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

     /*
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This software was developed by the Computer Systems Engineering group
      * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      * contributed to Berkeley.
      *
      * All advertising materials mentioning features or use of this software
     * must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Lawrence Berkeley Laboratory.
     *
     * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      @(#)disk.h      8.1 (Berkeley) 6/2/93
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_DISK_H_
    #define _SYS_DISK_H_
    
    /*
     * Disk device structures.
     *
     * Note that this is only a preliminary outline.  The final disk structures
     * may be somewhat different.
     */
    struct buf;
    
    struct dkdevice {
            struct  device dk_dev;          /* base device */
            struct  dkdevice *dk_next;      /* list of disks; not yet used */
            int     dk_bps;                 /* xfer rate: bytes per second */
            int     dk_bopenmask;           /* block devices open */
            int     dk_copenmask;           /* character devices open */
            int     dk_openmask;            /* composite (bopen|copen) */
            int     dk_state;               /* label state   ### */
            int     dk_blkshift;            /* shift to convert DEV_BSIZE to blks */
            int     dk_byteshift;           /* shift to convert bytes to blks */
            struct  dkdriver *dk_driver;    /* pointer to driver */
            daddr_t dk_labelsector;         /* sector containing label */
            struct  disklabel dk_label;     /* label */
    };
    
    struct dkdriver {
            void    (*d_strategy) __P((struct buf *));
    #ifdef notyet
            int     (*d_open) __P((dev_t dev, int ifmt, int, struct proc *));
            int     (*d_close) __P((dev_t dev, int, int ifmt, struct proc *));
            int     (*d_ioctl) __P((dev_t dev, int cmd, caddr_t data, int fflag,
                                    struct proc *));
            int     (*d_dump) __P((dev_t));
            void    (*d_start) __P((struct buf *, daddr_t));
            int     (*d_mklabel) __P((struct dkdevice *));
    #endif
    };
    
    /* states */
    #define DK_CLOSED       0               /* drive is closed */
    #define DK_WANTOPEN     1               /* drive being opened */
    #define DK_WANTOPENRAW  2               /* drive being opened */
    #define DK_RDLABEL      3               /* label being read */
    #define DK_OPEN         4               /* label read, drive open */
    #define DK_OPENRAW      5               /* open without label */
    
    #ifdef DISKSORT_STATS
    /*
     * Stats from disksort().
     */
    struct disksort_stats {
            long    ds_newhead;             /* # new queue heads created */
           long    ds_newtail;             /* # new queue tails created */
           long    ds_midfirst;            /* # insertions into sort list */
           long    ds_endfirst;            /* # insertions at end of sort list */
           long    ds_newsecond;           /* # inversions (2nd lists) created */
           long    ds_midsecond;           /* # insertions into 2nd list */
           long    ds_endsecond;           /* # insertions at end of 2nd list */
   };
   #endif
   
   #ifdef KERNEL
   void    bufqdisksort __P((struct buf_queue_head *, struct buf *));
   char    *readdisklabel __P((struct dkdevice *, int));
   int     setdisklabel __P((struct dkdevice *, struct disklabel *));
   int     writedisklabel __P((struct dkdevice *, int));
   int     diskerr __P((struct dkdevice *, struct buf *, char *, int, int));
   #endif
   
   #endif

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