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 /*-
    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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
   30  * $FreeBSD: releng/7.3/sys/sys/disklabel.h 177227 2008-03-15 14:41:27Z remko $
   31  */
   32 
   33 #ifndef _SYS_DISKLABEL_H_
   34 #define _SYS_DISKLABEL_H_
   35 
   36 #ifndef _KERNEL
   37 #include <sys/types.h>
   38 #endif
   39 #include <sys/ioccom.h>
   40 
   41 /*
   42  * Disk description table, see disktab(5)
   43  */
   44 #define _PATH_DISKTAB   "/etc/disktab"
   45 
   46 /*
   47  * Each disk has a label which includes information about the hardware
   48  * disk geometry, filesystem partitions, and drive specific information.
   49  * The label is in block 0 or 1, possibly offset from the beginning
   50  * to leave room for a bootstrap, etc.
   51  */
   52 
   53 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
   54 #if defined(__i386__) || defined(__amd64__) || defined(__arm__) || \
   55     defined(__ia64__)
   56 #define LABELSECTOR     1                       /* sector containing label */
   57 #define LABELOFFSET     0                       /* offset of label in sector */
   58 #endif
   59 
   60 #define DISKMAGIC       ((u_int32_t)0x82564557) /* The disk magic number */
   61 #ifndef MAXPARTITIONS
   62 #define MAXPARTITIONS   8
   63 #endif
   64 
   65 /* Size of bootblock area in sector-size neutral bytes */
   66 #define BBSIZE          8192
   67 
   68 #define LABEL_PART      2               /* partition containing label */
   69 #define RAW_PART        2               /* partition containing whole disk */
   70 #define SWAP_PART       1               /* partition normally containing swap */
   71 
   72 struct disklabel {
   73         u_int32_t d_magic;              /* the magic number */
   74         u_int16_t d_type;               /* drive type */
   75         u_int16_t d_subtype;            /* controller/d_type specific */
   76         char      d_typename[16];       /* type name, e.g. "eagle" */
   77 
   78         char      d_packname[16];       /* pack identifier */
   79 
   80                         /* disk geometry: */
   81         u_int32_t d_secsize;            /* # of bytes per sector */
   82         u_int32_t d_nsectors;           /* # of data sectors per track */
   83         u_int32_t d_ntracks;            /* # of tracks per cylinder */
   84         u_int32_t d_ncylinders;         /* # of data cylinders per unit */
   85         u_int32_t d_secpercyl;          /* # of data sectors per cylinder */
   86         u_int32_t d_secperunit;         /* # of data sectors per unit */
   87 
   88         /*
   89          * Spares (bad sector replacements) below are not counted in
   90          * d_nsectors or d_secpercyl.  Spare sectors are assumed to
   91          * be physical sectors which occupy space at the end of each
   92          * track and/or cylinder.
   93          */
   94         u_int16_t d_sparespertrack;     /* # of spare sectors per track */
   95         u_int16_t d_sparespercyl;       /* # of spare sectors per cylinder */
   96         /*
   97          * Alternate cylinders include maintenance, replacement, configuration
   98          * description areas, etc.
   99          */
  100         u_int32_t d_acylinders;         /* # of alt. cylinders per unit */
  101 
  102                         /* hardware characteristics: */
  103         /*
  104          * d_interleave, d_trackskew and d_cylskew describe perturbations
  105          * in the media format used to compensate for a slow controller.
  106          * Interleave is physical sector interleave, set up by the
  107          * formatter or controller when formatting.  When interleaving is
  108          * in use, logically adjacent sectors are not physically
  109          * contiguous, but instead are separated by some number of
  110          * sectors.  It is specified as the ratio of physical sectors
  111          * traversed per logical sector.  Thus an interleave of 1:1
  112          * implies contiguous layout, while 2:1 implies that logical
  113          * sector 0 is separated by one sector from logical sector 1.
  114          * d_trackskew is the offset of sector 0 on track N relative to
  115          * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
  116          * is the offset of sector 0 on cylinder N relative to sector 0
  117          * on cylinder N-1.
