disklabel.h revision 1549
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 */ 35 36/* 37 * Disk description table, see disktab(5) 38 */ 39#define _PATH_DISKTAB "/etc/disktab" 40#define DISKTAB "/etc/disktab" /* deprecated */ 41 42/* 43 * Each disk has a label which includes information about the hardware 44 * disk geometry, filesystem partitions, and drive specific information. 45 * The label is in block 0 or 1, possibly offset from the beginning 46 * to leave room for a bootstrap, etc. 47 */ 48 49/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 50#ifdef i386 51#define LABELSECTOR 1 /* sector containing label */ 52#define LABELOFFSET 0 /* offset of label in sector */ 53#endif 54 55#ifndef LABELSECTOR 56#define LABELSECTOR 0 /* sector containing label */ 57#endif 58 59#ifndef LABELOFFSET 60#define LABELOFFSET 64 /* offset of label in sector */ 61#endif 62 63#define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */ 64#ifndef MAXPARTITIONS 65#define MAXPARTITIONS 8 66#endif 67 68 69#ifndef LOCORE 70struct disklabel { 71 u_long d_magic; /* the magic number */ 72 short d_type; /* drive type */ 73 short d_subtype; /* controller/d_type specific */ 74 char d_typename[16]; /* type name, e.g. "eagle" */ 75 /* 76 * d_packname contains the pack identifier and is returned when 77 * the disklabel is read off the disk or in-core copy. 78 * d_boot0 and d_boot1 are the (optional) names of the 79 * primary (block 0) and secondary (block 1-15) bootstraps 80 * as found in /usr/mdec. These are returned when using 81 * getdiskbyname(3) to retrieve the values from /etc/disktab. 82 */ 83#if defined(KERNEL) || defined(STANDALONE) 84 char d_packname[16]; /* pack identifier */ 85#else 86 union { 87 char un_d_packname[16]; /* pack identifier */ 88 struct { 89 char *un_d_boot0; /* primary bootstrap name */ 90 char *un_d_boot1; /* secondary bootstrap name */ 91 } un_b; 92 } d_un; 93#define d_packname d_un.un_d_packname 94#define d_boot0 d_un.un_b.un_d_boot0 95#define d_boot1 d_un.un_b.un_d_boot1 96#endif /* ! KERNEL or STANDALONE */ 97 /* disk geometry: */ 98 u_long d_secsize; /* # of bytes per sector */ 99 u_long d_nsectors; /* # of data sectors per track */ 100 u_long d_ntracks; /* # of tracks per cylinder */ 101 u_long d_ncylinders; /* # of data cylinders per unit */ 102 u_long d_secpercyl; /* # of data sectors per cylinder */ 103 u_long d_secperunit; /* # of data sectors per unit */ 104 /* 105 * Spares (bad sector replacements) below 106 * are not counted in d_nsectors or d_secpercyl. 107 * Spare sectors are assumed to be physical sectors 108 * which occupy space at the end of each track and/or cylinder. 109 */ 110 u_short d_sparespertrack; /* # of spare sectors per track */ 111 u_short d_sparespercyl; /* # of spare sectors per cylinder */ 112 /* 113 * Alternate cylinders include maintenance, replacement, 114 * configuration description areas, etc. 115 */ 116 u_long d_acylinders; /* # of alt. cylinders per unit */ 117 118 /* hardware characteristics: */ 119 /* 120 * d_interleave, d_trackskew and d_cylskew describe perturbations 121 * in the media format used to compensate for a slow controller. 122 * Interleave is physical sector interleave, set up by the formatter 123 * or controller when formatting. When interleaving is in use, 124 * logically adjacent sectors are not physically contiguous, 125 * but instead are separated by some number of sectors. 126 * It is specified as the ratio of physical sectors traversed 127 * per logical sector. Thus an interleave of 1:1 implies contiguous 128 * layout, while 2:1 implies that logical sector 0 is separated 129 * by one sector from logical sector 1. 