1 /* 2 * Copyright (c) 1987, 1988 Regents of the University of California. 3 * 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 7.19 (Berkeley) 5/7/91 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 70 struct 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 u_short p_cpg; /* filesystem cylinders per group */ 160 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 161 }; 162 #else LOCORE 163 /* 164 * offsets for asm boot files. 165 */ 166 .set d_secsize,40 167 .set d_nsectors,44 168 .set d_ntracks,48 169 .set d_ncylinders,52 170 .set d_secpercyl,56 171 .set d_secperunit,60 172 .set d_end_,276 /* size of disk label */ 173 #endif LOCORE 174 175 /* d_type values: */ 176 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 177 #define DTYPE_MSCP 2 /* MSCP */ 178 #define DTYPE_DEC 3 /* other DEC (rk, rl) */ 179 #define DTYPE_SCSI 4 /* SCSI */ 180 #define DTYPE_ESDI 5 /* ESDI interface */ 181 #define DTYPE_ST506 6 /* ST506 etc. */ 182 #define DTYPE_FLOPPY 10 /* floppy */ 183 184 /* d_subtype values: */ 185 #define DSTYPE_INDOSPART 0x8 /* is inside dos partition */ 186 #define DSTYPE_DOSPART(s) ((s) & 3) /* dos partition number */ 187 #define DSTYPE_GEOMETRY 0x10 /* drive params in label */ 188 189 #ifdef DKTYPENAMES 190 static char *dktypenames[] = { 191 "unknown", 192 "SMD", 193 "MSCP", 194 "old DEC", 195 "SCSI", 196 "ESDI", 197 "ST506", 198 "type 7", 199 "type 8", 200 "type 9", 201 "floppy", 202 0 203 }; 204 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 205 #endif 206 207 /* 208 * Filesystem type and version. 209 * Used to interpret other filesystem-specific 210 * per-partition information. 211 */ 212 #define FS_UNUSED 0 /* unused */ 213 #define FS_SWAP 1 /* swap */ 214 #define FS_V6 2 /* Sixth Edition */ 215 #define FS_V7 3 /* Seventh Edition */ 216 #define FS_SYSV 4 /* System V */ 217 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 218 #define FS_V8 6 /* Eighth Edition, 4K blocks */ 219 #define FS_BSDFFS 7 /* 4.2BSD fast file system */ 220 #define FS_MSDOS 8 /* MSDOS file system */ 221 222 #ifdef DKTYPENAMES 223 static char *fstypenames[] = { 224 "unused", 225 "swap", 226 "Version 6", 227 "Version 7", 228 "System V", 229 "4.1BSD", 230 "Eighth Edition", 231 "4.2BSD", 232 "MSDOS", 233 0 234 }; 235 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 236 #endif 237 238 /* 239 * flags shared by various drives: 240 */ 241 #define D_REMOVABLE 0x01 /* removable media */ 242 #define D_ECC 0x02 /* supports ECC */ 243 #define D_BADSECT 0x04 /* supports bad sector forw. */ 244 #define D_RAMDISK 0x08 /* disk emulator */ 245 #define D_CHAIN 0x10 /* can do back-back transfers */ 246 #define D_DOSPART 0x20 /* within MSDOS partition */ 247 #define D_DOSINDIR 0x40 /* unified MSDOS partitions */ 248 249 /* 250 * Drive data for SMD. 251 */ 252 #define d_smdflags d_drivedata[0] 253 #define D_SSE 0x1 /* supports skip sectoring */ 254 #define d_mindist d_drivedata[1] 255 #define d_maxdist d_drivedata[2] 256 #define d_sdist d_drivedata[3] 257 258 /* 259 * Drive data for ST506. 260 */ 261 #define d_precompcyl d_drivedata[0] 262 #define d_gap3 d_drivedata[1] /* used only when formatting */ 263 264 /* 265 * Drive data for SCSI. 266 */ 267 #define d_blind d_drivedata[0] 268 269 #ifndef LOCORE 270 /* 271 * Structure used to perform a format 272 * or other raw operation, returning data 273 * and/or register values. 274 * Register identification and format 275 * are device- and driver-dependent. 276 */ 277 struct format_op { 278 char *df_buf; 279 int df_count; /* value-result */ 280 daddr_t df_startblk; 281 int df_reg[8]; /* result */ 282 }; 283 284 /* 285 * Structure used internally to retrieve 286 * information about a partition on a disk. 287 */ 288 struct partinfo { 289 struct disklabel *disklab; 290 struct partition *part; 291 }; 292 293 /* DOS partition table -- located in boot block */ 294 295 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */ 296 #define DOSPARTOFF 446 297 #define NDOSPART 4 298 299 struct dos_partition { 300 unsigned char dp_flag; /* bootstrap flags */ 301 unsigned char dp_shd; /* starting head */ 302 unsigned char dp_ssect; /* starting sector */ 303 unsigned char dp_scyl; /* starting cylinder */ 304 unsigned char dp_typ; /* partition type */ 305 #define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */ 306 unsigned char dp_ehd; /* end head */ 307 unsigned char dp_esect; /* end sector */ 308 unsigned char dp_ecyl; /* end cylinder */ 309 unsigned long dp_start; /* absolute starting sector number */ 310 unsigned long dp_size; /* partition size in sectors */ 311 } dos_partitions[NDOSPART]; 312 313 #define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */ 314 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */ 315 316 /* 317 * Disk-specific ioctls. 318 */ 319 /* get and set disklabel; DIOCGPART used internally */ 320 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 321 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 322 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 323 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 324 325 /* do format operation, read or write */ 326 #define DIOCRFORMAT _IOWR('d', 105, struct format_op) 327 #define DIOCWFORMAT _IOWR('d', 106, struct format_op) 328 329 #define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 330 #define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 331 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 332 333 #define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 334 335 #if defined(KERNEL) 336 337 338 void diskerr(struct buf *, char *, char *, int, int, struct disklabel *); 339 340 int dkcksum(struct disklabel *); 341 342 int setdisklabel(struct disklabel *, struct disklabel *, u_long, 343 struct dos_partition *); 344 345 char *readdisklabel(int, int (*)(), struct disklabel *, 346 struct dos_partition *, struct dkbad *, struct buf **); 347 348 void disksort(struct buf *, struct buf *); 349 350 int writedisklabel(int, int (*)(), struct disklabel *, 351 struct dos_partition *); 352 353 int bounds_check_with_label(struct buf *, struct disklabel *, int); 354 #endif 355 #endif LOCORE 356 357 #if !defined(KERNEL) && !defined(LOCORE) 358 359 #include <sys/cdefs.h> 360 361 __BEGIN_DECLS 362 struct disklabel *getdiskbyname __P((const char *)); 363 __END_DECLS 364 365 #endif 366