bsd/dev/disk_label.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /* Copyright (c) 1991 by NeXT Computer, Inc.
  26  *
  27  *      File:   bsd/dev/disk_label.h - NeXT disk label definition.
  28  *
  29  */
  30
  31 #ifndef _BSD_DEV_DISK_LABEL_
  32 #define _BSD_DEV_DISK_LABEL_
  33
  34 #include <sys/appleapiopts.h>
  35 #include <sys/disktab.h>
  36
  37 #ifdef  __APPLE_API_OBSOLETE
  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  /* __APPLE_API_OBSOLETE */
 110
 111 #endif  /* _BSD_DEV_DISK_LABEL_ */
 112