.ref-Research-V6/usr/sys/ino.h

/*
 * Inode structure as it appears on
 * the disk. Not used by the system,
 * but by things like check, df, dump.
 */
struct  inode
{
        int     i_mode;
        char    i_nlink;
        char    i_uid;
        char    i_gid;
        char    i_size0;
        char    *i_size1;
        int     i_addr[8];
        int     i_atime[2];
        int     i_mtime[2];
};

/* 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 ISVTX   01000
#define IREAD   0400
#define IWRITE  0200
#define IEXEC   0100