[apple/xnu.git] / bsd / dev / disk_label.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1991 by NeXT Computer, Inc.
 *
 *	File:	bsd/dev/disk_label.h - NeXT disk label definition.
 *
 * HISTORY
 * 28-Mar-92  Doug Mitchell at NeXT
 *	Split out from <bsd/dev/disk.h>.
 */

#ifndef	_BSD_DEV_DISK_LABEL_
#define	_BSD_DEV_DISK_LABEL_

#include <sys/disktab.h>

#define	NLABELS		4		/* # of labels on a disk */
#define	MAXLBLLEN	24		/* dl_label[] size */
#define	NBAD		1670		/* sized to make label ~= 8KB */

/*
 *  if dl_version >= DL_V3 then the bad block table is relocated
 *  to a structure separate from the disk label.
 */
typedef union {
	unsigned short	DL_v3_checksum;
	int	DL_bad[NBAD];			/* block number that is bad */
} dl_un_t;

typedef struct disk_label {
	int		dl_version;		// label version number
	int		dl_label_blkno;		// block # where this label is
	int		dl_size;		// size of media area (sectors)
	char		dl_label[MAXLBLLEN];	// media label
	unsigned	dl_flags;		// flags (see DL_xxx, below)
	unsigned	dl_tag;			// volume tag
	struct	disktab dl_dt;			// common info in disktab
	dl_un_t		dl_un;
	unsigned short	dl_checksum;		// ones complement checksum
	
	/* add things here so dl_checksum stays in a fixed place */
} disk_label_t;

/*
 * Known label versions.
 */
#define	DL_V1		0x4e655854	/* version #1: "NeXT" */
#define	DL_V2		0x646c5632	/* version #2: "dlV2" */
#define	DL_V3		0x646c5633	/* version #3: "dlV3" */
#define	DL_VERSION	DL_V3		/* default version */


/*
 * dl_flags values
 */
#define	DL_UNINIT	0x80000000	/* label is uninitialized */

/*
 * Aliases for disktab fields
 */
#define	dl_name		dl_dt.d_name
#define	dl_type		dl_dt.d_type
#define dl_part		dl_dt.d_partitions
#define	dl_front	dl_dt.d_front
#define	dl_back		dl_dt.d_back
#define	dl_ngroups	dl_dt.d_ngroups
#define	dl_ag_size	dl_dt.d_ag_size
#define	dl_ag_alts	dl_dt.d_ag_alts
#define	dl_ag_off	dl_dt.d_ag_off
#define	dl_secsize	dl_dt.d_secsize
#define	dl_ncyl		dl_dt.d_ncylinders
#define	dl_nsect	dl_dt.d_nsectors
#define	dl_ntrack	dl_dt.d_ntracks
#define	dl_rpm		dl_dt.d_rpm
#define	dl_bootfile	dl_dt.d_bootfile
#define	dl_boot0_blkno	dl_dt.d_boot0_blkno
#define	dl_hostname	dl_dt.d_hostname
#define	dl_rootpartition dl_dt.d_rootpartition
#define	dl_rwpartition	dl_dt.d_rwpartition

/*
 * Other aliases
 */
#define	dl_v3_checksum	dl_un.DL_v3_checksum
#define	dl_bad		dl_un.DL_bad

#endif	/* _BSD_DEV_DISK_LABEL_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1991 by NeXT Computer, Inc.
	23	*
	24	* File: bsd/dev/disk_label.h - NeXT disk label definition.
	25	*
	26	* HISTORY
	27	* 28-Mar-92 Doug Mitchell at NeXT
	28	* Split out from <bsd/dev/disk.h>.
	29	*/
	30
	31	#ifndef _BSD_DEV_DISK_LABEL_
	32	#define _BSD_DEV_DISK_LABEL_
	33
	34	#include <sys/disktab.h>
	35
	36	#define NLABELS 4 /* # of labels on a disk */
	37	#define MAXLBLLEN 24 /* dl_label[] size */
	38	#define NBAD 1670 /* sized to make label ~= 8KB */
	39
	40	/*
	41	* if dl_version >= DL_V3 then the bad block table is relocated
	42	* to a structure separate from the disk label.
	43	*/
	44	typedef union {
	45	unsigned short DL_v3_checksum;
	46	int DL_bad[NBAD]; /* block number that is bad */
	47	} dl_un_t;
	48
	49	typedef struct disk_label {
	50	int dl_version; // label version number
	51	int dl_label_blkno; // block # where this label is
	52	int dl_size; // size of media area (sectors)
	53	char dl_label[MAXLBLLEN]; // media label
	54	unsigned dl_flags; // flags (see DL_xxx, below)
	55	unsigned dl_tag; // volume tag
	56	struct disktab dl_dt; // common info in disktab
	57	dl_un_t dl_un;
	58	unsigned short dl_checksum; // ones complement checksum
	59
	60	/* add things here so dl_checksum stays in a fixed place */
	61	} disk_label_t;
	62
	63	/*
	64	* Known label versions.
65	*/
66	#define DL_V1 0x4e655854 /* version #1: "NeXT" */
67	#define DL_V2 0x646c5632 /* version #2: "dlV2" */
68	#define DL_V3 0x646c5633 /* version #3: "dlV3" */
69	#define DL_VERSION DL_V3 /* default version */
70
71
72	/*
73	* dl_flags values
74	*/
75	#define DL_UNINIT 0x80000000 /* label is uninitialized */
76
77	/*
78	* Aliases for disktab fields
79	*/
80	#define dl_name dl_dt.d_name
81	#define dl_type dl_dt.d_type
82	#define dl_part dl_dt.d_partitions
83	#define dl_front dl_dt.d_front
84	#define dl_back dl_dt.d_back
85	#define dl_ngroups dl_dt.d_ngroups
86	#define dl_ag_size dl_dt.d_ag_size
87	#define dl_ag_alts dl_dt.d_ag_alts
88	#define dl_ag_off dl_dt.d_ag_off
89	#define dl_secsize dl_dt.d_secsize
90	#define dl_ncyl dl_dt.d_ncylinders
91	#define dl_nsect dl_dt.d_nsectors
92	#define dl_ntrack dl_dt.d_ntracks
93	#define dl_rpm dl_dt.d_rpm
94	#define dl_bootfile dl_dt.d_bootfile
95	#define dl_boot0_blkno dl_dt.d_boot0_blkno
96	#define dl_hostname dl_dt.d_hostname
97	#define dl_rootpartition dl_dt.d_rootpartition
98	#define dl_rwpartition dl_dt.d_rwpartition
99
100	/*
101	* Other aliases
102	*/
103	#define dl_v3_checksum dl_un.DL_v3_checksum
104	#define dl_bad dl_un.DL_bad
105
106	#endif /* _BSD_DEV_DISK_LABEL_ */
107