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

     /*-
      * SPDX-License-Identifier: (BSD-2-Clause-FreeBSD AND BSD-3-Clause)
      *
      * Copyright (c) 2002 Networks Associates Technology, Inc.
      * All rights reserved.
      *
      * This software was developed for the FreeBSD Project by Marshall
      * Kirk McKusick and Network Associates Laboratories, the Security
      * Research Division of Network Associates, Inc. under DARPA/SPAWAR
     * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
     * research program
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * Copyright (c) 1982, 1989, 1993
     *      The Regents of the University of California.  All rights reserved.
     * (c) UNIX System Laboratories, Inc.
     * All or some portions of this file are derived from material licensed
     * to the University of California by American Telephone and Telegraph
     * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The names of the authors may not be used to endorse or promote
     *    products derived from this software without specific prior written
     *    permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)dinode.h    8.3 (Berkeley) 1/21/94
     * $FreeBSD$
     */
    
    #ifndef _UFS_UFS_DINODE_H_
    #define _UFS_UFS_DINODE_H_
    
    /*
     * The root inode is the root of the filesystem.  Inode 0 can't be used for
     * normal purposes and historically bad blocks were linked to inode 1, thus
     * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
     * numerous dump tapes make this assumption, so we are stuck with it).
     */
    #define UFS_ROOTINO     ((ino_t)2)
    
    /*
     * The Whiteout inode# is a dummy non-zero inode number which will
     * never be allocated to a real file.  It is used as a place holder
     * in the directory entry which has been tagged as a DT_WHT entry.
     * See the comments about UFS_ROOTINO above.
     */
    #define UFS_WINO        ((ino_t)1)
    
    /*
     * The size of physical and logical block numbers and time fields in UFS.
     */
    typedef int32_t ufs1_daddr_t;
    typedef int64_t ufs2_daddr_t;
    typedef int64_t ufs_lbn_t;
    typedef int64_t ufs_time_t;
    
    /* File permissions. */
    #define IEXEC           0000100         /* Executable. */
    #define IWRITE          0000200         /* Writeable. */
   #define IREAD           0000400         /* Readable. */
   #define ISVTX           0001000         /* Sticky bit. */
   #define ISGID           0002000         /* Set-gid. */
   #define ISUID           0004000         /* Set-uid. */
   
   /* File types. */
   #define IFMT            0170000         /* Mask of file type. */
   #define IFIFO           0010000         /* Named pipe (fifo). */
   #define IFCHR           0020000         /* Character device. */
   #define IFDIR           0040000         /* Directory file. */
   #define IFBLK           0060000         /* Block device. */
   #define IFREG           0100000         /* Regular file. */
   #define IFLNK           0120000         /* Symbolic link. */
   #define IFSOCK          0140000         /* UNIX domain socket. */
   #define IFWHT           0160000         /* Whiteout. */
   
   /*
    * A dinode contains all the meta-data associated with a UFS2 file.
    * This structure defines the on-disk format of a dinode. Since
    * this structure describes an on-disk structure, all its fields
    * are defined by types with precise widths.
    */
   
   #define UFS_NXADDR      2               /* External addresses in inode. */
   #define UFS_NDADDR      12              /* Direct addresses in inode. */
   #define UFS_NIADDR      3               /* Indirect addresses in inode. */
   
   struct ufs2_dinode {
           u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
           int16_t         di_nlink;       /*   2: File link count. */
           u_int32_t       di_uid;         /*   4: File owner. */
           u_int32_t       di_gid;         /*   8: File group. */
           u_int32_t       di_blksize;     /*  12: Inode blocksize. */
           u_int64_t       di_size;        /*  16: File byte count. */
           u_int64_t       di_blocks;      /*  24: Blocks actually held. */
           ufs_time_t      di_atime;       /*  32: Last access time. */
           ufs_time_t      di_mtime;       /*  40: Last modified time. */
           ufs_time_t      di_ctime;       /*  48: Last inode change time. */
           ufs_time_t      di_birthtime;   /*  56: Inode creation time. */
           int32_t         di_mtimensec;   /*  64: Last modified time. */
           int32_t         di_atimensec;   /*  68: Last access time. */
           int32_t         di_ctimensec;   /*  72: Last inode change time. */
           int32_t         di_birthnsec;   /*  76: Inode creation time. */
           u_int32_t       di_gen;         /*  80: Generation number. */
           u_int32_t       di_kernflags;   /*  84: Kernel flags. */
           u_int32_t       di_flags;       /*  88: Status flags (chflags). */
           u_int32_t       di_extsize;     /*  92: External attributes size. */
           ufs2_daddr_t    di_extb[UFS_NXADDR];/* 96: External attributes block. */
           union {
                   struct {
                           ufs2_daddr_t    di_db /* 112: Direct disk blocks. */
                               [UFS_NDADDR];
                           ufs2_daddr_t    di_ib /* 208: Indirect disk blocks. */
                               [UFS_NIADDR];
                   };
                   char    di_shortlink    /* 112: Embedded symbolic link. */
                       [(UFS_NDADDR + UFS_NIADDR) * sizeof(ufs2_daddr_t)];
           };
           u_int64_t       di_modrev;      /* 232: i_modrev for NFSv4 */
           uint32_t        di_freelink;    /* 240: SUJ: Next unlinked inode. */
           uint32_t        di_ckhash;      /* 244: if CK_INODE, its check-hash */
           uint32_t        di_spare[2];    /* 248: Reserved; currently unused */
   };
   
   /*
    * The di_db fields may be overlaid with other information for
    * file types that do not have associated disk storage. Block
    * and character devices overlay the first data block with their
    * dev_t value. Short symbolic links place their path in the
    * di_db area.
    */
   #define di_rdev di_db[0]
   
   /*
    * A UFS1 dinode contains all the meta-data associated with a UFS1 file.
    * This structure defines the on-disk format of a UFS1 dinode. Since
    * this structure describes an on-disk structure, all its fields
    * are defined by types with precise widths.
    */
   struct ufs1_dinode {
           u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
           int16_t         di_nlink;       /*   2: File link count. */
           uint32_t        di_freelink;    /*   4: SUJ: Next unlinked inode. */
           u_int64_t       di_size;        /*   8: File byte count. */
           int32_t         di_atime;       /*  16: Last access time. */
           int32_t         di_atimensec;   /*  20: Last access time. */
           int32_t         di_mtime;       /*  24: Last modified time. */
           int32_t         di_mtimensec;   /*  28: Last modified time. */
           int32_t         di_ctime;       /*  32: Last inode change time. */
           int32_t         di_ctimensec;   /*  36: Last inode change time. */
           union {
                   struct {
                           ufs1_daddr_t    di_db /*  40: Direct disk blocks. */
                               [UFS_NDADDR];
                           ufs1_daddr_t    di_ib /*  88: Indirect disk blocks. */
                               [UFS_NIADDR];
                   };
                   char    di_shortlink    /*  40: Embedded symbolic link. */
                       [(UFS_NDADDR + UFS_NIADDR) * sizeof(ufs1_daddr_t)];
           };
           u_int32_t       di_flags;       /* 100: Status flags (chflags). */
           u_int32_t       di_blocks;      /* 104: Blocks actually held. */
           u_int32_t       di_gen;         /* 108: Generation number. */
           u_int32_t       di_uid;         /* 112: File owner. */
           u_int32_t       di_gid;         /* 116: File group. */
           u_int64_t       di_modrev;      /* 120: i_modrev for NFSv4 */
   };
   
   #define UFS_LINK_MAX    32767
   
   #endif /* _UFS_UFS_DINODE_H_ */

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