ceph/src/librbd/cache/ImageWriteback.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_WRITEBACK
   5 #define CEPH_LIBRBD_CACHE_IMAGE_WRITEBACK
   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
  15 struct ImageCtx;
  16
  17 namespace cache {
  18
  19 /**
  20  * client-side, image extent cache writeback handler
  21  */
  22 template <typename ImageCtxT = librbd::ImageCtx>
  23 class ImageWriteback {
  24 public:
  25   typedef std::vector<std::pair<uint64_t,uint64_t> > Extents;
  26
  27   ImageWriteback(ImageCtxT &image_ctx);
  28
  29   void aio_read(Extents &&image_extents, ceph::bufferlist *bl,
  30                 int fadvise_flags, Context *on_finish);
  31   void aio_write(Extents &&image_extents, ceph::bufferlist&& bl,
  32                  int fadvise_flags, Context *on_finish);
  33   void aio_discard(uint64_t offset, uint64_t length,
  34                    bool skip_partial_discard, Context *on_finish);
  35   void aio_flush(Context *on_finish);
  36   void aio_writesame(uint64_t offset, uint64_t length,
  37                      ceph::bufferlist&& bl,
  38                      int fadvise_flags, Context *on_finish);
  39   void aio_compare_and_write(Extents &&image_extents,
  40                              ceph::bufferlist&& cmp_bl,
  41                              ceph::bufferlist&& bl,
  42                              uint64_t *mismatch_offset,
  43                              int fadvise_flags, Context *on_finish);
  44 private:
  45   ImageCtxT &m_image_ctx;
  46
  47 };
  48
  49 } // namespace cache
  50 } // namespace librbd
  51
  52 extern template class librbd::cache::ImageWriteback<librbd::ImageCtx>;
  53
  54 #endif // CEPH_LIBRBD_CACHE_IMAGE_WRITEBACK