130 * d_trackskew is the offset of sector 0 on track N 131 * relative to sector 0 on track N-1 on the same cylinder. 132 * Finally, d_cylskew is the offset of sector 0 on cylinder N 133 * relative to sector 0 on cylinder N-1. 134 */ 135 u_short d_rpm; /* rotational speed */ 136 u_short d_interleave; /* hardware sector interleave */ 137 u_short d_trackskew; /* sector 0 skew, per track */ 138 u_short d_cylskew; /* sector 0 skew, per cylinder */ 139 u_long d_headswitch; /* head switch time, usec */ 140 u_long d_trkseek; /* track-to-track seek, usec */ 141 u_long d_flags; /* generic flags */ 142#define NDDATA 5 143 u_long d_drivedata[NDDATA]; /* drive-type specific information */ 144#define NSPARE 5 145 u_long d_spare[NSPARE]; /* reserved for future use */ 146 u_long d_magic2; /* the magic number (again) */ 147 u_short d_checksum; /* xor of data incl. partitions */ 148 149 /* filesystem and partition information: */ 150 u_short d_npartitions; /* number of partitions in following */ 151 u_long d_bbsize; /* size of boot area at sn0, bytes */ 152 u_long d_sbsize; /* max size of fs superblock, bytes */ 153 struct partition { /* the partition table */ 154 u_long p_size; /* number of sectors in partition */ 155 u_long p_offset; /* starting sector */ 156 u_long p_fsize; /* filesystem basic fragment size */ 157 u_char p_fstype; /* filesystem type, see below */ 158 u_char p_frag; /* filesystem fragments per block */ 159 union { 160 u_short cpg; /* UFS: FS cylinders per group */ 161 u_short sgs; /* LFS: FS segment shift */ 162 } __partition_u1; 163#define p_cpg __partition_u1.cpg 164#define p_sgs __partition_u1.sgs 165 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 166}; 167struct cpu_disklabel { 168}; 169#else /* LOCORE */ 170 /* 171 * offsets for asm boot files. 172 */ 173 .set d_secsize,40 174 .set d_nsectors,44 175 .set d_ntracks,48 176 .set d_ncylinders,52 177 .set d_secpercyl,56 178 .set d_secperunit,60 179 .set d_end_,276 /* size of disk label */ 180#endif /* LOCORE */ 181 182/* d_type values: */ 183#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 184#define DTYPE_MSCP 2 /* MSCP */ 185#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 186#define DTYPE_SCSI 4 /* SCSI */ 187#define DTYPE_ESDI 5 /* ESDI interface */ 188#define DTYPE_ST506 6 /* ST506 etc. */ 189#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 190#define DTYPE_HPFL 8 /* HP Fiber-link */ 191#define DTYPE_FLOPPY 10 /* floppy */ 192 193/* d_subtype values: */ 194#define DSTYPE_INDOSPART 0x8 /* is inside dos partition */ 195#define DSTYPE_DOSPART(s) ((s) & 3) /* dos partition number */ 196#define DSTYPE_GEOMETRY 0x10 /* drive params in label */ 197 198#ifdef DKTYPENAMES 199static char *dktypenames[] = { 200 "unknown", 201 "SMD", 202 "MSCP", 203 "old DEC", 204 "SCSI", 205 "ESDI", 206 "ST506", 207 "HP-IB", 208 "HP-FL", 209 "type 9", 210 "floppy", 211 0 212}; 213#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 214#endif 215 216/* 217 * Filesystem type and version. 218 * Used to interpret other filesystem-specific 219 * per-partition information. 220 */ 221#define FS_UNUSED 0 /* unused */ 222#define FS_SWAP 1 /* swap */ 223#define FS_V6 2 /* Sixth Edition */ 224#define FS_V7 3 /* Seventh Edition */ 225#define FS_SYSV 4 /* System V */ 226#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 227#define FS_V8 6 /* Eighth Edition, 4K blocks */ 228#define FS_BSDFFS 7 /* 4.2BSD fast file system */ 229#define FS_MSDOS 8 /* MSDOS file system */ 230#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 231#define FS_OTHER 10 /* in use, but unknown/unsupported */ 232#define FS_HPFS 11 /* OS/2 high-performance file system */ 233#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 