disklabel.h revision 93810
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 93810 2002-04-04 20:34:48Z 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#define LABEL_PART 2 /* partition containing label */ 92#define RAW_PART 2 /* partition containing whole disk */ 93#define SWAP_PART 1 /* partition normally containing swap */ 94 95struct disklabel { 96 u_int32_t d_magic; /* the magic number */ 97 u_int16_t d_type; /* drive type */ 98 u_int16_t d_subtype; /* controller/d_type specific */ 99 char d_typename[16]; /* type name, e.g. "eagle" */ 100 101 char d_packname[16]; /* pack identifier */ 102 103 /* disk geometry: */ 104 u_int32_t d_secsize; /* # of bytes per sector */ 105 u_int32_t d_nsectors; /* # of data sectors per track */ 106 u_int32_t d_ntracks; /* # of tracks per cylinder */ 107 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 108 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 109 u_int32_t d_secperunit; /* # of data sectors per unit */ 110 111 /* 112 * Spares (bad sector replacements) below are not counted in 113 * d_nsectors or d_secpercyl. Spare sectors are assumed to 114 * be physical sectors which occupy space at the end of each 115 * track and/or cylinder. 116 */ 117 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 118 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 119 /* 120 * Alternate cylinders include maintenance, replacement, configuration 121 * description areas, etc. 122 */ 123 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 124 125 /* hardware characteristics: */ 126 /* 127 * d_interleave, d_trackskew and d_cylskew describe perturbations 128 * in the media format used to compensate for a slow controller. 129 * Interleave is physical sector interleave, set up by the 130 * formatter or controller when formatting. When interleaving is 131 * in use, logically adjacent sectors are not physically 132 * contiguous, but instead are separated by some number of 133 * sectors. It is specified as the ratio of physical sectors 134 * traversed per logical sector. Thus an interleave of 1:1 135 * implies contiguous layout, while 2:1 implies that logical 136 * sector 0 is separated by one sector from logical sector 1. 137 * d_trackskew is the offset of sector 0 on track N relative to 138 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 139 * is the offset of sector 0 on cylinder N relative to sector 0 140 * on cylinder N-1. 141 */ 142 u_int16_t d_rpm; /* rotational speed */ 143 u_int16_t d_interleave; /* hardware sector interleave */ 144 u_int16_t d_trackskew; /* sector 0 skew, per track */ 145 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 146 u_int32_t d_headswitch; /* head switch time, usec */ 147 u_int32_t d_trkseek; /* track-to-track seek, usec */ 148 u_int32_t d_flags; /* generic flags */ 149#define NDDATA 5 150 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 151#define NSPARE 5 152 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 153 u_int32_t d_magic2; /* the magic number (again) */ 154 u_int16_t d_checksum; /* xor of data incl. partitions */ 155 156 /* filesystem and partition information: */ 157 u_int16_t d_npartitions; /* number of partitions in following */ 158 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 159 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 160 struct partition { /* the partition table */ 161 u_int32_t p_size; /* number of sectors in partition */ 162 u_int32_t p_offset; /* starting sector */ 163 u_int32_t p_fsize; /* filesystem basic fragment size */ 164 u_int8_t p_fstype; /* filesystem type, see below */ 165 u_int8_t p_frag; /* filesystem fragments per block */ 166 u_int16_t p_cpg; /* filesystem cylinders per group */ 167 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 168}; 169 170#ifdef CTASSERT 171CTASSERT(sizeof(struct disklabel) == 276); 172#endif 173 174static __inline u_int16_t dkcksum(struct disklabel *lp); 175static __inline u_int16_t 176dkcksum(lp) 177 struct disklabel *lp; 178{ 179 u_int16_t *start, *end; 180 u_int16_t sum = 0; 181 182 start = (u_int16_t *)lp; 183 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 