disklabel.h revision 3742
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 1.4 1994/08/21 04:41:39 paul 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#endif 58 59#ifndef LABELSECTOR 60#define LABELSECTOR 0 /* sector containing label */ 61#endif 62 63#ifndef LABELOFFSET 64#define LABELOFFSET 64 /* offset of label in sector */ 65#endif 66 67#define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */ 68#ifndef MAXPARTITIONS 69#define MAXPARTITIONS 8 70#endif 71 72 73#ifndef LOCORE 74struct disklabel { 75 u_long d_magic; /* the magic number */ 76 short d_type; /* drive type */ 77 short d_subtype; /* controller/d_type specific */ 78 char d_typename[16]; /* type name, e.g. "eagle" */ 79 /* 80 * d_packname contains the pack identifier and is returned when 81 * the disklabel is read off the disk or in-core copy. 82 * d_boot0 and d_boot1 are the (optional) names of the 83 * primary (block 0) and secondary (block 1-15) bootstraps 84 * as found in /usr/mdec. These are returned when using 85 * getdiskbyname(3) to retrieve the values from /etc/disktab. 86 */ 87#if defined(KERNEL) || defined(STANDALONE) 88 char d_packname[16]; /* pack identifier */ 89#else 90 union { 91 char un_d_packname[16]; /* pack identifier */ 92 struct { 93 char *un_d_boot0; /* primary bootstrap name */ 94 char *un_d_boot1; /* secondary bootstrap name */ 95 } un_b; 96 } d_un; 97#define d_packname d_un.un_d_packname 98#define d_boot0 d_un.un_b.un_d_boot0 99#define d_boot1 d_un.un_b.un_d_boot1 100#endif /* ! KERNEL or STANDALONE */ 101 /* disk geometry: */ 102 u_long d_secsize; /* # of bytes per sector */ 103 u_long d_nsectors; /* # of data sectors per track */ 104 u_long d_ntracks; /* # of tracks per cylinder */ 105 u_long d_ncylinders; /* # of data cylinders per unit */ 106 u_long d_secpercyl; /* # of data sectors per cylinder */ 107 u_long d_secperunit; /* # of data sectors per unit */ 108 /* 109 * Spares (bad sector replacements) below 110 * are not counted in d_nsectors or d_secpercyl. 111 * Spare sectors are assumed to be physical sectors 112 * which occupy space at the end of each track and/or cylinder. 113 */ 114 u_short d_sparespertrack; /* # of spare sectors per track */ 115 u_short d_sparespercyl; /* # of spare sectors per cylinder */ 116 /* 117 * Alternate cylinders include maintenance, replacement, 118 * configuration description areas, etc. 119 */ 120 u_long d_acylinders; /* # of alt. cylinders per unit */ 121 122 /* hardware characteristics: */ 123 /* 124 * d_interleave, d_trackskew and d_cylskew describe perturbations 125 * in the media format used to compensate for a slow controller. 126 * Interleave is physical sector interleave, set up by the formatter 127 * or controller when formatting. When interleaving is in use, 128 * logically adjacent sectors are not physically contiguous, 129 * but instead are separated by some number of sectors. 130 * It is specified as the ratio of physical sectors traversed 131 * per logical sector. Thus an interleave of 1:1 implies contiguous 132 * layout, while 2:1 implies that logical sector 0 is separated 133 * by one sector from logical sector 1. 134 * d_trackskew is the offset of sector 0 on track N 135 * relative to sector 0 on track N-1 on the same cylinder. 136 * Finally, d_cylskew is the offset of sector 0 on cylinder N 137 * relative to sector 0 on cylinder N-1. 138 */ 139 u_short d_rpm; /* rotational speed */ 140 u_short d_interleave; /* hardware sector interleave */ 141 u_short d_trackskew; /* sector 0 skew, per track */ 142 u_short d_cylskew; /* sector 0 skew, per cylinder */ 143 u_long d_headswitch; /* head switch time, usec */ 144 u_long d_trkseek; /* track-to-track seek, usec */ 145 u_long d_flags; /* generic flags */ 146#define NDDATA 5 147 u_long d_drivedata[NDDATA]; /* drive-type specific information */ 148#define NSPARE 5 149 u_long d_spare[NSPARE]; /* reserved for future use */ 150 u_long d_magic2; /* the magic number (again) */ 151 u_short d_checksum; /* xor of data incl. partitions */ 152 153 /* filesystem and partition information: */ 154 u_short d_npartitions; /* number of partitions in following */ 155 u_long d_bbsize; /* size of boot area at sn0, bytes */ 156 u_long d_sbsize; /* max size of fs superblock, bytes */ 157 struct partition { /* the partition table */ 158 u_long p_size; /* number of sectors in partition */ 159 u_long p_offset; /* starting sector */ 160 u_long p_fsize; /* filesystem basic fragment size */ 161 u_char p_fstype; /* filesystem type, see below */ 162 u_char p_frag; /* filesystem fragments per block */ 163 union { 164 u_short cpg; /* UFS: FS cylinders per group */ 165 u_short sgs; /* LFS: FS segment shift */ 166 } __partition_u1; 167#define p_cpg __partition_u1.cpg 168#define p_sgs __partition_u1.sgs 169 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 170}; 171struct cpu_disklabel { 172}; 173#else /* LOCORE */ 174 /* 175 * offsets for asm boot files. 