sys/sys/disklabel32.h

   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: src/sys/sys/disklabel.h,v 1.49.2.7 2001/05/27 05:58:26 jkh Exp $
  35  * $DragonFly: src/sys/sys/disklabel32.h,v 1.12 2006/02/17 19:18:07 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_DISKLABEL_H_
  39 #define _SYS_DISKLABEL_H_
  40
  41 #ifndef _KERNEL
  42 #include <sys/types.h>
  43 #endif
  44 #include <sys/ioccom.h>
  45 #include <sys/conf.h>
  46
  47 /*
  48  * Disk description table, see disktab(5)
  49  */
  50 #define _PATH_DISKTAB   "/etc/disktab"
  51 #define DISKTAB         "/etc/disktab"          /* deprecated */
  52
  53 /*
  54  * Each disk has a label which includes information about the hardware
  55  * disk geometry, filesystem partitions, and drive specific information.
  56  * The label is in block 0 or 1, possibly offset from the beginning
  57  * to leave room for a bootstrap, etc.
  58  */
  59
  60 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
  61 #ifdef __i386__
  62 #define LABELSECTOR     1                       /* sector containing label */
  63 #define LABELOFFSET     0                       /* offset of label in sector */
  64 #endif
  65
  66 #ifndef LABELSECTOR
  67 #define LABELSECTOR     0                       /* sector containing label */
  68 #endif
  69
  70 #ifndef LABELOFFSET
  71 #define LABELOFFSET     64                      /* offset of label in sector */
  72 #endif
  73
  74 #define DISKMAGIC       ((u_int32_t)0x82564557) /* The disk magic number */
  75 #ifndef MAXPARTITIONS
  76 #define MAXPARTITIONS   16
  77 #endif
  78
  79 #define LABEL_PART      2               /* partition containing label */
  80 #define RAW_PART        2               /* partition containing whole disk */
  81 #define SWAP_PART       1               /* partition normally containing swap */
  82
  83 #ifndef LOCORE
  84 struct disklabel {
  85         u_int32_t d_magic;              /* the magic number */
  86         u_int16_t d_type;               /* drive type */
  87         u_int16_t d_subtype;            /* controller/d_type specific */
  88         char      d_typename[16];       /* type name, e.g. "eagle" */
  89
  90         /*
  91          * d_packname contains the pack identifier and is returned when
  92          * the disklabel is read off the disk or in-core copy.
  93          * d_boot0 and d_boot1 are the (optional) names of the
  94          * primary (block 0) and secondary (block 1-15) bootstraps
  95          * as found in /boot.  These are returned when using
  96          * getdiskbyname(3) to retrieve the values from /etc/disktab.
  97          */
  98         union {
  99                 char    un_d_packname[16];      /* pack identifier */
 100                 struct {
 101                         char *un_d_boot0;       /* primary bootstrap name */
 102                         char *un_d_boot1;       /* secondary bootstrap name */
 103                 } un_b;
 104         } d_un;
 105 #define d_packname      d_un.un_d_packname
 106 #define d_boot0         d_un.un_b.un_d_boot0
 107 #define d_boot1         d_un.un_b.un_d_boot1
 108
 109                         /* disk geometry: */
 110         u_int32_t d_secsize;            /* # of bytes per sector */
 111         u_int32_t d_nsectors;           /* # of data sectors per track */
 112         u_int32_t d_ntracks;            /* # of tracks per cylinder */
 113         u_int32_t d_ncylinders;         /* # of data cylinders per unit */
 114         u_int32_t d_secpercyl;          /* # of data sectors per cylinder */
 115         u_int32_t d_secperunit;         /* # of data sectors per unit */
 116
 117         /*
 118          * Spares (bad sector replacements) below are not counted in
 119          * d_nsectors or d_secpercyl.  Spare sectors are assumed to
 120          * be physical sectors which occupy space at the end of each
 121          * track and/or cylinder.
 122          */
 123         u_int16_t d_sparespertrack;     /* # of spare sectors per track */
 124         u_int16_t d_sparespercyl;       /* # of spare sectors per cylinder */
 125         /*
 126          * Alternate cylinders include maintenance, replacement, configuration
 127          * description areas, etc.
 128          */
 129         u_int32_t d_acylinders;         /* # of alt. cylinders per unit */
 130
 131                         /* hardware characteristics: */
 132         /*
 133          * d_interleave, d_trackskew and d_cylskew describe perturbations
 134          * in the media format used to compensate for a slow controller.
