disklabel.h revision 5052
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 1.7 1994/10/31 06:31:14 phk 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/* 54 * XXX the following will go away when conversion to the slice version is 55 * complete: OURPART, RAWPART, readMSPtolabel, readMBRtolabel, dkminor, 56 * the DOSified readdisklabel, DOS stuff in this file. 57 */ 58 59/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 60#ifdef __i386__ 61#define LABELSECTOR 1 /* sector containing label */ 62#define LABELOFFSET 0 /* offset of label in sector */ 63#define OURPART 2 /* partition is 'all BSD' */ 64#define RAWPART 3 /* partition is 'all device' */ 65#define readMSPtolabel readMBRtolabel 66#endif 67 68#ifndef readMSPtolabel 69#define readMSPtolabel(a,b,c,d,e,) /* zap calls if irrelevant */ 70#endif 71 72#ifdef tahoe 73#define RAWPART 0 74#endif 75 76#ifndef RAWPART 77#define RAWPART 2 78#endif 79 80#ifndef OURPART 81#define OURPART RAWPART /* by default it's all ours */ 82#endif 83 84#ifndef LABELSECTOR 85#define LABELSECTOR 0 /* sector containing label */ 86#endif 87 88#ifndef LABELOFFSET 89#define LABELOFFSET 64 /* offset of label in sector */ 90#endif 91 92#define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */ 93#ifndef MAXPARTITIONS 94#define MAXPARTITIONS 8 95#endif 96 97#define LABEL_PART 2 /* partition containing label */ 98#define RAW_PART 2 /* partition containing whole disk */ 99#define SWAP_PART 1 /* partition normally containing swap */ 100 101#ifndef LOCORE 102struct disklabel { 103 u_long d_magic; /* the magic number */ 104 short d_type; /* drive type */ 105 short d_subtype; /* controller/d_type specific */ 106 char d_typename[16]; /* type name, e.g. "eagle" */ 107 /* 108 * d_packname contains the pack identifier and is returned when 109 * the disklabel is read off the disk or in-core copy. 110 * d_boot0 and d_boot1 are the (optional) names of the 111 * primary (block 0) and secondary (block 1-15) bootstraps 112 * as found in /usr/mdec. These are returned when using 113 * getdiskbyname(3) to retrieve the values from /etc/disktab. 114 */ 115#if defined(KERNEL) || defined(STANDALONE) 116 char d_packname[16]; /* pack identifier */ 117#else 118 union { 119 char un_d_packname[16]; /* pack identifier */ 120 struct { 121 char *un_d_boot0; /* primary bootstrap name */ 122 char *un_d_boot1; /* secondary bootstrap name */ 123 } un_b; 124 } d_un; 125#define d_packname d_un.un_d_packname 126#define d_boot0 d_un.un_b.un_d_boot0 127#define d_boot1 d_un.un_b.un_d_boot1 128#endif /* ! KERNEL or STANDALONE */ 129 /* disk geometry: */ 130 u_long d_secsize; /* # of bytes per sector */ 131 u_long d_nsectors; /* # of data sectors per track */ 132 u_long d_ntracks; /* # of tracks per cylinder */ 133 u_long d_ncylinders; /* # of data cylinders per unit */ 134 u_long d_secpercyl; /* # of data sectors per cylinder */ 135 u_long d_secperunit; /* # of data sectors per unit */ 136 /* 137 * Spares (bad sector replacements) below 138 * are not counted in d_nsectors or d_secpercyl. 139 * Spare sectors are assumed to be physical sectors 140 * which occupy space at the end of each track and/or cylinder. 141 */ 142 u_short d_sparespertrack; /* # of spare sectors per track */ 143 u_short d_sparespercyl; /* # of spare sectors per cylinder */ 144 /* 145 * Alternate cylinders include maintenance, replacement, 146 * configuration description areas, etc. 147 */ 148 u_long d_acylinders; /* # of alt. cylinders per unit */ 149 150 /* hardware characteristics: */ 151 /* 152 * d_interleave, d_trackskew and d_cylskew describe perturbations 153 * in the media format used to compensate for a slow controller. 154 * Interleave is physical sector interleave, set up by the formatter 155 * or controller when formatting. When interleaving is in use, 156 * logically adjacent sectors are not physically contiguous, 157 * but instead are separated by some number of sectors. 158 * It is specified as the ratio of physical sectors traversed 159 * per logical sector. Thus an interleave of 1:1 implies contiguous 160 * layout, while 2:1 implies that logical sector 0 is separated 161 * by one sector from logical sector 1. 162 * d_trackskew is the offset of sector 0 on track N 163 * relative to sector 0 on track N-1 on the same cylinder. 164 * Finally, d_cylskew is the offset of sector 0 on cylinder N 165 * relative to sector 0 on cylinder N-1. 