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filesys.h
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#ifndef _FILESYS_H
#define _FILESYS_H
#define delete dele //delete 在c++里是保留字 by tangfl
//#define exit(a) return //建议使用 return by tangfl
//All Defines
#define BLOCKSIZ 512 //每个块的大小
#define SYSOPENFILE 40
#define DIRNUM 128 //一个目录下 最多 子目录数
#define DIRSIZ 12 //目录名长度 windows32下int长度为4 xiao 14->12
#define PWDSIZ 12 //密码最大长度
#define PWDNUM 32
#define NOFILE 20 //用户最多打开文件数
#define NADDR 10 //i节点内存储
#define NHINO 128 //hash数 ?????????/* must be power of 2 */
#define USERNUM 10
#define DINODESIZ 52 //?????? int=4 故多了2*NADRR 但源代码中为long，该做short 应该为50字节，此处可能系统为了对齐内存，故如此调整xiao 32->52
/*filesys*/
#define DINODEBLK 32 //i节点占用的块数
#define FILEBLK 512 //数据块数
#define NICFREE 50 //超级块内空闲块堆栈大小
#define NICINOD 50 //超级块内空闲i节点数组大小
#define DINODESTART (2*BLOCKSIZ) //i节点开始地址 空出1024，第一个为引导区，第二块为超级块
#define DATASTART ((2+DINODEBLK)*BLOCKSIZ) //数据区开始地址 DINODESTART+DINODEBLK*BLOCKSIZ /*d:17408 0x4400*/
/*di_mode*/
#define DIEMPTY 00000 //空权限
#define DIFILE 01000 //类型 文件
#define DIDIR 02000 //类型 目录
#define UDIREAD 00001 //用户权限
#define UDIWRITE 00002
#define UDIEXECUTE 00004
#define GDIREAD 00010 //用户组权限
#define GDIWRITE 00020
#define GDIEXECUTE 00040
#define ODIREAD 00100 //pubilc权限
#define ODIWRITE 00200
#define ODIEXECUTE 00400
#define READ 1
#define WRITE 2
#define EXECUTE 3
#define DEFAULTMODE 00777 //默认权限
/* i_flag */
#define IUPDATE 00002
/* s_fmod */
#define SUPDATE 00001
/* f_flag */
#define FREAD 00001
#define FWRITE 00002
#define FAPPEND 00004
//Includes
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <stdlib.h>
/* error */
#define DISKFULL 65535
/* fseek origin */
//#define SEEK_SET 0
struct inode{
struct inode *i_forw;
struct inode *i_back;
char i_flag;
unsigned int i_ino; /*磁盘i 节点标志*/
unsigned int i_count; /*引用计数*/
unsigned short di_number; /*关联文件数。当为0 时，则删除该文件*/
unsigned short di_mode; /*存取权限*/
unsigned short di_uid;
unsigned short di_gid;
unsigned short di_size; /*文件大小*/
unsigned int di_addr[NADDR]; /*物理块号*/
};
struct dinode{
unsigned short di_number; /*关联文件数*/
unsigned short di_mode; /*存取权限*/
unsigned short di_uid;
unsigned short di_gid;
unsigned short di_size; /*文件大小*/
unsigned int di_addr[NADDR]; /*物理块号*/
};
struct direct{
char d_name[DIRSIZ];
unsigned int d_ino;
};
struct filsys{
unsigned short s_isize; /*i节点块块数*/
unsigned long s_fsize; /*数据块块数*/
unsigned int s_nfree; /*空闲块*/
unsigned short s_pfree; /*空闲块指针*/
unsigned int s_free[NICFREE]; /*空闲块堆栈*/
unsigned int s_ninode; /*number of free inode in s_inode*/
short int s_pinode; /*pointer of the sinode*/
unsigned int s_inode[NICINOD]; /*空闲i节点数组*/
unsigned int s_rinode; /*remember inode*/
char s_fmod; /*超级块修改标志*/
};
struct pwd{
unsigned short p_uid;
unsigned short p_gid;
char password [PWDSIZ];
};
struct dir{
struct direct direct[DIRNUM];
int size; /*当前目录大小*/
};
struct hinode{
struct inode *i_forw; /*HASH表指针*/
};
struct file{
char f_flag; /*文件操作标志*/
unsigned int f_count; /*引用计数*/
struct inode *f_inode; /*指向内存i节点*/
unsigned long f_off; /*read/write character pointer*/
};
struct user{
unsigned short u_default_mode;
unsigned short u_uid;
unsigned short u_gid;
unsigned short u_ofile[NOFILE]; /*用户打开文件表*/
};
//all variables
extern struct hinode hinode[NHINO];
extern struct dir dir; /*当前目录(在内存中全部读入)*/
extern struct file sys_ofile[SYSOPENFILE];
extern struct filsys filsys; /*内存中的超级块*/
extern struct pwd pwd[PWDNUM];
extern struct user user[USERNUM];
//extern struct file *fd; /*the file system column of all the system*/ //xiao
extern struct inode *cur_path_inode;
extern int user_id;
extern char disk[(DINODEBLK+FILEBLK+2)*BLOCKSIZ];
// all functions
extern struct inode *iget(unsigned int);
extern void iput(struct inode *);
extern unsigned int balloc(unsigned int);
extern unsigned int balloc();
extern void bfree(unsigned int);
extern struct inode* ialloc();
extern void ifree(unsigned int);
extern int namei(char *);
extern unsigned short iname(char *);
extern unsigned int access(unsigned int,struct inode *,unsigned short);
extern void _dir();
extern void _pwd(char *);
extern void _rename(char *, char *);
extern void _password(unsigned short, char *, char *);
extern void who(unsigned short);
extern void adduser(unsigned short, unsigned short, char *);
extern void mkdir(char *);
extern void chdir(char *);
extern short open(int,char*,char);
extern int creat(unsigned int,char *,unsigned short);
extern unsigned int read(int fd, char *buf, unsigned int size);
extern unsigned int write(int fd,char *buf,unsigned int size);
extern int login(unsigned short, char *);
extern int logout(unsigned short);
extern void install();
extern void format();
extern void close(unsigned int,int);/*既然read, write都可以用int，没必要接着用unsigned short*/
extern void halt();
extern void delete(char *);
extern int shell(int user_id,char *str);
#endif