FreeBSD/Linux Kernel Cross Reference
sys/geom/vinum/geom_vinum_raid5.h

     /*-
      * Copyright (c) 2004, 2007 Lukas Ertl
      * All rights reserved.
      *
      * 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 AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD: releng/8.3/sys/geom/vinum/geom_vinum_raid5.h 190507 2009-03-28 17:20:08Z lulf $
     */
    
    #ifndef _GEOM_VINUM_RAID5_H_
    #define _GEOM_VINUM_RAID5_H_
    
    /*
     * A single RAID5 request usually needs more than one I/O transaction,
     * depending on the state of the associated subdisks and the direction of the
     * transaction (read or write).
     */
    
    struct gv_raid5_packet {
            caddr_t data;           /* Data buffer of this sub-request- */
            off_t   length;         /* Size of data buffer. */
            off_t   lockbase;       /* Deny access to our plex offset. */
    
            struct bio      *bio;   /* Pointer to the original bio. */
            struct bio      *parity;  /* The bio containing the parity data. */
            struct bio      *waiting; /* A bio that need to wait for other bios. */
    
            TAILQ_HEAD(,gv_bioq)            bits; /* List of subrequests. */
            TAILQ_ENTRY(gv_raid5_packet)    list; /* Entry in plex's packet list. */
    };
    
    struct gv_raid5_packet * gv_raid5_start(struct gv_plex *, struct bio *,
                    caddr_t, off_t, off_t);
    int     gv_stripe_active(struct gv_plex *, struct bio *);
    
    #endif /* !_GEOM_VINUM_RAID5_H_ */

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