继续看rt-thread
/*
+------------------------------------------------------------------------------
| Project : Device Filesystem
+------------------------------------------------------------------------------
| Copyright 2004, 2005 www.fayfayspace.org.
| All rights reserved.
|------------------------------------------------------------------------------
| File : dfs_opts.h, the option definitions of Device FileSystem
|------------------------------------------------------------------------------
| Chang Logs:
| Date Author Notes
| 2005-01-22 ffxz The first version.
+------------------------------------------------------------------------------
*/
#ifndef __DFS_CONFIG_H__
#define __DFS_CONFIG_H__
/*
+------------------------------------------------------------------------------
| Device Manager options
+------------------------------------------------------------------------------
*/
/* Device Options parameters */
#define DEVICES_MAX8
#define DEVICE_NAME_MAX8
/*
+------------------------------------------------------------------------------
| Device Filesystem options
+------------------------------------------------------------------------------
*/
/* the max length of filesystem name */
#define DFS_FS_NAME_MAX4
/* the max type of filesystem */
#define DFS_FILESYSTEM_TYPES_MAX2
/* the max length of path name */
#define DFS_PATH_MAX256
/* the max length of file name */
#define DFS_FILE_MAX256
/* options for server task */
#define DFS_MBOX_NUMBER32
#define DFS_SERVER_STACK1024
#define DFS_SERVER_PRI110
#define DFS_SERVER_SLICE20
/*
+------------------------------------------------------------------------------
| FAT filesystem options
+------------------------------------------------------------------------------
*/
/* file name max length */
#define FAT_NAME_MAX256
/* max number of FAT filesystem */
#define FATFS_MAX2
/* the size of sector */
#define SECTOR_SIZE512
/* FAT table sector cache options */
#define FAT_CACHE_SIZE 0x10 /* config parameter */
#define FAT_CACHE_MASK (FAT_CACHE_SIZE-1)
#define GET16(x) (*(x)) | (*((x)+1) << 8)
#define GET32(x) (*(x)) | (*((x)+1) << 8) | (*((x)+2) << 16) | (*((x)+3) << 24)
#define SET16(x, v) \
do \
{ \
*(x) = (v) & 0x00ff; \
(*((x)+1)) = (v) >> 8; \
} while ( 0 )
#define SET32(x, v) \
do \
{ \
*(x) = (v) & 0x000000ff; \
(*((x)+1)) = ((v) >> 8) & 0x000000ff; \
(*((x)+2)) = ((v) >> 16) & 0x000000ff; \
(*((x)+3)) = ((v) >> 24); \
} while ( 0 )
#define DFS_DEBUG_INFO0x01
#define DFS_DEBUG_WARNING0x02
#define DFS_DEBUG_ERROR0x04
#define DFS_DEBUG_LEVEL(DFS_DEBUG_INFO | DFS_DEBUG_WARNING | DFS_DEBUG_ERROR)
/* #define DFS_DEBUG */
#ifdef DFS_DEBUG
#define dfs_log(level, x)do { if (level & DFS_DEBUG_LEVEL) \
{rt_kprintf("DFS %s, %d:", __FILE__, __LINE__); rt_kprintf x;\
rt_kprintf ("\n");}}while (0)
#else
#define dfs_log(level, x)
#endif
#endif
/*
+------------------------------------------------------------------------------
| Device FileSystem
+------------------------------------------------------------------------------
| Copyright 2004, 2005 www.fayfayspace.org.
| All rights reserved.
|------------------------------------------------------------------------------
| File : dfs_def.h, the definitions of Device FileSystem
|------------------------------------------------------------------------------
| Chang Logs:
| Date Author notes
| 2004-10-01 ffxz The first version.
| 2004-10-14 ffxz Clean up the code.
