The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/sys/disklabel.h

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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  * $FreeBSD$
   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 #define DISKTAB         "/etc/disktab"          /* deprecated */
   50 
   51 /*
   52  * Each disk has a label which includes information about the hardware
   53  * disk geometry, filesystem partitions, and drive specific information.
   54  * The label is in block 0 or 1, possibly offset from the beginning
   55  * to leave room for a bootstrap, etc.
   56  */
   57 
   58 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
   59 #ifdef __i386__
   60 #define LABELSECTOR     1                       /* sector containing label */
   61 #define LABELOFFSET     0                       /* offset of label in sector */
   62 #endif
   63 
   64 #ifdef __alpha__
   65 #define LABELSECTOR     0
   66 #define LABELOFFSET     64
   67 #endif
   68 
   69 #ifndef LABELSECTOR
   70 #define LABELSECTOR     0                       /* sector containing label */
   71 #endif
   72 
   73 #ifndef LABELOFFSET
   74 #define LABELOFFSET     64                      /* offset of label in sector */
   75 #endif
   76 
   77 #define DISKMAGIC       ((u_int32_t)0x82564557) /* The disk magic number */
   78 #ifndef MAXPARTITIONS
   79 #define MAXPARTITIONS   8
   80 #endif
   81 
   82 #define LABEL_PART      2               /* partition containing label */
   83 #define RAW_PART        2               /* partition containing whole disk */
   84 #define SWAP_PART       1               /* partition normally containing swap */
   85 
   86 #ifndef LOCORE
   87 struct disklabel {
   88         u_int32_t d_magic;              /* the magic number */
   89         u_int16_t d_type;               /* drive type */
   90         u_int16_t d_subtype;            /* controller/d_type specific */
   91         char      d_typename[16];       /* type name, e.g. "eagle" */
   92 
   93         /* 
   94          * d_packname contains the pack identifier and is returned when
   95          * the disklabel is read off the disk or in-core copy.
   96          * d_boot0 and d_boot1 are the (optional) names of the
   97          * primary (block 0) and secondary (block 1-15) bootstraps
   98          * as found in /boot.  These are returned when using
   99          * getdiskbyname(3) to retrieve the values from /etc/disktab.
  100          */
  101         union {
  102                 char    un_d_packname[16];      /* pack identifier */
  103                 struct {
  104                         char *un_d_boot0;       /* primary bootstrap name */
  105                         char *un_d_boot1;       /* secondary bootstrap name */
  106                 } un_b;
  107         } d_un;
  108 #define d_packname      d_un.un_d_packname
  109 #define d_boot0         d_un.un_b.un_d_boot0
  110 #define d_boot1         d_un.un_b.un_d_boot1
  111 
  112                         /* disk geometry: */
  113         u_int32_t d_secsize;            /* # of bytes per sector */
  114         u_int32_t d_nsectors;           /* # of data sectors per track */
  115         u_int32_t d_ntracks;            /* # of tracks per cylinder */
  116         u_int32_t d_ncylinders;         /* # of data cylinders per unit */
  117         u_int32_t d_secpercyl;          /* # of data sectors per cylinder */
  118         u_int32_t d_secperunit;         /* # of data sectors per unit */
  119 
  120         /*
  121          * Spares (bad sector replacements) below are not counted in
  122          * d_nsectors or d_secpercyl.  Spare sectors are assumed to
  123          * be physical sectors which occupy space at the end of each
  124          * track and/or cylinder.
  125          */
  126         u_int16_t d_sparespertrack;     /* # of spare sectors per track */
  127         u_int16_t d_sparespercyl;       /* # of spare sectors per cylinder */
  128         /*
  129          * Alternate cylinders include maintenance, replacement, configuration
  130          * description areas, etc.
  131          */
  132         u_int32_t d_acylinders;         /* # of alt. cylinders per unit */
  133 
  134                         /* hardware characteristics: */
  135         /*
  136          * d_interleave, d_trackskew and d_cylskew describe perturbations
  137          * in the media format used to compensate for a slow controller.
