[unix-history] / usr / sys / inode.h

/*
 * 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.
 */
struct	inode
{
	char	i_flag;
	char	i_count;	/* reference count */
	int	i_dev;		/* device where inode resides */
	int	i_number;	/* i number, 1-to-1 with device address */
	int	i_mode;
	char	i_nlink;	/* directory entries */
	char	i_uid;		/* owner */
	char	i_gid;		/* group of owner */
	char	i_size0;	/* most significant of size */
	char	*i_size1;	/* least sig */
	int	i_addr[8];	/* device addresses constituting file */
	int	i_lastr;	/* last logical block read (for read-ahead) */
} inode[NINODE];

/* flags */
#define	ILOCK	01		/* inode is locked */
#define	IUPD	02		/* inode 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 */

/* modes */
#define	IALLOC	0100000		/* file is used */
#define	IFMT	060000		/* type of file */
#define		IFDIR	040000	/* directory */
#define		IFCHR	020000	/* character special */
#define		IFBLK	060000	/* block special, 0 is regular */
#define	ILARG	010000		/* large addressing algorithm */
#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
86bf84ea KT	1	/*
	2	* The I node is the focus of all
	3	* file activity in unix. There is a unique
	4	* inode allocated for each active file,
	5	* each current directory, each mounted-on
	6	* file, text file, and the root. An inode is 'named'
	7	* by its dev/inumber pair. (iget/iget.c)
	8	* Data, from mode on, is read in
	9	* from permanent inode on volume.
	10	*/
	11	struct inode
	12	{
	13	char i_flag;
	14	char i_count; /* reference count */
	15	int i_dev; /* device where inode resides */
	16	int i_number; /* i number, 1-to-1 with device address */
	17	int i_mode;
	18	char i_nlink; /* directory entries */
	19	char i_uid; /* owner */
	20	char i_gid; /* group of owner */
	21	char i_size0; /* most significant of size */
	22	char i_size1; / least sig */
	23	int i_addr[8]; /* device addresses constituting file */
	24	int i_lastr; /* last logical block read (for read-ahead) */
	25	} inode[NINODE];
	26
	27	/* flags */
	28	#define ILOCK 01 /* inode is locked */
	29	#define IUPD 02 /* inode has been modified */
	30	#define IACC 04 /* inode access time to be updated */
	31	#define IMOUNT 010 /* inode is mounted on */
	32	#define IWANT 020 /* some process waiting on lock */
	33	#define ITEXT 040 /* inode is pure text prototype */
	34
	35	/* modes */
	36	#define IALLOC 0100000 /* file is used */
	37	#define IFMT 060000 /* type of file */
	38	#define IFDIR 040000 /* directory */
	39	#define IFCHR 020000 /* character special */
	40	#define IFBLK 060000 /* block special, 0 is regular */
	41	#define ILARG 010000 /* large addressing algorithm */
	42	#define ISUID 04000 /* set user id on execution */
	43	#define ISGID 02000 /* set group id on execution */
	44	#define ISVTX 01000 /* save swapped text even after use */
	45	#define IREAD 0400 /* read, write, execute permissions */
	46	#define IWRITE 0200
	47	#define IEXEC 0100