disklabel.h revision 105056
1193323Sed/* 2193323Sed * Copyright (c) 1987, 1988, 1993 3193323Sed * The Regents of the University of California. All rights reserved. 4193323Sed * 5193323Sed * Redistribution and use in source and binary forms, with or without 6193323Sed * modification, are permitted provided that the following conditions 7193323Sed * are met: 8193323Sed * 1. Redistributions of source code must retain the above copyright 9193323Sed * notice, this list of conditions and the following disclaimer. 10193323Sed * 2. Redistributions in binary form must reproduce the above copyright 11193323Sed * notice, this list of conditions and the following disclaimer in the 12193323Sed * documentation and/or other materials provided with the distribution. 13193323Sed * 3. All advertising materials mentioning features or use of this software 14193323Sed * must display the following acknowledgement: 15193323Sed * This product includes software developed by the University of 16193323Sed * California, Berkeley and its contributors. 17249423Sdim * 4. Neither the name of the University nor the names of its contributors 18249423Sdim * may be used to endorse or promote products derived from this software 19193323Sed * without specific prior written permission. 20249423Sdim * 21193323Sed * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22243830Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23193323Sed * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24193323Sed * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25193323Sed * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26193323Sed * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27193323Sed * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28193323Sed * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29193323Sed * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30193323Sed * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31193323Sed * SUCH DAMAGE. 32193323Sed * 33193323Sed * @(#)disklabel.h 8.2 (Berkeley) 7/10/94 34193323Sed * $FreeBSD: head/sys/sys/disklabel.h 105056 2002-10-13 17:28:14Z phk $ 35193323Sed */ 36193323Sed 37193323Sed#ifndef _SYS_DISKLABEL_H_ 38193323Sed#define _SYS_DISKLABEL_H_ 39193323Sed 40193323Sed#ifndef _KERNEL 41193323Sed#include <sys/types.h> 42193323Sed#endif 43249423Sdim#include <sys/ioccom.h> 44249423Sdim 45249423Sdim/* 46193323Sed * Disk description table, see disktab(5) 47249423Sdim */ 48249423Sdim#define _PATH_DISKTAB "/etc/disktab" 49193323Sed 50249423Sdim/* 51249423Sdim * Each disk has a label which includes information about the hardware 52249423Sdim * disk geometry, filesystem partitions, and drive specific information. 53193323Sed * The label is in block 0 or 1, possibly offset from the beginning 54249423Sdim * to leave room for a bootstrap, etc. 55249423Sdim */ 56249423Sdim 57193323Sed/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 58249423Sdim#ifdef __i386__ 59249423Sdim#define LABELSECTOR 1 /* sector containing label */ 60249423Sdim#define LABELOFFSET 0 /* offset of label in sector */ 61193323Sed#endif 62193323Sed 63193323Sed#ifdef __alpha__ 64193323Sed#define LABELSECTOR 0 65193323Sed#define LABELOFFSET 64 66193323Sed#endif 67193323Sed 68193323Sed#ifdef __ia64__ 69193323Sed#define LABELSECTOR 1 70234353Sdim#define LABELOFFSET 0 71234353Sdim#endif 72234353Sdim 73234353Sdim#ifdef __sparc64__ 74193323Sed#define LABELSECTOR 0 75193323Sed#define LABELOFFSET 128 76249423Sdim#endif 77193323Sed 78193323Sed#ifndef LABELSECTOR 79193323Sed#define LABELSECTOR 0 80193323Sed#endif 81193323Sed 82198090Srdivacky#ifndef LABELOFFSET 83198090Srdivacky#define LABELOFFSET 64 84198090Srdivacky#endif 85198090Srdivacky 86198090Srdivacky#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 87193323Sed#ifndef MAXPARTITIONS 88193323Sed#define MAXPARTITIONS 8 89198090Srdivacky#endif 90198090Srdivacky 91193323Sed/* Size of bootblock area in sector-size neutral bytes */ 92193323Sed#define BBSIZE 8192 93193323Sed 94193323Sed#define LABEL_PART 2 /* partition containing label */ 95193323Sed#define RAW_PART 2 /* partition containing whole disk */ 96249423Sdim#define SWAP_PART 1 /* partition normally containing swap */ 97249423Sdim 98249423Sdimstruct disklabel { 99249423Sdim u_int32_t d_magic; /* the magic number */ 100249423Sdim u_int16_t d_type; /* drive type */ 101249423Sdim u_int16_t d_subtype; /* controller/d_type specific */ 102249423Sdim char d_typename[16]; /* type name, e.g. "eagle" */ 103249423Sdim 104249423Sdim char d_packname[16]; /* pack identifier */ 105193323Sed 106249423Sdim /* disk geometry: */ 107249423Sdim u_int32_t d_secsize; /* # of bytes per sector */ 108249423Sdim u_int32_t d_nsectors; /* # of data sectors per track */ 109249423Sdim u_int32_t d_ntracks; /* # of tracks per cylinder */ 110249423Sdim u_int32_t d_ncylinders; /* # of data cylinders per unit */ 111193323Sed u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 112249423Sdim u_int32_t d_secperunit; /* # of data sectors per unit */ 113249423Sdim 114249423Sdim /* 115249423Sdim * Spares (bad sector replacements) below are not counted in 116193323Sed * d_nsectors or d_secpercyl. Spare sectors are assumed to 117193323Sed * be physical sectors which occupy space at the end of each 118193323Sed * track and/or cylinder. 