summaryrefslogtreecommitdiff
path: root/lib/libukfs/ukfs_int_disklabel.h
blob: 304f220ea352f42f88740190ef31357221655250 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/*	$NetBSD: ukfs_int_disklabel.h,v 1.3 2011/02/22 15:42:15 pooka Exp $	*/

/*
 * Modified copy of disklabel.h so that ukfs doesn't have to depend
 * on NetBSD headers.  Contains just about only "struct disklabel".
 * The on-disk disklabel doesn't really change format, so no need
 * to track this against NetBSD changes.
 */

/*
 * 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. 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 LIB_UKFS_DISKLABEL_H_
#define	LIB_UKFS_DISKLABEL_H_

#include <sys/types.h>

#include <stdint.h>

#define	UKFS_MAXPARTITIONS	22
#define	UKFS_DISKMAGIC	((uint32_t)0x82564557)	/* The disk magic number */

struct ukfs__disklabel {
	uint32_t d_magic;		/* the magic number */
	uint16_t d_type;		/* drive type */
	uint16_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: */
	uint32_t d_secsize;		/* # of bytes per sector */
	uint32_t d_nsectors;		/* # of data sectors per track */
	uint32_t d_ntracks;		/* # of tracks per cylinder */
	uint32_t d_ncylinders;		/* # of data cylinders per unit */
	uint32_t d_secpercyl;		/* # of data sectors per cylinder */
	uint32_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.
	 */
	uint16_t d_sparespertrack;	/* # of spare sectors per track */
	uint16_t d_sparespercyl;	/* # of spare sectors per cylinder */
	/*
	 * Alternative cylinders include maintenance, replacement,
	 * configuration description areas, etc.
	 */
	uint32_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.
	 */
	uint16_t d_rpm;		/* rotational speed */
	uint16_t d_interleave;		/* hardware sector interleave */
	uint16_t d_trackskew;		/* sector 0 skew, per track */
	uint16_t d_cylskew;		/* sector 0 skew, per cylinder */
	uint32_t d_headswitch;		/* head switch time, usec */
	uint32_t d_trkseek;		/* track-to-track seek, usec */
	uint32_t d_flags;		/* generic flags */
#define	NDDATA 5
	uint32_t d_drivedata[NDDATA];	/* drive-type specific information */
#define	NSPARE 5
	uint32_t d_spare[NSPARE];	/* reserved for future use */
	uint32_t d_magic2;		/* the magic number (again) */
	uint16_t d_checksum;		/* xor of data incl. partitions */

			/* filesystem and partition information: */
	uint16_t d_npartitions;	/* number of partitions in following */
	uint32_t d_bbsize;		/* size of boot area at sn0, bytes */
	uint32_t d_sbsize;		/* max size of fs superblock, bytes */
	struct	ukfs__partition {	/* the partition table */
		uint32_t p_size;	/* number of sectors in partition */
		uint32_t p_offset;	/* starting sector */
		union {
			uint32_t fsize; /* FFS, ADOS:
					    filesystem basic fragment size */
			uint32_t cdsession; /* ISO9660: session offset */
		} __partition_u2;
#define	p_fsize		__partition_u2.fsize
#define	p_cdsession	__partition_u2.cdsession
		uint8_t p_fstype;	/* filesystem type, see below */
		uint8_t p_frag;	/* filesystem fragments per block */
		union {
			uint16_t cpg;	/* UFS: FS cylinders per group */
			uint16_t sgs;	/* LFS: FS segment shift */
		} __partition_u1;
#define	p_cpg	__partition_u1.cpg
#define	p_sgs	__partition_u1.sgs
	} d_partitions[UKFS_MAXPARTITIONS];	/* actually may be more */
};

uint16_t        ukfs__disklabel_dkcksum(struct ukfs__disklabel *, int);
int             ukfs__disklabel_scan(struct ukfs__disklabel *, int *,
				     char *, size_t);

#endif /* !LIB_UKFS_DISKLABEL_H_ */