disklabel.h revision 37466
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 1.32 1998/06/07 17:12:58 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 1 66#define LABELOFFSET 0 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#if defined(KERNEL) || defined(STANDALONE) 102 char d_packname[16]; /* pack identifier */ 103#else 104 union { 105 char un_d_packname[16]; /* pack identifier */ 106 struct { 107 char *un_d_boot0; /* primary bootstrap name */ 108 char *un_d_boot1; /* secondary bootstrap name */ 109 } un_b; 110 } d_un; 111#define d_packname d_un.un_d_packname 112#define d_boot0 d_un.un_b.un_d_boot0 113#define d_boot1 d_un.un_b.un_d_boot1 114#endif /* ! KERNEL or STANDALONE */ 115 116 /* disk geometry: */ 117 u_int32_t d_secsize; /* # of bytes per sector */ 118 u_int32_t d_nsectors; /* # of data sectors per track */ 119 u_int32_t d_ntracks; /* # of tracks per cylinder */ 120 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 121 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 122 u_int32_t d_secperunit; /* # of data sectors per unit */ 123 124 /* 125 * Spares (bad sector replacements) below are not counted in 126 * d_nsectors or d_secpercyl. Spare sectors are assumed to 127 * be physical sectors which occupy space at the end of each 128 * track and/or cylinder. 129 */ 130 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 131 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 132 /* 133 * Alternate cylinders include maintenance, replacement, configuration 134 * description areas, etc. 135 */ 136 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 137 138 /* hardware characteristics: */ 139 /* 140 * d_interleave, d_trackskew and d_cylskew describe perturbations 141 * in the media format used to compensate for a slow controller. 142 * Interleave is physical sector interleave, set up by the 143 * formatter or controller when formatting. When interleaving is 144 * in use, logically adjacent sectors are not physically 145 * contiguous, but instead are separated by some number of 146 * sectors. It is specified as the ratio of physical sectors 147 * traversed per logical sector. Thus an interleave of 1:1 148 * implies contiguous layout, while 2:1 implies that logical 149 * sector 0 is separated by one sector from logical sector 1. 150 * d_trackskew is the offset of sector 0 on track N relative to 151 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 152 * is the offset of sector 0 on cylinder N relative to sector 0 153 * on cylinder N-1. 154 */ 155 u_int16_t d_rpm; /* rotational speed */ 156 u_int16_t d_interleave; /* hardware sector interleave */ 157 u_int16_t d_trackskew; /* sector 0 skew, per track */ 158 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 159 u_int32_t d_headswitch; /* head switch time, usec */ 160 u_int32_t d_trkseek; /* track-to-track seek, usec */ 161 u_int32_t d_flags; /* generic flags */ 162#define NDDATA 5 163 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 164#define NSPARE 5 165 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 166 u_int32_t d_magic2; /* the magic number (again) */ 167 u_int16_t d_checksum; /* xor of data incl. partitions */ 168 169 /* filesystem and partition information: */ 170 u_int16_t d_npartitions; /* number of partitions in following */ 171 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 172 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 173 struct partition { /* the partition table */ 174 u_int32_t p_size; /* number of sectors in partition */ 175 u_int32_t p_offset; /* starting sector */ 176 u_int32_t p_fsize; /* filesystem basic fragment size */ 177 u_int8_t p_fstype; /* filesystem type, see below */ 178 u_int8_t p_frag; /* filesystem fragments per block */ 179 union { 180 u_int16_t cpg; /* UFS: FS cylinders per group */ 181 u_int16_t sgs; /* LFS: FS segment shift */ 182 } __partition_u1; 183#define p_cpg __partition_u1.cpg 184#define p_sgs __partition_u1.sgs 185 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 186}; 187#else /* LOCORE */ 188 /* 189 * offsets for asm boot files. 