1 /* 2 * Copyright (c) 1987 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 this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific prior written permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 * 12 * @(#)disklabel.h 7.7 (Berkeley) 12/18/87 13 */ 14 15 /* 16 * Disk description table, see disktab(5) 17 */ 18 #define DISKTAB "/etc/disktab" 19 20 /* 21 * Each disk has a label which includes information about the hardware 22 * disk geometry, filesystem partitions, and drive specific information. 23 * The label is in block 0 or 1, possibly offset from the beginning 24 * to leave room for a bootstrap, etc. 25 */ 26 27 #define LABELSECTOR 0 /* sector containing label */ 28 #define LABELOFFSET 64 /* offset of label in sector */ 29 #define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */ 30 #ifndef MAXPARTITIONS 31 #define MAXPARTITIONS 8 32 #endif 33 34 35 #ifndef LOCORE 36 struct disklabel { 37 u_long d_magic; /* the magic number */ 38 short d_type; /* drive type */ 39 short d_subtype; /* controller/d_type specific */ 40 char d_typename[16]; /* type name, e.g. "eagle" */ 41 char d_name[16]; /* pack identifier */ 42 43 /* disk geometry: */ 44 u_long d_secsize; /* # of bytes per sector */ 45 u_long d_nsectors; /* # of data sectors per track */ 46 u_long d_ntracks; /* # of tracks per cylinder */ 47 u_long d_ncylinders; /* # of data cylinders per unit */ 48 u_long d_secpercyl; /* # of data sectors per cylinder */ 49 u_long d_secperunit; /* # of data sectors per unit */ 50 /* 51 * Spares (bad sector replacements) below 52 * are not counted in d_nsectors or d_secpercyl. 53 * Spare sectors are assumed to be physical sectors 54 * which occupy space at the end of each track and/or cylinder. 55 */ 56 u_short d_sparespertrack; /* # of spare sectors per track */ 57 u_short d_sparespercyl; /* # of spare sectors per cylinder */ 58 /* 59 * Alternate cylinders include maintenance, replacement, 60 * configuration description areas, etc. 61 */ 62 u_long d_acylinders; /* # of alt. cylinders per unit */ 63 64 /* hardware characteristics: */ 65 /* 66 * d_interleave, d_trackskew and d_cylskew describe perturbations 67 * in the media format used to compensate for a slow controller. 68 * Interleave is physical sector interleave, set up by the formatter 69 * or controller when formatting. When interleaving is in use, 70 * logically adjacent sectors are not physically contiguous, 71 * but instead are separated by some number of sectors. 72 * It is specified as the ratio of physical sectors traversed 73 * per logical sector. Thus an interleave of 1:1 implies contiguous 74 * layout, while 2:1 implies that logical sector 0 is separated 75 * by one sector from logical sector 1. 76 * d_trackskew is the offset of sector 0 on track N 77 * relative to sector 0 on track N-1 on the same cylinder. 78 * Finally, d_cylskew is the offset of sector 0 on cylinder N 79 * relative to sector 0 on cylinder N-1. 80 */ 81 u_short d_rpm; /* rotational speed */ 82 u_short d_interleave; /* hardware sector interleave */ 83 u_short d_trackskew; /* sector 0 skew, per track */ 84 u_short d_cylskew; /* sector 0 skew, per cylinder */ 85 u_long d_headswitch; /* head switch time, usec */ 86 u_long d_trkseek; /* track-to-track seek, usec */ 87 u_long d_flags; /* generic flags */ 88 #define NDDATA 5 89 u_long d_drivedata[NDDATA]; /* drive-type specific information */ 90 #define NSPARE 5 91 u_long d_spare[NSPARE]; /* reserved for future use */ 92 u_long d_magic2; /* the magic number (again) */ 93 u_short d_checksum; /* xor of data incl. partitions */ 94 95 /* filesystem and partition information: */ 96 u_short d_npartitions; /* number of partitions in following */ 97 u_long d_bbsize; /* size of boot area at sn0, bytes */ 98 u_long d_sbsize; /* max size of fs superblock, bytes */ 99 struct partition { /* the partition table */ 100 u_long p_size; /* number of sectors in partition */ 101 u_long p_offset; /* starting sector */ 102 u_long p_fsize; /* filesystem basic fragment size */ 103 u_char p_fstype; /* filesystem type, see below */ 104 u_char p_frag; /* filesystem fragments per block */ 105 u_short p_cpg; /* filesystem cylinders per group */ 106 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 107 }; 108 #else LOCORE 109 /* 110 * offsets for asm boot files. 