FreeBSD/Linux Kernel Cross Reference
sys/sys/disklabel.h
1 /*
2 * Copyright (c) 1987, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
34 * $FreeBSD: src/sys/sys/disklabel.h,v 1.24.2.4 1999/09/05 08:22:10 peter Exp $
35 */
36
37 #ifndef _SYS_DISKLABEL_H_
38 #define _SYS_DISKLABEL_H_
39
40 #ifndef KERNEL
41 #include <sys/types.h>
42 #endif
43 #include <sys/ioccom.h>
44
45 /*
46 * Disk description table, see disktab(5)
47 */
48 #define _PATH_DISKTAB "/etc/disktab"
49 #define DISKTAB "/etc/disktab" /* deprecated */
50
51 /*
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.
56 */
57
58 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
59 #ifdef __i386__
60 #define LABELSECTOR 1 /* sector containing label */
61 #define LABELOFFSET 0 /* offset of label in sector */
62 #endif
63
64 #ifndef LABELSECTOR
65 #define LABELSECTOR 0 /* sector containing label */
66 #endif
67
68 #ifndef LABELOFFSET
69 #define LABELOFFSET 64 /* offset of label in sector */
70 #endif
71
72 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
73 #ifndef MAXPARTITIONS
74 #define MAXPARTITIONS 8
75 #endif
76
77 #define LABEL_PART 2 /* partition containing label */
78 #define RAW_PART 2 /* partition containing whole disk */
79 #define SWAP_PART 1 /* partition normally containing swap */
80
81 #ifndef LOCORE
82 struct disklabel {
83 u_int32_t d_magic; /* the magic number */
84 u_int16_t d_type; /* drive type */
85 u_int16_t d_subtype; /* controller/d_type specific */
86 char d_typename[16]; /* type name, e.g. "eagle" */
87
88 /*
89 * d_packname contains the pack identifier and is returned when
90 * the disklabel is read off the disk or in-core copy.
91 * d_boot0 and d_boot1 are the (optional) names of the
92 * primary (block 0) and secondary (block 1-15) bootstraps
93 * as found in /usr/mdec. These are returned when using
94 * getdiskbyname(3) to retrieve the values from /etc/disktab.
95 */
96 #if defined(KERNEL) || defined(STANDALONE)
97 char d_packname[16]; /* pack identifier */
98 #else
99 union {
100 char un_d_packname[16]; /* pack identifier */
101 struct {
102 char *un_d_boot0; /* primary bootstrap name */
103 char *un_d_boot1; /* secondary bootstrap name */
104 } un_b;
105 } d_un;
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
109 #endif /* ! KERNEL or STANDALONE */
110
111 /* disk geometry: */
112 u_int32_t d_secsize; /* # of bytes per sector */
113 u_int32_t d_nsectors; /* # of data sectors per track */
114 u_int32_t d_ntracks; /* # of tracks per cylinder */
115 u_int32_t d_ncylinders; /* # of data cylinders per unit */
116 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
117 u_int32_t d_secperunit; /* # of data sectors per unit */
118
119 /*
120 * Spares (bad sector replacements) below are not counted in
121 * d_nsectors or d_secpercyl. Spare sectors are assumed to
122 * be physical sectors which occupy space at the end of each
123 * track and/or cylinder.
124 */
125 u_int16_t d_sparespertrack; /* # of spare sectors per track */
126 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
127 /*
128 * Alternate cylinders include maintenance, replacement, configuration
129 * description areas, etc.
130 */
131 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
132
133 /* hardware characteristics: */
134 /*
135 * d_interleave, d_trackskew and d_cylskew describe perturbations
136 * in the media format used to compensate for a slow controller.
137 * Interleave is physical sector interleave, set up by the
138 * formatter or controller when formatting. When interleaving is
139 * in use, logically adjacent sectors are not physically
140 * contiguous, but instead are separated by some number of
141 * sectors. It is specified as the ratio of physical sectors
142 * traversed per logical sector. Thus an interleave of 1:1
143 * implies contiguous layout, while 2:1 implies that logical
144 * sector 0 is separated by one sector from logical sector 1.
145 * d_trackskew is the offset of sector 0 on track N relative to
146 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
147 * is the offset of sector 0 on cylinder N relative to sector 0
148 * on cylinder N-1.
