2 * Copyright (c) 1987, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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33 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
37 #ifndef _SYS_DISKLABEL_H_
38 #define _SYS_DISKLABEL_H_
41 #include <sys/types.h>
43 #include <sys/ioccom.h>
46 * Disk description table, see disktab(5)
48 #define _PATH_DISKTAB "/etc/disktab"
49 #define DISKTAB "/etc/disktab" /* deprecated */
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 */
66 #define LABELOFFSET 64
70 #define LABELSECTOR 0 /* sector containing label */
74 #define LABELOFFSET 64 /* offset of label in sector */
77 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
79 #define MAXPARTITIONS 8
82 #define LABEL_PART 2 /* partition containing label */
83 #define RAW_PART 2 /* partition containing whole disk */
84 #define SWAP_PART 1 /* partition normally containing swap */
88 u_int32_t d_magic; /* the magic number */
89 u_int16_t d_type; /* drive type */
90 u_int16_t d_subtype; /* controller/d_type specific */
91 char d_typename[16]; /* type name, e.g. "eagle" */
94 * d_packname contains the pack identifier and is returned when
95 * the disklabel is read off the disk or in-core copy.
96 * d_boot0 and d_boot1 are the (optional) names of the
97 * primary (block 0) and secondary (block 1-15) bootstraps
98 * as found in /boot. These are returned when using
99 * getdiskbyname(3) to retrieve the values from /etc/disktab.
102 char un_d_packname[16]; /* pack identifier */
104 char *un_d_boot0; /* primary bootstrap name */
105 char *un_d_boot1; /* secondary bootstrap name */
108 #define d_packname d_un.un_d_packname
109 #define d_boot0 d_un.un_b.un_d_boot0
110 #define d_boot1 d_un.un_b.un_d_boot1
113 u_int32_t d_secsize; /* # of bytes per sector */
114 u_int32_t d_nsectors; /* # of data sectors per track */
115 u_int32_t d_ntracks; /* # of tracks per cylinder */
116 u_int32_t d_ncylinders; /* # of data cylinders per unit */
117 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
118 u_int32_t d_secperunit; /* # of data sectors per unit */
121 * Spares (bad sector replacements) below are not counted in
122 * d_nsectors or d_secpercyl. Spare sectors are assumed to
123 * be physical sectors which occupy space at the end of each
124 * track and/or cylinder.
126 u_int16_t d_sparespertrack; /* # of spare sectors per track */
127 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
129 * Alternate cylinders include maintenance, replacement, configuration
130 * description areas, etc.
132 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
134 /* hardware characteristics: */
136 * d_interleave, d_trackskew and d_cylskew describe perturbations
137 * in the media format used to compensate for a slow controller.
138 * Interleave is physical sector interleave, set up by the
139 * formatter or controller when formatting. When interleaving is
140 * in use, logically adjacent sectors are not physically
141 * contiguous, but instead are separated by some number of
142 * sectors. It is specified as the ratio of physical sectors
143 * traversed per logical sector. Thus an interleave of 1:1
144 * implies contiguous layout, while 2:1 implies that logical
145 * sector 0 is separated by one sector from logical sector 1.
146 * d_trackskew is the offset of sector 0 on track N relative to
147 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
148 * is the offset of sector 0 on cylinder N relative to sector 0
151 u_int16_t d_rpm; /* rotational speed */
152 u_int16_t d_interleave; /* hardware sector interleave */
153 u_int16_t d_trackskew; /* sector 0 skew, per track */
154 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
155 u_int32_t d_headswitch; /* head switch time, usec */
156 u_int32_t d_trkseek; /* track-to-track seek, usec */
157 u_int32_t d_flags; /* generic flags */
159 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
161 u_int32_t d_spare[NSPARE]; /* reserved for future use */
162 u_int32_t d_magic2; /* the magic number (again) */
163 u_int16_t d_checksum; /* xor of data incl. partitions */
165 /* filesystem and partition information: */
166 u_int16_t d_npartitions; /* number of partitions in following */
167 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
168 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
169 struct partition { /* the partition table */
170 u_int32_t p_size; /* number of sectors in partition */
171 u_int32_t p_offset; /* starting sector */
172 u_int32_t p_fsize; /* filesystem basic fragment size */
173 u_int8_t p_fstype; /* filesystem type, see below */
174 u_int8_t p_frag; /* filesystem fragments per block */
175 u_int16_t p_cpg; /* filesystem cylinders per group */
176 } d_partitions[MAXPARTITIONS]; /* actually may be more */
179 static u_int16_t dkcksum(struct disklabel *lp);
181 static __inline u_int16_t
182 dkcksum(struct disklabel *lp)
184 u_int16_t *start, *end;
187 start = (u_int16_t *)lp;
188 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
196 * offsets for asm boot files.