190 */ 191 .set d_secsize,40 192 .set d_nsectors,44 193 .set d_ntracks,48 194 .set d_ncylinders,52 195 .set d_secpercyl,56 196 .set d_secperunit,60 197 .set d_end_,276 /* size of disk label */ 198#endif /* LOCORE */ 199 200/* d_type values: */ 201#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 202#define DTYPE_MSCP 2 /* MSCP */ 203#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 204#define DTYPE_SCSI 4 /* SCSI */ 205#define DTYPE_ESDI 5 /* ESDI interface */ 206#define DTYPE_ST506 6 /* ST506 etc. */ 207#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 208#define DTYPE_HPFL 8 /* HP Fiber-link */ 209#define DTYPE_FLOPPY 10 /* floppy */ 210#define DTYPE_CCD 11 /* concatenated disk */ 211#define DTYPE_VINUM 12 /* vinum volume */ 212 213#ifdef PC98 214#define DSTYPE_SEC256 0x80 /* physical sector size=256*/ 215#endif 216 217#ifdef DKTYPENAMES 218static char *dktypenames[] = { 219 "unknown", 220 "SMD", 221 "MSCP", 222 "old DEC", 223 "SCSI", 224 "ESDI", 225 "ST506", 226 "HP-IB", 227 "HP-FL", 228 "type 9", 229 "floppy", 230 "CCD", 231 "Vinum", 232 NULL 233}; 234#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 235#endif 236 237/* 238 * Filesystem type and version. 239 * Used to interpret other filesystem-specific 240 * per-partition information. 241 */ 242#define FS_UNUSED 0 /* unused */ 243#define FS_SWAP 1 /* swap */ 244#define FS_V6 2 /* Sixth Edition */ 245#define FS_V7 3 /* Seventh Edition */ 246#define FS_SYSV 4 /* System V */ 247#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 248#define FS_V8 6 /* Eighth Edition, 4K blocks */ 249#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 250#define FS_MSDOS 8 /* MSDOS file system */ 251#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 252#define FS_OTHER 10 /* in use, but unknown/unsupported */ 253#define FS_HPFS 11 /* OS/2 high-performance file system */ 254#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 255#define FS_BOOT 13 /* partition contains bootstrap */ 256 257#ifdef DKTYPENAMES 258static char *fstypenames[] = { 259 "unused", 260 "swap", 261 "Version 6", 262 "Version 7", 263 "System V", 264 "4.1BSD", 265 "Eighth Edition", 266 "4.2BSD", 267 "MSDOS", 268 "4.4LFS", 269 "unknown", 270 "HPFS", 271 "ISO9660", 272 "boot", 273 NULL 274}; 275#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 276#endif 277 278/* 279 * flags shared by various drives: 280 */ 281#define D_REMOVABLE 0x01 /* removable media */ 282#define D_ECC 0x02 /* supports ECC */ 283#define D_BADSECT 0x04 /* supports bad sector forw. */ 284#define D_RAMDISK 0x08 /* disk emulator */ 285#define D_CHAIN 0x10 /* can do back-back transfers */ 286 287/* 288 * Drive data for SMD. 289 */ 290#define d_smdflags d_drivedata[0] 291#define D_SSE 0x1 /* supports skip sectoring */ 292#define d_mindist d_drivedata[1] 293#define d_maxdist d_drivedata[2] 294#define d_sdist d_drivedata[3] 295 296/* 297 * Drive data for ST506. 298 */ 299#define d_precompcyl d_drivedata[0] 300#define d_gap3 d_drivedata[1] /* used only when formatting */ 301 302/* 303 * Drive data for SCSI. 304 */ 305#define d_blind d_drivedata[0] 306 307#ifndef LOCORE 308/* 309 * Structure used to perform a format or other raw operation, returning 310 * data and/or register values. Register identification and format 311 * are device- and driver-dependent. 312 */ 313struct format_op { 314 char *df_buf; 315 int df_count; /* value-result */ 316 daddr_t df_startblk; 317 int df_reg[8]; /* result */ 318}; 319 320/* 321 * Structure used internally to retrieve information about a partition 322 * on a disk. 323 */ 324struct partinfo { 325 struct disklabel *disklab; 326 struct partition *part; 327}; 328 329/* DOS partition table -- located in boot block */ 330 331#ifdef PC98 332#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 333#define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */ 334#define DOSPARTOFF 0 335#define NDOSPART 16 336#define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 337#define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */ 338 339struct dos_partition { 340 unsigned char dp_mid; 341#define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */ 342 unsigned char dp_sid; 343#define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */ 344 unsigned char dp_dum1; 345 unsigned char dp_dum2; 346 unsigned char dp_ipl_sct; 347 unsigned char dp_ipl_head; 348 unsigned short dp_ipl_cyl; 