The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/disklabel.h

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    1 /*      $NetBSD: disklabel.h,v 1.97 2005/12/29 14:53:47 tsutsui Exp $   */
    2 
    3 /*
    4  * Copyright (c) 1987, 1988, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
   32  */
   33 
   34 #ifndef _SYS_DISKLABEL_H_
   35 #define _SYS_DISKLABEL_H_
   36 
   37 /*
   38  * We need <machine/types.h> for __HAVE_OLD_DISKLABEL
   39  */
   40 #ifndef _LOCORE
   41 #include <sys/types.h>
   42 #endif
   43 
   44 /*
   45  * Each disk has a label which includes information about the hardware
   46  * disk geometry, filesystem partitions, and drive specific information.
   47  * The location of the label, as well as the number of partitions the
   48  * label can describe and the number of the "whole disk" (raw)
   49  * paritition are machine dependent.
   50  */
   51 #if HAVE_NBTOOL_CONFIG_H
   52 #include <nbinclude/machine/disklabel.h>
   53 #else
   54 #include <machine/disklabel.h>
   55 #endif /* HAVE_NBTOOL_CONFIG_H */
   56 
   57 /*
   58  * The absolute maximum number of disk partitions allowed.
   59  * This is the maximum value of MAXPARTITIONS for which 'struct disklabel'
   60  * is <= DEV_BSIZE bytes long.  If MAXPARTITIONS is greater than this, beware.
   61  */
   62 #define MAXMAXPARTITIONS        22
   63 #if MAXPARTITIONS > MAXMAXPARTITIONS
   64 #warning beware: MAXPARTITIONS bigger than MAXMAXPARTITIONS
   65 #endif
   66 
   67 /*
   68  * Ports can switch their MAXPARTITIONS once, as follows:
   69  *
   70  * - define OLDMAXPARTITIONS in <machine/disklabel.h> as the old number
   71  * - define MAXPARTITIONS as the new number
   72  * - define DISKUNIT, DISKPART and DISKMINOR macros in <machine/disklabel.h>
   73  *   as appropriate for the port (see the i386 one for an example).
   74  * - define __HAVE_OLD_DISKLABEL in <machine/types.h>
   75  */
   76 
   77 #if defined(_KERNEL) && defined(__HAVE_OLD_DISKLABEL) && \
   78            (MAXPARTITIONS < OLDMAXPARTITIONS)
   79 #error "can only grow disklabel size"
   80 #endif
   81 
   82 
   83 /*
   84  * Translate between device numbers and major/disk unit/disk partition.
   85  */
   86 #ifndef __HAVE_OLD_DISKLABEL
   87 #if !HAVE_NBTOOL_CONFIG_H
   88 #define DISKUNIT(dev)   (minor(dev) / MAXPARTITIONS)
   89 #define DISKPART(dev)   (minor(dev) % MAXPARTITIONS)
   90 #define DISKMINOR(unit, part) \
   91     (((unit) * MAXPARTITIONS) + (part))
   92 #endif /* !HAVE_NBTOOL_CONFIG_H */
   93 #endif
   94 #define MAKEDISKDEV(maj, unit, part) \
   95     (makedev((maj), DISKMINOR((unit), (part))))
   96 
   97 #define DISKMAGIC       ((uint32_t)0x82564557)  /* The disk magic number */
   98 
   99 #ifndef _LOCORE
  100 struct disklabel {
  101         uint32_t d_magic;               /* the magic number */
  102         uint16_t d_type;                /* drive type */
  103         uint16_t d_subtype;             /* controller/d_type specific */
  104         char      d_typename[16];       /* type name, e.g. "eagle" */
  105 
  106         /*
  107          * d_packname contains the pack identifier and is returned when
  108          * the disklabel is read off the disk or in-core copy.
  109          * d_boot0 and d_boot1 are the (optional) names of the
  110          * primary (block 0) and secondary (block 1-15) bootstraps
  111          * as found in /usr/mdec.  These are returned when using
  112          * getdiskbyname(3) to retrieve the values from /etc/disktab.