204 .set d_end_,276 /* size of disk label */
208 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
209 #define DTYPE_MSCP 2 /* MSCP */
210 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
211 #define DTYPE_SCSI 4 /* SCSI */
212 #define DTYPE_ESDI 5 /* ESDI interface */
213 #define DTYPE_ST506 6 /* ST506 etc. */
214 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
215 #define DTYPE_HPFL 8 /* HP Fiber-link */
216 #define DTYPE_FLOPPY 10 /* floppy */
217 #define DTYPE_CCD 11 /* concatenated disk */
218 #define DTYPE_VINUM 12 /* vinum volume */
219 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
221 #if defined(PC98) && !defined(PC98_ATCOMPAT)
222 #define DSTYPE_SEC256 0x80 /* physical sector size=256 */
226 static char *dktypenames[] = {
243 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
247 * Filesystem type and version.
248 * Used to interpret other filesystem-specific
249 * per-partition information.
251 #define FS_UNUSED 0 /* unused */
252 #define FS_SWAP 1 /* swap */
253 #define FS_V6 2 /* Sixth Edition */
254 #define FS_V7 3 /* Seventh Edition */
255 #define FS_SYSV 4 /* System V */
256 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
257 #define FS_V8 6 /* Eighth Edition, 4K blocks */
258 #define FS_BSDFFS 7 /* 4.2BSD fast file system */
259 #define FS_MSDOS 8 /* MSDOS file system */
260 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
261 #define FS_OTHER 10 /* in use, but unknown/unsupported */
262 #define FS_HPFS 11 /* OS/2 high-performance file system */
263 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
264 #define FS_BOOT 13 /* partition contains bootstrap */
265 #define FS_VINUM 14 /* Vinum drive */
268 static char *fstypenames[] = {
286 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
290 * flags shared by various drives:
292 #define D_REMOVABLE 0x01 /* removable media */
293 #define D_ECC 0x02 /* supports ECC */
294 #define D_BADSECT 0x04 /* supports bad sector forw. */
295 #define D_RAMDISK 0x08 /* disk emulator */
296 #define D_CHAIN 0x10 /* can do back-back transfers */
299 * Drive data for SMD.
301 #define d_smdflags d_drivedata[0]
302 #define D_SSE 0x1 /* supports skip sectoring */
303 #define d_mindist d_drivedata[1]
304 #define d_maxdist d_drivedata[2]
305 #define d_sdist d_drivedata[3]
308 * Drive data for ST506.
310 #define d_precompcyl d_drivedata[0]
311 #define d_gap3 d_drivedata[1] /* used only when formatting */
314 * Drive data for SCSI.
316 #define d_blind d_drivedata[0]
320 * Structure used to perform a format or other raw operation, returning
321 * data and/or register values. Register identification and format
322 * are device- and driver-dependent.