  118          */
  119         u_int16_t d_rpm;                /* rotational speed */
  120         u_int16_t d_interleave;         /* hardware sector interleave */
  121         u_int16_t d_trackskew;          /* sector 0 skew, per track */
  122         u_int16_t d_cylskew;            /* sector 0 skew, per cylinder */
  123         u_int32_t d_headswitch;         /* head switch time, usec */
  124         u_int32_t d_trkseek;            /* track-to-track seek, usec */
  125         u_int32_t d_flags;              /* generic flags */
  126 #define NDDATA 5
  127         u_int32_t d_drivedata[NDDATA];  /* drive-type specific information */
  128 #define NSPARE 5
  129         u_int32_t d_spare[NSPARE];      /* reserved for future use */
  130         u_int32_t d_magic2;             /* the magic number (again) */
  131         u_int16_t d_checksum;           /* xor of data incl. partitions */
  132 
  133                         /* filesystem and partition information: */
  134         u_int16_t d_npartitions;        /* number of partitions in following */
  135         u_int32_t d_bbsize;             /* size of boot area at sn0, bytes */
  136         u_int32_t d_sbsize;             /* max size of fs superblock, bytes */
  137         struct partition {              /* the partition table */
  138                 u_int32_t p_size;       /* number of sectors in partition */
  139                 u_int32_t p_offset;     /* starting sector */
  140                 u_int32_t p_fsize;      /* filesystem basic fragment size */
  141                 u_int8_t p_fstype;      /* filesystem type, see below */
  142                 u_int8_t p_frag;        /* filesystem fragments per block */
  143                 u_int16_t p_cpg;        /* filesystem cylinders per group */
  144         } d_partitions[MAXPARTITIONS];  /* actually may be more */
  145 };
  146 
  147 #ifdef CTASSERT
  148 CTASSERT(sizeof(struct disklabel) == 148 + MAXPARTITIONS * 16);
  149 #endif
  150 
  151 static __inline u_int16_t dkcksum(struct disklabel *lp);
  152 static __inline u_int16_t
  153 dkcksum(struct disklabel *lp)
  154 {
  155         u_int16_t *start, *end;
  156         u_int16_t sum = 0;
  157 
  158         start = (u_int16_t *)lp;
  159         end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
  160         while (start < end)
  161                 sum ^= *start++;
  162         return (sum);
  163 }
  164 
  165 
  166 /* d_type values: */
  167 #define DTYPE_SMD               1               /* SMD, XSMD; VAX hp/up */
  168 #define DTYPE_MSCP              2               /* MSCP */
  169 #define DTYPE_DEC               3               /* other DEC (rk, rl) */
  170 #define DTYPE_SCSI              4               /* SCSI */
  171 #define DTYPE_ESDI              5               /* ESDI interface */
  172 #define DTYPE_ST506             6               /* ST506 etc. */
  173 #define DTYPE_HPIB              7               /* CS/80 on HP-IB */
  174 #define DTYPE_HPFL              8               /* HP Fiber-link */
  175 #define DTYPE_FLOPPY            10              /* floppy */
  176 #define DTYPE_CCD               11              /* concatenated disk */
  177 #define DTYPE_VINUM             12              /* vinum volume */
  178 #define DTYPE_DOC2K             13              /* Msys DiskOnChip */
  179 #define DTYPE_RAID              14              /* CMU RAIDFrame */
  180 #define DTYPE_JFS2              16              /* IBM JFS 2 */
  181 
  182 #ifdef DKTYPENAMES
  183 static const char *dktypenames[] = {
  184         "unknown",
  185         "SMD",
  186         "MSCP",
  187         "old DEC",
  188         "SCSI",
  189         "ESDI",
  190         "ST506",
  191         "HP-IB",
  192         "HP-FL",
  193         "type 9",
  194         "floppy",
  195         "CCD",
  196         "Vinum",
  197         "DOC2K",
  198         "Raid",
  199         "?",
  200         "jfs",
  201         NULL
  202 };
  203 #define DKMAXTYPES      (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
  204 #endif
  205 
  206 /*
  207  * Filesystem type and version.
  208  * Used to interpret other filesystem-specific
  209  * per-partition information.