 135          * Interleave is physical sector interleave, set up by the
 136          * formatter or controller when formatting.  When interleaving is
 137          * in use, logically adjacent sectors are not physically
 138          * contiguous, but instead are separated by some number of
 139          * sectors.  It is specified as the ratio of physical sectors
 140          * traversed per logical sector.  Thus an interleave of 1:1
 141          * implies contiguous layout, while 2:1 implies that logical
 142          * sector 0 is separated by one sector from logical sector 1.
 143          * d_trackskew is the offset of sector 0 on track N relative to
 144          * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
 145          * is the offset of sector 0 on cylinder N relative to sector 0
 146          * on cylinder N-1.
 147          */
 148         u_int16_t d_rpm;                /* rotational speed */
 149         u_int16_t d_interleave;         /* hardware sector interleave */
 150         u_int16_t d_trackskew;          /* sector 0 skew, per track */
 151         u_int16_t d_cylskew;            /* sector 0 skew, per cylinder */
 152         u_int32_t d_headswitch;         /* head switch time, usec */
 153         u_int32_t d_trkseek;            /* track-to-track seek, usec */
 154         u_int32_t d_flags;              /* generic flags */
 155 #define NDDATA 5
 156         u_int32_t d_drivedata[NDDATA];  /* drive-type specific information */
 157 #define NSPARE 5
 158         u_int32_t d_spare[NSPARE];      /* reserved for future use */
 159         u_int32_t d_magic2;             /* the magic number (again) */
 160         u_int16_t d_checksum;           /* xor of data incl. partitions */
 161
 162                         /* filesystem and partition information: */
 163         u_int16_t d_npartitions;        /* number of partitions in following */
 164         u_int32_t d_bbsize;             /* size of boot area at sn0, bytes */
 165         u_int32_t d_sbsize;             /* max size of fs superblock, bytes */
 166         struct  partition {             /* the partition table */
 167                 u_int32_t p_size;       /* number of sectors in partition */
 168                 u_int32_t p_offset;     /* starting sector */
 169                 u_int32_t p_fsize;      /* filesystem basic fragment size */
 170                 u_int8_t p_fstype;      /* filesystem type, see below */
 171                 u_int8_t p_frag;        /* filesystem fragments per block */
 172                 union {
 173                         u_int16_t cpg;  /* UFS: FS cylinders per group */
 174                         u_int16_t sgs;  /* LFS: FS segment shift */
 175                 } __partition_u1;
 176 #define p_cpg   __partition_u1.cpg
 177 #define p_sgs   __partition_u1.sgs
 178         } d_partitions[MAXPARTITIONS];  /* actually may be more */
 179 };
 180
 181 static u_int16_t dkcksum(struct disklabel *lp);
 182
 183 static __inline u_int16_t
 184 dkcksum(struct disklabel *lp)
 185 {
 186         u_int16_t *start, *end;
 187         u_int16_t sum = 0;
 188
 189         start = (u_int16_t *)lp;
 190         end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
 191         while (start < end)
 192                 sum ^= *start++;
 193         return (sum);
 194 }
 195
 196 #else /* LOCORE */
 197         /*
 198          * offsets for asm boot files.
 199          */
 200         .set    d_secsize,40
 201         .set    d_nsectors,44
 202         .set    d_ntracks,48
 203         .set    d_ncylinders,52
 204         .set    d_secpercyl,56
 205         .set    d_secperunit,60
 206         .set    d_end_,276              /* size of disk label */
 207 #endif /* LOCORE */
 208
 209 /* d_type values: */
 210 #define DTYPE_SMD               1               /* SMD, XSMD; VAX hp/up */
 211 #define DTYPE_MSCP              2               /* MSCP */
 212 #define DTYPE_DEC               3               /* other DEC (rk, rl) */
 213 #define DTYPE_SCSI              4               /* SCSI */
 214 #define DTYPE_ESDI              5               /* ESDI interface */
 215 #define DTYPE_ST506             6               /* ST506 etc. */
 216 #define DTYPE_HPIB              7               /* CS/80 on HP-IB */
 217 #define DTYPE_HPFL              8               /* HP Fiber-link */
 218 #define DTYPE_FLOPPY            10              /* floppy */
 219 #define DTYPE_CCD               11              /* concatenated disk */
 220 #define DTYPE_VINUM             12              /* vinum volume */
 221 #define DTYPE_DOC2K             13              /* Msys DiskOnChip */
 222
 223 #ifdef DKTYPENAMES
 224 static const char *dktypenames[] = {
 225         "unknown",
 226         "SMD",
 227         "MSCP",
 228         "old DEC",
 229         "SCSI",
 230         "ESDI",
 231         "ST506",
 232         "HP-IB",
 233         "HP-FL",
 234         "type 9",
 235         "floppy",
 236         "CCD",
 237         "Vinum",
 238         "DOC2K",
 239         NULL
 240 };
 241 #define DKMAXTYPES      (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
 242 #endif
 243
 244 /*
 245  * Filesystem type and version.