| 2005-01-22 ffxz Clean up the code, port to MinGW
+------------------------------------------------------------------------------
*/
#ifndef __DFS_DEF_H__
#define __DFS_DEF_H__
#include <rtthread.h> //这个也与线程有关
#include <dfs_config.h>
#if defined(RT_USING_NEWLIB) || defined (RT_USING_MINILIBC)
#include <string.h>
#endif
#ifndef __D_FS__
#define __D_FS__
#endif
/* Device error codes */
#define DFS_STATUS_OK 0 /* no error */
#define DFS_STATUS_ENOENT 2 /* No such file or directory */
#define DFS_STATUS_EIO 5 /* I/O error */
#define DFS_STATUS_ENXIO 6 /* No such device or address */
#define DFS_STATUS_EBADF 9 /* Bad file number */
#define DFS_STATUS_EAGIAN 11 /* Try again */
#define DFS_STATUS_ENOMEM 12 /* no memory */
#define DFS_STATUS_EBUSY 16 /* Device or resource busy */
#define DFS_STATUS_EEXIST 17 /* File exists */
#define DFS_STATUS_EXDEV 18 /* Cross-device link */
#define DFS_STATUS_ENODEV 19 /* No such device */
#define DFS_STATUS_ENOTDIR 20 /* Not a directory */
#define DFS_STATUS_EISDIR 21 /* Is a directory */
#define DFS_STATUS_EINVAL 22 /* Invalid argument */
#define DFS_STATUS_ENOSPC 28 /* No space left on device */
#define DFS_STATUS_EROFS 30 /* Read-only file system */
#define DFS_STATUS_ENOSYS 38 /* Function not implemented */
#define DFS_STATUS_ENOTEMPTY 39 /* Directory not empty */
#define DFS_STATUS_EMMOUNT 128 /* Filesystem table full */
/* Operation flags */
#define DFS_O_RDONLY 0000000
#define DFS_O_WRONLY 0000001
#define DFS_O_RDWR 0000002
#define DFS_O_ACCMODE 0000003
#define DFS_O_CREAT 0000100
#define DFS_O_EXCL 0000200
#define DFS_O_TRUNC 0001000
#define DFS_O_APPEND 0002000
#define DFS_O_DIRECTORY 0200000
/* File flags */
#define DFS_F_OPEN 0x01000000
#define DFS_F_DIRECTORY 0x02000000
#define DFS_F_EOF 0x04000000
#define DFS_F_ERR 0x08000000
/* Seek flags */
#define DFS_SEEK_SET 0
#define DFS_SEEK_CUR 1
#define DFS_SEEK_END 2
/* Stat codes */
#define DFS_S_IFMT 00170000
#define DFS_S_IFSOCK 0140000
#define DFS_S_IFLNK 0120000
#define DFS_S_IFREG 0100000
#define DFS_S_IFBLK 0060000
#define DFS_S_IFDIR 0040000
#define DFS_S_IFCHR 0020000
#define DFS_S_IFIFO 0010000
#define DFS_S_ISUID 0004000
#define DFS_S_ISGID 0002000
#define DFS_S_ISVTX 0001000
#define DFS_S_ISLNK(m) (((m) & DFS_S_IFMT) == DFS_S_IFLNK)
#define DFS_S_ISREG(m) (((m) & DFS_S_IFMT) == DFS_S_IFREG)
#define DFS_S_ISDIR(m) (((m) & DFS_S_IFMT) == DFS_S_IFDIR)
#define DFS_S_ISCHR(m) (((m) & DFS_S_IFMT) == DFS_S_IFCHR)
#define DFS_S_ISBLK(m) (((m) & DFS_S_IFMT) == DFS_S_IFBLK)
#define DFS_S_ISFIFO(m) (((m) & DFS_S_IFMT) == DFS_S_IFIFO)
#define DFS_S_ISSOCK(m) (((m) & DFS_S_IFMT) == DFS_S_IFSOCK)
#define DFS_S_IRWXU 00700
#define DFS_S_IRUSR 00400
#define DFS_S_IWUSR 00200
#define DFS_S_IXUSR 00100
#define DFS_S_IRWXG 00070
#define DFS_S_IRGRP 00040
#define DFS_S_IWGRP 00020
#define DFS_S_IXGRP 00010
#define DFS_S_IRWXO 00007
#define DFS_S_IROTH 00004
#define DFS_S_IWOTH 00002
#define DFS_S_IXOTH 00001
#define DEVICE_GETGEOME 0
#define DEVICE_GETINFO 1
#define DEVICE_FORMAT 2
#define DEVICE_CLEAN_SECTOR 3
struct device_geometry
{
rt_uint32_t sectro_count; /* count of sectors */
rt_uint32_t cylinder_count; /* count of cylinder */
rt_uint32_t sectors_per_track; /* number of sectors per track */
rt_uint32_t head_count; /* count of head */
rt_uint32_t bytes_per_sector; /* number of bytes per sector */
};
struct dfs_stat
{
rt_device_t st_dev;
rt_uint16_t st_mode;
rt_uint32_t st_size;
rt_time_t st_mtime;
rt_uint32_t st_blksize;
};
#define stat dfs_stat
/* File types */
#define FT_REGULAR 0 /* regular file */
#define FT_SOCKET 1 /* socket file */
#define FT_DIRECTORY 2 /* directory */
#define FT_USER 3 /* user defined */
/* file descriptor */
struct dfs_fd
{