119210299Sed */ 120210299Sed u_int16_t d_sparespertrack; /* # of spare sectors per track */ 121221345Sdim u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 122210299Sed /* 123193323Sed * Alternate cylinders include maintenance, replacement, configuration 124198090Srdivacky * description areas, etc. 125198090Srdivacky */ 126193323Sed u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 127249423Sdim 128249423Sdim /* hardware characteristics: */ 129249423Sdim /* 130249423Sdim * d_interleave, d_trackskew and d_cylskew describe perturbations 131193323Sed * in the media format used to compensate for a slow controller. 132249423Sdim * Interleave is physical sector interleave, set up by the 133249423Sdim * formatter or controller when formatting. When interleaving is 134263508Sdim * in use, logically adjacent sectors are not physically 135249423Sdim * contiguous, but instead are separated by some number of 136249423Sdim * sectors. It is specified as the ratio of physical sectors 137249423Sdim * traversed per logical sector. Thus an interleave of 1:1 138249423Sdim * implies contiguous layout, while 2:1 implies that logical 139249423Sdim * sector 0 is separated by one sector from logical sector 1. 140249423Sdim * d_trackskew is the offset of sector 0 on track N relative to 141249423Sdim * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 142249423Sdim * is the offset of sector 0 on cylinder N relative to sector 0 143249423Sdim * on cylinder N-1. 144263508Sdim */ 145249423Sdim u_int16_t d_rpm; /* rotational speed */ 146249423Sdim u_int16_t d_interleave; /* hardware sector interleave */ 147249423Sdim u_int16_t d_trackskew; /* sector 0 skew, per track */ 148249423Sdim u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 149249423Sdim u_int32_t d_headswitch; /* head switch time, usec */ 150193323Sed u_int32_t d_trkseek; /* track-to-track seek, usec */ 151193323Sed u_int32_t d_flags; /* generic flags */ 152193323Sed#define NDDATA 5 153193323Sed u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 154193323Sed#define NSPARE 5 155193323Sed u_int32_t d_spare[NSPARE]; /* reserved for future use */ 156193323Sed u_int32_t d_magic2; /* the magic number (again) */ 157193323Sed u_int16_t d_checksum; /* xor of data incl. partitions */ 158193323Sed 159193323Sed /* filesystem and partition information: */ 160198090Srdivacky u_int16_t d_npartitions; /* number of partitions in following */ 161198090Srdivacky u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 162198090Srdivacky u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 163193323Sed struct partition { /* the partition table */ 164198090Srdivacky u_int32_t p_size; /* number of sectors in partition */ 165243830Sdim u_int32_t p_offset; /* starting sector */ 166193323Sed u_int32_t p_fsize; /* filesystem basic fragment size */ 167249423Sdim u_int8_t p_fstype; /* filesystem type, see below */ 168249423Sdim u_int8_t p_frag; /* filesystem fragments per block */ 169249423Sdim u_int16_t p_cpg; /* filesystem cylinders per group */ 170198090Srdivacky } d_partitions[MAXPARTITIONS]; /* actually may be more */ 171249423Sdim}; 172249423Sdim 173234353Sdim#ifdef CTASSERT 174198090SrdivackyCTASSERT(sizeof(struct disklabel) == 148 + MAXPARTITIONS * 16); 175198090Srdivacky#endif 176198090Srdivacky 177198090Srdivackystatic __inline u_int16_t dkcksum(struct disklabel *lp); 178198090Srdivackystatic __inline u_int16_t 179198090Srdivackydkcksum(struct disklabel *lp) 180198090Srdivacky{ 181234353Sdim u_int16_t *start, *end; 182198090Srdivacky u_int16_t sum = 0; 183198090Srdivacky 184198090Srdivacky start = (u_int16_t *)lp; 185198090Srdivacky end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 186198090Srdivacky while (start < end) 187249423Sdim sum ^= *start++; 188249423Sdim return (sum); 189249423Sdim} 190249423Sdim 191198090Srdivacky 192198090Srdivacky/* d_type values: */ 193198090Srdivacky#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 194210299Sed#define DTYPE_MSCP 2 /* MSCP */ 195210299Sed#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 