83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
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/* $NetBSD: dkbad.h,v 1.15 2005/12/26 18:41:36 perry Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)dkbad.h 8.2 (Berkeley) 7/10/94
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*/
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#ifndef _SYS_DKBAD_H_
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#define _SYS_DKBAD_H_
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/*
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* Definitions needed to perform bad sector revectoring ala DEC STD 144.
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*
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* The bad sector information is located in the first 5 even numbered
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* sectors of the last track of the disk pack. There are five identical
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* copies of the information, described by the dkbad structure.
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*
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* Replacement sectors are allocated starting with the first sector before
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* the bad sector information and working backwards towards the beginning of
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* the disk. A maximum of 126 bad sectors are supported. The position of
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* the bad sector in the bad sector table determines which replacement sector
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* it corresponds to.
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*
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* The bad sector information and replacement sectors are conventionally
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* only accessible through the 'c' file system partition of the disk. If
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* that partition is used for a file system, the user is responsible for
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* making sure that it does not overlap the bad sector information or any
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* replacement sectors.
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*/
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#define NBT_BAD 126
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struct dkbad {
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int32_t bt_csn; /* cartridge serial number */
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uint16_t bt_mbz; /* unused; should be 0 */
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uint16_t bt_flag; /* -1 => alignment cartridge */
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struct bt_bad {
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uint16_t bt_cyl; /* cylinder number of bad sector */
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uint16_t bt_trksec; /* track and sector number */
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} bt_bad[NBT_BAD];
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};
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/*
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* An indicator that the bad block handling is available. This is used
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* to conditionally enable code that performs badblock re-mapping.
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*/
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#define HAS_BAD144_HANDLING
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#define ECC 0
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#define SSE 1
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#define BSE 2
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#define CONT 3
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#ifdef _KERNEL
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int isbad(struct dkbad *, int, int, int);
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#endif
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#endif /* _SYS_DKBAD_H_ */
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