  113          */
  114         union {
  115                 char    un_d_packname[16];      /* pack identifier */
  116                 struct {
  117                         char *un_d_boot0;       /* primary bootstrap name */
  118                         char *un_d_boot1;       /* secondary bootstrap name */
  119                 } un_b;
  120         } d_un;
  121 #define d_packname      d_un.un_d_packname
  122 #define d_boot0         d_un.un_b.un_d_boot0
  123 #define d_boot1         d_un.un_b.un_d_boot1
  124 
  125                         /* disk geometry: */
  126         uint32_t d_secsize;             /* # of bytes per sector */
  127         uint32_t d_nsectors;            /* # of data sectors per track */
  128         uint32_t d_ntracks;             /* # of tracks per cylinder */
  129         uint32_t d_ncylinders;          /* # of data cylinders per unit */
  130         uint32_t d_secpercyl;           /* # of data sectors per cylinder */
  131         uint32_t d_secperunit;          /* # of data sectors per unit */
  132 
  133         /*
  134          * Spares (bad sector replacements) below are not counted in
  135          * d_nsectors or d_secpercyl.  Spare sectors are assumed to
  136          * be physical sectors which occupy space at the end of each
  137          * track and/or cylinder.
  138          */
  139         uint16_t d_sparespertrack;      /* # of spare sectors per track */
  140         uint16_t d_sparespercyl;        /* # of spare sectors per cylinder */
  141         /*
  142          * Alternative cylinders include maintenance, replacement,
  143          * configuration description areas, etc.
  144          */
  145         uint32_t d_acylinders;          /* # of alt. cylinders per unit */
  146 
  147                         /* hardware characteristics: */
  148         /*
  149          * d_interleave, d_trackskew and d_cylskew describe perturbations
  150          * in the media format used to compensate for a slow controller.
  151          * Interleave is physical sector interleave, set up by the
  152          * formatter or controller when formatting.  When interleaving is
  153          * in use, logically adjacent sectors are not physically
  154          * contiguous, but instead are separated by some number of
  155          * sectors.  It is specified as the ratio of physical sectors
  156          * traversed per logical sector.  Thus an interleave of 1:1
  157          * implies contiguous layout, while 2:1 implies that logical
  158          * sector 0 is separated by one sector from logical sector 1.
  159          * d_trackskew is the offset of sector 0 on track N relative to
  160          * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
  161          * is the offset of sector 0 on cylinder N relative to sector 0
  162          * on cylinder N-1.
  163          */
  164         uint16_t d_rpm;         /* rotational speed */
  165         uint16_t d_interleave;          /* hardware sector interleave */
  166         uint16_t d_trackskew;           /* sector 0 skew, per track */
  167         uint16_t d_cylskew;             /* sector 0 skew, per cylinder */
  168         uint32_t d_headswitch;          /* head switch time, usec */
  169         uint32_t d_trkseek;             /* track-to-track seek, usec */
  170         uint32_t d_flags;               /* generic flags */
  171 #define NDDATA 5
  172         uint32_t d_drivedata[NDDATA];   /* drive-type specific information */
  173 #define NSPARE 5
  174         uint32_t d_spare[NSPARE];       /* reserved for future use */
  175         uint32_t d_magic2;              /* the magic number (again) */
  176         uint16_t d_checksum;            /* xor of data incl. partitions */
  177 
  178                         /* filesystem and partition information: */
  179         uint16_t d_npartitions; /* number of partitions in following */
  180         uint32_t d_bbsize;              /* size of boot area at sn0, bytes */
  181         uint32_t d_sbsize;              /* max size of fs superblock, bytes */
  182         struct  partition {             /* the partition table */
  183                 uint32_t p_size;        /* number of sectors in partition */
  184                 uint32_t p_offset;      /* starting sector */
  185                 union {
  186                         uint32_t fsize; /* FFS, ADOS:
  187                                             filesystem basic fragment size */
  188                         uint32_t cdsession; /* ISO9660: session offset */
  189                 } __partition_u2;
  190 #define p_fsize         __partition_u2.fsize
  191 #define p_cdsession     __partition_u2.cdsession
  192                 uint8_t p_fstype;       /* filesystem type, see below */
  193                 uint8_t p_frag; /* filesystem fragments per block */
  194                 union {
  195                         uint16_t cpg;   /* UFS: FS cylinders per group */
  196                         uint16_t sgs;   /* LFS: FS segment shift */
  197                 } __partition_u1;
  198 #define p_cpg   __partition_u1.cpg
  199 #define p_sgs   __partition_u1.sgs
  200         } d_partitions[MAXPARTITIONS];  /* actually may be more */
  201 };
  202 
  203 #if defined(__HAVE_OLD_DISKLABEL) && !HAVE_NBTOOL_CONFIG_H
  204 /*
  205  * Same as above, but with OLDMAXPARTITIONS partitions. For use in
  206  * the old DIOC* ioctl calls.
