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/*
* Block device emulated on standard files
*
* Copyright (c) 2017 Christopher Haster
* Distributed under the MIT license
*/
#ifndef LFS_EMUBD_H
#define LFS_EMUBD_H
#include "lfs_config.h"
#include "lfs_bd.h"
// Stats for debugging and optimization
struct lfs_bd_stats {
lfs_lword_t read_count;
lfs_lword_t write_count;
lfs_lword_t erase_count;
};
// The emu bd state
typedef struct lfs_emubd {
char *path;
char *child;
struct lfs_bd_info info;
struct lfs_bd_stats stats;
} lfs_emubd_t;
// Create a block device using path for the directory to store blocks
lfs_error_t lfs_emubd_create(lfs_emubd_t *emu, const char *path);
// Clean up memory associated with emu block device
void lfs_emubd_destroy(lfs_emubd_t *emu);
// Read a block
lfs_error_t lfs_emubd_read(lfs_emubd_t *bd, uint8_t *buffer,
lfs_ino_t ino, lfs_off_t off, lfs_size_t size);
// Program a block
//
// The block must have previously been erased.
lfs_error_t lfs_emubd_write(lfs_emubd_t *bd, const uint8_t *buffer,
lfs_ino_t ino, lfs_off_t off, lfs_size_t size);
// Erase a block
//
// A block must be erased before being programmed. The
// state of an erased block is undefined.
lfs_error_t lfs_emubd_erase(lfs_emubd_t *bd,
lfs_ino_t ino, lfs_off_t off, lfs_size_t size);
// Sync the block device
lfs_error_t lfs_emubd_sync(lfs_emubd_t *bd);
// Get a description of the block device
//
// Any unknown information may be left unmodified
lfs_error_t lfs_emubd_info(lfs_emubd_t *bd, struct lfs_bd_info *info);
// Get stats of operations on the block device
//
// Used for debugging and optimizations
lfs_error_t lfs_emubd_stats(lfs_emubd_t *bd, struct lfs_bd_stats *stats);
// Block device operations
extern const struct lfs_bd_ops lfs_emubd_ops;
#endif
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