fs/grubfs/disk_inode.h

   1 /*
   2  * Mach Operating System
   3  * Copyright (c) 1991,1990 Carnegie Mellon University
   4  * All Rights Reserved.
   5  *
   6  * Permission to use, copy, modify and distribute this software and its
   7  * documentation is hereby granted, provided that both the copyright
   8  * notice and this permission notice appear in all copies of the
   9  * software, derivative works or modified versions, and any portions
  10  * thereof, and that both notices appear in supporting documentation.
  11  *
  12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  15  *
  16  * Carnegie Mellon requests users of this software to return to
  17  *
  18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  19  *  School of Computer Science
  20  *  Carnegie Mellon University
  21  *  Pittsburgh PA 15213-3890
  22  *
  23  * any improvements or extensions that they make and grant Carnegie Mellon
  24  * the rights to redistribute these changes.
  25  */
  26 /*
  27  * Copyright (c) 1982, 1989 The Regents of the University of California.
  28  * All rights reserved.
  29  *
  30  * Redistribution and use in source and binary forms are permitted
  31  * provided that the above copyright notice and this paragraph are
  32  * duplicated in all such forms and that any documentation,
  33  * advertising materials, and other materials related to such
  34  * distribution and use acknowledge that the software was developed
  35  * by the University of California, Berkeley.  The name of the
  36  * University may not be used to endorse or promote products derived
  37  * from this software without specific prior written permission.
  38  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  39  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  40  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  41  *
  42  *      @(#)inode.h     7.5 (Berkeley) 7/3/89
  43  */
  44
  45 #ifndef _BOOT_UFS_DISK_INODE_H_
  46 #define _BOOT_UFS_DISK_INODE_H_
  47
  48 /*
  49  * The I node is the focus of all file activity in the BSD Fast File System.
  50  * There is a unique inode allocated for each active file,
  51  * each current directory, each mounted-on file, text file, and the root.
  52  * An inode is 'named' by its dev/inumber pair. (iget/iget.c)
  53  * Data in icommon is read in from permanent inode on volume.
  54  */
  55
  56 #define FFS_NDADDR      12      /* direct addresses in inode */
  57 #define FFS_NIADDR      3       /* indirect addresses in inode */
  58
  59 #define FFS_MAX_FASTLINK_SIZE   ((FFS_NDADDR + FFS_NIADDR) \
  60                                  * sizeof (mach_daddr_t))
  61
  62 struct icommon
  63   {
  64     unsigned short ic_mode;     /*  0: mode and type of file */
  65     short ic_nlink;             /*  2: number of links to file */
  66     mach_uid_t ic_uid;          /*  4: owner's user id */
  67     mach_gid_t ic_gid;          /*  6: owner's group id */
  68     quad ic_size;               /*  8: number of bytes in file */
  69     mach_time_t ic_atime;       /* 16: time last accessed */
  70     int ic_atspare;
  71     mach_time_t ic_mtime;       /* 24: time last modified */
  72     int ic_mtspare;
  73     mach_time_t ic_ctime;       /* 32: last time inode changed */
  74     int ic_ctspare;
  75     union
  76       {
  77         struct
  78           {
  79             mach_daddr_t Mb_db[FFS_NDADDR];     /* 40: disk block addresses */
  80             mach_daddr_t Mb_ib[FFS_NIADDR];     /* 88: indirect blocks */
  81           }
  82         ic_Mb;
  83         char ic_Msymlink[FFS_MAX_FASTLINK_SIZE];
  84         /* 40: symbolic link name */
  85       }
  86     ic_Mun;
  87 #define ic_db           ic_Mun.ic_Mb.Mb_db
  88 #define ic_ib           ic_Mun.ic_Mb.Mb_ib
  89 #define ic_symlink      ic_Mun.ic_Msymlink
  90     int ic_flags;               /* 100: status, currently unused */
  91     int ic_blocks;              /* 104: blocks actually held */
  92     int ic_gen;                 /* 108: generation number */
  93     int ic_spare[4];            /* 112: reserved, currently unused */
  94   };
  95
  96 /*
  97  *      Same structure, but on disk.
  98  */
  99 struct dinode
 100   {
 101     union
 102       {
 103         struct icommon di_com;
 104         char di_char[128];
 105       }
 106     di_un;
 107   };
 108 #define di_ic   di_un.di_com
 109
 110 #endif /* _BOOT_UFS_DISK_INODE_H_ */