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Annotation of kernel/bsd/dev/disk_label.h, revision 1.1.1.1

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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