  138          * Interleave is physical sector interleave, set up by the
  139          * formatter or controller when formatting.  When interleaving is
  140          * in use, logically adjacent sectors are not physically
  141          * contiguous, but instead are separated by some number of
  142          * sectors.  It is specified as the ratio of physical sectors
  143          * traversed per logical sector.  Thus an interleave of 1:1
  144          * implies contiguous layout, while 2:1 implies that logical
  145          * sector 0 is separated by one sector from logical sector 1.
  146          * d_trackskew is the offset of sector 0 on track N relative to
  147          * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
  148          * is the offset of sector 0 on cylinder N relative to sector 0
  149          * on cylinder N-1.
  150          */
  151         u_int16_t d_rpm;                /* rotational speed */
  152         u_int16_t d_interleave;         /* hardware sector interleave */
  153         u_int16_t d_trackskew;          /* sector 0 skew, per track */
  154         u_int16_t d_cylskew;            /* sector 0 skew, per cylinder */
  155         u_int32_t d_headswitch;         /* head switch time, usec */
  156         u_int32_t d_trkseek;            /* track-to-track seek, usec */
  157         u_int32_t d_flags;              /* generic flags */
  158 #define NDDATA 5
  159         u_int32_t d_drivedata[NDDATA];  /* drive-type specific information */
  160 #define NSPARE 5
  161         u_int32_t d_spare[NSPARE];      /* reserved for future use */
  162         u_int32_t d_magic2;             /* the magic number (again) */
  163         u_int16_t d_checksum;           /* xor of data incl. partitions */
  164 
  165                         /* filesystem and partition information: */
  166         u_int16_t d_npartitions;        /* number of partitions in following */
  167         u_int32_t d_bbsize;             /* size of boot area at sn0, bytes */
  168         u_int32_t d_sbsize;             /* max size of fs superblock, bytes */
  169         struct  partition {             /* the partition table */
  170                 u_int32_t p_size;       /* number of sectors in partition */
  171                 u_int32_t p_offset;     /* starting sector */
  172                 u_int32_t p_fsize;      /* filesystem basic fragment size */
  173                 u_int8_t p_fstype;      /* filesystem type, see below */
  174                 u_int8_t p_frag;        /* filesystem fragments per block */
  175                 union {
  176                         u_int16_t cpg;  /* UFS: FS cylinders per group */
  177                         u_int16_t sgs;  /* LFS: FS segment shift */
  178                 } __partition_u1;
  179 #define p_cpg   __partition_u1.cpg
  180 #define p_sgs   __partition_u1.sgs
  181         } d_partitions[MAXPARTITIONS];  /* actually may be more */
  182 };
  183 
  184 static u_int16_t dkcksum(struct disklabel *lp);
  185 
  186 static __inline u_int16_t
  187 dkcksum(struct disklabel *lp)
  188 {
  189         u_int16_t *start, *end;
  190         u_int16_t sum = 0;
  191 
  192         start = (u_int16_t *)lp;
  193         end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
  194         while (start < end)
  195                 sum ^= *start++;
  196         return (sum);
  197 }
  198 
  199 #else /* LOCORE */
  200         /*
  201          * offsets for asm boot files.
