sys/sys/diskslice.h

   1 /*-
   2  * Copyright (c) 1994 Bruce D. Evans.
   3  * 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  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/sys/diskslice.h,v 1.36.2.1 2001/01/29 01:50:50 ken Exp $
  27  * $DragonFly: src/sys/sys/diskslice.h,v 1.6 2006/02/17 19:18:07 dillon Exp $
  28  */
  29
  30 #ifndef _SYS_DISKSLICE_H_
  31 #define _SYS_DISKSLICE_H_
  32
  33 #ifndef _KERNEL
  34 #include <sys/types.h>
  35 #endif
  36 #include <sys/ioccom.h>
  37
  38 #define BASE_SLICE              2
  39 #define COMPATIBILITY_SLICE     0
  40 #define DIOCGSLICEINFO          _IOR('d', 111, struct diskslices)
  41 #define DIOCSYNCSLICEINFO       _IOW('d', 112, int)
  42 #define MAX_SLICES              16
  43 #define WHOLE_DISK_SLICE        1
  44
  45 struct  diskslice {
  46         u_long  ds_offset;              /* starting sector */
  47         u_long  ds_size;                /* number of sectors */
  48         int     ds_type;                /* (foreign) slice type */
  49         struct disklabel *ds_label;     /* BSD label, if any */
  50         void    *ds_dev;                /* devfs token for raw whole slice */
  51 #ifdef MAXPARTITIONS                    /* XXX don't depend on disklabel.h */
  52 #if MAXPARTITIONS !=    16              /* but check consistency if possible */
  53 #error "inconsistent MAXPARTITIONS"
  54 #endif
  55 #else
  56 #define MAXPARTITIONS   16
  57 #endif
  58         void    *ds_devs[MAXPARTITIONS];        /* XXX s.b. in label */
  59         u_char  ds_openmask;            /* devs open */
  60         u_char  ds_wlabel;              /* nonzero if label is writable */
  61 };
  62
  63 struct diskslices {
  64         struct cdevsw *dss_cdevsw;      /* for containing device */
  65         int     dss_first_bsd_slice;    /* COMPATIBILITY_SLICE is mapped here */
  66         u_int   dss_nslices;            /* actual dimension of dss_slices[] */
  67         u_int   dss_oflags;             /* copy of flags for "first" open */
  68         int     dss_secmult;            /* block to sector multiplier */
  69         int     dss_secshift;           /* block to sector shift (or -1) */
  70         int     dss_secsize;            /* sector size */
  71         struct diskslice
  72                 dss_slices[MAX_SLICES]; /* actually usually less */
  73 };
  74
  75 #ifdef _KERNEL
  76
  77 /* Flags for dsopen(). */
  78 #define DSO_NOLABELS    1
  79 #define DSO_ONESLICE    2
  80 #define DSO_COMPATLABEL 4
  81
  82 #define dsgetlabel(dev, ssp)    (ssp->dss_slices[dkslice(dev)].ds_label)
  83
  84 struct buf;
  85 struct bio;
  86 struct disklabel;
  87
  88 struct bio *dscheck (dev_t dev, struct bio *bio, struct diskslices *ssp);
  89 void    dsclose (dev_t dev, int mode, struct diskslices *ssp);
  90 void    dsgone (struct diskslices **sspp);
  91 int     dsinit (dev_t dev, struct disklabel *lp,
  92                      struct diskslices **sspp);
  93 int     dsioctl (dev_t dev, u_long cmd, caddr_t data,
  94                      int flags, struct diskslices **sspp);
  95 int     dsisopen (struct diskslices *ssp);
  96 struct diskslices *dsmakeslicestruct (int nslices, struct disklabel *lp);
  97 char    *dsname (dev_t dev, int unit, int slice, int part,
  98                      char *partname);
  99 int     dsopen (dev_t dev, int mode, u_int flags,
 100                     struct diskslices **sspp, struct disklabel *lp);
 101 int     dssize (dev_t dev, struct diskslices **sspp);
 102
 103 #endif /* _KERNEL */
 104
 105 #endif /* !_SYS_DISKSLICE_H_ */