disklabel.h

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/*
 * 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	8.1 (Berkeley) 6/2/93
 */

#ifndef _SYS_DISKLABEL_H_
#define	_SYS_DISKLABEL_H_

/*
 * Disk description table, see disktab(5)
 */
#define	_PATH_DISKTAB	"/etc/disktab"
#define	DISKTAB		"/etc/disktab"		/* deprecated */

/*
 * Each disk has a label which includes information about the hardware
 * disk geometry, filesystem partitions, and drive specific information.
 * The label is in block 0 or 1, possibly offset from the beginning
 * to leave room for a bootstrap, etc.
 */

/*
 * XXX the following will go away when conversion to the slice version is
 * complete: OURPART, RAWPART, readMSPtolabel, readMBRtolabel, dkminor,
 * the DOSified readdisklabel, DOS stuff in this file.
 */

/* XXX these should be defined per controller (or drive) elsewhere, not here! */
#ifdef __i386__
#define LABELSECTOR	1			/* sector containing label */
#define LABELOFFSET	0			/* offset of label in sector */
#define	OURPART		2			/* partition is 'all BSD' */
#define	RAWPART		3			/* partition is 'all device' */
#define readMSPtolabel readMBRtolabel
#endif

#ifndef readMSPtolabel
#define readMSPtolabel(a,b,c,d,e)		/* zap calls if irrelevant */
#endif

#ifdef	tahoe
#define RAWPART		0
#endif

#ifndef	RAWPART
#define	RAWPART		2
#endif

#ifndef	OURPART
#define	OURPART		RAWPART			/* by default it's all ours */
#endif

#ifndef	LABELSECTOR
#define LABELSECTOR	0			/* sector containing label */
#endif

#ifndef	LABELOFFSET
#define LABELOFFSET	64			/* offset of label in sector */
#endif

#define DISKMAGIC	((u_long) 0x82564557)	/* The disk magic number */
#ifndef MAXPARTITIONS
#define	MAXPARTITIONS	8
#endif

#define	LABEL_PART	2		/* partition containing label */
#define	RAW_PART	2		/* partition containing whole disk */
#define	SWAP_PART	1		/* partition normally containing swap */

#ifndef LOCORE
struct disklabel {
	u_long	d_magic;		/* the magic number */
	short	d_type;			/* drive type */
	short	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.
	 */
#if defined(KERNEL) || defined(STANDALONE)
	char	d_packname[16];			/* pack identifier */
#else
	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
#endif	/* ! KERNEL or STANDALONE */
			/* disk geometry: */
	u_long	d_secsize;		/* # of bytes per sector */
	u_long	d_nsectors;		/* # of data sectors per track */
	u_long	d_ntracks;		/* # of tracks per cylinder */
	u_long	d_ncylinders;		/* # of data cylinders per unit */
	u_long	d_secpercyl;		/* # of data sectors per cylinder */
	u_long	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_short	d_sparespertrack;	/* # of spare sectors per track */
	u_short	d_sparespercyl;		/* # of spare sectors per cylinder */
	/*
	 * Alternate cylinders include maintenance, replacement,
	 * configuration description areas, etc.
	 */
	u_long	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_short	d_rpm;			/* rotational speed */
	u_short	d_interleave;		/* hardware sector interleave */
	u_short	d_trackskew;		/* sector 0 skew, per track */
	u_short	d_cylskew;		/* sector 0 skew, per cylinder */
	u_long	d_headswitch;		/* head switch time, usec */
	u_long	d_trkseek;		/* track-to-track seek, usec */
	u_long	d_flags;		/* generic flags */
#define NDDATA 5
	u_long	d_drivedata[NDDATA];	/* drive-type specific information */
#define NSPARE 5
	u_long	d_spare[NSPARE];	/* reserved for future use */
	u_long	d_magic2;		/* the magic number (again) */
	u_short	d_checksum;		/* xor of data incl. partitions */

			/* filesystem and partition information: */
	u_short	d_npartitions;		/* number of partitions in following */
	u_long	d_bbsize;		/* size of boot area at sn0, bytes */
	u_long	d_sbsize;		/* max size of fs superblock, bytes */
	struct	partition {		/* the partition table */
		u_long	p_size;		/* number of sectors in partition */
		u_long	p_offset;	/* starting sector */
		u_long	p_fsize;	/* filesystem basic fragment size */
		u_char	p_fstype;	/* filesystem type, see below */
		u_char	p_frag;		/* filesystem fragments per block */
		union {
			u_short	cpg;	/* UFS: FS cylinders per group */
			u_short	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 */
};
#else /* LOCORE */
	/*
	 * offsets for asm boot files.
	 */
	.set	d_secsize,40
	.set	d_nsectors,44
	.set	d_ntracks,48
	.set	d_ncylinders,52
	.set	d_secpercyl,56
	.set	d_secperunit,60
	.set	d_end_,276		/* size of disk label */
#endif /* LOCORE */

/* d_type values: */
#define	DTYPE_SMD		1		/* SMD, XSMD; VAX hp/up */
#define	DTYPE_MSCP		2		/* MSCP */
#define	DTYPE_DEC		3		/* other DEC (rk, rl) */
#define	DTYPE_SCSI		4		/* SCSI */
#define	DTYPE_ESDI		5		/* ESDI interface */
#define	DTYPE_ST506		6		/* ST506 etc. */
#define	DTYPE_HPIB		7		/* CS/80 on HP-IB */
#define	DTYPE_HPFL		8		/* HP Fiber-link */
#define	DTYPE_FLOPPY		10		/* floppy */
#define	DTYPE_CCD		11		/* concatenated disk */

/* d_subtype values: */
#define DSTYPE_INDOSPART	0x8		/* is inside dos partition */
#define DSTYPE_DOSPART(s)	((s) & 3)	/* dos partition number */
#define DSTYPE_GEOMETRY		0x10		/* drive params in label */

#ifdef DKTYPENAMES
static char *dktypenames[] = {
	"unknown",
	"SMD",
	"MSCP",
	"old DEC",