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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LIBRBD_CACHE_IMAGE_CACHE
#define CEPH_LIBRBD_CACHE_IMAGE_CACHE
#include "include/buffer_fwd.h"
#include "include/int_types.h"
#include <vector>
class Context;
namespace librbd {
namespace cache {
/**
* client-side, image extent cache interface
*/
struct ImageCache {
typedef std::vector<std::pair<uint64_t,uint64_t> > Extents;
virtual ~ImageCache() {
}
/// client AIO methods
virtual void aio_read(Extents&& image_extents, ceph::bufferlist* bl,
int fadvise_flags, Context *on_finish) = 0;
virtual void aio_write(Extents&& image_extents, ceph::bufferlist&& bl,
int fadvise_flags, Context *on_finish) = 0;
virtual void aio_discard(uint64_t offset, uint64_t length,
uint32_t discard_granularity_bytes,
Context *on_finish) = 0;
virtual void aio_flush(Context *on_finish) = 0;
virtual void aio_writesame(uint64_t offset, uint64_t length,
ceph::bufferlist&& bl,
int fadvise_flags, Context *on_finish) = 0;
virtual void aio_compare_and_write(Extents&& image_extents,
ceph::bufferlist&& cmp_bl,
ceph::bufferlist&& bl,
uint64_t *mismatch_offset,
int fadvise_flags,
Context *on_finish) = 0;
/// internal state methods
virtual void init(Context *on_finish) = 0;
virtual void shut_down(Context *on_finish) = 0;
virtual void invalidate(Context *on_finish) = 0;
virtual void flush(Context *on_finish) = 0;
};
} // namespace cache
} // namespace librbd
#endif // CEPH_LIBRBD_CACHE_IMAGE_CACHE
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