 246  * Used to interpret other filesystem-specific
 247  * per-partition information.
 248  */
 249 #define FS_UNUSED       0               /* unused */
 250 #define FS_SWAP         1               /* swap */
 251 #define FS_V6           2               /* Sixth Edition */
 252 #define FS_V7           3               /* Seventh Edition */
 253 #define FS_SYSV         4               /* System V */
 254 #define FS_V71K         5               /* V7 with 1K blocks (4.1, 2.9) */
 255 #define FS_V8           6               /* Eighth Edition, 4K blocks */
 256 #define FS_BSDFFS       7               /* 4.2BSD fast file system */
 257 #define FS_MSDOS        8               /* MSDOS file system */
 258 #define FS_BSDLFS       9               /* 4.4BSD log-structured file system */
 259 #define FS_OTHER        10              /* in use, but unknown/unsupported */
 260 #define FS_HPFS         11              /* OS/2 high-performance file system */
 261 #define FS_ISO9660      12              /* ISO 9660, normally CD-ROM */
 262 #define FS_BOOT         13              /* partition contains bootstrap */
 263 #define FS_VINUM        14              /* Vinum drive */
 264
 265 #ifdef  DKTYPENAMES
 266 static const char *fstypenames[] = {
 267         "unused",
 268         "swap",
 269         "Version 6",
 270         "Version 7",
 271         "System V",
 272         "4.1BSD",
 273         "Eighth Edition",
 274         "4.2BSD",
 275         "MSDOS",
 276         "4.4LFS",
 277         "unknown",
 278         "HPFS",
 279         "ISO9660",
 280         "boot",
 281         "vinum",
 282         NULL
 283 };
 284 #define FSMAXTYPES      (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
 285 #endif
 286
 287 /*
 288  * flags shared by various drives:
 289  */
 290 #define         D_REMOVABLE     0x01            /* removable media */
 291 #define         D_ECC           0x02            /* supports ECC */
 292 #define         D_BADSECT       0x04            /* supports bad sector forw. */
 293 #define         D_RAMDISK       0x08            /* disk emulator */
 294 #define         D_CHAIN         0x10            /* can do back-back transfers */
 295
 296 /*
 297  * Drive data for SMD.
 298  */
 299 #define d_smdflags      d_drivedata[0]
 300 #define         D_SSE           0x1             /* supports skip sectoring */
 301 #define d_mindist       d_drivedata[1]
 302 #define d_maxdist       d_drivedata[2]
 303 #define d_sdist         d_drivedata[3]
 304
 305 /*
 306  * Drive data for ST506.
 307  */
 308 #define d_precompcyl    d_drivedata[0]
 309 #define d_gap3          d_drivedata[1]          /* used only when formatting */
 310
 311 /*
 312  * Drive data for SCSI.
 313  */
 314 #define d_blind         d_drivedata[0]
 315
 316 #ifndef LOCORE
 317 /*
 318  * Structure used to perform a format or other raw operation, returning
 319  * data and/or register values.  Register identification and format
 320  * are device- and driver-dependent.
 321  */
 322 struct format_op {
 323         char    *df_buf;
 324         int      df_count;              /* value-result */
 325         daddr_t  df_startblk;
 326         int      df_reg[8];             /* result */
 327 };
 328
 329 /*
 330  * Structure used internally to retrieve information about a partition
 331  * on a disk.
 332  */
 333 struct partinfo {
 334         struct disklabel *disklab;
 335         struct partition *part;
 336 };
 337
 338 /*
 339  * Disk-specific ioctls.
