disklabel.h revision 12478
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 8.1 (Berkeley) 6/2/93 34 * $Id: disklabel.h,v 1.18 1995/11/24 14:50:39 bde 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_long) 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_long d_magic; /* the magic number */ 79 short d_type; /* drive type */ 80 short d_subtype; /* controller/d_type specific */ 81 char d_typename[16]; /* type name, e.g. "eagle" */ 82 /* 83 * d_packname contains the pack identifier and is returned when 84 * the disklabel is read off the disk or in-core copy. 85 * d_boot0 and d_boot1 are the (optional) names of the 86 * primary (block 0) and secondary (block 1-15) bootstraps 87 * as found in /usr/mdec. These are returned when using 88 * getdiskbyname(3) to retrieve the values from /etc/disktab. 89 */ 90#if defined(KERNEL) || defined(STANDALONE) 91 char d_packname[16]; /* pack identifier */ 92#else 93 union { 94 char un_d_packname[16]; /* pack identifier */ 95 struct { 96 char *un_d_boot0; /* primary bootstrap name */ 97 char *un_d_boot1; /* secondary bootstrap name */ 98 } un_b; 99 } d_un; 100#define d_packname d_un.un_d_packname 101#define d_boot0 d_un.un_b.un_d_boot0 102#define d_boot1 d_un.un_b.un_d_boot1 103#endif /* ! KERNEL or STANDALONE */ 104 /* disk geometry: */ 105 u_long d_secsize; /* # of bytes per sector */ 106 u_long d_nsectors; /* # of data sectors per track */ 107 u_long d_ntracks; /* # of tracks per cylinder */ 108 u_long d_ncylinders; /* # of data cylinders per unit */ 109 u_long d_secpercyl; /* # of data sectors per cylinder */ 110 u_long d_secperunit; /* # of data sectors per unit */ 111 /* 112 * Spares (bad sector replacements) below 113 * are not counted in d_nsectors or d_secpercyl. 114 * Spare sectors are assumed to be physical sectors 115 * which occupy space at the end of each track and/or cylinder. 116 */ 117 u_short d_sparespertrack; /* # of spare sectors per track */ 118 u_short d_sparespercyl; /* # of spare sectors per cylinder */ 119 /* 120 * Alternate cylinders include maintenance, replacement, 121 * configuration description areas, etc. 122 */ 123 u_long 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 formatter 130 * or controller when formatting. When interleaving is in use, 131 * logically adjacent sectors are not physically contiguous, 132 * but instead are separated by some number of sectors. 133 * It is specified as the ratio of physical sectors traversed 134 * per logical sector. Thus an interleave of 1:1 implies contiguous 135 * layout, while 2:1 implies that logical sector 0 is separated 136 * by one sector from logical sector 1. 137 * d_trackskew is the offset of sector 0 on track N 138 * relative to sector 0 on track N-1 on the same cylinder. 139 * Finally, d_cylskew is the offset of sector 0 on cylinder N 140 * relative to sector 0 on cylinder N-1. 141 */ 142 u_short d_rpm; /* rotational speed */ 143 u_short d_interleave; /* hardware sector interleave */ 144 u_short d_trackskew; /* sector 0 skew, per track */ 145 u_short d_cylskew; /* sector 0 skew, per cylinder */ 146 u_long d_headswitch; /* head switch time, usec */ 147 u_long d_trkseek; /* track-to-track seek, usec */ 148 u_long d_flags; /* generic flags */ 149#define NDDATA 5 150 u_long d_drivedata[NDDATA]; /* drive-type specific information */ 151#define NSPARE 5 152 u_long d_spare[NSPARE]; /* reserved for future use */ 153 u_long d_magic2; /* the magic number (again) */ 154 u_short d_checksum; /* xor of data incl. partitions */ 155 156 /* filesystem and partition information: */ 157 u_short d_npartitions; /* number of partitions in following */ 158 u_long d_bbsize; /* size of boot area at sn0, bytes */ 159 u_long d_sbsize; /* max size of fs superblock, bytes */ 160 struct partition { /* the partition table */ 161 u_long p_size; /* number of sectors in partition */ 162 u_long p_offset; /* starting sector */ 163 u_long p_fsize; /* filesystem basic fragment size */ 164 u_char p_fstype; /* filesystem type, see below */ 165 u_char p_frag; /* filesystem fragments per block */ 166 union { 167 u_short cpg; /* UFS: FS cylinders per group */ 168 u_short sgs; /* LFS: FS segment shift */ 169 } __partition_u1; 170#define p_cpg __partition_u1.cpg 171#define p_sgs __partition_u1.sgs 172 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 173}; 174#else /* LOCORE */ 175 /* 176 * offsets for asm boot files. 