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 are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * @(#)disklabel.h 7.10 (Berkeley) 06/27/88 18 */ 19 20 /* 21 * Disk description table, see disktab(5) 22 */ 23 #define DISKTAB "/etc/disktab" 24 25 /* 26 * Each disk has a label which includes information about the hardware 27 * disk geometry, filesystem partitions, and drive specific information. 28 * The label is in block 0 or 1, possibly offset from the beginning 29 * to leave room for a bootstrap, etc. 30 */ 31 32 #define LABELSECTOR 0 /* sector containing label */ 33 #define LABELOFFSET 64 /* offset of label in sector */ 34 #define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */ 35 #ifndef MAXPARTITIONS 36 #define MAXPARTITIONS 8 37 #endif 38 39 40 #ifndef LOCORE 41 struct disklabel { 42 u_long d_magic; /* the magic number */ 43 short d_type; /* drive type */ 44 short d_subtype; /* controller/d_type specific */ 45 char d_typename[16]; /* type name, e.g. "eagle" */ 46 /* 47 * d_packname contains the pack identifier and is returned when 48 * the disklabel is read off the disk or in-core copy. 49 * d_boot0 and d_boot1 are the (optional) names of the 50 * primary (block 0) and secondary (block 1-15) bootstraps 51 * as found in /usr/mdec. These are returned when using 52 * getdiskbyname(3) to retrieve the values from /etc/disktab. 53 */ 54 #if defined(KERNEL) || defined(STANDALONE) 55 char d_packname[16]; /* pack identifier */ 56 #else 57 union { 58 char un_d_packname[16]; /* pack identifier */ 59 struct { 60 char *un_d_boot0; /* primary bootstrap name */ 61 char *un_d_boot1; /* secondary bootstrap name */ 62 } un_b; 63 } d_un; 64 #define d_packname d_un.un_d_packname 65 #define d_boot0 d_un.un_b.un_d_boot0 66 #define d_boot1 d_un.un_b.un_d_boot1 67 #endif /* ! KERNEL or STANDALONE */ 68 /* disk geometry: */ 69 u_long d_secsize; /* # of bytes per sector */ 70 u_long d_nsectors; /* # of data sectors per track */ 71 u_long d_ntracks; /* # of tracks per cylinder */ 72 u_long d_ncylinders; /* # of data cylinders per unit */ 73 u_long d_secpercyl; /* # of data sectors per cylinder */ 74 u_long d_secperunit; /* # of data sectors per unit */ 75 /* 76 * Spares (bad sector replacements) below 77 * are not counted in d_nsectors or d_secpercyl. 78 * Spare sectors are assumed to be physical sectors 79 * which occupy space at the end of each track and/or cylinder. 80 */ 81 u_short d_sparespertrack; /* # of spare sectors per track */ 82 u_short d_sparespercyl; /* # of spare sectors per cylinder */ 83 /* 84 * Alternate cylinders include maintenance, replacement, 85 * configuration description areas, etc. 86 */ 87 u_long d_acylinders; /* # of alt. cylinders per unit */ 88 89 /* hardware characteristics: */ 90 /* 91 * d_interleave, d_trackskew and d_cylskew describe perturbations 92 * in the media format used to compensate for a slow controller. 93 * Interleave is physical sector interleave, set up by the formatter 94 * or controller when formatting. When interleaving is in use, 95 * logically adjacent sectors are not physically contiguous, 96 * but instead are separated by some number of sectors. 97 * It is specified as the ratio of physical sectors traversed 98 * per logical sector. Thus an interleave of 1:1 implies contiguous 99 * layout, while 2:1 implies that logical sector 0 is separated 100 * by one sector from logical sector 1. 101 * d_trackskew is the offset of sector 0 on track N 102 * relative to sector 0 on track N-1 on the same cylinder. 103 * Finally, d_cylskew is the offset of sector 0 on cylinder N 104 * relative to sector 0 on cylinder N-1. 105 */ 106 u_short d_rpm; /* rotational speed */ 107 u_short d_interleave; /* hardware sector interleave */ 108 u_short d_trackskew; /* sector 0 skew, per track */ 109 u_short d_cylskew; /* sector 0 skew, per cylinder */ 110 u_long d_headswitch; /* head switch time, usec */ 111 u_long d_trkseek; /* track-to-track seek, usec */ 112 u_long d_flags; /* generic flags */ 113 #define NDDATA 5 114 u_long d_drivedata[NDDATA]; /* drive-type specific information */ 115 #define NSPARE 5 116 u_long d_spare[NSPARE]; /* reserved for future use */ 117 u_long d_magic2; /* the magic number (again) */ 118 u_short d_checksum; /* xor of data incl. partitions */ 119 120 /* filesystem and partition information: */ 121 u_short d_npartitions; /* number of partitions in following */ 122 u_long d_bbsize; /* size of boot area at sn0, bytes */ 123 u_long d_sbsize; /* max size of fs superblock, bytes */ 124 struct partition { /* the partition table */ 125 u_long p_size; /* number of sectors in partition */ 126 u_long p_offset; /* starting sector */ 127 u_long p_fsize; /* filesystem basic fragment size */ 128 u_char p_fstype; /* filesystem type, see below */ 129 u_char p_frag; /* filesystem fragments per block */ 130 u_short p_cpg; /* filesystem cylinders per group */ 131 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 132 }; 133 #else LOCORE 134 /* 135 * offsets for asm boot files. 