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/disklabel.h,v 1.12 2006/02/17 19:18:07 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 #include <sys/conf.h> 46 47 /* 48 * Disk description table, see disktab(5) 49 */ 50 #define _PATH_DISKTAB "/etc/disktab" 51 #define DISKTAB "/etc/disktab" /* deprecated */ 52 53 /* 54 * Each disk has a label which includes information about the hardware 55 * disk geometry, filesystem partitions, and drive specific information. 56 * The label is in block 0 or 1, possibly offset from the beginning 57 * to leave room for a bootstrap, etc. 58 */ 59 60 /* XXX these should be defined per controller (or drive) elsewhere, not here! */ 61 #ifdef __i386__ 62 #define LABELSECTOR 1 /* sector containing label */ 63 #define LABELOFFSET 0 /* offset of label in sector */ 64 #endif 65 66 #ifndef LABELSECTOR 67 #define LABELSECTOR 0 /* sector containing label */ 68 #endif 69 70 #ifndef LABELOFFSET 71 #define LABELOFFSET 64 /* offset of label in sector */ 72 #endif 73 74 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 75 #ifndef MAXPARTITIONS 76 #define MAXPARTITIONS 16 77 #endif 78 79 #define LABEL_PART 2 /* partition containing label */ 80 #define RAW_PART 2 /* partition containing whole disk */ 81 #define SWAP_PART 1 /* partition normally containing swap */ 82 83 #ifndef LOCORE 84 struct disklabel { 85 u_int32_t d_magic; /* the magic number */ 86 u_int16_t d_type; /* drive type */ 87 u_int16_t d_subtype; /* controller/d_type specific */ 88 char d_typename[16]; /* type name, e.g. "eagle" */ 89 90 /* 91 * d_packname contains the pack identifier and is returned when 92 * the disklabel is read off the disk or in-core copy. 93 * d_boot0 and d_boot1 are the (optional) names of the 94 * primary (block 0) and secondary (block 1-15) bootstraps 95 * as found in /boot. These are returned when using 96 * getdiskbyname(3) to retrieve the values from /etc/disktab. 97 */ 98 union { 99 char un_d_packname[16]; /* pack identifier */ 100 struct { 101 char *un_d_boot0; /* primary bootstrap name */ 102 char *un_d_boot1; /* secondary bootstrap name */ 103 } un_b; 104 } d_un; 105 #define d_packname d_un.un_d_packname 106 #define d_boot0 d_un.un_b.un_d_boot0 107 #define d_boot1 d_un.un_b.un_d_boot1 108 109 /* disk geometry: */ 110 u_int32_t d_secsize; /* # of bytes per sector */ 111 u_int32_t d_nsectors; /* # of data sectors per track */ 112 u_int32_t d_ntracks; /* # of tracks per cylinder */ 113 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 114 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 115 u_int32_t d_secperunit; /* # of data sectors per unit */ 116 117 /* 118 * Spares (bad sector replacements) below are not counted in 119 * d_nsectors or d_secpercyl. Spare sectors are assumed to 120 * be physical sectors which occupy space at the end of each 121 * track and/or cylinder. 122 */ 123 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 124 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 125 /* 126 * Alternate cylinders include maintenance, replacement, configuration 127 * description areas, etc. 128 */ 129 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 130 131 /* hardware characteristics: */ 132 /* 133 * d_interleave, d_trackskew and d_cylskew describe perturbations 134 * in the media format used to compensate for a slow controller. 135 * Interleave is physical sector interleave, set up by the 136 * formatter or controller when formatting. When interleaving is 137 * in use, logically adjacent sectors are not physically 138 * contiguous, but instead are separated by some number of 139 * sectors. It is specified as the ratio of physical sectors 140 * traversed per logical sector. Thus an interleave of 1:1 141 * implies contiguous layout, while 2:1 implies that logical 142 * sector 0 is separated by one sector from logical sector 1. 143 * d_trackskew is the offset of sector 0 on track N relative to 144 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 145 * is the offset of sector 0 on cylinder N relative to sector 0 146 * on cylinder N-1. 