196210299Sed#define DTYPE_SCSI 4 /* SCSI */ 197210299Sed#define DTYPE_ESDI 5 /* ESDI interface */ 198210299Sed#define DTYPE_ST506 6 /* ST506 etc. */ 199210299Sed#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 200198090Srdivacky#define DTYPE_HPFL 8 /* HP Fiber-link */ 201198090Srdivacky#define DTYPE_FLOPPY 10 /* floppy */ 202198090Srdivacky#define DTYPE_CCD 11 /* concatenated disk */ 203198090Srdivacky#define DTYPE_VINUM 12 /* vinum volume */ 204193323Sed#define DTYPE_DOC2K 13 /* Msys DiskOnChip */ 205198090Srdivacky#define DTYPE_JFS2 16 /* IBM JFS 2 */ 206193323Sed 207193323Sed#ifdef DKTYPENAMES 208193323Sedstatic const char *dktypenames[] = { 209 "unknown", 210 "SMD", 211 "MSCP", 212 "old DEC", 213 "SCSI", 214 "ESDI", 215 "ST506", 216 "HP-IB", 217 "HP-FL", 218 "type 9", 219 "floppy", 220 "CCD", 221 "Vinum", 222 "DOC2K", 223 "?", 224 "?", 225 "jfs", 226 NULL 227}; 228#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 229#endif 230 231/* 232 * Filesystem type and version. 233 * Used to interpret other filesystem-specific 234 * per-partition information. 235 */ 236#define FS_UNUSED 0 /* unused */ 237#define FS_SWAP 1 /* swap */ 238#define FS_V6 2 /* Sixth Edition */ 239#define FS_V7 3 /* Seventh Edition */ 240#define FS_SYSV 4 /* System V */ 241#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 242#define FS_V8 6 /* Eighth Edition, 4K blocks */ 243#define FS_BSDFFS 7 /* 4.2BSD fast filesystem */ 244#define FS_MSDOS 8 /* MSDOS filesystem */ 245#define FS_BSDLFS 9 /* 4.4BSD log-structured filesystem */ 246#define FS_OTHER 10 /* in use, but unknown/unsupported */ 247#define FS_HPFS 11 /* OS/2 high-performance filesystem */ 248#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 249#define FS_BOOT 13 /* partition contains bootstrap */ 250#define FS_VINUM 14 /* Vinum drive */ 251#define FS_JFS2 21 /* IBM JFS2 */ 252 253#ifdef FSTYPENAMES 254static const 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 "vinum", 270 "?", 271 "?", 272 "?", 273 "?", 274 "?", 275 "?", 276 "jfs", 277 NULL 278}; 279#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 280#endif 281 282/* 283 * flags shared by various drives: 284 */ 285#define D_REMOVABLE 0x01 /* removable media */ 286#define D_ECC 0x02 /* supports ECC */ 287#define D_BADSECT 0x04 /* supports bad sector forw. */ 288#define D_RAMDISK 0x08 /* disk emulator */ 289#define D_CHAIN 0x10 /* can do back-back transfers */ 290 291/* 292 * Disklabel-specific ioctls. 293 * 294 * NB: <sys/disk.h> defines ioctls from 'd'/128 and up. 295 */ 296 /* get and set disklabel */ 297#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 298#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 299#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 300 301#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 302 303#ifdef _KERNEL 304 305/* 306 * XXX encoding of disk minor numbers, should be elsewhere. 307 * 308 * See <sys/reboot.h> for a possibly better encoding. 309 * 310 * "cpio -H newc" can be used to back up device files with large minor 311 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats 312 * don't have enough bits, and cpio and tar don't notice the lossage. 313 * There are also some sign extension bugs. 314 */ 315 316/* 317 3 2 1 0 318 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 0 319 _________________________________________________________________ 320 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 321 ----------------------------------------------------------------- 322 | SPARE |UNIT_2 | SLICE | MAJOR? | UNIT |PART | 323 ----------------------------------------------------------------- 324*/ 325 326#define DKMAXUNIT 0x1ff 327 328#define dkmakeminor(unit, slice, part) \ 329 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \ 330 (((unit) & 0x1f) << 3) | (part)) 331#define dkpart(dev) (minor(dev) & 7) 332#define dkslice(dev) ((minor(dev) >> 16) & 0x1f) 333#define dksparebits(dev) ((minor(dev) >> 25) & 0x7f) 334 335struct bio; 336struct bio_queue_head; 337 338int bounds_check_with_label(struct bio *bp, struct disklabel *lp, 339 int wlabel); 340dev_t dkmodpart(dev_t dev, int part); 341dev_t dkmodslice(dev_t dev, int slice); 342u_int dkunit(dev_t dev); 343char *readdisklabel(dev_t dev, struct disklabel *lp); 344int setdisklabel(struct disklabel *olp, struct disklabel *nlp, 345 u_long openmask); 346int writedisklabel(dev_t dev, struct disklabel *lp); 347#ifdef __alpha__ 348struct buf; 349void alpha_fix_srm_checksum(struct buf *bp); 350#endif 351 352#endif /* _KERNEL */ 353 354 355#ifndef _KERNEL 356__BEGIN_DECLS 357struct disklabel *getdiskbyname(const char *); 358__END_DECLS 359#endif 360 361#endif /* !_SYS_DISKLABEL_H_ */ 362