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

     /*-
      * Copyright (c) 1987, 1988, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
     * $FreeBSD: src/sys/sys/disklabel.h,v 1.105.2.1 2005/01/31 23:26:56 imp Exp $
     */
    
    #ifndef _SYS_DISKLABEL_H_
    #define _SYS_DISKLABEL_H_
    
    #ifndef _KERNEL
    #include <sys/types.h>
    #endif
    #include <sys/ioccom.h>
    
    /*
     * Disk description table, see disktab(5)
     */
    #define _PATH_DISKTAB   "/etc/disktab"
    
    /*
     * Each disk has a label which includes information about the hardware
     * disk geometry, filesystem partitions, and drive specific information.
     * The label is in block 0 or 1, possibly offset from the beginning
     * to leave room for a bootstrap, etc.
     */
    
    /* XXX these should be defined per controller (or drive) elsewhere, not here! */
    #if defined(__i386__) || defined(__amd64__) || defined(__ia64__)
    #define LABELSECTOR     1                       /* sector containing label */
    #define LABELOFFSET     0                       /* offset of label in sector */
    #endif
    
    #ifdef __alpha__
    #define LABELSECTOR     0
    #define LABELOFFSET     64
    #endif
    
    #define DISKMAGIC       ((u_int32_t)0x82564557) /* The disk magic number */
    #ifndef MAXPARTITIONS
    #define MAXPARTITIONS   8
    #endif
    
    /* Size of bootblock area in sector-size neutral bytes */
    #define BBSIZE          8192
    
    #define LABEL_PART      2               /* partition containing label */
    #define RAW_PART        2               /* partition containing whole disk */
    #define SWAP_PART       1               /* partition normally containing swap */
    
    struct disklabel {
            u_int32_t d_magic;              /* the magic number */
            u_int16_t d_type;               /* drive type */
            u_int16_t d_subtype;            /* controller/d_type specific */
            char      d_typename[16];       /* type name, e.g. "eagle" */
    
            char      d_packname[16];       /* pack identifier */
    
                            /* disk geometry: */
            u_int32_t d_secsize;            /* # of bytes per sector */
            u_int32_t d_nsectors;           /* # of data sectors per track */
            u_int32_t d_ntracks;            /* # of tracks per cylinder */
            u_int32_t d_ncylinders;         /* # of data cylinders per unit */
            u_int32_t d_secpercyl;          /* # of data sectors per cylinder */
            u_int32_t d_secperunit;         /* # of data sectors per unit */
    
            /*
             * Spares (bad sector replacements) below are not counted in
             * d_nsectors or d_secpercyl.  Spare sectors are assumed to
             * be physical sectors which occupy space at the end of each
             * track and/or cylinder.
             */
            u_int16_t d_sparespertrack;     /* # of spare sectors per track */
            u_int16_t d_sparespercyl;       /* # of spare sectors per cylinder */
           /*
            * Alternate cylinders include maintenance, replacement, configuration
            * description areas, etc.
            */
           u_int32_t d_acylinders;         /* # of alt. cylinders per unit */
   
                           /* hardware characteristics: */
           /*
            * d_interleave, d_trackskew and d_cylskew describe perturbations
            * in the media format used to compensate for a slow controller.
            * Interleave is physical sector interleave, set up by the
            * formatter or controller when formatting.  When interleaving is
            * in use, logically adjacent sectors are not physically
            * contiguous, but instead are separated by some number of
            * sectors.  It is specified as the ratio of physical sectors
            * traversed per logical sector.  Thus an interleave of 1:1
            * implies contiguous layout, while 2:1 implies that logical
            * sector 0 is separated by one sector from logical sector 1.
            * d_trackskew is the offset of sector 0 on track N relative to
            * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
            * is the offset of sector 0 on cylinder N relative to sector 0
            * on cylinder N-1.
            */
           u_int16_t d_rpm;                /* rotational speed */
           u_int16_t d_interleave;         /* hardware sector interleave */
           u_int16_t d_trackskew;          /* sector 0 skew, per track */
           u_int16_t d_cylskew;            /* sector 0 skew, per cylinder */
           u_int32_t d_headswitch;         /* head switch time, usec */
           u_int32_t d_trkseek;            /* track-to-track seek, usec */
           u_int32_t d_flags;              /* generic flags */
   #define NDDATA 5
           u_int32_t d_drivedata[NDDATA];  /* drive-type specific information */
   #define NSPARE 5
           u_int32_t d_spare[NSPARE];      /* reserved for future use */
           u_int32_t d_magic2;             /* the magic number (again) */
           u_int16_t d_checksum;           /* xor of data incl. partitions */
   
                           /* filesystem and partition information: */
           u_int16_t d_npartitions;        /* number of partitions in following */
           u_int32_t d_bbsize;             /* size of boot area at sn0, bytes */
           u_int32_t d_sbsize;             /* max size of fs superblock, bytes */
           struct partition {              /* the partition table */
                   u_int32_t p_size;       /* number of sectors in partition */
                   u_int32_t p_offset;     /* starting sector */
                   u_int32_t p_fsize;      /* filesystem basic fragment size */
                   u_int8_t p_fstype;      /* filesystem type, see below */
                   u_int8_t p_frag;        /* filesystem fragments per block */
                   u_int16_t p_cpg;        /* filesystem cylinders per group */
           } d_partitions[MAXPARTITIONS];  /* actually may be more */
   };
   
