disklabel.h revision 18444
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 1.23 1996/09/20 17:39:32 bde 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#ifndef LABELSECTOR 65#define LABELSECTOR 0 /* sector containing label */ 66#endif 67 68#ifndef LABELOFFSET 69#define LABELOFFSET 64 /* offset of label in sector */ 70#endif 71 72#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 73#ifndef MAXPARTITIONS 74#define MAXPARTITIONS 8 75#endif 76 77#define LABEL_PART 2 /* partition containing label */ 78#define RAW_PART 2 /* partition containing whole disk */ 79#define SWAP_PART 1 /* partition normally containing swap */ 80 81#ifndef LOCORE 82struct disklabel { 83 u_int32_t d_magic; /* the magic number */ 84 u_int16_t d_type; /* drive type */ 85 u_int16_t d_subtype; /* controller/d_type specific */ 86 char d_typename[16]; /* type name, e.g. "eagle" */ 87 88 /* 89 * d_packname contains the pack identifier and is returned when 90 * the disklabel is read off the disk or in-core copy. 91 * d_boot0 and d_boot1 are the (optional) names of the 92 * primary (block 0) and secondary (block 1-15) bootstraps 93 * as found in /usr/mdec. These are returned when using 94 * getdiskbyname(3) to retrieve the values from /etc/disktab. 95 */ 96#if defined(KERNEL) || defined(STANDALONE) 97 char d_packname[16]; /* pack identifier */ 98#else 99 union { 100 char un_d_packname[16]; /* pack identifier */ 101 struct { 102 char *un_d_boot0; /* primary bootstrap name */ 103 char *un_d_boot1; /* secondary bootstrap name */ 104 } un_b; 105 } d_un; 106#define d_packname d_un.un_d_packname 107#define d_boot0 d_un.un_b.un_d_boot0 108#define d_boot1 d_un.un_b.un_d_boot1 109#endif /* ! KERNEL or STANDALONE */ 110 111 /* disk geometry: */ 112 u_int32_t d_secsize; /* # of bytes per sector */ 113 u_int32_t d_nsectors; /* # of data sectors per track */ 114 u_int32_t d_ntracks; /* # of tracks per cylinder */ 115 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 116 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 117 u_int32_t d_secperunit; /* # of data sectors per unit */ 118 119 /* 120 * Spares (bad sector replacements) below are not counted in 121 * d_nsectors or d_secpercyl. Spare sectors are assumed to 122 * be physical sectors which occupy space at the end of each 123 * track and/or cylinder. 124 */ 125 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 126 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 127 /* 128 * Alternate cylinders include maintenance, replacement, configuration 129 * description areas, etc. 130 */ 131 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 132 133 /* hardware characteristics: */ 134 /* 135 * d_interleave, d_trackskew and d_cylskew describe perturbations 136 * in the media format used to compensate for a slow controller. 137 * Interleave is physical sector interleave, set up by the 138 * formatter or controller when formatting. When interleaving is 139 * in use, logically adjacent sectors are not physically 140 * contiguous, but instead are separated by some number of 141 * sectors. It is specified as the ratio of physical sectors 142 * traversed per logical sector. Thus an interleave of 1:1 143 * implies contiguous layout, while 2:1 implies that logical 144 * sector 0 is separated by one sector from logical sector 1. 145 * d_trackskew is the offset of sector 0 on track N relative to 146 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 147 * is the offset of sector 0 on cylinder N relative to sector 0 148 * on cylinder N-1. 149 */ 150 u_int16_t d_rpm; /* rotational speed */ 151 u_int16_t d_interleave; /* hardware sector interleave */ 152 u_int16_t d_trackskew; /* sector 0 skew, per track */ 153 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 154 u_int32_t d_headswitch; /* head switch time, usec */ 155 u_int32_t d_trkseek; /* track-to-track seek, usec */ 156 u_int32_t d_flags; /* generic flags */ 157#define NDDATA 5 158 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 159#define NSPARE 5 160 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 161 u_int32_t d_magic2; /* the magic number (again) */ 162 u_int16_t d_checksum; /* xor of data incl. partitions */ 163 164 /* filesystem and partition information: */ 165 u_int16_t d_npartitions; /* number of partitions in following */ 166 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 167 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 168 struct partition { /* the partition table */ 169 u_int32_t p_size; /* number of sectors in partition */ 170 u_int32_t p_offset; /* starting sector */ 171 u_int32_t p_fsize; /* filesystem basic fragment size */ 172 u_int8_t p_fstype; /* filesystem type, see below */ 173 u_int8_t p_frag; /* filesystem fragments per block */ 174 union { 175 u_int16_t cpg; /* UFS: FS cylinders per group */ 176 u_int16_t sgs; /* LFS: FS segment shift */ 177 } __partition_u1; 178#define p_cpg __partition_u1.cpg 179#define p_sgs __partition_u1.sgs 180 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 181}; 182#else /* LOCORE */ 183 /* 184 * offsets for asm boot files. 