ra8_io_blockdev_cache.h

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#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdint.h>
 
#include "ra8_err.h"
#include "ra8_io_blockdev.h"

typedef struct {
  uint32_t lba;      
  uint32_t last_use; 
  bool     valid;    
} ra8_io_blockdev_cache_slot_t;

typedef struct {
  const ra8_io_blockdev_t*      under;   
  uint8_t*                      data;    
  ra8_io_blockdev_cache_slot_t* slots;   
  uint32_t                      n_slots; 
  uint32_t                      clock;   
  uint32_t                      hits;    
  uint32_t                      misses;  
} ra8_io_blockdev_cache_state_t;

[[nodiscard]] ra8_err_t ra8_io_blockdev_cache_init(ra8_io_blockdev_t*             bd,
                                                   ra8_io_blockdev_cache_state_t* state,
                                                   const ra8_io_blockdev_t*       under,
                                                   uint8_t*                       data,
                                                   ra8_io_blockdev_cache_slot_t*  slots,
                                                   uint32_t                       n_slots);

[[nodiscard]] ra8_err_t ra8_io_blockdev_cache_stats(const ra8_io_blockdev_cache_state_t* state,
                                                    uint32_t*                            out_hits,
                                                    uint32_t* out_misses);
 
#ifdef __cplusplus
}
#endif