   #ifdef CTASSERT
   CTASSERT(sizeof(struct disklabel) == 148 + MAXPARTITIONS * 16);
   #endif
   
   static __inline u_int16_t dkcksum(struct disklabel *lp);
   static __inline u_int16_t
   dkcksum(struct disklabel *lp)
   {
           u_int16_t *start, *end;
           u_int16_t sum = 0;
   
           start = (u_int16_t *)lp;
           end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
           while (start < end)
                   sum ^= *start++;
           return (sum);
   }
   
   
   /* d_type values: */
   #define DTYPE_SMD               1               /* SMD, XSMD; VAX hp/up */
   #define DTYPE_MSCP              2               /* MSCP */
   #define DTYPE_DEC               3               /* other DEC (rk, rl) */
   #define DTYPE_SCSI              4               /* SCSI */
   #define DTYPE_ESDI              5               /* ESDI interface */
   #define DTYPE_ST506             6               /* ST506 etc. */
   #define DTYPE_HPIB              7               /* CS/80 on HP-IB */
   #define DTYPE_HPFL              8               /* HP Fiber-link */
   #define DTYPE_FLOPPY            10              /* floppy */
   #define DTYPE_CCD               11              /* concatenated disk */
   #define DTYPE_VINUM             12              /* vinum volume */
   #define DTYPE_DOC2K             13              /* Msys DiskOnChip */
   #define DTYPE_RAID              14              /* CMU RAIDFrame */
   #define DTYPE_JFS2              16              /* IBM JFS 2 */
   
   #ifdef DKTYPENAMES
   static const char *dktypenames[] = {
           "unknown",
           "SMD",
           "MSCP",
           "old DEC",
           "SCSI",
           "ESDI",
           "ST506",
           "HP-IB",
           "HP-FL",
           "type 9",
           "floppy",
           "CCD",
           "Vinum",
           "DOC2K",
           "Raid",
           "?",
           "jfs",
           NULL
   };
   #define DKMAXTYPES      (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
   #endif
   
   /*
    * Filesystem type and version.
    * Used to interpret other filesystem-specific
    * per-partition information.
    */
   #define FS_UNUSED       0               /* unused */
   #define FS_SWAP         1               /* swap */
   #define FS_V6           2               /* Sixth Edition */
   #define FS_V7           3               /* Seventh Edition */
   #define FS_SYSV         4               /* System V */
   #define FS_V71K         5               /* V7 with 1K blocks (4.1, 2.9) */
   #define FS_V8           6               /* Eighth Edition, 4K blocks */
   #define FS_BSDFFS       7               /* 4.2BSD fast filesystem */
   #define FS_MSDOS        8               /* MSDOS filesystem */
   #define FS_BSDLFS       9               /* 4.4BSD log-structured filesystem */
   #define FS_OTHER        10              /* in use, but unknown/unsupported */
   #define FS_HPFS         11              /* OS/2 high-performance filesystem */
   #define FS_ISO9660      12              /* ISO 9660, normally CD-ROM */
   #define FS_BOOT         13              /* partition contains bootstrap */
   #define FS_VINUM        14              /* Vinum drive */
   #define FS_RAID         15              /* RAIDFrame drive */
   #define FS_JFS2         21              /* IBM JFS2 */
   
   #ifdef  FSTYPENAMES
   static const char *fstypenames[] = {
           "unused",
           "swap",
           "Version 6",
           "Version 7",
           "System V",
           "4.1BSD",
           "Eighth Edition",
           "4.2BSD",
           "MSDOS",
           "4.4LFS",
           "unknown",
           "HPFS",
           "ISO9660",
           "boot",
           "vinum",
           "raid",
           "?",
           "?",
           "?",
           "?",
           "jfs",
           NULL
   };
   #define FSMAXTYPES      (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
   #endif
   
   /*
    * flags shared by various drives:
    */
   #define D_REMOVABLE     0x01            /* removable media */
   #define D_ECC           0x02            /* supports ECC */
   #define D_BADSECT       0x04            /* supports bad sector forw. */
   #define D_RAMDISK       0x08            /* disk emulator */
   #define D_CHAIN         0x10            /* can do back-back transfers */
   
   /*
    * Disklabel-specific ioctls.
    *
    * NB: <sys/disk.h> defines ioctls from 'd'/128 and up.
    */
                   /* get and set disklabel */
   #define DIOCGDINFO      _IOR('d', 101, struct disklabel)/* get */
   #define DIOCSDINFO      _IOW('d', 102, struct disklabel)/* set */
   #define DIOCWDINFO      _IOW('d', 103, struct disklabel)/* set, update disk */
   #define DIOCBSDBB       _IOW('d', 110, void *)  /* write bootblocks */
   
   /*
    * Functions for proper encoding/decoding of struct disklabel into/from
    * bytestring.
    */
   void bsd_partition_le_dec(u_char *ptr, struct partition *d);
   int bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart);
   void bsd_partition_le_enc(u_char *ptr, struct partition *d);
   void bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d);
   
   #ifndef _KERNEL
   __BEGIN_DECLS
   struct disklabel *getdiskbyname(const char *);
   __END_DECLS
   #endif
   
   #endif /* !_SYS_DISKLABEL_H_ */

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