disklabel.h revision 38518
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 1.34 1998/07/12 16:48:08 dfr Exp $ 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#define DISKTAB "/etc/disktab" /* deprecated */ 50 51/* 52 * Each disk has a label which includes information about the hardware 53 * disk geometry, filesystem partitions, and drive specific information. 54 * The label is in block 0 or 1, possibly offset from the beginning 55 * to leave room for a bootstrap, etc. 56 */ 57 58/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 59#ifdef __i386__ 60#define LABELSECTOR 1 /* sector containing label */ 61#define LABELOFFSET 0 /* offset of label in sector */ 62#endif 63 64#ifdef __alpha__ 65#define LABELSECTOR 0 66#define LABELOFFSET 64 67#endif 68 69#ifndef LABELSECTOR 70#define LABELSECTOR 0 /* sector containing label */ 71#endif 72 73#ifndef LABELOFFSET 74#define LABELOFFSET 64 /* offset of label in sector */ 75#endif 76 77#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 78#ifndef MAXPARTITIONS 79#define MAXPARTITIONS 8 80#endif 81 82#define LABEL_PART 2 /* partition containing label */ 83#define RAW_PART 2 /* partition containing whole disk */ 84#define SWAP_PART 1 /* partition normally containing swap */ 85 86#ifndef LOCORE 87struct disklabel { 88 u_int32_t d_magic; /* the magic number */ 89 u_int16_t d_type; /* drive type */ 90 u_int16_t d_subtype; /* controller/d_type specific */ 91 char d_typename[16]; /* type name, e.g. "eagle" */ 92 93 /* 94 * d_packname contains the pack identifier and is returned when 95 * the disklabel is read off the disk or in-core copy. 96 * d_boot0 and d_boot1 are the (optional) names of the 97 * primary (block 0) and secondary (block 1-15) bootstraps 98 * as found in /usr/mdec. These are returned when using 99 * getdiskbyname(3) to retrieve the values from /etc/disktab. 100 */ 101 union { 102 char un_d_packname[16]; /* pack identifier */ 103 struct { 104 char *un_d_boot0; /* primary bootstrap name */ 105 char *un_d_boot1; /* secondary bootstrap name */ 106 } un_b; 107 } d_un; 108#define d_packname d_un.un_d_packname 109#define d_boot0 d_un.un_b.un_d_boot0 110#define d_boot1 d_un.un_b.un_d_boot1 111 112 /* disk geometry: */ 113 u_int32_t d_secsize; /* # of bytes per sector */ 114 u_int32_t d_nsectors; /* # of data sectors per track */ 115 u_int32_t d_ntracks; /* # of tracks per cylinder */ 116 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 117 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 118 u_int32_t d_secperunit; /* # of data sectors per unit */ 119 120 /* 121 * Spares (bad sector replacements) below are not counted in 122 * d_nsectors or d_secpercyl. Spare sectors are assumed to 123 * be physical sectors which occupy space at the end of each 124 * track and/or cylinder. 125 */ 126 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 127 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 128 /* 129 * Alternate cylinders include maintenance, replacement, configuration 130 * description areas, etc. 131 */ 132 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 133 134 /* hardware characteristics: */ 135 /* 136 * d_interleave, d_trackskew and d_cylskew describe perturbations 137 * in the media format used to compensate for a slow controller. 138 * Interleave is physical sector interleave, set up by the 139 * formatter or controller when formatting. When interleaving is 140 * in use, logically adjacent sectors are not physically 141 * contiguous, but instead are separated by some number of 142 * sectors. It is specified as the ratio of physical sectors 143 * traversed per logical sector. Thus an interleave of 1:1 144 * implies contiguous layout, while 2:1 implies that logical 145 * sector 0 is separated by one sector from logical sector 1. 146 * d_trackskew is the offset of sector 0 on track N relative to 147 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 148 * is the offset of sector 0 on cylinder N relative to sector 0 149 * on cylinder N-1. 