  202          */
  203         .set    d_secsize,40
  204         .set    d_nsectors,44
  205         .set    d_ntracks,48
  206         .set    d_ncylinders,52
  207         .set    d_secpercyl,56
  208         .set    d_secperunit,60
  209         .set    d_end_,276              /* size of disk label */
  210 #endif /* LOCORE */
  211 
  212 /* d_type values: */
  213 #define DTYPE_SMD               1               /* SMD, XSMD; VAX hp/up */
  214 #define DTYPE_MSCP              2               /* MSCP */
  215 #define DTYPE_DEC               3               /* other DEC (rk, rl) */
  216 #define DTYPE_SCSI              4               /* SCSI */
  217 #define DTYPE_ESDI              5               /* ESDI interface */
  218 #define DTYPE_ST506             6               /* ST506 etc. */
  219 #define DTYPE_HPIB              7               /* CS/80 on HP-IB */
  220 #define DTYPE_HPFL              8               /* HP Fiber-link */
  221 #define DTYPE_FLOPPY            10              /* floppy */
  222 #define DTYPE_CCD               11              /* concatenated disk */
  223 #define DTYPE_VINUM             12              /* vinum volume */
  224 #define DTYPE_DOC2K             13              /* Msys DiskOnChip */
  225 
  226 #if defined(PC98) && !defined(PC98_ATCOMPAT)
  227 #define DSTYPE_SEC256           0x80            /* physical sector size=256 */
  228 #endif
  229 
  230 #ifdef DKTYPENAMES
  231 static char *dktypenames[] = {
  232         "unknown",
  233         "SMD",
  234         "MSCP",
  235         "old DEC",
  236         "SCSI",
  237         "ESDI",
  238         "ST506",
  239         "HP-IB",
  240         "HP-FL",
  241         "type 9",
  242         "floppy",
  243         "CCD",
  244         "Vinum",
  245         "DOC2K",
  246         NULL
  247 };
  248 #define DKMAXTYPES      (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
  249 #endif
  250 
  251 /*
  252  * Filesystem type and version.
  253  * Used to interpret other filesystem-specific
  254  * per-partition information.
  255  */
  256 #define FS_UNUSED       0               /* unused */
  257 #define FS_SWAP         1               /* swap */
  258 #define FS_V6           2               /* Sixth Edition */
  259 #define FS_V7           3               /* Seventh Edition */
  260 #define FS_SYSV         4               /* System V */
  261 #define FS_V71K         5               /* V7 with 1K blocks (4.1, 2.9) */
  262 #define FS_V8           6               /* Eighth Edition, 4K blocks */
  263 #define FS_BSDFFS       7               /* 4.2BSD fast file system */
  264 #define FS_MSDOS        8               /* MSDOS file system */
  265 #define FS_BSDLFS       9               /* 4.4BSD log-structured file system */
  266 #define FS_OTHER        10              /* in use, but unknown/unsupported */
  267 #define FS_HPFS         11              /* OS/2 high-performance file system */
  268 #define FS_ISO9660      12              /* ISO 9660, normally CD-ROM */
  269 #define FS_BOOT         13              /* partition contains bootstrap */
  270 #define FS_VINUM        14              /* Vinum drive */
  271 
  272 #ifdef  DKTYPENAMES
  273 static char *fstypenames[] = {
  274         "unused",
  275         "swap",
  276         "Version 6",
  277         "Version 7",
  278         "System V",
  279         "4.1BSD",
  280         "Eighth Edition",
  281         "4.2BSD",
  282         "MSDOS",
  283         "4.4LFS",
  284         "unknown",
  285         "HPFS",
  286         "ISO9660",
  287         "boot",
  288         "vinum",
  289         NULL
  290 };
  291 #define FSMAXTYPES      (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
  292 #endif
  293 
  294 /*
  295  * flags shared by various drives:
  296  */
  297 #define         D_REMOVABLE     0x01            /* removable media */
  298 #define         D_ECC           0x02            /* supports ECC */
  299 #define         D_BADSECT       0x04            /* supports bad sector forw. */
  300 #define         D_RAMDISK       0x08            /* disk emulator */
  301 #define         D_CHAIN         0x10            /* can do back-back transfers */
  302 
  303 /*
  304  * Drive data for SMD.
  305  */
  306 #define d_smdflags      d_drivedata[0]
  307 #define         D_SSE           0x1             /* supports skip sectoring */
  308 #define d_mindist       d_drivedata[1]
  309 #define d_maxdist       d_drivedata[2]
  310 #define d_sdist         d_drivedata[3]
  311 
  312 /*
  313  * Drive data for ST506.
