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/dev/dkvar.h

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    1 /* $NetBSD: dkvar.h,v 1.4 2004/03/27 23:23:06 elric Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Roland C. Dowdeswell.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 struct dk_geom {
   40         u_int32_t       pdg_secsize;
   41         u_int32_t       pdg_nsectors;
   42         u_int32_t       pdg_ntracks;
   43         u_int32_t       pdg_ncylinders;
   44 };
   45 
   46 /* literally this is not a softc, but is intended to be included in
   47  * the pseudo-disk's softc and passed to calls in dksubr.c.  It
   48  * should include the common elements of the pseudo-disk's softc.
   49  * All elements that are included here should describe the external
   50  * representation of the disk to the higher layers, and flags that
   51  * are common to each of the pseudo-disk drivers.
   52  */
   53 struct dk_softc {
   54         void                    *sc_osc;        /* the softc of the underlying
   55                                                  * driver */
   56         u_int32_t                sc_flags;      /* flags */
   57         size_t                   sc_size;       /* size of disk */
   58         struct dk_geom           sc_geom;       /* geometry info */
   59 #define DK_XNAME_SIZE 8
   60         char                     sc_xname[DK_XNAME_SIZE]; /* external name */
   61         struct disk              sc_dkdev;      /* generic disk info */
   62         struct lock              sc_lock;       /* the lock */
   63         struct bufq_state        sc_bufq;       /* buffer queue */
   64 };
   65 
   66 /* sc_flags:
   67  *   We separate the flags into two varieties, those that dksubr.c
   68  *   understands and manipulates and those that it does not.
   69  */
   70 
   71 #define DKF_INITED      0x00010000 /* unit has been initialised */
   72 #define DKF_WLABEL      0x00020000 /* label area is writable */
   73 #define DKF_LABELLING   0x00040000 /* unit is currently being labeled */
   74 #define DKF_WARNLABEL   0x00080000 /* warn if disklabel not present */
   75 #define DKF_LABELSANITY 0x00100000 /* warn if disklabel not sane */
   76 #define DKF_TAKEDUMP    0x00200000 /* allow dumping */
   77 
   78 /* Mask of flags that dksubr.c understands, other flags are fair game */
   79 #define DK_FLAGMASK     0xffff0000
   80 
   81 /*
   82  * This defines the interface to the routines in dksubr.c.  This
   83  * should be a single static structure per pseudo-disk driver.
   84  * We only define the functions that we currently need.
   85  */
   86 struct dk_intf {
   87         int       di_dtype;                     /* disk type */
   88         char     *di_dkname;                    /* disk type name */
   89         int     (*di_open)(dev_t, int, int, struct proc *);
   90         int     (*di_close)(dev_t, int, int, struct proc *);
   91         void    (*di_strategy)(struct buf *);
   92         int     (*di_diskstart)(struct dk_softc *, struct buf *);
   93 };
   94 
   95 #define DK_BUSY(_dksc, _pmask)                          \
   96         ((_dksc)->sc_dkdev.dk_openmask & ~(_pmask)) ||  \
   97         ((_dksc)->sc_dkdev.dk_bopenmask & (_pmask)  &&  \
   98         ((_dksc)->sc_dkdev.dk_copenmask & (_pmask)))
   99 
  100 /*
  101  * Functions that are exported to the pseudo disk implementations:
  102  */
  103 
  104 void    dk_sc_init(struct dk_softc *, void *, char *);
  105 
  106 int     dk_open(struct dk_intf *, struct dk_softc *, dev_t,
  107                 int, int, struct proc *);
  108 int     dk_close(struct dk_intf *, struct dk_softc *, dev_t,
  109                  int, int, struct proc *);
  110 void    dk_strategy(struct dk_intf *, struct dk_softc *, struct buf *);
  111 void    dk_start(struct dk_intf *, struct dk_softc *);
  112 void    dk_iodone(struct dk_intf *, struct dk_softc *);
  113 int     dk_size(struct dk_intf *, struct dk_softc *, dev_t);
  114 int     dk_ioctl(struct dk_intf *, struct dk_softc *, dev_t,
  115                  u_long, caddr_t, int, struct proc *);
  116 int     dk_dump(struct dk_intf *, struct dk_softc *, dev_t,
  117                 daddr_t, caddr_t, size_t);
  118 void    dk_getdisklabel(struct dk_intf *, struct dk_softc *, dev_t);
  119 void    dk_getdefaultlabel(struct dk_intf *, struct dk_softc *,
  120                            struct disklabel *);
  121 
  122 int     dk_lookup(char *, struct proc *, struct vnode **);

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