usr/src/sys/ufs/ufs/dinode.h

/*
 * Copyright (c) 1982, 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)dinode.h    7.20 (Berkeley) %G%
 */

/*
 * The root inode is the root of the file system.  Inode 0 can't be used for
 * normal purposes and historically bad blocks were linked to inode 1, thus
 * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
 * numerous dump tapes make this assumption, so we are stuck with it).
 */
#define ROOTINO ((ino_t)2)

/*
 * A dinode contains all the meta-data associated with a UFS file.
 * This structure defines the on-disk format of a dinode.
 */

#define NDADDR  12              /* direct addresses in inode */
#define NIADDR  3               /* indirect addresses in inode */

struct dinode {
        u_short         di_mode;        /*   0: mode and type of file */
        short           di_nlink;       /*   2: number of links to file */
        union {
                u_short oldids[2];      /*   4: ffs: old user and group ids */
                ino_t   inumber;        /*   4: lfs: inode number */
        } di_u;
        u_quad_t        di_size;        /*   8: number of bytes in file */
        struct timespec di_atime;       /*  16: time last accessed */
        struct timespec di_mtime;       /*  24: time last modified */
        struct timespec di_ctime;       /*  32: last time inode changed */
        daddr_t         di_db[NDADDR];  /*  40: disk block addresses */
        daddr_t         di_ib[NIADDR];  /*  88: indirect blocks */
        u_long          di_flags;       /* 100: status flags */
        long            di_blocks;      /* 104: blocks actually held */
        long            di_gen;         /* 108: generation number */
        u_long          di_uid;         /* 112: owner's user id */
        u_long          di_gid;         /* 116: owner's group id */
        long            di_spare[2];    /* 120: reserved, currently unused */
};

/*
 * The di_db fields may be overlaid with other information for
 * file types that do not have associated disk storage. Block
 * and character devices overlay the first data block with their
 * dev_t value. Short symbolic links place their path in the
 * di_db area.
 */
#define di_ouid         di_u.oldids[0]
#define di_ogid         di_u.oldids[1]
#define di_inumber      di_u.inumber
#define di_rdev         di_db[0]
#define di_shortlink    di_db
#define MAXSYMLINKLEN   ((NDADDR + NIADDR) * sizeof(daddr_t))

/* file modes */
#define IFMT            0170000         /* mask of file type */
#define IFIFO           0010000         /* named pipe (fifo) */
#define IFCHR           0020000         /* character special device */
#define IFDIR           0040000         /* directory */
#define IFBLK           0060000         /* block special device */
#define IFREG           0100000         /* regular file */
#define IFLNK           0120000         /* symbolic link */
#define IFSOCK          0140000         /* UNIX domain socket */

#define ISUID           04000           /* set user identifier when exec'ing */
#define ISGID           02000           /* set group identifier when exec'ing */
#define ISVTX           01000           /* save execution information on exit */
#define IREAD           0400            /* read permission */
#define IWRITE          0200            /* write permission */
#define IEXEC           0100            /* execute permission */