  314  */
  315 #define d_precompcyl    d_drivedata[0]
  316 #define d_gap3          d_drivedata[1]          /* used only when formatting */
  317 
  318 /*
  319  * Drive data for SCSI.
  320  */
  321 #define d_blind         d_drivedata[0]
  322 
  323 #ifndef LOCORE
  324 /*
  325  * Structure used to perform a format or other raw operation, returning
  326  * data and/or register values.  Register identification and format
  327  * are device- and driver-dependent.
  328  */
  329 struct format_op {
  330         char    *df_buf;
  331         int      df_count;              /* value-result */
  332         daddr_t  df_startblk;
  333         int      df_reg[8];             /* result */
  334 };
  335 
  336 /*
  337  * Structure used internally to retrieve information about a partition
  338  * on a disk.
  339  */
  340 struct partinfo {
  341         struct disklabel *disklab;
  342         struct partition *part;
  343 };
  344 
  345 /* DOS partition table -- located in boot block */
  346 
  347 #if defined(PC98) && !defined(PC98_ATCOMPAT)
  348 #define DOSBBSECTOR     0       /* DOS boot block relative sector number */
  349 #define DOSLABELSECTOR  1       /* 0: 256b/s, 1: 512b/s */
  350 #define DOSPARTOFF      0
  351 #define NDOSPART        16
  352 #define DOSPTYP_386BSD  0x94    /* 386BSD partition type */
  353 #define MBR_PTYPE_FreeBSD 0x94  /* FreeBSD partition type */
  354 
  355 struct dos_partition {
  356         unsigned char   dp_mid;
  357 #define DOSMID_386BSD           (0x14|0x80) /* 386bsd|bootable */
  358         unsigned char   dp_sid;
  359 #define DOSSID_386BSD           (0x44|0x80) /* 386bsd|active */ 
  360         unsigned char   dp_dum1;
  361         unsigned char   dp_dum2;
  362         unsigned char   dp_ipl_sct;
  363         unsigned char   dp_ipl_head;
  364         unsigned short  dp_ipl_cyl;
  365         unsigned char   dp_ssect;       /* starting sector */
  366         unsigned char   dp_shd;         /* starting head */
  367         unsigned short  dp_scyl;        /* starting cylinder */
  368         unsigned char   dp_esect;       /* end sector */
  369         unsigned char   dp_ehd;         /* end head */
  370         unsigned short  dp_ecyl;        /* end cylinder */
  371         unsigned char   dp_name[16];
  372 };
  373 
  374 #else /* IBMPC */
  375 #define DOSBBSECTOR     0       /* DOS boot block relative sector number */
  376 #define DOSPARTOFF      446
  377 #define NDOSPART        4
  378 #define DOSPTYP_386BSD  0xa5    /* 386BSD partition type */
  379 #define DOSPTYP_LINSWP  0x82    /* Linux swap partition */
  380 #define DOSPTYP_LINUX   0x83    /* Linux partition */
  381 #define DOSPTYP_EXT     5       /* DOS extended partition */
  382 
  383 struct dos_partition {
  384         unsigned char   dp_flag;        /* bootstrap flags */
  385         unsigned char   dp_shd;         /* starting head */
  386         unsigned char   dp_ssect;       /* starting sector */
  387         unsigned char   dp_scyl;        /* starting cylinder */
  388         unsigned char   dp_typ;         /* partition type */
  389         unsigned char   dp_ehd;         /* end head */
  390         unsigned char   dp_esect;       /* end sector */
  391         unsigned char   dp_ecyl;        /* end cylinder */
  392         u_int32_t       dp_start;       /* absolute starting sector number */
  393         u_int32_t       dp_size;        /* partition size in sectors */
  394 };
  395 #endif
  396 
  397 #define DPSECT(s) ((s) & 0x3f)          /* isolate relevant bits of sector */
  398 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
  399 
  400 /*
  401  * Disk-specific ioctls.