char path[DFS_PATH_MAX + 1];/* Name (below mount point) */
int type; /* Type (regular or socket) */
int ref_count; /* Descriptor reference count */
struct dfs_filesystem* fs; /* Resident file system */
rt_uint32_t flags; /* Descriptor flags */
rt_size_t size; /* Size in bytes */
rt_off_t pos; /* Current file position */
void *data; /* Specific file system data */
};
#define DFS_DT_UNKNOWN 0x00
#define DFS_DT_REG 0x01
#define DFS_DT_DIR 0x02
struct dfs_dirent
{
rt_uint8_t d_type; /* The type of the file */
rt_uint8_t d_namlen; /* The length of the not including the terminating null file name */
rt_uint16_t d_reclen; /* length of this record */
char d_name[256]; /* The null-terminated file name */
};
#define dirent dfs_dirent
struct dfs_session
{
rt_mailbox_t mbox;
};
#endif
/*
+------------------------------------------------------------------------------
| Project : Device Filesystem
+------------------------------------------------------------------------------
| Copyright 2004, 2005 www.fayfayspace.org.
| All rights reserved.
|------------------------------------------------------------------------------
| File : dfs_efs.h
|------------------------------------------------------------------------------
| Chang Logs:
| Date Author Notes
| 2010-02-06 Bernard Add elm_init function declaration
+------------------------------------------------------------------------------
*/
#ifndef __DFS_ELM_H__
#define __DFS_ELM_H__
#ifdef __cplusplus
extern "C" {
#endif
int elm_init(void);
#ifdef __cplusplus
}
#endif
#endif
/*
+------------------------------------------------------------------------------
| Project : Device Filesystem
+------------------------------------------------------------------------------
| Copyright 2004, 2005 www.fayfayspace.org.
| All rights reserved.
|------------------------------------------------------------------------------
| File : dfs_fat.h, FAT 12/16/32 file system definitions
|------------------------------------------------------------------------------
| Chang Logs:
| Date Author Notes
| 2003-03-30 ffxz
+------------------------------------------------------------------------------
*/
#ifndef __DFS_FAT_H__
#define __DFS_FAT_H__
#ifdef __cplusplus
extern "C" {
#endif
int fatfs_init(void); //这也单独一个文件，真奢侈
#ifdef __cplusplus
}
#endif
#endif
/*
+------------------------------------------------------------------------------
| Project : Device Filesystem
+------------------------------------------------------------------------------
| Copyright 2004, 2005 www.fayfayspace.org.
| All rights reserved.
|------------------------------------------------------------------------------
| File : dfs_init.h, the initilization definitions of Device FileSystem
|------------------------------------------------------------------------------
| Chang Logs:
| Date Author Notes
| 2005-02-21 ffxz The first version.
+------------------------------------------------------------------------------
*/
#ifndef __DFS_INIT_H__
#define __DFS_INIT_H__
#ifdef __cplusplus
extern "C" {
#endif
/* initilization of dfs */
void dfs_init(void);
/* initilization of dfs with filesystem server */
void dfs_server_init(void);
#ifdef __cplusplus
}
#endif
#endif
/*
+------------------------------------------------------------------------------
| Project : Device Filesystem
+------------------------------------------------------------------------------
| Copyright 2004, 2005 www.fayfayspace.org.
| All rights reserved.
|------------------------------------------------------------------------------
| File : dfs_fs.h, the filesystem related defines of Device FileSystem
|------------------------------------------------------------------------------
| Chang Logs:
| Date Author Notes
| 2005-02-22 ffxz The first version.
