diskmbr.h revision 15571
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 1.20 1996/03/11 02:06:30 hsu Exp $ 35 */ 36 37#ifndef _SYS_DISKLABEL_H_ 38#define _SYS_DISKLABEL_H_ 39 40/* 41 * Disk description table, see disktab(5) 42 */ 43#define _PATH_DISKTAB "/etc/disktab" 44#define DISKTAB "/etc/disktab" /* deprecated */ 45 46/* 47 * Each disk has a label which includes information about the hardware 48 * disk geometry, filesystem partitions, and drive specific information. 49 * The label is in block 0 or 1, possibly offset from the beginning 50 * to leave room for a bootstrap, etc. 51 */ 52 53/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 54#ifdef __i386__ 55#define LABELSECTOR 1 /* sector containing label */ 56#define LABELOFFSET 0 /* offset of label in sector */ 57#endif 58 59#ifndef LABELSECTOR 60#define LABELSECTOR 0 /* sector containing label */ 61#endif 62 63#ifndef LABELOFFSET 64#define LABELOFFSET 64 /* offset of label in sector */ 65#endif 66 67#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 68#ifndef MAXPARTITIONS 69#define MAXPARTITIONS 8 70#endif 71 72#define LABEL_PART 2 /* partition containing label */ 73#define RAW_PART 2 /* partition containing whole disk */ 74#define SWAP_PART 1 /* partition normally containing swap */ 75 76#ifndef LOCORE 77struct disklabel { 78 u_int32_t d_magic; /* the magic number */ 79 u_int16_t d_type; /* drive type */ 80 u_int16_t d_subtype; /* controller/d_type specific */ 81 char d_typename[16]; /* type name, e.g. "eagle" */ 82 83 /* 84 * d_packname contains the pack identifier and is returned when 85 * the disklabel is read off the disk or in-core copy. 86 * d_boot0 and d_boot1 are the (optional) names of the 87 * primary (block 0) and secondary (block 1-15) bootstraps 88 * as found in /usr/mdec. These are returned when using 89 * getdiskbyname(3) to retrieve the values from /etc/disktab. 90 */ 91#if defined(KERNEL) || defined(STANDALONE) 92 char d_packname[16]; /* pack identifier */ 93#else 94 union { 95 char un_d_packname[16]; /* pack identifier */ 96 struct { 97 char *un_d_boot0; /* primary bootstrap name */ 98 char *un_d_boot1; /* secondary bootstrap name */ 99 } un_b; 100 } d_un; 101#define d_packname d_un.un_d_packname 102#define d_boot0 d_un.un_b.un_d_boot0 103#define d_boot1 d_un.un_b.un_d_boot1 104#endif /* ! KERNEL or STANDALONE */ 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 union { 170 u_int16_t cpg; /* UFS: FS cylinders per group */ 171 u_int16_t sgs; /* LFS: FS segment shift */ 172 } __partition_u1; 173#define p_cpg __partition_u1.cpg 174#define p_sgs __partition_u1.sgs 175 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 176}; 177#else /* LOCORE */ 178 /* 179 * offsets for asm boot files. 180 */ 181 .set d_secsize,40 182 .set d_nsectors,44 183 .set d_ntracks,48 184 .set d_ncylinders,52 185 .set d_secpercyl,56 186 .set d_secperunit,60 187 .set d_end_,276 /* size of disk label */ 188#endif /* LOCORE */ 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 */ 201 202#ifdef DKTYPENAMES 203static char *dktypenames[] = { 204 "unknown", 205 "SMD", 206 "MSCP", 207 "old DEC", 208 "SCSI", 209 "ESDI", 210 "ST506", 211 "HP-IB", 212 "HP-FL", 213 "type 9", 214 "floppy", 215 "CCD", 216 NULL 217}; 218#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 219#endif 220 221/* 222 * Filesystem type and version. 223 * Used to interpret other filesystem-specific 224 * per-partition information. 225 */ 226#define FS_UNUSED 0 /* unused */ 227#define FS_SWAP 1 /* swap */ 228#define FS_V6 2 /* Sixth Edition */ 229#define FS_V7 3 /* Seventh Edition */ 230#define FS_SYSV 4 /* System V */ 231#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 232#define FS_V8 6 /* Eighth Edition, 4K blocks */ 233#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 234#define FS_MSDOS 8 /* MSDOS file system */ 235#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 236#define FS_OTHER 10 /* in use, but unknown/unsupported */ 237#define FS_HPFS 11 /* OS/2 high-performance file system */ 238#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 239#define FS_BOOT 13 /* partition contains bootstrap */ 240 241#ifdef DKTYPENAMES 242static char *fstypenames[] = { 243 "unused", 244 "swap", 245 "Version 6", 246 "Version 7", 247 "System V", 248 "4.1BSD", 249 "Eighth Edition", 250 "4.2BSD", 251 "MSDOS", 252 "4.4LFS", 253 "unknown", 254 "HPFS", 255 "ISO9660", 256 "boot", 257 NULL 258}; 259#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 260#endif 261 262/* 263 * flags shared by various drives: 264 */ 265#define D_REMOVABLE 0x01 /* removable media */ 266#define D_ECC 0x02 /* supports ECC */ 267#define D_BADSECT 0x04 /* supports bad sector forw. */ 268#define D_RAMDISK 0x08 /* disk emulator */ 269#define D_CHAIN 0x10 /* can do back-back transfers */ 270 271/* 272 * Drive data for SMD. 273 */ 274#define d_smdflags d_drivedata[0] 275#define D_SSE 0x1 /* supports skip sectoring */ 276#define d_mindist d_drivedata[1] 277#define d_maxdist d_drivedata[2] 278#define d_sdist d_drivedata[3] 279 280/* 281 * Drive data for ST506. 