240 lines
12 KiB
C
240 lines
12 KiB
C
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/**
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* @file fatfs_posix_api.h
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* @brief
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*
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* Copyright (c) 2021 Bouffalolab team
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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*/
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/*************************************************************************************************************
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* 文件名 : ff_vfs.h
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* 功能 : VFS虚拟文件系统支持
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* 作者 : cp1300@139.com
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* 创建时间 : 2020-09-29
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* 最后修改时间 : 2020-09-29
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* 详细 : 兼容linux的vfs文件系统API支持，需要先初始化fatfs
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*************************************************************************************************************/
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#ifndef _FF_VFS_H_
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#define _FF_VFS_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "ff.h"
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#include "drv_mmheap.h"
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typedef int ff_dev_t; //32为int数据，高12位主设备号，低20位次设备号
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typedef int ff_off_t; //文件偏移此处使用32bit格式，由于FATFS最大只支持4G大小文件,此处设置为只支持2GB文件大小
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typedef uint32_t ff_time_t;
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typedef struct {
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uint32_t dd_vfs_fd;
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uint32_t dd_rsv;
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} ff_dir_t;
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struct stat {
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ff_dev_t st_dev;
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uint32_t st_size;
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uint32_t st_mode;
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ff_time_t st_actime;
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ff_time_t st_modtime;
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uint64_t st_ino;
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uint32_t st_nlink;
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uint32_t st_blksize;
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uint32_t st_uid;
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uint32_t st_gid;
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};
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typedef struct {
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uint32_t d_ino; /* file number */
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uint8_t d_type; /* type of file */
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char d_name[]; /* file name */
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} ff_dirent_t;
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typedef const struct fs_ops fs_ops_t;
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struct ff_utimbuf {
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ff_time_t actime; /**< time of last access */
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ff_time_t modtime; /**< time of last modification */
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};
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//用于 utimes 修改文件的访问时间，未实现
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struct ff_timeval {
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ff_time_t tv_sec; /* seconds */
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ff_time_t tv_usec; /* microseconds */
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};
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/* for posix fcntl() and lockf() */
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#define F_RDLCK 0
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#define F_WRLCK 1
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#define F_UNLCK 2
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//打开文件的参数flags定义
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#define O_RDONLY (1 << 0) //以只读方式打开文件
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#define O_WRONLY (1 << 1) //以只写方式打开
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#define O_RDWR (O_RDONLY | O_WRONLY) //以可读可写方式打开
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#define O_ACCMODE (O_RDWR)
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#define O_CREAT (1 << 8) //文件不存在时创建文件
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#define O_EXCL (1 << 9) //在打开文件时，如果文件存在而且同时指定的标志位O_CREAT，则返回-EEXIST；如果文件不存在，则创建文件
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#define O_NOCTTY (1 << 10)
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#define O_TRUNC (1 << 11) //打开文件时，如果文件的长度不为0，则将文件的长度截短为0，下次写入文件时，从文件开始出写入数据
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#define O_APPEND (1 << 12) //打开文件后，将文件的写入点设置为文件末尾，下次写入文件时，新写入的数据会追加到文件末尾
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#define O_DSYNC (1 << 13)
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#define O_NONBLOCK (1 << 14)
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#define O_SYNC (1 << 15)
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//文件偏移参数
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#define VFS_SEEK_SET (0) //文件偏移设置为从文件开始处offset字节处
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#define VFS_SEEK_CUR (1) //文件偏移设置为相对于当前文件位置的offset字节处
