disklabel.h revision 103100
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 103100 2002-09-08 15:13:33Z 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 50/* 51 * Each disk has a label which includes information about the hardware 52 * disk geometry, filesystem partitions, and drive specific information. 53 * The label is in block 0 or 1, possibly offset from the beginning 54 * to leave room for a bootstrap, etc. 55 */ 56 57/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 58#ifdef __i386__ 59#define LABELSECTOR 1 /* sector containing label */ 60#define LABELOFFSET 0 /* offset of label in sector */ 61#endif 62 63#ifdef __alpha__ 64#define LABELSECTOR 0 65#define LABELOFFSET 64 66#endif 67 68#ifdef __ia64__ 69#define LABELSECTOR 1 70#define LABELOFFSET 0 71#endif 72 73#ifdef __sparc64__ 74#define LABELSECTOR 0 75#define LABELOFFSET 128 76#endif 77 78#ifndef LABELSECTOR 79#define LABELSECTOR 0 80#endif 81 82#ifndef LABELOFFSET 83#define LABELOFFSET 64 84#endif 85 86#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 87#ifndef MAXPARTITIONS 88#define MAXPARTITIONS 8 89#endif 90 91/* Size of bootblock area in sector-size neutral bytes */ 92#define BBSIZE 8192 93 94#define LABEL_PART 2 /* partition containing label */ 95#define RAW_PART 2 /* partition containing whole disk */ 96#define SWAP_PART 1 /* partition normally containing swap */ 97 98struct disklabel { 99 u_int32_t d_magic; /* the magic number */ 100 u_int16_t d_type; /* drive type */ 101 u_int16_t d_subtype; /* controller/d_type specific */ 102 char d_typename[16]; /* type name, e.g. "eagle" */ 103 104 char d_packname[16]; /* pack identifier */ 105 106 /* disk geometry: */ 107 u_int32_t d_secsize; /* # of bytes per sector */ 108 u_int32_t d_nsectors; /* # of data sectors per track */ 109 u_int32_t d_ntracks; /* # of tracks per cylinder */ 110 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 111 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 112 u_int32_t d_secperunit; /* # of data sectors per unit */ 113 114 /* 115 * Spares (bad sector replacements) below are not counted in 116 * d_nsectors or d_secpercyl. Spare sectors are assumed to 117 * be physical sectors which occupy space at the end of each 118 * track and/or cylinder. 119 */ 120 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 121 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 122 /* 123 * Alternate cylinders include maintenance, replacement, configuration 124 * description areas, etc. 125 */ 126 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 127 128 /* hardware characteristics: */ 129 /* 130 * d_interleave, d_trackskew and d_cylskew describe perturbations 131 * in the media format used to compensate for a slow controller. 132 * Interleave is physical sector interleave, set up by the 133 * formatter or controller when formatting. When interleaving is 134 * in use, logically adjacent sectors are not physically 135 * contiguous, but instead are separated by some number of 136 * sectors. It is specified as the ratio of physical sectors 137 * traversed per logical sector. Thus an interleave of 1:1 138 * implies contiguous layout, while 2:1 implies that logical 139 * sector 0 is separated by one sector from logical sector 1. 140 * d_trackskew is the offset of sector 0 on track N relative to 141 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 142 * is the offset of sector 0 on cylinder N relative to sector 0 143 * on cylinder N-1. 