lib/libukfs/ukfs_int_disklabel.h

   1 /*      $NetBSD: ukfs_int_disklabel.h,v 1.1 2009/10/07 20:51:00 pooka Exp $     */
   2
   3 /*
   4  * Modified copy of disklabel.h so that ukfs doesn't have to depend
   5  * on NetBSD headers.  Contains just about only "struct disklabel".
   6  * The on-disk disklabel doesn't really change format, so no need
   7  * to track this against NetBSD changes.
   8  */
   9
  10 /*
  11  * Copyright (c) 1987, 1988, 1993
  12  *      The Regents of the University of California.  All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
  39  */
  40
  41 #ifndef LIB_UKFS_DISKLABEL_H_
  42 #define LIB_UKFS_DISKLABEL_H_
  43
  44 #include <sys/types.h>
  45
  46 #include <stdint.h>
  47
  48 #define UKFS_MAXPARTITIONS      22
  49 #define UKFS_DISKMAGIC  ((uint32_t)0x82564557)  /* The disk magic number */
  50
  51 struct ukfs__disklabel {
  52         uint32_t d_magic;               /* the magic number */
  53         uint16_t d_type;                /* drive type */
  54         uint16_t d_subtype;             /* controller/d_type specific */
  55         char      d_typename[16];       /* type name, e.g. "eagle" */
  56
  57         /*
  58          * d_packname contains the pack identifier and is returned when
  59          * the disklabel is read off the disk or in-core copy.
  60          * d_boot0 and d_boot1 are the (optional) names of the
  61          * primary (block 0) and secondary (block 1-15) bootstraps
  62          * as found in /usr/mdec.  These are returned when using
  63          * getdiskbyname(3) to retrieve the values from /etc/disktab.
  64          */
  65         union {
  66                 char    un_d_packname[16];      /* pack identifier */
  67                 struct {
  68                         char *un_d_boot0;       /* primary bootstrap name */
  69                         char *un_d_boot1;       /* secondary bootstrap name */
  70                 } un_b;
  71         } d_un;
  72 #define d_packname      d_un.un_d_packname
  73 #define d_boot0         d_un.un_b.un_d_boot0
  74 #define d_boot1         d_un.un_b.un_d_boot1
  75
  76                         /* disk geometry: */
  77         uint32_t d_secsize;             /* # of bytes per sector */
  78         uint32_t d_nsectors;            /* # of data sectors per track */
  79         uint32_t d_ntracks;             /* # of tracks per cylinder */
  80         uint32_t d_ncylinders;          /* # of data cylinders per unit */
  81         uint32_t d_secpercyl;           /* # of data sectors per cylinder */
  82         uint32_t d_secperunit;          /* # of data sectors per unit */
  83
  84         /*
  85          * Spares (bad sector replacements) below are not counted in
  86          * d_nsectors or d_secpercyl.  Spare sectors are assumed to
  87          * be physical sectors which occupy space at the end of each
  88          * track and/or cylinder.
  89          */
  90         uint16_t d_sparespertrack;      /* # of spare sectors per track */
  91         uint16_t d_sparespercyl;        /* # of spare sectors per cylinder */
  92         /*
  93          * Alternative cylinders include maintenance, replacement,
  94          * configuration description areas, etc.
  95          */
  96         uint32_t d_acylinders;          /* # of alt. cylinders per unit */
  97
  98                         /* hardware characteristics: */
  99         /*
 100          * d_interleave, d_trackskew and d_cylskew describe perturbations
 101          * in the media format used to compensate for a slow controller.
 102          * Interleave is physical sector interleave, set up by the
 103          * formatter or controller when formatting.  When interleaving is
 104          * in use, logically adjacent sectors are not physically
 105          * contiguous, but instead are separated by some number of
 106          * sectors.  It is specified as the ratio of physical sectors
 107          * traversed per logical sector.  Thus an interleave of 1:1
 108          * implies contiguous layout, while 2:1 implies that logical
 109          * sector 0 is separated by one sector from logical sector 1.
 110          * d_trackskew is the offset of sector 0 on track N relative to
 111          * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
 112          * is the offset of sector 0 on cylinder N relative to sector 0
 113          * on cylinder N-1.
 114          */
 115         uint16_t d_rpm;         /* rotational speed */
 116         uint16_t d_interleave;          /* hardware sector interleave */
 117         uint16_t d_trackskew;           /* sector 0 skew, per track */
 118         uint16_t d_cylskew;             /* sector 0 skew, per cylinder */
 119         uint32_t d_headswitch;          /* head switch time, usec */
 120         uint32_t d_trkseek;             /* track-to-track seek, usec */
 121         uint32_t d_flags;               /* generic flags */
 122 #define NDDATA 5
 123         uint32_t d_drivedata[NDDATA];   /* drive-type specific information */
 124 #define NSPARE 5
 125         uint32_t d_spare[NSPARE];       /* reserved for future use */
 126         uint32_t d_magic2;              /* the magic number (again) */
 127         uint16_t d_checksum;            /* xor of data incl. partitions */
 128
 129                         /* filesystem and partition information: */
 130         uint16_t d_npartitions; /* number of partitions in following */
 131         uint32_t d_bbsize;              /* size of boot area at sn0, bytes */
 132         uint32_t d_sbsize;              /* max size of fs superblock, bytes */
 133         struct  ukfs__partition {       /* the partition table */
 134                 uint32_t p_size;        /* number of sectors in partition */
 135                 uint32_t p_offset;      /* starting sector */
 136                 union {
 137                         uint32_t fsize; /* FFS, ADOS:
 138                                             filesystem basic fragment size */
 139                         uint32_t cdsession; /* ISO9660: session offset */
 140                 } __partition_u2;
 141 #define p_fsize         __partition_u2.fsize
 142 #define p_cdsession     __partition_u2.cdsession
 143                 uint8_t p_fstype;       /* filesystem type, see below */
 144                 uint8_t p_frag; /* filesystem fragments per block */
 145                 union {
 146                         uint16_t cpg;   /* UFS: FS cylinders per group */
 147                         uint16_t sgs;   /* LFS: FS segment shift */
 148                 } __partition_u1;
 149 #define p_cpg   __partition_u1.cpg
 150 #define p_sgs   __partition_u1.sgs
 151         } d_partitions[UKFS_MAXPARTITIONS];     /* actually may be more */
 152 };
 153
 154 uint16_t        ukfs__disklabel_dkcksum(struct ukfs__disklabel *);
 155 int             ukfs__disklabel_scan(struct ukfs__disklabel *, char *, size_t);
 156
 157 #endif /* !LIB_UKFS_DISKLABEL_H_ */