  210  */
  211 #define FS_UNUSED       0               /* unused */
  212 #define FS_SWAP         1               /* swap */
  213 #define FS_V6           2               /* Sixth Edition */
  214 #define FS_V7           3               /* Seventh Edition */
  215 #define FS_SYSV         4               /* System V */
  216 #define FS_V71K         5               /* V7 with 1K blocks (4.1, 2.9) */
  217 #define FS_V8           6               /* Eighth Edition, 4K blocks */
  218 #define FS_BSDFFS       7               /* 4.2BSD fast filesystem */
  219 #define FS_MSDOS        8               /* MSDOS filesystem */
  220 #define FS_BSDLFS       9               /* 4.4BSD log-structured filesystem */
  221 #define FS_OTHER        10              /* in use, but unknown/unsupported */
  222 #define FS_HPFS         11              /* OS/2 high-performance filesystem */
  223 #define FS_ISO9660      12              /* ISO 9660, normally CD-ROM */
  224 #define FS_BOOT         13              /* partition contains bootstrap */
  225 #define FS_VINUM        14              /* Vinum drive */
  226 #define FS_RAID         15              /* RAIDFrame drive */
  227 #define FS_FILECORE     16              /* Acorn Filecore Filing System */
  228 #define FS_EXT2FS       17              /* ext2fs */
  229 #define FS_NTFS         18              /* Windows/NT file system */
  230 #define FS_CCD          20              /* concatenated disk component */
  231 #define FS_JFS2         21              /* IBM JFS2 */
  232 #define FS_UDF          24              /* UDF */
  233 #define FS_EFS          26              /* SGI's Extent File system */
  234 #define FS_ZFS          27              /* Sun's ZFS */
  235 
  236 #ifdef  FSTYPENAMES
  237 static const char *fstypenames[] = {
  238         "unused",
  239         "swap",
  240         "Version 6",
  241         "Version 7",
  242         "System V",
  243         "4.1BSD",
  244         "Eighth Edition",
  245         "4.2BSD",
  246         "MSDOS",
  247         "4.4LFS",
  248         "unknown",
  249         "HPFS",
  250         "ISO9660",
  251         "boot",
  252         "vinum",
  253         "raid",
  254         "Filecore",
  255         "EXT2FS",
  256         "NTFS",
  257         "?",
  258         "ccd",
  259         "jfs",
  260         "?",
  261         "?",
  262         "UDF",
  263         "?",
  264         "EFS",
  265         "ZFS",
  266         NULL
  267 };
  268 #define FSMAXTYPES      (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
  269 #endif
  270 
  271 /*
  272  * flags shared by various drives:
  273  */
  274 #define D_REMOVABLE     0x01            /* removable media */
  275 #define D_ECC           0x02            /* supports ECC */
  276 #define D_BADSECT       0x04            /* supports bad sector forw. */
  277 #define D_RAMDISK       0x08            /* disk emulator */
  278 #define D_CHAIN         0x10            /* can do back-back transfers */
  279 
  280 /*
  281  * Disklabel-specific ioctls.
  282  *
  283  * NB: <sys/disk.h> defines ioctls from 'd'/128 and up.
  284  */
  285                 /* get and set disklabel */
  286 #define DIOCGDINFO      _IOR('d', 101, struct disklabel)/* get */
  287 #define DIOCSDINFO      _IOW('d', 102, struct disklabel)/* set */
  288 #define DIOCWDINFO      _IOW('d', 103, struct disklabel)/* set, update disk */
  289 #define DIOCBSDBB       _IOW('d', 110, void *)  /* write bootblocks */
  290 
  291 /*
  292  * Functions for proper encoding/decoding of struct disklabel into/from
  293  * bytestring.
  294  */
  295 void bsd_partition_le_dec(u_char *ptr, struct partition *d);
  296 int bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart);
  297 void bsd_partition_le_enc(u_char *ptr, struct partition *d);
  298 void bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d);
  299 
  300 #ifndef _KERNEL
  301 __BEGIN_DECLS
  302 struct disklabel *getdiskbyname(const char *);
  303 __END_DECLS
  304 #endif
  305 
  306 #endif /* !_SYS_DISKLABEL_H_ */

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