234#define FS_BOOT 13 /* partition contains bootstrap */ 235 236#ifdef DKTYPENAMES 237static char *fstypenames[] = { 238 "unused", 239 "swap", 240 "Version 6", 241 "Version 7", 242 "System V", 243 "4.1BSD", 244 "Eighth Edition", 245 "4.2BSD", 246 "MSDOS", 247 "4.4LFS", 248 "unknown", 249 "HPFS", 250 "ISO9660", 251 "boot", 252 0 253}; 254#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 255#endif 256 257/* 258 * flags shared by various drives: 259 */ 260#define D_REMOVABLE 0x01 /* removable media */ 261#define D_ECC 0x02 /* supports ECC */ 262#define D_BADSECT 0x04 /* supports bad sector forw. */ 263#define D_RAMDISK 0x08 /* disk emulator */ 264#define D_CHAIN 0x10 /* can do back-back transfers */ 265 266/* 267 * Drive data for SMD. 268 */ 269#define d_smdflags d_drivedata[0] 270#define D_SSE 0x1 /* supports skip sectoring */ 271#define d_mindist d_drivedata[1] 272#define d_maxdist d_drivedata[2] 273#define d_sdist d_drivedata[3] 274 275/* 276 * Drive data for ST506. 277 */ 278#define d_precompcyl d_drivedata[0] 279#define d_gap3 d_drivedata[1] /* used only when formatting */ 280 281/* 282 * Drive data for SCSI. 283 */ 284#define d_blind d_drivedata[0] 285 286#ifndef LOCORE 287/* 288 * Structure used to perform a format 289 * or other raw operation, returning data 290 * and/or register values. 291 * Register identification and format 292 * are device- and driver-dependent. 293 */ 294struct format_op { 295 char *df_buf; 296 int df_count; /* value-result */ 297 daddr_t df_startblk; 298 int df_reg[8]; /* result */ 299}; 300 301/* 302 * Structure used internally to retrieve 303 * information about a partition on a disk. 304 */ 305struct partinfo { 306 struct disklabel *disklab; 307 struct partition *part; 308}; 309 310/* DOS partition table -- located in boot block */ 311 312#define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 313#define DOSPARTOFF 446 314#define NDOSPART 4 315 316struct dos_partition { 317 unsigned char dp_flag; /* bootstrap flags */ 318 unsigned char dp_shd; /* starting head */ 319 unsigned char dp_ssect; /* starting sector */ 320 unsigned char dp_scyl; /* starting cylinder */ 321 unsigned char dp_typ; /* partition type */ 322#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 323 unsigned char dp_ehd; /* end head */ 324 unsigned char dp_esect; /* end sector */ 325 unsigned char dp_ecyl; /* end cylinder */ 326 unsigned long dp_start; /* absolute starting sector number */ 327 unsigned long dp_size; /* partition size in sectors */ 328}; 329 330extern struct dos_partition dos_partitions[NDOSPART]; 331 332#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 333#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 334 335/* 336 * Disk-specific ioctls. 337 */ 338 /* get and set disklabel; DIOCGPART used internally */ 339#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 340#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 341#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 342#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 343 344/* do format operation, read or write */ 345#define DIOCRFORMAT _IOWR('d', 105, struct format_op) 346#define DIOCWFORMAT _IOWR('d', 106, struct format_op) 347 348#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 349#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 350#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 351 352#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 353 354#endif /* LOCORE */ 355 356#if !defined(KERNEL) && !defined(LOCORE) 357 358#include <sys/cdefs.h> 359 360__BEGIN_DECLS 361struct disklabel *getdiskbyname __P((const char *)); 362__END_DECLS 363 364#endif 365