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: src/sys/sys/diskslice.h,v 1.16.2.1 1999/09/05 08:22:11 peter Exp $
   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 /* upcoming change from julian.. early warning of probable form */
   45 #if 1
   46 struct  diskslice {
   47         u_long  ds_offset;              /* starting sector */
   48         u_long  ds_size;                /* number of sectors */
   49         int     ds_type;                /* (foreign) slice type */
   50 #ifdef PC98
   51         int     ds_subtype;             /* sub slice type */
   52         u_char  ds_name[16];            /* slice name */
   53 #endif
   54         struct dkbad_intern *ds_bad;    /* bad sector table, if any */
   55         struct disklabel *ds_label;     /* BSD label, if any */
   56         void    *ds_bdev;               /* devfs token for whole slice */
   57         void    *ds_cdev;               /* devfs token for raw whole slice */
   58 #ifdef MAXPARTITIONS                    /* XXX don't depend on disklabel.h */
   59 #if MAXPARTITIONS !=    8               /* but check consistency if possible */
   60 #error "inconsistent MAXPARTITIONS"
   61 #endif
   62 #else
   63 #define MAXPARTITIONS   8
   64 #endif
   65         void    *ds_bdevs[MAXPARTITIONS];       /* XXX s.b. in label */
   66         void    *ds_cdevs[MAXPARTITIONS];       /* XXX s.b. in label */
   67         u_char  ds_bopenmask;           /* bdevs open */
   68         u_char  ds_copenmask;           /* cdevs open */
   69         u_char  ds_openmask;            /* [bc]devs open */
   70         u_char  ds_wlabel;              /* nonzero if label is writable */
   71 };
   72 
   73 #else
   74 /* switch table for slice handlers (sample only) */
   75 struct  slice_switch (
   76         int     (*slice_load)();
   77         int     (*slice_check();
   78         int     (*slice_gone)();
   79         /*
   80          * etc.
   81          * each  routine is called with the address of the private data
   82          * and the minor number..
   83          * Other arguments as needed
   84          */
   85 };
   86 
   87 struct  diskslice {
   88         u_long  ds_offset;              /* starting sector */
   89         u_long  ds_size;                /* number of sectors */
   90         int     ds_type;                /* (foreign) slice type */
   91 #ifdef PC98
   92         int     ds_subtype;             /* sub slice type */
   93         u_char  ds_name[16];            /* slice name */
   94 #endif
   95         struct dkbad_intern *ds_bad;    /* bad sector table, if any */
   96         void    *ds_date;               /* Slice type specific data */
   97         struct slice_switch *switch;    /* switch table for type handler */
   98         u_char  ds_bopenmask;           /* bdevs open */
   99         u_char  ds_copenmask;           /* cdevs open */
  100         u_char  ds_openmask;            /* [bc]devs open */
  101         u_char  ds_wlabel;              /* nonzero if label is writable */
  102 };
  103 #endif
  104 
  105 struct diskslices {
  106         struct bdevsw *dss_bdevsw;      /* for containing device */
  107         struct cdevsw *dss_cdevsw;      /* for containing device */
  108         int     dss_first_bsd_slice;    /* COMPATIBILITY_SLICE is mapped here */
  109         u_int   dss_nslices;            /* actual dimension of dss_slices[] */
  110         struct diskslice
  111                 dss_slices[MAX_SLICES]; /* actually usually less */
  112 };
  113 
  114 #ifdef KERNEL
  115 
  116 #define dsgetbad(dev, ssp)      (ssp->dss_slices[dkslice(dev)].ds_bad)
  117 #define dsgetlabel(dev, ssp)    (ssp->dss_slices[dkslice(dev)].ds_label)
  118 
  119 struct buf;
  120 struct disklabel;
  121 
  122 typedef int ds_setgeom_t __P((struct disklabel *lp));
  123 
  124 int     dscheck __P((struct buf *bp, struct diskslices *ssp));
  125 void    dsclose __P((dev_t dev, int mode, struct diskslices *ssp));
  126 void    dsgone __P((struct diskslices **sspp));
  127 int     dsinit __P((char *dname, dev_t dev, void (*strat)(struct buf *bp),
  128                     struct disklabel *lp, struct diskslices **sspp));
  129 int     dsioctl __P((char *dname, dev_t dev, int cmd, caddr_t data, int flags,
  130                      struct diskslices **sspp, void (*strat)(struct buf *bp),
  131                      ds_setgeom_t *setgeom));
  132 int     dsisopen __P((struct diskslices *ssp));
  133 char    *dsname __P((char *dname, int unit, int slice, int part,
  134                      char *partname));
  135 int     dsopen __P((char *dname, dev_t dev, int mode, struct diskslices **sspp,
  136                     struct disklabel *lp, void (*strat)(struct buf *bp),
  137                     ds_setgeom_t *setgeom, struct bdevsw *bdevsw,
  138                     struct cdevsw *cdevsw));
  139 int     dssize __P((dev_t dev, struct diskslices **sspp,
  140                     int (*dopen)(dev_t dev, int oflags, int devtype,
  141                                   struct proc *p),
  142                     int (*dclose)(dev_t dev, int fflag, int devtype,
  143                                    struct proc *p)));
  144 
  145 #endif /* KERNEL */
  146 
  147 #endif /* !_SYS_DISKSLICE_H_ */

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