disklabel.h revision 18429
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 * $Id: disklabel.h,v 1.22 1996/06/14 11:02:27 asami Exp $ 35 */ 36 37#ifndef _SYS_DISKLABEL_H_ 38#define _SYS_DISKLABEL_H_ 39 40#include <sys/ioccom.h> 41 42/* 43 * Disk description table, see disktab(5) 44 */ 45#define _PATH_DISKTAB "/etc/disktab" 46#define DISKTAB "/etc/disktab" /* deprecated */ 47 48/* 49 * Each disk has a label which includes information about the hardware 50 * disk geometry, filesystem partitions, and drive specific information. 51 * The label is in block 0 or 1, possibly offset from the beginning 52 * to leave room for a bootstrap, etc. 53 */ 54 55/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 56#ifdef __i386__ 57#define LABELSECTOR 1 /* sector containing label */ 58#define LABELOFFSET 0 /* offset of label in sector */ 59#endif 60 61#ifndef LABELSECTOR 62#define LABELSECTOR 0 /* sector containing label */ 63#endif 64 65#ifndef LABELOFFSET 66#define LABELOFFSET 64 /* offset of label in sector */ 67#endif 68 69#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 70#ifndef MAXPARTITIONS 71#define MAXPARTITIONS 8 72#endif 73 74#define LABEL_PART 2 /* partition containing label */ 75#define RAW_PART 2 /* partition containing whole disk */ 76#define SWAP_PART 1 /* partition normally containing swap */ 77 78#ifndef LOCORE 79struct disklabel { 80 u_int32_t d_magic; /* the magic number */ 81 u_int16_t d_type; /* drive type */ 82 u_int16_t d_subtype; /* controller/d_type specific */ 83 char d_typename[16]; /* type name, e.g. "eagle" */ 84 85 /* 86 * d_packname contains the pack identifier and is returned when 87 * the disklabel is read off the disk or in-core copy. 88 * d_boot0 and d_boot1 are the (optional) names of the 89 * primary (block 0) and secondary (block 1-15) bootstraps 90 * as found in /usr/mdec. These are returned when using 91 * getdiskbyname(3) to retrieve the values from /etc/disktab. 92 */ 93#if defined(KERNEL) || defined(STANDALONE) 94 char d_packname[16]; /* pack identifier */ 95#else 96 union { 97 char un_d_packname[16]; /* pack identifier */ 98 struct { 99 char *un_d_boot0; /* primary bootstrap name */ 100 char *un_d_boot1; /* secondary bootstrap name */ 101 } un_b; 102 } d_un; 103#define d_packname d_un.un_d_packname 104#define d_boot0 d_un.un_b.un_d_boot0 105#define d_boot1 d_un.un_b.un_d_boot1 106#endif /* ! KERNEL or STANDALONE */ 107 108 /* disk geometry: */ 109 u_int32_t d_secsize; /* # of bytes per sector */ 110 u_int32_t d_nsectors; /* # of data sectors per track */ 111 u_int32_t d_ntracks; /* # of tracks per cylinder */ 112 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 113 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 114 u_int32_t d_secperunit; /* # of data sectors per unit */ 115 116 /* 117 * Spares (bad sector replacements) below are not counted in 118 * d_nsectors or d_secpercyl. Spare sectors are assumed to 119 * be physical sectors which occupy space at the end of each 120 * track and/or cylinder. 121 */ 122 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 123 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 124 /* 125 * Alternate cylinders include maintenance, replacement, configuration 126 * description areas, etc. 127 */ 128 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 129 130 /* hardware characteristics: */ 131 /* 132 * d_interleave, d_trackskew and d_cylskew describe perturbations 133 * in the media format used to compensate for a slow controller. 134 * Interleave is physical sector interleave, set up by the 135 * formatter or controller when formatting. When interleaving is 136 * in use, logically adjacent sectors are not physically 137 * contiguous, but instead are separated by some number of 138 * sectors. It is specified as the ratio of physical sectors 139 * traversed per logical sector. Thus an interleave of 1:1 140 * implies contiguous layout, while 2:1 implies that logical 141 * sector 0 is separated by one sector from logical sector 1. 142 * d_trackskew is the offset of sector 0 on track N relative to 143 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 144 * is the offset of sector 0 on cylinder N relative to sector 0 145 * on cylinder N-1. 