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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_WRITEBACK
#define CEPH_LIBRBD_CACHE_IMAGE_WRITEBACK
#include "include/buffer_fwd.h"
#include "include/int_types.h"
#include "librbd/io/Types.h"
#include <vector>
class Context;
namespace librbd {
struct ImageCtx;
namespace cache {
class ImageWritebackInterface {
public:
typedef std::vector<std::pair<uint64_t,uint64_t> > Extents;
virtual ~ImageWritebackInterface() {
}
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(io::FlushSource flush_source, 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;
};
/**
* client-side, image extent cache writeback handler
*/
template <typename ImageCtxT = librbd::ImageCtx>
class ImageWriteback : public ImageWritebackInterface {
public:
using ImageWritebackInterface::Extents;
explicit ImageWriteback(ImageCtxT &image_ctx);
void aio_read(Extents &&image_extents, ceph::bufferlist *bl,
int fadvise_flags, Context *on_finish);
void aio_write(Extents &&image_extents, ceph::bufferlist&& bl,
int fadvise_flags, Context *on_finish);
void aio_discard(uint64_t offset, uint64_t length,
uint32_t discard_granularity_bytes, Context *on_finish);
void aio_flush(io::FlushSource flush_source, Context *on_finish);
void aio_writesame(uint64_t offset, uint64_t length,
ceph::bufferlist&& bl,
int fadvise_flags, Context *on_finish);
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);
private:
ImageCtxT &m_image_ctx;
};
} // namespace cache
} // namespace librbd
extern template class librbd::cache::ImageWriteback<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_CACHE_IMAGE_WRITEBACK
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