disklabel.h revision 89468
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: head/sys/sys/disklabel.h 89468 2002-01-17 18:33:18Z bde $ 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#ifdef __alpha__ 65#define LABELSECTOR 0 66#define LABELOFFSET 64 67#endif 68 69#ifdef __ia64__ 70#define LABELSECTOR 1 71#define LABELOFFSET 0 72#endif 73 74#ifndef LABELSECTOR 75#define LABELSECTOR 0 76#endif 77 78#ifndef LABELOFFSET 79#define LABELOFFSET 64 80#endif 81 82#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 83#ifndef MAXPARTITIONS 84#define MAXPARTITIONS 8 85#endif 86 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 */ 90 91#ifndef LOCORE 92struct disklabel { 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" */ 97 98 /* 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. 105 */ 106 union { 107 char un_d_packname[16]; /* pack identifier */ 108 struct { 109 char *un_d_boot0; /* primary bootstrap name */ 110 char *un_d_boot1; /* secondary bootstrap name */ 111 } un_b; 112 } d_un; 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 116 117 /* disk geometry: */ 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 */ 124 125 /* 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. 130 */ 131 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 132 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 133 /* 134 * Alternate cylinders include maintenance, replacement, configuration 135 * description areas, etc. 136 */ 137 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 138 139 /* hardware characteristics: */ 140 /* 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 0 154 * on cylinder N-1. 155 */ 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 */ 163#define NDDATA 5 164 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 165#define NSPARE 5 166 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 */ 169 170 /* 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 */ 182}; 183 184static __inline u_int16_t dkcksum __P((struct disklabel *lp)); 185static __inline u_int16_t 186dkcksum(lp) 187 struct disklabel *lp; 188{ 189 u_int16_t *start, *end; 190 u_int16_t sum = 0; 191 192 start = (u_int16_t *)lp; 193 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 194 while (start < end) 195 sum ^= *start++; 196 return (sum); 197} 198 199#else /* LOCORE */ 200 /* 201 * offsets for asm boot files. 202 */ 203 .set d_secsize,40 204 .set d_nsectors,44 205 .set d_ntracks,48 206 .set d_ncylinders,52 207 .set d_secpercyl,56 208 .set d_secperunit,60 209 .set d_end_,276 /* size of disk label */ 210#endif /* LOCORE */ 211 212/* d_type values: */ 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 */ 225 226#if defined(PC98) && !defined(PC98_ATCOMPAT) 227#define DSTYPE_SEC256 0x80 /* physical sector size=256 */ 228#endif 229 230#ifdef DKTYPENAMES 231static char *dktypenames[] = { 232 "unknown", 233 "SMD", 234 "MSCP", 235 "old DEC", 236 "SCSI", 237 "ESDI", 238 "ST506", 239 "HP-IB", 240 "HP-FL", 241 "type 9", 242 "floppy", 243 "CCD", 244 "Vinum", 245 "DOC2K", 246 NULL 247}; 248#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 249#endif 250 251/* 252 * Filesystem type and version. 253 * Used to interpret other filesystem-specific 254 * per-partition information. 255 */ 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 */ 271 272#ifdef DKTYPENAMES 273static char *fstypenames[] = { 274 "unused", 275 "swap", 276 "Version 6", 277 "Version 7", 278 "System V", 279 "4.1BSD", 280 "Eighth Edition", 281 "4.2BSD", 282 "MSDOS", 283 "4.4LFS", 284 "unknown", 285 "HPFS", 286 "ISO9660", 287 "boot", 288 "vinum", 289 NULL 290}; 291#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 292#endif 293 294/* 295 * flags shared by various drives: 296 */ 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 */ 302 303/* 304 * Drive data for SMD. 305 */ 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] 311 312/* 313 * Drive data for ST506. 314 */ 315#define d_precompcyl d_drivedata[0] 316#define d_gap3 d_drivedata[1] /* used only when formatting */ 317 318/* 319 * Drive data for SCSI. 320 */ 321#define d_blind d_drivedata[0] 322 323#ifndef LOCORE 324/* 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. 328 */ 329struct format_op { 330 char *df_buf; 331 int df_count; /* value-result */ 332 daddr_t df_startblk; 333 int df_reg[8]; /* result */ 334}; 335 336/* 337 * Structure used internally to retrieve information about a partition 338 * on a disk. 339 */ 340struct partinfo { 341 struct disklabel *disklab; 342 struct partition *part; 343}; 344 345/* DOS partition table -- located in boot block */ 346 347#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 */ 350#define DOSPARTOFF 0 351#define NDOSPART 16 352#define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 353#define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */ 354 355struct 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]; 372}; 373 374#else /* IBMPC */ 375#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 376#define DOSPARTOFF 446 377#define NDOSPART 4 378#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 */ 382 383struct 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 */ 394}; 395#endif 396 397#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 398#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 399 400/* 401 * Disk-specific ioctls. 402 */ 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 */ 409 410#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 411 412#ifdef _KERNEL 413 414/* 415 * XXX encoding of disk minor numbers, should be elsewhere. 416 * 417 * See <sys/reboot.h> for a possibly better encoding. 418 * 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. 423 */ 424 425/* 426 3 2 1 0 427 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 ----------------------------------------------------------------- 433*/ 434 435#define DKMAXUNIT 0x1ff 436 437#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) 443 444struct bio; 445struct bio_queue_head; 446 447int bounds_check_with_label __P((struct bio *bp, struct disklabel *lp, 448 int wlabel)); 449void diskerr __P((struct bio *bp, char *what, int blkdone, 450 struct disklabel *lp)); 451dev_t dkmodpart __P((dev_t dev, int part)); 452dev_t dkmodslice __P((dev_t dev, int slice)); 453u_int dkunit __P((dev_t dev)); 454char *readdisklabel __P((dev_t dev, struct disklabel *lp)); 455void bioqdisksort __P((struct bio_queue_head *ap, struct bio *bp)); 456int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 457 u_long openmask)); 458int writedisklabel __P((dev_t dev, struct disklabel *lp)); 459#ifdef __alpha__ 460struct buf; 461void alpha_fix_srm_checksum __P((struct buf *bp)); 462#endif 463 464#endif /* _KERNEL */ 465 466#endif /* LOCORE */ 467 468#ifndef _KERNEL 469__BEGIN_DECLS 470struct disklabel *getdiskbyname __P((const char *)); 471__END_DECLS 472#endif 473 474#endif /* !_SYS_DISKLABEL_H_ */ 475