  402  */
  403                 /* get and set disklabel; DIOCGPART used internally */
  404 #define DIOCGDINFO      _IOR('d', 101, struct disklabel)/* get */
  405 #define DIOCSDINFO      _IOW('d', 102, struct disklabel)/* set */
  406 #define DIOCWDINFO      _IOW('d', 103, struct disklabel)/* set, update disk */
  407 #define DIOCGPART       _IOW('d', 104, struct partinfo) /* get partition */
  408 #define DIOCGDVIRGIN    _IOR('d', 105, struct disklabel) /* get virgin label */
  409 
  410 #define DIOCWLABEL      _IOW('d', 109, int)     /* write en/disable label */
  411 
  412 #ifdef _KERNEL
  413 
  414 /*
  415  * XXX encoding of disk minor numbers, should be elsewhere.
  416  *
  417  * See <sys/reboot.h> for a possibly better encoding.
  418  *
  419  * "cpio -H newc" can be used to back up device files with large minor
  420  * numbers (but not ones >= 2^31).  Old cpio formats and all tar formats
  421  * don't have enough bits, and cpio and tar don't notice the lossage.
  422  * There are also some sign extension bugs.
  423  */
  424 
  425 /*
  426        3                   2                   1                   0
  427      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
  428     _________________________________________________________________
  429     | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
  430     -----------------------------------------------------------------
  431     |    TYPE     |UNIT_2 | SLICE   |  MAJOR?       |  UNIT   |PART |
  432     -----------------------------------------------------------------
  433 */
  434 
  435 #define DKMAXUNIT 0x1ff         /* Highest disk unit number */
  436 
  437 #define dkmakeminor(unit, slice, part) \
  438                                 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
  439                                 (((unit) & 0x1f) << 3) | (part))
  440 static __inline dev_t
  441 dkmodpart(dev_t dev, int part)
  442 {
  443         return (makedev(major(dev), (minor(dev) & ~7) | part));
  444 }
  445 
  446 static __inline dev_t
  447 dkmodslice(dev_t dev, int slice)
  448 {
  449         return (makedev(major(dev), (minor(dev) & ~0x1f0000) | (slice << 16)));
  450 }
  451 
  452 #define dkpart(dev)             (minor(dev) & 7)
  453 #define dkslice(dev)            ((minor(dev) >> 16) & 0x1f)
  454 #define dktype(dev)             ((minor(dev) >> 25) & 0x7f)
  455 
  456 static __inline u_int
  457 dkunit(dev_t dev)
  458 {
  459         return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f));
  460 }
  461 
  462 struct  buf;
  463 struct  buf_queue_head;
  464 
  465 int     bounds_check_with_label __P((struct buf *bp, struct disklabel *lp,
  466                                      int wlabel));
  467 void    diskerr __P((struct buf *bp, char *what, int pri, int blkdone,
  468                      struct disklabel *lp));
  469 void    disksort __P((struct buf *ap, struct buf *bp));
  470 char    *readdisklabel __P((dev_t dev, struct disklabel *lp));
  471 void    bufqdisksort __P((struct buf_queue_head *ap, struct buf *bp));
  472 int     setdisklabel __P((struct disklabel *olp, struct disklabel *nlp,
  473                           u_long openmask));
  474 int     writedisklabel __P((dev_t dev, struct disklabel *lp));
  475 #ifdef __alpha__
  476 void    alpha_fix_srm_checksum __P((struct buf *bp));
  477 #endif
  478 
  479 #endif /* _KERNEL */
  480 
  481 #endif /* LOCORE */
  482 
  483 #ifndef _KERNEL
  484 __BEGIN_DECLS
  485 struct disklabel *getdiskbyname __P((const char *));
  486 __END_DECLS
  487 #endif
  488 
  489 #endif /* !_SYS_DISKLABEL_H_ */

Cache object: 3b1776be3cd59c4db0a00859bf6ccf31


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.