ceph/src/librbd/cache/ImageCache.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_CACHE_IMAGE_CACHE
   5 #define CEPH_LIBRBD_CACHE_IMAGE_CACHE
   6
   7 #include "include/buffer_fwd.h"
   8 #include "include/int_types.h"
   9 #include <vector>
  10
  11 class Context;
  12
  13 namespace librbd {
  14 namespace cache {
  15
  16 /**
  17  * client-side, image extent cache interface
  18  */
  19 struct ImageCache {
  20   typedef std::vector<std::pair<uint64_t,uint64_t> > Extents;
  21
  22   virtual ~ImageCache() {
  23   }
  24
  25   /// client AIO methods
  26   virtual void aio_read(Extents&& image_extents, ceph::bufferlist* bl,
  27                         int fadvise_flags, Context *on_finish) = 0;
  28   virtual void aio_write(Extents&& image_extents, ceph::bufferlist&& bl,
  29                          int fadvise_flags, Context *on_finish) = 0;
  30   virtual void aio_discard(uint64_t offset, uint64_t length,
  31                            bool skip_partial_discard, Context *on_finish) = 0;
  32   virtual void aio_flush(Context *on_finish) = 0;
  33   virtual void aio_writesame(uint64_t offset, uint64_t length,
  34                              ceph::bufferlist&& bl,
  35                              int fadvise_flags, Context *on_finish) = 0;
  36
  37   /// internal state methods
  38   virtual void init(Context *on_finish) = 0;
  39   virtual void shut_down(Context *on_finish) = 0;
  40
  41   virtual void invalidate(Context *on_finish) = 0;
  42   virtual void flush(Context *on_finish) = 0;
  43
  44 };
  45
  46 } // namespace cache
  47 } // namespace librbd
  48
  49 #endif // CEPH_LIBRBD_CACHE_IMAGE_CACHE