disklabel.h revision 4462
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 8.1 (Berkeley) 6/2/93 34 * $Id: disklabel.h,v 1.7 1994/10/31 06:31:14 phk Exp $ 35 */ 36 37#ifndef _SYS_DISKLABEL_H_ 38#define _SYS_DISKLABEL_H_ 39 40/* 41 * Disk description table, see disktab(5) 42 */ 43#define _PATH_DISKTAB "/etc/disktab" 44#define DISKTAB "/etc/disktab" /* deprecated */ 45 46/* 47 * Each disk has a label which includes information about the hardware 48 * disk geometry, filesystem partitions, and drive specific information. 49 * The label is in block 0 or 1, possibly offset from the beginning 50 * to leave room for a bootstrap, etc. 51 */ 52 53/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 54#ifdef __i386__ 55#define LABELSECTOR 1 /* sector containing label */ 56#define LABELOFFSET 0 /* offset of label in sector */ 57#define OURPART 2 /* partition is 'all BSD' */ 58#define RAWPART 3 /* partition is 'all device' */ 59#define readMSPtolabel readMBRtolabel 60#endif 61 62#ifndef readMSPtolabel 63#define readMSPtolabel(a,b,c,d,e,) /* zap calls if irrelevant */ 64#endif 65 66#ifdef tahoe 67#define RAWPART 0 68#endif 69 70#ifndef RAWPART 71#define RAWPART 2 72#endif 73 74#ifndef OURPART 75#define OURPART RAWPART /* by default it's all ours */ 76#endif 77 78#ifndef LABELSECTOR 79#define LABELSECTOR 0 /* sector containing label */ 80#endif 81 82#ifndef LABELOFFSET 83#define LABELOFFSET 64 /* offset of label in sector */ 84#endif 85 86#define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */ 87#ifndef MAXPARTITIONS 88#define MAXPARTITIONS 8 89#endif 90 91 92#ifndef LOCORE 93struct disklabel { 94 u_long d_magic; /* the magic number */ 95 short d_type; /* drive type */ 96 short d_subtype; /* controller/d_type specific */ 97 char d_typename[16]; /* type name, e.g. "eagle" */ 98 /* 99 * d_packname contains the pack identifier and is returned when 100 * the disklabel is read off the disk or in-core copy. 101 * d_boot0 and d_boot1 are the (optional) names of the 102 * primary (block 0) and secondary (block 1-15) bootstraps 103 * as found in /usr/mdec. These are returned when using 104 * getdiskbyname(3) to retrieve the values from /etc/disktab. 105 */ 106#if defined(KERNEL) || defined(STANDALONE) 107 char d_packname[16]; /* pack identifier */ 108#else 109 union { 110 char un_d_packname[16]; /* pack identifier */ 111 struct { 112 char *un_d_boot0; /* primary bootstrap name */ 113 char *un_d_boot1; /* secondary bootstrap name */ 114 } un_b; 115 } d_un; 116#define d_packname d_un.un_d_packname 117#define d_boot0 d_un.un_b.un_d_boot0 118#define d_boot1 d_un.un_b.un_d_boot1 119#endif /* ! KERNEL or STANDALONE */ 120 /* disk geometry: */ 121 u_long d_secsize; /* # of bytes per sector */ 122 u_long d_nsectors; /* # of data sectors per track */ 123 u_long d_ntracks; /* # of tracks per cylinder */ 124 u_long d_ncylinders; /* # of data cylinders per unit */ 125 u_long d_secpercyl; /* # of data sectors per cylinder */ 126 u_long d_secperunit; /* # of data sectors per unit */ 127 /* 128 * Spares (bad sector replacements) below 129 * are not counted in d_nsectors or d_secpercyl. 130 * Spare sectors are assumed to be physical sectors 131 * which occupy space at the end of each track and/or cylinder. 132 */ 133 u_short d_sparespertrack; /* # of spare sectors per track */ 134 u_short d_sparespercyl; /* # of spare sectors per cylinder */ 135 /* 136 * Alternate cylinders include maintenance, replacement, 137 * configuration description areas, etc. 138 */ 139 u_long d_acylinders; /* # of alt. cylinders per unit */ 140 141 /* hardware characteristics: */ 142 /* 143 * d_interleave, d_trackskew and d_cylskew describe perturbations 144 * in the media format used to compensate for a slow controller. 145 * Interleave is physical sector interleave, set up by the formatter 146 * or controller when formatting. When interleaving is in use, 147 * logically adjacent sectors are not physically contiguous, 148 * but instead are separated by some number of sectors. 149 * It is specified as the ratio of physical sectors traversed 150 * per logical sector. Thus an interleave of 1:1 implies contiguous 151 * layout, while 2:1 implies that logical sector 0 is separated 152 * by one sector from logical sector 1. 