166 */ 167 u_short d_rpm; /* rotational speed */ 168 u_short d_interleave; /* hardware sector interleave */ 169 u_short d_trackskew; /* sector 0 skew, per track */ 170 u_short d_cylskew; /* sector 0 skew, per cylinder */ 171 u_long d_headswitch; /* head switch time, usec */ 172 u_long d_trkseek; /* track-to-track seek, usec */ 173 u_long d_flags; /* generic flags */ 174#define NDDATA 5 175 u_long d_drivedata[NDDATA]; /* drive-type specific information */ 176#define NSPARE 5 177 u_long d_spare[NSPARE]; /* reserved for future use */ 178 u_long d_magic2; /* the magic number (again) */ 179 u_short d_checksum; /* xor of data incl. partitions */ 180 181 /* filesystem and partition information: */ 182 u_short d_npartitions; /* number of partitions in following */ 183 u_long d_bbsize; /* size of boot area at sn0, bytes */ 184 u_long d_sbsize; /* max size of fs superblock, bytes */ 185 struct partition { /* the partition table */ 186 u_long p_size; /* number of sectors in partition */ 187 u_long p_offset; /* starting sector */ 188 u_long p_fsize; /* filesystem basic fragment size */ 189 u_char p_fstype; /* filesystem type, see below */ 190 u_char p_frag; /* filesystem fragments per block */ 191 union { 192 u_short cpg; /* UFS: FS cylinders per group */ 193 u_short sgs; /* LFS: FS segment shift */ 194 } __partition_u1; 195#define p_cpg __partition_u1.cpg 196#define p_sgs __partition_u1.sgs 197 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 198}; 199struct cpu_disklabel { 200}; 201#else /* LOCORE */ 202 /* 203 * offsets for asm boot files. 204 */ 205 .set d_secsize,40 206 .set d_nsectors,44 207 .set d_ntracks,48 208 .set d_ncylinders,52 209 .set d_secpercyl,56 210 .set d_secperunit,60 211 .set d_end_,276 /* size of disk label */ 212#endif /* LOCORE */ 213 214/* d_type values: */ 215#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 216#define DTYPE_MSCP 2 /* MSCP */ 217#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 218#define DTYPE_SCSI 4 /* SCSI */ 219#define DTYPE_ESDI 5 /* ESDI interface */ 220#define DTYPE_ST506 6 /* ST506 etc. */ 221#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 222#define DTYPE_HPFL 8 /* HP Fiber-link */ 223#define DTYPE_FLOPPY 10 /* floppy */ 224 225/* d_subtype values: */ 226#define DSTYPE_INDOSPART 0x8 /* is inside dos partition */ 227#define DSTYPE_DOSPART(s) ((s) & 3) /* dos partition number */ 228#define DSTYPE_GEOMETRY 0x10 /* drive params in label */ 229 230#ifdef DKTYPENAMES 231static char *dktypenames[] = { 232 "unknown", 233 "SMD", 234 "MSCP", 235 "old DEC", 236 "SCSI", 237 "ESDI", 238 "ST506", 239 "HP-IB", 240 "HP-FL", 241 "type 9", 242 "floppy", 243 0 244}; 245#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 246#endif 247 248/* 249 * Filesystem type and version. 250 * Used to interpret other filesystem-specific 251 * per-partition information. 252 */ 253#define FS_UNUSED 0 /* unused */ 254#define FS_SWAP 1 /* swap */ 255#define FS_V6 2 /* Sixth Edition */ 256#define FS_V7 3 /* Seventh Edition */ 257#define FS_SYSV 4 /* System V */ 258#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 259#define FS_V8 6 /* Eighth Edition, 4K blocks */ 260#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 261#define FS_MSDOS 8 /* MSDOS file system */ 262#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 263#define FS_OTHER 10 /* in use, but unknown/unsupported */ 264#define FS_HPFS 11 /* OS/2 high-performance file system */ 265#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 266#define FS_BOOT 13 /* partition contains bootstrap */ 267 268#ifdef DKTYPENAMES 269static char *fstypenames[] = { 270 "unused", 271 "swap", 272 "Version 6", 273 "Version 7", 274 "System V", 275 "4.1BSD", 276 "Eighth Edition", 277 "4.2BSD", 278 "MSDOS", 279 "4.4LFS", 280 "unknown", 281 "HPFS", 282 "ISO9660", 283 "boot", 284 0 285}; 286#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 287#endif 288 289/* 290 * flags shared by various drives: 291 */ 292#define D_REMOVABLE 0x01 /* removable media */ 293#define D_ECC 0x02 /* supports ECC */ 294#define D_BADSECT 0x04 /* supports bad sector forw. */ 295#define D_RAMDISK 0x08 /* disk emulator */ 296#define D_CHAIN 0x10 /* can do back-back transfers */ 297 298/* 299 * Drive data for SMD. 300 */ 301#define d_smdflags d_drivedata[0] 302#define D_SSE 0x1 /* supports skip sectoring */ 303#define d_mindist d_drivedata[1] 304#define d_maxdist d_drivedata[2] 305#define d_sdist d_drivedata[3] 306 307/* 308 * Drive data for ST506. 