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fs_def.h
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fs_def.h
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#ifndef __FS__DEF__H__
#define __FS__DEF__H__
#include "device_io.h"
#include <time.h>
#include <stdint.h>
#include <stdbool.h>
/* 这里面定义的函数接口，所有的文件系统应该要遵循此接口 */
typedef int64_t fs_off_t;
#define FS_MAX_FILE_PATH 2048
#define FS_ERROR -1
#define FS_MAX_PATH
enum {
FS_SEEK_SET,
FS_SEEK_CUR,
FS_SEEK_END
};
#define FS_S_IFREG (2 >> 0)
#define FS_S_IFDIR (2 >> 1)
#define FS_S_IFLNK (2 >> 2)
struct fs_stat {
int st_nlink; //连到该文件的硬连接数目，刚建立的文件值为1
int st_mode;
fs_off_t st_size; //文件字节数(文件大小)
unsigned long st_blksize; //块大小(文件系统的I/O 缓冲区大小)
unsigned long st_blocks; //块数
time_t st_atime; //最后一次访问时间
time_t st_mtime; //最后一次修改时间
time_t st_ctime; //最后一次改变时间(指属性)
};
/** 实现的某种特定的文件系统必须要先实现以下的接口 */
typedef void fs_filesystem_t;
typedef fs_filesystem_t* (fs_filesystem_new_f)(device_handle_t device);
typedef void fs_file_t;
typedef void fs_dir_t;
typedef fs_file_t* (fs_open_f)(device_handle_t device, fs_filesystem_t* fs, const char* path);
typedef void (fs_close_f)(fs_file_t* file);
typedef int (fs_read_f)(fs_file_t* file, char* buf, int count);
typedef int (fs_write_f)(fs_file_t* file, const char* buf, int count);
typedef bool (fs_ftruncate_f)(fs_file_t* file, fs_off_t size);
typedef fs_off_t (fs_lseek_f)(fs_file_t* file, fs_off_t off, int where);
typedef bool (fs_mkdir_f)(device_handle_t device, fs_filesystem_t* fs, const char* path);
typedef bool (fs_rmdir_f)(device_handle_t device, fs_filesystem_t* fs, const char* path);
typedef bool (fs_link_f)(device_handle_t device, fs_filesystem_t* fs, const char* src_path, const char* new_path);
typedef bool (fs_unlink_f)(device_handle_t device, fs_filesystem_t* fs, const char* path);
typedef bool (fs_symlink_f)(device_handle_t device, fs_filesystem_t* fs, const char* src_path, const char* new_path);
typedef bool (fs_readlink_f)(device_handle_t device, fs_filesystem_t* fs, const char *path, char *buf, size_t size);
typedef bool (fs_stat_f)(device_handle_t device, fs_filesystem_t* fs, const char *path, struct fs_stat *buf);
typedef fs_dir_t* (fs_opendir_f)(device_handle_t device, fs_filesystem_t* fs, const char *path);
typedef bool (fs_readdir_f)(fs_dir_t* dir, char* name);
typedef bool (fs_closedir_f)(fs_dir_t* dir);
/* 类似虚表的一个东西 */
struct fs_operate_functions_s{
fs_filesystem_new_f* filesystem_new;
fs_open_f* open;
fs_close_f* close;
fs_read_f* read;
fs_write_f* write;
fs_ftruncate_f* ftruncate;
fs_lseek_f* lseek;
fs_mkdir_f* mkdir;
fs_rmdir_f* rmdir;
fs_link_f* link;
fs_unlink_f* unlink;
fs_symlink_f* symlink;
fs_readlink_f* readlink;
fs_stat_f* stat;
fs_opendir_f* opendir;
fs_readdir_f* readdir;
fs_closedir_f* closedir;
};
#define FS_OPERATE_FUNCTIONS_SET(var, type_name) \
do { \
(var).open = (fs_open_f*)type_name##_open; \
(var).close = (fs_close_f*)type_name##_close; \
(var).read = (fs_read_f*)type_name##_read; \
(var).write = (fs_write_f*)type_name##_write; \
(var).ftruncate = (fs_ftruncate_f*)type_name##_ftruncate; \
(var).lseek = (fs_lseek_f*)type_name##_lseek; \
(var).mkdir = (fs_mkdir_f*)type_name##_mkdir; \
(var).rmdir = (fs_rmdir_f*)type_name##_rmdir; \
(var).link = (fs_link_f*)type_name##_link; \
(var).unlink = (fs_unlink_f*)type_name##_unlink; \
(var).symlink = (fs_symlink_f*)type_name##_symlink; \
(var).readlink = (fs_readlink_f*)type_name##_readlink; \
(var).stat = (fs_stat_f*)type_name##_stat; \
(var).opendir = (fs_opendir_f*)type_name##_opendir; \
(var).readdir = (fs_readdir_f*)type_name##_readdir; \
(var).closedir = (fs_closedir_f*)type_name##_closedir; \
(var).filesystem_new = (fs_filesystem_new_f*)type_name##_filesystem_new; \
\
} while(0); \
#endif /* __FS__DEF__H__ */