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) 2002 Networks Associates Technology, Inc.
    3  * All rights reserved.
    4  *
    5  * This software was developed for the FreeBSD Project by Marshall
    6  * Kirk McKusick and Network Associates Laboratories, the Security
    7  * Research Division of Network Associates, Inc. under DARPA/SPAWAR
    8  * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
    9  * research program
   10  *
   11  * Copyright (c) 1982, 1989, 1993
   12  *      The Regents of the University of California.  All rights reserved.
   13  * (c) UNIX System Laboratories, Inc.
   14  * All or some portions of this file are derived from material licensed
   15  * to the University of California by American Telephone and Telegraph
   16  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   17  * the permission of UNIX System Laboratories, Inc.
   18  *
   19  * Redistribution and use in source and binary forms, with or without
   20  * modification, are permitted provided that the following conditions
   21  * are met:
   22  * 1. Redistributions of source code must retain the above copyright
   23  *    notice, this list of conditions and the following disclaimer.
   24  * 2. Redistributions in binary form must reproduce the above copyright
   25  *    notice, this list of conditions and the following disclaimer in the
   26  *    documentation and/or other materials provided with the distribution.
   27  * 3. The names of the authors may not be used to endorse or promote
   28  *    products derived from this software without specific prior written
   29  *    permission.
   30  *
   31  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   34  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   35  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   39  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   40  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   41  * SUCH DAMAGE.
   42  *
   43  *      @(#)dinode.h    8.3 (Berkeley) 1/21/94
   44  * $FreeBSD: releng/5.0/sys/ufs/ufs/dinode.h 100201 2002-07-16 22:36:00Z mckusick $
   45  */
   46 
   47 #ifndef _UFS_UFS_DINODE_H_
   48 #define _UFS_UFS_DINODE_H_
   49 
   50 /*
   51  * The root inode is the root of the filesystem.  Inode 0 can't be used for
   52  * normal purposes and historically bad blocks were linked to inode 1, thus
   53  * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
   54  * numerous dump tapes make this assumption, so we are stuck with it).
   55  */
   56 #define ROOTINO ((ino_t)2)
   57 
   58 /*
   59  * The Whiteout inode# is a dummy non-zero inode number which will
   60  * never be allocated to a real file.  It is used as a place holder
   61  * in the directory entry which has been tagged as a DT_W entry.
   62  * See the comments about ROOTINO above.
   63  */
   64 #define WINO    ((ino_t)1)
   65 
   66 /*
   67  * The size of physical and logical block numbers and time fields in UFS.
   68  */
   69 typedef int32_t ufs1_daddr_t;
   70 typedef int64_t ufs2_daddr_t;
   71 typedef int64_t ufs_lbn_t;
   72 typedef int64_t ufs_time_t;
   73 
   74 /* File permissions. */
   75 #define IEXEC           0000100         /* Executable. */
   76 #define IWRITE          0000200         /* Writeable. */
   77 #define IREAD           0000400         /* Readable. */
   78 #define ISVTX           0001000         /* Sticky bit. */
   79 #define ISGID           0002000         /* Set-gid. */
   80 #define ISUID           0004000         /* Set-uid. */
   81 
   82 /* File types. */
   83 #define IFMT            0170000         /* Mask of file type. */
   84 #define IFIFO           0010000         /* Named pipe (fifo). */
   85 #define IFCHR           0020000         /* Character device. */
   86 #define IFDIR           0040000         /* Directory file. */
   87 #define IFBLK           0060000         /* Block device. */
   88 #define IFREG           0100000         /* Regular file. */
   89 #define IFLNK           0120000         /* Symbolic link. */
   90 #define IFSOCK          0140000         /* UNIX domain socket. */
   91 #define IFWHT           0160000         /* Whiteout. */
   92 
   93 /*
   94  * A dinode contains all the meta-data associated with a UFS2 file.
   95  * This structure defines the on-disk format of a dinode. Since
   96  * this structure describes an on-disk structure, all its fields
   97  * are defined by types with precise widths.
