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https://github.com/eledio-devices/thirdparty-littlefs.git
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106b06a457
The core algorithim that backs this filesystem's goal of fault tolerance is the alternating of "metadata pairs". Backed by a simple core function for reading and writing, makes heavy use of c99 designated initializers for passing info about multiple chunks in an erase block.
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
/*
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* Configuration and type definitions
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*
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* Copyright (c) 2017 Christopher Haster
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* Distributed under the MIT license
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*/
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#ifndef LFS_CONFIG_H
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#define LFS_CONFIG_H
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#include <stdint.h>
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// Type definitions
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typedef uint64_t lfs_lword_t;
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typedef uint32_t lfs_word_t;
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typedef uint16_t lfs_hword_t;
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typedef lfs_word_t lfs_size_t;
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typedef lfs_word_t lfs_off_t;
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typedef int lfs_error_t;
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typedef lfs_lword_t lfs_lsize_t;
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typedef lfs_word_t lfs_ino_t;
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typedef lfs_hword_t lfs_ioff_t;
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// Maximum length of file name
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#define LFS_NAME_MAX 255
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// Builtin functions
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static inline lfs_word_t lfs_max(lfs_word_t a, lfs_word_t b) {
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return (a > b) ? a : b;
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}
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static inline lfs_word_t lfs_min(lfs_word_t a, lfs_word_t b) {
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return (a < b) ? a : b;
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}
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static inline lfs_word_t lfs_ctz(lfs_word_t a) {
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return __builtin_ctz(a);
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}
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static inline lfs_word_t lfs_npw2(lfs_word_t a) {
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return 32 - __builtin_clz(a-1);
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}
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static inline void lfs_swap(lfs_word_t *a, lfs_word_t *b) {
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lfs_word_t temp = *a;
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*a = *b;
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*b = temp;
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}
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// Attributes
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#define lfs_disk_struct struct __attribute__((packed))
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// Logging operations
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#include <stdio.h>
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#define LFS_ERROR(fmt, ...) printf("Error: " fmt "\n", __VA_ARGS__)
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#define LFS_WARN(fmt, ...) printf("Warn: " fmt "\n", __VA_ARGS__)
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#define LFS_INFO(fmt, ...) printf("Info: " fmt "\n", __VA_ARGS__)
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#endif
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