1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LIBRBD_CACHE_PASSTHROUGH_IMAGE_CACHE
#define CEPH_LIBRBD_CACHE_PASSTHROUGH_IMAGE_CACHE
#include "ImageCache.h"
#include "ImageWriteback.h"
namespace librbd {
struct ImageCtx;
namespace cache {
/**
* Example passthrough client-side, image extent cache
*/
template <typename ImageCtxT = librbd::ImageCtx>
class PassthroughImageCache : public ImageCache {
public:
explicit PassthroughImageCache(ImageCtx &image_ctx);
/// client AIO methods
void aio_read(Extents&& image_extents, ceph::bufferlist *bl,
int fadvise_flags, Context *on_finish) override;
void aio_write(Extents&& image_extents, ceph::bufferlist&& bl,
int fadvise_flags, Context *on_finish) override;
void aio_discard(uint64_t offset, uint64_t length,
uint32_t discard_granularity_bytes,
Context *on_finish) override;
void aio_flush(Context *on_finish) override;
void aio_writesame(uint64_t offset, uint64_t length,
ceph::bufferlist&& bl,
int fadvise_flags, Context *on_finish) override;
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) override;
/// internal state methods
void init(Context *on_finish) override;
void shut_down(Context *on_finish) override;
void invalidate(Context *on_finish) override;
void flush(Context *on_finish) override;
private:
ImageCtxT &m_image_ctx;
ImageWriteback<ImageCtxT> m_image_writeback;
};
} // namespace cache
} // namespace librbd
extern template class librbd::cache::PassthroughImageCache<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_CACHE_PASSTHROUGH_IMAGE_CACHE
|
