The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/ufs/ufs/dinode.h

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    1 /*
    2  * Copyright (c) 1982, 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)dinode.h    8.3 (Berkeley) 1/21/94
   39  * $FreeBSD: stable/3/sys/ufs/ufs/dinode.h 50583 1999-08-29 16:33:42Z peter $
   40  */
   41 
   42 #ifndef _UFS_UFS_DINODE_H_
   43 #define _UFS_UFS_DINODE_H_
   44 
   45 /*
   46  * The root inode is the root of the file system.  Inode 0 can't be used for
   47  * normal purposes and historically bad blocks were linked to inode 1, thus
   48  * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
   49  * numerous dump tapes make this assumption, so we are stuck with it).
   50  */
   51 #define ROOTINO ((ino_t)2)
   52 
   53 /*
   54  * The Whiteout inode# is a dummy non-zero inode number which will
   55  * never be allocated to a real file.  It is used as a place holder
   56  * in the directory entry which has been tagged as a DT_W entry.
   57  * See the comments about ROOTINO above.
   58  */
   59 #define WINO    ((ino_t)1)
   60 
   61 /*
   62  * A dinode contains all the meta-data associated with a UFS file.
   63  * This structure defines the on-disk format of a dinode. Since
   64  * this structure describes an on-disk structure, all its fields
   65  * are defined by types with precise widths.
   66  */
   67 
   68 /* typedef int32_t ufs_daddr_t; */
   69 #define NDADDR  12                      /* Direct addresses in inode. */
   70 #define NIADDR  3                       /* Indirect addresses in inode. */
   71 
   72 struct dinode {
   73         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
   74         int16_t         di_nlink;       /*   2: File link count. */
   75         union {
   76                 u_int16_t oldids[2];    /*   4: Ffs: old user and group ids. */
   77                 int32_t   inumber;      /*   4: Lfs: inode number. */
   78         } di_u;
   79         u_int64_t       di_size;        /*   8: File byte count. */
   80         int32_t         di_atime;       /*  16: Last access time. */
   81         int32_t         di_atimensec;   /*  20: Last access time. */
   82         int32_t         di_mtime;       /*  24: Last modified time. */
   83         int32_t         di_mtimensec;   /*  28: Last modified time. */
   84         int32_t         di_ctime;       /*  32: Last inode change time. */
   85         int32_t         di_ctimensec;   /*  36: Last inode change time. */
   86         ufs_daddr_t     di_db[NDADDR];  /*  40: Direct disk blocks. */
   87         ufs_daddr_t     di_ib[NIADDR];  /*  88: Indirect disk blocks. */
   88         u_int32_t       di_flags;       /* 100: Status flags (chflags). */
   89         int32_t         di_blocks;      /* 104: Blocks actually held. */
   90         int32_t         di_gen;         /* 108: Generation number. */
   91         u_int32_t       di_uid;         /* 112: File owner. */
   92         u_int32_t       di_gid;         /* 116: File group. */
   93         int32_t         di_spare[2];    /* 120: Reserved; currently unused */
   94 };
   95 
   96 /*
   97  * The di_db fields may be overlaid with other information for
   98  * file types that do not have associated disk storage. Block
   99  * and character devices overlay the first data block with their
  100  * dev_t value. Short symbolic links place their path in the
  101  * di_db area.
  102  */
  103 #define di_inumber      di_u.inumber
  104 #define di_ogid         di_u.oldids[1]
  105 #define di_ouid         di_u.oldids[0]
  106 #define di_rdev         di_db[0]
  107 #define di_shortlink    di_db
  108 #define MAXSYMLINKLEN   ((NDADDR + NIADDR) * sizeof(ufs_daddr_t))
  109 
  110 /* File permissions. */
  111 #define IEXEC           0000100         /* Executable. */
  112 #define IWRITE          0000200         /* Writeable. */
  113 #define IREAD           0000400         /* Readable. */
  114 #define ISVTX           0001000         /* Sticky bit. */
  115 #define ISGID           0002000         /* Set-gid. */
  116 #define ISUID           0004000         /* Set-uid. */
  117 
  118 /* File types. */
  119 #define IFMT            0170000         /* Mask of file type. */
  120 #define IFIFO           0010000         /* Named pipe (fifo). */
  121 #define IFCHR           0020000         /* Character device. */
  122 #define IFDIR           0040000         /* Directory file. */
  123 #define IFBLK           0060000         /* Block device. */
  124 #define IFREG           0100000         /* Regular file. */
  125 #define IFLNK           0120000         /* Symbolic link. */
  126 #define IFSOCK          0140000         /* UNIX domain socket. */
  127 #define IFWHT           0160000         /* Whiteout. */
  128 
  129 #endif

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