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Annotation of Net2/sys/dkbad.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1982, 1986 The Regents of the University of California.
        !             3:  * 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     7.2 (Berkeley) 2/15/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Definitions needed to perform bad sector revectoring ala DEC STD 144.
        !            38:  *
        !            39:  * The bad sector information is located in the first 5 even numbered
        !            40:  * sectors of the last track of the disk pack.  There are five identical
        !            41:  * copies of the information, described by the dkbad structure.
        !            42:  *
        !            43:  * Replacement sectors are allocated starting with the first sector before
        !            44:  * the bad sector information and working backwards towards the beginning of
        !            45:  * the disk.  A maximum of 126 bad sectors are supported.  The position of
        !            46:  * the bad sector in the bad sector table determines which replacement sector
        !            47:  * it corresponds to.
        !            48:  *
        !            49:  * The bad sector information and replacement sectors are conventionally
        !            50:  * only accessible through the 'c' file system partition of the disk.  If
        !            51:  * that partition is used for a file system, the user is responsible for
        !            52:  * making sure that it does not overlap the bad sector information or any
        !            53:  * replacement sectors.
        !            54:  */
        !            55: struct dkbad {
        !            56:        long bt_csn;                    /* cartridge serial number */
        !            57:        u_short bt_mbz;                 /* unused; should be 0 */
        !            58:        u_short bt_flag;                /* -1 => alignment cartridge */
        !            59:        struct bt_bad {
        !            60:                u_short bt_cyl;         /* cylinder number of bad sector */
        !            61:                u_short bt_trksec;      /* track and sector number */
        !            62:        } bt_bad[126];
        !            63: };
        !            64: 
        !            65: #define        ECC     0
        !            66: #define        SSE     1
        !            67: #define        BSE     2
        !            68: #define        CONT    3

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