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 * $FreeBSD: src/sys/sys/disklabel.h,v 1.49.2.7 2001/05/27 05:58:26 jkh Exp $ 35 * $DragonFly: src/sys/sys/disklabel32.h,v 1.2 2003/06/17 04:28:58 dillon Exp $ 36 */ 37 38 #ifndef _SYS_DISKLABEL_H_ 39 #define _SYS_DISKLABEL_H_ 40 41 #ifndef _KERNEL 42 #include <sys/types.h> 43 #endif 44 #include <sys/ioccom.h> 45 46 /* 47 * Disk description table, see disktab(5) 48 */ 49 #define _PATH_DISKTAB "/etc/disktab" 50 #define DISKTAB "/etc/disktab" /* deprecated */ 51 52 /* 53 * Each disk has a label which includes information about the hardware 54 * disk geometry, filesystem partitions, and drive specific information. 55 * The label is in block 0 or 1, possibly offset from the beginning 56 * to leave room for a bootstrap, etc. 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 #endif 64 65 #ifdef __alpha__ 66 #define LABELSECTOR 0 67 #define LABELOFFSET 64 68 #endif 69 70 #ifndef LABELSECTOR 71 #define LABELSECTOR 0 /* sector containing label */ 72 #endif 73 74 #ifndef LABELOFFSET 75 #define LABELOFFSET 64 /* offset of label in sector */ 76 #endif 77 78 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 79 #ifndef MAXPARTITIONS 80 #define MAXPARTITIONS 8 81 #endif 82 83 #define LABEL_PART 2 /* partition containing label */ 84 #define RAW_PART 2 /* partition containing whole disk */ 85 #define SWAP_PART 1 /* partition normally containing swap */ 86 87 #ifndef LOCORE 88 struct disklabel { 89 u_int32_t d_magic; /* the magic number */ 90 u_int16_t d_type; /* drive type */ 91 u_int16_t d_subtype; /* controller/d_type specific */ 92 char d_typename[16]; /* type name, e.g. "eagle" */ 93 94 /* 95 * d_packname contains the pack identifier and is returned when 96 * the disklabel is read off the disk or in-core copy. 97 * d_boot0 and d_boot1 are the (optional) names of the 98 * primary (block 0) and secondary (block 1-15) bootstraps 99 * as found in /boot. These are returned when using 100 * getdiskbyname(3) to retrieve the values from /etc/disktab. 101 */ 102 union { 103 char un_d_packname[16]; /* pack identifier */ 104 struct { 105 char *un_d_boot0; /* primary bootstrap name */ 106 char *un_d_boot1; /* secondary bootstrap name */ 107 } un_b; 108 } d_un; 109 #define d_packname d_un.un_d_packname 110 #define d_boot0 d_un.un_b.un_d_boot0 111 #define d_boot1 d_un.un_b.un_d_boot1 112 113 /* disk geometry: */ 114 u_int32_t d_secsize; /* # of bytes per sector */ 115 u_int32_t d_nsectors; /* # of data sectors per track */ 116 u_int32_t d_ntracks; /* # of tracks per cylinder */ 117 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 118 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 119 u_int32_t d_secperunit; /* # of data sectors per unit */ 120 121 /* 122 * Spares (bad sector replacements) below are not counted in 123 * d_nsectors or d_secpercyl. Spare sectors are assumed to 124 * be physical sectors which occupy space at the end of each 125 * track and/or cylinder. 126 */ 127 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 128 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 129 /* 130 * Alternate cylinders include maintenance, replacement, configuration 131 * description areas, etc. 132 */ 133 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 134 135 /* hardware characteristics: */ 136 /* 137 * d_interleave, d_trackskew and d_cylskew describe perturbations 138 * in the media format used to compensate for a slow controller. 139 * Interleave is physical sector interleave, set up by the 140 * formatter or controller when formatting. When interleaving is 141 * in use, logically adjacent sectors are not physically 142 * contiguous, but instead are separated by some number of 143 * sectors. It is specified as the ratio of physical sectors 144 * traversed per logical sector. Thus an interleave of 1:1 145 * implies contiguous layout, while 2:1 implies that logical 146 * sector 0 is separated by one sector from logical sector 1. 