146 */ 147 u_int16_t d_rpm; /* rotational speed */ 148 u_int16_t d_interleave; /* hardware sector interleave */ 149 u_int16_t d_trackskew; /* sector 0 skew, per track */ 150 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 151 u_int32_t d_headswitch; /* head switch time, usec */ 152 u_int32_t d_trkseek; /* track-to-track seek, usec */ 153 u_int32_t d_flags; /* generic flags */ 154#define NDDATA 5 155 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 156#define NSPARE 5 157 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 158 u_int32_t d_magic2; /* the magic number (again) */ 159 u_int16_t d_checksum; /* xor of data incl. partitions */ 160 161 /* filesystem and partition information: */ 162 u_int16_t d_npartitions; /* number of partitions in following */ 163 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 164 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 165 struct partition { /* the partition table */ 166 u_int32_t p_size; /* number of sectors in partition */ 167 u_int32_t p_offset; /* starting sector */ 168 u_int32_t p_fsize; /* filesystem basic fragment size */ 169 u_int8_t p_fstype; /* filesystem type, see below */ 170 u_int8_t p_frag; /* filesystem fragments per block */ 171 union { 172 u_int16_t cpg; /* UFS: FS cylinders per group */ 173 u_int16_t sgs; /* LFS: FS segment shift */ 174 } __partition_u1; 175#define p_cpg __partition_u1.cpg 176#define p_sgs __partition_u1.sgs 177 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 178}; 179#else /* LOCORE */ 180 /* 181 * offsets for asm boot files. 182 */ 183 .set d_secsize,40 184 .set d_nsectors,44 185 .set d_ntracks,48 186 .set d_ncylinders,52 187 .set d_secpercyl,56 188 .set d_secperunit,60 189 .set d_end_,276 /* size of disk label */ 190#endif /* LOCORE */ 191 192/* d_type values: */ 193#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 194#define DTYPE_MSCP 2 /* MSCP */ 195#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 196#define DTYPE_SCSI 4 /* SCSI */ 197#define DTYPE_ESDI 5 /* ESDI interface */ 198#define DTYPE_ST506 6 /* ST506 etc. */ 199#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 200#define DTYPE_HPFL 8 /* HP Fiber-link */ 201#define DTYPE_FLOPPY 10 /* floppy */ 202#define DTYPE_CCD 11 /* concatenated disk */ 203 204#ifdef PC98 205#define DSTYPE_SEC256 0x80 /* physical sector size=256*/ 206#endif 207 208#ifdef DKTYPENAMES 209static char *dktypenames[] = { 210 "unknown", 211 "SMD", 212 "MSCP", 213 "old DEC", 214 "SCSI", 215 "ESDI", 216 "ST506", 217 "HP-IB", 218 "HP-FL", 219 "type 9", 220 "floppy", 221 "CCD", 222 NULL 223}; 224#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 225#endif 226 227/* 228 * Filesystem type and version. 229 * Used to interpret other filesystem-specific 230 * per-partition information. 231 */ 232#define FS_UNUSED 0 /* unused */ 233#define FS_SWAP 1 /* swap */ 234#define FS_V6 2 /* Sixth Edition */ 235#define FS_V7 3 /* Seventh Edition */ 236#define FS_SYSV 4 /* System V */ 237#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 238#define FS_V8 6 /* Eighth Edition, 4K blocks */ 239#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 240#define FS_MSDOS 8 /* MSDOS file system */ 241#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 242#define FS_OTHER 10 /* in use, but unknown/unsupported */ 243#define FS_HPFS 11 /* OS/2 high-performance file system */ 244#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 245#define FS_BOOT 13 /* partition contains bootstrap */ 246 247#ifdef DKTYPENAMES 248static char *fstypenames[] = { 249 "unused", 250 "swap", 251 "Version 6", 252 "Version 7", 253 "System V", 254 "4.1BSD", 255 "Eighth Edition", 256 "4.2BSD", 257 "MSDOS", 258 "4.4LFS", 259 "unknown", 260 "HPFS", 261 "ISO9660", 262 "boot", 263 NULL 264}; 265#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 266#endif 267 268/* 269 * flags shared by various drives: 270 */ 271#define D_REMOVABLE 0x01 /* removable media */ 272#define D_ECC 0x02 /* supports ECC */ 273#define D_BADSECT 0x04 /* supports bad sector forw. */ 274#define D_RAMDISK 0x08 /* disk emulator */ 275#define D_CHAIN 0x10 /* can do back-back transfers */ 276 277/* 278 * Drive data for SMD. 279 */ 280#define d_smdflags d_drivedata[0] 281#define D_SSE 0x1 /* supports skip sectoring */ 282#define d_mindist d_drivedata[1] 283#define d_maxdist d_drivedata[2] 284#define d_sdist d_drivedata[3] 285 286/* 287 * Drive data for ST506. 288 */ 289#define d_precompcyl d_drivedata[0] 290#define d_gap3 d_drivedata[1] /* used only when formatting */ 291 292/* 293 * Drive data for SCSI. 294 */ 295#define d_blind d_drivedata[0] 296 297#ifndef LOCORE 298/* 299 * Structure used to perform a format or other raw operation, returning 300 * data and/or register values. Register identification and format 301 * are device- and driver-dependent. 