136 */ 137 .set d_secsize,40 138 .set d_nsectors,44 139 .set d_ntracks,48 140 .set d_ncylinders,52 141 .set d_secpercyl,56 142 .set d_secperunit,60 143 .set d_end_,276 /* size of disk label */ 144 #endif LOCORE 145 146 /* d_type values: */ 147 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 148 #define DTYPE_MSCP 2 /* MSCP */ 149 #define DTYPE_DEC 3 /* other DEC (rk, rl) */ 150 #define DTYPE_SCSI 4 /* SCSI */ 151 #define DTYPE_ESDI 5 /* ESDI interface */ 152 #define DTYPE_ST506 6 /* ST506 etc. */ 153 #define DTYPE_FLOPPY 10 /* floppy */ 154 155 #ifdef DKTYPENAMES 156 static char *dktypenames[] = { 157 "unknown", 158 "SMD", 159 "MSCP", 160 "old DEC", 161 "SCSI", 162 "ESDI", 163 "type 6", 164 "type 7", 165 "type 8", 166 "type 9", 167 "floppy", 168 0 169 }; 170 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 171 #endif 172 173 /* 174 * Filesystem type and version. 175 * Used to interpret other filesystem-specific 176 * per-partition information. 177 */ 178 #define FS_UNUSED 0 /* unused */ 179 #define FS_SWAP 1 /* swap */ 180 #define FS_V6 2 /* Sixth Edition */ 181 #define FS_V7 3 /* Seventh Edition */ 182 #define FS_SYSV 4 /* System V */ 183 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 184 #define FS_V8 6 /* Eighth Edition, 4K blocks */ 185 #define FS_BSDFFS 7 /* 4.2BSD fast file system */ 186 187 #ifdef DKTYPENAMES 188 static char *fstypenames[] = { 189 "unused", 190 "swap", 191 "Version 6", 192 "Version 7", 193 "System V", 194 "4.1BSD", 195 "Eighth Edition", 196 "4.2BSD", 197 0 198 }; 199 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 200 #endif 201 202 /* 203 * flags shared by various drives: 204 */ 205 #define D_REMOVABLE 0x01 /* removable media */ 206 #define D_ECC 0x02 /* supports ECC */ 207 #define D_BADSECT 0x04 /* supports bad sector forw. */ 208 #define D_RAMDISK 0x08 /* disk emulator */ 209 #define D_CHAIN 0x10 /* can do back-back transfers */ 210 211 /* 212 * Drive data for SMD. 213 */ 214 #define d_smdflags d_drivedata[0] 215 #define D_SSE 0x1 /* supports skip sectoring */ 216 #define d_mindist d_drivedata[1] 217 #define d_maxdist d_drivedata[2] 218 #define d_sdist d_drivedata[3] 219 220 /* 221 * Drive data for ST506. 222 */ 223 #define d_precompcyl d_drivedata[0] 224 #define d_gap3 d_drivedata[1] /* used only when formatting */ 225 226 #ifndef LOCORE 227 /* 228 * Structure used to perform a format 229 * or other raw operation, returning data 230 * and/or register values. 231 * Register identification and format 232 * are device- and driver-dependent. 233 */ 234 struct format_op { 235 char *df_buf; 236 int df_count; /* value-result */ 237 daddr_t df_startblk; 238 int df_reg[8]; /* result */ 239 }; 240 241 /* 242 * Structure used internally to retrieve 243 * information about a partition on a disk. 244 */ 245 struct partinfo { 246 struct disklabel *disklab; 247 struct partition *part; 248 }; 249 250 /* 251 * Disk-specific ioctls. 252 */ 253 /* get and set disklabel; DIOCGPART used internally */ 254 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 255 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 256 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 257 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 258 259 /* do format operation, read or write */ 260 #define DIOCRFORMAT _IOWR('d', 105, struct format_op) 261 #define DIOCWFORMAT _IOWR('d', 106, struct format_op) 262 263 #define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 264 #define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 265 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */ 266 267 #define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */ 268 269 #endif LOCORE 270 271 #if !defined(KERNEL) && !defined(LOCORE) 272 struct disklabel *getdiskbyname(); 273 #endif 274