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  * SPDX-License-Identifier: (BSD-2-Clause-FreeBSD AND BSD-3-Clause)
    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  * 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  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * Copyright (c) 1982, 1989, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  * (c) UNIX System Laboratories, Inc.
   37  * All or some portions of this file are derived from material licensed
   38  * to the University of California by American Telephone and Telegraph
   39  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   40  * the permission of UNIX System Laboratories, Inc.
   41  *
   42  * Redistribution and use in source and binary forms, with or without
   43  * modification, are permitted provided that the following conditions
   44  * are met:
   45  * 1. Redistributions of source code must retain the above copyright
   46  *    notice, this list of conditions and the following disclaimer.
   47  * 2. Redistributions in binary form must reproduce the above copyright
   48  *    notice, this list of conditions and the following disclaimer in the
   49  *    documentation and/or other materials provided with the distribution.
   50  * 3. The names of the authors may not be used to endorse or promote
   51  *    products derived from this software without specific prior written
   52  *    permission.
   53  *
   54  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   64  * SUCH DAMAGE.
   65  *
   66  *      @(#)dinode.h    8.3 (Berkeley) 1/21/94
   67  * $FreeBSD: stable/12/sys/ufs/ufs/dinode.h 331095 2018-03-17 12:59:55Z emaste $
   68  */
   69 
   70 #ifndef _UFS_UFS_DINODE_H_
   71 #define _UFS_UFS_DINODE_H_
   72 
   73 /*
   74  * The root inode is the root of the filesystem.  Inode 0 can't be used for
   75  * normal purposes and historically bad blocks were linked to inode 1, thus
   76  * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
   77  * numerous dump tapes make this assumption, so we are stuck with it).
   78  */
   79 #define UFS_ROOTINO     ((ino_t)2)
   80 
   81 /*
   82  * The Whiteout inode# is a dummy non-zero inode number which will
   83  * never be allocated to a real file.  It is used as a place holder
   84  * in the directory entry which has been tagged as a DT_WHT entry.
   85  * See the comments about UFS_ROOTINO above.
   86  */
   87 #define UFS_WINO        ((ino_t)1)
   88 
   89 /*
   90  * The size of physical and logical block numbers and time fields in UFS.
   91  */
   92 typedef int32_t ufs1_daddr_t;
   93 typedef int64_t ufs2_daddr_t;
   94 typedef int64_t ufs_lbn_t;
   95 typedef int64_t ufs_time_t;
   96 
   97 /* File permissions. */
   98 #define IEXEC           0000100         /* Executable. */
   99 #define IWRITE          0000200         /* Writeable. */
  100 #define IREAD           0000400         /* Readable. */
  101 #define ISVTX           0001000         /* Sticky bit. */
  102 #define ISGID           0002000         /* Set-gid. */
  103 #define ISUID           0004000         /* Set-uid. */
  104 
  105 /* File types. */
  106 #define IFMT            0170000         /* Mask of file type. */
  107 #define IFIFO           0010000         /* Named pipe (fifo). */
  108 #define IFCHR           0020000         /* Character device. */
  109 #define IFDIR           0040000         /* Directory file. */
  110 #define IFBLK           0060000         /* Block device. */
  111 #define IFREG           0100000         /* Regular file. */
  112 #define IFLNK           0120000         /* Symbolic link. */
  113 #define IFSOCK          0140000         /* UNIX domain socket. */
  114 #define IFWHT           0160000         /* Whiteout. */
  115 
  116 /*
  117  * A dinode contains all the meta-data associated with a UFS2 file.
  118  * This structure defines the on-disk format of a dinode. Since
  119  * this structure describes an on-disk structure, all its fields
  120  * are defined by types with precise widths.
