mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 00:32:38 +01:00
53674cb3bc
This comes with a lot of scafolding put into place around the core of the filesystem. Added operations: - append an entry to a directory - find an entry in a directory - iterate over entries in a directory Some to do: - Chaining multiple directory blocks - Recursion on directory operations
99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
/*
|
|
* The little filesystem
|
|
*
|
|
* Copyright (c) 2017 Christopher Haster
|
|
* Distributed under the MIT license
|
|
*/
|
|
#ifndef LFS_H
|
|
#define LFS_H
|
|
|
|
#include "lfs_config.h"
|
|
#include "lfs_bd.h"
|
|
|
|
|
|
// Data structures
|
|
enum lfs_error {
|
|
LFS_ERROR_OK = 0,
|
|
LFS_ERROR_CORRUPT = -3,
|
|
LFS_ERROR_NO_ENTRY = -4,
|
|
LFS_ERROR_EXISTS = -5,
|
|
LFS_ERROR_NOT_DIR = -6,
|
|
LFS_ERROR_INVALID = -7,
|
|
};
|
|
|
|
enum lfs_type {
|
|
LFS_TYPE_REG = 1,
|
|
LFS_TYPE_DIR = 2,
|
|
};
|
|
|
|
typedef struct lfs_free {
|
|
lfs_disk_struct lfs_disk_free {
|
|
lfs_ino_t head;
|
|
lfs_word_t ioff;
|
|
lfs_word_t icount;
|
|
lfs_word_t rev;
|
|
} d;
|
|
} lfs_free_t;
|
|
|
|
typedef struct lfs_dir {
|
|
lfs_ino_t pair[2];
|
|
lfs_off_t i;
|
|
|
|
lfs_disk_struct lfs_disk_dir {
|
|
lfs_word_t rev;
|
|
lfs_size_t size;
|
|
lfs_ino_t tail[2];
|
|
|
|
struct lfs_disk_free free;
|
|
} d;
|
|
} lfs_dir_t;
|
|
|
|
typedef struct lfs_entry {
|
|
lfs_ino_t dir[2];
|
|
lfs_off_t off;
|
|
|
|
lfs_disk_struct lfs_disk_entry {
|
|
uint16_t type;
|
|
uint16_t len;
|
|
union {
|
|
lfs_disk_struct {
|
|
lfs_ino_t head;
|
|
lfs_size_t size;
|
|
} file;
|
|
lfs_ino_t dir[2];
|
|
} u;
|
|
} d;
|
|
} lfs_entry_t;
|
|
|
|
typedef struct lfs_superblock {
|
|
lfs_ino_t pair[2];
|
|
lfs_disk_struct lfs_disk_superblock {
|
|
lfs_word_t rev;
|
|
uint32_t size;
|
|
lfs_ino_t root[2];
|
|
char magic[8];
|
|
uint32_t block_size;
|
|
uint32_t block_count;
|
|
} d;
|
|
} lfs_superblock_t;
|
|
|
|
// Little filesystem type
|
|
typedef struct lfs {
|
|
lfs_bd_t *bd;
|
|
const struct lfs_bd_ops *ops;
|
|
|
|
lfs_ino_t cwd[2];
|
|
lfs_free_t free;
|
|
struct lfs_bd_info info;
|
|
} lfs_t;
|
|
|
|
// Functions
|
|
lfs_error_t lfs_create(lfs_t *lfs, lfs_bd_t *bd, const struct lfs_bd_ops *bd_ops);
|
|
lfs_error_t lfs_format(lfs_t *lfs);
|
|
lfs_error_t lfs_mount(lfs_t *lfs);
|
|
|
|
lfs_error_t lfs_mkdir(lfs_t *lfs, const char *path);
|
|
|
|
|
|
#endif
|