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