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33 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
34 * $FreeBSD: src/sys/sys/disklabel.h,v 1.49.2.7 2001/05/27 05:58:26 jkh Exp $
35 * $DragonFly: src/sys/sys/disklabel.h,v 1.26 2007/06/17 23:50:12 dillon Exp $
38 #ifndef _SYS_DISKLABEL_H_
39 #define _SYS_DISKLABEL_H_
42 #include <sys/types.h>
44 #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_)
45 #include <sys/systm.h>
47 #ifndef _SYS_IOCCOM_H_
48 #include <sys/ioccom.h>
52 * Each disk has a label which includes information about the hardware
53 * disk geometry, filesystem partitions, and drive specific information.
54 * The label is in block 0 or 1, possibly offset from the beginning
55 * to leave room for a bootstrap, etc.
58 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
60 #define LABELSECTOR 1 /* sector containing label */
61 #define LABELOFFSET 0 /* offset of label in sector */
64 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
66 #define MAXPARTITIONS 16
69 #define LABEL_PART 2 /* partition containing label */
70 #define RAW_PART 2 /* partition containing whole disk */
71 #define SWAP_PART 1 /* partition normally containing swap */
75 u_int32_t d_magic
; /* the magic number */
76 u_int16_t d_type
; /* drive type */
77 u_int16_t d_subtype
; /* controller/d_type specific */
78 char d_typename
[16]; /* type name, e.g. "eagle" */
80 char d_packname
[16]; /* pack identifier */
83 u_int32_t d_secsize
; /* # of bytes per sector */
84 u_int32_t d_nsectors
; /* # of data sectors per track */
85 u_int32_t d_ntracks
; /* # of tracks per cylinder */
86 u_int32_t d_ncylinders
; /* # of data cylinders per unit */
87 u_int32_t d_secpercyl
; /* # of data sectors per cylinder */
88 u_int32_t d_secperunit
; /* # of data sectors per unit */
91 * Spares (bad sector replacements) below are not counted in
92 * d_nsectors or d_secpercyl. Spare sectors are assumed to
93 * be physical sectors which occupy space at the end of each
94 * track and/or cylinder.
96 u_int16_t d_sparespertrack
; /* # of spare sectors per track */
97 u_int16_t d_sparespercyl
; /* # of spare sectors per cylinder */
99 * Alternate cylinders include maintenance, replacement, configuration
100 * description areas, etc.
102 u_int32_t d_acylinders
; /* # of alt. cylinders per unit */
104 /* hardware characteristics: */
106 * d_interleave, d_trackskew and d_cylskew describe perturbations
107 * in the media format used to compensate for a slow controller.
108 * Interleave is physical sector interleave, set up by the
109 * formatter or controller when formatting. When interleaving is
110 * in use, logically adjacent sectors are not physically
111 * contiguous, but instead are separated by some number of
112 * sectors. It is specified as the ratio of physical sectors
113 * traversed per logical sector. Thus an interleave of 1:1
114 * implies contiguous layout, while 2:1 implies that logical
115 * sector 0 is separated by one sector from logical sector 1.
116 * d_trackskew is the offset of sector 0 on track N relative to
117 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
118 * is the offset of sector 0 on cylinder N relative to sector 0
121 u_int16_t d_rpm
; /* rotational speed */
122 u_int16_t d_interleave
; /* hardware sector interleave */
123 u_int16_t d_trackskew
; /* sector 0 skew, per track */
124 u_int16_t d_cylskew
; /* sector 0 skew, per cylinder */
125 u_int32_t d_headswitch
; /* head switch time, usec */
126 u_int32_t d_trkseek
; /* track-to-track seek, usec */
127 u_int32_t d_flags
; /* generic flags (now unused) */
129 u_int32_t d_drivedata
[NDDATA
]; /* drive-type specific information */
131 u_int32_t d_spare
[NSPARE
]; /* reserved for future use */
132 u_int32_t d_magic2
; /* the magic number (again) */
133 u_int16_t d_checksum
; /* xor of data incl. partitions */
135 /* filesystem and partition information: */
136 u_int16_t d_npartitions
; /* number of partitions in following */
137 u_int32_t d_bbsize
; /* size of boot area at sn0, bytes */
138 u_int32_t d_sbsize
; /* max size of fs superblock, bytes */
139 struct partition
{ /* the partition table */
140 u_int32_t p_size
; /* number of sectors in partition */
141 u_int32_t p_offset
; /* starting sector */
142 u_int32_t p_fsize
; /* filesystem basic fragment size */
143 u_int8_t p_fstype
; /* filesystem type, see below */
144 u_int8_t p_frag
; /* filesystem fragments per block */
146 u_int16_t cpg
; /* UFS: FS cylinders per group */
147 u_int16_t sgs
; /* LFS: FS segment shift */
149 #define p_cpg __partition_u1.cpg
150 #define p_sgs __partition_u1.sgs
151 } d_partitions
[MAXPARTITIONS
]; /* actually may be more */
154 static u_int16_t
dkcksum(struct disklabel
*lp
);
156 static __inline u_int16_t
157 dkcksum(struct disklabel
*lp
)
159 u_int16_t
*start
, *end
;
162 start
= (u_int16_t
*)lp
;
163 end
= (u_int16_t
*)&lp
->d_partitions
[lp
->d_npartitions
];
171 * offsets for asm boot files.
179 .set d_end_
,276 /* size of disk label */
185 * Disk-specific ioctls.
187 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
188 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
189 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
190 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */
198 char *readdisklabel (cdev_t dev
, struct disklabel
*lp
);
199 int setdisklabel (struct disklabel
*olp
, struct disklabel
*nlp
,
200 struct diskslice
*sp
, u_int32_t
*openmask
);
201 int writedisklabel (cdev_t dev
, struct disklabel
*lp
);
202 struct disklabel
*clone_label(struct disk_info
*info
, struct diskslice
*sp
);
203 char *fixlabel(const char *sname
, struct diskslice
*sp
,
204 struct disklabel
*lp
, int writeflag
);
205 void adjust_label_reserved(struct diskslices
*ssp
, int slice
, struct diskslice
*sp
);
206 int getpartbounds(struct disklabel
*lp
, u_int32_t part
,
207 u_int64_t
*start
, u_int64_t
*blocks
);
208 int getpartfstype(struct disklabel
*lp
, u_int32_t part
);
209 u_int32_t
getnumparts(struct disklabel
*lp
);
210 void makevirginlabel(struct disklabel
*lp
, struct diskslices
*ssp
,
211 struct diskslice
*sp
, struct disk_info
*info
);
217 #endif /* !_SYS_DISKLABEL_H_ */