149 */
150 u_int16_t d_rpm; /* rotational speed */
151 u_int16_t d_interleave; /* hardware sector interleave */
152 u_int16_t d_trackskew; /* sector 0 skew, per track */
153 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
154 u_int32_t d_headswitch; /* head switch time, usec */
155 u_int32_t d_trkseek; /* track-to-track seek, usec */
156 u_int32_t d_flags; /* generic flags */
157 #define NDDATA 5
158 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
159 #define NSPARE 5
160 u_int32_t d_spare[NSPARE]; /* reserved for future use */
161 u_int32_t d_magic2; /* the magic number (again) */
162 u_int16_t d_checksum; /* xor of data incl. partitions */
163
164 /* filesystem and partition information: */
165 u_int16_t d_npartitions; /* number of partitions in following */
166 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
167 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
168 struct partition { /* the partition table */
169 u_int32_t p_size; /* number of sectors in partition */
170 u_int32_t p_offset; /* starting sector */
171 u_int32_t p_fsize; /* filesystem basic fragment size */
172 u_int8_t p_fstype; /* filesystem type, see below */
173 u_int8_t p_frag; /* filesystem fragments per block */
174 union {
175 u_int16_t cpg; /* UFS: FS cylinders per group */
176 u_int16_t sgs; /* LFS: FS segment shift */
177 } __partition_u1;
178 #define p_cpg __partition_u1.cpg
179 #define p_sgs __partition_u1.sgs
180 } d_partitions[MAXPARTITIONS]; /* actually may be more */
181 };
182 #else /* LOCORE */
183 /*
184 * offsets for asm boot files.
185 */
186 .set d_secsize,40
187 .set d_nsectors,44
188 .set d_ntracks,48
189 .set d_ncylinders,52
190 .set d_secpercyl,56
191 .set d_secperunit,60
192 .set d_end_,276 /* size of disk label */
193 #endif /* LOCORE */
194
195 /* d_type values: */
196 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
197 #define DTYPE_MSCP 2 /* MSCP */
198 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
199 #define DTYPE_SCSI 4 /* SCSI */
200 #define DTYPE_ESDI 5 /* ESDI interface */
201 #define DTYPE_ST506 6 /* ST506 etc. */
202 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
203 #define DTYPE_HPFL 8 /* HP Fiber-link */
204 #define DTYPE_FLOPPY 10 /* floppy */
205 #define DTYPE_CCD 11 /* concatenated disk */
206
207 #ifdef PC98
208 #define DSTYPE_SEC256 0x80 /* physical sector size=256*/
209 #endif
210
211 #ifdef DKTYPENAMES
212 static char *dktypenames[] = {
213 "unknown",
214 "SMD",
215 "MSCP",
216 "old DEC",
217 "SCSI",
218 "ESDI",
219 "ST506",
220 "HP-IB",
221 "HP-FL",
222 "type 9",
223 "floppy",
224 "CCD",
225 NULL
226 };
227 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
228 #endif
229
230 /*
231 * Filesystem type and version.
232 * Used to interpret other filesystem-specific
233 * per-partition information.
234 */
235 #define FS_UNUSED 0 /* unused */
236 #define FS_SWAP 1 /* swap */
237 #define FS_V6 2 /* Sixth Edition */
238 #define FS_V7 3 /* Seventh Edition */
239 #define FS_SYSV 4 /* System V */
240 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
241 #define FS_V8 6 /* Eighth Edition, 4K blocks */
242 #define FS_BSDFFS 7 /* 4.2BSD fast file system */
243 #define FS_MSDOS 8 /* MSDOS file system */
244 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
245 #define FS_OTHER 10 /* in use, but unknown/unsupported */
246 #define FS_HPFS 11 /* OS/2 high-performance file system */
247 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
248 #define FS_BOOT 13 /* partition contains bootstrap */
249
250 #ifdef DKTYPENAMES
251 static char *fstypenames[] = {
252 "unused",
253 "swap",
254 "Version 6",
255 "Version 7",
256 "System V",
257 "4.1BSD",
258 "Eighth Edition",
259 "4.2BSD",
260 "MSDOS",
261 "4.4LFS",
262 "unknown",
263 "HPFS",
264 "ISO9660",
265 "boot",
266 NULL
267 };
268 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
269 #endif
270
271 /*
272 * flags shared by various drives:
273 */
274 #define D_REMOVABLE 0x01 /* removable media */
275 #define D_ECC 0x02 /* supports ECC */
276 #define D_BADSECT 0x04 /* supports bad sector forw. */
277 #define D_RAMDISK 0x08 /* disk emulator */
278 #define D_CHAIN 0x10 /* can do back-back transfers */
279
280 /*
281 * Drive data for SMD.
282 */
283 #define d_smdflags d_drivedata[0]
284 #define D_SSE 0x1 /* supports skip sectoring */
285 #define d_mindist d_drivedata[1]
286 #define d_maxdist d_drivedata[2]
287 #define d_sdist d_drivedata[3]
288
289 /*
290 * Drive data for ST506.
291 */
292 #define d_precompcyl d_drivedata[0]
293 #define d_gap3 d_drivedata[1] /* used only when formatting */
294
295 /*
296 * Drive data for SCSI.
297 */
298 #define d_blind d_drivedata[0]
299
300 #ifndef LOCORE
301 /*
302 * Structure used to perform a format or other raw operation, returning
303 * data and/or register values. Register identification and format
304 * are device- and driver-dependent.
305 */
306 struct format_op {
307 char *df_buf;
308 int df_count; /* value-result */
309 daddr_t df_startblk;
310 int df_reg[8]; /* result */
311 };
312
313 /*
314 * Structure used internally to retrieve information about a partition
315 * on a disk.
