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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/disklabel32.h,v 1.22 2007/05/17 23:49:56 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>
50 #if defined(_KERNEL) && !defined(_SYS_CONF_H_)
51 #include <sys/conf.h> /* for make_sub_dev() */
55 * Each disk has a label which includes information about the hardware
56 * disk geometry, filesystem partitions, and drive specific information.
57 * The label is in block 0 or 1, possibly offset from the beginning
58 * to leave room for a bootstrap, etc.
61 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
63 #define LABELSECTOR 1 /* sector containing label */
64 #define LABELOFFSET 0 /* offset of label in sector */
68 #define LABELSECTOR 0 /* sector containing label */
72 #define LABELOFFSET 64 /* offset of label in sector */
75 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
77 #define MAXPARTITIONS 16
80 #define LABEL_PART 2 /* partition containing label */
81 #define RAW_PART 2 /* partition containing whole disk */
82 #define SWAP_PART 1 /* partition normally containing swap */
86 u_int32_t d_magic; /* the magic number */
87 u_int16_t d_type; /* drive type */
88 u_int16_t d_subtype; /* controller/d_type specific */
89 char d_typename[16]; /* type name, e.g. "eagle" */
92 * d_packname contains the pack identifier and is returned when
93 * the disklabel is read off the disk or in-core copy.
94 * d_boot0 and d_boot1 are the (optional) names of the
95 * primary (block 0) and secondary (block 1-15) bootstraps
96 * as found in /boot. These are returned when using
97 * getdiskbyname(3) to retrieve the values from /etc/disktab.
100 char un_d_packname[16]; /* pack identifier */
102 char *un_d_boot0; /* primary bootstrap name */
103 char *un_d_boot1; /* secondary bootstrap name */
106 #define d_packname d_un.un_d_packname
107 #define d_boot0 d_un.un_b.un_d_boot0
108 #define d_boot1 d_un.un_b.un_d_boot1
111 u_int32_t d_secsize; /* # of bytes per sector */
112 u_int32_t d_nsectors; /* # of data sectors per track */
113 u_int32_t d_ntracks; /* # of tracks per cylinder */
114 u_int32_t d_ncylinders; /* # of data cylinders per unit */
115 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
116 u_int32_t d_secperunit; /* # of data sectors per unit */
119 * Spares (bad sector replacements) below are not counted in
120 * d_nsectors or d_secpercyl. Spare sectors are assumed to
121 * be physical sectors which occupy space at the end of each
122 * track and/or cylinder.
124 u_int16_t d_sparespertrack; /* # of spare sectors per track */
125 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
127 * Alternate cylinders include maintenance, replacement, configuration
128 * description areas, etc.
130 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
132 /* hardware characteristics: */
134 * d_interleave, d_trackskew and d_cylskew describe perturbations
135 * in the media format used to compensate for a slow controller.
136 * Interleave is physical sector interleave, set up by the
137 * formatter or controller when formatting. When interleaving is
138 * in use, logically adjacent sectors are not physically
139 * contiguous, but instead are separated by some number of
140 * sectors. It is specified as the ratio of physical sectors
141 * traversed per logical sector. Thus an interleave of 1:1
142 * implies contiguous layout, while 2:1 implies that logical
143 * sector 0 is separated by one sector from logical sector 1.
144 * d_trackskew is the offset of sector 0 on track N relative to
145 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
146 * is the offset of sector 0 on cylinder N relative to sector 0
149 u_int16_t d_rpm; /* rotational speed */
150 u_int16_t d_interleave; /* hardware sector interleave */
151 u_int16_t d_trackskew; /* sector 0 skew, per track */
152 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
153 u_int32_t d_headswitch; /* head switch time, usec */
154 u_int32_t d_trkseek; /* track-to-track seek, usec */
155 u_int32_t d_flags; /* generic flags (now unused) */
157 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
159 u_int32_t d_spare[NSPARE]; /* reserved for future use */
160 u_int32_t d_magic2; /* the magic number (again) */
161 u_int16_t d_checksum; /* xor of data incl. partitions */
163 /* filesystem and partition information: */
164 u_int16_t d_npartitions; /* number of partitions in following */
165 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
166 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
167 struct partition { /* the partition table */
168 u_int32_t p_size; /* number of sectors in partition */
169 u_int32_t p_offset; /* starting sector */
170 u_int32_t p_fsize; /* filesystem basic fragment size */
171 u_int8_t p_fstype; /* filesystem type, see below */
172 u_int8_t p_frag; /* filesystem fragments per block */
174 u_int16_t cpg; /* UFS: FS cylinders per group */
175 u_int16_t sgs; /* LFS: FS segment shift */
177 #define p_cpg __partition_u1.cpg
178 #define p_sgs __partition_u1.sgs
179 } d_partitions[MAXPARTITIONS]; /* actually may be more */
182 static u_int16_t dkcksum(struct disklabel *lp);
184 static __inline u_int16_t
185 dkcksum(struct disklabel *lp)
187 u_int16_t *start, *end;
190 start = (u_int16_t *)lp;
191 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
199 * offsets for asm boot files.
