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fdisklabel.h

/*
 * Copyright (c) 1987, 1988 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 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.
 */

#define BSD_DISKMAGIC     ((u_long) 0x82564557)
#define     BSD_MAXPARTITIONS 8
#define BSD_LINUX_BOOTDIR "/usr/ucb/mdec"

#if defined (i386)
#define BSD_LABELSECTOR   1
#define BSD_LABELOFFSET   0
#define     BSD_BBSIZE        8192        /* size of boot area, with label */
#define     BSD_SBSIZE        8192        /* max size of fs superblock */
#elif defined (__alpha__)
#error LABELSECTOR, LABELOFFSET, BBSIZE & SBSIZE are undefined for __alpha__
#define BSD_LABELSECTOR   0
#define BSD_LABELOFFSET   0
#define     BSD_BBSIZE        0
#define     BSD_SBSIZE        0
#elif defined (__powerpc__)
/* LABELSECTOR, LABELOFFSET, BBSIZE & SBSIZE are undefined for __powerpc__ */
#define BSD_LABELSECTOR   0
#define BSD_LABELOFFSET   0
#define     BSD_BBSIZE        0
#define     BSD_SBSIZE        0
#else
#error unknown architecture
#endif

struct disklabel {
      u_long      d_magic;          /* the magic number */
      short d_type;                 /* drive type */
      short d_subtype;        /* controller/d_type specific */
      char  d_typename[16];         /* type name, e.g. "eagle" */
      /* 
       * d_packname contains the pack identifier and is returned when
       * the disklabel is read off the disk or in-core copy.
       * d_boot0 and d_boot1 are the (optional) names of the
       * primary (block 0) and secondary (block 1-15) bootstraps
       * as found in /usr/mdec.  These are returned when using
       * getdiskbyname(3) to retrieve the values from /etc/disktab.
       */
#if defined(KERNEL) || defined(STANDALONE)
      char  d_packname[16];               /* pack identifier */ 
#else
      union {
            char  un_d_packname[16];      /* pack identifier */ 
            struct {
                  char *un_d_boot0; /* primary bootstrap name */
                  char *un_d_boot1; /* secondary bootstrap name */
            } un_b; 
      } d_un; 
#define d_packname      d_un.un_d_packname
#define d_boot0         d_un.un_b.un_d_boot0
#define d_boot1         d_un.un_b.un_d_boot1
#endif      /* ! KERNEL or STANDALONE */
                  /* disk geometry: */
      u_long      d_secsize;        /* # of bytes per sector */
      u_long      d_nsectors;       /* # of data sectors per track */
      u_long      d_ntracks;        /* # of tracks per cylinder */
      u_long      d_ncylinders;           /* # of data cylinders per unit */
      u_long      d_secpercyl;            /* # of data sectors per cylinder */
      u_long      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_short     d_sparespertrack; /* # of spare sectors per track */
      u_short     d_sparespercyl;         /* # of spare sectors per cylinder */
      /*
       * Alternate cylinders include maintenance, replacement,
       * configuration description areas, etc.
       */
      u_long      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_short     d_rpm;                  /* rotational speed */
      u_short     d_interleave;           /* hardware sector interleave */
      u_short     d_trackskew;            /* sector 0 skew, per track */
      u_short     d_cylskew;        /* sector 0 skew, per cylinder */
      u_long      d_headswitch;           /* head switch time, usec */
      u_long      d_trkseek;        /* track-to-track seek, usec */
      u_long      d_flags;          /* generic flags */
#define NDDATA 5
      u_long      d_drivedata[NDDATA];    /* drive-type specific information */
#define NSPARE 5
      u_long      d_spare[NSPARE];  /* reserved for future use */
      u_long      d_magic2;         /* the magic number (again) */
      u_short     d_checksum;       /* xor of data incl. partitions */
                  /* filesystem and partition information: */
      u_short     d_npartitions;            /* number of partitions in following */
      u_long      d_bbsize;           /* size of boot area at sn0, bytes */
      u_long      d_sbsize;           /* max size of fs superblock, bytes */
      struct bsd_partition {          /* the partition table */
            u_long      p_size;             /* number of sectors in partition */
            u_long      p_offset;       /* starting sector */
            u_long      p_fsize;        /* filesystem basic fragment size */
            u_char      p_fstype;       /* filesystem type, see below */
            u_char      p_frag;             /* filesystem fragments per block */
            u_short     p_cpg;              /* filesystem cylinders per group */
      } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
};