176 */ 177 .set d_secsize,40 178 .set d_nsectors,44 179 .set d_ntracks,48 180 .set d_ncylinders,52 181 .set d_secpercyl,56 182 .set d_secperunit,60 183 .set d_end_,276 /* size of disk label */ 184#endif /* LOCORE */ 185 186/* d_type values: */ 187#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 188#define DTYPE_MSCP 2 /* MSCP */ 189#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 190#define DTYPE_SCSI 4 /* SCSI */ 191#define DTYPE_ESDI 5 /* ESDI interface */ 192#define DTYPE_ST506 6 /* ST506 etc. */ 193#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 194#define DTYPE_HPFL 8 /* HP Fiber-link */ 195#define DTYPE_FLOPPY 10 /* floppy */ 196 197/* d_subtype values: */ 198#define DSTYPE_INDOSPART 0x8 /* is inside dos partition */ 199#define DSTYPE_DOSPART(s) ((s) & 3) /* dos partition number */ 200#define DSTYPE_GEOMETRY 0x10 /* drive params in label */ 201 202#ifdef DKTYPENAMES 203static char *dktypenames[] = { 204 "unknown", 205 "SMD", 206 "MSCP", 207 "old DEC", 208 "SCSI", 209 "ESDI", 210 "ST506", 211 "HP-IB", 212 "HP-FL", 213 "type 9", 214 "floppy", 215 0 216}; 217#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 218#endif 219 220/* 221 * Filesystem type and version. 222 * Used to interpret other filesystem-specific 223 * per-partition information. 224 */ 225#define FS_UNUSED 0 /* unused */ 226#define FS_SWAP 1 /* swap */ 227#define FS_V6 2 /* Sixth Edition */ 228#define FS_V7 3 /* Seventh Edition */ 229#define FS_SYSV 4 /* System V */ 230#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 231#define FS_V8 6 /* Eighth Edition, 4K blocks */ 232#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 233#define FS_MSDOS 8 /* MSDOS file system */ 234#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 235#define FS_OTHER 10 /* in use, but unknown/unsupported */ 236#define FS_HPFS 11 /* OS/2 high-performance file system */ 237#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 238#define FS_BOOT 13 /* partition contains bootstrap */ 239 240#ifdef DKTYPENAMES 241static char *fstypenames[] = { 242 "unused", 243 "swap", 244 "Version 6", 245 "Version 7", 246 "System V", 247 "4.1BSD", 248 "Eighth Edition", 249 "4.2BSD", 250 "MSDOS", 251 "4.4LFS", 252 "unknown", 253 "HPFS", 254 "ISO9660", 255 "boot", 256 0 257}; 258#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 259#endif 260 261/* 262 * flags shared by various drives: 263 */ 264#define D_REMOVABLE 0x01 /* removable media */ 265#define D_ECC 0x02 /* supports ECC */ 266#define D_BADSECT 0x04 /* supports bad sector forw. */ 267#define D_RAMDISK 0x08 /* disk emulator */ 268#define D_CHAIN 0x10 /* can do back-back transfers */ 269 270/* 271 * Drive data for SMD. 272 */ 273#define d_smdflags d_drivedata[0] 274#define D_SSE 0x1 /* supports skip sectoring */ 275#define d_mindist d_drivedata[1] 276#define d_maxdist d_drivedata[2] 277#define d_sdist d_drivedata[3] 278 279/* 280 * Drive data for ST506. 281 */ 282#define d_precompcyl d_drivedata[0] 283#define d_gap3 d_drivedata[1] /* used only when formatting */ 284 285/* 286 * Drive data for SCSI. 287 */ 288#define d_blind d_drivedata[0] 289 290#ifndef LOCORE 291/* 292 * Structure used to perform a format 293 * or other raw operation, returning data 294 * and/or register values. 295 * Register identification and format 296 * are device- and driver-dependent. 297 */ 298struct format_op { 299 char *df_buf; 300 int df_count; /* value-result */ 301 daddr_t df_startblk; 302 int df_reg[8]; /* result */ 303}; 304 305/* 306 * Structure used internally to retrieve 307 * information about a partition on a disk. 308 */ 309struct partinfo { 310 struct disklabel *disklab; 311 struct partition *part; 312}; 313 314/* DOS partition table -- located in boot block */ 315 316#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 317#define DOSPARTOFF 446 318#define NDOSPART 4 319#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 320#define MBR_PTYPE_FreeBSD 0xa5 /* FreeBSD partition type */ 321 322struct dos_partition { 323 unsigned char dp_flag; /* bootstrap flags */ 324 unsigned char dp_shd; /* starting head */ 325 unsigned char dp_ssect; /* starting sector */ 326 unsigned char dp_scyl; /* starting cylinder */ 327 unsigned char dp_typ; /* partition type */ 328 unsigned char dp_ehd; /* end head */ 329 unsigned char dp_esect; /* end sector */ 330 unsigned char dp_ecyl; /* end cylinder */ 331 unsigned long dp_start; /* absolute starting sector number */ 332 unsigned long dp_size; /* partition size in sectors */ 333}; 334 335extern struct dos_partition dos_partitions[NDOSPART]; 336 337#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 338#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 339 340/* 341 * Disk-specific ioctls. 342 */ 343 /* get and set disklabel; DIOCGPART used internally */ 344#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 345#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 346#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 347#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 348 349/* do format operation, read or write */ 350#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 351#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 352 353#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 354#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 355#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 356 357#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 358 359#endif /* LOCORE */ 360 361#if !defined(KERNEL) && !defined(LOCORE) 362 363#include <sys/cdefs.h> 364 365__BEGIN_DECLS 366struct disklabel *getdiskbyname __P((const char *)); 367__END_DECLS 368 369#endif 370 371#endif 372