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 8.1 (Berkeley) 06/02/93 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_long) 0x82564557) /* The disk magic number */ 38 #ifndef MAXPARTITIONS 39 #define MAXPARTITIONS 8 40 #endif 41 42 43 #ifndef LOCORE 44 struct disklabel { 45 u_long d_magic; /* the magic number */ 46 short d_type; /* drive type */ 47 short d_subtype; /* controller/d_type specific */ 48 char d_typename[16]; /* type name, e.g. "eagle" */ 49 /* 50 * d_packname contains the pack identifier and is returned when 51 * the disklabel is read off the disk or in-core copy. 52 * d_boot0 and d_boot1 are the (optional) names of the 53 * primary (block 0) and secondary (block 1-15) bootstraps 54 * as found in /usr/mdec. These are returned when using 55 * getdiskbyname(3) to retrieve the values from /etc/disktab. 56 */ 57 #if defined(KERNEL) || defined(STANDALONE) 58 char d_packname[16]; /* pack identifier */ 59 #else 60 union { 61 char un_d_packname[16]; /* pack identifier */ 62 struct { 63 char *un_d_boot0; /* primary bootstrap name */ 64 char *un_d_boot1; /* secondary bootstrap name */ 65 } un_b; 66 } d_un; 67 #define d_packname d_un.un_d_packname 68 #define d_boot0 d_un.un_b.un_d_boot0 69 #define d_boot1 d_un.un_b.un_d_boot1 70 #endif /* ! KERNEL or STANDALONE */ 71 /* disk geometry: */ 72 u_long d_secsize; /* # of bytes per sector */ 73 u_long d_nsectors; /* # of data sectors per track */ 74 u_long d_ntracks; /* # of tracks per cylinder */ 75 u_long d_ncylinders; /* # of data cylinders per unit */ 76 u_long d_secpercyl; /* # of data sectors per cylinder */ 77 u_long d_secperunit; /* # of data sectors per unit */ 78 /* 79 * Spares (bad sector replacements) below 80 * are not counted in d_nsectors or d_secpercyl. 81 * Spare sectors are assumed to be physical sectors 82 * which occupy space at the end of each track and/or cylinder. 83 */ 84 u_short d_sparespertrack; /* # of spare sectors per track */ 85 u_short d_sparespercyl; /* # of spare sectors per cylinder */ 86 /* 87 * Alternate cylinders include maintenance, replacement, 88 * configuration description areas, etc. 89 */ 90 u_long d_acylinders; /* # of alt. cylinders per unit */ 91 92 /* hardware characteristics: */ 93 /* 94 * d_interleave, d_trackskew and d_cylskew describe perturbations 95 * in the media format used to compensate for a slow controller. 96 * Interleave is physical sector interleave, set up by the formatter 97 * or controller when formatting. When interleaving is in use, 98 * logically adjacent sectors are not physically contiguous, 99 * but instead are separated by some number of sectors. 100 * It is specified as the ratio of physical sectors traversed 101 * per logical sector. Thus an interleave of 1:1 implies contiguous 102 * layout, while 2:1 implies that logical sector 0 is separated 103 * by one sector from logical sector 1. 104 * d_trackskew is the offset of sector 0 on track N 105 * relative to sector 0 on track N-1 on the same cylinder. 106 * Finally, d_cylskew is the offset of sector 0 on cylinder N 107 * relative to sector 0 on cylinder N-1. 108 */ 109 u_short d_rpm; /* rotational speed */ 110 u_short d_interleave; /* hardware sector interleave */ 111 u_short d_trackskew; /* sector 0 skew, per track */ 112 u_short d_cylskew; /* sector 0 skew, per cylinder */ 113 u_long d_headswitch; /* head switch time, usec */ 114 u_long d_trkseek; /* track-to-track seek, usec */ 115 u_long d_flags; /* generic flags */ 116 #define NDDATA 5 117 u_long d_drivedata[NDDATA]; /* drive-type specific information */ 118 #define NSPARE 5 119 u_long d_spare[NSPARE]; /* reserved for future use */ 120 u_long d_magic2; /* the magic number (again) */ 121 u_short d_checksum; /* xor of data incl. partitions */ 122 123 /* filesystem and partition information: */ 124 u_short d_npartitions; /* number of partitions in following */ 125 u_long d_bbsize; /* size of boot area at sn0, bytes */ 126 u_long d_sbsize; /* max size of fs superblock, bytes */ 127 struct partition { /* the partition table */ 128 u_long p_size; /* number of sectors in partition */ 129 u_long p_offset; /* starting sector */ 130 u_long p_fsize; /* filesystem basic fragment size */ 131 u_char p_fstype; /* filesystem type, see below */ 132 u_char p_frag; /* filesystem fragments per block */ 133 union { 134 u_short cpg; /* UFS: FS cylinders per group */ 135 u_short sgs; /* LFS: FS segment shift */ 136 } __partition_u1; 137 #define p_cpg __partition_u1.cpg 138 #define p_sgs __partition_u1.sgs 139 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 140 }; 141 #else /* LOCORE */ 142 /* 143 * offsets for asm boot files. 