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Annotation of kernel/bsd/dev/disk_label.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1991 by NeXT Computer, Inc.
        !            26:  *
        !            27:  *     File:   bsd/dev/disk_label.h - NeXT disk label definition.
        !            28:  *
        !            29:  * HISTORY
        !            30:  * 28-Mar-92  Doug Mitchell at NeXT
        !            31:  *     Split out from <bsd/dev/disk.h>.
        !            32:  */
        !            33: 
        !            34: #ifndef        _BSD_DEV_DISK_LABEL_
        !            35: #define        _BSD_DEV_DISK_LABEL_
        !            36: 
        !            37: #import <bsd/sys/disktab.h>
        !            38: 
        !            39: #define        NLABELS         4               /* # of labels on a disk */
        !            40: #define        MAXLBLLEN       24              /* dl_label[] size */
        !            41: #define        NBAD            1670            /* sized to make label ~= 8KB */
        !            42: 
        !            43: /*
        !            44:  *  if dl_version >= DL_V3 then the bad block table is relocated
        !            45:  *  to a structure separate from the disk label.
        !            46:  */
        !            47: typedef union {
        !            48:        unsigned short  DL_v3_checksum;
        !            49:        int     DL_bad[NBAD];                   /* block number that is bad */
        !            50: } dl_un_t;
        !            51: 
        !            52: typedef struct disk_label {
        !            53:        int             dl_version;             // label version number
        !            54:        int             dl_label_blkno;         // block # where this label is
        !            55:        int             dl_size;                // size of media area (sectors)
        !            56:        char            dl_label[MAXLBLLEN];    // media label
        !            57:        unsigned        dl_flags;               // flags (see DL_xxx, below)
        !            58:        unsigned        dl_tag;                 // volume tag
        !            59:        struct  disktab dl_dt;                  // common info in disktab
        !            60:        dl_un_t         dl_un;
        !            61:        unsigned short  dl_checksum;            // ones complement checksum
        !            62:        
        !            63:        /* add things here so dl_checksum stays in a fixed place */
        !            64: } disk_label_t;
        !            65: 
        !            66: /*
        !            67:  * Known label versions.
        !            68:  */
        !            69: #define        DL_V1           0x4e655854      /* version #1: "NeXT" */
        !            70: #define        DL_V2           0x646c5632      /* version #2: "dlV2" */
        !            71: #define        DL_V3           0x646c5633      /* version #3: "dlV3" */
        !            72: #define        DL_VERSION      DL_V3           /* default version */
        !            73: 
        !            74: 
        !            75: /*
        !            76:  * dl_flags values
        !            77:  */
        !            78: #define        DL_UNINIT       0x80000000      /* label is uninitialized */
        !            79: 
        !            80: /*
        !            81:  * Aliases for disktab fields
        !            82:  */
        !            83: #define        dl_name         dl_dt.d_name
        !            84: #define        dl_type         dl_dt.d_type
        !            85: #define dl_part                dl_dt.d_partitions
        !            86: #define        dl_front        dl_dt.d_front
        !            87: #define        dl_back         dl_dt.d_back
        !            88: #define        dl_ngroups      dl_dt.d_ngroups
        !            89: #define        dl_ag_size      dl_dt.d_ag_size
        !            90: #define        dl_ag_alts      dl_dt.d_ag_alts
        !            91: #define        dl_ag_off       dl_dt.d_ag_off
        !            92: #define        dl_secsize      dl_dt.d_secsize
        !            93: #define        dl_ncyl         dl_dt.d_ncylinders
        !            94: #define        dl_nsect        dl_dt.d_nsectors
        !            95: #define        dl_ntrack       dl_dt.d_ntracks
        !            96: #define        dl_rpm          dl_dt.d_rpm
        !            97: #define        dl_bootfile     dl_dt.d_bootfile
        !            98: #define        dl_boot0_blkno  dl_dt.d_boot0_blkno
        !            99: #define        dl_hostname     dl_dt.d_hostname
        !           100: #define        dl_rootpartition dl_dt.d_rootpartition
        !           101: #define        dl_rwpartition  dl_dt.d_rwpartition
        !           102: 
        !           103: /*
        !           104:  * Other aliases
        !           105:  */
        !           106: #define        dl_v3_checksum  dl_un.DL_v3_checksum
        !           107: #define        dl_bad          dl_un.DL_bad
        !           108: 
        !           109: #endif /* _BSD_DEV_DISK_LABEL_ */
        !           110: 

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