184 while (start < end) 185 sum ^= *start++; 186 return (sum); 187} 188 189 190/* d_type values: */ 191#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 192#define DTYPE_MSCP 2 /* MSCP */ 193#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 194#define DTYPE_SCSI 4 /* SCSI */ 195#define DTYPE_ESDI 5 /* ESDI interface */ 196#define DTYPE_ST506 6 /* ST506 etc. */ 197#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 198#define DTYPE_HPFL 8 /* HP Fiber-link */ 199#define DTYPE_FLOPPY 10 /* floppy */ 200#define DTYPE_CCD 11 /* concatenated disk */ 201#define DTYPE_VINUM 12 /* vinum volume */ 202#define DTYPE_DOC2K 13 /* Msys DiskOnChip */ 203#define DTYPE_JFS2 16 /* IBM JFS 2 */ 204 205#ifdef DKTYPENAMES 206static char *dktypenames[] = { 207 "unknown", 208 "SMD", 209 "MSCP", 210 "old DEC", 211 "SCSI", 212 "ESDI", 213 "ST506", 214 "HP-IB", 215 "HP-FL", 216 "type 9", 217 "floppy", 218 "CCD", 219 "Vinum", 220 "DOC2K", 221 "?", 222 "?", 223 "jfs", 224 NULL 225}; 226#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 227#endif 228 229/* 230 * Filesystem type and version. 231 * Used to interpret other filesystem-specific 232 * per-partition information. 233 */ 234#define FS_UNUSED 0 /* unused */ 235#define FS_SWAP 1 /* swap */ 236#define FS_V6 2 /* Sixth Edition */ 237#define FS_V7 3 /* Seventh Edition */ 238#define FS_SYSV 4 /* System V */ 239#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 240#define FS_V8 6 /* Eighth Edition, 4K blocks */ 241#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 242#define FS_MSDOS 8 /* MSDOS file system */ 243#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 244#define FS_OTHER 10 /* in use, but unknown/unsupported */ 245#define FS_HPFS 11 /* OS/2 high-performance file system */ 246#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 247#define FS_BOOT 13 /* partition contains bootstrap */ 248#define FS_VINUM 14 /* Vinum drive */ 249#define FS_JFS2 21 /* IBM JFS2 */ 250 251#ifdef DKTYPENAMES 252static char *fstypenames[] = { 253 "unused", 254 "swap", 255 "Version 6", 256 "Version 7", 257 "System V", 258 "4.1BSD", 259 "Eighth Edition", 260 "4.2BSD", 261 "MSDOS", 262 "4.4LFS", 263 "unknown", 264 "HPFS", 265 "ISO9660", 266 "boot", 267 "vinum", 268 "?", 269 "?", 270 "?", 271 "?", 272 "?", 273 "?", 274 "?", 275 "jfs", 276 NULL 277}; 278#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 279#endif 280 281/* 282 * flags shared by various drives: 283 */ 284#define D_REMOVABLE 0x01 /* removable media */ 285#define D_ECC 0x02 /* supports ECC */ 286#define D_BADSECT 0x04 /* supports bad sector forw. */ 287#define D_RAMDISK 0x08 /* disk emulator */ 288#define D_CHAIN 0x10 /* can do back-back transfers */ 289 290/* DOS partition table -- located in boot block */ 291 292#if defined(PC98) && !defined(PC98_ATCOMPAT) 293#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 294#define DOSPARTOFF 0 295#define NDOSPART 16 296#define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 297 298struct dos_partition { 299 unsigned char dp_mid; 300#define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */ 301 unsigned char dp_sid; 302#define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */ 303 unsigned char dp_dum1; 304 unsigned char dp_dum2; 305 unsigned char dp_ipl_sct; 306 unsigned char dp_ipl_head; 307 unsigned short dp_ipl_cyl; 308 unsigned char dp_ssect; /* starting sector */ 309 unsigned char dp_shd; /* starting head */ 310 unsigned short dp_scyl; /* starting cylinder */ 311 unsigned char dp_esect; /* end sector */ 312 unsigned char dp_ehd; /* end head */ 313 unsigned short dp_ecyl; /* end cylinder */ 314 unsigned char dp_name[16]; 315}; 316 317#else /* IBMPC */ 318#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 319#define DOSPARTOFF 446 320#define NDOSPART 4 321#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 322#define DOSPTYP_LINSWP 0x82 /* Linux swap partition */ 323#define DOSPTYP_LINUX 0x83 /* Linux partition */ 324#define DOSPTYP_EXT 5 /* DOS extended partition */ 325 326struct dos_partition { 327 unsigned char dp_flag; /* bootstrap flags */ 328 unsigned