geom_vinum_raid5.h

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    1 /*-
    2  * Copyright (c) 2004 Lukas Ertl
    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  * $FreeBSD$
   27  */
   28 
   29 #ifndef _GEOM_VINUM_RAID5_H_
   30 #define _GEOM_VINUM_RAID5_H_
   31 
   32 /*
   33  * A single RAID5 request usually needs more than one I/O transaction,
   34  * depending on the state of the associated subdisks and the direction of the
   35  * transaction (read or write).
   36  */
   37 
   38 #define GV_ENQUEUE(bp, cbp, pbp)                                \
   39         do {                                                    \
   40                 if (bp->bio_driver1 == NULL) {                  \
   41                         bp->bio_driver1 = cbp;                  \
   42                 } else {                                        \
   43                         pbp = bp->bio_driver1;                  \
   44                         while (pbp->bio_caller1 != NULL)        \
   45                                 pbp = pbp->bio_caller1;         \
   46                         pbp->bio_caller1 = cbp;                 \
   47                 }                                               \
   48         } while (0)
   49 
   50 struct gv_raid5_packet {
   51         caddr_t data;           /* Data buffer of this sub-request- */
   52         off_t   length;         /* Size of data buffer. */
   53         off_t   lockbase;       /* Deny access to our plex offset. */
   54         off_t   offset;         /* The drive offset of the subdisk. */
   55         int     bufmalloc;      /* Flag if data buffer was malloced. */
   56         int     active;         /* Count of active subrequests. */
   57         int     rqcount;        /* Count of subrequests. */
   58 
   59         struct bio      *bio;   /* Pointer to the original bio. */
   60         struct bio      *parity;  /* The bio containing the parity data. */
   61         struct bio      *waiting; /* A bio that need to wait for other bios. */
   62 
   63         TAILQ_HEAD(,gv_bioq)            bits; /* List of subrequests. */
   64         TAILQ_ENTRY(gv_raid5_packet)    list; /* Entry in plex's packet list. */
   65 };
   66 
   67 int     gv_stripe_active(struct gv_plex *, struct bio *);
   68 int     gv_build_raid5_req(struct gv_plex *, struct gv_raid5_packet *,
   69             struct bio *, caddr_t, off_t, off_t);
   70 int     gv_check_raid5(struct gv_plex *, struct gv_raid5_packet *,
   71             struct bio *, caddr_t, off_t, off_t);
   72 int     gv_rebuild_raid5(struct gv_plex *, struct gv_raid5_packet *,
   73             struct bio *, caddr_t, off_t, off_t);
   74 void    gv_raid5_worker(void *);
   75 void    gv_plex_done(struct bio *);
   76 
   77 #endif /* !_GEOM_VINUM_RAID5_H_ */

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

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sys/geom/vinum/geom_vinum_raid5.h