  207  */
  208 struct olddisklabel {
  209         uint32_t d_magic;
  210         uint16_t d_type;
  211         uint16_t d_subtype;
  212         char      d_typename[16];
  213         union {
  214                 char    un_d_packname[16];
  215                 struct {
  216                         char *un_d_boot0;
  217                         char *un_d_boot1;
  218                 } un_b;
  219         } d_un;
  220         uint32_t d_secsize;
  221         uint32_t d_nsectors;
  222         uint32_t d_ntracks;
  223         uint32_t d_ncylinders;
  224         uint32_t d_secpercyl;
  225         uint32_t d_secperunit;
  226         uint16_t d_sparespertrack;
  227         uint16_t d_sparespercyl;
  228         uint32_t d_acylinders;
  229         uint16_t d_rpm;
  230         uint16_t d_interleave;
  231         uint16_t d_trackskew;
  232         uint16_t d_cylskew;
  233         uint32_t d_headswitch;
  234         uint32_t d_trkseek;
  235         uint32_t d_flags;
  236         uint32_t d_drivedata[NDDATA];
  237         uint32_t d_spare[NSPARE];
  238         uint32_t d_magic2;
  239         uint16_t d_checksum;
  240         uint16_t d_npartitions;
  241         uint32_t d_bbsize;
  242         uint32_t d_sbsize;
  243         struct  opartition {
  244                 uint32_t p_size;
  245                 uint32_t p_offset;
  246                 union {
  247                         uint32_t fsize;
  248                         uint32_t cdsession;
  249                 } __partition_u2;
  250                 uint8_t p_fstype;
  251                 uint8_t p_frag;
  252                 union {
  253                         uint16_t cpg;
  254                         uint16_t sgs;
  255                 } __partition_u1;
  256         } d_partitions[OLDMAXPARTITIONS];
  257 };
  258 #endif /* __HAVE_OLD_DISKLABEL */
  259 #else /* _LOCORE */
  260         /*
  261          * offsets for asm boot files.
  262          */
  263         .set    d_secsize,40
  264         .set    d_nsectors,44
  265         .set    d_ntracks,48
  266         .set    d_ncylinders,52
  267         .set    d_secpercyl,56
  268         .set    d_secperunit,60
  269         .set    d_end_,276              /* size of disk label */
  270 #endif /* _LOCORE */
  271 
  272 /*
  273  * We normally use C99 initialisers (just in case the lists below are out
  274  * of sequence, or have gaps), but lint doesn't grok them.
  275  * Maybe some host compilers don't either, but many have for quite some time.
  276  */
  277 
  278 #ifndef lint
  279 #define ARRAY_INIT(element,value) [element]=value
  280 #else
  281 #define ARRAY_INIT(element,value) value
  282 #endif
  283 
  284 /* Use pre-processor magic to get all the parameters one one line... */
  285 
  286 /* d_type values: */
  287 #define DKTYPE_DEFN(x) \
  288 x(UNKNOWN,      0,      "unknown") \
  289 x(SMD,          1,      "SMD")          /* SMD, XSMD; VAX hp/up */ \
  290 x(MSCP,         2,      "MSCP")         /* MSCP */ \
  291 x(DEC,          3,      "old DEC")      /* other DEC (rk, rl) */ \
  292 x(SCSI,         4,      "SCSI")         /* SCSI */ \
  293 x(ESDI,         5,      "ESDI")         /* ESDI interface */ \
  294 x(ST506,        6,      "ST506")        /* ST506 etc. */ \
  295 x(HPIB,         7,      "HP-IB")        /* CS/80 on HP-IB */ \
  296 x(HPFL,         8,      "HP-FL")        /* HP Fiber-link */ \
  297 x(TYPE_9,       9,      "type 9") \
  298 x(FLOPPY,       10,     "floppy")       /* floppy */ \
  299 x(CCD,          11,     "ccd")          /* concatenated disk device */ \