282 */ 283#define d_precompcyl d_drivedata[0] 284#define d_gap3 d_drivedata[1] /* used only when formatting */ 285 286/* 287 * Drive data for SCSI. 288 */ 289#define d_blind d_drivedata[0] 290 291#ifndef LOCORE 292/* 293 * Structure used to perform a format or other raw operation, returning 294 * data and/or register values. Register identification and format 295 * are device- and driver-dependent. 296 */ 297struct format_op { 298 char *df_buf; 299 int df_count; /* value-result */ 300 daddr_t df_startblk; 301 int df_reg[8]; /* result */ 302}; 303 304/* 305 * Structure used internally to retrieve information about a partition 306 * on a disk. 307 */ 308struct partinfo { 309 struct disklabel *disklab; 310 struct partition *part; 311}; 312 313/* DOS partition table -- located in boot block */ 314 315#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 316#define DOSPARTOFF 446 317#define NDOSPART 4 318#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 319 320struct dos_partition { 321 unsigned char dp_flag; /* bootstrap flags */ 322 unsigned char dp_shd; /* starting head */ 323 unsigned char dp_ssect; /* starting sector */ 324 unsigned char dp_scyl; /* starting cylinder */ 325 unsigned char dp_typ; /* partition type */ 326 unsigned char dp_ehd; /* end head */ 327 unsigned char dp_esect; /* end sector */ 328 unsigned char dp_ecyl; /* end cylinder */ 329 unsigned long dp_start; /* absolute starting sector number */ 330 unsigned long dp_size; /* partition size in sectors */ 331}; 332 333#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 334#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 335 336/* 337 * Disk-specific ioctls. 338 */ 339 /* get and set disklabel; DIOCGPART used internally */ 340#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 341#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 342#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 343#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 344 345/* do format operation, read or write */ 346#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 347#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 348 349#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 350#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 351#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 352 353#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 354#define DIOCSBADSCAN _IOW('d', 111, int) /* set badscan mode */ 355 356/* 357 * XXX encoding of disk minor numbers, should be elsewhere. 358 * 359 * See <sys/reboot.h> for a possibly better encoding. 360 * 361 * "cpio -H newc" can be used to back up device files with large minor 362 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 363 * don't have enough bits, and cpio and tar don't notice the lossage. 364 * There are also some sign extension bugs. 365 */ 366 367/* 368 3 2 1 0 369 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 0 370 _________________________________________________________________ 371 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 372 ----------------------------------------------------------------- 373 | TYPE | SLICE | MAJOR? | UNIT |PART | 374 ----------------------------------------------------------------- 375 | TYPE |PART2| SLICE | MAJOR? | UNIT |PART | <-soon 376 ----------------------------------------------------------------- 377 378 I want 3 more part bits (taken from 'TYPE' (useless as it is) (JRE) 379*/ 380#define dkmakeminor(unit, slice, part) \ 381 (((slice) << 16) | ((unit) << 3) | (part)) 382#define dkmodpart(dev, part) (((dev) & ~(dev_t)7) | (part)) 383#define dkmodslice(dev, slice) (((dev) & ~(dev_t)0x1f0000) | ((slice) << 16)) 384#define dkpart(dev) (minor(dev) & 7) 385#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 386#define dktype(dev) ((minor(dev) >> 21) & 0x7ff) 387#define dkunit(dev) ((minor(dev) >> 3) & 0x1f) 388 389#ifdef KERNEL 390/* 391 * We're not ready to use <sys/disk.h>. 392 */ 393#include <sys/conf.h> 394 395struct buf_queue_head; 396 397int bounds_check_with_label __P((struct buf *bp, struct disklabel *lp, 398 int wlabel)); 399void diskerr __P((struct buf *bp, char *dname, char *what, int pri, 400 int blkdone, struct disklabel *lp)); 401void disksort __P((struct buf *ap, struct buf *bp)); 402u_int dkcksum __P((struct disklabel *lp)); 403char *readdisklabel __P((dev_t dev, d_strategy_t *strat, 404 struct disklabel *lp)); 405void tqdisksort __P((struct buf_queue_head *ap, struct buf *bp)); 406int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 407 u_long openmask)); 408int writedisklabel __P((dev_t dev, d_strategy_t *strat, 409 struct disklabel *lp)); 410 411#endif /* KERNEL */ 412 413#endif /* LOCORE */ 414 415#if !defined(KERNEL) && !defined(LOCORE) 416 417#include <sys/cdefs.h> 418 419__BEGIN_DECLS 420struct disklabel *getdiskbyname __P((const char *)); 421__END_DECLS 422 423#endif 424 425#endif /* !_SYS_DISKLABEL_H_ */ 426