185 */ 186 .set d_secsize,40 187 .set d_nsectors,44 188 .set d_ntracks,48 189 .set d_ncylinders,52 190 .set d_secpercyl,56 191 .set d_secperunit,60 192 .set d_end_,276 /* size of disk label */ 193#endif /* LOCORE */ 194 195/* d_type values: */ 196#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 197#define DTYPE_MSCP 2 /* MSCP */ 198#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 199#define DTYPE_SCSI 4 /* SCSI */ 200#define DTYPE_ESDI 5 /* ESDI interface */ 201#define DTYPE_ST506 6 /* ST506 etc. */ 202#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 203#define DTYPE_HPFL 8 /* HP Fiber-link */ 204#define DTYPE_FLOPPY 10 /* floppy */ 205#define DTYPE_CCD 11 /* concatenated disk */ 206 207#ifdef PC98 208#define DSTYPE_SEC256 0x80 /* physical sector size=256*/ 209#endif 210 211#ifdef DKTYPENAMES 212static char *dktypenames[] = { 213 "unknown", 214 "SMD", 215 "MSCP", 216 "old DEC", 217 "SCSI", 218 "ESDI", 219 "ST506", 220 "HP-IB", 221 "HP-FL", 222 "type 9", 223 "floppy", 224 "CCD", 225 NULL 226}; 227#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 228#endif 229 230/* 231 * Filesystem type and version. 232 * Used to interpret other filesystem-specific 233 * per-partition information. 234 */ 235#define FS_UNUSED 0 /* unused */ 236#define FS_SWAP 1 /* swap */ 237#define FS_V6 2 /* Sixth Edition */ 238#define FS_V7 3 /* Seventh Edition */ 239#define FS_SYSV 4 /* System V */ 240#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 241#define FS_V8 6 /* Eighth Edition, 4K blocks */ 242#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 243#define FS_MSDOS 8 /* MSDOS file system */ 244#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 245#define FS_OTHER 10 /* in use, but unknown/unsupported */ 246#define FS_HPFS 11 /* OS/2 high-performance file system */ 247#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 248#define FS_BOOT 13 /* partition contains bootstrap */ 249 250#ifdef DKTYPENAMES 251static char *fstypenames[] = { 252 "unused", 253 "swap", 254 "Version 6", 255 "Version 7", 256 "System V", 257 "4.1BSD", 258 "Eighth Edition", 259 "4.2BSD", 260 "MSDOS", 261 "4.4LFS", 262 "unknown", 263 "HPFS", 264 "ISO9660", 265 "boot", 266 NULL 267}; 268#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 269#endif 270 271/* 272 * flags shared by various drives: 273 */ 274#define D_REMOVABLE 0x01 /* removable media */ 275#define D_ECC 0x02 /* supports ECC */ 276#define D_BADSECT 0x04 /* supports bad sector forw. */ 277#define D_RAMDISK 0x08 /* disk emulator */ 278#define D_CHAIN 0x10 /* can do back-back transfers */ 279 280/* 281 * Drive data for SMD. 282 */ 283#define d_smdflags d_drivedata[0] 284#define D_SSE 0x1 /* supports skip sectoring */ 285#define d_mindist d_drivedata[1] 286#define d_maxdist d_drivedata[2] 287#define d_sdist d_drivedata[3] 288 289/* 290 * Drive data for ST506. 291 */ 292#define d_precompcyl d_drivedata[0] 293#define d_gap3 d_drivedata[1] /* used only when formatting */ 294 295/* 296 * Drive data for SCSI. 297 */ 298#define d_blind d_drivedata[0] 299 300#ifndef LOCORE 301/* 302 * Structure used to perform a format or other raw operation, returning 303 * data and/or register values. Register identification and format 304 * are device- and driver-dependent. 305 */ 306struct format_op { 307 char *df_buf; 308 int df_count; /* value-result */ 309 daddr_t df_startblk; 310 int df_reg[8]; /* result */ 311}; 312 313/* 314 * Structure used internally to retrieve information about a partition 315 * on a disk. 316 */ 317struct partinfo { 318 struct disklabel *disklab; 319 struct partition *part; 320}; 321 322/* DOS partition table -- located in boot block */ 323 324#ifdef PC98 325#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 326#define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */ 327#define DOSPARTOFF 0 328#define NDOSPART 16 329#define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 