177 */ 178 .set d_secsize,40 179 .set d_nsectors,44 180 .set d_ntracks,48 181 .set d_ncylinders,52 182 .set d_secpercyl,56 183 .set d_secperunit,60 184 .set d_end_,276 /* size of disk label */ 185#endif /* LOCORE */ 186 187/* d_type values: */ 188#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 189#define DTYPE_MSCP 2 /* MSCP */ 190#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 191#define DTYPE_SCSI 4 /* SCSI */ 192#define DTYPE_ESDI 5 /* ESDI interface */ 193#define DTYPE_ST506 6 /* ST506 etc. */ 194#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 195#define DTYPE_HPFL 8 /* HP Fiber-link */ 196#define DTYPE_FLOPPY 10 /* floppy */ 197 198#ifdef DKTYPENAMES 199static char *dktypenames[] = { 200 "unknown", 201 "SMD", 202 "MSCP", 203 "old DEC", 204 "SCSI", 205 "ESDI", 206 "ST506", 207 "HP-IB", 208 "HP-FL", 209 "type 9", 210 "floppy", 211 0 212}; 213#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 214#endif 215 216/* 217 * Filesystem type and version. 218 * Used to interpret other filesystem-specific 219 * per-partition information. 220 */ 221#define FS_UNUSED 0 /* unused */ 222#define FS_SWAP 1 /* swap */ 223#define FS_V6 2 /* Sixth Edition */ 224#define FS_V7 3 /* Seventh Edition */ 225#define FS_SYSV 4 /* System V */ 226#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 227#define FS_V8 6 /* Eighth Edition, 4K blocks */ 228#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 229#define FS_MSDOS 8 /* MSDOS file system */ 230#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 231#define FS_OTHER 10 /* in use, but unknown/unsupported */ 232#define FS_HPFS 11 /* OS/2 high-performance file system */ 233#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 234#define FS_BOOT 13 /* partition contains bootstrap */ 235 236#ifdef DKTYPENAMES 237static char *fstypenames[] = { 238 "unused", 239 "swap", 240 "Version 6", 241 "Version 7", 242 "System V", 243 "4.1BSD", 244 "Eighth Edition", 245 "4.2BSD", 246 "MSDOS", 247 "4.4LFS", 248 "unknown", 249 "HPFS", 250 "ISO9660", 251 "boot", 252 0 253}; 254#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 255#endif 256 257/* 258 * flags shared by various drives: 259 */ 260#define D_REMOVABLE 0x01 /* removable media */ 261#define D_ECC 0x02 /* supports ECC */ 262#define D_BADSECT 0x04 /* supports bad sector forw. */ 263#define D_RAMDISK 0x08 /* disk emulator */ 264#define D_CHAIN 0x10 /* can do back-back transfers */ 265 266/* 267 * Drive data for SMD. 268 */ 269#define d_smdflags d_drivedata[0] 270#define D_SSE 0x1 /* supports skip sectoring */ 271#define d_mindist d_drivedata[1] 272#define d_maxdist d_drivedata[2] 273#define d_sdist d_drivedata[3] 274 275/* 276 * Drive data for ST506. 277 */ 278#define d_precompcyl d_drivedata[0] 279#define d_gap3 d_drivedata[1] /* used only when formatting */ 280 281/* 282 * Drive data for SCSI. 283 */ 284#define d_blind d_drivedata[0] 285 286#ifndef LOCORE 287/* 288 * Structure used to perform a format 289 * or other raw operation, returning data 290 * and/or register values. 291 * Register identification and format 292 * are device- and driver-dependent. 