+------------------------------------------------------------------------------
*/
#ifndef __DFS_FS_H__
#define __DFS_FS_H__
#include <dfs_def.h>
#include <dfs_config.h>
/* Pre-declaration */
struct dfs_filesystem;
struct dfs_fd;
struct dfs_dirent;
/* File system operations struct */
struct dfs_filesystem_operation //全是函数指针。。。这种用法才是关键技术，回调函数。见过很多次，自己从来没这么写过
{
char name[DFS_FS_NAME_MAX + 1];
int (*mount) (struct dfs_filesystem* fs);
int (*unmount) (struct dfs_filesystem* fs);
int (*open) (struct dfs_fd* fd);
int (*close) (struct dfs_fd* fd);
int (*ioctl) (struct dfs_fd* fd, int cmd, void *args);
int (*read) (struct dfs_fd* fd, void* buf, rt_size_t count);
int (*write) (struct dfs_fd* fd, const void* buf, rt_size_t count);
int (*lseek) (struct dfs_fd* fd, rt_off_t offset);
int (*getdents) (struct dfs_fd* fd, struct dfs_dirent* dirp, rt_uint32_t count);
int (*unlink) (struct dfs_filesystem* fs, const char* pathname);
int (*stat) (struct dfs_filesystem* fs, const char* filename, struct dfs_stat* buf);
int (*rename) (struct dfs_filesystem* fs, const char* oldpath, const char* newpath);
};
/* Mounted file system */
struct dfs_filesystem
{
rt_device_t dev_id; /* Attached device */
char path[DFS_PATH_MAX + 1]; /* File system mount point */
struct dfs_filesystem_operation* ops; /* Operations for file system type */
rt_uint32_t block_id; /* Current block_id on attached device */
void *data; /* Specific file system data */
};
/* file system partition table */
struct dfs_partition
{
rt_uint8_t type; /* file system type */
rt_off_t offset; /* partition start offset */
rt_size_t size; /* partition size */
rt_sem_t lock;
};
//总共就这几个函数，就是文件系统？
int dfs_register(struct dfs_filesystem_operation* ops);
struct dfs_filesystem* dfs_filesystem_lookup(const char *path);
rt_err_t dfs_filesystem_get_partition(struct dfs_partition* part, rt_uint8_t* buf, rt_uint32_t pindex);
int dfs_mount(const char* device_name, const char* path,
const char* filesystemtype, rt_uint32_t rwflag, const
void* data);
int dfs_unmount(const char *specialfile);
/* extern variable */
extern struct dfs_filesystem_operation* filesystem_operation_table[];
extern struct dfs_filesystem filesystem_table[];
extern char working_directory[];
void dfs_lock(void);
void dfs_unlock(void);
#endif
/*
+------------------------------------------------------------------------------
| Project : Device Filesystem
+------------------------------------------------------------------------------
| Copyright 2004, 2005 www.fayfayspace.org.
| All rights reserved.
|------------------------------------------------------------------------------
| File : dfs_posix.h, the filesystem related defines of Device FileSystem
|------------------------------------------------------------------------------
| Chang Logs:
| Date Author Notes
| 2009-05-27 Yi.qiu The first version.
+------------------------------------------------------------------------------
*/
#ifndef __DFS_POSIX_H__
#define __DFS_POSIX_H__
#include <dfs_raw.h>
#define O_RDONLY DFS_O_RDONLY
#define O_WRONLY DFS_O_WRONLY
#define O_RDWR DFS_O_RDWR
#define O_ACCMODE DFS_O_ACCMODE
#define O_CREAT DFS_O_CREAT
#define O_EXCL DFS_O_EXCL
#define O_TRUNC DFS_O_TRUNC
#define O_APPEND DFS_O_APPEND
#define O_DIRECTORY DFS_O_DIRECTORY
#define S_IFMT DFS_S_IFMT
#define S_IFSOCK DFS_S_IFSOCK
#define S_IFLNK DFS_S_IFLNK
#define S_IFREG DFS_S_IFREG
#define S_IFBLK DFS_S_IFBLK
#define S_IFDIR DFS_S_IFDIR
#define S_IFCHR DFS_S_IFCHR
#define S_IFIFO DFS_S_IFIFO
#define S_ISUID DFS_S_ISUID
#define S_ISGID DFS_S_ISGID
#define S_ISVTX DFS_S_ISVTX
#define S_ISLNK(m) (((m) & DFS_S_IFMT) == DFS_S_IFLNK)
#define S_ISREG(m) (((m) & DFS_S_IFMT) == DFS_S_IFREG)
#define S_ISDIR(m) (((m) & DFS_S_IFMT) == DFS_S_IFDIR)
#define S_ISCHR(m) (((m) & DFS_S_IFMT) == DFS_S_IFCHR)
#define S_ISBLK(m) (((m) & DFS_S_IFMT) == DFS_S_IFBLK)
#define S_ISFIFO(m) (((m) & DFS_S_IFMT) == DFS_S_IFIFO)
#define S_ISSOCK(m) (((m) & DFS_S_IFMT) == DFS_S_IFSOCK)