330#define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */ 331 332struct dos_partition { 333 unsigned char dp_mid; 334#define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */ 335 unsigned char dp_sid; 336#define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */ 337 unsigned char dp_dum1; 338 unsigned char dp_dum2; 339 unsigned char dp_ipl_sct; 340 unsigned char dp_ipl_head; 341 unsigned short dp_ipl_cyl; 342 unsigned char dp_ssect; /* starting sector */ 343 unsigned char dp_shd; /* starting head */ 344 unsigned short dp_scyl; /* starting cylinder */ 345 unsigned char dp_esect; /* end sector */ 346 unsigned char dp_ehd; /* end head */ 347 unsigned short dp_ecyl; /* end cylinder */ 348 unsigned char dp_name[16]; 349}; 350 351#else /* IBMPC */ 352#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 353#define DOSPARTOFF 446 354#define NDOSPART 4 355#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 356 357struct dos_partition { 358 unsigned char dp_flag; /* bootstrap flags */ 359 unsigned char dp_shd; /* starting head */ 360 unsigned char dp_ssect; /* starting sector */ 361 unsigned char dp_scyl; /* starting cylinder */ 362 unsigned char dp_typ; /* partition type */ 363 unsigned char dp_ehd; /* end head */ 364 unsigned char dp_esect; /* end sector */ 365 unsigned char dp_ecyl; /* end cylinder */ 366 unsigned long dp_start; /* absolute starting sector number */ 367 unsigned long dp_size; /* partition size in sectors */ 368}; 369#endif 370 371#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 372#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 373 374/* 375 * Disk-specific ioctls. 376 */ 377 /* get and set disklabel; DIOCGPART used internally */ 378#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 379#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 380#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 381#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 382 383/* do format operation, read or write */ 384#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 385#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 386 387#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 388#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 389#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 390 391#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 392#define DIOCSBADSCAN _IOW('d', 111, int) /* set badscan mode */ 393 394/* 395 * XXX encoding of disk minor numbers, should be elsewhere. 396 * 397 * See <sys/reboot.h> for a possibly better encoding. 398 * 399 * "cpio -H newc" can be used to back up device files with large minor 400 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 401 * don't have enough bits, and cpio and tar don't notice the lossage. 402 * There are also some sign extension bugs. 403 */ 404 405/* 406 3 2 1 0 407 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 0 408 _________________________________________________________________ 409 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 410 ----------------------------------------------------------------- 411 | TYPE | SLICE | MAJOR? | UNIT |PART | 412 ----------------------------------------------------------------- 413 | TYPE |PART2| SLICE | MAJOR? | UNIT |PART | <-soon 414 ----------------------------------------------------------------- 415 416 I want 3 more part bits (taken from 'TYPE' (useless as it is) (JRE) 417*/ 418#define dkmakeminor(unit, slice, part) \ 419 (((slice) << 16) | ((unit) << 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) >> 21) & 0x7ff) 425#define dkunit(dev) ((minor(dev) >> 3) & 0x1f) 426 427#ifdef KERNEL 428 429struct buf_queue_head; 430 431int bounds_check_with_label __P((struct buf *bp, struct disklabel *lp, 432 int wlabel)); 433void diskerr __P((struct buf *bp, char *dname, char *what, int pri, 434 int blkdone, struct disklabel *lp)); 435void disksort __P((struct buf *ap, struct buf *bp)); 436u_int dkcksum __P((struct disklabel *lp)); 437char *readdisklabel __P((dev_t dev, void (*strat)(struct buf *bp), 438 struct disklabel *lp)); 439void tqdisksort __P((struct buf_queue_head *ap, struct buf *bp)); 440int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 441 u_long openmask)); 442int writedisklabel __P((dev_t dev, void (*strat)(struct buf *bp), 443 struct disklabel *lp)); 444 445#endif /* KERNEL */ 446 447#endif /* LOCORE */ 448 449#ifndef KERNEL 450__BEGIN_DECLS 451struct disklabel *getdiskbyname __P((const char *)); 452__END_DECLS 453#endif 454 455#endif /* !_SYS_DISKLABEL_H_ */ 456