144 */ 145 .set d_secsize,40 146 .set d_nsectors,44 147 .set d_ntracks,48 148 .set d_ncylinders,52 149 .set d_secpercyl,56 150 .set d_secperunit,60 151 .set d_end_,276 /* size of disk label */ 152 #endif /* LOCORE */ 153 154 /* d_type values: */ 155 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 156 #define DTYPE_MSCP 2 /* MSCP */ 157 #define DTYPE_DEC 3 /* other DEC (rk, rl) */ 158 #define DTYPE_SCSI 4 /* SCSI */ 159 #define DTYPE_ESDI 5 /* ESDI interface */ 160 #define DTYPE_ST506 6 /* ST506 etc. */ 161 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 162 #define DTYPE_HPFL 8 /* HP Fiber-link */ 163 #define DTYPE_FLOPPY 10 /* floppy */ 164 165 #ifdef DKTYPENAMES 166 static char *dktypenames[] = { 167 "unknown", 168 "SMD", 169 "MSCP", 170 "old DEC", 171 "SCSI", 172 "ESDI", 173 "ST506", 174 "HP-IB", 175 "HP-FL", 176 "type 9", 177 "floppy", 178 0 179 }; 180 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 181 #endif 182 183 /* 184 * Filesystem type and version. 185 * Used to interpret other filesystem-specific 186 * per-partition information. 187 */ 188 #define FS_UNUSED 0 /* unused */ 189 #define FS_SWAP 1 /* swap */ 190 #define FS_V6 2 /* Sixth Edition */ 191 #define FS_V7 3 /* Seventh Edition */ 192 #define FS_SYSV 4 /* System V */ 193 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 194 #define FS_V8 6 /* Eighth Edition, 4K blocks */ 195 #define FS_BSDFFS 7 /* 4.2BSD fast file system */ 196 #define FS_MSDOS 8 /* MSDOS file system */ 197 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */ 198 #define FS_OTHER 10 /* in use, but unknown/unsupported */ 199 #define FS_HPFS 11 /* OS/2 high-performance file system */ 200 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 201 #define FS_BOOT 13 /* partition contains bootstrap */ 202 203 #ifdef DKTYPENAMES 204 static char *fstypenames[] = { 205 "unused", 206 "swap", 207 "Version 6", 208 "Version 7", 209 "System V", 210 "4.1BSD", 211 "Eighth Edition", 212 "4.2BSD", 213 "MSDOS", 214 "4.4LFS", 215 "unknown", 216 "HPFS", 217 "ISO9660", 218 "boot", 219 0 220 }; 221 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 222 #endif 223 224 /* 225 * flags shared by various drives: 226 */ 227 #define D_REMOVABLE 0x01 /* removable media */ 228 #define D_ECC 0x02 /* supports ECC */ 229 #define D_BADSECT 0x04 /* supports bad sector forw. */ 230 #define D_RAMDISK 0x08 /* disk emulator */ 231 #define D_CHAIN 0x10 /* can do back-back transfers */ 232 233 /* 234 * Drive data for SMD. 235 */ 236 #define d_smdflags d_drivedata[0] 237 #define D_SSE 0x1 /* supports skip sectoring */ 238 #define d_mindist d_drivedata[1] 239 #define d_maxdist d_drivedata[2] 240 #define d_sdist d_drivedata[3] 241 242 /* 243 * Drive data for ST506. 244 */ 245 #define d_precompcyl d_drivedata[0] 246 #define d_gap3 d_drivedata[1] /* used only when formatting */ 247 248 /* 249 * Drive data for SCSI. 250 */ 251 #define d_blind d_drivedata[0] 252 253 #ifndef LOCORE 254 /* 255 * Structure used to perform a format 256 * or other raw operation, returning data 257 * and/or register values. 258 * Register identification and format 259 * are device- and driver-dependent. 260 */ 261 struct format_op { 262 char *df_buf; 263 int df_count; /* value-result */ 264 daddr_t df_startblk; 265 int df_reg[8]; /* result */ 266 }; 267 268 /* 269 * Structure used internally to retrieve 270 * information about a partition on a disk. 271 */ 272 struct partinfo { 273 struct disklabel *disklab; 274 struct partition *part; 275 }; 276 277 /* 278 * Disk-specific ioctls. 279 */ 280 /* get and set disklabel; DIOCGPART used internally */ 281 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 282 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 283 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 284 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 285 286 /* do format operation, read or write */ 287 #define DIOCRFORMAT _IOWR('d', 105, struct format_op) 288 #define DIOCWFORMAT _IOWR('d', 106, struct format_op) 289 290 #define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 291 #define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 292 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 293 294 #define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 295 296 #endif /* LOCORE */ 297 298 #if !defined(KERNEL) && !defined(LOCORE) 299 300 #include <sys/cdefs.h> 301 302 __BEGIN_DECLS 303 struct disklabel *getdiskbyname __P((const char *)); 304 __END_DECLS 305 306 #endif 307