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Annotation of qemu/roms/openbios/fs/grubfs/defs.h, revision 1.1.1.1

1.1       root        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  [email protected]
                     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: typedef struct _quad_
                     46:   {
                     47:     unsigned int val[2];       /* 2 int values make... */
                     48:   }
                     49: quad;                          /* an 8-byte item */
                     50: 
                     51: typedef unsigned int mach_time_t;      /* an unsigned int */
                     52: typedef unsigned int mach_daddr_t;     /* an unsigned int */
                     53: typedef unsigned int mach_off_t;       /* another unsigned int */
                     54: 
                     55: typedef unsigned short mach_uid_t;
                     56: typedef unsigned short mach_gid_t;
                     57: typedef unsigned int mach_ino_t;
                     58: 
                     59: #define        NBBY    8
                     60: 
                     61: /*
                     62:  * The file system is made out of blocks of at most MAXBSIZE units,
                     63:  * with smaller units (fragments) only in the last direct block.
                     64:  * MAXBSIZE primarily determines the size of buffers in the buffer
                     65:  * pool.  It may be made larger without any effect on existing
                     66:  * file systems; however, making it smaller may make some file
                     67:  * systems unmountable.
                     68:  *
                     69:  * Note that the disk devices are assumed to have DEV_BSIZE "sectors"
                     70:  * and that fragments must be some multiple of this size.
                     71:  */
                     72: #define        MAXBSIZE        8192
                     73: #define        MAXFRAG         8
                     74: 
                     75: /*
                     76:  * MAXPATHLEN defines the longest permissible path length
                     77:  * after expanding symbolic links.
                     78:  *
                     79:  * MAXSYMLINKS defines the maximum number of symbolic links
                     80:  * that may be expanded in a path name.  It should be set
                     81:  * high enough to allow all legitimate uses, but halt infinite
                     82:  * loops reasonably quickly.
                     83:  */
                     84: 
                     85: #define        MAXPATHLEN      1024
                     86: #define        MAXSYMLINKS     8

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