/* * 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