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 /*      $OpenBSD: dinode.h,v 1.17 2007/06/02 01:32:04 pedro Exp $       */
    2 /*      $NetBSD: dinode.h,v 1.7 1995/06/15 23:22:48 cgd Exp $   */
    3 
    4 /*
    5  * Copyright (c) 1982, 1989, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  * (c) UNIX System Laboratories, Inc.
    8  * All or some portions of this file are derived from material licensed
    9  * to the University of California by American Telephone and Telegraph
   10  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   11  * the permission of UNIX System Laboratories, Inc.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      @(#)dinode.h    8.9 (Berkeley) 3/29/95
   38  */
   39 
   40 #ifndef _UFS_DINODE_H_
   41 #define _UFS_DINODE_H_
   42 
   43 /*
   44  * The root inode is the root of the file system.  Inode 0 can't be used for
   45  * normal purposes and historically bad blocks were linked to inode 1, thus
   46  * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
   47  * numerous dump tapes make this assumption, so we are stuck with it).
   48  */
   49 #define ROOTINO ((ino_t)2)
   50 
   51 /*
   52  * A dinode contains all the meta-data associated with a UFS file.
   53  * This structure defines the on-disk format of a dinode. Since
   54  * this structure describes an on-disk structure, all its fields
   55  * are defined by types with precise widths.
   56  */
   57 #define NXADDR  2                       /* External addresses in inode */
   58 #define NDADDR  12                      /* Direct addresses in inode. */
   59 #define NIADDR  3                       /* Indirect addresses in inode. */
   60 
   61 struct  ufs1_dinode {
   62         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
   63         int16_t         di_nlink;       /*   2: File link count. */
   64         union {
   65                 u_int16_t oldids[2];    /*   4: Ffs: old user and group ids. */
   66                 u_int32_t inumber;      /*   4: Lfs: inode number. */
   67         } di_u;
   68         u_int64_t       di_size;        /*   8: File byte count. */
   69         int32_t         di_atime;       /*  16: Last access time. */
   70         int32_t         di_atimensec;   /*  20: Last access time. */
   71         int32_t         di_mtime;       /*  24: Last modified time. */
   72         int32_t         di_mtimensec;   /*  28: Last modified time. */
   73         int32_t         di_ctime;       /*  32: Last inode change time. */
   74         int32_t         di_ctimensec;   /*  36: Last inode change time. */
   75         int32_t         di_db[NDADDR];  /*  40: Direct disk blocks. */
   76         int32_t         di_ib[NIADDR];  /*  88: Indirect disk blocks. */
   77         u_int32_t       di_flags;       /* 100: Status flags (chflags). */
   78         int32_t         di_blocks;      /* 104: Blocks actually held. */
   79         int32_t         di_gen;         /* 108: Generation number. */
   80         u_int32_t       di_uid;         /* 112: File owner. */
   81         u_int32_t       di_gid;         /* 116: File group. */
   82         int32_t         di_spare[2];    /* 120: Reserved; currently unused */
   83 };
   84 
   85 struct ufs2_dinode {
   86         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
   87         int16_t         di_nlink;       /*   2: File link count. */
   88         u_int32_t       di_uid;         /*   4: File owner. */
   89         u_int32_t       di_gid;         /*   8: File group. */
   90         u_int32_t       di_blksize;     /*  12: Inode blocksize. */
   91         u_int64_t       di_size;        /*  16: File byte count. */
   92         u_int64_t       di_blocks;      /*  24: Bytes actually held. */
   93         int64_t         di_atime;       /*  32: Last access time. */
   94         int64_t         di_mtime;       /*  40: Last modified time. */
   95         int64_t         di_ctime;       /*  48: Last inode change time. */
   96         int64_t         di_birthtime;   /*  56: Inode creation time. */
   97         int32_t         di_mtimensec;   /*  64: Last modified time. */
   98         int32_t         di_atimensec;   /*  68: Last access time. */
   99         int32_t         di_ctimensec;   /*  72: Last inode change time. */
  100         int32_t         di_birthnsec;   /*  76: Inode creation time. */
  101         int32_t         di_gen;         /*  80: Generation number. */
  102         u_int32_t       di_kernflags;   /*  84: Kernel flags. */
  103         u_int32_t       di_flags;       /*  88: Status flags (chflags). */
  104         int32_t         di_extsize;     /*  92: External attributes block. */
  105         int64_t         di_extb[NXADDR];/*  96: External attributes block. */
  106         int64_t         di_db[NDADDR];  /* 112: Direct disk blocks. */
  107         int64_t         di_ib[NIADDR];  /* 208: Indirect disk blocks. */
  108         int64_t         di_spare[3];    /* 232: Reserved; currently unused */
  109 };
  110 
  111 /*
  112  * The di_db fields may be overlaid with other information for
  113  * file types that do not have associated disk storage. Block
  114  * and character devices overlay the first data block with their
  115  * dev_t value. Short symbolic links place their path in the
  116  * di_db area.
  117  */
  118 #define di_inumber      di_u.inumber
  119 #define di_ogid         di_u.oldids[1]
  120 #define di_ouid         di_u.oldids[0]
  121 #define di_rdev         di_db[0]
  122 #define di_shortlink    di_db
  123 
  124 #define MAXSYMLINKLEN_UFS1      ((NDADDR + NIADDR) * sizeof(int32_t))
  125 #define MAXSYMLINKLEN_UFS2      ((NDADDR + NIADDR) * sizeof(int64_t))
  126 
  127 #define MAXSYMLINKLEN(ip) \
  128         ((ip)->i_ump->um_fstype == UM_UFS1) ? \
  129         MAXSYMLINKLEN_UFS1 : MAXSYMLINKLEN_UFS2
  130 
  131 /* File permissions. */
  132 #define IEXEC           0000100         /* Executable. */
  133 #define IWRITE          0000200         /* Writeable. */
  134 #define IREAD           0000400         /* Readable. */
  135 #define ISVTX           0001000         /* Sticky bit. */
  136 #define ISGID           0002000         /* Set-gid. */
  137 #define ISUID           0004000         /* Set-uid. */
  138 
  139 /* File types. */
  140 #define IFMT            0170000         /* Mask of file type. */
  141 #define IFIFO           0010000         /* Named pipe (fifo). */
  142 #define IFCHR           0020000         /* Character device. */
  143 #define IFDIR           0040000         /* Directory file. */
  144 #define IFBLK           0060000         /* Block device. */
  145 #define IFREG           0100000         /* Regular file. */
  146 #define IFLNK           0120000         /* Symbolic link. */
  147 #define IFSOCK          0140000         /* UNIX domain socket. */
  148 #define IFWHT           0160000         /* Whiteout. */
  149 
  150 #endif /* _UFS_DINODE_H_ */

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