  121  */
  122 
  123 #define UFS_NXADDR      2               /* External addresses in inode. */
  124 #define UFS_NDADDR      12              /* Direct addresses in inode. */
  125 #define UFS_NIADDR      3               /* Indirect addresses in inode. */
  126 
  127 struct ufs2_dinode {
  128         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
  129         int16_t         di_nlink;       /*   2: File link count. */
  130         u_int32_t       di_uid;         /*   4: File owner. */
  131         u_int32_t       di_gid;         /*   8: File group. */
  132         u_int32_t       di_blksize;     /*  12: Inode blocksize. */
  133         u_int64_t       di_size;        /*  16: File byte count. */
  134         u_int64_t       di_blocks;      /*  24: Blocks actually held. */
  135         ufs_time_t      di_atime;       /*  32: Last access time. */
  136         ufs_time_t      di_mtime;       /*  40: Last modified time. */
  137         ufs_time_t      di_ctime;       /*  48: Last inode change time. */
  138         ufs_time_t      di_birthtime;   /*  56: Inode creation time. */
  139         int32_t         di_mtimensec;   /*  64: Last modified time. */
  140         int32_t         di_atimensec;   /*  68: Last access time. */
  141         int32_t         di_ctimensec;   /*  72: Last inode change time. */
  142         int32_t         di_birthnsec;   /*  76: Inode creation time. */
  143         u_int32_t       di_gen;         /*  80: Generation number. */
  144         u_int32_t       di_kernflags;   /*  84: Kernel flags. */
  145         u_int32_t       di_flags;       /*  88: Status flags (chflags). */
  146         u_int32_t       di_extsize;     /*  92: External attributes size. */
  147         ufs2_daddr_t    di_extb[UFS_NXADDR];/* 96: External attributes block. */
  148         ufs2_daddr_t    di_db[UFS_NDADDR]; /* 112: Direct disk blocks. */
  149         ufs2_daddr_t    di_ib[UFS_NIADDR]; /* 208: Indirect disk blocks. */
  150         u_int64_t       di_modrev;      /* 232: i_modrev for NFSv4 */
  151         uint32_t        di_freelink;    /* 240: SUJ: Next unlinked inode. */
  152         uint32_t        di_spare[3];    /* 244: Reserved; currently unused */
  153 };
  154 
  155 /*
  156  * The di_db fields may be overlaid with other information for
  157  * file types that do not have associated disk storage. Block
  158  * and character devices overlay the first data block with their
  159  * dev_t value. Short symbolic links place their path in the
  160  * di_db area.
  161  */
  162 #define di_rdev di_db[0]
  163 
  164 /*
  165  * A UFS1 dinode contains all the meta-data associated with a UFS1 file.
  166  * This structure defines the on-disk format of a UFS1 dinode. Since
  167  * this structure describes an on-disk structure, all its fields
  168  * are defined by types with precise widths.
  169  */
  170 struct ufs1_dinode {
  171         u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
  172         int16_t         di_nlink;       /*   2: File link count. */
  173         uint32_t        di_freelink;    /*   4: SUJ: Next unlinked inode. */
  174         u_int64_t       di_size;        /*   8: File byte count. */
  175         int32_t         di_atime;       /*  16: Last access time. */
  176         int32_t         di_atimensec;   /*  20: Last access time. */
  177         int32_t         di_mtime;       /*  24: Last modified time. */
  178         int32_t         di_mtimensec;   /*  28: Last modified time. */
  179         int32_t         di_ctime;       /*  32: Last inode change time. */
  180         int32_t         di_ctimensec;   /*  36: Last inode change time. */
  181         ufs1_daddr_t    di_db[UFS_NDADDR]; /*  40: Direct disk blocks. */
  182         ufs1_daddr_t    di_ib[UFS_NIADDR]; /*  88: Indirect disk blocks. */
  183         u_int32_t       di_flags;       /* 100: Status flags (chflags). */
  184         u_int32_t       di_blocks;      /* 104: Blocks actually held. */
  185         u_int32_t       di_gen;         /* 108: Generation number. */
  186         u_int32_t       di_uid;         /* 112: File owner. */
  187         u_int32_t       di_gid;         /* 116: File group. */
  188         u_int64_t       di_modrev;      /* 120: i_modrev for NFSv4 */
  189 };
  190 
  191 #define UFS_LINK_MAX    32767
  192 
  193 #endif /* _UFS_UFS_DINODE_H_ */

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