2 * Copyright (c) 1987, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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15 * This product includes software developed by the University of
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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
79 #define LABELOFFSET 64
82 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
84 #define MAXPARTITIONS 8
87 #define LABEL_PART 2 /* partition containing label */
88 #define RAW_PART 2 /* partition containing whole disk */
89 #define SWAP_PART 1 /* partition normally containing swap */
93 u_int32_t d_magic; /* the magic number */
94 u_int16_t d_type; /* drive type */
95 u_int16_t d_subtype; /* controller/d_type specific */
96 char d_typename[16]; /* type name, e.g. "eagle" */
99 * d_packname contains the pack identifier and is returned when
100 * the disklabel is read off the disk or in-core copy.
101 * d_boot0 and d_boot1 are the (optional) names of the
102 * primary (block 0) and secondary (block 1-15) bootstraps
103 * as found in /boot. These are returned when using
104 * getdiskbyname(3) to retrieve the values from /etc/disktab.
107 char un_d_packname[16]; /* pack identifier */
109 char *un_d_boot0; /* primary bootstrap name */
110 char *un_d_boot1; /* secondary bootstrap name */
113 #define d_packname d_un.un_d_packname
114 #define d_boot0 d_un.un_b.un_d_boot0
115 #define d_boot1 d_un.un_b.un_d_boot1
118 u_int32_t d_secsize; /* # of bytes per sector */
119 u_int32_t d_nsectors; /* # of data sectors per track */
120 u_int32_t d_ntracks; /* # of tracks per cylinder */
121 u_int32_t d_ncylinders; /* # of data cylinders per unit */
122 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
123 u_int32_t d_secperunit; /* # of data sectors per unit */
126 * Spares (bad sector replacements) below are not counted in
127 * d_nsectors or d_secpercyl. Spare sectors are assumed to
128 * be physical sectors which occupy space at the end of each
129 * track and/or cylinder.
131 u_int16_t d_sparespertrack; /* # of spare sectors per track */
132 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
134 * Alternate cylinders include maintenance, replacement, configuration
135 * description areas, etc.
137 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
139 /* hardware characteristics: */
141 * d_interleave, d_trackskew and d_cylskew describe perturbations
142 * in the media format used to compensate for a slow controller.
143 * Interleave is physical sector interleave, set up by the
144 * formatter or controller when formatting. When interleaving is
145 * in use, logically adjacent sectors are not physically
146 * contiguous, but instead are separated by some number of
147 * sectors. It is specified as the ratio of physical sectors
148 * traversed per logical sector. Thus an interleave of 1:1
149 * implies contiguous layout, while 2:1 implies that logical
150 * sector 0 is separated by one sector from logical sector 1.
151 * d_trackskew is the offset of sector 0 on track N relative to
152 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
153 * is the offset of sector 0 on cylinder N relative to sector 0
156 u_int16_t d_rpm; /* rotational speed */
157 u_int16_t d_interleave; /* hardware sector interleave */
158 u_int16_t d_trackskew; /* sector 0 skew, per track */
159 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
160 u_int32_t d_headswitch; /* head switch time, usec */
161 u_int32_t d_trkseek; /* track-to-track seek, usec */
162 u_int32_t d_flags; /* generic flags */
164 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
166 u_int32_t d_spare[NSPARE]; /* reserved for future use */
167 u_int32_t d_magic2; /* the magic number (again) */
168 u_int16_t d_checksum; /* xor of data incl. partitions */
170 /* filesystem and partition information: */
171 u_int16_t d_npartitions; /* number of partitions in following */
172 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
173 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
174 struct partition { /* the partition table */
175 u_int32_t p_size; /* number of sectors in partition */
176 u_int32_t p_offset; /* starting sector */
177 u_int32_t p_fsize; /* filesystem basic fragment size */
178 u_int8_t p_fstype; /* filesystem type, see below */
179 u_int8_t p_frag; /* filesystem fragments per block */
180 u_int16_t p_cpg; /* filesystem cylinders per group */
181 } d_partitions[MAXPARTITIONS]; /* actually may be more */
184 static __inline u_int16_t dkcksum __P((struct disklabel *lp));
185 static __inline u_int16_t
187 struct disklabel *lp;
189 u_int16_t *start, *end;
192 start = (u_int16_t *)lp;
193 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
201 * offsets for asm boot files.
