struct inode {
char i_flag;
char i_count;
int i_dev;
int i_number;
int i_mode;
char i_nlink;
char i_uid;
char i_gid;
char i_size0;
char *i_size1;
int i_addr[8];
} inode[NINODE];
/* flags */
#define ILOCK 01
#define IUPD 02
#define IACC 04
#define IMOUNT 010
#define IWANT 020
#define ITEXT 040
/* modes */
#define IALLOC 0100000
#define IFMT 060000
#define IFDIR 040000
#define IFCHR 020000
#define IFBLK 060000
#define ILARG 010000
#define ISUID 04000
#define ISGID 02000
#define IREAD 0400
#define IWRITE 0200
#define IEXEC 0100