101 lines
4.1 KiB
C
101 lines
4.1 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1993
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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 8.1 (Berkeley) 6/2/93
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* $Id: dkbad.h,v 1.5 1995/04/15 23:21:28 bde Exp $
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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 DKBAD_MAGIC 0x4321 /* normal value for bt_flag */
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#define DKBAD_MAXBAD 126 /* maximum bad sectors supported */
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#define DKBAD_NOCYL 0xffff /* cylinder to mark end of disk table */
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#define DKBAD_NOTRKSEC 0xffff /* track/sector to mark end */
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struct dkbad {
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long bt_csn; /* cartridge serial number */
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u_short bt_mbz; /* unused; should be 0 */
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u_short bt_flag; /* -1 => alignment cartridge */
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struct bt_bad {
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u_short bt_cyl; /* cylinder number of bad sector */
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u_short bt_trksec; /* track and sector number */
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} bt_bad[DKBAD_MAXBAD];
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};
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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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#include <sys/conf.h>
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#define DKBAD_NOSECT (-1) /* sector to mark end of core table */
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struct dkbad_intern {
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daddr_t bi_maxspare; /* last spare sector */
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u_int bi_nbad; /* actual dimension of bi_badsect[] */
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long bi_bad[DKBAD_MAXBAD + 1]; /* actually usually less */
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};
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struct disklabel;
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struct dkbad_intern *internbad144 __P((struct dkbad *btp,
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struct disklabel *lp));
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char *readbad144 __P((dev_t dev, d_strategy_t *strat,
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struct disklabel *lp, struct dkbad *btp));
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daddr_t transbad144 __P((struct dkbad_intern *bip, daddr_t blkno));
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#endif
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#endif /* !_SYS_DKBAD_H_ */
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