209 .set d_end_,276 /* size of disk label */
213 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
214 #define DTYPE_MSCP 2 /* MSCP */
215 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
216 #define DTYPE_SCSI 4 /* SCSI */
217 #define DTYPE_ESDI 5 /* ESDI interface */
218 #define DTYPE_ST506 6 /* ST506 etc. */
219 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
220 #define DTYPE_HPFL 8 /* HP Fiber-link */
221 #define DTYPE_FLOPPY 10 /* floppy */
222 #define DTYPE_CCD 11 /* concatenated disk */
223 #define DTYPE_VINUM 12 /* vinum volume */
224 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
226 #if defined(PC98) && !defined(PC98_ATCOMPAT)
227 #define DSTYPE_SEC256 0x80 /* physical sector size=256 */
231 static 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 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;
345 /* DOS partition table -- located in boot block */
347 #if defined(PC98) && !defined(PC98_ATCOMPAT)
348 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
349 #define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */
352 #define DOSPTYP_386BSD 0x94 /* 386BSD partition type */
353 #define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */
355 struct dos_partition {
356 unsigned char dp_mid;
357 #define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */
358 unsigned char dp_sid;
359 #define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */
360 unsigned char dp_dum1;
361 unsigned char dp_dum2;
362 unsigned char dp_ipl_sct;
363 unsigned char dp_ipl_head;
364 unsigned short dp_ipl_cyl;
365 unsigned char dp_ssect; /* starting sector */
366 unsigned char dp_shd; /* starting head */
367 unsigned short dp_scyl; /* starting cylinder */
368 unsigned char dp_esect; /* end sector */
369 unsigned char dp_ehd; /* end head */
370 unsigned short dp_ecyl; /* end cylinder */
371 unsigned char dp_name[16];
375 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
376 #define DOSPARTOFF 446
378 #define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */
379 #define DOSPTYP_LINSWP 0x82 /* Linux swap partition */
380 #define DOSPTYP_LINUX 0x83 /* Linux partition */
381 #define DOSPTYP_EXT 5 /* DOS extended partition */
383 struct dos_partition {
384 unsigned char dp_flag; /* bootstrap flags */
385 unsigned char dp_shd; /* starting head */
386 unsigned char dp_ssect; /* starting sector */
387 unsigned char dp_scyl; /* starting cylinder */
388 unsigned char dp_typ; /* partition type */
389 unsigned char dp_ehd; /* end head */
390 unsigned char dp_esect; /* end sector */
391 unsigned char dp_ecyl; /* end cylinder */
392 u_int32_t dp_start; /* absolute starting sector number */
393 u_int32_t dp_size; /* partition size in sectors */
397 #define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */
398 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
401 * Disk-specific ioctls.
403 /* get and set disklabel; DIOCGPART used internally */
404 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
405 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
406 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
407 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
408 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel)/* get virgin label */
410 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
415 * XXX encoding of disk minor numbers, should be elsewhere.
417 * See <sys/reboot.h> for a possibly better encoding.
419 * "cpio -H newc" can be used to back up device files with large minor
420 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats
421 * don't have enough bits, and cpio and tar don't notice the lossage.
422 * There are also some sign extension bugs.
427 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
428 _________________________________________________________________
429 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
430 -----------------------------------------------------------------
431 | SPARE |UNIT_2 | SLICE | MAJOR? | UNIT |PART |
432 -----------------------------------------------------------------
435 #define DKMAXUNIT 0x1ff
437 #define dkmakeminor(unit, slice, part) \
438 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
439 (((unit) & 0x1f) << 3) | (part))
440 #define dkpart(dev) (minor(dev) & 7)
441 #define dkslice(dev) ((minor(dev) >> 16) & 0x1f)
442 #define dksparebits(dev) ((minor(dev) >> 25) & 0x7f)
445 struct bio_queue_head;
447 int bounds_check_with_label __P((struct bio *bp, struct disklabel *lp,
449 void diskerr __P((struct bio *bp, char *what, int blkdone,
450 struct disklabel *lp));
451 dev_t dkmodpart __P((dev_t dev, int part));
452 dev_t dkmodslice __P((dev_t dev, int slice));
453 u_int dkunit __P((dev_t dev));
454 char *readdisklabel __P((dev_t dev, struct disklabel *lp));
455 void bioqdisksort __P((struct bio_queue_head *ap, struct bio *bp));
456 int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp,
458 int writedisklabel __P((dev_t dev, struct disklabel *lp));
461 void alpha_fix_srm_checksum __P((struct buf *bp));
470 struct disklabel *getdiskbyname __P((const char *));
474 #endif /* !_SYS_DISKLABEL_H_ */