1 /* 2 * Copyright (c) 1987, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)disklabel.h 8.2 (Berkeley) 07/10/94 8 */ 9 10 /* 11 * Disk description table, see disktab(5) 12 */ 13 #define _PATH_DISKTAB "/etc/disktab" 14 #define DISKTAB "/etc/disktab" /* deprecated */ 15 16 /* 17 * Each disk has a label which includes information about the hardware 18 * disk geometry, filesystem partitions, and drive specific information. 19 * The label is in block 0 or 1, possibly offset from the beginning 20 * to leave room for a bootstrap, etc. 21 */ 22 23 /* XXX these should be defined per controller (or drive) elsewhere, not here! */ 24 #ifdef i386 25 #define LABELSECTOR 1 /* sector containing label */ 26 #define LABELOFFSET 0 /* offset of label in sector */ 27 #endif 28 29 #ifndef LABELSECTOR 30 #define LABELSECTOR 0 /* sector containing label */ 31 #endif 32 33 #ifndef LABELOFFSET 34 #define LABELOFFSET 64 /* offset of label in sector */ 35 #endif 36 37 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 38 #ifndef MAXPARTITIONS 39 #define MAXPARTITIONS 8 40 #endif 41 42 43 #ifndef LOCORE 44 struct disklabel { 45 u_int32_t d_magic; /* the magic number */ 46 u_int16_t d_type; /* drive type */ 47 u_int16_t d_subtype; /* controller/d_type specific */ 48 char d_typename[16]; /* type name, e.g. "eagle" */ 49 50 /* 51 * d_packname contains the pack identifier and is returned when 52 * the disklabel is read off the disk or in-core copy. 53 * d_boot0 and d_boot1 are the (optional) names of the 54 * primary (block 0) and secondary (block 1-15) bootstraps 55 * as found in /usr/mdec. These are returned when using 56 * getdiskbyname(3) to retrieve the values from /etc/disktab. 57 */ 58 #if defined(KERNEL) || defined(STANDALONE) 59 char d_packname[16]; /* pack identifier */ 60 #else 61 union { 62 char un_d_packname[16]; /* pack identifier */ 63 struct { 64 char *un_d_boot0; /* primary bootstrap name */ 65 char *un_d_boot1; /* secondary bootstrap name */ 66 } un_b; 67 } d_un; 68 #define d_packname d_un.un_d_packname 69 #define d_boot0 d_un.un_b.un_d_boot0 70 #define d_boot1 d_un.un_b.un_d_boot1 71 #endif /* ! KERNEL or STANDALONE */ 72 73 /* disk geometry: */ 74 u_int32_t d_secsize; /* # of bytes per sector */ 75 u_int32_t d_nsectors; /* # of data sectors per track */ 76 u_int32_t d_ntracks; /* # of tracks per cylinder */ 77 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 78 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 79 u_int32_t d_secperunit; /* # of data sectors per unit */ 80 81 /* 82 * Spares (bad sector replacements) below are not counted in 83 * d_nsectors or d_secpercyl. Spare sectors are assumed to 84 * be physical sectors which occupy space at the end of each 85 * track and/or cylinder. 86 */ 87 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 88 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 89 /* 90 * Alternate cylinders include maintenance, replacement, configuration 91 * description areas, etc. 92 */ 93 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 94 95 /* hardware characteristics: */ 96 /* 97 * d_interleave, d_trackskew and d_cylskew describe perturbations 98 * in the media format used to compensate for a slow controller. 99 * Interleave is physical sector interleave, set up by the 100 * formatter or controller when formatting. When interleaving is 101 * in use, logically adjacent sectors are not physically 102 * contiguous, but instead are separated by some number of 103 * sectors. It is specified as the ratio of physical sectors 104 * traversed per logical sector. Thus an interleave of 1:1 105 * implies contiguous layout, while 2:1 implies that logical 106 * sector 0 is separated by one sector from logical sector 1. 107 * d_trackskew is the offset of sector 0 on track N relative to 108 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 109 * is the offset of sector 0 on cylinder N relative to sector 0 110 * on cylinder N-1. 111 */ 112 u_int16_t d_rpm; /* rotational speed */ 113 u_int16_t d_interleave; /* hardware sector interleave */ 114 u_int16_t d_trackskew; /* sector 0 skew, per track */ 115 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 116 u_int32_t d_headswitch; /* head switch time, usec */ 117 u_int32_t d_trkseek; /* track-to-track seek, usec */ 118 u_int32_t d_flags; /* generic flags */ 119 #define NDDATA 5 120 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 121 #define NSPARE 5 122 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 123 u_int32_t d_magic2; /* the magic number (again) */ 124 u_int16_t d_checksum; /* xor of data incl. partitions */ 125 126 /* filesystem and partition information: */ 127 u_int16_t d_npartitions; /* number of partitions in following */ 128 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 129 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 130 struct partition { /* the partition table */ 131 u_int32_t p_size; /* number of sectors in partition */ 132 u_int32_t p_offset; /* starting sector */ 133 u_int32_t p_fsize; /* filesystem basic fragment size */ 134 u_int8_t p_fstype; /* filesystem type, see below */ 135 u_int8_t p_frag; /* filesystem fragments per block */ 136 union { 137 u_int16_t cpg; /* UFS: FS cylinders per group */ 138 u_int16_t sgs; /* LFS: FS segment shift */ 139 } __partition_u1; 140 #define p_cpg __partition_u1.cpg 141 #define p_sgs __partition_u1.sgs 142 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 143 }; 144 #else /* LOCORE */ 145 /* 146 * offsets for asm boot files. 