309 */ 310#define d_precompcyl d_drivedata[0] 311#define d_gap3 d_drivedata[1] /* used only when formatting */ 312 313/* 314 * Drive data for SCSI. 315 */ 316#define d_blind d_drivedata[0] 317 318#ifndef LOCORE 319/* 320 * Structure used to perform a format 321 * or other raw operation, returning data 322 * and/or register values. 323 * Register identification and format 324 * are device- and driver-dependent. 325 */ 326struct format_op { 327 char *df_buf; 328 int df_count; /* value-result */ 329 daddr_t df_startblk; 330 int df_reg[8]; /* result */ 331}; 332 333/* 334 * Structure used internally to retrieve 335 * information about a partition on a disk. 336 */ 337struct partinfo { 338 struct disklabel *disklab; 339 struct partition *part; 340}; 341 342/* DOS partition table -- located in boot block */ 343 344#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 345#define DOSPARTOFF 446 346#define NDOSPART 4 347#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 348#define MBR_PTYPE_FreeBSD 0xa5 /* FreeBSD partition type */ 349 350struct dos_partition { 351 unsigned char dp_flag; /* bootstrap flags */ 352 unsigned char dp_shd; /* starting head */ 353 unsigned char dp_ssect; /* starting sector */ 354 unsigned char dp_scyl; /* starting cylinder */ 355 unsigned char dp_typ; /* partition type */ 356 unsigned char dp_ehd; /* end head */ 357 unsigned char dp_esect; /* end sector */ 358 unsigned char dp_ecyl; /* end cylinder */ 359 unsigned long dp_start; /* absolute starting sector number */ 360 unsigned long dp_size; /* partition size in sectors */ 361}; 362 363extern struct dos_partition dos_partitions[NDOSPART]; 364 365#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 366#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 367 368/* 369 * Disk-specific ioctls. 370 */ 371 /* get and set disklabel; DIOCGPART used internally */ 372#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 373#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 374#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 375#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 376 377/* do format operation, read or write */ 378#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 379#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 380 381#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 382#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 383#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 384 385#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 386 387/* 388 * XXX encoding of disk minor numbers, should be elsewhere. 389 * 390 * See <sys/reboot.h> for a possibly better encoding. 391 * 392 * "cpio -H newc" can be used to back up device files with large minor 393 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 394 * don't have enough bits, and cpio and tar don't notice the lossage. 395 * There are also some sign extension bugs. 396 */ 397#define dkmakeminor(unit, slice, part) \ 398 (((slice) << 16) | ((unit) << 3) | (part)) 399#define dkminor(unit, part) dkmakeminor((unit), 0, (part)) 400#define dkmodpart(dev, part) (((dev) & ~(dev_t)7) | (part)) 401#define dkmodslice(dev, slice) (((dev) & ~(dev_t)0x1f0000) | ((slice) << 16)) 402#define dkpart(dev) (minor(dev) & 7) 403#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 404#define dktype(dev) ((minor(dev) >> 21) & 0x7ff) 405#define dkunit(dev) ((minor(dev) >> 3) & 0x1f) 406 407#ifdef KERNEL 408/* 409 * We're not ready to use <sys/disk.h>. 410 */ 411#include <sys/conf.h> 412 413char *correct_readdisklabel __P((dev_t dev, d_strategy_t *strat, 414 struct disklabel *lp)); 415void diskerr __P((struct buf *bp, char *dname, char *what, int pri, 416 int blkdone, struct disklabel *lp)); 417void disksort __P((struct buf *ap, struct buf *bp)); 418u_int dkcksum __P((struct disklabel *lp)); 419struct dkbad; 420char *readdisklabel __P((dev_t dev, d_strategy_t *strat, 421 struct disklabel *lp, 422 struct dos_partition *dp, struct dkbad *bdp)); 423#ifdef __i386__ 424char *readMBRtolabel __P((dev_t dev, d_strategy_t *strat, 425 struct disklabel *lp, struct dos_partition *dp, 426 int *cyl)); 427#endif 428int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 429 u_long openmask)); 430int writedisklabel __P((dev_t dev, d_strategy_t *strat, 431 struct disklabel *lp)); 432 433#endif /* KERNEL */ 434 435#endif /* LOCORE */ 436 437#if !defined(KERNEL) && !defined(LOCORE) 438 439#include <sys/cdefs.h> 440 441__BEGIN_DECLS 442struct disklabel *getdiskbyname __P((const char *)); 443__END_DECLS 444 445#endif 446 447#endif /* !_SYS_DISKLABEL_H_ */ 448