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

/*
 * Copyright (c) 1982, 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)dinode.h    8.5 (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)

/*
 * The Whiteout inode# is a dummy non-zero inode number which will
 * never be allocated to a real file.  It is used as a place holder
 * in the directory entry which has been tagged as a DT_W entry.
 * See the comments about ROOTINO above.
 */
#define WINO    ((ino_t)1)

/*
 * 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_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
        int16_t         di_nlink;       /*   2: File link count. */
        union {
                u_int16_t oldids[2];    /*   4: Ffs: old user and group ids. */
                ino_t     inumber;      /*   4: Lfs: inode number. */
        } di_u;
        u_quad_t        di_size;        /*   8: File byte count. */
        struct timespec di_atime;       /*  16: Last access time. */
        struct timespec di_mtime;       /*  24: Last modified time. */
        struct timespec di_ctime;       /*  32: Last inode change time. */
        daddr_t         di_db[NDADDR];  /*  40: Direct disk blocks. */
        daddr_t         di_ib[NIADDR];  /*  88: Indirect disk blocks. */
        u_int32_t       di_flags;       /* 100: Status flags (chflags). */
        int32_t         di_blocks;      /* 104: Blocks actually held. */
        int32_t         di_gen;         /* 108: Generation number. */
        u_int32_t       di_uid;         /* 112: File owner. */
        u_int32_t       di_gid;         /* 116: File group. */
        int32_t         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_inumber      di_u.inumber
#define di_ogid         di_u.oldids[1]
#define di_ouid         di_u.oldids[0]
#define di_rdev         di_db[0]
#define di_shortlink    di_db
#define MAXSYMLINKLEN   ((NDADDR + NIADDR) * sizeof(daddr_t))

/* File permissions. */
#define IEXEC           0000100         /* Executable. */
#define IWRITE          0000200         /* Writeable. */
#define IREAD           0000400         /* Readable. */
#define ISVTX           0001000         /* Sticky bit. */
#define ISGID           0002000         /* Set-gid. */
#define ISUID           0004000         /* Set-uid. */

/* File types. */
#define IFMT            0170000         /* Mask of file type. */
#define IFIFO           0010000         /* Named pipe (fifo). */
#define IFCHR           0020000         /* Character device. */
#define IFDIR           0040000         /* Directory file. */
#define IFBLK           0060000         /* Block device. */
#define IFREG           0100000         /* Regular file. */
#define IFLNK           0120000         /* Symbolic link. */
#define IFSOCK          0140000         /* UNIX domain socket. */