147 */ 148 u_int16_t d_rpm; /* rotational speed */ 149 u_int16_t d_interleave; /* hardware sector interleave */ 150 u_int16_t d_trackskew; /* sector 0 skew, per track */ 151 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 152 u_int32_t d_headswitch; /* head switch time, usec */ 153 u_int32_t d_trkseek; /* track-to-track seek, usec */ 154 u_int32_t d_flags; /* generic flags */ 155 #define NDDATA 5 156 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 157 #define NSPARE 5 158 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 159 u_int32_t d_magic2; /* the magic number (again) */ 160 u_int16_t d_checksum; /* xor of data incl. partitions */ 161 162 /* filesystem and partition information: */ 163 u_int16_t d_npartitions; /* number of partitions in following */ 164 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 165 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 166 struct partition { /* the partition table */ 167 u_int32_t p_size; /* number of sectors in partition */ 168 u_int32_t p_offset; /* starting sector */ 169 u_int32_t p_fsize; /* filesystem basic fragment size */ 170 u_int8_t p_fstype; /* filesystem type, see below */ 171 u_int8_t p_frag; /* filesystem fragments per block */ 172 union { 173 u_int16_t cpg; /* UFS: FS cylinders per group */ 174 u_int16_t sgs; /* LFS: FS segment shift */ 175 } __partition_u1; 176 #define p_cpg __partition_u1.cpg 177 #define p_sgs __partition_u1.sgs 178 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 179 }; 180 181 static u_int16_t dkcksum(struct disklabel *lp); 182 183 static __inline u_int16_t 184 dkcksum(struct disklabel *lp) 185 { 186 u_int16_t *start, *end; 187 u_int16_t sum = 0; 188 189 start = (u_int16_t *)lp; 190 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 191 while (start < end) 192 sum ^= *start++; 193 return (sum); 194 } 195 196 #else /* LOCORE */ 197 /* 198 * offsets for asm boot files. 199 */ 200 .set d_secsize,40 201 .set d_nsectors,44 202 .set d_ntracks,48 203 .set d_ncylinders,52 204 .set d_secpercyl,56 205 .set d_secperunit,60 206 .set d_end_,276 /* size of disk label */ 207 #endif /* LOCORE */ 208 209 /* d_type values: */ 210 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 211 #define DTYPE_MSCP 2 /* MSCP */ 212 #define DTYPE_DEC 3 /* other DEC (rk, rl) */ 213 #define DTYPE_SCSI 4 /* SCSI */ 214 #define DTYPE_ESDI 5 /* ESDI interface */ 215 #define DTYPE_ST506 6 /* ST506 etc. */ 216 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 217 #define DTYPE_HPFL 8 /* HP Fiber-link */ 218 #define DTYPE_FLOPPY 10 /* floppy */ 219 #define DTYPE_CCD 11 /* concatenated disk */ 220 #define DTYPE_VINUM 12 /* vinum volume */ 221 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */ 222 223 #ifdef DKTYPENAMES 224 static const char *dktypenames[] = { 225 "unknown", 226 "SMD", 227 "MSCP", 228 "old DEC", 229 "SCSI", 230 "ESDI", 231 "ST506", 232 "HP-IB", 233 "HP-FL", 234 "type 9", 235 "floppy", 236 "CCD", 237 "Vinum", 238 "DOC2K", 239 NULL 240 }; 241 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 242 #endif 243 244 /* 245 * Filesystem type and version. 246 * Used to interpret other filesystem-specific 247 * per-partition information. 248 */ 249 #define FS_UNUSED 0 /* unused */ 250 #define FS_SWAP 1 /* swap */ 251 #define FS_V6 2 /* Sixth Edition */ 252 #define FS_V7 3 /* Seventh Edition */ 253 #define FS_SYSV 4 /* System V */ 254 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 255 #define FS_V8 6 /* Eighth Edition, 4K blocks */ 256 #define FS_BSDFFS 7 /* 4.2BSD fast file system */ 257 #define FS_MSDOS 8 /* MSDOS file system */ 258 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 259 #define FS_OTHER 10 /* in use, but unknown/unsupported */ 260 #define FS_HPFS 11 /* OS/2 high-performance file system */ 261 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 262 #define FS_BOOT 13 /* partition contains bootstrap */ 263 #define FS_VINUM 14 /* Vinum drive */ 264 265 #ifdef DKTYPENAMES 266 static const char *fstypenames[] = { 267 "unused", 268 "swap", 269 "Version 6", 270 "Version 7", 271 "System V", 272 "4.1BSD", 273 "Eighth Edition", 274 "4.2BSD", 275 "MSDOS", 276 "4.4LFS", 277 "unknown", 278 "HPFS", 279 "ISO9660", 280 "boot", 281 "vinum", 282 NULL 283 }; 284 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 285 #endif 286 287 /* 288 * flags shared by various drives: 289 */ 290 #define D_REMOVABLE 0x01 /* removable media */ 291 #define D_ECC 0x02 /* supports ECC */ 292 #define D_BADSECT 0x04 /* supports bad sector forw. */ 293 #define D_RAMDISK 0x08 /* disk emulator */ 294 #define D_CHAIN 0x10 /* can do back-back transfers */ 295 296 /* 297 * Drive data for SMD. 298 */ 299 #define d_smdflags d_drivedata[0] 300 #define D_SSE 0x1 /* supports skip sectoring */ 301 #define d_mindist d_drivedata[1] 302 #define d_maxdist d_drivedata[2] 303 #define d_sdist d_drivedata[3] 304 305 /* 306 * Drive data for ST506. 