char dp_shd; /* starting head */ 329 unsigned char dp_ssect; /* starting sector */ 330 unsigned char dp_scyl; /* starting cylinder */ 331 unsigned char dp_typ; /* partition type */ 332 unsigned char dp_ehd; /* end head */ 333 unsigned char dp_esect; /* end sector */ 334 unsigned char dp_ecyl; /* end cylinder */ 335 u_int32_t dp_start; /* absolute starting sector number */ 336 u_int32_t dp_size; /* partition size in sectors */ 337}; 338#ifdef CTASSERT 339CTASSERT(sizeof (struct dos_partition) == 16); 340#endif 341#endif 342 343#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 344#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 345 346/* 347 * Disk-specific ioctls. 348 */ 349 /* get and set disklabel */ 350#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 351#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 352#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 353#define DIOCGDVIRGIN _IOR('d', 105, struct disklabel)/* get virgin label */ 354 355#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 356 357#define DIOCGSECTORSIZE _IOR('d', 128, u_int) /* Get sector size in bytes */ 358#define DIOCGMEDIASIZE _IOR('d', 129, off_t) /* Get media size in bytes */ 359#define DIOCGFWSECTORS _IOR('d', 130, u_int) /* Get firmware sectorcount */ 360#define DIOCGFWHEADS _IOR('d', 131, u_int) /* Get firmware headcount */ 361#define DIOCGFWCYLINDERS _IOR('d', 132, u_int) /* Get firmware cyl'scount */ 362#define DIOCGKERNELDUMP _IOW('d', 133, u_int) /* Set/Clear kernel dumps */ 363 364#ifdef __alpha__ 365struct disklabel_alphahack { 366 struct disklabel dl; 367 char pad[4]; 368}; 369#define DIOCGDINFO_ALPHAHACK _IOR('d', 101, struct disklabel_alphahack)/* get */ 370#define DIOCSDINFO_ALPHAHACK _IOW('d', 102, struct disklabel_alphahack)/* set */ 371#define DIOCWDINFO_ALPHAHACK _IOW('d', 103, struct disklabel_alphahack)/* set, update disk */ 372#define DIOCGDVIRGIN_ALPHAHACK _IOR('d', 105, struct disklabel_alphahack)/* get virgin label */ 373#ifdef CTASSERT 374CTASSERT(sizeof(struct disklabel_alphahack) == 280); 375#endif 376#endif 377 378#ifdef _KERNEL 379 380/* 381 * XXX encoding of disk minor numbers, should be elsewhere. 382 * 383 * See <sys/reboot.h> for a possibly better encoding. 384 * 385 * "cpio -H newc" can be used to back up device files with large minor 386 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 387 * don't have enough bits, and cpio and tar don't notice the lossage. 388 * There are also some sign extension bugs. 389 */ 390 391/* 392 3 2 1 0 393 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 0 394 _________________________________________________________________ 395 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 396 ----------------------------------------------------------------- 397 | SPARE |UNIT_2 | SLICE | MAJOR? | UNIT |PART | 398 ----------------------------------------------------------------- 399*/ 400 401#define DKMAXUNIT 0x1ff 402 403#define dkmakeminor(unit, slice, part) \ 404 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \ 405 (((unit) & 0x1f) << 3) | (part)) 406#define dkpart(dev) (minor(dev) & 7) 407#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 408#define dksparebits(dev) ((minor(dev) >> 25) & 0x7f) 409 410struct bio; 411struct bio_queue_head; 412 413int bounds_check_with_label(struct bio *bp, struct disklabel *lp, 414 int wlabel); 415void diskerr(struct bio *bp, char *what, int blkdone, struct disklabel *lp); 416dev_t dkmodpart(dev_t dev, int part); 417dev_t dkmodslice(dev_t dev, int slice); 418u_int dkunit(dev_t dev); 419char *readdisklabel(dev_t dev, struct disklabel *lp); 420void bioqdisksort(struct bio_queue_head *ap, struct bio *bp); 421int setdisklabel(struct disklabel *olp, struct disklabel *nlp, 422 u_long openmask); 423int writedisklabel(dev_t dev, struct disklabel *lp); 424#ifdef __alpha__ 425struct buf; 426void alpha_fix_srm_checksum(struct buf *bp); 427#endif 428 429#endif /* _KERNEL */ 430 431 432#ifndef _KERNEL 433__BEGIN_DECLS 434struct disklabel *getdiskbyname(const char *); 435__END_DECLS 436#endif 437 438#endif /* !_SYS_DISKLABEL_H_ */ 439