147 * d_trackskew is the offset of sector 0 on track N relative to 148 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 149 * is the offset of sector 0 on cylinder N relative to sector 0 150 * on cylinder N-1. 151 */ 152 u_int16_t d_rpm; /* rotational speed */ 153 u_int16_t d_interleave; /* hardware sector interleave */ 154 u_int16_t d_trackskew; /* sector 0 skew, per track */ 155 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 156 u_int32_t d_headswitch; /* head switch time, usec */ 157 u_int32_t d_trkseek; /* track-to-track seek, usec */ 158 u_int32_t d_flags; /* generic flags */ 159 #define NDDATA 5 160 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 161 #define NSPARE 5 162 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 163 u_int32_t d_magic2; /* the magic number (again) */ 164 u_int16_t d_checksum; /* xor of data incl. partitions */ 165 166 /* filesystem and partition information: */ 167 u_int16_t d_npartitions; /* number of partitions in following */ 168 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 169 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 170 struct partition { /* the partition table */ 171 u_int32_t p_size; /* number of sectors in partition */ 172 u_int32_t p_offset; /* starting sector */ 173 u_int32_t p_fsize; /* filesystem basic fragment size */ 174 u_int8_t p_fstype; /* filesystem type, see below */ 175 u_int8_t p_frag; /* filesystem fragments per block */ 176 union { 177 u_int16_t cpg; /* UFS: FS cylinders per group */ 178 u_int16_t sgs; /* LFS: FS segment shift */ 179 } __partition_u1; 180 #define p_cpg __partition_u1.cpg 181 #define p_sgs __partition_u1.sgs 182 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 183 }; 184 185 static u_int16_t dkcksum(struct disklabel *lp); 186 187 static __inline u_int16_t 188 dkcksum(struct disklabel *lp) 189 { 190 u_int16_t *start, *end; 191 u_int16_t sum = 0; 192 193 start = (u_int16_t *)lp; 194 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 195 while (start < end) 196 sum ^= *start++; 197 return (sum); 198 } 199 200 #else /* LOCORE */ 201 /* 202 * offsets for asm boot files. 203 */ 204 .set d_secsize,40 205 .set d_nsectors,44 206 .set d_ntracks,48 207 .set d_ncylinders,52 208 .set d_secpercyl,56 209 .set d_secperunit,60 210 .set d_end_,276 /* size of disk label */ 211 #endif /* LOCORE */ 212 213 /* d_type values: */ 214 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 215 #define DTYPE_MSCP 2 /* MSCP */ 216 #define DTYPE_DEC 3 /* other DEC (rk, rl) */ 217 #define DTYPE_SCSI 4 /* SCSI */ 218 #define DTYPE_ESDI 5 /* ESDI interface */ 219 #define DTYPE_ST506 6 /* ST506 etc. */ 220 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 221 #define DTYPE_HPFL 8 /* HP Fiber-link */ 222 #define DTYPE_FLOPPY 10 /* floppy */ 223 #define DTYPE_CCD 11 /* concatenated disk */ 224 #define DTYPE_VINUM 12 /* vinum volume */ 225 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */ 226 227 #if defined(PC98) && !defined(PC98_ATCOMPAT) 228 #define DSTYPE_SEC256 0x80 /* physical sector size=256 */ 229 #endif 230 231 #ifdef DKTYPENAMES 232 static char *dktypenames[] = { 233 "unknown", 234 "SMD", 235 "MSCP", 236 "old DEC", 237 "SCSI", 238 "ESDI", 239 "ST506", 240 "HP-IB", 241 "HP-FL", 242 "type 9", 243 "floppy", 244 "CCD", 245 "Vinum", 246 "DOC2K", 247 NULL 248 }; 249 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 250 #endif 251 252 /* 253 * Filesystem type and version. 254 * Used to interpret other filesystem-specific 255 * per-partition information. 