FreeBSD/Linux Kernel Cross Reference
sys/sys/dkbad.h
1 /*-
2 * Copyright (c) 1982, 1986, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)dkbad.h 8.2 (Berkeley) 7/10/94
34 * $FreeBSD$
35 */
36
37 #ifndef _SYS_DKBAD_H_
38 #define _SYS_DKBAD_H_
39
40 /*
41 * Definitions needed to perform bad sector revectoring ala DEC STD 144.
42 *
43 * The bad sector information is located in the first 5 even numbered
44 * sectors of the last track of the disk pack. There are five identical
45 * copies of the information, described by the dkbad structure.
46 *
47 * Replacement sectors are allocated starting with the first sector before
48 * the bad sector information and working backwards towards the beginning of
49 * the disk. A maximum of 126 bad sectors are supported. The position of
50 * the bad sector in the bad sector table determines which replacement sector
51 * it corresponds to.
52 *
53 * The bad sector information and replacement sectors are conventionally
54 * only accessible through the 'c' file system partition of the disk. If
55 * that partition is used for a file system, the user is responsible for
56 * making sure that it does not overlap the bad sector information or any
57 * replacement sectors.
58 */
59
60 #define DKBAD_MAGIC 0x4321 /* normal value for bt_flag */
61 #define DKBAD_MAXBAD 126 /* maximum bad sectors supported */
62 #define DKBAD_NOCYL 0xffff /* cylinder to mark end of disk table */
63 #define DKBAD_NOTRKSEC 0xffff /* track/sector to mark end */
64
65 struct dkbad {
66 int32_t bt_csn; /* cartridge serial number */
67 u_int16_t bt_mbz; /* unused; should be 0 */
68 u_int16_t bt_flag; /* -1 => alignment cartridge */
69 struct bt_bad {
70 u_int16_t bt_cyl; /* cylinder number of bad sector */
71 u_int16_t bt_trksec; /* track and sector number */
72 } bt_bad[DKBAD_MAXBAD];
73 };
74
75 #define ECC 0
76 #define SSE 1
77 #define BSE 2
78 #define CONT 3
79
80 #ifdef KERNEL
81 #define DKBAD_NOSECT (-1) /* sector to mark end of core table */
82
83 struct dkbad_intern {
84 daddr_t bi_maxspare; /* last spare sector */
85 u_int bi_nbad; /* actual dimension of bi_badsect[] */
86 long bi_bad[DKBAD_MAXBAD + 1]; /* actually usually less */
87 };
88
89 struct buf;
90 struct disklabel;
91
92 struct dkbad_intern *internbad144 __P((struct dkbad *btp,
93 struct disklabel *lp));
94 char *readbad144 __P((dev_t dev, void (*strat)(struct buf *bp),
95 struct disklabel *lp, struct dkbad *btp));
96 daddr_t transbad144 __P((struct dkbad_intern *bip, daddr_t blkno));
97 #endif
98
99 #endif /* !_SYS_DKBAD_H_ */
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