207 .set d_end_,276 /* size of disk label */
211 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
212 #define DTYPE_MSCP 2 /* MSCP */
213 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
214 #define DTYPE_SCSI 4 /* SCSI */
215 #define DTYPE_ESDI 5 /* ESDI interface */
216 #define DTYPE_ST506 6 /* ST506 etc. */
217 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
218 #define DTYPE_HPFL 8 /* HP Fiber-link */
219 #define DTYPE_FLOPPY 10 /* floppy */
220 #define DTYPE_CCD 11 /* concatenated disk */
221 #define DTYPE_VINUM 12 /* vinum volume */
222 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
225 static const char *dktypenames[] = {
242 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
246 * Filesystem type and version.
247 * Used to interpret other filesystem-specific
248 * per-partition information.
250 #define FS_UNUSED 0 /* unused */
251 #define FS_SWAP 1 /* swap */
252 #define FS_V6 2 /* Sixth Edition */
253 #define FS_V7 3 /* Seventh Edition */
254 #define FS_SYSV 4 /* System V */
255 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
256 #define FS_V8 6 /* Eighth Edition, 4K blocks */
257 #define FS_BSDFFS 7 /* 4.2BSD fast file system */
258 #define FS_MSDOS 8 /* MSDOS file system */
259 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
260 #define FS_OTHER 10 /* in use, but unknown/unsupported */
261 #define FS_HPFS 11 /* OS/2 high-performance file system */
262 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
263 #define FS_BOOT 13 /* partition contains bootstrap */
264 #define FS_VINUM 14 /* Vinum drive partition */
266 #define FS_RESERVED16 16
267 #define FS_RESERVED17 17
268 #define FS_RESERVED18 18
269 #define FS_CCD 19 /* CCD drive partition */
270 #define FS_RESERVED20 20
274 static const char *fstypenames[] = {
295 "?", /* don't use in case freebsd reassigns jfs / bug in freebsd */
299 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
305 * Disk-specific ioctls.
307 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
308 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
309 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
310 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */
312 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
317 * XXX encoding of disk minor numbers, should be elsewhere.
319 * See <sys/reboot.h> for a possibly better encoding.
321 * "cpio -H newc" can be used to back up device files with large minor
322 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats
323 * don't have enough bits, and cpio and tar don't notice the lossage.
324 * There are also some sign extension bugs.
329 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
330 _________________________________________________________________
331 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
332 -----------------------------------------------------------------
333 | TYPE |UNIT_2 |P| SLICE | MAJOR? | UNIT |PART |
334 -----------------------------------------------------------------
337 #define DKMAXUNIT 0x1ff /* Highest disk unit number */
339 #define dkmakeminor(unit, slice, part) \
340 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
341 (((unit) & 0x1f) << 3) | (part & 7) | \
342 ((part & 0x08) << 17))
344 static __inline u_int
350 static __inline u_int
353 return(dkmakeminor(unit, 0, 0));
356 static __inline cdev_t
357 dkmodpart(cdev_t dev, int part)
364 val = (part & 7) | 0x100000;
365 return (make_sub_dev(dev, (minor(dev) & ~0x100007) | val));
368 static __inline cdev_t
369 dkmodslice(cdev_t dev, int slice)
371 return (make_sub_dev(dev, (minor(dev) & ~0x0f0000) | (slice << 16)));
377 return (((minor(dev) >> 17) & 0x08) | (minor(dev) & 7));
380 #define dkslice(dev) ((minor(dev) >> 16) & 0x0f)
381 #define dktype(dev) ((minor(dev) >> 25) & 0x7f)
383 static __inline u_int
386 return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f));
391 struct bio_queue_head;
393 struct bio *bounds_check_with_label (cdev_t dev, struct bio *bio,
394 struct disklabel *lp, int wlabel);
395 void diskerr (struct bio *bio, cdev_t dev, const char *what, int pri,
397 void disksort (struct buf *ap, struct buf *bp);
398 char *readdisklabel (cdev_t dev, struct disklabel *lp);
399 void bioqdisksort (struct bio_queue_head *ap, struct bio *bio);
400 int setdisklabel (struct disklabel *olp, struct disklabel *nlp,
402 int writedisklabel (cdev_t dev, struct disklabel *lp);
408 #endif /* !_SYS_DISKLABEL_H_ */