256 */ 257 #define FS_UNUSED 0 /* unused */ 258 #define FS_SWAP 1 /* swap */ 259 #define FS_V6 2 /* Sixth Edition */ 260 #define FS_V7 3 /* Seventh Edition */ 261 #define FS_SYSV 4 /* System V */ 262 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 263 #define FS_V8 6 /* Eighth Edition, 4K blocks */ 264 #define FS_BSDFFS 7 /* 4.2BSD fast file system */ 265 #define FS_MSDOS 8 /* MSDOS file system */ 266 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 267 #define FS_OTHER 10 /* in use, but unknown/unsupported */ 268 #define FS_HPFS 11 /* OS/2 high-performance file system */ 269 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 270 #define FS_BOOT 13 /* partition contains bootstrap */ 271 #define FS_VINUM 14 /* Vinum drive */ 272 273 #ifdef DKTYPENAMES 274 static char *fstypenames[] = { 275 "unused", 276 "swap", 277 "Version 6", 278 "Version 7", 279 "System V", 280 "4.1BSD", 281 "Eighth Edition", 282 "4.2BSD", 283 "MSDOS", 284 "4.4LFS", 285 "unknown", 286 "HPFS", 287 "ISO9660", 288 "boot", 289 "vinum", 290 NULL 291 }; 292 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 293 #endif 294 295 /* 296 * flags shared by various drives: 297 */ 298 #define D_REMOVABLE 0x01 /* removable media */ 299 #define D_ECC 0x02 /* supports ECC */ 300 #define D_BADSECT 0x04 /* supports bad sector forw. */ 301 #define D_RAMDISK 0x08 /* disk emulator */ 302 #define D_CHAIN 0x10 /* can do back-back transfers */ 303 304 /* 305 * Drive data for SMD. 306 */ 307 #define d_smdflags d_drivedata[0] 308 #define D_SSE 0x1 /* supports skip sectoring */ 309 #define d_mindist d_drivedata[1] 310 #define d_maxdist d_drivedata[2] 311 #define d_sdist d_drivedata[3] 312 313 /* 314 * Drive data for ST506. 315 */ 316 #define d_precompcyl d_drivedata[0] 317 #define d_gap3 d_drivedata[1] /* used only when formatting */ 318 319 /* 320 * Drive data for SCSI. 321 */ 322 #define d_blind d_drivedata[0] 323 324 #ifndef LOCORE 325 /* 326 * Structure used to perform a format or other raw operation, returning 327 * data and/or register values. Register identification and format 328 * are device- and driver-dependent. 329 */ 330 struct format_op { 331 char *df_buf; 332 int df_count; /* value-result */ 333 daddr_t df_startblk; 334 int df_reg[8]; /* result */ 335 }; 336 337 /* 338 * Structure used internally to retrieve information about a partition 339 * on a disk. 340 */ 341 struct partinfo { 342 struct disklabel *disklab; 343 struct partition *part; 344 }; 345 346 /* DOS partition table -- located in boot block */ 347 348 #if defined(PC98) && !defined(PC98_ATCOMPAT) 349 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 350 #define DOSLABELSECTOR 1 /* 0: 256b/s, 1: 512b/s */ 351 #define DOSPARTOFF 0 352 #define NDOSPART 16 353 #define DOSPTYP_386BSD 0x94 /* 386BSD partition type */ 354 #define MBR_PTYPE_FreeBSD 0x94 /* FreeBSD partition type */ 355 356 struct dos_partition { 357 unsigned char dp_mid; 358 #define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */ 359 unsigned char dp_sid; 360 #define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */ 361 unsigned char dp_dum1; 362 unsigned char dp_dum2; 363 unsigned char dp_ipl_sct; 364 unsigned char dp_ipl_head; 365 unsigned short dp_ipl_cyl; 366 unsigned char dp_ssect; /* starting sector */ 367 unsigned char dp_shd; /* starting head */ 368 unsigned short dp_scyl; /* starting cylinder */ 369 unsigned char dp_esect; /* end sector */ 370 unsigned char dp_ehd; /* end head */ 371 unsigned short dp_ecyl; /* end cylinder */ 372 unsigned char dp_name[16]; 373 }; 374 375 #else /* IBMPC */ 376 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 377 #define DOSPARTOFF 446 378 #define NDOSPART 4 379 #define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 380 #define DOSPTYP_LINSWP 0x82 /* Linux swap partition */ 