147 */ 148 .set d_secsize,40 149 .set d_nsectors,44 150 .set d_ntracks,48 151 .set d_ncylinders,52 152 .set d_secpercyl,56 153 .set d_secperunit,60 154 .set d_end_,276 /* size of disk label */ 155 #endif /* LOCORE */ 156 157 /* d_type values: */ 158 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 159 #define DTYPE_MSCP 2 /* MSCP */ 160 #define DTYPE_DEC 3 /* other DEC (rk, rl) */ 161 #define DTYPE_SCSI 4 /* SCSI */ 162 #define DTYPE_ESDI 5 /* ESDI interface */ 163 #define DTYPE_ST506 6 /* ST506 etc. */ 164 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 165 #define DTYPE_HPFL 8 /* HP Fiber-link */ 166 #define DTYPE_FLOPPY 10 /* floppy */ 167 168 #ifdef DKTYPENAMES 169 static char *dktypenames[] = { 170 "unknown", 171 "SMD", 172 "MSCP", 173 "old DEC", 174 "SCSI", 175 "ESDI", 176 "ST506", 177 "HP-IB", 178 "HP-FL", 179 "type 9", 180 "floppy", 181 NULL 182 }; 183 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 184 #endif 185 186 /* 187 * Filesystem type and version. 188 * Used to interpret other filesystem-specific 189 * per-partition information. 190 */ 191 #define FS_UNUSED 0 /* unused */ 192 #define FS_SWAP 1 /* swap */ 193 #define FS_V6 2 /* Sixth Edition */ 194 #define FS_V7 3 /* Seventh Edition */ 195 #define FS_SYSV 4 /* System V */ 196 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 197 #define FS_V8 6 /* Eighth Edition, 4K blocks */ 198 #define FS_BSDFFS 7 /* 4.2BSD fast file system */ 199 #define FS_MSDOS 8 /* MSDOS file system */ 200 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 201 #define FS_OTHER 10 /* in use, but unknown/unsupported */ 202 #define FS_HPFS 11 /* OS/2 high-performance file system */ 203 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 204 #define FS_BOOT 13 /* partition contains bootstrap */ 205 206 #ifdef DKTYPENAMES 207 static char *fstypenames[] = { 208 "unused", 209 "swap", 210 "Version 6", 211 "Version 7", 212 "System V", 213 "4.1BSD", 214 "Eighth Edition", 215 "4.2BSD", 216 "MSDOS", 217 "4.4LFS", 218 "unknown", 219 "HPFS", 220 "ISO9660", 221 "boot", 222 NULL 223 }; 224 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 225 #endif 226 227 /* 228 * flags shared by various drives: 229 */ 230 #define D_REMOVABLE 0x01 /* removable media */ 231 #define D_ECC 0x02 /* supports ECC */ 232 #define D_BADSECT 0x04 /* supports bad sector forw. */ 233 #define D_RAMDISK 0x08 /* disk emulator */ 234 #define D_CHAIN 0x10 /* can do back-back transfers */ 235 236 /* 237 * Drive data for SMD. 238 */ 239 #define d_smdflags d_drivedata[0] 240 #define D_SSE 0x1 /* supports skip sectoring */ 241 #define d_mindist d_drivedata[1] 242 #define d_maxdist d_drivedata[2] 243 #define d_sdist d_drivedata[3] 244 245 /* 246 * Drive data for ST506. 247 */ 248 #define d_precompcyl d_drivedata[0] 249 #define d_gap3 d_drivedata[1] /* used only when formatting */ 250 251 /* 252 * Drive data for SCSI. 253 */ 254 #define d_blind d_drivedata[0] 255 256 #ifndef LOCORE 257 /* 258 * Structure used to perform a format or other raw operation, returning 259 * data and/or register values. Register identification and format 260 * are device- and driver-dependent. 261 */ 262 struct format_op { 263 char *df_buf; 264 int df_count; /* value-result */ 265 daddr_t df_startblk; 266 int df_reg[8]; /* result */ 267 }; 268 269 /* 270 * Structure used internally to retrieve information about a partition 271 * on a disk. 272 */ 273 struct partinfo { 274 struct disklabel *disklab; 275 struct partition *part; 276 }; 277 278 /* 279 * Disk-specific ioctls. 280 */ 281 /* get and set disklabel; DIOCGPART used internally */ 282 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 283 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 284 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 285 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 286 287 /* do format operation, read or write */ 288 #define DIOCRFORMAT _IOWR('d', 105, struct format_op) 289 #define DIOCWFORMAT _IOWR('d', 106, struct format_op) 290 291 #define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 292 #define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 293 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 294 295 #define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 296 297 #endif /* LOCORE */ 298 299 #if !defined(KERNEL) && !defined(LOCORE) 300 301 #include <sys/cdefs.h> 302 303 __BEGIN_DECLS 304 struct disklabel *getdiskbyname __P((const char *)); 305 __END_DECLS 306 307 #endif 308