  300 x(VND,          12,     "vnd")          /* uvnode pseudo-disk */ \
  301 x(ATAPI,        13,     "ATAPI")        /* ATAPI */ \
  302 x(RAID,         14,     "RAID")         /* RAIDframe */ \
  303 x(LD,           15,     "ld")           /* logical disk */ \
  304 x(JFS2,         16,     "jfs")          /* IBM JFS2 */ \
  305 x(CGD,          17,     "cgd")          /* cryptographic pseudo-disk */ \
  306 x(VINUM,        18,     "vinum")        /* vinum volume */ \
  307 x(FLASH,        19,     "flash")        /* flash memory devices */ \
  308 
  309 #ifndef OMIT_DKTYPENUMS
  310 #define DKTYPE_NUMS(tag, number, name) __CONCAT(DTYPE_,tag=number),
  311 enum { DKTYPE_DEFN(DKTYPE_NUMS) DKMAXTYPES };
  312 #undef  DKTYPE_NUMS
  313 #endif /* OMIT_DKTYPENUMS */
  314 
  315 #ifdef DKTYPENAMES
  316 #define DKTYPE_NAMES(tag, number, name) ARRAY_INIT(number,name),
  317 static const char *const dktypenames[] = { DKTYPE_DEFN(DKTYPE_NAMES) NULL };
  318 #undef  DKTYPE_NAMES
  319 #endif
  320 
  321 /*
  322  * Partition type names, numbers, label-names, fsck prog, and mount prog
  323  */
  324 #define FSTYPE_DEFN(x) \
  325 x(UNUSED,   0, "unused",     NULL,    NULL)   /* unused */ \
  326 x(SWAP,     1, "swap",       NULL,    NULL)   /* swap */ \
  327 x(V6,       2, "Version 6",  NULL,    NULL)   /* Sixth Edition */ \
  328 x(V7,       3, "Version 7",  NULL,    NULL)   /* Seventh Edition */ \
  329 x(SYSV,     4, "System V",   NULL,    NULL)   /* System V */ \
  330 x(V71K,     5, "4.1BSD",     NULL,    NULL)   /* V7, 1K blocks (4.1, 2.9) */ \
  331 x(V8,    6, "Eighth Edition",NULL,    NULL)   /* Eighth Edition, 4K blocks */ \
  332 x(BSDFFS,   7, "4.2BSD",    "ffs",   "ffs")   /* 4.2BSD fast file system */ \
  333 x(MSDOS,    8, "MSDOS",     "msdos", "msdos") /* MSDOS file system */ \
  334 x(BSDLFS,   9, "4.4LFS",    "lfs",   "lfs")   /* 4.4BSD log-structured FS */ \
  335 x(OTHER,   10, "unknown",    NULL,    NULL)   /* in use, unknown/unsupported */\
  336 x(HPFS,    11, "HPFS",       NULL,    NULL)   /* OS/2 high-performance FS */ \
  337 x(ISO9660, 12, "ISO9660",    NULL,   "cd9660")/* ISO 9660, normally CD-ROM */ \
  338 x(BOOT,    13, "boot",       NULL,    NULL)   /* bootstrap code in partition */\
  339 x(ADOS,    14, "ADOS",       NULL,   "ados")  /* AmigaDOS fast file system */ \
  340 x(HFS,     15, "HFS",        NULL,    NULL)   /* Macintosh HFS */ \
  341 x(FILECORE,16, "FILECORE",   NULL, "filecore")/* Acorn Filecore FS */ \
  342 x(EX2FS,   17, "Linux Ext2","ext2fs","ext2fs")/* Linux Extended 2 FS */ \
  343 x(NTFS,    18, "NTFS",       NULL,   "ntfs")  /* Windows/NT file system */ \
  344 x(RAID,    19, "RAID",       NULL,    NULL)   /* RAIDframe component */ \
  345 x(CCD,     20, "ccd",        NULL,    NULL)   /* concatenated disk component */\
  346 x(JFS2,    21, "jfs",        NULL,    NULL)   /* IBM JFS2 */ \
  347 x(APPLEUFS,22, "Apple UFS", "ffs",   "ffs")   /* Apple UFS */ \
  348 /* XXX this is not the same as FreeBSD.  How to solve? */ \
  349 x(VINUM,   23, "vinum",      NULL,    NULL)   /* Vinum */ \
  350 x(UDF,     24, "UDF",        NULL,   "udf")  /* UDF */ \
  351 x(SYSVBFS, 25, "SysVBFS",    NULL,  "sysvbfs")/* System V boot file system */ \
  352 
  353 #ifndef OMIT_FSTYPENUMS
  354 #define FS_TYPENUMS(tag, number, name, fsck, mount) __CONCAT(FS_,tag=number),
  355 enum { FSTYPE_DEFN(FS_TYPENUMS) FSMAXTYPES };
  356 #undef  FS_TYPENUMS
  357 #endif /* OMIT_FSTYPENUMS */
  358 
  359 #ifdef  FSTYPENAMES
  360 #define FS_TYPENAMES(tag, number, name, fsck, mount) ARRAY_INIT(number,name),
