FreeBSD/Linux Kernel Cross Reference
sys/dev/dkvar.h

     /* $NetBSD: dkvar.h,v 1.13 2008/04/28 20:23:46 martin Exp $ */
     
     /*-
      * Copyright (c) 2002 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Roland C. Dowdeswell.
      *
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    struct dk_geom {
            u_int32_t       pdg_secsize;
            u_int32_t       pdg_nsectors;
            u_int32_t       pdg_ntracks;
            u_int32_t       pdg_ncylinders;
    };
    
    /* literally this is not a softc, but is intended to be included in
     * the pseudo-disk's softc and passed to calls in dksubr.c.  It
     * should include the common elements of the pseudo-disk's softc.
     * All elements that are included here should describe the external
     * representation of the disk to the higher layers, and flags that
     * are common to each of the pseudo-disk drivers.
     */
    struct dk_softc {
            void                    *sc_osc;        /* the softc of the underlying
                                                     * driver */
            u_int32_t                sc_flags;      /* flags */
            size_t                   sc_size;       /* size of disk */
            struct dk_geom           sc_geom;       /* geometry info */
    #define DK_XNAME_SIZE 8
            char                     sc_xname[DK_XNAME_SIZE]; /* external name */
            struct disk              sc_dkdev;      /* generic disk info */
            struct bufq_state       *sc_bufq;       /* buffer queue */
    };
    
    /* sc_flags:
     *   We separate the flags into two varieties, those that dksubr.c
     *   understands and manipulates and those that it does not.
     */
    
    #define DKF_INITED      0x00010000 /* unit has been initialised */
    #define DKF_WLABEL      0x00020000 /* label area is writable */
    #define DKF_LABELLING   0x00040000 /* unit is currently being labeled */
    #define DKF_WARNLABEL   0x00080000 /* warn if disklabel not present */
    #define DKF_LABELSANITY 0x00100000 /* warn if disklabel not sane */
    #define DKF_TAKEDUMP    0x00200000 /* allow dumping */
    
    /* Mask of flags that dksubr.c understands, other flags are fair game */
    #define DK_FLAGMASK     0xffff0000
    
    /*
     * This defines the interface to the routines in dksubr.c.  This
     * should be a single static structure per pseudo-disk driver.
     * We only define the functions that we currently need.
     */
    struct dk_intf {
            int       di_dtype;                     /* disk type */
            const char *di_dkname;                  /* disk type name */
            int     (*di_open)(dev_t, int, int, struct lwp *);
            int     (*di_close)(dev_t, int, int, struct lwp *);
            void    (*di_strategy)(struct buf *);
            int     (*di_diskstart)(struct dk_softc *, struct buf *);
    };
    
    #define DK_BUSY(_dksc, _pmask)                          \
            ((_dksc)->sc_dkdev.dk_openmask & ~(_pmask)) ||  \
            ((_dksc)->sc_dkdev.dk_bopenmask & (_pmask)  &&  \
            ((_dksc)->sc_dkdev.dk_copenmask & (_pmask)))
    
    /*
     * Functions that are exported to the pseudo disk implementations:
     */
    
    void    dk_sc_init(struct dk_softc *, void *, const char *);
    
    int     dk_open(struct dk_intf *, struct dk_softc *, dev_t,
                    int, int, struct lwp *);
   int     dk_close(struct dk_intf *, struct dk_softc *, dev_t,
                    int, int, struct lwp *);
   void    dk_strategy(struct dk_intf *, struct dk_softc *, struct buf *);
   void    dk_start(struct dk_intf *, struct dk_softc *);
   void    dk_iodone(struct dk_intf *, struct dk_softc *);
   int     dk_size(struct dk_intf *, struct dk_softc *, dev_t);
   int     dk_ioctl(struct dk_intf *, struct dk_softc *, dev_t,
                    u_long, void *, int, struct lwp *);
   int     dk_dump(struct dk_intf *, struct dk_softc *, dev_t,
                   daddr_t, void *, size_t);
   void    dk_getdisklabel(struct dk_intf *, struct dk_softc *, dev_t);
   void    dk_getdefaultlabel(struct dk_intf *, struct dk_softc *,
                              struct disklabel *);
   
   int     dk_lookup(const char *, struct lwp *, struct vnode **, enum uio_seg);

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