141 lines
6.1 KiB
C
141 lines
6.1 KiB
C
/* $NetBSD: disklbl.h,v 1.1 1996/01/16 15:15:52 leo Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1987, 1988, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)disklabel.h 8.2 (Berkeley) 7/10/94
|
|
*/
|
|
|
|
#ifndef DISKLABEL_H
|
|
#define DISKLABEL_H
|
|
|
|
#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
|
|
|
|
struct disklabel {
|
|
u_int32_t d_magic; /* the magic number */
|
|
u_int16_t d_type; /* drive type */
|
|
u_int16_t d_subtype; /* controller/d_type specific */
|
|
char d_typename[16]; /* type name, e.g. "eagle" */
|
|
|
|
/*
|
|
* d_packname contains the pack identifier and is returned when
|
|
* the disklabel is read off the disk or in-core copy.
|
|
* d_boot0 and d_boot1 are the (optional) names of the
|
|
* primary (block 0) and secondary (block 1-15) bootstraps
|
|
* as found in /usr/mdec. These are returned when using
|
|
* getdiskbyname(3) to retrieve the values from /etc/disktab.
|
|
*/
|
|
union {
|
|
char un_d_packname[16]; /* pack identifier */
|
|
struct {
|
|
char *un_d_boot0; /* primary bootstrap name */
|
|
char *un_d_boot1; /* secondary bootstrap name */
|
|
} un_b;
|
|
} d_un;
|
|
#define d_packname d_un.un_d_packname
|
|
#define d_boot0 d_un.un_b.un_d_boot0
|
|
#define d_boot1 d_un.un_b.un_d_boot1
|
|
|
|
/* disk geometry: */
|
|
u_int32_t d_secsize; /* # of bytes per sector */
|
|
u_int32_t d_nsectors; /* # of data sectors per track */
|
|
u_int32_t d_ntracks; /* # of tracks per cylinder */
|
|
u_int32_t d_ncylinders; /* # of data cylinders per unit */
|
|
u_int32_t d_secpercyl; /* # of data sectors per cylinder */
|
|
u_int32_t d_secperunit; /* # of data sectors per unit */
|
|
|
|
/*
|
|
* Spares (bad sector replacements) below are not counted in
|
|
* d_nsectors or d_secpercyl. Spare sectors are assumed to
|
|
* be physical sectors which occupy space at the end of each
|
|
* track and/or cylinder.
|
|
*/
|
|
u_int16_t d_sparespertrack; /* # of spare sectors per track */
|
|
u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
|
|
/*
|
|
* Alternate cylinders include maintenance, replacement, configuration
|
|
* description areas, etc.
|
|
*/
|
|
u_int32_t d_acylinders; /* # of alt. cylinders per unit */
|
|
|
|
/* hardware characteristics: */
|
|
/*
|
|
* d_interleave, d_trackskew and d_cylskew describe perturbations
|
|
* in the media format used to compensate for a slow controller.
|
|
* Interleave is physical sector interleave, set up by the
|
|
* formatter or controller when formatting. When interleaving is
|
|
* in use, logically adjacent sectors are not physically
|
|
* contiguous, but instead are separated by some number of
|
|
* sectors. It is specified as the ratio of physical sectors
|
|
* traversed per logical sector. Thus an interleave of 1:1
|
|
* implies contiguous layout, while 2:1 implies that logical
|
|
* sector 0 is separated by one sector from logical sector 1.
|
|
* d_trackskew is the offset of sector 0 on track N relative to
|
|
* sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
|
|
* is the offset of sector 0 on cylinder N relative to sector 0
|
|
* on cylinder N-1.
|
|
*/
|
|
u_int16_t d_rpm; /* rotational speed */
|
|
u_int16_t d_interleave; /* hardware sector interleave */
|
|
u_int16_t d_trackskew; /* sector 0 skew, per track */
|
|
u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
|
|
u_int32_t d_headswitch; /* head switch time, usec */
|
|
u_int32_t d_trkseek; /* track-to-track seek, usec */
|
|
u_int32_t d_flags; /* generic flags */
|
|
#define NDDATA 5
|
|
u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
|
|
#define NSPARE 5
|
|
u_int32_t d_spare[NSPARE]; /* reserved for future use */
|
|
u_int32_t d_magic2; /* the magic number (again) */
|
|
u_int16_t d_checksum; /* xor of data incl. partitions */
|
|
|
|
/* filesystem and partition information: */
|
|
u_int16_t d_npartitions; /* number of partitions in following */
|
|
u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
|
|
u_int32_t d_sbsize; /* max size of fs superblock, bytes */
|
|
struct partition { /* the partition table */
|
|
u_int32_t p_size; /* number of sectors in partition */
|
|
u_int32_t p_offset; /* starting sector */
|
|
u_int32_t p_fsize; /* filesystem basic fragment size */
|
|
u_int8_t p_fstype; /* filesystem type, see below */
|
|
u_int8_t p_frag; /* filesystem fragments per block */
|
|
union {
|
|
u_int16_t cpg; /* UFS: FS cylinders per group */
|
|
u_int16_t sgs; /* LFS: FS segment shift */
|
|
} __partition_u1;
|
|
#define p_cpg __partition_u1.cpg
|
|
#define p_sgs __partition_u1.sgs
|
|
} d_partitions[MAXPARTITIONS]; /* actually may be more */
|
|
};
|
|
|
|
#endif /* DISKLABEL_H */
|