/*
	* Disk inode structure. See below for the structure
	* used inside the kernel.
	*/
struct dsknod
	{
	UINT	mode;		/* see below */
	char	nlinks;		/* number of directory links */
	UCHAR	uid;		/* user id of owner */
	UCHAR	gid;		/* group id of owner */
	UCHAR	size0;		/* high byte of 24-bit size */
	UINT	size1;		/* low word of 24-bit size */
	UINT	addr[8];	/* block numbers or device number */
	ULONG	rtime;		/* time of last read */
	ULONG	wtime;		/* time of last write */
	};

       /*
	* Internal inode structure.
	* (The stat system calls know the order of the first 36 bytes.)
	*/
struct inode
	{
	UINT		dev;		/* device number */
	UINT		inum;		/* inumber */

	UINT		mode;		/* see below */
	UCHAR		nlinks;		/* number of directory links */
	UCHAR		uid;		/* user id of owner */
	UCHAR		gid;		/* group id of owner */
	UCHAR		size0;		/* high byte of 24-bit size */
	UINT		size1;		/* low word of 24-bit size */
	UINT		addr[8];	/* block numbers or device number */
	ULONG		rtime;		/* time of last read */
	ULONG		wtime;		/* time of last write */

	UCHAR		flags;		/* see below */
	char		count;		/* count of in-core references */
	struct mount *	mount;		/* mounted on this inode */
	ULONG		size;		/* for computational convenience */
	UINT		time;		/* "time" of last reference */
	}
	ilist[];

       /*
	* Mode bits.
	*/
#define IALLOC	0100000 /* inode is allocated */
#define ITYPE	 060000 /* 2-bit file type mask */
#define	 IIO	 020000 /* mask to identify io files */
#define	 IBIO	 060000 /* block-type io file */
#define	 ICIO	 020000 /* char-type io file */
#define	 IDIR	 040000 /* directory */
#define	 IORD	 000000 /* ordinary file */
#define ILARGE	 010000 /* large-file addressing */
#define ISETUID	  04000 /* set user-id on execution */
#define ISETGID	  02000 /* set group-id on execution */
#define I1WRITE	  01000 /* allow only one writer */
#define IOWNER	   0700 /* owner permisions mask */
#define IGROUP	    070 /* group permissions mask */
#define IOTHER	     07 /* other permissions mask */
#define	 IREAD	     04 /* read permission */
#define	 IWRITE	     02 /* write permission */
#define	 IEXEC	     01 /* execute permission */

       /*
	* Flag bits
	*/
#define IBUSY	1	/* changing: do not access */
#define IMOD	2	/* inode has been modified */
#define IWANT	4	/* wakeup address of inode on release */
#define IRONLY	8	/* device is mounted read-only */
#define IWRLOCK 16	/* do not open for writing */
#define IPIPE	32	/* delay disk write of full blocks */