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#define VFS_SEEK_END (2) //文件偏移摄者为文件末尾的offset字节处
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//访问权限测试值
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#define R_OK (1 << 2)
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#define W_OK (1 << 1)
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#define X_OK (1 << 0)
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//文件特性，并未实现
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struct flock {
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short l_type;
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short l_whence;
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short l_start;
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short l_len;
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};
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#define F_DUPFD 0 /* dup */
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#define F_GETFD 1 /* get close_on_exec */
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#define F_SETFD 2 /* set/clear close_on_exec */
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#define F_GETFL 3 /* get file->f_flags */
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#define F_SETFL 4 /* set file->f_flags */
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#ifndef F_GETLK
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#define F_GETLK 5
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#define F_SETLK 6
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#define F_SETLKW 7
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#endif //F_GETLK
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//文件权限模式，并未实现
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typedef unsigned int ff_mode_t;
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//用户与组id，并未实现
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typedef unsigned int ff_uid_t;
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typedef unsigned int ff_gid_t;
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#define F_OK 0
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#define EPERM 1 /* Operation not permitted */
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#define ENOENT 2 /* No such file or directory */
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#define ESRCH 3 /* No such process */
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#define EINTR 4 /* Interrupted system call */
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#define EIO 5 /* I/O error */
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#define ENXIO 6 /* No such device or address */
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#define E2BIG 7 /* Argument list too long */
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#define ENOEXEC 8 /* Exec format error */
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#define EBADF 9 /* Bad file number */
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#define ECHILD 10 /* No child processes */
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#define EAGAIN 11 /* Try again */
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#define ENOMEM 12 /* Out of memory */
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#define EACCES 13 /* Permission denied */
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#define EFAULT 14 /* Bad address */
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#define ENOTBLK 15 /* Block device required */
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#define EBUSY 16 /* Device or resource busy */
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#define EEXIST 17 /* File exists */
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#define EXDEV 18 /* Cross-device link */
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#define ENODEV 19 /* No such device */
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#define ENOTDIR 20 /* Not a directory */
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#define EISDIR 21 /* Is a directory */
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#define EINVAL 22 /* Invalid argument */
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#define ENFILE 23 /* File table overflow */
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#define EMFILE 24 /* Too many open files */
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#define ENOTTY 25 /* Not a typewriter */
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#define ETXTBSY 26 /* Text file busy */
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#define EFBIG 27 /* File too large */
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#define ENOSPC 28 /* No space left on device */
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#define ESPIPE 29 /* Illegal seek */
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#define EROFS 30 /* Read-only file system */
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#define EMLINK 31 /* Too many links */
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#define EPIPE 32 /* Broken pipe */
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#define EDOM 33 /* Math argument out of domain of func */
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#define ERANGE 34 /* Math result not representable */
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int ff_vfs_init(void); //初始化VFS系统。系统启动流程中组件初始化函数
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int ff_open(const char *path, int flags, int mode); //打开path所描述的文件或者设备
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int ff_close(int fd); //关闭已打开的文件描述符fd
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int ff_read(int fd, void *buf, size_t nbytes); //从打开的文件中读取若干字节到buffer
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int ff_write(int fd, const void *buf, size_t nbytes); //将buffer开始出的nbytes字节数据写入到已经打开的文件
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ff_off_t ff_lseek(int fd, ff_off_t offset, int whence); //重新设置已打开文件的偏移
