dkbad.h

Macros

BSE               X
CONT              X
ECC               X
MAXBAD            X
SSE               X

struct's

bt_bad            X
dkbad             X

   1: /*
   2:  * Copyright (c) 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)dkbad.h	1.1 (2.10BSD Berkeley) 12/1/86
   7:  */
   8: 
   9: /*
  10:  * Definitions needed to perform bad sector
  11:  * revectoring ala DEC STD 144.
  12:  *
  13:  * The bad sector information is located in the
  14:  * first 5 even numbered sectors of the last
  15:  * track of the disk pack.  There are five
  16:  * identical copies of the information, described
  17:  * by the dkbad structure.
  18:  *
  19:  * Replacement sectors are allocated starting with
  20:  * the first sector before the bad sector information
  21:  * and working backwards towards the beginning of
  22:  * the disk.  A maximum of 126 bad sectors are supported.
  23:  * The position of the bad sector in the bad sector table
  24:  * determines which replacement sector it corresponds to.
  25:  *
  26:  * The bad sector information and replacement sectors
  27:  * are conventionally only accessible through the
  28:  * 'c' file system partition of the disk.  If that
  29:  * partition is used for a file system, the user is
  30:  * responsible for making sure that it does not overlap
  31:  * the bad sector information or any replacement sector.s
  32:  */
  33: 
  34: /*
  35:  * The 2.10BSD system defines MAXBAD as 32, not 126, although there
  36:  * should be no problem with increasing that value.  It's your basic
  37:  * space tradeoff.  Also, 2.10 drivers tend to have the bad sector
  38:  * information available through the 'h' file system partition, although
  39:  * there are exceptions to this rule.  Note, this value is also present
  40:  * in the bad144 program.
  41:  */
  42: #define MAXBAD  32          /* Maximum bad sectors supported */
  43: 
  44: struct dkbad {
  45:     long    bt_csn;         /* cartridge serial number */
  46:     u_short bt_mbz;         /* unused; should be 0 */
  47:     u_short bt_flag;        /* -1 => alignment cartridge */
  48:     struct bt_bad {
  49:         u_short bt_cyl;     /* cylinder number of bad sector */
  50:         u_short bt_trksec;  /* track and sector number */
  51:     } bt_bad[MAXBAD];
  52: };
  53: 
  54: #define ECC 0
  55: #define SSE 1
  56: #define BSE 2
  57: #define CONT    3