 340  */
 341                 /* get and set disklabel; DIOCGPART used internally */
 342 #define DIOCGDINFO      _IOR('d', 101, struct disklabel)/* get */
 343 #define DIOCSDINFO      _IOW('d', 102, struct disklabel)/* set */
 344 #define DIOCWDINFO      _IOW('d', 103, struct disklabel)/* set, update disk */
 345 #define DIOCGPART       _IOW('d', 104, struct partinfo) /* get partition */
 346 #define DIOCGDVIRGIN    _IOR('d', 105, struct disklabel) /* get virgin label */
 347
 348 #define DIOCWLABEL      _IOW('d', 109, int)     /* write en/disable label */
 349
 350 #ifdef _KERNEL
 351
 352 /*
 353  * XXX encoding of disk minor numbers, should be elsewhere.
 354  *
 355  * See <sys/reboot.h> for a possibly better encoding.
 356  *
 357  * "cpio -H newc" can be used to back up device files with large minor
 358  * numbers (but not ones >= 2^31).  Old cpio formats and all tar formats
 359  * don't have enough bits, and cpio and tar don't notice the lossage.
 360  * There are also some sign extension bugs.
 361  */
 362
 363 /*
 364        3                   2                   1                   0
 365      1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 366     _________________________________________________________________
 367     | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
 368     -----------------------------------------------------------------
 369     |    TYPE     |UNIT_2 |P| SLICE |  MAJOR?       |  UNIT   |PART |
 370     -----------------------------------------------------------------
 371 */
 372
 373 #define DKMAXUNIT 0x1ff         /* Highest disk unit number */
 374
 375 #define dkmakeminor(unit, slice, part) \
 376                                 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
 377                                 (((unit) & 0x1f) << 3) | (part & 7) | \
 378                                 ((part & 0x08) << 17))
 379
 380 static __inline u_int
 381 dkunitmask(void)
 382 {
 383         return (0x01e000f8);
 384 }
 385
 386 static __inline u_int
 387 dkmakeunit(int unit)
 388 {
 389         return(dkmakeminor(unit, 0, 0));
 390 }
 391
 392 static __inline dev_t
 393 dkmodpart(dev_t dev, int part)
 394 {
 395         int val;
 396
 397         if (part < 8)
 398                 val = (part & 7);
 399         else
 400                 val = (part & 7) | 0x100000;
 401         return (make_sub_dev(dev, (minor(dev) & ~0x100007) | val));
 402 }
 403
 404 static __inline dev_t
 405 dkmodslice(dev_t dev, int slice)
 406 {
 407         return (make_sub_dev(dev, (minor(dev) & ~0x0f0000) | (slice << 16)));
 408 }
 409
 410 static __inline int
 411 dkpart(dev_t dev)
 412 {
 413         return (((minor(dev) >> 17) & 0x08) | (minor(dev) & 7));
 414 }
 415
 416 #define dkslice(dev)            ((minor(dev) >> 16) & 0x0f)
 417 #define dktype(dev)             ((minor(dev) >> 25) & 0x7f)
 418
 419 static __inline u_int
 420 dkunit(dev_t dev)
 421 {
 422         return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f));
 423 }
 424
 425 struct  buf;
 426 struct  bio;
 427 struct  bio_queue_head;
 428
 429 struct bio *bounds_check_with_label (dev_t dev, struct bio *bio,
 430                                      struct disklabel *lp, int wlabel);
 431 void    diskerr (struct bio *bio, dev_t dev, const char *what, int pri,
 432                      int blkdone, struct disklabel *lp);
 433 void    disksort (struct buf *ap, struct buf *bp);
 434 char    *readdisklabel (dev_t dev, struct disklabel *lp);
 435 void    bioqdisksort (struct bio_queue_head *ap, struct bio *bio);
 436 int     setdisklabel (struct disklabel *olp, struct disklabel *nlp,
 437                           u_long openmask);
 438 int     writedisklabel (dev_t dev, struct disklabel *lp);
 439
 440 #endif /* _KERNEL */
 441
 442 #endif /* LOCORE */
 443
 444 #ifndef _KERNEL
 445 __BEGIN_DECLS
 446 struct disklabel *getdiskbyname (const char *);
 447 __END_DECLS
 448 #endif
 449
 450 #endif /* !_SYS_DISKLABEL_H_ */