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int ff_sync(int fd); //会将对文件系统元数据(metadata)的修改以及文件系统内部缓存中的数据写入底层文件系统中
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int ff_stat(const char *path, struct stat *st); //读取文件的属性信息，如文件大小、文件模式（权限、文件/文件夹）
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int ff_fstat(int fd, struct stat *st); //读取文件的属性信息，如文件大小、文件模式（权限、文件/文件夹）等信息到st指针指向的buffer
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int ff_link(const char *oldpath, const char *newpath); //为文件创建一个新的链接文件。如果目标文件存在，则不会覆盖
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int ff_unlink(const char *path); //从文件系统中删除文件名
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int ff_remove(const char *path); //从文件系统中删除文件名，它既可以删除文件，也可以删除目录。
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int ff_rename(const char *oldpath, const char *newpath); //重命名一个文件，可以将文件从一个文件夹下通过重命名移动到另外一个文件夹下
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ff_dir_t *ff_opendir(const char *path); //打开目录名path对应的目录流，并返回目录流指针
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int ff_closedir(ff_dir_t *dirp); //关闭目录流。调用ff_closedir()后，目录流指针不再可用
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ff_dirent_t *ff_readdir(ff_dir_t *dirp); //返回一个指向ff_dirent_t的指针，该指针关联的目录流dirp的成员指针指向下一个成员
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int ff_mkdir(const char *path); //创建名为path的目录。如果已经存在path目录，则创建失败
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int ff_rmdir(const char *path); //删除一个目录。删除目录时，目录必须为空。
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void ff_rewinddir(ff_dir_t *dirp); //将目录流dirp的位置重置为目录的开始处。
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int ff_telldir(ff_dir_t *dirp); //返回与目录流dirp相关联的目录流的当前位置。
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void ff_seekdir(ff_dir_t *dir, long loc); //设置目录流的位置，下次调用ff_readdir()时目录流将从设置的位置开始读取目录
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int ff_access(const char *path, int amode); //检查当前程序是否可以访问path文件
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int ff_chdir(const char *path); //改变当前程序的工作目录到path路径。
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char *ff_getcwd(char *buf, size_t size); //返回当当前程序的绝对工作目录字符串指针，同时如果buf参数不为空，也将当前工作目录字符串复制到buf中
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long ff_pathconf(const char *path, int name); //函数返回配置文件的限制值，是与文件或目录相关联的运行时限制。
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long ff_fpathconf(int fd, int name); //返回配置文件的限制值
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int ff_utime(const char *path, const struct ff_utimbuf *times); //通过参数times的actime和modtime成员改变文件的访问时间和修改时间
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int ff_ftruncate(int fd, ff_off_t length); //指定文件大小
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int ff_fcntl(int fd, int cmd, struct flock *lock); //根据文件描述词来操作文件的特性
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int ff_fchmod(int fd, ff_mode_t mode); //改变现有文件的访问权限
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int ff_fchown(int fd, ff_uid_t owner, ff_gid_t group); //更改文件的用户ID和组ID
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ff_uid_t ff_geteuid(void); //获取用户有效 UID 值
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int ff_utimes(const char *path, const struct ff_timeval times[2]); //修改一个文件的访问时间和修改时间
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#define S_ISREG(st_mode) 0 //是否是一个常规文件-未实现
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#define S_ISDIR(st_mode) 0 //是否是一个目录-未实现
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//标准VFS文件接口
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#define open ff_open //打开文件
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#define close ff_close //关闭已打开的文件
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#define read ff_read //读取已打开的文件
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#define write ff_write //写入已打开的文件
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#define lseek ff_lseek //重新设置已打开文件的偏移
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//#define sync ff_sync //同步文件，刷新缓存
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#define fsync ff_sync //同步文件，刷新缓存
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__inline int stat(const char *path, struct stat *st)
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{
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return ff_stat(path, st);
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} //获取文件信息,有重名的结构体，这个地方只能使用内联函数
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#define fstat ff_fstat //获取文件信息
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#define access ff_access //测试访问权限
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#define getcwd ff_getcwd //返回当当前程序的绝对工作目录
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#define ftruncate ff_ftruncate //指定文件大小
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#define fcntl ff_fcntl //根据文件描述词来操作文件的特性
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#define fchmod ff_fchmod //改变现有文件的访问权限
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#define unlink ff_unlink //从文件系统中删除文件
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#define mkdir ff_mkdir //创建名为path的目录
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#define rmdir ff_rmdir //删除一个目录
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//#define fchown ff_fchown //更改文件的用户ID和组ID
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//#define geteuid ff_geteuid //获取用户有效 UID 值
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#define utimes ff_utimes //修改一个文件的访问时间和修改时间
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#ifdef __cplusplus
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}
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#endif
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#endif //_FF_VFS_H_
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