.ref-Research-V4/sys/inode.h

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