/* d_type values: */
#define     BSD_DTYPE_SMD           1           /* SMD, XSMD; VAX hp/up */
#define     BSD_DTYPE_MSCP          2           /* MSCP */
#define     BSD_DTYPE_DEC           3           /* other DEC (rk, rl) */
#define     BSD_DTYPE_SCSI          4           /* SCSI */
#define     BSD_DTYPE_ESDI          5           /* ESDI interface */
#define     BSD_DTYPE_ST506         6           /* ST506 etc. */
#define     BSD_DTYPE_HPIB          7           /* CS/80 on HP-IB */
#define BSD_DTYPE_HPFL        8           /* HP Fiber-link */
#define     BSD_DTYPE_FLOPPY  10          /* floppy */

/* d_subtype values: */
#define BSD_DSTYPE_INDOSPART  0x8         /* is inside dos partition */
#define BSD_DSTYPE_DOSPART(s) ((s) & 3)   /* dos partition number */
#define BSD_DSTYPE_GEOMETRY   0x10        /* drive params in label */

#ifdef DKTYPENAMES
static char *bsd_dktypenames[] = {
      "unknown",
      "SMD",
      "MSCP",
      "old DEC",
      "SCSI",
      "ESDI",
      "ST506",
      "HP-IB",
      "HP-FL",
      "type 9",
      "floppy",
      0
};
#define BSD_DKMAXTYPES  (sizeof(bsd_dktypenames) / sizeof(bsd_dktypenames[0]) - 1)
#endif

/*
 * Filesystem type and version.
 * Used to interpret other filesystem-specific
 * per-partition information.
 */
#define     BSD_FS_UNUSED     0           /* unused */
#define     BSD_FS_SWAP       1           /* swap */
#define     BSD_FS_V6         2           /* Sixth Edition */
#define     BSD_FS_V7         3           /* Seventh Edition */
#define     BSD_FS_SYSV       4           /* System V */
#define     BSD_FS_V71K       5           /* V7 with 1K blocks (4.1, 2.9) */
#define     BSD_FS_V8         6           /* Eighth Edition, 4K blocks */
#define     BSD_FS_BSDFFS     7           /* 4.2BSD fast file system */
#define     BSD_FS_MSDOS      8           /* MS-DOS file system */
#define     BSD_FS_BSDLFS     9           /* 4.4BSD log-structured file system */
#define     BSD_FS_OTHER      10          /* in use, but unknown/unsupported */
#define     BSD_FS_HPFS 11          /* OS/2 high-performance file system */
#define     BSD_FS_ISO9660    12          /* ISO-9660 filesystem (cdrom) */
#define BSD_FS_ISOFS    BSD_FS_ISO9660
#define     BSD_FS_BOOT 13          /* partition contains bootstrap */
#define BSD_FS_ADOS     14          /* AmigaDOS fast file system */
#define BSD_FS_HFS      15          /* Macintosh HFS */

#ifdef      DKTYPENAMES
static struct systypes bsd_fstypes[] = {
        {BSD_FS_UNUSED, "unused"},
      {BSD_FS_SWAP,   "swap"},
      {BSD_FS_V6,     "Version 6"},
      {BSD_FS_V7,     "Version 7"},
      {BSD_FS_SYSV,   "System V"},
      {BSD_FS_V71K,   "4.1BSD"},
      {BSD_FS_V8,     "Eighth Edition"},
      {BSD_FS_BSDFFS, "4.2BSD"},
      {BSD_FS_MSDOS,  "MS-DOS"},
      {BSD_FS_BSDLFS, "4.4LFS"},
      {BSD_FS_OTHER,  "unknown"},
      {BSD_FS_HPFS,   "HPFS"},
      {BSD_FS_ISO9660,"ISO-9660"},
      {BSD_FS_BOOT,   "boot"},
      {BSD_FS_ADOS,   "ADOS"},
      {BSD_FS_HFS,    "HFS"}
};

#define BSD_FSMAXTYPES  (sizeof(bsd_fstypes) / sizeof(struct systypes))
#endif

/*
 * flags shared by various drives:
 */
#define     BSD_D_REMOVABLE   0x01        /* removable media */
#define     BSD_D_ECC         0x02        /* supports ECC */
#define     BSD_D_BADSECT     0x04        /* supports bad sector forw. */
#define     BSD_D_RAMDISK     0x08        /* disk emulator */
#define     BSD_D_CHAIN       0x10        /* can do back-back transfers */
#define     BSD_D_DOSPART     0x20        /* within MSDOS partition */

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