openblt

a hobby OS from the late 90s
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dinode.h (5590B)


      1 /* $Id: //depot/blt/srv/vfs/drivers/ffs/dinode.h#2 $ */
      2 /* OpenBSD: dinode.h,v 1.3 1997/02/24 14:27:16 niklas Exp */
      3 /* NetBSD: dinode.h,v 1.7 1995/06/15 23:22:48 cgd Exp */
      4 
      5 /*
      6  * Copyright (c) 1982, 1989, 1993
      7  *     The Regents of the University of California.  All rights reserved.
      8  * (c) UNIX System Laboratories, Inc.
      9  * All or some portions of this file are derived from material licensed
     10  * to the University of California by American Telephone and Telegraph
     11  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     12  * the permission of UNIX System Laboratories, Inc.
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  * 1. Redistributions of source code must retain the above copyright
     18  *    notice, this list of conditions and the following disclaimer.
     19  * 2. Redistributions in binary form must reproduce the above copyright
     20  *    notice, this list of conditions and the following disclaimer in the
     21  *    documentation and/or other materials provided with the distribution.
     22  * 3. All advertising materials mentioning features or use of this software
     23  *    must display the following acknowledgement:
     24  *        This product includes software developed by the University of
     25  *        California, Berkeley and its contributors.
     26  * 4. Neither the name of the University nor the names of its contributors
     27  *    may be used to endorse or promote products derived from this software
     28  *    without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40  * SUCH DAMAGE.
     41  *
     42  * @(#)dinode.h 8.6 (Berkeley) 9/13/94
     43  */
     44 
     45 #ifndef DINODE_H
     46 #define DINODE_H
     47 
     48 /*
     49  * The root inode is the root of the file system.  Inode 0 can't be used for
     50  * normal purposes and historically bad blocks were linked to inode 1, thus
     51  * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
     52  * numerous dump tapes make this assumption, so we are stuck with it).
     53  */
     54 #define	ROOTINO	((ino_t)2)
     55 
     56 /*
     57  * The Whiteout inode# is a dummy non-zero inode number which will
     58  * never be allocated to a real file.  It is used as a place holder
     59  * in the directory entry which has been tagged as a DT_W entry.
     60  * See the comments about ROOTINO above.
     61  */
     62 #define	WINO	((ino_t)1)
     63 
     64 /*
     65  * A dinode contains all the meta-data associated with a UFS file.
     66  * This structure defines the on-disk format of a dinode. Since
     67  * this structure describes an on-disk structure, all its fields
     68  * are defined by types with precise widths.
     69  */
     70 
     71 #define	NDADDR	12			/* Direct addresses in inode. */
     72 #define	NIADDR	3			/* Indirect addresses in inode. */
     73 
     74 struct ffs_dinode {
     75 	uint16		di_mode;	/*   0: IFMT, permissions; see below. */
     76 	int16		di_nlink;	/*   2: File link count. */
     77 	union {
     78 		uint16 	oldids[2];	/*   4: Ffs: old user and group ids. */
     79 		ino_t	  inumber;	/*   4: Lfs: inode number. */
     80 	} di_u;
     81 	uint64		di_size;	/*   8: File byte count. */
     82 	int32		di_atime;	/*  16: Last access time. */
     83 	int32		di_atimensec;	/*  20: Last access time. */
     84 	int32		di_mtime;	/*  24: Last modified time. */
     85 	int32		di_mtimensec;	/*  28: Last modified time. */
     86 	int32		di_ctime;	/*  32: Last inode change time. */
     87 	int32		di_ctimensec;	/*  36: Last inode change time. */
     88 	int32		di_db[NDADDR];	/*  40: Direct disk blocks. */
     89 	int32		di_ib[NIADDR];	/*  88: Indirect disk blocks. */
     90 	uint32		di_flags;	/* 100: Status flags (chflags). */
     91 	int32		di_blocks;	/* 104: Blocks actually held. */
     92 	int32		di_gen;		/* 108: Generation number. */
     93 	uint32		di_uid;		/* 112: File owner. */
     94 	uint32		di_gid;		/* 116: File group. */
     95 	int32		di_spare[2];	/* 120: Reserved; currently unused */
     96 };
     97 
     98 /*
     99  * The di_db fields may be overlaid with other information for
    100  * file types that do not have associated disk storage. Block
    101  * and character devices overlay the first data block with their
    102  * dev_t value. Short symbolic links place their path in the
    103  * di_db area.
    104  */
    105 #define	di_inumber	di_u.inumber
    106 #define	di_ogid		di_u.oldids[1]
    107 #define	di_ouid		di_u.oldids[0]
    108 #define	di_rdev		di_db[0]
    109 #define	di_shortlink	di_db
    110 #define	MAXSYMLINKLEN	((NDADDR + NIADDR) * sizeof(uint32))
    111 
    112 /* File permissions. */
    113 #define	IEXEC		0000100		/* Executable. */
    114 #define	IWRITE		0000200		/* Writeable. */
    115 #define	IREAD		0000400		/* Readable. */
    116 #define	ISVTX		0001000		/* Sticky bit. */
    117 #define	ISGID		0002000		/* Set-gid. */
    118 #define	ISUID		0004000		/* Set-uid. */
    119 
    120 /* File types. */
    121 #define	IFMT		0170000		/* Mask of file type. */
    122 #define	IFIFO		0010000		/* Named pipe (fifo). */
    123 #define	IFCHR		0020000		/* Character device. */
    124 #define	IFDIR		0040000		/* Directory file. */
    125 #define	IFBLK		0060000		/* Block device. */
    126 #define	IFREG		0100000		/* Regular file. */
    127 #define	IFLNK		0120000		/* Symbolic link. */
    128 #define	IFSOCK		0140000		/* UNIX domain socket. */
    129 #define	IFWHT		0160000		/* Whiteout. */
    130 
    131 #endif
    132