root / lab4 / .minix-src / include / sys / dkbad.h @ 13
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| 1 | 13 | up20180614 | /* $NetBSD: dkbad.h,v 1.15 2005/12/26 18:41:36 perry Exp $ */
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| 2 | |||
| 3 | /*-
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| 4 | * Copyright (c) 1982, 1986, 1993, 1994
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | *
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| 31 | * @(#)dkbad.h 8.2 (Berkeley) 7/10/94
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| 32 | */
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| 33 | |||
| 34 | #ifndef _SYS_DKBAD_H_
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| 35 | #define _SYS_DKBAD_H_
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| 36 | |||
| 37 | /*
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| 38 | * Definitions needed to perform bad sector revectoring ala DEC STD 144.
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| 39 | *
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| 40 | * The bad sector information is located in the first 5 even numbered
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| 41 | * sectors of the last track of the disk pack. There are five identical
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| 42 | * copies of the information, described by the dkbad structure.
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| 43 | *
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| 44 | * Replacement sectors are allocated starting with the first sector before
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| 45 | * the bad sector information and working backwards towards the beginning of
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| 46 | * the disk. A maximum of 126 bad sectors are supported. The position of
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| 47 | * the bad sector in the bad sector table determines which replacement sector
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| 48 | * it corresponds to.
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| 49 | *
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| 50 | * The bad sector information and replacement sectors are conventionally
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| 51 | * only accessible through the 'c' file system partition of the disk. If
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| 52 | * that partition is used for a file system, the user is responsible for
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| 53 | * making sure that it does not overlap the bad sector information or any
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| 54 | * replacement sectors.
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| 55 | */
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| 56 | #define NBT_BAD 126 |
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| 57 | |||
| 58 | struct dkbad {
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| 59 | int32_t bt_csn; /* cartridge serial number */
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| 60 | uint16_t bt_mbz; /* unused; should be 0 */
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| 61 | uint16_t bt_flag; /* -1 => alignment cartridge */
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| 62 | struct bt_bad {
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| 63 | uint16_t bt_cyl; /* cylinder number of bad sector */
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| 64 | uint16_t bt_trksec; /* track and sector number */
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| 65 | } bt_bad[NBT_BAD]; |
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| 66 | }; |
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| 67 | |||
| 68 | /*
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| 69 | * An indicator that the bad block handling is available. This is used
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| 70 | * to conditionally enable code that performs badblock re-mapping.
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| 71 | */
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| 72 | #define HAS_BAD144_HANDLING
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| 73 | |||
| 74 | #define ECC 0 |
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| 75 | #define SSE 1 |
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| 76 | #define BSE 2 |
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| 77 | #define CONT 3 |
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| 78 | |||
| 79 | #ifdef _KERNEL
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| 80 | int isbad(struct dkbad *, int, int, int); |
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| 81 | #endif
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| 82 | #endif /* _SYS_DKBAD_H_ */ |