150 */ 151 u_int16_t d_rpm; /* rotational speed */ 152 u_int16_t d_interleave; /* hardware sector interleave */ 153 u_int16_t d_trackskew; /* sector 0 skew, per track */ 154 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 155 u_int32_t d_headswitch; /* head switch time, usec */ 156 u_int32_t d_trkseek; /* track-to-track seek, usec */ 157 u_int32_t d_flags; /* generic flags */ 158#define NDDATA 5 159 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 160#define NSPARE 5 161 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 162 u_int32_t d_magic2; /* the magic number (again) */ 163 u_int16_t d_checksum; /* xor of data incl. partitions */ 164 165 /* filesystem and partition information: */ 166 u_int16_t d_npartitions; /* number of partitions in following */ 167 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 168 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 169 struct partition { /* the partition table */ 170 u_int32_t p_size; /* number of sectors in partition */ 171 u_int32_t p_offset; /* starting sector */ 172 u_int32_t p_fsize; /* filesystem basic fragment size */ 173 u_int8_t p_fstype; /* filesystem type, see below */ 174 u_int8_t p_frag; /* filesystem fragments per block */ 175 union { 176 u_int16_t cpg; /* UFS: FS cylinders per group */ 177 u_int16_t sgs; /* LFS: FS segment shift */ 178 } __partition_u1; 179#define p_cpg __partition_u1.cpg 180#define p_sgs __partition_u1.sgs 181 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 182}; 183#else /* LOCORE */ 184 /* 185 * offsets for asm boot files. 186 */ 187 .set d_secsize,40 188 .set d_nsectors,44 189 .set d_ntracks,48 190 .set d_ncylinders,52 191 .set d_secpercyl,56 192 .set d_secperunit,60 193 .set d_end_,276 /* size of disk label */ 194#endif /* LOCORE */ 195 196/* d_type values: */ 197#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 198#define DTYPE_MSCP 2 /* MSCP */ 199#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 200#define DTYPE_SCSI 4 /* SCSI */ 201#define DTYPE_ESDI 5 /* ESDI interface */ 202#define DTYPE_ST506 6 /* ST506 etc. */ 203#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 204#define DTYPE_HPFL 8 /* HP Fiber-link */ 205#define DTYPE_FLOPPY 10 /* floppy */ 206#define DTYPE_CCD 11 /* concatenated disk */ 207#define DTYPE_VINUM 12 /* vinum volume */ 208 209#ifdef PC98 210#define DSTYPE_SEC256 0x80 /* physical sector size=256*/ 211#endif 212 213#ifdef DKTYPENAMES 214static char *dktypenames[] = { 215 "unknown", 216 "SMD", 217 "MSCP", 218 "old DEC", 219 "SCSI", 220 "ESDI", 221 "ST506", 222 "HP-IB", 223 "HP-FL", 224 "type 9", 225 "floppy", 226 "CCD", 227 "Vinum", 228 NULL 229}; 230#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 231#endif 232 233/* 234 * Filesystem type and version. 235 * Used to interpret other filesystem-specific 236 * per-partition information. 237 */ 238#define FS_UNUSED 0 /* unused */ 239#define FS_SWAP 1 /* swap */ 240#define FS_V6 2 /* Sixth Edition */ 241#define FS_V7 3 /* Seventh Edition */ 242#define FS_SYSV 4 /* System V */ 243#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 244#define FS_V8 6 /* Eighth Edition, 4K blocks */ 245#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 246#define FS_MSDOS 8 /* MSDOS file system */ 247#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 248#define FS_OTHER 10 /* in use, but unknown/unsupported */ 249#define FS_HPFS 11 /* OS/2 high-performance file system */ 250#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 251#define FS_BOOT 13 /* partition contains bootstrap */ 252 253#ifdef DKTYPENAMES 254static 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 NULL 270}; 271#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 272#endif 273 274/* 275 * flags shared by various drives: 276 */ 277#define D_REMOVABLE 0x01 /* removable media */ 278#define D_ECC 0x02 /* supports ECC */ 279#define D_BADSECT 0x04 /* supports bad sector forw. */ 280#define D_RAMDISK 0x08 /* disk emulator */ 281#define D_CHAIN 0x10 /* can do back-back transfers */ 282 283/* 284 * Drive data for SMD. 285 */ 286#define d_smdflags d_drivedata[0] 287#define D_SSE 0x1 /* supports skip sectoring */ 288#define d_mindist d_drivedata[1] 289#define d_maxdist d_drivedata[2] 290#define d_sdist d_drivedata[3] 291 292/* 293 * Drive data for ST506. 294 */ 295#define d_precompcyl d_drivedata[0] 296#define d_gap3 d_drivedata[1] /* used only when formatting */ 297 298/* 299 * Drive data for SCSI. 300 */ 301#define d_blind d_drivedata[0] 302 303#ifndef LOCORE 304/* 305 * Structure used to perform a format or other raw operation, returning 306 * data and/or register values. Register identification and format 307 * are device- and driver-dependent. 