326 int df_count; /* value-result */
328 int df_reg[8]; /* result */
332 * Structure used internally to retrieve information about a partition
336 struct disklabel *disklab;
337 struct partition *part;
340 /* DOS partition table -- located in boot block */
342 #if defined(PC98) && !defined(PC98_ATCOMPAT)
343 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
344 #define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */
347 #define DOSPTYP_386BSD 0x94 /* 386BSD partition type */
348 #define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */
350 struct dos_partition {
351 unsigned char dp_mid;
352 #define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */
353 unsigned char dp_sid;
354 #define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */
355 unsigned char dp_dum1;
356 unsigned char dp_dum2;
357 unsigned char dp_ipl_sct;
358 unsigned char dp_ipl_head;
359 unsigned short dp_ipl_cyl;
360 unsigned char dp_ssect; /* starting sector */
361 unsigned char dp_shd; /* starting head */
362 unsigned short dp_scyl; /* starting cylinder */
363 unsigned char dp_esect; /* end sector */
364 unsigned char dp_ehd; /* end head */
365 unsigned short dp_ecyl; /* end cylinder */
366 unsigned char dp_name[16];
370 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
371 #define DOSPARTOFF 446
373 #define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */
374 #define DOSPTYP_LINSWP 0x82 /* Linux swap partition */
375 #define DOSPTYP_LINUX 0x83 /* Linux partition */
376 #define DOSPTYP_EXT 5 /* DOS extended partition */
378 struct dos_partition {
379 unsigned char dp_flag; /* bootstrap flags */
380 unsigned char dp_shd; /* starting head */
381 unsigned char dp_ssect; /* starting sector */
382 unsigned char dp_scyl; /* starting cylinder */
383 unsigned char dp_typ; /* partition type */
384 unsigned char dp_ehd; /* end head */
385 unsigned char dp_esect; /* end sector */
386 unsigned char dp_ecyl; /* end cylinder */
387 u_int32_t dp_start; /* absolute starting sector number */
388 u_int32_t dp_size; /* partition size in sectors */
392 #define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */
393 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
396 * Disk-specific ioctls.
398 /* get and set disklabel; DIOCGPART used internally */
399 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
400 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
401 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
402 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
403 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */
405 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
410 * XXX encoding of disk minor numbers, should be elsewhere.
412 * See <sys/reboot.h> for a possibly better encoding.
414 * "cpio -H newc" can be used to back up device files with large minor
415 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats
416 * don't have enough bits, and cpio and tar don't notice the lossage.
417 * There are also some sign extension bugs.
422 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
423 _________________________________________________________________
424 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
425 -----------------------------------------------------------------
426 | TYPE |UNIT_2 | SLICE | MAJOR? | UNIT |PART |
427 -----------------------------------------------------------------
430 #define DKMAXUNIT 0x1ff /* Highest disk unit number */
432 #define dkmakeminor(unit, slice, part) \
433 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
434 (((unit) & 0x1f) << 3) | (part))
435 static __inline dev_t
436 dkmodpart(dev_t dev, int part)
438 return (makedev(major(dev), (minor(dev) & ~7) | part));
441 static __inline dev_t
442 dkmodslice(dev_t dev, int slice)
444 return (makedev(major(dev), (minor(dev) & ~0x1f0000) | (slice << 16)));
447 #define dkpart(dev) (minor(dev) & 7)
448 #define dkslice(dev) ((minor(dev) >> 16) & 0x1f)
449 #define dktype(dev) ((minor(dev) >> 25) & 0x7f)
451 static __inline u_int
454 return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f));
459 struct buf_queue_head;
460 struct bio_queue_head;
462 int bounds_check_with_label __P((struct bio *bp, struct disklabel *lp,
464 void diskerr __P((struct bio *bp, char *what, int blkdone,
465 struct disklabel *lp));
466 void disksort __P((struct buf *ap, struct buf *bp));
467 char *readdisklabel __P((dev_t dev, struct disklabel *lp));
468 void bioqdisksort __P((struct bio_queue_head *ap, struct bio *bp));
469 int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp,
471 int writedisklabel __P((dev_t dev, struct disklabel *lp));
473 void alpha_fix_srm_checksum __P((struct buf *bp));
482 struct disklabel *getdiskbyname __P((const char *));
486 #endif /* !_SYS_DISKLABEL_H_ */