disklabel.h revision 115947
1/* 2 * Copyright (c) 1987, 1988, 1993 3 * The Regents of the University of California. 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 8.2 (Berkeley) 7/10/94 34 * $FreeBSD: head/sys/sys/disklabel.h 115947 2003-06-07 09:06:39Z phk $ 35 */ 36 37#ifndef _SYS_DISKLABEL_H_ 38#define _SYS_DISKLABEL_H_ 39 40#ifndef _KERNEL 41#include <sys/types.h> 42#endif 43#include <sys/ioccom.h> 44 45/* 46 * Disk description table, see disktab(5) 47 */ 48#define _PATH_DISKTAB "/etc/disktab" 49 50/* 51 * Each disk has a label which includes information about the hardware 52 * disk geometry, filesystem partitions, and drive specific information. 53 * The label is in block 0 or 1, possibly offset from the beginning 54 * to leave room for a bootstrap, etc. 55 */ 56 57/* XXX these should be defined per controller (or drive) elsewhere, not here! */ 58#if defined(__i386__) || defined(__amd64__) || defined(__ia64__) 59#define LABELSECTOR 1 /* sector containing label */ 60#define LABELOFFSET 0 /* offset of label in sector */ 61#endif 62 63#ifdef __alpha__ 64#define LABELSECTOR 0 65#define LABELOFFSET 64 66#endif 67 68#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */ 69#ifndef MAXPARTITIONS 70#define MAXPARTITIONS 8 71#endif 72 73/* Size of bootblock area in sector-size neutral bytes */ 74#define BBSIZE 8192 75 76#define LABEL_PART 2 /* partition containing label */ 77#define RAW_PART 2 /* partition containing whole disk */ 78#define SWAP_PART 1 /* partition normally containing swap */ 79 80struct disklabel { 81 u_int32_t d_magic; /* the magic number */ 82 u_int16_t d_type; /* drive type */ 83 u_int16_t d_subtype; /* controller/d_type specific */ 84 char d_typename[16]; /* type name, e.g. "eagle" */ 85 86 char d_packname[16]; /* pack identifier */ 87 88 /* disk geometry: */ 89 u_int32_t d_secsize; /* # of bytes per sector */ 90 u_int32_t d_nsectors; /* # of data sectors per track */ 91 u_int32_t d_ntracks; /* # of tracks per cylinder */ 92 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 93 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 94 u_int32_t d_secperunit; /* # of data sectors per unit */ 95 96 /* 97 * Spares (bad sector replacements) below are not counted in 98 * d_nsectors or d_secpercyl. Spare sectors are assumed to 99 * be physical sectors which occupy space at the end of each 100 * track and/or cylinder. 101 */ 102 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 103 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 104 /* 105 * Alternate cylinders include maintenance, replacement, configuration 106 * description areas, etc. 107 */ 108 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 109 110 /* hardware characteristics: */ 111 /* 112 * d_interleave, d_trackskew and d_cylskew describe perturbations 113 * in the media format used to compensate for a slow controller. 114 * Interleave is physical sector interleave, set up by the 115 * formatter or controller when formatting. When interleaving is 116 * in use, logically adjacent sectors are not physically 117 * contiguous, but instead are separated by some number of 118 * sectors. It is specified as the ratio of physical sectors 119 * traversed per logical sector. Thus an interleave of 1:1 120 * implies contiguous layout, while 2:1 implies that logical 121 * sector 0 is separated by one sector from logical sector 1. 122 * d_trackskew is the offset of sector 0 on track N relative to 123 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 124 * is the offset of sector 0 on cylinder N relative to sector 0 125 * on cylinder N-1. 126 */ 127 u_int16_t d_rpm; /* rotational speed */ 128 u_int16_t d_interleave; /* hardware sector interleave */ 129 u_int16_t d_trackskew; /* sector 0 skew, per track */ 130 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 131 u_int32_t d_headswitch; /* head switch time, usec */ 132 u_int32_t d_trkseek; /* track-to-track seek, usec */ 133 u_int32_t d_flags; /* generic flags */ 134#define NDDATA 5 135 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */ 136#define NSPARE 5 137 u_int32_t d_spare[NSPARE]; /* reserved for future use */ 138 u_int32_t d_magic2; /* the magic number (again) */ 139 u_int16_t d_checksum; /* xor of data incl. partitions */ 140 141 /* filesystem and partition information: */ 142 u_int16_t d_npartitions; /* number of partitions in following */ 143 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 144 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 145 struct partition { /* the partition table */ 146 u_int32_t p_size; /* number of sectors in partition */ 147 u_int32_t p_offset; /* starting sector */ 148 u_int32_t p_fsize; /* filesystem basic fragment size */ 149 u_int8_t p_fstype; /* filesystem type, see below */ 150 u_int8_t p_frag; /* filesystem fragments per block */ 151 u_int16_t p_cpg; /* filesystem cylinders per group */ 152 } d_partitions[MAXPARTITIONS]; /* actually may be more */ 153}; 154 155#ifdef CTASSERT 156CTASSERT(sizeof(struct disklabel) == 148 + MAXPARTITIONS * 16); 157#endif 158 159static __inline u_int16_t dkcksum(struct disklabel *lp); 160static __inline u_int16_t 161dkcksum(struct disklabel *lp) 162{ 163 u_int16_t *start, *end; 164 u_int16_t sum = 0; 165 166 start = (u_int16_t *)lp; 167 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 168 while (start < end) 169 sum ^= *start++; 170 return (sum); 171} 172 173 174/* d_type values: */ 175#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */ 176#define DTYPE_MSCP 2 /* MSCP */ 177#define DTYPE_DEC 3 /* other DEC (rk, rl) */ 178#define DTYPE_SCSI 4 /* SCSI */ 179#define DTYPE_ESDI 5 /* ESDI interface */ 180#define DTYPE_ST506 6 /* ST506 etc. */ 181#define DTYPE_HPIB 7 /* CS/80 on HP-IB */ 182#define DTYPE_HPFL 8 /* HP Fiber-link */ 183#define DTYPE_FLOPPY 10 /* floppy */ 184#define DTYPE_CCD 11 /* concatenated disk */ 185#define DTYPE_VINUM 12 /* vinum volume */ 186#define DTYPE_DOC2K 13 /* Msys DiskOnChip */ 187#define DTYPE_RAID 14 /* CMU RAIDFrame */ 188#define DTYPE_JFS2 16 /* IBM JFS 2 */ 189 190#ifdef DKTYPENAMES 191static const char *dktypenames[] = { 192 "unknown", 193 "SMD", 194 "MSCP", 195 "old DEC", 196 "SCSI", 197 "ESDI", 198 "ST506", 199 "HP-IB", 200 "HP-FL", 201 "type 9", 202 "floppy", 203 "CCD", 204 "Vinum", 205 "DOC2K", 206 "Raid", 207 "?", 208 "jfs", 209 NULL 210}; 211#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1) 212#endif 213 214/* 215 * Filesystem type and version. 216 * Used to interpret other filesystem-specific 217 * per-partition information. 218 */ 219#define FS_UNUSED 0 /* unused */ 220#define FS_SWAP 1 /* swap */ 221#define FS_V6 2 /* Sixth Edition */ 222#define FS_V7 3 /* Seventh Edition */ 223#define FS_SYSV 4 /* System V */ 224#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */ 225#define FS_V8 6 /* Eighth Edition, 4K blocks */ 226#define FS_BSDFFS 7 /* 4.2BSD fast filesystem */ 227#define FS_MSDOS 8 /* MSDOS filesystem */ 228#define FS_BSDLFS 9 /* 4.4BSD log-structured filesystem */ 229#define FS_OTHER 10 /* in use, but unknown/unsupported */ 230#define FS_HPFS 11 /* OS/2 high-performance filesystem */ 231#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */ 232#define FS_BOOT 13 /* partition contains bootstrap */ 233#define FS_VINUM 14 /* Vinum drive */ 234#define FS_RAID 15 /* RAIDFrame drive */ 235#define FS_JFS2 21 /* IBM JFS2 */ 236 237#ifdef FSTYPENAMES 238static const char *fstypenames[] = { 239 "unused", 240 "swap", 241 "Version 6", 242 "Version 7", 243 "System V", 244 "4.1BSD", 245 "Eighth Edition", 246 "4.2BSD", 247 "MSDOS", 248 "4.4LFS", 249 "unknown", 250 "HPFS", 251 "ISO9660", 252 "boot", 253 "vinum", 254 "raid", 255 "?", 256 "?", 257 "?", 258 "?", 259 "jfs", 260 NULL 261}; 262#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) 263#endif 264 265/* 266 * flags shared by various drives: 267 */ 268#define D_REMOVABLE 0x01 /* removable media */ 269#define D_ECC 0x02 /* supports ECC */ 270#define D_BADSECT 0x04 /* supports bad sector forw. */ 271#define D_RAMDISK 0x08 /* disk emulator */ 272#define D_CHAIN 0x10 /* can do back-back transfers */ 273 274/* 275 * Disklabel-specific ioctls. 276 * 277 * NB: <sys/disk.h> defines ioctls from 'd'/128 and up. 278 */ 279 /* get and set disklabel */ 280#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */ 281#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */ 282#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */ 283#define DIOCBSDBB _IOW('d', 110, void *) /* write bootblocks */ 284 285/* 286 * Functions for proper encoding/decoding of struct disklabel into/from 287 * bytestring. 288 */ 289void bsd_partition_le_dec(u_char *ptr, struct partition *d); 290int bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart); 291void bsd_partition_le_enc(u_char *ptr, struct partition *d); 292void bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d); 293 294#ifndef _KERNEL 295__BEGIN_DECLS 296struct disklabel *getdiskbyname(const char *); 297__END_DECLS 298#endif 299 300#endif /* !_SYS_DISKLABEL_H_ */ 301