381 #define DOSPTYP_LINUX 0x83 /* Linux partition */ 382 #define DOSPTYP_EXT 5 /* DOS extended partition */ 383 384 struct dos_partition { 385 unsigned char dp_flag; /* bootstrap flags */ 386 unsigned char dp_shd; /* starting head */ 387 unsigned char dp_ssect; /* starting sector */ 388 unsigned char dp_scyl; /* starting cylinder */ 389 unsigned char dp_typ; /* partition type */ 390 unsigned char dp_ehd; /* end head */ 391 unsigned char dp_esect; /* end sector */ 392 unsigned char dp_ecyl; /* end cylinder */ 393 u_int32_t dp_start; /* absolute starting sector number */ 394 u_int32_t dp_size; /* partition size in sectors */ 395 }; 396 #endif 397 398 #define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 399 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 400 401 /* 402 * Disk-specific ioctls. 403 */ 404 /* get and set disklabel; DIOCGPART used internally */ 405 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 406 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 407 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 408 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 409 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */ 410 411 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 412 413 #ifdef _KERNEL 414 415 /* 416 * XXX encoding of disk minor numbers, should be elsewhere. 417 * 418 * See <sys/reboot.h> for a possibly better encoding. 419 * 420 * "cpio -H newc" can be used to back up device files with large minor 421 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 422 * don't have enough bits, and cpio and tar don't notice the lossage. 423 * There are also some sign extension bugs. 424 */ 425 426 /* 427 3 2 1 0 428 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 0 429 _________________________________________________________________ 430 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 431 ----------------------------------------------------------------- 432 | TYPE |UNIT_2 | SLICE | MAJOR? | UNIT |PART | 433 ----------------------------------------------------------------- 434 */ 435 436 #define DKMAXUNIT 0x1ff /* Highest disk unit number */ 437 438 #define dkmakeminor(unit, slice, part) \ 439 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \ 440 (((unit) & 0x1f) << 3) | (part)) 441 static __inline dev_t 442 dkmodpart(dev_t dev, int part) 443 { 444 return (makedev(major(dev), (minor(dev) & ~7) | part)); 445 } 446 447 static __inline dev_t 448 dkmodslice(dev_t dev, int slice) 449 { 450 return (makedev(major(dev), (minor(dev) & ~0x1f0000) | (slice << 16))); 451 } 452 453 #define dkpart(dev) (minor(dev) & 7) 454 #define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 455 #define dktype(dev) ((minor(dev) >> 25) & 0x7f) 456 457 static __inline u_int 458 dkunit(dev_t dev) 459 { 460 return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f)); 461 } 462 463 struct buf; 464 struct buf_queue_head; 465 466 int bounds_check_with_label __P((struct buf *bp, struct disklabel *lp, 467 int wlabel)); 468 void diskerr __P((struct buf *bp, char *what, int pri, int blkdone, 469 struct disklabel *lp)); 470 void disksort __P((struct buf *ap, struct buf *bp)); 471 char *readdisklabel __P((dev_t dev, struct disklabel *lp)); 472 void bufqdisksort __P((struct buf_queue_head *ap, struct buf *bp)); 473 int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, 474 u_long openmask)); 475 int writedisklabel __P((dev_t dev, struct disklabel *lp)); 476 #ifdef __alpha__ 477 void alpha_fix_srm_checksum __P((struct buf *bp)); 478 #endif 479 480 #endif /* _KERNEL */ 481 482 #endif /* LOCORE */ 483 484 #ifndef _KERNEL 485 __BEGIN_DECLS 486 struct disklabel *getdiskbyname __P((const char *)); 487 __END_DECLS 488 #endif 489 490 #endif /* !_SYS_DISKLABEL_H_ */ 491