root / lab4 / .minix-src / include / sys / dkbad.h @ 14
History | View | Annotate | Download (3.27 KB)
| 1 | 13 | up20180614 | /* $NetBSD: dkbad.h,v 1.15 2005/12/26 18:41:36 perry 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 | uint16_t bt_mbz; /* unused; should be 0 */
|
||
| 61 | uint16_t bt_flag; /* -1 => alignment cartridge */
|
||
| 62 | struct bt_bad {
|
||
| 63 | uint16_t bt_cyl; /* cylinder number of bad sector */
|
||
| 64 | uint16_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_ */ |