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dinode.h

/*    $NetBSD: dinode.h,v 1.19 2005/12/11 12:25:28 christos Exp $ */

/*
 * 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
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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      8.9 (Berkeley) 3/29/95
 */

#ifndef     _UFS_UFS_DINODE_H_
#define     _UFS_UFS_DINODE_H_

/*
 * The root inode is the root of the file system.  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     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_W entry.
 * See the comments about ROOTINO above.
 */
#define     WINO  ((ino_t)1)

/*
 * A dinode contains all the meta-data associated with a UFS 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 NXADDR    2
#define     NDADDR      12                /* Direct addresses in inode. */
#define     NIADDR      3                 /* Indirect addresses in inode. */

struct ufs1_dinode {
      u_int16_t   di_mode;    /*   0: IFMT, permissions; see below. */
      int16_t           di_nlink;   /*   2: File link count. */
      union {
            u_int16_t oldids[2];    /*   4: Ffs: old user and group ids. */
            u_int32_t inumber;      /*   4: Lfs: inode number. */
      } di_u;
      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. */
      int32_t           di_db[NDADDR];    /*  40: Direct disk blocks. */
      int32_t           di_ib[NIADDR];    /*  88: Indirect disk blocks. */
      u_int32_t   di_flags;   /* 100: Status flags (chflags). */
      u_int32_t   di_blocks;  /* 104: Blocks actually held. */
      int32_t           di_gen;           /* 108: Generation number. */
      u_int32_t   di_uid;           /* 112: File owner. */
      u_int32_t   di_gid;           /* 116: File group. */
      int32_t           di_spare[2];      /* 120: Reserved; currently unused */
};

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: Bytes actually held. */
      int64_t           di_atime;   /*  32: Last access time. */
      int64_t           di_mtime;   /*  40: Last modified time. */
      int64_t           di_ctime;   /*  48: Last inode change time. */
      int64_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. */
      int32_t           di_gen;           /*  80: Generation number. */
      u_int32_t   di_kernflags;     /*  84: Kernel flags. */
      u_int32_t   di_flags;   /*  88: Status flags (chflags). */
      int32_t           di_extsize; /*  92: External attributes block. */
      int64_t           di_extb[NXADDR];/*  96: External attributes block. */
      int64_t           di_db[NDADDR];    /* 112: Direct disk blocks. */
      int64_t           di_ib[NIADDR];    /* 208: Indirect disk blocks. */
      int64_t           di_spare[3];      /* 232: 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_inumber  di_u.inumber
#define     di_ogid           di_u.oldids[1]
#define     di_ouid           di_u.oldids[0]
#define     di_rdev           di_db[0]
#define MAXSYMLINKLEN_UFS1    ((NDADDR + NIADDR) * sizeof(int32_t))
#define MAXSYMLINKLEN_UFS2    ((NDADDR + NIADDR) * sizeof(int64_t))

#define MAXSYMLINKLEN(ip) \
      ((ip)->i_ump->um_fstype == UFS1) ? \
      MAXSYMLINKLEN_UFS1 : MAXSYMLINKLEN_UFS2

/* NeXT used to keep short symlinks in the inode even when using
 * FS_42INODEFMT.  In that case fs->fs_maxsymlinklen is probably -1,
 * but short symlinks were stored in inodes shorter than this:
 */
#define     APPLEUFS_MAXSYMLINKLEN 60

/* File permissions. */
#define     IEXEC       0000100           /* Executable. */
#define     IWRITE            0000200           /* Writable. */
#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. */

/* Size of the on-disk inode. */
#define     DINODE1_SIZE      (sizeof(struct ufs1_dinode))        /* 128 */
#define     DINODE2_SIZE      (sizeof(struct ufs2_dinode))

#endif /* !_UFS_UFS_DINODE_H_ */

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