153 * d_trackskew is the offset of sector 0 on track N 154 * relative to sector 0 on track N-1 on the same cylinder. 155 * Finally, d_cylskew is the offset of sector 0 on cylinder N 156 * relative to sector 0 on cylinder N-1. 157 */ 158 u_short d_rpm; /* rotational speed */ 159 u_short d_interleave; /* hardware sector interleave */ 160 u_short d_trackskew; /* sector 0 skew, per track */ 161 u_short d_cylskew; /* sector 0 skew, per cylinder */ 162 u_long d_headswitch; /* head switch time, usec */ 163 u_long d_trkseek; /* track-to-track seek, usec */ 164 u_long d_flags; /* generic flags */ 165#define NDDATA 5 166 u_long d_drivedata[NDDATA]; /* drive-type specific information */ 167#define NSPARE 5 168 u_long d_spare[NSPARE]; /* reserved for future use */ 169 u_long d_magic2; /* the magic number (again) */ 170 u_short d_checksum; /* xor of data incl. partitions */ 171 172 /* filesystem and partition information: */ 173 u_short d_npartitions; /* number of partitions in following */ 174 u_long d_bbsize; /* size of boot area at sn0, bytes */ 175 u_long d_sbsize; /* max size of fs superblock, bytes */ 176 struct partition { /* the partition table */ 177 u_long p_size; /* number of sectors in partition */ 178 u_long p_offset; /* starting sector */ 179 u_long p_fsize; /* filesystem basic fragment size */ 180 u_char p_fstype; /* filesystem type, see below */ 181 u_char p_frag; /* filesystem fragments per block */ 182 union { 183 u_short cpg; /* UFS: FS cylinders per group */ 184 u_short sgs; /* LFS: FS segment shift */ 185 } __partition_u1; 186#define p_cpg __partition_u1.cpg 187#define p_sgs __partition_u1.sgs 188 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 189}; 190struct cpu_disklabel { 191}; 192#else /* LOCORE */ 193 /* 194 * offsets for asm boot files. 195 */ 196 .set d_secsize,40 197 .set d_nsectors,44 198 .set d_ntracks,48 199 .set d_ncylinders,52 200 .set d_secpercyl,56 201 .set d_secperunit,60 202 .set d_end_,276 /* size of disk label */ 203#endif /* LOCORE */ 204 205/* d_type values: */ 206#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 207#define DTYPE_MSCP 2 /* MSCP */ 208#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 209#define DTYPE_SCSI 4 /* SCSI */ 210#define DTYPE_ESDI 5 /* ESDI interface */ 211#define DTYPE_ST506 6 /* ST506 etc. */ 212#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 213#define DTYPE_HPFL 8 /* HP Fiber-link */ 214#define DTYPE_FLOPPY 10 /* floppy */ 215 216/* d_subtype values: */ 217#define DSTYPE_INDOSPART 0x8 /* is inside dos partition */ 218#define DSTYPE_DOSPART(s) ((s) & 3) /* dos partition number */ 219#define DSTYPE_GEOMETRY 0x10 /* drive params in label */ 220 221#ifdef DKTYPENAMES 222static char *dktypenames[] = { 223 "unknown", 224 "SMD", 225 "MSCP", 226 "old DEC", 227 "SCSI", 228 "ESDI", 229 "ST506", 230 "HP-IB", 231 "HP-FL", 232 "type 9", 233 "floppy", 234 0 235}; 236#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 237#endif 238 239/* 240 * Filesystem type and version. 241 * Used to interpret other filesystem-specific 242 * per-partition information. 243 */ 244#define FS_UNUSED 0 /* unused */ 245#define FS_SWAP 1 /* swap */ 246#define FS_V6 2 /* Sixth Edition */ 247#define FS_V7 3 /* Seventh Edition */ 248#define FS_SYSV 4 /* System V */ 249#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 250#define FS_V8 6 /* Eighth Edition, 4K blocks */ 251#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 252#define FS_MSDOS 8 /* MSDOS file system */ 253#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 254#define FS_OTHER 10 /* in use, but unknown/unsupported */ 255#define FS_HPFS 11 /* OS/2 high-performance file system */ 256#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 257#define FS_BOOT 13 /* partition contains bootstrap */ 258 259#ifdef DKTYPENAMES 260static char *fstypenames[] = { 261 "unused", 262 "swap", 263 "Version 6", 264 "Version 7", 265 "System V", 266 "4.1BSD", 267 "Eighth Edition", 268 "4.2BSD", 269 "MSDOS", 270 "4.4LFS", 271 "unknown", 272 "HPFS", 273 "ISO9660", 274 "boot", 275 0 276}; 277#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 278#endif 279 280/* 281 * flags shared by various drives: 282 */ 283#define D_REMOVABLE 0x01 /* removable media */ 284#define D_ECC 0x02 /* supports ECC */ 285#define D_BADSECT 0x04 /* supports bad sector forw. */ 286#define D_RAMDISK 0x08 /* disk emulator */ 287#define D_CHAIN 0x10 /* can do back-back transfers */ 288 289/* 290 * Drive data for SMD. 291 */ 292#define d_smdflags d_drivedata[0] 293#define D_SSE 0x1 /* supports skip sectoring */ 294#define d_mindist d_drivedata[1] 295#define d_maxdist d_drivedata[2] 296#define d_sdist d_drivedata[3] 297 298/* 299 * Drive data for ST506. 