File: fdisklabel.h

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/*
 * Copyright (c) 1987, 1988 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.
 */

#define BSD_DISKMAGIC     ((u_long) 0x82564557)
#define	BSD_MAXPARTITIONS 8
#define BSD_LINUX_BOOTDIR "/usr/ucb/mdec"

#if defined (i386)
#define BSD_LABELSECTOR   1
#define BSD_LABELOFFSET   0
#define	BSD_BBSIZE        8192		/* size of boot area, with label */
#define	BSD_SBSIZE        8192		/* max size of fs superblock */
#elif defined (__alpha__)
#error LABELSECTOR, LABELOFFSET, BBSIZE & SBSIZE are undefined for __alpha__
#define BSD_LABELSECTOR   0
#define BSD_LABELOFFSET   0
#define	BSD_BBSIZE        0
#define	BSD_SBSIZE        0
#elif defined (__powerpc__)
/* LABELSECTOR, LABELOFFSET, BBSIZE & SBSIZE are undefined for __powerpc__ */
#define BSD_LABELSECTOR   0
#define BSD_LABELOFFSET   0
#define	BSD_BBSIZE        0
#define	BSD_SBSIZE        0
#elif defined (__mc68000__)
/* LABELSECTOR, LABELOFFSET, BBSIZE & SBSIZE are undefined for __powerpc__ */
#define BSD_LABELSECTOR   0
#define BSD_LABELOFFSET   0
#define	BSD_BBSIZE        0
#define	BSD_SBSIZE        0
#else
#error unknown architecture
#endif

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 bsd_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 */
		u_short	p_cpg;	        /* filesystem cylinders per group */
	} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
};

/* d_type values: */
#define	BSD_DTYPE_SMD		1		/* SMD, XSMD; VAX hp/up */
#define	BSD_DTYPE_MSCP		2		/* MSCP */
#define	BSD_DTYPE_DEC		3		/* other DEC (rk, rl) */
#define	BSD_DTYPE_SCSI		4		/* SCSI */
#define	BSD_DTYPE_ESDI		5		/* ESDI interface */
#define	BSD_DTYPE_ST506		6		/* ST506 etc. */
#define	BSD_DTYPE_HPIB		7		/* CS/80 on HP-IB */
#define BSD_DTYPE_HPFL		8		/* HP Fiber-link */
#define	BSD_DTYPE_FLOPPY	10		/* floppy */

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

#ifdef DKTYPENAMES
static char *bsd_dktypenames[] = {
	"unknown",
	"SMD",
	"MSCP",
	"old DEC",
	"SCSI",
	"ESDI",
	"ST506",
	"HP-IB",
	"HP-FL",
	"type 9",
	"floppy",
	0
};
#define BSD_DKMAXTYPES	(sizeof(bsd_dktypenames) / sizeof(bsd_dktypenames[0]) - 1)
#endif

/*
 * Filesystem type and version.
 * Used to interpret other filesystem-specific
 * per-partition information.
 */
#define	BSD_FS_UNUSED	0		/* unused */
#define	BSD_FS_SWAP    	1		/* swap */
#define	BSD_FS_V6      	2		/* Sixth Edition */
#define	BSD_FS_V7      	3		/* Seventh Edition */
#define	BSD_FS_SYSV    	4		/* System V */
#define	BSD_FS_V71K    	5		/* V7 with 1K blocks (4.1, 2.9) */
#define	BSD_FS_V8      	6		/* Eighth Edition, 4K blocks */
#define	BSD_FS_BSDFFS	7		/* 4.2BSD fast file system */
#define	BSD_FS_MSDOS	8		/* MS-DOS file system */
#define	BSD_FS_BSDLFS	9		/* 4.4BSD log-structured file system */
#define	BSD_FS_OTHER	10		/* in use, but unknown/unsupported */
#define	BSD_FS_HPFS	11		/* OS/2 high-performance file system */
#define	BSD_FS_ISO9660	12		/* ISO-9660 filesystem (cdrom) */
#define BSD_FS_ISOFS	BSD_FS_ISO9660
#define	BSD_FS_BOOT	13		/* partition contains bootstrap */
#define BSD_FS_ADOS	14		/* AmigaDOS fast file system */
#define BSD_FS_HFS	15		/* Macintosh HFS */

#ifdef	DKTYPENAMES
static struct systypes bsd_fstypes[] = {
        {BSD_FS_UNUSED, "unused"},
	{BSD_FS_SWAP,   "swap"},
	{BSD_FS_V6,     "Version 6"},
	{BSD_FS_V7,     "Version 7"},
	{BSD_FS_SYSV,   "System V"},
	{BSD_FS_V71K,   "4.1BSD"},
	{BSD_FS_V8,     "Eighth Edition"},
	{BSD_FS_BSDFFS, "4.2BSD"},
	{BSD_FS_MSDOS,  "MS-DOS"},
	{BSD_FS_BSDLFS, "4.4LFS"},
	{BSD_FS_OTHER,  "unknown"},
	{BSD_FS_HPFS,   "HPFS"},
	{BSD_FS_ISO9660,"ISO-9660"},
	{BSD_FS_BOOT,   "boot"},
	{BSD_FS_ADOS,   "ADOS"},
	{BSD_FS_HFS,    "HFS"}
};

#define BSD_FSMAXTYPES	(sizeof(bsd_fstypes) / sizeof(struct systypes))
#endif

/*
 * flags shared by various drives:
 */
#define	BSD_D_REMOVABLE	0x01		/* removable media */
#define	BSD_D_ECC      	0x02		/* supports ECC */
#define	BSD_D_BADSECT	0x04		/* supports bad sector forw. */
#define	BSD_D_RAMDISK	0x08		/* disk emulator */
#define	BSD_D_CHAIN    	0x10		/* can do back-back transfers */
#define	BSD_D_DOSPART	0x20		/* within MSDOS partition */