308 */ 309struct format_op { 310 char *df_buf; 311 int df_count; /* value-result */ 312 daddr_t df_startblk; 313 int df_reg[8]; /* result */ 314}; 315 316/* 317 * Structure used internally to retrieve information about a partition 318 * on a disk. 319 */ 320struct partinfo { 321 struct disklabel *disklab; 322 struct partition *part; 323}; 324 325/* DOS partition table -- located in boot block */ 326 327#ifdef PC98 328#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 329#define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */ 330#define DOSPARTOFF 0 331#define NDOSPART 16 332#define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 333#define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */ 334 335struct dos_partition { 336 unsigned char dp_mid; 337#define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */ 338 unsigned char dp_sid; 339#define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */ 340 unsigned char dp_dum1; 341 unsigned char dp_dum2; 342 unsigned char dp_ipl_sct; 343 unsigned char dp_ipl_head; 344 unsigned short dp_ipl_cyl; 345 unsigned char dp_ssect; /* starting sector */ 346 unsigned char dp_shd; /* starting head */ 347 unsigned short dp_scyl; /* starting cylinder */ 348 unsigned char dp_esect; /* end sector */ 349 unsigned char dp_ehd; /* end head */ 350 unsigned short dp_ecyl; /* end cylinder */ 351 unsigned char dp_name[16]; 352}; 353 354#else /* IBMPC */ 355#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 356#define DOSPARTOFF 446 357#define NDOSPART 4 358#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 359 360struct dos_partition { 361 unsigned char dp_flag; /* bootstrap flags */ 362 unsigned char dp_shd; /* starting head */ 363 unsigned char dp_ssect; /* starting sector */ 364 unsigned char dp_scyl; /* starting cylinder */ 365 unsigned char dp_typ; /* partition type */ 366 unsigned char dp_ehd; /* end head */ 367 unsigned char dp_esect; /* end sector */ 368 unsigned char dp_ecyl; /* end cylinder */ 369 u_int32_t dp_start; /* absolute starting sector number */ 370 u_int32_t dp_size; /* partition size in sectors */ 371}; 372#endif 373 374#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 375#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 376 377/* 378 * Disk-specific ioctls. 379 */ 380 /* get and set disklabel; DIOCGPART used internally */ 381#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 382#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 383#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 384#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 385 386/* do format operation, read or write */ 387#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 388#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 389 390#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 391#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 392#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 393 394#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 395#define DIOCSBADSCAN _IOW('d', 111, int) /* set badscan mode */ 396 397/* 398 * XXX encoding of disk minor numbers, should be elsewhere. 399 * 400 * See <sys/reboot.h> for a possibly better encoding. 401 * 402 * "cpio -H newc" can be used to back up device files with large minor 403 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 404 * don't have enough bits, and cpio and tar don't notice the lossage. 405 * There are also some sign extension bugs. 406 */ 407 408/* 409 3 2 1 0 410 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 0 411 _________________________________________________________________ 412 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 413 ----------------------------------------------------------------- 414 | TYPE |UNIT_2 | SLICE | MAJOR? | UNIT |PART | 415 ----------------------------------------------------------------- 416*/ 417#define dkmakeminor(unit, slice, part) \ 418 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \ 419 (((unit) & 0x1f) << 3) | (part)) 420#define dkmodpart(dev, part) (((dev) & ~(dev_t)7) | (part)) 421#define dkmodslice(dev, slice) (((dev) & ~(dev_t)0x1f0000) | ((slice) << 16)) 422#define dkpart(dev) (minor(dev) & 7) 423#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 424#define dktype(dev) ((minor(dev) >> 25) & 0x7f) 425#define dkunit(dev) ((((dev) >> 16) & 0x1e0) | (((dev) >> 3) & 0x1f)) 426 427#ifdef KERNEL 428 429struct buf; 430struct buf_queue_head; 431 432int bounds_check_with_label __P((struct buf *bp, struct disklabel *lp, 433 int wlabel)); 434void diskerr __P((struct buf *bp, char *dname, char *what, int pri, 435 int blkdone, struct disklabel *lp)); 436void disksort __P((struct buf *ap, struct buf *bp)); 437u_int dkcksum __P((struct disklabel *lp)); 438char *readdisklabel __P((dev_t dev, void (*strat)(struct buf *bp), 439 struct disklabel *lp)); 440void bufqdisksort __P((struct buf_queue_head *ap, struct buf *bp)); 441int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 442 u_long openmask)); 443int writedisklabel __P((dev_t dev, void (*strat)(struct buf *bp), 444 struct disklabel *lp)); 445 446#endif /* KERNEL */ 447 448#endif /* LOCORE */ 449 450#ifndef KERNEL 451__BEGIN_DECLS 452struct disklabel *getdiskbyname __P((const char *)); 453__END_DECLS 454#endif 455 456#endif /* !_SYS_DISKLABEL_H_ */ 457