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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 1.108.2.2.4.1 2009/04/15 03:14:26 kensmith Exp $
 */

#ifndef _SYS_DISKLABEL_H_
#define     _SYS_DISKLABEL_H_

#ifndef _KERNEL
#include <sys/types.h>
#endif
#include <stddef.h>
#include <sys/ioctl.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(__arm__) || \
    defined(__ia64__)
#define LABELSECTOR     1                 /* sector containing label */
#define LABELOFFSET     0                 /* offset of label in sector */
#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 */

00073 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 */
00138       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_FILECORE 16          /* Acorn Filecore Filing System */
#define     FS_EXT2FS   17          /* ext2fs */
#define     FS_NTFS           18          /* Windows/NT file system */
#define     FS_CCD            20          /* concatenated disk component */
#define     FS_JFS2           21          /* IBM JFS2 */
#define     FS_UDF            24          /* UDF */
#define     FS_EFS            26          /* SGI's Extent File system */
#define     FS_ZFS            27          /* Sun's ZFS */

#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",
      "Filecore",
      "EXT2FS",
      "NTFS",
      "?",
      "ccd",
      "jfs",
      "?",
      "?",
      "UDF",
      "?",
      "EFS",
      "ZFS",
      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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