    * @verbatim
  44    *
  45    * <start>
  46    *    |
  47    *    v
  48    *  INIT
  49    *    |
  50    *    v
  51    * GET_TAGS
  52    *    |
  53    *    v
  54    * <finish>
  55    *
  56    * @endverbatim
  57    */
  58
  59
  60   ImageCtxT *m_image_ctx;
  61   Journaler *m_journaler;
  62   ceph::mutex *m_lock;
  63   journal::ImageClientMeta *m_client_meta;
  64   uint64_t *m_tag_tid;
  65   journal::TagData *m_tag_data;
  66   Context *m_on_finish;
  67
  68   uint64_t m_tag_class = 0;
  69
  70   void send_init();
  71   void handle_init(int r);
  72
  73   void send_get_tags();
  74   void handle_get_tags(int r);
  75
  76   void finish(int r);
  77
  78 };
  79
  80 } // namespace journal
  81 } // namespace librbd
  82
  83 extern template class librbd::journal::OpenRequest<librbd::ImageCtx>;
  84
  85 #endif // CEPH_LIBRBD_JOURNAL_OPEN_REQUEST_H