#define S_IRWXU DFS_S_IRWXU
#define S_IRUSR DFS_S_IRUSR
#define S_IWUSR DFS_S_IWUSR
#define S_IXUSR DFS_S_IXUSR
#define S_IRWXG DFS_S_IRWXG
#define S_IRGRP DFS_S_IRGRP
#define S_IWGRP DFS_S_IWGRP
#define S_IXGRP DFS_S_IXGRP
#define S_IRWXO DFS_S_IRWXO
#define S_IROTH DFS_S_IROTH
#define S_IWOTH DFS_S_IWOTH
#define S_IXOTH DFS_S_IXOTH
#define SEEK_SET DFS_SEEK_SET
#define SEEK_CUR DFS_SEEK_CUR
#define SEEK_END DFS_SEEK_END
typedef struct
{
int fd; /* directory file */
char buf[512];
int num;
int cur;
} DIR;
//哇。。标准函数啊
/* file api*/
int open(const char *file, int flags, int mode);
int close(int d);
int read(int fd, char *buf, int len);
int write(int fd, char *buf, int len);
int lseek(int fd, int offset, int dir);
int rename(const char* old, const char* new );
int unlink(const char *pathname);
int stat(const char *file, struct dfs_stat *buf);
/* directory api*/
int mkdir (const char *path, rt_uint16_t mode);
int rmdir(const char *path);
DIR* opendir(const char* name);
struct dfs_dirent* readdir(DIR *d);
rt_off_t telldir(DIR *d);
void seekdir(DIR *d, rt_off_t offset);
void rewinddir(DIR *d);
int closedir(DIR* d);
int chdir(const char *path);
char* getcwd(char *buf, rt_size_t size);
#endif
/* +------------------------------------------------------------------------------ | Project : Device Filesystem +------------------------------------------------------------------------------ | Copyright 2004, 2005 www.fayfayspace.org. | All rights reserved. |------------------------------------------------------------------------------ | File : dfs_raw.h, the raw APIs of Device FileSystem |------------------------------------------------------------------------------ | Chang Logs: | Date Author Notes | 2005-01-26 ffxz The first version +------------------------------------------------------------------------------ */ #ifndef __DFS_RAW_H__ #define __DFS_RAW_H__ #include <dfs_def.h> #include <dfs_fs.h> //底层的读写？--》内核的读写？ int dfile_raw_open(struct dfs_fd* fd, const char *path, int flags); int dfile_raw_close(struct dfs_fd* fd); int dfile_raw_ioctl(struct dfs_fd* fd, int cmd, void *args); int dfile_raw_read(struct dfs_fd* fd, void *buf, rt_size_t len); int dfile_raw_getdents(struct dfs_fd* fd, struct dfs_dirent* dirp, rt_size_t nbytes); int dfile_raw_unlink(const char *path); int dfile_raw_write(struct dfs_fd* fd, const void *buf, rt_size_t len); int dfile_raw_lseek(struct dfs_fd* fd, rt_off_t offset); int dfile_raw_stat(const char *path, struct dfs_stat *buf); int dfile_raw_rename(const char* oldpath, const char* newpath); /* FD APIs */ int fd_new(void); struct dfs_fd* fd_get(int fd); void fd_put(struct dfs_fd* fd); #endif
/* +------------------------------------------------------------------------------ | Project : Device Filesystem +------------------------------------------------------------------------------ | Copyright 2004, 2005 www.fayfayspace.org. | All rights reserved. |------------------------------------------------------------------------------ | File : dfs_util.h, some misc definitions of Device FileSystem |------------------------------------------------------------------------------ | Chang Logs: | Date Author Notes | 2005-01-26 ffxz The first version +------------------------------------------------------------------------------ */ #ifndef __DFS_UTIL_H__ #define __DFS_UTIL_H__ #include <dfs_def.h> int dir_name(const char* path, char* dirname, int len); int file_name(const char* path, char* filename, int len); int next_dir_name(const char* path, int pos, char* next); void build_fullpath(const char *directory, const char *filename, char *fullpath); int str_is_prefix(const char* prefix, const char* str); #if !defined(RT_USING_MINILIBC) && !defined(RT_USING_NEWLIB) char *strrchr(const char *t, int c); #if defined (__ARMCC_VERSION) && (__ARMCC_VERSION / 10000 < 35) #include <stddef.h> int strncasecmp(const char* s1, const char* s2, size_t len); #endif /* end of __ARMCC_VERSION */ #endif #endif
头文件看完。c文件才是技术关键