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 /*      $NetBSD: dinode.h,v 1.21 2009/06/28 09:26:18 ad Exp $   */
    2 
    3 /*
    4  * Copyright (c) 2002 Networks Associates Technology, Inc.
    5  * All rights reserved.
    6  *
    7  * This software was developed for the FreeBSD Project by Marshall
    8  * Kirk McKusick and Network Associates Laboratories, the Security
    9  * Research Division of Network Associates, Inc. under DARPA/SPAWAR
   10  * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
   11  * research program
   12  *
   13  * Copyright (c) 1982, 1989, 1993
   14  *      The Regents of the University of California.  All rights reserved.
   15  * (c) UNIX System Laboratories, Inc.
   16  * All or some portions of this file are derived from material licensed
   17  * to the University of California by American Telephone and Telegraph
   18  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   19  * the permission of UNIX System Laboratories, Inc.
   20  *
   21  * Redistribution and use in source and binary forms, with or without
   22  * modification, are permitted provided that the following conditions
   23  * are met:
   24  * 1. Redistributions of source code must retain the above copyright
   25  *    notice, this list of conditions and the following disclaimer.
   26  * 2. Redistributions in binary form must reproduce the above copyright
   27  *    notice, this list of conditions and the following disclaimer in the
   28  *    documentation and/or other materials provided with the distribution.
   29  * 3. Neither the name of the University nor the names of its contributors
   30  *    may be used to endorse or promote products derived from this software
   31  *    without specific prior written permission.
   32  *
   33  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   43  * SUCH DAMAGE.
   44  *
   45  *      @(#)dinode.h    8.9 (Berkeley) 3/29/95
   46  */
   47 
   48 /*
   49  * NOTE: COORDINATE ON-DISK FORMAT CHANGES WITH THE FREEBSD PROJECT.
   50  */
   51 
   52 #ifndef _UFS_UFS_DINODE_H_
   53 #define _UFS_UFS_DINODE_H_
   54 
   55 /*
   56  * The root inode is the root of the file system.  Inode 0 can't be used for
   57  * normal purposes and historically bad blocks were linked to inode 1, thus
   58  * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
   59  * numerous dump tapes make this assumption, so we are stuck with it).
   60  */
   61 #define ROOTINO ((ino_t)2)
   62 
   63 /*
   64  * The Whiteout inode# is a dummy non-zero inode number which will
   65  * never be allocated to a real file.  It is used as a place holder
   66  * in the directory entry which has been tagged as a DT_W entry.
   67  * See the comments about ROOTINO above.
   68  */
   69 #define WINO    ((ino_t)1)
   70 
   71 /*
   72  * A dinode contains all the meta-data associated with a UFS file.
   73  * This structure defines the on-disk format of a dinode. Since
   74  * this structure describes an on-disk structure, all its fields
   75  * are defined by types with precise widths.
   76  */
   77 
   78 #define NXADDR  2
   79 #define NDADDR  12                      /* Direct addresses in inode. */
   80 #define NIADDR  3                       /* Indirect addresses in inode. */
   81 
   82 struct ufs1_dinode {
   83         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
   84         int16_t         di_nlink;       /*   2: File link count. */
   85         union {
   86                 u_int16_t oldids[2];    /*   4: Ffs: old user and group ids. */
   87                 u_int32_t inumber;      /*   4: Lfs: inode number. */
   88         } di_u;
   89         u_int64_t       di_size;        /*   8: File byte count. */
   90         int32_t         di_atime;       /*  16: Last access time. */
   91         int32_t         di_atimensec;   /*  20: Last access time. */
   92         int32_t         di_mtime;       /*  24: Last modified time. */
   93         int32_t         di_mtimensec;   /*  28: Last modified time. */
   94         int32_t         di_ctime;       /*  32: Last inode change time. */
   95         int32_t         di_ctimensec;   /*  36: Last inode change time. */
   96         int32_t         di_db[NDADDR];  /*  40: Direct disk blocks. */
   97         int32_t         di_ib[NIADDR];  /*  88: Indirect disk blocks. */
   98         u_int32_t       di_flags;       /* 100: Status flags (chflags). */
   99         u_int32_t       di_blocks;      /* 104: Blocks actually held. */
