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Annotation of sys/sys/dkbad.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: dkbad.h,v 1.4 2003/06/02 23:28:21 millert Exp $       */
                      2: /*     $NetBSD: dkbad.h,v 1.10 1994/12/25 13:14:21 pk Exp $    */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1982, 1986, 1993, 1994
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)dkbad.h     8.2 (Berkeley) 7/10/94
                     33:  */
                     34:
                     35: #ifndef _SYS_DKBAD_H_
                     36: #define _SYS_DKBAD_H_
                     37:
                     38: /*
                     39:  * Definitions needed to perform bad sector revectoring ala DEC STD 144.
                     40:  *
                     41:  * The bad sector information is located in the first 5 even numbered
                     42:  * sectors of the last track of the disk pack.  There are five identical
                     43:  * copies of the information, described by the dkbad structure.
                     44:  *
                     45:  * Replacement sectors are allocated starting with the first sector before
                     46:  * the bad sector information and working backwards towards the beginning of
                     47:  * the disk.  A maximum of 126 bad sectors are supported.  The position of
                     48:  * the bad sector in the bad sector table determines which replacement sector
                     49:  * it corresponds to.
                     50:  *
                     51:  * The bad sector information and replacement sectors are conventionally
                     52:  * only accessible through the 'c' file system partition of the disk.  If
                     53:  * that partition is used for a file system, the user is responsible for
                     54:  * making sure that it does not overlap the bad sector information or any
                     55:  * replacement sectors.
                     56:  */
                     57: #define NBT_BAD 126
                     58:
                     59: struct dkbad {
                     60:        int32_t   bt_csn;               /* cartridge serial number */
                     61:        u_int16_t bt_mbz;               /* unused; should be 0 */
                     62:        u_int16_t bt_flag;              /* -1 => alignment cartridge */
                     63:        struct bt_bad {
                     64:                u_int16_t bt_cyl;       /* cylinder number of bad sector */
                     65:                u_int16_t bt_trksec;    /* track and sector number */
                     66:        } bt_bad[NBT_BAD];
                     67: };
                     68:
                     69: #define        ECC     0
                     70: #define        SSE     1
                     71: #define        BSE     2
                     72: #define        CONT    3
                     73:
                     74: #endif /* _SYS_DKBAD_H_ */