The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/dkbad.h

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    1 /*      $NetBSD: dkbad.h,v 1.13 2003/08/07 16:34:02 agc Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1982, 1986, 1993, 1994
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)dkbad.h     8.2 (Berkeley) 7/10/94
   32  */
   33 
   34 #ifndef _SYS_DKBAD_H_
   35 #define _SYS_DKBAD_H_
   36 
   37 /*
   38  * Definitions needed to perform bad sector revectoring ala DEC STD 144.
   39  *
   40  * The bad sector information is located in the first 5 even numbered
   41  * sectors of the last track of the disk pack.  There are five identical
   42  * copies of the information, described by the dkbad structure.
   43  *
   44  * Replacement sectors are allocated starting with the first sector before
   45  * the bad sector information and working backwards towards the beginning of
   46  * the disk.  A maximum of 126 bad sectors are supported.  The position of
   47  * the bad sector in the bad sector table determines which replacement sector
   48  * it corresponds to.
   49  *
   50  * The bad sector information and replacement sectors are conventionally
   51  * only accessible through the 'c' file system partition of the disk.  If
   52  * that partition is used for a file system, the user is responsible for
   53  * making sure that it does not overlap the bad sector information or any
   54  * replacement sectors.
   55  */
   56 #define NBT_BAD 126
   57 
   58 struct dkbad {
   59         int32_t   bt_csn;               /* cartridge serial number */
   60         u_int16_t bt_mbz;               /* unused; should be 0 */
   61         u_int16_t bt_flag;              /* -1 => alignment cartridge */
   62         struct bt_bad {
   63                 u_int16_t bt_cyl;       /* cylinder number of bad sector */
   64                 u_int16_t bt_trksec;    /* track and sector number */
   65         } bt_bad[NBT_BAD];
   66 };
   67 
   68 /*
   69  * An indicator that the bad block handling is available. This is used
   70  * to conditionally enable code that performs badblock re-mapping.
   71  */
   72 #define HAS_BAD144_HANDLING
   73 
   74 #define ECC     0
   75 #define SSE     1
   76 #define BSE     2
   77 #define CONT    3
   78 
   79 #ifdef _KERNEL
   80 int isbad(struct dkbad *, int, int, int);
   81 #endif
   82 #endif /* _SYS_DKBAD_H_ */

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