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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 1.15 2006/09/10 01:26:40 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>
55 * Disk description table, see disktab(5)
57 #define _PATH_DISKTAB "/etc/disktab"
58 #define DISKTAB "/etc/disktab" /* deprecated */
61 * Each disk has a label which includes information about the hardware
62 * disk geometry, filesystem partitions, and drive specific information.
63 * The label is in block 0 or 1, possibly offset from the beginning
64 * to leave room for a bootstrap, etc.
67 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
69 #define LABELSECTOR 1 /* sector containing label */
70 #define LABELOFFSET 0 /* offset of label in sector */
74 #define LABELSECTOR 0 /* sector containing label */
78 #define LABELOFFSET 64 /* offset of label in sector */
81 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
83 #define MAXPARTITIONS 16
86 #define LABEL_PART 2 /* partition containing label */
87 #define RAW_PART 2 /* partition containing whole disk */
88 #define SWAP_PART 1 /* partition normally containing swap */
92 u_int32_t d_magic; /* the magic number */
93 u_int16_t d_type; /* drive type */
94 u_int16_t d_subtype; /* controller/d_type specific */
95 char d_typename[16]; /* type name, e.g. "eagle" */
98 * d_packname contains the pack identifier and is returned when
99 * the disklabel is read off the disk or in-core copy.
100 * d_boot0 and d_boot1 are the (optional) names of the
101 * primary (block 0) and secondary (block 1-15) bootstraps
102 * as found in /boot. These are returned when using
103 * getdiskbyname(3) to retrieve the values from /etc/disktab.
106 char un_d_packname[16]; /* pack identifier */
108 char *un_d_boot0; /* primary bootstrap name */
109 char *un_d_boot1; /* secondary bootstrap name */
112 #define d_packname d_un.un_d_packname
113 #define d_boot0 d_un.un_b.un_d_boot0
114 #define d_boot1 d_un.un_b.un_d_boot1
117 u_int32_t d_secsize; /* # of bytes per sector */
118 u_int32_t d_nsectors; /* # of data sectors per track */
119 u_int32_t d_ntracks; /* # of tracks per cylinder */
120 u_int32_t d_ncylinders; /* # of data cylinders per unit */
121 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
122 u_int32_t d_secperunit; /* # of data sectors per unit */
125 * Spares (bad sector replacements) below are not counted in
126 * d_nsectors or d_secpercyl. Spare sectors are assumed to
127 * be physical sectors which occupy space at the end of each
128 * track and/or cylinder.
130 u_int16_t d_sparespertrack; /* # of spare sectors per track */
131 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
133 * Alternate cylinders include maintenance, replacement, configuration
134 * description areas, etc.
136 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
138 /* hardware characteristics: */
140 * d_interleave, d_trackskew and d_cylskew describe perturbations
141 * in the media format used to compensate for a slow controller.
142 * Interleave is physical sector interleave, set up by the
143 * formatter or controller when formatting. When interleaving is
144 * in use, logically adjacent sectors are not physically
145 * contiguous, but instead are separated by some number of
146 * sectors. It is specified as the ratio of physical sectors
147 * traversed per logical sector. Thus an interleave of 1:1
148 * implies contiguous layout, while 2:1 implies that logical
149 * sector 0 is separated by one sector from logical sector 1.
150 * d_trackskew is the offset of sector 0 on track N relative to
151 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
152 * is the offset of sector 0 on cylinder N relative to sector 0
155 u_int16_t d_rpm; /* rotational speed */
156 u_int16_t d_interleave; /* hardware sector interleave */
157 u_int16_t d_trackskew; /* sector 0 skew, per track */
158 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
159 u_int32_t d_headswitch; /* head switch time, usec */
160 u_int32_t d_trkseek; /* track-to-track seek, usec */
161 u_int32_t d_flags; /* generic flags */
163 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
165 u_int32_t d_spare[NSPARE]; /* reserved for future use */
166 u_int32_t d_magic2; /* the magic number (again) */
167 u_int16_t d_checksum; /* xor of data incl. partitions */
169 /* filesystem and partition information: */
170 u_int16_t d_npartitions; /* number of partitions in following */
171 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
172 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
173 struct partition { /* the partition table */
174 u_int32_t p_size; /* number of sectors in partition */
175 u_int32_t p_offset; /* starting sector */
176 u_int32_t p_fsize; /* filesystem basic fragment size */
177 u_int8_t p_fstype; /* filesystem type, see below */
178 u_int8_t p_frag; /* filesystem fragments per block */
180 u_int16_t cpg; /* UFS: FS cylinders per group */
181 u_int16_t sgs; /* LFS: FS segment shift */
183 #define p_cpg __partition_u1.cpg
184 #define p_sgs __partition_u1.sgs
185 } d_partitions[MAXPARTITIONS]; /* actually may be more */
188 static u_int16_t dkcksum(struct disklabel *lp);
190 static __inline u_int16_t
191 dkcksum(struct disklabel *lp)
193 u_int16_t *start, *end;
196 start = (u_int16_t *)lp;
197 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
205 * offsets for asm boot files.
