filesys.h

基于UNIX6的文件系统模拟程序

#define BLOCKSIZ 512
#define SYSOPENFILE 40
#define DIRNUM 128
#define DIRSIZ 14
#define PWDSIZ 12
#define PWDNUM 32
#define NOFILE 20
#define NADDR 10
#define NHINO 128 /*power of 2*/
#define USERNUM 10
#define DINODESIZ 32

/* filsys */
#define DINODEBLK 32
#define FILEBLK 512//1024
#define NICFREE 50
#define NICINOD 50
#define DINODESTART 2*BLOCKSIZ
#define DATASTART (2+DINODEBLK)*BLOCKSIZ

/* di_mode */
#define DIEMPTY	00000

#define DIFILE	01000
#define DIDIR	02000

#define UDIREAD	00001
#define UDIWRITE	00002
#define UDIEXICUTE	00004
#define GDIREAD	00010
#define GDIWRITE	00020
#define GDIEXICUTE	00040
#define ODIREAD	00100
#define ODIWRITE	00200
#define ODIEXICUTE	00400

#define READ		1
#define WRITE	2
#define EXICUTE	3

#define DEFAULTMODE 00777

/* i_flag*/
#define IUPDATE	00002

/*s_fmod */
#define SUPDATE	00001

/* f_flag */
#define FREAD	00001
#define FWRITE	00002
#define FAPPEND	00007

/* erro */
#define DISKFULL	65535

/* fseek origin */
#define SEEK_SET 	0

		/* filesys struct*/
struct inode{
		struct inode *i_forw;
		struct inode *i_back;
		char i_flag;
		unsigned int i_ino;/*inode flag*/
		unsigned int i_count;/* reference count */
		unsigned short di_number;/*the linked file,when it is 0,delete the file*/
		unsigned short di_mode ; /* access authority */
		unsigned short di_uid;
		unsigned short di_gid;
		unsigned short di_size; /* file size */
		unsigned int di_addr[NADDR]; /* physical block number */
		};

struct dinode{
		unsigned short di_number; /* linked file number */
		unsigned short di_mode; /* access authority */
		unsigned short di_uid;
		unsigned short di_gid;
		unsigned short di_size; /* file size */
		unsigned int di_addr[NADDR]; /* physical */
		};

struct direct{
		char d_name[DIRSIZ];
		unsigned int d_ino;
		};

struct filsys{
		unsigned short s_isize; /* inode blk number */
		unsigned long s_fsize; /* data blk number */ 
		unsigned int s_nfree; /* free blk */
		unsigned short s_pfree; /* free blk pointer */
		unsigned int s_free[NICFREE]; /* free blk stack */
		
		unsigned int s_ninode; /* number of free inode in s_inode */
		unsigned short s_pinode; /* pointer of the s_inode */
		unsigned int s_inode[NICINOD]; /* free inode array */
		unsigned int s_rinode; /*remember inode */

		char s_fmod; /* supper blk Modifyed flag */
		};

struct pwd{
		unsigned short p_uid;
		unsigned short p_gid;
		char password[PWDSIZ];
		};

struct dir{
		struct direct direct[DIRNUM];
		int size; /* the current directory size */
	     };

struct hinode{
			struct inode *i_forw; /* hash table pointer */
		};

struct file {
		char f_flag; /* file opratin flag */
		unsigned int f_count; /* refference count */
		
		struct inode *f_inode; /*point to the inode in memory */
		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]; /* open file table by user*/
		/* system open file pointer number */
		};

		/*global variable below */
extern struct hinode hinode[NHINO];
extern struct dir dir; /* the current direct(read all in memory) */
extern struct file sys_ofile[SYSOPENFILE];
extern struct filsys filsys; /* supper blk in memory */
extern struct pwd pwd[PWDNUM];
extern struct user user[USERNUM];
extern FILE *fd; /* the file system column of all the system */
extern struct inode *cur_path_inode;
extern int user_id;

/*proptype of the sub roution used in the file system */
extern struct inode *iget();
extern iput();
extern unsigned int balloc();
extern bfree();
extern struct inode *ialloc();
extern ifree();
extern unsigned int namei();
extern unsigned short iname();
extern unsigned int access();
extern _dir();
extern mkdir();
extern chdir();
extern unsigned short open();
extern creat();
extern del();
extern unsigned int read();
extern unsigned int write();
extern int seek();
extern int login();
extern int getid();
extern logout();
extern install();
extern format();
extern close();
extern halt();

/*commond line */

extern cmd_login();
extern cmd_ls();
extern cmd_cmd();
extern int Iscmd();