bsd/dev/disk_label.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1991 by NeXT Computer, Inc.
  23  *
  24  *      File:   bsd/dev/disk_label.h - NeXT disk label definition.
  25  *
  26  * HISTORY
  27  * 28-Mar-92  Doug Mitchell at NeXT
  28  *      Split out from <bsd/dev/disk.h>.
  29  */
  30
  31 #ifndef _BSD_DEV_DISK_LABEL_
  32 #define _BSD_DEV_DISK_LABEL_
  33
  34 #include <sys/disktab.h>
  35
  36 #define NLABELS         4               /* # of labels on a disk */
  37 #define MAXLBLLEN       24              /* dl_label[] size */
  38 #define NBAD            1670            /* sized to make label ~= 8KB */
  39
  40 /*
  41  *  if dl_version >= DL_V3 then the bad block table is relocated
  42  *  to a structure separate from the disk label.
  43  */
  44 typedef union {
  45         unsigned short  DL_v3_checksum;
  46         int     DL_bad[NBAD];                   /* block number that is bad */
  47 } dl_un_t;
  48
  49 typedef struct disk_label {
  50         int             dl_version;             // label version number
  51         int             dl_label_blkno;         // block # where this label is
  52         int             dl_size;                // size of media area (sectors)
  53         char            dl_label[MAXLBLLEN];    // media label
  54         unsigned        dl_flags;               // flags (see DL_xxx, below)
  55         unsigned        dl_tag;                 // volume tag
  56         struct  disktab dl_dt;                  // common info in disktab
  57         dl_un_t         dl_un;
  58         unsigned short  dl_checksum;            // ones complement checksum
  59
  60         /* add things here so dl_checksum stays in a fixed place */
  61 } disk_label_t;
  62
  63 /*
  64  * Known label versions.
  65  */
  66 #define DL_V1           0x4e655854      /* version #1: "NeXT" */
  67 #define DL_V2           0x646c5632      /* version #2: "dlV2" */
  68 #define DL_V3           0x646c5633      /* version #3: "dlV3" */
  69 #define DL_VERSION      DL_V3           /* default version */
  70
  71
  72 /*
  73  * dl_flags values
  74  */
  75 #define DL_UNINIT       0x80000000      /* label is uninitialized */
  76
  77 /*
  78  * Aliases for disktab fields
  79  */
  80 #define dl_name         dl_dt.d_name
  81 #define dl_type         dl_dt.d_type
  82 #define dl_part         dl_dt.d_partitions
  83 #define dl_front        dl_dt.d_front
  84 #define dl_back         dl_dt.d_back
  85 #define dl_ngroups      dl_dt.d_ngroups
  86 #define dl_ag_size      dl_dt.d_ag_size
  87 #define dl_ag_alts      dl_dt.d_ag_alts
  88 #define dl_ag_off       dl_dt.d_ag_off
  89 #define dl_secsize      dl_dt.d_secsize
  90 #define dl_ncyl         dl_dt.d_ncylinders
  91 #define dl_nsect        dl_dt.d_nsectors
  92 #define dl_ntrack       dl_dt.d_ntracks
  93 #define dl_rpm          dl_dt.d_rpm
  94 #define dl_bootfile     dl_dt.d_bootfile
  95 #define dl_boot0_blkno  dl_dt.d_boot0_blkno
  96 #define dl_hostname     dl_dt.d_hostname
  97 #define dl_rootpartition dl_dt.d_rootpartition
  98 #define dl_rwpartition  dl_dt.d_rwpartition
  99
 100 /*
 101  * Other aliases
 102  */
 103 #define dl_v3_checksum  dl_un.DL_v3_checksum
 104 #define dl_bad          dl_un.DL_bad
 105
 106 #endif  /* _BSD_DEV_DISK_LABEL_ */
 107