111 */ 112 .set d_secsize,40 113 .set d_nsectors,44 114 .set d_ntracks,48 115 .set d_ncylinders,52 116 .set d_secpercyl,56 117 .set d_secperunit,60 118 .set d_end_,276 /* size of disk label */ 119 #endif LOCORE 120 121 /* d_type values: */ 122 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 123 #define DTYPE_MSCP 2 /* MSCP */ 124 #define DTYPE_DEC 3 /* other DEC (rk, rl) */ 125 #define DTYPE_SCSI 4 /* SCSI */ 126 #define DTYPE_ESDI 5 /* ESDI interface */ 127 #define DTYPE_ST506 6 /* ST506 etc. */ 128 #define DTYPE_FLOPPY 10 /* floppy */ 129 130 #ifdef DKTYPENAMES 131 static char *dktypenames[] = { 132 "unknown", 133 "SMD", 134 "MSCP", 135 "old DEC", 136 "SCSI", 137 "ESDI", 138 "type 6", 139 "type 7", 140 "type 8", 141 "type 9", 142 "floppy", 143 0 144 }; 145 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 146 #endif 147 148 /* 149 * Filesystem type and version. 150 * Used to interpret other filesystem-specific 151 * per-partition information. 152 */ 153 #define FS_UNUSED 0 /* unused */ 154 #define FS_SWAP 1 /* swap */ 155 #define FS_V6 2 /* Sixth Edition */ 156 #define FS_V7 3 /* Seventh Edition */ 157 #define FS_SYSV 4 /* System V */ 158 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 159 #define FS_V8 6 /* Eighth Edition, 4K blocks */ 160 #define FS_BSDFFS 7 /* 4.2BSD fast file system */ 161 162 #ifdef DKTYPENAMES 163 static char *fstypenames[] = { 164 "unused", 165 "swap", 166 "Version 6", 167 "Version 7", 168 "System V", 169 "4.1BSD", 170 "Eighth Edition", 171 "4.2BSD", 172 0 173 }; 174 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 175 #endif 176 177 /* 178 * flags shared by various drives: 179 */ 180 #define D_REMOVABLE 0x01 /* removable media */ 181 #define D_ECC 0x02 /* supports ECC */ 182 #define D_BADSECT 0x04 /* supports bad sector forw. */ 183 #define D_RAMDISK 0x08 /* disk emulator */ 184 #define D_CHAIN 0x10 /* can do back-back transfers */ 185 186 /* 187 * Drive data for SMD. 188 */ 189 #define d_smdflags d_drivedata[0] 190 #define D_SSE 0x1 /* supports skip sectoring */ 191 #define d_mindist d_drivedata[1] 192 #define d_maxdist d_drivedata[2] 193 #define d_sdist d_drivedata[3] 194 195 /* 196 * Drive data for ST506. 197 */ 198 #define d_precompcyl d_drivedata[0] 199 #define d_gap3 d_drivedata[1] /* used only when formatting */ 200 201 #ifndef LOCORE 202 /* 203 * Structure used to perform a format 204 * or other raw operation, returning data 205 * and/or register values. 206 * Register identification and format 207 * are device- and driver-dependent. 208 */ 209 struct format_op { 210 char *df_buf; 211 int df_count; /* value-result */ 212 daddr_t df_startblk; 213 int df_reg[8]; /* result */ 214 }; 215 216 /* 217 * Structure used internally to retrieve 218 * information about a partition on a disk. 219 */ 220 struct partinfo { 221 struct disklabel *disklab; 222 struct partition *part; 223 }; 224 225 /* 226 * Disk-specific ioctls. 227 */ 228 /* get and set disklabel; last form used internally */ 229 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 230 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 231 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set and write back */ 232 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */ 233 234 /* do format operation, read or write */ 235 #define DIOCRFORMAT _IOWR('d', 105, struct format_op) 236 #define DIOCWFORMAT _IOWR('d', 106, struct format_op) 237 238 #define DIOCSSTEP _IOW('d', 107, int) /* set step rate */ 239 #define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */ 240 241 #endif LOCORE 242 243 #if !defined(KERNEL) && !defined(LOCORE) 244 struct disklabel *getdiskbyname(); 245 #endif 246