349 unsigned char dp_ssect; /* starting sector */ 350 unsigned char dp_shd; /* starting head */ 351 unsigned short dp_scyl; /* starting cylinder */ 352 unsigned char dp_esect; /* end sector */ 353 unsigned char dp_ehd; /* end head */ 354 unsigned short dp_ecyl; /* end cylinder */ 355 unsigned char dp_name[16]; 356}; 357 358#else /* IBMPC */ 359#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 360#define DOSPARTOFF 446 361#define NDOSPART 4 362#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 363 364struct dos_partition { 365 unsigned char dp_flag; /* bootstrap flags */ 366 unsigned char dp_shd; /* starting head */ 367 unsigned char dp_ssect; /* starting sector */ 368 unsigned char dp_scyl; /* starting cylinder */ 369 unsigned char dp_typ; /* partition type */ 370 unsigned char dp_ehd; /* end head */ 371 unsigned char dp_esect; /* end sector */ 372 unsigned char dp_ecyl; /* end cylinder */ 373 u_int32_t dp_start; /* absolute starting sector number */ 374 u_int32_t dp_size; /* partition size in sectors */ 375}; 376#endif 377 378#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 379#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 380 381/* 382 * Disk-specific ioctls. 383 */ 384 /* get and set disklabel; DIOCGPART used internally */ 385#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 386#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 387#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 388#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 389 390/* do format operation, read or write */ 391#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 392#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 393 394#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 395#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 396#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 397 398#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 399#define DIOCSBADSCAN _IOW('d', 111, int) /* set badscan mode */ 400 401/* 402 * XXX encoding of disk minor numbers, should be elsewhere. 403 * 404 * See <sys/reboot.h> for a possibly better encoding. 405 * 406 * "cpio -H newc" can be used to back up device files with large minor 407 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 408 * don't have enough bits, and cpio and tar don't notice the lossage. 409 * There are also some sign extension bugs. 410 */ 411 412/* 413 3 2 1 0 414 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 0 415 _________________________________________________________________ 416 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 417 ----------------------------------------------------------------- 418 | TYPE |UNIT_2 | SLICE | MAJOR? | UNIT |PART | 419 ----------------------------------------------------------------- 420*/ 421#define dkmakeminor(unit, slice, part) \ 422 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \ 423 (((unit) & 0x1f) << 3) | (part)) 424#define dkmodpart(dev, part) (((dev) & ~(dev_t)7) | (part)) 425#define dkmodslice(dev, slice) (((dev) & ~(dev_t)0x1f0000) | ((slice) << 16)) 426#define dkpart(dev) (minor(dev) & 7) 427#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 428#define dktype(dev) ((minor(dev) >> 25) & 0x7f) 429#define dkunit(dev) ((((dev) >> 16) & 0x1e0) | (((dev) >> 3) & 0x1f)) 430 431#ifdef KERNEL 432 433struct buf; 434struct buf_queue_head; 435 436int bounds_check_with_label __P((struct buf *bp, struct disklabel *lp, 437 int wlabel)); 438void diskerr __P((struct buf *bp, char *dname, char *what, int pri, 439 int blkdone, struct disklabel *lp)); 440void disksort __P((struct buf *ap, struct buf *bp)); 441u_int dkcksum __P((struct disklabel *lp)); 442char *readdisklabel __P((dev_t dev, void (*strat)(struct buf *bp), 443 struct disklabel *lp)); 444void bufqdisksort __P((struct buf_queue_head *ap, struct buf *bp)); 445int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 446 u_long openmask)); 447int writedisklabel __P((dev_t dev, void (*strat)(struct buf *bp), 448 struct disklabel *lp)); 449 450#endif /* KERNEL */ 451 452#endif /* LOCORE */ 453 454#ifndef KERNEL 455__BEGIN_DECLS 456struct disklabel *getdiskbyname __P((const char *)); 457__END_DECLS 458#endif 459 460#endif /* !_SYS_DISKLABEL_H_ */ 461