144 */ 145 u_int16_t d_rpm; /* rotational speed */ 146 u_int16_t d_interleave; /* hardware sector interleave */ 147 u_int16_t d_trackskew; /* sector 0 skew, per track */ 148 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 149 u_int32_t d_headswitch; /* head switch time, usec */ 150 u_int32_t d_trkseek; /* track-to-track seek, usec */ 151 u_int32_t d_flags; /* generic flags */ 152#define NDDATA 5 153 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 154#define NSPARE 5 155 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 156 u_int32_t d_magic2; /* the magic number (again) */ 157 u_int16_t d_checksum; /* xor of data incl. partitions */ 158 159 /* filesystem and partition information: */ 160 u_int16_t d_npartitions; /* number of partitions in following */ 161 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 162 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 163 struct partition { /* the partition table */ 164 u_int32_t p_size; /* number of sectors in partition */ 165 u_int32_t p_offset; /* starting sector */ 166 u_int32_t p_fsize; /* filesystem basic fragment size */ 167 u_int8_t p_fstype; /* filesystem type, see below */ 168 u_int8_t p_frag; /* filesystem fragments per block */ 169 u_int16_t p_cpg; /* filesystem cylinders per group */ 170 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 171}; 172 173#ifdef CTASSERT 174CTASSERT(sizeof(struct disklabel) == 276); 175#endif 176 177static __inline u_int16_t dkcksum(struct disklabel *lp); 178static __inline u_int16_t 179dkcksum(struct disklabel *lp) 180{ 181 u_int16_t *start, *end; 182 u_int16_t sum = 0; 183 184 start = (u_int16_t *)lp; 185 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 186 while (start < end) 187 sum ^= *start++; 188 return (sum); 189} 190 191 192/* 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#define DTYPE_VINUM 12 /* vinum volume */ 204#define DTYPE_DOC2K 13 /* Msys DiskOnChip */ 205#define DTYPE_JFS2 16 /* IBM JFS 2 */ 206 207#ifdef DKTYPENAMES 208static const char *dktypenames[] = { 209 "unknown", 210 "SMD", 211 "MSCP", 212 "old DEC", 213 "SCSI", 214 "ESDI", 215 "ST506", 216 "HP-IB", 217 "HP-FL", 218 "type 9", 219 "floppy", 220 "CCD", 221 "Vinum", 222 "DOC2K", 223 "?", 224 "?", 225 "jfs", 226 NULL 227}; 228#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 229#endif 230 231/* 232 * Filesystem type and version. 233 * Used to interpret other filesystem-specific 234 * per-partition information. 235 */ 236#define FS_UNUSED 0 /* unused */ 237#define FS_SWAP 1 /* swap */ 238#define FS_V6 2 /* Sixth Edition */ 239#define FS_V7 3 /* Seventh Edition */ 240#define FS_SYSV 4 /* System V */ 241#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 242#define FS_V8 6 /* Eighth Edition, 4K blocks */ 243#define FS_BSDFFS 7 /* 4.2BSD fast filesystem */ 244#define FS_MSDOS 8 /* MSDOS filesystem */ 245#define FS_BSDLFS 9 /* 4.4BSD log-structured filesystem */ 246#define FS_OTHER 10 /* in use, but unknown/unsupported */ 247#define FS_HPFS 11 /* OS/2 high-performance filesystem */ 248#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 249#define FS_BOOT 13 /* partition contains bootstrap */ 250#define FS_VINUM 14 /* Vinum drive */ 251#define FS_JFS2 21 /* IBM JFS2 */ 252 253#ifdef FSTYPENAMES 254static const char *fstypenames[] = { 255 "unused", 256 "swap", 257 "Version 6", 258 "Version 7", 259 "System V", 260 "4.1BSD", 261 "Eighth Edition", 262 "4.2BSD", 263 "MSDOS", 264 "4.4LFS", 265 "unknown", 266 "HPFS", 267 "ISO9660", 268 "boot", 269 "vinum", 270 "?", 271 "?", 272 "?", 273 "?", 274 "?", 275 "?", 276 "?", 277 "jfs", 278 NULL 279}; 280#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 281#endif 282 283/* 284 * flags shared by various drives: 285 */ 286#define D_REMOVABLE 0x01 /* removable media */ 287#define D_ECC 0x02 /* supports ECC */ 288#define D_BADSECT 0x04 /* supports bad sector forw. */ 289#define D_RAMDISK 0x08 /* disk emulator */ 290#define D_CHAIN 0x10 /* can do back-back transfers */ 291 292/* DOS partition table -- located in boot block */ 293 294#if defined(PC98) && !defined(PC98_ATCOMPAT) 295#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 296#define DOSPARTOFF 0 297#define NDOSPART 16 298#define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 299 300struct dos_partition { 301 unsigned char dp_mid; 302#define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */ 303 unsigned char dp_sid; 304#define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */ 305 unsigned char dp_dum1; 306 unsigned char dp_dum2; 307 unsigned char dp_ipl_sct; 308 unsigned