disklabel.h revision 93026
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 93026 2002-03-23 16:54:19Z phk $ 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#ifdef __sparc64__ 75#define LABELSECTOR 0 76#define LABELOFFSET 128 77#endif 78 79#ifndef LABELSECTOR 80#define LABELSECTOR 0 81#endif 82 83#ifndef LABELOFFSET 84#define LABELOFFSET 64 85#endif 86 87#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 88#ifndef MAXPARTITIONS 89#define MAXPARTITIONS 8 90#endif 91 92#define LABEL_PART 2 /* partition containing label */ 93#define RAW_PART 2 /* partition containing whole disk */ 94#define SWAP_PART 1 /* partition normally containing swap */ 95 96#ifndef LOCORE 97struct disklabel { 98 u_int32_t d_magic; /* the magic number */ 99 u_int16_t d_type; /* drive type */ 100 u_int16_t d_subtype; /* controller/d_type specific */ 101 char d_typename[16]; /* type name, e.g. "eagle" */ 102 103 /* 104 * d_packname contains the pack identifier and is returned when 105 * the disklabel is read off the disk or in-core copy. 106 * d_boot0 and d_boot1 are the (optional) names of the 107 * primary (block 0) and secondary (block 1-15) bootstraps 108 * as found in /boot. These are returned when using 109 * getdiskbyname(3) to retrieve the values from /etc/disktab. 110 */ 111 union { 112 char un_d_packname[16]; /* pack identifier */ 113 struct { 114 char *un_d_boot0; /* primary bootstrap name */ 115 char *un_d_boot1; /* secondary bootstrap name */ 116 } un_b; 117 } d_un; 118#define d_packname d_un.un_d_packname 119#define d_boot0 d_un.un_b.un_d_boot0 120#define d_boot1 d_un.un_b.un_d_boot1 121 122 /* disk geometry: */ 123 u_int32_t d_secsize; /* # of bytes per sector */ 124 u_int32_t d_nsectors; /* # of data sectors per track */ 125 u_int32_t d_ntracks; /* # of tracks per cylinder */ 126 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 127 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 128 u_int32_t d_secperunit; /* # of data sectors per unit */ 129 130 /* 131 * Spares (bad sector replacements) below are not counted in 132 * d_nsectors or d_secpercyl. Spare sectors are assumed to 133 * be physical sectors which occupy space at the end of each 134 * track and/or cylinder. 135 */ 136 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 137 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 138 /* 139 * Alternate cylinders include maintenance, replacement, configuration 140 * description areas, etc. 141 */ 142 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 143 144 /* hardware characteristics: */ 145 /* 146 * d_interleave, d_trackskew and d_cylskew describe perturbations 147 * in the media format used to compensate for a slow controller. 148 * Interleave is physical sector interleave, set up by the 149 * formatter or controller when formatting. When interleaving is 150 * in use, logically adjacent sectors are not physically 151 * contiguous, but instead are separated by some number of 152 * sectors. It is specified as the ratio of physical sectors 153 * traversed per logical sector. Thus an interleave of 1:1 154 * implies contiguous layout, while 2:1 implies that logical 155 * sector 0 is separated by one sector from logical sector 1. 156 * d_trackskew is the offset of sector 0 on track N relative to 157 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 158 * is the offset of sector 0 on cylinder N relative to sector 0 159 * on cylinder N-1. 160 */ 161 u_int16_t d_rpm; /* rotational speed */ 162 u_int16_t d_interleave; /* hardware sector interleave */ 163 u_int16_t d_trackskew; /* sector 0 skew, per track */ 164 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 165 u_int32_t d_headswitch; /* head switch time, usec */ 166 u_int32_t d_trkseek; /* track-to-track seek, usec */ 167 u_int32_t d_flags; /* generic flags */ 168#define NDDATA 5 169 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 170#define NSPARE 5 171 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 172 u_int32_t d_magic2; /* the magic number (again) */ 173 u_int16_t d_checksum; /* xor of data incl. partitions */ 174 175 /* filesystem and partition information: */ 176 u_int16_t d_npartitions; /* number of partitions in following */ 177 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 178 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 179 struct partition { /* the partition table */ 180 u_int32_t p_size; /* number of sectors in partition */ 181 u_int32_t p_offset; /* starting sector */ 182 u_int32_t p_fsize; /* filesystem basic fragment size */ 183 u_int8_t p_fstype; /* filesystem type, see below */ 184 u_int8_t p_frag; /* filesystem fragments per block */ 185 u_int16_t p_cpg; /* filesystem cylinders per group */ 186 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 187}; 188 189static __inline u_int16_t dkcksum(struct disklabel *lp); 190static __inline u_int16_t 191dkcksum(lp) 192 struct disklabel *lp; 193{ 194 u_int16_t *start, *end; 195 u_int16_t sum = 0; 196 197 start = (u_int16_t *)lp; 198 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 199 while (start < end) 200 sum ^= *start++; 201 return (sum); 202} 203 204#else /* LOCORE */ 205 /* 206 * offsets for asm boot files. 