usr/src/grub/grub-0.97/stage2/defs.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  * Common definitions for Berkeley Fast File System.
  28  */
  29
  30 /*
  31  * Compatibility definitions for disk IO.
  32  */
  33
  34 /*
  35  * Disk devices do all IO in 512-byte blocks.
  36  */
  37 #define DEV_BSIZE       512
  38
  39 /*
  40  * Conversion between bytes and disk blocks.
  41  */
  42 #define btodb(byte_offset)      ((byte_offset) >> 9)
  43 #define dbtob(block_number)     ((block_number) << 9)
  44
  45 /*
  46  * Compatibility definitions for old type names.
  47  */
  48
  49 typedef unsigned char u_char;   /* unsigned char */
  50 typedef unsigned short u_short; /* unsigned short */
  51 typedef unsigned int u_int;     /* unsigned int */
  52
  53 #if !defined(__sun) || !defined(GRUB_UTIL)
  54 typedef struct _quad_
  55   {
  56     unsigned int val[2];        /* 2 int values make... */
  57   }
  58 quad;                           /* an 8-byte item */
  59 #endif /* !__sun || !GRUB_UTIL */
  60
  61 typedef unsigned int mach_time_t;       /* an unsigned int */
  62 typedef unsigned int mach_daddr_t;      /* an unsigned int */
  63 typedef unsigned int mach_off_t;        /* another unsigned int */
  64
  65 typedef unsigned short mach_uid_t;
  66 typedef unsigned short mach_gid_t;
  67 typedef unsigned int mach_ino_t;
  68
  69 #ifndef NBBY
  70 #define NBBY    8
  71 #endif
  72
  73 /*
  74  * The file system is made out of blocks of at most MAXBSIZE units,
  75  * with smaller units (fragments) only in the last direct block.
  76  * MAXBSIZE primarily determines the size of buffers in the buffer
  77  * pool.  It may be made larger without any effect on existing
  78  * file systems; however, making it smaller may make some file
  79  * systems unmountable.
  80  *
  81  * Note that the disk devices are assumed to have DEV_BSIZE "sectors"
  82  * and that fragments must be some multiple of this size.
  83  */
  84 #define MAXBSIZE        8192
  85 #define MAXFRAG         8
  86
  87 /*
  88  * MAXPATHLEN defines the longest permissible path length
  89  * after expanding symbolic links.
  90  *
  91  * MAXSYMLINKS defines the maximum number of symbolic links
  92  * that may be expanded in a path name.  It should be set
  93  * high enough to allow all legitimate uses, but halt infinite
  94  * loops reasonably quickly.
  95  */
  96
  97 #define MAXPATHLEN      1024
  98 #define MAXSYMLINKS     8