213 .set d_end_,276 /* size of disk label */
217 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
218 #define DTYPE_MSCP 2 /* MSCP */
219 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
220 #define DTYPE_SCSI 4 /* SCSI */
221 #define DTYPE_ESDI 5 /* ESDI interface */
222 #define DTYPE_ST506 6 /* ST506 etc. */
223 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
224 #define DTYPE_HPFL 8 /* HP Fiber-link */
225 #define DTYPE_FLOPPY 10 /* floppy */
226 #define DTYPE_CCD 11 /* concatenated disk */
227 #define DTYPE_VINUM 12 /* vinum volume */
228 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
231 static const char *dktypenames[] = {
248 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
252 * Filesystem type and version.
253 * Used to interpret other filesystem-specific
254 * per-partition information.
256 #define FS_UNUSED 0 /* unused */
257 #define FS_SWAP 1 /* swap */
258 #define FS_V6 2 /* Sixth Edition */
259 #define FS_V7 3 /* Seventh Edition */
260 #define FS_SYSV 4 /* System V */
261 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
262 #define FS_V8 6 /* Eighth Edition, 4K blocks */
263 #define FS_BSDFFS 7 /* 4.2BSD fast file system */
264 #define FS_MSDOS 8 /* MSDOS file system */
265 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
266 #define FS_OTHER 10 /* in use, but unknown/unsupported */
267 #define FS_HPFS 11 /* OS/2 high-performance file system */
268 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
269 #define FS_BOOT 13 /* partition contains bootstrap */
270 #define FS_VINUM 14 /* Vinum drive */
273 static const char *fstypenames[] = {
291 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
295 * flags shared by various drives:
297 #define D_REMOVABLE 0x01 /* removable media */
298 #define D_ECC 0x02 /* supports ECC */
299 #define D_BADSECT 0x04 /* supports bad sector forw. */
300 #define D_RAMDISK 0x08 /* disk emulator */
301 #define D_CHAIN 0x10 /* can do back-back transfers */
304 * Drive data for SMD.
306 #define d_smdflags d_drivedata[0]
307 #define D_SSE 0x1 /* supports skip sectoring */
308 #define d_mindist d_drivedata[1]
309 #define d_maxdist d_drivedata[2]
310 #define d_sdist d_drivedata[3]
313 * Drive data for ST506.
315 #define d_precompcyl d_drivedata[0]
316 #define d_gap3 d_drivedata[1] /* used only when formatting */
319 * Drive data for SCSI.
321 #define d_blind d_drivedata[0]
325 * Structure used to perform a format or other raw operation, returning
326 * data and/or register values. Register identification and format
327 * are device- and driver-dependent.
331 int df_count; /* value-result */
333 int df_reg[8]; /* result */
337 * Structure used internally to retrieve information about a partition
341 struct disklabel *disklab;
342 struct partition *part;
346 * Disk-specific ioctls.
348 /* get and set disklabel; DIOCGPART used internally */
349 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
350 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
351 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
352 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
353 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */
355 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
360 * XXX encoding of disk minor numbers, should be elsewhere.
362 * See <sys/reboot.h> for a possibly better encoding.
364 * "cpio -H newc" can be used to back up device files with large minor
365 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats
366 * don't have enough bits, and cpio and tar don't notice the lossage.
367 * There are also some sign extension bugs.
372 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
373 _________________________________________________________________
374 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
375 -----------------------------------------------------------------
376 | TYPE |UNIT_2 |P| SLICE | MAJOR? | UNIT |PART |
377 -----------------------------------------------------------------
380 #define DKMAXUNIT 0x1ff /* Highest disk unit number */
382 #define dkmakeminor(unit, slice, part) \
383 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
384 (((unit) & 0x1f) << 3) | (part & 7) | \
385 ((part & 0x08) << 17))
387 static __inline u_int
393 static __inline u_int
396 return(dkmakeminor(unit, 0, 0));
399 static __inline cdev_t
400 dkmodpart(cdev_t dev, int part)
407 val = (part & 7) | 0x100000;
408 return (make_sub_dev(dev, (minor(dev) & ~0x100007) | val));
411 static __inline cdev_t
412 dkmodslice(cdev_t dev, int slice)
414 return (make_sub_dev(dev, (minor(dev) & ~0x0f0000) | (slice << 16)));
420 return (((minor(dev) >> 17) & 0x08) | (minor(dev) & 7));
423 #define dkslice(dev) ((minor(dev) >> 16) & 0x0f)
424 #define dktype(dev) ((minor(dev) >> 25) & 0x7f)
426 static __inline u_int
429 return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f));
434 struct bio_queue_head;
436 struct bio *bounds_check_with_label (cdev_t dev, struct bio *bio,
437 struct disklabel *lp, int wlabel);
438 void diskerr (struct bio *bio, cdev_t dev, const char *what, int pri,
439 int donecnt, struct disklabel *lp);
440 void disksort (struct buf *ap, struct buf *bp);
441 char *readdisklabel (cdev_t dev, struct disklabel *lp);
442 void bioqdisksort (struct bio_queue_head *ap, struct bio *bio);
443 int setdisklabel (struct disklabel *olp, struct disklabel *nlp,
445 int writedisklabel (cdev_t dev, struct disklabel *lp);
453 struct disklabel *getdiskbyname (const char *);
457 #endif /* !_SYS_DISKLABEL_H_ */