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   virtual void aio_compare_and_write(Extents&& image_extents,
  37                                      ceph::bufferlist&& cmp_bl,
  38                                      ceph::bufferlist&& bl,
  39                                      uint64_t *mismatch_offset,
  40                                      int fadvise_flags,
  41                                      Context *on_finish) = 0;
  42
  43   /// internal state methods
  44   virtual void init(Context *on_finish) = 0;
  45   virtual void shut_down(Context *on_finish) = 0;
  46
  47   virtual void invalidate(Context *on_finish) = 0;
  48   virtual void flush(Context *on_finish) = 0;
  49
  50 };
  51
  52 } // namespace cache
  53 } // namespace librbd
  54
  55 #endif // CEPH_LIBRBD_CACHE_IMAGE_CACHE