[unix-history] / usr / src / sys / ufs / ffs / inode.h

/*	inode.h	4.10	82/02/27	*/

/*
 * The I node is the focus of all file activity in UNIX.
 * There is a unique inode allocated for each active file,
 * each current directory, each mounted-on file, text file, and the root.
 * An inode is 'named' by its dev/inumber pair. (iget/iget.c)
 * Data, from mode on, is read in from permanent inode on volume.
 */
#define	NADDR	13

struct inode {
	char	i_flag;
	char	i_count;	/* reference count */
	dev_t	i_dev;		/* device where inode resides */
	ino_t	i_number;	/* i number, 1-to-1 with device address */
/* begin read from disk */
	u_short	i_mode;
	short	i_nlink;	/* directory entries */
	short	i_uid;		/* owner */
	short	i_gid;		/* group of owner */
	off_t	i_size;		/* size of file */
	union {
		struct i_f {
			daddr_t	if_addr[NADDR];	/* if normal file/directory */
			daddr_t	if_lastr;	/* last read (read-ahead) */
		} i_f;
		struct i_d {
			daddr_t	id_rdev;	/* i_addr[0] */
		} i_d;
		struct i_s {
			struct	socket *is_socket;
		} i_s;
#define	i_addr		i_f.if_addr
#define	i_lastr		i_f.if_lastr
#define	i_rdev		i_d.id_rdev
#define	i_socket	i_s.is_socket
	} i_un;
/* end read from disk */
	short	i_XXXXXX;	/* ### */
/* SHOULD USE POINTERS, NOT INDICES, FOR HAS CHAIN */
	short	i_hlink;	/* link in hash chain (iget/iput/ifind) */
};

#ifdef KERNEL
struct	inode *inode, *inodeNINODE;
int	ninode;

struct	inode *rootdir;		/* pointer to inode of root directory */

struct	inode *ialloc();
struct	inode *ifind();
struct	inode *iget();
struct	inode *owner();
struct	inode *maknode();
struct	inode *namei();
#endif

/* flags */
#define	ILOCK	01		/* inode is locked */
#define	IUPD	02		/* file has been modified */
#define	IACC	04		/* inode access time to be updated */
#define	IMOUNT	010		/* inode is mounted on */
#define	IWANT	020		/* some process waiting on lock */
#define	ITEXT	040		/* inode is pure text prototype */
#define	ICHG	0100		/* inode has been changed */

/* modes */
#define	IFMT	0170000		/* type of file */
#define		IFCHR		0020000		/* character special */
#define		IFDIR		0040000		/* directory */
#define		IFBLK		0060000		/* block special */
#define		IFREG		0100000		/* regular */
#define		IFLNK		0120000		/* symbolic link */
#define		IFPORTAL	0140000		/* portal */
#define	ISUID	04000		/* set user id on execution */
#define	ISGID	02000		/* set group id on execution */
#define	ISVTX	01000		/* save swapped text even after use */
#define	IREAD	0400		/* read, write, execute permissions */
#define	IWRITE	0200
#define	IEXEC	0100
Commit	Line	Data
5485e062	1	/* inode.h 4.10 82/02/27 */
d0064d3a BJ	2
d0064d3a BJ	3	/*
a59abf09 BJ	4	* The I node is the focus of all file activity in UNIX.
	5	* There is a unique inode allocated for each active file,
	6	* each current directory, each mounted-on file, text file, and the root.
	7	* An inode is 'named' by its dev/inumber pair. (iget/iget.c)
	8	* Data, from mode on, is read in from permanent inode on volume.
d0064d3a	9	*/
d0064d3a BJ	10	#define NADDR 13
d0064d3a BJ	11
a59abf09	12	struct inode {
d0064d3a BJ	13	char i_flag;
	14	char i_count; /* reference count */
	15	dev_t i_dev; /* device where inode resides */
	16	ino_t i_number; /* i number, 1-to-1 with device address */
a59abf09 BJ	17	/* begin read from disk */
a59abf09 BJ	18	u_short i_mode;
d0064d3a BJ	19	short i_nlink; /* directory entries */
	20	short i_uid; /* owner */
	21	short i_gid; /* group of owner */
	22	off_t i_size; /* size of file */
	23	union {
541352f0 BJ	24	struct i_f {
	25	daddr_t if_addr[NADDR]; /* if normal file/directory */
	26	daddr_t if_lastr; /* last read (read-ahead) */
0aee3fe5	27	} i_f;
541352f0 BJ	28	struct i_d {
541352f0 BJ	29	daddr_t id_rdev; /* i_addr[0] */
0aee3fe5	30	} i_d;
541352f0 BJ	31	struct i_s {
	32	struct socket *is_socket;
	33	} i_s;
	34	#define i_addr i_f.if_addr
	35	#define i_lastr i_f.if_lastr
	36	#define i_rdev i_d.id_rdev
	37	#define i_socket i_s.is_socket
d0064d3a	38	} i_un;
a59abf09 BJ	39	/* end read from disk */
	40	short i_XXXXXX; /* ### */
	41	/* SHOULD USE POINTERS, NOT INDICES, FOR HAS CHAIN */
d0064d3a BJ	42	short i_hlink; /* link in hash chain (iget/iput/ifind) */
	43	};
	44
	45	#ifdef KERNEL
a0eab615 BJ	46	struct inode inode, inodeNINODE;
a0eab615 BJ	47	int ninode;
d0064d3a BJ	48
d0064d3a BJ	49	struct inode rootdir; / pointer to inode of root directory */
d0064d3a BJ	50
	51	struct inode *ialloc();
	52	struct inode *ifind();
	53	struct inode *iget();
	54	struct inode *owner();
	55	struct inode *maknode();
	56	struct inode *namei();
	57	#endif
	58
	59	/* flags */
	60	#define ILOCK 01 /* inode is locked */
	61	#define IUPD 02 /* file has been modified */
	62	#define IACC 04 /* inode access time to be updated */
	63	#define IMOUNT 010 /* inode is mounted on */
	64	#define IWANT 020 /* some process waiting on lock */
	65	#define ITEXT 040 /* inode is pure text prototype */
	66	#define ICHG 0100 /* inode has been changed */
	67
	68	/* modes */
	69	#define IFMT 0170000 /* type of file */
541352f0 BJ	70	#define IFCHR 0020000 /* character special */
	71	#define IFDIR 0040000 /* directory */
	72	#define IFBLK 0060000 /* block special */
	73	#define IFREG 0100000 /* regular */
5485e062	74	#define IFLNK 0120000 /* symbolic link */
541352f0	75	#define IFPORTAL 0140000 /* portal */
d0064d3a BJ	76	#define ISUID 04000 /* set user id on execution */
	77	#define ISGID 02000 /* set group id on execution */
	78	#define ISVTX 01000 /* save swapped text even after use */
	79	#define IREAD 0400 /* read, write, execute permissions */
	80	#define IWRITE 0200
	81	#define IEXEC 0100