  100         int32_t         di_gen;         /* 108: Generation number. */
  101         u_int32_t       di_uid;         /* 112: File owner. */
  102         u_int32_t       di_gid;         /* 116: File group. */
  103         u_int64_t       di_modrev;      /* 120: i_modrev for NFSv4 */
  104 };
  105 
  106 struct ufs2_dinode {
  107         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
  108         int16_t         di_nlink;       /*   2: File link count. */
  109         u_int32_t       di_uid;         /*   4: File owner. */
  110         u_int32_t       di_gid;         /*   8: File group. */
  111         u_int32_t       di_blksize;     /*  12: Inode blocksize. */
  112         u_int64_t       di_size;        /*  16: File byte count. */
  113         u_int64_t       di_blocks;      /*  24: Bytes actually held. */
  114         int64_t         di_atime;       /*  32: Last access time. */
  115         int64_t         di_mtime;       /*  40: Last modified time. */
  116         int64_t         di_ctime;       /*  48: Last inode change time. */
  117         int64_t         di_birthtime;   /*  56: Inode creation time. */
  118         int32_t         di_mtimensec;   /*  64: Last modified time. */
  119         int32_t         di_atimensec;   /*  68: Last access time. */
  120         int32_t         di_ctimensec;   /*  72: Last inode change time. */
  121         int32_t         di_birthnsec;   /*  76: Inode creation time. */
  122         int32_t         di_gen;         /*  80: Generation number. */
  123         u_int32_t       di_kernflags;   /*  84: Kernel flags. */
  124         u_int32_t       di_flags;       /*  88: Status flags (chflags). */
  125         int32_t         di_extsize;     /*  92: External attributes block. */
  126         int64_t         di_extb[NXADDR];/*  96: External attributes block. */
  127         int64_t         di_db[NDADDR];  /* 112: Direct disk blocks. */
  128         int64_t         di_ib[NIADDR];  /* 208: Indirect disk blocks. */
  129         u_int64_t       di_modrev;      /* 232: i_modrev for NFSv4 */
  130         int64_t         di_spare[2];    /* 240: Reserved; currently unused */
  131 };
  132 
  133 /*
  134  * The di_db fields may be overlaid with other information for
  135  * file types that do not have associated disk storage. Block
  136  * and character devices overlay the first data block with their
  137  * dev_t value. Short symbolic links place their path in the
  138  * di_db area.
  139  */
  140 #define di_inumber      di_u.inumber
  141 #define di_ogid         di_u.oldids[1]
  142 #define di_ouid         di_u.oldids[0]
  143 #define di_rdev         di_db[0]
  144 #define MAXSYMLINKLEN_UFS1      ((NDADDR + NIADDR) * sizeof(int32_t))
  145 #define MAXSYMLINKLEN_UFS2      ((NDADDR + NIADDR) * sizeof(int64_t))
  146 
  147 #define MAXSYMLINKLEN(ip) \
  148         ((ip)->i_ump->um_fstype == UFS1) ? \
  149         MAXSYMLINKLEN_UFS1 : MAXSYMLINKLEN_UFS2
  150 
  151 /* NeXT used to keep short symlinks in the inode even when using
  152  * FS_42INODEFMT.  In that case fs->fs_maxsymlinklen is probably -1,
  153  * but short symlinks were stored in inodes shorter than this:
  154  */
  155 #define APPLEUFS_MAXSYMLINKLEN 60
  156 
  157 /* File permissions. */
  158 #define IEXEC           0000100         /* Executable. */
  159 #define IWRITE          0000200         /* Writable. */
  160 #define IREAD           0000400         /* Readable. */
  161 #define ISVTX           0001000         /* Sticky bit. */
  162 #define ISGID           0002000         /* Set-gid. */
  163 #define ISUID           0004000         /* Set-uid. */
  164 
  165 /* File types. */
  166 #define IFMT            0170000         /* Mask of file type. */
  167 #define IFIFO           0010000         /* Named pipe (fifo). */
  168 #define IFCHR           0020000         /* Character device. */
  169 #define IFDIR           0040000         /* Directory file. */
  170 #define IFBLK           0060000         /* Block device. */
  171 #define IFREG           0100000         /* Regular file. */
  172 #define IFLNK           0120000         /* Symbolic link. */
  173 #define IFSOCK          0140000         /* UNIX domain socket. */
  174 #define IFWHT           0160000         /* Whiteout. */
  175 
  176 /* Size of the on-disk inode. */
  177 #define DINODE1_SIZE    (sizeof(struct ufs1_dinode))            /* 128 */
  178 #define DINODE2_SIZE    (sizeof(struct ufs2_dinode))
  179 
  180 #endif /* !_UFS_UFS_DINODE_H_ */

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