316 */
317 struct partinfo {
318 struct disklabel *disklab;
319 struct partition *part;
320 };
321
322 /* DOS partition table -- located in boot block */
323
324 #ifdef PC98
325 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
326 #define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */
327 #define DOSPARTOFF 0
328 #define NDOSPART 16
329 #define DOSPTYP_386BSD 0x94 /* 386BSD partition type */
330 #define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */
331
332 struct dos_partition {
333 unsigned char dp_mid;
334 #define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */
335 unsigned char dp_sid;
336 #define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */
337 unsigned char dp_dum1;
338 unsigned char dp_dum2;
339 unsigned char dp_ipl_sct;
340 unsigned char dp_ipl_head;
341 unsigned short dp_ipl_cyl;
342 unsigned char dp_ssect; /* starting sector */
343 unsigned char dp_shd; /* starting head */
344 unsigned short dp_scyl; /* starting cylinder */
345 unsigned char dp_esect; /* end sector */
346 unsigned char dp_ehd; /* end head */
347 unsigned short dp_ecyl; /* end cylinder */
348 unsigned char dp_name[16];
349 };
350
351 #else /* IBMPC */
352 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
353 #define DOSPARTOFF 446
354 #define NDOSPART 4
355 #define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */
356
357 struct dos_partition {
358 unsigned char dp_flag; /* bootstrap flags */
359 unsigned char dp_shd; /* starting head */
360 unsigned char dp_ssect; /* starting sector */
361 unsigned char dp_scyl; /* starting cylinder */
362 unsigned char dp_typ; /* partition type */
363 unsigned char dp_ehd; /* end head */
364 unsigned char dp_esect; /* end sector */
365 unsigned char dp_ecyl; /* end cylinder */
366 unsigned long dp_start; /* absolute starting sector number */
367 unsigned long dp_size; /* partition size in sectors */
368 };
369 #endif
370
371 #define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */
372 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
373
374 /*
375 * Disk-specific ioctls.
376 */
377 /* get and set disklabel; DIOCGPART used internally */
378 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
379 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
380 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
381 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
382
383 /* do format operation, read or write */
384 #define DIOCRFORMAT _IOWR('d', 105, struct format_op)
385 #define DIOCWFORMAT _IOWR('d', 106, struct format_op)
386
387 #define DIOCSSTEP _IOW('d', 107, int) /* set step rate */
388 #define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */
389 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
390
391 #define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */
392 #define DIOCSBADSCAN _IOW('d', 111, int) /* set badscan mode */
393
394 /*
395 * XXX encoding of disk minor numbers, should be elsewhere.
396 *
397 * See <sys/reboot.h> for a possibly better encoding.
398 *
399 * "cpio -H newc" can be used to back up device files with large minor
400 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats
401 * don't have enough bits, and cpio and tar don't notice the lossage.
402 * There are also some sign extension bugs.
403 */
404
405 /*
406 3 2 1 0
407 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
408 _________________________________________________________________
409 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
410 -----------------------------------------------------------------
411 | TYPE |UNIT_2 | SLICE | MAJOR? | UNIT |PART |
412 -----------------------------------------------------------------
413 */
414 #define dkmakeminor(unit, slice, part) \
415 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
416 (((unit) & 0x1f) << 3) | (part))
417 #define dkmodpart(dev, part) (((dev) & ~(dev_t)7) | (part))
418 #define dkmodslice(dev, slice) (((dev) & ~(dev_t)0x1f0000) | ((slice) << 16))
419 #define dkpart(dev) (minor(dev) & 7)
420 #define dkslice(dev) ((minor(dev) >> 16) & 0x1f)
421 #define dktype(dev) ((minor(dev) >> 25) & 0x7f)
422 #define dkunit(dev) ((((dev) >> 16) & 0x1e0) | (((dev) >> 3) & 0x1f))
423
424 #ifdef KERNEL
425
426 struct buf_queue_head;
427
428 int bounds_check_with_label __P((struct buf *bp, struct disklabel *lp,
429 int wlabel));
430 void diskerr __P((struct buf *bp, char *dname, char *what, int pri,
431 int blkdone, struct disklabel *lp));
432 void disksort __P((struct buf *ap, struct buf *bp));
433 u_int dkcksum __P((struct disklabel *lp));
434 char *readdisklabel __P((dev_t dev, void (*strat)(struct buf *bp),
435 struct disklabel *lp));
436 void bufqdisksort __P((struct buf_queue_head *ap, struct buf *bp));
437 int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp,
438 u_long openmask));
439 int writedisklabel __P((dev_t dev, void (*strat)(struct buf *bp),
440 struct disklabel *lp));
441
442 #endif /* KERNEL */
443
444 #endif /* LOCORE */
445
446 #ifndef KERNEL
447 __BEGIN_DECLS
448 struct disklabel *getdiskbyname __P((const char *));
449 __END_DECLS
450 #endif
451
452 #endif /* !_SYS_DISKLABEL_H_ */
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