  361 static const char *const fstypenames[] = { FSTYPE_DEFN(FS_TYPENAMES) NULL };
  362 #undef  FS_TYPENAMES
  363 #endif
  364 
  365 #ifdef FSCKNAMES
  366 /* These are the names MOUNT_XXX from <sys/mount.h> */
  367 #define FS_FSCKNAMES(tag, number, name, fsck, mount) ARRAY_INIT(number,fsck),
  368 static const char *const fscknames[] = { FSTYPE_DEFN(FS_FSCKNAMES) NULL };
  369 #undef  FS_FSCKNAMES
  370 #define FSMAXNAMES      FSMAXTYPES
  371 #endif
  372 
  373 #ifdef MOUNTNAMES
  374 /* These are the names MOUNT_XXX from <sys/mount.h> */
  375 #define FS_MOUNTNAMES(tag, number, name, fsck, mount) ARRAY_INIT(number,mount),
  376 static const char *const mountnames[] = { FSTYPE_DEFN(FS_MOUNTNAMES) NULL };
  377 #undef  FS_MOUNTNAMES
  378 #define FSMAXMOUNTNAMES FSMAXTYPES
  379 #endif
  380 
  381 /*
  382  * flags shared by various drives:
  383  */
  384 #define         D_REMOVABLE     0x01            /* removable media */
  385 #define         D_ECC           0x02            /* supports ECC */
  386 #define         D_BADSECT       0x04            /* supports bad sector forw. */
  387 #define         D_RAMDISK       0x08            /* disk emulator */
  388 #define         D_CHAIN         0x10            /* can do back-back transfers */
  389 
  390 /*
  391  * Drive data for SMD.
  392  */
  393 #define d_smdflags      d_drivedata[0]
  394 #define         D_SSE           0x1             /* supports skip sectoring */
  395 #define d_mindist       d_drivedata[1]
  396 #define d_maxdist       d_drivedata[2]
  397 #define d_sdist         d_drivedata[3]
  398 
  399 /*
  400  * Drive data for ST506.
  401  */
  402 #define d_precompcyl    d_drivedata[0]
  403 #define d_gap3          d_drivedata[1]          /* used only when formatting */
  404 
  405 /*
  406  * Drive data for SCSI.
  407  */
  408 #define d_blind         d_drivedata[0]
  409 
  410 #ifndef _LOCORE
  411 /*
  412  * Structure used to perform a format or other raw operation,
  413  * returning data and/or register values.  Register identification
  414  * and format are device- and driver-dependent. Currently unused.
  415  */
  416 struct format_op {
  417         char    *df_buf;
  418         int      df_count;              /* value-result */
  419         daddr_t  df_startblk;
  420         int      df_reg[8];             /* result */
  421 };
  422 
  423 /*
  424  * Structure used internally to retrieve information about a partition
  425  * on a disk.
  426  */
  427 struct partinfo {
  428         struct disklabel *disklab;
  429         struct partition *part;
  430 };
  431 
  432 #ifdef _KERNEL
  433 
  434 struct disk;
  435 
  436 void     diskerr(const struct buf *, const char *, const char *, int,
  437             int, const struct disklabel *);
  438 u_int    dkcksum(struct disklabel *);
  439 int      setdisklabel(struct disklabel *, struct disklabel *, u_long,
  440             struct cpu_disklabel *);
  441 const char *readdisklabel(dev_t, void (*)(struct buf *),
  442             struct disklabel *, struct cpu_disklabel *);
  443 int      writedisklabel(dev_t, void (*)(struct buf *), struct disklabel *,
  444             struct cpu_disklabel *);
  445 int      bounds_check_with_label(struct disk *, struct buf *, int);
  446 int      bounds_check_with_mediasize(struct buf *, int, uint64_t);
  447 #endif
  448 #endif /* _LOCORE */
  449 
  450 #if !defined(_KERNEL) && !defined(_LOCORE)
  451 
  452 #include <sys/cdefs.h>
  453 
  454 #endif
  455 
  456 #endif /* !_SYS_DISKLABEL_H_ */

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