/*
 * 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
#define	NSADDR	(NADDR*sizeof(daddr_t)/sizeof(short))

struct inode_ext
{
	struct inode_ext *ext_next;
	int ext_blkno;
	char ext_info[BSIZE];
};

struct	inode
{
	unsigned char	i_flag;
	cnt_t	i_count;	/* reference count */
	dev_t	i_dev;		/* device where inode resides */
	ino_t	i_number;	/* i number, 1-to-1 with device address */
	ushort	i_mode;
	short	i_nlink;	/* directory entries */
	ushort	i_uid;		/* owner */
	ushort	i_gid;		/* group of owner */
	off_t	i_size;		/* size of file */
	struct {
		union {
			daddr_t i_a[NADDR];	/* if normal file/directory */
			short	i_f[NSADDR];	/* if fifio's */
			dev_t i_r;		/* if device special */
		} i_p;
		daddr_t	i_l;		/* last logical block read (for read-ahead) */
	}i_blks;
	struct inode_ext *i_extend_blk; /* pointers to cached indirect ptr
					   blocks */
};


extern struct inode inode[];	/* The inode table itself */

/* 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 */
#define INOWRT	0200		/* do not write out indirect blocks */

/* modes */
#define	IFMT	0xf000		/* type of file */
#define		IFDIR	0x4000 	/* directory */
#define		IFCHR	0x2000 	/* character special */
#define		IFBLK	0x6000 	/* block special */
#define		IFREG	0x8000 	/* regular */
#define		IFMPC	0x3000 	/* multiplexed char special */
#define		IFMPB	0x7000 	/* multiplexed block special */
#define		IFIFO	0x1000 	/* fifo special */
#define	ISUID	0x800		/* set user id on execution */
#define	ISGID	0x400		/* set group id on execution */
#define ISVTX	0x200		/* save swapped text even after use */
#define	IREAD	0x100		/* read, write, execute permissions */
#define	IWRITE	0x80
#define	IEXEC	0x40

#define	i_addr	i_blks.i_p.i_a
#define	i_lastr	i_blks.i_l
#define	i_rdev	i_blks.i_p.i_r

#define	i_faddr	i_blks.i_p.i_a
#define	NFADDR	10
#define	PIPSIZ	NFADDR*BSIZE
#define	i_frptr	i_blks.i_p.i_f[NSADDR-5]
#define	i_fwptr	i_blks.i_p.i_f[NSADDR-4]
#define	i_frcnt	i_blks.i_p.i_f[NSADDR-3]
#define	i_fwcnt	i_blks.i_p.i_f[NSADDR-2]
#define	i_fflag	i_blks.i_p.i_f[NSADDR-1]
#define	IFIR	01
#define	IFIW	02