usr/src/uts/common/sys/dkbad.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1991,1997-1998 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #ifndef _SYS_DKBAD_H
  28 #define _SYS_DKBAD_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* UCB 4.3 81/05/10 */
  31
  32 #ifdef  __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 /*
  37  * Definitions needed to perform bad sector
  38  * revectoring ala DEC STD 144.
  39  *
  40  * The bad sector information is located in the
  41  * first 5 even numbered sectors of the last
  42  * track of the disk pack.  There are five
  43  * identical copies of the information, described
  44  * by the dkbad structure.
  45  *
  46  * Replacement sectors are allocated starting with
  47  * the first sector before the bad sector information
  48  * and working backwards towards the beginning of
  49  * the disk.  A maximum of 126 bad sectors are supported.
  50  * The position of the bad sector in the bad sector table
  51  * determines which replacement sector it corresponds to.
  52  *
  53  * The bad sector information and replacement sectors
  54  * are conventionally only accessible through the
  55  * 'c' file system partition of the disk.  If that
  56  * partition is used for a file system, the user is
  57  * responsible for making sure that it does not overlap
  58  * the bad sector information or any replacement sector.s
  59  */
  60
  61 #define NDKBAD          126             /* # of entries maximum */
  62
  63 struct dkbad {
  64         long    bt_csn;                 /* cartridge serial number */
  65         ushort_t bt_mbz;                /* unused; should be 0 */
  66         ushort_t bt_flag;               /* -1 => alignment cartridge */
  67         struct bt_bad {
  68                 short   bt_cyl;         /* cylinder number of bad sector */
  69                 short   bt_trksec;      /* track and sector number */
  70         } bt_bad[NDKBAD];
  71 };
  72
  73 #ifdef  __cplusplus
  74 }
  75 #endif
  76
  77 #endif  /* _SYS_DKBAD_H */