char dp_ipl_head; 309 unsigned short dp_ipl_cyl; 310 unsigned char dp_ssect; /* starting sector */ 311 unsigned char dp_shd; /* starting head */ 312 unsigned short dp_scyl; /* starting cylinder */ 313 unsigned char dp_esect; /* end sector */ 314 unsigned char dp_ehd; /* end head */ 315 unsigned short dp_ecyl; /* end cylinder */ 316 unsigned char dp_name[16]; 317}; 318 319#else /* IBMPC */ 320#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 321#define DOSPARTOFF 446 322#define NDOSPART 4 323#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 324#define DOSPTYP_LINSWP 0x82 /* Linux swap partition */ 325#define DOSPTYP_LINUX 0x83 /* Linux partition */ 326#define DOSPTYP_EXT 5 /* DOS extended partition */ 327#define DOSPTYP_EXTLBA 15 /* DOS extended partition */ 328 329struct dos_partition { 330 unsigned char dp_flag; /* bootstrap flags */ 331 unsigned char dp_shd; /* starting head */ 332 unsigned char dp_ssect; /* starting sector */ 333 unsigned char dp_scyl; /* starting cylinder */ 334 unsigned char dp_typ; /* partition type */ 335 unsigned char dp_ehd; /* end head */ 336 unsigned char dp_esect; /* end sector */ 337 unsigned char dp_ecyl; /* end cylinder */ 338 u_int32_t dp_start; /* absolute starting sector number */ 339 u_int32_t dp_size; /* partition size in sectors */ 340}; 341#ifdef CTASSERT 342CTASSERT(sizeof (struct dos_partition) == 16); 343#endif 344#endif 345 346#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 347#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 348 349/* 350 * Disklabel-specific ioctls. 351 * 352 * NB: <sys/disk.h> defines ioctls from 'd'/128 and up. 353 */ 354 /* get and set disklabel */ 355#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 356#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 357#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 358#define DIOCGDVIRGIN _IOR('d', 105, struct disklabel)/* get virgin label */ 359 360#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 361 362#ifdef _KERNEL 363 364/* 365 * XXX encoding of disk minor numbers, should be elsewhere. 366 * 367 * See <sys/reboot.h> for a possibly better encoding. 368 * 369 * "cpio -H newc" can be used to back up device files with large minor 370 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 371 * don't have enough bits, and cpio and tar don't notice the lossage. 372 * There are also some sign extension bugs. 373 */ 374 375/* 376 3 2 1 0 377 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 0 378 _________________________________________________________________ 379 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 380 ----------------------------------------------------------------- 381 | SPARE |UNIT_2 | SLICE | MAJOR? | UNIT |PART | 382 ----------------------------------------------------------------- 383*/ 384 385#define DKMAXUNIT 0x1ff 386 387#define dkmakeminor(unit, slice, part) \ 388 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \ 389 (((unit) & 0x1f) << 3) | (part)) 390#define dkpart(dev) (minor(dev) & 7) 391#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 392#define dksparebits(dev) ((minor(dev) >> 25) & 0x7f) 393 394struct bio; 395struct bio_queue_head; 396 397int bounds_check_with_label(struct bio *bp, struct disklabel *lp, 398 int wlabel); 399void diskerr(struct bio *bp, char *what, int blkdone, struct disklabel *lp); 400dev_t dkmodpart(dev_t dev, int part); 401dev_t dkmodslice(dev_t dev, int slice); 402u_int dkunit(dev_t dev); 403char *readdisklabel(dev_t dev, struct disklabel *lp); 404void bioqdisksort(struct bio_queue_head *ap, struct bio *bp); 405int setdisklabel(struct disklabel *olp, struct disklabel *nlp, 406 u_long openmask); 407int writedisklabel(dev_t dev, struct disklabel *lp); 408#ifdef __alpha__ 409struct buf; 410void alpha_fix_srm_checksum(struct buf *bp); 411#endif 412 413#endif /* _KERNEL */ 414 415 416#ifndef _KERNEL 417__BEGIN_DECLS 418struct disklabel *getdiskbyname(const char *); 419__END_DECLS 420#endif 421 422#endif /* !_SYS_DISKLABEL_H_ */ 423