mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-09 19:36:47 +00:00
163 lines
4.8 KiB
C
163 lines
4.8 KiB
C
/**
|
||
* @file VFS.h
|
||
* @author fslongjin (longjin@RinGoTek.cn)
|
||
* @brief 虚拟文件系统
|
||
* @version 0.1
|
||
* @date 2022-04-20
|
||
*
|
||
* @copyright Copyright (c) 2022
|
||
*
|
||
*/
|
||
|
||
#pragma once
|
||
|
||
#include <common/glib.h>
|
||
|
||
struct vfs_superblock_t *vfs_root_sb = NULL;
|
||
|
||
#define VFS_DPT_MBR 0 // MBR分区表
|
||
#define VFS_DPT_GPT 1 // GPT分区表
|
||
|
||
#define VFS_SUCCESS 0
|
||
#define VFS_E_FS_EXISTED 1 // 错误:文件系统已存在
|
||
#define VFS_E_FS_NOT_EXIST 2 // 错误:文件系统不存在
|
||
|
||
/**
|
||
* @brief 目录项的属性
|
||
*
|
||
*/
|
||
#define VFS_ATTR_FILE (1UL << 0)
|
||
#define VFS_ATTR_DIR (1UL << 1)
|
||
|
||
struct vfs_super_block_operations_t;
|
||
struct vfs_inode_operations_t;
|
||
|
||
struct vfs_index_node_t;
|
||
struct vfs_dir_entry_operations_t;
|
||
|
||
struct vfs_dir_entry_t
|
||
{
|
||
char *name;
|
||
int name_length;
|
||
struct List child_node_list;
|
||
struct List subdirs_list;
|
||
|
||
struct vfs_index_node_t *dir_inode;
|
||
struct vfs_dir_entry_t *parent;
|
||
struct vfs_dir_entry_operations_t *dir_ops;
|
||
};
|
||
|
||
struct vfs_superblock_t
|
||
{
|
||
struct vfs_dir_entry_t *root;
|
||
struct vfs_super_block_operations_t *sb_ops;
|
||
void *private_sb_info;
|
||
};
|
||
|
||
/**
|
||
* @brief inode结构体
|
||
*
|
||
*/
|
||
struct vfs_index_node_t
|
||
{
|
||
uint64_t file_size; // 文件大小
|
||
uint64_t blocks; // 占用的扇区数
|
||
uint64_t attribute;
|
||
|
||
struct vfs_superblock_t *sb;
|
||
struct vfs_file_operations_t *file_ops;
|
||
struct vfs_inode_operations_t *inode_ops;
|
||
|
||
void *private_inode_info;
|
||
};
|
||
|
||
/**
|
||
* @brief 文件描述符
|
||
*
|
||
*/
|
||
struct vfs_file_t
|
||
{
|
||
long position;
|
||
uint64_t mode;
|
||
|
||
struct vfs_dir_entry_t *dEntry;
|
||
struct vfs_file_operations_t *file_ops;
|
||
void *private_data;
|
||
};
|
||
|
||
struct vfs_filesystem_type_t
|
||
{
|
||
char *name;
|
||
int fs_flags;
|
||
struct vfs_superblock_t *(*read_superblock)(void *DPTE, uint8_t DPT_type, void *buf, int8_t ahci_ctrl_num, int8_t ahci_port_num, int8_t part_num); // 解析文件系统引导扇区的函数,为文件系统创建超级块结构。其中DPTE为磁盘分区表entry(MBR、GPT不同)
|
||
struct vfs_filesystem_type_t *next;
|
||
};
|
||
|
||
struct vfs_super_block_operations_t
|
||
{
|
||
void (*write_superblock)(struct vfs_superblock_t *sb); // 将超级块信息写入磁盘
|
||
void (*put_superblock)(struct vfs_superblock_t *sb);
|
||
void (*write_inode)(struct vfs_index_node_t *inode); // 将inode信息写入磁盘
|
||
};
|
||
|
||
/**
|
||
* @brief 对vfs的inode的操作抽象
|
||
*
|
||
*/
|
||
struct vfs_inode_operations_t
|
||
{
|
||
long (*create)(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dEntry, int mode);
|
||
struct vfs_dir_entry_t *(*lookup)(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_t *dest_dEntry);
|
||
long (*mkdir)(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dEntry, int mode);
|
||
long (*rmdir)(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dEntry);
|
||
long (*rename)(struct vfs_index_node_t *old_inode, struct vfs_dir_entry_t *old_dEntry, struct vfs_index_node_t *new_inode, struct vfs_dir_entry_t *new_dEntry);
|
||
long (*getAttr)(struct vfs_dir_entry_t *dEntry, uint64_t *attr);
|
||
long (*setAttr)(struct vfs_dir_entry_t *dEntry, uint64_t *attr);
|
||
};
|
||
|
||
struct vfs_dir_entry_operations_t
|
||
{
|
||
long (*compare)(struct vfs_dir_entry_t *parent_dEntry, char *source_filename, char *dest_filename);
|
||
long (*hash)(struct vfs_dir_entry_t *dEntry, char *filename);
|
||
long (*release)(struct vfs_dir_entry_t *dEntry);
|
||
long (*iput)(struct vfs_dir_entry_t *dEntry, struct vfs_index_node_t *inode);
|
||
};
|
||
|
||
struct vfs_file_operations_t
|
||
{
|
||
long (*open)(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr);
|
||
long (*close)(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr);
|
||
long (*read)(struct vfs_file_t *file_ptr, char *buf, int64_t count, long *position);
|
||
long (*write)(struct vfs_file_t *file_ptr, char *buf, int64_t count, long *position);
|
||
long (*lseek)(struct vfs_file_t *file_ptr, long offset, long origin);
|
||
long (*ioctl)(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr, uint64_t cmd, uint64_t arg);
|
||
};
|
||
|
||
/**
|
||
* @brief 在VFS中注册文件系统
|
||
*
|
||
* @param fs 文件系统类型结构体
|
||
* @return uint64_t
|
||
*/
|
||
uint64_t vfs_register_filesystem(struct vfs_filesystem_type_t *fs);
|
||
uint64_t vfs_unregister_filesystem(struct vfs_filesystem_type_t *fs);
|
||
|
||
/**
|
||
* @brief 挂载文件系统
|
||
*
|
||
* @param name 文件系统名
|
||
* @param DPTE 分区表entry
|
||
* @param DPT_type 分区表类型
|
||
* @param buf 文件系统的引导扇区
|
||
* @return struct vfs_superblock_t*
|
||
*/
|
||
struct vfs_superblock_t *vfs_mount_fs(char *name, void *DPTE, uint8_t DPT_type, void *buf, int8_t ahci_ctrl_num, int8_t ahci_port_num, int8_t part_num);
|
||
|
||
/**
|
||
* @brief 按照路径查找文件
|
||
*
|
||
* @param path 路径
|
||
* @param flags 1:返回父目录项, 0:返回结果目录项
|
||
* @return struct vfs_dir_entry_t* 目录项
|
||
*/
|
||
struct vfs_dir_entry_t *vfs_path_walk(char *path, uint64_t flags); |