307 */ 308 #define d_precompcyl d_drivedata[0] 309 #define d_gap3 d_drivedata[1] /* used only when formatting */ 310 311 /* 312 * Drive data for SCSI. 313 */ 314 #define d_blind d_drivedata[0] 315 316 #ifndef LOCORE 317 /* 318 * Structure used to perform a format or other raw operation, returning 319 * data and/or register values. Register identification and format 320 * are device- and driver-dependent. 321 */ 322 struct format_op { 323 char *df_buf; 324 int df_count; /* value-result */ 325 daddr_t df_startblk; 326 int df_reg[8]; /* result */ 327 }; 328 329 /* 330 * Structure used internally to retrieve information about a partition 331 * on a disk. 332 */ 333 struct partinfo { 334 struct disklabel *disklab; 335 struct partition *part; 336 }; 337 338 /* 339 * Disk-specific ioctls. 340 */ 341 /* get and set disklabel; DIOCGPART used internally */ 342 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 343 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 344 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 345 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 346 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */ 347 348 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 349 350 #ifdef _KERNEL 351 352 /* 353 * XXX encoding of disk minor numbers, should be elsewhere. 354 * 355 * See <sys/reboot.h> for a possibly better encoding. 356 * 357 * "cpio -H newc" can be used to back up device files with large minor 358 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 359 * don't have enough bits, and cpio and tar don't notice the lossage. 360 * There are also some sign extension bugs. 361 */ 362 363 /* 364 3 2 1 0 365 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 0 366 _________________________________________________________________ 367 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 368 ----------------------------------------------------------------- 369 | TYPE |UNIT_2 |P| SLICE | MAJOR? | UNIT |PART | 370 ----------------------------------------------------------------- 371 */ 372 373 #define DKMAXUNIT 0x1ff /* Highest disk unit number */ 374 375 #define dkmakeminor(unit, slice, part) \ 376 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \ 377 (((unit) & 0x1f) << 3) | (part & 7) | \ 378 ((part & 0x08) << 17)) 379 380 static __inline u_int 381 dkunitmask(void) 382 { 383 return (0x01e000f8); 384 } 385 386 static __inline u_int 387 dkmakeunit(int unit) 388 { 389 return(dkmakeminor(unit, 0, 0)); 390 } 391 392 static __inline dev_t 393 dkmodpart(dev_t dev, int part) 394 { 395 int val; 396 397 if (part < 8) 398 val = (part & 7); 399 else 400 val = (part & 7) | 0x100000; 401 return (make_sub_dev(dev, (minor(dev) & ~0x100007) | val)); 402 } 403 404 static __inline dev_t 405 dkmodslice(dev_t dev, int slice) 406 { 407 return (make_sub_dev(dev, (minor(dev) & ~0x0f0000) | (slice << 16))); 408 } 409 410 static __inline int 411 dkpart(dev_t dev) 412 { 413 return (((minor(dev) >> 17) & 0x08) | (minor(dev) & 7)); 414 } 415 416 #define dkslice(dev) ((minor(dev) >> 16) & 0x0f) 417 #define dktype(dev) ((minor(dev) >> 25) & 0x7f) 418 419 static __inline u_int 420 dkunit(dev_t dev) 421 { 422 return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f)); 423 } 424 425 struct buf; 426 struct bio; 427 struct bio_queue_head; 428 429 struct bio *bounds_check_with_label (dev_t dev, struct bio *bio, 430 struct disklabel *lp, int wlabel); 431 void diskerr (struct bio *bio, dev_t dev, const char *what, int pri, 432 int blkdone, struct disklabel *lp); 433 void disksort (struct buf *ap, struct buf *bp); 434 char *readdisklabel (dev_t dev, struct disklabel *lp); 435 void bioqdisksort (struct bio_queue_head *ap, struct bio *bio); 436 int setdisklabel (struct disklabel *olp, struct disklabel *nlp, 437 u_long openmask); 438 int writedisklabel (dev_t dev, struct disklabel *lp); 439 440 #endif /* _KERNEL */ 441 442 #endif /* LOCORE */ 443 444 #ifndef _KERNEL 445 __BEGIN_DECLS 446 struct disklabel *getdiskbyname (const char *); 447 __END_DECLS 448 #endif 449 450 #endif /* !_SYS_DISKLABEL_H_ */ 451