   98  */
   99 
  100 #define NXADDR  2                       /* External addresses in inode. */
  101 #define NDADDR  12                      /* Direct addresses in inode. */
  102 #define NIADDR  3                       /* Indirect addresses in inode. */
  103 
  104 struct ufs2_dinode {
  105         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
  106         int16_t         di_nlink;       /*   2: File link count. */
  107         u_int32_t       di_uid;         /*   4: File owner. */
  108         u_int32_t       di_gid;         /*   8: File group. */
  109         u_int32_t       di_blksize;     /*  12: Inode blocksize. */
  110         u_int64_t       di_size;        /*  16: File byte count. */
  111         u_int64_t       di_blocks;      /*  24: Bytes actually held. */
  112         ufs_time_t      di_atime;       /*  32: Last access time. */
  113         ufs_time_t      di_mtime;       /*  40: Last modified time. */
  114         ufs_time_t      di_ctime;       /*  48: Last inode change time. */
  115         ufs_time_t      di_birthtime;   /*  56: Inode creation time. */
  116         int32_t         di_mtimensec;   /*  64: Last modified time. */
  117         int32_t         di_atimensec;   /*  68: Last access time. */
  118         int32_t         di_ctimensec;   /*  72: Last inode change time. */
  119         int32_t         di_birthnsec;   /*  76: Inode creation time. */
  120         int32_t         di_gen;         /*  80: Generation number. */
  121         u_int32_t       di_kernflags;   /*  84: Kernel flags. */
  122         u_int32_t       di_flags;       /*  88: Status flags (chflags). */
  123         int32_t         di_extsize;     /*  92: External attributes block. */
  124         ufs2_daddr_t    di_extb[NXADDR];/*  96: External attributes block. */
  125         ufs2_daddr_t    di_db[NDADDR];  /* 112: Direct disk blocks. */
  126         ufs2_daddr_t    di_ib[NIADDR];  /* 208: Indirect disk blocks. */
  127         int64_t         di_spare[3];    /* 232: Reserved; currently unused */
  128 };
  129 
  130 /*
  131  * The di_db fields may be overlaid with other information for
  132  * file types that do not have associated disk storage. Block
  133  * and character devices overlay the first data block with their
  134  * dev_t value. Short symbolic links place their path in the
  135  * di_db area.
  136  */
  137 #define di_rdev di_db[0]
  138 
  139 /*
  140  * A UFS1 dinode contains all the meta-data associated with a UFS1 file.
  141  * This structure defines the on-disk format of a UFS1 dinode. Since
  142  * this structure describes an on-disk structure, all its fields
  143  * are defined by types with precise widths.
  144  */
  145 struct ufs1_dinode {
  146         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
  147         int16_t         di_nlink;       /*   2: File link count. */
  148         union {
  149                 u_int16_t oldids[2];    /*   4: Ffs: old user and group ids. */
  150         } di_u;
  151         u_int64_t       di_size;        /*   8: File byte count. */
  152         int32_t         di_atime;       /*  16: Last access time. */
  153         int32_t         di_atimensec;   /*  20: Last access time. */
  154         int32_t         di_mtime;       /*  24: Last modified time. */
  155         int32_t         di_mtimensec;   /*  28: Last modified time. */
  156         int32_t         di_ctime;       /*  32: Last inode change time. */
  157         int32_t         di_ctimensec;   /*  36: Last inode change time. */
  158         ufs1_daddr_t    di_db[NDADDR];  /*  40: Direct disk blocks. */
  159         ufs1_daddr_t    di_ib[NIADDR];  /*  88: Indirect disk blocks. */
  160         u_int32_t       di_flags;       /* 100: Status flags (chflags). */
  161         int32_t         di_blocks;      /* 104: Blocks actually held. */
  162         int32_t         di_gen;         /* 108: Generation number. */
  163         u_int32_t       di_uid;         /* 112: File owner. */
  164         u_int32_t       di_gid;         /* 116: File group. */
  165         int32_t         di_spare[2];    /* 120: Reserved; currently unused */
  166 };
  167 #define di_ogid         di_u.oldids[1]
  168 #define di_ouid         di_u.oldids[0]
  169 
  170 #endif /* _UFS_UFS_DINODE_H_ */

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