207 */ 208 .set d_secsize,40 209 .set d_nsectors,44 210 .set d_ntracks,48 211 .set d_ncylinders,52 212 .set d_secpercyl,56 213 .set d_secperunit,60 214 .set d_end_,276 /* size of disk label */ 215#endif /* LOCORE */ 216 217/* d_type values: */ 218#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 219#define DTYPE_MSCP 2 /* MSCP */ 220#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 221#define DTYPE_SCSI 4 /* SCSI */ 222#define DTYPE_ESDI 5 /* ESDI interface */ 223#define DTYPE_ST506 6 /* ST506 etc. */ 224#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 225#define DTYPE_HPFL 8 /* HP Fiber-link */ 226#define DTYPE_FLOPPY 10 /* floppy */ 227#define DTYPE_CCD 11 /* concatenated disk */ 228#define DTYPE_VINUM 12 /* vinum volume */ 229#define DTYPE_DOC2K 13 /* Msys DiskOnChip */ 230 231#if defined(PC98) && !defined(PC98_ATCOMPAT) 232#define DSTYPE_SEC256 0x80 /* physical sector size=256 */ 233#endif 234 235#ifdef DKTYPENAMES 236static char *dktypenames[] = { 237 "unknown", 238 "SMD", 239 "MSCP", 240 "old DEC", 241 "SCSI", 242 "ESDI", 243 "ST506", 244 "HP-IB", 245 "HP-FL", 246 "type 9", 247 "floppy", 248 "CCD", 249 "Vinum", 250 "DOC2K", 251 NULL 252}; 253#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 254#endif 255 256/* 257 * Filesystem type and version. 258 * Used to interpret other filesystem-specific 259 * per-partition information. 260 */ 261#define FS_UNUSED 0 /* unused */ 262#define FS_SWAP 1 /* swap */ 263#define FS_V6 2 /* Sixth Edition */ 264#define FS_V7 3 /* Seventh Edition */ 265#define FS_SYSV 4 /* System V */ 266#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 267#define FS_V8 6 /* Eighth Edition, 4K blocks */ 268#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 269#define FS_MSDOS 8 /* MSDOS file system */ 270#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 271#define FS_OTHER 10 /* in use, but unknown/unsupported */ 272#define FS_HPFS 11 /* OS/2 high-performance file system */ 273#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 274#define FS_BOOT 13 /* partition contains bootstrap */ 275#define FS_VINUM 14 /* Vinum drive */ 276 277#ifdef DKTYPENAMES 278static char *fstypenames[] = { 279 "unused", 280 "swap", 281 "Version 6", 282 "Version 7", 283 "System V", 284 "4.1BSD", 285 "Eighth Edition", 286 "4.2BSD", 287 "MSDOS", 288 "4.4LFS", 289 "unknown", 290 "HPFS", 291 "ISO9660", 292 "boot", 293 "vinum", 294 NULL 295}; 296#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 297#endif 298 299/* 300 * flags shared by various drives: 301 */ 302#define D_REMOVABLE 0x01 /* removable media */ 303#define D_ECC 0x02 /* supports ECC */ 304#define D_BADSECT 0x04 /* supports bad sector forw. */ 305#define D_RAMDISK 0x08 /* disk emulator */ 306#define D_CHAIN 0x10 /* can do back-back transfers */ 307 308/* 309 * Drive data for SMD. 310 */ 311#define d_smdflags d_drivedata[0] 312#define D_SSE 0x1 /* supports skip sectoring */ 313#define d_mindist d_drivedata[1] 314#define d_maxdist d_drivedata[2] 315#define d_sdist d_drivedata[3] 316 317/* 318 * Drive data for ST506. 319 */ 320#define d_precompcyl d_drivedata[0] 321#define d_gap3 d_drivedata[1] /* used only when formatting */ 322 323/* 324 * Drive data for SCSI. 325 */ 326#define d_blind d_drivedata[0] 327 328#ifndef LOCORE 329/* 330 * Structure used to perform a format or other raw operation, returning 331 * data and/or register values. Register identification and format 332 * are device- and driver-dependent. 333 */ 334struct format_op { 335 char *df_buf; 336 int df_count; /* value-result */ 337 daddr_t df_startblk; 338 int df_reg[8]; /* result */ 339}; 340 341#ifdef _KERNEL 342/* 343 * Structure used internally to retrieve information about a partition 344 * on a disk. 345 */ 346struct partinfo { 347 struct disklabel *disklab; 348 struct partition *part; 349}; 350#endif 351 352/* DOS partition table -- located in boot block */ 353 354#if defined(PC98) && !defined(PC98_ATCOMPAT) 355#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 356#define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */ 357#define DOSPARTOFF 0 358#define NDOSPART 16 359#define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 