The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    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  * $FreeBSD$
   27  */
   28 
   29 #ifndef _SYS_DISKSLICE_H_
   30 #define _SYS_DISKSLICE_H_
   31 
   32 #ifndef _KERNEL
   33 #include <sys/types.h>
   34 #endif
   35 #include <sys/ioccom.h>
   36 
   37 #define BASE_SLICE              2
   38 #define COMPATIBILITY_SLICE     0
   39 #define DIOCGSLICEINFO          _IOR('d', 111, struct diskslices)
   40 #define DIOCSYNCSLICEINFO       _IOW('d', 112, int)
   41 #define MAX_SLICES              32
   42 #define WHOLE_DISK_SLICE        1
   43 
   44 struct  diskslice {
   45         u_long  ds_offset;              /* starting sector */
   46         u_long  ds_size;                /* number of sectors */
   47         int     ds_type;                /* (foreign) slice type */
   48 #ifdef PC98
   49         int     ds_subtype;             /* sub slice type */
   50         u_char  ds_name[16];            /* slice name */
   51 #endif
   52         struct disklabel *ds_label;     /* BSD label, if any */
   53         void    *ds_dev;                /* devfs token for raw whole slice */
   54 #ifdef MAXPARTITIONS                    /* XXX don't depend on disklabel.h */
   55 #if MAXPARTITIONS !=    8               /* but check consistency if possible */
   56 #error "inconsistent MAXPARTITIONS"
   57 #endif
   58 #else
   59 #define MAXPARTITIONS   8
   60 #endif
   61         void    *ds_devs[MAXPARTITIONS];        /* XXX s.b. in label */
   62         u_char  ds_openmask;            /* devs open */
   63         u_char  ds_wlabel;              /* nonzero if label is writable */
   64 };
   65 
   66 struct diskslices {
   67         struct cdevsw *dss_cdevsw;      /* for containing device */
   68         int     dss_first_bsd_slice;    /* COMPATIBILITY_SLICE is mapped here */
   69         u_int   dss_nslices;            /* actual dimension of dss_slices[] */
   70         u_int   dss_oflags;             /* copy of flags for "first" open */
   71         int     dss_secmult;            /* block to sector multiplier */
   72         int     dss_secshift;           /* block to sector shift (or -1) */
   73         int     dss_secsize;            /* sector size */
   74         struct diskslice
   75                 dss_slices[MAX_SLICES]; /* actually usually less */
   76 };
   77 
   78 #ifdef _KERNEL
   79 
   80 /* Flags for dsopen(). */
   81 #define DSO_NOLABELS    1
   82 #define DSO_ONESLICE    2
   83 #define DSO_COMPATLABEL 4
   84 
   85 #define dsgetlabel(dev, ssp)    (ssp->dss_slices[dkslice(dev)].ds_label)
   86 
   87 struct buf;
   88 struct disklabel;
   89 
   90 int     dscheck __P((struct buf *bp, struct diskslices *ssp));
   91 void    dsclose __P((dev_t dev, int mode, struct diskslices *ssp));
   92 void    dsgone __P((struct diskslices **sspp));
   93 int     dsinit __P((dev_t dev, struct disklabel *lp,
   94                      struct diskslices **sspp));
   95 int     dsioctl __P((dev_t dev, u_long cmd, caddr_t data,
   96                      int flags, struct diskslices **sspp));
   97 int     dsisopen __P((struct diskslices *ssp));
   98 struct diskslices *dsmakeslicestruct __P((int nslices, struct disklabel *lp));
   99 char    *dsname __P((dev_t dev, int unit, int slice, int part,
  100                      char *partname));
  101 int     dsopen __P((dev_t dev, int mode, u_int flags,
  102                     struct diskslices **sspp, struct disklabel *lp));
  103 int     dssize __P((dev_t dev, struct diskslices **sspp));
  104 
  105 #endif /* _KERNEL */
  106 
  107 #endif /* !_SYS_DISKSLICE_H_ */

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