293 */ 294struct format_op { 295 char *df_buf; 296 int df_count; /* value-result */ 297 daddr_t df_startblk; 298 int df_reg[8]; /* result */ 299}; 300 301/* 302 * Structure used internally to retrieve 303 * information about a partition on a disk. 304 */ 305struct partinfo { 306 struct disklabel *disklab; 307 struct partition *part; 308}; 309 310/* DOS partition table -- located in boot block */ 311 312#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 313#define DOSPARTOFF 446 314#define NDOSPART 4 315#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 316 317struct dos_partition { 318 unsigned char dp_flag; /* bootstrap flags */ 319 unsigned char dp_shd; /* starting head */ 320 unsigned char dp_ssect; /* starting sector */ 321 unsigned char dp_scyl; /* starting cylinder */ 322 unsigned char dp_typ; /* partition type */ 323 unsigned char dp_ehd; /* end head */ 324 unsigned char dp_esect; /* end sector */ 325 unsigned char dp_ecyl; /* end cylinder */ 326 unsigned long dp_start; /* absolute starting sector number */ 327 unsigned long dp_size; /* partition size in sectors */ 328}; 329 330#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 331#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 332 333/* 334 * Disk-specific ioctls. 335 */ 336 /* get and set disklabel; DIOCGPART used internally */ 337#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 338#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 339#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 340#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 341 342/* do format operation, read or write */ 343#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 344#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 345 346#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 347#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 348#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 349 350#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 351#define DIOCSBADSCAN _IOW('d', 111, int) /* set badscan mode */ 352 353/* 354 * XXX encoding of disk minor numbers, should be elsewhere. 355 * 356 * See <sys/reboot.h> for a possibly better encoding. 357 * 358 * "cpio -H newc" can be used to back up device files with large minor 359 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 360 * don't have enough bits, and cpio and tar don't notice the lossage. 361 * There are also some sign extension bugs. 362 */ 363 364/* 365 3 2 1 0 366 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 0 367 _________________________________________________________________ 368 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 369 ----------------------------------------------------------------- 370 | TYPE | SLICE | MAJOR? | UNIT |PART | 371 ----------------------------------------------------------------- 372 | TYPE |PART2| SLICE | MAJOR? | UNIT |PART | <-soon 373 ----------------------------------------------------------------- 374 375 I want 3 more part bits (taken from 'TYPE' (useless as it is) (JRE) 376*/ 377#define dkmakeminor(unit, slice, part) \ 378 (((slice) << 16) | ((unit) << 3) | (part)) 379#define dkmodpart(dev, part) (((dev) & ~(dev_t)7) | (part)) 380#define dkmodslice(dev, slice) (((dev) & ~(dev_t)0x1f0000) | ((slice) << 16)) 381#define dkpart(dev) (minor(dev) & 7) 382#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 383#define dktype(dev) ((minor(dev) >> 21) & 0x7ff) 384#define dkunit(dev) ((minor(dev) >> 3) & 0x1f) 385 386#ifdef KERNEL 387/* 388 * We're not ready to use <sys/disk.h>. 389 */ 390#include <sys/conf.h> 391 392struct buf_queue_head; 393 394int bounds_check_with_label __P((struct buf *bp, struct disklabel *lp, 395 int wlabel)); 396void diskerr __P((struct buf *bp, char *dname, char *what, int pri, 397 int blkdone, struct disklabel *lp)); 398void disksort __P((struct buf *ap, struct buf *bp)); 399u_int dkcksum __P((struct disklabel *lp)); 400char *readdisklabel __P((dev_t dev, d_strategy_t *strat, 401 struct disklabel *lp)); 402void tqdisksort __P((struct buf_queue_head *ap, struct buf *bp)); 403int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 404 u_long openmask)); 405int writedisklabel __P((dev_t dev, d_strategy_t *strat, 406 struct disklabel *lp)); 407 408#endif /* KERNEL */ 409 410#endif /* LOCORE */ 411 412#if !defined(KERNEL) && !defined(LOCORE) 413 414#include <sys/cdefs.h> 415 416__BEGIN_DECLS 417struct disklabel *getdiskbyname __P((const char *)); 418__END_DECLS 419 420#endif 421 422#endif /* !_SYS_DISKLABEL_H_ */ 423