xref: /freebsd-10-stable/sys/sys/disklabel.h

/*-
 * 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.
 * 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
 * $FreeBSD: stable/10/sys/sys/disklabel.h 322860 2017-08-24 21:44:23Z mckusick $
 */

#ifndef _SYS_DISKLABEL_H_
#define	_SYS_DISKLABEL_H_

#ifndef _KERNEL
#include <sys/types.h>
#endif
#include <sys/ioccom.h>

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

/*
 * 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 these should be defined per controller (or drive) elsewhere, not here! */
#if defined(__i386__) || defined(__amd64__) || defined(__arm__) || \
    defined(__ia64__) || defined(__powerpc__) || defined(__mips__)
#define LABELSECTOR	1			/* sector containing label */
#define LABELOFFSET	0			/* offset of label in sector */
#endif

#define DISKMAGIC	((u_int32_t)0x82564557)	/* The disk magic number */
#ifndef MAXPARTITIONS
#define	MAXPARTITIONS	8
#endif

/* Size of bootblock area in sector-size neutral bytes */
#define BBSIZE		8192

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

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" */

	char      d_packname[16];	/* pack identifier */

			/* 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 */
		u_int16_t p_cpg;	/* filesystem cylinders per group */
	} d_partitions[MAXPARTITIONS];	/* actually may be more */
};

#ifdef CTASSERT
CTASSERT(sizeof(struct disklabel) == 148 + MAXPARTITIONS * 16);
#endif

static __inline u_int16_t dkcksum(struct disklabel *lp);
static __inline u_int16_t
dkcksum(struct disklabel *lp)
{
	u_int16_t *start, *end;
	u_int16_t sum = 0;

	start = (u_int16_t *)lp;
	end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
	while (start < end)
		sum ^= *start++;
	return (sum);
}


/* 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 */
#define	DTYPE_VINUM		12		/* vinum volume */
#define	DTYPE_DOC2K		13		/* Msys DiskOnChip */
#define	DTYPE_RAID		14		/* CMU RAIDFrame */
#define	DTYPE_JFS2		16		/* IBM JFS 2 */

#ifdef DKTYPENAMES
static const char *dktypenames[] = {
	"unknown",
	"SMD",
	"MSCP",
	"old DEC",
	"SCSI",
	"ESDI",
	"ST506",
	"HP-IB",
	"HP-FL",
	"type 9",
	"floppy",
	"CCD",
	"Vinum",
	"DOC2K",
	"Raid",
	"?",
	"jfs",
	NULL
};
#define DKMAXTYPES	(sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
#endif

/*
 * Filesystem type and version.
 * Used to interpret other filesystem-specific
 * per-partition information.
 */
#define	FS_UNUSED	0		/* unused */
#define	FS_SWAP		1		/* swap */
#define	FS_V6		2		/* Sixth Edition */
#define	FS_V7		3		/* Seventh Edition */
#define	FS_SYSV		4		/* System V */
#define	FS_V71K		5		/* V7 with 1K blocks (4.1, 2.9) */
#define	FS_V8		6		/* Eighth Edition, 4K blocks */
#define	FS_BSDFFS	7		/* 4.2BSD fast filesystem */
#define	FS_MSDOS	8		/* MSDOS filesystem */
#define	FS_BSDLFS	9		/* 4.4BSD log-structured filesystem */
#define	FS_OTHER	10		/* in use, but unknown/unsupported */
#define	FS_HPFS		11		/* OS/2 high-performance filesystem */
#define	FS_ISO9660	12		/* ISO 9660, normally CD-ROM */
#define	FS_BOOT		13		/* partition contains bootstrap */
#define	FS_VINUM	14		/* Vinum drive */
#define	FS_RAID		15		/* RAIDFrame drive */
#define	FS_FILECORE	16		/* Acorn Filecore Filing System */
#define	FS_EXT2FS	17		/* ext2fs */
#define	FS_NTFS		18		/* Windows/NT file system */
#define	FS_CCD		20		/* concatenated disk component */
#define	FS_JFS2		21		/* IBM JFS2 */
#define	FS_HAMMER	22		/* DragonFlyBSD Hammer FS */
#define	FS_HAMMER2	23		/* DragonFlyBSD Hammer2 FS */
#define	FS_UDF		24		/* UDF */
#define	FS_EFS		26		/* SGI's Extent File system */
#define	FS_ZFS		27		/* Sun's ZFS */
#define	FS_NANDFS	30		/* FreeBSD nandfs (NiLFS derived) */

#ifdef	FSTYPENAMES
static const char *fstypenames[] = {
	"unused",
	"swap",
	"Version 6",
	"Version 7",
	"System V",
	"4.1BSD",
	"Eighth Edition",
	"4.2BSD",
	"MSDOS",
	"4.4LFS",
	"unknown",
	"HPFS",
	"ISO9660",
	"boot",
	"vinum",
	"raid",
	"Filecore",
	"EXT2FS",
	"NTFS",
	"?",
	"ccd",
	"jfs",
	"HAMMER",
	"HAMMER2",
	"UDF",
	"?",
	"EFS",
	"ZFS",
	"?",
	"?",
	"nandfs",
	NULL
};
#define FSMAXTYPES	(sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
#endif

/*
 * flags shared by various drives:
 */
#define	D_REMOVABLE	0x01		/* removable media */
#define	D_ECC		0x02		/* supports ECC */
#define	D_BADSECT	0x04		/* supports bad sector forw. */
#define	D_RAMDISK	0x08		/* disk emulator */
#define	D_CHAIN		0x10		/* can do back-back transfers */

/*
 * NB: <sys/disk.h> defines ioctls from 'd'/128 and up.
 */

/*
 * Functions for proper encoding/decoding of struct disklabel into/from
 * bytestring.
 */
void bsd_partition_le_dec(u_char *ptr, struct partition *d);
int bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart);
void bsd_partition_le_enc(u_char *ptr, struct partition *d);
void bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d);

#ifndef _KERNEL
__BEGIN_DECLS
struct disklabel *getdiskbyname(const char *);
__END_DECLS
#endif

#endif /* !_SYS_DISKLABEL_H_ */