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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 1.24 2007/05/20 23:21:36 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 */
183 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
184 #define DTYPE_MSCP 2 /* MSCP */
185 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
186 #define DTYPE_SCSI 4 /* SCSI */
187 #define DTYPE_ESDI 5 /* ESDI interface */
188 #define DTYPE_ST506 6 /* ST506 etc. */
189 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
190 #define DTYPE_HPFL 8 /* HP Fiber-link */
191 #define DTYPE_FLOPPY 10 /* floppy */
192 #define DTYPE_CCD 11 /* concatenated disk */
193 #define DTYPE_VINUM 12 /* vinum volume */
194 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
197 static const char *dktypenames[] = {
214 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
218 * Filesystem type and version.
219 * Used to interpret other filesystem-specific
220 * per-partition information.
222 #define FS_UNUSED 0 /* unused */
223 #define FS_SWAP 1 /* swap */
224 #define FS_V6 2 /* Sixth Edition */
225 #define FS_V7 3 /* Seventh Edition */
226 #define FS_SYSV 4 /* System V */
227 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
228 #define FS_V8 6 /* Eighth Edition, 4K blocks */
229 #define FS_BSDFFS 7 /* 4.2BSD fast file system */
230 #define FS_MSDOS 8 /* MSDOS file system */
231 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
232 #define FS_OTHER 10 /* in use, but unknown/unsupported */
233 #define FS_HPFS 11 /* OS/2 high-performance file system */
234 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
235 #define FS_BOOT 13 /* partition contains bootstrap */
236 #define FS_VINUM 14 /* Vinum drive partition */
238 #define FS_RESERVED16 16
239 #define FS_RESERVED17 17
240 #define FS_RESERVED18 18
241 #define FS_CCD 19 /* CCD drive partition */
242 #define FS_RESERVED20 20
246 static const char *fstypenames[] = {
267 "?", /* don't use in case freebsd reassigns jfs / bug in freebsd */
271 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
277 * Disk-specific ioctls.
279 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
280 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
281 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
282 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */
286 char *readdisklabel (cdev_t dev, struct disklabel *lp);
287 int setdisklabel (struct disklabel *olp, struct disklabel *nlp,
289 int writedisklabel (cdev_t dev, struct disklabel *lp);
295 #endif /* !_SYS_DISKLABEL_H_ */