302 */ 303struct format_op { 304 char *df_buf; 305 int df_count; /* value-result */ 306 daddr_t df_startblk; 307 int df_reg[8]; /* result */ 308}; 309 310/* 311 * Structure used internally to retrieve information about a partition 312 * on a disk. 313 */ 314struct partinfo { 315 struct disklabel *disklab; 316 struct partition *part; 317}; 318 319/* DOS partition table -- located in boot block */ 320 321#ifdef PC98 322#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 323#define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */ 324#define DOSPARTOFF 0 325#define NDOSPART 16 326#define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 327#define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */ 328 329struct dos_partition { 330 unsigned char dp_mid; 331#define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */ 332 unsigned char dp_sid; 333#define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */ 334 unsigned char dp_dum1; 335 unsigned char dp_dum2; 336 unsigned char dp_ipl_sct; 337 unsigned char dp_ipl_head; 338 unsigned short dp_ipl_cyl; 339 unsigned char dp_ssect; /* starting sector */ 340 unsigned char dp_shd; /* starting head */ 341 unsigned short dp_scyl; /* starting cylinder */ 342 unsigned char dp_esect; /* end sector */ 343 unsigned char dp_ehd; /* end head */ 344 unsigned short dp_ecyl; /* end cylinder */ 345 unsigned char dp_name[16]; 346}; 347 348#else /* IBMPC */ 349#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 350#define DOSPARTOFF 446 351#define NDOSPART 4 352#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 353 354struct dos_partition { 355 unsigned char dp_flag; /* bootstrap flags */ 356 unsigned char dp_shd; /* starting head */ 357 unsigned char dp_ssect; /* starting sector */ 358 unsigned char dp_scyl; /* starting cylinder */ 359 unsigned char dp_typ; /* partition type */ 360 unsigned char dp_ehd; /* end head */ 361 unsigned char dp_esect; /* end sector */ 362 unsigned char dp_ecyl; /* end cylinder */ 363 unsigned long dp_start; /* absolute starting sector number */ 364 unsigned long dp_size; /* partition size in sectors */ 365}; 366#endif 367 368#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 369#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 370 371/* 372 * Disk-specific ioctls. 373 */ 374 /* get and set disklabel; DIOCGPART used internally */ 375#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 376#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 377#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 378#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 379 380/* do format operation, read or write */ 381#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 382#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 383 384#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 385#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 386#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 387 388#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 389#define DIOCSBADSCAN _IOW('d', 111, int) /* set badscan mode */ 390 391/* 392 * XXX encoding of disk minor numbers, should be elsewhere. 393 * 394 * See <sys/reboot.h> for a possibly better encoding. 395 * 396 * "cpio -H newc" can be used to back up device files with large minor 397 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 398 * don't have enough bits, and cpio and tar don't notice the lossage. 399 * There are also some sign extension bugs. 400 */ 401 402/* 403 3 2 1 0 404 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 0 405 _________________________________________________________________ 406 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 407 ----------------------------------------------------------------- 408 | TYPE | SLICE | MAJOR? | UNIT |PART | 409 ----------------------------------------------------------------- 410 | TYPE |PART2| SLICE | MAJOR? | UNIT |PART | <-soon 411 ----------------------------------------------------------------- 412 413 I want 3 more part bits (taken from 'TYPE' (useless as it is) (JRE) 414*/ 415#define dkmakeminor(unit, slice, part) \ 416 (((slice) << 16) | ((unit) << 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) >> 21) & 0x7ff) 422#define dkunit(dev) ((minor(dev) >> 3) & 0x1f) 423 424#ifdef KERNEL 425 426struct buf_queue_head; 427 428int bounds_check_with_label __P((struct buf *bp, struct disklabel *lp, 429 int wlabel)); 430void diskerr __P((struct buf *bp, char *dname, char *what, int pri, 431 int blkdone, struct disklabel *lp)); 432void disksort __P((struct buf *ap, struct buf *bp)); 433u_int dkcksum __P((struct disklabel *lp)); 434char *readdisklabel __P((dev_t dev, void (*strat)(struct buf *bp), 435 struct disklabel *lp)); 436void tqdisksort __P((struct buf_queue_head *ap, struct buf *bp)); 437int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 438 u_long openmask)); 439int writedisklabel __P((dev_t dev, void (*strat)(struct buf *bp), 440 struct disklabel *lp)); 441 442#endif /* KERNEL */ 443 444#endif /* LOCORE */ 445 446#if !defined(KERNEL) && !defined(LOCORE) 447 448#include <sys/cdefs.h> 449 450__BEGIN_DECLS 451struct disklabel *getdiskbyname __P((const char *)); 452__END_DECLS 453 454#endif 455 456#endif /* !_SYS_DISKLABEL_H_ */ 457