360#define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */ 361 362struct dos_partition { 363 unsigned char dp_mid; 364#define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */ 365 unsigned char dp_sid; 366#define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */ 367 unsigned char dp_dum1; 368 unsigned char dp_dum2; 369 unsigned char dp_ipl_sct; 370 unsigned char dp_ipl_head; 371 unsigned short dp_ipl_cyl; 372 unsigned char dp_ssect; /* starting sector */ 373 unsigned char dp_shd; /* starting head */ 374 unsigned short dp_scyl; /* starting cylinder */ 375 unsigned char dp_esect; /* end sector */ 376 unsigned char dp_ehd; /* end head */ 377 unsigned short dp_ecyl; /* end cylinder */ 378 unsigned char dp_name[16]; 379}; 380 381#else /* IBMPC */ 382#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 383#define DOSPARTOFF 446 384#define NDOSPART 4 385#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 386#define DOSPTYP_LINSWP 0x82 /* Linux swap partition */ 387#define DOSPTYP_LINUX 0x83 /* Linux partition */ 388#define DOSPTYP_EXT 5 /* DOS extended partition */ 389 390struct dos_partition { 391 unsigned char dp_flag; /* bootstrap flags */ 392 unsigned char dp_shd; /* starting head */ 393 unsigned char dp_ssect; /* starting sector */ 394 unsigned char dp_scyl; /* starting cylinder */ 395 unsigned char dp_typ; /* partition type */ 396 unsigned char dp_ehd; /* end head */ 397 unsigned char dp_esect; /* end sector */ 398 unsigned char dp_ecyl; /* end cylinder */ 399 u_int32_t dp_start; /* absolute starting sector number */ 400 u_int32_t dp_size; /* partition size in sectors */ 401}; 402#endif 403 404#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 405#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 406 407/* 408 * Disk-specific ioctls. 409 */ 410 /* get and set disklabel; DIOCGPART used internally */ 411#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 412#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 413#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 414#ifdef _KERNEL 415#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 416#endif 417#define DIOCGDVIRGIN _IOR('d', 105, struct disklabel)/* get virgin label */ 418 419#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 420 421#define DIOCGSECTORSIZE _IOR('d', 128, u_int) /* Get sector size in bytes */ 422#define DIOCGMEDIASIZE _IOR('d', 129, off_t) /* Get media size in bytes */ 423#define DIOCGFWSECTORS _IOR('d', 130, u_int) /* Get firmware sectorcount */ 424#define DIOCGFWHEADS _IOR('d', 131, u_int) /* Get firmware headcount */ 425#define DIOCGFWCYLINDERS _IOR('d', 132, u_int) /* Get firmware cyl'scount */ 426 427#ifdef _KERNEL 428 429/* 430 * XXX encoding of disk minor numbers, should be elsewhere. 431 * 432 * See <sys/reboot.h> for a possibly better encoding. 433 * 434 * "cpio -H newc" can be used to back up device files with large minor 435 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 436 * don't have enough bits, and cpio and tar don't notice the lossage. 437 * There are also some sign extension bugs. 438 */ 439 440/* 441 3 2 1 0 442 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 0 443 _________________________________________________________________ 444 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 445 ----------------------------------------------------------------- 446 | SPARE |UNIT_2 | SLICE | MAJOR? | UNIT |PART | 447 ----------------------------------------------------------------- 448*/ 449 450#define DKMAXUNIT 0x1ff 451 452#define dkmakeminor(unit, slice, part) \ 453 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \ 454 (((unit) & 0x1f) << 3) | (part)) 455#define dkpart(dev) (minor(dev) & 7) 456#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 457#define dksparebits(dev) ((minor(dev) >> 25) & 0x7f) 458 459struct bio; 460struct bio_queue_head; 461 462int bounds_check_with_label(struct bio *bp, struct disklabel *lp, 463 int wlabel); 464void diskerr(struct bio *bp, char *what, int blkdone, struct disklabel *lp); 465dev_t dkmodpart(dev_t dev, int part); 466dev_t dkmodslice(dev_t dev, int slice); 467u_int dkunit(dev_t dev); 468char *readdisklabel(dev_t dev, struct disklabel *lp); 469void bioqdisksort(struct bio_queue_head *ap, struct bio *bp); 470int setdisklabel(struct disklabel *olp, struct disklabel *nlp, 471 u_long openmask); 472int writedisklabel(dev_t dev, struct disklabel *lp); 473#ifdef __alpha__ 474struct buf; 475void alpha_fix_srm_checksum(struct buf *bp); 476#endif 477 478#endif /* _KERNEL */ 479 480#endif /* LOCORE */ 481 482#ifndef _KERNEL 483__BEGIN_DECLS 484struct disklabel *getdiskbyname(const char *); 485__END_DECLS 486#endif 487 488#endif /* !_SYS_DISKLABEL_H_ */ 489