300 */ 301#define d_precompcyl d_drivedata[0] 302#define d_gap3 d_drivedata[1] /* used only when formatting */ 303 304/* 305 * Drive data for SCSI. 306 */ 307#define d_blind d_drivedata[0] 308 309#ifndef LOCORE 310/* 311 * Structure used to perform a format 312 * or other raw operation, returning data 313 * and/or register values. 314 * Register identification and format 315 * are device- and driver-dependent. 316 */ 317struct format_op { 318 char *df_buf; 319 int df_count; /* value-result */ 320 daddr_t df_startblk; 321 int df_reg[8]; /* result */ 322}; 323 324/* 325 * Structure used internally to retrieve 326 * information about a partition on a disk. 327 */ 328struct partinfo { 329 struct disklabel *disklab; 330 struct partition *part; 331}; 332 333/* DOS partition table -- located in boot block */ 334 335#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 336#define DOSPARTOFF 446 337#define NDOSPART 4 338#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 339#define MBR_PTYPE_FreeBSD 0xa5 /* FreeBSD partition type */ 340 341struct dos_partition { 342 unsigned char dp_flag; /* bootstrap flags */ 343 unsigned char dp_shd; /* starting head */ 344 unsigned char dp_ssect; /* starting sector */ 345 unsigned char dp_scyl; /* starting cylinder */ 346 unsigned char dp_typ; /* partition type */ 347 unsigned char dp_ehd; /* end head */ 348 unsigned char dp_esect; /* end sector */ 349 unsigned char dp_ecyl; /* end cylinder */ 350 unsigned long dp_start; /* absolute starting sector number */ 351 unsigned long dp_size; /* partition size in sectors */ 352}; 353 354extern struct dos_partition dos_partitions[NDOSPART]; 355 356#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 357#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 358 359/* 360 * Disk-specific ioctls. 361 */ 362 /* get and set disklabel; DIOCGPART used internally */ 363#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 364#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 365#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 366#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 367 368/* do format operation, read or write */ 369#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 370#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 371 372#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 373#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 374#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 375 376#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 377 378#endif /* LOCORE */ 379 380#ifdef KERNEL 381struct dkbad; 382 383u_int dkcksum __P((struct disklabel *)); 384int writedisklabel __P((dev_t dev, void (*strat)(), struct disklabel *lp)); 385char * readdisklabel __P((dev_t dev, void (*strat)(), struct disklabel *lp, struct dos_partition *dp, struct dkbad *bdp)); 386int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, u_long openmask)); 387void disksort __P((struct buf *ap, struct buf *bp)); 388void diskerr __P((struct buf *, char *, char *, int, int, struct disklabel *)); 389#ifdef __i386 390char * readMBRtolabel __P(( dev_t dev , void (*strat)(), register struct disklabel *lp, struct dos_partition *dp, int *cyl)); 391#endif 392#endif 393 394#if !defined(KERNEL) && !defined(LOCORE) 395 396#include <sys/cdefs.h> 397 398__BEGIN_DECLS 399struct disklabel *getdiskbyname __P((const char *)); 400__END_DECLS 401 402#endif 403 404#ifdef __i386 405/* encoding of disk minor numbers, should be elsewhere... */ 406#define dkunit(dev) (minor(dev) >> 3) 407#define dkpart(dev) (minor(dev) & 07) 408#define dkminor(unit, part) (((unit) << 3) | (part)) 409#endif 410 411#endif 412 413 414